Hydrogen flow proportional valve for fuel cell system

Abstract

The utility model discloses a hydrogen flow proportional valve for a fuel cell system, which relates to the technical field of valves, and comprises a valve body, a first composite bearing and a second composite bearing, a framework is mounted in the valve body, an enameled wire is wound on the framework, a left pin and a right pin are further mounted on the framework, and the left pin and the right pin are connected with the valve body. The left inserting needle and the right inserting needle are assembled into a coil assembly, a valve element is installed on the lower middle portion of the interior of the valve body, vulcanized rubber is installed on the lower side of the valve element, and a magnetic core is installed on the upper side of the valve element. According to the hydrogen flow proportional valve for the fuel cell system, due to the application of the first composite bearing and the second composite bearing at the front yoke, standard parts are adopted, the machining difficulty can be reduced, it is guaranteed that a magnetic core does not have clamping stagnation in the working process, the performance stability of the proportional valve is improved, the size of the proportional valve is small, and the composite bearings are designed to guide and reduce friction; and the magnetic shield structure can optimize the guide of the spring and prolong the service life of the spring, so that the repeatability of the proportional valve is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hydrogen flow proportional valve for a fuel cell system. Background Art

[0002] The proportional valve is one of the core hydrogen-related components in the fuel cell system. Its function is to provide hydrogen with a certain pressure and flow rate to the fuel cell stack. Its performance and stability are related to the normal operation of the entire vehicle and the safety of life and property of passengers.

[0003] Existing proportional valve products have complex structures. The fuel cell system has a large amount of hydrogen under high load, which requires high air tightness of the proportional valve. At the same time, when the proportional valve controls the hydrogen flow, it also requires high repeatability. This makes the product processing cost high, and the air tightness and repeatability cannot be guaranteed.

[0004] Therefore, in view of this, the existing structure and defects are studied and improved, and a hydrogen flow proportional valve for a fuel cell system is proposed. Utility Model Content

[0005] The purpose of the present utility model is to provide a hydrogen flow proportional valve for a fuel cell system to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a hydrogen flow proportional valve for a fuel cell system, comprising a first composite bearing and a second composite bearing of a valve body, a frame installed inside the valve body, and an enameled wire wrapped around the frame, a left pin and a right pin also installed on the frame, and the left pin and the right pin are assembled into a coil assembly, a valve core is installed in the middle and lower part of the interior of the valve body, and vulcanized rubber is installed on the lower side of the valve core, a magnetic core is installed on the upper side of the valve core, and a magnetic isolation sleeve is installed on the upper side of the magnetic core, a front yoke is installed on the outer side of the magnetic core, and the first composite bearing and the second composite bearing are respectively provided on the lower and upper sides of the front yoke, and a first O-ring and a second O-ring are respectively provided between the upper and lower sides of the front yoke and the valve body.

[0007] Furthermore, an outer cover is installed on the outer side of the coil assembly, and an outer cover gasket is provided on the upper side of the outer cover.

[0008] Furthermore, the coil assembly, outer cover and outer cover gasket are overmolded into a solenoid.

[0009] Furthermore, a back yoke is installed above the solenoid, a sixth O-ring is provided between the back yoke and the frame, and a spring is provided between the back yoke and the magnetic core.

[0010] Furthermore, a limit block is installed at the bottom valve port of the valve body, a fourth O-ring is provided between the limit block and the inner cavity of the valve body, and a fifth O-ring is installed on the outer side of the bottom of the valve body.

[0011] Furthermore, the upper outer side of the valve body is provided with plastic coating.

[0012] The utility model provides a hydrogen flow proportional valve for a fuel cell system, which has the following features:

[0013] Beneficial effects:

[0014] The utility model is provided with a first composite bearing and a second composite bearing. The application of the first composite bearing and the second composite bearing at the front yoke iron adopts standard parts, which can reduce the difficulty of processing, ensure that the magnetic core is not stuck during operation, and improve the stability of the performance of the proportional valve. In addition, a first O-ring, a second O-ring, a third O-ring, a fourth O-ring, a fifth O-ring, and a sixth O-ring are provided. The application of multiple O-rings improves the reliability of the seal compared with the rigid seal, and the proportional valve is miniaturized and the versatility is improved. The composite bearing guide and friction reduction design increase the working life of the proportional valve. The magnetic isolation sleeve structure can optimize the spring guide and increase the service life of the spring, thereby ensuring the repeatability of the proportional valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal half-section structure of a hydrogen flow proportional valve for a fuel cell system according to the present invention;

[0016] Figure 2 This is a schematic diagram of the external front view structure of a hydrogen flow proportional valve for a fuel cell system according to the present invention;

[0017] Figure 3 The figure is a schematic diagram of the external top view of a hydrogen flow proportional valve for a fuel cell system according to the present invention.

