Nuclear-grade sealing joint suitable for quick release requirement

Abstract

The invention provides a nuclear-grade sealing joint suitable for quick release requirements, which comprises a joint body, and the joint body comprises a connecting part and a thread part which are connected in sequence; one end of the threaded part is connected with the connecting part, and the other end of the threaded part is a first wedge-shaped surface; the end plug is provided with an internal thread, a sealing part is arranged in the end plug, and the end face, close to one end of the thread, of the sealing part is a second wedge-shaped face; the connecting pipe connecting piece comprises a pipe cap, a first clamping sleeve joint and a second clamping sleeve joint; the pipe cap is provided with an internal thread, the first clamping sleeve connector and the second clamping sleeve connector are arranged in the pipe cap, the first clamping sleeve connector abuts against the pipe cap, the second clamping sleeve connector abuts against the first clamping sleeve connector, and the end face of the end, close to the thread, of the second clamping sleeve connector is a third wedge-shaped face; the joint body is connected with the end plug to plug a pipeline; the connector body is connected with the connecting pipe connecting piece to be connected with a pipeline. The device is convenient to disassemble and assemble and not prone to leakage.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power engineering, and in particular to a nuclear-grade sealing joint suitable for quick-disassembly requirements. Background Art

[0002] As a clean energy with mature technology, nuclear power does not emit sulfur dioxide, smoke, nitrogen oxides, carbon dioxide and other substances compared with thermal power. It has the advantages of low resource consumption, small environmental impact and strong energy security. It can meet the rapid growth of energy demand while taking into account ecological and environmental protection.

[0003] In order to ensure the stability and reliability of operation, nuclear power plants will conduct a series of sampling analysis, purging and draining work from time to time. When performing these tasks, the original sealing joints need to be disassembled, and then the corresponding sampling pipelines or purging and draining pipelines are connected, and the media in these pipelines will inevitably contain radioactive media. How to avoid the leakage of radioactive media during the above work process is very important for reducing the generation of radioactive waste and achieving green operation of nuclear power plants.

[0004] In the current design of sampling and drainage joints, most of them use isolation valves with additional pipe caps, plugs, quick connectors and other types. In nuclear safety level 1 piping systems, high-temperature and high-pressure nuclear safety levels 2 and 3 and non-nuclear piping systems, additional sealing welding will be added to the pipe cap connections according to the requirements of relevant standards and specifications.

[0005] In the above-mentioned non-welding pipe connection methods such as pipe caps, plugs, quick connectors, etc., pipe caps and plugs are sealed with the help of threads, and threads are generally not considered as an effective sealing type because the degree of fit between threads depends on the precision of machining. If the machining control accuracy is low, leakage caused by threaded connections is difficult to avoid.

[0006] At the same time, there is no objective evaluation standard for whether the thread installation is tightened properly, which depends largely on the experience of the installer, and it is easy to loosen during repeated installation and disassembly. When designing pipes that need to be threaded, a certain thread margin must be considered, which makes the wall thickness of some pipes in the pipe system exceed the normal design requirements, and the demand for this part of the pipe is small, which makes the procurement process difficult and the procurement price higher.

[0007] Some quick connectors can achieve a certain degree of sealing when disconnected by means of the internal valve core structure, but their sealing parts will use certain non-metallic materials. Non-metallic materials will creep during multiple disassembly and assembly processes, which will affect their sealing effect. At the same time, non-metallic materials are affected by their radiation resistance and high temperature resistance, and their use in nuclear power plants is greatly restricted.

[0008] Adding a sealed welded pipe cap joint can achieve resistance to high temperature and pressure, radiation, etc., and meet the requirements of the corresponding nuclear safety level. However, it is not easy to disassemble during frequent operations such as sampling and purging, and hot work is required. In addition, increasing the operating time in a radioactive environment will increase the radiation dose to personnel.

[0009] In view of this, the inventor of the present application has designed a nuclear-grade sealing joint suitable for quick-disassembly requirements in order to overcome the above-mentioned technical problems. Summary of the invention

[0010] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the sealing joint is easy to leak after disassembly or is not easy to disassemble, and to provide a nuclear-grade sealing joint suitable for quick disassembly requirements.

