Normally open solenoid valve for oxygen generator

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to a normally-open electromagnetic valve for an oxygen generator, and solves the problems that a double-diaphragm or single-diaphragm type normally-closed electromagnetic valve in the prior art is loud in noise and a system is easily affected with damp when the oxygen generator is operated. A normally open solenoid valve for an oxygen generator comprises a valve body, two identical valve cavities are formed in the valve body and share an air inlet and an air outlet, the valve body is further provided with an air inlet valve port, an air outlet valve port, a first working port and a second working port, and an air cylinder, a piston, a Yx sealing ring, a valve rod, a valve fixedly connected with the valve rod and a valve sleeve used for sliding with the upper end of the valve rod are arranged in each valve cavity. The lower end of the valve sleeve is provided with an exhaust valve port. According to the utility model, the operation noise is reduced by canceling a diaphragm structure, damp air is prevented from entering the system during shutdown by adopting a normally open design, the molecular sieve is prevented from being damped, the service life of equipment is prolonged, the operation stability and the user experience are improved, and a more efficient and reliable solution is provided for the oxygen generator industry.

Description

Technical Field

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

[0002] An oxygen concentrator is a device that separates oxygen from the air and is widely used in medical, healthcare, and other fields. It plays an indispensable role, especially in situations requiring high-purity oxygen therapy or emergency care. It utilizes physical adsorption principles, such as pressure swing adsorption (PSA) technology, using zeolite molecular sieves as adsorbents to adsorb nitrogen from the air and release oxygen. In this process, the solenoid valve, as a key component controlling gas flow, has a decisive impact on the overall efficiency and lifespan of the oxygen concentrator. Particularly for small medical and home oxygen concentrators, the choice of solenoid valve directly affects the equipment's operating noise, energy consumption, and maintenance frequency. The normally open solenoid valve, as a key component in oxygen concentrators, occupies an important position in oxygen production equipment. As a core component for precisely controlling gas flow, its performance has a decisive impact on the overall equipment's quietness, energy efficiency ratio, and ease of maintenance. Especially in the core process of pressure swing adsorption, existing dual-diaphragm or single-diaphragm normally closed solenoid valves are gradually revealing significant limitations when handling continuous oxygen production needs.

[0003] Specifically, existing dual-diaphragm or single-diaphragm normally closed solenoid valves face significant problems in actual oxygen concentrator operation, such as high operating noise and susceptibility to moisture. These issues directly lead to a reduced user experience, shortened equipment lifespan, and failure to meet users' expectations for low noise and high stability. More seriously, these designs not only significantly increase user discomfort but may also cause molecular sieves to fail due to moisture, greatly reducing the reliability and lifespan of the oxygen concentrator.

[0004] Therefore, to address the shortcomings of existing technologies, we urgently need a normally open solenoid valve for oxygen concentrators. A normally open solenoid valve not only reduces operating noise but also effectively prevents humid air from entering the system, thereby extending the service life of the equipment and its key components, and providing strong support for the continued development of the oxygen concentrator industry. Utility Model Content

[0005] The purpose of this invention is to provide a normally open solenoid valve for oxygen concentrators, which solves the problems of high operating noise and easy moisture absorption in existing double-diaphragm or single-diaphragm normally closed solenoid valves in actual oxygen concentrator operation scenarios.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A normally open solenoid valve for an oxygen concentrator includes a valve body with two identical valve chambers formed within it, sharing an inlet and an outlet. The valve body also includes an inlet valve port, an outlet valve port, and two working ports. Each valve chamber contains a cylinder, a piston, a Yx sealing ring, a valve stem, and a valve sleeve fixedly connected to it, for sliding against the upper end of the valve stem. An outlet valve port is located at the lower end of the valve sleeve, and an inlet valve port with a return spring is located at the bottom of the valve chamber. A valve cover is provided on the valve body, and a two-position three-way pilot solenoid valve is installed inside the valve cover to control the air inlet and outlet. The valve cover is fixed by valve cover connecting screws, and the two-position three-way pilot solenoid valve is fixed by two-position three-way pilot solenoid valve connecting screws.

