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

Abstract

The invention relates to a pressure-measuring anti-falling pipe sealing joint and an anti-falling sealing method thereof.The pressure-measuring anti-falling pipe sealing joint comprises a main joint, an auxiliary joint and a pipe sealing assembly located in an inner cavity formed by the main joint and the auxiliary joint, and the pipe sealing assembly comprises a first sliding sleeve, a second sliding sleeve and a reducing jacket; the first sliding sleeve, the second sliding sleeve and the reducing clamping sleeve abut against one another when the main connector and the auxiliary connector are screwed and connected in a butt joint mode, the first sliding sleeve and a pipe fitting form preliminary sealing through an annular sealing ring, and the reducing clamping sleeve preliminarily clamps the pipe fitting. When gas and liquid are introduced into the main connector, gas-liquid pressure forms axial thrust on the pipe fitting in the pipe disengaging direction, the gas-liquid pressure pushes the first sliding sleeve, the second sliding sleeve and the variable-diameter clamping sleeve to further abut against one another, the corresponding annular sealing ring further deforms, the variable-diameter clamping sleeve further shrinks and clamps, and therefore the pipe fitting is separated from the pipe fitting. The cutting edge of the reducing jacket is matched with the axial thrust of the pipe fitting to form oblique cutting, an effective retaining and anti-falling structure is achieved, and the sealing performance and the retaining and anti-falling performance of the pipe fitting are improved in a self-adaptive mode along with the increase of the pressure in the pipe fitting.

Description

Technical Field

[0001] The invention relates to the field of pipe joints and is a pressure-measuring anti-detachment pipe sealing joint and an anti-detachment sealing method thereof. Background Art

[0002] A pipe fitting is a type of fitting used for butt joints between pipes or between pipes and equipment, and also functions as a butt seal. The more common pipe fittings on the market are quick fittings, which can be quickly sealed by manpower. They usually use threaded main fittings and auxiliary fittings. The main and auxiliary fittings are provided with annular or conical sealing rings inside. The main and auxiliary fittings are butt-jointed to tighten the sealing rings and the outer diameter of the pipe to form an effective seal. However, this type of quick fitting is often suitable for situations where the pressure inside the pipe is stable or not high. When the pressure of the pipe changes greatly or the pressure is high, it is often difficult to achieve reliable sealing and anti-slip performance of the pipe only by manual twisting. In order to solve the problem of anti-slipping of pipe fittings, such as the application publication number CN113217720A published in the Chinese patent literature, the application publication date is August 6, 2021, and the invention name is "A pneumatic steel pipe sealing structure for automobiles", which discloses the use of an outwardly protruding limit shoulder at one end of the ventilation pipe. The limit shoulder and the composite ferrule are clamped and limited between the two when the connecting fastener is connected to the pipe joint, thereby forming an effective anti-slipping sealing structure, but obviously, this kind of structural scheme is not suitable for straight pipe fittings without external protruding shoulders. For existing pipe fittings without external protruding limits, it is still difficult to have a better solution to achieve reliable sealing and anti-slipping under manual force, especially for the case of high pressure in the pipe, the sealing reliability and anti-slipping performance are even more difficult to guarantee. For this reason, the sealing performance and anti-slipping performance of the existing quick pipe sealing joints need to be improved. Summary of the invention

[0003] In order to overcome the above shortcomings, the purpose of the present invention is to provide a pressure measuring anti-detachment pipe sealing joint and an anti-detachment sealing method thereof to the art, so as to solve the technical problem that it is difficult to ensure the pipe connection sealing performance and anti-detachment performance under manual quick connection operation when the existing similar pressure measuring pipe joints are connected to high pressure working conditions. The purpose is achieved through the following technical solutions.

