Electromagnetic valve of oxygen generator

Abstract

The utility model discloses an oxygen generator solenoid valve, including valve body and pilot head subassembly, valve body includes air inlet, work mouth and exhaust port, still have the first valve port and second valve port in the valve body, the valve rod is movably arranged in the valve body, the first sealing washer and second sealing washer are fixedly arranged on the valve rod, and the pilot head subassembly is used for controlling the valve rod and moves between the first station and the second station, and the pilot head subassembly includes coil, static iron core and moving iron core, and the moving iron core is integrally formed with the valve rod, and the valve rod still is equipped with spring, under normal circumstances, the valve rod is located the first station, and the first sealing washer is sealedly cooperated with the first valve port, and the second sealing washer forms the clearance with the second valve port, when the pilot head subassembly is electrified, the valve rod switches to the second station, and the first sealing washer forms the clearance with the first valve port, and the second sealing washer is sealedly cooperated with the second valve port, is set to the normally open valve, is applicable to the high altitude area or the environment scene of rarefied air, and the valve rod action is driven through the electromagnetic force, and the reaction speed is fast.

Description

Technical Field

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

[0002] The solenoid valve in an oxygen concentrator plays a crucial role in oxygen production equipment, primarily responsible for functions such as gas on / off control and flow direction switching. It controls the direction and flow rate of oxygen, and its performance directly affects the efficiency and stability of the entire oxygen production system. Common oxygen concentrator solenoid valves typically employ diaphragm-type solenoid valves. The structure of a diaphragm-type oxygen concentrator solenoid valve is as follows... Figure 4 As shown, the solenoid valve of this diaphragm oxygen concentrator is a normally closed valve. Its structure mainly includes a valve body 1' and a pilot assembly 3'. The valve body 1' is provided with an air inlet, a working port 11', and an exhaust port. A first valve port 12' is provided between the air inlet and the working port 11', and a second valve port 13' is provided between the working port 11' and the exhaust port. A valve stem 2' is movably installed inside the valve body 1', and an upper diaphragm 21' is connected to the upper end of the valve stem 2'. The upper diaphragm 21' is used for sealing. The second valve port 13' has a lower diaphragm 22' used to seal the first valve port 12'. The lower end of the valve stem 2' is connected to the lower diaphragm 22'. The valve body 1' has an upper chamber 14' above the upper diaphragm 21' and a lower chamber 15' below the lower diaphragm 22'. The lower chamber 15' is connected to the air inlet. The pilot assembly 3' has a pilot chamber 31'. The upper chamber 14' is connected to the pilot chamber 31'. The pilot assembly 3' is connected to the pilot gas. Pilot gas flows through the pilot channel in the pilot assembly 3' to the pilot chamber 31'. The pilot assembly 3' is used to control the opening and closing of the pilot channel. When the pilot assembly 3' is energized, the pilot channel opens, the pilot gas flows into the pilot chamber 31' and enters the upper chamber 14'. The upper diaphragm 21' is pressed and pushes the valve stem 2' downward, so that the upper diaphragm 21' seals the second valve port 13'. A gap is formed between the lower diaphragm 22' and the first valve port 12', and the first valve port 12' opens, allowing the inlet gas to enter the working port 11'. When the pilot assembly 3' is de-energized, the pilot channel closes, the gas in the upper chamber 14' is discharged through the exhaust channel 32' in the pilot assembly 3', the pressure in the upper chamber 14' decreases, the valve stem 2' resets under the pressure of the inlet, and the lower diaphragm 22' seals the first valve port 12'. A gap is formed between the upper diaphragm 21' and the second valve port 13', and the gas in the working port 11' flows out through the exhaust port.

