Oxygen generator adsorption tower air intake and nitrogen exhaust system and control method thereof

Abstract

An oxygen generator adsorption tower air intake and nitrogen exhaust system and its control method are disclosed. The system comprises three buffer chambers—an air compressor chamber, a first inlet chamber, and a second inlet chamber—with four membrane chambers spaced apart inside the adsorption tower cover. Each membrane chamber has two independent channels covered by membranes at its bottom, with one end of each membrane fixed to the bottom of the chamber by membrane fixing pins. Four two-position three-way solenoid valves on the upper surface of the adsorption tower cover control the opening and closing of the membranes within the chambers, thus orderly controlling the four solenoid valves to achieve alternating air intake and nitrogen exhaust from both chambers. This invention achieves high-purity continuous oxygen production via pressure swing adsorption (PSA) using the simplest structure. It eliminates the previously indispensable core component, the piston valve, significantly reducing the number of components. Trial production has proven that assembly difficulty is greatly reduced, production cycle is shortened, and reliability and maintainability are significantly improved, while oxygen production is continuous, high in purity, and stable in operation.

Description

Technical Field

[0001] The invention relates to oxygen production technology, in particular to an oxygen generator adsorption tower air intake and nitrogen exhaust system and a control method thereof. Background Art

[0002] Pressure swing adsorption oxygen generation is the most popular direction for the development of oxygen generators. However, pressure swing adsorption oxygen generation has always faced the problems of low oxygen purity and complex equipment structure. The best structural system in the prior art uses a valve stem with a piston ring to produce a reciprocating action mechanism through the interaction between the pilot solenoid valve and the spring, and cooperates with compressed air to achieve the functions of air intake and nitrogen exhaust. However, the overall structure is complex, involving many parts and components, a long assembly line, and low production efficiency, resulting in increased production costs and difficult maintenance. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an oxygen generator adsorption tower air intake and nitrogen exhaust system and a control method thereof, which greatly simplifies the structure of the overall oxygen production and nitrogen exhaust system without reducing the purity of oxygen production, and the control and operation are stable and reliable, thereby improving production efficiency.

[0004] The oxygen generator adsorption tower air intake and nitrogen exhaust system comprises an adsorption tower cover, a pair of sieve barrels and a control panel. The pair of sieve barrels are fixedly arranged below the adsorption tower cover. Molecular sieve stones are filled in the sieve barrels to adsorb nitrogen and filter out oxygen. An air intake nozzle for connecting an air compressor is provided on one side of the adsorption tower cover. The system is characterized in that:

[0005] Inside the adsorption tower cover: there are three buffer bins, namely, an air compression bin, a first barrel inlet bin and a second barrel inlet bin, and four diaphragm bins, namely, a first diaphragm bin, a second diaphragm bin, a third diaphragm bin and a fourth diaphragm bin. The air compression bin is located in the middle and is connected to the air inlet nozzle. The first barrel inlet bin and the second barrel inlet bin are located on both sides of the air compression bin respectively. The four diaphragm bins are arranged in sequence with intervals from the buffer bin.

[0006] Each diaphragm bin is provided with two independent channels at the bottom, the channel openings of the two independent channels are on the same horizontal plane and covered by the same diaphragm, and one end of the diaphragm is fixed to the bottom of the diaphragm bin by a membrane fixing nail; the two channels of the first diaphragm bin are the nitrogen discharge hole and the upper screen barrel hole, which are connected to the outside atmosphere and the first screen barrel respectively; the two channels of the second diaphragm bin are the screen bin hole and the empty bin hole, which are connected to the first barrel inlet bin and the air pressure bin respectively; the third diaphragm bin and the fourth diaphragm bin are symmetrically arranged with the second diaphragm bin and the first diaphragm bin respectively;

[0007] Four two-position three-way solenoid valves are arranged on the upper surface of the adsorption tower cover. The internal channels of the two-position three-way solenoid valves are controlled by the control board. When the valve is opened, interface A is connected with interface B, and interface A is blocked with interface C. When the valve is closed, interface A is blocked with interface B, and interface A is connected with interface C.

