Electric Compressor

Abstract

The CM choke (common mode choke) is arranged radially outside the inverter circuit board, and the high-voltage connector, CM choke, and low-voltage connector are integrated onto the support body, thereby providing an electric compressor that enables the inverter unit to be packaged more compactly and become lighter. [Solution] The device includes a housing, a compression unit provided within the housing, a motor unit provided within the housing and driving the compression unit, and an inverter unit coupled to one side of the housing and controlling the motor unit, wherein the inverter unit includes a support body arranged on one side of the housing, a circuit board attached to the support body, an inverter cover coupled to the housing so as to cover a portion of the support body on which the circuit board is attached, and a CM choke installed on the support body and positioned radially outward of the circuit board.

Description

[Technical field]

[0001] The present invention relates to an electric compressor, and more particularly to an electric compressor in which a common mode choke (CM choke) is disposed radially outside an inverter circuit board, and a high-voltage connector, a CM choke, and a low-voltage connector are integrated onto a support body, thereby enabling the packaging size and weight of the inverter to be reduced. [Background technology]

[0002] Generally, automobiles are equipped with an air conditioning system for heating and cooling the interior of the vehicle. Such an air conditioning system includes a compressor that compresses a low-temperature, low-pressure gas-phase refrigerant drawn from an evaporator into a high-temperature, high-pressure gas-phase refrigerant and sends it to a condenser.

[0003] Compressors used in such automobiles include mechanical compressors that are driven by the driving force of the engine and electric compressors that use an electrically driven motor. Recently, the use of electric compressors has been increasing as the number of automobiles equipped with electrical equipment has accelerated.

[0004] Meanwhile, there are two types of compressors: reciprocating compressors, which compress the refrigerant by the reciprocating motion of pistons, and rotary compressors, which compress the refrigerant by rotary motion. The reciprocating compressors include the crank type, which transmits the power to multiple pistons using a crank, and the swash plate type, which transmits the power to a rotating shaft with a swash plate, depending on the method of transmission of the power source. The rotary compressors include the vane rotary type, which uses a rotating rotary shaft and vanes, and the scroll type, which uses an orbiting scroll and a fixed scroll.

[0005] In addition, in the field of electric compressors, inverter-type compressors that can vary the operating speed of the motor are being actively developed. In such inverter-type electric compressors, the inverter is mounted on the outer periphery or one side of the casing, and is electrically connected to the motor installed inside the casing using terminals and bus bars that penetrate the casing.

[0006] In this case, in a conventional electric compressor, a CM choke for reducing high frequency noise is disposed on the inverter circuit board. For example, in the electric compressor disclosed in Patent Document 1, a common mode choke coil (34) is mounted on the inverter circuit board (29), which suppresses the transmission of high frequency noise generated in the PCU (39) on the vehicle side to the inverter circuit (31) on the compressor side.

[0007] In this manner, by disposing the CM choke on the circuit board (29) inside the inverter cover member (25), the area of ​​the circuit board (29) becomes larger, and as a result, the area and height of the inverter cover member (25) become larger, which creates a problem in that it is difficult to reduce the size and weight of the package of the inverter unit. Furthermore, since the connector (27) is provided on the outside of the inverter cover member (25) and protrudes in the direction away from the motor, the overall length of the electric compressor also increases. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Korean Patent Publication No. 2020-0115215 Summary of the Invention [Problem to be solved by the invention]

[0009] The present invention aims to provide an electric compressor in which a common mode choke (CM choke) is disposed radially outside of an inverter circuit board, and a high-voltage connector, a CM choke, and a low-voltage connector are integrated onto a support body, thereby enabling a reduction in the package size and weight of the inverter unit.

[0010] The technical problems that the present invention aims to achieve are not limited to the above-mentioned technical problems, and other technical problems not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following. [Means for solving the problem]

[0011] In order to solve the above problems, the present invention provides an electric compressor including a housing, a compression unit provided within the housing, a motor unit provided within the housing and driving the compression unit, and an inverter unit coupled to one side of the housing and controlling the motor unit, the inverter unit including a support body disposed on one side of the housing, a circuit board mounted on the support body, an inverter cover coupled to the housing to cover a portion of the support body on which the circuit board is mounted, and a CM choke installed on the support body and disposed radially outward of the circuit board.

[0012] The inverter cover may not cover the CM choke.

[0013] The support body may include a central portion to which the circuit board is attached, and a first accommodating portion extending from a radially outer side of the central portion toward the housing or toward the opposite side of the housing, and in which the CM choke is disposed.

[0014] The support body may further include a second receiving portion extending radially outward from the center portion and opposite to the first receiving portion, and having a high voltage connector disposed therein.

[0015] The first receiving portion and the second receiving portion may be disposed at the same position in the circumferential direction of the center portion.

