Electric control valve

Abstract

The utility model discloses an electric regulating valve, which relates to the technical field of valves, and comprises a valve body, a valve cover is arranged on the valve body, a valve seat, a valve core and a valve rod are arranged in the valve body, a regulating sleeve is arranged between the valve core and 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 electric actuating mechanism is connected with the regulating sleeve. An adjusting hole is formed in the lower portion of the adjusting sleeve and extends in the circumferential direction of the adjusting sleeve, the adjusting hole is formed by a transverse edge, an arc edge and a vertical edge in a surrounding mode after the arc of the adjusting sleeve is unfolded, and the area, allowing media to pass through, of the adjusting hole is gradually reduced from top to bottom. The adjusting device is coherent in adjusting curve and high in adjusting precision.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an electric regulating valve. Background Art

[0002] Electric control valves are important actuator instruments in industrial automation process control. With the increasing degree of automation in the industrial field, they are being used more and more in various industrial production fields. The existing electric control valves control the flow or pressure downstream of the valve by setting a number of adjustment holes arranged in an array on the adjustment sleeve and covering the area of ​​the adjustment holes with the valve core. Due to the gaps between the adjustment holes, the adjustment curve of this structure is not continuous and the adjustment accuracy is low. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides an electric regulating valve.

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

[0005] An electric regulating valve comprises a valve body, a valve cover is provided on the valve body, a valve seat, a valve core and a valve stem are provided in the valve body, an adjusting sleeve is provided between the valve core and the valve body, 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 an electric actuator, an adjusting hole is provided at the lower part of the adjusting sleeve, the adjusting hole extends circumferentially along the adjusting sleeve, and the adjusting hole is surrounded by a horizontal side, a circular arc side and a vertical side after the circular arc of the adjusting sleeve is expanded, and the area of ​​the adjusting hole through which the medium can pass gradually decreases from top to bottom.

[0006] There are several adjusting holes and the adjusting sleeves are completely laid.

[0007] The valve core moves up and down in the adjusting sleeve. The inner wall of the adjusting sleeve is provided with a limiting inclined surface. The outer surface of the valve core is provided with a limiting protrusion matched with the limiting inclined surface.

[0008] The lower end of the valve stem is connected to the valve core through a nut, and a spring pad is arranged between the nut and the valve core.

[0009] 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.

[0010] The valve body is provided with a step mounting portion corresponding to the valve seat, a groove is provided on the outer side of the valve seat, a spring is provided in the groove, one end of the spring presses against the bottom of the groove, and the other end presses against the step mounting portion.

[0011] A sealing gasket is provided between the valve seat and the step mounting portion.

[0012] The valve cover is detachably connected to the valve body via bolts, and a sealing gasket is provided between the valve cover and the valve body.

[0013] A packing assembly is provided between the valve cover and the valve stem. 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.

[0014] The beneficial effects of the utility model are as follows: the utility model provides an adjustment hole at the lower part of the adjustment sleeve, which is surrounded by a horizontal side, an arc side and a vertical side after the adjustment sleeve is expanded along the arc. The flow rate or pressure downstream of the valve is controlled by covering the area of ​​the adjustment hole with the valve core. The adjustment curve is continuous and the adjustment accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0016] Figure 2 It is a partial arc expansion diagram of the adjustment sleeve of the embodiment of the utility model;

[0017] Figure 3 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0018] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0019] like Figure 1 As shown, an electric regulating valve comprises a valve body 1, a valve cover 2 is arranged on the valve body 1, a valve seat 5, a valve core 4, and a valve stem 6 are arranged in the valve body 1, an adjusting sleeve 3 is arranged between the valve core 4 and the valve body 1, the lower end of the valve stem 6 is connected to the valve core 4 through a nut 16, a spring pad 15 is arranged between the nut 16 and the valve core 4, and when the valve stem 6 drives the valve core 4 to move up and down, the spring pad 15 can provide a certain buffer, and the upper end of the valve stem 6 extends out of the valve cover 2 and is connected to the electric actuator 12. A limiting inclined surface 13 is arranged on the inner wall of the regulating sleeve 3, and a limiting protrusion 14 matching the limiting inclined surface 13 is arranged on the outer surface of the valve core 4, so that the valve core 4 will not move down excessively when moving up and down in the regulating sleeve 3. A bracket is arranged between the valve cover 2 and the electric actuator 12, and a travel scale 10 is arranged on the bracket. A travel pointer 11 is arranged on the valve stem 6, which is used to indicate the movement stroke of the valve stem so as to judge the opening of the valve and realize precise adjustment.

