JPS5845476A - Quick cooling device for 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 relates to a refrigerator having a freezer compartment and a refrigerator compartment, and more particularly to a rapid cooling device for a refrigerator that can rapidly cool the freezer compartment as needed. To provide a rapid cooling device for a refrigerator in which there is no possibility that the temperature in the refrigerator compartment may inadvertently rise after the rapid cooling operation of the freezer compartment is completed, and the stored items in the refrigerator compartment will not be adversely affected. It is in.

A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 shows an example of a known refrigeration cycle to which the present invention is applied. In Fig. 1, 1 is a cooler for the freezer compartment, 2 is a cooler for the refrigerator compartment, 3 is a compressor, 4 is a condenser, 5 is a main capritube, 6 is an auxiliary capiori tube, and 7 is a bypass cabillary. 8 is a solenoid valve that controls the wave path control device. In such a refrigeration cycle, the solenoid valve 8 is configured to exhibit a MINI state when the power is cut off and to exhibit an open state when the power is supplied.
F1 switches to the "first state" in which the refrigerant discharged from the compressor 5 is supplied to both the refrigerator compartment cooler 2 and the freezer compartment cooler 1 when it is in its closed state, and bypasses the refrigerant when it is in its open state. The "second state" K in which the liquid is supplied only to the freezer compartment cooler 1 via the cooling cap 7 is switched.

FIG. 2 shows a schematic electrical circuit configuration of the present invention. In this Figure 2, 9 is a temperature switch for the freezer compartment of a well-known configuration that detects the temperature in the freezer compartment and turns on when the temperature is higher than the set temperature.A series circuit between this and the compressor 5 is connected between both terminals of the power plug 100. It is connected. Reference numeral 11 denotes a temperature switch for the refrigerator compartment of a well-known configuration that detects the temperature inside the refrigerator compartment and turns off when the temperature exceeds a set temperature. There is. 12 is a relay with normally open contacts 1 and 2&, 15 is a relay with normally open contacts 131L, and one normally open contact 121& is connected to the temperature switch 9 for the freezer compartment.
and the other normally open contact 13& is connected between the common connection point of the freezer compartment temperature switch 9 and the compressor 3 and the common connection point of the refrigerator compartment temperature switch 11 and the solenoid valve 8. . Incidentally, the relays 12 and 15 are controlled by a timer device 14 as described later.

Now, FIG. 3 shows a specific configuration of the timer device 14 and nine parts related thereto, and this will be described below. That is, a series circuit of an automatic reset normally open type set switch 15 and a resistor 16, which are quick freezing switches, a series circuit of an automatic reset normally open type reset switch 17 and a resistor 18, and a Zener diode 19 of the polarity shown are each added. Electric i! The common connection point of the set switch 15 and the resistor 16 is connected to the 1- terminal of VDD and the ground terminal through the resistor 2o, and the common connection point of the set switch 15 and the resistor 16 is connected to the R-S flip-def switch 21 (this!iI!fit) in the timer device 14. !i*teti 2
(consisting of a 10N OR circuit) is connected to the input terminal SK, and the common connection point of the reset switch 17 and resistor 18 is connected to the reset input terminal RK* of the flip-flop 21. Therefore, when the set switch 15 is turned on, the flip-flop 21
The set input terminal S receives a high level signal and the reset input terminal R) (receives a low level signal and outputs a loan μ signal from the reset output terminal +4.
Further, when the reset switch 17 is turned on,
A low level signal is received at the set input terminal S, a high level signal is sent to the reset input terminal R, and a high level signal is output from the reset output terminal Q. On the other hand, 22 is a transistor for driving the relay 12, 25 is a transistor for driving the relay 15, and the relay 1
The series circuit between the excitation coil L/12b of No. 2 and the collector e emitter of the transistor 22, and the series circuit between the excitation coil A/15'l) of the relay 13 and the collector emitter of the transistor 25 are connected to the positive power terminal, respectively. Connected between +VIID and the ground terminal. Further, a series circuit of a round light emitting diode 24 and a resistor 25, which indicates that the freezer compartment is in a rapid cooling operation state, is connected in parallel with the exciting coil A/13b. Now, in the timer device 14, 26 is a binary counter that receives the clock pulse output from the OR oscillation circuit 27 at the clock input terminal OK and counts it.
This binary counter 26 counts tarok pulses only when the input to the clear terminal CI is at a low level, and outputs a high level signal from the output terminal Qzs when the counted value reaches "2". , the count value is r
To 2'4J.

