CN116697085A

CN116697085A - High-tightness ball valve

Info

Publication number: CN116697085A
Application number: CN202310701462.5A
Authority: CN
Inventors: 汪春臣; 郑益丰; 陈齐飞; 李芳�; 任飞龙; 李森
Original assignee: WUZHOU VALVE CO LTD
Current assignee: WUZHOU VALVE CO LTD
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-09-05
Anticipated expiration: 2043-06-13
Also published as: CN116697085B

Abstract

The application relates to the field of ball valves, and particularly discloses a high-tightness ball valve which comprises a valve body, a sleeve arranged on the valve body and a valve rod rotatably arranged on a valve seat and the sleeve, wherein a rod grease injection groove is formed in the inner wall of the sleeve, a rod grease injection valve is arranged on the outer wall of the sleeve, and an inner cavity of the rod grease injection valve is communicated with the rod grease injection groove. The application has the effect of keeping high sealing performance between the valve rod and the sleeve for a long time.

Description

High-tightness ball valve

Technical Field

The application relates to the field of ball valves, in particular to a high-tightness ball valve.

Background

Ball valves are widely used in petrochemical industry, coal chemical industry and other industries because of the advantages of full diameter, large flow, convenient opening and closing, low flow resistance and the like, but the working conditions in the industries are generally severe, and the phenomena of high temperature, high pressure, toxicity, harmfulness, solid particles and the like are commonly present.

Many high-risk gases are transported by the ball valve, and the sealing requirements for the ball valve are more stringent when transporting high-risk gases. Highly toxic gases such as hydrogen sulfide have serious consequences once the leak is inhaled by a person.

In the opening and closing process of the ball valve, the valve rod is required to rotate, and even if a sealing ring is arranged between the valve rod and the valve rod sleeve, the ball valve is easy to wear due to frequent rotation of the valve rod, so that the sealing performance of the ball valve is affected. The sealing ring between the valve rod and the ball valve is replaced, the valve cover and the valve rod sleeve are required to be removed, the operation is complex, the time consumption is long, the continuous transmission of a pipeline applying the ball valve is affected, and the improvement is needed.

Disclosure of Invention

The application provides a high-tightness ball valve, which can keep high tightness between a valve rod and a sleeve for a long time.

The application provides a high-tightness ball valve which adopts the following technical scheme:

the utility model provides a high leakproofness ball valve, includes the valve body, sets up the sleeve pipe on the valve body and rotates the valve rod that sets up on disk seat and sleeve pipe, the pole annotates the fat groove has been seted up on the sheathed tube inner wall, be provided with the pole on the sheathed tube outer wall and annotate the fat valve, the inner chamber of pole annotates the fat valve is linked together with the pole annotates the fat groove.

By adopting the technical scheme, after the ball valve is used for a long time, sealing grease is injected into the rod grease injection valve, and enters the grease injection groove through the rod grease injection valve, so that the rod grease injection groove is filled with the sealing grease, and the sealing effect is achieved. Compared with the process of removing the valve cover and the sleeve and replacing the sealing ring, the sealing grease is used for sealing, on one hand, the valve rod is lubricated, and on the other hand, the valve rod and the sleeve can keep high sealing performance for a long time under the condition that the valve cover and the sleeve are not required to be removed, so that the maintenance simplicity of the ball valve is improved, and meanwhile, a pipeline applying the ball valve can be continuously transmitted for a long time.

Optionally, a plurality of rod sealing ring grooves are formed in the inner wall of the sleeve, rod sealing rings are arranged in the rod sealing ring grooves, and the rod sealing rings are abutted against the groove walls of the rod sealing ring grooves and the side walls of the valve rod.

Through adopting above-mentioned technical scheme, compare and seal through only a pole sealing washer, through setting up a plurality of pole sealing washer, further improved the leakproofness between valve rod and the sleeve pipe to the high dangerous gaseous loss of transmission in the restriction valve body outside the valve body.

Optionally, still include the spheroid and be used for the disk seat of contradicting with the spheroid, spheroid and disk seat all set up in the valve body, first intercommunication annular has been seted up on the disk seat is used for the terminal surface that the spheroid contradicted, the second intercommunication annular has been seted up on the circumference outer wall of disk seat, set up the intercommunication groove that is linked together with the second intercommunication annular on the cell wall of first intercommunication annular.

