CN212450623U

CN212450623U - Pressure swing adsorption oxygenerator

Info

Publication number: CN212450623U
Application number: CN202021852126.9U
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: 2021-02-02
Anticipated expiration: 2030-08-28

Abstract

A pressure swing adsorption oxygenerator, the upper cover is provided with an air inlet and nitrogen discharge control system, the upper cover is provided with a pressure regulating valve, a nitrogen discharge bin and a high pressure oxygen bin are arranged between a pair of sieve barrels; the air inlet and nitrogen exhaust control system comprises a control circuit, a pair of piston valves, a sealing cover and a pair of electromagnetic valves, wherein the piston valves, the sealing cover and the electromagnetic valves are sequentially arranged from inside to outside in the horizontal direction; the piston is axially movably embedded in the piston groove in a sealing manner. The utility model discloses the integrated level has obtained further improvement, switches technology through the air current that changes the pressure swing adsorption formula oxygenerator simultaneously, is showing and has reduced double tower switching noise.

Description

Pressure swing adsorption oxygenerator

Technical Field

The utility model relates to an oxygen generation technology, a pressure swing adsorption oxygenerator specifically says so.

Background

The pressure swing adsorption oxygen production technology utilizes inexhaustible air as raw material, has low energy consumption, and the acquisition and cost of the raw material are superior to those of chemical oxygen production and electrolytic oxygen production, thus being the most popular oxygen production mode in the treatment and health care use at present.

However, the pressure swing adsorption oxygen generation is under the cooperation of compressed air, the double adsorption towers are switched to operate, and the periodic blasting noise is caused by pressure difference during switching, so that the rest of other people is influenced, and the pressure swing adsorption method is the most obvious problem at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a pressure swing adsorption oxygenerator is provided, change the technology structure of pressure swing adsorption oxygen generation, show and reduce its periodic blasting noise to improve product integration and reduce cost under the prerequisite that improves the oxygen generation quality.

Pressure swing adsorption oxygenerator, including the upper cover that has the suction nozzle, with a pair of sieve bucket of upper cover lower extreme surface sealing connection and with sieve bucket bottom sealing connection's bottom, its characterized in that: an air inlet and nitrogen discharge control system is arranged in the upper cover, a pressure regulating valve is integrally arranged with the upper cover, a nitrogen discharge bin and a high-pressure oxygen bin are integrally arranged between the pair of sieve barrels, and an inlet of the pressure regulating valve is communicated with the high-pressure oxygen bin;

the air inlet and nitrogen exhaust control system comprises a control circuit, a pair of piston valves, a sealing cover and a pair of electromagnetic valves, wherein the piston valves, the sealing cover and the electromagnetic valves are sequentially arranged from inside to outside in the horizontal direction; an air inlet bin which is connected with the air inlet nozzle in a sealing way and a pair of sieve barrel upper cover channels which are communicated with the upper end of the sieve barrel are arranged in the upper cover;

the electromagnetic valve is a two-position three-way electromagnetic valve; the three channel ports are respectively a valve port A, a valve port B and a valve port C, and the two-position state of the electromagnetic valve is that the valve port A is only communicated with the valve port B and the valve port A is only communicated with the valve port C;

the inner side surface of the sealing cover is provided with a pair of piston grooves, the outer sides of the pair of piston grooves are provided with side grooves, the bottom surfaces of the piston grooves and the side grooves are respectively provided with plug groove holes and side groove holes, and the sealing cover is also provided with a thrust hole communicated with the air inlet nozzle through a channel in the sealing cover;

the piston can be axially movably embedded in the piston groove in a sealing manner; and a valve A port, a valve B port and a valve C port of the electromagnetic valve are respectively communicated with the plug groove hole, the side groove hole and the thrust hole in a sealing manner.

The air inlet bin where the pair of piston valves are located is communicated, the upper covers at the positions of the pair of connecting rod cushions of the piston valves are respectively provided with a switching cavity, the piston cavities are respectively arranged in the pair of connecting rod press sleeves, and the sieve barrel upper cover channel, the air inlet bin and the piston cavities on the same side are communicated with each other through the switching cavities; the connecting rod pad is provided with an inner end surface and an outer end surface in the axial direction of the connecting rod and is respectively used for sealing the air inlet bin, the piston cavity and the switching cavity at the inner axial extreme position and the outer axial extreme position of the connecting rod; the spring is in a reset state at the axial extreme position of the inner end of the connecting rod, the spring enables the connecting rod pad to be sealed and separated from the air inlet bin at the moment, and the piston cavity is communicated with the channel of the upper cover 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 piston cavity is sealed and isolated from the switching cavity at the moment, and the air inlet bin is communicated with the channel of the upper cover of the sieve barrel; and a channel which is communicated with the piston cavity and the nitrogen discharging bin is arranged below the piston cavity, and the elastic force of the spring is smaller than the air inlet pressure.

