JPH05312460A - Refrigerator - Google Patents

Abstract

PURPOSE:To prevent refrigerated foodstuffs from rotting by malfunction due to noise or the like in the defrosting control of a refrigerator, thereby causing a defrosting operation to continue for a long time. CONSTITUTION:The refrigerator comprises a defrosting temperature detecting means 11 for detecting temperatures of a cooler, a defrosting heater 10, a control means 19 comprising CPU 15, RAM 16, ROM 17, and a defrosting timer 20 for counting the time during which the defrosting heater 10 is energized, and a drive means 14 for driving the heater 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to operation control in a refrigerator.

[0002]

2. Description of the Related Art In recent years, models using a microcomputer have become the mainstream for operation control of refrigerators.

Conventionally, this kind of operation control is NR-D35A which was released by Matsushita Electric Industrial Co., Ltd. in April 1987.
The structure shown in a refrigerator is common. The configuration will be described below with reference to FIGS. 4 to 6.

Reference numeral 1 denotes a refrigerator body, which is a forced ventilation type refrigerator in which air cooled by a cooler 4 housed in a cooling chamber 3 formed in a partition wall 2 is circulated to a freezing chamber 6 and a refrigerating chamber 7 by a blower 5. Is. Reference numeral 8 is a freezing room temperature detecting means such as a thermistor for detecting the temperature of the freezing room 6, and outputs an operation signal for operating the compressor 9 of the refrigerator. Further, a defrosting heater 10 that melts frost attached by heat exchange is arranged in the cooler 4.
Reference numeral 11 is a thermistor that detects the temperature of the cooler 4 and determines that the temperature of the cooler 4 has risen to a predetermined temperature or more and frost has melted when the defrost heater 10 is energized and stops energizing the defrost heater 10. It is a defrosting temperature detecting means including the above.

Next, the control circuit will be described. Reference numeral 12 is a control means, and the temperature detection means 8 and the defrosting temperature detection means 11 are connected to the input terminals thereof. The output terminal has a driving means 13 for moving the compressor 9 and a defrost heater 1.
Drive means 14 for energizing 0 is connected.
The control means 12 is a microcomputer (CPU) 15
And a RAM 16, a ROM 17, and an operation timer 18 for accumulating the operating time of the compressor 9, and the like.
The ROM 17 stores a program for determining the next operation based on the order of confirmation of operations and the state at that time.

The operation of the above arrangement will be described with reference to FIG. When the power is turned on, RA is set as step 1
All data in M16 is cleared and initialization is performed. Next, in step 2, the input data from the temperature detecting means 8 is compared with preset temperature data. If it is determined in step 2 that the input temperature data is high, the process proceeds to step 3 to output from the control means 12 to turn on the compressor 9. Next, in step 4, the integration timer of the operation timer 18 is counted.

If it is determined in step 2 that the input temperature data is low, the control means 12 outputs the data to proceed to step 5 to turn off the compressor 9. In both step 5 and step 4, the process proceeds to step 6 to check the count state of the operation timer 18. Run timer 1 in step 6
If 5 has not finished counting, the process returns to step 2 and the above operation is repeated until the operation timer 18 finishes counting. That is, the drive means 13 operates or stops the compressor 9 based on the output of the control means 12 to maintain the temperatures of the freezing compartment 6 and the refrigerating compartment 7 appropriately.

Next, in step 6, when the operation timer 18 has finished counting for a predetermined time, the process proceeds to step 7. In step 7, the control means 12 outputs to turn off the compressor 9, and in step 8, the control means 12 outputs to turn on the defrost heater 10. Next, in step 9, the defrosting temperature detecting means 11 is checked and compared with preset temperature data. If the temperature is low, step 7
The defrosting heater 10 continues to be energized.

Further, in step 9, the defrosting temperature detecting means 11
If the temperature is high, go to step 10. Step 1
When it is 0, the defrosting heater 10 is turned off, and the control means 12 outputs it. After that, the process returns to step 2 to start the cooling action. That is, when the operation time of the compressor 9 is counted by the operation timer 18 for a predetermined time, the defrost heater 10 is energized to remove the frost on the cooler 4. And the defrosting temperature detecting means 1
When 1 becomes higher than a predetermined temperature, it is judged that defrosting has been performed, and the defrosting heater 10 is de-energized to start a normal cooling action.

[0010]

However, during such a cooling operation, when the data of the RAM 16 becomes abnormal due to noise or the like, the steps of the ROM 17 are broken, or the operation is completely different from the normal operation, For example, when it is determined in step 9 that the RAM 16 has collapsed and the temperature of the defrosting temperature detection means 11 is actually high but low, defrosting does not end and the next cooling operation is not performed. Therefore, there is a disadvantage that the food in the refrigerator is eventually put into a non-cooled state and is spoiled.

