CN110130840B - Underground electric connection-available universal torque transmission device - Google Patents

Abstract

The invention belongs to the technical field of precise electrical connection, and in particular relates to a universal torque transmission device which can be electrically connected in a downhole. The downhole can be connected to the universal torsion device by using the torque transmission between the two non-concentric rotating structures to convert the non-concentric motion of the two non-concentric rotating structures into concentric motion through the universal flexible shaft. And a wire hole is arranged inside the device to realize the electrical and signal transmission of the two non-concentric rotating structures. The device of the invention can realize the universal torque transmission function of large torque under the condition of limited radial space size, and can realize the communication of electricity and signal at the same time, and the electricity and signal are transmitted through hard wires. The structure of the entire torque transmission device is simple and reliable, and the structure can be adjusted according to the application occasion, and the usability is strong. Both ends of the universal torque transmission device use coaxial connectors and contact slip rings for electrical and signal connections, which are easy to disassemble and assemble, the entire device is modular, and the replacement and maintenance are simple and reliable.

Description

A universal torque transmission device with over-electric connection for underground

technical field

The invention belongs to the technical field of precise electrical connection, and in particular relates to a universal torque transmission device which can be electrically connected in a well.

Background technique

The universal torque transmission device is widely used in downhole drilling tools, such as screw drilling tools, rotary steering tools, etc., mainly to achieve universal and transmit torque. Taking screw drilling tools as an example, the stator performs planetary motion in the rotor cavity, and through the universal torque transmission device, the planetary motion can be converted into coaxial motion, thereby providing drilling power for the drill bit.

Existing solutions: petal-type universal torque transmission structure and spherical hinge universal torque transmission structure, while petal-type universal torque transmission structure and spherical hinge universal torque transmission structure have low lifespan, complex structure, and the most important problems. It is impossible to realize over-power and signal connection.

SUMMARY OF THE INVENTION

The embodiment of the present disclosure discloses an over-electrically connectable universal torque transmission device for downhole to solve any of the above and other potential problems in the prior art.

In order to achieve the above purpose, the embodiment of the present disclosure discloses an over-electrically connectable universal torque transmission device for downhole, which utilizes the transmission of torque between two non-concentric rotating structures , the non-concentric motion of the two non-concentric rotating structures is universally transmitted and twisted into concentric motion through the universal flexible shaft, and a wire hole is arranged inside the device to realize the electrical connection and signal transmission of the two non-concentric rotating structures.

According to an embodiment of the present disclosure, the downhole over-electrically connectable universal torque transmission device includes a universal flexible shaft, a flexible shaft lower joint, a flexible shaft lower joint connecting device, a flexible shaft upper joint, a flexible shaft upper joint connecting device, and a universal flexible shaft joint. shaft housing;

Wherein, the flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are all arranged inside the universal shaft casing, and the two ends of the universal shaft casing are respectively connected with the casings of different equipment, The flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are arranged in sequence from left to right, and the two ends of the universal flexible shaft are connected to the flexible shaft through the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device respectively. The lower joint and the upper joint of the flexible shaft are connected; the lower joint of the flexible shaft and the upper joint of the flexible shaft respectively require equipment connection for electrical and signal connection.

According to the embodiment of the present disclosure, the inside of the universal flexible shaft, the lower joint of the flexible shaft and the upper joint of the flexible shaft, which can be electrically connected to the universal torque transmission device, are all provided with threading holes;

One end of the lower joint of the flexible shaft is connected with the rotor, and the end of the end connected with the rotor is provided with a connector socket, and the other end of the lower joint of the flexible shaft is connected with one end of the universal flexible shaft by interference fitting, Connected by a flexible shaft on-joint connection for torque transmission;

The other end of the universal flexible shaft and one end of the lower joint of the flexible shaft are connected by interference fitting, and the universal flexible shaft and the lower joint of the flexible shaft are connected together through the connecting device of the lower flexible shaft for transmitting torque, and the lower joint of the flexible shaft is connected together. The other end of the joint is connected with the bearing support drive shaft, and the end face of the contact slip ring is contacted and pressed to realize electrical connection and signal connection;

