WO2020153682A1

WO2020153682A1 - Electric compressor

Info

Publication number: WO2020153682A1
Application number: PCT/KR2020/000918
Authority: WO
Inventors: 박현준; 김영민; 김홍민; 임권수
Original assignee: 한온시스템 주식회사
Priority date: 2019-01-25
Filing date: 2020-01-20
Publication date: 2020-07-30
Also published as: KR20200092668A

Abstract

The present invention relates to an electric compressor and, more specifically, the objective of the present invention is to promote the improvement of a cooling effect of wound coils through the movement stability of a refrigerant and by stably positioning a position-determining groove, formed in a stator core, on a flow path formed inside a driving part housing.

Description

Electric compressor

The present invention relates to a compressor, and more particularly, to an electric compressor that improves the cooling effect of a winding coil by improving the position and shape of a flow path through which the coolant moves and a positional defect groove of the stator core provided in the electric compressor. .

In general, a compressor installed to supply cooling air regulated to a specific temperature to a passenger on a vehicle has various types of structures, and an electric compressor is used as an example and will be described with reference to the drawings.

Referring to the attached Figure 1, the conventional electric compressor 10 is largely composed of a driving unit 3, a compression unit 5 and a control unit 7, the driving unit 3 is a driving unit housing forming an outer shape ( 30) and a stator 33 and a rotor 35 mounted coaxially in the drive unit housing 30.

The compression unit 5 is a compression unit housing 51 coupled to one side of the driving unit housing 30, a pivoting scroll 53 and a fixed scroll 55 mounted to rotate relative to the compression unit housing 51 ).

The control unit 7 is configured to include various driving circuits and elements such as a cover housing 75 that is formed on the outside and is coupled to the other side of the driving unit housing 30 and a PCB 78 mounted inside the cover housing 75. .

When the refrigerant is to be compressed by the motor-driven compressor 10, external power is applied to the control unit 7 through a connection terminal or the like, and the control unit 7 signals an operation to the driving unit 3 through a driving circuit or the like. To send.

When the operation signal is transmitted to the driving unit 3, the stator 33 in the form of an electromagnet pressed into the inner circumferential surface of the driving unit housing 30 is excited and magnetic, and is rotated by electromagnetic interaction with the rotor 35. The electrons 35 are rotated at high speed.

In this case, the rotating shaft 41 of the driving unit 3 rotates at high speed, and the orbiting scroll 53 of the compression unit 5 coupled with the rotating shaft 41 rotates at high speed in synchronization.

In addition, the refrigerant of the outer circumferential scroll fluidly connected from the driving unit to the compression unit 5 by the interaction with the orbiting scroll 53 and the fixed scroll 55 matched in a state facing the high pressure compression of the scroll to the center of the scroll to the refrigerant line. Will be discharged.

The driving unit 3 provided in the conventional electric compressor operated as described above is a driving source for generating rotational power of the electric compressor 10 for refrigerant compression, and the stator 33 is provided with a rotor 35 mounted coaxially. Corresponds to the driving part that creates the rotational driving force.

The stator 33 is composed of a stator core 37 that is fixedly mounted on the inner circumferential surface of the driving unit housing 30 by press-fitting or the like, and a winding coil 38 wound around the stator core 37.

The stator core 37 is a hollow cylindrical member as shown, and a through hole through which the rotor 35 is inserted is formed on a central axis, and a plurality of ribs protrude radially inward on the inner circumferential surface of the stator core 37. It is arranged at regular intervals in the circumferential direction. The ribs extend in the axial direction of the stator core 37 to wind the winding coil 38, and positioning grooves (not shown) are formed at predetermined intervals in the circumferential direction.

The conventional stator 33 has a problem in that the cooling effect of the winding coil 38 decreases as the positioning groove (not shown) is in close contact with the inner end of the flow path after being pressed into the housing 30 of the driving unit. .

