CN211852998U - Plugging device for replacing valve - Google Patents

Abstract

The utility model discloses a change valve plugging device belongs to oil well exploration equipment technical field. The inner wall of the force transmission sleeve is in threaded fit with the outer wall of the central shaft. The outer sleeve is sleeved on the force transmission sleeve. The valve connecting sleeve is positioned between the outer sleeve and the force transmission sleeve. When the valve is disassembled, the valve connecting sleeve is connected with the valve, the outer sleeve is rotated to enable the outer sleeve to move towards the direction close to the tensioning structure, the outer sleeve can push the force transmission sleeve and the central shaft to enter a pipeline connected with the valve, the central shaft returns, the elastic sealing cylinder and the split type slips on the central shaft are pressed on the end face of the force transmission sleeve by the cylindrical protrusion at one end of the central shaft, the elastic sealing cylinder and the split type slips are tensioned and sealed and clamp the pipeline, and the integral sealing effect is good and the operation is simple. And (3) removing the valve, the valve connecting sleeve and the outer sleeve from the force transmission sleeve to finish the removal of the valve, and installing a new valve and removing the plugging device according to the reverse flow of the operation. The whole operation is simpler and the time required for valve replacement is less.

Description

Plugging device for replacing valve

Technical Field

The utility model relates to an oil well exploration equipment technical field, in particular to change valve plugging device.

Background

The production tree is an oil-water wellhead control device used in oil and gas testing after completion of an oil-gas well or oil production of a self-injection oil-water well, a mechanical oil-water well and the like. The christmas tree comprises a tubing hanger and a number of valves. If the valve is damaged and lost, the valve needs to be replaced to ensure the normal work of the Christmas tree.

In the related art, when the valve on the Christmas tree is replaced, the valve can be opened to release the pressure in the oil-water well where the Christmas tree is located so as to facilitate the replacement of the valve on the Christmas tree; or pumping the oil-water well repairing liquid into the oil-water well or the stratum by using a pump truck to offset the internal pressure of the oil-water well until no pressure exists at the oil-water well mouth where the Christmas tree is located, and then replacing the valve on the Christmas tree.

When the methods are used for replacing the valves on the Christmas tree, long preparation time is needed and safety preparation is well done, so that the time and operation needed for replacing the whole valves are increased, and the production efficiency of the oil-water well is influenced.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a plugging device for replacing a valve, which can reduce the time required by replacing the valve, simplify the operation required by replacing the valve and improve the production efficiency of an oil-water well. The technical scheme is as follows:

the disclosed embodiment provides a plug for replacing a valve, which comprises a central shaft, a pushing structure and a tensioning structure, wherein a cylindrical bulge is coaxially connected to a first end of the central shaft, the diameter of the cylindrical bulge is larger than that of the central shaft, chamfers are arranged between the side wall of the cylindrical bulge and two end faces of the cylindrical bulge,

the pushing structure is arranged close to the second end of the center shaft and comprises a force transmission sleeve, an outer sleeve and a valve connecting sleeve, the inner wall of the force transmission sleeve is in threaded fit with the outer wall of the center shaft, the outer sleeve is coaxially sleeved on the force transmission sleeve, one end of the outer sleeve, which is close to the tensioning structure, is coaxially provided with a circular groove, the bottom surface of the circular groove is abutted against the end surface of one end of the force transmission sleeve, the valve connecting sleeve is coaxially sleeved on the force transmission sleeve, the two ends of the force transmission sleeve extend out of the valve connecting sleeve, the outer wall of the valve connecting sleeve is in threaded fit with the side wall of the circular groove, one end of the valve connecting sleeve, which is close to the tensioning structure, extends out of the circular groove, and the pushing structure further comprises a fixing structure which is used for connecting and separating the force transmission sleeve and,

the tensioning structure is close to the first end of the central shaft is arranged, the tensioning structure comprises an elastic sealing cylinder and a split type slip, the elastic sealing cylinder and the split type slip are coaxially sleeved on the central shaft, one end of the elastic sealing cylinder is abutted to the end face of the force transmission sleeve, the other end of the elastic sealing cylinder is abutted to the first end of the split type slip, and the second end of the split type slip is close to the cylindrical bulge to abut to the chamfer of the tensioning structure.

Optionally, the valve-replacing stopper further comprises an installation cylinder, the installation cylinder is sleeved on the central shaft, and the installation cylinder is located between the central shaft and the elastic sealing cylinder.

