CN116633081A - Magnetic suspension high-speed blower with rotor spindle heat dissipation air duct - Google Patents
Magnetic suspension high-speed blower with rotor spindle heat dissipation air duct Download PDFInfo
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- CN116633081A CN116633081A CN202310646469.1A CN202310646469A CN116633081A CN 116633081 A CN116633081 A CN 116633081A CN 202310646469 A CN202310646469 A CN 202310646469A CN 116633081 A CN116633081 A CN 116633081A
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- 230000017525 heat dissipation Effects 0.000 title claims abstract description 151
- 239000000725 suspension Substances 0.000 title claims abstract description 30
- 238000005339 levitation Methods 0.000 claims description 17
- 230000000694 effects Effects 0.000 abstract description 5
- 229910000831 Steel Inorganic materials 0.000 description 15
- 239000010959 steel Substances 0.000 description 15
- 238000001816 cooling Methods 0.000 description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
- F04D29/058—Bearings magnetic; electromagnetic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
- F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/626—Mounting or removal of fans
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
- H02K5/207—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium with openings in the casing specially adapted for ambient air
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/003—Couplings; Details of shafts
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application relates to a magnetic suspension high-speed blower with a rotor spindle heat dissipation air duct, and belongs to the field of heat dissipation of motor rotors. The fan comprises a rotor main shaft, a stator, a magnetic bearing and a main impeller, wherein a permanent magnet is arranged outside the rotor main shaft; the front end of the rotor main shaft is provided with a main impeller, and an impeller fixing cone penetrates through the main impeller and is fixed in the rotor main shaft; an auxiliary air inlet disc is arranged at the rear end of the rotor spindle; and the impeller fixing cone, the rotor spindle and the auxiliary air inlet disc are provided with a heat dissipation air duct. When the magnetic suspension high-speed motor drives the main impeller to rotate, air enters the heat dissipation channel from the auxiliary air inlet disc under the action of pressure difference, heat generated by the permanent magnet is taken away from the inside of the rotor main shaft, and finally the heat is discharged to the outside from the impeller fixing cone. According to the magnetic suspension high-speed blower provided by the application, the self-suction mode is adopted to radiate the rotor of the motor, so that the radiating effect on the rotor spindle can be improved, and the radiating cost is reduced.
Description
Technical Field
The application relates to a magnetic suspension high-speed blower with a rotor spindle heat dissipation air duct, and belongs to the field of heat dissipation of motor rotors.
Background
In the magnetic suspension high-speed motor, the magnetic steel arranged on the rotor main shaft is mainly neodymium iron boron or samarium cobalt, and the neodymium iron boron or samarium cobalt is a magnetic material with high power density and small volume. Because the high-speed rotation of motor rotor, the heat that produces of rotor magnet steel is difficult to transfer out fast, causes the rotor overheated, has even caused the demagnetization of magnet steel owing to high temperature, leads to motor stator to need bigger electric current to move, can cause motor stator's further rising, can improve the temperature of rotor magnet steel again, so relapse, finally influence the steady operation of motor, and the high-efficient operation of motor is seriously influenced to the heat dissipation problem after the motor operation.
At present, the magnetic levitation high-speed motor rotor adopts two cooling modes of refrigerant and air cooling, the refrigerant cooling effect is good, but a separate refrigerant pipeline is needed, how to seal, prevent leakage, the control process is complex, and fault points are increased. When adopting the forced air cooling, simple structure does not pollute, but because the cooling channel sets up between rotor and stator, if increase cooling channel, can cause the magnetic leakage, influence motor efficiency and power's output.
In addition, the conventional heat dissipation method is not ideal for heat dissipation of the magnetic bearing coil and the motor stator coil.
Therefore, how to effectively improve the heat dissipation effect of the motor, simplify the heat dissipation device of the motor, and improve the performance of the motor is urgent for those skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the application provides the magnetic suspension high-speed air blower with the main shaft heat dissipation air duct and the rotor self-absorption cooling system, which can effectively solve the heat dissipation problem of the rotor, improve the stable operation of the motor and have the advantage of simple structure.