[0020] like Figure 2As shown, the lower part of the adjusting sleeve 3 is provided with an adjusting hole 31, and the adjusting hole 31 extends along the circumference of the adjusting sleeve 3. After the adjusting sleeve 3 is expanded, the adjusting hole 31 is surrounded by a horizontal side 32, an arc side 34, and a vertical side 33. The area of ​​the adjusting hole 31 for the medium to pass through gradually decreases from top to bottom. The valve core 4 moves up and down in the adjusting sleeve 3 to cover the area of ​​the adjusting hole to control the flow or pressure downstream of the valve. The adjusting curve is continuous and the adjusting accuracy is high. Furthermore, there are several adjusting holes 31 and the adjusting sleeve 3 is completely laid, so that the impact force of the medium on the adjusting sleeve 3 is relatively uniform, avoiding uneven force causing the adjusting sleeve to deviate and affect the adjusting accuracy.

[0021] like Figure 3 As shown, the valve body 1 is provided with a step mounting portion 21 corresponding to the valve seat, a groove 51 is provided on the outside of the valve seat 5, a spring 22 is provided in the groove 51, one end of the spring 22 presses against the bottom of the groove 51, and the other end presses against the step mounting portion 21, so that the sealing surface of the valve core can fit closely with the valve seat after the valve core moves downward, thereby ensuring the sealing of the valve. Furthermore, a sealing gasket 23 is provided between the valve seat 5 and the step mounting portion 21 to prevent the medium from leaking from the fitting between the valve seat 5 and the valve body 1.

[0022] In this embodiment, the valve cover 2 and the valve body 1 are detachably connected by bolts, which is convenient for the installation and subsequent maintenance and repair of the valve. A sealing gasket is provided between the valve cover 2 and the valve body 1 to prevent the medium from leaking from the fitting between the valve cover 2 and the valve body 1.

[0023] In this embodiment, a packing assembly is provided between the valve cover 2 and the valve stem, and the packing assembly includes a packing 7, a packing pressure plate 8, and a packing pressure cover 9. The packing pressure cover 9 is connected to the valve cover 2 by bolts to compress the packing pressure plate 8, and then compress the packing 7 to prevent the medium from leaking from the gap between the valve cover 2 and the valve stem 6, thereby ensuring the reliability of the seal.

[0024] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. An electric regulating valve, comprising a valve body, a valve cover is arranged on the valve body, a valve seat, a valve core and a valve stem are arranged in the valve body, an adjusting sleeve is arranged between the valve core and the valve body, the valve core is connected to the valve stem, and the upper end of the valve stem extends out of the valve cover and is connected to the electric actuator, characterized in that: An adjusting hole is provided at the lower part of the adjusting sleeve, and the adjusting hole extends circumferentially along the adjusting sleeve. When the adjusting sleeve is unfolded, the adjusting hole is surrounded by a horizontal side, an arc side, and a vertical side. The area of ​​the adjusting hole through which the medium can pass gradually decreases from top to bottom.

2. The electric regulating valve according to claim 1, characterized in that: There are several adjusting holes and the adjusting sleeves are completely laid.

3. The electric regulating valve according to claim 1, characterized in that: The valve core moves up and down in the adjusting sleeve, the inner wall of the adjusting 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.

4. The electric regulating valve according to claim 1, characterized in that: The lower end of the valve stem is connected to the valve core through a nut, and a spring pad is arranged between the nut and the valve core.

5. The 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.

6. The electric regulating valve according to claim 1, characterized in that: The valve body is provided with a step mounting portion corresponding to the valve seat, a groove is provided on the outer side of the valve seat, a spring is provided in the groove, one end of the spring presses against the bottom of the groove, and the other end presses against the step mounting portion.

7. The electric regulating valve according to claim 6, characterized in that: A sealing gasket is provided between the valve seat and the step mounting portion.

8. The electric regulating valve according to claim 1, characterized in that: The valve cover is detachably connected to the valve body via bolts, and a sealing gasket is provided between the valve cover and the valve body.

9. The 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.

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