Underground small-size high-power coaxial connector

Abstract

The invention relates to an underground small-size high-power coaxial connector which is characterized in that a connector female joint comprises two first direct-current conducting rings and three first alternating-current conducting rings, and the first direct-current conducting rings and the first alternating-current conducting rings are connected into a whole through a first plastic insulating sleeve in an injection molding manner; the first plastic insulating sleeve is provided with a first plug connector, and the first plug connector is provided with two first direct current jacks and three first alternating current jacks; the connector male joint can be coaxially inserted into the connector female joint and comprises a positioning rod, the positioning rod is sleeved with a conducting rod, the conducting rod is provided with two second direct-current conducting rings and three second alternating-current conducting rings, and the conducting rod is provided with a second plugging joint. The second plugging connector is provided with two second direct current jacks and three second alternating current jacks. According to the invention, simultaneous transmission of small-size and high-power dynamic electricity and direct-current carrier communication is realized, the direct-current carrier transmission efficiency is reliable, and the problems of real-time control and signal transmission of the underground electric drilling tool are effectively solved.

Description

Technical Field

[0001] The present invention relates to the field of drilling equipment in the petroleum industry, and in particular to a downhole small-size high-power coaxial connector, which is a key component used in continuous pipe electric drilling technology. Background Art

[0002] At present, the domestic and foreign coiled tubing drilling technology mainly uses mechanical motors as power drills. The connectors used in the system mainly provide low-voltage DC power supply and carrier communication for various functional modules downhole, and are generally low-power connectors with 2 to 5 core structures. Compared with mechanical drilling tools, electric drilling tools have the advantages of efficient power output under low hydraulic energy efficiency conditions and easy high-speed control. They can solve the problem of insufficient effective power output in coiled tubing drilling and achieve fast drilling at low drilling pressure and high speed. The speed and torque are steplessly adjustable, which is convenient for closed-loop automatic control of drilling parameters, which is conducive to improving mechanical drilling speed and drill bit footage and reducing the number of trips.

[0003] In the prior art, there is a downhole electric drill and continuous pipe electric drilling system, in which the connector is a two-core rotary coaxial structure, with a rated voltage of 750V and a rated current of 52A. The male connector conductive ring is a complete copper ring, and the two phases are separated by insulating rubber material. The female connector conductive ring is a fixed lantern spring structure, and both male and female connectors are integrated injection molding. The downhole connector can only provide power for the electric drill, but cannot provide power and signal transmission for various functional short sections in the well, and has a single functionality; the connector is large in size and provides low electrical power; the waterproof performance is poor, and the insulation performance is unstable; the installation and disassembly are more troublesome, and the on-site replacement and cleaning are inconvenient.

[0004] Therefore, the inventor, relying on many years of experience and practice in related industries, proposes a small-size, high-power coaxial connector for underground use to overcome the defects of the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a small-size, high-power downhole coaxial connector, which can realize the small size of the downhole connector, the simultaneous transmission of high-power power electricity and DC carrier communication, the maximum transmission power of 70kW, high temperature and high pressure resistance, and reliable DC carrier transmission efficiency, and effectively solve the bottleneck problem of long-distance power transmission and signal transmission failure in continuous pipe drilling technology, and ensure the safe and smooth operation of the entire system.

[0006] The object of the present invention is achieved by providing a downhole small-size high-power coaxial connector, comprising:

[0007] A female connector, comprising two first DC conductive rings and three first AC conductive rings arranged at insulating intervals along an axial direction, wherein each of the first DC conductive rings and each of the first AC conductive rings are connected as one through a first plastic insulating sleeve by injection molding, and the first end of the first plastic insulating sleeve is open; a first plug connector is arranged at the second end of the first plastic insulating sleeve, and the first plug connector and the first plastic insulating sleeve are connected as one through an integrated injection molding sleeve; two first DC sockets and three first AC sockets are arranged on the first plug connector, each of the first DC conductive rings is electrically connected to each of the first DC sockets, and each of the first AC conductive rings is electrically connected to each of the first AC sockets;

