CN215115608U

CN215115608U - Sealing device

Info

Publication number: CN215115608U
Application number: CN202120366099.2U
Authority: CN
Inventors: 朱应彬; 张洁; 黄勇; 孙勇; 雷家维; 熊恒; 霍肖寒
Original assignee: Dec Guangzhou Heavy Machinery Co ltd
Current assignee: Dec Guangzhou Heavy Machinery Co ltd
Priority date: 2021-02-08
Filing date: 2021-02-08
Publication date: 2021-12-10
Anticipated expiration: 2031-02-08

Abstract

The utility model discloses a sealing device, which comprises a connecting rod, wherein one end of the connecting rod is provided with a first plugging structure, the other end of the connecting rod is provided with a second plugging structure, and the first plugging structure and/or the second plugging structure are detachably connected with the connecting rod; the second plugging structure is provided with a first abutting part, and a first sealing element used for abutting against the inner wall surface of the pipe fitting is sleeved on the outer side wall of the second plugging structure. The first blocking structure and the second blocking structure can block the pressure test medium by blocking two ends of the pipe fitting, so that sealing during pressure test inside the pipe fitting is realized. The first sealing piece enables the second plugging structure to be used for preventing pressure test media flowing into the pipe fitting from leaking, the first plugging structure, the first abutting portion and the pipe fitting can enable the sealing device to be fixed on the pipe fitting after abutting, axial stress of the first sealing piece is reduced, the possibility of bursting of the first sealing piece is reduced, and the service life of the first sealing piece is prolonged.

Description

Sealing device

Technical Field

The utility model belongs to the technical field of nuclear power equipment, concretely relates to nuclear power equipment pressure test frock.

Background

The reactor pressure vessel is the most core equipment of the nuclear island, is an important pressure boundary and an important safety barrier of a primary circuit, and has extremely high reliability and safety so as to ensure that the reactor pressure vessel can keep safe and reliable operation under various working conditions and avoid serious accidents such as vessel damage or radioactive coolant leakage. The neutron measurement tube of the nuclear power reactor pressure vessel is used for detecting the flux measurement of neutrons (or gamma rays) in a reactor, monitoring the fission power distribution in the reactor core and determining the fuel consumption condition of fuel, and simultaneously, the flux measurement is used for determining the distortion characteristic of the neutron flux in the reactor core so as to guide the action of a reactor control rod.

The neutron measuring tube is made of nickel-based material and integrally machined and welded at the lower bottom circle of the reactor pressure vessel. In the case of the reactor pressure vessel, the product needs to be subjected to a bulk pressure test for the tightness and compressive strength of the pressure receiving member. In general, the pressure medium can be selected from two broad classes, liquid and gas. The water has various characteristics of liquid, has small compressibility, and is transmitted to all aspects with equal pressure when being acted by pressure, and is uniformly acted on all parts of each pressed element. When water is used as a medium for pressure experiments, a small-flow high-pressure pump is generally used for providing pressure, and if the pressure leaks or breaks, water leaks out, so that the pressure is rapidly reduced. In view of this factor, generally, the hydrostatic test has higher safety than the pneumatic test, and is the preferred method for the pressure test.

When the reactor pressure vessel of a part of projects is subjected to water pressure, the inner wall of the neutron measuring tube does not need to be subjected to water pressure test, namely, water does not need to be introduced into the neutron measuring tube. Inside the reactor pressure vessel, the end in the neutron measurement pipe end container is sealed, and the water pressure requirement can be realized. After the water pressure is finished, the self-sealing device is jacked open through the jacking rod, and the water can be drained by utilizing gravity. In most of the existing projects, when the reactor pressure vessel is subjected to water pressure, the neutron measurement pipe needs to be subjected to inner wall water pressure at the same time, namely, water needs to be introduced into the neutron measurement pipe. If the prior art is adopted, the inner wall of the neutron measurement tube cannot be subjected to hydrostatic test and cannot meet the technical requirements, so that the prior sealing device cannot be used any more.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model aims at providing a sealing device to realize the pipe fitting inner wall and carry out the sealed when pressure test.

In order to achieve the purpose, the utility model discloses realize according to following technical scheme:

a sealing device comprises a connecting rod, wherein one end of the connecting rod is provided with a first plugging structure used for being abutted against a pipe fitting, the other end of the connecting rod is provided with a second plugging structure, and the first plugging structure and/or the second plugging structure are/is detachably connected with the connecting rod; the second plugging structure is provided with a first abutting part used for abutting against the pipe fitting, and a first sealing element used for abutting against the inner wall surface of the pipe fitting is sleeved on the outer side wall of the second plugging structure.

