Integrated two-bed molecular sieve oxygen generator

Abstract

The application discloses an integrated two-bed molecular sieve oxygen generator, which comprises a first molecular sieve bed, a second molecular sieve bed, an oxygen tank, a bottom plate, a comprehensive switching seat, a first electromagnetic valve, a second electromagnetic valve and a three-way valve assembly. The first molecular sieve bed, the second molecular sieve bed, the oxygen tank and the comprehensive switching seat are respectively installed on the bottom plate and are correspondingly connected. The three interfaces of the three-way valve assembly are respectively connected with an oxygen outlet at the upper end of the first molecular sieve bed, an oxygen outlet at the upper end of the second molecular sieve bed and an air inlet of the oxygen tank. The first molecular sieve bed, the second molecular sieve bed, the oxygen tank, the bottom plate, the comprehensive switching seat, the first electromagnetic valve, the second electromagnetic valve and the three-way valve assembly are cooperatively designed, multiple scattered components in the traditional structure are effectively integrated, multiple pipelines are saved, the system gas circuit is greatly simplified, the system integration and the modularization degree are improved, the interfaces are reduced, and the air tightness reliability and the oxygen production efficiency are improved.

Description

Technical Field

[0001] This invention relates to a molecular sieve oxygen generator, and more particularly to an integrated two-bed molecular sieve oxygen generator having two molecular sieve beds. Background Technology

[0002] Molecular sieve oxygen generation systems mostly use the pressure swing adsorption (PSA) principle to generate oxygen. The basic principle is: compressed air enters the molecular sieve bed, nitrogen in the air is adsorbed and oxygen is discharged. This is the oxygen generation process. When the compressed air stops entering the molecular sieve bed, the adsorbed nitrogen is discharged by oxygen backflushing. This is the nitrogen removal process. The two processes are continuously cyclical and alternate.

[0003] A two-bed molecular sieve oxygen generator is an oxygen generator with two molecular sieve beds, such as... Figures 1-4 As shown, a traditional two-bed molecular sieve oxygen generator includes two molecular sieve beds 3 and a gas storage tank 9. Each molecular sieve bed 3 has a switching seat 2 installed at one end. The switching seat 2 is equipped with a solenoid valve 1 for switching control of the three interfaces of the switching seat 2. The air inlet interfaces of the two switching seats 2 are connected to the air inlet pipe 8 through the air pipe 5. The air inlet pipe 8 is used to connect to the outlet of the air compressor. The nitrogen exhaust interfaces of the two switching seats 2 are connected to the nitrogen exhaust pipe 6 through the nitrogen pipe 4. The nitrogen exhaust pipe 4 can directly discharge nitrogen into the air or connect to an external nitrogen tank. Each molecular sieve bed 3 has a one-way valve 7 installed at the other end and a nitrogen backflush interface 12. The outlets of the two one-way valves 7 are connected to the inlet of the gas storage tank 9 through the oxygen pipe 10. The two nitrogen backflush interfaces 12 are connected by a backflush nitrogen pipe 11. The main components inside the one-way valve 7 include a diaphragm 14 and a tower spring 13. The tower spring 13 presses the diaphragm 14 to achieve the valve closing function. During operation, the air intake pipe 8 is connected to the first molecular sieve bed 3 and disconnected from the second molecular sieve bed 3 by controlling the on / off state of the two solenoid valves 1. At the same time, the nitrogen exhaust pipe 6 is disconnected from the first molecular sieve bed 3 and connected to the second molecular sieve bed 3. At this time, the first molecular sieve bed 3 completes the oxygen production process, and the second molecular sieve bed 3 completes the nitrogen removal process. Some of the oxygen in the first molecular sieve bed 3 enters the second molecular sieve bed 3 for backflushing and nitrogen removal. Conversely, if the on / off state of the two solenoid valves 1 is changed, the first molecular sieve bed 3 completes the nitrogen removal process, and the second molecular sieve bed 3 completes the oxygen production process. Some of the oxygen in the second molecular sieve bed 3 enters the first molecular sieve bed 3 for backflushing and nitrogen removal.