[0008] External connection paths of the four two-position three-way solenoid valves: interface A of the first solenoid valve is sealed and connected to the upper part of the first diaphragm bin, and interface C of the first solenoid valve is sealed and connected to the first barrel inlet bin; interface A of the second solenoid valve is sealed and connected to the upper part of the second diaphragm bin, and interface C of the second solenoid valve is sealed and connected to the air compression bin; the third solenoid valve and the fourth solenoid valve are symmetrically arranged with the second solenoid valve and the first solenoid valve respectively; interfaces B of the first, second, third and fourth solenoid valves are all connected to the atmosphere.

[0009] The interface A of the two-position three-way solenoid valve is arranged above the diaphragm of the diaphragm bin and close to the free end of the diaphragm. The depth of the diaphragm bin is set so that when the free end of the diaphragm is opened, the diaphragm seals the interface A.

[0010] The control method of the air intake and nitrogen exhaust system of the oxygen generator adsorption tower is characterized in that: the air pressure in the diaphragm bin is controlled by the solenoid valve to determine the connection and disconnection of the two channel ports covered by the diaphragm, and the four two-position three-way solenoid valves are orderly controlled to realize continuous oxygen production and nitrogen exhaust; the orderly control process is: when the air intake and nitrogen exhaust system of the oxygen generator adsorption tower is in the waiting working state, the power is turned on during operation, the air compressor provides compressed air to inlet from the air inlet nozzle, the second solenoid valve and the third solenoid valve are controlled to synchronously enter the opposite valve opening state and valve closing state respectively, and the working state is synchronously and periodically reversed, and the reversal period is 1.5 to 6 seconds, the first solenoid valve is controlled to open the valve for at least 0.5 seconds in the valve closing state of the second solenoid valve, and the fourth solenoid valve is controlled to open the valve for at least 0.5 seconds in the valve closing state of the third solenoid valve.

[0011] The valve open state is that the interface A of the two-position three-way solenoid valve is connected to the interface B, and the interface A is blocked from the interface C, that is, the interface A is exhausted to the outside atmosphere, the diaphragm is opened to connect the two channels covered by the diaphragm, and the diaphragm closes the interface A;

[0012] The valve closing state is that interface A is blocked from interface B, interface A is connected to interface C, the pressure of the diaphragm compartment is maintained, and the connection between the two channels covered by the diaphragm is cut off.

[0013] The waiting working state is that the air inlet nozzle is connected to the output end of the air compressor, and the lower end of the screen barrel is connected to the oxygen output port through the oxygen bin and the pressure reducing valve.

[0014] The control of the open state of the two-position three-way solenoid valve is achieved by providing a working voltage to the control line of the two-position three-way solenoid valve through the circuit board, and the control of the closed state is achieved by shutting off the working voltage to the control line of the two-position three-way solenoid valve through the circuit board.

[0015] Alternatively, the open state of the two-position three-way solenoid valve is controlled by the circuit board cutting off the working voltage to the control line of the two-position three-way solenoid valve, and the closed state is controlled by the circuit board providing the working voltage to the control line of the two-position three-way solenoid valve.

[0016] The present invention discloses an oxygen generator adsorption tower air intake and nitrogen exhaust system, which realizes high-purity continuous oxygen production by air separation in a pressure swing adsorption mode with the simplest structure to date. The overall solution omits the piston valve, which has always been an indispensable core component, and the overall number of parts is greatly reduced. After trial production, it has been proved that the difficulty of assembly is greatly reduced, the production cycle is shortened, and the reliability and maintainability are greatly improved, and the oxygen production is continuous, the purity is high, and the operation is stable.

[0017] The present invention directly determines the air flow interruption of the air intake and nitrogen exhaust channels through an electromagnetic valve that is easy to accurately control. Specifically, the state of the diaphragm is determined by the air pressure difference on both sides of the diaphragm. When the air pressure below the diaphragm is greater than the air pressure above the diaphragm, the diaphragm opens and at the same time blocks the channel interface of the electromagnetic valve, so that the air intake or nitrogen exhaust channel below the diaphragm is connected. After the air intake or nitrogen exhaust action is completed, the state of the electromagnetic valve can be controlled to switch to another screen barrel for oxygen intake, so that the oxygen production output is continuous. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0019] Figure 2 This is an enlarged view of the solenoid valve structure.

