An ultra-short type nipple joint based on pin cooperation

Abstract

The utility model relates to petroleum logging device, in order to solve the problem that the joint of existing nipple connecting structure is longer, poor stability, high maintenance cost, and propose a kind of ultra-short nipple joint based on pin cooperation, including upper nipple lower interface, plug assembly, lower nipple upper interface and socket assembly;Plug assembly includes plug mounting seat and multiple plug pins, and the connecting end surface of plug mounting seat is provided with plug key along the axial direction;Socket assembly includes socket mounting seat and multiple sockets;The circumferential surface of socket mounting seat is provided with the lower semicircle key groove that is compatible with plug key along the axial direction;The position corresponding with lower semicircle key groove on the inner wall of lower nipple upper interface is provided with the upper semicircle key groove that is compatible with plug key, and plug key is connected in the key groove formed by lower semicircle key groove and upper semicircle key groove;The rear end of socket mounting seat is fixedly connected with sliding support, and the sliding end of sliding support is sleeved on the guide rod in lower nipple upper interface, and the boss that slides along upper semicircle key groove is arranged on sliding support.

Description

Technical Field

[0001] This utility model relates to oil well logging equipment, specifically to an ultra-short joint based on pin-and-pin fitting. Background Technology

[0002] The connection structure between the short sections of an oil logging instrument is a component used to fix, connect, or transmit power between two short sections. Its core function is to ensure the stability, sealing, and functionality of the connection.

[0003] Currently, common short-section connection structures mainly include the following forms: ① Threaded connection: The connection is achieved through the meshing of internal and external threads. It is suitable for small and medium diameter or low pressure scenarios. However, due to its long connection structure, its resistance to vibration and impact is weak, and it is prone to instability of the overall structure under long-term alternating loads; ② Flange connection: Flanges are welded or fixed at the ends of the two short sections and then bolted to secure the flanges. It is suitable for high-pressure and large-diameter scenarios such as pipelines and pressure vessels. However, it occupies a large space, has poor versatility, and is prone to corrosion and jamming; ③ Welded connection: The connection parts of the short sections are fused together at high temperature to form a permanent connection. It has high sealing performance and strength and is suitable for scenarios that do not require frequent disassembly. Its application scope is relatively limited, maintenance costs are high, and the process is complex.

[0004] Figure 1 The diagram shows a conventional threaded short-section connector. In this connector, a slot is provided on the outer wall of the upper end of the lower short section's upper interface 4, and a key is provided on the inner wall of the lower end of the upper short section's lower interface 3. Because the key and slot are located on the lower end of the upper short section's lower interface 3 and the upper end of the lower short section's upper interface 4, the length of the short-section connection structure and positioning structure (i.e., the connector) between them is relatively long, making the installation process complex and resulting in weak stability, vibration resistance, and impact resistance. To meet the safety and reliability requirements of the short-section connection structure during oil well logging operations, a fast, simple, and accurate short-section connection structure needs to be designed to improve the connection efficiency, sealing performance, and structural stability between short sections. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of existing short joint structures, such as long joints, poor stability, inconvenient disassembly and assembly, and high maintenance costs, and to propose an ultra-short joint based on pin-fitting.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows: An ultra-short joint based on pin engagement includes an upper short section lower interface and a plug assembly disposed therein, and a lower short section upper interface and a socket assembly disposed at its end; its special feature is: The plug assembly includes a plug mounting base and a plurality of pins disposed in the middle of the plug mounting base, and a key is provided axially on the connecting end face of the plug mounting base; A radial positioning post is provided on the inner wall of the lower interface of the upper section, and a positioning hole is provided on the plug mounting base at a position corresponding to the radial positioning post. The radial positioning post and the positioning hole cooperate to form a circumferential positioning of the plug assembly and prevent it from rotating. The socket assembly includes a socket mounting base and multiple sockets located in the middle of the socket mounting base and adapted to multiple pins; the socket mounting base has a lower semi-circular keyway axially formed on its circumferential surface, adapted to the key; the inner wall of the upper interface of the lower section has an upper semi-circular keyway at a position corresponding to the lower semi-circular keyway, adapted to the key; the key is inserted into the keyway formed by the lower semi-circular keyway and the upper semi-circular keyway, for forming circumferential positioning during the assembly of the plug assembly and the socket assembly; The rear end of the socket mounting base is fixedly connected to a sliding bracket, and the sliding end of the sliding bracket is sleeved on the guide rod provided in the upper interface of the lower short section; the sliding end of the sliding bracket is provided with a boss that can slide along the upper semi-circular keyway, and the boss is used to form a circumferential positioning of the socket assembly in the upper interface of the lower short section to prevent it from rotating.

