JP2672702B2 - Refrigerator control device - Google Patents

Description

Description: [Object of the invention] (Field of industrial application) The present invention relates to a control device for a refrigerator, and more particularly to a heater for external temperature compensation and a cooling fan provided in a machine room or the like. Is related to the control of.

(Problems to be Solved by Related Art and Invention) A cooling fan is provided in a machine room of a refrigerator in order to prevent heating of a compressor. This cooling fan is for maintaining the cooling performance of the compressor even when the outside air temperature is high.

Further, as a heater for compensating the outside air temperature, a heater for compensating the inside temperature is provided at the rear of the inner box of the refrigerating compartment.

A transformer is provided between the cooling fan and heater and the power supply. This transformer has a problem that the size of the transformer is considerably large because the cooling fan and the heater consume a large amount of power.

Further, the control method of the cooling fan operates when the outside air temperature is higher than a certain level. However, because the determination of ON / OFF of this cooling fan is based on one outside air temperature level, there is a large variation in cooling performance. For example, even if a small amount of cooling is required, the cooling fan is turned on.
Therefore, the power consumption may be wasted.

The heater is also activated when the outside air temperature is lower than a certain level. However, since this judgment is also made based on one outside air temperature level, the temperature inside the refrigerator is likely to be uneven, and the power consumption is often wasted. Further, in order to control the outside air temperature in multiple stages, there is a problem that a plurality of heaters and a plurality of switches are provided, which results in a large cost increase.

Therefore, the present invention provides a control device for a refrigerator in which the cooling fan or the heater is operated at a temperature according to the outside air temperature without enlarging the transformer connected to the cooling fan and the heater.

[Structure of the Invention] (Means for Solving the Problems) A control device for a refrigerator according to the present invention includes a compressor (1) provided in a machine room of the refrigerator and an outside air temperature detection sensor (2) for detecting the temperature outside the refrigerator. ), A cooling fan (3) provided in the machine room, a heater (4) for ambient temperature compensation, and a transformer (transformer for supplying electric power from a power source to the cooling fan (3) and the heater (4). 5) and, when the compressor (1) is operating, the cooling fan (3) can be intermittently moved in a time-sharing manner for a fixed time, and the operating time of the cooling fan (3) increases as the outside air temperature detected by the outside air temperature detection sensor (2) increases. Is gradually increased so that the heater (4) can be intermittently moved in a time-sharing manner for a fixed time when the compressor (1) is stopped, and the lower the ambient temperature detected by the ambient temperature detection sensor (2), the lower the heater (4).
And a control device (6) for controlling so as to gradually increase the operating time.

(Operation) With the refrigerator control device having the above configuration, the cooling fan 3
Is operated only when the compressor 1 is operating, and the heater 4 is operated only when the compressor 1 is stopped. Therefore, since the cooling fan 3 and the heater 4 do not operate at the same time, the electric power supplied to the cooling fan 3 and the heater 4 does not increase, and the transformer 5 supplying the electric power to the heater 4 and the cooling fan 3 does not operate. No need to make it big. Further, although the outside air temperature is controlled in multiple stages, a plurality of heaters and a plurality of switches are not required.

The intermittent movement of the cooling fan 3 lengthens the operating time stepwise as the outside air temperature detected by the outside air temperature detection sensor 2 increases, so that cooling according to the outside air temperature becomes possible.

As for the intermittent motion of the heater 4, as the outside temperature detected by the outside temperature detection sensor 2 is lower, the operation time is set to be gradually increased, so that the operation can be performed according to the outside temperature.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a block diagram of the control device 10 of the refrigerator of this embodiment.

Reference numeral 12 is a compressor provided in the machine room of the refrigerator.

Reference numeral 14 is an outside air temperature detection sensor for detecting the outside air temperature T outside the refrigerator.

Reference numeral 16 is a cooling fan for cooling the temperature of the compressor and the like inside the machine chamber.

Reference numeral 18 is a heater for compensating the temperature inside the refrigerator provided in the rear part of the inner box of the refrigerating compartment.

Reference numeral 20 is an AC power supply that supplies electric power to the cooling fan 16 and the heater 18.

Reference numeral 22 is a transformer, the AC power source 20 is connected to the primary side, and the cooling fan 16 and the heater 18 are connected in parallel to the secondary side.

Reference numeral 24 is a switch composed of a photo coupler for turning on / off the cooling fan 16 and the heater 18, respectively.