[0008] Preferably, the valve cover is equipped with two sets of two-position three-way pilot solenoid valves corresponding to the two sets of valve chambers; a valve is provided in the middle of the valve stem, and a mounting hole or mounting post for a return spring is provided in the lower part of the valve stem; a pressure relief straight hole and a horizontal hole are also provided in the upper part of the valve stem, and they are interconnected; the guide hole and the valve stem guide hole are used to guide the movement of the valve stem.

[0009] Preferably, the upper end of the valve stem forms a clearance sliding pair with the valve sleeve guide hole, the middle part of the valve stem is provided with a valve, and the lower end of the valve stem forms a clearance sliding pair with the valve stem guide hole of the valve cavity; the lower end of the valve sleeve is provided with an exhaust valve port, and the bottom of the valve cavity is provided with an air inlet valve port; the valve stem is provided with a mounting hole or mounting post for mounting a return spring, and the lower end of the valve stem is connected to the air inlet.

[0010] Preferably, the valve gasket material is fluororubber, modified PTFE, polyurethane, or polypropylene; the valve cover is fixed by valve cover connecting screws, and the two-position three-way pilot solenoid valve is fixed by two-position three-way pilot solenoid valve connecting screws; the guide hole and valve stem guide hole are used to guide the movement of the valve stem.

[0011] Preferably, the upper part of the valve stem is further provided with a pressure relief straight hole and a horizontal hole, which are interconnected; the middle part of the valve stem is provided with a valve, and the lower part of the valve stem is provided with a mounting hole or mounting post for a return spring; the guide hole and the valve stem guide hole are used to guide the movement of the valve stem.

[0012] Preferably, the valve cover is equipped with two sets of two-position three-way pilot solenoid valves corresponding to the two sets of valve chambers; the upper end of the valve stem forms a clearance sliding pair with the valve sleeve guide hole, the middle part of the valve stem is provided with a valve, and the lower end of the valve stem forms a clearance sliding pair with the valve stem guide hole of the valve chamber; the lower end of the valve sleeve is provided with an exhaust valve port, and the bottom of the valve chamber is provided with an air inlet valve port; the valve stem is provided with a mounting hole or mounting post for the installation of a return spring, and the lower end of the valve stem is connected to the air inlet.

[0013] This utility model has the following beneficial effects:

[0014] By eliminating the traditional diaphragm and rubber ring structure and adopting a clearance fit between the valve stem, valve sleeve, and valve body, the impact of gas flow on the diaphragm is effectively reduced, thus significantly reducing operating noise and improving the user experience. Secondly, the normally open solenoid valve design allows the valve to automatically close the exhaust port when the oxygen generator stops running, preventing external humid air from entering the system through the exhaust port, avoiding molecular sieve failure due to moisture, extending the service life of the equipment and its key components, and improving the reliability and stability of the oxygen generator. Furthermore, the valve located in the middle of the valve stem can quickly close the exhaust port after pressure loss due to the elasticity of the return spring, ensuring the system's immediate response capability and further enhancing equipment safety. In addition, the valve gasket uses high-performance materials such as fluororubber and modified PTFE, which not only enhances sealing performance but also improves corrosion resistance and durability, reducing the risk of failure due to material aging. Finally, the valve cover and the two-position three-way pilot solenoid valve are fixed by valve cover connecting screws and two-position three-way pilot solenoid valve connecting screws, respectively, simplifying the installation and maintenance process, reducing operating costs, and providing users with a more convenient and efficient solution. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the valve cover and the two-position three-way pilot solenoid valve of this utility model;

[0018] Figure 3 This is a schematic diagram of the guide hole and working hole structure of this utility model.

[0019] In the diagram: 1. Valve cover; 2. Three-way pilot solenoid valve controls the air inlet and outlet; 3. Cylinder; 4. Yx sealing ring; 5. Piston; 6. Guide hole; 7. Valve sleeve; 8. Valve stem; 9. Exhaust valve port; 10. Working port one; 11. Valve; 12. Inlet valve port; 13. Valve stem guide hole; 14. Return spring; 15. Inlet; 16. Exhaust port; 17. Working port two; 18. Two-position three-way pilot solenoid valve; 19. Valve cover connecting screw; 20. Two-position three-way pilot solenoid valve connecting screw; 21. Valve chamber; 22. Valve body; 23. Straight hole; 24. Horizontal hole. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Example 1

