JPS60240976A - 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 the Invention The present invention relates to a forced draft type refrigerator, etc., in which a part of the freezer compartment is provided with a rapid freezing device equipped with a direct cooling type auxiliary cooler.

The structure of the conventional example and its problems The conventional example will be explained with reference to FIGS. 2 and 3. Reference numeral 1 denotes a main cooler 4 housed in a cooling chamber 3 configured within a compartment 2, and the refrigerator is a forced draft type refrigerator in which cooled air is circulated through a freezer compartment 6 and a refrigerator compartment 7 using a blower 5. Reference numeral 6' denotes a quick-freezing room which is provided with an auxiliary cooler 8 of a direct cooling type separately within the freezer room 6, and allows food to be quickly frozen.

Note that a damper thermostat 14 is provided at the entrance of the refrigerator compartment 7 to adjust the flow rate of cold air.

As shown in Fig. 2, the refrigeration cycle consists of a normal flow path that circulates between compressor 9 - condenser 10 - first capillary tube 11 - main cooler 43 and compressor 9, and compressor 9 - condenser. 10-Second capillary tube 12-Auxiliary cooler 8-Main cooler 4-
It is equipped with a flow path control device 13 (hereinafter referred to as flow path control valve 13) that switches between the compressor 9 and a circulating flow path for quick freezing, and performs a quick freezing action by switching the flow path of this switching valve 13. It is.

However, although the refrigerator is equipped with such a refrigeration cycle for quick freezing, the refrigerant flow path from the second capillary tube 12 to the auxiliary cooler 8 to the main cooler 4 is essentially used only when quick freezing is desired. However, the utilization of the equipment remained relatively low.

On the other hand, in a typical refrigerator, the actual amount of heat load varies depending on the outside temperature, and from the point of view of efficient equipment design, it is desirable to vary the capacity of the refrigeration cycle depending on the load condition depending on the outside temperature. Are known.

In other words, when the heat load conditions are severe and the outside temperature is high, the cooling capacity of the refrigeration cycle is set to a large value to eliminate overload operation, and when the load is light and the outside temperature is low, the cooling capacity is saved to match that, thereby reducing the amount of work. This can reduce power consumption. However, in a refrigerator with a normal refrigeration cycle, it is difficult to control the capacity as described above, and the capacity is designed so that it can demonstrate its capacity to a certain extent under high loads, so generally speaking, it is difficult to control the capacity as described above. Electric power consumption cannot be saved, and efficiency throughout the year is often insufficient.

OBJECTS OF THE INVENTION In view of the above points, the present invention aims to prevent the cooling efficiency of the refrigeration cycle from decreasing due to the load condition caused by the outside temperature in a refrigerator equipped with a rapid freezing channel.

Structure of the Invention In order to achieve this object, the present invention provides a switching means that switches the refrigerant flow path according to the outside temperature, regardless of the operation of the quick freezing device, and By utilizing the refrigeration channel even during normal operation, the refrigeration cycle equipment can be designed in advance to efficiently perform cooling with a cooling capacity that corresponds to the outside temperature load.

5 ・-・ Description of examples DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

Note that the main body structure and refrigeration cycle of the refrigerator are the same as those of the conventional refrigerator, and the explanation thereof will be omitted. In the figure, compressor 9.
The blower 5 is connected to a power source via a relay 16,
The flow path switching valve 13 is connected to a power source via a relay 16. The flow path switching valve 13 is configured to switch to the normal flow path when the excitation coil is conductive, and to switch to the rapid freezing flow path when the excitation coil is not conductive. Here, the relay 15 is configured to close its contacts when the exciting coil is energized, and the relay 16 is configured to close its contacts when the exciting coil is not energized. Next, a control device for driving these relays will be described. 17 is a temperature control device and the freezer compartment 6
A thermistor 18 provided in a part of the inside. Resistance R1, R2, R
3, R4, R5, and a core parator 19.

