Valve actuator structure

Abstract

The utility model provides a valve actuator structure belongs to valve technical field, including hydraulic cylinder body, the left and right end of hydraulic cylinder body is fixed with end cover, the hydraulic oil cavity of hydraulic cylinder body is equipped with rack, rack is engaged with the gear on gear shaft, is equipped with adjusting screw rod in the central part of end cover, is equipped with locking nut and locking nut on the one end of adjusting screw rod, locking nut is located between locking nut and end cover, is equipped with O type sealing ring on the both sides of locking nut, the characteristic is: the central position of the side of end cover towards hydraulic oil cavity constitutes end cover sealing cavity, end cover sealing cavity corresponds with adjusting screw rod and the one end of adjusting screw rod towards hydraulic oil cavity stretches to hydraulic oil cavity via end cover sealing cavity, is equipped with additional sealing ring on adjusting screw rod and the position of end cover sealing cavity. Advantages: avoid the leakage of hydraulic oil from the gap between adjusting screw rod and end cover to the outside in the link of disassembling locking nut and locking nut, embody the ideal sealing effect to adjusting screw rod.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically relating to a valve actuator structure. Background Technology

[0002] As the literal definition of a valve actuator suggests, it plays a crucial role in driving valve movement and ensuring precise control. It is a key device for opening and closing valves, and its reliability directly affects the valve's sealing (tightness) and operational reliability and stability. The regulating and limiting device within the valve actuator's structural system is extremely important, as it relates to the valve's sealing performance when closed in the pipeline—in other words, its ability to effectively cut off the fluid flow in the pipeline.

[0003] Figure 1 The diagram shown is a schematic of a valve actuator structure in the prior art. In valve actuator design, the traditional regulating and limiting structure is as follows: Figure 1 As shown: The adjusting screw 4 is installed on the end cover 3 by means of a threaded connection. The adjusting screw 4 adjusts the left and right movement distance of the rack 8. More specifically, by adjusting the movement distance of the rack 8, the angle position of the square opening 9 of the gear shaft 6 when meshing with the rack 8 (the square opening 9 and the valve stem cooperate) can be changed, thereby achieving the purpose of adjusting the opening and closing angle of the valve. Figure 1 The adjusting screw 4 shown on the left is used to adjust the valve closing angle, while the adjusting screw 4 shown on the right is used to adjust the valve opening angle. The rack 8 and the gear shaft 6 are installed inside the hydraulic cylinder body 7. The rack 8 is driven to move left and right by the hydraulic oil on both sides of the hydraulic cylinder body 7, which drives the gear shaft 6 to rotate 90° clockwise or 90° counterclockwise, thereby realizing the valve closing or opening.

[0004] Locking nut 1 and locking nut 2 are used to lock the adjusting screw 4. The end faces of locking nut 1 and locking nut 2 are equipped with O-ring seals 5 to prevent hydraulic oil from leaking out.

[0005] The above is from Figure 1 The valve actuator structure shown has the following defects in practical applications: When adjusting the valve closing and opening angles, the left and right movement position of the adjusting rack 8 needs to be adjusted. To adjust the left and right movement position of the rack 8, the locking nut 1 and locking nut 2 must be removed first. Since the cylinder is filled with pressurized hydraulic oil, the hydraulic oil will leak outward along the thread gap between the adjusting screw 4 and the end cover 3, i.e., there is leakage. In an impact and vibration environment, if either the locking nut 1 or the locking nut 2 becomes loose, the hydraulic oil will leak outward along the thread gap between the adjusting screw 4 and the end cover 3.

[0006] Based on the existing technical situation, it is necessary to make reasonable improvements. The technical solution to be introduced below is generated in this context. Utility Model Content

[0007] The objective of this invention is to provide a valve actuator structure that helps prevent hydraulic oil from leaking to the outside through the thread gap between the adjusting screw and the end cap during the disassembly of the locking nut and locking cap, thereby achieving an ideal sealing effect on the adjusting screw.

[0008] The present invention achieves its objective as follows: a valve actuator structure includes a hydraulic cylinder body, with an end cap fixed at each of the left and right ends of the hydraulic cylinder body. A rack is disposed within the hydraulic oil chamber of the hydraulic cylinder body, shifting left and right. The rack teeth face upwards and mesh with a gear on a gear shaft located above the rack. An adjusting screw is disposed at the center of the end cap for adjusting the rack to change the angle of the square opening of the gear shaft. A locking nut and a locking screw are disposed at the end of the adjusting screw that extends to the end cap for locking. The nut is located between the locking nut and the end cap. On each side of the locking nut, an O-ring is provided to prevent hydraulic oil in the hydraulic oil chamber from leaking to the outside via the adjusting screw. The feature is that an end cap sealing cavity is formed at the center of the side of the end cap facing the hydraulic oil chamber. This end cap sealing cavity corresponds to the adjusting screw, and the end of the adjusting screw facing the hydraulic oil chamber extends through the end cap sealing cavity into the hydraulic oil chamber. An additional sealing ring is provided on the adjusting screw at the position of the end cap sealing cavity.

[0009] In one specific embodiment of this utility model, the additional sealing ring is an O-ring.

