Safety valve

Abstract

The utility model provides a safety valve which comprises a valve body provided with an oil filling port and a main cavity. The main elastic assembly is arranged in the main cavity, the first end of the main elastic assembly divides the main cavity into an oil injection cavity and an installation cavity which are independent of each other, the oil injection cavity communicates with the oil injection opening, the second end of the main elastic assembly is located in the installation cavity, and the auxiliary elastic assembly is arranged in the installation cavity and located at the end, away from the oil injection cavity, of the main elastic assembly; the first end of the auxiliary elastic assembly is connected with the second end of the main elastic assembly, the second end of the auxiliary elastic assembly is connected with the valve body, and the main elastic assembly and the auxiliary elastic assembly are used for applying acting force in the direction close to the oil filling port. The auxiliary elastic assembly does not bear the oil load; when the safety valve is in the second working state, the main elastic assembly and the auxiliary elastic assembly jointly bear the oil load. The safety valve is large in pressure bearing range and high in adaptability.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety valve. Background Art

[0002] During coal mining, hydraulic supports are needed to support the tunnels. The mine pressure of the fully mechanized mining face acts on the hydraulic supports in the form of external loads. In the prior art, hydraulic supports are usually used in conjunction with safety valves. When the load on the working cylinder of the hydraulic support exceeds the specified load, the cylinder of the hydraulic support is depressurized through the safety valve to ensure the normal operation of the support operation.

[0003] With the mining of coal mines, hydraulic supports are used to control the mine pressure of the coal mining face. The mine pressure of the mining face acts on the hydraulic supports in the form of external loads. If the combined force of the supporting parts of the hydraulic support and the combined force of the external load acting on the hydraulic support by the roof are exactly in the same line, the hydraulic support is very adaptable to the surrounding rock of the mining face. The safety valve is a necessary safety assurance component for the hydraulic support. It can make the working cylinder of the hydraulic support quickly discharge fluid when it is subjected to a load exceeding the specified value to ensure the safety of people and machines.

[0004] The safety valve usually includes a valve body seal and a spring. The valve body is provided with an oil filling port and a total chamber that are interconnected. The seal is movably arranged in the total chamber. The seal divides the total chamber into an independent oil filling chamber and an installation chamber. The oil filling port and the oil filling chamber are interconnected. The spring is arranged in the installation chamber. The hydraulic cylinder fills oil into the oil filling chamber through the oil filling port to achieve pressure relief operation, and resets through the spring.

[0005] In the existing hydraulic support safety valve, when the hydraulic support cylinder is subjected to a force exceeding the pressure set by the spring, the spring is compressed under the action of the oil pressure to achieve pressure relief, and the safety valve is reset by a spring component. However, the pressure range of a single spring is small, and the operating pressure range of the safety valve is small, so the use of the safety valve is limited. Utility Model Content

[0006] The utility model provides a safety valve to solve the problem that the safety valve in the prior art is provided with a spring, the pressure-bearing range of the spring is small, and the use of the safety valve is limited.

[0007] The utility model provides a safety valve, which comprises: a valve body, which has an oil filling port and a total chamber; a main elastic component, which is arranged in the total chamber, wherein the first end of the main elastic component moves relatively with the valve body and seals and cooperates, wherein the first end of the main elastic component divides the total chamber into an oil filling chamber and an installation chamber which are independent of each other, wherein the oil filling chamber is communicated with the oil filling port, wherein the second end of the main elastic component is located in the installation chamber, and wherein the main elastic component is used to apply an action force in a direction close to the oil filling port; an auxiliary elastic component, which is arranged in the installation chamber, wherein the auxiliary elastic component is located at an end of the main elastic component away from the oil filling chamber, wherein the first end of the auxiliary elastic component is connected to the second end of the main elastic component, wherein the second end of the auxiliary elastic component is connected to the valve body, and wherein the auxiliary elastic component is used to apply an action force in a direction close to the oil filling port to the main elastic component, wherein the working load of the auxiliary elastic component is less than the working load of the main elastic component; wherein the safety valve has a first working state and a second working state which are arranged relatively, wherein when the safety valve is in the first working state, the main elastic component bears the oil load, and the auxiliary elastic component does not bear the oil load; and when the safety valve is in the second working state, the main elastic component and the auxiliary elastic component bear the oil load together.

[0008] Furthermore, the safety valve further comprises: a sensing part, which is arranged in the installation cavity, and the sensing part is used to detect the force exerted on the auxiliary elastic component and / or the main elastic component.

