Limiting screw sealing structure for valve actuating mechanism

Abstract

The utility model provides a stop screw sealing structure for a valve actuating mechanism, which comprises a rack and a stop screw arranged on the rack, one end of the rack is provided with a threaded hole matched with the stop screw, the other end of the rack is provided with an assembly hole for accommodating the stop screw, the assembly hole is communicated with the threaded hole, and the stop screw is arranged on the rack. One end of the limiting screw sequentially penetrates through the assembling hole and the threaded hole, the other end of the limiting screw is provided with a limiting assembly, and a sealing assembly used for blocking the assembling hole is arranged at the position, corresponding to the assembling hole, of the limiting screw. The limiting screw sealing structure for the valve actuating mechanism has the advantages of being simple in structure, easy to assemble, stable, reliable, good in applicability and high in durability, can be suitable for being used for assembling indoor and outdoor valve actuating mechanisms, has good sealing performance and is convenient to use and adjust.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a limit screw sealing structure for a valve actuator. Background Art

[0002] When a valve actuator is used for on-off butterfly valves, ball valves and other angular stroke valves or similar devices, multiple bosses similar to jaw couplings are often arranged on the gear installed at the end of the output shaft (the last few gears near the output end of the transmission gear set). The multiple bosses are spaced according to the stroke angle required for the action. At the same time, two limit screw holes are opened in the frame (box body), and a limit screw is installed in each hole. The limit screw and the boss are on the same horizontal plane. For example, for a 180° rotation on-off action, two bosses are arranged on the gear, and the angular interval between the bosses is 180°. At the starting position, the side surface of one of the bosses contacts the end of the limit screw, so that the valve actuator can only rotate in the opposite direction. After rotating 180°, the side surface of the boss on the gear contacts the end of the limit screw, preventing the actuator from continuing to rotate, thus achieving the purpose of controlling the working stroke. At the same time, since the gear set in the frame is often coated with grease, in order to prevent the grease from leaking out and external dust from invading, there is a sealing requirement for the joint surface between the limit screw and the frame. In addition, during assembly or debugging, since the frame is a closed structure, it is difficult for users to judge whether the limit screw is screwed in place (the end of the limit screw is in full contact with the side surface of the boss). Therefore, the screwing depth of the limit screw needs to be adjusted during assembly and debugging.

[0003] However, the existing limit screw sealing structure usually installs a gasket on the joint surface between the frame and the limit screw. The inner ring of the gasket is provided with threads, and the gasket is threadedly connected with the limit screw. After the limit screw is screwed into the threaded hole of the frame, the gasket will be compressed, so that the gasket is extruded and deformed to fill the gap between the frame and the limit screw joint surface, thereby achieving the function of isolating and sealing the inside of the frame from the outside. At the same time, the end of the limit screw can contact the rest of the structure inside the frame to play a limiting role.

[0004] Although the existing limit screw sealing structure can achieve the sealing effect, it has certain limitations in practical applications. First of all, the gasket is exposed to the air. For outdoor use scenarios, the gasket ages under long-term sunlight irradiation, losing its sealing performance and shortening its service life. Secondly, during the assembly process, it is impossible to accurately grasp the screwing depth of the limit screw, and it is impossible to well control the deformation amount of the gasket to achieve the sealing effect, making the installation inconvenient. At the same time, the sealing effect of this limit screw is ensured by the extrusion deformation of the gasket. Therefore, the screwing depth of the limit screw is not adjustable. As can be seen from the above, the existing technology has obvious deficiencies in terms of installation convenience and durability, and urgent improvement is needed. Summary of the Utility Model

[0005] In view of this, the present utility model aims to propose a limit screw sealing structure for a valve actuator to solve the problems of poor installation convenience and durability of the existing limit screw sealing structure.

