CN212518688U

CN212518688U - Motor for submersible well

Info

Publication number: CN212518688U
Application number: CN202021879774.3U
Authority: CN
Inventors: 叶涛松; 陈恩才; 陈伟达; 张博峰; 刘进; 陆增鑫
Original assignee: Ningbo Kaisheng Electrical Co ltd
Current assignee: Ningbo Kaisheng Electrical Co ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-02-09
Anticipated expiration: 2030-09-01

Abstract

The utility model discloses a motor for diving well, through with the inside hollow structure that sets up of motor shaft, the motor shaft is in thrust ring, the radial through-hole that has all opened of first bearing and second bearing department of meeting, form inside medium passageway between shield sleeve and the motor rotor subassembly, the cooling water that prestores is in inside medium passageway, inside medium passageway is linked together through the hollow part of through-hole with the motor shaft, the cooling water forms the cooling circulation in the motor when the motor rotates the process, take away the heat that the bearing rubbed and motor rotor, motor stator. An outer cylinder is arranged on the outer side of the motor and forms an outer channel with the motor shell, and the pumping medium forcibly cools the motor to take away heat of the motor. The utility model discloses effectively reduce the motor temperature rise, improve the bearing system life-span, prevent the overheated demagnetization of magnet steel and the overheated insulation damage who arouses of winding, also can show simultaneously and reduce motor running noise and vibrations, the risk of revealing does not have, and no mechanical seal is non-maintaining, improves motor efficiency, has extended the range of application of motor.

Description

Motor for submersible well

Technical Field

The utility model relates to the technical field of motors, concretely relates to motor for well dives.

Background

The shielded motor has no mechanical seal, and the conveyed medium can directly pass through the stator and the rotor to lubricate and cool the bearing system and take away the heat of the stator and the rotor. The high-speed motor, particularly the permanent magnet synchronous motor, is developed rapidly in recent years, the rotating speed of the motor can be improved to 2900RPM (50HZ) and 3500RPM (60HZ) which are two times or even three times higher than the traditional commercial power operating frequency, and can reach more than 8000-10000 RPM, and the volume and the weight of the motor and the load thereof can be greatly reduced after the motor is improved, and the power density and the efficiency are improved.

The traditional shielding motor adopts a graphite radial sliding bearing, cannot bear the load of high rotating speed and has short service life. And high rotating speed and high power density can bring higher heat dissipation requirements, the magnetic steel of the permanent magnet rotor has poor heat resistance, and the magnetic steel can be instantaneously demagnetized at high temperature, so that the performance of the motor is reduced and even the motor fails.

In view of this, it is urgently needed to improve the structure of the existing motor so as to improve the heat dissipation effect, guarantee the service life of the bearing system and improve the motor efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the radiating effect is poor when high-speed operation of current motor, causes the problem of magnet steel demagnetization easily.

In order to solve the technical problem, the technical scheme adopted by the utility model is to provide a motor for a submersible well, which comprises a motor shaft, a motor rotor assembly, a motor stator assembly, a motor shell and a motor casing, wherein the interior of the motor shaft is of a hollow structure, the motor shaft passes through a thrust ring and is rotatably arranged in the motor, a first bearing is arranged at the upper end, a second bearing is arranged at the lower end, through holes are uniformly formed in the radial direction of the joint of the thrust ring, the first bearing and the second bearing by the motor shaft, the motor shaft drives the motor rotor assembly to rotate, a shielding sleeve is wrapped outside the motor rotor assembly, an internal medium channel is formed between the shielding sleeve and the motor rotor assembly, cooling water is pre-stored in the internal medium channel, and the internal medium channel is communicated with the hollow part of the motor shaft through the through holes, the motor stator assembly surrounds the motor shaft, the motor is connected with the pump through a connecting device, the connecting device comprises a first connecting portion and a second connecting portion which are arranged up and down, the first connecting portion is connected with the second connecting portion through a plurality of rib plates, an annular groove is formed in the upper portion of the first connecting portion and used for placing a sealing piece, the motor housing wraps the motor, and the motor casing wraps the motor housing and forms an external medium channel between the motor housing.

