JPS5821187B2 - Refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration system that maintains condensing pressure stably without being affected by changes in outside temperature.

In conventional refrigeration systems, the condensing pressure is detected and the condenser blower is turned off or a condensing pressure regulating valve is provided on the outlet side of the condenser to keep the condensing pressure stable.

In the former case, the pressure fluctuation is fast and the blower is 0N.
-The OFF frequency increases and the life of the control parts decreases.

In the latter case, an amount of refrigerant is required to match the low outside temperature in winter, and the capacity of the liquid reservoir increases accordingly.

Furthermore, the operating time of the condensing pressure regulating valve becomes longer due to sudden fluctuations such as when heat reclaim is used, and the discharge gas enters the liquid reservoir, deteriorating the cooling effect.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a refrigeration system that can stably maintain condensing pressure without being affected by changes in outside temperature and can operate with a normal amount of refrigerant used. be.

The present invention will be described below with reference to embodiments shown in the drawings.

1 is a refrigerant compressor, 2 is a condenser, 3 is a liquid reservoir, 4 is a pressure reducing mechanism such as an expansion valve, 5 is an evaporator, and 6 is a gas-liquid separator, which are connected by piping to form a refrigeration cycle. There is.

The condenser 2 includes a first condenser 9 equipped with a blower 8 controlled by a high-pressure switch 7, a solenoid valve 11 and a blower 12 controlled by an outside temperature thermoswitch 10, and the solenoid valve 11 and the blower 12. A second condenser 14 is connected in parallel to the first condenser 9 via a check valve 13.

15 is a condensing pressure regulating valve provided between the condenser 2 and the liquid reservoir 3, and forms a bypass circuit 16 between it and the discharge side of the refrigerant compressor 1.

The condensing pressure regulating valve 15 operates under normal ambient temperature conditions.
The liquid refrigerant flowing out of the condenser 2 passes through this regulating valve 15 and enters the liquid reservoir 3.

On the other hand, when the discharge pressure falls below the set pressure of the regulating valve 15 due to a drop in the outside temperature, the regulating valve 15 is activated and the discharged gas passes through the bypass circuit 16 and enters the regulating valve 15 .

Therefore, the liquid refrigerant flowing out from the condenser 2 is throttled and accumulates in the condenser 2.

When liquid refrigerant accumulates in the condenser 2, the effective heat exchange capacity decreases and the condensing pressure increases to return to a constant set pressure.

Next, the operation in the above configuration will be explained.

First, when the outside temperature is extremely high (spring/summer conditions, etc.), the condensing pressure regulating valve 15 operates less, and the refrigerant gas discharged from the refrigerant compressor 1 is branched into the first condenser 9 and the second condenser 14. The liquid flows into the tank, condenses, passes through a liquid reservoir 3 and an expansion valve 4, and is vaporized in an evaporator 5 to perform a cooling effect.

Thereafter, it returns to the refrigerant compressor 1 through the gas-liquid separator 6 and performs normal refrigeration cycle operation.

When the discharge pressure becomes lower than the set pressure of the condensing pressure regulating valve 15 due to a drop in the outside temperature, the regulating valve 15 is activated and the discharged gas passes through the bypass circuit 16 to the regulating valve 15.
Enter.

As a result, liquid refrigerant accumulates in the first condenser 9 and the second condenser 14, and the condensing pressure increases to return to a constant set pressure.

FIG. 2 shows that the first and second
9 is a characteristic diagram of the amount of refrigerant accumulated in both condensers 9 and 14 and the outside temperature. At the temperature of point C in the figure, half of both condensers 9.140 is filled with liquid refrigerant.

Therefore, at this point, the total amount of refrigerant can be reduced by activating the outside temperature thermoswitch 10, closing the solenoid valve 11, and turning off the blower 12.Fine adjustments to the high pressure can be made using the condensing pressure regulating valve 15. There are few stops.

Furthermore, since the blower 8 of the first condenser 9 is turned ON and OFF by the high pressure switch 7 that senses the high pressure, more fine pressure adjustment can be performed.

In this case, it is better to set the operating value of the high pressure switch 7 to be a little lower than the set pressure of the condensing pressure regulating valve 15 in terms of the frequency at which the blower 80 starts and stops.

Furthermore, even when hot gas defrosting or the like is performed, the total volume of the condenser is reduced, thereby preventing a drop in high pressure.

As described above, the present invention provides a refrigeration system configured by connecting a refrigerant compressor, a condenser, a liquid reservoir, a pressure reduction mechanism, an evaporator, and a gas-liquid separator, in which the condenser has a blower controlled by a high-pressure switch. and a second condenser, which is connected in parallel to the first condenser through the solenoid valve and includes a solenoid valve that is closed at low temperatures by an outside temperature thermoswitch and a blower that is stopped. Since the condensing pressure regulating valve is provided on the outlet side of both condensers, the condensing pressure can be kept constant without being affected by changes in outside temperature, and the characteristics of the condensing pressure regulating valve are There is no need to add additional refrigerant when the outside temperature is low (winter), and stable condensing pressure can be obtained with the amount of refrigerant during the intermediate period, allowing for good operation.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram of a refrigeration system according to the present invention, and FIG. 2 is a characteristic diagram of the amount of refrigerant accumulated in a condenser and the ambient temperature of the condenser. 9...first condenser, 14...second condenser, 7...
High pressure switch, 10...Outside temperature thermo switch, 11
...Solenoid valve, 8,12...Blower, 15...Condensing pressure regulating valve.

Claims (1)

[Claims] 1. In a refrigeration system configured by connecting a refrigerant compressor, a condenser, a liquid reservoir, a pressure reduction mechanism, an evaporator, and a gas-liquid separator, the condenser is a first condenser equipped with an air blower controlled by a high-pressure switch. and a second condenser, which is connected in parallel to the first condenser via the solenoid valve, and includes a solenoid valve that is closed at low temperatures by an outside temperature thermoswitch, and a blower that is stopped. A refrigeration system comprising a condensing pressure regulating valve on the outlet side of the refrigeration system.