JPS582573A - Controller for defrosting of fan type freezing refrigerator - 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 The present invention provides a function for rapidly cooling food stored in a freezer by forcing a compressor to operate continuously (hereinafter referred to as a "quick freezing function"), or a function for forcibly operating a fan motor for cold air circulation. The present invention relates to a defrosting control device for a fan-type refrigerator-freezer, which has at least one function of rapidly cooling food, etc. stored in the refrigerator by continuous operation (hereinafter referred to as "quick freezing function").

In conventional refrigerator-freezers, the operating time of the compressor motor is accumulated based on the time when the previous defrosting operation was completed.
When the accumulated compressor motor operating time reaches a certain time, the defrosting heater is energized to start the defrosting operation. ``If a conventional defrost control device is installed in a fan-type refrigerator-freezer that has at least one of the quick freezing function or the quick cooling function, the defrosting operation will start while the quick freezing operation or quick cooling operation is being performed. In this case, the rapid freezing or cooling operation is interrupted and the defrosting operation is performed, so the temperature of the food, etc. that is being rapidly frozen or cooled may rise and it must be urgently cooled to -. This means that the function of the quick freezing or quick chilling book bundle cannot be fully utilized.

If it is time to start the defrosting operation during the quick freezing or quick cooling paper operation, the start time of the defrosting operation is delayed until the quick freezing or quick cooling operation is completed, so that the quick freezing or quick chilling book stack can be It is conceivable that the defrosting operation could be made more effective, but in this case, the defrosting operation start time would be significantly closer to the original defrosting operation start time than the original defrosting operation start time. If the refrigerator is left in the refrigerator for an extremely long time, the amount of frost on the cooler increases significantly, and the defrosting operation time becomes longer, causing the temperature inside the refrigerator to rise, or complete defrosting may occur. However, there are drawbacks such as some frost remaining and reducing the heat exchange efficiency of the cooler.

In the present invention, when the rapid freezing operation or the rapid cooling operation is set, the rapid freezing operation or the rapid cooling operation is continued without performing the defrosting operation even if the original defrosting operation start time is coincident with the original defrosting operation start time. In addition, if the rapid freezing operation or rapid refrigeration operation continues even after a predetermined period of time has passed from the original defrosting operation start time, the rapid freezing operation or rapid refrigeration operation is temporarily interrupted and the defrosting operation is performed. The operation is started, and after the defrosting operation is completed, the quick freezing operation or the quick refrigeration operation is performed again, and if the quick freezing operation or the quick cooling operation is finished before the predetermined period of time has elapsed, the defrosting operation is started immediately from the point of completion. In this way, the above drawbacks are solved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fan-type refrigerator-freezer equipped with a defrosting control device of the present invention will be described in detail below with reference to the accompanying drawings showing embodiments.

Figure 1 is an electrical wiring diagram of a fan-type refrigerator-freezer, in which a relay contact (Ry8) and a defrosting heater (R3) are connected in series between both terminals of a commercial alternating current power supply (AC), and a relay contact (R3 /l) and the compressor motor (Ll) are connected in series, and then the relay contact (Ry2), cold air circulation fan motor (R2), freezer compartment door switch (SWt), and refrigerator compartment door switch (SW2) are connected in this order. Connected in series. Then, connect the normally closed contact of the relay contact (R3/2) to the connection point between the relay contact (Ryt) and the compressor motor (Ll), and also connect the freezer compartment door switch (SWI).
The refrigerator interior lights (R4) and (R5) are connected to the normally open contacts of the refrigerator compartment door switch (SW2), respectively, and both normally open contacts are connected to each other. Therefore, when switching the relay contact (Ry+), the recomputer motor (Ll)
) and the cold air circulation fan motor (R2), and by switching and operating the relay contact (Ry2), the cold air circulation fan motor (R2) can be driven independently of the drive of the compressor motor (Ll). I can do it.

