KR20200122920A - Electric compressor with improved heat dissipation efficiency - Google Patents

Abstract

Disclosed is an electronic compressor with improved heat dissipation efficiency of an inverter unit. According to the present invention, the electronic compressor comprises a heat dissipation structure for dissipating heat generated from the inverter unit. The heat dissipation structure comprises: a heat dissipation cap contacting with an inverter device; and a heat dissipation boss unit configured to be inserted into the heat dissipation cap to be in contact with the heat dissipation cap. The heat dissipation boss unit protrudes from one side surface of a heat dissipation plate. The other side surface of the heat dissipation plate is coupled to a main housing to be in contact with a refrigerant. The heat dissipation boss unit is formed of a material having a higher thermal expansion coefficient than the material of the heat dissipation cap. When heat generated from the inverter device is transmitted, the heat dissipation boss unit is expanded to increase a contact surface with the heat dissipation cap. Therefore, the heat generated from the inverter device is effectively dissipated in accordance with operation of the electronic compressor.

Description

Electric compressor with improved heat dissipation efficiency}

The present invention relates to an electric compressor, and more particularly, to an electric compressor having a structure capable of effectively dissipating heat generated from an inverter device.

Compressors that compress refrigerants in vehicle air conditioning systems have been developed in various forms. In recent years, according to the trend of electrification of automobile parts, the development of electric compressors driven by electricity using a motor has been actively made.

A scroll compression method suitable for high-compression ratio operation is mainly applied to an electric compressor. Such a scroll type electric compressor (hereinafter referred to as "electric compressor") is composed of an electric unit, a compression unit, and a rotating shaft connecting the electric unit and the compression unit.

Specifically, the electric unit is provided with a rotary motor or the like and installed inside a sealed casing. The compression unit is located on one side of the electric unit, and consists of a fixed scroll and an orbiting scroll. The rotation shaft is configured to transmit the rotational force of the electric unit to the compression unit.

The refrigerant compressed in the compression unit is discharged to the outside of the electric compressor through an exhaust port. The discharged refrigerant is utilized to operate the vehicle air conditioning system.

On the other hand, the electric unit is controlled by an inverter device. The inverter device is configured to receive power and control signals from outside. Power and control signals applied to the inverter device are transmitted to the electric unit through electrical processing.

Whether or not the electric unit is operated can be controlled by the power applied from the inverter device. In addition, the rotational speed and rotation direction of the electric unit may be controlled by a control signal applied from the inverter device. As the electric unit is controlled, a rotational force is generated, and the compression unit is rotated by this rotational force to compress the refrigerant.

The inverter device includes a number of heating elements that generate heat during operation. Therefore, as the operation of the electric compressor proceeds, a lot of heat is generated in the inverter device.

However, it is common that heat-generating elements provided in the inverter device have poor heat resistance. Therefore, there is a high possibility that the heating elements are damaged by heat generated from the inverter device. Accordingly, the inverter device is provided with a heat radiating member for cooling the heating elements.

The heat dissipating member directly contacts the heating element and receives heat generated from the heating element. The heat received by the heat dissipating member is transferred to a refrigerant flowing through a housing in which the inverter device is accommodated or a main housing configured to be in contact with the housing. As a result, the heating element can be cooled by the refrigerant.

However, as described above, when the refrigerant directly cools the heating element, there is a concern that the inherent compression efficiency of the electric compressor, which is the compression of the refrigerant, is deteriorated.

In the case of a heating element, especially an Insulated Gate Bipolar Transitor (IGBT), characteristics such as an allowable current value are determined according to the temperature. In general, power semiconductors have high allowable current values at low temperatures.

That is, as the power semiconductor is maintained at a lower temperature, the performance of the power semiconductor can be improved.

Of course, power semiconductors that can exhibit high performance even at high temperatures have been developed. However, since such a high-performance power semiconductor is very expensive, it causes an increase in prices of inverters, compressors, and even vehicles equipped with compressors.

Therefore, a method for effectively cooling the heating element is required.

In order to effectively cool the heating element, it is most effective to increase the contact area between the heating element and the refrigerant for heat exchange. However, it is difficult to increase the size of the heat dissipating member indefinitely, considering the size of the housing in which the inverter device is accommodated, and furthermore the electric compressor.

Korean Patent Publication No. 10-2015-0033060 discloses an electric compressor inverter including a capacitor heat dissipation device. Specifically, disclosed is an electric compressor inverter having a structure in which heat from the capacitor can be transferred to the heat dissipation unit by providing a plurality of heat dissipation units contacting one side of the capacitor in the inverter housing.

However, this type of electric compressor inverter has a limitation in that it focuses only on heat dissipation of a capacitor among various devices provided in the inverter device. In addition, since it is disposed on the surface of the inverter housing manufactured in a small size, there is a space limitation for the heat dissipation device to be provided.

Korean Patent Publication No. 10-2011-0104725 discloses an electric compressor for a vehicle having a structure capable of cooling an inverter using oil. Specifically, an electric compressor for a vehicle having a structure in which the inverter is cooled by oil is disclosed by arranging the oil flow formed in the interior of the housing adjacent to the inverter.

However, since the electric compressor of this structure needs to change the arrangement method of the inverter, there is a limitation that a redesign of the entire structure of the electric compressor is required. That is, for cooling the inverter device, there is a hassle of redesigning the entire electric compressor.

In addition, although the inverter may be cooled through heat exchange with oil, the temperature of the oil may increase as heat from the inverter is transferred to the oil. Accordingly, when the viscosity of the oil is changed, there is a problem that it becomes difficult to achieve the original purpose of supplying oil such as lubrication of the electric compressor.

Korean Patent Publication No. 10-2015-0033060 (2015.04.01.) Korean Patent Publication No. 10-2011-0104725 (2011.09.23.)

An object of the present invention is to provide an electric compressor having a structure capable of solving the above-described problems.

First, an object of the present invention is to provide an electric compressor having a structure capable of effectively cooling heat generated from an inverter device.

In addition, an object of the present invention is to provide an electric compressor having a structure in which an inverter device can be effectively cooled without a refrigerant directly cooling the inverter.

In addition, it is an object of the present invention to provide an electric compressor having a structure in which a heat dissipation effect can be improved correspondingly when a large amount of heat is generated as heat is generated in the inverter device.

In addition, an object of the present invention is to provide an electric compressor having a structure capable of improving heat dissipation efficiency of the inverter device without significantly changing the structure of the inverter device and the electric compressor.

In addition, it is an object of the present invention to provide an electric compressor having a structure in which heat dissipation means for dissipating an inverter device are easily coupled.

In addition, an object of the present invention is to provide an electric compressor having a structure in which a contact area between heat dissipating members can be increased.

In addition, for heat dissipation of an inverter device, an object of the present invention is to provide an electric compressor having a structure in which an additional contact can be formed between each heat dissipating member.

In order to achieve the above object, the present invention includes a main housing having a motor chamber in which the motor unit is accommodated; An inverter unit located on one side of the main housing and accommodating an inverter element configured to control the motor unit therein; A heat dissipation plate positioned between the main housing and the inverter part and having a heat dissipation boss part protruding from one side facing the inverter part; And a heat dissipation cap configured to at least partially surround the heat dissipation boss portion, wherein the inverter element contacts the heat dissipation cap so that generated heat is transferred to the heat dissipation cap.

In addition, the heat dissipation boss portion of the electric compressor may be formed of a material having a greater coefficient of thermal expansion than the material of the heat dissipation cap.

In addition, the radiating boss portion of the electric compressor may be formed of aluminum (Al), and the radiating cap may be formed of iron (Fe).

In addition, the heat dissipation cap may be configured to contact the heat dissipation boss part so that heat transferred to the heat dissipation cap of the electric compressor is transferred to the heat dissipation boss part.

In addition, the heat dissipation boss portion of the electric compressor may include a first contact surface in contact with the heat dissipation cap; And a second contact surface extending from the first contact surface at a predetermined angle with the first contact surface, wherein the heat dissipation cap includes: a first inner surface in contact with the first contact surface of the heat dissipation boss portion; A second inner surface formed at a predetermined angle with the first inner surface, extending from the first inner surface, and spaced apart from the second contact surface of the heat dissipation boss part by a predetermined distance.

In addition, when the heat dissipation boss part is thermally expanded by heat transmitted from the heat dissipation cap of the electric compressor, the second contact surface of the heat dissipation boss part and the second inner surface of the heat dissipation cap may be in contact with each other.

Further, in the second contact surface of the heat dissipation boss part of the electric compressor, the second contact surface is recessed; And a cap concave portion in which convex portions protruding from the second contact surface are alternately formed, and in the second inner surface of the heat dissipation cap, the second inner surface is recessed. And when the cap convex portions protruding from the second inner surface are alternately formed so that the heat dissipation boss portion is expanded by the heat transferred from the heat dissipation cap, the concave portion of the radiating boss portion and the cap convex portion of the second inner surface And the convex portion of the heat dissipation boss portion and the cap concave portion of the second inner surface may be aligned.

In addition, on the second contact surface of the heat dissipation boss part of the electric compressor, a plurality of protrusions configured to be spaced apart from each other by a predetermined distance are formed to protrude from the second contact surface, and the second inner surface of the heat dissipation cap is spaced a predetermined distance from each other. When the plurality of cap protrusions are formed to protrude from the second inner surface and the heat dissipation boss part is expanded by the heat transmitted from the heat dissipation cap, the protrusion of the heat dissipation boss part is in the space between the cap protrusions of the heat dissipation cap And the cap protrusion of the heat dissipation cap may be configured to be inserted into a space between the protrusions of the heat dissipation boss part.

In addition, the second contact surface of the heat dissipation boss portion of the electric compressor is configured to be spaced apart from each other by a predetermined distance, and a plurality of tooth-like protrusions having a tip formed at an end portion are formed to protrude from the second contact surface, and the second The inner surface is configured to be spaced apart from each other by a predetermined distance, and when a plurality of cap tooth-like protrusions having a cap tip formed at an end thereof protrude from the second inner surface, and the heat dissipation boss part is expanded by heat transferred from the heat dissipation cap, the heat dissipation boss The toothed protrusion of the portion may be inserted into a space between the cap toothed protrusions of the heat dissipating cap, and the cap toothed protrusion of the heat dissipating cap may be configured to be inserted into a space between the toothed protrusions of the heat dissipating boss part.

In addition, the electric compressor includes a coupling pin configured to couple the heat dissipation cap to the heat dissipation boss part, and the heat dissipation boss part is recessed along the protruding direction of the heat dissipation boss part, so that the coupling pin is at least partially It includes a pin insertion portion to be inserted, the heat dissipation cap may include a pin coupling portion formed through the height direction of the heat dissipation cap, and through which the coupling pin is coupled.

In addition, the electric compressor may include an outer circumferential radiating part protruding from the radiating plate and spaced apart from the radiating cap by a predetermined distance to surround the radiating cap.

In addition, the heat dissipation cap of the electric compressor forms an outer surface of the heat dissipation cap, and includes an outer circumferential surface facing the outer circumferential heat dissipation part, and the outer circumferential heat dissipation part forms an inner surface of the outer heat dissipation part, It may include a facing contact inner peripheral surface.

In addition, when the heat dissipation boss part is thermally expanded by heat transmitted from the heat dissipation cap of the electric compressor, the second contact surface of the heat dissipation boss part and the second inner surface of the heat dissipation cap may be in contact with each other.

In addition, when the outer heat radiating portion is thermally expanded by the heat transferred from the heat radiating cap of the electric compressor, the contact inner peripheral surface of the outer heat radiating portion and the outer peripheral surface of the heat radiating cap may be in contact with each other.

In addition, the outer circumferential radiating part of the electric compressor may be formed of a material having a greater coefficient of thermal expansion than that of the radiating cap.

According to the present invention, the following effects can be achieved.

First, the inverter device is in contact with the heat dissipation cap, and the heat dissipation cap is configured to contact the heat dissipation boss portion of the heat dissipation plate.

Therefore, heat generated in the inverter device can be effectively dissipated by heat conduction.

Further, the heat generated by the inverter device is configured to be radiated by the heat dissipation cap and the heat dissipation contact portion in contact with the inverter device.

Thus, the inverter device can be effectively cooled even if the refrigerant does not directly cool the inverter device.

In addition, the heat dissipation cap and the heat dissipation boss portion are formed of materials having different coefficients of thermal expansion. The heat dissipation boss portion is formed of a material having a greater coefficient of thermal expansion than the heat dissipation cap. When heat generated from the inverter element is conducted, the heat radiation boss portion expands before the heat radiation cap and contacts the heat radiation cap.

Accordingly, since the contact area between the heat dissipation cap and the heat dissipation boss is increased, the heat dissipation effect may also be improved as the temperature of the inverter element increases.

In addition, a heat dissipation plate for cooling the inverter device is located between the main housing and the inverter unit. The heat dissipation cap is located inside the inverter unit accommodating the inverter device.

Accordingly, the heat dissipation efficiency of the inverter device can be improved without significantly changing the structure of the inverter unit and the electric compressor.

