Submersible motor

Abstract

The utility model relates to the technical field of submersible motors, and discloses a submersible motor which comprises a shell, a rotor, a stator core, a winding and a hollow pipe. The shell is provided with a containing cavity, and oil liquid is arranged in the containing cavity. The rotor is arranged in the containing cavity. The stator iron core is arranged in the containing cavity, the rotor is sleeved with the stator iron core, the stator iron core is provided with a stator groove, and the stator groove extends from one end of the stator iron core to the other end of the stator iron core in the axial direction of the stator iron core. The winding passes through the stator slot. The hollow pipe is arranged in the stator groove in a penetrating mode, communicates with the containing cavity and can allow oil liquid to pass through. In this way, the heat dissipation effect of the winding can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of oil-submerged motors, and particularly to an oil-submerged motor. Background Art

[0002] An oil-submerged motor is a motor that can work immersed in an oil well at a specified depth. The oil-submerged motor can be submerged in an oil well hundreds to thousands of meters deep to continuously and reliably extract underground crude oil or well fluid.

[0003] The stator of the current oil-submerged motor includes a stator core and windings. The windings are wound in the stator slots of the stator core, and the stator slots are filled with paint liquid. After the paint liquid solidifies, the windings are fixed in the stator slots. The heat of the windings in the stator slots needs to be dissipated to the outside of the stator through the solidified paint liquid and the stator core, and the heat dissipation effect is poor. Summary of the Utility Model

[0004] In view of the problems in the background art, the purpose of the present application is to provide an oil-submerged motor, which overcomes or at least partially solves the above problems.

[0005] According to the first aspect of the present application, there is provided an oil-submerged motor, including: a housing, a rotor, a stator core, windings, and a hollow tube. The housing is provided with a receiving cavity, and the receiving cavity is filled with oil. The rotor is arranged in the receiving cavity. The stator core is arranged in the receiving cavity, the stator core is sleeved on the rotor, the stator core is provided with stator slots, and along the axial direction of the stator core, the stator slots extend from one end of the stator core to the other end of the stator core. The windings are threaded through the stator slots. The hollow tube is threaded through the stator slots, the hollow tube is communicated with the receiving cavity, and the hollow tube allows the oil to pass through.

[0006] In one or more of the above optional embodiments, a liquid passing groove is arranged on the outer peripheral wall of the stator core, and along the axial direction of the stator core, the liquid passing groove extends from one end of the stator core to the other end of the stator core. The liquid passing groove is communicated with the receiving cavity, and the liquid passing groove allows the oil to pass through.

[0007] In one or more of the above optional embodiments, the number of the stator cores is at least two, at least two stator cores are arranged in sequence along the axial direction, and the stator slots of two adjacent stator cores are respectively communicated. The windings and the hollow tube are respectively threaded through the stator slots of at least two stator cores.

[0008] In one or more of the above optional embodiments, a connecting seat is further included. The connecting seat is sleeved on the rotor, and two ends of the connecting seat are respectively connected to two adjacent stator cores. The connecting seat is provided with a communicating groove, and two ends of the communicating groove are respectively communicated with the stator grooves of two adjacent stator cores. The winding and the hollow tube respectively pass through the communicating groove.

[0009] In one or more of the above optional embodiments, a temperature sensor is further included. The temperature sensor is arranged in the stator groove.

[0010] In one or more of the above optional embodiments, the rotor includes a rotor shaft, a rotor core and a plurality of permanent magnets. The rotor core is sleeved on the rotor shaft, the plurality of permanent magnets are respectively arranged on the outer peripheral wall of the rotor core, and the stator core is sleeved outside the plurality of permanent magnets. The rotor shaft is provided with a liquid passing hole. Along the axial direction of the rotor shaft, the liquid passing hole extends from one end of the rotor shaft to the other end of the rotor shaft. The liquid passing hole is communicated with the accommodating cavity, and the liquid passing hole can allow the oil to pass through.

[0011] In one or more of the above optional embodiments, the number of the rotor cores is at least two. At least two rotor cores are sequentially arranged at intervals along the axial direction. A centering bearing is connected between every two adjacent rotor cores. The centering bearing is sleeved on the rotor shaft. A connecting hole is further arranged at the connection part of the rotor shaft and the centering bearing. One end of the connecting hole is communicated with the liquid passing hole, and the other end of the connecting hole extends along the radial direction of the rotor shaft to the outer peripheral wall of the rotor shaft.

