Self-centering anti-rotation bearing of submersible motor

Abstract

The utility model discloses a self-centering anti-rotation bearing of a submersible motor, which relates to the technical field of bearings, and comprises a bearing body, a micro rotor, telescopic top blocks and a taper sleeve, the taper sleeve is inserted on the end face of the bearing body, a plurality of telescopic top blocks are movably inserted in the circumferential direction of the bearing body, and the inner ends of the telescopic top blocks are contacted with the external conical surface of the taper sleeve. The two micro rotors are located at the two ends of the taper sleeve correspondingly and connected to the bearing body through threads, the micro rotors rotate to push the taper sleeve to displace, and then the telescopic ejector block displaces in the radial direction of the bearing body. Coaxiality of the stator and the rotor of the submersible motor can be improved, unilateral magnetic pulling force to the rotor caused by eccentricity of the stator and the rotor is reduced, operation stability of the motor is improved, radial load of the bearing is reduced, and efficiency and service life of the motor are further improved. Meanwhile, the method has great significance in research and development of improving the power density and the torque density of the submersible motor.

Description

Technical Field

[0001] The utility model relates to the technical field of bearings, in particular to a self-centering anti-rotation bearing for a submersible motor. Background Art

[0002] Submersible motor driven centrifugal pump or screw pump oil production technology has been widely used in major oil fields. The inner diameter of the oil well casing is generally small. In order to obtain sufficient torque, submersible motors are designed as slender structures with long length and small diameter. The rotor can be up to 10 meters long. In order to avoid sweeping, multiple bearings are set on the rotor.

[0003] Since the rotor is slender and has many bearings, in order to smoothly install the rotor into the stator, there is a large gap between the outer diameter of the rotor bearing and the inner hole of the stator, which causes a certain offset between the rotor axis and the stator axis, and the air gap length is unevenly distributed. When the rotor rotates, it is subjected to a large unilateral magnetic pull, the motor running stability decreases, and the radial force borne by the bearing increases sharply. Therefore, how to improve the power density and torque density of the submersible motor is a key research problem for technicians in this field. Utility Model Content

[0004] The utility model aims to provide a self-centering anti-rotation bearing for a submersible motor, so as to solve the problems existing in the prior art and improve the coaxiality of the stator and rotor of the submersible motor.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a self-centering anti-rotation bearing for a submersible motor, comprising a bearing body, a micro-rotor, a retractable top block and a tapered sleeve, wherein the tapered sleeve is inserted into the end surface of the bearing body, and a plurality of retractable top blocks are circumferentially movably inserted, the inner end of the retractable top block contacts the tapered surface of the outer portion of the tapered sleeve, two micro-rotors are respectively located at the two ends of the tapered sleeve and are both connected to the bearing body by threads, and the rotation of the micro-rotor can push the tapered sleeve to be displaced, thereby causing the retractable top block to be displaced along the radial direction of the bearing body.

[0007] Preferably, the bearing body is in a convex U-shaped structure with a protrusion in the middle, the tapered sleeve is inserted into the middle protrusion of the bearing body, and the insertion holes of the tapered sleeve are all arranged on the outer periphery of the center sleeve of the bearing body.

[0008] Preferably, two ends of the bearing body are respectively clamped with a limit ring, and the limit ring is used to limit the displacement of the micro-rotor.

[0009] Preferably, one end of the tapered sleeve is a circular ring, and the other end has a plurality of teeth evenly distributed along the circumference. The outer surface of the tapered sleeve is a conical surface, and the inner surface is a cylindrical surface, and the cylindrical surface matches the center sleeve of the bearing body.

[0010] Preferably, the micro-rotor comprises a micro-rotor ring and a permanent magnet, a plurality of arc-shaped permanent magnets are evenly inserted into the annular groove of the micro-rotor ring, the permanent magnets are spliced ​​into a circular ring, and an end cover is welded to the port of the annular groove.

[0011] Preferably, the N pole and the S pole of the permanent magnet are arranged adjacent to each other, and the magnetic pole of the permanent magnet is the same as the magnetic pole of the motor rotor.

[0012] Preferably, the retractable top block is a stepped shaft, and the stepped shaft is inserted into a stepped hole on the bearing body.

[0013] Preferably, the small end of the stepped shaft is located outside and has a length greater than the length of the small hole in the stepped hole, and the large end of the stepped shaft is provided with an arc surface matching the conical surface of the tapered sleeve.

