US20120152248A1 - Apparatus for compressing and storing oxygen enriched gas - Google Patents
Apparatus for compressing and storing oxygen enriched gas Download PDFInfo
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- US20120152248A1 US20120152248A1 US13/404,848 US201213404848A US2012152248A1 US 20120152248 A1 US20120152248 A1 US 20120152248A1 US 201213404848 A US201213404848 A US 201213404848A US 2012152248 A1 US2012152248 A1 US 2012152248A1
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- oxygen
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- compressor
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B7/00—Respiratory apparatus
- A62B7/14—Respiratory apparatus for high-altitude aircraft
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M16/101—Preparation of respiratory gases or vapours with O2 features or with parameter measurement using an oxygen concentrator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B25/00—Multi-stage pumps
- F04B25/02—Multi-stage pumps of stepped piston type
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
- A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
- A61M16/10—Preparation of respiratory gases or vapours
- A61M16/1005—Preparation of respiratory gases or vapours with O2 features or with parameter measurement
- A61M2016/102—Measuring a parameter of the content of the delivered gas
- A61M2016/1025—Measuring a parameter of the content of the delivered gas the O2 concentration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2256/00—Main component in the product gas stream after treatment
- B01D2256/12—Oxygen
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4533—Gas separation or purification devices adapted for specific applications for medical purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/4541—Gas separation or purification devices adapted for specific applications for portable use, e.g. gas masks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
- B01D53/0446—Means for feeding or distributing gases
Definitions
- the present invention relates to an apparatus and process for conserving enriched oxygen which is subsequently collected under high pressure in a portable container for ambulatory patient use and to permit facile patient mobility.
- a multi-stage radial compressor is utilized to pressurize the desired gas.
- the enriched oxygen is fed at a reduced pressure from a product storage tank to a patient, and at the storage tank pressure to generally a buffer tank and subsequently to a radial compressor.
- oxygen concentrators have been utilized to supply patients with a gas having a high oxygen concentration for extended periods of time.
- Oxygen concentrators typically produce a breathable gas containing from about 80 percent to about 96 percent oxygen from atmospheric air and thus have been widely utilized in the home health care field.
- U.S. Pat. No. 4,627,860, to Rowland relates to a microprocessor and cooperating means for monitoring or sensing functions and performance of various components of the concentrator.
- a test apparatus having means for selecting any of the functions monitored by the microprocessor is connected to the concentrator and displays the selected monitored functions for diagnosing performance levels and component problems or failures.
- U.S. Pat. No. 5,071,453, to Hradek et al. relates to an oxygen concentrator which is intended for aircraft use.
- a booster compressor is used to increase the pressure of the product gas from the concentrator in order to increase the amount of the gas which can be stored in a plenum.
- the booster includes two moving pistons which are rigidly linked together and a series of check valves which control the flow of gases through the compressor.
- One of the pistons is driven by air from the rotary valve in the concentrator, and the other piston compresses the product gas for delivery to the plenum.
- a small sample of concentrator product gas is monitored by an oxygen sensor for oxygen concentration. Once the oxygen concentration has reached an acceptable level, the booster compressor fills the plenum with product gas.
- the oxygen sensor monitors the concentrator output product gas to the breathing regulator when the stored plenum gas is not being used.
- U.S. Pat. No. 5,354,361 to Coffield, relates to a pressure-swing adsorber system including a pneumatically driven booster compressor to increase the pressure of the output product gas.
- a pair of inlet valves controls feed air flow to the sieve beds and the drive cylinder of the booster compressor and are cycled so that one valve opens to pressurize one sieve bed before the other valve closes to allow the other sieve bed to vent to atmosphere.
- the pressure in the two sieve beds and on opposite sides of the drive cylinder equalize and a portion of the gas in the pressurized sieve bed and drive cylinder side is captured rather than being vented to ambient.
- System efficiency is increased by selecting whether captured gas from the last pressurized sieve bed or drive cylinder side reaches the next to be pressurized sieve bed first.
- U.S. Pat. No. 5,858,062 assigned to Litton Systems, Inc., relates to an apparatus for providing oxygen-enriched air at a first pressure and at a second pressure, the second pressure being greater than the first pressure.
- the apparatus comprises, in combination, a pressure swing adsorption system and a pressure intensifier.
- the pressure swing adsorption system for enriching the oxygen content of air has a pressure of at least the first pressure.
- the pressure swing adsorption system is adapted to provide oxygen-enriched air to a first outlet at the first pressure and to provide oxygen-enriched air to a pressure intensifier at the first pressure.
- the pressure intensifier pressurizes the oxygen-enriched air and provides the oxygen-enriched air to a second outlet at the second pressure.
- a method and apparatus for producing from air an oxygen-enriched gas and initially storing the same in a concentrator product tank At least a portion of the oxygen-enriched gas is fed by different methods as to an optional but desired compressor buffer tank where it is stored. After reaching a predetermined pressure, the gas is fed to a compressor where it is compressed to a high pressure and stored in a mobile or portable high-pressure container.
- a patient can thus have increased mobility through use of the portable, one or more high-pressure oxygen containers, which can be filled in one's own home.
- the excess gas when available, is simultaneously delivered to an independent, multi-stage compressor.
- a home health care oxygen concentrator for physically separating molecules of oxygen from air with oxygen in a subsequent operation being fed to a high-pressure vessel.
- the concentrator comprises one or more molecular sieve beds containing a physical separation material, a first (i.e., feed stock) compressor to provide a feed source of compressed air, control means which regulate the product gas flow through the beds to a concentrator product tank, a second enriched-gas storage tank (e.g., a buffer tank), and a second compressor, e.g., multi-stage, which is not operated by the first compressor but operates independently thereof and enables the oxygen-enriched gas to be compressed and fed to a high-pressure vessel or container.
- a first (i.e., feed stock) compressor to provide a feed source of compressed air
- control means which regulate the product gas flow through the beds to a concentrator product tank
- a second enriched-gas storage tank e.g., a buffer tank
- a second compressor e.g., multi-stage
- a radial compressor can be utilized to compress oxygen from an optional but desired buffer tank connected to an oxygen source.
- the radial compressor has pistons radially arranged around a central drive shaft and compresses the oxygen to a high pressure and stores the same in a compact storage cylinder.
- This design is more compact and less bulky than typical linear designed compressors, and allows the compressor to be housed in a relatively small unit which is thus more easily transportable.
- An oxygen sensor determines whether a required minimum oxygen concentration is being supplied to a patient and if not, terminates the flow of compressed oxygen to the cylinder, while maintaining the flow to the patient.
- Still another embodiment relates to an oxygen storage tank which operatively feeds oxygen-enriched gas to a patient and which also independently and operatively feeds enriched oxygen at a different and generally greater pressure to a buffer tank where subsequently it is compressed by a compressor, independent of an initial compressor for feeding air to the molecular sieves.
- FIG. 1 is a block diagram of an oxygen concentrator for separating oxygen from a gaseous mixture such as air;
- FIG. 2 is a block diagram of an apparatus and process in accordance with the present invention for compressing oxygen-enriched air and feeding it to a portable container;
- FIG. 3 is a block diagram of the apparatus and process of the present invention for feeding a portion of enriched gas at a controlled rate to a patient and another portion of the enriched gas to a compressor for high-pressure storage in a portable container;
- FIG. 4 is a block diagram of the apparatus and process of another embodiment of the present invention for feeding a portion of enriched gas at a controlled rate to a patient and another portion of the enriched gas to a compressor for high-pressure storage in a portable container;
- FIG. 5 is a schematic showing one portion of a control circuit for operating a multi-stage compressor of the present invention
- FIG. 6 is a schematic of the remaining portion of the control circuit of FIG. 5 for operating a multi-stage compressor of the present invention
- FIG. 7 is a side elevational view of the compression apparatus of the present invention.
- FIG. 8 is a top plan view of the compression apparatus of the present invention.
- FIG. 9 is a side elevational view of the upper portion of the two-part piston assembly of the present invention.
- FIG. 10 is a side elevational view of the bottom portion of the two-part piston assembly of the present invention.
- FIG. 11 is a top plan view of a radial compressor of the present invention.
- FIG. 12 is a perspective view of the radial compressor of FIG. 11 showing inlet and outlet connections of the compression cylinders;
- FIG. 13 is a perspective view of the portable high pressure oxygen conserving device of the present invention.
- FIG. 14 is a mechanical and quasi-electrical schematic of the radial compressor and the flow system of the present invention.
- FIG. 15 is a block diagram of the electrical circuitry of the invention including an oxygen concentration test mode aspect
- FIG. 16 is a block diagram of the apparatus and process of the preferred embodiment showing the general flow at different pressures of oxygen-enriched gas from an oxygen or product storage tank to a patient as well as to eventually a compressor for compression and delivery to a high pressure, portable, storage cylinder;
- FIG. 17 is a detailed view of the embodiment shown in FIG. 16 , including the buffer tank, compressor and high pressure cylinder;
- FIG. 18 is a detailed view of the embodiment shown in FIG. 16 , including a controller apparatus;
- FIG. 19 is a top plan view of an alternate embodiment compressor apparatus of the present invention.
- FIG. 20 is a front elevational view of the alternative compression apparatus shown in FIG. 19 ;
- FIG. 21 is a rear elevation view of the alternative compression apparatus shown in FIG. 19 ;
- FIG. 22A is a partial plan view of a first piston of the present invention.
- FIG. 22B is an enlarged partial elevation view of the second piston of the present invention.
- FIG. 22C is an enlarged partial elevation view of the third piston of the present invention.
- FIG. 23 is an electrical schematic of the various circuits for controlling the compact compressor.
- the apparatus includes one or more, and preferably two beds 10 and 12 which contain a physical separation medium or material.
- the separation material selectively adsorbs one or more adsorbable components as from air and passes one or more nonadsorbable components of such a gaseous mixture.
- the physical separation material can be a molecular sieve with pores of uniform size and essentially the same molecular dimensions. These pores selectively adsorb molecules in accordance with molecular shape, polarity, degree of saturation, and the like.
- the physical separation medium is an aluminasilicate composition with 4 to 5 A (Angstrom) pores.
- the molecular sieve is a sodium or calcium form of aluminasilicate, such as type 5A zeolite.
- the aluminasilicate may have a higher silicon-to-aluminum ratio, larger pores, and an affinity for polar molecules, e.g., type 13.times. zeolite.
- the zeolite adsorbs nitrogen, carbon monoxide, carbon dioxide, water vapor, and other significant components of air.
- a cross-over valving means 20 which preferably includes a four-way valve 21 , selectively and cyclically connects the inlet end of two beds, one at a time, during a production phase with a source of the gas mixture, e.g., air under pressure supplied from a first compressor 22 (i.e., the feed compressor), while the other bed is vented to atmosphere during a purge phase.
- a source of the gas mixture e.g., air under pressure supplied from a first compressor 22 (i.e., the feed compressor)
- the cross-over valving means selectively connects one of the beds in fluid communication with an air pump or compressor 22 which supplies air from about 15 to about 21 psi.
- fluid communication refers to means allowing flow of the appropriate gases.
- vacuum can also be used during the purge phase with the present invention to enhance evacuation.
- Compressor 22 which receives air from inlet 23 , is connected to a first drive motor 25 , in the preferred embodiment about a 1 ⁇ 4-horsepower electric motor.
- a solenoid (not shown) or other cross-over valve actuating means selectively causes the cross-over valving means to move alternately between first and second positions.
- the first position the first bed 10 is connected with compressor 22 to cause nitrogen adsorption and oxygen enrichment in the product gas, and the second bed 12 is vented to atmosphere to allow evacuation.
- the first bed In the second position, the first bed is vented to atmosphere to allow evacuation and the second bed is connected with the air compressor to cause nitrogen adsorption.
- the invention is described with specific reference to a pressure-swing control. However, it is equally applicable to other methods of sequencing the gas flow through the sieve beds such as a timing-based system.
- the composition of the gas in the voids of the zeolite varies from substantially pure primary-product gas at the outlet end, to the ambient gaseous mixture composition at the inlet end.
- an adsorption zone of finite, relatively large size is formed as the gas mixture is introduced through a bed inlet to an adsorbed, gas-free or regenerated bed.
- This adsorption zone is a region of the bed in which the full capacity of the adsorbent to hold the adsorbable components has not been reached.
- This adsorption zone moves from the bed inlet toward a bed outlet with a velocity significantly less than the superficial gas velocity in the bed.
- the breakthrough is defined by the size and configuration of the bed container as well as the packing configuration of the molecular sieve and the flow rate and bed gas pressure.
- the configuration of the bed is generally cylindrical and the output volume rate can vary from about 0.1 to 6 liters per minute.
- the breakthrough is the time required for the diffusion reaction as the nitrogen saturates and is weakly bonded to the sieve bed.
- primary product-enriched bed gas in the zeolite voids varies from a higher primary product gas concentration at the bed outlet to a lower concentration at the bed inlet.
- the primary product-enriched bed gas is about 80 percent primary product at breakthrough. While adsorption is occurring in one bed, the adsorbable components adsorbed by the separation medium of the other bed are purged from the other bed because of the drop in pressure due to atmospheric venting and because of exposure to relatively pure product gas from the first tank.
- the first bed 10 is connected with a reservoir or product tank 30 by way of a first check valve 32 or other unidirectional valving means.
- the first check valve 32 permits the primary product gas from the first bed 10 to flow into the reservoir or product tank 30 via line 46 when the product gas pressure in the first bed 10 exceeds the pressure of product gas in the reservoir or product tank 30 .
- the first check valve prohibits the product gas from flowing from the reservoir or product tank 30 when the pressure in the first bed 10 is lower than the reservoir or product tank. More specific to the preferred embodiment, the check valve imposes a 1.5 psi bias such that flow is only permitted when the pressure in the first bed exceeds the pressure in the reservoir or product tank by 1.5 psi.
- the second bed 12 is connected with the reservoir or product tank 30 by way of a second check valve 34 or other unidirectional valving means. The second check valve 34 again provides for unidirectional flow of the primary product gas from the second bed 12 to the reservoir or product tank 30 .
- a pressure equalization flow path 40 extends between outlets of the first and second beds.
- a concentration equalization valve 42 is either open or closed to selectively permit or prevent gas flow through the flow path between the first and second beds.
- a control means 50 cyclically causes the cross-over valve actuating means (i.e., two solenoids) and the concentration equalization valve 42 to be operated. The control means periodically and cyclically enables a concentration equalization valve actuator which is also a solenoid.
- Oxygen sensor 43 registers the oxygen concentration of the product gas and can be located in the product tank 30 .
- the sensor 43 communicates a sensed value to the microprocessor (i.e., control means).
- a pressure sensor 45 registers the pressure in the product tank and communicates the same to the microprocessor.
- the control means causes the cross-over valving means 20 to alternate between its first and second positions for the appropriate period during each cycle segment.
- a cycle segment can be either the product gas generation cycle or the purge cycle.
- the cycle duration is selected such that each bed is connected with the source of air for a period of time which is equal to or less than the breakthrough time.
- the mechanism which triggers the cross-over valving can be based on the pressure, such as a pressure set point or set point range, in the bleed line from the product tank as is used in a pressure-based control cycle, or it can be based strictly on a residence time from the product-producing bed, such as in a timing cycle-based control cycle.
- control cycle can utilize variable pressure in order to achieve a residence time within a defined range based upon a projected breakthrough time.
- the beds are 3.5 inches in diameter, 15 inches in length, and each contains 6.5 pounds of 5A zeolite.
- the gas mixture is supplied at up to 21 psi of pressure to the first bed.
- the second bed i.e., a “used” bed
- the concentration equalization valve is opened allowing primary product-enriched gas from the first bed to flow into the evacuated second bed.
- one bed is evacuated and the other has just reached the pressure set point which drives flow between the beds.
- the flow is of high oxygen content so that the first product to pass into the product tank via line 46 is essentially product gas produced by the oxygen beds.
- the second bed pressure is product-enriched gas to purge the sieve bed.
- the cross-over valving means 20 is actuated to reverse its position. Actuating the cross-over valving means discontinues supplying of the gaseous mixture to the first bed and commences evacuating it and concurrently discontinues evacuating the second bed and commences supplying it with the gaseous mixture.
- the concentration equalization valve 42 remains open to continue allowing a purge supply of product-enriched gas to flow into the second bed. This equalizes the concentration of gas which is supplied to the product tank since the cycling is sequenced so that the product gas proceeds from the breakthrough zone to flow into the product tank. Subsequently, the concentration equalization valve closes and terminates the flow of primary-product gas between the beds. In the second segment of the cycle, the pressure in the second bed increases approaching the gas mixture source pressure. Concurrently, the pressure in the first bed decreases approaching atmospheric pressure.
- the concentration equalization valve 42 is opened allowing the primary product-enriched gas in the zeolite voids of the second bed to flow to the first bed. While the primary product-enriched gas is flowing to the first bed, the cross-over valving means is actuated. Actuating the cross-over valving means discontinues the evacuation of the first bed and commences supplying the gaseous mixture and concurrently discontinues supplying the gaseous mixture to the second bed and commences evacuating it. Subsequent to actuating the cross-over valving means, the concentration equalization valve is closed terminating the pressure equalizing flow of the primary product-enriched gas between the beds. The steps are cyclically repeated to provide continuing fractionating of the primary product gas from the mixture.
- the reservoir or product tank 30 maintains a reservoir of oxygen at a minimum pressure of about 14 psi.
- the oxygen-enriched gas contains from about 50 to about 99 percent, desirably from about 70 to about 98 percent, and preferably from about 84 to about 96 percent by volume of oxygen.
- product tank 30 can be connected to a pressure regulator (not shown) for controlling the pressure of the oxygen to a patient. Typically a pressure of 5 psi is utilized.
- a flow meter also not shown in FIG. 1 ) can be utilized to limit the flow rate to the patient such as from 0.1 to about 6 liters per minute with a flow rate of about 3 liters per minute often being utilized.
- a humidifier (not shown) can add moisture to the oxygen-enriched gas.
- the gas is delivered to the patient via tubing and breathing apparatus which can be inserted into the patient's nostrils.
- oxygen-enriched gas from an oxygen concentrator such as that described hereinabove can be fed in any variety of methods to a compressor where it is compressed to very high pressure and stored in a portable or mobile container such as a gas cylinder.
- a concentrator (not shown but such as described hereinabove) has an oxygen-enriched product tank 30 wherein the pressure can vary as from about 14 to about 21 psi.
- the oxygen-enriched gas therein is fed via line 201 to a flow meter 210 at the pressure of the concentrator tank, that is from about 14 to about 21 psi.
- Flow meter 210 controls the flow rate of the oxygen-enriched gas which is fed via line 211 to buffer tank 220 wherein the gas pressure therein can also range from about 14 to about 21 psi.
- the predominantly oxygen gas is fed to compressor 100 .
- Compressor 100 in a manner described below, compresses the oxygen-enriched gas to a pressure of about 2,250 psi and stores it within a mobile or portable cylinder 500 .
- the feed pressure thereto can range from 21 psi down to a predetermined cut-off pressure such as about 5 or 7 psi whereupon the compressor is automatically shut off by a pressure sensor switch.
- FIGS. 3 and 4 relate to embodiments wherein oxygen-enriched air from product tank 30 of the oxygenator is fed by various methods desirably to a buffer tank of the compressor but prioritized as with regard to oxygen concentration and/or a sufficient pressure.
- the feed rate to a patient can vary from between 0.1 and 6 liters per minute at a pressure of a predetermined value such as 5 psi with the remaining oxygen-enriched gas generally being fed at a different pressure to the buffer tank.
- the buffer tank can generally contain a broad range of pressure therein such as, for example, between 14 and 21 psi.
- FIG. 3 and 4 relate to embodiments wherein oxygen-enriched air from product tank 30 of the oxygenator is fed by various methods desirably to a buffer tank of the compressor but prioritized as with regard to oxygen concentration and/or a sufficient pressure.
- the feed rate to a patient can vary from between 0.1 and 6 liters per minute at a pressure of a predetermined value such as 5 psi with the remaining oxygen-enriched gas generally
- the pressure thereof can drop down to a predetermined cut-off pressure, such as 7 psi, which is higher than the pressure of the gas being fed to the patient to ensure an adequate flow of the oxygen-enriched gas to the patient.
- a 5-psi regulator 210 emits oxygen-enriched gas from product tank 30 into flow line 220 and feeds the same to flow meter 230 which subsequently emits the oxygen-enriched gas to the patient at a predetermined flow rate of from 0.1 to 6 liters per minute.
- the flow meter can be closed so that all the enriched oxygen is directed to the compressor.
- Gas not directed to the patient is carried via line 240 to two-way valve 250 .
- a very small portion of the gas in line 220 is directed through line 260 through restrictor 262 into oxygen sensor 265 which detects whether or not the concentration of the oxygen is of a predetermined value such as is at least 84 percent.
- two-way valve 250 When the oxygen sensor detects a concentration at or above the predetermined level, two-way valve 250 is open and permits the oxygen-enriched gas to flow through line 270 into buffer tank 200 wherein the pressure is essentially the same as the oxygen product tank pressure. However, should the oxygen sensor not detect a suitable oxygen concentration, two-way valve 250 is closed so that the oxygen concentrator can build up a sufficient oxygen concentration. This arrangement prioritizes the flow of oxygen-enriched gas so that the patient is assured of receiving a gas having a minimum oxygen concentration therein.
- Buffer tank 200 can have a regulator 280 thereon generally set at 12 psi to admit the oxygen-enriched gas to the compressor when needed. Alternatively, the pressure regulator can be set at anywhere from about 13 to about 21 psi.
- Restrictor 290 controls the flow rate of gas from the buffer tank to the compressor. Should the compressor drop the pressure in the buffer tank to below a predetermined value, a pressure sensor (not shown) will automatically cut off the flow of gas at a pressure above the pressure of the gas being fed to the patient. This prioritization assures that the patient receives priority with regard to oxygen-enriched gas.
- FIG. 4 emits the oxygen-enriched gas through a 14 to about an 18-psi regulator 300 into flow line 305 having flow rate restrictor 307 .
- the flow is then split with a portion via line 310 going through 5-psi regulator 320 and into flow meter 330 which then directs the gas to the patient at a desired flow rate of generally from 0.1 to 6 liters per minute, although optionally the flow meter can be closed.
- the remaining portion of the gas is directed via line 340 to two-way valve 350 .
- a small portion of the gas going to the patient is diverted through line 365 through flow restrictor 367 to oxygen sensor 360 .
- the oxygen sensor is set at a predetermined value such as a concentration of 84 percent so that when the level is not achieved, two-way valve 350 is closed through electrical line 355 .
- a predetermined value such as a concentration of 84 percent
- This aspect allows the amount of oxygen in the concentrator tank to be increased by the oxygenator unit. The same prioritizes the concentration of oxygen to ensure that the patient receives an amount of oxygen of at least the minimum predetermined value.
- the gas flows through two-way valve 350 into line 370 and into buffer tank 200 where it is stored generally at a pressure of about 14 to 18 psi.
- a relief valve 385 which can be set at any desired value such as about 14 psi ensures that gas under sufficient pressure is being admitted to the buffer tank.
- the oxygen-enriched gas is admitted to the compressor via line 380 .
- a pressure sensor switch (not shown) can be set to a predetermined value (e.g., about 7 psi) to ensure or prioritize that a sufficient amount or flow of gas is being fed to the patient.
- the predetermined shut-off pressure of the compressor is always above the pressure of the gas being fed to the patient. The embodiment of FIG. 4 is preferred.
- FIGS. 2 , 3 , and 4 generally constitutes a preferred embodiment of the present invention
- oxygen product tank 30 need not be utilized.
- the oxygen-enriched air from an oxygen concentrator such as shown in FIG. 1
- the buffer tank via the shown and described flow lines of the various embodiments such as set forth in FIGS. 2 , 3 , and 4 .
- the oxygen-enriched air will be separated with one component directed to the patient and the other component being directed to the buffer tank.
- Prioritization of the oxygen-enriched gas to the patient either by a minimum oxygen concentration or a sufficient pressure in the buffer tank is still generally utilized.
- an enriched oxygen product tank 30 can be utilized and the buffer tank can optionally be eliminated.
- enriched oxygen from the product tank can be fed via one component to the patient and to a second component via the flow line shown to the compressor. In this situation, prioritization of the desired flow and oxygen concentration to the patient is maintained as described hereinabove with regard to either the level of oxygen concentration or an adequate pressure being admitted to the compressor.
- the compressor assembly 100 As shown in FIGS. 7 and 8 , it generally utilizes an AC electric-drive motor 105 which can rotate at any desired speed, e.g., 1,700 rpm.
- Motor 105 can contain a fan (not shown) either within the motor housing or immediately adjacent thereto to draw air through the motor to cool the same.
- Power is conveyed from the motor through shaft 106 to drive wheel 107 .
- the drive wheel has a plurality of grooves therein to receive a V-belt such as main drive belt 109 .
- Such belts are generally reinforced with fiber and have a very long life.
- Main drive belt 109 is connected to main gear 110 which contains a plurality of grooves 113 therein.
- peripheral grooves 113 coincides with the grooves of drive wheel 107 and matingly engage a plurality of projections located on main drive belt 109 .
- Extending from main gear 110 is an offset hub gear 114 which has a much smaller diameter than main gear 110 .
- Hub gear 114 also has grooves 115 thereon to receive a secondary drive V-belt 122 .
- a second or secondary large gear 116 has grooves on the periphery thereof which matingly engage the secondary drive V-belt 122 .
- Offset hub 114 through the secondary V-drive belt 122 contacts and serves to drive secondary gear 116 which in turn is connected to crankshaft 130 .
- crankshaft 130 is a desirably low speed such as approximately 50 rpm.
- Both drive belts 109 and 122 desirably have a spring-loaded idler arm 125 and 127 , respectively, which applies a small amount of tension.
- the actual pull tension of the first belt can be about 20 pounds, whereas the tension on the second belt can be about 100 pounds.