[0009] Furthermore, the auxiliary elastic component includes: an auxiliary elastic part, one end of the auxiliary elastic part away from the main elastic component is connected to the valve body; a stop part, which is arranged between the auxiliary elastic part and the main elastic component, and the stop part has a relatively arranged stop state and an avoidance state. When the stop part is in the stop state, the stop part is used to stop the first end of the auxiliary elastic part so that the safety valve is in the first working state; when the stop part is in the avoidance state, the auxiliary elastic part applies a force to the main elastic component toward the oil filling port so that the safety valve is in the second working state.

[0010] Furthermore, a threaded hole is provided on the side wall of the valve body, the threaded hole is connected to the installation cavity, and the stop part includes: a stop screw, one end of the stop screw is passed through the threaded hole in the installation cavity, and the stop screw is used to stop the first end of the auxiliary elastic part.

[0011] Furthermore, the safety valve further comprises: a first sealing portion, which is used to seal the threaded hole when the stop screw is separated from the valve body.

[0012] Furthermore, a plurality of stop screws are provided, and the plurality of stop screws are distributed at intervals along the circumference of the valve body.

[0013] Furthermore, the auxiliary elastic part includes: an auxiliary connecting part, which is movably arranged at one end of the stop part away from the main elastic component; an auxiliary elastic member, which is arranged on a side of the auxiliary connecting part away from the stop part, one end of the auxiliary elastic member is connected to the auxiliary connecting part, and the other end of the auxiliary elastic member is connected to the valve body.

[0014] Further, the main elastic component includes: a first connecting part, which is movably arranged in the total chamber, and the first connecting part is sealed with the valve body; a main elastic member, one end of which is connected to the first connecting part; and a second connecting part, which is movably arranged at one end of the main elastic member away from the first connecting part, and the second connecting part is guided with the valve body.

[0015] Furthermore, the valve body comprises: a valve housing having a first mounting port and a main chamber connected to each other; a second sealing portion arranged at the first mounting port, and an oil filling port arranged on the second sealing portion.

[0016] Furthermore, a guide hole is provided on the second sealing portion, and the safety valve further comprises: a guide rod, one end of which extends into the oil filling cavity through the guide hole and is connected to the first end of the main elastic component, and the guide rod is guided and matched with the guide hole.

[0017] By applying the technical solution of the utility model, an auxiliary elastic component is set so that the safety valve has a first working state and a second working state that are relatively set. When the oil pressure of the oil cylinder is within a preset range, only the main elastic component needs to operate to achieve the pressure relief operation; when the oil pressure of the oil cylinder exceeds the preset range and the main elastic component alone cannot achieve the pressure relief operation, the auxiliary elastic component and the main elastic component operate at the same time to achieve the pressure relief operation. Such a setting can enable the safety valve to have two working states, a large pressure range of use, and improve the adaptability of the safety valve. In the traditional technical solution, the safety valve only includes one spring, and the pressure-bearing range of a single spring is small, and the pressure range of use is small, so that the use of the safety valve of the existing solution is limited. Compared with the traditional technical solution, the setting of this solution can expand the use pressure range of the safety valve and improve the adaptability of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 A schematic diagram showing the structure of the safety valve provided by the embodiment of the utility model when it is in a first working state;

[0020] Figure 2 A cross-sectional view of the safety valve provided by the embodiment of the utility model when it is in a first working state is shown;

[0021] Figure 3 A cross-sectional view of the safety valve provided by the embodiment of the utility model when in the second working state is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Valve body;

[0024] 101, oil filling cavity; 102, installation cavity;

[0025] 11. Valve housing;

[0026] 12. Second sealing part;

[0027] 13. End cap;

[0028] 20. Main elastic component;

[0029] 21. a first connecting portion;

[0030] 22. Main elastic member;

[0031] 23. A second connecting portion;

[0032] 24. First guide block; 25. Second guide block;

[0033] 30. Auxiliary elastic components;

[0034] 31. Auxiliary elastic part;

[0035] 311. Auxiliary connecting portion; 312. Auxiliary elastic member;

[0036] 32. Stopper;

[0037] 40. Sensing unit;

[0038] 50. a first sealing portion;