FIG. 2 is an electrical wiring diagram of the control section, which is the most important aspect of the present invention, and includes a 14-stage binary counter (l 6) Q 7j
(+8), comparator 0, oscillator that repeats high level and low level output at a constant cycle, and NOR game) (
1) (2) (5) (6) (9) and OR gate (3) (
7) α [with] H and AND gate (4) (s) (10
C11) Q-ring (15), inverter Q, switch for quick-freezing set (SW+), switch for quick-refrigeration set (SW4), switch for quick-freezing and quick-refrigeration reset (SW5), Thermostat for detecting the end of defrosting) (
SW6) and an LED (LEDI) that indicates the rapid freezing set status.
), an LED (L'ED2) that indicates the rapid cooling set state, a thermistor ('rH) that detects the temperature in the freezer, a variable resistor (VR) for setting the temperature in the freezer, and a positive pulse of -1. Capacitor (CI) and resistor (R1) for output
The 0 OR gate (3), which is composed of a series circuit with a capacitor (C2) and a resistor (R2), receives a high level signal when the switch (SW4) is turned on, and a high level signal when the switch (SW5) is turned on. high level signal,
A pulse and binary counter (Qlo of 1η) output from a series circuit of a capacitor (C1) and a resistor (Rt)
output as input, output terminal as )(inary counter (17)
! The OOR gate (7) connected to the clear terminal of
High level signal when switch (SWa) is turned on, switch (SWa)
The high level signal when SW5) is turned on, the pulse output from the series circuit of capacitor (C1) and resistor (R1), and the Q9 output of binary counter (16) are input, and the output terminal is connected to Connected to clear terminal.

OR gate 0→ is the pulse output from the series circuit of capacitor (C) and resistor (R1) and thermostat (
When SW6) is turned on, the pulse output from the series circuit of capacitor (C2) and resistor (R2) is input, and the output terminal is connected to the binary counter (one barrel clear terminal).

NOR gates (1) and (2) each connect the output terminal of one NOR gate to the input terminal of the other NOR gate, and the other input terminal of NOR gate (1) has a high level when the switch (SWa) is turned on. Apply a level signal and NOR
The other input terminal of the gate (2) is connected to the OR gate (3).
) is applied so that when the output signal of either NOR gate becomes high level, the output signal of the other NOR gate becomes low level. And the N
The LE is connected in series with the switching transistor (Qt) which is switched ON-OFF by the output signal of the OR gate (2).
D (LEDI) is connected.

NOR gates (5) and (6) each connect the output terminal of one NOR gate to the input terminal of the other NOR gate, and the other input terminal of NOR gate (5) is connected to the high level when the switch (SW4) is turned on. Apply a level signal and NOR
The output terminal of the OR gate (7) is applied to the other input terminal of the gate (6), so that when the output signal of one of the NOR gates becomes a high level, the output signal of the other NOR gate becomes a low level. I am trying to make it so that And the NOR
An LED (L
Eb2) is connected.

AND gate (4) (s) (10 is for inputting the output signal of one oscillator into the clock terminal of the pinary counter η(-(+8)), and the other input terminal of the AND gate (4) The output signal of the NOR gate (2) and a signal indicating the energization state of the relay coil (RY3) are applied to the other input terminal of the AND gate (8).
Output signal of R gate (6) and relay coil (RY3)
A signal indicating the energization state is applied to the AND gate 0.
A signal indicating the energization state to the other input terminal J relay Il (RYI) of No. 1 is applied via an inverter (c).

Comparator 01 connects the connection point between the resistor (R14) and thermistor (TH), which are connected in series, to the comparison input terminal, and also connects the connection point between the resistor (Rts) and the variable resistor (VR), which are connected in series. The connection point of is connected to the reference input terminal,
A relay coil (RYI) is connected in series with a switching transistor (Q4) which is switched ON-OFF by the output signal of the comparator 0, and the output signal of the NOR gate (2) is connected to the switching transistor (Q4). (Q
4) A switching transistor (Q5) which is applied to the base terminal of the switching transistor (Q4) and which is switched between 0N and OFF by the output signal of an OR gate 0 [present] which will be described later is connected in parallel between the pace and emitter terminals of the switching transistor (Q4). are doing.

