Butterfly valve

Abstract

This utility model belongs to the field of valve technology, and specifically relates to a butterfly valve, which includes a valve body, a butterfly plate, a valve stem, a linkage mechanism, and a drive mechanism. The valve body has a flow channel, and the axis of the valve stem is offset relative to the central axis of the butterfly plate. The linkage mechanism has an input end and an output end connected to the valve stem, and the input end is offset relative to the output end. The drive mechanism is connected to the input end. Offsetting the valve stem relative to the centerline of the butterfly plate allows the butterfly plate to make point contact with the flow channel during opening and closing, thereby reducing wear between the flow channel and the butterfly plate and improving the service life of the butterfly valve. Furthermore, under the action of the linkage mechanism, the drive mechanism is offset relative to the output end, that is, relative to the valve stem. This setting ensures that the driving force of the drive mechanism is smoothly transmitted to the valve stem, avoiding additional torque imbalance caused by the valve stem offset, thereby reducing local wear between the flow channel and the butterfly plate and further improving the service life of the butterfly valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a butterfly valve. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve widely used in various industrial and engineering fields. It offers advantages such as fast opening and closing speed, simple structure, small size, light weight, and low fluid resistance. Butterfly valves can be used to control the flow of fluids such as air, water, steam, corrosive media, liquid metals, and radioactive media.

[0003] Currently, butterfly valves consist of a valve body, a butterfly plate, a valve stem, and a rotary motor. The butterfly plate is located inside the flow channel of the valve body, and the valve stem is fixedly connected to the butterfly plate. The rotary motor drives the butterfly plate to rotate, controlling the opening and closing of the valve. The valve stem's deflection angle controls the flow rate of the medium. However, currently, the valve stem is often placed at the center line of the butterfly plate. During opening and closing, the butterfly plate slides in line with the flow channel, which easily accelerates wear between the butterfly plate and the flow channel, thus reducing the overall service life of the butterfly valve.

[0004] Therefore, the above problems urgently need to be solved. Utility Model Content

[0005] The purpose of this invention is to provide a butterfly valve that reduces wear between the butterfly plate and the flow channel, thereby increasing the service life of the butterfly valve.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Butterfly valves, which include:

[0008] The valve body has a flow channel;

[0009] A butterfly plate is disposed inside the flow channel and is used to block or open the flow channel;

[0010] A valve stem is fixedly connected to the butterfly plate, and the axis of the valve stem is offset relative to the central axis of the butterfly plate, with one end of the valve stem penetrating the valve body;

[0011] A sealing ring is provided between the valve body and the valve stem for sealing.

[0012] A linkage mechanism having an input end and an output end connected to the valve stem, wherein the input end is offset relative to the output end;

[0013] A drive mechanism is connected to the input end and is used to drive the valve stem to rotate about its own axis.

[0014] Preferably, the linkage mechanism includes a crankshaft, a connecting shaft, and a rocker shaft that are hinged sequentially.

[0015] The drive mechanism is a rotary motor, the rotating shaft of which is fixedly connected to the crankshaft, and the rocker shaft is fixedly connected to the valve stem.

[0016] Preferably, the linkage mechanism has a first dead point position and a second dead point position. When the linkage mechanism is in the first dead point position, the flow channel is in a blocked state; when the linkage mechanism switches from the first dead point position to the second dead point position, the flow channel is in an open state.

[0017] Preferably, the connecting shaft is arc-shaped, with the inner arc of the connecting shaft facing the valve stem.

[0018] Preferably, the valve stem has a connecting end at the end opposite to the butterfly plate, and the connecting end is polygonal.

[0019] Preferably, the valve stem has a columnar connecting end at the end opposite to the butterfly plate, and the outer peripheral wall of the connecting end has a cross-section.

[0020] Preferably, a sealing ring is provided between the valve body and the valve stem, and the sealing ring is made of a flexible material.

[0021] Preferably, the flexible material is rubber.

[0022] Preferably, the outer periphery of the butterfly plate has an annular conical surface, which is adapted to seal the inner sidewall of the flow channel.

[0023] The beneficial effects of this utility model are:

[0024] The butterfly valve of this invention has its valve stem offset relative to the centerline of the butterfly plate. This allows the butterfly plate to make point contact with the flow channel during opening and closing, thereby reducing wear between the flow channel and the butterfly plate and improving the service life of the butterfly valve. Furthermore, under the action of the linkage mechanism, the drive mechanism is offset relative to the output end, that is, offset relative to the valve stem. This setting ensures that the driving force of the drive mechanism is smoothly transmitted to the valve stem, avoiding additional torque imbalance caused by the valve stem offset. This reduces local wear between the flow channel and the butterfly plate, further improving the service life of the butterfly valve. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the butterfly valve in an embodiment of this utility model;

[0026] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 3 This is a schematic diagram of the structure in which the flow channel is in a blocked state in an embodiment of this utility model;

[0028] Figure 4 This is a schematic diagram of the flow channel in the open state in an embodiment of this utility model.

