Novel anti-rotation device for rotary lifting rod of stop valve

Abstract

The utility model relates to the technical field of stop valves, in particular to a novel stop valve rotary lifting rod anti-rotation device which comprises a valve body and a lifting screw installed at the upper end of the valve body, the upper end of the lifting screw is fixedly connected with a rotary handle, and a limiting mechanism is arranged on the outer side of the lifting screw. The limiting mechanism comprises two semi-ring bodies, the rear sides of the two semi-ring bodies are fixedly connected with connecting plates, the two connecting plates are elastically connected through a spring, the upper end of the valve body is fixedly connected with a U-shaped frame, the lifting screw penetrates through the horizontal part of the U-shaped frame, the horizontal part of the U-shaped frame is matched with the two semi-ring bodies, and the lifting screw is connected with the two semi-ring bodies. And rubber pads are arranged at the upper ends of the two semi-ring bodies. According to the anti-rotation valve, the anti-rotation effect can be achieved, the anti-rotation valve is arranged on the upper portion of the valve body, and when the anti-rotation valve is damaged and needs to be replaced subsequently, the anti-rotation valve is convenient to replace.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, and in particular to a novel anti-rotation device for the rotating lifting rod of a gate valve. Background Technology

[0002] A gate valve, also known as a stop valve, is a type of forced-seal valve. It primarily opens and closes by rotating a lifting rod, which in turn moves a valve disc up and down to control the flow of various fluids, including air, water, steam, corrosive media, slurry, oil, liquid metals, and radioactive media. Its applications are very wide. However, when the lifting rod moves the valve disc upwards, most existing systems prevent rotation of the lifting rod through the valve disc itself. The top of the valve disc, moving upwards with the lifting rod, directly contacts the inner wall of the gate valve to prevent rotation. This method easily causes wear on the top of the valve disc, affecting the normal operation of the gate valve.

[0003] The utility model patent with publication number CN217814994U discloses a device for preventing rotation of a stop valve rotary lifting rod, including a rotary lifting rod body, a valve body, and a handwheel and a valve disc disposed at the top and bottom of the rotary lifting rod body. A lower limit anti-rotation ring is fixedly sleeved on the outer surface of the rotary lifting rod body, and an upper limit anti-rotation ring is fixedly installed on the top of the inner wall of the valve body. This invention utilizes a lower limit anti-rotation ring, a rubber sealing ring, a limit screw sleeve, and an upper limit anti-rotation ring with a concave-convex fit to the lower limit anti-rotation ring and the rubber sealing ring to prevent the rotating lifting rod from rotating to a certain position. This device effectively prevents the rotating lifting rod of the gate valve from rotating, effectively limiting its position and ensuring the normal operation and use of the gate valve. It also provides good auxiliary support for related parts, improving the relative safety, stability, and sealing effect of the gate valve. However, in actual use, the aforementioned anti-rotation structure is located inside the valve body. When this anti-rotation structure is damaged and affects normal use, replacing it requires disassembling the entire valve body, which undoubtedly increases the overall workload. Therefore, how to solve this problem needs to be considered. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a novel anti-rotation device for the rotating lifting rod of a shut-off valve.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A novel anti-rotation device for a gate valve rotary lifting rod includes a valve body and a lifting screw installed on the upper end of the valve body. A rotating handle is fixedly connected to the upper end of the lifting screw. A limit mechanism is provided on the outer side of the lifting screw. The limit mechanism includes two semi-rings, and a connecting plate is fixedly connected to the rear side of each of the two semi-rings. The two connecting plates are elastically connected by a spring. A U-shaped frame is fixedly connected to the upper end of the valve body. The lifting screw passes through the horizontal part of the U-shaped frame, and the horizontal part of the U-shaped frame cooperates with the two semi-rings.

[0007] To better achieve the above objectives, the present invention adopts a further technical solution: rubber pads are provided at the upper ends of both semi-rings.

[0008] To better achieve the above objectives, the present invention adopts a further technical solution: a through hole is horizontally provided on the lifting screw, and metal rods are fixedly connected to the opposite sides of the two semi-rings, with the opposite ends of the two metal rods extending into the through hole.

[0009] To better achieve the above objectives, the present invention adopts a further technical solution: the outer walls of the two metal inserts are fitted to the inner wall of the through hole and are slidably connected.

