JPS6060462A - 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 Field of Industrial Application The present invention provides two
It relates to refrigeration equipment such as temperature type refrigerators.

Structure of the conventional example and its problems As shown in FIG. 1, a conventional general refrigerant circuit related to the present invention supplies refrigerant by a compressor a through a condenser b, a capillary tube C, and a freezer compartment evaporator d. , supplied to the refrigerator compartment evaporator e,
These are cooled at the same time, and the temperature inside the refrigerator is controlled by a compressor (a) installed in the refrigerator compartment (not shown).
This is to perform N10FF control. Here, f is a check valve that prevents high-temperature, high-pressure gas in the compressor a from evaporating in the freezer compartment 2gd and backflowing into the evaporator e for the refrigerator compartment when the compressor a is stopped. It is disposed between John line q and compressor a. 1 is a solenoid valve for cutting high-temperature, high-pressure gas; it is opened only when compressor a is in operation, and when compressor a is stopped, high-temperature refrigerant in the condenser flows into both evaporators d and e.
This prevents the flow to.

In such devices, defrosting of the refrigerator compartment evaporator e is generally performed every cycle when the compressor a is stopped, and conventionally, the defrosting of the refrigerator compartment evaporator e is performed near the refrigerator compartment evaporator e. When the frost heater hnyo9 and the compressor a were stopped, electricity was applied to defrost every cycle.

However, in the current environment where energy conservation is becoming more and more popular, the power consumption of heaters cannot be ignored.

Purpose of the Invention The purpose of the present invention is to reduce the power consumption of the defrosting heater when the compressor is stopped, which is a drawback of the conventional example, by providing a defrosting heater for the refrigerator compartment without having a thermal effect on the evaporator for the freezing compartment. The purpose is to defrost the evaporator.

Structure of the Invention In order to achieve this objective, a pressure on/off valve is installed between the two evaporators for the freezer compartment and the evaporator for the refrigerator compartment, and when the compressor is stopped,
The high-temperature, high-pressure refrigerant in the compressor is guided only to the evaporator for the refrigerator compartment.
Defrosting is performed using the amount of heat released when the refrigerant condenses in the evaporator for the refrigerator compartment, eliminating the need for a defrosting heater in the evaporator for the refrigerator compartment. This is to prevent this from happening.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 2, 1 is a rotary compressor (high pressure type inside the outer shell);
2 is a condenser, 3 is a capillary tube, 4 is an evaporator for the refrigerator compartment, and 5 is a pressure opening/closing valve that prevents the high-temperature, high-pressure refrigerant in the rotary compressor 1 from flowing back into the evaporator 4 for the freezer compartment; This is installed between the refrigerator compartment evaporator 4 and the refrigerator compartment evaporator 6.

This pressure on/off valve 6 is connected to the freezer compartment evaporator 4 as shown in
5C has an inlet nozzle 5a connected to the outlet of the refrigerator compartment evaporator 6, and an outlet nozzle 5b connected to the outlet of the refrigerator compartment evaporator 6. Earphram 5e
The rod 5 (is a ball valve provided at the tip of the rod 5e, and 6q is an ear valve 1 long) connected to the rod 5, and one end of a conduit 7 is connected to the pressure equalizing chamber 5h on the side opposite to the ball valve 6f of the diaphragm 5e. The other end is connected to the Zakujo line 1a. When the pressure in the Zaku/I Klein 1a decreases due to the operation of the compressor 1, the pressure in the pressure equalization chamber 5h decreases through the conduit 7, and this causes the
Leu-ji-5475N valve note 5G becomes open circuit state. Furthermore, when the compressor 1 stops and the pressure in the suction line 1ac4+ increases, the conduit 7
The pressure in h increases, which causes the ball valve 5f force;/<
It is in close contact with the loop fan) 5c and becomes a closed circuit state.

Reference numeral 8 denotes a solenoid valve disposed on the outlet side of the condenser 2, which is opened when the compressor 1 is in operation and closed when the compressor 1 is stopped.