Optionally, an annular groove is coaxially formed in the outer wall of the mounting cylinder, and the elastic sealing cylinder is located in the annular groove.

Optionally, the tensioning structure further comprises an annular fixed plate and a fixed ring, the annular fixed plate is sleeved on the installation cylinder and located in the annular groove, one end of the annular fixed plate is abutted to the end face of the force transmission sleeve, the other end of the annular fixed plate is abutted to the elastic sealing cylinder, the inner wall of the fixed ring is in threaded fit with the outer wall of the force transmission sleeve, and the fixed ring is far away from one end of the force transmission sleeve and is tightly pressed against the annular fixed plate.

Optionally, the tensioning structure further comprises a compression ring, the compression ring is coaxially sleeved on the annular fixing plate, one side of the compression ring abuts against the end face of the fixing ring, the other side of the compression ring abuts against the elastic sealing cylinder, and the compression ring compresses the elastic sealing cylinder.

Optionally, the tensioning structure further comprises an annular base plate, the annular base plate is coaxially sleeved on the central shaft, one end of the annular base plate abuts against one end of the force transmission sleeve, and the other end of the annular base plate abuts against one end of the mounting cylinder and one end of the annular fixing plate.

Optionally, the first end of split type slips is coaxial to be provided with the propelling ring, coaxial annular arch that is provided with on the inner wall of propelling ring, annular arch is located between two terminal surfaces of propelling ring, annular arch is kept away from the bellied terminal surface of cylinder with the elastic sealing section of thick bamboo offsets.

Optionally, the split slip comprises a plurality of arc plates, the arc plates are arranged along the circumference of the central shaft at equal intervals, each outer wall of each arc plate is provided with a plurality of coaxial conical clamping plates, and the diameter of the outer wall of each conical clamping plate is gradually reduced from the tensioning structure to the direction of the cylindrical protrusion.

Optionally, an included angle between a generatrix of the cylindrical protrusion, which is close to the chamfer of the tensioning structure, and the axis of the central shaft is α, and 0 ° < α ≦ 40 °.

Optionally, the fixed knot constructs including annular plate and set screw, annular plate coaxial coupling in pass power sleeve is kept away from one of tight structure is served, the external diameter of annular plate is less than pass power sleeve's external diameter, set screw threaded connection in on the outer sleeve, it has the correspondence to open on the annular plate the screw hole of set screw.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects: the tensioning structure is arranged close to the first end of the central shaft, the pushing structure is arranged close to the second end of the central shaft, and the inner wall of the force transmission sleeve in the pushing structure is in threaded fit with the outer wall of the central shaft. The outer sleeve is sleeved on the force transmission sleeve, a circular groove is coaxially formed in one end, close to the tensioning structure, of the outer sleeve, and the bottom surface of the circular groove abuts against the end face of the force transmission sleeve. The valve connecting sleeve is coaxially sleeved on the force transmission sleeve, two ends of the force transmission sleeve extend out of the valve connecting sleeve, one end, close to the tensioning structure, of the valve connecting sleeve extends out of the circular groove, the valve connecting sleeve is located between the force transmission sleeve and the outer sleeve, the outer sleeve cannot cover the valve connecting sleeve, and the valve connecting sleeve cannot cover the force transmission sleeve. When the valve needs to be disassembled, the valve is closed firstly, one end of the valve connecting sleeve, which extends out of the force transmission sleeve, is connected with the valve, the outer sleeve is rotated to enable the outer sleeve to move axially towards the direction close to the tensioning structure, the bottom surface of the circular groove in the outer sleeve is abutted to the end surface of the force transmission outer sleeve, the outer sleeve pushes the end surface of the force transmission sleeve through the bottom surface of the circular groove to enable the force transmission sleeve to move axially, and the force transmission sleeve and the center shaft in threaded connection with the force transmission sleeve move axially together, so that the center shaft can extend into the valve until the. The valve is opened, the outer sleeve is rotated to enable the central shaft to extend into a pipeline connected with the valve, the force transmission sleeve and the outer sleeve are connected through the fixing structure, the central shaft in threaded connection with the force transmission sleeve is rotated to enable the central shaft to retract in the axial direction, the force transmission sleeve in threaded fit with the central shaft is limited by the outer sleeve and the bottom surfaces of the circular grooves of the outer sleeve in the axial direction and the circumferential direction, the outer sleeve is limited by the valve connecting sleeve and the valve to be replaced in the axial direction and the circumferential direction, and the force transmission sleeve cannot move. When the center pin rolls back in the axial, because the equal coaxial cover of the elastic sealing section of thick bamboo in the tight structure that rises and split type slips is on the center pin, and elastic sealing section of thick bamboo one end offsets with the terminal surface that stretches out telescopic one end of biography power of valve connecting sleeve, the other end of elastic sealing section of thick bamboo offsets with the first end of split type slips, the second end of split type slips offsets with the bellied chamfer of cylinder that the diameter is greater than the center pin diameter and is located the first end of center pin, elastic sealing section of thick bamboo and split type slips can be compressed tightly on biography telescopic terminal surface by the cylinder arch, elastic sealing section of thick bamboo receives axial compression and radial tight pipeline that rises, realize sealed to the pipeline, split type slips can be propped open by the bellied chamfer of cylinder and radial expansion card is on the pipeline. The split type slip can limit the position of the elastic sealing cylinder after the elastic sealing cylinder is tensioned, and the phenomenon that oil overflows due to shaking of the elastic sealing cylinder is avoided. The whole sealing effect is good and the operation is simple. And finally, the valve connecting sleeve and the outer sleeve are detached from the force transmission sleeve together to finish the detachment of the valve, and then a new valve is installed and the plugging device is detached by adopting the reverse flow of the operation. The whole operation is simpler and the time required for valve replacement is less.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings used in the description of the embodiments will be briefly introduced,

