Valve rod sealing structure

Abstract

The utility model relates to the field of ball valves, and particularly discloses a valve rod sealing structure. The valve rod sealing structure comprises a valve body, a movable valve rod mounted at the upper end of the valve body, a fixed valve rod mounted at the lower end of the valve body and a sealing piece mounted on the outer side of the movable valve rod, the sealing piece comprises a sealing cover and a gland, the lower end of the sealing cover is connected with the inner wall of the mounting hole, and a positioning hole allowing the movable valve rod to penetrate through is formed in the inner side of the sealing cover. The gland is installed on the upper side of the sealing cover, the lower end of the gland is connected with the inner wall of the positioning hole, a filling piece is connected between the lower side of the gland and the inner wall of the positioning hole and arranged on the outer wall of the movable valve rod in a sleeving mode, the lower end of the gland is inserted into the inner wall of the positioning hole and connected with the upper side of the filling piece, and a bottom cover connected with the lower end of the fixed valve rod is arranged at the lower end of the valve body. According to the sealing structure, leakage at the joint of the valve rod and the valve body can be effectively prevented, part looseness caused by vibration or other external force is avoided, and therefore the stability and the sealing effect of the sealing structure are ensured.

Description

Technical Field

[0001] This application relates to the field of ball valves, and more particularly to a valve stem sealing structure. Background Technology

[0002] Ball valves are widely used and high-performance valves. The stem sealing structure of a ball valve is one of the key components to ensure the overall sealing performance of the valve, and its main function is to prevent leakage between the stem and the valve body.

[0003] In the prior art, ball valves may be affected by vibration or other external forces during use, which may cause the valve stem and sealing structure to loosen. This may damage the sealing effect between the valve stem and the valve body. Traditional sealing structures may be complicated to install and disassemble, making it inconvenient to replace or repair the sealing structure, thus affecting the practicality of the valve stem sealing structure. Utility Model Content

[0004] To ensure the sealing performance at the connection between the valve stem and the valve body and to improve the practicality of the valve stem sealing structure, this application provides a valve stem sealing structure.

[0005] The valve stem sealing structure provided in this application adopts the following technical solution:

[0006] A valve stem sealing structure includes a valve body, a movable valve stem mounted on the upper end of the valve body, a fixed valve stem mounted on the lower end of the valve body, and a sealing element mounted on the outside of the movable valve stem. The valve body has an installation hole for inserting the movable valve stem and the fixed valve stem. The sealing element includes a sealing cap and a pressure cap. The lower end of the sealing cap is connected to the inner wall of the installation hole. The inner side of the sealing cap has a positioning hole for the movable valve stem to pass through. The pressure cap is mounted on the upper side of the sealing cap and its lower end is connected to the inner wall of the positioning hole. A filler is connected between the lower side of the pressure cap and the inner wall of the positioning hole. The filler is sleeved on the outer wall of the movable valve stem. The lower end of the pressure cap is inserted into the inner wall of the positioning hole and connected to the upper side of the filler. The lower end of the valve body is provided with a bottom cap connected to the lower end of the fixed valve stem.

[0007] By adopting the above technical solution, firstly, a complete sealing structure can be formed through the cooperation of components such as the sealing cover, gland, filler, and bottom cover, which can effectively prevent leakage between the valve stem and the valve body and ensure the sealing performance of the valve; secondly, the gland is connected to the sealing cover by a threaded second fastener. This connection method makes the installation and disassembly of the seal more convenient, facilitates the replacement or repair of the seal, and improves maintenance efficiency.

[0008] Optionally, the upper end of the sealing cover is threaded with a plurality of first fasteners that are threaded to the upper end of the valve body, and the outer wall of the sealing cover is fitted with a first sealing gasket that is connected to the valve body.

