JPS6342288Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to high pressure reduction in an air-cooled refrigerator.

FIG. 1 is a refrigerant system diagram showing a conventional refrigeration system. In Fig. 1, 1 is a compressor, 2 is an air-cooled condenser, 3 is a discharge pipe, 4 is a liquid pipe, 5 is a check valve provided in the liquid pipe 4, 6 is a liquid receiver, and 7 is a liquid receiver. vessel 6
The pressure equalizing pipe 8 connecting the upper part and the inlet pipe of the air-cooled condenser 2 is a check valve that allows liquid to flow only in the direction of the air-cooled condenser 2 from the receiver 6 provided in the middle of the pressure equalizing pipe 7 .

Next, the operation will be explained.

The refrigerant evaporated in the evaporator (not shown) is transferred to the compressor 1.
It is compressed in the air, passes through the discharge pipe 3, and is liquefied in the air-cooled condenser 2. The liquefied refrigerant passes through the liquid pipe 4 and is stored in the liquid receiver 6. The refrigerant in the liquid receiver 6 is evaporated in an evaporator (not shown) and returned to the compressor 1. Now, the refrigerant discharged from the air-cooled condenser 2 enters the liquid receiver 6 as a mixture of liquid refrigerant and gaseous refrigerant, and the gaseous gas accumulates in the upper part of the liquid receiver 6. When the air-cooled condenser 2 is installed above the liquid receiver 6, the pressure difference between the heads of the air-cooled condenser 2 and the liquid receiver 6 is applied to the liquid receiver 6, and the gas refrigerant in the upper part of the liquid receiver 6 is As a result, the pressure in the liquid receiver 6 and the pressure inside the air-cooled condenser 2 will also rise. For this reason,
The refrigerant in the air-cooled condenser 2 will accumulate,
The heat transfer area in the air-cooled condenser 2 decreases and the pressure rises, and only when it becomes higher than the liquid receiver 6 pressure does the liquid flow through the liquid pipe 4 and into the liquid receiver 6. As a result, the pressure inside the air-cooled condenser 2 temporarily decreases again, but on the contrary, the refrigerant begins to accumulate and the pressure increases, and this state will be repeated.

In this way, the internal pressure of the air-cooled condenser 2, that is, the discharge pressure of the compressor 1, increases, which is not only inefficient and uneconomical, but also causes problems such as a high risk of high pressure being cut when the outside temperature rises in the summer. The dot was hot. In addition, as a method to improve this problem, a method has been taken in which the liquid receiver 6 and the air-cooled condenser 2 are connected to the pressure equalization pipe 7, but in this case, the ambient temperature of the air-cooled condenser 2 decreases. In this case, when the compressor 1 stops, the refrigerant in the liquid receiver 6 flows through the pressure equalization pipe 7.
through the air-cooled condenser 2, and the pressure in the receiver 6 is reduced to a saturation pressure corresponding to ambient temperature.

Note that the check valve 8 prevents the discharge gas from flowing into the liquid receiver 6 when the discharge pressure is high. When the compressor 1 is started next time, since the pressure in the liquid receiver 6 is low, the pressure in the evaporator (not shown) is lowered, and there is a possibility that the compressor 1 will have a startup failure due to a low pressure cut.

The present invention has been made to eliminate the above-mentioned drawbacks.

An embodiment of this invention shown in FIG. 2 will be described below. In Fig. 2, the difference from Fig. 1 is that the pressure equalizing pipe 7 is connected to the compressor 1.
The point is that a solenoid valve 9 is provided in series with the check valve 8, which opens the valve only during operation.

Next, the operation will be explained. Since the gaseous refrigerant in the liquid receiver 6 passes through the pressure equalization pipe 7 to the air-cooled condenser 2, the pressure in the liquid receiver 6 and the air-cooled condenser 2 is equalized, and the refrigerant in the air-cooled condenser 2 is not stagnated. The liquid goes to the receiver 6 without being accumulated. In addition, when the ambient temperature of the air-cooled condenser 2 decreases, the solenoid valve 6 closes when the compressor 1 stops, so there is no movement of refrigerant in the liquid receiver 6, and the By maintaining the pressure, even when the compressor 1 is moved next time, the evaporator (not shown) pressure does not decrease and stable operation is possible.

As described above, according to the present invention, not only can an increase in discharge pressure be prevented, but even if the ambient temperature of the air-cooled condenser drops, it can be operated without having to cut off the low pressure when restarting, and cooling failure can be prevented. Practical effects such as these can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a conventional refrigerant system diagram, and FIG. 2 is a refrigerant system diagram showing an embodiment of the present invention. In the figure, 1 is a compressor, 2 is an air-cooled condenser,
3 is a discharge pipe, 4 is a liquid pipe, 5 is a check valve, 6 is a liquid receiver, 7 is a pressure equalizing pipe, 8 is a check valve, and 9 is a solenoid valve. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A compressor that compresses a refrigerant, an air-cooled condenser that condenses the refrigerant compressed by the compressor, a liquid receiver that stores the refrigerant condensed and liquefied in the air-cooled condenser, and the air-cooled condenser. In a refrigeration system that is provided with a valve that allows flow only from the air-cooled condenser to the liquid receiver in the piping connecting the outlet and the liquid receiver, the upper part of the liquid receiver and the refrigerant inlet of the air-cooled condenser are connected. Connecting piping was provided, and a valve was installed in series in the piping to allow the refrigerant to flow only from the receiver to the inlet of the air-cooled condenser, and a solenoid valve that was linked to the compressor and opened only when the compressor was operating. A refrigeration device characterized by: