Pressure measuring anti-dropping pipe sealing joint and anti-dropping sealing method thereof

Abstract

The present application relates to a kind of pressure measuring anti-pulling pipe sealing joint and its anti-pulling sealing method, it includes main joint, secondary joint, and the pipe clamp sealing assembly in the inner cavity formed by main joint and secondary joint, pipe clamp sealing assembly includes first sliding sleeve, second sliding sleeve, variable-diameter clamp cover, first sliding sleeve, second sliding sleeve, variable-diameter clamp cover three are mutually abutted when main joint and secondary joint are screwed and connected, first sliding sleeve forms preliminary sealing with pipe by annular sealing ring, variable-diameter clamp cover forms preliminary clamping to pipe;When gas-liquid is introduced into main joint, axial thrust in the direction of pipe pulling off is formed to pipe by gas-liquid pressure, and first sliding sleeve, second sliding sleeve, variable-diameter clamp cover three are further mutually abutted by gas-liquid pressure, corresponding annular sealing ring is further deformed, variable-diameter clamp cover is further shrunk and clamped, and the blade of variable-diameter clamp cover cooperates with the axial thrust of pipe and forms oblique cutting, realizes effective anti-backout anti-pulling structure, and with the increase of the pressure in pipe, the sealing property and anti-backout anti-pulling performance of pipe are self-adaptively improved.

Description

Technical Field

[0001] This invention relates to the field of pipe fittings, specifically a pressure-testing anti-detachment pipe sealing fitting and its anti-detachment sealing method. Background Technology

[0002] Pipe fittings are connectors used to connect pipes to each other or between pipes and equipment, providing a seal. The most common type of pipe fitting on the market is the quick-connect fitting, which allows for rapid pipe connection and sealing manually. These typically use a threaded main connector and a secondary connector, both containing annular or conical sealing rings. The threads of the main and secondary connectors engage to compress the sealing rings against the outer diameter of the pipe, creating an effective seal. However, these quick-connect fittings are often suitable for situations where the internal pressure of the pipe is stable or low. When the pressure of the pipe fluctuates significantly or is high, it is often difficult to achieve a reliable seal and prevent detachment by relying solely on manual tightening. To address the issue of pipe fitting detachment, Chinese patent application CN113217720A, published on August 6, 2021, entitled "A Sealing Structure for Pneumatic Steel Pipes for Automobiles," discloses a method where a protruding limiting shoulder is provided at one end of the vent pipe. When the limiting shoulder and a composite ferrule are connected to the pipe joint via a fastener, they are clamped and limited between each other, forming an effective detachment-preventing sealing structure. However, this structure is clearly not suitable for straight pipe fittings without a protruding shoulder. For pipe fittings without a protruding limiting shoulder, existing solutions still struggle to achieve reliable sealing and detachment prevention under manual force, especially under high pressure conditions, where sealing reliability and detachment prevention performance are even more difficult to guarantee. Therefore, improvements to the sealing and detachment prevention performance of existing quick-connect pipe sealing joints are necessary. Summary of the Invention

[0003] To overcome the above-mentioned shortcomings, the purpose of this invention is to provide a pressure testing anti-detachment pipe sealing joint and its anti-detachment sealing method, thereby solving the technical problem that existing similar pressure testing pipe joints are difficult to guarantee the sealing performance and anti-detachment performance under high-pressure conditions during manual quick-connection operation. This objective is achieved through the following technical solution.