The end of the lower joint of the flexible shaft connected with the bearing support transmission shaft is provided with several mud holes, and the mud holes communicate with the inner bearing support transmission shaft mud holes of the bearing support transmission shaft;

A wiring cavity is provided on the lower joint of the flexible shaft between the mud hole and the connection between the universal flexible shaft and the lower joint of the flexible shaft, and the wiring cavity is respectively connected to the inner joint of the universal flexible shaft. The wiring hole communicates with the internal wiring hole of the joint on the flexible shaft, and a wiring hole plug and a plug sealing ring are arranged at the entrance of the wiring cavity.

According to the embodiment of the present disclosure, both ends of the universal flexible shaft are provided with boss structures, and the boss structures pass through the first sealing ring a and the lower joint of the flexible shaft and the second sealing ring b and the flexible shaft. A seal is formed between the joints on the shaft.

According to the embodiment of the present disclosure, the material of the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device is high-strength stainless steel, and the diameters of the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device are related to the required transmission torque. proportional to the size.

According to an embodiment of the present disclosure, the downhole over-electrically connectable universal torque transmission device further includes a bushing for preventing the high-speed mud flowing through the mud channel from eroding the inner wall of the bearing supporting transmission shaft, the bushing is provided with the Between the lower joint of the flexible shaft and the bearing supporting transmission shaft, the bushing and the lower joint of the flexible shaft are sealed by the bushing sealing ring a, and the bushing and the bearing supporting transmission shaft are sealed by the bushing sealing ring b.

According to the embodiment of the present disclosure, the material of the universal flexible shaft is titanium alloy, the universal flexible shaft realizes universal orientation and transmits torque, the eccentric displacement of the upper joint of the flexible shaft and the lower joint of the flexible shaft is 0-7 mm, and the universal flexible shaft Shaft transmission torque is 0-14000Nm.

According to an embodiment of the present disclosure, the bushing material is cemented carbide.

According to the embodiment of the present disclosure, the end of the joint on the flexible shaft is sealed with the rotor through the sealing ring of the joint on the flexible shaft.

According to the embodiment of the present disclosure, the flexible shaft lower joint and the bearing support transmission shaft are sealed by the flexible shaft lower joint sealing ring.

The beneficial effects of the present invention are: due to the adoption of the above technical solutions, the device of the present invention can realize the function of high torque universal torque transmission under the condition of limited radial space size, and can realize the communication of electricity and signal at the same time. Line transmission, reliable and no signal packet loss. The structure of the entire torque transmission device is simple and reliable, and the structure can be adjusted according to the application occasion, and the usability is strong. The flexible shaft is made of titanium alloy, which has good strength and fatigue resistance, and has a long overall life. Both ends of the universal torque transmission device use coaxial connectors and contact slip rings for electrical and signal connections, which are easy to disassemble and assemble, the entire device is modular, and the replacement and maintenance are simple and reliable.

Description of drawings:

FIG. 1 is a schematic structural diagram of a universal torsion transmission device that can be electrically connected in a downhole according to the present invention.

FIG. 2 is a schematic cross-sectional structural diagram of a universal torsion transmission device that can be electrically connected in a downhole according to the present invention.

FIG. 3 is a partial enlarged structural schematic diagram of an over-electrically connectable universal torque transmission device for downhole according to the present invention.

FIG. 4 is a partial enlarged structural schematic diagram of a universal torsion transmission device that can be electrically connected in a downhole according to the present invention.

