Variable taper thread structure

Abstract

The utility model discloses a variable taper thread structure, which relates to the technical field of machining, and is characterized in that the variable taper thread structure comprises a male joint and a female joint, the male joint is sequentially provided with an auxiliary circular bead sealing surface B, a front section thread A, a middle section platform A, a rear section thread A and a main circular bead sealing surface A from a position far away from a screw cap, an auxiliary circular bead sealing face B, a rear-section thread B, a middle-section platform B, a front-section thread B and a main circular bead sealing face B are sequentially installed in the female connector, the front-section thread A is meshed with the front-section thread B, and the rear-section thread A is meshed with the rear-section thread B. The drill rod connector has the advantages that the problems that in the background technology, the torsional strength and the fatigue strength of the drill rod connector are reduced, and the service life of the drill rod connector is prolonged are solved. And risks of thread gluing, expansion of the female thread joint, breakage of the male thread joint and the like also exist.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical processing, and more specifically, to a variable-taper thread structure. Background Art

[0002] The variable taper thread structure is a thread structure with a tapered cross section. Its main feature is that the cross section shape is conical at the start and end of the thread, and cylindrical in the middle of the thread. This cross-sectional shape design can make the thread have better self-cleaning ability and sealing performance, and can also reduce the friction and wear of the connector. The variable taper thread has a wide range of applications, including petrochemical, aerospace, nuclear industry and other fields. In the petrochemical industry, the variable taper thread is usually used to connect high-pressure pipelines and containers to ensure their sealing performance and safety. In the aerospace and nuclear industries, the variable taper thread is used to connect high-temperature and high-pressure pipelines and containers to ensure the reliability and safety of its connection.

[0003] However, the current variable-taper thread greatly reduces the torsional strength and fatigue strength of the drill pipe joint, and there are also risks such as thread galling, swelling of the female thread joint and breakage of the male thread joint.

[0004] Therefore, in order to solve the above technical problems, the present application proposes a variable-taper thread structure. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model aims to provide a variable-taper thread structure.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a variable-taper thread structure, comprising: a male joint and a female joint, the male joint is provided with a secondary shoulder sealing surface B, a front thread A, a middle platform A, a rear thread A and a main shoulder sealing surface A in sequence from far away from the nut, and the female joint is provided with a secondary shoulder sealing surface B, a rear thread B, a middle platform B, a front thread B and a main shoulder sealing surface B in sequence;

[0007] The front thread A meshes with the front thread B, and the rear thread A meshes with the rear thread B. Preferably, the front thread A and the rear thread B adopt the same taper, the taper of the front thread A and the rear thread B is 1:6, the front thread A and the rear thread B adopt V038 tooth profile, the tooth height of the front thread A and the rear thread B is 3.095, and the pitch of the front thread A and the rear thread B is 6.35, so that the front thread A and the rear thread B can be accurately connected, and the tightness and reliability of the connection can be guaranteed.

[0008] Preferably, the rear thread A and the front thread B adopt the same taper, the taper of the rear thread A and the front thread B is 1:16, the rear thread A and the front thread B adopt V038 tooth type, the tooth height of the rear thread A and the front thread B is 3.095, and the pitch of the rear thread A and the front thread B is 6.35, which facilitates the precise connection between the rear thread A and the front thread B and can ensure the tightness and reliability of the connection.

[0009] Preferably, the dimensional tolerance range of the front thread A and the rear thread A is 0, -0.05mm, and the dimensional tolerance range of the rear thread B and the front thread B is 0, -0.05mm for the male connector, which is convenient for controlling manufacturing accuracy and interchangeability to ensure correct fit and installation.

[0010] Preferably, the main shoulder sealing surface B can be in close contact with the main shoulder sealing surface A, the middle platform A is slidably and rotatably inserted in the middle platform B, and is tightly connected with the middle platform B, and the auxiliary shoulder sealing surface A is slidably inserted in the auxiliary shoulder surface B, so as to provide better support and prevent the joint from loosening, and can ensure a tight fit during connection and provide better sealing performance.