fig. 1 is a schematic structural diagram of a replacement valve stopper provided in an embodiment of the present disclosure;

FIG. 2 is a schematic diagram of one configuration of a split slip provided by an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a central shaft and a cylindrical protrusion provided in an embodiment of the present disclosure;

fig. 4 is a schematic view of a tensioning structure provided in the embodiments of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a replacement valve stopper provided in an embodiment of the present disclosure. As shown in fig. 1, the replacement valve stopper includes a central shaft 1, a pushing structure 2 and a tensioning structure 3. The other end coaxial coupling of center pin 1 has a cylinder arch 11, and the diameter of cylinder arch 11 is greater than the diameter of center pin 1, the protruding lateral wall of cylinder 11 with all be provided with chamfer 12 between two terminal surfaces of cylinder arch 11.

The push structure is arranged near the second end of the central shaft 1 and the push structure 2 comprises a force transmission sleeve 21, an outer sleeve 22 and a valve connection sleeve 23. The inner wall of the force transmission sleeve 21 is in threaded fit with the outer wall of the central shaft 1, the outer sleeve 22 is coaxially sleeved on the force transmission sleeve 21, one end, close to the tensioning structure 3, of the outer sleeve 22 is coaxially provided with a circular groove 221, the bottom surface of the circular groove 221 is abutted to the end face of one end of the force transmission sleeve 21, the valve connecting sleeve 23 is coaxially sleeved on the force transmission sleeve 21, two ends of the force transmission sleeve 21 extend out of the valve connecting sleeve 23, the outer wall of the valve connecting sleeve 23 is in threaded fit with the side wall of the circular groove 221, and one end, close to the tensioning structure 3, of the valve connecting sleeve 23 extends out. The pushing structure 2 further comprises a fixing structure 24 for connecting and disconnecting the force transmission sleeve 21 and the outer sleeve 22.

The tensioning structure is arranged close to the first end of the central shaft 1, and the tensioning structure 3 comprises an elastic sealing cylinder 31 and a split slip 32. The elastic sealing cylinder 31 and the split type slip 32 are coaxially sleeved on the central shaft 1, one end of the elastic sealing cylinder 31 abuts against the end face of the force transmission sleeve 21, the other end of the elastic sealing cylinder 31 abuts against the first end of the split type slip 32, and the second end of the split type slip 32 abuts against the chamfer 12 of the cylindrical protrusion 11 close to the tensioning structure 3.

