JPS613972A - Controller for operation of blower for agitating cold air inrefrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention provides a cooler and a blower for agitating cold air in the refrigerator main body to cool the freezer compartment and the refrigerator compartment with forced ventilation, and also sets frost to form on the cooler. This invention relates to a refrigerator having a defrosting device that defrosts the air every hour, and in particular to a cold air stirring blower operation control device that controls the rotation speed of the cold air stirring blower so as to properly circulate the cold air after defrosting. .

Conventional configuration and its problems In general, when defrosting a refrigerator that has a defrosting device that defrosts the frost that forms on the cooler at set intervals, the electric compressor and cold air agitation blower are stopped during defrosting. Then, the defrosting heater provided in the cooler is energized, and the heat is used to defrost the frost that has formed on the cooler.

When defrosting is completed and the temperature of the cooler rises to the set temperature, the defrost completion detector operates, turns off the power to the defrost heater, and operates the electric compressor and cold air stirring blower to start cooling. It looks like this. However, the temperature of the cooler at the end of defrosting generally rises to around 40° C. because it is heated by a defrosting heater to ensure complete defrosting. Furthermore, the temperature in the freezer room is too high to store frozen foods, which is a bad condition. However, under these conditions, the electric compressor and the cold air agitation blower are started, and the cold air agitation blower is operated at the rated rotational speed, so there is no need to send warm air from the cooler, whose temperature has risen, into the freezer compartment. , the temperature of the freezer compartment will increase, causing frozen foods, etc.
This method has the drawback that the temperature of the stored food temporarily increases, which has an adverse effect on the food.

Purpose of the Invention Therefore, the present invention starts operation of the rotation speed of a cold air stirring fan after defrosting is completed from a low speed according to the temperature of the freezer compartment, eliminates circulation of warm air in the freezer compartment, and controls the rotation speed so as not to adversely affect foods, etc. The purpose of the present invention is to provide an operation control device for a blower for stirring cold air in a refrigerator.

Structure of the Invention In order to achieve this object, the present invention starts the rotation speed of the cold air agitation blower from a low speed according to the temperature of the freezer compartment in the next cooling operation after the end of defrosting, and then restarts the operation after the end of defrosting. A timer that starts and stops operation after a certain period of time gradually increases the rotation speed of the cold air agitation blower according to the temperature of the freezer compartment until the timer stops operating, and then returns to the rated rotation speed after the timer stops. Description of Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings. 1st
In the figure, 1 is the main body of the refrigerator, and a partition wall 2 is provided inside the main body 1 to partition the inside of the main body 1 into a freezing compartment 3 and a refrigerating compartment 4. The partition wall 2 is formed with a cooling compartment α in which a cooler 5 and a blower 6 for stirring cold air are installed.

The cooler 6 is provided with a defrost heater 7 that heats the cooler 5 during defrosting. In addition, a drain pan 8 is located below the cooler 6.
A drain pan heater 9 is provided on the back side of the drain pan 8 to heat the drain pan 8 during defrosting. A drain port 10 is provided at the lowest position of the drain pan 8, and the drain D10 is connected to a drain pipe 11 from the drain port 10 to the inside of the refrigerator compartment 4, and the drain pipe 11 connects from the refrigerator compartment 4 to the outside of the main body 1. The defrosting water defrosted by the cooler 6 is drained to a predetermined position outside the refrigerator main body 1.

A ventilation duct 15 communicating with the ventilation ports 13, 14 of the freezing compartment 3 and the refrigerator compartment 4 is provided at the rear of the compartment α, and the cooling air of the cooling compartment α is supplied to the freezing compartment 3 and the refrigerator compartment 4. Both rooms 3 and 4 are cooled by forced ventilation.

Reference numeral 1e denotes a damper thermostat provided in the air outlet 14, which adjusts the amount of cooling air ventilated into the refrigerator compartment 4 and controls the interior of the refrigerator compartment 4 to a predetermined temperature. 17 is a thermistor (also referred to as a temperature detection element) that detects the internal temperature of the freezer compartment 3.