[0007] Furthermore, a limiting platform is provided on the guide rod, and a spring abuts between the limiting platform and the sliding end of the sliding bracket to prevent over-assembly between the plug assembly and the socket assembly.

[0008] Furthermore, positioning posts are provided on opposite sides of the front end of the guide rod; The sliding end of the sliding bracket is provided with axial positioning grooves at positions corresponding to the two positioning posts along the axial direction. The positioning posts are located in the positioning grooves. The sliding bracket drives the plug assembly to move back and forth along the axial direction. The positioning posts and positioning grooves cooperate to limit the circumferential rotation and axial displacement of the plug assembly.

[0009] Furthermore, an internal thread is provided on the inner wall of the lower interface of the upper subsection located at the outer end of the plug assembly; a threaded ring mounting groove is provided on the outer side of the upper interface of the lower subsection, and a threaded ring adapted to the internal thread is rotatably installed in the threaded ring mounting groove. By adjusting the connection relationship between the threaded ring and the internal thread, the assembly relationship between the plug assembly and the socket assembly is adjusted.

[0010] Furthermore, the threaded ring consists of two mutually symmetrical semi-circular threaded rings, and the connecting ends of the two semi-circular threaded rings are connected by bolts and installed in the threaded ring mounting groove. The inner annular surface of the threaded ring can rotate relative to the outer annular surface of the upper interface of the lower sub. The outer annular surface of the threaded ring is provided with an external thread that cooperates with the internal thread, so as to form a threaded connection between the lower interface of the upper sub and the upper interface of the lower sub.

[0011] Furthermore, the length of the upper semi-circular keyway is greater than the length of the key.

[0012] Furthermore, the length of the lower semicircular keyway is not greater than the length of the key.

[0013] Furthermore, at least one sealing ring mounting groove is provided on the outer circumference of the upper interface of the lower stub located at the front end of the threaded ring mounting groove. A sealing ring is provided in the sealing ring mounting groove to form a seal after the lower interface of the upper stub is connected to the upper interface of the lower stub.

[0014] Furthermore, two sealing ring mounting grooves are provided on the outer circumference of the upper interface of the lower section.

[0015] Furthermore, the outer wall of the rear end of the threaded ring is provided with a mounting hole for inserting a tool.

[0016] The beneficial effects of this utility model are: [1] The present invention provides an ultra-short joint based on pin-fitting structure with strong structural stability and easy assembly. The plug assembly is inserted into the keyway formed by the lower semi-circular keyway on the socket assembly and the upper semi-circular keyway on the inner wall of the interface of the lower short section, which effectively shortens the length of the short joint and also effectively ensures the connection accuracy and efficiency between two adjacent short joints. This effectively improves the connection stability and reliability of oil well logging instruments and extends the service life of the structure.

[0017] [2] This utility model uses the radial positioning post and the positioning hole on the plug assembly to form a circumferential positioning of the plug assembly, preventing it from rotating. This effectively improves the assembly accuracy between the plug assembly and the socket assembly, and avoids rotation during the insertion process, which could damage the short joint.

[0018] [3] The present invention can form a circumferential positioning of the socket assembly by means of the boss on the sliding end of the sliding bracket, which effectively ensures the docking accuracy of the socket assembly and the plug assembly, avoids rotation during the insertion process, and avoids affecting the docking accuracy between the short section connectors. It effectively saves production costs and production resources, and also improves the stability of the connection between adjacent short sections.

[0019] [4] The socket assembly in this utility model can effectively avoid damage to the short section connector caused by excessive assembly between the plug assembly and the socket assembly through the cooperation of the sliding bracket, the spring and the guide rod set in the upper interface of the lower short section. At the same time, it can also ensure proper assembly between the socket and the pin, ensuring that the oil well logging instrument can work normally, stably and continuously.

[0020] [5] This utility model forms a threaded connection between the lower interface of the upper short section and the upper interface of the lower short section through the internal thread and the threaded ring, which effectively improves the stability and reliability of the short section joint connection and improves the connection rigidity between the various short sections. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the short section connection structure between the lower interface of the upper short section and the upper interface of the lower short section in the background art. Figure 2 This is a cross-sectional view of an embodiment of the present invention, which is an ultra-short joint based on pin-fitting. Figure 3 This is a cross-sectional view of the plug assembly and socket assembly in the assembled state in an embodiment of this utility model; Figure 4 This is a perspective structural view of the plug assembly and socket assembly in the embodiments of this utility model; Figure 5 This is a cross-sectional view of the upper interface of the lower short section in an embodiment of this utility model; Figure label: 1-Plug assembly, 2-Socket assembly, 3-Upper short section lower interface, 4-Lower short section upper interface, 5-Plug mounting base, 6-Pin, 7-Key, 8-Radial positioning post, 9-Positioning hole, 10-Socket mounting base, 11-Socket, 12-Lower semi-circular keyway, 13-Upper semi-circular keyway, 14-Sliding bracket, 15-Guide rod, 16-Boss, 17-Limiting platform, 18-Spring, 19-Positioning post, 20-Positioning groove, 21-Internal thread, 22-Threaded ring mounting groove, 23-Threaded ring, 24-Sealing ring, 25-Sealing ring mounting groove. Detailed Implementation

