Threaded sleeve

Abstract

The invention relates to the technical field of sleeve sealing connection, in particular to a threaded sleeve which comprises a connecting pipe, a threaded female head and a threaded male head are arranged at the upper end and the lower end of the connecting pipe respectively, the threaded female head can be in threaded connection with the threaded male head, and an upper circular bead is arranged in the threaded female head. A lower circular bead matched with the upper circular bead is arranged outside the threaded male head, and an annular air bag is arranged above the upper circular bead. The casing pipe has the effects of improving the sealing performance and prolonging the service life of the casing pipe.

Description

Technical Field

[0001] The present application relates to the technical field of sleeve sealing connection, and in particular to a threaded sleeve. Background Art

[0002] As a common connector, threaded casing is widely used in oil extraction, natural gas transportation, construction and other fields. In these fields, threaded casing not only needs to have good sealing performance, but also needs to withstand the workload under harsh environmental conditions such as high pressure and high temperature. The performance of threaded casing directly affects the stability and safety of the entire system. Therefore, how to improve the connection reliability and service life of threaded casing has always been the focus of the industry.

[0003] In order to achieve reliable connection of threaded casing, the commonly used solutions include adding sealing rings to standard threaded connection. Specifically, standard threaded connection is achieved by screwing the threads together, but its sealing performance is poor; and although adding sealing rings can effectively improve the sealing performance, the sealing rings are prone to aging and failure during long-term use, resulting in an increased risk of leakage. Summary of the invention

[0004] In order to increase the sealing performance and service life of the casing, the present application provides a threaded casing.

[0005] This application provides a technical solution that adopts the following: A threaded casing comprises a connecting pipe, wherein the upper and lower ends of the connecting pipe are respectively provided with a threaded female head and a threaded male head, the threaded female head can be threadedly connected with the threaded male head, an upper shoulder is provided inside the threaded female head, a lower shoulder matching the upper shoulder is provided outside the threaded male head, and an annular air bag is provided above the upper shoulder.

[0006] By adopting the above technical solution, a female thread head and a male thread head are respectively arranged at the upper and lower ends of the connecting pipe, so that the quick connection and disassembly of the sleeve can be realized and the working efficiency is improved. An upper shoulder is arranged inside the female thread head, and a lower shoulder matching with the upper shoulder is arranged outside the male thread head. This structural design ensures the sealing of the connection part. The annular airbag can provide additional support and cushioning during connection and further improve the airtightness of the connection part after the connection is completed.

[0007] Optionally, the female thread head includes a first internal tapered thread, and the male thread head includes a first external tapered thread matching the first internal tapered thread.

[0008] By adopting the above technical solution, the interference fit of the inner and outer conical surfaces can be used to enhance the sealing, achieve a tighter connection, and improve the stability and reliability of the seal. At the same time, the design of the tapered thread helps to disperse stress and reduce local stress concentration, thereby extending the service life of the connector.

[0009] Optionally, the upper shoulder is arranged above the first internal tapered thread, and the lower shoulder is arranged above the first external tapered thread.

[0010] By adopting the above technical solution, when the threaded sleeve is connected, the upper shoulder and the lower shoulder can cooperate to achieve a more stable positioning and sealing effect, thereby improving the reliability and leak-proof performance of the connection. At the same time, this design can also effectively disperse the stress at the connection and extend the service life of the threaded sleeve.

[0011] Optionally, the threaded female head also includes a second internal tapered thread, which is arranged above the upper shoulder, and the minimum inner diameter of the second internal tapered thread is larger than the maximum inner diameter of the first internal tapered thread; the threaded male head also includes a second external tapered thread matching the second internal tapered thread.

[0012] By adopting the above technical solution, the female thread and the male thread of the threaded sleeve not only have the first internal cone thread and the first external cone thread, but also have the second internal cone thread and the second external cone thread. The second internal cone thread is arranged above the upper shoulder, and its minimum inner diameter is larger than the maximum inner diameter of the first internal cone thread, so that the threaded connection is tighter, and the reliability and sealing of the connection are improved. At the same time, the cooperation of the second internal cone thread and the second external cone thread further enhances the tensile strength and seismic resistance of the threaded sleeve, and effectively prevents leakage caused by loose connection due to vibration or external impact.

[0013] Optionally, the included angle between the inclination angles of the first inner conical thread, the second inner conical thread, the first outer conical thread and the second outer conical thread and the central axis of the connecting pipe is 2°-4°.

[0014] By adopting the above technical solution, the appropriate taper makes the threaded connection tighter and more reliable, improves the sealing of the connection, and effectively prevents the connection from loosening or leaking due to an angle that is too large or too small. At the same time, the design within this angle range can also ensure the feasibility of thread processing and avoid overly complex processing technology.