In the picture:

1-Universal flexible shaft, 1.1-thread hole, 2-flexible shaft lower joint, 2.1-mud channel, 2.2-connection cavity, 3-connection hole plug, 4-flexible shaft lower joint connection device, 5-bearing support Transmission shaft, 6-flex shaft upper joint, 7-flexible shaft upper joint connection device, 8-rotor, 9-bushing, 10-cardan shaft housing, 11-stator housing, 12-wire, 13-first Flexible shaft sealing ring, a 14-plug sealing ring, 15- bushing sealing ring a, 16- bushing sealing ring b, 17- flexible shaft lower joint sealing ring, 18- second flexible shaft sealing ring b, 19- Joint sealing ring on flexible shaft, 20-connector socket, 21-connector pin, 22-connector base, 23-contact slip ring, 24-boss structure.

Detailed ways

The technical solutions of the present invention will be further described below with reference to the accompanying drawings.

As shown in Figures 1-4, the present invention is an over-electrically connectable universal torque transmission device for downhole, which utilizes the transmission of torque between two non-concentric rotating structures, The non-concentric motion of two non-concentric rotating structures is universally transmitted and twisted into concentric motion through a universal flexible shaft, and a wire hole is arranged inside the device to realize electrical and signal transmission of the two non-concentric rotating structures.

According to an embodiment of the present disclosure, the downhole over-electrically connectable universal torque transmission device includes a universal flexible shaft, a flexible shaft lower joint, a flexible shaft lower joint connecting device, a flexible shaft upper joint, a flexible shaft upper joint connecting device, and a universal flexible shaft joint. shaft housing;

Wherein, the flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are all arranged inside the universal shaft casing, and the two ends of the universal shaft casing are respectively connected with the casings of different equipment, The flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are arranged in sequence from left to right, and the two ends of the universal flexible shaft are connected to the flexible shaft through the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device respectively. The lower joint and the upper joint of the flexible shaft are connected; the lower joint of the flexible shaft and the upper joint of the flexible shaft respectively require equipment connection for electrical and signal connection.

According to the embodiment of the present disclosure, the inside of the universal flexible shaft, the lower joint of the flexible shaft and the upper joint of the flexible shaft, which can be electrically connected to the universal torque transmission device, are all provided with threading holes;

One end of the lower joint of the flexible shaft is connected with the rotor, and the end of the end connected with the rotor is provided with a connector socket, and the other end of the lower joint of the flexible shaft is connected with one end of the universal flexible shaft by interference fitting, Connected by a flexible shaft on-joint connection for torque transmission;

The other end of the universal flexible shaft and one end of the lower joint of the flexible shaft are connected by interference fitting, and the universal flexible shaft and the lower joint of the flexible shaft are connected together through the connecting device of the lower flexible shaft for transmitting torque, and the lower joint of the flexible shaft is connected together. The other end of the joint is connected with the bearing support drive shaft through trapezoidal threads, and the end face of the contact slip ring is contacted and pressed to realize electrical connection and signal connection;

The end of the lower joint of the flexible shaft connected with the bearing support transmission shaft is provided with several mud holes, and the mud holes communicate with the inner bearing support transmission shaft mud holes of the bearing support transmission shaft;

A wiring cavity is provided on the lower joint of the flexible shaft between the mud hole and the connection between the universal flexible shaft and the lower joint of the flexible shaft, and the wiring cavity is respectively connected to the inner joint of the universal flexible shaft. The wiring hole communicates with the internal wiring hole of the joint on the flexible shaft, and a wiring hole plug and a plug sealing ring are arranged at the entrance of the wiring cavity.

According to the embodiment of the present disclosure, both ends of the universal flexible shaft are provided with boss structures, and the boss structures pass through the first sealing ring a and the lower joint of the flexible shaft and the second sealing ring b and the flexible shaft. A seal is formed between the joints on the shaft.

According to the embodiment of the present disclosure, the material of the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device is high-strength stainless steel, and the diameters of the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device are related to the required transmission torque. proportional to the size.

According to an embodiment of the present disclosure, the downhole over-electrically connectable universal torque transmission device further includes a bushing for preventing the high-speed mud flowing through the mud channel from eroding the inner wall of the bearing supporting transmission shaft, the bushing is provided with the Between the lower joint of the flexible shaft and the bearing supporting transmission shaft, the bushing and the lower joint of the flexible shaft are sealed by the bushing sealing ring a, and the bushing and the bearing supporting transmission shaft are sealed by the bushing sealing ring b.

