Safety valve

Abstract

The safety valve comprises a valve seat, an elastic assembly and a valve element, the valve seat is provided with a containing cavity, an air inlet and an air outlet, the inner wall of the containing cavity is provided with an abutting part, the abutting part is provided with an inner chamfer, the elastic assembly and the valve element are arranged in the containing cavity, one end of the valve element abuts against the elastic assembly, and the other end of the valve element abuts against the air inlet. The other end of the valve element is provided with a hemispherical sealing surface, the hemispherical sealing surface is matched with the abutting part, the valve element can move between a first position and a second position, and when the valve element is located at the first position, the hemispherical sealing surface is in close contact with the abutting part to form a sealing surface, so that a passage between the air inlet and the air outlet is closed; when the valve element is stressed to move to the second position, the hemispherical sealing face is separated from the abutting part, and a channel between the air inlet and the air outlet is opened. According to the application, the semispherical sealing surface of the valve core is matched with the inner chamfer of the abutting part, so that impurities in fluid are difficult to attach to the surface of the valve core.

Description

[Technical field]

[0001] The present application relates to the field of valve technology, and in particular to a safety valve with a ball seal. [Background technology]

[0002] The safety valve is a special device used for overpressure protection of pressure systems. It is an automatic valve. When the system pressure reaches the set pressure, it does not rely on any external force, but uses the force of the medium itself to discharge a certain rated amount of fluid to prevent the pressure in the system from exceeding the predetermined safety value. When the pressure returns to normal, the valve will close again to prevent the medium from continuing to flow out.

[0003] However, in the long-term operation of the water system, when there are more impurities in the medium, impurities often adhere to the safety valve sealing ring or its valve disc after the safety valve is opened, causing the safety valve to open prematurely or delay opening, which directly affects the normal operation of the system. Therefore, it is particularly important to prevent impurities from adhering to the safety valve sealing surface. [Summary of the invention]

[0004] In order to overcome the problems existing in the above-mentioned related technologies, the main purpose of the present application is to provide a safety valve capable of preventing impurities from adhering to the sealing surface of the safety valve.

[0005] In order to achieve the above objectives, this application specifically adopts the following technical solutions:

[0006] The present application provides a safety valve, the safety valve comprising:

[0007] A valve seat, wherein the valve seat is provided with a containing cavity, an air inlet and an air outlet, an inner wall of the containing cavity is provided with an abutment portion, and the abutment portion is provided with an inner chamfer;

[0008] an elastic component, the elastic component being disposed in the accommodating cavity; and

[0009] A valve core, wherein the valve core is movably disposed in the accommodating cavity, and one end of the valve core abuts against the elastic component, and the other end of the valve core is provided with a hemispherical sealing surface, and the hemispherical sealing surface is matched with the abutting portion;

[0010] In which, the valve core can move between a first position and a second position. When the valve core is located at the first position, the hemispherical sealing surface is in close contact with the abutment portion to form a sealing surface, so that the passage between the air inlet and the air outlet is closed. When the valve core is forced to move to the second position, the hemispherical sealing surface is separated from the abutment portion, so that the passage between the air inlet and the air outlet is opened.

[0011] In some embodiments, the inner chamfer is located on a side of the abutting portion close to the hemispherical sealing surface.

[0012] In one embodiment, the valve seat includes a valve body and a valve cover, the valve body is provided with a first installation cavity, the air inlet and the air outlet, the inner wall of the first installation cavity is provided with the abutment portion, the air inlet and the air outlet are respectively communicated with the first installation cavity, the valve cover is provided with a second installation cavity, and one end of the valve cover is inserted into the first installation cavity and sealedly connected to the inner wall of the first installation cavity, so that the second installation cavity and the first installation cavity form the accommodating cavity, the elastic component is arranged in the second installation cavity, one end of the valve core provided with the hemispherical sealing surface is located in the first installation cavity, and one end of the valve core away from the hemispherical sealing surface is sealedly connected to the inner wall of the second installation cavity and abuts against the elastic component.

[0013] In one embodiment, a limiting portion is provided at one end of the valve cover inserted into the first installation cavity, and the valve core further includes a limiting protrusion;

[0014] When the valve core is located at the first position, the hemispherical sealing surface abuts against the abutment portion, and when the valve core moves to the second position, the limiting protrusion abuts against the limiting portion.

[0015] In one embodiment, the safety valve further includes a sealing packing, which is arranged on the inner wall of the first installation cavity and is provided with the abutting portion.