[0004] The drawbacks of the aforementioned traditional two-bed molecular sieve oxygen generator are as follows: the entire oxygen generator has many scattered parts and pipelines, resulting in complex piping, numerous interfaces, poor airtightness, and reduced oxygen production efficiency; the one-way valve adopts a diaphragm + tower spring structure, which has the disadvantages of short diaphragm life and easy tilting and falling of the tower spring (after installation, the entire one-way valve is in a relatively closed state, so it is impossible to visually observe whether the tower spring has tilted), which can easily lead to one-way valve failure and malfunction; since the oxygen exhaust outlet occupies the central area of ​​the molecular sieve bed end face, the nitrogen backflushing interface can only be located at an off-center position on the molecular sieve bed end face. During oxygen backflushing, due to its off-center position, dead space may be generated, resulting in uneven backflushing and reduced backflushing effect. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated two-bed molecular sieve oxygen generator with fewer scattered components and pipelines and a high degree of integration in order to solve the above-mentioned problems.

[0006] The present invention achieves the above objectives through the following technical solutions:

[0007] An integrated two-bed molecular sieve oxygen generator includes a first molecular sieve bed, a second molecular sieve bed, and an oxygen tank. It also includes a base plate, a comprehensive switching seat, a first solenoid valve, a second solenoid valve, and a three-way valve assembly. The base plate has a first molecular sieve bed interface, a second molecular sieve bed interface, a first switching seat interface, and a second switching seat interface. The first molecular sieve bed interface and the first switching seat interface are connected via a channel within the base plate, and the second molecular sieve bed interface and the second switching seat interface are also connected via a channel within the base plate. The comprehensive switching seat has a first switching seat interface for communication with the first switching seat interface, a second switching seat interface for communication with the second switching seat interface, an air interface for connecting compressed air, and a nitrogen discharge interface for discharging nitrogen. The first solenoid valve is installed at one end of the comprehensive switching seat and is used to control the oxygen tank. The first interface of the switching seat is connected to the air interface and the nitrogen exhaust interface for opening and closing respectively. The second solenoid valve is installed at the other end of the integrated switching seat and is used to control the opening and closing of the second interface of the switching seat to the air interface and the nitrogen exhaust interface respectively. The vertical first molecular sieve bed, the vertical second molecular sieve bed, the oxygen tank and the integrated switching seat are respectively installed on the base plate. The first molecular sieve bed interface is connected to the lower end of the first molecular sieve bed, the second molecular sieve bed interface is connected to the lower end of the second molecular sieve bed, the first interface of the switching seat is connected to the first switching seat interface, and the second interface of the switching seat is connected to the second switching seat interface. The three interfaces of the three-way valve assembly are respectively connected to the oxygen outlet at the upper end of the first molecular sieve bed, the oxygen outlet at the upper end of the second molecular sieve bed and the air inlet of the oxygen tank. The internal structure of the above-mentioned integrated switching seat is similar to that of the traditional switching seat, except that a corresponding interface has been added. The connection structure with the first solenoid valve and the second solenoid valve is also consistent with the traditional corresponding structure. Therefore, the specific internal structure of the integrated switching seat and its specific connection structure with the first solenoid valve and the second solenoid valve are not described in detail. The integrated switching seat, the first solenoid valve and the second solenoid valve together form an integrated switching unit, which is equivalent to integrating two traditional independent switching seats and two solenoid valves into a whole component.

[0008] Preferably, to better achieve the one-way oxygen flow function, the three-way valve assembly includes a "T"-shaped three-way pipe and two one-way valve assemblies. The "T"-shaped three-way pipe is formed by connecting a straight pipe and a middle pipe. One end of the middle pipe is connected to the middle of the straight pipe. The two one-way valve assemblies are placed inside the straight pipe and are located on both sides of the middle pipe. The two ends of the straight pipe are connected to the oxygen outlet at the upper end of the first molecular sieve bed and the oxygen outlet at the upper end of the second molecular sieve bed, respectively. The other end of the middle pipe is connected to the air inlet of the oxygen tank.