[0004] A pressure-measuring anti-drop pipe sealing joint, the sealing joint comprises a main joint and a secondary joint, one end of the main joint is provided with a gas-liquid inlet, the other end is provided with an external thread, and is threadedly connected with the internal thread at one end of the secondary joint, an inner cavity is formed inside the main joint and the secondary joint, a pipe clamp sealing assembly is provided in the inner cavity, and the other end of the secondary joint is a pipe interface; the structural key points are that the pipe sealing assembly comprises a first sleeve, a second sleeve, and a reducing sleeve arranged in sequence from the inner end of the inner cavity to the end of the secondary joint, the outer diameter of the first sleeve is slidably sealed with the inner cavity, the inner hole of the first sleeve forms a tapered hole, and the two ends of the tapered hole are respectively a small hole and a large hole, wherein the aperture of the small hole is larger than the outer diameter of the pipe to be sealed and connected, and a gap is provided between the end face of the small hole end of the first sleeve and the inner end of the gas-liquid inlet of the main joint; the second sleeve is provided with a small cylindrical section that slides with the large hole, and an annular sealing ring is provided in the large hole of the first sleeve in the initial state, when the small cylindrical section abuts against the annular sealing ring and enters the tapered hole, the annular sealing ring deforms to form a seal between the first sleeve and the outer diameter of the pipe, The second sleeve is provided with a large cylindrical section that is slidably matched with the inner cavity. One section of the inner hole of the second sleeve is a cylindrical hole corresponding to the small cylindrical section and having an outer diameter greater than the outer diameter of the pipe fitting. The other section is a tapered hole whose small hole end corresponds to the cylindrical hole. The reducing sleeve is provided between the second sleeve and the auxiliary joint. The reducing sleeve is provided with a reducing opening in the circumference. One section of the reducing sleeve is a tapered sleeve section that is matched with the tapered hole of the second sleeve. The tapered opening of the tapered sleeve section forms a cutting edge. When the tapered sleeve section cooperates with the tapered hole to form radial contraction, the cutting edge and the pipe fitting The reducer is clamped, and after clamping, when the pipe and the tapered mouth form a reverse axial thrust, the cutting edge of the tapered sleeve section and the outer diameter of the pipe form an oblique cutting force, that is, the pipe is axially stopped; the other section of the reducer is a tapered clamping section that cooperates with the tapered surface at the inner end of the auxiliary joint, and when the auxiliary joint and the main joint are threadedly locked, the tapered clamping section cooperates with the tapered surface in the auxiliary joint to form radial contraction and clamp the outer diameter of the pipe, and in this state, the annular sealing ring forms an initial seal between the first sleeve and the pipe.

[0005] Through the above structure, when the auxiliary joint is manually screwed to connect with the main joint, the axial clamping force between the main joint and the auxiliary joint is relied on to achieve the initial sealing of the annular sealing ring of the sealing joint on the pipe fitting, and the initial clamping of the pipe fitting by the reducing sleeve is achieved; when gas and liquid are introduced into the main joint, an axial thrust in the direction of pipe removal is formed on the pipe fitting, and relying on the gap between the first sleeve and the inner end of the inner cavity of the main joint, the gas-liquid pressure pushes the first sleeve, so that the pressing force between the first sleeve, the second sleeve and the reducing sleeve is increased, the corresponding annular sealing ring is further deformed, the reducing sleeve is further contracted and clamped, and the cutting edge of the reducing sleeve cooperates with the axial thrust of the pipe fitting to form an oblique cut, thereby realizing an effective anti-recession and anti-slip structure, and the sealing and anti-recession and anti-slip performance of the pipe fitting are adaptively improved as the pressure inside the pipe fitting increases.

[0006] The angle between the direction in which the cutting edge of the cone sleeve section cuts into the pipe fitting and the axial direction of the pipe fitting is 5° to 80°. With this structure, it is easier to realize that the cutting edge obliquely cuts into the pipe fitting to form a stop-retreat and anti-slip structure.

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

[0008] A reset spring is arranged between the large cylindrical section of the second sleeve and the large hole end of the first sleeve. With this structure, when the pipe connection state of the sealing pipe joint is released, the first sleeve, the second sleeve and the reducing sleeve are automatically reset, which facilitates the smooth removal of the pipe fitting.

