Longitudinal adjusting structure for valve rod of butterfly valve

Abstract

The utility model discloses a longitudinal adjusting structure for a valve rod of a butterfly valve, and belongs to the field of valve rods of butterfly valves, the longitudinal adjusting structure for the valve rod of the butterfly valve comprises a valve body and a valve rod rotatably mounted on the valve body, and a valve cover sleeving the valve rod is fixedly mounted at the top end of the valve body through a hexagon socket screw. A sealing shaft sleeve moving in the axial direction of the valve rod penetrates through the center of the valve cover, a shaft sleeve ring wing is arranged at the position, inside the valve cover, of the outer wall of the sealing shaft sleeve, and a sealing gasket bonded to the inner wall of the valve cover is arranged on the side, close to the valve body, of the shaft sleeve ring wing. Four adjusting bolts distributed in an annular array mode are connected to the top of the valve deck in a threaded mode, and the bottom ends of the adjusting bolts make contact with the top face of the annular wing of the shaft sleeve. According to the longitudinal adjusting structure for the valve rod of the butterfly valve, the tension degree of the valve rod can be adjusted without disassembling the end cover, fine adjustment of the valve rod in the axial direction can be achieved by rotating the adjusting bolt, the adjusting steps are greatly simplified, and the maintenance efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of butterfly valve stems, and specifically to a longitudinal adjustment structure for a butterfly valve stem. Background Art

[0002] A butterfly valve stem is a component that connects a butterfly plate (or called a valve flap) and a transmission device (such as a handwheel, an electric device, etc.). It drives the butterfly plate to rotate around its own axis in the valve body by rotation, thereby realizing the opening and closing of the valve.

[0003] The Chinese utility model patent with the publication number CN221569447U discloses a longitudinal adjustment structure for a butterfly valve stem, which includes a valve body, a valve stem, an end cover, and a stopper. It connects the valve stem through the first bolts symmetrically arranged on the stopper, and tightly presses the bottom end of the valve stem through the set screws symmetrically arranged on the stopper, and the valve stem can be pushed to be tensioned by tightening the set screws to solve the loosening problem. However, an end cover used to cover the stopper is also fixedly installed at the bottom end of the valve stem. Each time the tension degree of the valve stem is adjusted and maintained, the end cover needs to be disassembled before the set screws can be adjusted, and the maintenance steps are cumbersome, affecting the efficiency.

[0004] Therefore, the present application provides a longitudinal adjustment structure for a butterfly valve stem to solve the above problems. Summary of the Utility Model

[0005] The present application provides a longitudinal adjustment structure for a butterfly valve stem, aiming to solve the problem of low efficiency caused by the cumbersome operation steps in the adjustment and maintenance of the existing longitudinal adjustment structure for a butterfly valve stem in the background art.

[0006] To achieve the above purpose, the present application provides the following technical solution: A longitudinal adjustment structure for a butterfly valve stem, including a valve body and a valve stem rotatably installed on the valve body.

[0007] A valve cover sleeved outside the valve stem is fixedly installed at the top end of the valve body through an inner hexagon bolt. A sealing shaft sleeve moving axially along the valve stem penetrates through the center of the valve cover. The outer wall of the sealing shaft sleeve has a shaft sleeve ring wing at a position inside the valve cover. A sealing gasket adhered to the inner wall of the valve cover is provided on one side of the shaft sleeve ring wing close to the valve body. Four adjusting bolts distributed in a circumferential array are screwed on the top of the valve cover, and the bottom ends of the adjusting bolts are all in contact with the top surface of the shaft sleeve ring wing.

[0008] The sealing shaft sleeve is sleeved outside the valve stem and is rotatably connected to the valve stem. The outer wall of the valve stem has a valve stem ring wing, and a ring groove for accommodating the valve stem ring wing is provided on the inner wall of the sealing shaft sleeve.

[0009] The top end of the valve stem is provided with a pentagonal slot, and an extension rod for connecting with the output end of an external driving device is inserted into the pentagonal slot. In this way, the tension of the valve stem can be adjusted without disassembling the end cover, and the fine adjustment of the valve stem in the axial direction can be achieved by rotating the adjusting bolt, greatly simplifying the adjustment steps and improving the maintenance efficiency.

[0010] Preferably, the top end of the valve cover is fixedly connected with a fixing frame for supporting and fixing the driving device through a support rod, and a through hole for accommodating the extension rod to pass through is provided at the center of the fixing frame.

[0011] Preferably, a spring whose two ends are respectively in contact with the top surface of the sleeve ring wing and the inner wall of the top end of the valve cover is sleeved outside the sealing shaft sleeve.

