CN212928822U

CN212928822U - Cock pre-tightening adjusting structure of large-diameter oil seal type plug valve

Info

Publication number: CN212928822U
Application number: CN202021488367.XU
Authority: CN
Inventors: 朱兵
Original assignee: Gaiyide Wuxi Valve Co ltd
Current assignee: Gaiyide Wuxi Valve Co ltd
Priority date: 2020-07-24
Filing date: 2020-07-24
Publication date: 2021-04-09
Anticipated expiration: 2030-07-24

Abstract

The utility model discloses a plug pre-tightening adjustment structure of a large-diameter oil-sealed plug valve, which comprises a valve body and a valve stem, the valve stem is installed inside the upper end of the valve body, and the outer wall of the lower end of the valve body is provided with a valve cover , the valve cover and the valve body are fixedly connected by fastening bolts, the inside of the valve cover has an adjusting rod, and the upper end of the adjusting rod is connected with a cock, and is added between the upper support shaft and the lower support shaft. Thrust roller bearing enables the lower support shaft to remain in a constant state relative to the valve cover when the valve stem is rotated to open the valve, and will not rotate with the rotation of the upper support shaft, so that the valve cover and the valve core face the inner wall The upper sealing disc between the two will not be damaged by twisting, preventing the valve from leaking, and at the same time, due to the small friction force generated by the thrust roller bearing, the valve torque will also be reduced, so that the valve can be opened or closed when the valve stem is rotated. The process is more convenient and labor-saving.

Description

Cock pre-tightening adjusting structure of large-diameter oil seal type plug valve

Technical Field

The utility model belongs to the technical field of petrochemical plug valve is relevant, concretely relates to cock pretension of heavy-calibre oil blanket formula plug valve is adjusted structure.

Background

The plug valve is a fast-switching straight-through valve, which can be used for medium with suspended particles because the movement between rotary sealing surfaces has a wiping action and can completely prevent the contact with flowing medium when the valve is fully opened. Another important feature of the plug valve is that it is easily adaptable to a multi-channel configuration so that two, three, or even four different flow paths can be achieved for one valve. This simplifies the piping design, reduces the amount of valves and the number of connection fittings required in the device. The plug valve is widely applied to oil field exploitation, transportation and refining equipment, and is also widely applied to petrochemical industry, chemical industry, coal gas, natural gas, liquefied petroleum gas, heating and ventilation industry and general industry.

The prior oil seal type plug valve technology has the following problems: most oil seal formula plug valve at present, the body lid is sealed to adopt the thin metal disc to seal, cock adjustment mechanism is realized with adjusting the pole by last back shaft and lower, it is direct with the face contact to go up the back shaft, nevertheless to heavy-calibre plug valve, the weight of cock is very big, the pretightning force that needs the ejector pin to provide is also corresponding very big, because last back shaft is with the face contact, last back shaft all probably rotates about during the valve switch, because the pretightning force is huge, the moment of torsion that causes the valve is very big, simultaneously the frictional force of back shaft and last sealed dish down also can be very big, can cause the sealed dish of going up to break after the switch valve many.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a structure is adjusted in cock pretension of heavy-calibre oil blanket formula plug valve to easily cause the sealed dish problem of breaking when solving the most oil blanket formula heavy-calibre plug valve switch that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: a cock pre-tightening adjusting structure of a large-diameter oil seal type plug valve comprises a valve body and a valve rod, wherein the valve rod is arranged inside the upper end of the valve body, the valve cover is arranged on the outer wall of the lower end of the valve body and is fixedly connected with the valve body through a fastening bolt, an adjusting rod penetrates through the valve cover, a cock is connected to the upper end of the adjusting rod, a top block is arranged in the cock at the upper end of the adjusting rod, a lower sealing disc is arranged on the inner wall of the cock at the upper side of the top block, an upper sealing disc is arranged on the inner wall of the cock at the upper side of the lower sealing disc, a lower support shaft is arranged in the cock on the upper side of the upper sealing disc, a first O-shaped ring is sleeved outside the upper end of the lower support shaft, the novel bearing support device is characterized in that an upper support shaft is arranged inside a cock on the upper side of the lower support shaft, a second O-shaped ring is sleeved outside the upper support shaft, and a thrust roller bearing is arranged between the upper support shaft and the opposite inner wall of the lower support shaft.

Preferably, the left end of the valve body is provided with a left connecting flange, and the right end of the valve body is provided with a right connecting flange.

Preferably, the lower end of the valve rod in the valve body is connected with a valve core, and the upper end of the cock vertically penetrates through the valve cover and extends into the inner wall of the lower end of the valve core.