[0012] In one or more of the above optional embodiments, the centering bearing includes an inner ring and an outer ring. The outer ring is sleeved on the inner ring, and the inner ring is sleeved on the rotor shaft. The inner ring is provided with a radial through hole, and the radial through hole extends from the inner peripheral wall of the inner ring to the outer peripheral wall of the inner ring.

[0013] In one or more of the above optional embodiments, the outer ring is provided with a liquid passing port and an axial through hole. The liquid passing port communicates the axial through hole and the radial through hole respectively. Along the axial direction of the centering bearing, the axial through hole extends from one end of the outer ring to the other end of the outer ring.

[0014] In one or more of the above optional embodiments, an impeller is further included and is arranged in the accommodating cavity. The impeller is connected to one end of the rotor shaft, and the impeller is used for driving the oil to enter the liquid passing hole.

[0015] The beneficial effect of the embodiment of the present application is: the submersible motor provided by the embodiment of the present application, by arranging a hollow tube with both ends connected to the accommodating cavity in the stator slot, when the hollow tube is filled with oil in the motor accommodating cavity, can allow the oil to flow through, and then the oil and the winding in the stator slot perform heat exchange, thereby improving the heat dissipation effect of the winding. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. 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 according to the actual scale.

[0017] Figure 1 A three-dimensional diagram of a submersible motor provided in an embodiment of the present application;

[0018] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of a submersible motor shown;

[0019] Figure 3 A schematic cross-sectional view of a stator core and winding of a submersible motor provided in an embodiment of the present application, cut along an axis perpendicular to the stator core;

[0020] Figure 4 for Figure 2 The enlarged view of point A in the middle;

[0021] Figure 5 A partial exploded view of a submersible motor provided in an embodiment of the present application;

[0022] Figure 6 A partial exploded view of a rotor of a submersible motor provided in an embodiment of the present application;

[0023] Figure 7 A schematic diagram of a rotor of a submersible motor provided in an embodiment of the present application with the pressure ring omitted;

[0024] Figure 8 for Figure 2 The enlarged view of point B in the middle;

[0025] Figure 9 An exploded view of a centering bearing of a submersible motor provided in an embodiment of the present application;

[0026] Figure 10 A schematic cross-sectional view of a submersible motor provided in an embodiment of the present application, cut along an axial direction perpendicular to the rotor shaft;

[0027] Figure 11 for Figure 1Another partial cross-sectional schematic diagram of a submersible motor shown;

[0028] Figure 12 is Figure 11 an enlarged view of part C in Specific embodiments

[0029] To facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration.

[0030] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not used to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0031] In the description of this specification, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0033] Please refer to Figure 1-3 , the submersible motor 1000 includes a housing 1, a rotor 3, a stator core 21 and a winding 22. The housing is provided with a receiving cavity a, and the rotor 3, the stator core 21 and the winding 22 are arranged in the receiving cavity a. The stator core 21 is sleeved on the rotor 3, the stator core 21 is provided with stator slots b, and along the axial direction of the stator core 21, the stator slots b extend from one end of the stator core 21 to the other end of the stator core 21. The winding 22 passes through the stator slots b.

[0034] In some embodiments, there is oil fluid (not shown in the figure) in the accommodation cavity a. The oil fluid is used to lubricate and dissipate heat for the components in the housing 1.

[0035] In some embodiments, the submersible motor 1000 includes a hollow tube 4. The hollow tube 4 is disposed through the stator slot b, and the hollow tube 4 communicates with the accommodation cavity a. The hollow tube 4 allows the oil fluid in the accommodation cavity a to pass through.

[0036] For the submersible motor 1000 provided by the embodiments of the present application, by providing the hollow tube 4 communicating with the accommodation cavity a in the stator slot b, the hollow tube 4 can allow the oil fluid to flow through, and then the oil fluid exchanges heat with the winding 22 in the stator slot b, improving the heat dissipation effect of the winding 22.

[0037] It can be understood that the number of stator slots b can be set according to actual needs. Exemplarily, in some embodiments, the number of stator slots b is twelve, and the twelve stator slots b are arranged at equal intervals around the axis of the stator core 21.

[0038] In some embodiments, along the axial direction of the stator core 21, both ends of the hollow tube 4 protrude from the stator core 21 through the through-holes at both ends of the stator slot b in the stator core 21.