[0020] Figure 3 It is a vertical cross-sectional view of the overall structure of the present invention through the symmetry plane,

[0021] Figure 4 This is the solenoid valve control timing diagram of the present invention.

[0022] Figure 5 This is an embodiment of the control circuit of the present invention.

[0023] In the figure: 1-the third solenoid valve, 2-the lower sieve barrel hole, 3-the membrane fixing nail, 4-the first barrel inlet bin, 5-the first diaphragm bin, 6-the diaphragm, 7-the nitrogen exhaust hole, 8-the upper sieve barrel hole, 9-the first solenoid valve, 10-the second diaphragm bin, 11-the sieve bin hole, 12-the empty bin hole, 13-the second solenoid valve, 14-the air pressure bin, 15-the third diaphragm bin, 16-the fourth solenoid valve, 17-the second barrel inlet bin, 18-the fourth diaphragm bin, 19-the adsorption tower cover, 20-the air inlet nozzle, 21-the first sieve barrel, 22-the second sieve barrel, 23-the interface A, 24-the interface B, 25-the interface C, 26-the control line. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 The oxygen generator adsorption tower air intake and nitrogen exhaust system shown includes an adsorption tower cover 19, a pair of sieve barrels and a control panel. This is the basic configuration of a pressure swing adsorption oxygen generator. The air intake and nitrogen exhaust control are arranged in the adsorption tower cover 19.

[0025] A pair of sieve barrels are fixedly arranged under the adsorption tower cover. Molecular sieve stones are filled in the sieve barrels to adsorb gases such as nitrogen and carbon dioxide and filter out oxygen, which is output through the oxygen bin and the pressure reducing valve. An air inlet 20 for connecting to an air compressor is provided on one side of the adsorption tower cover 19. Compressed air enters the two sieve barrels in turn, and the two sieve barrels output oxygen alternately, so that the output of oxygen is continuous.

[0026] like Figure 1 The entire air intake and nitrogen exhaust control of the present invention is concentrated in the adsorption tower cover 19, and the structure is simple.

[0027] Inside the adsorption tower cover 19, there are three buffer bins, namely, the air compression bin 14, the first barrel inlet bin 4 and the second barrel inlet bin 17, and four diaphragm bins, namely, the first diaphragm bin 5, the second diaphragm bin 10, the third diaphragm bin 15 and the fourth diaphragm bin 18. The air compression bin 14 is located in the middle and is connected to the air inlet nozzle 20. The first barrel inlet bin 4 and the second barrel inlet bin 17 are located on both sides of the air compression bin 14, respectively. The four diaphragm bins are arranged in sequence with the buffer bins at intervals. The adsorption tower cover 19 is actually formed by sealing and splicing the adsorption tower upper cover and the adsorption tower lower cover, such as Figure 3 In the embodiment, three buffer bins are arranged in the lower cover of the adsorption tower, and four membrane bins are arranged in the upper cover of the adsorption tower or the lower cover of the adsorption tower. Figure 1 As shown, the seven chambers in the adsorption tower cover 19 are the first diaphragm chamber 5, the first barrel inlet chamber 4, the second diaphragm chamber 10, the air pressure chamber 14, the third diaphragm chamber 15, the second barrel inlet chamber 17 and the fourth diaphragm chamber 18 from left to right. The seven chambers are sealed from the outside and are only connected to other chambers through channels. The bottom of each diaphragm chamber is provided with two independent channels, and the channel openings of the two independent channels are on the same horizontal plane. In the embodiment shown in the figure, they are all arranged on the bottom surface of the diaphragm chamber and are covered by the same diaphragm 6. The diaphragm 6 is a flexible silicone sheet. One end of the diaphragm is fixed to the bottom of the diaphragm chamber by a membrane fixing nail 3, and the other end is a free end. The top of each diaphragm chamber is connected to the interface A23 of the solenoid valve. Therefore, when the diaphragm 6 faces downward pressure, it is close to the two channel openings and the connection between the two channels is cut off; when the diaphragm 6 faces upward pressure, the free end of the diaphragm that is not fixed will be lifted by the pressure below, so that the two channels are connected. At the same time, the diaphragm rises to seal the interface A23.

