JPS5971953A - Freezing 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 [Applications of the Invention] The present invention relates to a refrigerator-freezer, and particularly to a refrigerator-freezer having a refrigeration cycle configured to be suitable for power saving.

[Background of the invention]

The refrigeration cycle in a conventional refrigerator-freezer has a closed cycle configuration in which a compressor, a condenser, a capillary tube, an evaporator, and the like are connected through pipes. In other words, while the compressor is operating, high-temperature, high-pressure gas from the compressor is liquefied in the condenser, depressurized in the capillary tube, and evaporated in the evaporator to exchange heat. Heat exchange with the evaporator is carried out either directly on the surface of the evaporator or indirectly by forced circulation of air by a fan, and each compartment of the refrigerator-freezer is cooled in this way. When each chamber is cooled to a specified temperature, the internal thermostat stops the compressor, thereby controlling the internal temperature. However, when the compressor stops, the compressor, which had previously held the condenser at high temperature and high pressure, and the evaporator at low temperature and low pressure, are released, and the space between the condenser and evaporator becomes equal. A thickening effect occurs. That is, the high temperature, high pressure refrigerant gas and liquid in the condenser flow into the evaporator through the capillary peak, resulting in an increase in the evaporator temperature.

Therefore, when the compressor restarts operation and cools the refrigerator-freezer, it must first cool down the evaporator, whose temperature increased due to high-temperature gas and liquid from the condenser when the compressor stopped. As for the amount of heat exchange, in addition to the amount of heat leakage, the amount of heat for cooling the overheated evaporator increases. Therefore, in refrigerators with conventional refrigeration cycle configurations, the operating rate of the compressor increases, resulting in an increase in power consumption.Also, when the compressor is operating, the evaporator temperature is high, which increases the discharge air temperature. So,
Problems have also arisen, such as the load temperature inside the refrigerator becoming slightly higher.

[Object of the Invention] An object of the present invention is to eliminate the drawbacks of the prior art described above and to provide a refrigerator-freezer having a refrigeration cycle with a remarkable power saving effect.

[Summary of the invention]

In order to achieve the above object, according to the present invention, the temperature of the evaporator is increased when the compressor is stopped during a refrigeration cycle consisting of a compressor, a condenser, a capillary tube (pressure reducer), and an evaporator. The valve device that shuts off the high-temperature refrigerant from the condenser, which is the cause of
By controlling the opening and closing of the valve device in conjunction with the operation of the compressor so that it is opened when the compressor is running and closed when the compressor is stopped, condensation can be prevented when the compressor is stopped. The refrigeration cycle is configured to prevent high-temperature refrigerant from flowing into the evaporator, thereby reducing the temperature rise in the evaporator and achieving a large power saving effect.

[Embodiments of the invention]

Next, an embodiment of a refrigerator-freezer according to the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a refrigeration cycle in which a solenoid valve that operates in conjunction with the operation of a compressor is provided between a condenser and a capillary tube used in this embodiment.
FIG. 2 is a circuit diagram showing a control circuit of the refrigeration cycle. In the figure, 1 is a compressor, 2 is a condenser, 3 is a capillary tube, 4 is an evaporator, 5 is a connecting pipe that connects each device, and 6 is a fan 6A for cooling each room of the refrigerator-freezer.
7 is a normally open solenoid valve that operates in conjunction with the operation of the compressor 1, and an internal thermostat 8A that controls the compressor 1 and the like to control the temperature in each room. 8B is the contact point of the internal thermostat (8), and 9 is the power plug of the refrigerator-freezer.

The operation of the refrigeration cycle will be described below.

In FIG. 2, when the internal thermostat 8 is in contact with the contact 8A, the compressor 1, fan motor 6, etc. are in an operating state, and the condenser 2 is at high temperature and high pressure.
The evaporator 4 is a fan 6A driven by a fan motor 6.
Each compartment of the refrigerator is cooled through the refrigerator. In this case, the solenoid valve 7 is not energized, but since the solenoid valve 7 is always open and in the open state, it does not affect the refrigeration cycle in any way. If the solenoid valve is a normally closed type solenoid valve 7, it should be wired as shown by the broken line in Fig. 1 and controlled to be opened when energized together with the compressor 1, fan motor 6, etc. Can be done.