In the above technical solution, the motor rotor assembly includes:

the rotor sheath is wrapped on the whole motor rotor, and two sides of two ends of the rotor sheath are tightly pressed in a spinning and curling mode;

and the plastic cover plate is divided into an upper rotor cover plate and a lower rotor cover plate which are respectively arranged at two ends of the whole motor rotor.

In the above technical scheme, the motor stator assembly includes a stator core and a winding, the winding is placed in a sealed cavity, and epoxy resin is filled in the sealed cavity.

In the above technical solution, the thrust collar is disposed between the rotor upper cover plate and the first bearing.

In the technical scheme, the thrust collar is formed in an injection molding mode, the end part of the thrust collar is provided with radial grooves, and the inner side surface of the thrust collar is provided with a toothed groove which is in interference fit with the radial through hole of the motor shaft.

In the technical scheme, the upper end of the motor shaft penetrates through the thrust ring and is rotatably arranged in the upper flange, and the lower end of the motor shaft penetrates through the lower flange.

In the technical scheme, an upper bearing seat is arranged below the upper flange and fixedly connected through bolts, and a lower bearing seat is arranged below the lower flange and fixedly connected through bolts.

In the technical scheme, a plane thrust bearing assembly is arranged between the lower rotor cover plate and the second bearing and comprises a thrust bearing seat of the axle, a graphite plane thrust bearing movable ring and a thin-wall sheath on the outer side of the thrust bearing seat, and a plurality of radial grooves are radially distributed on the upper end surface of the second bearing.

In the technical scheme, the surface of the motor shaft is provided with the wear-resistant coating.

In the technical scheme, the upper flange is provided with the exhaust valve, and the exhaust valve is used for balancing the internal and external pressure of the motor and exhausting.

Compared with the prior art, the motor for the submersible well of the utility model has the advantages that the inner part of the motor shaft is arranged into a hollow structure, the radial direction of the connecting part of the motor shaft and the thrust ring, the first bearing and the second bearing is provided with through holes, an inner medium channel is formed between the shielding sleeve and the motor rotor component, cooling water is pre-stored in the inner medium channel, the internal medium channel is communicated with the hollow part of the motor shaft through a through hole, when the motor rotates, forming cooling circulation in the motor, when the motor drives the pump to pump water, water flow enters the external medium channel through the connecting device by the pump, therefore, the service life of a bearing system is prolonged, the magnetic steel is prevented from being demagnetized, the running noise and vibration of the motor can be obviously reduced, the leakage risk is avoided, the mechanical seal is free from maintenance, the motor efficiency is improved, and the application range of the motor is expanded.

Drawings

Fig. 1 is a sectional view of a motor for a submersible well according to the present invention;

fig. 2 is a cross-sectional view of a motor rotor assembly of a motor for a submersible well according to the present invention;

fig. 3 is a perspective view of a connecting device of a motor for a submersible well according to the present invention;

fig. 4 is a cross-sectional view of a thrust bearing assembly of a submersible motor according to the present invention;

fig. 5 is a front view of a thrust bearing assembly of a submersible motor according to the present invention;

fig. 6 is a perspective view of a thrust collar of a motor for a submersible well according to the present invention.

Wherein, the correspondence between the reference numbers and the component names in fig. 1 to 3 is:

100 motor shaft, 200 motor rotor assembly, 300 motor stator assembly, 400 motor housing, 500 motor casing, 600 external medium channel, 700 connecting device, 101 thrust ring, 102 first bearing, 103 second bearing, 104 shielding sleeve, 105 internal medium channel, 106 upper flange, 107 lower flange, 108 exhaust valve, 201 rotor upper cover plate, 202 rotor lower cover plate, 203 sheath, 204 rotor core, 205 magnetic steel, 301 stator core, 302 winding, 303 epoxy resin, 701 first connecting part, 702 second connecting part, 703 annular groove, 704 rib plate, 705 first annular boss, 706 second annular boss, 1031 radial groove, 109 thrust bearing assembly, 1091 thrust bearing seat, 1092 thrust bearing movable ring, 1093 thin-wall sheath.

