A valve seat disassembly and assembly tool

Abstract

The present invention relates to the technical field of disassembly and assembly tools, and provides a valve seat disassembly and assembly tool, which includes a screw rod, and a first hook and a second hook threadedly connected to the screw rod. The first hook and the second hook are used to move away from each other along the axial direction of the screw rod to be clamped on the inner circumferential surface of the valve seat to be disassembled and assembled. The first hook and the second hook are spaced apart and extend in the same direction. The extending directions of the first hook and the second hook are both perpendicular to the length direction of the screw rod. A first engaging disc is provided at the end of the first hook away from the screw rod, and the surface of the first engaging disc is perpendicular to the extending direction of the first hook. A second engaging disc is provided at the end of the second hook away from the screw rod, and the surface of the second engaging disc is perpendicular to the extending direction of the second hook. The valve seat disassembly and assembly tool provided by the present invention has a simple structure and simple operation, which is beneficial for the maintainer to disassemble and assemble the valve seat.

Description

Technical Field

[0001] The present invention relates to the technical field of disassembly and assembly tools, and more particularly to a valve seat disassembly and assembly tool. Background Art

[0002] When repairing the ball valve in a nuclear power plant, the valve seat needs to be removed. The valve seat is located in the valve cavity, see Figure 1 (Diagram of valve seat position).

[0003] The usual method of removing the valve seat is: the operator reaches into the valve cavity and directly removes the valve seat; or inserts a screwdriver between the valve seat and the valve body and uses the screwdriver to pry the valve seat.

[0004] There are many disadvantages and difficulties in the conventional disassembly method: (1) The valve seat and the valve body are interference fit, which results in a certain amount of friction and requires a certain amount of force to disassemble the valve seat; and there is a certain amount of rust or impurities between the valve seat and the valve body, which increases the resistance to disassembly; using the conventional disassembly method, the force points cannot be symmetrical on the circumference of the valve seat, and the applied force is not parallel to the axis of the valve seat, which increases the difficulty of disassembly and makes it impossible to disassemble the valve seat smoothly; (2) When using a screwdriver to disassemble the valve seat, it is difficult to place the screwdriver due to the non-ideal space in the ball valve cavity; the contact area between the screwdriver and the valve body and valve seat is small, which can easily damage the valve seat and valve body; (3) When the operator puts his hand into the valve cavity, the operator's latex gloves are easily scratched. In nuclear power plants, there are radioactive materials in the valve cavity of many ball valves. Once the latex gloves are scratched, the operator's hands are exposed and the operator will be contaminated by radioactive surface. Summary of the Invention

[0005] The purpose of the present invention is to provide a valve seat disassembly and assembly tool to solve the technical problem of great difficulty in disassembling and assembling the valve seat in the prior art.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is a valve seat disassembly and assembly tool, including a screw, and a first hook and a second hook threadedly connected to the screw, the first hook and the second hook being used to move away from each other along the axial direction of the screw to clamp on the inner circumferential surface of the valve seat to be disassembled, the first hook and the second hook are arranged at intervals and extend in the same direction, the extension directions of the first hook and the second hook are both perpendicular to the length direction of the screw, a first engaging disk is provided at the end of the first hook away from the screw, the surface of the first engaging disk is perpendicular to the extension direction of the first hook, a second engaging disk is provided at the end of the second hook away from the screw, the surface of the second engaging disk is perpendicular to the extension direction of the second hook, the first engaging disk extends in a direction away from the second engaging disk, and the second engaging disk extends in a direction away from the first engaging disk.

[0007] Further, a first through hole for the screw to pass through is formed at the end of the first hook connected to the screw, and a first thread cooperating with the screw is provided on the hole wall of the first through hole. A second through hole for the screw to pass through is formed at the end of the second hook connected to the screw, and a second thread cooperating with the screw is provided on the hole wall of the second through hole. The thread directions of the first thread and the second thread are opposite.

[0008] Further, the first engaging disc and the second engaging disc are semi-circular in shape, and their radii are adapted to the radius of the valve seat to be disassembled and assembled.

[0009] Further, a first chamfered portion is provided along the circumferential direction of the first engaging disc, and a second chamfered portion is provided along the circumferential direction of the second engaging disc.

[0010] Further, one end of the screw is an insertion end for inserting into the interior of a ball valve provided with a valve seat, and the other end is a rotating end for a repairer to rotate, and a rotating handle is provided at the rotating end.

[0011] Further, the length of the screw is greater than the depth of the ball valve provided with the valve seat.

