CN116742879A - Air-cooled heat radiation structure and magnetic levitation motor - Google Patents
Air-cooled heat radiation structure and magnetic levitation motor Download PDFInfo
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- CN116742879A CN116742879A CN202310556018.9A CN202310556018A CN116742879A CN 116742879 A CN116742879 A CN 116742879A CN 202310556018 A CN202310556018 A CN 202310556018A CN 116742879 A CN116742879 A CN 116742879A
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- cooling
- air
- backflow
- impeller
- rotor
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- 238000005339 levitation Methods 0.000 title claims abstract description 18
- 230000005855 radiation Effects 0.000 title description 2
- 238000001816 cooling Methods 0.000 claims abstract description 125
- 230000017525 heat dissipation Effects 0.000 claims abstract description 75
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052782 aluminium Inorganic materials 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 17
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000003749 cleanliness Effects 0.000 abstract description 12
- 238000010992 reflux Methods 0.000 abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- 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
- H02K5/15—Mounting arrangements for bearing-shields or end plates
-
- 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
- H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N15/00—Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The application relates to the technical field of magnetic levitation motors, and provides an air-cooled heat dissipation structure and a magnetic levitation motor, wherein the air-cooled heat dissipation structure comprises a shell and a rotor, a cavity is arranged in the shell, the rotor is arranged in the cavity and extends along a first direction, and the air-cooled heat dissipation structure also comprises a first impeller which is positioned in the cavity and fixedly connected with the rotor; the shell is internally provided with a backflow channel, the inner side wall of the shell is provided with a backflow hole communicated with the cavity, and the periphery of the rotor is provided with a cooling channel; the inlet of the first impeller is communicated with the backflow flow channel, the outlet of the first impeller is communicated with the cooling flow channel, and the backflow flow channel and the cooling flow channel are both communicated with the backflow hole. The air cooling heat dissipation structure can provide power for air internal circulation without an additional driving circuit and a control device, and the reflux flow channel and the cooling flow channel form an internal circulation flow channel which is not in contact with the outside through the reflux hole and the first impeller, so that the dryness and the cleanliness of the inside of the motor are ensured; the return flow channel arranged in the shell can also realize good heat dissipation.
Description
Technical Field
The application relates to the technical field of magnetic levitation motors, in particular to an air-cooling heat dissipation structure and a magnetic levitation motor.
Background
The magnetic suspension motor has the characteristics of no friction, small loss, low maintenance cost and the like, and is increasingly used for driving pneumatic equipment such as an air compressor, a blower and the like. Because the magnetic suspension motor generates a large amount of heat due to electromagnetic loss and high-speed windage loss in the normal operation process, the temperature inside the motor is too high, and the problems of demagnetization of a permanent magnet, reduction of the control precision of a magnetic suspension bearing and the like are easy to occur.
At present, in order to ensure the normal use of the magnetic levitation motor in various complex environments, the temperature is mostly reduced by a water cooling or air cooling mode. The water cooling may have a leakage risk, and the cooling water pipe needs to be externally connected with an external water tower, so that the structure cannot be used in an application scene without the water tower. In addition, during the forced air cooling, the air intake is linked together with outside generally, and the inside dryness degree of motor, cleanliness factor can not guarantee.
Disclosure of Invention
The application aims to provide an air-cooling heat dissipation structure and a magnetic levitation motor, which are used for solving the technical problem that the dryness and cleanliness of the interior of the motor cannot be ensured when the existing magnetic levitation motor dissipates heat in an air-cooling mode.
An embodiment of a first aspect of the present application provides an air-cooled heat dissipation structure, including a housing, a rotor, and a first impeller, wherein a cavity is provided in the housing, the rotor is provided in the cavity and extends along a first direction, and the air-cooled heat dissipation structure further includes the first impeller is positioned in the cavity and fixedly connected to the rotor;
a backflow flow passage is arranged in the shell, backflow holes communicated with the cavity are formed in the inner side wall of the shell, and a cooling flow passage is formed in the peripheral side of the rotor;
the inlet of the first impeller is communicated with the backflow flow channel, the outlet of the first impeller is communicated with the cooling flow channel, and the backflow flow channel and the cooling flow channel are both communicated with the backflow hole.
In an embodiment, the air-cooled heat dissipation structure further comprises a stator sleeved on the rotor and a diversion aluminum sleeve sleeved on the stator, a plurality of diversion holes extending along the first direction are formed in the diversion aluminum sleeve, one end of each diversion hole is communicated with the cooling flow passage, and the other end of each diversion hole is communicated with the backflow flow passage.
In an embodiment, the plurality of the flow guiding holes are uniformly distributed along the circumference of the flow guiding aluminum sleeve.
In an embodiment, the air-cooled heat dissipation structure comprises a rear bearing shell, a stator, an axial bearing, a front radial bearing and a front bearing shell which are sequentially sleeved on the rotor along the first direction, wherein the rear bearing shell, the stator, the axial bearing, the front radial bearing and the front bearing shell are fixedly connected to the shell, cooling channels extending along the first direction are formed in the rear bearing shell and the axial bearing, cooling gaps are formed between the stator, the front radial bearing and the front bearing shell and the rotor, the backflow holes comprise first backflow holes, and the first backflow holes are positioned on one side of the shell away from the first impeller;
the cooling flow passage comprises a first cooling air passage, and the first cooling air passage sequentially passes through an outlet of the first impeller, a cooling channel on the rear bearing housing, a cooling gap between the stator and the rotor, a cooling channel on the axial bearing, a cooling gap between the front radial bearing and the rotor, a cooling gap between the front bearing housing and the rotor, a first backflow hole, a backflow flow passage and an inlet of the first impeller.
In an embodiment, the backflow hole further comprises a second backflow hole arranged at a distance from the first backflow hole, and the second backflow hole is arranged opposite to the stator;
the cooling flow passage further comprises a second cooling air passage, and the second cooling air passage sequentially passes through the outlet of the first impeller, the cooling channel on the rear bearing shell, the cooling gap between the stator and the rotor, the diversion hole, the second backflow hole, the backflow flow passage and the inlet of the first impeller.
In an embodiment, the air-cooled heat dissipation structure further includes a plurality of fins spaced on an outer peripheral side of the housing and extending in the first direction.
In an embodiment, a flange perpendicular to the fins is arranged on the side wall of the shell in a surrounding manner, a drainage outlet is formed in the flange, and the drainage outlet is positioned between adjacent fins along the circumferential direction of the shell;
the air-cooled heat dissipation structure further comprises a volute and a second impeller, the volute is arranged at one end of the shell and is attached to the flange, an inner cavity of the volute is communicated with the drainage outlet, and the second impeller is located in the volute and is used for driving gas in the inner cavity to be guided between the adjacent fins through the drainage outlet.
In an embodiment, the shell comprises a rear-section shell and a main shell which are connected, a rear-section shell backflow channel is arranged on the shell wall of the rear-section shell, the first impeller is accommodated in the rear-section shell, and an inlet of the first impeller is communicated with the rear-section shell backflow channel;
the main machine shell comprises a plurality of sub machine shells which are sequentially connected along the first direction, sub backflow channels are arranged on the shell walls of the sub machine shells, adjacent sub backflow channels are in sealing connection, and the sub backflow channels are communicated with the backflow channels of the rear machine shell.
In one embodiment, one of the two adjacent sub-housings is provided with a runner interface for communicating with the sub-return runner, and the other is provided with a sealing joint, and the runner interface is in butt joint with the sealing joint to form a conical labyrinth sealing structure.
The air-cooled heat dissipation structure comprises a shell, a rotor and a first impeller which are arranged in the shell, a backflow runner which is arranged in the shell, and a cooling runner which is arranged in the shell and is formed on the periphery side of the rotor. Because the first impeller is fixedly connected with the rotor, when the rotor is driven to rotate, the first impeller and the rotor are synchronously started and stopped, and power can be provided for air internal circulation without additional driving circuits and control devices. In addition, the reflux flow channel and the cooling flow channel are communicated through the reflux hole and the first impeller to form an internal circulation flow channel which is not contacted with the outside, so that the dryness and the cleanliness of the inside of the motor are ensured; meanwhile, a good heat dissipation can be realized through a backflow runner arranged in the shell, so that the technical problem that the dryness and cleanliness of the inside of the motor cannot be guaranteed when the existing magnetic levitation motor dissipates heat in an air cooling mode is solved.
An embodiment of the second aspect of the present application further proposes a magnetic levitation motor, including an air-cooled heat dissipation structure as described in any embodiment of the first aspect.