[0006] To achieve the above object, the technical solution of the present utility model is realized as follows:

[0007] A limit screw sealing structure for a valve actuator includes a frame and a limit screw provided on the frame. One end of the frame is provided with a threaded hole for cooperating with the limit screw, and the other end is provided with an assembly hole for accommodating the limit screw. The assembly hole is communicated with the threaded hole, and the aperture of the assembly hole is larger than that of the threaded hole. One end of the limit screw sequentially passes through the assembly hole and the threaded hole, and the other end is provided with a limit assembly. A sealing assembly for blocking the assembly hole is provided at a position corresponding to the assembly hole on the limit screw.

[0008] Further, the sealing assembly includes a sealing ring provided on the limit screw. The sealing ring is coaxially arranged with the limit screw, and an annular groove for cooperating with the sealing ring is provided on the limit screw.

[0009] Further, a pair of limit rings are provided at positions corresponding to the left and right ends of the sealing ring on the limit screw. Each limit ring is coaxially arranged with the limit screw. The inner side of the limit ring is fixed on the limit screw, and the outer side is in clearance fit with the assembly hole. A limit gap for cooperating with the sealing ring exists between the two limit rings, and the limit gap is communicated with the annular groove.

[0010] Further, at least one group of the sealing assemblies is arranged along the length direction of the limit screw.

[0011] Further, the limit assembly includes a locking nut provided on the limit screw, and the outer diameter of the locking nut is larger than the aperture of the assembly hole.

[0012] Further, the limit assembly further includes a flat washer ring provided on the limit screw corresponding to the position between the frame and the locking nut. The outer diameter of the flat washer ring is larger than the outer diameter of the locking nut. One end of the flat washer ring abuts against the locking nut, and the other end abuts against the frame.

[0013] Further, a recessed portion for facilitating the assembly of the limit screw is provided at a position corresponding to the assembly hole on the frame.

[0014] Compared with the prior art, the limit screw sealing structure for a valve actuator of the present utility model has the following advantages:

[0015] A limit screw sealing structure for a valve actuator according to the present utility model has the advantages of simple structure, easy assembly, stability and reliability, good applicability, and high durability. It can be applied to the assembly of indoor and outdoor valve actuators, has good sealing performance, and is convenient to use and adjust. By placing the sealing component in the assembly hole of the frame, the influence of external environments such as sunlight on the sealing component can be avoided, and the service life and reliability of the sealing component can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 FIG. is a schematic structural diagram of a limit screw sealing structure for a valve actuator according to an embodiment of the present utility model.

[0018] DESCRIPTION OF THE REFERENCE NUMERALS:

[0019] 1, frame; 2, limit screw; 3, sealing ring; 4, annular groove; 5, limit ring; 6, assembly hole; 7, locking nut; 8, flat gasket ring; 9, recessed part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0021] In the description of the present utility model, 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 utility model 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 therefore should not be construed as a limitation to the present utility model. 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 utility model, unless otherwise specified, the meaning of "a plurality" is two or more.

[0022] 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.

[0023] The present utility model will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0024] A limit screw sealing structure for a valve actuator, as Figure 1 shown, includes a frame 1 and a limit screw 2 provided on the frame 1. One end of the frame 1 is provided with a threaded hole that cooperates with the limit screw 2, and the other end is provided with an assembly hole 6 for accommodating the limit screw 2. The assembly hole 6 communicates with the threaded hole, and the aperture of the assembly hole 6 is larger than that of the threaded hole. One end of the limit screw 2 sequentially passes through the assembly hole 6 and the threaded hole, and the other end is provided with a limit assembly. A sealing assembly for blocking the assembly hole 6 is provided at a position corresponding to the assembly hole 6 on the limit screw 2.

[0025] Exemplarily, the assembly hole 6 is a circular hole, and the assembly hole 6 is coaxially arranged with the threaded hole. By setting the aperture of the assembly hole 6 to be larger than that of the threaded hole, it can not only be used to accommodate the sealing assembly to ensure that the sealing assembly is not easily affected by the external environment, but also can limit the extending length of the limit screw 2. Under the limitation of the sealing assembly, the limit screw 2 can only move within the length range of the assembly hole 6, avoiding damage to the sealing structure or the valve actuator structure caused by over-adjustment, which is beneficial to ensuring the sealing effect of this sealing structure.

