CN111981155B

CN111981155B - Forced double-shutoff friction-free upper-mounted ball valve

Info

Publication number: CN111981155B
Application number: CN202010653115.6A
Authority: CN
Inventors: 郑建军; 张阳秀; 郑坤明; 张�浩; 宣中宝; 林利平
Original assignee: Zhejiang Flow Tech Machinery Co ltd
Current assignee: Zhejiang Flow Tech Machinery Co ltd
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2022-02-18
Anticipated expiration: 2040-07-08
Also published as: CN111981155A

Abstract

The invention discloses a forced double-shutoff friction-free top-mounted ball valve which comprises a valve body, a valve cover, a front valve seat, a rear valve seat and a valve rod, wherein a driving device is arranged at one end of the valve rod, which is far away from a ball body, and the driving device can drive the valve rod to rotate in the circumferential direction or slide axially relative to the valve rod; vacuum oil chambers and retreat areas are arranged between the front valve seat, the rear valve seat and the valve body; when the driving device axially slides towards the direction close to the valve rod, hydraulic oil is filled in the vacuum oil chambers of the front valve seat and the rear valve seat, and the front valve seat and the rear valve seat are respectively abutted and sealed with the ball body; when the driving device axially slides in the direction far away from the valve rod, hydraulic oil is pumped out of the vacuum oil chamber, and under the pressure of a medium, the front valve seat and the rear valve seat move towards the retreat area, so that gaps exist between the front valve seat and the ball body. The invention has the following advantages and effects: the ball valve realizes frictionless sealing between a ball body and a valve seat by utilizing a sealing oil way system.

Description

Forced double-shutoff friction-free upper-mounted ball valve

Technical Field

The invention relates to a ball valve, in particular to a forced double-shutoff friction-free upper-mounted ball valve.

Background

A ball valve is a valve which is driven by a valve stem through an opening and closing member (ball) and which rotates about the axis of the ball valve. The upper-mounted ball valve in the ball valve category is widely applied to petroleum and natural gas pipelines and devices for oil extraction, oil refining, petrochemical industry, chemical fiber, metallurgy, electric power, nuclear power, food, paper making and the like. The upper-mounted ball valve is simple and rapid to disassemble on a pipeline, and convenient and rapid to maintain. When the valve breaks down on the pipeline and needs to be repaired, the valve does not need to be disassembled from the pipeline, only the middle flange bolt and the nut need to be disassembled, the valve cover and the valve rod assembly are taken out of the valve body together, and then the ball body and the valve seat assembly are taken out. The ball and the valve seat can be repaired on line. This maintenance saves time and minimizes losses in production. The medium conveying pipeline has simple structure, convenient opening and closing and small flow resistance, and is widely applied to the medium conveying pipelines in the fields of petroleum, chemical industry, electric power and the like.

However, the existing top-loading ball valve still has friction between the ball body and the valve seat in the opening and closing process, and as the opening and closing times of the valve increase, the sealing surface is gradually abraded, the sealing performance is reduced, and the service life of the product is prolonged, so that improvement is needed.

Disclosure of Invention

The invention aims to provide a forced double-shutoff friction-free upper-mounted ball valve which realizes friction-free sealing between a ball body and a valve seat by using a sealing oil way system.

The technical purpose of the invention is realized by the following technical scheme: a forced double-shutoff friction-free top-mounted ball valve comprises a valve body, a valve cover, a front valve seat, a rear valve seat and a valve rod, wherein a valve cavity communicated with an inlet end and an outlet end is arranged in the valve body; vacuum oil chambers and retreat areas are arranged between the front valve seat and the valve body and between the rear valve seat and the valve body; when the driving device axially slides towards the direction close to the valve rod, hydraulic oil is filled in the vacuum oil chambers of the front valve seat and the rear valve seat, and the front valve seat and the rear valve seat are respectively abutted and sealed with the ball body;

when the driving device axially slides towards the direction far away from the valve rod, hydraulic oil is pumped out of the vacuum oil chamber, and under the pressure of a medium, the front valve seat and the rear valve seat move towards the retreat area, so that gaps exist between the front valve seat and the ball body.

