KR20130026291A - Electric compressor - Google Patents

Abstract

PURPOSE: An electric compressor is provided to implement a compact electric compressor by reducing the size of an area which a high voltage connector for an inverter input and a low voltage connector occupy. CONSTITUTION: An electric compressor comprises a driving unit(12) which generates rotation driving power; a compression unit(11) which compresses fluid by the rotation driving power; and an inverter unit(20) which is built in an inverter casing(20). The inverter casing protrudes from the upper side of the driving unit. A high voltage connector(30) and a low voltage connector(40) are formed to protrude in a direction parallel to the central axis from the inverter casing which protrudes to the upper side.

Description

Electric Compressor

The present invention relates to a motor-driven compressor, and more particularly, to a motor-driven compressor that reduces the area occupied by a high voltage connector and a low voltage connector for inverter input in an inverter integrated motor compressor.

An electric compressor is a device which compresses a fluid by rotating a compressor by an electric motor. An inverter integrated motor compressor is a device in which an inverter that compresses an electric motor is integrated into an electric compressor, and is particularly widely used for compressing a refrigerant in a vehicle cooling system. In general, the inverter integrated electric compressor includes a drive unit, a compression unit, a discharge unit, and an inverter unit.

The drive unit includes a drive unit housing forming an outer body, and a stator and a rotor mounted coaxially in the drive unit housing.

The compression unit is configured to include a compression unit housing constituting an outer body and coupled to the rear of the drive housing, and a rotating scroll and a fixed scroll mounted to rotate relative to the compression housing.

The discharge part is configured to connect the discharge hole and the discharge port leading to the refrigerant line by the discharge part housing which closes the refrigerant discharge hole of the compression part.

The inverter unit includes a cover housing constituting an outer body and coupled to the front of the drive unit housing, an inverter mounted inside the cover housing, and various drive circuits, elements, and connectors. The inverter unit also serves as a control unit that performs operation control.

An example of a conventional inverter integrated electric compressor is disclosed in Patent Document 1, which will be described with reference to FIG. 1. 1 is attached to Patent Document 1, and reference numerals are used as it is.

The motor-driven compressor 1 according to FIG. 1 incorporates a compression mechanism part 4 and an electric motor 5 in its main body casing 3. The electric motor 5 is driven by the inverter part 101, and the compression mechanism part 4 is driven by the electric motor 5. The compression mechanism unit 4 sucks, compresses, and discharges the low pressure refrigerant on the refrigeration cycle through the suction port 8 provided in the inverter case 102. The discharged coolant enters the electric motor 5 side and cools the electric motor 5, and is discharged from the discharge port 9 of the main body casing 3 in a refrigerating cycle.

The inverter case 102 is fastened to the main body casing 3 by the bolt 56. The inverter cover 113 is fixed to the inverter case 102 with a bolt 55. In addition, the inverter unit 101 is attached with a connector 117 for electrical connection with the outside. The external connector 119 is connected to this connector 117, and electric power is supplied.

The connector 117 is installed horizontally along the surface of the motor compressor 1 in the direction toward the motor compressor 1. That is, the center axis of the connector 117 and the center axis of the electric compressor 1 are arranged in parallel. In addition, the high voltage side connector pin and the low voltage side connector pin are installed in the connector 117 at the same time, and thus the connector 117 is formed to have a long cross section.

Another example of an inverter integrated motor compressor will be described with reference to FIGS. 2 and 3. 2 is a front view and a left side view of a conventional inverter integrated motor compressor, and FIG. 3 is a plan view of the motor compressor of FIG.

The electric compressor 100 according to FIGS. 2 and 3 includes a compression unit 111 and a driving unit 112 embedded in the main body casing 110. The driving unit 112 drives the compression unit 111 to rotate. An inverter casing 120 is installed at one end of the main body casing 110. In the inverter casing 120, an inverter for supplying current to the driving unit 112 and various driving circuits are disposed.

The inverter casing 120 protrudes above the main body casing 110, and the high voltage side connector 130 is horizontally disposed along the surface of the main body casing 110 in the direction toward the main body casing 110. The low voltage side connector 140 is installed. That is, the high voltage side connector 130 and the low voltage side connector 140 are disposed in the same direction on the same side of the inverter casing 120.

In the conventional inverter integrated motor compressor described above, the high voltage side connector and the low voltage side connector protrude in the same direction, that is, in a direction from the inverter casing toward the main body casing. This increases the volume of the inverter casing in contact with the connector, which is disadvantageous in terms of package. This is particularly a limitation in installing an electric compressor in a hybrid vehicle, a fuel cell, an electric vehicle, or the like, which has a large number of parts, compared with an engine driven vehicle.

