JPS6358077A - 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 [Object of the Invention] (Industrial Field of Application) The present invention relates to a refrigerator capable of performing quick freezing operation and defrosting operation.

(Prior art) The quick freezing operation in this type of refrigerator is performed to freeze the food stored in the freezer compartment as quickly as possible. For example, by turning on the quick freezing operation switch, a timer device is activated and the compressor is activated. The refrigerator is operated continuously for a predetermined period of time to forcibly perform cooling by the cooler regardless of the temperature control of the freezer compartment. On the other hand, the defrosting of the cooler is
When the compressor operation time has been accumulated up to the specified time, it is confirmed that H? ``LL will now start automatically,
When a defrost start command is output from the operation time integration circuit, the compressor operation is stopped and the defrost heater is energized, and when the frost melts and the temperature of the cooler rises to the predetermined temperature, the defrost heater is turned on. The power is cut off. Also, if a command to start defrosting is received while rapid freezing operation is in progress,
Conventionally, the compressor was simply stopped when the set time for rapid freezing operation expired, and the defrosting heater was turned on. I try to use electricity.

(Problems to be Solved by the Invention) However, in the +M configuration described above, since a defrosting operation may be performed following the quick freezing operation, if the time to take out the food is delayed after the quick freezing operation is completed, When food is frozen to a low temperature by the quick freezing operation, the temperature rises due to the defrosting operation that is started immediately after the quick freezing operation ends, and there is a risk that the food may lose its freshness or deteriorate in quality.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a refrigerator in which there is no risk that food cooled by rapid freezing operation will lose its freshness or deteriorate in quality.

[Structure of the Invention] (Means for Solving Problems) The present invention provides a device capable of performing a quick freezing operation by forced operation of a compressor and a defrosting operation by heating a cooler with a heater. When the quick freezing operation is executed, execution of the defrosting operation is prohibited until a predetermined period of time has elapsed from the end of the quick freezing operation.

(Function) When the quick freezing operation is executed and completed, the defrosting operation will not be performed for a predetermined period of time from the end point, and if the predetermined period of time has elapsed, the defrosting operation will be performed as required by the defrosting start command. Driving begins.

Therefore, when food is rapidly frozen by rapid freezing operation, even if defrosting operation is started afterwards, there is still 1,+7 hours, which is enough to remove the food from the freezer compartment.
Therefore, the food is not immediately affected by the defrosting operation.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

1 is a compressor drive circuit, which includes a compressor relay coil 2 and an N P N type transistor 3.
etc. Reference numeral 4 denotes a defrosting heater drive circuit, which includes a defrosting heater energization/disconnection relay coil 5, an NPN type transistor 6, and the like. Note that the defrosting heater is attached to a cooler that cools the freezer compartment. Reference numeral 7 denotes a freezing chamber 1: H degree detection circuit, which includes a temperature sensor 8 and a comparator 9 having a Schmitt trigger function. When the temperature exceeds i degrees, a high-level compressor drive command signal is output, and when the temperature falls below the lower limit set temperature, a low-level compressor stop command signal is output. Reference numeral 10 denotes a defrosting completion determination circuit, which includes a temperature sensor 11, a comparator 12, etc., and the temperature sensor 11 detects the defrosting temperature of the cooler. This defrosting end determination circuit 10 outputs a low level defrosting end signal when the defrosting temperature in the cooler reaches a temperature at which defrosting ends. 13 is an integration timer, which is
The clock pulses applied to the clock terminal CK are counted to accumulate the operating time of the compressor, and when the accumulated time reaches a predetermined time, the output terminal Q is changed to high level, and the reset terminal trap is changed to low level. It will then be reset. 14 is a set input circuit having a quick freezing set switch 15, and 16 is a reset input circuit having a quick freezing reset switch.

Reference numeral 18 denotes a JK flip-flop circuit, whose input terminal J is connected to the set input circuit 14, and whose input terminal -J'- is connected to the reset input circuit 16. Reference numeral 19 denotes a quick freezing timer, which counts clock pulses applied to its clock terminal CK and changes its output terminal Q to a high level when the quick freezing operation is executed for a predetermined period of time, for example, 9θ minutes. 20 is a D flip-flop circuit, 21 is a delay timer, and this delay timer 21
counts the clock pulses received at its clock terminal CK +: , 'j, and changes its output terminal Q to a high level when a predetermined period of time, for example, 10 minutes has elapsed. Thus, the above-mentioned compressor drive circuit 1.defrosting heater drive circuit 4. Freezer room temperature detection circuit 7゜Defrost completion judgment circuit 1
0. Integration timer 13. JK flip-flop circuit 1g,
Timer 19. D flip-flop circuit 20. As shown in the figure, the delay timer 21 is connected through each logic element, a diode, and the like.