[0016] In one embodiment, the safety valve further includes a combined gasket, which is disposed on the inner wall of the first installation cavity and is provided with the abutment portion.

[0017] In one embodiment, the safety valve further comprises a sealing member, and the sealing member is attached to the surface of the hemispherical sealing surface.

[0018] In one embodiment, the valve cover is provided with a vent hole, and the vent hole is communicated with the second installation cavity.

[0019] In one embodiment, the safety valve further includes a nut and an adjusting screw, wherein the nut is connected to one end of the valve cover away from the valve body, and the adjusting screw is threadedly connected to the nut and penetrates into the accommodating cavity to abut against the elastic component.

[0020] In one embodiment, the elastic component includes a first spring seat, a second spring seat and a spring, the first spring seat, the second spring seat and the spring are respectively arranged in the accommodating cavity, and the spring is located between the first spring seat and the second spring seat, one end of the spring is connected to the first spring seat, and the other end of the spring is connected to the second spring seat, the valve core abuts against the second spring seat, and the adjusting screw abuts against the first spring seat.

[0021] In one embodiment, the safety valve further comprises a dust cap, which is connected to an end of the valve cover away from the valve body and covers the nut and the adjusting screw.

[0022] The safety valve of the present application includes a valve seat, an elastic component and a valve core, the valve seat is provided with a accommodating portion, an air inlet and an air outlet, the inner wall of the accommodating cavity is provided with an abutting portion, the abutting portion is provided with an inner chamfer, the elastic component is arranged in the accommodating cavity, the valve core is movably arranged in the accommodating cavity, and one end of the valve core is abutted with the elastic component, and the other end of the valve core is provided with a hemispherical sealing surface, and the hemispherical sealing surface is cooperated with the abutting portion, wherein the valve core can move between a first position and a second position, when the valve core is located at the first position, the hemispherical sealing surface is in close contact with the abutting portion to form a sealing surface, so that the passage between the air inlet and the air outlet is closed, and when the valve core is forced to move to the second position, the hemispherical sealing surface is separated from the abutting portion, so that the passage between the air inlet and the air outlet is opened. Compared with the prior art, the sealing surface of the valve core is set to a hemispherical structure in the present application because the spherical surface is smooth and impurities in the fluid are difficult to adhere to its surface. At the same time, when the safety valve is opened, it discharges the liquid quickly with a certain pressure. If a small amount of impurities are attached to the spherical surface, the adhesion force is small due to the smooth spherical surface. The impurities will be quickly discharged with the discharge and will be difficult to adhere to the surface of the sphere. At the same time, the abutting portion that cooperates with the hemispherical sealing surface is provided with an inner chamfer because the inner chamfer and the hemispherical sealing surface are closely matched to form a sealing effect, and when the safety valve is opened, the fluid carries a certain pressure, which pushes open the valve core and moves it upward. The inner chamfer on the abutting portion has a good flow guiding effect, and cooperates with the hemispherical sealing surface to make it difficult for impurities in the fluid to adhere to its surface.

Brief Description of the Drawings

[0023] Figure 1 A cross-sectional view of a safety valve provided in an embodiment of the present application.

[0024] Figure 2 for Figure 1 A partial enlarged view of the safety valve in the closed state.

[0025] Figure 3 for Figure 1 A partial enlarged view of the safety valve in the open state.

[0026] Figure 4 This is a partially enlarged view of a safety valve provided in another embodiment of the present application.

[0027] Figure 5 A partially enlarged view of a safety valve provided in yet another embodiment of the present application.

[0028] Figure 6 for Figure 1 A partial enlarged view of the safety valve.

[0029] Figure 7 for Figure 1 Another partial enlarged view of the safety valve.

[0030] Figure ID:

[0031] 1. Valve body; 11. Air inlet; 12. Air outlet; 13. First installation cavity; 2. Valve cover; 21. Second installation cavity; 22. Limiting part; 23. Air vent; 3. Elastic component; 31. First spring seat; 311. First limiting recess; 312. First limiting column; 32. Second spring seat; 321. Second limiting recess; 322. Second limiting column; 33. Spring; 4. Valve core; 41. Hemispherical sealing surface; 42. Limiting protrusion; 43. Second limiting protrusion; 5. Sealing packing; 6. Combined gasket; 7. Sealing element; 8. Nut; 9. Adjusting screw; 91. First limiting protrusion; 10. Dust cap; 100. Abutment part; 100a. Inner chamfer; 101. First sealing ring; 102. Second sealing ring. [Specific implementation method]

