JPS627990Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rapid cooling device for a refrigerator.The purpose of the invention is to perform rapid cooling operation of the freezer compartment for a set time in response to turning on the rapid cooling start switch. In the refrigerator,
To provide a rapid cooling device for a refrigerator that can control a rapid cooling operation so as to promptly start it while preventing and protecting a compressor from failure to start, and can achieve such control with a simple configuration. It is in.

An embodiment of the present invention will be described below with reference to the drawings.

In Figures 1 to 3, 1 is a heat insulating box, inside which a freezer compartment 3 and a refrigerator compartment 4 are separated by a heat insulating partition wall 2, and the freezer compartment 3 is box-shaped. It is formed by a freezer compartment cooler 5, and a refrigerator compartment cooler 6 is disposed within the refrigerator compartment 4. 7
8 is a door that opens and closes the front opening of the freezer compartment 3; 8 is a door that opens and closes the front opening of the refrigerator compartment 4;
An operation panel 9 is provided on the front of the door 7. A printed wiring board 10 is housed in the operation panel 9 as shown in FIG. 3, and this printed wiring board 10 has a switch 11 for starting rapid cooling, a switch 12 for canceling rapid cooling, and a switch 12 for setting the duration of rapid cooling. A linear sliding volume 13 and other electronic components (not shown) are provided. Further, on the front panel 9a of the operation panel 9, push buttons 11a and 12a for operating the rapid cooling start switch 11, rapid cooling canceling switch 12, an operating knob 13a for the volume 13, and a light emitting diode 14 for display are arranged. . Reference numeral 15 denotes a compressor disposed at the bottom of the back side of the heat insulating box 1, and reference numeral 16 denotes a power supply box disposed on the side of the compressor 15. The power supply box 16 houses a step-down transformer, a relay, etc., which will be described later.

FIG. 4 shows an example of a known refrigeration cycle to which the present invention is applied. In this figure 4, 17
is the capacitor, 18 is the main capillary tube, 1
Reference numeral 9 indicates a flow path control device such as a solenoid valve, 20 an auxiliary capillary tube, and 21 a bypass capillary tube. Connected like this. In such a refrigeration cycle, the solenoid valve 19 is configured to be in a closed state when the power is cut off and to be in an open state when the power is turned on. It exhibits a "first state" in which refrigerant is supplied to both the cooler 6 and the freezer cooler 5, and a "first state" in which refrigerant is supplied only to the freezer cooler 5 via the bypass capillary tube 21 when in the open state. It is designed to switch to the second state.

FIG. 5 shows a schematic electrical circuit configuration of the present invention. Reference numeral 22 denotes a temperature switch for the freezer compartment of a well-known configuration that detects the temperature inside the freezer compartment 3 and turns on when the temperature exceeds a set temperature, and a series circuit between this and the compressor 15 is connected between both terminals of the power plug 23. . Reference numeral 24 denotes a temperature switch for the refrigerator compartment of a well-known configuration that detects the temperature inside the refrigerator compartment 4 and turns off when the temperature exceeds a set temperature, and a series circuit between this and the solenoid valve 19 is connected between both terminals of the power plug 23. do. 25 is a freezer compartment cooler 5 and a refrigerator compartment cooler 6
This is a connecting pipe heater that heats the connecting pipe 26 (see FIG. 4) between the valve and the solenoid valve 19, and is connected in parallel with the solenoid valve 19. 27 is a step-down transformer, whose primary winding 27a is connected between both terminals of the power plug 23, and whose secondary winding 27b is connected to a center-tap type rectifier circuit 28, which outputs The terminal +Vcc is connected to a control circuit 29 which will be described later.
30 is a pick-up transformer that detects whether or not the compressor 15 is driven;
0a is connected in parallel with the compressor 15, the secondary winding 30b is connected between the output terminal P and the ground, and the output terminal P is connected to the control circuit 29. Such a pick-up transformer 30 connects the secondary winding 3 when the compressor 15 is in the driving state.
By inducing a detection voltage V _D of about 7 volts at 0b,
The configuration is such that this is output from the output terminal P. 31
is a relay having two normally open contacts 31a and 31b, one normally open contact 31a is connected in parallel with the temperature switch 22 for the freezer compartment, and the other normally open contact 31b is connected to the temperature switch 22 and the temperature switch 22 for the freezer compartment. Common connection point of compressor 15 and temperature switch 2 for refrigerator compartment
4 and a common connection point of the solenoid valve 19. Note that the relay 31 is controlled by the control device 29 as described later. Further, the step-down transformer 27, the rectifier circuit 28, the pick-up transformer 30, and the relay 31 described above are housed in the power supply box 16.

