WO2023279643A1 - Rotor, structure de refroidissement de rotor, moteur et compresseur - Google Patents

Rotor, structure de refroidissement de rotor, moteur et compresseur Download PDF

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Publication number
WO2023279643A1
WO2023279643A1 PCT/CN2021/135258 CN2021135258W WO2023279643A1 WO 2023279643 A1 WO2023279643 A1 WO 2023279643A1 CN 2021135258 W CN2021135258 W CN 2021135258W WO 2023279643 A1 WO2023279643 A1 WO 2023279643A1
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WO
WIPO (PCT)
Prior art keywords
rotor
hole
cooling structure
thrust plate
structure according
Prior art date
Application number
PCT/CN2021/135258
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English (en)
Chinese (zh)
Inventor
韩聪
常云雪
俞国新
李靖
朱万朋
Original Assignee
青岛海尔智能技术研发有限公司
海尔智家股份有限公司
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Application filed by 青岛海尔智能技术研发有限公司, 海尔智家股份有限公司 filed Critical 青岛海尔智能技术研发有限公司
Publication of WO2023279643A1 publication Critical patent/WO2023279643A1/fr

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    • 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
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the present application relates to the technical field of compressors, for example, to a rotor, a rotor cooling structure, a motor and a compressor.
  • the compressor includes a motor and a pneumatic part.
  • the motor transmits high-speed rotational motion to the actuator of the pneumatic part, so that the pneumatic part converts the inhaled low-pressure gas into high-pressure gas for output.
  • the motor used in the magnetic levitation compressor is a magnetic levitation motor. Since the stator and mover of the magnetic levitation motor operate in a non-contact and oil-free manner, the magnetic levitation compressor has the advantages of high efficiency and energy saving, and further speed increase is the development trend of the magnetic levitation motor.
  • the rotor rub against the gas in the cavity during high-speed rotation to generate a lot of heat.
  • the following Two ways 1. Strengthen the gas fluid velocity in the gap between the rotor and the stator. However, the gap between the stator and the rotor is very small, even if the gas flow rate is increased, it is difficult to meet the high heat dissipation requirements. 2. Spray the liquid refrigerant (a substance with a very low boiling point, which is easy to absorb heat and become a gas, and easy to release heat and become a liquid) into the gap between the stator and the rotor. In this way, the refrigerant will be heated and expanded, evaporated and boiled in the narrow gap, and these changes will affect the stability of the motor operation.
  • the liquid refrigerant a substance with a very low boiling point, which is easy to absorb heat and become a gas, and easy to release heat and become a liquid
  • the present application proposes a rotor and a rotor cooling structure, which have a good heat dissipation effect and can ensure the stability of the rotor during high-speed operation.
  • the present application also proposes a motor, by providing the above-mentioned rotor cooling structure, good heat dissipation effect can be ensured even during high-speed operation, and the rotation is stable.
  • the present application also proposes a compressor, which has a good heat dissipation effect and stable operation by arranging the above-mentioned motor.
  • An embodiment provides a rotor cooling structure, including: a housing, a refrigerant is disposed at the bottom of the housing; and a rotor, the lower end of the rotor is disposed in the refrigerant, and the rotor includes a first through hole and a The second via hole, the first via hole is provided in the rotor along the axial direction of the rotor and passes through the lower end surface of the rotor, the second via hole is provided in the rotor along the radial direction of the rotor The upper part of the rotor passes through the peripheral surface of the rotor, and the second through hole communicates with the first through hole.
  • An embodiment provides a motor, including a stator and the rotor cooling structure, the rotor is rotatably disposed in the housing, the stator is sleeved outside the rotor and located under the second through hole .
  • An embodiment provides a compressor, including the motor described above.
  • An embodiment provides a rotor, including: a first via hole and a second via hole, the first via hole is provided in the rotor along the axial direction of the rotor and passes through the lower end surface of the rotor, so The second through hole is provided on the upper part of the rotor along the radial direction of the rotor and penetrates the peripheral surface of the rotor, and the second through hole communicates with the first through hole.
  • Fig. 1 is a longitudinal sectional view of a motor provided in Embodiment 1 of the present application;
  • Fig. 2 is a transverse sectional view of the thrust plate provided in Embodiment 1 of the present application;
  • Fig. 3 is a longitudinal sectional view of the thrust plate and the rotor provided in Embodiment 2 of the present application;
  • FIG. 4 is a top view of FIG. 3 .