[0032] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0035] A safety valve is a special valve whose opening and closing parts are in a normally closed state under the action of external forces. When the medium pressure in the equipment or pipeline increases to exceed the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. The sealing structure of the safety valve currently used in the market is a sealing ring embedded on the valve disc. During use, because the water quality of the application conditions cannot guarantee its cleanliness, impurities will adhere to the sealing surface of the safety valve after repeated opening and closing, resulting in poor sealing of the safety valve, which will cause the safety valve set pressure to open early or delay opening, causing system pressure loss or high-pressure operation. This situation is not allowed for strict system applications. Therefore, the inventor of the present application proposed a ball-sealed safety valve in the study. The safety valve is structurally optimized on the sealing end face of the safety valve, so that the problem of abnormal opening of the safety valve set pressure due to impurities attached to the sealing surface of the safety valve can be solved to a certain extent.

[0036] Reference Figure 1 As shown, the safety valve includes a valve seat, an elastic component 3 and a valve core 4. The valve seat includes a valve body 1 and a valve cover 2. The valve body 1 is provided with an air inlet 11 and an air outlet 12. The valve cover 2 is sealed and connected to the valve body 1 to form an accommodating cavity. The elastic component 3 is arranged in the accommodating cavity, the valve core 4 is movably arranged in the accommodating cavity and is sealed and connected to the inner wall of the accommodating cavity, and one end of the valve core 4 abuts against the elastic component 3, and the other end of the valve core 4 has a hemispherical sealing surface 41. Among them, the valve core 4 can slide up and down in the accommodating cavity under force, so that the valve core 4 has a first position and a second position to open or close the safety valve. Exemplarily, when the valve core 4 is in the first position, the hemispherical sealing surface 41 cooperates with the valve body 1 and closes the passage between the air inlet 11 and the air outlet 12, so that the safety valve is closed; when the valve core 4 is forced to move to the second position, the hemispherical sealing surface 41 opens the passage between the air inlet 11 and the air outlet 12, so that the safety valve is opened.

[0037] Specifically, a first installation cavity 13 is further provided in the valve body 1, and an abutment portion 100 is provided on the inner wall of the first installation cavity 13, and an inner chamfer 100a is provided on the side of the abutment portion 100 close to the hemispherical sealing surface 41. The air inlet 11 is located at the bottom of the valve body 1, and the air outlet 12 is located at the side of the valve body 1, and the air inlet 11 and the air outlet 12 are respectively connected to the first installation cavity 13, so that gas can flow into the air inlet 11 and flow through the first installation cavity 13 and then flow out from the air outlet 12. A second installation cavity 21 is provided in the valve cover 2, and one end of the valve cover 2 is inserted into the first installation cavity 13 and is sealed and connected to the inner wall of the first installation cavity 13, so that the second installation cavity 21 and the first installation cavity 13 form a receiving cavity.

[0038] The elastic component 3 includes a first spring seat 31, a second spring seat 32 and a spring 33, which are respectively arranged in the second installation cavity 21, and the spring 33 is located between the first spring seat 31 and the second spring seat 32, one end of the spring 33 is connected to the first spring seat 31, and the other end of the spring 33 is connected to the second spring seat 32. One end of the valve core 4 is inserted into the second installation cavity 21 and is sealedly connected to the inner wall of the second installation cavity 21, and one end of the valve core 4 inserted into the second installation cavity 21 abuts against the second spring seat 32, one end of the valve core 4 having a hemispherical sealing surface 41 is located in the first installation cavity 13, and the hemispherical sealing surface 41 of the valve core 4 is arranged in cooperation with the abutment portion 100 of the inner wall of the first installation cavity 13.

[0039] When the pressure at the air inlet 11 is lower than the set pressure of the safety valve, under the elastic force of the spring 33, the hemispherical sealing surface 41 of the valve core 4 is in close contact with the abutment portion 100 of the inner wall of the first installation cavity 13 to form a sealing surface, closing the passage between the air inlet 11 and the air outlet 12, so that the safety valve is in a closed state. When the pressure at the air inlet 11 is higher than the set pressure of the safety valve, the valve core 4 moves the spring 33 away from the valve body 1, so that the hemispherical sealing surface 41 of the valve core 4 is separated from the abutment portion 100 of the inner wall of the first installation cavity 13, opening the passage between the air inlet 11 and the air outlet 12, so that the safety valve is in an open state.

