CN107050597B - Medical compressed air supply device and control method thereof - Google Patents
Medical compressed air supply device and control method thereof Download PDFInfo
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- CN107050597B CN107050597B CN201710221826.4A CN201710221826A CN107050597B CN 107050597 B CN107050597 B CN 107050597B CN 201710221826 A CN201710221826 A CN 201710221826A CN 107050597 B CN107050597 B CN 107050597B
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- 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
- A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
-
- 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
- A61M16/105—Filters
- A61M16/106—Filters in a path
- A61M16/1065—Filters in a path in the expiratory path
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
-
- 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
-
- 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
- B01D53/26—Drying gases or vapours
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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
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/06—Combinations of two or more 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
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/02—Stopping, starting, unloading or idling control
-
- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/18—General characteristics of the apparatus with alarm
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- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/33—Controlling, regulating or measuring
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- 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
- A61M2205/00—General characteristics of the apparatus
- A61M2205/36—General characteristics of the apparatus related to heating or cooling
- A61M2205/3606—General characteristics of the apparatus related to heating or cooling cooled
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/91—Bacteria; Microorganisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2279/00—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses
- B01D2279/65—Filters adapted for separating dispersed particles from gases or vapours specially modified for specific uses for the sterilisation of air
Abstract
The invention discloses a medical compressed air supply device and a control method thereof, wherein the device comprises a first air compressor and a second air compressor which are arranged in parallel, an air storage tank, a first filter, a second filter, an air dryer, a sterilizing filter and a controller which are connected in sequence; the outlet pipeline of the first air compressor is provided with a first pressure transmitter and a first electromagnetic valve, and the outlet pipeline of the second air compressor is provided with a second pressure transmitter and a second electromagnetic valve. The controller acquires the outlet air pressure of the first air compressor or the second air compressor in real time and judges, and timely switches the use and standby states of the first air compressor and the second air compressor, so that the stable operation of one air compressor is ensured all the time, the stable air pressure is continuously provided, and the life safety of a patient using the breathing mask is ensured.
Description
Technical Field
The invention relates to the technical field of medical equipment, in particular to a medical compressed air supply device and a control method thereof.
Background
Ventilators have become an indispensable conventional medical device in medical institutions and are widely used in various clinical departments, particularly emergency and intensive care units. The gas supply device of the breathing machine comprises a compressed air supply device and an oxygen supply device, the compressed air provided by the compressed air supply device and the oxygen provided by the oxygen supply device are mixed according to a certain proportion and then are conveyed to the respiratory mask for patients to use.
In the prior art, almost no standby air compressor is used for the medical breathing machine, or a standby air compressor is arranged, and when one air compressor fails, an operator switches to the other compressor manually, however, the standby air compressor is not used or is not switched timely, so that life danger is caused for a patient needing to use breathing air timely; and because the air compressor is out of order, the process of manually switching by an operator is longer, the pressure of the supplied air is too high or too low, and different influences are caused on patients.
Accordingly, the prior art is still in need of improvement and development.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a medical compressed air supply device and a control method thereof, which aim to automatically start up a standby compressor when an air compressor fails, and ensure to provide stable compressed air.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a medical compressed air supply device comprises a first air compressor and a second air compressor which are arranged in parallel, an air storage tank, a first filter, a second filter, an air dryer, a sterilizing filter and a controller which are connected in sequence; the outlet pipeline of the first air compressor and the outlet pipeline of the second air compressor are connected in parallel and then connected with the inlet of the air storage tank; the outlet pipeline of the first air compressor is provided with a first pressure transmitter and a first electromagnetic valve, and the outlet pipeline of the second air compressor is provided with a second pressure transmitter and a second electromagnetic valve; the air storage tank is provided with a third pressure transmitter, and an outlet pipeline of the air storage tank is provided with a third electromagnetic valve; a fourth pressure transmitter is arranged on an outlet pipeline of the air dryer; the first air compressor, the second air compressor, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are respectively connected with the controller.
The medical compressed air supply device comprises a first air compressor and a second air compressor, wherein the first air compressor and the second air compressor are piston type air compressors.