[0004] A pressure-measuring anti-detachment pipe sealing joint includes a main joint and a secondary joint. One end of the main joint has a gas-liquid inlet, and the other end has an external thread that connects to the internal thread of one end of the secondary joint. The main joint and the secondary joint form an inner cavity containing a pipe clamp sealing assembly. The other end of the secondary joint is a pipe interface. The key structural feature is that the pipe clamp sealing assembly includes a first sliding sleeve, a second sliding sleeve, and a reducing sleeve arranged sequentially along the inner end of the inner cavity to the end of the secondary joint. The outer diameter of the first sliding sleeve slides and seals against the inner cavity. The inner hole of the first sliding sleeve forms a conical hole with a small hole and a large hole at its two ends, respectively. The diameter of the small hole is larger than the outer diameter of the pipe to be sealed. A gap exists between the end face of the small hole of the first sliding sleeve and the inner end of the gas-liquid inlet of the main joint. The second sliding sleeve has a small cylindrical section that slides and engages with the large hole. Initially, the large hole of the first sliding sleeve contains an annular sealing ring. When the small cylindrical section abuts against the annular sealing ring and enters the conical hole, the annular sealing ring deforms to form a seal between the first sliding sleeve and the outer diameter of the pipe. The second sliding sleeve has a large cylindrical section that slides into the inner cavity. One section of the inner hole of the second sliding sleeve is a cylindrical hole corresponding to the small cylindrical section and having an outer diameter larger than the outer diameter of the pipe fitting. The other section is a tapered hole at the end of the small hole corresponding to the cylindrical hole. A reducing sleeve is provided between the second sliding sleeve and the auxiliary connector. The reducing sleeve has a reducing port circumferentially. One section of the reducing sleeve is a tapered sleeve section that mates with the tapered hole of the second sliding sleeve. The tapered opening of the tapered sleeve section forms a cutting edge. When the tapered sleeve section mates with the tapered hole to form a radial contraction, the cutting edge and the pipe fitting... When clamped, and after clamping, when the pipe fitting and the conical opening form a reverse axial thrust, the cutting edge of the conical sleeve section forms an oblique cutting force with the outer diameter of the pipe fitting, that is, the pipe fitting forms an axial anti-retraction state; the other section of the variable diameter jacket is a conical clamping section that mates with the conical surface of the inner end of the auxiliary connector. When the auxiliary connector is threadedly locked with the main connector, the conical clamping section mates with the conical surface inside the auxiliary connector to form radial contraction and clamp the outer diameter of the pipe fitting. In this state, the annular sealing ring forms an initial seal between the first sliding sleeve and the pipe fitting.

[0005] With the above structure, when the auxiliary joint is manually screwed into the main joint, the axial clamping force between the main joint and the auxiliary joint is used to achieve the initial sealing of the pipe fitting by the annular sealing ring of the sealing joint, and the initial clamping of the pipe fitting by the reducing jacket. When gas and liquid are introduced into the main joint, an axial thrust is formed on the pipe fitting in the direction of pipe detachment. Relying on the gap between the first sliding sleeve and the inner end of the main joint cavity, the gas and liquid pressure pushes the first sliding sleeve, which increases the mutual clamping force between the first sliding sleeve, the second sliding sleeve, and the reducing jacket. The corresponding annular sealing ring is further deformed, and the reducing jacket is further contracted and clamped. The cutting edge of the reducing jacket, in conjunction with the axial thrust of the pipe fitting, forms an oblique cut, thereby achieving an effective anti-retraction and anti-detachment structure. Moreover, as the pressure inside the pipe fitting increases, the sealing performance and anti-retraction and anti-detachment performance of the pipe fitting are adaptively improved.

[0006] The angle between the cutting edge of the tapered sleeve section and the pipe fitting axis is 5° to 80°. This structure makes it easier to achieve an oblique cutting edge into the pipe fitting to form an anti-reverse and anti-detachment structure.

[0007] The hardness of the reducing sleeve is greater than that of the pipe fitting. This structure ensures that the cutting edge of the reducing sleeve can effectively cut into the pipe fitting.

[0008] A return spring is provided between the large cylindrical section of the second sliding sleeve and the large orifice end of the first sliding sleeve. With this structure, when the pipe connection of the sealed pipe joint is released, the first sliding sleeve, the second sliding sleeve, and the reducing sleeve automatically reset, facilitating the smooth removal of the pipe fitting.

[0009] Both the large-hole section of the first sliding sleeve and the small cylindrical section of the second sliding sleeve are provided with radially arranged strip-shaped sliding holes. A limiting screw is fixedly provided on the circumferential surface of the main connector, which slides in conjunction with the strip-shaped sliding holes of the first and second sliding sleeves. That is, the limiting screw limits the axial sliding of the first and second sliding sleeves relative to the inner cavity of the main connector. This structure effectively limits the sliding stroke of the first and second sliding sleeves, preventing relative rotation and protecting the seals. Furthermore, when the auxiliary connector separates from the main connector, the first and second sliding sleeves are less likely to fall directly out of the main connector.

[0010] The outer circumferential surface of the tapered clamp section of the variable diameter jacket is provided with an annular groove, and a retaining ring that forms an annular limit with the annular groove is integrated inside the auxiliary connector. This structure prevents the variable diameter jacket from tortuous deformation when screwed and compressed by the auxiliary connector, making the diameter reduction more reliable and stable.

