JPS6117842Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field] The present invention relates to a vehicle air conditioner.

[Conventional technology]

Generally, automobiles have traditionally been equipped with air conditioners that include a built-in heater unit, but recently, it has become common for automobiles to be equipped with air conditioners that also include a built-in cooler unit. The heater unit uses a heating heat exchanger that uses hot water from the engine's radiator as a heat source to warm the air inside or outside the vehicle and blow it into the interior of the vehicle. On the other hand, in the cooler unit, an evaporator that receives refrigerant from a refrigerant compressor driven by part of the car's engine power via an electromagnetic clutch cools the air inside the car and blows it out into the car.
The supply of radiator hot water to the heating heat exchanger can be turned on and off by operating a lever, etc., and the refrigerant compressor is driven and stopped by turning on and off the cooling operation switch. By the way, the heater unit and the cooler unit are usually constructed independently. That is, in the heater unit, a blower and a heating heat exchanger are disposed in a heating air passage having a first interior air inlet and an exterior air intake that can be switched by a damper, and during heating operation, Warm air that has passed through a heating heat exchanger is blown out from a hot air outlet installed inside the vehicle. On the other hand, the cooler unit has a blower and an evaporator arranged in a cooling air passage having a second in-vehicle air inlet, and during cooling operation, the cool air that has passed through the evaporator is sent to a cool air blower installed in the cabin. It is configured to blow out from the outlet. Therefore, these units are normally used separately in winter and summer.

In addition, an air conditioning system (1983-1983) was developed that improved the above configuration and made it possible to ventilate the inside of the vehicle without opening the vehicle windows.
68548) is also available. This device is
An exhaust duct is provided in the heating air passage on the leeward side of the heating heat exchanger, and this exhaust duct is provided with an outlet to the outside of the vehicle equipped with a shutter through the exhaust side passage of the heat exchanger. The outside air suction passage that sucks in the air is communicated with the cold air outlet via the suction side air passage of the heat exchanger. With this configuration, in addition to the above-mentioned heating operation and cooling operation, ventilation can be performed while performing the cooling operation, especially in the summer. In other words, air inside the car is discharged to the outside of the car through a heating air passage, a heating heat exchanger (no heat source is supplied), and a heat exchanger, and air outside the car is passed through an outside air intake passage, a heat exchanger, and then into the car from a cold air outlet. This enables ventilation operation that blows air out. In particular, during cooling operation, the air inside the car, which is sufficiently low in temperature compared to the outside temperature, is not heated by the heating heat exchanger, but the heat exchanger cools the outside air introduced from the outside air intake passage before exhausting it. be done. This is to save energy during cooling operation.

In any case, radiator hot water is not supplied to the heating heat exchanger during cooling operation.

[Problem that the invention attempts to solve]

By the way, in a car equipped with a cooler unit, during cooling operation in the summer, a load is added to the engine by driving the refrigerant compressor, which is likely to cause overheating.

As a countermeasure to this problem, efforts have been made to increase the heat dissipation efficiency of the radiator by improving the air blowing capacity and efficiency of a cooling fan that is driven by a portion of the engine power to cool the radiator water temperature.
However, since overheating generally occurs when the engine continues to drive the refrigerant compressor during low-speed operation, this is not very effective. For this reason, a method has been implemented in which the refrigerant compressor is disconnected when the engine is operating at low speed to reduce the engine load. However, this has the problem that comfortable cooling cannot be achieved because the cooling operation is interrupted.

In contrast, the present invention focuses on the fact that the heating heat exchanger installed in the heater unit uses radiator hot water, and allows this heating heat exchanger to act as an auxiliary radiator as necessary. An object of the present invention is to provide a vehicle air conditioner having an overheat prevention function.

[Means for solving problems]

According to the present invention, the first air path has an outside air intake port that can be opened and closed by a damper, and blows the air sucked in from the first inside air outlet through a heating heat exchanger using radiator hot water as a heat source. , a second air path having an in-vehicle air intake port and blowing out the air taken in from the second in-vehicle outlet through a refrigerant evaporator,
Vehicle use, characterized in that a communication port to the outside of the vehicle and a damper for switching opening and closing between the communication port and the first interior air outlet are provided on the leeward side of the heating heat exchanger in the first air path. An air conditioner is obtained.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a vehicle air conditioner according to the present invention, which includes a motor unit and a cooler unit.

In this device, a main blower 11 is driven by a blower motor 10 to suck in cabin air from a cabin air intake port 21, and the air is passed through a cooling refrigerant evaporator 22 to a second cabin air blower located near the driver's seat panel. The second blowout shown by the solid line blows out from the outlet 23.
sub-blower 1 with air passage 20 and blower motor 10.
2, the outside air intake port 31 sucks outside air, and the air is passed through a heating heat exchanger 32 to the first inside air outlet 3 located near the driver's seat floor.
The first air passage 30 shown by the broken line blows out from 3 into the car.
is formed.

Note that a communication port 24 is provided between the second air path 20 and the first air path 30 on the leeward side of the refrigerant evaporator 22 and on the windward side of the heating heat exchanger 32 so that they can communicate with each other. This communication port 24 and the second air passage 2
0 is the second damper 25 for heater/cooler switching
It is switched open and closed with . Further, the first air passage 30 is provided with an exterior discharge port 34 communicating with the exterior of the vehicle on the leeward side of the heating heat exchanger 32. The first in-vehicle air outlet 33 and the out-vehicle exhaust port 34 are selectively opened and closed by a third damper 35 for switching between in-vehicle circulation and in-vehicle exhaust. 36 is a first damper for intake of air outside the vehicle, and 37 is an air mix damper for temperature adjustment.