- the multi-stage compressor of the present invention can have any number of pistons, but in the present embodiment has three. As shown in FIG. 8 , two of the pistons, i.e., the first and third pistons, are located on the same crankshaft lobe, whereas the second piston is located on a different lobe offset 180 degree. from the first and third pistons. The reason for this is that pistons one and three will be drawing in air when the second piston is being compressed and vice versa.
- a crankshaft can be utilized which contains three lobes thereon, each offset from one another by approximately 110 degrees to 130 degrees, e.g., about 120 degrees, so as to minimize the torque resistance applied to the motor during the compression stroke.
- the compressor of the present invention has three pistons, i.e., piston # 1 ( 131 ), piston # 2 ( 133 ), and piston # 3 ( 135 ). Each piston is contained within a separate cylinder and thus piston # 1 is contained within the first cylinder ( 132 ), the second piston is contained the second cylinder ( 134 ), and the third piston is contained within the third cylinder ( 136 ). While the diameter of the head 140 of the first piston is approximately equal to the diameter of the base portion of the piston as shown in FIGS. 8 and 9 , the diameter of the head of piston # 2 ( 133 ) is smaller than that of piston # 1 , and the diameter of the head of piston # 3 ( 135 ) is smaller than the diameter of piston # 2 ( 133 ).
- each piston 131 B, 133 B, and 135 B is of the same size for reasons set forth hereinbelow.
- each contains an annular sleeve 134 S and 136 S on the inside of the cylinder wall the internal diameter of which is approximately equal to the external diameter of piston heads # 2 and # 3 respectively.
- the piston head has two annular grooves or recesses therein, that is top piston annulus 141 and bottom annulus 144 .
- the top annulus contains a U-shaped seal therein generally made out of a Teflon.®..TM. alloy or other low-friction material.
- the seal contains a coil tension spring 143 therein which forces the seal radially outward against the cylinder wall to prevent compressed air from leaking through the piston head between the piston and the cylinder wall.
- seal 142 is U-shaped so that upon the build-up of pressure in the cylinder head, the compressed gas will communicate and enter into the seal and force the outer edge thereof radially outward against the cylinder wall.
- Piston head bottom annulus 144 contains a flat or vertical glide ring 145 which extends around the annulus and is also radially forced outwardly by a coil tension spring 146 located therein.
- the bottom glide ring 145 can be made out of a Teflon.®..TM. alloy and serves as a piston glide ring.
- Connecting rod 148 connects the piston head to piston base 150 .
- the piston bases of all three pistons are the same diameter and accordingly engage a mating cylinder of essentially the same diameter.
- the piston base contains an upper base annulus 151 and a lower base annulus 155 , both of which have a glide ring therein similar to if not identical to glide ring 145 of piston head annulus 144 .
- upper base annulus 151 has a glide ring 152 therein which is forced radially outward by coil spring 153 .
- lower base annulus 155 has a glide ring 156 therein which is radially forced out by coil-spring 157 .
- three glide rings have been shown and described as being identical, they can be different and use different material, and the like.
- Piston base 150 contains bore 158 which extends laterally therethrough. Bore 158 receives wrist pin 159 . The wrist pin and coil spring both serve to maintain glide ring 156 in a radially outward position so as to bear against
- the two-part piston assembly of the present invention contains bottom connecting rod 160 as shown in FIG. 10 .
- the connecting rod contains a top bore 161 through which wrist pin 159 extends.
- Bottom bore 163 of the connecting rod extends about and matingly engages an appropriate portion of the crankshaft.
- sealed portion 164 of the connecting rod contains bearings therein.
- the net result of the two-part piston ring assembly of the present invention is that bearing 164 of connecting rod 160 can freely rotate with the crankshaft in a rotary or circular motion whereas top bore 161 moves in only a linear or reciprocal motion allowing piston rod 148 with the piston head and base thereon to move only in a linear reciprocating direction. The same thus prevents lateral forces from being applied to the cylinder wall which often results in wear and can create an oval-shaped cylinder wall.
- the two-part piston ring assembly of the present invention thus promotes long life of the piston and cylinder wall.
- each piston serves to compress the gas admitted therein to a higher pressure
- a desirable aspect of the present invention is that each subsequent piston head has a smaller area.
- piston # 1 ( 131 ) can have a diameter of approximately 1 3 ⁇ 4 inches
- piston # 2 has a diameter of approximately 1 1 ⁇ 4 inches
- piston # 3 can have a diameter of approximately 1 ⁇ 2 inch, which can be the diameter of essentially piston rod 148 .
- the increase in pressure from each stage or piston is proportional to the others.
- the compression ratio of each piston can vary, but generally is the same. Although compression ratios of up to 10 can be utilized, the desirable pressure range is from approximately 6 to about 8.
- cooling line 182 from the first piston to the second piston can be in the form of an undulating path or the like and the same is true with regard to cooling line 184 between the second and third pistons.
- the operation of the compressor portion of the apparatus is as follows. Electric motor 105 which operates independently of the compressor feeding air to the molecular sieves in the oxygen concentrator portion of the apparatus, through drive belts 109 and 122 , rotates crankshaft 130 thereby causing piston # 1 , # 2 , and # 3 ( 131 , 133 , 135 ) to reciprocate and compress air in their respective chambers. More specifically, enriched oxygen gas from the compressor buffer tank is fed to the first piston.
- Piston 131 contains an inlet check valve 172 , which permits air to enter the cylinder head space above the piston, and outlet check valve 173 , which permits the compressed gas to exit from the first piston.
- second piston 133 has an inlet check valve 175 which permits the compressed air from piston # 1 to be drawn into the head space above piston 133 , but prevents it from being forced back into the first piston.
- Outlet check valve 176 prevents the gas compressing the second piston from being drawn back into the piston once it has been expelled therefrom.
- Rupture disk 180 is a safety feature designed to rupture at a pressure in excess of the desired storage pressure of the gas cylinder. Thus, in the present embodiment, such a pressure can be approximately 2,800 psi. Although not shown, rupture disks can also be provided in the flow lines from the exit of the first and second cylinders to prevent undue build-up in these lines.
- a pressure regulator 181 serves to emit the oxygen-enriched gas at a pressure of about 5 psi to a patient via a flow meter (not shown) at any desired rate, such as from about 0.1 to about 6 liters per minute.
- the buffer tank contains oxygen-enriched gas at a pressure of generally from about 7 or 14 psi to about 21 psi.
- the compressor is designed to commence compression generally when the pressure in the tank is generally at a maximum until it drops to a predetermined pressure, e.g., 7 or 8 psi.
- a predetermined pressure e.g. 7 or 8 psi.
- the pressure is electrically controlled by various switches, sensors, relays and the like.
- a master ON/OFF switch emits power to compressor motor 105 which in turn causes the crankshaft to rotate and compress air.
- Two pressure-sensitive switches exist: a low pressure sensor which detects pressure below a predetermined value, e.g., 7 to 12 psi, and a high pressure sensor which detects pressure above 2,250 psi.
- the low pressure sensor When the low pressure sensor detects pressure below the predetermined level, it will turn off motor 105 through a relay switch. This allows oxygen inflow from the concentrator to be built-up in the buffer tank to a desired pressure.
- the low pressure sensor is a-solid-state relay. Should the relay fail, it will fail closed and allow the motor to continue to run. Accordingly, this relay switch is connected in series with the high pressure sensor mechanical relay switch which will shut the motor off when the pressure in the cylinder reaches approximately 2,250 psi.
- FIGS. 5 and 6 show the electrical circuitry of the compressor. Power is fed to the compressor initially through the resettable breaker 600 and then to power switch 610 . When the power switch is pushed to the “ON” position, power passes to the motor start switch 620 , the start relay common contacts 630 , and also lights the power indicator 640 . When start switch is depressed, the start relay coil is energized which causes both switches of the relay to close.
- One of these closed switches passes the power to high pressure switch 650 which is normally closed when the output pressure of the compressor is under 2,250 psi.
- the output of the high pressure switch is fed back to the start relay coil to keep the coil energized without the start switch being depressed, but will cut power to the coil when high pressure is reached. (This occurs when a tank has been filled.)
- the output of the high pressure switch is also connected to the common of low pressure switch 660 . While the input pressure from the concentrator is above the predetermined value, e.g., 7 psi, the low pressure switch is closed and the normally closed contact has power. This power signal is fed to the drive contact of the solid-state relay which, in turn, allows the solid-state output to be “turned on.”
- the output of the high-pressure switch is also connected to the run indicator 670 which then lights up.
- the second closed switch of the start relay is connected to the “input” of the solid-state relay.
- the solid-state relay When the solid-state relay is turned on by the signal from the low pressure switch, power is passed to motor 105 and its start capacitors through the solid-state output.
- a common line is connected to the other side of the motor to complete the circuit.
- An hour meter 690 is wired in parallel to the motor to monitor motor run time.
- the motor beings to run and remains running until one of two conditions occur.
- the first condition would be the input pressure to the compressor falls below a predetermined value, e.g., 7 psi. This will cause low pressure switch 660 to open and solid-state relay 695 to turn off, which in turn shuts off motor 105 . If the input pressure to the compressor rises above a desired predetermined pressure, low pressure switch 660 will close and once again turn on the solid-state relay and start the motor. This is a normal occurrence that is dependent upon concentrator efficiency and may be repetitive.
- the second condition that will shut off the motor occurs when an oxygen tank has been filled.
- the output pressure will rise above 2,250 psi and therefore cause high pressure switch 650 to open.
- This cuts the power to the start relay coil which causes both switches to open and cuts the power to both the input of the high pressure switch and the input to the solid-state relay thereby shutting off the motor.
- To start the motor after this condition is reached requires start switch 620 to be depressed. If greater than 2,250 psi remains, the high pressure switch will remain open and no signal will be fed back to the start relay coil to keep it energized therefore causing the motor to remain off. While the high pressure switch is open, run indicator 670 remains off
- compressor 100 is completely independent of the oxygen concentrator as well as utilization of gas compressed thereby as a power or energy source for the compressor.
- the pressure accumulated in the oxygen concentrator is not utilized to drive or operate a pressure intensifier.
- a distinct advantage of the apparatus and method for forming oxygen enriched gas and compression thereof according to the present invention is the creation of a mobile or portable source of gas containing high purity oxygen.
- Patients who require oxygen-enriched gas as from about 80 to about 98 percent, are no longer confined to the vicinity of an oxygen concentrator as for example a bed, home, hospital, or a wheelchair. Rather, the patient can carry the mobile gas cylinder in any convenient manner, such as in a backpack, and thus can take trips via wheelchair, an automobile, and even planes and trains.
- the oxygen supply can be anywhere from about 2 to about 24 hours or even longer.
- a further embodiment of the present invention relates to an electromechanical oxygen distribution device or system as for use in a home to supply a patient with concentrated oxygen and also to concurrently supply pressurized and concentrated oxygen to a storage cylinder as for a patient's personal ambulatory use.
- the device is designed to be utilized in association with an oxygen source capable of supplying oxygen at a preferred concentration of at least 85 percent or 90 percent by volume at various pressures such as generally from about 2 to about 20 psig, and desirably from about 2.5 or about 4 to about 10 psig.
- Sources of concentrated oxygen include an oxygen concentrator as set forth herein above, or, conventional or commercially available oxygen concentrators, such as for example, but not limited to, Mallinckrodt-Aeris 590; Russ ProductsMillienum; Sunrise; and the like.
- oxygen concentrators can have various oxygen concentration outputs, pressures, and a desirable flow rates such as at least about 3, 5 or 6 liters per minute.
- the oxygen distribution system or device 800 has housing 810 as well as oxygen test mode inlet 815 , oxygen normal operation inlet 820 for receiving oxygen from a concentrated oxygen source, oxygen outlet 825 for feeding oxygen to a patient, oxygen flow meter 830 for regulating the flow of oxygen to a patient, pressure gauge 835 , power switch 840 for turning the compressor unit or device on and off, and fill connector 845 for connecting the compressed gas to gas storage cylinder 1000 .
- the radial compressor generally utilizes an AC electric drive motor 905 which can rotate at any desired speed, such as generally from about 500 or 1,000 to about 3,600 or 6,000 RPM, and preferably from about 1,100 to about 1,300 RPM.
- the drive motor can be of any horsepower and is desirably from about 1/100 to about 1 ⁇ 2 horsepower, with 1/12 horsepower most preferred.
- Drive motor 905 can contain a fan (not shown) within the motor housing or immediately adjacent thereto to draw air through the motor thereby cooling the same.
- Drive belt 909 is connected to compressor pulley 910 which has a plurality of grooves and/or teeth therein.
- an idler arm (not shown) can be utilized to keep tension on the drive belt.
- Compressor pulley 910 is connected to crankshaft 911 .
- the radial multi-stage compressor of the present invention can have any number of pistons, such as from 2 to about 12, desirably from about 3 to about 8 or 10, with about 5 being preferred.
- the preferred embodiment contains 5 pistons 915 , 916 , 917 , 918 , and 919 , that is the first through fifth pistons respectively, radially arranged around crankshaft 911 .
- Each piston is located within separate cylinders 925 , 926 , 927 , 928 , and 929 with first piston 915 located in first cylinder 925 , etc.
- first piston 915 and second piston 916 have a top and base which are integrally formed from a single element, and generally have the same diameter.
- the third piston 917 , fourth piston 918 , and fifth piston 919 each have top portions which are smaller than the base portions thereof.
- each subsequent piston is located on essentially the opposite side of the housing, the forces exerted on the various pistons by the crankshaft and the expanding air in the cylinders are generally balanced and result in the efficient transfer of energy.
- the radial design results in a lightweight housing, which can be made of aluminum.
- the radial compressor is designed so that the volume of gas is reduced, desirably proportionally, in each succeeding piston/cylinder assembly.
- the compressible area 935 of the first piston/cylinder assembly is larger than the compressible area 936 of the second piston/cylinder assembly, and so on.
- the compression ratio can generally range from about 1 to about 10, and is preferably from about 2 to about 5, with about 2.5 being most preferred.
- Motor 905 drives annular crankshaft 911 which drives master connecting rod 920 , as well as slave connecting rods 921 through 924 each operably connected thereto.
- the crankshaft has an offset thereon to allow reciprocation of the pistons.
- the operation of the radial compressor generally is as follows: Drive motor 905 through, drive belt 909 , and pulley 910 rotates crankshaft 911 and thus operably causes first through fifth pistons 915 - 919 to reciprocate and compress a source gas in their respective chambers. More specifically, a gas, which is preferably enriched oxygen gas is fed to the first piston 915 .
- the gases which are fed or supplied to the radial compressor can be supplied from various sources, herein incorporated by reference, such as molecular sieve oxygen concentrator, a product tank or a buffer tank.
- gases from liquid or a high pressure oxygen cylinder which is typically too large and heavy to be easily moved, can serve as a source gas which is fed to the compressor.
- These large cylinders contain a wide range of oxygen therein, such as typically from about 800 to about 900 cubic feet of compressed or liquefied oxygen therein.
- each cylinder head contains conventional check valve members such as ball and spring assemblies such as those set forth in FIG. 8 which permit a gas to flow in and out of the piston/cylinder assembly in a desired fashion, i.e. one direction.
- the preferred check valve member of the present embodiment has a spring rated preferably at 2 psi or less.
- each cylinder head assembly will contain two outlet check valves located sequentially with respect to one another as diagrammically shown in FIG. 14 .
- FIGS. 11 and 12 show various fittings and piston head assemblies containing check valves.
- Inlet check valve 940 of the first piston assembly permits the gas to enter first compressible area 935 and outlet check valves 941 permits the compressed gas to exit the first piston.
- the check valves permit the flow of gas in one direction so that once the gas is admitted to the first piston, it cannot be forced back out through the inlet check valve during the compression stroke of the piston.
- outlet check valves 941 prevents gas form being sucked in during the intake stroke of the first piston.
- second piston 916 has an inlet check valve 942 which permits the compressed gas from the first piston/cylinder assembly to be drawn into the second compressible area 936 , but prevents it from being forced back into the first piston.
- Outlet check valves 943 prevents the gas compressed in the second piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom.
- third piston 917 has an inlet check valve 944 which permits the compressed gas from the second piston/cylinder assembly to be drawn into the third compressible area 937 , but prevents it from being forced back into the second piston.
- Outlet check valves 945 prevents the gas compressed in the third piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom.
- fourth piston 918 has an inlet check valve 946 which permits the compressed gas from the third piston/cylinder assembly to be drawn into the fourth compressible area 938 , but prevents it from being forced back into the third piston.
- Outlet check valves 947 prevents the gas compressed in the fourth piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom.
- fifth piston 919 has an inlet check valve 948 which permits the compressed gas from the fourth piston/cylinder assembly to be drawn into the fifth compressible area 939 , but prevents it from being forced back into the fourth piston.
- Outlet check valves 949 prevents the gas compressed in the fifth piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom.
- appropriate tubing able to withstand high pressures such as metal tubing, connects various parts of the oxygen distribution device such as the various piston/cylinder assemblies, the buffer tank, the various regulators, the storage cylinder, etc., in a conventional manner known to those skilled in the art.
- each sequential piston cylinder assembly is not located adjacent to the next higher pressurizing piston cylinder assembly in a circumferential direction around the compressor, but is staggered or offset from one another by at least one piston cylinder assembly so as to balance the forces on the compressor and the crankshaft.
- each succeeding piston cylinder assembly with respect to increasing the pressure of the enriched oxygen from the previous assembly is located at least two assembly positions away in a circumferential direction so that there is desirably at least one intervening piston cylinder assembly between each set or pair of sequentially or succeeding pressure piston cylinder assemblies.
- the first cylinder will gradually build up a pressure, with the second cylinder gradually building up a higher pressure, etc. until a desirable pressure is reached in storage cylinder 1000 .
- the desired range from the concentrator or other oxygen source as from about 2 to about 20 psig is approximately 34 psig.
- the second compressor will gradually build up to a pressure of approximately 110 psig with a third compressor gradually building up to a pressure of approximately 300 psig.
- the fourth compressor will gradually build up to a maximum pressure of about 800 psig whereas the last or fifth compressor will build up to a maximum pressure of approximately 2,000 psig.
- cylinder 1000 can accept pressures in a range generally from about 500 to about 4,000 psig, desirably from about 1,500 psig to about 3,000 psig, and preferably from about 1,900 psig to about 2,100 psig.
- the compressed gas is then fed through connector check valve 950 into a gas storage cylinder 1000 through appropriate tubing, connectors, valves, and the like.
- These storage cylinders can generally be of any conventional size with standard sizes such as M6, C, D, and E, being suitable.
- the gas cylinder can hold a volume of compressed gas in a range generally from about 10 to about 650, desirably from about 50 or 100 to about 400 or 500, and preferably from about 150 to about 250 liters.
- the cylinder has a built in pressure gauge of from about 0 to about 3,000 psig, and is equipped with a self-contained release valve as well as a high pressure rupture disk set for any desirable pressure such as about 6,000 psig. It can also have a hose barb outlet for connection to a patient cannula.
- the radial compressor 900 can be substituted directly for compressor assembly 100 , that is in association with an oxygen concentrator, and with various flow schemes, designs, etc., whether preferably prioritized to insure that a patient receives a required amount of oxygen-enriched gas, or not prioritized. Accordingly, the flow diagram of FIG. 2 , 3 , or 4 can be utilized but it is to be understood that generally any other flow system can also be utilized to route the enriched oxygen from product tank 30 either directly or indirectly, etc., to radial compressor 900 .
- the oxygen distribution system or device of the present invention containing the radial compressor is diagrammically shown in FIG. 14 .
- the oxygen distribution device generally comprises oxygen sensor 860 , reservoir or buffer tank 875 , to accumulate or store the concentrated oxygen, the radial multi-stage compressor 900 , high pressure switch 880 , pressure gauge 835 , output oxygen fitting or connector 845 , portable high pressure cylinder 1000 . Also included is flow regulator 877 and flow meter 830 .
- the oxygen device also contains a test mode aspect, explained in greater detail hereinbelow, to determine at least the concentration of the oxygen from an oxygen concentrator, a large oxygen cylinder, or other source, before it is connected to the oxygen device.
- oxygen distribution device 800 is assigned primarily for home use, it can also be used in other institutions such as nursing homes, clinics, hospital rooms, offices, and the like. As noted, the oxygen distribution device can receive various levels of concentration of oxygen such as at least about 50% or 75%, and desirably at least about 80%. However, with respect to the present invention, the oxygen device is generally designed to receive at least about 85%, and preferably at least about 90% oxygen and more preferably about 93% by volume plus or minus 3%.
- the oxygen source such as a concentrator is attached to oxygen inlet 820 . From there a small portion is fed to oxygen sensor 860 which continuously monitors the oxygen concentration. The remaining great majority of the oxygen is fed to a reservoir or buffer tank 875 whereafter it is channeled into two flow streams with a selected or predetermined portion of oxygen such as from about 1 to about 3, 4, or 5 and preferably about 2 liters per minute being fed to the compressor and with a selected or predetermined portion such as from about 0.1 to about 6, desirably from 1 to about 0.5 to about 5, and preferably from about 1 to about 3 liters per minute, flowing to a patient.
- a selected or predetermined portion of oxygen such as from about 1 to about 3, 4, or 5 and preferably about 2 liters per minute
- a selected or predetermined portion such as from about 0.1 to about 6, desirably from 1 to about 0.5 to about 5, and preferably from about 1 to about 3 liters per minute, flowing to a patient.
- the oxygen distribution system of the present invention is prioritized in that the radial compressor will only run when oxygen sensor 860 determines that the oxygen concentration is at or above a minimum predetermined level, for example 90% by volume. Thus, should the oxygen concentration drop below the predetermined level during operation of the compressor, sensor 960 will shut off the compressor until the concentration reaches the predetermined level. However, while the compressor is shutoff to build up the oxygen level, the enriched oxygen is continuously fed to the patient. As apparent from FIG.
- the enriched oxygen from the buffer tank passes through pressure regulator 877 and flow meter 830 .
- Pressure regulator 877 is set at any desired predetermined pressure level such as anywhere from about 1 to about 5 and desirably about 3 psig.
- the flow meter can be set by the patient, or by any other competent medical person such as a physical therapist, medical doctor, etc. to a desired flow rate.
- the oxygen being fed to the compressor goes through a series of compression stages or cylinders with each subsequent stage pressurizing the gas to a higher pressure until finally the last stage achieves the desired indicated pressure whereupon cylinder pressure switch 880 will turn off compressor motor 905 .
- burst disk 884 is provided to prevent an undue buildup of pressure within the storage cylinder.
- the only requirement required by the patient in operating the oxygen distribution device of the present invention is to turn on power switch 840 and to set flow meter to desired rate as determined by a medical person or the like.
- the device 800 may also advantageously include an oxygen concentration testing function.
- This test mode system includes the test mode inlet 815 .
- the inlet 815 communicates with the oxygen sensor 860 through a check valve 854 whose downstream side is in communication with the downstream side of a check valve 872 that normally passes gas from the normal mode inlet 820 .
- the downstream sides of the check valves 854 , 872 are both in communication with a flow restrictor 856 which limits the flow of gas to the oxygen sensor 860 .
- the check valve 872 prevents the flow of gas from the test mode inlet 815 toward the normal mode inlet 820 .
- the check valve 854 prevents the flow of gas from the normal mode inlet 820 toward the test mode inlet 815 .
- a test pressure switch 852 senses the pressure of gas applied to the test mode inlet 815 .
- the switch 852 provides an indication that pressurized gas is being applied to the test mode inlet 815 .
- the switch 852 may, for example, be actuated by a gas pressure of 2.1 psi or greater.
- the compressor 900 Upon indication of pressurized gas being applied to the test mode inlet 815 , the compressor 900 is disabled and the oxygen sensor 860 is then used to test the oxygen level or concentration of the gas applied to the test mode inlet 815 .
- the operation of the device 800 may, for example, be advantageously controlled by a controller 1100 .
- the controller 1100 is most preferably a microcontroller, but may be, for example, a microprocessor with associated memory and input/output circuitry, an application specific integrated circuit, a field programmable gate array, or other suitable programmable device.
- the controller 1100 receives inputs from the oxygen sensor 860 , the high pressure switch 880 and the test pressure switch 852 and provides outputs to the compressor 900 and the indicators 1102 , 1104 , 1106 , 1108 , 1110 .
- the controller 1100 may also, for example, incorporate the previously mentioned control means 50 .
- the indicators 1102 , 1104 , 1106 , 1108 , 1110 may be, for example LEDs, light bulbs, an LCD screen, or other suitable indicators, including, for example, audible indicators.
- the FULL indicator 1102 , the WAIT indicator 1104 , the FAULT indicator 1106 and the TEST indicator 1108 will come on for a short time (e.g., 1 second) to provide an indication that these indicators are functioning. Then the indicators 1102 , 1106 , 1008 will go off.
- the WAIT indicator 1104 will remain on long enough for the oxygen sensor 860 to reach operating temperature (e.g., 3.0 minutes).
- the controller 1100 also monitors the heater current and voltage and the output current voltage of the oxygen sensor 860 whenever the device 800 is turned on. If a fault in the oxygen sensor 860 is detected at any time, the WAIT indicator 1104 is flashed at a one second rate, the FAULT indicator 1106 is activated and all other indicators are deactivated. In this state, the compressor 900 and the test mode function will not operate.
- the device 800 will operate in normal mode. That is, if there is an acceptable level of oxygen as sensed by the oxygen sensor 860 in the gas applied to the normal mode inlet 820 (e.g., greater than 91 percent) the compressor 900 will run and the FILLING indicator 1110 will be activated. If the high pressure switch 880 is activated, the FULL indicator 1102 will be activated, the FILLING indicator 1110 will be deactivated and the compressor 900 will be deactivated by the controller 1100 .
- the FAULT indictor 1106 will be flashed at a one second rate by the controller 1100 and the device 800 must be reset to operate.
- test pressure switch 852 detects gas pressure at the test mode inlet 815 , the device 800 will operate in test mode. If the gas pressure at the inlet 815 is removed, the device 800 will again operate in normal mode.
