Limit adjusting mechanism for electric actuator of angular travel valve

Abstract

The utility model provides an angular travel valve electric actuator limit adjusting mechanism which comprises a shell, a through hole is formed in the shell, a thread part and a first smooth wall part are arranged in the shell, the thread part and the smooth wall part form a ring in a surrounding mode, and the inner diameter of the thread part is smaller than that of the first smooth wall part; the bolt comprises a locking part and a sliding part, the bolt can extend into the through hole, when the threaded part corresponds to the sliding part, the bolt can be inserted into the shell along the through hole, and when the bolt rotates around the axis of the bolt, the locking part can be in threaded connection with the threaded part; the locking nut is in threaded connection with the bolt, and the end face of the locking nut can abut against the end face of the threaded part. According to the utility model, the intermittent threads and the smooth wall structure are adopted to enable the hole to be matched with the bolt, so that the bolt is directly inserted into the hole to reach a preset position in a preset posture, then the axial position of the bolt is determined by rotating a certain angle, and the bolt is prevented from freely rotating through the locking nut; quick installation and adjustment of the bolt are completed, and the installation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the field of automatic control of valves, and particularly relates to a limit adjusting mechanism for an electric actuator of an angular stroke valve. Background Art

[0002] In an electric actuator, in order to prevent the motor from controlling the valve to rotate excessively, a limit device is used to limit the displacement or rotation limit position of the internal mechanism. Through structures such as limit blocks, collisions occur with the moving parts, causing the device to stop working, thereby preventing the valve plate of the valve from directly colliding with the limit position, resulting in deformation of the valve structure, reducing the sealing effect of the valve, and shortening the service life of the valve. Moreover, in an angular stroke valve, restricting the excessive rotation of the mechanism can also prevent the valve ball or valve plate from rotating excessively, causing the valve to be unable to completely block or open the pipeline, affecting the flow of the medium in the pipeline. In the installation and debugging process of existing angular stroke valves, a limit mechanism usually consists of two bolts. Corresponding blocks are arranged on the rotating mechanism to cooperate with the two bolts to limit the rotation angle of the mechanism. In the installation and debugging process of the above mechanism, only by rotating the bolts can the actual working length of the bolts be adjusted. However, before the bolts reach the predetermined position, there is a relatively long distance. The installation and debugging personnel can only install by rotating the bolts, which reduces the installation efficiency. Summary of the Utility Model

[0003] In view of this, the utility model aims to provide a limit adjusting mechanism for an electric actuator of an angular stroke valve to facilitate the installation of the adjusting mechanism.

[0004] To achieve the above object, the technical solution of the utility model is realized as follows:

[0005] A limit adjusting mechanism for an electric actuator of an angular stroke valve, comprising

[0006] A housing, on which a through hole is opened. A threaded portion and a first smooth wall portion are arranged in the through hole, and the threaded portion and the smooth wall portion surround to form a ring, and the inner diameter of the threaded portion is smaller than the inner diameter of the first smooth wall portion;

[0007] A bolt, which includes a locking portion and a sliding portion, and the bolt can extend into the through hole. When the threaded portion corresponds to the sliding portion, the bolt can move along its own axis in the through hole. When the bolt rotates around its own axis, the bolt can be screwed with the threaded portion through the locking portion;

[0008] A locking nut, which is screwed with the bolt, and the end face of the locking nut can abut against the end face of the threaded portion.

[0009] Furthermore, the sliding portion is a plane.

[0010] Further, a second smooth wall portion is formed on the inner wall of the lock nut, and the second smooth wall portion can correspond to the locking portion of the bolt, enabling the nut to move along the axial direction of the bolt.

[0011] Further, the position-limiting adjustment mechanism further includes a sleeve, and the threaded portion and the first smooth wall portion are distributed on the inner wall of the sleeve.

[0012] Further, one end of the sleeve extends outward to form a flange, and the other end is screwed with a nut, and the nut and the flange can clamp the shell wall of the housing.

[0013] Further, the flange is polygonal, and a blind hole corresponding to the flange is formed on the housing, and the flange can be placed in the blind hole.

[0014] Further, the end of the bolt is hemispherical.

[0015] Further, the position-limiting adjustment mechanism further includes a position-limiting member, and the position-limiting member can rotate around the axis of the valve stem of the angular travel valve. The position-limiting member extends outward with at least one position-limiting post, and when the position-limiting member rotates to the limit position, the position-limiting post can abut against the end of the bolt.