[0008] A connector male connector can be coaxially plugged into the connector female connector, including a positioning rod, a conductive rod is sleeved on the positioning rod, two second DC conductive rings that can contact the first DC conductive ring and three second AC conductive rings that can contact the first AC conductive ring are arranged inwardly at the second end of the conductive rod, a second plug connector is arranged at the first end of the conductive rod, two second DC jacks and three second AC jacks are arranged on the second plug connector, each of the second DC conductive rings is electrically connected to each of the second DC jacks, and each of the second AC conductive rings is electrically connected to each of the second AC jacks; each of the second DC conductive rings, each of the second AC conductive rings and the conductive rod are connected as a whole by injection molding through a second plastic insulating sleeve.

[0009] In a preferred embodiment of the present invention, each of the second DC conductive rings and each of the second AC conductive rings includes a male connector ring body, a dovetail groove is provided on the outer wall of the male connector ring body, a finger contact spring is installed in the dovetail groove, and the finger contact spring is in electrical contact with each of the first DC conductive rings or each of the first AC conductive rings.

[0010] In a preferred embodiment of the present invention, the male connector ring body is made of beryllium bronze material, and the male connector ring body and the finger spring are both gold-plated.

[0011] In a preferred embodiment of the present invention, the second DC conductive ring and the second AC conductive ring are arranged at an insulating interval inward from the second end of the positioning rod, and each of the second DC conductive rings and each of the second AC conductive rings are arranged in a stepped manner with increasing diameters, and a male connector O-ring is provided between two adjacent second DC conductive rings, between adjacent second DC conductive rings and second AC conductive rings, and between two adjacent second AC conductive rings.

[0012] In a preferred embodiment of the present invention, five second conductive support rods of different lengths are extended from the first end to the second end of the conductive rod, the first end of each of the second conductive support rods is respectively electrically connected to the second DC socket or the second AC socket, and the second end of each of the second conductive support rods is respectively in contact with and electrically connected to the second DC conductive ring or the second AC conductive ring.

[0013] In a preferred embodiment of the present invention, the second conductive support rod is configured as a flat round rod.

[0014] In a preferred embodiment of the present invention, vulcanized rubber layers are respectively provided at two axial ends of each of the first DC conductive rings and each of the first AC conductive rings.

[0015] In a preferred embodiment of the present invention, a locking nut is provided on the inner side of the first end of the first plastic insulating sleeve.

[0016] In a preferred embodiment of the present invention, five first conductive support rods of different lengths are extended on the first plug connector toward the first AC conductive ring, a first end of each of the first conductive support rods is electrically connected to the first DC socket or the first AC socket, and a second end of each of the first conductive support rods is electrically connected to the first DC conductive ring or the first AC conductive ring.

[0017] In a preferred embodiment of the present invention, the first conductive support rod is configured as a flat rod.

[0018] In a preferred embodiment of the present invention, each of the first DC conductive rings and each of the first AC conductive rings are made of beryllium copper material and are gold-plated.

[0019] In a preferred embodiment of the present invention, a first metal shell is sleeved on the integrated injection-molded sleeve at a position opposite to the first plug connector; and a second metal shell is sleeved on the second plastic insulating sleeve at a position opposite to the second plug connector.

[0020] In a preferred embodiment of the present invention, a first limiting ring groove is provided on the outer wall of the first metal shell, and a first sealing and pressure-resistant O-ring is sleeved in the first limiting ring groove; a second limiting ring groove is provided on the outer wall of the second metal shell, and a second sealing and pressure-resistant O-ring is sleeved in the second limiting ring groove.

[0021] In a preferred embodiment of the present invention, the first plug connector and the second plug connector are gold-plated.