[0039] In some embodiments, the stator slot b is filled with an insulating material. The insulating material can provide an additional insulating layer to prevent short circuits between windings 22 and short circuits between the winding 22 and the ground. The insulating material 23 can also play a role in fixing the winding 22 and the hollow tube 4.

[0040] In some embodiments, the insulating material filled in the stator slot b is paint liquid, and the insulating material is filled into the stator slot b by an impregnation process.

[0041] It can be understood that the composition and ratio of the paint liquid material can be selected according to the actual situation, and can be selected and matched according to the required properties such as insulation, high temperature resistance, and corrosion resistance.

[0042] In some embodiments, the impregnation process includes winding the winding 22 in the stator slot b according to the specified number of turns and arrangement, and threading a preset number of hollow tubes 4 in the stator slot b; using a filler to block both ends of the hollow tube 4; preheating the stator core 21 to a specific temperature to reduce the viscosity of the paint liquid and improve its fluidity; immersing the stator core 21 in a paint liquid tank, and the paint liquid fills the gaps between the stator slot b, the winding 22, and the hollow tube 4 through impregnation and capillary action; curing the impregnated stator core 21 at a specified temperature and time, and removing the fillers at both ends of the hollow tube 4 so that the openings at both ends of the hollow tube 4 communicate with the accommodation cavity a respectively.

[0043] In some embodiments, the hollow tube 4 is made of an insulating material.

[0044] In some embodiments, the hollow tube 4 includes, but is not limited to, being made of polytetrafluoroethylene.

[0045] In some embodiments, the number of the hollow tubes 4 is multiple. It can be understood that the number and the aperture size of the hollow tubes 4 can be selected according to the actual situation.

[0046] Please refer to Figure 2 and Figure 3 , in some embodiments, an oil passing groove 21a is provided on the outer peripheral wall of the stator core 21. Along the axial direction of the stator core 21, the oil passing groove 21a extends from one end of the stator core 21 to the other end of the stator core 21. The oil passing groove 21a is communicated with the accommodating cavity a, and the oil passing groove 21a can allow oil to pass through, so as to improve the heat dissipation effect of the stator core 21.

[0047] Please refer to Figure 2-4 , in some embodiments, the number of the stator cores 21 is at least two, and the at least two stator cores 21 are arranged in sequence along the axial direction. The stator slots b of two adjacent stator cores 21 are respectively communicated. The winding 22 and the hollow tube 4 respectively pass through the stator slots b of each stator core 21. When the submersible motor 1000 works, the oil in the accommodating cavity a can flow through the hollow tube 4 and through the inside of each stator core 21 arranged in sequence along the axial direction of the stator core 21 to take away heat.

[0048] Please refer to Figure 2-5 , in some embodiments, the submersible motor 1000 further includes a connecting seat 23. The connecting seat 23 is sleeved on the rotor 3, and two ends of the connecting seat 23 are respectively connected to two adjacent stator cores 21. The connecting seat 23 is provided with a communicating groove c, and two ends of the communicating groove c are respectively communicated with the stator slots b of two adjacent stator cores 21. The winding 22 and the hollow tube 4 respectively pass through the communicating groove c.

[0049] In some embodiments, the connecting seat 23 is provided with a plurality of communicating grooves c corresponding to a plurality of stator slots b one by one. Two ends of the communicating groove c communicate the stator slots b of two adjacent stator cores 21 one by one. The winding 22 is wound around the stator core group formed by the stator cores 21 and the connecting seat 23 through the stator slots b and the communicating grooves c.

[0050] In some embodiments, the connecting seat 23 is filled with the aforementioned insulating material filled in the stator slots b.

[0051] Please refer to Figure 3 , in some embodiments, the submersible motor 1000 further includes a temperature sensor (not shown in the figure). The temperature sensor is arranged in the stator slot b. The temperature sensor is used to collect the temperature in the stator slot b, so as to be able to provide temperature data for monitoring the temperature conditions of the stator core 21 and the winding 22.

[0052] In some embodiments, the submersible motor further includes a cable 10 disposed in the stator slot b. One end of the cable 10 is connected to the temperature sensor, and the other end of the cable 10 extends out of the stator core 21 through the through-hole at the end of the stator core 21 via the stator slot b for electrical connection to other devices.

[0053] Please refer to Figure 1 、 Figure 2 and Figure 4 , in some embodiments, the rotor 3 includes a rotor shaft 31 and a rotor core 32. The rotor core 32 is sleeved on the rotor shaft 31.

