JPS63482Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to air conditioning systems for vehicles, particularly automobiles.

Up until now, automotive air conditioners have consisted of a heating system with a heating heat exchanger that uses part of the hot water that cools the engine as its heat source, and a cooling heat exchanger that uses a refrigerant evaporator from a refrigerant compressor driven by the engine. A cooling device and a cooling device are provided independently. Therefore, the installation space inside the car is large, and the price is inevitably high. In addition, the cooling system has a drawback in that the cooling capacity is insufficient in the low rotational speed range of the engine.

The present invention was made to eliminate the above-mentioned drawbacks, and its configuration is that in the engine coolant circulation circuit including the radiator, the flow is diverted from the piping on the outlet side of the radiator by a first three-way valve, and the divided flow is The first part exchanges heat between the liquid and the air for blowing into the car.
a first circuit that returns the coolant to the coolant circulation circuit downstream of the diversion point through a heat exchanger, and a three-way valve that divides the flow from the first circuit downstream of the first heat exchanger; a second circuit connected to return the removed liquid to the first circuit upstream of the first heat exchanger via a pump, a second heat exchanger, and a solenoid valve; The second heat exchanger is a liquid cooling heat exchanger combined with an evaporator that evaporates refrigerant from the refrigerant compressor driven by the engine, and during heating operation, part of the liquid from the radiator is By returning the heat exchanger to the coolant circulation circuit through the first three-way valve, the first heat exchanger, and the second three-way valve, the first heat exchanger acts as a radiator, and during cooling operation, the heat exchanger functions as a radiator. The liquid in the first circuit separated by the second three-way valve is cooled in the second heat exchanger and then supplied to the first heat exchanger, so that the first heat exchanger is used as a cooler. In addition, a portion of the liquid is also supplied from the first three-way valve to the first heat exchanger, and substantially the same amount of liquid as this supplied amount is supplied from the second three-way valve to the cooling liquid. It is characterized by being able to return to the circulation circuit.

This makes it possible to control the temperature inside the vehicle not only by controlling the liquid flow rate in the second circuit but also by mixing a portion of the liquid from the radiator with the liquid cooled by the second heat exchanger. Become.

Examples of the present invention will be described below.

FIG. 1 is a circuit diagram of an embodiment of the present invention.

This circuit basically consists of a circulation circuit in which warm water whose temperature has risen after cooling the automobile engine 1 is returned to the engine 1 through a radiator 2 by an engine-driven pump P ₂ and then back to the engine 1 through a three-way valve 3. A circulation circuit in which a part of the hot water from 2 passes through a cooling/heating heat exchanger 4 and then returns to the engine 1 through a three-way valve 5, and a heat exchanger 6 that cools the same water as the engine cooling water cools the water to the motor M.
It has a circulation circuit that is driven by a pump P ₁ that passes through an electromagnetic valve 7 , a heat exchanger 4 , and returns to a heat exchanger 6 through a three-way valve 5 . The heat exchanger 6 uses an evaporator 9 of refrigerant from a refrigerant compressor 8 driven by an engine as a cooling source. 10 is a refrigerant condenser, 11 is an expansion valve, and 12 is a blower for blowing air into the vehicle through the heat exchanger 4. Furthermore, the three-way valve 3 is a solenoid valve, and as described above, has the function of flowing hot water from the radiator 2 only to the engine 1, and the function of dividing the hot water into the engine 1 side and the heat exchanger 4 side at a fixed ratio. There is. Similarly, the three-way valve 5 is also a solenoid valve, which has the function of returning water from the heat exchanger 4 only to the engine 1 side, returning it only to the pump P ₁ side, and returning the water from the heat exchanger 4 to the engine 1 side and the pump P ₁ side at a fixed ratio. It also has the function of dividing the flow.

In the case of heating operation, a part of the hot water from the radiator 2 is divided by the three-way valve 3 and sent to the heat exchanger 4, and the blower 12 blows out the warm air heated by the heat exchanger 4 into the vehicle interior. Of course, at this time, the motor M and the refrigerant compressor 8 are in a stopped state, and the solenoid valve 7 is closed.