The tensioning structure 3 is arranged close to the first end of the central shaft 1, the pushing structure 2 is arranged close to the second end of the central shaft 1, and the inner wall of the force transmission sleeve 21 in the pushing structure 2 is in threaded fit with the outer wall of the central shaft 1. The outer sleeve 22 is sleeved on the force transmission sleeve 21, a circular groove 221 is coaxially formed in one end, close to the tensioning structure 3, of the outer sleeve 22, and the bottom surface of the circular groove 221 abuts against the end face of the force transmission sleeve 21. The valve connecting sleeve 23 is coaxially sleeved on the force transmission sleeve 21, two ends of the force transmission sleeve 21 extend out of the valve connecting sleeve 23, one end of the valve connecting sleeve 23 close to the tensioning structure 3 extends out of the circular groove 221, the valve connecting sleeve 23 is located between the force transmission sleeve 21 and the outer sleeve 22 at the moment, the outer sleeve 22 cannot cover the valve connecting sleeve 23, and the valve connecting sleeve 23 cannot cover the force transmission sleeve 21. When the valve needs to be disassembled, the valve is closed firstly, one end of the valve connecting sleeve 23, which extends out of the force transmission sleeve 21, is connected with the valve, the outer sleeve 22 is rotated to enable the outer sleeve 22 to move axially towards the direction close to the tensioning structure 3, the bottom surface of the circular groove 221 on the outer sleeve 22 abuts against the end surface of the force transmission outer sleeve, the outer sleeve 22 pushes the end surface of the force transmission sleeve 21 through the bottom surface of the circular groove 221 to enable the force transmission sleeve 21 to move axially, the force transmission sleeve 21 and the central shaft 1 in threaded connection with the force transmission sleeve 21 move axially together, and the central shaft 1 can extend into the valve until the second end of. The valve is opened, the outer sleeve 22 is rotated to enable the central shaft 1 to extend into a pipeline connected with the valve, the fixing structure 24 is used for connecting the force transmission sleeve 21 and the outer sleeve 22, the central shaft 1 in threaded connection with the force transmission sleeve 21 is rotated to enable the central shaft 1 to retreat in the axial direction, the force transmission sleeve 21 in threaded fit with the central shaft 1 is limited by the bottom surfaces of the circular grooves 221 of the outer sleeve 22 and the outer sleeve 22, the outer sleeve 22 is limited by the valve connecting sleeve 23 and the valve to be replaced, and the force transmission sleeve 21 cannot move in the axial direction. When the central shaft 1 returns in the axial direction, because the elastic sealing cylinder 31 and the split slip 32 in the tensioning structure 3 are coaxially sleeved on the central shaft 1, and one end of the elastic sealing cylinder 31 abuts against the end surface of one end of the force transmission sleeve 21 extending out of the valve connecting sleeve 23, the other end of the elastic sealing cylinder 31 abuts against the first end of the split slip 32, the second end of the split slip 32 abuts against the chamfer 12 of the cylindrical protrusion 11, the diameter of which is greater than that of the central shaft 1 and is located at the first end of the central shaft 1, the elastic sealing cylinder 31 and the split slip 32 can be pressed on the end surface of the force transmission sleeve 21 by the cylindrical protrusion 11, the elastic sealing cylinder 31 is compressed in the axial direction to radially tension the pipeline, the pipeline sealing is realized, and the split slip 32 can be spread by the chamfer of the cylindrical protrusion 11 to radially expand and be clamped on the pipeline. The split type slip 32 can limit the position of the elastic sealing cylinder 31 after the elastic sealing cylinder 31 is tensioned, and the phenomenon that oil overflows due to shaking of the elastic sealing cylinder 31 is avoided. The whole sealing effect is good and the operation is simple. Finally, the valve connecting sleeve 23 and the outer sleeve 22 are removed from the force transmission sleeve 21 together to complete the removal of the valve, and then a new valve is installed and the plugging device is removed by adopting the reverse flow of the operation. The whole operation is simpler and the time required for valve replacement is less.

As shown in fig. 1, the fixing structure 24 may include an annular plate 241 and a set screw 242, the annular plate 241 is coaxially connected to an end of the force transmission sleeve 21 away from the tensioning structure 3, an outer diameter of the annular plate 241 is smaller than an outer diameter of the force transmission sleeve 21, the set screw 242 is screwed on the outer sleeve 22, and a threaded hole 241a corresponding to the set screw 242 is formed on the annular plate 241.