[0009] By adopting the above technical solution, the sealing cover can be more firmly installed on the valve body through multi-point fixing, avoiding loosening of the sealing cover due to vibration or other external forces, thereby ensuring the stability of the sealing structure; the setting of the first sealing gasket can further enhance the sealing effect between the sealing cover and the valve body, prevent fluid leakage from the connection between the sealing cover and the valve body, improve the sealing reliability of the entire valve, and extend the service life of the valve.

[0010] Optionally, a first bushing is installed between the lower end of the moving valve stem and the mounting hole, and the first bushing is located on the lower side of the sealing cover.

[0011] By adopting the above technical solution, the direct friction between the moving valve stem and the valve body can be reduced, the degree of wear can be decreased, thereby extending the service life of the moving valve stem and the valve body. At the same time, the first bushing can also play a certain positioning role, preventing impurities from damaging the sealing structure or affecting the normal operation of the valve, and ensuring the stability and reliability of the moving valve stem during operation.

[0012] Optionally, an exhaust component is fixedly installed at the upper end of the valve body, and a pressure relief groove communicating with the hole of the exhaust component is opened at the lower end of the sealing cover.

[0013] By adopting the above technical solution, the venting device and pressure relief groove allow the internal pressure of the valve body to be discharged through the venting device. When the internal pressure of the valve body is too high, it can be released in time to prevent the valve from being damaged due to excessive pressure, thus playing a safety protection role. At the same time, this pressure balancing mechanism is also conducive to the normal operation of the valve, avoiding problems such as difficulty in opening or incomplete closing of the valve caused by pressure difference.

[0014] Optionally, both ends of the gland are threaded with second fasteners, and the lower ends of the two second fasteners are threaded to the sealing cap.

[0015] By adopting the above technical solution, a tight fit between the gland and the sealing cap can be ensured, so that the filler is fixed between the gland and the sealing cap, ensuring the stability of the structure. This not only prevents leakage of liquid or gas, but also facilitates the replacement of the filler, improving the practicality of the structure.

[0016] Optionally, a ball is rotatably connected to the inner wall of the valve body. Both ends of the ball are provided with slots. One slot is used for inserting the moving valve stem, and the other slot is used for inserting the upper end of the stationary valve stem. The upper end of the stationary valve stem is equipped with a second bushing that is connected to the inner wall of the slot.

[0017] By adopting the above technical solution, the moving valve stem and the fixed valve stem can be accurately inserted into the ball and form a stable connection with the ball. The second bushing can reduce the direct friction between the fixed valve stem and the ball, reduce the degree of wear, enhance the connection stability between the fixed valve stem and the ball, and avoid loosening or misalignment between the fixed valve stem and the ball due to vibration or other external forces. This ensures the normal operation of the valve, prevents leakage and other malfunctions, and improves the sealing performance and reliability of the valve.

[0018] Optionally, the upper end of the bottom cover is fixedly connected to a positioning rod that is threadedly connected to the lower end of the valve stem, and the bottom cover is threadedly connected to a plurality of fastening bolts that are threadedly connected to the lower end of the valve body.

[0019] By adopting the above technical solution, the bottom cover and the fixed valve stem can be more firmly installed on the valve body, avoiding loosening of the bottom cover or the fixed valve stem due to external forces, thereby ensuring the overall structural stability of the valve. Multiple fastening bolts can ensure that the bottom cover is firmly installed at the lower end of the valve body, preventing valve leakage or other malfunctions due to loosening of the bottom cover, thereby improving the installation reliability of the valve and extending the service life of the valve.

[0020] Optionally, a second sealing gasket is connected between the upper side of the bottom cover and the lower side of the valve body.

[0021] By adopting the above technical solution, fluid leakage from the connection between the bottom cover and the valve body can be effectively prevented, the sealing performance of the valve can be improved, and impurities can be avoided from damaging the internal structure of the valve or affecting the normal operation of the valve.

[0022] In summary, this application has the following beneficial effects:

[0023] 1. This application effectively prevents leakage at the connection between the valve stem and the valve body by tightly fitting together components such as the sealing cap, filler, gland, and sealing gasket. The connection between each component is firm, which can prevent the components from loosening due to vibration or other external forces, thereby ensuring the stability of the sealing structure and thus guaranteeing the sealing effect.