The magnetic levitation motor realizes good heat dissipation through the air-cooled heat dissipation structure, can provide power for air internal circulation of the air-cooled heat dissipation structure without additional driving circuits and control devices, and saves energy. In addition, the internal circulation runner is not contacted with the outside, so that the dryness and the cleanliness of the inside of the motor can be ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of an air-cooled heat dissipation structure according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an internal structure of the air-cooled heat dissipation structure shown in FIG. 1;
FIG. 3 is a schematic diagram of a second internal structure of the air-cooled heat dissipating structure shown in FIG. 1;
fig. 4 is a schematic perspective view of a guiding aluminum sleeve in the air-cooled heat dissipation structure shown in fig. 2;
FIG. 5 is a schematic perspective view of another angle of the aluminum sleeve in the air-cooled heat dissipation structure shown in FIG. 4;
FIG. 6 is a schematic diagram of an internal structure of a guiding aluminum sleeve in the air-cooled heat dissipation structure shown in FIG. 4;
FIG. 7 is an exploded perspective view of the housing of the air-cooled heat dissipating structure of FIG. 2;
fig. 8 is a partial enlarged view of the structure shown in fig. 7 a.
The meaning of the labels in the figures is:
100. an air-cooled heat dissipation structure;
10. a housing; 11. a return flow path; 111. a first sub-return flow path; 112. a second sub-return flow path; 113. a third sub-return flow path; 12. a reflow hole; 121. a first reflow aperture; 122. a second reflow aperture; 13. a flange; 14. a drainage outlet; 15. a rear section housing; 151. a back section shell backflow runner; 16. a main housing; 161. a first sub-housing; 162. a third sub-housing; 17. a runner interface; 18. sealing the joint;
21. a rotor; 22. a stator; 23. a diversion aluminum sleeve; 231. a deflector aperture; 232. a convex portion; 24. a rear bearing housing; 25. an axial bearing; 251. a rear axial bearing; 252. a thrust plate; 253. a front axial bearing; 26. a front radial bearing; 27. a front bearing housing; 28. a rear radial bearing;
30. a first impeller; 301. an outlet; 302. an inlet;
40. a cooling flow passage; 41. a first cooling air path; 42. a second cooling air path;
50. a fin;
60. a volute;
71. a second impeller; 72. locking the pull rod; 73. and (3) a nut.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, and are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. 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.
An embodiment of a first aspect of the present application provides an air-cooled heat dissipation structure for heat dissipation of a magnetic levitation motor.
Referring to fig. 1 to 3, in an embodiment of the application, an air-cooled heat dissipation structure 100 includes a housing 10 and a rotor 21, a cavity is disposed in the housing 10, and the rotor 21 is disposed in the cavity and extends along a first direction (X direction in fig. 1). Wherein the rotor 21 is rotatable about an axis parallel to the first direction X.
The air-cooled heat dissipating structure 100 further includes a first impeller 30 positioned within the cavity and fixedly coupled to the rotor 21. Thus, when the rotor 21 is driven to rotate, the first impeller 30 and the rotor 21 are synchronously started and stopped, and no additional driving circuit or control device is needed, so that energy saving can be realized.
The shell 10 is provided with a backflow channel 11, the inner side wall of the shell 10 is provided with a backflow hole 12 communicated with the cavity, and the periphery of the rotor 21 is provided with a cooling channel 40; the inlet 302 of the first impeller 30 is in communication with the return flow passage 11, the outlet 301 of the first impeller 30 is in communication with the cooling flow passage 40, and both the return flow passage 11 and the cooling flow passage 40 are in communication with the return hole 12. That is, the return flow channel 11 and the cooling flow channel 40 are communicated through the return flow hole 12 and the first impeller 30 to form an internal circulation flow channel which is not in contact with the outside, and compared with the conventional air cooling heat dissipation, the dryness and cleanliness of the interior of the motor can be ensured.
In this embodiment, the first impeller 30 powers the circulation of the cooling flow path 40 and the return flow path 11. It will be appreciated that when the rotor 21 rotates, the first impeller 30 is driven to rotate, so that a leftward wind pressure is formed, the air in the cooling flow passage 40 flows leftward, and the air in the return flow passage 11 flows rightward, so as to power the air internal circulation. Referring to fig. 2, the first impeller 30 is defined to be located at the right end of the casing 10.
Since the return flow channel 11 is arranged in the shell 10, the gas in the return flow channel 11 can exchange heat with the shell 10 for cooling; the gas in the cooling flow passage 40 dissipates heat from the structure on the peripheral side of the rotor 21 to remove internal heat, thereby cooling the structure on the peripheral side of the rotor 21. That is, the internal heat of the housing 10 can be finally transferred to the outside of the housing 10 through the internal circulation flow channel, thereby realizing self-cooling heat dissipation.