Furthermore, the side groove on each side is arranged outside the piston groove on the same side, a piston groove side wall is arranged between the side groove and the piston groove, and a passing groove communicated with the side groove and the piston groove is formed in the top of the piston groove side wall, so that the side groove is communicated with the piston cavity through the passing groove.

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

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

Furthermore, a pair of oxygen inlets are formed in the oxygen bin base through the sieve barrel bottom cover channels, the pair of oxygen inlets are completely covered with the diaphragms, pressing plates are fixedly arranged on the centers of the diaphragms and close to the diaphragms, two ends of each diaphragm are free ends, the free end of one side corresponding to the oxygen inlet is opened under the pressure of the oxygen inlet output gas on any side below, and the end of the oxygen inlet on the corresponding side is closed when no pressure exists.

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

The utility model discloses oxygenerator integrated level has obtained further improvement, switches technology through the air current that changes the pressure swing adsorption formula oxygenerator simultaneously, is showing and has reduced two towers switching noise.

The utility model discloses the overall structure with the adsorption tower upper cover is optimized, a novel and concrete denitrogenation amortization structure is disclosed, change the compressed gas release in the piston slot into discharging the denitrogenation storehouse from inside passage, reduce the two towers switching noise of pressure swing adsorption system oxygen below 50 decibels by 70 decibels, system oxygen purity simultaneously improves to stable output 95% from 92%, the overall structure as low-power oxygenerator is simplified, integrated as an organic whole with the air-vent valve, the volume has further been reduced, the assembly process flow also consequently obtains simplifying.

Drawings

Figure 1 is an exploded view of the whole structure of the utility model,

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

figure 3 is an enlarged view of section a-a of figure 1,

figure 4 is an enlarged view at D of figure 3,

fig. 5 is an enlarged view of section B-B in fig. 1.

In the figure: 1-an air inlet nozzle, 2-an upper cover, 3-a spring, 4-a connecting rod pad, 5-a connecting rod, 6-a connecting rod pressing sleeve, 7-a piston, 8-a piston ring, 9-a sealing cover, 10-a solenoid valve, 11-a sieve barrel, 12-a sealing pad, 13-a pressing plate, 14-a bottom cover, 15-a diaphragm, 16-a sieve barrel bottom cover channel, 17-a nitrogen discharging bin, 18-a sieve barrel upper cover channel, 19-an air inlet bin, 20-a side groove, 21-a groove, 22-a piston groove, 23-a pressure regulating valve, 24-a high-pressure oxygen bin, 25-a piston valve, 27-a side groove hole, 28-a plug groove hole, 29-a thrust hole, 30-a valve A port, 31-a valve B port, 32-a valve C port, 33-a piston cavity and 34-a switching cavity, 35-sieve barrel base, 36-oxygen bin base, 37-nitrogen bin base and 38-oxygen inlet.

Detailed Description

The invention will be further described with reference to the following figures and examples: the pressure swing adsorption oxygen generator shown in fig. 1 comprises an upper cover 2 with an air inlet nozzle 1, a pair of sieve barrels 11 connected with the lower end face of the upper cover in a sealing way, and a bottom cover 14 connected with the bottom ends of the sieve barrels in a sealing way. The upper cover 2 is internally integrated with an air inlet and nitrogen discharge control system, the upper cover 2 and the upper cover are integrally provided with a pressure regulating valve 23, the sieve barrel 11 is filled with molecular sieve stones, the nitrogen discharge bin 17 and the high-pressure oxygen bin 24 are arranged between the pair of sieve barrels 1 in a side-by-side sealed mode, the inlet of the pressure regulating valve 23 is communicated to the high-pressure oxygen bin 24, and oxygen separated from the sieve barrels enters the high-pressure oxygen bin 24 and then can be output for use through the pressure regulating valve 23. The bottom end of the nitrogen discharging bin 17 is communicated with the atmosphere, the air inlet nozzle 1 is used for being connected with the output end of the air compressor, and other components are sealed.