The technical scheme of the application is as follows:
a magnetic suspension high-speed blower with a rotor main shaft heat dissipation air duct comprises a machine shell, a rotor main shaft, a motor stator, a front radial magnetic bearing, a rear radial magnetic bearing, an axial magnetic bearing and a main impeller;
the motor stator and the rotor main shaft are arranged in a complete set of matching way, and a front radial magnetic bearing, a rear radial magnetic bearing and an axial magnetic bearing are sleeved outside the rotor main shaft in sequence; the rotor spindle is sleeved with a thrust disc, and the thrust disc is arranged between the axial magnetic bearings;
a volute is arranged at one end of the rotor main shaft, a main impeller is arranged in the volute, and an impeller fixing cone penetrates through the main impeller to fix the main impeller at the end part of the rotor main shaft; an auxiliary air inlet disc is arranged at the other end of the rotor main shaft;
and the impeller fixing cone, the rotor spindle and the auxiliary air inlet disk are provided with spindle heat dissipation air channels.
When the magnetic suspension high-speed motor drives the main impeller to rotate, a negative pressure area is formed at the air inlet of the main impeller, a high pressure area is formed at the air outlet of the main impeller, air enters the heat dissipation channel from the auxiliary air inlet disc under the action of pressure difference, heat generated by the permanent magnet is taken away from the inside of the rotor main shaft, and finally the heat is discharged from the impeller fixing cone.
The magnetic suspension high-speed blower with the rotor spindle heat dissipation air duct provided by the application dissipates heat of the rotor spindle of the motor in a self-priming mode, and reduces the cost of dissipating heat of the rotor spindle.
According to the application, the auxiliary air inlet disc is provided with a first axial heat dissipation hole and a plurality of first air inlet holes, and the first air inlet holes are communicated with the first axial heat dissipation hole;
a first axial heat dissipation through hole is formed in the rotor spindle;
the impeller fixing cone is provided with a second axial heat dissipation hole and a plurality of exhaust holes, and the second axial heat dissipation hole is communicated with the exhaust holes;
the first air inlet hole, the first axial heat dissipation through hole, the second axial heat dissipation hole and the exhaust hole form a heat dissipation air channel.
The principle of the heat radiation structure provided by the application is as follows: when the high-speed magnetic suspension motor drives the main impeller to rotate, a negative pressure area is formed at the air inlet of the main impeller, a high pressure area is formed at the outlet of the main impeller, the rotor main shaft is hollow, the air inlet auxiliary air inlet channel is provided with a first air inlet hole and is connected with the atmosphere, the pressure of the air inlet auxiliary air inlet channel of the rotor main shaft is higher than that of the air outlet auxiliary air outlet channel at the side of the main impeller of the rotor main shaft, and the air can take away the heat of the magnetic steel of the rotor main shaft along the rotor main shaft to avoid overheating of the magnetic steel of the rotor main shaft.
According to the application, preferably, the first air inlet hole forms an obtuse angle alpha with a tangent line at the first air inlet hole, when the high-speed magnetic levitation motor drives the main impeller to rotate, air enters the heat dissipation air channel from the first air inlet hole under the action of pressure difference, and finally is discharged from the air outlet hole.
The first air inlet arranged on the rotor main shaft plays a role in guiding flow, air can enter the heat dissipation air channel from the first air inlet, enters the center of the rotor main shaft, and can take away heat of the rotor main shaft magnetic steel along the rotor main shaft, so that the rotor main shaft magnetic steel is prevented from being overheated. The structure is simpler, the cost is reduced, and the assembly is more convenient.
According to the application, preferably, the obtuse angle alpha formed between the first air inlet and the tangent line of the first air inlet is 135 degrees, when the high-speed magnetic levitation motor drives the main impeller to rotate, air enters the heat dissipation air duct from the first air inlet under the action of pressure difference, and finally is discharged from the exhaust hole.
According to the present application, the auxiliary intake plate is preferably provided with four first intake holes in the radial direction.
The auxiliary air inlet disc can be conveniently arranged on the rotor spindle.
According to the present application, preferably, the auxiliary air intake plate is fixed to the rear end of the rotor main shaft by bolts.
The auxiliary air inlet disc is arranged so as not to influence the assembly between the rotor and the magnetic bearing, and gas can be led into the heat dissipation air duct.
According to the application, the impeller fixing cone is preferably provided with four exhaust holes, and the exhaust holes are perpendicular to the axis of the second axial heat dissipation hole.
The position of the exhaust hole is arranged at the negative pressure air inlet end in the main impeller, the exhaust hole can play a role in drainage and air guide under the action of pressure difference, the resistance of air flow is reduced, and the heat generated by the rotor main shaft is better taken away. Considering the size of the second axial radiating hole in the impeller fixing cone, the four exhaust holes are arranged for processing more conveniently.
According to the magnetic suspension high-speed blower, the axis of the first axial heat dissipation through hole, the axis of the second axial heat dissipation hole and the axis of the first axial heat dissipation hole are on the same straight line.
On one hand, the main impeller is fixed on the main shaft of the rotor, so that the requirement of concentricity is met; on the other hand, the heat dissipation air duct formed in the rotor main shaft can better take away the heat of the permanent magnet on the rotor main shaft.
According to a preferred embodiment of the application, the second axial heat dissipation bores and the first axial heat dissipation bores are both blind axial bores.
According to the application, the magnetic suspension high-speed blower is also provided with a magnetic bearing heat dissipation air duct, wherein the magnetic bearing heat dissipation air duct comprises a first magnetic bearing heat dissipation air duct, a second magnetic bearing heat dissipation air duct and a third magnetic bearing heat dissipation air duct,
the shell is provided with a first air inlet, a second air inlet, a first air outlet, a second air outlet and a third air outlet,
the air provided by the external fan enters the shell through the first air inlet, flows out of the first air outlet after passing through a gap between the front radial magnetic bearing and the magnetic bearing rotor, and thus a first magnetic bearing heat dissipation air channel is formed;
the air provided by the external fan enters the shell through the second air inlet, and a part of the air flows out through the second air outlet after passing through the gap between the rear radial magnetic bearing and the magnetic bearing rotor, so that a second magnetic bearing heat dissipation air channel is formed; meanwhile, the other part of wind flows out from the third air outlet through the heat dissipation holes arranged on the axial magnetic bearing, so that a third magnetic bearing heat dissipation air channel is formed.
According to the application, the first air inlet is arranged between the front radial magnetic bearing and the front end cover, and the first air outlet is arranged between the front radial magnetic bearing and the motor stator;
the second air inlet is arranged between the rear radial magnetic bearing and the axial magnetic bearing, and the second air outlet is arranged between the rear radial magnetic bearing and the motor stator;
the third air outlet is arranged between the axial magnetic bearing and the rear end cover.
According to the application, the rotor main shaft is also provided with a plurality of second air inlets which are communicated with the first axial heat dissipation through holes; when the high-speed magnetic suspension motor drives the main impeller to rotate, air enters the heat dissipation air channel from the second air inlet under the action of pressure difference, and is finally discharged from the air outlet.
According to a preferred embodiment of the application, the second air inlet opening is arranged between the magnetic bearing rotor and the thrust disk.
The beneficial effects of the application are as follows:
1. the application provides a magnetic suspension high-speed blower with a rotor main shaft heat dissipation air duct, wherein a rotor main shaft of the high-speed blower adopts a self-absorption cooling mode, when a high-speed magnetic suspension motor drives a main impeller to rotate, a negative pressure area is formed at an air inlet of the main impeller, a high pressure area is formed at an outlet of the main impeller, the rotor main shaft is hollow and is communicated with the atmosphere, and air can take away heat of rotor main shaft magnetic steel along the rotor main shaft, so that the rotor main shaft magnetic steel is prevented from overheating.
2. In the heat dissipation air duct provided by the application, air enters the second axial heat dissipation hole in the rotor main shaft through the first air inlet hole and the first axial heat dissipation through hole of the auxiliary air inlet disc, takes away heat generated by the rotor, passes through the second axial heat dissipation hole of the impeller fixing cone, and finally is discharged out of the heat dissipation air duct through the exhaust hole.
3. According to the application, the air inlet and the air outlet are arranged on the shell to form the magnetic bearing heat dissipation air channel, so that the magnetic bearing and the coil of the motor stator can be fully dissipated, and meanwhile, a part of air can enter the rotor main shaft through the second air inlet, so that the heat dissipation effect on the rotor main shaft is improved.
