High-precision electric control valve

Abstract

The utility model discloses a high-precision electric regulating valve, which relates to the technical field of valves, and comprises a valve body, the valve body is provided with an inlet channel and an outlet channel, a valve cover is arranged on the valve body, a regulating sleeve, a valve core and a valve rod are arranged in the valve body, the valve core is connected with the valve rod, the upper end of the valve rod extends out of the valve cover to be connected with an electric actuating mechanism, and the valve cover is connected with the electric actuating mechanism. The valve element moves up and down in the adjusting sleeve, a sealing face in sealing fit with the valve element is arranged on the inner wall of the adjusting sleeve, an adjusting hole is formed in the side of the adjusting sleeve, the lower end of the adjusting sleeve extends to the inlet channel, a plurality of throttling holes are formed in the bottom of the adjusting sleeve, and the throttling holes are communicated with the inlet channel and an inner cavity of the adjusting sleeve. And a flow slowing mechanism is arranged in the adjusting sleeve. When a high-pressure medium is low in opening degree, the medium impacts the valve element more evenly after flow stabilization and flow slowing, and the adjusting precision can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a high-precision electric control valve. Background Art

[0002] The electric control valve is an important actuator unit instrument in industrial automation process control. With the increasing automation degree in the industrial field, it is being more and more applied in various industrial production fields. The existing electric control valve controls the downstream flow or pressure of the valve by setting adjusting holes on the adjusting sleeve and covering the area of the adjusting holes by the valve core. When the valve of the high-pressure pipeline is at a small opening, the medium flow is unstable, the acting force on the valve core is unbalanced, the flow fluctuates greatly up and down, and the adjustment accuracy is low. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the utility model provides a high-precision electric control valve.

[0004] The technical solution provided by the utility model is as follows:

[0005] A high-precision electric control valve includes a valve body, the valve body is provided with an inlet passage and an outlet passage, the valve body is provided with a valve cover, the valve body is internally provided with an adjusting sleeve, a valve core and a valve rod, the valve core is connected to the valve rod, the upper end of the valve rod extends out of the valve cover and is connected to an electric actuator, the valve core moves up and down in the adjusting sleeve, the inner wall of the adjusting sleeve is provided with a sealing surface that is hermetically matched with the valve core, an adjusting hole is provided on the side of the adjusting sleeve, the lower end of the adjusting sleeve extends to the inlet passage, a plurality of throttling holes are provided at the bottom of the adjusting sleeve, the throttling holes communicate the inlet passage with the inner cavity of the adjusting sleeve, and a flow buffering mechanism is arranged in the adjusting sleeve.

[0006] The flow buffering mechanism includes a base, a plurality of guide vanes are arranged on the base, an installation post is arranged at the bottom of the adjusting sleeve, and the base is installed on the installation post through a nut and can freely rotate around the installation post.

[0007] A bearing is arranged between the base and the bottom of the adjusting sleeve.

[0008] The throttling hole includes a first inclined part and a second inclined part, and the central axis of the first inclined part forms a 90° angle with the central axis of the second inclined part.

[0009] A sealing gasket is arranged between the adjusting sleeve and the valve body, and a sealing gasket is arranged between the adjusting sleeve and the valve cover.

[0010] A packing assembly is arranged between the valve cover and the valve rod, the packing assembly includes packing, a packing pressing plate and a packing gland, and the packing gland is connected to the valve cover through a bolt to compress the packing pressing plate, and further compress the packing.

[0011] A bracket is provided between the valve cover and the electric actuator. A travel scale is provided on the bracket, and a travel pointer is provided on the valve stem.

[0012] A limiting inclined surface is provided on the inner wall of the adjusting sleeve, and a limiting protrusion adapted to the limiting inclined surface is provided on the outer surface of the valve core.

[0013] Advantages of the present utility model: By extending the lower end of the adjusting sleeve to the inlet passage, several throttling holes are provided at the bottom of the adjusting sleeve. When the high-pressure medium is at a small opening, the fluid can be stabilized. A flow buffering mechanism is provided inside the adjusting sleeve, and the flow buffering mechanism buffers the stabilized fluid passing through the throttling holes, making the impact of the medium on the valve core more uniform and effectively improving the adjustment accuracy. Description of the Drawings

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 is Figure 1 a partial enlarged view of... Detailed Embodiment

[0016] The following further describes the embodiments of the present utility model with reference to the drawings.

[0017] As Figure 1-2 shown, a high-precision electric control valve includes a valve body 1. The valve body 1 is provided with an inlet passage 11 and an outlet passage 12. A valve cover 5 is provided on the valve body 1. An adjusting sleeve 2, a valve core 3, and a valve stem 4 are provided inside the valve body 1. The valve core 3 is connected to the valve stem 4 by bolts. The upper end of the valve stem 4 extends out of the valve cover and is connected to an electric actuator 13. An adjusting hole 6 is provided on the side of the adjusting sleeve 2. The valve core 3 moves up and down inside the adjusting sleeve 2, and controls the downstream flow or pressure of the valve by covering the area of the adjusting hole 6. A sealing surface 14 that forms a sealing fit with the valve core 3 is provided on the inner wall of the adjusting sleeve 2. The lower end of the adjusting sleeve 2 extends to the inlet passage 11. Several throttling holes 31 are provided at the bottom of the adjusting sleeve 2. The throttling holes 31 communicate the inlet passage 11 with the inner cavity of the adjusting sleeve. A flow buffering mechanism is provided inside the adjusting sleeve. The flow buffering mechanism includes a base 35. Several guide vanes 37 are provided on the base 35. An installation post 34 is provided at the bottom of the adjusting sleeve. The base 35 is installed on the installation post by a nut and can freely rotate around the installation post. In the scenario of high-pressure medium, when the valve is at a small opening, the medium flow is unstable. The medium in the inlet passage can stabilize the fluid through the throttling holes. The stabilized fluid enters the inner cavity of the adjusting sleeve. The medium impacts the guide vanes 37, causing the base 35 to freely rotate around the installation post for buffering. The medium that has been stabilized and buffered impacts the valve core more evenly, effectively improving the adjustment accuracy of the control valve.