In this arrangement, the set screw 242 on the outer sleeve 22 may be threadedly engaged with the annular plate 241, and since the annular plate 241 is fixedly attached to the force transmission sleeve 21, the set screw 242 may be inserted into the threaded hole 241a on the annular plate 241 to fixedly attach the outer sleeve 22 to the force transmission sleeve 21, thereby preventing the position of the force transmission sleeve 21 and the central shaft 1 relative to the valve attachment sleeve 23 from changing. Also in this arrangement, the threaded connection between the force-transmitting sleeve 21 and the central shaft 1 is not affected by the connection of the set screw 242, since the set screw 242 is connected to the annular plate 241.

Optionally, the annular plate 241 is coaxially sleeved on the central shaft 1, and a sealing ring 4 is arranged between the inner wall of the annular plate 241 and the outer wall of the central shaft 1.

The arrangement can realize the sealing of the force transmission sleeve 21 and the central shaft 1 without influencing the threaded connection of the force transmission sleeve 21 and the central shaft 1, and avoid the influence on the personal safety of workers due to the leakage of oil.

In other embodiments provided by the present disclosure, a sealing ring 4 may also be provided between the force transmission sleeve 21 and the central shaft 1, which is not limited by the present disclosure.

In other embodiments provided by the present disclosure, the fixation structure may also include only a set screw. The present disclosure is not limited thereto.

As shown in fig. 1, the replacement valve stopper may further comprise a bearing 5, the bearing 5 being arranged between the outer sleeve 22 and the force transmission sleeve 21.

The arrangement of the bearing 5 can reduce the friction between the outer sleeve 22 and the force transmission sleeve 21, and prolong the service life of the plugging device.

Alternatively, the force transmission sleeve 21 may comprise a first sleeve 211 and a second sleeve 212, the outer sleeve 22 and the valve connecting sleeve 23 are both disposed on the first sleeve 211, the first sleeve 211 extends out of the valve connecting sleeve 23, one end of the second sleeve 212 is connected to one end of the first sleeve 211, and the other end of the second sleeve 212 is used to abut against the elastic sealing cylinder 31.

In this arrangement, the resilient seal tube 31 and the second sleeve 212 can be removed from the central shaft 1 and then reinstalled when the resilient seal tube 31 is improperly installed, thereby facilitating adjustment of the position of the resilient seal tube 31.

Optionally, the end surface of the first sleeve 211 close to the second sleeve 212 has a protrusion, and the end surface of the second sleeve 212 close to the first sleeve 211 has a groove corresponding to the protrusion. The first sleeve 211 and the second sleeve 212 can be conveniently disassembled.

Optionally, a sealing ring 4 may be provided between the outer wall of the force transmission sleeve 21 and the inner wall of the valve connecting sleeve 23. The sealing effect of the plugging device is improved.

The force transmission sleeve 21 is slidable relative to the valve connection sleeve 23, the sliding direction of the force transmission sleeve 21 being parallel to the axis 1a of the central shaft 1.

As shown in fig. 1, a clip 231 may be disposed at an end of the valve connecting sleeve 23 near the tensioning structure 3.

The valve connecting sleeve 23 is provided with a clamp 231 at one end close to the tensioning structure 3, so that the valve connecting sleeve 23 and the valve can be conveniently disassembled and assembled.

Fig. 2 is a schematic structural diagram of the split slip provided in the embodiment of the present disclosure, as shown in fig. 2, the split slip 32 may include a plurality of arc plates 321, the plurality of arc plates 321 are arranged along the circumference of the central shaft 1 at equal intervals, the outer wall of each arc plate 321 is provided with a plurality of coaxial conical clamping plates 322, and the diameter of the outer wall of each conical clamping plate 322 is gradually reduced in the direction from the tensioning structure 3 to the cylindrical protrusion 11.

When split type slips 32 received the compression, the chamfer face on the circular arch 11 can strut the arc 321 among the split type slips 32, the toper shape cardboard 322 on the arc 321 also can expand along with the arc 321, the diameter of the outer wall of toper shape cardboard 322 reduces in the direction by tight structure 3 to the cylindrical arch 11 that rises gradually, the pipeline can be grasped to the terminal surface that toper shape cardboard 322 is close to tight structure 3 that rises, realizes the function of the rigidity of split type pipe clip 32.

Optionally, the end surfaces of adjacent conical clamping plates 322 can be abutted. The effect that a plurality of conical surface shape cardboard 322 chucking pipeline was better this moment. Illustratively, the plurality of conical-shaped clamping plates 322 on each arc-shaped plate 321 can be an integrally formed structure with the arc-shaped plate 321. The arc-shaped plate 321 is convenient to manufacture and install.

