Cap-type leakproof sealing joint for clamping sleeve

Abstract

The utility model belongs to the technical field of sealing joints, and particularly relates to a clamping sleeve pipe cap type leakage-proof sealing joint which comprises a joint body, a clamping sleeve nut, a front clamping sleeve and a rear clamping sleeve. The rear clamping sleeve is located between the clamping sleeve nut and the connector body. The clamping sleeve nut is in threaded connection with the plug or the quick connector, the clamping sleeve nut abuts against the front clamping sleeve to the plug or the quick connector through the rear clamping sleeve, and the first wedge-shaped face is matched with the third wedge-shaped face in an inclined face mode, so that the front end of the front clamping sleeve deforms inwards in the radial direction and is clamped into the annular groove. According to the scheme, sealing and connection are achieved through the wedge-shaped faces, and the connector has the advantages of being high in connection strength, reliable in connection, low in leakage rate, convenient to disassemble and install and the like and is suitable for high-temperature and high-pressure use environments such as nuclear power plants; the joint body is not provided with threads, so that in special scenes such as radiation, the operation time of field personnel is remarkably shortened, and the exposure dose of the personnel in an irradiation environment is reduced; according to the scheme, all parts are high in replaceability, the parts are easier to manufacture, and the cost is lower.

Description

Technical Field

[0001] This utility model belongs to the field of sealing joint technology, specifically relating to a ferrule cap type leak-proof sealing joint. Background Technology

[0002] In specialized fields such as nuclear power engineering and high-pressure hydrogen environments, pipelines have high requirements for leak prevention and sealing. However, to ensure operational stability and reliability, it is often necessary to conduct a series of sampling analyses, drainage, and venting operations periodically. Therefore, leak-proof sealing joints are often installed at different nodes of nuclear power engineering pipelines and high-pressure hydrogen pipelines to facilitate the smooth operation of sampling analyses, drainage, and venting operations.

[0003] Because the media in nuclear power plant pipelines are radioactive and the media in high-pressure hydrogen pipelines are flammable, the requirements for leak-proof sealing joints are high. Currently, most systems use isolation valves with additional caps, plugs (1), quick couplings, etc., to improve leak-proof sealing performance. However, in piping systems of nuclear safety level 1, high-temperature and high-pressure nuclear safety levels 2 and 3, and non-nuclear piping systems, existing sealing joints are difficult to meet the requirements of relevant standards and specifications. Some quick-release joints have threads, and in order to ensure leak-proof sealing at the threads, special nuts are often required for connection, which increases the manufacturing cost of parts and also reduces the connection speed of sealing joints, affecting the efficiency of sampling analysis, drainage, and venting. Utility Model Content

[0004] To address the aforementioned problems in existing technologies, this solution provides a ferrule cap type leak-proof sealing joint.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A ferrule cap type leak-proof sealing joint includes a joint body, a ferrule nut, a front ferrule, and a rear ferrule;

[0007] The connector body is used to connect to an external plug or quick-connect fitting; the plug or quick-connect fitting has an external thread and a third wedge-shaped surface, the inner diameter of which increases progressively from front to back; the ferrule nut is fitted onto the front end of the connector body and has an internal thread that mates with the thread of the plug or quick-connect fitting; both the front and rear ferrules are annular and located between the ferrule nut and the connector body, with the front ferrule positioned in front of the rear ferrule; the front ferrule is conical and has a first wedge-shaped surface; an annular groove is provided at the front end of the connector body.

[0008] When the connector body is connected to the plug or quick connector, the ferrule nut is threaded to the plug or quick connector. The ferrule nut presses the front ferrule against the plug or quick connector. The first wedge surface and the third wedge surface are engaged, causing the front end of the front ferrule to deform radially inward and be inserted into the annular groove.

