JPH07270027A - Refrigeration control device for refrigerator - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a refrigerating control device for a refrigerator having a forced refrigerating means, which is capable of continuously cooling even after the forced freezing is completed. [Structure] The refrigeration controller has a microcomputer that stops the compressor and rotates only the E fan for a predetermined time in step 9 after the forced refrigeration is completed in step 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator / freezer.

[0002]

2. Description of the Related Art FIG. 5 is a vertical sectional view of a refrigerator-freezer 1. The refrigerator-freezer 1 is provided with a refrigerator compartment 2, a freezer compartment 4, and a vegetable compartment 6 from the top. On the back of the freezer compartment 4,
A fan (hereinafter, referred to as an E fan) 12 for circulating cooling air in the refrigerator, a defrost sensor 16, and an evaporator 18 are provided, and a compressor 22 and a machine room are provided in a machine room 8 on the back side of the vegetable room 6. Eight air cooling fans 20 are provided.

A freezer sensor (hereinafter, referred to as an F sensor) for detecting the temperature inside the freezer compartment 4 is also provided.
26 are provided.

Further, a control board 28 is provided on the upper rear surface of the refrigerating compartment 2, and an operation board 30 for operating the control board 28 is provided on the front surface.

In the conventional refrigerator / freezer 1 as described above, in order to shorten the ice making time and the freezing time in the freezer compartment 4, the compressor 22 and the E fan 12 are forced to operate regardless of the temperature detected by the F sensor 26. Forced refrigeration means for operating the electric motor is provided.

When the forced refrigeration means finishes the forced refrigeration, the temperature detected by the F sensor 26 reaches the OFF temperature due to cooling, so that the compressor 2
2 and the E fan 12 are stopped in synchronization with each other, so that the inside air is not blown.

[0007]

However, with such a control method, there is no problem when the ice making or freezing is completed during the forced freezing, but the unfrozen state at the end of the forced freezing. In this case, since the compressor 22 and the E fan 12 are stopped even though the subsequent cooling is required, there is a problem that there is no cooling time and ice making and freezing cannot be performed.

In view of the above problems, the present invention provides a refrigerating control device for a refrigerator that can continue cooling even after completion of forced freezing.

[0009]

A refrigeration control device for a refrigerator according to claim 1 of the present invention is a refrigerator having a forced refrigeration means, wherein the compressor is stopped after the forced refrigeration by the forced refrigeration means is finished, and only an E fan is provided. It has a control means for rotating the.

According to a second aspect of the present invention, there is provided a refrigeration control device for a refrigerator having a forced refrigeration means, in which the E fan is continuously operated after the forced refrigeration means finishes the forced refrigeration until the number of operating times of the compressor reaches a predetermined number. It has a control means for rotating it.

[0011]

In the refrigeration control device for a refrigerator according to claim 1, the control means, after the forced freezing by the forced freezing means is completed,
The compressor is stopped and only the E fan is rotated for a predetermined time. Therefore, even after the forced freezing is completed, the air is blown inside the refrigerator, and the cooling is continuously performed.

In the refrigerating control device for a refrigerator according to the second aspect, the control means, after the forced freezing by the forced freezing means is completed,
Until the number of compressor operations reaches the specified number, E
Since the fan is continuously rotated, air is blown inside the warehouse during that time, and cooling is continuously performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The structure of the refrigerator-freezer 1 is the same as that shown in FIG.

FIG. 1 is a circuit diagram of a refrigeration control apparatus 10 of this embodiment, and FIG. 2 is a flow chart of a first control method in the control.

First, a circuit diagram of the refrigeration control apparatus 10 will be described with reference to FIG.

Reference numeral 42 is a relay switch for operating the compressor 22. This relay switch 4
2 is turned on when a signal is input to the base terminal of the switching transistor 44.

Reference numeral 46 is a relay switch for operating the E fan 12. This relay switch 46
Also, when a signal is input to the base terminal of the switching transistor 48, it is turned on.