[0012] Further, a connecting pipe is movably sleeved on the screw between the first hook and the second hook, and a support rod is provided on the connecting pipe. The length direction of the support rod is perpendicular to the length direction of the screw.

[0013] Further, a pull rod is fixedly sleeved on the support rod, and the length direction of the pull rod is perpendicular to the length direction of the support rod.

[0014] Further, the support rod is threadedly connected with a pull rod, the length direction of the pull rod is perpendicular to the length direction of the support rod, and a tightening nut for pulling the connecting pipe to move towards the pull rod is provided at the end of the support rod away from the connecting pipe.

[0015] Further, a support ring is provided on the connecting pipe, and the support ring is used to support the screw.

[0016] The beneficial effects of the valve seat disassembly and assembly tool provided by the present invention are as follows:

[0017] First, the first hook and the second hook that can move away from each other respectively abut against the inner circumferential surface of the valve seat, and an expansion force is applied to clamp the valve seat. By applying a tensile force along the axial direction of the valve seat on the screw, the valve seat can be disengaged from the ball valve. Its structure is simple and the operation is simple, which is beneficial for the repairer to disassemble and assemble the valve seat;

[0018] Secondly, the first hook and the second hook are spaced apart and their extending directions are both perpendicular to the length direction of the screw rod. The first hook and the second hook are inserted into the valve seat along the axial direction of the valve seat. When the first hook and the second hook catch the valve seat, the length direction of the screw rod is perpendicular to the axial direction of the valve seat. This design facilitates the maintainer to apply a pulling force parallel to the axial direction of the valve seat on the screw rod, which is beneficial for the maintainer to pull out the valve seat.

[0019] Thirdly, the first hook and the second hook can be symmetrically caught on the inner circumferential surface of the valve seat, that is, there are two force application points of the valve seat disassembly and assembly tool and they are symmetrically applied to the inner circumferential surface of the valve seat, so that when disassembling the valve seat, the valve seat is uniformly stressed as a whole, avoiding damage to the valve seat due to uneven stress.

[0020] Finally, the thread directions of the first thread provided on the first hook and the second thread provided on the second hook are opposite. By rotating the screw rod, the first hook and the second hook can move closer to or away from each other. Its operation is simple, which is beneficial for the maintainer to disassemble and assemble the valve seat. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 is a cross-sectional view of the valve seat disassembly and assembly tool provided by the embodiment of the present invention;

[0023] Figure 2 is a left view of the valve seat disassembly and assembly tool provided by the embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view of the ball valve provided by the embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the valve seat disassembly and assembly tool provided by the embodiment of the present invention for disassembling and assembling the valve seat;

[0026] Figure 5 is a schematic diagram of the valve seat disassembly and assembly tool provided by the embodiment of the present invention for disassembling and assembling the valve seat;

[0027] Figure 6 is a schematic diagram of the valve seat disassembly and assembly tool provided by the embodiment of the present invention for disassembling and assembling the valve seat;

[0028] Figure 7 is a schematic diagram of the valve seat disassembly and assembly tool provided by the embodiment of the present invention for disassembling and assembling the valve seat;

[0029] Figure 8It is the front view of the folded valve seat disassembly and assembly tool provided by the embodiment of the present invention.

[0030] The reference numerals in the figure are as follows:

[0031] Valve seat disassembly and assembly tool 1 Opening 22 Support rod 17 Ball valve 2 First engaging disc 121 Tie rod 18 Valve seat 3 Second engaging disc 131 Fixed end 181 Valve cavity 21 First chamfered portion 122 Prying end 182 Screw rod 11 Second chamfered portion 132 Tightening nut 19 First hook 12 Insertion end 111 Support ring 20 Second hook 13 Rotating end 112 First perforation 14 Rotating handle 113 Second perforation 15 Connecting pipe 16 Specific embodiments

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected or indirectly connected to the other element.

[0034] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention, rather than indicating that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating relative importance or indicating the number of technical features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined. The specific implementation of the present invention will be described in more detail below with reference to specific embodiments:

[0036] As Figures 1 to 3 shown, a valve seat disassembly and assembly tool provided by an embodiment of the present invention, the valve seat disassembly and assembly tool 1 is used for disassembling and assembling a valve seat 3 fixed inside a ball valve 2, the shape of the valve seat 3 is circular, and since the valve seat 3 is located in a valve cavity 21 of the ball valve 2, it is difficult for a maintainer to disassemble and assemble the valve seat.