[0010] The advantages of this utility model are: it can prevent rotation, and its placement on the upper part of the valve body makes it easy to replace when it is damaged and needs to be replaced. In addition, the use of a spring and a metal rod means that no tools are needed for installation and disassembly. Attached Figure Description

[0011] Figure 1 A schematic diagram of the structure of a novel anti-rotation device for a shut-off valve rotary lifting rod proposed in this utility model;

[0012] Figure 2 for Figure 1 Schematic diagram after removing the limiting mechanism;

[0013] Figure 3 This is an enlarged view of the limit mechanism.

[0014] In the diagram: 1 Valve body, 2 Lifting screw, 3 Rotating handle, 4 U-shaped frame, 5 Through hole, 6 Connecting plate, 7 Semi-ring, 8 Metal insert rod, 9 Spring, 10 Rubber pad. Detailed Implementation

[0015] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0016] Reference Figure 1-Figure 3A novel anti-rotation device for a gate valve rotary lifting rod includes a valve body 1 and a lifting screw 2 installed on the upper end of the valve body 1. A rotating handle 3 is fixedly connected to the upper end of the lifting screw 2 (this is prior art and will not be described in detail). A limit mechanism is provided on the outer side of the lifting screw 2, comprising two semi-rings 7. Rubber pads 10 are provided at the upper ends of both semi-rings 7. Connecting plates 6 are fixedly connected to the rear sides of both semi-rings 7. The two connecting plates 6 are elastically connected by springs 9. A U-shaped frame 4 is fixedly connected to the upper end of the valve body 1, and the lifting screw 2 passes through the U-shaped frame. In the horizontal part of 4, the horizontal part of the U-shaped frame 4 cooperates with the two semi-rings 7. Furthermore, when it is necessary to fully open the valve, the upward movement of the lifting screw 2 part just drives the two semi-rings 7 to move up to contact the horizontal part of the U-shaped frame 4, and the valve disc connected to the lifting screw 2 will not contact the inner top of the valve body 1. A through hole 5 is horizontally provided on the lifting screw 2. Metal rods 8 are fixedly connected to the opposite sides of the two semi-rings 7. The opposite ends of the two metal rods 8 extend into the inside of the through hole 5. The outer walls of the two metal rods 8 are in contact with the inner wall of the through hole 5 and are slidably connected.

[0017] In the use of this utility model, when it is necessary to open the valve disc, simply rotate the lifting screw 2 to move the valve disc upward. When the lifting screw 2 moves upward to the horizontal part of the two semi-rings 7 contacting the U-shaped frame 4, it is fully opened. At this time, the valve disc part does not contact the inner top of the valve body 1. Furthermore, the use of the rubber pad 10 can avoid hard contact, providing a certain degree of protection and improving the actual service life. In subsequent use, if the limiting mechanism is damaged and needs to be replaced, simply pull the two semi-rings 7 to move them in opposite directions, so that the metal rod 8 inside them leaves the corresponding through hole 5. Then pull the new two semi-rings 7 so that the metal rod 8 corresponds to the through hole 5. After releasing, under the elastic action of the spring 9, the snap-in connection can be completed without the aid of any tools.

Claims

1. A novel anti-rotation device for a rotating lifting rod of a gate valve, comprising a valve body (1) and a lifting screw (2) installed on the upper end of the valve body (1), wherein a rotating handle (3) is fixedly connected to the upper end of the lifting screw (2), characterized in that, The lifting screw (2) is provided with a limiting mechanism on its outer side. The limiting mechanism includes two semi-ring bodies (7). The rear sides of the two semi-ring bodies (7) are fixedly connected to a connecting plate (6). The two connecting plates (6) are elastically connected by a spring (9). The upper end of the valve body (1) is fixedly connected to a U-shaped frame (4). The lifting screw (2) passes through the horizontal part of the U-shaped frame (4). The horizontal part of the U-shaped frame (4) cooperates with the two semi-ring bodies (7).

2. The novel anti-rotation device for the rotating lifting rod of a shut-off valve according to claim 1, characterized in that, Rubber pads (10) are provided at the upper ends of both semi-rings (7).

3. A novel anti-rotation device for a gate valve rotating lifting rod according to claim 1, characterized in that, The lifting screw (2) has a through hole (5) horizontally through it. The two semi-rings (7) are fixedly connected to metal rods (8) on opposite sides, and the opposite ends of the two metal rods (8) extend into the through hole (5).

4. A novel anti-rotation device for a shut-off valve rotating lifting rod according to claim 3, characterized in that, The outer walls of both metal inserts (8) are fitted to the inner wall of the through hole (5) and are slidably connected.

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