In addition, the inverter device is in surface contact with the heat dissipation cap, and the heat dissipation boss portion is inserted into the heat dissipation cap. In addition, the heat dissipation cap and the heat dissipation boss portion are fastened by a coupling pin.

Accordingly, coupling between the heat radiation cap and the heat radiation boss portion may be facilitated.

Further, a wave portion, an uneven portion, or a toothed portion is formed on a surface where the heat radiation cap and the heat radiation boss portion contact. Accordingly, a contact area between the heat dissipation cap and the heat dissipation boss may be increased.

Accordingly, the contact area between the heat dissipating members is increased, so that the heat conduction effect can be improved.

In addition, an outer circumferential radiating portion formed to surround the radiating cap may be formed to protrude from the radiating plate. The outer circumferential heat dissipation part is formed of a material having a greater coefficient of thermal expansion than the heat dissipation cap.

Accordingly, when heat is generated in the inverter device, the heat dissipation cap may contact not only the heat dissipation boss part but also the outer heat dissipation part. Accordingly, since the contact area for heat dissipation is increased, the heat dissipation effect may be improved.

1 is a perspective view of an electric compressor according to an embodiment of the present invention.
2 is an exploded perspective view of the electric compressor of FIG. 1.
3 is a cross-sectional view of the electric compressor of FIG. 1.
4 is an exploded perspective view of an inverter part provided in the electric compressor of FIG. 1.
5 is a combined perspective view showing a coupling relationship between a heat dissipating member and a heat dissipating plate according to an embodiment of the present invention.
6 is a perspective view (a) and a rear view (b) showing a state in which the heat radiation member and the heat radiation plate of FIG. 5 are combined.
7 is a schematic diagram illustrating a cross-section of a coupling relationship between a heat radiation member and a heat radiation plate according to an embodiment of the present invention.
8 is a schematic diagram showing a cross-section of a coupling relationship between a heat radiation member and a heat radiation plate according to another embodiment of the present invention.
9 is a schematic view showing a cross-section of a coupling relationship between a heat radiation member and a heat radiation plate according to another embodiment of the present invention.
10 is a schematic view showing a cross-section of a coupling relationship between a heat radiation member and a heat radiation plate according to another embodiment of the present invention.
11 is a schematic diagram showing a cross-section of a coupling relationship between an outer heat dissipation member and a heat dissipation plate according to an embodiment of the present invention.
12 is a schematic diagram showing a cross-section of a coupling relationship between an outer heat dissipating member and a heat dissipating plate according to another embodiment of the present invention.
13 is a schematic diagram showing a cross-section of a process in which the heat dissipation member of FIG. 7 is thermally expanded to contact the heat dissipating plate.
14 is a schematic diagram showing a cross-section of a process in which the heat dissipation member of FIG. 8 is thermally expanded to contact the heat dissipating plate.
15 is a schematic diagram showing a cross-section of a process in which the heat dissipation member of FIG. 9 is thermally expanded to contact the heat dissipating plate.
16 is a schematic diagram showing a cross-section of a process in which the heat dissipating member of FIG. 10 is thermally expanded to contact the heat dissipating plate.
17 is a schematic diagram illustrating a cross-section of a process in which the outer heat dissipating member and the heat dissipating member are thermally expanded and contacted with the heat dissipating plate according to the embodiment of FIG. 11.

Hereinafter, an electric compressor 10 according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the following description, descriptions of some components may be omitted in order to clarify the technical features of the present invention.

1. Definition of terms

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

Singular expressions used in the present specification include plural expressions unless the context clearly indicates otherwise.

The term "refrigerant" used in the following description refers to any medium that takes heat from a low-temperature object and transports it to a high-temperature object. In one embodiment, the refrigerant may be carbon dioxide (CO ₂ ), R134a, R1234yf, or the like.

The term "heat dissipating member" used in the following description refers to any member capable of receiving heat from a heating element using conduction, convection, and radiation, and discharging it to the outside.

The term "printed circuit board" (PCB) used in the following description means that electronic components such as integrated circuits, resistors, and capacitors are fixed to the surface of the printed wiring board, and the components are connected by wiring, etc. It means a substrate on which an electronic circuit is formed.

The term "inverter device" used in the following description refers to an electronic circuit device using a semiconductor. In one embodiment, the inverter element may be a switching element.

In one embodiment, the inverter element may refer to a component or device that is provided as a switching element and has a function of opening and closing a circuit without using a contact. In the above embodiment, the switching element is SIC (Silicon Carbide, hydrocarbon), GaN (Gallium Nitride, gallium nitride), IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), MOSFET (Matel-Oxide Semiconductor Field-Effect Transistor, metal Oxide semiconductor field effect transistor), and the like.

The terms "front side", "rear side", "upper side", "lower side", "right side" and "left side" used in the following description refer to the coordinate systems shown in FIGS. 1, 3, 4 and 5. It will be understood by reference.

2. Description of the electric compressor 10 according to the embodiment of the present invention

1 to 4, the electric compressor 10 according to an embodiment of the present invention includes a main housing 100, a rear housing 200, an inverter unit 300, a rotating shaft unit 400, and a motor unit 500. ), a compression unit 600 and a flow path unit 700.

In addition, the electric compressor 10 according to an embodiment of the present invention further includes a heat dissipation structure 800 for effectively dissipating heat generated from the inverter element 360 of the inverter unit 300.

Hereinafter, each configuration of the electric compressor 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4, but the heat dissipation structure 800 will be described as a separate paragraph.

(1) Description of the main housing 100

The main housing 100 forms a part of the exterior of the electric compressor 10. In addition, the main housing 100 forms a body portion of the electric compressor 10, and a space is formed therein so that a device provided in the electric compressor 10 may be accommodated therein.

Specifically, the rotation shaft part 400, the motor part 500, and the compression part 600 may be accommodated in the inner space of the main housing 100.

The main housing 100 is provided in a cylindrical shape that is elongated in the longitudinal direction and in the front-rear direction in the illustrated embodiment. The main housing 100 may have any shape capable of accommodating the device of the electric compressor 10 therein.

However, considering that the refrigerant introduced into the main housing 100 is compressed at high pressure, the main housing 100 is preferably formed in a cylindrical shape having a high pressure resistance.

A fixed scroll 620 of a compression part 600 to be described later is connected in fluid communication to one side of the main housing 100 in the longitudinal direction and a front side in the illustrated embodiment.

The refrigerant flowing into the main housing 100 is compressed in the compression unit 600 and then introduced into the discharge chamber S3 through the discharge port 628 formed in the fixed scroll 620.

An inverter unit 300, which will be described later, is connected to the other side in the longitudinal direction of the main housing 100 and at the rear side in the illustrated embodiment so as to be energized.

The power and control signals applied from the inverter unit 300 are transmitted to the motor unit 500, and the motor unit 500 is controlled so that the compression unit 600 generates a rotational force for compressing the refrigerant.

A heat radiation plate 810 of a heat radiation structure 800 to be described later is positioned between the main housing 100 and the inverter unit 300.

The heat dissipation plate 810 is configured to cool the inverter element 360 by transferring heat transferred from the inverter element 360 inside the inverter unit 300 to the refrigerant.

The main housing 100 includes a motor chamber 110, an intake port 120, and an Oldham ring 130.

The motor chamber 110 is a space in which the motor unit 500 is accommodated. The motor chamber 110 may be defined as a space inside the main housing 100.

The motor chamber 110 is partitioned by the inner surface of the main housing 100. That is, the motor chamber 110 is a space surrounded by the inner surface of the main housing 100.

When the motor unit 500 is accommodated in the motor chamber 110, the outer surface of the stator 510 of the motor unit 500 may be fixed to the inner surface of the main housing 100. Accordingly, even when power and control signals are applied from the inverter unit 300 to the motor unit 500, the stator 510 may not be rotated.

The intake port 120 communicates the inside and the outside of the main housing 100. The refrigerant may flow into the main housing 100 through the intake port 120. The introduced refrigerant passes through the motor chamber 110, the back pressure chamber (S2) and the discharge chamber (S3) in sequence, is compressed, and then discharged to the outside of the electric compressor 10 through an exhaust port 220 to be described later.

The intake port 120 is located on one side of the main housing 100 facing the fixed scroll 620 and the rear housing 200, and on an outer peripheral surface of the rear side of the main housing 100 in the illustrated embodiment.

In addition, the intake port 120 is formed as a circular through hole penetrating the outside and the inside of the main housing 100.

The position and shape of the intake port 120 may be determined as an arbitrary position and shape capable of communicating the inside and the outside of the main housing 100.

However, considering that a large amount of heat is generated from the inverter device accommodated in the inverter unit 300 to be described later, and that the refrigerant introduced into the main housing 100 serves to cool the generated heat, the intake port 120 is preferably located adjacent to the inverter unit 300.

The Oldham ring 130 is provided between the main housing 100 and the orbiting scroll 610 of the compression unit 600 to be described later.

The Oldham ring 130 prevents the orbiting scroll 610 from rotating. In addition, the Oldham ring 130 transmits the rotational force of the motor unit 500 transmitted by the rotation shaft unit 400 to be described later to the orbiting scroll 610.

To this end, the Oldham ring 130 is rotatably coupled to the rotating shaft portion 400 and the orbiting scroll 610, respectively. In other words, the Oldham ring 130 is fixedly coupled to the rotation shaft 400 and the orbiting scroll 610, respectively.

Therefore, when the motor unit 500 is operated, the Oldham ring 130, the rotary shaft unit 400, and the orbiting scroll 610 may be rotated as a unit.

As a result, the Oldham ring 130 allows the orbiting scroll 610 to be rotated only when the motor unit 500 is operated.

In an embodiment not shown, an anti-rotation mechanism (not shown) including a pin and a ring other than the Oldham ring 130 may be provided.

The Oldham ring 130 may be replaced with an arbitrary member configured to prevent rotation of the orbiting scroll 610 and rotate the rotation shaft part 400 and the orbiting scroll 610 as an integral part.

(2) Description of the rear housing 200

The rear housing 200 forms part of the external shape of the electric compressor 10. Specifically, the rear housing 200 is located on one side of the main housing 100, in the illustrated embodiment, on the front side of the main housing 100, and forms the outer shape of the electric compressor 10 together with the main housing 100 do.

Between the rear housing 200 and the main housing 100, a fixed scroll 620 of the compression unit 600 to be described later is positioned. That is, the main housing 100, the fixed scroll 620, and the rear housing 200 are sequentially connected in fluid communication.

Alternatively, the fixed scroll 620 may be configured to be accommodated in the main housing 100. In this case, the rear housing 200 may be directly connected to the main housing 100.

The rear housing 200 is configured to communicate with the main housing 100. The refrigerant flowing into the main housing 100 through the intake port 120 of the main housing 100 may be compressed in the compression unit 600 and then introduced into the rear housing 200.

In the illustrated embodiment, the rear housing 200 is provided in the shape of a cap having a circular cross section. The shape of the rear housing 200 may be changed, but it is preferable to change the shape corresponding to the shape of the main housing 100 and the shape of the fixed scroll 620.

The rear housing 200 includes a space 210, an exhaust port 220, and an oil discharge passage 230.

The space 210 is partitioned by recessing one side of the rear housing 200. Specifically, the space 210 is a portion in which one side of the rear housing 200 facing the fixed scroll 620 is recessed.

As described above, one side of the rear housing 200 and the rear side of the rear housing 200 in the illustrated embodiment are coupled to the fixed scroll 620 in fluid communication.

In this case, the discharge chamber S3 may be defined by the space 210 and one side of the fixed scroll 620 facing the rear housing 200. The discharge chamber S3 is defined as a space formed on the upper side of the space between the rear housing 200 and the fixed scroll 620.

The refrigerant compressed by the compression unit 600 flows into the discharge chamber S3. Specifically, a mixed fluid in which the oil supplied to the compression unit 600 and the compressed refrigerant are mixed is introduced into the discharge chamber S3.

The mixed fluid introduced into the discharge chamber S3 is discharged to the outside of the electric compressor 10 through the exhaust port 220 after the oil is separated. The separated oil may be resupplied to the compression unit 600 through an oil discharge passage 230 to be described later.

The exhaust port 220 is a passage through which the compressed refrigerant is discharged to the outside of the electric compressor 10. The exhaust port 220 communicates the inside and the outside of the rear housing 200. Specifically, the exhaust port 220 communicates with the outside of the rear housing 200 and the discharge chamber S3.

In one embodiment, the exhaust port 220 may be formed as a through hole.

In the illustrated embodiment, the exhaust port 220 is formed on the upper side of the rear housing 200. The location of the exhaust port 220 may be changed to any location capable of communicating the inside and the outside of the rear housing 200.

As described above, the main housing 100, the rear housing 200, and the compression unit 600 to be described later are connected to communicate with each other. Accordingly, the refrigerant introduced into the electric compressor 10 through the intake port 120 may be compressed by the compression unit 600 and then discharged to the outside of the electric compressor 10 through the exhaust port 220.

The oil discharge passage 230 is a passage through which oil separated from the mixed fluid is discharged from the discharge chamber S3.

The oil discharge passage 230 communicates the discharge chamber S3 and the exterior of the rear housing 200. Specifically, the oil discharge passage 230 communicates the discharge chamber S3 with an oil chamber (not shown) of the electric compressor.

