KR20110128680A - Electric scroll compressor drive structure - Google Patents

Abstract

The present invention provides a housing having a coolant suction port through which a refrigerant is sucked in and a coolant discharge port through which the sucked refrigerant is compressed and discharged; It includes a rotating rotor, the rotor provides a structure of the electric scroll compressor drive unit formed with one or a plurality of cooling holes in the longitudinal direction to cool the rotor is introduced into the refrigerant sucked through the refrigerant inlet.
Therefore, the present invention forms a plurality of cooling holes through which the refrigerant can be introduced into the rotor of the electric scroll compressor driving unit, thereby securing the cooling flow path, thereby improving the cooling property and performance of the driving unit, and together with the weight saving effect and required. It is economical because it can reduce raw materials.

Description

{Structure of driving part in electromotive scroll compressor}

The present invention relates to a structure of an electric scroll compressor drive unit, and more particularly, to a structure of an electric scroll compressor drive unit that can improve the cooling efficiency and reduce the weight.

In general, the electric scroll compressor includes a housing having a refrigerant inlet through which a refrigerant is introduced and a refrigerant discharge port through which the refrigerant is introduced and compressed, a driving unit for generating rotational force, a turning scroll for turning by the driving unit, and the It is coupled to the housing and its position is fixed and includes a scroll compressor for compressing the refrigerant having a fixed scroll to form a compression chamber between the rotating scroll. The drive unit includes a stator located in the housing and formed in an annular shape, and a rotor positioned inside the stator, and a drive shaft is axially coupled to the center of the rotor while interlocking with the rotor integrally. .

On the other hand, the driving unit of the electric scroll compressor, due to its characteristics generate a lot of heat, this heat is a factor that greatly affects the performance of the electric scroll compressor driving unit. Thus, conventionally, in order to cool the heat generated by the driving unit, a method of changing the shape of the stator or improving the structure of the housing has been adopted.

However, when the shape of the stator changes the shape of the stator or the conventional electric scroll compressor driving unit changes the shape of the stator, there is a concern that the cooling flow resistance increases due to the increase in the stator's gradation rate, thereby reducing the cooling efficiency. In addition, there is a problem in that the volume of the entire housing is increased when the structure of the housing is improved, such as forming a refrigerant inlet in the housing to allow the refrigerant to flow therein.

SUMMARY OF THE INVENTION An object of the present invention is to provide a structure of an electric scroll compressor drive unit which forms a cooling flow path in a rotor of an electric scroll compressor drive unit to improve the cooling property of the drive unit and reduce the weight.

The present invention includes a housing having a refrigerant suction port through which a refrigerant is sucked in and a refrigerant discharge port through which the sucked refrigerant is compressed and discharged, a stator disposed in an annular shape within the housing, and rotatably positioned inside the stator. And a rotor having a drive shaft coupled thereto, wherein the rotor has a structure of an electric scroll compressor driving unit in which one or more cooling holes are formed in a longitudinal direction to cool the rotor by introducing the refrigerant sucked through the refrigerant inlet. to provide.

Therefore, the present invention forms a plurality of cooling holes through which the refrigerant can be introduced into the rotor of the electric scroll compressor driving unit, thereby securing the cooling flow path, thereby improving the cooling property and performance of the driving unit, and together with the weight saving effect and required. 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.
3 is a front view illustrating the driving unit and the cooling hole of FIG. 2.
4 is a view showing a simulation of the cooling performance of the drive unit by the cooling hole in FIG.

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

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

1 and 2, the electric scroll compressor 800 according to an embodiment of the present invention, the driving force is supplied by electricity, including a housing 100, a drive shaft 530, the rotational force is generated It includes a drive unit 500 and a scroll compressor 700 receives the rotational force from the drive unit 500 to compress the refrigerant, the drive unit 500 of the electric scroll compressor 800 is the refrigerant flows to improve the cooling It is a structure that can be made.

The housing 100 has a coolant inlet 110 through which a coolant flows in one upper portion thereof, and a coolant discharge port 120 through which the coolant introduced in one front side is compressed and discharged.

The scroll compression unit 700 includes a swing scroll 200 and a fixed scroll 300. The pivoting scroll 200 is accommodated in the housing 100 to make a pivoting motion by the driving force transmitted from the driving part 500, and has a spiral pivoting wrap 210. The fixed scroll 300 is coupled to the housing 100 in the housing 100 and its position is fixed, and the pivoting scroll 200 is spaced between the pivoting wrap 210 and the pivoting wrap 210. In order to define the compression chamber (B), a spiral fixed wrap (310) corresponding to the pivot wrap (210) is provided.

