Low-temperature spring micro-lift safety valve

Abstract

The utility model discloses a low-temperature spring micro-lift safety valve which comprises a valve body. The valve seat is arranged in the inner cavity of the valve body and matched with the inner wall of the valve body; the valve cover is matched with the upper end of the valve body; the valve rod is arranged in an inner cavity of the valve cover, the valve clack is arranged above the valve body, and at least two counter bores are symmetrically formed in the side wall of the valve clack; the recoil disc is arranged on the valve clack, the lower end of the recoil disc is matched with the upper end of the valve clack, and the upper end of the recoil disc is matched with the lower end of the valve rod; the spring pin is arranged in the counter bore and the through hole to connect the valve clack and the recoil disc, the spring pin is in clearance fit with the valve clack, so that the valve clack and the spring pin form a clearance floating type structure, and the problems that a traditional safety valve is prone to clamping stagnation and untight sealing in a low-temperature environment are solved. And the service life of the safety valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a low-temperature spring micro-opening safety valve. Background Art

[0002] Safety valves are special valves 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 exceeds 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. Safety valves belong to the automatic valve category and are mainly used in boilers, pressure vessels and pipelines to control the pressure not to exceed the specified value, playing an important protective role in personal safety and equipment operation.

[0003] When designing and manufacturing the safety valve in the prior art, the performance under normal or high temperature environment is mainly considered. However, under low temperature environment, due to factors such as material shrinkage and reduced lubrication performance, problems such as sticking and poor sealing between the valve disc and the valve seat are prone to occur, affecting the normal operation of the safety valve. Utility Model Content

[0004] The purpose of the utility model is to provide a low-temperature spring micro-opening safety valve, aiming to solve the problem that the safety valve in the prior art is prone to sticking and poor sealing between the valve disc and the valve seat in a low-temperature environment due to factors such as material shrinkage and reduced lubrication performance.

[0005] In order to achieve the above object, the utility model is implemented through the following technical solutions:

[0006] A low-temperature spring micro-opening safety valve, comprising:

[0007] Valve body;

[0008] A valve seat, which is arranged in the inner cavity of the valve body and cooperates with the inner wall of the valve body;

[0009] a valve cover, which cooperates with the upper end of the valve body;

[0010] A valve stem is arranged in the inner cavity of the valve cover, a spring is sleeved on the outer side of the valve stem, and the lower end of the valve stem is located in the valve body.

[0011] A valve flap, which is arranged above the valve body, and the side wall of the valve flap has at least two countersunk holes symmetrically formed therein;

[0012] A recoil disc, which is arranged on the valve disc, the lower end of the recoil disc cooperates with the upper end of the valve disc, the upper end of the recoil disc cooperates with the lower end of the valve stem, the side wall of the recoil disc is symmetrically provided with at least two through holes, the positions of the through holes and the countersunk holes correspond one to one, and the recoil disc is used to guide or position the valve disc;

[0013] A spring pin is disposed in the counterbore and the through hole to connect the valve flap and the recoil disk.

[0014] Preferably, the diameter of each of the countersunk holes is larger than the diameter of each of the corresponding through holes, and one end of the spring pin and the valve flap are clearance-matched in the countersunk holes.

[0015] Preferably, it further comprises: a guide sleeve, which is arranged in the inner cavity of the valve body, and the lower end of the guide sleeve is sleeved on the outer side wall of the recoil disk, which is used for guiding the recoil disk and controlling the maximum displacement of the valve disc.

[0016] Preferably, the guide sleeve is arranged at the connection between the valve body and the valve cover, and the upper end of the guide sleeve is matched with the valve body and the valve cover respectively.

[0017] Preferably, two spring seats are arranged at intervals along the outer side wall of the valve stem, and the spring is arranged between the two spring seats.

[0018] Preferably, both ends of the spring are fixedly connected to the spring seat.

[0019] Preferably, it further comprises: an adjusting ring, which is sleeved on the top of the valve seat, and the set pressure of the safety valve is adjusted by adjusting the position of the adjusting ring.

[0020] Preferably, a thread is provided on the outer side of the upper end of the valve seat, and the adjustment ring is threadedly connected to the valve seat.

[0021] Preferably, it further comprises: a valve bonnet and a handle, wherein the valve bonnet cooperates with the top of the valve cover, and the handle is connected to the top of the valve stem and is used to adjust the position of the valve stem to control the pressure of the spring.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The low-temperature spring micro-opening safety valve provided by the utility model connects the valve disc and the recoil disk by arranging a spring pin, and arranges a clearance fit between the spring pin and the valve disc, so that the valve disc and the spring pin form a clearance floating structure, thereby solving the problems of sticking and poor sealing that are prone to occur in traditional safety valves under low-temperature environments, and improving the reliability and service life of the safety valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solution of the utility model, the following is a brief introduction to the drawings required for the description. Obviously, the drawings in the following description are three embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0025] Figure 1 A schematic diagram of the structure of a low-temperature spring micro-opening safety valve provided in one embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the valve flap and recoil disc structure provided in one embodiment of the utility model;

[0027] Figure 3 A schematic diagram of the three-dimensional structure of a low-temperature spring micro-opening safety valve provided in one embodiment of the utility model.