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

As shown in fig. 1 and 3, the air and nitrogen intake and discharge control system is arranged in the upper cover 2, and if a pair of vertical sieve barrels 11 are arranged transversely, a pair of piston valves 25, a sealing cover 9 and a pair of electromagnetic valves 10 are arranged horizontally and longitudinally from inside to outside.

The piston valve 25 is arranged in the cavity of the upper cover 2, and is sequentially provided with a spring 3, a connecting rod 5 with a connecting rod pad 4, a connecting rod pressing sleeve 6 sleeved on the outer end part of the connecting rod and a piston 7 with a piston ring 8 at the outer end from inside to outside. The inner end of the spring 3 is fixed with the inner wall of the cavity, the outer end of the spring is fixed with the inner end of the connecting rod 5, the spring 3 plays a role of maintaining the contraction of the connecting rod 5 when not controlled by air pressure, the connecting rod 5 contracts to keep a stable state of the piston valve 25, the connecting rod 5 completes the switching of the inner position and the outer position of the piston valve 25 under the action of the spring 3 and the air pressure, and the two positions of each piston valve 25 correspond to the two working states of air inlet and nitrogen exhaust of the sieve barrel.

Referring to fig. 3 and 4, an air inlet bin 19 hermetically connected with the air inlet nozzle 1 and a pair of sieve barrel upper cover channels 18 communicated with the upper end of the sieve barrel 11 are arranged in the upper cover 2. The air inlet bin 19 where the pair of piston valves 25 are located is communicated, the upper cover 2 is respectively provided with a switching cavity 34 at the connecting rod pad 4 of the pair of connecting rods 5, the connecting rod pressing sleeve 6 of the pair of connecting rods 5 is respectively provided with a piston cavity 33, and the sieve barrel upper cover channel 18, the air inlet bin 19 and the piston cavity 33 on the same side are communicated with each other through the switching cavity 34. As can be seen in fig. 3, the switching chamber 34 is located at the intersection of the inlet chamber 19, the piston chamber 33 and the sieve drum cover channel 18. The air inlet bin 19 and the piston cavity 33 at two ends of the switching cavity 34 are respectively provided with a sealing port, the connecting rod pad 4 is provided with a front end face and a rear end face, the connecting rod pad 4 respectively seals the piston cavity 33 and the air inlet bin 19 in the air inlet state and the nitrogen exhaust state of the piston valve 25, the piston cavity 33 and the air inlet bin 19 are respectively isolated from the sieve barrel upper cover channel 18 in the air inlet state and the nitrogen exhaust state of the piston valve 25, and the nitrogen exhaust channel is arranged below the piston cavity 33 in the vertical direction. In fig. 3 and 4, the right screen barrel upper cover channel 18 is in an air inlet state, and compressed air enters the screen barrel upper cover channel 18 from the air inlet bin 19 and then enters the screen barrel from the screen barrel upper cover channel 18; the left side is in a nitrogen discharging state, and the gas rich in nitrogen above the sieve barrel enters the piston valve 25 through the sieve barrel upper cover channel 18 and then enters the nitrogen discharging bin 17 through the piston valve 25.

In the air inlet state, the piston 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 fed, and nitrogen cannot be discharged; in the nitrogen discharging state, the air inlet bin 19 is blocked, and nitrogen above the sieve barrel enters the piston cavity 33 through the sieve barrel upper cover channel 18 and the switching cavity 34, so that the nitrogen is discharged to the atmosphere from the nitrogen discharging bin below the piston cavity 33.

The pair of electromagnetic valves 10 are both two-position three-way electromagnetic valves; the three passage ports of the two-position three-way electromagnetic valve are respectively a valve A port 30, a valve B port 31 and a valve C port 32, the two-position state of the electromagnetic valve is that the valve A port 30 is only communicated with the valve B port 31, and the valve A port 30 is only communicated with the valve C port 32. The pair of electromagnetic valves 10 are respectively installed corresponding to the left piston valve and the right piston valve, the electromagnetic valves 10 are controlled by a control circuit, the control circuit is a simple multivibrator outputting square waves, and a common 555 integrated chip can be built. The multivibrator is respectively connected with the control ends of the pair of electromagnetic valves 10 through the pair of opposite phase output ends, the phases of output signals of the pair of output ends are opposite, 50% duty ratio is output, the period is 1-5 seconds, and the periodic switching of two states of the piston valve is controlled.

As shown in fig. 2 and 3, the cover 9 plays an important role in switching the state and eliminating noise. The inner side surface of the sealing cover 9 is provided with a pair of piston grooves 22, the outer sides of the pair of piston grooves 22 are provided with side grooves 20, the bottom surfaces of the piston grooves 22 and the side grooves 20 are respectively provided with plug groove holes 28 and side groove holes 27 which penetrate through the bottom plate, and the sealing cover 9 is further provided with a thrust hole 29 which is communicated with the air inlet nozzle 1 through a channel in the sealing cover.

The piston 7 is embedded in the piston groove 22 in a sealing manner and can axially move, the outer end part of the piston 7 is provided with a piston ring 8, the piston ring 8 is sealed with the inner side wall of the piston groove 22, and when a plug groove hole 28 at the bottom of the piston groove 22 is blocked by an electromagnetic valve, the piston 7 cannot axially move. The valve A port 30, the valve B port 31 and the valve C port 32 of the electromagnetic valve 10 are respectively communicated with the plug groove hole 28, the side groove hole 27 and the thrust hole 29 in a sealing mode. The thrust hole 29 is communicated with the air inlet nozzle 1 through a channel in the upper cover, the side groove 20 on each side is arranged on the outer side of the piston groove 22 on the same side, a piston groove side wall is arranged between the side groove 20 and the piston groove 22, and the top of the piston groove side wall is provided with a passing groove 21 communicated with the side groove 20 and the piston groove 22, so that the side groove 20 is communicated with the piston cavity 33 through the passing groove 21. Two-position state of the named solenoid valve: the valve a port 30 communicates only with the valve B port 31 in the air bleeding state of the piston groove 22, and the valve a port 30 communicates only with the valve C port 32 in the air bleeding state of the piston groove 22. When the piston groove 22 is inflated in the air state of the piston groove 22, compressed air enters the piston groove 22 through the thrust hole 29, the valve C port 32 and the valve A port 30, so that the connecting rod 5 releases air pressure control and retracts under the action of the spring 3; when air is discharged, referring to fig. 2 and 4, the air sealed in the piston groove 22 passes through the valve A port 30, the valve B port 31, the side groove hole 27, the side groove 20, the passing groove 21 and the piston cavity 33 (the connecting rod pressing sleeve 6 is cylindrical and hollow) -the nitrogen discharging bin 17, the compressed air in the piston groove 22 is discharged from a closed internal channel instead of being directly discharged from the electromagnetic valve, and the air discharging noise is completely shielded. In cooperation with air discharge and air intake of the piston groove, on one hand, two states of the electromagnetic valve determine bidirectional movement or stop of the connecting rod, and on the other hand, the built-in channel reduces noise during nitrogen discharge switching.

The retraction position of the connecting rod 5 enables the spring 3 to be in a recovery state, at the moment, the tension of the spring 3 enables the connecting rod cushion 4 to be isolated from the air inlet bin 19 in a sealing way, the piston cavity 33 is communicated with the upper cover channel 18 of the sieve barrel, and nitrogen in the sieve barrel enters the nitrogen discharge bin 17 through the piston cavity 33; the spring 3 is in a stretching state due to the extending position of the connecting rod 5, the elastic force of the spring 3 is smaller than the air inlet pressure, the piston cavity 33 is sealed and isolated due to the air inlet pressure, and the air inlet bin 19 is communicated with the sieve barrel upper cover channel 18, so that compressed air enters the sieve barrel through the sieve barrel upper cover channel 18 to prepare oxygen. Therefore, the arrangement of the sealing plate plays a key role in the control process by matching with the electromagnetic valve.

As shown in fig. 1, the bottom cover 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 high-pressure oxygen bin 24 and the nitrogen discharging bin 17 in a sealing way through sealing gaskets 12, and the pair of sieve barrel bases 35 are respectively provided with a pair of sieve barrel bottom cover channels 16 communicated with the oxygen bin base 36. The pair of sieve barrel bottom cover channels 16 are provided with a pair of oxygen inlets 38 on an oxygen bin base 36, a diaphragm 15 is completely covered on the pair of oxygen inlets 38, a pressing plate 13 is fixedly arranged on the center of the diaphragm close to the diaphragm 15, so that two ends of the diaphragm are free ends, the free ends of the diaphragm on the corresponding side are opened under the pressure of the gas output by the oxygen inlets 38 on any side below, and one end of the corresponding oxygen inlet is closed when no pressure exists.

