Valve rod sealing structure for high-frequency switch

Abstract

The utility model relates to the technical field of valves, in particular to a valve rod sealing structure for a high-frequency switch, which comprises a valve rod rotationally connected to a valve body, and the valve rod is provided with a flexible sealing assembly, a flexible protection assembly for protecting the flexible sealing assembly and a pressing structure for pressing the flexible sealing assembly and the flexible protection assembly. The flexible protection assembly is in abutting fit with the valve body, friction between the flexible sealing assembly and the valve body and friction between the flexible sealing assembly and the valve rod are reduced through the arrangement of the flexible sealing assembly and the flexible protection assembly, and meanwhile sealing between the valve rod and the valve body is achieved preliminarily; according to the floating ball valve, the flexible sealing assembly and the flexible protection assembly deform and extrude each other due to the pressure applied by the pressing and holding structure, the valve rod and the valve body are extruded towards the two sides at the same time to be tightly attached, a local gap between the valve rod and the valve body is filled, and therefore self-sealing is achieved, the sealing effect is further ensured, and the service life of the floating ball valve is prolonged.

Description

Technical Field

[0001] This application relates to the field of valve technology, and in particular to a valve stem sealing structure for high-frequency switching. Background Technology

[0002] Currently, ball valves typically require sealing. Ball valves possess excellent sealing performance and can effectively reduce media leakage, thereby reducing energy consumption and material loss during the production process, improving production efficiency. Furthermore, media leakage poses risks of equipment corrosion and threats to personnel health. Therefore, the sealing performance of ball valves is crucial for the safe and stable use of floating ball valves.

[0003] A ball valve includes a valve body, a ball, a valve stem, and a valve. The ball is fixedly connected to the valve stem, and the valve body is rotatably connected to the valve stem. Both the ball and the valve stem are located inside the valve body, and the valve is located on the ball. Thus, the valve stem can drive the ball to rotate within the valve body to control the flow of fluid.

[0004] Rectangular ring flexible graphite packing or V-type PTFE packing is usually used as the valve stem sealing packing between the valve body and the valve stem. These two types of valve stem sealing packing are suitable for valves that are not frequently opened and closed. However, for valves that need to be opened and closed frequently, the valve stem will wear down after high-frequency opening and closing operations, resulting in medium leakage at the valve stem. This is an area that needs improvement. Utility Model Content

[0005] To reduce wear on the sealing packing, this application provides a valve stem sealing structure for high-frequency switching.

[0006] This application provides a valve stem sealing structure for high-frequency switches, which adopts the following technical solution:

[0007] A valve stem sealing structure for high-frequency switching includes a valve stem rotatably connected to a valve body. The valve stem is provided with a flexible sealing component, a flexible protective component for protecting the flexible sealing component, and a pressing structure for pressing the flexible sealing component and the flexible protective component together. The flexible protective component forms an abutting fit with the valve body.

[0008] By adopting the above technical solution, the wear of the flexible sealing component and the flexible protection component are reduced, as are the friction between the flexible sealing component and the valve body and valve stem. At the same time, a preliminary seal between the valve stem and the valve body is achieved. With the help of the pressure-holding structure, the flexible sealing component and the flexible protection component deform and squeeze each other due to the pressure applied by the pressure-holding structure. At the same time, they squeeze the valve stem and valve body to both sides and form a tight fit, filling the local gap between the valve stem and the valve body, thereby achieving self-sealing, further ensuring the sealing effect and extending the service life of the floating ball valve.

[0009] Preferably, the flexible protection component includes a shaped ring, which is sleeved on the valve stem. The shaped ring has a cone angle, and the cone surface of the cone angle forms an abutting fit with the valve body.

[0010] By adopting the above technical solution, utilizing the irregular ring and its cone angle, and with the cone surface of the cone angle forming an abutting fit with the valve body, it helps to strengthen the seal between the valve stem and the valve body.

[0011] Preferably, the flexible sealing assembly includes two wedge rings, with the wedge surfaces of the two wedge rings forming an abutting fit. The irregular ring is provided with an adapter groove that adapts to the two wedge rings, and either wedge ring is fitted into the adapter groove.

[0012] By adopting the above technical solution, the two wedge rings are compressed and squeezed against each other under the action of the pressure holding structure. At the same time, the two wedge rings squeeze the valve body respectively, and the two wedge rings and the irregular ring squeeze and seal against each other. At this time, dynamic seals are formed between the two wedge rings, between any wedge ring and the valve body, and between the irregular ring and the valve stem, thereby improving the sealing performance between the valve body and the valve stem.