The present invention solves the above-mentioned problems, and an object of the present invention is to eliminate the adverse effect on the refrigerated food due to abnormal operation of the control circuit due to noise or the like.

[0012]

In order to solve the above-mentioned problems, the refrigerator according to the present invention, when the defrost heater is energized,
The defrosting timer is operated, and when the defrosting timer is integrated for a predetermined time or more, the defrosting timer is set to the initial state when the power is turned on.

[0013]

According to the present invention, with the above-described configuration, the compressor is integrated for a predetermined time and the defrost heater is energized, and at the same time, the counter is operated to measure the energization time of the defrost heater. Then, if the defrosting does not end even if the time reading of the counter reaches the set value, it is determined to be abnormal, and the initial state at power-on is set. Therefore, since the correct cooling operation is performed again, it is possible to prevent the food from being spoiled.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same components as those of the conventional one are designated by the same reference numerals, detailed description thereof will be omitted, and only different portions will be described.

In the figure, reference numeral 19 has an operation timer 18 for counting the operation time of the compressor 9 and a defrost timer 20 for counting the energization time of the defrost heater 10 by a control means such as a microcomputer.

The operation of this structure will be described with reference to FIG. In addition, from step 1 to step 6,
Since it is the same as the conventional example, it is omitted. When the operation timer 18 counts for a predetermined time in step 6, the process proceeds to step 10. In step 10, the compressor 9 is turned off, and in step 11, the defrost heater 10 is turned on. Next, in step 12, the temperature of the defrosting temperature detecting means 11 is checked. If the temperature is high, the process proceeds to step 13 to turn off the defrosting heater 10 and returns to step 2.

If the temperature of the defrosting temperature detecting means 11 is low in step 12, the process proceeds to step 14 and the count of the defrosting timer 20 is advanced. Next, in step 15, the counter value of the defrost timer 20 (that is, the energization time of the defrost heater 10) is read, and if it is longer than the set time, the process proceeds to step 16. If the time is shorter than the set time in step 15, the process returns to step 10. If it is longer than the set time in step 15, step 1
6, the defrost heater 10 is turned off and the process proceeds to step 17. In step 17, the defrost timer 20 is cleared and the process returns to step 1.

Therefore, during the cooling operation, R
When the data of AM16 becomes abnormal, the step of ROM17 collapses, or the operation is completely different from normal operation, for example, RAM16 collapses in step 11,
Even when it is determined that the temperature of the defrosting temperature detection means 11 is actually high but low, the defrosting timer 20 is counted in step 14, and the defrosting timer 20 is not counted up in step 15, the process proceeds to step 10. Return, Step 15
If it is counted up, the process proceeds to step 16, the defrost heater 10 is turned off, the defrost timer 20 is cleared at step 17, and the process returns to step 1 to return to the initial state when the power of the refrigerator is turned on. It can prevent the food in the refrigerator from spoiling.

[0019]

As described above, according to the refrigerator of the present invention, it is provided with the defrost timer which operates when the defrost heater is energized,
When the timer integrates for a predetermined period of time, the refrigerator is set to the initial state when the power is turned on.Therefore, in the case of a malfunction due to noise or the like, the defrosting operation continues for a long time without cooling operation and the food in the refrigerator is not cooled. The serious problem of rotting can be prevented, and its practical effect is great.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention.

FIG. 2 is a flow chart of the refrigerator according to the embodiment.

FIG. 3 is a sectional view of the refrigerator according to the embodiment.

FIG. 4 is a control circuit diagram of a refrigerator showing a conventional example.

FIG. 5 is a flowchart of a conventional refrigerator.

FIG. 6 is a sectional view of a conventional refrigerator.

[Explanation of symbols]

 1 Refrigerator 6 Freezer 7 Refrigerator 9 Compressor 10 Defrost heater 11 Defrost temperature detection means 18 Operation timer 20 Defrost timer

Claims (1)

[Claims] 1. A freezing compartment, a refrigerating compartment, temperature detecting means for detecting the temperature of the freezing compartment to stop the operation of the compressor of the refrigeration cycle, and a defrost heater for melting frost attached to the cooler of the refrigeration cycle. And detecting the temperature of the cooler, and when the temperature of the cooler rises in the defrost heater, defrost temperature detecting means for stopping energization of the defrost heater, and energization time of the defrost heater, It consists of a defrosting timer that integrates, integrates the operating time of the compressor, integrates for a predetermined time, and then controls the energization of the defrosting heater. Refrigerator equipped with a means for returning to the initial state.