The air-cooled heat dissipation structure 100 includes a casing 10, a rotor 21 and a first impeller 30 provided in the casing 10, a return flow passage 11 provided in the casing 10, and a cooling flow passage 40 provided in the casing 10 and formed on the peripheral side of the rotor 21. Because the first impeller 30 is fixedly connected to the rotor 21, when the rotor 21 is driven to rotate, the first impeller 30 and the rotor 21 are synchronously started and stopped, and power can be provided for air internal circulation without additional driving circuits and control devices. In addition, the reflux flow channel 11 and the cooling flow channel 40 are communicated through the reflux hole 12 and the first impeller 30 to form an internal circulation flow channel which is not contacted with the outside, so that the dryness and the cleanliness of the inside of the motor are ensured; meanwhile, the backflow runner 11 arranged on the shell 10 can also realize good heat dissipation, so that the technical problem that the dryness and cleanliness of the inside of the motor cannot be guaranteed when the existing magnetic levitation motor dissipates heat in an air cooling mode is solved.
Compared with the existing heat dissipation structure with the combined action of air cooling and water cooling, the air cooling heat dissipation structure 100 in the application does not need an external water cooling structure, can be used in an environment without a cooling water tower, and has the advantages of simple structure and low cost.
Since the heat generated by the motor is mainly concentrated at the stator 22, a large cooling air volume is required for the stator 22, but the excessive cooling air volume rubs against the rotor 21 rotating at a high speed, and the windmilling loss of the rotor 21 is increased. In order to reduce the wind abrasion loss of the rotor 21, referring to fig. 3 to 6, in an embodiment of the present application, the wind cooling heat dissipation structure 100 further includes a stator 22 sleeved on the rotor 21 and a guiding aluminum sleeve 23 sleeved on the stator 22, wherein a plurality of guiding holes 231 extending along the first direction X are formed in the guiding aluminum sleeve 23, one end of the guiding hole 231 is communicated with the cooling flow channel 40, and the other end is communicated with the backflow flow channel 11.
In this way, the heat exchange area of the stator 22 and other components can be increased through the diversion holes 231, and meanwhile, part of air quantity can be led out from the diversion holes 231, so that the friction between cold air in the cooling flow channel 40 and the rotor 21 on the left side of the stator 22 is reduced, and the windmilling loss of the rotor 21 is reduced.
In addition, the aluminum guide sleeve 23 further includes a protrusion 232, and the protrusion 232 abuts against the housing 10.
Further, referring to fig. 5, the plurality of diversion holes 231 are uniformly distributed along the circumference of the diversion aluminum jacket 23. In this way, the plurality of diversion holes 231 can effectively increase the heat exchange area of the stator assembly, and further improve the heat exchange efficiency; in addition, the guide aluminum sleeve 23 can guide a large amount of wind for heat dissipation of the stator 22 to the housing 10, and reduce the cooling wind quantity flowing to the left side of the stator 22, thereby reducing the wind abrasion loss of the rotor 21.
In addition, the guide aluminum sleeve 23 can also increase the mechanical strength of the stator 22, so that the stator is more durable and reliable.
It will be appreciated that in other embodiments of the application, the aluminum sleeve 23 may be omitted and the stator 22 directly secured to the housing 10, making it easier to manufacture and assemble. It is noted that the elimination of the aluminum sleeve 23 reduces the heat exchange area of the stator 22 and other components and increases the windmilling loss of the left rotor 21.
Referring to fig. 1 to 3, in an embodiment of the present application, an air-cooled heat dissipation structure 100 includes a rear bearing housing 24, a stator 22, an axial bearing 25, a front radial bearing 26 and a front bearing housing 27 sequentially sleeved on a rotor 21 along a first direction X, wherein the rear bearing housing 24, the stator 22, the axial bearing 25, the front radial bearing 26 and the front bearing housing 27 are all fixedly connected to a casing 10, cooling channels extending along the first direction X are respectively provided on the rear bearing housing 24 and the axial bearing 25, a cooling gap is provided between the stator 22, the front radial bearing 26 and the front bearing housing 27 and the rotor 21, a backflow hole 12 includes a first backflow hole 121, and the first backflow hole 121 is located on a side of the casing 10 away from a first impeller 30; the cooling flow path 40 includes a first cooling air path 41, and the first cooling air path 41 passes through the outlet 301 of the first impeller 30, the cooling passage P1 of the rear bearing housing 24, the cooling gap D1 between the stator 22 and the rotor 21, the cooling passage P2 of the axial bearing 25, the cooling gap D2 between the front radial bearing 26 and the rotor 21, the cooling gap D3 between the front bearing housing 27 and the rotor 21, the first backflow hole 121, the backflow flow path 11, and the inlet 302 of the first impeller 30 in this order.