[0011] The present invention solves the above technical problems through the following technical solutions:

[0012] The present invention provides a nuclear-grade sealing joint suitable for quick-release requirements, which is characterized in that the nuclear-grade sealing joint comprises: a joint body, the joint body comprises a connecting part and a threaded part connected in sequence; the connecting part is used to connect with a pipeline, the threaded part has an external thread, one end of the threaded part is connected to the connecting part, and the other end of the threaded part is a first wedge surface; an end plugging, the end plugging has an internal thread, the interior of the end plugging has a sealing part, and the end surface of the sealing part close to one end of the thread is a second wedge surface; a pipe connecting piece, the pipe connecting piece comprises a pipe cap, a first ferrule joint and a second ferrule joint; the pipe cap has an internal thread, the first ferrule joint and the second ferrule joint are arranged inside the pipe cap, the first ferrule joint abuts against the pipe cap, the second ferrule joint abuts against the first ferrule joint, and the end surface of the second ferrule joint close to one end of the thread is a third wedge surface; the joint body is connected to the end plugging to block the pipeline; the joint body is connected to the pipe connecting piece to connect the pipeline.

[0013] According to one or more embodiments of the present invention, the joint body further includes a structural reinforcement portion, and one end of the threaded portion is connected to the connecting portion through the structural reinforcement portion.

[0014] According to one or more embodiments of the present invention, the structural reinforcement portion is an annular boss, and the inner annular surface of the annular boss is an inclined surface.

[0015] According to one or more embodiments of the present invention, the end plug is a one-piece piece.

[0016] According to one or more embodiments of the present invention, the inclination angles of the first wedge surface and the second wedge surface are complementary; the inclination angles of the first wedge surface and the third wedge surface are complementary.

[0017] According to one or more embodiments of the present invention, the tube cap comprises a first opening end and a second opening end, the internal thread of the tube cap is arranged near the first opening end, and the second opening end has an inner edge.

[0018] According to one or more embodiments of the present invention, the first ferrule joint abuts against the inner edge.

[0019] According to one or more embodiments of the present invention, the abutment portion between the first ferrule joint and the second ferrule joint is a wedge-shaped surface.

[0020] According to one or more embodiments of the present invention, the inner edge is perpendicular to the inner wall of the pipe cap; the cross-sectional shape of the first ferrule joint is a right-angled L-shape with a slope at one end, and its right-angled side abuts the inner edge; the cross-sectional shape of the second ferrule joint is an obtuse triangle.

[0021] According to one or more embodiments of the present invention, surfaces of the first ferrule joint and the second ferrule joint are locally hardened.

[0022] The positive and progressive effects of the present invention are:

[0023] The present invention is applicable to nuclear-grade sealing joints requiring quick disassembly and has at least the following advantages:

[0024] 1. The sealing joint of the present invention has high structural strength, reliable connection, and a leakage rate that meets corresponding requirements, and is suitable for use in high temperature and high pressure environments.

[0025] 2. The sealing joint of the present invention is easy to disassemble and install. Compared with the threaded joint with sealing welding, it significantly reduces the operation time of personnel, thereby reducing the radiation dose of personnel in the irradiated environment.

[0026] 3. The sealing joint of the present invention is relatively simple in composition, significantly reduces the weight of components compared to pipes that require thread processing, is more friendly to mechanical calculation and analysis of the pipe system, and does not need to be thickened relative to the main process pipe, thereby reducing the number of pipe specifications used. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments, in which the same reference numerals always represent the same features, wherein:

[0028] Figure 1a It is a schematic diagram of the combined state of the joint body and the end plug of the nuclear-grade sealing joint suitable for quick-disassembly requirements of the present invention.

[0029] Figure 1bIt is a schematic diagram of the disassembly state of the joint body and the end seal of a nuclear-grade sealing joint suitable for quick disassembly requirements of the present invention.

[0030] Figure 2a It is a schematic diagram of the combined state of the joint body and the pipe connector of the nuclear-grade sealing joint suitable for quick-disassembly requirements of the present invention.

[0031] Figure 2b It is a schematic diagram of the disassembly state of the joint body and the pipe connecting piece of the nuclear-grade sealing joint suitable for quick disassembly requirements of the present invention.

