A full-lift threaded safety valve

Abstract

This utility model provides a full-opening threaded safety valve, relating to the field of fluid control equipment technology. It includes a valve body with a valve cover fixedly connected to the top, an inlet fixedly connected to the bottom, and an outlet fixedly connected to the right side. This utility model utilizes a rotating annular plate to drive a transmission gear ring to rotate within an annular groove. The transmission gear ring meshes with a transmission wheel, causing the transmission wheel to drive an internal threaded collar to rotate. The internal threaded collar engages with a threaded post, driving the threaded post to slide up and down within a connecting groove, thereby moving the upper spring seat. Through the coordinated operation of this series of structures, precise adjustment of the spring pressure can be quickly achieved without the need for complex tools, simply by rotating the annular plate. This significantly improves adjustment efficiency and allows operators to quickly set the opening pressure of the safety valve according to different working conditions, effectively solving the problems of cumbersome and low-precision spring pressure adjustment in traditional safety valves.

Description

Technical Field

[0001] This utility model relates to the field of fluid control equipment technology, and in particular to a full-open threaded safety valve. Background Technology

[0002] Safety valves are automatic valves that play a vital role in various industrial systems, pipelines, and pressure vessels. Their main function is to automatically open when the pressure in the system exceeds a predetermined value, quickly discharge excess media, and reduce the system pressure. When the pressure returns to the normal range, they automatically close, thereby ensuring the safe operation of equipment and systems. Full-lift threaded safety valves are widely used in petrochemical, power, and heating industries due to their large opening height, large discharge capacity, good sealing performance, and easy installation and disassembly via threaded connection.

[0003] The existing full-lift threaded safety valve has the following shortcomings:

[0004] Firstly, the spring pressure adjustment structure of traditional safety valves is cumbersome to operate, usually requiring multiple tools and complex disassembly and assembly steps to complete pressure adjustment. This not only consumes a lot of time and manpower, but also makes it difficult to guarantee adjustment accuracy and cannot quickly adapt to the opening pressure requirements of different working conditions. Secondly, in emergency situations such as a sharp rise in system pressure or failure of the automatic opening function of the safety valve, existing safety valves lack a convenient and reliable manual opening method. Once the automatic opening function fails, the medium cannot be discharged in time to reduce pressure, which can easily lead to serious safety accidents. At the same time, although some safety valves are equipped with a manual opening structure, they are not equipped with an effective anti-accidental trigger limit device. During daily operation, external collisions, misoperation, and other factors can easily cause the manual opening structure to be accidentally triggered, resulting in unnecessary medium discharge and system operation fluctuations. Utility Model Content

[0005] This utility model proposes a full-opening threaded connection safety valve. By improving the spring pressure adjustment structure and adding a convenient manual opening and anti-accidental contact limit structure, it can achieve rapid and accurate pressure adjustment, reliable manual opening in emergency situations, and avoid misoperation, thereby solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a full-opening threaded safety valve, comprising a valve body, a valve cover fixedly connected to the top of the valve body, an inlet fixedly connected to the bottom of the valve body, an outlet fixedly connected to the right side of the valve body, threaded connecting sleeves fixedly connected to the ends of the inlet and outlet away from the valve body, a connecting sleeve fixedly connected to the top of the valve cover, a lower spring seat slidably connected to the bottom of the inner surface of the connecting sleeve, an upper spring seat slidably connected to the top of the inner surface of the connecting sleeve, and a spring fixedly connected to the opposite surfaces of the lower spring seat and the upper spring seat. The top left and right sides of the spring seat are fixedly connected with threaded columns. The top left and right sides of the inner surface of the connecting sleeve are provided with connecting grooves. The threaded columns are slidably connected inside the connecting grooves. The outer surface of the threaded columns is threadedly connected with an internal threaded collar. The internal threaded collar is rotatably connected to the bottom of the inner surface of the connecting groove. The outer surface of the internal threaded collar is fixedly connected with a transmission wheel. The outer surfaces of the two transmission wheels are meshed with a transmission gear ring. The top of the outer surface of the connecting sleeve is provided with an annular groove. The transmission gear ring is rotatably connected inside the annular groove. The outer surface of the transmission gear ring is fixedly connected with an annular rotating plate.

[0007] Preferably, a valve stem that extends vertically through the middle of the lower spring seat and the upper spring seat is slidably connected, and the bottom end of the valve stem extends through to the bottom of the valve body and is fixedly connected to a full-open valve core, which is located at the top of the water inlet.