The NOR gate (9) receives the output signals of the NOR gates (2) and (6) as input, and the ANDNO gate receives the Q11 output and Q12 output of the binary counter (1 digit) as input. <19 is the above NO
The output signal of the R gate (9) and the output of Q12 are input, and the OR gate Q3 is connected to the AND gate FQIQ.
0 which inputs the output signal of
A relay coil (RY3) is connected in series with a switching transistor (Q2) which is switched ON-OF'F by the output signal of the gate a3.

The ANDNO gate receives as input the output signal of the NOR gate (6), a signal indicating the energization state to the relay coil (RYl), and a signal indicating the energization state to the relay coil (RY3). A relay coil (RY2) is connected in series with a switching transistor (Q6) that switches ON-OFF based on the gate (national output signal).

In addition, in the above case, I Tulsi coil (RYI)
The signal indicating the energization state to (RY2) (RY3) is
The operation of a fan-type refrigerator-freezer having a configuration of 0 or more, in which each relay coil has a low level when energized and a high level when not energized, is as follows.

CI) Immediately after the power is turned on, the series circuit of the capacitor (Ct) and the resistor (R1) outputs a momentary positive signal, so all binary counters Q61 (1η(18) are cleared, and the NOR gate) Since the output signals of (2) and (6) are at low level, and the output signals of ANDNO gate (8) and 01 are also at low level, counting is stopped. Therefore, LBD(LEDI)(LBD2) is O
Since the FF state is maintained, and the output signals of the OR gate [alpha] and the AND gate (15) are at low level, the relay coils (RY2) (RY3) also maintain the OFF state.

The relay coil (RYI) is turned ON or OFF by the output signal of the comparator a0. In other words, if the internal temperature detected by the thermistor (TH) becomes higher than the set temperature, the relay coil (RYI) is energized to operate the compressor motor (Ll) and the cold air circulation fan motor (R2).

When the relay coil (RYI) is energized, the output signal of the inverter 30 is at a high level and the AND
Since gate 01 is opened, the output of the oscillator is applied to the binary counter (18) to perform counting (totalizing the operating time of the compressor motor (Ll)). The compressor motor counted as above (
When the operation time of Ll) reaches the predetermined time T1, the Q12 output of the binary counter (18) becomes high level, and
No quick freezing or quick refrigeration set is available.
The output signal of the OR gate (9) is also at a high level, so the output signal of the ANDNO gate and the output signal of the OR gate 03 are both at a high level, turning on the switching transistor (C2) and energizing the relay coil (RY3). Then, the defrosting operation is performed by energizing the defrosting heater (R8). At this time, AND gate (4) (8
) (15) is set to a low level, and the switching transistor (C5) is turned on, the switching transistor (C4) is turned off, cutting off the current to the relay coil (RYI), and the compressor motor is turned off. (Ll) and cold air circulation fan motor (
Stop the operation of R2).

Also, by cutting off the power to the relay coil (RYI), the AND gate 01 is closed and the binary counter (
Stop counting 161.

When the defrosting operation is completed, the temperature of the evaporator (not shown), which has completely melted the frost, rises and the thermostat (S
W6) turns on, and the capacitor (C2) and resistor (R2
) A DC voltage is applied to the stopper series circuit, causing it to output a - instantaneous positive pulse. Therefore, the output signal of OR gate 01 also momentarily becomes high level, clearing the binary counter (18).

□Therefore, the Q+2 output becomes low and the output signal of the ANDNO gate and the output signal of the OR gate α1 are both at low level.
(Qs ) is cut off, and the relay coil ′ (R
At the same time, the relay coil (R
The energization to YI> is controlled by the temperature change inside the refrigerator.

[r1] When the quick freezing set switch (SWa) is turned on, the output signal levels of NOR gates (1) and (2) are inverted, and the AND gate (4) is opened to apply the output of the oscillator to the binary counter (1η). At the beginning of this operation, the OR gate (7) goes to the -instantaneous high level, clears the binary counter (16), and keeps the count stopped.