[0022] Please see Figure 1-3 As shown, a normally open solenoid valve for an oxygen concentrator in this embodiment includes a valve body 22, which has two identical valve chambers 21 formed inside, sharing an inlet 15 and an outlet 16. The valve body 22 is also provided with an inlet valve port 12, an outlet valve port 9, a working port 10, and a working port 27. A cylinder 3, a piston 5, a Yx sealing ring 4, a valve stem 8, and a valve 11 fixed thereto are provided in the valve chamber 21, and a valve sleeve 7 is used to slide with the upper end of the valve stem 8. An outlet valve port 9 is provided at the lower end of the valve sleeve 7, and an inlet valve port 12 is provided at the bottom of the valve chamber 21 and a return spring 14 is installed. A valve cover 1 is provided on the valve body 22, and a two-position three-way pilot solenoid valve 18 is provided inside the valve cover 1 to control the air inlet and outlet 2. The valve cover 1 is fixed by a valve cover connecting screw 19, and the two-position three-way pilot solenoid valve 18 is fixed by a two-position three-way pilot solenoid valve connecting screw 20.

[0023] First, compressed gas is introduced into the two identical valve chambers 21 of the valve body 22 through the inlet 15, and then enters the system through the inlet valve 12. When the two-position three-way pilot solenoid valve 18 is energized, control gas enters the cylinder 3 through the control gas inlet / outlet 2 of the three-way pilot solenoid valve, pushing the piston 5 downward, which in turn moves the valve stem 8 and valve 11 fixed thereto downward. At this time, the valve 11 closes the inlet valve 12 and opens the exhaust valve 9, so that the working port 10 or the working port 17 is connected to the exhaust port 16, thereby realizing the gas discharge process from the adsorption tower. When the two-position three-way pilot solenoid valve 18 is de-energized, the control gas in the cylinder 3 is discharged through the control gas inlet / outlet 2 of the three-way pilot solenoid valve. The force of the return spring 14 causes the valve stem 8, piston 5 and valve 11 to move upward, opening the inlet valve 12 and closing the exhaust valve 9, completing the switching of gas flow direction. During this process, the exhaust valve port 9 at the lower end of the valve sleeve 7 and the intake valve port 12 at the bottom of the valve chamber 21 cooperate with the sliding action of the valve stem 8 to ensure precise control of the gas flow path; while the guide hole 6 and the valve stem guide hole 13 ensure the smooth operation of the valve stem 8. In addition, the valve cover 1 is fixed by the valve cover connecting screw 19, and the two-position three-way pilot solenoid valve 18 is fixed by the two-position three-way pilot solenoid valve connecting screw 20 to ensure the stability and reliability of the overall structure.

[0024] Example 2

[0025] Please see Figure 1-3As shown, in this embodiment, a normally open solenoid valve for an oxygen concentrator has two sets of two-position three-way pilot solenoid valves 18 corresponding to two sets of valve chambers 21 mounted on the valve cover 1; a valve 11 is provided in the middle of the valve stem 8, and a mounting hole 25 or mounting post 26 for a return spring 14 is provided at the lower part of the valve stem 8; a pressure relief straight hole 23 and a horizontal hole 24 are also provided at the upper part of the valve stem 8, and they are interconnected; a guide hole 6 and a valve stem guide hole 13 are used to guide the movement of the valve stem 8. Specifically, the valve cover 1 is equipped with two sets of two-position three-way pilot solenoid valves 18 corresponding to two sets of valve chambers 21. The design incorporates two sets of two-position three-way pilot solenoid valves 18, a valve 11 located in the middle of the valve stem 8, a return spring 14 mounting hole 25 or mounting post 26 located at the lower part of the valve stem 8, and a pressure relief straight hole 23 and a horizontal hole 24 located at the upper part of the valve stem 8. When the two-position three-way pilot solenoid valves 18 are energized, the control gas pushes the piston 5, causing the valve stem 8 and valve 11 to move, completing the gas flow direction switching. Simultaneously, the pressure relief straight hole 23 and horizontal hole 24 can quickly discharge back pressure gas, making the movement of the valve stem 8 more rapid and stable. This design optimizes the switching efficiency of the gas flow path, achieving the effect of improving the response speed and operational stability of the solenoid valve.