According to the embodiment of the present disclosure, the material of the universal flexible shaft is titanium alloy, the universal flexible shaft realizes universal orientation and transmits torque, the eccentric displacement of the upper joint of the flexible shaft and the lower joint of the flexible shaft is 0-7 mm, and the universal flexible shaft Shaft transmission torque is 0-14000Nm.

According to an embodiment of the present disclosure, the bushing material is cemented carbide.

A mud channel is formed between the universal shaft housing 10 and the upper joint 6 of the flexible shaft, the universal flexible shaft 1, and the lower joint 2 of the flexible shaft. The mud flows into the bearing support transmission shaft from the annular space at the mud channel 2.1 of the lower joint 2 of the flexible shaft. 5 through holes in the middle.

The universal shaft housing 10 supports the transmission shaft 5 through the bearing, and transmits the motion transmitted by the rotor 8 to the lower part through the bearing supporting the transmission shaft 5, and finally transmits it to the drill bit to form drilling power.

The universal flexible shaft 1 has a certain flexibility and can realize universal and transmit torque. The eccentric displacement of the upper joint 6 of the flexible shaft and the lower joint 2 of the flexible shaft is 0-7mm, and the transmission torque of the universal flexible shaft 1 is 0-14000Nm. Eccentric displacement and transmission torque requirements can change the length, diameter and material of the flexible shaft. The diameter is 60mm and the length is 1400mm. The material used is titanium alloy with excellent toughness and strength.

A wire hole 1.1 with a diameter of 6mm is arranged in the middle of the universal flexible shaft 1, which is used to pass a wire.

One end of the universal flexible shaft 1 is connected with the upper joint 6 of the flexible shaft by interference fitting, and the universal flexible shaft 1 and the upper joint 6 of the flexible shaft are connected together through the upper joint connecting device 7 of the flexible shaft. The upper joint connecting device 7 is used for To transmit torque, the diameter of the joint connecting device 7 on the flexible shaft is related to the required transmitted torque, and the material is high-strength stainless steel.

Both the flexible shaft lower joint connecting device 4 and the flexible shaft lower joint connecting device 7 are pins.

The connection between the other end of the lower joint of the flexible shaft and the bearing support transmission shaft is a trapezoidal thread.

Both ends of the universal flexible shaft 1 are provided with boss structures 24, which are connected to the flexible shaft lower joint 2 through the first sealing ring b13 and the flexible shaft upper joint 6 through the second sealing ring b18. A seal is formed between them to prevent high-pressure mud from entering the wire hole in the middle of the universal flexible shaft 1.

The joint 6 on the flexible shaft is connected with the rotor 8 by conical threads, and the end of the joint 6 on the flexible shaft is sealed with the rotor 8 through the sealing ring 20 of the joint on the flexible shaft.

A 6mm through hole is provided in the middle of the joint 6 on the flexible shaft for passing the wire. A connector socket 20 is installed at the end of the joint 6 on the flexible shaft.

The connector base 22 is connected with the rotor 8 through threads, and the connector base 22 is provided with connector pins 21 .

The joint 6 on the flexible shaft is connected with the rotor 8 by tapered threads, and the connector pins 21 on the connector base 22 are connected with the connector socket 20 on the joint 6 on the flexible shaft to realize electrical and signal transmission.

The other end of the universal flexible shaft 1 is connected with the lower flexible shaft joint 2 by interference fitting, and the universal flexible shaft 1 and the lower flexible shaft joint 2 are connected together through the flexible shaft lower joint connecting device 4. The flexible shaft lower joint connecting device 4 is used for For the transmission of torque, the diameter of the joint connecting device 4 on the flexible shaft is related to the required transmission torque, and the material is made of high-strength stainless steel.

