Multi-sealing belt compensation ball valve

Abstract

The utility model discloses a multi-sealing compensation ball valve, which relates to the technical field of ball valves, and comprises a valve body, a valve seat, a ball body, a valve rod, a shell, a transmission shaft and a handle, and the valve seat is positioned between the outer side wall of the ball body and the inner side wall of the valve body so as to seal the joint between the ball body and the valve body; the lower packing is installed between the valve body and the valve rod, the upper packing is installed between the shell and the transmission shaft, a lower sealing pair is formed between the valve rod and the lower packing, an upper sealing pair is formed between the transmission shaft and the upper packing, and an upper pre-tightening disc spring and a lower pre-tightening disc spring which apply pre-tightening force to the upper packing and the lower packing are arranged on the upper packing and the lower packing respectively; the device further comprises a ball valve installed on the shell, a cavity is formed in the ball valve, a through hole communicated with the channel is formed in one side of the shell, and one end of the ball valve is inserted into the through hole so that the cavity can be communicated with the through hole. According to the utility model, a multi-sealing structure is adopted; and meanwhile, nitrogen sealing is added, the sealing performance of the valve is guaranteed, and leakage of harmful substances is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ball valves, and more specifically to a ball valve with multiple seals and compensation. Background Art

[0002] The ball valve is a valve whose opening and closing parts (valve body) are driven by the valve stem and rotate around the axis of the ball valve. It is used for regulating and controlling fluids. As a major type of valve, the ball valve has the characteristics of good wear resistance, excellent sealing, light switching, and long service life. It is widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries.

[0003] In some harsh working conditions, such as when the conveying medium contains highly toxic, corrosive, colorless and odorless toxic media, there are strict requirements for the sealing of ball valves. For example, when used in harsh working conditions such as the chemical industry containing highly toxic and severe corrosive media, ball valves usually need to be designed with multiple sealing structures to meet the sealing requirements under the current working conditions and prevent the leakage of toxic media. Utility Model Content

[0004] In view of this problem in practical application, the utility model aims to propose a multi-seal compensation ball valve, the specific scheme is as follows:

[0005] A multi-seal compensation ball valve, comprising a valve body with a flow channel, a valve seat arranged in the valve body, a ball located in the flow channel, a valve stem connected to the ball, a shell connected to the valve body and having a channel, a transmission shaft connected to the valve stem and passing through the channel, a handle connected to the top of the transmission shaft, the valve seat is located between the outer side wall of the ball and the inner side wall of the valve body to seal the connection between the ball and the valve body;

[0006] It also includes a lower packing installed between the valve body and the valve stem, and an upper packing installed between the housing and the transmission shaft, a lower sealing pair is formed between the valve stem and the lower packing, and an upper sealing pair is formed between the transmission shaft and the upper packing, and an upper preload disc spring and a lower preload disc spring are respectively provided on the upper packing and the lower packing to apply preload force thereto;

[0007] It also includes a ball valve installed on the shell, wherein a cavity is arranged inside the ball valve, a through hole connected to the channel is arranged on one side of the shell, and one end of the ball valve is inserted into the through hole so that the cavity is connected to the through hole.

[0008] Furthermore, the valve body is composed of a main valve body and a sub-valve body, and the two are connected by bolts.

[0009] Furthermore, a gasket is provided between the main valve body and the auxiliary valve body.

[0010] Furthermore, the valve seat is made of any polymer material including RPTFE-enhanced polytetrafluoroethylene, PEEK, and PPL.

[0011] Furthermore, a first positioning sleeve and a second positioning sleeve are provided between the valve stem and the main valve body, and the first positioning sleeve and the second positioning sleeve are located at the upper and lower parts of the lower packing and the lower preload disc spring;

[0012] A third positioning sleeve and a fourth positioning sleeve are provided between the transmission shaft and the housing, and the third positioning sleeve and the fourth positioning sleeve are located at the upper and lower parts of the upper filler and the upper preload disc spring.

[0013] Furthermore, the upper filler and the lower filler include an upper filler layer, a middle filler layer and a lower filler layer in sequence from top to bottom.

[0014] Furthermore, a limiting rod is provided at the bottom of the valve stem, an annular groove is provided on the inner wall of the main valve body, and the limiting rod radially extends toward the annular groove until the limiting rod is limited in the annular groove.

[0015] Furthermore, a positioning block is provided at the bottom of the limiting rod, and the positioning block is inserted into the sphere for positioning.

[0016] Furthermore, the valve stem, the limiting rod and the positioning block are an integrated structure.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] In the present application, the ball valve adopts a multiple sealing structure, including the sealing effect of the valve seat itself, the sealing at the packing and the further sealing of the preload spring. The multiple combined seals are used to improve the sealing performance of the ball valve and prevent the leakage of the medium. At the same time, nitrogen sealing is added to ensure the sealing performance of the valve. In the event of packing failure, non-toxic inert gas is forced to be input from the outside to prevent the leakage of toxic media and reduce the leakage of harmful substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an overall schematic diagram of an embodiment of the utility model;

[0020] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle part;

[0021] Figure 3 For this utility model Figure 1 A partial enlarged view of point B in the middle.