Reference numeral 50 is a microcomputer which is the main control unit of the refrigeration control apparatus 10. The base terminal of the transistor 44 is connected to the output terminal of the microcomputer 50 through the resistor 52, and the base terminal of the transistor 48 is also connected through the resistor 54. Then, the relay switch 42 and the relay switch 46 are turned ON / OFF by the output signal from the microcomputer 50. Further, a forced freezing timer, which will be described later, and a delay timer are built in the microcomputer 50.

Reference numeral 56 is a thermistor of the F sensor 26, and a DC voltage Vcc is connected to one end thereof.
The other end is grounded via the resistor 58 and is also connected to the-side input terminal of the comparator 60. The positive side input terminal of the comparator 60 has resistors 62 and 64.
Is connected to the voltage dividing circuit. Comparator 60
The output terminal of is connected to the input terminal of the microcomputer 50 through the NOT circuit 66. A feedback resistor 68 is connected between the output terminal of the comparator 60 and the-side input terminal. Then, according to the temperature detected by the F sensor 26,
The resistance of the thermistor 56 changes and a signal is output from the comparator 60 to the microcomputer 50.

Reference numeral 70 denotes a forced freezing switch provided on the operation board 30. One end of the forced refrigeration switch 70 is grounded, and the other end is connected to the DC power supply Vcc through the resistor 72 and the input terminal of the Schmitt circuit 74.

Reference numeral 76 is a D-type flip-flop, the output terminal of the Schmitt circuit 74 is connected to the clock terminal thereof. A NOT circuit 78 is connected to the Q terminal, and the NOT circuit 78 is connected to the input terminal of the microcomputer 50. The inverting Q terminal is connected to the D terminal. When the forced freezing switch 70 is turned on, the Schmitt circuit 74, the D-type flip-flop 76,
A signal is output to the microcomputer 50 via the NOT circuit 78.

Reference numeral 80 denotes a pulse generating circuit for resetting when the power is turned on, which includes a Zener diode 82, two-stage switching transistors 84 and 86, a resistor 88 and a capacitor 90. A delay pulse is generated by utilizing the fact that this circuit 80 and the power source + Vcc rise gently. That is, immediately after the power is turned on, the base current does not flow in the transistor 84 and the transistor 8 is turned off.
Base current flows through 6 and is turned on. When the power supply exceeds the Zener voltage of Zener diode 82, transistor 8
4 is ON and the transistor 86 is OFF. At this point, charging of the capacitor 90 is started through the resistor 88,
A pulse is output after charging is completed. The pulse output is output to the inversion reset terminal of the microcomputer 50 and the D-type flip-flop 76.

The control state of the refrigeration control apparatus 10 having the above structure will be described with reference to the flowchart of FIG.

When the power is turned on, the reset circuit 80 resets the microcomputer 50 and the D-type flip-flop 76.

In step 1, it is judged whether or not the forced refrigeration switch (referred to as QF switch in the figure) 70 is in the ON state. If it is in the OFF state, the normal cooling device is controlled, and if it is in the ON state, the step is performed. Go to 2.

In step 2, the forced freezing timer (QF timer in the figure) starts counting, in step 3 the forced freezing timer is incremented, and in step 4, the compressor 22 and the E fan 12 are operated. This starts forced freezing.

In step 5, it is determined whether the forced freezing timer has counted up. This time is 90
Set to minutes. When not counting up, the operations of steps 3 to 4 are continued, and when counting up, the process proceeds to step 6. This ends the forced freezing.

In step 6, the forced freezing timer is reset, and in step 7, the delay timer starts counting.

In step 8, the delay timer is incremented, only the compressor 22 is stopped in step 9, and the E fan 12 continues to operate.

In step 10, it is determined whether the delay timer has counted up. This time is set to 2 hours. That is, if the time does not reach 2 hours, the operations of steps 8 to 9 are continued, and if the time is counted up, the process proceeds to step 11. That is, even if the forced refrigeration is completed in this state, only the E fan 12 is rotated, and it is possible to continue the internal air blowing and continue the cooling.

In step 11, the delay timer is reset, in step 12, the E fan 12 is stopped, and normal control is started.

FIG. 3 is a time chart of the control state in the refrigeration control device. In this figure, the solid line shows the operating state of this embodiment, and the dotted line shows the conventional operating state.