[0011] The variable diameter jacket has a strip-shaped opening, with one part of the strip opening facing the tapered end of the tapered sleeve section and the other part opening facing the end of the tapered clamping section. These two parts of the strip opening are alternately distributed. With this structure, the diameter change of the variable diameter jacket is relatively stable.

[0012] The tapered clamp section has teeth formed inside the clamp. This structure improves the reliability of clamping the tapered clamp section with the pipe fitting.

[0013] The outer circumferential surface of the auxiliary connector is provided with a handle that allows the auxiliary connector to rotate relative to the main connector, and the handle is hinged to the auxiliary connector. This structure facilitates manual operation to rotate the auxiliary connector.

[0014] The anti-detachment sealing method of the pressure testing anti-detachment pipe sealing joint is as follows: First, insert the pipe fitting along the pipe interface of the auxiliary joint and abut against the inner end of the main joint. Then, manually rotate the auxiliary joint relative to the threaded connection of the main joint to lock it. During locking, the auxiliary joint pushes the reducing sleeve, the reducing sleeve pushes the second sliding sleeve, and the second sliding sleeve pushes the annular sealing ring into the conical hole of the first sliding sleeve to deform until the annular sealing ring forms an initial sealing state between the first sliding sleeve and the outer diameter of the pipe fitting. At the same time, the reducing sleeve forms an overall reducing shrinkage under the extrusion action of the conical hole of the second sliding sleeve and the conical surface of the auxiliary joint. The cutting edge of the conical section of the reducing sleeve forms an initial clamping state with the outer diameter of the pipe fitting under the guidance of the conical hole. The clamping jaw of the conical jaw section of the reducing sleeve forms a clamping and anti-slip effect on the outer diameter of the pipe fitting. When the gas-liquid inlet of the main joint... When gas and liquid are introduced into the pipe fitting, an axial thrust is formed on the pipe fitting in the opposite direction to the conical opening of the conical sleeve section, i.e., a force that pulls the pipe fitting out of the connection direction. At the gap where the gas and liquid enter the inner cavity of the main connector, the relative clamping force between the first and second sliding sleeves increases, i.e., the annular sealing ring further deforms and contracts along the conical hole of the first sliding sleeve, enhancing the sealing between the first sliding sleeve and the outer diameter of the pipe fitting. At the same time, the relative clamping force between the second sliding sleeve and the variable diameter jacket increases, and the clamping force between the cutting edge of the conical sleeve section of the variable diameter jacket and the outer diameter of the pipe fitting increases. The increase in clamping force, combined with the axial thrust of the pipe fitting, causes the cutting edge to cut obliquely into the outer diameter of the pipe fitting, forming a non-retraction and non-detachment state for the pipe fitting. As the gas and liquid pressure continues to increase, the sealing performance and non-retraction and non-detachment performance of the pressure-measuring anti-detachment pipe sealing joint and the pipe fitting increase synchronously.

[0015] The invention has a relatively compact overall structure, and can be easily and quickly connected by manpower. The sealing performance and anti-detachment performance after connection are adaptively enhanced as the internal pressure of the pipe increases, resulting in better sealing and anti-detachment performance. It is suitable for use as a sealing joint for various pipe fittings or pipelines, especially for pressure testing joints of high-pressure pipe fittings, or for structural improvements of similar sealing joints. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0017] Figure 2 yes Figure 1 A cross-sectional view of the structure is shown in the figure, which represents the initial state of the pipe connection.

[0018] Figure 3 yes Figure 2 A schematic diagram of the rotating sub-joint in its final position.

[0019] Figure 4 yes Figure 3A schematic diagram of the structure after the intermediate and auxiliary joints are rotated into place and gas and liquid are introduced into the pipe. The non-solid arrows in the diagram indicate the direction of gas and liquid flow. The framed part in the diagram is enlarged, and the solid arrows in the enlarged diagram indicate the direction of relative movement between the cutting edge of the pipe fitting and the reducing sleeve.

[0020] Figure 5 yes Figure 2 Schematic diagram of the three-dimensional structure of the variable diameter jacket Figure 1 .

[0021] Figure 6 yes Figure 2 Schematic diagram of the three-dimensional structure of the variable diameter jacket Figure 2 .