Drawings
FIG. 1 is a schematic diagram of a partial structure of a magnetic levitation high-speed blower with a rotor spindle heat dissipation air duct;
FIG. 2 is an axial cross-sectional schematic view of an auxiliary intake plate;
FIG. 3 is a radial schematic view of an auxiliary intake plate;
FIG. 4 is a radial schematic view of an impeller retention cone;
FIG. 5 is an axial cross-sectional schematic view of an impeller retention cone;
FIG. 6 is a schematic diagram of a magnetic levitation high-speed blower with a rotor spindle heat dissipation air duct;
FIG. 7 is another schematic diagram of a magnetic levitation high-speed blower with a rotor spindle heat dissipation air duct;
FIG. 8 is another partial schematic diagram of a magnetic levitation high-speed blower with a rotor spindle heat dissipation air duct;
fig. 9 is a partial enlarged view of the a region pair.
1. The device comprises a first air inlet hole, 2, a first axial heat dissipation through hole, 3, a permanent magnet, 4, a sheath, 5, a main impeller, 6, an exhaust hole, 7, an auxiliary air inlet disc, 8, a second axial heat dissipation hole, 9, an impeller fixing cone, 10, a first axial heat dissipation hole, 11, a rotor main shaft, 12, an axial magnetic bearing, 13, a front radial magnetic bearing, 14, a motor stator, 15, a volute, 16, a thrust disc, 17, a first air inlet, 18, a second air inlet, 19, a first air outlet, 20, a second air outlet, 21, a third air outlet, 22, a second air inlet, 23, a magnetic bearing rotor, 24, a back plate, 25, a front end cover, 26, a back end cover, 27, a casing, 28 and a rear radial magnetic bearing.
Detailed Description
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.
Unless defined otherwise, all directions, such as up, down, left, right, etc., referred to herein are based on the directions shown in fig. 1 of the present embodiment, and if the specific gesture changes, the directional indication changes accordingly. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Furthermore, in various embodiments of the present disclosure, the same or similar reference numerals denote the same or similar components.
In the present application, unless explicitly specified and limited otherwise, the terms "coupled," "affixed," and the like are to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed, unless otherwise explicitly specified. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of the claimed application.
Example 1
The embodiment provides a magnetic suspension high-speed blower with a rotor main shaft radiating air duct, which is shown in fig. 1 and 6 and comprises a shell 27, a rotor main shaft 11, a motor stator 14, a front radial magnetic bearing 13, a rear radial magnetic bearing 28, an axial magnetic bearing 12 and a main impeller 5; the displacement sensor is not shown in the figures.
The motor stator 14 and the rotor main shaft 44 are matched and installed in a complete set, and a front radial magnetic bearing 13, a rear radial magnetic bearing 28 and an axial magnetic bearing 12 are sleeved outside the rotor main shaft 11 in sequence; a thrust disc 16 is sleeved on the rotor main shaft 11, and the thrust disc 16 is arranged between the axial magnetic bearings 12;
the rotor main shaft 11 is sleeved with a permanent magnet 3, and the outer part of the permanent magnet 3 is sleeved with a sheath 4;
one end of the rotor main shaft 11 is provided with a volute 15, a main impeller 5 is arranged in the volute 15, and an impeller fixing cone 9 penetrates through the main impeller 5 and is fixed at the end part of the rotor main shaft 11; the impeller fixing cone 9 is in threaded connection with the rotor spindle 11, so that the main impeller 5 is fixed on the rotor spindle 11, and meanwhile, the main impeller 5 is in key connection with the rotor spindle 11.
The rear end of the rotor main shaft 11 is provided with an auxiliary air inlet disc 7; the impeller fixing cone 9, the rotor main shaft 11 and the auxiliary air inlet disk 7 are provided with heat dissipation air channels; the permanent magnet 3 may be selected from magnetic steel or other magnetic materials.
When the magnetic suspension high-speed motor drives the main impeller 5 to rotate, a negative pressure area is formed at the air inlet of the main impeller 5, a high pressure area is formed at the air outlet of the main impeller 5, air enters a heat dissipation channel from the auxiliary air inlet disc 7 under the action of pressure difference, heat generated by the permanent magnet 3 is taken away from the inside of the rotor main shaft 11, and finally the heat is discharged to the outside from the impeller fixing cone 9.