[0009] Preferably, to achieve a more stable and reliable one-way valve function, the one-way valve assembly includes a connecting flange, a first sealing ring, a one-way valve body, a one-way valve core, a second sealing ring, a cylindrical helical compression spring, and a one-way valve retaining ring. The connecting flange is connected to the corresponding end of the straight pipe, and a first sealing ring is provided between the outer circumferential wall of one end of the connecting flange and the inner wall of the corresponding end of the straight pipe. The one-way valve body includes a valve body convex ring and a valve body cylinder that are connected to each other at both ends. The outer diameter of the valve body convex ring is larger than the outer diameter of the valve body cylinder, and the outer diameter of the valve body cylinder is smaller than the inner diameter of the straight pipe. The one-way valve body is placed inside the straight pipe, and the valve body convex ring is close to the connecting flange. Another first sealing ring is provided between the outer circumferential wall of the valve body convex ring and the inner wall of the straight pipe. An inner sealing ring is provided on the cylinder wall of the valve body cylinder near the valve body convex ring. The valve body has an external through-hole. The end of the valve body abuts against the one-way valve retainer, and the one-way valve retainer abuts against the corresponding annular step in the middle of the inner wall of the straight pipe. The cylindrical one-way valve core, which is open at one end and closed at the other, is placed inside the valve body. The closed end of the one-way valve core is close to the valve body convex ring. The length of the one-way valve core is less than the length of the valve body and greater than the corresponding width of the through-hole. A second sealing ring is provided on the outer circumference of the closed end of the one-way valve core. The second sealing ring can make close contact with the inner circumference of the valve body convex ring and the inner circumference of the valve body. A cylindrical helical compression spring is placed inside the one-way valve core, and its two ends are in contact with the closed end of the one-way valve core and the one-way valve retainer, respectively. A backflush air passage is provided inside the wall of the straight pipe. The two ends of the backflush air passage are connected to the central through holes of the two connecting flanges, respectively. The two first sealing rings mentioned above have the same diameter and are larger than the diameter of the second sealing ring, so the names "first sealing ring" and "second sealing ring" are used to distinguish them.

[0010] Preferably, in order to better achieve the blocking and positioning function of the one-way valve core, a retaining ring is provided on the inner circumference of the valve body protrusion ring at the position corresponding to the second sealing ring, which protrudes inward and is used to block the second sealing ring. The outer diameter of the outer circumference of the closed end of the one-way valve core is reduced to form an annular boss. The outer circumference of the annular boss is provided with a concave ring and the second sealing ring is placed in the concave ring.

[0011] Preferably, in order to prevent the cylindrical helical compression spring from separating from the one-way valve retaining ring, the one-way valve retaining ring is provided with a limiting groove for preventing the cylindrical helical compression spring from disengaging, and one end of the cylindrical helical compression spring is placed in the limiting groove.

[0012] Preferably, to further improve the performance and service life of the one-way valve assembly, the one-way valve core is a polyetheretherketone (PEEK) valve core. PEEK has a self-lubricating effect, which facilitates the smooth sliding of the one-way valve core, and it also has excellent high and low temperature resistance, which helps to improve its service life.

[0013] Preferably, to facilitate the installation of the first sealing ring, annular grooves are provided on the outer circumferential wall of the connecting flange and the outer circumferential wall of the valve body convex ring, and the two first sealing rings are respectively placed in the two annular grooves.

[0014] Preferably, in order to improve safety and reduce nitrogen exhaust noise, the air interface of the integrated switching base is equipped with a safety valve, the air interface of the integrated switching base is connected to an air filter, and the nitrogen exhaust interface of the integrated switching base is connected to a silencer.

[0015] Preferably, in order to reduce the nitrogen removal impact between the first molecular sieve bed and the second molecular sieve bed, the nitrogen removal interface of the integrated switching seat is provided with a partition in the middle to form a first nitrogen removal cavity and a second nitrogen removal cavity. The first interface of the switching seat can communicate with the first nitrogen removal cavity, and the second interface of the switching seat can communicate with the second nitrogen removal cavity.

[0016] The beneficial effects of this invention are as follows:

[0017] This invention effectively integrates multiple scattered components in traditional structures and eliminates multiple pipelines by designing a first molecular sieve bed, a second molecular sieve bed, an oxygen tank, a base plate, a comprehensive switching seat, a first solenoid valve, a second solenoid valve, and a three-way valve assembly that cooperate with each other. This greatly simplifies the system's gas path, improves system integration and modularity, reduces interfaces, and enhances airtightness, reliability, and oxygen production efficiency. The three-way valve assembly is formed by assembling a "T"-shaped three-way pipe and two one-way valve assemblies. The one-way valve assembly, composed of a connecting flange, a first sealing ring, a one-way valve body, a one-way valve core, a second sealing ring, a cylindrical helical compression spring, and a one-way valve retaining ring, avoids the problems of short diaphragm life and easy tilting and tipping of traditional tower-shaped springs. This makes the one-way valve assembly more stable, reliable, and has a longer service life. Furthermore, a backflush airway is set inside the wall of the straight pipe, merging the air inlet, nitrogen outlet, and backflush port on the molecular sieve bed into one central area. This prevents dead space during oxygen backflush, resulting in more uniform backflush, enhanced backflush effect, and oxygen savings. Attached Figure Description

[0018] Figure 1 This is a 3D diagram of a traditional two-bed molecular sieve oxygen generator;

[0019] Figure 2 This is a bottom view of a traditional two-bed molecular sieve oxygen generator;

[0020] Figure 3 This is a bottom view of the end cap, one-way valve, and nitrogen backflush port of one of the molecular sieve beds in a traditional two-bed molecular sieve oxygen generator.