The airflow passing through these air channels is transferred to the second damper 2
5. The first damper 36 and the third damper 35 are set by being switched and controlled according to the operating mode of the device. Note that the damper position in the figure indicates the state during cooling operation, and refrigerant is supplied to the refrigerant evaporator 22 from a refrigerant compressor connected to the engine. As a result, the interior air sucked by the main blower 11 through the interior air suction port 21 is transferred to the refrigerant evaporator 2.
2, and is blown out and circulated into the vehicle from the second in-vehicle air outlet 23. In addition, when it is desired to adjust the temperature of the cold air from the second in-vehicle outlet 23, while supplying radiator hot water to the heating heat exchangers 3 and 2,
This is done by adjusting the opening degrees of the second damper 25 and air mix damper 37. That is, refrigerant evaporator 2
A part of the air cooled in step 2 is reheated in the heating heat exchanger 32 by opening the second damper 25, and a part of the reheated warm air is transferred to the second air by opening the air mix damper 37. The temperature can be adjusted by mixing it with the cold air from the passage 20 (this is usually called an air mix method).

In winter, heating operation is the main operation, and cooling operation is rarely performed. Unless cooling operation is performed, the refrigerant compressor is disconnected from the engine and is not driven, so no heat exchange is performed in the refrigerant evaporator 22. It is possible to perform heating operation, operation by introducing air from outside the vehicle, and operation by introducing air from inside the vehicle. In the case of heating operation by introducing air from outside the vehicle, the first damper 36 is placed at the b position, the second damper 25, and the third damper 35 are placed at the a position, and the heating heat exchanger 3
Radiator hot water is supplied to the first in-vehicle air outlet 3, and the outside air heated by the heating heat exchanger 32 is supplied to the first in-vehicle air outlet 3.
Air outlet from 3. On the other hand, in the case of heating operation by introducing air into the vehicle, the third damper 35 and the first damper 3
6 is placed at position a, and the second damper 25 is placed at position b. Of course, there is no refrigerant supply to the refrigerant evaporator 22,
In-vehicle air warmed by the heating heat exchanger 32 is blown out from the first in-vehicle air outlet 33 along a path indicated by a dashed line in the figure.

Next, the heating heat exchanger 32, which is a feature of the present invention,
The operation of causing the radiator to function as an auxiliary radiator will be explained.

In this embodiment, in addition to the above-mentioned air passage for circulating inside the vehicle during cooling and heating operations, the sub-blower 12 is configured to allow air outside the vehicle to be discharged to the outside of the vehicle through a heating heat exchanger 32. Due to this,
Especially during cooling operation, when the radiator water temperature reaches a temperature that may lead to overheating, the second damper 2
5 remains on the a side and switches the first damper 36 and the third damper 35 to the b side, the heating heat exchanger 32
radiates heat by exchanging heat with air outside the vehicle through forced blowing,
This allows the radiator to function as an auxiliary radiator that lowers the water temperature.

The easiest way to change the timing of switching between the first damper 36 and the third damper 35 is to do it manually while looking at the existing radiator water temperature meter, but it is also possible to switch the timing by using a radiator water temperature sensor such as a thermistor, or a radiator discharge air temperature sensor. It is also possible to install a mechanism that drives the damper with the output so that the damper is automatically switched when a predetermined temperature is reached.

In this way, the present invention allows the heating heat exchanger, which is normally used as a heater for heating operation, to be used as a radiator, thereby promoting cooling of the radiator water temperature without making any troublesome improvements to the radiator. Therefore, there is an effect that overheating due to overload during cooling operation can be prevented even during cooling operation.

In particular, in the embodiment, the air outside the vehicle is forcedly ventilated to the heating heat exchanger 32 using an electric blower that is not affected by the engine speed, so that heat is radiated from the heating heat exchanger 32 even during low-speed operation. The effect remains the same. Therefore, there is no need for control such as disconnecting the refrigerant compressor from the engine during low-speed operation, and the cooling operation is not interrupted, so comfortable cooling can be achieved.

Note that the structure of each ventilation passage, the installation location of the damper, etc. are not limited to those shown in the drawings, and various design changes are possible.In the example, an air conditioner with a cooler unit and a heater unit was explained, but it is possible to change the design with only a heater unit. It is clear that the same effect can be obtained in the air conditioner by providing an outside air inlet and an outside air outlet on the windward and leeward sides of the heating heat exchanger 32, respectively, as in the embodiment.

[Brief explanation of the drawing]

FIG. 1 shows a schematic configuration of an example of a vehicle air conditioner according to the present invention. The drawing reference numbers are as follows: 10: Blower motor, 11: Main blower, 1
2: Sub-blower, 22: Refrigerant evaporator, 23: Second
32: Heat exchanger for heating, 33: First interior air outlet, 31: Outside air intake port, 34:
External discharge port, 25: second damper, 36: first damper, 35: third damper, 37: air mix damper.

Claims (1)

[Scope of utility model registration request] A first air path that has an outside air intake port 31 that can be opened by a first damper 36 and blows air sucked in from a first inside air outlet 33 through a heating heat exchanger 32 that uses radiator hot water as a heat source. 30, and a second air path 20 that has an in-vehicle air suction port 21 and blows out air sucked in from a second in-vehicle outlet 23 through a refrigerant evaporator 22, and the refrigerant in the second air path is A communication port 24 is provided between the leeward side of the evaporator and the windward side of the heating heat exchanger of the first air path, and a second air path is provided to switch between the communication port and the second air path to open and close. A damper 25 is provided on the leeward side of the heating heat exchanger in the first air path, and a third damper 35 that switches between opening and closing an outside discharge port 34 and the first inside air outlet. A vehicle air conditioner characterized by: