JP5173374B2 - Electric compressor for in-vehicle air conditioner - Google Patents

Description

  The present invention relates to an electric compressor for an in-vehicle air conditioner configured by integrating an inverter device on the outer periphery of a housing in which an electric motor and a compression mechanism are built.

  2. Description of the Related Art In recent years, various inverter-integrated electric compressors configured by integrating an inverter device have been proposed as compressors for air conditioners mounted on vehicles. Such an inverter-integrated electric compressor for an in-vehicle air conditioner is provided with an inverter accommodating portion (inverter box) on the outer periphery of a housing in which an electric motor and a compression mechanism are built, and is supplied from a high voltage power supply unit therein. By incorporating an inverter device that converts three-phase AC power into three-phase AC power and supplies power to the electric motor via a power supply terminal (glass sealed terminal), the rotation speed of the electric compressor can be varied according to the air conditioning load (For example, refer patent document 1).

  Patent Document 1 discloses a technique for eliminating an expensive heat-resistant insulating coated cable that is used to feed power to a power feeding terminal (glass sealed terminal) that is fixed to the motor housing of the motor unit from the inverter device and protrudes to the outside. It is disclosed. This is a configuration in which the bus bar forming the AC output end of the inverter circuit is protruded in the lateral direction, the bus bar is fastened to the power supply terminal, and the external protruding portion of the power supply terminal is surrounded by the circuit component storage chamber. An expensive power supply cable, cable protection tube, and the like are eliminated from the periphery of the motor housing that becomes high temperature, thereby reducing material costs and work man-hours.

  Thus, even if the power supply cable made of an expensive heat-resistant insulating material used for power supply from the inverter device to the motor unit can be abolished as described above, the power supply unit mounted on the vehicle is electrically operated from the power supply unit to the inverter device of the electric compressor. A high-voltage cable for supplying high-voltage DC power for driving the motor, and a control communication cable for sending control power and control communication signals from the in-vehicle host controller to the inverter device cannot be abolished. Therefore, it is inevitable that the electric compressor and the vehicle side are connected by an insulation-coated cable.

JP 2002-191153 A

  By the way, the above-described electric compressor for an in-vehicle air conditioner is generally mounted and mounted on a structure such as a driving motor in the engine room of the vehicle, and is separately mounted on the vehicle as described above. When the vehicle is driven by high voltage power supplied from a power supply unit via a high voltage cable, the vehicle always has a risk of a collision accident while traveling. If the vehicle has a collision accident while operating the air conditioner, the electric compressor to which the high voltage is supplied may receive the impact directly or indirectly. If the inverter device of the electric compressor is damaged and the high voltage system is damaged when such an accident occurs, the high voltage may be short-circuited in the worst case. At this time, there is a possibility that a spark may be generated due to a short circuit and it may ignite, and there is no denying the possibility that this will spread to the vehicle side through the insulated cable for power supply or control communication.

  In addition, ignition on the electric compressor side is not limited to the case where the electric compressor is damaged due to a vehicle collision accident, but also when an abnormal overcurrent is supplied to the electric compressor side due to an abnormality in the power supply unit. May occur. The above-mentioned possibilities should not be, but it is necessary to take all possible measures in preparation. However, in an electric compressor for an in-vehicle air conditioner in which a conventional inverter device is integrated, there are not many countermeasures in the event of a fire due to a high voltage short circuit at the time of a collision accident or an overcurrent supply in the event of a power supply unit abnormality. There is no actual situation.

  The present invention has been made in view of such circumstances. In the unlikely event of a collision accident or abnormality of a power supply unit, a high voltage short circuit or abnormal overshoot due to damage to a high voltage system including an inverter device. An object of the present invention is to provide an electric compressor for an in-vehicle air conditioner that can prevent the spread of fire to the vehicle side even if it is ignited by supplying current or the like.

In order to solve the above-described problems, the electric compressor for an in-vehicle air conditioner according to the present invention employs the following means.
That is, the on-vehicle air conditioner electric compressor according to the present invention is provided with an inverter accommodating portion on the outer periphery of a housing in which the electric motor and the compression mechanism are incorporated, and converts DC power into three-phase AC power inside the housing. In an electric compressor for an in-vehicle air conditioner that houses and installs an inverter device that supplies power to an electric motor, the inverter device is connected to a cable connected to a power source and / or a control device mounted on a vehicle, and the cable A part on the side of the electric compressor is provided with a coating having self-extinguishing properties or fire resistance over the entire range from the connecting portion to the electric compressor to the middle in the length direction. To do.

