Differential spiral anti-channeling device for valve rod of eccentric ball valve

Abstract

The utility model discloses a differential spiral anti-channeling device for a valve rod of an eccentric ball valve. The differential spiral anti-channeling device comprises a lower valve rod, an adjusting piece and a tail cover, the lower valve rod is arranged in the valve body, and the upper end is connected with the ball core; the adjusting piece is arranged at the lower end of the lower valve rod, and the adjusting piece is connected with the lower valve rod through a differential screw; the lower end of the differential screw is fixed through a set screw; the tail cover is connected with the valve body, and the adjusting piece and the set screw are packaged in the valve body. The whole space of the valve is shortened, no support is used for connection, the executing mechanism is directly connected with the valve body, stability is improved, and cost is reduced. The differential screw mechanism can finely adjust the position of the ball core, better centering is achieved during assembly, and sealing of the valve seat and the ball core is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of control valves, and particularly relates to a control valve for preventing the stem of an eccentric semi-spherical valve from moving axially. Background Technique

[0002] Eccentric ball valves are often used for regulation and switching in control valve applications. Since an eccentric semi-spherical valve has only one seat seal compared with a traditional O-shaped ball valve, after the valve is opened, the ball core will be subjected to an upward or downward axial unbalanced force due to the action of the medium. The valve stem requires an anti-creeper device to effectively solve the problem of axial movement. The traditional anti-creeper device has a complex structure. Specifically, as shown in Figure 1 and Figure 2 The horizontal plate in the middle of the bracket supports the upper and lower bearings. The round nut is connected to the valve stem. The bearings are fixed by tightening the round nut to ensure that the valve stem does not move axially up and down. However, when the round nut is tightened, the bearings are subject to large frictional forces, which will affect the rotation of the valve stem. When the round nut is loose, there is an axial gap, and effective anti-creeper cannot be achieved. Summary of the Utility Model

[0003] The utility model provides a differential screw anti-creeper device for the valve stem of an eccentric ball valve, aiming to solve one of the technical problems: the technical problem that the existing anti-creeper device has a poor anti-creeper effect.

[0004] Considering the above problems of the existing technology, according to one aspect disclosed by the utility model, the utility model adopts the following technical solutions:

[0005] A differential screw anti-creeper device for the valve stem of an eccentric ball valve, characterized by comprising:

[0006] A lower valve stem, which is arranged in the valve body and is connected to the ball core at the upper end;

[0007] An adjusting member, which is arranged at the lower end of the lower valve stem and is connected to the lower valve stem through a differential screw; the lower end of the differential screw is fixed by a set screw;

[0008] A tail cover, which is connected to the valve body and encapsulates the adjusting member and the set screw in the valve body.

[0009] In order to better implement the utility model, the further technical solution is:

[0010] Further, the upper end of the lower valve stem is connected to the ball core through a taper pin nut.

[0011] Further, a sliding bearing is arranged between the lower valve stem and the valve body.

[0012] Further, a split ring is clamped between the adjusting member and the valve body.

[0013] Furthermore, a gasket and a second gasket are respectively arranged on the upper side and the lower side of the split ring.

[0014] Furthermore, the adjusting member and the lower valve stem are matched with each other in a flat square shape.

[0015] Furthermore, a sealing gasket is arranged between the tail cover and the valve body.

[0016] Compared with the prior art, one of the beneficial effects of the utility model is:

[0017] The utility model discloses an eccentric ball valve stem differential spiral anti-slip device, which shortens the overall valve space, has no bracket connection, and adopts direct connection between the actuator and the valve body, thereby improving stability and reducing costs; the differential spiral mechanism can fine-tune the position of the ball core, and better centering during assembly ensures the sealing of the valve seat and the ball core; the differential spiral mechanism rotates synchronously with the valve stem, has a set screw to prevent loosening, and adopts split ring positioning, which will not loosen and affect the movement of the valve stem. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application document or the technical solutions in the prior art, the drawings required for use in the description of the embodiments or the prior art are briefly introduced below. Obviously, the drawings described below are only references to some embodiments in the present application document. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a traditional anti-channeling device.

[0020] Figure 2 for Figure 1 An enlarged schematic diagram of point B.

[0021] Figure 3 The figure is a schematic structural diagram of a differential spiral anti-slip device for an eccentric ball valve stem according to an embodiment of the utility model.

[0022] Figure 4 for Figure 3 An enlarged schematic diagram of point A.

[0023] The names of the drawings corresponding to the reference numerals are:

[0024] 1-valve body, 2-ball core, 3-tail cover, 4-sealing gasket, 5-gasket, 6-split ring, 7-second gasket, 8-, 9-sliding bearing, 10-differential screw, 11-adjusting part, 12-setting screw, 13-taper pin nut, 14-upper valve stem, 15-actuator. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the embodiments, but the implementation manner of the present invention is not limited thereto.

