Valve plate sealing assembly of flange butterfly valve

Abstract

The utility model discloses a valve plate sealing assembly of a flange butterfly valve, which comprises a valve plate mounted in a valve body through a valve rod in a running fit manner, and the valve plate is in sealing fit with a valve seat in the valve body; a flexible sealing ring close to the edge of a plate body is coaxially arranged on the plate face of the valve plate, and the flexible sealing ring can expand and shrink to deform. When the valve plate rotates to the valve opening position, the flexible sealing ring is shrunk and is retracted into the range defined by the edge contour of the valve plate; and when the valve plate rotates to a valve closing position, the flexible sealing ring expands and expands outwards to be tightly attached to the valve seat, so that the valve plate and the flexible sealing ring form an axial double-sealing structure. The flexible sealing ring is coaxially arranged on the valve plate, and the flexible sealing ring can expand outwards to form an axial double-sealing structure with the valve plate in a valve closing state, so that the sealing performance is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to flange butterfly valve technical field especially relates to a valve plate sealing assembly of flange butterfly valve. BACKGROUND

[0002] The valve plate of flange butterfly valve can realize the control of opening and closing valve and the flow control under the condition of opening valve through the rotation between 0~90 DEG, is suitable for conveying fluid medium, and is more widely used in the field of industrial production. In order to be suitable for conveying environment with temperature and pressure requirements, the valve plate of the existing flange butterfly valve is generally made of metal material, and the sealing performance of the valve plate and the valve seat cooperation sealing will appear performance decline under the condition of long time use friction, resulting in leakage or inaccurate flow control. SUMMARY

[0003] The utility model discloses a valve plate sealing assembly of flange butterfly valve, which is characterized by coaxially arranging a flexible sealing ring on the valve plate, expanding the flexible sealing ring to form an axial double-sealing structure with the valve plate in the closed valve state, thereby improving the sealing performance.

[0004] Technical scheme: in order to realize the above-mentioned purpose, the utility model discloses a valve plate sealing assembly of flange butterfly valve, which comprises a valve plate installed in the valve body through the rotation cooperation of valve rod, and the inlet and outlet of the valve body are provided with flange plates, and the valve plate is sealingly connected with the valve seat in the valve body.

[0005] The plate surface of the valve plate is coaxially provided with a flexible sealing ring close to the edge of the plate body, and the flexible sealing ring can expand and shrink.

[0006] When the valve plate rotates to the open valve position, the flexible sealing ring shrinks to be inlaid in the edge profile of the valve plate.

[0007] When the valve plate rotates to the closed valve position, the flexible sealing ring expands to tightly contact the valve seat, so that the valve plate and the flexible sealing ring form an axial double-sealing structure.

[0008] Further, the flexible sealing ring is arranged on the back surface of the valve plate, and the flexible sealing ring is a hollow flexible body structure; a through hole parallel to the axis of the valve plate is formed in the valve plate, and the flexible sealing ring on the back surface of the valve plate is connected with the front surface area of the valve plate through the through hole.

[0009] When the valve plate rotates to the closed valve position, the fluid medium in the front surface area of the valve plate enters the flexible sealing ring through the through hole, so that the flexible sealing ring expands and deforms by filling the fluid medium.

[0010] Further, the flexible sealing ring has an interface on the side facing the valve plate, and the interface is in one-to-one correspondence with the through hole.

[0011] Further, a baffle is coaxially arranged on the back surface of the valve plate, and an annular cavity is formed between the baffle and the valve plate, and the flexible sealing ring is arranged in the annular cavity; when the flexible sealing ring is deformed, the flexible sealing ring is extended and guided through the annular cavity, so that the flexible sealing ring is expanded or shrunk in the radial direction.

[0012] Further, the flexible sealing ring is a hollow annular rubber sealing ring.

[0013] Further, the back surface of the valve plate is connected with a mounting member, and the baffle is fixedly connected with the valve plate through the mounting member.

[0014] Beneficial effects: the flexible sealing ring is coaxially arranged on the valve plate, the flexible sealing ring is expanded and outwardly extended to form an axial double sealing structure with the valve plate in the closed valve state, so that the sealing performance is improved, leakage is avoided, and the accuracy of flow control is ensured, and the flexible sealing ring 5 is shrunk and inwardly retracted in the closed valve state, so that the flow resistance of fluid medium conveying is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 Fig. 1 is a structural schematic view of a valve plate, a valve body, a valve plate and a flexible sealing ring;

[0016] Figure 2 Fig. 2 is a half-section structural schematic view of the valve plate, the valve body, the valve plate and the flexible sealing ring; Figure 1

[0017] Fig. 3 is an enlarged structural schematic view of area A of the flexible sealing ring. Figure 3 Specific implementation Figure 2 The utility model will be further described below in combination with the drawings.

[0018] The utility model will be further described below in combination with the drawings.

[0019] As Figure 1 , Figure 2 and Figure 3 ​As shown, a valve plate sealing assembly of a flange butterfly valve includes a valve plate 3 that is rotatably mounted in a valve body 2 via a valve stem 1. The inlet and outlet of the valve body 2 are provided with flanges, and the valve plate 3 is sealed with a valve seat 4 in the valve body 2. A flexible sealing ring 5 is coaxially provided on the surface of the valve plate 3 near the edge of the plate body, and the flexible sealing ring 5 can expand and contract. When the valve plate 3 rotates to the valve-open position, the flexible sealing ring 5 contracts and retracts inwardly within the range enclosed by the edge contour of the valve plate 3. When the valve plate 3 rotates to the valve-closed position, the flexible sealing ring 5 expands and expands outwardly to tightly fit the valve seat 4, so that the valve plate 3 and the flexible sealing ring 5 form an axial double sealing structure. The utility model provides a flexible sealing ring 5 coaxially on the valve plate 3. In the valve-closed state, the flexible sealing ring 5 can expand and expand outwardly to form an axial double sealing structure with the valve plate 3, thereby improving the sealing performance, avoiding leakage, and ensuring the accuracy of flow control. In addition, in the valve-closed state, the flexible sealing ring 5 can contract and retract, reducing the flow resistance effect on the fluid medium transmission.

