Valve rod sealing structure

Abstract

The utility model discloses a valve rod sealing structure and relates to the technical field of valves. The valve comprises a valve body, a valve rod is connected to the valve body, a sealing assembly is connected to the valve body and comprises a cylinder and a first semicircular wedge block, the cylinder is fixedly connected to the upper surface of the valve body, a fixing ring is fixedly arranged on the inner surface of the cylinder, a wedge groove is formed in the fixing ring, and the first semicircular wedge block is arranged in the wedge groove. A first semicircular wedge-shaped block is assembled on the screw rod, the first semicircular wedge-shaped block is movably attached to the inner surface of the wedge-shaped groove, a through groove is formed in the inner surface of the wedge-shaped groove, and a second semicircular wedge-shaped block is assembled on the first semicircular wedge-shaped block. The semicircular sealing ring is attached to the outer side surface of the valve rod again, at the moment, the telescopic rod extends, and the leakage problem caused by abrasion and aging of the valve sealing structure between the valve rod and the valve body can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a valve stem sealing structure. Background Technology

[0002] The valve stem is an important component of the valve body, used for transmission. It connects to the actuator or handle at the top and directly drives the valve core to move or rotate, so as to realize the valve body's opening and closing or regulation function.

[0003] The existing sealing structure at the connection between the valve stem and the valve body is relatively simple. Most of them install a sealing ring on the valve stem as a sealing component to seal the connection. Since the valve stem rotates frequently when the valve is working, the sealing ring at the connection between the valve stem and the valve body will age and wear after long-term use, causing leakage at the valve connection. Utility Model Content

[0004] To address the issue of the relatively simple sealing structure at the connection between the valve stem and valve body in existing systems, which often involves installing a sealing ring on the valve stem as a sealing component to seal the joint, the valve stem rotates frequently during valve operation. Over time, the sealing ring at the connection between the valve stem and valve body will age and wear, causing leakage at the valve connection. The purpose of this invention is to provide a valve stem sealing structure.

[0005] To solve the above technical problems, the present invention adopts the following technical solution: a valve stem sealing structure, including a valve body, a valve stem connected to the valve body, and a sealing assembly connected to the valve body;

[0006] The sealing assembly includes a cylinder and a first semicircular wedge block. The cylinder is fixedly connected to the upper surface of the valve body. A fixing ring is fixedly provided on the inner surface of the cylinder. A wedge groove is formed inside the fixing ring. The first semicircular wedge block is movably fitted with the inner surface of the wedge groove. A through groove is formed on the inner surface of the wedge groove. A second semicircular wedge block is assembled on the first semicircular wedge block. A semicircular sealing ring is installed in both the first and second semicircular wedge blocks. The semicircular sealing ring is fitted with the outer surface of the valve stem. The second semicircular wedge... A protrusion is fixedly provided on the outer surface of the block, and the protrusion is movably fitted with the inner surface of the through groove. An assembly groove is provided on both the first semi-circular wedge block and the second semi-circular wedge block. An arc-shaped block is installed in the assembly groove. A second bolt is threaded into the arc-shaped block. The end of the second bolt is threaded into the first semi-circular wedge block and the second semi-circular wedge block. A telescopic rod is fixedly provided on the upper surface of the first semi-circular wedge block. A screw is rotatably provided on one of the protrusions. The screw thread passes through the telescopic rod. The telescopic rod is mounted on a cylinder.

[0007] Preferably, a positioning block is fixedly provided on the outer surface of the semicircular sealing ring, and positioning grooves are provided on the upper surfaces of the second semicircular wedge block and the first semicircular wedge block. The positioning block is movably fitted with the inner surface of the positioning groove, and an installation bolt is threaded into the positioning block. The end of the installation bolt is threaded into the inside of the positioning groove.

[0008] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0009] 1. This utility model can push the semi-circular wedge block downward by rotating the screw. Under the action of the wedge groove and the two semi-circular wedge blocks, the semi-circular sealing ring is put into contact with the outer surface of the valve stem again. At this time, the telescopic rod extends, which can reduce the leakage caused by wear and aging of the valve sealing structure between the valve stem and the valve body.

[0010] 2. In this invention, the positioning block on the outer surface of the semicircular sealing ring is placed into the positioning groove and connected by mounting bolts. After the semicircular sealing ring has been used for a period of time and has worn out significantly, a new semicircular sealing ring is installed. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the fixing ring structure of this utility model.