By the structure, the dynamic working process of the oxygen machine can be known, and the sieve barrels on the left side and the right side are alternately controlled by the pair of electromagnetic valves 10 driven by the opposite-phase signals to carry out air inlet and nitrogen discharge. The solenoid valve shown in fig. 3 is connected to the left piston groove, and the other solenoid valve shown in fig. 5 is connected to the right piston groove, during the operation of the oxygen generator:

referring to fig. 3 and 4, the left solenoid valve operates in a piston groove gas state, the left connecting rod operates in a nitrogen discharging state, a valve C port 32 of the left solenoid valve is communicated with a thrust hole 29 of the sealing cover 9, when the left piston groove is filled with gas, the valve C port 32 of the left solenoid valve is communicated with a valve a port 30, a solenoid valve gas discharging channel valve B port 31 of the left piston groove is closed, compressed air enters the left piston groove 22 from the thrust hole 29 to balance the pressure at two ends of the left connecting rod 5, the left connecting rod retracts under the action of the restoring force of the spring 3, so that a left piston cavity 33 is opened by a left outer end connecting rod pad 4 and is communicated with a left sieve barrel, the left sieve barrel discharges nitrogen, a left gas inlet bin 19 is sealed by a left inner end connecting rod pad 4, the upper nitrogen-rich gas pressure in the sieve barrel enters a nitrogen discharging bin through a sealing pad and is released from an exhaust port of the atmosphere, see nitrogen discharge path c in fig. 3 and 4. At the beginning of switching the solenoid valve to the air release state, the valve a port 30 communicates with the valve B port 31, the compressed air in the left piston groove 22 is rapidly released, the release noise is shielded in the passage, and the release path is shown as path B in fig. 3 and 4.

While the left-hand solenoid valve is charging the left-hand piston groove 22, as shown in FIG. 5, the right-hand set of symmetrical systems operate in a deflated state with an inverted signal driving the right-hand solenoid valve.

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 the air release state of the piston groove, the piston rod on the right side moves downwards while air is released, and the sieve barrel on the right side enters the air inlet state. At this time, the air inlet channel of the solenoid valve thrust hole 29 of the right piston groove is blocked, referring to the right solenoid valve in fig. 5, the air in the right piston groove enters the right piston cavity 33 from the middle of the right hollow piston ring 8 from the valve a port 30 of the right solenoid valve, passes through the valve B port 31, reaches the right side groove 20, passes through the right side groove 21, and then enters the nitrogen discharging bin 17, the noise generated by the release of the compressed air in the piston cavity 33 is completely sealed in the channel, and the explosion sound generated by the release is greatly reduced. As indicated by the exhaust path b in fig. 5, the exhaust path b in fig. 3 indicates the exhaust passage at the instant the solenoid valve is switched to the air bleeding state. In fig. 3 and 5, due to the inconsistency of the screenshot planes on the spatial curved surface structure, the gas path needs to be referred to as the left side link state in fig. 3. At this time, because the right piston groove is deflated, the air pressure in the piston groove is reduced, the right connecting rod extends outwards under the action of the air pressure of the inner end air inlet bin, the port from the right air inlet bin 19 to the switching cavity 34 is opened, as indicated by an air inlet path a in fig. 3, the air inlet bin 19 is communicated with the right sieve barrel upper cover channel 18, compressed air enters the right sieve barrel 11, a new stream of compressed air enters the right sieve barrel and passes through sieve stones in the sieve barrel to separate oxygen, high-pressure oxygen pushes the right diaphragm 15 at the bottom of the high-pressure oxygen bin 24 from the sieve barrel bottom cover channel 16 of the right sieve barrel to enter the high-pressure oxygen bin 24, and the oxygen 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 switching two states of the electromagnetic valve, the whole operation logic is complete, the structure of the sealing plate plays a key role, the design is ingenious by matching with the control of the three-position two-way electromagnetic valve, the whole integration level is high, the whole structure is further simplified, and the assembly process is simplified; therefore, the use is more convenient, and the oxygen therapy tube can be used after being connected.