[0022] The numbers and names in the diagram are as follows: 1. Main connector, 101. Gas-liquid inlet, 102. Gap, 2. Secondary connector, 201. Conical surface, 202. Snap ring, 3. Pipe fitting, 4. Handle, 5. First sliding sleeve, 501. Conical hole, 6. Sealing ring, 7. Second sliding sleeve, 701. Small cylindrical section, 702. Large cylindrical section, 703. Cylindrical hole, 704. Conical hole, 8. Annular sealing ring, 9. Return spring, 10. Variable diameter sleeve, 1001. Conical sleeve section, 1002. Conical clamp section, 1003. Cutting edge, 1004. Annular groove, 1005. Variable diameter port, 1006. Clamp, 11. Limit screw. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings.

[0024] like Figures 1-6As shown, the pressure testing and anti-detachment pipe sealing joint includes a main connector 1 and a secondary connector 2. One end of the main connector 1 is provided with a gas-liquid inlet 101, and the other end is provided with an external thread, which is threadedly connected to the internal thread of one end of the secondary connector 2. The main connector 1 and the secondary connector 2 form a cylindrical inner cavity, and a pipe clamp sealing assembly is provided in the inner cavity. The other end of the secondary connector 2 is a pipe interface for inserting the pipe fitting 3 to be sealed. The outer circumference of the secondary connector 2 is provided with a handle 4 that assists the secondary connector 2 to rotate relative to the main connector 1, and the handle 4 is hinged relative to the secondary connector 2, which makes it convenient to open the handle 4 when in use and fold it when not in use. The pipe clamp sealing assembly includes a first sliding sleeve 5, a second sliding sleeve 7, and a variable diameter jacket 10 arranged sequentially from the inner end of the inner cavity to the end of the auxiliary connector 2. The outer diameter of the first sliding sleeve 5 is provided with a sealing ring 6, which is in sliding sealing fit with the inner cavity. The inner hole of the first sliding sleeve 5 is provided with a tapered hole 501, with a small hole and a large hole at both ends of the tapered hole 501, wherein the diameter of the small hole is larger than the outer diameter of the pipe fitting 3 to be sealed and connected, and the end face of the small hole is opposite to the gas-liquid inlet 101 of the main connector 1, with a gap 102 between them. The second sliding sleeve 7 has a small cylindrical section 701 that slides with the aforementioned large hole. The large hole of the first sliding sleeve 5 initially contains an annular sealing ring 8. When the small cylindrical section 701 abuts against the annular sealing ring 8 and enters the conical hole 501, the annular sealing ring 8 deforms to form a seal between the first sliding sleeve 5 and the outer diameter of the pipe fitting 3. The second sliding sleeve 7 has a large cylindrical section 702 that slides with the inner cavity. A return spring 9 abuts against the end of the large cylindrical section 702 and the large hole of the first sliding sleeve 5. One section of the inner hole of the second sliding sleeve 7 is a cylindrical hole 703 corresponding to the small cylindrical section 701 and with an outer diameter larger than that of the pipe fitting 3. The other section is a conical hole 704 with the small hole end corresponding to the cylindrical hole 703. The second sliding sleeve 7 and the auxiliary connector... A reducing sleeve 10 is provided between the two parts. The reducing sleeve 10 has reducing openings 1005 evenly distributed around its circumference. One section of the reducing sleeve 10 is a tapered sleeve section 1001 that mates with the tapered hole 704 of the second sliding sleeve 7. The tapered opening of the tapered sleeve section 1001 forms a cutting edge 1003. When the tapered sleeve section 1001 mates with the tapered hole 704 to form radial contraction, the cutting edge clamps the pipe fitting. After clamping, when the pipe fitting 3 and the tapered opening form a reverse axial thrust, the cutting edge 1003 of the tapered sleeve section 1001 forms an oblique cutting force with the outer diameter of the pipe fitting 3, that is, the pipe fitting 3 forms a non-retractable state in the axial direction. The angle between the direction of the cutting edge cutting into the pipe fitting and the axial direction of the pipe fitting is 5° to 80°, and the hardness of the tapered sleeve section is greater than the hardness of the pipe fitting. The other section of the aforementioned reducing sleeve 10 is a tapered clamping section 1002 that mates with the tapered surface 201 inside the auxiliary connector 2. When the auxiliary connector 2 is threadedly locked with the main connector 1, the tapered clamping section 1002 mates with the tapered surface 201 at the inner end of the auxiliary connector 2, causing the clamping jaw 1006 of the tapered clamping section 1002 to form a radial contraction and clamp the outer diameter of the pipe fitting 3. In this state, the annular sealing ring 8 forms an initial seal between the first sliding sleeve 5 and the pipe fitting 3.

