JPS6370059A - Refrigerator - Google Patents

Abstract

(57) [Abstract] 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 relates to a refrigerator, and particularly to a refrigerator suitable for controlling the internal temperature after returning from a rapid cooling operation and after returning from a defrosting operation.

[Conventional technology]

In a conventional refrigerator equipped with a device that rapidly cools the freezer compartment and the refrigerator compartment, for example, as described in Japanese Patent Application Laid-Open No. 55-43303, when a quick cooling start switch provided outside the refrigerator is pressed, the freezer compartment cools down. The set temperature can be lowered without turning the temperature adjustment dial of the refrigerator compartment, and the quenching time can also be changed arbitrarily, and when the drinking water, food, etc. that you want to cool is properly cooled, or when a certain period of time has passed. Then,
A device that automatically returns to a normal operating state is known.

Furthermore, according to the description in Japanese Utility Model Publication No. 61-1328, during quenching, defrosting is started after waiting for the end of quenching, and during defrosting, quenching operation is performed after waiting for the end of quenching, and after quenching is finished, quenching is automatically performed. A temperature control device for a refrigerator is disclosed that returns to automatic operation using a preset temperature before operation.
- [Problems to be Solved by the Invention] In the conventional refrigerator described above, in which cold air is supplied from the cooler to the freezer compartment and the refrigerator compartment using a fan, etc., when the freezing compartment is operated rapidly, the rapid cooling operation stops. When returning to normal operation (hereinafter simply referred to as rapid cooling return), the temperature of the freezer compartment is in a sufficiently cooled state and is lower than the set temperature.

Therefore, when returning to rapid cooling, the compressor and fan will stop.
If the freezer compartment temperature does not rise to the compressor on temperature, the compressor
The fan does not operate, and this stop time is longer than the stop time during normal operation (even longer if the ambient temperature of the refrigerator is low). No consideration was given to the possibility that the

Further, during normal operation, when the defrosting operation is started, the temperature of the cooler increases, the temperature of the freezer compartment also increases, and the temperature of the food in the refrigerator also increases. When the defrosting operation is finished and the cooling operation starts, the temperature mentioned above starts to drop, but if the compressor is turned on and off at the normal set temperature, the heat mass of the temperature sensor is smaller than the heat mass of the food, so large-capacity foods, etc. No consideration was given to the possibility that the compressor would shut off without sufficient cooling.

The present invention has been made in order to solve the problems of the prior art mentioned above, and it is possible to guarantee the temperature of the freezer compartment and the refrigerator compartment when the rapid cooling temperature returns, that is, to prevent the temperature inside the refrigerator from rising, and to The purpose is to provide a refrigerator that can protect against temperature rises, that is, quickly return food in the refrigerator whose temperature has risen during defrosting operation to an appropriate temperature.

[Means for solving problems]

In order to achieve the above object, the configuration of the refrigerator according to the present invention is such that a first set temperature is set as the off temperature of the compressor, a second set temperature is set as the on temperature of the compressor, and an internal temperature detector is set. is provided, and according to the detection output signal, the first
The compressor operates intermittently to control the internal temperature within the temperature range between the preset temperature and the second preset temperature, and after continuous operation for a certain period of time by inputting the rapid cooling operation switch, the normal intermittent operation is resumed. In a refrigerator equipped with a control circuit so as to return to operation, a third set temperature lower than the second set temperature is set, and the compressor is turned on only for one intermittent period of turning on and off the compressor after the end of the rapid cooling operation. The control circuit is configured to perform control at the third set temperature and thereafter perform normal intermittent operation within the temperature range of the first set temperature and the second set temperature.

It should be noted that a fourth set temperature lower than the first set temperature is set, and the compressor is controlled to be turned off at the fourth set temperature only during the period when the compressor is turned on and off after the defrosting operation is completed. The control circuit is configured to perform normal intermittent operation in the temperature range between the first set temperature and the second set temperature.

[Effect]

The following describes how the above technical means work.