[0026] The gasket material for valve 11 is fluororubber, modified PTFE, polyurethane, or polypropylene. Valve cover 1 is fixed by valve cover connecting screw 19, and the two-position three-way pilot solenoid valve 18 is fixed by two-position three-way pilot solenoid valve connecting screw 20. Guide hole 6 and valve stem guide hole 13 guide the movement of valve stem 8. Specifically, the choice of gasket material for valve 11 (fluororubber, modified PTFE, polyurethane, or polypropylene), the fixing of valve cover 1 by valve cover connecting screw 19, and the fixing of two-position three-way pilot solenoid valve 18 by two-position three-way pilot solenoid valve connecting screw 20, combined with the guide hole 6 and valve stem guide hole 13 for guiding the movement of valve stem 8, enhances sealing performance and corrosion resistance. The screw fixing method simplifies assembly and maintenance, while the guide hole 6 and valve stem guide hole 13 ensure smooth operation of valve stem 8. This design significantly improves the sealing performance and reliability of the solenoid valve, achieving the effects of reducing maintenance costs and improving overall performance.

[0027] Example 3

[0028] Please see Figure 1-3As shown in this embodiment, a normally open solenoid valve for an oxygen generator has a valve stem 8. The upper end of the valve stem 8 forms a sliding pair with the guide hole of the valve sleeve 7. A valve 11 is provided in the middle of the valve stem 8. The lower end of the valve stem 8 forms a sliding pair with the valve stem guide hole 13 of the valve cavity 21. An exhaust valve port 9 is provided at the lower end of the valve sleeve 7. An intake valve port 12 is provided at the bottom of the valve cavity 21. The valve stem 8 is provided with a mounting hole 25 or a mounting post 26 for the installation of a return spring 14. The lower end of the valve stem 8 is connected to the intake port 15. Specifically, through the sliding pair formed by the upper end of the valve stem 8 and the guide hole of the valve sleeve 7, the valve 11 provided in the middle of the valve stem 8, the sliding pair formed by the lower end of the valve stem 8 and the valve stem guide hole 13 of the valve cavity 21, and the mounting hole 25 or mounting post 26 provided on the valve stem 8 for the installation of the return spring 14, the valve stem 8 can achieve high-precision sliding under the guidance of the guide hole 6 and the valve stem guide hole 13 during the operation of the solenoid valve, ensuring the precise control of the intake valve port 12 and the exhaust valve port 9 by the valve 11. This design improves the movement accuracy and stability of valve stem 8, thereby reducing mechanical wear and extending the service life of the equipment.

[0029] The upper part of the valve stem 8 is also provided with a pressure relief straight hole 23 and a horizontal hole 24, which are interconnected; the middle part of the valve stem 8 is provided with a valve 11, and the lower part of the valve stem 8 is provided with a mounting hole 25 or mounting post 26 for a return spring 14; the guide hole 6 and the valve stem guide hole 13 are used to guide the movement of the valve stem 8. Specifically, the pressure relief straight hole 23 and the horizontal hole 24 on the upper part of the valve stem 8 are interconnected, and the valve 11 on the middle part of the valve stem 8 and the mounting hole 25 or mounting post 26 for the return spring 14 on the lower part of the valve stem 8, together with the guide hole 6 and the valve stem guide hole 13, are used to guide the movement of the valve stem 8. When the piston 5 moves down, the pressure relief straight hole 23 and the horizontal hole 24 quickly discharge the back pressure gas, avoiding gas stagnation that affects the movement speed of the valve stem 8; at the same time, the cooperation of the return spring 14 and the guide hole 6 ensures the accuracy and timeliness of the valve stem 8's return. This design improves the dynamic response capability of the solenoid valve, achieving the effect of improving working efficiency and operational reliability.