The invention is further provided with: the oil way system is composed of an axial oil way, a radial oil way, a valve cover oil way, a valve body oil way and an oil injection valve, wherein the axial oil way is arranged on the axis of the valve rod, the radial oil way is arranged at the middle end position of the matching section of the valve rod and the valve cover, the valve cover oil way is arranged inside the two sides of the valve rod of the valve cover, the valve body oil way is arranged inside the valve body end connecting the valve cover, the front valve seat and the rear valve seat, and the oil outlet end of the oil injection valve is communicated with the valve body oil way.

The invention is further provided with: one end of the valve body oil way is communicated with the vacuum oil chamber, the other end of the valve body oil way is connected with the valve cover oil way, a gap is formed in the joint of the valve cover oil way and the valve body oil way, a first annular groove and a second annular groove are formed between the valve body and the valve cover respectively and are located on two sides of the gap respectively, and a first sealing ring and a second sealing ring are arranged on the first annular groove and the second annular groove.

The invention is further provided with: the valve cover oil way is connected with the radial oil way, the radial oil way is communicated with the axial oil way, a third annular groove and a fourth annular groove are arranged between the valve rod and the valve cover, the third annular groove and the fourth annular groove are respectively positioned at two sides of the radial oil way, and a third sealing ring and a fourth sealing ring are respectively arranged on the third annular groove and the fourth annular groove.

The invention is further provided with: the one end intercommunication that radial oil circuit was kept away from to axial oil circuit has the vacuum oil pocket, the vacuum oil pocket is enclosed to close by driving sleeve and valve rod and forms, the one end of driving sleeve orientation valve rod is provided with the groove of stepping down that can supply the valve rod embedding, be equipped with first keyway on the driving sleeve inboard, the second keyway with first keyway matched with is seted up to one side of valve rod, first keyway passes through the key-type connection with the second keyway, the length that first keyway was seted up is longer than the second keyway.

The invention is further provided with: the driving device comprises a support positioned on the upper end face of the valve cover, a transmission rod and a transmission sleeve which are coaxially arranged are arranged in the support, the transmission sleeve is sleeved outside the transmission rod and is in threaded fit with the transmission rod, one end of the transmission sleeve is in key connection with the valve rod, and a driving piece capable of driving the transmission rod to rotate is arranged at the top of the support;

the outer surface of the transmission sleeve is provided with an L-shaped groove, one side of the support is provided with a bolt which can be matched and clamped with the L-shaped groove in a penetrating way, the L-shaped groove comprises a first groove which is axially arranged along the transmission sleeve and a second groove which is circumferentially arranged along the transmission sleeve, and one end, facing the valve body, of the first groove is communicated with the second groove; when the valve is closed, one end of the bolt is matched and clamped with one end of the first groove, which is far away from the second groove.

In conclusion, the invention has the following beneficial effects: the application said force two turn-offs frictionless upper assembling type ball valve can realize the frictionless seal between spheroid and valve seat. Through the ingenious oil circuit system of design, the structure of disk seat and valve body fitting surface and the keyway length design on the drive sleeve, the action of oiling and oil pumping has been accomplished to the volume change of relying on the oil pocket, with the help of the effect of oiling and oil pumping, realized that oil pressure drive disk seat is opened and closing of disk seat is realized to medium pressure to adopt specific drive arrangement not only can drive the valve rod to carry out circumferential direction simultaneously, can also carry out relative axial displacement with the valve rod.

Drawings

FIG. 1 is a schematic structural view of a ball valve according to the first embodiment;

FIG. 2 is an enlarged schematic view of region A of FIG. 1;

FIG. 3 is an enlarged schematic view of region B in FIG. 1;

FIG. 4 is an enlarged schematic view of region C of FIG. 1;

FIG. 5 is a sectional view of the driving device of FIG. 1;

FIG. 6 is a schematic diagram of the structure of the transmission sleeve in FIG. 5 in a lifting state;

FIG. 7 is a schematic structural view of the transmission sleeve in FIG. 6 in a state of rotating 90 degrees;

fig. 8 is a schematic view of the drive rod and drive sleeve of fig. 7.