[0009] The section where the large hole of the first sleeve is located and the small cylindrical section of the second sleeve are both provided with radially arranged strip sliding holes, and the peripheral surface of the main joint is fixed with a limit screw that slides with the strip sliding holes of the first sleeve and the second sleeve, that is, the limit screw forms a limit on the axial sliding of the first sleeve and the second sleeve relative to the inner cavity of the main joint. Through this structure, an effective stroke limit is formed for the sliding of the first sleeve and the second sleeve, preventing the first sleeve and the second sleeve from rotating relative to each other, protecting the seal, and when the auxiliary joint is separated from the main joint, the first sleeve and the second sleeve are not easy to fall out directly from the main joint.

[0010] The outer peripheral surface of the tapered clamping section of the reducing jacket is provided with an annular groove, and a clamping ring is integrated in the auxiliary joint to form an annular limit with the annular groove. Through this structure, the reducing jacket is not easy to be twisted and deformed when it is screwed and extruded with the auxiliary joint, and the reducing and shrinking is more reliable and stable.

[0011] The reducing opening of the reducing jacket is a strip-shaped opening, a part of the strip-shaped opening opens toward the conical end of the conical jacket section, and another part of the strip-shaped opening opens toward the end of the conical clamping section, and the two strip-shaped openings are alternately distributed. With this structure, the reducing jacket can change its diameter more stably.

[0012] The clamping opening of the tapered clamping opening section is toothed. With this structure, the reliability of clamping the tapered clamping opening section and the pipe fitting is improved.

[0013] The outer peripheral surface of the auxiliary joint is provided with a handle for assisting the auxiliary joint to rotate relative to the main joint, and the handle is hingedly connected to the auxiliary joint. Through this structure, it is convenient to manually apply force to operate the auxiliary joint to rotate.

[0014] The anti-slip sealing method of the pressure-measuring anti-slip pipe sealing joint is as follows: first, the pipe fitting is inserted along the pipe interface of the auxiliary joint and abutted against the inner end of the inner cavity of the main joint, and then the auxiliary joint is manually rotated relative to the main joint threaded connection to lock it. When 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 tapered hole of the first sliding sleeve to deform until the annular sealing ring forms an initial sealing state for the first sliding sleeve and the outer diameter of the pipe fitting. At the same time, the reducing sleeve forms an overall reducing contraction under the extrusion action of the tapered hole of the second sliding sleeve and the tapered surface of the auxiliary joint, and the cutting edge of the tapered sleeve section of the reducing sleeve forms an initial clamping state with the outer diameter of the pipe fitting under the guidance of the tapered hole, and the clamping of the tapered clamping section of the reducing sleeve forms a clamping and anti-slipping for the outer diameter of the pipe fitting; when the gas and liquid inlet of the main joint is When gas and liquid are introduced into the pipe fitting, an axial thrust in the opposite direction to the tapered mouth of the tapered sleeve section is formed on the pipe fitting, that is, a force in the direction of escaping the pipe connection, and the gas and liquid enter the gap in the inner cavity of the main joint, pushing the relative clamping force between the first sleeve and the second sleeve to increase, that is, the annular sealing ring is further deformed and contracted along the tapered hole of the first sleeve, and the sealing between the first sleeve and the outer diameter of the pipe fitting is enhanced. At the same time, the relative clamping force between the second sleeve and the reducing sleeve is increased, and the clamping force between the cutting edge of the tapered sleeve section of the reducing sleeve and the outer diameter of the pipe fitting is increased. While the clamping force increases, the cutting edge and the outer diameter of the pipe fitting form an oblique cut with the axial thrust of the pipe fitting, forming a stop-retreat and anti-slip state for the pipe fitting, and as the gas-liquid pressure continues to increase, the sealing and stop-retreat and anti-slip performance of the pressure measuring anti-slip pipe sealing joint and the pipe fitting increase synchronously.

[0015] The overall structure of the present invention is relatively compact, and quick pipe connection can be easily achieved by manpower. The sealing performance and anti-detachment performance after pipe connection are adaptively enhanced as the pressure inside the pipe increases. The present invention has better sealing performance and anti-detachment performance, and is suitable for use as a sealing joint for various pipes or pipelines, especially for use as a high-pressure pipe pressure measuring joint, or a structural improvement of similar sealing joints. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure, which shows the initial state of the pipe connection.

[0018] Figure 3 yes Figure 2 Schematic diagram of the structure when the rotating auxiliary joint is in place.