[0022] : Illustrations: 1. main valve body; 2. auxiliary valve body; 3. flow channel; 4. valve seat; 5. ball; 6. valve stem; 7. housing; 8. channel; 9. transmission shaft; 10. handle; 11. lower packing; 12. upper packing; 13. upper preload disc spring; 14. lower preload disc spring; 15. ball valve; 16. cavity; 17. through hole; 18. gasket; 19. first positioning sleeve; 20. second positioning sleeve; 21. third positioning sleeve; 22. fourth positioning sleeve; 23. upper packing; 24. middle packing; 25. lower packing; 26. limit rod; 27. annular groove; 28. positioning block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0024] like Figure 1 As shown, a multiple-seal compensated ball valve comprises a main valve body 1 and an auxiliary valve body 2 having a flow channel 3, wherein the main valve body 1 and the auxiliary valve body 2 are connected via bolts; further comprising a valve seat 4 arranged in the main valve body 1 and the auxiliary valve body 2, and a ball 5 located in the flow channel 3, wherein the upper and lower parts of the ball 5 are connected to the main valve body 1 and the auxiliary valve body 2, and the valve seat 4 is located between the outer wall of the ball 5 and the inner walls of the main valve body 1 and the auxiliary valve body 2 to seal the connection between the ball 5 and the main valve body 1 and the auxiliary valve body 2; further comprising a valve stem 6 connected to the ball 5, a shell 7 bolted to the main valve body 1 and having a channel 8, and a transmission shaft 9 fixedly connected to the valve stem 6 and passing through the channel 8, wherein a handle 10 is connected to the top of the transmission shaft 9.

[0025] When the valve is in use, the handle 10 transmits power to drive the transmission shaft 9, and the transmission shaft 9 drives the valve stem 6 and the ball 5 to rotate 90 degrees, thereby realizing the opening and closing functions of the valve.

[0026] Among them, the valve seat 4 serves as the first seal closest to the flow channel 3. The valve seat 4 is made of any polymer material among RPTFE enhanced polytetrafluoroethylene, PEEK, and PPL, and the valve seat 4 can perform preliminary sealing on the ball 5 in both the upper and lower directions to achieve bidirectional sealing and achieve zero leakage of the medium.

[0027] The multi-seal compensation ball valve also includes a lower packing 11 installed between the main valve body 1 and the valve stem 6, and an upper packing 12 installed between the housing 7 and the transmission shaft 9. A lower sealing pair is formed between the valve stem 6 and the lower packing 11, and an upper sealing pair is formed between the transmission shaft 9 and the upper packing 12. The upper sealing pair and the lower sealing pair form a multiple combined packing seal to prevent the valve from leaking out. The upper sealing pair and the lower sealing pair serve as the second seal to further improve the sealing performance of the valve.

[0028] And, if Figure 2As shown, the upper filler 12 and the lower filler 11 respectively include an upper filler 23, a middle filler 24 and a lower filler 25 from top to bottom. Figure 2 The diagram is a schematic diagram of the layer structure using the lower packing 12 as an example. The upper packing 12 and the lower packing 11 are respectively provided with an upper preload disc spring 13 and a lower preload disc spring 14 for applying preload force thereto. The upper preload disc spring 13 applies preload force to the three layers of packing on the upper packing 12, and the lower preload disc spring 14 applies preload force to the three layers of packing on the lower packing 11, to prevent the packing from leaking out due to temperature alternation and ensure the sealing of the valve stem 6. The preload disc spring, as the third seal, can further improve the sealing of the valve on the basis of the packing.

[0029] Back to Figure 1 The multi-seal compensation ball valve also includes a ball valve 15 installed on the housing 7. A cavity 16 is provided in the ball valve 15. A through hole 17 connected to the channel 8 is provided on one side of the housing 7. One end of the ball valve 15 is inserted into the through hole 17 so that the cavity 16 is connected to the through hole 17. If leakage occurs in the packing part, the ball valve 15 is opened and non-toxic inert gas such as nitrogen is forcibly pressed inward. The nitrogen enters the channel 8 in the housing 7 through the cavity 16 and the through hole 17 to achieve forced sealing, prevent the leakage of toxic media, and reduce the leakage of harmful substances. Forced nitrogen pressing is the last seal as a compensation sealing measure.

[0030] Combined with the above-mentioned multiple combined seals, the sealing performance of the valve is effectively improved as a whole.

[0031] In addition, a gasket 18 is provided between the main valve body 1 and the auxiliary valve body 2. The gasket 18 is used to ensure the tightness between the main valve body 1 and the auxiliary valve body 2 to prevent leakage of the medium.