[0008] Preferably, a push block is fixedly connected to the middle of the outer surface of the valve stem, and the push block is disposed at the bottom of the lower spring seat.

[0009] Preferably, a valve cap is fixedly connected to the top of the connecting sleeve, and the top end of the valve stem extends through the interior of the valve cap and is fixedly connected to a connecting plate, wherein the outer surface of the connecting plate is slidably connected to the inner surface of the valve cap.

[0010] Preferably, the valve cap has a through groove running from left to right in the middle, and an annular top plate running from left to right is provided inside the through groove. The right end of the annular top plate is rotatably connected to the right side of the lower surface of the through groove. The annular top plate is located on the lower surface of the connecting plate, and a wrench is fixedly connected to the bottom left end of the annular top plate.

[0011] Preferably, a rotating column is rotatably connected to the lower surface of the through groove, and a rotating baffle is fixedly connected to the top of the rotating column. The rotating baffle is rotatably engaged with the top of the annular top plate.

[0012] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0013] 1. In this utility model, rotating the annular rotating plate drives the transmission gear ring to rotate within the annular groove. The transmission gear ring meshes with the transmission wheel, causing the transmission wheel to drive the internal threaded collar to rotate. The internal threaded collar engages with the threaded column, driving the threaded column to slide up and down within the connecting groove, thereby moving the upper spring seat. Through the cooperation of this series of structures, without the need for complex tools, precise adjustment of the spring pressure can be quickly achieved through a simple rotation operation of the annular rotating plate, greatly improving adjustment efficiency. This allows operators to quickly set the opening pressure of the safety valve according to different working conditions, effectively solving the problems of cumbersome and low-precision adjustment of the spring pressure of traditional safety valves.

[0014] 2. In this utility model, in an emergency, the wrench is turned to rotate the annular top plate, pushing the connecting plate to slide inside the valve cap, thereby causing the valve stem and the full-opening valve core to move upward, realizing the manual opening of the safety valve to discharge the medium. During normal operation, rotating the rotating column causes the rotating baffle to be locked on the upper surface of the annular top plate, limiting the annular top plate and the wrench, preventing accidental triggering of the manual opening structure due to external collisions, misoperation, etc. When manual opening is required, simply rotating the rotating baffle to release the restriction is sufficient. This structural design not only ensures that the safety valve can be reliably opened manually in an emergency, but also effectively avoids accidental activation during daily operation through the limiting device, enhancing the safety and reliability of the safety valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the full-opening threaded safety valve of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the valve cover of this utility model;

[0017] Figure 3 This is an enlarged structural schematic diagram of the upper spring seat of this utility model;

[0018] Figure 4 This is an enlarged structural schematic diagram of the rotating baffle of this utility model.

[0019] Legend: 1. Valve body; 11. Inlet; 12. Outlet; 13. Threaded connecting sleeve; 2. Valve cover; 21. Connecting sleeve; 22. Lower spring seat; 23. Upper spring seat; 231. Threaded column; 232. Internal threaded collar; 233. Drive wheel; 234. Drive gear ring; 235. Annular rotating plate; 24. Spring; 25. Valve stem; 26. Full-opening valve core; 27. Push block; 28. Valve cap; 29. ​​Connecting plate; 210. Annular top plate; 211. Wrench; 212. Rotating column; 213. Rotating baffle. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0022] Example 1: As Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a technical solution: It includes a valve body 1, a valve cover 2 fixedly connected to the top of the valve body 1, an inlet 11 fixedly connected to the bottom of the valve body 1, and an outlet 12 fixedly connected to the right side of the valve body 1. Threaded connecting sleeves 13 are fixedly connected to the ends of the inlet 11 and outlet 12 away from the valve body 1. A connecting sleeve 21 is fixedly connected to the top of the valve cover 2. A lower spring seat 22 is slidably connected to the bottom of the inner surface of the connecting sleeve 21, and an upper spring seat 23 is slidably connected to the top of the inner surface of the connecting sleeve 21. A spring 24 is fixedly connected to the opposite surfaces of the lower spring seat 22 and the upper spring seat 23. The top left and right sides of the upper spring seat 23 are fixedly... A threaded post 231 is connected. Connecting grooves are provided on the top left and right sides of the inner surface of the connecting sleeve 21. The threaded post 231 is slidably connected inside the connecting groove. An internal threaded collar 232 is threadedly connected to the outer surface of the threaded post 231. The internal threaded collar 232 is rotatably connected to the bottom of the inner surface of the connecting groove. A transmission wheel 233 is fixedly connected to the outer surface of the internal threaded collar 232. A transmission gear ring 234 is meshed on the outer surfaces of the two transmission wheels 233. An annular groove is provided on the top of the outer surface of the connecting sleeve 21. The transmission gear ring 234 is rotatably connected inside the annular groove. An annular rotating plate 235 is fixedly connected to the outer surface of the transmission gear ring 234.