[0003] However, the aforementioned diaphragm-type oxygen concentrator solenoid valve has some obvious defects. First, the valve can only work normally under air pressure, that is, pilot air needs to enter for the solenoid valve to work. In some special environments, especially in high-altitude areas, due to the thin air and insufficient gas pressure, it may be impossible to effectively control the movement of valve stem 2'. Second, since pilot air is required to fill the upper chamber 14' before valve stem 2' can move, its response speed is relatively slow, affecting working efficiency. In addition, during the downward movement of valve stem 2', while the first valve port 12' opens, the second valve port 13' may not be completely closed, causing the intake pressure to connect with the exhaust chamber. Some compressed air will be lost to the exhaust chamber and will not be fully entered into the working port 11', thus causing air loss. Furthermore, during the reset or operation of the diaphragm, the gas acting on the diaphragm can easily generate noise. Therefore, it is necessary to improve it. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings and deficiencies of existing technologies by providing an oxygen generator solenoid valve with a simple and reasonable structure and convenient operation. The solenoid valve is set as a normally open valve, which is suitable for high-altitude areas or environments with thin air. It can ensure the continuity and stability of oxygen supply. The valve stem is driven by electromagnetic force, and the response speed is fast, thereby effectively improving the operating efficiency of the oxygen generator. In addition, since the diaphragm structure is eliminated, the gas loss is significantly reduced, and the knocking sound generated by the diaphragm during operation is fundamentally eliminated.

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

[0006] This utility model discloses an oxygen generator solenoid valve, comprising a valve body and a pilot head assembly. The valve body includes an air inlet, a working port, and an exhaust port. The valve body also has a first valve port for connecting the exhaust port and the working port, and a second valve port for connecting the air inlet and the working port. A valve stem is movably disposed within the valve body. A first sealing gasket corresponding to the first valve port and a second sealing gasket corresponding to the second valve port are fixedly disposed on the valve stem. The pilot head assembly controls the movement of the valve stem between a first position and a second position. The pilot head assembly includes... The valve includes a coil, a stationary iron core, and a moving iron core. The stationary iron core is fixedly installed inside the coil, while the moving iron core is movably installed inside the coil and cooperates with the stationary iron core. The moving iron core is integrally formed with the valve stem, and the valve stem is also equipped with a spring. The spring has a tendency to move the moving iron core away from the stationary iron core. Under normal conditions, the valve stem is located in the first position, with the first sealing gasket sealing with the first valve port and a gap forming between the second sealing gasket and the second valve port. When the pilot head assembly is energized, the valve stem switches to the second position, with a gap forming between the first sealing gasket and the first valve port, and the second sealing gasket sealing with the second valve port.

[0007] Furthermore, the upper end of the moving iron core is provided with an outer conical surface, and the lower end of the stationary iron core is provided with an inner conical surface that cooperates with the outer conical surface.

[0008] Furthermore, a spacer is fixedly installed inside the valve body, and the spacer is provided with a first valve port and a second valve port. The spacer is also provided with a first through hole communicating with the working port and a second through hole communicating with the exhaust port.

[0009] Furthermore, the valve body is provided with an installation step that cooperates with the spacer for limiting.

[0010] Furthermore, a plurality of first sealing rings are provided between the spacer and the valve body.

[0011] Furthermore, the area of ​​the upper end surface of the first sealing gasket is equal to the area of ​​the lower end surface of the first sealing gasket.

[0012] Furthermore, the area of ​​the upper end face of the second sealing gasket is equal to the area of ​​the lower end face of the second sealing gasket.

[0013] Furthermore, the pilot head assembly also includes a magnetic shielding sleeve, the coil is sleeved outside the magnetic shielding sleeve, the stationary iron core is fixedly disposed inside the magnetic shielding sleeve, the moving iron core is movably disposed inside the magnetic shielding sleeve, and the moving iron core is positioned below the stationary iron core.

[0014] Furthermore, the moving iron core is provided with a stepped portion below the magnetic shielding sleeve, and the spring is sleeved on the outside of the stepped portion. The upper end of the spring abuts against the magnetic shielding sleeve, and the lower end of the spring abuts against the end face of the stepped portion.

[0015] Furthermore, the spring is a pagoda spring.