Now, the operation of the above configuration will be described. First, normal freezing operation and refrigeration operation will be described. In this case, the integration timer 13 has not reached its predetermined time, and its output terminal Q is at a low level, and the first input terminal of the three-hand type AND circuit 22 connected to this output terminal "7'Q" is low level, therefore its output is low level, and AND circuit 2
The output of No. 3 is also at a low level, so the transistor 6 of the defrosting heater drive circuit 4 is turned off, and as a result, the defrosting heater is cut off. Further, the freezing room temperature detection circuit 7 timely outputs a compressor drive command signal (high level) or a compressor stop command signal (low level) according to the temperature of the freezing room, and each of these signals is sent to the OR circuit 24 and the diode 25. is applied to the base of transistor 3 of compressor drive circuit 1 via. Therefore, the compressor is energized or disconnected by the compressor drive command signal and compressor stop command signal from the freezing room temperature control circuit 7.

At this time, each signal from this freezer compartment temperature detection circuit 7 is 3.
It is also applied to the first input terminal of the human-powered AND circuit 26. A signal from the output terminal Q (low level in this case) of the flip-flop circuit 18 is inverted (made high level) and applied to the second input terminal of the AND circuit 26, and the third A clock pulse is given to the input terminal of. Therefore, this AND circuit 2
6 outputs a clock pulse and applies it to the clock terminal CK of the integration timer 13 during the time when the compressor drive command signal is manually input, that is, when the compressor is normally operated. The integration timer 13 counts these clock pulses and integrates the compressor operating time.

When the cumulative time in the cumulative timer 13 reaches a predetermined time, a high level signal is output from the output terminal Q and applied to the first input terminal of the AND circuit 22. At this time, the second input terminal of the AND circuit 22 receives a signal (high level) inverted by the NOT circuit 28.
is given to the third input terminal, and the defrosting completion determination circuit 1 is supplied to the third input terminal.
0 (high level) is applied, therefore, the output of this AND circuit 22 is high level, and this high level signal is applied to one input terminal of the AND circuit 23. Since the output terminal Q of the flip-flop circuit 20 is at a low level in this case, the other input terminal of the AND circuit 23 is at a high level which is inverted by the NOT circuit 29, and therefore the output of this AND circuit 23 is also at a high level. Therefore, the transistor 6 of the defrosting heater drive circuit 4 is turned on, and the defrosting heater is energized.

In this case, since a diode 29 is connected between the collector of this transistor 6 and the base of the transistor 3 of the compressor drive circuit 1 with the polarity shown,
The transistor 3 is turned off and the compressor is de-energized regardless of the temperature of the freezer compartment. In this way, the defrosting operation is started. As this defrosting operation progresses, the defrosting temperature in the cooler increases by 1, and when it reaches the defrosting end temperature, a low level defrosting end signal is output from the defrosting determination circuit 10,
As a result, the transistor 6 of the defrosting heater drive circuit 4 is turned off and the defrosting heater is de-energized, and the compressor is now de-energized by the signal from the freezer compartment temperature detection circuit 7. Defrosting operation is ended. Furthermore, since this defrosting end signal is given to the reset terminal trap of the integration timer 13, the integration timer 13 is reset and starts counting based on the clock pulse at the time when the compressor drive command signal is output.

Next, when performing a quick freezing operation, the quick freezing set switch 15 is turned on. As a result, the input terminal J of the flip-flop circuit changes to high level, and the output terminal Q thereof changes to high level. As a result, the AND circuit 26
The signal applied to the second input terminal of the AND circuit 27 via the NOT circuit 27 changes to a low level, the output of the clock pulse from the AND circuit 26 is stopped, and the l-counting timer 13 stops counting. do. Therefore, while the output terminal Q of the flip-flop circuit 18 is at a high level, that is, during the time when the quick freezing operation is being performed, the output terminal Q of the integration timer 13 does not become a high level, and therefore the defrosting operation is not performed. Not done. Also, flip-flop circuit 1
The high level signal from the output terminal Q of 8 is given to the other input terminal of the OR circuit 24, and the OR circuit 24 makes its output at high level at that time. The system is forced to operate regardless of the signal received, and forced refrigeration operation is started.

