Pressure limiting valve

Abstract

The pressure limiting valve comprises a valve seat component, a valve element component and an elastic component, and the valve element component comprises a valve element and a sealing block connected with the valve element; the valve seat component is provided with a cavity, and the valve element component and the elastic component are located in the cavity. The valve seat part comprises a valve seat and a cover cap connected with the valve seat, one side part of the elastic part abuts against the valve element, and the other side part of the elastic part abuts against the cover cap; the valve seat is provided with a valve port part, and the sealing block can abut against or be away from the valve port part. The valve seat is provided with a first matching face, and the valve element is provided with a second matching face. And in the valve closing state, the second matching surface abuts against the first matching surface in the axial direction, and the sealing block abuts against the valve port part. The pressure limiting valve can limit the installation of the valve core component in the valve seat component, so that the compression deformation of the sealing block can be controlled, the service life of the sealing block is prolonged, and the sealing performance of the sealing block is relatively guaranteed.

Description

Technical Field

[0001] This application relates to the field of valve device technology, and in particular to a pressure relief valve. Background Technology

[0002] Pressure relief valves are typically used in systems such as containers, pipelines, or equipment to control the internal pressure of the system so that it does not exceed a set value.

[0003] A pressure relief valve may include a valve body, a connector, a sealing plug, and a spring. The valve body and connector may be threaded together. The valve body has a cavity, in which the sealing plug and spring are housed. The valve body has an inlet channel and a bypass channel, and a valve port. The two ends of the spring abut against the sealing plug and the connector, respectively. The sealing plug can be abutted against or away from the valve port. During use, when the internal pressure of the system connected to the pressure relief valve exceeds a set value, the sealing plug moves away from the valve port under the pressure difference between the inside and outside of the system. The spring is compressed, and excess fluid from inside the system enters the cavity through the inlet channel and is discharged through the bypass channel, reducing the internal pressure of the system. When the internal pressure of the system returns to below the set value, the spring returns to its original position, pushing the sealing plug closer to and against the valve port. Under the action of the spring force, the sealing plug is compressed and deformed at the valve port, achieving a seal.

[0004] In this type of pressure relief valve, the spring and the sealing plug are in direct contact, so the spring force acts directly on the sealing plug, and the degree of compression deformation of the sealing plug is directly affected by the spring force. Specifically, when the valve is closed, if the spring force is too large, it can easily cause the sealing plug to deform excessively, or even be squeezed into the valve port, shortening the service life of the sealing plug; if the spring force is too small, the amount of compression deformation of the sealing plug is small, which will lead to a decrease in the sealing performance of the pressure relief valve.

[0005] Therefore, how to provide a solution to overcome or alleviate the above-mentioned defects remains a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] The purpose of this application is to provide a pressure relief valve that can control the amount of compression deformation of the sealing block.

[0007] To solve the above-mentioned technical problems, this application provides a pressure relief valve, including a valve seat component, a valve core component, and an elastic component, wherein the valve core component includes a valve core and a sealing block connected to the valve core;

[0008] The valve seat component has a cavity, and the valve core component and the elastic component are located in the cavity; the valve seat component includes a valve seat and a cover connected to the valve seat, one side of the elastic component abuts against the valve core, and the other side abuts against the cover; the valve seat has a valve port, and the sealing block can abut against or move away from the valve port;

[0009] The valve seat has a first mating surface, and the valve core has a second mating surface; in the closed state, the second mating surface abuts against the first mating surface along the axial direction, and the sealing block abuts against the valve port.