Patent Document 1: Japanese Patent Application Laid-Open No. 2010-101307

The present invention has been made to solve the problems of the conventional electric compressor as described above, in the inverter integrated motor compressor to reduce the area occupied by the high voltage connector and low voltage connector for inverter input to provide an electric compressor that is advantageous for packaging Has its purpose.

In order to achieve the above object, the present invention, the drive unit for generating a rotational drive force, the compression unit for compressing the fluid by the rotational drive force generated in the drive unit, the inverter is installed at one end along the central axis of the drive unit and the compression unit An electric compressor including an inverter unit embedded in a casing, wherein the inverter casing protrudes upward from the driving unit, and the high voltage side connector and the low voltage side protruded in a direction parallel to the central axis from the inverter casing protruding upward. And a connector, wherein one of the high voltage side connector and the low voltage side connector protrudes from the inverter casing in a first direction toward the driving unit, and the other of the high voltage side connector and the low voltage side connector is the first connector. Protruding in the second direction opposite to the one direction It provides a motor-driven compressor characterized in that.

Here, the high voltage side connector and the low voltage side connector may be coaxially located.

The high voltage side connector may protrude in the first direction, and the low voltage side connector may protrude in the second direction.

Meanwhile, the high voltage side connector and the low voltage side connector may be configured to be detachably attached to the inverter casing in the form of an integrated assembly.

According to the electric compressor of the present invention, it is possible to provide an electric compressor that is advantageous for packaging by reducing the area occupied by the high voltage connector and the low voltage connector for inverter input in the inverter integrated motor compressor.

In particular, the electric compressor according to the present invention is advantageous to be employed in cooling systems such as hybrid vehicles, fuel cell vehicles, and electric vehicles, which have more internal parts than engine driven vehicles.

1 is a left side view and a front view schematically showing the structure of a conventional electric compressor.
Figure 2 is a front view and a left side view schematically showing the structure of another conventional electric compressor.
3 is a plan view of the electric compressor according to FIG. 2;
4 is a front view and a left side view schematically showing the structure of the electric compressor according to the embodiment of the present invention.
5 is a plan view of the electric compressor according to FIG. 4;
6 is a front view and a left side view schematically showing the structure of an electric compressor according to another embodiment of the present invention.
7 is a front view and a left side view schematically showing the structure of the electric compressor according to another embodiment of the present invention.
8 is a front view and a left side view schematically showing the structure of an electric compressor according to another embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, it includes not only "directly connected" but also "indirectly connected" with another member in between. . In addition, when a part is said to "include" a certain component, this means that it may further include other components, without excluding the other components unless otherwise stated.

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

4 is a front view and a left side view schematically showing the structure of the electric compressor according to the embodiment of the present invention, and FIG. 5 is a plan view of the electric compressor according to FIG.

The motor-driven compressor 1 according to an embodiment of the present invention includes a compression unit 11 and a driver 12 embedded in the main body casing 10, and an inverter unit (not shown) embedded in the inverter casing 20. do. The main body casing 10 is formed in a cylindrical shape, and in FIG. 4, the compression part 11 and the driving part 12 inside the main body casing 10 are shown in a block form for convenience, but in fact, the main casing 10 is formed in a cylindrical shape like the main body casing. It is common to be.

The inverter casing 20 is provided at one end of the main body casing 10 (the right end of the main body casing 10 in the drawing) along the central axis L of the compression unit 11 and the drive unit 12. The inverter casing 20 is integrally formed in the main body casing 10, where the integral casing 20 does not mean that the inverter casing 20 and the main body casing 10 are fixedly coupled to such an extent that they cannot be separated. For example, the inverter casing 20 may be bolted to the body casing 10.

The driving unit 12 receives a current from the inverter unit to generate a rotational driving force, and the fluid is compressed in the compression unit 11 by the rotational driving force generated by the driving unit 12.

The general configuration of the drive unit 12 is known, but specifically described as follows. First, the drive unit 12 is composed of a stator fixed in the main body casing 10 and a rotor rotating inside the stator. The stator is a kind of electromagnet and is composed of a stator core fixedly mounted on the inner circumferential surface of the main body casing 10 and a coil bundle wound around the stator core. The stator is a driving part that generates a rotational driving force together with a rotor coaxially mounted inside, and includes a stator core fixedly mounted on the inner circumferential surface of the main body casing 10 by a kind of electromagnet and a coil bundle wound around the stator core.

