CN212367059U - Motor for high-speed pump - Google Patents

Abstract

The utility model discloses a motor for high-speed pump through with the inside hollow structure that sets up of motor shaft, the motor shaft is in the thrust collar first bearing with the radial through-hole that has all been opened of second bearing department of meeting, the housing with form inside medium passageway between the motor rotor subassembly, prestore cooling medium in the medium passageway, inside medium passageway pass through the through-hole with the well kenozooecium phase splitting intercommunication of motor shaft, cooling medium form 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, the embedment has epoxy between stator winding and the interior outer casing, improves the heat-sinking capability of winding greatly. The utility model discloses, improve the bearing system life-span, prevent that the magnet steel from demagnetizing, also can show reduction motor noise of operation and vibrations simultaneously, do not have the risk of revealing, do not have mechanical seal non-maintaining, improve motor efficiency, extended the range of application of motor.

Description

Motor for high-speed pump

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to motor for high-speed pump.

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 high-speed pump, which comprises a motor shaft, a motor rotor assembly and a motor stator assembly which are arranged in a motor shell, wherein the inside 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, a cooling medium is pre-stored in the medium channel, and the internal medium channel is communicated with the hollow part of the motor shaft through, the motor stator assembly is disposed around the motor rotor assembly.

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

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;

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 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 embracing the shaft, a graphite plane thrust bearing movable ring and a thin-wall sheath arranged 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 high-speed pump of the utility model has the advantages that the inner part of the motor shaft is arranged into a hollow structure, the motor shaft is arranged in the thrust ring, the radial direction of the joint of the first bearing and the second bearing is provided with the through hole, the shielding sleeve and the motor rotor component form an internal medium channel, the cooling medium is pre-stored in the medium channel, the internal medium channel is communicated with the hollow part of the motor shaft through the through hole, the cooling medium forms the cooling circulation in the motor when the motor rotates, the heat of the bearing friction and the motor rotor and the motor stator is taken away, the cavity formed by the stator winding and the inner and outer shells is filled with the epoxy resin with high heat conductivity coefficient, the heat dissipation capacity of the winding is greatly improved, the service life of the bearing system is prolonged, the demagnetization of the magnetic steel is prevented, and the operation noise and vibration, the leakage risk is avoided, the mechanical seal is not needed, the maintenance is avoided, the motor efficiency is improved, and the application range of the motor is expanded.

Drawings

Fig. 1 is a cross-sectional view of a motor for a high-speed pump according to the present invention;

fig. 2 is a cross-sectional view of a motor rotor assembly of a high-speed pump motor according to the present invention;

fig. 3 is a cross-sectional view of a thrust bearing assembly of a high-speed pump motor of the present invention;

fig. 4 is a front view of a thrust bearing assembly of a motor for a high-speed pump according to the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 4 is:

100 motor shaft, 200 motor rotor assembly, 300 motor stator assembly, 400 motor housing, 101 thrust collar, 102 first bearing, 103 second bearing, 104 shield 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 rotor sheath, 204 rotor core, 205 magnetic steel, 301 stator core, 302 winding, 303 epoxy resin, 1021 radial slot, 109 thrust bearing assembly, 1091 thrust bearing block, 1092 thrust bearing movable ring, 1093 thin wall sheath.

Detailed Description

The utility model provides a motor for high-speed pump can realize the cooling circulation in the motor, 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 and fig. 2, the present invention provides a motor for a high speed pump, including a motor shaft 100 disposed in a motor housing 400, a motor rotor assembly 200 and a motor stator assembly 300, the interior of the motor shaft 100 is a hollow structure, the motor shaft 100 passes through a thrust collar 101 and is rotatably disposed in the motor, a first bearing 102 is disposed at the upper end, a second bearing 103 is disposed at the lower end, through holes are radially opened at the joint of the thrust collar 101, the first bearing 102 and the second bearing 103 of the motor shaft 100, the motor shaft 100 drives the motor rotor assembly 200 to rotate, a shielding sleeve 104 is wrapped outside the motor rotor assembly 200, an internal medium channel 105 is formed between the shielding sleeve 104 and the motor rotor assembly 200, a pre-stored cooling medium is disposed in the medium channel, the internal medium channel 105 is communicated with the hollow portion of the motor shaft 100 through the through holes, the, the motor shaft 100 is connected to the pump shaft through a coupling.

In this embodiment, through setting up the inside hollow structure that sets up of motor shaft 100, motor shaft 100 has all opened the through-hole in the radial of thrust collar 101, the department that meets of first bearing 102 and second bearing 103, form inside medium passageway 105 between shield sleeve 104 and motor rotor subassembly 200, prestore cooling medium in the medium passageway, inside medium passageway 105 is linked together through the hollow part of through-hole with motor shaft 100, cooling medium is when the motor rotates the process, form the cooling cycle in the motor, take away the heat of bearing friction and motor rotor, motor stator, improve the life-span of bearing system, prevent magnet steel 205 demagnetization, also can show simultaneously to reduce motor running noise and vibrations, no leakage risk, no mechanical seal is free of maintenance, improve motor efficiency, the range of application of motor has been expanded.