[0029] In the picture:

[0030] 1. Valve body; 11. Flow channel;

[0031] 2. Butterfly plate; 3. Valve stem; 4. Sealing ring;

[0032] 5. Linkage mechanism; 51. Crankshaft; 52. Connecting shaft; 53. Rocker shaft;

[0033] 6. Drive mechanism;

[0034] 7. Connecting end; 71. Cut surface. Detailed Implementation

[0035] 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 it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0037] 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.

[0038] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not 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. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] Please see Figures 1 to 4 This embodiment proposes a butterfly valve, which includes a valve body 1, a butterfly plate 2, a valve stem 3, a linkage mechanism 5, and a drive mechanism 6. The valve body 1 has a flow channel 11; the butterfly plate 2 is disposed inside the flow channel 11 and is used to block or open the flow channel 11; the valve stem 3 is fixedly connected to the butterfly plate 2, and the axis of the valve stem 3 is offset relative to the central axis of the butterfly plate 2, and one end of the valve stem 3 passes through the valve body 1; the linkage mechanism 5 has an input end and an output end connected to the valve stem 3, and the input end is offset relative to the output end; the drive mechanism 6 is connected to the input end and is used to drive the valve stem 3 to rotate around its own axis.

[0040] It is understandable that offsetting the valve stem 3 relative to the centerline of the butterfly plate 2 allows the butterfly plate 2 to make point contact with the flow channel 11 during opening and closing, thereby reducing wear between the flow channel 11 and the butterfly plate 2 and improving the service life of the butterfly valve. Furthermore, under the action of the linkage mechanism 5, the drive mechanism 6 can be offset relative to the output end, that is, offset relative to the valve stem 3. This setting ensures that the driving force of the drive mechanism 6 is smoothly transmitted to the valve stem 3, avoiding additional torque imbalance caused by the offset of the valve stem 3, thereby reducing local wear between the flow channel 11 and the butterfly plate 2 and further improving the service life of the butterfly valve.

[0041] In this embodiment, the linkage mechanism 5 includes a crankshaft 51, a connecting shaft 52, and a rocker shaft 53 that are sequentially hinged; the drive mechanism 6 is a rotary motor, the rotating shaft of which is fixedly connected to the crankshaft 51, and the rocker shaft 53 is fixedly connected to the valve stem 3. It can be understood that the bracket of the rotary motor and the valve body 1 can form a fixed bracket for the linkage mechanism 5. Under the action of the rotary motor, one end of the crankshaft 51 can rotate around the rotating shaft of the rotary electrolyzer. Under the action of the connecting shaft 52, the rocker shaft 53 can be driven to swing, thereby driving the butterfly plate 2 to rotate and controlling the rotation angle of the butterfly plate 2, thus facilitating the control of the medium flow rate.

[0042] Furthermore, the linkage mechanism 5 has a first dead point position and a second dead point position. When the linkage mechanism 5 is in the first dead point position, the flow channel 11 is in a blocked state; when the linkage mechanism 5 switches from the first dead point position to the second dead point position, the flow channel 11 is in an open state. It can be understood that, as a crank-rocker mechanism, when the crank shaft 51 and the connecting shaft 52 are in a collinear position, the linkage mechanism 5 is in a dead point position. At this time, if the rotating motor stops rotating, the entire linkage mechanism 5 is in a locked state, and the pressure or vibration of the medium in the flow channel 11 cannot drive the butterfly plate 2 to rotate, thereby achieving zero-power self-locking and preventing the butterfly plate 2 from rotating when it is in the two extreme positions.

[0043] Furthermore, when the linkage mechanism 5 is in the first dead point position, the crankshaft 51 and the connecting shaft 52 are collinear, and the theoretical lever arm is zero. Therefore, during the transition of the linkage mechanism 5 from the first dead point position to the second dead point position, the rotary motor only needs to overcome the static friction in the connecting mechanism. Compared to directly connecting the rotary motor to the valve stem 3, this arrangement reduces the load on the rotary motor and further improves the service life of the butterfly valve. During the rotation of the linkage mechanism 5 to the second dead point position, the angular velocity of the rocker shaft 53 approaches zero, that is, the angular velocity of the butterfly plate 2 approaches zero. To ensure the power balance inside the butterfly valve, the output torque requirement of the rotary motor is correspondingly reduced. In other words, the locking of the butterfly plate 2 can be completed with extremely low output torque of the rotary motor. Therefore, when selecting a rotary motor, it is not necessary to select a motor with high output torque, thus reducing production costs.

[0044] In this embodiment, a connecting end 7 is provided at the end of the valve stem 3 facing away from the butterfly plate 2. The connecting end 7 is polygonal. It can be understood that one end of the rocker shaft 53 is provided with a mounting hole that conforms to the shape of the connecting end 7. Since the connecting end 7 is polygonal, relative rotation between the valve stem 3 and the rocker shaft 53 can be avoided, thereby ensuring the accuracy of the rotation angle control of the butterfly plate 2.