In the medical compressed air supply device, the first air compressor and the second air compressor respectively comprise a set of cooling water system, and each set of cooling water system respectively comprises a water pump, a first water tank, a second water tank, a cooling water pipe, a first water tank inlet electromagnetic valve, a first water tank outlet electromagnetic valve, a second water tank inlet electromagnetic valve and a second water tank outlet electromagnetic valve; the outlet pipelines of the first water tank and the second water tank are connected in parallel and then are connected with the inlet of the water pump, the inlet pipelines of the first water tank and the second water tank are connected in parallel and then are connected to one end of the cooling water pipe, and the other end of the cooling water pipe is connected to the outlet of the water pump; the water pump, the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are respectively connected with the controller.
In the medical compressed air supply device, a tube-fin heat exchanger and a fan which is arranged corresponding to the tube-fin heat exchanger are respectively arranged on the cooling water tube of each set of cooling water system; and each fan is connected with the controller respectively.
The medical compressed air supply device also comprises a display, an external input device and an alarm which are respectively connected with the controller.
In the medical compressed air supply device, the air dryer is an adsorption dryer.
In the medical compressed air supply device, the controller comprises a first DSP controller and a second DSP controller which are connected through a serial port; the first air compressor, the first pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the first electromagnetic valve, a water pump of a cooling water system of the first air compressor, a first water tank inlet electromagnetic valve, a first water tank outlet electromagnetic valve, a second water tank inlet electromagnetic valve and a second water tank outlet electromagnetic valve are respectively connected with the first DSP controller; the second air compressor, the second pressure transmitter, the second electromagnetic valve, a water pump of a cooling water system of the second air compressor, the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are respectively connected with the second DSP controller.
The invention also provides a control method of the medical compressed air supply device correspondingly, which comprises the following steps:
s100, presetting a lower limit P1 and an upper limit P2 of outlet air pressure values of a first air compressor and a second air compressor in a controller, and an air storage tank air pressure value P3 and an air dryer outlet air pressure value P4;
s200, the controller receives a starting instruction to respectively control the first electromagnetic valve to be opened, the second electromagnetic valve to be closed and the first air compressor to operate, and then the step S310 and the step S320 are simultaneously executed;
s310, detecting an actual air pressure value P5 in the air storage tank by the third pressure transmitter, feeding back a detection result to the controller, receiving the detection value fed back by the third pressure transmitter by the controller, comparing the detection value P5 with the detection value P3, controlling the third electromagnetic valve to be closed if P4 is smaller than P3, and controlling the third electromagnetic valve to be opened if P4 is larger than or equal to P3;
s320, detecting an actual air pressure value P6 at an outlet of the first air compressor by a first pressure transmitter, feeding back a detection result to a controller, receiving the detection value fed back by the first pressure transmitter by the controller, comparing P6 with P1 and P2, if P1 is less than or equal to P6 and less than or equal to P2, keeping the first air compressor to continue to operate, if P6 is less than P1 or P6 is more than P2, respectively controlling the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, stopping the operation of the first air compressor and the operation of the second air compressor by the controller, and then executing step S330;
s330, the second pressure transmitter detects the actual air pressure value P7 at the outlet of the second air compressor and feeds back the detection result to the controller, the controller receives the detection value fed back by the second pressure transmitter and compares P7 with P1 and P2, if P1 is less than or equal to P7 and less than or equal to P2, the second air compressor is kept to continue to operate, if P7 is less than P1 or P7 is more than P2, the controller respectively controls the second electromagnetic valve to be closed, the first electromagnetic valve to be opened, the second air compressor is stopped to operate, and the first air compressor is operated, and then step S320 is executed.
Further, in the method for controlling a medical compressed air supply apparatus, the step S100 further includes: presetting a first water tank and a second water tank switching interval time T1 in a controller;
the step S320 further includes: controlling the water pump of the first air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once;
the step S330 further includes: controlling the water pump of the second air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once.
Further, the step S310 further includes: the fourth pressure transmitter detects the actual air pressure value P8 at the outlet of the air dryer and feeds the detection result back to the controller, the controller receives the detection value fed back by the fourth pressure transmitter and compares P8 with P4, and if P8 is smaller than P4, the controller controls the alarm to sound.