[0014] Preferably, the maximum outer diameter of the bearing body is 0.2 mm to 0.3 mm smaller than the inner diameter of the assembly.

[0015] Preferably, a copper sleeve is sleeved inside the center sleeve of the bearing body, and the center sleeve and the copper sleeve are clearance-matched.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model can improve the coaxiality of the stator and rotor of the submersible motor, reduce the unilateral magnetic pulling force on the rotor caused by the eccentricity of the stator and rotor, improve the running stability of the motor and reduce the radial load of the bearing, thereby improving the efficiency and life of the motor; at the same time, it is of great significance in the research and development of improving the power density and torque density of the submersible motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the explosion structure of the self-centering anti-rotation bearing of the submersible motor in the embodiment of the utility model;

[0020] Figure 2 It is a schematic diagram of the assembly structure of the self-centering anti-rotation bearing of the submersible motor in the embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of the end surface structure of the self-centering anti-rotation bearing of the submersible motor in the embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of the cross-sectional structure of the self-centering anti-rotation bearing of the submersible motor in the embodiment of the utility model;

[0023] Among them: 1-limiting retaining ring, 2-micro rotor, 3-bearing body, 4-retractable top block, 5-cone sleeve, 6-copper sleeve, 11-micro rotor ring, 12-permanent magnet. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model aims to provide a self-centering anti-rotation bearing for a submersible motor, so as to solve the problems existing in the prior art and improve the coaxiality of the stator and rotor of the submersible motor.

[0026] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] like Figures 1 to 4 As shown: This embodiment provides a self-centering anti-rotation bearing for a submersible motor, comprising a bearing body 3, a micro-rotor 2, a retractable top block 4 and a tapered sleeve 5. The tapered sleeve 5 is inserted on the end surface of the bearing body 3, and a plurality of retractable top blocks 4 are circumferentially movably inserted. The inner end of the retractable top block 4 is in contact with the conical surface of the outer side of the tapered sleeve 5. Two micro-rotors 2 are respectively located at the two ends of the tapered sleeve 5 and are both connected to the bearing body 3 through threads. The rotation of the micro-rotor 2 can push the tapered sleeve 5 to move, thereby causing the retractable top block 4 to move along the radial direction of the bearing body 3.

[0028] As an optional solution, in this embodiment, the bearing body 3 is a convex-shaped structure with a protrusion in the middle, and the tapered sleeve 5 is plugged into the middle protrusion of the bearing body 3. The plugging holes of the tapered sleeve 5 are all arranged on the outer circumference of the center sleeve of the bearing body 3. A plurality of plugging holes and oil holes for installing the telescopic block are opened in the circumferential direction of the middle protrusion of the bearing body 3, and the oil holes and the plugging holes are staggered.

[0029] As an optional solution, in this embodiment, a limit ring 1 is respectively clamped at both ends of the bearing body 3, and the limit ring 1 can contact the inner ring of the micro rotor 2 to limit the maximum displacement of the micro rotor 2 on the corresponding side.

[0030] As an optional solution, in this embodiment, one end of the tapered sleeve 5 is a circular ring, and the other end is evenly distributed with a plurality of insert teeth along the circumferential direction. The outer surface of the tapered sleeve 5 is a conical surface, and the inner surface is a cylindrical surface, and the cylindrical surface matches the center sleeve of the bearing body 3. When the tapered sleeve 5 moves left and right along the bearing axis, the multiple retractable blocks on the outer circle of the bearing can move synchronously along the radial direction of the bearing to achieve centering expansion and exit from the expansion state.

[0031] As an optional solution, the micro-rotor 2 in this embodiment includes a micro-rotor ring 11 and a permanent magnet 12. A plurality of arc-shaped permanent magnets 12 are evenly inserted in the annular groove of the micro-rotor ring 11. All the permanent magnets 12 can be spliced ​​into a circular ring. The annular groove is located on the end surface of the micro-rotor ring 11 and is opened along the axial direction of the micro-rotor ring 11. An end cap is welded to the end of the annular groove to seal and fix the permanent magnet 12. In this embodiment, the micro-rotor 2 can be driven to rotate by the magnetic field of the motor stator to realize the axial movement of the cone sleeve 5. The cone sleeve 5 drives the retractable top block 4 to make the bearing concentric with the inner hole of the stator.

