JPH09300949A - Vehicular air conditioner with accumulator cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the amount of a refrigerant to be charged, and miniaturize a receiver, by arranging a solenoid valve controller by which both solenoid valves in respective refrigerant openings are simultaneously closed for a set time after the solenoid valve on an accumulator cooling coil side is opened and operated. SOLUTION: A first solenoid valve 11 is made conductive, and a refrigerant is led to flow into an accumulator cooling coil 8. At this time, a second solenoid valve 7 is closed. After that, both solenoid valves 11, 12 are closed. The refrigerant in the cooling coil 8 is sucked by a compressor 1, and accumulated in a condenser 2 and a receiver 3. Next, the first solenoid valve 11 is closed, and the second solenoid valve 7 is made conductive, then the refrigerant is led to flow into an air conditioning evaporator 4. After that, the first solenoid valve 11 is made conductive at the same time when the second solenoid valve 7 is closed, and the accumulator cooling coil 8 is operated at the same time when the air conditioning evaporator 4 is stopped. At this time, the second solenoid valve 7 is closed, therefore the refrigerant in the air conditioning evaporator 4 is sucked by the compressor 1, and hardly remains in the evaporator 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner with a cold storage device applied to a vehicle air conditioner.

[0002]

2. Description of the Related Art FIG. 3 is a system diagram of a conventional air conditioner with a regenerator for a vehicle. 1 is a compressor, 2 is a condenser, 3 is a receiver, 4 is a direct expansion air conditioning evaporator,
5 is a second temperature type expansion valve equipped with a temperature sensitive tube 6, 7 is a second solenoid valve, 8 is a cooling coil for cold storage, 9 is a first temperature type expansion valve equipped with a temperature sensitive tube 10, Reference numeral 11 is a first solenoid valve, and 12 is a check valve.

The evaporator 4 for air conditioning and the cooling coil 8 for cold storage alternately connect the second electromagnetic valve 7 and the first electromagnetic valve 11 to alternately supply refrigerant to the evaporator 4 for air conditioning and the cooling coil 8 for cold storage. Shed. The ratio of the operating time of the air conditioning evaporator 4 to the operating time of the cold storage cooling coil 8 is, for example, 45
Second: 15 seconds.

An example of the operation pattern is shown in FIG. When the second solenoid valve 7 is turned on, the air conditioning evaporator 4 is operated, and when it is closed, the evaporator 4 is stopped. Also, the first
When the electromagnetic valve 11 is turned on, the cooling coil 8 for cold storage is operated, and when closed, the cooling coil 8 is stopped.

[0005]

In the above-mentioned conventional technique, the check valve 12 is provided in the air-conditioning evaporator operating mode so as not to apply a high low pressure during air-conditioning to the cold storage cooling coil. Cooling cooling coil 8
Almost the same amount of refrigerant accumulates in the operation.

On the contrary, in the cold storage operation mode, the refrigerant in the air conditioning evaporator 4 becomes empty. Therefore, the amount of refrigerant charged in the refrigerant circuit increases, and the receiver also needs to have a large volume, which is a drawback.

Further, when the air conditioning evaporator 4 is operated after the cold storage cooling coil 8 is stopped for a long time, the refrigerant in the cold storage cooling coil 8 is exhausted due to the leakage of the check valve 12, and this portion is stored in the receiver 3. There is a drawback in that a receiver with a large volume is needed because of the accumulation.

The present invention aims to reduce the amount of refrigerant to be charged and miniaturize the receiver.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a direct expansion type air conditioning evaporator and a cold storage cooling coil are connected in parallel to a refrigerant circuit, and the refrigerant inlet side of each of them is connected. In the air conditioner with a regenerator for vehicles, which is operated by alternately opening and closing the solenoid valve, the solenoid valve on the side of the cooling coil for cold storage is operated and then both solenoid valves are simultaneously set for a set time. The present invention relates to an air conditioner with a regenerator for a vehicle, which is equipped with a solenoid valve controller that closes only.

