Threaded joint for steel pipes

Abstract

The application discloses a threaded joint for a steel pipe and belongs to the threaded joint field. The threaded joint for the steel pipe comprises a joint body and a steel pipe body which is threadedly connected in the joint body, further comprises a locking sleeve which is symmetrically arranged on both sides of the joint body and sleeved on the steel pipe body, a sealing groove which is symmetrically arranged at both ends of the joint body, an extrusion ring which is symmetrically fixed on the locking sleeve and matched with the sealing groove, an airbag ring which is fixed in the sealing groove and matched with the extrusion ring, and a fixing assembly for fixing the joint body. The application effectively improves the sealing degree of the joint body and the steel pipe body and effectively improves the installation efficiency of the joint body and the steel pipe body.

Description

Technical Field

[0001] This invention relates to the field of threaded fittings technology, and more particularly to threaded fittings for steel pipes. Background Technology

[0002] In oil wells, natural gas wells, and other similar wells (hereinafter collectively referred to as "oil wells"), casing, pipes, and other tubing are used to extract underground resources. Oil well tubing is composed of steel pipes connected sequentially, with threaded fittings used for the connection. These steel pipes connected by threaded fittings are broadly classified into composite and integral types. In the composite type, one of the two pipes being connected is a steel pipe, and the other is a fitting. In this case, external threads are provided on the outer circumference of both ends of the steel pipe, and internal threads are provided on the inner circumference of both ends of the fitting. The external threads of the steel pipe are screwed into the internal threads of the fitting, thereby securing and connecting the two. In the integral type, both pipes being connected are steel pipes, without the use of additional fittings. In this case, external threads are provided on the outer circumference of one end of the steel pipe, and internal threads are provided on the inner circumference of the other end. The external threads of one steel pipe are screwed into the internal threads of the other steel pipe, thereby securing and connecting the two.

[0003] Currently, when threaded joints achieve a seal with steel pipes, a sealing ring is typically installed inside the threaded joint, and then the steel pipe is threaded into the threaded joint for sealing. However, the external threads of the steel pipe may cause severe wear to the sealing gasket during installation, which could affect the sealing effect between the threaded joint and the steel pipe. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a threaded joint for steel pipes; the threaded joint is used to seal the end and outer periphery of the steel pipe body, with good sealing effect, and the sealing ring and airbag ring do not contact the thread when installed, and the sealing ring and airbag ring will not be worn by the thread when they are compressed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A threaded connector for steel pipes includes: a connector body and a steel pipe body, wherein the steel pipe body is threadedly connected to the connector body; a locking sleeve symmetrically disposed on both sides of the connector body and fitted onto the steel pipe body; a sealing groove symmetrically formed at both ends of the connector body; a compression ring symmetrically fixed to the locking sleeve and matching the sealing groove; an air bladder ring fixed within the sealing groove and matching the compression ring; and a fixing assembly for fixing the connector body.

[0007] To facilitate fixing the connector body, preferably, the fixing component includes a fixing post fixed to the connector body, a connecting flange provided on the fixing post, a fixing flange provided on one side of the connecting flange, and the connecting flange and the fixing flange being fixedly connected by bolts.

[0008] To facilitate disassembly of the connector body, preferably, the connecting flange is threaded to the fixed column, and both the connecting flange and the fixed flange are provided with multiple threaded holes arranged in a circular pattern.

[0009] To facilitate the fixing of the locking sleeve, preferably, the two ends of the connector body are symmetrically provided with annular grooves, and the locking sleeve is fixedly connected with a snap ring that matches the annular groove, with one side of the snap ring being threadedly connected to the annular groove.

[0010] To improve the sealing between the locking sleeve and the connector body, preferably, a first sealing gasket matching the locking sleeve is fixedly connected to the connector body.

[0011] To facilitate the positioning of the steel pipe body, preferably, the two ends of the joint body are symmetrically provided with tapered openings.

[0012] To facilitate fixing to the connector body, preferably, a conical ring is fixedly connected to the locking sleeve, and the compression ring is fixed on the conical ring.

[0013] To improve the sealing between the locking sleeve and the connector body, preferably, a sealing ring is fixedly connected inside the conical opening, and a first gap is provided between the side of the conical opening near the sealing ring and the side of the conical ring.

