Multi-channel airflow distribution rotary valve applied to molecular sieve oxygen production bottom valve and overhead valve combination

Abstract

The invention discloses a multi-channel airflow distribution rotary valve applied to a molecular sieve oxygen generation bottom valve and overhead valve combination, and belongs to the technical field of airflow switching rotary valves. The top valve and the bottom valve are vertically arranged and installed on the fixing frame, a first valve cavity is formed in the top valve, and a second valve cavity is formed in the bottom valve; the bottom valve is provided with an air inlet communicated with the second valve cavity; the overhead valve and the bottom valve are communicated with the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D; the first control mechanism and the second control mechanism are arranged in the first valve cavity and the second valve cavity respectively; and the driving part is located between the bottom valve and the top valve, the first end of the driving part is in driving connection with the first control mechanism, and the second end is in driving connection with the second control mechanism. The bottom valve is mainly used for air intake and desorption; the overhead valve is mainly used for oxygen outlet and air outlet end pressure equalizing, the driving part drives the first control mechanism and the second control mechanism to rotate, cost is low, performance is stable, the system integration degree is high, and stability is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of airflow switching rotary valves, and in particular relates to a multi-channel airflow distribution rotary valve combined with a bottom valve and a top valve for molecular sieve oxygen production. Background Art

[0002] Pressure swing adsorption (PSA) oxygen production equipment is an automated equipment that uses zeolite molecular sieve as adsorbent, and uses the principle of pressurized adsorption and decompression desorption to adsorb and release nitrogen from the air, thereby separating oxygen. Zeolite molecular sieve is a spherical granular adsorbent with micropores on the surface and inside, which is processed by a special pore treatment process and is white. Its pore characteristics enable it to achieve kinetic separation of O2 and N2. The separation effect of zeolite molecular sieve on O2 and N2 is based on the slight difference in the kinetic diameters of the two gases. N2 molecules have a faster diffusion rate in the micropores of zeolite molecular sieves, while O2 molecules have a slow diffusion rate. The diffusion of water and CO2 in compressed air is not much different from that of nitrogen. In the end, oxygen molecules are enriched from the adsorption tower. The principle of pressure swing adsorption utilizes the selective adsorption characteristics of zeolite molecular sieves, and adopts a cycle of pressurized adsorption and decompression desorption to allow compressed air to alternately enter the adsorption tower to achieve air separation, thereby continuously producing high-purity product oxygen.

[0003] Since the traditional pressure swing adsorption oxygen production system adopts a two-tower process flow, when the oxygen production output is large, the diameter and height of the adsorption tower are large, and due to the limitations of the process flow, the oxygen production performance is low and the energy consumption is high. In order to improve the oxygen production performance and the integration of equipment, a multi-tower adsorption bed structure has gradually been proposed for use in pressure swing adsorption oxygen production equipment. The PSA oxygen production equipment with a multi-tower adsorption bed structure can significantly improve the oxygen recovery performance through multiple pressure equalization and rapid cycles, and has obvious advantages over the traditional two-tower PSA oxygen production equipment. The airflow switching valve is the core component of the adsorption separation equipment. The traditional multi-tower PSA oxygen production equipment usually uses a combination of multiple solenoid valves and pneumatic valves to achieve airflow switching control, which has a complex structure, high equipment cost and high failure rate.

[0004] Therefore, it is particularly important to use a multi-channel rotary valve to switch the gas path to achieve the effect of oxygen production. The core components of the rotary valve are disc-shaped moving valve plates and static valve plates. The working end surface of the moving valve plate is provided with an air inlet groove and a desorption groove, and the working end surface of the static valve plate is provided with multiple through holes connected to the adsorption tower. As the rotating shaft drives the moving valve plate to rotate, the working end surfaces of the moving and static valve plates fit together to complete the gas path switching, thereby realizing the adsorption and desorption cycle steps in the pressure swing adsorption process and completing the multi-tower PSA separation oxygen production process. At present, most of them use a combination of a single moving valve plate and a single static valve plate to produce oxygen. The adsorption, desorption and other processes are only carried out at one position, resulting in low oxygen production efficiency and low system integration. In addition, the current small PSA oxygen generators are all driven by motors, and the performance is unstable. Summary of the invention