The beneficial effects are that:
the invention provides a medical compressed air supply device and a control method thereof, wherein a first air compressor and a second air compressor are arranged in parallel, a first electromagnetic valve and a first pressure transmitter are arranged at an outlet of the first air compressor, a second electromagnetic valve and a second pressure transmitter are arranged at an outlet of the second air compressor, the outlet air pressure of the first air compressor or the outlet air pressure of the second air compressor are acquired in real time through a controller and judged, the use and standby states of the first air compressor and the second air compressor are switched in time, the stable operation of one air compressor is ensured all the time, the stable air pressure is continuously provided, the stability of compressed air is further improved through the buffer function of an air storage tank, and the life safety of a patient using a respiratory mask is ensured.
Drawings
Fig. 1 is a schematic diagram of the operation of the medical compressed air supply apparatus according to the present invention.
Fig. 2 is a schematic diagram of the operation of the cooling water system of the first air compressor and the second air compressor in the medical compressed air supply apparatus according to the present invention.
Fig. 3 is a schematic diagram of the operation of the adsorption type air dryer in the medical compressed air supply apparatus according to the present invention.
Fig. 4 is a flow chart of a control method of the medical compressed air supply apparatus provided by the invention.
Detailed Description
The invention provides a medical compressed air supply device and a control method thereof, which are used for making the purpose, technical scheme and effect of the invention clearer and more definite, and the invention is further described in detail below by referring to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring first to fig. 1, the present invention provides a medical compressed air supply apparatus, which includes a first air compressor 110 and a second air compressor 120 arranged in parallel, an air tank 20, a first filter 31, a second filter 32, an air dryer 40, a sterilizing filter 33, and a controller (not shown in the figure) connected in sequence; the outlet pipe of the first air compressor 110 and the outlet pipe of the second air compressor 120 are connected in parallel and then connected with the inlet of the air storage tank 20; a first pressure transmitter 51 and a first electromagnetic valve 61 are arranged on an outlet pipeline of the first air compressor, and a second pressure transmitter 52 and a second electromagnetic valve 62 are arranged on an outlet pipeline of the second air compressor; the air storage tank is provided with a third pressure transmitter 53, and an outlet pipeline of the air storage tank is provided with a third electromagnetic valve 63; a fourth pressure transmitter 54 is arranged on an outlet pipeline of the air dryer; the first air compressor 110, the second air compressor 120, the first pressure transmitter 51, the second pressure transmitter 52, the third pressure transmitter 53, the fourth pressure transmitter 54, the first solenoid valve 61, the second solenoid valve 62, and the third solenoid valve 63 are connected to the controller, respectively.
When the air compressor works, the first air compressor is started, the first electromagnetic valve is opened, the second air compressor is in a standby state, and the second electromagnetic valve is closed. The first air compressor is used for conveying compressed air into the air storage tank to be buffered so as to provide stable air pressure, when the third pressure transmitter is used for detecting that the air pressure of the air storage tank reaches a normal value, the third electromagnetic valve is opened, the compressed air enters the first filter and the second filter to be filtered so as to remove impurities in the compressed air to form clean air, the filtered compressed air further enters the air dryer to be dried, the dried compressed air is further subjected to sterilization and filtration, and finally the air is mixed with oxygen and conveyed to the breathing mask for patients to use. The top of the gas storage tank is provided with a safety valve, and when the gas pressure in the gas storage tank exceeds a safety value, the safety valve automatically jumps, so that the over-pressure in the gas storage tank is avoided.
