A butterfly valve disc structure and a butterfly valve for suppressing cavitation

Abstract

The present invention discloses a butterfly valve disc structure and a butterfly valve for suppressing cavitation, comprising: a body, on which a pressure transmission channel and a jet channel are formed, one end of the pressure transmission channel is a pressure transmission hole, and the other end is connected to the jet channel, one end of the jet channel is a jet inlet, and the other end is a jet outlet; a slider, slidably arranged in the pressure transmission channel; and a spring, one end of which is connected to the slider and the other end is connected to the inner wall surface of the jet channel. When the valve is opened and cavitation occurs, the pressure in the low-pressure area of the butterfly disc drops below the saturated vapor pressure, the slider moves to the left, and the jet channel is opened. The jet channel connects the high-pressure area and the cavitation development area of the butterfly disc. When the jet channel is opened, a jet flow is formed in the cavitation development area, suppressing the development of cavitation and also reducing problems such as cavitation erosion and vibration caused by cavitation.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a butterfly valve plate structure and a butterfly valve that inhibits cavitation. Background Art

[0002] A valve is a pressure pipe component that is used to change the pipe section and the flow direction of the medium, and to control the pressure, flow rate, and temperature of the medium being transported. Valves are widely used, and in the national economy, valves are one of the indispensable industrial pipe accessories and equipment.

[0003] Agriculture is the foundation of the national economy. To realize agricultural modernization and to farm scientifically, many valves are needed. For example, valves are indispensable in fertilizer plants, pesticide plants, farmland irrigation and drainage, agricultural mechanization, electrification and other departments. Trains, airplanes, cars, ships in the transportation industry, atomic energy, nuclear industry, rockets, artificial satellites and spacecraft in the defense industry all require a variety of special-purpose valves.

[0004] The name of the butterfly valve comes from the wing-shaped butterfly plate. In the cylindrical channel of the butterfly valve body, the disc-shaped butterfly plate rotates 90 degrees around its butterfly plate axis or the axis outside the butterfly plate to open and close the valve. The butterfly valve is mainly used for cutting or regulating in the pipeline.

[0005] The butterfly valve has the following advantages: ① Small size and light weight. Compared with the gate valve of the same pressure level and the same nominal size, its weight can be reduced by 30%-50%. ② Simple structure, quick opening and closing. The butterfly valve has fewer parts and a relatively compact structure. ③ Good sealing and adjustment performance, and can achieve graded flow control. ④ Small flow resistance and operating torque.

[0006] Cavitation is a phase change phenomenon in which the liquid phase changes to the gas phase when the local pressure of the liquid drops below the saturated vapor pressure. This phenomenon occurs widely in a series of processes such as fluid transmission and underwater navigation, and is an important factor affecting the operation of equipment. At the same time, the occurrence of cavitation will reduce the regulating characteristics of the valve, increase the instability of the valve flow, and increase unnecessary energy loss. Cavitation will also cause vibration and noise in the operation of the equipment. Summary of the invention

[0007] The purpose of the embodiments of the present application is to provide a butterfly valve plate structure and a butterfly valve that can suppress cavitation, so as to solve the problem in the related art that cavitation occurs in local low-pressure areas due to the valve opening and closing parts being located inside the fluid flow area, suppress the development of cavitation, and reduce vibration and noise during equipment operation as well as damage to the valve.

[0008] According to a first aspect of an embodiment of the present application, there is provided a butterfly valve disc structure for suppressing cavitation, comprising:

[0009] A body, wherein a pressure transmission channel and a jet channel are formed on the body, one end of the pressure transmission channel is a pressure transmission hole, and the other end is connected to the jet channel, one end of the jet channel is a jet inlet, and the other end is a jet outlet;

[0010] A slider is slidably disposed in the pressure transmission channel; and

[0011] A spring has one end connected to the slider and the other end connected to the inner wall surface of the jet channel.

[0012] Preferably, the pressure transmission hole is located in a local low-pressure area at the flow-facing end of the butterfly plate.

[0013] Preferably, the side length of the pressure transmission hole is a square of 1 / 50 of the plate length L.

[0014] Preferably, the jet outlet is located at 1 / 5 of the plate length L.

[0015] Preferably, the cross-sectional dimensions of the jet channel and the pressure transmission channel are the same.

[0016] Preferably, the jet channel and the pressure transmission channel are both squares with a side length of 1 / 50 of the plate length.

[0017] Preferably, the surface of the slider is in contact with the inner wall of the pressure transmission channel, and the slider can slide freely on the pressure transmission channel.

[0018] Preferably, when the pressure at the pressure transmission hole is greater than the saturated steam pressure, the spring always holds the slider tightly against the inner wall surface of the jet channel.

[0019] According to a second aspect of an embodiment of the present application, a butterfly valve is provided, comprising the butterfly valve plate structure for suppressing cavitation as described in the first aspect.

[0020] The technical solution provided by the embodiments of the present application may have the following beneficial effects:

[0021] It can be seen from the above embodiments that the present application adopts the method of actively jetting to cut off the cavitation back jet, which can effectively inhibit the generation and development of cavitation, thereby reducing the erosion and damage of cavitation to the valve. The opening and closing of the jet is controlled by the pressure signal at the pressure transmission hole, so it only acts on the flow field when cavitation occurs, and thus will not destroy the stability of the non-cavitation flow field at low flow rate. The improvement of the internal structure of the butterfly plate reduces the damage to the external structure of the disc plate, thereby reducing the impact on the flow performance of the butterfly valve.

[0022] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0024] Figure 1 Schematic diagram of the butterfly plate structure without cavitation suppression structure.

[0025] Figure 2 The diagram is a schematic structural diagram of a butterfly valve disc structure for suppressing cavitation according to an exemplary embodiment.

[0026] Figure 3 The figure is a cross-sectional view from a side perspective of a butterfly valve disc structure for suppressing cavitation according to an exemplary embodiment.

[0027] Figure 4 The cavitation volume fraction comparison cloud diagram of the cavitation suppression effect of the present invention, wherein (a) is a cloud diagram of the cavitation volume fraction of a butterfly valve disc without a cavitation suppression structure, and (b) is a cloud diagram of the cavitation volume fraction of a butterfly valve disc with a cavitation suppression structure.

[0028] Figure numerals: 1, pressure transmission hole; 2, pressure transmission channel; 3, jet outlet; 4, jet channel; 5, slider; 6, spring; 7, jet inlet. DETAILED DESCRIPTION

[0029] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0030] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms of "a", "said" and "the" used in this application and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0031] Figure 1 This is a schematic diagram of a butterfly plate structure without a cavitation suppression structure. When cavitation occurs, the growth of the cavitation bubble will not be suppressed, and the cavitation bubble will fall off quickly and move backward along the butterfly plate to fully develop and expand. When the cavitation bubble bursts, it will produce a huge pressure fluctuation, which will have a great impact on the valve.

[0032] When a traditional butterfly valve is in the open state, serious cavitation will occur near the butterfly plate, which will reduce the regulating characteristics of the valve, increase the instability of the valve flow, increase unnecessary energy loss, and cause vibration and noise in the equipment during operation. The embodiment of the present invention aims to provide a new butterfly valve butterfly plate structure for inhibiting cavitation, which can effectively inhibit the occurrence and development of cavitation, improve the stability of valve flow, and reduce the damage of cavitation to the valve.

[0033] Figure 2 is a schematic structural diagram of a butterfly valve disc structure for suppressing cavitation according to an exemplary embodiment. Figure 3 FIG. 1 is a cross-sectional view of a butterfly valve disc structure for inhibiting cavitation according to an exemplary embodiment, as shown in FIG. Figure 2 and Figure 3 As shown, an embodiment of the present invention provides a butterfly valve plate structure for suppressing cavitation, which may include: a body, a slider 5 and a spring 6, wherein a pressure transmission channel 2 and a jet channel 4 are opened on the body, one end of the pressure transmission channel 2 is a pressure transmission hole 1, and the other end is connected to the jet channel 4, one end of the jet channel 4 is a jet inlet 7, and the other end is a jet outlet 3; the slider 5 is slidably arranged in the pressure transmission channel 2; one end of the spring 6 is connected to the slider 5, and the other end is connected to the inner wall surface of the jet channel 4.

[0034] When the valve is closed, the slider 5 is pressed against the inner wall of the jet channel 4 under the action of the spring 6, and the jet channel is in a closed state. The pressure transmission hole 1 is located in the local low-pressure area of ​​the butterfly plate, when the valve is opened. As the flow velocity of the fluid flowing through the pressure transmission hole 1 increases, the pressure here drops rapidly. The pressure transmission hole 1 acts on one side of the slider 5 through the pressure transmission channel 2. At this time, the slider 5 is subjected to the combined action of the pressure from the pressure transmission hole 1 and the elastic force of the spring 6. When the pressure at the pressure transmission hole 1 drops to the saturated vapor pressure, cavitation occurs, and the slider 5 starts to move, and the jet channel 4 gradually opens. The jet inlet 7 is located in the high-pressure area of ​​the flow basin. When the jet channel 4 is opened, the fluid enters the jet inlet 7 through the jet channel 4, and forms a jet at the jet outlet 3. The jet suppresses cavitation by the active suppression principle of cutting off the back jet.