[0022] As described above, the downhole small-size high-power coaxial connector of the present invention has the following beneficial effects:

[0023] The small-size and high-power downhole coaxial connector of the present invention has two DC conductive rings and three AC conductive rings on both the male connector and the female connector, forming a five-core coaxial rotating plug-in structure, realizing the plug-in connection of the three-core AC power cable and the two-core DC cable, providing high-power power for downhole electric drilling tools, and at the same time providing power and DC carrier communication for various functional short sections downhole; each conductive ring of the female connector is insulated and protected by a first plastic insulating sleeve, and each conductive ring of the male connector is insulated and protected by a second plastic insulating sleeve; the entire connector is injection molded using a high-temperature integrated process, and has reliable strength and insulation performance, meeting the requirements of downhole drilling tools. The invention can realize the sealing of downhole high-pressure environment, insulation of high-voltage and high-current environment, multiple plugging and unplugging and reliability in mud acid-base corrosion environment; the tails of the male connector and the female connector are respectively provided with corresponding plug-in connectors, which have the functions of self-cleaning, quick replacement and maintenance; the present invention realizes the small size of the downhole connector, the simultaneous transmission of high-power power electricity and DC carrier communication, the maximum transmission power reaches 70kW, it is resistant to high temperature and high pressure, and the DC carrier transmission efficiency is reliable, which effectively solves the real-time control and signal transmission problems of downhole electric drilling tools, and effectively solves the bottleneck problem of long-distance power transmission and signal transmission failure in continuous pipe drilling technology, and ensures the safe and smooth operation of the whole system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following drawings are only intended to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0025] in:

[0026] Figure 1 : It is a schematic diagram of the downhole small-size high-power coaxial connector of the present invention.

[0027] Figure 2 : is a cross-sectional view of the connector female connector of the present invention.

[0028] Figure 3 :for Figure 2 A view in the figure.

[0029] Figure 4 : is a cross-sectional view of the male connector of the connector of the present invention.

[0030] Figure 5 :for Figure 4 B view in the figure.

[0031] In the figure:

[0032] 1. Female connector;

[0033] 11. A first DC conductive ring;

[0034] 12. a first alternating current conducting ring;

[0035] 13. A first plastic insulating sleeve;

[0036] 14. First plug connector; 141. First DC socket; 142. First AC socket;

[0037] 15. Integrated injection molding sleeve;

[0038] 16. Vulcanized rubber layer;

[0039] 17. Lock the spare nut;

[0040] 18. A first metal housing;

[0041] 2. Connector male connector;

[0042] 21. A second DC conducting ring;

[0043] 22. a second alternating current conducting ring;

[0044] 23. A second plastic insulating sleeve;

[0045] 24. Second plug connector; 241. Second DC socket; 242. Second AC socket;

[0046] 25. Positioning rod;

[0047] 26. Conductive rod;

[0048] 27. Male connector O-ring;

[0049] 28. Second metal casing. DETAILED DESCRIPTION

[0050] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described with reference to the accompanying drawings.

[0051] The specific embodiments of the present invention described herein are only used to explain the purpose of the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention. It should be noted that when an element is referred to as "arranged on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0053] like Figures 1 to 5 As shown, the present invention provides a downhole small-size high-power coaxial connector, comprising:

[0054] The female connector 1 comprises two first DC conductive rings 11 and three first AC conductive rings 12 (each conductive ring constitutes one phase) arranged at an axial insulating interval. Each first DC conductive ring 11 and each first AC conductive ring 12 are connected together by injection molding through a first plastic insulating sleeve 13 (PEEK modified, reinforced and toughened polymer plastic material is used as an insulator, and is molded by high-temperature injection molding). The first end of the first plastic insulating sleeve 13 is open; the second end of the first plastic insulating sleeve 13 is provided with a first plug connector 14, and the first plug connector 14 It is connected to the first plastic insulating sleeve 13 through an integrated injection molding sleeve 15; two first DC sockets 141 and three first AC sockets 142 are arranged on the first plug connector 14, each first DC conductive ring 11 is electrically connected to each first DC socket 141, and each first AC conductive ring 12 is electrically connected to each first AC socket 142; the outer wall size of the integrated injection molding sleeve 15 of the connector female connector 1 constitutes the outer diameter size of the downhole small-size high-power coaxial connector of the present invention, which is greatly reduced compared with the external dimensions of the connector in the prior art.