[0015] Optionally, the tooth profile cross-section of the first internal tapered thread and the second internal tapered thread is sawtooth-shaped, the angle between the top surface of the sawtooth and the radial cross-section of the connecting pipe is 20°-30°, and the angle between the bottom surface of the sawtooth and the radial cross-section of the connecting pipe is 2°-3°.

[0016] By adopting the above technical solution, the sawtooth tooth design of the internal tapered thread and the external tapered thread of the threaded casing significantly improves the self-locking performance and sealing performance of the threaded connection. The sawtooth top surface forms a large angle with the radial cross section of the connecting pipe, which increases the contact area of ​​the thread and enhances the stability of the connection. At the same time, the sawtooth bottom surface forms a small angle with the radial cross section of the connecting pipe, which improves the tensile strength and torsional strength of the connection, thereby improving the sealing performance and load-bearing capacity of the connecting pipe, ensuring stability and safety under various working conditions.

[0017] Optionally, the upper shoulder and the lower shoulder are both right-angle shoulders.

[0018] By adopting the above technical solution, since both the male thread and the female thread use tapered threads, the tapered threads need to be screwed into an interference fit state when they cooperate with each other, and the right-angle shoulder is not easy to deform under a certain over-torque, and has good over-torque resistance.

[0019] Optionally, the airbag is made of rubber.

[0020] By adopting the above technical solution, the airbag is made of rubber material, which makes the airbag have good elasticity and ductility, can effectively absorb vibration and impact during the connection process, and improve the stability and reliability of the connection. At the same time, the rubber airbag also has good corrosion resistance and wear resistance. After the connection is completed, the outer wall of the airbag can be closely attached to the connecting pipe by changing the internal pressure of the airbag, further improving the air tightness of the connection part.

[0021] Optionally, a plurality of pressurizing components are provided around the circumference of the connecting tube, and the pressurizing components include a support tube, which is integrally formed with the connecting tube and is connected to the interior of the airbag through an air gap, the diameter of the airbag is smaller than the diameter of the support tube, and a piston is slidably connected inside the support tube.

[0022] By adopting the above technical solution, when the piston moves in the support tube, the pressure in the airbag can be changed, and then the sealing performance and stability of the threaded sleeve can be improved by controlling the pressure of the airbag.

[0023] Optionally, an adjusting bolt is threadedly connected to the inner surface of the support tube, and the piston is fixedly connected to the adjusting bolt.

[0024] By adopting the above technical solution, the threaded connection between the adjusting bolt and the support tube and the fixed connection design between the piston and the adjusting bolt, the staff can easily adjust the position of the piston by rotating the adjusting bolt, thereby achieving control of the pressure in the airbag.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The threaded connection between the female thread head and the male thread head and the matching design of the upper shoulder, lower shoulder and airbag significantly improve the connection strength and sealing ability of the threaded casing, effectively improve the self-locking performance of the thread, prevent thread wear and loosening, and thus improve the reliability and service life of the connection; 2. The setting of internal and external tapered threads enables the female thread head and the male thread head to form a tighter fit when connected, improving the sealing performance. At the same time, it avoids the problem of aging and failure of traditional sealing rings, ensuring the sealing reliability of the threaded casing during long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the connection of the threaded sleeve provided in an embodiment of the present application.

[0027] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0028] Figure 3 yes Figure 1 A partial enlarged view of point B in the middle.

[0029] Explanation of the accompanying drawings: 1-male thread; 101-first outer tapered thread; 102-second outer tapered thread; 2-female thread; 201-first inner tapered thread; 202-second inner tapered thread; 203-top surface; 204-bottom surface; 3-radial section; 4-upper shoulder; 5-lower shoulder; 6-air bag; 7-support cylinder; 8-air gap; 9-piston; 10-adjusting bolt. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-3 This application is described in further detail.

[0031] An embodiment of the present application discloses a threaded casing.

[0032] like Figure 1 As shown, the threaded sleeve includes a connecting pipe, and the upper and lower ends of the connecting pipe are respectively provided with a threaded female head 2 and a threaded male head 1, the threaded female head 2 can be threadedly connected with the threaded male head 1, an upper shoulder 4 is provided inside the threaded female head 2, and a lower shoulder 5 matching the upper shoulder 4 is provided outside the threaded male head 1, and an annular airbag 6 is provided above the upper shoulder 4. The threaded female head 2 and the threaded male head 1 are respectively configured at the upper and lower ends of the connecting pipe, so that the sleeve can be quickly connected and disassembled, thereby improving the working efficiency. The threaded female head 2 is provided with an upper shoulder 4 inside, and the threaded male head 1 is provided with a matching lower shoulder 5 outside. This type of structural design ensures the sealing performance of the connection part. The annular airbag 6 provides additional support and buffering during the connection process, and further enhances the airtightness of the connection part after the connection is completed.