Through the adoption of the technical scheme, the sealing area between the valve seat and the ball body and the friction force born by the ball body during rotation are reduced through the first communication annular groove, the communication groove and the second communication annular groove, so that the force required to be applied during operation of the ball body is reduced, the ball body is easier to control, and meanwhile, the stability of the ball valve is improved during operation.

Optionally, a seat grease injection valve is arranged on the valve body, and an inner cavity of the seat grease injection valve is communicated with the second communication ring groove.

Through adopting above-mentioned technical scheme, through injecting into the seat grease injection valve and annotating the sealing grease in, after the sealing grease is annotated the grease valve through the seat and is got into the second intercommunication annular, through linking groove and first intercommunication annular input to between spheroid and the disk seat to reduce the wearing and tearing between spheroid and the disk seat. The ball valve is beneficial to the rotation of the ball, ensures the sealing effect between the ball and the valve seat, and can prolong the service life of the ball and the valve seat so as to reduce the replacement and overhaul frequency of the ball.

Optionally, at least two seat sealing ring grooves are formed in the circumferential side wall of the valve seat, the second communication ring groove is located between the two seat sealing ring grooves, a seat sealing ring is arranged in the seat sealing ring groove, and the seat sealing ring abuts against the groove wall of the seat sealing ring groove and the inner wall of the valve body.

Through adopting above-mentioned technical scheme, two seat sealing washer have all played the effect of reinforcing leakproofness between disk seat and the valve body, and the second intercommunication annular is located between two seat sealing annular, has not only restricted the sealing grease and has got into the valve body by the gap between disk seat and the valve body, still helps sealing grease to get into in the second intercommunication annular.

Optionally, a fireproof ring is arranged on the valve seat.

Through adopting above-mentioned technical scheme, when transmitting inflammable gas such as hydrogen sulfide in the valve body, through addding the fire collar, even gas takes place to burn, the fire collar can take place to expand and prevent inflammable gas to leak to play the effect of fire at safety protection.

Optionally, the gas collecting device further comprises an early warning assembly, wherein the early warning assembly comprises an early warning pipe and an early warning air bag, a gas collecting groove is formed in the inner wall of the sleeve, and the early warning pipe is communicated with the inner cavity of the early warning air bag and the gas collecting groove.

Through adopting above-mentioned technical scheme, after the high dangerous gas of transmission in the valve body was revealed to the gas collecting channel, gas got into in the early warning gasbag through the trachea for early warning gasbag takes place to expand, thereby plays the effect of warning, helps the staff to discover when patrolling and examining that high dangerous gas takes place to leak, so that the staff in time handles the ball valve leakage, and then reduces the harm that the gas leakage brought.

Optionally, the device further comprises a ball body rotatably arranged in the valve body, a grease injection assembly for injecting sealing grease and a blocking assembly for controlling the grease injection assembly to inject the sealing grease, wherein the gas collecting tank is positioned at one side of the rod grease injection tank, which is close to the ball body;

the grease injecting component comprises an injection cylinder, an injection block arranged in the injection cylinder in a sliding way, an injection push rod connected to the injection block, an injection push block connected to the injection push rod and an injection spring used for driving the injection block to move towards the direction close to the grease injecting groove of the rod, wherein the injection cylinder is connected to the sleeve, the inner cavity of the injection cylinder is communicated with the grease injecting groove of the rod, one end of the injection push rod penetrates through the outside of the injection sleeve and is connected with the injection push block,

the blocking assembly comprises an injection stop block and a telescopic air bag for driving the injection stop block to move, the injection stop block can move to the position between the injection push block and the injection block, the injection stop block can also move to the position on a moving path of the injection push block, the telescopic air bag is connected with the early warning air bag through an air pipe, and when the telescopic air bag is fully extended, the injection stop block moves out of the moving path of the injection push block.

