A pressure relief valve

Abstract

The utility model relates to a kind of pressure relief valve, including shell, valve stem, inner support plate, outer support plate and adjusting nut, the cavity is equipped in the shell, the valve stem is movably installed in the cavity, one end of the valve stem is equipped with the inner support plate, the other end is equipped with the outer support plate and the adjusting nut, the compression spring is sleeved on the valve stem, one end of the compression spring is in abutment with the inner support plate, the other end is in abutment with the outer support plate.In use process, when system pressure exceeds set value, valve stem can automatically move, by adjusting the position of adjusting nut on valve stem, the pre-tightening force of compression spring is adjusted, to adjust the opening pressure of pressure relief valve, reach the purpose of pressure relief, since the variable range of compression spring is big, therefore, realize the pressure relief pressure range of increasing pressure relief valve, enhance the adaptive capacity of pressure relief valve under different working conditions, improve the scope of application.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief technology, specifically to a pressure relief valve. Background Technology

[0002] Currently, there are three main methods for depressurizing hydrogen fuel cell stack ejectors: self-regulating, pilot-operated, and electromagnetically driven. The self-regulating method relies on the balance between the system's medium pressure and the spring force inside the pressure relief valve to achieve automatic depressurization. When the system pressure exceeds a set value, the medium pressure overcomes the spring resistance, pushing the valve disc open to release excess gas; after the pressure drops, the spring returns to its original position and closes the valve disc. Therefore, the self-regulating pressure relief valve features a simple structure and zero power consumption.

[0003] However, existing pressure relief valves have drawbacks such as a small adjustable pressure range and a large overall size. For some compact hydrogen fuel cell stacks, structural interference and inability to match the pressure relief pressure often occur. Utility Model Content

[0004] This utility model addresses the existing technical problems by providing a pressure relief valve.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: A pressure relief valve includes a housing, a valve stem, an inner support plate, an outer support plate, and an adjusting nut. The housing has a cavity, and the valve stem is movably installed in the cavity. One end of the valve stem is provided with the inner support plate, and the other end is provided with the outer support plate and the adjusting nut. A compression spring is sleeved on the valve stem, and one end of the compression spring abuts against the inner support plate, and the other end abuts against the outer support plate.

[0006] Based on the above technical solution, the present invention can be further improved as follows:

[0007] Preferably, the upper end of the housing is provided with a sealing surface one, the valve stem is provided with a corresponding sealing surface two, and an inner sealing ring is installed between the sealing surface one and the sealing surface two.

[0008] Preferably, the inner sealing ring is a star-shaped sealing ring.

[0009] Preferably, one end of the inner support plate is provided with multiple claws, and the other end is provided with a guide boss. The inner support plate is installed in the cavity through the claws, and the end of the compression spring is installed on the guide boss.

[0010] Preferably, the outer support plate is provided with a second guide boss, and the other end of the compression spring is mounted on the second guide boss.

[0011] Preferably, the outer support plate has multiple protrusions circumferentially, and the protrusions are adapted to the inner wall of the cavity.

[0012] Preferably, an outer sealing ring is installed on the outer side of the housing.

[0013] The beneficial effects of this utility model are as follows: By setting an inner support plate, an outer support plate, an adjusting nut, and a compression spring sleeved on the valve stem, the stability and reliability of the pressure relief valve are achieved. During use, when the system pressure exceeds the set value, the valve stem can move automatically. By adjusting the position of the adjusting nut on the valve stem, the preload of the compression spring is adjusted, thereby adjusting the opening pressure of the pressure relief valve to achieve the purpose of pressure relief. Due to the large range of the compression spring, the pressure relief pressure range of the pressure relief valve (190Kpa-270Kpa) is increased, enhancing the adaptability of the pressure relief valve under different working conditions and improving its applicability. The overall structure of this pressure relief valve is compact and small in size, meeting the needs of applications with limited space. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the pressure relief valve of this utility model;

[0015] Figure 2 This is a perspective view of the inner support plate of this utility model;

[0016] Figure 3 This is a cross-sectional view of the inner support plate of this utility model;

[0017] Figure 4 This is a perspective view of the outer support plate of this utility model;

[0018] Figure 5 This is a cross-sectional view of the outer support plate of this utility model.

[0019] The attached diagram is labeled as follows: 1. Housing; 2. Valve stem; 3. Inner support plate; 31. Claw; 32. Guide boss one; 4. Compression spring; 5. Outer support plate; 51. Protrusion; 52. Guide boss two; 6. Adjusting nut; 7. Inner sealing ring; 8. Outer sealing ring; 9. Slotted groove. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. The terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0022] like Figures 1 to 5 As shown, this utility model discloses a pressure relief valve, including a housing 1, a valve stem 2, an inner support plate 3, an outer support plate 5, and an adjusting nut 6. The housing 1 has a cavity, and the valve stem 2 is movably installed within the cavity. One end of the valve stem 2 is provided with the inner support plate 3, and the other end is equipped with the outer support plate 5 and the adjusting nut 6. A compression spring 4 is sleeved on the valve stem 2, with one end abutting against the inner support plate 3 and the other end abutting against the outer support plate 5. The upper end of the valve stem 2 has a slot 9, and the lower end of the valve stem 2 has an external thread. The adjusting nut 6 is installed on the valve stem 2 through the external thread. When it is necessary to adjust the position of the adjusting nut 6 on the valve stem 2, a flathead screwdriver is inserted into the slot 9 to fix the valve stem 2, and then the position of the adjusting nut 6 is adjusted. The structure is simple and the adjustment is convenient.