[0032] [Reference Signs]

[0033] Connector body 100

[0034] Connecting portion 110

[0035] Threaded portion 120

[0036] First wedge surface 130

[0037] Structural reinforcement 140

[0038] Inner ring surface 141

[0039] End plugging 200

[0040] Sealing part 210

[0041] Second wedge surface 220

[0042] Connecting piece 300

[0043] Pipe Cap 310

[0044] First open end 311

[0045] Second open end 312

[0046] Inner edge 313

[0047] First ferrule connector 320

[0048] Second ferrule connector 330

[0049] The third wedge surface 340 DETAILED DESCRIPTION

[0050] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0051] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Reference will now be made in detail to preferred embodiments of the present invention, examples of which are shown in the accompanying drawings. Wherever possible, the same reference numerals will be used in all drawings to represent the same or similar parts. In addition, although the terms used in the present invention are selected from well-known and commonly used terms, some of the terms mentioned in the specification of the present invention may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description herein. In addition, it is required to understand the present invention not only by the actual terms used, but also by the meaning implied by each term.

[0052] like Figure 1a to Figure 2b As shown, the present invention provides a nuclear-grade sealing joint suitable for quick-disassembly requirements, comprising:

[0053] The connector body 100 includes a connecting portion 110 and a threaded portion 120 which are connected in sequence; the connecting portion 110 is used to connect to a pipe, the threaded portion 120 has an external thread, one end of the threaded portion 120 is connected to the connecting portion 110, and the other end of the threaded portion 120 is a first wedge surface 130;

[0054] The end plug 200 has an internal thread, and the end of the end plug 200 has a sealing portion 210, and the end surface of the sealing portion 210 close to one end of the thread is a second wedge surface 220;

[0055] A pipe connector 300, comprising a pipe cap 310, a first ferrule joint 320 and a second ferrule joint 330; the pipe cap 310 has an internal thread, the first ferrule joint 320 and the second ferrule joint 330 are arranged inside the pipe cap 310, the first ferrule joint 320 abuts against the pipe cap 310, the second ferrule joint 330 abuts against the first ferrule joint 320, and the end surface of the second ferrule joint 330 close to one end of the thread is a third wedge surface 340;

[0056] The joint body 100 is connected to the end plug 200 to plug the pipeline; the joint body 100 is connected to the pipe connector 300 to connect the pipeline.

[0057] The connection portion 110 at one end of the connector body 100 has the same specifications as the connected process pipeline, and the threaded portion 120 at the other end of the connector body 100 is an external threaded connector adapted for sampling or purging pipelines, and the end of the external threaded connector is a smoothly processed wedge-shaped sealing surface, namely the first wedge-shaped surface 130.

[0058] The structure of the connector body 100 is compact and requires little space for installation. At the same time, its overall structural strength can meet the temperature and pressure requirements of the fluid medium in the pipe system connected thereto. The threaded portion 120 of the connector body 100 innovatively adopts a reduced diameter and wedge surface design, which cooperates with the wedge-shaped sealing surfaces of the end plug 200 and the pipe connector 300 to achieve the effect of using a smaller wall thickness to withstand the same pressure and excellent sealing performance.

[0059] The external interface of the end plug 200 is provided with an internal thread, and the interior of the end plug 200 is provided with a sealing portion 210 , and the sealing portion 210 has a smooth wedge-shaped sealing surface, that is, a second wedge-shaped surface 220 .

[0060] The internal thread of the end plug 200 matches the external thread of the joint body 100, and the hardness and finish of the second wedge surface 220 match the first wedge surface 130 of the joint body 100, so that effective sealing can be achieved without excessive tightening force. This structure can meet the structural strength requirements under high temperature and high pressure conditions, and the mechanical sealing surface can achieve leakage rate control requirements under high temperature and high pressure conditions.

[0061] The pipe connector 300 is composed of three parts, the outer part is a pipe cap 310 with internal threads, and the inner part includes a double ferrule joint, namely a first ferrule joint 320 and a second ferrule joint 330 .

