WO2020096201A1

WO2020096201A1 - Electric compressor

Info

Publication number: WO2020096201A1
Application number: PCT/KR2019/012554
Authority: WO
Inventors: 김상현; 김기만; 김태경; 최순용
Original assignee: 엘지전자 주식회사
Priority date: 2018-11-09
Filing date: 2019-09-27
Publication date: 2020-05-14
Also published as: KR20200053983A

Abstract

An electric compressor according to the present invention comprises: a compression module for compressing a fluid; and an inverter module for controlling the operation of the compression module, wherein the inverter module comprises: a printed circuit board having a first surface and a second surface arranged to be facing opposite directions, and having a side surface formed between the first surface and the second surface along the outer circumference of the printed circuit board; and a cylindrical or faceted cylindrical capacitor electrically connected to the printed circuit board, and the bottom surface of the capacitor corresponding to the bottom surface of the cylindrical or faceted cylindrical shape is arranged to face the side surface of the printed circuit board.

Description

Electric compressor

The present invention relates to an electric compressor driven by a motor.

The compressor is divided into a mechanical type using an engine as a driving source and an electric type using a motor as a driving source.

As an electric compressor, a scroll compression method suitable for high-compression ratio operation is widely known. Inside the sealed casing of the scroll compression type electric compressor (hereinafter, abbreviated as an electric compressor in this specification), an electric part composed of a driving motor is installed. In addition, a compression unit composed of a fixed scroll and a swinging scroll is installed on one side of the transmission unit. The transmission section and the compression section are connected to the rotating shaft. The rotational force of the transmission part is transmitted to the compression part through the rotation axis. In addition, the compression unit compresses a fluid such as a refrigerant by the rotational force transmitted through the rotating shaft.

A rotational force caused by rotation of the driving motor and a compression force of gas repelling the rotational force are applied to the rotating shaft. Such rotational force and compression force are applied in the radial direction of the rotational axis. The scroll compressor is equipped with a journal bearing such as a bush bearing on the frame, and the journal bearing supports the rotating shaft to smoothly drive the rotating shaft.

Since the electric compressor is driven by a motor, it has electrical components for controlling the motor and the like. In particular, among various electrical components, a power conversion device (converter, inverter, etc.) includes a capacitor. The capacitor serves to stabilize the voltage. Large and small capacitors are used in electric compressors.

Capacitors are one of the biggest parts of the life of a power converter. In the power converter, the life of the capacitor is a major factor in determining the failure of the power converter. The cause of shortening the life of the capacitor is that the temperature and current ripple (ripple) account for a large proportion. In particular, since the capacitor has the largest volume in the power converter, it is greatly affected by the surrounding environment such as heat compared to other electrical components.

Prior Patent Publication No. 10-2017-0067451 (2017.06.16.) Discloses a configuration in which a capacitor housing is installed on one surface of a printed circuit board, and the capacitor is mounted in a state lying on the housing. When the capacitor is mounted in a laid down state, the thickness of the power converter may be reduced compared to being mounted on a printed circuit board with the capacitor standing up. When the capacitor housing is disposed between the printed circuit board and the capacitor, there may be an effect of blocking the direct conduction of various elements of the printed circuit board or the heat of the electrical circuit pattern to the capacitor. In addition, the electrolyte leaking from the capacitor may be temporarily stored in the capacitor housing to protect other devices.

However, under the condition that requires a thinner thickness, the structure of the patent document alone is insufficient.

In addition, heat generated from the elements of the printed circuit board or the electrical circuit pattern is consequently conducted to the capacitor through the capacitor housing. Considering that more heat is generated in a power conversion device requiring high performance, the structure of the patent document is insufficient to protect the capacitor from high heat.

Finally, since the storage of the electrolyte in the capacitor housing is a temporary role, it cannot fundamentally block the overflow of the electrolyte into the printed circuit board. In addition, as the size of the capacitor increases, the amount of the electrolyte increases, and thus, an increase in the size of the capacitor causes an increase in the size of the electrolyte storage unit.

One object of the present invention is to propose a structure that can further reduce the thickness of the power conversion device than the prior art.

Another object of the present invention is to provide a structure capable of fundamentally blocking heat from a device or an electrical circuit pattern of a printed circuit board to a capacitor. The present invention is to extend the life of the capacitor through this structure, and to propose a configuration that can prevent the failure of the power conversion device having the capacitor.

Another object of the present invention is to provide a structure capable of fundamentally blocking the flow of the electrolyte into the printed circuit board even if a phenomenon occurs in which the electrolyte leaks from the capacitor.

In order to achieve such an object of the present invention, an electric compressor according to an embodiment of the present invention includes a printed circuit board and a capacitor, and a bottom surface of the capacitor is disposed to face a side surface of the printed circuit board.

The printed circuit board has first and second surfaces arranged to face opposite directions, and the side surfaces are formed between the first surface and the second surface along an outer edge of the printed circuit board.

The capacitor is electrically connected to the printed circuit board.

The capacitor has a cylindrical or polygonal column shape, and the bottom surface of the printed circuit board corresponds to the bottom surface of the cylinder or the bottom surface of the polygonal column.

The capacitor on the basis of looking at the side surface of the printed circuit board, the intermediate portion overlapping the printed circuit board; A side portion protruding from the intermediate portion toward a direction in which the first surface of the printed circuit board faces; And a second portion protruding from the intermediate portion toward a direction in which the second surface of the printed circuit board faces, so as to protrude in a direction opposite to the protruding direction of the one portion.

The shape of the one portion and the shape of the other portion may be symmetrical to each other based on when the printed circuit board is viewed from the lateral direction of the printed circuit board.

