Butterfly valve

Abstract

The utility model discloses a butterfly valve, which belongs to the field of valves and comprises a valve body, a butterfly plate, a first control and a second control. A circulation channel is formed in the valve body; the butterfly plate is rotatably located in the circulation channel, and the butterfly plate corresponds to different opening degrees of the butterfly valve when rotating by different angles. The first control and the second control are connected with the butterfly plate and located on the two sides of the butterfly plate respectively, the first control and the second control are in a hollow thin-wall arc cage shape, circulation windows are formed in the first control and the second control respectively, and the circulation windows comprise a plurality of first circulation windows, a plurality of second circulation windows and a plurality of third circulation windows. The first circulation window, the second circulation window and the third circulation window are different in shape. The fluid medium is controlled by the first control and the second control, so that the flow state of the fluid medium is adjusted to be the optimal state, the cavitation phenomenon is reduced to the maximum extent, and the service life of the butterfly valve is prolonged.

Description

Technical Field

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

[0002] A butterfly valve is a type of valve whose closing element (valve disc or butterfly plate) is a disc that rotates around a valve shaft to open and close. It is primarily used in pipelines for shut-off and throttling. The butterfly valve's opening and closing element is a disc-shaped butterfly plate that rotates around its own axis within the valve body to achieve opening, closing, or regulation. Butterfly valves are suitable for use in engineering systems on pipelines conveying various corrosive and non-corrosive fluid media, for regulating and cutting off the flow of the media.

[0003] When the butterfly valve has a small opening, the pressure difference between the two sides of the butterfly valve is large. When the butterfly valve is frequently in this process of small opening and large pressure difference, the liquid will produce a serious cavitation phenomenon when passing through the butterfly valve and the valve body cavity, thereby damaging the sealing surface of the valve body cavity and the butterfly valve. When this damage reaches a certain level, the valve will produce internal leakage and external leakage of medium, resulting in a significant reduction in the service life of the valve. Utility Model Content

[0004] This invention provides a butterfly valve that reduces cavitation and the erosion of the butterfly plate by the fluid medium, thereby extending the valve's service life.

[0005] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0006] A butterfly valve, comprising:

[0007] The valve body has a flow channel inside;

[0008] A butterfly plate is rotatably located in the flow channel, and the butterfly plate rotates at different angles, corresponding to different opening degrees of the butterfly valve.

[0009] It also includes the first control and the second control.

[0010] The first control and the second control are respectively connected to the butterfly plate and located on both sides of the butterfly plate. The first control and the second control are hollow, thin-walled, arc-shaped cages. Each of the first control and the second control has a flow window, which includes a plurality of first flow windows, second flow windows and third flow windows. The shapes of the first flow windows, second flow windows and third flow windows are different.

[0011] As a further improvement, the first flow window is square, the second flow window is circular, and the third flow window is elliptical.

[0012] As a further improvement, the first flow window, the second flow window, and the third flow window are arranged alternately on the first control and the second control.

[0013] As a further improvement, the first and second controls are set within a 90° range of the butterfly plate opening.

[0014] As a further improvement, the total area of ​​the flow window accounts for 50%-70% of the total diameter area of ​​the flow channel.

[0015] As a further improvement, the inner wall of the flow channel of the valve body protrudes to form a valve seat, and a sealing ring is installed on the outer ring of the butterfly plate. When the butterfly plate is rotated to make the sealing ring fully contact the valve seat, the butterfly valve is closed.

[0016] As a further improvement, the butterfly plate is fixedly connected to the valve shaft, and the valve shaft rotates to drive the butterfly plate to rotate synchronously.

[0017] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: In this solution, a first control and a second control are set, which are respectively located on both sides of the butterfly plate. Different shaped flow windows are set on the control. The fluid medium flows out through the first control and the second control on both sides of the butterfly plate. The different shaped flow windows on the control adjust the flow state of the fluid medium, so that the flow state of the fluid medium is adjusted to the optimal state, thereby minimizing cavitation and extending the service life of the butterfly valve.

