JP5416388B2 - Inverter-integrated electric compressor - Google Patents

Description

  The present invention relates to an inverter-integrated electric compressor in which a motor drive circuit including an inverter is assembled in a compressor, and particularly to an inverter-integrated electric compressor in which an inverter portion is molded with urethane resin or the like.

As a structure of an inverter-integrated electric compressor in which a motor drive circuit including an inverter is assembled in a compressor, a structure in which the motor drive circuit is covered with an insulating resin mold material and embedded in the resin mold material. Known (for example, Patent Document 1). The lead wire for inputting a high voltage to the inverter part of such a compressor is connected to the circuit board of the inverter part via a high voltage connector (HV connector) composed of a crimp terminal, for example. Connected with the part.
JP 2002-70743 A

  In the inverter-integrated electric compressor described in Patent Document 1, a molding material such as urethane resin is filled in the space that houses the motor drive circuit in order to protect the components that constitute the inverter unit from heat and vibration. ing. However, if the molding material flows into the gap between the conductive wires in the caulking portion of the HV connector during this filling operation, the molding material expands due to a change in the temperature of the HV connector due to a change in the operating state of the compressor. There is a risk that the connection reliability at the crimped portion of the HV connector is lowered due to repeated contraction.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an inverter-integrated electric compressor in which an inverter part is molded with urethane resin or the like and which has excellent electrical connection part joining reliability.

In order to solve the above-described problems, an inverter-integrated electric compressor according to the present invention includes a motor, and a motor drive circuit including the inverter is provided in a housing space surrounded by the compressor housing, and is mounted on a vehicle. In the inverter-integrated electric compressor, the crimping portion of the terminal of the conductive wire connected to the inverter is molded together with the inverter by the resin filled in the housing space, and the open clearance to the outside in the crimping portion is It is previously coated and sealed with a gap sealing material made of solder, and the tip cross-sectional portion of the conducting wire is covered with the gap sealing material .

  The inverter-integrated electric compressor of the present invention is molded together with the inverter in a state in which the open gap to the outside of the crimped portion of the terminal of the lead wire connected to the inverter is covered or sealed with a gap sealing material. The molding material does not flow into the internal gap of the crimping portion, and the connection reliability of the crimping portion is ensured. As the gap sealing material, it is preferable to use a material having a small degree of expansion or contraction due to a temperature change of the HV connector. By using such a material, it is possible to sufficiently secure the connection reliability of the caulking portion.

Further, in order to efficiently cover and seal the inside of the open gap with the gap sealing material, the gap sealing material is temporarily in a fluid state by heating or the like and solidified by cooling or the like. a material that Ru using. Specifically, a gap sealing material made of solder can be suitably used. For example, the solder is temporarily made to flow with a heated soldering iron, and in this state, the solder is allowed to flow into the opening gap, and the solder is solidified by natural cooling or forced cooling. It is possible to efficiently achieve gap covering and sealing.

In the present invention, even if the inside of the open gap is covered and sealed, if the tip cross-sectional portion of the conducting wire is exposed, the molding material attached to the irregularities of the tip cross-sectional portion repeatedly expands and contracts. As a result, stress is applied to the tip of the conducting wire, and the connection reliability of the caulking portion may be reduced. Therefore, so as to cover the irregularities of the distal section of the wire, the tip cross-section of the conductors Ru covered by the gap sealing material.

The inverter-integrated electric compressor according to the present invention can be applied to virtually any type of compressor, but is often mounted in a narrow space, and the motor drive circuit is affected by heat and vibration. cheap, Ru have use as a compressor, which is mounted on a vehicle.