Next, the circuit shown in FIG. 2 will be explained.

Reference numeral 18 denotes a temperature detection circuit for the freezer compartment 3, which is composed of a thermistor 17; and a comparison circuit 19. The output A of the temperature detection circuit 18 is connected to the logic circuit 2001.

The other input of the logic circuit 20 is connected to the output C of the first timer 24. Output B of logic circuit 2o is driver circuit 2
It is connected to 10 inputs and is configured to send a signal to turn on/off the relay 22.

The first timer 24 is configured to add up the operating time of the electric compressor 23. The output C of the first timer 24 is connected to the input of the driver circuit 25, and the output connects the relay 26 to 0.
It is configured to send a signal that is N10FF. A defrosting end detector 26 is connected to the reset terminal of the first timer 24. 27 is the second timer and the input is the first timer 24
The output C of the second timer 27 is connected to the manual power of the rotation speed control circuit 2901. Reference numeral 28 denotes an amplifier circuit, the input of which is connected to the thermistor 17, and the output E of which is connected to one input of the rotation speed control circuit 29.

One output of the rotation speed control circuit 29 is connected to the output B of the logic circuit 2o.

Electric compressor 23 is connected to a power source via relay 22. The cold air stirring blower 6 is connected to a power source via a rotation speed control circuit 29.

The defrosting heater and the drain pan heater 9 are connected in parallel, connected in series with the relay 26, and connected to the power source.

Next, the operation of the circuit configured as described above will be explained. When the temperature inside the freezer compartment 3 is high, the output A of the temperature detection circuit 18 outputs a high signal (hereinafter simply referred to as H''') according to the thermistor 17 placed in the freezer compartment 3, and when the temperature inside the freezer compartment 3 is low, the output A is output A. outputs a Low signal (hereinafter simply referred to as "L"'). When the output A of the temperature detection circuit 18 becomes H", one output of the logic circuit 20 becomes HI), and the individual input is the first timer 24.
The output C of the logic circuit 2o is "L"', and the output B of the logic circuit 2o is "L"'.
The relay 22 is turned ON and L through the driver circuit 21, and the electric piezoelectric machine starts operating.

At this time, the rotation speed control circuit 29 outputs the output B of the logic circuit 20 @
l(b, the output of the second timer 27 is 11 i,', therefore, regardless of the output E of the amplifier circuit 28, (.,
, 1j□Awed&□, Yoga, Yu, 6e Stirring blower 6
, and the cold air stirring blower 6 operates.

When the temperature inside the freezer compartment 3 becomes low due to cooling operation, the temperature detection circuit 1
The output A of the logic circuit 20 is "L" and the input of the logic circuit 20 is "L".
', the output B becomes L''.

When the output B of the logic circuit 13 becomes L'', the relay 22 turns OFF.
F, and the electric compressor 23 stops operating.

At this time, the one-rotation speed control circuit 29 operates to stop the operation of the cold air stirring blower 6 based on the output B of the logic circuit 20 being a L '. Thereafter, this action is repeated to operate and stop the electric compressor 23 and the cold air agitation blower 6 for cooling operation and to stop the operation.

While the electric compressor 23 is operating, the output B of the logic circuit 20 is “H”.
'', the first timer 24 operates and integrates the operating time of the electric compressor 23. Also, the output P of the logic circuit 20
is L″′, that is, when the electric compressor 23 is stopped, the first
The operation of timer 24 is stopped.

By repeating the above operation, the output C of the first timer 24 becomes H1.
’ is output, the relay 26 is output via the driver circuit 25.
ON L defrost heater 7 and drain heater 9 are connected to the power supply and start defrosting operation.