[0010] The pressure-limiting valve provided in this application has a valve core component and an elastic component disposed within the cavity of the valve seat component. The valve core component includes a valve core and a sealing block connected to each other, and the valve seat component includes a valve seat and a cover connected to each other. One side of the elastic component abuts against the valve core, and the other side abuts against the cover. The valve seat has a valve port, and the sealing block can abut against or move away from the valve port. The valve seat has a first mating surface, and the valve core has a second mating surface. In the closed state, the second mating surface abuts against the first mating surface axially, and the sealing block abuts against the valve port. In this way, the installation of the valve core component within the valve seat component can be limited, so that the abutment stroke of the valve core against the sealing block is determined, thereby controlling the amount of compression deformation of the sealing block. The deformation of the sealing block is not affected by the elastic force of the elastic component. Even if the elastic force of the elastic component is too large, the sealing block is not prone to excessive deformation, extending the service life of the sealing block. Even if the elastic force of the elastic component is too small, the sealing block still has relatively good sealing performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the pressure relief valve in the closed state according to the embodiments provided in this application;

[0012] Figure 2 This is a schematic diagram of the pressure relief valve in the embodiment provided in this application at the moment of valve opening;

[0013] Figure 3 for Figure 1 A partial schematic diagram of the connection between the valve core component and the valve seat component;

[0014] Figure 4 for Figure 1 Schematic diagram of the middle valve core component;

[0015] Figure 5 for Figure 1 Schematic diagram of the middle valve core;

[0016] Figure 6 for Figure 1 Schematic diagram of the middle sealing block;

[0017] Figure 7 for Figure 1 Schematic diagram of the middle valve seat component;

[0018] Figure 8 for Figure 1 Schematic diagram of the middle valve seat;

[0019] Figure 9 for Figure 1 A schematic diagram of the structure of the middle cover.

[0020] The reference numerals in the above figures are explained as follows:

[0021] 1-Valve seat component, 1a-Cavity, 11-Valve seat, 11a-First stepped countersunk hole, 11b-Inlet channel, 11c-Outlet channel, 111-Valve port, 111a-Valve port, 112-First mating surface, 113-First sealing surface, 114-Rounded corner, 12-Cover, 12a-Inner cavity, 12b-Drain channel, 121-Top wall;

[0022] 2-Valve core, 2a-Second step countersunk hole, 2b-First annular step, 2c-Third annular step, 2d-Groove, 21-Second mating surface, 22-Third mating surface, 23-Fourth mating surface, 24-First step surface, 25-Chamfer, 26-Groove bottom surface, 27-Upper end surface; e-Flow clearance;

[0023] 3-Sealing block, 3a-Second annular step, 31-Fifth mating surface, 32-Sixth mating surface, 33-Second sealing surface, 34-Side surface; a1-Limiting part, a2-Sealing part, g-Deformation space;

[0024] 4-Elastic components. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present application, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] In the description of this application, it should be specifically noted that the terms "up" and "down" used in this application refer to directions that are... Figure 1 From a perspective of vertical direction, which is also the axial direction of the pressure relief valve, please refer to [reference needed]. Figures 1 to 9 As indicated by the arrows, the sealing block 3 moves downwards towards the valve port 111a and upwards away from the valve port 111a.

[0027] The terms "first" and "second" used in this application are merely for the convenience of describing two or more structures or components that are identical or similar in structure and / or function, and do not imply any special limitation on their order and / or importance.

[0028] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the pressure relief valve in the closed state according to the embodiments provided in this application.

[0029] In the embodiments provided in this application, the pressure relief valve includes a valve seat component 1, a valve core component, and an elastic component 4. The valve core component includes a valve core 2 and a sealing block 3 connected to the valve core 2. The valve seat component 1 has a cavity 1a, specifically including a valve seat 11 and a cover 12 connected to the valve seat 11, which are fastened together to define the cavity 1a. The valve core component and the elastic component 4 are located in the cavity 1a. The valve seat 11 has a valve port 111 located in the cavity 1a, and the valve port 111 has a valve port 111a. The sealing block 3 can abut against or move away from the valve port 111, correspondingly closing or opening the valve port 111a; one side of the elastic component 4 abuts against the valve core 2, and the other side abuts against the cover 12, and the elastic component 4 indirectly abuts against the sealing block 3.

[0030] It is worth noting that in this embodiment, the valve seat 11 has a first mating surface 112 and the valve core 2 has a second mating surface 21; in the closed state, the second mating surface 21 abuts against the first mating surface 112 along the axial direction and the sealing block 3 abuts against the valve port 111.