Reference numerals: 1. a valve body; 2. a valve cover; 3. a front valve seat; 4. a rear valve seat; 5. a valve stem; 6. an entrance end; 7. a discharge end; 8. a sphere; 9. a drive device; 10. a vacuum oil chamber; 11. a retirement area; 12. a valve seat sealing ring; 13. a dustproof and fireproof ring; 14. a void; 15. a first annular groove; 16. a second annular groove; 17. a third annular groove; 18. a fourth annular groove; 19. a vacuum oil cavity; 20. a transmission sleeve; 201. a first keyway; 202. a second keyway; 21. an oil seal ring; 22. a key; 23. a fifth annular groove; 24. a sixth annular groove; 25. a stepped fixing hole; 26. a limiting hole; 27. a fixed shaft; 28. a support; 29. a transmission rod; 30. a drive member; 31. an L-shaped groove; 32. a bolt; 33. a first groove; 34. a second groove; 35. a drive tooth; 36. fixing the step; 37. a first arc-shaped groove; 38. a through groove; 39. a guide sleeve; 40. a second arc-shaped groove; 41. a guide roller; 42. a drive nut; 43. a yielding groove; 121. an axial oil path; 122. a radial oil path; 123. a valve cover oil way; 124. a valve body oil passage; 125. and an oil filling valve.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1-8, a forced double-shut friction-free top-loading ball valve includes a valve body 1, a valve cover 2, a front valve seat 3, a rear valve seat 4 and a valve rod 5, wherein a valve cavity communicated with an inlet end 6 and an outlet end 7 is arranged inside the valve body 1, one end of the valve rod 5 in the valve cavity is provided with a ball 8, two sides of the ball 8 are respectively matched with the front valve seat 3 and the rear valve seat 4, one end of the valve rod 5 far away from the ball 8 is provided with a driving device 9, and the driving device 9 can drive the valve rod 5 to rotate in the circumferential direction or slide in the axial direction relative to the valve rod 5;

a vacuum oil chamber 10 and a retreat area 11 are arranged between the front valve seat 3, the rear valve seat 4 and the valve body 1. When the driving device 9 axially slides towards the direction close to the valve rod 5, hydraulic oil is filled in the vacuum oil chambers 10 of the front valve seat 3 and the rear valve seat 4, and at the moment, the front valve seat 3 and the rear valve seat 4 are respectively abutted and sealed with the ball 8; when the driving device 9 axially slides in a direction away from the valve rod 5, hydraulic oil is pumped out of the vacuum oil chamber 10, and under the pressure of a medium, the front valve seat 3 and the rear valve seat 4 move towards the receding area 11, so that a gap exists between the front valve seat and the ball 8.

In addition, the above-mentioned driving device can refer to the Chinese patent with application number 202010191698.5, which is previously applied by my self.

Further, a valve seat sealing ring 12 and a dustproof fireproof ring 13 are respectively arranged between the front valve seat 3 and the rear valve seat 4 and the valve body 1, and the valve seat sealing ring 12 and the dustproof fireproof ring 13 are respectively located at two ends of the vacuum oil chamber 10 to prevent a medium in the vacuum oil chamber 10 from leaking.

Further, the ball valve further comprises an oil path system communicated with the vacuum oil chamber 10, the oil path system is composed of an axial oil path 121, a radial oil path 122, a valve cover oil path 123, a valve body oil path 124 and an oil filling valve 125, the axial oil path 121 is arranged on the axis of the valve rod 5, the radial oil path 122 is arranged at the middle end position of the matching section of the valve rod 5 and the valve cover 2, the valve cover oil path 123 is arranged inside the two sides of the valve rod 5 of the valve cover 2, the valve body oil path 124 is arranged inside the end of the valve body 1 connecting the valve cover 2 with the front valve seat 3 and the rear valve seat 4, and the oil outlet end of the oil filling valve 125 is communicated with the valve body oil path 124.