  According to the inverter-integrated electric compressor according to the present invention, the compressor is configured in such a manner that the open gap to the outside of the crimped portion of the terminal of the conductive wire connected to the inverter is covered and sealed with the gap sealing material in advance. Since the housing space surrounded by the housing is molded with the inverter, the molding material will not enter the crimped part of the terminal of the lead wire connected to the inverter, ensuring the connection stability and connection reliability of the crimped part. Is possible.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows an example of a scroll-type electric compressor for a vehicle air conditioner as a basic configuration of an inverter-integrated electric compressor 1 according to an embodiment of the present invention. In FIG. 1, reference numeral 2 denotes a compression mechanism composed of a fixed scroll 3 and a movable scroll 4. The movable scroll 4 is turned with respect to the fixed scroll 3 in a state in which the rotation is prevented via the ball coupling 5. A motor 7 is incorporated in the compressor housing (center housing) 6, and the main shaft 8 (rotary shaft) is rotationally driven by the built-in motor 7. The rotational motion of the main shaft 8 is converted into the turning motion of the movable scroll 4 via the eccentric pin 9 disposed on one end side of the main shaft 8 and the eccentric bush 10 rotatably engaged with the eccentric pin 9. ing. In this embodiment, a suction port 11 for sucking refrigerant as a fluid to be compressed is provided in the compressor housing (front housing) 12, and the sucked refrigerant is guided to the compression mechanism 2 through the motor 7 arrangement portion. The refrigerant compressed by the compression mechanism 2 is sent to the external circuit through the discharge port 13, the discharge chamber 14, and the discharge port 16 provided in the compressor housing (rear housing) 15.

  The driving circuit 21 for the motor 7 is provided in the compressor housing 12 (front housing), and more specifically, on the outer surface side of the partition wall 22 with the refrigerant suction path side formed in the compressor housing 12. A motor drive circuit 21 is provided. The motor drive circuit 21 supplies power to the motor 7 via a sealed terminal 23 (an output terminal of the motor drive circuit 21) attached through the partition wall 22 and a lead wire 24. The path side and the motor drive circuit 21 installation side are sealed. By providing the motor drive circuit 21 on the outer surface side of the partition wall 22, at least a part of the electrical components including the motor drive circuit 21 can exchange heat with the suction refrigerant via the partition wall 22. The cooling is possible.

  The motor drive circuit 21 includes an IPM (Intelligent Power Module) 25 having an inverter function and a control circuit 26, and an electrical component such as a capacitor 27 is provided separately or integrally therewith. The motor drive circuit 21 is connected to an external power source (not shown) via a connector 28 as an input terminal. The opening side to the outside of the compressor housing 12 on which the electric parts including the motor drive circuit 21 are mounted is covered in a state of being sealed with a lid member 29, and these electric parts are protected by the lid member 29. .

  An example of the configuration as described above is shown in FIG. In FIG. 2, the electric compressor 1 is provided with a motor drive circuit 21, and an output from the motor drive circuit 21 is fed to each motor winding 41 of the built-in motor 7 via a sealing terminal 23 and a lead wire 24. As a result, the motor 7 is rotationally driven, and the compression mechanism 2 performs compression. The motor drive circuit 21 includes a motor drive high voltage circuit 30 and a control low circuit provided with a motor control circuit 44 for controlling each power element 43 (switching element) of the inverter 42 in the motor drive high voltage circuit 30. A voltage circuit 45 is provided, and the control low voltage circuit 45 is configured in the control circuit 26 shown in FIG. Electric power from an external power supply 46 (for example, a battery) is supplied to the motor driving high voltage circuit 30 through the high voltage connector 47 and supplied to the inverter 42 via the noise filter 37 and the smoothing capacitor 27. Then, the direct current from the power source 46 is converted into a pseudo three-phase alternating current and then supplied to the motor 7. For example, low voltage power is supplied to the motor control circuit 44 via a control signal connector 49 from an air conditioning control device 48 of the vehicle. In FIG. 2, the control signal connector 49 and the high voltage connector 47 are illustrated at positions apart from each other, but actually they are provided in the same connector 28 shown in FIG. 1. A shield plate 31 is fixed to the control circuit 26, and the shield plate 31 is interposed between the motor driving high voltage circuit 30 and the control circuit 26 having the control low voltage circuit 45 as shown in FIG. Thus, the motor driving high voltage circuit 30 is covered as much as possible to suppress the influence of noise from the motor driving high voltage circuit 30 to the control low voltage circuit 45 side.