On the other hand, FIG. 6 shows a specific configuration of the control device 29, which will be described below. That is, the resistor 32 and the rapid cooling start switch 11
A series circuit of the resistor 33 and the rapid cooling release switch 12 is connected between the output terminal +Vcc of the rectifier circuit 28 and the ground, respectively.
The common connection point of the rapid cooling start switch 11 and the resistor 32 is connected to the set input terminal of the R-S flip-flop 34 which is a signal generation circuit, and the common connection point of the rapid cooling cancellation switch 12 and the resistor 33 is connected to the reset input terminal of the flip-flop 34. Connect to input terminal. Therefore, the flip-flop 34
When the rapid cooling start switch 11 is turned on, a low level signal is received at the set input terminal, a high level signal is received at the reset input terminal, and a set signal _S1 consisting of a high level signal is output from the set output terminal Q. Continuously outputs, and also
When the rapid cooling release switch 12 is turned on, a high level signal is received at the set input terminal, a low level signal is received at the reset input terminal, and the reset signal _S2 consisting of a low level signal is continued from the set output terminal Q. output. 35 is a timer circuit which starts timed operation when the input of the clear terminal CL connected to the reset output terminal of the flip-flop 34 is inverted to low level, and when the set timed operation time has elapsed, the output terminal starts operating. The configuration is such that a low level signal is output from the flip-flop 3.
It is input to the reset input terminal of No.4. Incidentally, the time limit operation time of the timer circuit 34 can be adjusted, for example, in the range of 30 to 90 minutes by the volume 13. 36 is the gate circuit
In the AND circuit, one input terminal is connected to the set output terminal Q of the flip-flop 34, and the output terminal is connected to the transistor 3 through the resistor 37.
It is connected to the base of 8. Above transistor 3
Numeral 8 constitutes a rapid cooling operation circuit 39 in the present invention together with the relay 31, and its collector is connected to the output terminal +Vcc via the excitation coil 31c of the relay 31, and its emitter is connected to ground. Note that 40 is a spike voltage absorbing diode connected in parallel with the exciting coil 31c.

Reference numeral 41 denotes a detection circuit including the pick-up transformer 30, and a diode 42 and a resistor 43 of the polarity shown are connected in series between the output terminal P of the pick-up transformer 30 and the signal line _L1 . Therefore, the detection circuit 41 rectifies the detection voltage V _D output from the pickup transformer 30 when the compressor 15 is in the driving state using the diode 42, and sends the rectified voltage as the gate open signal _S3 to the signal line L. Output to ₁ . 44 is a delay timer circuit that receives the output of the detection circuit 41, which connects an inverter 45, a resistor 46, inverters 47, 48, and a resistor 49 in order between the signal line _L1 and the other signal line _L2 , and , a charging/discharging capacitor 50 is connected between the common connection point of the resistor 46 and the inverter 47 and the ground, and a discharging resistor 51 and a diode 52 are further connected in parallel with the resistor 46. This delay timer circuit 44 is
When the drive of the compressor 15 is stopped, the detection voltage V _D from the pickup transformer 30 disappears, and the potential of the signal line L ₁ becomes zero, and the inverter 45
When the output of capacitor 50 is reversed to high potential
At the same time, the compressor 15 is started to be driven and a gate open signal _S3 corresponding to the detection voltage _VD is outputted to the signal line _L1 , so that the output of the inverter 45 is inverted to zero potential. At this time, the charge in the capacitor 50 is discharged through the resistor 51 and the diode 52. Therefore, the delay timer circuit 44 determines the charging period of the capacitor 50 (corresponding to the time constants of the capacitor 50 and the resistor 46), in other words, the delay timer circuit 44 determines when a predetermined period of time (for example, 5 minutes in this embodiment) has elapsed after the compressor 15 has stopped. A restraint signal _S4 consisting of a low level signal is outputted to the signal line _L2 only until this time, and after that 5 minutes have elapsed, a gate signal _S5 consisting of a high level signal is outputted. The restraining signal S ₄ from the delay timer circuit 44 is
The gate open signal input directly to the other input terminal of the AND circuit 36 and from the detection circuit 41 is
S ₃ , AND via a bypass diode 53 which is a bypass circuit provided in parallel with the delay timer circuit 44
The configuration is such that the signal is input to the input terminal of the circuit 36.