[0021] Figure 4 yes Figure 3 AA section view in the middle;

[0022] Figure 5 This is a three-dimensional exploded view of the integrated two-bed molecular sieve oxygen generator described in this invention before assembly;

[0023] Figure 6 This is a three-dimensional view of the integrated two-bed molecular sieve oxygen generator assembled according to the present invention;

[0024] Figure 7 This is a perspective view of the three-way valve assembly of the integrated two-bed molecular sieve oxygen generator described in this invention before assembly. Only a perspective exploded view of a one-way valve assembly before assembly is shown in the figure.

[0025] Figure 8 This is a front sectional view of the three-way valve assembly of the integrated two-bed molecular sieve oxygen generator described in this invention after assembly;

[0026] Figure 9 This is a top sectional view of the integrated two-bed molecular sieve oxygen generator of the present invention after the assembly of the integrated switching seat, the first solenoid valve and the second solenoid valve. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings:

[0028] like Figures 5-9As shown, the integrated two-bed molecular sieve oxygen generator of the present invention includes a first molecular sieve bed 17, a second molecular sieve bed 20, an oxygen tank 15, a base plate 16, a comprehensive switching seat 27, a first solenoid valve 26, a second solenoid valve 29, and a three-way valve assembly 18. The base plate 16 is provided with a first molecular sieve bed interface 19, a second molecular sieve bed interface 21, a first switching seat interface 22, and a second switching seat interface 23. The first molecular sieve bed interface 19 and the first switching seat interface 22 are connected through a channel (not visible in the figure) provided in the base plate 16, and the second molecular sieve bed interface 21 and the second switching seat interface 23 are connected through a channel (not visible in the figure) provided in the base plate. The comprehensive switching seat 27 is provided with a first switching seat interface 42 for communication with the first switching seat interface 22, a second switching seat interface 43 for communication with the second switching seat interface 23, an air interface 41 for external compressed air connection, and a nitrogen discharge interface for discharging nitrogen (refer to the first nitrogen discharge cavity 45 in the following description). The second nitrogen venting chamber 46) has a first solenoid valve 26 installed at one end of the integrated switching seat 27 and used to control the opening and closing of the first interface 42 of the switching seat with the air interface 41 and the nitrogen venting interface respectively. The second solenoid valve 29 is installed at the other end of the integrated switching seat 27 and used to control the opening and closing of the second interface 43 of the switching seat with the air interface 41 and the nitrogen venting interface respectively. The vertical first molecular sieve bed 17, the vertical second molecular sieve bed 20, the oxygen tank 15 and the integrated switching seat 27 are respectively installed on the base plate 16. The first molecular sieve bed interface 19 is connected to the lower end of the first molecular sieve bed 17, the second molecular sieve bed interface 21 is connected to the lower end of the second molecular sieve bed 20, the first interface 42 of the switching seat is connected to the first switching seat interface 22, the second interface 43 of the switching seat is connected to the second switching seat interface 23, and the three interfaces of the three-way valve assembly 18 are respectively connected to the oxygen outlet at the upper end of the first molecular sieve bed 17, the oxygen outlet at the upper end of the second molecular sieve bed 20 and the air inlet of the oxygen tank 15.

[0029] like Figures 5-9 As shown, the present invention also discloses the following more optimized specific structures:

[0030] To better achieve the one-way oxygen flow function, the three-way valve assembly 18 includes a "T"-shaped three-way pipe (not separately marked, refer to the indicator line of the three-way valve assembly 18) and two one-way valve assemblies. The "T"-shaped three-way pipe is formed by connecting a straight pipe 39 and a middle pipe (not separately marked). One end of the middle pipe is connected to the middle of the straight pipe 39. The two one-way valve assemblies are placed inside the straight pipe 39 and are located on both sides of the middle pipe. The two ends of the straight pipe 39 are connected to the oxygen outlet at the upper end of the first molecular sieve bed 17 and the oxygen outlet at the upper end of the second molecular sieve bed 20, respectively. The other end of the middle pipe is connected to the air inlet of the oxygen tank 15.