By adopting the technical scheme, in the assembling process of the ball valve, sealing grease is injected into the injection cylinder in advance. After the high-risk gas transmitted in the valve body leaks into the gas collecting tank, the gas enters the telescopic airbag through the gas pipe and the early warning airbag. Along with the continuous input of gas, the early warning gasbag takes place to expand, and flexible gasbag extension is until flexible gasbag full extension, and flexible gasbag drive injection dog shifts out on the injection ejector pad and the injection piece this moment. Under the action of the injection spring, the injection pushing block moves towards the direction close to the grease injection groove, so that the sealing grease is pushed out of the injection cylinder, enters and fills the rod sealing ring groove, and the sealing effect is achieved.

So set up for after high dangerous gas revealed and reach a certain amount, under the effect of blocking subassembly and early warning subassembly, annotate the fat subassembly and pour into sealed grease into the pole seal ring groove automatically, compare in waiting to reveal the back, the staff is manual to pour into sealed grease through annotating the fat valve, so the setting can effectively restrict gas and continue revealing, reduces the harm that high dangerous gas revealed and caused as far as possible.

Optionally, the blocking assembly further comprises a return spring connected to the injection block, and the injection block is located on the moving path of the injection pushing block when the return spring is in a natural state.

Through adopting above-mentioned technical scheme, through add reset spring on injection dog for injection dog can keep oneself to be located the removal route of injection push block, in order to block the injection push block. By the arrangement, the situation that the injection stop block moves out of the moving path of the injection pushing block due to the vibration of the valve body and the like is avoided as much as possible, and the injection stop block is also helped to reset to the moving path of the injection pushing block.

Optionally, the fat injection assembly further comprises a sealing cover connected with the sleeve, and the injection cylinder, the injection block, the injection push rod, the injection push block, the injection spring and the blocking assembly are all located in the sealing cover.

By adopting the technical scheme, as the injection cylinder, the injection block, the injection push rod, the injection push block, the injection spring and the blocking component are all positioned in the sealing cover, the leakage of dangerous gas can be as high as possible, and the high tightness of the ball valve is effectively ensured.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after the ball valve is used for a long time, the sealing grease is filled into the grease filling groove of the rod through the grease filling valve of the rod so as to lubricate the valve rod and the sleeve, and meanwhile, the valve rod and the sleeve can keep high sealing performance for a long time, so that the maintenance simplicity of the ball valve is improved;

2. through the first communication ring groove, the communication groove, the second communication ring groove and the seat sealing grease, the sealing grease can be filled between the ball body and the valve seat, so that the contact surfaces of the ball body and the valve seat can be protected, and friction received by the ball body during rotation is reduced;

3. after add early warning subassembly, stop the subassembly and annotate the fat subassembly for high dangerous gas in the valve body is revealed to the back of a certain amount, annotates the fat subassembly and can annotate the fat inslot to the pole and annotate the sealed fat, in order to play sealed effect, thereby restrict high dangerous gas and continue to reveal, compare in the staff find after revealing wait to reveal after manual through annotating the fat valve and annotate sealed fat, so set up and can reduce the harm that high dangerous gas revealed and cause as far as possible.

Drawings

Fig. 1 is a schematic structural view of embodiment 1 of the present application.

Fig. 2 is a schematic cross-sectional view of embodiment 1 of the present application.

Fig. 3 is an enlarged schematic view at a in fig. 2.

FIG. 4 is a schematic cross-sectional view of a stick grease injection valve according to an embodiment of the present application.

Fig. 5 is an enlarged schematic view at B in fig. 4.

Fig. 6 is a schematic partial cross-sectional view of embodiment 2 of the present application.

Fig. 7 is an enlarged schematic view at C in fig. 6.

Reference numerals illustrate:

1. a valve body; 11. a sphere; 12. a valve seat; 121. a first communication ring groove; 122. a second communication ring groove; 123. a fireproof groove; 124. a seat seal ring groove; 125. a communication groove; 126. a seat sealing ring; 127. a fire collar; 13. a valve stem; 14. a sleeve; 141. a rod grease injection groove; 142. a rod sealing ring groove; 143. a rod seal ring; 144. a gas collecting tank; 15. a valve cover; 16. a seat grease injection valve; 2. a rod grease injection valve; 21. a valve body; 211. a fat injection cavity; 212. sealing the cavity; 213. a communication port; 22. an end cap; 23. a sealing ball; 24. a seal spring; 3. an early warning component; 31. an early warning pipe; 32. early warning the air bag; 4. a blocking assembly; 41. an injection stop; 411. resetting the inclined plane; 412. an air bag seat; 42. a fixing frame; 43. a telescopic air bag; 44. a return spring; 5. a grease injection assembly; 51. a sealing cover; 511. a spring groove; 52. a syringe; 53. an injection block; 54. an injection push rod; 55. an injection pushing block; 56. and (5) injecting a spring.