The capacitor has a first terminal and a second terminal protruding from positions spaced apart from each other on the bottom surface.

The first terminal is connected to an electrical circuit pattern formed on the first surface of the printed circuit board, and the second terminal is connected to an electrical circuit pattern formed on the second surface of the printed circuit board.

The distance between the first terminal and the second terminal in the thickness direction of the printed circuit board is the same as the thickness of the printed circuit board.

The first terminal and the second terminal each protrude in only one direction.

The first terminal and the second terminal are formed at positions symmetrical to each other with respect to the printed circuit board.

The first terminal and the second terminal are formed at positions not overlapping each other in the thickness direction of the printed circuit board.

The printed circuit board has a receiving portion formed to receive the capacitor, the capacitor is inserted into the receiving portion along a direction orthogonal to the thickness direction of the printed circuit board, the circumference of the receiving portion partially covers the capacitor It is formed to wrap.

The side surface of the printed circuit board has a first side surface, a second side surface, and a third side surface corresponding to the circumference of the receiving portion, and the first side surface of the capacitor corresponding to the bottom surface of the cylinder or the polygonal column. Is disposed to face the bottom, the second side is connected to one end of the first side, the side of the cylinder or the side of the capacitor corresponding to the side of the polygonal column is arranged to face from one side, the first The three sides are connected to the other end of the first side, and are arranged to face the side of the capacitor corresponding to the side of the cylinder or the side of the polygonal column from the other side.

The capacitors are provided in a plurality to form a capacitor assembly and arranged side by side, the first side is arranged to face the bottom of each capacitor, and the second side is a side surface of the capacitor disposed at one end of the capacitor assembly. It is arranged to face each other, and the third side faces the side surface of the capacitor disposed at the other end of the capacitor assembly.

The capacitors are provided in a plurality to form a capacitor assembly and arranged side by side, the electric compressor further includes a housing formed to receive the capacitor assembly, the housing corresponding to the bottom of the cylinder or the bottom of the polygonal column. It is formed to surround one of the two bottom surfaces of the capacitor and the side surface of the capacitor corresponding to the side surface of the cylinder or the side surface of the polygonal column.

The housing is provided with fixing portions protruding from both ends, the fixing portion is formed to contact at least one of the first surface and the second surface of the printed circuit board, the fastening member to the printed circuit board A fastening hole corresponding to the fastening hole of the printed circuit board is provided to be coupled.

The housing is provided with a protection part formed to surround the capacitor, the protection part is provided as many as the number of capacitors provided in the capacitor assembly, a slit is formed between each of the two protection parts, the slit is the height direction of the cylinder or It is formed along the height direction of the capacitor corresponding to the height direction of the polygonal column.

The bottom surface of the capacitor and the side surface of the printed circuit board are spaced apart from each other.

According to the present invention having the above-described configuration, the printed circuit board and the capacitor are disposed at positions not overlapping each other in the thickness direction of the printed circuit board. Therefore, when calculating the thickness of a circuit component including a printed circuit board and a capacitor, the thickness of the printed circuit board may be excluded, and as a result, the thickness of the inverter module may be thinner than before.

In addition, according to the present invention, the capacitor is not mounted on one side of the printed circuit board, but is disposed lying on the side of the printed circuit board. Therefore, it is possible to fundamentally block the heat generated from the electrical circuit pattern of the printed circuit board from conducting through the bottom or side of the capacitor. Furthermore, since the capacitor and the printed circuit board are spaced apart from each other except for the electrical connection by the first terminal and the second terminal, the effect of heat transfer by convection mechanism as well as conduction is small.

Since the life of the capacitor is greatly influenced by surrounding heat, the life of the capacitor can be extended according to the present invention, in which the capacitor is less affected by heat than the conventional one.

In addition, according to the present invention, since the side surface of the printed circuit board serves as a guard for fixing the position of the capacitor, the position can be fixed even if the capacitor is subjected to an external force such as an impact or is continuously affected by vibration.

In addition, according to the present invention, the electrolyte can be temporarily stored by the housing, and the electrolyte can be prevented from flowing to the printed circuit board. And the heat generated in the capacitor can be dissipated through the slit of the housing.

1 is a perspective view showing an example of an electric compressor proposed in the present invention.

FIG. 2 is an exploded perspective view showing a compression module and an inverter module separated from the electric compressor illustrated in FIG. 1.

3 is an exploded perspective view of the inverter module shown in FIG. 2.

4 is a perspective view of circuit components provided in the inverter module of FIG. 3.

5 is a side view of a circuit component provided in the inverter module of FIG. 3.

6 is a perspective view showing a state before the housing of the circuit component further comprising a housing.

7 is a perspective view showing a state after the housing of the circuit component further comprising a housing.

Hereinafter, the electric compressor according to the present invention will be described in more detail with reference to the drawings.

In the present specification, the same or similar reference numerals are assigned to the same or similar configurations in different embodiments, and the description is replaced with the first description.

When an element is said to be "connected" or "connected" to another component, it is understood that other components may be directly connected to or connected to the other component, but there may be other components in between. It should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that no other component exists in the middle.

As used herein, a singular expression includes a plural expression unless the context clearly indicates otherwise.

The electric compressor 1000 includes a compression module 1100 and an inverter module 1200.

The compression module 1100 refers to a set of parts for compressing a fluid such as a refrigerant. The inverter module 1200 refers to a set of components for controlling the driving of the compression module 1100. The inverter module 1200 may be coupled to one side of the compression module 1100. If the directionality is set based on the flow of the fluid compressed by the electric compressor 1000, one side of the compression module 1100 refers to the front side of the compression module 1100. Since the fluid to be compressed flows into the intake port 1111 and is discharged to the discharge port 1121, the inverter module 1200 disposed close to the intake port 1111 may be described as being coupled to the front side of the compression module 1100.