[0026] See also Figure 3 , Figure 4 As shown, a differential spiral anti-slip device for an eccentric ball valve stem includes a lower stem 9, an adjusting member 11 and a tail cover 3; the lower stem 9 is arranged in a valve body 1, and the upper end is connected to the ball core 2; the adjusting member 11 is arranged at the lower end of the lower stem 9, and the adjusting member 11 is connected to the lower stem 9 by a differential screw 10; the lower end of the differential screw 10 is fixed by a set screw 12; the tail cover 3 is connected to the valve body 1, and the adjusting member 11 and the set screw 12 are encapsulated in the valve body 1. The upper stem 14 is connected to the upper ball core 2, and the actuator 15 is connected to the upper stem 14.

[0027] The upper end of the lower valve stem 9 can be preferably connected to the ball core 2 through a cone pin nut 13. And a sliding bearing 8 can be arranged between the lower valve stem 9 and the valve body 1.

[0028] A split ring 6 can be inserted between the adjusting member 11 and the valve body 1 , and a gasket 5 and a second gasket 7 are respectively arranged on the upper side and the lower side of the split ring 6 . A sealing gasket 4 is arranged between the tail cover 3 and the valve body 1 .

[0029] The adjusting member 11 and the lower valve stem 9 can be matched with each other in a flat square.

[0030] Principle of use: The ball core 2 and the lower valve stem 9 are locked by the cone pin nut 13 to form an integral part. The adjusting part 11 and the lower valve stem 9 are connected by the differential screw 10. The threads at both ends of the differential screw 10 have the same rotation direction and different pitches. The position of the lower valve stem 9 can be adjusted by rotating the differential screw 10 to determine the center position of the ball core 2. The set screw 12 supports the differential screw 10 to prevent loosening. Then the sealing gasket 4, the first gasket 5, the second gasket 7 and the split ring 6 are compressed by the tail cover 3. The rotation of the lower valve stem 9 drives the ball core 2 to open and close, and at the same time rotates with the adjusting part 11 with a flat square. The split ring 6 plays a positioning role and prevents the valve stem from moving.

[0031] In summary, the utility model uses a differential screw mechanism to adjust the position, which can fine-tune the center position of the ball core. The adjustment piece and the lower valve stem are matched with a flat square, which can be axially moved and adjusted, and can also rotate synchronously. The split ring is positioned, easy to install, and has a good positioning effect.

[0032] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0033] As used herein, the terms "one embodiment", "another embodiment", "embodiment", etc. refer to specific features, structures, or characteristics described in connection with that embodiment being included in at least one embodiment generally described in this application. The same expression occurring in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure, or characteristic in connection with any embodiment, it is intended that the implementation of such feature, structure, or characteristic in combination with other embodiments also fall within the scope of the present utility model.

[0034] Although the present utility model has been described herein with reference to various illustrative embodiments of the present utility model, it should be understood that those skilled in the art can devise many other modifications and embodiments that will fall within the scope of the principles disclosed in this application. More specifically, within the scope of the disclosure and claims of this application, various variations and improvements can be made to the components and / or layout of the subject combination layout. In addition to the variations and improvements to the components and / or layout, other uses will also be apparent to those skilled in the art.

Claims

1. An eccentric ball valve stem differential screw anti-displacement device, characterized in that Comprising: A lower valve stem (9) which is arranged inside the valve body (1) and has its upper end connected to the ball core (2); An adjusting member (11) which is arranged at the lower end of the lower valve stem (9) and is connected to the lower valve stem (9) by a differential screw (10); the lower end of the differential screw (10) is fixed by a set screw (12); A tail cover (3) which is connected to the valve body (1) and encapsulates the adjusting member (11) and the set screw (12) inside the valve body (1).

2. The differential screw anti-displacement device for the eccentric ball valve stem according to claim 1, characterized in that The upper end of the lower valve stem (9) is connected to the ball core (2) by a taper pin nut (13).

3. The eccentric ball valve stem differential spiral anti-slip device according to claim 1 is characterized in that A sliding bearing (8) is arranged between the lower valve stem (9) and the valve body (1).

4. The eccentric ball valve stem differential spiral anti-slip device according to claim 1 is characterized in that An split ring (6) is snapped between the adjusting member (11) and the valve body (1).

5. The eccentric ball valve stem differential spiral anti-slip device according to claim 4 is characterized in that A gasket (5) and a second gasket (7) are respectively arranged on the upper side and the lower side of the split ring (6).

6. The eccentric ball valve stem differential spiral anti-slip device according to claim 1, characterized in that The adjusting member (11) and the lower valve stem (9) adopt a flat square fit.

7. The differential screw anti-creeper device for the eccentric ball valve stem according to claim 1, characterized in that A sealing gasket (4) is arranged between the tail cover (3) and the valve body (1).

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