[0016] The beneficial effects of this utility model are as follows: The oxygen generator solenoid valve of this utility model does not use a traditional diaphragm structure to transmit power. Instead, it drives the valve stem through electromagnetic force, resulting in a fast response speed and effectively improving the operating efficiency of the oxygen generator. Furthermore, by eliminating the diaphragm structure, the losses during gas flow are significantly reduced. Compared to diaphragm valves, its gas loss is significantly reduced, further enhancing the overall performance of the system. Eliminating the diaphragm also fundamentally eliminates the slapping noise generated during operation. In addition, the oxygen generator solenoid valve of this utility model is designed as a normally open valve, suitable for high-altitude areas or environments with thin air. Under these special conditions, the normally open valve ensures the continuity and stability of oxygen supply, effectively meeting the urgent oxygen demand in high-altitude areas or environments with thin air.

[0017] The moving iron core and valve stem are integrally formed, which is convenient to process. When the coil is energized, the solenoid valve can be directly started. The upper end surface area of ​​the first sealing gasket is equal to the lower end surface area of ​​the first sealing gasket, and the upper end surface area of ​​the second sealing gasket is equal to the lower end surface area of ​​the second sealing gasket. When the valve stem moves, it will not be affected by the air pressure and flow rate in the valve body. The back pressure-free design eliminates the axial force of air pressure on the valve stem. The valve stem movement is only affected by the spring force and the electromagnetic attraction of the coil. It has the advantages of high response speed, low power consumption and long life. Attached Figure Description

[0018] Figure 1 This is a first cross-sectional structural diagram of the present invention;

[0019] Figure 2 yes Figure 1 Enlarged structural diagram at point A;

[0020] Figure 3 This is a schematic diagram of the second cross-sectional structure of this utility model;

[0021] Figure 4 This is a cross-sectional structural diagram of the solenoid valve in a diaphragm oxygen generator in the prior art.

[0022] Figures 1-4 In the middle section: 1', valve body; 11', working port; 12', first valve port; 13', second valve port; 14', upper chamber; 15', lower chamber; 2', valve stem; 21', upper diaphragm; 22', lower diaphragm; 3', pilot assembly; 31', pilot chamber; 32', exhaust passage; 1. Valve body; 11, air inlet; 12, working port; 13, exhaust port; 14, mounting step; 2. Valve stem; 21, platform 211. Step; 22. Spring; 23. First sealing gasket; 24. Second sealing gasket; 3. Pilot head assembly; 31. Coil; 32. Magnetic shielding sleeve; 321. Stationary iron core; 3211. Inner conical surface; 322. Moving iron core; 3221. Outer conical surface; 323. Second sealing ring; 4. Spacer; 41. First valve port; 42. Second valve port; 43. First through hole; 44. Second through hole; 45. First sealing ring. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings.

[0024] like Figures 1-3The solenoid valve for an oxygen concentrator shown includes a valve body 1 and a pilot head assembly 3. The valve body 1 includes an air inlet 11, a working port 12, and an exhaust port 13. A first valve port 41 and a second valve port 42 are also provided within the valve body 1. The first valve port 41 connects the exhaust port 13 and the working port 12, and the second valve port 42 connects the air inlet 11 and the working port 12. A valve stem 2 is movably disposed within the valve body 1. A first sealing gasket 22 corresponding to the first valve port 41 and a second sealing gasket 23 corresponding to the second valve port 42 are fixedly disposed on the valve stem 2. The pilot head assembly 3 is used to control the valve stem 2 in the first and second working positions. The pilot head assembly 3, which moves between workstations, includes a coil 31, a stationary iron core 321, and a moving iron core 322. The stationary iron core 321 is fixedly installed inside the coil 31, and the moving iron core 322 is movably installed inside the coil 31 and cooperates with the stationary iron core 321. The moving iron core 322 is integrally formed with the valve stem 2, which is easy to process. When the coil 31 is energized, the solenoid valve can be directly activated. The valve stem 2 is also provided with a spring 211, which has a tendency to move the moving iron core 322 away from the stationary iron core 321. Specifically, the oxygen generator solenoid valve described in this utility model is a normally open valve, which is suitable for high-altitude areas or thin air environments. Under normal conditions, valve stem 2 is in the first position, the first sealing gasket 22 is sealed to the first valve port 41, the first valve port 41 is closed, a gap is formed between the second sealing gasket 23 and the second valve port 42, the second valve port 42 is open, the air inlet 11 is connected to the working port 12, and the working port 12 is disconnected from the exhaust port 13. When the pilot head assembly 3 is energized, the coil 31 is energized, generating a magnetic field. The moving iron core 322 is affected by electromagnetic attraction, overcomes the elastic force of the spring 211 and moves upward. The moving iron core 322 moves closer to the stationary iron core 321, and valve stem 2 switches to the second position. A gap is formed between the first sealing gasket 22 and the first valve port 41, the first valve port 41 is open, the second sealing gasket 23 is sealed to the second valve port 42, the second valve port 42 is closed, the air inlet 11 is disconnected from the working port 12, and the working port 12 is connected to the exhaust port 13. When the coil 31 is de-energized, valve stem 2 and moving iron core 322 are reset under the action of spring 211.