[0026] During actual use, the length of the assembly hole 6 can be adjusted according to actual needs to meet the movement of the sealing assembly within the assembly hole 6, so that the operator can adjust the length of the limit screw 2 extending into the threaded hole, which will not be elaborated here.

[0027] Optionally, the sealing assembly includes a sealing ring 3 provided on the limit screw 2. The sealing ring 3 is coaxially arranged with the limit screw 2, and an annular groove 4 cooperating with the sealing ring 3 is provided on the limit screw 2. Exemplarily, the sealing ring 3 can adopt an existing O-shaped rubber sealing ring.

[0028] In the actual application process, by providing an annular groove 4 on the limit screw 2 that cooperates with the sealing ring 3, the annular groove 4 can play a good limiting role on the sealing ring 3, ensuring that the sealing ring 3 can be continuously and stably installed on the limit screw 2 and play a sealing role on the assembly hole 6. At the same time, by using the annular groove 4 to limit the sealing ring 3, it can also prevent the sealing ring 3 from falling off during the screwing or movement of the limit screw 2, improving the stability and reliability of this sealing structure during use.

[0029] Optionally, a pair of limit rings 5 are provided at positions corresponding to the left and right ends of the sealing ring 3 on the limit screw 2. Each of the limit rings 5 is coaxially arranged with the limit screw 2. The inner side of the limit ring 5 is fixed on the limit screw 2, and the outer side has a clearance fit with the assembly hole 6. There is a limiting gap for cooperating with the sealing ring 3 between the two limit rings 5, and the limiting gap communicates with the annular groove 4.

[0030] Exemplarily, by fixing two limit rings 5 at the left and right ends of the sealing ring 3, the limit rings 5 can cooperate with the annular groove 4 to jointly realize the limiting of the sealing ring 3, further reducing the possibility of the sealing ring 3 falling off when the limit screw 2 is screwed or adjusted.

[0031] In addition, the limit ring 5 can also play a good role in controlling the deformation amount of the sealing ring 3, making the deformation pre-tightening force of the sealing ring 3 fixed, avoiding the sealing ring 3 being squeezed and broken due to excessive pre-tightening force in the original solution, or poor sealing effect due to too small pre-tightening force. It can not only ensure that the outer side of the sealing ring 3 continuously and stably fits with the inner wall of the assembly hole 6 to achieve sealing, but also prevent excessive deformation of the sealing ring 3 caused by the movement and adjustment of the limit screw 2, which is beneficial to improving the durability and reliability of the sealing ring 3.

[0032] Optionally, at least one set of sealing assemblies is provided along the length direction of the limit screw 2. Exemplarily, one set of sealing assemblies can be provided along the length direction of the limit screw 2, or two sets, three sets or multiple sets can be provided at intervals. By providing multiple sets of sealing assemblies, multi-stage sealing can be formed, which is beneficial to improving the sealing effect of the sealing assemblies on the assembly hole 6. Those skilled in the art can select and set an appropriate number of sealing assemblies according to actual needs. However, it should be noted that the length of the assembly hole 6 needs to be adjusted accordingly to meet the adjustment requirements of the screwing depth of the limit screw 2, which will not be elaborated here.

[0033] Optionally, the limiting component includes a lock nut 7 provided on the limiting screw 2, and the outer diameter of the lock nut 7 is larger than the aperture diameter of the assembly hole 6. Specifically, one end of the limiting screw 2 is fitted with the threaded hole of the frame 1, and the other end is fitted with the lock nut 7, so as to realize the stable assembly of the limiting screw 2 on the frame 1 and reduce the assembly difficulty of the limiting screw 2. At the same time, when the operator needs to adjust the screwing depth of the limiting screw 2, only need to use tools such as a wrench to limit the lock nut 7, and then screw the limiting screw 2, the operation is more convenient. After screwing, the lock nut 7 can limit the limiting screw 2 again, reducing the adjustment difficulty of the limiting screw 2 and improving the convenience of installation and use adjustment of this sealing structure.