Detailed Description

The application is described in further detail below with reference to fig. 1-7.

The embodiment of the application discloses a high-tightness ball valve.

Example 1:

referring to fig. 1 and 2, the high-tightness ball valve includes a valve body 1, a ball 11 rotatably provided in the valve body 1, two valve seats 12 for sealing, a valve stem 13 connected to the valve body 1, a sleeve 14 fixed to the valve body 1, and a valve cover 15 fixed to the sleeve 14.

Referring to fig. 2 and 3, two valve seats 12 are fixed in the valve body 1, the two valve seats 12 are respectively located at two sides of the sphere 11, and the two valve seats 12 are used for abutting against the sphere 11. The end face of the valve seat 12, which is used for abutting against the ball 11, is provided with a first communication ring groove 121, and the circumferential outer wall of the valve seat 12 is provided with a second communication ring groove 122, a fireproof groove 123 and two seat sealing ring grooves 124. The groove walls of the first communication groove 121 are provided with a plurality of communication grooves 125, each communication groove 125 is uniformly distributed circumferentially around the axis of the valve seat 12, and the communication grooves 125 are communicated with the first communication groove 121 and the second communication groove 122.

Referring to fig. 2 and 3, two grease injection valves 16 are fixed to the valve body 1, the two grease injection valves 16 are aligned with different second communication ring grooves 122, and the inner one of the two grease injection valves 16 is communicated with different second communication ring grooves 122. By the two grease injection valves, sealing grease can be injected into the second communication ring groove 122 which is different from the outside of the valve body 1, and the sealing grease is filled between the ball 11 and the valve seat 12 through the communication groove 125 and the first communication ring groove 121.

Referring to fig. 3, two sealing ring grooves 124 are respectively located at two sides of the second communication ring groove 122, and seat sealing rings 126 are respectively disposed in the two sealing ring grooves 124, and the sealing rings abut against the groove walls of the seat sealing ring grooves 124 and the inner cavity of the valve body 1, so as to improve the tightness between the valve seat 12 and the valve body 1 and limit the sealing grease from entering the valve body 1.

Referring to fig. 3, a fire collar 127 is disposed in the fire-proof groove 123, and the fire collar 127 can expand when encountering high temperature, so as to prevent flammable gas in the valve body 1 from escaping outwards when the flammable gas is transmitted in the valve body 1 and burnt, thereby effectively improving the fire-proof performance of the ball valve of the application.

Referring to fig. 4 and 5, one end of the valve rod 13 extends into the valve body 1 and is fixedly connected with the ball 11, and the ball 11 can be driven to rotate by rotation of the valve rod 13. The valve rod 13 is arranged in the sleeve 14 in a penetrating way, and the valve rod 13 is rotatably arranged on the sleeve 14 and the valve cover 15. The inner walls of the valve cover 15 and the sleeve 14 are provided with a rod grease injection groove 141 and two rod seal ring grooves 142, the two rod seal ring grooves 142 are distributed along the axial direction of the sleeve 14, and the rod grease injection groove 141 is positioned at one side of the rod seal ring groove 142 far away from the ball 11. The two rod sealing ring grooves 142 are provided with rod sealing rings 143, the rod sealing rings 143 are sleeved on the valve rod 13, and the rod sealing rings 143 are abutted against the groove walls of the rod sealing ring grooves 142 and the side walls of the valve rod 13.

