Low speed permanent magnet submersible motor with anti-lubricant shedding bearing

Abstract

The low-speed permanent magnet submersible motor with the bearing preventing the lubricating material from falling off relates to the technical field of oil exploitation motors, and comprises a shell, a stator core fixedly connected in the shell, a rotating shaft rotatably arranged in the stator core, a copper-based lubricating bearing fixed on the rotating shaft, a bearing retainer fixedly arranged in the stator core, the copper-based lubricating bearing located inside the bearing retainer, and a plurality of self-lubricating bodies arranged along the axial direction and surrounding the outer ring of the copper-based lubricating bearing, the self-lubricating bodies being in frictional contact with the inner ring of the bearing retainer. The utility model solves the problem that in the traditional technology, the self-lubricating material is prone to falling out in the radial direction due to the vibration of the unit during operation, the lubricating material of the bearing is lost, the lubricating performance is reduced, and the service life of the bearing is affected.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction motor technology, specifically to a low-speed permanent magnet submersible motor with bearings that prevent lubricating material from falling off. Background Technology

[0002] The submersible motor employs a multi-stage bearing support system to adapt to its slender structural characteristics during operation. Bearing lubrication relies on the centrifugal force generated by the high-speed rotation of the rotor. This centrifugal force ejects lubricating oil to lubricate the bearing's wear surfaces, ensuring bearing life. The motor's operating speed range is 2900 rpm to 3000 rpm. Low-speed permanent magnet motors have a low rotational speed, ranging from 50 rpm to 300 rpm, which is less than one-tenth the speed of a typical submersible oil motor. The reduced speed significantly decreases the centrifugal force generated by the rotor. The lubricating oil propelled by centrifugal force alone is no longer sufficient for adequate lubrication, leading to accelerated bearing wear and a shortened service life.

[0003] To address the reduced bearing lubrication performance caused by decreased rotational speed, a self-lubricating material is added to the bearing to enhance its lubrication. To increase the contact rate of the self-lubricating material during bearing rotation, a multi-point, staggered arrangement of the lubricating material is employed.

[0004] A prior art patent with publication number CN119210017A discloses a housing containing a stator core fixed inside. A rotating shaft rotatably houses the stator core, and a copper-based lubricated bearing is fixed on the shaft. A bearing cage is also fixed inside the stator core. The inner ring of the bearing cage makes frictional contact with the outer ring of the copper-based lubricated bearing, and the outer ring of the copper-based lubricated bearing has several self-lubricating bodies evenly distributed on it. This invention solves the problems of traditional permanent magnet submersible motors failing to provide lubrication for the mating pairs at low speeds of 100-300 rpm; water pooling and accumulating at cable connectors, causing insulation failure at the cable connectors; and the easy rubbing or entanglement of the motor leads with the rotating rotor shaft during installation.

[0005] With use, existing devices, including those mentioned above, have gradually revealed shortcomings in this technology, mainly in the following aspects: During operation, self-lubricating materials can easily detach radially due to vibrations in the unit, resulting in a lack of lubricating material in the bearing, reduced lubrication performance, and consequently affecting the bearing's service life.

[0006] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0007] In view of the shortcomings of the existing technology, this utility model solves the problem that in the traditional technology, the self-lubricating material is easily detached radially due to vibration of the unit during operation, resulting in the lack of lubricating material in the bearing, reduced lubrication performance, and thus affecting the service life of the bearing.

[0008] To solve the above problems, this utility model provides the following technical solution: A low-speed permanent magnet submersible motor with bearings designed to prevent lubricant from falling off includes a housing, a stator core fixedly mounted inside the housing, a rotating shaft rotatably mounted inside the stator core, a copper-based lubricated bearing fixed on the rotating shaft, a bearing cage fixed inside the stator core, the copper-based lubricated bearing located inside the bearing cage, and a plurality of self-lubricating bodies mounted axially around the outer ring of the copper-based lubricated bearing, the self-lubricating bodies being in frictional contact with the inner ring of the bearing cage.

[0009] As an optimized solution, the outer ring of the copper-based lubricated bearing has an axially extending mounting groove corresponding to each of the self-lubricating bodies, and the two ends of the mounting groove penetrate through both ends of the copper-based lubricated bearing.

[0010] As an optimized solution, the mounting groove is provided with a slot that penetrates the outer ring of the copper-based lubricated bearing, and the sidewall of the self-lubricating body extends out of the slot and makes frictional contact with the inner ring of the bearing cage.

[0011] As an optimized solution, the self-lubricating body is cylindrical, and the width of the groove is smaller than the diameter of the self-lubricating body.

[0012] As an optimized solution, magnetic steel components are fixed on both sides of the rotating shaft at the positions of the copper-based lubricated bearing.

[0013] As an optimized solution, the two ends of the copper-based lubricated bearing are respectively abutted against the ends of the magnet component by buffer pads.

[0014] As an optimized solution, the rotating shaft is provided with a key along the axial direction, and the inner ring of the copper-based lubricated bearing is provided with a keyway that matches the key.

[0015] Compared with the prior art, the beneficial effects of this utility model are: The embedding direction of the self-lubricating material is changed to axial embedding. After the outer circle of the process is machined, an appropriate amount of self-lubricating material is exposed. When the bearing rotates, the self-lubricating material is always between the two pairs of grinding surfaces, playing a lubricating role. Because of the enclosing effect of the embedding circle, the self-lubricating material will not vibrate and fall out in the radial direction. Moreover, the entire strip of self-lubricating material runs through the bearing, covering all working surfaces. There is no possibility of missing self-lubricating material or incomplete coverage when the bearing is working, thus ensuring the reliability of the bearing. The self-lubricating material is prevented from axially dislodging by buffer pads at both ends of the copper-based lubricated bearing against the ends of the magnet component. The assembly of the components shown in the figure ensures that the self-lubricating material is reliably fixed axially. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0017] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the self-lubricating body of this utility model.

