Sealing butterfly valve

Abstract

The utility model discloses a sealing butterfly valve, which relates to the technical field of butterfly valves, and comprises a valve body, a valve seat, a butterfly plate, a valve rod and a base, the valve seat is arranged in the valve body, the butterfly plate is arranged on the valve rod and synchronously moves along with the valve rod, the sealing butterfly valve further comprises a valve seat pressure plate arranged on the outer side of the valve body, and a sealing assembly is arranged on the valve seat. The sealing assembly is provided with an elastic abutting part, a limiting part and a fixing part, the limiting part is provided with a limiting protrusion, the outer side face of the valve body, the inner wall of the valve seat pressing disc and the outer side face of the valve seat jointly form a cavity for containing the sealing assembly, and the cavity comprises a limiting groove matched with the limiting protrusion, a fixing groove matched with the fixing part and an abutting groove. One end of the elastic abutting part is provided with an abutting face abutting against the butterfly plate, and the other end of the elastic abutting part abuts against the abutting groove. Through the arrangement, when the butterfly valve is in a closed state and the sealing assembly is extruded, elastic force can be reversely applied to the butterfly valve, so that the butterfly valve is tightly matched with the sealing assembly, and the sealing performance of the butterfly valve is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a sealing butterfly valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on-off control of low-pressure pipeline media. A butterfly valve refers to a valve whose closing member (valve disc or butterfly plate) is a disc that rotates around the valve axis to achieve opening and closing. The butterfly valve mainly plays a cutting and throttling role in the pipeline.

[0003] At present, after some butterfly valves on the market have been used for a long time, the seal between the butterfly valve and the butterfly plate will become loose, causing the butterfly valve to leak even when it is closed. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings and deficiencies of the prior art and to provide a sealing butterfly valve.

[0005] The technical scheme adopted by the utility model is as follows: a valve body, a valve seat, a butterfly plate, a valve stem and a base, a flow channel is arranged on the valve body, the valve stem is arranged on the valve body in a direction perpendicular to the flow channel, the valve seat is arranged inside the valve body, the butterfly plate is arranged on the valve stem and moves synchronously with the valve stem, and the butterfly plate and the valve seat seal cooperate to form a closure of the flow channel;

[0006] The sealing butterfly valve also includes a valve seat pressure plate arranged on the outside of the valve body, a sealing assembly is provided on the valve seat, and the sealing assembly has an elastic abutment portion, a limiting portion and a fixing portion, the limiting portion is provided with a limiting protrusion, the outer side surface of the valve body, the inner wall of the valve seat pressure plate and the outer side surface of the valve seat together form a cavity for placing the sealing assembly, the cavity includes a limiting groove matched with the limiting protrusion, a fixing groove and an abutment groove matched with the fixing portion, one end of the elastic abutment portion has an abutment surface abutting against the butterfly plate and the other end abuts against the abutment groove.

[0007] Preferably, the butterfly plate includes a sealing surface abutting against the elastic abutment portion, the abutment groove is formed by a first abutment groove provided on the valve body and a second abutment groove provided on the valve seat pressure plate, and the elastic abutment portion and the sealing surface and the abutment groove form a chamber of the same size.

[0008] Preferably, a metal frame supporting the elastic abutting portion is provided inside the elastic abutting portion, and the metal frame is respectively arranged between the first abutting groove and the abutting surface and between the second abutting groove and the abutting surface.

[0009] Preferably, the abutting surface on the elastic abutting portion is in a curved shape.

[0010] Preferably, the cross-sectional length of the abutting surface on the elastic abutting portion is greater than the cross-sectional length of the sealing surface.

[0011] Preferably, the inner diameter of the fixing groove is larger than the diameter of its opening.

[0012] Preferably, the valve seat pressure plate is fixed to the valve body by bolts, the valve seat pressure plate is provided with screw holes for bolt fixing, and the valve body is provided with bolt grooves adapted for the bolts.

[0013] Preferably, the valve seat pressure plate has a fixed state in which it is fixedly connected to the valve body and an active state in which part of the valve seat pressure plate is rotated to a position away from the valve seat after the bolts are removed. A rotating shaft is provided between the valve seat pressure plate and the valve body. The valve seat pressure plate rotates outside the valve seat around the rotating shaft, and the rotating shaft is provided at the bottom of the valve seat pressure plate.

[0014] Preferably, a handle is provided at the middle position of the movable end of the valve seat pressure plate.

[0015] The beneficial effects of the utility model are as follows: the utility model provides a sealing butterfly valve, which can give the butterfly valve an elastic force in the reverse direction when the sealing component is squeezed by the sealing component when the butterfly valve is in a closed state, so that the butterfly valve and the sealing component are closely matched, thereby enhancing the sealing performance of the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the utility model.

[0017] Figure 1 It is a front view of the utility model;

[0018] Figure 2 yes Figure 1 It is a side view of the utility model;

[0019] Figure 3 yes Figure 2 A is an enlarged schematic diagram;

[0020] Figure 4 yes Figure 2 A is an enlarged schematic diagram;

[0021] In the figure, 1-valve body, 2-valve seat, 3-butterfly plate, 4-valve stem, 5-base, 12-valve seat pressure plate, 13-bolt;

[0022] 21-elastic abutting portion, 22-limiting portion, 23-fixing portion, 24-abutting surface, 31-sealing surface;

[0023] 231-fixing groove, 221-limiting protrusion, 211-metal frame, 223-limiting groove, 226-second abutting groove, 227-first abutting groove,

[0024] 112-rotation axis, 113-handle; DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0027] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are used to explain and understand the present invention, but not to limit the scope of protection of the present invention.

[0028] The following combination Figure 1-Figure 4 This application is described in further detail.

[0029] This is an embodiment of a sealed butterfly valve of the utility model, the sealed butterfly valve comprises a valve body 1, a valve seat 2, a butterfly plate 3, a valve stem 4 and a base 5, a flow channel is arranged on the valve body 1, the valve stem 4 is arranged on the valve body 1 in a direction perpendicular to the flow channel, the valve seat 2 is arranged inside the valve body 1, the butterfly plate 3 is arranged on the valve stem 4 and moves synchronously with the valve stem 4, and the butterfly plate 3 and the valve seat 2 are sealed to form a closure of the flow channel;

[0030] The sealing butterfly valve also includes a valve seat pressure plate 12 arranged on the outside of the valve body 1, and a sealing component is provided on the valve seat 2, and the sealing component has an elastic abutment portion 21, a limiting portion 22 and a fixing portion 23, and a limiting protrusion 221 is provided on the limiting portion 22. The outer side surface of the valve body 1, the inner wall of the valve seat pressure plate 12 and the outer side surface of the valve seat 2 jointly form a cavity for placing the sealing component, and the cavity includes a limiting groove 223 adapted to the limiting protrusion 221, a fixing groove 231 adapted to the fixing portion 23 and an abutment groove, and one end of the elastic abutment portion 21 has an abutment surface 24 abutting against the butterfly plate 3, and the other end abuts against the abutment groove.

[0031] It can be understood that the sealing assembly is arranged between the valve seat 2, the butterfly plate 3 and the valve seat pressure plate 12. When the butterfly plate 3 is in a closed state, the limiting portion 22 and the fixing portion 23 fix the position of the sealing assembly when the elastic abutting portion 21 is squeezed, and at the same time, the butterfly plate 3 is squeezed in a direction so that the elastic abutting portion 21 and the butterfly plate 3 are tightly matched. In this embodiment, the fixing portion 23 is arc-shaped and is elastically deformable to ensure that the utility model can be assembled normally.

[0032] The butterfly plate 3 includes a sealing surface 31 abutting against the elastic abutment portion 21, and the abutment groove is formed by a first abutment groove 227 provided on the valve body 1 and a second abutment groove 226 provided on the valve seat pressure plate 12. The elastic abutment portion 21 is consistent in size with the chamber formed by the sealing surface 31 and the abutment groove. It can be understood that the elastic abutment portion 21 is fully placed in the abutment groove, and when the butterfly plate 3 squeezes the elastic abutment portion 21, the elastic abutment portion 21 abuts against the first abutment groove 227 and the second abutment groove 226, and at the same time, the elastic abutment portion 21 has an elastic force for squeezing the butterfly plate 3 in a direction so that the sealing surface 31 of the butterfly plate 3 is tightly matched with the sealing assembly.

[0033] A metal frame 211 supporting the elastic abutting portion 21 is provided in the elastic abutting portion 21, and the metal frame 211 is respectively arranged between the first abutting groove 227 and the abutting surface 24 and between the second abutting groove 226 and the abutting surface 24. It can be understood that the metal frame 211 made of a rigid material helps the elastic abutting portion 21 to exert a force on the sealing surface 31 of the butterfly plate 3 in the opposite direction, so that the sealing surface 31 of the butterfly plate 3 is closely matched with the sealing component. The metal frame 211 is arranged at the relative position of the first abutting groove 227 and the second abutting groove 226, and there is a gap between the two metal frames 211. When the butterfly plate 3 squeezes the elastic abutting portion 21, the metal frames 211 on both sides provide force to the elastic abutting portion 21 so that the elastic abutting portion 21 is closely matched with the butterfly plate 3. At the same time, the sealing surface 31 on the butterfly plate 3 at the position where the metal frame 211 is not arranged is slightly raised. At this time, the sealing surface 31 forms a curved structure with a small slope, which increases the contact area with the elastic abutting portion 21 and enhances the sealing effect.

[0034] The abutting surfaces 24 on the elastic abutting portion 21 are all curved surfaces, and the length of the abutting surfaces 24 of the elastic abutting portion 21 is greater than the sealing surface 31 of the butterfly plate 3. It can be understood that the curved surface increases the contact area between the butterfly plate 3 and the sealing component to enhance the sealing effect. At the same time, the butterfly plate 3 rubs against the elastic abutting portion 21 during axial rotation, and the curved surface structure of the abutting portion 24 needs to be replaced when the friction reaches a flat state. At the same time, the length of the abutting surface 24 is greater than the length of the sealing surface 31, so that when the butterfly plate 3 squeezes the sealing component, the outer side of the abutting surface 24 can wrap around the sealing surface 31 to enhance the sealing effect.