The configuration is such that a high level signal is output from the output terminal Q14 when the target level is reached. Incidentally, the cycle of the Couttabacus outputted from the OR oscillation circuit 27 can be adjusted by the variable resistor 27&, so that the pinary count! 26
The time required from the start of counting until the outputs of the output terminals Q45 and Q14 are inverted to high level signals, that is, the time limits, are, for example, 30 to 90 minutes and 60 to 180 minutes, respectively. It can be set with [. The output terminals Q and 14 of the binary counter 26 are connected to the reset input terminal R of the block 7p and the output terminal Q and 11 are connected to one input terminal of the N0Ru path 2B. The other input terminal of this NOR circuit 28 is connected to the reset output terminal Q of the flip-flop 21, and the output terminal is connected to the base of the transistor 23 via a resistor 29. First, the clear terminal OL of the binary counter 26 is connected to the reset output terminal QK of the flip-flop 21, and this reset output terminal Q is also connected to the base of the transistor 220 via a NOT circuit 50 and a resistor 51.

Next, the operation of the above configuration will be explained. In the normal cooling operation state when the set switch 16 is not turned on, when both the freezer compartment and the refrigerator compartment are at or above the set temperature, the freezer compartment temperature switch 9 is turned on and the compressor 3
is activated, and the temperature switch 11 for the refrigerator compartment is turned off, and the solenoid valve 8 is closed and switched to the ``first state''. Therefore, the refrigerant discharged from the compressor 8 is supplied to both the expansion refrigerator compartment cooler 2 and the freezer compartment cooler 1, and both the refrigerator compartment and the freezer compartment are cooled.

When the temperature in the refrigerator compartment decreases due to such cooling operation and the refrigerator compartment temperature switch 11 is turned on, the solenoid valve 8 is energized and switched to the "second state", and the air is discharged from the compressor 5. The refrigerant is supplied only to the freezer compartment cooler 1, and the cooling operation of the freezer compartment continues. When the temperature in the freezer compartment decreases due to such cooling operation and the freezer compartment temperature switch 9 is turned off, the compressor +3 is stopped by power cut and the operation of the freezer cycle fi/ is stopped. The temperature switch 9 for the freezer compartment is turned on, and the operation of the compressor 5 is restarted.
Furthermore, when the solenoid valve 8 is opened or closed depending on the temperature of the refrigerator compartment, the same cooling operation as described above is repeated.

Next, a description will be given of a case where a rapid cooling operation of a freezer compartment is performed, which is suitable for home freezing or when it is desired to quickly freeze water. In other words, the variable resistor 271LK allows pinary counting! When the set switch 15 is turned on while setting the 260 time limit appropriately, a four-level signal is output from the reset output terminal Q of the flip-flop 21, and this low-level signal is outputted to the tariff fi of the binary counter 26 (, L, NOT circuit!$0 and NOR [II
Izs is given respectively. Therefore, the binary counter 26 starts counting clock pulses from the OR oscillator 27, and the F ranges! 22 is NO
T circuit 3, OK, is inverted and turns on when it receives a high level signal. T, Pinery Count! 2
At the start of the 60 counting operation, the counting contents are cleared to the initial state and the output terminals Q, I
Since low level signals are output from S and Ql m, the result is N.