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] A multi-channel air flow distribution rotary valve for molecular sieve oxygen production with a bottom valve and a top valve combination, comprising:

[0007] Fixed frame;

[0008] A top valve and a bottom valve are arranged up and down and mounted on the fixing frame, wherein the top valve has a first valve cavity therein, and the bottom valve has a second valve cavity therein; an air inlet connected to the second valve cavity is arranged on one side of the bottom valve; the top valve is provided with four air inlet pipes and one oxygen outlet pipe connected to the first valve cavity, and the four air inlet pipes are connected to the air outlet ends of adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D in a one-to-one correspondence; the bottom valve is provided with four connecting pipes and one nitrogen exhaust pipe connected to the second valve cavity, and the four connecting pipes are connected to the inlets of adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D in a one-to-one correspondence;

[0009] a first control mechanism and a second control mechanism, wherein the first control mechanism is disposed in the first valve cavity, and the second control mechanism is disposed in the second valve cavity;

[0010] A driving part, wherein the driving part is located between the bottom valve and the top valve, a first end of the driving part is drivingly connected to the first control mechanism in the first valve cavity, and a second end of the driving part is drivingly connected to the second control mechanism in the second valve cavity;

[0011] Among them, air enters the second valve chamber through the air inlet of the bottom valve, and the driving unit drives the first control mechanism and the second control mechanism to rotate synchronously; the driving unit drives the first control mechanism and the second control mechanism to rotate, so that the adsorption tower A performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, and the adsorption tower B performs pressure reduction, backblowing, pressure equalization and adsorption processes in sequence, the adsorption tower C performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, and the adsorption tower D performs pressure equalization, adsorption, pressure reduction and backblowing processes in sequence. At this point, the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D have undergone a pressure swing adsorption cycle to achieve air separation and oxygen production.

[0012] Furthermore, the first control mechanism comprises a top valve static valve plate and a top valve dynamic valve plate located in the first valve cavity and arranged opposite to each other up and down;

[0013] Among them, 4 second through holes and 4 third through holes are evenly distributed along the circumferential direction on the static valve plate of the top valve, wherein the diameter of the pitch circle where the centers of the 4 second through holes are located is greater than the diameter of the pitch circle where the centers of the 4 third through holes are located, and the pitch circle where the centers of the 4 second through holes are located is concentric with the pitch circle where the centers of the 4 third through holes are located; one second through hole and one third through hole are a group; an oxygen outlet hole is provided on the static valve plate of the top valve, and the oxygen outlet hole is provided between two adjacent second through holes;

[0014] An annular connecting groove is provided on the movable valve plate of the top valve, and a strip-shaped pressure equalizing groove is provided at the center of the movable valve plate of the top valve, and the connecting groove is sleeved on the outside of the pressure equalizing groove; the pressure equalizing groove is used to connect the two opposite third through holes on the static valve plate of the top valve, so as to perform a pressure equalization process for the adsorption tower B and the adsorption tower C, or the adsorption tower A and the adsorption tower D; the connecting groove is used to connect the second through hole and the oxygen outlet hole on the static valve plate of the top valve;

[0015] The first end of the driving part is drivingly connected to the movable valve plate of the top valve.

[0016] Furthermore, the second control mechanism comprises a bottom valve movable valve plate and a bottom valve static valve plate located in the second valve cavity and arranged opposite to each other up and down;

[0017] Wherein, a plurality of air inlet holes are arranged in a circumferential direction on the bottom valve movable valve plate; an elliptical desorption groove is arranged on the bottom valve movable valve plate in a symmetrical direction of the plurality of air inlet holes, and an arc-shaped beam is arranged in the desorption groove to divide the desorption groove into two parts, an upper and a lower part; an analytical blind hole is arranged at the center position of the circle of the bottom valve movable valve plate, and three connecting holes are arranged inside the desorption groove, and the three connecting holes are connected to the analytical blind hole;

