CN114105100B

CN114105100B - Long-life pressure swing adsorption oxygenerator

Info

Publication number: CN114105100B
Application number: CN202010884114.2A
Authority: CN
Inventors: 代家慧
Original assignee: Wuhan Meiyang Technology Co ltd
Current assignee: Wuhan Meiyang Technology Co ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2023-10-13
Anticipated expiration: 2040-08-28
Also published as: CN114105100A

Abstract

The long-life pressure swing adsorption oxygenerator is characterized in that an air inlet and nitrogen discharge control system is arranged in an upper cover, a pressure regulating valve is integrally arranged with the upper cover, and a nitrogen discharge bin and a high-pressure oxygen bin are integrally arranged between a pair of sieve barrels; the air inlet nitrogen discharge control system comprises a control circuit, a pair of switching valves, a sealing cover and a pair of electromagnetic valves, wherein the switching valves, the sealing cover and the electromagnetic valves are sequentially arranged from inside to outside in the horizontal direction, a pair of variable volume grooves are formed in the inner side surface of the sealing cover, discharge grooves are respectively formed in the outer sides of the pair of variable volume grooves, discharge groove holes and variable volume groove holes which are communicated with the electromagnetic valves are respectively formed in bottom plates of the variable volume grooves and the discharge grooves, and a thrust hole which is communicated with an air inlet nozzle through a channel in the sealing cover is further formed in the sealing cover; the piston is omitted, and the connecting rod can be axially moved only by means of the pressure change of the isolation pad sealing the variable-volume groove and the variable-volume groove. The invention not only further improves the integration level, but also greatly prolongs the service life due to the omission of the piston, and remarkably reduces the double-tower switching noise by changing the air flow switching process of the pressure swing adsorption type oxygen generating equipment.

Description

Long-life pressure swing adsorption oxygenerator

Technical Field

The invention relates to an oxygen generation technology, in particular to a long-life pressure swing adsorption oxygen generator.

Background

The pressure swing adsorption oxygen production technology utilizes the raw materials which are inexhaustible air, has low energy consumption, has better raw material acquisition, safety and cost than chemical oxygen production and electrolytic oxygen production, and is the most popular oxygen production mode in the current oxygen treatment and health care use.

However, the conventional pressure swing adsorption oxygen production utilizes a switching valve, the switching valve is continuously and frequently moved in the working process, and the piston of the switching valve is continuously rubbed with a wall, so that the temperature is increased, partial noise is generated, and the piston is the most vulnerable component. Therefore, the service life of the piston almost determines the service life of the oxygenerator, and particularly, the piston is easy to damage when used in a machine with high frequency, and in the prior art, the piston is a part which is difficult to avoid in the oxygenerator with high flow rate.

Disclosure of Invention

The invention aims to solve the technical problems of providing a long-life pressure swing adsorption oxygen generator, changing the process structure of pressure swing adsorption oxygen generation, replacing a piston process with a valve structure without complicating, obviously prolonging the service life of the oxygen generator, reducing the periodic explosion noise, improving the product integration level and reducing the cost on the premise of improving the oxygen generation quality.

The long-life pressure swing adsorption oxygenerator comprises an upper cover with an air inlet nozzle, a pair of sieve barrels which are in sealing connection with the lower end face of the upper cover, and a base which is in sealing connection with the bottom end of the sieve barrels, wherein an air inlet and nitrogen discharge control system is arranged in the upper cover and comprises a control circuit, a distribution air passage and a switching valve, the distribution air passage is provided with a nitrogen discharge port, an air inlet bin which is in sealing connection with the air inlet nozzle, and a pair of sieve barrel upper cover channels which are communicated with the upper ends of the sieve barrels, and the air inlet bin is respectively communicated with the sieve barrel upper cover channels and the nitrogen discharge port under the action of the control circuit through the switching valve; the method is characterized in that:

a pressure regulating valve is integrally arranged with the upper cover, a nitrogen discharging bin and a hyperbaric oxygen bin are integrally arranged between the pair of sieve barrels, and an inlet of the pressure regulating valve is communicated with the hyperbaric oxygen bin;