[0011] Preferably, a nut is mounted on the male connector, and a groove is formed on the nut to facilitate inserting a tightening tool into the groove to tighten the male connector.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. In the utility model, the main shoulder sealing surface A on the male joint is in contact with the main shoulder sealing surface B on the female joint, and the auxiliary shoulder sealing surface A is in contact with the auxiliary shoulder sealing surface B, thereby solving the problem in the background technology that the torsional strength and fatigue strength of the drill pipe joint are reduced, and there are also risks of thread sticking, expansion of the female threaded joint and breakage of the male threaded joint.

[0014] 2. In the utility model, by meshing the front thread A with the rear thread B, overlapping the middle platform A with the middle platform B, and meshing the rear thread A with the front thread B, the number of thread teeth is reduced, the number of make-up circles is about 5 and a half circles, it can effectively withstand greater torque, longer service life, better sealing effect and significantly improve the make-up and make-off efficiency and production and processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of a cross-sectional view of a male connector in the utility model;

[0018] Figure 3 It is a structural schematic diagram of a cross-sectional view of the female connector in the present invention.

[0019] 1. Male connector; 2. Nut; 3. Groove; 4. Front thread A; 5. Middle platform A; 6. Rear thread A; 7. Main shoulder sealing surface A; 8. Auxiliary shoulder sealing surface A; 9. Female connector; 10. Auxiliary shoulder sealing surface B; 11. Rear thread B; 12. Middle platform B; 13. Front thread B; 14. Main shoulder sealing surface B. DETAILED DESCRIPTION

[0020] like Figure 1-3 As shown, the utility model provides a variable cone thread structure, including a male connector 1 and a female connector 9, on the male connector 1, starting from away from the nut 2, there are installed a secondary shoulder sealing surface B10, a front section thread A4, a middle section platform A5, a rear section thread A6 and a main shoulder sealing surface A7 in sequence, which is used to facilitate accurate connection, make the connection smoother and tighter, and provide better sealing performance; the female connector 9 is installed with a secondary shoulder sealing surface B10, a rear section thread B11, a middle section platform B12, a front section thread B13 and a main shoulder sealing surface B14 in sequence, the front section thread A4 is meshed with the front section thread B13, and the rear section thread A6 is meshed with the rear section thread B11, which is used to facilitate accurate connection, make the connection smoother and tighter, and provide better sealing performance.

[0021] The front thread A4 and the rear thread B11 use the same taper, and the taper of the front thread A4 and the rear thread B11 is 1:6. The front thread A4 and the rear thread B11 use V038 tooth profile, which is used to achieve precise connection and can ensure the tightness and reliability of the connection. The tooth height of the front thread A4 and the rear thread B11 is 3.095, and the pitch of the front thread A4 and the rear thread B11 is 6.35. The rear thread A6 and the front thread B13 use the same taper, and the taper of the rear thread A6 and the front thread B13 is 1:16. The rear thread A6 and the front thread B13 use V038 tooth profile, which is used to achieve precise connection and can ensure the tightness and reliability of the connection. The tooth height of the rear thread A6 and the front thread B13 is 3.095, and the pitch of the rear thread A6 and the front thread B13 is 6.35.

[0022] The dimensional tolerance range of the front thread A4 and the rear thread A6 is 0, -0.05mm, and the dimensional tolerance range of the rear thread B11 and the front thread B13 is 0, -0.05mm. The dimensional tolerance range of the male connector 1 is 0, -0.05mm, which is used to ensure the quality, precision and safety of the product.

[0023] The main shoulder sealing surface B14 can be in close contact with the main shoulder sealing surface A7, which is used to provide better sealing performance and reliability during connection. The middle platform A5 is slidably and rotatably inserted in the middle platform B12, and is closely connected with the middle platform B12, which is used to reduce the stress concentration and leakage risk at the connection part. The auxiliary shoulder sealing surface A8 is slidably inserted in the auxiliary shoulder surface B, which is used to provide better sealing performance and reliability during connection. The male connector 1 can be slidably inserted in the female connector 9, which is used to ensure that it can be completely slidably inserted. A nut 2 is installed on the male connector 1, and a groove 3 is provided on the nut 2 to facilitate tightening.

