WO2022016950A1

WO2022016950A1 - Electric motor and centrifugal air compressor

Info

Publication number: WO2022016950A1
Application number: PCT/CN2021/091528
Authority: WO
Inventors: 刘华; 张治平; 叶文腾; 陈玉辉
Original assignee: 珠海格力电器股份有限公司
Priority date: 2020-07-24
Filing date: 2021-04-30
Publication date: 2022-01-27
Also published as: CN111864990A

Abstract

Provided are an electric motor and a centrifugal air compressor. The electric motor comprises a housing, a stator and a rotor, wherein the stator is arranged in the housing, the stator is provided with a rotor cavity, the rotor is rotatably arranged in the rotor cavity, and a gap is provided between the rotor and the stator. In the electric motor with a dual cooling effect and the centrifugal air compressor, a cooling circulation pipeline is arranged between the stator and the housing, and the cooling circulation pipeline is spirally arranged, such that the effective cooling of the stator by the cooling circulation pipeline is increased. Moreover, by means of providing an airflow channel, an air-cooling gas is led into the rotor cavity, and an axial flow channel is arranged to have a certain inclination angle, such that 360° annular air blowing cooling is achieved; and the airflow direction of the axial flow channel is the same as the rotation direction of the rotor, such that an airflow can generate a certain driving force for the rotor, thereby reducing working power consumption.

Description

Motor and centrifugal air compressor

Horizontal citations to related applications

The present disclosure is based on Application No. 202010725469.7, filed the application for the China-based 2020 of July 24, and claims priority, the disclosure of which China is hereby incorporated into this disclosure as a whole.

technical field

The present disclosure relates to the technical field of driving equipment, in particular to a motor and a centrifugal air compressor with dual cooling effects.

Background technique

Existing air compressors use water cooling or water cooling and air cooling at the same time. For air compressors using water cooling, the cooling method is only to set cooling pipes on the outer surface of the motor, which can only be cooled to the stator. They are not cooled; the double cooling method is adopted, and the water cooling is also arranged on the outer surface of the motor, and the air cooling enters the motor through the pipeline arranged on the casing for cooling. The cooling effect of the above two cooling methods will make the motor partially cool Uneven, causing local uncooling to form high temperature areas. For compressors with hundreds of thousands of revolutions, the rotor is affected by frequency conversion harmonics, and a lot of heat will be generated during operation, so that the temperature of the rotor magnet steel position is quite high, and the problem of demagnetization occurs when the magnet steel withstand temperature exceeds the temperature.

public content

In order to solve the technical problem of the poor cooling effect of the motor in the prior art, a motor with double cooling effect is provided, which adopts liquid cooling between the stator and the casing, and an air-cooled air flow enters the rotor cavity for cooling to improve the cooling effect. and centrifugal air compressors.

According to an aspect of the present disclosure, there is provided a motor including:

The shell is provided with an air inlet and an air outlet;

a stator, disposed inside the casing, and a rotor cavity is disposed in the stator; and

The rotor is rotatably arranged inside the rotor cavity, and a gap is arranged between the rotor and the stator; the cooling circulation pipeline

cooling circuit;

The gas flow channel includes: an air inlet, a gap and an air outlet connected in sequence.

In some embodiments, the casing is a cylindrical structure, and the cooling circulation pipeline is spirally wound on the casing along the axis of the cylindrical structure.

In some embodiments, the cooling circuit is provided between the housing and the stator.

In some embodiments, the motor further includes a cooling cylinder, the cooling cylinder has a cylindrical structure, the cooling cylinder sleeve is arranged between the stator and the casing, and the cooling circulation pipeline is arranged between the casing and the cooling cylinder.

In some embodiments, the motor further includes two sealing rings, which are respectively provided at two ends of the cooling cylinder.

In some embodiments, the cooling cartridge is an interference fit with the stator.