[0035] In this embodiment, the side length of the pressure transmission hole 1 is a square of 1 / 50 of the plate length L. The pressure transmission hole of this size has little effect on the flow field structure and can quickly transmit the pressure signal.

[0036] In this embodiment, the jet outlet 3 is located at 1 / 5 of the plate length L, which is a high-frequency area for cavitation shedding. The jet outlet is located here to maximize the suppression effect.

[0037] In this embodiment, the cross-sectional dimensions of the jet channel 4 and the pressure transmission channel 2 are the same, which is beneficial to the symmetry of the force applied to the slider when it is located at the junction of the jet channel 4 and the pressure transmission channel 2, and reduces the friction between the slider and the slideway wall.

[0038] In this embodiment, the jet channel 4 and the pressure transmission channel 2 are both squares with a side length of 1 / 50 of the plate length. The jet velocity generated under this size is moderate, which can effectively cut off the cavitation return jet without causing much impact on the flow field structure.

[0039] In this embodiment, the surface of the slider 5 is in contact with the inner wall of the pressure transmission channel 2, and the slider can slide freely on the pressure transmission channel. While ensuring the sealing between the walls, the friction of the slider sliding is minimized to the greatest extent, which is beneficial to the response speed of the slider 5 to the pressure.

[0040] refer to Figure 4 A butterfly plate that suppresses cavitation of the present invention and a butterfly plate that does not have a cavitation suppression structure are simulated under the same operating conditions and openings. Through comparison, it is found that the cavitation volume generated by the butterfly plate structure of the present invention is smaller, the cavitation development cycle is shorter, and the displacement distance of the cavitation is effectively suppressed. This also confirms that the butterfly plate structure of a butterfly valve that suppresses cavitation of the present invention has a good inhibitory effect on cavitation.

[0041] It should be noted that the shape of the body depends mainly on the shape of the pipe. If the pipe is square, the shape of the body is also square. This example takes a square plate as an example. If the pipe is round, the shape of the body is also round. In addition, multiple sets of pressure transmission channels 2 and jet channels 4 can be set on the body, and the specific number is not limited.

[0042] An embodiment of the present application also provides a butterfly valve, comprising the above-mentioned butterfly valve plate structure for suppressing cavitation.

[0043] Those skilled in the art will readily appreciate other embodiments of the present application after considering the description and practicing the contents disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The description and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the claims.

[0044] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A butterfly valve disc structure for suppressing cavitation, characterized in that, comprising: a body, on which a pressure transmission channel and a jet channel are opened. One end of the pressure transmission channel is a pressure transmission hole, and the other end is connected to the jet channel. One end of the jet channel is a jet inlet, and the other end is a jet outlet; a slider, slidably arranged in the pressure transmission channel; and a spring, one end of which is connected to the slider, and the other end is connected to the inner wall surface of the jet channel; the pressure transmission hole is located in the local low-pressure area at the flow-facing end of the butterfly disc; the surface of the slider fits with the inner wall surface of the pressure transmission channel, and the slider can freely slide on the pressure transmission channel; when the pressure at the pressure transmission hole is greater than the saturated vapor pressure, the spring always presses the slider tightly against the inner wall surface of the jet channel.

2. The butterfly valve disc structure for suppressing cavitation according to claim 1, characterized in that, the side length of the pressure transmission hole is a square with a side length of 1 / 50 of the plate length L.

3. The butterfly valve disc structure for suppressing cavitation according to claim 1, characterized in that, the jet outlet is located at 1 / 5 of the plate length L.

4. The butterfly valve disc structure for suppressing cavitation according to claim 1, characterized in that, the jet channel and the pressure transmission channel have the same cross-sectional dimensions.

5. The butterfly valve disc structure for suppressing cavitation according to claim 1, characterized in that, both the jet channel and the pressure transmission channel are squares with a side length of 1 / 50 of the plate length.

6. A butterfly valve, characterized in that, comprising the butterfly valve disc structure for suppressing cavitation according to any one of claims 1-5.

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