  FIG. 3 is a perspective view showing a state in which the motor drive circuit 21 is housed in the housing space 60 surrounded by the compressor housing (front housing) 12 in the compressor 1 of FIG. 1. A case member 58 and an IPM 25 are accommodated in the accommodation space 60. A high voltage connector 47 formed of a crimp terminal is caulked to the tip of the lead wire 24. The high voltage connector 47 is fixed to the case member 58 with screws, and is electrically connected between the noise filter 37 and the capacitor 27 installed on the back surface of the case member 58.

  4A and 4B show a caulking portion for connecting the high voltage connector 47 and the lead wire 24 shown in FIG. 3. FIG. 4A is a perspective view showing a state in which the caulking portion is not covered, and FIG. It is a perspective view of the state coat | covered with. In FIG. 4A, the high voltage connector 47 is caulked to the lead wire 24. In the caulking portion 61, the plurality of conductive wires 62 bundled by covering the lead wires 24 form an open gap 63 to the outside, and when a molding material made of urethane resin or the like enters the open gap 63, the caulking portion The connection reliability of 61 is lowered. Therefore, as shown in FIG. 4B, solder 64 as a gap sealing material is caused to flow into the open gap 63, and in this state, the molding material is filled into the accommodation space 60 of FIG. By molding, the molding material is prevented from flowing into the caulking portion 61. In particular, as shown in FIG. 4B, the tip cross-section portion of the conducting wire 62 is completely covered with the solder 64 so that the connection reliability of the caulking portion 61 is sufficiently ensured even when the molding material adheres to this portion. It becomes possible to do.

  The inverter-integrated electric compressor according to the present invention can be applied to virtually any type of compressor, but is often mounted in a narrow space, and the motor drive circuit is affected by heat and vibration. It is easy to use as a compressor mounted on a vehicle.

It is a schematic longitudinal cross-sectional view which shows the basic composition of the inverter integrated electric compressor which concerns on one embodiment of this invention. It is the block diagram which showed the air-conditioning control mechanism containing the compressor of FIG. It is a perspective view which shows the state in which the motor drive circuit was accommodated in the accommodation space enclosed with the front housing of FIG. FIGS. 3A and 3B show a caulking portion that connects the HV connector of FIG. 3 and a lead wire, FIG. 3A is a perspective view in an uncovered state, and FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inverter integrated electric compressor 2 Compression mechanism 3 Fixed scroll 4 Movable scroll 5 Ball coupling 6 Compressor housing (center housing)
7 Motor 8 Main shaft 9 Eccentric pin 10 Eccentric bush 11 Suction port 12 Compressor housing (front housing)
13 Discharge hole 14 Discharge chamber 15 Compressor housing (rear housing)
16 Discharge port 21 Motor drive circuit 22 Partition wall 23 Sealed terminal 24 Lead wire 25 IPM
26 Control circuit 27 Capacitor 28 Connector 29 Lid member 30 Motor drive high voltage circuit 31 Shield plate 37 Noise filter 41 Motor winding 42 Inverter 43 Power element 44 Motor control circuit 45 Control low voltage circuit 46 External power supply 47 High voltage connector (HV connector)
48 Air-conditioning control device 49 Control signal connector 58 Case member 60 Accommodating space 61 Caulking portion 62 Lead wire 63 Opening gap 64 Solder as gap sealing material

Claims (2)

In an inverter-integrated electric compressor mounted in a vehicle, in which a motor drive circuit including an inverter is provided and a motor drive circuit including an inverter is provided in a housing space surrounded by a compressor housing, caulking of terminals of conductive wires connected to the inverter And the inverter is molded with the resin filled in the housing space, and the open gap to the outside of the crimped portion is previously covered and sealed with a gap sealing material made of solder, and the tip of the conducting wire An inverter-integrated electric compressor characterized in that a cross-sectional portion is covered with the gap sealing material . The outer periphery of the conducting wire is covered with the crimping portion of the terminal and the covering portion of the lead wire, and the open cross section of the leading end of the conducting wire and the open clearance to the outside are completely covered with the gap sealing material. The inverter-integrated electric compressor according to claim 1.

Images