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.

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 rotor sheath 203 is wrapped in the motor rotor assembly 200 and integrally arranged, two ends of the rotor sheath 203 are pressed by spinning and curling, a medium channel is arranged between the rotor sheath 203 and the shielding sleeve 104, the rotor sheath 203 can effectively prevent a medium from entering the inside of the rotor, prevent a rotor core 204 and magnetic steel 205 from being oxidized, prolong the service life of the motor and improve user experience, the rotor sheath 203 belongs to a thin-wall shell, and can maintain tension for a long time after being flanged, so that axial and radial sealing pressure is ensured, the protection effect on the inside of the motor is improved, the service life of the motor is prolonged, and the plastic material has the advantage of light weight, effectively reduces the overall quality of the rotor, reduces the rotational inertia, is more suitable for the working condition of a high-speed motor, improves the safety and reliability of the motor, does not need to additionally perform dynamic balance, and reduces the, and the user experience is improved.

Wherein, the integrative injection moulding of plastics apron, the preparation method is simple, generates efficiently, and the 1/10 of ordinary metal cover plate 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, which 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, a liquid film is continuously formed by a cooling medium to provide axial support, the cooling medium can take away friction heat in an internal and external circulation of the hollow shaft, the thrust collar 101 is made of wear-resistant and high-temperature-resistant material, 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.

As shown in fig. 3 and 4, in an embodiment of the present invention, preferably, a plane thrust bearing assembly 109 is disposed between the rotor lower cover plate 202 and the second bearing 103, the thrust bearing assembly 109 includes a thrust bearing seat 1091 for embracing the shaft, a graphite plane thrust bearing movable ring 1092, and a thin-wall sheath 1093 outside the thrust bearing seat, and a plurality of radial grooves 1031 are radially distributed on the upper end surface of the second bearing 103.

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.

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 pair of high-speed pump motor, through setting up the motor shaft is inside to hollow structure, the motor shaft is at the thrust ring, the radial through-hole that has all been opened of first bearing and second bearing department of meeting, form inside medium passageway between shield sleeve and the motor rotor subassembly, prestore cooling medium in medium passageway, inside medium passageway passes through the through-hole and communicates with the well kenozooecium phase-splitting of motor shaft, cooling medium is when the motor rotates the process, form the cooling cycle in the motor, take away bearing friction and motor rotor, motor stator's heat, improve bearing system life-span, prevent magnet steel demagnetization, also can show simultaneously and reduce motor running noise and vibrations, the risk of revealing, no mechanical seal is exempted from to maintain, the efficiency of a motor is improved, the range of application of motor has been extended.

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 (10)

1. A motor for a high-speed pump comprises a motor shaft, a motor rotor assembly and a motor stator assembly which are arranged in a motor shell, it is characterized in that the inside of the motor shaft is of a hollow structure, the motor shaft passes through the thrust ring and is rotatably arranged in the motor, the upper end of the motor shaft is provided with a first bearing, the lower end of the motor shaft is provided with a second bearing, through holes are formed in the motor shaft in the radial direction at the joint of the thrust ring, the first bearing and the second bearing, the motor shaft drives the motor rotor component to rotate, the shielding sleeve is wrapped outside the motor rotor component, an internal medium channel is formed between the shielding sleeve and the motor rotor component, a cooling medium is pre-stored in the medium channel, the internal medium channel is communicated with the hollow part of the motor shaft through the through hole, and the motor stator component is arranged around the motor rotor component.

2. The electric motor for a high speed pump of claim 1, wherein the electric 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;

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 motor rotor.

3. The motor for the high-speed pump 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 high-speed pump according to claim 2, wherein the thrust ring is provided between the rotor upper cover plate and the first bearing.

5. The motor of 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 for interference fit with the radial through hole of the motor shaft.

6. A motor for a high speed pump according to claim 1, wherein an upper end of the motor shaft is rotatably provided in the upper flange through the thrust ring, and a lower end is provided through the lower flange.

7. The motor for the high-speed pump according to claim 6, wherein the upper flange is provided with an upper bearing seat below and fixedly connected by bolts, and the lower flange is provided with a lower bearing seat below and fixedly connected by bolts.

8. The motor for the high-speed pump according to claim 2, wherein a planar thrust bearing assembly is arranged between the lower rotor cover plate and the second bearing, the thrust bearing assembly comprises a thrust bearing seat for embracing the shaft, a graphite planar thrust bearing moving ring and a thin-walled sheath outside the thrust bearing seat, and a plurality of radial grooves are radially distributed on the upper end surface of the second bearing.

9. The motor for a high-speed pump according to claim 1, wherein a surface of the motor shaft is provided with a wear-resistant coating.

10. The motor for the high-speed pump according to claim 6, wherein the upper flange is provided with a vent valve for balancing pressure inside and outside the motor and venting air.

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