The magnetic suspension high-speed blower with the rotor spindle heat dissipation air duct provided by the application dissipates heat of the rotor spindle 11 of the motor in a self-priming mode, and reduces the heat dissipation cost of the rotor spindle 11.
The heat dissipation method of the magnetic suspension high-speed blower according to the embodiment of the application is described with reference to a schematic diagram of a flow path in the magnetic suspension high-speed blower with a rotor spindle heat dissipation air path shown in fig. 1:
when the motor is started, the rotor main shaft 11 drives the main impeller 5 to rotate, a negative pressure area is formed at the air inlet end of the impeller, a high pressure area is formed at the air outlet end of the impeller, the air outlet hole 6 of the rotor main shaft 11 is arranged in the negative pressure area, the air outlet hole is in a negative pressure state, the first air inlet hole 1 at the rear end of the rotor main shaft 11 is at atmospheric pressure, a pressure difference exists between the first air inlet hole 1 and the air outlet hole 6, cooling air enters the main shaft heat dissipation air channel through the first air inlet hole 1, passes through the first axial heat dissipation through hole 2 in the center of the rotor main shaft 11, heat generated by the permanent magnet 3 is taken away, and cooling of the motor main shaft 11 is realized.
Example 2
This example is different from example 1 in that, as a specific embodiment, it is based on example 1: as shown in fig. 2, a first axial heat dissipation hole 10 and a plurality of first air inlet holes 1 are formed in the auxiliary air inlet disc 7, and the first air inlet holes 1 are communicated with the first axial heat dissipation hole 10;
a first axial heat dissipation through hole 2 is formed in the rotor main shaft 11;
the impeller fixing cone 9 is provided with a second axial heat dissipation hole 8 and a plurality of exhaust holes 6, and the second axial heat dissipation hole 8 is communicated with the exhaust holes 6;
the first air inlet hole 1, the first axial heat dissipation hole 10, the first axial heat dissipation through hole 2, the second axial heat dissipation hole 8 and the air outlet hole 6 form a heat dissipation air channel.
Specifically, the first axial heat radiation holes 10 and the first intake holes 1 are communicated with each other in the auxiliary intake plate 7.
Inside the rotor spindle 11, the first axial heat dissipation through hole 2 is a through hole penetrating through the front and rear ends of the rotor, one end of the first axial heat dissipation through hole 2 is communicated with the first axial heat dissipation hole 10, and the other end of the first axial heat dissipation through hole 2 is communicated with the second axial heat dissipation hole 8 in the impeller fixing cone 9.
In the impeller fixing cone 9, the second axial heat radiation hole 8 communicates with the air discharge hole 6.
When the high-speed magnetic suspension motor drives the main impeller 5 to rotate, a negative pressure area is formed at the air inlet of the main impeller 5, a high-pressure area is formed at the outlet of the main impeller 5, the rotor main shaft 11 is hollow, under the action of the negative pressure, air led in through the first air inlet hole 1 enters the interior of the rotor main shaft 11 through the first axial heat dissipation holes 10, when the air flows through the interior of the rotor, heat generated by magnetic steel on the rotor main shaft 11 is taken away, and air with heat is discharged through the second axial heat dissipation holes 8 and finally discharged through the air exhaust holes 6 and enters the atmosphere, so that the heat of the rotor main shaft 11 is taken away.
The diameter of the first axial heat dissipation through hole 2 is determined according to the requirements of fans with different powers on the motor rotating speed and the strength of the motor rotor, so that the diameter of the first axial heat dissipation through hole 2 formed in the center of the rotor is determined, and the heat dissipation requirement of the rotor main shaft 11 can be realized under the condition that the requirements of the rotating speed and the strength are met by the rotor main shaft 11. The first axial heat dissipation through hole 2 is formed in the center of the rotor main shaft 11, so that the weight of the rotor main shaft 11 can be reduced.
Example 3
This embodiment differs from embodiments 1 and 2 as another embodiment on the basis of embodiments 1 and 2 in that: as shown in fig. 2 and 3, the tangent line of the first air inlet hole 1 and the first air inlet hole 1 forms an obtuse angle alpha, when the high-speed magnetic levitation motor drives the main impeller 5 to rotate, air enters the heat dissipation air channel from the outside through the first air inlet hole 1 under the action of pressure difference, and is finally discharged through the air outlet hole 6.