[0025] Furthermore, the section containing the large hole of the first sliding sleeve 5 and the small cylindrical section 701 of the second sliding sleeve 7 are both provided with radially arranged strip-shaped sliding holes. The circumferential surface of the main connector 1 is fixedly provided with a limiting screw 11 that slides and engages with the strip-shaped sliding holes of the first sliding sleeve 5 and the second sliding sleeve 7. That is, the limiting screw 11 limits the axial sliding of the first sliding sleeve 5 and the second sliding sleeve 7 relative to the inner cavity of the main connector 1.

[0026] Furthermore, the outer circumferential surface of the tapered clamp section 1002 of the aforementioned variable diameter sleeve 10 is provided with an annular groove 1004, and the auxiliary connector 2 is integrated with a retaining ring 202 that forms an annular limit with the annular groove 1004. Thus, when the auxiliary connector 2 rotates, the variable diameter sleeve 10 is not prone to torsional deformation, and the diameter change is more reliable and stable.

[0027] Furthermore, the variable diameter opening 1005 of the aforementioned variable diameter jacket 10 is a strip-shaped opening. Part of the strip-shaped opening opens towards the conical end of the conical sleeve section 1001, and another part of the strip-shaped opening opens towards the end of the conical clamping section 1002. The two parts of the strip-shaped opening are alternately distributed to realize the reliable diameter change operation of the variable diameter jacket 10.

[0028] Furthermore, the clamp 1006 of the tapered clamp section 1002 is formed with teeth to make it more reliable when clamped with the pipe fitting 3.

[0029] Based on the above structure, the anti-detachment sealing method for the pipe sealing joint connection fitting is as follows: First, as... Figure 2 As shown, insert pipe fitting 3 along the pipe interface of auxiliary connector 2 and abut it against the inner end of the main connector 1; then, as... Figure 3 As shown, the handle 4 of the auxiliary connector 2 is rotated out along the hinge. Manually rotating the handle 4 causes the auxiliary connector 2 to be threadedly locked relative to the main connector 1. During locking, the auxiliary connector 2 pushes the reducing sleeve 10, the reducing sleeve 10 pushes the second sliding sleeve 7, and the second sliding sleeve 7 pushes the annular sealing ring into the tapered hole 501 of the first sliding sleeve 5, causing deformation until the annular sealing ring forms an initial seal between the first sliding sleeve 5 and the outer diameter of the pipe fitting 3. At the same time, the reducing sleeve 10 forms an overall reducing shrinkage under the squeezing action of the tapered hole 704 of the second sliding sleeve 7 and the tapered surface 201 of the auxiliary connector 2. The cutting edge 1003 of the tapered sleeve section 1001 of the reducing sleeve 10 forms an initial clamp with the outer diameter of the pipe fitting 3 under the guidance of the tapered hole 704. The clamp 1006 of the tapered clamp section 1002 of the reducing sleeve 10 forms a clamping and anti-slip effect on the outer diameter of the pipe fitting 3. Figure 4As shown, when gas and liquid are introduced into the gas-liquid inlet 101 of the main connector 1 and enter the pipe fitting 3, an axial thrust is formed on the pipe fitting 3 in the opposite direction to the cone opening of the tapered sleeve section 1001, i.e., a force that disengages the pipe fitting. Furthermore, at the gap 102 where the gas and liquid enter the inner cavity of the main connector 1, the relative clamping force between the first sliding sleeve 5 and the second sliding sleeve 7 increases. This causes the annular sealing ring 8 to further deform and shrink along the tapered hole 501 of the first sliding sleeve 5, enhancing the sealing between the first sliding sleeve 5 and the outer diameter of the pipe fitting 3. Simultaneously, the second sliding sleeve... The relative clamping force between sleeve 7 and reducing sleeve 10 increases, and the clamping force between the cutting edge of the tapered sleeve section 1001 of reducing sleeve 10 and the outer diameter of pipe fitting 3 increases. At the same time as the clamping force increases, in conjunction with the axial thrust of the aforementioned pipe fitting 3, the cutting edge 1003 and the outer diameter of pipe fitting 3 form an oblique cut, forming a non-retraction and anti-detachment state for pipe fitting 3. As the gas and liquid pressure continues to increase, the sealing performance of the pressure measuring anti-detachment pipe sealing joint and the anti-retraction and anti-detachment performance of pipe fitting 3 increase synchronously, effectively ensuring reliable sealing and anti-detachment performance after pipe connection.