[0019] Figure 4 yes Figure 3Schematic diagram of the state structure when gas and liquid are introduced into the pipe after the middle joint is rotated into place. The non-solid arrows in the figure indicate the flow direction of gas and liquid. The framed part in the figure is enlarged, and the solid arrows in the enlarged figure indicate the relative movement direction of the cutting edge of the pipe fitting and the reducing jacket.

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

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

[0022] The serial numbers and names in the figure are: 1. main joint, 101. gas and liquid inlet, 102. gap, 2. auxiliary joint, 201. cone surface, 202. retaining ring, 3. pipe fitting, 4. handle, 5. first sleeve, 501. tapered hole, 6. sealing ring, 7. second sleeve, 701. small cylindrical section, 702. large cylindrical section, 703. cylindrical hole, 704. tapered hole, 8. annular sealing ring, 9. reset spring, 10. reducing sleeve, 1001. tapered sleeve section, 1002. tapered clamp section, 1003. cutting edge, 1004. annular groove, 1005. reducing mouth, 1006. clamp, 11. limit screw. DETAILED DESCRIPTION

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

[0024] like Figure 1-Figure 6As shown, the pressure measuring anti-detachment pipe sealing joint includes a main joint 1 and a sub-joint 2. A gas-liquid inlet 101 is provided at one end of the main joint 1, and an external thread is provided at the other end, and is threadedly connected to the internal thread at one end of the sub-joint 2. A cylindrical inner cavity is formed inside the main joint 1 and the sub-joint 2, and a pipe clamp sealing assembly is provided in the inner cavity. The other end of the sub-joint 2 is a pipe interface for inserting a pipe fitting 3 to be sealed. A handle 4 is provided on the outer peripheral surface of the sub-joint 2 for assisting the sub-joint 2 to rotate relative to the main joint 1, and the handle 4 is hingedly connected to the sub-joint 2, so that the handle 4 can be opened when in use and folded when not in use. The pipe fitting sealing assembly includes a first sleeve 5, a second sleeve 7, and a reducing sleeve 10 which are arranged in sequence from the inner end of the inner cavity to the end of the auxiliary joint 2. The outer diameter of the first sleeve 5 is provided with a sealing ring 6, and it is in sliding sealing cooperation with the inner cavity. The inner hole of the first sleeve 5 is provided with a tapered hole 501, and the two ends of the tapered hole 501 are respectively a small hole and a large hole, wherein the aperture 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 joint 1, and a gap 102 is provided between the two. The second sleeve 7 is provided with a small cylindrical section 701 which is slidably matched with the above-mentioned large hole. In the initial state, an annular sealing ring 8 is provided in the large hole of the first sleeve 5. When the small cylindrical section 701 abuts against the annular sealing ring 8 and enters the tapered hole 501, the annular sealing ring 8 deforms to form a seal between the first sleeve 5 and the outer diameter of the pipe 3; the second sleeve 7 is provided with a large cylindrical section 702 which is slidably matched with the inner cavity, and a reset spring 9 is abutted between the large cylindrical section 702 and the end of the large hole of the first sleeve 5; one section of the inner hole of the second sleeve 7 is a cylindrical hole 703 corresponding to the small cylindrical section 701 and having an outer diameter greater than the outer diameter of the pipe 3, and the other section is a tapered hole 704 corresponding to the cylindrical hole 703 at the small hole end, and the second sleeve 7 and the auxiliary joint 2, a reducing sleeve 10 is provided between the reducing sleeve 10, and reducing openings 1005 are evenly distributed in the circumferential direction of the reducing sleeve 10. One section of the reducing sleeve 10 is a tapered sleeve section 1001 that cooperates 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 cooperates with the tapered hole 704 to form radial contraction, the cutting edge is clamped with the pipe fitting, and after clamping, when the pipe fitting 3 and the tapered opening are directed to form a reverse axial thrust, the cutting edge 1003 of the tapered sleeve section 1001 and the outer diameter of the pipe fitting 3 form an oblique cutting force, that is, the pipe fitting 3 is axially stopped. The angle between the direction in which the cutting edge cuts 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. Another section of the reducer sleeve 10 is a tapered clamping section 1002 that cooperates with the tapered surface 201 in the auxiliary joint 2. When the auxiliary joint 2 and the main joint 1 are threadedly locked, the tapered clamping section 1002 cooperates with the tapered surface 201 at the inner end of the auxiliary joint 2, so that the clamping 1006 of the tapered clamping section 1002 forms radial contraction and clamps the outer diameter of the pipe fitting 3, and in this state, the annular sealing ring 8 forms an initial seal between the first sleeve 5 and the pipe fitting 3.