The oil separated from the mixed fluid in the discharge chamber S3 is discharged through the oil discharge passage 230 and may be collected in the oil chamber (not shown).

The oil collected in the oil chamber (not shown) is supplied to the compression part 600 by the oil flow path part 720 of the flow path part 700 to be described later, and can be used as a lubricant for smooth rotation of the orbiting scroll 610. have.

In the illustrated embodiment, the oil discharge passage 230 is located under the rear housing 200. This is due to the fact that the oil separated from the mixed fluid falls downward due to the difference in density.

(3) Description of the inverter unit 300

The inverter unit 300 receives power and a control signal for driving the electric compressor 10, specifically the motor unit 500 to be described later, from the outside and applies it to the motor unit 500.

To this end, the inverter unit 300 may accommodate an inverter element 360 including an Insulated Gate Bipolar Transistor (IGBT) or the like in an internal space.

The inverter unit 300 is located on one side of the main housing 100. The inverter unit 300 is located on one side of the main housing 100 facing the rear housing 200, and on the rear side of the main housing 100 in the illustrated embodiment.

The inverter unit 300 may receive power and control signals from the outside, and may be disposed at any position that can be applied to the motor unit 500.

The inverter unit 300 is connected to the main housing 100 to be energized. By the above connection, the inverter unit 300 may apply power and control signals to the motor unit 500.

In an embodiment not shown, the inverter unit 300 and the main housing 100 may communicate with each other. In the above embodiment, the refrigerant introduced through the intake port 120 may directly cool the inverter element 360 accommodated in the inverter unit 300.

4, the inverter unit 300 includes an inverter housing 310, an inverter cover 320, a connector unit 330, a printed circuit board 340, an inverter bracket 350, and an inverter element 360. Include.

The inverter housing 310 forms an outer shape of the inverter unit 300 together with the inverter cover 320.

The front side of the inverter housing 310 is coupled to the main housing 100. In one embodiment, the inverter housing 310 may be connected in fluid communication with the main housing 100. In the above embodiment, the inverter element 360 may be directly cooled by the refrigerant introduced into the main housing 100.

The rear side of the inverter housing 310 is coupled to the inverter cover 320. A separate fastening member (not shown) may be provided for coupling with the inverter cover 320.

The inner space formed by combining the inverter housing 310 and the inverter cover 320 may be defined as an inverter chamber S1 in which the printed circuit board 340 and the inverter element 360 are accommodated.

A heat dissipation opening 312 is formed in the inverter housing 310. A heat radiation plate 810 to be described later is coupled to the heat radiation opening 312. The shape of the heat dissipation opening 312 may be determined so that the heat dissipation plate 810 is accurately aligned.

A connector part 330 to which power and control signals are applied from the outside is positioned on the upper side of the inverter housing 310.

The inverter cover 320 forms the outer shape of the inverter unit 300 together with the inverter housing 310. The inverter cover 320 is located on the rear side of the inverter housing 310. The inverter cover 320 is coupled to form a predetermined space between the inverter housings 310.

The inverter cover 320 may be coupled to the inverter housing 310 by a separate fastening means (not shown).

The connector unit 330 is a part to which power and control signals are input from the outside. The power and control signals applied to the connector unit 330 are transmitted to the motor unit 500, so that a rotational force for the electric compressor 10 to compress the refrigerant is generated.

In the illustrated embodiment, the connector part 330 is located above the front of the inverter housing 310. The connector unit 330 may be provided in an arbitrary position to receive power and control signals from the outside.

The connector unit 330 includes a communication connector 332 for receiving control signals and a power connector 334 for receiving power. Alternatively, the connector unit 330 may be provided as a single connector to which both power and control signals are applied.

A process in which power and control signals are applied to the inverter element 360 accommodated in the inverter chamber S1 through the connector unit 330 to control the motor unit 500 is a well-known technique, and thus a detailed description thereof will be omitted.

The printed circuit board 340 generates a control signal for controlling the motor unit 500 to be described later, and transmits the control signal to the motor unit 500. That is, the printed circuit board 340 can operate as an inverter.

Various electric and electronic components (not shown) for controlling the motor unit 500 may be connected to the printed circuit board 340 so as to be energized. That is, the connection pin 362 of the inverter element 360 to be described later is connected to the printed circuit board 340 so as to be energized.

To this end, a plurality of connection pin coupling holes (not shown) may be formed through the printed circuit board 340.

The inverter bracket 350 supports the printed circuit board 340 and the inverter element 360.

Specifically, one side of the inverter bracket 350, the rear side in the illustrated embodiment, stably couples the printed circuit board 340 to the inverter cover 320.

In addition, an inverter element coupling portion 352 to which the inverter element 360 is contact-coupled is provided on the other side of the inverter bracket 350 and the front side in the illustrated embodiment.

In order to couple the inverter element 360, a plurality of through holes (not shown) through which the connection pins 362 can be coupled may be formed in the inverter bracket 350.

The inverter bracket 350 is preferably made of a material having strong durability and good thermal conductivity.

The inverter element 360 applies or blocks a control signal or the like for the printed circuit board 340 to perform a function as an inverter. That is, the inverter element 360 substantially performs the role of the inverter unit 300 together with the printed circuit board 340.

One side of the inverter element 360 is in contact with the inverter element coupling portion 352 of the inverter bracket 350. In addition, the heat dissipation contact surface 364 positioned on the other side of the inverter element 360 is in contact with the heat dissipation cap 830 of the heat dissipation structure 800 to be described later (see FIG. 7 ).

The inverter element 360 is provided with a connection pin 362. The connection pin 362 connects the inverter element 360 and the printed circuit board 340 to enable electricity. The connection pin 362 may pass through the inverter bracket 350 and be connected to the printed circuit board 340.

One side surface of the inverter element 360 in contact with the heat radiation cap 830 to be described later may be defined as a heat radiation contact surface 364. The heat dissipation contact surface 364 is in contact with the element coupling surface 835 of the heat dissipation cap 830. Heat generated by the inverter device 360 may be transferred to the heat dissipation cap 830 by the contact. Accordingly, the inverter element 360 may be radiated.

A separate fastening member (not shown) may be provided to ensure contact between the inverter element 360 and the heat dissipation cap 830. In one embodiment, the fastening member (not shown) may be provided with a screw or the like.

(4) Description of the rotating shaft part 400

The rotating shaft part 400 transmits the rotational force generated by the rotation of the motor part 500 to the orbiting scroll 610.

To this end, one side of the rotation shaft part 400, the rear side in the illustrated embodiment, is coupled to the rotor 520 of the motor part 500. In addition, the other side of the rotation shaft 400, the front side in the illustrated embodiment is coupled to the orbiting scroll 610.

In the illustrated embodiment, the rotation shaft part 400 is provided in a cylindrical shape extending in the longitudinal direction, but the shape may be any shape capable of transmitting the rotational force of the motor part 500 to the compression part 600.

The rotating shaft part 400 includes a shaft part 410, a main bearing part 420, an eccentric part 430, a sub bearing part 440, and a lubrication guide flow path 450.

The shaft part 410 is rotatably coupled to the rotor 520 of the motor part 500. The shaft part 410 is located on one side of the rotation shaft part 400 adjacent to the rotor 520.

The main bearing part 420 is rotatably supported in a radial direction by a shaft coupling part (not shown) provided in the main housing 100. In other words, the main bearing part 420 is a part where the rotation shaft part 400 is coupled to the main housing 100.

To this end, the main bearing part 420 is formed to have a larger radius than the shaft part 410. In addition, the main bearing part 420 is located on one side of the shaft part 410 and a front side opposite to the rotor 520 in the illustrated embodiment.

A balance weight 422 is provided on the rear side of the main bearing part 420. The balance weight 422 adjusts the center of gravity of the rotation shaft part 400 so that the rotation shaft part 400 can be stably rotated according to the rotation of the motor part 500.

The eccentric portion 430 is rotatably coupled to the rotation shaft coupling portion 616 of the orbiting scroll 610 of the compression portion 600. The eccentric part 430 is formed to have a different central axis from the rotation shaft part 400. In other words, when the rotation shaft part 400 is rotated, the eccentric part 430 is rotated about an axis different from the central axis of the rotation shaft part 400.

Accordingly, the orbiting scroll 610 coupled to the eccentric portion 430 may also be rotated to be relatively eccentric with respect to the rotation of the motor unit 500. As a result, the refrigerant may be compressed in a space between the orbiting wrap 614 of the orbiting scroll 610 and the fixing wrap 624 of the fixed scroll 620.

For such eccentric rotation, the eccentric portion 430 may be formed such that the center of gravity of the cross section is different from the central axis of the rotation shaft portion 400.

The eccentric part 430 is located on one side of the main bearing part 420 and on the front side opposite to the shaft part 410 in the illustrated embodiment.

A third oil passage 526 to be described later is formed through the outer peripheral surface of the eccentric portion 430. Oil separated from the refrigerant compressed through the third oil passage 726 may be resupplied to the compression unit 600.

The sub-bearing part 440 is rotatably coupled to a rotation shaft coupling part (not shown) of the fixed scroll 620 of the compression part 600 and supported in a radial direction. The sub-bearing part 440 may pass through the rotational shaft coupling part 616 of the orbiting scroll 610.

Specifically, the eccentric portion 430 is coupled through the rotation shaft coupling portion 616 formed on the orbiting plate portion 612 of the orbiting scroll 610. In addition, the sub-bearing part 440 passes through the rotational shaft coupling part 616 of the orbiting scroll 610 and is rotatably coupled to the rotational shaft coupling part (not shown) of the fixed scroll 620.

In the illustrated embodiment, the sub-bearing part 440 is formed to have a smaller radius than the eccentric part 430. Therefore, the sub-bearing part 440 is not restricted in the radial direction by the rotational shaft coupling part 616 of the orbiting scroll 610.

The sub-bearing part 440 is located on one side of the eccentric part 430 and a front side opposite to the main bearing part 420 in the illustrated embodiment.

The oil supply guide passage 450 is a passage through which oil separated from the compressed refrigerant flows into the third oil passage 726. To this end, the oil supply guide passage 450 communicates with the third oil passage 726 and the first oil passage 722.

The oil supply guide passage 450 may be formed through the sub-bearing part 440 in the longitudinal direction, in the front-rear direction in the illustrated embodiment. In an embodiment, the oil supply guide passage 450 may be formed on the central axis of the sub bearing part 440.

(5) Description of the motor unit 500

The motor unit 500 is accommodated in the motor chamber 110 of the main housing 100, and the compression unit 600 provides power for compressing the refrigerant.

The motor unit 500 may be operated and controlled by power and a control signal applied from the inverter unit 300. To this end, the motor unit 500 and the inverter unit 300 may be connected to be energized.

The motor unit 500 is rotatably connected to the rotation shaft unit 400. Specifically, when the motor unit 500 is rotated, the rotation shaft unit 400 is also rotatably connected together.

The rotational force generated by the motor unit 500 may be transmitted to the orbiting scroll 610 of the compression unit 600 through the rotation shaft unit 400.

The motor unit 500 includes a stator 510 and a rotor 520.

When power is applied to the motor unit 500, the stator 510 is not rotated and the rotor 520 is rotated relative to the stator 510. The rotational force generated by the rotation of the rotor 520 is transmitted to the orbiting scroll 610 through the rotation shaft 400.

The stator 510 forms a magnetic field required to drive the motor unit 500 in response to power and control signals applied from the inverter unit 300. By the magnetic field formed by the stator 510, a magnet (not shown) provided in the rotor 520 may be rotated by receiving an electromagnetic force.

The stator 510 may include a plurality of coils (not shown). When power and control signals are applied from the inverter unit 300, a plurality of coils (not shown) form a magnetic field.

A magnetic field formed by a plurality of coils (not shown) exerts an electromagnetic force on a plurality of magnets (not shown) provided in the rotor 520. In this case, it is preferable that the plurality of coils (not shown) are arranged so that the directions of electromagnetic force to be received by the plurality of magnets (not shown) are the same.

In the illustrated embodiment, the stator 510 is disposed to surround the rotor 520 radially outside the rotor 520. That is, the stator 510 is provided in a cylindrical shape having a hollow portion partially accommodating the cylindrical rotor 520.

The outer surface of the stator 510 may be in contact with the inner surface of the motor chamber 110. In other words, the stator 510 may be fixed to the motor chamber 110.

The rotor 520 is rotated by a magnetic field formed by the stator 510. That is, when a magnetic field is formed by the stator 510, a plurality of magnets (not shown) provided in the rotor 520 receive electromagnetic force to rotate the rotor 520.

A rotating shaft part 400 is rotatably coupled to the rotor 520. In other words, the rotor 520 is coupled with the rotation shaft 400 to rotate together with the rotation shaft 400.

With the above configuration, the rotational force of the motor unit 500 may be transmitted to the orbiting scroll 610 coupled to the rotation shaft unit 400.

(6) Description of the compression unit 600

The compression unit 600 is rotated according to the rotation of the motor unit 500, and substantially performs a role of compressing the refrigerant. The compression unit 600 is rotatably connected to the motor unit 500 by a rotation shaft unit 400. That is, the rotation shaft part 400, the motor part 500, and the compression part 600 may be rotated together.