[0055] The connector male connector 2 can be coaxially plugged into the connector female connector 1, and includes a positioning rod 25, on which a conductive rod 26 is sleeved, and two second DC conductive rings 21 that can contact the first DC conductive ring 11 and three second AC conductive rings 22 that can contact the first AC conductive ring 12 are arranged inwardly at the second end of the conductive rod 26, and a second plug connector 24 is arranged at the first end of the conductive rod 26, and two second DC sockets 241 and three second AC sockets 242 are arranged on the second plug connector 24, each second DC conductive ring 21 is electrically connected to each second DC socket 241, and each second AC conductive ring 22 is electrically connected to each second AC socket 242; each second DC conductive ring 21, each second AC conductive ring 22 and the conductive rod 26 are connected as a whole by injection molding through a second plastic insulating sleeve 23.

[0056] The first plastic insulating sleeve 13 and the second plastic insulating sleeve 23 are both insulators made of a polymer plastic material modified by PEEK and reinforced to be toughened, and a reasonable insulation spacing is designed to ensure a safe creepage distance.

[0057] The downhole connector is a key component in the cable-type continuous tubing drilling system that connects cables, non-rotating connectors, various downhole functional modules and electric motors. At present, difficulties such as the reliable sealing technology of the connector in a small space and the reliable insulation technology in a small space have seriously restricted the development of long-distance power and signal transmission technology. The failure of the connector will directly lead to a short circuit in the downhole tool, and there is a risk of tool damage. In view of the above difficulties, the downhole small-size and high-power coaxial connector of the present invention is proposed. The present invention is a key component that connects the cable with various downhole functional modules and electric motors in the cable-type continuous tubing electric drilling system.

[0058] In a specific embodiment, the rated voltage of the downhole small-size high-power coaxial connector is greater than 1000V, the rated current is greater than 100A, the maximum transmission power is 70kW, and the overall outer diameter is less than 50mm, meeting the requirements of small size and high power.

[0059] The small-size and high-power downhole coaxial connector of the present invention has two DC conductive rings and three AC conductive rings on both the male connector and the female connector, forming a five-core coaxial rotating plug-in structure, realizing the plug-in connection of the three-core AC power cable and the two-core DC cable, providing high-power power for downhole electric drilling tools, and at the same time providing power and DC carrier communication for various functional short sections downhole; each conductive ring of the female connector is insulated and protected by a first plastic insulating sleeve, and each conductive ring of the male connector is insulated and protected by a second plastic insulating sleeve; the entire connector is injection molded using a high-temperature integrated process, and has reliable strength and insulation performance, meeting the requirements of downhole drilling tools. The invention can realize the sealing of downhole high-pressure environment, insulation of high-voltage and high-current environment, multiple plugging and unplugging and reliability in mud acid-base corrosion environment; the tails of the male connector and the female connector are respectively provided with corresponding plug-in connectors, which have the functions of self-cleaning, quick replacement and maintenance; the present invention realizes the small size of the downhole connector, the simultaneous transmission of high-power power electricity and DC carrier communication, the maximum transmission power reaches 70kW, it is resistant to high temperature and high pressure, and the DC carrier transmission efficiency is reliable, which effectively solves the real-time control and signal transmission problems of downhole electric drilling tools, and effectively solves the bottleneck problem of long-distance power transmission and signal transmission failure in continuous pipe drilling technology, and ensures the safe and smooth operation of the whole system.

