JPS5878080A - 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 The present invention relates to a refrigerator equipped with a device that warns of an abnormal temperature inside the refrigerator.

Conventionally, this type of refrigerator has been devised with a device that immediately warns with a lamp or a sounding body when the temperature inside the refrigerator exceeds a preset temperature range. Although the original purpose of this device is to warn the user of the There is a flaw in that a warning is issued even when there is no abnormality in the refrigerator, such as when the temperature rises over time or when the refrigerator is installed and starts operating until the inside of the refrigerator is cooled down. It gave me a feeling. In addition, it is possible to install a "human""off" switch for the warning device in case something like this does not occur, but it is cumbersome to operate, and people forget to turn it on or turn it off, so it ends up being useless. It had the flaw of becoming a thing.

The present invention has been made in order to eliminate the above-mentioned defects, and aims to provide a refrigerator equipped with a device that does not give a sense of distrust to the user and displays a warning only when the refrigerator is in an abnormal operating state. be.

The details of the present invention will be explained below with reference to an embodiment shown in FIG. Reference numeral 1 denotes a temperature detector such as a thermistor, which is installed to detect the temperature inside the refrigerating chamber of the refrigerator. 2 indicates a power supply that provides a reference voltage. 3 is a comparator. The output voltage of the comparator 3 is determined by the refrigerator temperature detector 1 and the reference voltage 2 to indicate that when the temperature of the refrigerator compartment is within a certain set temperature range (for example, 0 to +10°C), the output voltage is at the 1° level, which indicates that it is outside the set temperature range. It is set so that it is at the 0" level.

Reference numeral 4 designates a two-timer circuit, which generates a "1" level signal from the output terminal 43 after a certain period of time (for example, 30 minutes) has elapsed since the signal from the reset terminal 42 disappeared. 5 is an R-S flip-flop. The output terminal of comparator 3 is.

It is connected to the reset terminal 42 of the timer circuit 4 and the reset terminal 51 of the R-S flip-flop 5, and the output terminal 43 of the timer circuit 4 is connected to the set terminal 52 of the R-S flip-flop 5. R-S flip-flop 5
The output terminal 53 of is connected to the inhibition gate 12. 9
are clock generation circuits, which are respectively connected to clock input terminals 41 and 41' of the timer circuits 4 and 4'. 1
o is a decoder driver, and the signal at the input terminal 101 is "1".
11 is a digital display element such as a light emitting diode, which displays a numerical value according to the numerical signal from the decoder driver 10. When a "1" level signal is input to the input signal 122 of the inhibit gate, the output 123 becomes "0" level regardless of the level of the signal at the other input terminal 121.

13 is a timer circuit that outputs a "1" level signal for a certain period of time after the refrigerator is turned on, and then outputs an O signal after a certain period of time has elapsed.
``I want it to be on the same level.

Next, to explain the operation shown in Figure 1, the refrigerator is operating normally and the temperature inside is normal.
Since the output is set to be at the 11" level, a signal of 1 level is applied to the reset terminal 42 of the timer circuit 4 and the reset terminal 51 of the R-S flip-flop 5. Element 7 is off. For example, if the refrigerator temperature exceeds a preset temperature range (for example, 10°C or higher), the output of the comparator 3 becomes 0'' level, and the reset terminal 42 of the timer circuit 4
The signal disappears, and the timer circuit 4 starts timer operation. At this time, the input signal to the reset terminal 51 of the R-S flip 70 tube 5 also disappears, but since no signal is input to the set terminal 52, the output terminal 53 remains at the "0" level.

The display element 7 remains off. The temperature inside the refrigerator is
When the temperature returns to normal within the time set by the timer circuit 4 (for example, 30 minutes), the output signal of the comparator 3 becomes "1" level again, so the display element 11 remains off. When the time during which the temperature in the refrigerator compartment is outside the set temperature range exceeds the set time of the timer circuit 4, the output terminal 43 of the timer circuit 4 goes to the "1" level, and therefore an R-S flip occurs.

The output 53 of the 70 tube 5 also becomes the "L" level, and the display element 11 lights up to issue a warning. This warning display continues until the temperature of the refrigerator compartment becomes normal and the output of the comparator 3 reaches the "L" level. A similar operation can be performed regarding the temperature of the freezer compartment. On the other hand, if the setting time of the timer circuit 13 is set to the time from the start of operation of the refrigerator until the temperature inside the refrigerator reaches normal temperature, it is possible to When restarting operation after turning on the refrigerator, if the temperature inside the refrigerator is higher than the set temperature range even though the refrigerator is normal, the abnormal temperature alarm will not be issued and the timer circuit 4 will not issue after the set time of the timer 13 has elapsed. Operate at. Furthermore, since the display device is a digital display, it is possible to know that the temperature inside the refrigerator has exceeded the limit value, and also to know what the limit temperature is (for example, 10° C.).

As described above, since the present invention combines a temperature detection circuit and a timer, when a load is applied near the temperature detector,
Even though the refrigerator is operating normally, such as when defrosting, it will not issue an abnormal temperature warning if the temperature exceeds the set temperature for a short period of time, and will only issue a warning if it is in a truly abnormal state. When installing the refrigerator or after stopping the operation of the refrigerator for a long time, when turning on the power and restarting operation, a warning is issued only when there is a truly abnormal condition, so there is no need to give the user a sense of distrust. The effect is great because there is no need to worry about turning the switch off. In the above embodiments, the case where the display unit is a display element such as a light emitting diode has been explained, but it is of course possible to replace it with an alarm using a sounding body such as a buzzer, or to use both together. It is. Furthermore, it is a matter of course that the present invention also includes things that can be realized by a program using a microcomputer or the like instead of the circuit shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of circuits illustrating different embodiments of the present invention. l, 1'...Temperature detector, 3.3'...Comparator. 4.4'...Timer circuit, 5.5'...R-S flip-flop, 6.6'...Inverter, 7.7
'... Display element, 10... Decoder driver, 11
...Digital display, 12...Prohibition gate, 13
...Timer circuit, AlB, X...Input terminal. Representative Patent Attorney Susuki 1) Li -6@.

Claims (1)

[Claims] ], at least one temperature detector (1) or (1') for checking the internal temperature of the refrigerator, and a warning device for issuing a warning by a signal from the temperature detector (1) or (1') (7)
or (11), and when the temperature inside the refrigerator reaches an abnormal temperature exceeding the set temperature range, the above-mentioned warning device (7)
Or, in a refrigerator where (11) issues a warning, the above-mentioned warning device (7) or (11) issues a warning when the internal temperature exceeds a set temperature range for a predetermined time. A refrigerator characterized in that a warning is not issued until a predetermined time has elapsed after the refrigerator is turned on.