[0014] Figure 3 This is a schematic diagram of the second semicircular wedge block structure of this utility model.

[0015] In the diagram: 1. Valve body; 11. Valve stem; 2. Sealing assembly; 21. Cylinder; 22. Retaining ring; 23. Wedge groove; 24. Through groove; 25. First semi-circular wedge block; 26. Second semi-circular wedge block; 261. Protrusion; 27. Telescopic rod; 271. Notch; 272. Connecting bolt; 28. Screw; 29. ​​Semi-circular sealing ring; 3. Positioning block; 31. Mounting bolt; 32. Positioning groove; 33. Assembly groove; 34. Arc-shaped block; 35. Second bolt. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Example: Figure 1-3 As shown, this utility model provides a valve stem sealing structure, including a valve body 1, a valve stem 11 connected to the valve body 1, and a sealing assembly 2 connected to the valve body 1;

[0018] The sealing assembly 2 includes a cylinder 21 and a first semi-circular wedge block 25. The cylinder 21 is fixedly connected to the upper surface of the valve body 1. A fixing ring 22 is fixedly provided on the inner surface of the cylinder 21. A wedge groove 23 is formed inside the fixing ring 22. The first semi-circular wedge block 25 is movably fitted with the inner surface of the wedge groove 23. A through groove 24 is formed on the inner surface of the wedge groove 23. A second semi-circular wedge block 26 is assembled on the first semi-circular wedge block 25. A semi-circular sealing ring 29 is installed in both the first semi-circular wedge block 25 and the second semi-circular wedge block 26. The semi-circular sealing ring 29 is fitted with the outer surface of the valve stem 11. A protrusion 261 is fixedly provided on the outer surface of the second semi-circular wedge block 26. The protrusion 261 is movably fitted with the inner surface of the through groove 24. A telescopic rod 27 is fixedly provided on the upper surface of a semicircular wedge block 25. A screw 28 is rotatably provided on one of the protrusions 261. The screw 28 is threaded through the telescopic rod 27. The telescopic rod 27 is mounted on a cylinder 21. The first semicircular wedge block 25 and the second semicircular wedge block 26 are placed on the side of the valve stem 11 respectively. The arc block 34 is then placed into the assembly groove 33. The arc block 34, the first semicircular wedge block 25, and the second semicircular wedge block 26 are then assembled together by the second bolt 35. After that, the positioning block 3 on the outer surface of the semicircular sealing ring 29 can be placed into the positioning groove 32 and connected by the mounting bolt 31. After the semicircular sealing ring 29 has been used for a period of time and is worn out, a new semicircular sealing ring 29 can be replaced, making it convenient to replace the new sealing ring.

[0019] Both the first semicircular wedge block 25 and the second semicircular wedge block 26 are provided with assembly grooves 33. An arc-shaped block 34 is installed in the assembly groove 33. A second bolt 35 is threaded into the arc-shaped block 34. The end of the second bolt 35 is threaded into the first semicircular wedge block 25 and the second semicircular wedge block 26, so as to facilitate the assembly of the two first semicircular wedge blocks 25 and the second semicircular wedge block 26 together.

[0020] The cylinder 21 has a notch 271. The telescopic rod 27 is in contact with the inner surface of the notch 271. The cross-sectional shape of the telescopic rod 27 is "L". The telescopic rod 27 is composed of an L-shaped rod and a vertical square rod. The telescopic rod 27 is threaded with a connecting bolt 272. The end of the connecting bolt 272 is threaded into the inside of the notch 271 for easy equipment installation. The telescopic rod 27 is inserted into the notch 271 and connected by the connecting bolt 272. When the semi-circular sealing ring 29 is no longer in contact with the outer surface of the valve stem 11, the screw 28 can be rotated to push the semi-circular wedge block downward. Under the action of the wedge groove 23 and the two semi-circular wedge blocks, the semi-circular sealing ring 29 is in contact with the outer surface of the valve stem 11 again. At this time, the telescopic rod 27 extends, which can reduce the leakage caused by the wear and aging of the valve sealing structure between the valve stem 11 and the valve body 1.