[0018] Other technical problems that the adjustable butterfly valve of this utility model can solve, other technical features contained in the technical solution, and the advantages brought by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a front view of the overall structure of the butterfly valve;

[0020] Figure 2 This is a rear view of the overall structure of the butterfly valve;

[0021] Figure 3 This is a schematic diagram of the butterfly plate and control structure;

[0022] Figure 4 This is a three-dimensional schematic diagram of the butterfly plate and control structure;

[0023] Figure 5 This is a schematic diagram of the butterfly valve in the closed state.

[0024] Figure 6 This is a schematic diagram of a butterfly valve with its opening degree of 10°.

[0025] Figure 7This is a schematic diagram of a butterfly valve with its opening degree of 20°.

[0026] Figure 8 This is a schematic diagram of a butterfly valve with its opening degree of 30°.

[0027] Figure 9 This is a schematic diagram of a butterfly valve with its opening degree of 50°.

[0028] Figure 10 This is a schematic diagram of a butterfly valve with its opening degree at 90°.

[0029] Label Explanation:

[0030] 1. Valve body; 11. First control; 12. Second control; 111. First flow window; 112. Second flow window; 113. Third flow window; 13. Valve seat; 2. Butterfly plate; 21. Sealing ring; 3. Valve shaft. Detailed Implementation

[0031] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0032] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0033] Furthermore, terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and not intended to limit the scope of implementation. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this utility model. In addition to indicating orientation or positional relationships, some of the aforementioned terms may also have other meanings; for example, the term "upper" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0034] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0035] This embodiment provides a butterfly valve, which is installed in a pipeline system that transports fluid media and mainly functions to cut off and throttle the fluid media in the pipeline.

[0036] Combination Figure 1-4 As shown, a butterfly valve includes a valve body 1, a butterfly plate 2, a first control 11, and a second control 12.

[0037] A flow passage is provided inside the valve body 1; the butterfly plate 2 is rotatably located in the flow passage, and the butterfly plate 2 rotates at different angles to correspond to different opening degrees of the butterfly valve. Specifically, a valve seat 13 is formed by protrusion of the inner side wall of the flow passage of the valve body 1, and a sealing ring 21 is installed on the outer ring of the butterfly plate 2. When the butterfly plate 2 rotates to the point that the sealing ring 21 is in complete contact with the valve seat 13, the butterfly valve is closed.

[0038] The butterfly valve also includes a valve shaft 3, and a butterfly plate 2 is fixedly connected to the valve shaft 3. When the valve shaft 3 rotates, it drives the butterfly plate 2 to rotate synchronously. Figure 1 and Figure 4 To illustrate, valve shaft 3 includes an upper valve shaft and a lower valve shaft, both of which pass through valve body 1 and are rotatably connected relative to valve body 1. One end of each valve shaft is fixedly connected to butterfly plate 2 via pins. The other end of the upper valve shaft extends to the outside of valve body 1 and connects to a transmission assembly. The transmission assembly drives the upper valve shaft to rotate, thereby causing butterfly plate 2 to rotate to different positions. The transmission assembly is an existing drive mechanism, such as a motor.

[0039] Combination Figure 3 and Figure 4 As shown, in this embodiment, the first control 11 and the second control 12 in the butterfly valve are respectively connected to the butterfly plate 2 and located on both sides of the butterfly plate 2. The first control 11 and the second control 12 are hollow, thin-walled, arc-shaped cages. Flow windows are opened on both the first control 11 and the second control 12. The flow windows include a plurality of first flow windows 111, second flow windows 112 and third flow windows 113. The shapes of the first flow windows 111, second flow windows 112 and third flow windows 113 are different.

[0040] In addition, with Figure 1 The view orientation is explained in the diagram. The positions of the first flow window 111, the second flow window 112, and the third flow window 113 on the first control 11 or the second control 12 can be set symmetrically or asymmetrically relative to the horizontal center line of the control.

[0041] As a further improvement, the first control 11 and the second control 12 are set within the 90° range of the butterfly plate opening, that is, when the butterfly valve is closed or fully open, each control partially covers the flow passage in the valve body 1.

[0042] In addition, the total area of ​​the flow window accounts for 60% of the total area of ​​the flow channel. In other cases, the ratio of the total area of ​​the flow window to the total area of ​​the flow channel can be set to other values, but the total area of ​​the flow window should account for 50% to 70% of the total area of ​​the flow channel.