Preferably, the second blocking structure comprises a connecting sleeve sleeved on the connecting rod and a clamping body sleeved on the connecting rod, and the first abutting part and the first sealing element are both arranged on the connecting sleeve; the clamping body is connected with one end, far away from the first plugging structure, of the connecting sleeve in an abutting mode, and the clamping body is provided with a first moving path far away from the connecting sleeve.

Preferably, the clamping body is in threaded connection with the connecting rod.

Preferably, the connecting rod is sleeved with a second sealing element, the inner side wall of the second sealing element is abutted with the outer side wall of the connecting rod, and the outer side wall of the second sealing element is abutted with the inner side wall of the connecting sleeve.

Preferably, an extension rod section is arranged at one end, far away from the first blocking structure, of the connecting rod, and the diameter of the extension rod section is smaller than that of the connecting rod.

Preferably, the second blocking structure is provided with a first connecting part for connecting with a disassembling tool.

Preferably, the sealing device further includes a connecting body, the connecting body is provided with a second connecting portion connected to the first connecting portion, the connecting body further includes a second abutting portion for abutting against the pipe, and the second abutting portion has a second moving path for moving to abut against the pipe.

Preferably, the first connection portion comprises an external thread structure provided on an outer side wall of the second blocking structure.

Preferably, the length to diameter ratio of the connecting rod is greater than 50.

Preferably, the first blocking structure, the first abutting portion, and the first seal are arranged in this order along a rod length direction of the connecting rod.

Compared with the prior art, the beneficial effects of the utility model are that:

the first blocking structure and the second blocking structure can block the pressure test medium by blocking two ends of the pipe fitting, so that sealing during pressure test inside the pipe fitting is realized. The first sealing piece enables the second plugging structure to be used for preventing pressure test media flowing into the pipe fitting from leaking, the first plugging structure, the first abutting portion and the pipe fitting can enable the sealing device to be fixed on the pipe fitting after abutting, axial stress of the first sealing piece is reduced, the possibility of bursting of the first sealing piece is reduced, and the service life of the first sealing piece is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without any creative effort.

Fig. 1 is a schematic structural diagram of an embodiment of the sealing device of the present invention.

Fig. 2 is a partially enlarged view of a position a in fig. 1.

Fig. 3 is a partially enlarged view of a position B in fig. 1.

Fig. 4 is a schematic structural view of another embodiment of the sealing device of the present invention.

Fig. 5 is a schematic structural view of another embodiment of the sealing device of the present invention.

Wherein: 1-connecting rod, 11-extension rod section, 12-flow gap, 13-mounting groove, 131-gasket, 21-first blocking structure, 211-media channel, 22-second blocking structure, 221-first sealing element, 222-connecting sleeve, 2221-first abutting part, 223-clamping body, 224-second sealing element, 225-first connecting part, 23-connecting body, 231-dismantling cylinder, 2311-second connecting part, 2312-second abutting part, 3-pipe fitting.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be described in detail with reference to the accompanying drawings and detailed description. In addition, the embodiments and features of the embodiments of the present application may be combined with each other without conflict. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, and the described embodiments are merely some embodiments, rather than all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

With reference to fig. 1 to 3, this is an embodiment of the present invention, in particular: a sealing device comprises a connecting rod 1, wherein one end of the connecting rod 1 is provided with a first blocking structure 21 used for being abutted against a pipe fitting 3, the other end of the connecting rod 1 is provided with a second blocking structure 22, and the first blocking structure 21 and the second blocking structure 22 are detachably connected with the connecting rod 1; the second sealing structure 22 is provided with a first contact portion 2221 for contacting the pipe 3, and a first seal 221 for contacting the inner wall surface of the pipe 3 is fitted over the outer wall of the second sealing structure 22. The first blocking structure and the second blocking structure are detachably connected with the connecting rod, so that the sealing device can be installed inside a pipe fitting needing to be subjected to a pressure test, the inner wall surface of the connecting rod can be used for forming a flowing gap of a pressure test medium with the inner wall surface of the pipe fitting, and the first blocking structure and the second blocking structure can block the pressure test medium by blocking two ends of the pipe fitting, so that leakage is avoided. In this embodiment, since the pipe 3 is provided with a stepped hole therein, the first abutting portion 2221 is disposed such that the second blocking structure 22 is close to the end face of the first blocking structure 21. The first seal 221 may be provided as an O-ring, a cylindrical seal, or the like. The outer wall surface of the connecting rod 1 is used for forming a flow gap 12 with the inner wall surface of the pipe fitting 3, two ends of the flow gap 12 respectively extend to the first blocking structure 21 and the second blocking structure 22, and the first blocking structure 21 is provided with a medium channel 211 communicated with the flow gap 12. When the water pressure is applied, the test medium water can enter the pipe fitting 3 from the medium passage 211 and the flow gap 12, and the water pressure on the inner wall of the pipe fitting 3 is realized. First butt portion 2221 can set up to be used for with the inner wall butt of pipe fitting 3, can reduce the butt damage to the terminal surface of pipe fitting 3, make the terminal surface of pipe fitting 3 can be used for marking and this mark can avoid the damage better. The first abutting portion 2221 may abut against the pipe 3, for example, may be a tapered surface to abut against the inner wall of the pipe 3.