[0032] A first positioning sleeve 19 and a second positioning sleeve 20 are provided between the valve stem 6 and the main valve body 1, and the first positioning sleeve 19 and the second positioning sleeve 20 are located at the upper and lower parts of the lower packing 11 and the lower preload disc spring 14. The first positioning sleeve 19 and the second positioning sleeve 20 cooperate to realize the double positioning of the valve stem 6, ensure the concentricity of the valve stem 6 and the valve body, and prevent the valve stem 6 from being strained. A third positioning sleeve 21 and a fourth positioning sleeve 22 are provided between the transmission shaft 9 and the housing 7, and the third positioning sleeve 21 and the fourth positioning sleeve 22 are located at the upper and lower parts of the upper packing 12 and the upper preload disc spring 13. Similarly, the third positioning sleeve 21 and the fourth positioning sleeve 22 cooperate to realize the double positioning of the transmission shaft 9, ensure the concentricity of the transmission shaft 9 and the housing 7, and prevent the transmission shaft 9 from being strained.

[0033] Furthermore, if Figure 3As shown, a limiting rod 26 is provided at the bottom of the valve stem 6, and an annular groove 27 is provided on the inner wall of the main valve body 1. The limiting rod 26 extends radially toward the main valve body 1 so that the limiting rod 26 is limited in the annular groove 27. The limiting rod 26 and the annular groove 27 cooperate with each other to prevent the valve stem 6 from flying out and avoid accidental injury.

[0034] A positioning block 28 is provided at the bottom of the limiting rod 26, and the positioning block 28 is inserted into the ball 5 for positioning. The insertion positioning structure prevents the ball 5 from being displaced too much, thereby ensuring the sealing performance of the valve.

[0035] In one possible embodiment, the valve stem 6, the limit rod 26, and the positioning block 28 are an integrated structure. The integrated structure is formed by integral injection molding, which is convenient for production. In another possible embodiment, the valve stem 6, the limit rod 26, and the positioning block 28 are a split structure, and the valve stem 6 and the limit rod 26, and the limit rod 26 and the positioning block 28 can be fixedly connected by bolts. The split structure is convenient for replacement when the components are damaged, saving costs.

[0036] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A multi-seal compensation ball valve, comprising a valve body with a flow channel, a valve seat arranged in the valve body, a ball located in the flow channel, a valve stem connected to the ball, a shell connected to the valve body and having a channel, a transmission shaft connected to the valve stem and passing through the channel, a handle connected to the top of the transmission shaft, characterized in that: The valve seat is located between the outer wall of the ball and the inner wall of the valve body to seal the connection between the ball and the valve body; It also includes a lower packing installed between the valve body and the valve stem, and an upper packing installed between the housing and the transmission shaft, a lower sealing pair is formed between the valve stem and the lower packing, and an upper sealing pair is formed between the transmission shaft and the upper packing, and an upper preload disc spring and a lower preload disc spring are respectively provided on the upper packing and the lower packing to apply preload force thereto; It also includes a ball valve installed on the shell, wherein a cavity is arranged inside the ball valve, a through hole connected to the channel is arranged on one side of the shell, and one end of the ball valve is inserted into the through hole so that the cavity is connected to the through hole.

2. The multi-seal compensating ball valve according to claim 1, characterized in that: The valve body is composed of a main valve body and an auxiliary valve body, and the two are connected by bolts.

3. The multi-seal compensating ball valve according to claim 2, characterized in that: A gasket is arranged between the main valve body and the auxiliary valve body.

4. The multi-seal compensating ball valve according to claim 1, characterized in that: The valve seat is made of any polymer material among RPTFE enhanced polytetrafluoroethylene, PEEK and PPL.

5. The multi-seal compensating ball valve according to claim 2, characterized in that: A first positioning sleeve and a second positioning sleeve are provided between the valve stem and the main valve body, and the first positioning sleeve and the second positioning sleeve are located at the upper and lower parts of the lower packing and the lower preload disc spring; A third positioning sleeve and a fourth positioning sleeve are provided between the transmission shaft and the housing, and the third positioning sleeve and the fourth positioning sleeve are located at the upper and lower parts of the upper filler and the upper preload disc spring.

6. The multi-seal compensating ball valve according to claim 1, characterized in that: The upper filler and the lower filler both include an upper filler layer, a middle filler layer and a lower filler layer in sequence from top to bottom.

7. The multi-seal compensating ball valve according to claim 2, characterized in that: A limiting rod is provided at the bottom of the valve stem, an annular groove is provided on the inner wall of the main valve body, and the limiting rod radially extends toward the annular groove until the limiting rod is limited in the annular groove.

8. The multi-seal compensating ball valve according to claim 7, characterized in that: A positioning block is provided at the bottom of the limiting rod, and the positioning block is inserted into the sphere for positioning.

9. The multi-seal compensating ball valve according to claim 8, characterized in that: The valve stem, the limiting rod and the positioning block are an integrated structure.

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