[0031] With this configuration, the elastic force of the elastic component 4 indirectly acts on the sealing block 3. Furthermore, the first mating surface 112 of the valve seat component 1 and the second mating surface 21 of the valve core component form a limiting mating structure. In the closed state, the second mating surface 21 can abut against the first mating surface 112 under the elastic force of the elastic component 4, restricting the valve core component from continuing to move towards the valve port 111. This limits the installation of the valve core component within the valve seat component 1. Based on this, the abutment stroke of the valve core 2 against the sealing block 3 is determined, thereby controlling the amount of compression deformation of the sealing block 3 at the valve port 111, keeping its compression deformation within a suitable range. Moreover, its compression deformation is not affected by the elastic force of the elastic component 4. Even if the elastic force of the elastic component 4 is too large, the sealing block 3 will not deform excessively, thus extending the service life of the sealing block 3. Even if the elastic force of the elastic component 4 is small, the sealing block 3 can still have good sealing performance. It is easy to understand that the initial compression of the elastic component 4 only needs to satisfy that the second mating surface 21 can abut against the first mating surface 112 along the axial direction when the valve is closed. Therefore, the design space of the elastic component 4 is also large, which can reduce the manufacturing cost of the pressure relief valve.

[0032] For actual setup, please refer to... Figure 1 The valve seat component 1 may be provided with an inlet channel 11b and an outlet channel 11c. Both the inlet channel 11b and the outlet channel 11c are connected to the cavity 1a. The inlet channel 11b extends axially into the cavity 1a to form the valve port 111. The valve port 111 forms the valve port 111a of the pressure limiting valve.

[0033] Please continue to refer to this. Figure 2 , Figure 2 This is a schematic diagram of the pressure relief valve in the embodiment provided in this application at the moment of valve opening. Figure 2In the diagram, the arrow indicates the direction of fluid flow at the instant the valve is opened.

[0034] The pressure relief valve provided in this application embodiment can be used in systems such as containers, pipelines, or equipment. In use, the inlet channel 11b is connected to the system outlet, allowing fluid inside the system to enter the inlet channel 11b. In the closed state, the sealing block 3 of the valve core component, under the elastic force of the elastic component 4, presses against the valve port 111, achieving a seal at the valve port 111a. When the fluid pressure inside the system increases, the end of the sealing block 3 near the valve port 111... Figure 1 The fluid pressure at the lower end of the valve core component is greater than that at the end furthest from the valve port 111. Figure 1 The sum of the elastic force and atmospheric pressure on the upper end of the valve core component creates a pressure difference between the lower and upper ends. This pressure difference pushes the sealing block 3 upwards, driving the valve core 2 to compress the elastic component 4. When the pressure difference reaches a preset value, such as... Figure 2 As shown, the fluid in the inlet channel 11b pushes upward to open the sealing block 3, causing the sealing block 3 to disengage from the valve port 111a. The elastic member 4 is then compressed upward, allowing the fluid in the inlet channel 11b to enter the cavity 1a through the valve port 111a and exit along the outlet channel 11c, thus reducing the pressure inside the system. When the pressure inside the system drops below a preset value, the elastic member 4 extends downward to reset, thereby driving the valve core 2 to reset the sealing block 3, pressing against the valve port 111 to restore the valve to a closed, sealed state. In this way, the pressure limiting valve provided in this embodiment can be used to limit the pressure inside the system within a preset range.

[0035] It is understood that the fluid described in this application can be a gas or a liquid, and there is no specific limitation.

[0036] Please continue to refer to this. Figures 3 to 6 , Figure 3 for Figure 1 A partial schematic diagram of the connection between the valve core component and the valve seat component. Figure 4 for Figure 1 Schematic diagram of the middle valve core component. Figure 5 for Figure 1 Schematic diagram of the middle valve core. Figure 6 for Figure 1 A schematic diagram of the structure of the central sealing block.

[0037] In actual setup, the first mating surface 112 in the valve seat component 1 and the second mating surface 21 in the valve core component form a first limiting mating structure, and the specific form of the first limiting mating structure is not limited.