[0016] The high voltage line of the high voltage connector may be directly connected to the CM choke through the inside of the support body.

[0017] The CM choke may be connected to the circuit board through a bus bar disposed inside the support body.

[0018] The support body may further include a third receiving portion extending radially outward from the center portion on the same side as the second receiving portion, and having a low-voltage connector disposed therein.

[0019] The low voltage lines of the low voltage connector may be connected to the circuit board through a bus disposed inside the support body.

[0020] The second receiving portion and the third receiving portion may be disposed at an angle of 30° to 180° in a circumferential direction of the center portion.

[0021] The center of the support body and the inverter cover may be formed in a circular shape, and the inverter cover may cover the center.

[0022] The support body may include a fastening hole for fastening the circuit board to the support body.

[0023] The support body may have an outer surface provided with a groove for fastening the inverter cover to the housing. Effect of the Invention

[0024] According to the present invention, since the CM choke is disposed radially outside the circuit board, the size of the circuit board can be reduced, and since the CM choke is not disposed inside the inverter cover, the width and length of the inverter cover can be reduced, thereby achieving the effects of reducing the size and weight of the inverter package, reducing costs, and increasing design freedom, and also reducing the overall length of the electric compressor.

[0025] In addition, since the high voltage connector and the low voltage connector are integrally formed with the support body, no additional bolts or processing is required, which reduces the number of parts and the weight, thereby reducing costs and increasing productivity.

[0026] It should be understood that the effects of the present invention are not limited to the effects described above, but include all effects that can be inferred from the configuration of the invention described in the detailed description of the present invention or the claims. [Brief description of the drawings]

[0027] [Figure 1] 1 is a perspective view illustrating an electric compressor according to the present invention; [Diagram 2] FIG. 2 is a side view illustrating the electric compressor of FIG. 1 in a partially separated state. [Diagram 3] FIG. 3 is a perspective view of FIG. 2. [Figure 4] 3 is a front view showing a schematic separation of a support body on which a circuit board is mounted in FIG. 2; FIG. [Diagram 5] FIG. 5 is a side view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] Hereinafter, an electric compressor according to the present invention will be described with reference to the accompanying drawings.

[0029] In addition, the terms used below are defined in consideration of their functions in the present invention, and may vary depending on the intention or practice of the user or operator. The examples below do not limit the scope of the present invention, but are merely illustrative of the elements presented in the claims of the present invention.

[0030] In order to clearly explain the present invention, parts that are not relevant to the description will be omitted, and the same reference numerals will be used throughout the specification for the same or similar components. Throughout the specification, when a part "includes" a certain component, this does not mean that other components are excluded, but that other components may be further included, unless otherwise specified.

[0031] First, the configuration of an electric compressor (1) of the present invention will be briefly described with reference to FIGS.

[0032] The electric compressor of the present invention mainly comprises a housing (10), a motor section, a compression section, an inverter section (20), and a terminal unit (30) that electrically connects the motor section and the inverter section (20).

[0033] The housing (10) forms the exterior of the electric compressor (1), and in this embodiment, is made up of a front housing (12) and a rear housing (14).

[0034] The motor section is provided in the front housing 12 and provides power for the compression section to compress the refrigerant. Although not shown, the motor section may include a rotor coupled to a rotating shaft rotatably installed at the center of the front housing 12, and a stator fixed to the front housing 12 and disposed radially outward of the rotor. The stator may also include a stator core and a coil wound around the stator core.

[0035] The compression unit is provided in the rear housing 14 and may include an orbiting scroll coupled to a rotating shaft through an eccentric bushing (not shown) and a fixed scroll fixed between the front housing 12 and the rear housing 14 to form a compression chamber in which the refrigerant is compressed together with the orbiting scroll. As such, the compression unit is connected to the motor unit through the rotating shaft, so that the rotational force generated by the motor unit can be transmitted to the orbiting scroll of the compression unit by the rotating shaft. However, the present invention is not limited to this and it goes without saying that other types of compression units can be used.

[0036] The inverter unit 20 is coupled to one side of the housing 10, but is coupled to the opposite side of the compression unit with respect to the motor unit. The inverter unit 20 is electrically connected to the motor unit and applies power to the motor unit through power and control signals transmitted from the outside to control its operation. In particular, the stator forms an electromagnetic field by the power applied from the inverter unit 20, and the rotor rotates due to the electromagnetic field formed by the stator, generating a rotational force for driving the compression unit.

[0037] At this time, the motor section and the inverter section (20) may be electrically connected by a terminal unit (30). Although not limited thereto, in this embodiment, a three-phase motor is used, so that three connecting pins (32) and three terminals (34) respectively connected to the three phases are provided to supply three-phase power from the inverter section (20) to the motor section. The three connecting pins (32) are respectively connected to the three-phase coils of the stator and protrude through the housing (10) to the inside of the inverter section (20). Each of the connecting pins (32) protruding to the inside of the inverter section (20) penetrates the circuit board (200) of the inverter section and is electrically connected to the circuit board (200) through each terminal (34).