Referring to fig. 2 and 5, the stem fat injection valve 2 is fixed on the sleeve 14, the stem fat injection valve 2 and the seat fat injection valve 16 each include a valve body 21, an end cap 22, a sealing ball 23 and a sealing spring 24, a fat injection cavity 211, a sealing cavity 212 and a communication port 213 communicating the fat injection cavity 211 with the sealing cavity 212 are formed on the valve body 21, and the end cap 22 is screwed on the valve body 21 to open and close an opening of the fat injection cavity 211. The sealing ball 23 is slidably arranged in the sealing cavity 212 and used for opening and closing the joint of the communication port 213 and the sealing cavity 212, the sealing spring 24 is connected to the sealing ball 23, the sealing spring 24 is used for driving the sealing ball 23 to shield the joint of the communication port 213 and the sealing cavity 212, and the sealing cavity 212 is communicated with the rod grease injecting groove 141.

The implementation principle of the embodiment 1 is as follows: after the ball valve is used for a long time, the end cover 22 of the rod grease injection valve 2 is opened, sealing grease is injected into the grease injection cavity 211, the sealing grease enters the communication port 213 through the grease injection cavity 211 and is pressed against the sealing ball 23, the sealing ball 23 moves, so that the sealing grease can flow into the sealing cavity 212 and finally flows into the rod grease injection groove 141, and therefore lubrication and sealing are carried out between the valve rod 13 and the sleeve 14. In the same way, the sealing grease is injected through the seat grease injection valve 16, so that the sealing grease can be filled between the ball 11 and the valve seat 12, and the protection, sealing and lubrication functions are realized.

Compared with the arrangement that the valve cover 15 and the sleeve 14 are disassembled to replace the rod sealing ring 143, the valve rod 13 and the sleeve 14 can maintain high sealing performance for a long time, so that a pipeline applying the ball valve can be continuously transmitted for a long time.

Example 2:

referring to fig. 6, the present embodiment is different from embodiment 1 in that it further includes an early warning component 3, a blocking component 4, and a fat injection component 5.

Referring to fig. 6, the warning assembly 3 includes a warning tube 31 and a warning balloon 32 fixed to the outer wall of the sleeve 14. The inner wall of the sleeve 14 is provided with a gas collecting groove 144, and the gas collecting groove 144 is positioned on one side of the rod grease injection groove 141 close to the ball 11 and one side of the rod sealing ring groove 142 far away from the ball 11. The early warning pipe 31 is fixed on the sleeve pipe 14, and the one end and the gas collecting channel 144 intercommunication of early warning pipe 31, the other end and the early warning gasbag 32 fixed connection of early warning pipe 31, and the inner chamber and the early warning gasbag 32 of early warning pipe 31 are linked together. When the ball valve is operating normally, the warning balloon 32 is in a deflated condition. When the gas leakage occurs between the valve rod 13 and the sleeve 14, the leaked gas enters the early warning air bag 32 through the gas collecting groove 144 and the early warning pipe 31, so that the early warning air bag 32 is inflated to warn the patrolling personnel.

Referring to fig. 6, the grease injection assembly 5 is for injecting sealing grease into the grease injection groove 141, and the grease injection assembly 5 includes a sealing cap 51, an injection cylinder 52 fixed in the sealing cap 51, an injection block 53 slidably disposed in the injection cylinder 52, an injection push rod 54 for driving the injection block 53 to move, an injection push rod 55 for driving the injection push rod 54 to move, and a plurality of injection springs 56 for driving the injection push rod 55 to move, the injection cylinder 52, the injection block 53, the injection push rod 54, the injection push rod 55, and the respective injection springs 56 being located in the sealing cap 51.

Referring to fig. 6, the inside of the syringe 52 is filled with the sealing resin, the cavity of the syringe 52 is communicated with the rod resin injection groove 141, and the sealing resin in the syringe 52 can be pushed out and pushed into the rod resin injection groove 141 by moving the syringe 53. One end of an injection push rod 54 extends into the injection cylinder 52 and is fixedly connected with the injection block 53, the other end of the injection push rod 54 penetrates out of the injection cylinder 52 and is fixedly connected with the injection push block 55, and the injection push rod 54 is arranged on the injection cylinder 52 in a sliding mode along the sliding direction of the injection block 53. The injection pushing block 55 is made of iron, and the injection pushing block 55 can be moved by attracting the injection pushing block 55 with a magnet in the sealing cover 51.