Preferably, the thrust roller bearing is vertically aligned with the circle centers of the upper support shaft and the lower support shaft on the upper side and the lower side.

Preferably, the circumference outer walls of the upper supporting shaft and the lower supporting shaft are respectively provided with an annular groove, and the second O-shaped ring and the first O-shaped ring are respectively clamped in the annular grooves in the outer walls of the upper supporting shaft and the lower supporting shaft.

Compared with the prior oil seal type plug valve technology, the utility model provides a structure is adjusted in cock pretension of heavy-calibre oil seal type plug valve possesses following beneficial effect:

1. the utility model discloses an add thrust roller bearing between last back shaft and lower back shaft, make in the process of making the valve open at the rotating valve rod, the lower back shaft can keep the constant state for the valve gap, can not rotate along with the rotation of last back shaft, thereby make the last sealed dish between valve gap and the case subtend inner wall not damaged because of the distortion effect, prevent that the valve from revealing, simultaneously because the frictional force that thrust roller bearing produced is less, make the valve moment of torsion also can reduce, thereby make the valve open or the in-process of closing more convenient, laborsaving at the rotating valve rod;

2. the utility model discloses a set up a second O type circle and first O type circle respectively with the under bracing axle at last back shaft, thereby play sealed effect well, make the valve open the in-process rotating the valve rod, the medium in the valve of flowing through can not trickle out from the gap of last back shaft with the under bracing axle, thereby make thrust roller bearing can not contact the medium in the valve of flowing through, thrust roller bearing can not corrode, play better guard action to thrust roller bearing, can prolong thrust roller bearing's life greatly, avoid frequent maintenance to change, and the maintenance cost is reduced.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description, do not constitute a limitation of the invention, in which:

fig. 1 is a schematic diagram of a cock pre-tightening adjustment structure of a large-diameter oil seal type plug valve provided by the utility model;

FIG. 2 is a schematic view of the faucet structure of the present invention;

in the figure: 1. a valve body; 2. a cock; 3. a valve cover; 4. fastening a bolt; 5. a right connecting flange; 6. a valve stem; 7. a left attachment flange; 8. adjusting a rod; 9. a top block; 10. a first O-ring; 11. a thrust roller bearing; 12. a second O-ring; 13. an upper support shaft; 14. a lower support shaft; 15. an upper sealing disc; 16. the lower sealing disk.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, the present invention provides a technical solution: a cock pre-tightening adjusting structure of a large-diameter oil seal type plug valve comprises a valve body 1 and a valve rod 6, wherein the valve rod 6 is installed inside the upper end of the valve body 1, the lower end of the valve rod 6 inside the valve body 1 is connected with a valve core, the upper end of a cock 2 vertically penetrates through a valve cover 3 and extends into the inner wall of the lower end of the valve core, the valve body 1 is sealed through the cock 2, the valve body 1 can be subjected to valve leakage, maintenance and checking and the like by opening the valve cover 3, when the valve rod 6 is normally rotated to open the valve, the cock 2 at the lower end can be fixed at the position of an axis, so that the regulation and control of the flow of the valve body 1 by the valve core are not influenced, the valve cover 3 is arranged on the outer wall of the lower end of the valve body 1, the valve cover 3 is fixedly connected with the valve body 1 through a fastening, a lower sealing disc 16 is arranged on the inner wall of the cock 2 on the upper side of the top block 9, an upper sealing disc 15 is arranged on the inner wall of the cock 2 on the upper side of the lower sealing disc 16, a lower support shaft 14 is arranged inside the cock 2 on the upper side of the upper sealing disc 15, a first O-shaped ring 10 is sleeved outside the upper end of the lower support shaft 14, an upper support shaft 13 is arranged inside the cock 2 on the upper side of the lower support shaft 14, a second O-shaped ring 12 is sleeved outside the upper support shaft 13 and the lower support shaft 14, annular grooves are respectively arranged on the circumferential outer walls of the upper support shaft 13 and the lower support shaft 14, the second O-shaped ring 12 and the first O-shaped ring 10 are respectively clamped in the annular grooves on the outer walls of the upper support shaft 13 and the lower support shaft 14, the second O-shaped ring 12 and the first O-shaped ring 10 are sleeved outside the upper support shaft 13 and the lower support shaft, the thrust roller bearing 11 is well protected.