Reference numeral 26 is a microcomputer, which opens and closes the switches 28 and 30 of the switch 24 according to the temperature detected by the outside air temperature detection sensor 14 and according to the ON / OFF state of the compressor 12.

The operating state of the refrigerator control device 10 having the above-described configuration will be described (see FIG. 3).

The microcomputer 26 enables the cooling fan 16 when the compressor 12 is in the ON state, and also enables the heater 18 when the compressor 12 is in the OFF state. This prevents the cooling fan 16 and the heater 18 from operating at the same time.

The operating states of the compressor 12, the cooling fan 16 and the heater 18 will be described based on the table of FIG.

The condition for operating the heater 18 is that the compressor 12 is off.
In this state, when the outside air temperature T detected by the outside air temperature detection sensor 14 is T ≦ 5 ° C., the heater 18 is continuously operated. In the case of 5 ° C. <T ≦ 15 ° C., the operation is performed for 9 minutes, stopped for 3 minutes, then operated for 9 minutes, and thereafter, this state is repeated. Outside temperature T is 15 ° C <T ≤
In the case of 20 ° C, the state of operation and stop is repeated every 3 minutes. When 20 ° C. <T ≦ 25 ° C., the heater 18 is operated for 3 minutes, then stopped for 9 minutes, then operated for another 3 minutes, and then stopped for 9 minutes. When the outside air temperature T is T> 25 ° C., the heater 18 is not operated.

The condition for operating the cooling fan 16 is that the compressor 12
In the ON state, when the outside air temperature T is 25 ° C. ≦ T, the operation is continued. When the outside air temperature T is 15 ° C. <T <25 ° C., the operation and the stop are alternately performed every 3 minutes. Furthermore, the outside temperature T is T
No operation is performed if ≤15 ° C.

As described above, with the control device 10, the internal temperature of the refrigerator can be changed well according to the outside air temperature T, and the heater 18 and the cooling fan 16 are not operated at the same time. Therefore, as shown in FIG. 2, the transformer 22 can be transformed, and the capacity of the transformer 22 can be reduced. Furthermore, the control device 10 operates in an intermittent motion even when the heater 18 and the cooling fan 16 are operating, so that low noise and low power consumption can be achieved. Further, although the outside air temperature is controlled in multiple stages, a plurality of heaters and a plurality of switches are not required.

In the above embodiment, the cooling fan 16 provided inside the machine room has been described, but instead of this, the cooling fan in the refrigerator can be similarly controlled. Further, the heater 18 is not limited to the chamber temperature compensating heater, and similar control can be performed with a dew condensation preventing heater or a damper freeze preventing heater.

[Advantages of the Invention] In the refrigerator control device having the above configuration, the cooling fan and the heater do not operate at the same time, and therefore the transformer provided in the cooling fan and the heater can be made small.

The cooling fan and the heater can be controlled in multiple stages according to the outside air temperature detected by the outside air temperature detection sensor, and since the cooling fan and the heater are performing intermittent motion, low power consumption and low noise can be achieved. .

Further, although the outside air temperature is controlled in multiple stages, a plurality of heaters and a plurality of switches are not required.

[Brief description of the drawings]

FIG. 1 is a block diagram of a refrigerator control device of the present invention, FIG. 2 is a block diagram of a refrigerator control device showing an embodiment of the present invention, and FIG. 3 is a compressor, a heater, and It is a table which shows the operating state of a cooling fan. [Explanation of Codes] 1 ... Compressor 2 ... Outside temperature detection sensor 3 ... Cooling fan 4 ... Heater 5 ... Transformer 6 ... Control device

Claims (1)

(57) [Claims] 1. A compressor provided in a machine room of a refrigerator, an outside air temperature detection sensor for detecting the temperature outside the refrigerator, a cooling fan provided in the machine room, a heater for compensating the outside air temperature, and a cooling fan. The transformer that supplies electric power from the power source to the heater and the cooling fan can be intermittently moved in a time-sharing manner for a fixed time when the compressor is operating, and the operating time of the cooling fan increases as the outside temperature detected by the outside temperature detection sensor increases. A control device that makes the heater stepwise longer and allows the heater to intermittently move in a time-division manner for a fixed time when the compressor is stopped so that the operating time of the heater becomes stepwise longer as the outside air temperature detected by the outside air temperature detection sensor becomes lower. A refrigerator control device characterized in that