The operation in such a configuration will be explained. The temperature inside the refrigerator is controlled by a thermostat installed in the refrigerator compartment.・Detected by a temperature sensing part (not shown),
The rotary compressor 1 is controlled to be 0N10FF.

When the thermostat is ON, the refrigerant is supplied by the rotary compressor 1 to the freezer compartment evaporator 4 via the condenser 22 and the capillary tube 3, and further supplied to the refrigerator compartment evaporator 6 via the pressure on-off valve 5. Cool the freezer compartment and refrigerator compartment (both not shown).

When the temperature sensing part of the thermostat becomes lower than the set temperature, the thermostat is turned off and the rotary compressor 1 is stopped. When the rotary compressor 1 is stopped 1, the airtightness between the high and low pressures that is maintained during operation is broken due to its basic structure, and the high temperature and high pressure refrigerant in the outer shell flows to the low pressure side as shown by the broken line arrow in Fig. 2. That is, the water flows backward through the suction tube 1a and flows back into the refrigerator compartment evaporator θ. The high-temperature, high-pressure refrigerant that has flowed back is sequentially condensed in the refrigerator compartment evaporator θ, and the heat dissipated at this time removes nf. At this time, the pressure opening/closing valve 5 closes the υ ball valve 6f due to the pressure increase in the pressure equalization chamber h, and prevents the high temperature and high pressure refrigerant from flowing back into the freezer compartment evaporator 4, so that the temperature of the freezer compartment increases. There is no danger of it rising. Then, as deregistration by the high-temperature, high-pressure refrigerant progresses and the surface temperature of the refrigerator compartment evaporator 6 reaches the set temperature (0°C or higher), the thermostat is turned on again, and defrosting is completed and the rotary compressor 1 is turned on. starts cooling operation. At the same time, the pressure in the conduit γ of the pressure on/off valve 5 becomes lower than the set pressure.
The circuit is opened and a normal refrigerant circulation circuit is established.

As is clear from the above explanation, in this embodiment, the high-temperature, high-pressure refrigerant in the rotary compressor 1 is guided into the refrigerator compartment evaporator 6 for defrosting every cycle when the compressor is stopped. be.

In addition, under low outside temperatures, the high-temperature, high-pressure backflow refrigerant becomes an appropriate load, prevents the compressor operating rate from dropping drastically, and prevents the freezer compartment temperature from rising, which is consistent with reality. This is what I did.

Effects of the Invention The present invention installs a pressure on/off valve between the evaporator for the freezer compartment and the evaporator for the refrigerator compartment, and supplies the high-temperature, high-pressure refrigerant of the high-pressure compressor inside the shell to the refrigerator compartment evaporator when the compressor is stopped. Since the defrost is carried out by directing the defrost to the evaporator, there is no need for a defrost heater as in the past, or only a small amount of heat is required, which has two great effects: energy saving.

[Brief explanation of the drawing]

FIG. 1 is a refrigerant circuit diagram of a conventional refrigeration system, FIG. 2 is a refrigerant circuit diagram showing an embodiment of the refrigeration system of the present invention, and FIG. 3 is a sectional view of a pressure opening/closing valve. 1... Single-rotation compressor, 2... Condenser, 3...
... Capillary tube, 4 ... Evaporator for freezer compartment, 5 ...
Pressure on/off valve, 6...Evaporator for refrigerator compartment, 7...
・・Conduit for pressure on/off valve, 1a・・Suction line. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure/C Figure 2/ Figure 3

Claims (1)

[Claims] A high-pressure rotary compressor inside the outer shell, a condenser, a capillary tube, an evaporator for the freezer compartment, an evaporator sump line for the refrigerator compartment, etc. are connected and piped in sequence, and the evaporator for the freezer compartment and the evaporator for the refrigerator compartment are connected in sequence. A refrigeration system further comprising a pressure on-off valve that closes in response to pressure fluctuations in the suction line that occur when the rotary compressor is stopped.