JPH05203323A - Refrigerator - Google Patents

Abstract

PURPOSE:To prevent refrigerated foods from being damaged owing to their being frozen as a result of long term operation which is erroneously caused by noise and the like in control of a damper thermostat. CONSTITUTION:There are provided refrigerator chamber detector means 10 for detecting temperature in a refrigerator, a damper thermostat 11, control means 19 comprised of an operation timer 20 for counting the time the damper thermostat 11 is operated, driving means 17 for driving the damper thermostat 1, and damper thermostat condition detector means 18 for detecting the condition of the damper thermostat 11.

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. Reference numeral 10 is a refrigerating compartment temperature detecting means such as a thermistor for detecting the temperature of the refrigerating compartment 7, and a damper thermostat 1 for adjusting the inflow amount of cold air at the inlet of the refrigerating compartment 7.
1 is provided.

Next, the control circuit will be described. Reference numeral 12 is a control means, which is a microcomputer (CPU) 13 or R
It is composed of AM14, ROM15, etc., and ROM1
5 stores a program for determining the next operation based on the order of confirmation of the operation and the state at that time.

The output of the refrigerating compartment temperature detecting means 10 is input to the control means 12. The control means 12
The drive means 16 for moving the compressor 9 and the drive means 1 for opening and closing the damper-thermostat 11.
7 is connected. Also, damper thermostat 1
1 includes a damper thermostat state detecting means 18 for detecting whether the damper thermostat 11 is in the "open" state or the "closed" state, and its output is inputted to the control means 12.

The operation of the above structure will be described with reference to FIG. When the power is turned on, RA is set as step 1
All data in M14 is cleared and initialization is performed. Next, as step 2, the state of the refrigerating room temperature detecting means 10 is fetched and stored in the RAM 14. Then, as step 3, it is judged from the RAM 14 whether or not the refrigerating room temperature detecting means 10 has detected the temperature equal to or higher than the set temperature. At this time, if the temperature is equal to or higher than the set temperature, the state of the damper-thermostat 11 of the RAM 14 is checked in step 4, and if the "open" is not set, the state of the damper-thermostat 11 is set to "5" in the RAM 14 as step 5. Remember that it is "open".

Then, in step 6, the state of the damper thermostat 11 is output, in step 7, the input from the damper thermostat state detecting means 18 is taken in, and in step 8, the state of the damper thermostat 11 is "open".
If it is "open", return to step 2, and if not "open", return to step 6. If "open" is set in step 4, the process returns to step 2.

In step 3, the refrigerating compartment temperature detecting means 1
If 0 is less than or equal to the set temperature, the process proceeds to step 9, RAM1
The state of the damper-mostor 11 of 4 is checked, and if "closed" is set, the procedure returns to step 2. If "closed" is not set, the procedure proceeds to step 10 and the damper-server.
The fact that the state of the mostat 11 is "closed" is stored, the process proceeds to step 11, the damper-mosterst state memory is output to operate the damper-mosterst 11, and at step 12, the damper-thermostat state detecting means 18 is operated. Capture the input of. If the state of the damper thermostat 11 is "closed" in step 13, the process returns to step 2, and if it is not "closed", the process returns to step 11.

If the temperature of the refrigerating compartment temperature detecting means 10 is high, the damper thermostat 11 is opened to cool the inside of the refrigerator, and if the temperature of the refrigerating compartment temperature detecting means 10 is low, the damper thermostat 11 is repeated. Prevents the interior from being too cold.

[0011]

However, during such a cooling operation, when the data of the RAM 14 becomes abnormal due to noise or the like, the step of the ROM 15 is broken, or the operation is completely different from the normal operation, For example, when it is determined that the RAM 14 collapses in step 8 and the damper-thermostat 11 is actually "open" but "closed", or the RAM 14 collapses in step 13 and the damper thermostat 11 When it is judged to be "open" even though it is actually "closed", the damper thermostat 11 continues to operate and the temperature of the refrigerating compartment 7 becomes extremely low (especially when the outside air temperature is low) and is below 0 degree. Therefore, there was a problem that frozen foods were frozen.

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

[0013]

In order to solve the above-mentioned problems, the refrigerator of the present invention operates the operation timer when the damper-thermostat is turned on, and after adding the predetermined time or more, the refrigerator is turned on. It is configured to do.

[0014]

According to the present invention, in the above-described structure, when the apparatus is in the supercooled state due to an abnormal operation, the power is turned on to perform the correct cooling operation again. Can be prevented.