the upper cover is internally and horizontally provided with a pair of switching valves, a sealing cover and a pair of electromagnetic valves from inside to outside in sequence, the switching valves are arranged in a cavity of the upper cover, and are internally and externally provided with a connecting rod pad, a spring sleeved at the inner end part of the connecting rod, a connecting rod pressing sleeve, a valve frame, a supporting head and a separation pad, wherein the connecting rod pressing sleeve is arranged in the middle of the connecting rod in a surrounding manner and is fixed with the upper cover;

the inner side surface of the sealing cover is symmetrically provided with a pair of variable-volume grooves, the opening of the variable-volume grooves is covered with a movable pad capable of elastic stretching in a sealing way, the edge of the movable pad is pressed on the outer end surface of the variable-volume grooves in a sealing way by the valve frame, the outer sides of the pair of variable-volume grooves are respectively provided with a discharge groove, the bottom surfaces of the variable-volume grooves and the discharge grooves are respectively provided with a variable-volume groove hole and a discharge groove hole, and the sealing cover is also provided with a thrust hole communicated with the air inlet bin through a channel in the sealing cover; the nitrogen discharge ports are provided with a pair, and each discharge groove is respectively communicated with the nitrogen discharge ports on the same side in a sealing way through an independent air discharge channel in the upper cover;

the electromagnetic valve is a two-position three-way electromagnetic valve; the three passage ports are a valve A port, a valve B port and a valve C port respectively, the two-position state of the electromagnetic valve is that the valve A port is communicated with the valve B port only, and the valve A port is communicated with the valve C port only; the valve A port is communicated with the variable-volume slotted hole in a sealing way, and the valve B port is communicated with the discharge slotted hole in a sealing way;

the isolation pad is in an elastically stretchable annular shape, the edge of the inner ring is sealed and fixed by the front part of the valve rod, the edge of the outer ring is sealed and pressed between the connecting rod pressing sleeve and the valve frame, the connecting rod pressing sleeve and the isolation pad enclose an exhaust cavity with an inner end opening, and the nitrogen exhaust port is communicated with the nitrogen exhaust bin and is arranged at the lower side of the exhaust cavity; the air inlet bin is arranged on the inner side of the valve rod, a switching cavity communicated with the upper cover channel of the sieve barrel is arranged at the connecting rod pad, and the connecting rod pad is used for blocking the air inlet bin or the air outlet bin.

The axial extreme position of the inner end of the connecting rod enables the spring to be in a recovery state, at the moment, the connecting rod pad is sealed and isolated from the air inlet bin by the spring, and the air exhaust cavity is communicated with the upper cover channel of the sieve barrel; the connecting rod is positioned at the axial extreme position of the outer end under the action of air inlet pressure, the spring is in a stretching state, the exhaust cavity is sealed and isolated from the switching cavity, and the air inlet bin is communicated with the upper cover channel of the sieve barrel; the elastic force of the spring is smaller than the air inlet pressure.

As an embodiment, the control circuit is a multivibrator for outputting square waves, the multivibrator is connected with control ends of the pair of electromagnetic valves through a pair of opposite-phase output ends, phases of output signals of the pair of opposite-phase output ends are opposite, and 50% duty ratio and period are 1-5 seconds.

Further, the base is provided with a pair of sieve barrel base, an oxygen bin base and a nitrogen bin base which are respectively in sealing connection with a pair of sieve barrels, a high-pressure oxygen bin and a nitrogen discharging bin, and the pair of sieve barrel base is respectively provided with a pair of sieve barrel base channels communicated with the oxygen bin base.

The sieve barrel base channel is provided with a pair of oxygen bin inlets on the oxygen bin base, a membrane is completely covered on the pair of oxygen bin inlets, a pressing plate is fixedly arranged in the center of the membrane and is close to the membrane, two ends of the membrane are free ends, one side free end corresponding to the oxygen bin inlet under the pressure of the output gas of the oxygen bin inlet under Ren Yice is opened, and one end corresponding to the oxygen bin inlet on one side is closed when no pressure exists.

As an embodiment, the bottom of the nitrogen discharging bin is provided with a nitrogen discharging port communicated with the atmosphere, and the inner side of the nitrogen discharging port is provided with a silencing filler.

The integration level of the oxygenerator is further improved, and meanwhile, the double-tower switching noise is remarkably reduced by changing the air flow switching process of the pressure swing adsorption type oxygenerator.

