CN111490635A - Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor - Google Patents

Abstract

The invention discloses a motor cooling system of a centrifugal refrigeration compressor and a centrifugal refrigeration compressor, belonging to the field of compressors and comprising: a motor cylinder, a motor front cavity, a rotor, a stator and a motor rear cavity; a motor cylinder is provided with There are liquid inlet and air return port, and the stator and rotor are located in the motor cylinder, the motor front cavity is located at the front end of the motor cylinder, and the motor rear cavity is located at the rear end of the motor cylinder; the liquid inlet is communicated with the motor front cavity, 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, and the air return port is communicated with the rear cavity of the motor, wherein the rotor is provided with axial flow vanes, and the axial flow vanes are located in the first gap. Clearance with the rear end of the stator. In this scheme, by adding axial flow blades, the refrigerant in the front cavity of the motor is forced to be sucked into the rear cavity of the motor, the refrigerant flow is increased, and the cooling effect of the motor rotor is improved.

Description

Motor cooling system of centrifugal refrigeration compressor and centrifugal refrigeration compressor

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 a centrifugal refrigeration compressor.

Background technique

At present, the refrigerant of the centrifugal refrigeration compressor enters the front cavity of the motor after cooling the motor stator, and enters the back cavity of the motor through the air gap between the motor stator and the motor rotor. Because the air gap between the motor stator and the motor rotor is small, about 1.5mm To 4mm, the pressure difference between the front chamber of the motor and the back chamber of the motor is large, resulting in excessive liquid refrigerant accumulating in the front chamber of the motor, the refrigerant flow is small, and the cooling effect on the motor rotor is poor.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a motor cooling system for a centrifugal refrigeration compressor and a centrifugal refrigeration compressor, so as to solve at least one of the technical problems existing in the prior art. In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended to be an extensive review, nor is it intended to identify key/critical elements or delineate the scope of protection of these embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the detailed description that follows.

According to a first aspect of the embodiments of the present invention, a motor cooling system for a centrifugal refrigeration compressor is provided;

In some optional embodiments, the motor cooling system of the centrifugal refrigeration compressor includes: a motor cylinder, a motor front chamber, a rotor, a stator and a motor rear chamber;

The motor cylinder is provided with a liquid inlet and an air return port, and the stator and rotor are located in the motor cylinder, the motor front cavity is located at the front end of the motor cylinder, and the motor rear cavity is located in the motor cylinder. the rear end of the motor cylinder; the liquid inlet is communicated with the front chamber of the motor, a first gap is formed between the stator and the rotor, and the front chamber of the motor and the rear chamber of the motor pass through the The first gap is communicated, and the air return port is communicated with the rear cavity of the motor, wherein the rotor is provided with axial flow vanes, and the axial flow vanes are located at the back of the first gap and the stator. end.

In some optional embodiments, further, a second gap is provided between the stator and the motor cylinder, and the liquid inlet communicates with the front cavity of the motor through the second gap.

In some optional embodiments, further, a plurality of the axial flow vanes are arranged at intervals along the circumferential direction of the rotor.

In some optional embodiments, further, the distances between adjacent axial flow vanes are equal.

In some optional embodiments, further, the angle formed between the axial flow vanes and the axial direction of the rotor ranges from 25 degrees to 65 degrees.

In some optional embodiments, further, a concave cavity for the rotation of the axial flow blade is provided on the stator.

In some optional embodiments, further, the height of the axial flow vane is smaller than the distance between the bottom of the cavity and the rotor.

In some optional embodiments, further, the height of the first gap ranges from 1.5 mm to 4 mm.

In some optional embodiments, further, the liquid refrigerant enters the second gap from the liquid inlet and then enters the front cavity of the motor, and becomes a gaseous refrigerant after cooling the stator. Under the action of the axial flow vanes, it enters the rear cavity of the motor through the first gap, and flows back into the evaporator or the flasher from the air return port.

According to a second aspect of the embodiments of the present invention, a centrifugal refrigeration compressor is provided;

In some optional embodiments, the centrifugal refrigeration compressor includes a motor cooling system for any of the foregoing optional implementations of the centrifugal refrigeration compressor.