The utility model provides a big-bore oil blanket formula plug valve's cock pretension adjusts structure, be provided with thrust roller bearing 11 between the subtend inner wall of last supporting axle 13 and lower back shaft 14, thrust roller bearing 11 and the vertical at a straight line in the centre of a circle of last supporting axle 13 and lower back shaft 14 of upper and lower both sides, through increase thrust roller bearing 11 between last supporting axle 13 and lower back shaft 14, make at normal rotation valve rod 6 messenger valve opening in-process, lower back shaft 14 can keep the constant state, can not rotate along with it, thereby make the last sealed dish 15 between valve gap 3 and the case subtend inner wall can not damage because of the distortion, simultaneously because the produced frictional force of thrust roller bearing 11 is less, make the valve moment of torsion also can reduce, it is more laborsaving during messenger's switch valve.

The utility model provides a big-bore oil blanket formula plug valve's cock pretension adjusts structure, is provided with left flange 7 including the left end of valve body 1, and the right-hand member of valve body 1 is provided with right flange 5, and left flange 7 is linked together with external pipeline respectively with right flange 5 to constitute valve access structure, can accomplish the accurate control to flowing liquid through the circulation of valve rod 6 control valve body 1.

The utility model discloses a theory of operation and use flow: after the utility model is installed, the valve core of the novel plug valve utilizes the valve core with a through hole as the valve of the opening and closing piece, the valve core rotates along with the valve rod 6 to realize the opening and closing action, the valve core of the novel plug valve is a cone and forms a sealing pair by matching with the conical hole surface of the valve body 1, the lower support shaft 14 can keep a constant state and can not rotate along with the cone when the valve rod 6 is rotated to open the valve, so that the upper sealing disc 15 between the valve cover 3 and the opposite inner wall of the valve core can not be damaged due to the distortion effect, simultaneously, the valve torque can be reduced because the friction force generated by the thrust roller bearing 11 is smaller, and the second O-shaped ring 12 and the first O-shaped ring 10 are respectively sleeved on the upper support shaft 13 and the lower support shaft 14, thereby the good sealing effect is achieved, the thrust roller bearing 11 can not contact the medium flowing through the valve, thereby, the thrust roller bearing 11 is well protected.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A plug pre-tightening adjustment structure for a large-diameter oil-sealed plug valve, comprising a valve body (1) and a valve stem (6), characterized in that the valve stem (6) is installed on the upper end of the valve body (1) Inside, a valve cover (3) is provided on the outer wall of the lower end of the valve body (1), and the valve cover (3) and the valve body (1) are fixedly connected by fastening bolts (4). An adjustment rod (8) runs through the inside of (3), a cock (2) is connected to the upper end of the adjustment rod (8), and a top block (9) is provided inside the cock (2) at the upper end of the adjustment rod (8). , a lower sealing disc (16) is arranged on the inner wall of the cock (2) on the upper side of the top block (9), and an upper sealing disc (15) is arranged on the inner wall of the cock (2) on the upper side of the lower sealing disc (16). ), the cock (2) on the upper side of the upper sealing disc (15) is internally provided with a lower support shaft (14), and the upper end of the lower support shaft (14) is sleeved with a first O-ring (10), An upper support shaft (13) is arranged inside the cock (2) on the upper side of the lower support shaft (14), and a second O-ring (12) is sleeved on the outside of the upper support shaft (13). A thrust roller bearing (11) is arranged between the support shaft (13) and the facing inner wall of the lower support shaft (14).

2. The plug pre-tightening adjustment structure of a large-diameter oil-sealed plug valve according to claim 1, characterized in that: the left end of the valve body (1) is provided with a left connecting flange (7), and the valve body (1) is provided with a left connecting flange (7). The right end of the body (1) is provided with a right connecting flange (5).

3. The cock pre-tightening adjustment structure of a large-diameter oil-sealed cock valve according to claim 1, characterized in that: the lower end of the valve stem (6) inside the valve body (1) is connected with a valve core, the The upper end of the cock (2) vertically passes through the valve cover (3) and protrudes into the inner wall of the lower end of the valve core.

4. A cock pre-tightening adjustment structure for a large-diameter oil-sealed cock valve according to claim 1, characterized in that: the thrust roller bearing (11) and the upper support shaft (13) on the upper and lower sides and the lower The center of the support shaft (14) is vertically on a straight line.

5. A cock pre-tightening adjustment structure for a large-diameter oil-sealed cock valve according to claim 1, characterized in that: the outer circumferential walls of the upper support shaft (13) and the lower support shaft (14) are respectively provided with An annular groove, the second O-ring (12) and the first O-ring (10) are respectively clamped in the annular grooves on the outer walls of the upper support shaft (13) and the lower support shaft (14).