[0024] 2. The installation and disassembly process of the seal in this application is relatively simple and quick, without the need for complicated tools or operating procedures, which facilitates the replacement or repair of the seal, improves maintenance efficiency and reduces maintenance costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the valve stem sealing structure according to an embodiment of this application;

[0026] Figure 2 This is a schematic diagram of the valve body and sealing element according to an embodiment of this application;

[0027] Figure 3This is a left view of the valve body and the moving valve stem according to an embodiment of this application;

[0028] Figure 4 yes Figure 3 Cross-sectional view along line AA;

[0029] Figure 5 This is a front view of the valve body and seal according to an embodiment of this application;

[0030] Figure 6 yes Figure 5 Schematic diagram of cross section along line BB.

[0031] Explanation of reference numerals in the attached drawings: 1. Valve body; 101. Mounting hole; 2. Moving valve stem; 3. Seal; 31. Sealing cover; 311. Positioning hole; 312. First fastener; 313. Pressure relief groove; 32. Pressure cap; 321. Second fastener; 33. First sealing gasket; 4. Filler; 5. Exhaust vent; 6. First bushing; 7. Bottom cover; 71. Positioning rod; 72. Fastening bolt; 73. Second sealing gasket; 8. Fixed valve stem; 9. Ball; 91. Slot; 10. Second bushing. Detailed Implementation

[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0033] This application discloses a valve stem sealing structure.

[0034] Reference Figure 1 The valve stem sealing structure includes a valve body 1 and a ball 9 rotatably mounted inside the valve body 1. Mounting holes 101 are provided at both the upper and lower ends of the valve body 1. A moving valve stem 2 is rotatably connected to the inner wall of the upper mounting hole 101, and a fixed valve stem 8 is provided on the inner wall of the lower mounting hole 101. The mounting holes 101 ensure the accurate installation of the moving valve stem 2 and the fixed valve stem 8. The upper and lower ends of the ball 9 are respectively provided with slots 91 for inserting one end of the moving valve stem 2 and the fixed valve stem 8. The lower end of the moving valve stem 2 is inserted into the slot 91 to drive the ball 9 to rotate inside the valve body 1. The upper end of the fixed valve stem 8 is inserted into the slot 91, and when the ball 9 rotates, the inner wall of the slot 91 rotates at the upper end of the fixed valve stem 8. A sealing element 3 is fixedly installed at the upper end of the valve body 1 to ensure the sealing between the moving valve stem 2 and the valve body 1. A bottom cover 7 is fixedly installed at the lower end of the valve body 1 to ensure the sealing of the connection between the valve stem 8 and the valve body 1, and the bottom cover 7 can also ensure the stability of the valve stem 8.

[0035] Reference Figure 1 , Figure 2 and Figure 3The sealing element 3 includes a sealing cap 31 and a pressure cap 32. The upper end of the sealing cap 31 is threaded with multiple first fasteners 312 that are threaded to the upper end of the valve body 1. In this application, the first fasteners 312 are bolts, used to ensure the stability of the connection between the sealing cap 31 and the valve body 1. The two ends of the pressure cap 32 are threaded with second fasteners 321 whose lower ends are threaded to the inner walls of the two ends of the sealing cap 31. In this application, the second fasteners 321 are screws, used to ensure a tight fit between the pressure cap 32 and the sealing cap 31. The lower end of the sealing cap 31 is connected to the inner wall of the mounting hole 101, and a positioning hole 311 is provided on the inner side of the sealing cap 31 for the valve stem 2 to pass through.