[0016] Compared with the prior art, the angular travel valve electric actuator position-limiting adjustment mechanism of the present invention has the following advantages:

[0017] The present invention adopts a discontinuous thread and a smooth wall structure to make the hole cooperate with the bolt. During the installation process, the bolt can be directly inserted into the hole in a predetermined posture to reach near the predetermined position, and then the axial position of the bolt is determined by rotating a certain angle. After that, the lock nut is used to prevent the bolt from rotating freely, thereby completing the rapid installation and adjustment of the bolt, and improving the installation efficiency of the adjustment mechanism;

[0018] By setting the sliding portion as a plane, it is convenient to transmit torque through the sliding portion during the screwing process;

[0019] By adopting the method of arranging a sleeve on the through hole of the housing, the casting precision of the through hole of the housing is reduced, and the production difficulty is reduced;

[0020] By adopting the method of arranging a polygonal flange at the end of the sleeve and cooperating with the polygonal blind hole on the housing, the sleeve is prevented from rotating freely when stressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 It is a schematic external view of the position-limiting adjustment structure;

[0023] Figure 2 Schematic top view of the limit adjustment structure;

[0024] Figure 3 Exploded view of the limit adjustment structure;

[0025] Figure 4 Schematic diagram of the sleeve structure in Embodiment 2;

[0026] Figure 5 Schematic diagram of the bolt structure;

[0027] Figure 6 Schematic diagram of the lock nut structure.

[0028] Explanation of the reference numerals:

[0029] 1 - housing; 11 - through hole; 12 - adjustment surface; 2 - limiting member; 21 - limiting post; 3 - sleeve; 31 - threaded portion; 32 - first smooth wall portion; 33 - flanging; 34 - nut; 4 - bolt; 41 - sliding portion; 42 - locking portion; 5 - lock nut; 51 - second smooth wall portion. Detailed implementation manners

[0030] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0034] Embodiment 1

[0035] The angular travel valve electric actuator limit adjustment mechanism of the present utility model includes

[0036] A housing 1, which houses the transmission mechanism of the electric actuator. A rotating shaft connected to the valve stem of the valve passes through the housing 1 and is located below the housing 1. One side of the housing 1 is provided with an adjustment surface 12. Two parallel through holes 11 are opened on the adjustment surface 12. A plurality of threaded portions 31 and a plurality of first smooth wall portions 32 are opened inside the through holes 11, and the threaded portions 31 and the first smooth wall portions 32 are arranged at intervals. At the same time, a plurality of threaded portions 31 and the first smooth wall portions 32 surround to form a ring, and the inner diameter of the threaded portion 31 is smaller than the inner diameter of the first smooth wall portion 32 through a plurality of first threads. A bolt 4 can be inserted into each ring formed by each threaded portion 31 and the first smooth wall portion 32. The side wall of the bolt 4 includes a plurality of locking portions 42 and a plurality of sliding portions 41. External threads are provided at the locking portions 42, and the sliding portions 41 are smooth surfaces, and the locking portions 42 and the sliding portions 41 are arranged at intervals. The number of the locking portions 42, the sliding portions 41, the threaded portions 31, and the first smooth wall portions 32 is the same. In this embodiment, each part is provided with four respectively. The number of the locking portions 42, the sliding portions 41, the threaded portions 31, and the first smooth wall portions 32 is the same. The width of the locking portions 42 and the threaded portions 31 is less than or equal to the width of the first smooth wall portions 32 and the sliding portions 41. During the use process, when the sliding portion 41 of the screw rod faces the first smooth wall portion 32 and the locking portion 42 faces the threaded portion 31, the screw rod can directly move axially along itself inside the through hole 11, so that the screw rod can be quickly inserted into the housing. And after the screw rod is inserted to a predetermined depth, rotate the screw rod so that the locking portion 42 of the screw rod is screwed with the threaded portion 31, thereby restricting the axial movement of the screw rod. At this time, rotate the screw rod as needed, and the length of the screw rod extending into the housing 1 can be finely adjusted. In this embodiment, the fine adjustment length is 1 / 4 of a pitch. In other embodiments, the fine adjustment length can be changed by changing the number and arc length of the locking portions 42. Those skilled in the art can design and produce according to actual needs.

[0037] A locking nut 5 is screwed to the bolt 4, and the end face of the locking nut 5 can abut against the end face of the threaded portion 31, so that the bolt 4 is fixed to the housing, preventing the bolt 4 from loosening due to the gap between the screw teeth. In this embodiment, in order to improve the installation efficiency, a second smooth wall portion 51 is provided on the inner wall of the locking nut 5, and the second smooth wall portion 51 can correspond to the locking portion 42 of the bolt 4, and the nut 34 is moved along the axial direction of the bolt 4, so that the locking nut 5 can quickly move to the vicinity of the housing and then rotate the locking nut 5 to complete the locking work of the bolt 4.