[0014] To improve the fit between the airbag ring and the connector body, preferably, the connector body has multiple first sliding cavities circumferentially formed. A sealing rod slides within each first sliding cavity, and a pneumatic assembly fixed to the sealing rod is disposed inside the first sliding cavity. The pneumatic assembly is a piston body or a pressure plate, and an airbag is fixed to the bottom of the pressure plate. The airbag and the airbag ring are interconnected through a connecting pipe, or the sealed cavity formed by the first sliding cavity and the piston body is interconnected with the airbag ring through a connecting pipe. Multiple extrusion plates fixed to the sealing rod are fixed to the outside of the connector body. The extrusion plates have a sloping structure, and a conical groove is formed on the inner surface of the locking sleeve near the connector body. The conical groove fits into the extrusion plate.

[0015] To facilitate improved sealing of the two steel pipe bodies, preferably, a fixing ring is fixedly connected inside the joint body, and positioning rings are symmetrically fixedly connected to both ends of the fixing ring. A positioning groove matching the positioning ring is provided on the side of the steel pipe body near the fixing ring, and a second sealing gasket is fixedly connected to the fixing ring.

[0016] Compared with the prior art, the present invention provides a threaded joint for steel pipes, which has the following advantages:

[0017] 1. This threaded connector for steel pipes, by fixing the locking sleeve to the connector body, ensures that the sealing ring and airbag ring do not contact the threads during installation. When the sealing ring and airbag ring are compressed, they will not be worn by the threads. The sealing ring is squeezed and deformed by the conical ring and the connector body to fit with the threads of the steel pipe body. The extrusion ring enters the sealing groove to extrude the airbag ring, causing the airbag ring to deform and fit with the threads of the steel pipe body, thereby effectively improving the sealing degree between the connector body and the steel pipe body.

[0018] 2. The fixing ring of the joint body presses and seals the end of the steel pipe body, and the sealing ring and airbag ring of the joint body press and seal the outer wall of the steel pipe body, which can improve the sealing effect of the two steel pipe bodies.

[0019] 3. This threaded joint for steel pipes is installed and fixed by fixing the fixed flange to the wall, adjusting the distance between the joint body and the wall by rotating the connecting flange, and then installing and fixing the joint body by bolts and threaded holes. This effectively positions the joint body and facilitates disassembly and maintenance of the joint body.

[0020] 4. This threaded joint for steel pipes, by rotating the locking sleeve, makes the snap ring threaded into the annular groove, and the locking sleeve can effectively prevent the outer edge of the joint body from deforming, and the first sealing gasket effectively improves the sealing degree between the locking sleeve and the joint body.

[0021] 5. This threaded joint for steel pipes, with its tapered opening, facilitates the entry and positioning of the steel pipe body into the joint body, thereby effectively improving the installation efficiency of the joint body and the steel pipe body.

[0022] 6. This threaded joint for steel pipes uses a locking sleeve to press the pressing plate downwards, making it fit against the outside of the joint body. The pressing plate presses the sealing rod into the first sliding cavity. The gas in the first sliding cavity enters the airbag ring through the connecting pipe, causing the airbag ring to expand. This effectively improves the sealing between the steel pipe body and the joint body. At the same time, the reaction force of the sealing rod on the pressing plate effectively improves the fixing effect of the locking sleeve and effectively prevents the locking sleeve from loosening.

[0023] The parts of this device not covered herein are the same as or can be implemented using existing technologies. This invention effectively improves the sealing between the joint body and the steel pipe body, and also effectively improves the installation efficiency of the joint body and the steel pipe body. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the threaded joint for steel pipes proposed in this invention.

[0025] Figure 2 The threaded joint for steel pipes proposed in this invention Figure 1 Enlarged view of point A in the middle;

[0026] Figure 3 The threaded joint for steel pipes proposed in this invention Figure 1 Enlarged view of point B in the middle;

[0027] Figure 4 This is a cross-sectional schematic diagram of the connector body for a threaded joint used in steel pipes according to the present invention. Figure 1 ;

[0028] Figure 5 The threaded joint for steel pipes proposed in this invention Figure 4 Enlarged view of point C in the middle;

[0029] Figure 6 This is a cross-sectional schematic diagram of the connector body for a threaded joint used in steel pipes according to the present invention. Figure 2 ;

[0030] Figure 7 This is a cross-sectional schematic diagram of the locking sleeve for the threaded joint of steel pipe proposed in this invention.

[0031] Figure 8 The threaded joint for steel pipes proposed in this invention Figure 7 Enlarged view of point D in the middle;

[0032] Figure 9 This is a top view of the fixing flange for the threaded joint of steel pipe proposed in this invention.