It will be appreciated that the first cooling air path 41 may enter the left side of the cavity through the cooling channel P2 on the axial bearing 25, and enter the return flow channel 11 from the first return hole 121 after completing the heat dissipation of the left side component in the cavity, and the hot air in the return flow channel 11 may exchange heat with the wall surface of the casing 10 to transfer the heat to the outside. In this way, the space through which the cooling flow channel 40 passes along the first direction X can be increased, so that heat dissipation of a component in the cavity far away from the first impeller 30 side is ensured, the possibility that heat is concentrated at one place is reduced, and the uniformity of heat dissipation is improved.
Specifically, the axial bearing 25 includes a rear axial bearing 251, a thrust disc 252 and a front axial bearing 253, which are sequentially sleeved on the rotor 21 along the first direction X, the front axial bearing 253 being located on a side of the rear axial bearing 251 facing away from the first impeller 30, the thrust disc 252 being fixedly connected to the rotor 21 and being adapted to prevent axial play of the rotor 21. Wherein the radial length of the forward axial bearing 253 and the radial length of the aft axial bearing 251 are equal and greater than the radial length of the thrust disc 252; radially, through holes extending in the first direction are formed in the protruding portion of the front axial bearing 253 protruding from the thrust disc 252 and the protruding portion of the rear axial bearing 251 protruding from the thrust disc 252, and the through holes in the front axial bearing 253 and the through holes in the rear axial bearing 251 are opposite to each other to form a cooling passage P2.
Wherein, in order to improve the heat dissipation efficiency, the cooling channels P1 on the rear bearing housing 24 are plural and uniformly distributed along the circumferential direction of the rear bearing housing 24; the cooling passages P2 in the axial bearing 25 are also plural and uniformly distributed in the circumferential direction of the axial bearing 25.
Referring to fig. 2 and 3, in an embodiment of the present application, the backflow hole 12 further includes a second backflow hole 122 spaced from the first backflow hole 121, and the second backflow hole 122 is opposite to the stator 22; the cooling flow path 40 further includes a second cooling air path 42, and the second cooling air path 42 passes through the outlet 301 of the first impeller 30, the cooling channel P1 on the rear bearing housing 24, the cooling gap D1 between the stator 22 and the rotor 21, the flow guiding hole 231, the second flow guiding hole 122, the flow guiding flow path 11, and the inlet 302 of the first impeller 30 in order. Therefore, heat dissipation at the stator 22 with serious heat generation can be enhanced, air in the cooling flow channel 40 is reasonably split, the air cooling heat exchange efficiency is improved, and the wind mill of the rotor 21 is effectively reduced.
Wherein the first impeller 30 drives the flow of cool air within the casing 10. Specifically, after being discharged from the outlet 301 of the first impeller 30, the cold air enters the right space of the stator 22 in the cavity through the cooling passage P1 on the rear bearing housing 24, and then enters the left space of the stator 22 through the cooling gap D1 between the stator 22 and the rotor 21. Then, the air flow direction is divided into two, and the second cooling air path 42 passes through the diversion holes 231, and enters the backflow passage 11 through the second backflow hole 122 after completing heat dissipation to the stator 22; the first cooling air path 41 passes through the cooling channel P2 on the axial bearing 25 to enter the left side of the cavity, passes through the cooling gap D2 between the front radial bearing 26 and the rotor 21 and the cooling gap D3 between the front bearing housing 27 and the rotor 21 in order to complete the heat dissipation of the left side components, then enters the return flow channel 11 from the first return hole 121, and the hot air in the return flow channel 11 exchanges heat with the wall surface of the casing 10 to transfer the heat to the outside. Finally, the cold air after heat exchange is returned to the inlet 302 of the first impeller 30, and internal circulation heat dissipation is completed.
It will be appreciated that when the second cooling air path 42 flows through the guide hole 231, the flow direction thereof is from left to right, which is opposite to the direction in which the cool air enters the left space of the stator 22 from right to left through the cooling gap D1 between the stator 22 and the rotor 21, so as to further increase the heat dissipation to the stator 22.
Referring to fig. 1, in an embodiment of the present application, the air-cooled heat dissipation structure 100 further includes a plurality of fins 50, and the plurality of fins 50 are spaced on the outer peripheral side of the housing 10 and extend along the first direction X. Thus, the heat dissipation area of the housing 10 can be increased, and the heat dissipation performance of the air-cooled heat dissipation structure 100 can be improved.
