JPS5912515Y2 - Refrigeration equipment - Google Patents

Description

[Detailed explanation of the invention] This invention does not require a special heat source and can defrost using liquid refrigerant, and also enables defrosting using refrigerant in a refrigeration system with one cooler per compressor. Regarding the refrigeration system that has been used, the present invention will be described in detail below based on the drawings of the embodiments.

Fig. 1 shows the first embodiment of the present invention. In the figure, numeral 1 is a compressor, 2 is a condenser, and 3 is a high-pressure liquid receiver located below the condenser. Liquid feed pipe 4 from the container
The branch pipe 4a is connected to a low pressure liquid receiver 6 via a liquid sending valve 5, and the other branch pipe 4b is connected to a liquid pump 8 via a switching valve 7. The liquid side (lower part) of the low-pressure liquid receiver 6 is connected to the suction side of the pump 8 through a liquid feed pipe 9 having a valve 10 for freezing.

The pump 8 is connected to the coil inlet of the cooler 12 by a liquid sending pipe 11, and the coil outlet of the cooler is connected to the return pipe 13.
and is connected to the low pressure liquid receiver 6.

In addition, the low pressure liquid receiver 6 has its gas side (upper part) connected to the suction pipe 14.
The liquid side is connected to the compressor at
The condenser 2 is connected to the condenser 2 located below the low pressure liquid receiver 6.

The first embodiment has the above-described structure, and the freezing operation is performed with the liquid feeding valve 5 and the freezing valve 10 open, and the other valves 7 and 16 closed.

By doing this, the refrigerant from the compressor 1 is transferred to the condenser 2,
High pressure liquid receiver 3, liquid sending pipe 4 with valve 5 open, branch pipe 4a
The liquid enters the low-pressure liquid receiver 6 via the liquid pipe 9 with the valve 10 open, and is then sucked into the pump 8 through the liquid pipe 9 with the valve 10 open, and is supplied to the cooler 12 by the pump 8.

The refrigerant from the cooler enters the low-pressure receiver 6 through the return pipe 13, and the gas in the receiver is sucked into the compressor 1 through the suction pipe 14, where it is compressed and sent back to the condenser 2. Repeat being sent.

Defrost operation is performed as follows.

(1) First, the liquid sending valve 5 is closed, the low-pressure side refrigerant is recovered to the high-pressure liquid receiver 3, and when the recovery is completed, the compressor 1 and the liquid pump are stopped.

(2) Next, open the pressure equalization valve 16 to make the high pressure side and the low pressure side of the refrigerant the same pressure.

(3) Once the pressure is equalized, close the valve 10, open the defrost switching valve 7, and start the pump 8.

As a result, the refrigerant liquid in the high-pressure liquid receiver 3 is sent to the cooler 12 by the pump 8 via the liquid sending pipe 4 and the branch pipe 4b, thereby defrosting the cooler.

The defrosted refrigerant is then transferred to the low pressure liquid receiver 6 through the return pipe 13.
The liquid then enters the condenser through the bypass pipe 15, is reheated, returns to the high-pressure liquid receiver 3, and is sent to the cooler 12 again by the pump 8.

As described above, according to the present invention, defrosting is performed using the refrigerant liquid stored in the high-pressure liquid receiver, so no other heat source is particularly required for defrosting, and the compressor is not used during defrosting. Since it is stopped, power consumption can be saved during defrosting, and defrosting can be performed economically.

Further, according to the present invention, one cooler 11 is installed for one compressor.
Defrosting using a refrigerant is now possible in a refrigeration system with a small size, which not only makes the equipment more compact and simplifies the piping system, but also allows conventional liquid pump systems to be used with only minor modifications. .

Furthermore, the defrosted refrigerant discharged from the cooler passes through the low-pressure liquid receiver 6 and then into the condenser 2 where it is reheated, so there is no shortage of heat for defrosting.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a device according to the present invention. In the figure, 1... Compressor, 2... Condenser,
3...High pressure liquid receiver, 4...Liquid sending pipe, 4
a, 4b...branch pipe, 5...liquid feeding valve,
6...Low pressure receiver, 7...Switching valve, 8
...Pump, 9...Liquid pipe, 10...
... Valve for freezing, 11 ... Liquid feed pipe, 12.
...Cooler, 13...Return pipe, 14...
... Suction pipe, 15 ... Bypass pipe, 16.
...Pressure equalization valve, 17...Auxiliary heating device.

Claims (1)

[Scope of utility model registration request] The condenser following the compressor is connected to a high-pressure liquid receiver, and the liquid sending pipe from this high-pressure liquid receiver is divided into a branch pipe having a liquid sending valve that also serves as an expansion valve, and a branch pipe having a switching valve for defrosting. The liquid side of the low pressure liquid receiver is connected to the suction side of the pump with a liquid sending pipe having a valve for freezing, and the pump is connected to a cooler. , the outlet of this cooler is connected to the low-pressure liquid receiver, the gas side of the low-pressure liquid receiver is connected to the inlet of the compressor, and the liquid side of the low-pressure liquid receiver is connected to a bypass equipped with a pressure equalization valve. A pipe is connected to the condenser at a lower level, and during refrigeration operation, the liquid sending valve and freezing valve are open and the others are closed, and during defrosting operation, the liquid sending valve is closed and the refrigerant in the low-pressure receiver is The liquid is collected through a condenser to a low-level high-pressure receiver, and when the recovery is complete, the compressor and pump are stopped, the pressure equalization valve is opened to equalize the pressure on the high-pressure side and the low-pressure side, and then the valve for refrigeration is opened. A refrigeration system that closes but opens the defrost switching valve and starts the pump.