Further, one end of a valve body oil path 124 is communicated with the vacuum oil chamber 10, the other end of the valve body oil path is connected with a valve cover oil path 123, a gap 14 is arranged at the joint of the valve cover oil path and the valve body oil path, a first annular groove 15 and a second annular groove 16 are respectively arranged between the valve body 1 and the valve cover 2, and the first annular groove 15 and the second annular groove 16 are respectively positioned on two sides of the gap 14. The first annular groove 15 and the second annular groove 16 are provided with a first seal ring (not shown) and a second seal ring (not shown).

Further, the bonnet oil path 123 is connected to the radial oil path 122, the radial oil path 122 is directly communicated with the axial oil path 121, a third annular groove 17 and a fourth annular groove 18 are disposed between the valve rod 5 and the bonnet 2, the third annular groove 17 and the fourth annular groove 18 are respectively located on two sides of the radial oil path 122, and a third seal ring (not shown in the drawings) and a fourth seal ring (not shown in the drawings) are mounted on the third annular groove 17 and the fourth annular groove 18. With the above arrangement, leakage of the medium in the radial oil passage 122 can be avoided.

Further, one end, far away from radial oil circuit 122, of axial oil circuit 121 is communicated with vacuum oil cavity 19, vacuum oil cavity 19 is enclosed by transmission sleeve 20 and valve rod 5 to form, one end, facing valve rod 5, of transmission sleeve 20 is provided with abdicating groove 43 for embedding of the valve rod, first key groove 201 is arranged on the inner side of transmission sleeve 20, second key groove 202 matched with first key groove 201 is arranged on one side of valve rod 5, first key groove 201 is connected with second key groove 202 through key 22, and the length that first key groove 201 is arranged is longer than second key groove 202.

Further, an evacuation valve (not shown) is provided at one side of the driving sleeve 20 to communicate with the vacuum oil chamber 19. When the oil filling valve 125 fills oil into the oil path system, the evacuation valve is opened until the evacuation valve leaks hydraulic oil, which indicates that the gas inside the oil path system is evacuated.

Further, an oil seal ring 21 capable of sealing both the valve rod 5 and the transmission sleeve 20 is disposed between the valve rod 5 and the transmission sleeve 20, and the number of the oil seal rings 21 is two, and the oil seal rings are a fifth oil seal ring 231 and a sixth oil seal ring 241 respectively. A fifth annular groove 23 and a sixth annular groove 24 are formed in the outer surface of the valve rod 5, and the fifth annular groove 23 and the sixth annular groove 24 are respectively matched with the fifth oil seal ring 231 and the sixth oil seal ring 241.

Further, the upper end of the sphere 8 is provided with a stepped fixing hole 25 matched with the valve rod 5, the stepped fixing hole 25 is riveted with one end of the valve rod 5, the lower end face of the sphere 8 is provided with a limiting hole 26, a fixing shaft 27 is arranged in the limiting hole 26, and one end of the fixing shaft 27 is fixedly connected with the valve body 1.

The application the upper assembling type ball valve can realize that no friction sealing exists between the ball body 8 and the front valve seat 3 and the rear valve seat 4. It should be noted that the driving device 9 of the present application not only can drive the driving sleeve 20 to rotate circumferentially, but also can drive the driving sleeve 20 to move axially. The valve rod 5 is connected with the transmission sleeve 20 through a key, and one end of the valve rod is riveted with the ball body 8, so that the transmission sleeve 20 drives the valve rod 5 to rotate in the circumferential rotation process, and the ball body 8 can be driven to rotate. The ball valve specifically operates as follows:

as shown in fig. 1 and 5, the ball valve is in a flow passage closed state, such that the inlet end 6 and the outlet end 7 of the valve body 1 are cut off by the ball 8, and at this time, the ball 8 is in sealing contact with the front valve seat 3 and the rear valve seat 4. At this time, the driving sleeve 20 is lowered to the lowest position, and the key 22 is located at the upper end of the first key groove 201.