[0018] The bottom valve static valve plate is provided with two groups of first through holes along the circumferential direction, wherein four first through holes are the first group, and the other four first through holes are the second group; the four first through holes of the first group are provided correspondingly to the four first through holes of the second group; the pitch circle where the center of the first through holes of the first group is located is concentric with the pitch circle where the center of the first through holes of the second group is located, and the diameter of the pitch circle where the center of the first through holes of the first group is located is greater than the diameter of the pitch circle where the center of the first through holes of the second group is located; the first through holes of the first group and the corresponding first through holes of the second group are a group, forming four groups, and are respectively provided correspondingly to the four connecting pipes;

[0019] The second end of the driving part is drivingly connected to the movable valve plate of the bottom valve.

[0020] Furthermore, the driving unit comprises:

[0021] A transmission shaft, wherein the transmission shaft is located between the bottom valve and the top valve, one end of the transmission shaft extends into the first valve cavity of the top valve and is fixedly connected to the movable valve plate of the top valve; the other end of the transmission shaft extends into the second valve cavity of the bottom valve and is fixedly connected to the movable valve plate of the bottom valve;

[0022] A ratchet and a pawl, wherein the ratchet is fixedly connected to the transmission shaft; and the pawl is arranged on the fixing frame;

[0023] a cylinder, wherein a driving end of the cylinder is drivingly connected to a tooth of the ratchet wheel;

[0024] The cylinder pushes the ratchet wheel and drives the transmission shaft to rotate unidirectionally around the central axis of the transmission shaft, thereby driving the bottom valve movable valve plate and the top valve movable valve plate to rotate.

[0025] Furthermore, a bottom valve upper cover plate is also provided in the second valve cavity of the bottom valve. The bottom valve upper cover plate is located on a side of the bottom valve movable valve plate away from the bottom valve static valve plate and is fixedly connected to the bottom valve movable valve plate.

[0026] Furthermore, a second compression spring is arranged in the second valve cavity of the bottom valve, and the second compression spring is arranged between the upper cover plate of the bottom valve and the inner wall of the second valve cavity.

[0027] Furthermore, the bottom valve is provided with a bottom valve connecting sleeve connected to a pipeline, and the bottom valve connecting sleeve is provided with the same hole as that of the static valve plate of the bottom valve.

[0028] Furthermore, a top valve upper cover plate is also provided in the first valve cavity of the top valve. The top valve upper cover plate is located on a side of the top valve movable valve plate away from the top valve static valve plate and is fixedly connected to the top valve movable valve plate.

[0029] Further, a first compression spring is arranged in the first valve cavity of the top valve, and the first compression spring is arranged between the top valve upper cover plate and the inner wall of the first valve cavity.

[0030] Furthermore, the top valve is provided with a top valve oxygen outlet plate connected to the pipeline, and the top valve oxygen outlet plate is provided with holes that are the same as those of the static valve plate of the top valve.

[0031] Beneficial effects:

[0032] In the multi-channel airflow distribution rotary valve of the bottom valve and top valve combination for molecular sieve oxygen production provided by the present invention, the bottom valve is mainly used for air intake and desorption; the top valve is mainly used for oxygen outlet and air outlet pressure equalization, the rotating shaft drives the movable valve plates in the bottom valve and the top valve to rotate, and the rotation is achieved by the cylinder pushing the ratchet wheel, which has low cost, stable performance, high system integration and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0034] Figure 2 It is a front view of the present invention;

[0035] Figure 3 for Figure 2 Middle AA section view;

[0036] Figure 4 It is a schematic diagram of the three-dimensional structure of the movable valve plate of the bottom valve;

[0037] Figure 5 Another view of the bottom valve moving disc;

[0038] Figure 6 It is a schematic diagram of the three-dimensional structure of the static valve plate of the bottom valve;

[0039] Figure 7 It is a schematic diagram of the three-dimensional structure of the movable valve plate of the top valve;