[0037] The valve seat disassembly and assembly tool 1 includes a screw rod 11, and a first hook 12 and a second hook 13 threadedly connected to the screw rod 11. The first hook 12 and the second hook 13 are used to move away from each other along the axial direction of the screw rod 11 to be clamped on the inner peripheral surface of the valve seat 3 to be disassembled and assembled. The first hook 12 and the second hook 13 are spaced apart and extend in the same direction. The extending directions of the first hook 12 and the second hook 13 are both perpendicular to the length direction of the screw rod 11. A first engaging disc 121 is provided at the end of the first hook 12 away from the screw rod 11. The surface of the first engaging disc 121 is perpendicular to the extending direction of the first hook 12. A second engaging disc 131 is provided at the end of the second hook 13 away from the screw rod 11. The surface of the second engaging disc 131 is perpendicular to the extending direction of the second hook 13. The first engaging disc 121 extends in a direction away from the second engaging disc 131, and the second engaging disc 131 extends in a direction away from the first engaging disc 121.

[0038] The working principle of the valve seat disassembly and assembly tool 1 in this embodiment is as follows:

[0039] As Figures 4 to 7 shown, by rotating the screw rod 11, the first hook 12 and the second hook 13 approach each other, driving the first engaging disc 121 and the second engaging disc 131 to approach each other until the distance between the ends of the first engaging disc 121 and the second engaging disc 131 is less than the inner diameter of the valve seat 3 to be disassembled and assembled. Insert the valve seat disassembly and assembly tool 1 through the opening 22 of the ball valve 2, and make the first hook 12 and the second hook 13 insert into the gap between the valve seat 3 and the ball valve 2. Then rotate the screw rod 11 so that the first hook 12 and the second hook 13 move away from each other until the first hook 12 and the second hook 13 respectively abut against the inner peripheral surface of the valve seat 3. Continue to rotate the screw rod 11 so that the first hook 12 and the second hook 13 exert an expanding force on the valve seat 3, and then clamp on the valve seat 3. At this time, the maintainer can apply a pulling force along the axial direction of the valve seat 3 on the screw rod 11 to detach the valve seat 3 from the ball valve 2.

[0040] The beneficial effects of the valve seat disassembly and assembly tool 1 provided in this embodiment are as follows:

[0041] First of all, the first hook 12 and the second hook 13 that can move away from each other respectively abut against the inner peripheral surface of the valve seat 3 and exert an expanding force to clamp the valve seat 3. By applying a pulling force along the axial direction of the valve seat 3 on the screw rod 11, the valve seat 3 can be detached from the ball valve 2. Its structure is simple and the operation is simple, which is beneficial for the maintainer to disassemble and assemble the valve seat 3;

[0042] Secondly, the first hook 12 and the second hook 13 are arranged at intervals and their extending directions are both perpendicular to the length direction of the screw 11. The first hook 12 and the second hook 13 are inserted into the valve seat 3 along the axial direction of the valve seat 3. When the first hook 12 and the second hook 13 catch the valve seat 3, the length direction of the screw 11 is perpendicular to the axial direction of the valve seat 3. This design facilitates the maintainer to apply a pulling force parallel to the axial direction of the valve seat 3 on the screw 11, which is beneficial for the maintainer to pull out the valve seat 3;

[0043] Thirdly, the first hook 12 and the second hook 13 can be symmetrically clamped on the inner peripheral surface of the valve seat 3, that is, there are two force application points of the valve seat disassembly and assembly tool 1 of this embodiment and they are symmetrically applied on the inner peripheral surface of the valve seat 3. When disassembling the valve seat 3, the valve seat 3 is evenly stressed as a whole, avoiding damage to the valve seat 3 caused by uneven stress;

[0044] Finally, by setting the first engaging disk 121 perpendicular to the first hook 12, that is, when the first hook 12 extends into the valve seat 3 along the axial direction of the valve seat 3, the first engaging disk 121 passes through the valve seat 3 and can abut against the side of the valve seat 3 away from the screw 11. Similarly, the second engaging disk 131 also abuts against the side of the valve seat 3 away from the screw 11. That is, the first engaging disk 121 and the second engaging disk 131 can be inserted into the gap between the valve seat 3 and the ball valve 2, facilitating the maintainer to pull the valve seat 3.

[0045] Further, as a specific implementation manner of the valve seat disassembly and assembly tool 1 of the embodiment of the present invention, a first through hole 14 for the screw 11 to pass through is opened at the end of the first hook 12 connected to the screw 11. The inner wall of the first through hole 14 is provided with a first thread that cooperates with the screw 11. A second through hole 15 for the screw 11 to pass through is opened at the end of the second hook 13 connected to the screw 11. The inner wall of the second through hole 15 is provided with a second thread that cooperates with the screw 11. The thread directions of the first thread and the second thread are opposite. Correspondingly, external threads that cooperate with the first thread and the second thread are provided on the outer surface of the screw 11.