Claims

1. The utility model provides a pressure swing adsorption oxygenerator, includes upper cover (2) that have suction nozzle (1), a pair of sieve bucket (11) and bottom (14) with sieve bucket bottom end sealing connection under the upper cover of terminal surface sealing connection, its characterized in that: an air inlet and nitrogen discharge control system is arranged in the upper cover (2), a pressure regulating valve (23) is integrally arranged with the upper cover (2), a nitrogen discharge 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);

the air inlet and nitrogen exhaust control system comprises a control circuit, and a pair of piston valves (25), a sealing cover (9) and a pair of electromagnetic valves (10) which are sequentially arranged from inside to outside in the horizontal direction, wherein the piston valves (25) are arranged in a cavity of the upper cover (2), and are sequentially provided with a spring (3), a connecting rod (5) with a connecting rod pad (4), a connecting rod pressing sleeve (6) sleeved at the outer end part of the connecting rod and a piston (7) with a piston ring (8) at the outer end part from inside to outside; an air inlet bin (19) which is hermetically connected with the air inlet nozzle (1) and a pair of sieve barrel upper cover channels (18) which are communicated with the upper end of the sieve barrel (11) are arranged in the upper cover (2);

the electromagnetic valve (10) is a two-position three-way electromagnetic valve; the three channel ports are respectively a valve A port (30), a valve B port (31) and a valve C port (32), and the two-position state of the electromagnetic valve is that the valve A port (30) is only communicated with the valve B port (31) and the valve A port (30) is only communicated with the valve C port (32);

the inner side surface of the sealing cover (9) is provided with a pair of piston grooves (22), the outer sides of the pair of piston grooves (22) are provided with side grooves (20), the bottom surfaces of the piston grooves (22) and the side grooves (20) are respectively provided with plug groove holes (28) and side groove holes (27), and the sealing cover (9) is also provided with a thrust hole (29) communicated with the air inlet nozzle (1) through a channel in the sealing cover;

the piston (7) is axially movably embedded in the piston groove (22) in a sealing way; and a valve A port (30), a valve B port (31) and a valve C port (32) of the electromagnetic valve (10) are respectively communicated with the plug groove hole (28), the side groove hole (27) and the thrust hole (29) in a sealing manner.

2. The pressure swing adsorption oxygen generator of claim 1, wherein: the air inlet bin (19) where the pair of piston valves (25) are located is communicated, the upper covers (2) at the positions of the pair of connecting rod cushions (4) of the piston valves (25) are respectively provided with a switching cavity (34), the piston cavities (33) are respectively arranged in the pair of connecting rod pressing sleeves (6), and the sieve barrel upper cover channel (18), the air inlet bin (19) and the piston cavities (33) on the same side are communicated with each other through the switching cavities (34); the connecting rod pad (4) is provided with an inner end surface and an outer end surface in the axial direction of the connecting rod and is respectively used for sealing the air inlet bin (19), the piston cavity (33) and the switching cavity (34) at the inner axial extreme position and the outer axial extreme position of the connecting rod (5); the spring (3) is in a reset state at the axial extreme position of the inner end of the connecting rod (5), the spring (3) enables the connecting rod pad (4) to be sealed and isolated from the air inlet bin (19), and the piston 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 piston 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); a channel which is used for communicating the piston cavity (33) with the nitrogen discharging bin (17) is arranged below the piston cavity (33), and the elastic force of the spring (3) is smaller than the air inlet pressure.

3. The pressure swing adsorption oxygen generator of claim 2, wherein: the side groove (20) on each side is arranged on the outer side of the piston groove (22) on the same side, a piston groove side wall is arranged between the side groove (20) and the piston groove (22), and a passing groove (21) communicated with the side groove (20) and the piston groove (22) is arranged at the top of the piston groove side wall, so that the side groove (20) is communicated with the piston cavity (33) through the passing groove (21).

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

5. The pressure swing adsorption oxygen generator of claim 1, wherein: the bottom cover (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 in sealing connection with the pair of sieve barrels (11), the high-pressure oxygen bin (24) and the nitrogen discharging bin (17), and the pair of sieve barrel bases (35) are respectively provided with a pair of sieve barrel bottom cover channels (16) communicated with the oxygen bin base (36).

6. The pressure swing adsorption oxygen generator of claim 5, wherein: the pair of sieve barrel bottom cover channels (16) are provided with a pair of oxygen inlets (38) on an oxygen bin base (36), a diaphragm (15) is completely covered on the pair of oxygen inlets (38), a pressing plate (13) is fixedly arranged on the center of the diaphragm and close to the diaphragm (15), two ends of the diaphragm are free ends, the free end on one side corresponding to the oxygen inlet is opened under the pressure of the output gas of the oxygen inlet (38) on any side below, and the end of the oxygen inlet on the corresponding side is closed when no pressure exists.

7. The pressure swing adsorption oxygen generator of claim 1, wherein: the nitrogen discharging bin (17) is provided with a nitrogen discharging port communicated with the atmosphere, and a silencing filler is arranged on the inner side of the nitrogen discharging port.