Butterfly valve with self-adaptive adjusting function

Abstract

The utility model relates to the technical field of butterfly valves, provides a butterfly valve with a self-adaptive adjusting function, and solves the problem of local leakage of a sealing surface caused by structural design defects of an existing butterfly valve. The valve comprises a valve body, a through flow channel is arranged in the valve body, and an elastic bag body and a valve plate are arranged in the flow channel. The elastic bag body comprises a pressed part and an arc-shaped attaching part, the pressed part is arranged on one side of the valve plate, the curvature radius of the arc-shaped attaching part is matched with the edge outline of the valve plate, the arc-shaped attaching part is attached and fixed in the circumferential direction of the valve plate, a closed cavity is formed in the elastic bag body, the closed cavity is filled with fluid, and when the flow channel is closed, the fluid flows into the closed cavity. Fluid in the pressed part flows to the arc-shaped attaching part to enable the arc-shaped attaching part to expand, and when the flow channel is opened, the arc-shaped attaching part shrinks and resets; dynamic self-adaptive adjustment of sealing pressure is achieved through the elastic bag body and fluid filling design, and the harsh requirement for machining precision of traditional rigid sealing is eliminated.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a butterfly valve with adaptive adjustment function. Background Technology

[0002] As a crucial component in fluid control, the sealing performance and operational reliability of butterfly valves directly impact system safety. Traditional metal-sealed butterfly valves rely on a precisely machined rigid contact surface between the valve plate and valve body for sealing. For example, Chinese Patent Publication No. CN221665305U discloses a butterfly valve sealing ring and butterfly valve, including a butterfly valve body with a through hole for mounting the valve plate. Both ends of the butterfly valve body have embedding grooves for mounting sealing ring assemblies, with two sets of sealing ring assemblies and embedding grooves facing each other. The sealing ring assembly includes a washer, a rubber ring, a first sealing gasket, a second sealing gasket, and a self-tapping screw. Both the washer and the rubber ring are annular structures. The rubber ring is fixedly glued to the side of the washer away from the butterfly valve body, and the side of the rubber ring away from the washer has mounting holes for installing the self-tapping screw. One end of the self-tapping screw passes through the rubber ring and the washer in sequence and is threaded to both ends of the butterfly valve body, thus utilizing the rotation of the valve plate to open and close the butterfly valve. However, under pressure fluctuation conditions, the metal material is prone to localized leakage at the sealing surface. Utility Model Content

[0003] Therefore, in order to address the above problems, this utility model provides a butterfly valve with adaptive adjustment function, which solves the problem of local leakage at the sealing surface caused by structural design defects in existing butterfly valves.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A butterfly valve with adaptive adjustment function includes a valve body, wherein a through flow channel is provided inside the valve body, and an elastic bladder and a rotating assembly are provided inside the flow channel.

[0006] The rotating assembly includes a valve stem and a valve plate arranged coaxially. The valve stem passes through the valve body and is rigidly connected to the valve plate. The rotation of the valve stem drives the valve plate to open and close the flow channel.

[0007] The elastic bladder includes a pressure-receiving part and an arc-shaped fitting part. The pressure-receiving part is located on one side of the valve plate. The radius of curvature of the arc-shaped fitting part matches the contour of the valve plate edge and is attached and fixed along the circumference of the valve plate. A sealed chamber is formed inside the elastic bladder. The sealed chamber is filled with fluid. When the flow channel is closed, the fluid in the pressure-receiving part flows to the arc-shaped fitting part and expands it. When the flow channel is opened, the arc-shaped fitting part contracts and returns to its original position.

[0008] Furthermore, a sealing ring is provided inside the flow channel, and the sealing ring is attached and fixed along the inner wall of the valve body.

[0009] Furthermore, the pressure-receiving part is circular, the arc-shaped fitting part is semi-circular, the valve plate edge is provided with a groove, and the arc-shaped fitting part is located in the groove.

[0010] Furthermore, a wear-resistant ring is provided along the edge of the groove.

[0011] Furthermore, the radial expansion amount δ of the arc-shaped fitting part in the expanded state satisfies: 2%D≤δ≤6%D, where D is the nominal diameter of the flow channel.

