KR101692870B1 - Structure of driving part in electromotive scroll compressor - Google Patents

Abstract

The present invention relates to a refrigerator comprising: a housing having a refrigerant inlet port through which a refrigerant is sucked and a refrigerant outlet port from which a sucked refrigerant is compressed and discharged; a stator arranged annularly in the housing; The rotor is provided with one or a plurality of cooling holes in the longitudinal direction so as to cool the rotor so that the refrigerant sucked through the refrigerant inlet is introduced into the rotor, thereby providing a structure of an electric scroll compressor drive unit.
Therefore, the present invention can improve the cooling performance and the performance of the driving unit by forming a plurality of cooling holes into which the coolant can flow into the rotor of the electric scroll compressor driving unit and securing the cooling channel, It is economical because it can reduce raw materials.

Description

[0001] The present invention relates to an electric scroll compressor,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an electric scroll compressor driving unit, and more particularly, to a structure of an electric scroll compressor driving unit capable of improving cooling efficiency and reducing weight.

Generally, an electric scroll compressor includes a housing having a refrigerant inlet port through which a refrigerant flows and a refrigerant outlet port through which the refrigerant is introduced and discharged, a driving section generating a rotational force, a orbiting scroll rotating by the driving section, And a scroll compressor for fixing the refrigerant in the fixed scroll, wherein the fixed scroll has a fixed position in association with the housing and forms a compression chamber between the scroll compressor and the orbiting scroll. The driving unit includes a stator formed inside the housing and formed in an annular shape, and a rotor positioned inside the stator, and a driving shaft that rotates integrally with the rotor is axially coupled to the center of the rotor .

On the other hand, the driving part of the electric scroll compressor has a large amount of heat due to its characteristics, and this heat greatly influences the performance of the electric scroll compressor driving part. In order to cool the heat generated by the driving unit as described above, conventionally, a method of changing the shape of the stator or improving the structure of the housing has been adopted.

However, in the conventional electric scroll compressor drive unit in which the shape of the stator is changed or the structure of the housing is improved, when the shape of the stator is changed, the resistance of the refrigerant passage due to the increase in the rate of increase of the stator increases, There is a problem in that the volume of the entire housing is increased if the structure of the housing is improved such as forming a refrigerant suction port in the housing to allow the refrigerant to flow in.

It is an object of the present invention to provide a structure of an electric scroll compressor drive unit in which the cooling channel is formed in the rotor of the electric scroll compressor drive unit to improve the cooling performance of the drive unit and to reduce the weight.

The present invention relates to a refrigerator comprising: a housing having a refrigerant inlet port through which a refrigerant is sucked and a refrigerant outlet port from which the sucked refrigerant is compressed and discharged; a stator arranged annularly in the housing; The structure of the electric scroll compressor drive unit includes a rotor having a drive shaft coupled to the rotor, and one or a plurality of cooling holes formed in a longitudinal direction of the rotor to allow the coolant drawn through the coolant inlet to flow therethrough to cool the rotor. to provide.

Therefore, the present invention can improve the cooling performance and the performance of the driving unit by forming a plurality of cooling holes into which the coolant can flow into the rotor of the electric scroll compressor driving unit and securing the cooling channel, It is economical because it can reduce raw materials.

1 is a front sectional view showing an electric scroll compressor according to an embodiment of the present invention.
2 is a cross-sectional view taken along a line II-II in Fig.
Fig. 3 is a front view showing the driving part and the cooling hole of Fig. 2;
FIG. 4 is a graph showing the cooling performance of the driving part by the cooling holes in FIG. 3.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front sectional view showing an electric scroll compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along a line II-II in FIG. FIG. 3 is a front view showing a driving part and a cooling hole of FIG. 2, and FIG. 4 is a diagram showing a cooling performance of a driving part by a cooling hole in FIG.

1 and 2, an electric scroll compressor 800 according to an embodiment of the present invention includes a housing 100 and a drive shaft 530 to which a driving force is supplied, And a scroll compressor 700 for receiving a rotational force from the driving unit 500 and compressing the refrigerant. The driving unit 500 of the electric scroll compressor 800 includes a driving unit 500, And the like.

The housing 100 has a refrigerant inlet 110 through which refrigerant flows into the upper portion of the housing 100 and a refrigerant outlet 120 through which the refrigerant introduced into the front portion of the housing 100 is compressed and discharged.