In the first direction X, the length of the fins 50 is consistent with the length of the housing 10 to increase the surface area of the fins 50, so that the fins are more fully contacted with air, and the heat dissipation capability of the air-cooled heat dissipation structure 100 is improved. In addition, each fin 50 and the housing 10 may be of an integral structure, which is convenient for processing and preparation.
In addition, the plurality of fins 50 are uniformly spaced along the circumferential direction of the housing 10 to make the heat dissipation of the housing 10 more uniform and reduce the possibility of heat concentration.
Further, referring to fig. 1, 3 and 7, in the present embodiment, a flange 13 perpendicular to the fins 50 is annularly disposed on the side wall of the housing 10, the flange 13 is provided with a drainage outlet 14, and the drainage outlet 14 is located between adjacent fins 50 along the circumferential direction of the housing 10; the air-cooled heat dissipation structure 100 further includes a volute 60 and a second impeller 71, where the volute 60 is disposed at one end of the housing 10 and is attached to the flange 13, an inner cavity of the volute 60 is communicated with the drainage outlet 14, and the second impeller 71 is disposed in the volute 60 and is used for driving gas in the inner cavity to be guided between the adjacent fins 50 through the drainage outlet 14. In this way, a portion of the compressed air in the volute 60 may be directed to the fins 50 via the drain outlet 14, thereby carrying away heat from the side walls of the housing 10 and the fins 50, and achieving heat dissipation.
It can be appreciated that, on one hand, the air-cooled heat dissipation structure 100 exchanges heat between the heat in the housing 10 and the wall surface of the housing 10 through the internal circulation flow channel to dissipate heat; on the other hand, the air-cooled heat dissipation structure 100 can also improve the heat dissipation efficiency by leading out the cold air in the spiral case 60 to the fins 50 for external heat dissipation, without external equipment, and save the volume occupied by the air-cooled heat dissipation structure 100.
Wherein the second impeller 71 is fixed to the left end of the rotor 21 by a locking pull rod 72 and a nut 73 to achieve energy-saving driving. Correspondingly, the first impeller 30 is fixed at the right end of the rotor 21 by a locking pull rod 72 and a nut 73 to achieve energy-saving driving.
It will be appreciated that in other embodiments of the present application, the second impeller 71 may be arranged in other ways, so long as heat dissipation from the fins 50 is ensured. Alternatively, the fin 50 may be cooled by adding a semiconductor cooling fin, which is not limited herein.
Referring to fig. 1 to 3 and fig. 7, in an embodiment of the present application, a housing 10 includes a rear casing 15 and a main casing 16 connected to each other, a rear casing backflow channel 151 is disposed on a casing wall of the rear casing 15, a first impeller 30 is accommodated in the rear casing 15, and an inlet 302 of the first impeller 30 is communicated with the rear casing backflow channel 151; the main casing 16 includes a plurality of sub-casings sequentially connected along the first direction X, and sub-return flow channels are provided on the casing wall of each sub-casing, adjacent sub-return flow channels are connected in a sealing manner, and the sub-return flow channels are communicated with the back-stage casing return flow channel 151. Thus, the housing 10 has a multi-stage structure, which facilitates the processing of the housing 10 and the return flow channel 11.
Wherein, the rear casing 15 and the main casing 16 can be fixedly connected with each other by bolts. In addition, the rear-stage casing return flow channel 151 is arc-shaped, so that resistance to air flow can be reduced. It can be appreciated that a plurality of rear casing return flow channels 151 are provided on the casing wall of the rear casing 15 to improve the internal circulation efficiency.
Specifically, the main casing 16 includes three sub-casings sequentially connected along the first direction X, which are a first sub-casing 161, a second sub-casing and a third sub-casing 162, respectively, and the first sub-casing 161 is adjacent to the rear casing 15; the second sub-housing is the rear bearing housing 24 and is used to fixedly mount the rear radial bearing 28; the stator 22, the aluminum guide sleeve 23, the rear axial bearing 251, the thrust disk 252, the front axial bearing 253, the front radial bearing 26 and the front bearing housing 27 are all installed in the third sub-housing 162, and the front bearing housing 27 is sleeved on the front radial bearing 26.
In addition, the first sub-housing 161 has a first sub-return flow path 111 on its wall, a second sub-housing 112 on its wall, and a third sub-return flow path 113 on its wall, and the first sub-return flow path 111 is smoothly transited in an L-shape and includes a portion extending in the first direction X and another portion extending in the radial direction of the housing 10.