According to this time chart, when only the E fan 12 is rotated after the forced refrigeration is performed for 90 minutes, the air in the refrigerator is sucked into the evaporator 18 and heat is exchanged.
Then, the temperature of the evaporator 18 rises, the temperature detected by the F sensor 26 rises faster, the OFF time is shortened, and as a result, the operating rate rises. Therefore, the ice making time and the freezing time can be shortened. On the other hand, if the E fan 12 is also stopped at the same time as in the conventional case, the F sensor 26
The rise in the detected temperature is delayed and the operating rate does not rise.

FIG. 4 is a flow chart showing the second control method of the refrigeration control apparatus 10.

The control state will be described below with reference to this flowchart. Note that steps 1 to 6 are the same as those in the first control method, and will be omitted. A counter (hereinafter, referred to as a C counter) that counts the number of times the compressor 22 is operated in this embodiment is built in the microcomputer 50.

When the forced refrigeration is completed and the forced refrigeration timer is reset, the C counter is reset in step 7.

In step 8, only the compressor 22 is stopped and the E fan 12 continues to rotate.

At step 9, the F sensor 26 is turned on.
It is determined whether or not the state is reached. If it is not turned on, the process returns to step 8, and if it is turned on, the process proceeds to step 10. That is, in step 10 which detects that the forced freezing ends and the room temperature of the freezer compartment 4 starts to rise, the C counter is incremented once and the process proceeds to step 11.

In step 11, since the room temperature of the freezer compartment 4 has risen, the compressor 22 is operated and step 1
Go to 2.

In step 12, the compressor 22
The temperature of the freezer compartment 4 is lowered by the operation of
If is turned off, the process proceeds to step 13, and if it is turned on, the process returns to step 11.

In step 13, since the room temperature of the freezer compartment 4 has dropped, the compressor 22 is stopped and step 1
Go to 4.

In step 14, it is judged whether or not the C counter has reached 3 times, and if it does not reach 3 times, the process returns to step 9 and if it does 3 times, the process proceeds to step 15. That is, in this step, it is determined whether the compressor 22 has been operated three times.

In step 15, the E fan 12 which has been continuously rotating until now is stopped, and normal control is started.

Even in the above control state, after the forced freezing is completed, the E fan 12 is continuously rotated and the interior cooling is continued until the compressor is operated three times.

In the above embodiment, the count number of the C counter is three, but the number is not limited to this and may be one or more.

[0046]

According to the refrigeration control device for a refrigerator of claim 1, since only the fan is rotated for a predetermined time after the forced refrigeration is finished, the air cooled by the evaporator can be circulated to continue the cooling. .

According to the refrigeration control device for a refrigerator of claim 2, after the forced refrigeration is finished, the fan is continuously rotated until the number of operating times of the compressor reaches a predetermined number, so that the air cooled by the evaporator is Can be circulated and cooling can be continued.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a refrigeration control apparatus showing an embodiment of the present invention.

FIG. 2 is a first control flowchart in the refrigeration control device.

FIG. 3 is a time chart in the refrigeration control device.

FIG. 4 is a second control flowchart in the refrigeration control device.

FIG. 5 is a vertical sectional view of a refrigerator-freezer.

[Explanation of symbols]

 1 Refrigerator / Refrigerator 4 Refrigerator 10 Refrigerating Controller 12 Fan 22 Compressor 26 F Sensor 50 Microcomputer

Claims (2)

[Claims] 1. A refrigerator having forced refrigeration means for forcibly operating a compressor and a fan for circulating cooling air in the refrigerator regardless of the temperature detected by a freezer sensor in the freezing compartment. A freezing control device for a refrigerator, characterized in that it has control means for stopping the compressor and rotating only the fan for a predetermined time after the forced freezing is completed. 2. A refrigerator having forced freezing means for forcibly operating a compressor and a fan for circulating cooling air in the refrigerator regardless of the temperature detected by a freezer sensor in the freezing room. The freezing control device for a refrigerator, comprising: a control means for continuously rotating the fan until the number of operating times of the compressor reaches a predetermined number after completion of forced freezing by.