The appearance of the compression module 1100 may be formed by the main housing 1110 and the rear housing 1120.

The main housing 1110 has a hollow cylinder, a polygonal column, or an equivalent appearance. The main housing 1110 of the main housing may be arranged to extend in the lateral direction. Both ends of the main housing 1110 may be partially or partially opened. For example, the front end of the main housing 1110 is opened, and the rear end of the main housing 1110 is partially opened. Here, the front end of the housing 1110 refers to the end coupled with the inverter module 1200. And the rear end of the housing 1110 refers to the end that is coupled to the rear housing 1120.

The inner and outer diameters of the main housing 1110 may not be constant. For example, as shown in Figure 1, the front end and the rear end may have a larger outer diameter than the intermediate portion between the front end and the rear end.

An intake port 1111 and a mount portion 1112 are formed on the outer circumferential surface of the main housing 1110.

The intake port 1111 forms a flow path that supplies the fluid to be compressed to the internal space of the electric compressor 1000. The intake port 1111 may protrude from the outer circumferential surface of the main housing 1110. The intake port 1111 may be connected to an intake pipe (not shown) that supplies the fluid to be compressed to the electric compressor 1000. The intake port 1111 has a shape corresponding to the suction tube to be coupled to the suction tube.

The mount portion 1112 is a configuration for fixing the electric compressor 1000 to the installation target area. The mount portion 1112 may protrude from the outer circumferential surface of the main housing 1110. The mount portion 1112 may protrude along the circumferential direction of the main housing 1110. The mount portion 1112 may extend along a tangential direction of the outer circumferential surface of the main housing 1110.

The mount portion 1112 may include a fastening member coupling hole 1112a that can be coupled to any fastening member. The fastening member coupling hole 1113a may be opened toward the tangential direction of the outer circumferential surface of the main housing 1110. The mount portion 1112 may be formed on one side and the other side of the main housing 1110, respectively. For example, in FIG. 1, the mounts 1112 are formed on the left and right or top and bottom of the main housing 1110, respectively.

The rear housing 1120 is installed on the other side of the main housing 1110 or the rear side of the main housing 1110. The rear housing 1120 may be formed to cover the rear end of the main housing 1110.

The rear housing 1120 includes a discharge port 1121 and a mount portion 1122.

The discharge port 1121 forms a flow path for discharging the compressed fluid from the electric compressor 1000 to the outside. The discharge port 1121 may protrude from the outer circumferential surface of the rear housing 1120. The discharge port 1121 may be connected to a discharge pipe (not shown) that supplies compressed fluid to a next device in a refrigeration cycle. The discharge port 1121 has a shape corresponding to the discharge pipe so as to be combined with the discharge pipe.

The mount portion 1122 is formed on the rear outer surface of the rear housing 110. The mount portion 1122 may protrude from the rear outer surface of the rear housing 110. The mount portion 1122 may extend in the vertical direction. The mount portion 1122 serves substantially the same as the mount portion 1112 of the main housing 1110.

The main housing 1110 and the rear housing 1120 may be coupled to each other by a plurality of fastening members 1123. The fastening member 1123 is inserted from the rear housing 1120 side toward the main housing 1110 side. A plurality of fastening members 1123 may be installed along the circumference of the rear housing 1120.

The exterior of the inverter module 1200 is formed by the inverter housing 1210 and the inverter cover 1220.

The inverter housing 1210 and the inverter cover 1220 are coupled to each other and form a mounting space such as circuit components.

The inverter housing 1210 is disposed at the front end of the electric compressor 1000. One surface of the inverter housing 1210 is disposed to face the front of the electric compressor 1000, and forms an outer wall of the electric compressor 1000. The inverter housing 1210 has a side wall, and the side wall protrudes toward the inverter cover 1220 along an edge of the one surface. The inverter housing 1210 may have an outer peripheral surface larger than the outer peripheral surface of the main housing 1110.

The inverter cover 1220 is coupled to the inverter housing 1210. The inverter cover 1220 may be formed in a plate shape covering the opening of the inverter housing 1210 and the front end of the main housing 1110. The rim of the inverter cover 1220 may have a shape corresponding to the sidewall of the inverter housing 1210.

The inverter housing 1210 and the inverter cover 1220 are coupled to each other by a plurality of fastening members 1215. The plurality of fastening members 1215 are inserted from the inverter housing 1210 side toward the inverter cover 1220 side. The plurality of fastening members 1215 are installed at positions spaced apart from each other along the circumference of the inverter housing 1210.

The inverter cover 1220 is provided with a power connector 1241 and a communication connector 1242. The power connector 1241 and the communication connector 1242 are respectively formed to be connectable with different mating connectors. The power connector 1241 is formed to transmit power supplied from a mating connector to circuit components. The communication connector 1242 electrically transmits a control command transmitted from the outside to a circuit component so that the electric compressor 1000 is driven according to the control command.

Hereinafter, the internal configuration of the electric compressor 1000 will be described.

FIG. 2 is an exploded perspective view showing the compression module 1100 and the inverter module 1200 separated from the electric compressor 1000 illustrated in FIG. 1.

When the compression module 1100 and the inverter module 1200 are separated from each other, the motor chamber S1 is exposed through the front end 1110a of the main housing 1110.

The motor chamber S1 is formed by the combination of the main housing 1110 and the inverter cover 1220. The motor room S1 means a space in which the driving motor 1130 is installed. A sealing member such as an O-ring may be installed along the combined position of the main housing 1110 and the inverter cover 1220 for sealing the motor chamber S1.