Next, the operation of the above configuration will be explained. In a normal cooling operation state in which the rapid cooling start switch 11 is not turned on, when both the freezer compartment 3 and the refrigerator compartment 4 are at or above the set temperature, the freezer compartment temperature switch 22 is turned on and the compressor 15 is turned on. The temperature switch 24 for the refrigerator compartment is
is off, the electromagnetic valve 19 is shut off and switched to the "first state". Therefore, the refrigerant discharged from the compressor 15 is supplied to both the refrigerator compartment cooler 6 and the freezer compartment cooler 5, and both the refrigerator compartment 4 and the freezer compartment 3 are cooled. When the temperature inside the refrigerator compartment 4 decreases due to such cooling operation and the refrigerator compartment temperature switch 24 is turned on, the solenoid valve 19 is opened and switched to the "second state", and the compressor 15 is turned on. The refrigerant discharged from the freezer compartment cooler 5 is supplied only to the freezer compartment cooler 5, and the cooling operation of the freezer compartment 3 is continued. When the temperature inside the freezer compartment 3 decreases due to such cooling operation and the freezer compartment temperature switch 22 is turned off, the compressor 15 is stopped by power cut and the operation of the refrigeration cycle is stopped. After this, when the temperature of the freezer compartment 3 rises above the set temperature, the temperature switch 22 for the freezer compartment is turned on and the compressor 1
5 is restarted, and the solenoid valve 19 is opened or closed depending on the temperature of the refrigerator compartment 4.
The same cooling operation as described above is repeated.

Next, a case will be described in which a rapid cooling operation of the freezer compartment 3 is performed, which is suitable for home freezing or when it is desired to quickly freeze water. That is, knob 13
Adjust the volume 13 with a and set the timer circuit 3.
5 is set to 30 minutes, for example, and the rapid cooling start switch 11 is turned on using the push button 11a, a set signal S ₁ (high level) is output from the set output terminal Q of the flip-flop 34 in the control device 29. signal) is output, and at the same time a low level signal is output from the reset output terminal, and this low level signal is given to the clear terminal CL of the timer circuit 35.
starts timed operation.