Detailed Description

The utility model provides a motor for diving well can realize the inside and outside dual cooling cycle of motor shaft, takes away bearing system and motor stator and electric motor rotor heat, guarantees the bearing system life-span. The invention is described in detail below with reference to the drawings and the detailed description.

As shown in fig. 1 to 3, the utility model provides a motor for submersible well, including motor shaft 100, motor rotor assembly 200, motor stator assembly 300, motor housing 400 and motor casing 500, the inside hollow structure that is of motor shaft 100, motor shaft 100 passes through thrust collar 101 and rotatably sets up in the motor intermediate position, the upper end is provided with first bearing 102, the lower extreme is provided with second bearing 103, motor shaft 100 has through-holes in the radial direction of the junction of thrust collar 101, first bearing 102 and second bearing 103, motor shaft 100 drives motor rotor assembly 200 to rotate, motor rotor assembly 200 is externally wrapped up and is provided with shield 104, form internal medium passageway 105 between shield 104 and motor rotor assembly 200, prestore cooling water in internal medium passageway 105, internal medium passageway 105 is communicated with the hollow part of motor shaft 100 through the through-hole, motor stator assembly 300 sets up around motor shaft 100, motor shaft 100 is connected with the pump shaft through the shaft coupling, the motor passes through connecting device 700 with the pump and links to each other, connecting device 700 includes first connecting portion 701 and the second connecting portion 702 that set up from top to bottom, link to each other through a plurality of gusset 704 between first connecting portion 701 and the second connecting portion 702, the upper portion of first connecting portion 701 is provided with ring channel 703, ring channel 703 is used for placing the sealing member, motor housing 400 wraps up the motor setting, motor protects a section of thick bamboo 500 parcel motor housing 400 to and form outside medium passageway 600 between motor housing 400.

In this embodiment, by setting the inside of the motor shaft 100 as a hollow structure, through holes are all opened in the radial direction of the motor shaft 100 at the joint of the thrust collar 101, the first bearing 102 and the second bearing 103, an internal medium channel 105 is formed between the shielding sleeve 104 and the motor rotor assembly 200, cooling water is pre-stored in the internal medium channel 105, the internal medium channel 105 is communicated with the hollow part of the motor shaft 100 through the through holes, cooling water forms an internal cooling circulation of the motor when the motor rotates, when the motor drives the pump to pump water, water flows from the pump to the external medium channel 600 through the connecting device 700, thereby realizing a heat dissipation mode of internal and external double circulation, accelerating the heat taking away from the bearing friction and the motor rotor and motor stator, prolonging the service life of the bearing system, preventing the demagnetization of the magnetic steel 205, and simultaneously significantly reducing the operation noise and vibration of the motor, having no leakage risk, and having no mechanical seal and, the efficiency of the motor is improved, and the application range of the motor is expanded.

Specifically, when the motor is in operation, the motor shaft 100 drives the motor rotor assembly 200 to rotate, the motor shaft 100 is hollow, and the lower end of the motor shaft 100 is provided with a sealing plug, so that in the rotating process of the motor shaft 100, cooling water in the internal medium channel 105 can enter the motor shaft 100 through a through hole in the motor shaft 100 and flow between the motor shaft 100 and the internal medium channel 105, thereby realizing internal circulation, when the motor drives the pump to pump water, water flows through the connecting device 700 by the pump, the first connecting part 701 of the connecting device 700 is connected with the motor, the second connecting part 702 is connected with the pump, the first connecting part 701 is connected with the second connecting part 702 through the rib plate 704, so that a gap exists between the first connecting part 701 and the second connecting part 702, and water can enter the external medium channel 600 through the gap, thereby realizing external cooling.

Further, an annular groove 703 is formed at an upper portion of the first connecting portion 701, and a sealing member can be placed in the annular groove to improve the sealing performance, wherein the sealing member is of an inner package framework type, for example: GB/T13871.1-2007, during the cooling process, the cooling water in the internal circulation channel is lost, so that a pressure difference is formed between the inside and the outside of the motor, when the pressure difference is larger than a preset value, the sealing element moves upwards, so that the water pumped by the pump enters the internal circulation channel as the cooling water, and the cooling water in the internal circulation channel is supplemented.