[0040] Figure 8 It is a schematic diagram of the three-dimensional structure of the static valve plate of the top valve;

[0041] Fig. 9 A schematic diagram of the connection between the multi-channel airflow distribution rotary valve combined with the bottom valve and the top valve for molecular sieve oxygen production provided by the present invention and four adsorption towers;

[0042] Among them, 1. cylinder; 2. ratchet; 3. rotary valve fixing frame; 4. bottom valve; 5. top valve; 61. first valve chamber; 62. second valve chamber; 7. air inlet; 8. bottom valve upper cover plate; 9. bottom valve movable valve plate; 10. bottom valve static valve plate; 11. air inlet through hole; 12. desorption groove; 13. desorption blind hole; 14. connecting hole; 15. first through hole; 16. desorption hole; 17. top valve upper cover plate; 18. top valve movable valve plate; 19. top valve static valve plate; 20. connecting groove; 21. equalizing groove; 22. second through hole; 23. third through hole; 24. oxygen outlet hole; 25. top valve oxygen outlet plate; 26. bottom valve connecting sleeve; 271. first compression spring; 272. second compression spring; 28. transmission shaft; 29. ​​oxygen outlet pipe; 30. nitrogen exhaust pipe; 31. connecting pipe; 32. air inlet pipe. DETAILED DESCRIPTION

[0043] Example 1

[0044] refer to Figure 1-9 , a multi-channel air flow distribution rotary valve combined with a bottom valve and a top valve for molecular sieve oxygen production, comprising:

[0045] Fixed frame 3;

[0046] A top valve 5 and a bottom valve 4 are arranged up and down and mounted on a fixing frame 3, wherein the top valve 5 has a first valve cavity 61 therein, and the bottom valve 4 has a second valve cavity 62 therein; an air inlet 7 communicating with the second valve cavity 62 is arranged on one side of the bottom valve 4; the top valve 5 is provided with four air inlet pipes 32 and one oxygen outlet pipe 29 communicating with the first valve cavity 61, and the four air inlet pipes 32 are connected and arranged correspondingly to the air outlet ends of adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D; the bottom valve 4 is provided with four connecting pipes 31 and one communicating with the second valve cavity 62, and the four connecting pipes 31 are connected and arranged correspondingly to the inlets of adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D; wherein the nitrogen exhaust pipe 30 is connected to the desorption silencer;

[0047] A first control mechanism and a second control mechanism, the first control mechanism is arranged in the first valve chamber 61, and the second control mechanism is arranged in the second valve chamber 62;

[0048] A driving part, the driving part is located between the bottom valve 4 and the top valve 5, a first end of the driving part is drivingly connected to a first control mechanism in the first valve cavity 61, and a second end of the driving part is drivingly connected to a second control mechanism in the second valve cavity 62;

[0049] Among them, air enters the second valve chamber 62 through the air inlet 7 of the bottom valve 4, and the driving unit drives the first control mechanism and the second control mechanism to rotate synchronously; the driving unit drives the first control mechanism and the second control mechanism to rotate, so that the adsorption tower A performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, and the adsorption tower B performs pressure reduction, backblowing, pressure equalization and adsorption processes in sequence, the adsorption tower C performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, and the adsorption tower D performs pressure equalization, adsorption, pressure reduction and backblowing processes in sequence. At this point, the adsorption towers A, B, C and D have undergone a pressure swing adsorption cycle to achieve air separation and oxygen production.