[0010]

1 is a system diagram of an air conditioner with a regenerator for a vehicle according to an embodiment of the present invention. In the figure, 13 is a switch, 14 is a main controller, 1
5 are various sensors such as room temperature setting device and room temperature sensor, 1
Reference numeral 6 is a solenoid valve controller. Main controller 1
Reference numeral 4 controls the compressor 1, and solenoid valve controller 16 controls the second solenoid valve 7 and the first solenoid valve 11. Since the configuration other than the above is the same as the conventional technique (FIG. 3), the description of the configuration is omitted.

FIG. 2 is an operation pattern diagram of the air conditioner. The operation of the air conditioner will be described with reference to this figure. Due to the conduction of the first solenoid valve 11, the refrigerant flows into the cold storage cooling coil 8 to be operated. At this time, the second solenoid valve 7 is closed and the air conditioning evaporator 4 is stopped. After that, the first solenoid valve 11 is closed. At this time, both solenoid valves are closed for a while. Since the refrigerant in the cooling coil 8 is sucked by the compressor 1, the refrigerant is almost completely absent in the cooling coil 8. This refrigerant is the condenser 2
Is stored in the receiver 3.

Next, after the first solenoid valve 11 is closed, after a short set time, the second solenoid valve 7 is turned on, and the refrigerant is supplied to the air conditioning evaporator 4 for operation. After that, the second solenoid valve 7 is closed, and at the same time, the first solenoid valve 11 is turned on,
The cooling coil 8 for cold storage is operated at the same time when the evaporator 4 for air conditioning is stopped. At this time, since the second solenoid valve is closed, the refrigerant in the air conditioning evaporator 4 is sucked by the compressor 1, and the refrigerant in the air conditioning evaporator 4 is almost depleted.

As described above, when the evaporator 4 for air conditioning is in operation, there is almost no refrigerant in the cooling coil 8 for cold storage, so that the amount of refrigerant charged in the refrigerant circuit can be reduced and the receiver can be downsized. Further, since the charge refrigerant amount is small, even when the air conditioning evaporator 4 is operated with the cold storage cooling coil 8 stopped for a long time, the receiver 3 can be miniaturized because the refrigerant amount accumulated in the receiver 3 is small.

[0014]

The vehicle air conditioner with a regenerator according to the present invention is provided with a solenoid valve controller that opens the solenoid valve on the side of the regenerator cooling coil and then operates both solenoid valves simultaneously for a set time. Therefore, the amount of refrigerant to be charged can be reduced and the receiver can be downsized.

[Brief description of drawings]

FIG. 1 is a system diagram of an air conditioner with a vehicle cold storage device according to an embodiment of the present invention.

FIG. 2 is an operation pattern diagram of the air conditioner.

FIG. 3 is a system diagram of a conventional air conditioner with a cold storage device for a vehicle.

FIG. 4 is an operation pattern diagram of the air conditioner.

[Explanation of symbols]

 1 Compressor 2 Condenser 3 Receiver 4 Air Conditioning Evaporator 5 Second Temperature Type Expansion Valve 6 Temperature Sensing Cylinder 7 Second Solenoid Valve 8 Cooling Cooling Coil 9 First Temperature Type Expansion Valve 10 Temperature Sensing Cylinder 11 First Solenoid Valve 12 Check Valve 13 Switch 14 Main controller 15 Sensor 16 Solenoid valve controller

Claims (1)

[Claims] 1. A direct expansion type air conditioning evaporator and a cooling coil for cold storage are connected in parallel to a refrigerant circuit, electromagnetic valves are provided on respective refrigerant inlet sides, and the electromagnetic valves are alternately opened and closed for operation. An air conditioner with a regenerator for a vehicle, comprising a solenoid valve controller that opens the solenoid valve on the side of the regenerator cooling coil and operates the solenoid valve, and then simultaneously closes both solenoid valves for a set time. With air conditioner.