When the output C of the first timer 24 becomes 'H', the logic circuit 20
01 human power becomes "H", the output B of the logic circuit 20 is held at "L" regardless of the output of the output A of the temperature detection circuit 18, and the relay 22 is set to QFF via the driver circuit 21.
It remains as it is. Also, the rotation speed control circuit 29 is a logic circuit 2.
The output B of 0 is held at 'L'', and the cold air stirring blower 6 is held in a state where the operation is stopped. When the defrosting of the cooler 5 progresses by the defrosting heater 7 and drain pan heater 9, the end of defrosting is detected. The end of the pig box is detected by the device 26, a reset signal is sent to the first timer 24, and the output C of the first timer 24 becomes +
v Changes from H++ to “L”. When the output C of the first timer 24 becomes L1', the logic circuit 2o follows the output A of the temperature detection circuit 18, sets the output B to n Hu, and the electric compressor 23 operates as described above. The second timer 27 starts operating in response to a signal in which the output C of the first timer 24 changes from "H" to II L It. The second timer 27- operates to stop the operation after a certain period of time. Second timer 27
At the same time as starting the operation, the output becomes H'9, the manual power of the rotation speed control circuit 29 is H'', and the output of the logic circuit 20 is B75f''l H', so the rotation speed control circuit 2
9 operates to vary the rotational speed according to the level of the output E of the amplifier circuit 28. As mentioned above, when the electric compressor 23 starts operating after defrosting, the temperature inside the freezer compartment 3 is so high that the signal from the thermistor 17 is amplified by the amplifier circuit 28, and the output E is As shown in Figure 3, it is at level 11. The rotational speed control circuit 29 receives this level 11, controls the rotational speed to nl, and operates the cold air stirring blower 6. As the cooling operation progresses, the temperature in the freezer compartment 3 gradually decreases.
The output E of 8 changes up to level 12.

Level I! 2, the rotation speed control circuit 29 receives this level 12 and controls the rotation speed to n2, and the cold air stirring blower 8 operates at the rotation speed n 2 (n 2 (n 1).Similarly, the amplifier circuit When the output E of 28 reaches level 13, the cold air stirring blower 16 has a rotation speed n a (n 3).
n 2 ) n 1). In this manner, the rotational speed of the cold air stirring blower 160 is gradually changed from low speed to high speed according to the thermistor 17, thereby performing a cooling operation after defrosting.

As the operation of the second timer 27 progresses and a certain period of time elapses, the output of the second timer 27 changes from "H" to "L" and K.The first rotation speed control circuit 29 operates the cold air stirring blower at the rated rotation speed regardless of the thermistor 17. Have the driver perform step 6.

Effects of the Invention As is clear from the above description, the present invention operates a timer after defrosting is completed, and while this timer is operating, the rotation speed of the cold air stirring blower is operated at a low speed according to the temperature of the freezer compartment.
゛The rotation speed of the cold air agitation blower is gradually increased and returned to the rated speed after the timer stops, so if the temperature of cooler A1 or the freezer compartment temperature rises during cooling operation after defrosting, This prevents high-temperature air from being circulated during storage, and allows constant circulation of cold air after it has cooled sufficiently, resulting in the effect that preserved foods can be stored well.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of a refrigerator showing an embodiment of the present invention;
FIG. 2 is an electric circuit diagram of the same, and FIG. 3 is a time chart of the same. 6...Blower for stirring cold air, 7...Defrosting heater, 17...Thermistor, 27...
・Second timer, 28... Amplifier circuit, 29...
...Rotation speed control circuit.

Claims (1)

[Claims] An electric compressor of a cooling system for cooling the inside of the refrigerator, a cooler, a cold air agitation blower for forcibly circulating cold air to a freezer compartment and a refrigerator compartment in the refrigerator, and a temperature detection circuit that detects the temperature of the freezer compartment; a first timer for accumulating the operating time of the electric compressor; a defrosting heater for defrosting the cooler; a rotational speed control circuit for switching the rotational speed of the cold air agitation blower; and an operation after the defrosting heater stops energizing. and a second timer that starts operating upon activation and stops operating after a certain period of time, and while the second timer is operating after defrosting is completed, the rotation speed control circuit is operated by the temperature detection circuit of the freezer compartment, The rotation speed of the cold air stirring blower is switched and operated depending on the temperature of the freezing compartment, and after the second timer stops operating, the operation of the rotation speed control circuit is stopped, and the cold air stirring blower is returned to normal operation. A blower operation control device for stirring cold air in refrigerators.