[0035] The inner diameter of the fixing groove 231 is larger than the diameter of its opening. It can be understood that the fixing portion 23 can be fixed in the fixing groove 231 .

[0036] The valve seat pressure plate 12 is fixed to the valve body 1 by bolts 13 . The valve seat pressure plate is provided with screw holes for fixing with the bolts 13 . The valve body 1 is provided with bolt grooves 114 matched with the bolts 13 .

[0037] The valve seat pressure plate 12 has a fixed state in which it is fixedly connected to the valve body 1 and a movable state in which a part of the valve seat pressure plate 12 is rotated to a position away from the valve seat 2 after the bolts 13 are removed. A rotating shaft 112 is provided between the valve seat pressure plate 12 and the valve body 1. The valve seat pressure plate 12 rotates to the outside of the valve seat 2 with the rotating shaft 112 as the center. The rotating shaft 112 is provided at the bottom of the valve seat pressure plate 12. It can be understood that when the sealing component needs to be replaced, the rotating shaft 112 provided on the valve seat pressure plate 12 can easily meet this requirement. The rotating shaft 112 is provided at the bottom of the valve seat pressure plate 12. When the valve seat pressure plate 12 is opened to replace the sealing component, one end of the valve seat pressure plate 12 is located on the valve body 1 and the other end is located on the ground.

[0038] A handle 113 is provided at the middle position of the movable end of the valve seat pressing plate 12. It can be understood that the handle is convenient for rotating the valve seat pressing plate 12 to the ground.

[0039] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A sealed butterfly valve, comprising a valve body (1), a valve seat (2), a butterfly plate (3), a valve stem (4) and a base (5), wherein a flow channel is arranged on the valve body (1), the valve stem (4) is rotatably arranged on the valve body (1) in a direction perpendicular to the flow channel, the valve seat (2) is arranged inside the valve body (1), the butterfly plate (3) is arranged on the valve stem (4) and moves synchronously with the valve stem (4), the butterfly plate (3) and the valve seat (2) are sealed and cooperated to form a closure of the flow channel, and the characteristics are: The sealing butterfly valve also includes a valve seat pressure plate (12) arranged on the outside of the valve body (1), and a sealing component is provided on the valve seat (2), and the sealing component has an elastic abutment portion (21), a limiting portion (22) and a fixing portion (23), and the limiting portion (22) is provided with a limiting protrusion (221), and the outer side surface of the valve body (1), the inner wall of the valve seat pressure plate (12) and the outer side surface of the valve seat (2) together form a cavity for placing the sealing component, and the cavity includes a limiting groove (223) adapted to the limiting protrusion (221), a fixing groove (231) adapted to the fixing portion (23) and an abutment groove, and one end of the elastic abutment portion (21) has an abutment surface (24) abutting against the butterfly plate (3), and the other end abuts against the abutment groove.

2. A sealing butterfly valve according to claim 1, characterized in that: The butterfly plate (3) includes a sealing surface (31) abutting against an elastic abutting portion (21); the abutting groove is formed by a first abutting groove (227) provided on the valve body (1) and a second abutting groove (226) provided on the valve seat pressure plate (12); and the elastic abutting portion (21), the sealing surface (31) and the abutting groove are of the same size as each other.

3. A sealing butterfly valve according to claim 2, characterized in that: A metal frame (211) supporting the elastic abutment portion (21) is provided in the elastic abutment portion (21); the metal frame (211) is respectively arranged between the first abutment groove (227) and the abutment surface (24) and between the second abutment groove (226) and the abutment surface (24).

4. A sealing butterfly valve according to claim 2, characterized in that: The abutting surface (24) on the elastic abutting portion (21) is in a curved shape.

5. A sealing butterfly valve according to claim 1, characterized in that: The cross-sectional length of the abutting surface (24) on the elastic abutting portion (21) is greater than the cross-sectional length of the sealing surface (31).

6. A sealing butterfly valve according to claim 1, characterized in that: The inner diameter of the fixing groove (231) is greater than the diameter of its opening.

7. A sealing butterfly valve according to claim 1, characterized in that: The valve seat pressure plate (12) and the valve body (1) are fixed by bolts (13); the valve seat pressure plate (12) is provided with screw holes for fixing with the bolts (13); and the valve body (1) is provided with bolt grooves (114) adapted to the bolts (13).

8. A sealing butterfly valve according to claim 7, characterized in that: The valve seat pressure plate (12) has a fixed state in which it is fixedly connected to the valve body (1) and an active state in which a portion of the valve seat pressure plate is rotated to a position away from the valve seat (2) after the bolts (13) are removed. A rotating shaft (112) is provided between the valve seat pressure plate (12) and the valve body (1). The valve seat pressure plate (12) rotates outside the valve seat (2) around the rotating shaft (112). The rotating shaft (112) is provided at the bottom of the valve seat pressure plate (12).

9. A sealing butterfly valve according to claim 8, characterized in that: A handle (113) is provided at the middle position of the movable end of the valve seat pressure plate (12).

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