[0033] Specifically, the material diameter of the connecting pipe can be selected according to actual application requirements. For example, in oil production, the connecting pipe can be a polycarbonate pipe with a diameter of generally 100 mm to 200 mm.

[0034] like Figure 1 and Figure 2 As shown, the matching relationship between the female thread head 2 and the male thread head 1 is as follows: the female thread head 2 includes a first internal cone thread 201, and the male thread head 1 includes a first external cone thread 101 matched with the first internal cone thread 201. The first internal cone thread 201 on the female thread head 2 matches with the first external cone thread 101 on the male thread head 1 to form a preliminary sealing structure. The angle between the inclination angle of the first internal cone thread 201 and the first external cone thread 101 and the central axis of the connecting pipe is 2°-4°, which helps to improve the sealing and stability. The matching of the upper shoulder 4 above the first internal cone thread 201 and the lower shoulder 5 above the first external cone thread 101 makes the connection more secure and reduces the wear of the threaded part. The annular airbag 6 is compressed and expanded after the connection is completed, further enhancing the sealing effect.

[0035] like Figure 1 and Figure 2 As shown, the female thread head 2 also includes a second internal cone thread 202, which is arranged above the upper shoulder 4, and the minimum inner diameter of the second internal cone thread 202 is greater than the maximum inner diameter of the first internal cone thread 201. The second internal cone thread 202 can further improve the sealing and stability. The male thread head 1 also includes a second external cone thread 102 that matches the second internal cone thread 202. The angle between the inclination angle of the second internal cone thread 202 and the second external cone thread 102 and the central axis of the connecting pipe is 2°-4°, which also helps to improve the sealing and stability. The female thread head 2 and the male thread head 1 of the threaded sleeve not only have the first internal cone thread 201 and the first external cone thread 101, but also have the second internal cone thread 202 and the second external cone thread 102. The second internal cone thread 202 is arranged above the upper shoulder 4, and its minimum inner diameter is greater than the maximum inner diameter of the first internal cone thread 201, so that the threaded connection is tighter and the reliability and sealing of the connection are improved. At the same time, the cooperation between the second inner tapered thread 202 and the second outer tapered thread 102 further enhances the tensile strength and anti-vibration performance of the threaded sleeve, and effectively prevents leakage caused by loose connection due to vibration or external impact.

[0036] The total length of the female thread head 2 can be adjusted according to actual application requirements, and can be about 1.5 times the diameter of the connecting pipe. The length of the male thread head 1 can also be adjusted according to actual application requirements, and can be about 1.5 times the diameter of the connecting pipe.

[0037] like Figure 1 and Figure 2As shown, the first internal tapered thread 201 can be a sawtooth thread, the angle between the sawtooth top surface 203 and the radial section 3 of the connecting pipe is 20°-30°, and the angle between the sawtooth bottom surface 204 and the radial section 3 of the connecting pipe is 2°-3°. This sawtooth thread can provide a greater bite force during the connection process to prevent the thread from sliding. The second internal tapered thread 202 can also be a sawtooth thread, the angle between the sawtooth top surface 203 and the radial section 3 of the connecting pipe is 20°-30°, and the angle between the sawtooth bottom surface 204 and the radial section 3 of the connecting pipe is 2°-3°. The sawtooth tooth design of the internal tapered thread of the threaded sleeve and the matching external tapered thread significantly improve the self-locking performance and sealing performance of the threaded connection. The sawtooth top surface 203 forms a larger angle with the radial section 3 of the connecting pipe, which increases the contact area of ​​the thread and enhances the stability of the connection. At the same time, the serrated bottom surface 204 forms a smaller angle with the radial section 3 of the connecting pipe, which improves the tensile strength and torsional strength of the connection, thereby improving the sealing performance and bearing capacity of the connecting pipe and ensuring stability and safety under various working conditions.

[0038] The upper shoulder 4 and the lower shoulder 5 can be a right-angle shoulder or an angled shoulder. In this embodiment, the upper shoulder 4 and the lower shoulder 5 are both right-angle shoulders, which can provide better positioning and support. Since both the male thread head 1 and the female thread head 2 use tapered threads, the tapered threads need to be screwed to an interference fit state when they cooperate with each other, and the right-angle shoulder is not easy to deform under a certain over-torque, and has a good anti-torque ability. In addition, the surface of the upper shoulder 4 can be polished to reduce the friction coefficient, which is convenient for installation and can also extend the service life.

[0039] like Figure 1 and Figure 3 As shown, the annular airbag 6 is arranged above the upper shoulder 4 and can be made of rubber or other elastic materials. The thickness of the airbag 6 can be adjusted according to actual application requirements.