Between the drive unit 500 and the orbiting scroll 200, an eccentric operation unit 400 is rotatably coupled to one end of the drive shaft 530 to induce a pivoting movement of the orbiting scroll 200. have. Here, the eccentric operation unit 400 is coupled so that its rotation center is eccentric with respect to the rotation center of the drive shaft 530, and thus the eccentric operation unit 400 is rotated according to the rotation of the drive shaft 530. In combination with the drive shaft 530 and the rotational movement and at the same time the relative sliding movement with respect to the drive shaft 530 and the rotary rotational movement can be induced to the pivoting movement of the swinging scroll (200). In this embodiment, the eccentric operating unit 400, including the swing scroll 200, the sliding bush eccentrically coupled to the drive shaft 530 is shown as an example, this is a crank pin or eccentric bush as an embodiment The back is located between the drive shaft 530 and the swing scroll 200, any configuration that induces the swing movement of the swing scroll 200 is possible. In addition, reference numeral 410 denotes a rotation preventing means 410.

The drive unit 500 is supplied with a driving force by electricity, and includes a stator 510, a rotor 520, and a drive shaft 530.

The stator 510 is a stator, which is located inside the housing 100, and has an annular stator slot 514 having a space in a center portion thereof, and a coil wound around the stator slot 514 as shown in FIG. 2. 512. The stator slot 514 may include a plurality of shoes 5141 having one side facing the outer circumferential surface of the rotor 520 and an integrally protruding radially integrally extending from the other side of the shoe 5151 to the outside. A plurality of teeth 5142 wound around the coil 512 and an inner side of which is integrally formed on the outside of the teeth 5152, and an outer circumferential surface of an arc shape faces the inner circumferential surface of the housing 100. A portion 5503 is included.

The rotor 520 is a rotor, the rotor core 522 is disposed rotatably at a predetermined interval inside the stator 510, the drive shaft 530 is coupled to the central portion in a cylindrical shape, and The rotor core 522 includes a plurality of permanent magnets 524 inserted at different intervals and arranged at equal intervals along the periphery of the rotor core 522. In this case, spacers 525 of a predetermined space are formed at both ends of the permanent magnet 524 to increase magnetic resistance to prevent magnetic flux leakage. On the other hand, the rotor core 522 of the rotor 520 is formed with a plurality of cooling holes 600 in the circumferential direction, a detailed description thereof will be described later.

On the other hand, the driving unit 500 of the electric scroll compressor according to the present embodiment, it can achieve a miniaturization, light weight in terms of volume and weight, can achieve high efficiency and high performance, the response to the input is quick and easy to control the speed Brushless DC motor (brushless DC motor), and in detail, the permanent permanent magnet 524 is inserted into the interior of the rotor 520 IPM (Interior permanent magnet type) BLDCM (brushless DC motor) or PMSM (Permanent magnet synchronous motor), but is not limited to this. In addition, in the present embodiment, the stator slot 514 of the stator 510 is formed of an annular body, but the plurality of split cores can reduce the size and capacity of the stator 510. It is also possible to apply a stator in which the array is combined in an annular shape.

 3 is a view showing a drive unit and a cooling hole 600 according to the present embodiment. Referring to the drawings, the rotor 520 according to the present embodiment has a plurality of cooling in the longitudinal direction of the rotor core 522. The holes 600 are formed through. In this case, the number of the cooling holes 600 may vary depending on the size and design of the rotor core 522. In addition, the cooling holes 600 are annularly arranged along the outer periphery of the rotor core 522 between the drive shaft 530 and the permanent magnet 524.

According to the above, in the present embodiment, the refrigerant introduced through the refrigerant inlet 110 into the cooling hole 600 formed through the longitudinal direction while being arranged in an annular shape along the outer side of the rotor core 522 from the rear It flows in and moves along the cooling hole 600 and flows outwards to be discharged to the front or side of the housing 100. Thus, the cooling hole 600 serves as a refrigerant flow path through which the refrigerant flows. As a result, cooling of the rotor 520 can be effectively performed.

