Butterfly valve capable of preventing valve seat from falling off

Abstract

The butterfly valve comprises a valve body, the valve seat and a valve plate, the valve seat is arranged in the valve body in a sleeved mode, the valve plate is arranged in the valve body in a rotating mode, a fluid channel is arranged in the valve seat, rotation of the valve plate is used for opening or closing the fluid channel, a threaded hole is formed in the outer wall of the valve seat and penetrates through the side wall of the valve seat, and the valve plate is arranged in the valve body. A set screw is arranged in the threaded hole, the end of the set screw is used for being inserted into the valve seat to limit axial displacement of the valve seat, and a limiting assembly used for limiting the two end faces of the valve seat is arranged on the end face of the valve body. According to the butterfly valve, the valve seat can be effectively prevented from falling off, the stability of the valve seat in the long-term use process can be kept, and therefore the service life of the butterfly valve is prolonged, and the working reliability of the butterfly valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a butterfly valve capable of preventing a valve seat from falling off. Background Art

[0002] The butterfly valve is a simple regulating valve. The working principle of the butterfly valve is to open and close the valve by rotating the disc-shaped valve plate, thereby controlling the flow of the fluid medium. The butterfly valve is mainly used for cutting and throttling in the pipeline system and has a wide range of applications. The butterfly valve is mainly composed of a valve body, a valve plate, a valve stem, a valve seat and a transmission device. Among them, the valve plate is the opening and closing part of the butterfly valve, which rotates around the valve shaft to open or close the valve. The valve seat provides a channel for the fluid to flow and cooperates with the valve plate to achieve sealing.

[0003] In the actual production process, the valve seat is generally a rubber part, which is fixed by close contact with the inner wall of the valve body, making installation more convenient. However, the problem with this method is that in actual use, the valve seat is prone to axial movement when the fluid flows. In severe cases, the valve seat may fall off and lose its sealing effect. Utility Model Content

[0004] The utility model aims to provide a butterfly valve which can prevent the valve seat from falling off, so as to solve the above problems existing in the current butterfly valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A butterfly valve for preventing a valve seat from falling off comprises a valve body, a valve seat and a valve plate, wherein the valve seat is sleeved in the valve body, the valve plate is rotatably arranged in the valve body, a fluid channel is arranged in the valve seat, and the rotation of the valve plate is used to open or close the fluid channel, a threaded hole is arranged on the outer wall of the valve seat, the threaded hole passes through the side wall of the valve seat, a set screw is arranged in the threaded hole, the end of the set screw is used to be inserted into the valve seat to limit the axial displacement of the valve seat, and a limit assembly for limiting the two end surfaces of the valve seat is arranged on the end surface of the valve body.

[0007] Furthermore, a plurality of threaded holes are provided, and the threaded holes are spaced apart circumferentially along the outer wall of the valve body, and the set screw is correspondingly provided in each threaded hole.

[0008] Furthermore, one end of the set screw is provided with a cone portion for being inserted into the valve seat.

[0009] Furthermore, the limit assembly includes a limit snap ring, the end face of the valve body is provided with a receiving groove for accommodating the limit snap ring, both end faces of the valve seat are axially inwardly provided with clamping grooves for the limit snap ring to be clamped, the limit snap ring is fixed on the end face of the valve body, and the limit snap ring is used to clamp with the valve seat to limit the axial displacement of the valve seat.

[0010] Furthermore, a locking plate is extended outwardly on one end surface of the limiting clamp, and a locking hole is provided on the locking plate. The locking hole is used to correspond to the threaded hole after the limiting clamp is placed in the receiving groove, and the set screw is used to pass through the locking hole to fix the limiting clamp.

[0011] Furthermore, two locking plates are provided, and the two locking plates are symmetrically arranged in the radial direction of the limiting clamping ring.

[0012] Furthermore, an avoidance groove is provided through the edge of the valve seat along the axial direction, and the locking plate is provided through the avoidance groove.

