CN212450622U

CN212450622U - Long-life pressure swing adsorption oxygenerator

Info

Publication number: CN212450622U
Application number: CN202021849575.8U
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 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 and nitrogen exhaust 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; the piston is omitted and the connecting rod can be axially moved only by means of the pressure change of the isolating pad for sealing the variable-volume groove and the variable-volume groove. The utility model discloses not only the integrated level has obtained further improvement, owing to left out the piston simultaneously, has greatly prolonged life, switches technology through the air current that changes pressure swing adsorption formula oxygenerator, is showing and has reduced two towers switching noise.

Description

Long-life pressure swing adsorption oxygenerator

Technical Field

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

Background

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

However, in the conventional pressure swing adsorption oxygen generation, the switching valve is used, the switching valve continuously and frequently moves in the working process, and the piston of the switching valve continuously rubs against the wall, so that not only is the temperature increased and partial noise generated, but also the piston becomes the most vulnerable part. The life of the piston therefore determines almost always the life of the machine, and in particular of machines that are used more frequently, the piston is liable to break, whereas in the machines of the prior art, the piston is a component that is difficult to avoid for large flow rates.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a long-life pressure swing adsorption oxygenerator is provided, change the technology structure of pressure swing adsorption oxygen generation to the valve structure that does not complicate replaces piston technology, is showing the life who improves the oxygenerator, reduces its periodic blasting noise simultaneously, and improves product integration and reduce cost under the prerequisite that improves the oxygen generation quality.

The long-life pressure swing adsorption oxygen generator comprises an upper cover with an air inlet nozzle, a pair of sieve barrels hermetically connected with the lower end face of the upper cover, and a base hermetically connected with the bottom end of the sieve barrels, wherein an air inlet and nitrogen discharge control system is arranged in the upper cover, the air inlet and nitrogen discharge control system 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 hermetically connected with the air inlet nozzle, and a pair of sieve barrel upper cover channels communicated with the upper end 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 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 switching valve is arranged in a cavity of the upper cover, and is sequentially provided with a connecting rod pad, a spring sleeved at the inner end part of the connecting rod, a connecting rod pressing sleeve which is arranged in the middle of the connecting rod in a surrounding way and is fixed with the upper cover, a valve frame, a supporting head fixedly arranged at the outer end part of the connecting rod and an isolation pad from inside to outside;

the inner side surface of the sealing cover is symmetrically provided with a pair of variable capacity grooves, an opening of each variable capacity groove is covered with an elastically stretchable movable cushion in a sealing manner, the edge of each movable cushion is hermetically pressed on the outer end surface of the variable capacity groove by the valve frame, the outer sides of the variable capacity grooves are respectively provided with a discharge groove, the bottom surfaces of the variable capacity grooves and the discharge grooves are respectively provided with variable capacity slotted holes and discharge slotted holes, 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 discharging openings are provided with a pair, and each discharge groove is respectively communicated with the nitrogen discharging openings on the same side in a sealing way through an independent air discharging channel 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 port A of the valve is communicated with the variable-capacity slotted hole in a sealing way, and the port B of the valve is communicated with the discharge slotted hole in a sealing way;

the isolating pad is in an elastically stretchable ring shape, the edge of the inner ring is fixed by the front part of the valve rod in a sealing mode, the edge of the outer ring is arranged between the connecting rod pressing sleeve and the valve frame in a sealing mode in a pressing mode, the connecting rod pressing sleeve and the isolating pad enclose an exhaust cavity with an inner end open, and the nitrogen exhaust port is communicated with the nitrogen exhaust bin and is arranged on the lower side of the exhaust cavity; the air inlet bin is arranged on the inner side of the valve rod, the connecting rod pad is provided with a switching cavity communicated with the sieve barrel upper cover channel, and the connecting rod pad is used for plugging the air inlet bin or the exhaust cavity.

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 exhaust 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 the air inlet pressure, the spring is in a stretching state at the moment, 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 spring force of the spring is set to be smaller than the intake pressure.

In an embodiment, the control circuit is a multivibrator 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.