[0050] In this embodiment, the first control mechanism includes a top valve static valve disc 19 and a top valve dynamic valve disc 18 which are located in the first valve cavity 61 and are arranged opposite to each other up and down;

[0051] Among them, four second through holes 22 and four third through holes 23 are evenly arranged along the circumferential direction on the static valve plate 19 of the top valve, wherein the diameter of the pitch circle where the center of the four second through holes 22 is located is greater than the diameter of the pitch circle where the center of the four third through holes 23 is located, and the pitch circle where the center of the four second through holes 22 is located is concentric with the pitch circle where the center of the four third through holes 23 is located; one second through hole 22 and one third through hole 23 form a group; an oxygen outlet hole 24 is provided on the static valve plate 19 of the top valve, and the oxygen outlet hole 24 is arranged between two adjacent second through holes 22; wherein the oxygen outlet pipe 29 is installed on the oxygen outlet hole 24;

[0052] An annular connecting groove 20 is provided on the top valve movable valve plate 18, and a strip-shaped pressure equalizing groove 21 is provided in the center of the top valve movable valve plate 18, and the connecting groove 20 is sleeved on the outside of the pressure equalizing groove 21; the pressure equalizing groove 21 is used to connect the two opposite third through holes 23 on the top valve static valve plate 19, and is used to perform a pressure equalization process for the adsorption tower B and the adsorption tower C, or the adsorption tower A and the adsorption tower D; the connecting groove 20 is used to connect the second through hole 22 and the oxygen outlet hole 24 on the top valve static valve plate 19;

[0053] The first end of the driving part is drivingly connected to the top valve movable valve plate 18 .

[0054] Specifically, the pressure equalizing groove 21 is a strip-shaped hole with long arcs and flattened edges on the left and right sides.

[0055] In this embodiment, the second control mechanism includes a bottom valve movable valve disc 9 and a bottom valve static valve disc 10 which are located in the second valve chamber 62 and are arranged opposite to each other up and down;

[0056] Among them, a plurality of air intake holes 11 are arranged in a circumferential direction on the bottom valve movable valve plate 9; an elliptical desorption groove 12 is provided on the bottom valve movable valve plate 9 in a symmetrical direction of the plurality of air intake holes 11, and an arc-shaped beam is provided in the desorption groove 12 to divide the desorption groove 12 into two parts, an upper and lower part; an analytical blind hole 13 is provided at the center position of the bottom valve movable valve plate 9, and three communicating holes 14 are provided inside the desorption groove 12, and the three communicating holes 14 are connected to the analytical blind hole 13;

[0057] Specifically, four air intake holes 11 are arranged on the bottom valve movable valve plate 9 along the circumferential direction, three air intake holes 11 are arranged in the direction close to the center of the bottom valve movable valve plate 9, and a total of seven air intake holes 11 are arranged.

[0058] In this embodiment, the desorption tank 12 is an elliptical channel, and is divided into two parts, an upper part and a lower part, by an arc beam.

[0059] The desorption groove 12 on the bottom valve movable valve plate 9 is elliptical, which reduces the impact of the gas on the bottom valve movable valve plate 9.

[0060] The bottom valve static valve plate 10 is evenly arranged with two groups of first through holes 15 along the circumferential direction, wherein four first through holes 15 are in the first group, and the other four first through holes 15 are in the second group; the four first through holes 15 in the first group are arranged correspondingly to the four first through holes 15 in the second group; the pitch circle where the center of the first through holes 15 in the first group is located is concentric with the pitch circle where the center of the first through holes 15 in the second group is located, and the diameter of the pitch circle where the center of the first through holes 15 in the first group is located is greater than the diameter of the pitch circle where the center of the first through holes 15 in the second group is located; the first through holes 15 in the first group and the corresponding first through holes 15 in the second group are grouped together to form four groups, and are respectively arranged correspondingly to four connecting pipes 31, and the four connecting pipes 31 are respectively connected to the inlets of adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D in a one-to-one correspondence;

[0061] The second end of the driving part is drivingly connected to the movable valve plate 9 of the bottom valve.

[0062] In this embodiment, the driving unit includes:

[0063] The transmission shaft 28 is located between the bottom valve 4 and the top valve 5. One end of the transmission shaft 28 extends into the valve cavity 6 of the top valve 5 and is fixedly connected to the top valve movable valve disc 18; the other end extends into the valve cavity 6 of the bottom valve 4 and is fixedly connected to the bottom valve movable valve disc 9;

[0064] Ratchet 2 and pawl, the ratchet 2 is fixedly connected to the transmission shaft 28; the pawl is arranged on the fixing frame 3;

[0065] Cylinder 1, the driving end of cylinder 1 is drivingly connected to a tooth of ratchet 2;

[0066] The cylinder 1 pushes the ratchet 2 and drives the transmission shaft 28 to rotate unidirectionally around the central axis of the transmission shaft 28 , thereby driving the bottom valve movable valve plate 9 and the top valve movable valve plate 18 to rotate.