In this case, the winding coil 38 may not be stably cooled, and thus a malfunction of the electric compressor due to overheating may occur, and thus a countermeasure is needed.

The present invention was devised to solve the above-mentioned problems, and matched the position defect groove formed in the stator and the flow path formed inside the driving unit housing, and improved the shape of the flow path to improve the cooling of the winding coil. It is intended to provide a compressor.

The present invention for achieving the above object is inserted into the interior of the drive unit housing 300 to generate a rotational driving force for refrigerant compression, extends in the axial direction on the outer edge in the circumferential direction, and is spaced apart from each other by a predetermined distance. A driving part 3 including a stator core 370 formed with a positioning groove 370a and a winding coil 380 wound on the stator core 370; And a compression unit 5 for compressing the refrigerant introduced through the driving unit 3 by the rotational driving force generated by the driving unit 3, wherein the stator core 370 is inserted into the driving unit housing 300. When possible, a flow path 340 through which the refrigerant moves is formed at a position corresponding to the positioning groove 370a.

The flow path 340 includes a central flow path 342 positioned at the bottom of the driving unit housing 300 when viewed from the front, based on the direction of gravity; A side channel 344 spaced apart from the inner circumferential direction of the driving unit housing 300 based on the center channel 342, wherein the center channel 342 extends longer in the width direction than the side channel 344 Is formed,

The side channel 344 is disposed symmetrically to the left and right when looking at the driving unit housing 300 from the front.

The central flow path 342 has a relatively deep radial depth of the side flow path 344 when the driving unit housing 300 is viewed from the front.

The positioning groove 370a is located in the center of the width direction of the central flow path 342 and the side flow path 344.

The central flow path 342 and the side flow path 344 communicate with the inner bottom surface 304 of the driving unit housing 300.

The driving unit housing 300 is formed with a refrigerant inlet 302 that is opened for movement of the refrigerant, and the refrigerant inlet 302 is disposed in communication with any one of the side flow paths 344.

The side channel 344 is located on the same axis as the refrigerant intake 302 opened in the driving unit housing 300.

The flow path 340 increases in width W1 as it moves away from the refrigerant inlet 302 based on the axial direction of the driving unit housing 300.

The depth dl in the radial direction of the drive unit housing 300 increases as the flow path 340 moves away from the refrigerant suction port 302.

The side channel 344 extends obliquely toward the refrigerant intake 302 based on the axial direction of the driving unit housing 300.

The unevenness 346 is formed in the flow path 340 to increase the contact surface with the refrigerant and improve the direction of movement.

The irregularities 346 are spaced at different intervals in the width direction.

The unevenness 346 may include a first unevenness 346a formed in the center of the flow path 340 in the width direction; It includes a second concavo-convex (346b) formed on both sides of the flow path 340 in the width direction.

The second unevenness 346b is characterized in that the spacing between the first unevenness 346a is shorter.

In the motor-driven compressor according to the present embodiment, when the stator core is inserted into the driving unit housing, the positioning groove is eccentric to one side and is not positioned, so that the winding coil can be stably cooled.

Embodiments of the present invention can change the internal shape and arrangement of the flow path in order to improve the cooling effect of the winding coil, so as to simultaneously promote the diffusion and movement speed of the refrigerant.

1 is a sectional view showing a conventional electric compressor.

Figure 2 is a perspective view showing a stator provided in the electric compressor according to an embodiment of the present invention.

3 is a plan view of FIG. 2;

Figure 4 is a cross-sectional view showing an electric compressor according to an embodiment of the present invention.

5 is a view showing a state in which the stator core is inserted into the drive unit housing of the present invention.

6 is a view showing a flow path formed in the drive unit housing of the present invention.

7 is a perspective view showing a central flow path according to an embodiment of the present invention.

8 is a view showing a side channel according to an embodiment of the present invention.

9 is a perspective view showing a state in which irregularities are formed in a central flow path according to another embodiment of the present invention.

