JPH024170A - Refrigerating cycle - Google Patents

Abstract

PURPOSE:To supply a low cost, and simple refrigerating cycle by using an air separator on the outlet side of a condenser of a refrigerating cycle and controlling refrigerant with a single solenoid valve. CONSTITUTION:During ordinary operation, a first solenoid valve 5 is opened. The refrigerant discharged from a compressor 1 is introduced to a pressure reducing device 10 by way of a condenser 2, and separated into liquid phase and air phase. The separated refrigerant is introduced to an air separator 9 by way of a refrigerant pipe 12. The refrigerant is separated into a vapor drain side 11 and a liquid drain side 13 in the air separator 9. There are two circuits available, One is the circuit where the cooling medium flows from the vapor drain side 11 to a pressure reducing device 7 while the other is the circuit where it flows from the liquid drain side 13 to the first solenoid valve 5. Almost every refrigerant flows to the first solenoid valve 5 where there is available the liquid refrigerant having larger specific volume. During low temperature operation, the first solenoid valve is closed. The refrigerant introduced to the air separator 9 is adapted to flow only to a refrigerant pipe 11' installed to the vapor drain side 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigeration cycle that uses an auxiliary cooler to obtain a low temperature.

2. Description of the Related Art A conventional refrigeration cycle for obtaining a low temperature will be explained with reference to FIG.

Conventionally, in order to obtain a low temperature in a refrigeration cycle used in a refrigerator-freezer or the like, an auxiliary cooler for low temperatures is used in addition to a main cooler for cooling the inside of the refrigerator.

Hereinafter, a conventional refrigeration cycle will be explained using FIG. 2.

1 is a compressor and 2 is a condenser. Then, a pressure reducer 4 is installed to flow the refrigerant to the main cooler 3 for normal cooling.
A first solenoid valve 6 is provided for switching between the refrigerant circuit and the refrigerant circuit. A second solenoid valve 6 for switching refrigerant, a pressure reducer 7 having a higher resistance than the pressure reducer 4, and an auxiliary cooler 8 are provided between the first electromagnetic valve 6 and the condenser 2.

Next, the operation will be described. During normal cooling operation, only the first solenoid valve 6 is open, and the refrigerant discharged from the compressor 1 passes through the condenser 2, the first solenoid valve 6, the pressure reducer 4, and the main cooling. It is guided to the container 3 and cools the inside of a refrigerator-freezer or the like.

When a low temperature is desired, only the second solenoid valve 6 is opened, and the refrigerant is guided through the second solenoid valve 6 to the pressure reducer 7 and the auxiliary cooler 8, which have a high resistance. . At this time, since the resistance of the pressure reducer is large, an evaporation temperature closer to the original temperature can be obtained. In this way, for example, auxiliary coolers are often used to freeze and cook foods at low temperatures and reduce the amount of food dripping during thawing and improve quality.

Problems to be Solved by the Invention However, the above-mentioned refrigeration cycle requires two solenoid valves for refrigerant switching, which has the problem of increasing the cost of the solenoid valves and complicating the control circuit.

In view of the above problems, the present invention provides an inexpensive and simple refrigeration cycle.

Means for Solving the Problems In order to solve the above problems, a gas-liquid separator is used on the condenser outlet side of the refrigeration cycle, and the refrigerant is controlled using a single solenoid valve. be.

Effects According to the present invention, with the above-described configuration, liquid refrigerant flows into the main cooler during normal operation, and refrigerant flows only into the auxiliary cooler during low-temperature operation.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

Components that are the same as those in the conventional example are designated by the same numbers and the description thereof will be omitted.

9 is a gas-liquid separator, and 10 is a pressure reducer for separating the refrigerant into a liquid refrigerant and a gaseous refrigerant at an intermediate pressure in the gas-liquid separator 9.

The gas reservoir side 11 of the gas-liquid separator 9 is connected to a refrigerant pipe 12 led out from the pressure reducer 1o. Further, the gas reservoir side 11 and a pressure reducer 7 for evaporating the gas in the auxiliary cooler 8 are connected via a refrigerant pipe 11'.

