JPH05162534A - Air conditioning and refrigerating device - Google Patents

Abstract

PURPOSE:To realize a refrigerant circulating system in a small space at a low cost by dividing an air conditioning refrigerant flow passage at a downstream position of a receiver, and, providing a refrigerating refrigerant flow passage, which is extended to a compressor through an expansion valve and an evaporator, and which is furthermore extended to the intake side and the discharge side of an air conditioning compressor through a first and a second switching valves. CONSTITUTION:An air conditioning refrigerant flow passage P1 is divided at a position downstream of a receiver 3 to provide a refrigerant flow passage P2, which is extended to a compressor 1B through an expansion valve 4B and an evaporator 5B and which is furthermore extended to the intake side and the discharge side of an air conditioning compressor 1A through a solenoid valve 6A and a check valve 6B. When the solenoid valve 6A is opened, a part of the refrigerant of the refrigerant flow passage P1 is flowed into the refrigerant flow passage P2, and the refrigeration is started with heat exchange by the refrigerating evaporator 5B. Since the refrigerating low pressure after passing the refrigerating evaporator 5B is compressed to the air conditioning low pressure of the intake side of the air conditioning compressor 1A, which is a little higher than the refrigerating low pressure after passing the refrigerating evaporator 5B, the operation quantity of the refrigerating compressor 1B is small, and the refrigerating compressor 1B can be driven by a motor or the like easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling and refrigerating apparatus which can be suitably used for a passenger car equipped with a refrigerator for beverages and the like.

[0002]

2. Description of the Related Art A cooling / refrigerating (refrigerating) device for cooling and refrigerating at the same time has been conventionally used in refrigerating vehicles and the like. The cooling and refrigerating compressors are provided to independently configure the refrigerant circulation system.

[0003]

However, the capacity of a refrigerator in a passenger car or the like is much smaller than the cooling capacity of the passenger compartment, and it is space-consuming to provide a refrigerant circulation system for the refrigerator separately from that for cooling. And there is a lot of waste in terms of cost. Further, with the increase in engine accessories in recent years, it is difficult to secure a space for further adding an engine-driven compressor for a refrigerator.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cooling and refrigerating apparatus which can realize a refrigerant circulation system for refrigeration at a low cost and in a small space.

[0005]

The structure of the present invention will be described. A cooling compressor 1A, a condenser 2, a receiver 3, a cooling expansion valve 4A, and a cooling evaporator 5A.
A cooling medium flow path P1 for returning to the cooling compressor 1A is provided, and the cooling medium flow path P1 is branched at a position downstream of the receiver 3 to expand the refrigeration expansion valve 4
B, the refrigeration evaporator 1B, the refrigeration compressor 1B, and the refrigeration compressor 1B. A coolant channel P2 for use is provided.

[0006]

In the above structure, the refrigerant flow path P is provided during cooling.
When the refrigerator is started to be refrigerated while the refrigerant is flowing through 1, the first opening / closing valve 6A is opened and the second opening / closing valve 6B is opened.
Close. As a result, a part of the refrigerant in the refrigerant passage P1 flows into the refrigerant passage P2, and refrigeration is started by heat exchange in the refrigeration evaporator 5B.

During this refrigeration, the refrigeration compressor 1B supplies the refrigeration low pressure after passing through the refrigeration evaporator 5B,
Since it is sufficient to compress to a cooling low pressure on the suction side of the cooling compressor 1A which is slightly higher than this, the work load at this time is small, and the cooling compressor 1B can be easily driven by a motor or the like.

Thus, the cooling condenser circulation system is simplified by sharing the cooling condenser 2 and the receiver 3 and the motor of the refrigeration compressor 1B can be driven to prevent an increase in the number of engine accessories. ..