- the controller 1100 Whenever the device 800 enters or leaves test mode, the controller 1100 will suspend the operation of the device 1100 for a period of time (e.g., 30 seconds) and activate the WAIT indicator 1104 to allow the oxygen sensor 860 time to stabilize with a new input gas.
- a period of time e.g. 30 seconds
- the controller 1100 will disable the compressor 900 , activate the TEST indicator 1108 and use the oxygen sensor 860 to test the oxygen level of the gas applied to the test mode inlet 815 . If there is an acceptable level of oxygen, the controller 1100 will activate the FULL indicator 1102 . Otherwise, the controller 1100 will activate the FAULT indicator 1106 .
- the test mode of operation permits a user to conveniently check the oxygen content of a cylinder or concentrator output without activating the compressor of the device.
- the user activates the test mode by merely connecting a gas source to the test mode inlet. Normal operation resumes when the gas source is removed.
- the user is not required to perform any other operation. This is particularly advantageous for impaired, unsophisticated or technology intimidated users.
- the radial compressor and assembly comprising connecting tubing etc. is compact and light, approximately % the size of compressor assembly 100 shown in FIG. 8 , and approximately 1 ⁇ 4 the weight thereof.
- the radial compressor of the present invention can be utilized with any commercially available oxygen concentrator and has a unitized construction and compact design for easy placement and storage.
- the radial compressor of the present invention is very efficient with respect to power consumption, is quiet when running, and produces very little vibration.
- the unit has generally the same features as other units such as in FIGS. 1-10 , for example, the same fill time.
- FIGS. 16 , 17 , and 18 Another embodiment of the present invention, similar to that shown in FIGS. 11 through 15 , is set forth in FIGS. 16 , 17 , and 18 which feeds enriched oxygen primarily to a patient and secondarily to a buffer tank and then to a radial compressor.
- the embodiments of FIGS. 16 , 17 , and 18 are generally the same as that set forth in FIGS. 11 through 15 as described hereinabove and hereby fully incorporated by reference. It is also to be understood that all pressures in this specification relate to pressures above atmosphere pressure, that is 5 psi is 5 pounds per square inch gauge. In the embodiment of FIGS.
- enriched oxygen from an oxygen or product storage tank is fed through two different outlets or lines, one line directed to the patient and the other line connected to a buffer tank.
- the buffer tank flow line contains oxygen-enriched gas at a pressure generally that of the storage tank whereas the patient flow line feeds the oxygen-enriched gas at a reduced, low pressure to the patient.
- the apparatus utilizes two different and independent compressors, an initial compressor for compressing air and feeding it to molecular sieves for enriching or concentrating to a high amount of oxygen by volume and a second compressor, which operates independently of the first, for compressing the oxygen-enriched gas to a very high pressure for delivery to a high pressure storage cylinder. That is, the second, e.g.
- a radial, compressor is operated by a power source, e.g. a motor, engine, other than by the oxygen enriched gas as compresses by the first compressor (such as in a pressure intensifier).
- a power source e.g. a motor, engine
- the oxygen enriched gas as compresses by the first compressor (such as in a pressure intensifier).
- the embodiment of FIGS. 16 through 18 prioritizes the oxygen-enriched gas so that flow is always continuous to the patient and optional to the buffer tank.
- Initial or concentrator compressor 1205 receives air from the atmosphere and through flow line 1207 feeds it to oxygen concentrator 1210 .
- the concentrator can be any conventional or standard concentrator known to the art and to the literature, or as described hereinabove. Such a concentrator is commercially available from Invacare Corporation, Elyria, Ohio as models 5LX and 5LX02.
- oxygen concentrators through the use of molecular sieves, enriches the oxygen to a desirable level such as at least about 50% or 75%, desirably at least about 80%, and preferably at least about 85% or 90%, more preferably about 93% by volume plus or minus 3%.
- the oxygen-enriched gas is fed through product tank flow line 1215 to oxygen product storage tank 1220 .
- Pressure in the storage tank is generally the same as generated by the oxygen concentrator and can vary as from about 15 to about 20 or 22 psi.
- Storage tank 1220 primarily acts as a holding tank for feeding the oxygen-enriched gas to the patient but also provides oxygen-enriched gas to a buffer tank which then is fed to a second independent compressor, which operates independently of the oxygen concentrator compressor, and subsequently to a high-pressure storage cylinder.
- pressure regulator 1225 Integral with oxygen storage tank 1220 , is pressure regulator 1225 which serves to reduce the oxygen-enriched gas to any desirable pressure for flow to patient flow meter 1235 through patient flow line 1230 . Accordingly, the pressure regulator emits oxygen-enriched gas from the product storage tank to a first outlet such as line 1230 at a reduced or low pressure. While pressure regulator 1225 can be located on or in any portion of the storage tank, it is conveniently an integral part of the storage tank lid or cap.
- concentrated or oxygen-enriched gas within the product storage tank before exiting the same is fed to the pressure regulator 1225 which reduces the pressure to a desirable predetermined low pressure such as from about 3 or 4 to about 10 psi with a desired pressure being about 4 to about 6 or 8 psi and preferably about 5 psi.
- the oxygen-enriched gas is then fed to patient flow meter 1235 where, as in the prior embodiments, it can be adjusted to any flow rate such as from about 0.1 or 1.0 to about 3, 5, or 6 liters per minute.
- Flow meter 1235 can be adjusted by a patient, or by a physical therapist or other medical personnel.
- An oxygen sensor can be located either within oxygen concentrator 1210 or, as shown, on patient flow line 1230 as oxygen sensor 1233 .
- the sensor measures the level of the oxygen by volume in the gas and if it is below a predetermined range, a safety warning such as by a light, buzzer, etc. is activated warning the patient or user of the low oxygen-enriched gas value. This prevents a patient from utilizing the oxygen concentrator if the oxygen value is too low.
- the sensor when located on patient flow line 1230 , the sensor also monitors the level of the oxygen in the gas to ensure that the concentration is above a predetermined value. Otherwise, a safety warning such as a light, buzzer, etc. is activated to warn the patient of low oxygen condition.
- An independent or separate second outlet feeds oxygen-enriched gas from the oxygen or product storage tank to buffer tank 1240 through buffer tank flow line 1245 .
- the pressure of the oxygen-enriched gas of the second outlet is independent of and is greater than the low pressure of the first outlet and generally is at the pressure of product storage tank 1220 .
- the moderate pressure in buffer flow line 1245 is from about 10, 12 or 15 to about 20 or 22 psi.
- Flow restrictor 1249 located in buffer tank flow line 1245 serves to limit the flow of the oxygen-enriched gas so that a sufficient amount is generally always available for the patient and the remaining amount, which often is small, is fed solely to the buffer tank, etc.
- Flow line 1245 also contains an oxygen sensor 1248 which continuously monitors the concentration of the oxygen.
- the concentration of oxygen to the buffer tank is maintained at a predetermined level or set point, typically 93% oxygen by volume plus or minus 3%. If sensor 1248 detects a value lower than the predetermined set point, the electronics of the apparatus are designed to shut off compressor 1250 . Stopping the radial compressor permits the oxygen concentrator to process air at a slower rate thus resulting in an increased oxygen concentration or purity so that the predetermined oxygen concentration such as about 93% oxygen by volume can once again be quickly achieved.
- FIG. 16 The right-hand side of FIG. 16 relating to the buffer tank, the compressor and the high pressure storage cylinder, etc. is further detailed in FIG. 17 .
- Buffer tank 1240 acts as a holding tank for the oxygen-enriched gas which is fed to compressor 1250 via line 1255 .
- compressor 1250 can be any conventional compressor as opposed to a pressure intensifier, it preferably is a radial compressor as described hereinabove and accordingly fully incorporated by reference, wherein like numbers describe like parts.
- the oxygen-enriched gas is compressed in stages until a suitable end stage emits the oxygen at a pressure for storage in high pressure storage cylinder 1260 .
- pressure switch 880 will automatically turn off compressor 1250 .
- Pressure gauge 835 also exists as a visual indication of the amount of pressure in cylinder 1260 .
- Check valve 885 prevents oxygen-enriched gas from flowing out of the high cylinder 1260 whenever the compressor is not being operated.
- burst disk 884 is provided should for some reason the automatic high pressure switch 880 not turn off compressor 1250 at a predetermined high pressure level.
- the pressure of high pressure storage cylinder 1260 can be any desired or predetermined pressure. While the desired pressure of cylinder 1260 is approximately 2,000 psi, it can range from about 500 to about 4,000 and desirably from about 1,500 to about 3,000 and preferably from about 1,900 to about 2,100 psi.
- FIGS. 16 and 17 The advantage of the embodiment of FIGS. 16 and 17 is that independent and different pressures from the product storage tank can be utilized with the pressure component fed to the buffer tank second compressor-etc. being greater and independent of the component fed to the patient.
- the second or radial compressor 1250 operates independently of compressor 1205 which feeds air to the oxygen concentrator.
- controller 1100 preferably is a microcontroller, but can be, for example, a microprocessor with associated memory and input/output circuitry, an application specific integrated circuit, a field programmable gate array, or other suitable programmable device.
- Controller 1100 receives inputs from oxygen sensor 1233 or the concentrator oxygen sensor, and high pressure switch 880 and provides outputs to the compressor 1250 and the indicators 1102 , 1104 , 1106 , 1108 , 1110 .
- the controller 1100 may also, for example, incorporate the previously mentioned control means 50 .
- the indicators 1102 , 1104 , 1106 , 1108 , 1110 may be, for example LEDs, light bulbs, an LCD screen, or other suitable indicators, including, for example, audible indicators.
- the FULL indicator 1102 , the WAIT indicator 1104 , the FAULT indicator 1106 and the TEST indicator 1108 will come on for a short time (e.g., 1 second) to provide an indication that these indicators are functioning. Then the indicators 1102 , 1106 , 1008 will go off.
- the WAIT indicator 1104 will remain on long enough for the oxygen sensor 1233 or the concentrator oxygen sensor to reach operating temperature (e.g., 3.0 minutes).
- the controller 1100 also monitors the heater current and voltage and the output current voltage of the oxygen sensor 1233 or the concentrator oxygen sensor whenever device 1200 is turned on. If a fault in the oxygen sensor 1233 or the concentrator oxygen sensor is detected at any time, the WAIT indicator 1104 is flashed at a one second rate, the FAULT indicator 1106 is activated and all other indicators are deactivated. In this state, the compressor 1250 and the test mode function will not operate.
- the compressor 1250 will run and the FILLING indicator 1110 will be activated. If the high pressure switch 880 is activated, the FULL indicator 1102 will be activated, the FILLING indicator 1110 will be deactivated and compressor 1250 will be deactivated by the controller 1100 .
- oxygen sensor 1248 detects an acceptable predetermined level of oxygen
- radial compressor 1250 will be allowed to operate. However, should oxygen sensor 1248 detect an amount of oxygen below a predetermined level, the controller will automatically close down or stop the operation of radial compressor 1250 . After the oxygen concentration is increased to above the predetermined level, radial compressor 1250 will once again allow it to be operated.
- the FAULT indictor 1106 will be flashed at a one second rate by the controller 1100 and the device 1200 must be reset to operate.
- the test mode operation is based upon a value of pressure being present in a test fitting. If the pressure of the gas stream at the test inlet is greater than some predetermined value, then the controller 1100 should temporarily suspend any operation of the radial compressor and then wait a predetermined time (typically 30 sec.) for the gas values to stabilize. Once the timeout period is over, the controller then uses oxygen sensor 1248 to determine whether the feed gas used by the radial compressor for filling the high pressure tank is above a predetermined concentration value.
- test mode The operation of the test mode is basically the same whether or not the unit enters or exits the test mode. There is always a delay to make sure the gas stream is within the requirements of the minimum values of oxygen concentration for filling the high pressure tank or testing the gas value in the test mode. This delay is included to make sure the gas stream reaches full value with any change in sources of the gas within the internal plumbing of the system.
- test mode The operation of the test mode is basically the same whether or not the unit enters or exits the test mode. There is always a delay to make sure the gas stream is within the requirements of the minimum values of oxygen concentration for filling the high pressure tank or testing the gas value in the test mode. This delay is included to make sure the gas stream reaches full value with any change in sources of the gas within the internal plumbing of the system.
- FIGS. 19 through 23 An alternative compact compressor 700 is shown in FIGS. 19 through 23 wherein the motor, drive wheels and drive belt assembly is similar to that shown in FIGS. 7 and 8 .
- Motor 701 contains a shaft 702 which through first drive belt 703 is connected to first drive wheel 705 having first drive shaft 708 .
- the drive wheel contains a plurality of grooves and projections to receive drive belt 703 , which respectively includes corresponding projections and grooves.
- First drive shaft 708 is connected to hub gear 710 .
- second drive belt 713 is utilized which has a plurality of projections and grooves which engage, respectively, grooves and projections of second drive wheel 715 .
- Second drive wheel 715 is connected to second drive shaft 718 .
- motor 701 which generally can be any conventional electric motor capable of rotating at any desirable speed, for example, at about 1,600 or 1,700 RPM, with drive wheel 705 having hub gear 710 and second drive wheel 715 having second drive shaft 718 , a double reduction of the rotational speed of the motor is achieved.
- the reduction ratio of the motor shaft speed to the first drive wheel or shaft 708 thereof and the reduction from the first drive shaft 708 to the second drive wheel and shaft 718 thereof can be any desirable value depending upon the diameter of the various drive wheels and hub shafts.
- the first reduction is approximately a ratio of 6:1 so first drive shaft 708 rotates at about 265 to about 285 RPM.
- the reduction ratio between the first drive shaft 708 or offset gear and the second drive shaft 718 is also approximately 6:1 so that the second drive shaft rotates at approximately 44 to about 48 RPM.
- both drive belts 703 and 713 can pass over spring loaded idler arms which apply a small amount of tension thereto and ensures tension between the various connective shafts or drive wheels.
- a toothed belt gear drive, etc. can be utilized which engages teeth located on the various drive wheels and hubs.
- the compact compressor assembly 700 can generally contain any number of compression stages such as cylinders and pistons but desirably contains three as shown.
- the first piston desirably is a wobble piston which is connected in series with two sequential cylindrical pistons for compressing the oxygen enriched gas or other gas to a generally predetermined pressure.
- wobble piston assembly 730 as seen in FIGS. 19 and 22A , it contains wobble piston 732 having a relatively large diameter head 733 thereon, which is fixedly connected by connecting rod 734 to base 735 having aperture 737 therein.
- the wobble piston is operated by first drive shaft 708 by means of offset cam 721 which has an offset shaft 722 extending therefrom. Offset shaft 722 engages wobble base aperture 737 to reciprocate the wobble piston.
- wobble piston 732 Since there is no pivot point in the vicinity of wobble piston head 733 , as shaft 708 rotates wobble piston 732 will reciprocate in a longitudinal direction and at the same time wobble. That is, the top portion of the piston head or face will longitudinally proceed or recede the center point of the piston head due to offset cam shaft 722 .
- the wobble piston assembly will compress enriched oxygen received from product tank 30 or the buffer tank 200 and compress it in piston cylinder 740 when received from cylinder manifold head 742 .
- the compact multi-stage compressor of the present invention can have more than one wobble piston assembly, although one is preferred. It can also have more than two cylinder piston assemblies, although two are preferred. As shown in FIG. 19 , the second and third piston assemblies 750 and 770 are generally offset longitudinally aligned and operatively connected to second drive shaft 718 so that as the gas, such as enriched oxygen, is being compressed in one cylinder, the gas in the other cylinder is being drawn therein. Second drive shaft 718 has an offset cam 726 located at the end thereof which cam contains offset cam shaft 727 to which both piston assemblies 750 and 770 are connected.
- Second piston assembly 750 contains piston head 753 , which is pivotally connected through a wrist pin, not shown, to connecting rod 754 .
- Base 755 of the connecting rod through an aperture is pivotally connected to offset drive shaft 727 .
- the piston reciprocates within second cylinder 760 which contains cylinder manifold 762 to admit and release the oxygen or gas from the cylinder. Upon compression of the oxygen or gas in the second cylinder, it is transferred to the third piston assembly 770 via line 787 .
- third piston assembly 770 contains piston head 773 , which through a pivotal wrist pin, not shown, is connected to connecting rod 774 .
- Connecting rod base 775 has an aperture therein which pivots about offset drive shaft 727 .
- the piston assembly is contained within third cylinder 780 .
- Cylinder manifold 782 receives enriched oxygen or gas via transfer line 787 from the second cylinder and after compression thereof; the compressed oxygen or gas is transferred by line 789 to a high-pressure storage container such as a bottle cylinder 820 .
- the piston rings of the second piston head 753 are shown in FIG. 22B , enlarged for clarification, and contain a first annulus 791 which has U-shaped seal 792 therein.
- a tension coil spring 793 resides within the U portion of the seal and serves to force the seal radially outwardly against the walls of the cylinder.
- the base of the seal 794 extends radially outward to further effect a seal with the cylinder wall.
- a second annulus 796 contains a glide ring 797 therein which is forced outwardly against a cylinder wall by coil spring 798 .
- the third piston head is similar to the second piston head but the two seals are separated from each other by connecting rod 774 as seen in FIG. 12C .
- a first annulus 801 has a U-shaped seal 802 therein containing tension coil spring 803 which forces the seal radially outward against the piston wall.
- base 804 of the first seal extends radially outward against the cylinder wall.
- a second annulus 806 in the piston head contains glide ring 807 which is forced radially outward against the cylinder wall by coil tension spring 808 .
- the configuration of the seals of the second and third pistons help maintain a tight seal during operation assuring that compression is not lost.
- the compact and lightweight compressor assembly 700 can achieve any desirable final pressure (e.g., from about 500 to about 3,000 PSI) such as that required for a compressed gas container and especially a compressed oxygen enriched bottle for use by a patient. In the embodiment shown and described, a final pressure of approximately 2,000 PSI is often preferred. Accordingly, wobble piston 732 , while having a short stroke but a large piston head, generally receives enriched oxygen from product tank 30 or buffer tank 200 through a restrictor at any desired pressure such as about 10 PSI and compresses it to about 60 PSI.
- any desirable final pressure e.g., from about 500 to about 3,000 PSI
- a final pressure of approximately 2,000 PSI is often preferred.
- wobble piston 732 while having a short stroke but a large piston head, generally receives enriched oxygen from product tank 30 or buffer tank 200 through a restrictor at any desired pressure such as about 10 PSI and compresses it to about 60 PSI.
- an accumulator tank 785 between the first piston assembly and the second piston assembly 750 to store up the compressed gas produced by the wobble piston inasmuch as it reciprocates approximately six times for every one reciprocation of the second and third pistons.
- This tank can be a conventional tank such as a cylindrical tank, or desirably it can be in the form of a long thick but wide hose 785 .
- Compressed gas from the wobble piston assembly which is operated by first power source 705 , is transferred to second cylinder manifold 762 , where it is compressed by the second piston, operated by second drive shaft 718 , to a pressure of approximately 400 PSI. From there it is transferred via line 787 to the input of third cylinder manifold 782 whereupon it is compressed by the third piston, which also is driven by second drive shaft 718 , to a pressure of approximately 2,000 PSI.
- each subsequent piston head is generally decreased. It is to be understood that generally any desirable head diameter can be utilized.
- the diameter of the wobble piston is generally about 1.8 inches.
- the diameter of the second piston head can be approximately 0.875 inches, whereas the diameter of the third piston head is approximately 0.25 inches.
- the second and third pistons can have a stroke of approximately 1.25 inches, whereas the wobble piston can have a stroke of approximately 0.375 inch.
- the embodiment of FIG. 19 through 23 also contain check valves, generally before and after each cylinder, to prevent the oxygen enriched gas from being pushed backwards into the preceding cylinder or into the product or buffer tank.
- An advantage of the compressor of FIGS. 19-23 is that it generally is compact and small, approximately 1 ⁇ 3 the size of the embodiment of the compressor shown in FIG. 8 , and also approximately 1 ⁇ 3 the weigh thereof, so that it can weight only about 40 pounds. Due to the compactness of the alternative compressor, it can be mounted directly or on top of the oxygen concentrator or it can be made an integral part thereof.
- Bottle cylinder or high pressure storage container 820 can generally be of any size and contain any pressure although the above noted pressure of approximately 2,000 PSI is desirable.
- a small bottle of approximately 62 cubic inches can last a patient for approximately two hours. This time can be extended to approximately six hours when utilized in conjunction with a conserving device.
- a large tank of approximately 283 cubic inches can generally last a patient for approximately eight hours or approximately twenty-four hours when utilized with a conserving device.
- Manifold block 810 is located between third piston assembly 770 and bottle 820 .
- the manifold block contains pressure gauge 812 and a high pressure switch which, as explained herein below, turns off the compressor once a predetermined pressure is achieved.
- the manifold also contains a ruptured disc, not shown, as a safety backup should the pressure to the bottle become too high.
- the manifold block also contains a bleed-off valve, not shown, which gradually releases the pressure built up in compressor assembly 700 as well as line 789 so that a loud abrupt pressure release noise is not caused.
- Bottle 820 also contains a ruptured disc thereon, not shown, which is set to rupture at a pressure higher than that of the manifold rupture disc.
- the bottle can also contain a pressure gauge 822 .
- the compact compressor 700 can be utilized in the same manner as before, that is in association with an oxygenator and with various flow schemes, designs, etc., whether prioritized to insure that a patient receives a required amount of the oxygen enriched gas, or not prioritized. Accordingly, the flow diagrams of FIG. 2 , 3 or 4 , can be utilized but it is to be understood that generally any other flow system can also be utilized to route the enriched oxygen from product tank 30 either directly, or indirectly, etc., to the buffer tank and to compact compressor 700 .
- FIG. 23 An example of electrical circuitry which can be utilized to operate compact compressor assembly 700 is shown in FIG. 23 .
- Mains power (line voltage) is supplied through a three conductor grounded line cord.
- the hot side of the mains power is connected to a resettable thermal circuit breaker.
- the output lead of the circuit breaker feeds the mains power on/off switch.
- the neutral side of the mains power is supplied to one side of the High Pressure switch PRS 2 , Low Pressure switch PRS 1 , the “Run” light L 1 , hour meter HM 1 , and the compressor motor M 1 .
- K 2 is energized, supplying power to the hour meter and the compressor motor.
- the motor relay will cycle on and off by the low pressure switch if the inlet pressure goes above or below the switch setpoint.
- PRS 2 will activate, removing neutral power from the coil of latching relay K 1 and lighting the “Full” light L 2 . This will remove power from the K 1 coil, causing the latching and motor relays K 1 and K 2 to be de-energized, stopping the compressor motor and turning off the “Run” light L 1 .
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Abstract
Description
- This application is a divisional of U.S. patent application Ser. No. 11/938,551, filed Nov. 12, 2007, now U.S. Pat. No. 8,123,497, for Apparatus for Compressing and Storing Oxygen Enriched Gas, which is a divisional of U.S. patent application Ser. No. 11/180,395, filed Jul. 13, 2005, now U.S. Pat. No. 7,294,170, for Apparatus for Compressing and Storing Oxygen Enriched Gas, which is a continuation of U.S. patent application Ser. No. 10/605,754, filed Oct. 23, 2003, now U.S. Pat. No. 6,923,180, for Oxygen Conserving Device Utilizing a Radial Multi-Stage Compressor for High-Pressure Mobile Storage, which is a continuation of U.S. patent application Ser. No. 09/952,763, filed Sep. 14, 2001, now U.S. Pat. No. 6,805,122, for Oxygen Conserving Device Utilizing a Radial Multi-Stage Compressor for High-Pressure Mobile Storage, which is a continuation-in-part of U.S. patent application Ser. No. 09/695,612, filed Oct. 24, 2000, now U.S. Pat. No. 7,204,249, for Oxygen Conserving Device Utilizing a Radial Multi-Stage Compressor for High-Pressure Mobile Storage, which in turn is a continuation-in-part of pending U.S. patent application Ser. No. 09/154,442, filed Sep. 16, 1998, now U.S. Pat. No. 6,302,107, for Apparatus and Method for Forming Oxygen-Enriched Gas and Compression Thereof for High Pressure Mobile Storage Utilization, which in turn is a continuation-in-part of U.S. patent application No. 08/942,063, filed Oct. 1, 1997, now U.S. Pat. No. 5,988,165 for Apparatus and Method for Forming Oxygen-Enriched Gas and Compression Thereof for High Pressure Mobile Storage Utilization, the entire disclosures of which are fully incorporated by reference herein.
- 1. Field of Invention
- The present invention relates to an apparatus and process for conserving enriched oxygen which is subsequently collected under high pressure in a portable container for ambulatory patient use and to permit facile patient mobility. A multi-stage radial compressor is utilized to pressurize the desired gas. The enriched oxygen is fed at a reduced pressure from a product storage tank to a patient, and at the storage tank pressure to generally a buffer tank and subsequently to a radial compressor.
- Heretofore, oxygen concentrators have been utilized to supply patients with a gas having a high oxygen concentration for extended periods of time. Oxygen concentrators typically produce a breathable gas containing from about 80 percent to about 96 percent oxygen from atmospheric air and thus have been widely utilized in the home health care field.
- U.S. Pat. No. 4,627,860, to Rowland, relates to a microprocessor and cooperating means for monitoring or sensing functions and performance of various components of the concentrator. A test apparatus having means for selecting any of the functions monitored by the microprocessor is connected to the concentrator and displays the selected monitored functions for diagnosing performance levels and component problems or failures.
