JP2015014203A - Electric circuit vibration resistance structure of electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration resistance structure of an electric circuit which can be reduced in the weight, improved in productivity and reduced in cost of a compressor by applying reinforcing processing mainly to a point which is high in a reinforcing effect, in the inverter-integrated electric compressor.SOLUTION: In an electric circuit vibration resistance structure of an electric compressor which is used in an air conditioner of a vehicle, and integrally has a motor for driving a compressor mechanism, and an electric circuit for controlling the drive of the motor, an end at a side apart from a base board of an electronic component which is attached to a base board of the electric circuit, and required in the reinforcement of vibration resistance is fixed to a part of a member adjoining the end with an adhesive 25. By this constitution, vibration resistance can be secured, a use amount of the adhesive is suppressed, and the weight reduction, the improvement of productivity and the reduction of cost of the compressor can be achieved compared with the case where a resin mold is used.

Description

  The present invention relates to a vibration-proof structure of an electric circuit in an electric compressor that is integrally provided with a motor for driving a compression mechanism used in a vehicle air conditioner and an electric circuit that controls driving of the motor.

  In an electric compressor used for a vehicle air conditioner, power supply to a motor for driving a compression mechanism is controlled while converting a direct current from a battery into an alternating current by an inverter, and an electric circuit including the inverter is incorporated. There is known an electric compressor that houses a circuit board in a compressor housing.

  In such an inverter-integrated electric compressor, an electronic device such as a noise filter for removing noise from a power supplied from an external power source or a smoothing capacitor for smoothing the power supplied to the inverter. Parts are provided. These electronic components are large, heavy, and have a high height from the circuit board mounting surface, and the end on the side away from the board is likely to swing greatly with the supporting part to the board as a fulcrum, and is susceptible to vibration.

  For this reason, conventionally, as shown in Patent Documents 1 and 2, the electronic components mounted on the circuit board are filled and molded with silicone gel or urethane resin to ensure the vibration resistance of the electronic components. Was.

JP 2006-316754 A JP 2010-133400 A

  However, in the prior art such as Patent Documents 1 and 2, since the resin circuit is filled and molded so that all the electronic components mounted on the printed circuit board are embedded in the electric circuit housing space of the compressor housing, the resin to be filled This increases the weight of the compressor and increases the cost.

Further, when the resin is cured by heating, it is necessary to heat the entire electric compressor (or the entire inverter) for a long time using a large furnace, and the productivity is also lowered.
The present invention has been made paying attention to such a conventional problem, and by applying reinforcement processing to a portion having a high reinforcing effect on an electronic component that needs to be reinforced against vibrations. An object of the present invention is to provide an electric circuit vibration-proof structure for an electric compressor that can reduce the weight, improve the productivity, and reduce the cost of the compressor.

  In order to solve the above problems, the present invention provides an electric circuit vibration proof structure for an electric compressor that is used in a vehicle air conditioner and integrally includes a motor for driving a compression mechanism and an electric circuit for driving and controlling the motor. It has the structure.

  An end portion of the electronic component that is attached to the substrate of the electric circuit and is required to be reinforced with vibration resistance is fixed to a part of a member adjacent to the end portion with an adhesive.

According to such a configuration, the end portion on the side away from the substrate, which is easy to move with respect to the vibration of the electronic component, is fixed to a part of the member adjacent to the end portion with the adhesive so that the end portion moves. It becomes a constrained structure and can secure vibration resistance.
In addition, the vibration-proof reinforcement of electronic parts only requires fixing the place where the reinforcement effect is high with an adhesive, so the amount of adhesive used can be reduced, and the weight and production of the compressor can be reduced compared to the case where a resin mold is used. Improvement and cost reduction.

Schematic of the appearance of an electric compressor according to an embodiment of the present invention Electric circuit diagram for motor drive control of electric compressor as above The top view which shows the inside of the housing which accommodates an electric circuit same as the above AA arrow sectional view of FIG. A perspective view showing a state in which a part of the electric circuit (smoothing capacitor and noise filter) is mounted on the circuit board. The perspective view which shows the bottom face of the circuit board with which a part of electric circuit same as the above was mounted | worn The right side view of FIG. 5 which shows the state which the upper end parts of the smoothing capacitor were fixed with the adhesive agent The right side view of FIG. 5 which shows the state which the upper end parts of the smoothing capacitor were fixed with the adhesive agent The right side view of FIG. 5 which shows the state which the upper end parts of the smoothing capacitor were fixed with the adhesive agent Sectional drawing which shows the state which fixed the upper end part of the smoothing capacitor to the inner wall of the housing with the adhesive agent

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows an outline of the external appearance of an electric compressor according to an embodiment of the present invention. In FIG. 1, an electric compressor 1 is divided into three housings 2A, 2B, and 2C that are fastened in series, respectively, a compression mechanism 3, a motor 4 that drives the compression mechanism 3, and the The electric circuit 5 for controlling the driving of the motor 4 is housed, and the outer opening of the housing 2C (inverter case) is closed by a lid member 6.

