Bionic butterfly plate for inhibiting cavitation of butterfly valve and butterfly valve

Abstract

The utility model discloses a bionic butterfly plate for inhibiting cavitation of a butterfly valve and the butterfly valve. The bionic butterfly plate comprises a butterfly plate body, the bionic fish scale structure is attached to the surface of the front end of the back flow side of the butterfly plate body. The bionic fish scale structure has a blocking effect on the back-jet flow generated near the butterfly plate, so that the local pressure of the fluid at the fish scale structure is increased, and cavitation is inhibited. The structure also refers to the shape of fish scales which bring a resistance reduction effect when fishes in nature quickly move in water, so that the influence on the circulation performance of the valve is reduced as far as possible while the contact area between the butterfly plate and fluid is increased, the viscous acting force of a near wall surface is enhanced and the turbulence degree of a flow field is reduced; and compared with a common bulge structure, the anti-drag effect is better.

Description

Technical Field

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

[0002] Valves play an indispensable role in industrial production equipment such as energy and chemical industry, oil and gas transportation. The regulating function of valves plays an important role in the stability and reliability of the pipeline system. There are many types of valves, and you can choose valves suitable for working conditions according to their uses and functions, structural characteristics and structural principles. Among them, butterfly valves are widely used in pipeline fluid transportation due to their relatively simple structure, light weight and sensitive operation. They mainly play the role of regulating and cutting off the medium. However, during the flow of liquid, when the local pressure drops below the saturated vapor pressure corresponding to the local temperature, cavitation will occur. This is the process of liquid phase change to gas. Cavitation affects the flow capacity of the butterfly valve, and the collapse of the bubbles will release energy to damage the valve body and pipeline. Cavitation is usually accompanied by vibration and noise, which seriously affects the stability of the system and the service life of the equipment.

[0003] Therefore, a bionic fish scale butterfly plate structure is proposed to inhibit the cavitation of butterfly valve, which can reduce the degree of cavitation during the operation of the butterfly valve and reduce the damage caused by cavitation to the valve, which is of great significance to ensure the long-term stable operation of the system. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a bionic fish scale butterfly plate and butterfly valve for suppressing cavitation of a butterfly valve, so as to reduce the degree of cavitation occurring during the operation of the butterfly valve, reduce the damage caused by cavitation to the valve, improve the stability of the system operation, and extend the operating life of the system.

[0005] In a first aspect, according to an embodiment of the present application, a bionic butterfly plate for suppressing cavitation of a butterfly valve is provided, comprising:

[0006] Butterfly plate body;

[0007] The bionic fish scale structure is attached to the front end surface of the back-stream side of the butterfly plate body.

[0008] Optionally, the bionic fish scale structure forms an angle a=10° with the axis of the butterfly plate body.

[0009] Optionally, the bionic fish scale structure is formed by a plurality of rows stacked in an interlaced manner, and each row is formed by a plurality of semicircular pieces with rounded corners arranged in a line, and two adjacent semicircular pieces do not overlap.

[0010] Optionally, the radius of the semicircular piece is Rf=1 mm.

[0011] Optionally, the distance L1 between the centers of two adjacent semicircular pieces in the same row is 2 mm.

[0012] Optionally, the center of the semicircular piece in the next row is located on the center line of the centers of the two semicircular pieces in the previous row.

[0013] Optionally, a vertical distance H between the centers of the upper row and the lower row is 0.5 mm.

[0014] In a second aspect, a butterfly valve is provided according to an embodiment of the present application, comprising a butterfly valve plate for suppressing cavitation as described in the first aspect.

[0015] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0016] The bionic fish scale structure blocks the back jet flow generated near the butterfly plate, which increases the local pressure of the fluid at the fish scale structure, thereby inhibiting cavitation. In addition, this structure increases the contact area between the butterfly plate and the fluid, enhances the viscous force near the wall, and reduces the turbulence of the flow field, while minimizing the impact on the flow performance of the valve. Compared with ordinary convex structures, it has a better drag reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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.

[0018] Figure 1 is a top view of an original butterfly valve disc according to an exemplary embodiment.

[0019] Figure 2 is a side view of an original butterfly valve disc according to an exemplary embodiment.

[0020] Figure 3 is a top view of a bionic fish scale butterfly plate with cavitation suppression function according to an exemplary embodiment.

[0021] Figure 4 is a side view of a bionic fish scale butterfly plate with cavitation suppression function according to an exemplary embodiment.

[0022] Figure 5 It is a schematic diagram of the fluid domain and butterfly plate details of a butterfly valve with a bionic fish scale butterfly plate structure that can suppress cavitation according to an exemplary embodiment.

[0023] Figure 6 It is a gas phase volume curve diagram of the flow field under the same working conditions of two butterfly plate structures according to an exemplary embodiment.

[0024] Figure 7 is a cavitation cloud diagram of a typical cycle of a prototype butterfly valve according to an exemplary embodiment

[0025] Figure 8 It is a cavitation cloud diagram of a typical cycle of a butterfly valve with a bionic fish scale butterfly plate structure for suppressing cavitation according to an exemplary embodiment.

[0026] The reference numerals in the figures are:

[0027] 1. Butterfly plate body; 2. Bionic fish scale structure; 21. Semicircular piece. DETAILED DESCRIPTION

[0028] 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.

[0029] 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.