[0009] As an alternative or supplement to the above structure: a fourth wedge-shaped surface is provided at the inner edge of the rear end of the front sleeve, and a fifth wedge-shaped surface is provided at the outer edge of the front end of the rear sleeve; the fourth wedge-shaped surface can cooperate with the inclined surface of the fifth wedge-shaped surface to make the rear end of the front sleeve expand radially outward, and link with the front end of the front sleeve to make the front end of the front sleeve engage in the annular groove.

[0010] As an alternative or supplement to the above structure: the end face of the rear end of the ferrule forms a second wedge-shaped surface; the inner side of the rear end of the ferrule nut is provided with a stepped wedge-shaped surface, the inner diameter of which decreases continuously from front to back; the second wedge-shaped surface and the inclined surface of the stepped wedge-shaped surface cooperate to press the rear ferrule axially forward while also pressing the rear ferrule radially inward.

[0011] As an alternative or supplement to the above structure: the front side of the annular groove has a pressing surface, and the front end of the front sleeve is inserted into the annular groove and abuts against the pressing surface.

[0012] As an alternative or supplement to the above structure: the rear side of the annular groove has a wedge-shaped annular surface, and after the front end of the front sleeve is inserted into the annular groove, the inner wall of the front sleeve abuts against the wedge-shaped annular surface.

[0013] As an alternative or supplement to the above structure: the front end of the connector body is a plug-in end, the rear end of the connector body is a welding end, and a butt welding slope is provided at the outer edge of the welding end.

[0014] As an alternative or supplement to the above structure: the plug end and the welding end are separated by a convex ring.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. The leak-proof sealing joint in this solution achieves sealing and connection through a wedge-shaped surface, featuring high connection strength, reliable connection, and low leakage rate, making it suitable for high-temperature and high-pressure environments such as nuclear power plants;

[0017] 2. This solution features convenient disassembly and installation. Since the non-movable connector body does not have threads, but the threads are set on the flexible ferrule nut, the connection is more convenient. In special scenarios such as radiation, it can significantly reduce the operation time of on-site personnel and reduce the radiation dose to personnel in the irradiation environment.

[0018] 3. The components of the leak-proof sealing joint in this solution are simple to assemble and highly replaceable, and have the advantages of simpler parts manufacturing and lower cost. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this scheme or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0020] Figure 1 This is a diagram showing the connection status of the plug and the ferrule cap-type leak-proof sealing joint;

[0021] Figure 2 This is a cross-sectional view of the plug.

[0022] Figure 3 This is a cross-sectional view of the ferrule nut;

[0023] Figure 4 This is a cross-sectional view of the front ferrule;

[0024] Figure 5 This is a cross-sectional view of the rear ferrule;

[0025] Figure 6 This is a cross-sectional structural diagram of the connector body;

[0026] Figure 7 This is a diagram showing the connection status of the quick-connect coupling and the compression fitting cap-type leak-proof sealing joint;

[0027] Figure 8 This is a diagram showing the state of the quick-connect fitting before connection, specifically the ferrule cap type leak-proof sealing joint.

[0028] In the diagram: 1. Plug; 1-1. Third wedge face; 2. Compression nut; 2-1. Stepped wedge face; 3. Front compression sleeve; 3-1. First wedge face; 3-2. Fourth wedge face; 3-3. Front end face; 3-4. Inner ring face; 4. Rear compression sleeve; 4-1. Fifth wedge face; 4-2. Second wedge face; 5. Connector body; 5-1. Butt welding slope; 5-2. Clamping surface; 5-3. Wedge ring face; 5-4. Insertion end; 5-5. Welding end; 5-6. Annular groove; 6. Quick connector. Detailed Implementation

[0029] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this solution without creative effort are within the protection scope of this solution.

[0030] like Figures 1 to 8As shown, this embodiment designs a ferrule cap type leak-proof sealing joint, including a joint body 5, a ferrule nut 2, a front ferrule 3 and a rear ferrule 4.

