Pressure regulating safety valve

Abstract

The utility model discloses a pressure regulating type safety valve relates to valve technical field, including valve bush, valve body, thimble, spring, spring seat and pressure regulating subassembly, valve bush is with valve body screw thread connection, and the top of valve body is equipped with through -hole, and thimble is with through -hole telescopic cooperation, pressure regulating subassembly contains pressure regulating screw, sealing sleeve and first sealing ring: pressure regulating screw is with valve bush internal thread connection, and one end is equipped with the locating pin and annular groove, sealing sleeve has the bottom ring of the locating pin and sleeve, and the bottom ring bottom is equipped with the annular step of rotating cooperation with annular groove, and the inner wall of valve bush is equipped with sealing ring groove, and first sealing ring is installed in the groove and with sleeve sliding seal. The safety valve is through the positioning cooperation of sealing sleeve and pressure regulating screw, the sliding seal of first sealing ring, forms double seal, avoids fluid seepage, and positioning column and annular step guarantee pressure regulating screw without deviation, ensure that spring stress is even, promote thimble sealing pressure control precision, solve the problem that the existing safety valve is sealed, and the pressure regulating is not accurate.

Description

Technical Field

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

[0002] In fluid transportation and pressure equipment fields, safety valves are key components that ensure system pressure stability and prevent overpressure damage. Their pressure regulation accuracy and sealing performance directly determine the safety and reliability of equipment operation. Currently, most commercially available pressure-regulating safety valves achieve pressure regulation through the combination of springs and pressure-regulating screws. The basic structure typically includes core components such as valve sleeves, valve bodies, ejector pins, and spring seats. By adjusting the compression of the spring through the pressure-regulating screw, the sealing pressure of the ejector pin through the valve body orifice is changed, thereby controlling the opening pressure threshold of the safety valve.

[0003] However, existing pressure-regulating safety valves have significant shortcomings in practical applications: On the one hand, the sealing structure design of the pressure regulating component is unreasonable. Most products rely solely on a single seal at the threaded connection between the pressure regulating screw and the valve sleeve, or use a simple sealing ring directly attached to the valve sleeve. After long-term pressure regulation operations cause relative sliding of the components, the seals are prone to wear and deformation, leading to fluid leakage from the thread gaps or sealing surfaces. This not only affects the pressure regulation accuracy but may also cause safety hazards such as media leakage. On the other hand, the positioning stability of the pressure regulating screw and the internal spring seat (or related components) of some products is poor. Positioning deviation is prone to occur during pressure regulation, resulting in uneven spring force, further reducing the pressure control accuracy of the safety valve. Moreover, after long-term use, the component clearance increases, and the failure rate rises significantly.

[0004] Therefore, in view of the shortcomings of existing pressure regulating safety valves in terms of sealing reliability and pressure regulation stability, there is an urgent need to design a pressure regulating safety valve with a more reasonable sealing structure and more accurate pressure regulation positioning, so as to solve the leakage problem and insufficient pressure regulation accuracy of existing products and meet the high performance and high reliability requirements of industrial equipment for safety valves. Utility Model Content

[0005] To address the shortcomings of the prior art, this utility model provides a pressure regulating safety valve.

[0006] The technical solution adopted by this utility model is: a pressure regulating safety valve, including a valve sleeve, a valve body, a pin, a spring, a spring seat and a pressure regulating component. The valve sleeve is threadedly connected to the valve body. The top of the valve body is provided with a through hole communicating with the valve body. The pin is fitted into the valve body and the top of the pin is in telescopic cooperation with the through hole. The pressure regulating component includes a pressure regulating screw, a sealing sleeve and a first sealing ring. The pressure adjusting screw is threaded to the internal thread on the valve sleeve at the end away from the ejector pin. One end of the pressure adjusting screw is provided with a positioning post, and a ring groove is provided on the end face of the pressure adjusting screw located on one side of the positioning post. The sealing sleeve includes a bottom ring fitted onto the positioning post and a sleeve connected to the bottom ring. The bottom of the bottom ring is provided with an annular step that rotatably engages with the annular groove. At least one sealing ring groove is provided on the inner wall of the valve sleeve above the internal thread, and the first sealing ring is installed in the sealing ring groove and slides and seals with the sleeve.

[0007] Furthermore, a tool removal hole is provided on the end face of the pressure adjusting screw away from the positioning post.

[0008] Furthermore, one end of the spring is connected to the spring seat, and the other end is connected to the positioning post.

[0009] Furthermore, the ejector pin is provided with a medium inlet, and multiple rows of first outlets are provided at intervals on the outer wall of the ejector pin, and at least two rings of second outlets are provided at intervals on the valve sleeve.

