Throttle switch valve with anti-cavitation structure

Abstract

The invention discloses a throttle switch valve with an anti-cavitation structure. The throttle switch valve comprises a switch valve body, a switch valve core and a switch valve sleeve, the switch valve core is sleeved in the switch valve sleeve; an overflowing hole of the switch valve sleeve is of a triangular structure, the triangular structure is in a step shape from inside to outside, the outline of each step is triangular, the triangle at the outermost end is the smallest, and the triangle at the innermost side is the largest. A circulation channel of the switch valve element and the innermost triangle are the same in shape and are located on the same straight line. The expansion triangular step overflowing hole is adopted, the cavitation phenomenon can be effectively restrained, the performance and reliability of the switch valve are improved, and the valve is more suitable for extreme scenes such as ultrahigh pressure and rapid opening and closing.

Description

Technical Field

[0001] The invention relates to the technical field of throttling switch valves, and in particular to a throttling switch valve with an anti-cavitation structure. Background Art

[0002] The throttle switch valve is a key component in the hydraulic system and is widely used in aerospace, automobile manufacturing, industrial automation and energy. Its main function is to control the flow and pressure of the fluid by adjusting the valve opening. However, under high pressure, large flow or rapid opening and closing conditions, the fluid is prone to drastic pressure changes when flowing through the throttle switch valve, causing the local pressure to drop below the saturated vapor pressure, thereby inducing cavitation. The formation and collapse of cavitation will not only reduce the flow control accuracy of the valve, but also cause noise, vibration and cavitation damage, seriously affecting the service life of the valve and system reliability.

[0003] In recent years, researchers have proposed a variety of anti-cavitation structural designs, aiming to reduce the occurrence of cavitation and its damage to valves by optimizing flow channel geometry, improving material selection and using special coating technology. For example, the use of stepped, triangular or semicircular valve port designs can effectively disperse fluid energy, reduce local pressure gradients, and thus inhibit the formation of cavitation. In addition, by spraying cavitation-resistant materials (such as WC / Co ceramic coatings) on the surface of the valve body and valve core, the valve's anti-cavitation ability can be significantly improved and its service life can be extended.

[0004] The prior art publication number CN117627983A discloses a large flow unloading and anti-cavitation valve assembly, which achieves damage to the hydraulic system when the load is low pressure or high pressure through the designed cone valve. However, under extreme working conditions (such as ultra-high pressure, rapid opening and closing), cavitation is still difficult to completely avoid, so it is necessary to optimize the anti-cavitation structure. Summary of the invention

[0005] 1. Technical problems to be solved: In response to the above technical problems, the present invention provides a throttling switch valve with an anti-cavitation structure. The triangular stepped valve port adopted by the throttling switch valve is an optimized flow channel design. Through its unique geometric shape and structural characteristics, it can effectively suppress the occurrence of cavitation, improve the performance and reliability of the switch valve, and is more suitable for extreme scenarios such as ultra-high pressure and rapid opening and closing.

[0006] 2. Technical solution: A throttling switch valve with an anti-cavitation structure is characterized by: comprising a switch valve body, a switch valve core, and a switch valve sleeve; the switch valve core is sleeved in the switch valve sleeve; the flow hole of the switch valve sleeve is a triangular structure, and the triangular structure is stepped from the inside to the outside, each step is a triangle, the outermost triangle is the smallest, and the innermost triangle is the smallest; the flow channel of the switch valve core is the same shape as the innermost triangle and is located on the same straight line.

[0007] Furthermore, the steps formed by the triangles of the flow holes have at least two layers, and the triangles expand in the same proportion from the outside to the inside.

[0008] Furthermore, each triangle in the triangular structure is an isosceles triangle with a vertex angle ranging from 20° to 60°, and the extension direction of the two waists of the triangle is the same as the extension direction of the valve core of the switch valve.

[0009] Furthermore, the step angle between two adjacent triangles of the triangular structure is 90-120°; and the three corners of the triangle are all rounded.

[0010] Furthermore, the switch valve core is a metal cylindrical valve core; the switch valve sleeve is cylindrical, and the outer wall of the switch valve core and the inner wall of the switch valve sleeve are interference fit.

[0011] Furthermore, it also includes a switch valve stem; the switch valve stem is connected to the top surface of the switch valve core and extends upward to connect to the control unit; the control unit is a handle control or electromagnetic control device to control the rotation of the switch valve core.

[0012] Furthermore, a valve cover is provided at the connection position between the side wall of the switch valve body and the switch valve core, and a sealing gasket is provided between the two.

[0013] Furthermore, a valve cover sealing structure is provided between the valve cover and the valve core of the switch valve.