- U.S. Pat. No. 5,071,453, to Hradek et al. relates to an oxygen concentrator which is intended for aircraft use. A booster compressor is used to increase the pressure of the product gas from the concentrator in order to increase the amount of the gas which can be stored in a plenum. The booster includes two moving pistons which are rigidly linked together and a series of check valves which control the flow of gases through the compressor. One of the pistons is driven by air from the rotary valve in the concentrator, and the other piston compresses the product gas for delivery to the plenum. A small sample of concentrator product gas is monitored by an oxygen sensor for oxygen concentration. Once the oxygen concentration has reached an acceptable level, the booster compressor fills the plenum with product gas. Thereafter, if the oxygen concentration of product gas delivered to the crew from the concentrator falls below the concentration which is required at a particular altitude, the product gas stored in the plenum is delivered to the crew. The oxygen sensor monitors the concentrator output product gas to the breathing regulator when the stored plenum gas is not being used.
- U.S. Pat. No. 5,354,361, to Coffield, relates to a pressure-swing adsorber system including a pneumatically driven booster compressor to increase the pressure of the output product gas. A pair of inlet valves controls feed air flow to the sieve beds and the drive cylinder of the booster compressor and are cycled so that one valve opens to pressurize one sieve bed before the other valve closes to allow the other sieve bed to vent to atmosphere. During the time that both valves are open, the pressure in the two sieve beds and on opposite sides of the drive cylinder equalize and a portion of the gas in the pressurized sieve bed and drive cylinder side is captured rather than being vented to ambient. System efficiency is increased by selecting whether captured gas from the last pressurized sieve bed or drive cylinder side reaches the next to be pressurized sieve bed first.
- U.S. Pat. No. 5,858,062, assigned to Litton Systems, Inc., relates to an apparatus for providing oxygen-enriched air at a first pressure and at a second pressure, the second pressure being greater than the first pressure. The apparatus comprises, in combination, a pressure swing adsorption system and a pressure intensifier. The pressure swing adsorption system for enriching the oxygen content of air has a pressure of at least the first pressure. The pressure swing adsorption system is adapted to provide oxygen-enriched air to a first outlet at the first pressure and to provide oxygen-enriched air to a pressure intensifier at the first pressure. The pressure intensifier pressurizes the oxygen-enriched air and provides the oxygen-enriched air to a second outlet at the second pressure.
- It is an aspect of the present invention to provide a method and apparatus for storing high-pressure, high-purity oxygen in a pressure vessel for use in the home health care or related fields as for ambulatory patients, persons confined to wheelchairs, and those who are bedridden.
- In accordance with the invention there is provided a method and apparatus for producing from air an oxygen-enriched gas and initially storing the same in a concentrator product tank. At least a portion of the oxygen-enriched gas is fed by different methods as to an optional but desired compressor buffer tank where it is stored. After reaching a predetermined pressure, the gas is fed to a compressor where it is compressed to a high pressure and stored in a mobile or portable high-pressure container. A patient can thus have increased mobility through use of the portable, one or more high-pressure oxygen containers, which can be filled in one's own home.
- It is a further aspect of the invention to provide circuitry to assure prioritization of the flow rate and concentration of the enriched gas to a patient. The excess gas, when available, is simultaneously delivered to an independent, multi-stage compressor.
- In accordance with another aspect of the invention there is provided a home health care oxygen concentrator for physically separating molecules of oxygen from air with oxygen in a subsequent operation being fed to a high-pressure vessel. The concentrator comprises one or more molecular sieve beds containing a physical separation material, a first (i.e., feed stock) compressor to provide a feed source of compressed air, control means which regulate the product gas flow through the beds to a concentrator product tank, a second enriched-gas storage tank (e.g., a buffer tank), and a second compressor, e.g., multi-stage, which is not operated by the first compressor but operates independently thereof and enables the oxygen-enriched gas to be compressed and fed to a high-pressure vessel or container.
- In a further embodiment, a radial compressor can be utilized to compress oxygen from an optional but desired buffer tank connected to an oxygen source. The radial compressor has pistons radially arranged around a central drive shaft and compresses the oxygen to a high pressure and stores the same in a compact storage cylinder. This design is more compact and less bulky than typical linear designed compressors, and allows the compressor to be housed in a relatively small unit which is thus more easily transportable. An oxygen sensor determines whether a required minimum oxygen concentration is being supplied to a patient and if not, terminates the flow of compressed oxygen to the cylinder, while maintaining the flow to the patient.
- Still another embodiment relates to an oxygen storage tank which operatively feeds oxygen-enriched gas to a patient and which also independently and operatively feeds enriched oxygen at a different and generally greater pressure to a buffer tank where subsequently it is compressed by a compressor, independent of an initial compressor for feeding air to the molecular sieves.
-
FIG. 1 is a block diagram of an oxygen concentrator for separating oxygen from a gaseous mixture such as air; -
FIG. 2 is a block diagram of an apparatus and process in accordance with the present invention for compressing oxygen-enriched air and feeding it to a portable container; -
FIG. 3 is a block diagram of the apparatus and process of the present invention for feeding a portion of enriched gas at a controlled rate to a patient and another portion of the enriched gas to a compressor for high-pressure storage in a portable container; -
FIG. 4 is a block diagram of the apparatus and process of another embodiment of the present invention for feeding a portion of enriched gas at a controlled rate to a patient and another portion of the enriched gas to a compressor for high-pressure storage in a portable container; -
FIG. 5 is a schematic showing one portion of a control circuit for operating a multi-stage compressor of the present invention; -
FIG. 6 is a schematic of the remaining portion of the control circuit ofFIG. 5 for operating a multi-stage compressor of the present invention; -
FIG. 7 is a side elevational view of the compression apparatus of the present invention; -
FIG. 8 is a top plan view of the compression apparatus of the present invention; -
FIG. 9 is a side elevational view of the upper portion of the two-part piston assembly of the present invention; -
FIG. 10 is a side elevational view of the bottom portion of the two-part piston assembly of the present invention; -
FIG. 11 is a top plan view of a radial compressor of the present invention; -
FIG. 12 is a perspective view of the radial compressor ofFIG. 11 showing inlet and outlet connections of the compression cylinders; -
FIG. 13 is a perspective view of the portable high pressure oxygen conserving device of the present invention; -
FIG. 14 is a mechanical and quasi-electrical schematic of the radial compressor and the flow system of the present invention; -
FIG. 15 is a block diagram of the electrical circuitry of the invention including an oxygen concentration test mode aspect; -
FIG. 16 is a block diagram of the apparatus and process of the preferred embodiment showing the general flow at different pressures of oxygen-enriched gas from an oxygen or product storage tank to a patient as well as to eventually a compressor for compression and delivery to a high pressure, portable, storage cylinder; -
FIG. 17 is a detailed view of the embodiment shown inFIG. 16 , including the buffer tank, compressor and high pressure cylinder; -
FIG. 18 is a detailed view of the embodiment shown inFIG. 16 , including a controller apparatus; -
FIG. 19 is a top plan view of an alternate embodiment compressor apparatus of the present invention; -
FIG. 20 is a front elevational view of the alternative compression apparatus shown inFIG. 19 ; -
FIG. 21 is a rear elevation view of the alternative compression apparatus shown inFIG. 19 ; -
FIG. 22A is a partial plan view of a first piston of the present invention; -
FIG. 22B is an enlarged partial elevation view of the second piston of the present invention; -
FIG. 22C is an enlarged partial elevation view of the third piston of the present invention; and, -
FIG. 23 is an electrical schematic of the various circuits for controlling the compact compressor. - While a preferred embodiment of the invention is described hereinbelow, it is to be understood that the various aspects and parameters of the present invention can vary and be different such as the pressure and purity of the oxygen-enriched gas exiting from a concentration product tank, the pressure at which the enriched gas is fed to the patient and its flow rate, the pressure maintained in a buffer tank, the pressure at which the compressor initially draws enriched gas from the buffer tank, the buffer tank pressure at which the compressor shuts off, and the like. Moreover, while reference is made to a particular oxygen concentrator as set forth immediately below, generally any type of oxygen concentrator can be utilized which yields a source of enriched air containing anywhere from about 50 percent oxygen up to about 99 percent by volume.
- With reference to
FIG. 1 , the apparatus includes one or more, and preferably twobeds - A cross-over valving means 20, which preferably includes a four-
way valve 21, selectively and cyclically connects the inlet end of two beds, one at a time, during a production phase with a source of the gas mixture, e.g., air under pressure supplied from a first compressor 22 (i.e., the feed compressor), while the other bed is vented to atmosphere during a purge phase. Specific to the preferred embodiment, the cross-over valving means selectively connects one of the beds in fluid communication with an air pump orcompressor 22 which supplies air from about 15 to about 21 psi. As used herein, “fluid communication” refers to means allowing flow of the appropriate gases. Of course, vacuum can also be used during the purge phase with the present invention to enhance evacuation.Compressor 22, which receives air from inlet 23, is connected to afirst drive motor 25, in the preferred embodiment about a ¼-horsepower electric motor. A solenoid (not shown) or other cross-over valve actuating means selectively causes the cross-over valving means to move alternately between first and second positions. In the first position, thefirst bed 10 is connected withcompressor 22 to cause nitrogen adsorption and oxygen enrichment in the product gas, and thesecond bed 12 is vented to atmosphere to allow evacuation. In the second position, the first bed is vented to atmosphere to allow evacuation and the second bed is connected with the air compressor to cause nitrogen adsorption. The invention is described with specific reference to a pressure-swing control. However, it is equally applicable to other methods of sequencing the gas flow through the sieve beds such as a timing-based system. - The composition of the gas in the voids of the zeolite varies from substantially pure primary-product gas at the outlet end, to the ambient gaseous mixture composition at the inlet end. As the gas mixture is introduced through a bed inlet to an adsorbed, gas-free or regenerated bed, an adsorption zone of finite, relatively large size is formed. This adsorption zone is a region of the bed in which the full capacity of the adsorbent to hold the adsorbable components has not been reached. This adsorption zone moves from the bed inlet toward a bed outlet with a velocity significantly less than the superficial gas velocity in the bed. When the adsorption zone reaches the outlet end of the bed, adsorbable components begin to flow through the bed outlet into the nonadsorbable primary product stream. This time is hereinafter referred to as the “breakthrough.” For a given gaseous composition, the breakthrough is defined by the size and configuration of the bed container as well as the packing configuration of the molecular sieve and the flow rate and bed gas pressure. The configuration of the bed is generally cylindrical and the output volume rate can vary from about 0.1 to 6 liters per minute. The breakthrough is the time required for the diffusion reaction as the nitrogen saturates and is weakly bonded to the sieve bed. When breakthrough occurs, primary product-enriched bed gas in the zeolite voids varies from a higher primary product gas concentration at the bed outlet to a lower concentration at the bed inlet. In the preferred embodiment, the primary product-enriched bed gas is about 80 percent primary product at breakthrough. While adsorption is occurring in one bed, the adsorbable components adsorbed by the separation medium of the other bed are purged from the other bed because of the drop in pressure due to atmospheric venting and because of exposure to relatively pure product gas from the first tank.
- The
first bed 10 is connected with a reservoir orproduct tank 30 by way of afirst check valve 32 or other unidirectional valving means. Thefirst check valve 32 permits the primary product gas from thefirst bed 10 to flow into the reservoir orproduct tank 30 vialine 46 when the product gas pressure in thefirst bed 10 exceeds the pressure of product gas in the reservoir orproduct tank 30. The first check valve prohibits the product gas from flowing from the reservoir orproduct tank 30 when the pressure in thefirst bed 10 is lower than the reservoir or product tank. More specific to the preferred embodiment, the check valve imposes a 1.5 psi bias such that flow is only permitted when the pressure in the first bed exceeds the pressure in the reservoir or product tank by 1.5 psi. Thesecond bed 12 is connected with the reservoir orproduct tank 30 by way of asecond check valve 34 or other unidirectional valving means. Thesecond check valve 34 again provides for unidirectional flow of the primary product gas from thesecond bed 12 to the reservoir orproduct tank 30. - A pressure equalization flow path 40 extends between outlets of the first and second beds. A
concentration equalization valve 42 is either open or closed to selectively permit or prevent gas flow through the flow path between the first and second beds. A control means 50 cyclically causes the cross-over valve actuating means (i.e., two solenoids) and theconcentration equalization valve 42 to be operated. The control means periodically and cyclically enables a concentration equalization valve actuator which is also a solenoid. -
Oxygen sensor 43 registers the oxygen concentration of the product gas and can be located in theproduct tank 30. Thesensor 43 communicates a sensed value to the microprocessor (i.e., control means). Similarly, apressure sensor 45 registers the pressure in the product tank and communicates the same to the microprocessor. - The control means causes the cross-over valving means 20 to alternate between its first and second positions for the appropriate period during each cycle segment. A cycle segment can be either the product gas generation cycle or the purge cycle. The cycle duration is selected such that each bed is connected with the source of air for a period of time which is equal to or less than the breakthrough time. The mechanism which triggers the cross-over valving can be based on the pressure, such as a pressure set point or set point range, in the bleed line from the product tank as is used in a pressure-based control cycle, or it can be based strictly on a residence time from the product-producing bed, such as in a timing cycle-based control cycle. In accordance with another embodiment of the invention, the control cycle can utilize variable pressure in order to achieve a residence time within a defined range based upon a projected breakthrough time. In the preferred embodiment, the beds are 3.5 inches in diameter, 15 inches in length, and each contains 6.5 pounds of 5A zeolite.
- The gas mixture is supplied at up to 21 psi of pressure to the first bed. Concurrently, the second bed (i.e., a “used” bed) is vented to atmosphere to cause purging of the nitrogen-enriched molecular sieves. Before the breakthrough time, the concentration equalization valve is opened allowing primary product-enriched gas from the first bed to flow into the evacuated second bed. During the concentration equalization period, one bed is evacuated and the other has just reached the pressure set point which drives flow between the beds. The flow is of high oxygen content so that the first product to pass into the product tank via
line 46 is essentially product gas produced by the oxygen beds. The second bed pressure is product-enriched gas to purge the sieve bed. Before the primary product-enriched gas from the first bed is evacuated through the second bed, the cross-over valving means 20 is actuated to reverse its position. Actuating the cross-over valving means discontinues supplying of the gaseous mixture to the first bed and commences evacuating it and concurrently discontinues evacuating the second bed and commences supplying it with the gaseous mixture. - Subsequent to the actuation of the cross-over valving means, the
concentration equalization valve 42 remains open to continue allowing a purge supply of product-enriched gas to flow into the second bed. This equalizes the concentration of gas which is supplied to the product tank since the cycling is sequenced so that the product gas proceeds from the breakthrough zone to flow into the product tank. Subsequently, the concentration equalization valve closes and terminates the flow of primary-product gas between the beds. In the second segment of the cycle, the pressure in the second bed increases approaching the gas mixture source pressure. Concurrently, the pressure in the first bed decreases approaching atmospheric pressure. Before the secondary product molecules have traversed the second bed, theconcentration equalization valve 42 is opened allowing the primary product-enriched gas in the zeolite voids of the second bed to flow to the first bed. While the primary product-enriched gas is flowing to the first bed, the cross-over valving means is actuated. Actuating the cross-over valving means discontinues the evacuation of the first bed and commences supplying the gaseous mixture and concurrently discontinues supplying the gaseous mixture to the second bed and commences evacuating it. Subsequent to actuating the cross-over valving means, the concentration equalization valve is closed terminating the pressure equalizing flow of the primary product-enriched gas between the beds. The steps are cyclically repeated to provide continuing fractionating of the primary product gas from the mixture. - Referring again to
FIG. 1 , in a preferred embodiment the reservoir orproduct tank 30 maintains a reservoir of oxygen at a minimum pressure of about 14 psi. The oxygen-enriched gas contains from about 50 to about 99 percent, desirably from about 70 to about 98 percent, and preferably from about 84 to about 96 percent by volume of oxygen. In accordance with conventional procedures,product tank 30 can be connected to a pressure regulator (not shown) for controlling the pressure of the oxygen to a patient. Typically a pressure of 5 psi is utilized. A flow meter (also not shown inFIG. 1 ) can be utilized to limit the flow rate to the patient such as from 0.1 to about 6 liters per minute with a flow rate of about 3 liters per minute often being utilized. If desired, a humidifier (not shown) can add moisture to the oxygen-enriched gas. The gas is delivered to the patient via tubing and breathing apparatus which can be inserted into the patient's nostrils. - In accordance with other concepts of the present invention, oxygen-enriched gas from an oxygen concentrator such as that described hereinabove can be fed in any variety of methods to a compressor where it is compressed to very high pressure and stored in a portable or mobile container such as a gas cylinder.
- In the embodiment of
FIG. 2 , all of the oxygen-enriched gas is fed to a compressor. A concentrator (not shown but such as described hereinabove) has an oxygen-enrichedproduct tank 30 wherein the pressure can vary as from about 14 to about 21 psi. The oxygen-enriched gas therein is fed vialine 201 to aflow meter 210 at the pressure of the concentrator tank, that is from about 14 to about 21 psi.Flow meter 210 controls the flow rate of the oxygen-enriched gas which is fed vialine 211 tobuffer tank 220 wherein the gas pressure therein can also range from about 14 to about 21 psi. Vialine 221, the predominantly oxygen gas is fed tocompressor 100.Compressor 100, in a manner described below, compresses the oxygen-enriched gas to a pressure of about 2,250 psi and stores it within a mobile orportable cylinder 500. Depending upon the withdrawal rate of the oxygen-enriched gas by the compressor, the feed pressure thereto can range from 21 psi down to a predetermined cut-off pressure such as about 5 or 7 psi whereupon the compressor is automatically shut off by a pressure sensor switch. -
FIGS. 3 and 4 relate to embodiments wherein oxygen-enriched air fromproduct tank 30 of the oxygenator is fed by various methods desirably to a buffer tank of the compressor but prioritized as with regard to oxygen concentration and/or a sufficient pressure. For example, the feed rate to a patient can vary from between 0.1 and 6 liters per minute at a pressure of a predetermined value such as 5 psi with the remaining oxygen-enriched gas generally being fed at a different pressure to the buffer tank. The buffer tank can generally contain a broad range of pressure therein such as, for example, between 14 and 21 psi. However, as noted with regard toFIG. 2 , depending upon the withdrawal rate of the gas in the buffer tank by the compressor, the pressure thereof can drop down to a predetermined cut-off pressure, such as 7 psi, which is higher than the pressure of the gas being fed to the patient to ensure an adequate flow of the oxygen-enriched gas to the patient. - Referring to the embodiment of
FIG. 3 , a 5-psi regulator 210 emits oxygen-enriched gas fromproduct tank 30 intoflow line 220 and feeds the same to flowmeter 230 which subsequently emits the oxygen-enriched gas to the patient at a predetermined flow rate of from 0.1 to 6 liters per minute. Optionally, the flow meter can be closed so that all the enriched oxygen is directed to the compressor. Gas not directed to the patient is carried vialine 240 to two-way valve 250. A very small portion of the gas inline 220 is directed throughline 260 through restrictor 262 into oxygen sensor 265 which detects whether or not the concentration of the oxygen is of a predetermined value such as is at least 84 percent. When the oxygen sensor detects a concentration at or above the predetermined level, two-way valve 250 is open and permits the oxygen-enriched gas to flow throughline 270 intobuffer tank 200 wherein the pressure is essentially the same as the oxygen product tank pressure. However, should the oxygen sensor not detect a suitable oxygen concentration, two-way valve 250 is closed so that the oxygen concentrator can build up a sufficient oxygen concentration. This arrangement prioritizes the flow of oxygen-enriched gas so that the patient is assured of receiving a gas having a minimum oxygen concentration therein.Buffer tank 200 can have aregulator 280 thereon generally set at 12 psi to admit the oxygen-enriched gas to the compressor when needed. Alternatively, the pressure regulator can be set at anywhere from about 13 to about 21 psi. Restrictor 290 controls the flow rate of gas from the buffer tank to the compressor. Should the compressor drop the pressure in the buffer tank to below a predetermined value, a pressure sensor (not shown) will automatically cut off the flow of gas at a pressure above the pressure of the gas being fed to the patient. This prioritization assures that the patient receives priority with regard to oxygen-enriched gas. - The embodiment of
FIG. 4 emits the oxygen-enriched gas through a 14 to about an 18-psi regulator 300 intoflow line 305 havingflow rate restrictor 307. The flow is then split with a portion vialine 310 going through 5-psi regulator 320 and intoflow meter 330 which then directs the gas to the patient at a desired flow rate of generally from 0.1 to 6 liters per minute, although optionally the flow meter can be closed. The remaining portion of the gas is directed vialine 340 to two-way valve 350. A small portion of the gas going to the patient is diverted throughline 365 throughflow restrictor 367 to oxygen sensor 360. As inFIG. 3 , the oxygen sensor is set at a predetermined value such as a concentration of 84 percent so that when the level is not achieved, two-way valve 350 is closed throughelectrical line 355. This aspect allows the amount of oxygen in the concentrator tank to be increased by the oxygenator unit. The same prioritizes the concentration of oxygen to ensure that the patient receives an amount of oxygen of at least the minimum predetermined value. When the oxygen concentration is sufficient, the gas flows through two-way valve 350 intoline 370 and intobuffer tank 200 where it is stored generally at a pressure of about 14 to 18 psi. Arelief valve 385 which can be set at any desired value such as about 14 psi ensures that gas under sufficient pressure is being admitted to the buffer tank. The oxygen-enriched gas is admitted to the compressor vialine 380. Should the compressor withdraw gas faster than it is being received by the buffer tank, the pressure therein will drop. A pressure sensor switch (not shown) can be set to a predetermined value (e.g., about 7 psi) to ensure or prioritize that a sufficient amount or flow of gas is being fed to the patient. The predetermined shut-off pressure of the compressor is always above the pressure of the gas being fed to the patient. The embodiment ofFIG. 4 is preferred. - While the above description, as exemplified by
FIGS. 2 , 3, and 4, generally constitutes a preferred embodiment of the present invention, it is to be understood that the same can be modified. For example,oxygen product tank 30 need not be utilized. Instead, the oxygen-enriched air from an oxygen concentrator, such as shown inFIG. 1 , can be fed to the buffer tank via the shown and described flow lines of the various embodiments such as set forth inFIGS. 2 , 3, and 4. Accordingly, the oxygen-enriched air will be separated with one component directed to the patient and the other component being directed to the buffer tank. Prioritization of the oxygen-enriched gas to the patient either by a minimum oxygen concentration or a sufficient pressure in the buffer tank is still generally utilized. Alternatively, an enrichedoxygen product tank 30 can be utilized and the buffer tank can optionally be eliminated. In other words, enriched oxygen from the product tank can be fed via one component to the patient and to a second component via the flow line shown to the compressor. In this situation, prioritization of the desired flow and oxygen concentration to the patient is maintained as described hereinabove with regard to either the level of oxygen concentration or an adequate pressure being admitted to the compressor. - Referring now to the
compressor assembly 100 as shown inFIGS. 7 and 8 , it generally utilizes an AC electric-drive motor 105 which can rotate at any desired speed, e.g., 1,700 rpm.Motor 105 can contain a fan (not shown) either within the motor housing or immediately adjacent thereto to draw air through the motor to cool the same. Power is conveyed from the motor throughshaft 106 to drivewheel 107. Desirably the drive wheel has a plurality of grooves therein to receive a V-belt such asmain drive belt 109. Such belts are generally reinforced with fiber and have a very long life.Main drive belt 109 is connected tomain gear 110 which contains a plurality ofgrooves 113 therein. The number ofperipheral grooves 113, as well as the size and location thereof, coincides with the grooves ofdrive wheel 107 and matingly engage a plurality of projections located onmain drive belt 109. Extending frommain gear 110 is an offsethub gear 114 which has a much smaller diameter thanmain gear 110.Hub gear 114 also hasgrooves 115 thereon to receive a secondary drive V-belt 122. A second or secondarylarge gear 116 has grooves on the periphery thereof which matingly engage the secondary drive V-belt 122. Offsethub 114 through the secondary V-drive belt 122 contacts and serves to drivesecondary gear 116 which in turn is connected tocrankshaft 130. - Through the utilization of the two
large gears crankshaft 130 is a desirably low speed such as approximately 50 rpm. Bothdrive belts idler arm - The multi-stage compressor of the present invention can have any number of pistons, but in the present embodiment has three. As shown in
FIG. 8 , two of the pistons, i.e., the first and third pistons, are located on the same crankshaft lobe, whereas the second piston is located on a different lobe offset 180 degree. from the first and third pistons. The reason for this is that pistons one and three will be drawing in air when the second piston is being compressed and vice versa. Although not shown, a crankshaft can be utilized which contains three lobes thereon, each offset from one another by approximately 110 degrees to 130 degrees, e.g., about 120 degrees, so as to minimize the torque resistance applied to the motor during the compression stroke. - The compressor of the present invention has three pistons, i.e., piston #1 (131), piston #2 (133), and piston #3 (135). Each piston is contained within a separate cylinder and thus piston #1 is contained within the first cylinder (132), the second piston is contained the second cylinder (134), and the third piston is contained within the third cylinder (136). While the diameter of the
head 140 of the first piston is approximately equal to the diameter of the base portion of the piston as shown inFIGS. 8 and 9 , the diameter of the head of piston #2 (133) is smaller than that of piston #1, and the diameter of the head of piston #3 (135) is smaller than the diameter of piston #2 (133). However, the base of each piston 131B, 133B, and 135B is of the same size for reasons set forth hereinbelow. In order to permitpistons # 2 and #3 to operate properly, each contains an annular sleeve 134S and 136S on the inside of the cylinder wall the internal diameter of which is approximately equal to the external diameter of piston heads #2 and #3 respectively. - Regardless of the size of the piston head, it has two rings as generally indicated in
FIG. 9 . Inasmuch as the rings of all three piston heads are generally the same, only the first piston is shown inFIG. 9 . The piston head has two annular grooves or recesses therein, that istop piston annulus 141 andbottom annulus 144. The top annulus contains a U-shaped seal therein generally made out of a Teflon.®..™. alloy or other low-friction material. The seal contains acoil tension spring 143 therein which forces the seal radially outward against the cylinder wall to prevent compressed air from leaking through the piston head between the piston and the cylinder wall. To also ensure the maintenance of a good seal,seal 142 is U-shaped so that upon the build-up of pressure in the cylinder head, the compressed gas will communicate and enter into the seal and force the outer edge thereof radially outward against the cylinder wall. Pistonhead bottom annulus 144 contains a flat orvertical glide ring 145 which extends around the annulus and is also radially forced outwardly by acoil tension spring 146 located therein. Thebottom glide ring 145 can be made out of a Teflon.®..™. alloy and serves as a piston glide ring. - Connecting rod 148 connects the piston head to
piston base 150. The piston bases of all three pistons are the same diameter and accordingly engage a mating cylinder of essentially the same diameter. The piston base contains anupper base annulus 151 and alower base annulus 155, both of which have a glide ring therein similar to if not identical to glidering 145 ofpiston head annulus 144. Thus,upper base annulus 151 has aglide ring 152 therein which is forced radially outward bycoil spring 153. Similarly,lower base annulus 155 has aglide ring 156 therein which is radially forced out by coil-spring 157. Although three glide rings have been shown and described as being identical, they can be different and use different material, and the like.Piston base 150 containsbore 158 which extends laterally therethrough.Bore 158 receiveswrist pin 159. The wrist pin and coil spring both serve to maintainglide ring 156 in a radially outward position so as to bear against the cylinder wall. - The two-part piston assembly of the present invention contains
bottom connecting rod 160 as shown inFIG. 10 . The connecting rod contains atop bore 161 through whichwrist pin 159 extends. Bottom bore 163 of the connecting rod extends about and matingly engages an appropriate portion of the crankshaft. In order to permit rotation of connectingrod 160 about thecrankshaft 130, sealedportion 164 of the connecting rod contains bearings therein. - The net result of the two-part piston ring assembly of the present invention is that bearing 164 of connecting
rod 160 can freely rotate with the crankshaft in a rotary or circular motion whereastop bore 161 moves in only a linear or reciprocal motion allowing piston rod 148 with the piston head and base thereon to move only in a linear reciprocating direction. The same thus prevents lateral forces from being applied to the cylinder wall which often results in wear and can create an oval-shaped cylinder wall. The two-part piston ring assembly of the present invention thus promotes long life of the piston and cylinder wall. - Although each piston serves to compress the gas admitted therein to a higher pressure, a desirable aspect of the present invention, as noted above, is that each subsequent piston head has a smaller area. For example, piston #1 (131) can have a diameter of approximately 1 ¾ inches, whereas
piston # 2 has a diameter of approximately 1 ¼ inches, andpiston # 3 can have a diameter of approximately ½ inch, which can be the diameter of essentially piston rod 148. Desirably, the increase in pressure from each stage or piston is proportional to the others. The compression ratio of each piston can vary, but generally is the same. Although compression ratios of up to 10 can be utilized, the desirable pressure range is from approximately 6 to about 8. - Inasmuch as heat is built-up during compression of the oxygen-enriched gas, the flow lines between the pistons can be extended so that they are long enough to permit the heat of compression to be absorbed by ambient air and thus cool the enriched pressurized gas therein. As shown in
FIG. 8 , coolingline 182 from the first piston to the second piston can be in the form of an undulating path or the like and the same is true with regard to coolingline 184 between the second and third pistons. - The operation of the compressor portion of the apparatus is as follows.