The split slips 32 may be secured against the resilient sealing cylinder 31 by other means.

In other implementations provided by the present disclosure, the split slip 32 may also include a conical cylinder and a slip sleeve, the conical cylinder is coaxially sleeved on the central shaft 1, one end of the conical cylinder, which is far away from the tensioning structure, abuts against the cylindrical protrusion 11, and an area of a cross section of an outer wall of the conical cylinder gradually decreases in a direction from the first end of the central shaft 1 to the second end of the central shaft. The slips sleeve is sleeved on the tapered cylinder, one end, close to the tension structure 3, of the tapered cylinder is located in the slips sleeve, the inner wall of the slips sleeve is attached to the outer wall of the tapered cylinder, one end, close to the tension structure 3, of the slips sleeve is abutted to the elastic sealing cylinder 31, multiple circles of burrs are arranged on the outer wall of the slips sleeve, and the pointed end of each burr protrudes towards the cylinder.

In this kind of setting, cylinder arch 11 can move in the direction of the second end of center pin 1 by the first end of center pin 1 along with center pin 1, and cylinder arch 11 can promote the conical cylinder to strut the slips sleeve this moment, and the burr on the slips sleeve can the chucking pipeline.

The split slips 32 may be steel split slips 32.

Fig. 3 is a schematic structural diagram of a central shaft and a cylindrical protrusion provided in the embodiment of the present disclosure, and a chamfer 12 may be provided between a side wall of the cylindrical protrusion 11 and two end surfaces of the cylindrical protrusion 11.

The chamfer 12 arranged between the side wall of the cylindrical protrusion 11 and the two end faces of the cylindrical protrusion 11 can make the central shaft 1 enter and exit the valves and pipelines on the Christmas tree more easily.

Referring to fig. 1 and 3, the second end of the split slip 32 abuts against the chamfer 12 of the cylindrical protrusion 11 close to the tensioning structure 3, an included angle between a generatrix 12a of the cylindrical protrusion 11 close to the chamfer 12 of the tensioning structure 3 and the axis 1a of the central shaft 1 may be α, and 0 ° < α is less than or equal to 40 °.

The second end of the split slip 32 abuts against the chamfer 12 of the cylindrical protrusion 11 close to the tensioning structure 3, an included angle between a bus 12a of the cylindrical protrusion 11 close to the chamfer 12 of the tensioning structure 3 and the axis 1a of the central shaft 1 can be alpha, and the alpha is smaller than or equal to 0 degrees and smaller than or equal to 40 degrees. Under this condition, the split slips 32 are also propped open by the chamfer 12 of the cylindrical protrusion 11 close to the tensioning structure 3, the propping diameter of the second end of the split slips 32 can be larger than that of the cylindrical protrusion 11, and at this moment, the split slips 32 can more effectively block the pipeline, so that the overall position fixation of the plugging device is realized.

Illustratively, α can range from 0 ° < α ≦ 20 °.

When the range of alpha is 0 degrees and less than or equal to 20 degrees, the clamping effect of the split slips 32 is better.

In other embodiments provided by the present disclosure, the chamfer between the side wall of the cylindrical protrusion 11 and the two end surfaces of the cylindrical protrusion 11 may also be a round chamfer, which is not limited by the present disclosure.

For example, the first end of the split slip 32 may be coaxially provided with a pushing ring 323, an annular protrusion 324 is coaxially provided on the inner wall of the pushing ring 323, the annular protrusion 324 is located between two end surfaces of the pushing ring 323, and an end surface of the annular protrusion 324 away from the cylindrical protrusion 11 abuts against the elastic sealing cylinder 31.

The push ring 323 and the annular bulge 324 on the split slip 32 can prevent the elastic sealing cylinder 31 from popping up the push ring 323, and ensure the compression effect of the elastic sealing cylinder 31.

Fig. 4 is a schematic view of the tensioning structure provided in the embodiment of the disclosure, referring to fig. 2 and 4, the replacement valve plugging device further includes a mounting cylinder 33, the mounting cylinder 33 is sleeved on the central shaft 1, and the mounting cylinder 33 is located between the central shaft 1 and the elastic sealing cylinder 31.