Furthermore, the high-level signal from the output terminal Q of the flip-flop circuit 18 is also given to the clock terminal CK of the flip-flop circuit 20, but this flip-flop circuit 20 performs a set operation when the clock terminal CK changes to low level. , at this point, its output terminal Q remains at a low level, and therefore the reset terminal -rr< of the delay timer 21 also remains at a low level, and the delay timer 21 is not performing a counting operation. . Then, as the quick freezing operation progresses, the timer 19 starts running for a predetermined time (
In this case, 90 minutes), at that point, or when the quick freezing reset switch 17 is turned on,
The output terminal Q is changed to high level, and the high level signal is applied to the input terminal K of the flip-flop circuit 18. As a result, the flip-flop circuit 18 changes its output terminal Q to a low level. With this, OR circuit 2
Since the other input terminal of 4 becomes low level, the compressor returns to the normal operation where the power is turned on and off by the signal from the freezer compartment temperature detection circuit 7, and the second input terminal of the AND circuit 26
Since the input terminal becomes high level, the integration timer 13 starts counting +Jj clock pulses during the time when the compressor drive command signal is output. Further, as the output terminal Q of the flip-flop circuit 18 changes to a low level, the clock terminal CK of the flip-flop circuit 20 changes to a low level, and thereby the output terminal Q changes to a high level. This high level signal is applied to the reset terminal k of the delay timer 21 and also applied to the other input terminal of the AND circuit 23 via the NOT circuit 29. As a result, the delay timer 21 starts counting the clock pulses applied to its clock terminal CK, and the AND circuit 23 outputs its output regardless of the signal applied to one input (the signal from the AND circuit 22). is the low level. and delay timer 2
1 changes its output terminal Q to a high level after a predetermined time (10 minutes in this case), and the flip-flop circuit 20 changes its output terminal Q to a low level at the reset terminal. , the delay timer 21 is reset, and the other input terminal of the AND circuit 23 is set to a high level via the NOT circuit 29. Therefore, even if the product or the output terminal Q of the timer 13 becomes high level before the predetermined time set by the delay timer 21 has elapsed after the rapid freezing operation, the defrosting heater will not be energized, and the defrost heater will not be energized, and when the predetermined time has elapsed, the defrosting heater will not be energized. The defrosting heater is energized and defrosting operation is started.

In this way, during the period from when the output terminal Q of the flip-flop circuit 18 changes to low level and the rapid freezing operation ends until the predetermined time set by the delay timer 21 elapses, the other input terminal of the AND circuit 23 is set to low level. Hold the state and forcibly turn off the defrost heater to perform defrost operation! Therefore, even if the output terminal Q of the integration timer 13 changes to a high level immediately after the quick freezing operation is executed and ended, that is, even if there is a command to start defrosting, the defrosting operation will be stopped. Since the execution of the defrosting operation is prohibited, the defrosting operation is not performed, and therefore, the quick-frozen food is not immediately affected by the thermal effects of the defrosting operation.
The sip will not lose its freshness or deteriorate in quality. Since there is a predetermined time period from the end of the quick freezing operation to the start of the defrosting operation, there is sufficient time to take out the quick frozen food from the freezer compartment.

[Effects of the Invention] As is clear from the above description, the present invention is capable of performing a rapid freezing operation by forced operation of a compressor and a defrosting operation in which a cooler is heated by a heater. When the freezing operation is executed, the defrosting operation is prohibited until a predetermined time has elapsed from the end of the quick freezing operation, so that the defrosting start command is issued immediately after the quick freezing operation ends. Even in some cases,
Defrosting operation is not started, and therefore the quickly frozen food does not lose its freshness or deteriorate in quality, which is an excellent effect.

[Brief explanation of the drawing]

The drawing is an electrical circuit diagram showing an embodiment of the present invention. In the figure, 1 is a compressor drive circuit, 4 is a defrost heater drive circuit, 7 is a freezer compartment lH degree detection circuit, 10 is a defrost end judgment circuit, 13 is an integration timer, 19 is a timer for quick freezing,
21 is a delay timer.

Claims (1)

[Claims] 1. In a device capable of performing a quick freezing operation by forced operation of the compressor and a defrosting operation by heating the cooler with a heater, when the quick freezing operation is executed, from the time the quick freezing operation ends A refrigerator characterized in that the refrigerator is configured to prohibit execution of the defrosting operation until a predetermined period of time has elapsed.