The scroll compressor (700) includes an orbiting scroll (200) and a fixed scroll (300). The orbiting scroll 200 is accommodated in the housing 100 and is swiveled by the driving force transmitted from the driving unit 500 and has a spiral orbiting wrap 210. The fixed scroll 300 is coupled with the housing 100 in the housing 100 and is fixed in position with respect to the orbiting scroll 210 when the orbiting scroll 200 is pivotally moved. And a helical fixed lap 310 that engages and mates with the orbiting wrap 210 to define a compression chamber (B).

An eccentric operation part 400 is rotatably coupled between the driving part 500 and the orbiting scroll 200 to guide the orbiting motion of the orbiting scroll 200 to one end of the driving shaft 530 have. The eccentric actuating part 400 is coupled to the eccentric actuating part 400 such that the center of rotation of the eccentric actuating part 400 is eccentric with respect to the center of rotation of the driving shaft 530. Accordingly, The swiveling motion of the orbiting scroll 200 can be guided by the swiveling movement of the swiveling scroll 530 in conjunction with the driving shaft 530 while performing a rotary motion and a relative sliding motion with respect to the driving shaft 530. In this embodiment, the eccentric operation unit 400 is shown as an example of a sliding bushing including the orbiting scroll 200 and coupled eccentrically to the drive shaft 530. However, as an example, the eccentric operation unit 400 may include a crank pin or an eccentric bush And the swirling motion of the orbiting scroll 200 may be provided between the drive shaft 530 and the orbiting scroll 200. [ In addition, reference numeral 410 denotes an anti-rotation means 410.

The driving unit 500 includes a stator 510, a rotor 520, and a driving shaft 530. The driving unit 500 includes a stator 510, a rotor 520, and a driving shaft 530.

The stator 510 is a stator. The stator 510 includes an annular stator slot 514 which is located inside the housing 100 and has a space at the center as shown in Fig. 2, and a coil 514 wound around the stator slot 514. [ (512). The stator slot 514 includes a plurality of shoe 5141 whose one side faces the outer circumferential surface of the rotor 520 and a plurality of shoe 5141 which protrudes and extends integrally in the radial direction from the other side of the shoe 5141, A plurality of teeth 5142 through which the coil 512 is wound and an inner surface of the teeth 5142 which are integrally formed on the outer side of the teeth 5142 and whose outer circumferential surface is opposed to the inner circumferential surface of the housing 100, And a part 5143.

The rotor 520 includes a rotor core 522 rotatably disposed at an inner side of the stator 510 at a predetermined interval and having a cylindrical shape and a drive shaft 530 coupled to the center of the rotor core 522, And a plurality of permanent magnets 524 inserted in the rotor core 522 while being spaced apart from one another with mutually different poles along the circumference of the rotor core 522 in the circumferential direction. At this time, spacers 525 are formed in both ends of the permanent magnet 524 in a predetermined space to increase magnetic resistance to prevent magnetic flux leakage. A plurality of cooling holes 600 are formed in the rotor core 522 of the rotor 520 along the circumferential direction, and a detailed description thereof will be described later.

Meanwhile, the driving unit 500 of the electric scroll compressor according to the present embodiment can achieve miniaturization and weight reduction in terms of volume and weight, high efficiency, high performance, quick response to input, easy speed control (BLDCM) (brushless DC motor) of interior permanent magnet type in which permanent magnets 524 are inserted into the rotor 520, or a brushless DC motor such as PMSM (Permanent magnet Synchronous Motor). However, the present invention is not limited to this. In this embodiment, the stator 510 is a stator slot 514 formed of a single annular body. However, it is possible to reduce the size of the stator 510 and to improve the output, A stator having an annular shape may be used.

 3, the rotor 520 according to the present embodiment includes a plurality of cooling holes (not shown) in the longitudinal direction of the rotor core 522, Holes 600 are formed through the through holes. At this time, the number of the cooling holes 600 may be varied according to the size and design of the rotor core 522. The cooling holes 600 are annularly arranged along the outer periphery of the rotor core 522 between the driving shaft 530 and the permanent magnet 524. [

According to the above description, the refrigerant introduced into the cooling hole 600 through the coolant inlet port 110, which is arranged in an annular shape along the outer periphery of the rotor core 522 and penetrates along the longitudinal direction, The refrigerant flows into the cooling hole 600 and flows forward to be discharged to the front or the side of the housing 100. The cooling hole 600 functions as a refrigerant flow path through which the refrigerant flows The cooling of the rotor 520 can be effectively performed.