[0028] The two channels of the first diaphragm compartment 5 are the nitrogen discharge hole 7 and the upper sieve barrel hole 8. The nitrogen discharge hole 7 is connected to the outside atmosphere through the channel inside the adsorption tower cover, and the upper sieve barrel hole 8 is connected to the first sieve barrel 21 through the channel inside the adsorption tower cover.

[0029] The two channels of the second diaphragm bin 10 are a sieve bin hole 11 and an empty bin hole 12. The sieve bin hole 11 is connected to the first barrel inlet bin 4 through a channel inside the adsorption tower cover, and the empty bin hole 12 is connected to the air compression bin 14 through a channel inside the adsorption tower cover.

[0030] The third diaphragm bin 15 and the fourth diaphragm bin 18 are respectively symmetrically arranged with the second diaphragm bin 10 and the first diaphragm bin 5. That is, the third diaphragm bin 15 is also provided with a sieve bin hole and an empty bin hole, the sieve bin hole is connected with the second barrel inlet bin 17 through the channel inside the adsorption tower cover, and the empty bin hole is connected with the air pressure bin 14 through the channel inside the adsorption tower cover. The fourth diaphragm bin 18 is provided with a nitrogen discharge hole and a lower sieve barrel hole, the nitrogen discharge hole is connected with the outside atmosphere through the channel inside the adsorption tower cover, and the lower sieve barrel hole is connected with the second sieve barrel 22 through the channel inside the adsorption tower cover.

[0031] Four two-position three-way solenoid valves are provided on the upper surface of the adsorption tower cover 19. In the internal channels of the two-position three-way solenoid valves: Figure 2 As shown, the two-position three-way solenoid valve is provided with an interface A23, an interface B24 and an interface C25, and a pair of control lines 26 are connected to the internal coil of the solenoid valve. There are two types of solenoid valves, and each type has two states. For one type of solenoid valve, when the control line 26 has a working voltage, the interface A23 is connected to the interface B24, and the interface A23 is blocked from the interface C25; when the control line 26 loses the working voltage or has no voltage, the interface A23 is blocked from the interface B24, and the interface A23 is connected to the interface C25. For another type of solenoid valve, on the contrary, when the control line 26 has a working voltage, the interface A23 is blocked from the interface B24, and the interface A23 is connected to the interface C25; when the control line 26 loses the working voltage or has no voltage, the interface A23 is connected to the interface B24, and the interface A23 is blocked from the interface C25.

[0032] Here, it is uniformly defined that when the valve is opened under control, the interface A23 is connected to the interface B24, and the interface A23 is blocked from the interface C25; when the valve is closed under control, the interface A23 is blocked from the interface B24, and the interface A23 is connected to the interface C25.

[0033] External connection paths of four two-position three-way solenoid valves: Figure 1 , the four two-position three-way solenoid valves are arranged in sequence from left to right, and the interfaces B24 of the four two-position three-way solenoid valves are all connected to the atmosphere; the interface A23 of the first solenoid valve 9 is sealed and connected to the upper part of the first diaphragm bin 5, and the interface C25 of the first solenoid valve 9 is sealed and connected to the first barrel inlet bin 4; the interface A23 of the second solenoid valve 13 is sealed and connected to the upper part of the second diaphragm bin 10, and the interface C25 of the second solenoid valve 9 is sealed and connected to the air compression bin 14; the third solenoid valve 1 and the fourth solenoid valve 16 are symmetrically arranged with the second solenoid valve 13 and the first solenoid valve 9 respectively, that is, the interface A23 of the fourth solenoid valve 16 is sealed and connected to the fourth diaphragm bin 18, and the interface C25 of the fourth solenoid valve 16 is sealed and connected to the second barrel inlet bin 17; the interface A23 of the third solenoid valve 1 is sealed and connected to the upper part of the third diaphragm bin 15, and the interface C25 of the third solenoid valve 15 is sealed and connected to the air compression bin 14.