The second plugging structure 22 comprises a connecting sleeve 222 sleeved on the connecting rod 1 and a clamping body 223 sleeved on the connecting rod 1, wherein the clamping body 223 is in threaded connection with the connecting rod 1. Be equipped with mounting groove 13 on connecting rod 1, mounting groove 13 extends the setting along connecting rod 1's circumference, and second sealing member 224 sets up in mounting groove 13, and the endotheca is equipped with packing ring 131 in mounting groove 13, and the terminal surface of packing ring 131 is used for the terminal surface butt with second sealing member 224. The mounting groove 13 is provided as an annular groove in this embodiment. The second sealing piece 224 can be axially fixed in the mounting groove 13, the gasket 131 can prevent the second sealing piece 224 from colliding with the mounting groove 13, and the possibility that the second sealing piece 224 is damaged is reduced. Similarly, the first sealing member 221 may be provided with the mounting groove 13 and the gasket 131 of the structure on the connection sleeve 222. The connecting rod 1 is sleeved with a second sealing element 224, the inner side wall of the second sealing element 224 is abutted with the outer side wall of the connecting rod 1, and the outer side wall of the second sealing element 224 is abutted with the inner side wall of the connecting sleeve 222. The clamping body 223 is in threaded connection with the connecting rod 1, and the first sealing element 221 is kept at a required position by the thread self-locking function without applying extra force pretightening force. The first abutting portion 2221 and the first seal 221 are both provided on the connection sleeve 222; the clamping body 223 abuts against an end of the coupling sleeve 222 remote from the first blocking structure 21, and the clamping body 223 has a first movement path remote from the coupling sleeve 222. The clamping body 223 is provided as a nut in this embodiment, the connecting rod 1 is screwed with the clamping body 223, and the clamping body 223 can be far away from the connecting sleeve 222 along the axial direction of the connecting rod 1. Through the arrangement of the connecting sleeve 222 and the clamping body 223, the second plugging structure is more convenient to disassemble and assemble and can be more conveniently installed in the pipe fitting 3.

The connecting sleeve 222 of the second blocking structure 22 is provided with a first connecting portion 225 for connecting with a tool for detaching, so that the convenience of detaching the second blocking structure 22 is further improved. In this embodiment, the first connecting portion 225 is configured as a clamping groove, and the first connecting portion 225 is disposed on the connecting sleeve 222, so that the connecting sleeve can be connected with a dismounting tool such as a caliper, thereby realizing dismounting. The length-diameter ratio of the connecting rod 1 is larger than 50, and the lateral sealing form of the first sealing element 221 makes the sealing structure more suitable for the pipe to be tested with a larger long-diameter ratio. As shown in fig. 1 and 2, the connecting rod 1 has a length L and a diameter D1, and the aspect ratio is the ratio of the length L to the diameter D1. The first blocking structure 21, the first abutting portion 2221, and the first seal 221 are arranged in this order along the rod length direction of the connecting rod 1. When the sealing device is installed into the pipe fitting 3 from the first blocking structure 21 side, the first abutting portion 2221 interacts with the pipe fitting 3 before the first sealing member 221, so that the friction loss of the first sealing member 221 in the installation process is reduced, and the service life of the first sealing member 221 is prolonged. The connecting rod 1 is provided with a connecting plane, specifically a milled flat surface, on the side wall of the end close to the second blocking structure 22, so that the connecting rod 1 is clamped when the connecting sleeve 222 is removed again, and circumferential rotation of the connecting rod 1 is prevented.

When the sealing device is installed on the pipe member 3, the steps include first installing the second sealing member 224 and the washer 131 on the installation groove 13, then sleeving the connection sleeve 222 on which the first sealing member 221 has been installed on the connection rod 1, and then installing the clamping body 223 as a nut to smoothly push the connection sleeve 222 in place through a screw coupling structure. Then, one end of the connecting rod 1, which is provided with the first blocking structure 21, penetrates through the pipe fitting 3, and then the first blocking structure 21 is arranged, wherein the first blocking structure 21 comprises a nut and a washer, and the nut of the first blocking structure 21 is screwed down, so that the second blocking structure 22 can be pulled into place. The hydrostatic test can begin after installation in place. When the water needs to be drained, the connecting plane which is milled flat is clamped, the connecting sleeve 222 is removed, one end of the flow gap 12 is not blocked by the second blocking structure 22, and the water in the pressure container can be drained outwards through the medium channel 211 and the flow gap 12 in sequence. The first sealing element 221 and the second sealing element 224 can adopt polyurethane material O-shaped rings with 25% compression ratio, and the sealing effect is improved.