The compression unit 600 includes an orbiting scroll 610 and a fixed scroll 620.

The orbiting scroll 610 is rotated by the rotation of the motor unit 500. Specifically, the orbiting scroll 610 is rotatably connected to the eccentric portion 430 of the rotating shaft portion 400.

When the motor unit 500 is rotated, the eccentric unit 430 is rotated to have a different central axis from the rotation shaft unit 400 and the motor unit 500. That is, the eccentric portion 430 is rotated to be eccentric with respect to the central axis of the motor unit 500.

Accordingly, the orbiting scroll 610 rotatably coupled to the eccentric portion 430 is also rotated by being eccentric with respect to the central axis of the motor unit 500. As will be described later, the fixed scroll 620 is disposed to have the same central axis as the motor unit 500.

Therefore, the orbiting scroll 610 is rotated relative to the fixed scroll 620, but eccentrically rotated. Accordingly, the refrigerant may be compressed in a space between the orbiting wrap 614 of the orbiting scroll 610 and the fixing wrap 624 of the fixed scroll 620.

The orbiting scroll 610 may be accommodated in the main housing 100. Specifically, the orbiting scroll 610 may be located at one side of the motor unit 500 in the inner space of the main housing 100, and at the front side in the illustrated embodiment.

The orbiting scroll 610 includes an orbiting plate portion 612, an orbiting wrap 614, and a rotating shaft coupling portion 616.

The orbiting plate part 612 forms one side of the orbiting scroll 610. In the illustrated embodiment, the orbiting plate portion 612 forms the rear side of the orbiting scroll 610.

One side surface of the orbiting plate part 612, in the illustrated embodiment, may contact the rear side surface of the fixed scroll 620.

The orbiting wrap 614 is coupled to the fixed wrap 624 of the fixed scroll 620 to form a predetermined space. The orbiting wrap 614 may be eccentrically rotated with respect to the rotating shaft part 400 in a state in which the fixed wrap 624 is coupled. Accordingly, the refrigerant may be compressed in the space between the revolving wrap 614 and the fixed wrap 624.

The turning wrap 614 is formed protruding from the turning plate portion 612. In the illustrated embodiment, the orbiting wrap 614 is formed protruding from the front side of the orbiting plate portion 612.

In the illustrated embodiment, the orbiting wrap 614 is formed in a helical shape, but may be any shape that is coupled to engage with the fixation wrap 624 and can be rotated eccentrically relative to the fixation wrap 624.

The rotation shaft coupling portion 616 is a portion to which the rotation shaft portion 400 is coupled. Specifically, the eccentric portion 430 of the rotation shaft portion 400 is coupled through the rotation shaft coupling portion 616.

The rotation shaft coupling portion 616 is formed through the turning plate portion 612. In the illustrated embodiment, the rotation shaft coupling portion 616 is formed through the orbiting scroll 610 in the front-rear direction.

The radius of the rotation shaft coupling portion 616 is preferably determined to be equal to or slightly larger than the outer diameter of the eccentric portion 430 so that the eccentric portion 430 is coupled through.

The fixed scroll 620 is not rotated irrespective of the rotation of the motor unit 500. Accordingly, when the motor unit 500 is rotated, the orbiting scroll 610 may be rotated eccentrically relative to the fixed scroll 620.

The fixed scroll 620 is located on one side of the main housing 100 and on a front side opposite to the inverter unit 300 in the illustrated embodiment. The outer surface of the fixed scroll 620 may be exposed to the outside.

One side surface of the fixed scroll 620, in the illustrated embodiment, may be in contact with the front side surface of the main housing 100. In addition, a separate fastening member (not shown) may be provided to couple the fixed scroll 620 and the main housing 100.

One side surface of the fixed scroll 620, in the illustrated embodiment, forms a predetermined space between the rear housing 200 and is coupled to the rear housing 200.

As described above, the discharge chamber S3 is defined by the upper side of the space.

The fixed scroll 620 is rotatably coupled to the orbiting scroll 610. As described above. The fixed scroll 620 is fixed, and the orbiting scroll 610 is rotated relative to the fixed scroll 620.

The fixed scroll 620 includes a fixed plate portion 622, a fixed wrap 624, a discharge valve 626 and a discharge port 628.

In addition, a rotation shaft coupling portion (not shown) is formed on the fixed scroll 620 so that the sub-bearing portion 440 of the rotation shaft portion 400 may be rotatably coupled.

However, as described above, the fixed scroll 620 is not rotated regardless of the rotation of the motor unit 500. Therefore, it can be seen that the rotation shaft coupling part (not shown) of the fixed scroll 620 supports the rotation shaft part 400.

The fixed plate part 622 forms one side of the fixed scroll 620. In the illustrated embodiment, the fixed plate portion 622 forms the rear side of the fixed scroll 620.

One side surface of the fixed plate portion 622, in the illustrated embodiment, may be in contact with the front side surface of the orbiting scroll 610.

In the illustrated embodiment, a plurality of grooves are formed on the outer circumferential surface of the fixed plate portion 622. This is to reduce the weight of the electric compressor 10, its shape and number can be changed.

The fixed wrap 624 is coupled to the orbiting wrap 614 of the orbiting scroll 610 to form a predetermined space. After the fixed wrap 624 is combined with the orbiting wrap 614, when the orbiting scroll 610 is rotated according to the rotation of the motor unit 500, the refrigerant in the space between the fixed wrap 624 and the orbiting wrap 614 Can be compressed.

The fixed wrap 624 is formed protruding from the fixed plate portion 622. In the illustrated embodiment, the fixed wrap 624 is formed to protrude from the fixed plate portion 622 to the rear side.

In the illustrated embodiment, the fixed wrap 624 is formed in a spiral shape, but is coupled to engage with the orbiting wrap 614 so that the orbiting wrap 614 can be rotated relatively eccentric with respect to the fixed wrap 624. It can be a shape.

The discharge valve 626 is configured to open or close the discharge port 628, which is a passage through which the refrigerant compressed by the relative rotation of the orbiting scroll 610 and the fixed scroll 620 flows into the discharge chamber S3.

In one embodiment, the discharge valve 626 may be provided as a check valve such as a reed valve that restricts the flow of fluid in a single direction to open and close the fluid according to pressure.

The discharge valve 626 is located on one side of the fixed plate portion 622 facing the fixed wrap 624, and in the illustrated embodiment, on the front side of the fixed plate portion 622. Further, the discharge valve 626 is configured to cover the discharge port 628.

When the pressure of the compressed refrigerant reaches a predetermined pressure or higher, the discharge valve 626 opens the discharge port 628. Accordingly, the compressed refrigerant may flow into the discharge chamber S3.

When the pressure of the compressed refrigerant is less than the predetermined pressure, the discharge valve 626 closes the discharge port 628. Accordingly, the refrigerant having insufficient pressure does not flow into the discharge chamber S3.

The discharge port 628 is a passage through which the refrigerant compressed by the orbiting scroll 610 and the fixed scroll 620 flows into the discharge chamber S3. The discharge port 628 fluidly connects the space formed between the turning wrap 614 and the fixed wrap 624 and the discharge chamber S3 in fluid communication.

The discharge port 628 is configured to be open or closed. Specifically, a discharge valve 626 is provided in the discharge port 628, and the discharge port 628 may be opened or closed according to the pressure of the compressed refrigerant.

The refrigerant discharged through the discharge port 628 passes through the discharge chamber S3 and is discharged to the outside of the electric compressor 10 through the exhaust port 220.

(7) Description of the flow path part 700

The flow path part 700 is a path through which refrigerant and oil flow. The flow path part 700 is formed over the main housing 100 and the rear housing 200.

In an embodiment not shown, the flow path part 700 may also be formed in the inverter part 300. In this case, it is as described above that the refrigerant can directly cool the various inverter elements 360 constituting the inverter unit 300.

The flow path part 700 includes a refrigerant flow path part 710 and an oil flow path part 720.

The refrigerant passage part 710 is a passage through which refrigerant flows. The coolant passage part 710 is partitioned by a space formed inside the main housing 100. Alternatively, the coolant passage part 710 may be formed by a separate coolant passage forming member (not shown).

The coolant passage part 710 includes a first coolant passage 712 and a second coolant passage 714.

The first refrigerant flow path 712 communicates with the motor chamber 110 and the second refrigerant flow path 714. The refrigerant flowing into the motor chamber 110 of the main housing 100 through the intake port 120 is moved to the second refrigerant passage 714 through the first refrigerant passage 712.

In the illustrated embodiment, the first refrigerant passage 712 is located in the lower space inside the main housing 100. The first refrigerant passage 712 may be an arbitrary position capable of communicating the motor chamber 110 and the second refrigerant passage 714.

The second refrigerant flow path 714 communicates with the first refrigerant flow path 712 and the compression unit 600. Specifically, the refrigerant that has passed through the first refrigerant flow path 712 flows into the second refrigerant flow path 714.

The refrigerant flowing into the second refrigerant passage 714 is moved to a space formed between the orbiting scroll 610 and the fixed scroll 620 and compressed to have a predetermined pressure. The compressed refrigerant flows into the discharge chamber S3 through the discharge port 628 of the fixed scroll 620.

The refrigerant passage part 710 may be provided with a refrigerant guide member (not shown) configured to restrict a moving direction of the refrigerant flowing therein.

The oil passage part 720 is a passage through which oil flows. The oil passage part 720 is partitioned by a space formed inside the main housing 100 and the rear housing 200. Alternatively, the oil passage part 720 may be formed by a separate oil passage forming member (not shown).

The oil passage part 720 includes a first oil passage 722, a second oil passage 724 and a third oil passage 726.

The first oil passage 722 communicates with an oil chamber (not shown) formed in the internal space of the electric compressor 10 and the oil supply guide passage 450. The oil separated from the refrigerant in the discharge chamber S3 is discharged through the oil discharge passage 230 and collected in the oil chamber (not shown).

The oil collected in the oil chamber (not shown) is moved to the oil supply guide passage 450 of the rotation shaft part 400 through the first oil passage 722. In order for the oil to move smoothly, a power device (not shown) for providing a conveying force to the oil may be provided in the first oil passage 722.

The second oil flow passage 724 communicates the oil supply guide flow passage 450 with the space between the eccentric portion 430 and the rotation shaft coupling portion 616.

Oil introduced through the second oil flow path 724 is supplied between the eccentric portion 430 and the rotation shaft coupling portion 616 of the orbiting scroll 610. In other words, the second oil passage 724 flows into the space between the outer peripheral surface of the eccentric portion 430 and the rotation shaft coupling portion 616.

Accordingly, friction caused by the rotation of the orbiting scroll 610 is alleviated, so that the refrigerant can be efficiently compressed.

The third oil passage 726 communicates the oil supply guide passage 450 with a space between the sub-bearing portion 440 and the rotation shaft coupling portion (not shown) of the fixed scroll 620.

The oil introduced through the third oil flow path 726 is supplied between the sub-bearing part 440 and the rotating shaft coupling part (not shown) of the fixed scroll 620. In other words, the third oil flow path 726 flows into the space between the outer circumferential surface of the sub-bearing part 440 and the rotation shaft coupling part (not shown) of the fixed scroll 620.

Accordingly, friction caused by rotation of the rotation shaft part 400 is alleviated, so that the refrigerant can be efficiently compressed.

The oil flowing into the compression unit 600 may be mixed with the refrigerant introduced into the compression unit 600 through the refrigerant passage unit 710. The mixed fluid of the compressed refrigerant and oil is introduced into the discharge chamber S3, and a process of separating the refrigerant and oil is primarily performed.

3. Description of the heat dissipation structure 800 according to the embodiment of the present invention

The electric compressor 10 according to an embodiment of the present invention includes a heat dissipation structure 800 for effectively dissipating heat generated from the inverter element 360.

The heat dissipation structure 800 is located adjacent to the inverter unit 300 and the main housing 100 in which the inverter chamber S1 in which the inverter element 360 is accommodated is formed. The heat dissipation structure 800 is configured to dissipate the inverter element 360 by transferring heat generated by the inverter element 360 to the refrigerant.

Hereinafter, a heat dissipation structure 800 according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 12.

The heat dissipation structure 800 according to the illustrated embodiment includes a heat dissipation plate 810, a heat dissipation boss part 820, a heat dissipation cap 830, a heat dissipation wave part 840, and a heat dissipation uneven part 850 , A heat dissipation tooth 860, an outer peripheral heat dissipation part 870, and a coupling pin 880.

(1) Description of the heat sink 810

The heat dissipation plate 810 receives heat generated from the inverter element 360 inside the inverter unit 300 and transfers it to the refrigerant flowing inside the main housing 100. Accordingly, the inverter element 360 may be cooled.

The heat dissipation plate 810 is positioned between the main housing 100 and the inverter unit 300. Specifically, the heat dissipation plate 810 is coupled to the heat dissipation opening 312 formed in the inverter housing 310 of the inverter unit 300. In an embodiment, the heat dissipation plate 810 may be fitted to the heat dissipation opening 312.