[0014] 3. Beneficial effects: The throttling switch valve with an anti-cavitation structure provided by the present invention adopts an expanded triangular stepped flow hole and has the following advantages: (1) Optimize the flow field distribution of the liquid inside the valve body: The special structure of the triangular stepped valve port formed between the valve body and the valve sleeve can form a relatively uniform and stable flow field when the fluid passes through; compared with the ordinary valve port, it can effectively avoid the rapid flow velocity changes and vortex areas of the fluid. For example, during the opening and closing process of the valve, the ordinary valve port may cause the fluid to flow too fast in a local area, while the triangular stepped valve port, through its stepped design, gradually accelerates or decelerates the fluid, and the flow velocity changes relatively smoothly, thereby reducing the large pressure fluctuations caused by sudden changes in flow velocity and reducing the possibility of cavitation.

[0015] (2) Dispersed pressure drop: The triangular stepped valve port disperses the pressure drop of the entire valve on multiple steps; this design makes the pressure drop no longer concentrated in a certain local area of ​​the valve port, but gradually decreases along the steps. The pressure change on each step is relatively small, and the overall pressure change of the fluid is more stable when passing through the valve port, which can effectively prevent the local pressure from being too low to reach the saturated vapor pressure of the fluid, thereby inhibiting the formation of cavitation. For example, under high pressure difference conditions, ordinary valve ports may cause cavitation due to excessively concentrated pressure drop, while the triangular stepped valve port can maintain a higher pressure level under the same working conditions by dispersing the pressure drop, avoiding the occurrence of cavitation.

[0016] (3) Enhanced pressure recovery capability: After the fluid passes through the triangular stepped valve port, its stepped structure helps to restore the pressure. In the process of the fluid flowing from one step to another, the flow rate and pressure will change accordingly, and the kinetic energy and pressure energy of the fluid will be converted into each other. Due to the triangular shape characteristics, the flow of fluid between the steps can better utilize this energy conversion, so that the pressure can be restored faster after passing through the valve port, reducing the possibility of cavitation. Even if tiny bubbles have appeared in the fluid in some cases, the rapid recovery of pressure can make these bubbles dissolve again in the fluid, thereby inhibiting the further development of cavitation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The overall external view of the throttling switch valve with an anti-cavitation structure of the present invention; Figure 2 It is a cross-sectional view of the valve body, valve core and valve sleeve of the switch valve of the present invention; Figure 3 It is a schematic diagram of the structure of the valve sleeve of the switch valve in the present invention; Figure 4 A perspective view of a valve sleeve of a switch valve in the present invention; Figure 5 It is a structural diagram of the valve core of the switch valve in the present invention.

[0018] Reference numerals: switch valve body 1 ; switch valve core 2 ; switch valve sleeve 3 ; triangular structure 4 ; flow channel 5 of the switch valve core 5 ; valve cover 6 ; control unit 7 . DETAILED DESCRIPTION

[0019] The present invention will be described in detail below with reference to the accompanying drawings.

[0020] As attached Figure 1 To Attachment Figure 5A throttling switch valve with an anti-cavitation structure is shown, characterized in that it includes a switch valve body 1, a switch valve core 2, and a switch valve sleeve 3; the switch valve core is sleeved in the switch valve sleeve; the flow hole of the switch valve sleeve is a triangular structure 4, and the triangular structure is stepped from the inside to the outside, and the outer contour of each step is a triangle, the outermost triangle is the smallest, and the innermost triangle is the largest; the flow channel 5 of the switch valve core is the same shape as the innermost triangle and is located on the same straight line.

[0021] As attached Figure 1 As shown, it is the external view of the switch valve of the application. In Figure 7, an electromagnetic relay is connected to the valve stem to realize the on-off control of the switch valve. In practice, a round handle or a long handle is usually used to manually realize the on-off control.

[0022] Furthermore, the steps formed by the triangles of the flow holes have at least two layers, and the triangles expand in the same proportion from the outside to the inside.

[0023] As attached Figure 2 , 4 As shown in the figure, only the two-layer stepped structure formed by three triangles is shown. During the opening and closing process of the valve, the ordinary valve port may cause the fluid to flow too fast in the local area, while the triangular stepped valve port, through its stepped design, gradually accelerates or decelerates the fluid, and the flow rate changes relatively smoothly, thereby reducing the large pressure fluctuations caused by sudden changes in flow rate and reducing the possibility of cavitation.

[0024] Furthermore, each triangle in the triangular structure is an isosceles triangle with a vertex angle ranging from 20° to 60°, and the extension direction of the two waists of the triangle is the same as the extension direction of the valve core of the switch valve.

