JP2001163038A - Air condition for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner capable of cooling a control box by an air fan for a heat source side heat exchanger without hindering the flow of the wind of the air fan, and allowing easy mounting of the control box. SOLUTION: In this air conditioner for an automobile where a compressor 1 is driven by a compressor motor 2, a heat sink 18 is attached on a control box 6 accommodating a control circuit of the compressor motor 2 including an inverter circuit, and integrally mounted with a ball mouth 9. The heat sink 18 is provided with radiating fins mounted in the bell mouth for straightening the flow of the wind between the heat source side heat exchanger and the air fan in the direction in parallel with the wind lowing direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a vehicle in which a compressor is driven by an electric motor.

[0002]

2. Description of the Related Art In an automobile driven by an internal combustion engine such as a gasoline engine or a diesel engine, a compressor for an air conditioner is usually driven by these internal combustion engines. On the other hand, in the electric vehicle, the compressor for the air conditioner must be driven by another motor in order to reduce the load on the axle driving motor.

[0003] As a motor for a compressor, an AC motor or a DC motor is usually used. For this reason, the DC voltage of the battery is converted into AC by an inverter circuit or energized in accordance with the rotational position of the rotor, and is supplied to the compressor motor. Then, the cooling capacity of the air conditioner is adjusted by variably controlling the rotation speed of the compressor by an inverter circuit.

In such a compressor operation circuit, since a large current flows through a switching element such as a transistor constituting an inverter circuit to generate heat, it is necessary to take measures against radiation of the switching element. In a conventional air conditioner for an electric vehicle, as a measure against heat radiation of a switching element of an inverter circuit, a dedicated cooling fan is provided, or a heat radiating portion of the inverter circuit is attached to a low-temperature side pipe of an air conditioning refrigeration cycle.

[0005] However, the method of providing a dedicated cooling fan requires an installation space and costs.
In addition, in the method in which the heat radiating portion of the inverter circuit is attached to the low-temperature side pipe of the air conditioning refrigeration cycle, it is necessary to provide a pipe that has a low temperature in both cooling and heating. Condensation may occur. Therefore, Japanese Patent Application Laid-Open No. 7-149138 (B
As shown in (60H 1/32), by installing at least the heat radiating part of the inverter circuit in a place where the wind of the blower fan that cools the heat source side heat exchanger is blown, one blower fan and the heat source side heat exchanger An air conditioner for an electric vehicle that cools both an inverter circuit has been proposed.

In such an air conditioner for an electric vehicle, a cooling fan dedicated to the inverter circuit is not required, and the piping structure of the refrigeration cycle does not need to be complicated.

[0007]

However, in the above-mentioned conventional air conditioner for an electric vehicle, the inverter circuit is installed in a place where the wind of the blower fan for cooling the heat source side heat exchanger hits. In addition, the mounting fixture hinders the flow of air from the blower fan, and accordingly, there is a problem that the cooling efficiency of the heat source side heat exchanger is reduced. In addition, there is a problem that it takes time to attach the inverter circuit.

The present invention solves such a problem, and cools a drive circuit of a compressor motor including an inverter circuit by a blower fan for a heat source side heat exchanger without obstructing a flow of air from a blower fan. It is another object of the present invention to simplify the operation of mounting the drive circuit.

[0009]

According to a first aspect of the present invention, there is provided an air conditioner for an automobile, comprising: a compressor for compressing a refrigerant; a heat source side heat exchanger; and a heat source side heat exchanger. A refrigeration cycle including a blower fan for blowing air, a decompression device, and a use-side heat exchanger for air-conditioning the interior of the vehicle, a compressor motor for driving the compressor, and a drive converted from DC power to the compressor motor An automotive air conditioner comprising a drive circuit for supplying electric power, wherein the drive circuit is housed in a control box in which a heat sink is integrally mounted on the outside, and the heat sink has a plurality of heat sinks on one surface. A parallel radiating fin is provided, and the radiating fin is arranged in a bell mouth that rectifies the flow of the wind between the heat source side heat exchanger and the blower fan, and is parallel to the direction of the flow of the wind. That we have And butterflies. With this configuration, the drive circuit in the control box can be cooled by the blower fan for the heat source side heat exchanger without obstructing the flow of air from the blower fan.

Further, the air conditioner for a vehicle according to the present invention is characterized in that the heat sink is provided on a refrigerant outlet side of the heat source side heat exchanger. With this configuration, the control box can be cooled in a portion where the air temperature of the blower fan is the lowest, and the cooling efficiency is improved.