[0039] 60. Guide rod. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] like Figures 1 to 3As shown, an embodiment of the utility model provides a safety valve, which includes a valve body 10, a main elastic component 20 and an auxiliary elastic component 30. The valve body 10 has an oil filling port and a total chamber. The main elastic component 20 is arranged in the total chamber, and the first end of the main elastic component 20 moves relative to the valve body 10 and seals and cooperates. The first end of the main elastic component 20 divides the total chamber into an oil filling chamber 101 and an installation chamber 102 that are independent of each other. The oil filling chamber 101 is connected to the oil filling port, and the second end of the main elastic component 20 is located in the installation chamber 102. The main elastic component 20 is used to apply a force toward the direction close to the oil filling port. The auxiliary elastic component 30 is arranged in the installation cavity 102, and is located at one end of the main elastic component 20 away from the oil injection cavity 101. The first end of the auxiliary elastic component 30 is connected to the second end of the main elastic component 20, and the second end of the auxiliary elastic component 30 is connected to the valve body 10. The auxiliary elastic component 30 is used to apply a force toward the direction close to the oil injection port to the main elastic component 20, and the working load of the auxiliary elastic component 30 is less than the working load of the main elastic component 20. Among them, the safety valve has a first working state and a second working state that are relatively arranged. When the safety valve is in the first working state, the main elastic component 20 bears the oil load, and the auxiliary elastic component 30 does not bear the oil load; when the safety valve is in the second working state, the main elastic component 20 and the auxiliary elastic component 30 jointly bear the oil load.

[0042] By applying the technical solution of the utility model, by setting the auxiliary elastic component 30, the safety valve has a first working state and a second working state that are relatively set. When the oil pressure of the oil cylinder is within the preset range, only the main elastic component 20 needs to operate to achieve the pressure relief operation; when the oil pressure of the oil cylinder exceeds the preset range and the pressure relief operation cannot be achieved by the main elastic component 20 alone, the auxiliary elastic component 30 and the main elastic component 20 operate at the same time to achieve the pressure relief operation. Such a setting can make the safety valve have two working states, the pressure range of use is large, and the adaptability of the safety valve is improved. In the traditional technical solution, the safety valve only includes one spring, and the pressure bearing range of a single spring is small, and the pressure range of use is small, so that the use of the safety valve of the existing solution is limited. Compared with the traditional technical solution, the setting of this solution can expand the use pressure range of the safety valve and improve the adaptability of the safety valve.

[0043] Furthermore, the safety valve further includes a sensor portion 40 , which is disposed in the mounting cavity 102 , and is used to detect the force acting on the auxiliary elastic component 30 and / or the main elastic component 20 .

[0044] In the embodiment of the present solution, the sensing part 40 is arranged in the installation cavity and is located below the auxiliary elastic component 30. With such arrangement, when the safety valve is in the second working state, the sensing part 40 can detect the force exerted by the auxiliary elastic component 30 and the main elastic component 20. The arrangement of the sensing part 40 can facilitate the staff to timely judge the force exerted on the auxiliary elastic component 30 and the main elastic component 20, so that the staff can make timely adjustments to the situation on site.

[0045] In some embodiments of the present solution, the sensing portion 40 can also independently detect the force exerted on the main elastic component 20 .

[0046] In some embodiments of the present solution, the sensing portion 40 can also independently detect the force exerted on the auxiliary elastic component 30 .

[0047] Specifically, the auxiliary elastic component 30 includes an auxiliary elastic portion 31 and a stopper 32. Among them, one end of the auxiliary elastic portion 31 away from the main elastic component 20 is connected to the valve body 10. The stopper 32 is arranged between the auxiliary elastic portion 31 and the main elastic component 20, and the stopper 32 has a relatively arranged stopper state and an avoidance state. When the stopper 32 is in the stopper state, the stopper 32 is used to stop the first end of the auxiliary elastic portion 31, so that the safety valve is in the first working state; when the stopper 32 is in the avoidance state, the auxiliary elastic portion 31 applies a force toward the oil filling port to the main elastic component 20, so that the safety valve is in the second working state. Such arrangement enables the auxiliary elastic portion 31 to have two working states. When the stop portion 32 is in the stopping state, the auxiliary elastic portion 31 does not need to apply a force to the main elastic component 20, that is, the auxiliary elastic component 30 does not participate in the pressure relief operation; when the stop portion 32 is in the avoiding state, the auxiliary elastic portion 31 applies a force to the main elastic component 20, that is, the auxiliary elastic component 30 participates in the pressure relief operation.

[0048] In the embodiment of the present solution, a threaded hole is provided on the side wall of the valve body 10, the threaded hole is communicated with the installation cavity 102, the stopper 32 includes a stopper screw, one end of the stopper screw is passed through the threaded hole and is arranged in the installation cavity 102, and the stopper screw is used to stop the first end of the auxiliary elastic part 31. The setting of the stopper screw has a simple structure, and the stopper screw and the threaded hole have a self-locking function, which can ensure the stopping effect on the auxiliary elastic part 31.