The stator core is a hollow cylindrical member having a through hole into which a rotor is inserted on the central axis L. A plurality of ribs protrude radially inwardly and are arranged at regular intervals in the circumferential direction on the inner circumferential surface of the stator core. The ribs extend long along the axial direction of the stator core for winding the coil.

The rotor is a portion coaxially mounted inside the stator to drive rotation, and the rotor is rotatably inserted into a hole in the center of the stator core of the stator. The rotor is composed of a rotating shaft arranged long along the central axis L, and a permanent magnet attached to the outer circumferential surface of the rotating shaft. The rotor is driven to rotate according to the driving principle of the motor when the stator is excited. To this end, the rotor is rotatably supported on the main body casing 10 through a bearing.

The compression part 11 is a part which compresses a fluid, for example, the refrigerant | coolant of a vehicle cooling system, by rotating by the rotation drive force which the drive part 12 generate | occur | produces.

The general configuration of the compression unit 11 is known, but described in detail as follows. First, the compression unit 11 is configured to include a rotational scroll connected to the rear end of the rotation axis of the drive unit 12 and a fixed scroll that matches with the rotational scroll and compresses and discharges the fluid when the rotational scroll rotates. .

The swing scroll has a rotating scroll wrap curved in a spiral shape so as to converge toward the center, and is protruded from the rear side, and the rear end of the rotating shaft of the driving unit is coupled to the swing scroll wrap to rotate in synchronization with the rotor.

The fixed scroll is formed to protrude on one inner end surface of the main body casing 10, and the fixed scroll wrap curved in a spiral shape is arranged to converge toward the center so as to match with the swing scroll wrap of the swing scroll.

Therefore, when the swing scroll rotates, the fluid sucked from the driving unit to the outer edge of the swing scroll wrap and the fixed scroll wrap is compressed while moving to the center thereof by the action of the mutually matched swing scroll wrap and the fixed scroll wrap. It is pumped to the outside through the discharge hole located at the center.

Through this configuration, the compression unit 11 sucks the low pressure refrigerant on the refrigerating cycle and compresses the discharge. The discharged refrigerant may return to the refrigeration cycle through the discharge port provided in the main body casing 10 while cooling the drive unit 12 by entering the drive unit 12 side.

Herein, although the compression unit 11 and the driving unit 12 are both described as being embedded in the main body casing 10, the main body casing 10 may be formed by a combination of two or more casings. For example, the compression unit 11 may be formed in the compression unit casing, the driving unit 12 may be embedded in the driving unit casing, and the compression unit casing and the driving unit casing may be coupled to each other. In addition, an intermediate casing may be interposed between the compression unit 11 or the driving unit 12 and the main body casing 10.

Inside the inverter casing 20, an inverter for supplying current to the driving unit 12 by receiving power from the outside is embedded, and various driving circuits and elements may also be embedded. The inverter casing 20 protrudes above the main body casing 10, and the high voltage side connector 30 and the low voltage side connector 40 are respectively provided at the portion of the protruding inverter casing 20.

In addition, a plurality of bolt holes (not shown) for coupling with the main body casing 10 may be formed in the inverter casing 20, and the inverter casing 20 and the main body casing 10 may be formed by fastening bolts through the bolt holes. ) Will be integrally combined.

The high voltage side connector 30 and the low voltage side connector 40 are parts for electrical connection, and generally have a hexahedral shape that protrudes outwards, and pins are provided therein. However, the shapes of the high voltage side connector 30 and the low voltage side connector 40 are not limited thereto.

The high voltage side connector 30 and the low voltage side connector 40 are formed to protrude from the inverter casing 20 in a direction parallel to the central axis L of the compression unit 11 and the drive unit 12. The direction from the inverter casing 20 toward the main body casing 10 is called a first direction, and the direction opposite to the first direction, that is, from the main body casing 10 toward the inverter casing 20, is referred to as a second direction. The high voltage side connector 30 is formed to protrude outwardly along the first direction from the surface of the inverter casing 20, and the low voltage side connector 40 is along the second direction from the surface of the inverter casing 20. It may be formed to protrude outward.

When the high voltage side connector 30 and the low voltage side connector 40 are installed in the same direction, the contact area with the high voltage side connector 30 and the contact area with the low voltage side connector 40 are on the same side of the inverter casing 20. Since this requires a larger portion of the protruding portion due to the connector (see Fig. 2), as shown in Fig. 4, when the high voltage side connector 30 and the low voltage side connector 40 are installed in different directions One side surface of the inverter casing 20 (the surface facing the first direction) needs only a contact area with the high voltage side connector 30, and the low voltage side connector 40 has the other side surface of the inverter casing 20 facing the second direction. What is necessary is just to install on the surface}, and as a whole, the volume of the part which protrudes by a connector in the inverter casing 20 becomes small.