The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

Axial flow blades are arranged on the rotor, and the axial flow blades are located in the first gap and the rear end of the stator. By adding axial flow blades, the refrigerant in the front cavity of the motor is forced to be sucked into the rear cavity of the motor, and the flow of the refrigerant is increased to improve the rotor of the motor. cooling effect.

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.

Description of 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 structural diagram of a motor cooling system of a centrifugal refrigeration compressor according to an exemplary embodiment;

2 is a schematic cross-sectional structural diagram of a motor cooling system of a centrifugal refrigeration compressor according to an exemplary embodiment;

FIG. 3 is a schematic structural diagram from a perspective of a motor cooling system of a centrifugal refrigeration compressor according to an exemplary embodiment.

Reference number:

1-motor cylinder; 2-motor front cavity; 3-rotor; 4-stator; 5-first gap; 6-axial flow blade; 7-motor back cavity; 8-second gap; 9-liquid inlet; 10-Return port.

Detailed ways

The following description and drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. The examples represent only possible variations. Unless expressly required, individual components and functions are optional and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. The scope of embodiments of the invention includes the full scope of the claims, along with all available equivalents of the claims. Various embodiments may be referred to herein by the term "invention," individually or collectively, for convenience only, and are not intended to automatically limit the scope of this application to any if more than one invention is in fact disclosed. A single invention or inventive concept. Herein, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation and do not require or imply any actual relationship between these entities or operations or order. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method or apparatus comprising a list of elements includes not only those elements, but also others not expressly listed elements, or also include elements inherent to such a process, method or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in the process, method, or device that includes the element. The various embodiments herein are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and it is sufficient to refer to each other for the same and similar parts between the various embodiments. As for the methods, products, etc. disclosed in the embodiments, since they correspond to the method parts disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

According to a first aspect of the embodiments of the present invention, a motor cooling system for a centrifugal refrigeration compressor is provided;

As shown in FIGS. 1-3 , in some optional embodiments, the motor cooling system of the centrifugal refrigeration compressor includes: a motor cylinder 1 , a motor front chamber 2 , a rotor 3 , a stator 4 and a motor rear chamber 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 located in the motor cylinder 1 , and the motor front cavity 2 is located at the front end of the motor cylinder 1 . The rear cavity 7 of the motor is located at the rear end of the motor cylinder 1 ; the liquid inlet 9 is communicated with the front cavity 2 of the motor, and a first cavity is formed between the stator 4 and the rotor 3 Gap 5, the motor front cavity 2 is communicated with the motor rear cavity 7 through the first gap 5, and the air return port 10 is communicated with the motor rear cavity 7, wherein the rotor 3 is provided with Axial flow vanes 6 , and the axial flow vanes 6 are located at the rear end of the first gap 5 and the stator 4 .

In this embodiment, by adding axial flow blades 6 on the rotor 3 of the motor, after the axial flow blades 6 are in the first gap 5 between the stator 4 and the rotor 3, the axial flow blades 6 are driven by the rotary motion of the rotor 3 itself. The refrigerant in the first gap 5 between the stator 4 and the rotor 3 of the motor is sucked, the refrigerant flow is increased, the cooling effect of the rotor 3 is improved, and the accumulation of liquid refrigerant in the front cavity 2 of the motor is reduced.

Specifically, the high-temperature and high-pressure liquid refrigerant is taken from the condenser of the refrigeration system, and becomes 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 , after cooling the stator 4 into a gaseous refrigerant, the gaseous refrigerant enters the motor rear cavity 7 through the first gap 5 under the action of the axial flow blades 6, and flows back from the air return port 10 to the inside a vaporizer or flasher.

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 passes through the second gap 8 It is communicated with the front cavity 2 of the motor.

In this embodiment, it is convenient for the liquid refrigerant to enter into the front cavity 2 of the motor from the liquid inlet 9, and at the same time, the overall structure of the motor is simplified.