[0013] Preferably, the flexible sealing assembly includes a U-shaped sealing ring, the flexible protection assembly includes a U-shaped protection ring, the U-shaped protection ring is provided with a U-shaped groove, the U-shaped sealing ring and the U-shaped groove form an embedded fit, the U-shaped protection ring is sleeved on the valve stem, and the outer wall of the U-shaped protection ring forms an abutting fit with the valve body.

[0014] By adopting the above technical solution, the valve stem will move upward in a small range under the action of the medium pressure in the valve body. At this time, the valve stem will squeeze the U-shaped sealing ring and the U-shaped protective ring. The U-shaped protective ring will deform due to the compression and form a tight contact with the valve body and the valve stem. While achieving a seal between the valve body and the valve stem, the U-shaped sealing ring and the U-shaped protective ring will also squeeze and stick to each other to form a dynamic seal, thereby improving the sealing performance between the valve body and the valve stem.

[0015] Preferably, the flexible protection component includes a dustproof ring for preventing external dust from entering the gap between the valve body and the valve stem. The dustproof ring is sleeved on the valve stem, and a sealed space is formed between the dustproof ring, the valve stem, and the shaped ring to prevent the wedge ring from being squeezed out.

[0016] By adopting the above technical solution and utilizing the dustproof ring, the dustproof ring can prevent external dust from entering the gap between the valve body and the valve stem, reducing the possibility of friction damage to the valve stem caused by dust accumulation. At the same time, the dustproof ring protects the two wedge-shaped rings from being squeezed out of the fitting groove when subjected to deformation and compression by the irregular-shaped ring, thus improving the sealing stability.

[0017] Preferably, the pressure holding structure includes a pressure sleeve, which is sleeved on the valve stem and forms an abutment fit with the dustproof ring.

[0018] By adopting the above technical solution, the pressure of the sleeve allows the flexible sealing component and the flexible protection component to fit more tightly onto the valve stem and valve body under pressure, thereby improving the sealing effect.

[0019] Preferably, the pressing structure includes a packing ring for pressing the pressing sleeve, the packing ring being threadedly connected to the top of the valve stem.

[0020] By adopting the above technical solution, the packing ring is threaded onto the valve stem, and the packing ring is screwed down to press down the pressure sleeve, flexible sealing component, and flexible protection component, thereby improving the sealing stability between the valve body and the valve stem.

[0021] Preferably, a disc spring is provided between the pressure sleeve and the packing ring. The disc spring is sleeved on the valve stem, and the upper end of the disc spring forms an abutting fit with the packing ring, while the lower end of the disc spring forms an abutting fit with the pressure sleeve.

[0022] By adopting the above technical solution and utilizing the disc spring, the disc spring will rebound and press the pressure sleeve and the pressure sleeve after being subjected to the pressure of the packing ring. The elastic effect of the disc spring can make the pressure sleeve and the packing ring maintain continuous pressure on the flexible sealing component, thereby ensuring the long-lasting sealing force of the flexible sealing component.

[0023] In summary, this application includes at least one of the following beneficial technical effects:

[0024] 1. By utilizing the flexible sealing component and the flexible protection component, the wear of the flexible sealing component is reduced, as is the friction between the flexible sealing component and the valve body and valve stem. At the same time, a preliminary seal is achieved between the valve stem and the valve body. With the use of the pressure-holding structure, the flexible sealing component and the flexible protection component deform and squeeze each other due to the pressure applied by the pressure-holding structure. At the same time, they squeeze the valve stem and valve body to both sides and form a tight fit, filling the local gap between the valve stem and the valve body, thereby achieving self-sealing, further ensuring the sealing effect, and extending the service life of the floating ball valve.

[0025] 2. By using two wedge rings, the two wedge rings are compressed and squeezed against each other under the action of the pressure holding structure. At the same time, the two wedge rings squeeze the valve body respectively, and the two wedge rings and the irregular ring squeeze each other tightly to seal. At this time, dynamic seals are formed between the two wedge rings, between any wedge ring and the valve body, and between the irregular ring and the valve stem, thereby improving the sealing performance between the valve body and the valve stem.