[0010] Furthermore, a second sealing ring is provided on the inner wall of the through hole.

[0011] Furthermore, the spring seat is provided with a positioning concave surface that matches the top of the ejector pin.

[0012] Furthermore, the cross-section of the annular groove and the annular step is a dovetail structure.

[0013] The beneficial effects of this utility model are: 1. Improve sealing reliability: In the pressure regulating assembly, the bottom ring of the sealing sleeve rotates and engages with the annular groove of the pressure regulating screw through an annular step. At the same time, the first sealing ring on the inner wall of the valve sleeve slides and seals with the sealing sleeve sleeve, effectively preventing fluid leakage from the thread gap or mating surface between the pressure regulating screw and the valve sleeve, thus improving sealing reliability.

[0014] 2. Ensure accurate pressure regulation: The positioning pin of the pressure regulating screw is precisely fitted with the bottom ring of the sealing sleeve, providing stable positioning for the pressure regulating screw, avoiding positioning deviation during pressure regulation, ensuring uniform force on the spring, and thus ensuring accurate control of the sealing pressure of the top pin in the valve body through hole, improving the adjustment accuracy of the safety valve opening pressure threshold.

[0015] In addition to the objectives, features and advantages described above, this utility model has other objectives, features and advantages.

[0016] The present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 A schematic diagram of the valve body and ejector pin. Figure 1-2 In the middle section: 1. Valve sleeve; 2. Valve body; 3. Ejector pin; 4. Spring; 5. Spring seat; 6. Through hole; 7. Adjusting screw; 8. Sealing sleeve; 9. First sealing ring; 10. Internal thread; 11. Positioning pin; 12. Annular groove; 13. Bottom ring; 14. Sleeve; 15. Annular step; 16. Sealing ring groove; 17. Tool removal hole; 18. Medium inlet; 19. First outlet; 20. Second outlet; 21. Second sealing ring; 22. Positioning concave surface. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] This utility model provides a pressure regulating safety valve.

[0022] In this embodiment, refer to Figure 1-2 The pressure regulating safety valve includes a valve sleeve 1, a valve body 2, a pin 3, a spring 4, a spring seat 5, and a pressure regulating assembly. The valve sleeve is threadedly connected to the valve body. The top of the valve body is provided with a through hole 6 that communicates with the valve body. The pin is fitted into the valve body, and the top of the pin is in telescopic cooperation with the through hole. The pressure regulating assembly includes a pressure regulating screw 7, a sealing sleeve 8, and a first sealing ring 9. The pressure adjusting screw is threaded to the internal thread 10 on the valve sleeve at the end away from the ejector pin. One end of the pressure adjusting screw is provided with a positioning post 11, and a ring groove 12 is provided on the end face of the pressure adjusting screw located on one side of the positioning post 11. The sealing sleeve includes a bottom ring 13 fitted onto the positioning post 11 and a sleeve 14 connected to the bottom ring. The bottom of the bottom ring is provided with an annular step 15 that rotatably engages with the annular groove. At least one sealing ring groove 16 is provided on the inner wall of the valve sleeve above the internal thread, and the first sealing ring is installed in the sealing ring groove and slides and seals with the sleeve.

[0023] In the above technical solution, the pressure adjusting screw is connected to the valve sleeve via an internal thread. Its positioning post provides a fitting reference for the bottom ring of the sealing sleeve. The annular step of the bottom ring and the annular groove of the pressure adjusting screw rotate to achieve precise positioning and relative rotation between the two. At the same time, the first sealing ring in the sealing ring groove on the inner wall of the valve sleeve slides and seals with the sealing sleeve, improving sealing reliability. The cooperation between the positioning post and the annular step ensures that the pressure adjusting screw does not deviate during adjustment, ensuring uniform force on the spring, thereby improving the control accuracy of the top pin sealing pressure in the through hole, making the adjustment of the safety valve opening pressure threshold more precise, and laying the foundation for structural optimization in subsequent claims.

[0024] Specifically, a tool removal hole 17 is provided on the end face of the pressure adjusting screw away from the positioning post.

[0025] In this embodiment, a tool removal hole is provided on the end face of the pressure adjusting screw away from the positioning post. This hole is compatible with conventional removal tools such as wrenches and screwdrivers, providing a force application point for the tools. This allows the installation, removal, and pressure adjustment of the pressure adjusting screw to be completed with the help of tools, replacing manual operation or non-standard tool compatibility when there is no tool hole.

[0026] Specifically, one end of the spring is connected to the spring seat, and the other end is connected to the positioning post.