The invention optimizes the integral structure of the upper cover of the adsorption tower, discloses a novel and specific switching valve and nitrogen-discharging silencing structure, cancels a frequently rubbed piston structure, avoids the obvious heating of moving parts and the rapid aging problem caused by the heat, and replaces the moving parts with an elastic membrane structure to realize the volume change and the valve rod movement pushed by the volume change. Meanwhile, the compressed gas in the variable-volume tank is released and is discharged from the internal channel to the nitrogen discharging bin, the switching noise of the double towers for pressure swing adsorption oxygen production is reduced from 70 decibels to below 50 decibels, meanwhile, the oxygen production purity is improved from 92% to stable output 95%, the whole structure of the low-power oxygen generator is simplified, the pressure regulating valve is integrated into a whole, the volume is further reduced, and the assembly process flow is simplified.

Drawings

Figure 1 is an exploded view of the overall structure of the present invention,

figure 2 is an enlarged view of the internal structural view of the closure,

figure 3 is an enlarged view of a horizontal section of the upper cover through the axis of the connecting rod,

figure 4 is an enlarged view of a portion of the control structure of figure 3,

figure 5 is an enlarged view at a in figure 3,

figure 6 is a cross-sectional view of D-D in figure 3,

figure 7 is a cross-sectional view of figure 3 at E-E,

fig. 8 is a sectional view of the section I-I of fig. 7.

In the figure: 1-air inlet nozzle, 2-upper cover, 3-spring, 4-connecting rod pad, 5-connecting rod, 6-connecting rod pressing sleeve, 7-valve frame, 8-movable pad, 9-sealing cover, 10-electromagnetic valve, 11-screening barrel, 12-sealing pad, 13-pressing plate, 14-base, 15-diaphragm, 16-screening barrel base channel, 17-nitrogen discharging bin, 18-screening barrel upper cover channel, 19-air inlet bin, 20-discharge tank, 21-isolation pad, 22-variable capacity tank, 23-pressure regulating valve, 24-high pressure oxygen bin, 25-switching valve, 26-nitrogen discharging port, 27-discharge slot, 28-variable capacity slot, 29-thrust hole, 30-valve A port, 31-valve B port, 32-valve C port, 33-discharge cavity, 34-switching cavity, 35-screening barrel base, 36-oxygen bin base, 37-nitrogen bin base, 38-oxygen bin inlet, 39-supporting head, 40-screw, 41-supporting bowl and 42-air discharging channel.

Detailed Description

The invention is further illustrated by the following examples in conjunction with the accompanying drawings: the long-life pressure swing adsorption oxygenerator as shown in fig. 1 comprises an upper cover 2 with an air inlet nozzle 1, a pair of sieve barrels 11 in sealing connection with the lower end face of the upper cover, and a base 14 in sealing connection with the bottom ends of the sieve barrels, wherein a nitrogen discharging bin 17 and a high-pressure oxygen bin 24 are integrally arranged between the pair of sieve barrels 11, a pressure regulating valve 23 is integrally arranged with the upper cover 2, and the inlet of the pressure regulating valve 23 is communicated with the high-pressure oxygen bin 24; in the whole structure, only the micro air compressor and the oxygen output pipe are externally connected, the oxygen manufacturing process is that the micro air compressor supplies air to the upper cover 2, the upper cover controls air intake and exhaust, the air intake is sent to the sieve barrel 11, molecular sieve stones are filled in the sieve barrel, the special molecular sieve stones can effectively suck oxygen molecules with diameters smaller than the diameters of the molecular sieve stones into holes, nitrogen and other compound gas molecules with diameters larger than the diameters of the molecular sieve stones are blocked outside the holes, so that molecules with different sizes are separated, the oxygen is distributed at the lower part of the sieve barrel 11 after being separated, and gases such as nitrogen, carbon dioxide and the like are distributed at the upper part of the sieve barrel, so that the output gases are also divided into two paths. Oxygen enters a hyperbaric oxygen bin 24 from the lower end of the sieve barrel, and the hyperbaric oxygen bin 24 also plays a role in equalizing and buffering and then is output through a pressure reducing valve 23 and an oxygen delivery pipe; other gases still reversely enter the nitrogen discharging bin 17 through the original air inlet channel at the upper part of the screen barrel, and are discharged to the atmosphere after being subjected to noise reduction. The separated discharged nitrogen needs to be discharged firstly and then enters new air to ensure the oxygen content of the raw material gas, and simultaneously ensures the continuity of air supply, so that double sieve barrels are arranged for alternately preparing oxygen and discharging nitrogen to ensure that the oxygen preparation is uninterrupted. The inlet channel is shared by the inlet and the nitrogen discharge channels of the sieve barrel, namely the channel 18 on the sieve barrel, so that the switching of the sieve barrels and the inlet and the discharge of two paths of gases are coordinated and orderly by the inlet nitrogen discharge control system. The frequent abrupt air release of compressed gas can cause periodic noise, and when the oxygen flow is large, the main air channel is directly switched without using the electromagnetic valve, and the large electromagnetic valve has large noise and high cost, so that the miniature electromagnetic valve is generally adopted as pilot control at present to guide the rubber valve rod to switch the air flow. The rubber valve rod in the prior art uses a piston, and the piston rod is pushed to move by being matched with the gas release of the closed space of the piston cylinder, so that the piston cylinder heats and the piston is aged at a high speed in continuous reciprocating motion due to high movement frequency of the piston, and the piston becomes a vulnerable part of the oxygen generator. The inventors have found that the key to the valve body is the opening and closing of the gas path, and that a piston is not necessary. The repeated friction of the piston is avoided, so that the damage rate of the valve body can be greatly reduced, and the service life of the oxygenerator is remarkably prolonged.