  The electric circuit 5 includes an inverter, a smoothing capacitor 15 that smoothes power supplied to the inverter, and a noise filter 14 that removes noise. For example, the electric circuit 5 is configured as shown in FIG.

  In FIG. 2, the output from the electric circuit 5 is supplied to each motor winding 4 a of the motor 4 through the sealing terminal 11, so that the motor 4 is rotationally driven and the compression mechanism 3 performs compression.

  The electric circuit 5 is supplied with electric power from the external power source 12 (battery) via the high voltage connector 13, and is supplied to the inverter 16 via the noise filter 14 and the smoothing capacitor 15. The direct current is converted into pseudo three-phase alternating current, and then supplied to the motor 4.

  The motor control circuit 17 is supplied with constant voltage power from a vehicle air conditioning control device 18 via a control signal connector 19. The inverter 16 is provided with a total of six power semiconductor elements 22 each including a freewheeling diode 20 and an IGBT 21.

  3 and 4 show a housing 2C that houses an electric circuit. Each electronic component constituting the inverter 16 and the motor control 17 is directly mounted on the first printed circuit board 23 or electrically connected via a lead wire.

  On the other hand, the smoothing capacitor 15 has an engine vibration such as a large size, a heavy weight, a high height from the board mounting surface, and a thin terminal of the electronic parts mounted on the board as compared with the electronic parts for motor drive control. Because it is easily affected by the vibration of the compressor itself, it is necessary to reinforce the vibration.

  Therefore, as shown in FIG. 5, the smoothing capacitor 15 and the noise filter 14 that require vibration proof reinforcement are aggregated on a dedicated second printed circuit board (circuit board) 24 separately from the first printed circuit board 23. Install.

  FIG. 6 shows the bottom surface of the second printed circuit board 24 on which electronic components are mounted. Arranged on the bottom surface of the second printed circuit board 24 so that the pitch directions of the pair of lead wires 28 of the smoothing capacitor 15 and the pair of lead wires 29 of the noise filter 14 are parallel to the long sides of the printed circuit board 24, respectively. Has been.

  Here, since each electronic component is supported on the printed circuit board by the lead wire, the electronic component having a high height from the printed circuit board mounting surface such as a smoothing capacitor has an upper end (an end on the side away from the printed circuit board). However, it is easy to shake with the support part to the substrate as a fulcrum. In particular, since the smoothing capacitor 15 is supported via the substrate 24 of the pair of lead wires 28, the upper end portion is perpendicular to the pitch direction with the linear direction (pitch direction B) connecting the pair of lead wires 28 as a fulcrum. It tends to swing in the direction C shown.

  Therefore, the upper ends of the pair of smoothing capacitors 15 that are close to each other in the C direction are fixed with an adhesive. In this manner, the assembly 26 in which the upper ends of the pair of smoothing capacitors 15 are fixed with the adhesive 25 is fixed by fastening the peripheral portion of the second printed circuit board 24 to the housing 2C with the plurality of bolts 27.

  According to the present embodiment, by fixing the upper ends of the pair of smoothing capacitors 15 that are close to each other in a direction in which they can easily move with respect to vibration, the movement in the same direction can be restrained, and vibration resistance is ensured. it can.

  Further, by using the adhesive, it is possible to reduce the weight of the compressor, improve the productivity, and reduce the cost as compared with the case where a resin mold is used. Here, in the present embodiment, the upper ends of the smoothing capacitors 15 that are close to the direction C where vibration resistance is low are fixed in consideration of the arrangement of the lead wires 28, so that the amount of the adhesive 25 used is the minimum necessary. These effects can be further enhanced.

  Furthermore, before assembling in the compressor housing, only the electronic components that need to be reinforced against vibrations are collected and the adhesive is applied in the state of the assembly mounted on the dedicated printed circuit board 24, so that the productivity is further improved. .