[0033] Figure 10 This is a schematic diagram of the installation structure of the first sliding cavity, sealing rod and pneumatic assembly of the present invention.

[0034] Figure 11 This is a schematic diagram of the installation structure of another embodiment of the first sliding cavity, sealing rod and pneumatic assembly of the present invention.

[0035] In the diagram: 1. Connector body; 101. Annular groove; 102. Conical opening; 103. Sealing ring; 104. First sealing gasket; 105. Sealing groove; 106. Fixing ring; 107. Positioning ring; 108. Second sealing gasket; 2. Airbag ring; 201. Connecting pipe; 202. First sliding cavity; 203. Sealing rod; 204. Extrusion plate; 205. Pneumatic assembly; 2051. Piston body; 2052. Pressure plate; 2053. Airbag; 3. Locking sleeve; 301. Conical ring; 302. Extrusion ring; 303. Snap-fit ​​ring; 304. Conical groove; 305. First gap; 4. Fixing column; 401. Connecting flange; 402. Fixing flange; 403. Threaded hole; 404. Bolt; 5. Steel pipe body; 501. Positioning groove; A. Fixing ring plate. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Example 1: Refer to Figure 1 and Figure 2 A threaded connector for steel pipes includes: a connector body 1 and a steel pipe body 5, the steel pipe body 5 being threadedly connected to the connector body 1; a locking sleeve 3, symmetrically arranged on both sides of the connector body 1, and fitted onto the steel pipe body 5; a sealing groove 105, symmetrically formed at both ends of the connector body 1; a compression ring 302, symmetrically fixed on the locking sleeve 3, and matching the sealing groove 105; an airbag ring 2, fixed within the sealing groove 105, and matching the compression ring 302; and a fixing assembly for fixing the connector body 1.

[0038] When connecting the steel pipe body 5 and the connector body 1, first put the locking sleeve 3 on the steel pipe body 5, and then thread the connector body 1 onto the steel pipe body 5.

[0039] After the threaded connection between the connector body 1 and the steel pipe body 5 is completed, the locking sleeve 3 is fixed to the connector body 1. At this time, the extrusion ring 302 enters the sealing groove 105 to extrude the airbag ring 2, causing the airbag ring 2 to deform and fit into the thread of the steel pipe body 5, thereby effectively improving the sealing degree between the connector body 1 and the steel pipe body 5.

[0040] Example 2: Refer to Figure 1 , Figure 2 , Figure 6 and Figure 9A threaded connector for steel pipes includes: a connector body 1 and a steel pipe body 5, the steel pipe body 5 being threadedly connected to the connector body 1; a locking sleeve 3, symmetrically arranged on both sides of the connector body 1, and fitted onto the steel pipe body 5; a sealing groove 105, symmetrically formed at both ends of the connector body 1; a compression ring 302, symmetrically fixed on the locking sleeve 3, and matching the sealing groove 105; an airbag ring 2, fixed within the sealing groove 105, and matching the compression ring 302; and a fixing assembly for fixing the connector body 1.

[0041] The fixing component includes a fixing post 4 fixed on the connector body 1, a connecting flange 401 is provided on the fixing post 4, a fixing flange 402 is provided on one side of the connecting flange 401, and the connecting flange 401 and the fixing flange 402 are fixedly connected by bolts 404.

[0042] The connecting flange 401 is threaded to the fixed column 4, and both the connecting flange 401 and the fixed flange 402 are provided with multiple threaded holes 403 arranged in a circle.

[0043] When fixing the connected connector body 1, fix the fixing flange 402 to the wall, then adjust the distance between the connector body 1 and the wall by rotating the connecting flange 401, and then install and fix the connector body 1 by the bolt 404 and the threaded hole 403, thereby effectively positioning the connector body 1 and facilitating the disassembly and maintenance of the connector body 1.

[0044] Example 3: Reference Figure 1 , Figure 4 , Figure 5 , Figure 7 and Figure 8 A threaded connector for steel pipes includes: a connector body 1 and a steel pipe body 5, the steel pipe body 5 being threadedly connected to the connector body 1; a locking sleeve 3, symmetrically arranged on both sides of the connector body 1, and fitted onto the steel pipe body 5; a sealing groove 105, symmetrically formed at both ends of the connector body 1; a compression ring 302, symmetrically fixed on the locking sleeve 3, and matching the sealing groove 105; an airbag ring 2, fixed within the sealing groove 105, and matching the compression ring 302; and a fixing assembly for fixing the connector body 1.