According to a third aspect of the present invention, in the automotive air conditioner, the heat sink is formed in a shape along the outer periphery of the bell mouth. By doing so, the amount of wind passing through the cooling fins of the heat sink increases, and the cooling efficiency improves.

[0014] In the air conditioner for a vehicle according to a fourth aspect of the present invention, the control box is mounted on the bell mouth. This simplifies the work of attaching the control box.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram of a refrigeration cycle of the automotive air conditioner of the present invention. In FIG.
1 is a compressor, 2 is a motor for driving the compressor, 3 is a heat source side heat exchanger, 4 is an expansion valve, 5 is a use side heat exchanger, 6 is a control box, 7 is a blower fan, 8 is a fan motor, 9 is a bell mouth, 10 is a tire. In addition, SV is a four-way switching valve, and the solid line arrow A in the figure indicates the state of the cooling operation, and the dotted arrow B indicates the state of the heating operation.

During the cooling operation, the compressor 1
And compresses the refrigerant in the refrigeration cycle, and sends the high-temperature and high-pressure refrigerant to the heat source side heat exchanger 3. In the heat source side heat exchanger 3, air is blown in the direction of arrow C by the blower fan 7, the refrigerant flowing therethrough is forcibly cooled, and the low-temperature refrigerant is used through the expansion valve 4 as a pressure reducing device. It is sent to the side heat exchanger 5. Then, the inside of the vehicle compartment is cooled by the heat of vaporization at the time of vaporization in the use side heat exchanger 5. The bell mouth 9 is provided so that all the wind of the blower fan 7 is sent through the heat source side heat exchanger 3 so that the heat source side heat exchanger 3 can be efficiently cooled. It is formed in a shape. In the heating operation, the refrigerant is condensed in the use-side heat exchanger 5 and the refrigerant is evaporated in the heat-source-side heat exchanger 3, so that the heating operation in the vehicle compartment is performed.

FIG. 2 is a block diagram of the operation control of the compressor. In FIG. 2, reference numerals 1 and 2 correspond to those in FIG. 1, and reference numeral 11 denotes a battery which also serves as a power source for a motor for driving an automobile (a general-purpose charging circuit can be used, so that the description is omitted. ) And 13 are smoothing capacitors. Since the output voltage of the battery 11 greatly varies depending on the driving condition of the vehicle, the output voltage is adjusted to a constant voltage by the buck-boost converter 12 and then input to the inverter circuit 14.

The buck-boost converter 12 turns on the transistor Tr to supply a short-circuit current to the real tor L inserted in series with the power supply circuit to accumulate electromagnetic energy, and then turns off the transistor Tr to turn off the real tor. This is a forward-type switching power supply that performs boosting by superimposing a voltage induced by electromagnetic energy stored in L and a voltage of the battery 11. The voltage is smoothed by the capacitor 13 and applied to the inverter circuit 14. Even if the output voltage of the battery 11 fluctuates greatly, the input voltage of the inverter circuit 14 can be kept within a certain range by appropriately adjusting the on-duty of the transistor Tr according to the magnitude of the fluctuation. . The switching frequency is a normal frequency band.

In the inverter circuit 14, the direct current is converted into a pseudo-sine-wave three-phase alternating current based on the PWM theory by controlling the on / off of a plurality of power transistors connected in a three-phase bridge by an output from the gate driving circuit 15. I do. Alternatively, the stator winding to be energized is selected according to the rotational position of the rotor and energized. The gate drive circuit 15 is controlled by a compressor control circuit 16, and the compressor control circuit 16 is controlled by an air conditioning control circuit 17.

In such a compressor operation circuit, since a large current flows through the inverter circuit 14 to generate heat in the power transistor constituting the inverter circuit, heat dissipation measures are required. Further, since the reactor L and the capacitor 13 of the buck-boost converter 12 also generate heat, it is necessary to take measures against heat radiation.

The circuits including the heat-generating components requiring heat radiation measures are housed in the control box 6. As shown in FIG. 3, a heat sink 18 is attached to the lower surface of the control box 6, and the heat sink 18 is attached to the bell mouth 9 in a state where the heat sink 18 is exposed to the wind of the blower fan 7. The heat sink 18 is formed of a material having good heat conductivity such as aluminum, and as shown in FIG. 4, a plurality of plate-shaped heat dissipating fins 20 are provided below the substrate 19 in parallel with each other. Is formed in a shape along the outer periphery of the. Although the heat sink 18 shown in FIG. 4 is linear in accordance with the shape of the control box 6, it may be curved in accordance with the shape of the bellmouth 9.