[0025] Furthermore, the section where the large hole of the above-mentioned first sleeve 5 is located and the small cylindrical section 701 of the second sleeve 7 are both provided with radially arranged strip sliding holes, and the circumferential surface of the main joint 1 is fixedly provided with a limit screw 11 that slides with the strip sliding holes of the first sleeve 5 and the second sleeve 7, that is, the limit screw 11 limits the axial sliding of the first sleeve 5 and the second sleeve 7 relative to the inner cavity of the main joint 1.

[0026] Furthermore, the outer peripheral surface of the conical clamping section 1002 of the above-mentioned reducing sleeve 10 is provided with an annular groove 1004, and a retaining ring 202 is integrated in the auxiliary joint 2 to form an annular limit with the annular groove 1004, so that when the auxiliary joint 2 rotates, the reducing sleeve 10 is not easy to be torsionally deformed, and the diameter change is more reliable and stable.

[0027] Furthermore, the reducing opening 1005 of the reducing sleeve 10 is a strip-shaped opening, a portion of which opens toward the tapered end of the tapered sleeve section 1001, and another portion of which opens toward the end of the tapered clamping section 1002, and the two portions of the strip openings are alternately distributed, thereby realizing reliable diameter changing operation of the reducing sleeve 10.

[0028] Furthermore, teeth are formed inside the clamping opening 1006 of the tapered clamping opening section 1002, so that it is more reliable when clamped with the pipe fitting 3.

[0029] In combination with the above structure, the anti-dropping sealing method of the pipe sealing joint connecting the pipe fitting is: first, Figure 2 As shown, the pipe fitting 3 is inserted along the pipe interface of the secondary joint 2 and abutted against the inner end of the inner cavity of the main joint 1; then, as shown in Figure 3 As shown, the handle 4 of the auxiliary joint 2 is rotated and unscrewed along the hinge, and the handle 4 is manually rotated to drive the auxiliary joint 2 to be threadedly locked relative to the main joint 1. When locking, the auxiliary joint 2 pushes the reducing sleeve 10, and the reducing sleeve 10 pushes the second sleeve 7. The second sleeve 7 pushes the annular sealing ring into the tapered hole 501 of the first sleeve 5 and deforms until the annular sealing ring forms an initial sealing state for the first sleeve 5 and the outer diameter of the pipe fitting 3. At the same time, the reducing sleeve 10 forms an overall reducing contraction under the extrusion of the tapered hole 704 of the second sleeve 7 and the tapered surface 201 of the auxiliary joint 2. The cutting edge 1003 of the tapered sleeve section 1001 of the reducing sleeve 10 forms an initial clamping with the outer diameter of the pipe fitting 3 under the guidance of the tapered hole 704, and the clamping mouth 1006 of the tapered clamping mouth section 1002 of the reducing sleeve 10 clamps the outer diameter of the pipe fitting 3 to prevent slipping. Figure 4As shown in the figure, when the gas-liquid inlet 101 of the main joint 1 is passed with gas and liquid and enters the pipe fitting 3, an axial thrust in the opposite direction to the tapered mouth of the tapered sleeve section 1001 is formed on the pipe fitting 3, that is, a force in the direction of escaping the pipe joint, and the gas and liquid enter the gap 102 in the inner cavity of the main joint 1, pushing the relative pressing force between the first sliding sleeve 5 and the second sliding sleeve 7 to increase, that is, the annular sealing ring 8 is further deformed and contracted along the tapered hole 501 of the first sliding sleeve 5, and the sealing between the first sliding sleeve 5 and the outer diameter of the pipe fitting 3 is enhanced. At the same time, the second sliding sleeve The relative tightening force between the sleeve 7 and the reducing sleeve 10 increases, and the clamping force between the cutting edge of the tapered sleeve section 1001 of the reducing sleeve 10 and the outer diameter of the pipe fitting 3 increases. While the clamping force increases, the cutting edge 1003 and the outer diameter of the pipe fitting 3 form an oblique cut in coordination with the axial thrust of the above-mentioned pipe fitting 3, forming a stop-retreat and anti-detachment state for the pipe fitting 3, and as the gas-liquid pressure continues to increase, the sealing and stop-retreat and anti-detachment performance of the pressure measuring anti-detachment pipe sealing joint and the pipe fitting 3 increase synchronously, effectively ensuring reliable sealing and anti-detachment performance after pipe connection.