When the controller receives that the first pressure transmitter detects that the actual air pressure value of the outlet of the first air compressor exceeds the normal range, the controller respectively controls the first air compressor to stop running, the first electromagnetic valve to be closed, the second air compressor to be opened and the second electromagnetic valve to be opened, the device can continuously provide air with stable pressure, and when a maintenance person removes the first air compressor, the first air compressor is re-connected into the medical compressed air supply device and is in a standby state. If the controller receives that the second pressure transmitter detects that the actual air pressure value of the outlet of the second air compressor exceeds the normal range, the controller respectively controls the second air compressor to stop running, the second electromagnetic valve to be closed, the first air compressor to be opened and the first electromagnetic valve to be opened. The operation states of the first air compressor and the second air compressor are circularly and repeatedly switched, so that the medical compressed air supply device is ensured to always have one air compressor in normal operation, and the automatic switching process is rapid, so that stable compressed air can be continuously provided, and the life safety of a patient using a respiratory mask is ensured.
Preferably, the first filter 31 is a water removal filter, and the second filter 32 is an oil removal filter, so as to remove liquid water and oil carried in the compressed air. Preferably, the first air compressor 110 and the second air compressor 120 are both piston air compressors.
The first air compressor and the second air compressor have the same specification, as shown in fig. 2, the first air compressor and the second air compressor respectively comprise a set of cooling water systems, and each set of cooling water systems respectively comprises a water pump 73, a first water tank 711, a second water tank 712, a cooling water pipe 76, a first water tank inlet electromagnetic valve 751, a first water tank outlet electromagnetic valve 721, a second water tank inlet electromagnetic valve 752 and a second water tank outlet electromagnetic valve 722; the outlet pipelines of the first water tank 711 and the second water tank 712 are connected in parallel and then are connected with the inlet of the water pump, the inlet pipelines of the first water tank 711 and the second water tank 712 are connected in parallel and then are connected to one end of a cooling water pipe (the section of cooling water pipe specifically belongs to a water return pipe), and the other end of the cooling water pipe (the section of cooling water pipe specifically belongs to a water inlet pipe) is connected to the outlet of the water pump; the water pump 73, the first tank inlet solenoid valve 751, the first tank outlet solenoid valve 721, the second tank inlet solenoid valve 752, and the second tank outlet solenoid valve 722 are respectively connected to a controller. The cooling water pipe further comprises a plurality of branch pipes, and the branch pipes are connected to the air inlet cylinder, the interlayer of the air outlet cylinder and the like of the air compressor, which are in the prior art and are not shown in fig. 2.
When the air compressor runs, one of the first water tank and the second water tank is in a use state, the other one of the first water tank and the second water tank is in a standby state, and after a period of time, the use state and the standby state of the first water tank and the second water tank are switched once. For example, after the first water tank is used for a period of time, the water temperature gradually rises, the first water tank inlet electromagnetic valve and the first water tank outlet electromagnetic valve are closed, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are opened, so that cooling water in the second water tank is used, and the cooling water in the first water tank can be naturally cooled. When the second water tank is used for a period of time, the first water tank is switched to again, and the first water tank and the second water tank are switched repeatedly in a circulating way, so that circulating water in the cooling water system is always in a normal temperature range. Particularly when the ambient temperature is lower, the energy-saving effect of cooling the circulating water through the mode is obvious.
Further, when the temperature is high in summer, the water in the water tank is difficult to be quickly cooled to a normal range only by natural cooling, and therefore, the embodiment is further improved, and a tube fin heat exchanger 741 and a fan 742 which is arranged corresponding to the tube fin heat exchanger are respectively arranged on the cooling water pipes of each set of cooling water system; the fans 742 are respectively connected to the controller. Namely, when the temperature is high in summer, the condensing fan is started, and circulating water can be obviously radiated and cooled through the tube-fin heat exchanger, so that the normal operation of the compressor is ensured.
Further, the medical compressed air supply apparatus further comprises a display, an external input device and an alarm (not shown in the figure) which are respectively connected with the controller. The display may be used to display operational status and fault information of the medical compressed air supply apparatus, such as: the air pressure at the outlet of the first air compressor, the air pressure at the outlet of the second air compressor, the air pressure in the buffer tank, the air pressure at the outlet of the air dryer, and the like.
Preferably, the air dryer 40 is an adsorption dryer.
Further, considering that the adsorbent generates dust due to extrusion and impact, a dust removing filter (not shown in the figure) is further disposed between the outlet of the dryer and the inlet of the sterilizing filter, and the filtering precision of the dust removing filter is 1-5 micrometers, so that the air which is dry and clean is ensured to be provided.
