JPH0336867Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention divides a first chamber and a second chamber, such as a freezer and a refrigerator, and supplies cold air to each chamber using a blower. The present invention relates to an improved configuration of a cooling refrigerator.

(b) Prior Art A conventional refrigerator of this type is disclosed in, for example, Japanese Utility Model Application No. 54-4472. That is, in this publication, a freezer compartment that is cooled to below the freezing point, e.g., -18°C on average, is formed in the upper part, and a refrigerator compartment that is maintained at a temperature higher than the freezing point, e.g., +3°C on average, is formed in the lower part. The thus cooled air is supplied to both chambers by a fan serving as a blower for cooling. The operation of the electric compressor included in the refrigeration cycle is controlled together with the fan based on the temperature of the freezing chamber by a thermostat as a temperature control device normally installed in the freezing chamber. maintained at temperature.

Inside the refrigerator, a damper device that senses the temperature of the refrigerator compartment controls opening and closing of the cold air outlet to the refrigerator compartment at predetermined upper and lower limits of temperature, for example, 5°C and 1°C, so that the average temperature is maintained on average. ing.

(c) Problems to be solved by the invention According to the above-mentioned conventional configuration, the compressor of the refrigeration cycle is controlled by the temperature of the freezer compartment, so the temperature control of the refrigerator compartment must be dependent on the temperature of the freezer compartment. do not have. Therefore, when a large heat load such as freshly cooked food is stored in the refrigerator compartment, the compressor and fan will not operate if the freezer compartment is sufficiently cold, so cold air will not be supplied to the refrigerator compartment even if the damper device is opened. First, this causes an abnormal temperature rise in the refrigerator compartment, which causes quality deterioration of other stored items.

In addition, since the freezer compartment and refrigerator compartment are opened and closed by separate doors, if the refrigerator compartment door is opened and closed frequently, even if the freezer compartment is sufficiently cold, abnormal temperatures inside the refrigerator compartment may occur. Expected to rise.

(d) Means for Solving the Problems In order to solve the problems, the present invention provides a method for controlling the operation of the electric compressor 20 according to the temperature of the first chamber 4 in the refrigerator 1, and The supply of cold air to the second chamber 5 is controlled by a damper device based on the temperature of the chamber 5, and the temperature of the second chamber 5 is higher than the upper limit temperature T _H regardless of the temperature of the first chamber 4. When the temperature exceeds the high temperature _TE , the electric compressor 20 is forced into operation and the indicator 38 is turned on.

(e) Effect According to this invention, even if the first chamber is sufficiently cold, the second chamber
If the temperature in the room reaches a predetermined abnormally high temperature, the electric compressor can be operated to achieve a cooling effect, and in this case, a warning can be issued to the user via a display.

(f) Examples Examples will be explained with reference to the drawings. FIG. 3 shows a refrigerator-freezer 1 as an example. Reference numeral 2 denotes a heat insulating box body, the interior of which is divided into upper and lower parts by a heat insulating partition wall 3, with a freezer compartment 4 serving as a first compartment in the upper part and a refrigerating compartment 5 serving as a second compartment in the lower part. ing. Reference numerals 6 and 7 designate heat insulating doors that separately open and close the front openings of the freezer compartment 4 and the refrigerator compartment 5, respectively. A cooling chamber 8 is formed within the partition wall 3, and a cooler 10 included in the refrigeration cycle is installed in the cooling chamber 8.
will be stored and installed. There is a cooling chamber 8 behind the cooler 10.
A duct 11 communicating with both chambers 4 and 5 is formed, and a blower 12 located inside this duct 11 sucks the air cooled by the cooler 10, that is, cold air, and forces it into the duct 11. burst out into laughter.
12M is a motor that drives the blower 12. The cold air blown into the duct 11 is blown out into the freezer compartment 4 through the outlet 14 and into the refrigerator compartment 5 through the outlet 15. Reference numeral 17 denotes an electromagnetic damper provided in the refrigerator 5 to open and close the discharge port 15, and opens and closes the discharge port 12 by means of a baffle plate 18. 1
9 is a heat insulating cover for the damper 17. Further, 20 is an electric compressor installed at the bottom of the refrigerator-freezer 1 and included in the refrigeration cycle.