[0030] The above description is intended to illustrate the technical means of the present invention and is not intended to limit the scope of the invention. Any obvious improvements or substitutions made to the present invention by those skilled in the art based on existing common knowledge also fall within the protection scope of the claims of the present invention.

Claims

1. A pressure testing anti-detachment pipe sealing joint, the sealing joint comprising a main joint (1) and a secondary joint (2), one end of the main joint (1) being provided with a gas-liquid inlet (101), and the other end being provided with an external thread, which is threadedly connected to the internal thread of one end of the secondary joint (2), the main joint (1) and the secondary joint (2) forming an inner cavity, the inner cavity being provided with a pipe clamp sealing assembly, and the other end of the secondary joint (2) being a pipe interface; characterized in that The pipe clamp sealing assembly includes a first sliding sleeve (5), a second sliding sleeve (7), and a variable diameter jacket (10) arranged sequentially from the inner end of the inner cavity to the end of the auxiliary connector (2). The outer diameter of the first sliding sleeve (5) slides and seals with the inner cavity. The inner hole of the first sliding sleeve (5) forms a conical hole (501), and the two ends of the conical hole (501) are a small hole and a large hole, respectively. The diameter of the small hole is larger than the outer diameter of the pipe fitting (3) to be sealed. A gap (102) is provided between the end face of the small hole of the first sliding sleeve (5) and the inner end of the gas-liquid inlet (101) of the main connector (1). The second sliding sleeve (7) is provided with a small section that slides and fits with the large hole. The cylindrical section (701) has an annular sealing ring (8) in the initial state of the large hole of the first sliding sleeve (5). When the small cylindrical section (701) abuts against the annular sealing ring (8) and enters the conical hole (501), the annular sealing ring (8) deforms to form a seal between the outer diameter of the first sliding sleeve (5) and the outer diameter of the pipe fitting (3). The second sliding sleeve (7) has a large cylindrical section (702) that slides with the inner cavity. One part of the inner hole of the second sliding sleeve (7) is a cylindrical hole (703) corresponding to the small cylindrical section (701) and with an outer diameter larger than that of the pipe fitting (3). The other part is a small hole end corresponding to the cylindrical hole (703). The tapered hole (704) of the second sliding sleeve (7) and the auxiliary connector (2) are provided with the variable diameter sleeve (10). The variable diameter sleeve (10) is provided with a variable diameter opening (1005) in the circumferential direction. One section of the variable diameter sleeve (10) is a tapered sleeve section (1001) that mates with the tapered hole (704) of the second sliding sleeve (7). The tapered opening of the tapered sleeve section (1001) forms a cutting edge (1003). When the tapered sleeve section (1001) mates with the tapered hole (704) to form a radial contraction, the cutting edge clamps the pipe fitting. After clamping, when the pipe fitting (3) and the tapered opening form a reverse axial thrust, the tapered sleeve section (1003) clamps the pipe fitting. The cutting edge (1003) of 01) forms an oblique cutting force with the outer diameter of the pipe fitting (3), that is, the pipe fitting (3) forms a non-retracting state in the axial direction; the other part of the variable diameter sleeve (10) is a tapered clamping section (1002) that cooperates with the tapered surface (201) inside the sub-connector (2). When the sub-connector (2) is threadedly locked with the main connector (1), the tapered clamping section (1002) cooperates with the tapered surface (201) at the inner end of the sub-connector (2) to form a radial contraction and clamp the outer diameter of the pipe fitting (3). In this state, the annular sealing ring (8) forms an initial seal between the first sliding sleeve (5) and the pipe fitting (3).

2. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... The angle between the direction in which the cutting edge (1003) of the tapered sleeve section (1001) cuts into the pipe fitting (3) and the axial direction of the pipe fitting (3) is 5° to 80°.

3. The pressure testing anti-detachment tube sealing joint according to claim 1, characterized in that... The hardness of the variable diameter jacket (10) is greater than that of the pipe fitting (3).

4. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... A return spring (9) is provided between the large cylindrical section (702) of the second sliding sleeve (7) and the large hole end of the first sliding sleeve (5).

5. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... Both the large hole section of the first sliding sleeve (5) and the small cylindrical section (701) of the second sliding sleeve (7) are provided with radially arranged strip-shaped sliding holes. The circumferential surface of the main connector (1) is fixedly provided with a limiting screw (11) that slides and engages with the strip-shaped sliding holes of the first sliding sleeve (5) and the second sliding sleeve (7). That is, the limiting screw (11) limits the axial sliding of the first sliding sleeve (5) and the second sliding sleeve (7) relative to the inner cavity of the main connector (1).

6. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... The tapered clamp section (1002) of the variable diameter jacket (10) has an annular groove (1004) on its outer circumferential surface, and the sub-connector (2) is integrated with a retaining ring (202) that forms an annular limit with the annular groove (1004).

7. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... The variable diameter opening (1005) of the variable diameter sleeve (10) is a strip-shaped opening. Part of the strip-shaped opening opens toward the conical end of the conical sleeve section (1001), and another part of the strip-shaped opening opens toward the end of the conical clamp section (1002). The two parts of the strip-shaped opening are alternately distributed.

8. The pressure testing anti-detachment sealing joint according to claim 1, characterized in that... The tapered clamping section (1002) has teeth formed inside the clamping section (1006).

9. The pressure testing anti-detachment tube sealing joint according to claim 1, characterized in that... The outer circumferential surface of the sub-connector (2) is provided with a handle (4) that allows the auxiliary sub-connector (2) to rotate relative to the main connector (1), and the handle (4) is hinged relative to the sub-connector (2).

10. A method for preventing detachment of the pressure testing anti-detachment pipe sealing joint as described in claim 1, characterized in that... First, insert the pipe fitting (3) along the pipe interface of the auxiliary connector (2) and abut it against the inner end of the main connector (1). Then, manually rotate the auxiliary connector (2) to lock it relative to the main connector (1) through the threaded connection. When locking, the auxiliary connector (2) pushes the reducing sleeve (10), the reducing sleeve (10) pushes the second sliding sleeve (7), and the second sliding sleeve (7) pushes the annular sealing ring (8) into the tapered hole (501) of the first sliding sleeve (5) to deform until the annular sealing ring (8) deforms against the first sliding sleeve (5) and the outer surface of the pipe fitting (3). The diameter forms an initial sealing state. At the same time, the variable diameter sleeve (10) forms an overall diameter reduction under the squeezing action of the tapered hole (704) of the second sliding sleeve (7) and the tapered surface (201) of the auxiliary connector (2). The cutting edge (1003) of the tapered sleeve section (1001) of the variable diameter sleeve (10) forms an initial clamping state with the outer diameter of the pipe fitting (3) under the guidance of the tapered hole (704). The clamping jaw (1006) of the tapered clamping section (1002) of the variable diameter sleeve (10) forms a clamping and anti-slip effect on the outer diameter of the pipe fitting (3). When the gas of the main connector (1) is... When gas and liquid are introduced into the liquid inlet (101) and enter the fitting (3), an axial thrust is formed on the fitting (3) in the opposite direction to the cone opening of the cone sleeve section (1001), i.e., a force that disengages the pipe connection. Furthermore, the gas and liquid enter the gap (102) inside the main connector (1), pushing the first sliding sleeve (5) and the second sliding sleeve (7) to increase their relative clamping force. This causes the annular sealing ring (8) to further deform and shrink along the cone hole (501) of the first sliding sleeve (5), enhancing the sealing between the first sliding sleeve (5) and the outer diameter of the fitting (3). At the same time, the relative clamping force between the second sliding sleeve (7) and the variable diameter jacket (10) increases, and the clamping force between the cutting edge (1003) of the tapered sleeve section (1001) of the variable diameter jacket (10) and the outer diameter of the pipe fitting (3) increases. While the clamping force increases, it is combined with the axial thrust of the pipe fitting (3). The cutting edge (1003) and the outer diameter of the pipe fitting (3) form an oblique cut, which forms a non-retraction and anti-detachment state for the pipe fitting (3). As the gas and liquid pressure continues to increase, the sealing performance of the pressure measuring anti-detachment pipe sealing joint and the pipe fitting (3) increases synchronously.

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