[0025] Specifically, the lower end face of the first sealing gasket 22 is sealed to the first valve port 41, and the upper end face of the second sealing gasket 23 is sealed to the second valve port 42.

[0026] Specifically, a spacer 4 is fixedly installed inside the valve body 1, and the spacer 4 is provided with the first valve port 41 and the second valve port 42, see reference. Figure 1 and Figure 3 The spacer 4 is also provided with a first through hole 43 connected to the working port 12 and a second through hole 44 connected to the exhaust port 13.

[0027] Preferably, the valve body 1 is provided with an installation step 14 that cooperates with the spacer 4 for limiting, and a plurality of first sealing rings 45 are provided between the spacer 4 and the valve body 1 to play a sealing role and prevent air leakage.

[0028] Specifically, see Figure 2 The spring 211 is a pagoda spring 211. The helical design of the pagoda spring 211, which decreases layer by layer, enables the spring 211 to provide a more uniform and stable elastic force during compression, effectively avoiding the deformation or damage caused by uneven force on the traditional spring 211.

[0029] Preferably, see Figure 1 The upper end of the moving iron core 322 is provided with an outer conical surface 3221, and the lower end of the stationary iron core 321 is provided with an inner conical surface 3211 that cooperates with the outer conical surface 3221. The design of the inner and outer conical surfaces 3221 cooperating with each other can significantly increase the movement stroke of the moving iron core 322. With the increase in the stroke of the moving iron core 322, the diameter of the first valve port 41 and the second valve port 42 can be increased accordingly to meet the demand for large flow.

[0030] Specifically, the upper and lower surface areas of the first sealing gasket 22 are equal, and the upper and lower surface areas of the second sealing gasket 23 are equal. When the valve stem 2 moves, it will not be affected by the air pressure and flow rate inside the valve body 1. The back pressure-free design eliminates the axial force of air pressure on the valve stem 2. The movement of the valve stem 2 is only affected by the elastic force of the spring 211 and the electromagnetic attraction of the coil 31. It has the advantages of high response speed, low power consumption and long life.

[0031] Preferably, see Figure 1 and Figure 3 The pilot head assembly 3 also includes a magnetic shielding sleeve 32. The coil 31 is sleeved on the outside of the magnetic shielding sleeve 32. The stationary iron core 321 is fixedly installed inside the magnetic shielding sleeve 32. The moving iron core 322 is movably installed inside the magnetic shielding sleeve 32. The moving iron core 322 is placed below the stationary iron core 321. The magnetic shielding sleeve 32 can limit magnetic field leakage and ensure that the magnetic field energy is concentrated to drive the moving iron core 322 to move, thereby reducing the power consumption of the solenoid valve and realizing the function of fast response. Preferably, a second sealing ring 323 is provided between the spacer 4 and the magnetic shielding sleeve 32 to seal and prevent air leakage.

[0032] Preferably, see Figure 2 The moving iron core 322 is provided with a step portion 21 below the magnetic shielding sleeve 32. The spring 211 is sleeved on the step portion 21. The upper end of the spring 211 abuts against the lower end face of the magnetic shielding sleeve 32, and the lower end of the spring 211 abuts against the end face of the step portion 21, which plays the role of supporting the spring 211 and ensuring the stability and reliability of the spring 211.