[0018] In this embodiment, a bearing 36 is provided between the base 35 and the bottom of the adjusting sleeve. The bearing 36 provides support for the base 35 and can prevent excessive friction caused by the contact between the base 35 and the bottom of the adjusting sleeve, which may prevent normal rotation. It can also effectively extend the service life of the flow buffering mechanism.

[0019] In this embodiment, the throttle hole 31 includes a first inclined portion 32 and a second inclined portion 33. The central axis of the first inclined portion 32 forms a 90° angle with the central axis of the second inclined portion 33. Compared with a straight-through throttle hole, the bent throttle hole 31 has a better flow stabilizing effect.

[0020] In this embodiment, a sealing gasket 21 is provided between the adjusting sleeve 2 and the valve body 1, a sealing gasket 25 is provided between the adjusting sleeve 2 and the valve cover 5, and a packing assembly is provided between the valve cover 5 and the valve stem 4. The packing assembly includes a packing 6, a packing pressing plate 7, and a packing gland 8. The packing gland 8 is connected to the valve cover 5 by bolts to press the packing pressing plate 7, and further press the packing 6. The sealing gasket and the packing assembly ensure the sealing reliability of the mating joints between the valve components.

[0021] In this embodiment, a bracket 9 is provided between the valve cover 5 and the electric actuator 13. A stroke scale 10 is provided on the bracket 9, and a stroke pointer is provided on the valve stem. The stroke scale 10 and the stroke pointer are used to indicate the movement stroke of the valve stem to determine the opening degree of the valve, so as to achieve precise adjustment.

[0022] In this embodiment, a limiting inclined surface 23 is provided on the inner wall of the adjusting sleeve 2, and a limiting protrusion 24 adapted to the limiting inclined surface 23 is provided on the outer surface of the valve core 3, so that the valve core 3 will not move downward excessively when moving up and down in the adjusting sleeve 2, resulting in excessive extrusion of the sealing surface, and ensuring the sealing reliability of the valve.

[0023] The embodiments should not be construed as limiting the present invention. Any non-creative improvement based on the spirit of the present invention should be regarded as within the protection scope of the present invention.

Claims

1. A high-precision electric regulating valve, comprising a valve body, the valve body is provided with an inlet channel and an outlet channel, the valve body is provided with a valve cover, the valve body is provided with an adjusting sleeve, a valve core, and a valve stem, the valve core is connected to the valve stem, the upper end of the valve stem extends out of the valve cover and is connected to the electric actuator, the valve core moves up and down in the adjusting sleeve, the inner wall of the adjusting sleeve is provided with a sealing surface that forms a sealing match with the valve core, and the side of the adjusting sleeve is provided with an adjusting hole, characterized in that: The lower end of the regulating sleeve extends to the inlet channel, a plurality of throttling holes are arranged at the bottom of the regulating sleeve, the throttling holes communicate with the inlet channel and the inner cavity of the regulating sleeve, and a slow flow mechanism is arranged in the regulating sleeve.

2. A high-precision electric regulating valve according to claim 1, characterized in that: The flow slowing mechanism comprises a base, a plurality of flow guide blades are arranged on the base, a mounting column is arranged at the bottom of the adjustment sleeve, and the base is mounted on the mounting column through a nut and can rotate freely around the mounting column.

3. A high-precision electric regulating valve according to claim 2, characterized in that: A bearing is arranged between the base and the bottom of the adjusting sleeve.

4. A high-precision electric regulating valve according to claim 1, characterized in that: The throttle hole comprises a first oblique portion and a second oblique portion, wherein the central axis of the first oblique portion and the central axis of the second oblique portion form an angle of 90°.

5. The high-precision electric regulating valve according to claim 1, characterized in that: A sealing gasket is arranged between the adjusting sleeve and the valve body, and a sealing gasket is arranged between the adjusting sleeve and the valve cover.

6. A high-precision electric regulating valve according to claim 1, characterized in that: A packing assembly is provided between the valve cover and the valve stem, and the packing assembly includes packing, a packing pressure plate, and a packing pressure cover. The packing pressure cover is connected to the valve cover by bolts to compress the packing pressure plate and further compress the packing.

7. A high-precision electric regulating valve according to claim 1, characterized in that: A bracket is arranged between the valve cover and the electric actuator, a travel scale is arranged on the bracket, and a travel pointer is arranged on the valve stem.

8. The high-precision electric regulating valve according to claim 1, characterized in that: The inner wall of the regulating sleeve is provided with a limiting inclined surface, and the outer surface of the valve core is provided with a limiting protrusion matched with the limiting inclined surface.

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