Furthermore, the base 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 base passages 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, the pair of oxygen bin inlets are completely covered with a diaphragm, a pressing plate is fixedly arranged on the adjacent diaphragm and in the center of the diaphragm, two ends of the diaphragm are free ends, the free ends on one side, corresponding to the oxygen bin inlet, of the diaphragm are opened under the pressure of the output gas of the oxygen bin inlet on any side below, and one end, corresponding to the oxygen bin inlet, of one side is closed when no pressure exists.

In an embodiment, a nitrogen discharging port communicated with the atmosphere is arranged at the bottom of the nitrogen discharging bin, 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 optimize the overall structure of adsorption tower upper cover, disclose a novel and concrete diverter valve and nitrogen discharging amortization structure, cancelled frequent fricative piston structure, avoided moving part's the quick ageing problem that obviously generates heat and bring from this, and replace with elastic membrane structure, realize the varactor equally and the valve rod motion that promotes from this. Meanwhile, the compressed gas in the variable-capacity tank is released into a nitrogen discharging bin from an internal channel, the double-tower switching noise of pressure swing adsorption oxygen generation is reduced to be below 50 decibels from 70 decibels, the oxygen generation purity is improved to be 95% from 92% to stable output, the whole structure of the low-power oxygen generator is simplified, the pressure regulating valves are integrated into a whole, the size is further reduced, and the assembly process flow is simplified.

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 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 D-D of figure 3,

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

fig. 8 is a cross-sectional view taken along line I-I in fig. 7.

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 valve frame, 8-a movable pad, 9-a sealing cover, 10-a solenoid valve, 11-a sieve barrel, 12-a sealing pad, 13-a pressing plate, 14-a base, 15-a diaphragm, 16-a sieve barrel base channel, 17-a nitrogen discharging bin, 18-a sieve barrel upper cover channel, 19-an air inlet bin, 20-a discharging slot, 21-an isolating pad, 22-a variable volume slot, 23-a pressure regulating valve, 24-a high pressure oxygen bin, 25-a switching valve, 26-a nitrogen discharging port, 27-a discharging slot hole, 28-a variable volume slot hole, 29-a thrust hole, 30-a valve A port, 31-a valve B port, and 32-a valve C port, 33-an exhaust cavity, 34-a switching cavity, 35-a sieve barrel base, 36-an oxygen bin base, 37-a nitrogen bin base, 38-an oxygen bin inlet, 39-a supporting head, 40-a screw, 41-a supporting bowl and 42-an air discharge channel.

Detailed Description

The invention will be further described with reference to the following figures and examples: as shown in fig. 1, the long-life pressure swing adsorption oxygen generator comprises an upper cover 2 with an air inlet nozzle 1, a pair of sieve barrels 11 hermetically connected with the lower end surface of the upper cover, and a base 14 hermetically connected with the bottom end of the sieve barrels, wherein a nitrogen discharge 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; on the overall structure, only need external micro air compressor machine and oxygen output tube, the approximate process of oxygen preparation is, micro air compressor machine provides the air to upper cover 2, upper cover control is admitted air and is exhausted, it sends into sieve bucket 11 to admit air, the sieve bucket is filled with the molecular sieve stone, purpose-made molecular sieve stone can be effectively in the oxygen molecule inspiration hole that the diameter is less than its aperture, and keep off nitrogen gas and other compound gas molecules that are greater than the aperture outside the hole, thereby make the molecular separation of variation in size, oxygen distributes in sieve bucket 11 lower part after being separated out, gas distribution such as nitrogen gas and carbon dioxide is in the upper portion of sieve bucket, make the gas of output also divide into two tunnel. Oxygen enters the high-pressure oxygen bin 24 from the lower end of the sieve barrel, the high-pressure oxygen bin 24 also plays a role of pressure equalizing and buffering, and then the oxygen is output through the pressure reducing valve 23 and the oxygen conveying pipe; other gases still reversely enter the nitrogen discharging bin 17 from the original air inlet channel at the upper part of the sieve barrel, and are usually discharged to the atmosphere after being silenced. The exhaust nitrogen gas after the separation need discharge earlier the back and get into new air in order to guarantee the oxygen content of feed gas, will guarantee the continuity of air feed again simultaneously, has consequently set up double sieve bucket, makes oxygen and nitrogen discharging in turn to make the system oxygen incessant. The air inlet channel and the nitrogen exhaust channel of the sieve barrel share the air inlet channel, namely the channel 18 on the sieve barrel, so that the switching of a pair of sieve barrels and the air inlet and the exhaust of two paths of air in the sieve barrels are coordinated and orderly by an air inlet and nitrogen exhaust control system. The frequent sudden air discharge of compressed gas can cause periodic noise, and the fact that the electromagnetic valve is not used for directly switching the main gas circuit when the oxygen flow is large is also because the large electromagnetic valve has high noise and high cost, so that the miniature electromagnetic valve is generally adopted as a pilot control at present to guide the rubber valve rod to switch the gas flow. The rubber valve rod in the prior art uses the piston, and the piston rod is pushed to move by matching with the gas discharge of the closed space of the piston cylinder, so that the piston cylinder generates heat and the piston is accelerated to age in continuous reciprocating motion due to high motion frequency of the piston, and the piston becomes a vulnerable part of the oxygen generator. The utility model discloses the key that people found the valve body lies in opening and closing of gas circuit, and the piston is not necessary. And the damage rate of the valve body can be greatly reduced by avoiding the repeated friction of the piston, and the service life of the oxygen generator is obviously prolonged.