Referring to fig. 6, the extension and contraction direction of the injection spring 56 is identical to the sliding direction of the injection block 53, both ends of the injection spring 56 are fixedly connected with the injection push block 55 and the sealing cover 51, respectively, and the injection spring 56 is used for driving the injection push block 55 to move in a direction approaching the rod fat injection groove 141.

Referring to fig. 6 and 7, the blocking unit 4 is provided in the sealing cover 51, and the blocking unit 4 slides the injection stopper 41 provided in the sealing cover 51, the fixing frame 42 fixed in the sealing cover 51, the two telescopic airbags 43 capable of being extended and retracted, and the return spring 44 for driving the injection stopper 41 to return.

Referring to fig. 6 and 7, the sliding direction of the injection stopper 41 is perpendicular to the sliding direction of the injection pushing block 55, the injection stopper 41 can move to be located between the injection pushing block 55 and the injection pushing block 53 to block the injection pushing block 55, and the injection stopper 41 can also move to a moving path of moving out of the injection pushing block 55. The end of the injection stop 41 for abutting against the injection pushing block 55 is provided with a reset slope 411, the reset slope 411 faces the injection cylinder 52, and the reset slope 411 is used for abutting against the injection stop 41.

Referring to fig. 6 and 7, the airbag seats 412 are fixed to both rear side walls of the injection stopper 41, and the two telescopic airbags 43 are respectively provided on the different airbag seats 412. One end of the telescopic airbag 43 is fixedly connected with the fixed seat, the other end of the telescopic airbag 43 is fixedly connected with the adjacent airbag seat 412, and the telescopic airbag 43 stretches along the moving direction of the injection stop block 41. The two telescopic air bags 43 are connected with the early warning air bag 32 through air pipes, namely the inner cavity of the telescopic air bag 43 is communicated with the inner cavity of the early warning air bag 32. When the telescopic balloon 43 is fully extended, the injection stopper 41 moves out of the moving path of the injection pushing block 55.

Referring to fig. 6 and 7, a spring groove 511 is formed in the inner wall of the seal cover 51, and a return spring 44 is provided in the spring groove 511, and the airbag seat 412 and the end of the injection stopper 41 are slidably provided in the spring groove 511. The extension and contraction direction of the return spring 44 is identical to the sliding direction of the injection stopper 41, and both ends of the return spring 44 are fixedly connected to the injection stopper 41 and the bottom of the spring groove 511, respectively. When the return spring 44 is in the natural state, the injection stopper 41 is positioned on the movement path of the injection pushing block 55.

The implementation principle of the embodiment 2 is as follows: when gas leaks between the valve rod 13 and the sleeve 14, the gas enters the pre-warning pipe 31, the pre-warning air bag 32 and the air pipe connecting the pre-warning air bag 32 and the telescopic air bag 43 through the gas collecting groove 144 into the telescopic air bag 43, the telescopic air bag 43 gradually stretches to be completely stretched, and the air bag seat 412 drives the injection stop block 41 to move so that the injection stop block 41 moves out between the injection push block 55 and the injection block 53. The injection pushing block 55, the injection pushing rod 54, and the injection block 53 are moved by the injection spring 56 to push the sealing grease in the syringe 52 into the rod sealing ring groove 142. Compared with the process of detecting the gas leakage and then processing the gas leakage by the inspection of the staff, the valve rod 13 and the sleeve 14 are arranged in such a way that the sealing grease can be automatically filled when the gas leakage occurs between the valve rod 13 and the sleeve 14, so that the gas leakage is prevented, the timeliness of the gas leakage process is greatly improved, and the harm caused by the gas leakage is reduced.

When the injection pushing block 55 is reset, the injection pushing block 55 is attracted by the magnet to move and reset, the injection pushing block 55 is propped against the reset inclined plane 411, so that the injection stop block 41 moves out of the moving path of the injection pushing block 55, and when the injection pushing block 55 is not propped against the injection stop block 41 any more, the injection stop block 41 is reset under the action of the reset spring 44.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. The utility model provides a high leakproofness ball valve, includes valve body (1), sleeve pipe (14) and rotation setting on disk seat (12) and sleeve pipe (14) on valve body (1) valve rod (13), its characterized in that: the inner wall of the sleeve (14) is provided with a rod grease injection groove (141), the outer wall of the sleeve (14) is provided with a rod grease injection valve (2), and the inner cavity of the rod grease injection valve (2) is communicated with the rod grease injection groove (141).

