CN111490635A - Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor - Google Patents
Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor Download PDFInfo
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- CN111490635A CN111490635A CN201910083942.3A CN201910083942A CN111490635A CN 111490635 A CN111490635 A CN 111490635A CN 201910083942 A CN201910083942 A CN 201910083942A CN 111490635 A CN111490635 A CN 111490635A
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- 238000001816 cooling Methods 0.000 title claims abstract description 35
- 238000005057 refrigeration Methods 0.000 title claims abstract description 29
- 239000003507 refrigerant Substances 0.000 claims abstract description 51
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 11
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
- H02K9/20—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil wherein the cooling medium vaporises within the machine casing
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention discloses a motor cooling system of a centrifugal refrigeration compressor and the centrifugal refrigeration compressor, belonging to the field of compressors and comprising a motor cooling system; the motor comprises a motor barrel, a motor front cavity, a rotor, a stator and a motor rear cavity; the motor barrel is provided with a liquid inlet and an air return port, the stator and the rotor are positioned in the motor barrel, the front cavity of the motor is positioned at the front end part of the motor barrel, and the rear cavity of the motor is positioned at the rear end part of the motor barrel; the liquid inlet is communicated with the front cavity of the motor, a first gap is formed between the stator and the rotor, the front cavity of the motor is communicated with the rear cavity of the motor through the first gap, the air return port is communicated with the rear cavity of the motor, and the rotor is provided with axial flow blades which are positioned at the rear ends of the first gap and the stator. In this scheme, through increasing axial compressor blade, force the refrigerant with the motor front chamber to inhale the motor back chamber, increase the refrigerant flow, improve electric motor rotor's cooling effect.
Description
Technical Field
The invention relates to the technical field of refrigeration compressors, in particular to a motor cooling system of a centrifugal refrigeration compressor and the centrifugal refrigeration compressor.
Background
At present, after a refrigerant of a centrifugal refrigeration compressor cools a motor stator, the refrigerant enters a motor front cavity and enters a motor rear cavity through an air gap between the motor stator and a motor rotor, and because the air gap between the motor stator and the motor rotor is small and about 1.5mm to 4mm, the pressure difference between the motor front cavity and the motor rear cavity is large, excessive liquid refrigerant is gathered in the motor front cavity, the refrigerant flow is small, and the cooling effect on the motor rotor is poor.
Disclosure of Invention
The embodiment of the invention provides a motor cooling system of a centrifugal refrigeration compressor and the centrifugal refrigeration compressor, which are used for solving at least one technical problem in the prior art. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of embodiments of the present invention, there is provided a motor cooling system for a centrifugal refrigeration compressor;
in some alternative embodiments, the motor cooling system of the centrifugal refrigeration compressor comprises; the motor comprises a motor barrel, a motor front cavity, a rotor, a stator and a motor rear cavity;
the motor barrel is provided with a liquid inlet and an air return port, the stator and the rotor are positioned in the motor barrel, the front cavity of the motor is positioned at the front end part of the motor barrel, and the rear cavity of the motor is positioned at the rear end part of the motor barrel; the liquid inlet is communicated with the motor front cavity, a first gap is formed between the stator and the rotor, the motor front cavity is communicated with the motor rear cavity through the first gap, the air return port is communicated with the motor rear cavity, and the rotor is provided with axial flow blades which are positioned at the rear ends of the first gap and the stator.
In some optional embodiments, further, a second gap is provided between the stator and the motor cylinder, and the liquid inlet is communicated with the motor front cavity through the second gap.
In some optional embodiments, further, a plurality of the axial flow blades are arranged at intervals along the circumferential direction of the rotor.
In some optional embodiments, further, the distance between adjacent axial flow blades is equal.
In some optional embodiments, further, the axial flow blades form an angle with the axial direction of the rotor in a range of 25 to 65 degrees.
In some optional embodiments, further, a cavity for rotation of the axial flow blade is provided on the stator.
In some optional embodiments, further, the height of the axial flow blade is smaller than the distance between the bottom of the cavity and the rotor.
In some alternative embodiments, further, the first gap has a height in a range of 1.5mm to 4 mm.
In some optional embodiments, further, the liquid refrigerant enters the second gap from the liquid inlet and then enters the motor front cavity, and after cooling the stator, the liquid refrigerant becomes a gaseous refrigerant, and the gaseous refrigerant enters the motor rear cavity through the first gap under the action of the axial flow blade, and flows back to the evaporator or the flash tank from the return air port.
According to a second aspect of embodiments of the present invention, there is provided a centrifugal refrigeration compressor;
in some optional embodiments, the centrifugal refrigeration compressor comprises a motor cooling system of any one of the optional implementations of the centrifugal refrigeration compressor described above.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the axial flow blades are arranged on the rotor and located at the rear ends of the first gap and the stator, and by adding the axial flow blades, the refrigerant in the front cavity of the motor is forcibly sucked into the rear cavity of the motor, so that the flow of the refrigerant is increased, and the cooling effect of the motor rotor is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram illustrating the configuration of a motor cooling system for a centrifugal refrigerant compressor according to an exemplary embodiment;
FIG. 2 is a cross-sectional structural schematic view of a motor cooling system of a centrifugal refrigerant compressor in accordance with an exemplary embodiment;
fig. 3 is a schematic view of a motor cooling system of a centrifugal refrigerant compressor according to an exemplary embodiment.
Reference numerals:
1-a motor cylinder; 2-the front cavity of the motor; 3-a rotor; 4-a stator; 5-a first gap; 6-axial flow blades; 7-a rear cavity of the motor; 8-a second gap; 9-liquid inlet; 10-return air port.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
According to a first aspect of embodiments of the present invention, there is provided a motor cooling system for a centrifugal refrigeration compressor;
as shown in fig. 1-3, in some alternative embodiments, the motor cooling system of the centrifugal refrigeration compressor comprises; the motor comprises a motor cylinder 1, a motor front cavity 2, a rotor 3, a stator 4 and a motor rear cavity 7;
the motor cylinder 1 is provided with a liquid inlet 9 and an air return port 10, the stator 4 and the rotor 3 are positioned in the motor cylinder 1, the motor front cavity 2 is positioned at the front end part of the motor cylinder 1, and the motor rear cavity 7 is positioned at the rear end part of the motor cylinder 1; the liquid inlet 9 is communicated with the motor front cavity 2, a first gap 5 is formed between the stator 4 and the rotor 3, the motor front cavity 2 is communicated with the motor rear cavity 7 through the first gap 5, the air return port 10 is communicated with the motor rear cavity 7, wherein an axial flow blade 6 is arranged on the rotor 3, and the axial flow blade 6 is positioned at the rear end of the first gap 5 and the stator 4.
In this embodiment, the axial flow blade 6 is added to the rotor 3 of the motor, so that after the axial flow blade 6 is positioned in the first gap 5 between the stator 4 and the rotor 3, the rotation of the rotor 3 drives the axial flow blade 6 to suck the refrigerant in the first gap 5 between the stator 4 and the rotor 3 of the motor, thereby increasing the refrigerant flow, improving the cooling effect of the rotor 3, and simultaneously reducing the accumulation of the liquid refrigerant in the front cavity 2 of the motor.
Specifically, a high-temperature high-pressure liquid refrigerant is taken from a condenser of a refrigeration system, the high-temperature high-pressure liquid refrigerant is changed into a low-temperature liquid refrigerant through throttling, the low-temperature liquid refrigerant enters the second gap 8 from the liquid inlet 9 and then enters the motor front cavity 2, the stator 4 is cooled and then changed into a gaseous refrigerant, and the gaseous refrigerant enters the motor rear cavity 7 through the first gap 5 under the action of the axial flow blade 6 and flows back to the evaporator or the flash tank from the gas return port 10.
In some optional embodiments, further, as shown in fig. 2, a second gap 8 is provided between the stator 4 and the motor cylinder 1, and the liquid inlet 9 is communicated with the motor front cavity 2 through the second gap 8.
In the embodiment, liquid refrigerant can conveniently enter the front cavity 2 of the motor from the liquid inlet 9, and the whole structure of the motor is simplified.
In some optional embodiments, further, as shown in fig. 2, a plurality of axial flow blades 6 are provided at intervals along the circumferential direction of the rotor 3.
In this embodiment, the consistency of the axial flow blades 6 is set, so that the axial flow blades 6 have stronger suction force to the air flow in the second gap 8 when rotating, which is convenient for increasing the flow rate of the refrigerant.
On the basis of the above embodiment, further, the distance between adjacent axial flow blades 6 is equal.
In this embodiment, the uniformity of the suction force during the rotation of the axial flow blade 6 is improved, and the flow rate of the refrigerant is further improved.