The output of the comparator 19 is configured to send a signal to turn the relay 15 0N10FF via an OR circuit 2o by a driver circuit (not shown) such as a transistor.

21 is a quick freezing switch, 22 is a quick cooling time tie 61.27-, and constitutes a quick freezing device 23. The quick cooling timer 22 is set to Hi during quick freezing after the quick freezing switch 21 is turned on.
It is configured to continue outputting a signal g h (hereinafter simply referred to as °H''), and always output a low signal (hereinafter simply referred to as L''') during the rest of the time. The output of the quenching timer 22 is connected to the input of the OR circuit 2o and to send a signal to turn the relay 15 on and off.
Relay 16 via OR circuit 24 and driver circuit
It is connected to 0N10FF. Reference numeral 26 denotes an outside temperature detection device, which is an outside temperature thermistor 26 installed in a part of the outer shell of the refrigerator body. Resistance R'1. R'2. R'3. R14,
R'5. It is composed of a comparator 27. The output of the comparator 27 is connected to the input of the OR circuit 24 so as to send a signal to turn the relay 16 on and off.

Next, the operational status of this configuration will be explained.

Normally, when the internal temperature of the refrigerator (freezer compartment temperature) is higher than a predetermined value, the resistance value RTH of the thermistor 18 is small and the resistance value RTH of the temperature control device 17 is higher than the resistance value RTH of the temperature control device 17. The potential at point A determined by resistor R1 becomes higher than the potential at point B determined by resistors R2 and R3, and the output of comparator 19 becomes "H".
The output of the R circuit 2o also becomes "H"', and the relay 15 becomes O through a driver circuit such as a transistor (not shown).
N, compressor 9. At this time, when the blower 5 is operating, the 0N10FF state of the relay 16 is related to the outside air temperature at that time. That is, if the outside air temperature is lower than a predetermined value, the resistance value RIrH of the outside temperature thermistor 26 of the outside air temperature detection device 25 increases, and the potential at point A' determined by the resistance value "TH" of the thermistor 26 and the resistance value becomes Since the potential at point B' determined by resistor 1 (4, R', and
Since the quick freezing switch 21 is not pressed at this time, the output of the quick cooling timer 22 is "L", and therefore both inputs of the OR circuit 24 are "L II", so the relay 16 is OFF, that is, The suction coil of the flow path switching valve 13 is energized, and the refrigerant circuit is connected to the compressor 9-condenser 1.
o - A normal circulation cycle of the first capillary tube 11 - main cooler -> compressor 9 is constructed to cope with light loads, save all cooling power, and reduce the operating input of the compressor.

On the other hand, in the case described above, when the outside air temperature is higher than the predetermined value, the resistance value RTH' of the outside air temperature thermistor 26 of the outside air temperature detection device 25 becomes small, and the resistance value RT of the thermistor 26 decreases.
The potential at point A' determined by H' and resistor R1' is
2' and R3', and the output of the comparator 27 becomes °H°', so the OR circuit 2
4, the relay 16 is turned on, the flow path switching valve 13 is de-energized, and the refrigerant circuit is compressor 9 → condenser 10 → second capillary tube 12 → auxiliary cooler 8 → main cooler 4 → compressor 9 to the annular flow path for rapid freezing to exhibit cooling capacity during high loads, and to suppress a significant increase in the operating rate due to insufficient capacity, that is, an increase in the power consumption of the compressor.

Regarding the quick freezing operation, when the quick freezing switch 21 is arbitrarily turned on, the output of the quick cooling timer 22 becomes nHn during the predetermined rapid cooling time, regardless of the signal from the outside temperature detection device 26 (OR circuit 24 is The relay 16 is turned ON through the auxiliary cooler 8 to perform quick freezing by turning on the flow path switching valve and switching to the quick freezing channel. At this time, the output of the quick cooling timer 22 is "H" As a result, the OR circuit 2o becomes ``H'' regardless of the temperature control device 17, so the relay 15 is forcibly turned on and the compressor 9 and blower 6 are operated continuously to further enhance the cooling effect.

