Butterfly valve

Abstract

The utility model relates to the technical field of sealing valves, and provides a butterfly valve which comprises a valve body, a valve plate, a valve rod, a driving swing arm and a connecting rod, a medium channel is arranged on the valve body, one end of the driving swing arm is hinged to the valve body, and the other end of the driving swing arm is hinged to the valve plate. The driving swing arm and the connecting rod are located on the two sides of the valve plate respectively, the driving swing arm can swing towards one side of the sealing face and then push the valve plate to enable the valve plate to be separated from the sealing face, the valve plate horizontally moves to leave the sealing face at the moment of opening, and excessive friction between the valve plate and the sealing face is avoided. Or the swing arm can swing towards one side far away from the sealing surface to enable the valve plate to tightly press the sealing surface. The technical problem that in the prior art, a sealing strip is prone to being damaged due to frequent friction when the butterfly valve is opened and closed is solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to the field of sealing valve technology, specifically to a butterfly valve. Background Technology

[0002] In existing butterfly valves, frequent opening and closing operations lead to high-frequency friction between the valve plate and the sealing strip. With the cumulative effect of these opening and closing cycles, the microstructure of the sealing strip surface is gradually damaged, and the material's physical properties decline. Initially, this may appear as minor wear marks, but over time, the wear intensifies, causing the sealing strip to gradually lose its elasticity and sealing performance, ultimately leading to seal failure. Furthermore, in situations requiring the transport of corrosive media, such as the strong acids or alkalis commonly found in chemical production, and sulfur-containing media in petroleum processing, even if the sealing strip is made of relatively corrosion-resistant material, its surface will undergo chemical reactions under the combined effects of long-term erosion and chemical corrosion, gradually dissolving or deteriorating the material. The sealing effect will also be significantly reduced as corrosion deepens, eventually leading to media leakage. This not only causes material loss, but leaks of flammable, explosive, toxic, or harmful media can also potentially trigger major safety accidents such as fires, explosions, and poisoning, posing a significant threat to human life and the surrounding environment. Utility Model Content

[0003] To overcome the above-mentioned defects, embodiments of this utility model provide a butterfly valve, which solves the technical problem in the prior art where frequent friction of the sealing strip during valve opening and closing causes easy damage to the sealing strip; according to one aspect, at least one embodiment of this utility model provides a butterfly valve, comprising:

[0004] The valve body has a medium channel inside for connecting adjacent pipes, and the inner wall of the medium channel has a sealing surface.

[0005] A valve plate, located in the middle of the valve body, is used to control the flow of fluid.

[0006] An active swing arm, one end of which is hinged to the valve body and the other end of which is hinged to the valve plate;

[0007] A connecting rod, one end of which is hinged to the valve body and the other end of which is hinged to the valve plate, the active swing arm and the connecting rod are respectively located on both sides of the valve plate, and the sealing surface faces the connecting rod. The active swing arm can swing towards the side closer to the sealing surface and push the valve plate to make the valve plate disengage from the sealing surface, or the active swing arm can swing away from the sealing surface and make the valve plate press against the sealing surface.

[0008] For example, in at least one embodiment of the butterfly valve provided by this utility model, it further includes:

[0009] The valve stem has one end that can pass through the hinge point between the active swing arm and the valve body and be rotatably mounted on the valve body, and the other end that passes through the valve body and is located outside the valve body. The valve stem can rotate to drive the active swing arm to rotate.

[0010] For example, in a butterfly valve provided by at least one embodiment of the present invention, the valve plate includes a first arc-shaped panel body that abuts against the sealing surface and a second arc-shaped panel body that is connected to the first arc-shaped panel body, wherein the apex of the first arc-shaped panel body and the apex of the second arc-shaped panel body face the active swing arm and the connecting rod, respectively.

[0011] For example, in a butterfly valve provided in at least one embodiment of the present invention, the sealing surface faces the inlet of the valve body, so that when the valve plate presses against the sealing surface, the fluid entering the medium channel through the inlet presses the valve plate against the sealing surface.

[0012] For example, in a butterfly valve provided in at least one embodiment of the present invention, a sealing ring is provided on the sealing surface, and the valve plate can achieve sealing by pressing the sealing ring against the valve body.

[0013] For example, in a butterfly valve provided in at least one embodiment of the present invention, the valve plate has a protrusion on the side facing away from the inlet, and the protrusion can abut against the end face of the valve plate after the valve plate is separated from the sealing surface.

[0014] For example, in a butterfly valve provided in at least one embodiment of the present invention, a sealing packing is provided between the valve stem and the valve body assembly gap, and a packing gland is provided at the outer end of the assembly gap.

[0015] For example, in a butterfly valve provided in at least one embodiment of the present invention, a drain port is provided at the lower end of the valve body, and a drain port cover is provided on the drain port.

[0016] For example, in a butterfly valve provided in at least one embodiment of the present invention, bearing housings are provided at both ends of the valve body, bearings are installed in the bearing housings, and the valve body is assembled and connected to the valve stem through the bearings.

[0017] For example, in a butterfly valve provided in at least one embodiment of this utility model, the connection between the valve stem and the active rocker arm is a key connection.

