A gas distribution valve and an oxygen generator

Abstract

This utility model provides a gas distribution valve, comprising: a valve seat, wherein a first oxygen supply pipeline, a nitrogen discharge pipeline, and an air inlet pipeline are provided; a base interface is disposed on the valve seat and has two openings; an oxygen outlet pipeline, a nitrogen discharge pipeline, and an air inlet pipeline are respectively connected to the first oxygen supply pipeline, the nitrogen discharge pipeline, and the air inlet pipeline; any one of the three pipelines is fixedly disposed on the base interface or the valve seat, and the remaining two are respectively limited and installed in the two openings with gaps between them, and are detachably connected to the valve seat. This utility model also provides an oxygen generator. The advantage of this utility model is that the oxygen outlet pipeline, the nitrogen discharge pipeline, and the air inlet pipeline are integrated on one side for easy disassembly and assembly, and one of the three is used as a fixed structure for guiding and positioning, while the gaps between the other two allow for fine-tuning during docking with the molecular sieve gas inlet seat, thereby ensuring the reliability of the docking.

Description

Technical Field

[0001] This utility model relates to the field of oxygen generator technology, and in particular to a gas distribution valve and an oxygen generator. Background Technology

[0002] Currently, home oxygen concentrators primarily rely on air compressors to compress air and then use molecular sieves to separate and extract oxygen from the air, providing relatively pure oxygen for home use. In common home oxygen concentrator product designs, the molecular sieve cylinder and the air compressor are the core components.

[0003] To reduce the height of the molecular sieve cylinder without decreasing the molecular sieve content, both the air inlet and oxygen outlet are located on the same side of the molecular sieve cylinder. A gas distribution valve, located on one side of the molecular sieve cylinder, is used to rationally distribute the gas flow in the oxygen generator. It is equipped with an air inlet pipe, a nitrogen exhaust pipe, and an oxygen outlet pipe. For ease of assembly, these pipes are all located on the same side of the molecular sieve cylinder. However, if all three interface pipes are fixed to the gas distribution valve, when connecting the gas distribution valve to the molecular sieve gas connector in the oxygen generator, it is necessary to ensure that the three interface pipes precisely align with the three mating holes on the molecular sieve gas connector to guarantee a leak-free connection. This places higher demands on the machining precision of the oxygen generator. Utility Model Content

[0004] The purpose of this invention is to provide a gas distribution valve that can ensure accurate connection between the inlet pipe, nitrogen outlet pipe, and oxygen outlet pipe and the molecular sieve gas connector, while also helping to reduce the machining precision required for the oxygen generator.

[0005] This utility model provides a gas distribution valve for use in an oxygen generator. The oxygen generator includes a molecular sieve module and a compressor module. The molecular sieve module includes a molecular sieve cylinder with molecular sieve material inside. The gas distribution valve includes: a valve seat disposed at the bottom of the molecular sieve cylinder, wherein a first oxygen supply pipe connected to the oxygen outlet of the molecular sieve cylinder, a nitrogen discharge pipe connected to the nitrogen discharge outlet of the molecular sieve cylinder, and an air inlet pipe connected to the air inlet of the molecular sieve cylinder; a base interface disposed on the valve seat, and having two through openings; an oxygen outlet pipe, a nitrogen discharge pipe, and an air inlet pipe respectively connected to the first oxygen supply pipe, the nitrogen discharge pipe, and the air inlet pipe; any one of the oxygen outlet pipe, the nitrogen discharge pipe, and the air inlet pipe is fixedly disposed on the base interface or the valve seat, and the remaining two are respectively limited and installed in the two openings with gaps between them, and are detachably connected to the valve seat.

[0006] Preferably, the oxygen outlet pipe is fixedly installed on the base interface; the two openings are respectively the first opening and the second opening; the nitrogen exhaust pipe is installed in the first opening, and the air inlet pipe is installed in the second opening.

