JPS5927161A - Refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration cycle of a refrigerator and a method of controlling the same, and particularly to a refrigerator suitable for reducing power consumption.

To explain the conventional refrigeration cycle using Fig. 1, the compressor 1
, a condenser 2, a pressure reducer 3, and an evaporator 4 are successively connected to each other by refrigerant pipes. A defrosting heater 5 is installed in the evaporator 4, and during defrosting 4, the compressor 1 is stopped, the defrosting heater is energized, and 1 air energy is converted into thermal energy to melt the frost. I am taking a method to do so. In the above-mentioned refrigeration cycle that performs defrosting, the refrigerant heated by the defrosting heater flows from the evaporator 4 to the compressor 1 or the condenser 2, so the amount of heating until the defrosting is completed is small. .

Furthermore, when the compressor uses a control method that repeats intermittent cycles, hot gas refrigerant flows into the evaporator 4 when the compressor is stopped, which increases the temperature of the evaporator 4 and heats the air around the evaporator. The purpose of the present invention is to reduce the power consumption and heat load of the defrosting heater during silk removal, and to reduce the compressor power consumption during intermittent operation. During shutdown, hot gas refrigerant from the condenser is prevented from flowing into the evaporator to suppress the temperature rise of the evaporator.
In the conventional defrosting method using a refrigeration cycle, which aims to provide a refrigerator with reduced annual power consumption, waste refrigerant heated by a defrosting heater flows from the evaporator to the compressor or condenser. Therefore, the temperature rise of the evaporator is slow and the heating time of the defrosting heater becomes long. Therefore, in order to reduce power consumption, an on-off valve is installed between the condenser and the pressure reducer.
We focused on reducing the power consumption of the refrigeration cycle by controlling the refrigerant in the evaporator so that it does not move during defrosting.

In addition, in conventional refrigerators, when the compressor is stopped during intermittent operation,
When the evaporator resists a rapid temperature rise, especially when the air temperature surrounding the condenser is at the sieve, a phenomenon was observed in which the evaporator temperature becomes lower than the air temperature surrounding the evaporator. This phenomenon is caused by the hot gas refrigerant that has become high enthalpy due to compressor operation.
This is caused by the water flowing into the evaporator, increasing the heat load and causing a large loss in the refrigeration cycle. Therefore, in the present invention, the above-mentioned on-off valve is controlled to close while the compressor is stopped during intermittent operation, thereby preventing hot gas refrigerant from flowing into the evaporator and reducing annual power consumption. I focused on this.

An embodiment of the present invention will be described below with reference to FIGS. 2, 3, and 4. 6 in Fig. 2 is an on-off valve, and 5 is a defrosting heater. During defrosting, on-off valve 6 is closed at the same time as the compressor stops, as shown in Fig. 3, and is installed in the evaporator. The defrost heater is energized to heat the evaporator and defrost it.

During this defrosting period, the refrigerant remaining in the evaporator is heated and its temperature rises, but unlike conventional methods, it does not flow into the compressor or condenser, so the defrost heater heats the evaporator and the refrigerant remaining in the evaporator. consumes less power.

In addition, when the compressor is stopped during intermittent operation of the compressor, please refer to Figure 4.
As shown, the on-off valve 6 performs a closing operation. Perform all opening operations while the compressor is operating. By performing the above control, it is possible to prevent the hot gas refrigerant in the condenser from flowing into the evaporator while the compressor is stopped, so the temperature of the evaporator does not rise rapidly and the heat load on the air surrounding the evaporator increases. can be prevented.

Therefore, according to the refrigeration cycle and its control method of the present invention, it is possible to reduce power consumption during defrosting and during intermittent operation of the compressor, and it is possible to easily start the compressor after defrosting. In the above explanation, the on-off valve has been explained, but specifically, there are "electromagnetic on-off valves", pressure-type on-off valves, temperature-type on-off valves, etc., which can exhibit the same effect.

According to the present invention, as described above, an on-off valve is provided between the condenser and the pressure reducer, and since the on-off valve performs the closing operation while the defrosting heater is energized, the air flows into the evaporator after the compressor is stopped. This has the effect of reducing the power consumption of the defrosting heater that heats a portion of the liquid refrigerant by the amount of latent heat.

In addition, by preventing the hot gas refrigerant in the condenser from flowing into the evaporator when the compressor is stopped during intermittent compressor operation,
Since the entire refrigerating capacity can be saved by the amount of enthalpy of the inflowing hot gas, the total power consumption can be reduced.

Furthermore, since power can be saved by simply installing and controlling one on-off valve, it is inexpensive, economical, and safe.

[Brief explanation of the drawing]

Figure 1 is a block diagram of a refrigeration cycle of a conventional refrigerator, Figure 2 is a diagram of a refrigeration cycle of a refrigerator according to the present invention, and Figure 3 is a diagram showing a defrosting heater, an on-off valve, and a compressor of a refrigerator according to the present invention. FIG. 4 is a diagram showing a control pattern of the on-off valve during intermittent operation of the compressor of the refrigerator according to the present invention. 1...Compressor, 2...Condenser, 3...Reducer, 4...
・Evaporator, 5. Defrost heater, 6. Open/close valve. Representative Patent Attorney Susuki 1) Toshiyuki Figure 1 (8) Ito ON Utah FF Figure 4

Claims (1)

[Scope of Claims] 1 In a refrigeration cycle in which a compressor, a condenser, a pressure reducer, and an evaporation gain refrigerant pipe are successively connected, an on-off valve is provided between the condenser and the pressure reducer, and the compressor is operated during intermittent operation. A refrigerator characterized in that an on-off valve is controlled to close during stoppage and during defrosting operation. 2. On-off valve' (i- installed between the condenser and pressure reducer and between the evaporator and compressor, and controls the on-off valve to close during compressor stop and defrosting operation in intermittent compressor operation) The refrigerator according to claim 1, characterized in that: