Solenoid valve for oxygen generator and oxygen generator

Abstract

The utility model discloses a solenoid valve for an oxygen generator and the oxygen generator, and relates to the technical field of oxygen generators. According to the technical scheme, the valve is characterized by comprising a valve body, a valve rod and a valve seat, wherein a valve cavity, an air inlet, a working port and an exhaust port are formed in the valve body, and the air inlet, the working port and the exhaust port are communicated with the valve cavity; an upper opening and a lower opening are formed in the two ends of the valve cavity respectively, the valve seat is embedded into the valve cavity from the lower opening, and an air inlet channel communicated with the air inlet and the valve cavity is formed in the valve seat. According to the utility model, the air inlet channel is arranged in the valve seat, then the valve seat is independently processed, and the valve cavity is arranged in a through manner, so that the processing difficulty of the valve seat and the valve body can be simultaneously reduced, the processing precision is improved, the assembly is convenient, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of oxygen generator technology, and more specifically, it relates to a solenoid valve for an oxygen generator and an oxygen generator. Background Technology

[0002] A Chinese patent with publication number CN111255924A discloses a pneumatic combination valve for extending the service life of a molecular sieve oxygen generation system. The valve includes a pilot solenoid valve, a valve body, a cover plate, a push rod assembly, and a return spring. The valve body has an air inlet for inputting air, an exhaust port for discharging nitrogen, and ports A and B, respectively connected to the molecular sieve system. The air inlet, exhaust port, ports A and B are all located on the side of the valve body. A receiving cavity for accommodating the push rod assembly is formed in the central region of the valve body. The push rod assembly divides the receiving cavity into a first receiving cavity and a second receiving cavity. The exhaust port communicates with the first receiving cavity, and ports A and B communicate with the second receiving cavity.

[0003] However, the pneumatic combination valve in the aforementioned patent still has the following problems: one end of the receiving cavity is closed, which makes the valve body difficult to process and affects assembly efficiency and quality. Utility Model Content

[0004] To address the shortcomings of existing technologies, one of the objectives of this utility model is to provide a solenoid valve for an oxygen generator, which arranges the air intake channel in the valve seat and then processes the valve seat separately, while the valve cavity is designed to be through-hole. This can reduce the processing difficulty of the valve seat and valve body, improve processing accuracy, facilitate assembly, and improve production efficiency.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An oxygen concentrator solenoid valve includes a valve body, a valve stem, and a valve seat. The valve body has a valve cavity and an air inlet, a working port, and an exhaust port that are respectively connected to the valve cavity. The valve cavity has an upper opening and a lower opening at both ends. The valve seat is embedded into the valve cavity through the lower opening, and the valve seat has an air inlet channel that connects the air inlet and the valve cavity.

[0007] Furthermore, the intake passage includes an axial air passage arranged along the valve stem axis and a radial air passage communicating with the axial air passage.

[0008] Furthermore, the intake passage includes multiple radial air passages arranged around the axial air passage.

[0009] Furthermore, the outer wall of the valve seat is provided with an air inlet ring groove that connects multiple radial air passages, and the air inlet ring groove is connected to the air inlet.

[0010] Furthermore, the inner end face of the axial air passage is provided with a guide hole that is clearance-fitted with the end of the valve stem.

[0011] Furthermore, the valve chamber includes a working chamber that connects the axial passage and the working port, and an exhaust chamber that connects the working chamber and the exhaust port;

[0012] The valve stem is equipped with a valve located in the working chamber;

[0013] An air inlet valve port that cooperates with a valve is provided at the opening of the axial channel, and an exhaust valve port that cooperates with a valve is provided in the working chamber.

[0014] Furthermore, the valve stem is also provided with a control diaphragm, which closes the upper opening of the valve cavity; the valve cavity also includes a relief chamber that cooperates with the control diaphragm, and the relief chamber is connected to the exhaust chamber.

[0015] Furthermore, the solenoid valve for the oxygen generator also includes an upper cover that presses against the edge of the control diaphragm, and a pilot solenoid valve disposed on the upper cover; the upper cover is provided with a control chamber opposite to the control diaphragm, and a control air passage connecting the control chamber and the pilot solenoid valve;

[0016] When the pilot solenoid valve is energized, gas is injected into the control chamber, causing the control diaphragm to deform and drive the valve stem to move away from the top cover. Then the valve opens the exhaust valve port and moves to close the intake valve port.