[0028] Explanation of the reference numerals: 1-valve body, 2-valve seat, 3-adjusting ring, 4-valve disc, 5-recoil disc, 6-guide sleeve, 7-valve cover, 8-spring seat, 9-spring, 10-valve stem, 11-valve bonnet, 12-spring pin, 13-handle. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-3 The low-temperature spring micro-opening safety valve proposed in the utility model is further described in detail with specific implementation methods. According to the following description, the advantages and features of the utility model will be clearer. It should be noted that the drawings are in a very simplified form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the implementation method of the utility model. In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, please refer to the drawings. It should be noted that the structure, proportion, size, etc. illustrated in the drawings in this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so it has no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that the utility model can produce and the purpose that can be achieved, should still fall within the scope of the technical content disclosed by the utility model.

[0030] In view of the fact that the safety valve in the prior art is in a low temperature environment, it is easy to get stuck and the sealing between the valve disc and the valve seat is not tight due to factors such as material shrinkage and reduction of lubrication performance.

[0031] refer to Figure 1As shown, this embodiment provides a low-temperature spring micro-opening safety valve, comprising: a valve body 1; a valve seat 2, which is arranged in the inner cavity of the valve body 1 and cooperates with the inner wall of the valve body 1; a valve cover 7, which cooperates with the upper end of the valve body 1; a valve stem 10, which is arranged in the inner cavity of the valve cover 7, a spring 9 is sleeved on the outer side of the valve stem 10, and the lower end of the valve stem 10 is located in the valve body 1; a valve flap 4, which is arranged above the valve body 1, and the side wall of the valve flap 4 is symmetrically opened with at least two a countersunk hole; a recoil disk 5, which is arranged on the valve disc 4, the lower end of the recoil disk 5 cooperates with the upper end of the valve disc 4, the upper end of the recoil disk 5 cooperates with the lower end of the valve stem 10, the side wall of the recoil disk 5 is symmetrically provided with at least two through holes, the positions of the through holes and the countersunk holes correspond one to one, and the recoil disk 5 is used to guide or position the valve disc 4; a spring pin 12, which is arranged in the countersunk hole and the through hole to connect the valve disc 4 and the recoil disk 5.

[0032] refer to Figure 2 As shown, the diameter of each counterbore is larger than the diameter of each corresponding through hole, and one end of the spring pin 12 is clearance-matched with the valve disc 4 in the counterbore. According to the thermal expansion coefficients of the materials of the valve disc 4, the spring pin 12, and the valve seat 2 at different temperatures, the clearance between the spring pin 12 and the valve disc 4 is determined. A clearance is provided between the spring pin 12 and the valve disc 4 and the recoil disc 5, and the clearance can allow the valve disc 4 to slightly float under the action of the spring pin 12 in a low temperature environment, thereby avoiding the problems of stagnation and poor sealing. Specifically: one end of the spring pin 12 is fixedly connected to the valve disc 4, and the other end is connected to the recoil disc 5. Under the clearance-matching action of the spring pin 12, the valve disc 4 can float within a certain range to adapt to the shrinkage of the material and the change of lubrication performance in the low temperature environment. At the same time, the clearance design between the spring pin 12 and the valve disc 4 and the recoil disc 5 also takes into account the thermal expansion coefficient of the material at low temperatures, ensuring the normal operation of the safety valve in a low temperature environment.

[0033] The low temperature spring micro-opening safety valve provided in this embodiment further includes: a guide sleeve 6, which is arranged in the inner cavity of the valve body 1, and the lower end of the guide sleeve 6 is sleeved on the outer side wall of the recoil disc 5, which is used to guide the recoil disc 5 and control the maximum displacement of the valve disc 4. The guide sleeve 6 is arranged at the connection between the valve body 1 and the valve cover 7, and the upper end of the guide sleeve 6 is matched with the valve body 1 and the valve cover 7 respectively.

[0034] Two spring seats 8 are arranged at intervals along the outer side wall of the valve stem 10, and the spring 9 is arranged between the two spring seats 8. Both ends of the spring 9 are fixedly connected to the spring seats 8.

[0035] The low-temperature spring micro-opening safety valve provided in this embodiment further includes: an adjusting ring 3, which is sleeved on the top of the valve seat 2, and the set pressure of the safety valve is adjusted by adjusting the position of the adjusting ring 3. The outer side of the upper end of the valve seat 2 is provided with a thread, and the adjusting ring is threadedly connected to the valve seat 2.

[0036] refer to Figure 3 As shown, a low-temperature spring micro-opening safety valve provided in this embodiment also includes: a valve bonnet 11 and a handle 13, wherein the valve bonnet 11 cooperates with the top of the valve cover 7, and the handle 13 is connected to the top of the valve stem 10, and is used to adjust the position of the valve stem 10 to control the pressure of the spring 9.

