KR19980054657A - Cooling temperature control method of refrigerator using air curtain fan - Google Patents

Abstract

The present invention relates to a method for uniformly controlling the temperature in a refrigerator by using an air curtain fan attached to the refrigerator, the method comprising: determining, by a microcomputer, whether a defrost operation is being performed while a refrigerator is normally operated using a refrigerator compartment fan; Continuously performing normal operation of the refrigerator in the defrosting operation state, and detecting the temperature of each part using the upper right and lower left sensors of the refrigerating compartment if the defrosting operation is not performed; Comparing an absolute value of a temperature difference between the upper right part and the upper left part with a preset temperature; Operating an air curtain fan when the absolute value of the temperature difference is greater than or equal to a preset temperature, and returning to a process of performing normal operation of the refrigerator when it is less than the preset temperature; Comparing an absolute value of a temperature difference between the upper right part and the upper left part with a preset temperature during the air curtain fan operation; And continuously operating the air curtain fan when the absolute value of the temperature difference is greater than the preset temperature, and turning off the air curtain fan and returning to the normal operation of the refrigerator when the absolute value of the temperature difference is greater than the preset temperature.

Description

Cooling temperature control method of refrigerator using air curtain fan

The present invention relates to a method of controlling to maintain a constant temperature in the refrigerator by using an air curtain fan attached to the refrigerator.

Looking at the refrigeration cycle of the refrigerator, in general, the high-temperature high-pressure refrigerant gas discharged from the compressor passes through the condenser, the heat is discharged to the outside to become a high-pressure liquid refrigerant, and the high-pressure liquid state through the dryer as impurities and moisture This is removed and passes through the capillary tube, while passing through the capillary tube, the liquid refrigerant expands into a gas-liquid mixed state that is easy to evaporate, and the cold air is supplied to the refrigerator by a circulation repetition which absorbs the surrounding heat through the evaporator and gasifies. Is done.

Recently, when the operation of the refrigerator is overloaded, or when the door of the refrigerating chamber is opened and the outside air flows to increase the temperature of the refrigerating chamber, the overall temperature of the refrigerating chamber is kept at a normal temperature compared to the conventional operation method using only a compressor and a refrigerating fan. In order to recover quickly, an additional air curtain fan is installed in the refrigerating chamber.

That is, during normal operation of the refrigerator (S31), when the door is open or higher than the normal temperature due to the input of an overload (S32), the compressor is operated (S33), after operating the air curtain fan and cooling fan (S34), If the temperature is normal temperature (S35), the operation returns to normal operation (S36), and if the temperature is higher than the normal temperature (S36), the above steps S33 to S35 are repeated.

However, according to the above-described method of operating the air curtain fan and the refrigerating fan when the door of the refrigerator is opened, there is a problem that the temperature distribution in the refrigerating chamber becomes uneven as the refrigerator becomes larger (for example, 500 l or more).

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and the air curtain fan for controlling the temperature in the refrigerator constantly by operating the air curtain fan when the change in the upper and lower left temperature differences in the refrigerating chamber is greater than the set temperature. The purpose is to provide a method for controlling the temperature using

One preferred embodiment of the constant temperature control method using the air curtain fan according to the present invention for achieving the above object comprises the steps of determining in the microcomputer whether the defrosting operation during the normal operation of the refrigerator using the refrigerator compartment fan; Continuously performing normal operation of the refrigerator in the defrosting operation state, and detecting the temperature of each part using the upper right and lower left sensors of the refrigerating compartment if the defrosting operation is not performed; Comparing an absolute value of a temperature difference between the upper right part and the upper left part with a preset temperature; Comparing an absolute value of a temperature difference between the upper right part and the upper left part with a preset temperature; A multi-step comparing the absolute value of the temperature difference between the upper right part and the upper left part with a preset temperature; Operating an air curtain fan when the absolute value of the temperature difference is greater than or equal to a preset temperature, and returning to a process of performing normal operation of the refrigerator when it is less than the preset temperature; Comparing an absolute value of a temperature difference between the upper right part and the upper left part with a preset temperature during the air curtain fan operation; And continuously operating the air curtain fan when the absolute value of the temperature difference is greater than the preset temperature, and turning off the air curtain fan and returning to the normal operation of the refrigerator when the absolute value of the temperature difference is less than the preset temperature. It features.