[0049] Furthermore, the safety valve further includes a first sealing portion 50, which is used to seal the threaded hole when the stop screw is separated from the valve body 10. The provision of the first sealing portion 50 can prevent debris from falling into the installation cavity 102, thereby preventing debris from entering the oil filling cavity 101, and preventing debris from flowing back into the oil cylinder along with the oil, thereby improving the smoothness of the operation of the oil cylinder.

[0050] This solution does not limit the number of stop screws.

[0051] In the embodiment of this solution, a plurality of stop screws are provided, and the plurality of stop screws are spaced apart along the circumference of the valve body 10. Such an arrangement can improve the stopping effect of the stop screws.

[0052] Specifically, the auxiliary elastic part 31 includes an auxiliary connecting part 311 and an auxiliary elastic member 312. The auxiliary connecting part 311 is movably arranged at one end of the stopper part 32 away from the main elastic component 20. The auxiliary elastic member 312 is arranged on one side of the auxiliary connecting part 311 away from the stopper part 32, one end of the auxiliary elastic member 312 is connected to the auxiliary connecting part 311, and the other end of the auxiliary elastic member 312 is connected to the valve body 10. Such an arrangement can improve the stability of the auxiliary connecting part 311 in contact with the stopper screw and improve the stability of the stopper screw in stopping.

[0053] This solution does not limit the number of auxiliary elastic members 312 .

[0054] In some embodiments of the present solution, one auxiliary elastic member 312 is provided.

[0055] In the embodiment of this solution, the auxiliary elastic member 312 includes an auxiliary spring, and two auxiliary springs are provided.

[0056] Furthermore, the auxiliary connecting portion 311 is guided and matched with the valve body 10. Such an arrangement can improve the smoothness and stability of the auxiliary elastic member 312 during its expansion and contraction.

[0057] In the embodiment of the present solution, the main elastic component 20 includes a first connection portion 21, a main elastic member 22, and a second connection portion 23. The first connection portion 21 is movably arranged in the general chamber, and the first connection portion 21 is sealed with the valve body 10. One end of the main elastic member 22 is connected to the first connection portion 21. The second connection portion 23 is movably arranged at one end of the main elastic member 22 away from the first connection portion 21, and the second connection portion 23 is guided with the valve body 10. Such a configuration has a simple structure and can ensure the stability of the main elastic member 22 during the expansion and contraction process.

[0058] Furthermore, the main elastic member 22 includes a main spring. The safety valve also includes a first guide block 24 and a second guide block 25. The first guide block 24 is arranged on a side of the first connection portion 21 close to the main spring, and the first guide block 24 extends into one end of the main spring close to the first connection portion 21. The second guide block 25 is arranged on a side of the second connection portion 23 close to the main spring, and the second guide block 25 extends into one end of the main spring close to the second connection portion 23. The arrangement of the first guide block 24 and the second guide block 25 can guide the expansion and contraction of the main spring, further improving the smoothness and stability of the expansion and contraction process of the main spring.

[0059] In the embodiment of the present solution, the valve body 10 includes a valve housing 11 and a second sealing portion 12, the valve housing 11 has a first mounting port and a general chamber connected to each other; the second sealing portion 12 is arranged at the first mounting port, and the oil filling port is arranged on the second sealing portion 12. The valve housing 11 also has a second mounting port, and the second mounting port and the first mounting port are respectively connected to the two ends of the general chamber. The valve body 10 also includes an end cover 13, the end cover 13 is arranged at the second mounting port, and the sensor 40 is arranged on the end cover 13. Such an arrangement facilitates the assembly of the safety valve.

[0060] Furthermore, a guide hole is provided on the second sealing portion 12, and the safety valve further includes a guide rod 60, one end of which extends into the oil injection cavity 101 through the guide hole and is connected to the first end of the main elastic component 20, and the guide rod 60 is guided and matched with the guide hole. The provision of the guide rod 60 can guide the expansion and contraction of the main elastic component 20, further improving the stability and smoothness of the expansion and contraction process of the main elastic component 20.

[0061] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0062] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps described in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0063] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each part itself.

[0064] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0065] In addition, it should be noted that the use of terms such as "first" and "second" to limit parts is only to facilitate the distinction between corresponding parts. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present utility model.