[0018] In the figure: 1. Solenoid; 2. First O-ring; 3. Second O-ring; 4. Third O-ring; 5. Vulcanized rubber; 6. Fourth O-ring; 7. Fifth O-ring; 8. Stopper; 9. Valve body; 10. Valve core; 11. Front yoke; 12. First composite bearing; 13. Magnetic core; 14. Second composite bearing; 15. Magnetic isolation sleeve; 16. Spring; 17. Coil assembly; 18. Skeleton; 19. Left pin; 20. Right pin; 21. Back yoke; 22. Outer cover; 23. Outer cover gasket; 24. Enameled wire; 25. Sixth O-ring; 26. Plastic overmold. DETAILED DESCRIPTION

[0019] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0020] like Figure 1-Figure 3 As shown, a hydrogen flow proportional valve for a fuel cell system includes a valve body 9, a first composite bearing 12, and a second composite bearing 14. A skeleton 18 is installed inside the valve body 9, and an enameled wire 24 is wound on the skeleton 18. A left pin 19 and a right pin 20 are also installed on the skeleton 18, and the left pin 19 and the right pin 20 are assembled into a coil assembly 17. A valve core 10 is installed in the middle and lower part of the valve body 9, and a vulcanized rubber 5 is installed on the lower side of the valve core 10. A magnetic core 13 is installed on the upper side of the valve core 10, and a magnetic isolation sleeve 15 is installed on the upper side of the magnetic core 13. A front yoke 11 is installed on the outside, and a first composite bearing 12 and a second composite bearing 14 are respectively provided on the lower side and the upper side of the front yoke 11, and a first O-ring 2 and a second O-ring 3 are respectively provided between the upper and lower sides of the front yoke 11 and the valve body 9; the application of the first composite bearing 12 and the second composite bearing 14 at the front yoke 11 adopts standard parts, which can reduce the difficulty of processing, ensure that the magnetic core 13 is not stuck during operation, and improve the stability of the performance of the proportional valve. The application of multiple O-rings improves the reliability of the seal compared with rigid seals.

[0021] like Figure 1 As shown, an outer cover 22 is installed on the outside of the coil assembly 17, and an outer cover gasket 23 is provided on the upper side of the outer cover 22; the coil assembly 17, the outer cover 22 and the outer cover gasket 23 are overmolded into a solenoid 1, a back yoke 21 is installed above the solenoid 1, and a sixth O-ring 25 is provided between the back yoke 21 and the skeleton 18, and a spring 16 is provided between the back yoke 21 and the magnetic core 13; a limit block 8 is installed at the bottom valve port of the valve body 9, and a fourth O-ring 6 is provided between the limit block 8 and the inner cavity of the valve body 9, and a fifth O-ring 7 is installed on the bottom outer side of the valve body 9; a plastic overmold 26 is provided on the upper outer side of the valve body 9; the proportional valve When no power is supplied, the vulcanized rubber 5 fits against the limit block 8, and the spring force generated by the spring 16 overcomes the vibration resistance of the magnetic core 13 and the gas pressure of the hydrogen acting on the valve port of the limit block 8 to achieve sealing. When the proportional valve is energized, the outer cover 22, the outer cover gasket 23, the rear yoke 21, the front yoke 11, the enameled wire 24 and the magnetic core 13 form a magnetic circuit, and the magnetic core 13 will be subjected to axial electromagnetic force. With a reasonably designed stroke of the magnetic core 13, the electromagnetic force applied to the magnetic core 13 will overcome the spring force of the spring 16 and the vibration resistance applied to the magnetic core 13, and the magnetic core 13 will be attracted upward at a certain proportion, thereby opening the valve port at the limit block 8 and allowing the hydrogen to flow to the side hole on the valve body 9.