Example 2

As shown in fig. 4, the difference from embodiment 1 is mainly in the structure for removing the connection sleeve 222. The sealing device further comprises a connecting body 23, the connecting body 23 comprises a dismantling cylinder 231 sleeved on the connecting rod 1, the connecting body 23 is provided with a second connecting part 2311 connected with the first connecting part 225, the first connecting part 225 comprises an external thread structure arranged on the side wall of the second blocking structure 22, specifically on the side wall of the connecting sleeve 222, and the second connecting part 2311 comprises an internal thread structure arranged on the inner wall surface of the dismantling cylinder 231; the connecting body 23 further comprises a second abutment 2312 for abutment with the tube 3, the second abutment 2312 comprising an end face of the removal cylinder 231. The second abutment 2312 has a second movement path to be moved into abutment with the pipe 3, i.e., moved in the axial direction of the coupling sleeve 222 by the screw coupling structure.

When the connection sleeve 222 needs to be removed, the removal cylinder 231 of the connection body 23 is sleeved on the external thread structure on the outer side wall of the connection sleeve 222 through the internal thread structure until the connection body 23 moves along the axial direction of the connection sleeve 222 to abut against the pipe fitting 3, and then the connection body 23 continues to keep the trend of moving along the original direction, and the connection sleeve 222 is ejected out under the action of the internal thread structure and the external thread structure.

Example 3

In contrast to embodiment 1, as shown in fig. 5, the end of the connecting rod 1 remote from the first blocking structure 21 is provided with an extension rod segment 11, and the diameter of the extension rod segment 11 is smaller than the diameter of the connecting rod 1. As shown in fig. 5, the extension rod segment 11 has a diameter D2 and the connecting rod 1 has a diameter D1. The diameter of the extension rod section 11 is smaller than that of the connecting rod 1, so that the possibility that the second sealing piece 224 is scratched when the second sealing piece 224 is installed can be reduced, and the service life of the second sealing piece 224 is prolonged.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made by the technical spirit of the present invention to the above embodiments do not depart from the technical solution of the present invention, and still fall within the scope of the technical solution of the present invention.

Claims

1. A sealing device is characterized by comprising a connecting rod, wherein one end of the connecting rod is provided with a first plugging structure used for being abutted against a pipe fitting, the other end of the connecting rod is provided with a second plugging structure, and the first plugging structure and/or the second plugging structure are/is detachably connected with the connecting rod; the second plugging structure is provided with a first abutting part used for abutting against the pipe fitting, and a first sealing element used for abutting against the inner wall surface of the pipe fitting is sleeved on the outer side wall of the second plugging structure.

2. The sealing device according to claim 1, wherein the second blocking structure comprises a connecting sleeve sleeved on the connecting rod, and a clamping body sleeved on the connecting rod, and the first abutting portion and the first sealing member are both arranged on the connecting sleeve; the clamping body is connected with one end, far away from the first plugging structure, of the connecting sleeve in an abutting mode, and the clamping body is provided with a first moving path far away from the connecting sleeve.

3. The sealing device of claim 2, wherein the clamp body is threadably connected to the connecting rod.

4. The sealing device according to claim 2, wherein the connecting rod is sleeved with a second sealing element, an inner side wall of the second sealing element is abutted with an outer side wall of the connecting rod, and an outer side wall of the second sealing element is abutted with an inner side wall of the connecting sleeve.

5. A sealing arrangement according to claim 4, wherein the end of the connecting rod remote from the first blocking structure is provided with an extension rod section having a smaller diameter than the connecting rod.

6. The sealing device of claim 1, wherein the second blocking structure is provided with a first connecting portion for connecting with a dismantling tool.

7. The sealing device according to claim 6, further comprising a connecting body provided with a second connecting portion connected with the first connecting portion, the connecting body further comprising a second abutting portion for abutting against the pipe, the second abutting portion having a second moving path to move into abutment against the pipe.

8. The sealing device of claim 6, wherein the first connection portion comprises an external thread structure disposed on an exterior sidewall of the second block structure.

9. The sealing device of claim 1, wherein the length to diameter ratio of the connecting rod is greater than 50.

10. The sealing device according to claim 1, wherein the first blocking structure, the first abutting portion, and the first sealing member are arranged in series along a rod length direction of the connecting rod.