FIG. 2 shows the electric circuit of the refrigerator-freezer 1. A thermostat 23 as a temperature control device for the freezer compartment 4, a parallel circuit of a blower motor 12M, and an electric compressor motor 20M are connected in series to the AC power supplies 22, 22. The motor 12M is further provided with a door switch 2 that opens when the door 6 or 7 is opened.
4 are connected in series. That is, when the door 6 or 7 is opened, only the blower 12 stops. The thermostat 23 is set to -16 depending on the temperature inside the freezer compartment 4, for example.
At -20°C, the contacts are closed and the motors 12M and 20M are energized to perform a cooling operation using the blower 12 and the electric compressor 20, and the contacts are opened at -20°C to stop the cooling operation. As a result, the temperature inside the freezer compartment 4 is set to -18°C on average.

Next, 25 is a temperature control circuit for the refrigerator 5, and a switch 26 is connected in parallel to the thermostat 23.
and controls the electromagnetic damper 17. FIG. 1 is a circuit diagram of the temperature control circuit 25. As shown in FIG. 30 is a general rectifier circuit that generates a constant DC voltage. 31 is a thermistor as a negative resistance element, and the refrigerator compartment 5
It is provided at the lower part of the damper cover 19 to sense the temperature of the damper cover 19. The terminal voltage of the thermistor 31 divided by the thermistor 31 and the resistor 32 is input to the - input terminal of the comparator 33, and the resistor 34 is input to the + input terminal.
The reference voltage set by and 35 is input. The comparator 33 has hysteresis due to the positive feedback resistor 36, and for example, the upper limit temperature of the refrigerator compartment 5
The output becomes a high potential (hereinafter referred to as " _H ") at 8°C, which is a high temperature T _E higher than T _H , and the output becomes a low potential (hereinafter referred to as "L") at 1°C, which is the lower limit temperature T L. becomes. A light emitting diode 38 as an indicator and the base of a transistor 39 are connected to the output of the comparator 33. The light emitting diode 38 is provided on the front surface of the door 7, and emits light when the output of the comparator 33 becomes "H". The transistor 39 becomes conductive when the output of the comparator 33 becomes "H", and the coil 26A of the switch 26 is energized. The switch 26 is the coil 26
A is energized and closed.

The terminal voltage of the thermistor 31 is further input to the − input terminal of the comparator 41, and the resistor 42 is input to the + input terminal.
The reference voltage set by and 43 is input. The comparator 41 has hysteresis due to the positive feedback resistor 44, and for example, the upper limit temperature of the refrigerator compartment 5
The output becomes "H" at 5℃, which is T _H , and the lower limit temperature
It becomes "L" at 1°C which is T _L. The base of a transistor 45 is connected to the output of the comparator 41, and the transistor 45 energizes the coil 17A of the electromagnetic damper 17 when the output of the comparator 41 becomes "H".
The damper 17 opens the discharge port 15 by the buff-full plate 18 when the coil 17A is energized, and closes when the damper 17 is not energized. That is, inside the refrigerator compartment 5, the electromagnetic damper 1 is normally used.
7, the temperature will be adjusted to an average of 3°C between 5°C and 1°C.