The first air inlet hole 1 arranged on the rotor main shaft 11 plays a role in guiding flow, air can enter the heat dissipation air channel from the first air inlet hole 1 and enter the center of the rotor main shaft 11, and the air can take away heat of magnetic steel of the rotor main shaft 11 along the rotor main shaft 11, so that the magnetic steel of the rotor main shaft 11 is prevented from overheating.
The included angle between the first air inlet hole 1 and the horizontal direction is larger than 90 degrees and smaller than 180 degrees, that is, the first air inlet hole 1 is arranged in an inclined direction, so that gas can enter the heat dissipation air channel from the first axial heat dissipation hole 10 when the rotor main shaft 11 rotates, and the rotor main shaft 11 has a cylindrical structure, so that under the condition of rotating, suction force in the inclined direction is easier to generate under the condition of arranging the heat dissipation air channel.
In an actual application scenario, the included angle α may be determined according to comprehensive consideration of the diameter and number of the first axial heat dissipation holes 10, the flow design value of the fan, the air volume of the fan, and the like.
The structure is simpler, the whole volume of the motor is reduced, the cost is reduced, and the assembly is more convenient.
Example 4
This embodiment differs from embodiment 3 as another embodiment on the basis of embodiment 3 in that: as shown in fig. 3, when the high-speed magnetic levitation motor drives the main impeller 5 to rotate, the first air inlet 1 forms an obtuse angle alpha of 135 degrees with a tangent line at the first air inlet 1, so that air enters the heat dissipation air channel from the first air inlet 1 under the action of pressure difference, and is finally discharged from the air outlet 6.
Wherein the flow direction of the gas entering the first heat dissipation through hole from the first air intake hole 1 is opposite to the direction in which the rotor main shaft 11 rotates.
As another embodiment, the auxiliary intake disc 7 is provided with four first intake holes 1 in the radial direction.
Example 5
This embodiment differs from embodiment 1 as another embodiment on the basis of embodiment 1 in that:
the auxiliary intake plate 7 is fixed to the rear end of the rotor main shaft 11 by bolts. The auxiliary air inlet disc is arranged so as not to influence the assembly between the rotor and the magnetic bearing, and gas can be led into the heat dissipation air duct.
Example 6
This embodiment differs from embodiment 2 as another embodiment on the basis of embodiment 2 in that:
as shown in fig. 4 and 5, the impeller fixing cone 9 is provided with four exhaust holes 6. The four exhaust holes 6 are uniformly distributed on the end part of the impeller fixing cone 9.
Further, as an embodiment, the exhaust hole 6 is perpendicular to the axis of the second axial heat dissipation hole 8.
The position of the exhaust hole 6 is arranged at the negative pressure air inlet end in the main impeller 5, the exhaust hole 6 can play a role in drainage and air guide under the action of pressure difference, the resistance of air flow is reduced, and the heat generated by the rotor main shaft 11 is better taken away. Considering the size of the second axial radiating hole in the impeller fixing cone, the four exhaust holes are arranged for processing more conveniently.
Example 7
This embodiment differs from embodiment 2 as another embodiment on the basis of embodiment 2 in that:
as shown in fig. 1, in the magnetic levitation high-speed blower, the axis of the first axial heat dissipation hole 2, the axis of the second axial heat dissipation hole 8 and the axis of the first axial heat dissipation hole 10 are on the same straight line.
On the one hand, the main impeller 5 is fixed on the rotor main shaft 11, so as to meet the concentricity requirement; on the other hand, the heat dissipation air duct formed in the rotor main shaft 11 can better take away the heat of the permanent magnet 3 on the rotor main shaft 11.
Example 8
This embodiment differs from embodiment 2 as another embodiment on the basis of embodiment 2 in that:
as shown in fig. 5 and 2, the second axial heat dissipation holes 8 and the first axial heat dissipation holes 10 are both blind axial holes.
The impeller fixing cone 9 penetrates the main impeller 5, and the impeller fixing cone 9 is fixed in the first axial heat radiation through hole 2.