In some embodiments, the motor further includes a support, the end of the rotor is disposed on the housing through the support, the air flow channel further includes an air flow channel arranged in the support, the first end of the air flow channel and the air inlet Or the air outlet is communicated, and the second end communicates with the gap.

In some embodiments, the support has an end surface facing the rotor and a peripheral side surface perpendicular to the end surface, the first end of the airflow channel is arranged on the peripheral side surface, and the second end is arranged on the end surface.

In some embodiments, the gas flow channel includes a radial flow channel and an axial flow channel that are communicated in sequence, an end of the radial flow channel away from the axial flow channel constitutes the first end, and an end of the axial flow channel away from the radial flow channel The second end is formed, and the axis of the axial flow channel has an included angle with the axis of the rotor.

In some embodiments, the inclination direction of the included angle is the same as the rotation direction of the rotor.

In some embodiments, the included angle ranges from 20° to 70°.

In some embodiments, the gas flow channel further includes an annular flow channel disposed in the support, the annular flow channel is an annular groove surrounding the axis of the rotor, a first opening is provided on the peripheral side of the annular groove, and the annular groove is close to the gap A second opening is arranged on the end face of the hood, the first opening is communicated with the air inlet or the air outlet, and the second opening is communicated with the gap.

In some embodiments, the first opening is arranged corresponding to the air inlet, or the first opening is arranged corresponding to the air outlet.

In some embodiments, the longitudinal section of the annular groove is a trapezoid, the first opening is disposed on the oblique side of the trapezoid, and the second opening is disposed on the upper base or the lower base of the trapezoid.

In some embodiments, the number of airflow channels is multiple, and the number of airflow channels is proportional to the diameter of the motor.

In some embodiments, all the air flow channels are evenly distributed in the support in an annular shape with the axis of the rotor as the centerline.

In some embodiments, two supports are provided, including a left support and a right support, the air flow channel provided in the left support is the first air flow channel, and the air flow channel provided in the right support is a second air flow channel, one end of the first air flow channel is communicated with the air inlet, the other end is communicated with the gap, one end of the second air flow channel is communicated with the air outlet, and the other end is communicated with the gap; or

There are two supports, including a left support and a right support. The air flow channel set in the right support is the first air flow channel, and the air flow channel set in the left support is the second air flow channel. One end of the first air flow channel is communicated with the air inlet, the other end is communicated with the gap, one end of the second air flow channel is communicated with the air outlet, and the other end is communicated with the gap.

A centrifugal air compressor includes the motor of the above embodiment.

Description of drawings

1 is a cross-sectional view of an electric machine of some embodiments of electric machines with dual cooling provided by the present disclosure;

FIG. 2 is a schematic structural diagram of a support and a rotor of some embodiments of a motor with dual cooling effects provided by the present disclosure.

In the picture:

1. Shell; 2. Stator; 3. Rotor; 4. Clearance; 5. Cooling circulation pipeline; 6. Air inlet; 7. Air outlet; 8. Cooling cylinder; 9. Axial flow channel; 9', diameter To the flow channel; 10, the support; 11, the annular flow channel.

detailed description

In order to make the objectives, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure, but not to limit the present disclosure.

Terms such as "first" and "second" appearing in the present disclosure are only for the convenience of description, to distinguish different components with the same name, and do not indicate a sequence or a primary-secondary relationship.

As shown in FIG. 1 and FIG. 2 , in some embodiments, the motor includes a housing 1, a stator 2 and a rotor 3, the stator 2 is arranged inside the housing 1, a rotor cavity is arranged in the stator 2, and the rotor 3 is rotatable. It is arranged inside the rotor cavity, and a gap 4 is arranged between the rotor 3 and the stator 2. A cooling circulation pipeline 5 is arranged on the casing 1, and an air inlet 6 and an air outlet 7 are arranged on the casing 1. The air inlet 6, The gap 4 and the air outlet 7 are connected in sequence to form a gas flow channel. For example, the cooling circulation line 5 may be a liquid circulation line such as a water circulation line, or a gas circulation line.