[0031] The connector body 5 is used to connect the plug 1 or the quick-connect connector 6. When sampling analysis, drainage, venting, etc. are not performed, the connector body 5 is plugged into the plug 1; when sampling analysis, drainage, venting, etc. are required, the quick-connect connector 6 is plugged into the connector body 5.

[0032] An external thread and a third wedge-shaped surface 1-1 are provided on the plug 1 or quick-connect coupling 6. The third wedge-shaped surface 1-1 is located at the edge of the hole in the plug 1 or quick-connect coupling 6. The inner diameter of the third wedge-shaped surface 1-1 increases continuously from front to back (in this scheme, the description of the front and back direction here and later is based on the attached...). Figure 1 For reference only. Figure 1 (The left side in the diagram represents the front, and the right side represents the rear). The ferrule nut 2 is fitted onto the front end of the connector body 5. The ferrule nut 2 has a multi-step hole and an internal thread that mates with the plug 1 or quick connector 6. When the leak-proof sealing connector is connected to the plug 1 or quick connector 6, the ferrule nut 2 and the quick connector 6 are connected and fixed by the thread. The ferrule nut 2 only provides axial force and will not cause the entire pipeline to twist due to the rotation of the thread, thus affecting the assembly of other components.

[0033] Both the front retaining sleeve 3 and the rear retaining sleeve 4 are annular, located between the retaining nut 2 and the connector body 5. The front retaining sleeve 3 and the rear retaining sleeve 4 are fitted over the front end of the connector body 5, with the front retaining sleeve 3 positioned in front of the rear retaining sleeve 4. The front retaining sleeve 3 is conical, and its outer wall surface forms a first wedge-shaped surface 3-1, the diameter of which increases progressively from front to back. An annular groove 5-6 is provided at the front end of the connector body 5. The front retaining sleeve 3 and the rear retaining sleeve 4 can be made of metal or other hard materials.

[0034] When the connector body 5 is connected to the plug 1 or quick connector 6, the ferrule nut 2 is threadedly connected to the plug 1 or quick connector 6. The ferrule nut 2 and the ferrule 4 behind it press the front ferrule 3 against the plug 1 or quick connector 6. The first wedge surface 3-1 and the third wedge surface 1-1 are inclined to fit together, so that the front end of the front ferrule 3 is radially deformed inward and inserted into the annular groove 5-6.

[0035] The inner edge of the rear end of the front sleeve 3 is provided with a fourth wedge-shaped surface 3-2, and the outer edge of the front end of the rear sleeve 4 is provided with a fifth wedge-shaped surface 4-1. The fourth wedge-shaped surface 3-2 can cooperate with the inclined surface of the fifth wedge-shaped surface 4-1 to make the rear end of the front sleeve 3 expand radially outward, thereby lifting the rear end of the front sleeve 3, thereby linking the front end of the front sleeve 3 and making the front end of the front sleeve 3 engage in the annular groove 5-6.

[0036] The end face of the rear end of the ferrule 4 forms a second wedge surface 4-2; the inner side of the rear end of the ferrule nut 2 is provided with a stepped wedge surface 2-1, the inner diameter of the stepped wedge surface 2-1 continuously decreases from front to back; the second wedge surface 4-2 cooperates with the inclined surface of the stepped wedge surface 2-1, pressing the ferrule 4 radially inward while pressing it forward axially.

[0037] The annular groove 5-6 has a mating surface 5-2 on its front side. After the front end of the front sleeve 3 is inserted into the annular groove 5-6, the front end face 3-3 of the front sleeve 3 abuts against the mating surface 5-2. The annular groove 5-6 has a wedge-shaped annular surface 5-3 on its rear side. After the front end of the front sleeve 3 is inserted into the annular groove 5-6, the inner annular surface 3-4 of the front sleeve 3 abuts against the wedge-shaped annular surface 5-3. Through the sealing structure of the annular groove 5-6 and the front sleeve 3, the requirements of high temperature, high pressure and leakage prevention are met simultaneously, ensuring excellent sealing performance.