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. The thickness of the lines or the size of components shown in the accompanying drawings may be exaggerated for clarity and convenience.

In addition, terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to a user or operator's intention or precedent. Therefore, definitions of these terms should be made based on the contents throughout this specification.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. For reference, FIG. 2 is a perspective view showing a stator provided in an electric compressor according to an embodiment of the present invention, FIG. 3 is a plan view of FIG. 2, and FIG. 4 is an electric compressor according to an embodiment of the present invention 5 is a view showing a state in which the stator core is inserted into the drive unit housing of the present invention, and FIG. 6 is a view showing a flow path formed in the drive unit housing of the present invention.

2 to 6, the electric compressor 1 according to the present embodiment is inserted into the interior of the drive unit housing 300 to generate a rotational driving force for compressing refrigerant, and is axially circumferentially circumferential on the outer edge. A driving part 3 including a stator core 370 extending toward each other and spaced apart from each other at predetermined intervals, and a winding coil 380 wound on the stator core 370; And a compression unit 5 for compressing the refrigerant introduced through the driving unit 3 by the rotational driving force generated by the driving unit 3.

The driving unit 3 is located in the center of the electric compressor 1, the compression unit 5 is located on the left side (based on the drawing) of the driving unit 3, and the control unit 7 is located on the right side (based on the drawing). Is located.

The control unit 7 is electrically connected to the stator 330 of the driving unit 3 to control the operation of the driving unit 3.

The driving unit 3 is provided with a driving unit housing 300 forming an outer shape, and when a stator core 370 is inserted into the driving unit housing 300, refrigerant is located at a position corresponding to the positioning groove 370a. A moving flow path 340 is formed, and the flow path 340 is located on the same axis as the refrigerant suction port 302 opened in the driving unit housing 300.

The driving part housing 300 is a part forming the outer shape of the driving part 3 and is generally formed in a cylindrical shape. The rotor 350 is coaxially coupled to the stator 330 and the rotation shaft is coupled.

The rotating shaft 410 is provided with a rotor core 430 on the outside, and the rotor 350 is driven by interaction with the stator 330 by the driving principle of the motor when the stator 330 is excited. This is done.

Since the

bearings

230 and 240 are installed on the rotating shaft 410 for stable support according to the rotation of the shaft at the leading and trailing ends, the rotating shaft 410 may be rotated at a high speed inside the driving unit housing 300.

The compression part 5 is a part that compresses the refrigerant by rotating by the rotational driving force generated by the driving part 3, and is connected to the front end of the rotation shaft 410 of the driving part 3.

The compression part 5 is in a state facing each other with the compression part housing 510 forming an outer shape, the orbiting scroll 530 rotatably mounted inside the compression part housing 510, and the orbiting scroll 530. It comprises a fixed scroll 550 coupled to.

The compression unit housing 510 is a cylindrical body opened toward the driving unit 3 and forms an outer body of the compression unit 5. The rear housing 570 is provided with a gas-liquid separator 610 to separate the refrigerant into a gaseous phase and a liquid phase, and is configured to discharge the compressed gaseous refrigerant through the discharge port 590 opened on one side.

The orbiting scroll 530 is provided with an orbiting scroll wrap 690 extending in a spiral shape toward the center protruding from the rear, so that the eccentric shaft 670 of the driving unit 3 rotation axis 410 is located at the central portion of the orbiting scroll wrap 690. ) Is coupled to rotate in synchronization with the rotor 350 around the rotation shaft 410.

When the orbiting scroll 530 is rotated by the rotating shaft 410, the orbiting and fixed scroll wrap from the driving unit 3 is fixed by the interaction of the orbiting and fixed scroll wraps 690 and 700. The refrigerant sucked into the outer edges of 690 and 700 is compressed to the center, and then discharged to the rear housing 570 through the discharge port 730.

The control unit 7 is a part that controls the operation of the driving unit 3, and is mounted on the driving unit housing 300 by the cover housing 750 while mounted on the PCB 780.