[0013] Furthermore, the avoidance groove is provided in plurality, and each of the avoidance grooves is arranged at intervals along the circumferential direction of the outer wall of the valve seat.

[0014] Beneficial effects of the utility model:

[0015] The utility model discloses a butterfly valve that prevents the valve seat from falling off. By providing a threaded hole on the outer wall of the valve seat and installing a set screw in the hole, the displacement of the valve seat of the butterfly valve in the axial direction is effectively limited. This design significantly improves the stability of the valve seat during operation and reduces the risk of the valve seat moving or falling off due to fluid flow. The fixing effect of the set screw ensures that the relative position between the valve seat and the valve body remains unchanged, thereby effectively preventing the sealing failure caused by the movement of the valve seat. This is crucial to ensure that the butterfly valve maintains good sealing performance during long-term operation. By reducing the movement and falling off of the valve seat, the design extends the service life of the butterfly valve. The stable relationship between the valve seat and the valve body reduces the possibility of wear and damage, thereby reducing the frequency of maintenance and replacement. At the same time, in conjunction with the limit assembly, it can further increase the stability of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram (stereoscopic diagram) of a butterfly valve for preventing the valve seat from falling off according to the utility model;

[0017] Figure 2 It is a structural schematic diagram (explosion diagram) of a butterfly valve for preventing the valve seat from falling off according to the utility model;

[0018] Figure 3 It is a structural schematic diagram of a valve body in a butterfly valve for preventing a valve seat from falling off according to the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the valve seat in the butterfly valve for preventing the valve seat from falling off according to the utility model;

[0020] Figure 5 The utility model is a structural schematic diagram of a set screw in a butterfly valve for preventing a valve seat from falling off.

[0021] The names corresponding to the marks in the figure are:

[0022] The valve body 10 , the accommodating groove 11 , the valve seat 20 , the fluid channel 21 , the threaded hole 22 , the clamping groove 23 , the avoidance groove 24 , the valve plate 30 , the set screw 40 , the cone 41 , the limit clamping ring 50 , the locking plate 51 , and the locking hole 52 . DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0024] like Figures 1 to 5 As shown, the butterfly valve for preventing the valve seat from falling off comprises a valve body 10, a valve seat 20 and a valve plate 30. The valve seat 20 is sleeved in the valve body 10, and the valve plate 30 is arranged in the valve body 10 by rotating the valve stem, and is driven to rotate by an external transmission device. A fluid channel 21 is arranged in the valve seat 20, and the rotation of the valve plate 30 is used to control the opening and closing state of the fluid channel 21, thereby realizing the opening and closing function of the butterfly valve.

[0025] In order to prevent the valve seat 20 from axial displacement due to fluid impact during use, a threaded hole 22 is provided on the outer wall of the valve seat 20. The threaded hole 22 passes through the side wall of the valve seat 20. A set screw 40 is provided in each threaded hole 22, and the end of the set screw 40 is designed to be a cone 41 so that it is easier to insert into the valve seat 20, thereby limiting the axial displacement of the valve seat 20.

[0026] In this embodiment, Figure 3 As shown, a plurality of threaded holes 22 are provided, which are spaced apart circumferentially along the outer wall of the valve seat 20. This design not only enhances the stability of the valve seat 20, but also enables the set screw 40 to apply a fixing force more evenly, thereby preventing the valve seat 20 from being displaced too much in any direction.

[0027] A limit assembly is also provided on the end surface of the valve body 10 to further limit the axial displacement of the valve seat 20 . Figure 2 - Figure 4As shown, the limiting assembly includes a limiting clamp ring 50, and the end surface of the valve body 10 is provided with a receiving groove 11 for receiving the limiting clamp ring 50. At the same time, both end surfaces of the valve seat 20 are provided with clamping grooves 23 inwardly, and these clamping grooves 23 match the limiting clamp ring 50, so that the limiting clamp ring 50 can be clamped on the valve seat 20, thereby further limiting the axial displacement of the valve seat 20.