In the medical compressed air supply apparatus, the controller may be a PLC (programmable logic controller). In addition, for the setting of the controller, this embodiment also provides a lower cost solution: the controller comprises a first DSP (namely Digital Signal Process, digital signal processing) controller and a second DSP controller (not shown in the figure) which are connected through a serial port; the first air compressor, the first pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the first electromagnetic valve, a water pump of a cooling water system of the first air compressor, a first water tank inlet electromagnetic valve, a first water tank outlet electromagnetic valve, a second water tank inlet electromagnetic valve and a second water tank outlet electromagnetic valve are respectively connected with the first DSP controller; the second air compressor, the second pressure transmitter, the second electromagnetic valve, a water pump of a cooling water system of the second air compressor, the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are respectively connected with the second DSP controller; the display, the external input device, the alarm and the two condensing fans are also connected with the second DSP controller. The driving motor of the first air compressor is connected with the first DSP controller through an L298 motor driving plate, and the driving motor of the second air compressor is connected with the second DSP controller through an L298 motor driving plate; each electromagnetic valve is connected to the corresponding first controller or second DSP controller through a relay. In the scheme, the two DSP controllers are connected through the serial port, namely, enough I/O interfaces are provided to ensure the normal control of the medical compressed air supply device, and compared with the PLC, the cost is greatly reduced.
Further, considering that the adsorption dryer in the prior art has only two adsorption cylinders, if the adsorbents in the two adsorption cylinders fail at the same time, the compressed air cannot be sufficiently dried, which threatens the life safety of the patient breathing by using the breathing mask, the embodiment is further improved, and an air dryer is provided so as to meet that the drying process of the compressed air can be continuously performed.
Referring to fig. 3, the adsorption type air dryer includes three vertically arranged adsorption cylinders 410, an inlet manifold 481, an outlet manifold 482 and a dryer controller (not shown), which is preferably a single-chip microcomputer; the inlet pipe of each adsorption cylinder 410 is connected to the inlet manifold 481 in parallel, and the outlet pipe at the top of each adsorption cylinder 410 is connected to the outlet manifold 482 in parallel; an electromagnetic valve A (421) is arranged on the upper pipeline of the air inlet pipeline at the bottom of each adsorption cylinder; the outlet pipelines of any two adsorption cylinders are respectively connected through an electromagnetic valve B (422); the bottom of each adsorption cylinder is provided with an exhaust pipe 440, each exhaust pipe is provided with a solenoid valve C (423) respectively; the electromagnetic valve A (421), the electromagnetic valve B (422) and the electromagnetic valve C (423) are respectively connected with the controller. In practical application, the adsorption type air dryer is further provided with a bottom frame (not shown in the figure), each adsorption cylinder is vertically arranged on the bottom frame through two or three supporting legs (not shown in the figure), and the dryer controller is arranged on the bottom frame. Preferably, each adsorption cylinder is provided with an activated alumina adsorbent.
Through the setting, every time this adsorption type air dryer operates for a certain time (namely an operation period), the controller switches the use states of three adsorption cylinders by controlling the opening and closing states of all electromagnetic valves, so that one adsorption cylinder among the three adsorption cylinders is always in the use state, one adsorption cylinder is in the adsorbent regeneration state, and the adsorbent in the standby adsorption cylinder can ensure that the adsorption cylinder can smoothly complete an operation period after being put into operation. The states of the adsorption cylinders are cyclically switched according to the sequence of use, regeneration and standby.
For convenience of explanation, the three adsorption cylinders from left to right as shown in fig. 1 are respectively named as a first adsorption cylinder, a second adsorption cylinder and a third adsorption cylinder. The first adsorption cylinder is used, the second adsorption cylinder is regenerated, and the third adsorption cylinder is used as an example.