Then, the liquid groove side 13 of the gas-liquid separator 9 and the first 'iFl
The magnetic valve 5 is connected via a refrigerant pipe 14 .

Next, the operation based on the above configuration will be explained using FIG. 1.

To make the explanation easier to understand, the explanation will be divided into normal operation and low temperature operation.

First, normal operation will be explained.

During normal operation, the first solenoid valve 6 is open.

First, the refrigerant discharged from the compressor 1 is guided to the pressure reducer 1o via the condenser 2. At this time, the refrigerant is depressurized to an intermediate pressure, so it is separated into liquid and gas.

The separated refrigerant is then guided to the gas-liquid separator 9 via the refrigerant pipe 12. The refrigerant guided to the gas-liquid separator 9 is divided into a gas reservoir side 11 and a liquid groove side 13 within the gas-liquid separator 9.
It is divided into two parts.

Then, it is divided into two circuits: a circuit that flows from the gas reservoir side 11 toward the pressure reducer 7 and a circuit that flows from the liquid groove side 13 toward the first electromagnetic valve 6 .

At this time, most of the refrigerant flows toward the first electromagnetic valve 6, which is a liquid refrigerant with a large specific volume. Since the refrigerant is gaseous and has a very small specific volume, only about 2% of the total amount of refrigerant flows toward the pressure reducer 7.

Then, the refrigerant from the liquid groove side 13 passes through the first electromagnetic valve 5, the pressure reducer 4, and the main cooler 3, forming one cycle of returning to the compressor 1, thereby cooling the inside of the refrigerator-freezer.

Next, operation at 1 degree Celsius will be explained.

The first solenoid valve 5 is closed during low temperature operation.

The flow of the refrigerant up to the gas-liquid separator 9 is exactly the same as during normal operation, so a description thereof will be omitted.

Since the first electromagnetic valve 6 is closed, the refrigerant guided to the gas-liquid separator 9 flows only in the direction of the refrigerant pipe 11' provided on the gas reservoir side 11.

The refrigerant that has flowed in this form returns to the pressure reducer 7, the auxiliary cooler 8, and the compressor 11, forming a cycle.

In addition, since the resistance of the pressure reducer 7 is greater than the resistance of the pressure reducer 4, the pressure is lower, and the evaporation temperature of the auxiliary cooler 8 is lower than that of the main cooler 3.

Effects of the Invention As described above, the present invention includes a condenser, a pressure reducer for generating an intermediate pressure, a first electromagnetic valve for guiding the refrigerant to the main cooler, and a first solenoid valve for flowing the reduced pressure refrigerant to the auxiliary cooler. A gas-liquid separator is installed between the pressure reducer and the first
The refrigerant pipe that leads to the solenoid valve is connected to a pressure reducer that leads from the gas reservoir side to the auxiliary cooler, so during normal operation, the first solenoid valve is only opened, and most of the refrigerant is used for main cooling. Since the refrigerant flows to the refrigerant, there is no need for a solenoid valve on the auxiliary cooler for low temperatures, which not only reduces costs but also simplifies the refrigerant control circuit.

[Brief explanation of the drawing]

FIG. 1 is a refrigeration cycle diagram of an embodiment of the present invention, and FIG. 2 is a conventional refrigeration cycle diagram. 1... Compressor, 2... Condenser, 3...
...Main cooler, 8...Auxiliary cooler, 9...
... Gas-liquid separator, 1o ... Pressure reducer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 1 ・− 2−・・ 3 ・・ 5−・ 8−・− 1・・ 10 −・・ Pressure loom 1s Yi Shu Ling 1n device O It's valve auxiliary purification tn Yiqi liquid line 6 Qi Press Yi

Claims (1)

[Claims] A compressor, a condenser, a main cooler, and an auxiliary cooler are provided in parallel with the main cooler to constitute a refrigeration cycle, and a pressure reducer for generating intermediate pressure on the outlet side of the condenser and gas-liquid separation. a solenoid valve and a pressure reducer are provided between the liquid reservoir side of the gas-liquid separator and the main cooler, and a solenoid valve and a pressure reducer are provided between the gas reservoir side of the gas-liquid separator and the auxiliary cooler. A refrigeration cycle characterized by being connected via a pressure reducer.