[0038] As an optional solution, please refer to Figure 1 and Figure 3 The cavity 1a includes a first stepped countersunk hole 11a, please refer to... Figure 4The outer peripheral wall of the valve core 2 is provided with a first annular step 2b; the part of the wall defining the cavity 1a is the step surface corresponding to the first step countersunk hole 11a, and this step surface faces away from the valve port 111 to form a first mating surface 112, while the step surface of the first annular step 2b faces the valve port 111 to form a second mating surface 21. With this configuration, the first limiting mating structure is a stepped limiting mating structure, which can more stably limit the installation of the valve core component within the valve seat component 1, making it easier to control the compression deformation of the sealing block 3 at the valve port 111, further extending the service life of the sealing block 3 and ensuring its sealing performance.

[0039] Of course, the second mating surface 21 is not limited to the stepped surface of the first annular step 2b. For example, the outer peripheral wall of the valve core 2 can also be provided with a first annular boss. The first annular boss has a first boss end face facing the valve port 111, and the first boss end face forms the second mating surface 21. The first mating surface 112 and the second mating surface 21 are not limited to being annular, but the annular abutment fit is obviously more stable and reliable.

[0040] The valve core component provided in this embodiment is the main moving part for the sealing and drainage operation of the pressure relief valve. In actual installation, the valve core 2 can abut against the sealing block 3. The specific position of the sealing block 3 and the specific connection structure between it and the valve core 2 are not limited, as long as the elastic force of the elastic component 4 does not directly act on the sealing block 3.

[0041] As an optional solution, the valve core 2 has a third mating surface 22 and a fourth mating surface 23, and the sealing block 3 has a fifth mating surface 31 and a sixth mating surface 32; the fifth mating surface 31 abuts against the third mating surface 22 axially, and the sixth mating surface 32 abuts against the fourth mating surface 23 axially, so as to limit at least a portion of the sealing block 3 between the third mating surface 22 and the fourth mating surface 23. With this configuration, the fifth mating surface 31 and the third mating surface 22, as well as the sixth mating surface 32 and the fourth mating surface 23, form a second limiting fit structure, which can limit a portion of the sealing block 3 between the third mating surface 22 and the fourth mating surface 23, restricting the movement of the sealing block 3 towards and away from the valve port 111. In the closed state, based on the first limiting fit structure limiting the installation of the valve core component on the valve seat component 1, the sealing block 3 can also be limited on the valve core 2, thereby making it easier to control the compression deformation of the sealing block 3 at the valve port 111, further extending the service life of the sealing block 3, and ensuring the sealing performance of the sealing block 3.

[0042] Similar to the first limiting fit structure, the specific form of the second limiting fit structure is also not limited. For an example, please refer to... Figures 4 to 6The valve core 2 has a second stepped countersunk hole 2a at its end near the valve port 111, and the outer peripheral wall of the sealing block 3 has a second annular step 3a. The bottom surface of the second stepped countersunk hole 2a faces the valve port 111 and forms a third mating surface 22. The step surface corresponding to the second stepped countersunk hole 2a faces away from the valve port 111 and forms a fourth mating surface 23. The end face of the sealing block 3 away from the valve port 111 forms a fifth mating surface 31, and the step surface of the second annular step 3a faces the valve port 111 and forms a sixth mating surface 32. Thus, the second limiting fit structure is a stepped limiting fit structure, which can more stably limit the installation of the sealing block 3 on the valve core 2, making it easier to control the amount of compression deformation of the sealing block 3 at the valve port 111.

[0043] Similarly, the sixth mating surface 32 is not limited to the step surface of the second annular step 3a. For example, the outer peripheral wall of the sealing block 3 can also be provided with a second annular boss. The second annular boss has a second boss end face facing the valve port 111, and the second boss end face forms the sixth mating surface 32.

[0044] It can be seen that the matching method between sealing block 3 and valve core 2 is not limited to Figure 1 As shown, for example, the sealing block 3 can be provided with a stepped countersunk hole, and the lower end of the valve core 2 can also be provided with a stepped structure that is inserted into the stepped countersunk hole.