[0007] Preferably, both the first opening and the second opening are stepped openings, and both the nitrogen exhaust pipe and the air inlet pipe include a pipe body and a protrusion disposed on the outer periphery of the pipe body. The protrusion is matched with the large diameter portion of the stepped opening, and there is a gap between the pipe body and the small diameter portion of the stepped opening.

[0008] Preferably, the nitrogen venting pipeline includes a first interface opened on the valve seat, and the upper end of the nitrogen venting pipe is inserted into the first interface; the air intake pipeline includes a second interface opened on the valve seat, and the upper end of the air intake pipe is inserted into the second interface.

[0009] Preferably, the first oxygen delivery pipeline is equipped with a one-way valve to prevent oxygen from flowing back into the oxygen outlet of the molecular sieve cylinder.

[0010] Preferably, the valve seat is further provided with a pressure equalization valve mounting hole for installing a pressure equalization valve and a solenoid valve mounting hole for installing a solenoid valve.

[0011] This utility model also provides an oxygen generator, including a molecular sieve module and a compressor module. The molecular sieve module includes a molecular sieve cylinder with molecular sieve material inside, and the molecular sieve module also includes the aforementioned gas distribution valve. The oxygen generator also includes a main frame module, which includes a main support and a molecular sieve gas inlet seat disposed on the main support. The molecular sieve gas inlet seat is respectively provided with an oxygen outlet channel, a nitrogen outlet channel, and an air inlet channel that are connected to the oxygen outlet pipe, the nitrogen outlet pipe, and the air inlet pipe.

[0012] Preferably, the main support includes a base portion, on which a gas receiving seat mounting groove is provided. The molecular sieve gas receiving seat includes a main body portion and a mounting plate disposed on the outer periphery of the main body portion. The mounting plate is embedded in the gas receiving seat mounting groove and is detachably connected to the base portion.

[0013] Preferably, the molecular sieve module further includes a molecular sieve inner shell connected to the molecular sieve cylinder, the bottom of the molecular sieve inner shell is provided with a slot, the oxygen outlet pipe, the nitrogen outlet pipe and the air inlet pipe extend downward to the slot; the main body protrudes upward and is embedded in the slot.

[0014] Preferably, it also includes an oxygen storage tank disposed within the main support, wherein the entire or part of the oxygen storage tank is disposed below the molecular sieve gas inlet seat and forms a snap-fit ​​sealing connection with the lower end of the oxygen outlet channel.

[0015] The advantages of this utility model are that, in order to improve the disassembly and assembly efficiency of the modular oxygen generator, the oxygen outlet pipe, nitrogen discharge pipe, and air inlet pipe are integrated on one side for easy disassembly and assembly. At the same time, due to the increase in interfaces, it is easy for the hole positions to be difficult to align during installation. Therefore, one of the three is used as a fixed structure to play a guiding and positioning role, while the other two are made of movable gaps to allow for fine adjustment during docking with the molecular sieve gas inlet seat, thereby ensuring the reliability of docking. In addition, it can also reduce the precision requirements in the processing process and improve the assembly efficiency. Attached Figure Description

[0016] Figure 1 This is a perspective view of the oxygen generator of this utility model; Figure 2 and Figure 3 These are 3D views of the molecular sieve module after the outer shell of the molecular sieve has been removed; Figure 4 This is a schematic diagram of the connection structure between the gas distribution valve and the molecular sieve cylinder; Figure 5 This is a schematic diagram of the valve seat structure; Figure 6 (a) and (b) are schematic diagrams of the base interface from different perspectives; Figure 7 This is a cross-sectional view of the gas distribution valve; Figure 8 It is a cross-sectional view of the interface between the nitrogen exhaust pipe / intake pipe and the base; Figure 9 This is a 3D view of the main frame module; Figure 10 This is a cross-sectional view of the connection structure between the molecular sieve module and the main frame module; Figure 11 This is a schematic diagram of the installation structure of the main frame module and the molecular sieve gas inlet. Figure 12 This is a 3D view of the molecular sieve gas inlet. Figure 13 This is a schematic diagram of the installation structure of the auxiliary gas tank and the molecular sieve gas inlet. Figure 14 This is a 3D view of the auxiliary gas tank.