[0017] After the pilot solenoid valve is de-energized, the gas in the control chamber is discharged. The pressure difference on both sides of the control diaphragm promotes its recovery of deformation. The control diaphragm drives the valve stem to move in the direction closer to the upper cover, and the valve opens the air inlet valve port and moves to close the exhaust valve port.

[0018] Furthermore, a reinforcing ring is provided on the control diaphragm; the reinforcing ring has a protrusion on the side facing the control chamber and a groove on the side facing the relief chamber.

[0019] Another objective of this invention is to provide an oxygen generator that includes the aforementioned solenoid valve for an oxygen generator.

[0020] In summary, this utility model has the following beneficial effects:

[0021] 1. By machining channels in the valve body and valve seat respectively, and then embedding the valve seat into the valve cavity, a complete control air path can be formed; by arranging the air intake channel in the valve seat and then machining the valve seat separately, while the valve cavity is set to be through, the machining difficulty of the valve seat and valve body can be reduced, the machining accuracy can be improved, and the assembly can be facilitated, thereby improving production efficiency.

[0022] 2. The design of axial air passages, radial air passages, and inlet ring grooves not only facilitates processing and effectively ensures gas flow, but also plays a buffering role and improves the stability of air path control.

[0023] 3. The control diaphragm serves two purposes: first, to seal the upper opening, and second, to move the valve stem. This reduces the number of parts, facilitates assembly, and improves response speed. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the solenoid valve used in the oxygen generator in Example 1;

[0025] Figure 2 This is a schematic diagram of the valve seat structure in Example 1. Figure 1 ;

[0026] Figure 3 This is a schematic diagram of the valve seat structure in Example 1. Figure 2 .

[0027] In the diagram: 1. Valve body; 11. Displacement chamber; 12. Exhaust chamber; 13. Working chamber; 14. Inlet chamber; 15. Inlet; 16. Exhaust port; 17. Working port; 18. Exhaust valve port; 2. Upper cover; 21. Control chamber; 22. Control air passage; 3. Lower cover; 4. Valve stem; 5. Control diaphragm; 51. Reinforcing ring; 6. Valve; 7. Return spring; 8. Valve seat; 81. Axial air passage; 82. Inlet ring groove; 83. Radial air passage; 84. Guide hole; 85. Inlet valve port; 9. Pilot solenoid valve. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law. Example 1:

[0030] A solenoid valve for an oxygen concentrator, as described in the following figure. Figures 1 to 3 It includes a valve body 1, an upper cover 2, a lower cover 3, a valve stem 4, a control diaphragm 5, a valve 6, a return spring 7, a valve seat 8, and a pilot solenoid valve 9; the valve body 1 is provided with a valve cavity and an air inlet 15, a working port 17, and an exhaust port 16 that are respectively connected to the valve cavity; the two ends of the valve cavity are respectively provided with an upper opening and a lower opening, the valve seat 8 is embedded into the valve cavity from the lower opening, and the valve seat is provided with an air inlet channel that connects the air inlet 15 and the valve cavity.

[0031] Reference Figures 1 to 3In this embodiment, channels are machined in the valve body 1 and valve seat 8 respectively, and then the valve seat 8 is embedded in the valve cavity to form a complete control air path. The air intake channel is arranged in the valve seat 8, and then the valve seat 8 is machined separately. At the same time, the valve cavity is set to be through. This can reduce the machining difficulty of the valve seat 8 and valve body 1, improve the machining accuracy, facilitate assembly, and improve production efficiency.

[0032] Reference Figures 1 to 3 Specifically, in this embodiment, the valve cavity includes a clearance chamber 11, an exhaust chamber 12, a working chamber 13, and an intake chamber 14 arranged in sequence. The opening of the clearance chamber 11 forms an upper opening, and the opening of the intake chamber 14 forms a lower opening. In this embodiment, the inner diameters of the intake chamber 14, the working chamber 13, and the exhaust chamber 12 decrease sequentially, which facilitates processing. The clearance chamber 11 is flared relative to the exhaust chamber 12, which also facilitates processing.