[0037] During the manufacturing process, the valve body 1, valve disc 4, spring 9 and spring pin 12 are precisely processed and assembled to ensure the matching accuracy and sealing performance between the components. At the same time, the heat treatment process of the valve body 1, valve disc 4, spring 9 and spring pin 12 is optimized to improve their mechanical properties and sealing performance in low temperature environments.

[0038] When the pressure in the pressure vessel or pipeline system exceeds the set value, the valve flap 4 opens upward under the action of the pressure to overcome the elastic force of the spring 9, and the valve flap is disengaged from the valve seat, allowing the medium to flow out, thereby protecting the equipment from overpressure damage. When the pressure in the pressure vessel or pipeline system drops below the set value, the elastic force of the spring 9 closes the valve flap 4, and the valve flap fits against the valve seat to restore the sealing state. Due to the clearance design between the spring pin 12 and the recoil disc 5 and the valve flap 4, the valve flap 4 can still move flexibly in a low temperature environment, avoiding the problems of stagnation and poor sealing.

[0039] To sum up, the present embodiment provides a low-temperature spring micro-opening safety valve, which connects the valve disc and the recoil disk by setting a spring pin, and sets a clearance fit between the spring pin and the valve disc, so that the valve disc and the spring pin form a gap floating structure, which effectively solves the problems of sticking and poor sealing that are prone to occur in traditional safety valves under low-temperature environments, and improves the reliability and service life of the safety valve. The safety valve of the present embodiment is suitable for various pressure vessels and pipeline systems that need to work in low-temperature environments, such as petroleum, chemical, natural gas and other industries. It has the advantages of simple structure, easy use, high reliability and long service life, which makes the low-temperature spring micro-opening safety valve provided by the present embodiment have broad application prospects and important market value.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0041] In the description of the present invention, it should be understood that the terms "center", "height", "thickness", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] Although the content of the utility model has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as a limitation of the utility model. After reading the above content, various modifications and substitutions of the utility model will be obvious to those skilled in the art. Therefore, the protection scope of the utility model should be limited by the attached claims.

Claims

1. A low temperature spring micro-opening safety valve, characterized in that: include: Valve body; A valve seat, which is arranged in the inner cavity of the valve body and cooperates with the inner wall of the valve body; a valve cover, which cooperates with the upper end of the valve body; A valve stem is arranged in the inner cavity of the valve cover, a spring is sleeved on the outer side of the valve stem, and the lower end of the valve stem is located in the valve body. A valve flap, which is arranged above the valve body, and the side wall of the valve flap has at least two countersunk holes symmetrically formed therein; A recoil disc, which is arranged on the valve disc, the lower end of the recoil disc cooperates with the upper end of the valve disc, the upper end of the recoil disc cooperates with the lower end of the valve stem, and the side wall of the recoil disc is symmetrically provided with at least two through holes, and the positions of the through holes and the countersunk holes correspond one to one; A spring pin is disposed in the counterbore and the through hole to connect the valve flap and the recoil disk.

2. The low temperature spring micro-opening safety valve according to claim 1, characterized in that: The diameter of each of the countersunk holes is larger than the diameter of each of the corresponding through holes, and one end of the spring pin is clearance-matched with the valve flap in the countersunk hole.

3. The low temperature spring micro-opening safety valve according to claim 1, characterized in that: Also includes: A guide sleeve is arranged in the inner cavity of the valve body, and the lower end of the guide sleeve is sleeved on the outer side wall of the recoil disk, and is used for guiding the recoil disk and controlling the maximum displacement of the valve disc.

4. The low temperature spring micro-opening safety valve according to claim 3 is characterized in that: The guide sleeve is arranged at the connection between the valve body and the valve cover, and the upper end of the guide sleeve is matched with the valve body and the valve cover respectively.

5. The low temperature spring micro-opening safety valve according to claim 1, characterized in that: Two spring seats are arranged at intervals along the outer side wall of the valve stem, and the spring is arranged between the two spring seats.

6. The low temperature spring micro-opening safety valve according to claim 5, characterized in that: Two ends of the spring are fixedly connected to the spring seat.

7. The low temperature spring micro-opening safety valve according to claim 1, characterized in that: Also includes: An adjusting ring is sleeved on the top of the valve seat, and the set pressure of the safety valve is adjusted by adjusting the position of the adjusting ring.

8. The low temperature spring micro-opening safety valve according to claim 7, characterized in that: The outer side of the upper end of the valve seat is provided with a thread, and the adjusting ring is threadedly connected with the valve seat.

9. The low temperature spring micro-opening safety valve according to claim 1, characterized in that: It also includes: a valve bonnet and a handle, wherein the valve bonnet cooperates with the top of the valve cover, and the handle is connected to the top of the valve stem and is used to adjust the position of the valve stem to control the pressure of the spring.

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