According to the present invention, a part of the cable connected to the inverter device on the side of the electric compressor has a self-extinguishing property or a fire resistance over the entire range from the connecting portion to the electric compressor to the middle in the length direction. Because of this, the electric compressor mounted on the vehicle is damaged due to a vehicle accident, the high voltage supplied to the inverter device is short-circuited and ignited, or the power supply is abnormal. Even if an overcurrent is supplied and ignition occurs, the situation that it spreads through the cable to the vehicle side is covered over the entire range from the connection part of the cable to the electric compressor to the middle of its length. It can be suppressed by the self-extinguishing or fire-resistant coating provided . As a result, a vehicle fire caused by the electric compressor can be avoided, an accident can be minimized, and the reliability of the product can be improved.

  Furthermore, the electric compressor for on-vehicle air conditioner of the present invention is the above-described electric compressor for on-vehicle air conditioner, wherein the cable is a high-voltage cable for driving the electric motor and / or a control communication cable for controlling the inverter device. Each of which is provided with the coating.

  According to the present invention, the cable connected to the inverter device is composed of a high-voltage cable and / or a control communication cable, each of which is provided with a self-extinguishing or fire-resistant coating. However, it is possible to suppress the spread of fire through these cables. Thereby, the reliability with respect to the vehicle fire suppression by the ignition by the side of the electric compressor accompanying various accidents can be improved.

  Furthermore, the electric compressor for on-vehicle air conditioners of the present invention is any one of the above-described electric compressors for on-vehicle air conditioners, wherein the coating is configured by winding a tape having self-extinguishing properties or fire resistance. Features.

  According to the present invention, a self-extinguishing or fire-resistant coating can be formed by winding a tape around a cable, so that the cable can be provided with a self-extinguishing or fire-resistant coating only by winding the tape as needed. Therefore, a self-extinguishing function or a fire resistance function can be easily added to the cable without using a special cable.

  Furthermore, the on-vehicle air conditioner electric compressor according to the present invention is any one of the above-described on-vehicle air conditioner electric compressors, wherein the coating is configured by mounting a self-extinguishing or fire-resistant tube. It is characterized by.

  According to the present invention, since the self-extinguishing or fire-resistant coating can be formed by attaching the tube, the cable can be provided with the self-extinguishing or fire-resistant coating only by attaching the tube as needed. Thereby, a self-extinguishing property or a fire resistance function can be easily added to the cable without using a special cable.

According to the present invention, the electric compressor mounted on the vehicle is damaged due to a vehicle accident, and the high voltage supplied to the inverter device is short-circuited and ignited, or an overcurrent is supplied due to an abnormality in the power supply unit. Even if it leads to ignition, the situation that it spreads to the vehicle side through the cable for power supply or control communication is determined from the connection part of the cable to the electric compressor on the electric compressor side. Self-extinguishing or fire-resistant coating provided over the entire range up to the middle in the length direction can suppress the vehicle fire caused by the electric compressor, minimizing accidents In addition, the reliability of the product can be improved.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
FIG. 1 is an external side view of an inverter-integrated electric compressor for an in-vehicle air conditioner according to the first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the inverter device portion. Yes. The on-vehicle air conditioner electric compressor 1 has a housing 2 that constitutes an outer shell thereof. The housing 2 is configured by integrally fastening and fixing a motor housing 3 in which an electric motor (not shown) is accommodated and a compressor housing 4 in which a compressor (not shown) is accommodated via a bolt 5. The motor housing 3 and the compressor housing 4 are made of aluminum die casting.

  An electric motor and a compression mechanism (not shown) accommodated and installed in the motor housing 3 and the compressor housing 4 are connected via a motor shaft, and the compression mechanism is driven by the rotation of the electric motor. A suction port 6 is provided on the rear end side (right side in FIG. 1) of the motor housing 3, and the low-pressure refrigerant gas sucked into the motor housing 3 from the suction port 6 passes around the electric motor along the motor axis. After flowing in the L direction, it is sucked into the compression mechanism and compressed. The high-temperature and high-pressure refrigerant gas compressed by the compression mechanism is discharged into the compressor housing 4 and then sent out from the discharge port 7 provided on the front end side (left side in FIG. 1) of the compressor housing 4. It is supposed to be configured.

  The housing 2 includes two parts, a lower part on the rear end side (right side in FIG. 1) of the motor housing 3 and a lower part on the front end side (left side in FIG. 1) of the compressor housing 4, and one place on the upper side of the compressor housing 4. Mounting legs 8A, 8B, 8C are provided at a total of three locations. The electric compressor 1 for an in-vehicle air conditioner is fixedly installed with a bolt or the like on a cantilever bracket provided on a side wall of a driving motor for the vehicle via the mounting legs 8A, 8B, 8C and mounted on the vehicle. The As described above, the electric compressor 1 for an in-vehicle air conditioner is generally cantilevered at three points up and down, with one side faced along a cantilever bracket and the motor axis L direction directed in the front-rear direction or the left-right direction of the vehicle. It is usually done.