[0067] Specifically, the cylinder 1 pushes the ratchet 2, and the ratchet 2 drives the transmission shaft 28 to rotate, thereby driving the bottom valve movable valve plate 9 and the top valve movable valve plate 18 to rotate, thereby realizing the switching of the circuit.

[0068] In this embodiment, two cylinders 1 are provided and are circulated in the oxygen production process.

[0069] In this embodiment, a bottom valve upper cover plate 8 is further provided in the second valve cavity 62 of the bottom valve 4 . The bottom valve upper cover plate 8 is located on a side of the bottom valve movable valve plate 9 away from the bottom valve static valve plate 10 , and is fixedly connected to the bottom valve movable valve plate 9 .

[0070] In this embodiment, a second clamping spring 272 is arranged in the second valve cavity 62 of the bottom valve 4. The second clamping spring 272 is arranged between the bottom valve upper cover plate 8 and the inner wall of the second valve cavity 62, and is used to clamp the bottom valve movable valve plate 9 and the bottom valve static valve plate 10.

[0071] In this embodiment, the bottom valve 4 is provided with a bottom valve connecting sleeve 26 connected to the pipeline, and the bottom valve connecting sleeve 26 is provided with the same holes as the static valve plate 10 of the bottom valve.

[0072] In this embodiment, a top valve upper cover plate 17 is further provided in the first valve chamber 61 of the top valve 5 . The top valve upper cover plate 17 is located on the side of the top valve movable valve plate 18 away from the top valve static valve plate 19 , and is fixedly connected to the top valve movable valve plate 18 .

[0073] In this embodiment, a first compression spring 271 is arranged in the first valve chamber 61 of the top valve 5. The first compression spring 271 is arranged between the top valve upper cover plate 17 and the inner wall of the first valve chamber 61, and is used to compress the top valve movable valve plate 18 and the top valve static valve plate 19.

[0074] In this embodiment, a top valve oxygen outlet plate 25 connected to a pipeline is provided on the top valve 5 , and the top valve oxygen outlet plate 25 is provided with holes that are the same as the top valve static valve plate 19 .