[0030] refer to Figure 1 and Figure 2 The original butterfly valve disc surface is smooth, but during use, cavitation is prone to occur on the back of the butterfly valve (the low-pressure side disc surface). The cavitation phenomenon damages the valve and reduces the stability and life of the butterfly valve.

[0031] refer to Figure 3-Figure 5 According to an embodiment of the present application, a bionic butterfly plate for suppressing cavitation in a butterfly valve is provided, comprising a butterfly plate body 1 and a bionic fish scale structure 2, wherein the bionic fish scale structure 2 is attached to the front end surface of the back flow side of the butterfly plate body 1, that is, the side prone to cavitation.

[0032] Specifically, the bionic fish scale structure 2 is formed by a plurality of rows stacked alternately, and each row is formed by a plurality of semicircular pieces 21 with rounded corners arranged in a line, and two adjacent semicircular pieces 21 do not overlap.

[0033] As a preferred embodiment, the bionic fish scale structure 2 is semicircular with Rf=1mm and is rounded. Figure 5The structure is evenly distributed on the back of the butterfly valve, that is, the low-pressure side butterfly plate surface prone to cavitation. The structure is at an angle of a = 10° with the butterfly plate axis. The distance between the centers of the semicircular pieces 21 in the same row is L1 = 2mm, and the upper and lower rows are staggered, that is, the center of the semicircular pieces 21 in the next row is located on the center line of the centers of the two fish scale structures in the previous row, L2 = 1mm. The vertical distance between the centers of the semicircular pieces 21 in the previous row and the semicircular pieces 21 in the next row is H = 0.5mm.

[0034] The principle of the utility model for inhibiting cavitation is that the bionic fish scale structure 2 forms a blocking effect on the back jet flow generated near the butterfly plate, so that the local pressure of the fluid at the fish scale structure increases, thereby inhibiting cavitation. The structure also refers to the shape of the fish scales with a drag reduction effect when fish move quickly in the water in nature. While increasing the contact area between the butterfly plate and the fluid, enhancing the viscous force near the wall, and reducing the turbulence of the flow field, the impact on the flow performance of the valve is minimized as much as possible, and has a better drag reduction effect than ordinary convex structures.

[0035] In order to verify the effectiveness of bionic fish scale structure 2 on cavitation suppression of butterfly valve, CFD numerical calculations were performed on the prototype butterfly valve and the butterfly valve with bionic fish scale structure 2. Figure 6 It is a curve diagram of the gas phase volume of the flow field under the same working conditions of two butterfly plate structures according to an exemplary embodiment. It can be seen from the figure that although the duration of the cavitation cycle of the butterfly valve with the bionic fish scale structure 2 is not much different from that of the prototype butterfly valve, the cavitation volume of each cycle of the butterfly valve with the bionic fish scale structure 2 is smaller than that of the prototype, and the peak value of the cavitation volume in almost every cycle is smaller than the minimum value of the cavitation volume of the prototype butterfly valve. It can be seen that the bionic fish scale structure 2 has a significant inhibitory effect on the cavitation volume of the flow field.

[0036] Figure 7 is a cavitation diagram of a typical cycle of a prototype butterfly valve according to an exemplary embodiment. Figure 8 is a cavitation diagram of a typical cycle of a butterfly valve with a bionic fish scale butterfly plate structure that suppresses cavitation according to an exemplary embodiment, where t is time, T is a typical cavitation cycle, and the comparison is Figure 7 and Figure 8 It can be found that at each moment in the typical cycle, except for 6 / 6T, the overall cavitation volume generated by the butterfly valve with the bionic fish scale structure 2 is much smaller than that of the prototype butterfly valve. The larger cavitation volume at 6 / 6T is due to the fact that when the cavitation of the current cycle collapses at this place, the cavitation of the next cycle has already occurred. More significantly, the cavitation volume above the front half of the butterfly plate with the bionic fish scale structure 2 is significantly smaller than that of the prototype butterfly valve, which further confirms that the bionic fish scale butterfly plate structure for suppressing cavitation in the utility model has a good suppressing effect on cavitation.

[0037] An embodiment of the present application further provides a butterfly valve, comprising the above-mentioned butterfly plate structure for suppressing cavitation.

[0038] 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.

[0039] 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 bionic butterfly plate for inhibiting cavitation of a butterfly valve, characterized in that: include: Butterfly plate body; and The bionic fish scale structure is attached to the front end surface of the back-stream side of the butterfly plate body.

2. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 1, characterized in that: The bionic fish scale structure forms an angle of a=10° with the axis of the butterfly plate body.

3. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 1, characterized in that: The bionic fish scale structure is formed by stacking a plurality of rows in an interlaced manner, and each row is formed by a plurality of semicircular pieces with rounded corners arranged in a line, and two adjacent semicircular pieces do not overlap.

4. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 3, characterized in that: The radius of the semicircular piece Rf = 1 mm.

5. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 3, characterized in that: The distance between the centers of two adjacent semicircular pieces in the same row is L1=2mm.

6. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 3, characterized in that: The center of the semicircle in the next row is located on the center line of the centers of the two semicircles in the previous row.

7. The bionic butterfly plate for inhibiting cavitation of a butterfly valve according to claim 3, characterized in that: The vertical distance between the center of the previous row and the next row is H=0.5mm.

8. A butterfly valve, characterized in that: The bionic butterfly plate for inhibiting cavitation of a butterfly valve comprises the bionic butterfly plate according to any one of claims 1 to 7.

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