[0030] The above is intended to illustrate the technical means of the present invention, not to limit the technical scope of the present invention. Those skilled in the art can make obvious improvements or substitutions to the present invention in combination with existing common knowledge, which also fall within the protection scope of the claims of the present invention.

Claims

1. A pressure-testing anti-drop 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), the other end being provided with an external thread, and being threadedly connected with an internal thread at 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 component, the other end of the secondary joint (2) being a pipe interface; characterized in that The pipe fitting sealing assembly comprises a first sliding sleeve (5), a second sliding sleeve (7), and a reducing sleeve (10) which are arranged in sequence along the inner end of the inner cavity to the end of the auxiliary joint (2); the outer diameter of the first sliding sleeve (5) is slidably sealed with the inner cavity; the inner hole of the first sliding sleeve (5) forms a tapered hole (501), and the two ends of the tapered hole (501) are respectively a small hole and a large hole, wherein the diameter of the small hole is larger than the outer diameter of the pipe fitting (3) to be sealed and connected; a gap (102) is provided between the end surface of the small hole of the first sliding sleeve (5) and the inner end of the gas-liquid inlet (101) of the main joint (1); the second sliding sleeve (7) is provided with a small hole which is slidably matched with the large hole; The first sleeve (5) has a cylindrical section (701), an annular sealing ring (8) is initially provided in the large hole of the first sleeve (5), when the small cylindrical section (701) abuts against the annular sealing ring (8) and enters the tapered hole (501), the annular sealing ring (8) deforms to form a seal between the first sleeve (5) and the outer diameter of the pipe (3), the second sleeve (7) has a large cylindrical section (702) that is slidably matched with the inner cavity, one section of the inner hole of the second sleeve (7) is a cylindrical hole (703) corresponding to the small cylindrical section (701) and having an outer diameter greater than the outer diameter of the pipe (3), and the other section is a cylindrical hole (703) corresponding to the small hole end ), the reducing sleeve (10) is provided between the second sleeve (7) and the auxiliary joint (2), the reducing sleeve (10) is provided with a reducing opening (1005) in the circumferential direction, a section of the reducing sleeve (10) is a tapered sleeve section (1001) that cooperates with the tapered hole (704) of the second sleeve (7), the tapered opening of the tapered sleeve section (1001) forms a cutting edge (1003), when the tapered sleeve section (1001) cooperates with the tapered hole (704) to form radial contraction, the cutting edge is clamped with the pipe fitting, and after clamping, when the pipe fitting (3) and the tapered opening form a reverse axial thrust, the tapered sleeve section (1003) is in a radially contracted state. The cutting edge (1003) of the reducing sleeve (10) forms an oblique cutting force with the outer diameter of the pipe (3), that is, the pipe (3) is axially stopped; the other section of the reducing sleeve (10) is a conical clamping section (1002) that cooperates with the conical surface (201) in the auxiliary joint (2), and when the auxiliary joint (2) and the main joint (1) are threadedly locked, the conical clamping section (1002) cooperates with the conical surface (201) at the inner end of the auxiliary joint (2) to form radial contraction and clamp the outer diameter of the pipe (3), and in this state, the annular sealing ring (8) forms an initial seal between the first sleeve (5) and the pipe (3).

2. The pressure-measuring anti-drop pipe sealing joint according to claim 1 is characterized in that The angle between the direction in which the cutting edge (1003) of the cone 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-measuring anti-detachment pipe sealing joint according to claim 1 is characterized in that The hardness of the reducing jacket (10) is greater than the hardness of the pipe (3).