[0018] The beneficial effects of the embodiments of this utility model are as follows:

[0019] In this invention, the valve plate and connecting rod can be moved by an active swing arm, so that the valve plate moves parallel to the sealing surface and then rotates to a 90-degree fully open state at the moment of opening. There is no friction between the sealing surface and the valve plate, which protects the sealing ring. After the valve is closed, the valve plate uses the medium pressure to fit the entire circle against the valve body sealing surface, resulting in excellent sealing performance. This design can achieve a hard seal without the need for a sealing ring, maintain stable sealing performance, and avoid the problem of sealing ring aging and deformation under high temperature or corrosive conditions, which can lead to a decrease in sealing performance. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a butterfly valve in one embodiment of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure of a butterfly valve after it is opened in one embodiment;

[0023] In the diagram: 1. Valve body, 2. Valve plate, 3. Valve stem, 4. Active rocker arm, 5. Connecting rod, 6. Sealing ring, 7. Sealing packing, 8. Packing gland, 9. Bearing box, 10. Bearing, 11. Drain port, 12. Drain port cover, 201. Protrusion, 101. Medium passage, 102. Sealing surface, 103. Inlet, 202. First arc panel body, 203. Second arc panel body. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0025] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0026] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] like Figures 1-2 As shown, this is a butterfly valve according to one embodiment of the present invention. When the valve stem 3 drives the active swing arm 4 to swing towards the sealing surface 102, the valve plate 2 rotates eccentrically around the hinge point between the connecting rod 5 and the valve body 1. At this time, the first arc panel 202 of the valve plate 2 first moves away from the sealing surface 102, avoiding the sliding friction during the opening of a traditional butterfly valve and significantly reducing the wear of the sealing ring 6. When the valve plate 2 approaches the closed position, the medium pressure acts on the second arc panel 203, generating additional sealing force, thereby achieving a seal by hard sealing without the need for a sealing ring 6 on the valve body 1.

[0031] like Figures 1-2The butterfly valve shown in one embodiment of this utility model mainly consists of a valve body 1, a valve plate 2, an active rocker arm 4, a connecting rod 5, and a valve stem 3. A cylindrical medium channel 101 is formed inside the valve body 1. An annular sealing surface 102 is machined on the inner wall of the medium channel 101, facing the valve body inlet 103, and is inlaid with a sealing ring 6. The valve plate 2 adopts a double-arc surface structure design. The first arc plate 202 matches the sealing surface 102, and the second arc plate 203 is connected to the back side of the first arc plate 202, with its two vertices facing the active rocker arm 4 and the connecting rod 5, respectively. One end of the active rocker arm 4 is fixed to the valve stem 3, and the other end is hinged to the valve plate 2 via a hinge support. One end of the connecting rod 5 is hinged to the bottom support of the valve body 1, and the other end is hinged to the lower side of the valve plate 2. The valve stem 3 can be externally connected to a drive device. The drive device drives the valve stem 3 to rotate 90°, causing the active swing arm 4 to swing towards the sealing surface 102. At the moment the active swing arm 4 moves, the valve plate 2 moves away from the sealing surface 102 in parallel, and there is no friction between the valve plate 2 and the sealing surface 102. The active swing arm 4 pushes the valve plate 2 to rotate around the hinge point, causing the first arc panel 202 to separate from the sealing surface 102 until the protrusion 201 contacts the second arc panel 203. At this time, the medium passage 101 is completely unobstructed, and the fluid resistance is small. The drive device drives the valve stem 3 to rotate 90° in the opposite direction, and the active swing arm 4 pulls the valve plate 2 to rotate in the opposite direction, and the first arc panel 202 gradually presses the sealing ring 6. When the fluid enters from the inlet 103, the pressure acts on the second arc panel 203 of the valve plate 2, increasing the sealing pressure. The active swing arm 4 is set in an arc shape, which can make way for the sealing surface 102 of the valve body 1.

[0032] The streamlined shape of valve plate 2 effectively reduces the resistance of the medium during passage, significantly improving flow efficiency. When the butterfly valve is open, the double-arc structure of valve plate 2 (first arc plate 202 and second arc plate 203) forms a smooth transition channel with the inner wall of the medium channel 101, ensuring a continuous and smooth medium flow path and preventing eddies and turbulence caused by sudden cross-sectional changes or sharp edges. This design significantly reduces collisions and friction between the medium and the surface of valve plate 2, reducing pressure loss and energy consumption. Simultaneously, the streamlined shape guides the medium to pass through the valve evenly and stably, reducing vibration and noise caused by uneven flow rates, effectively reducing valve wear, and extending equipment lifespan. It is particularly suitable for high-flow-rate applications, ensuring efficient and smooth medium flow. A sealing packing is installed between valve stem 3 and valve body 1. The sealing packing is pressed tightly by packing gland 8, preventing medium leakage and resisting external contamination. It prevents external dust and moisture from entering the gap between valve stem 3 and valve body 1, avoiding wear of the packing layer and extending the lifespan of the sealing system.