[0040] A plurality of pressurizing components are arranged around the circumference of the connecting tube, and the pressurizing components include a support tube 7, which is integrally formed with the connecting tube and communicates with the inside of the airbag 6 through an air slit 8 arranged in the connecting tube, and a piston 9 is slidably connected in the support tube 7. Before installing the piston 9, the inflation pressure of the airbag 6 can be adjusted by an external pump so that a certain initial pressure can be maintained in the airbag 6 after installing the piston 9. The function of the airbag 6 is to form a sealing layer that can closely fit the upper shoulder 4, the lower shoulder 5 and the inner wall of the connecting tube after the connection is completed to prevent liquid or gas leakage.

[0041] The function of the pressurizing component is to provide additional pressure during the connection process, so that the airbag 6 can better fit the upper shoulder 4, the lower shoulder 5 and the inner wall of the connecting pipe, further improving the sealing effect. The length of the support tube 7 can be adjusted according to the actual application requirements. The diameter of the airbag 6 is smaller than the diameter of the support tube 7, so as to ensure that the movement of the piston 9 can effectively change the pressure of the airbag 6.

[0042] In order to facilitate the adjustment of the piston 9, the support cylinder 7 is internally threaded with an adjusting bolt 10, and the piston 9 is fixedly connected to the adjusting bolt 10. The position of the piston 9 can be adjusted by rotating the adjusting bolt 10, thereby controlling the pressure of the airbag 6. The head of the adjusting bolt 10 can be provided with a straight, cross or hexagonal groove for easy manual adjustment.

[0043] The implementation principle of a threaded sleeve in the embodiment of the present application is as follows: through the multi-stage tapered thread design of the female thread head 2 and the male thread head 1, and the cooperation of the upper shoulder 4 and the lower shoulder 5, the high sealing and stability of the threaded sleeve are achieved. The design of the annular airbag 6 further improves the sealing effect and prevents liquid or gas leakage. The setting of the pressurized component enables the airbag 6 to better fit the connection surface, further improving the sealing performance. This threaded sleeve is particularly suitable for high-pressure environments, can effectively prevent thread wear and connection failure, and improve the stability and safety of the system.

[0044] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A threaded casing, characterized in that: include: A connecting pipe, wherein the upper and lower ends of the connecting pipe are respectively provided with a female thread head (2) and a male thread head (1), the female thread head (2) can be threadedly connected with the male thread head (1), an upper shoulder (4) is provided inside the female thread head (2), and a lower shoulder (5) matching with the upper shoulder (4) is provided outside the male thread head (1), and an annular air bag (6) is provided above the upper shoulder (4).

2. A threaded sleeve according to claim 1, characterized in that: The female thread head (2) comprises a first internal tapered thread (201), and the male thread head (1) comprises a first external tapered thread (101) matching the first internal tapered thread (201).

3. A threaded sleeve according to claim 2, characterized in that: The upper shoulder (4) is arranged above the first internal tapered thread (201), and the lower shoulder (5) is arranged above the first external tapered thread (101).

4. A threaded sleeve according to claim 3, characterized in that: The threaded female head (2) further comprises a second internal tapered thread (202), wherein the second internal tapered thread (202) is arranged above the upper shoulder (4), and the minimum inner diameter of the second internal tapered thread (202) is greater than the maximum inner diameter of the first internal tapered thread (201); the threaded male head (1) further comprises a second external tapered thread (102) matching the second internal tapered thread (202).

5. A threaded sleeve according to claim 4, characterized in that: The included angles of the inclination angles of the first inner tapered thread (201), the second inner tapered thread (202), the first outer tapered thread (101) and the second outer tapered thread (102) with the central axis of the connecting pipe are 2°-4°.

6. A threaded sleeve according to claim 4, characterized in that: The tooth profile cross-sections of the first internal tapered thread (201) and the second internal tapered thread (202) are sawtooth-shaped, the angle between the top surface (203) of the sawtooth and the radial cross-section (3) of the connecting pipe is 20°-30°, and the angle between the bottom surface (204) of the sawtooth and the radial cross-section (3) of the connecting pipe is 2°-3°.

7. A threaded casing according to claim 1, characterized in that: The upper shoulder (4) and the lower shoulder (5) are both right-angle shoulders.

8. A threaded casing according to claim 7, characterized in that: The airbag (6) is made of rubber.

9. A threaded casing according to claim 8, characterized in that: A plurality of pressurizing components are arranged around the circumference of the connecting tube, and the pressurizing components include a support tube (7). The support tube (7) is integrally formed with the connecting tube and is connected to the interior of the airbag (6) through an air gap (8). The diameter of the airbag (6) is smaller than the diameter of the support tube (7). A piston (9) is slidably connected inside the support tube (7).

10. A threaded casing according to claim 9, characterized in that: The support cylinder (7) is internally threadedly connected with an adjusting bolt (10), and the piston (9) is fixedly connected to the adjusting bolt (10).

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