In some optional embodiments, further, as shown in FIG. 2 , a plurality of the axial flow vanes 6 are arranged at intervals along the circumferential direction of the rotor 3 .

In this embodiment, by setting the ground consistency of the plurality of axial flow vanes 6, when the plurality of axial flow vanes 6 rotate, the suction force of the airflow in the second gap 8 is stronger, which is convenient to increase the flow rate of the refrigerant.

On the basis of the above embodiment, further, the distances between the adjacent axial flow vanes 6 are equal.

In this embodiment, the uniformity of the suction force during the rotation of the axial flow vanes 6 is improved, thereby increasing the flow rate of the refrigerant.

In some optional embodiments, further, the angle formed between the axial flow vanes 6 and the axial direction of the rotor 3 ranges from 25 degrees to 65 degrees.

In this embodiment, the angle formed between the axial flow blades 6 and the axial direction of the rotor 3 is 25 degrees, or 30 degrees or 65 degrees, etc. The setting of the angle of the axial flow blades 6 is beneficial to improve the suction force when the axial flow blades 6 rotate. This increases the flow of refrigerant.

In some optional embodiments, further, the stator 4 is provided with a concave cavity for the rotation of the axial flow blade 6 .

In this embodiment, the arrangement of the concave cavity prevents the axial flow vane 6 from being too small to be ineffective. By arranging the concave cavity, the size of the axial flow vane 6 can be increased, thereby improving the suction force when it rotates.

On the basis of the above embodiment, further, the height of the axial flow vane 6 is smaller than the distance between the bottom of the cavity and the rotor 3 .

In this embodiment, the height of the axial flow vanes 6 is smaller than the distance between the bottom of the cavity and the surface of the rotor 3, that is, the straight-line distance between the stator 4 and the rotor 3, so as to avoid the axial flow vanes 6 from rotating with the stator 4. interference occurs.

In some optional embodiments, further, the height of the first gap 5 ranges from 1.5 mm to 4 mm.

In this embodiment, the height of the first gap 5 is in the range of 1.5mm to 4mm, which does not change the gap between the stator 4 and the rotor 3 in the prior art. In the prior art, the first gap 5 causes a large airflow resistance, If only the pressure difference between the front chamber 2 of the motor and the rear chamber 7 of the motor drives the refrigerant flow to cool the motor rotor 3, the refrigerant flow rate is low, and the cooling effect of the motor rotor 3 is poor. After the first gap 5 between the motor stator 4 and the motor rotor 3, the rotary motion of the motor rotor 3 itself is used to drive the blades to suck the refrigerant in the air gap between the motor stator 4 and the motor rotor 3, so as to increase the refrigerant flow and improve the cooling of the rotor 3. At the same time, the accumulation of liquid refrigerant in the front cavity 2 of the motor is reduced.

In a specific embodiment, as shown in FIG. 1 to FIG. 3 , the motor cylinder 1 is provided with a liquid inlet 9 and an air return port 10 , and the stator 4 and the rotor 3 are located in the motor cylinder 1 Inside, the motor front chamber 2 is located at the front end of the motor cylinder 1, the motor rear chamber 7 is located at the rear end of the motor cylinder 1; the liquid inlet 9 is connected to the motor front chamber 2 A first gap 5 is formed between the stator 4 and the rotor 3, the front cavity 2 of the motor and the rear cavity 7 of the motor are communicated through the first gap 5, and the air return port 10 is connected to the The rear cavity 7 of the motor is communicated with each other, a second gap 8 is provided between the stator 4 and the motor cylinder 1 , and the liquid inlet 9 is communicated with the front cavity 2 of the motor through the second gap 8 , wherein, the rotor 3 is provided with axial flow vanes 6, and the axial flow vanes 6 are located at the rear end of the first gap 5 and the stator 4, and a plurality of the axial flow vanes 6 are arranged along the The circumferential direction of the rotor 3 is arranged at intervals, and the distance between the adjacent axial flow blades 6 is equal. The stator 4 is provided with a cavity for the rotation of the axial flow blades 6, and the liquid refrigerant enters from the liquid inlet 9 The second gap 8 then enters the motor front cavity 2, and after cooling the stator 4, it becomes a gaseous refrigerant, and the gaseous refrigerant enters the motor through the first gap 5 under the action of the axial flow blades 6 back cavity 7, and flow back to the evaporator or flasher from the air return port 10. By adding axial flow vanes 6 on the rotor 3 of the motor, the axial flow vanes 6 are the first place between the stator 4 and the rotor 3. After the gap 5, the rotary motion of the rotor 3 is used to drive the axial flow blades 6 to suck the refrigerant in the first gap 5 between the stator 4 and the rotor 3 of the motor, increase the refrigerant flow, improve the cooling effect of the rotor 3, and reduce the front of the motor. The accumulation of liquid refrigerant in cavity 2.