Water pumped on the water pump can effectively exchange heat with internal cooling media by scouring the wall surface of the external medium channel 600, so that the heat of the internal media is taken away, and the heat dissipation capacity of the motor is further improved.

The first bearing 102 and the second bearing 103 are made of hard materials such as silicon carbide zirconium oxide and the like, the height of the matching section is reduced according to the characteristic of high rotating speed and high load, and the height ratio of the inner diameter is set to be 0.4-0.8, preferably 0.5-0.6.

As shown in fig. 3, in an embodiment of the present invention, preferably, the first connection portion 701 of the connection device 700 is used for being connected to an electric machine, the second connection portion 702 is used for being connected to a pump, a through hole is formed in the middle of the first connection portion 701, the first connection portion 701 is in an inverted truncated cone shape, the second connection portion 702 is in a cylindrical shape, a first annular boss 705 is disposed at the position where the first connection portion 701 is tightly attached to the through hole, an annular groove 703 is disposed on the upper portion of the first connection portion 701, the annular groove 703 is used for placing a sealing ring, the first connection portion 701 is connected to the second connection portion 702 through a plurality of rib plates 704, and a second annular boss 706 is disposed on the upper portion surrounding the second connection.

In this embodiment, the first connection portion 701 is used for being connected with a motor and is in an inverted truncated cone-shaped structure, the lower flange 107 of the motor abuts against the first connection portion 701, the sleeve of the motor abuts against the upper surface of the second annular boss 706, the pump cylinder wraps the pump, the pump cylinder abuts against the lower surface of the upper surface of the second annular boss 706, the motor shaft 100 passes through the through hole of the first connection portion 701 and is connected with the pump shaft through the coupler, abrasion caused by mutual contact between the motor sleeve and the pump cylinder is effectively avoided, the annular groove 703 is arranged on the upper portion of the first connection portion 701 and used for placing a sealing ring, the sealing performance of connection between the pump and the motor is improved, the first connection portion 701 is connected with the second connection portion 702 through the rib plate 704, and under the condition that water can smoothly flow through, the reliability and the stability of connection between the first connection portion 701 and the second connection portion 702 are effectively improved, and the user experience is improved.

In an embodiment of the present invention, preferably, the motor rotor assembly 200 includes:

the rotor sheath 203 is wrapped on the whole motor rotor, and two sides of two ends of the rotor sheath 203 are tightly pressed in a spinning and curling mode;

the plastic cover plate is divided into an upper rotor cover plate 201 and a lower rotor cover plate 202 which are respectively arranged at two ends of the whole motor rotor.

In this embodiment, the sheath 203 is wrapped around the motor rotor assembly 200 to be integrally disposed, two ends of the sheath 203 are compressed by spinning and curling, the medium channel is between the sheath 203 and the shielding sleeve 104, the sheath 203 can effectively prevent the medium from entering the inside of the rotor, prevent the rotor core 204 and the magnetic steel 205 from being oxidized, prolong the service life of the motor, improve the user experience, the sheath 203 belongs to a thin-walled shell, the tension can be kept for a long time after the flanging, thereby ensuring the axial and radial sealing pressure, improving the protection effect on the interior of the motor, prolonging the service life of the motor, and the plastic material has the advantage of light weight, effectively reduces the overall mass of the rotor, reduces the rotational inertia, is more suitable for the working condition of the high-speed motor, improves the safety and the reliability of the motor, does not need to additionally perform dynamic balance, reduces the installation steps and improves the user experience.

Wherein, the integrative injection moulding of plastics apron, the preparation method is simple, generates efficiently, and 1/10 of ordinary metal apron is compared to the cost, and saves 4 welding processes in both ends, has practiced thrift the cost greatly, and the quality is only 1/8 of stainless steel under the same wall thickness, reduces the whole quality of rotor, reduces inertia, is more suitable for high-speed motor's operating mode, and need not additionally to do dynamic balance

In an embodiment of the utility model, preferably, motor stator subassembly 300 includes stator core 301 and winding 302, and winding 302 is placed in sealed cavity, and the encapsulation has high coefficient of thermal conductivity's epoxy 303 in the sealed intracavity, has improved the heat-sinking capability of winding greatly.