[0020] More specifically, Figure 2 As shown, the flexible sealing ring 5 is arranged on the back of the valve plate 3, and the flexible sealing ring 5 is a hollow flexible body structure; the valve plate 3 is provided with a through hole 30 parallel to the axis of the valve plate 3, and the flexible sealing ring 5 on the back of the valve plate 3 is connected to the front area of ​​the valve plate 3 through the through hole 30; when the valve plate 3 rotates to the valve closing position, the fluid medium located in the front area of ​​the valve plate 3 enters the flexible sealing ring 5 through the through hole 30, causing the flexible sealing ring 5 to expand and deform due to the entry of the fluid medium. In the valve closing state, the front area of ​​the valve plate 3 is in a positive pressure state due to the presence of the fluid medium. Based on the positive pressure working condition, the fluid medium is filled into the flexible sealing ring 5 through the through hole 30, causing the flexible sealing ring 5 to expand and deform until it fits the valve seat 4, thereby achieving sealing. The expansion and deformation of the flexible sealing ring 5 adopts the positive pressure fluid environment of the front area of ​​the valve plate 3, without the need for an additional power mechanism, and has a simpler structure and lower cost.

[0021] like Figure 3 As shown, the flexible sealing ring 5 has an interface 50 on the side facing the valve plate 3 , and the interface 50 is connected to the through hole 30 in a one-to-one correspondence.

[0022] The present invention also includes a baffle 6 coaxially arranged on the back side of the valve plate 3, and the baffle 6 and the valve plate 3 are limited to form an annular cavity 7 with an opening on the outside, and the flexible sealing ring 5 is located in the annular cavity 7; when the flexible sealing ring 5 undergoes structural deformation, the deformation and extension are guided by the annular cavity 7, so that the flexible sealing ring 5 expands or contracts in the radial direction, thereby meeting the requirement that the flexible sealing ring 5 can fit the valve seat 4 when expanded.

[0023] In the present invention, as a preference, the flexible sealing ring 5 is a hollow annular rubber sealing ring.

[0024] As Figure 3 shown, the back surface of the valve plate 3 is hingedly connected with a mounting member 8, and the baffle plate 6 is fixedly connected relative to the valve plate 3 through the mounting member 8, and the mounting member 8 is preferably a screw.

[0025] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered within the scope of the present application.

Claims

1. A valve plate sealing assembly for a flange butterfly valve, comprising a valve plate (3) rotatably mounted in a valve body (2) via a valve stem (1), wherein flanges are provided at the inlet and outlet of the valve body (2), and the valve plate (3) is in sealing engagement with a valve seat (4) in the valve body (2); Its characteristics are: The plate surface of the valve plate (3) is coaxially provided with a flexible sealing ring (5) close to the edge of the plate body, and the flexible sealing ring (5) can expand and contract. When the valve plate (3) rotates to the valve-opening position, the flexible sealing ring (5) shrinks and retracts into the range enclosed by the edge contour of the valve plate (3); When the valve plate (3) rotates to the valve closing position, the flexible sealing ring (5) expands and expands outwards to fit tightly against the valve seat (4), so that the valve plate (3) and the flexible sealing ring (5) form an axial double sealing structure.

2. The valve plate sealing assembly of a flange butterfly valve according to claim 1, characterized in that: The flexible sealing ring (5) is arranged on the back of the valve plate (3), and the flexible sealing ring (5) is a hollow flexible body structure; a through hole (30) parallel to the axis of the valve plate (3) is opened on the valve plate (3), and the flexible sealing ring (5) on the back of the valve plate (3) is connected to the front area of ​​the valve plate (3) through the through hole (30); When the valve plate (3) rotates to the valve closing position, the fluid medium located in the front area of ​​the valve plate (3) enters the flexible sealing ring (5) through the through hole (30), causing the flexible sealing ring (5) to expand and deform due to the entry of the fluid medium.

3. The valve plate sealing assembly of a flange butterfly valve according to claim 2, characterized in that: The flexible sealing ring (5) has an interface (50) on the side facing the valve plate (3), and the interface (50) is connected to the through hole (30) in a one-to-one correspondence.

4. The valve plate sealing assembly of a flange butterfly valve according to claim 2, characterized in that: The invention also includes a baffle (6) coaxially arranged on the back side of the valve plate (3), wherein the baffle (6) and the valve plate (3) are limited to form an annular cavity (7) with an opening on the outside, and the flexible sealing ring (5) is located in the annular cavity (7); when the flexible sealing ring (5) undergoes structural deformation, the deformation extension is guided by the annular cavity (7) so that the flexible sealing ring (5) expands or contracts in the radial direction.

5. The valve plate sealing assembly of a flange butterfly valve according to claim 4, characterized in that: The flexible sealing ring (5) is a hollow annular rubber sealing ring.

6. The valve plate sealing assembly of a flange butterfly valve according to claim 4, characterized in that: The back side of the valve plate (3) is movably connected with a mounting member (8), and the baffle (6) is fixedly connected to the valve plate (3) via the mounting member (8).

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