The circuit including the heat-generating component is housed in the control box 6 in such a state that the heat-generating component is in thermal contact with the substrate 19 of the heat sink 18. Heat sink 18
Are arranged so that the radiation fins 20 are parallel to the direction of the wind, and almost only the radiation fins 20 are exposed to the wind. Furthermore, if the control box 6 and the heat sink 18 are mounted on the refrigerant outlet side of the heat source side heat exchanger where the temperature is the lowest, the blower fan 7
The temperature of the wind becomes lowest, and the heat sink 18 can be cooled efficiently. In any case, since the radiating fins 20 are arranged in the wind of the blower fan 7 and in parallel with the direction of the flowing wind, the heat sink 18 almost eliminates the flow of the wind of the blower fan 7. Allows cooling without interruption.

Further, since the control box 6 accommodating the circuit including the heat-generating components is mounted integrally with the bell mouth 9 together with the heat sink 18, the control box 6 is attached to the bell mouth 9 in advance, so that the heat source side heat exchange is performed. The control box 6 can be attached at the same time as the bell mouth 9 is attached to the container 3, thereby simplifying the attachment operation.

[0022]

Since the present invention is configured as described above, it has the following effects. That is, in the automotive air conditioner according to claim 1, a heat sink having a plurality of parallel radiating fins on one surface is attached to the control box, and the radiating fins of the heat sink are connected to the heat source side heat exchanger and the blower fan. It was provided in a bell mouth that rectifies the flow of wind between the two, and in parallel with the direction of flow of the wind. As a result, the drive circuit in the control box can be cooled by the blower fan for the heat source side heat exchanger without obstructing the flow of air from the blower fan.

Further, in the air conditioner for a vehicle according to the present invention, since the heat sink is provided on the refrigerant outlet side of the heat source side heat exchanger, the heat sink can be cooled at a portion where the wind temperature of the blower fan is the lowest. Thus, the cooling efficiency is improved.

Further, in the automotive air conditioner according to the third aspect, since the heat sink is formed in a shape along the outer periphery of the bell mouth, the amount of wind passing through the cooling fins of the heat sink is increased, and the cooling efficiency is improved. Get better.

In the air conditioner for a vehicle according to the fourth aspect of the present invention, since the control box is mounted on the bell mouth, the control box can be mounted at the same time as the bell mouse is mounted, thereby simplifying the mounting operation. .

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a refrigeration cycle of an automotive air conditioner of the present invention.

FIG. 2 is an operation control block diagram of the compressor.

FIG. 3 is a layout diagram of a control box.

FIG. 4 is a view showing a heat sink.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Compressor 2 ... Compressor motor 3 ... Heat source side heat exchanger 4 ... Expansion valve 5 ... Usage side heat exchanger 6 ... Control box 7 ... Blower fan 8 ... Fan motor 9 ... Bell mouth 10 ... Tire 11 ... Battery 13 ... capacitors 18 ... heat sinks

Continuation of the front page (72) Inventor Hideharu Yanase 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Inventor Norio Abkawa 2-5-2-5 Keihanhondori, Moriguchi-shi, Osaka Inside Sanyo Electric Co., Ltd. (72) Hisashi Tokizaki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Prefecture Inside Sanyo Electric Co., Ltd. (72) Mamoru Kubo 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Shigeharu Sasaki 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A compressor for compressing a refrigerant, a heat source side heat exchanger, a blower fan for blowing air to the heat source side heat exchanger, a pressure reducing device, and a use side heat exchanger for air-conditioning a vehicle interior. A refrigeration cycle, a compressor motor for driving the compressor, and a vehicle air conditioner including a drive circuit for supplying drive power converted from DC power to the compressor motor, wherein the drive circuit, The heat sink is housed in a control box in which a heat sink is integrally mounted. The heat sink includes a plurality of parallel radiating fins on one surface, and the radiating fins are connected to the heat source side heat exchanger and the blower fan. Inside the bell mouth that rectifies the flow of wind between and
An air conditioner for an automobile, wherein the air conditioner is provided so as to be parallel to a direction in which wind flows. 2. The automotive air conditioner according to claim 1, wherein the heat sink is provided on a refrigerant outlet side of the heat source side heat exchanger. 3. The heat sink according to claim 1, wherein the heat sink is formed in a shape along an outer periphery of the bell mouth.
Or the air conditioner for vehicles according to 2. 4. The air conditioner according to claim 1, wherein said control box is mounted on said bell mouth.