[0045] The fixing component includes a fixing post 4 fixed on the connector body 1, a connecting flange 401 is provided on the fixing post 4, a fixing flange 402 is provided on one side of the connecting flange 401, and the connecting flange 401 and the fixing flange 402 are fixedly connected by bolts 404.

[0046] The connecting flange 401 is threaded to the fixed column 4, and both the connecting flange 401 and the fixed flange 402 are provided with multiple threaded holes 403 arranged in a circle.

[0047] The connector body 1 has symmetrical annular grooves 101 at both ends. The locking sleeve 3 is fixedly connected with a snap ring 303 that matches the annular groove 101. One side of the snap ring 303 is threadedly connected to the annular groove 101.

[0048] A first sealing gasket 104 that matches the locking sleeve 3 is fixedly connected to the connector body 1.

[0049] By rotating the locking sleeve 3, the snap ring 303 is threaded into the annular groove 101, and the locking sleeve 3 can effectively prevent the outer edge of the connector body 1 from deforming. The first sealing gasket 104 effectively improves the sealing degree between the locking sleeve 3 and the connector body 1.

[0050] Example 4: Reference Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 8 A threaded connector for steel pipes includes: a connector body 1 and a steel pipe body 5, the steel pipe body 5 being threadedly connected to the connector body 1; a locking sleeve 3, symmetrically arranged on both sides of the connector body 1, and fitted onto the steel pipe body 5; a sealing groove 105, symmetrically formed at both ends of the connector body 1; a compression ring 302, symmetrically fixed on the locking sleeve 3, and matching the sealing groove 105; an airbag ring 2, fixed within the sealing groove 105, and matching the compression ring 302; and a fixing assembly for fixing the connector body 1.

[0051] The fixing component includes a fixing post 4 fixed on the connector body 1, a connecting flange 401 is provided on the fixing post 4, a fixing flange 402 is provided on one side of the connecting flange 401, and the connecting flange 401 and the fixing flange 402 are fixedly connected by bolts 404.

[0052] The connecting flange 401 is threaded to the fixed column 4, and both the connecting flange 401 and the fixed flange 402 are provided with multiple threaded holes 403 arranged in a circle.

[0053] The connector body 1 has symmetrical annular grooves 101 at both ends. The locking sleeve 3 is fixedly connected with a snap ring 303 that matches the annular groove 101. One side of the snap ring 303 is threadedly connected to the annular groove 101.

[0054] A first sealing gasket 104 that matches the locking sleeve 3 is fixedly connected to the connector body 1.

[0055] The connector body 1 has tapered openings 102 symmetrically arranged at both ends.

[0056] A conical ring 301 is fixedly connected to the locking sleeve 3, and a compression ring 302 is fixed on the conical ring 301.

[0057] A sealing ring 103 is fixedly connected inside the conical opening 102, and a first gap 305 is provided between the side of the conical opening 102 near the sealing ring 103 and the side of the conical ring 301.

[0058] The tapered opening 102 facilitates the entry of the steel pipe body 5 into the joint body 1 for positioning, thereby effectively improving the installation efficiency of the joint body 1 and the steel pipe body 5.

[0059] When the locking sleeve 3 moves toward the connector body 1, the conical ring 301 squeezes the sealing ring 103, causing the sealing ring 103 to deform, thereby effectively improving the sealing degree between the connector body 1 and the locking sleeve 3.

[0060] Example 5: Refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8 , Figure 10 and Figure 11 A threaded connector for steel pipes includes: a connector body 1 and a steel pipe body 5, the steel pipe body 5 being threadedly connected to the connector body 1; a locking sleeve 3, symmetrically arranged on both sides of the connector body 1, and fitted onto the steel pipe body 5; a sealing groove 105, symmetrically formed at both ends of the connector body 1; a compression ring 302, symmetrically fixed on the locking sleeve 3, and matching the sealing groove 105; an airbag ring 2, fixed within the sealing groove 105, and matching the compression ring 302; and a fixing assembly for fixing the connector body 1.

[0061] The fixing component includes a fixing post 4 fixed on the connector body 1, a connecting flange 401 is provided on the fixing post 4, a fixing flange 402 is provided on one side of the connecting flange 401, and the connecting flange 401 and the fixing flange 402 are fixedly connected by bolts 404.

[0062] The connecting flange 401 is threaded to the fixed column 4, and both the connecting flange 401 and the fixed flange 402 are provided with multiple threaded holes 403 arranged in a circle.