[0026] 3. Under the pressure of the medium inside the valve body, the valve stem will move upward in a small range. At this time, the valve stem will squeeze the U-shaped sealing ring and the U-shaped protective ring. Due to the deformation caused by the compression, the U-shaped protective ring will form a tight contact with the valve body and the valve stem. While achieving a seal between the valve body and the valve stem, the U-shaped sealing ring and the U-shaped protective ring will also squeeze and stick to each other to form a dynamic seal, thereby improving the sealing performance between the valve body and the valve stem. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view that mainly reflects the overall internal structure in the embodiments of this application;

[0028] Figure 2 yes Figure 1 The image shows a magnified section that primarily illustrates the connection between the irregular ring and the wedge ring.

[0029] Reference numerals: 1. Valve stem; 2. Sealing assembly; 21. U-shaped sealing ring; 22. Wedge ring; 3. Protective assembly; 31. U-shaped protective ring; 311. U-shaped groove; 32. Irregular ring; 321. Adaptor groove; 322. Cone angle; 33. Dustproof ring; 4. Pressing structure; 41. Pressure sleeve; 42. Packing pressure ring; 43. Disc spring. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 2 This application will be described in further detail.

[0031] This application discloses a valve stem sealing structure for high-frequency switches.

[0032] Reference Figure 1 A valve stem sealing structure for high-frequency switching includes a valve stem 1 rotatably connected inside a valve body, a flexible sealing component 2, a flexible protective component 3 for protecting the flexible sealing component 2, and a pressing structure 4 for pressing the flexible sealing component 2 and the flexible protective component 3 together. The flexible sealing component 2 seals the gap between the valve body and the valve stem 1. The valve body and the valve stem 1 respectively form an abutment fit with the flexible protective component 3. The pressing structure 4 is disposed on the valve stem 1. By utilizing the flexible protective component 3, the direct contact area between the flexible sealing component 2 and the valve body and the valve stem 1 is reduced, thereby reducing the friction between the flexible sealing component 2 and the valve body and the valve stem 1.

[0033] Reference Figure 1When the operator rotates the valve stem 1, since the valve stem 1 is fixedly mounted on the ball, the valve stem 1 can drive the ball to rotate within the valve body to control the flow of fluid. Simultaneously, the flexible sealing component 2 and the flexible protection component 3 reduce wear on the flexible sealing component 2, as well as friction between the flexible sealing component 2 and the valve body and valve stem 1, thus initially achieving a seal between the valve stem 1 and the valve body. Utilizing the pressure-holding structure 4, the flexible sealing component 2 and the flexible protection component 3 deform and squeeze against each other due to the pressure applied by the pressure-holding structure 4, simultaneously squeezing the valve stem 1 and valve body to both sides to form a tight fit, filling the local gap between the valve stem 1 and the valve body, thereby achieving self-sealing, further ensuring the sealing effect, and extending the service life of the ball valve.

[0034] Reference Figure 1 The flexible sealing component 2 includes a U-shaped sealing ring 21, and the flexible protection component 3 includes a U-shaped protection ring 31. The U-shaped protection ring 31 and the U-shaped sealing ring 21 are disposed in the gap between the valve stem 1 and the valve body. The U-shaped protection ring 31 is provided with an upward-facing U-shaped groove 311. The U-shaped sealing ring 21 and the U-shaped groove 311 form an embedded fit, so that the U-shaped protection ring 31 can isolate and protect the U-shaped sealing ring 21. The U-shaped protection ring 31 is sleeved on the valve stem 1, and the outer wall of the U-shaped protection ring 31 forms an abutting fit with the valve body.

[0035] Reference Figure 1 In this embodiment, the U-shaped sealing ring 21 is preferably made of flexible graphite. Flexible graphite has strong plasticity and good sealing performance, which helps to improve the sealing performance between the U-shaped sealing ring 21 and the U-shaped protective ring 31. The U-shaped protective ring 31 is preferably made of fluoroplastic. Fluoroplastics have good sealing performance and low coefficient of friction, which helps to reduce the friction between the U-shaped protective ring 31 and the valve stem 1, thereby facilitating the rotation of the valve stem 1.

[0036] Reference Figure 1 Under the pressure of the medium inside the valve body, the valve stem 1 of the U-shaped sealing ring will move upward in a small range. At this time, the valve stem 1 will squeeze the U-shaped sealing ring and U-shaped ring upward. Due to the compression deformation, the U-shaped sealing ring will form a tight contact with the valve body and the valve stem 1. While achieving the sealing between the valve body and the valve stem 1, the U-shaped sealing ring 21 and the U-shaped protective ring 31 will also squeeze and stick to each other to form a dynamic seal, thereby improving the sealing performance between the valve body and the valve stem 1.