In an embodiment of the present invention, preferably, the thrust collar 101 is disposed between the rotor upper cover plate 201 and the first bearing 102.

In the embodiment, a thrust ring 101 is arranged between the rotor upper cover plate 201 and the first bearing 102, and is fixedly connected with the motor shaft 100 in the radial direction, and a gap of 1-2 mm exists between the axial direction and the end face of the first bearing 102.

In one embodiment of the present invention, the thrust collar 101 is preferably formed by injection molding, and has radial grooves distributed on its end, and the inner side surface is provided with tooth-like grooves that are interference-fitted with the radial through holes of the motor shaft 100.

In this embodiment, the inner side of the thrust collar 101 is provided with a toothed groove, and the toothed groove is in interference fit with a radial through hole of the motor shaft 100, so that the tightness and reliability of connection between the thrust collar 101 and the motor shaft 100 are improved, cooling water continuously forms a liquid film to provide axial support, the cooling water can take away friction heat in internal and external circulation of the hollow shaft, the thrust collar 101 is made of wear-resistant and high-temperature-resistant materials, such as polytetrafluoroethylene (FTFE), the strength and toughness of the thrust collar are better, an axial thrust effect is provided when the motor is started or stopped, the thrust collar cannot be damaged after long-time continuous contact operation under a light load.

In one embodiment of the present invention, it is preferable that the upper end of the motor shaft 100 is rotatably disposed in the upper flange 106 through the thrust collar 101 and the lower end is disposed through the lower flange 107.

In an embodiment of the present invention, preferably, the upper flange 106 is provided with an upper bearing seat below and is fixedly connected by bolts, and the lower flange 107 is provided with a lower bearing seat below and is fixedly connected by bolts.

In this embodiment, an upper bearing seat is arranged below the upper flange 106 and fixedly connected through bolts, and a lower bearing seat is arranged below the lower flange 107 and fixedly connected through bolts, so that the stability and reliability of fixing the upper bearing seat and the lower bearing seat are effectively improved, and the safety problem caused by the falling of the upper bearing seat or the lower bearing seat is avoided.

In an embodiment of the present invention, preferably, a plane thrust bearing assembly 109 is provided between the rotor lower cover plate 202 and the second bearing 103, the thrust bearing assembly 109 includes a thrust bearing seat 1091 holding the shaft, a graphite plane thrust bearing movable ring 1092, and a thin wall sheath 1093 outside the thrust bearing seat, and the upper end surface of the second bearing has a plurality of radial grooves 1031 radially.

In the embodiment, except that the thin-wall sheath is made of thin-wall metal, other parts are rubber and graphite, the integral mass is light, the rotational inertia is small, the radial size is greatly reduced compared with the traditional structure, the circumferential linear velocity is obviously reduced under the same rotating speed, and the working condition of higher rotating speed can be adapted.

The thrust bearing seat 1091 is made of oil-resistant rubber, is light in overall weight and small in rotational inertia, can be adjusted in a self-adaptive mode within a certain angle range under axial load, is in close rotating contact with the end face of the second bearing 103, can continuously generate an oil film in a radial groove 1021 of the second bearing 103 during high-speed rotation, and can provide continuous thrust by the molecular tension of the surface of the oil film liquid.

In an embodiment of the present invention, preferably, the upper flange 106 is provided with an exhaust valve 108, and the exhaust valve 108 is used for balancing the pressure inside and outside the motor and exhausting.

In one embodiment of the present invention, the motor shaft 100 is preferably provided with a wear-resistant coating on the surface.

In this embodiment, the motor shaft 100 is integrally provided with a wear-resistant coating at a position where the motor shaft is subjected to friction, or is provided with a shaft sleeve structure with the wear-resistant coating, the coating process includes Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), plasma thermal spraying and the like, preferably thermal spraying, the coating material is preferably tungsten carbide hard alloy, preferably hardness HV1500-2200, and the coating thickness is 20-400 μ, preferably thickness is 120-150 μm, so that the motor shaft 100 has high-hardness wear-resistant characteristics, excellent bonding strength, peeling resistance, heat resistance, impact resistance, adaptability to high-speed working conditions, and long service life.