[0030] The valve cover 1 is equipped with two sets of two-position three-way pilot solenoid valves 18 corresponding to the two sets of valve chambers 21; the upper end of the valve stem 8 forms a clearance sliding pair with the guide hole of the valve sleeve 7, the middle part of the valve stem 8 is provided with a valve 11, and the lower end of the valve stem 8 forms a clearance sliding pair with the valve stem guide hole 13 of the valve chamber 21; the lower end of the valve sleeve 7 is provided with an exhaust valve port 9, and the bottom of the valve chamber 21 is provided with an air inlet valve port 12; the valve stem 8 is provided with a mounting hole 25 or a mounting post 26 for the installation of a return spring 14, and the lower end of the valve stem 8 is connected to the air inlet 15. Specifically, the valve cover 1 is equipped with two sets of two-position three-way pilot solenoid valves 18 corresponding to the two sets of valve chambers 21. The system comprises two sets of two-position three-way pilot solenoid valves 18, a clearance sliding pair formed by the upper end of the valve stem 8 and the guide hole of the valve sleeve 7, a valve 11 located in the middle of the valve stem 8, and a clearance sliding pair formed by the lower end of the valve stem 8 and the valve stem guide hole 13 of the valve cavity 21. These, along with the mounting holes 25 or mounting posts 26 on the valve stem 8 for mounting the return spring 14, allow the valve stem 8 to precisely switch positions under the control of the two-position three-way pilot solenoid valves 18, ensuring stable switching of the gas flow path. Simultaneously, the clearance sliding pair design reduces friction, noise, and energy consumption. This design not only optimizes the operating performance of the solenoid valves but also reduces operating noise, improves equipment quietness, and enhances energy efficiency.

[0031] In the working process of the normally open solenoid valve for the oxygen concentrator, compressed gas is first introduced into the two identical valve chambers 21 of the valve body 22 through the inlet 15, and then enters the system through the inlet valve 12. When the two-position three-way pilot solenoid valve 18 is energized, control gas enters the cylinder 3 through the control gas inlet / outlet 2 of the three-way pilot solenoid valve, pushing the piston 5 downward, which in turn moves the valve stem 8 and valve 11 fixed thereto downward. At this time, the valve 11 closes the inlet valve 12 and opens the exhaust valve 9, so that the working port 10 or the working port 17 is connected to the exhaust port 16, thereby realizing the process of gas discharge from the adsorption tower. When the two-position three-way pilot solenoid valve 18 is de-energized, the control gas in the cylinder 3 is discharged through the control gas inlet / outlet 2 of the three-way pilot solenoid valve. The force of the return spring 14 causes the valve stem 8, piston 5 and valve 11 to move upward, opening the inlet valve 12 and closing the exhaust valve 9, completing the switching of gas flow direction. During this process, the exhaust valve port 9 at the lower end of the valve sleeve 7 and the intake valve port 12 at the bottom of the valve chamber 21 cooperate with the sliding action of the valve stem 8 to ensure precise control of the gas flow path; while the guide hole 6 and the valve stem guide hole 13 ensure the smooth operation of the valve stem 8. In addition, the valve cover 1 is fixed by the valve cover connecting screw 19, and the two-position three-way pilot solenoid valve 18 is fixed by the two-position three-way pilot solenoid valve connecting screw 20 to ensure the stability and reliability of the overall structure. Furthermore, the valve cover 1 is equipped with two sets of two-position three-way pilot solenoid valves 18 corresponding to the two sets of valve chambers 21, as well as a valve 11 in the middle of the valve stem 8, a return spring 14 mounting hole 25 or mounting post 26 in the lower part of the valve stem 8, and a pressure relief straight hole 23 and a horizontal hole 24 in the upper part of the valve stem 8. This design ensures that when the two-position three-way pilot solenoid valve 18 is energized, the control gas pushes the piston 5 to move the valve stem 8 and the valve 11, completing the gas flow direction switching. Simultaneously, the pressure relief straight hole 23 and the horizontal hole 24 can quickly discharge back pressure gas, making the movement of the valve stem 8 more rapid and stable. This design optimizes the switching efficiency of the gas flow path, achieving the effect of improving the solenoid valve's response speed and operational stability. Furthermore, the design incorporates a sliding pair between the upper end of the valve stem 8 and the guide hole of the valve sleeve 7, a valve 11 located in the middle of the valve stem 8, and a sliding pair between the lower end of the valve stem 8 and the valve stem guide hole 13 of the valve cavity 21. Additionally, the design includes a mounting hole 25 or mounting post 26 on the valve stem 8 for mounting the return spring 14. During the operation of the solenoid valve, the valve stem 8 can achieve high-precision sliding under the guidance of the guide hole 6 and the valve stem guide hole 13, ensuring precise control of the inlet valve port 12 and the exhaust valve port 9 by the valve 11. This design improves the movement accuracy and stability of the valve stem 8, thereby reducing mechanical wear and extending the service life of the equipment.Furthermore, the gasket of valve 11 is made of fluororubber or modified PTFE, polyurethane, or polypropylene. Valve cover 1 is fixed by valve cover connecting screw 19, and the two-position three-way pilot solenoid valve 18 is fixed by two-position three-way pilot solenoid valve connecting screw 20. This, along with the guide hole 6 and valve stem guide hole 13, guides the movement of valve stem 8. The choice of gasket material for valve 11 enhances sealing performance and corrosion resistance, while the screw fixing method simplifies assembly and maintenance procedures. The guide hole 6 and valve stem guide hole 13 ensure the smooth operation of valve stem 8. This design significantly improves the sealing performance and reliability of the solenoid valve, achieving the effects of reducing maintenance costs and improving overall performance. Furthermore, the pressure relief straight hole 23 and horizontal hole 24 on the upper part of the valve stem 8 are interconnected, and the valve 11 in the middle of the valve stem 8 and the return spring 14 mounting hole 25 or mounting post 26 at the lower part of the valve stem 8, together with the guide hole 6 and the valve stem guide hole 13, are designed to guide the movement of the valve stem 8. When the piston 5 moves downward, the pressure relief straight hole 23 and horizontal hole 24 quickly discharge the back pressure gas, preventing gas stagnation from affecting the movement speed of the valve stem 8. At the same time, the cooperation between the return spring 14 and the guide hole 6 ensures the accuracy and timeliness of the valve stem 8's return. This design improves the dynamic response capability of the solenoid valve, achieving the effect of improving working efficiency and operational reliability. Finally, the valve cover 1 is equipped with two sets of two-position three-way pilot solenoid valves 18 corresponding to the two sets of valve chambers 21, and a clearance sliding pair is formed between the upper end of the valve stem 8 and the guide hole of the valve sleeve 7, a valve 11 is set in the middle of the valve stem 8, and a clearance sliding pair is formed between the lower end of the valve stem 8 and the valve stem guide hole 13 of the valve chamber 21. Combined with the mounting hole 25 or mounting post 26 on the valve stem 8 for mounting the return spring 14, under the control of the two-position three-way pilot solenoid valves 18, the valve stem 8 can accurately complete the position switching, ensuring stable switching of the gas flow path. At the same time, the clearance sliding pair design reduces friction, lowering noise and energy consumption. This design not only optimizes the operating performance of the solenoid valves but also achieves the effects of reducing operating noise, improving equipment quietness, and increasing energy efficiency.