The electromagnetic valve A and the electromagnetic valve B of the first adsorption cylinder are opened, and the other electromagnetic valves A and B are closed; the electromagnetic valve B on the outlet pipeline of the first adsorption cylinder and the second adsorption cylinder is opened, and the other two electromagnetic valves B are closed; the solenoid valve C of the second adsorption cylinder is opened, and the other two solenoid valves C are closed. Compressed air enters an air inlet main pipe, then enters the bottom of a first adsorption cylinder, is discharged from the top after being dried by an adsorbent in the first adsorption cylinder and is divided into two air streams, wherein one air stream enters an air outlet main pipe, and one air stream enters the top of a second adsorption cylinder and flows downwards to take away moisture of the adsorbent in the second adsorption cylinder, and finally is discharged from an exhaust pipe of the second adsorption cylinder, so that the regeneration of the adsorbent in the second adsorption cylinder is realized. And the third adsorption cylinder is in standby, the quality inspector detects and analyzes to determine whether the adsorbent is invalid, judges that the adsorbent can ensure that the adsorption cylinder successfully completes the next operation period, and if the adsorbent cannot be replaced, the third adsorption cylinder indicates that the adsorbent is replaced, and the operator replaces the adsorbent. When in actual operation, the states of the three adsorption cylinders are circularly switched, and after each switching, quality inspection personnel need to detect and analyze the adsorbent of the adsorption cylinder in a standby state, so that after each switching of the operation state of the adsorption cylinder, the adsorbent in the adsorption cylinder in a use state can smoothly complete one operation period, and the drying machine can continuously and fully dry compressed air.
Referring to fig. 4, the present invention further provides a corresponding control method for the medical compressed air supply device, which includes the following steps:
s100, presetting a lower limit P1 and an upper limit P2 of outlet air pressure values of a first air compressor and a second air compressor in a controller, and an air storage tank air pressure value P3 and an air dryer outlet air pressure value P4;
s200, the controller receives a starting instruction and respectively controls the first electromagnetic valve to be opened, the second electromagnetic valve to be closed and the first air compressor to operate, namely the driving motor of the first air compressor rotates and starts to compress air; after the first air compressor is started, step S310 and step S320 are simultaneously executed;
s310, detecting an actual air pressure value P5 in the air storage tank by the third pressure transmitter, feeding back a detection result to the controller, receiving the detection value fed back by the third pressure transmitter by the controller, comparing the detection value P5 with the detection value P3, controlling the third electromagnetic valve to be closed if P4 is smaller than P3, and controlling the third electromagnetic valve to be opened if P4 is larger than or equal to P3; namely, the compressed air with stable pressure can be provided by the air storage tank;
s320, detecting an actual air pressure value P6 at an outlet of the first air compressor by a first pressure transmitter, feeding back a detection result to a controller, receiving the detection value fed back by the first pressure transmitter by the controller, comparing P6 with P1 and P2, if P1 is less than or equal to P6 and less than or equal to P2, keeping the first air compressor to continue to operate, if P6 is less than P1 or P6 is more than P2, respectively controlling the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, stopping the operation of the first air compressor and the operation of the second air compressor by the controller, and then executing step S330;
s330, the second pressure transmitter detects the actual air pressure value P7 at the outlet of the second air compressor and feeds back the detection result to the controller, the controller receives the detection value fed back by the second pressure transmitter and compares P7 with P1 and P2, if P1 is less than or equal to P7 and less than or equal to P2, the second air compressor is kept to continue to operate, if P7 is less than P1 or P7 is more than P2, the controller respectively controls the second electromagnetic valve to be closed, the first electromagnetic valve to be opened, the second air compressor is stopped to operate, and the first air compressor is operated, and then step S320 is executed.
The steps S320 and S330 are circularly switched, so that one air compressor is ensured to stably run all the time, and the condition that the pressure of compressed air exceeds the normal range or the compressed air is cut off due to the fact that no standby compressor or manual compressor switching is adopted is avoided, and the life safety of a patient using a respiratory mask is ensured.
Further, the step S100 further includes: presetting a first water tank and a second water tank switching interval time T1 in a controller;
the step S320 further includes: controlling the water pump of the first air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once;
the step S330 further includes: controlling the water pump of the second air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once.
