JPH05203317A - Control device of refrigerator - Google Patents

Abstract

PURPOSE:To quickly stabilize a refrigerator to a predetermined temperature at a high load with high temperature and much moisture in the summer season and the like by detecting fresh air temperature and changing initiation tempera ture for rotating a fan at a high speed based upon a detection result. CONSTITUTION:In control means 13 for controlling a compressor 4 and a cold air circulation fan 6 based upon an output signal from refrigerator temperature detector means 8 serving to detect temperature in a freezing chamber of a refrigerator, there is provided fresh air detector means 15 for detecting fresh air. It is judged whether refrigerator temperature is higher or lower than set temperature T1 (-22 deg.C for example),and if lower, the compressor 4 and the fan 6 are interrupted. In contrast, if the refrigerator temperature is higher than the set value T1, the fan 6 is rotated at a high speed through revolution control means 11, and the compressor 4 is operated. Then, fresh air is checked, and if it is higher than set temperature (15 deg.C for example) the refrigerator temperature is compared with a set valve T4 (-15 deg.C for example), and if the detected value is higher than the set value, the fan 6 is rotated at a high speed as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a cold air forced circulation type refrigerator, and more particularly to a controller for a refrigerator equipped with a variable speed fan for cold air circulation.

[0002]

2. Description of the Related Art Conventionally, a control device for a refrigerator of this type has been conventionally devised, for example, in Japanese Utility Model Laid-Open No. 64-31966.
It was common to carry out the configuration as shown in the publication.

The structure will be described below with reference to FIGS. 4 to 6. In the figure, 1 is a refrigerator main body, 2 is a freezer compartment, 3 is a refrigerator compartment, 4 is a compressor, and a cooler 5 and a blower 6 for circulating cold air are arranged between the refrigerator compartment 2 and the refrigerator compartment 3. . Reference numeral 7 is a damper thermostat for adjusting the amount of cold air in the refrigerator compartment 3. Reference numeral 8 denotes an in-compartment temperature detecting means including a thermistor which detects the temperature of the freezer compartment 2 and sends an operation control signal for the compressor 4 and the blower 6.

Next, the control circuit will be described. Reference numeral 9 is a control means composed of a microcomputer or the like, and the inside temperature detecting means 8 is connected to its input terminal. Driving means 10 for moving the compressor 4 and rotation speed control means 11 for changing the rotation speed of the blower 6 to drive the blower 6 are connected to the output terminal. The control means 9 has a timer 12 which starts counting when the inside temperature detection means 8 reaches a set temperature.

Next, the operation flow of the compressor 4 and the blower 6 will be described with reference to FIG. First, at step 201, the temperature of the inside temperature detecting means 8 is set value T1 ° C. (for example, −22 ° C.).
It is determined whether it is higher or lower, and if it is lower, the process proceeds to step 202 and the flag is reset. This flag is set under the condition that the blower 6 is rotated at a high speed, and is reset under the condition that it is stopped. That is, once the high-speed rotation condition is reached, it is a flag that means a latch for maintaining high-speed rotation (without becoming normal rotation) until the stop condition is reached.

Subsequently, in steps 203 and 204, the blower 6 is stopped and the compressor 4 is stopped. If it is determined in step 201 that the temperature of the inside temperature detecting means 8 is high, the process proceeds to step 205 to check the flag. If the flag is set, step 20
6 and 207, the blower 6 is operated at high speed and the compressor 4 is operated. If the flag is reset in step 205, the process proceeds to step 208, and the temperature of the in-compartment temperature detecting means 8 is compared with a set value T3 ° C. (for example, −12 ° C.), and if it is low, the process proceeds to step 209. In step 209, the temperature of the in-compartment temperature detecting means 8 is set value T2 ° C. (for example, −18).
C.) and when it is lower than the above, the process proceeds to step 203.