In this embodiment, a water-cooling system and an air-cooling system are simultaneously set inside the casing 1, and the heat of the casing 1 and the stator 2 is cooled by the water-cooling system, and the gas in the gas flow channel enters the rotor cavity, so as to realize the wire wrapping of the stator 2. cooling, and optimize the effect of axial air supply, fully cool the stator 2 and the rotor 3, the air flow enters the rotor cavity through the air inlet 6, and flows through the rotor 3 and the stator 2 through the gap 4, and finally is discharged from the air outlet 7. The cooling inside the rotor 3 and the stator 2 overcomes the problem of uneven heat dissipation still existing in the prior art by water cooling or the combination of water cooling and air cooling.

The shell 1 is a cylindrical structure, and the cooling circulation line 5 is spirally wound on the inner side wall of the shell 1 along the axis of the cylindrical structure, so as to increase the distance of the cooling circulation line 5 flowing through the inner surface of the shell 1 as much as possible. , thereby increasing the cooling effect of the cooling circuit 5 . For example, the inner side wall of the housing 1 is provided with a spiral groove, and the cooling circulation pipe 5 is arranged in the groove, so as to improve the reliability of the fixing of the cooling circulation pipe 5 and reduce the radial dimension of the motor.

In some embodiments, the cooling circulation line 5 is arranged between the casing 1 and the stator 2, which overcomes the problem that the cooling circulation pipe 5 can only be arranged outside the casing 1 in the prior art, and reduces the cooling circulation as much as possible. The heat transfer path between the pipeline 5 and the stator 2 increases the cooling effect of the cooling circulation pipeline 5 .

In some embodiments, since the motor needs to be waterproofed to prevent the cooling water in the cooling circulation pipeline 5 from leaking or contacting the stator 2 to cause conduction, the motor further includes a cooling cylinder 8, and the cooling cylinder 8 has a cylindrical structure, and The cooling cylinder 8 is set between the outer surface of the stator 2 and the inner surface of the casing 1, and the cooling circulation pipeline 5 is set between the casing 1 and the cooling cylinder 8. The cooling cylinder 8 is used to realize the The stator 2 is sealed and isolated, and the cooling cylinder 8 can also transfer the heat of the stator 2 to the cooling circulation pipeline 5 to achieve cooling.

In some embodiments, the motor further includes a sealing ring, two ends of the cooling cylinder 8 are respectively provided with a sealing ring, and the sealing ring is used to realize the sealing between the cooling cylinder 8 and the casing 1, even if the cooling circulation pipeline 5 There is a problem of leakage, and the cooling water will also be stored between the cooling cylinder 8 and the housing 1 , and will not flow into the stator 2 or the rotor 3 .

The interference fit between the cooling tube 8 and the stator 2 not only ensures the effective fixation of the stator 2 , but also enables the heat of the stator 2 to be reliably transferred to the cooling tube 8 .

In some embodiments, the motor further includes a support 10 , the end of the rotor 3 is disposed on the housing 1 through the support 10 , the support 10 is provided with a bearing, the rotor 3 is supported on the support 10 through the bearing, and the gas flows The channel also includes an air flow channel arranged in the support 10, the first end of the air flow channel is communicated with the air inlet 6 or the air outlet 7, and the second end of the air flow channel is communicated with the gap 4, thereby introducing the cooling air into the rotor cavity. Or to discharge the rotor cavity, for example, a sealing ring is also provided between the support 10 and the casing 1 for sealing.

In some embodiments, the support 10 has an end surface facing the rotor 3 and a peripheral side surface perpendicular to the end surface, the airflow channel is L-shaped, the first end of the airflow channel is arranged on the peripheral side surface, and the second end is arranged on the end surface so that the airflow can be directly blown to the stator 2, the rotor 3 and the gap 4 when entering the rotor cavity, so as to achieve effective cooling of the stator 2 and the rotor 3 by the cooling air, and the airflow enters a support from the air inlet 6 10, and then flows into the rotor cavity for cooling, and is forced to pass through the gap 4 to the other end of the rotor 3 under the squeezing action of the airflow pressure at the air inlet 6, and on the other support 10 Under the collection action of the air flow channel, it flows to the air outlet 7, and the motor is discharged to complete the cooling.

