JPH09216510A - Vehicular air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a compressor. SOLUTION: A blower 12 is arranged in a blower case 14 communicating to a blast road reaching an evaporator and the blower 12 is connected to the rotary shaft 20 of a motor 18. The housing 22 of the motor 18 is arranged in an air passage 24 formed outside the blast road 14 and the one end part 24A of the air passage 24 communicates with the blower case 14. The one end part 26A of a rubber hose 26 for forming the discharge passage 30 is connected to the other end part 24B of the air passage 24 and the other end part 26B of the rubber hose 26 reaches a discharge hole 34 bored on the lower part 32 of a car body. Therefore, a cooling wind passed in the air passage 24 is passed in the housing 22 of the motor 18 and discharged from the discharge hole 34 to the outside of a car through the discharge passage 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner that cools a motor that rotationally drives a blower with cooling air.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner mounted on a vehicle such as an automobile, inside air or outside air is sucked in by a blower to blow air to an evaporator and a heater core to air-condition the inside of the vehicle. Actual Kaisho 60-11
8507.

As shown in FIG. 2, in this vehicle air conditioner, the blower 70 is rotated by a motor 72, but the motor 72 generates heat when energized, and if the temperature of the motor 72 becomes too high due to the heat generation, the motor 72 is heated. The life of 72 is adversely affected. Therefore, the air passage 76 is connected to the air passage 74 from the blower 70 to the evaporator (not shown), and a part of the air blown to the evaporator (arrow W1 in FIG. 2) is taken in through the air passage 76. By ventilating the inside of the housing of the motor 72, the motor 72 is cooled.

[0004]

However, in such a vehicle air conditioner, the cooling air (arrow W2 in FIG. 2) that has passed through the housing of the motor 72 and has been heated is returned to the air passage 74 again. There is. Therefore, the air temperature in front of the evaporator rises, increasing the power consumption of the compressor.

In view of the above facts, an object of the present invention is to obtain a vehicle air conditioner capable of reducing the power consumption of a compressor.

[0006]

A vehicle air conditioner of the present invention according to claim 1 is a blower case for accommodating a blower,
A motor for rotating the blower, an air passage for sending a part of the air in the blower case into the motor housing as motor cooling air, and a motor cooling air passing through the motor housing. A discharge passage for discharging the blower to the outside of the blower case.

Therefore, in the vehicle air conditioner according to the first aspect of the present invention, by the rotation of the blower driven by the motor,
A part of the air blown into the blower case is sent into the motor housing through the air passage as motor cooling air, passes through the motor housing, and the heated cooling air is passed through the discharge passage to the blower case. Discharge to the outside.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicle air conditioner of the present invention will be described with reference to FIG.

As shown in FIG. 1, the blower 12 of the vehicle air conditioner 10 of the present embodiment is arranged in a blower case 14 which is in communication with an air passage leading to an evaporator (not shown). The outside air (arrow S1 in FIG. 1) is taken in from the outside air inlet 16 formed in 14, and cooling air (arrow S2 in FIG. 1) is blown to the evaporator.

The blower 12 is connected to a rotary shaft 20 of a motor 18, and is driven by the motor 18 to rotate in a predetermined rotation direction at a predetermined rotation speed. The housing 22 of the motor 18 is disposed inside an air passage 24 formed outside the air passage 14,
One end 24 </ b> A is communicated with the blower case 14. Therefore, the air passage 24 allows the blower case 1
Part of the air in the motor 4 (arrow S3 in FIG. 1) is sent into the housing 22 of the motor 18 as motor cooling air.

One end 26A of the rubber hose 26 is connected to the other end 24B of the air passage 24, and a discharge passage 30 is formed. Further, the other end portion 26B of the rubber hose 26 reaches an exhaust hole 34 formed in a lower portion 32 of the vehicle body. Therefore, the housing 2 of the motor 18
The motor cooling air (arrow S4 in FIG. 1) that has passed through the inside 2 and is heated is discharged from the exhaust hole 34 to the outside of the vehicle through the discharge passage 30.

Next, the operation of this embodiment will be described. In the vehicle air conditioner 10 of this embodiment, when the blower 12 is rotationally driven by the motor 18, the outside air (arrow S1 in FIG. 1) is taken in from the outside air introduction port 16 formed in the blower case 14, and the cooling air is supplied to the evaporator. (The arrow S2 in FIG. 1) is blown. At this time, the blower case 1 is opened by the air passage 24.
Part of the air in the motor 4 (arrow S3 in FIG. 1) is sent into the housing 22 of the motor 18 as motor cooling air. Since the housing 22 of the motor 18 is cooled by the motor cooling air, the temperature rise of the motor 18 can be suppressed.

Further, motor cooling air that has been heated by passing through the housing 22 of the motor 18 (arrow S4 in FIG. 1)
Is discharged from the exhaust hole 34 to the outside of the vehicle through the discharge passage 30.

Therefore, since the motor cooling air that has passed through the inside of the housing 22 of the motor 18 and is heated is not returned to the air duct to the evaporator as in the conventional case, the air volume to the evaporator is slightly reduced, but the air is blown to the evaporator. Since the temperature of the cooling air (arrow S2 in FIG. 1) to be generated does not rise, the power consumption of the compressor can be reduced. Further, when the blower fan is rotated while the air conditioner is off, the blown-out air does not become warmer than the inside air temperature, and it is possible to prevent a sense of discomfort associated with this. Also,
Since the cooling performance is improved, when the cooling performance is the same as the conventional one, the fin pitch of the evaporator can be made coarse, the size of the condenser can be reduced, and the cost can be reduced.

In the above, the present invention has been described in detail with respect to specific embodiments, but the present invention is not limited to such embodiments, and various other embodiments within the scope of the present invention. It is obvious to a person skilled in the art that

[0016]

According to the vehicle air conditioner of the present invention as set forth in claim 1, a blower case for accommodating the blower, a motor for rotationally driving the blower, and a part of the air in the blower case are housed in the motor housing. Since the air passage for sending in as cooling air and the discharge passage for discharging the motor cooling air that has passed through the motor housing to the outside of the blower case are provided, the power consumption of the compressor can be reduced. It has an excellent effect. Further, when the blower fan is rotated while the air conditioner is off, the blown-out air does not become warmer than the internal air temperature, and it is possible to prevent the discomfort caused by this.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing a vehicle air conditioner according to an embodiment of the present invention.

FIG. 2 is a schematic side sectional view showing a vehicle air conditioner according to a conventional embodiment.

[Explanation of symbols]

 10 Vehicle Air Conditioner 12 Blower 14 Blower Case 18 Motor 22 Motor Housing 24 Air Passage 30 Discharge Passage 34 Exhaust Hole

Claims (1)

[Claims] 1. A blower case for accommodating a blower, a motor for rotationally driving the blower, and an air passage for sending a part of the air in the blower case into the housing of the motor as motor cooling air. And a discharge passage for discharging the motor cooling air that has passed through the inside of the motor housing to the outside of the blower case.