In some optional embodiments, further, the axial flow blade 6 forms an angle in a range of 25 degrees to 65 degrees with the axial direction of the rotor 3.
In this embodiment, the axial flow blade 6 and the rotor 3 form an angle of 25 degrees, or 30 degrees or 65 degrees, and the angle of the axial flow blade 6 is favorable for increasing the suction force when the axial flow blade 6 rotates, thereby increasing the flow rate of the refrigerant.
In some optional embodiments, further, a cavity is provided on the stator 4 for rotation of the axial flow blades 6.
In this embodiment, the arrangement of the cavity prevents the axial flow blade 6 from being too small, and the size of the axial flow blade 6 can be increased by arranging the cavity, so that the suction force during rotation of the axial flow blade is improved.
On the basis of the above embodiment, further, the height of the axial flow blade 6 is smaller than the distance between the bottom of the cavity and the rotor 3.
In this embodiment, the height of axial blades 6 is less than the distance between the bottom of the cavity and the surface of rotor 3, i.e. the linear distance between stator 4 and rotor 3, so as to avoid axial blades 6 interfering with stator 4 when they rotate.
In some alternative embodiments, further, the height of the first gap 5 ranges from 1.5mm to 4 mm.
In this embodiment, the height range of the first gap 5 is 1.5mm to 4mm, the gap between the stator 4 and the rotor 3 in the prior art is not changed, the airflow resistance is large for the first gap 5 in the prior art, if the refrigerant flows to cool the motor rotor 3 only by the pressure difference between the motor front cavity 2 and the motor rear cavity 7, the refrigerant flow is low, and the cooling effect of the motor rotor 3 is poor, but the axial flow blade 6 is added on the motor rotor 3, and after the first gap 5 between the motor stator 4 and the motor rotor 3, the refrigerant in the air gap between the motor stator 4 and the motor rotor 3 is sucked by the rotating motion of the motor rotor 3 itself to increase the refrigerant flow, improve the cooling effect of the rotor 3, and reduce the liquid refrigerant concentration of the motor front cavity 2.
In a specific embodiment, as shown in fig. 1-3, a liquid inlet 9 and a gas return opening 10 are provided on the motor cylinder 1, the stator 4 and the rotor 3 are located in the motor cylinder 1, the motor front cavity 2 is located at the front end of the motor cylinder 1, and the motor rear cavity 7 is located at the rear end of the motor cylinder 1; the liquid inlet 9 is communicated with the motor front cavity 2, a first gap 5 is formed between the stator 4 and the rotor 3, the motor front cavity 2 is communicated with the motor rear cavity 7 through the first gap 5, the air return port 10 is communicated with the motor rear cavity 7, a second gap 8 is arranged between the stator 4 and the motor cylinder 1, the liquid inlet 9 is communicated with the motor front cavity 2 through the second gap 8, wherein axial flow blades 6 are arranged on the rotor 3, the axial flow blades 6 are positioned at the rear ends of the first gap 5 and the stator 4, the axial flow blades 6 are arranged at intervals along the circumferential direction of the rotor 3, the intervals between adjacent axial flow blades 6 are equal, a concave cavity for the axial flow blades 6 to rotate is arranged on the stator 4, and liquid refrigerant enters the second gap 8 from the liquid inlet 9 and then enters the motor front cavity 2, the stator 4 is cooled to become a gaseous refrigerant, the gaseous refrigerant enters the rear cavity 7 of the motor through the first gap 5 under the action of the axial flow blade 6 and flows back to the evaporator or the flash evaporator from the gas return port 10, the axial flow blade 6 is added on the rotor 3 of the motor, so that the axial flow blade 6 is arranged in the first gap 5 between the stator 4 and the rotor 3, the rotary motion of the rotor 3 is utilized to drive the axial flow blade 6 to suck the refrigerant in the first gap 5 between the stator 4 and the rotor 3 of the motor, the refrigerant flow is increased, the cooling effect of the rotor 3 is improved, and meanwhile, the gathering of the liquid refrigerant in the front cavity 2 of the motor is reduced.
According to a second aspect of embodiments of the present invention, there is provided a centrifugal refrigeration compressor;
in some optional embodiments, the centrifugal refrigeration compressor comprises a motor cooling system of any one of the optional implementations of the centrifugal refrigeration compressor described above.