  • 3-rotor 31-rotating shaft; 311-first through hole; 312-upper division; 313-lower division; 32-thrust plate; 321-second through hole; 3211-first hole section; Two-hole section; 322-upper half plate; 323-lower half plate;
  • connection should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components.
  • connection can be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components.
  • a first feature being “on” or “under” a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • "Below”, “under” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is less horizontally than the second feature.
  • This embodiment provides a rotor cooling structure, a motor and a compressor, wherein the compressor includes a motor and an aerodynamic part, the aerodynamic part includes an impeller, a volute, a supercharger and guide vanes, and the motor can drive the impeller to rotate at a high speed so that the driven The low-pressure gas sucked into the volute is compressed into high-pressure gas for output.
  • the motor includes a stator 2, a rotor 3 and a rotor cooling structure, and the rotor cooling structure is especially suitable for a non-contact and oil-free magnetic levitation motor between the stator 2 and the rotor 3.
  • the rotor cooling structure includes a housing 1, a first through hole 311 and a second through hole 321 are provided on the rotor 3, a refrigerant is provided at the bottom of the housing 1, and the rotor 3 is rotatable and the lower end is placed in the refrigerant, the first through hole 311 is vertically arranged in the rotor 3 along the axial direction of the rotor 3 and penetrates the lower end surface of the rotor 3, and the second through hole 321 is along the rotor 3
  • the radial direction of 3 is set on the upper part of rotor 3 and penetrates the peripheral surface of rotor 3, the second through hole 321 communicates with the first through hole 311, the stator 2 is sleeved outside the rotor 3 and fixed in the housing 1, and the stator 2 is located below the second via hole 321.
  • the second via hole 321 extends in the radial direction of the rotor 3, and the radial extension mode of the second via hole 321 may extend from the center position of the rotor 3 to the circumference of the rotor 3 along any trajectory. noodle.
  • the rotor 3 includes a rotating shaft 31 and a thrust disc 32.
  • the thrust disc 32 is connected to the upper part of the rotating shaft 31 to be located on the upper side of the stator 2.
  • the diameter of the thrust disc 32 is larger than the diameter of the rotating shaft 31.
  • the gas in the second through hole 321 arranged in the radial direction generates a negative pressure under the action of centrifugal force, so that the refrigerant at the bottom of the housing 1 can be sucked in from the first through hole 311 , and thrown out from the peripheral surface of the thrust plate 32 through the second through hole 321, the flow process of the refrigerant in the first through hole 311 and the second through hole 321 can fully cool the rotor 3 to meet the higher cooling requirements.
  • the refrigerant does not pass through the narrow gap between the stator 2 and the rotor 3, but cools down inside the rotor 3, thereby ensuring the stability of the rotor 3 during high-speed rotation.
  • the motor of this embodiment can not only meet the higher cooling requirements during high-speed operation, but also ensure the stability of the operation process by providing the above-mentioned rotor cooling structure, thereby meeting the speed-up requirements of the motor.
  • the compressor of this embodiment has a good cooling effect and stable operation by providing the above-mentioned motor.
  • the motor includes two axial bearings 5 and two radial bearings 4, wherein the two axial bearings 5 are respectively sleeved on the rotating shaft 31, and are respectively located on the upper and lower sides of the stator 2, and the two radial bearings 4 are sleeved on the rotor 3 and located on the upper and lower sides of the thrust plate 32, the radial bearing 4 and the axial bearing 5 can respectively provide radial support and axial support for the rotor 3, so that the rotor 3 can rotate stably in the housing 1.
  • the diameter of the thrust plate 32 is larger than that of the rotating shaft 31. On the one hand, it plays the role of cooperating with the axial bearing 5.
  • the diameter of the thrust plate 32 is not smaller than that of the stator 2 , so as to further ensure that the refrigerant discharged from the second through hole 321 will not flow between the stator 2 and the rotor 3 .