  7 to 9 are right side views of FIG. 5 showing a state in which the upper ends of the smoothing capacitor 15 are fixed to each other with the adhesive 25. In the application of the adhesive 25 to the smoothing capacitor 15, FIG. 7 is applied only to the top surfaces without leaching between the opposing side surfaces of the adjacent smoothing capacitor 15, and FIG. FIG. 9 shows a coating applied between the adjacent smoothing capacitors 15 without being applied to the upper surface of the smoothing capacitor 15. What is necessary is just to set the adhesion | attachment form and usage-amount of these adhesives so that vibration resistance can be ensured according to the adhesive strength characteristic of an adhesive agent, the proximity of components, etc.

  Note that the movement in the pitch direction B connecting the pair of lead wires 28 at the upper end of the smoothing capacitor 15 is suppressed to be small compared to the movement in the C direction perpendicular thereto, but from the substrate mounting surface of the smoothing capacitor 15. When the height is particularly high, or when the pitch (distance) between the pair of lead wires 28 is short, the movement in the B direction may not be sufficiently suppressed.

  In such a case, by fixing the upper ends of the smoothing capacitor 15 close to each other in the B direction with the adhesive 25, vibration resistance against vibration in the B direction can be ensured. Of course, the vibration resistance can be further improved by fixing the upper ends of the smoothing capacitor 15 that are close to each other in the C direction and the B direction with an adhesive.

  FIG. 10 shows a second embodiment. In the present embodiment, when the upper end portion of the smoothing capacitor 15 is close to the inner wall 30 of the housing 2C, the upper end portion of the smoothing capacitor 15 is fixed to the inner wall 30 of the housing 2C with the adhesive 25. Also in the present embodiment, by fixing the upper end portion of the smoothing capacitor 15 to the inner wall 30 of the housing 2C, the movement of the upper end portion can be restricted and vibration resistance can be ensured. It goes without saying that vibration resistance can be further improved if used in combination with a configuration in which the upper ends of the pair of smoothing capacitors 15 of the first embodiment are fixed together with an adhesive.

  Further, in the above embodiment, a smooth capacitor having a large size, a large weight, a high height from the substrate, and a thin terminal is shown as an electronic component that requires vibration proof reinforcement and is fixed with an adhesive, but is not limited to a smooth capacitor. In addition, the same effect can be obtained by applying to a coil or the like.

  The arrangement of the plurality of electronic components mounted on the printed circuit board is the same as that of the present embodiment as long as the arrangement is arranged in a direction perpendicular to the pitch direction of the pair of lead wires of the electronic components as shown in FIG. The vibration resistance can be improved with any type of bonding, not limited to fixing the end portions of the component away from the substrate with an adhesive.

DESCRIPTION OF SYMBOLS 1 ... Electric compressor 2C ... Housing 3 ... Compression mechanism 4 ... Motor 5 ... Electric circuit 12 ... External power supply (battery)
DESCRIPTION OF SYMBOLS 14 ... Noise filter 15 ... Smoothing capacitor 16 ... Inverter 17 ... Motor control circuit 24 ... 2nd printed circuit board 25 ... Adhesive 26 ... Assembly 27 ... Bolt 28 ... Smoothing capacitor lead wire 29 ... Noise filter lead wire 30 ... Housing Inner wall

Claims (6)

In an electric circuit vibration proof structure of an electric compressor, which is used in an air conditioner for a vehicle and integrally includes a motor for driving a compression mechanism and an electric circuit for controlling the driving of the motor.
An end of the electronic component that is mounted on the circuit board of the electrical circuit and requires vibration-proof reinforcement is fixed to a part of a member adjacent to the end with an adhesive. Electric circuit vibration-proof structure of electric compressor.   The electric of the electric compressor according to claim 1, wherein a plurality of the electronic components are mounted close to the substrate, and ends of the plurality of electronic components on the side away from the substrate are fixed with an adhesive. Circuit anti-vibration structure.   3. The electric compressor according to claim 1, wherein the electronic component requiring vibration-proof reinforcement is mounted on the dedicated board, and an assembly in which the ends are fixed with an adhesive is assembled to the compressor housing. Electric circuit anti-vibration structure.   The electric circuit vibration-proof structure of the electric compressor according to claim 1, wherein an end portion of the electronic component on the side away from the substrate is fixed to an inner wall of the compressor housing adjacent to the end portion with an adhesive.   The electric component according to any one of claims 1 to 4, wherein the electronic component is fixed with an adhesive to a member adjacent to a direction perpendicular to a pitch direction of a pair of lead wires connected to the substrate. Electric circuit vibration-proof structure of the compressor.   The electric circuit vibration-proof structure of the electric compressor according to any one of claims 1 to 5, wherein the electronic component requiring vibration-proof reinforcement is a capacitor or a coil.