[0017] Component designation explanation: 1-Main frame module; 11-Main support; 111-Base section; 1111-Interface mounting slot; 121-Main gas tank; 122-Auxiliary gas tank; 1221-Oxygen inlet; 1222-Oxygen delivery port; 13-Molecular sieve gas inlet; 131-Main body; 132-Mounting plate; 133-Oxygen outlet channel; 134-Second threaded hole; 135-Nitrogen discharge channel; 136-Gas inlet channel; 14-Compressor gas inlet; 2-Molecular sieve module; 21-Molecular sieve outer shell; 22-Molecular sieve cylinder; 23-Molecular sieve inner shell; 231-Groogging; 3-Compressor module; 31-Heat dissipation vent; 4-Power supply module; 5-Gas distribution valve; 51-Valve seat; 511-Equalizing valve mounting hole; 512-Solenoid valve mounting hole; 513-First oxygen supply line; 514-Nitrogen discharge line; 515-Inlet line; 516-Connecting hole; 52-Base interface; 521-Second oxygen supply line; 522-First opening; 523-Second opening; 524-Third threaded hole; 61-Oxygen outlet pipe; 62-Nitrogen discharge pipe; 63-Inlet pipe; 641-Pipe body; 642-Protrusion; 7-Sealing ring; 8-Solenoid valve; 9-Fasteners. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. These embodiments are only used to illustrate this utility model and are not intended to limit it.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] Figure 1 The image shown is a perspective view of the oxygen concentrator of this utility model. In the following description, it will be referred to as... Figure 1 The attached diagram serves as a reference for orientation, defining the height direction of the main frame module 1 as the up-down direction.

[0022] This utility model provides a gas distribution valve and an oxygen generator equipped with the gas distribution valve.

[0023] like Figure 1 and Figure 9 As shown, the oxygen generator provided by this utility model includes a main frame module 1, a molecular sieve module 2, a compressor module 3, and a power supply module 4. The main frame module 1 is the main body of the oxygen generator, primarily used to connect and support other modules. The compressor module 3 includes a compressor housing and a compressor housed within the housing. The compressor draws in outside air and compresses it to a certain pressure, providing the necessary power and pressure conditions for the subsequent air separation process. The molecular sieve module 2 is the core component in the oxygen generator that achieves oxygen separation. It utilizes specific molecular sieve materials to separate oxygen and nitrogen from compressed air through the principles of adsorption and desorption. The battery module 4 provides power to key components such as the compressor and the molecular sieve module 2.

[0024] like Figure 1 and Figure 2 As shown, the molecular sieve module 2 includes a molecular sieve shell 21, a molecular sieve cylinder 22 with molecular sieve material inside, a molecular sieve inner shell 23 disposed inside the molecular sieve shell 21 and used to connect the molecular sieve cylinder 22 and the molecular sieve shell 21, and a gas distribution valve 5 provided by this utility model.

[0025] like Figure 2-7 As shown, the gas distribution valve 5 includes a valve seat 51, a base interface 52, an oxygen outlet pipe 61, a nitrogen discharge pipe 62, and an air inlet pipe 63. The valve seat 51 is detachably mounted at the bottom of the molecular sieve cylinder 22, and includes a first oxygen supply pipe 513 connected to the oxygen outlet of the molecular sieve cylinder 22, a nitrogen discharge pipe 514 connected to the nitrogen discharge port of the molecular sieve cylinder 22, and an air inlet pipe 515 connected to the air inlet of the molecular sieve cylinder 22. The base interface 52 is detachably mounted at the bottom of the valve seat 51, and has two through-holes. Any one of the oxygen outlet pipe 61, nitrogen discharge pipe 62, and air inlet pipe 63 is fixedly mounted on the base interface 52 or the valve seat 51, while the remaining two are respectively confined within the two through-holes with gaps between them, and are detachably connected to the valve seat 51.