[0032] This design brings several beneficial effects: First, by eliminating the traditional diaphragm and rubber ring structure and using a clearance fit between the valve stem 8, valve sleeve 7, and valve body 22, the impact of gas flow on the diaphragm is effectively reduced, thus significantly reducing operating noise and improving the user experience. Second, the normally open solenoid valve design allows the valve 11 to automatically close the exhaust valve port 9 when the oxygen generator stops running, preventing external humid air from entering the system through the exhaust port 16, avoiding moisture damage to the molecular sieve, extending the service life of the equipment and its key components, and improving the reliability and stability of the oxygen generator. Furthermore, the valve 11 located in the middle of the valve stem 8 can quickly close the exhaust valve port 9 after pressure loss due to the elasticity of the return spring 14, ensuring the system's immediate response capability and further enhancing equipment safety. In addition, the gasket of the valve 11 uses high-performance materials such as fluororubber and modified PTFE, which not only enhances sealing performance but also improves corrosion resistance and durability, reducing the risk of failure due to material aging. Then, the pressure relief straight hole 23 and horizontal hole 24 on the upper part of the valve stem 8 are interconnected, which can quickly discharge back pressure gas and prevent gas stagnation from affecting the movement speed of the valve stem 8. At the same time, the cooperation of the return spring 14 and the guide hole 6 ensures the accuracy and timeliness of the valve stem 8's return, significantly improving the dynamic response capability and operational reliability of the solenoid valve. Finally, the valve cover 1 and the two-position three-way pilot solenoid valve 18 are fixed by the valve cover connecting screw 19 and the two-position three-way pilot solenoid valve connecting screw 20, respectively, simplifying the installation and maintenance process, reducing the cost of use, and providing users with a more convenient and efficient solution. These designs work together to significantly solve the problems of high operating noise and system susceptibility to moisture in the existing technology, meet users' expectations for low noise and high stability, and provide strong support for the sustainable development of the oxygen concentrator industry.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A normally open solenoid valve for an oxygen concentrator, characterized in that, include: The valve body (22) has two identical valve chambers (21) formed inside, sharing an air inlet (15) and an exhaust outlet (16); the valve body (22) is also provided with an air inlet valve (12), an exhaust valve (9), a working port one (10), and a working port two (17); the valve chamber (21) is provided with a cylinder (3), a piston (5), a Yx sealing ring (4), a valve stem (8), and a valve (11) fixedly connected to it, for sliding with the upper end of the valve stem (8). The valve sleeve (7) is provided with an exhaust valve port (9) at the lower end of the valve sleeve (7), and an air inlet valve port (12) and a return spring (14) are provided at the bottom of the valve cavity (21); the valve body (22) is provided with a valve cover (1), and a two-position three-way pilot solenoid valve is provided inside the valve cover (1) to control the air inlet and outlet (2); the valve cover (1) is fixed by a valve cover connecting screw (19), and the two-position three-way pilot solenoid valve (18) is fixed by a two-position three-way pilot solenoid valve connecting screw (20).