The construction of a specific intake and exhaust control system structure in combination with the novel valve body of the present invention is described in detail below with reference to the drawings and examples.

The air inlet and nitrogen discharge control system is arranged in the upper cover 2 and comprises a control circuit, a distribution air passage, a switching valve 25 and an electromagnetic valve, wherein the distribution air passage is provided with an air inlet passage and a nitrogen discharge passage, and the air inlet passage and the nitrogen discharge passage are controlled by the switching valve 25. The air inlet channel comprises an air inlet bin 19 and a pair of sieve barrel upper cover channels 18 communicated with the upper end of the sieve barrel 11, and the nitrogen discharge channel comprises the sieve barrel upper cover channels 18 and a nitrogen discharge port 26.

As shown in fig. 3, a pair of switching valves 25, a sealing cover 9 and a pair of electromagnetic valves 10 are sequentially arranged in the upper cover 2 from inside to outside in the horizontal direction, the switching valves 25 are arranged in a cavity of the upper cover 2, and a connecting rod 5, a spring 3 sleeved at the inner end part of the connecting rod 5, a connecting rod pad 4, a connecting rod pressing sleeve 6 surrounding the middle part of the connecting rod 5 and fixed with the upper cover, a valve frame 7, a supporting head 39 fixedly arranged at the outer end part of the connecting rod and an isolation pad 21 are sequentially arranged from inside to outside.

The inner end of the connecting rod 5 is positioned in the air inlet bin 19, the air inlet bins 19 where a pair of connecting rods are positioned are integrated or communicated with each other, the middle part of the connecting rod 5 is positioned in an exhaust cavity 33 surrounded by the connecting rod pressing sleeve 6, the outer end of the exhaust cavity 33 is provided with a separation pad 21 which is in sealing connection with the connecting rod and the connecting rod pressing sleeve 6, the separation pad 21 has deformable elasticity, when the connecting rod moves, the separation of the exhaust cavity 33 and the air chamber at the outer end of the connecting rod is still kept, a nitrogen discharge port 26 is arranged at the lower side of the exhaust cavity 33, the exhaust cavity 33 is always communicated with the nitrogen discharge port 26, and the nitrogen discharge port 26 is provided with a pair of independent exhaust cavities 33, so that the independence of the pair of exhaust cavities 33 is kept. The chamber where the connecting rod pad 4 is positioned is a switching chamber 34, and the switching chamber 34 is always communicated with the sieve barrel upper cover channel 18 and is communicated with or isolated from the air inlet bin 19 and the air outlet chamber 33 through the connecting rod pad 4 at the front end and the rear end respectively. Thus, the outward movement of the connecting rod 5 controls the intake of the upper sieve bowl passage 18 from the intake chamber 19, and the inward movement of the connecting rod 5 controls the discharge of the upper sieve bowl passage 18 to the discharge chamber 33 to the nitrogen discharge port 26. The isolation pad 21 is in an elastically stretchable annular shape, the edge of the inner ring is sealed and fixed by the front part of the valve rod, the edge of the outer ring is sealed and pressed between the connecting rod pressing sleeve 6 and the valve frame 7, and the connecting rod pressing sleeve 6 and the isolation pad 21 enclose an exhaust cavity 33 with an inner end opening. In fig. 3 and 4, the right upper cover channel 18 of the sieve barrel is in an air inlet state, compressed air enters the upper cover channel 18 of the sieve barrel from the air inlet bin 19, and then enters the sieve barrel from the upper cover channel 18 of the sieve barrel; the left side is in a nitrogen discharge state, and the gas rich in nitrogen above the sieve barrel enters the switching valve 25 through the sieve barrel upper cover channel 18 and then enters the nitrogen discharge bin 17 through the switching valve 25.