The structure of the specific air inlet and nitrogen outlet control system is matched with the novel valve body of the invention, and the detailed description is combined with the attached drawings and the embodiment.

The air inlet and nitrogen exhaust 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 exhaust passage, and the air inlet passage and the nitrogen exhaust 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 a sieve barrel upper cover channel 18 and a nitrogen discharge port 26.

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

The inner end part of the connecting rod 5 is positioned in the air inlet bin 19, the air inlet bins 19 where the 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 air exhaust cavity 33 enclosed by the connecting rod pressing sleeve 6, the outer end of the air exhaust cavity 33 is provided with an isolation pad 21 which is hermetically connected with the connecting rod and the connecting rod pressing sleeve 6, the isolation pad 21 has deformable elasticity, when the connecting rod moves, the air exhaust cavity 33 is still kept isolated from an air chamber at the outer end part of the connecting rod, the nitrogen exhaust port 26 is arranged at the lower side of the air exhaust cavity 33, the air exhaust cavity 33 is always communicated with the nitrogen exhaust port 26, and the nitrogen exhaust port 26 is provided with a pair of. The cavity where the connecting rod cushion 4 is located is a switching cavity 34, the switching cavity 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 exhaust cavity 33 through the connecting rod cushion 4 at the front end and the rear end respectively. Therefore, the outward movement of the connecting rod 5 controls the air intake of the sieve barrel upper cover channel 18 from the air inlet bin 19, and the inward movement of the connecting rod 5 controls the air exhaust of the sieve barrel upper cover channel 18 to the air exhaust cavity 33 to the nitrogen exhaust port 26. The isolating pad 21 is in an elastically stretchable ring shape, the edge of an inner ring is fixed by the front part of the valve rod in a sealing mode, the edge of an outer ring is arranged between the connecting rod pressing sleeve 6 and the valve frame 7 in a sealing mode in a pressing mode, and the connecting rod pressing sleeve 6 and the isolating pad 21 enclose an exhaust cavity 33 with an inner end opened. 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 switching valve 25 through the sieve barrel upper cover channel 18 and then enters the nitrogen discharging bin 17 through the switching valve 25.

In the air inlet state, the exhaust 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 air discharging 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 air discharging cavity 33.

As shown in fig. 3, 4, and 5, the cover 9 plays an important role in switching the state and eliminating noise. A pair of variable-capacity grooves 22 are symmetrically arranged on the inner side surface of the sealing cover 9, an opening of each variable-capacity groove 22 is covered with an elastically stretchable movable gasket 8 in a sealing mode, and the edge of each movable gasket 8 is arranged on the outer end surface of each variable-capacity groove in a sealing and pressing mode through the valve frame 7. As shown in fig. 2, the discharge grooves 20 are provided on the outer sides of the pair of variable capacity grooves 22, and the variable capacity grooves 28 and the discharge grooves 27 are provided on the bottom surfaces of the variable capacity grooves 22 and the discharge grooves 20, respectively. As shown in fig. 3, the cover 9 is further provided with a thrust hole 29 communicating with the inlet chamber 19 through a passage in the cover, and the connection passage of the thrust hole 29 is shown in fig. 6. Each vent groove 20 is in sealed communication with the same side of the nitrogen outlet 26 through a separate vent passage 42 in the upper cover 2, the vent passage 42 being seen in fig. 7 and 8.