[0034] The interface A23 of the two-position three-way solenoid valve is arranged in the middle of the diaphragm 6 above the diaphragm bin, close to the free end of the diaphragm, and the depth of the diaphragm bin is set so that when the free end of the diaphragm 6 is opened, the diaphragm 6 seals the interface A23. Therefore, the diaphragm bin is arranged shallowly, and the empty bin holes of the second diaphragm bin 10 and the third diaphragm bin 15 can be connected to the side wall of the air pressure bin 14 from the bottom of the diaphragm bin, and the screen bin holes of the second diaphragm bin 10 and the third diaphragm bin 15 can be connected to the side wall of the first or second barrel inlet bin from the bottom of the diaphragm bin.

[0035] The control method of the above-mentioned oxygen generator adsorption tower air intake and nitrogen exhaust system is to use a solenoid valve to control the air pressure in the diaphragm bin to determine the connection and disconnection of the two channel openings covered by the diaphragm. When the solenoid valve connects interface A to the outside, the air pressure in the diaphragm bin is reduced, and the diaphragm is lifted up by the air pressure below and fits to interface A to shut off interface A, so that the two channels below the diaphragm are connected. The four two-position three-way solenoid valves are controlled in an orderly manner to allow the two sieve barrels to alternately intake and exhaust nitrogen, thereby achieving continuous oxygen production and nitrogen exhaust. The orderly control process is to set the oxygen generator adsorption tower air intake and nitrogen exhaust system to a waiting state, turn on the power when working, and the air compressor provides compressed air to intake from the air inlet nozzle 20, such as Figure 3 The control timing diagram is as follows: the second solenoid valve 13 and the third solenoid valve 1 are controlled to synchronously enter the opposite open valve state and closed valve state respectively, and the working state is synchronously and periodically reversed, and the reversal period is 1.5 to 6 seconds. The first solenoid valve 9 is controlled to open the valve in the closed valve state of the second solenoid valve 13 for at least 0.5 seconds, and the fourth solenoid valve 16 is controlled to open the valve in the closed valve state of the third solenoid valve 1 for at least 0.5 seconds. Figure 4 The invention is an embodiment of the control circuit. After the multivibrator outputs a square wave periodically, the positive and negative phases trigger a monostable trigger respectively, and the output signals are respectively connected to the control ends of four solenoid valves.

[0036] The open valve state refers to that the interface A23 of the two-position three-way solenoid valve is connected with the interface B24, and the interface A23 is blocked with the interface C25, that is, the interface A23 exhausts to the outside atmosphere, the diaphragm 6 opens to connect the two channels covered by the diaphragm, and the diaphragm closes the interface A23. The closed valve state refers to that the interface A23 is blocked with the interface B24, the interface A23 is connected with the interface C25, the pressure of the diaphragm bin is maintained, and the connection of the two channels covered by the diaphragm is cut off. The control of the open valve state of the two-position three-way solenoid valve is achieved by providing a working voltage to the control line 26 of the two-position three-way solenoid valve by the circuit board, and the control of the closed valve state is achieved by shutting off the working voltage to the control line 26 of the two-position three-way solenoid valve by the circuit board. Alternatively, the control of the open valve state of the two-position three-way solenoid valve is achieved by shutting off the working voltage to the control line 26 of the two-position three-way solenoid valve by the circuit board, and the control of the closed valve state is achieved by providing a working voltage to the control line 26 of the two-position three-way solenoid valve by the circuit board.

[0037] The waiting working state is that the air inlet nozzle 20 is connected to the output end of the air compressor, and the lower end of the sieve barrel is connected to the oxygen output port through the oxygen bin and the pressure reducing valve.