[0009]

EXAMPLE In FIG. 1, a large capacity (for example, 150 cc /
Rotation) cooling compressor 1A, condenser 2, receiver 3, cooling expansion valve 4A, as indicated by the solid line arrow in the figure.
A cooling medium flow passage P1 for returning to the compressor 1A via the cooling evaporator 5A is provided.
1 is branched off, and as shown by the broken line arrow in the drawing, the refrigeration expansion valve 4
B, a small capacity (for example, 5c) via the refrigeration evaporator 5B.
A refrigerating medium flow path P2 is provided to the refrigerating compressor 1B (c / revolution). This refrigerant flow path P2 is connected to the suction side of the compressor 1A from the compressor 1B via a solenoid valve 6A which is a first opening / closing valve, and is connected to the discharge side of the compressor 1A via a check valve 6B which is a second opening / closing valve. ing. The check valve 6B prevents a backflow from the discharge side of the compressor 1A to the discharge side of the compressor 1B. The compressor 1A is rotatably driven by a belt suspended on an engine (not shown), while the compressor 1B is rotatably driven by a motor 11.

During cooling, the compressor 1A rotates, the refrigerant is compressed to 12 to 15 Kg / cm2, and the condenser 2
It is liquefied by and reaches the expansion valve 4A. The refrigerant is adiabatically expanded to 1.8 to 3 Kg / cm @ 2 by the expansion valve 4A, and heat is exchanged with the conditioned air by the evaporator 5A to cool it. At this time, the solenoid valve 6A is in a closed state.

When using a refrigerator, the solenoid valve 6A is used.
Is opened and the compressor 1B is driven by a motor to allow a part of the refrigerant to flow into the expansion valve 4B from the refrigerant passage P1 downstream of the receiver 3. Refrigerant is about 0.5 kg / cm2 in expansion valve 4B
Is adiabatically expanded to heat in the evaporator 5B with the air in the refrigerator to cool it. Above compressor 1
B is about 0.5 Kg / cm2 after passing through the evaporator 5B.
Since the refrigerant is supplied to the suction side of the compressor 1A,
It may be compressed to 1.8 to 3 Kg / cm @ 2, and its work amount is sufficiently small. In recent years, the cooling system is often used year-round in consideration of solar radiation or for the purpose of dehumidification and the like, so that the effect is great.

When the cooling is stopped and only the refrigerator is used, the solenoid valve 6A is closed. Although the refrigerant bypasses the compressor 1A via the check valve 6B and reaches the condenser 2 directly, this condenser 2 has a large capacity used for cooling, so a small amount of refrigerant supplied from the compressor 1B radiates heat sufficiently. The pressure is reduced to about 5-8 Kg / cm @ 2. Therefore, also in this case, the compression work of the compressor 1B becomes sufficiently small.

In this way, the structure of the refrigerant circulation system can be simplified by sharing a part of the refrigerant channel P1 for refrigeration with that for cooling, and the work of the refrigeration compressor 1B can be improved. Is reduced and the motor can be driven, so that the number of engine accessories does not increase.

In the above embodiment, the check valve 6B may be replaced by a solenoid valve, and the refrigeration compressor may be driven by the engine when there is a space around the engine. A check valve may be used as the solenoid valve 6A.

[0015]

As described above, the cooling and refrigerating apparatus of the present invention is
The whole can be realized at a low cost and in a small space, and is suitable when a small refrigerator is installed in a passenger car.

[Brief description of drawings]

FIG. 1 is a refrigerant circulation system diagram of a cooling and refrigerating apparatus.

[Explanation of symbols]

 1A Cooling compressor 1B Refrigeration compressor 2 Condenser 3 Receiver 4A Cooling expansion valve 4B Refrigeration expansion valve 5A Cooling evaporator 5B Refrigeration evaporator 6A Electromagnetic valve (1st opening / closing valve) 6B Check valve (2nd opening / closing valve) P1 Refrigerant flow path for cooling P2 Refrigerant flow path for refrigeration

Claims (1)

[Claims] 1. A cooling refrigerant passage is provided from a cooling compressor to a cooling expansion valve via a condenser and a receiver to a cooling evaporator and returns to the cooling compressor, and the cooling refrigerant passage is provided downstream of the receiver. It branches at a position to reach a refrigeration compressor via a refrigeration expansion valve and a refrigeration evaporator, and the suction side and the discharge side of the refrigeration compressor from the refrigeration compressor via a first opening / closing valve and a second opening / closing valve, respectively. An air conditioner refrigerating device, which is provided with a refrigerant flow path for refrigeration up to.