Segmented assembly type submersible permanent magnet synchronous motor

Abstract

The utility model discloses a subsection assembly type submersible permanent magnet synchronous motor which comprises motor sections and spline assemblies, the motor sections are connected through the spline assemblies, each motor section comprises a single-section shell and a motor shaft, the single-section shells are connected in a welding mode to form a motor shell, the two ends of each single-section shell are respectively provided with a supporting sleeve, and the motor shaft is connected with the supporting sleeves. The motor shaft penetrates into the single-section shell, the two ends of the motor shaft penetrate to the outer side of the supporting sleeve respectively, the two ends of the motor shaft are provided with shaft sleeves respectively, the shaft sleeves play a role in protecting the motor shaft, the spline assembly comprises a bearing seat, a spline sleeve and a self-aligning roller bearing, and the connecting ends of the motor shaft are inserted into the spline sleeve respectively. A cavity is reserved between the connecting ends of the motor shaft; the whole submersible permanent magnet synchronous motor adopts a segmented assembly structure, the length of a single motor shaft can be effectively reduced, submersible permanent magnet synchronous motors with different lengths can be assembled, the self-aligning performance is good, and the coaxiality error of the motor shafts can be compensated.

Description

Technical Field

[0001] The utility model relates to the technical field of submersible motors, in particular to a segmented assembled submersible permanent magnet synchronous motor. Background Art

[0002] The submersible permanent magnet synchronous motor direct-drive screw pump oil production system is aimed at the oil field production field and can be applied to both onshore and offshore oil fields. It has obvious application advantages under complex well conditions such as highly deviated wells, horizontal wells and heavy oil wells.

[0003] Due to the inner diameter of the oil well casing, the torque of the submersible motor is increased by increasing the length. Due to the increase in the motor shaft, the motor shaft will bend and deform during processing, assembly, transportation, lifting, operation, etc., which can easily cause product failure, and processing and assembly are relatively difficult. Chinese patent application No. 202310786909.3 discloses an axial flux multi-disc submersible permanent magnet synchronous motor, which relates to the technical field of submersible motors, including: a casing, which is cylindrical; a main shaft, the main shaft and the casing are rotatably matched, and the main shaft and the casing are coaxial; although multiple bearings are arranged on the main shaft at intervals along the axial direction, each motor unit is located between two adjacent bearings, it is difficult to ensure coaxiality due to the long main shaft, and the above-mentioned technical problems exist. Similarly, Chinese patent application No. 202121259135.1 discloses a low-speed, high-torque submersible permanent magnet synchronous motor with an external rotor. The rotor cores are connected by a centering bearing, and magnetic steel is provided in the rotor core. It also has the above-mentioned technical problems, so a segmented assembly submersible permanent magnet synchronous motor is proposed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a segmented assembled submersible permanent magnet synchronous motor. The submersible permanent magnet synchronous motor adopts a segmented assembly structure as a whole, which can effectively reduce the length of a single motor shaft, which is beneficial to production, transportation and assembly. At the same time, it can be assembled into submersible permanent magnet synchronous motors of different lengths, and its centering performance is good, which can compensate for the coaxiality error of the motor shaft, ensure that the submersible permanent magnet synchronous motor works stably and reliably, and can effectively solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a segmented assembled submersible permanent magnet synchronous motor, comprising a motor section and a spline assembly, the motor sections being connected by a spline assembly, the motor section comprising a single-section housing and a motor shaft, the single-section housings being connected by welding to form a motor housing, support sleeves being respectively provided at both ends of the single-section housing, the motor shaft being passed through the single-section housing, and the two ends of the motor shaft being respectively passed through to the outside of the support sleeves, shaft sleeves being respectively provided at both ends of the motor shaft, which protect the motor shaft, the spline assembly comprising a bearing seat, a spline sleeve and a spherical roller bearing, the connecting ends of the motor shaft being respectively inserted into the spline sleeves, a cavity being left between the connecting ends of the motor shaft, the bearing seat being fixed on the inner wall of the motor housing, and a spherical roller bearing being provided between the bearing seat and the spline sleeve.