In some embodiments, as shown in FIG. 2 , the air flow channel includes a radial flow channel 9 ′ and an axial flow channel 9 that are communicated in sequence, and an end of the radial flow channel 9 ′ away from the axial flow channel 9 constitutes the first end , the end of the axial flow channel 9 away from the radial flow channel 9' constitutes the second end, and the axis of the axial flow channel 9 and the axis of the rotor 3 have an included angle, and the included angle is an acute angle, that is, the axial flow channel 9 The air outlet direction is not directly towards the rotor cavity, but generates a certain inclination angle while blowing to the rotor cavity, which can ensure that the air flow out of the axial flow channel has a certain circumferential speed and axial speed, which can not only ensure the stator The cooling of the enameled wire on the 2 and the cooling of the surface of the rotor 3 can also ensure that the resistance that the rotor 3 overcomes during operation is reduced, which is beneficial to indirectly reduce the heat of the motor, so that the airflow can rotate in the rotor cavity, and then enter the gap 4. The surface of the rotor 3 is flow-cooled to achieve 360° air supply cooling and increase the cooling effect. The thin line in FIG.

In order to ensure that the cooling air entering the support 10 can better enter the rotor cavity, an O-ring seal needs to be added between the end of the support 10 and the casing 1 to ensure sufficient air volume without leakage.

In some embodiments, the inclination direction of the included angle is the same as the rotation direction of the rotor 3, and the outflow of the airflow channel is used to provide a certain thrust to the rotation of the rotor 3, which can not only ensure the cooling of the enameled wire and the surface of the rotor 3, but also provide a certain thrust to the rotation of the rotor 3. It is ensured that the resistance that the rotor 3 overcomes during operation is reduced, which is beneficial to indirectly reduce the heating of the motor.

In some embodiments, the included angle ranges from 20° to 70°, for example, 45°.

In some embodiments, the gas flow channel further includes an annular flow channel 11, the annular flow channel 11 is an annular groove provided in the support 10 and surrounding the axis of the rotor, and a first opening is provided on the peripheral side of the annular groove, And the end face of the annular groove facing the gap is provided with a second opening, the first opening is communicated with the air inlet 6 or the air outlet 7, the second opening is communicated with the gap 4, and the first opening, the annular groove and the second opening constitute an air flow channel, That is to say, the annular grooves are used to introduce the air intake from all the air inlets 6 into the annular grooves through the first opening for mixing, and then discharged through the second opening, so that the airflow entering the rotor cavity is uniform, and the heat dissipation of the rotor 3 and the stator 2 is increased. uniformity and heat dissipation.

When the air flow channel is used to introduce the gas into the motor, the first opening is arranged corresponding to the air inlet 6, and the air is used to enter the rotor cavity for cooling after passing through the air inlet 6, the first opening, the annular groove and the second opening in sequence. , When the air flow channel is used to lead the gas out of the motor, the first opening is arranged corresponding to the air outlet 7, and the gas is discharged from the motor through the second opening, the annular groove, the first opening and the air outlet 7 in sequence.

The longitudinal section of the annular groove is a trapezoid, and the first opening is arranged on the oblique side of the trapezoid, and the second opening is arranged on the upper bottom of the trapezoid or the lower bottom of the trapezoid, wherein the position of the second opening is according to the direction of the trapezoid toward the rotor cavity. It is determined that when the upper base of the trapezoid is directed to the gap, the second opening is provided at the upper base, and when the lower base of the trapezoid is directed to the gap, the second opening is provided at the lower base.