[0015]

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, an operation timer 20 is newly added to the control circuit 19. The operation timer 20 integrates the operating state of the damper-thermostat 11 for a certain period of 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 M14 is cleared and initialization is performed. Next, as step 2, the state of the refrigerating room temperature detecting means 10 is fetched and stored in the RAM 14. Then, as step 3, it is judged from the RAM 14 whether or not the refrigerating room temperature detecting means 10 has detected the temperature equal to or higher than the set temperature. At this time, if the temperature is equal to or higher than the set temperature, the state of the damper-thermostat 11 of the RAM 14 is checked in step 4, and if the "open" is not set, the state of the damper-thermostat 11 is set to "5" in the RAM 14 as step 5. Remember that it is "open". Then, in step 6, the damper-thermostat 1
The state of 1 is output, and the process returns to step 2.

If "open" is set in step 4, the process returns to step 2. If the temperature of the refrigerating compartment temperature detecting means 10 is lower than the set temperature in step 3, the process proceeds to step 7 and the state of the damper-thermostat 11 of the RAM 14 is checked. If "closed" is not set, the process proceeds to step 8 to memorize that the state of the damper-moster 11 is "closed" and proceeds to step 6 to output the damper-mostat state memory and output the damper -Mostmost 11 is activated.

If the temperature of the refrigerating compartment temperature detecting means 10 is high, the damper thermostat 11 is opened to cool the inside of the refrigerator, and if the temperature of the refrigerating compartment temperature detecting means 10 is low, the damper thermostat 11 is turned on. Prevents the interior from being too cold.

However, during such a cooling operation, the data in the RAM 14 becomes abnormal due to noise or the like, and the RO
When the step of M15 collapses or the operation is completely different from the normal operation, for example, the RAM 14 in step 8
Deterioration, the damper-mostort 11 is actually "
When it is judged to be "closed" even though it is in the "open" state, or in step 13, the RAM 14 collapses and the damper thermostat 11 is actually in the "closed" state but "open".
When it is determined that the temperature of the damper thermostat 11 continues, the temperature of the refrigerating compartment 7 becomes extremely low (especially when the outside air temperature is low), and the temperature is below 0 ° C., which causes the frozen food to be frozen. there were.

Therefore, after confirming the state of the damper thermostat 11 in step 8, if the damper thermostat 11 is not opened, the operation timer 20 is counted in step 14, and step 1
If the operation timer 20 does not count up in 5, the procedure returns to step 6, and if it counts in step 15, the procedure proceeds to step 16 to clear the operation timer 20 and returns to step 1 to restore the refrigerator to the initial state when the power is turned on. . In step 8, the state of the damper thermostat 11 is "open".
If so, the operation timer 20 is cleared in step 17 and the process returns to step 2.

If the state of the damper thermostat 11 is not "closed" in step 13, step 18
If the operation timer 20 is counted in step 19 and it is not counted up in step 19, the process returns to step 11
If it is counted up at 9, the operation proceeds to step 20, the operation timer 20 is cleared, and then the operation returns to step 1 to bring the refrigerator into the initial state when the power is turned on. If the damper thermostat 11 is "closed" in step 13, step 2
After proceeding to 1 and clearing the operation timer 20, the procedure returns to step 2.

In this way, the damper-thermostat 1
1 counts the operating time, and when it reaches the set time, the process returns to step 1 to clear all the data in RAM 14, read the normal data from step 2 and perform the normal cooling operation again. Therefore, due to noise etc., R
When the data of the AM 14 becomes abnormal and the damper-mostat 11 continues to move for a long time, it is possible to prevent food from freezing by setting the power-on state.

[0024]

As described above, according to the refrigerator of the present invention, it is provided with an operation timer that operates when the damper thermostat is operating, and when the timer integrates for a predetermined time, the refrigerator is turned on. Therefore, in the case of malfunction due to noise or the like, it is possible to prevent the damper-thermostat from continuously moving, freezing the refrigerated food and damaging it. In addition, since the user does not need to notice the malfunctioning state and disconnect the power source by himself, it has a great effect.

[Brief description of drawings]

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

[Fig. 2] Flow chart of the refrigerator

FIG. 3 is a sectional view of the refrigerator.

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

FIG. 5: Flow chart of the refrigerator

FIG. 6 is a sectional view of the refrigerator.

[Explanation of symbols]

 1 Refrigerator 6 Freezer 7 Refrigerator 9 Compressor 10 Refrigerator temperature detector 11 Damper thermostat 18 Damper thermostat state detector 20 Operation timer

Claims (1)

[Claims] 1. A freezer compartment, a refrigerating compartment, a refrigerating compartment temperature detecting means for detecting a temperature of the refrigerating compartment and opening / closing a damper thermostat of the refrigerating compartment, and the damper thermostat are in an "open" state. Or a "closed" state, a damper thermostat state detection means, and an operation timer that operates when the damper-thermostat is in operation. Refrigerator equipped with means for returning to the initial state when it is turned on.