JPH0610575B2 - refrigerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a refrigerator for heating and controlling the air in a cold room according to the temperature of the cold room.

[Conventional technology]

FIG. 4 shows a conventional example of a refrigerator. In the figure, 1 is a freezer-refrigerator main body, 2 is a freezer compartment provided in the upper front of the refrigerator, 3 is a freezer compartment temperature sensor for detecting the temperature of the freezer compartment 4, and 4 is a cooling compartment provided behind the freezer compartment 2. Reference numeral 5 denotes a cool air forced circulation fan (hereinafter referred to as fan) provided in the upper part of the cooling chamber, 6 denotes a fan motor for driving the fan 5, 7 denotes directly below the freezing chamber 2 and the cooling chamber 4, and has a refrigerating chamber. 7
r, a chilled room 7c and a vegetable room 7y, 8 is an electric damper provided in a duct 9 that connects the cold room 7 and the cooling room 4, 10 is provided in the duct 9, and the refrigerating room 7
Refrigerating room temperature sensor for detecting the temperature of r, 11 is a cold room 7
, A heater (heating body) for heating the air of the freezing chamber 12, a variable resistor (not shown) for setting the temperature of the freezing chamber 2 attached to the door of the freezing chamber 2, a variable resistor (not shown) for setting the temperature of the refrigerating chamber 2. ), An operation panel having an outside air temperature sensor (not shown) for detecting the temperature of the outside air, and 13 together with the freezing room temperature sensor 3, the refrigerating room temperature sensor 10, the outside air temperature sensor,
Freezing room temperature, cold storage room temperature, temperature detection unit for detecting the outside air temperature, 14 according to the detected freezing room temperature, cold storage room temperature, outside air temperature, via the drive unit 15, respectively,
Compressor 16, fan motor 6, electric damper 8,
It is a microcomputer that controls ON / OFF of the heater 11.

[Problems to be Solved by the Invention]

The conventional refrigerator has an outside air temperature sensor and a temperature detection unit 13.
The heater 11 is turned on / off by the microcomputer 14 via the drive unit 15 according to the outside air temperature detected by
Since it is configured to be turned off, the refrigerating compartment 7r becomes the refrigerating compartment 7r.
Even if the temperature of r falls below the predetermined temperature, the air in the refrigerating compartment 7r may not be heated by the heater 11. In this case, the refrigerating compartment 7r is kept in a supercooled state for a long time, and There was a problem of freezing. When the temperature in the refrigerating room is not lower than the planned temperature, the heater 1 is turned on.
In this case, there is a problem that the air in the refrigerating compartment 7r is heated and the temperature of the refrigerating compartment 7r rises abnormally, which damages food and the like in the refrigerating compartment.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to appropriately control the temperature of a cold storage chamber.

[Means for solving problems]

In this invention, in order to achieve the above object, the refrigerator is configured as follows.

A cold room temperature detecting means for detecting the cold room temperature, a heating body for heating the air in the cold room, and a time measuring means for measuring the time after the cold room temperature falls below a predetermined first temperature, The first heating control means is turned on at the time when the time measured by the time measuring means has passed the scheduled time, and the first heating is performed at the time when the temperature of the cold room reaches the third temperature which is higher than the second temperature. The second heating control means for turning off the control means, and the heating body being turned on at the same time when the heating means is turned on by the second heating control means, the temperature of the cold room becomes equal to or higher than the second temperature higher than the first temperature. And a first heating control means for turning off the heating body at a time point, and the first heating control means turns on the heating body immediately when the temperature of the cold room becomes equal to or lower than a first temperature. .

[Action]

In the refrigerator according to the present invention, the second heating control unit turns on the first heating control unit when the time measured by the time counting unit has passed the scheduled time, and then the first heating control unit turns on the heating element. It is turned on when the cold room temperature becomes the first temperature or lower, and the second temperature higher than the first temperature is set.
Turns off when the temperature rises above. Since the first heating control means is turned off by the second heating control means at the time when the temperature of the cold storage room becomes equal to or higher than the third temperature which is higher than the second temperature, the temperature of the cold storage room is appropriately controlled.

〔Example〕

FIG. 1 shows an embodiment of the present invention. This is an example of controlling the temperature of the refrigerating compartment, which is a component of the cold keeping compartment. In the figure, 1 to 11, 7r, 7c, 7y and 13 to 16 are the fourth
The same parts as in the figure are shown. The refrigerating compartment temperature sensor 10 and the temperature detecting unit 13 constitute a cold compartment temperature detecting means for detecting the temperature of the refrigerating compartment 7r. Reference numeral 17 denotes an operation panel attached to the door of the freezer compartment 2, which has a variable resistor for setting the temperature of the freezer compartment 2 and a variable resistor for setting the temperature of the refrigerating compartment 7r. Reference numeral 18 denotes a microcomputer (hereinafter, abbreviated as a microcomputer) including a timer (time measuring means).
The time after the temperature of the refrigerating room 7r becomes equal to or lower than the predetermined first temperature T1 is measured. Further, the microcomputer 18 constitutes the first heating control means C and the second heating control means together with the drive section 15, and the first heating control means C detects the heater 11 of the refrigerating chamber 7r detected. Turns on when the temperature is equal to or lower than the first temperature T1 set in advance, and the second temperature T2
When it is (> T1) or more, it is turned off, and the second heating control means is
The first heating control means C is turned on when the time measured by the timer has passed the scheduled time, and turned off when the temperature of the refrigerating chamber 7r becomes equal to or higher than the third temperature T3 (> T2). It also resets the timer. The temperature Ta of the refrigerating chamber 7r for closing the damper 8 is Ta.
Between the first temperature T1 and the second temperature T2,
The relationship of <Ta <T2 is satisfied.