In the air inlet state, the air outlet cavity 33 is blocked, and compressed air entering from the air inlet bin 19 enters the sieve barrel 11 through the switching cavity 34 and the sieve barrel upper cover channel 18, so that only air can be inlet and nitrogen cannot be discharged; in the nitrogen discharge state, the air inlet bin 19 is blocked, and nitrogen above the screening barrel enters the air discharge cavity 33 through the screening barrel upper cover channel 18 and the switching cavity 34, so that the nitrogen is discharged to the atmosphere from the nitrogen discharge bin below the air discharge cavity 33.

As shown in fig. 3, 4, 5, the cover 9 plays an important role in switching the state and eliminating noise. The inner side surface of the sealing cover 9 is symmetrically provided with a pair of variable-volume grooves 22, the opening of the variable-volume groove 22 is covered with a flexible stretching movable pad 8 in a sealing way, and the edge of the movable pad 8 is pressed on the outer end surface of the variable-volume groove in a sealing way by the valve frame 7. As shown in fig. 2, a relief groove 20 is provided on the outer side of each of the pair of varactors 22, and a varactor groove hole 28 and a relief groove hole 27 are provided on the bottom surfaces of each of the varactors 22 and the relief groove 20. As shown in fig. 3, the cover 9 is further provided with a thrust hole 29 communicating with the air intake compartment 19 through a passage in the cover, and a connection passage of the thrust hole 29 is seen in fig. 6. Each bleed slot 20 is in sealing communication with the same side of the nitrogen vent 26 through a separate bleed passage 42 in the upper cover 2, the bleed passages 42 being seen in fig. 7 and 8.

As shown in fig. 3 and 4, the pair of solenoid valves 10 are two-position three-way solenoid valves; the three passage ports are respectively a valve A port 30, a valve B port 31 and a valve C port 32, and the two-position states of the electromagnetic valve are respectively controlled by a control circuit, wherein the valve A port 30 is communicated with the valve B port 31 only, and the valve A port 30 is communicated with the valve C port 32 only. The external links are: valve a port 30 is in sealed communication with the variable volume orifice 28 and valve B port 31 is in sealed communication with the relief orifice 27. The control circuit is a multivibrator for outputting square waves, the multivibrator is respectively connected with the control ends of the pair of electromagnetic valves 10 through a pair of opposite phase output ends, the phases of output signals of the pair of opposite phase output ends are opposite, and the output duty ratio is 50% and the period is 1-5 seconds.

The axial extreme position of the inner end of the connecting rod 5 enables the spring 3 to be in a recovery state, at the moment, the spring 3 enables the connecting rod pad 4 to seal and isolate the air inlet bin 19, and the air exhaust cavity 33 is communicated with the sieve barrel upper cover channel 18; under the action of air inlet pressure, the connecting rod 5 is positioned at the axial extreme position of the outer end, the spring 3 is in a stretching state, the exhaust cavity 33 is sealed and isolated from the switching cavity 34, and the air inlet bin 19 is communicated with the sieve barrel upper cover channel 18; the elastic force of the spring 3 is set smaller than the intake pressure.

As shown in fig. 1, the base 14 is provided with a pair of sieve barrel bases 35, an oxygen bin base 36 and a nitrogen bin base 37 which are respectively connected with the pair of sieve barrels 11, the hyperbaric oxygen bin 24 and the nitrogen discharge bin 17 in a sealing manner, and the pair of sieve barrel bases 35 are respectively provided with a pair of sieve barrel base channels 16 communicated with the oxygen bin base 36.

The sieve barrel base channels 16 are respectively provided with a pair of oxygen bin inlets 38 communicated with the high-pressure oxygen bin 24 at the oxygen bin base 36, the pair of oxygen bin inlets 38 are completely covered with a membrane 15, the middle of the membrane is fixedly provided with a pressing plate 13 which is closely adjacent to the membrane 15, two ends of the membrane are free ends, one side free ends corresponding to the oxygen bin inlets under the pressure of the output gas of the oxygen bin inlets 38 at the lower side Ren Yice are opened, oxygen enters the high-pressure oxygen bin 24 from the sieve barrel at the corresponding side, and one end of the oxygen bin inlet at the corresponding side is closed when no pressure exists. The bottom of the nitrogen discharging bin 17 is provided with a nitrogen discharging port communicated with the atmosphere, and the inner side of the nitrogen discharging port can be provided with silencing cotton.

As can be seen from FIG. 1, the whole control system is almost integrated in the upper cover of the adsorption tower, the original complex double-valve-rod control element is also transversely arranged in the upper cover of the adsorption tower after being integrated and simplified, and the extra space is enough for arranging a pressure regulating valve, so that the adsorption tower can be operated only by externally connecting a miniature air compressor during use, and the adsorption tower is more convenient to use.

With the above structure, it is possible to know the dynamic operation process of the oxygen machine, and the screen barrels on the left and right sides are alternately controlled by a pair of solenoid valves 10 driven by the reverse phase signals to perform air intake and nitrogen discharge. The solenoid valve shown in fig. 3, 4, 5 is connected to the left side varactor, during operation of the oxygenerator:

referring to fig. 3, 4 and 5, the left solenoid valve is operated in the air state of the variable capacitance tank, the left connecting rod is operated in the nitrogen discharge state, the valve C opening 32 of the left solenoid valve is communicated with the thrust hole 29 of the sealing cover 9, when the left variable capacitance tank is in air intake, the valve C opening 32 of the left solenoid valve is communicated with the valve a opening 30, the valve B opening 31 of the left solenoid valve air discharge channel of the left variable capacitance tank is closed, compressed air enters the left variable capacitance tank 22 from the thrust hole 29, the pressure of two ends of the left connecting rod 5 is balanced, the left connecting rod is retracted under the restoring force of the spring 3, the left connecting rod pad 4 at the outer end opens the left air discharge cavity 33, the air discharge cavity 33 is communicated with the left sieve barrel, the left sieve barrel is in nitrogen discharge, the connecting rod pad 4 at the inner end seals the left air inlet bin 19, the upper layer nitrogen-rich gas pressure in the sieve barrel enters the nitrogen discharge bin and is released with the air discharge outlet through the bottom of the nitrogen discharge bin, and the nitrogen discharge path C in fig. 3 and 4 is referred to. In the initial stage of switching the solenoid valve to the bleed state of the variable-volume tank 22, the valve A port 30 is communicated with the valve B port 31, the compressed gas in the left variable-volume tank 22 is released quickly through the bleed passage 42, the release noise is shielded in the passage, and the external noise is remarkably reduced because the nitrogen is discharged outside the solenoid valve without directly passing through the solenoid valve. The release path is as path b in fig. 3, 4.

The left solenoid valve is operated in the de-aerated state with the reverse signal driving the right solenoid valve by a symmetrical set of systems on the right while the left varactor 22 is in-aerated.

The valve A port 30 of the right electromagnetic valve is only communicated with the valve B port 31, the right electromagnetic valve works in a deflation state of the variable volume tank, and due to the fact that the relative pressure of compressed gas is high, the right piston rod is pushed by air pressure to move down rapidly when deflating, the connecting rod pad at the outer end seals the exhaust cavity 33, the right air inlet channel is opened, and the right screening barrel enters an air inlet state. At this time, the solenoid valve thrust hole 29 of the right side variable capacity tank is blocked in the intake passage, see the left side solenoid valve of fig. 4. The gas in the right side variable capacitance groove passes through the valve A opening 30 of the right side electromagnetic valve, the valve B opening 31, the right side discharge groove 20, the right side discharge channel 42, the nitrogen discharging bin 17, the noise generated by the release of the compressed gas in the air discharging cavity 33 is completely enclosed in the channel, and the blasting noise generated by the discharge is greatly reduced. Referring to fig. 4, an exhaust path b is indicated, which indicates the exhaust passage at the instant when the solenoid valve is switched to the air release state. At this time, as the right side variable volume tank is deflated, the air pressure in the variable volume tank is reduced, the right side connecting rod is rapidly extended and seals the right side exhaust cavity 33 under the air pressure action of the air inlet bin at the inner end, the air inlet bin 19 at the right side is opened to the port of the switching cavity 34, as indicated by the air inlet path a in fig. 4, the air inlet bin 19 is communicated with the screen bucket upper cover channel 18 at the right side, compressed air enters the right side screen bucket 11, a new stream of compressed air enters the screen bucket at the right side and passes through the screen stones in the screen bucket to separate out oxygen, the right side membrane 15 at the bottom of the high-pressure oxygen bin 24 is propped open by the screen bucket base channel 16 of the right side screen bucket, the oxygen gas flow in use enters the high-pressure oxygen bin 24, and the oxygen gas flow in use is output through the pressure reducing valve 23 above the high-pressure oxygen bin.

The whole control movement is completed only by means of switching of two states of the electromagnetic valve, the whole operation logic is complete, the sealing plate structure plays a key role, the interior of the variable-volume groove is sealed or communicated only by the action of the electromagnetic valve, the connecting rod can axially move without friction of a piston, the temperature rise and aging of rubber are obviously reduced, and the service life of rubber parts is obviously prolonged. The control design is ingenious, the overall integration level is high, the overall composition is further simplified, and the assembly process is simplified; therefore, the use is more convenient, and the oxygen therapy tube can be connected for use.

Claims

1. The utility model provides a long-life pressure swing adsorption oxygenerator, includes upper cover (2) with air inlet nozzle (1), with upper cover lower terminal surface sealing connection's a pair of sieve barrel (11), and with sieve barrel bottom sealing connection's base (14), be equipped with in upper cover (2) and intake and arrange nitrogen control system, intake and arrange nitrogen control system and include control circuit, distribution air flue and diverter valve (25), distribution air flue is equipped with nitrogen outlet (26), with air inlet bin (19) of air inlet nozzle (1) sealing connection, and a pair of sieve barrel upper cover passageway (18) with sieve barrel (11) upper end intercommunication, air inlet bin (19) are respectively with sieve barrel upper cover passageway (18) and nitrogen outlet (26) intercommunication under control circuit effect through diverter valve (25); the method is characterized in that:

a pressure regulating valve (23) is integrally arranged with the upper cover (2), a nitrogen discharging bin (17) and a high-pressure oxygen bin (24) are integrally arranged between the pair of sieve barrels (11), and an inlet of the pressure regulating valve (23) is communicated with the high-pressure oxygen bin (24);

a pair of switching valves (25), a sealing cover (9) and a pair of electromagnetic valves (10) are sequentially arranged in the upper cover (2) in the horizontal direction from inside to outside, the switching valves (25) are arranged in a cavity of the upper cover (2), a connecting rod (5) with a connecting rod pad (4), a spring (3) sleeved at the inner end part of the connecting rod (5), a connecting rod pressing sleeve (6) which is arranged in the middle part of the connecting rod (5) in a surrounding manner and is fixed with the upper cover, a valve frame (7), a supporting head (39) and a separation pad (21) are sequentially arranged at the outer end part of the connecting rod from inside to outside;