The driving motor 1130 is installed in the motor room S1. The driving motor 1130 includes a stator 1131 and a rotor 1132.

The stator 1131 is installed along the inner circumferential surface of the main housing 1110 and is fixed to the inner circumferential surface of the main housing 1110. The stator 1131 is inserted and fixed to the main housing 1110 by shrink fit (or hot press). Therefore, it is advantageous to secure the ease of assembly work of the stator 1131 by setting the insertion depth of the stator 1131 inserted into the main housing 1110 to be small (or shallow). Furthermore, it is advantageous to set the insertion depth of the stator 1131 small to maintain the concentricity of the stator 1131 in the shrink fit process.

The rotor 1132 is installed in an area enclosed by the stator 1131. The rotor 1132 is rotated by electromagnetic interaction with the stator 1131.

The rotating shaft 1140 is coupled to the center of the rotor 1132. The rotating shaft 1140 transmits the rotational force generated by the driving motor 1130 while rotating together with the rotor 1132 to a compression unit (not shown), which will be described later. The rotating shaft 1140 is inserted and fixed to the rotor 1132 by shrink fit (or hot pressing).

The inverter cover 1220 includes a plurality of protruding coupling parts 1221 inserted around the front end 1110a of the main housing 1110. The plurality of protruding coupling portions 1221 protrude from the rear outer surface of the inverter cover 1220 toward the main housing 1110. The plurality of protruding coupling parts 1221 are formed at positions spaced apart from each other along a curve corresponding to the rim of the front end 1110a of the main housing 1110.

On the outer surface of the inverter cover 1220, an area enclosed by the protruding coupling portion 1221 exists. The area enclosed by the protruding engaging portion 1221 covers the front opening of the main housing 1110.

A rotating shaft support portion 1222 may be formed at the center of the region surrounded by the protruding coupling portion 1221 to support the rotating shaft 1140 of the compression module 1100 in the axial direction. The rotation shaft support 1222 protrudes from the rear outer surface of the inverter cover 1220 and may be formed to surround the end of the rotation shaft 1140. When a fluid such as a refrigerant is compressed in the compression module 1100, the rotating shaft 1140 receives a force toward the inverter module 1200 along the axial direction under the influence of high pressure. When the rotation shaft support unit 1222 supports the rotation shaft 1140 in the axial direction, it is possible to prevent the rotation shaft 1140 from being pushed toward the inverter module 1200.

A reinforcement rib 1223 protruding from the inverter cover 1220 may be formed around the rotation shaft support portion 1222 along a position corresponding to the rotation shaft support portion 1222 and a concentric circle. The reinforcing ribs 1223 may protrude along two or more concentric circles, or may protrude along a line corresponding to the radial direction of the concentric circles.

The three-phase power terminal 1251 of the three-phase terminal 1250 is exposed on one side of the rotation shaft support 1222. The three-phase power terminal 1251 is electrically connected to the driving motor 1130 driven by the UVW three-phase, and transmits electric power and electrical control commands of the inverter module 1200 to the driving motor 1130.

3 is an exploded perspective view of the inverter module 1200 shown in FIG. 2.

One surface 1211 of the inverter housing 1210 is disposed to face the front of the electric compressor 1000 and forms an outer wall of the electric compressor 1000. The inverter housing 1210 has a side wall 1212, and the side wall 1212 protrudes toward the rear of the electric compressor 1000 or toward the compression module 1100 along the edge of the one surface.

A fastening member through-hole 1213 for fastening the inverter housing 1210 and the inverter cover 1220 may be formed on the sidewall 1212 of the inverter housing 1210. A plurality of fastening members through holes 1213 are formed, and a plurality of fastening members through holes 1213 are formed at positions spaced apart from each other along the sidewall 1212 of the inverter housing 1210. A portion 1214 corresponding to the fastening member through hole 1213 on the one surface 1211 of the inverter housing 1210 so that the fastening member inserted into the fastening member through hole 1213 does not require an excessively long length ) May be recessed toward the rear side of the electric compressor 1000.

The inverter module 1200 includes an inverter housing 1210, an inverter cover 1220, circuit components 1230, and the like. Here, the circuit component 1230 refers to various electric components constituting an electric circuit, including a printed circuit board 1231, a capacitor 1232, and a switching element 1233. A three phase terminal 1250 may also be included in the circuit component.

The three-phase terminal 1250 is formed by a combination of a three-phase power terminal 1251 and a three-phase busbar 1252.

The three-phase power terminal 1251 includes three power pins and is exposed through the inverter cover 1220 to the motor chamber S1 of the main housing 1110. The three-phase power terminal 1251 may be connected to a counterpart provided in the driving motor 1130. In order to prevent fluids such as refrigerant from flowing into the inverter module 1200, the three-phase power terminal 1251 is connected to the inverter cover 1220 while maintaining airtightness. To this end, the three-phase power terminal 1251 may further include a sealing member or the like.

The three-phase bus bar 1252 is disposed inside the inverter module 1200. The three-phase bus bar 1252 may be installed on the printed circuit board 1231. The three-phase bus bar 1252 is formed to electrically connect three power pins provided on the three-phase power terminal 1251 to the printed circuit board 1231. To this end, the three-phase bus bar 1252 is electrically connected to three power pins provided on the three-phase power terminal 1251, and is also electrically connected to the printed circuit board 1231.

The printed circuit board 1231 is mounted inside the inverter module 1200. The printed circuit board 1231 and various devices mounted therein occupy most of the space formed by the inverter housing 1210 and the inverter cover 1220. Therefore, the volume of the inverter module 1200 is determined according to the volume of the printed circuit board 1231 and the devices mounted thereon.