  • the first through hole 311 is set in the rotating shaft 31 and extends to the thrust plate 32
  • the second through hole 321 is set in the thrust plate 32
  • the thrust plate 32 and the rotating shaft 31 are integrally formed, so that the first The first via hole 311 and the second via hole 321 can be directly connected, and there is no gap at the connection position, thereby ensuring that the liquid passage composed of the first via hole 311 and the second via hole 321 has good sealing performance.
  • the axis of the first through hole 311 is in line with the rotation axis of the rotor 3, so when the refrigerant passes through the first through hole 311, it can be ensured that the center of gravity of the rotor 3 coincides with the rotation axis , thereby ensuring the rotation balance of the rotor 3 and improving the stability of the motor operation.
  • At least two second through holes 321 are provided on the thrust plate 32, and at least two second through holes 321 are evenly distributed along the circumferential direction of the thrust plate 32, so that During the flow of the refrigerant in the thrust plate 32 , the center of gravity of the entire thrust plate 32 remains coincident with the rotation axis of the rotor 3 , thereby further ensuring the stability of the motor rotation process.
  • the thrust plate 32 is provided with two second through holes 321 .
  • the thrust plate 32 may also be provided with three or four through holes, which is not limited here.
  • the extension path of the second via hole 321 is a zigzag line.
  • the zigzag line path can buffer and slow down the process of the refrigerant discharging from the second via hole 321 , thereby reducing the flow rate of the refrigerant.
  • the linear velocity when discharged from the second through hole 321 can reduce the reverse impact force of the refrigerant thrown out by the thrust plate 32 on the thrust plate 32 and the impact force of other structures such as the housing 1, and further improve the motor operation process. stability.
  • the second via hole 321 includes a first hole segment 3211 and a second hole segment 3212 intersecting.
  • the first hole segment 3211 and the second hole segment 3212 are linear hole segments.
  • a hole segment 3211 overlaps with a radius portion of the thrust plate 32, and the two ends communicate with the first through hole 311 and the second hole segment 3212 respectively, and the second hole segment 3212 extends to the peripheral surface of the thrust plate 32.
  • the flow path of the refrigerant is to flow out from the first through hole 311 and then enter the first hole section 3211 , and then exit the rotor 3 through the second hole section 3212 .
  • the first hole when processing the second through hole 321, the first hole is first drilled along the radial direction on the peripheral surface of the thrust plate 32, and the first hole passes through the center of the thrust plate 32, so as to be able to communicate with the thrust plate 32.
  • the first through hole 311 communicates, and then, drill the second hole segment 3212 along the non-radius direction at other positions on the peripheral surface of the thrust plate 32, so that the second hole segment 3212 intersects and communicates with the first hole.
  • screw Or the pin blocks the first hole near the end of the thrust plate 32 peripheral surface, and now the unblocked first hole (i.e.
  • the first hole section 3211) and the second hole section 3212 together form a broken line
  • the second via hole 321 in this solution, the processing difficulty of the second via hole 321 is low, and the forming is convenient. It should be noted that in the actual implementation process, the suction force of the entire liquid passage and the linear velocity of the refrigerant discharged from the second through hole 321 can be adjusted and optimized by changing the inclination angle of the second hole section 3212 to meet different requirements. Due to application requirements, the specific angle of the second hole section 3212 is not limited here.
  • the housing 1 includes a body portion 11 and an accommodating groove portion 12, the accommodating groove portion 12 is recessed at the lower end of the body portion 11, the stator 2, the radial bearing 4 and the axial bearing 5 They are respectively arranged in the body part 11, the lower end of the rotating shaft 31 extends into the receiving groove part 12, and the refrigerant is located in the receiving groove part 12, so as to ensure that the lower end of the first via hole 311 can always be submerged by the refrigerant.
  • the cross-sectional area of the receiving groove portion 12 is smaller than that of the main body portion 11 , which is further beneficial to ensure that the lower end of the first via hole 311 is immersed in the refrigerant.
  • the housing 1 may not be segmented but a cylindrical body with a constant cross-sectional area, which can be set according to actual needs.
  • the casing 1 is provided with a liquid inlet 111 for introducing refrigerant into the casing 1 , and the liquid inlet 111 is arranged on the main body 11 and opposite to the stator 2 , Then the liquid refrigerant will contact the stator 2 after entering the casing 1 , cool the stator 2 first, and then fall to the bottom of the casing 1 (ie, the receiving groove 12 ) to be sucked by the first through hole 311 .