A low level signal is input to both input terminals of the R circuit 28, and the NOR circuit 28 outputs a high level signal, thereby turning on the transistor 23. When the transistors 22 and 25 are turned on in this way, the light emitting diode 24 lights up, and each of the excitation coils #f21) and f3t) of the relay 12.15 is energized to open the normally open contacts 12 & 13.
When & is turned on, a compressor 50 energization circuit via the normally open contact 12a and a solenoid valve 80 energization circuit via the normally open contacts 12&, 15& are formed. Therefore, the compressor 5 is energized and driven, and the solenoid valve 8 is energized and switched to the "second state", so that the refrigerant discharged from the compressor 3 is supplied only to the freezer compartment cooler 1. In this way, rapid cooling operation in the freezer compartment is performed. After such rapid cooling operation starts, variable resistor 2
Set by 7L, nine hours have passed and Pinery Count! When the count value of 226 reaches r2''J, a high level signal is output from the output terminal Q1 and the NOR circuit 2
8, the NOR circuit 28 outputs a low level signal and the transistor 23 is turned off. Then, the light emitting diode 24 turns off, the normally open contact 13 & of the relay 13 turns off, and the solenoid valve 8 is shut off and switched to the "first state", thereby starting the rapid cooling operation of the freezer compartment. At the same time, the freezer compartment cooler 1 is turned on again.
Refrigerant is supplied to both the refrigerator compartment cooler 2 and the refrigerator compartment cooler 2.

By the way, during the period when the solenoid valve 8 is switched to the "second state" and rapid cooling operation of the freezer compartment is performed, the temperature TF in the freezer compartment drops to nearly -40°C, as shown in Fig. 4. However, during this period, no refrigerant is supplied to the refrigerator compartment cooler 2, and the temperature TR in the rounded refrigerator compartment gradually rises. Therefore, if the drive of the compressor 3 is stopped immediately after the rapid cooling operation of the freezer compartment is completed, there is a risk that the temperature TR in the refrigerator compartment will further rise and adversely affect the contents stored inside. Due to the fact that TF is lower, the re-on timing of the temperature switch 9 for the freezer compartment is delayed, so the problem becomes even larger. However, in the configuration of this embodiment, as described above, since the refrigerant is supplied to both the freezer compartment cooler 1 and the refrigerator compartment cooler 2 after the rapid cooling operation of the freezer compartment is completed, as shown in FIG. The refrigerator room temperature TR starts to drop, and the refrigerator room temperature i1!
&TR can be prevented from increasing inadvertently. In this case, the temperature TF in the freezer compartment increases, but the limit of the increase is below the optimum temperature of the freezer compartment, so there is no problem.

Now, after a certain period of time has passed after the solenoid valve 8 is switched to the "first state", the count value of the binary counter 26 becomes r2''.
When the flip-flop 21
is reset and a high-level signal is output from its reset output terminal Q''.Then, the binary counter 26 is cleared to the initial state and the transistor 22 is turned off, so the normally open contact of the relay 12 12
a is turned off, the energizing circuit of the compressor 3 via this normally open contact 12a is cut off, and the supply of refrigerant to the freezer compartment cooling 61 and the refrigerator compartment cooler 2 is thereby stopped. In addition, when the reset switch F7-17 is turned on during rapid cooling operation of the freezer compartment, a high level signal is output from the reset input terminal Q of the flip-flop 21, and both transistors 22 and 23 are turned off. 5. The electromagnetic valve 8 and the light emitting diode 24 are all cut off, and the rapid cooling operation is stopped.

FIG. 5 is a book showing a second embodiment of the present invention, and only the parts different from the first embodiment will be explained below.

That is, 32 is a contact point (o-'b) when manually operated.
) is a defrosting switch that is turned on between contacts (o and a) and automatically returns to the on state between contacts (o and a) when the freezer compartment cooler 1 (see Fig. 1) rises to a predetermined temperature or higher. 55 is a timer device, which consists of a first timer 54 and a second timer 55. The first timer 54 is connected to the timer motor 34
a.

It has cam switches 54b and 54a, and the timer sweater 34
When the cam switch 34b is energized, the cam switches 34b and 340 are turned on, and after this state is maintained for a predetermined period of time, for example, 45 minutes, the cam switch 34b is turned on.