The description of the printed circuit board 1231 and elements will be described with reference to FIGS. 4 and 5.

4 is a perspective view of a circuit component 1230 provided in the inverter module 1200 of FIG. 3. FIG. 5 is a side view 1231b of the circuit component 1230 provided in the inverter module 1200 of FIG. 3.

The printed circuit board 1231 has a flat plate shape. The printed circuit board 1231 has a first surface 1231a1 and a second surface 1231a2 arranged to face opposite directions. The shortest distance between the first surface 1231a1 and the second surface 1231a2 corresponds to the thickness t of the printed circuit board 1231. The thickness direction of the printed circuit board 1231 refers to a direction in which a straight line corresponding to the shortest distance between the first surface 1231a1 and the second surface 1231a2 extends.

The printed circuit board 1231 includes a side surface 1231b formed between the first surface 1231a1 and the second surface 1231a2. The side surface 1231b is formed on the printed circuit board 1231 along the outer edge.

Various elements of the inverter module 1200 are respectively mounted on the first surface 1231a1 and the second surface 1231a2 of the printed circuit board 1231. Here, the various elements are converters, inverters constituting a power conversion device, switching elements 1233, and electrical circuit patterns of the printed circuit board 1231 include the first surface 1231a1 and the second surface 1231a2. And it is formed inside the printed circuit board 1231.

The capacitor 1232 is electrically connected to the printed circuit board 1231. The capacitor 1232 functions to stabilize voltage while converting AC to DC. As the capacitor 1232, both a large capacity and a small capacity may be used, and a DC Link capacitor 1232 may be used.

Since the volume of the capacitor 1232 is the largest among the circuit components 1230 of the inverter module 1200, the size and arrangement of the capacitor 1232 determines the thickness of the inverter module 1200. The thickness of the inverter module 1200 refers to a distance between one surface of the inverter housing 1210 and the inverter cover 1220.

The capacitor 1232 has a cylindrical or polygonal shape. Therefore, the shape and arrangement of the capacitor 1232 can be described based on the bottom and side surfaces of a cylindrical or polygonal column. In the present invention, the bottom surface 1232a1 of the capacitor 1232 corresponding to the bottom surface of the cylinder or the polygonal column is arranged to face the side surface 1231b of the printed circuit board 1231. Therefore, in the thickness direction of the printed circuit board 1231, the printed circuit board 1231 and the capacitor 1232 are disposed at positions not overlapping each other.

According to the arrangement of the capacitor 1232, the capacitor 1232 may be described as being divided into an intermediate portion (c), one side portion (s1), and the other portion (s2). FIG. 5 shows a state when the side surface 1231b of the printed circuit board 1231 is viewed.

When looking at the side surface 1231b of the printed circuit board 1231 as shown in FIG. 5, the middle portion c is a portion overlapping the printed circuit board 1231. In addition, one side portion s1 is a portion protruding in a semi-cylindrical shape, which is divided from the middle portion c toward the direction in which the first surface 1231a1 of the printed circuit board 1231 faces. Finally, the other side portion s2 is a portion protruding in a semi-cylindrical shape, which is divided from the middle portion c toward the direction in which the second surface 1231a2 of the printed circuit board 1231 faces. Since the first surface 1231a1 and the second surface 1231a2 are disposed to face in opposite directions, the protruding direction of the one side portion s1 and the protruding direction of the other portion s2 also face the opposite directions.

Due to the arrangement of the capacitor 1232, the thickness of the circuit component 1230 disposed in the inverter module 1200 is reduced than in the prior art. In the cylindrical or polygonal shaped capacitor 1232, the diameter of the base 1232a1 or the length of one side is generally smaller than the height of the cylinder or the height of the polygonal column. Therefore, the structure in which the capacitor 1232 is laid down is thinner than the structure in which the capacitor 1232 is erected and mounted on the first surface 1231a1 or the second surface 1231a2 of the printed circuit board 1231. Have

In addition, the present invention has a thinner circuit component 1230 thickness compared to the structure of the prior patent document No. 10-2017-0067451 (2017.06.16.). For example, in the present invention, since the printed circuit board 1231 and the capacitor 1232 overlap each other in the direction toward the side surface 1231b of the printed circuit board 1231, the printed circuit board 1231 is the thickness of the circuit component 1230. It is not included in the calculation. For example, the thickness of the circuit component 1230 embedded in the inverter module 1200 is determined by the diameter of the capacitor 1232 (when the capacitor is cylindrical) or the length of one side (when the capacitor is polygonal).

On the other hand, in the prior patent document No. 10-2017-0067451 (2017.06.16.), Since the capacitor is mounted on one side of the printed circuit board, both the size of the capacitor and the thickness of the printed circuit board are calculated for the thickness of the circuit parts. Is included in. Moreover, in the patent document, since the capacitor housing is an essential structure, it should be included in calculating the thickness of circuit components up to the thickness of the capacitor housing. Therefore, the structure of the present invention has a thinner thickness than the structure of the patent document.

This arrangement of the capacitor 1232 not only simply reduces the thickness of the circuit component 1230, but also extends the life of the capacitor 1232. If a capacitor is mounted on one side of the printed circuit board as in the structure of the prior patent document, heat generated in the electrical circuit pattern of the printed circuit board is transferred to the capacitor. Even if the capacitor housing is disposed between the capacitor and the printed circuit board, heat is conducted through the capacitor housing, unless the thermal conductivity of the capacitor housing is zero. In addition, since the electrical circuit pattern and the capacitor of the printed circuit board 1231 are disposed relatively close to each other, heat may be transferred from the electrical circuit pattern to the capacitor through a convection mechanism. If the heat is conducted to a weak capacitor, the life of the capacitor is shortened.