[0045] Furthermore, to prevent relative rotation between the valve stem 3 and the connecting shaft 52 in this embodiment, another embodiment is proposed: a columnar connecting end 7 is provided at the end of the valve stem 3 facing away from the butterfly plate 2, and the outer peripheral wall of the connecting end 7 is provided with a cut surface 71. Correspondingly, the mounting hole has a convex surface adapted to the cut surface 71, and the cut surface 71 and the convex surface can form a limit, thereby preventing relative rotation between the valve stem 3 and the connecting shaft 52.

[0046] Preferably, the connecting end 7 and the valve stem 3 are integrally formed, thereby ensuring the connection strength between the connecting end 7 and the valve stem 3 and further improving the service life of the butterfly valve. To further ensure the stability of the connection between the rocker shaft 53 and the valve stem 3, after the rocker shaft 53 and the valve stem 3 are installed, a retaining spring or other fixing structure is snapped onto the valve stem 3 to prevent axial movement between the rocker shaft 53 and the valve stem 3.

[0047] Furthermore, to facilitate the installation of the retaining ring, the connecting end 7 often extends outside the mounting hole. Therefore, to avoid interference between the connecting shaft 52 and the connecting end 7 during rotation, in this embodiment, the connecting shaft 52 is arc-shaped, with its inner arc facing the valve stem 3. It is understood that when the linkage mechanism 5 is about to reach the first dead point or the second dead point position, the arc-shaped connecting shaft 52 can make way for the connecting end 7, avoiding interference between the connecting shaft 52 and the connecting end 7. This ensures that the linkage structure moves smoothly to the first dead point or the second dead point position, thereby ensuring accuracy when adjusting the angle of the butterfly plate 2.

[0048] In this embodiment, a sealing ring 4 is provided between the valve stem 3 and the valve body 1. The sealing ring 4 is made of a flexible material. It can be understood that the sealing ring 4 can seal the gap between the valve stem 3 and the valve body 1 to ensure the sealing of the flow channel 11. Furthermore, the sealing ring 4, made of a flexible material, can further absorb the vibration generated during the rotation of the connecting rod, thereby further reducing the wear of the sealing ring 4.

[0049] The flexible material is rubber. In some other feasible embodiments, the sealing ring 4 can also be made of materials such as polytetrafluoroethylene and polyurethane, and there is no limitation here.

[0050] In this embodiment, the outer periphery of the butterfly plate 2 has an annular conical surface, which is adapted to seal against the inner wall of the flow channel 11. It is understood that the conical surface makes line contact with the inner wall of the flow channel 11, thereby improving the sealing performance between the butterfly plate 2 and the flow channel 11. Furthermore, the conical surface also acts as a guide during the separation process, further reducing the output torque of the rotating motor and lowering production costs.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A butterfly valve, characterized in that, include: The valve body (1) has a flow channel (11); A butterfly plate (2) is disposed inside the flow channel (11) and is used to block or open the flow channel (11); The valve stem (3) is fixedly connected to the butterfly plate (2), and the axis of the valve stem (3) is offset relative to the central axis of the butterfly plate (2). One end of the valve stem (3) passes through the valve body (1). The linkage mechanism (5) has an input end and an output end connected to the valve stem (3), and the input end is offset relative to the output end; The drive mechanism (6) is connected to the input end and is used to drive the valve stem (3) to rotate around its own axis.

2. The butterfly valve according to claim 1, characterized in that, The linkage mechanism (5) includes a crankshaft (51), a connecting shaft (52), and a rocker shaft (53) that are hinged in sequence; The drive mechanism (6) is a rotary motor, the rotating shaft of which is fixedly connected to the crank shaft (51), and the rocker shaft (53) is fixedly connected to the valve stem (3).

3. The butterfly valve according to claim 2, characterized in that, The linkage mechanism (5) has a first dead point position and a second dead point position. When the linkage mechanism (5) is in the first dead point position, the flow channel (11) is in a blocked state; when the linkage mechanism (5) switches from the first dead point position to the second dead point position, the flow channel (11) is in an open state.

4. The butterfly valve according to claim 2, characterized in that, The connecting shaft (52) is arc-shaped, and the inner arc of the connecting shaft (52) faces the valve stem (3).

5. The butterfly valve according to claim 1, characterized in that, The valve stem (3) is provided with a connecting end (7) at the end away from the butterfly plate (2), and the connecting end (7) is polygonal.

6. The butterfly valve according to claim 1, characterized in that, The valve stem (3) is provided with a columnar connecting end (7) at the end away from the butterfly plate (2), and the outer peripheral wall of the connecting end (7) is provided with a cut surface (71).

7. The butterfly valve according to claim 1, characterized in that, A sealing ring (4) is provided between the valve body (1) and the valve stem (3), and the sealing ring (4) is made of a flexible material.

8. The butterfly valve according to claim 7, characterized in that, The flexible material is rubber.

9. The butterfly valve according to claim 1, characterized in that, The outer periphery of the butterfly plate (2) has an annular conical surface, which is adapted to seal the inner wall of the flow channel (11).

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