[0024] Working principle: When in use, first pick up the male connector 1, and then insert the male connector 1 into the female connector 9. When the secondary shoulder sealing surface A8 on the male connector 1 is inserted into the rear thread B11 opened on the female connector 9 and the front thread A4 on the male connector 1 is engaged with the rear thread B11 on the female connector 9, insert the gun head of the tightening gun into the groove 3 on the nut 2, and then turn on the tightening gun. When the tightening gun is started, the gun head will be driven to rotate, and the rotation of the gun head will drive the nut 2 to rotate. The rotation of the nut 2 will drive the male connector 1 to rotate in the female connector 9. The rotation of the male connector 1 will drive the front thread A4 to engage and rotate on the rear thread B11 in the female connector 9, and then the front thread A4 will rotate toward the secondary shoulder sealing surface B10, and at the same time, the middle platform A5 on the male connector 1 will be in the middle platform in the female connector 9. B12 rotates, and at the same time, the rear thread A6 on the male connector 1 will mesh with the front thread B13 on the female connector 9 and rotate. When the front thread A4 and the rear thread B11, the rear thread A6 and the front thread B13 mesh and overlap, and the thread buckle reaches a certain torque, the main shoulder sealing surface A7 contacts the main shoulder sealing surface B14, and the torque can be continued to increase so that the total length of the auxiliary shoulder sealing surface A8, the front thread A4, the middle platform A5 and the rear thread A6 on the male connector 1 compresses the total length of the auxiliary shoulder sealing surface B10, the rear thread B11, the middle platform B12 and the front thread B13 in the female connector 9, resulting in elastic deformation, and as the torque increases, the auxiliary shoulder sealing surface A8 will contact the auxiliary shoulder sealing surface B10. At this time, the torque value of the threaded connection reaches the designed torque value.

[0025] The above description is only a preferred embodiment of the utility model and does not limit the utility model in any form. Any ordinary technician in the industry can smoothly implement the utility model as shown in the drawings of the specification and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the utility model using the technical content disclosed above are all equivalent embodiments of the utility model. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the utility model are still within the protection scope of the technical solution of the utility model.

Claims

1. A variable taper thread structure, characterized in that: include: A male connector (1) and a female connector (9), wherein the male connector (1) is provided with a secondary shoulder sealing surface B (10), a front thread A (4), a middle platform A (5), a rear thread A (6) and a main shoulder sealing surface A (7) in sequence from the position away from the nut (2), and the female connector (9) is provided with a secondary shoulder sealing surface B (10), a rear thread B (11), a middle platform B (12), a front thread B (13) and a main shoulder sealing surface B (14) in sequence; The front thread A (4) is meshed with the front thread B (13), and the rear thread A (6) is meshed with the rear thread B (11).

2. A variable-taper thread structure according to claim 1, characterized in that: The front thread A (4) and the rear thread B (11) have the same taper, the taper of the front thread A (4) and the rear thread B (11) is 1:6, the front thread A (4) and the rear thread B (11) have a V038 tooth profile, the tooth height of the front thread A (4) and the rear thread B (11) is 3.095, and the pitch of the front thread A (4) and the rear thread B (11) is 6.

35.

3. A variable-taper thread structure according to claim 2, characterized in that: The rear thread A (6) and the front thread B (13) have the same taper, the taper of the rear thread A (6) and the front thread B (13) is 1:16, the rear thread A (6) and the front thread B (13) have a V038 tooth profile, the tooth height of the rear thread A (6) and the front thread B (13) is 3.095, and the pitch of the rear thread A (6) and the front thread B (13) is 6.

35.

4. A variable-taper thread structure according to claim 3, characterized in that: The dimensional tolerance range of the front thread A (4) and the rear thread A (6) is 0, -0.05mm, and the dimensional tolerance range of the rear thread B (11) and the front thread B (13) is 0, -0.05mm. The dimensional tolerance range of the male connector (1) is 0, -0.05mm.

5. A variable-taper thread structure according to claim 4, characterized in that: The main shoulder sealing surface B (14) can be in close contact with the main shoulder sealing surface A (7), the middle platform A (5) is slidably and rotatably inserted in the middle platform B (12) and is closely connected with the middle platform B (12), and the auxiliary shoulder sealing surface A (8) is slidably inserted in the auxiliary shoulder surface B.

6. A variable-taper thread structure according to claim 5, characterized in that: A nut (2) is installed on the male connector (1), and a groove (3) is formed on the nut (2).

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