2. The high tightness ball valve of claim 1 wherein: a plurality of rod sealing ring grooves (142) are formed in the inner wall of the sleeve (14), rod sealing rings (143) are arranged in each rod sealing ring groove (142), and the rod sealing rings (143) are abutted against the groove walls of the rod sealing ring grooves (142) and the side walls of the valve rod (13).

3. The high tightness ball valve of claim 1 wherein: still include spheroid (11) and be used for with spheroid (11) contradicted disk seat (12), spheroid (11) and disk seat (12) all set up in valve body (1), first intercommunication annular (121) have been seted up on disk seat (12) are used for on the terminal surface that spheroid (11) contradicted, second intercommunication annular (122) have been seted up on the circumference outer wall of disk seat (12), intercommunication groove (125) that are linked together with second intercommunication annular (122) have been seted up on the cell wall of first intercommunication annular (121).

4. A high tightness ball valve according to claim 3, wherein: the valve body (1) is provided with a seat grease injection valve (16), and the inner cavity of the seat grease injection valve (16) is communicated with the second communication annular groove (122).

5. A high tightness ball valve according to claim 3, wherein: at least two seat seal ring grooves (124) are formed in the circumferential side wall of the valve seat (12), the second communication ring groove (122) is located between the two seat seal ring grooves (124), a seat seal ring (126) is arranged in the seat seal ring groove (124), and the seat seal ring (126) abuts against the groove wall of the seat seal ring groove (124) and the inner wall of the valve body (1).

6. A high tightness ball valve according to claim 3, wherein: a fireproof ring (127) is arranged on the valve seat (12).

7. The high tightness ball valve according to claim 2, wherein: the intelligent early warning device is characterized by further comprising an early warning assembly (3), wherein the early warning assembly (3) comprises an early warning pipe (31) and an early warning air bag (32), an air collecting groove (144) is formed in the inner wall of the sleeve (14), and the early warning pipe (31) is communicated with the inner cavity of the early warning air bag (32) and the air collecting groove (144).

8. The high tightness ball valve according to claim 7, wherein: the sealing grease injection device is characterized by further comprising a ball body (11) rotatably arranged in the valve body (1), a grease injection component (5) for injecting sealing grease and a blocking component (4) for controlling the grease injection component (5) to inject the sealing grease, wherein the air collecting groove (144) is positioned at one side of the rod grease injection groove (141) close to the ball body (11);

the grease injection assembly (5) comprises a syringe (52), an injection block (53) arranged in the syringe (52) in a sliding manner, an injection push rod (54) connected to the injection block (53), an injection push block (55) connected to the injection push rod (54) and an injection spring (56) used for driving the injection block (53) to move towards a direction close to a rod grease injection groove (141), wherein the syringe (52) is connected to the sleeve (14), the inner cavity of the syringe (52) is communicated with the rod grease injection groove (141), and one end of the injection push rod (54) penetrates out of the sleeve (14) and is connected with the injection push block (55);

the blocking assembly (4) comprises an injection stop block (41) and a telescopic airbag (43) for driving the injection stop block (41) to move, the injection stop block (41) can move to a position between an injection pushing block (55) and an injection block (53), the injection stop block (41) can also move to a position on a moving path of moving out of the injection pushing block (55), the telescopic airbag (43) is connected with an early warning airbag (32) through an air pipe, and when the telescopic airbag (43) is fully extended, the injection stop block (41) moves out of the moving path of the injection pushing block (55).

9. The high tightness ball valve according to claim 8, wherein: the blocking assembly (4) further comprises a return spring (44) connected to the injection stop block (41), wherein the injection stop block (41) is positioned on the moving path of the injection pushing block (55) when the return spring (44) is in a natural state.

10. The high tightness ball valve according to claim 8, wherein: the grease injection assembly (5) further comprises a sealing cover (51) connected with the sleeve (14), and the injection cylinder (52), the injection block (53), the injection push rod (54), the injection push block (55), the injection spring (56) and the blocking assembly (4) are all located in the sealing cover (51).