When returning to rapid cooling operation, the compressor is stopped for a long time because the freezer compartment is supercooled during rapid cooling operation, and it takes time to return to the normal set temperature (compressor on temperature).
During this time, the fan is also stopped, and the only cooling in the refrigerator compartment is through heat conduction from the freezer compartment, causing the temperature in the refrigerator compartment to rise. It can be shortened and can supply cold air to the refrigerator compartment.

Furthermore, when the defrosting operation is resumed, by further lowering the set temperature at which the compressor is turned off, the food in the refrigerator, which has risen during the defrosting operation, can be quickly returned to an appropriate cooling temperature.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 5.

Here, FIG. 1 is a temperature control circuit diagram of a refrigerator according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the output signal from the temperature detector of FIG. 1 and temperature, and FIG. The figure is a temperature diagram of the freezer compartment temperature during normal intermittent operation, Figure 4 is the temperature diagram of the freezer compartment temperature when returning to rapid cooling operation, and Figure 5 is the temperature diagram of the freezer compartment temperature when returning to defrosting operation. It is a line diagram.

In FIG. 1, 1 is an amplifier, 2 is a resistor, and 3 is a temperature detector installed in the freezer compartment. 4.5.6.7 are resistors, and each set temperature described below is set by these resistors. Reference numeral 8 indicates a temperature detection circuit for defrosting recovery, which is comprised of a temperature detector installed in the cooler, etc.; 9 indicates a temperature detection circuit for defrost recovery, which processes the output signal from amplifier 1, controls the compressor, counts the time of rapid cooling operation, and This is a microcomputer that controls the operation of the cage. 10 is a switch for turning on/off the rapid cooling operation. 11 and 12 are buffer circuits; 13 is an AC control element that turns on and off the frost and reheater; 14
15 is an AC control element that turns on and off the compressor; 16 is a compressor; and 17 is an AC power source.

The output of the amplifier 1 is input to a microcomputer 9 (hereinafter referred to as microcomputer), and the negative input terminal of the amplifier 1 is connected to the midpoint between the resistor 2 and the temperature detector 3.

Further, the positive input terminal of the amplifier 1 is connected to the midpoint of the resistor 4.5, and further connected to the output of the microcomputer 9 via the resistor 6.7.

One end of the resistor 2 is connected to one end of the resistor 4, and is also connected to the power supply terminal (VOC) of the microcomputer 9. Also,
One end of the temperature detector 3 is connected to one end of the resistor 5, and
It is connected to the power terminal (GND) of the microcomputer 9. The output of the temperature detection circuit is connected to the input of the microcomputer 9.

The rapid cooling operation important switch 10 is connected to the input terminal of the microcomputer 9 and the power terminal (GND).

The input of the buffer circuit 11 is connected to the output of the microcomputer 9, and the output of the buffer circuit 11 is connected to the gate terminal of the AC control element 15. Further, the input of the buffer circuit 120 is connected to the output of the microcomputer 9, and the output of the buffer circuit 12 is connected to the gate terminal of the AC control element 13. One end of the AC power source 17 is connected to the AC power source 1 via the compressor 16 and the AC control element 15.
7 and is connected to the defrost heater 14 and back via the AC control element 13 .

Next, the operation of temperature control in a refrigerator having a control circuit having such a configuration will be explained. In Fig. 2 used for the following explanation, the horizontal axis is the freezing room temperature (T°C), and the vertical axis is the output of amplifier 1 (v).
shows the level change of the output signal. In addition, in each of FIGS. 4 and 5 used in the following explanation, time t is plotted on the horizontal axis, and freezer compartment temperature T° C. is plotted on the vertical axis, and changes in the freezer compartment temperature are shown by solid lines. The one-dot chain line indicates the level of the set temperature.

During the normal intermittent operation shown in FIG. 9, when the temperature of the freezer compartment is high, the output of the amplifier 1 becomes "H" level, the "H" level is input from the microcomputer 9 to the input of the buffer circuit 11, and the AC control element 15 is turned on. Then, the compressor 16 becomes operational.