[0037] Reference Figure 1 and Figure 2The flexible protection component 3 includes a shaped ring 32, which is sleeved on the valve stem 1. In this embodiment, the material of the shaped ring 32 is preferably fluoroplastic. Fluoroplastics have good sealing performance and low coefficient of friction, which helps to reduce the friction between the valve stem 1 and the shaped ring 32. The shaped ring 32 is provided with an adapter groove 321 and a cone angle 322. The cone surface of the cone angle 322 forms an abutting fit with the valve body. When the shaped ring 32 is subjected to the action of the pressing structure 4, the cone angle 322 will also be pressed and fit more tightly in the gap between the valve body and the valve stem 1. At the same time, the shaped ring 32 will squeeze the valve stem 1 due to compression deformation, which improves the sealing effect.

[0038] Reference Figure 1 and Figure 2 The flexible sealing assembly 2 includes two wedge rings 22. Each wedge ring 22 is fitted with the adapter groove 321 of the shaped ring 32, and the wedge surfaces of the two wedge rings 22 form an abutment fit, so that the wedge ring 22 does not directly contact the valve stem 1, and the shaped ring 32 can isolate and protect the wedge ring 22. The wedge ring 22 near the valve body forms an abutment fit with the valve body. In this embodiment, the material of the wedge ring 22 is preferably flexible graphite. Flexible graphite has strong plasticity and good sealing performance, which helps to improve the sealing between the wedge ring 22, the shaped ring 32 and the valve body.

[0039] Reference Figure 1 and Figure 2 By utilizing the two wedge rings 22, the two wedge rings 22 are compressed and squeezed against each other under the action of the pressure holding structure 4. At the same time, the two wedge rings 22 squeeze the valve body respectively, and the two wedge rings 22 and the shaped ring 32 squeeze against each other and seal tightly. At this time, dynamic seals are formed between the two wedge rings 22, between any wedge ring 22 and the valve body, and between the shaped ring 32 and the valve stem 1, thereby improving the sealing performance between the valve body and the valve stem 1.

[0040] Reference Figure 1 and Figure 2 The flexible protection component 3 also includes a dustproof ring 33 for preventing external dust from entering the gap between the valve body and the valve stem 1. The dustproof ring 33 is sleeved on the valve stem 1, and the outer wall of the dustproof ring 33 forms an abutting fit with the valve body. The lower surface of the dustproof ring 33 forms an abutting fit with the upper surface of the wedge ring 22 and the upper surface of the irregular ring 32. Thus, the dustproof ring 33 can prevent external dust from entering the gap between the valve body and the valve stem 1, further ensuring the sealing between the valve body and the valve stem 1.

[0041] Reference Figure 1 and Figure 2In this embodiment, the material of the dustproof ring 33 is preferably fluoroplastic, which helps to reduce the friction between the dustproof ring 33 and the wedge ring 22 and between the dustproof ring 33 and the valve stem 1, reducing the possibility of friction damage to the valve stem 1 caused by dust accumulation. The dustproof ring 33 forms a sealed space with the valve stem 1 and the shaped ring 32. The sealed space is used to prevent the two wedge rings 22 from being squeezed out of the fitting groove 321 when under pressure, thus improving the sealing stability.

[0042] Reference Figure 1 and Figure 2 The pressure-holding structure 4 includes a pressure sleeve 41, which is sleeved on the valve stem 1. The outer wall of the pressure sleeve 41 forms an abutment fit with the valve body, and the lower surface of the pressure sleeve 41 forms an abutment fit with the upper surface of the dustproof ring 33. By utilizing the pressure-holding effect of the pressure sleeve 41, the flexible sealing component 2 and the flexible protection component 3 below the dustproof ring 33 can be more tightly fitted to the valve stem 1 and the valve body due to the pressure, thereby improving the sealing effect.

[0043] Reference Figure 1 and Figure 2 The pressure-holding structure 4 also includes a packing ring 42, which is used to hold the pressure sleeve 41, wedge ring 22 and shaped ring 32 below it. The packing ring 42 is threaded to the top of the valve stem 1, so that the operator can press the packing ring 42 downward by screwing it on, so that the flexible sealing component 2 and the flexible protection component 3 are deformed by pressure and pressed against the valve body and valve stem 1, thereby improving the sealing stability between the valve body and valve stem 1.