[0066] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A safety valve, characterized in that: The safety valve comprises: A valve body (10) having an oil filling port and a main chamber; A main elastic component (20) is arranged in the general chamber, the first end of the main elastic component (20) moves relative to the valve body (10) and is in sealing cooperation, the first end of the main elastic component (20) divides the general chamber into an oil injection chamber (101) and an installation chamber (102) which are independent of each other, the oil injection chamber (101) is communicated with the oil injection port, the second end of the main elastic component (20) is located in the installation chamber (102), and the main elastic component (20) is used to apply a force in a direction close to the oil injection port; an auxiliary elastic component (30) arranged in the installation cavity (102), the auxiliary elastic component (30) being located at an end of the main elastic component (20) away from the oil injection cavity (101), the first end of the auxiliary elastic component (30) being connected to the second end of the main elastic component (20), the second end of the auxiliary elastic component (30) being connected to the valve body (10), the auxiliary elastic component (30) being used to apply a force to the main elastic component (20) in a direction close to the oil injection port, and the working load of the auxiliary elastic component (30) being smaller than the working load of the main elastic component (20); The safety valve has a first working state and a second working state which are arranged relatively to each other. When the safety valve is in the first working state, the main elastic component (20) bears the oil load, and the auxiliary elastic component (30) does not bear the oil load; when the safety valve is in the second working state, the main elastic component (20) and the auxiliary elastic component (30) bear the oil load together.

2. The safety valve according to claim 1, characterized in that: The safety valve further comprises: A sensing portion (40) is disposed in the installation cavity (102), and the sensing portion (40) is used to detect the force applied to the auxiliary elastic component (30) and / or the main elastic component (20).

3. The safety valve according to claim 1, characterized in that: The auxiliary elastic component (30) comprises: an auxiliary elastic portion (31), wherein one end of the auxiliary elastic portion (31) away from the main elastic component (20) is connected to the valve body (10); A stopper (32) is arranged between the auxiliary elastic part (31) and the main elastic component (20), and the stopper (32) has a stopper state and an avoidance state which are arranged relatively to each other. When the stopper (32) is in the stopper state, the stopper (32) is used to stop the first end of the auxiliary elastic part (31), so that the safety valve is in the first working state; when the stopper (32) is in the avoidance state, the auxiliary elastic part (31) applies a force to the main elastic component (20) toward the oil filling port, so that the safety valve is in the second working state.

4. The safety valve according to claim 3, characterized in that: A threaded hole is provided on the side wall of the valve body (10), the threaded hole is communicated with the installation cavity (102), and the stopper (32) comprises: A stop screw, one end of which is inserted into the installation cavity (102) through the threaded hole, and the stop screw is used to stop the first end of the auxiliary elastic part (31).

5. The safety valve according to claim 4, characterized in that: The safety valve further comprises: A first sealing portion (50), which is used to seal the threaded hole when the stop screw is separated from the valve body (10).

6. The safety valve according to claim 4, characterized in that: A plurality of the stop screws are provided, and the plurality of the stop screws are distributed at intervals along the circumference of the valve body (10).

7. The safety valve according to claim 3, characterized in that: The auxiliary elastic portion (31) comprises: An auxiliary connecting portion (311) is movably arranged at an end of the stopper portion (32) away from the main elastic component (20); An auxiliary elastic member (312) is arranged on a side of the auxiliary connecting portion (311) away from the stop portion (32), one end of the auxiliary elastic member (312) is connected to the auxiliary connecting portion (311), and the other end of the auxiliary elastic member (312) is connected to the valve body (10).

8. The safety valve according to claim 3, characterized in that: The main elastic component (20) comprises: A first connecting portion (21) is movably disposed in the main chamber, the first connecting portion (21) being in sealing cooperation with the valve body (10); A main elastic member (22), one end of the main elastic member (22) being connected to the first connecting portion (21); The second connecting portion (23) is movably arranged at an end of the main elastic member (22) away from the first connecting portion (21), and the second connecting portion (23) is guided and matched with the valve body (10).

9. The safety valve according to claim 1, characterized in that: The valve body (10) comprises: A valve housing (11), the valve housing (11) having a first mounting port and the main chamber connected to each other; The second sealing portion (12) is arranged at the first installation opening, and the oil filling port is arranged on the second sealing portion (12).

10. The safety valve according to claim 9, characterized in that: The second sealing portion (12) is provided with a guide hole, and the safety valve further comprises: A guide rod (60), one end of which extends into the oil injection cavity (101) through the guide hole and is connected to the first end of the main elastic component (20), and the guide rod (60) is in guiding cooperation with the guide hole.

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