[0062] The pipe connector 300 is connected to the end of the joint body 100 through a double ferrule, and the middle of the inside is a through hole for the pipe to pass through. The inner diameter of the through hole matches the inner diameter of the wedge surface end of the joint body 100, that is, the inner diameter of the threaded portion 120. The wedge surface finish of the front ferrule inside the pipe connector 300, that is, the wedge surface finish of the second ferrule joint 330, is consistent with the wedge surface finish of the joint body 100, so that when the pipe connector 300 is connected to the joint body 100, the front and rear ferrules can not only effectively clamp the middle pipe, but also form an effective seal on the wedge surface. Therefore, when performing sampling analysis, purging and draining, not only can the overall structural strength of the joint meet the requirements of the internal fluid medium, but also its sealing effect is excellent, sufficient to meet the leakage rate control requirements.

[0063] The present invention is applicable to a nuclear-grade sealing joint with quick-disassembly requirements, and the joint body 100 is connected with the end plug 200 to achieve plugging, and the pipeline is connected with the joint body 100 and the pipe connector 300.

[0064] When in use, the butt-welded end of the joint body 100, i.e., the connecting portion 110, is welded to the process pipeline. In a sealed state, the joint body 100 is connected to the end plug 200 by threads; when performing sampling analysis or purging and draining, the joint body 100 is connected to the external pipeline through the pipe connector 300 to achieve related functions.

[0065] In the sealed state, tighten the joint body 100 and the end seal 200, and the two achieve mechanical sealing through the smooth wedge-shaped sealing surface, that is, the first wedge surface 130 and the second wedge surface 220 are tightly fitted and sealed. This structure can meet the structural strength requirements under high temperature and high pressure conditions, and the mechanical sealing surface can achieve leakage rate control requirements under high temperature and high pressure conditions.

[0066] When performing sampling analysis or purging and draining, tightening the joint body 100 and the pipe connector 300, the double ferrule joint, that is, the first ferrule joint 320 and the second ferrule joint 330, can clamp the sampling or purging pipeline, and the wedge-shaped sealing surface of the front ferrule, that is, the third wedge-shaped surface 340, can also cooperate with the wedge-shaped sealing surface of the joint body 100, that is, the first wedge-shaped surface 130, to achieve the leakage rate control requirements. The structural strength of this part meets the requirements of the corresponding design pressure and design temperature.

[0067] The present invention is suitable for nuclear-grade sealing joints with quick-disassembly requirements, and can achieve sealing effects under high temperature, high pressure, high radiation dose and other working conditions. At the same time, it can be quickly disassembled and installed when sampling analysis or purging and drainage is required, and a good sealing effect can be achieved after installation and replacement.

[0068] like Figure 1a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-disconnection requirements of the present invention, the joint body 100 also includes a structural reinforcement portion 140 , and one end of the threaded portion 120 is connected to the connecting portion 110 via the structural reinforcement portion 140 .

[0069] The structural reinforcement part 140 is disposed between the threaded part 120 and the connecting part 110 to connect the threaded part 120 and the connecting part 110. The structural reinforcement part 140 plays a role in firmly connecting the front and rear ends of the joint body 100 and strengthening the overall rigidity.

[0070] like Figure 1a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-disassembly requirements of the present invention, the structural reinforcement portion 140 is an annular boss, and the inner annular surface 141 of the annular boss is an inclined surface.

[0071] The structural reinforcement portion 140 in the middle of the connector body 100 adopts an innovative structure of an annular boss, which not only serves to firmly connect the front and rear ends of the connector body 100 and enhance the overall rigidity, but also because the inner annular surface 141 of the annular boss is an inclined surface, the interior of the annular boss is designed as an expanded hole flow channel, which can ensure that the internal fluid medium can flow smoothly, reduce resistance loss and possible turbulence.

[0072] The butt-welded end of the joint body 100, namely the connecting portion 110, is welded to the process pipeline, and sufficient welding space is reserved between the butt-welded end and the structural reinforcement portion 140 in the middle of the joint body 100 to facilitate on-site welding.

[0073] As a preferred embodiment of the nuclear-grade sealing joint of the present invention suitable for quick-disassembly requirements, the end seal 200 is an integrated piece.

[0074] The end plug 200 is an integrally formed piece, which reduces weaknesses and defects caused by multiple processing and splicing, and has higher strength.