The utility model provides a motor for diving well, through setting up the motor shaft inside as hollow structure, the motor shaft has all opened the through-hole in the radial of thrust ring, first bearing and second bearing junction, form the internal medium passageway between shield sleeve and the motor rotor subassembly, prestore the cooling water in the internal medium passageway, the internal medium passageway is linked together through the through-hole and the hollow part of motor shaft, the cooling water forms the cooling circulation in the motor when the motor rotates, when the motor is drawing water at the driving pump, the rivers flow into the external medium passageway through connecting device by the pump, the heat dissipation mode of inside and outside dual cycle has been realized, take away the heat of bearing friction and motor rotor, motor stator with higher speed, improve the demagnetization bearing system life-span, prevent the magnet steel, also can show simultaneously and reduce motor running noise and vibrations, no leakage risk, no mechanical seal is non-maintaining, the efficiency of the motor is improved, and the application range of the motor is expanded.

In the present application, the terms "first", "second", "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

The present invention is not limited to the above-mentioned best mode, and any person should learn the structural change made under the teaching of the present invention, all with the present invention has the same or similar technical solution, all fall into the protection scope of the present invention.

Claims

1. A motor for a submersible well comprises a motor shaft, a motor rotor assembly, a motor stator assembly, a motor shell and a motor casing, and is characterized in that the inside of the motor shaft is of a hollow structure, the motor shaft penetrates through a thrust ring and is rotatably arranged in the motor, a first bearing is arranged at the upper end of the motor shaft, a second bearing is arranged at the lower end of the motor shaft, through holes are formed in the radial direction of the joint of the thrust ring, the first bearing and the second bearing of the motor shaft, the motor shaft drives the motor rotor assembly to rotate, a shielding sleeve is wrapped outside the motor rotor assembly, an internal medium channel is formed between the shielding sleeve and the motor rotor assembly, cooling water is prestored in the internal medium channel, the internal medium channel is communicated with the hollow part of the motor shaft through the through holes, and the motor stator assembly is arranged around, the motor is connected with the pump through a connecting device, the connecting device comprises a first connecting portion and a second connecting portion which are arranged up and down, the first connecting portion is connected with the second connecting portion through a plurality of rib plates, an annular groove is formed in the upper portion of the first connecting portion and used for placing a sealing piece, the motor casing wraps the motor, and the motor casing wraps the motor casing and forms an external medium channel between the motor casing.

2. A submersible well motor according to claim 1 wherein the motor rotor assembly comprises:

the rotor sheath is wrapped on the motor rotor, and two sides of two ends of the rotor sheath are tightly pressed in a spinning and curling mode;

3. The motor for the submersible well according to claim 1, wherein the motor stator assembly comprises a stator core and windings, the windings are placed in a sealed cavity, and the sealed cavity is filled with epoxy resin.

4. The motor for a submersible well according to claim 2, wherein the thrust collar is disposed between the rotor upper cover plate and the first bearing.

5. The motor for the submersible well as recited in claim 1, wherein the thrust collar is formed by injection molding, and has radial grooves on an end portion thereof, and the inner side surface has tooth-shaped grooves in interference fit with the radial through hole of the motor shaft.

6. The submersible well motor of claim 1, wherein the motor shaft has an upper end rotatably disposed through the thrust ring within the upper flange and a lower end disposed through the lower flange.

7. The motor for the submersible well according to claim 6, wherein an upper bearing seat is arranged below the upper flange and fixedly connected through bolts, and a lower bearing seat is arranged below the lower flange and fixedly connected through bolts.

8. The motor for the submersible well is characterized in that a thrust bearing assembly is arranged between the lower rotor cover plate and the second bearing, the thrust bearing assembly comprises a thrust bearing seat of a shaft holding type, a graphite plane thrust bearing moving ring and a thin-wall sheath on the outer side of the thrust bearing seat, and a plurality of radial grooves are radially distributed on the upper end face of the second bearing.

9. A motor for a submersible well as recited in claim 1 in which the motor shaft surface is provided with a wear resistant coating.

10. The motor for the submersible well according to claim 6, wherein the upper flange is provided with an exhaust valve, and the exhaust valve is used for balancing the internal pressure and the external pressure of the motor and exhausting air.