  • the liquid inlet 111 may also be provided at the receiving groove 12 , which is not specifically limited here.
  • the upper end of the main body 11 is provided with an exhaust port 113 , and after the refrigerant is discharged from the second through hole 321 , a part of the refrigerant that has not been vaporized gathers into the accommodation groove 12 along the inner wall of the housing 1 Inside, there is still a part that is gasified due to temperature rise, and the gasified refrigerant can be discharged from the exhaust port 113, so as to ensure the stability of the air pressure in the casing 1, and then ensure the normal operation of the motor.
  • a collection structure is provided outside the casing 1, which can collect the vaporized refrigerant discharged from the exhaust port 113, cool down and liquefy the collected gaseous refrigerant, and then pass it through the liquid inlet 111. into the housing 1, so as to realize the recycling of the refrigerant.
  • the specific form of the collection structure can refer to related technologies, and will not be repeated here.
  • the body part 11 of the casing 1 is provided with a liquid overflow port 112, and the height of the liquid overflow port 112 is lower than the lowest point of the stator 2.
  • the liquid level of the liquid refrigerant in the casing 1 rises, the liquid state
  • the refrigerant will be discharged from the overflow port 112 to prevent the refrigerant from entering the gap between the stator 2 and the rotor 3 .
  • the refrigerant discharged from the overflow port 112 may also be connected to a collection structure for collection, so that the refrigerant can be recycled.
  • This embodiment also provides a liquid cooling structure, a motor, and a compressor.
  • the motor includes a stator 2, a rotor 3, a rotor cooling structure, a radial bearing 4, and an axial bearing 5.
  • the inventive concept of this embodiment and the housing 1 The arrangement structures of the stator 2, the radial bearing 4 and the axial bearing 5 are all the same as those in the first embodiment, and will not be repeated here. The difference lies in the arrangement of the rotor 3 and the second through hole 321, specifically:
  • the extension path of the second through hole 321 is an arc, and the arrangement of the arc makes the flow of the refrigerant in the second through hole 321 smoother, and can further reduce the refrigerant discharge thrust
  • the linear velocity of the disk 32 reduces the reverse impact force of the refrigerant on the thrust disk 32 and the impact force on other structures such as the housing 1, so that the running process of the motor is more stable.
  • the second via hole 321 is a semicircular hole.
  • the radian of the second via hole 321 is not specifically limited, and can be appropriately selected as required. In one embodiment, as shown in FIG.
  • the tangential direction of the end of the second through hole 321 close to the peripheral surface of the thrust plate 32 is in the A direction (that is, the discharge direction of the refrigerant).
  • the second through hole 321 The direction of the linear velocity at the outlet is the B direction, the angle between the A direction and the B direction is ⁇ , and ⁇ is an obtuse angle, so that the linear velocity of the refrigerant discharged from the second via hole 321 is further reduced.
  • suction force of the entire liquid passage and the linear velocity of the refrigerant discharged from the second through hole 321 can be adjusted and optimized by changing the tangential direction at the outlet of the second through hole 321, which can be adjusted according to actual needs. Do limited.
  • the arc-shaped second via hole 321 in order to realize the arc-shaped second via hole 321, as shown in FIG. 32 includes an upper half disc 322 and a lower half disc 323, wherein the upper subdivision 312 of the rotating shaft 31 is integrally formed with the upper half disc 322 of the thrust disc 32, and the lower subdivision 313 of the rotating shaft 31 and the lower half disc of the thrust disc 32 323 is integrally formed, and the lower surface of the upper half plate 322 offers a plurality of semicircular half grooves, and the upper surface of the lower half plate 323 also offers a corresponding number of semicircular half grooves, when the upper half plate 322 and the lower half plate After the discs 323 are buckled and fixedly connected, a complete rotor 3 is formed.
  • the half slots on the upper half disc 322 and the half slots on the lower half disc 323 are buckled correspondingly to form a plurality of second through holes 321 .
  • the upper half plate 322 and the lower half plate 323 can be fixedly connected or welded by fasteners.
  • the upper half plate 322 and the lower half plate 323 The specific connection method is not limited.