In the scheme, the cooling water system of the first air compressor and the cooling water system of the second air compressor are used and standby in a mode that the first water tank and the second water tank are switched, natural cooling of circulating water is achieved, and the temperature of the circulating water is guaranteed to be in a normal range. In addition, when summer high temperature, can control the operation of condensing fan through the controller, improve the cooling effect of circulating water.
Further, the step S310 further includes: the fourth pressure transmitter detects the actual air pressure value P8 at the outlet of the air dryer and feeds the detection result back to the controller, the controller receives the detection value fed back by the fourth pressure transmitter and compares P8 with P4, and if P8 is smaller than P4, the controller controls the alarm to sound.
In summary, the first air compressor and the second air compressor are arranged in parallel, the first electromagnetic valve and the first pressure transmitter are arranged at the outlet of the first air compressor, the second electromagnetic valve and the second pressure transmitter are arranged at the outlet of the second air compressor, the outlet air pressure of the first air compressor or the outlet air pressure of the second air compressor are acquired in real time through the controller and judged, the use and standby states of the first air compressor and the second air compressor are switched in time, and stable operation of one air compressor all the time and stable air pressure continuously are ensured. Through set up first water tank, second water tank, and tube fin heat exchanger and condensing fan respectively in the cooling water system of first air compressor machine and second air compressor machine for circulating water in each cooling water system is in normal temperature, guarantees that the air compressor machine can normally run. Through set up dewatering filter and deoiling filter before the air dryer import, guarantee that the adsorbent of air dryer is not influenced by the oil film and lose activity, through set up dust filter at the air dryer outlet pipe way, guarantee that the dust that carries in the gas after the drying is filtered.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present invention and their spirit, and all such modifications and substitutions are intended to be included within the scope of the present invention as defined in the following claims.
Claims (8)
1. The medical compressed air supply device is characterized by comprising a first air compressor and a second air compressor which are arranged in parallel, an air storage tank, a first filter, a second filter, an air dryer, a sterilizing filter and a controller which are connected in sequence; the outlet pipeline of the first air compressor and the outlet pipeline of the second air compressor are connected in parallel and then connected with the inlet of the air storage tank; the outlet pipeline of the first air compressor is provided with a first pressure transmitter and a first electromagnetic valve, and the outlet pipeline of the second air compressor is provided with a second pressure transmitter and a second electromagnetic valve; the air storage tank is provided with a third pressure transmitter, and an outlet pipeline of the air storage tank is provided with a third electromagnetic valve; a fourth pressure transmitter is arranged on an outlet pipeline of the air dryer; the first air compressor, the second air compressor, the first pressure transmitter, the second pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are respectively connected with the controller; the first air compressor and the second air compressor respectively comprise a set of cooling water system, and each set of cooling water system respectively comprises a water pump, a first water tank, a second water tank, a cooling water pipe, a first water tank inlet electromagnetic valve, a first water tank outlet electromagnetic valve, a second water tank inlet electromagnetic valve and a second water tank outlet electromagnetic valve; the outlet pipelines of the first water tank and the second water tank are connected in parallel and then are connected with the inlet of the water pump, the inlet pipelines of the first water tank and the second water tank are connected in parallel and then are connected to one end of the cooling water pipe, and the other end of the cooling water pipe is connected to the outlet of the water pump; the water pump, the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are respectively connected with the controller; a tube-fin heat exchanger and a fan arranged corresponding to the tube-fin heat exchanger are respectively arranged on the cooling water tube of each set of cooling water system; each fan is connected with the controller respectively;
the top of gas holder is provided with the relief valve, the relief valve is used for avoiding the gas holder superpressure.
2. The medical compressed air supply apparatus according to claim 1, wherein the first air compressor and the second air compressor are both piston air compressors.
3. The medical compressed air supply apparatus according to claim 1, further comprising a display, an external input device, and an alarm, each connected to the controller.