The shape of the heat dissipation plate 810 is preferably determined according to the shape of the heat dissipation opening 312.

The heat dissipation plate 810 may be formed of a material having high thermal conductivity. This is to easily receive heat generated from the inverter element 360 and to easily transfer the received heat to the refrigerant.

In one embodiment, the heat dissipation plate 810 may be formed of aluminum (Al).

On one side of the heat dissipation plate 810 adjacent to the heat dissipation cap 830 to be described later, in the illustrated embodiment, a heat dissipation boss portion 820 protrudes from the rear side. That is, the heat dissipation boss part 820 protrudes from one side of the heat dissipation plate 810 facing the inverter part 300.

A plurality of heat radiation fins (not shown) may be provided on the heat radiation plate 810. Specifically, a plurality of heat dissipation fins (not shown) may be provided on one side of the heat dissipation plate 810 facing the inverter unit 300 or on one side of the main housing 100. The plurality of heat dissipation fins (not shown) are configured to effectively transfer heat transferred to the heat dissipation plate 810 to the refrigerant.

The heat dissipation plate 810 includes a communication part 812. The communication unit 812 is configured to communicate with the inverter unit 300 and the main housing 100. In one embodiment, the communication part 812 may be formed as an opening.

Part of the refrigerant introduced into the main housing 100 through the communication unit 812 may be introduced into the inverter unit 300. The introduced refrigerant may cool the inverter element 360. The refrigerant received from the inverter element 360 may be introduced into the main housing 100 again through the communication unit 812.

The size of the communication unit 812 may be determined in consideration of the cooling efficiency of the inverter element 360 and the compression efficiency of the electric compressor 10. In an embodiment not shown, a shield member (not shown) capable of adjusting the size of the communication part 812 may be provided.

The heat dissipation plate 810, the main housing 100, and the inverter unit 300 may be coupled by a fastening member (not shown). In one embodiment, the fastening member (not shown) may be provided with a screw member or the like.

(2) Description of the heat dissipation boss part 820

The heat dissipation boss part 820 is in contact with the heat dissipation cap 830 to receive heat generated from the inverter element 360. Heat transferred to the heat dissipation boss part 820 is transferred to the refrigerant through the heat dissipation plate 810.

The heat dissipation boss part 820 is formed to protrude from one side of the heat dissipation plate 810 facing the inverter part 300. In the illustrated embodiment, the heat dissipation boss part 820 is formed to protrude from the rear side of the heat dissipation plate 810.

In the illustrated embodiment, the heat dissipation boss portion 820 has a circular cross section and has a cylindrical shape protruding in the front-rear direction. The shape of the heat radiation boss part 820 may be changed to correspond to the shape of the heat radiation cap 830.

In the illustrated embodiment, the central axis in the front-rear direction of the radiating boss part 820 is formed to be spaced apart from the central axis of the radiating plate 810. The position of the central axis of the heat dissipation boss part 820 may be an arbitrary position to which the heat dissipation cap 830 contacted with the inverter element 360 may be coupled.

The heat dissipation boss part 820 may be formed of a material having high thermal conductivity. Accordingly, heat transferred to the heat dissipation boss part 820 may be effectively transferred to the heat dissipation plate 810.

The heat dissipation boss part 820 may be formed of a material having a high coefficient of thermal expansion. In particular, the heat dissipation boss part 820 may be formed of a material having a higher coefficient of thermal expansion than the material of the heat dissipation cap 830.

Accordingly, when heat is transferred to the heat dissipation boss part 820, thermal expansion of the heat dissipation boss part 820 proceeds earlier than the heat dissipation cap 830, and the contact area between the heat dissipation boss part 820 and the heat dissipation cap 830 Can be increased.

In an embodiment, the heat dissipation boss part 820 may be made of aluminum.

The heat dissipation boss part 820 includes a first contact surface 821, a second contact surface 822, and a pin insertion part 826.

The first contact surface 821 is a portion that contacts the heat dissipation cap 830. As will be described later, the contact area between the heat dissipation boss portion 820 and the heat dissipation cap 830 according to an embodiment of the present invention may be changed according to the amount of heat generated by the inverter element 360.

The heat radiation boss part 820 and the heat radiation cap 830 are in contact with each other through at least the first contact surface 821. In other words, the first contact surface 821 is in contact with the heat radiation cap 830 even when the heat radiation boss portion 820 is not thermally expanded.

Accordingly, the first contact surface 821 may be defined as a “always contact surface”.

The first contact surface 821 is one side adjacent to the heat dissipation cap 830 and a rear side in the illustrated embodiment.

Since the heat dissipation boss part 820 has a columnar shape including a bottom surface and an upper surface, the first contact surface 821 may be defined as a "top surface" of the heat dissipation boss part 820.

The second contact surface 822 is a portion that contacts the heat radiation cap 830 when the heat radiation boss portion 820 is thermally expanded. That is, when there is no heat generated because the electric compressor 10 is not operated or the amount of heat generated from the inverter element 360 is not large, the second contact surface 822 and the heat dissipation cap 830 are spaced apart a predetermined distance. Is maintained.

Accordingly, the second contact surface 822 may be defined as a “variable contact surface”.

The second contact surface 822 forms a predetermined angle with the first contact surface 821 and extends from the first contact surface 822. In the illustrated embodiment, the second contact surface 822 extends at a right angle to the first contact surface 821, but the angle may be changed.

In the illustrated embodiment, the second contact surface 822 is positioned between the first contact surface 822 and the heat dissipation plate 810.

Since the heat dissipation boss part 820 has a columnar shape including a bottom surface and an upper surface, the second contact surface 822 may be defined as a "side surface" of the heat dissipation boss part 820.

As will be described later, any one of a heat radiation wave portion 840, a heat radiation uneven portion 850, and a heat radiation tooth portion 860 may be formed on the second contact surface 822. Accordingly, a contact area between the second contact surface 822 and the heat dissipation cap 830 may be increased. A detailed description of this will be described later.

The pin insertion portion 826 is a portion into which a coupling pin 880 that maintains the coupling between the heat radiation boss portion 820 and the heat radiation cap 830 is inserted after the heat radiation boss portion 820 is inserted into the heat radiation cap 830 to be. The pin insertion portion 826 may include a fastening member (not shown) so that the inserted coupling pin 880 is not separated.

The pin insertion portion 826 is recessed from the first contact surface 821 along the protruding direction of the heat dissipation boss portion 820. In other words, the fin insertion portion 826 is formed to be recessed by a predetermined distance from the rear side of the heat radiation boss portion 820 toward the heat radiation plate 810.

The pin insertion part 826 may be formed along the central axis of the heat dissipation boss part 820. Accordingly, the combination of the heat dissipation boss portion 820 and the heat dissipation cap 830 may be stably maintained.

The shape of the pin insertion part 826 may be determined corresponding to the shape of the coupling pin 880. In one embodiment, the coupling pin 880 may be provided as a screw member, and the pin insertion portion 826 may have a thread formed therein.

(3) Description of the heat dissipation cap 830

The heat dissipation cap 830 contacts the inverter device 360 and receives heat generated from the inverter device 360. In addition, the heat dissipation cap 830 is in contact with the heat dissipation boss part 820 and transfers the received heat to the heat dissipation boss part 820 again.

The heat radiation boss part 820 may be inserted into the heat radiation cap 830. Specifically, the heat radiation cap 830 may be coupled to the heat radiation boss portion 820 to cover the heat radiation boss portion 820.

At this time, one side of the heat dissipation cap 830 (a first inner surface 831 to be described later) is in contact with the first contact surface 821 of the heat dissipation boss part 820. In addition, the other side surface of the heat dissipation cap 830 (a second inner surface 832 to be described later) is spaced apart from the second contact surface 822 of the heat dissipation boss 820 by a predetermined distance.

When the heat dissipation boss part 820 is expanded by the heat generated from the inverter element 360, the second contact surface 822 of the heat dissipation boss part 820 contacts the second inner surface 832. A detailed description of this will be described later.

In the illustrated embodiment, the heat dissipation cap 830 has a cylindrical shape including a space formed by recessing one side of the heat dissipation boss 820 by a predetermined distance.

The heat dissipation cap 830 may be coupled to the heat dissipation boss part 820 and may have any shape that may be spaced apart from the second contact surface 822 of the heat dissipation boss part 820 by a predetermined distance.

The heat dissipation cap 830 may be formed of a material having high thermal conductivity. In addition, the heat dissipation cap 830 may be formed of a material having a lower coefficient of thermal expansion than the heat dissipation boss part 820. In one embodiment, the heat dissipation cap 830 may be formed of iron (Fe).

Accordingly, the heat dissipation boss part 820 may first expand by heat sequentially transferred to the inverter element 360, the heat dissipation cap 830, and the heat dissipation boss part 820.

The heat dissipation cap 830 includes a first inner surface 831, a second inner surface 832, an outer circumferential surface 833, an insertion space part 834, an element coupling surface 835, and a pin coupling part 836.

The first inner surface 831 is a portion in which the heat dissipation cap 830 contacts the heat dissipation boss part 820. Specifically, the first inner surface 831 is a portion in contact with the first contact surface 821 of the heat radiation boss portion 820 inserted in the heat radiation cap 830.

In an embodiment of the present invention, the first inner surface 831 is configured to always contact the first contact surface 821. Accordingly, the heat generated by the inverter element 360 is configured to radiate heat through at least the first inner surface 831 and the first contact surface 821.

Accordingly, the first inner surface 831 may be defined as a “always in contact surface” like the first contact surface 821 described above.

The first inner surface 831 is defined as one side of the heat dissipation cap 830 facing the heat dissipation boss part 820 is recessed. That is, the first inner surface 831 is a surface on one side of the plurality of surfaces that form a groove (insertion space 834 to be described later) formed in the heat dissipation cap 830 toward the heat dissipation boss 820.

The area of the first inner surface 831 is preferably formed larger than the area of the first contact surface 821 of the heat dissipation boss part 820. Accordingly, the second inner surface 832 to be described later is also positioned to be spaced apart from the second contact surface 822 of the heat dissipation boss portion 820, so that the insertion space portion 834 may be defined.

The first inner surface 831 is preferably formed to be parallel to the first contact surface 821 of the heat dissipation boss portion 820. Accordingly, when the first inner surface 831 and the first contact surface 821 come into contact, a residual space is not generated due to a lifting phenomenon, etc., and is in close contact, thereby enabling effective heat dissipation.

The second inner surface 832 forms an inner peripheral surface of the heat dissipation cap 830. The second inner surface 832 extends from the first inner surface 831 to form a predetermined angle with the first inner surface 831. In the illustrated embodiment, the second inner surface 832 extends at a right angle to the first inner surface 831, but the predetermined angle may be changed.

As described above, the first inner surface 831 is a bottom surface of a groove (insertion space part 834 to be described later) formed by being recessed in one side of the heat dissipation cap 830 facing the heat dissipation boss part 820. In addition, the groove is generally formed in a cylindrical shape. At this time, the second inner surface 832 forms a side surface of the groove.

Accordingly, the first inner surface 831 may be defined as a “bottom surface” and the second inner surface 832 may be defined as a “side surface”.

When the heat radiation boss portion 820 is inserted into the insertion space portion 834 of the heat radiation cap 830, the second inner surface 832 is spaced apart from the second contact surface 822 of the heat radiation boss portion 820 by a predetermined distance.

When the heat generated by the inverter element 360 is received and the heat dissipation boss part 820 is thermally expanded, the second inner surface 832 contacts the second contact surface 822 of the heat dissipation boss part 820.

Accordingly, the second inner surface 832 may be defined as a “variable contact surface” like the second contact surface 822 described above.

As additional contact occurs between the second inner surface 832 and the second contact surface 822, a contact area capable of heat conduction increases. Accordingly, heat generated from the inverter element 360 can be effectively dissipated.

In addition, a heat radiation wave portion 840, a heat radiation uneven portion 850, a heat radiation tooth portion 860, and the like, which will be described later, may be formed on the second inner surface 832 to increase the surface area.

The outer circumferential surface 833 forms an outer surface of the heat dissipation cap 830. In the illustrated embodiment, the outer circumferential surface 833 is positioned between one side of the heat dissipation cap 830 adjacent to the heat dissipation boss portion 820 and an element coupling surface 835 to be described later. In addition, the heat dissipation cap 830 has a cylindrical shape with an insertion space 834 formed therein, and the outer peripheral surface 833 may be defined as a "side surface" of the heat dissipation cap 830.

The outer circumferential surface 833 cools the inverter element 360 by transferring heat transferred from the inverter element 360 to an arbitrary fluid in the space inside the inverter unit 300. In one embodiment, the arbitrary fluid may be air or a refrigerant.

As will be described later, the heat dissipation plate 810 may be provided with an outer circumferential heat dissipation portion 870 located radially outside the outer circumferential surface 833. When the outer heat radiating part 870 is expanded by the heat generated by the inverter element 360, an additional contact may be formed between the outer circumferential surface 833 and the outer heat radiating part 870. A detailed description of this will be described later.

In the illustrated embodiment, the outer peripheral surface 833 is formed in a curved surface. Alternatively, a heat radiation wave portion 840, a heat radiation uneven portion 850, and a heat radiation tooth portion 860, which will be described later, may be formed on the outer circumferential surface 833.