  • the rotor 3 includes a first through hole 311 and a second through hole 321, the first through hole 311 is along the axial direction It is arranged in the rotor 3 and penetrates the lower end surface of the rotor 3, and the second via hole 321 is arranged on the upper part of the rotor 3 along the radial direction of the rotor 3 and penetrates the peripheral surface of the rotor 3.
  • the second via hole 321 communicates with the first via hole 311 .
  • the rotor 3 includes a rotating shaft 31 and a thrust plate 32, the thrust plate 32 is arranged on the upper part of the rotating shaft 31, and the diameter of the thrust plate 32 is larger than the diameter of the rotating shaft 31, the first pass
  • the hole 311 is disposed in the rotating shaft 31 and extends to the thrust plate 32
  • the second through hole 321 is disposed in the thrust plate 32 .
  • the rotor 3 is provided with at least two second through holes 321 , and the at least two second through holes 321 are evenly distributed along the circumferential direction of the rotor 3 .
  • the extension path of the second via hole 321 is an arc; or the extension path of the second via hole 321 is a broken line.
  • the axis of the first through hole 311 is collinear with the rotation axis of the rotor 3 .

Abstract

L'invention concerne un rotor, une structure de refroidissement de rotor, un moteur et un compresseur. Le moteur comprend un stator ; un rotor comprenant un premier trou traversant et un deuxième trou traversant, le deuxième trou traversant étant en communication avec le premier trou traversant, le premier trou traversant étant ménagé dans le rotor le long de la direction axiale du rotor et s'étendant à travers la face d'extrémité inférieure du rotor, et le deuxième trou traversant étant ménagé dans la partie supérieure du rotor le long de la direction radiale du rotor et s'étendant à travers la surface périphérique du rotor ; et une structure de refroidissement de rotor comprenant un boîtier, un fluide frigorigène étant disposé au fond du boîtier, et l'extrémité inférieure du rotor étant située dans le fluide frigorigène, le rotor étant supporté rotatif dans le boîtier, et le stator étant emmanché à l'extérieur du rotor et situé en dessous du deuxième trou traversant.
PCT/CN2021/135258 2021-07-08 2021-12-03 Rotor, structure de refroidissement de rotor, moteur et compresseur WO2023279643A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110771858.8 2021-07-08
CN202110771858.8A CN115603491A (zh) 2021-07-08 2021-07-08 一种立式转子冷却结构、电机及压缩机

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Publication Number Publication Date
WO2023279643A1 true WO2023279643A1 (fr) 2023-01-12

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0660492A1 (fr) * 1993-12-23 1995-06-28 ABB VERKEHRSTECHNIK Gesellschaft m.b.h. Système de refroidissement d'un moteur
CN1623039A (zh) * 2002-01-25 2005-06-01 森德奈公司 通过液体冷却的电驱动转子动力系统
CN104158349A (zh) * 2014-07-29 2014-11-19 江苏大学 一种湿式电机多功能推力盘及湿式电机
CN109256902A (zh) * 2018-10-29 2019-01-22 西安交通大学 一种定转子一体化循环冷却的高速永磁电机及其冷却方法
CN110198092A (zh) * 2019-06-19 2019-09-03 清华大学 电机转子中空轴内导热油冷却装置及飞轮储能电机
CN110875660A (zh) * 2018-08-30 2020-03-10 通用电气公司 具有转子冷却剂和润滑分配系统的电机，以及冷却和润滑电机的系统和方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0660492A1 (fr) * 1993-12-23 1995-06-28 ABB VERKEHRSTECHNIK Gesellschaft m.b.h. Système de refroidissement d'un moteur
CN1623039A (zh) * 2002-01-25 2005-06-01 森德奈公司 通过液体冷却的电驱动转子动力系统
CN104158349A (zh) * 2014-07-29 2014-11-19 江苏大学 一种湿式电机多功能推力盘及湿式电机
CN110875660A (zh) * 2018-08-30 2020-03-10 通用电气公司 具有转子冷却剂和润滑分配系统的电机，以及冷却和润滑电机的系统和方法
CN109256902A (zh) * 2018-10-29 2019-01-22 西安交通大学 一种定转子一体化循环冷却的高速永磁电机及其冷却方法
CN110198092A (zh) * 2019-06-19 2019-09-03 清华大学 电机转子中空轴内导热油冷却装置及飞轮储能电机

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