[0038] Working process: Assume that Figure 3 The second solenoid valve 13 starts to open the valve first, and then the second solenoid valve 13 connects the second diaphragm bin 10 with the atmosphere. After the compressed air enters the air compression bin 14 from the air inlet nozzle 20, it is connected to the empty bin hole 12 from the bottom of the second diaphragm bin 10. The compressed air pushes up the diaphragm 6 of the second diaphragm bin 10 from the bottom of the diaphragm 6 through the empty bin hole 12. After the diaphragm is blown, it fits to the interface A23 of the second solenoid valve 13. At the same time, the opened diaphragm connects the empty bin hole 12 with the sieve bin hole 11. The sieve bin hole 11 passes through the first barrel inlet bin 4 and enters the first sieve barrel 21. After the compressed air passes through the sieve stone of the first sieve barrel 21, the filtered oxygen flows out from the bottom of the first sieve barrel to the oxygen bin, and then is output through the pressure reducing valve. The remaining nitrogen and other gases after filtration by the first sieve barrel 21 remain in the upper part of the first sieve barrel 21. When the open state of the second solenoid valve 13 is flipped to the closed state, the interface A of the second solenoid valve 13 is connected with the interface C, and the compressed air is blown out from the interface A through the interface C, pressing down the diaphragm 6 of the second diaphragm bin 10, and due to the air pressure difference and the gravity of the diaphragm, the diaphragm is attached and blocks the sieve bin hole 11 and the empty bin hole 12, and the air inlet channel of the first inlet bin 4 is closed. When the first solenoid valve 9 opens, the first solenoid valve 9 opens the first diaphragm bin 5 to the atmosphere, and the upper sieve barrel hole 8 connected to the first sieve barrel 21 is pushed open by the residual air pressure in the first sieve barrel 21 to push open the diaphragm of the first diaphragm bin, and the nitrogen on the upper part of the first sieve barrel is discharged from the open upper sieve barrel hole 8 through the nitrogen exhaust hole 7 to the outside atmosphere. During the closing process of the second solenoid valve, the third solenoid valve 1 opens to send compressed air to the second sieve barrel 22. Therefore, the second sieve barrel takes in air while the first sieve barrel discharges nitrogen. When the second sieve barrel is closed, the third solenoid valve closes and the fourth solenoid valve opens to discharge nitrogen. The first sieve barrel and the second sieve barrel alternately take in air and discharge nitrogen, so that the oxygen in the oxygen tank is continuously output.

Claims

1. An oxygen generator adsorption tower air intake and nitrogen exhaust system, comprising an adsorption tower cover (19), a pair of sieve barrels and a control panel, wherein the pair of sieve barrels are fixedly arranged below the adsorption tower cover, the sieve barrels are filled with molecular sieve sieve stones for adsorbing nitrogen and filtering out oxygen, and an air intake nozzle (20) for connecting to an air compressor is arranged on one side of the adsorption tower cover (19), characterized in that: Inside the adsorption tower cover (19), there are three buffer bins, namely an air compression bin (14), a first barrel inlet bin (4) and a second barrel inlet bin (17), and four diaphragm bins, namely a first diaphragm bin (5), a second diaphragm bin (10), a third diaphragm bin (15) and a fourth diaphragm bin (18). The air compression bin (14) is arranged in the middle and is connected to the air inlet nozzle (20). The first barrel inlet bin (4) and the second barrel inlet bin (17) are respectively arranged on both sides of the air compression bin (14). The four diaphragm bins are arranged in sequence with the buffer bins spacing them apart. Each diaphragm bin is provided with two independent channels at the bottom, the channel openings of the two independent channels are on the same horizontal plane and are covered by the same diaphragm (6), one end of the diaphragm is fixed to the bottom of the diaphragm bin by a membrane fixing nail (3), the two channels of the first diaphragm bin (5) are the nitrogen discharge hole (7) and the upper screen barrel hole (8), which are respectively connected to the outside atmosphere and the first screen barrel (21); the two channels of the second diaphragm bin (10) are the screen bin hole (11) and the empty bin hole (12), which are respectively connected to the first barrel inlet bin (4) and the air pressure bin (14); the third diaphragm bin (15) and the fourth diaphragm bin (18) are respectively arranged symmetrically with the second diaphragm bin (10) and the first diaphragm bin (5); Four two-position three-way solenoid valves are provided on the upper surface of the adsorption tower cover (19). In the internal passages of the two-position three-way solenoid valves, the control panel controls that when the valves are opened, the interface A (23) is connected to the interface B (24), and the interface A (23) is blocked from the interface C (25); when the valves are closed, the interface A (23) is blocked from the interface B (24), and the interface A (23) is connected to the interface C (25); The external connection paths of the four two-position three-way solenoid valves are as follows: the interface A (23) of the first solenoid valve (9) is in sealed communication with the upper part of the first diaphragm bin (5), and the interface C (25) of the first solenoid valve (9) is in sealed communication with the first barrel inlet bin (4); the interface A (23) of the second solenoid valve (13) is in sealed communication with the upper part of the second diaphragm bin (10), and the interface C (25) of the second solenoid valve (13) is in sealed communication with the air pressure bin (14); the third solenoid valve (1) and the fourth solenoid valve (16) are symmetrically arranged with the second solenoid valve (13) and the first solenoid valve (9), respectively; and the interfaces B (24) of the first, second, third and fourth solenoid valves are all in sealed communication with the atmosphere.

2. The oxygen generator adsorption tower air intake and nitrogen exhaust system according to claim 1, characterized in that: The interface A (23) of the two-position three-way solenoid valve is arranged above the diaphragm (6) of the diaphragm bin and close to the free end of the diaphragm. The depth of the diaphragm bin is set so that when the free end of the diaphragm (6) is opened, the diaphragm (6) seals the interface A (23).

3. A control method for an oxygen generator adsorption tower air intake and nitrogen exhaust system according to claim 1, characterized in that: The electromagnetic valve is used to control the air pressure in the diaphragm bin to determine the connection and disconnection of the two channel ports covered by the diaphragm, and the four two-position three-way electromagnetic valves are controlled in an orderly manner to realize continuous oxygen production and nitrogen exhaust; the orderly control process is: when the air intake and nitrogen exhaust system of the oxygen generator adsorption tower is in a waiting working state, the power is turned on during operation, the air compressor provides compressed air to intake air from the air intake nozzle (20), the second electromagnetic valve (13) and the third electromagnetic valve (1) are controlled to synchronously enter the opposite valve opening state and valve closing state respectively, and the working state is synchronously and periodically reversed, and the reversal period is 1.5 to 6 seconds, the first electromagnetic valve (9) is controlled to open the valve for at least 0.5 seconds in the valve closing state of the second electromagnetic valve (13), and the fourth electromagnetic valve (16) is controlled to open the valve for at least 0.5 seconds in the valve closing state of the third electromagnetic valve (1).

4. The control method according to claim 3, characterized in that: The valve open state is that the interface A (23) of the two-position three-way solenoid valve is connected to the interface B (24), and the interface A (23) is blocked from the interface C (25), that is, the interface A (23) is exhausted to the outside atmosphere, the diaphragm (6) is opened to connect the two channels covered by the diaphragm, and the diaphragm closes the interface A (23); The valve closing state is that the interface A (23) and the interface B (24) are blocked, the interface A (23) and the interface C (25) are connected, the pressure of the diaphragm compartment is maintained, and the connection between the two channels covered by the diaphragm is cut off.

5. The control method according to claim 3, characterized in that: The waiting working state is that the air inlet nozzle (20) is connected to the output end of the air compressor, and the lower end of the sieve barrel is connected to the oxygen output port through the oxygen bin and the pressure reducing valve.

6. The control method according to claim 3, characterized in that: The control of the open state of the two-position three-way solenoid valve is achieved by providing a working voltage to the control line (26) of the two-position three-way solenoid valve through the circuit board, and the control of the closed state is achieved by shutting off the working voltage to the control line (26) of the two-position three-way solenoid valve through the circuit board.

7. The control method according to claim 3, characterized in that: The control of the open state of the two-position three-way solenoid valve is achieved by cutting off the working voltage of the control line (26) of the two-position three-way solenoid valve through the circuit board, and the control of the closed state is achieved by providing the working voltage to the control line (26) of the two-position three-way solenoid valve through the circuit board.

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