[0026] In one specific embodiment of this utility model, the oxygen outlet pipe 61 is fixedly mounted on the base interface 52 and connected to the first oxygen supply pipeline 513. Two openings are formed in the base interface 52, namely the first opening 522 and the second opening 523. The nitrogen venting pipe 62 is limited and installed in the first opening 522 with a gap between it and the first opening 522. Simultaneously, the nitrogen venting pipe 62 is detachably connected to the valve seat 51 and connected to the nitrogen venting pipeline 514. The air inlet pipe 63 is limited and installed in the second opening 523 with a gap between it and the second opening 523. Simultaneously, the air inlet pipe 63 is detachably connected to the valve seat 51 and connected to the air inlet pipeline 515. Those skilled in the art can also, as needed, configure the nitrogen venting pipe 62 or the air inlet pipe 63 as a fixed pipe.

[0027] like Figure 9 As shown, the main frame module 1 includes a main support 11 and an oxygen storage tank disposed within the main support 11. The main support 11 is the main supporting structure, and the oxygen storage tank is connected to the molecular sieve module 2 to store the oxygen separated by the molecular sieve module 2. Specifically, the main support 11 is provided with a compressor gas inlet 14 and a molecular sieve gas inlet 13, wherein the compressor gas inlet 14 is connected to the outlet and nitrogen inlet of the compressor module 3, and the molecular sieve gas inlet 13 is provided with an oxygen outlet channel 133, a nitrogen outlet channel 135, and an air inlet channel 136 respectively, which are connected to the oxygen outlet pipe 61, the nitrogen outlet pipe 62, and the air inlet pipe 63. The compressor gas inlet 14, the molecular sieve gas inlet 13, and the oxygen storage tank are connected sequentially through pipelines to achieve gas path communication.

[0028] The advantages of this utility model are that, in order to improve the disassembly and assembly efficiency of the modular oxygen generator, the oxygen outlet pipe, nitrogen discharge pipe, and air inlet pipe are integrated on one side for easy disassembly and assembly. At the same time, due to the increase in interfaces, it is easy for the hole positions to be difficult to align during installation. Therefore, one of the three is used as a fixed structure to play a guiding and positioning role, while the other two are made of movable gaps to allow for fine adjustment during docking with the molecular sieve gas inlet seat, thereby ensuring the reliability of docking. In addition, it can also reduce the precision requirements in the processing process and improve the assembly efficiency.

[0029] like Figure 7 and Figure 8 As shown, both the first opening 522 and the second opening 523 are stepped holes that extend vertically. Each stepped hole includes a large-diameter section and a small-diameter section that are connected sequentially from top to bottom. Both the nitrogen venting pipe 62 and the air inlet pipe 63 include a pipe body 641 and a protrusion 642 on the outer periphery of the pipe body 641. The protrusion 642 is fitted with the large-diameter section of the stepped hole to limit the pipe body 641, preventing it from coming out of the first opening 522 or the second opening 523. There is a gap between the pipe body 641 and the small-diameter section of the stepped hole, which allows the pipe body 641 to move slightly within the first opening 522 or the second opening 523, thereby meeting the docking requirements between the gas distribution valve 5 and the molecular sieve gas inlet seat 13.

[0030] Furthermore, such as Figure 6 and Figure 7 As shown, sealing rings 7 are snapped into the lower end of the oxygen outlet pipe 61, the upper and lower ends of the nitrogen outlet pipe 62 and the air inlet pipe 63. By setting the sealing rings 7, an airtight connection can be achieved between each pipe and the valve seat 51 and the molecular sieve gas inlet seat 13 to prevent gas leakage.