[0022] like Figure 2 and Figure 3 As shown, an ultra-short joint based on pin engagement includes an upper short section lower interface 3 and a plug assembly 1 disposed therein, as well as a lower short section upper interface 4 and a socket assembly 2 disposed at its end. like Figure 4 As shown, the plug assembly 1 includes a plug mounting base 5 and a plurality of pins 6 disposed in the middle of the plug mounting base 5. A key 7 is provided axially on the connecting end face of the plug mounting base 5. A radial positioning post 8 is provided on the inner wall of the lower interface 3 of the upper subsection. A positioning hole 9 is provided on the plug mounting base 5 at a position corresponding to the radial positioning post 8. The radial positioning post 8 and the positioning hole 9 cooperate to form a circumferential positioning of the plug assembly 1 and prevent it from rotating. The socket assembly 2 includes a socket mounting base 10 and a plurality of sockets 11 disposed in the middle of the socket mounting base 10 and adapted to a plurality of pins 6; a lower semi-circular keyway 12 adapted to a key 7 is provided axially on the circumferential surface of the socket mounting base 10. like Figure 5As shown, an upper semicircular keyway 13, which is adapted to the key 7, is provided on the inner wall of the upper interface 4 of the lower short section at a position corresponding to the lower semicircular keyway 12. The key 7 is inserted into the keyway formed by the lower semicircular keyway 12 and the upper semicircular keyway 13, and is used to form circumferential positioning when the plug assembly 1 and the socket assembly 2 are assembled. The length of the upper semicircular keyway 13 is greater than the length of the key 7, and the length of the lower semicircular keyway 12 is not greater than the length of the key 7.

[0023] See Figures 2-5 The rear end of the socket mounting base 10 is fixedly connected to a sliding bracket 14. The sliding end of the sliding bracket 14 is sleeved on the guide rod 15 provided in the upper interface 4 of the lower short section. The sliding end of the sliding bracket 14 is provided with a boss 16 that can slide along the upper semi-circular keyway 13. The boss 16 is used to form a circumferential positioning of the socket assembly 2 in the upper interface 4 of the lower short section to prevent it from rotating. The guide rod 15 is provided with a limiting platform 17. A spring 18 abuts between the limiting platform 17 and the sliding end of the sliding bracket 14 to prevent over-assembly between the plug assembly 1 and the socket assembly 2.

[0024] Positioning posts 19 are provided on opposite sides of the front end of the guide rod 15; axial positioning grooves 20 are provided at the sliding end of the sliding bracket 14 at positions corresponding to the two positioning posts 19 along the axial direction. The positioning posts 19 are located in the positioning grooves 20. The sliding bracket 14 drives the plug assembly 1 to move back and forth along the axial direction. The positioning posts 19 and the positioning grooves 20 cooperate to limit the circumferential rotation and axial displacement of the plug assembly 1.

[0025] An internal thread 21 is provided on the inner wall of the lower interface 3 of the upper sub-section located at the outer end of the plug assembly 1; a threaded ring mounting groove 22 is provided on the outer side of the upper interface 4 of the lower sub-section, and a threaded ring 23 adapted to the internal thread 21 is rotatably installed in the threaded ring mounting groove 22. By adjusting the connection relationship between the threaded ring 23 and the internal thread 21, the assembly relationship between the plug assembly 1 and the socket assembly 2 is adjusted. The threaded ring 23 consists of two mutually symmetrical semi-circular threaded rings 23. The connecting ends of the two semi-circular threaded rings 23 are connected by bolts and installed in the threaded ring mounting groove 22; the inner ring surface of the threaded ring 23 and the outer ring surface of the upper interface 4 of the lower sub-section can rotate relative to each other, and the outer ring surface of the threaded ring 23 is provided with an external thread that mates with the internal thread 21, so as to form a threaded connection between the lower interface 3 of the upper sub-section and the upper interface 4 of the lower sub-section. Two sealing ring mounting grooves 25 are provided on the outer circumference of the upper interface 4 of the lower short section located at the front end of the threaded ring mounting groove 22. A sealing ring 24 is provided in the sealing ring mounting groove 25 to form a seal after the lower interface 33 of the upper short section is connected to the upper interface 4 of the lower short section.