This increases the degree of freedom in installing the motor-compressor, and in particular, the packageability is excellent in installing the motor-driven compressor in a vehicle cooling system having a small installation space of the motor-compressor. This effect is particularly useful for hybrid vehicles, fuel cell vehicles, electric vehicles, etc., which have more internal parts than engine driven vehicles.

4 and 5, the high voltage side connector 30 and the low voltage side connector 40 are preferably coaxial. However, the configuration is not necessarily limited to the above configuration, and the high voltage side connector 30 and the low voltage side connector 40 protrude in opposite directions to each other, and thus the portion of the inverter casing 20 protruding upward due to the connector. If this can be made small, it is also possible that the shaft on which the high voltage side connector 30 is disposed and the shaft on which the low voltage side connector 40 is arranged slightly shift.

Next, the structure of the electric compressor according to another embodiment of the present invention will be described. The same reference numerals are given to the same elements as in the above-described embodiment, and redundant descriptions thereof will be omitted.

6 is a front view and a left side view schematically showing a structure of a motor-driven compressor according to another embodiment of the present invention, and FIGS. 7 and 8 are views schematically showing the structure of the motor-driven compressor according to another embodiment of the present invention. Front view and left side view.

In the electric compressor 1 shown in FIG. 6, unlike the previous embodiment, the low voltage side connector 40 protrudes in the first direction, and the high voltage side connector 30 protrudes in the second direction. Also in this embodiment, the effect that the volume of the part which protrudes by the connector in the inverter casing 20 becomes small is acquired similarly.

In the motor-driven compressor 1 shown in FIG. 7, the arrangement of the compression unit 11 and the drive unit 12 is interchanged with the previous embodiment. That is, the compression part 11 is arrange | positioned near the inverter casing 20, and the drive part 12 is arrange | positioned far from the inverter casing 20. As shown in FIG. The motor-driven compressor shown in FIG. 7 may be referred to as a high pressure compressor, and the motor-driven compressor shown in FIG. 4 may be referred to as a low pressure compressor.

In the electric compressor 1 illustrated in FIG. 8, the high voltage side connector 30 and the low voltage side connector 40 are assembled to be detachably attached to the inverter casing 20 in the form of an assembly 21 in which the high voltage side connector 30 is integrally coupled. The assembly 21 may be assembled to the inverter casing 20 by bolt fastening, but is not necessarily limited thereto. According to this embodiment, the high voltage side connector 30 and the low voltage side connector 40 can be assembled after being fabricated as a separate assembly 21 from the inverter casing 20 so that the efficiency of the manufacturing process can be improved, and the connector failure In the event of failure, it is easy to investigate the trouble and replace the parts.

In FIG. 8, the high voltage side connector 30 is protruded in the first direction as in FIG. 4, but the low voltage side connector 40 may protrude in the first direction as in the above-described embodiment of FIG. 6. Similarly to the seventh embodiment, the arrangement of the compression section 11 and the drive section 12 can be changed.

The foregoing description of the present invention is intended for illustration, and it will be understood by those skilled in the art that the present invention may be easily modified in other specific forms without changing the technical spirit or essential features of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: motorized compressor
10: main body casing
11: compression section
12: drive unit
20: inverter casing
30: high voltage side connector
40: low voltage side connector
L: central axis

Claims (4)

A driving unit 12 for generating a rotational driving force, a compression unit 11 for compressing a fluid by the rotational driving force generated by the drive unit 12, and along the central axis of the drive unit 12 and the compression unit 11 An electric compressor including an inverter unit embedded in an inverter casing 20 installed at one end thereof,
The inverter casing 20 protrudes upward from the driving part 12, and has a high voltage side connector 30 and a low voltage formed to protrude in a direction parallel to the central axis from the inverter casing 20 protruding upward. Further includes a side connector 40,
One of the high voltage side connector 30 and the low voltage side connector 40 protrudes from the inverter casing 20 in a first direction toward the driving unit 12, and the high voltage side connector 30 and the The other one of the low voltage side connector (40) is protruding in a second direction opposite to the first direction. The method of claim 1,
The high voltage side connector (30) and the low voltage side connector (40) is characterized in that located on the coaxial motor. The method according to claim 1 or 2,
The high voltage side connector (30) is protruding in the first direction, the low voltage side connector (40) is characterized in that protruding in the second direction. The method according to claim 1 or 2,
The high voltage side connector (30) and the low voltage side connector (40) is an electric compressor, characterized in that detachable to the inverter casing (20) in the form of an integrally coupled assembly (21).

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