[0031] The first oxygen supply line 513, nitrogen discharge line 514, and air intake line 515 have various configurations within the valve seat 51. One configuration includes a concealed section within the valve seat 51 and a protruding air passage extending outward from the valve seat 51, which is detachably connected to the oxygen outlet line 61, nitrogen discharge line 62, or air intake line 63; another configuration is as follows... Figure 5 and Figure 6 As shown, the system includes concealed pipes and exposed interfaces disposed within and interconnected in the valve seat 51. In a specific embodiment of this utility model, the nitrogen venting pipe 514 includes a first interface formed on the valve seat 51, with the upper end of the nitrogen venting pipe 62 inserted into the first interface; the air intake pipe 515 includes a second interface formed on the valve seat 51, with the upper end of the air intake pipe 63 inserted into the second interface; the first oxygen supply pipe 513 includes a third interface formed on the valve seat 51, and a second oxygen supply pipe 521 connected to the oxygen outlet pipe 61 is provided in the base interface 52. The second oxygen supply pipe 521 includes an extension portion disposed at the bottom of the base interface 52 and extending downward, the extension portion being snapped into the third interface.

[0032] Since both the air inlet and oxygen outlet of the molecular sieve cylinder 22 are located at the bottom of the molecular sieve cylinder 22, a one-way valve is provided in the first oxygen delivery pipeline 513 to prevent oxygen from flowing back into the oxygen outlet of the molecular sieve cylinder 22. In addition, to facilitate the assembly of the molecular sieve module 2, the main body of the valve seat 51 is rectangular, so that the valve seat 51 can serve as the bottom end cap of the molecular sieve cylinder 22 and be sealed to the bottom of the molecular sieve cylinder 22.

[0033] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, the valve seat 51 is also provided with a pressure equalization valve mounting hole 511 for installing the pressure equalization valve and a solenoid valve mounting hole 512 for installing the solenoid valve 8. The base interface 52 is preferably T-shaped and is located away from the pressure equalization valve mounting hole 511 and the solenoid valve mounting hole 512, which is conducive to the miniaturization of the gas distribution valve 5 and saves installation space.

[0034] like Figure 3 and Figure 9As shown, a slot 231 is provided at the bottom of the molecular sieve inner shell 23. The oxygen outlet pipe 61, nitrogen outlet pipe 62 and air inlet pipe 63 all extend downward and pass through the slot 231 so as to connect with the molecular sieve gas receiving seat 13 on the main support 11.

[0035] In one embodiment of this utility model, such as Figure 11 and Figure 12 As shown, the main support 11 includes a base portion 111, on which a gas receiving seat mounting groove 1111 is formed. The molecular sieve gas receiving seat 13 includes a main body portion 131 and a mounting plate 132 disposed on the outer periphery of the main body portion 131. The mounting plate 132 is embedded in the gas receiving seat mounting groove 1111 and is detachably connected to the base portion 111. The oxygen outlet channel 133, the nitrogen discharge channel 135, and the air inlet channel 136 are all disposed in the main body portion 131. The air inlet channel 136 is used to connect the air outlet of the compressor and the air inlet pipe 63, the nitrogen discharge channel 135 is used to connect the nitrogen inlet of the compressor module 3 and the nitrogen discharge pipe 62, and the oxygen outlet channel 133 is used to connect the oxygen storage tank and the oxygen outlet pipe 61.

[0036] like Figure 1 , Figure 3 , Figure 9-12 As shown, preferably, the main body 131 protrudes upward and is fitted into the slot 231 at the bottom of the molecular sieve inner shell 23. After the molecular sieve module 2 is assembled on the base 111, the oxygen outlet pipe 61, the nitrogen outlet pipe 62, and the air inlet pipe 63 are respectively inserted into the oxygen outlet channel 133, the nitrogen outlet channel 135, and the air inlet channel 136 in the molecular sieve gas receiving seat 13 to achieve an airtight connection.