Electric motor 105 which operates independently of the compressor feeding air to the molecular sieves in the oxygen concentrator portion of the apparatus, throughdrive belts crankshaft 130 thereby causing piston #1, #2, and #3 (131, 133, 135) to reciprocate and compress air in their respective chambers. More specifically, enriched oxygen gas from the compressor buffer tank is fed to the first piston.Piston 131 contains aninlet check valve 172, which permits air to enter the cylinder head space above the piston, andoutlet check valve 173, which permits the compressed gas to exit from the first piston. The check valves permit flow of the gas in one direction so that once the gas is admitted to the first piston, during the compression stroke thereof it cannot be forced back out to the buffer tank. Similarly, once forced out of the first piston,outlet check valve 173 prevents the gas from being sucked in during the intake stroke of the first piston. In a similar manner,second piston 133 has aninlet check valve 175 which permits the compressed air from piston #1 to be drawn into the head space abovepiston 133, but prevents it from being forced back into the first piston.Outlet check valve 176 prevents the gas compressing the second piston from being drawn back into the piston once it has been expelled therefrom. In a similar manner, the gas which has been further compressed inpiston # 2 is fed into piston #3 (135) throughinlet check valve 178 where it is further compressed. The compressed gas is then fed throughoutlet check valve 179 into enriched oxygengas storage cylinder 500.Outlet check valve 179 thus prevents the highly compressed stored gas in the cylinder from being admitted back into the third piston. - During the operation of the compressor, the gas in
portable cylinder 500 which is initially at ambient pressure, is gradually built up to desired pressure. One such suitable pressure is approximately 2,250 psi. Of course, different cylinders can accept either higher or lower gas pressures and readily maintain the same.Rupture disk 180 is a safety feature designed to rupture at a pressure in excess of the desired storage pressure of the gas cylinder. Thus, in the present embodiment, such a pressure can be approximately 2,800 psi. Although not shown, rupture disks can also be provided in the flow lines from the exit of the first and second cylinders to prevent undue build-up in these lines. Apressure regulator 181 serves to emit the oxygen-enriched gas at a pressure of about 5 psi to a patient via a flow meter (not shown) at any desired rate, such as from about 0.1 to about 6 liters per minute. - As previously noted, the buffer tank contains oxygen-enriched gas at a pressure of generally from about 7 or 14 psi to about 21 psi. The compressor is designed to commence compression generally when the pressure in the tank is generally at a maximum until it drops to a predetermined pressure, e.g., 7 or 8 psi. In general, the pressure is electrically controlled by various switches, sensors, relays and the like. Briefly, a master ON/OFF switch emits power to
compressor motor 105 which in turn causes the crankshaft to rotate and compress air. Two pressure-sensitive switches exist: a low pressure sensor which detects pressure below a predetermined value, e.g., 7 to 12 psi, and a high pressure sensor which detects pressure above 2,250 psi. When the low pressure sensor detects pressure below the predetermined level, it will turn offmotor 105 through a relay switch. This allows oxygen inflow from the concentrator to be built-up in the buffer tank to a desired pressure. The low pressure sensor is a-solid-state relay. Should the relay fail, it will fail closed and allow the motor to continue to run. Accordingly, this relay switch is connected in series with the high pressure sensor mechanical relay switch which will shut the motor off when the pressure in the cylinder reaches approximately 2,250 psi. -
FIGS. 5 and 6 show the electrical circuitry of the compressor. Power is fed to the compressor initially through theresettable breaker 600 and then topower switch 610. When the power switch is pushed to the “ON” position, power passes to themotor start switch 620, the start relaycommon contacts 630, and also lights thepower indicator 640. When start switch is depressed, the start relay coil is energized which causes both switches of the relay to close. - One of these closed switches passes the power to
high pressure switch 650 which is normally closed when the output pressure of the compressor is under 2,250 psi. The output of the high pressure switch is fed back to the start relay coil to keep the coil energized without the start switch being depressed, but will cut power to the coil when high pressure is reached. (This occurs when a tank has been filled.) The output of the high pressure switch is also connected to the common oflow pressure switch 660. While the input pressure from the concentrator is above the predetermined value, e.g., 7 psi, the low pressure switch is closed and the normally closed contact has power. This power signal is fed to the drive contact of the solid-state relay which, in turn, allows the solid-state output to be “turned on.” The output of the high-pressure switch is also connected to therun indicator 670 which then lights up. - The second closed switch of the start relay is connected to the “input” of the solid-state relay. When the solid-state relay is turned on by the signal from the low pressure switch, power is passed to
motor 105 and its start capacitors through the solid-state output. A common line is connected to the other side of the motor to complete the circuit. Anhour meter 690 is wired in parallel to the motor to monitor motor run time. - When the above occurs, the motor beings to run and remains running until one of two conditions occur. The first condition would be the input pressure to the compressor falls below a predetermined value, e.g., 7 psi. This will cause
low pressure switch 660 to open and solid-state relay 695 to turn off, which in turn shuts offmotor 105. If the input pressure to the compressor rises above a desired predetermined pressure,low pressure switch 660 will close and once again turn on the solid-state relay and start the motor. This is a normal occurrence that is dependent upon concentrator efficiency and may be repetitive. - The second condition that will shut off the motor occurs when an oxygen tank has been filled. The output pressure will rise above 2,250 psi and therefore cause
high pressure switch 650 to open. This cuts the power to the start relay coil which causes both switches to open and cuts the power to both the input of the high pressure switch and the input to the solid-state relay thereby shutting off the motor. To start the motor after this condition is reached requires startswitch 620 to be depressed. If greater than 2,250 psi remains, the high pressure switch will remain open and no signal will be fed back to the start relay coil to keep it energized therefore causing the motor to remain off. While the high pressure switch is open,run indicator 670 remains off - Any direct shorts between power and common or any condition that draws more than 8 amps of current will cause
resettable breaker 600 to pop open. - As apparent from the above, the operation of
compressor 100 is completely independent of the oxygen concentrator as well as utilization of gas compressed thereby as a power or energy source for the compressor. In other words, the pressure accumulated in the oxygen concentrator is not utilized to drive or operate a pressure intensifier. - A distinct advantage of the apparatus and method for forming oxygen enriched gas and compression thereof according to the present invention is the creation of a mobile or portable source of gas containing high purity oxygen. Patients who require oxygen-enriched gas, as from about 80 to about 98 percent, are no longer confined to the vicinity of an oxygen concentrator as for example a bed, home, hospital, or a wheelchair. Rather, the patient can carry the mobile gas cylinder in any convenient manner, such as in a backpack, and thus can take trips via wheelchair, an automobile, and even planes and trains. Depending upon the pressure and size of the storage cylinder, the oxygen supply can be anywhere from about 2 to about 24 hours or even longer.
- A further embodiment of the present invention relates to an electromechanical oxygen distribution device or system as for use in a home to supply a patient with concentrated oxygen and also to concurrently supply pressurized and concentrated oxygen to a storage cylinder as for a patient's personal ambulatory use. The device is designed to be utilized in association with an oxygen source capable of supplying oxygen at a preferred concentration of at least 85 percent or 90 percent by volume at various pressures such as generally from about 2 to about 20 psig, and desirably from about 2.5 or about 4 to about 10 psig. Sources of concentrated oxygen include an oxygen concentrator as set forth herein above, or, conventional or commercially available oxygen concentrators, such as for example, but not limited to, Mallinckrodt-Aeris 590; Russ ProductsMillienum; Sunrise; and the like. Such concentrators can have various oxygen concentration outputs, pressures, and a desirable flow rates such as at least about 3, 5 or 6 liters per minute.
- The oxygen distribution system or
device 800 has housing 810 as well as oxygentest mode inlet 815, oxygennormal operation inlet 820 for receiving oxygen from a concentrated oxygen source,oxygen outlet 825 for feeding oxygen to a patient,oxygen flow meter 830 for regulating the flow of oxygen to a patient,pressure gauge 835,power switch 840 for turning the compressor unit or device on and off, and fillconnector 845 for connecting the compressed gas togas storage cylinder 1000. - Considering the radial compressor, as seen in
FIGS. 11 and 12 the radial compressor generally utilizes an ACelectric drive motor 905 which can rotate at any desired speed, such as generally from about 500 or 1,000 to about 3,600 or 6,000 RPM, and preferably from about 1,100 to about 1,300 RPM. Generally, the drive motor can be of any horsepower and is desirably from about 1/100 to about ½ horsepower, with 1/12 horsepower most preferred.Drive motor 905 can contain a fan (not shown) within the motor housing or immediately adjacent thereto to draw air through the motor thereby cooling the same. Power is conveyed from the motor throughmotor shaft 906 to drive wheel, not shown, which desirably has a variety of grooves and/or teeth therein to receive a belt such asdrive belt 909. The drive belt can generally be of any suitable composition, such as rubber or reinforced rubber which provides a long service life.Drive belt 909 is connected tocompressor pulley 910 which has a plurality of grooves and/or teeth therein. Optionally, an idler arm (not shown) can be utilized to keep tension on the drive belt.Compressor pulley 910 is connected tocrankshaft 911. Although the present invention is only shown with a single reduction, it is conceivable to add more pulleys and reducing gearing. The single reduction utilized by the present invention is lighter and more compact and contains fewer parts than an assembly utilizing more than one reduction. - The radial multi-stage compressor of the present invention can have any number of pistons, such as from 2 to about 12, desirably from about 3 to about 8 or 10, with about 5 being preferred. As shown in
FIGS. 11 and 12 , the preferred embodiment contains 5pistons crankshaft 911. Each piston is located withinseparate cylinders first piston 915 located infirst cylinder 925, etc. As can be seen inFIG. 11 , the pistons and cylinders or various portions thereof, have different shapes, and sizes, such as diameters, and lengths, in order to facilitate the gradual or step-wise build-up of pressures from the first cylinder through the last or fifth cylinder. For example,first piston 915 andsecond piston 916 have a top and base which are integrally formed from a single element, and generally have the same diameter. Thethird piston 917,fourth piston 918, andfifth piston 919, each have top portions which are smaller than the base portions thereof. Inasmuch as each subsequent piston is located on essentially the opposite side of the housing, the forces exerted on the various pistons by the crankshaft and the expanding air in the cylinders are generally balanced and result in the efficient transfer of energy. Moreover, the radial design results in a lightweight housing, which can be made of aluminum. - The radial compressor is designed so that the volume of gas is reduced, desirably proportionally, in each succeeding piston/cylinder assembly. Thus, as can be seen in
FIG. 11 , thecompressible area 935 of the first piston/cylinder assembly is larger than thecompressible area 936 of the second piston/cylinder assembly, and so on. The compression ratio can generally range from about 1 to about 10, and is preferably from about 2 to about 5, with about 2.5 being most preferred.Motor 905 drivesannular crankshaft 911 which drivesmaster connecting rod 920, as well asslave connecting rods 921 through 924 each operably connected thereto. The crankshaft has an offset thereon to allow reciprocation of the pistons. - The operation of the radial compressor generally is as follows: Drive
motor 905 through,drive belt 909, andpulley 910 rotatescrankshaft 911 and thus operably causes first through fifth pistons 915-919 to reciprocate and compress a source gas in their respective chambers. More specifically, a gas, which is preferably enriched oxygen gas is fed to thefirst piston 915. The gases which are fed or supplied to the radial compressor can be supplied from various sources, herein incorporated by reference, such as molecular sieve oxygen concentrator, a product tank or a buffer tank. Alternatively, gases from liquid or a high pressure oxygen cylinder which is typically too large and heavy to be easily moved, can serve as a source gas which is fed to the compressor. These large cylinders contain a wide range of oxygen therein, such as typically from about 800 to about 900 cubic feet of compressed or liquefied oxygen therein. - The piston/cylinder assemblies in each cylinder head contain conventional check valve members such as ball and spring assemblies such as those set forth in
FIG. 8 which permit a gas to flow in and out of the piston/cylinder assembly in a desired fashion, i.e. one direction. The preferred check valve member of the present embodiment has a spring rated preferably at 2 psi or less. In order to ensure the compressed concentrated oxygen does not flow from a subsequent compression cylinder back into a prior cylinder, each cylinder head assembly will contain two outlet check valves located sequentially with respect to one another as diagrammically shown inFIG. 14 . -
FIGS. 11 and 12 show various fittings and piston head assemblies containing check valves.Inlet check valve 940 of the first piston assembly permits the gas to enter firstcompressible area 935 andoutlet check valves 941 permits the compressed gas to exit the first piston. The check valves permit the flow of gas in one direction so that once the gas is admitted to the first piston, it cannot be forced back out through the inlet check valve during the compression stroke of the piston. Similarly, once forced out of the first piston,outlet check valves 941 prevents gas form being sucked in during the intake stroke of the first piston. In a similar manner,second piston 916 has aninlet check valve 942 which permits the compressed gas from the first piston/cylinder assembly to be drawn into the secondcompressible area 936, but prevents it from being forced back into the first piston.Outlet check valves 943 prevents the gas compressed in the second piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom. - In yet a similar manner,
third piston 917 has aninlet check valve 944 which permits the compressed gas from the second piston/cylinder assembly to be drawn into the thirdcompressible area 937, but prevents it from being forced back into the second piston.Outlet check valves 945 prevents the gas compressed in the third piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom. - In a similar manner,
fourth piston 918 has aninlet check valve 946 which permits the compressed gas from the third piston/cylinder assembly to be drawn into the fourthcompressible area 938, but prevents it from being forced back into the third piston.Outlet check valves 947 prevents the gas compressed in the fourth piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom. - Finally, in a similar manner,
fifth piston 919 has aninlet check valve 948 which permits the compressed gas from the fourth piston/cylinder assembly to be drawn into the fifthcompressible area 939, but prevents it from being forced back into the fourth piston.Outlet check valves 949 prevents the gas compressed in the fifth piston/cylinder assembly from being drawn back into the same once it has been expelled therefrom. As shown inFIG. 14 , appropriate tubing able to withstand high pressures such as metal tubing, connects various parts of the oxygen distribution device such as the various piston/cylinder assemblies, the buffer tank, the various regulators, the storage cylinder, etc., in a conventional manner known to those skilled in the art. - As shown in
FIG. 11 , each sequential piston cylinder assembly is not located adjacent to the next higher pressurizing piston cylinder assembly in a circumferential direction around the compressor, but is staggered or offset from one another by at least one piston cylinder assembly so as to balance the forces on the compressor and the crankshaft. In other words, each succeeding piston cylinder assembly with respect to increasing the pressure of the enriched oxygen from the previous assembly is located at least two assembly positions away in a circumferential direction so that there is desirably at least one intervening piston cylinder assembly between each set or pair of sequentially or succeeding pressure piston cylinder assemblies. - As concentrated oxygen is fed to the radial compressor, the first cylinder will gradually build up a pressure, with the second cylinder gradually building up a higher pressure, etc. until a desirable pressure is reached in
storage cylinder 1000. While the ranges in each cylinder can vary widely, the desired range from the concentrator or other oxygen source as from about 2 to about 20 psig is approximately 34 psig. The second compressor will gradually build up to a pressure of approximately 110 psig with a third compressor gradually building up to a pressure of approximately 300 psig. The fourth compressor will gradually build up to a maximum pressure of about 800 psig whereas the last or fifth compressor will build up to a maximum pressure of approximately 2,000 psig. The above pressures are generally relative for a desired pressure of about 2,000 psig and of course will vary proportionally for a five stage compressor with regard to any other desired end pressure such as about 1,500 psig, 2,500 psig, 3,000 psig, etc. Generally,cylinder 1000 can accept pressures in a range generally from about 500 to about 4,000 psig, desirably from about 1,500 psig to about 3,000 psig, and preferably from about 1,900 psig to about 2,100 psig. - The compressed gas is then fed through
connector check valve 950 into agas storage cylinder 1000 through appropriate tubing, connectors, valves, and the like. These storage cylinders can generally be of any conventional size with standard sizes such as M6, C, D, and E, being suitable. Typically, the gas cylinder can hold a volume of compressed gas in a range generally from about 10 to about 650, desirably from about 50 or 100 to about 400 or 500, and preferably from about 150 to about 250 liters. Desirably, the cylinder has a built in pressure gauge of from about 0 to about 3,000 psig, and is equipped with a self-contained release valve as well as a high pressure rupture disk set for any desirable pressure such as about 6,000 psig. It can also have a hose barb outlet for connection to a patient cannula. - As stated above, the
radial compressor 900 can be substituted directly forcompressor assembly 100, that is in association with an oxygen concentrator, and with various flow schemes, designs, etc., whether preferably prioritized to insure that a patient receives a required amount of oxygen-enriched gas, or not prioritized. Accordingly, the flow diagram ofFIG. 2 , 3, or 4 can be utilized but it is to be understood that generally any other flow system can also be utilized to route the enriched oxygen fromproduct tank 30 either directly or indirectly, etc., toradial compressor 900. - The oxygen distribution system or device of the present invention containing the radial compressor is diagrammically shown in
FIG. 14 . The oxygen distribution device generally comprisesoxygen sensor 860, reservoir orbuffer tank 875, to accumulate or store the concentrated oxygen, the radialmulti-stage compressor 900,high pressure switch 880,pressure gauge 835, output oxygen fitting orconnector 845, portablehigh pressure cylinder 1000. Also included isflow regulator 877 and flowmeter 830. As apparent fromFIG. 14 , the oxygen device also contains a test mode aspect, explained in greater detail hereinbelow, to determine at least the concentration of the oxygen from an oxygen concentrator, a large oxygen cylinder, or other source, before it is connected to the oxygen device. Whileoxygen distribution device 800 is assigned primarily for home use, it can also be used in other institutions such as nursing homes, clinics, hospital rooms, offices, and the like. As noted, the oxygen distribution device can receive various levels of concentration of oxygen such as at least about 50% or 75%, and desirably at least about 80%. However, with respect to the present invention, the oxygen device is generally designed to receive at least about 85%, and preferably at least about 90% oxygen and more preferably about 93% by volume plus or minus 3%. - Once the level of oxygen concentration from the oxygen concentrator, etc., has been determined by the test mode system to meet the predetermined, minimum requirement or level, the oxygen source such as a concentrator is attached to
oxygen inlet 820. From there a small portion is fed tooxygen sensor 860 which continuously monitors the oxygen concentration. The remaining great majority of the oxygen is fed to a reservoir orbuffer tank 875 whereafter it is channeled into two flow streams with a selected or predetermined portion of oxygen such as from about 1 to about 3, 4, or 5 and preferably about 2 liters per minute being fed to the compressor and with a selected or predetermined portion such as from about 0.1 to about 6, desirably from 1 to about 0.5 to about 5, and preferably from about 1 to about 3 liters per minute, flowing to a patient. These two portions naturally add up to the total amount or flow of oxygen from the reservoir ofbuffer tank 875; that is one flow stream such as that to the patient is the difference of the flow stream going to the compressor based upon the total flow or amount of oxygen exiting from the buffer tank. The oxygen distribution system of the present invention is prioritized in that the radial compressor will only run whenoxygen sensor 860 determines that the oxygen concentration is at or above a minimum predetermined level, for example 90% by volume. Thus, should the oxygen concentration drop below the predetermined level during operation of the compressor, sensor 960 will shut off the compressor until the concentration reaches the predetermined level. However, while the compressor is shutoff to build up the oxygen level, the enriched oxygen is continuously fed to the patient. As apparent fromFIG. 14 , the enriched oxygen from the buffer tank passes throughpressure regulator 877 and flowmeter 830.Pressure regulator 877 is set at any desired predetermined pressure level such as anywhere from about 1 to about 5 and desirably about 3 psig. The flow meter can be set by the patient, or by any other competent medical person such as a physical therapist, medical doctor, etc. to a desired flow rate. - The oxygen being fed to the compressor, as previously indicated, goes through a series of compression stages or cylinders with each subsequent stage pressurizing the gas to a higher pressure until finally the last stage achieves the desired indicated pressure whereupon
cylinder pressure switch 880 will turn offcompressor motor 905. As a safety backup,burst disk 884 is provided to prevent an undue buildup of pressure within the storage cylinder. - Generally, the only requirement required by the patient in operating the oxygen distribution device of the present invention is to turn on
power switch 840 and to set flow meter to desired rate as determined by a medical person or the like. - Referring to
FIG. 14 , thedevice 800 may also advantageously include an oxygen concentration testing function. This test mode system includes thetest mode inlet 815. Theinlet 815 communicates with theoxygen sensor 860 through a check valve 854 whose downstream side is in communication with the downstream side of acheck valve 872 that normally passes gas from thenormal mode inlet 820. The downstream sides of thecheck valves 854, 872 are both in communication with aflow restrictor 856 which limits the flow of gas to theoxygen sensor 860. Thecheck valve 872 prevents the flow of gas from thetest mode inlet 815 toward thenormal mode inlet 820. The check valve 854 prevents the flow of gas from thenormal mode inlet 820 toward thetest mode inlet 815. - A
test pressure switch 852 senses the pressure of gas applied to thetest mode inlet 815. Theswitch 852 provides an indication that pressurized gas is being applied to thetest mode inlet 815. Theswitch 852 may, for example, be actuated by a gas pressure of 2.1 psi or greater. - Upon indication of pressurized gas being applied to the
test mode inlet 815, thecompressor 900 is disabled and theoxygen sensor 860 is then used to test the oxygen level or concentration of the gas applied to thetest mode inlet 815. - Referring to
FIG. 15 , the operation of thedevice 800 may, for example, be advantageously controlled by acontroller 1100. Thecontroller 1100 is most preferably a microcontroller, but may be, for example, a microprocessor with associated memory and input/output circuitry, an application specific integrated circuit, a field programmable gate array, or other suitable programmable device. - The
controller 1100 receives inputs from theoxygen sensor 860, thehigh pressure switch 880 and thetest pressure switch 852 and provides outputs to thecompressor 900 and theindicators controller 1100 may also, for example, incorporate the previously mentioned control means 50. Theindicators - When the
power switch 840 is first turned on, theFULL indicator 1102, theWAIT indicator 1104, theFAULT indicator 1106 and theTEST indicator 1108 will come on for a short time (e.g., 1 second) to provide an indication that these indicators are functioning. Then theindicators - The
WAIT indicator 1104 will remain on long enough for theoxygen sensor 860 to reach operating temperature (e.g., 3.0 minutes). - The
controller 1100 also monitors the heater current and voltage and the output current voltage of theoxygen sensor 860 whenever thedevice 800 is turned on. If a fault in theoxygen sensor 860 is detected at any time, theWAIT indicator 1104 is flashed at a one second rate, theFAULT indicator 1106 is activated and all other indicators are deactivated. In this state, thecompressor 900 and the test mode function will not operate. - If no gas pressure is detected by the
test pressure switch 852, thedevice 800 will operate in normal mode. That is, if there is an acceptable level of oxygen as sensed by theoxygen sensor 860 in the gas applied to the normal mode inlet 820 (e.g., greater than 91 percent) thecompressor 900 will run and theFILLING indicator 1110 will be activated. If thehigh pressure switch 880 is activated, theFULL indicator 1102 will be activated, theFILLING indicator 1110 will be deactivated and thecompressor 900 will be deactivated by thecontroller 1100. - If the
high pressure switch 880 is activated during the warm up period (e.g., a full bottle (e.g., 2,000 psi) already attached to the oxygen outlet 825), theFAULT indictor 1106 will be flashed at a one second rate by thecontroller 1100 and thedevice 800 must be reset to operate. - If the
test pressure switch 852 detects gas pressure at thetest mode inlet 815, thedevice 800 will operate in test mode. If the gas pressure at theinlet 815 is removed, thedevice 800 will again operate in normal mode. - Whenever the
device 800 enters or leaves test mode, thecontroller 1100 will suspend the operation of thedevice 1100 for a period of time (e.g., 30 seconds) and activate theWAIT indicator 1104 to allow theoxygen sensor 860 time to stabilize with a new input gas. - In test mode, the
controller 1100 will disable thecompressor 900, activate theTEST indicator 1108 and use theoxygen sensor 860 to test the oxygen level of the gas applied to thetest mode inlet 815. If there is an acceptable level of oxygen, thecontroller 1100 will activate theFULL indicator 1102. Otherwise, thecontroller 1100 will activate theFAULT indicator 1106. - The test mode of operation permits a user to conveniently check the oxygen content of a cylinder or concentrator output without activating the compressor of the device. The user activates the test mode by merely connecting a gas source to the test mode inlet. Normal operation resumes when the gas source is removed. The user is not required to perform any other operation. This is particularly advantageous for impaired, unsophisticated or technology intimidated users.