[0038] In the angular travel valve electric actuator limit adjusting mechanism of the present invention, a limit member 2 is further provided in the housing. The limit member 2 can rotate around the axis of the valve stem of the angular travel valve. At least one limit post 21 extends outward from the limit member 2. In this embodiment, there are two limit posts 21, and an included angle is provided between the two limit posts 21. When the motor or handwheel of the electric actuator drives the valve stem to rotate to two preset extreme positions through the transmission mechanism, the two limit posts 21 respectively abut against the ends of the two bolts 4, thereby limiting the rotation angle of the valve stem.

[0039] During the rotation of the bolt 4, in order to facilitate the transmission of torque, the sliding portion 41 is a plane, and related tools such as a wrench can be connected through the sliding portion 41 to transmit torque.

[0040] In order to prevent the bolt 4 with edges and corners from affecting the rotation angle of the limit post 21 due to its different postures, the end portions of each bolt 4 extending into the housing 1 are respectively provided as hemispherical.

[0041] Embodiment 2

[0042] The difference from Embodiment 1 is that the hole wall of the through hole 11 on the housing 1 is a smooth wall, and a sleeve 3 is inserted into the through hole 11. The threaded portion 31 and the first smooth wall portion 32 are distributed on the inner wall of the sleeve 3, thereby reducing the precision requirements for casting the housing 1. One end of the sleeve 3 extends outward to form a flange 33, and the other end is screwed to a nut 34 (the external thread at the end of the sleeve is hidden for easy display). The shell wall of the housing 1 is clamped by the flange 33 and the nut 34 to prevent the sleeve 3 from loosening.

[0043] Optionally, in order to further prevent the sleeve 3 from rotating when stressed, the flange 33 can be set as a polygon, and a polygon blind hole (not shown in the figure) is opened at the corresponding position of the housing 1, and the flange 33 can be embedded in the blind hole.

[0044] In addition to the above installation method of the sleeve 3 and the housing 1, the sleeve 3 can also be installed in the through hole 11 of the housing 1 by an embedding method.

[0045] It should be noted that, in order to clearly show the main structure to be protected by the present utility model, the internal structures of the electric actuator such as the motor, the handwheel and the related transmission structures are omitted in the drawings of this application. However, those skilled in the art should know how to arrange the various components in the electric actuator.

[0046] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An angular travel valve electric actuator limit adjustment mechanism, characterized in that: Comprising a housing having two parallel through holes formed therein, each through hole being provided with a threaded portion and a first smooth wall portion, and the threaded portion and the first smooth wall portion surrounding to form a ring, and the inner diameter of the threaded portion being smaller than the inner diameter of the first smooth wall portion; a bolt including a locking portion and a sliding portion, the bolt being capable of extending into the through hole, and when the threaded portion corresponds to the sliding portion, the bolt being capable of being inserted into the housing along the through hole, and when the bolt rotates about its own axis, the bolt being capable of being screwed with the threaded portion through the locking portion; a lock nut screwed with the bolt, and the end face of the lock nut being capable of abutting against the end face of the threaded portion.

2. The angular travel valve electric actuator limit adjustment mechanism according to claim 1, wherein: The sliding portion is a plane.

3. The angular travel valve electric actuator limit adjustment mechanism according to claim 1, characterized in that: The threaded portion and the plurality of first smooth wall portions are respectively plural and are arranged at intervals.

4. A limit adjusting mechanism for an angular travel valve electric actuator according to claim 1, characterized in that: The inner wall of the lock nut is provided with a second smooth wall portion, and the second smooth wall portion can correspond to the locking portion of the bolt and enable the nut to move axially along the bolt.

5. A limit adjustment mechanism for an angular travel valve electric actuator according to claim 1, characterized in that: It further includes a sleeve, and the threaded portion and the first smooth wall portion are distributed on the inner wall of the sleeve.

6. A limit adjustment mechanism for an angular travel valve electric actuator according to claim 5, characterized in that: One end of the sleeve extends outwards to form a flange, and the other end is screwed with a nut, and the nut and the flange can clamp the shell wall of the housing.

7. A limit adjustment mechanism for an angular travel valve electric actuator according to claim 6, characterized in that: The flange is polygonal, and a blind hole corresponding to the flange is formed in the housing, and the flange can be placed in the blind hole.

8. A limit adjusting mechanism for an angular travel valve electric actuator according to claim 1, characterized in that: The end of the bolt is hemispherical.

9. A limit adjustment mechanism for an angular travel valve electric actuator according to claim 1, characterized in that: It further includes a limiting member, the limiting member being capable of rotating about the axis of the valve stem of the angular stroke valve, the limiting member extending outwards at least one limiting post, and when the limiting member rotates to the limit position, the limiting post can abut against the end of the bolt.

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