[0023] The overall effect of Embodiment 1 is as follows: When it is necessary to adjust the opening pressure of the safety valve, the operator can directly rotate the annular rotating plate 235 by hand or with the help of simple tools. The annular rotating plate 235 drives the transmission gear ring 234 to make a circular motion in the annular groove. Since the transmission gear ring 234 meshes with the transmission wheel 233, the transmission wheel 233 rotates accordingly, which in turn drives the internal threaded collar 232 fixed thereto to rotate at the bottom of the inner surface of the connecting slide groove. The threaded engagement between the internal threaded collar 232 and the threaded column 231 converts the rotational motion into the up-and-down linear sliding of the threaded column 231 in the connecting slide groove, thereby driving the upper spring seat 23 to move up and down along the inner surface of the connecting sleeve 21. The movement of the upper spring seat 23 changes the compression degree of the spring 24, realizing precise adjustment of the spring pressure. Compared with the complex adjustment method of traditional safety valves, this structure is simple and convenient to operate, and the adjustment efficiency is greatly improved. It can quickly set the appropriate safety valve opening pressure according to different working conditions.

[0024] Example 2: As Figure 2 and Figure 4 As shown, this utility model provides a technical solution: a valve stem 25 that extends vertically through the middle of the lower spring seat 22 and the upper spring seat 23 is slidably connected. The bottom end of the valve stem 25 extends to the bottom of the valve body 1 and is fixedly connected to a full-opening valve core 26. The full-opening valve core 26 is located at the top of the inlet 11. A push block 27 is fixedly connected to the middle of the outer surface of the valve stem 25. The push block 27 is located at the bottom of the lower spring seat 22. A valve cap 28 is fixedly connected to the top of the connecting sleeve 21. The top end of the valve stem 25 extends into the interior of the valve cap 28 and is fixedly connected to a connecting plate 29. The connecting plate 29... The outer surface is slidably connected to the inner surface of the valve cap 28. A through groove is provided in the middle of the valve cap 28, and an annular top plate 210 is provided inside the through groove. The right end of the annular top plate 210 is rotatably connected to the right side of the lower surface of the through groove. The annular top plate 210 is provided on the lower surface of the connecting plate 29. A wrench 211 is fixedly connected to the bottom left end of the annular top plate 210. A rotating column 212 is rotatably connected to the lower surface of the through groove. A rotating baffle 213 is fixedly connected to the top of the rotating column 212. The rotating baffle 213 is rotatably engaged with the top of the annular top plate 210.

[0025] The overall effect of Embodiment 2 is as follows: During normal system operation, rotating the rotating column 212 causes the rotating baffle 213 to be locked on the upper surface of the annular top plate 210, thus limiting the annular top plate 210 and the wrench 211. This prevents the manual opening structure from being accidentally triggered due to external factors, ensuring stable system operation. In emergency situations such as a sharp increase in system pressure and failure of the automatic opening of the safety valve, the operator rotates the rotating column 212 to disengage the rotating baffle 213 from the annular top plate 210, releasing the limit. Then, the operator pulls the wrench 211, causing the annular top plate 210 to rotate around its right end in the through groove. When the annular top plate 210 rotates, it pushes the connecting plate 29 upward to slide inside the valve cap 28. The connecting plate 29 drives the full-open valve core 26 upward through the valve stem 25, making the inlet 11 connected to the inside of the valve body 1. The medium flows from the inlet 11 to the outlet 12 and is discharged, realizing the manual opening of the safety valve to discharge the medium, timely reducing system pressure, effectively responding to emergency situations, and ensuring the safety of equipment and system.