As shown in fig. 3 and 4, the pair of electromagnetic valves 10 are two-position three-way electromagnetic valves; the three passage ports are respectively a valve A port 30, a valve B port 31 and a valve C port 32, and are controlled by a control circuit, 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 external links are: valve a port 30 is in sealing communication with the volume-changing port 28 and valve B port 31 is in sealing communication with the bleed port 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 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.

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 cushion 4 to be sealed and isolated from the air inlet bin 19 at the moment, and the exhaust 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 at the moment, 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 spring force of the spring 3 is set to be 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 high-pressure oxygen bin 24 and the nitrogen discharging bin 17 in a sealing manner, and the pair of sieve barrel bases 35 are respectively provided with a pair of sieve barrel base passages 16 communicated with the oxygen bin base 36.

The pair of sieve barrel base channels 16 are respectively provided with a pair of oxygen chamber inlets 38 communicated with the hyperbaric oxygen chamber 24 on an oxygen chamber base 36, the pair of oxygen chamber inlets 38 are completely covered with the diaphragm 15, a pressing plate 13 is fixedly arranged on the close vicinity of the diaphragm 15 and in the center of the diaphragm, so that two ends of the diaphragm are free ends, one free end corresponding to the oxygen chamber inlet is opened under the pressure of the output gas of the oxygen chamber inlet 38 on any side below, oxygen enters the hyperbaric oxygen chamber 24 from the sieve barrel on the corresponding side, and one end of the oxygen chamber inlet on the corresponding side is closed when no pressure exists. The bottom of the nitrogen discharge bin 17 is provided with a nitrogen discharge port communicated with the atmosphere, and silencing cotton can be arranged on the inner side of the nitrogen discharge port.

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.

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, 4 and 5 is connected with the left-side variable volume tank, and during the working process of the oxygenerator:

referring to fig. 3, 4 and 5, the left solenoid valve works in the gas state of the variable volume tank, the left connecting rod works in the nitrogen discharging state, the valve C port 32 of the left solenoid valve is communicated with the thrust hole 29 of the cover 9, when the variable volume tank on the left side is filled with gas, the valve C port 32 of the left solenoid valve is communicated with the valve a port 30, the valve B port 31 of the solenoid valve bleed passage of the variable volume tank on the left side is closed, compressed air enters the variable volume tank 22 on the left side from the thrust hole 29, the pressure at two ends of the connecting rod 5 on the left side is balanced, under the action of the restoring force of the spring 3, the left connecting rod retracts, so that the connecting rod cushion 4 at the outer end on the left side opens the exhaust cavity 33 on the left side, the exhaust cavity 33 is communicated with the sieve barrel on the left side, the sieve barrel on the left side discharges nitrogen, the connecting rod cushion 4 at the inner end on the left side seals the gas inlet bin 19 on, see nitrogen discharge path c in fig. 3 and 4. At the beginning of the air discharge state of the solenoid valve switched to the variable volume groove 22, the valve A port 30 is communicated with the valve B port 31, the compressed air in the left variable volume groove 22 is quickly discharged through the air discharge passage 42, the discharge noise is shielded in the passage, and the external noise is remarkably reduced because the nitrogen is not directly discharged through the solenoid valve. The release path is shown as path b in fig. 3 and 4.