[0034] Optionally, the limiting component further includes a flat washer 8 provided between the frame 1 and the lock nut 7 corresponding to the limiting screw 2. The outer diameter of the flat washer 8 is larger than the outer diameter of the lock nut 7. One end of the flat washer 8 abuts against the lock nut 7, and the other end abuts against the frame 1. Exemplarily, the flat washer 8 is coaxially arranged with the limiting screw 2. By providing the flat washer 8, it is beneficial to prevent the lock nut 7 from loosening. In addition, anti-slip patterns can be provided at both left and right ends of the flat washer 8 to further increase the friction between the flat washer 8 and the frame 1 and the lock nut 7, which is beneficial to further improve the stability of the lock nut 7 in limiting the limiting screw 2.

[0035] Optionally, a recess 9 facilitating the assembly of the limiting screw 2 is provided at the position of the frame 1 corresponding to the assembly hole 6. By providing the recess 9, it is convenient to guide the limiting screw 2 through the assembly hole 6, which is beneficial to further improve the convenience of assembling the limiting screw 2.

[0036] The limiting screw sealing structure for a valve actuator described in the present utility model has the advantages of simple structure, easy assembly, stable and reliable, good applicability, and high durability. It can be applied to the assembly of indoor and outdoor valve actuators, has good sealing performance, and is convenient for use and adjustment. By placing the sealing component in the assembly hole of the frame, the influence of external environments such as sunlight on the sealing component can be avoided, increasing the service life and reliability of the sealing component.

[0037] 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 replacements, 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. A limit screw sealing structure for a valve actuator, characterized in that: It includes a frame (1) and a limit screw (2) arranged on the frame (1). One end of the frame (1) is provided with a threaded hole for cooperating with the limit screw (2), and the other end is provided with an assembly hole (6) for accommodating the limit screw (2). The assembly hole (6) is communicated with the threaded hole, and the aperture of the assembly hole (6) is larger than that of the threaded hole. One end of the limit screw (2) sequentially passes through the assembly hole (6) and the threaded hole, and the other end is provided with a limit assembly. A sealing assembly for blocking the assembly hole (6) is arranged at the position of the limit screw (2) corresponding to the assembly hole (6).

2. The sealing structure of the limit screw for a valve actuator according to claim 1, characterized in that: The sealing assembly includes a sealing ring (3) arranged on the limit screw (2). The sealing ring (3) is coaxially arranged with the limit screw (2), and an annular groove (4) for cooperating with the sealing ring (3) is arranged on the limit screw (2).

3. A limit screw sealing structure for a valve actuator according to claim 2, characterized in that: A pair of limit rings (5) are arranged at the positions corresponding to the left and right ends of the sealing ring (3) on the limit screw (2). Each limit ring (5) is coaxially arranged with the limit screw (2). The inner side of the limit ring (5) is fixed on the limit screw (2), and the outer side is in clearance fit with the assembly hole (6). A limit gap for cooperating with the sealing ring (3) exists between the two limit rings (5), and the limit gap is communicated with the annular groove (4).

4. A limit screw sealing structure for a valve actuator according to any one of claims 1-3, characterized in that: At least one group of the sealing assemblies is arranged along the length direction of the limit screw (2).

5. The sealing structure of the limit screw for a valve actuator according to claim 1, characterized in that: The limit assembly includes a locking nut (7) arranged on the limit screw (2). The outer diameter of the locking nut (7) is larger than the aperture of the assembly hole (6).

6. A limit screw sealing structure for a valve actuator according to claim 5, characterized in that: The limit assembly further includes a flat washer ring (8) arranged on the limit screw (2) corresponding to the position between the frame (1) and the locking nut (7). The outer diameter of the flat washer ring (8) is larger than the outer diameter of the locking nut (7). One end of the flat washer ring (8) abuts against the locking nut (7), and the other end abuts against the frame (1).

7. A limit screw sealing structure for a valve actuator according to claim 1, characterized in that: A recessed part (9) facilitating the assembly of the limit screw (2) is arranged at the position of the frame (1) corresponding to the assembly hole (6).

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