The elastic sealing cylinder 31 and the mounting cylinder 33 have a large friction force therebetween, so that the elastic sealing cylinder 31 can be prevented from sliding relatively to the central shaft 1 in the axial direction of the central shaft 1, and stable sealing of the elastic sealing cylinder 31 can be ensured.

As shown in fig. 4, an annular groove 331 may be coaxially formed on the outer wall of the mounting cylinder 33, and the elastic sealing cylinder 31 is located in the annular groove 331.

The outer wall of the mounting cylinder 33 is coaxially provided with an annular groove 331, and the elastic sealing cylinder 31 is positioned in the annular groove 331, so that the elastic sealing cylinder 31 can be conveniently mounted and fixed.

As shown in fig. 4, the tensioning structure 3 may further include an annular fixing plate 34 and a fixing ring 35, the annular fixing plate 34 is sleeved on the mounting cylinder 33 and located in the annular groove 331, one end of the annular fixing plate 34 abuts against the end surface of the force transmission sleeve 21, the other end of the annular fixing plate 34 abuts against the elastic sealing cylinder 31, the inner wall of the fixing ring 35 is in threaded fit with the outer wall of the force transmission sleeve 21, and one end of the fixing ring 35, which is far away from the force transmission sleeve 21, compresses the annular fixing plate 34.

The fixing ring 35 can be screwed on the outer wall of the force transmission sleeve 21, the fixing ring 35 presses the annular fixing plate 34 into the annular groove 331 of the mounting cylinder 33, so that the mounting cylinder 33 is pressed on the central shaft 1, the sliding of the mounting cylinder 33 and the annular fixing plate 34 and other structures is avoided, and the elastic sealing cylinder 31 is pressed on the annular fixing plate 34 to complete tensioning. This arrangement facilitates the installation of the elastic sealing cylinder 31 and prevents the elastic sealing cylinder 31 from sliding.

As shown in fig. 4, the tensioning structure 3 may further include a compression ring 36, the compression ring 36 is coaxially sleeved on the annular fixing plate 34, one side of the compression ring 36 abuts against an end surface of the fixing ring 35, the other side of the compression ring 36 abuts against the elastic sealing cylinder 31, and the compression ring 36 compresses the elastic sealing cylinder 31.

The compression ring 36 can prevent the elastic sealing cylinder 31 from sliding and compressing the annular fixing plate 34 when the elastic sealing cylinder 31 is under pressure, one end of the elastic sealing cylinder 31 can only abut against the annular fixing plate 34 when the elastic sealing cylinder 31 is under pressure, the middle part of the elastic sealing cylinder 31 transversely expands, and finally expands to seal a pipeline.

As shown in fig. 4, the tensioning structure 3 may further include an annular pad 37, the annular pad 37 is coaxially sleeved on the central shaft 1, one end of the annular pad 37 abuts against one end of the force transmission sleeve 21, and the other end of the annular pad 37 abuts against one end of the mounting cylinder 33 and one end of the annular fixing plate 34.

The increase of the annular backing plate 37 can increase the friction between the force transmission sleeve 21 and the annular fixing plate 34 and the mounting cylinder 33, and facilitate the quick positioning and mounting of the mounting cylinder 33 and the annular fixing plate 34.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (10)

1. A plug for replacing a valve is characterized by comprising a central shaft (1), a pushing structure (2) and a tensioning structure (3), wherein a cylindrical bulge (11) is coaxially connected to the first end of the central shaft (1), the diameter of the cylindrical bulge (11) is larger than that of the central shaft (1), chamfers (12) are arranged between the side wall of the cylindrical bulge (11) and two end faces of the cylindrical bulge (11),

the push structure (2) is close to the second end of the central shaft (1) and is arranged, the push structure (2) comprises a force transmission sleeve (21), an outer sleeve (22) and a valve connecting sleeve (23), the inner wall of the force transmission sleeve (21) is in threaded fit with the outer wall of the central shaft (1), the outer sleeve (22) is coaxially sleeved on the force transmission sleeve (21), the outer sleeve (22) is close to one end of the tensioning structure (3) and is coaxially provided with a circular groove (221), the bottom surface of the circular groove (221) is abutted to the end surface of one end of the force transmission sleeve (21), the valve connecting sleeve (23) is coaxially sleeved on the force transmission sleeve (21), the two ends of the force transmission sleeve (21) extend out of the valve connecting sleeve (23), and the outer wall of the valve connecting sleeve (23) is in threaded fit with the side wall of the circular groove (221), one end of the valve connecting sleeve (23) close to the tensioning structure (3) extends out of the circular groove (221), the pushing structure (2) further comprises a fixing structure (24) for connecting and separating the force transmission sleeve (21) and the outer sleeve (22),