[0040] The sealing surface of the valve core 4 is set as a hemispherical structure in the present application because the spherical surface is smooth and impurities in the fluid are difficult to adhere to its surface. At the same time, when the safety valve is opened, it discharges the liquid quickly with a certain pressure. If a small amount of impurities are attached to the spherical surface, the adhesion force is small due to the smooth spherical surface. The impurities will be quickly discharged with the discharge and will be difficult to adhere to the surface of the sphere. At the same time, the abutment portion 100 that cooperates with the hemispherical sealing surface 41 is provided with an inner chamfer 100a because the inner chamfer and the hemispherical sealing surface 41 are closely matched to form a sealing effect, and when the safety valve is opened, the fluid carries a certain pressure, which pushes open the valve core 4 and moves it upward. The inner chamfer on the abutment portion 100 has a good flow-guiding effect, and cooperates with the hemispherical sealing surface 41 to make it difficult for impurities in the fluid to adhere to its surface.

[0041] In order to improve the sealing performance between the valve cover 2 and the valve body 1 and the sealing performance between the valve core 4 and the valve cover 2, the safety valve further includes a first sealing ring 101 and a second sealing ring 102. The first sealing ring 101 is sleeved on the valve cover 2, and the first sealing ring 101 is in close contact with the outer surface of the valve cover 2 on one hand, and the first sealing ring 101 is in close contact with the inner wall of the first installation cavity 13 on the other hand, so that the first sealing ring 101 can effectively prevent the fluid from flowing out from the connection between the valve cover 2 and the valve body 1. The second sealing ring 102 is sleeved on the valve core 4, and the second sealing ring 102 is in close contact with the outer surface of the valve core 4 on one hand, and the second sealing ring 102 is in close contact with the inner wall of the second installation cavity 21 on the other hand, so that the second sealing ring 102 can effectively prevent the fluid from entering the cavity where the spring 33 is located. The first sealing ring 101 and the second sealing ring 102 can be O-rings.

[0042] In this embodiment, refer to Figure 2 and Figure 3 As shown, the safety valve further includes a sealing packing 5, which is arranged on the inner wall of the first installation cavity 13, and an abutting portion 100 is provided at the end of the sealing packing 5, and the abutting portion 100 is chamfered on the side of the abutting portion 100 close to the hemispherical sealing surface 41, so that the abutting portion 100 has an inner chamfer 100a. A limiting portion 22 is provided at one end of the valve cover 2 inserted into the first installation cavity 13, and the valve core 4 also includes a limiting protrusion 42. When the valve core 4 is located at the first position, the hemispherical sealing surface 41 of the valve core 4 is in close contact with the abutting portion 100 of the sealing packing 5 to form a sealing surface, so that the passage between the air inlet 11 and the air outlet 12 is disconnected, and the safety valve is closed; when the valve core 4 moves to the second position, the hemispherical sealing surface 41 of the valve core 4 is separated from the abutting portion 100 of the sealing packing 5, and the limiting protrusion 42 abuts against the limiting portion 22, so that the passage between the air inlet 11 and the air outlet 12 is connected, and the safety valve is opened.

[0043] Among them, the inner chamfer 100a is a slope structure, which is inclined relative to the central axis of the valve core 4, and the distance between the end of the slope close to the elastic component 3 and the central axis of the valve core 4 is greater than the distance between the end of the slope away from the elastic component 3 and the central axis of the valve core 4.

[0044] In this embodiment, the sealing filler 5 can be fixed to the inner wall of the first installation cavity 13 by means of interference fit, and the interference amount can be 10% to 15% of the wall thickness of the sealing filler 5. In this embodiment, the sealing filler 5 is fixed to the inner wall of the first installation cavity 13 by means of interference fit, and its installation structure is simple and low in cost. It can be understood that in other embodiments, the sealing filler 5 can also be fixed to the inner wall of the first installation cavity 13 by means of a card slot. For example, the inner wall of the first installation cavity 13 can be provided with a limiting groove, and the sealing filler 5 is assembled in the limiting groove.