[0026] The working principle of the entire device is as follows: When the device is running normally, the medium enters the valve body 1 through the threaded connection sleeve from the inlet 11. When the system pressure is stable, the spring 24 is in a certain compressed state. Its elastic force acts on the valve stem 25 through the lower spring seat 22 and the push block 27, so that the full-open valve core 26 is tightly attached to the top of the inlet 11, preventing the medium from being discharged from the outlet 12. When the system pressure gradually rises and exceeds the pressure value set by the spring 24, the upward thrust of the medium on the full-open valve core 26 is greater than the elastic force of the spring 24. The full-open valve core 26 moves upward under the action of the valve stem 25, and the inlet 11 opens. A backwash plate and an adjusting ring are set in the full-open valve core 26 to realize the full opening of the valve. The medium is quickly discharged from the outlet 12, and the system pressure drops accordingly. When the pressure drops to the reset pressure set by the spring 24, the spring 24 pushes the full-open valve core 26 downward, resealing the inlet 11, completing the automatic opening and closing process.

[0027] If it is necessary to adjust the opening pressure of the safety valve, the position of the upper spring seat 23 is changed by rotating the annular rotating plate 235, using the transmission structure of the transmission gear ring 234, transmission wheel 233, internal threaded collar 232 and threaded column 231, thereby adjusting the compression degree of the spring 24 and accurately setting the opening pressure. In case of emergency and failure of automatic opening function, first rotate the rotating column 212 to release the limit of the rotating baffle 213 on the annular top plate 210, and then pull the wrench 211 to manually lift the full-opening valve core 26 through the annular top plate 210, connecting plate 29 and valve stem 25 to realize the manual opening of the safety valve, timely discharge of medium to reduce system pressure and ensure equipment safety.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A full-opening threaded safety valve, comprising a valve body (1), a valve cover (2) fixedly connected to the top of the valve body (1), an inlet (11) fixedly connected to the bottom of the valve body (1), an outlet (12) fixedly connected to the right side of the valve body (1), and threaded connecting sleeves (13) fixedly connected to the ends of the inlet (11) and the outlet (12) away from the valve body (1), characterized in that: A connecting sleeve (21) is fixedly connected to the top of the valve cover (2). A lower spring seat (22) is slidably connected to the bottom of the inner surface of the connecting sleeve (21). An upper spring seat (23) is slidably connected to the top of the inner surface of the connecting sleeve (21). A spring (24) is fixedly connected to the opposite surfaces of the lower spring seat (22) and the upper spring seat (23). Threaded posts (231) are fixedly connected to the top left and right sides of the upper spring seat (23). Connecting grooves are provided on the top left and right sides of the inner surface of the connecting sleeve (21). The threaded posts (231) are slidably connected to the connecting grooves. Inside the groove, the outer surface of the threaded column (231) is threaded with an internal threaded collar (232), which is rotatably connected to the bottom of the inner surface of the connecting groove. The outer surface of the internal threaded collar (232) is fixedly connected with a transmission wheel (233), and the outer surfaces of the two transmission wheels (233) are meshed with a transmission gear ring (234). The top of the outer surface of the connecting sleeve (21) is provided with an annular groove, and the transmission gear ring (234) is rotatably connected inside the annular groove. The outer surface of the transmission gear ring (234) is fixedly connected with an annular rotating plate (235).

2. The full-lift threaded safety valve according to claim 1, characterized in that: A valve stem (25) that runs vertically through the middle of the lower spring seat (22) and the upper spring seat (23) is slidably connected. The bottom end of the valve stem (25) extends to the bottom of the valve body (1) and is fixedly connected to a full-open valve core (26). The full-open valve core (26) is located at the top of the inlet (11).

3. A full-lift threaded safety valve according to claim 2, characterized in that: A push block (27) is fixedly connected to the middle of the outer surface of the valve stem (25), and the push block (27) is located at the bottom of the lower spring seat (22).

4. A full-lift threaded safety valve according to claim 2, characterized in that: The top of the connecting sleeve (21) is fixedly connected to a valve cap (28), and the top of the valve stem (25) extends through the interior of the valve cap (28) and is fixedly connected to a connecting plate (29). The outer surface of the connecting plate (29) is slidably connected to the inner surface of the valve cap (28).

5. A full-lift threaded safety valve according to claim 4, characterized in that: The valve cap (28) has a through groove running from left to right in the middle. An annular top plate (210) running from left to right is provided inside the through groove. The right end of the annular top plate (210) is rotatably connected to the right side of the lower surface of the through groove. The annular top plate (210) is provided on the lower surface of the connecting plate (29). A wrench (211) is fixedly connected to the bottom of the left end of the annular top plate (210).

6. A full-lift threaded safety valve according to claim 5, characterized in that: The lower surface of the through groove is rotatably connected to a rotating column (212), and the top of the rotating column (212) is fixedly connected to a rotating baffle (213). The rotating baffle (213) is rotatably engaged with the top of the annular top plate (210).

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