According to a second aspect of the embodiments of the present invention, a centrifugal refrigeration compressor is provided;

In some optional embodiments, the centrifugal refrigeration compressor includes a motor cooling system for any of the foregoing optional implementations of the centrifugal refrigeration compressor.

The centrifugal refrigeration compressor provided in the second aspect has the motor cooling system for the centrifugal refrigeration compressor provided in the first aspect, and therefore has all the beneficial effects of the motor cooling system for the centrifugal refrigeration compressor provided in the first aspect. Not to repeat them one by one.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope. Furthermore, those skilled in the art will appreciate that although some of the embodiments described herein include certain features, but not others, included in other embodiments, that combinations of features of different embodiments are intended to be within the scope of the invention within and form different embodiments. For example, in the above claims, 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: a motor cylinder, a motor front chamber, a rotor, a stator and a motor rear chamber; The motor cylinder is provided with a liquid inlet and an air return port, and the stator and rotor are located in the motor cylinder, the motor front cavity is located at the front end of the motor cylinder, and the motor rear cavity is located in the motor cylinder. the rear end of the motor cylinder; the liquid inlet is communicated with the front chamber of the motor, a first gap is formed between the stator and the rotor, and the front chamber of the motor and the rear chamber of the motor pass through the The first gap is communicated, and the air return port is communicated with the rear cavity of the motor, wherein the rotor is provided with axial flow vanes, and the axial flow vanes are located at the back of the first gap and the stator. end. 2. The motor cooling system of a centrifugal refrigeration compressor according to claim 1, wherein, A second gap is set between the stator and the motor cylinder, and the liquid inlet communicates with the front cavity of the motor through the second gap. 3. The motor cooling system of the centrifugal refrigeration compressor according to claim 1, wherein, A plurality of the axial flow vanes are arranged at intervals along the circumferential direction of the rotor. 4. The motor cooling system of the centrifugal refrigeration compressor according to claim 3, wherein, The spacing between adjacent axial flow vanes is equal. 5. The motor cooling system of a centrifugal refrigeration compressor according to claim 1, wherein, The angle formed by the axial flow vanes and the axial direction of the rotor ranges from 25 degrees to 65 degrees. 6. The motor cooling system of a centrifugal refrigeration compressor according to claim 1, wherein, The stator is provided with a cavity for the rotation of the axial flow vanes. 7. The motor cooling system of the centrifugal refrigeration compressor according to claim 6, wherein, The height of the axial flow vane is smaller than the distance between the bottom of the cavity and the rotor. 8. The motor cooling system of a centrifugal refrigeration compressor according to any one of claims 1-7, wherein, The height of the first gap ranges from 1.5mm to 4mm. 9. The motor cooling system of a centrifugal refrigeration compressor according to claim 2, wherein, The liquid refrigerant enters the second gap from the liquid inlet and then enters the front cavity of the motor. After cooling the stator, it becomes a gaseous refrigerant, and the gaseous refrigerant passes through the first refrigerant under the action of the axial flow blades. The gap enters the back cavity of the motor, and flows back into the evaporator or flasher from the air return port. 10. A centrifugal refrigeration compressor, characterized by comprising the motor cooling system of the centrifugal refrigeration compressor according to any one of claims 1-9.

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