On the contrary, when the temperature of the in-compartment temperature detecting means 8 is high, the process proceeds to steps 210 and 211, in which the blower 6 is normally rotated and the compressor 4 is operated. If the temperature is high in step 208, the process proceeds to step 212, the timer 12 in the control means 9 starts counting, and the value of the timer 12 is checked in step 213. Timer 1 in step 213
If the value of 2 is shorter than the set value (for example, 5 minutes), the process proceeds to step 210. On the contrary, when the time of the timer 12 becomes long, the routine proceeds to step 214, the flag is set, and the routine proceeds to step 206.

When the temperature of the freezer compartment 2 is lower than the above flow (T1 ° C. or lower), both the blower 6 and the compressor 4 are stopped, and when the temperature of the freezer compartment 2 rises and becomes higher than the set value (T2 ° C.), the blower 6 is a normal rotation operation, and the compressor 4 is also operated. The above steps are repeated so that the freezer compartment 2 is controlled to always maintain an appropriate temperature (for example, -20 ° C).

Further, when hot food or a large amount of purchased food to be frozen or the like that is loaded into the freezer compartment 2 is stored in the freezer compartment 2, when the temperature of the freezer compartment 2 becomes high (T3 ° C. or higher), a timer is provided. 12 starts counting and when the set time continues, the blower 6 is rotated at a high speed and the compressor 4 is also operated. Therefore, the temperature of the freezer compartment 2 at the time of high load is quickly and within the set temperature (T1 ° C). To T2 ° C.).
Therefore, the freshness of the food is kept fresh.

[0010]

However, in the above configuration, when the outside air temperature is high and when the outside air temperature is low, food is charged and the temperature of the inside temperature detecting means rises,
Even if the blower operates at high speed, it takes time for the food to cool down if the cooling capacity of the cooler is different and the outside air temperature is high, and the temperature of food near the input food also rises. There was a problem of damaging it.

In view of the above-mentioned drawbacks of the conventional example, the present invention detects the outside air temperature to match the actual use condition, that is, the temperature detected by the inside temperature detecting means for varying the rotation speed of the blower according to the outside air temperature. Since it is changed, a refrigerator with a stable internal temperature is always provided.

[0012]

In order to solve the above-mentioned drawbacks, a control device for a refrigerator according to the present invention comprises an inside temperature detecting means for stopping the operation of a compressor and a blower, and an outside air temperature detecting means for detecting an outside air temperature. When the outside temperature detecting means is above the set temperature, the set temperature for changing the rotation speed of the blower is changed by the rotation speed control means for changing the rotation speed of the blower when the inside temperature detecting means detects the set temperature or more. It is provided with a control means.

[0013]

In the refrigerator of the present invention, the refrigerator temperature detecting means having the above-mentioned configuration detects the temperature of the freezer and stops the operation of the blower for forcedly circulating the cool air cooled by the compressor and the cooler. At the time when the temperature above the temperature is detected,
When the outside air temperature is detected and the set temperature is higher than a predetermined set temperature, the set temperature of the in-compartment temperature detecting means for causing the blower to operate at high speed is set to be low.

[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, 13 is a control means, which is a freezer compartment 2.
The outside air temperature detecting means 15 for detecting the outside air temperature, which includes a thermistor or the like provided on the surface of the door 14, is connected.

In such a configuration, referring to FIG. 3, the compressor 4
The operation flow of the blower 6 will be described.

First, in step 1, the inside temperature detecting means 8
It is determined whether the temperature is higher or lower than the set value T1 ° C. (for example, −22 ° C.), and if it is lower, the process proceeds to step 2 and the flag is reset. Then, the process proceeds to step 3 and step 4 to stop the blower 6 and stop the compressor 4. If it is determined in step 1 that the temperature of the inside temperature detecting means 8 is high, the process proceeds to step 5 to check the flag. If the flag is set, the operation proceeds to steps 6 and 7 to operate the blower 6 at high speed and operate the compressor 4.