[0031] To achieve a more stable and reliable one-way valve function, the one-way valve assembly includes a connecting flange 30, a first sealing ring 31, a one-way valve body 32, a one-way valve core 36, a second sealing ring 35, a cylindrical helical compression spring 37, and a one-way valve retaining ring 38. The connecting flange 30 is connected to the corresponding end of the straight pipe 39, and a first sealing ring 31 is provided between the outer circumferential wall of one end of the connecting flange 30 and the inner wall of the corresponding end of the straight pipe 39. The one-way valve body 32 includes a valve body protrusion ring (not separately marked in the figure) and a valve body cylinder 34 that are connected to each other and have two through ends. The outer diameter of the valve body protrusion ring is larger than the outer diameter of the valve body cylinder 34, and the outer diameter of the valve body cylinder 34 is smaller than the inner diameter of the straight pipe 39. The one-way valve body 32 is placed inside the straight pipe 39, and the valve body protrusion ring is close to the connecting flange 30. Another first sealing ring 31 is provided between the outer circumferential wall of the valve body protrusion ring and the inner wall of the straight pipe 39. The valve body cylinder 34 has a first sealing ring 31 on its cylinder wall near the valve body protrusion ring. The ring has a through hole 33 that extends through both the inside and outside of the cylinder. The end of the valve body cylinder 34 abuts against the one-way valve retaining ring 38, and the one-way valve retaining ring 38 abuts against the corresponding annular step in the middle of the inner wall of the straight pipe 39. A cylindrical one-way valve core 36, open at one end and closed at the other, is placed inside the valve body cylinder 34, with the closed end of the one-way valve core 36 close to the valve body protrusion ring. The length of the one-way valve core 36 is less than the length of the valve body cylinder 34 but greater than the corresponding width of the through hole 33. The second sealing ring 35 is provided on the outer circumference of the closed end of 36. The second sealing ring 35 can be in close contact with the inner circumference of the valve body protrusion ring and the inner circumference of the valve body cylinder 34. The cylindrical helical compression spring 37 is placed inside the one-way valve core 36 and its two ends are in contact with the closed end of the one-way valve core 36 and the one-way valve retainer ring 38, respectively. The straight pipe 39 is provided with a backflush air passage 40 inside the pipe wall. The two ends of the backflush air passage 40 are respectively connected to the central through holes of the two connecting flanges 30.

[0032] In order to better achieve the blocking and positioning function of the one-way valve core 36, the inner circumferential wall of the valve body protrusion ring is provided with an inward protrusion for blocking the second sealing ring 35 at the position corresponding to the second sealing ring 35. The outer diameter of the outer circumferential wall of the closed end of the one-way valve core 36 is reduced to form an annular boss. The outer circumferential wall of the annular boss is provided with a concave ring and the second sealing ring 35 is placed in the concave ring.

[0033] To prevent the cylindrical helical spring 37 from separating from the one-way valve retaining ring 38, the one-way valve retaining ring 38 is provided with a limiting groove to prevent the cylindrical helical spring 37 from disengaging, and one end of the cylindrical helical spring 37 is placed in the limiting groove.

[0034] To further improve the performance and service life of the one-way valve assembly, the one-way valve core 36 is a polyetheretherketone (PEEK) valve core. PEEK has a self-lubricating effect, which facilitates the smooth sliding of the one-way valve core 36, and it also has excellent high and low temperature resistance, which helps to improve its service life.

[0035] To facilitate the installation of the first sealing ring 31, annular grooves are provided on the outer circumference of the connecting flange 30 and the outer circumference of the valve body convex ring, and the two first sealing rings 31 are respectively placed in the two annular grooves.

[0036] To improve safety and reduce nitrogen exhaust noise, a safety valve 25 is installed in the air interface 41 of the integrated switching base 27. The air interface 41 of the integrated switching base 27 is connected to the air filter 24, and the nitrogen exhaust interface of the integrated switching base 27 is connected to the silencer 28.

[0037] In order to reduce the nitrogen removal effect between the first molecular sieve bed 17 and the second molecular sieve bed 20, a partition 44 is provided in the middle of the nitrogen removal interface of the integrated switching seat 27 to form a first nitrogen removal cavity 45 and a second nitrogen removal cavity 46. The first interface 42 of the switching seat can communicate with the first nitrogen removal cavity 45, and the second interface 43 of the switching seat can communicate with the second nitrogen removal cavity 46.

[0038] like Figures 5-9 As shown, in application, the air filter 24 is connected to the air compressor (not shown in the figure); taking the oxygen production process of the first molecular sieve bed 17 and the nitrogen removal process of the second molecular sieve bed 20 as an example, the first solenoid valve 26 is energized and the second solenoid valve 29 is de-energized. At this time, the first interface 42 of the switching seat is connected to the air interface 41 and disconnected from the first nitrogen removal cavity 45, and the second interface 43 of the switching seat is disconnected from the air interface 41 and connected to the second nitrogen removal cavity 46. Compressed air enters the integrated switching seat 27 through the air filter 24, and enters the first molecular sieve bed 17 after passing through the air interface 41, the first interface 42, and the first switching seat interface 22 of the integrated switching seat 27 in sequence. The nitrogen in the air is adsorbed, and the oxygen enters the corresponding end of the straight pipe 39 of the "T"-shaped three-way pipe of the three-way valve assembly from the oxygen outlet at the upper end of the first molecular sieve bed 17 (e.g., Figure 8As shown, oxygen pressure pushes the one-way valve core 36 to overcome the pressure of the cylindrical helical spring 37 and move towards the one-way valve retaining ring 38, opening the one-way valve assembly. The other one-way valve assembly is in the closed state. Oxygen passes through the corresponding valve body protrusion ring, the cylinder through hole 33 on the valve body cylinder 34, the gap between the outer wall of the valve body cylinder 34 and the inner wall of the straight pipe 39, and the middle pipe of the "T" shaped three-way pipe into the oxygen tank 15, realizing the oxygen production process of the first molecular sieve bed 17. At the same time, some oxygen enters the upper end of the second molecular sieve bed 20 through the backflush air passage 40 and flows downward from the central area, blowing out the nitrogen in the second molecular sieve bed 20. After being blown out from the lower end of the second molecular sieve bed 20, the nitrogen passes through the second switching seat interface 23, the second switching seat interface 43, the second nitrogen discharge cavity 46 and the silencer 28 in sequence before being discharged into the air, realizing the backflush nitrogen discharge process of the second molecular sieve bed 20. Conversely, by de-energizing the first solenoid valve 26 and energizing the second solenoid valve 29, the backflushing nitrogen removal process of the first molecular sieve bed 17 and the oxygen production process of the second molecular sieve bed 20 can be realized. By repeating this cycle, continuous oxygen production can be achieved.

[0039] The above embodiments are merely preferred embodiments of the present invention and are not intended to limit the technical solutions of the present invention. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of the patent of the present invention.