Wherein, the first reflow hole 121 and the second reflow hole 122 are both disposed on the inner sidewall of the third sub-casing 162, and then the first cooling air path 41 sequentially passes through the outlet 301 of the first impeller 30, the cooling channel P1 on the rear bearing housing 24, the cooling gap D1 between the stator 22 and the rotor 21, the cooling channel P2 on the axial bearing 25, the cooling gap D2 between the front radial bearing 26 and the rotor 21, the cooling gap D3 between the front bearing housing 27 and the rotor 21, the first reflow hole 121, the third sub-reflow channel 113, the second sub-reflow channel 112, the first sub-reflow channel 111, the rear casing reflow channel 151, and the inlet 302 of the first impeller 30; the second cooling air path 42 passes through the outlet 301 of the first impeller 30, the cooling passage P1 on the rear bearing housing 24, the cooling gap D1 between the stator 22 and the rotor 21, the guide hole 231, the second return hole 122, the third sub-return flow passage 113, the second sub-return flow passage 112, the first sub-return flow passage 111, the rear casing return flow passage 151, and the inlet 302 of the first impeller 30 in this order.
It will be appreciated that the hot air in the third sub-return flow path 113 exchanges heat with the wall of the housing 10, transfers heat to the external fins 50, and then merges into the second sub-return flow path 112, and continues to exchange heat with the wall of the housing 10 in the second sub-return flow path 112. Finally, the cold air after heat exchange flows back from the first sub-backflow flow channel 111 and the rear casing backflow flow channel 151 to the inlet 302 of the first impeller 30, and internal circulation heat dissipation is completed.
Referring to fig. 7 and 8, in one embodiment of the present application, one of two adjacent sub-housings is provided with a flow passage interface 17 for communicating with the return flow passage of the sub-housing, and the other is provided with a sealing joint 18, and the flow passage interface 17 is abutted with the sealing joint 18 to form a conical labyrinth seal structure.
Specifically, the connection part of the adjacent sub-backflow channels is provided with a conical channel connector 17 and a conical sealing joint 18. The runner joint 17 is a 15-degree conical hole, the sealing joint 18 is a 15-degree conical pipe, and an annular groove is formed in the side wall of the sealing joint 18 to form a labyrinth sealing structure. Therefore, the flow passage interface 17 of the taper hole is convenient for plugging the sub-backflow flow passages during assembly of the adjacent sub-shells, and the labyrinth sealing structure can ensure the tightness between the sub-backflow flow passages of the adjacent sub-shells, so that the air tightness of the whole backflow flow passage 11 is ensured.
It will be appreciated that in other embodiments of the application, the tapered sealing joint 18 may be replaced by an externally added tapered rubber joint, notably the externally added tapered rubber joint configuration adds to the complexity of the assembly.
In the above air-cooled heat dissipation structure 100, when the rotor 21 is driven to rotate, the first impeller 30 and the rotor 21 are synchronously started and stopped, and power can be provided for air internal circulation without additional driving circuits and control devices. In addition, the reflux flow channel 11 and the cooling flow channel 40 are communicated through the reflux hole 12 and the first impeller 30 to form an internal circulation flow channel which is not contacted with the outside, so that the dryness and the cleanliness of the inside of the motor are ensured; meanwhile, the backflow runner 11 arranged in the shell 10 can also realize good heat dissipation, so that the technical problem that the dryness and cleanliness of the inside of the motor cannot be guaranteed when the existing magnetic levitation motor dissipates heat in an air cooling mode is solved. In addition, the casing 10 with a multi-stage structure can facilitate the processing of the casing 10 and the backflow passage 11.
Implementations of the second aspect of the present application provide a magnetic levitation motor including an air-cooled heat dissipation structure 100 as in any of the embodiments of the first aspect.
The magnetic levitation motor realizes good heat dissipation through the air-cooled heat dissipation structure 100, can provide power for the air internal circulation of the air-cooled heat dissipation structure 100 without additional driving circuits and control devices, and saves energy. In addition, the internal circulation runner is not contacted with the outside, so that the dryness and the cleanliness of the inside of the motor can be ensured.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. The air cooling heat dissipation structure comprises a shell and a rotor, wherein a cavity is formed in the shell, and the rotor is arranged in the cavity and extends along a first direction;
a backflow flow passage is arranged in the shell, backflow holes communicated with the cavity are formed in the inner side wall of the shell, and a cooling flow passage is formed in the peripheral side of the rotor;
the inlet of the first impeller is communicated with the backflow flow channel, the outlet of the first impeller is communicated with the cooling flow channel, and the backflow flow channel and the cooling flow channel are both communicated with the backflow hole.