In this case, a heat radiation wave portion 840, a heat radiation uneven portion 850, and a heat radiation tooth portion 860 may be correspondingly formed on the outer heat radiation portion 870 for smooth contact.

The insertion space part 834 is a part into which the heat dissipation boss part 820 is inserted. The insertion space portion 834 is a groove in which one side of the heat radiation cap 830 facing the heat radiation boss portion 820 is recessed.

The insertion space 834 is defined by a first inner surface 831 and a second inner surface 832. That is, the insertion space 834 may be defined as an inner space of a cylinder having the first inner surface 831 as a bottom surface and the second inner surface 832 as a side surface.

The radial length of the insertion space part 834, that is, the length from the central axis of the heat dissipation cap 830 to the radial end of the insertion space 834, is the first contact surface 821 of the heat dissipation boss part 820. It is formed longer than the radius.

In other words, the second inner surface 832 defining the insertion space portion 834 is located radially outward from the second contact surface 822 of the heat dissipation boss portion 820. The second inner surface 832 is spaced apart from the second contact surface 822 by a predetermined distance.

The element coupling surface 835 is a portion in which the inverter element 360 contacts the heat dissipation cap 830. The element coupling surface 835 may be defined as one side surface of the heat radiation cap 830 facing the heat radiation boss part 820.

In the illustrated embodiment, the heat dissipation cap 830 has a cylindrical shape with an insertion space 834 formed therein. Accordingly, the element coupling surface 835 may be defined as a “bottom surface” of the heat dissipation cap 830.

A plurality of inverter elements 360 are coupled to contact the element coupling surface 835. In the illustrated embodiment, three inverter elements 360 are contacted by forming a row on one side of the element coupling surface 835 and three on the other side.

The number and arrangement of the inverter elements 360 in contact with the element coupling surface 835 may be changed.

A separate fastening member (not shown) may be provided to ensure fastening of the inverter device 360 and the device coupling surface 835. To this end, a fastening hole (not shown) for fastening a fastening member (not shown) may be formed in the inverter device 360 and the device coupling surface 835.

The element coupling surface 835 is preferably formed parallel to the heat dissipation contact surface 364 of the inverter element 360. Accordingly, when the device coupling surface 835 and the inverter device 360 come into contact, a space is not formed and is in close contact so that heat can be effectively transferred.

The fin coupling part 836 is coupled to the coupling pin 880 for maintaining the coupling state of the heat radiation cap 830 and the heat radiation boss part 820.

In the illustrated embodiment, the pin coupling portion 836 is formed through the heat dissipation cap 830 in the front-rear direction. In addition, the pin coupling portion 836 is located on the central axis of the heat dissipation cap 830.

The shape and position of the fin coupling portion 836 may be any shape and position capable of maintaining the coupled state of the heat radiation cap 830 and the heat radiation boss portion 820.

A thread (not shown) may be formed in the coupling pin 880 to prevent the coupling pin 880 from being removed from the pin coupling portion 836. In addition, a corresponding thread (not shown) may be formed in the pin coupling portion 836.

The coupling pin 880 is inserted through the pin coupling portion 836 and inserted into the pin insertion portion 826 of the heat dissipating boss portion 820. Accordingly, the combined state of the heat dissipation cap 830 and the heat dissipation boss 820 may be stably maintained.

(4) Description of the heat radiation wave part 840

Referring to FIG. 8, the heat radiation structure 800 according to the illustrated embodiment includes a heat radiation wave part 840. The heat radiation wave portion 840 is configured to increase a contact area between the heat radiation boss portion 820 and the heat radiation cap 830.

The heat radiation wave part 840 is formed on the second contact surface 822 of the heat radiation boss part 820 and the second inner surface 832 of the heat radiation cap 830, respectively.

The radiating wave portion 840 includes a plurality of convex portions 841 and concave portions 842 formed on the second contact surface 822, and a plurality of cap convex portions 843 and caps formed on the second inner surface 832 It includes a recess 844.

The convex portion 841 is formed to protrude from the second contact surface 822. Specifically, the convex portion 841 is formed to protrude from the second contact surface 822 toward the second inner surface 832.

The concave portion 842 is formed by being recessed from the second contact surface 822. Specifically, the concave portion 842 is formed to be recessed from the second contact surface 822 toward the central axis of the heat dissipation boss portion 820.

The convex portion 841 and the concave portion 842 are alternately formed continuously.

That is, assuming that the convex portion 841 and the concave portion 842 are one group, a plurality of groups are continuously formed on the second contact surface 822 along a direction parallel to the central axis of the radiating boss portion 820. .

Accordingly, the heat radiation wave portion 840 formed on the second contact surface 822 has a wave shape, that is, a wave shape.

The cap convex portion 843 is formed to protrude from the second inner surface 832. Specifically, the cap convex portion 843 is formed to protrude from the second inner surface 832 toward the second contact surface 822.

The cap concave portion 844 is formed by being recessed from the second inner surface 832. Specifically, the cap concave portion 844 is recessed in a direction from the second inner surface 832 toward the outer peripheral surface 833.

The cap convex portion 843 and the cap concave portion 844 are alternately formed continuously. Accordingly, the heat dissipation wave portion 840 formed on the second inner surface 832 has a wave shape, that is, a wave shape, similar to the above-described convex portion 841 and concave portion 842.

At this time, the convex portion 841, the concave portion 842 formed on the second contact surface 822, and the cap convex portion 843 and the cap concave portion 844 formed on the second inner surface 832 are formed to fit with each other.

That is, with respect to the direction perpendicular to the first inner surface 831, the convex portion 841 and the cap concave portion 844 are positioned at the same distance from each other.

Likewise, the concave portion 842 and the cap convex portion 843 are also positioned at the same distance in a direction perpendicular to the first inner surface 831.

Accordingly, as will be described later, when the heat dissipation boss portion 820 is thermally expanded, the convex portion 841 is fitted with the cap concave portion 844 and the concave portion 842 is fitted with the cap convex portion 843.

To this end, it is preferable that the convex portion 841 and the cap concave portion 844 are formed of surfaces having the same curvature. Likewise, it is preferable that the concave portion 842 and the cap convex portion 843 are also formed of surfaces having the same curvature.

The curvature of the radiating wave part 840 may be any curvature that satisfies the condition for increasing the contact area as described above.

A detailed description of a process in which the heat radiation wave portions 840 are aligned with each other by thermal expansion of the heat radiation boss portion 820 will be described later.

(5) Description of the heat dissipation irregularities 850

Referring to FIG. 9, the heat radiation structure 800 according to the illustrated embodiment includes a heat radiation uneven portion 850. The heat radiation uneven portion 850 is configured to increase a contact area between the heat radiation boss portion 820 and the heat radiation cap 830.

The heat dissipation irregularities 850 are formed on the second contact surface 822 of the heat dissipation boss part 820 and the second inner surface 832 of the heat dissipation cap 830, respectively.

The heat dissipation uneven portion 850 includes a plurality of protrusions 851 formed on the second contact surface 822 and a plurality of cap protrusions 852 formed on the second inner surface 832.

The protrusion 851 is formed to protrude from the second contact surface 822. Specifically, the protrusion 851 is formed to protrude in a direction from the second contact surface 822 toward the second inner surface 832.

The plurality of protrusions 851 are continuously formed at a predetermined distance apart from each other. That is, on the second contact surface 822, the protrusions 851 and the rest of the second contact surfaces 822 in which the protrusions 851 are not formed are alternately continuous in a direction perpendicular to the first contact surface 821.

Accordingly, the heat dissipation uneven portion 850 formed on the second contact surface 822 has an uneven shape.

The cap protrusion 852 is formed to protrude from the second inner surface 832. Specifically, the cap protrusion 852 is formed to protrude from the second inner surface 832 toward the second contact surface 822.

The plurality of cap protrusions 852 are continuously formed at a predetermined distance apart from each other. That is, on the second inner surface 832, in a direction perpendicular to the first inner surface 831, the cap protrusion 852 and the rest of the second inner surface 832 on which the cap protrusion 852 are not formed are alternately continuous. do.

Accordingly, the heat dissipation uneven portion 850 formed on the second inner surface 832 also has an uneven shape.

The protrusion 851 formed on the second contact surface 822 and the cap protrusion 852 formed on the second inner surface 832 are formed to fit each other.

That is, with respect to the direction perpendicular to the first inner surface 831, the protrusion 851 and the rest of the second inner surface 832 in which the cap protrusion 852 is not formed are positioned at the same distance from each other.

Likewise, with respect to a direction perpendicular to the first inner surface 831, the rest of the second contact surface 822 in which the protrusion 851 is not formed and the cap protrusion 852 are positioned at the same distance from each other.

Accordingly, as will be described later, when the heat dissipation boss portion 820 is thermally expanded, the protrusion 851 is fitted with the rest of the second inner surface 832 on which the cap protrusion 852 is not formed. Further, the cap protrusion 852 is fitted with the rest of the second inner surface 832 on which the protrusion 851 is not formed.

To this end, it is preferable that the protrusions of the protrusions 851 and the cap protrusions 852 are formed to be equal to each other.

In addition, it is preferable that the predetermined distance between the plurality of protrusions 851 is equal to the length of the cap protrusion 852 in the width direction (a direction perpendicular to the protrusion direction).

Likewise, a predetermined distance between the plurality of cap protrusions 852 is preferably formed equal to the length of the protrusion 851 in the width direction (a direction perpendicular to the protrusion direction).

Further, it is preferable that the shape of the end side (direction toward the second inner surface 832) of the protrusion 851 is formed to correspond to the shape of the second inner surface 832. Likewise, it is preferable that the shape of the end side (direction toward the second contact surface 822) of the and cap protrusion 852 is formed corresponding to the shape of the second contact surface 822.

The shape of the protrusion 851 and the cap protrusion 852 may be any shape that satisfies the condition for increasing the contact area as described above.

A detailed description of the process in which the heat dissipation uneven parts 850 are aligned with each other by thermal expansion of the heat dissipation boss part 820 will be described later.

(6) Description of the heat dissipation teeth 860

Referring to FIG. 10, the heat radiation structure 800 according to the illustrated embodiment includes a heat radiation tooth portion 860. The heat radiation teeth 860 are configured to increase a contact area between the heat radiation boss portion 820 and the heat radiation cap 830.

The heat dissipation teeth 860 are formed on the second contact surface 822 of the heat dissipation boss part 820 and the second inner surface 832 of the heat dissipation cap 830, respectively.

The heat dissipation toothed portion 860 includes a plurality of toothed protrusions 861 formed on the second contact surface 822 and a plurality of cap toothed protrusions 862 formed on the second inner surface 832.

The tooth-shaped protrusion 861 is formed to protrude from the second contact surface 822. Specifically, the tooth-shaped protrusion 861 is formed to protrude from the second contact surface 822 toward the second inner surface 832.

Each tooth-shaped protrusion 861 is formed such that the diameter of the cross section decreases toward the end side (in a direction toward the second inner surface 832 ). That is, each tooth-shaped protrusion 861 has a peak 861a formed at the end side.

The tip 861a may have an arbitrary shape in which the diameter of the cross section of the tooth-shaped protrusion 861 decreases toward the end side. In the illustrated embodiment, the tip 861a is chamfered (cut-off), but may be formed in a sharp shape without a separate chamfer.

The plurality of tooth-shaped protrusions 861 are continuously formed to be spaced apart a predetermined distance from each other. That is, on the second contact surface 822, the remaining portions of the second contact surface 822 on which the tooth-shaped protrusions 861 and the tooth-shaped protrusions 861 are not formed in a direction perpendicular to the first contact surface 821 are alternately continuous. do.

Accordingly, the heat dissipation toothed portion 860 formed on the second contact surface 822 has a dentoid shape.

The cap tooth-shaped protrusion 862 is formed to protrude from the second inner surface 832. Specifically, the cap tooth-shaped protrusion 862 is formed to protrude from the second inner surface 832 toward the second contact surface 822.

Each of the cap-toothed protrusions 862 is formed such that the diameter of the cross-section decreases toward the end side (in the direction toward the second contact surface 822 ). That is, each cap tooth-shaped protrusion 862 has a cap peak 862a formed on the end side.

The tip 862a may have any shape in which the diameter of the cross-section of the cap tooth-like protrusion 862 decreases toward the end side. In the illustrated embodiment, the tip 862a is chamfered, but may be formed in a sharp shape without a separate chamfer.

The plurality of cap tooth-shaped protrusions 862 are continuously formed to be spaced apart from each other by a predetermined distance. That is, on the second inner surface 832, the remaining portions of the second inner surface 832 in which the cap tooth-shaped protrusions 862 and the cap tooth-shaped protrusions 862 are not formed in a direction perpendicular to the first inner surface 831 are alternately formed. Is continuous.

Accordingly, the radiating teeth 860 formed on the second inner surface 832 also have a dentoid shape.

As the tooth-shaped protrusion 861 and the cap tooth-shaped protrusion 862 are configured to have a smaller diameter toward the end side, the tooth-shaped protrusion 861 and the cap tooth-shaped protrusion 862 can be more easily matched.