Since the compressor 16 is operating, the freezer compartment is cooled, and the freezer compartment temperature detected by the temperature sensor 3 is low (then the voltage at the negative input terminal of the amplifier 1 gradually increases, and the voltage at the positive input terminal determined by the resistor 4.5) increases. When the voltage becomes higher than the terminal voltage, the output of the amplifier 1 changes from the "14" level to the "L" level, the AC control element 15 turns off, and the compressor 16 stops at the first set temperature B shown in FIG.

At the same time, the output of the microcomputer 9 to which one end of the resistor 6 is connected is set to "L" level, which is normally floating. ), and the positive input terminal voltage of amplifier 1 is
．． 6 is connected in parallel, so it decreases.

Therefore, since the compressor 16 is stopped, when the freezer compartment temperature rises, the negative input terminal voltage of the amplifier 1 gradually decreases, and when it becomes lower than the positive input terminal voltage determined by the resistor 4.5.6, the voltage of the amplifier 1 increases again. When the output becomes "H" level (see solid line arrow at point B in Figure 2), the input of the buffer circuit 11 becomes "H" level.
When the AC control element 15 goes from L'' level to H level, the AC control element 15 turns on, and the compressor 16 becomes operational at the second set temperature F shown in FIG. Since the output of is in a floating state from the "L level", the positive input terminal voltage of amplifier 1 is connected to the resistor 4.5.
It is determined by , and it rises again. Thereafter, this process is repeated to control the inside temperature to a constant temperature.

When the rapid cooling operation important switch 10 is pressed during such normal intermittent operation, the microcomputer 9 inputs the °H'' level to the input of the buffer circuit 11, forcing the compressor 16 to operate continuously, and the fourth The rapid cooling operation state shown in is reached.

The quenching operation time is counted by a counter of the microcomputer 9 for a certain period of time, and the normal intermittent operation is automatically resumed. At the time of returning to the rapid cooling operation, the temperature of the freezer compartment is sufficiently low so that the output of the amplifier 1 is at the "L" level and the compressor 16 is stopped. At the same time, the output of the microcomputer 9 to which one end of the resistor 7 is connected is “I”
” level (normally floating), and the positive input terminal of amplifier 1 is connected with resistor 4.7 in parallel and resistor 5.6 in parallel, and the value of resistor 7 is set small, so the terminal voltage is equal to the normal compression voltage. Therefore, when the negative input terminal voltage of the amplifier 1 decreases, the output of the amplifier 1 goes from the "L" level to the "1" level (second level) earlier than when the amplifier 1 is stopped. (See dotted line arrow in figure C)
, the input voltage of the buffer circuit 11 goes from “L” level to “H”
The compressor 16 starts operating at the third set temperature J shown in FIG. 4. At the same time, each output of the microcomputer 9 to which one end of the resistor 6.7 is connected becomes floating from the "L" level, and the positive input terminal voltage of the amplifier 1 becomes equal to the normal first set temperature E determined by the resistor 4.5. Become.

In this way, the temperature at which the compressor 16 is turned on only for one intermittent period of compressor on/off when returning to rapid cooling operation is set at the third set temperature J, which is lower than the normal second set temperature F, and thereafter Normal intermittent operation is performed in a temperature range between the set temperature E and the second set temperature F.

If intermittent operation continues, frost will form on the two cooling wings. Therefore, defrosting operation is performed under control such as by integrating the on-time of the compressor.

When the output signal for defrosting operation is output from the microcomputer 9 during intermittent operation, the input of the buffer circuit 12 becomes "H" level, and the input of the buffer circuit 11 becomes °L" level, causing the compressor 16
stops, the defrosting heater 14 is energized, and defrosting operation begins as shown in FIG. Return from defrosting operation to normal intermittent operation (hereinafter referred to as defrosting operation return) is performed by a signal from defrosting return temperature detection circuit 8. Temperature detector 8
When the return signal is inputted, the microcomputer 9 changes the input of the buffer circuit 12 from the "H#" level to the "L" level, the defrosting heater 14 is turned off, and the defrosting operation is completed.