While the left solenoid valve is in the air inlet of the left variable volume tank 22, a set of symmetrical systems on the right work in the air discharge state that the opposite phase signal drives the right 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 variable volume groove, due to the fact that the relative pressure of compressed air is large, a right piston rod is pushed by air pressure to move downwards quickly during air release, a connecting rod pad at the outer end seals an air exhaust cavity 33, a right air inlet channel is opened, and a right sieve barrel enters an air inlet state. At this time, the solenoid thrust hole 29 of the right variable volume groove is blocked from the intake passage, see the left solenoid valve of fig. 4. The gas in the right volume-variable groove passes through the valve A port 30 of the right electromagnetic valve, the valve B port 31, the right discharge groove 20 and the right discharge channel 42, enters the nitrogen discharge bin 17, the noise generated by the release of the compressed gas in the discharge cavity 33 is completely sealed in the channel, and the burst noise generated by the discharge is greatly reduced. Referring to the exhaust path b in fig. 4, the exhaust passage at the moment when the solenoid valve is switched to the air bleeding state is shown. At this time, because the right variable volume groove is deflated, the air pressure in the variable volume groove is reduced, the right connecting rod rapidly extends and seals the right exhaust cavity 33 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. 4, the air inlet bin 19 is communicated with the upper cover channel 18 of the right sieve bin, compressed air enters the right sieve bin 11, a new stream of compressed air enters the right sieve bin and passes through sieve stones in the sieve bin to separate oxygen, high-pressure oxygen pushes the right diaphragm 15 at the bottom of the high-pressure oxygen bin 24 from the sieve bin base channel 16 of the right sieve bin to enter the high-pressure oxygen bin 24, and the oxygen airflow 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 variable-volume groove is sealed or communicated only through the electromagnetic valve, so that the connecting rod can move axially without friction of the piston, the temperature rise and aging of rubber are obviously reduced, and the service life of the rubber part is obviously prolonged. The control design is ingenious, the integral integration level is high, the integral 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. A long-life pressure swing adsorption oxygenerator 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 end of the sieve barrels, wherein an air inlet and nitrogen outlet control system is arranged in the upper cover (2), the air inlet and nitrogen outlet control system comprises a control circuit, a distribution air passage and a switching valve (25), the distribution air passage is provided with a nitrogen outlet (26), an air inlet bin (19) in sealing connection 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), and the air inlet bin (19) is respectively communicated with the sieve barrel upper cover channels (18) and the nitrogen outlet (26) under the action of the control circuit through the switching 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) from inside to outside in the horizontal direction, 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 of the connecting rod (5) in a surrounding manner 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;

a pair of variable-capacity grooves (22) are symmetrically arranged on the inner side surface of the sealing cover (9), an opening of each variable-capacity groove (22) is covered with an elastically stretchable movable cushion (8) in a sealing manner, the edges of the movable cushions (8) are arranged on the outer end surface of the variable-capacity groove in a sealing manner by the valve frame (7), discharge grooves (20) are respectively arranged on the outer sides of the variable-capacity grooves (22), variable-capacity slotted holes (28) and discharge slotted holes (27) are respectively arranged on the bottom surfaces of the variable-capacity grooves (22) and the discharge grooves (20), and the sealing cover (9) is further provided with a thrust hole (29) communicated with the air inlet bin (19) through a channel in the sealing cover; a pair of nitrogen discharge ports (26) is arranged, 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 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 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 discharge slotted hole (27) in a sealing way;

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

2. The long-life pressure swing adsorption oxygen generator of claim 1, wherein: 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 air exhaust 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 at the moment, 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 to be smaller than the intake pressure.

3. The long-life 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.

4. The long-life pressure swing adsorption oxygen generator 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 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 base channels (16) communicated with the oxygen bin base (36).

5. The long-life pressure swing adsorption oxygen generator of claim 4, wherein: a pair of oxygen bin inlets (38) are formed in the oxygen bin base (36) of the sieve barrel base channel (16), a diaphragm (15) is completely covered on the pair of oxygen bin inlets (38), a pressing plate (13) is fixedly arranged on the adjacent diaphragm (15) and in the center of the diaphragm, two ends of the diaphragm are free ends, the free end on one side, corresponding to the oxygen bin inlet, is opened under the pressure of the output gas of the oxygen bin inlet (38) on any side below, and one end of the oxygen bin inlet on the corresponding side is closed when no pressure exists.

6. The long-life pressure swing adsorption oxygen generator of claim 1, wherein: the bottom of 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.