[0060] Further, if Figure 4 As shown, each second DC conductive ring 21 and each second AC conductive ring 22 includes a male connector ring body, a dovetail groove is provided on the outer wall of the male connector ring body, and a finger spring is installed in the dovetail groove. The finger spring is in contact and electrically connected with each first DC conductive ring 11 or each first AC conductive ring 12.

[0061] Furthermore, the male connector ring body is made of beryllium bronze material, and the male connector ring body and the finger spring are both gold-plated, with a maximum current conduction capacity of more than 100A.

[0062] The first DC conductive ring 11 and the first AC conductive ring 12 of the connector female connector 1 are complete circular ring structures. The contact surfaces of the first DC conductive ring 11 and the first AC conductive ring 12 are polished and contact the finger spring of the connector male connector 2 after being plugged in, thereby realizing the transmission of high-power electric energy and carrier signals.

[0063] Further, if Figure 4As shown, a second DC conductive ring 21 and a second AC conductive ring 22 are arranged inwardly at an insulating interval from the second end of the positioning rod 25, and each second DC conductive ring 21 and each second AC conductive ring 22 are arranged in a stepped manner with increasing diameters, and a male connector O-ring 27 is arranged between two adjacent second DC conductive rings 21, between adjacent second DC conductive rings 21 and second AC conductive rings 22, and between two adjacent second AC conductive rings 22. The conductive rings are arranged in a stepped manner, and each phase is separated by a male connector O-ring 27 to effectively isolate the water film.

[0064] Further, if Figure 4 , Figure 5 As shown, five second conductive support rods of different lengths are extended from the first end to the second end of the conductive rod 26, and the first end of each second conductive support rod is respectively electrically connected to the second DC socket 241 or the second AC socket 242, and the second end of each second conductive support rod is respectively in contact with and electrically connected to the second DC conductive ring 21 or the second AC conductive ring 22.

[0065] Furthermore, the second conductive support rods are configured as flat round rods. Each second conductive support rod of the connector male connector 2 adopts a special flat round structure, and a PEEK sleeve and a heat shrink tube are installed on the outside, which effectively increases the phase spacing while ensuring the conductive performance.

[0066] Further, if Figure 2 As shown, vulcanized rubber layers 16 are respectively disposed at the axial ends of each first DC conductive ring 11 and each first AC conductive ring 12. The end faces of each conductive ring of the female connector 1 are moisture-proofed by the vulcanized rubber layer 16, thereby enhancing the waterproof performance.

[0067] Further, if Figure 2 As shown, a locking nut 17 is provided inside the first end of the first plastic insulating sleeve 13. After all parts are assembled, they are put into the PEEK sleeve and locked and positioned before injection molding, which effectively ensures the injection molding quality.

[0068] The insulating part of the underground small-size high-power coaxial connector of the present invention is injection molded using high-performance PEEK material through a high-temperature and high-pressure integrated process. The insulation distance between each phase of the connector female connector 1 and the connector male connector 2 is scientifically calculated and tested and verified. At the same time, a step ladder structure is adopted between each phase to effectively increase the creepage distance. The insulating layer of the connector male connector 2 is equipped with a male connector O-ring 27 between each phase for water film isolation to achieve a self-cleaning function during insertion. All the conductive rings and the contact end faces of the insulating material of the connector female connector 1 are treated with rubber vulcanization, and O-rings are installed on the contact end faces for water film isolation. After the parts are assembled, they are integrally loaded into the PEEK sleeve for high-temperature injection molding.

[0069] Further, if Figure 2 , Figure 3As shown, five first conductive support rods of different lengths are extended from the first plug connector 14 toward the first AC conductive ring 12, and the first end of each first conductive support rod is electrically connected to the first DC socket 141 or the first AC socket 142, and the second end of each first conductive support rod is electrically connected to the first DC conductive ring 11 or the first AC conductive ring 12.