- The radial compressor and assembly comprising connecting tubing etc. is compact and light, approximately % the size of
compressor assembly 100 shown inFIG. 8 , and approximately ¼ the weight thereof. Advantageously, the radial compressor of the present invention can be utilized with any commercially available oxygen concentrator and has a unitized construction and compact design for easy placement and storage. The radial compressor of the present invention is very efficient with respect to power consumption, is quiet when running, and produces very little vibration. Moreover, while the consumption of power is low, the unit has generally the same features as other units such as inFIGS. 1-10 , for example, the same fill time. - Another embodiment of the present invention, similar to that shown in
FIGS. 11 through 15 , is set forth inFIGS. 16 , 17, and 18 which feeds enriched oxygen primarily to a patient and secondarily to a buffer tank and then to a radial compressor. Unless specified hereinbelow, the embodiments ofFIGS. 16 , 17, and 18 are generally the same as that set forth inFIGS. 11 through 15 as described hereinabove and hereby fully incorporated by reference. It is also to be understood that all pressures in this specification relate to pressures above atmosphere pressure, that is 5 psi is 5 pounds per square inch gauge. In the embodiment ofFIGS. 16 through 18 , enriched oxygen from an oxygen or product storage tank is fed through two different outlets or lines, one line directed to the patient and the other line connected to a buffer tank. The buffer tank flow line contains oxygen-enriched gas at a pressure generally that of the storage tank whereas the patient flow line feeds the oxygen-enriched gas at a reduced, low pressure to the patient. The apparatus utilizes two different and independent compressors, an initial compressor for compressing air and feeding it to molecular sieves for enriching or concentrating to a high amount of oxygen by volume and a second compressor, which operates independently of the first, for compressing the oxygen-enriched gas to a very high pressure for delivery to a high pressure storage cylinder. That is, the second, e.g. a radial, compressor is operated by a power source, e.g. a motor, engine, other than by the oxygen enriched gas as compresses by the first compressor (such as in a pressure intensifier). As with the previous embodiments, the embodiment ofFIGS. 16 through 18 prioritizes the oxygen-enriched gas so that flow is always continuous to the patient and optional to the buffer tank. - A description of the apparatus for compressing and storing an oxygen-enriched gas is as follows. Initial or
concentrator compressor 1205 receives air from the atmosphere and throughflow line 1207 feeds it tooxygen concentrator 1210. The concentrator can be any conventional or standard concentrator known to the art and to the literature, or as described hereinabove. Such a concentrator is commercially available from Invacare Corporation, Elyria, Ohio as models 5LX and 5LX02. Typically, such oxygen concentrators, through the use of molecular sieves, enriches the oxygen to a desirable level such as at least about 50% or 75%, desirably at least about 80%, and preferably at least about 85% or 90%, more preferably about 93% by volume plus or minus 3%. The oxygen-enriched gas is fed through producttank flow line 1215 to oxygenproduct storage tank 1220. Pressure in the storage tank is generally the same as generated by the oxygen concentrator and can vary as from about 15 to about 20 or 22 psi.Storage tank 1220 primarily acts as a holding tank for feeding the oxygen-enriched gas to the patient but also provides oxygen-enriched gas to a buffer tank which then is fed to a second independent compressor, which operates independently of the oxygen concentrator compressor, and subsequently to a high-pressure storage cylinder. - Integral with
oxygen storage tank 1220, ispressure regulator 1225 which serves to reduce the oxygen-enriched gas to any desirable pressure for flow topatient flow meter 1235 throughpatient flow line 1230. Accordingly, the pressure regulator emits oxygen-enriched gas from the product storage tank to a first outlet such asline 1230 at a reduced or low pressure. Whilepressure regulator 1225 can be located on or in any portion of the storage tank, it is conveniently an integral part of the storage tank lid or cap. That is, concentrated or oxygen-enriched gas within the product storage tank before exiting the same is fed to thepressure regulator 1225 which reduces the pressure to a desirable predetermined low pressure such as from about 3 or 4 to about 10 psi with a desired pressure being about 4 to about 6 or 8 psi and preferably about 5 psi. The oxygen-enriched gas is then fed topatient flow meter 1235 where, as in the prior embodiments, it can be adjusted to any flow rate such as from about 0.1 or 1.0 to about 3, 5, or 6 liters per minute.Flow meter 1235 can be adjusted by a patient, or by a physical therapist or other medical personnel. - An oxygen sensor can be located either within
oxygen concentrator 1210 or, as shown, onpatient flow line 1230 asoxygen sensor 1233. When located in the oxygen concentrator, the sensor measures the level of the oxygen by volume in the gas and if it is below a predetermined range, a safety warning such as by a light, buzzer, etc. is activated warning the patient or user of the low oxygen-enriched gas value. This prevents a patient from utilizing the oxygen concentrator if the oxygen value is too low. Alternatively, when located onpatient flow line 1230, the sensor also monitors the level of the oxygen in the gas to ensure that the concentration is above a predetermined value. Otherwise, a safety warning such as a light, buzzer, etc. is activated to warn the patient of low oxygen condition. - An independent or separate second outlet feeds oxygen-enriched gas from the oxygen or product storage tank to
buffer tank 1240 through buffertank flow line 1245. The pressure of the oxygen-enriched gas of the second outlet is independent of and is greater than the low pressure of the first outlet and generally is at the pressure ofproduct storage tank 1220. Desirably, the moderate pressure inbuffer flow line 1245 is from about 10, 12 or 15 to about 20 or 22 psi. - Flow restrictor 1249 located in buffer
tank flow line 1245 serves to limit the flow of the oxygen-enriched gas so that a sufficient amount is generally always available for the patient and the remaining amount, which often is small, is fed solely to the buffer tank, etc.Flow line 1245 also contains anoxygen sensor 1248 which continuously monitors the concentration of the oxygen. The concentration of oxygen to the buffer tank is maintained at a predetermined level or set point, typically 93% oxygen by volume plus or minus 3%. Ifsensor 1248 detects a value lower than the predetermined set point, the electronics of the apparatus are designed to shut offcompressor 1250. Stopping the radial compressor permits the oxygen concentrator to process air at a slower rate thus resulting in an increased oxygen concentration or purity so that the predetermined oxygen concentration such as about 93% oxygen by volume can once again be quickly achieved. - The right-hand side of
FIG. 16 relating to the buffer tank, the compressor and the high pressure storage cylinder, etc. is further detailed inFIG. 17 . -
Buffer tank 1240 acts as a holding tank for the oxygen-enriched gas which is fed tocompressor 1250 vialine 1255. Whilecompressor 1250 can be any conventional compressor as opposed to a pressure intensifier, it preferably is a radial compressor as described hereinabove and accordingly fully incorporated by reference, wherein like numbers describe like parts. Through the various stages, such as set forth above, the oxygen-enriched gas is compressed in stages until a suitable end stage emits the oxygen at a pressure for storage in highpressure storage cylinder 1260. After being compressed by the radial compressor, and once a sufficient amount of oxygen-enriched gas has been fed to highpressure storage cylinder 1260 to achieve a desired predetermined pressure,pressure switch 880 will automatically turn offcompressor 1250.Pressure gauge 835 also exists as a visual indication of the amount of pressure incylinder 1260.Check valve 885 prevents oxygen-enriched gas from flowing out of thehigh cylinder 1260 whenever the compressor is not being operated. As a safety backup,burst disk 884 is provided should for some reason the automatichigh pressure switch 880 not turn offcompressor 1250 at a predetermined high pressure level. - As noted in the prior embodiment with regard to the radial compressor setup, the pressure of high
pressure storage cylinder 1260 can be any desired or predetermined pressure. While the desired pressure ofcylinder 1260 is approximately 2,000 psi, it can range from about 500 to about 4,000 and desirably from about 1,500 to about 3,000 and preferably from about 1,900 to about 2,100 psi. - The advantage of the embodiment of
FIGS. 16 and 17 is that independent and different pressures from the product storage tank can be utilized with the pressure component fed to the buffer tank second compressor-etc. being greater and independent of the component fed to the patient. The second orradial compressor 1250 operates independently ofcompressor 1205 which feeds air to the oxygen concentrator. - Referring to
FIG. 18 , the operation of apparatus 1200 can be operated by a controller in a manner as described hereinabove with regard toFIGS. 11 through 15 . Thus,controller 1100 preferably is a microcontroller, but can be, for example, a microprocessor with associated memory and input/output circuitry, an application specific integrated circuit, a field programmable gate array, or other suitable programmable device. -
Controller 1100 receives inputs fromoxygen sensor 1233 or the concentrator oxygen sensor, andhigh pressure switch 880 and provides outputs to thecompressor 1250 and theindicators controller 1100 may also, for example, incorporate the previously mentioned control means 50. Theindicators - When the
power switch 840 is first turned on, theFULL indicator 1102, theWAIT indicator 1104, theFAULT indicator 1106 and theTEST indicator 1108 will come on for a short time (e.g., 1 second) to provide an indication that these indicators are functioning. Then theindicators - The
WAIT indicator 1104 will remain on long enough for theoxygen sensor 1233 or the concentrator oxygen sensor to reach operating temperature (e.g., 3.0 minutes). - The
controller 1100 also monitors the heater current and voltage and the output current voltage of theoxygen sensor 1233 or the concentrator oxygen sensor whenever device 1200 is turned on. If a fault in theoxygen sensor 1233 or the concentrator oxygen sensor is detected at any time, theWAIT indicator 1104 is flashed at a one second rate, theFAULT indicator 1106 is activated and all other indicators are deactivated. In this state, thecompressor 1250 and the test mode function will not operate. - If there is an acceptable level of oxygen as sensed by the
oxygen sensor 1233 or the concentrator oxygen sensor in the gas applied to the normal mode inlet 1215 (e.g., greater than 90%) thecompressor 1250 will run and theFILLING indicator 1110 will be activated. If thehigh pressure switch 880 is activated, theFULL indicator 1102 will be activated, theFILLING indicator 1110 will be deactivated andcompressor 1250 will be deactivated by thecontroller 1100. - If
oxygen sensor 1248 detects an acceptable predetermined level of oxygen,radial compressor 1250 will be allowed to operate. However, shouldoxygen sensor 1248 detect an amount of oxygen below a predetermined level, the controller will automatically close down or stop the operation ofradial compressor 1250. After the oxygen concentration is increased to above the predetermined level,radial compressor 1250 will once again allow it to be operated. - If the high pressure switch-880 is activated during the warm up period (e.g., a full bottle (e.g., 2,000 psi) already attached to the oxygen outlet 825), the
FAULT indictor 1106 will be flashed at a one second rate by thecontroller 1100 and the device 1200 must be reset to operate. - The test mode operation is based upon a value of pressure being present in a test fitting. If the pressure of the gas stream at the test inlet is greater than some predetermined value, then the
controller 1100 should temporarily suspend any operation of the radial compressor and then wait a predetermined time (typically 30 sec.) for the gas values to stabilize. Once the timeout period is over, the controller then usesoxygen sensor 1248 to determine whether the feed gas used by the radial compressor for filling the high pressure tank is above a predetermined concentration value. - The operation of the test mode is basically the same whether or not the unit enters or exits the test mode. There is always a delay to make sure the gas stream is within the requirements of the minimum values of oxygen concentration for filling the high pressure tank or testing the gas value in the test mode. This delay is included to make sure the gas stream reaches full value with any change in sources of the gas within the internal plumbing of the system.
- The operation of the test mode is basically the same whether or not the unit enters or exits the test mode. There is always a delay to make sure the gas stream is within the requirements of the minimum values of oxygen concentration for filling the high pressure tank or testing the gas value in the test mode. This delay is included to make sure the gas stream reaches full value with any change in sources of the gas within the internal plumbing of the system.
- An alternative
compact compressor 700 is shown inFIGS. 19 through 23 wherein the motor, drive wheels and drive belt assembly is similar to that shown inFIGS. 7 and 8 .Motor 701 contains ashaft 702 which throughfirst drive belt 703 is connected tofirst drive wheel 705 havingfirst drive shaft 708. The drive wheel contains a plurality of grooves and projections to receivedrive belt 703, which respectively includes corresponding projections and grooves.First drive shaft 708 is connected tohub gear 710. In order to transfer power fromhub gear 710 tosecond drive wheel 715,second drive belt 713 is utilized which has a plurality of projections and grooves which engage, respectively, grooves and projections ofsecond drive wheel 715.Second drive wheel 715 is connected tosecond drive shaft 718. - Due to utilization of
motor 701, which generally can be any conventional electric motor capable of rotating at any desirable speed, for example, at about 1,600 or 1,700 RPM, withdrive wheel 705 havinghub gear 710 andsecond drive wheel 715 havingsecond drive shaft 718, a double reduction of the rotational speed of the motor is achieved. The reduction ratio of the motor shaft speed to the first drive wheel orshaft 708 thereof and the reduction from thefirst drive shaft 708 to the second drive wheel andshaft 718 thereof can be any desirable value depending upon the diameter of the various drive wheels and hub shafts. Desirably the first reduction is approximately a ratio of 6:1 sofirst drive shaft 708 rotates at about 265 to about 285 RPM. The reduction ratio between thefirst drive shaft 708 or offset gear and thesecond drive shaft 718 is also approximately 6:1 so that the second drive shaft rotates at approximately 44 to about 48 RPM. Although not shown, both drivebelts - The
compact compressor assembly 700 can generally contain any number of compression stages such as cylinders and pistons but desirably contains three as shown. The first piston desirably is a wobble piston which is connected in series with two sequential cylindrical pistons for compressing the oxygen enriched gas or other gas to a generally predetermined pressure. Consideringwobble piston assembly 730, as seen inFIGS. 19 and 22A , it containswobble piston 732 having a relativelylarge diameter head 733 thereon, which is fixedly connected by connectingrod 734 tobase 735 havingaperture 737 therein. The wobble piston is operated byfirst drive shaft 708 by means of offsetcam 721 which has an offsetshaft 722 extending therefrom. Offsetshaft 722 engageswobble base aperture 737 to reciprocate the wobble piston. Since there is no pivot point in the vicinity ofwobble piston head 733, asshaft 708 rotateswobble piston 732 will reciprocate in a longitudinal direction and at the same time wobble. That is, the top portion of the piston head or face will longitudinally proceed or recede the center point of the piston head due to offsetcam shaft 722. The wobble piston assembly will compress enriched oxygen received fromproduct tank 30 or thebuffer tank 200 and compress it inpiston cylinder 740 when received from cylindermanifold head 742. - The compact multi-stage compressor of the present invention can have more than one wobble piston assembly, although one is preferred. It can also have more than two cylinder piston assemblies, although two are preferred. As shown in
FIG. 19 , the second andthird piston assemblies second drive shaft 718 so that as the gas, such as enriched oxygen, is being compressed in one cylinder, the gas in the other cylinder is being drawn therein.Second drive shaft 718 has an offsetcam 726 located at the end thereof which cam contains offsetcam shaft 727 to which bothpiston assemblies - The structure of the second and third cylinder assemblies is generally shown in
FIGS. 19 and 21 .Second piston assembly 750 containspiston head 753, which is pivotally connected through a wrist pin, not shown, to connectingrod 754. Base 755 of the connecting rod through an aperture is pivotally connected to offsetdrive shaft 727. The piston reciprocates withinsecond cylinder 760 which containscylinder manifold 762 to admit and release the oxygen or gas from the cylinder. Upon compression of the oxygen or gas in the second cylinder, it is transferred to thethird piston assembly 770 via line 787. - Similarly,
third piston assembly 770 containspiston head 773, which through a pivotal wrist pin, not shown, is connected to connectingrod 774.Connecting rod base 775 has an aperture therein which pivots about offsetdrive shaft 727. The piston assembly is contained withinthird cylinder 780.Cylinder manifold 782 receives enriched oxygen or gas via transfer line 787 from the second cylinder and after compression thereof; the compressed oxygen or gas is transferred byline 789 to a high-pressure storage container such as abottle cylinder 820. - The piston rings of the
second piston head 753 are shown inFIG. 22B , enlarged for clarification, and contain afirst annulus 791 which hasU-shaped seal 792 therein. Atension coil spring 793 resides within the U portion of the seal and serves to force the seal radially outwardly against the walls of the cylinder. The base of theseal 794 extends radially outward to further effect a seal with the cylinder wall. Asecond annulus 796 contains aglide ring 797 therein which is forced outwardly against a cylinder wall bycoil spring 798. The third piston head is similar to the second piston head but the two seals are separated from each other by connectingrod 774 as seen inFIG. 12C . Thus, afirst annulus 801 has aU-shaped seal 802 therein containingtension coil spring 803 which forces the seal radially outward against the piston wall. As inFIG. 22B ,base 804 of the first seal extends radially outward against the cylinder wall. Separated by connectingrod 774, asecond annulus 806 in the piston head containsglide ring 807 which is forced radially outward against the cylinder wall bycoil tension spring 808. The configuration of the seals of the second and third pistons help maintain a tight seal during operation assuring that compression is not lost. - The compact and
lightweight compressor assembly 700 can achieve any desirable final pressure (e.g., from about 500 to about 3,000 PSI) such as that required for a compressed gas container and especially a compressed oxygen enriched bottle for use by a patient. In the embodiment shown and described, a final pressure of approximately 2,000 PSI is often preferred. Accordingly,wobble piston 732, while having a short stroke but a large piston head, generally receives enriched oxygen fromproduct tank 30 orbuffer tank 200 through a restrictor at any desired pressure such as about 10 PSI and compresses it to about 60 PSI. Desirably, there is anaccumulator tank 785 between the first piston assembly and thesecond piston assembly 750 to store up the compressed gas produced by the wobble piston inasmuch as it reciprocates approximately six times for every one reciprocation of the second and third pistons. This tank can be a conventional tank such as a cylindrical tank, or desirably it can be in the form of a long thick butwide hose 785. Compressed gas from the wobble piston assembly, which is operated byfirst power source 705, is transferred tosecond cylinder manifold 762, where it is compressed by the second piston, operated bysecond drive shaft 718, to a pressure of approximately 400 PSI. From there it is transferred via line 787 to the input ofthird cylinder manifold 782 whereupon it is compressed by the third piston, which also is driven bysecond drive shaft 718, to a pressure of approximately 2,000 PSI. - To achieve the desired increase in pressure, the diameter of each subsequent piston head is generally decreased. It is to be understood that generally any desirable head diameter can be utilized. In the embodiments of
FIGS. 19 through 23 , the diameter of the wobble piston is generally about 1.8 inches. The diameter of the second piston head can be approximately 0.875 inches, whereas the diameter of the third piston head is approximately 0.25 inches. The second and third pistons can have a stroke of approximately 1.25 inches, whereas the wobble piston can have a stroke of approximately 0.375 inch. The embodiment ofFIG. 19 through 23 also contain check valves, generally before and after each cylinder, to prevent the oxygen enriched gas from being pushed backwards into the preceding cylinder or into the product or buffer tank. - An advantage of the compressor of
FIGS. 19-23 is that it generally is compact and small, approximately ⅓ the size of the embodiment of the compressor shown inFIG. 8 , and also approximately ⅓ the weigh thereof, so that it can weight only about 40 pounds. Due to the compactness of the alternative compressor, it can be mounted directly or on top of the oxygen concentrator or it can be made an integral part thereof. - Bottle cylinder or high
pressure storage container 820, can generally be of any size and contain any pressure although the above noted pressure of approximately 2,000 PSI is desirable. A small bottle of approximately 62 cubic inches can last a patient for approximately two hours. This time can be extended to approximately six hours when utilized in conjunction with a conserving device. A large tank of approximately 283 cubic inches can generally last a patient for approximately eight hours or approximately twenty-four hours when utilized with a conserving device. - Manifold block 810 is located between
third piston assembly 770 andbottle 820. The manifold block contains pressure gauge 812 and a high pressure switch which, as explained herein below, turns off the compressor once a predetermined pressure is achieved. The manifold also contains a ruptured disc, not shown, as a safety backup should the pressure to the bottle become too high. The manifold block also contains a bleed-off valve, not shown, which gradually releases the pressure built up incompressor assembly 700 as well asline 789 so that a loud abrupt pressure release noise is not caused.Bottle 820 also contains a ruptured disc thereon, not shown, which is set to rupture at a pressure higher than that of the manifold rupture disc. The bottle can also contain apressure gauge 822. - The
compact compressor 700 can be utilized in the same manner as before, that is in association with an oxygenator and with various flow schemes, designs, etc., whether prioritized to insure that a patient receives a required amount of the oxygen enriched gas, or not prioritized. Accordingly, the flow diagrams ofFIG. 2 , 3 or 4, can be utilized but it is to be understood that generally any other flow system can also be utilized to route the enriched oxygen fromproduct tank 30 either directly, or indirectly, etc., to the buffer tank and tocompact compressor 700. - An example of electrical circuitry which can be utilized to operate
compact compressor assembly 700 is shown inFIG. 23 . - Mains power (line voltage) is supplied through a three conductor grounded line cord. The hot side of the mains power is connected to a resettable thermal circuit breaker. The output lead of the circuit breaker feeds the mains power on/off switch. The neutral side of the mains power is supplied to one side of the High Pressure switch PRS2, Low Pressure switch PRS1, the “Run” light L1, hour meter HM1, and the compressor motor M1.
- With the power switch SW1 on, mains hot is supplied to one side of the “Full”
light 12, the “Start” switch SW2, and the maintaining contact of relay K1. When the momentary contact “Start” switch SW2 is depressed, power is supplied to the relay K1 coil, one side of the “Run” light L1, the coil of motor relay K2 and the maintaining contact of the motor relay K2. The High Pressure switch PRS2 supplies the neutral mains return to the relay K1 coil if the cylinder pressure is below the full pressure setpoint, latching relay K1 on. - If the Low Pressure switch PRS1 is activated by sensing pressure above its setpoint, K2 is energized, supplying power to the hour meter and the compressor motor. The motor relay will cycle on and off by the low pressure switch if the inlet pressure goes above or below the switch setpoint.
- If the cylinder reaches the High Pressure switch PRS2 setpoint, PRS2 will activate, removing neutral power from the coil of latching relay K1 and lighting the “Full” light L2. This will remove power from the K1 coil, causing the latching and motor relays K1 and K2 to be de-energized, stopping the compressor motor and turning off the “Run” light L1.
- While in accordance with the patent statutes the best mode and preferred embodiments have been set forth, the scope of the invention is not limited thereto, but rather by the scope of the attached claims.