Here, the cooling hole 600 is formed to have a maximum cross-sectional area to maximize the cooling effect due to the coolant. In order to minimize the influence of the coolant on the magnetic field of the permanent magnet 524, the permanent magnet 524 The radius of curvature of the first surface R1 facing the permanent magnet 524 which may affect the magnetic field of the permanent magnet 524 is less than the radius of curvature of the drive shaft 530, Is larger than the radius of curvature of the opposing second surface (R2).

In addition, the cooling holes 600 are formed in a substantially circular shape in which the flow resistance of the refrigerant can be minimized. However, it is a matter of course that the cross-section can be formed in various shapes as a preferred embodiment. In the meantime, although the cooling holes 600 are formed in circular shapes having different curvature radii between the first surface and the second surface, when the cooling holes 600 are formed in various shapes such as an ellipse or a set polygon, The cooling hole 600 is formed between the driving shaft 530 and the permanent magnet 524 and the cooling hole 600 is formed between the driving shaft 530 and the permanent magnet 524, Three surfaces are gently formed in the circumferential direction of the rotor 520 relative to the fourth surface opposite to the drive shaft 530, which has less influence on the magnetic field of the permanent magnet 524.

Meanwhile, the cooling holes 600 are formed at positions corresponding to the spaces between the plurality of permanent magnets 524.

The cooling holes 600 have a symmetric structure. The cooling holes 600 are symmetrical with respect to the cross-sectional shape. The cooling holes 600 have a plurality of cooling holes 600, Are arranged symmetrically with respect to a virtual imaginary axis (A) passing through the center of the rotor (520) in the radial direction.

As described above, the present embodiment can effectively cool the rotor 520 by forming a plurality of cooling holes 600 through which the coolant can flow in the rotor 520, It can be confirmed from simulation results. In addition, the present embodiment can improve the performance of the driving unit 500 due to the excellent cooling property of the rotor 520, as well as improve the demagnetization of the permanent magnets 524 embedded in the rotor core 522 It is possible to reduce the weight, and it is economical to reduce the amount of raw materials to be consumed.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100 ... housing 200 ... orbiting scroll
300 ... fixed scroll 400 ... eccentric operating part
500 ... driving part 510 ... stator
512 ... coil 514 ... stator slot
520 ... rotor 522 ... rotor core
524 ... permanent magnet 530 ... drive shaft
600 ... cooling hole 700 ... scroll compression section
800 ... electric scroll compressor

Claims (8)

A housing having a refrigerant inlet port through which the refrigerant is sucked and a refrigerant discharge port through which the sucked refrigerant is compressed and discharged; a stator arranged annularly in the housing; a drive shaft rotatably disposed inside the stator, And a rotor having a permanent magnet along an outer periphery thereof,
One or a plurality of cooling holes are formed in the longitudinal direction of the rotor so that the refrigerant sucked through the refrigerant inlet is introduced to cool the rotor,
The cooling hole is disposed between the drive shaft and the permanent magnet, and the radius of curvature of the first surface facing the permanent magnet, which may affect the magnetic field of the permanent magnet, is less influential on the magnetic field of the permanent magnet Wherein the second surface is larger than the curvature radius of the second surface facing the drive shaft.
delete The method according to claim 1,
The rotor is provided with a permanent magnet along an outer periphery thereof,
Wherein the cooling hole is disposed between the drive shaft and the permanent magnet and the third surface facing the permanent magnet capable of affecting the magnetic field of the permanent magnet is less likely to affect the magnetic field of the permanent magnet Wherein the first and second surfaces are gently formed in a circumferential direction with respect to a fourth surface facing the drive shaft. The method according to claim 1 or 3,
Wherein the rotor includes a rotor core rotatably disposed inside the stator and a plurality of the permanent magnets inserted into the rotor core while being arranged along an outer periphery of the rotor core,
Wherein the cooling holes are formed in the rotor core and are formed at positions corresponding to each other between the permanent magnets. The method according to claim 1 or 3,
Wherein the cooling holes are symmetrically formed. The method of claim 5,
The electric scroll compressor drive unit includes:
Structure of a motorized scroll compressor drive, which is a brushless DC motor (BLDCM) or a permanent magnet synchronous motor (PMSM) of IPM type (interior permanent magnet type). The method of claim 5,
A plurality of cooling holes are arranged along the outer periphery of the rotor,
Wherein the plurality of cooling holes are arranged to be symmetrical with respect to an imaginary axis in the radial direction passing through the center of the rotor. The method of claim 5,
Wherein the refrigerant introduced through the refrigerant suction port located on the outer peripheral rear surface of the housing flows into the rear of the cooling hole and flows out to the front of the cooling hole to be discharged to the front of the housing or to the side of the housing.

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