  A box-shaped inverter accommodating portion 11 is integrally formed on the outer peripheral surface of the motor housing 3 at the top thereof. As shown in FIG. 2, the inverter accommodating portion 11 has a box structure surrounded by a peripheral wall having a predetermined height and having an open upper surface. A cable connection port 12 for connecting two high-voltage cables 9 for supplying high-voltage DC power from a power supply unit (not shown) is provided on one side of the inverter accommodating portion 11, and on the opposite side, A cable connection port (not shown) for connecting a control communication cable 10 for sending a signal for control communication from the omitted upper control device is provided.

  Further, inside the inverter accommodating portion 11, a mounting hole 13 for attaching the glass sealing terminal 16, a PN terminal (not shown) for connecting the high voltage cable 9, a terminal (not shown) for connecting the control communication cable 10, and an inverter An installation surface 14 and an installation boss 15 for attaching various components constituting the device 18 are provided, and the glass sealed terminal 16 and the inverter device 18 are accommodated and installed in the inverter accommodating portion 11 through these. The high voltage cable 9 and the control communication cable 10 are connected, and the upper surface thereof is covered with a metal lid member 17 fixed with screws.

  As shown in FIG. 2, the inverter device 18 is made of an aluminum alloy in which four corners are fixedly installed on the installation boss 15 in contact with the installation surface 14 and the head capacitor 19 and the inductor 20 that adjust high-voltage DC power. A plate 21, a plurality of power semiconductor switching elements (not shown) installed on the plate 21 (for example, IGBT), a gate circuit for operating the switching elements, and the like are mounted and installed on the metal plate 21. Between the power circuit board 22 and the control communication circuit having an element that operates at a low voltage such as a CPU, the CPU board 23 having four corners fixedly installed on the installation boss 15, and the electrical components constituting the inverter device 18 A bus bar that has a plurality of bus bars that form electrical wiring, and each bus bar is integrated with an insulating resin by insert molding. Nburi 24 is equipped with a so on.

The inverter accommodating portion 11 is connected to the high voltage cable 9 and the control communication cable 10, and after the inverter device 18 is accommodated and installed, it is filled with a silicon gel material for vibration proof, moisture proof, and insulation, and the lid It is sealed by the member 17.
Further, in the present embodiment, the above-described high-voltage cable 9 and control communication cable 10 connected to the on-vehicle air conditioner electric compressor 1 are subjected to an on-vehicle air conditioner electric compressor due to a vehicle accident or a power supply unit abnormality. A cover 25 having self-extinguishing or fire resistance is provided in order to prevent the fire from spreading to the vehicle side in the event of a fire on one side.

The covering 25 is a general insulating coating on a tape 26 such as a mica tape in which laminated mica is bonded to a reinforcing material with a silicone adhesive having excellent heat resistance, or a flame-retardant conductive cloth tape having self-extinguishing properties. It can be provided by wrapping around the surface of the high voltage cable 9 and the control communication cable 10. The coating 25, like the high-voltage cable 9, when the clamping bracket 9B is provided between the connector terminals 9A is provided in a part of the electric compressor 1 side of the clamped brackets 9B It is done.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
When driving the air conditioner, high-voltage DC power is supplied to the inverter device 18 of the electric compressor 1 from the power supply unit mounted on the vehicle via the high-voltage cable 9. This DC power causes a switching element such as an IGBT to operate in the inverter device 18 via a gate circuit on the power substrate 22 based on a signal sent from the host controller to the control circuit on the CPU substrate 23 of the inverter device 18. By this, it is converted into AC power of a predetermined frequency commanded from the control device.

  The AC power is supplied from the inverter device 18 to the electric motor in the motor housing 3 through the glass sealing terminal 16 and rotates the electric motor at a predetermined number of rotations. As a result, the compression mechanism is driven, and the compressed refrigerant gas is sent from the electric compressor 1 to the refrigeration cycle to be used for air conditioning in the passenger compartment. On the other hand, while driving the air conditioner, the high voltage power for driving the electric motor supplied to the inverter device 18 of the electric compressor 1 and the low voltage power for control are grounded to the high voltage ground and the low voltage ground, respectively. In addition, necessary insulation measures are taken to prevent short circuits.