[0033] Reference Figures 1 to 3 In this embodiment, the air inlet 15 is connected to the air inlet chamber 14, the working port 17 is connected to the working chamber 13, and the exhaust port 16 is connected to the exhaust chamber 12, which facilitates the processing of the air inlet 15, the exhaust port 16, and the working port 17. The valve seat 8 is embedded into the air inlet chamber 14 from the lower opening, so the working chamber 13 and the air inlet 15 can only be connected through the air inlet channel in the valve seat 8. In this embodiment, the valve seat 8 closes the lower opening, and the lower cover 3 is connected to the valve body 1 and presses down on the valve seat 8, thereby preventing the valve seat 8 from falling off and improving the sealing effect.

[0034] Reference Figures 1 to 3 In this embodiment, the air intake channel in the valve seat 8 includes an axial air passage 81 arranged along the axial direction of the valve stem 4, and a radial air passage 83 communicating with the axial air passage 81. Preferably, the air intake channel includes a plurality of radial air passages 83 arranged around the axial air passage 81, and the outer wall of the valve seat 8 is provided with an air intake ring groove 82 communicating with the plurality of radial air passages 83. The air intake ring groove 82 is communicating with the air intake port 15. Gas enters the air intake ring groove 82 from the air intake port 15, and then enters the axial air passage 81 through the plurality of radial air passages 83, and then enters the working chamber 13 from the axial air passage 81. The arrangement of the axial air passage 81, the radial air passage 83 and the air intake ring groove 82 not only facilitates processing and effectively ensures gas flow, but also plays a buffering role and improves the stability of gas path control.

[0035] Reference Figures 1 to 3 In this embodiment, the valve stem 4 is inserted into the valve cavity and the axial air passage 81 from the upper opening, and the inner end face of the axial air passage 81 is provided with a guide hole 84 that is clearance-fitted with the end of the valve stem 4; the return spring 7 is embedded in the end of the valve stem 4 and contacts the inner end face of the guide hole 84; the setting of the guide hole 84 plays a guiding role in the movement of the valve stem 4, thereby improving the stability of the air circuit control.

[0036] Reference Figures 1 to 3 In this embodiment, a valve 6 located in the working chamber 13 is provided on the middle part of the valve stem 4, and the valve 6 moves synchronously with the valve stem 4; an air inlet 85 that mates with the lower end face of the valve 6 is provided at the opening of the axial air passage 81, and an exhaust 18 that mates with the upper end face of the valve 6 is provided in the working chamber 13; preferably, the valve 6 is made of elasto-plastic materials such as silicone rubber, fluororubber, modified PTFE, polyurethane or polypropylene, so as to improve the sealing effect.

[0037] Reference Figures 1 to 3 In this embodiment, the control diaphragm 5 is sleeved on the upper end of the valve stem 4, and the control diaphragm 5 closes the upper opening of the valve cavity; after the upper cover 2 is connected to the valve body 1, it presses down the edge of the control diaphragm 5; the upper cover 2 is provided with a control chamber 21 opposite to the control diaphragm 5, and a control air passage 22 communicating with the control chamber 21; the pilot solenoid valve 9 is installed on the outer end face of the upper cover 2 and communicates with the control air passage 22.

[0038] Reference Figures 1 to 3 After the pilot solenoid valve 9 is energized, gas is injected into the control chamber 21 through the control air passage 22. Under the action of air pressure, the control diaphragm 5 deforms and drives the valve stem 4 to move downward. The valve stem 4 drives the valve 6 to move, and the valve 6 opens the exhaust valve port 18 and moves to close the inlet valve port 85. At this time, the working port 17 is connected to the exhaust port 16, and the molecular sieve is in the exhaust state.

[0039] After the pilot solenoid valve 9 is de-energized, the gas in the control chamber 21 is discharged through the control air passage 22. The pressure difference on both sides of the control diaphragm 5 promotes its recovery deformation. The valve stem 4 moves upward under the combined force of the control diaphragm 5 and the return spring 7. The valve stem 4 drives the valve 6 to move, and the valve 6 opens the inlet valve port 85 and moves to close the exhaust valve port 18. At this time, the inlet port 15 is connected to the working port 17, and the compressed air enters the oxygen generation system through the working port 17.