[0075] The present embodiment provides a multi-channel airflow distribution rotary valve composed of a bottom valve and a top valve, which is used in conjunction with four adsorption towers. Its working principle is as follows: air enters through the air inlet on the side of the bottom valve, and the cylinder drives the ratchet-driven bottom valve movable valve plate to rotate. The air passes through the air inlet hole on the bottom valve movable valve plate, and then passes through the first through hole on the bottom valve static valve plate to enter the adsorption tower A for adsorption. At the same time, the desorption groove on the bottom valve movable valve plate is connected to the corresponding hole of the adsorption tower D for desorption. At the same time, in the top valve, the pressure equalizing groove of the top valve movable valve plate connects the corresponding holes of the adsorption towers B and C for pressure equalization. The oxygen adsorbed from the adsorption tower A passes through the second through hole. The hole and the third through hole enter the connecting groove of the top valve, a small amount of oxygen enters the adsorption tower D through the first through hole and the second through hole, and the adsorption tower D is cleaned and backblown, and most of the oxygen is sent out of the rotary valve through the connecting groove and the oxygen outlet hole. With the rotation of the multi-channel rotary valve, the adsorption tower A performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, while the adsorption tower B performs pressure reduction, backblowing, pressure equalization and adsorption processes in sequence, the adsorption tower C performs adsorption, pressure equalization, pressure reduction and backblowing processes in sequence, and the adsorption tower D performs pressure equalization, adsorption, pressure reduction and backblowing processes in sequence. At this point, the four adsorption tower groups have undergone a pressure swing adsorption cycle to achieve air separation and oxygen production.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A multi-channel airflow distribution rotary valve combined with a bottom valve and a top valve for molecular sieve oxygen production, characterized in that: include: Fixed frame (3); A top valve (5) and a bottom valve (4) are arranged up and down and mounted on the fixing frame (3), wherein the top valve (5) has a first valve cavity (61) therein, and the bottom valve (4) has a second valve cavity (62) therein; an air inlet (7) communicating with the second valve cavity (62) is arranged on one side of the bottom valve (4); the top valve (5) is provided with four air inlet pipes (32) communicating with the first valve cavity (61) and an oxygen outlet pipe (29), and the four air inlet pipes (32) are connected to the air outlet ends of the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D in a one-to-one correspondence; the bottom valve (4) is provided with four connecting pipes (31) communicating with the second valve cavity (62) and a nitrogen exhaust pipe (30), and the four connecting pipes (31) are connected to the inlets of the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D in a one-to-one correspondence; A first control mechanism and a second control mechanism, wherein the first control mechanism is arranged in the first valve chamber (61), and the second control mechanism is arranged in the second valve chamber (62); a driving unit, the driving unit being located between the bottom valve (4) and the top valve (5), the first end of the driving unit being drivingly connected to the first control mechanism in the first valve chamber (61), and the second end of the driving unit being drivingly connected to the second control mechanism in the second valve chamber (62); In which, air enters the second valve chamber (62) through the air inlet (7) of the bottom valve (4), and the driving unit drives the first control mechanism and the second control mechanism to rotate synchronously; the driving unit drives the first control mechanism and the second control mechanism to rotate, so that the adsorption tower A sequentially performs adsorption, pressure equalization, pressure reduction and backblowing processes, and the adsorption tower B sequentially performs pressure reduction, backblowing, pressure equalization and adsorption processes, the adsorption tower C sequentially performs adsorption, pressure equalization, pressure reduction and backblowing processes, and the adsorption tower D sequentially performs pressure equalization, adsorption, pressure reduction and backblowing processes. At this point, the adsorption tower A, the adsorption tower B, the adsorption tower C and the adsorption tower D have undergone a pressure swing adsorption cycle to achieve air separation and oxygen production.

2. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 1, characterized in that: The first control mechanism comprises a top valve static valve plate (19) and a top valve dynamic valve plate (18) located in the first valve chamber (61) and arranged opposite to each other up and down; Wherein, four second through holes (22) and four third through holes (23) are evenly arranged along the circumferential direction on the static valve plate (19) of the top valve, wherein the diameter of the pitch circle where the centers of the four second through holes (22) are located is greater than the diameter of the pitch circle where the centers of the four third through holes (23) are located, and the pitch circle where the centers of the four second through holes (22) are located is concentric with the pitch circle where the centers of the four third through holes (23) are located; one second through hole (22) and one third through hole (23) form a group; an oxygen outlet hole (24) is provided on the static valve plate (19) of the top valve, and the oxygen outlet hole (24) is provided between two adjacent second through holes (22); The movable valve plate (18) of the top valve is provided with an annular connecting groove (20), and the center of the movable valve plate (18) of the top valve is provided with a strip-shaped pressure equalizing groove (21), and the connecting groove (20) is sleeved on the outer side of the pressure equalizing groove (21); the pressure equalizing groove (21) is used to connect the two opposite third through holes (23) on the static valve plate (19) of the top valve, so as to perform a pressure equalization process for the adsorption tower B and the adsorption tower C, or the adsorption tower A and the adsorption tower D; the connecting groove (20) is used to connect the second through hole (22) and the oxygen outlet hole (24) on the static valve plate (19) of the top valve; The first end of the driving part is drivingly connected to the top valve movable valve plate (18).

3. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 2, characterized in that: The second control mechanism comprises a bottom valve movable valve disc (9) and a bottom valve static valve disc (10) which are located in the second valve cavity (62) and are arranged opposite to each other up and down; The bottom valve movable valve plate (9) is provided with a plurality of air intake holes (11) arranged in a circumferential direction; an elliptical desorption groove (12) is provided on the bottom valve movable valve plate (9) in a symmetrical direction of the plurality of air intake holes (11); an arc-shaped beam is provided in the desorption groove (12) to divide the desorption groove (12) into two upper and lower parts; an analytical blind hole (13) is provided at the center position of the bottom valve movable valve plate (9); three communicating holes (14) are provided inside the desorption groove (12); the three communicating holes (14) are connected to the analytical blind hole (13); The bottom valve static valve plate (10) is provided with two groups of first through holes (15) along the circumferential direction, wherein four first through holes (15) are the first group and the other four first through holes (15) are the second group; the four first through holes (15) of the first group are provided correspondingly to the four first through holes (15) of the second group; the pitch circle where the center of the first through holes (15) of the first group is located is concentric with the pitch circle where the center of the first through holes (15) of the second group is located, and the diameter of the pitch circle where the center of the first through holes (15) of the first group is located is greater than the diameter of the pitch circle where the center of the first through holes (15) of the second group is located; the first through holes (15) of the first group and the corresponding first through holes (15) of the second group are a group, forming four groups, and are respectively provided correspondingly to the four connecting pipes (31); The second end of the driving part is drivingly connected to the bottom valve movable valve plate (9).

4. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 3, characterized in that: The driving unit comprises: a transmission shaft (28), wherein the transmission shaft (28) is located between the bottom valve (4) and the top valve (5), one end of the transmission shaft (28) extends into a first valve cavity (61) of the top valve (5) and is fixedly connected to the top valve movable valve disc (18); and the other end of the transmission shaft (28) extends into a second valve cavity (62) of the bottom valve (4) and is fixedly connected to the bottom valve movable valve disc (9); A ratchet (2) and a pawl, wherein the ratchet (2) is fixedly connected to the transmission shaft (28); and the pawl is arranged on the fixing frame (3); A cylinder (1), wherein a driving end of the cylinder (1) is drivingly connected to a tooth of the ratchet wheel (2); The cylinder (1) pushes the ratchet (2) and drives the transmission shaft (28) to rotate unidirectionally around the central axis of the transmission shaft (28), thereby driving the bottom valve movable valve plate (9) and the top valve movable valve plate (18) to rotate.

5. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 4, characterized in that: A bottom valve upper cover plate (8) is also provided in the second valve cavity (62) of the bottom valve (4). The bottom valve upper cover plate (8) is located on a side of the bottom valve movable valve plate (9) away from the bottom valve static valve plate (10), and is fixedly connected to the bottom valve movable valve plate (9).

6. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 5, characterized in that: A second compression spring (272) is arranged in the second valve cavity (62) of the bottom valve (4), and the second compression spring (272) is arranged between the bottom valve upper cover plate (8) and the inner wall of the second valve cavity (62).

7. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 6, characterized in that: The bottom valve (4) is provided with a bottom valve connecting sleeve (26) connected to a pipeline, and the bottom valve connecting sleeve (26) is provided with a hole that is the same as the bottom valve static valve plate (10).

8. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 4, characterized in that: A top valve upper cover plate (17) is also provided in the first valve chamber (61) of the top valve (5). The top valve upper cover plate (17) is located on a side of the top valve movable valve plate (18) away from the top valve static valve plate (19), and is fixedly connected to the top valve movable valve plate (18).

9. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 8, characterized in that: A first compression spring (271) is arranged in the first valve cavity (61) of the top valve (5), and the first compression spring (271) is arranged between the top valve upper cover plate (17) and the inner wall of the first valve cavity (61).

10. The multi-channel airflow distribution rotary valve for molecular sieve oxygen production combined with a bottom valve and a top valve according to claim 9, characterized in that: The top valve (5) is provided with a top valve oxygen outlet plate (25) connected to a pipeline, and the top valve oxygen outlet plate (25) is provided with holes that are the same as those of the top valve static valve plate (19).

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