[0012] Preferably, a locking nut sleeved outside the adjusting bolt is rotatably connected to the top end of the valve cover, and the locking nut is screwed with the adjusting bolt.

[0013] Preferably, the thickness of the sleeve ring wing is less than the height inside the valve cover.

[0014] Preferably, O-ring seals are arranged at both ends of the sealing shaft sleeve.

[0015] For the longitudinal adjustment structure of the butterfly valve stem, the tension of the valve stem can be adjusted without disassembling the end cover, and the fine adjustment of the valve stem in the axial direction can be achieved by rotating the adjusting bolt, greatly simplifying the adjustment steps and improving the maintenance efficiency.

[0016] For the longitudinal adjustment structure of the butterfly valve stem, the design of the pentagonal slot makes the connection between the extension rod and the valve stem more flexible and stable, and can adapt to different specifications and types of external driving devices, improving the versatility and adaptability of the valve. Description of the Drawings

[0017] Figure 1 It is a schematic structural diagram of a longitudinal adjustment structure of a butterfly valve stem;

[0018] Figure 2 It is a partial structural schematic diagram of the side truncation of a longitudinal adjustment structure of a butterfly valve stem;

[0019] Figure 3 It is an internal structural schematic diagram of the sealing shaft sleeve in a longitudinal adjustment structure of a butterfly valve stem.

[0020] In the figure:

[0021] 1. Valve body; 2. Valve cover; 21. Hexagon socket head cap screw; 3. Valve stem; 31. Valve stem ring wing; 32. Pentagonal slot; 4. Extension rod;

[0022] 5. Sealing shaft sleeve; 51. Sleeve ring wing; 6. Sealing gasket; 7. Adjusting bolt; 71. Locking nut;

[0023] 8. Fixed bracket; 81. Support rod; 9. Spring. Specific implementation manner

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] This embodiment provides a longitudinal adjustment structure for a butterfly valve stem. As Figures 1 - 3 shown, this longitudinal adjustment structure for a butterfly valve stem includes a valve body 1 and a valve stem 3 rotatably installed on the valve body 1.

[0026] A valve cover 2 sleeved outside the valve stem 3 is fixedly installed at the top end of the valve body 1 through an inner hexagon bolt 21. A sealing shaft sleeve 5 that axially moves along the valve stem 3 penetrates through the center of the valve cover 2. At the position of the outer wall of the sealing shaft sleeve 5 inside the valve cover 2, there is a shaft sleeve ring wing 51. On the side of the shaft sleeve ring wing 51 close to the valve body 1, there is a sealing gasket 6 adhesively connected to the inner wall of the valve cover 2. Four adjusting bolts 7 distributed in a circular array are screwed on the top of the valve cover 2, and the bottom ends of the adjusting bolts 7 are all in contact with the top surface of the shaft sleeve ring wing 51.

[0027] The sealing shaft sleeve 5 is sleeved outside the valve stem 3 and is rotatably connected to the valve stem 3. The outer wall of the valve stem 3 has a valve stem ring wing 31, and a ring groove for accommodating the valve stem ring wing 31 is provided on the inner wall of the sealing shaft sleeve 5.

[0028] A pentagonal socket 32 is provided at the top end of the valve stem 3, and an extension rod 4 for connecting to the output end of an external driving device is inserted into the pentagonal socket 32.

[0029] When in use, when it is necessary to adjust the longitudinal position of the valve stem 3 to improve the seal, by rotating the adjusting bolt 7, the adjusting bolt 7 is pushed deeper into the valve cover 2, thereby pushing the shaft sleeve ring wing 51 to move axially, thereby pushing the sealing shaft sleeve 5 to move axially, and pressing the sealing gasket 6 through the shaft sleeve ring wing 51. Since the sealing shaft sleeve 5 is rotatably connected to the valve stem 3, and the valve stem 3 is restricted by the valve stem ring wing 31 and the ring groove structure, the movement of the sealing shaft sleeve 5 will drive a slight adjustment of the valve stem 3 in the axial direction without changing its rotational freedom. Therefore, the tension of the valve stem 3 can be adjusted without disassembling the end cover. By rotating the adjusting bolt 7, the fine adjustment of the valve stem 3 in the axial direction can be realized, which greatly simplifies the adjustment steps and improves the maintenance efficiency.

[0030] Further, the top end of the valve cover 2 is fixedly connected with a fixing frame 8 for supporting and fixing the driving device through a support rod 81. The center of the fixing frame 8 has a relief hole for the extension rod 4 to pass through. By fixing the fixing frame 8 to the top end of the valve cover 2 through the support rod 81, a stable support platform is provided for the external driving device, which not only enhances the stability of the driving device during operation but also reduces looseness and failures caused by factors such as vibration. The relief hole in the center of the fixing frame ensures that the extension rod 4 can pass through smoothly and be connected to the driving device.