[0036] Reference Figure 2 , Figure 4 and Figure 6 The upper end of the bottom cover 7 is fixedly connected to a positioning rod 71, which is threaded to the lower end of the fixed valve stem 8. The outer wall of the positioning rod 71 has a threaded structure to ensure the stability of the connection between the fixed valve stem 8 and the bottom cover 7. A second sealing gasket 73 is connected between the upper side of the bottom cover 7 and the lower side of the valve body 1. The second sealing gasket 73 is used to prevent fluid leakage from the connection between the bottom cover 7 and the valve body 1, thereby improving the sealing performance of the valve. The bottom cover 7 is threadedly connected to multiple fastening bolts 72, which are threaded to the lower end of the valve body 1. The multiple fastening bolts 72 ensure that the bottom cover 7 is firmly installed at the lower end of the valve body 1, preventing valve leakage or other malfunctions due to loosening of the bottom cover 7, and improving the installation reliability of the valve.

[0037] Reference Figure 4 , Figure 5 and Figure 6 The outer wall of the sealing cover 31 is fitted with a first sealing gasket 33 that connects to the inner wall of the mounting hole 101 on the valve body 1. The first sealing gasket 33 is used to enhance the sealing effect between the sealing cover 31 and the valve body 1, preventing fluid leakage from the connection between the sealing cover 31 and the valve body 1. An exhaust component 5 is fixedly installed at the upper end of the valve body 1, and a pressure relief groove 313 communicating with the hole of the exhaust component 5 is opened at the lower end of the sealing cover 31. The exhaust component 5 and the pressure relief groove 313 enable the pressure inside the valve body 1 to be discharged through the exhaust component 5, preventing the valve from being damaged due to excessive pressure and playing a safety protection role.

[0038] Reference Figure 4 , Figure 6 A filler 4 is installed between the lower side of the pressure cap 32 and the inner wall of the positioning hole 311, and the filler 4 is sleeved on the outer wall of the moving valve stem 2. When the pressure cap 32 is connected to the sealing cap 31 via the second fastener 321, the filler 4 is fixed between the pressure cap 32 and the sealing cap 31 to prevent leakage between the moving valve stem 2 and the valve body 1 and the sealing cap 31.

[0039] Reference Figure 4 , Figure 6A ball 9 is rotatably connected to the inner wall of the valve body 1. Both ends of the ball 9 have slots 91. One slot 91 is for inserting the moving valve stem 2, and the other slot 91 is for inserting the upper end of the fixed valve stem 8, allowing the moving valve stem 2 and the fixed valve stem 8 to be accurately inserted into the ball 9 and form a stable connection. A first bushing 6 is installed between the lower end of the moving valve stem 2 and the mounting hole 101, and the first bushing 6 is located below the sealing cover 31. A second bushing 10 is installed at the upper end of the fixed valve stem 8, connecting to the inner wall of the slots 91. The first bushing 6 and the second bushing 10 reduce direct friction between the moving valve stem 2, the fixed valve stem 8, and the ball 9, reducing wear and extending the service life of the structure.

[0040] The implementation principle of the valve stem sealing structure in this embodiment is as follows: During assembly, firstly, the ball 9 is installed inside the valve body 1, and the slots at both ends of the ball 9 are aligned with the mounting holes 101. Then, the moving valve stem 2 is inserted into the mounting hole 101 at the upper end of the valve body 1 until the lower end of the moving valve stem 2 passes through the first bushing 6 and is inserted into the slot at the upper end of the ball 9. Secondly, the positioning hole 311 of the sealing cover 31 is fitted onto the outside of the moving valve stem 2, and the sealing cover 31 is pressed down until the first sealing gasket 33 on its outer side is tightly against the inner wall of the mounting hole 101. At this time, multiple first fasteners 312 are tightened to fix the sealing cover 31 onto the valve body 1, completing the installation of the sealing cover 31. Thirdly, the filler 4 is placed on the outside of the moving valve stem 2, and the filler 4 is pressed down until it enters the positioning hole 311 of the sealing cover 31. First, pass the pressure cap 32 through the moving valve stem 2 until the lower side of the pressure cap 32 is in contact with the filler 4. Then, tighten the two second fasteners 321 to connect with the sealing cap 31, completing the installation of the filler 4 and the pressure cap 32. In the fourth step, tighten the lower end of the fixed valve stem 8 on the outside of the positioning rod 71 until the lower side of the fixed valve stem 8 is close to the bottom cover 7. Then, put the second bushing 10 on the upper end of the fixed valve stem 8. Then, move the bottom cover 7 to insert the fixed valve stem 8 into the mounting hole 101 at the lower end of the valve body 1 until the fixed valve stem 8 and the second bushing 10 are simultaneously inserted into the slot at the lower end of the ball 9. Then, tighten multiple fastening bolts 72 through the bottom cover 7 to connect with the lower end of the valve body 1 until the second sealing gasket 73 on the bottom cover 7 is close to the lower side of the valve body 1, completing the installation of the fixed valve stem 8. Finally, the installation of the ball valve sealing structure is completed.