  Under such circumstances, when a vehicle unfortunately causes a collision accident while driving the air conditioner, the influence may be applied to the on-board electric compressor 1, and the electric compressor 1 is damaged. It is also envisaged that this will happen. In this case, the possibility that high voltage power is short-circuited to generate sparks and ignite cannot be denied. In addition, an abnormality occurs in the power supply unit, and an unexpected overcurrent is supplied to the inverter device 18, and thus it cannot be said that there is a possibility of causing ignition.

However, in this embodiment, even if the electric compressor 1 side is ignited by the above, the high voltage cable 9 and the control communication cable 10 have the self-extinguishing or fireproof coating 25 on the electric compressor 1 side. Since it is provided in a part, it is possible to stop spreading from the electric compressor 1 side to the vehicle side through the high voltage cable 9 and the control communication cable 10 by the covering 25 . Thus, a vehicle fire caused by the electric compressor 1 can be avoided, an accident can be minimized, and the reliability of the product can be improved.

Further, since both the high-voltage cable 9 and the control communication cable 10 are provided with a self-extinguishing or fire-resistant coating 25, the ignition on the electric compressor 1 side can be prevented from spreading all over the cables. Can do.
Further, since the coating 25 having self-extinguishing or fire resistance can be formed by winding the tape 26 around the cables 9 and 10, the self-extinguishing or fire-resistant coating 25 can be provided only by winding the tape 26 at any time. Therefore, the self-extinguishing function or the fire resistance function can be easily added to the cables 9 and 10 without using a special cable.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
This embodiment is different from the first embodiment described above in that the coating 25 having self-extinguishing properties or fire resistance is constituted by a tube. Since other points are the same as those in the first embodiment, description thereof will be omitted.
In this embodiment, instead of the self-extinguishing or fire-resistant tape, the high-voltage cable 9 that is covered with insulation is composed of a flame-retardant polypropylene tube, a flame-retardant polyimide tube, or the like that has self-extinguishing or fire resistance. By attaching the tube 36, the coating 25 having self-extinguishing or fire resistance is provided. The same applies to the control communication cable 10.

  As described above, the self-extinguishing or fire-resistant function can be added by attaching the self-extinguishing or fire-resistant tube 36 to the high-voltage cable 9 and the control communication cable 10 and providing the coating 25. Therefore, the ignition on the electric compressor 1 side can prevent all the fire spreading to the vehicle side through these cables. Therefore, the present embodiment can provide the same effects as those of the first embodiment.

In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, an example in which the inverter accommodating portion 11 is integrally formed with the motor housing 3 has been described. However, the inverter accommodating portion 11 configured separately may be assembled. Further, the high voltage cable 9, an example is described in which a film 25 having a self-extinguishing property or fire resistance portion of the electric compressor 1 side, Ya tape 26 having a self-extinguishing property or fire resistance The tube 36 is not limited to the above example, and may be another tape or tube having self-extinguishing properties or fire resistance.

It is an appearance side view of the electric compressor for in-vehicle air conditioners concerning a 1st embodiment of the present invention. It is a disassembled perspective view of the inverter apparatus part of the electric compressor for vehicle-mounted air conditioners shown in FIG. It is a fragmentary perspective view of the high voltage cable used for the electric compressor for vehicle-mounted air conditioners concerning 2nd Embodiment of this invention.

Explanation of symbols

1 In-vehicle air conditioner electric compressor (electric compressor)
2 Housing 9 High-voltage cable 10 Control communication cable 11 Inverter housing portion 18 Inverter device 25 Coating 26 Tape 36 Tube

Claims (4)

An in-vehicle air conditioner in which an inverter accommodating portion is provided on the outer periphery of a housing in which an electric motor and a compression mechanism are built, and an inverter device that converts DC power into three-phase AC power and supplies power to the electric motor is accommodated therein In the electric compressor for equipment,
The inverter device is connected to a cable connected to a power source and / or control device mounted on the vehicle,
Part of the cable on the side of the electric compressor is provided with a coating having self-extinguishing or fire resistance over the entire range from the connection to the electric compressor to the middle in the length direction. An electric compressor for in-vehicle air conditioners.   The in-vehicle air conditioner according to claim 1, wherein the cable includes a high-voltage cable for driving the electric motor and / or a control communication cable for controlling the inverter device, and each of the cables is provided with the covering. Electric compressor for equipment.   The electric compressor for an in-vehicle air conditioner according to claim 1 or 2, wherein the coating is configured by winding a self-extinguishing or fire-resistant tape. The electric compressor for an in-vehicle air conditioner according to claim 1 or 2, wherein the coating is configured by mounting a tube having self-extinguishing properties or fire resistance.

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