That is, since the tooth-shaped protrusion 861 and the cap tooth-shaped protrusion 862 are formed to be inclined in a direction approaching each other, they can be smoothly inserted into the space between the protrusions 861 and 862.

On the other hand, the tooth-shaped protrusion 861 formed on the second contact surface 822 and the cap tooth-shaped protrusion 862 formed on the second inner surface 832 are formed to fit with each other.

That is, with respect to the direction perpendicular to the first inner surface 831, the toothed protrusions 861 and the rest of the second inner surface 832 on which the cap toothed protrusions 862 are not formed are positioned at the same distance from each other.

Likewise, with respect to the direction perpendicular to the first inner surface 831, the cap-toothed protrusions 862 and the rest of the second contact surface 822 in which the toothed protrusions 861 are not formed are positioned at the same distance from each other.

Accordingly, as will be described later, when the heat dissipation boss portion 820 is thermally expanded, the toothed protrusion 861 is fitted to the rest of the second inner surface 832 on which the cap toothed protrusion 862 is not formed. In addition, the cap toothed protrusion 862 fits the rest of the second contact surface 822 on which the toothed protrusion 861 is not formed.

To this end, it is preferable that the shape of the tooth-shaped protrusion 861 and the cap tooth-shaped protrusion 862 are formed to correspond to each other.

In addition, it is preferable that the shape of the second contact surface 822 formed by the plurality of tooth-shaped protrusions 861 are spaced apart from each other to correspond to the shape of the cap tip 862a of the cap tooth-shaped protrusion 862.

Further, it is preferable that the shape of the second inner surface 832 formed by the plurality of cap tooth-shaped protrusions 862 are spaced apart from each other to correspond to the shape of the cap tip 861a of the tooth-shaped protrusion 861.

The shape of the tooth-shaped protrusion 861 and the cap tooth-shaped protrusion 862 may be any shape that satisfies the condition for increasing the contact area as described above.

A detailed description of the process in which the heat dissipation teeth 860 are aligned with each other by thermal expansion of the heat dissipation boss part 820 will be described later.

(7) Description of the outer radiating part 870

11 and 12, the heat dissipation structure 800 according to the illustrated embodiment includes an outer heat dissipation part 870. The outer circumferential heat dissipation part 870 is configured to be in contact with the heat dissipation cap 830 and is configured to increase the amount of heat transfer by contact.

The outer circumferential radiating part 870 is formed to protrude from the radiating plate 810 in a direction toward the radiating cap 830 from the radiating outer side of the radiating boss part 820.

In addition, the outer circumferential radiating part 870 is formed to protrude from the radiating plate 810 in a direction toward the radiating cap 830 from the radiating outer side of the radiating cap 830.

The outer radiating part 870 is formed to surround the radiating boss part 820 and the radiating cap 830.

In the illustrated embodiment, the heat radiation boss portion 820 and the heat radiation cap 830 have a cylindrical shape having a circular cross section. Accordingly, the outer circumferential radiating part 870 is also provided in a cylindrical shape with a hollow part formed therein. The shape of the outer circumferential radiating part 870 may be any shape capable of enclosing the radiating cap 830.

The outer radiating part 870 may be formed of a material having high thermal conductivity. In addition, the outer radiating part 870 may be formed of a material having a higher coefficient of thermal expansion than the radiating cap 830. Furthermore, the outer circumferential heat dissipation part 870 may be formed of the same material as the heat dissipation boss part 820.

In one embodiment, the outer circumferential heat dissipation part 870 may be an aluminum material.

The outer circumferential radiating part 870 includes a contact inner circumferential surface 871 and a contact outer circumferential surface 872.

The contact inner peripheral surface 871 is a portion in contact with the outer peripheral surface 833 of the heat dissipation cap 830. Heat transferred from the inverter element 360 to the heat dissipation cap 830 may be transferred to the heat dissipation plate 810 through the contact inner peripheral surface 871.

That is, the contact inner circumferential surface 871 is a portion in which the heat dissipation cap 830 contacts not only the heat dissipation boss part 820 but also the outer heat dissipation part 870. Accordingly, a contact area for the heat dissipation cap 830 to transfer heat may be increased.

It is preferable that the shape of the contact inner peripheral surface 871 is determined to correspond to the shape of the outer peripheral surface 833 of the heat dissipation cap 830. In the illustrated embodiment, the heat dissipation cap 830 is provided in a cylindrical shape so that the outer peripheral surface 833 is formed in a curved shape. The contact inner circumferential surface 871 may be formed as a curved surface having the same curvature as the outer circumferential surface 833.

The contact outer circumferential surface 872 forms an outer surface of the outer radiating portion 870. The contact outer circumferential surface 872 faces the contact inner circumferential surface 871.

In the embodiment illustrated in FIG. 11, the contact inner circumferential surface 871 of the outer circumferential radiating portion 870 and the outer circumferential surface 833 of the heat dissipating cap 830 are disposed to be spaced apart a predetermined distance. When the outer circumferential radiating part 870 receives heat and thermally expands, the contact inner circumferential surface 871 is moved toward the outer circumferential surface 833 to contact the outer circumferential surface 833.

In addition, in the embodiment illustrated in FIG. 12, the contact inner circumferential surface 871 of the outer radiating portion 870 and the outer circumferential surface 833 of the heat dissipating cap 830 are disposed to contact each other. When the outer circumferential radiating part 870 receives heat and thermally expands, the contact outer circumferential surface 872 may be moved in a direction opposite to the outer circumferential surface 833.

Although not shown, the heat dissipation wave part 840, the heat dissipation uneven part 850, and the heat dissipation toothed part 860 are in the contact inner circumferential surface 871 of the outer circumferential radiating part 870 and the outer circumferential surface 833 of the radiating cap 830 ) Can be formed.

In the above embodiment, the contact area between the outer radiating part 870 and the radiating cap 830 is further increased, so that the heat dissipation efficiency of the inverter element 360 may be improved.

(8) Description of the coupling pin 880

The coupling pin 880 maintains the coupling of the heat radiation boss portion 820 and the heat radiation cap 830.

The heat dissipation cap 830 is coupled to the heat dissipation boss part 820 so as to surround the heat dissipation boss part 820. At this time, the second inner surface 832 of the heat dissipation cap 830 and the second contact surface 822 of the heat dissipation boss portion 820 are spaced apart a predetermined distance. Therefore, a separate member is required to maintain the coupling between the heat radiation boss part 820 and the heat radiation cap 830.

The coupling pin 880 is coupled through the heat dissipation cap 830 and is inserted and coupled to the heat dissipation boss part 820 to maintain the coupling between the heat dissipation boss part 820 and the heat dissipation cap 830.

Specifically, the coupling pin 880 is inserted through the pin coupling portion 836 of the heat dissipation cap 830. In addition, a part of the coupling pin 880 facing the heat radiation boss portion 820 is inserted and coupled to the pin insertion portion 826 of the heat radiation boss portion 820.

By the coupling pin 880, the coupling of the heat radiation boss portion 820 and the heat radiation cap 830 may be stably maintained.

The coupling pin 880 may be coupled along a central axis of the heat dissipation boss part 820 and a central axis of the heat dissipation cap 830. In this case, the fin insertion part 826 and the fin coupling part 836 should also be formed along the central axis of the heat dissipation boss part 820 and the heat dissipation cap 830.

A thread (not shown) or the like may be formed on the outer periphery of the coupling pin 880 so that the coupling pin 880 is kept in a coupled state. In this case, a thread (not shown) may be formed in the inner periphery of the pin insertion portion 826 and the pin coupling portion 836.

4. Description of the heat transfer process of the heat dissipation structure 800 according to the embodiment of the present invention

The heat dissipation structure 800 according to the embodiment of the present invention includes a configuration for increasing the amount of heat received from the heat dissipation cap 830 for effective heat dissipation of the inverter element 360. This is because, as known, the amount of heat transfer by conduction is proportional to the contact area.

Hereinafter, a process in which a contact area for heat transfer is increased by the heat dissipation structure 800 according to an exemplary embodiment of the present invention, thereby improving the heat dissipation effect of the inverter element 360 will be described in detail.

(1) Description of the heat transfer process between the heat radiation boss part 820 and the heat radiation cap 830

As described above, the heat dissipation structure 800 according to the embodiment of the present invention includes a heat dissipation boss part 820 and a heat dissipation cap 830. The heat dissipation boss part 820 is formed of a material having a higher coefficient of thermal expansion than the heat dissipation cap 830.

Accordingly, when the heat of the inverter element 360 is transferred to the heat dissipation cap 830 and the heat dissipation boss part 820, the heat dissipation boss part 820 is expanded. Accordingly, a contact area between the heat dissipation cap 830 and the heat dissipation boss portion 820 may be increased.

Hereinafter, a heat transfer process between the heat radiation boss unit 820 and the heat radiation cap 830 according to an embodiment of the present invention will be described with reference to FIG. 13.

As the electric compressor 10 is operated, the inverter element 360 applies power and a control signal to the motor unit 500.

As the operation of the inverter device 360 proceeds, heat is generated in the inverter device 360. Some of the heat generated by the inverter element 360 is directly transferred to the air or refrigerant flowing inside the inverter chamber S1.

The heat dissipation contact surface 364 of the inverter element 360 is in contact with the element coupling surface 835 of the heat dissipation cap 830. Accordingly, heat generated by the inverter element 360 is transferred to the heat dissipation cap 830.

The radiating boss part 820 is inserted into the insertion space 834 of the radiating cap 830. In addition, the first contact surface 821 of the heat dissipation boss part 820 and the first inner surface 831 of the heat dissipation cap 830 contact each other. Therefore, the heat transferred to the heat dissipation cap 830 is transferred to the heat dissipation boss part 820.

The heat dissipation boss part 820 is formed of a material having a higher coefficient of thermal expansion than the heat dissipation cap 830. Therefore, even if the heat dissipation boss part 820 is thermally expanded at the same temperature, the heat dissipation cap 830 may not be thermally expanded.

As the amount of heat transferred to the heat dissipation boss part 820 increases, the heat dissipation boss part 820 thermally expands. At this time, the first contact surface 821 of the heat dissipation boss part 820 is in contact with the first inner surface 831 of the heat dissipation cap 830, and the coupled state is maintained by the coupling pin 880.

Accordingly, the heat dissipation boss portion 820 expands radially outward with respect to the central axis. Accordingly, the second contact surface 822 is moved toward the second inner surface 832 of the heat dissipation cap 830. When the thermal expansion of the heat dissipation boss part 820 continues, the second contact surface 822 contacts the second inner surface 832.

As a result, the area of heat transfer from the heat dissipation cap 830 to the heat dissipation boss part 820 is increased. Specifically, the heat transfer area is increased by the contact area between the second contact surface 822 and the second inner surface 832.

Accordingly, more heat generated by the inverter element 360 may be transferred from the heat dissipation cap 830 to the heat dissipation boss 820 for the same time period. As a result, the heat dissipation efficiency of the inverter device 360 may be improved.

Furthermore, since the contact area for heat dissipation may be actively changed according to the amount of heat generated by the inverter element 360, heat dissipation efficiency may be improved.

(2) Description of the heat transfer process between the heat dissipation cap 830 and the heat dissipation wave part 840, the heat dissipation uneven part 850 and the heat dissipation tooth 860

As described above, the heat dissipation structure 800 according to the embodiment of the present invention may include a heat dissipation wave part 840, a heat dissipation uneven part 850, and a heat dissipation toothed part 860. Each of the heat dissipation wave part 840, the heat dissipation concave and convex part 850, and the heat dissipation toothed part 860 are configured to increase a contact area between the heat dissipation boss part 820 and the heat dissipation cap 830.

Hereinafter, a heat transfer process between the heat dissipation cap 830 and the heat dissipation wave part 840, the heat dissipation irregularities 850 and the heat dissipation teeth 860 according to an embodiment of the present invention will be described with reference to FIGS. 14 to 16.

In this embodiment, a process in which the heat dissipation boss part 820 is thermally expanded by heat transferred from the inverter element 360 to the heat dissipation boss part 820 through the heat dissipation cap 830 is the same as the above-described embodiment.

Referring to FIG. 14, as the heat dissipation boss portion 820 is thermally expanded, the second contact surface 822 is moved toward the second inner surface 832 of the heat dissipation cap 830.

In this case, a heat radiation wave portion 840 is formed on the second contact surface 822 and the second inner surface 832. The convex portion 841 and the concave portion 842 of the second contact surface 822 and the cap concave portion 844 and the cap convex portion 843 of the second inner surface 832 are configured to fit each other.

Accordingly, as the second contact surface 822 is moved, the convex portion 841 is aligned with the cap concave portion 844 and the concave portion 842 is aligned with the cap convex portion 843.

Accordingly, a contact area between the heat radiation boss portion 820 and the heat radiation cap 830 is increased. In addition, due to the shape of the heat dissipation wave part 840, a contact area between the heat dissipation boss part 820 and the heat dissipation cap 830 may be further increased compared to a case in which planes contact each other.

Referring to FIG. 15, as the heat dissipation boss portion 820 is thermally expanded, the second contact surface 822 is moved toward the second inner surface 832 of the heat dissipation cap 830.