1 is a block diagram of an apparatus for controlling the temperature of a refrigerator using an air curtain fan according to the present invention,

2 is a flowchart sequentially illustrating a method for controlling a constant temperature of a refrigerator using an air curtain fan according to the present invention.

3 is a flowchart illustrating a method of controlling a temperature of a refrigerator using a conventional air curtain fan in order.

* Description of the symbols for the main parts of the drawings *

11: Upper right sensor of the fridge 12: Lower left sensor of the fridge

13: Sensor signal detection means 14: Microcomputer

15: air curtain fan drive means 16: air curtain fan

17: refrigerator compartment fan drive means 18: refrigerator compartment fan

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of an apparatus for controlling the temperature of a refrigerator using an air curtain fan according to the present invention, and FIG. 2 is a flowchart sequentially illustrating a method for controlling the temperature of a refrigerator using an air curtain fan according to the present invention.

First, referring to Figure 1 briefly described the components of the constant temperature control device of the refrigerator using the air curtain fan according to the present invention, the upper right temperature sensor 11 for detecting the upper right temperature of the refrigerator compartment, the lower left of the refrigerating compartment Lower left sensor 12 for sensing temperature, sensor signal detecting means 13 for detecting changes in the upper right and lower left, and air curtain fan driving means 17 for driving an air curtain fan. And a refrigerator curtain fan drive means 17 for driving the air curtain fan 18, a refrigerator compartment fan, a refrigerator compartment fan 18, and a microcomputer 16 for controlling the above means.

Referring to FIG. 2, the method for controlling the temperature of the refrigerator using the air curtain fan according to the present invention is described in detail. During the normal operation of the refrigerator using the refrigerator compartment fan, the refrigerator is in defrost operation. Judging by the microcomputer (S22), if the defrosting operation state of the refrigerator continues to the normal operation of the refrigerator (S21), if not in the defrosting operation state using the upper and lower left sensors of the refrigerating chamber to detect the sensor signal temperature Detect by means (S23). Subsequently, the microcomputer compares the absolute value of the temperature difference between the upper right part and the upper left part with a preset temperature (S24). If the absolute value of the temperature difference is greater than or equal to the preset temperature, the microcomputer outputs a driving control signal to the air curtain fan driving means. If the curtain fan is operated (S25), and less than the preset temperature, the curtain fan returns to the process of performing normal operation of the refrigerator (S21). Next, during operation of the air curtain fan (S25), the absolute value of the temperature difference between the upper right part and the upper left part is compared with a preset temperature (S26). If the absolute value of the temperature difference is greater than the preset temperature, the air curtain fan is continuously operated. In operation S25, when the temperature is lower than the preset temperature, the air curtain fan is turned off in operation S27, and the process returns to the process of performing normal operation of the refrigerator in operation S21.

According to the method of the present invention as described above, if the change in the upper and lower left temperature difference in the refrigerator compartment is greater than the set temperature, by operating the air curtain fan to control the temperature in the refrigerator constantly to minimize the temperature change in the refrigerator to keep the food Freshness can be maintained for a long time, and the effect of greatly improving the reliability of the product.

Claims (1)

(1) determining, by the microcomputer, whether the defrosting operation is being performed during the normal operation of the refrigerator using the refrigerator compartment fan; (2) continuously performing normal operation of the refrigerator in the defrosting operation state, and detecting the temperature of each part using the upper right and lower left sensors of the refrigerating compartment if the defrosting operation is not performed; (3) comparing an absolute value of the temperature difference between the upper right part and the upper left part with a preset temperature; (4) operating an air curtain fan if the absolute value of the temperature difference is greater than or equal to a preset temperature, and returning to a process of performing normal operation of the refrigerator if less than the preset temperature; (5) comparing the absolute value of the temperature difference between the upper right part and the upper left part with the preset temperature during the air curtain fan operation; And (6) continuously operating the air curtain fan when the absolute value of the temperature difference is greater than the preset temperature, and turning off the air curtain fan and returning to the normal operation of the refrigerator when the absolute value of the temperature difference is less than the preset temperature; Constant temperature control method of the refrigerator using an air curtain fan, characterized in that made.