[0021] A positioning block 3 is fixedly provided on the outer surface of the semicircular sealing ring 29. The upper surfaces of the second semicircular wedge block 26 and the first semicircular wedge block 25 are provided with positioning grooves 32. The positioning block 3 is movably fitted with the inner surface of the positioning groove 32. A mounting bolt 31 is threaded into the positioning block 3. The end of the mounting bolt 31 is threaded into the inside of the positioning groove 32. Two through grooves 24 are provided in the through groove 24. The two through grooves 24 are symmetrically arranged on the inner surface of the fixing ring 22, which can improve the sealing performance after assembly.

[0022] Working principle: When using this utility model, the first semi-circular wedge block 25 and the second semi-circular wedge block 26 are placed on the side of the valve stem 11, and the arc block 34 is placed into the assembly groove 33. Then, the arc block 34, the first semi-circular wedge block 25 and the second semi-circular wedge block 26 are assembled together by the second bolt 35. Then, the positioning block 3 on the outer surface of the semi-circular sealing ring 29 can be placed into the positioning groove 32 and connected by the mounting bolt 31. After the semi-circular sealing ring 29 is worn out after a period of use, a new semi-circular sealing ring 29 is replaced.

[0023] Then, the telescopic rod 27 can be inserted into the notch 271 and connected by the connecting bolt 272. When the semi-circular sealing ring 29 is no longer in contact with the outer surface of the valve stem 11, the screw 28 can be rotated to push the semi-circular wedge block downward. Through the action of the wedge groove 23 and the two semi-circular wedge blocks, the semi-circular sealing ring 29 is in contact with the outer surface of the valve stem 11 again. At this time, the telescopic rod 27 extends, which can reduce the leakage caused by the wear and aging of the valve sealing structure between the valve stem 11 and the valve body 1.

[0024] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A valve stem sealing structure, comprising a valve body (1), characterized in that, A valve stem (11) is connected to the valve body (1), and a sealing assembly (2) is connected to the valve body (1); The sealing assembly (2) includes a cylinder (21) and a first semicircular wedge block (25). The cylinder (21) is fixedly connected to the upper surface of the valve body (1). A fixing ring (22) is fixedly provided on the inner surface of the cylinder (21). A wedge groove (23) is provided inside the fixing ring (22). The first semicircular wedge block (25) is movably fitted with the inner surface of the wedge groove (23). A through groove (24) is provided on the inner surface of the wedge groove (23). A second semicircular wedge block (26) is assembled on the first semicircular wedge block (25). The first semicircular wedge block (25) and the second semicircular wedge block (26) are connected. Each wedge block (26) is equipped with a semi-circular sealing ring (29), which is in contact with the outer surface of the valve stem (11). The outer surface of the second semi-circular wedge block (26) is fixedly provided with a protrusion (261), which is in contact with the inner surface of the through groove (24). The upper surface of the first semi-circular wedge block (25) is fixedly provided with a telescopic rod (27), and a screw (28) is rotatably provided on one of the protrusions (261). The screw (28) is threaded through the telescopic rod (27), which is mounted on the cylinder (21).

2. A valve stem seal assembly as in claim 1, wherein, A positioning block (3) is fixedly provided on the outer surface of the semicircular sealing ring (29). The upper surfaces of the second semicircular wedge block (26) and the first semicircular wedge block (25) are provided with positioning grooves (32). The positioning block (3) is movably fitted with the inner surface of the positioning groove (32). A mounting bolt (31) is threadedly inserted on the positioning block (3). The end of the mounting bolt (31) is threadedly inserted into the inside of the positioning groove (32).

3. A valve stem seal assembly as in claim 1, wherein: Both the first semicircular wedge block (25) and the second semicircular wedge block (26) are provided with assembly grooves (33). An arc block (34) is installed in the assembly groove (33). A second bolt (35) is threaded into the arc block (34). The end of the second bolt (35) is threaded into the first semicircular wedge block (25) and the second semicircular wedge block (26).

4. A valve stem seal assembly as in claim 1, wherein: The cylinder (21) has a notch (271) and the telescopic rod (27) is in contact with the inner surface of the notch (271). A connecting bolt (272) is threaded into the telescopic rod (27) and the end of the connecting bolt (272) is threaded into the inside of the notch (271).

5. A valve stem seal assembly as in claim 1, wherein, The cross-sectional shape of the telescopic rod (27) is "L".

6. A valve stem seal assembly as in claim 1, wherein, The through groove (24) has two through grooves (24), which are symmetrically arranged on the inner surface of the fixing ring (22).

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