[0038] The inverter unit 20 will be described in detail below with reference to Figures 2 to 5. The inverter unit 20 can include a support body 100, a circuit board 200, an inverter cover 300, a CM choke 400, a high voltage connector 500, and a low voltage connector 600.

[0039] The support body 100 is disposed on one side of the front housing 12, and a circuit board 200 having a switching element 220 is mounted on the support body 100. In this embodiment, the support body 100 includes a circular center portion 120 on which the circuit board 200 is mounted. The support body 100 may be made of a resin material.

[0040] At this time, the support body (100), more precisely the center portion (120) of the support body, is provided with a fastening hole (122) for fastening the circuit board (200) to the support body (100). As a result, a fastening part such as a bolt passes through the fastening hole (122) of the circuit board (200) and the support body (100) and is fastened to the front housing (12), so that the circuit board (200) can be fixed on the center portion (120) of the support body. Also, the center portion (120) of the support body is provided with a through hole (124) through which the connecting pin (32) of the terminal unit (30) passes. In addition, the center portion (120) of the support body may be formed with a slot for mounting a switching element (220).

[0041] In the present invention, the CM choke (400) is installed in the support body (100) and disposed radially outward of the circuit board (200). Therefore, the support body (100) includes a first receiving portion (140) extending from the radially outer side of the center portion (120) toward the housing (10) and in which the CM choke (400) is disposed. Specifically, a first protrusion (130) protrudes radially outward from the center portion (120) of the support body, and the first receiving portion (140) is extended from the first protrusion (130) toward the housing (10). However, the present invention is not limited thereto, and the first receiving portion (140) may be extended to the opposite side of the housing (10).

[0042] In addition, the support body (100) may further include a second receiving portion (160) that extends radially outward from the center portion (120) in a direction opposite to the first receiving portion (140) and has a high voltage connector (500) disposed therein. In this case, it is preferable that the first receiving portion (140) and the second receiving portion (160) are disposed at the same position in the circumferential direction of the center portion (120). The second receiving portion (160) may be disposed behind the first receiving portion (140). Specifically, the second receiving portion (160) is formed by extending on the first protruding portion (130) in a direction opposite to the housing (10).

[0043] As a result, the high voltage line of the high voltage connector (500) can be directly connected to the CM choke (400) through the inside of the support body (100). As shown in Figure 5, the high voltage line of the high voltage connector (500) can extend into the inside of the first protrusion (130) of the support body (100) and be directly connected to one end of the coil (420) of the CM choke (400).

[0044] Also, the CM choke (400) can be connected to the circuit board (200) through a first bus bar (240) disposed inside the support body (100). As shown in Fig. 5, the other end of the coil (420) of the CM choke (400) is connected to the first bus bar (240), which extends to the circuit board (200) inside the support body (100) and is electrically connected to the circuit board (200). At this time, the first bus bar (240) extends in a straight line from the first protrusion (130) of the support body toward the center (120) and the end is bent at approximately 90 degrees to penetrate the center (120) of the support body and the circuit board (200).

[0045] In addition, the support body (100) may further include a third receiving portion (180) that extends radially outward from the center portion (120) on the same side as the second receiving portion (160) and has a low-voltage connector (600) disposed therein. Specifically, a second protrusion (170) protrudes radially outward from the center portion (120) of the support body, and a third receiving portion (180) is formed on the second protrusion (170) by extending to the opposite side of the housing (10). In this case, the second receiving portion (160) and the third receiving portion (180) may be disposed at an angle of 30° to 180° in the circumferential direction of the center portion (120).

[0046] The low voltage line of the low voltage connector (600) can be connected to the circuit board (200) through a second bus bar (260) disposed inside the support body (100). As shown in Fig. 5, the low voltage line of the low voltage connector (600) is connected to the second bus bar (260), and the second bus bar (260) extends from the inside of the support body (100) to the circuit board (200) and is electrically connected to the circuit board (200). At this time, the second bus bar (260) extends linearly from the center (120) of the second protrusion (170) of the support body, and the end is bent at approximately 90 degrees to pass through the center (120) of the support body and the circuit board (200).

[0047] The inverter cover (300) is coupled to the front housing (12) so as to cover a portion of the support body (100) on which the circuit board (200) is mounted, but does not cover the CM choke (400).

[0048] In this embodiment, the inverter cover (300) is formed in a circular shape like the center portion (120) of the support body, and the inverter cover (300) is coupled to the front housing (12) so as to surround the center portion (120). That is, only the circuit board (200) is disposed inside the inverter cover (300), and the CM choke (400), high voltage connector (500), and low voltage connector (600) are not disposed inside the inverter cover (300). Therefore, the inverter cover (300) may be formed with two slots (320) through which the first protrusion (130) and the second protrusion (170) pass.