[0045] In some embodiments, reference Figure 4 As shown, the safety valve may also include a combination gasket 6, which is arranged on the inner wall of the first installation cavity 13, and the combination gasket 6 is provided with an abutment portion 100, and the abutment portion 100 is provided with an inner chamfer. The combination gasket 6 can be fixed to the inner wall of the first installation cavity 13 by means of a slot fixing method. For example, a limiting groove can be provided on the inner wall of the first installation cavity 13, and then the combination gasket 6 is assembled in the limiting groove. When the valve core 4 is located at the first position, the hemispherical sealing surface 41 of the valve core 4 abuts against the abutment portion 100 of the combination gasket 6, so that the passage between the air inlet 11 and the air outlet 12 is disconnected, and the safety valve is closed; when the valve core 4 moves to the second position, the hemispherical sealing surface 41 of the valve core 4 is separated from the abutment portion 100 of the combination gasket 6, and the limiting protrusion 42 abuts against the limiting portion 22, so that the passage between the air inlet 11 and the air outlet 12 is connected, and the safety valve is opened.

[0046] In other embodiments, reference Figure 5 As shown, the safety valve may also include a seal 7, which is attached to the surface of the hemispherical sealing surface 41 of the valve core 4, wherein the seal 7 can be connected to the valve core 4 by vulcanization bonding to form an integral structure. When the valve core 4 is located at the first position, the seal 7 abuts against the abutment portion 100 of the inner wall of the first installation cavity 13, so that the passage between the air inlet 11 and the air outlet 12 is disconnected, and the safety valve is closed; when the valve core 4 moves to the second position, the seal 7 is separated from the abutment portion 100 of the inner wall of the first installation cavity 13, and the limiting protrusion 42 abuts against the limiting portion 22, so that the passage between the air inlet 11 and the air outlet 12 is connected, and the safety valve is opened.

[0047] In order to ensure that the set pressure of the safety valve is not affected, a vent hole 23 is further provided on the valve cover 2, and the vent hole 23 is connected to the second installation cavity 21 to facilitate the discharge of air in the second installation cavity 21. Because, when the valve core 4 moves from the first position to the second position, the spring 33 will be compressed, the air volume in the second installation cavity 21 will also be compressed, and the air pressure in the second installation cavity 21 will increase. At this time, it is necessary to discharge the excess air pressure in the second installation cavity 21 through the vent hole 23 to avoid affecting the set pressure of the safety valve.

[0048] Continue to refer to Figure 1As shown, the safety valve further includes a nut 8 and an adjusting screw 9, wherein the nut 8 is connected to one end of the valve cover 2 away from the valve body 1, and the adjusting screw 9 is threadedly connected to the nut 8 and penetrates into the second installation cavity 21 to abut against the first spring seat 31, so that the elastic force of the spring 33 can be adjusted by the cooperation of the adjusting screw 9 with the first spring seat 31 and the second spring seat 32. For example, by rotating the adjusting screw 9, the distance that the adjusting screw 9 extends into the second installation cavity 21 can be adjusted, thereby adjusting the compression amount of the spring 33, that is, adjusting the elastic force of the spring 33, so that when the valve core 4 is in the first position, the hemispherical sealing surface 41 and the abutting portion 100 remain in a sealed connection state, thereby improving the stability of the safety valve. The nut 8 can be a hexagonal nut 8.

[0049] Reference Figure 6 and Figure 7 As shown, in order to facilitate the limiting of the first spring seat 31 and the second spring seat 32, a first limiting recess 311 is provided on the side of the first spring seat 31 facing the adjusting screw 9, and a second limiting recess 321 is provided on the side of the second spring seat 32 facing the valve core 4. A first limiting convex portion 91 is provided on the end of the adjusting screw 9 facing the first spring seat 31, and the first limiting convex portion 91 cooperates with the first limiting recess 311 to limit the first spring seat 31. A second limiting convex portion 43 is provided on the end of the valve core 4 facing the second spring seat 32, and the second limiting convex portion 43 cooperates with the second limiting recess 321 to limit the second spring seat 32.

[0050] In order to facilitate the limiting of the spring 33, a first limiting column 312 is provided on the side of the first spring seat 31 facing the spring 33, and a second limiting column 322 is provided on the side of the second spring seat 32 facing the spring 33. One end of the spring 33 is sleeved on the first limiting column 312, and the other end of the spring 33 is sleeved on the second limiting column 322, so that the spring 33 can be limited by the first limiting column 312 and the second limiting column 322.

[0051] In order to ensure the smooth rotation of the adjusting screw 9, the safety valve also includes a dust cap 10, which is connected to the end of the valve cover 2 away from the valve body 1 and covers the nut 8 and the adjusting screw 9 to prevent dust from falling into the connection between the adjusting screw 9 and the nut 8 and affecting the rotation of the adjusting screw 9.