[0033] The drain port 11 is located at the lower end of the valve body 1 and is mainly used to drain impurities, condensate, or residual media deposited in the medium passage 101. In practical applications, mud, rust, solid particles carried by the fluid, or residual liquid after medium transportation, may accumulate at the bottom of the valve body 1. This can not only affect the normal opening and closing of the valve plate 2 and increase wear, but may also breed bacteria and corrode the valve body 1. The existence of the drain port 11 provides a discharge channel for impurities and accumulated liquid, preventing them from affecting the valve performance and service life.

[0034] The drain cover 12 serves a sealing and protective function. During normal valve operation, the drain cover 12 tightly seals the drain port 11 to prevent media leakage, ensure stable system pressure, and avoid media leakage that could lead to safety risks or environmental pollution. When cleaning and draining are required, the drain cover 12 can be opened to perform the draining operation. After completion, the cover should be tightened again to ensure the sealing of the drain port 11, allowing the valve to return to normal operation.

[0035] The bearing 10 is installed inside the bearing housing 9. As the core support component for the rotation of the valve stem 3, it minimizes the frictional torque generated when the valve stem 3 rotates, effectively reducing rotational resistance and ensuring smooth and stable rotation of the valve stem 3 during the process of driving the active rocker arm 4 to open and close the valve plate 2. At the same time, the bearing 10 has good load-bearing capacity and can withstand the axial and radial loads transmitted by the valve stem 3, preventing the valve stem 3 from shaking due to uneven force distribution and ensuring valve control accuracy.

[0036] The bearing housing 9 provides a stable installation space and reliable protection for the bearing 10. It is welded or fixed to both ends of the valve body 1, isolating the bearing 10 from the external environment and preventing dust, moisture, corrosive media, etc., from entering the bearing 10. This avoids accelerated wear or corrosion of the bearing 10 due to external impurities, thereby extending the service life of the bearing 10 and ensuring long-term stable operation of the valve. Furthermore, the bearing housing 9 also provides lubrication space for the bearing 10, facilitating the injection of lubricating oil or grease, further improving the lubrication effect and working performance of the bearing 10, allowing the butterfly valve to maintain efficient and reliable operation even under frequent operation.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A butterfly valve, characterized in that, include: The valve body (1) has a medium channel (101) inside for connecting adjacent pipes, and the inner wall of the medium channel (101) has a sealing surface (102). Valve plate (2), which is disposed in the middle of the valve body (1), is used to control the flow of fluid. Active swing arm (4), one end of which is hinged to the valve body (1) and the other end is hinged to the valve plate (2); A connecting rod (5) is hinged at one end to the valve body (1) and at the other end to the valve plate (2). The active swing arm (4) and the connecting rod (5) are located on both sides of the valve plate (2), and the sealing surface (102) faces the connecting rod (5). The active swing arm (4) can swing towards the side closer to the sealing surface (102) and push the valve plate (2) to make the valve plate (2) separate from the sealing surface (102), or the active swing arm (4) can swing away from the sealing surface (102) and make the valve plate (2) press against the sealing surface (102).

2. A butterfly valve according to claim 1, characterized in that, Also includes: The valve stem (3) has one end that can pass through the hinge point between the active swing arm (4) and the valve body (1) and be rotatably mounted on the valve body (1), and the other end that passes through the valve body (1) and is located outside the valve body (1). The valve stem (3) can rotate and drive the active swing arm (4) to rotate.

3. A butterfly valve according to claim 1, characterized in that, The valve plate (2) includes a first arc plate body (202) that abuts against the sealing surface (102) and a second arc plate body (203) that is connected to the first arc plate body (202). The apex of the first arc plate body (202) and the apex of the second arc plate body (203) are respectively facing the active swing arm (4) and the connecting rod (5).

4. A butterfly valve according to claim 1, characterized in that, The sealing surface (102) faces the inlet (103) of the valve body (1) so that when the valve plate (2) presses against the sealing surface (102), the fluid entering the medium channel (101) through the inlet (103) presses the valve plate (2) against the sealing surface (102).

5. A butterfly valve according to claim 1, characterized in that, A sealing ring (6) is provided on the sealing surface (102), and the valve plate (2) can achieve sealing by pressing the sealing ring (6) against the valve body (1).

6. A butterfly valve according to claim 4, characterized in that, The valve plate (2) has a protrusion (201) on the side facing away from the inlet (103), and the protrusion (201) can abut against the end face of the valve plate (2) after the valve plate (2) is separated from the sealing surface (102).

7. A butterfly valve according to claim 2, characterized in that, A sealing filler (7) is provided between the valve stem (3) and the valve body (1) assembly gap, and a filler cap (8) is provided at the outer end of the assembly gap.

8. A butterfly valve according to claim 1, characterized in that, The valve body (1) is provided with a drain port (11) at the lower end, and a drain port cover (12) is provided on the drain port (11).

9. A butterfly valve according to claim 1, characterized in that, The valve body (1) is provided with bearing boxes (9) at both ends, and bearings (10) are installed in the bearing boxes (9). The valve body (1) is assembled and connected to the valve stem (3) through the bearings (10).

10. A butterfly valve according to claim 2, characterized in that, The valve stem (3) and the active swing arm (4) are connected by a key.

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