The number of airflow channels is multiple, and the number of airflow channels is proportional to the diameter of the motor, that is, the larger the diameter of the motor, the greater the number of airflow channels, and the ratio of the motor diameter to the number of airflow channels should be selected. Between 15-22, or the number of second openings is proportional to the diameter of the motor, when the diameter of the motor is larger, the number of second openings communicating with the gap is greater, thereby ensuring the heat dissipation effect of the motor.

All air flow passages are evenly distributed on the support 10 in an annular shape with the axis of the rotor 3 as the center line, that is, the radial flow passages 9' are annular, and all the axial flow passages 9 are connected to the annular radial flow passages. 9' is connected, and all the axial flow channels 9 are circularly distributed with the rotating shaft of the rotor 3 as the axis, ensuring that the air outlet end of the axial flow channel 9 exists in each position of the rotor cavity, and ensuring the uniformity of the stator 2 and the rotor 3. cool down.

The support 10 includes a left support and a right support, the air flow channel arranged in the left support is the first air flow channel, the air flow channel arranged in the right support is the second air flow channel, and the first air flow channel is the first air flow channel. One end of the channel is communicated with the air inlet 6, the other end is communicated with the gap 4, one end of the second air flow channel is communicated with the air outlet 7, and the other end is communicated with the gap 4, that is, the cooling air enters the first air flow channel from the left support. , and flows into the rotor cavity under the action of all the axial flow channels 9 on the left support for cooling, and then passes through the gap 4 to the other end of the flow channel rotor 3, and under the action of the axial flow channels 9 on the right support After the lower collection, it merges into the second airflow channel, and is finally discharged from the air outlet 7 to complete the gas cooling process.

As another embodiment, the support 10 includes a left support and a right support, the air flow channel provided in the right support is the first air flow channel, and the air flow channel provided in the left support is the second air flow One end of the first air flow channel is communicated with the air inlet 6, the other end is communicated with the gap 4, one end of the second air flow channel is communicated with the air outlet 7, and the other end is communicated with the gap 4, that is, the cooling air is connected by the right branch. The seat enters the first air flow channel, and flows into the rotor cavity under the action of all the axial flow channels 9 on the right support for cooling, and then passes through the gap 4 to the other end of the flow channel rotor 3, and passes through the other end of the flow channel on the left support. Under the action of the axial flow channel 9, the gas is collected and merged into the second air flow channel, and finally discharged from the air outlet 7 to complete the gas cooling process.

In the motor with dual cooling effects provided by the present disclosure, the cooling circulation pipe of the water circulation pipe is arranged between the stator and the casing, and the cooling circulation pipe of the water circulation pipe is spirally arranged, and the cooling circulation pipe of the water circulation pipe is added to the stator. At the same time, the air-cooled gas is introduced into the rotor cavity by setting the air flow channel, and the axial flow channel is set to have a certain inclination angle to achieve 360° annular blowing cooling. At the same time, the airflow in the axial flow channel The direction is the same as the rotation direction of the rotor, which can make the airflow generate a certain driving force on the rotor and reduce the working power consumption.

A centrifugal air compressor includes the above-mentioned motor.

The above embodiments only represent several embodiments of the present disclosure, and the descriptions thereof are relatively specific and detailed, but should not be construed as limiting the scope of the present disclosure. It should be noted that, for those skilled in the art, without departing from the concept of the present disclosure, several modifications and improvements can be made, which all belong to the protection scope of the present disclosure. Accordingly, the scope of protection of the present disclosure should be determined by the appended claims.