[0033] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. An oxygen generator solenoid valve, comprising a valve body (1) and a pilot head assembly (3), wherein the valve body (1) includes an air inlet (11), a working port (12) and an exhaust port (13), and the valve body (1) is further provided with a first valve port (41) for connecting the exhaust port (13) and the working port (12) and a second valve port (42) for connecting the air inlet (11) and the working port (12), characterized in that: A valve stem (2) is movably disposed within the valve body (1). A first sealing gasket (22) corresponding to the first valve port (41) and a second sealing gasket (23) corresponding to the second valve port (42) are fixedly disposed on the valve stem (2). A pilot head assembly (3) is used to control the movement of the valve stem (2) between the first and second working positions. The pilot head assembly (3) includes a coil (31), a stationary iron core (321), and a moving iron core (322). The stationary iron core (321) is fixedly disposed within the coil (31), and the moving iron core (322) is movably disposed within the coil (31) and cooperates with the stationary iron core (321). The iron core (322) and the valve stem (2) are integrally formed. The valve stem (2) is also provided with a spring (211). The spring (211) has a tendency to move the moving iron core (322) away from the stationary iron core (321). Under normal conditions, the valve stem (2) is located in the first position. The first sealing gasket (22) is sealed and fitted with the first valve port (41). A gap is formed between the second sealing gasket (23) and the second valve port (42). When the pilot head assembly (3) is energized, the valve stem (2) switches to the second position. A gap is formed between the first sealing gasket (22) and the first valve port (41). The second sealing gasket (23) is sealed and fitted with the second valve port (42).

2. The solenoid valve for an oxygen generator according to claim 1, characterized in that: The upper end of the moving iron core (322) is provided with an outer conical surface (3221), and the lower end of the stationary iron core (321) is provided with an inner conical surface (3211) that cooperates with the outer conical surface (3221).

3. The solenoid valve for an oxygen generator according to claim 1, characterized in that: A spacer (4) is fixedly provided inside the valve body (1). The spacer (4) is provided with the first valve port (41) and the second valve port (42). The spacer (4) is also provided with a first through hole (43) connected to the working port (12) and a second through hole (44) connected to the exhaust port (13).

4. The solenoid valve for an oxygen generator according to claim 3, characterized in that: The valve body (1) is provided with an installation step (14) that is matched with the spacer (4) for positioning.

5. The solenoid valve for an oxygen generator according to claim 3, characterized in that: A plurality of first sealing rings (45) are provided between the spacer (4) and the valve body (1).

6. The solenoid valve for an oxygen generator according to claim 1, characterized in that: The area of ​​the upper end surface of the first sealing gasket (22) is equal to the area of ​​the lower end surface of the first sealing gasket (22).

7. The solenoid valve for an oxygen generator according to claim 1, characterized in that: The upper surface area of ​​the second sealing gasket (23) is equal to the lower surface area of ​​the second sealing gasket (23).

8. The solenoid valve for an oxygen generator according to claim 1, characterized in that: The pilot head assembly (3) also includes a magnetic shielding sleeve (32), the coil (31) is sleeved on the outside of the magnetic shielding sleeve (32), the stationary iron core (321) is fixedly installed inside the magnetic shielding sleeve (32), the moving iron core (322) is movably installed inside the magnetic shielding sleeve (32), and the moving iron core (322) is placed below the stationary iron core (321).

9. The solenoid valve for an oxygen generator according to claim 8, characterized in that: The moving iron core (322) is provided with a step portion (21) below the magnetic shielding sleeve (32). The spring (211) is sleeved on the outside of the step portion (21). The upper end of the spring (211) abuts against the magnetic shielding sleeve (32), and the lower end of the spring (211) abuts against the end face of the step portion (21).

10. An oxygen generator solenoid valve according to claim 1, characterized in that: The spring (211) is a pagoda spring (211).

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