[0070] Furthermore, the first conductive support rod is arranged in a flat rod shape, a heat shrink tube is installed on the outside, a bridge lap structure is adopted between each phase, and each bridging conductive ring is processed with vulcanized rubber, which effectively ensures the radial creepage distance, increases the insulation performance, and effectively reduces the outer diameter of the connector.

[0071] Furthermore, each first DC conductive ring 11 and each first AC conductive ring 12 is made of beryllium copper material and is gold-plated, and the maximum current conducting capacity is more than 100A.

[0072] Further, if Figure 1 , Figure 2 As shown, a first metal shell 18 is sleeved on the integrated injection-molded sleeve 15 at a position opposite to the first plug connector 14 ; and a second metal shell 28 is sleeved on the second plastic insulating sleeve 23 at a position opposite to the second plug connector 24 .

[0073] Furthermore, a first limiting ring groove is provided on the outer wall of the first metal shell 18, and a first sealing and pressure-resistant O-ring is sleeved in the first limiting ring groove; a second limiting ring groove is provided on the outer wall of the second metal shell 28, and a second sealing and pressure-resistant O-ring is sleeved in the second limiting ring groove, so as to realize quick installation, fixation and pressure-resistant sealing of the connector.

[0074] Furthermore, the first plug connector 14 and the second plug connector 24 are gold-plated.

[0075] A first plug connector 14 is provided at the tail end of the connector female connector 1, and a second plug connector 24 is provided at the tail end of the connector male connector 2, so as to realize quick plugging and unplugging; the connector is gold-plated to improve the conductivity, and cooperates with the five-core socket to realize quick plugging and unplugging of the wellhead connector.

[0076] The present invention adopts a seven-stage high-temperature injection molding process, the highest injection molding temperature reaches above 350° C., the injection molding pressure is controlled at above 10 MPa, and the injection molding time, insulation time and cooling time are all strictly carried out in accordance with the process requirements.

[0077] As described above, the downhole small-size high-power coaxial connector of the present invention has the following beneficial effects:

[0078] The small-size and high-power downhole coaxial connector of the present invention has two DC conductive rings and three AC conductive rings on both the male connector and the female connector, forming a five-core coaxial rotating plug-in structure, realizing the plug-in connection of the three-core AC power cable and the two-core DC cable, providing high-power power for downhole electric drilling tools, and at the same time providing power and DC carrier communication for various functional short sections downhole; each conductive ring of the female connector is insulated and protected by a first plastic insulating sleeve, and each conductive ring of the male connector is insulated and protected by a second plastic insulating sleeve; the entire connector is injection molded using a high-temperature integrated process, and has reliable strength and insulation performance, meeting the requirements of downhole drilling tools. The invention can realize the sealing of downhole high-pressure environment, insulation of high-voltage and high-current environment, multiple plugging and unplugging and reliability in mud acid-base corrosion environment; the tails of the male connector and the female connector are respectively provided with corresponding plug-in connectors, which have the functions of self-cleaning, quick replacement and maintenance; the present invention realizes the small size of the downhole connector, the simultaneous transmission of high-power power electricity and DC carrier communication, the maximum transmission power reaches 70kW, it is resistant to high temperature and high pressure, and the DC carrier transmission efficiency is reliable, which effectively solves the real-time control and signal transmission problems of downhole electric drilling tools, and effectively solves the bottleneck problem of long-distance power transmission and signal transmission failure in continuous pipe drilling technology, and ensures the safe and smooth operation of the whole system.

[0079] The above description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention.