[0037] The oxygen flow path of the oxygen concentrator is as follows: After being compressed by the compressor, the oxygen flows through the outlet of the compressor module 3, the compressor inlet seat 14, the inlet channel 136 of the molecular sieve inlet seat 13, the inlet pipe 63, and the inlet of the molecular sieve cylinder 22 to the interior of the molecular sieve cylinder 22, where oxygen and nitrogen are separated by the molecular sieve material. The separated oxygen is transported through the outlet of the molecular sieve cylinder 22, the first oxygen delivery pipeline 513, the outlet pipe 61, and the outlet channel 133 of the molecular sieve inlet seat 13 to the oxygen storage tank for storage. Then, it is output from the outlet at the top of the oxygen storage tank to the oxygen injection valve, which outputs oxygen when the user inhales. The separated nitrogen is discharged under the negative pressure of the compressor through the nitrogen discharge port of the molecular sieve cylinder 22, the nitrogen discharge pipeline 514, the nitrogen discharge pipe 62, the nitrogen discharge channel 135 of the molecular sieve inlet seat 13, and the heat dissipation vent 31 on the compressor housing.

[0038] Furthermore, such as Figure 11-14 As shown, the oxygen storage tank is installed entirely or partially below the molecular sieve gas inlet seat 13 and forms a snap-fit ​​seal connection with the lower end of the oxygen outlet channel 133.

[0039] Specifically, the oxygen storage tank includes a main gas tank 121 and a secondary gas tank 122 connected to each other. The secondary gas tank 122 is provided with an oxygen inlet 1221 and an oxygen delivery port 1222. The oxygen inlet 1221 of the secondary gas tank 122 is located below the molecular sieve gas receiving seat 13 and forms a snap-fit ​​seal connection with the lower end of the oxygen outlet channel 133. The oxygen delivery port 1222 is connected to the oxygen inlet of the main gas tank 121. The oxygen separated by the molecular sieve module 2 can be transported to the secondary gas tank 122 for storage through the oxygen outlet of the molecular sieve cylinder 22, the first oxygen delivery pipeline 513, the oxygen outlet pipe 61, the oxygen outlet channel 133 of the molecular sieve gas receiving seat 13, and the oxygen inlet 1221 of the secondary gas tank 122, and then transported to the main gas tank 121 for storage through the oxygen delivery port 122 of the secondary gas tank 122.

[0040] like Figure 5 , Figure 6 and Figure 10 As shown, the main frame module 1 has a first threaded hole, the main body 131 of the molecular sieve gas inlet seat 13 has a second threaded hole 134, and the base interface 52 has a third threaded hole 524. Fasteners 9 pass through the first threaded hole, the second threaded hole 134, and the third threaded hole 524 sequentially from bottom to top, securing the main frame module 1, the molecular sieve gas inlet seat 13, and the base interface 52 together. The fasteners 9 are specifically screws. Simultaneously, the valve seat 51 also has a connecting hole 516, which is fastened to the molecular sieve cylinder 22 by screws.

[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A gas distribution valve for use in an oxygen generator, the oxygen generator comprising a molecular sieve module (2) and a compressor module (3), the molecular sieve module (2) comprising a molecular sieve cylinder (22) internally provided with molecular sieve material, characterized in that, The gas distribution valve (5) includes: A valve seat (51) is provided at the bottom of the molecular sieve cylinder (22), wherein a first oxygen supply pipeline (513) is connected to the oxygen outlet of the molecular sieve cylinder (22), a nitrogen discharge pipeline (514) is connected to the nitrogen discharge outlet of the molecular sieve cylinder (22), and an air inlet pipeline (515) is connected to the air inlet of the molecular sieve cylinder (22). The base interface (52) is provided on the valve seat (51) and has two through holes; The oxygen outlet pipe (61), nitrogen discharge pipe (62), and air inlet pipe (63) are respectively connected to the first oxygen supply line (513), the nitrogen discharge line (514), and the air inlet line (515); Any one of the oxygen outlet pipe (61), the nitrogen discharge pipe (62), and the air inlet pipe (63) is fixedly installed on the base interface (52) or the valve seat (51), and the remaining two are respectively limited and installed in the two openings with gaps between them, and are detachably connected to the valve seat (51).