The control unit 7 rotates or stops the rotor 350 by exciting or demagnetizing the stator 330 by a current supplied from an external power source.

The terminal assembly 390 consists of a female terminal housing 400 and a male terminal plug 420 to fit into a male and female form. The terminal housing 400 and the terminal plug 420 mesh between the three-phase terminals 440 connected to the ends of each of the three-phase winding coils drawn from the UVW three-phase winding coil 380 of the stator 330 to each other. Is installed.

Each three-phase terminal 440 is interposed between the terminal housing 400 and the terminal plug 420 in a state where the terminal housing 400 and the terminal plug 420 are coupled, and each coupled to the terminal plug 420. The corresponding connector pin 460 is connected.

The stator core 370 is formed with a positioning groove 370a extending in an axial direction at an outer edge in a circumferential direction and spaced apart from each other at a predetermined distance. The positioning groove 370a serves to easily adjust the position of the stator 33 by being located in a section of a flow path formed in the inner circumferential direction of the driving unit housing 30.

The stator 330 according to the present embodiment is the width of the central flow path 342 and the side flow path 344 without pressing the positioning groove 370a to the inner end of the flow path after being pressed into the driving part housing 300 Because it is located in the center of the refrigerant is moved stably without clogging in the left and right positions of the positioning groove (37a).

In this case, since the phenomenon that the positional defect groove 370a is sealed on the inner surface of the driving unit housing 300 does not occur, the cooling effect of the winding coil 380 is improved, and the winding coil 38 is stably cooled so that overheating is achieved. The malfunction of the electric compressor caused does not occur.

In this embodiment, when the stator core 370 is inserted into the driving unit housing 300, a flow path 340 through which the refrigerant moves in a position corresponding to the positioning groove 370a is formed.

The positioning groove 370a is positioned at the center of the central flow path 342 and the side flow path 344 in the width direction, and when a worker inserts the stator core 370 into the driving unit housing 300, the positioning groove ( Since 370a) is not eccentrically located in either the central flow path 342 or the side flow path 344, accurate mounting can be achieved.

Since the positioning groove 370a is not located at one end with respect to the width direction of the central flow path 342 and the side flow path 344, a stable heat exchange is performed with a low-temperature refrigerant when the refrigerant moves along the flow path 340. .

Therefore, the winding coil 380 can improve cooling efficiency and prevent problems due to overheating.

In this embodiment, a flow path 340 is formed inside the drive unit housing 300, and the flow path 340 is a central flow path located at the bottom of the driving unit housing 300 based on the direction of gravity when looking from the front. 342 and a side channel 344 spaced apart from the inner circumferential direction of the driving unit housing 300 based on the central channel 342.

The central flow path 342 has a longer length in the width direction than the side flow path 344. The central flow path 342 corresponds to a lower side in the weight direction when the electric compressor 1 is installed in the vehicle, and corresponds to a position where the refrigerant and the oil contained in the refrigerant are relatively more concentrated than the side flow path 344.

The central flow path 342 extends relatively longer in the width direction than the side flow path 344 so that a large amount of refrigerant is stably moved, so the winding coil 380 according to heat exchange with the positioning groove 370a Its cooling efficiency is improved.

In addition, the central flow path 342 has a relatively deep radial depth when viewed from the front of the driving unit housing 300, thereby securing an area in which heat exchanges with a larger amount of refrigerant are obtained, and is more effective in diffusion of refrigerant due to movement. It becomes advantageous.

The side channel 344 is disposed symmetrically when viewed from the front of the driving unit housing 300 from the front, so the cooling efficiency of the winding coil 380 wound on the stator core 370 is not concentrated at a specific position and is uniformly Since it is maintained, stable cooling can be achieved.

Since the central flow path 342 and the side flow path 344 communicate with the inner bottom surface 304 of the driving unit housing 300, the refrigerant primarily exchanges heat with the area corresponding to the inner bottom surface 304, , Cooling due to heat exchange is secondary while moving along the central flow path 342 and the side flow path 344.