[0012] Furthermore, the elastic capsule also includes a connecting portion, through which the pressure-receiving portion and the arc-shaped fitting portion are connected.

[0013] Furthermore, the valve plate is provided with a connection channel, and the connection part is located in the connection channel.

[0014] Furthermore, the pressure-bearing portion covers the entire side of the valve plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model achieves dynamic adaptive adjustment of sealing pressure through the design of elastic bladder and fluid filling, eliminating the stringent requirements of traditional rigid seals on processing precision.

[0017] 2. This utility model utilizes the pressure transmission mechanism between the pressure-bearing part and the arc-shaped fitting part to automatically increase the pressure at the sealing interface with the medium pressure, effectively solving the leakage problem under high-pressure conditions. Attached Figure Description

[0018] Figure 1 This is a front cross-sectional view of an embodiment of the present utility model;

[0019] Figure 2 This is a side cross-sectional view of an embodiment of the present utility model;

[0020] Figure 3 This is a schematic diagram of the cross-sectional structure of the connection channel in an embodiment of the present utility model.

[0021] Explanation of icon numbers

[0022] Valve body 1; Flow channel 11;

[0023] 2. Elastic capsule; 21. Pressure-bearing part; 22. Arc-shaped fitting part; 23. Connecting part;

[0024] Rotating assembly 3; valve stem 31; valve plate 32; groove 321; wear-resistant ring 322; connecting channel 323;

[0025] Sealing ring 4. Detailed Implementation

[0026] The following will describe the implementation of this utility model in detail with reference to specific embodiments, so that the process of how this utility model uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0027] Example

[0028] like Figures 1 to 3 As shown, a butterfly valve with adaptive adjustment function includes a valve body 1, the valve body 1 having a through flow channel 11 inside, and an elastic bladder 2 and a rotating assembly 3 inside the flow channel 11.

[0029] The rotating assembly 3 includes a valve stem 31 and a valve plate 32 arranged coaxially. The valve stem 31 passes through the valve body 1 and is rigidly connected to the valve plate 32. The rotation of the valve stem 31 drives the valve plate 32 to open and close the flow channel 11.

[0030] The elastic bladder 2 includes a pressure-receiving part 21 and an arc-shaped fitting part 22. The pressure-receiving part 21 is located on one side of the valve plate 32. The radius of curvature of the arc-shaped fitting part 22 matches the edge contour of the valve plate 32 and is attached and fixed along the circumference of the valve plate 32. A sealed chamber is formed inside the elastic bladder 2. The sealed chamber is filled with fluid. When the flow channel 11 is closed, the fluid in the pressure-receiving part 21 flows to the arc-shaped fitting part 22 to expand it. When the flow channel 11 is opened, the arc-shaped fitting part 22 contracts and returns to its original position.

[0031] The dynamic adaptive adjustment of sealing pressure is achieved through the elastic bladder 2 and fluid filling design, eliminating the stringent requirements of machining precision for traditional rigid seals; through the pressure transmission mechanism of the pressure-bearing part 21 and the arc-shaped fitting part 22, the pressure at the sealing interface automatically increases with the medium pressure, effectively solving the leakage problem under high pressure conditions.

[0032] The sealed chamber is filled with a non-Newtonian fluid. The valve plate 32 is also sealed to the valve body 1 through a rigid contact surface. The elastic bladder 2 is designed to provide double protection for the seal. When the valve is closed, the fluid in the flow channel 11 is blocked, which increases the pressure and squeezes the pressure-bearing part 21, causing the fluid in the sealed chamber to move from the pressure-bearing part 21 to the arc-shaped fitting part 22, thus forming an expansion.

[0033] A sealing ring 4 is provided inside the flow channel 11, and the sealing ring 4 is attached and fixed along the inner wall of the valve body 1; the elastic bladder 2 cooperates with the sealing ring 4 to seal, which can prevent wear on the elastic bladder 2 during the opening and closing process.