When the high-speed magnetic levitation motor drives the main impeller 5 to rotate, a negative pressure area is formed at the air inlet of the main impeller 5, a high-pressure area is formed at the outlet of the main impeller 5, the rotor main shaft 11 is hollow, the first axial heat dissipation holes 10 are axial blind holes, and under the action of negative pressure, gas introduced through the first air inlet holes 1 can enter the rotor main shaft 11 through the first axial heat dissipation holes 10.
When the air flows through the interior of the rotor, heat generated by the magnetic steel on the rotor main shaft 11 is taken away, and air with heat passes through the second axial heat dissipation holes 8. Since the first axial heat dissipation hole 10 is an axial blind hole, the exhaust hole 6 is finally discharged and enters the atmosphere to take away the heat of the rotor spindle 11.
Example 9
This embodiment differs from embodiment 2 as another embodiment on the basis of embodiment 2 in that:
as shown in fig. 6, the magnetic levitation high-speed blower is further provided with a magnetic bearing heat dissipation air duct, the magnetic bearing heat dissipation air duct comprises a first magnetic bearing heat dissipation air duct, a second magnetic bearing heat dissipation air duct and a third magnetic bearing heat dissipation air duct,
the shell 27 is provided with a first air inlet 17, a second air inlet 18, a first air outlet 19, a second air outlet 20 and a third air outlet 21,
the air provided by the external fan enters the shell 27 through the first air inlet 17, flows out through the first air outlet 19 after passing through the gap between the front radial magnetic bearing 13 and the magnetic bearing rotor 23, and forms a first magnetic bearing heat dissipation air channel;
the air provided by the external fan enters the shell 27 through the second air inlet 18, and a part of the air flows out from the second air outlet 20 after passing through the gap between the rear radial magnetic bearing 28 and the magnetic bearing rotor 23, so that a second magnetic bearing heat dissipation air channel is formed; meanwhile, another part of the wind passes through a heat dissipation hole, which is not shown in the figure, arranged on the axial magnetic bearing 12 and flows out from the third air outlet 21, so that a third magnetic bearing heat dissipation air channel is formed.
Example 10
This embodiment differs from embodiment 9 as another embodiment on the basis of embodiment 9 in that:
as shown in fig. 6 and 9, the first air inlet 17 is disposed between the front radial magnetic bearing 13 and the front end cover 25, and the first air outlet 19 is disposed between the front radial magnetic bearing 13 and the motor stator 14; it should be noted that, the two ends of the motor are respectively provided with a front end cover 25 and a rear end cover 26, the front end cover 25 is also provided with a back plate 24, and the volute 15 is fixed on the back plate 24.
The second air inlet 18 is arranged between the rear radial magnetic bearing 28 and the axial magnetic bearing 12, and the second air outlet 20 is arranged between the rear radial magnetic bearing 28 and the motor stator 14;
the third air outlet 24 is disposed between the axial magnetic bearing 12 and the rear end cap 26.
Example 11
This embodiment is different from embodiment 2 or embodiment 9 as another embodiment in that:
as shown in fig. 8 and 7, the rotor main shaft 11 is further provided with a plurality of second air inlet holes 22, and the second air inlet holes 22 are communicated with the first axial heat dissipation through holes 2; referring to fig. 3, when the high-speed magnetic levitation motor drives the main impeller to rotate, air enters the heat dissipation air channel from the second air inlet 22 under the action of pressure difference, and is finally discharged from the air outlet 6. The arrangement of the second air inlet hole 22 can increase the air inlet quantity inside the rotor main shaft 11, so that the rotor main shaft 11 can be better cooled, and the cooling effect on the rotor main shaft 11 is improved.
Specifically, four second air inlets 22 are uniformly arranged on the rotor main shaft 11, and beta can take a value of 135 degrees, and the principle is similar to that of the first air inlets 1.
Example 12
This embodiment differs from embodiment 10 as another embodiment in that:
the second air intake hole 22 is provided between the magnetic bearing rotor 23 and the thrust disk 16, and can radiate heat well inside the rotor spindle 11 on the premise of ensuring the strength of the rotor spindle 11.
While the foregoing description illustrates and describes the preferred embodiments of the present application, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes within the scope of the inventive subject matter, either as a result of the foregoing teachings or as a result of the knowledge or knowledge of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the application are intended to be within the scope of the appended claims.