Claims

1. An integrated two-bed molecular sieve oxygen generator, comprising a first molecular sieve bed, a second molecular sieve bed, and an oxygen tank, characterized in that: It also includes a base plate, a comprehensive switching seat, a first solenoid valve, a second solenoid valve, and a three-way valve assembly. The base plate has a first molecular sieve bed interface, a second molecular sieve bed interface, a first switching seat interface, and a second switching seat interface. The first molecular sieve bed interface and the first switching seat interface are connected through a channel within the base plate, and the second molecular sieve bed interface and the second switching seat interface are also connected through a channel within the base plate. The comprehensive switching seat has a first switching seat interface for communication with the first switching seat interface, a second switching seat interface for communication with the second switching seat interface, an air interface for connecting compressed air, and a nitrogen discharge interface for discharging nitrogen. The first solenoid valve is installed at one end of the comprehensive switching seat and controls the opening and closing of the first switching seat interface with both the air interface and the nitrogen discharge interface. The second solenoid valve is installed at the other end of the comprehensive switching seat and controls the opening and closing of the second switching seat interface with both the air interface and the nitrogen discharge interface. The first molecular sieve bed is vertically oriented, and the... The second molecular sieve bed, the oxygen tank, and the integrated switching seat are respectively installed on the base plate. The first molecular sieve bed interface is connected to the lower end of the first molecular sieve bed, and the second molecular sieve bed interface is connected to the lower end of the second molecular sieve bed. The first interface of the switching seat is connected to the first switching seat interface, and the second interface of the switching seat is connected to the second switching seat interface. The three interfaces of the three-way valve assembly are respectively connected to the oxygen outlet at the upper end of the first molecular sieve bed, the oxygen outlet at the upper end of the second molecular sieve bed, and the air inlet of the oxygen tank. The three-way valve assembly includes a "T"-shaped three-way pipe and two one-way valve assemblies. The "T"-shaped three-way pipe is formed by connecting a straight pipe and a middle pipe. One end of the middle pipe is connected to the middle of the straight pipe. The two one-way valve assemblies are placed inside the straight pipe and are located on both sides of the middle pipe. The two ends of the straight pipe are respectively connected to the oxygen outlet at the upper end of the first molecular sieve bed and the oxygen outlet at the upper end of the second molecular sieve bed. The other end of the middle pipe is connected to the air inlet of the oxygen tank.The one-way valve assembly includes a connecting flange, a first sealing ring, a one-way valve body, a one-way valve core, a second sealing ring, a cylindrical helical compression spring, and a one-way valve retaining ring. The connecting flange is connected to the corresponding end of the straight pipe, and a first sealing ring is provided between the outer circumferential wall of one end of the connecting flange and the inner wall of the corresponding end of the straight pipe. The one-way valve body includes a valve body convex ring and a valve body cylinder that are connected to each other at both ends. The outer diameter of the valve body convex ring is larger than the outer diameter of the valve body cylinder, and the outer diameter of the valve body cylinder is smaller than the inner diameter of the straight pipe. The one-way valve body is placed inside the straight pipe, and the valve body convex ring is close to the connecting flange. Another first sealing ring is provided between the outer circumferential wall of the valve body convex ring and the inner wall of the straight pipe. A through hole is provided on the cylinder wall of the valve body cylinder near the valve body convex ring. The end of the valve body cylinder abuts against the one-way valve retaining ring, and the one-way valve retaining ring abuts against the corresponding annular step in the middle of the inner wall of the straight pipe. A cylindrical one-way valve core, open at one end and closed at the other, is placed inside the valve body cylinder, with its closed end close to the valve body convex ring. The length of the one-way valve core is less than the length of the valve body cylinder but greater than the corresponding width of the cylinder's through hole. A second sealing ring is provided on the outer circumference of the closed end of the one-way valve core, allowing it to tightly contact the inner circumference of the valve body convex ring and the inner circumference of the valve body cylinder. A cylindrical helical compression spring is placed inside the one-way valve core, with its two ends contacting the closed end of the one-way valve core and the one-way valve retaining ring, respectively. A backflush air passage is provided inside the straight pipe wall, with both ends of the backflush air passage communicating with the central through holes of the two connecting flanges, respectively.

2. The integrated two-bed molecular sieve oxygen generator according to claim 1, characterized in that: The valve body convex ring has an inwardly protruding retaining ring on its inner circumference, corresponding to the position of the second sealing ring, which is used to block the second sealing ring. The outer diameter of the outer circumference of the closed end of the one-way valve core is reduced to form an annular boss. The outer circumference of the annular boss has a concave ring, and the second sealing ring is placed in the concave ring.

3. The integrated two-bed molecular sieve oxygen generator according to claim 1, characterized in that: The one-way valve retaining ring is provided with a limiting groove to prevent the cylindrical helical spring from disengaging, and one end of the cylindrical helical spring is placed in the limiting groove.

4. The integrated two-bed molecular sieve oxygen generator according to claim 1, characterized in that: The one-way valve core is a polyetheretherketone (PEEK) valve core.

5. The integrated two-bed molecular sieve oxygen generator according to claim 1, characterized in that: The outer circumferential wall of the connecting flange and the outer circumferential wall of the valve body protrusion ring are respectively provided with annular grooves, and the two first sealing rings are respectively placed in the two annular grooves.

6. The integrated two-bed molecular sieve oxygen generator according to any one of claims 1-4, characterized in that: The integrated switching base has a safety valve installed in its air interface, the air interface of the integrated switching base is connected to an air filter, and the nitrogen venting interface of the integrated switching base is connected to a silencer.

7. The integrated two-bed molecular sieve oxygen generator according to any one of claims 1-4, characterized in that: The nitrogen venting interface of the integrated switching seat is provided with a partition in the middle to form a first nitrogen venting cavity and a second nitrogen venting cavity. The first interface of the switching seat can communicate with the first nitrogen venting cavity, and the second interface of the switching seat can communicate with the second nitrogen venting cavity.

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