[0034] The pressure-bearing part 21 is circular, the arc-shaped fitting part 22 is semi-circular, the valve plate 32 has a groove 321 on its edge, and the arc-shaped fitting part 22 is located in the groove 321; the circular pressure-bearing part 21 achieves 360° uniform pressure transmission and avoids stress distortion when under pressure; the recessed installation of the groove 321 fixes the expansion direction of the arc-shaped fitting part 22.

[0035] The groove 321 is provided with a wear-resistant ring 322 along its edge; the wear-resistant ring 322 (such as PTFE material) can reduce the wear rate of the groove 321 edge, and can avoid wear caused by the thinning of the valve plate 32 edge due to the setting of the groove 321, and maintain the structural integrity of the groove 321 under frequent opening and closing conditions.

[0036] The radial expansion amount δ of the arc-shaped fitting part 22 in the expanded state satisfies: 2%D≤δ≤6%D, where D is the nominal diameter of the flow channel 11. The radial expansion amount is adjusted according to the actual butterfly valve size, and this application does not specifically limit it.

[0037] In this embodiment, the elastic capsule 2 further includes a connecting portion 23, through which the pressure-receiving portion 21 and the arc-shaped fitting portion 22 are connected; wherein, the connecting portion 23 is a flat tubular shape.

[0038] In other preferred embodiments, the elastic bladder 2 does not include the connecting portion 23, the pressure-bearing portion 21 covers the entire side of the valve plate 32, and the periphery of the pressure-bearing portion 21 is directly connected to the arc-shaped fitting portion 22.

[0039] The valve plate 32 is provided with a connecting channel 323, and the connecting part 23 is provided in the connecting channel 323. The connecting channel 323 is provided on the surface of the valve plate 32 for fixing the connecting part 23.

[0040] Although the present invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the present invention without departing from the spirit and scope of the present invention as defined in the appended claims, and all such changes shall be within the scope of protection of the present invention.

Claims

1. A butterfly valve with adaptive adjustment function, comprising a valve body, wherein the valve body has a through flow channel inside, characterized in that: The flow channel is equipped with an elastic bladder and a rotating assembly; The rotating assembly includes a valve stem and a valve plate arranged coaxially. The valve stem passes through the valve body and is rigidly connected to the valve plate. The rotation of the valve stem drives the valve plate to open and close the flow channel. The elastic bladder includes a pressure-receiving part and an arc-shaped fitting part. The pressure-receiving part is located on one side of the valve plate. The radius of curvature of the arc-shaped fitting part matches the contour of the valve plate edge and is attached and fixed along the circumference of the valve plate. A sealed chamber is formed inside the elastic bladder. The sealed chamber is filled with fluid. When the flow channel is closed, the fluid in the pressure-receiving part flows to the arc-shaped fitting part and expands it. When the flow channel is opened, the arc-shaped fitting part contracts and returns to its original position.

2. The butterfly valve with adaptive adjustment function according to claim 1, characterized in that: A sealing ring is provided inside the flow channel, and the sealing ring is attached and fixed along the inner wall of the valve body.

3. A butterfly valve with adaptive adjustment function according to claim 1, characterized in that: The pressure-receiving part is circular, the arc-shaped fitting part is semi-circular, the valve plate edge is provided with a groove, and the arc-shaped fitting part is located in the groove.

4. A butterfly valve with adaptive adjustment function according to claim 3, characterized in that: The groove edge is provided with a wear-resistant ring.

5. A butterfly valve with adaptive adjustment function according to claim 1, characterized in that: The radial expansion δ of the arc-shaped fitting part in the expanded state satisfies: 2%D≤δ≤6%D, where D is the nominal diameter of the flow channel.

6. A butterfly valve with adaptive adjustment function according to claim 1, characterized in that: The elastic capsule further includes a connecting portion, and the pressure-receiving portion and the arc-shaped fitting portion are connected through the connecting portion.

7. A butterfly valve with adaptive adjustment function according to claim 6, characterized in that: The valve plate is provided with a connection channel, and the connection part is located in the connection channel.

8. A butterfly valve with adaptive adjustment function according to claim 1, characterized in that: The pressure-bearing part covers the entire side of the valve plate.

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