[0075] like Figure 1a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the inclination angle α of the first wedge surface 130 is complementary to the inclination angle β of the second wedge surface 220; the inclination angle α of the first wedge surface 130 is complementary to the inclination angle γ of the third wedge surface 340.

[0076] Since the inclination angles α and β are complementary, and the inclination angles α and γ are complementary, the first wedge surface 130 and the second wedge surface 220 , and the first wedge surface 130 and the third wedge surface 340 can fit tightly together.

[0077] Preferably, each wedge-shaped surface is locally hardened and smooth, and cooperates with the wedge-shaped sealing surfaces of the joint body 100, the end plug 200 and the pipe connector 300 to achieve the effect of using a smaller wall thickness to withstand the same pressure and excellent sealing performance.

[0078] The wedge surface finish of the front ferrule inside the pipe connector 300, that is, the second ferrule connector 330, is suitable for the wedge surface finish of the connector body 100, so that when the pipe connector 300 is connected to the connector body 100, the front and rear ferrules can not only effectively clamp the intermediate pipe, but also form an effective seal on the wedge surface. Therefore, when performing sampling analysis, purging and draining, not only can the overall structural strength of the connector meet the requirements of the internal fluid medium, but also its sealing effect is excellent, enough to meet the leakage rate control requirements.

[0079] like Figure 2a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the pipe cap 310 includes a first opening end 311 and a second opening end 312, the internal thread of the pipe cap 310 is arranged near the first opening end 311, and the second opening end 312 has an inner edge 313.

[0080] like Figure 2a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the first ferrule joint 320 abuts against the inner edge 313 .

[0081] like Figure 2a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the abutment portion of the first ferrule joint 320 and the second ferrule joint 330 is a wedge-shaped surface.

[0082] like Figure 2a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the inner edge 313 is perpendicular to the inner wall of the pipe cap 310; the cross-sectional shape of the first ferrule joint 320 is a right-angled L-shape with a slope at one end, and its right-angled side abuts against the inner edge 313; the cross-sectional shape of the second ferrule joint 330 is an obtuse triangle.

[0083] The slope surface at one end of the right-angled L-shaped first ferrule joint 320 and the slope surface formed by one of the sides forming the obtuse angle in the obtuse triangle second ferrule joint 330 abut against each other, thereby forming a wedge-shaped surface at the abutment between the first ferrule joint 320 and the second ferrule joint 330.

[0084] The pipe connector 300 is connected to the end of the joint body 100 through a double ferrule joint composed of a first ferrule joint 320 and a second ferrule joint 330. The middle of the pipe connector 300 is a through hole for the pipe to pass through. The inner diameter of the through hole matches the inner diameter of the wedge surface end of the joint body 100.

[0085] like Figure 2a to Figure 2b As shown, as a preferred embodiment of the nuclear-grade sealing joint suitable for quick-release requirements of the present invention, the surfaces of the first ferrule joint 320 and the second ferrule joint 330 are partially hardened.

[0086] The surfaces of the first ferrule joint 320 and the second ferrule joint 330 are partially hardened, and the finish of the third wedge surface 340 of the second ferrule joint 330 is suitable for the finish of the first wedge surface 130 of the joint body 100, so that when the pipe connector 300 is connected to the joint body 100, the first ferrule joint 320 and the second ferrule joint 330 can not only effectively clamp the intermediate pipe, but also form an effective seal on the wedge surface. Therefore, when performing sampling analysis, purging and draining, not only can the overall structural strength of the joint meet the requirements of the internal fluid medium, but also its sealing effect is excellent, enough to meet the leakage rate control requirements.

[0087] Preferably, all components of the present invention are made of metal and have good radiation resistance. The connection form adopted by the present invention meets the requirements of various standards and specifications for items of corresponding nuclear safety levels.

[0088] The innovative design of the nuclear-grade sealing joint suitable for quick-disassembly requirements of the present invention not only makes its structure compact and strong, but also makes it easier to disassemble and assemble than the traditional welded pipe cap 310, and lighter than the traditional test joint, which is conducive to the pipe system to withstand greater external loads. At the same time, its smaller end wall thickness bears the same pressure-bearing capacity, and the more convenient disassembly and assembly also greatly reduces the radiation dose of operation and maintenance personnel, and improves the safety and hygiene level of personnel.