After that, the output from the microcomputer 9 causes the buffer circuit 11 to
The input becomes "14" level, the compressor 16 starts operating, and starts cooling operation. At the same time, the output of the microcomputer 9 to which one end of the resistor 7 is connected becomes "L" level, and the positive input terminal voltage of the amplifier 1 is connected to the resistor 4.7 in parallel, and the resistor 5 is connected in series to it. Therefore, the potential becomes higher than the potential at the normal first set temperature.
Since the negative input terminal voltage of the amplifier 1 is in the cooling state, it gradually increases, and when it rises to the positive input terminal voltage determined by the resistor 4.5.7, the output of the amplifier 1 changes from the "I" level to "L".
When the temperature reaches the fourth set temperature shown in FIG. 5, the compressor 16 is turned off. That is, the compressor 16 is controlled to be turned off at the fourth set temperature only during one intermittent turn on and off of the compressor after the end of the defrosting operation, and thereafter it is controlled within the temperature range between the first set temperature E and the second set temperature F. Normal intermittent operation is performed.

As described above, according to the present embodiment, upon recovery after rapid cooling operation is performed, the third set temperature J lower than the second set temperature F (compressor ON temperature) is provided to control the compressor 16. By doing so, the compressor 16 can be prevented from being stopped for a long time, and the temperature inside the refrigerator can be prevented from rising.

In addition, after the defrosting operation, a fourth set temperature K lower than the first set temperature E (compressor off temperature) is provided and the compressor 16 is controlled to remove the food in the refrigerator whose temperature has risen during the defrosting operation. It can quickly return to the appropriate temperature.

〔Effect of the invention〕

As described above, according to the present invention, the temperatures of the freezer and refrigerator compartments are guaranteed when the rapid cooling temperature returns, that is, the temperature inside the refrigerator is prevented from rising, and after the defrosting operation is resumed.

It is possible to provide a refrigerator that can protect against an increase in temperature inside the refrigerator, that is, can quickly return food inside the refrigerator whose temperature has risen during defrosting operation to an appropriate cool temperature.

[Brief explanation of the drawing]

FIG. 1 is a temperature control circuit diagram of a refrigerator according to an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the output signal from the temperature detector of FIG. 1 and temperature, and FIG. , Figure 4 is a temperature diagram of the freezer compartment temperature during normal intermittent operation, Figure 4 is a temperature diagram of the freezer compartment temperature when returning to rapid cooling operation, and Figure 5 is a temperature diagram of the freezer compartment temperature when returning to defrosting operation. It is. 3... Temperature detector, 8... Temperature detection circuit for defrosting recovery, 9... Microcomputer, 10... Rapid cooling operation important switch, 16... Compressor, B... First setting temperature, F
...Second set temperature, J...Third set temperature, K.
...Fourth set temperature. 7, -7・

Claims (1)

[Claims] 1. A first set temperature is set as the off-temperature of the compressor, a second set temperature is set as the on-temperature of the compressor, and an internal temperature detector is provided, and according to the detected output signal. , 1st
The compressor operates intermittently to control the internal temperature within the temperature range between the preset temperature and the second preset temperature, and after continuous operation for a certain period of time by inputting the rapid operation switch, the compressor resumes normal intermittent operation. In a refrigerator equipped with a control circuit so as to return to operation, a third set temperature lower than the second set temperature is set, and the compressor is only turned on and off once after the end of the rapid cooling operation. The refrigerator is characterized in that the control circuit is configured to control the temperature at the third set temperature, and thereafter perform normal intermittent operation in the temperature range between the first set temperature and the second set temperature. 2. In the device described in claim 1, a fourth set temperature lower than the first set temperature is set, and the compressor is turned off only during one intermittent turn on and off of the compressor after the end of the defrosting operation. A refrigerator in which a control circuit is configured to control the temperature at a set temperature, and thereafter perform normal intermittent operation within a temperature range from the first set temperature.