[0045] Please combine Figure 3 Understood, in the embodiments provided in this application, the valve port 111 has a first sealing surface 113, and the end face of the sealing block 3 near the valve port 111 is a second sealing surface 33. The second sealing surface 33 can abut against or move away from the first sealing surface 113. In the closed state, the distance from the second mating surface 21 to the second sealing surface 33 is defined as L1, the distance from the first mating surface 112 to the first sealing surface 113 is defined as L3, and the amount of compression deformation of the sealing block 3 at the valve port 111, that is, the distance from the second sealing surface 33 to the first sealing surface 113, is defined as L4. L1, L3, and L4 satisfy the following conditions:

[0046] L4 = L1 - L3 and L4 > 0.

[0047] This configuration allows the valve core component to be limited by the first limiting structure, while keeping the compression deformation of the sealing block 3 in the closed state greater than 0, thus ensuring the sealing performance of the sealing block 3.

[0048] In actual setup, the specific range of the compression deformation L4 of the sealing block 3 at the valve port 111 is not limited. For example, in the closed valve state, the distance from the fourth mating surface 23 to the second sealing surface 33 is defined as L2, and L2 and L4 can satisfy the following conditions:

[0049] L2 / 10 < L4 < 3L2 / 10.

[0050] Thus, based on the first limiting structure limiting the installation of the valve core component on the valve seat component 1, and the second limiting structure limiting the installation of the sealing block 3 in the valve core component on the valve core 2, the compression deformation L4 of the sealing block 3 is controlled between L2 / 10 and 3L2 / 10 by using the two limiting structures. This not only further ensures that the sealing block 3 will not deform excessively and extend its service life, but also ensures that the sealing block 3 has sufficient deformation to maintain good sealing performance. As a result, the sealing block 3 can meet the deformation requirement of not undergoing permanent deformation and also meet the sealing performance requirements for long-term use.

[0051] For specific settings, please refer to... Figure 4 In the embodiments provided in this application, a chamfer 25 can be provided between the inner side of the second mating surface 21 and the outer peripheral wall of the valve core 2, which can reduce stress concentration and effectively reduce the wear of the valve core 2 when the valve core 2 and the valve seat component 1 move relative to each other and collide, thus extending the service life of the valve core 2.

[0052] In a specific configuration, a fillet 114 can be provided on the inner side of the valve port 111 to effectively reduce wear on the sealing block 3 when it is compressed and deformed at the valve port 111a. Of course, a fillet 114 can also be provided on the outer side of the valve port 111, or a fillet 114 can be provided on both the inner and outer sides simultaneously to further reduce wear on the sealing block 3.

[0053] For specific settings, please refer to... Figures 4 to 6 In the sealing block 3, the portion between the sixth mating surface 32 and the fifth mating surface 31 forms a limiting part a1, and the remaining portion forms a sealing part a2. The limiting part a1 is embedded in the large hole of the second stepped countersunk hole 2a, and at least a portion of the sealing part a2 is located in the small hole of the second stepped countersunk hole 2a. The side surface 34 of the limiting part a1 can be an inclined surface, that is, the limiting part a1 is frustum-shaped, thereby forming a shape between the limiting part a1 and the inner wall of the second stepped countersunk hole 2a. Figure 4 The deformation space g shown provides additional space for the compression deformation of the sealing block 3.

[0054] In the embodiments provided in this application, please refer to Figure 3 and Figure 5 The valve seat component 1 has at least one outlet channel 11c. The first end of the outlet channel 11c communicates with the cavity 1a, and the first end of the outlet channel 11c is located on the side of the valve port 111 near the valve core 2. The end of the valve core 2 near the valve port 111 has a third annular step 2c on its outer peripheral wall. The third annular step 2c has a first step surface 24 facing the valve port 111, so as to form a flow gap e between the end of the valve core 2 near the valve port 111 and the inner wall of the cavity 1a. Please refer to [reference needed] for this configuration. Figure 2 and Figure 3At the instant the pressure relief valve opens, after the fluid enters the cavity 1a from the inlet channel 11b, the flow gap e makes way for the fluid to flow to the outlet channel 11c, so that the fluid can quickly pass through the flow gap e and continue to flow out from the outlet channel 11c, increasing the instantaneous discharge volume of the pressure relief valve, thereby rapidly reducing the pressure of the system connected to the pressure relief valve and improving the pressure relief effect of the pressure relief valve.