2. The normally open electromagnetic valve for an oxygen generator according to claim 1, wherein The valve cover (1) is equipped with two sets of two-position three-way pilot solenoid valves (18) corresponding to the two sets of valve chambers (21); a valve (11) is provided in the middle of the valve stem (8); a mounting hole (25) or mounting post (26) for a return spring (14) is provided in the lower part of the valve stem (8); a pressure relief straight hole (23) and a horizontal hole (24) are also provided in the upper part of the valve stem (8), and they are interconnected: the guide hole (6) and the valve stem guide hole (13) are used to guide the movement of the valve stem (8).

3. The normally open electromagnetic valve for an oxygen generator according to claim 1, wherein The upper end of the valve stem (8) forms a clearance sliding pair with the guide hole of the valve sleeve (7), and the valve stem (8) is provided with a valve (11) in the middle. The lower end of the valve stem (8) forms a clearance sliding pair with the valve stem guide hole (13) of the valve cavity (21). The lower end of the valve sleeve (7) is provided with an exhaust valve port (9), and the bottom of the valve cavity (21) is provided with an air inlet valve port (12). The valve stem (8) is provided with a mounting hole (25) or a mounting post (26) for the installation of the reset spring (14). The lower end of the valve stem (8) is connected to the air inlet (15).

4. The normally open electromagnetic valve for an oxygen generator according to claim 1, wherein The gasket material of the valve (11) is fluororubber or modified PTFE, or polyurethane or polypropylene; the valve cover (1) is fixed by the valve cover connecting screw (19), and the two-position three-way pilot solenoid valve (18) is fixed by the two-position three-way pilot solenoid valve connecting screw (20); the guide hole (6) and the valve stem guide hole (13) are used to guide the movement of the valve stem (8).

5. The normally open electromagnetic valve for an oxygen generator according to claim 1, wherein The upper part of the valve stem (8) is provided with a pressure relief straight hole (23) and a horizontal hole (24), which are connected to each other; the middle part of the valve stem (8) is provided with a valve (11), and the lower part of the valve stem (8) is provided with a mounting hole (25) or a mounting post (26) for a return spring (14); the guide hole (6) and the valve stem guide hole (13) are used to guide the movement of the valve stem (8).

6. The normally open electromagnetic valve for an oxygen generator according to claim 1, wherein The valve cover (1) is equipped with two sets of two-position three-way pilot solenoid valves (18) corresponding to the two sets of valve chambers (21); the upper end of the valve stem (8) forms a clearance sliding pair with the guide hole of the valve sleeve (7), the middle part of the valve stem (8) is provided with a valve (11), and the lower end of the valve stem (8) forms a clearance sliding pair with the valve stem guide hole (13) of the valve chamber (21); the lower end of the valve sleeve (7) is provided with an exhaust valve port (9), and the bottom of the valve chamber (21) is provided with an air inlet valve port (12); the valve stem (8) is provided with a mounting hole (25) or a mounting post (26) for the installation of the return spring (14), and the lower end of the valve stem (8) is connected to the air inlet (15).

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