[0018] In the diagram: 1-Stator core; 2-Key; 3-Bearing cage; 4-Self-lubricating body; 5-Copper-based lubricated bearing; 6-Buffer pad; 7-Magnetic steel component; 8-Shaft. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0020] like Figure 1 and Figure 2 As shown, a low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off includes a housing, a stator core 1 fixed inside the housing, a rotating shaft 8 rotatably mounted inside the stator core 1, a copper-based lubricated bearing 5 fixed on the rotating shaft 8, a bearing cage 3 fixed inside the stator core 1, the copper-based lubricated bearing 5 located inside the bearing cage 3, and a plurality of self-lubricating bodies 4 mounted axially around the outer ring of the copper-based lubricated bearing 5, which are in frictional contact with the inner ring of the bearing cage 3.

[0021] The outer ring of the copper-based lubricated bearing 5 has an axially extending mounting groove corresponding to each self-lubricating body 4, and the two ends of the mounting groove pass through the two ends of the copper-based lubricated bearing 5.

[0022] The mounting groove has a slot that penetrates the outer ring of the copper-based lubricated bearing 5. The side wall of the self-lubricating body 4 extends out of the slot and makes frictional contact with the inner ring of the bearing cage 3.

[0023] The self-lubricating body 4 is cylindrical, and the width of the groove is smaller than the diameter of the self-lubricating body 4.

[0024] Magnet components 7 are fixed on both sides of the rotating shaft 8, which is located on the copper-based lubricated bearing 5.

[0025] The two ends of the copper-based lubricated bearing 5 are respectively abutted against the ends of the magnet component 7 through buffer pads 6.

[0026] The rotating shaft 8 is provided with a key 2 along the axial direction, and the inner ring of the copper-based lubricated bearing 5 is provided with a key 2 groove that matches the key 2.

[0027] The working principle of this device is as follows: The bearing cage 3 is positioned within the inner hole of the stator core 1. The copper-based lubricated bearing 5 is fixed to the rotating shaft 8 via a key 2. The copper-based lubricated bearing 5 and the bearing cage 3 work as a counter-grinding pair. The buffer pad 6 is located between the copper-based lubricated bearing 5 and the magnet component 7. Through the assembly relationship, both sides of the copper-based lubricated bearing 5 are equipped with magnet components 7. During operation, the copper-based lubricated bearing 5 is in a relatively stationary state, and the self-lubricating body 4 embedded on it is also relatively stationary, thus preventing any possibility of axial movement. The embedding direction of the self-lubricating material is changed to axial embedding. After the outer circle of the process is machined, an appropriate amount of self-lubricating material is exposed. When the bearing rotates, the self-lubricating material is always between the two pairs of grinding surfaces to play a lubricating role. Because of the wrapping effect of the embedding circle, the self-lubricating material will not vibrate and fall out in the radial direction. Moreover, the entire strip of self-lubricating material runs through the bearing and covers all working surfaces. When the bearing is working, there will be no possibility of missing self-lubricating material or incomplete coverage. Therefore, the reliability of the bearing is guaranteed. The two ends of the copper-based lubricated bearing 5 are respectively abutted against the ends of the magnet component 7 by buffer pads 6, which prevents the self-lubricating material from axially dislodging. The assembly of the components shown in the figure ensures that the self-lubricating material is reliably fixed axially.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, characterized in that: The device includes an outer shell, a stator core (1) is fixed inside the outer shell, a rotating shaft (8) is rotatably provided inside the stator core (1), a copper-based lubricated bearing (5) is fixed on the rotating shaft (8), a bearing cage (3) is fixed inside the stator core (1), the copper-based lubricated bearing (5) is located inside the bearing cage (3), and a plurality of self-lubricating bodies (4) are provided around the outer ring of the copper-based lubricated bearing (5) and are installed along the axial direction. The self-lubricating bodies (4) are in frictional contact with the inner ring of the bearing cage (3).

2. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 1, is characterized in that: The outer ring of the copper-based lubricated bearing (5) has an axially extending mounting groove corresponding to each of the self-lubricating bodies (4), and the two ends of the mounting groove penetrate through the two ends of the copper-based lubricated bearing (5).

3. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 2, is characterized in that: The mounting groove has a slot that penetrates the outer ring of the copper-based lubricated bearing (5), and a portion of the sidewall of the self-lubricating body (4) extends out of the slot and rubs against the inner ring of the bearing cage (3).

4. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 3, is characterized in that: The self-lubricating body (4) is cylindrical, and the width of the groove is smaller than the diameter of the self-lubricating body (4).

5. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 1, is characterized in that: The rotating shaft (8) is fixed with magnetic steel components (7) on both sides of the copper-based lubricated bearing (5).

6. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 5, is characterized in that: The two ends of the copper-based lubricated bearing (5) abut against the ends of the magnet component (7) through buffer pads (6).

7. The low-speed permanent magnet submersible motor with bearings designed to prevent lubricating material from falling off, as described in claim 1, is characterized in that: The rotating shaft (8) is provided with a key (2) along the axial direction, and the inner ring of the copper-based lubricated bearing (5) is provided with a keyway that matches the key (2).

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