[0055] In specific settings, the size of the flow gap e is not limited. For example, in the closed state, the lowest point of the first end of the outflow channel 11c is defined as the point closest to the valve port 111. The lowest point can be located between the valve port 111 and the first step surface 24. In this way, at the moment the pressure relief valve opens, the flow gap e can make more room for the flow of fluid to the outflow channel 11c, further improving the instantaneous discharge capacity of the pressure relief valve.

[0056] For specific settings, please refer to... Figure 3 Multiple outflow channels 11c can be provided, and the multiple outflow channels 11c can be evenly distributed along the circumference of the valve seat component 1. At the moment the pressure relief valve opens, the fluid entering the cavity 1a can flow out from the multiple outflow channels 11c, thereby further improving the instantaneous discharge volume of the pressure relief valve.

[0057] In addition, please refer to Figure 1 , Figure 3 and Figure 4 In the embodiments provided in this application, the valve core 2 has an upper end face 27. The portion of the valve core 2 located between the second mating surface 21 and the upper end face 27 is the upper part, the portion of the valve core 2 located between the second mating surface 21 and the first step surface 24 is the middle part, and the portion of the valve core 2 located below the first step surface 24 is the lower part. The upper part of the valve core 2 is at least partially located within the large hole of the first step countersunk hole 11a, while the middle and lower parts are located within the small hole of the first step countersunk hole 11a. The valve core component can move up and down within the cavity 1a, forming a straight-through form, which shortens the opening response time of the pressure relief valve and improves the pressure relief efficiency. The diameter of the middle part of the valve core 2 can be smaller than the inner diameter of the small hole of the first step countersunk hole 11a, so as to form a guide gap between the outer wall of the middle part of the valve core 2 and the inner wall of the small hole of the first step countersunk hole 11a. Controlling the guide gap within a suitable range can provide guidance for the movement of the valve core 2, making the opening and closing process of the pressure relief valve more stable.

[0058] Please continue to refer to this. Figures 7 to 9 , Figure 7 for Figure 1 Schematic diagram of the middle valve seat component. Figure 8 for Figure 1 Schematic diagram of the middle valve seat. Figure 9 for Figure 1 A schematic diagram of the structure of the middle cover.

[0059] The valve seat component 1 provided in this application embodiment is used to set up various flow channels, guide and limit the valve core component, and support the elastic component 4. The specific structure of its valve seat 11 and cover 12 is not limited.

[0060] As an optional solution, please refer to Figure 7 and Figure 8 The valve seat 11 has a first stepped countersunk hole 11a; please refer to Figure 9 The cover 12 has an inner cavity 12a; please refer to Figure 7 One end of the valve seat 11 is inserted axially into the inner cavity 12a and welded to the cover 12. The cavity 1a includes a first stepped countersunk hole 11a and an inner cavity 12a. Please refer to... Figure 1 and Figure 7 The valve core 2 is at least partially located in the first step countersunk hole 11a. The cover 12 has a top wall 121 facing the valve core 2. A groove 2d is provided at the end of the valve core 2 near the cover 12. One side of the elastic member 4 abuts against the bottom surface 26 of the groove 2d, and the other side of the elastic member 4 abuts against the top wall 121 of the cover 12. The cover 12 has at least one drainage channel 12b, which communicates with the inner cavity 12a.