[0054] In some embodiments, the housing 1 includes a main body 11, a first joint 12, and a second joint 13. The accommodating cavity a is disposed in the main body 11. The accommodating cavity a has a first mounting opening (not shown in the figure) formed at the first end of the main body 11. The first joint 12 is disposed at the first mounting opening, and the first joint 12 closes the first mounting opening. The accommodating cavity a has a second mounting opening (not shown in the figure) formed at the second end of the main body 11. The second joint 13 is disposed at the second mounting opening, and the second joint 13 closes the second mounting opening. The first end of the rotor shaft 31 is connected to the first joint 12, and the second end of the rotor shaft 31 is connected to the second joint 13.

[0055] In some embodiments, at least two stator cores 21 are sequentially arranged along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31. In the present application, the direction X is parallel to the axis of the rotor shaft 31.

[0056] In some embodiments, the stator core 21 is generally cylindrical. Along the direction X, a first cavity (not shown in the figure) with both ends open is formed by enclosing the inner peripheral wall of the stator core 21. The openings at both ends of the first cavity are a first opening and a second opening respectively.

[0057] In some embodiments, the rotor core 32 is generally cylindrical. Along the direction X, a second cavity (not shown in the figure) with both ends open is formed by enclosing the inner peripheral wall of the rotor core 32. The openings at both ends of the second cavity are a third opening and a fourth opening respectively. The rotor core 32 is disposed in the first cavity, and the rotor shaft 31 passes through the second cavity. The axes of the stator core 21, the rotor core 32, and the rotor shaft 31 coincide.

[0058] Please refer to Figure 1 and Figure 5, in some embodiments, along the direction X, a first shaft end retaining ring 6 is provided on one side of the stator core 21 arranged at the head end facing the first joint 12, and a second shaft end retaining ring (not shown in the figure) is provided on one side of the stator core 21 arranged at the tail end facing the second joint 13. The first shaft end retaining ring 6 and the second shaft end retaining ring are used to clamp the stator core 21 therebetween to prevent the stator core 21 from moving in the direction along the axis of the rotor shaft 31.

[0059] Please refer to Figure 2 , Figure 3 and Figure 6 , in some embodiments, the rotor 3 further includes a first rotor end ring 33 and a second rotor end ring 34. Each rotor core 32 is correspondingly provided with a first rotor end ring 33 and a second rotor end ring 34. The first rotor end ring 33 and the second rotor end ring 34 are sleeved on the rotor shaft 31. Along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31, the first rotor end ring 33 and the second rotor end ring 34 are located on opposite sides of the rotor core 32.

[0060] In some embodiments, the rotor 3 further includes a first magnetic isolation end ring 35 and a second magnetic isolation end ring 36. Each rotor core 32 is correspondingly provided with a first magnetic isolation end ring 35 and a second magnetic isolation end ring 36. The first magnetic isolation end ring 35 and the second magnetic isolation end ring 36 are sleeved on the rotor shaft 31. Along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31, the first magnetic isolation end ring 35 is arranged on the side of the first rotor end ring 33 facing away from the rotor core 32, and the second magnetic isolation end ring 36 is arranged on the side of the second rotor end ring 34 facing away from the rotor core 32. The first magnetic isolation end ring 35 and the second magnetic isolation end ring 36 are made of, but not limited to, mica, plastic or ceramic.

[0061] Please refer to Figure 2 , Figure 4 and Figure 7 , in some embodiments, the rotor 3 includes a plurality of magnetic steel 37, and the plurality of magnetic steel 37 are respectively arranged on the outer peripheral wall of the rotor core 32, and the stator core 21 is sleeved outside the plurality of magnetic steel 37.

[0062] In some embodiments, along the circumferential direction of the rotor core 32, a plurality of magnetic steel 37 are arranged in rows around the outer peripheral wall of the rotor core 32, and along the axial direction of the rotor core 32, the plurality of magnetic steel 37 are arranged in columns in sequence.

[0063] In some embodiments, the magnetic steel 37 is fixed to the outer peripheral wall of the rotor core 32 by bonding.

[0064] In some embodiments, the rotor 3 further includes a retaining ring 38 which is sleeved on a row of permanent magnets 37 arranged along the outer peripheral wall of the rotor core 32. The retaining ring 38 is used to tightly press and fix the permanent magnets 37 on the surface of the rotor core 32. The permanent magnets 37 are adhesively fixed on the surface of the rotor core 32, and together with the fastening and binding effect of the retaining ring 38, the risk of the permanent magnets 37 falling off is greatly reduced.