Here, the cooling hole 600, to maximize the cooling effect due to the refrigerant by forming the cross-sectional area as large as possible, to minimize the impact 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 that can affect the magnetic field of the) and the drive shaft 530 that can less affect the magnetic field of the permanent magnet 524 It is formed larger than the radius of curvature of the opposing second surface R2.

In addition, the cooling hole 600 is formed in a substantially circular shape that can minimize the flow resistance of the refrigerant. However, this is a preferred embodiment of the cross-section can be formed in various shapes as well. In the drawing, although the cooling hole 600 is formed in a circular shape having a different radius of curvature of the first surface and the second surface, the cooling hole 600 may be formed in various shapes such as an ellipse or a set polygon. Although not yet, the cooling hole 600 is disposed between the drive shaft 530 and the permanent magnet 524, the first facing the permanent magnet 524 that can affect the magnetic field of the permanent magnet 524 Three surfaces are smoothly formed in the circumferential direction of the rotor 520 than the fourth surface facing the drive shaft 530 that can less affect the magnetic field of the permanent magnet 524.

Meanwhile, the cooling hole 600 is formed at a position corresponding to the plurality of permanent magnets 524.

In addition, the cooling hole 600 has a symmetry structure, and the cross-sectional side surface is formed in a symmetrical shape that is easy to process, and is arranged side by side when the cooling hole 600 is formed of a plurality of cooling holes 600. Are arranged symmetrically about a radial axis A in the radial direction passing through the center of the rotor 520.

As described above, the present embodiment, by forming a plurality of cooling holes 600 through which the refrigerant flows in the rotor 520, it is possible to effectively cool the rotor 520, which is shown in FIG. This can be seen in the simulation results. Furthermore, the present embodiment not only improves the performance of the driving part 500 due to the excellent cooling property of the rotor 520, but also demagnetization of the permanent magnet 524 embedded in the rotor core 522. It is economical because it can achieve the effect of preventing, reduce the weight and reduce the raw materials required.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

100 ... housing 200 ... pivoting scroll
300 ... fixed scroll 400 ... eccentric actuator
500 ... drive part 510 ... stator
512 ... coil 514 ... stator slot
520 ... rotor 522 ... rotor core
524 ... permanent magnet 530 ... drive shaft
600 ... cooling hole 700 ... scroll compressor
800 ... Electric Scroll Compressor

Claims (8)

A housing having a coolant suction port through which the coolant is sucked in and a coolant discharge port through which the sucked coolant is compressed and discharged; Includes a rotor,
The rotor has a structure of the electric scroll compressor drive unit formed with one or a plurality of cooling holes in the longitudinal direction to cool the rotor is introduced into the refrigerant sucked through the refrigerant inlet. The method according to claim 1,
The rotor is provided with a permanent magnet along the outside,
The cooling hole is disposed between the drive shaft and the permanent magnet, the radius of curvature of the first surface facing the permanent magnet, which may affect the magnetic field of the permanent magnet, has less influence on the magnetic field of the permanent magnet. The structure of the electric scroll compressor drive unit is formed larger than the radius of curvature of the second surface facing the drive shaft. The method according to claim 1,
The rotor is provided with a permanent magnet along the outside,
The cooling hole is disposed between the drive shaft and the permanent magnet, the third surface facing the permanent magnet that can affect the magnetic field of the permanent magnet, can less affect the magnetic field of the permanent magnet The structure of the electric scroll compressor drive unit is formed in a circumferential direction than the fourth surface facing the drive shaft. The method according to claim 2 or 3,
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 the outer edge of the rotor core.
The cooling hole is formed in the rotor core, the structure of the electric scroll compressor drive unit formed in a position corresponding to between the permanent magnets. The method according to any one of claims 1 to 3,
The cooling hole has a structure of a motor-driven scroll compressor drive formed symmetrically. The method according to claim 5,
The electric scroll compressor driving unit,
The structure of an electric scroll compressor drive, which is a brushless DC motor (BLDCM) or a permanent magnet synchronous motor (PMSM) of the interior permanent magnet type (IPM type). The method according to claim 5,
The plurality of cooling holes are arranged along the outside of the rotor,
And the plurality of cooling holes are arranged to be symmetrical to a radial virtual axis passing through the center of the rotor. The method according to claim 5,
The refrigerant flowing through the refrigerant inlet is located on the outer circumferential rear surface of the housing, flowing into the rear of the cooling hole flows out of the front of the cooling hole discharged to the front of the housing or to the side of the housing structure.

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