Here, when the inside of the freezer compartment 4 is sufficiently cold, the door 7 of the refrigerator compartment 5 is frequently opened and closed, or the refrigerator compartment 5
The temperature of the refrigerator compartment 5 rises due to a large heat load, such as storing food that has just been cooked, and the upper limit temperature
Even if T _H is reached and the damper 17 is opened, the thermostat 23 is open, so the electric compressor 20 and the blower 12 are not operated, and the refrigerator compartment 5 is not cooled.
Therefore, the temperature of the refrigerator compartment 5 continues to rise further, but when the temperature T _E reaches 8° C., the output of the comparator 33 becomes "H", so the transistor 39 becomes conductive and the coil 26A is energized, and the switch 26 is closed and the electric power is turned off. A compressor 20 and a blower 12 are forcedly operated regardless of a thermostat 23. At this time, since the damper 17 is open, cold air is introduced into the refrigerator compartment 5 for cooling, and further temperature rise is prevented. At this time, the light emitting diode 38 also lights up, which alerts the user that the temperature in the refrigerator compartment 5 has risen abnormally and forced operation of the electric compressor 20 and blower 12 has begun, and the user refrains from opening the door 7. Therefore, the cooling speed becomes faster. Thereby, quality deterioration of the articles in the refrigerator compartment 5 and overcooling of the freezing compartment 4 can be minimized. This forced operation continues until the temperature of the refrigerator compartment 5 reaches the lower limit temperature T _L of 1°C.
When the temperature reaches 1°C, the outputs of comparators 41 and 33 become "L".
Then, the damper 17 is closed, the switch 26 is opened, the light emitting diode 38 is turned off, and the forced cooling operation of the refrigerator compartment 5 is completed.

In addition, in the example, the forced operation based on the temperature of the refrigerator compartment 5 was terminated at the lower limit temperature T _L , but the present invention is not limited to this.
For example, the process may be terminated at a temperature between the upper limit temperature T _H and the lower limit temperature T _L. In that case, the supercooling of the freezer compartment 4 will be further reduced.

Further, in the embodiment, the first chamber is a freezing chamber and the second chamber is a refrigerator chamber, but the present invention is not limited thereto. There is no problem, and other temperature ranges may also be used.

(g) Effects of the invention As detailed above, according to the invention, when the first chamber is sufficiently cold, and sudden changes in the load in the second chamber or the opening/closing of the door, etc. Even if the load increases in the second chamber and the second chamber is under cooling, if the temperature in the second chamber exceeds a predetermined high temperature that is higher than the upper limit temperature, the electric compressor will be forced to operate regardless of the temperature in the first chamber. Therefore, in addition to supplying cold air by the damper device, the refrigeration cycle can be operated independently of the control status of the temperature control device, and colder air can be introduced to the second chamber, reducing the upper limit temperature in the second chamber. Temperature rises exceeding

Additionally, during the forced cooling operation, the display lights up to warn the user of an abnormal temperature rise in the second chamber, prompting the user to refrain from opening and closing the door, and speeding up the cooling speed of the second chamber. , it becomes possible to minimize the abnormal temperature rise in the second chamber and the temperature influence on the first chamber.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention; FIG. 1 is a temperature control circuit diagram of a refrigerator, FIG. 2 is an electric circuit diagram of a refrigerator-freezer, and FIG. 3 is a side sectional view of the refrigerator-freezer. 4... Freezer room, 5... Refrigerator room, 10... Cooler, 12... Air blower, 15... Discharge port, 17...
Electromagnetic damper, 20... Electric compressor, 23... Thermostat, 25... Temperature control circuit, 26...
Switch, 38...Light emitting diode, T _H ...Upper temperature limit, T _L ...Lower limit temperature, T _E ...High temperature.

Claims (1)

[Scope of utility model registration request] In a device that has a first chamber and a second chamber and uses a blower to supply cold air to both chambers for cooling, the operation of the electric compressor included in the refrigeration cycle is controlled based on the temperature of the first chamber. a temperature control device for controlling the temperature control device;
a damper device that starts supplying cold air to the second chamber at a predetermined upper limit temperature or higher based on the room temperature, and stops supplying cold air to the second chamber at a predetermined lower limit temperature or lower;
A refrigerator comprising: a device for forcing the electric compressor to operate at a predetermined high temperature or higher where the second room temperature is higher than an upper limit temperature regardless of the first room temperature and lighting a display device.