[0061] With this configuration, after the valve core component is installed into the valve seat 11, the elastic component 4 is installed on the valve core 2, and then the cover 12 is welded and fixed to the valve seat 11. This makes the structure of the valve seat component 1 more stable. Correspondingly, the bottom surface 26 of the groove 2d and the top wall 121 of the cover 12 limit the installation of the elastic component 4 between the valve core 2 and the cover 12, so that the elastic component 4 is stably installed between the valve core 2 and the cover 12. This makes the deformation of the elastic component 4 more stable during the movement of the valve core 2. In addition, the first limiting fit structure stabilizes the installation of the valve core component on the valve seat component 1, and the second limiting fit structure stabilizes the installation of the sealing block 3 on the valve core 2, which is more conducive to controlling the compression deformation of the sealing block 3 within the preset range. Furthermore, the drainage channel 12b in the cover 12 can quickly balance the pressure in the upper part of the cavity 1a when the pressure relief valve is pushed open by the fluid and the valve core component moves upward.

[0062] In actual installation, the specific welding method between valve seat 11 and cover 12 is not limited. For example, laser welding can be used, which has a fast welding speed, large depth, and small deformation, making the connection between valve seat 11 and cover 12 more stable.

[0063] Please refer to Figure 8 The inlet channel 11b can be set in the lower part of the valve seat 11, the first step countersunk hole 11a is opened in the upper part of the valve seat 11, the inlet channel 11b extends upward along the axial direction to form the valve port 111, and multiple outlet channels 11c can be evenly distributed along the circumference of the valve seat 11.

[0064] The elastic component 4 provided in this embodiment is used to balance the fluid pressure inside the system connected to the pressure relief valve. It is made of an elastic material, capable of deforming under external force and returning to its original shape after the external force disappears, thereby causing displacement of the connected structural components to reset. It can be a rubber component, or something similar. Figure 1 The image shown is of a spring, but this application does not limit its application.

[0065] The valve seat 11 and cover 12 in the valve seat component 1 provided in this application embodiment, as well as the valve core 2 in the valve core component and the spring, are not limited in material. For example, they can be made of stainless steel, which has high corrosion resistance and can be applied in working environments with corrosive fluids. Moreover, it has high strength and is not easily deformed during the relative movement of opening and closing the valve, thus extending the service life of the pressure relief valve.

[0066] The sealing block 3 provided in this application embodiment can be made of an elastic material, specifically spring steel, thermoplastic elastomer, or rubber. This application does not limit the type of material. Alternatively, the sealing block 3 can be made of rubber, which not only possesses good elasticity and deformation recovery capabilities, allowing for stable deformation when pressed against the valve port 111 to stably seal the valve port 111a and prevent fluid leakage when the valve is closed, but also rapidly recovers its deformation upon opening the valve to quickly open the valve port 111a, allowing excess fluid inside the system to drain quickly. Furthermore, it exhibits good wear resistance, oxidation resistance, and corrosion resistance, enabling long-term use in harsh environments and improving the reliability and applicability of the pressure relief valve.

[0067] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the apparatus and core ideas of this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the principles of this application, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. A pressure relief valve, characterized in that, It includes a valve seat component (1), a valve core component and an elastic component (4), wherein the valve core component includes a valve core (2) and a sealing block (3) connected to the valve core (2); The valve seat component (1) is provided with a cavity (1a), and the valve core component and the elastic component (4) are located in the cavity (1a); the valve seat component (1) includes a valve seat (11) and a cover (12) connected to the valve seat (11); one side of the elastic component (4) abuts against the valve core (2), and the other side abuts against the cover (12); the valve seat (11) is provided with a valve port (111), and the sealing block (3) can abut against or move away from the valve port (111); The valve seat (11) has a first mating surface (112), and the valve core (2) has a second mating surface (21). When the valve is closed, the second mating surface (21) abuts against the first mating surface (112) along the axial direction, and the sealing block (3) abuts against the valve port (111).

2. The pressure relief valve according to claim 1, characterized in that, The valve core (2) has a third mating surface (22) and a fourth mating surface (23), and the sealing block (3) has a fifth mating surface (31) and a sixth mating surface (32). The fifth mating surface (31) abuts against the third mating surface (22) axially, and the sixth mating surface (32) abuts against the fourth mating surface (23) axially, so that at least a portion of the sealing block (3) is confined between the third mating surface (22) and the fourth mating surface (23).