[0041] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A valve stem sealing structure, comprising a valve body (1), a movable valve stem (2) mounted on the upper end of the valve body (1), a fixed valve stem (8) mounted on the lower end of the valve body (1), and a sealing element (3) mounted on the outside of the movable valve stem (2), characterized in that: The valve body (1) has an installation hole (101) for inserting the moving valve stem (2) and the fixed valve stem (8). The sealing element (3) includes a sealing cover (31) and a pressure cover (32). The lower end of the sealing cover (31) is connected to the inner wall of the installation hole (101). The inner side of the sealing cover (31) has a positioning hole (311) for the moving valve stem (2) to pass through. The pressure cover (32) is installed on the upper side of the sealing cover (31) and its lower end is connected to the inner wall of the positioning hole (311). A filler (4) is connected between the lower side of the pressure cover (32) and the inner wall of the positioning hole (311). The filler (4) is sleeved on the outer wall of the moving valve stem (2). The lower end of the pressure cover (32) is inserted into the inner wall of the positioning hole (311) and connected to the upper side of the filler (4). The lower end of the valve body (1) is provided with a bottom cover (7) connected to the lower end of the fixed valve stem (8).

2. The valve stem seal structure of claim 1, wherein: The upper end of the sealing cover (31) is threaded with a plurality of first fasteners (312) that are threaded to the upper end of the valve body (1), and the outer wall of the sealing cover (31) is fitted with a first sealing gasket (33) that is connected to the valve body (1).

3. The valve stem seal assembly of claim 1, wherein: A first bushing (6) is installed between the lower end of the moving valve stem (2) and the mounting hole (101), and the first bushing (6) is located on the lower side of the sealing cover (31).

4. The valve stem seal assembly of claim 1, wherein: The upper end of the valve body (1) is fixedly installed with an exhaust component (5), and the lower end of the sealing cover (31) is provided with a pressure relief groove (313) that communicates with the hole of the exhaust component (5).

5. The valve stem seal assembly of claim 1, wherein: Both ends of the pressure cap (32) are threaded with second fasteners (321), and the lower ends of the two second fasteners (321) are threaded with the sealing cap (31).

6. The valve stem sealing structure according to claim 5, characterized in that: The inner wall of the valve body (1) is rotatably connected to a ball (9). Both ends of the ball (9) are provided with slots (91). One slot (91) is used for inserting the moving valve stem (2), and the other slot (91) is used for inserting the upper end of the fixed valve stem (8). The upper end of the fixed valve stem (8) is equipped with a second bushing (10) connected to the inner wall of the slot (91).

7. The valve stem seal assembly of claim 1 wherein: The upper end of the bottom cover (7) is fixedly connected to a positioning rod (71) that is threaded to the lower end of the fixed valve stem (8), and the bottom cover (7) is threadedly connected to a plurality of fastening bolts (72) that are threaded to the lower end of the valve body (1).

8. The valve stem seal assembly of claim 1 wherein: A second sealing gasket (73) is connected between the upper side of the bottom cover (7) and the lower side of the valve body (1).

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