[0027] In this embodiment, the two ends of the spring are connected to the spring seat and the positioning post respectively, forming a force transmission path of "positioning post-spring-spring seat": when the pressure adjusting screw rotates, the positioning post moves axially with it, directly compressing or releasing the spring. The spring force is transmitted to the ejector pin through the spring seat, so that the ejector pin obtains a stable axial force, thereby adjusting the sealing pressure of the ejector pin on the valve body through hole.

[0028] Specifically, the ejector pin is provided with a medium inlet 18, and multiple rows of first outlets 19 are provided at intervals on the outer wall of the ejector pin, and at least two rings of second outlets 20 are provided at intervals on the valve sleeve.

[0029] In this embodiment, a medium inlet is provided on the ejector pin, and multiple rows of first outlets are provided at intervals on the outer wall. At least two rings of second outlets are provided on the valve sleeve. When the system pressure exceeds the limit, the medium enters from the ejector pin inlet, pushes the ejector pin to move and open the through hole, and the medium flows out through the first outlet of the ejector pin and is discharged through the second outlet of the valve sleeve. The multiple rows of first outlets and the multiple rings of second outlets form a "multi-stage flow guide" channel, which expands the medium flow path and flow area.

[0030] Specifically, a second sealing ring 21 is provided on the inner wall of the through hole.

[0031] In this embodiment, a second sealing ring is provided on the inner wall of the valve body through hole. When the top of the ejector pin is in telescopic cooperation with the through hole, the outer wall of the ejector pin is tightly fitted with the second sealing ring, forming an additional sealing layer between the ejector pin and the through hole.

[0032] Specifically, the spring seat is provided with a positioning concave surface 22 that is adapted to the top of the ejector pin.

[0033] In this embodiment, a positioning concave surface adapted to the top of the ejector pin is provided on the spring seat. The top of the ejector pin can be embedded in the concave surface, so that the support of the ejector pin by the spring seat changes from "planar contact" to "concave positioning contact". The concave surface provides radial limit for the top of the ejector pin, limiting the radial displacement of the ejector pin during axial movement.

[0034] Specifically, the cross-sections of the annular groove and the annular step are dovetail structures.

[0035] In this embodiment, the cross-sections of the annular groove and the annular step are designed as dovetail structures. The "narrow mouth and wide bottom" shape of the dovetail structure allows the two to form a radial limit after they are fitted together: after the annular step is embedded in the annular groove, the side walls of the dovetail structure interlock with each other, restricting the separation of the sealing sleeve and the pressure adjusting screw in the radial direction, and only allowing the two to slide relative to each other in the axial direction and rotate relative to each other in the circumferential direction.

[0036] Attention all technical personnel: Although this utility model has been described according to the specific embodiments above, the concept of this utility model is not limited to this utility model. Any modification that utilizes the concept of this utility model will be included within the scope of protection of this patent right.

Claims

1. A pressure-regulating safety valve, comprising a valve sleeve, a valve body, a ejector pin, a spring, a spring seat, and a pressure-regulating assembly, wherein the valve sleeve is threadedly connected to the valve body, the top of the valve body is provided with a through hole communicating into the valve body, and the ejector pin is fitted into the valve body, with the top of the ejector pin engaging with the through hole in a telescopic fit, characterized in that: The pressure regulating assembly includes a pressure regulating screw, a sealing sleeve, and a first sealing ring; The pressure adjusting screw is threaded to the internal thread on the valve sleeve at the end away from the ejector pin. One end of the pressure adjusting screw is provided with a positioning post, and a ring groove is provided on the end face of the pressure adjusting screw located on one side of the positioning post. The sealing sleeve includes a bottom ring fitted onto the positioning post and a sleeve connected to the bottom ring. The bottom of the bottom ring is provided with an annular step that rotatably engages with the annular groove. At least one sealing ring groove is provided on the inner wall of the valve sleeve above the internal thread, and the first sealing ring is installed in the sealing ring groove and slides and seals with the sleeve.

2. The pressure-regulating safety valve according to claim 1, characterized in that: The end face of the pressure adjusting screw away from the positioning post is provided with a tool removal hole.

3. The pressure-regulating safety valve according to claim 1, characterized in that: One end of the spring is connected to the spring seat, and the other end is connected to the positioning post.

4. The pressure-regulating safety valve according to claim 1, characterized in that: The ejector pin is provided with a medium inlet, and multiple rows of first outlets are spaced apart on the outer wall of the ejector pin. The valve sleeve is provided with at least two rings of second outlets spaced apart.

5. The pressure-regulating safety valve according to claim 1, characterized in that: A second sealing ring is provided on the inner wall of the through hole.

6. The pressure-regulating safety valve according to claim 1, characterized in that: The spring seat is provided with a positioning concave surface that matches the top of the ejector pin.

7. The pressure-regulating safety valve according to claim 1, characterized in that: The cross-sections of the annular groove and the annular step are dovetail structures.

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