2. The air-cooled heat dissipation structure according to claim 1, further comprising a stator sleeved on the rotor and a diversion aluminum sleeve sleeved on the stator, wherein a plurality of diversion holes extending along the first direction are formed in the diversion aluminum sleeve, one end of each diversion hole is communicated with the cooling flow passage, and the other end of each diversion hole is communicated with the backflow flow passage.
3. An air-cooled heat dissipating structure according to claim 2, wherein the plurality of flow guiding holes are uniformly distributed along the circumference of the flow guiding aluminum sleeve.
4. The air-cooled heat dissipation structure according to claim 2, wherein the air-cooled heat dissipation structure comprises a rear bearing housing, the stator, an axial bearing, a front radial bearing and a front bearing housing which are sleeved on the rotor in sequence along the first direction, the rear bearing housing, the stator, the axial bearing, the front radial bearing and the front bearing housing are all fixedly connected to the shell, cooling channels extending along the first direction are formed on the rear bearing housing and the axial bearing, a cooling gap is formed between the stator, the front radial bearing and the front bearing housing and the rotor, and the backflow hole comprises a first backflow hole, and the first backflow hole is positioned on one side of the shell away from the first impeller;
the cooling flow passage comprises a first cooling air passage, and the first cooling air passage sequentially passes through an outlet of the first impeller, a cooling channel on the rear bearing housing, a cooling gap between the stator and the rotor, a cooling channel on the axial bearing, a cooling gap between the front radial bearing and the rotor, a cooling gap between the front bearing housing and the rotor, a first backflow hole, a backflow flow passage and an inlet of the first impeller.
5. An air-cooled heat dissipating structure according to claim 4, wherein the return holes further comprise a second return hole disposed in spaced relation to the first return hole, the second return hole being disposed opposite the stator;
the cooling flow passage further comprises a second cooling air passage, and the second cooling air passage sequentially passes through the outlet of the first impeller, the cooling channel on the rear bearing shell, the cooling gap between the stator and the rotor, the diversion hole, the second backflow hole, the backflow flow passage and the inlet of the first impeller.
6. An air-cooled heat dissipating structure according to claim 2, further comprising a plurality of fins spaced on an outer peripheral side of the housing and extending in the first direction.
7. The air-cooled heat dissipation structure according to claim 6, wherein a flange perpendicular to the fins is annularly arranged on the side wall of the housing, a drainage outlet is formed in the flange, and the drainage outlet is located between adjacent fins along the circumferential direction of the housing;
the air-cooled heat dissipation structure further comprises a volute and a second impeller, the volute is arranged at one end of the shell and is attached to the flange, an inner cavity of the volute is communicated with the drainage outlet, and the second impeller is located in the volute and is used for driving gas in the inner cavity to be guided between the adjacent fins through the drainage outlet.
8. An air-cooled heat dissipating structure according to any one of claims 1 to 7, wherein the housing includes a rear casing and a main casing connected to each other, a rear casing backflow passage is provided on a casing wall of the rear casing, the first impeller is accommodated in the rear casing, and an inlet of the first impeller is communicated with the rear casing backflow passage;
the main machine shell comprises a plurality of sub machine shells which are sequentially connected along the first direction, sub backflow channels are arranged on the shell walls of the sub machine shells, adjacent sub backflow channels are in sealing connection, and the sub backflow channels are communicated with the backflow channels of the rear machine shell.
9. An air-cooled heat dissipating structure according to claim 8, wherein one of the two adjacent sub-housings is provided with a flow passage interface for communicating with the sub-return flow passage, and the other is provided with a sealing joint, and the flow passage interface is abutted with the sealing joint to form a conical labyrinth seal structure.
10. A magnetic levitation motor comprising an air-cooled heat dissipation structure as defined in any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310556018.9A CN116742879B (en) | 2023-05-16 | Air-cooled heat radiation structure and magnetic levitation motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310556018.9A CN116742879B (en) | 2023-05-16 | Air-cooled heat radiation structure and magnetic levitation motor |
Publications (2)
| Publication Number | Publication Date |
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| CN116742879A true CN116742879A (en) | 2023-09-12 |
| CN116742879B CN116742879B (en) | 2024-06-28 |
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