[0023] In this embodiment, the upper end of the housing 1 is provided with a sealing surface one, and the valve stem 2 is provided with a corresponding sealing surface two. An inner sealing ring 7 is installed between the sealing surface one and the sealing surface two. This effectively prevents media leakage and ensures the safety of the system. The inner sealing ring 7 is a star-shaped sealing ring, which has good sealing performance and anti-compression performance, further ensuring the sealing effect. The sealing surface one and the sealing surface two are inclined surfaces, ensuring the sealing effect and facilitating the application of force by gas to the sealing surface two of the valve stem 2, causing the valve stem 2 to rise quickly and improving the response speed of the pressure relief valve.

[0024] Furthermore, one end of the inner support plate 3 is provided with multiple claws 31, and the other end is provided with a guide boss 32. The inner support plate 3 is installed in the cavity via the claws 31, and the end of the compression spring 4 is installed on the guide boss 32. In this embodiment, three claws 31 are evenly arranged circumferentially. The inner support plate 3 is securely installed in the cavity via the claws 31, ensuring the stability of the inner support plate 3 in the cavity and preventing it from shifting or shaking. At the same time, the guide boss 32 allows the end of the compression spring 4 to be accurately and reliably installed on the inner support plate 3, ensuring the stability and reliability of the compression spring 4 during operation, and further enhancing the overall stability and service life of the pressure relief valve.

[0025] The outer support plate 5 is provided with a second guide boss 52. The other end of the compression spring 4 is mounted on the second guide boss 52. The second guide boss 52 supports and guides the compression spring 4, ensuring that the end of the compression spring 4 can be stably mounted on the outer support plate 5. This prevents the compression spring 4 from shaking or shifting during operation, thus ensuring the stability and reliability of the pressure relief valve. At the same time, the second guide boss 52 cooperates with the first guide boss 32, making the installation of the compression spring 4 on the valve stem 2 more accurate and reliable, further enhancing the overall performance and service life of the pressure relief valve.

[0026] Furthermore, the outer support plate 5 is provided with multiple protrusions 51 circumferentially, and the protrusions 51 are adapted to the inner wall of the cavity. In this embodiment, three protrusions 51 are evenly provided circumferentially. By cooperating with the inner wall of the cavity, the protrusions 51 play a guiding role for the outer support plate 5, preventing the outer support plate 5 from shifting during operation, ensuring that the pressure relief valve can work normally, reducing the overall weight of the outer support plate 5, and realizing the rapid opening of the pressure relief valve.

[0027] In this embodiment, an outer sealing ring 8 is installed on the outer side of the housing 1. In use, the pressure relief valve is installed at the outlet of the existing hydrogen ejector. When the outlet pressure of the ejector is greater than the set value of the pressure relief valve, the hydrogen will overcome the preload of the compression spring 4 and push the valve stem 2 upward, thereby causing the hydrogen to overflow. The outer sealing ring 8 can ensure the sealing between the pressure relief valve and the outlet of the flow channel, effectively preventing hydrogen leakage.

[0028] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A pressure relief valve characterized by, The device includes a housing (1), a valve stem (2), an inner support plate (3), a compression spring (4), an outer support plate (5), and an adjusting nut (6). The housing (1) has a cavity inside, and the valve stem (2) is movably installed in the cavity. One end of the valve stem (2) is provided with the inner support plate (3), and the other end is provided with the outer support plate (5) and the adjusting nut (6). The compression spring (4) is sleeved on the valve stem (2), with one end of the compression spring (4) abutting against the inner support plate (3) and the other end abutting against the outer support plate (5).

2. The pressure relief valve of claim 1, wherein The upper end of the housing (1) is provided with a sealing surface one, and the valve stem (2) is provided with a corresponding sealing surface two. An inner sealing ring (7) is installed between the sealing surface one and the sealing surface two.

3. The pressure relief valve of claim 2, wherein The inner sealing ring (7) is a star-shaped sealing ring.

4. The pressure relief valve of claim 2, wherein The inner support plate (3) has multiple claws (31) at one end and a guide boss (32) at the other end. The inner support plate (3) is installed in the cavity through the claws (31), and the end of the compression spring (4) is installed on the guide boss (32).

5. The pressure relief valve of claim 3, wherein The outer support plate (5) is provided with a guide boss (52), and the other end of the compression spring (4) is installed on the guide boss (52).

6. The pressure relief valve of claim 5, wherein, The outer support plate (5) is provided with a plurality of protrusions (51) in the circumferential direction, and the protrusions (51) are adapted to the inner wall of the cavity.

7. The pressure relief valve of claim 1, wherein An outer sealing ring (8) is installed on the outside of the housing (1).

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