[0063] The connector body 1 has symmetrical annular grooves 101 at both ends. The locking sleeve 3 is fixedly connected with a snap ring 303 that matches the annular groove 101. One side of the snap ring 303 is threadedly connected to the annular groove 101.

[0064] A first sealing gasket 104 that matches the locking sleeve 3 is fixedly connected to the connector body 1.

[0065] The connector body 1 has tapered openings 102 symmetrically arranged at both ends.

[0066] A conical ring 301 is fixedly connected to the locking sleeve 3, and a compression ring 302 is fixed on the conical ring 301.

[0067] A sealing ring 103 is fixedly connected inside the conical opening 102, and a first gap 305 is provided between the side of the conical opening 102 near the sealing ring 103 and the side of the conical ring 301.

[0068] The connector body 1 has multiple first sliding cavities 202 arranged in a circular pattern inside. A sealing rod 203 is slidably sealed inside the first sliding cavity 202. A spring is fixedly connected between the sealing rod and the bottom of the first sliding cavity. A pneumatic assembly 205 fixed to the sealing rod 203 is provided inside the first sliding cavity 202. The pneumatic assembly 205 is a piston body 2051 or a pressure plate 2052. An airbag 2053 is fixed to the bottom of the pressure plate 2052. The airbag 2053 and the airbag ring 2 are interconnected through a connecting pipe 201, or the sealed cavity formed by the first sliding cavity 202 and the piston body 2051 is interconnected with the airbag ring 2 through a connecting pipe 201. Multiple extrusion plates 204 fixed to the sealing rod 203 are fixed to the outside of the connector body 1. The extrusion plates 204 have a sloping structure. A conical groove 304 is opened on the inner surface of the locking sleeve 3 near the connector body 1. The conical groove 304 fits into the extrusion plate 204. During processing, multiple first sliding cavities 202 are first arranged circumferentially along the connector body 1, and the first sliding cavities 202 are arranged radially along the connector body 1; the outer side of the first sliding cavity 202 is embedded and sealed by welding a fixed ring plate A through a countersunk hole, and a sealing ring is fixed on the inner side of the fixed ring plate A. The sealing rod 203 moves through the sealing ring and the ring plate A to achieve a sealed movable setting of the sealing rod 203; after the ring plate A is embedded into the countersunk hole, the outer edge of the ring plate A and the inner edge of the countersunk hole can be sealed and welded together by overlay welding, so that the first sliding cavity 202 forms a piston cylinder and the sealing rod 203 forms a piston rod; the piston rod compresses the piston cylinder space, so that the air pressure of the airbag ring connected to the piston cylinder increases; the first sliding cavity 202 A connecting pipe 201 is provided between the sealing groove 105 and the sealing groove through a molding or direct opening method. The connecting pipe 201 is inserted into the inside of the perforation. One end of the connecting pipe 201 is connected to the sealing cavity by adhesive or bonded to the airbag 2053. The other end of the connecting pipe 201 is sealed to the airbag ring 2. One end of the connecting pipe 201 is integrally formed with the airbag ring 2, and the other end of the connecting pipe is inserted into the first sliding cavity 202 through the perforation. A soft tube is provided at the bottom of the airbag 2053. When a soft tube is used, a hard tube is inserted into the inside of the soft tube and the connecting pipe, and the soft tube, the connecting pipe and the hard tube are formed into one piece by a fully encapsulated curing adhesive. The cured connecting pipe section is embedded into the inside of the perforation.

[0069] A fixing ring 106 is fixedly connected inside the connector body 1. Positioning rings 107 are symmetrically fixedly connected to both ends of the fixing ring 106. A positioning groove 501 matching the positioning ring 107 is provided on the side of the steel pipe body 5 near the fixing ring 106. A second sealing gasket 108 is fixedly connected to the fixing ring 106.