Claims

1. An ultra-short joint connector based on pin engagement, comprising an upper short section lower interface (3) and a plug assembly (1) disposed therein, and a lower short section upper interface (4) and a socket assembly (2) disposed at its end; characterized in that: The plug assembly (1) includes a plug mounting base (5) and a plurality of pins (6) disposed in the middle of the plug mounting base (5). A key (7) is provided axially on the connecting end face of the plug mounting base (5). A radial positioning post (8) is provided on the inner wall of the lower interface (3) of the upper short section. A positioning hole (9) is provided on the plug mounting base (5) at a position corresponding to the radial positioning post (8). The radial positioning post (8) and the positioning hole (9) cooperate to form a circumferential positioning of the plug assembly (1) to prevent it from rotating. The socket assembly (2) includes a socket mounting base (10) and a plurality of sockets (11) disposed in the middle of the socket mounting base (10) and adapted to a plurality of pins (6); a lower semi-circular keyway (12) adapted to a key (7) is provided axially on the circumferential surface of the socket mounting base (10); an upper semi-circular keyway (13) adapted to a key (7) is provided on the inner wall of the upper interface (4) of the lower short section at a position corresponding to the lower semi-circular keyway (12); the key (7) is inserted into the keyway formed by the lower semi-circular keyway (12) and the upper semi-circular keyway (13) for forming circumferential positioning when the plug assembly (1) and the socket assembly (2) are assembled; The rear end of the socket mounting base (10) is fixedly connected to a sliding bracket (14), and the sliding end of the sliding bracket (14) is sleeved on the guide rod (15) provided in the upper interface (4) of the lower short section; a boss (16) that can slide along the upper semi-circular keyway (13) is provided on the sliding end of the sliding bracket (14), and the boss (16) is used to form a circumferential positioning of the socket assembly (2) in the upper interface (4) of the lower short section to prevent it from rotating.

2. The ultra-short joint based on pin fitting according to claim 1, characterized in that: A limiting platform (17) is provided on the guide rod (15), and a spring (18) abuts between the limiting platform (17) and the sliding end of the sliding bracket (14) to prevent over-assembly between the plug assembly (1) and the socket assembly (2).

3. The ultra-short joint based on pin fitting according to claim 2, characterized in that: Positioning posts (19) are provided on opposite sides of the front end of the guide rod (15). The sliding end of the sliding bracket (14) is provided with axial positioning grooves (20) at the positions corresponding to the two positioning posts (19) along the axial direction. The positioning posts (19) are located in the positioning grooves (20). The sliding bracket (14) drives the plug assembly (1) to move back and forth along the axial direction. The positioning posts (19) and positioning grooves (20) cooperate to limit the circumferential rotation and axial displacement of the plug assembly (1).

4. The ultra-short joint based on pin fitting according to claim 1, characterized in that: An internal thread (21) is provided on the inner wall of the lower interface (3) of the upper short section located at the outer end of the plug assembly (1); a threaded ring mounting groove (22) is provided on the outer side of the upper interface (4) of the lower short section, and a threaded ring (23) adapted to the internal thread (21) is rotatably installed in the threaded ring mounting groove (22). By adjusting the connection relationship between the threaded ring (23) and the internal thread (21), the assembly relationship between the plug assembly (1) and the socket assembly (2) is adjusted.

5. The ultra-short joint based on pin fitting according to claim 4, characterized in that: The threaded ring (23) consists of two symmetrical semi-circular threaded rings (23). The connecting ends of the two semi-circular threaded rings (23) are connected by bolts and installed in the threaded ring mounting groove (22). The inner ring surface of the threaded ring (23) and the outer ring surface of the upper interface (4) of the lower sub-section can rotate relative to each other. The outer ring surface of the threaded ring (23) is provided with an external thread that cooperates with the internal thread (21) to form a threaded connection between the lower interface (3) of the upper sub-section and the upper interface (4) of the lower sub-section.

6. The ultra-short joint based on pin fitting according to claim 5, characterized in that: The length of the upper semi-circular keyway (13) is greater than the length of the key (7).

7. The ultra-short joint based on pin fitting according to claim 6, characterized in that: The length of the lower semicircular keyway (12) is not greater than the length of the key (7).

8. The ultra-short joint based on pin fitting according to claim 7, characterized in that: At least one sealing ring mounting groove (25) is provided on the outer circumference of the upper interface (4) of the lower short section located at the front end of the threaded ring mounting groove (22). A sealing ring (24) is provided in the sealing ring mounting groove (25) to form a seal after the lower interface (3) of the upper short section and the upper interface (4) of the lower short section are connected.

9. The ultra-short joint based on pin fitting according to claim 8, characterized in that: Two sealing ring mounting grooves (25) are provided on the outer circumference of the upper interface (4) of the lower section.

10. The ultra-short joint based on pin fitting according to claim 5, characterized in that: The outer wall of the rear end of the threaded ring (23) is provided with a mounting hole for inserting a tool.

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