[0052] In this application, before the safety valve is opened, the medium is in a full liquid state, and impurities are generally floating. The medium contacts the hemispherical sealing surface 41, making it difficult for impurities to adhere to the hemispherical sealing surface 41; when the safety valve reaches a certain pressure, it opens, and because the lower end sealing structure is an inner chamfer and the spherical shape is a smooth convex surface, the medium is quickly discharged out of the safety valve. Compared with the related art, the structural optimization of the valve core 4 of this application can effectively prevent impurities from adhering to the sealing surface, thereby solving the problem of premature pressure relief of the safety valve due to impurities to a certain extent, and can better ensure the normal operation of the safety valve.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application is described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A safety valve, characterized in that: include: A valve seat, wherein the valve seat is provided with a containing cavity, an air inlet and an air outlet, an inner wall of the containing cavity is provided with an abutment portion, and the abutment portion is provided with an inner chamfer; an elastic component, the elastic component being disposed in the accommodating cavity; and A valve core, wherein the valve core is movably disposed in the accommodating cavity, and one end of the valve core abuts against the elastic component, and the other end of the valve core is provided with a hemispherical sealing surface, and the hemispherical sealing surface is matched with the abutting portion; In which, the valve core can move between a first position and a second position. When the valve core is located at the first position, the hemispherical sealing surface is in close contact with the abutment portion to form a sealing surface, so that the passage between the air inlet and the air outlet is closed. When the valve core is forced to move to the second position, the hemispherical sealing surface is separated from the abutment portion, so that the passage between the air inlet and the air outlet is opened.

2. The safety valve according to claim 1, characterized in that: The inner chamfer is located on a side of the abutting portion close to the hemispherical sealing surface.

3. The safety valve according to claim 1, characterized in that: The valve seat comprises a valve body and a valve cover, the valve body is provided with a first installation cavity, the air inlet and the air outlet, the inner wall of the first installation cavity is provided with the abutment portion, the air inlet and the air outlet are respectively communicated with the first installation cavity, the valve cover is provided with a second installation cavity, and one end of the valve cover is inserted into the first installation cavity and is sealedly connected with the inner wall of the first installation cavity, so that the second installation cavity and the first installation cavity form the accommodating cavity; The elastic component is arranged in the second installation cavity, the end of the valve core provided with the hemispherical sealing surface is located in the first installation cavity, and the end of the valve core away from the hemispherical sealing surface is sealed and connected to the inner wall of the second installation cavity and abuts against the elastic component.

4. The safety valve according to claim 3, characterized in that: One end of the valve cover inserted into the first installation cavity is provided with a limiting portion, and the valve core also includes a limiting protrusion; When the valve core is located at the first position, the hemispherical sealing surface abuts against the abutment portion, and when the valve core moves to the second position, the limiting protrusion abuts against the limiting portion.

5. The safety valve according to claim 3, characterized in that: The safety valve further includes a sealing packing, which is arranged on the inner wall of the first installation cavity and is provided with the abutting portion.

6. The safety valve according to claim 3, characterized in that: The safety valve further comprises a combined gasket, which is arranged on the inner wall of the first installation cavity and is provided with the abutting portion.

7. The safety valve according to claim 3, characterized in that: The safety valve further comprises a sealing member, which is attached to the surface of the hemispherical sealing surface.

8. The safety valve according to claim 3, characterized in that: The valve cover is provided with a vent hole, and the vent hole is communicated with the second installation cavity.

9. The safety valve according to any one of claims 3 to 8, characterized in that: The safety valve further comprises a nut and an adjusting screw, wherein the nut is connected to one end of the valve cover away from the valve body, and the adjusting screw is threadedly connected to the nut and penetrates into the accommodating cavity to abut against the elastic component.

10. The safety valve according to claim 9, characterized in that: The elastic component includes a first spring seat, a second spring seat and a spring, the first spring seat, the second spring seat and the spring are respectively arranged in the accommodating cavity, and the spring is located between the first spring seat and the second spring seat, one end of the spring is connected to the first spring seat, and the other end of the spring is connected to the second spring seat, the valve core is in contact with the second spring seat, and the adjusting screw is in contact with the first spring seat.

11. The safety valve according to claim 9, characterized in that: The safety valve further comprises a dust cap, which is connected to an end of the valve cover away from the valve body and covers the nut and the adjusting screw.

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