[0065] In some embodiments, along the axial direction of the rotor core 32, stepped grooves are recessed at both end edges of the permanent magnet 37. Along the circumferential direction of the rotor core 32, the stepped grooves of the permanent magnets 37 arranged in the same row together form a first annular stepped groove 37b. Along the axial direction of the rotor core 32, two opposite annular stepped grooves 37b form a first annular accommodating groove 37c. A retaining ring 38 is provided in each first annular accommodating groove 37c, and the first annular accommodating groove 37c can limit the retaining ring 38 in the axial direction of the rotor shaft 31.

[0066] Please refer to Figure 2 、 Figure 4 and Figure 8 In some embodiments, the rotor shaft 31 is provided with a liquid passing hole i which extends from one end of the rotor shaft 31 to the other end along the axial direction of the rotor shaft 31. The liquid passing hole i is communicated with the accommodating cavity a, and the liquid passing hole i can allow the oil liquid to pass through.

[0067] In some embodiments, a liquid inlet hole j is provided on the side wall of the first end of the rotor shaft 31. One end of the liquid inlet hole j is communicated with the accommodating cavity a, and the other end of the liquid inlet hole j is communicated with the liquid passing hole i.

[0068] Please refer to Figure 2 、 Figure 4 、 Figure 9 and Figure 10 In some embodiments, the number of the rotor cores 32 is at least two, and at least two rotor cores 32 are sequentially arranged at intervals along the axial direction. A centering bearing 5 is connected between every two adjacent rotor cores 32, and the centering bearing 5 is sleeved on the rotor shaft 31. The centering bearing 5 is used to adjust and maintain the concentricity between the rotor 3 and the stator core 21.

[0069] In some embodiments, a connection hole m is further provided at the connection between the rotor shaft 31 and the centering bearing 5. One end of the connection hole is communicated with the liquid passing hole i, and the other end of the connection hole m extends along the radial direction of the rotor shaft 31 to the outer peripheral wall of the rotor shaft.

[0070] In some embodiments, the centering bearing 5 includes an inner ring 51 and an outer ring 52. The outer ring 52 is sleeved on the inner ring 51, and the inner ring 51 is sleeved on the rotor shaft 31.

[0071] In some embodiments, the axes of the inner ring 51, the outer ring 52 and the rotor shaft 31 coincide.

[0072] In some embodiments, the connecting seat 23 is sleeved on the outer peripheral wall of the outer ring 52.

[0073] In some embodiments, the centering bearing 5 is a sliding bearing and operates by the relative sliding of the contact surface between the outer peripheral wall of the inner ring 51 and the inner wall of the outer ring 52.

[0074] In some embodiments, the inner ring 51 is provided with a radial through-hole k, and the radial through-hole k extends from the inner peripheral wall of the inner ring 51 to the outer peripheral wall of the inner ring 51.

[0075] In some embodiments, the oil can flow out of the connecting hole m from the orifice located on the outer peripheral wall of the rotor shaft 31, and penetrate through the gap between the inner peripheral wall of the inner ring 51 and the outer peripheral wall of the rotor shaft 31 to the orifice of the radial through-hole k located on the outer peripheral wall of the inner ring to enter the radial through-hole k.

[0076] In some embodiments, an annular groove n1 is recessed on the inner peripheral wall of the inner ring 51. The annular groove n1 is arranged around the axis of the rotor shaft 31. The inner wall of the annular groove n1 and the outer peripheral wall of the rotor shaft 31 enclose an annular flow channel n2, and the annular flow channel n2 is respectively communicated with the radial through-hole k and the connecting hole m. Compared with the way that the oil penetrates into the radial through-hole k through the gap between the inner peripheral wall of the inner ring 51 and the outer peripheral wall of the rotor shaft 31 after flowing out of the connection port, by providing the annular flow channel n2, it is beneficial to improve the flow efficiency of the oil to improve the heat dissipation effect of the oil.

[0077] It can be understood that the number of the radial through-holes k can be one or more, and the number of the connecting holes m can be one or more. Exemplarily, in some embodiments, the number of the radial through-holes k is multiple, and the number of the connecting holes is the same as that of the radial through-holes k. The multiple radial through-holes k are arranged at equal intervals around the axis of the inner ring 51. Along the direction perpendicular to the axis of the inner ring 51, a connecting hole m is aligned with a radial through-hole k.