[0032] As an optional solution, in this embodiment, the N pole and the S pole of the permanent magnet 12 are arranged adjacent to each other, and the magnetic pole of the permanent magnet 12 is the same as the magnetic pole of the motor rotor. In this embodiment, the outer side of the micro rotor 2 is provided with magnetic poles consistent with the motor rotor, or other magnetic poles that can match the performance of the motor stator. After the motor stator is powered on, the micro rotor 2 can rotate clockwise and counterclockwise, thereby pushing the cone sleeve 5 to move left and right along the bearing axis.

[0033] As an optional solution, the telescopic top block 4 in this embodiment is a stepped shaft, which is inserted into the stepped hole on the bearing body 3. In this embodiment, the coaxiality of the stator and rotor and the anti-rotation of the bearing are achieved through the radial synchronous telescoping of multiple telescopic top blocks 4; the outer end surface of the telescopic top block 4 can be a plane, an arc surface or a hemispherical surface, preferably a hemispherical surface, which has a simple processing technology and is easy to achieve contact matching.

[0034] As an optional solution, the small end of the stepped shaft in this embodiment is located outside and its length is greater than the length of the small hole in the stepped hole, and the large end of the stepped shaft is provided with an arc surface matching the conical surface of the tapered sleeve 5. This embodiment minimizes the matching clearance between the inner hole of the stator and the outer circle of the bearing, which is increased in order to adapt to the rotor assembly of the traditional submersible motor, and ensures the coaxiality of the stator and rotor to the greatest extent, thereby reducing the unilateral magnetic pull on the rotor caused by the eccentricity of the stator and rotor, effectively improving the running stability of the motor and reducing the radial load of the bearing, thereby improving the efficiency and life of the motor; and compared with the traditional submersible motor bearing, the outer dimensions have not changed significantly, and most submersible motors can be directly replaced in parallel or slightly modified with the dimensions of the parts adjacent to the bearing.

[0035] As an optional solution, in this embodiment, the maximum outer diameter of the bearing body 3 is 0.2mm-0.3mm smaller than the inner diameter of the assembly. The displacement of the retractable top block 4 that can protrude from the bearing body 3 is at least 0.2mm-0.3mm, so that the outer end of the retractable top block 4 can collide with the motor stator, ensuring the coaxiality of the motor stator and the rotor and the anti-rotation effect of the bearing.

[0036] As an optional solution, in this embodiment, a copper sleeve 6 is sleeved inside the center sleeve of the bearing body 3, and the center sleeve and the copper sleeve 6 are clearance-matched so that the inner surface of the bearing body 3 and the outer surface of the copper sleeve 6 rotate relative to each other, forming a friction pair.

[0037] The self-centering anti-rotation bearing of the submersible motor of this embodiment, taking the submersible motor as an example, the specific assembly and use process is as follows:

[0038] like Figure 1 As shown, when the submersible motor is assembled, the two micro-rotors 2 are rotated to the right, the cone sleeve 5 is in a withdrawn state, the retractable top block 4 is retracted into the bearing body 3, the maximum outer diameter of the bearing body 3 is smaller than the inner diameter of the stator of the submersible motor, and the rotor of the submersible motor can be smoothly installed in the stator of the submersible motor; after the submersible motor is assembled, it is powered on, and the appropriate rotation direction is adjusted. Under the action of the magnetic field of the stator of the submersible motor, the two micro-rotors 2 move to the left, and the micro-rotor 2 on the left rotates to contact with the limit ring 1 on the left and stops and stays at this position. When the micro-rotor 2 on the right rotates, it pushes the cone sleeve 5 to move to the left, and the retractable top block 4 is pushed out by the cone sleeve 5 until the diameter of the multi-point circle formed by the outer ends of multiple retractable top blocks 4 increases to be consistent with the inner hole of the stator of the submersible motor, the axis of the bearing body 3 is coaxial with the axis of the stator, and at the same time, the friction between the retractable top block 4 and the inner hole of the stator makes it remain relatively still with the inner hole of the stator after adaptively changing its diameter, so as to prevent the bearing body 3 and the inner hole of the stator from rotating relative to each other.