[0022] In summary, if Figure 1-Figure 3As shown, the hydrogen flow proportional valve for fuel cell system is installed with the left pin 19 and the right pin 20 on the frame 18, which are wound with enameled wire 24 and installed in the outer cover 22. After the outer cover gasket 23 is installed, they are injection molded together to form a solenoid 1. Then the rear yoke 21 is installed in the solenoid 1, so that the rear yoke 21 and the frame 18 are sealed by the sixth O-ring 25. Then, the magnetic core 13 is installed with the magnetic isolation sleeve 15 and the valve core 10 with vulcanized rubber 5, and the front yoke 11 is installed with the first A composite bearing 12 and a second composite bearing 14, then the limit block 8 is installed into the valve body 9, sealed by the fourth O-ring 6, and then the spring 16, the magnetic core 13, the front yoke 11 and the valve body 9 are installed in sequence. The outer cover 22 on the solenoid 1 and the valve body 9 are integrally formed by riveting. During use, when the proportional valve is not powered, the vulcanized rubber 5 fits with the limit block 8, and the spring force generated by the spring 16 overcomes the vibration resistance of the magnetic core 13 and the action of hydrogen on the limit block 8. The air pressure at the valve port realizes sealing. When the proportional valve is energized, the outer cover 22, the outer cover gasket 23, the rear yoke 21, the front yoke 11, the enameled wire 24 and the magnetic core 13 form a magnetic circuit. The magnetic core 13 will be subjected to axial electromagnetic force. With a reasonably designed stroke of the magnetic core 13, the electromagnetic force exerted on the magnetic core 13 will overcome the spring force exerted on the spring 16 and the vibration resistance exerted on the magnetic core 13, and the magnetic core 13 will be attracted upward in a certain proportion, thereby opening the valve port at the limit block 8, allowing the hydrogen flow to the side hole on the valve body 9, and the application of the first composite bearing 12 and the second composite bearing 14 at the front yoke 11 during use uses standard parts, which can reduce the difficulty of processing, ensure that the magnetic core 13 is not stuck during operation, and improve the stability of the proportional valve performance. At the same time, the application of multiple O-rings improves the reliability of the seal compared with the rigid seal, thus completing the use process of the hydrogen flow proportional valve for the fuel cell system.

[0023] The embodiments of the present invention are provided for purposes of illustration and description and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention and to enable those skilled in the art to understand the present invention and design various embodiments with various modifications suitable for specific applications.

Claims

1. A hydrogen flow proportional valve for a fuel cell system, comprising a valve body (9), a first composite bearing (12), and a second composite bearing (14), characterized in that: A frame (18) is installed inside the valve body (9), and an enameled wire (24) is wound on the frame (18). A left plug pin (19) and a right plug pin (20) are also installed on the frame (18), and the left plug pin (19) and the right plug pin (20) are assembled into a coil assembly (17). A valve core (10) is installed in the middle and lower part of the valve body (9), and a vulcanized rubber (5) is installed on the lower side of the valve core (10). The valve core (10) A magnetic core (13) is installed on the upper side of the magnetic core (13), and a magnetic isolation sleeve (15) is installed on the upper side of the magnetic core (13); a front yoke (11) is installed on the outer side of the magnetic core (13), and a first composite bearing (12) and a second composite bearing (14) are respectively provided on the lower side and the upper side of the front yoke (11), and a first O-type sealing ring (2) and a second O-type sealing ring (3) are respectively provided between the upper and lower sides of the front yoke (11) and the valve body (9).

2. A hydrogen flow proportional valve for a fuel cell system according to claim 1, characterized in that: An outer cover (22) is installed on the outer side of the coil assembly (17), and an outer cover gasket (23) is provided on the upper side of the outer cover (22).

3. A hydrogen flow proportional valve for a fuel cell system according to claim 2, characterized in that: The coil assembly (17), the outer cover (22) and the outer cover gasket (23) are overmolded to form a solenoid (1).

4. A hydrogen flow proportional valve for a fuel cell system according to claim 3, characterized in that: A back yoke (21) is installed above the solenoid (1), a sixth O-type sealing ring (25) is provided between the back yoke (21) and the frame (18), and a spring (16) is provided between the back yoke (21) and the magnetic core (13).

5. The hydrogen flow proportional valve for a fuel cell system according to claim 1, characterized in that: A limit block (8) is installed at the bottom valve port of the valve body (9), a fourth O-type sealing ring (6) is provided between the limit block (8) and the inner cavity of the valve body (9), and a fifth O-type sealing ring (7) is installed on the outer side of the bottom of the valve body (9).

6. The hydrogen flow proportional valve for a fuel cell system according to claim 1, characterized in that: A plastic coating (26) is provided on the upper outer side of the valve body (9).

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