[0078] After the oil is injected into the accommodating cavity a, the oil can flow in the liquid passing hole i, the connecting hole m, the annular flow channel n2 and the radial through-hole k, and flow through the annular flow channel n2 and the radial through-hole k to the gaps between the components connected to the two to play a role in lubrication and heat dissipation.

[0079] In some embodiments, the outer ring 52 is provided with a liquid passing port e and an axial through-hole d. The liquid passing port e is respectively communicated with the axial through-hole d and the radial through-hole k. Along the axis of the centering bearing 5, the axial through-hole d extends from one end of the outer ring 52 to the other end of the outer ring 52.

[0080] It can be understood that the number of the axial through-holes d can be one or more. Exemplarily, in some embodiments, the number of the axial through-holes d is multiple, and the multiple axial through-holes d are arranged at equal intervals around the axis of the outer ring 52.

[0081] In some embodiments, an annular protruding portion 53 is formed by protruding the end of the outer ring 52. The annular protruding portion 53 is arranged around the axis of the outer ring 52. The annular protruding portion 53 is sleeved on the inner ring 51. The liquid passing port e is arranged on the annular protruding portion 53 and penetrates through the annular protruding portion 53 in the direction perpendicular to the axis of the rotor shaft 31. The liquid passing port e allows the oil in the accommodating cavity a to flow through. After the oil flows out of the radial through hole k, it flows through the gap between the inner wall of the outer ring 52 and the outer peripheral wall of the inner ring 51 to the gap between the annular protruding portion 53 and the outer peripheral wall of the inner ring 51, and radially flows through the liquid passing port e to the gap between the outer ring 52 along the axial direction of the centering bearing 5 and the rotor 3, and communicates with one end of the axial through hole d through this gap.

[0082] In some embodiments, an annular protruding portion 53 is arranged at the end of the first end of the outer ring 52 facing the first joint 12, and another annular protruding portion 53 is arranged at the end of the second end of the outer ring 52 facing away from the first joint 12. Along the axial direction of the centering bearing 5, the two ends of the axial through hole d communicate with the gaps between the outer ring 52 along the axial direction of the centering bearing 5 and the rotor 3 on both sides of the centering bearing 5 respectively.

[0083] In some embodiments, the annular protruding portion 53 includes an inner peripheral wall 531, and the inner peripheral wall 531 is arranged obliquely in the direction away from the axis of the outer ring 52, that is, the inner peripheral wall 531 is an annular inclined plane. A first annular gap f is formed by enclosing between the inner peripheral wall 531 and the outer peripheral wall 511 of the inner ring 51. The liquid passing port e communicates with the first annular gap f, and the liquid passing port e and the first annular gap f together form a liquid flow path for the oil to flow through, further improving the cooling effect of the oil on the components in the housing 1.

[0084] In some embodiments, along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31, a first backing plate 54 and a second backing plate 55 are respectively arranged on both sides of the inner ring 51. The first backing plate 54 is used to abut between the second magnetic isolation end ring 36 and the inner ring 51, and the second backing plate 55 is used to abut between the first magnetic isolation end ring 35 and the inner ring 51.

[0085] In some embodiments, a first annular protrusion 351 is arranged on the side of the first magnetic isolation end ring 35 facing away from the rotor core 32, and a second annular protrusion 361 is arranged on the side of the second magnetic isolation end ring 36 facing away from the rotor core 32. Along the direction opposite to the X direction, one end of the inner ring 51 abuts against a second annular protrusion 361 through the first backing plate 54, and along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31, the other end of the inner ring 51 abuts against a first annular protrusion 351 through the second backing plate 55.

[0086] In some embodiments, in the direction X from the first end of the rotor shaft 31 towards the second end of the rotor shaft 31, a second annular gap g is formed between the first end of the outer ring 52 and the first magnetic shielding end ring 35, and a third annular gap h is formed between the second end of the outer ring 52 and the second magnetic shielding end ring 36. The axial through-hole d communicates the second annular gap g and the third annular gap h. The second annular gap g communicates with the first annular gap f located at the first end of the outer ring 52 through a liquid passing port e located at the first end of the outer ring 52, and the third annular gap h communicates with the first annular gap f located at the second end of the outer ring 52 through a liquid passing port e located at the second end of the outer ring 52.