[0044] Reference Figure 1 and Figure 2 A disc spring 43 is provided between the pressure sleeve 41 and the packing ring 42. The disc spring 43 is sleeved on the valve stem 1, and the upper end of the disc spring 43 forms an abutting fit with the lower surface of the packing ring 42, while the lower end of the disc spring 43 forms an abutting fit with the upper surface of the pressure sleeve 41. Thus, after the disc spring 43 is subjected to the pressure of the packing ring 42, it will rebound and press the pressure sleeve 41 and the packing ring 42 tightly. The elastic effect of the disc spring 43 can make the pressure sleeve 41 and the packing ring 42 maintain continuous pressure on the flexible sealing assembly 2, thereby ensuring that the flexible sealing assembly 2 has a long-lasting sealing force.

[0045] The implementation principle of this application embodiment is as follows: In actual operation, the operator first puts the U-shaped protective ring 31 with the U-shaped sealing ring 21 on the valve stem 1, and then installs the valve stem 1 and the ball inside the valve body. Since there is a gap between the valve body and the valve stem 1, the operator puts the irregular ring 32 with two wedge rings 22 fixed, the dustproof ring 33, the pressure sleeve 41 and the disc spring 43 on the valve stem 1 in sequence, so that a preliminary seal is formed between the valve body and the valve stem 1.

[0046] Finally, the staff threaded the packing ring 42 onto the top of the valve stem 1. By screwing the packing ring 42 downward, the U-shaped sealing ring 21 and the U-shaped protective ring 31, as well as the wedge ring 22 and the irregular ring 32, achieved self-sealing due to pressure deformation. At the same time, the pressure deformation filled the local gap between the valve body and the valve stem 1, thereby improving the sealing stability between the valve body and the valve stem 1.

[0047] 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 for high-frequency switching, characterized in that: The valve includes a valve stem (1) rotatably connected to the valve body, on which a flexible sealing component (2), a flexible protective component (3) for protecting the flexible sealing component (2), and a pressing structure (4) for pressing the flexible sealing component (2) and the flexible protective component (3) together are provided, and the flexible protective component (3) forms an abutting fit with the valve body.

2. The valve stem sealing structure for high-frequency switching according to claim 1, characterized in that: The flexible protection component (3) includes a shaped ring (32), which is sleeved on the valve stem (1). The shaped ring (32) has a cone angle (322), and the cone surface of the cone angle (322) forms an abutment fit with the valve body.

3. The valve stem sealing structure for high-frequency switching according to claim 2, characterized in that: The flexible sealing assembly (2) includes two wedge rings (22), and the wedge surfaces of the two wedge rings (22) form an abutting fit. The irregular ring (32) is provided with an adapter groove (321) for the two wedge rings (22), and any one of the wedge rings (22) and the adapter groove (321) form a sleeve fit.

4. The valve stem sealing structure for high-frequency switching according to claim 1, characterized in that: The flexible sealing assembly (2) includes a U-shaped sealing ring (21), and the flexible protection assembly (3) includes a U-shaped protection ring (31). The U-shaped protection ring (31) is provided with a U-shaped groove (311). The U-shaped sealing ring (21) and the U-shaped groove (311) form an embedded fit. The U-shaped protection ring (31) is sleeved on the valve stem (1), and the outer wall of the U-shaped protection ring (31) forms an abutting fit with the valve body.

5. A valve stem sealing structure for high-frequency switching according to claim 3, characterized in that: The flexible protective component (3) includes a dustproof ring (33) for preventing external dust from entering the gap between the valve body and the valve stem (1). The dustproof ring (33) is sleeved on the valve stem (1), and a sealed space is formed between the dustproof ring (33), the valve stem (1), and the shaped ring (32) to prevent the wedge ring (22) from being squeezed out.

6. A valve stem sealing structure for high-frequency switching according to claim 5, characterized in that: The pressure holding structure (4) includes a pressure sleeve (41), which is sleeved on the valve stem (1) and forms an abutment fit with the dust ring (33).

7. A valve stem sealing structure for high-frequency switching according to claim 6, characterized in that: The pressing structure (4) includes a packing ring (42) for pressing the pressing sleeve (41), the packing ring (42) being threadedly connected to the top of the valve stem (1).

8. A valve stem sealing structure for high-frequency switching according to claim 7, characterized in that: A disc spring (43) is provided between the pressure sleeve (41) and the packing ring (42). The disc spring (43) is sleeved on the valve stem (1), and the upper end of the disc spring (43) forms an abutting fit with the packing ring (42), while the lower end of the disc spring (43) forms an abutting fit with the pressure sleeve (41).

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