[0025] The triangular structure can form a triangular flow channel in the valve body: the triangular shape helps to disperse the fluid energy and further reduce the formation of local low-pressure areas; more preferably, the triangle is an isosceles triangle, and the specific vertex angle is determined according to the length-to-width ratio of the valve body.

[0026] Furthermore, the step angle between two adjacent triangles of the triangular structure is 90-120°; and the three corners of the triangle are all rounded.

[0027] The rounded corner design can reduce turbulence and eddy currents: The rounded corner design can smooth the flow of fluid, reduce the generation of turbulence and eddy currents, and reduce energy loss; it can improve the flow characteristics of the fluid, and improve the accuracy and stability of flow control; fast response: The optimized flow channel design can improve the response speed of the valve and adapt to the needs of fast opening and closing and dynamic adjustment.

[0028] Furthermore, the switch valve core is a metal cylindrical valve core; the switch valve sleeve is cylindrical, and the outer wall of the switch valve core and the inner wall of the switch valve sleeve are interference fit.

[0029] Furthermore, it also includes a switch valve stem; the switch valve stem is connected to the top surface of the switch valve core and extends upward to connect to the control unit 7; the control unit is a handle control or electromagnetic control device to control the rotation of the switch valve core.

[0030] As attached Figure 1 As shown, the electromagnetic control device is connected to the valve core in the inner cavity of the valve body through the valve stem.

[0031] Furthermore, a valve cover 6 is provided at the connection position between the side wall of the switch valve body and the switch valve core, and a sealing gasket is provided between the two.

[0032] Furthermore, a valve cover sealing structure is provided between the valve cover and the valve core of the switch valve.

[0033] The installation process of a throttling switch valve with an anti-cavitation structure of the present invention is as follows: The switch valve sleeve is used to deform the angle of the cylindrical switch valve sleeve, and the deformed switch valve sleeve is tightly pressed into the switch valve body by mechanical assembly. The switch valve body and the switch valve sleeve are heated as a whole, and when a certain temperature is reached, the valve sleeve molding tool performs a sealing fit between the switch valve body and the switch valve sleeve. The inner wall of the valve body is tightly meshed with the outside of the valve sleeve to achieve the effect of the valve body and the valve sleeve being integrated. The flow hole of the valve sleeve and the flow channel of the valve core are in the same straight line, and the control unit controls the rotation of the valve core to realize the on and off of the liquid flow channel.

[0034] Although the present invention has been disclosed as above in terms of preferred embodiments, they are not intended to limit the present invention. Anyone skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection defined by the claims of this application.

Claims

1. A throttling switch valve with an anti-cavitation structure, characterized in that: It includes a switch valve body, a switch valve core, and a switch valve sleeve; the switch valve core is sleeved in the switch valve sleeve; the flow hole of the switch valve sleeve is a triangular structure, and the triangular structure is stepped from the inside to the outside, and the outer contour of each step is a triangle, the outermost triangle is the smallest, and the innermost triangle is the largest; the flow channel of the switch valve core is the same shape as the innermost triangle and is located on the same straight line.

2. A throttling switch valve with an anti-cavitation structure according to claim 1, characterized in that: The steps formed by the triangles of the flow holes have at least two layers, and the triangles expand in the same proportion from the outside to the inside.

3. A throttling switch valve with an anti-cavitation structure according to claim 2, characterized in that: Each triangle in the triangular structure is an isosceles triangle with a vertex angle ranging from 20° to 60°. The extension direction of the two waists of the triangle is the same as the extension direction of the valve core of the switch valve.

4. The throttle switch valve with an anti-cavitation structure according to claim 1, characterized in that: The step angle between two adjacent triangles of the triangular structure is 90-120°; and the three corners of the triangle are all rounded.

5. The throttling switch valve with an anti-cavitation structure according to claim 1, characterized in that: The switch valve core is a metal column-shaped core; the switch valve sleeve is cylindrical, and the outer wall of the switch valve core and the inner wall of the switch valve sleeve are interference-fitted.

6. The throttling switch valve with an anti-cavitation structure according to claim 1, characterized in that: It also includes a switch valve stem; the switch valve stem is connected to the top surface of the switch valve core and extends upward to connect to the control unit; the control unit is a handle control or electromagnetic control device to control the rotation of the switch valve core.

7. The throttle switch valve with an anti-cavitation structure according to claim 1, characterized in that: A valve cover is provided at the connection position between the side wall of the switch valve body and the switch valve core, and a sealing gasket is provided between the two.

8. The throttling switch valve with an anti-cavitation structure according to claim 7, characterized in that: A valve cover sealing structure is provided between the valve cover and the valve core of the switch valve.

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