Claims (9)
1. The application provides a magnetic suspension high-speed blower with a rotor main shaft heat dissipation air duct, which is characterized by comprising a machine shell, a rotor main shaft, a motor stator, a front radial magnetic bearing, a rear radial magnetic bearing, an axial magnetic bearing and a main impeller, wherein the machine shell is provided with a rotor main shaft heat dissipation air duct;
the front radial magnetic bearing, the motor stator, the rear radial magnetic bearing and the axial magnetic bearing are sleeved outside the rotor spindle in sequence; the rotor spindle is sleeved with a thrust disc, and the thrust disc is arranged between the axial magnetic bearings;
one end of the rotor main shaft is provided with a volute in a rotating way, a main impeller is arranged in the volute, and an impeller fixing cone penetrates through the main impeller to fix the main impeller at the end part of the rotor main shaft; an auxiliary air inlet disc is arranged at the other end of the rotor main shaft;
and the impeller fixing cone, the rotor spindle and the auxiliary air inlet disk are provided with spindle heat dissipation air channels.
2. The magnetic suspension high-speed blower with the rotor spindle heat dissipation air duct of claim 1, wherein the auxiliary air inlet disc is provided with a first axial heat dissipation hole and a plurality of first air inlet holes, and the first air inlet holes are communicated with the first axial heat dissipation holes;
a first axial heat dissipation through hole is formed in the rotor spindle;
the impeller fixing cone is provided with a second axial heat dissipation hole and a plurality of exhaust holes, and the second axial heat dissipation hole is communicated with the exhaust holes;
the first air inlet hole, the first axial heat dissipation through hole, the second axial heat dissipation hole and the exhaust hole form a heat dissipation air channel.
3. The magnetic suspension high-speed blower with the rotor spindle heat dissipation air channel according to claim 2, wherein the first air inlet hole forms an obtuse angle alpha with a tangent line at the first air inlet hole, when the high-speed magnetic suspension motor drives the main impeller to rotate, air enters the heat dissipation air channel from the first air inlet hole under the action of pressure difference, and finally is discharged from the air outlet hole.
4. A magnetic levitation high-speed blower with rotor spindle heat dissipation air duct as in claim 2, wherein the auxiliary air intake plate is provided with four first air intake holes in radial direction.
5. The magnetic suspension high-speed blower with the rotor spindle heat dissipation air duct according to claim 2, wherein the impeller fixing cone is provided with four exhaust holes, and the exhaust holes are perpendicular to the axis of the second axial heat dissipation holes.
6. The magnetic levitation high-speed blower with rotor spindle heat dissipation air duct of claim 2, wherein the axis of the first axial heat dissipation through hole, the axis of the second axial heat dissipation hole and the axis of the first axial heat dissipation hole are on the same straight line.
7. The magnetic levitation high-speed blower with rotor spindle heat dissipation air duct of claim 2, wherein the second axial heat dissipation hole and the first axial heat dissipation hole are both blind axial holes.
8. The magnetic suspension high-speed blower with the rotor spindle heat dissipation air duct according to claim 2, wherein the rotor spindle is further provided with a plurality of second air inlets which are communicated with the first axial heat dissipation through holes; when the high-speed magnetic suspension motor drives the main impeller to rotate, air enters the heat dissipation air channel from the second air inlet under the action of pressure difference, and is finally discharged from the air outlet.
9. The magnetic levitation high-speed blower with rotor spindle heat dissipation air duct of claim 8, wherein the second air inlet aperture is located between the magnetic bearing rotor and the thrust disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310646469.1A CN116633081A (en) | 2023-06-02 | 2023-06-02 | Magnetic suspension high-speed blower with rotor spindle heat dissipation air duct |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310646469.1A CN116633081A (en) | 2023-06-02 | 2023-06-02 | Magnetic suspension high-speed blower with rotor spindle heat dissipation air duct |
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| CN116633081A true CN116633081A (en) | 2023-08-22 |
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| CN202310646469.1A Pending CN116633081A (en) | 2023-06-02 | 2023-06-02 | Magnetic suspension high-speed blower with rotor spindle heat dissipation air duct |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118214243A (en) * | 2024-05-21 | 2024-06-18 | 云梦山(常州)科技有限公司 | New energy automobile motor with heat dissipation power self-regulating function |
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