Also, during the above operation, the LED, (LEDl ”)
and the relay coil (RYI) are always energized, and the LED
(LBD2) and relay coils (RY2) (RY3) are not energized. Therefore, the compressor motor (Ll)
And the cold air circulation fan motor (R2) is forced to operate continuously, thereby making it possible to carry out the rapid freezing operation.

Also, since the output signal of the input terminal Q1) is held at a high level during the above operation, the AND gate 01
and output the output of the oscillator (1) to the output of the inary counter (1).
Counting (integrated count of compressor motor (Ll) operating time) is performed by applying voltage to 8i.

When the counted operating time of the compressor motor (L+) reaches a predetermined time TlK, the output of the input counter (the national Q12 output becomes a high level and the Qll output becomes a low level, but the NOR gate (2) Since the output signal of the ANDNO gate (9) is at a high level and the output signal of the NOR gate (9) is at a low level, the output signal of the ANDNO gate and the output signal of +3 remain at a low level, and the defrosting operation is not performed. Also, the binary counter 8) continues to count the total operating time of the compressor motor (Ll').

Then, when the counted operation time of the compressor motor (Ll) reaches a predetermined time T2, the Qll output becomes high level while keeping the Q12 output at a high level, so the output signal of the OR gate α] is becomes a high level, and as in case [I] above, the operation of the compressor motor (Ll) and cold air circulation fan motor (L2) is stopped, and the defrosting heater (L8) is energized to perform defrosting operation. .

After that, when the defrosting operation is finished, the relay coil k (R
A rapid freezing operation is performed by continuously energizing Y 1 ).

In addition, before the counted operating time of the compressor motor (L'') reaches the predetermined time T2, the switch (SW5) is activated.
When the rapid freezing operation is reset by inputting , the output signal of the NOR gate (2) becomes low level, and the
Since the output signal of ) becomes high level, the output signal of ANDNO gate and the output signal of OR gate )03 both become high level, immediately stopping the operation of the compressor motor (Ll) and cold air circulation fan motor (L2). , the defrosting operation is started by energizing the defrosting heater (L3).

In addition, when the rapid freezing operation continues for a predetermined time T3, the Q1o output of the binary counter (1η becomes high level and the output signal of the OR gate (3) becomes high level, so the binary counter (1η is cleared). At the same time, the output signal of the NOR gate (2) is set to a low level and the AND gate (
4) to stop the rapid freezing operation.

In this case, the defrosting operation must be started immediately in the same way as when the switch (SW5) is turned on.
I can do that.

1) When the quick refrigeration set switch (SW4) is turned on, the output signal levels of NOR gates (5) and (6) are inverted, and the AND gate (8) is opened to apply the output of the oscillator to the binary counter. Counternote is done by doing this. In addition, at the beginning of this operation, the OR game H3) becomes -momentary high level and the binary counter (1 force is cleared,
Counting remains stopped.

Also, during the above operation, L E D (LED2
) is always energized, the LED (LEDI> and relay coil (RY3) are not energized, and the relay coil (RYI
) is energized only when the temperature inside the refrigerator is above the set value, and the relay coil (RY2) is energized only when the relay coil (RYI) is not energized. be done.

Follow? , the compressor motor (Ll) rotates intermittently, but the chilled air circulation roller motor (L2) is forcibly operated continuously, thereby making it possible to perform the rapid refrigeration operation. 5. '□1 In addition, when the above operation is performed, the compressor motor is turned on (L1), 5.i, when the compressor is running, that is, when the relay coil (RYI) is energized, the inverter is opened and the oscillator is turned on. By applying the output of (a) to the binary counter (18), the count (compressor motor (L)
l) Perform cumulative counting of operating hours).

Then, when the counted operating time of the compressor motor (Ll) reaches a predetermined time T1, the Q12 output of the binary counter 08) becomes a high level, and the Qll output becomes a low level, but the output of the NOR gate (6) Since the signal is at a high level, the output signal of the NOR gate (9), AN
-4 with output of DNO gate output signal and OR gate 0]
All remain at a low level and no defrosting operation is performed.