[0010] The technical solution provided by this utility model has an end cap sealing cavity at the center of the side of the end cap facing the hydraulic oil cavity, and this end cap sealing cavity corresponds to the adjusting screw. The end of the adjusting screw facing the hydraulic oil cavity extends into the hydraulic oil cavity through the end cap sealing cavity. Furthermore, since an additional sealing ring is added to the adjusting screw at the position of the end cap sealing cavity, it helps to prevent the hydraulic oil in the hydraulic oil cavity from leaking to the outside through the thread gap of the end cap along the adjusting screw during the process of disassembling the locking nut and locking bolt. The additional sealing ring provides an ideal sealing effect for the adjusting screw. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a valve actuator structure in the prior art;

[0012] Figure 2 This is a schematic diagram of the valve actuator structure of this utility model;

[0013] Figure 3 for Figure 2 The diagram shows a detailed structure of the end cap, adjusting screw, and additional sealing ring mounted thereon.

[0014] In the diagram: 1. Locking nut; 2. Locking nut; 3. End cap; 31. End cap sealing cavity; 4. Adjusting screw; 41. Additional sealing ring; 5. O-ring; 6. Gear shaft; 7. Hydraulic cylinder body; 71. Hydraulic oil cavity; 8. Rack; 9. Square opening. Detailed Implementation

[0015] In order to better understand the technical essence and beneficial effects of this utility model, the applicant provides a detailed description below by way of embodiments. However, the description of the embodiments is not intended to limit the solution of this utility model. Any formal but not substantive equivalent transformations made based on the concept of this utility model should be considered within the scope of the technical solution of this utility model.

[0016] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back are based on, unless otherwise stated, the following. Figure 2 The location and state of the object are taken as examples, and therefore should not be construed as a special limitation on the technical solution provided by this utility model.

[0017] Please see Figure 2 and Figure 3 The diagram shows a hydraulic cylinder body 7, with an end cap 3 fixed to both the left and right ends. A rack 8 is disposed within the hydraulic oil chamber 71 of the hydraulic cylinder body 7, shifting left and right. The rack teeth of the rack 8 face upward and mesh with a gear on the gear shaft located above it. An adjusting screw 4 is disposed at the center of the end cap 3 to adjust the rack 8 and change the angle of the square opening 9 of the gear shaft 6. A locking nut 1 and a locking nut 2 are disposed at one end of the adjusting screw 4 that extends to the end cap 3. The locking nut 2 is located between the locking nut 1 and the end cap 3. On each side of the locking nut 2, an O-ring seal 5 is disposed to prevent the hydraulic oil in the hydraulic oil chamber 71 from leaking to the outside through the adjusting screw 4.

[0018] The key technical points of the technical solution provided by this utility model are as follows: an end cap sealing cavity 31 is formed at the center of the side of the aforementioned end cap 3 facing the aforementioned hydraulic oil cavity 71. The end cap sealing cavity 31 corresponds to the aforementioned adjusting screw 4, and the end of the adjusting screw 4 facing the hydraulic oil cavity 71 extends through the end cap sealing cavity 31 to the hydraulic oil cavity 71. An additional sealing ring 41 is provided on the adjusting screw 4 at the position of the end cap sealing cavity 31.

[0019] In this embodiment, the aforementioned additional sealing ring 41 is an O-ring.

[0020] As can be seen from the technical solution provided by this utility model, an additional sealing ring 41, which is an O-ring, is added to the end of the adjusting screw 4 facing the hydraulic oil chamber 71. Therefore, if either the locking nut 1 or the locking nut 2 becomes loose, hydraulic oil will not leak out through the thread gap between the adjusting screw 4 and the end cover 3. In addition, the additional sealing ring 41 between the end of the adjusting screw 4 and the sealing hole of the end cover 3 can effectively increase the loosening effect when the threaded connection between the end of the adjusting screw 4 and the end cover 3 is made.

[0021] Preferably, in this embodiment, the locking nut 1 is made of H62 brass and undergoes surface passivation treatment; the locking nut 2 is made of H62 brass and undergoes surface passivation treatment; the end cap 3 is made of 45# steel and undergoes heat treatment; the adjusting screw 4 is made of 45# steel and undergoes heat treatment; and the O-ring seal 5 and the additional seal 41 are made of nitrile rubber.

[0022] When adjusting the valve's closed or open position using the structure of this utility model, the additional sealing ring 41, along with the end cover 3 and adjusting screw 4, can effectively solve oil leakage and increase anti-loosening measures.

[0023] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the invention task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A valve actuator structure, comprising a hydraulic cylinder body (7), with an end cap (3) fixed at each of the left and right ends of the hydraulic cylinder body (7), a rack (8) disposed in the hydraulic oil chamber (71) of the hydraulic cylinder body (7) with its teeth facing upward and meshing with a gear on a gear shaft located above it, and an adjusting screw (4) disposed at the center of the end cap (3) for adjusting the rack (8) to change the angle of the square opening (9) of the gear shaft (6), and a locking nut (1) and a locking nut (2) disposed at one end of the adjusting screw (4) extending to the end cap (3), the locking nut (2) being located between the locking nut (1) and the end cap (3), wherein, On each side of the locking nut (2), an O-ring (5) is provided to prevent the hydraulic oil in the hydraulic oil chamber (71) from leaking to the outside through the adjusting screw (4). The feature is that an end cap sealing cavity (31) is formed at the center of the side of the end cap (3) facing the hydraulic oil chamber (71). The end cap sealing cavity (31) corresponds to the adjusting screw (4), and the end of the adjusting screw (4) facing the hydraulic oil chamber (71) extends to the hydraulic oil chamber (71) through the end cap sealing cavity (31). An additional sealing ring (41) is provided on the adjusting screw (4) at the position of the end cap sealing cavity (31).

2. The valve actuator structure according to claim 1, characterized in that: The additional sealing ring (41) is an O-ring.

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