[0087] In some embodiments, in the direction X from the first end of the rotor shaft 31 towards the second end of the rotor shaft 31, both the first magnetic shielding end ring 35 and the second magnetic shielding end ring 36 located between two adjacent stator cores 21 are located in the cavity formed by the inner wall of the connecting seat 23. There is a fourth annular gap o between the first magnetic shielding end ring 35 and the inner wall of the connecting seat 23, and a fifth annular gap p between the second magnetic shielding end ring 36 and the inner wall of the connecting seat 23. The fourth annular gap o communicates with the second annular gap g, and the fifth annular gap p communicates with the third annular gap h.

[0088] In some embodiments, there is a sixth annular gap q between the inner wall of the stator core 21 and the outer peripheral wall of the rotor 3. In the direction X from the first end of the rotor shaft 31 towards the second end of the rotor shaft 31, one end of the sixth annular gap q at the first end communicates with the accommodating cavity a through the first opening of the stator core 21 at the first end, and the other end of the sixth annular gap q at the first end communicates with the fifth annular gap p; one end of the sixth annular gap q at the second end communicates with the fourth annular gap o, and the other end of the sixth annular gap q at the second end communicates with the accommodating cavity a through the second opening of the stator core 21 at the second end; one end of the remaining sixth annular gaps q communicates with the fourth annular gap o, and the other end communicates with the fifth annular gap p.

[0089] The second annular gap g, the third annular gap h, the fourth annular gap o, the fifth annular gap p, and the sixth annular gap q are all available for the oil fluid to flow through. The second annular gap g and the third annular gap h on both sides of the centering bearing 5 are communicated through the axial through-hole d. Along the axial direction of the rotor shaft 31, all the second annular gaps g, the axial through-hole d, the third annular gap h, the fourth annular gap o, the fifth annular gap p, and the sixth annular gap q together form a liquid flow channel with both ends communicating with the accommodating cavity a.

[0090] Please refer to Figure 11 and Figure 12 , in some embodiments, the submersible motor 1000 further includes an impeller 8. The impeller 8 is arranged in the accommodating cavity a. The impeller 8 is connected to one end of the rotor shaft 31. The impeller 8 is used to drive the oil fluid into the liquid passing hole i.

[0091] In some embodiments, the first end of the rotor shaft 31 is used to connect to other devices to output torque, and the impeller is disposed at the second end of the rotor shaft 31.

[0092] In some embodiments, the second joint 13 is provided with a mounting hole r, and the accommodating cavity a includes a main cavity a1, a receiving cavity s, and a communication channel t. The mounting hole r communicates with the receiving cavity s. The second end of the rotor shaft 31 is inserted into the mounting hole r, the impeller 8 is disposed in the receiving cavity s, and the communication channel t communicates the receiving cavity s with the main cavity a1. When the submersible motor 1000 operates, the rotation of the rotor shaft 31 drives the impeller 8 to rotate, driving the oil in the receiving cavity s to enter the main cavity a1 through the communication channel t.

[0093] In some embodiments, the communication channel t penetrates through the second joint 13 along the axial direction of the rotor shaft 31.

[0094] In some embodiments, the submersible motor 1000 further includes a speed increaser 9. One end of the speed increaser 9 is connected to the second end of the rotor shaft 31, and the other end of the speed increaser 9 is connected to the impeller 8. The speed increaser 9 converts the low speed of the rotor shaft 31 into the high speed of the impeller 8 through the cooperation of large and small gear pairs, so as to improve the driving effect of the impeller 8 on the oil.

[0095] Figure 4 , Figure 8 and Figure 12 The dashed line with an arrow in shows that in some embodiments, under a certain working condition, the impeller 8 drives the circulating path of the oil flowing in the submersible motor 1000:

[0096] The oil in the accommodating cavity a enters the liquid passing hole i through the liquid inlet hole j, and enters the centralizing bearing 5 through each connecting hole m communicating with the liquid passing hole i. After passing through the annular flow channel n, the oil enters the radial through hole k. In the radial through hole k, the oil can penetrate into the fitting gap between the outer peripheral wall of the inner ring 51 and the inner peripheral wall of the outer ring 52 to play a role in lubrication and heat dissipation.

[0097] Furthermore, the oil can seep out into the first annular gap f through the fitting gap between the outer peripheral wall of the inner ring 51 and the inner peripheral wall of the outer ring 52, and then enter the second annular gap g and the third annular gap h through the radial through hole k. The oil in the third annular gap h can enter the second annular gap g through the axial through hole d.