[0040] When the oxygen generation system is shut down, the pilot solenoid valve 9 is de-energized, and the valve 6 seals the exhaust valve port 18, isolating the working port 17 from the exhaust port 16; thus, humid air from the outside cannot enter the molecular sieve of the oxygen generator through the exhaust port 16, thereby preventing the molecular sieve from getting damp and improving the life of the oxygen generator.

[0041] Reference Figures 1 to 3In this embodiment, the control diaphragm 5 serves two purposes: first, to seal the upper opening; and second, to move the valve stem 4. This reduces the number of parts, facilitates assembly, and improves response speed. Preferably, the control diaphragm 5 is provided with a reinforcing ring 51. The reinforcing ring 51 has a protrusion on the side facing the control chamber 21 and a groove on the side facing the relief chamber 11. The reinforcing ring 51 improves the deformation capability of the control diaphragm 5. In this embodiment, the reciprocating motion of the valve stem 4 can be achieved using only the control diaphragm 5. Considering that the deformation capability of the control diaphragm 5 may decrease after long-term use, a return spring 7 is used to promote the return of the valve stem 4, thereby extending the service life of the solenoid valve. Example 2:

[0042] An oxygen concentrator, as described above Figures 1 to 3 It includes the solenoid valve for the oxygen generator in Example 1.

Claims

1. A solenoid valve for an oxygen concentrator, characterized in that: The valve includes a valve body, a valve stem, and a valve seat. The valve body has a valve cavity and an air inlet, a working port, and an exhaust port that are respectively connected to the valve cavity. The valve cavity has an upper opening and a lower opening at both ends. The valve seat is embedded into the valve cavity through the lower opening, and the valve seat has an air inlet channel that connects the air inlet and the valve cavity.

2. The solenoid valve for an oxygen concentrator according to claim 1, characterized in that: The intake passage includes an axial air passage arranged along the valve stem axis and a radial air passage communicating with the axial air passage.

3. The solenoid valve for an oxygen concentrator according to claim 2, characterized in that: The intake passage includes multiple radial air passages arranged around the axial air passage.

4. The solenoid valve for an oxygen concentrator according to claim 3, characterized in that: The outer wall of the valve seat is provided with an air inlet ring groove that connects multiple radial air passages, and the air inlet ring groove is connected to the air inlet.

5. The solenoid valve for an oxygen concentrator according to claim 2, characterized in that: The inner end face of the axial air passage is provided with a guide hole that is clearance-fitted to the end of the valve stem.

6. The solenoid valve for an oxygen concentrator according to claim 2, characterized in that: The valve chamber includes a working chamber that connects the axial channel and the working port, and an exhaust chamber that connects the working chamber and the exhaust port. The valve stem is equipped with a valve located in the working chamber; An air inlet valve port that cooperates with a valve is provided at the opening of the axial channel, and an exhaust valve port that cooperates with a valve is provided in the working chamber.

7. The solenoid valve for an oxygen concentrator according to claim 6, characterized in that: The valve stem is also provided with a control diaphragm, which closes the upper opening of the valve cavity; the valve cavity also includes a relief chamber that cooperates with the control diaphragm, and the relief chamber is connected to the exhaust chamber.

8. The solenoid valve for an oxygen concentrator according to claim 7, characterized in that: The solenoid valve for the oxygen generator also includes an upper cover that presses down on the edge of the control diaphragm, and a pilot solenoid valve disposed on the upper cover; the upper cover is provided with a control chamber opposite to the control diaphragm, and a control air passage connecting the control chamber and the pilot solenoid valve; When the pilot solenoid valve is energized, gas is injected into the control chamber, causing the control diaphragm to deform and drive the valve stem to move away from the top cover. Then the valve opens the exhaust valve port and moves to close the intake valve port. After the pilot solenoid valve is de-energized, the gas in the control chamber is discharged. The pressure difference on both sides of the control diaphragm promotes its recovery of deformation. The control diaphragm drives the valve stem to move in the direction closer to the upper cover, and the valve opens the air inlet valve port and moves to close the exhaust valve port.

9. The solenoid valve for an oxygen concentrator according to claim 7, characterized in that: The control diaphragm is provided with a reinforcing ring; the reinforcing ring has a protrusion on the side facing the control chamber and a groove on the side facing the relief chamber.

10. An oxygen generator, characterized in that: The solenoid valve for an oxygen generator includes any one of claims 1-9.

Images