In contrast, in the present invention, since the capacitor 1232 is disposed at a position not overlapping with the first surface 1231a1 or the second surface 1231a2 in the thickness direction of the printed circuit board 1231, heat conduction through the heat conductor is fundamental. Can be blocked. In particular, if the bottom surface 1232a1 of the capacitor 1232 and the side surface 1231b of the printed circuit board 1231 are spaced apart from each other, the electrical circuit pattern of the printed circuit board 1231 opens to the bottom surface 1232a1 of the capacitor 1232. This direct conduction can be fundamentally blocked.

Furthermore, in the present invention, since the electrical circuit pattern and the capacitor 1232 of the printed circuit board 1231 are relatively far compared to the conventional structure, the effect of heat transferred through the convection mechanism is also smaller than in the prior art. Therefore, according to the structure of the present invention, the life of the capacitor 1232, which is greatly affected by temperature, is increased.

The capacitor 1232 includes a first terminal 1232c1 and a second terminal 1232c2 formed on the bottom surface 1232a1. The first terminal 1232c1 and the second terminal 1232c2 correspond to a (+) pole terminal and a (-) pole terminal, respectively. The first terminal 1232c1 and the second terminal 1232c2 protrude from a position spaced apart from each other. The first terminal 1232c1 is connected to an electrical circuit pattern formed on the first surface 1231a1 of the printed circuit board 1231, and the second terminal 1232c2 is a second surface 1231a2 of the printed circuit board 1231. It is connected to the electrical circuit pattern formed on.

The gap between the first terminal 1232c1 and the second terminal 1232c2 in the thickness direction of the printed circuit board 1231 is the same as the thickness t of the printed circuit board 1231. If not limited to the thickness direction of the printed circuit board 1231, the distance between the first terminal 1232c1 and the second terminal 1232c2 may be greater than the thickness t of the printed circuit board 1231. Even if that is the case, even if the printed circuit board 1231 is placed between the first terminal 1232c1 and the second terminal 1232c2 and the capacitor 1232 is rotated in place, the first terminal 1232c1 is the printed circuit board 1231 Is in contact with the first surface 1231a1, and the second terminal 1232c2 is in contact with the second surface 1231a2 of the printed circuit board 1231. Accordingly, an interval between the first terminal 1232c1 and the second terminal 1232c2 in the thickness direction of the printed circuit board 1231 may be the same as the thickness t of the printed circuit board 1231. However, in this case, the first terminal 1232c1 and the second terminal 1232c2 are formed at positions not overlapping each other in the thickness direction of the printed circuit board 1231.

If the distance between the first terminal 1232c1 and the second terminal 1232c2 in the thickness direction of the printed circuit board 1231 is the same as the thickness t of the printed circuit board 1231, the first terminal 1232c1 and the first The two terminals 1232c2 may contact the electrical circuit pattern of the first surface 1231a1 and the electrical circuit pattern of the second surface 1231a2, respectively, even if they protrude only in one direction. For example, the first terminal 1232c1 and the second terminal 1232c2 may be respectively connected to the electrical circuit pattern of the first surface 1231a1 and the electrical circuit pattern of the second surface 1231a2, respectively, without having a bent portion. This structure has an advantage over the structure of the prior patent document No. 10-2017-0067451 (2017.06.16.).

In the patent document, it can be confirmed that the lead wire protruding from the laid capacitor is shown to be bent once to be connected to the printed circuit board. The bending structure of such a lead wire causes its length to increase. In addition, an increase in the length of the lead wire results in an increase in the electrical resistance component, an increase in electrical loss, and an increase in heat generation.

In contrast, in the structure of the present invention, since the first terminal 1232c1 and the second terminal 1232c2 do not have a bent portion, the lengths of the first terminal 1232c1 and the second terminal 1232c2 may be relatively short. Therefore, the structure of the present invention has the effect of reducing the electrical resistance component, reducing electrical loss and reducing heat generation compared to the structure of the prior patent document.

In particular, as the current flowing through the circuit component increases, the thickness of the lead wire becomes larger, so that the lead wire may be disconnected due to bending. However, since the structure of the present invention does not require bending processing of the first terminal 1232c1 and the second terminal 1232c2, there is also an effect of preventing disconnection of the first terminal 1232c1 and the second terminal 1232c2.

Meanwhile, the first terminal 1232c1 and the second terminal 1232c2 may be formed at positions symmetrical to each other based on the printed circuit board 1231. In this case, the interval between the first terminal 1232c1 and the second terminal 1232c2 is the same as the thickness t of the printed circuit board 1231 regardless of the direction, and overlaps each other in the thickness direction of the printed circuit board 1231 It is formed in the position. When looking at the printed circuit board 1231 from the side surface 1231b of the printed circuit board 1231, one part s1 and the other part s2 of the capacitor 1232 may be symmetrical to each other. This structure is shown in FIG. 5.

If the first terminal 1232c1 and the second terminal 1232c2 are formed at symmetrical positions with respect to the printed circuit board 1231, the first terminal 1232c1 and the second terminal 1232c2 are printed circuit boards 1231 ) In addition to being connected and fixed to the electrical circuit pattern by soldering, there is an additional fixing effect. For example, the printed circuit board 1231 may be interposed between the first terminal 1232c1 and the second terminal 1232c2 in an interference-fitting manner, thereby connecting and fixing the capacitor 1232 and the printed circuit board 1231 to each other. It works.