Next, if the inside of the refrigerator is cooled to a certain temperature during normal operation,
Since the resistance value RTH of the thermistor 18 becomes large and the A potential of the temperature control device 17 becomes smaller than the B potential, the output of the comparator 19 becomes "L"', and the output of the quenching timer 22 becomes "L"'. '' together with the OR circuit 2o
The output of the compressor 9 also becomes ゛°L, so the relay 16 is turned off and the compressor 9. The blower 5 stops. Thereafter, this operation is repeated to select a refrigerant flow path having a cooling power according to the outside air temperature and perform a cooling operation.
By designing the flow path resistance to be larger than the flow path resistance, when the outside temperature is high, the flow path is switched to the rapid freezing flow path and the cooler capacity increases, but the condenser's evaporation temperature decreases because the capillary throttling effect is A correspondingly low temperature is obtained, and a given capacity is obtained without increasing the work or input of the compressor. On the other hand, when the outside temperature is low, the flow resistance of the first capillary tube in the normal flow path is small, so the refrigerant circulation capacity is ensured, and the condenser capacity becomes relatively excessive, especially at low outside temperatures, resulting in high pressure. This prevents a significant drop in cooling efficiency due to insufficient circulation.

As is clear from the structure of the invention, the present invention provides a quick freezing compartment in which a direct cooling type auxiliary cooler is installed in the freezer compartment of a forced ventilation type refrigerator-freezer. The refrigerant flows through the main cooler and the auxiliary cooler, and during normal cooling, the flow path control device switches the refrigerant between the main cooler and the auxiliary cooler depending on the outside temperature. Something.

By making good use of the rapid freezing channel, the system automatically selects and operates a refrigerant channel that has a cooling power according to the load conditions based on the outside temperature, so it is possible to operate the system by automatically selecting a refrigerant channel that has a cooling power according to the load conditions based on the outside temperature. By designing a refrigeration cycle in advance, it is possible to avoid operating a combination of systems that are unavoidably inefficient due to their inability to respond to changes in outside air temperature. By selecting combinations, it is possible to provide a refrigerator with a refrigeration cycle that always has high cooling efficiency against changes in outside temperature, and in combination with the original rapid freezing function, the practical effect is extremely high.

[Brief explanation of drawings]

FIG. 1 is a control circuit diagram showing an embodiment of the present invention, FIG. 2 is a sectional view of a conventional refrigerator, and FIG. 3 is a refrigeration cycle piping diagram thereof. 3... Cooling room, 4... Main cooler, 5.
...Blower, 6...Freezer compartment, 6'...
...Quick freezing room, 7...Refrigerating room, 8...
...Auxiliary cooler, 9...Compressor, 13...
・Flow path control device, 21... Rapid freezing switch,
23... Rapid freezing device, 26... Outside air temperature detection device. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 1 / Figure 3

Claims (2)

[Claims] (1) A blower that circulates the air cooled by the main cooler installed in the cooling room to the freezer and refrigerator compartments, a quick freezing room through which the air cooled by the main cooler installed in the freezer room passes; A direct cooling type auxiliary cooler placed in a quick freezing chamber, a flow path control device that controls whether the refrigerant flows only to the main cooler or to both the main cooler and the auxiliary cooler, and a refrigeration cycle. A quick freezing device that continuously operates a compressor that constitutes a part of the device and operates the flow path control device to continuously flow refrigerant to the auxiliary cooler to perform quick freezing, and detects outside air temperature; A refrigerator comprising means for operating the flow path control device to switch the refrigerant flow path in accordance with outside air temperature, regardless of the operation of the quick freezing device. (2) The switching means that switches the refrigerant flow path according to the outside temperature is configured so that when the outside temperature is high, the refrigerant flows through both the main cooler and the auxiliary cooler, and when the outside temperature is low, the refrigerant flows only through the main cooler. A refrigerator according to claim 1.