If the flow passage needs to be opened, the ball 8 needs to be rotated to connect the inlet end 6 with the outlet end 7. In this application, the driving device 9 needs to drive the driving sleeve 20 to move up, and the key 21 is located at the lower end of the first key slot 201. The vacuum oil cavity 19 formed by the transmission sleeve 20 and the valve rod 5 is reserved with a vacuum area, at the moment, as the oil way system penetrates through the vacuum oil cavity 19 and the vacuum oil cavity 10, hydraulic oil filled in the vacuum oil cavity 10 can be sucked into the vacuum oil cavity 19 through the oil way system under the action of pressure difference, meanwhile, along with the suction of the hydraulic oil in the vacuum oil cavity 10, the vacuum area is gradually formed in the vacuum oil cavity 10, the end surfaces of the front valve seat 3 and the rear valve seat 4, which are close to the sphere 8, can be subjected to the action force of medium pressure, the action force of the medium pressure on the front valve seat 3 is along the direction opposite to the inlet end 6, the action force of the medium pressure on the rear valve seat 4 is along the direction of the outlet end 7, and under the action force of the medium pressure, the front valve seat 3 and the rear valve seat 4 are separated from the sphere 8.

Therefore, the front valve seat 3 and the rear valve seat 4 are separated from the sealing fit with the ball 8 through the movement, so that a gap exists between the front valve seat 3 and the rear valve seat 4, and part of the medium can be discharged from the gap from the inlet end 6 to the outlet end 7. Finally, the driving device 9 drives the transmission sleeve 20 to rotate, and the transmission sleeve 20 drives the valve rod 5 to rotate through the key 22, so as to rotate the ball 8 and open the flow passage. The movement of the ball 8 to effect the flow passage cut-off, in contrast to the above, is not described in detail here.

Further, the driving device 9 includes a bracket 28 located on the upper end surface of the valve cap 2, a transmission rod 29 coaxially disposed and a transmission sleeve 20 are disposed in the bracket 28, the transmission sleeve 20 is sleeved outside the transmission rod 29 and is in threaded fit with the transmission rod 29, and one end of the transmission sleeve 20 is connected with the valve rod 5 through a key 22. The top of the bracket 28 is provided with a driving member 30 which can drive the transmission rod 29 to rotate.

The outer surface of the transmission sleeve 20 is provided with an L-shaped groove 31, and one side of the bracket 28 is provided with a bolt 32 which can be matched and clamped with the L-shaped groove 31. The L-shaped groove 31 comprises a first groove 33 axially arranged along the transmission sleeve 20 and a second groove 34 circumferentially arranged along the transmission sleeve 20, and one end of the first groove 33 facing the valve body 1 is communicated with the second groove 34. When in a valve closing state, one end of the bolt 32 is matched and clamped with one end of the first groove 33 far away from the second groove 34.

The ball valve of the present application needs to be changed from a valve closing state to a valve opening state, and then the transmission sleeve 20 needs to be lifted to leave a vacuum area, so that hydraulic oil filled in the vacuum oil chamber 10 is sucked into the vacuum oil chamber 19 through the oil path system 11, the front valve seat 3 and the rear valve seat 4 are pushed to move towards a direction away from the ball body 8 by means of a medium pressure acting force, and then the ball valve rotates to realize frictionless opening and closing. The specific operation is as follows:

as shown in fig. 5-8, when the valve is in the closed state, one end of the bolt 32 is engaged with one end of the first groove 33 away from the second groove 34, that is, one end of the bolt 32 is in the position of (r) in fig. 6. The driving member 30 drives the transmission rod 29 to rotate, and the transmission sleeve 20 is synchronously driven to rotate due to the threaded fit between the transmission rod 29 and the transmission sleeve 20. However, since one end of the bolt 32 is now at the position of (r) in fig. 6, both ends of the bolt 32 are in contact with the groove wall of the first groove 33, and the rotation of the driving sleeve 20 is limited, so that the driving sleeve 20 can move only along the axial direction thereof. In the present application, the driving sleeve 20 will first perform a lifting movement, so that the driving sleeve 20 and the bolt 32 perform a relative movement, resulting in the bolt 32 being transformed from the position of (i) in fig. 6 to the position of (ii) in fig. 6. At this time, the lifting movement of the driving sleeve 20 can be completed to leave a vacuum area, so that the hydraulic oil filled in the vacuum oil chamber 10 is sucked into the vacuum oil chamber 19 through the oil path system 11, and the front valve seat 3 and the rear valve seat 4 are pushed to move away from the ball 8 by the medium pressure acting force.

Then, if the driving member 30 continues to drive the transmission rod 29 to rotate, at this time, one end of the bolt 32 does not abut against the wall of the first groove 33, so that the transmission sleeve 20 can rotate synchronously with the transmission rod 29, resulting in the bolt 32 being changed from the position of (ii) in fig. 6 to the position of (iii) in fig. 6. Because the driving sleeve 20 rotates, and then the synchronous driving valve rod 5 rotates, thereby completing the process of the rotation of the ball body 8, and realizing that the ball body 8 opens the flow passage without friction.

Further, the second groove 34 is an 1/4 peripheral ring groove formed along the circumferential direction of the driving sleeve 20. The opening of the second groove 34 is defined as 1/4 peripheral ring groove of the driving sleeve 20, so that the rotation of the driving sleeve 20 is limited to 90 degrees. When the transmission sleeve 20 rotates 90 degrees, the valve rod 5 can drive the ball 8 to synchronously rotate 90 degrees, so that the opening and closing of the flow passage by the ball 8 are completed, and the valve closing or opening action is completed.

Further, one side of the transmission rod 29 is provided with a driving tooth 35, and the upper end surface of the transmission sleeve 20 is integrally provided with a fixed step 36. When the driving rod 29 rotates 180 degrees to lift the driving sleeve 20, one side of the driving tooth 35 abuts against the fixed step 36.

First, the present application explicitly states: the displacement of the front valve seat 3 and the rear valve seat 4 moving away from the ball 8 is small (i.e. the space of the vacuum oil chamber 10), so that no friction exists between the ball 8 and the front valve seat 3 and the rear valve seat 4 in the opening and closing process. Therefore, in the present application, the rotation of the transmission rod 29 is limited to 180 degrees, and the bolt 32 is transformed from the position of (r) in fig. 6 to the position of (r) in fig. 6. The side of the drive tooth 35 which is just right now abuts against the fixed step 36. If the driving rod 29 is rotated further to drive the driving sleeve 20 to rotate synchronously, one side of the driving tooth 35 applies a synchronous rotating force to the fixed step 36, so that the driving sleeve 20 rotates, and the bolt 32 is changed from the position of (two) in fig. 6 to the position of (three) in fig. 6.

Specifically, the following are mentioned: due to the instant the ball 8 opens and closes in the valve chamber, the medium pressure exists against the ball 8, resulting in the ball 8 being difficult to rotate under the medium pressure. Therefore, to overcome this resistance, the present application is not only driven by the frictional resistance of the threaded engagement between the driving rod 29 and the driving sleeve 20, but also by the force of the driving teeth 35 against the fixed step 36 during the 90 degree rotation of the driving sleeve 20. Under the effect of the two external forces, the circumferential rotation of the transmission sleeve 20 is ensured to be stable and strong, and the stability of the system in the long-term use process is improved.

In the present application, the rotation range of the rotation rod 29 is 270 degrees, that is, 180 degrees of rotation drives the transmission sleeve 20 to move axially, and another 90 degrees of rotation drives the transmission sleeve 20, the valve rod 5 and the ball 8 to rotate 90 degrees to open and close the flow channel. Through a small rotation range, the abrasion-free opening and closing flow channel between the ball 8 and the front valve seat 3 and between the ball and the rear valve seat 4 can be realized.

Furthermore, one side of the transmission rod 29 is provided with a first arc-shaped groove 37, one side of the transmission sleeve 20 is provided with a through groove 38 matched with the first arc-shaped groove 37 in a penetrating manner, the inner wall of the bracket 28 is provided with a guide sleeve 39, and one side of the guide sleeve 39 facing the transmission sleeve 20 is provided with a second arc-shaped groove 40. When one end of the bolt 32 is engaged with the second groove 34, the first arc-shaped groove 37 is flush with the through groove 38 and communicates with the second arc-shaped groove 40 through the through groove 38. The through groove 38 is provided with a guide roller 41 for limiting the driving sleeve 20, and one side of the guide roller 41 can be matched with the first arc-shaped groove 37 or the second arc-shaped groove 40.

When the ball valve is in a valve closing state (flow passage closing state), the wire roller 41 is engaged with the through groove 35 and the second arc-shaped groove 40; when the ball valve is in the valve-open state (flow passage-open state), the guide roller 41 is fitted to the through groove 38 and the first arc-shaped groove 37.

Since the driving sleeve 20 of the present application is required to bear not only its own weight but also the weight of the attached valve stem 5. The valve rod 5 is not only a moving part and a stressed part but also a sealing part in the opening and closing process of the valve, and simultaneously, the valve rod is also impacted and corroded by a medium and generates friction with a packing. Therefore, copper alloy, carbon steel, stainless steel, etc. are often used as the material of the valve rod 5, and these materials may increase the weight of the valve rod 5 itself. In the above-described solution, the valve stem 5 and the transmission sleeve 20 are engaged with the transmission rod 29 only by a screw connection, and the weight of the transmission sleeve 20 and the valve stem 5 is supported by the screw engagement. In the long-term use process, the use hidden danger exists, and the thread matching area of the transmission sleeve 20 and the transmission rod 29 can influence the support of the weight of the transmission sleeve.

In the present application, the above problem is solved by the guide roller 41. The specific operation is as follows: when the ball valve is in the closed state, the guide roller 41 is located at the position where the through groove 38 and the second arc-shaped groove 40 are matched. At this time, the guide sleeve 39 supports the guide roller 41, and the drive sleeve 20 is further supported by the guide roller 41, so that the weight of the drive sleeve 20 and the valve stem 5 is shared, and the stability of the system operation is improved.

When the valve opening operation is required, the driving sleeve 20 is lifted axially, and then the valve rod 5 is rotated. After the axial lifting of the driving sleeve 20 has taken place, the change of the bolt 32 from the position shown in fig. 6 to the position shown in fig. 6 can be completed. The through slot 38 is flush with the second arc-shaped groove 40, and if the transmission rod 29 is further rotated to drive the transmission sleeve 20 to rotate synchronously, the transmission sleeve 20 and the guide sleeve 39 will rotate relatively. The second arc-shaped groove 40 on the guide sleeve 39, which is matched with the guide roller 41, has a guiding function, so that the guide roller 41 is separated from the second arc-shaped groove 40 along with the rotation of the transmission sleeve 20, the guide roller 41 is further moved to a position between the through groove 38 and the first arc-shaped groove 37, the sphere 8 is completely opened until the rotation is 90 degrees, and the bolt 32 is changed from the position (II) in the graph 6 to the position (III) in the graph 6. The guide roller 41 now secures the drive sleeve 20 to the drive rod 29.

The above-mentioned process is a complete valve opening process, and the valve closing process is opposite to the above-mentioned motion process, and is not described in detail herein.

Further, a transmission nut 42 is arranged between the transmission rod 29 and the transmission sleeve 20, one side of the transmission nut 42 is fixedly connected with the transmission sleeve 20, and the other side of the transmission nut 42 is in threaded connection with the transmission rod 29.

The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a force two shutoff frictionless upper assembling type ball valve, includes valve body (1), valve gap (2), preceding disk seat (3), back disk seat (4) and valve rod (5), valve body (1) inside is provided with the valve pocket that is linked together with entering end (6) and discharge end (7), valve rod (5) one end in the valve pocket is provided with spheroid (8), the both sides of spheroid (8) cooperate its characterized in that with preceding disk seat (3), back disk seat (4) respectively: a driving device (9) is arranged at one end, far away from the sphere (8), of the valve rod (5), and the driving device (9) can drive the valve rod (5) to rotate in the circumferential direction or slide axially relative to the valve rod (5); a vacuum oil chamber (10) and a retreat area (11) are arranged between the front valve seat (3), the rear valve seat (4) and the valve body (1);

when the driving device (9) axially slides towards the direction close to the valve rod (5), hydraulic oil is filled in the vacuum oil chambers (10) of the front valve seat (3) and the rear valve seat (4), and the front valve seat (3) and the rear valve seat (4) are respectively abutted and sealed with the ball body (8); when the driving device (9) axially slides towards the direction far away from the valve rod (5), hydraulic oil is pumped out of the vacuum oil chamber (10), and under the pressure of a medium, the front valve seat (3) and the rear valve seat (4) move towards the retreat area (11) so that gaps exist between the front valve seat and the ball body (8);

the driving device (9) comprises a support (28) positioned on the upper end face of the valve cover (2), a transmission rod (29) and a transmission sleeve (20) which are coaxially arranged are arranged in the support (28), the transmission sleeve (20) is sleeved outside the transmission rod (29) and is in threaded fit with the transmission rod (29), one end of the transmission sleeve (20) is connected with the valve rod (5) through a key (22), and a driving piece (30) capable of driving the transmission rod (29) to rotate is arranged at the top of the support (28); the outer surface of the transmission sleeve (20) is provided with an L-shaped groove (31), one side of the support (28) is provided with a bolt (32) which can be matched and clamped with the L-shaped groove (31) in a penetrating mode, the L-shaped groove (31) comprises a first groove (33) which is axially arranged along the transmission sleeve (20) and a second groove (34) which is circumferentially arranged along the transmission sleeve (20), and one end, facing the valve body (1), of the first groove (33) is communicated with the second groove (34); when being in the shut valve state, the one end cooperation joint of second recess (34) is kept away from with first recess (33) to the one end of bolt (32), be equipped with first keyway (201) on driving sleeve (20) inboard, second keyway (202) with first keyway (201) matched with are seted up to one side of valve rod (5), first keyway (201) are connected through key (22) with second keyway (202), the length that first keyway (201) were seted up is longer than second keyway (202).

2. A forced double shut-off frictionless top-loading ball valve according to claim 1, wherein: still including the oil piping system who is linked together with vacuum oil chamber (10), oil piping system comprises axial oil circuit (121), radial oil circuit (122), valve gap oil circuit (123), valve body oil circuit (124), oiling valve (125), set up on valve rod (5) axis axial oil circuit (121), set up in the middle-end position of valve rod (5) and valve gap (2) cooperation section radial oil circuit (122), set up in the inside of valve gap (2) in valve rod (5) both sides in valve rod (123), set up in valve body (1) end inside of connecting valve gap (2) and preceding disk seat (3), back disk seat (4) valve body oil circuit (124), the oil output end and valve body oil circuit (124) of oiling valve (125) are linked together.

3. A forced double shut-off frictionless top-loading ball valve according to claim 2, wherein: one end of the valve body oil way (124) is communicated with the vacuum oil chamber (10), the other end of the valve body oil way is connected with the valve cover oil way (123), a gap (14) is formed in the joint of the valve cover oil way (123) and the valve body oil way (124), a first annular groove (15) and a second annular groove (16) are respectively formed between the valve body (1) and the valve cover (2), the first annular groove (15) and the second annular groove (16) are respectively located on two sides of the gap (14), and a first sealing ring and a second sealing ring are arranged on the first annular groove (15) and the second annular groove (16).

4. A forced double shut-off frictionless top-loading ball valve according to claim 3, wherein: the valve cover oil way (123) is connected with the radial oil way (122), the radial oil way (122) is communicated with the axial oil way (121), a third annular groove (17) and a fourth annular groove (18) are arranged between the valve rod (5) and the valve cover (2), the third annular groove (17) and the fourth annular groove (18) are respectively positioned on two sides of the radial oil way (122), and a third sealing ring and a fourth sealing ring are respectively arranged on the third annular groove (17) and the fourth annular groove (18).

5. A forced double shut-off frictionless top-loading ball valve according to claim 4, wherein: one end of the axial oil path (121) far away from the radial oil path (122) is communicated with a vacuum oil chamber (19), the vacuum oil chamber (19) is formed by enclosing a transmission sleeve (20) and a valve rod (5), and one end, facing the valve rod (5), of the transmission sleeve (20) is provided with a yielding groove (43) for embedding the valve rod (5).