The printed circuit board 1231 may include an accommodating portion A formed to accommodate the capacitor 1232. The side surface 1231b of the printed circuit board 1231 is formed in a shape corresponding to the side wall of the inverter housing 1210, and a portion of the side surface 1231b is recessed to form the receiving portion A have. For example, it can be understood that a place where a part of the printed circuit board 1231 is to be originally assigned is allocated to the arrangement area of the capacitor 1232. Since the integrated technology of the printed circuit board 1231 continues to develop, such a structure is possible.

The capacitor 1232 is inserted into the receiving portion A along a direction orthogonal to the thickness direction of the printed circuit board 1231. The direction orthogonal to the thickness direction of the printed circuit board 1231 refers to the normal direction of the side surface 1231b of the printed circuit board 1231.

When the capacitor 1232 is disposed in the accommodating portion A, the periphery of the accommodating portion A partially surrounds the capacitor 1222. Since the thickness t of the printed circuit board 1231 is thinner than the diameter of the capacitor 1232, the accommodating portion A of the printed circuit board 1231 can wrap the capacitor 1232 in four directions. However, since one of the four directions is an insertion direction of the capacitor 1232, as a result, the receiving portion A wraps the capacitor 1232 in up to three directions.

The side surface 1231b of the printed circuit board 1231 includes a first side surface 1231b1, a second side surface 1231b2, and a third side surface 1231b3 corresponding to the circumference of the receiving portion A.

The first side 1231b1 is disposed to face the bottom surface 1232a1 of the capacitor 1232 corresponding to the bottom surface of the cylinder or the bottom surface of the polygonal column. The first side 1231b1 is disposed in the insertion direction of the capacitor 1232.

The second side 1231b2 is connected to one end of the first side 1231b1. The second side surface 1231b2 is disposed to face the side surface 1232b of the capacitor 1232 corresponding to the side surface of the cylinder or the side surface of the polygonal column from one side.

The third side 1231b3 is connected to the other end of the first side 1231b1. The third side surface 1231b3 is arranged to face the side surface 1232b of the capacitor 1232 corresponding to the side surface of the cylinder or the side surface of the polygonal column from the other side. The second side 1231b2 and the third side 1231b3 are disposed to face each other.

Such a structure allows the position of the capacitor 1232 to be fixed when the capacitor 1232 receives an impact or external force along the direction in which the side surface 1231b of the printed circuit board 1231 faces. For example, the second side 1231b2 and the third side 1231b3 serve as a guard to prevent the capacitor 1232 from being separated. In addition, such a structure is easy to additionally secure the capacitor 1232 or the capacitor assembly G to the printed circuit board 1231 through a housing, which will be described later. This will be described later.

On the other hand, when a plurality of capacitors 1232 is provided, a capacitor assembly G is formed. The capacitor assembly G refers to a plurality of capacitors 1232 arranged in a country. The first side surface 1231b1 is disposed to face the bottom surface 1232a1 of each capacitor 1232. The second side surface 1231b2 is disposed to face the side surface 1232b of the capacitor 1232 disposed at one end of the capacitor assembly G. The third side surface 1231b3 is disposed to face the side surface 1232b of the capacitor 1232 disposed at the other end of the capacitor assembly G. It is the same as described above that the second side 1231b2 and the third side 1231b3 serve as a guard for the capacitor assembly G.

Next, an embodiment further comprising a housing 1260 will be described.

6 is a perspective view showing a state before coupling the housing 1260 of the circuit component 1230 further comprising a housing 1260. 7 is a perspective view showing a state after the housing 1260 of the circuit component 1230 further comprising a housing 1260.

The rest of the structure, except for the housing 1260, is the same as the embodiment described above. Therefore, the rest of the structure is replaced by the previous description.

The housing 1260 is formed to accommodate the capacitor 1232 or the capacitor assembly G. For example, the housing 1260 is formed to surround one of the two bottoms 1232a1 and 1232a2 of the capacitor 1232 corresponding to the bottom of the cylinder or the bottom of the polygonal column. In addition, the housing 1260 is formed to surround the side surface 1232b of the capacitor 1232 corresponding to the side surface of the cylinder or the side surface of the polygonal column.

The housing 1260 includes a protection part 1261 and a fixing part 1262.

The protection unit 1261 is formed to surround the capacitor 1232 or the capacitor assembly G. The protection unit 1261 may have a hollow cylindrical shape or a hollow polygonal shape to accommodate the capacitor 1232, and one of the two bottom surfaces is blocked and the other is opened. The opened portion is disposed in a direction in which the capacitor 1232 is inserted into the housing 1260.

When the capacitor 1232 fails, one of the two bottom surfaces 1232a1 and 1232a2 of the capacitor 1232 bursts, and the electrolyte leaks. Here, the two bottom surfaces 1232a1 and 1232a2 of the capacitor 1232 refer to the surface 1232a1 on which the first terminal 1232c1 and the second terminal 1232c2 are formed, and the opposite surface 1232a2, which is a capacitor ( The side that pops up when 1232) fails is primarily the opposite side 1232a2. When the protection unit 1261 surrounds the capacitor 1232, the electrolyte is temporarily stored in the protection unit 1261. Therefore, it is possible to prevent the electrolyte from flowing through the first terminal 1232c1 or the second terminal 1232c2 to the printed circuit board 1231 by the protection unit 1261.

The fixing portion 1262 is formed to fix the capacitor 1232 to the printed circuit board 1231. The fixing portions 1262 respectively protrude from both ends of the protecting portion 1261. The fixing portion 1262 is formed to interview at least one of the first surface 1231a1 and the second surface 1231a2 of the printed circuit board 1231. In addition, a fastening hole 1262a is formed in the fixing part 1262, and the fastening hole 1262a is disposed at a position corresponding to a fastening hole (not shown) of the printed circuit board 1231. When a fastening member (not shown) is coupled to the fastening hole of the fixing part 1262 and the fastening hole of the printed circuit board 1231, the fastening part 1262 may be fixed to the printed circuit board 1231.