54o is turned off. The second timer 55 has a timer motor 35a and a cam switch 35t), and when the timer motor 55a is energized, it turns on the strain switch 35b, and after maintaining this state for a predetermined period of time, for example, 30 minutes, the cam switch 35t is turned on. 5513 is turned off. On the other hand, 36 is an automatic reset normally open type set switch which is a quick freezing switch, 37 is an automatic reset normally closed type reset switch, 38 is for defrosting the freezer compartment, and 39 is a guarantee that the defrost switch 32 automatically resets. 3. A so-called DS heater is used for this purpose, 40 is a fuse, 41 is a door switch, and 42 is an interior light. Solenoid valve 8. Temperature switch for freezer compartment 9° Temperature switch for refrigerator compartment 1
It is connected with the 1st class as shown in the figure.

With such a configuration, when the set switch 36 is turned on, the timer motors 54 & and 35a are energized and the cam switch 54bs54a*351 is turned on, so that the first The timer 54 assumes a self-holding state, and an energization path for the compressor 3 via the cam switch 54b and an energization path for the solenoid valve 8 via the cam switches 54b and 55s are formed. Accordingly, the compressor 5 is energized and the solenoid valve 8 is switched to the "second state" K, and the rapid cooling operation of the freezer compartment is started in the same manner as in the first embodiment. After this, when the cam switch 55b is turned off after 50 minutes set in the timer 55 of the cylinder 2, the solenoid valve 8
is shut off and switched to the "first state" K, thereby ending the rapid cooling operation of the freezer compartment, and the compressor 3
continues to be driven, and refrigerant is supplied to both the freezer compartment cooler 1 and the refrigerator compartment cooler 2 (see FIG. 1 for both). After that, when another 15 minutes have elapsed, in other words, when the 45 minutes set in the first timer 34 have elapsed after the ON operation of the set switch 36, the cam switch 54'
6,540 turns off, timer mode 154 & 955
a is de-energized, and the compressor, 5. The electromagnetic valve 8 is also cut off, and the supply of refrigerant to the freezer compartment cooler 1 and the refrigerator compartment cooler 2 is stopped.

According to the present invention, as is clear from the above description,
Flow path control that allows switching between a first state in which the refrigerant from the compressor is supplied to both the freezer compartment cooler and the refrigerator compartment cooler, and a second state in which the refrigerant is supplied only to the freezer compartment cooler. The refrigerator is equipped with a rapid cooling system that allows the freezer to be cooled rapidly as needed. It is possible to achieve an excellent effect in that there is no harmful effect on the stored items in the refrigerator room and there is no chance of burying the stored items.

[Brief explanation of the drawing]

1 to 4 relate to the first embodiment of the present invention, in which FIG. 1 is a diagram showing a refrigeration cycle, a diagram showing the electrical configuration of the refrigeration cycle, and FIG. 4 is a temperature characteristic curve diagram for explaining the operation. It is. Moreover, FIG. 5 shows the entire second dormitory [1] of the present invention! It is an air circuit diagram. In the figure, %1 is a cooler for the freezer compartment, 2 is a cooler for the refrigerator compartment, 3 is a compressor, 8 is a solenoid valve (flow path control device), 14.5
5 is a timer device, and 15.56 is a set switch (quick freezing switch). Applicant Tokyo Shibaura Electric Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4 Cause

Claims (1)

[Claims] 1. A flow path that can be switched between a first state in which the refrigerant from the compressor is supplied to both the freezer compartment cooler and the refrigerator compartment cooler, and a second state in which the refrigerant is supplied only to the freezer compartment cooler. In a refrigerator equipped with a control device, an energizing path for the compressor is formed for a predetermined period of time in response to the operation of a quick freezing switch, and during this period, the flow path control device is kept in a second state for a preset period of time. A rapid cooling device for a refrigerator, characterized in that a timer device is provided for switching to a first state for a certain period of time after switching.