[0039] When it is necessary to remove the rotor of the submersible motor, power on the submersible motor and adjust the appropriate (opposite) rotation direction. Under the action of the stator magnetic field of the submersible motor, the two micro-rotors 2 move to the right. The micro-rotor 2 on the right rotates until it contacts the limit ring 1 on the right and stops and stays at this position. The micro-rotor 2 on the left rotates and pushes the cone sleeve 5 to move to the right. The cone sleeve 5 is withdrawn, and a gap appears between the retractable top block 4 and the inner hole of the stator. The rotor of the submersible motor can be pulled out normally.

[0040] According to this embodiment, during the motor assembly process, when the rotor is installed in the stator, the retractable top block 4 is in a contracted state, the bearing and the inner hole of the stator are in a gap state, and the rotor can be smoothly installed; after the motor is assembled, the motor is powered on, the rotation direction of the rotor is adjusted, the micro-rotors 2 on both sides of the bearing rotate with the magnetic field of the motor stator, and the cone sleeve 5 is pressed to move to one side to eject the retractable top block 4 synchronously, and the outer ends of multiple retractable top blocks 4 form a multi-point circular structure larger than the outer diameter of the bearing body 3, so that the stator and rotor axes are coaxial, and at the same time, the friction force formed by the retractable top block 4 and the inner hole of the stator can prevent the bearing from rotating relative to the stator.

[0041] The submersible motor self-centering anti-rotation bearing structure of this embodiment can be used for assembly on submersible motors, which can minimize the matching clearance between the stator inner hole and the bearing outer circle that is increased in order to adapt to the rotor assembly of the traditional submersible motor, and maximize the coaxiality of the stator and the rotor, thereby reducing the unilateral magnetic pull on the rotor caused by the eccentricity of the stator and the rotor, effectively improving the running stability of the motor and reducing the radial load of the bearing, thereby improving the efficiency and life of the motor. Compared with the traditional submersible motor bearings, the external dimensions have not changed significantly, and most submersible motors can be directly replaced in parallel or slightly modified with the dimensions of the parts adjacent to the bearings.

[0042] This specification uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A self-centering anti-rotation bearing for a submersible motor, characterized in that: It includes a bearing body, a micro-rotor, a retractable top block and a tapered sleeve. The tapered sleeve is inserted on the end surface of the bearing body, and a plurality of retractable top blocks are circumferentially movably inserted. The inner end of the retractable top block contacts the conical surface of the outer side of the tapered sleeve. Two micro-rotors are respectively located at the two ends of the tapered sleeve and are both connected to the bearing body through threads. The rotation of the micro-rotor can push the tapered sleeve to move, thereby causing the retractable top block to move radially along the bearing body.

2. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: The bearing body is in a convex structure with a protrusion in the middle, the tapered sleeve is plugged into the middle protrusion of the bearing body, and the plugging holes of the tapered sleeve are all arranged on the outer periphery of the center sleeve of the bearing body.

3. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: A limit ring is respectively clamped at both ends of the bearing body, and the limit ring is used to limit the displacement of the micro rotor.

4. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: One end of the tapered sleeve is a circular ring, and the other end is evenly distributed with a plurality of insert teeth along the circumferential direction. The outer surface of the tapered sleeve is a conical surface, and the inner surface is a cylindrical surface. The cylindrical surface matches the center sleeve of the bearing body.

5. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: The micro-rotor comprises a micro-rotor ring and a permanent magnet. A plurality of arc-shaped permanent magnets are evenly inserted in the annular groove of the micro-rotor ring. The permanent magnets are spliced ​​into a circular ring. An end cover is welded to the end of the annular groove.

6. The self-centering anti-rotation bearing for a submersible motor according to claim 5, characterized in that: The N pole and the S pole of the permanent magnet are arranged adjacent to each other, and the magnetic pole of the permanent magnet is the same as the magnetic pole of the motor rotor.

7. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: The telescopic top block is a stepped shaft, and the stepped shaft is inserted into the stepped hole on the bearing body.

8. The self-centering anti-rotation bearing for a submersible motor according to claim 7, characterized in that: The small end of the stepped shaft is located outside and has a length greater than the length of the small hole in the stepped hole. The large end of the stepped shaft is provided with an arc surface matching the conical surface of the conical sleeve.

9. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: The maximum outer diameter of the bearing body is 0.2 mm to 0.3 mm smaller than the inner diameter of the assembly.

10. The self-centering anti-rotation bearing for a submersible motor according to claim 1, characterized in that: A copper sleeve is sleeved inside the center sleeve of the bearing body, and the center sleeve and the copper sleeve are in clearance fit.

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