When the housing 1260 surrounds the capacitor assembly G, the protection unit 1261 may be provided as many as the number corresponding to the number of the capacitors 1232. In addition, slits 1263 may be formed at positions corresponding to two capacitors 1232. The position corresponding between the two capacitors 1232 is the same as the position corresponding between the two protection parts 1261. The slit 1263 is formed along the height direction of the capacitor 1232 corresponding to the height direction of the cylinder or the height direction of the polygonal column. Heat generated in the side surface 1232b of the capacitor 1232 may be discharged to the outside of the housing 1260 through the slit 1263.

The housing 1260 may be formed of a material having low thermal conductivity to suppress thermal conductivity. In addition, the housing 1260 may be formed of a material having elasticity. For example, the housing 1260 may be formed of a material such as silicone, rubber, or elastomer.

The electric compressor described above is not limited to the configuration and method of the above-described embodiments, but the above-described embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made.

The present invention may be variously implemented or applied in the industrial field of producing and using an electric compressor.

Claims

A compression module formed to compress the fluid; And

Including an inverter module formed to control the driving of the compression module,

The inverter module,

The printed circuit board having first and second surfaces disposed to face opposite directions, and having a side surface formed between the first surface and the second surface along an outer edge of the printed circuit board; And

It includes a capacitor of a cylindrical or polygonal shape that is electrically connected to the printed circuit board,

The motor-driven compressor, characterized in that the bottom of the cylinder or the bottom of the capacitor corresponding to the bottom of the polygonal column is arranged to face the side of the printed circuit board.
According to claim 1,

The capacitor based on looking at the side of the printed circuit board,

An intermediate portion overlapping the printed circuit board;

A side portion protruding from the intermediate portion toward a direction in which the first surface of the printed circuit board faces; And

And a second portion protruding from the intermediate portion toward a direction in which the second surface of the printed circuit board faces, so as to protrude in a direction opposite to the protruding direction of the one portion.
According to claim 2,

The electric compressor of claim 1, wherein the shape of the one side portion and the shape of the other portion are symmetrical with respect to each other when the printed circuit board is viewed from the lateral direction of the printed circuit board.
According to claim 1,

The capacitor has a first terminal and a second terminal protruding from each other spaced apart from the bottom surface,

The first terminal is connected to an electrical circuit pattern formed on the first surface of the printed circuit board, and the second terminal is connected to an electrical circuit pattern formed on the second surface of the printed circuit board. Motorized compressor.
The method of claim 4,

The distance between the first terminal and the second terminal in the thickness direction of the printed circuit board, the electric compressor, characterized in that the same as the thickness of the printed circuit board.
The method of claim 4,

Each of the first terminal and the second terminal is an electric compressor, characterized in that it protrudes only in one direction.
The method of claim 4,

The first terminal and the second terminal are electric compressors, characterized in that formed at positions symmetrical to each other with respect to the printed circuit board.
The method of claim 4,

The first terminal and the second terminal is an electric compressor, characterized in that formed in a position that does not overlap with each other in the thickness direction of the printed circuit board.
According to claim 1,

The printed circuit board has a receiving portion formed to accommodate the capacitor,

The capacitor is inserted into the receiving portion along a direction orthogonal to the thickness direction of the printed circuit board,

The periphery of the receiving portion is characterized in that the electric compressor is formed to partially surround the capacitor.
The method of claim 9,

The side surface of the printed circuit board has a first side surface, a second side surface and a third side surface corresponding to the circumference of the receiving portion,

The first side surface is disposed to face the bottom surface of the capacitor corresponding to the bottom surface of the cylinder or the polygonal column,

The second side surface is connected to one end of the first side surface and is arranged to face the side surface of the capacitor corresponding to the side surface of the cylinder or the polygonal column from one side,

The third side is connected to the other end of the first side, the electric compressor, characterized in that arranged to face the side of the capacitor corresponding to the side of the cylinder or the side of the polygonal column from the other side.
The method of claim 10,

The capacitors are provided in plural to form a capacitor assembly and arranged side by side,

The first side is disposed to face the bottom of each capacitor,

The second side surface is disposed to face the side surface of the capacitor disposed at one end of the capacitor assembly,

The third side is an electric compressor, characterized in that arranged to face the side of the capacitor disposed on the other end of the capacitor assembly.
According to claim 1,

The capacitors are provided in plural to form a capacitor assembly and arranged side by side,

The electric compressor further includes a housing formed to receive the capacitor assembly,

The housing is formed to surround one of the two bottoms of the capacitor corresponding to the bottom of the cylinder or the bottom of the polygon, and the side of the cylinder or the side of the capacitor corresponding to the side of the polygon. Motorized compressor.
The method of claim 12,

The housing is provided with a fixing portion that protrudes from both ends,

The fixing portion is formed to interview at least one of the first surface and the second surface of the printed circuit board, and a fastening hole corresponding to the fastening hole of the printed circuit board is coupled to the printed circuit board by a fastening member. Electric compressor, characterized in that provided.
The method of claim 12,

The housing is provided with a protective portion formed to surround the capacitor,

The protection unit is provided with the number of capacitors provided in the capacitor assembly,

A slit is formed between the two protection parts,

The slit is an electric compressor, characterized in that formed in the height direction of the capacitor corresponding to the height direction of the cylinder or the height of the polygonal column.
According to claim 1,

An electric compressor, characterized in that the bottom surface of the capacitor and the side surface of the printed circuit board are spaced apart from each other.