4. The medical compressed air supply apparatus according to claim 1, wherein the air dryer is an adsorption dryer.
5. The medical compressed air supply apparatus according to claim 4, wherein the controller includes a first DSP controller and a second DSP controller connected through a serial port; the first air compressor, the first pressure transmitter, the third pressure transmitter, the fourth pressure transmitter, the first electromagnetic valve, a water pump of a cooling water system of the first air compressor, a first water tank inlet electromagnetic valve, a first water tank outlet electromagnetic valve, a second water tank inlet electromagnetic valve and a second water tank outlet electromagnetic valve are respectively connected with the first DSP controller; the second air compressor, the second pressure transmitter, the second electromagnetic valve, a water pump of a cooling water system of the second air compressor, the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve are respectively connected with the second DSP controller.
6. The control method of a medical compressed air supply apparatus according to claim 5, characterized by comprising the steps of:
s100, presetting a lower limit P1 and an upper limit P2 of outlet air pressure values of a first air compressor and a second air compressor in a controller, and an air storage tank air pressure value P3 and an air dryer outlet air pressure value P4;
s200, the controller receives a starting instruction to respectively control the first electromagnetic valve to be opened, the second electromagnetic valve to be closed and the first air compressor to operate, and then the step S310 and the step S320 are simultaneously executed;
s310, detecting an actual air pressure value P5 in the air storage tank by the third pressure transmitter, feeding back a detection result to the controller, receiving the detection value fed back by the third pressure transmitter by the controller, comparing the detection value P5 with the detection value P3, controlling the third electromagnetic valve to be closed if P4 is smaller than P3, and controlling the third electromagnetic valve to be opened if P4 is larger than or equal to P3;
s320, detecting an actual air pressure value P6 at an outlet of the first air compressor by a first pressure transmitter, feeding back a detection result to a controller, receiving the detection value fed back by the first pressure transmitter by the controller, comparing P6 with P1 and P2, if P1 is less than or equal to P6 and less than or equal to P2, keeping the first air compressor to continue to operate, if P6 is less than P1 or P6 is more than P2, respectively controlling the first electromagnetic valve to be closed, the second electromagnetic valve to be opened, stopping the operation of the first air compressor and the operation of the second air compressor by the controller, and then executing step S330;
s330, the second pressure transmitter detects the actual air pressure value P7 at the outlet of the second air compressor and feeds back the detection result to the controller, the controller receives the detection value fed back by the second pressure transmitter and compares P7 with P1 and P2, if P1 is less than or equal to P7 and less than or equal to P2, the second air compressor is kept to continue to operate, if P7 is less than P1 or P7 is more than P2, the controller respectively controls the second electromagnetic valve to be closed, the first electromagnetic valve to be opened, the second air compressor is stopped to operate, and the first air compressor is operated, and then step S320 is executed.
7. The method of controlling a medical compressed air supply apparatus according to claim 6, wherein the step S100 further includes: presetting a first water tank and a second water tank switching interval time T1 in a controller;
the step S320 further includes: controlling the water pump of the first air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once;
the step S330 further includes: controlling the water pump of the second air compressor to run, opening the first water tank inlet electromagnetic valve, opening the first water tank outlet electromagnetic valve, closing the second water tank inlet electromagnetic valve and closing the second water tank outlet electromagnetic valve respectively; after the time T1, the controller respectively controls the opening and closing states of the first water tank inlet electromagnetic valve, the first water tank outlet electromagnetic valve, the second water tank inlet electromagnetic valve and the second water tank outlet electromagnetic valve to switch once.
8. The method of controlling a medical compressed air supply apparatus according to claim 6, wherein the step S310 further includes: the fourth pressure transmitter detects the actual air pressure value P8 at the outlet of the air dryer and feeds the detection result back to the controller, the controller receives the detection value fed back by the fourth pressure transmitter and compares P8 with P4, and if P8 is smaller than P4, the controller controls the alarm to sound.
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| CN108744194A (en) * | 2018-06-12 | 2018-11-06 | 佛山科学技术学院 | A kind of medical ventilator system |
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| CN115050996B (en) * | 2022-05-17 | 2023-10-17 | 致瞻科技(上海)有限公司 | Air supply method and air supply system for fuel cell |
| CN116557776B (en) * | 2023-07-10 | 2023-09-26 | 亿昇(天津)科技有限公司 | Magnetic suspension centrifugal air compressor system and control method |
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