Downhole tubular self-cooling multi-channel high-torque high-power permanent magnet motor

Abstract

The utility model discloses an underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor, which comprises a shell sealing assembly used for ensuring the sealing of a working area in the motor, preventing drilling fluid and rock debris from being poured in, fixing a stator assembly and ensuring the rotation stability of a rotor assembly; the stator assembly is fixedly connected with the shell sealing assembly and used for converting the electric energy into magnetic field energy and providing a stable magnetic field for the rotor; the rotor assembly is coaxially connected with the shell sealing assembly, located in the stator assembly and used for converting magnetic field energy into kinetic energy; the transmission channel assembly provides a channel for a data transmission line and a motor cooling medium for the motor and the underground mechanism; according to the utility model, the technical blank that the existing motor machine tool does not have the functions of simultaneously meeting the underground operation shape, self-cooling, multiple transmission channels and generating high torque and high power is filled up, the motor is automatically cooled in the drilling process, and the motor cooling device has great significance in the drilling and well drilling industries and has great application prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to an underground tubular self-cooling multi-channel high-torque and high-power permanent magnet motor. Background Art

[0002] In existing technology, permanent magnet motors typically consist of a stator and a rotor. These motors rely on the stator's coils to generate an induced magnetic field and the rotor's permanent magnets to output power. Their output torque (power) is proportional to the motor's effective volume. To achieve higher output power, the stator and rotor volumes must be increased proportionally. Currently, these motors are increasingly used in downhole drilling tools due to their compact size, light weight, portability, ease of installation, and high control precision. However, the motors used in downhole drilling tools currently have the following problems that need to be solved: First, due to the deep drilling depth and limited space in the well, the heat generated by the high-power motor cannot be discharged in time, which can easily exceed the motor's temperature limit and become inoperable, and there is currently no effective heat dissipation method; second, because multiple motors are used in the well at the same time, the cables of the motors and other electronic components located below need to pass through the upper motors to connect to the power supply and control terminals on the ground, and there are currently no relevant reports on solving this problem; third, the motor rotor needs to be able to transmit torque to the drill bit and have a large diameter channel for drilling fluid circulation, and there are currently no products that can meet this requirement. Therefore, there is an urgent need for a utility model that can solve the above problems. It has a high-torque, high-power permanent magnet motor with a large hollow rotor, a self-cooling circulation channel, and a multi-channel cable structure and function. Summary of the Invention

[0003] In response to the problems existing in the existing technology, the purpose of the present invention is to provide an underground tubular self-cooling multi-channel high-torque and high-power permanent magnet motor, which is mainly used to meet the needs of underground operations, hollow tubular torque transmission, self-cooling, and multiple cable transmission channels, while being able to generate high torque and high power permanent magnet motors.

[0004] The technical solution adopted by the present invention to achieve the above-mentioned purpose is:

[0005] A downhole tubular self-cooling multi-channel high-torque and high-power permanent magnet motor, comprising:

[0006] The housing seal assembly is used to ensure the sealing of the working area inside the motor to prevent drilling fluid and cuttings from pouring in, fix the stator assembly and ensure the stability of the rotor assembly's rotation;

[0007] The stator assembly is fixedly connected to the housing sealing assembly and is used to convert electrical energy into magnetic field energy to provide a stable magnetic field for the rotor;

[0008] The rotor assembly is coaxially connected to the housing seal assembly and is located within the stator assembly to convert magnetic field energy into kinetic energy;

[0009] The transmission channel assembly provides a channel for data transmission lines and motor cooling medium for the motor and downhole mechanism.

[0010] Furthermore, the housing seal assembly includes a cylindrical housing, an upper joint, a lower joint, a sealed double-row ball bearing, a tapered roller bearing, an inner bearing gland, an outer bearing gland, a spring washer, and an upper joint retaining ring;

[0011] The two ends of the cylindrical shell are respectively connected to the upper joint and the lower joint by screws, the sealed double-row ball bearing connects the lower joint to the hollow rotor shaft for uniaxial rotation, the tapered roller bearing connects the upper joint to the hollow rotor shaft for uniaxial rotation, the bearing inner pressure cover is screwed to the inner side of the lower joint, the bearing outer pressure cover is threadedly connected to the upper end of the hollow rotor shaft, the spring washer is placed between the upper joint retaining ring and the tapered roller bearing, and the upper joint retaining ring is connected to the inner clamp of the upper joint.

[0012] Furthermore, the stator assembly includes an iron core and windings;

[0013] The iron core is coaxially fixedly connected to the inside of the cylindrical shell, and the winding wires have a total of M (an even number greater than 10) bundles, which are respectively wound on the M teeth of the iron core.

[0014] Furthermore, the rotor assembly includes a hollow rotor shaft, permanent magnets, and a rotor retaining ring; the two ends of the hollow rotor shaft are rotatably connected to the upper joint and the lower joint respectively through sealed double-row ball bearings and tapered roller bearings, the permanent magnets have a total of M pieces, and are respectively fixed on the surface of the hollow rotor shaft in a circumferential arrangement, and the rotor retaining ring is connected to the upper end of the hollow rotor shaft by a clamp.

[0015] Furthermore, the transmission channel assembly includes an insulating green wall, a power line, a signal line, and a cooling medium circulation pipe. The insulating green walls have a total of N (N is greater than 3), which respectively pass through the upper joint, the lower joint, and N circumferentially arranged rounded rectangular holes on the iron core and are fixedly connected to the hole walls. The power line, signal line, and cooling medium circulation pipe all pass through the inside of the insulating green wall.

[0016] Beneficial effects of the utility model:

[0017] The utility model fills the technical gap in the existing motor equipment that does not have the characteristics of meeting the requirements of downhole operation shape (hollow tubular shape), self-cooling, multiple transmission channels and generating high torque and high power. While achieving high torque and high power, the hollow tubular shape meets the drilling requirements. The multi-channel structure provides a channel for power and data signal transmission for the drilling equipment, and also provides a convenient channel for motor cooling. It is of great significance in the drilling and well drilling industries and has great application prospects, including but not limited to conventional drilling, polar coring drilling, and extraterrestrial coring and sampling drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a side view of the present utility model.

[0019] Figure 2 yes Figure 1 Cross-sectional view at AA′.

[0020] Figure 3 This is a three-dimensional structural breakdown diagram of the housing sealing assembly.

[0021] Figure 4 This is a three-dimensional structural breakdown diagram of the stator assembly.

[0022] Figure 5 This is a three-dimensional structural breakdown diagram of the rotor assembly.

[0023] Figure 6 This is a three-dimensional structural breakdown diagram of the transmission channel component.

[0024] Figure 7 This is a three-dimensional structural split diagram of the utility model.

[0025] Figure 8 It is a schematic diagram of the self-cooling principle of the utility model.

[0026] Explanation of the reference numerals: 100: housing sealing assembly, 200: stator assembly, 300: rotor assembly, 400: transmission channel assembly, 101: cylindrical housing, 102: upper joint, 103: lower joint, 104: sealed double-row ball bearing, 105: tapered roller bearing, 106: bearing inner pressure cover, 107: bearing outer pressure cover, 108: spring gasket, 109: upper joint retaining ring, 201: iron core, 202: winding, 301: hollow rotor shaft, 302: permanent magnet, 303: rotor retaining ring, 401: insulating green wall, 402: power line, 403: signal line, 404: cooling medium circulation pipe. DETAILED DESCRIPTION

[0027] See also Figures 1 to 6As shown, a downhole tubular self-cooling multi-channel high-torque and high-power permanent magnet motor includes a housing sealing assembly 100, a stator assembly 200, a rotor assembly 300 and a transmission channel assembly 400;

[0028] The housing seal assembly 100 includes a cylindrical housing 101, an upper joint 102, a lower joint 103, a sealed double-row ball bearing 104, a tapered roller bearing 105, an inner bearing gland 106, an outer bearing gland 107, a spring washer 108 and an upper joint retaining ring 109;

[0029] The two ends of the cylindrical housing 101 are screwed to the upper joint 102 and the lower joint 103 respectively, so that the housing is sealed. The sealed double-row ball bearing 104 connects the lower joint 103 to the hollow rotor shaft 301 for uniaxial rotation. The tapered roller bearing 105 connects the upper joint 102 to the hollow rotor shaft 301 for uniaxial rotation, so that the hollow rotor can rotate relative to the housing sealing assembly 100. The bearing inner pressure cover 106 is screwed to the inner side of the lower joint 103, and the bearing outer pressure cover 107 is screwed to the hollow rotor shaft 301. 01 The upper end is threadedly connected, and the bearing inner pressure cover 106 and the bearing outer pressure cover 107 respectively provide axial opposite pressures for the sealed double-row ball bearing 104, so that the sealed double-row ball bearing 104 is axially fixed. The spring washer 108 is cushioned between the upper joint retaining ring 109 and the tapered roller bearing 105, and the blocking effect provided by the upper joint retaining ring 109 is transmitted to the tapered roller bearing 105, so that it is axially fixed. The upper joint retaining ring 109 is connected to the inner clamp of the upper joint 102 for axially fixing the tapered roller bearing 105;

[0030] The stator assembly 200 includes an iron core 201 and a winding 202;

[0031] The iron core 201 is coaxially fixedly connected to the inside of the cylindrical shell 101 and is used to wind the windings 202 to form a magnetic field. The windings 202 have a total of 18 bundles, which are wound around the 18 teeth of the iron core 201 respectively to convert electrical energy into magnetic field energy.