4. The pressure-measuring anti-detachment pipe sealing joint according to claim 1 is 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-measuring anti-detachment pipe sealing joint according to claim 1 is characterized in that The section where the large hole of the first sliding sleeve (5) is located and the small cylindrical section (701) of the second sliding sleeve (7) are both provided with radially arranged strip sliding holes, and the peripheral surface of the main joint (1) is fixedly provided with a limit screw (11) that is slidably matched with the strip sliding holes of the first sliding sleeve (5) and the second sliding sleeve (7), that is, the limit 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 joint (1).

6. The pressure-measuring anti-detachment pipe sealing joint according to claim 1 is characterized in that An annular groove (1004) is provided on the outer peripheral surface of the tapered clamping section (1002) of the reducing jacket (10), and a clamping ring (202) is integrated in the auxiliary joint (2) and forms an annular limit with the annular groove (1004).

7. The pressure-measuring anti-detachment pipe sealing joint according to claim 1 is characterized in that The reducing opening (1005) of the reducing jacket (10) is a strip-shaped opening, one part of the strip-shaped opening opens toward the tapered end of the tapered jacket section (1001), and the other part of the strip-shaped opening opens toward the end of the tapered clamping section (1002), and the two parts of the strip-shaped openings are alternately distributed.

8. The pressure-measuring anti-detachment pipe sealing joint according to claim 1, characterized in that A tooth shape is formed inside the clamping mouth (1006) of the conical clamping mouth section (1002).

9. The pressure-measuring anti-detachment pipe sealing joint according to claim 1, characterized in that The outer peripheral surface of the auxiliary joint (2) is provided with a handle (4) for assisting the auxiliary joint (2) to rotate relative to the main joint (1), and the handle (4) is hingedly connected to the auxiliary joint (2).

10. An anti-detachment sealing method for a pressure-measuring anti-detachment pipe sealing joint as claimed in claim 1, characterized in that First, the pipe fitting (3) is inserted along the pipe interface of the auxiliary joint (2) and abutted against the inner end of the inner cavity of the main joint (1). Then, the auxiliary joint (2) is manually rotated to be threadedly connected and locked relative to the main joint (1). When locking, the auxiliary joint (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) contacts the first sliding sleeve (5) and the outer surface of the pipe fitting (3). At the same time, the reducing sleeve (10) forms an overall reducing and shrinking state under the extrusion action of the tapered hole (704) of the second sliding sleeve (7) and the tapered surface (201) of the auxiliary joint (2); the cutting edge (1003) of the tapered sleeve section (1001) of the reducing 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 mouth (1006) of the tapered clamping mouth section (1002) of the reducing sleeve (10) clamps and stops the outer diameter of the pipe fitting (3); when the air of the main joint (1) When gas and liquid are introduced into the liquid inlet (101) and enter the pipe fitting (3), an axial thrust in the opposite direction to the tapered opening of the tapered sleeve section (1001) is formed on the pipe fitting (3), i.e., a force in the direction of escaping the pipe joint. Moreover, gas and liquid enter the gap (102) in the inner cavity of the main joint (1), pushing the relative pressing force between the first sliding sleeve (5) and the second sliding sleeve (7) to increase, i.e., the annular sealing ring (8) is further deformed and contracted along the tapered hole (501) of the first sliding sleeve (5), and the sealing performance between the first sliding sleeve (5) and the outer diameter of the pipe fitting (3) is enhanced. At the same time, the relative pressing force between the second sliding sleeve (7) and the reducing sleeve (10) increases, and the clamping force between the cutting edge (1003) of the tapered sleeve section (1001) of the reducing sleeve (10) and the outer diameter of the pipe fitting (3) increases. While the clamping force increases, the cutting edge (1003) and the outer diameter of the pipe fitting (3) form an oblique cut in coordination with the axial thrust of the pipe fitting (3), thereby forming a stop-retract and anti-slip state for the pipe fitting (3). As the gas-liquid pressure continues to increase, the sealing properties and stop-retract and anti-slip performance of the pressure-measuring anti-slip pipe sealing joint and the pipe fitting (3) increase synchronously.

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