The driving unit housing 300 is formed with a refrigerant inlet 302 that is opened for movement of the refrigerant, and the refrigerant inlet 302 is disposed in communication with any one of the side flow paths 344. Here, the meaning of communication means a state in which adjacent refrigerants are disposed in a state in which they can move.

The side flow path 344 is located on the same axis as the refrigerant intake 302 opened in the driving unit housing 300, thereby enabling stable movement of the refrigerant.

When the refrigerant inlet 302 is located on the same axis as the side passage 344, the refrigerant flows directly toward the refrigerant inlet 302 after moving along the extended movement path of the side passage 344 The copper wire according to the movement is shortened and the stable movement of the refrigerant can be simultaneously achieved.

Referring to FIG. 7, the flow path 340 according to the present embodiment increases in width W1 as it moves away from the refrigerant inlet 302 based on the axial direction of the driving unit housing 300. The width W1 corresponds to a circumferential length of the central flow path 342 and the side flow path 344 when the driving unit housing 300 is viewed from the front. For reference, the front end corresponds to the front side when the driving unit housing 300 is viewed from the front, and the rear end corresponds to the position where the refrigerant intake 302 is formed.

As an example, the side channel 344 increases the width W1 toward the front end as compared with the width W2 of the rear end portion adjacent to the refrigerant inlet 302, thereby inducing the diffusion of the refrigerant, thereby improving the heat exchange efficiency of the winding coil 380. Since it can be improved, the cooling performance of the winding coil 380 can be improved.

The side passage 344 of the passage 340 is closer to the position corresponding to the front end than the radial depth d2 of the driving housing 300 at the rear end adjacent to the refrigerant suction port 302, so that the driving passage housing 300 The depth d1 in the radial direction is increased.

The increase in the depth d1 is advantageous in improving the cooling performance of the winding coil 380 due to diffusion and contact area increase due to the movement of the refrigerant when the refrigerant moves to the side channel 344.

For reference, the central flow path 342 may also be configured with the same structure as the side flow path 344, and the width W1 may be changed.

Referring to the attached FIG. 8, the side passage 344 extends obliquely toward the upper upper direction and the lower lower direction based on the drawing as it goes toward the refrigerant inlet 302 based on the axial direction of the driving unit housing 300. Although the inclined angle is not limited, it is possible to increase the mobility of the refrigerant by being obliquely extended to the side channel 344 located on the side of the electric compressor 1 for improving the moving speed and stability of the refrigerant.

In this case, the heat exchange efficiency in the side channel 344 is improved due to the diffusion effect and the contact area increase due to the movement of the refrigerant along with the above-described change in width and depth.

Referring to the attached FIG. 9, in the present embodiment, the concave-convex 346 is formed in the flow path 340 toward the refrigerant inlet 302 so as to increase the contact surface with the refrigerant and improve movement safety.

The unevenness 346 may be any of a polygonal or circular cross-sectional shape or a mixed shape, and is not particularly limited to a specific shape.

The unevenness 346 imparts directionality when the refrigerant is moved, and increases the heat exchange efficiency by increasing the contact area, thereby improving the cooling efficiency of the winding coil 380.

The unevenness 346 maintains directionality in one direction in the flow path 340 and the extended path has a straightness in one direction, thereby reducing unnecessary flow due to the movement of the refrigerant and stably moving toward the intended position.

The unevenness 346 includes a first unevenness 346a formed at the center of the flow path 340 in the width direction and a second unevenness 346b formed at both right and left sides of the flow path 340.

For example, assuming that the unevenness 346 is formed in both the central flow path 342 and the side flow path 344, the second unevenness 346b is shorter than each other in the width direction than the first unevenness 346a. .