[0032] The rotor assembly 300 includes a hollow rotor shaft 301, a permanent magnet 302 and a rotor retaining ring 303;

[0033] The ends of the hollow rotor shaft 301 are rotatably connected to the upper joint 102 and the lower joint 103 via sealed double-row ball bearings 104 and tapered roller bearings 105, respectively. There are 18 permanent magnets 302, which are arranged circumferentially and fixed to the surface of the hollow rotor shaft 301. They convert magnetic field energy into kinetic energy, driving the hollow rotor shaft 301 to rotate. The rotor retaining ring 303 is connected to the upper end of the hollow rotor shaft 301 by a clamp to axially fix the tapered roller bearings 105.

[0034] The transmission channel assembly 400 includes an insulating green wall 401, a power line 402, a signal line 403 and a cooling medium circulation pipe 404;

[0035] There are 18 insulating green walls 401, which pass through the upper connector 102, the lower connector 103 and the 18 circumferentially arranged rounded rectangular holes on the iron core 201 and are fixedly connected to the hole walls, providing sealed and insulated channels for the power line 402, the signal line 403 and the cooling medium circulation pipe 404. The power line 402, the signal line 403 and the cooling medium circulation pipe 404 all pass through the inside of the insulating green wall 401. The power line 402 and the signal line 403 provide power and signal transmission to the motor and other equipment outside the motor. The cooling medium circulation pipe 404 provides a circulation channel for the cooling medium. The cooling medium circulates in the space formed between the motor and the drilling rig. There is flowing drilling coolant outside the motor, which automatically cools the motor during drilling.

Claims

1. A downhole tubular self-cooling multi-channel high-torque high-power permanent magnet motor, characterized in that: include: The housing seal assembly is used to ensure the sealing of the working area inside the motor to prevent drilling fluid and cuttings from pouring in, fix the stator assembly and ensure the stability of the rotation of the rotor assembly; The stator assembly is fixedly connected to the housing sealing assembly and is used to convert electrical energy into magnetic field energy to provide a stable magnetic field for the rotor; A rotor assembly, coaxially connected to the housing seal assembly and located within the stator assembly, converts magnetic field energy into kinetic energy; The transmission channel assembly provides a channel for data transmission lines and motor cooling medium for the motor and downhole mechanism.

2. According to claim 1, a tubular self-cooling multi-channel high-torque high-power permanent magnet motor for underground use is characterized in that: The housing seal assembly comprises a cylindrical housing, an upper joint, a lower joint, a sealed double-row ball bearing, a tapered roller bearing, an inner bearing gland, an outer bearing gland, a spring gasket and an upper joint retaining ring; The two ends of the cylindrical shell are respectively connected to the upper joint and the lower joint, the sealed double-row ball bearing connects the lower joint to the hollow rotor shaft for uniaxial rotation, the tapered roller bearing connects the upper joint to the hollow rotor shaft for uniaxial rotation, the bearing inner pressure cover is connected to the inner side of the lower joint, the bearing outer pressure cover is connected to the upper end of the hollow rotor shaft, the spring gasket is padded between the upper joint retaining ring and the tapered roller bearing, and the upper joint retaining ring is connected to the inner side of the upper joint.

3. According to claim 2, a tubular self-cooling multi-channel high-torque high-power permanent magnet motor for underground use is characterized in that: The stator assembly comprises an iron core and windings; The iron core is coaxially fixedly connected to the inside of the cylindrical shell, and the winding wire is wound on the teeth of the iron core.

4. The underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor according to claim 3 is characterized in that: The windings have M bundles in total, which are respectively wound on M teeth of the iron core, where M is an even number greater than 10.

5. The underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor according to claim 4 is characterized in that: The rotor assembly includes a hollow rotor shaft, permanent magnets and a rotor retaining ring; the two ends of the hollow rotor shaft are rotatably connected to the upper joint and the lower joint respectively through sealed double-row ball bearings and tapered roller bearings, the permanent magnets are circumferentially arranged and fixed on the surface of the hollow rotor shaft, and the rotor retaining ring is connected to the upper end of the hollow rotor shaft.

6. The underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor according to claim 5, characterized in that: There are M pieces of the permanent magnets in total.

7. The underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor according to claim 6, characterized in that: The transmission channel assembly includes an insulating green wall, a power line, a signal line and a cooling medium circulation pipe. The insulating green wall passes through the upper joint, the lower joint and the holes arranged circumferentially on the iron core respectively, and is fixedly connected to the hole wall. The power line, the signal line and the cooling medium circulation pipe all pass through the inside of the insulating green wall.

8. The underground tubular self-cooling multi-channel high-torque high-power permanent magnet motor according to claim 7, characterized in that: There are N insulating green walls in total, and N is greater than 3.

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