[0038] The front end of the connector body 5 is a plug end 5-4, and the rear end of the connector body 5 is a welding end 5-5. The plug end 5-4 and the welding end 5-5 are separated by a convex ring. A butt welding slope 5-1 is provided at the outer edge of the welding end 5-5 to facilitate welding the connector body 5 to the pipeline system. The butt welding slope 5-1 can reserve sufficient welding operation space to ensure the feasibility and convenience of welding.

[0039] The above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation; it is neither necessary nor possible to exhaustively list all possible implementations. However, obvious variations or modifications derived therefrom remain within the scope of this technology.

Claims

1. A leak-tight sealed joint of the ferrule cap type, characterized in that: It includes the connector body (5), the ferrule nut (2), the front ferrule (3) and the rear ferrule (4); The connector body (5) is used to connect to an external plug (1) or quick connector (6); the plug (1) or quick connector (6) is provided with an external thread and a third wedge surface (1-1), the inner diameter of the third wedge surface (1-1) increases continuously from front to back; the ferrule nut (2) is sleeved on the front end of the connector body (5) and has an internal thread that mates with the thread of the plug (1) or quick connector (6); the front ferrule (3) and the rear ferrule (4) are both annular and located between the ferrule nut (2) and the connector body (5), with the front ferrule (3) located in front of the rear ferrule (4); the front ferrule (3) is conical and has a first wedge surface (3-1); an annular groove (5-6) is provided at the front end of the connector body (5); When the connector body (5) is connected to the plug (1) or quick connector (6), the ferrule nut (2) is threadedly connected to the plug (1) or quick connector (6). The ferrule nut (2) and the ferrule (4) press the front ferrule (3) against the plug (1) or quick connector (6). The first wedge surface (3-1) and the third wedge surface (1-1) are engaged, so that the front end of the front ferrule (3) is radially deformed inward and inserted into the annular groove (5-6).

2. The push to connect leak resistant sealed joint of claim 1, wherein: The inner edge of the rear end of the front sleeve (3) is provided with a fourth wedge-shaped surface (3-2), and the outer edge of the front end of the rear sleeve (4) is provided with a fifth wedge-shaped surface (4-1). The fourth wedge-shaped surface (3-2) can cooperate with the inclined surface of the fifth wedge-shaped surface (4-1) to make the rear end of the front sleeve (3) expand radially outward and link with the front end of the front sleeve (3) so that the front end of the front sleeve (3) is inserted into the annular groove (5-6).

3. The push to connect, leak-tight sealed joint of claim 2, wherein: The end face of the rear end of the ferrule (4) forms a second wedge surface (4-2); the inner side of the rear end of the ferrule nut (2) is provided with a stepped wedge surface (2-1), the inner diameter of the stepped wedge surface (2-1) decreases continuously from front to back; the second wedge surface (4-2) and the stepped wedge surface (2-1) cooperate with each other, pressing the ferrule (4) axially forward while also pressing the ferrule (4) radially inward.

4. A push to connect fitting according to any one of claims 1 to 3, wherein: The front side of the annular groove (5-6) has a pressing surface (5-2). After the front end of the front sleeve (3) is inserted into the annular groove (5-6), it abuts against the pressing surface (5-2).

5. The ferrule-cannula cap type leak resistant sealed joint of claim 4, wherein: The rear side of the annular groove (5-6) has a wedge-shaped annular surface (5-3). After the front end of the front sleeve (3) is inserted into the annular groove (5-6), the inner wall of the front sleeve (3) abuts against the wedge-shaped annular surface (5-3).

6. The push-to-connect leak-tight sealed fitting of one of claims 1-3, wherein: The front end of the connector body (5) is a plug-in end (5-4), and the rear end of the connector body (5) is a welding end (5-5). A butt welding slope (5-1) is provided at the outer edge of the welding end (5-5).

7. The push to connect leak resistant sealed joint of claim 6, wherein: The plug end (5-4) and the welding end (5-5) are separated by a convex ring.

Images