[0049] In addition, a groove 126 for fastening the inverter cover 300 to the housing 10 may be provided on the outside of the support body 100, more precisely, on the outside of the center portion 120 of the support body. That is, the fastening portion may be fastened to the front housing 12 from the inverter cover 300 through the groove 126 of the support body. As a result, the inverter cover 300 may be fastened to the front housing 12 with the support body 100 interposed between the front housing 12 and the inverter cover 300, and the support body 100 may be fixed. At this time, an O-ring 40 may be disposed between the support body 100 and the front housing 12 for sealing.

[0050] According to the present invention, since the CM choke (400) is disposed radially outward of the circuit board (200), the size of the circuit board (200) can be reduced, and since the CM choke (400) is not disposed inside the inverter cover (300), the width and length of the inverter cover (300) can be reduced. This provides the effects of reducing the size, weight, and cost of the inverter package and increasing the degree of freedom in design, and also reduces the overall length of the electric compressor.

[0051] In addition, since the high voltage connector (500) and the low voltage connector (600) are integrally configured with the support body (100) together with the CM choke (400), no additional bolts or processing is required, which reduces the number of parts and weight, resulting in reduced costs and increased productivity.

[0052] The present invention is not limited to the specific embodiments and explanations described above, and various modifications can be made by a person having ordinary knowledge in the technical field to which the present invention belongs without departing from the gist of the present invention as claimed in the claims, and such modifications are within the protection scope of the present invention. [Industrial Applicability]

[0053] The present invention relates to an electric compressor, and more particularly to an electric compressor in which a common mode choke (CM choke) is disposed radially outside an inverter circuit board, and a high-voltage connector, a CM choke, and a low-voltage connector are integrated onto a support body, thereby enabling the packaging of the inverter unit to be reduced in size and weight. [Explanation of symbols]

[0054] 1 Electric compressor 10. Housing 12 Front housing 14 Rear housing 20 Motor section, compression section, inverter section 30 Terminal Unit 32 Connecting pin Terminal 34 100 Support Body 120 Center 122 Concluding Hole 124 Through Hole 126 Groove 130 1st protrusion 140 First storage section 160 Second Storage Unit 170 Second protrusion 180 Third Storage Unit 200 Circuit Board 220 Switching element 240 First bus bar 260 2nd bus bar 300 inverter cover 320 Slots 400CM Chalk 420 Coil 500 High Voltage Connector 600 Low Voltage Connector

Claims

1. housing, A compression portion provided within the housing; a motor section provided within the housing and configured to drive the compression section; and an inverter unit coupled to one side of the housing and controlling the motor unit, the inverter unit including: a support body disposed on one side of the housing; a circuit board mounted on the support body; an inverter cover coupled to the housing to cover a portion of the support body on which the circuit board is mounted; and a CM choke disposed on the support body and radially outwardly of the circuit board; The support body has a central portion to which the circuit board is attached; A first housing portion extending from a radially outer side of the central portion toward the housing or toward the opposite side of the housing, the first housing portion having the CM choke disposed therein; and a second housing portion extending from the radially outer side of the central portion toward the opposite side to the first housing portion and having a high voltage connector disposed therein; An electric compressor, characterized in that the circuit board, the CM choke, and the high-voltage connector are integrated within the support body.

2. 2. The electric compressor according to claim 1, wherein the inverter cover does not cover the CM choke.

3. The electric compressor according to claim 1 , wherein the first housing portion and the second housing portion are disposed at the same position in the circumferential direction of the central portion.

4. 2. The electric compressor of claim 1, wherein the high voltage line of the high voltage connector is directly connected to the CM choke through the inside of the support body.

5. 5. The electric compressor of claim 4, wherein the CM choke is connected to the circuit board through a bus bar disposed inside the support body.

6. 2. The electric compressor according to claim 1, wherein the support body further includes a third accommodating portion extending radially outward from the center portion on the same side as the second accommodating portion and having a low-voltage connector disposed therein.

7. 7. The electric compressor according to claim 6, wherein a low voltage line of the low voltage connector is connected to the circuit board through a bus bar disposed inside the support body.

8. 7. The electric compressor according to claim 6, wherein the second housing portion and the third housing portion are disposed at an angle of 30 degrees or more and 180 degrees or less in the circumferential direction of the center portion.

9. 2. The electric compressor according to claim 1, wherein the central portion of the support body and the inverter cover are formed in a circular shape, and the inverter cover covers the central portion.

10. 2. The electric compressor of claim 1, wherein the support body has fastening holes for fastening the circuit board to the support body.

11. 2. The electric compressor according to claim 1, wherein the support body has an outer surface provided with a groove for fastening the inverter cover to the housing.

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