In the case of cooling operation, motor M, refrigerant compressor 8
Both are driven, solenoid valve 7 opens, three-way valve 3 returns all hot water from radiator 2 to engine 1,
The three-way valve 5 pumps all the water that has passed through the heat exchanger 4.
They are each switched to return to the P ₁ side.
As a result, the water cooled by the heat exchanger 6 absorbs heat by the heat exchanger 4, and the blower 12 blows out the cold air cooled by the heat exchanger 4 into the vehicle interior. Here, the output signal of the temperature sensor _S1 installed at the air outlet of the heat exchanger 4 is used to continuously control the temperature of the blown air by controlling the voltage of the motor M. Furthermore, by switching the three-way valve 3 to separate the flow to the engine 1 side and the heat exchanger 4 side, and switching the three-way valve 5 to separate the flow to the engine 1 side and the pump P ₁ side, mixing of hot water and cold water is achieved. The vehicle interior temperature can be controlled by Of course, three-way valve 5
The divided flow rate to the engine 1 is set to be equal to the amount of hot water flowing into the three-way valve 3.

FIG. 2 shows a block diagram of the rotational speed control unit of the motor M that drives the pump _P1 .

The output signal of the temperature sensor _S1 is sent to the control unit 13.
The control unit 13 sends an output signal corresponding to the input signal to an amplifier 14 to control the voltage of the motor M.

As explained above, in this invention, when cooling the chilled water used for air conditioning operation, it is not directly affected by the engine rotation, and the blowing air temperature is controlled in addition to the flow rate control of the chilled water. This can also be done by mixing with a portion of the hot water from the radiator, making it easy to control the temperature inside the vehicle and providing sufficient cooling capacity even in the low engine speed range. In addition, as the water to be cooled in the heat exchanger 6, antifreeze is used as well as engine cooling water, so that the cooling temperature in the heat exchanger 6 can be reduced to 0°C.
The heat exchanger 6 can be
can be downsized. Furthermore, it can be provided at a lower cost than an air conditioner in which the cooling device and the heating device are provided independently.

[Brief explanation of the drawing]

FIG. 1 shows a liquid circuit diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of a control unit for a motor M of the liquid circuit diagram. In the diagram, 1 is the engine, 2 is the radiator, 3, 5
is a three-way valve, 4 is a heating and cooling heat exchanger, 6 is a heat exchanger, 7 is a solenoid valve, 8 is a refrigerant compressor, 9 is a refrigerant evaporator, 10 is a refrigerant condenser, 11 is an expansion valve, 12 is a blower, S ₁ is a temperature sensor, P ₁ and P ₂ are pumps, 13
14 is a control unit, and 14 is an amplifier.

Claims (1)

[Scope of utility model registration request] The liquid is divided by a first three-way valve from the piping on the outlet side of the radiator in the coolant circulation circuit of the engine including the radiator, and the divided liquid is passed through a first heat exchanger that exchanges heat with the air for blowing into the vehicle at the dividing point. The first one returns to the coolant circulation circuit on the downstream side
circuit, and the first circuit downstream of the first heat exchanger is divided by a three-way valve, and the divided liquid is passed through the pump, the second heat exchanger, and the solenoid valve to the first circuit. a second circuit connected to return to the first circuit upstream of the heat exchanger;
The second heat exchanger is a liquid cooling heat exchanger combined with an evaporator that evaporates refrigerant from the refrigerant compressor driven by the engine, and during heating operation, part of the liquid from the radiator is of the first three-way valve, the first heat exchanger, and the second three-way valve by returning the coolant to the coolant circulation circuit.
The heat exchanger acts as a radiator, and during cooling operation, the liquid in the first circuit divided by the second three-way valve is cooled by the second heat exchanger, and the liquid flows into the first heat exchanger. The first heat exchanger is made to act as a cooler by supplying a liquid to the first heat exchanger, and a part of the liquid is also supplied to the first heat exchanger from the first three-way valve, so that the amount of liquid substantially equal to the amount supplied is Add the same amount of liquid to the second
An air conditioner for a vehicle, characterized in that the coolant can be returned to the circulation circuit from the three-way valve.