[0006] Furthermore, the motor section includes a motor head section, a motor middle section and a motor tail section, and the three have the same structure. The motor head section is connected to the motor head, the end of the motor head is provided with a transport cap fixed by bolts, and the motor tail section is connected to the motor tail section.

[0007] Furthermore, the number of the motor intermediate section is set to at least one.

[0008] Furthermore, a magnetic steel assembly is provided in the circumferential direction of the motor shaft, a stainless steel tube is provided on the outside of the magnetic steel assembly, a stator plate is provided on the inner wall of the single-section shell, a motor winding is provided on the stator plate, the motor windings are connected by motor leads, and a wire hole for the motor leads to pass through is provided on the bearing seat.

[0009] Furthermore, the spline sleeve is provided with an inner boss in the circumferential direction, and the bearing seat is provided with an outer boss in the circumferential direction. The outer ring of the spherical roller bearing abuts against the outer boss, and the inner ring of the spherical roller bearing abuts against the inner boss.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. The submersible permanent magnet synchronous motor adopts a segmented assembly structure as a whole, which can effectively reduce the length of a single motor shaft. At the same time, it can be assembled into submersible permanent magnet synchronous motors of different lengths. In addition, it has good self-aligning performance and can compensate for the coaxiality error of the motor shaft, ensuring that the submersible permanent magnet synchronous motor works stably and reliably.

[0012] 2. The power transmission between the motor shafts is achieved through the spline sleeve. The motor shaft is assembled in sections, which is beneficial to improve the concentricity of the product during processing, and is convenient for processing, transportation and assembly, thereby improving work efficiency.

[0013] 3. The cavity is used to store oil, which can be used for lubrication and cooling. It can also leave space between the motor shafts, which is more stable than direct contact working. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the motor section structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the joint connection structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the overall structure of the utility model assembled in sections.

[0017] In the figure: 1 spline sleeve, 2 bearing seat, 3 spherical roller bearing, 4 support sleeve, 5 shaft sleeve, 6 single-section housing, 7 magnetic steel assembly, 8 stator plate, 9 stainless steel tube, 10 motor winding, 11 motor shaft, 12 motor lead, 13 cavity, 14 wire hole, 15 inner boss, 16 outer boss, 17 motor tail stock, 18 motor head section, 19 motor middle section, 20 motor tail section, 21 transport cap, 22 motor head. DETAILED DESCRIPTION

[0018] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0019] See also Figure 1-3The utility model provides a technical solution: a segmented assembled submersible permanent magnet synchronous motor, including a motor section and a spline assembly, the motor sections are connected by a spline assembly, the submersible permanent magnet synchronous motor as a whole adopts a segmented assembly structure, which can effectively reduce the length of a single motor shaft 11, which is conducive to production, transportation and assembly. At the same time, it can be assembled into submersible permanent magnet synchronous motors of different lengths to meet the needs. The motor section includes a single-section housing 6 and a motor shaft 11. The single-section housings 6 are connected to form a motor housing by welding. Support sleeves 4 are respectively provided at both ends of the single-section housing 6. The motor shaft 11 passes through the single-section housing 6, and the two ends of the motor shaft 11 pass through the outside of the support sleeve 4. Shaft sleeves 5 are respectively provided at both ends of the motor shaft 11. The shaft sleeves 5 play a role in protecting the motor shaft 11. The spline assembly includes a bearing seat 2, a spline sleeve 1 and a spherical roller The bearing 3 and the connecting ends of the motor shaft 11 are respectively inserted into the spline sleeve 1, and the power transmission between the motor shafts 11 is realized through the spline sleeve 1. The motor shaft 11 is assembled in sections, which is beneficial to improving the concentricity of the product during processing, and is convenient for processing and improves work efficiency. A cavity 13 is left between the connecting ends of the motor shaft 11, and the cavity 13 is used to store oil, which can be used for lubrication and cooling. It can also leave room for movement between the motor shafts 11, which is more stable than direct contact working effect. The bearing seat 2 is fixed on the inner wall of the motor housing, and a spherical roller bearing 3 is arranged between the bearing seat 2 and the spline sleeve 1. The spherical roller bearing 3 plays a role in mainly bearing radial loads on the motor shaft 11, and can also withstand axial loads in any direction. Its self-aligning performance is good, and it can compensate for the coaxiality error of the motor shaft 11, ensuring that the submersible permanent magnet synchronous motor works stably and reliably.