Claims

A motor comprising:

The casing (1) is provided with an air inlet (6) and an air outlet (7);

a stator (2), which is arranged inside the casing (1), and a rotor cavity is arranged in the stator (2); and

a rotor (3), which is rotatably arranged inside the rotor cavity, and a gap (4) is arranged between the rotor (3) and the stator (2);

cooling circuit (5); and

The gas flow channel comprises the air inlet (6), the gap (4) and the air outlet (7) which are communicated in sequence.
The motor according to claim 1, wherein the casing (1) is a cylindrical structure, and the cooling circulation pipe (5) is spirally wound around the casing (1) along the axis of the cylindrical structure. )superior.
The motor according to claim 1 or 2, wherein the cooling circulation line (5) is provided between the housing (1) and the stator (2).
The motor according to any one of claims 1-3, further comprising a cooling cylinder (8), wherein the cooling cylinder (8) has a cylindrical structure, and the cooling cylinder (8) is sleeved on the stator (2) ) and the casing (1), and the cooling circulation pipeline (5) is arranged between the casing (1) and the cooling cylinder (8).
The motor according to claim 4, further comprising two sealing rings, which are respectively provided at two ends of the cooling cylinder (8).
The electric machine according to claim 4 or 5, wherein the cooling cylinder (8) is an interference fit with the stator (2).
The motor according to any one of claims 1 to 6, further comprising a support (10), and the end of the rotor (3) is disposed on the housing (1) through the support (10), The gas flow channel also includes an air flow channel arranged in the support (10), and the first end of the air flow channel is communicated with the air inlet (6) or the air outlet (7), so The second end of the air flow channel is communicated with the gap (4).
The motor according to claim 7, wherein the support (10) has an end surface facing the rotor (3) and a peripheral side surface perpendicular to the end surface, and the first end of the air flow channel is provided at the end surface. On the peripheral side surface, the second end is arranged on the end surface.
The electric machine according to claim 8, wherein the air flow channel comprises a radial flow channel (9') and an axial flow channel (9) communicated in sequence, the radial flow channel (9') being away from the shaft One end of the flow channel (9) constitutes the first end, the end of the axial flow channel (9) away from the radial flow channel (9') constitutes the second end, and the axial flow channel (9) constitutes the second end. The axis of the track (9) has an included angle with the axis of the rotor (3).
The motor according to claim 9, wherein the inclination direction of the included angle is the same as the rotation direction of the rotor (3).
The motor according to claim 9 or 10, wherein the angle of the included angle ranges from 20° to 70°.
The motor according to any one of claims 7 to 11, wherein the gas flow channel further comprises an annular flow channel (11) provided in the support (10), the annular flow channel (11) being a surrounding An annular groove of the axis of the rotor (3), a first opening is provided on the peripheral side of the annular groove, and a second opening is provided on the end surface of the annular groove close to the gap (4), and the first opening is provided on the circumferential side of the annular groove. An opening communicates with the air inlet (6) or the air outlet (7), and the second opening communicates with the gap (4).
The motor according to claim 12, wherein the first opening is arranged corresponding to the air inlet (6), or the first opening is arranged corresponding to the air outlet (7).
The motor according to claim 12 or 13, wherein the longitudinal section of the annular groove is a trapezoid, the first opening is arranged on the oblique side of the trapezoid, and the second opening is arranged on the upper surface of the trapezoid. base or the lower base of the trapezoid.
The motor according to any one of claims 7 to 14, wherein the number of the air flow channels is multiple, and the number of the air flow channels is proportional to the diameter of the motor.
The motor according to claim 15, wherein all the airflow passages are uniformly distributed in the support (10) in a ring shape with the axis of the rotor (3) as the centerline.
The motor according to any one of claims 7 to 16, wherein:

There are two said supports (10), including a left support and a right support. The air flow channel provided in the left support is the first air flow channel, which is provided in the right support The air flow channel is a second air flow channel, one end of the first air flow channel is communicated with the air inlet (6), the other end is communicated with the gap (4), and one end of the second air flow channel is connected communicate with the air outlet (7), and the other end communicates with the gap (4); or

There are two said supports (10), including a left support and a right support. The air flow channel provided in the right support is the first air flow channel, which is provided in the left support The air flow channel is a second air flow channel, one end of the first air flow channel is communicated with the air inlet (6), and the other end is communicated with the gap (4), and the second air flow channel One end is communicated with the air outlet (7), and the other end is communicated with the gap (4).
A centrifugal air compressor, comprising the motor according to any one of claims 1 to 17.