Next, when each compartment of the refrigerator-freezer is cooled to the specified temperature,
The internal thermostat) 8 is reversed and connected to the contact 8B.

As a result, the compressor 1, fan motor 6, etc. are not energized and are therefore stopped. However, the solenoid valve 7 is energized via the contact 8B and operates to close the refrigerant flow path between the condenser 2 and the cavity ceiling 3. Therefore, the high temperature refrigerant in the condenser 2 no longer flows into the evaporator 4 through the capillary tube 3 as in the conventional case.

Therefore, in the refrigerator-freezer, the total amount of heat exchange including the amount of heat leaking through the heat insulating wall is reduced, and power consumption can be reduced. According to the results of experiments conducted under certain conditions, the refrigeration cycle of the present invention can reduce the temperature rise of the evaporator by 2 degrees Celsius compared to the conventional one, and as a power saving effect, the amount of power consumed per day can be reduced. 0. I KWr (confirmed to be reduced).

FIG. 3 is a block diagram showing a refrigeration cycle used in another embodiment of the refrigerator-freezer according to the present invention.

In this embodiment, as an alternative to the electromagnetic valve 1, a heater 1 is connected to the inlet of the capillary valve 3, which is energized when the compressor 1 is stopped.
0 is set. That is, by energizing the heater 0 when the compressor 1 is stopped, the temperature at the inlet of the capillary tube 30 becomes higher than that of the condenser 2, so the resistance inside the capillary tube 3 increases and the refrigerant in the condenser 2 It has a valve action that prevents the water from flowing into the evaporator 4.

〔Effect of the invention〕

As mentioned above, according to the present invention, in the refrigerator-freezer,
A refrigeration cycle composed of a compressor, a condenser, a capillary tube, an evaporator, etc. is provided with a valve device that operates in conjunction with the operation of the compressor between the condenser and the capillary tube. is controlled to be open when the compressor is running and closed when the compressor is stopped, and the height 7 in the condenser is controlled when the compressor is stopped.

By preventing wet refrigerant from flowing into the evaporator, it is possible to prevent heat leakage into the refrigerator caused by the refrigerant in the refrigeration cycle, thereby reducing power consumption.
Since the temperature rise of the evaporator can also be reduced, temperature hunting of the load inside the refrigerator can also be reduced, which has great effects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a refrigeration cycle used in an embodiment of a refrigerator according to the present invention, FIG. 2 is a circuit diagram showing a control circuit of the refrigeration cycle shown in FIG. 1, and FIG. FIG. 2 is a configuration diagram showing a refrigeration cycle used in an example. Explanation of symbols 1...Compressor 2...Condenser 3...Capillary tube (pressure reducer) 4...Evaporator 5...Connection vibro...Fan motor 6A...Fan 7 ...Solenoid valve valve/inside thermostat 8A, 8B...Contact 9...Power plug 10...Heater attorney Junnosuke Nakamura δ. 5! P1 Figure■ 1'2 Figure 3-254-

Claims (1)

[Scope of Claims] (1+ Having a refrigeration cycle configured with a compressor, a condenser, a pressure reducer, an evaporator, etc. in a closed cycle,
In a refrigerator-freezer equipped with a control circuit that detects the temperature inside the refrigerator and controls the operation of the compressor, the circuit operates in conjunction with the start and stop of the compressor between the condenser and the pressure reducer. A refrigeration cycle is configured with a valve device that can open the refrigerant flow path during operation and close the refrigerant flow path during stoppage, and the control circuit also includes a valve device. A refrigerator-freezer characterized in that the device is provided with a valve device control means that generates a signal to open a refrigerant flow path when the compressor is in operation and to close the refrigerant flow path when the compressor is stopped. (2) The refrigerator-freezer according to claim 1, wherein the valve device is a solenoid valve that operates in conjunction with the operation and stop of the compressor.