[0046] By making the thread directions of the first thread provided on the first hook 12 and the second thread provided on the second hook 13 opposite, the first hook 12 and the second hook 13 can be moved closer to or away from each other by rotating the screw 11. The operation is simple and is beneficial for the maintainer to disassemble and assemble the valve seat 3.

[0047] Further, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to the embodiment of the present invention, the shapes of the first engaging disc 121 and the second engaging disc 131 are semi-circular. With this design, when the first engaging disc 121 and the second engaging disc 131 are abutted against the valve seat 3, when the maintainer pulls the valve seat 3, the pulling force can be evenly applied to the valve seat 3, avoiding damage to the valve seat 3. At the same time, the uniform force application also avoids the unsmoothness during pulling, causing the valve seat 3 to tilt and get stuck in the ball valve 2.

[0048] Further, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to the embodiment of the present invention, the first engaging disc 121 is provided with a first chamfer portion 122 along its circumferential direction, and the second engaging disc 131 is provided with a second chamfer portion 132 along its circumferential direction. By providing the first chamfer portion 122 and the second chamfer portion 132, when the first engaging disc 121 and the second engaging disc 131 enter the gap between the valve seat 3 and the ball valve 2, it plays a guiding role, and at the same time, it can avoid the edges of the first engaging disc 121 and the second engaging disc 131 from damaging the valve seat 3.

[0049] Further, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to the embodiment of the present invention, one end of the screw rod 11 is an insertion end portion 111 for inserting into the ball valve 2 provided with the valve seat 3, and the other end thereof is a rotation end portion 112 for the maintainer to rotate. A rotation handle 113 is provided on the rotation end portion 112; by providing the rotation handle 113, it is convenient for the maintainer to rotate the screw rod 11, reducing the operation difficulty of the maintainer, reducing the labor fatigue of the maintainer, and at the same time, it is also convenient for the maintainer to extend the valve seat disassembly and assembly tool 1 into the ball valve 2 or take it out from the ball valve 2.

[0050] Further, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to the embodiment of the present invention, the length of the screw rod 11 is greater than the depth of the ball valve 2 provided with the valve seat 3; after the screw rod 11 extends into the ball valve 2, the rotation end portion 112 of the screw rod 11 is exposed outside the ball valve 2, facilitating the maintainer to hold and operate.

[0051] Further, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to the embodiment of the present invention, a connecting pipe 16 is movably sleeved on the screw rod 11 between the first hook 12 and the second hook 13. The connecting pipe 16 is fixedly connected with a support rod 17. The support rod 17 is fixedly connected to the outer side surface of the connecting pipe 16, and the length direction of the support rod 17 is perpendicular to the length direction of the screw rod 11; after the first hook 12 and the second hook 13 are clamped on the valve seat 3, a pulling force can be applied on the support rod 17 to drive the screw rod 11 to move, and then drive the first hook 12 and the second hook 13 to pull out the valve seat 3.

[0052] Optionally, as a specific implementation of the valve seat disassembly and assembly tool 1 of the embodiment of the present invention, the support rod 17 is fixedly sleeved with a pull rod 18, and the length direction of the pull rod 18 is perpendicular to the length direction of the support rod 17; by providing the pull rod 18, it is convenient for the maintainer to apply pulling force. Preferably, the length of the pull rod 18 is greater than the length of the screw 11, and the end of the pull rod 18 located inside the ball valve 2 is the fixed end 181, and the end exposed to the outside of the ball valve 2 is the prying end 182. The fixed end 181 of the pull rod 18 is pressed against the inner bottom surface of the ball valve 2. By using the lever principle, the prying end 182 of the pull rod 18 is pulled, which can generate a large pulling force on the pull rod 18, thereby achieving the effect of easily and smoothly disassembling the valve seat 3.

[0053] In addition, if Figure 8 As shown, the connecting tube 16 is movably sleeved on the screw 11, and the support rod 17 is fixedly arranged on the connecting tube 16. Preferably, the support rod 17 can be rotated with the screw 11 as the axis, that is, the pull rod 18 can be rotated with the screw 11 as the axis. The maintenance person can rotate the pull rod 18 to a position where it coincides with the first hook 12 and the second hook 13 before inserting the tool into the ball valve 2, so as to shorten the lateral length of the valve seat disassembly tool 1 to adapt to the ball valve 2 with a smaller valve port. After inserting the tool into the ball valve 2, the valve cavity 21 of the ball valve 2 is usually larger. The maintenance person can unfold the valve seat disassembly tool 1 inside the valve cavity 21, that is, rotate the pull rod 18 to a position away from the valve seat 3, so as to facilitate the maintenance person to apply force.

[0054] Optionally, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to an embodiment of the present invention, a pull rod 18 is threadedly connected to the support rod 17, the length direction of the pull rod 18 being perpendicular to the length direction of the support rod 17, and a tightening nut 19 for pulling the connecting tube 16 toward the pull rod 18 is provided at the end of the support rod 17 away from the connecting tube 16. The tightening nut 19 is a common hexagonal nut that cooperates with the thread on the pull rod 18 to prevent the pull rod 18 from disengaging from the light hole in the middle of the support rod 17; when the support rod 17 is fixed, tightening the nut with a wrench can generate a large pulling force on the pull rod 18, thereby making it easy and smooth to disassemble the valve seat 3.

[0055] Furthermore, as a specific embodiment of the valve seat disassembly and assembly tool 1 according to an embodiment of the present invention, a support ring 20 is provided on the connecting tube 16 to support the screw 11. The support ring 20 is made of ordinary steel plate and is circular in shape. It is welded to the screw 11 and has an outer diameter greater than that of the connecting tube 16, thereby supporting the screw 11.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A valve seat disassembly and assembly tool, characterized in that: The invention also provides a method for fixing the screw thread and the fixing member so that the fixing member can be fixed on the fixing member so as to avoid the damage to the fixing member. A connecting tube is movably sleeved on the screw between the first hook and the second hook, and the connecting tube is provided with a support rod, the length direction of the support rod being perpendicular to the length direction of the screw; the support rod can be rotated with the screw as an axis, and the pull rod can be rotated with the screw as an axis, so that the pull rod is rotated to a position overlapping with the first hook and the second hook. After extending into the interior of the ball valve, the maintenance worker can unfold the valve seat disassembly tool inside the valve cavity, that is, rotate the pull rod to a position away from the valve seat, which is convenient for the maintenance worker to apply force; The support rod is fixedly sleeved with a pull rod, the length direction of the pull rod being perpendicular to the length direction of the support rod; the end of the support rod away from the connecting pipe is provided with a tightening nut for pulling the connecting pipe toward the pull rod; the tightening nut is an ordinary hexagonal nut for cooperating with the thread on the pull rod to prevent the pull rod from being disengaged from the light hole in the middle of the support rod; The length of the pull rod is greater than the length of the screw rod. The end of the pull rod located inside the ball valve is a fixed end, and the end exposed outside the ball valve is a prying end. The fixed end of the pull rod is placed against the bottom surface of the ball valve, and the lever principle is used to pull the prying end of the pull rod, which can generate a large pulling force on the pull rod, thereby achieving the effect of easily and smoothly removing the valve seat.

2. The valve seat disassembly and assembly tool according to claim 1, characterized in that: The end portion of the first hook connected to the screw is provided with a first through-hole for the screw to pass through, and the hole wall of the first through-hole is provided with a first thread that cooperates with the screw. The end portion of the second hook connected to the screw is provided with a second through-hole for the screw to pass through, and the hole wall of the second through-hole is provided with a second thread that cooperates with the screw. The thread directions of the first thread and the second thread are opposite.

3. The valve seat disassembly and assembly tool according to claim 1, wherein: The first engaging disc and the second engaging disc are semicircular in shape, and the radius thereof matches the radius of the valve seat to be disassembled.

4. The valve seat disassembly and assembly tool according to claim 3, wherein: The first engaging disc is provided with a first chamfered portion along its own circumference, and the second engaging disc is provided with a second chamfered portion along its own circumference.

5. The valve seat disassembly and assembly tool according to any one of claims 1-4, characterized in that: One end of the screw is an insertion end for inserting into a ball valve provided with a valve seat, and the other end is a rotating end for being rotated by a maintenance worker, wherein the rotating end is provided with a rotating handle.

6. The valve seat disassembly and assembly tool according to any one of claims 1-4, characterized in that: The length of the screw is greater than the depth of the ball valve provided with the valve seat.

7. The valve seat disassembly and assembly tool according to any one of claims 1-4, characterized in that: The support rod is threadedly connected with a pull rod, the length direction of the pull rod is perpendicular to the length direction of the support rod, and a tightening nut for pulling the connecting pipe to move towards the pull rod is arranged at the end of the support rod away from the connecting pipe.

8. The valve seat disassembly and assembly tool according to any one of claims 1-4, characterized in that: A support ring is arranged on the connecting pipe, and the support ring is used for supporting the screw.

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