[0028] In order to enhance the fixing effect of the limiting clamp ring 50 , a locking plate 51 is further provided on one end surface of the limiting clamp ring 50 extending outward. Figure 2 As shown, a locking hole 52 is provided on the locking plate 51. When the limiting clamp ring 50 is placed in the receiving groove 11, the locking hole 52 will be arranged corresponding to the threaded hole 22. At this time, the set screw 40 can pass through the locking hole 52, which not only fixes the valve seat 20, but also fixes the limiting clamp ring 50, thereby achieving a double fixing effect.

[0029] In this embodiment, two locking plates 51 are provided, and they are symmetrically arranged in the radial direction of the limiting clamp ring 50, which not only enhances the stability of the fixation, but also makes the entire structure more balanced.

[0030] also, Figure 4 As shown, the edge of the valve seat 20 is also provided with avoidance grooves 24, which are arranged through in the axial direction to allow the locking plate 51 to pass through. A plurality of avoidance grooves 24 are also provided, and are distributed at intervals along the circumferential direction of the outer wall of the valve seat 20, so as to avoid interference between the limit clamping rings 50 on both sides after the limit clamping rings 50 are installed on both end surfaces of the valve body 10, so that the limit clamping rings 50 on both sides can be arranged in a staggered manner.

[0031] Through the above design, the butterfly valve of the utility model can not only effectively prevent the valve seat from falling off, but also maintain the stability of the valve seat during long-term use, thereby extending the service life of the butterfly valve and improving its working reliability.

[0032] Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the utility model.

Claims

1. A butterfly valve for preventing valve seat from falling off, characterized in that: The utility model comprises a valve body, a valve seat and a valve plate, wherein the valve seat is sleeved in the valve body, the valve plate is rotatably arranged in the valve body, a fluid channel is arranged in the valve seat, and the rotation of the valve plate is used to open or close the fluid channel, a threaded hole is arranged on the outer wall of the valve seat, the threaded hole passes through the side wall of the valve seat, a fixing screw is arranged in the threaded hole, the end of the fixing screw is used to be inserted into the valve seat to limit the axial displacement of the valve seat, and a limit assembly for limiting the two end faces of the valve seat is arranged on the end face of the valve body.

2. The butterfly valve for preventing valve seat from falling off according to claim 1, characterized in that: There are a plurality of threaded holes, each of which is arranged at intervals along the circumferential direction of the outer wall of the valve body, and each of the threaded holes is correspondingly provided with the set screw.

3. The butterfly valve for preventing valve seat from falling off according to claim 2, characterized in that: One end of the set screw is provided with a cone portion for being placed in the valve seat.

4. The butterfly valve for preventing valve seat from falling off according to claim 3, characterized in that: The limit assembly includes a limit snap ring, the end face of the valve body is provided with a receiving groove for accommodating the limit snap ring, both end faces of the valve seat are axially inwardly provided with clamping grooves for the limit snap ring to be clamped, the limit snap ring is fixed on the end face of the valve body, and the limit snap ring is used to clamp with the valve seat to limit the axial displacement of the valve seat.

5. The butterfly valve for preventing valve seat from falling off according to claim 4, characterized in that: A locking plate is extended outwardly from one end surface of the limiting clamp, and a locking hole is provided on the locking plate. The locking hole is used to correspond to the threaded hole after the limiting clamp is placed in the receiving groove, and the set screw is used to pass through the locking hole to fix the limiting clamp.

6. The butterfly valve for preventing valve seat from falling off according to claim 5, characterized in that: The locking plates are provided with two, and the two locking plates are symmetrically arranged in the radial direction of the limiting clamp ring.

7. The butterfly valve for preventing valve seat from falling off according to claim 6, characterized in that: The valve seat edge is provided with an escape groove extending through the valve seat edge in the axial direction, and the locking plate is provided through the escape groove.

8. The butterfly valve for preventing valve seat from falling off according to claim 7, characterized in that: A plurality of the avoidance grooves are provided, and the avoidance grooves are arranged at intervals along the circumferential direction of the outer wall of the valve seat.

Images