[0070] During installation of the airbag ring 2, a portion of the gas inside the airbag ring 2 is introduced into the airbag 2053 or the sealed cavity formed by the first sliding cavity 202 and the piston body 2051 through the connecting pipe. This improves the convenience of installing the airbag ring 2 onto the connector body 1 and the steel pipe body 5. The gas inside the airbag ring 2 drives the sealing rod 203 to move the extrusion plate 204 outward. After the airbag ring is installed, the connector body 1 and the locking sleeve 3 are tightened. The process is as follows: the snap ring 303 is threaded onto the annular groove 101. During the threading, the locking sleeve 3 moves towards the connector body 1, and the conical groove 304 of the locking sleeve 3 presses against the extrusion plate 204. When the conical groove 304 continues to compress and squeeze... The pressure plate 204 compresses the sealing rod 203, causing it to move downwards. The pressure plate 204 compresses the sealing rod 203 and slides it into the first sliding cavity 202. The gas in the first sliding cavity 202 or the gas in the airbag 2053 enters the airbag ring 2 through the connecting pipe 201, causing the airbag ring 2 to expand. This effectively improves the sealing degree between the steel pipe body 5 and the joint body 1. At the same time, the air pressure causes the sealing rod 203 to exert a reaction force on the pressure plate 204. This reaction force pushes the pressure plate 204 upwards through the sealing rod 203, causing the pressure plate 204 to press against the locking sleeve 3. This effectively improves the fixing effect of the locking sleeve 3 and effectively prevents the locking sleeve 3 from loosening.

[0071] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A threaded connector for steel pipes, comprising a connector body (1) and a steel pipe body (5), wherein the steel pipe body (5) is threadedly connected within the connector body (1), characterized in that, Also includes; Locking sleeves (3) are symmetrically arranged on both sides of the connector body (1), and the locking sleeves (3) are sleeved on the steel pipe body (5); Sealing grooves (105) are symmetrically opened at both ends of the connector body (1); The compression ring (302) is symmetrically fixed on the locking sleeve (3), and the compression ring (302) matches the sealing groove (105); An airbag ring (2) is fixed in the sealing groove (105), and the airbag ring (2) is matched with the compression ring (302); A fixing component for fixing the connector body (1); The fixing assembly includes a fixing post (4) fixed on the connector body (1), a connecting flange (401) is provided on the fixing post (4), a fixing flange (402) is provided on one side of the connecting flange (401), and the connecting flange (401) and the fixing flange (402) are fixedly connected by bolts (404). The connecting flange (401) is threadedly connected to the fixed column (4), and both the connecting flange (401) and the fixed flange (402) are provided with a plurality of threaded holes (403) arranged in a circle. The connector body (1) has a plurality of first sliding cavities (202) arranged in a circular shape. A sealing rod (203) is slidably sealed in the first sliding cavity (202). A pneumatic assembly (205) fixed to the sealing rod (203) is provided inside the first sliding cavity (202). The pneumatic assembly (205) is a piston body (2051) or a pressure plate (2052). An air bag (2053) is fixed at the bottom of the pressure plate (2052). The airbag (2053) and the airbag ring (2) are connected to each other through the connecting pipe (201), or the sealed cavity formed by the first sliding cavity (202) and the piston body (2051) is connected to the airbag ring (2) through the connecting pipe (201); the connector body (1) is fixed with a plurality of extrusion plates (204) fixed to the sealing rod (203), the extrusion plate (204) is a slope structure, and the inner surface of the locking sleeve (3) is provided with a conical groove (304) on the side near the connector body (1); the conical groove (304) fits with the extrusion plate (204).

2. The threaded joint for steel pipes according to claim 1, characterized in that, The connector body (1) has symmetrical annular grooves (101) at both ends. The locking sleeve (3) is fixedly connected with a snap ring (303) that matches the annular groove (101). One side of the snap ring (303) is threadedly connected to the annular groove (101).

3. The threaded joint for steel pipes according to claim 1, characterized in that, The connector body (1) is fixedly connected with a first sealing gasket (104) that matches the locking sleeve (3).

4. The threaded joint for steel pipes according to claim 1, characterized in that, The connector body (1) has tapered openings (102) symmetrically arranged at both ends.

5. The threaded joint for steel pipes according to claim 4, characterized in that, A conical ring (301) is fixedly connected to the locking sleeve (3), and the compression ring (302) is fixed on the conical ring (301).

6. The threaded joint for steel pipes according to claim 4, characterized in that, A sealing ring (103) is fixedly connected inside the conical opening (102), and a first gap (305) is provided between the side of the conical opening (102) near the sealing ring (103) and the side of the conical ring (301).

7. The threaded joint for steel pipes according to claim 1, characterized in that, A fixing ring (106) is fixedly connected inside the connector body (1). Positioning rings (107) are symmetrically fixedly connected at both ends of the fixing ring (106). A positioning groove (501) matching the positioning ring (107) is provided on the side of the steel pipe body (5) near the fixing ring (106). A second sealing gasket (108) is fixedly connected on the fixing ring (106).

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