JPH07122542B2 - Refrigerator temperature controller - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a refrigerator.

[0002]

2. Description of the Related Art Conventionally, in controlling the temperature of a refrigerator, a temperature sensor provided in a freezing chamber detects the temperature inside the refrigerator and compares the temperature inside the refrigerator set in a control unit to operate a cooling compressor. In this way, the temperature inside the refrigerator is controlled within the set range. In this case, depending on the mounting position of the temperature sensor and how to put food etc. in the refrigerator, the circulation of air in the refrigerator is hindered
In the part away from the temperature sensor, the temperature is not cooled down to the set temperature, which causes a problem that the temperature in the freezer compartment varies greatly. In addition, as the size of refrigerators has increased in recent years, variations in the temperature inside the freezing chamber have become even greater, and when a large amount of frozen food or the like is loaded at one time, the temperature is controlled within a set temperature range near the temperature sensor. However, it is left in a state where it is not cooled so much in a distant portion, which causes a problem in keeping the freshness of food, and it is necessary to take measures such as forcibly circulating the air in the refrigerator to make it uniform.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a temperature control device for a refrigerator that keeps variations in temperature in the freezing chamber to a low temperature. .

[0004]

In order to achieve the above-mentioned object, a plurality of temperature sensors are separately arranged in a freezing chamber, and a cooling compressor is operated based on the temperature detected by one of the temperature sensors. When the temperature reaches the stop condition of the cooling compressor and the temperature detected by the other temperature sensor is above a certain temperature, the cooling is continued until the detected temperature reaches the stop condition of the cooling compressor. The operation of the compressor was continued.

[0005]

According to the above construction, a plurality of temperature sensors are provided separately in the freezing compartment, and in normal control, the detected value from the first temperature sensor is taken into the control section to control the cooling compressor. When the detection value of the first temperature sensor reaches the lower limit value of the set temperature range (condition for stopping the cooling compressor) during cooling of the inside of the refrigerator, the detection value of another temperature sensor is equal to or higher than a certain value, or When the difference from the detection value of the first temperature sensor is a certain value or more, the compressor is controlled to operate until the detection values of the other temperature sensors reach the lower limit value of the set temperature range. It is possible to reduce variations in the temperature in the room to be small and low.

[0006]

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a block diagram showing the configuration of the present invention. A control signal from the operation panel is input to the control unit 2 via the setting input circuit 1 and stored in the memory 3. Signals from the first temperature sensor F1 and the plurality of temperature sensors F2 are supplied to the control unit 2
The digital signal is converted into a digital signal by the A / D converter 4 built into the comparator, enters the comparison circuit, and is compared with the control condition stored in the memory 3. Based on the difference, a control signal is output to the compressor control circuit 5 to output the control signal to the compressor 6. It controls the driving. FIG. 2 is a perspective view of essential parts showing a state in which the first temperature sensor F1 and the temperature sensor F2 of the present invention are mounted in the freezing compartment.

FIG. 3 is a flow chart showing the details of the present invention. In the refrigerator, the controller 2 receives the signal from the first temperature sensor F1.
, The cooling compressor 6 is controlled and operated to cool the freezing compartment. At this time, if a large amount of refrigerating load is stored, the first temperature sensor F1 side and the temperature sensor F2 side of FIG. 2 are shut off, and a temperature difference occurs. In this state, when the detected value of the first temperature sensor F1 reaches the lower limit value of the set control temperature range (21), the control unit 2 causes the detected value of the temperature sensor F2 to be set in advance at the set temperature T. If less than (22)
When the operation of the compressor 6 is stopped (25), and when it is above (22), the operation of the compressor 6 is continued as it is (23), and when the detected value of the temperature sensor F2 reaches the lower limit value of the control temperature range. (2
4) Stop the operation of the compressor 6 (25). When the temperature in the freezer compartment rises and the detected value of the first temperature sensor F1 reaches the upper limit value of the control temperature range (26), the operation of the compressor 6 is started (27) and the operation returns to the cooling operation.

FIG. 4 is a graph showing changes in the freezer compartment temperature in a time series according to the present invention. Initially, the first compartment temperature sensor F1 turns on the compressor 6 within the control temperature range by the first temperature sensor F1.
-Temperature sensor that is off control and is away from the first temperature sensor F1
The first temperature sensor F1 has a slight temperature difference around F2.
Shows the temperature change following the. In this state, if a large amount of refrigeration load is stored on the temperature sensor F2 side,
The temperature inside the refrigerator on the F2 side rises sharply, but the first temperature sensor
There is not much change on the F1 side, and when the upper limit value of the control temperature range is reached, the compressor 6 is operated to start cooling operation, and when the lower limit value of the control temperature range is reached, the detected value of the temperature sensor F2 is the set temperature T.
If the temperature does not fall below the range, the operation of the compressor 6 is continued and the compressor 6 is stopped when the detected value of the temperature sensor F2 reaches the lower limit value of the control temperature range. This allows
The temperature difference between the first temperature sensor F1 side and the temperature sensor F2 side is compressed, and it is possible to reduce variations in the internal cold storage temperature as compared with the conventional internal cold storage temperature change shown in FIG.

[0009]

As described above, in the present invention, a plurality of temperature sensors are arranged in a position separated from the first temperature sensor in the freezing compartment, and the detected value from the first temperature sensor is within the set temperature range. When the lower limit value of the temperature is reached, the detected values of other temperature sensors are compared with the lower limit value of the set temperature, and the compressor is operated until the respective detected values reach the lower limit value of the set temperature range. Even if a large amount of refrigeration load is applied at one time and the temperature inside the refrigerator rises locally, the temperature inside the refrigerator can be immediately followed to reduce the temperature inside the refrigerator and reduce variations in the temperature inside the refrigerator. be able to.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a perspective view of a main part.

FIG. 3 is a flow chart showing details of the present invention.

FIG. 4 is a graph showing changes in the internal cold storage temperature of the present invention in time series.

FIG. 5 is a graph showing a conventional change in internal temperature in a time series.

[Description of symbols] 1 setting input circuit 2 control unit 3 memory 4 A / D converter 5 compressor control circuit 6 compressor F1 first temperature sensor F2 other temperature sensor

Claims (2)

[Claims] 1. A temperature control device for a refrigerator in which a temperature sensor is arranged in a freezing compartment and the operation of a cooling compressor is controlled based on the temperature inside the refrigerator detected by the temperature sensor. When a plurality of temperature sensors are arranged separately, the operation of the cooling compressor is controlled based on the temperature detected by one of the temperature sensors, and when the temperature reaches the stop condition of the cooling compressor, If the temperature detected by the other temperature sensor is above a certain temperature, the temperature of the refrigerator is characterized in that the operation of the cooling compressor is continued until the detected temperature reaches the stop condition of the cooling compressor. Control device. 2. When one of the temperature sensors reaches a condition for stopping the cooling compressor, and the difference from the temperature detected by the other temperature sensor is a certain value or more, the detected temperature is the cooling compressor. The temperature control device for a refrigerator according to claim 1, wherein the operation of the cooling compressor is continued until the stop condition is reached.