Claims (21)
Priority Applications (1)
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US13/404,848 US20120152248A1 (en) | 1997-10-01 | 2012-02-24 | Apparatus for compressing and storing oxygen enriched gas |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
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US08/942,063 US5988165A (en) | 1997-10-01 | 1997-10-01 | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
US09/154,442 US6302107B1 (en) | 1997-10-01 | 1998-09-16 | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
US09/695,612 US7204249B1 (en) | 1997-10-01 | 2000-10-24 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US09/952,763 US6805122B2 (en) | 1997-10-01 | 2001-09-14 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US10/605,754 US6923180B2 (en) | 1997-10-01 | 2003-10-23 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US11/180,395 US7294170B2 (en) | 1997-10-01 | 2005-07-13 | Apparatus for compressing and storing oxygen enriched gas |
US11/938,551 US8123497B2 (en) | 1997-10-01 | 2007-11-12 | Apparatus for compressing and storing oxygen enriched gas |
US13/404,848 US20120152248A1 (en) | 1997-10-01 | 2012-02-24 | Apparatus for compressing and storing oxygen enriched gas |
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US11/938,551 Division US8123497B2 (en) | 1997-10-01 | 2007-11-12 | Apparatus for compressing and storing oxygen enriched gas |
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US09/154,442 Expired - Lifetime US6302107B1 (en) | 1997-10-01 | 1998-09-16 | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
US09/952,763 Expired - Lifetime US6805122B2 (en) | 1997-10-01 | 2001-09-14 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US10/605,754 Expired - Lifetime US6923180B2 (en) | 1997-10-01 | 2003-10-23 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US11/180,395 Expired - Fee Related US7294170B2 (en) | 1997-10-01 | 2005-07-13 | Apparatus for compressing and storing oxygen enriched gas |
US11/938,551 Expired - Fee Related US8123497B2 (en) | 1997-10-01 | 2007-11-12 | Apparatus for compressing and storing oxygen enriched gas |
US13/404,848 Abandoned US20120152248A1 (en) | 1997-10-01 | 2012-02-24 | Apparatus for compressing and storing oxygen enriched gas |
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US08/942,063 Expired - Lifetime US5988165A (en) | 1997-10-01 | 1997-10-01 | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
US09/154,442 Expired - Lifetime US6302107B1 (en) | 1997-10-01 | 1998-09-16 | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
US09/952,763 Expired - Lifetime US6805122B2 (en) | 1997-10-01 | 2001-09-14 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US10/605,754 Expired - Lifetime US6923180B2 (en) | 1997-10-01 | 2003-10-23 | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US11/180,395 Expired - Fee Related US7294170B2 (en) | 1997-10-01 | 2005-07-13 | Apparatus for compressing and storing oxygen enriched gas |
US11/938,551 Expired - Fee Related US8123497B2 (en) | 1997-10-01 | 2007-11-12 | Apparatus for compressing and storing oxygen enriched gas |
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AU (2) | AU715855B2 (en) |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170354432A1 (en) * | 2016-06-14 | 2017-12-14 | Medaxis Ag | Pump module |
WO2018058173A1 (en) * | 2016-09-27 | 2018-04-05 | Freo2 Pty Ptd | Apparatus for delivering a therapeutic gas |
US9956371B2 (en) | 2015-03-24 | 2018-05-01 | Ventec Life Systems, Inc. | Ventilator with integrated cough-assist |
CN111550382A (en) * | 2019-08-23 | 2020-08-18 | 株式会社神户制钢所 | Compressor unit |
US10773049B2 (en) | 2016-06-21 | 2020-09-15 | Ventec Life Systems, Inc. | Cough-assist systems with humidifier bypass |
US10905837B2 (en) | 2015-04-02 | 2021-02-02 | Hill-Rom Services Pte. Ltd. | Respiratory therapy cycle control and feedback |
US11191915B2 (en) | 2018-05-13 | 2021-12-07 | Ventec Life Systems, Inc. | Portable medical ventilator system using portable oxygen concentrators |
US11247015B2 (en) | 2015-03-24 | 2022-02-15 | Ventec Life Systems, Inc. | Ventilator with integrated oxygen production |
Families Citing this family (149)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5979440A (en) | 1997-06-16 | 1999-11-09 | Sequal Technologies, Inc. | Methods and apparatus to generate liquid ambulatory oxygen from an oxygen concentrator |
US7204249B1 (en) * | 1997-10-01 | 2007-04-17 | Invcare Corporation | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US5988165A (en) * | 1997-10-01 | 1999-11-23 | Invacare Corporation | Apparatus and method for forming oxygen-enriched gas and compression thereof for high-pressure mobile storage utilization |
UA72189C2 (en) | 1997-11-17 | 2005-02-15 | Янссен Фармацевтика Н.В. | Aqueous suspensions of 9-hydroxy-risperidone fatty acid esters provided in submicron form |
US6446630B1 (en) | 1999-02-11 | 2002-09-10 | Sunrise Medical Hhg Inc | Cylinder filling medical oxygen concentrator |
FR2792210B1 (en) * | 1999-04-13 | 2001-09-14 | Air Liquide Sante Int | PORTABLE MEDICAL EQUIPMENT FOR OXYGEN THERAPY AT HOME |
US6393802B1 (en) * | 1999-12-22 | 2002-05-28 | Sunrise Medical Hhg, Inc. | Cylinder filler for use with an oxygen concentrator |
US6394089B1 (en) * | 2000-01-18 | 2002-05-28 | Northrop Grumman Corporation | Patient ventilator oxygen concentration system |
US6342090B1 (en) | 2000-05-16 | 2002-01-29 | Litton Systems, Inc. | Gas generating system with multi-rate charging feature |
FR2809329B1 (en) * | 2000-05-25 | 2002-08-16 | Air Liquide | PORTABLE OXYGEN CONCENTRATOR |
US6651658B1 (en) * | 2000-08-03 | 2003-11-25 | Sequal Technologies, Inc. | Portable oxygen concentration system and method of using the same |
IT1318801B1 (en) * | 2000-08-31 | 2003-09-10 | Nuovo Pignone Spa | DEVICE FOR CONTINUOUS ADJUSTMENT OF THE FLOW RATE OF GAS TREATED AN ALTERNATIVE COMPRESSOR. |
DE20015783U1 (en) * | 2000-09-12 | 2002-02-07 | Medicup Medizintechnik GmbH, 35327 Ulrichstein | Equipment for the production and storage of oxygen |
DE60125826T2 (en) * | 2000-10-24 | 2007-08-16 | Invacare Corp., Elyria | DEVICE AND METHOD FOR SUPPLYING OXYGENATED GAS |
US6511526B2 (en) * | 2001-01-12 | 2003-01-28 | Vbox, Incorporated | Pressure swing adsorption gas separation method and apparatus |
US7073773B2 (en) * | 2001-03-27 | 2006-07-11 | Invacare Corporation | Rapid connection coupling |
FR2823180B1 (en) * | 2001-04-04 | 2003-07-25 | Air Liquide | PROCESS AND INSTALLATION FOR DISTRIBUTING OXYGEN-ENRICHED AIR TO OCCUPANTS OF AN AIRCRAFT |
WO2003064009A1 (en) * | 2002-01-31 | 2003-08-07 | Airsep Corporation | Portable oxygen concentrator |
US6904913B2 (en) * | 2002-10-24 | 2005-06-14 | Acoba, Llc | Method and system for delivery of therapeutic gas to a patient and for filling a cylinder |
US6889726B2 (en) * | 2002-10-25 | 2005-05-10 | Invacare Corporation | Method and apparatus for filling portable high pressure cylinders with respiratory oxygen |
US20050042111A1 (en) * | 2003-02-05 | 2005-02-24 | Zaiser Lenoir E. | Fluid pump |
US7105039B2 (en) * | 2003-02-26 | 2006-09-12 | Scott Decker | Ozone remediation apparatus and methods |
DE10318384B4 (en) * | 2003-04-23 | 2007-11-22 | Dräger Medical AG & Co. KG | Incubator with an oxygen dosage |
US20040211414A1 (en) * | 2003-04-28 | 2004-10-28 | Litton Systems, Inc. | Oxygen concentration system having selectable beds |
DE10323137B4 (en) * | 2003-05-22 | 2008-04-30 | DRäGER AEROSPACE GMBH | Apparatus for enriching air with oxygen in an aircraft and a method for operating the apparatus |
US7066985B2 (en) * | 2003-10-07 | 2006-06-27 | Inogen, Inc. | Portable gas fractionalization system |
CA2540599C (en) | 2003-10-07 | 2013-09-03 | Inogen, Inc. | Portable gas fractionalization system |
US20050072423A1 (en) | 2003-10-07 | 2005-04-07 | Deane Geoffrey Frank | Portable gas fractionalization system |
WO2005060037A1 (en) * | 2003-12-17 | 2005-06-30 | Invacare Corporation | Oxygen supply system |
US7637989B2 (en) * | 2003-12-31 | 2009-12-29 | Merits Health Products Co., Ltd. | Rapid cycle pressure swing adsorption oxygen concentration method and mechanical valve for the same |
JP4971582B2 (en) * | 2004-02-16 | 2012-07-11 | 帝人ファーマ株式会社 | Oxygen concentrator |
US7617826B1 (en) | 2004-02-26 | 2009-11-17 | Ameriflo, Inc. | Conserver |
US8146592B2 (en) | 2004-02-26 | 2012-04-03 | Ameriflo, Inc. | Method and apparatus for regulating fluid flow or conserving fluid flow |
US7913497B2 (en) * | 2004-07-01 | 2011-03-29 | Respironics, Inc. | Desiccant cartridge |
US7455717B2 (en) | 2004-10-25 | 2008-11-25 | Invacare Corporation | Apparatus and method of providing concentrated product gas |
US7318327B2 (en) * | 2004-10-26 | 2008-01-15 | Respironics In-X, Inc. | Liquefying and storing a gas |
US7494521B2 (en) * | 2004-10-26 | 2009-02-24 | Althouse Michael D | Trigger mechanism for dust filter pulse cleaning system |
US20060107955A1 (en) * | 2004-11-22 | 2006-05-25 | Chen-Bong Cheng | Home oxygen-compression apparatus |
US7900627B2 (en) | 2005-01-18 | 2011-03-08 | Respironics, Inc. | Trans-fill method and system |
US7766010B2 (en) * | 2005-02-09 | 2010-08-03 | Vbox, Incorporated | Method of controlling the rate of oxygen produced by an oxygen concentrator |
US8020553B2 (en) * | 2005-02-09 | 2011-09-20 | Vbox, Incorporated | Ambulatory oxygen concentrator containing a three phase vacuum separation system |
US7121276B2 (en) * | 2005-02-09 | 2006-10-17 | Vbox, Incorporated | Personal oxygen concentrator |
US7431032B2 (en) * | 2005-02-09 | 2008-10-07 | Vbox Incorporated | Low power ambulatory oxygen concentrator |
US7604005B2 (en) * | 2005-02-09 | 2009-10-20 | Vbox Incorporated | Adsorbent cartridge for oxygen concentrator |
US20060174875A1 (en) * | 2005-02-09 | 2006-08-10 | Vbox, Incorporated | Ambulatory oxygen concentrator containing a power pack |
US7954490B2 (en) * | 2005-02-09 | 2011-06-07 | Vbox, Incorporated | Method of providing ambulatory oxygen |
US7866315B2 (en) * | 2005-02-09 | 2011-01-11 | Vbox, Incorporated | Method and apparatus for controlling the purity of oxygen produced by an oxygen concentrator |
US7171963B2 (en) * | 2005-02-09 | 2007-02-06 | Vbox, Incorporated | Product pump for an oxygen concentrator |
US20060174871A1 (en) * | 2005-02-09 | 2006-08-10 | Vbox, Incorporated | Ambulatory oxygen concentrator with high efficiency adsorbent |
US20060174877A1 (en) * | 2005-02-09 | 2006-08-10 | Vbox, Incorporated | Portable oxygen concentrator with a docking station |
US7244107B2 (en) * | 2005-03-24 | 2007-07-17 | Merits Health Products Co., Ltd. | Home oxygen-compression apparatus |
US7329304B2 (en) * | 2005-04-05 | 2008-02-12 | Respironics Oxytec, Inc. | Portable oxygen concentrator |
US7402193B2 (en) * | 2005-04-05 | 2008-07-22 | Respironics Oxytec, Inc. | Portable oxygen concentrator |
US7368005B2 (en) * | 2005-04-05 | 2008-05-06 | Respironics Oxytec, Inc. | Portable oxygen concentrator |
JP4644517B2 (en) * | 2005-04-19 | 2011-03-02 | 伸和コントロールズ株式会社 | 4-port automatic switching valve |
US8062003B2 (en) | 2005-09-21 | 2011-11-22 | Invacare Corporation | System and method for providing oxygen |
US7550031B2 (en) * | 2005-10-19 | 2009-06-23 | Sunrise Medical Hhg Inc. | Cylinder filling oxygen concentrator |
US7722700B2 (en) | 2006-09-18 | 2010-05-25 | Invacare Corporation | Apparatus and method of providing concentrated product gas |
WO2007078418A2 (en) | 2005-12-23 | 2007-07-12 | Exxonmobil Upstream Research Company | Multi-compressor string with multiple variable speed fluid drives |
US7686870B1 (en) | 2005-12-29 | 2010-03-30 | Inogen, Inc. | Expandable product rate portable gas fractionalization system |
US7604064B2 (en) * | 2006-01-17 | 2009-10-20 | ABI Technology, Inc | Multi-stage, multi-phase unitized linear liquid entrained-phase transfer apparatus |
US7459008B2 (en) * | 2006-03-16 | 2008-12-02 | Aylsworth Alonzo C | Method and system of operating a trans-fill device |
US7556670B2 (en) * | 2006-03-16 | 2009-07-07 | Aylsworth Alonzo C | Method and system of coordinating an intensifier and sieve beds |
US9229630B2 (en) * | 2006-04-03 | 2016-01-05 | Respironics Oxytec, Inc | User interface for a portable oxygen concentrator |
US7736132B2 (en) * | 2006-04-03 | 2010-06-15 | Respironics Oxytec, Inc. | Compressors and methods for use |
US8753435B2 (en) * | 2006-04-03 | 2014-06-17 | Ric Investments, Llc | Portable oxygen concentrator |
DE102006039181A1 (en) * | 2006-06-02 | 2007-12-06 | Airbus Deutschland Gmbh | Oxygen supply system for producing oxygenated air from cabin air in aircraft, has decentralized oxygen supply unit arranged for producing oxygenated air from cabin air using electrical energy |
US20080028933A1 (en) * | 2006-08-07 | 2008-02-07 | Ross David A | Radial sieve module |
US7875105B2 (en) | 2006-08-08 | 2011-01-25 | Invacare Corporation | Oxygen concentrator having structural sieve beds |
US8187367B2 (en) * | 2006-12-31 | 2012-05-29 | Wang Dong-Lei | Portable PSA oxygen generator |
JP3139801U (en) * | 2006-12-31 | 2008-02-28 | 冬雷 王 | Portable PSA oxygen generator |
US8156972B2 (en) | 2007-04-20 | 2012-04-17 | Ric Investments, Llc | System and method for filling a portable liquified gas storage/delivery system |
CN103657334B (en) | 2007-04-20 | 2016-03-09 | 英瓦卡尔公司 | Product gas inspissator and correlation technique thereof |
US7691351B2 (en) * | 2007-09-04 | 2010-04-06 | Memc Electronic Materials, Inc. | Method for treatment of a gas stream containing silicon tetrafluoride and hydrogen chloride |
US20090065007A1 (en) * | 2007-09-06 | 2009-03-12 | Wilkinson William R | Oxygen concentrator apparatus and method |
US7981195B2 (en) | 2007-11-09 | 2011-07-19 | Praxair Technology, Inc. | System for preventing contaminants from reaching a gas purifier |
US8986253B2 (en) | 2008-01-25 | 2015-03-24 | Tandem Diabetes Care, Inc. | Two chamber pumps and related methods |
US7722698B2 (en) | 2008-02-21 | 2010-05-25 | Delphi Technologies, Inc. | Method of determining the purity of oxygen present in an oxygen-enriched gas produced from an oxygen delivery system |
US8075676B2 (en) | 2008-02-22 | 2011-12-13 | Oxus America, Inc. | Damping apparatus for scroll compressors for oxygen-generating systems |
US9120050B2 (en) | 2008-04-21 | 2015-09-01 | Invacare Corporation | Product gas concentrator utilizing vacuum swing adsorption and method associated therewith |
US8408421B2 (en) | 2008-09-16 | 2013-04-02 | Tandem Diabetes Care, Inc. | Flow regulating stopcocks and related methods |
AU2009293019A1 (en) | 2008-09-19 | 2010-03-25 | Tandem Diabetes Care Inc. | Solute concentration measurement device and related methods |
US8109295B2 (en) * | 2008-10-24 | 2012-02-07 | Tyco Valves & Controls Lp | Manifold assembly |
FR2937879B1 (en) * | 2008-11-03 | 2011-04-15 | Mil S | PRESSURE VARIATION ADSORPTION FLUID TREATMENT METHOD AND CORRESPONDING INSTALLATION |
US20110209786A1 (en) * | 2008-11-12 | 2011-09-01 | Rasmussen Peter C | Vessel Compressor Methods and Systems |
CN102256684A (en) * | 2008-12-22 | 2011-11-23 | 皇家飞利浦电子股份有限公司 | Liquid oxygen production device and method |
US9250106B2 (en) | 2009-02-27 | 2016-02-02 | Tandem Diabetes Care, Inc. | Methods and devices for determination of flow reservoir volume |
CA2753214C (en) | 2009-02-27 | 2017-07-25 | Tandem Diabetes Care, Inc. | Methods and devices for determination of flow reservoir volume |
CN101839392B (en) * | 2009-03-20 | 2012-07-04 | 动力科技发展有限公司 | High compressed air cylinder filling machine |
US8211312B2 (en) * | 2009-03-27 | 2012-07-03 | Uop Llc | Separation system and method |
DE102009003066A1 (en) * | 2009-05-13 | 2010-11-18 | Robert Bosch Gmbh | Piston machine, in particular liquid piston machine |
US8590447B2 (en) * | 2009-07-02 | 2013-11-26 | Museum Of Science | System and method for self-administering automated hand-markings |
EP2456541A4 (en) | 2009-07-22 | 2013-03-06 | Vbox Inc | Method of separating and distributing oxygen |
EP2459251B1 (en) | 2009-07-30 | 2014-03-12 | Tandem Diabetes Care, Inc. | Infusion pump system with disposable cartridge having pressure venting and pressure feedback |
DK2462253T3 (en) * | 2009-08-07 | 2021-05-31 | Swagelok Co | COOLING AT LOW TEMPERATURE UNDER LOW VACUUM |
CN102575520A (en) * | 2009-08-17 | 2012-07-11 | 英瓦卡尔公司 | Compressor |
WO2011044091A2 (en) | 2009-10-05 | 2011-04-14 | Separation Design Group Llc | Ultra rapid cycle portable oxygen concentrator |
BR112012008824A2 (en) * | 2009-10-14 | 2019-09-24 | Tk Energia As | piston element, an apparatus comprising the piston element, and methods and use of the piston element and apparatus. |
CA2788833C (en) | 2010-02-09 | 2015-10-06 | Invacare Corporation | Breathing gas supply system |
US8517729B2 (en) * | 2010-03-04 | 2013-08-27 | The University of Western Ontario and Trudell Medical International | Oral mouthpiece and method for the use thereof |
DE102010011584A1 (en) * | 2010-03-16 | 2011-09-22 | Linde Ag | Generation of oxygen in hospitals |
US20110315140A1 (en) * | 2010-06-29 | 2011-12-29 | Precision Medical, Inc. | Portable oxygen concentrator |
US8603228B2 (en) | 2010-09-07 | 2013-12-10 | Inova Labs, Inc. | Power management systems and methods for use in an oxygen concentrator |
US8616207B2 (en) | 2010-09-07 | 2013-12-31 | Inova Labs, Inc. | Oxygen concentrator heat management system and method |
US20120204884A1 (en) * | 2011-02-10 | 2012-08-16 | Outcome Solutions LLC | Endotracheal tube cuff pressure regulator |
JP2012200387A (en) * | 2011-03-25 | 2012-10-22 | Fujikura Rubber Ltd | Oxygen tank unit for oxygen concentrator |
EP2714167A4 (en) * | 2011-05-24 | 2015-06-24 | Invacare Corp | Oxygen compressor with boost stage |
US8959906B2 (en) | 2011-06-22 | 2015-02-24 | Fluke Corporation | Gas boosters |
CN105342790A (en) | 2011-11-03 | 2016-02-24 | 德雷格医疗系统股份有限公司 | Transportable medical air compressor |
WO2013109415A1 (en) | 2012-01-20 | 2013-07-25 | Swagelok Company | Concurrent flow of activating gas in low temperature carburization |
US9624918B2 (en) | 2012-02-03 | 2017-04-18 | Invacare Corporation | Pumping device |
EP2628524B1 (en) * | 2012-02-14 | 2019-05-29 | Air Liquide Medical G.m.b.H. | Facility for on-site production of medical gas |
US9067174B2 (en) | 2012-03-09 | 2015-06-30 | Invacare Corporation | System and method for concentrating gas |
CN104271218B (en) * | 2012-03-09 | 2017-03-01 | 英瓦卡尔公司 | The system and method that concentrated gas are come by absorption |
US9266053B2 (en) | 2012-06-18 | 2016-02-23 | Invacare Corporation | System and method for concentrating gas |
US9180242B2 (en) | 2012-05-17 | 2015-11-10 | Tandem Diabetes Care, Inc. | Methods and devices for multiple fluid transfer |
US9550575B2 (en) * | 2012-05-25 | 2017-01-24 | B/E Aerospace, Inc. | On-board generation of oxygen for aircraft pilots |
US9555186B2 (en) | 2012-06-05 | 2017-01-31 | Tandem Diabetes Care, Inc. | Infusion pump system with disposable cartridge having pressure venting and pressure feedback |
CN102878061B (en) * | 2012-09-11 | 2015-09-09 | 佛山市广顺电器有限公司 | A kind of multi-level gas booster arrangement |
AU2013328916A1 (en) | 2012-10-12 | 2015-05-14 | Inova Labs, Inc. | Oxygen concentrator systems and methods |
BR112015008203A2 (en) | 2012-10-12 | 2017-07-04 | Inova Labs Inc | method and systems for the supply of oxygen enriched gas. |
AU2013328915B2 (en) | 2012-10-12 | 2018-04-26 | Inova Labs, Inc. | Dual oxygen concentrator systems and methods |
US9173998B2 (en) | 2013-03-14 | 2015-11-03 | Tandem Diabetes Care, Inc. | System and method for detecting occlusions in an infusion pump |
US9061238B2 (en) | 2013-03-15 | 2015-06-23 | Invacare Corporation | Gas concentrator |
US9907926B2 (en) | 2013-10-18 | 2018-03-06 | Silverbow Development, Llc. | Oxygen concentrator for mechanical ventilation |
US9440179B2 (en) | 2014-02-14 | 2016-09-13 | InovaLabs, LLC | Oxygen concentrator pump systems and methods |
RU2549334C1 (en) * | 2014-03-20 | 2015-04-27 | Анатолий Евгеньевич Веремеенко | Room life saving device protecting from polluted outer air (versions) |
EP4378496A3 (en) * | 2014-11-19 | 2024-07-10 | University of Maryland, Baltimore | Artificial lung system and its methods of use |
EP3310418B1 (en) * | 2015-06-22 | 2020-02-12 | Caire Inc. | Wearable oxygen generator and docking station enabling higher oxygen flow capacity |
US11002268B2 (en) * | 2015-07-27 | 2021-05-11 | Cobham Mission Systems Davenport Lss Inc. | Sealed cavity compressor to reduce contaminant induction |
AU2016316947B2 (en) * | 2015-08-31 | 2021-04-01 | Vapotherm, Inc. | High flow therapy with built-in oxygen concentrator |
US11123512B2 (en) * | 2015-10-23 | 2021-09-21 | Inogen, Inc. | Connection of a spontaneous delivery device to a concentrator |
US11458274B2 (en) | 2016-05-03 | 2022-10-04 | Inova Labs, Inc. | Method and systems for the delivery of oxygen enriched gas |
US20170340851A1 (en) * | 2016-05-24 | 2017-11-30 | Silverbow Development, Llc | Oxygen gas concentrator with outlet accumulator |
US10137402B2 (en) * | 2017-02-15 | 2018-11-27 | Oxus Co., Ltd. | Gas concentration device |
US10576235B2 (en) | 2017-05-18 | 2020-03-03 | Tokitae Llc | Management of a therapeutic oxygen delivery system |
CN107035644B (en) * | 2017-06-02 | 2019-12-31 | 王玲斌 | Air compressor |
WO2020242825A1 (en) | 2019-05-28 | 2020-12-03 | Invacare Corporation | System and method for concentrating gas |
KR102060980B1 (en) * | 2019-07-01 | 2019-12-31 | 주식회사 옥서스 | Oxygen providing apparatus |
US11654256B2 (en) * | 2020-04-14 | 2023-05-23 | Sudarshan Kumar Bhandari | Ventilator system and method thereof |
DE202020102459U1 (en) | 2020-04-30 | 2021-08-02 | Richard Brink Gmbh & Co. Kg | Ventilator |
WO2021222881A1 (en) * | 2020-05-01 | 2021-11-04 | Groman Inc. | Two pneumatic cylinder medical ventilator, system and method |
EP4182054A1 (en) | 2020-07-16 | 2023-05-24 | Invacare Corporation | System and method for concentrating gas |
EP4181993A4 (en) | 2020-07-16 | 2024-08-07 | Ventec Life Systems Inc | System and method for concentrating gas |
WO2022061285A1 (en) | 2020-09-21 | 2022-03-24 | Operatons Technology Development, Nfp | Method and apparatus to export fluid without discharge |
US20230017775A1 (en) | 2021-07-15 | 2023-01-19 | Invacare Corporation | System and method for medical device communication |
CN114352939A (en) * | 2021-11-29 | 2022-04-15 | 海洋石油工程股份有限公司 | Air breathing system of temporary shelter of offshore production platform |