If the flag is reset in step 5, the process proceeds to step 8 and the temperature of the in-compartment temperature detecting means 8 is compared with a set value T2 ° C. (eg, -18 ° C.), and if it is low, the process proceeds to step 2. In step 8, if the temperature of the inside temperature detecting means 8 is high, the process proceeds to step 9. In step 9, the temperature of the outside air temperature detecting means 15 is checked, and if it is higher than the set temperature (for example, 15 ° C.), the process proceeds to step 10, and if it is less, the process proceeds to step 11. In step 10, the temperature of the inside temperature detecting means 8 is compared with the set value T4 ° C. (for example, −15 ° C.), and if it is higher, the process proceeds to step 12. The flag is set in step 12 and the process proceeds to step 6.

Further, in step 10, the inside temperature detecting means 8
If the temperature is judged to be low, step 13, step 1
4, the blower 6 is normally rotated and the compressor 4 is operated. If the temperature of the outside air temperature detecting means 15 is lower than the set temperature in step 9 above, the process proceeds to step 11, and if the temperature of the inside temperature detecting means 8 is higher than the set value T3 ° C. (for example −12 ° C.), step 12 is reached. Then, the blower 6 is rotated at high speed, and if the blower 6 is low, the routine proceeds to step 13 where the blower 6 is normally rotated.

When the temperature of the freezing compartment 2 is lower than the above flow (T1 ° C. or lower), both the blower 6 and the compressor 4 are stopped, and when the temperature of the freezing compartment 2 rises and becomes higher than the set value (T2 ° C.), the blower 6 is a normal rotation operation, and the compressor 4 is also operated. The above steps are repeated so that the freezer compartment 2 is controlled to always maintain an appropriate temperature (for example, -20 ° C).

When hot food or a large quantity of purchased food to be frozen, etc., is stored in the freezing compartment 2, the temperature of the freezing compartment 2 becomes higher than T2 ° C. and the blower 6 normally rotates. When the operation is started and the temperature of the outside air temperature detection means 15 at that time is higher than the set temperature, the temperature of the blower 6 for the high speed rotation operation is lowered (T4 ° C. (−15 ° C.)) to quickly start the high speed rotation operation. To do. That is, when the outside air is high, the temperature of the freezer compartment 2 under high load can be quickly and quickly brought to within the set temperature range (T1 ° C to T2 ° C). Therefore, the freshness of the food is kept fresh.

[0022]

As described above, according to the refrigerator of the present invention, the following effects can be obtained. 1) Because the temperature of the outside air is detected and the temperature at which the blower starts rotating at a high speed is changed, it is possible to quickly stabilize the predetermined temperature inside the warehouse during high load such as high temperature and high humidity in summer. There is an effect. 2) Since the number of revolutions of the blower is appropriately changed only when necessary, there is an effect that noise or electricity bill can be reduced.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of the refrigerator of the same refrigerator.

FIG. 3 is a flowchart showing control of a compressor and a blower of the refrigerator.

FIG. 4 is a vertical sectional view of a conventional refrigerator.

FIG. 5 is a control circuit diagram of a conventional refrigerator.

FIG. 6 is a flowchart showing control of a compressor and a blower of a conventional refrigerator.

[Explanation of symbols]

 2 Freezing room 3 Refrigerating room 4 Compressor 5 Cooler 6 Blower 8 Inside temperature detection means 11 Rotation speed control means 13 Control means 15 Outside air temperature detection means

Claims (1)

[Claims] 1. A freezer compartment, a refrigerating compartment, and an in-compartment temperature at which the temperature of the freezer compartment is detected and the blower for forcedly circulating the cool air cooled by the compressor of the refrigeration cycle and the cooler of the refrigeration cycle is stopped. The external air temperature detecting means includes an external air temperature detecting means for detecting an external air temperature, and a rotational speed control means for varying the rotational speed of the blower when the internal temperature detecting means detects a temperature equal to or higher than a preset temperature. A control device for a refrigerator comprising control means for changing the set temperature of the in-compartment temperature detecting means for changing the rotation speed of the blower when the temperature is equal to or higher than the set temperature.