Next, the operation will be described based on the operation flowchart shown in FIG.

When the temperature of the refrigerator compartment 7r becomes lower than the first temperature T1 (STE
P-1), the timer in the microcomputer 18 is activated (STEP-2), and thereafter, when this timer continues clocking and the time preset in the timer elapses (STEP-3), the first heating control Means C
Is turned on (STEP-4), and the heater 11 heats the air in the refrigerating chamber 7r. When the detected temperature of the refrigerating compartment reaches the second temperature T2 (STEP-5), the heater 11 is turned off by the first heating control means C (STEP-6), and when it becomes lower than the first temperature T1 (STEP-5). -8), it is turned on immediately (STEP-4), and this operation is repeated.

On the other hand, if the temperature of the refrigerator compartment 7r exceeds the second temperature T2 (S
TEP-5), the heater is turned off (STEP-6), but even if the heater is turned off, if the temperature of the refrigerating compartment 7r continues to rise and exceeds the third temperature T3 (STEP-7), The first heating control means C is turned off by the second heating control means, and at the same time, the timer is reset (STEP-9).

After that, when the temperature of the refrigerator compartment 7r becomes lower than the first temperature
(STEP-1), the timer in the microcomputer 18 is activated (STEP-
2) After that, the above operation is repeated.

In this way, when the temperature of the refrigerating chamber 7r decreases from the temperature (T3 or higher) higher than the desired temperature range (T1 to T2) and reaches the planned temperature (T1), the scheduled time elapses. Since the heater 11 does not operate, the temperature of the stored product such as food in the refrigerating chamber 7r drops to almost the desired temperature during this time. After that, the limit T1, of the desired temperature range,
At T2, the heater 11 immediately turns on and off. Therefore, the temperature of the food or the like in the refrigerator compartment 7r is properly controlled.

FIG. 3 shows the temperature of the refrigerator compartment 7r and ON / OF of the heater 11.
The F timing and the ON / OFF timing of the first heating control means are shown together with the opening / closing timing of the electric damper 8.

In addition, in this embodiment, among the chambers constituting the cold storage chamber 7,
Although the temperature control of the refrigerating chamber 7r has been described, it goes without saying that the temperature of the chilled chamber 7c and the like can be controlled based on the detected temperature of each chamber, as in this embodiment.

〔The invention's effect〕

As described above, according to the present invention, the second heating control means causes the second heating control means to control the temperature when the cold room temperature measured by the time measuring means becomes equal to or lower than the predetermined first temperature when the predetermined time elapses. 1 The heating control means is turned on, the heating element is turned on by the first heating control means, and when the second temperature higher than the first temperature is reached, the heating element is turned off and the cold storage chamber temperature is set to the second value. When the temperature reaches the third temperature, which is higher than the temperature,
Since the heating control means is turned off, the supercooling of the cold insulation chamber is detected when a certain time has elapsed since the temperature became lower than the first temperature, and the temperature compensation by the heating element is performed only during the supercooling. There is an effect that power consumption can be reduced and the temperature of the cold storage room can be appropriately controlled.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an operation flowchart, FIG. 3 is a refrigerating chamber temperature and heater ON / OFF timing, and first heating control means ON / OFF.
FIG. 4 is a diagram showing OFF timing and damper opening / closing timing, and FIG. 4 is a diagram showing a conventional example of a refrigerator. In the figure, 10 is a refrigerator temperature sensor, 11 is a heater,
13 is a temperature detection part, 15 is a drive part, 18 is a microcomputer, and C is a first heating control means. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A cold room temperature detecting means for detecting a cold room temperature, a heating element for heating air in the cold room, and a time period after the cold room temperature falls below a predetermined first temperature. And the first heating control means is turned on when the time measured by this time measuring means and the time measured by this time measuring means have passed the scheduled time.
However, when the cold room temperature becomes equal to or higher than the third temperature which is higher than the second temperature, the second heating control means for turning off the first heating control means and the second heating control means for turning it on. At the same time, the heating element is turned on, and the heating element is turned off when the temperature of the cold room reaches a second temperature higher than the first temperature.
A refrigerator characterized in that the heating control means turns on the heating body immediately when the temperature of the cold room becomes equal to or lower than a first temperature.