WO2024105107A1 (en) * | 2022-11-16 | 2024-05-23 | Oezkalp Harun | Oxygen supply system and method |
EP4371648A1 (en) * | 2022-11-16 | 2024-05-22 | Harun Özkalp | Oxygen delivery system and method |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956738A (en) * | 1957-12-10 | 1960-10-18 | Atlas Copco Ab | Reciprocating cross-head compressors |
US4381179A (en) * | 1980-10-31 | 1983-04-26 | Lear Siegler, Inc. | Pumps with floating wrist pins |
US5033940A (en) * | 1989-01-19 | 1991-07-23 | Sulzer Brothers Limited | Reciprocating high-pressure compressor piston with annular clearance |
US5078580A (en) * | 1991-03-29 | 1992-01-07 | Dresser-Rand Company | Plural-stage gas compressor |
US5099748A (en) * | 1990-05-11 | 1992-03-31 | Genie Industries, Inc. | Pneumatic system for telescopic hoist |
US6805122B2 (en) * | 1997-10-01 | 2004-10-19 | Invacare Corporation | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US7204249B1 (en) * | 1997-10-01 | 2007-04-17 | Invcare Corporation | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
Family Cites Families (131)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US519423A (en) | 1894-05-08 | Apparatus for treating ramie or other fibrous growths | ||
US875297A (en) | 1906-08-20 | 1907-12-31 | George D Miller | Gasolene-engine. |
US1764655A (en) | 1927-11-07 | 1930-06-17 | Kelvinator Corp | Compressor |
US1873878A (en) | 1928-08-21 | 1932-08-23 | Doherty Res Co | High temperature adiabatic compressor |
GB374540A (en) * | 1930-03-19 | 1932-06-16 | Michele Antonio Caserta | Improvement in air or gas compressors |
US1936167A (en) | 1930-06-27 | 1933-11-21 | Atmospheric Nitrogen Corp | Apparatus for synthesizing ammonia |
GB370540A (en) | 1931-01-28 | 1932-04-14 | Frederick Robert Bergemann | Screw driver |
US1964679A (en) | 1932-09-28 | 1934-06-26 | Garland P Springfield | Compressor |
US2057158A (en) | 1935-03-25 | 1936-10-13 | Robert C Moffitt | Differential piston connecting linkage |
US2151825A (en) | 1936-10-15 | 1939-03-28 | Westinghouse Air Brake Co | Fluid compressor |
US2141057A (en) * | 1937-09-13 | 1938-12-20 | Virgil Scott | Gas compressor |
GB581476A (en) | 1944-07-25 | 1946-10-14 | Harry Ralph Ricardo | Improvements in or relating to gas compressing apparatus |
US2550369A (en) | 1947-07-18 | 1951-04-24 | Dunlop Rubber Co | Single-acting reciprocating engine |
US2628015A (en) | 1949-11-09 | 1953-02-10 | Franz J Neugebauer | Engine-driven air compressor |
US2944627A (en) * | 1958-02-12 | 1960-07-12 | Exxon Research Engineering Co | Method and apparatus for fractionating gaseous mixtures by adsorption |
ES264263A1 (en) | 1960-01-25 | 1961-06-16 | Danfos Ved Ingenior Mads Clausen | A pencil machine (Machine-translation by Google Translate, not legally binding) |
US3119410A (en) * | 1961-04-27 | 1964-01-28 | Nat Distillers Chem Corp | High pressure valve |
US3216648A (en) | 1962-04-02 | 1965-11-09 | Stephen H Ford | Automatic blowdown system for compressors |
BE629192A (en) | 1962-08-01 | 1900-01-01 | ||
US3208288A (en) * | 1962-11-01 | 1965-09-28 | Gen Precision Inc | Displacement pickoff for gyroscope |
DE1403963A1 (en) | 1963-07-02 | 1968-11-21 | Kurt Braetsch | Compressor with at least three stages |
US3313091A (en) * | 1963-11-04 | 1967-04-11 | Exxon Research Engineering Co | Vacuum cycle adsorption |
CH476919A (en) | 1967-06-07 | 1969-08-15 | Burckhardt Ag Maschf | Cylinder arrangement for high pressure compressors and pumps |
US3448664A (en) | 1967-10-25 | 1969-06-10 | Gen Motors Corp | Floating crown piston |
US3839946A (en) * | 1972-05-24 | 1974-10-08 | Hardie Tynes Mfg Co | Nonlubricated compressor |
US3924968A (en) * | 1972-07-27 | 1975-12-09 | Gen Motors Corp | Radial compressor with muffled gas chambers and short stable piston skirts and method of assembling same |
US3838948A (en) * | 1972-08-21 | 1974-10-01 | Corvey R Mc | Double acting pump |
US3898047A (en) * | 1973-07-17 | 1975-08-05 | Bendix Corp | Oxygen generation system |
US3964866A (en) | 1974-09-13 | 1976-06-22 | William Barney Shelby | Helium reclamation |
US4013429A (en) * | 1975-06-04 | 1977-03-22 | Air Products And Chemicals, Inc. | Fractionation of air by adsorption |
US4222750A (en) * | 1976-08-16 | 1980-09-16 | Champion Spark Plug Company | Oxygen enrichment system for medical use |
US4194890A (en) * | 1976-11-26 | 1980-03-25 | Greene & Kellogg, Inc. | Pressure swing adsorption process and system for gas separation |
US4263018A (en) | 1978-02-01 | 1981-04-21 | Greene & Kellogg | Pressure swing adsorption process and system for gas separation |
JPS55149620A (en) * | 1979-05-11 | 1980-11-21 | Noboru Sato | Oxygen-enriching system having good rise-up characteristic |
US4253524A (en) | 1979-06-21 | 1981-03-03 | Kobe, Inc. | High flow check valve apparatus |
DE2940606C2 (en) | 1979-10-06 | 1985-12-19 | Woma-Apparatebau Wolfgang Maasberg & Co Gmbh, 4100 Duisburg | Pump valve head for high pressure pumps |
US4349357A (en) | 1980-06-23 | 1982-09-14 | Stanley Aviation Corporation | Apparatus and method for fractionating air and other gaseous mixtures |
DE3029080A1 (en) * | 1980-07-31 | 1982-02-18 | Linde Ag, 6200 Wiesbaden | METHOD AND DEVICE FOR PROVIDING BREATH GAS |
US4353682A (en) * | 1980-09-22 | 1982-10-12 | The Trane Company | Reciprocating gas compressor having suction shut-off unloading means |
US4334833A (en) | 1980-10-28 | 1982-06-15 | Antonio Gozzi | Four-stage gas compressor |
DE3111614A1 (en) | 1981-03-25 | 1982-10-07 | Uhde Gmbh, 4600 Dortmund | "VALVE SET FOR HIGH PRESSURE PUMPS" |
DE3120812C2 (en) * | 1981-05-25 | 1984-04-19 | Siemens AG, 1000 Berlin und 8000 München | Radial piston compressor |
US4505333A (en) | 1981-09-02 | 1985-03-19 | Ricks Sr Tom E | Methods of and means for low volume wellhead compression hydrocarbon _gas |
US4599049A (en) * | 1982-01-11 | 1986-07-08 | Hewlett-Packard Company | High pressure meter pump |
WO1983003983A1 (en) | 1982-05-07 | 1983-11-24 | Marathon Medical Equipment Corporation | Oxygen concentrator |
US4516424A (en) | 1982-07-09 | 1985-05-14 | Hudson Oxygen Therapy Sales Company | Oxygen concentrator monitor and regulation assembly |
US4627860A (en) * | 1982-07-09 | 1986-12-09 | Hudson Oxygen Therapy Sales Company | Oxygen concentrator and test apparatus |
US4576616A (en) * | 1982-07-27 | 1986-03-18 | Proto-Med. Inc. | Method and apparatus for concentrating oxygen |
US4449990A (en) * | 1982-09-10 | 1984-05-22 | Invacare Respiratory Corp. | Method and apparatus for fractioning oxygen |
FR2539629B1 (en) | 1983-01-26 | 1987-08-21 | Lemasne Sa | PROCESS FOR PRODUCING STERILE AIR FOR MEDICAL USE AND INSTALLATION FOR CARRYING OUT SAID METHOD |
FR2551505B1 (en) | 1983-08-31 | 1988-02-26 | Groupe Indl Realisa Applic Gir | PUMPING SYSTEM FOR LIQUID PHASE CHROMATOGRAPHY |
US4610700A (en) | 1983-11-04 | 1986-09-09 | Union Carbide Corporation | Adsorbent composition useful in retarding corrosion in mufflers |
US4552271A (en) * | 1984-03-27 | 1985-11-12 | Kranz Kermit W | Collapsible container construction |
US4552571A (en) * | 1984-04-05 | 1985-11-12 | Vbm Corporation | Oxygen generator with two compressor stages |
GB8416380D0 (en) | 1984-06-27 | 1984-08-01 | Ae Plc | Manufacture of pistons |
US4983190A (en) | 1985-05-21 | 1991-01-08 | Pall Corporation | Pressure-swing adsorption system and method for NBC collective protection |
US4636226A (en) * | 1985-08-26 | 1987-01-13 | Vbm Corporation | High pressure oxygen production system |
WO1987001599A1 (en) * | 1985-09-23 | 1987-03-26 | Battelle Development Corporation | Oxygen/air mixture blower for respiratory care |
US4670415A (en) * | 1985-10-28 | 1987-06-02 | Monsanto Company | Process for the preparation of iron/lithium -promoted catalysts for the production of maleic anhydride |
US4645428A (en) * | 1985-10-31 | 1987-02-24 | Manuel Arregui | Radial piston pump |
DE3601714A1 (en) * | 1986-01-22 | 1987-07-23 | Draegerwerk Ag | DEVICE FOR ENRICHING BREATHING GAS WITH OXYGEN |
EP0239713A1 (en) | 1986-04-02 | 1987-10-07 | VOEST-ALPINE Aktiengesellschaft | Process for purifying gases and device for performing the process |
US4706664A (en) * | 1986-04-11 | 1987-11-17 | Puritan-Bennett Corporation | Inspiration oxygen saver |
US4869733A (en) * | 1986-05-22 | 1989-09-26 | Vbm Corporation | Super-enriched oxygen generator |
US4673415A (en) * | 1986-05-22 | 1987-06-16 | Vbm Corporation | Oxygen production system with two stage oxygen pressurization |
EP0247365A3 (en) * | 1986-05-30 | 1988-08-10 | Körber Ag | Filling apparatus for oxygen bottles for use in the medicinal oxygen therapy |
US4698075A (en) | 1986-06-05 | 1987-10-06 | International Oxygen Company, Inc. | Control system for fluid absorption systems and the like |
US4765804A (en) * | 1986-10-01 | 1988-08-23 | The Boc Group, Inc. | PSA process and apparatus employing gaseous diffusion barriers |
DE3712598A1 (en) * | 1987-04-14 | 1988-10-27 | Siemens Ag | INHALATION ANESTHESIS DEVICE |
JPS63307101A (en) | 1987-06-05 | 1988-12-14 | Kobe Steel Ltd | Pressure swing adsorption type production of oxygen |
JPS6428208A (en) | 1987-07-22 | 1989-01-30 | Sumiyoshi Heavy Ind | Equipment for production and supply of nitrogen gas |
JPH062576Y2 (en) | 1987-08-10 | 1994-01-26 | 株式会社吉野工業所 | Container with makeup brush |
ES2009156A6 (en) * | 1988-01-11 | 1989-09-01 | Desarrollos Estudios Y Patente | Installation for the supply of oxygen in hospitals and the like. |
US4957107A (en) * | 1988-05-10 | 1990-09-18 | Sipin Anatole J | Gas delivery means |
US4948391A (en) | 1988-05-12 | 1990-08-14 | Vacuum Optics Corporation Of Japan | Pressure swing adsorption process for gas separation |
DE3817092A1 (en) * | 1988-05-19 | 1989-11-30 | Draegerwerk Ag | CONVEYOR DEVICE FOR SUPPLYING A VENTILATOR WITH BREATHING GAS |
US5049039A (en) * | 1988-06-29 | 1991-09-17 | Pneumotor, Inc. | Radial piston and cylinder compressed gas motor |
US4867766A (en) * | 1988-09-12 | 1989-09-19 | Union Carbide Corporation | Oxygen enriched air system |
US4860803A (en) * | 1988-09-15 | 1989-08-29 | The United States Of America As Represented By The Department Of Commerce | Continuous nitrox mixer |
GB8826867D0 (en) | 1988-11-17 | 1988-12-21 | Normalair Garrett Ltd | Fluid compressors |
US4880443A (en) | 1988-12-22 | 1989-11-14 | The United States Of America As Represented By The Secretary Of The Air Force | Molecular sieve oxygen concentrator with secondary oxygen purifier |
US4979882A (en) * | 1989-03-13 | 1990-12-25 | Wisconsin Alumni Research Foundation | Spherical rotary machine having six rotary pistons |
US5144945A (en) * | 1989-04-20 | 1992-09-08 | Nippon Sanso Kabushiki Kaisha | Portable oxygen-enriching air inhaler |
FR2647431B1 (en) | 1989-05-24 | 1991-08-16 | Air Liquide | PROCESS AND PLANT FOR THE PRODUCTION OF HIGH-PRESSURE GASEOUS OXYGEN |
US4974554A (en) | 1989-08-17 | 1990-12-04 | Emery Lloyd H | Compound rod, sleeve and offset crankshaft assembly |
US5071453A (en) * | 1989-09-28 | 1991-12-10 | Litton Systems, Inc. | Oxygen concentrator with pressure booster and oxygen concentration monitoring |
US5154737A (en) | 1990-01-12 | 1992-10-13 | Vbm Corporation | System for eliminating air leakage and high purity oxygen of a PSA oxygen concentrator |
GB9003033D0 (en) * | 1990-02-10 | 1990-04-11 | Normalair Garrett Ltd | Oxygen-rich gas breathing systems |
US5237987A (en) * | 1990-06-07 | 1993-08-24 | Infrasonics, Inc. | Human lung ventilator system |
JPH089992B2 (en) * | 1990-06-19 | 1996-01-31 | トキコ株式会社 | Multi-stage compressor |
US5163978A (en) * | 1991-10-08 | 1992-11-17 | Praxair Technology, Inc. | Dual product pressure swing adsorption process and system |
US5207806A (en) * | 1991-10-08 | 1993-05-04 | Praxair Technology, Inc. | Dual product pressure swing adsorption and membrane operations |
GB9124156D0 (en) | 1991-11-14 | 1992-01-08 | Boc Group Plc | Compressing oxygen |
GB2272492B (en) * | 1992-11-11 | 1996-05-01 | Dowty Defence & Air Syst | Gas supply apparatus |
EP0609620B1 (en) | 1993-01-30 | 1999-02-10 | The BOC Group plc | Gas separation |
US5326231A (en) | 1993-02-12 | 1994-07-05 | Bristol Compressors | Gas compressor construction and assembly |
EP0626516B1 (en) * | 1993-04-15 | 1997-06-04 | KNF Neuberger GmbH | Lubricant-free vacuum pump arrangement |
US5354361A (en) * | 1993-05-28 | 1994-10-11 | Litton Industries, Inc. | Energy recovering pressure balance scheme for a combination pressure swing absorber with a boost compressor |
US5474595A (en) * | 1994-04-25 | 1995-12-12 | Airsep Corporation | Capacity control system for pressure swing adsorption apparatus and associated method |
US5593478A (en) * | 1994-09-28 | 1997-01-14 | Sequal Technologies, Inc. | Fluid fractionator |
FR2726332B1 (en) | 1994-10-26 | 1997-01-24 | Francois Couillard | PISTON PUMPING SYSTEM DELIVERING FLUIDS WITH SUBSTANTIALLY CONSTANT FLOW RATE |
US5531807A (en) | 1994-11-30 | 1996-07-02 | Airsep Corporation | Apparatus and method for supplying oxygen to passengers on board aircraft |
US5704964A (en) * | 1994-12-27 | 1998-01-06 | Nippon Sanso Corporation | Pressure swing adsorption process |
US5709536A (en) * | 1995-01-30 | 1998-01-20 | Titan Tool, Inc. | Hydro mechanical packingless pump and liquid spray system |
US5593291A (en) * | 1995-07-25 | 1997-01-14 | Thomas Industries Inc. | Fluid pumping apparatus |
US5611845A (en) * | 1995-08-22 | 1997-03-18 | Undersea Breathing Systems, Inc. | Oxygen enriched air generation system |
US5823186A (en) * | 1996-06-20 | 1998-10-20 | Dragerwerk Ag | Respirator |
US5897305A (en) | 1996-08-08 | 1999-04-27 | Roddis; Gravatt Keith | Valve assembly for compressors |
US5863186A (en) | 1996-10-15 | 1999-01-26 | Green; John S. | Method for compressing gases using a multi-stage hydraulically-driven compressor |
US5858062A (en) * | 1997-02-10 | 1999-01-12 | Litton Systems, Inc. | Oxygen concentrator |
US5908053A (en) * | 1997-02-10 | 1999-06-01 | Litton Systems, Inc. | Integrated high pressure fill port and flow controller for cylinder recharger |
CA2228779A1 (en) | 1997-02-24 | 1998-08-24 | Emanuel D. Fry | Two-piece piston |
DE19714644C2 (en) * | 1997-04-09 | 1999-09-02 | Draegerwerk Ag | Gas delivery device for ventilators and anesthetic devices and their use |
US6092993A (en) * | 1997-08-14 | 2000-07-25 | Bristol Compressors, Inc. | Adjustable crankpin throw structure having improved throw stabilizing means |
US5893275A (en) * | 1997-09-04 | 1999-04-13 | In-X Corporation | Compact small volume liquid oxygen production system |
KR19990028153A (en) * | 1997-09-30 | 1999-04-15 | 정휘동 | Portable PS Oxygen Generator |
FR2788307B1 (en) | 1999-01-07 | 2001-03-09 | Daniel Drecq | TWO- OR FOUR-TIME INTERNAL COMBUSTION COMPRESSOR ENGINE |
US6183211B1 (en) * | 1999-02-09 | 2001-02-06 | Devilbiss Air Power Company | Two stage oil free air compressor |
US6346139B1 (en) * | 1999-05-12 | 2002-02-12 | Respironics, Inc. | Total delivery oxygen concentration system |
DE19958532C1 (en) * | 1999-05-18 | 2001-01-18 | Draeger Medizintech Gmbh | Respiration apparatus uses gas volume sensors coupled to measuring and regulating device for gas feed element and controlled blocking valve for supplying patient with defined respiration gas volume |
US6393802B1 (en) * | 1999-12-22 | 2002-05-28 | Sunrise Medical Hhg, Inc. | Cylinder filler for use with an oxygen concentrator |
US6345965B1 (en) | 2000-03-06 | 2002-02-12 | Eeftec International, Inc. | Dual stage compressor |
US6651658B1 (en) * | 2000-08-03 | 2003-11-25 | Sequal Technologies, Inc. | Portable oxygen concentration system and method of using the same |
US6684755B2 (en) | 2002-01-28 | 2004-02-03 | Bristol Compressors, Inc. | Crankshaft, compressor using crankshaft, and method for assembling a compressor including installing crankshaft |
DE10205955A1 (en) | 2002-02-12 | 2003-08-21 | Weinmann G Geraete Med | Method and device for providing breathing gas |
NO316090B1 (en) | 2002-03-21 | 2003-12-08 | Nat Oilwell Norway As | Device at piston machine valve such as pump and compressor |
US6889726B2 (en) | 2002-10-25 | 2005-05-10 | Invacare Corporation | Method and apparatus for filling portable high pressure cylinders with respiratory oxygen |
US6823891B2 (en) | 2003-02-25 | 2004-11-30 | Copeland Corporation | Compressor suction reed valve |
JP4269260B2 (en) | 2003-06-05 | 2009-05-27 | 三浦工業株式会社 | valve |
US7244107B2 (en) | 2005-03-24 | 2007-07-17 | Merits Health Products Co., Ltd. | Home oxygen-compression apparatus |
US8062003B2 (en) | 2005-09-21 | 2011-11-22 | Invacare Corporation | System and method for providing oxygen |
-
1997
- 1997-10-01 US US08/942,063 patent/US5988165A/en not_active Expired - Lifetime
-
1998
- 1998-09-16 AU AU94880/98A patent/AU715855B2/en not_active Ceased
- 1998-09-16 DE DE69819469T patent/DE69819469T2/en not_active Expired - Lifetime
- 1998-09-16 US US09/154,442 patent/US6302107B1/en not_active Expired - Lifetime
- 1998-09-16 EP EP98948271A patent/EP0948385B1/en not_active Expired - Lifetime
- 1998-09-16 CA CA002269555A patent/CA2269555C/en not_active Expired - Fee Related
- 1998-09-16 WO PCT/US1998/019282 patent/WO1999016529A2/en active IP Right Grant
-
2001
- 2001-09-14 US US09/952,763 patent/US6805122B2/en not_active Expired - Lifetime
- 2001-10-24 WO PCT/US2001/045433 patent/WO2002034368A1/en active IP Right Grant
- 2001-10-24 AU AU1800302A patent/AU1800302A/en active Pending
- 2001-10-24 CA CA2426685A patent/CA2426685C/en not_active Expired - Fee Related
- 2001-10-24 EP EP01988512A patent/EP1345670B1/en not_active Expired - Lifetime
-
2002
- 2002-09-13 WO PCT/US2002/029164 patent/WO2003024569A1/en not_active Application Discontinuation
-
2003
- 2003-10-23 US US10/605,754 patent/US6923180B2/en not_active Expired - Lifetime
-
2005
- 2005-07-13 US US11/180,395 patent/US7294170B2/en not_active Expired - Fee Related
-
2007
- 2007-11-12 US US11/938,551 patent/US8123497B2/en not_active Expired - Fee Related
-
2012
- 2012-02-24 US US13/404,848 patent/US20120152248A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2956738A (en) * | 1957-12-10 | 1960-10-18 | Atlas Copco Ab | Reciprocating cross-head compressors |
US4381179A (en) * | 1980-10-31 | 1983-04-26 | Lear Siegler, Inc. | Pumps with floating wrist pins |
US5033940A (en) * | 1989-01-19 | 1991-07-23 | Sulzer Brothers Limited | Reciprocating high-pressure compressor piston with annular clearance |
US5099748A (en) * | 1990-05-11 | 1992-03-31 | Genie Industries, Inc. | Pneumatic system for telescopic hoist |
US5078580A (en) * | 1991-03-29 | 1992-01-07 | Dresser-Rand Company | Plural-stage gas compressor |
US6805122B2 (en) * | 1997-10-01 | 2004-10-19 | Invacare Corporation | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
US7204249B1 (en) * | 1997-10-01 | 2007-04-17 | Invcare Corporation | Oxygen conserving device utilizing a radial multi-stage compressor for high-pressure mobile storage |
Cited By (23)
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US11185655B2 (en) | 2015-03-24 | 2021-11-30 | Ventec Life Systems, Inc. | Passive leak valve |
US11247015B2 (en) | 2015-03-24 | 2022-02-15 | Ventec Life Systems, Inc. | Ventilator with integrated oxygen production |
US10758699B2 (en) | 2015-03-24 | 2020-09-01 | Ventec Life Systems, Inc. | Secretion trap |
US10046134B2 (en) | 2015-03-24 | 2018-08-14 | Ventec Life Systems, Inc. | Pressure swing adsorption oxygen generator |
US10105509B2 (en) | 2015-03-24 | 2018-10-23 | Ventec Life Systems, Inc. | Active exhalation valve |
US10245406B2 (en) | 2015-03-24 | 2019-04-02 | Ventec Life Systems, Inc. | Ventilator with integrated oxygen production |
US10315002B2 (en) | 2015-03-24 | 2019-06-11 | Ventec Life Systems, Inc. | Ventilator with integrated oxygen production |
US10518059B2 (en) | 2015-03-24 | 2019-12-31 | Ventec Life Systems, Inc. | Passive leak valve |
US10576237B2 (en) | 2015-03-24 | 2020-03-03 | Ventec Life Systems, Inc. | Active exhalation valve |
US11992619B2 (en) | 2015-03-24 | 2024-05-28 | Ventec Life Systems, Inc. | Ventilator with integrated cough-assist |
US9956371B2 (en) | 2015-03-24 | 2018-05-01 | Ventec Life Systems, Inc. | Ventilator with integrated cough-assist |
US11344692B2 (en) | 2015-03-24 | 2022-05-31 | Ventec Life Systems, Inc. | Respiratory therapy systems and methods |
US11291791B2 (en) | 2015-03-24 | 2022-04-05 | Ventee Life Systems, Inc. | Ventilator with integrated cough-assist |
US11992611B2 (en) | 2015-04-02 | 2024-05-28 | Hill-Rom Services Pte. Ltd. | Respiratory therapy apparatus control |
US10905836B2 (en) | 2015-04-02 | 2021-02-02 | Hill-Rom Services Pte. Ltd. | Manifold for respiratory device |
US10905837B2 (en) | 2015-04-02 | 2021-02-02 | Hill-Rom Services Pte. Ltd. | Respiratory therapy cycle control and feedback |
US20170354432A1 (en) * | 2016-06-14 | 2017-12-14 | Medaxis Ag | Pump module |
US10653439B2 (en) * | 2016-06-14 | 2020-05-19 | Medaxis Ag | Pump module |
US11679229B2 (en) | 2016-06-21 | 2023-06-20 | Ventec Life Systems, Inc. | Cough-assist systems with humidifier bypass |
US10773049B2 (en) | 2016-06-21 | 2020-09-15 | Ventec Life Systems, Inc. | Cough-assist systems with humidifier bypass |
WO2018058173A1 (en) * | 2016-09-27 | 2018-04-05 | Freo2 Pty Ptd | Apparatus for delivering a therapeutic gas |
US11191915B2 (en) | 2018-05-13 | 2021-12-07 | Ventec Life Systems, Inc. | Portable medical ventilator system using portable oxygen concentrators |
CN111550382A (en) * | 2019-08-23 | 2020-08-18 | 株式会社神户制钢所 | Compressor unit |
Also Published As
Publication number | Publication date |
---|---|
US20040103895A1 (en) | 2004-06-03 |
US20060000474A1 (en) | 2006-01-05 |
US5988165A (en) | 1999-11-23 |
CA2269555C (en) | 2004-10-05 |
CA2269555A1 (en) | 1999-04-08 |
WO1999016529A2 (en) | 1999-04-08 |
US6805122B2 (en) | 2004-10-19 |
CA2426685A1 (en) | 2002-05-02 |
EP0948385B1 (en) | 2003-11-05 |
US7294170B2 (en) | 2007-11-13 |
AU1800302A (en) | 2002-05-06 |
DE69819469D1 (en) | 2003-12-11 |
US8123497B2 (en) | 2012-02-28 |
EP1345670A1 (en) | 2003-09-24 |
US6302107B1 (en) | 2001-10-16 |
US20080118373A1 (en) | 2008-05-22 |
DE69819469T2 (en) | 2004-05-13 |
CA2426685C (en) | 2011-09-13 |
WO1999016529A3 (en) | 1999-06-24 |
US20020014237A1 (en) | 2002-02-07 |
WO2003024569A1 (en) | 2003-03-27 |
AU9488098A (en) | 1999-04-23 |
AU715855B2 (en) | 2000-02-10 |
US6923180B2 (en) | 2005-08-02 |
EP1345670B1 (en) | 2007-01-03 |
EP0948385A2 (en) | 1999-10-13 |
WO2002034368A1 (en) | 2002-05-02 |
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