[0031] Further, a spring 9 is sleeved outside the sealing bushing 5, and both ends of the spring 9 are in contact with the top surface of the bushing ring wing 51 and the inner wall of the top end of the valve cover 2 respectively. The continuous force exerted by the spring 9 can ensure that the bushing ring wing 51 always presses tightly against the sealing gasket 6 and plays a buffering role when subjected to external force impacts, protecting the valve stem 3 and the sealing structure from damage and ensuring a good sealing effect.

[0032] Furthermore, a lock nut 71 sleeving the adjusting bolt 7 is rotatably connected to the top end of the valve cover 2, and the lock nut 71 is screwed with the adjusting bolt 7. By rotatably connecting the lock nut 71 outside the adjusting bolt 7 and screwing it with the adjusting bolt 7, in this way, after the adjustment is completed, the position of the adjusting bolt 7 can be fixed by tightening the lock nut 71 to prevent it from loosening due to factors such as vibration during operation, thereby improving the accuracy and safety of the adjustment.

[0033] It should be noted that the thickness of the bushing ring wing 51 is less than the height inside the valve cover 2; this ensures the movement space of the bushing ring wing 51 inside the valve cover 2 and provides a basis for realizing the longitudinal adjustment of the valve stem 3.

[0034] In addition, O-ring seals are provided at both ends of the sealing bushing 5. By providing O-ring seals at both ends of the sealing bushing 5, the sealing performance between the sealing bushing and the valve cover can be further enhanced, which helps prevent the medium from leaking from the sealing part and improves the overall sealing performance and working reliability of the valve.

[0035] The above is only the preferred specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application, according to the technical solution and its concept of the present application, makes equivalent substitutions or changes, and should be covered within the protection scope of the present application.

Claims

1. A longitudinal adjustment structure for a butterfly valve stem, comprising a valve body (1) and a valve stem (3) rotatably installed on the valve body (1), characterized in that: At the top of the valve body (1), a valve cover (2) sleeved outside the valve stem (3) is fixedly installed through an internal hexagonal bolt (21). A sealing shaft sleeve (5) axially moving along the valve stem (3) penetrates through the center of the valve cover (2). At the position of the outer wall of the sealing shaft sleeve (5) inside the valve cover (2), there is a shaft sleeve ring wing (51). On one side of the shaft sleeve ring wing (51) close to the valve body (1), there is a sealing gasket (6) adhesively bonded to the inner wall of the valve cover (2). Four adjusting bolts (7) distributed in a circular array are screwed on the top of the valve cover (2), and the bottom ends of the adjusting bolts (7) are all in contact with the top surface of the shaft sleeve ring wing (51). The sealing shaft sleeve (5) is sleeved outside the valve stem (3) and is rotatably connected to the valve stem (3). There is a valve stem ring wing (31) on the outer wall of the valve stem (3), and a ring groove for accommodating the valve stem ring wing (31) is formed in the inner wall of the sealing shaft sleeve (5). A pentagonal socket (32) is formed at the top end of the valve stem (3), and an extension rod (4) for connecting to the output end of an external driving device is inserted into the pentagonal socket (32).

2. The longitudinal adjustment structure of the butterfly valve stem according to claim 1, wherein: At the top end of the valve cover (2), a fixing bracket (8) for supporting and fixing the driving device is fixedly connected through a support rod (81). A relief hole for accommodating the extension rod (4) to pass through is formed at the center of the fixing bracket (8).

3. The longitudinal adjustment structure of the butterfly valve stem according to claim 2, wherein: A spring (9) whose two ends are respectively in contact with the top surface of the shaft sleeve ring wing (51) and the inner wall of the top end of the valve cover (2) is sleeved outside the sealing shaft sleeve (5).

4. The longitudinal adjustment structure of the butterfly valve stem according to claim 3, characterized in that: A locking nut (71) sleeved outside the adjusting bolt (7) is rotatably connected to the top end of the valve cover (2), and the locking nut (71) is screwed with the adjusting bolt (7).

5. The longitudinal adjustment structure of the butterfly valve stem according to claim 4, characterized in that: The thickness of the shaft sleeve ring wing (51) is less than the height inside the valve cover (2).

6. The longitudinal adjustment structure of the butterfly valve stem according to claim 5, characterized in that: O-ring seals are arranged at both ends of the sealing shaft sleeve (5).

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