[0098] The oil in the third annular gap h, after entering the sixth annular gap q communicating with the third annular gap h, then moves along the direction X from the first end of the rotor shaft 31 to the second end of the rotor shaft 31, and finally enters the accommodating cavity a through the second opening of the stator core 21 at the tail end via the sixth annular gap q at the tail end.

[0099] It should be understood that the above-mentioned flow path of the oil fluid in the housing 1 is only an example of the possible flow of the oil fluid, and the flow direction of the oil fluid inside the housing 1 is not fixed. When the local pressure inside the submersible motor 1000 changes due to factors such as the external environment or the operating conditions of the submersible motor 1000, the oil fluid will flow from the direction of higher pressure to the direction of lower pressure.

[0100] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present application.

Claims

1. A submersible motor, characterized in that, Comprising: A housing provided with a receiving cavity, and oil is provided in the receiving cavity; A rotor disposed in the receiving cavity; A stator core disposed in the receiving cavity, the stator core being sleeved on the rotor, the stator core being provided with stator slots, and along the axial direction of the stator core, the stator slots extend from one end of the stator core to the other end of the stator core; Windings passing through the stator slots; A hollow tube passing through the stator slots, the hollow tube being in communication with the receiving cavity, and the hollow tube allowing the oil to pass through.

2. The submersible motor according to claim 1, wherein A liquid passing groove is provided on the outer peripheral wall of the stator core, and along the axial direction of the stator core, the liquid passing groove extends from one end of the stator core to the other end of the stator core; The liquid passing groove is in communication with the receiving cavity, and the liquid passing groove allows the oil to pass through.

3. The submersible motor according to claim 1, wherein The number of the stator cores is at least two, at least two of the stator cores are arranged in sequence along the axial direction, and the stator slots of two adjacent stator cores are respectively in communication; The windings and the hollow tubes respectively pass through the stator slots of at least two of the stator cores.

4. The submersible motor according to claim 3, wherein A connecting seat is further included, the connecting seat is sleeved on the rotor, and two ends of the connecting seat are respectively connected to two adjacent stator cores; The connecting seat is provided with a communicating groove, two ends of the communicating groove are respectively in communication with the stator slots of two adjacent stator cores, and the windings and the hollow tubes respectively pass through the communicating groove.

5. The submersible motor according to any one of claims 1-4, wherein A temperature sensor is further included, and the temperature sensor is disposed in the stator slot.

6. The submersible motor according to claim 1, wherein The rotor includes a rotor shaft, a rotor core and a plurality of magnetic steel, the rotor core is sleeved on the rotor shaft, the plurality of magnetic steel are respectively disposed on the outer peripheral wall of the rotor core, and the stator core is sleeved outside the plurality of magnetic steel; The rotor shaft is provided with a liquid passing hole, and along the axial direction of the rotor shaft, the liquid passing hole extends from one end of the rotor shaft to the other end of the rotor shaft, the liquid passing hole is in communication with the receiving cavity, and the liquid passing hole allows the oil to pass through.

7. The submersible motor according to claim 6, wherein The number of the rotor cores is at least two, at least two of the rotor cores are sequentially spaced along the axial direction, and a centering bearing is connected between every two adjacent rotor cores, and the centering bearing is sleeved on the rotor shaft; A connecting hole is further provided at the connection between the rotor shaft and the centering bearing, one end of the connecting hole is in communication with the liquid passing hole, and the other end of the connecting hole extends along the radial direction of the rotor shaft to the outer peripheral wall of the rotor shaft.

8. The submersible motor according to claim 7, wherein The centering bearing includes an inner ring and an outer ring, the outer ring is sleeved on the inner ring, and the inner ring is sleeved on the rotor shaft; The inner ring is provided with radial through holes which extend from the inner peripheral wall of the inner ring to the outer peripheral wall of the inner ring.

9. The submersible motor according to claim 8, wherein the outer ring is provided with a liquid passing port and an axial through hole, and the liquid passing port communicates with the axial through hole and the radial through hole respectively; Axially along the centering bearing, the axial through hole extends from one end of the outer ring to the other end of the outer ring.

10. The submersible motor according to any one of claims 6-9, wherein it further includes an impeller disposed in the accommodating cavity. The impeller is connected to one end of the rotor shaft, and the impeller is used to drive the oil liquid into the liquid passing hole.

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