At this time, the heat dissipation irregularities 850 are formed on the second contact surface 822 and the second inner surface 832. The protrusions 851 of the second contact surface 822 and the cap protrusions 852 of the second inner surface 832 are alternately formed with each other.

Further, a plurality of the protrusions 851 and the cap protrusions 852 are spaced apart from each other by a predetermined distance, so that a predetermined space is formed between the protrusions 851 and 852.

Thus, as the second contact surface 822 is moved, the protrusions 851 fit into the space between the cap protrusions 852. In addition, the cap protrusions 852 fit into the space between the protrusions 851.

Accordingly, a contact area between the heat radiation boss portion 820 and the heat radiation cap 830 is increased. In addition, due to the shape of the heat dissipation irregularities 850, a contact area between the heat dissipation boss part 820 and the heat dissipation cap 830 may be further increased compared to a case in which planes are in contact with each other.

Referring to FIG. 16, as the heat dissipation boss portion 820 is thermally expanded, the second contact surface 822 is moved toward the second inner surface 832 of the heat dissipation cap 830.

At this time, heat dissipation teeth 860 are formed on the second contact surface 822 and the second inner surface 832. The toothed protrusions 861 of the second contact surface 822 and the cap toothed protrusions 862 of the second inner surface 832 are alternately formed with each other.

In addition, a plurality of the toothed protrusions 861 and the cap toothed protrusions 862 are spaced apart from each other by a predetermined distance, so that a predetermined space is formed between the protrusions 861 and 862.

Thus, as the second contact surface 822 is moved, the toothed protrusions 861 fit into the space between the cap toothed protrusions 862. In addition, the cap toothed protrusions 862 fit into the space between the toothed protrusions 861.

Accordingly, a contact area between the heat radiation boss portion 820 and the heat radiation cap 830 is increased. In addition, due to the shape of the heat dissipation teeth 860, a contact area between the heat dissipation boss part 820 and the heat dissipation cap 830 may be further increased compared to a case where planes are in contact with each other.

In the embodiment described above, the contact area between the heat dissipation boss portion 820 and the heat dissipation cap 830 may be increased by changing the shape of the portion where the second contact surface 822 and the second inner surface 832 contact.

Accordingly, the amount of heat transferred from the heat dissipation cap 830 to the heat dissipation boss part 820 is increased, and as a result, the heat dissipation efficiency of the inverter element 360 may be improved.

(3) Description of the heat transfer process between the radiating cap 830 and the outer radiating part 870

As described above, the heat dissipation structure 800 according to the embodiment of the present invention may include an outer circumferential heat dissipation part 870. The outer circumferential heat dissipation part 870 is configured to contact the outer circumferential surface 833 of the heat dissipation cap 830 to increase a heat transfer area of the heat dissipation cap 830.

Hereinafter, a heat transfer process between the heat dissipation cap 830 and the outer heat dissipation unit 870 according to an embodiment of the present invention will be described with reference to FIG. 17.

In this embodiment, a process in which the heat dissipation boss part 820 is thermally expanded by heat transferred from the inverter element 360 to the heat dissipation boss part 820 through the heat dissipation cap 830 is the same as the above-described embodiment.

Some of the heat transferred to the heat dissipation boss part 820 is transferred to the outer circumferential heat dissipation part 870 through the heat dissipation plate 810.

The outer radiating part 870 is formed of a material having a higher coefficient of thermal expansion than the radiating cap 830. Accordingly, the outer circumferential radiating part 870 is thermally expanded before the radiating cap 830.

As the outer circumferential radiating part 870 is thermally expanded, the contact inner circumferential surface 871 is moved toward the heat dissipating cap 830 to contact the outer circumferential surface 833.

Accordingly, an additional contact area is formed between the heat dissipation cap 830 and the outer heat dissipation part 870, so that the amount of heat transferred may be increased. As a result, heat dissipation efficiency of heat generated from the inverter device 360 may be further improved.

In an embodiment not shown, any one of a heat radiation wave portion 840, a heat radiation uneven portion 850, and a heat radiation tooth portion 860 may be formed on the outer peripheral surface 833 and the contact inner peripheral surface 871.

In the above embodiment, a contact area between the outer peripheral surface 833 and the contact inner peripheral surface 871 may be further increased. Accordingly, the heat dissipation efficiency of the inverter element 360 may be further improved.

Each heat transfer process described above may occur together.

That is, any one of the heat transfer processes between the heat dissipation wave part 840, the heat dissipation uneven part 850 and the heat dissipation teeth 860 described in (2), and the heat transfer process by the outer heat dissipation part 870 described in (3). Can proceed together.

Of course, it will be apparent that the heat transfer process between the heat dissipation boss part 820 and the heat dissipation cap 830 is premised.

In addition, heat generated from the inverter element 360 may be directly transferred to air or a refrigerant flowing in the inner space of the inverter chamber S1 to cool the inverter element 360.

Accordingly, according to the present invention, since the heat transfer area with the heat dissipation cap 830 increases as the heat dissipation boss part 820 is thermally expanded, heat generated from the inverter element 360 can be effectively dissipated.

In addition, the second contact surface 822 and the second inner surface 832 to which the heat radiation boss portion 820 and the heat radiation cap 830 are additionally contacted include a heat radiation wave portion 840, a heat radiation uneven portion 850, and a heat radiation tooth ( 860) may be formed to increase the contact area.

Accordingly, since the heat transfer area for heat dissipation is increased, heat generated from the inverter element 360 can be effectively radiated.

Furthermore, an outer peripheral heat dissipation part 870 may be provided on the outer peripheral surface 833 of the heat dissipation cap 830. The outer circumferential heat dissipation part 870 is configured to be in contact with the heat dissipation cap 830 by thermal expansion by the received heat.

Accordingly, since the heat transfer area for heat dissipation is further increased, heat generated from the inverter element 360 can be effectively dissipated.

Although the above has been described with reference to preferred embodiments of the present invention, those of ordinary skill in the art will variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

10: electric compressor
100: main housing
110: motor room
120: intake port
130: Oldham ring
200: rear housing
210: space part
220: exhaust port
230: oil drain passage
300: inverter unit
310: inverter housing
312: heat dissipation opening
320: inverter cover
330: connector part
332: communication connector
334: power connector
340: printed circuit board
350: inverter bracket
352: inverter element coupling portion
360: inverter element
362: connection pin
364: heat dissipation contact surface
400: rotation shaft part
410: shaft
420: main bearing part
422: balance weight
430: eccentric
440: sub bearing part
450: Refueling guide euro
500: motor unit
510: stator
520: rotor
600: compression unit
610: orbiting scroll
612: turning hard plate
614: turning wrap
616: rotation shaft coupling
620: fixed scroll
622: fixed end plate portion
624: fixed wrap
626: discharge valve
628: discharge port
700: Euro part
710: refrigerant flow path part
712: first refrigerant flow path
714: second refrigerant passage
720: oil flow path
722: first oil flow path
724: second oil flow path
726: third oil flow path
800: heat dissipation structure
810: heat sink
812: communication unit
820: heat dissipation boss part
821: first contact surface
822: second contact surface
826: pin insert
830: heat dissipation cap
831: the first inner
832: the second inner
833: outer peripheral surface
834: insertion space portion
835: element bonding surface
836: pin joint
840: heat dissipation wave unit
841: convex
842: recess
843: cap convex portion
844: cap recess
850: heat dissipation irregularities
851: protrusion
852: cap protrusion
860: heat dissipation teeth
861: toothed protrusion
861a: peak
862: cap toothed protrusion
862a: cap tip
870: outer heat radiating part
871: contact inner peripheral surface
872: contact outer peripheral surface
880: mating pin
S1: inverter room
S2: Back pressure chamber
S3: discharge chamber

Claims (15)

A main housing having a motor chamber in which the motor unit is accommodated;
An inverter unit located on one side of the main housing and accommodating an inverter element configured to control the motor unit therein;
A heat dissipation plate positioned between the main housing and the inverter and having a heat dissipation boss protruding from one side facing the inverter; And
And a heat radiation cap configured to at least partially surround the heat radiation boss portion,
The inverter element is in contact with the heat dissipation cap so that the generated heat is transferred to the heat dissipation cap,
Electric compressor. The method of claim 1,
The heat dissipation boss portion is formed of a material having a greater coefficient of thermal expansion than the material of the heat dissipation cap,
Electric compressor. The method of claim 2,
The heat dissipation boss part is formed of aluminum (Al), the heat dissipation cap is formed of iron (Fe),
Electric compressor. The method of claim 2,
The heat dissipation cap is configured to be in contact with the heat dissipation boss so that heat transferred to the heat dissipation cap is transferred to the heat dissipation boss part,
Electric compressor. The method of claim 4,
The heat dissipation boss part,
A first contact surface in contact with the heat dissipation cap; And
And a second contact surface extending from the first contact surface and forming a predetermined angle with the first contact surface,
The heat dissipation cap,
A first inner surface in contact with the first contact surface of the heat dissipation boss part;
And a second inner surface formed at a predetermined angle with the first inner surface and extending from the first inner surface and spaced apart from the second contact surface of the heat dissipation boss part by a predetermined distance,
Electric compressor. The method of claim 5,
When the heat dissipation boss part is thermally expanded by the heat transferred from the heat dissipation cap, the second contact surface of the heat dissipation boss part and the second inner surface of the heat dissipation cap are in contact with each other,
Electric compressor. The method of claim 5,
On the second contact surface of the heat dissipation boss part,
A concave portion in which the second contact surface is recessed; And
Convex portions protruding from the second contact surface are alternately formed,
On the second inner surface of the heat dissipation cap,
A cap recess in which the second inner surface is recessed; And
Cap convex portions protruding from the second inner surface are alternately formed,
When the heat dissipation boss part is expanded by the heat transferred from the heat dissipation cap,
The concave portion of the heat dissipation boss portion and the cap convex portion of the second inner surface are aligned,
It is configured so that the convex portion of the heat dissipation boss portion and the cap concave portion of the second inner surface are aligned,
Electric compressor. The method of claim 5,
On the second contact surface of the heat dissipation boss part,
A plurality of protrusions configured to be spaced apart from each other by a predetermined distance are formed to protrude from the second contact surface,
On the second inner surface of the heat dissipation cap,
A plurality of cap protrusions configured to be spaced apart from each other by a predetermined distance are formed to protrude from the second inner surface,
When the heat dissipation boss part is expanded by the heat transferred from the heat dissipation cap,
The protrusion of the heat dissipation boss part is inserted into the space between the cap protrusion of the heat dissipation cap,
The cap protrusion of the heat dissipation cap is configured to be inserted into the space between the protrusions of the heat dissipation boss part,
Electric compressor. The method of claim 5,
On the second contact surface of the heat dissipation boss part,
It is configured to be spaced apart from each other by a predetermined distance, and a plurality of tooth-like protrusions having a tip formed at an end are formed to protrude from the second contact surface,
On the second inner surface of the heat dissipation cap,
It is configured to be spaced apart a predetermined distance from each other, and a plurality of cap tooth-like protrusions having a cap tip formed at an end portion are formed to protrude from the second inner surface,
When the heat dissipation boss part is expanded by the heat transferred from the heat dissipation cap,
The toothed protrusion of the heat dissipating boss part is inserted into the space between the cap toothed protrusions of the heat dissipating cap,
The cap tooth-like protrusion of the heat dissipation cap is configured to be inserted into the space between the tooth-like protrusion of the heat dissipation boss part,
Electric compressor. The method of claim 1,
And a coupling pin configured to couple the heat radiation cap to the heat radiation boss portion,
The heat dissipation boss part,
A pin insertion portion which is formed indented along the protruding direction of the heat dissipation boss portion and into which the coupling pin is at least partially inserted,
The heat dissipation cap,
It is formed through the height direction of the heat dissipation cap, including a pin coupling portion through which the coupling pin is coupled,
Electric compressor. The method of claim 5,
It is formed protruding from the heat dissipation plate, and is spaced apart from the heat dissipation cap by a predetermined distance and includes an outer circumferential heat dissipation portion formed to surround the heat dissipation cap
Electric compressor. The method of claim 11,
The heat dissipation cap,
Forming an outer surface of the heat dissipation cap, and including an outer circumferential surface facing the outer circumferential radiating portion,
The outer radiating part,
Forming an inner surface of the outer circumferential heat dissipation unit, comprising a contact inner circumferential surface facing the heat dissipation cap,
Electric compressor. The method of claim 12,
When the heat dissipation boss part is thermally expanded by the heat transferred from the heat dissipation cap, the second contact surface of the heat dissipation boss part and the second inner surface of the heat dissipation cap are in contact with each other,
Electric compressor. The method of claim 13,
When the outer heat radiating portion is thermally expanded by the heat transferred from the heat radiating cap, the contact inner peripheral surface of the outer heat radiating portion and the outer peripheral surface of the heat radiating cap are in contact with each other,
Electric compressor. The method of claim 11,
The outer circumferential heat dissipation part is formed of a material having a greater coefficient of thermal expansion than the material of the heat dissipation cap,
Electric compressor.

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