tight structure (3) of rising is close to the first end of center pin (1) is arranged, tight structure (3) of rising includes elastic seal section of thick bamboo (31) and split type slips (32), elastic seal section of thick bamboo (31) with equal coaxial cover of split type slips (32) is in on center pin (1), elastic seal section of thick bamboo (31) one end with the terminal surface of biography power sleeve (21) offsets, the other end of elastic seal section of thick bamboo (31) with the first end of split type slips (32) offsets, the second end of split type slips (32) with cylinder arch (11) are close to tight structure (3) of rising chamfer (12) offset.

2. A replacement valve stopper according to claim 1 further comprising a mounting cylinder (33), said mounting cylinder (33) fitting over said central shaft (1) and said mounting cylinder (33) being located between said central shaft (1) and said resilient sealing cylinder (31).

3. The replacement valve stopper according to claim 2 wherein the outer wall of the mounting cylinder (33) is coaxially provided with an annular groove (331), and the elastic sealing cylinder (31) is located in the annular groove (331).

4. The replacement valve plugging device according to claim 3, wherein the tensioning structure (3) further comprises an annular fixing plate (34) and a fixing ring (35), the annular fixing plate (34) is sleeved on the mounting cylinder (33) and located in the annular groove (331), one end of the annular fixing plate (34) abuts against the end surface of the force transmission sleeve (21), the other end of the annular fixing plate (34) abuts against the elastic sealing cylinder (31), the inner wall of the fixing ring (35) is in threaded fit with the outer wall of the force transmission sleeve (21), and one end, far away from the force transmission sleeve (21), of the fixing ring (35) presses the annular fixing plate (34).

5. The replacement valve plugging device according to claim 4, wherein the tensioning structure (3) further comprises a compression ring (36), the compression ring (36) is coaxially sleeved on the annular fixing plate (34), one side of the compression ring (36) abuts against an end face of the fixing ring (35), the other side of the compression ring (36) abuts against the elastic sealing cylinder (31), and the compression ring (36) compresses the elastic sealing cylinder (31).

6. The plug for replacing the valve according to claim 4, wherein the tensioning structure (3) further comprises an annular pad (37), the annular pad (37) is coaxially sleeved on the central shaft (1), one end of the annular pad (37) abuts against one end of the force transmission sleeve (21), and the other end of the annular pad (37) abuts against one end of the mounting cylinder (33) and one end of the annular fixing plate (34) simultaneously.

7. The replacement valve plugging device according to any one of claims 1 to 6, wherein a push ring (323) is coaxially arranged at a first end of the split slip (32), an annular protrusion (324) is coaxially arranged on an inner wall of the push ring (323), the annular protrusion (324) is located between two end faces of the push ring (323), and an end face, far away from the cylindrical protrusion (11), of the annular protrusion (324) abuts against the elastic sealing cylinder (31).

8. The replacement valve plugging device according to any one of claims 1 to 6, wherein the split slip (32) comprises a plurality of arc plates (321), the plurality of arc plates (321) are arranged at equal intervals along the circumference of the central shaft (1), a plurality of coaxial conical clamping plates (322) are arranged on the outer wall of each arc plate (321), and the diameter of the outer wall of each conical clamping plate (322) is gradually reduced in the direction from the tensioning structure (3) to the cylindrical protrusion (11).

9. The plug for replacing a valve according to any one of claims 1 to 6, wherein an included angle between a generatrix (12a) of the cylindrical protrusion (11) close to the chamfer (12) of the tensioning structure (3) and the axis (1a) of the central shaft (1) is α, and is 0 ° < α ≦ 40 °.

10. The replacement valve stopper according to any one of claims 1 to 6, wherein the fixing structure (24) comprises an annular plate (241) and a set screw (242), the annular plate (241) is coaxially connected to one end of the force transmission sleeve (21) far away from the tensioning structure (3), the outer diameter of the annular plate (241) is smaller than that of the force transmission sleeve (21), the set screw (242) is in threaded connection with the outer sleeve (22), and a threaded hole (241a) corresponding to the set screw (242) is formed in the annular plate (241).

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