3. The pressure relief valve according to claim 2, characterized in that, The cavity (1a) includes a first stepped countersunk hole (11a), and the outer peripheral wall of the valve core (2) is provided with a first annular step (2b) or a first annular boss; The step surface corresponding to the first stepped countersunk hole (11a) faces away from the valve port (111) and forms the first mating surface (112); the step surface of the first annular step (2b) faces the valve port (111) and forms the second mating surface (21), or the first annular boss has a first boss end face facing the valve port (111), and the first boss end face forms the second mating surface (21).

4. The pressure relief valve according to claim 3, characterized in that, The valve core (2) has a second stepped countersunk hole (2a) at the end near the valve port (111), and the outer peripheral wall of the sealing block (3) has a second annular step (3a) or a second annular boss. The bottom surface of the second stepped countersunk hole (2a) faces the valve port (111) and forms the third mating surface (22); the stepped surface corresponding to the second stepped countersunk hole (2a) faces away from the valve port (111) and forms the fourth mating surface (23); the end face of the sealing block (3) away from the valve port (111) forms the fifth mating surface (31); the stepped surface of the second annular step (3a) faces the valve port (111) and forms the sixth mating surface (32), or, the second annular boss has a second boss end face facing the valve port (111), and the second boss end face forms the sixth mating surface (32).

5. The pressure relief valve according to claim 4, characterized in that, The valve port (111) has a first sealing surface (113), and the end face of the sealing block (3) near the valve port (111) is a second sealing surface (33). The second sealing surface (33) can abut against or move away from the first sealing surface (113). In the closed state, the distance from the second mating surface (21) to the second sealing surface (33) is defined as L1, the distance from the first mating surface (112) to the first sealing surface (113) is defined as L3, and the compression deformation of the sealing block (3) at the valve port (111) is defined as L4. L1, L3 and L4 satisfy the following conditions: L4 = L1 - L3 and L4 > 0.

6. The pressure relief valve according to claim 5, characterized in that, With the valve closed, the distance from the fourth mating surface (23) to the second sealing surface (33) is defined as L2, and L2 and L4 satisfy the following conditions: L2 / 10 < L4 < 3L2 / 10.

7. The pressure relief valve according to claim 3, characterized in that, A chamfer (25) is provided between the inner side of the second mating surface (21) and the outer peripheral wall of the valve core (2); and / or, a rounded corner (114) is provided on the inner and / or outer side of the valve port (111).

8. The pressure relief valve according to any one of claims 1 to 7, characterized in that, The valve seat component (1) has at least one outlet channel (11c), the first end of the outlet channel (11c) is connected to the cavity (1a), and the first end of the outlet channel (11c) is located on the side of the valve port (111) near the valve core (2). The valve core (2) has a third annular step (2c) on its outer peripheral wall at the end near the valve port (111). The third annular step (2c) has a first step surface (24) facing the valve port (111) to form a flow gap (e) between the end of the valve core (2) near the valve port (111) and the inner wall of the cavity (1a).

9. The pressure relief valve according to claim 8, characterized in that, With the valve closed, the lowest point of the first end of the outflow channel (11c) is defined as the point closest to the valve port (111), and the lowest point is located between the valve port (111) and the first step surface (24); and / or, There are multiple outflow channels (11c), and the multiple outflow channels (11c) are evenly distributed along the circumference of the valve seat component (1).

10. The pressure relief valve according to any one of claims 1 to 7, characterized in that, The valve seat (11) has a first stepped countersunk hole (11a), the cover (12) has an inner cavity (12a), one end of the valve seat (11) is inserted into the inner cavity (12a) along the axial direction and welded to the cover (12). The cavity (1a) includes the first stepped countersunk hole (11a) and the inner cavity (12a). The valve core (2) is at least partially located in the first stepped countersunk hole (11a). The cover (12) has a top wall (121) facing the valve core (2). A groove (2d) is provided at the end of the valve core (2) near the cover (12). One side of the elastic member (4) abuts against the bottom surface (26) of the groove (2d). The other side of the elastic member (4) abuts against the top wall (121) of the cover (12). The cover (12) has at least one drainage channel (12b) that communicates with the inner cavity (12a).

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