The lower flexible shaft joint 2 is provided with a mud channel 2.1, which introduces the mud from the annular space between the universal shaft housing 10 and the lower flexible shaft joint 2 to the mud channel in the center of the bearing support transmission shaft 5. The mud channel 2.1 is evenly distributed with four mud flow channel holes of the same size in the circumferential direction.

The flexible shaft lower joint 2 and the bearing support transmission shaft 5 are connected by trapezoidal threads, and the flexible shaft lower joint 2 and the bearing support transmission shaft 5 are sealed by the flexible shaft lower joint sealing ring 17 .

A bushing 9 is installed between the lower joint 2 of the flexible shaft and the bearing supporting transmission shaft 5, the bushing 9 and the lower joint 2 of the flexible shaft are sealed by the bushing sealing ring a 15, and the space between the bushing 9 and the bearing supporting transmission shaft 5 The bushing sealing ring b 16 is sealed to prevent high-pressure mud from invading the contact slip ring 23 between the lower joint 2 of the flexible shaft and the bearing support drive shaft 5, resulting in failure of electrical connection and signal communication.

The material of the bushing 9 is cemented carbide, and its main function is to prevent the high-speed mud flowing through the mud channel 2.1 from eroding the inner wall of the bearing support transmission shaft 5, and to improve the life of the bearing support transmission shaft 5.

After the thread between the lower joint 2 of the flexible shaft and the bearing support transmission shaft 5 is tightened, the end face of the contact slip ring 23 is contacted and pressed to realize electrical and signal connection.

The lower joint 2 of the flexible shaft is provided with a wiring cavity 2.2, in which the wires coexist with wires, and the wires pass from the center to the side wall of the lower joint 2 of the flexible shaft, so as to support the transmission shaft 5 through the contact slip ring 23 and the bearing Make electrical and signal connections.

The wiring cavity 2.2 of the lower joint 2 of the flexible shaft, the wire coming from the center of the universal flexible shaft 1 and the wire coming from the side wall of the lower joint 2 of the flexible shaft are welded at the connecting cavity 2.2, and the welded joint is stored in the wiring In the cavity 2.2, it is blocked by the wiring hole plug 3, and the wiring hole plug 3 is connected with the lower joint 2 of the flexible shaft through threads, and is sealed by the plug sealing ring 14 to prevent the high-pressure mud from entering the wiring cavity 2.2.

The wire is introduced from the center of the rotor, connected to the connector socket 20 through the connector pin 21, and then reaches the connection cavity 2.2 of the lower joint 2 of the flexible shaft through the central through hole of the upper flexible shaft joint 6 and the central through hole of the universal flexible shaft 1, The wire thus passes over to the side wall of the lower joint 2 of the flexible shaft, connects with the bearing support drive shaft 5 through the contact slip ring 23, and continues to transmit along the wire hole on the side wall of the bearing support drive shaft 5, so as to realize Electricity and signal transmission through universal torque transmission device.

The seal of the whole device is absolutely sealed, that is, all the wire holes are air, and the outside of the seal is high pressure mud.

Although several embodiments of the present invention have been presented herein, those skilled in the art should understand that changes may be made to the embodiments herein without departing from the spirit of the present invention. The above-mentioned embodiments are only exemplary, and the embodiments herein should not be construed as limiting the scope of the rights of the present invention.

Claims (8)

1. The underground electric connection-available universal torque transmission device is characterized in that the universal torque transmission device converts non-concentric motions of two non-concentric rotating structures into concentric motions through a universal flexible shaft by utilizing torque transmission between the two non-concentric rotating structures, and a wire guide hole is arranged in the device to realize electric connection and signal transmission of the two non-concentric rotating structures; the underground electric connection-available universal torque transmission device comprises a universal flexible shaft, a flexible shaft lower joint connecting device, a flexible shaft upper joint connecting device and a universal shaft shell;

the flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are all arranged inside the universal shaft shell, two ends of the universal shaft shell are respectively connected with two shells of non-concentric rotating structures, the flexible shaft lower joint, the universal flexible shaft and the flexible shaft upper joint are sequentially arranged from left to right, and two ends of the universal flexible shaft are respectively connected with the flexible shaft lower joint and the flexible shaft upper joint through the flexible shaft lower joint connecting device and the flexible shaft upper joint connecting device;

the flexible shaft lower joint and the flexible shaft upper joint are respectively connected with two non-concentric rotating structure devices which need to realize electric and signal transmission; threading holes are formed in the universal flexible shaft, the flexible shaft lower joint and the flexible shaft upper joint which can be electrically connected with the universal torque transmission device for underground use;

one end of the flexible shaft upper joint is connected with the rotor, a connector socket is arranged at the end part of one end of the flexible shaft upper joint connected with the rotor, and the other end of the flexible shaft upper joint is in interference fit connection with one end of the universal flexible shaft and is connected with the flexible shaft upper joint connecting device used for transmitting torque;

the other end of the universal flexible shaft is in interference fit connection with one end of a flexible shaft lower joint, the universal flexible shaft is connected with the flexible shaft lower joint through a flexible shaft lower joint connecting device used for transmitting torque, and the other end of the flexible shaft lower joint is connected with a bearing support transmission shaft and is in contact compression with the end face of a contact type slip ring to realize electric and signal connection;

a plurality of mud holes are formed in one end, connected with the bearing support transmission shaft, of the lower flexible shaft joint, and the mud holes are communicated with mud holes of the bearing support transmission shaft in the bearing support transmission shaft; be located the mud hole with the universal axle of scratching with scratch between the axle lower clutch junction scratch the epaxial lower clutch of last wiring cavity that is equipped with, the wiring cavity respectively with the universal axle of scratching inside through wires hole with scratch the inside through wires hole intercommunication of epaxial top connection, the entrance of wiring cavity is equipped with wiring hole end cap and end cap sealing washer.

2. An electrically connectable downhole universal torque transmission device according to claim 1, wherein the end portions of the two ends of the universal flexible shaft are provided with boss structures, and the boss structures are sealed with the flexible shaft lower joint through the first sealing ring a and the flexible shaft upper joint through the second sealing ring b.

3. An electrically connectable downhole universal torque transmission according to claim 1, wherein the flexible shaft lower joint connection means and the flexible shaft upper joint connection means are made of high strength stainless steel, and the diameters of the flexible shaft lower joint connection means and the flexible shaft upper joint connection means are proportional to the amount of torque to be transmitted.

4. The downhole electrically-connectable universal torque transmission device according to any one of claims 1 to 3, further comprising a bushing for preventing high-speed slurry flowing through the slurry channel from eroding the inner wall of the bearing support transmission shaft, wherein the bushing is disposed between the upper joint of the flexible shaft and the bearing support transmission shaft, the bushing is sealed with the lower joint of the flexible shaft by a bushing sealing ring a, and the bushing is sealed with the bearing support transmission shaft by a bushing sealing ring b, so as to prevent slurry from invading into a contact slip ring between the lower joint of the flexible shaft and the bearing support transmission shaft, thereby causing failure of electrical connection and signal communication.

5. The device of claim 1, wherein the universal flexible shaft is made of titanium alloy, the universal flexible shaft realizes universal joint and transmits torque, the eccentric displacement of the flexible shaft upper joint and the flexible shaft lower joint is 0-7mm, and the universal flexible shaft transmits torque in the range of 0-14000 Nm.

6. An electrically connectable universal torque transmission according to claim 4 wherein the material of the bushing is cemented carbide.

7. An electrically connectable downhole universal torque coupling according to claim 1 wherein said end of said flexible shaft upper joint is sealed to the rotor by a flexible shaft upper joint seal.

8. An electrically connectable universal torque coupling according to claim 1, wherein the lower flexible shaft joint is sealed from the bearing support transmission shaft by a lower flexible shaft joint seal ring.

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