In addition, the binary counter Cl8) continues to count the total operating time of the compressor motor (Ll).

When the operating time of the compressor motor (Ll) reaches a predetermined time □゛↑2, the Qll output becomes high level while keeping the Q12 output at a high level. 0] The force signal becomes high and becomes pale, and the compressor motor (Ll) and cold air circulation fan motor (
L2) is stopped, and the defrosting heater (L3) is stopped.
) to perform defrosting operation. □゛ After that, when the defrosting operation is finished, the relay coil (RYI)
The relay coil (RYI) is energized intermittently, and when the relay coil (RYI) is not energized, the relay coil (RY2) is energized to force the cold air circulation fan motor (L2) to operate continuously, thereby performing a rapid refrigeration operation.

Also, before the counted operating time of the compressor motor (Ll) reaches the predetermined time T2, the switch (SW5
) to reset the rapid refrigeration operation, the output signal of the NOR gate (6) becomes low level, and the NOR gate (
Since the output signal of 9) becomes high level, both the output signal of the ANDNO gate and the output signal of the OR gate α become high level □, and the operation of the compressor motor (Ll) and cold air circulation fan motor (L2) is immediately stopped. The defrosting operation is started by energizing the defrosting heater (L8).

In addition, when the rapid refrigeration operation continues for the predetermined time T4, the Q9 output of the binary counter (16) becomes high level and the output signal of the OR gate (7) becomes high level. At the same time, the output signal of the NOR gate (6) is set to low level and the output signal of the AND gate (8
) to stop the rapid refrigeration operation.

In this case as well, the defrosting operation can be started immediately when the switch (SW5> is turned on).

As described above, the present invention allows the rapid freezing or rapid cooling operation to be continued without defrosting even if the time to start defrosting comes while the rapid freezing or rapid cooling operation is being performed. In addition, if the duration of the rapid freezing or rapid refrigeration operation exceeds a predetermined time, the rapid freezing or rapid refrigeration operation is interrupted and defrosting operation is performed. It has unique effects such as being able to eliminate drawbacks such as an unnecessarily high internal temperature and incomplete defrosting.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is an electrical wiring diagram of a fan-type refrigerator-freezer, Fig. 2 is an electrical wiring diagram of the control section, and Fig. 3 (a) and (b) are respectively a binary counter (national Qo of
A diagram showing the specific output and Q12 output. Figure (C) is a diagram showing the Qlo output of the binary counter (1η). Figure (d) is a diagram showing the Q9 output of the binary counter (I6). 1.2, 5. 6.9...NOR gate, 3.7.13
．． 14...OR gate, 4, 8, 1G, 1
1.12.15...AND gate. 19... Comparator, 16.17.18... Binary counter, 20...
Oscillator, 21... Inverter, LEDl, LE
D2...LED% ItY1. RY2. RY3...Relay coil. Rys, RYI, Rys...Relay contact, SWI, S
W2. ...-8Wr, ...switch. SW6...Bimetal sLt...Compressor motor. L2... Fan motor for cold air circulation, L3... Heater for defrosting, TH... Thermistor 0 Applicant Sharp Corporation No.1al

Claims (1)

[Claims] (2) means for integrating the operating time of the compressor motor and outputting a time signal when the accumulated time reaches one of two set times; and means for forcing the compressor motor or cold air circulation fan motor to operate continuously; , a means for outputting a forced operation signal during forced continuous operation, and a means for determining the presence or absence of a forced operation signal when outputting a time limit signal in the first stage, and immediately outputting a defrosting command signal when there is no forced operation signal, and a means for outputting a forced operation signal. means for outputting a defrosting command signal when the forced operation signal disappears or a second stage time limit signal is output, whichever comes first; A fan-type refrigerator/freezer, characterized in that it is provided with means for forcing a compressor motor or a cold air circulation fan motor to operate again after defrosting is completed when a defrosting command signal is output by outputting a time limit signal. Defrost control device 0