[0043] The first flow window 111 is square, the second flow window 112 is circular, and the third flow window 113 is oval. (See also...) Figure 1 To illustrate the view orientation, near the horizontal center line of the control, the length direction of the square hole in the first flow window 111 is oriented towards the opening and closing direction of the butterfly plate, and the length direction of the elliptical hole in the third flow window 113 is oriented towards the opening and closing direction of the butterfly plate. This can better guide the fluid and reduce cavitation.

[0044] It should be noted that the square holes in the first flow window 111 located at different positions can be the same or different in size; the circular holes in the second flow window 112 located at different positions can be the same or different in size; and the elongated holes in the third flow window 113 located at different positions can be the same or different. The sizes of the first flow window 111, the second flow window 112, and the third flow window 113 can be determined according to the available space at their locations. Ultimately, the total area of ​​the flow windows should account for 50% to 70% of the total diameter area of ​​the flow channel to achieve the best effect in reducing cavitation.

[0045] Combination Figure 5-10 As shown in the figure, the butterfly valve opening states are displayed when the butterfly plate 2 is rotated to different positions: 0° (butterfly valve closed), 10°, 20°, 30°, 50°, and 90° (butterfly valve fully open). Before the improvement, without the first control 11 and the second control 12, the fluid pressure difference on both sides of the butterfly plate was large when the butterfly valve opening was different, especially in the small opening range. In this case, the fluid medium directly eroded the sealing surfaces of the butterfly plate 2 and valve seat 13, resulting in severe cavitation and damaging the sealing surfaces and butterfly plate 2. Since the butterfly plate 2 is the only valve control of the butterfly valve, once it is damaged, the entire butterfly valve may need to be replaced.

[0046] The improved design is illustrated using an example where the fluid medium enters from the first control 11 side and flows out from the second control 12 side. When the butterfly valve is at different opening degrees, such as when the opening degree is less than 20°, the fluid medium flows out through the first control 11 and the second control 12 on both sides of the butterfly plate 2. The flow windows of different shapes on the controls adjust the flow pattern of the fluid medium. Simultaneously, by coordinating different opening directions of the flow windows, the flow pattern of the fluid medium is adjusted to the optimal state, thereby minimizing cavitation and extending the service life of the butterfly valve.

[0047] The terms "installation," "setup," "equipped with," and "connection" used herein should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0048] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A butterfly valve, comprising: Valve body (1), with a flow channel inside; The butterfly plate (2) is rotatably located in the flow channel, and the butterfly plate (2) rotates at different angles to correspond to different opening degrees of the butterfly valve; Its characteristic is that it further includes a first control (11) and a second control (12). The first control (11) and the second control (12) are respectively connected to the butterfly plate (2) and located on both sides of the butterfly plate (2). The first control (11) and the second control (12) are hollow, thin-walled, arc-shaped cages. Flow windows are opened on the first control (11) and the second control (12). The flow windows include a plurality of first flow windows (111), second flow windows (112) and third flow windows (113). The shapes of the first flow windows (111), second flow windows (112) and third flow windows (113) are different.

2. The butterfly valve according to claim 1, characterized in that: The first flow window (111) is square, the second flow window (112) is circular, and the third flow window (113) is elliptical.

3. The butterfly valve according to claim 2, characterized in that: On the first control (11) and the second control (12), the first flow window (111), the second flow window (112) and the third flow window (113) are arranged alternately at intervals.

4. The butterfly valve according to any one of claims 1-3, characterized in that: The first control (11) and the second control (12) are set within the 90° range of the butterfly plate opening.

5. The butterfly valve according to claim 4, characterized in that: The total area of ​​the circulation window accounts for 50%-70% of the total diameter area of ​​the circulation channel.

6. The butterfly valve according to claim 1, characterized in that: The valve body (1) has a valve seat (13) formed by the protrusion of the inner side wall of the flow channel. A sealing ring (21) is installed on the outer ring of the butterfly plate (2). When the butterfly plate (2) is rotated to make the sealing ring (21) fully contact the valve seat (13), the butterfly valve is closed.

7. The butterfly valve according to claim 6, characterized in that: The butterfly plate (2) is fixedly connected to the valve shaft (3), and the valve shaft (3) rotates to drive the butterfly plate (2) to rotate synchronously.

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