The centrifugal refrigeration compressor provided by the second aspect has the motor cooling system of the centrifugal refrigeration compressor provided by the first aspect, and therefore, the overall beneficial effects of the motor cooling system of the centrifugal refrigeration compressor provided by the first aspect are not repeated herein.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims above, any of the claimed embodiments may be used in any combination. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Claims (10)
1. A motor cooling system for a centrifugal refrigeration compressor, comprising; the motor comprises a motor barrel, a motor front cavity, a rotor, a stator and a motor rear cavity;
the motor barrel is provided with a liquid inlet and an air return port, the stator and the rotor are positioned in the motor barrel, the front cavity of the motor is positioned at the front end part of the motor barrel, and the rear cavity of the motor is positioned at the rear end part of the motor barrel; the liquid inlet is communicated with the motor front cavity, a first gap is formed between the stator and the rotor, the motor front cavity is communicated with the motor rear cavity through the first gap, the air return port is communicated with the motor rear cavity, and the rotor is provided with axial flow blades which are positioned at the rear ends of the first gap and the stator.
2. Motor cooling system of a refrigerant centrifugal compressor according to claim 1,
a second gap is arranged between the stator and the motor cylinder, and the liquid inlet is communicated with the front cavity of the motor through the second gap.
3. Motor cooling system of a refrigerant centrifugal compressor according to claim 1,
the axial flow blades are arranged at intervals along the circumferential direction of the rotor.
4. Motor cooling system of a refrigerant centrifugal compressor according to claim 3,
the distance between the adjacent axial flow blades is equal.
5. Motor cooling system of a refrigerant centrifugal compressor according to claim 1,
the axial flow blades form an angle with the axial direction of the rotor in the range of 25 to 65 degrees.
6. Motor cooling system of a refrigerant centrifugal compressor according to claim 1,
and the stator is provided with a concave cavity for the rotation of the axial flow blades.
7. Motor cooling system of a refrigerant centrifugal compressor according to claim 6,
the height of the axial flow blade is smaller than the distance between the bottom of the concave cavity and the rotor.
8. Motor cooling system of a refrigerant centrifugal compressor according to any of claims 1 to 7,
the height of the first gap ranges from 1.5mm to 4 mm.
9. Motor cooling system of a refrigerant centrifugal compressor according to claim 2,
liquid refrigerant enters the second gap from the liquid inlet and then enters the front cavity of the motor, the liquid refrigerant is cooled to the stator and then becomes gaseous refrigerant, and the gaseous refrigerant enters the rear cavity of the motor through the first gap under the action of the axial flow blade and flows back to the evaporator or the flash evaporator from the air return port.
10. A centrifugal refrigeration compressor comprising an electric motor cooling system of a centrifugal refrigeration compressor according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910083942.3A CN111490635A (en) | 2019-01-29 | 2019-01-29 | Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910083942.3A CN111490635A (en) | 2019-01-29 | 2019-01-29 | Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor |
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| Publication Number | Publication Date |
|---|---|
| CN111490635A true CN111490635A (en) | 2020-08-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910083942.3A Pending CN111490635A (en) | 2019-01-29 | 2019-01-29 | Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023087786A1 (en) * | 2021-11-22 | 2023-05-25 | 青岛海尔空调电子有限公司 | Heat dissipation structure for compressor and compressor |
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| CN106246606A (en) * | 2016-09-19 | 2016-12-21 | 珠海格力电器股份有限公司 | Compressor and air conditioner |
| CN106329831A (en) * | 2016-09-20 | 2017-01-11 | 珠海格力电器股份有限公司 | Cooling structure of permanent magnet synchronous motor |
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| CN107634611A (en) * | 2017-10-18 | 2018-01-26 | 李记东 | Motor with novel cooling structure and include its fluid machinery |
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2019
- 2019-01-29 CN CN201910083942.3A patent/CN111490635A/en active Pending
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| CN102208845A (en) * | 2010-03-30 | 2011-10-05 | 株式会社日立制作所 | Permanent magnetic rotating electric machine and wind power generating system |
| CN202918135U (en) * | 2012-10-18 | 2013-05-01 | 上海汉钟精机股份有限公司 | Cooling structure of compressor motor |
| CN106050725A (en) * | 2015-04-02 | 2016-10-26 | 现代自动车株式会社 | Hyundai motor co., ltd. |
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| WO2023087786A1 (en) * | 2021-11-22 | 2023-05-25 | 青岛海尔空调电子有限公司 | Heat dissipation structure for compressor and compressor |
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Application publication date: 20200804 |