the inner side surfaces of the sealing cover (9) are symmetrically provided with a pair of variable-volume grooves (22), an opening of the variable-volume grooves (22) is hermetically covered with an elastically stretchable movable pad (8), the edge of the movable pad (8) is hermetically pressed on the outer end surfaces of the variable-volume grooves by the valve frame (7), the outer sides of the pair of variable-volume grooves (22) are respectively provided with a discharge groove (20), the bottom surfaces of the variable-volume grooves (22) and the discharge grooves (20) are respectively provided with a variable-volume groove hole (28) and a discharge groove hole (27), and the sealing cover (9) is also provided with a thrust hole (29) communicated with the air inlet bin (19) through a channel in the sealing cover; the nitrogen discharge ports (26) are provided with a pair, and each discharge groove (20) is respectively communicated with the nitrogen discharge ports (26) on the same side in a sealing way through an independent air discharge channel (42) in the upper cover (2);

the electromagnetic valve (10) is a two-position three-way electromagnetic valve; the three passage ports are a valve A port (30), a valve B port (31) and a valve C port (32) respectively, and the two states of the electromagnetic valve are that the valve A port (30) is communicated with the valve B port (31) only and the valve A port (30) is communicated with the valve C port (32) only; the valve A port (30) is communicated with the variable-volume slotted hole (28) in a sealing way, and the valve B port (31) is communicated with the relief slotted hole (27) in a sealing way;

the isolation pad (21) is in an elastically stretchable annular shape, the edge of the inner ring is sealed and fixed by the front part of the valve rod, the edge of the outer ring is sealed and pressed between the connecting rod pressing sleeve (6) and the valve frame (7), the connecting rod pressing sleeve (6) and the isolation pad (21) enclose an exhaust cavity (33) with an inner end opening, and the nitrogen discharge port (26) is communicated with the nitrogen discharge bin and is arranged at the lower side of the exhaust cavity (33); the air inlet bin (19) is arranged on the inner side of the valve rod, a switching cavity (34) communicated with the sieve barrel upper cover channel (18) is arranged at the connecting rod pad (4), and the connecting rod pad (4) is used for blocking the air inlet bin (19) or the air outlet cavity (33).

2. The long life pressure swing adsorption oxygenerator of claim 1 wherein: the axial extreme position of the inner end of the connecting rod (5) enables the spring (3) to be in a recovery state, at the moment, the spring (3) enables the connecting rod pad (4) to seal and isolate the air inlet bin (19), and the air outlet cavity (33) is communicated with the sieve barrel upper cover channel (18); the connecting rod (5) is positioned at the axial extreme position of the outer end under the action of air inlet pressure, the spring (3) is in a stretching state, the exhaust cavity (33) is sealed and isolated from the switching cavity (34), and the air inlet bin (19) is communicated with the sieve barrel upper cover channel (18); the elastic force of the spring (3) is smaller than the air inlet pressure.

3. The long life pressure swing adsorption oxygenerator of claim 1 wherein: the control circuit is a multivibrator for outputting square waves, the multivibrator is respectively connected with the control ends of a pair of electromagnetic valves (10) through a pair of opposite phase output ends, the phases of output signals of the pair of opposite phase output ends are opposite, and the output duty ratio is 50%, and the period is 1-5 seconds.

4. The long life pressure swing adsorption oxygenerator of claim 1 wherein: the base (14) is provided with a pair of sieve barrel bases (35), an oxygen bin base (36) and a nitrogen bin base (37) which are respectively and hermetically connected with the pair of sieve barrels (11), the high-pressure oxygen bin (24) and the nitrogen discharge bin (17), and the pair of sieve barrel bases (35) are respectively provided with a pair of sieve barrel base channels (16) communicated with the oxygen bin base (36).

5. The long life pressure swing adsorption oxygenerator of claim 4 wherein: the pair of sieve barrel base channels (16) are provided with a pair of oxygen bin inlets (38) on the oxygen bin base (36), the pair of oxygen bin inlets (38) are completely covered with a membrane (15), the membrane (15) is closely adjacent, and a pressing plate (13) is fixedly arranged in the center of the membrane, so that two ends of the membrane are free ends, one side free end corresponding to the oxygen bin inlets under the pressure of the output gas of the oxygen bin inlets (38) below Ren Yice is opened, and one side oxygen bin inlet end corresponding to one side is closed when no pressure exists.

6. The long life pressure swing adsorption oxygenerator of claim 1 wherein: the bottom of the nitrogen discharging bin (17) is provided with a nitrogen discharging port communicated with the atmosphere, and the inner side of the nitrogen discharging port is provided with a silencing filler.