[0089] The nuclear-grade sealing joint suitable for quick disassembly of the present invention is mainly composed of three parts, each of which is combined with the actual needs of sampling analysis or purging and draining in actual nuclear power plants and has corresponding structural functions. The joint body 100 can be connected to the process pipeline for sampling analysis or purging the pipeline, and the end plug 200 and the pipe connector 300 respectively realize the plugging and pipeline connection functions.

[0090] The joint body 100 and the end plug 200 are mechanically sealed by a wedge-shaped sealing surface, and a mechanical seal is achieved by a double ferrule and the joint body 100 during sampling and analysis and purging of the pipeline.

[0091] In summary, the present invention is applicable to nuclear-grade sealing joints with quick-disassembly requirements and has the following advantages:

[0092] 1. The sealing joint of the present invention has high structural strength, reliable connection, and a leakage rate that meets corresponding requirements, and is suitable for use in high temperature and high pressure environments.

[0093] 2. The sealing joint of the present invention is easy to disassemble and install. Compared with the threaded joint with sealing welding, it significantly reduces the operation time of personnel, thereby reducing the radiation dose of personnel in the irradiated environment.

[0094] 3. The sealing joint of the present invention is relatively simple in composition, significantly reduces the weight of components compared to pipes that require thread processing, is more friendly to mechanical calculation and analysis of the pipe system, and does not need to be thickened relative to the main process pipe, thereby reducing the number of pipe specifications used.

[0095] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A nuclear-grade sealing joint suitable for quick-disassembly requirements, characterized in that: The nuclear-grade sealing joint comprises: A connector body, the connector body comprising a connecting portion and a threaded portion connected in sequence; the connecting portion is used to connect to a pipe, the threaded portion has an external thread, one end of the threaded portion is connected to the connecting portion, and the other end of the threaded portion is a first wedge-shaped surface; An end plugging device, wherein the end plugging device has an internal thread, and the interior of the end plugging device has a sealing portion, and the end surface of the sealing portion close to one end of the thread is a second wedge-shaped surface; A pipe connector, the pipe connector comprising a pipe cap, a first ferrule joint and a second ferrule joint; the pipe cap has an internal thread, the first ferrule joint and the second ferrule joint are arranged inside the pipe cap, the first ferrule joint abuts against the pipe cap, the second ferrule joint abuts against the first ferrule joint, and the end surface of the second ferrule joint close to one end of the thread is a third wedge-shaped surface; The joint body is connected to the end head for blocking so as to block the pipeline; the joint body is connected to the pipe connector for connecting the pipeline.

2. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 1, characterized in that: The joint body further includes a structural reinforcement portion, and one end of the threaded portion is connected to the connecting portion through the structural reinforcement portion.

3. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 2, characterized in that: The structural reinforcement portion is an annular boss, and the inner annular surface of the annular boss is an inclined surface.

4. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 1, characterized in that: The end plugging is an integral piece.

5. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 1, characterized in that: The inclination angles of the first wedge surface and the second wedge surface are complementary; the inclination angles of the first wedge surface and the third wedge surface are complementary.

6. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 1, characterized in that: The tube cap comprises a first opening end and a second opening end, the internal thread of the tube cap is arranged close to the first opening end, and the second opening end has an inner edge.

7. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 6, characterized in that: The first ferrule joint abuts against the inner edge.

8. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 7, characterized in that: The abutment portion between the first ferrule joint and the second ferrule joint is a wedge-shaped surface.

9. The nuclear-grade sealing joint suitable for quick-release requirements as claimed in claim 8, characterized in that: The inner edge is perpendicular to the inner wall of the pipe cap; the cross-sectional shape of the first ferrule joint is a right-angled L-shape with a slope at one end, and its right-angled side abuts against the inner edge; the cross-sectional shape of the second ferrule joint is an obtuse triangle.

10. The nuclear-grade sealing joint suitable for quick-disassembly requirements as claimed in claim 1, characterized in that: The surfaces of the first ferrule joint and the second ferrule joint are locally hardened.

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