2. The gas distribution valve according to claim 1, characterized in that, The oxygen outlet pipe (61) is fixedly installed on the base interface (52); the two openings are the first opening (522) and the second opening (523) respectively; the nitrogen discharge pipe (62) is installed in the first opening (522) and the air inlet pipe (63) is installed in the second opening (523).

3. The gas distribution valve according to claim 2, characterized in that, The first opening (522) and the second opening (523) are both stepped holes. The nitrogen exhaust pipe (62) and the air inlet pipe (63) both include a pipe body (641) and a protrusion (642) provided on the outer periphery of the pipe body (641). The protrusion (642) is in a limiting fit with the large diameter portion of the stepped hole, and there is a gap between the pipe body (641) and the small diameter portion of the stepped hole.

4. The gas distribution valve of claim 1, wherein, The nitrogen venting pipeline (514) includes a first interface opened on the valve seat (51), and the upper end of the nitrogen venting pipe (62) is inserted into the first interface; the air intake pipeline (515) includes a second interface opened on the valve seat (51), and the upper end of the air intake pipe (63) is inserted into the second interface.

5. The gas distribution valve according to claim 1, characterized in that, The first oxygen delivery pipeline (513) is equipped with a one-way valve to prevent oxygen from flowing back into the oxygen outlet of the molecular sieve cylinder (22).

6. The gas distribution valve according to claim 1, characterized in that, The valve seat (51) is also provided with a pressure equalization valve mounting hole (511) for installing a pressure equalization valve and a solenoid valve mounting hole (512) for installing a solenoid valve.

7. An oxygen generator, comprising a molecular sieve module (2) and a compressor module (3), wherein the molecular sieve module (2) includes a molecular sieve cylinder (22) internally provided with molecular sieve material, characterized in that, The molecular sieve module (2) further includes a gas distribution valve (5) as described in any one of claims 1-6; The oxygen generator also includes a main frame module (1), which includes a main support (11) and a molecular sieve gas receiving seat (13) disposed on the main support (11). The molecular sieve gas receiving seat (13) is provided with an oxygen outlet channel (133), a nitrogen discharge channel (135), and an air inlet channel (136) respectively connected to the oxygen outlet pipe (61), the nitrogen discharge pipe (62), and the air inlet pipe (63).

8. The oxygen generator according to claim 7, characterized in that The main support (11) includes a base part (111), and the base part (111) is provided with a gas receiving seat mounting groove (1111). The molecular sieve gas receiving seat (13) includes a main body part (131) and a mounting plate (132) disposed on the outer periphery of the main body part (131). The mounting plate (132) is embedded in the gas receiving seat mounting groove (1111) and is detachably connected to the base part (111).

9. The oxygen generator according to claim 8, characterized in that, The molecular sieve module (2) also includes a molecular sieve inner shell (23) connected to the molecular sieve cylinder (22). The bottom of the molecular sieve inner shell (23) is provided with a slot (231). The oxygen outlet pipe (61), nitrogen outlet pipe (62) and air inlet pipe (63) extend downward to the slot (231). The main body (131) protrudes upward and is embedded in the slot (231).

10. The oxygen generator according to claim 7, characterized in that, It also includes an oxygen storage tank disposed in the main support (11), the whole or part of which is disposed below the molecular sieve gas inlet seat (13) and forms a snap-fit ​​sealing connection with the lower end of the oxygen outlet channel (133).

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