For example, when the unevenness 346 is formed in the side passage 344, the moving speed of the refrigerant in the place where the first unevenness 346a and the second unevenness 346b are formed is different from each other. Particularly, since the movement speed of the refrigerant in the position where the second unevenness 346b is formed is slower due to resistance than the position where the first unevenness 346a is formed, the separation interval of the second unevenness 346b is shortened to prevent speed reduction. And, it is possible to improve the moving speed of the refrigerant through a reduction in resistance.

In the position where the first unevenness 346a is formed, the speed drop is reduced by the width W1 compared to the position where the second unevenness 346b is formed, so that the spacing is wide.

Therefore, the coolant can promote stable movement of the coolant regardless of the position of the flow path 340, and a phenomenon in which turbulence occurs at a specific position is prevented, so that the heat exchange efficiency of the winding coil 380 is kept constant.

For reference, the unevenness 346 may be formed in both the central flow path 342 and the side flow path 344, and it may also be formed in only one of the central flow path 342 or the side flow path 344. In particular, the unevenness 346 may be possible to confirm where the movement of the refrigerant is unstable through experiments in advance and to form only at the corresponding position.

One embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of rights of the present invention is limited only by the items described in the claims, and a person having ordinary knowledge in the technical field of the present invention can improve and change the technical spirit of the present invention in various forms. Therefore, as long as these improvements and modifications are apparent to those skilled in the art, they will fall within the scope of the present invention.

The present exemplary embodiments may provide an electric compressor capable of stably cooling the winding coil provided in the compressor.

Claims

Stator cores inserted into the inside of the drive unit housing to generate a rotational driving force for refrigerant compression, extending in the axial direction on the outer circumferential edge, and formed in the positioning grooves spaced apart from each other by a predetermined distance, to the stator core A driving unit including a wound coil; And

A compression unit for compressing the refrigerant flowing through the driving unit by the rotational driving force generated in the driving unit,

When the stator core is inserted into the driving part housing, an electric compressor having a flow path through which a refrigerant moves in a position corresponding to the positioning groove is formed.
According to claim 1,

The flow path may include a central flow path positioned at the bottom of the driving unit housing based on the direction of gravity when viewed from the front;

It includes a side flow path spaced apart from the inner circumferential direction of the drive housing relative to the center flow path,

The central flow path is an electric compressor characterized in that the length in the width direction is extended longer than the side flow path.
According to claim 2,

The side passage is a motor-driven compressor arranged symmetrically left and right when viewed from the front.
According to claim 2,

The central flow path is an electric compressor in which a radial depth of the side flow path is relatively deep when viewed from the front.
According to claim 2,

The positioning groove is an electric compressor located in the center of the width direction of the central flow path and the side flow path.
According to claim 2,

The central flow path and the side flow path are electric compressors in communication with the inner bottom surface of the drive housing.
According to claim 2,

The drive unit housing is formed with a refrigerant inlet opening for the movement of the refrigerant, the refrigerant inlet is an electric compressor disposed in communication with any one of the side passages.
According to claim 2,

The side passage is an electric compressor positioned on the same axis as the refrigerant intake opening in the drive housing.
According to claim 2,

The flow path is an electric compressor that increases in width (W1) as it moves away from the refrigerant suction port based on the axial direction of the drive unit housing.
According to claim 2,

The flow path is an electric compressor in which the depth d1 in the radial direction of the drive unit housing increases as it moves away from the refrigerant intake.
According to claim 2,

The side passage is an electric compressor extending obliquely toward the refrigerant intake port based on the axial direction of the drive unit housing.
According to claim 2,

An electric compressor having irregularities formed in the flow path to increase the contact surface with the refrigerant and improve the direction of movement.
The method of claim 12,

The unevenness is an electric compressor spaced apart at different intervals in the width direction.
The method of claim 12,

The unevenness may include a first unevenness formed in the center of the width direction of the passage;

An electric compressor including second irregularities formed on both sides in the width direction of the flow path.
The method of claim 14,

The second concavo-convex is a motor-driven compressor having a shorter spacing than the first concavo-convex.