Claims

1. A downhole small-size high-power coaxial connector, characterized in that: include: A female connector, comprising two first DC conductive rings and three first AC conductive rings arranged at insulating intervals along an axial direction, wherein each of the first DC conductive rings and each of the first AC conductive rings are connected as one through a first plastic insulating sleeve by injection molding, and the first end of the first plastic insulating sleeve is open; a first plug connector is arranged at the second end of the first plastic insulating sleeve, and the first plug connector and the first plastic insulating sleeve are connected as one through an integrated injection molding sleeve; two first DC sockets and three first AC sockets are arranged on the first plug connector, each of the first DC conductive rings is electrically connected to each of the first DC sockets, and each of the first AC conductive rings is electrically connected to each of the first AC sockets; A connector male connector can be coaxially plugged into the connector female connector, including a positioning rod, a conductive rod is sleeved on the positioning rod, two second DC conductive rings that can contact the first DC conductive ring and three second AC conductive rings that can contact the first AC conductive ring are arranged inwardly at the second end of the conductive rod, a second plug connector is arranged at the first end of the conductive rod, two second DC jacks and three second AC jacks are arranged on the second plug connector, each of the second DC conductive rings is electrically connected to each of the second DC jacks, and each of the second AC conductive rings is electrically connected to each of the second AC jacks; each of the second DC conductive rings, each of the second AC conductive rings and the conductive rod are connected as a whole by injection molding through a second plastic insulating sleeve.

2. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: Each of the second DC conductive rings and each of the second AC conductive rings includes a male connector ring body, a dovetail groove is provided on the outer wall of the male connector ring body, a finger contact spring is installed in the dovetail groove, and the finger contact spring is in electrical contact with each of the first DC conductive rings or each of the first AC conductive rings.

3. The downhole small-size high-power coaxial connector according to claim 2, characterized in that: The male connector ring body is made of beryllium bronze material, and both the male connector ring body and the finger spring are gold-plated.

4. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: The second DC conductive ring and the second AC conductive ring are arranged at insulated intervals inward from the second end of the positioning rod, and each of the second DC conductive rings and each of the second AC conductive rings are arranged in a stepped manner with increasing diameters, and a male connector O-ring is arranged between two adjacent second DC conductive rings, between adjacent second DC conductive rings and second AC conductive rings, and between two adjacent second AC conductive rings.

5. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: Five second conductive support rods of different lengths are extended from the first end to the second end of the conductive rod, the first end of each of the second conductive support rods is electrically connected to the second DC socket or the second AC socket, and the second end of each of the second conductive support rods is electrically connected to the second DC conductive ring or the second AC conductive ring.

6. The downhole small-size high-power coaxial connector according to claim 5, characterized in that: The second conductive support rod is in the form of a flat round rod.

7. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: Vulcanized rubber layers are respectively provided at two axial ends of each of the first DC conductive rings and each of the first AC conductive rings.

8. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: A locking nut is arranged on the inner side of the first end of the first plastic insulating sleeve.

9. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: Five first conductive support rods of different lengths are extended on the first plug connector toward the first AC conductive ring, a first end of each of the first conductive support rods is electrically connected to the first DC socket or the first AC socket, and a second end of each of the first conductive support rods is electrically connected to the first DC conductive ring or the first AC conductive ring.

10. The downhole small-size high-power coaxial connector according to claim 9, characterized in that: The first conductive support rod is arranged in the form of a flat rod.

11. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: Each of the first direct current conductive rings and each of the first alternating current conductive rings are made of beryllium copper material and are gold-plated.

12. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: A first metal shell is sleeved on the integrated injection-molded sleeve at a position opposite to the first plug connector; and a second metal shell is sleeved on the second plastic insulating sleeve at a position opposite to the second plug connector.

13. The downhole small-size high-power coaxial connector according to claim 12, characterized in that: A first limiting ring groove is arranged on the outer wall of the first metal shell, and a first sealing and pressure-resistant O-ring is sleeved in the first limiting ring groove; a second limiting ring groove is arranged on the outer wall of the second metal shell, and a second sealing and pressure-resistant O-ring is sleeved in the second limiting ring groove.

14. The downhole small-size high-power coaxial connector according to claim 1, characterized in that: The first plug connector and the second plug connector are gold-plated.

Images