[0020] The motor section includes a motor head section 18, a motor middle section 19 and a motor tail section 20, and the structures of the three are the same. The motor head section 18 is connected to the motor head 22, and the end of the motor head 22 is bolted with a transport cap 21. The motor tail section 20 is connected to the motor tail section 20. The number of motor middle sections 19 is set to at least one, and the specific number of motor middle sections 19 used is set according to actual needs.

[0021] A magnetic steel assembly 7 is provided in the circumferential direction of the motor shaft 11, a stainless steel tube 9 is provided on the outside of the magnetic steel assembly 7, a stator sheet 8 is provided on the inner wall of the single-section housing 6, a motor winding 10 is provided on the stator sheet 8, the motor windings 10 are connected by a motor lead 12, one end of the motor lead 12 is connected to the flat connector of the motor head 22, and a wire hole 14 for the motor lead 12 to pass through is provided on the bearing seat 2.

[0022] An inner boss 15 is provided in the circumferential direction of the spline sleeve 1, and an outer boss 16 is provided in the circumferential direction of the bearing seat 2. The outer ring of the spherical roller bearing 3 abuts against the outer boss 16, and the inner ring of the spherical roller bearing 3 abuts against the inner boss 15. The outer boss 16 and the inner boss 15 limit the safe position of the spherical roller bearing 3, which facilitates the installation of the spherical roller bearing 3.

[0023] The above shows and describes the basic principles, main features and advantages of the present invention. Without departing from the spirit and scope of the present invention, the present invention may also have various changes and improvements, which fall within the scope of the present invention to be protected.

Claims

1. A segmented assembled submersible permanent magnet synchronous motor, comprising a motor segment and a spline assembly, characterized in that: The motor sections are connected by a spline assembly. The motor sections include a single-section housing (6) and a motor shaft (11). The single-section housings (6) are connected by welding to form a motor housing. Support sleeves (4) are respectively provided at both ends of the single-section housing (6). The motor shaft (11) is inserted into the single-section housing (6), and the two ends of the motor shaft (11) are respectively inserted into the outside of the support sleeve (4). A shaft sleeve (5) is respectively provided at both ends of the motor shaft (11). The spline assembly includes a bearing seat (2), a spline sleeve (1) and a spherical roller bearing (3). The connecting ends of the motor shaft (11) are respectively inserted into the spline sleeve (1). A cavity (13) is left between the connecting ends of the motor shaft (11). The bearing seat (2) is fixed on the inner wall of the motor housing. A spherical roller bearing (3) is provided between the bearing seat (2) and the spline sleeve (1).

2. The segmented assembled submersible permanent magnet synchronous motor according to claim 1, characterized in that: The motor section comprises a motor head section (18), a motor middle section (19) and a motor tail section (20), and the three have the same structure. The motor head section (18) is connected to the motor head (22), the end of the motor head (22) is provided with a transport cap (21) fixed by bolts, and the motor tail section (20) is connected to the motor tail section (20).

3. The segmented assembled submersible permanent magnet synchronous motor according to claim 2, characterized in that: The number of the motor intermediate section (19) is at least one.

4. The segmented assembled submersible permanent magnet synchronous motor according to claim 2, characterized in that: A magnetic steel assembly (7) is provided in the circumferential direction of the motor shaft (11), a stainless steel tube (9) is provided on the outer side of the magnetic steel assembly (7), a stator sheet (8) is provided on the inner wall of the single-section housing (6), a motor winding (10) is provided on the stator sheet (8), the motor windings (10) are connected by motor leads (12), and a wire hole (14) for the motor lead (12) to pass through is provided on the bearing seat (2).

5. The segmented assembled submersible permanent magnet synchronous motor according to claim 1, characterized in that: An inner boss (15) is provided in the circumferential direction of the spline sleeve (1), an outer boss (16) is provided in the circumferential direction of the bearing seat (2), the outer ring of the spherical roller bearing (3) abuts against the outer boss (16), and the inner ring of the spherical roller bearing (3) abuts against the inner boss (15).

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