Now, if the compressor 15 is stopped at the time when the set signal _S1 is output as described above, the following operation is performed. That is, during the period until 5 minutes have passed after the compressor 15 stops, the delay timer circuit 44 outputs the restraint signal S ₄ (low level signal), and this restraint signal S ₄ remains unchanged.
A gate signal S ₅ (high level signal) is output from the delay timer circuit 44 after the above-mentioned period has elapsed. Therefore, the AND circuit 36 outputs the set signal S ₁ for a period of 5 minutes after the compressor 15 is stopped.
The set signal S ₁ is set after the above period has passed.
allow passage of. Then, the set signal _S1 is
After passing through the AND circuit 36, the set signal S ₁
The transistor 38 is turned on and the excitation coil 31c of the relay 31 is energized, so that the normally open contact 31
a, 31b are turned on, the compressor 15 is energized via the normally open contact 31a and the normally open contact 3 is turned on.
The electromagnetic valve 19 is energized via 1a and 31b. Therefore, the compressor 15 is energized and the solenoid valve 19 is energized and switched to the "second state", so that the refrigerant discharged from the compressor 15 is supplied only to the freezer cooler 5. A rapid cooling operation in the freezer compartment 3 is performed. When 30 minutes elapse after the start of such a rapid cooling operation and the timed operation of the timer circuit 35 ends, a low level signal is output from its output terminal T and applied to the reset input terminal of the flip-flop 34. A reset signal S ₂ is output from the set output terminal Q of the flip-flop 34.
(low level signal) is output. Then, the transistor 38 which receives this reset signal _S2 via the AND circuit 36 is turned off, and the normally open contacts 31a and 31b of the relay 31 are turned off. The energizing path of the solenoid valve 19 is then cut off, and the compressor 15 is then cut off, thereby ending the rapid cooling operation. Note that once the compressor 15 starts driving, the detection circuit 41 starts outputting the gate open signal _S3 , which is applied to the AND circuit 36 via the bypass diode 53. 36 allows passage of the set signal _S1 regardless of the operation of the delay timer circuit 44. Also, during rapid cooling operation, press button 1
2a, when the rapid cooling release switch 12 is turned on, the flip-flop 34 outputs a reset signal _S2 , and the rapid cooling operation is therefore stopped in the same manner as described above.

On the other hand, if the compressor 15 is being driven when the set signal _S1 is output by turning on the rapid cooling start switch 11, the following operation is performed. That is, while the compressor 15 is being driven, the detection circuit 41 outputs the gate open signal _S3 , and this gate open signal _S3 is applied to the AND circuit 36 via the bypass diode 53, so that rapid cooling is performed. When the start switch 11 is turned on, the set signal _S1 immediately passes through the AND circuit 36 and a rapid cooling operation similar to that described above is started.

According to the present invention, as is clear from the above explanation, in a refrigerator that can perform rapid cooling operation of the freezer compartment for a set time in response to an on operation of a rapid cooling start switch, the rapid cooling operation described above is provided. If the compressor is being driven at the time of operation of the start switch, rapid cooling operation can be started immediately, and if the compressor is stopped at the time of operation, the compressor is stopped until a predetermined period of time has elapsed. The start of the drive can be delayed for a while. Therefore, the rapid cooling operation can be controlled by detecting whether or not the compressor is in a driving state and starting promptly while preventing and protecting the compressor from failure to start. This can be achieved with a simple configuration of simply providing a bypass diode in parallel with the circuit.

[Brief explanation of drawings]

The drawings relate to one embodiment of the present invention.
The figure is a schematic vertical side view of the refrigerator, Figure 2 is a front view of the operation panel, Figure 3 is a vertical side view of the same part, Figure 4 is a diagram showing the refrigeration cycle, and Figure 5 is a schematic diagram of the entire refrigerator. The electrical circuit diagram, FIG. 6, is a diagram showing the electrical configuration of the main parts. In the figure, 5 is a cooler for the freezer compartment, 6 is a cooler for the refrigerator compartment, 9 is an operation panel, 11 is a switch for starting rapid cooling, 12 is a switch for canceling rapid cooling, 15 is a compressor, and 19 is a solenoid valve (flow road control device), 29
is a control device, 34 is a flip-flop (signal generation circuit), 35 is a timer circuit, 36 is an AND circuit (gate circuit), 39 is a rapid cooling operation circuit, 41 is a detection circuit, 44 is a delay timer circuit, 53 is a bypass diode ( bypass circuit).

Claims (1)

[Scope of utility model registration request] Equipped with a flow path control device that switches between a first state in which the refrigerant discharged from the compressor is supplied to both the refrigerator compartment cooler and the freezer compartment cooler, and a second state in which the refrigerant is supplied only to the freezer compartment cooler. The refrigerator includes a signal generation circuit that continuously outputs a set signal when a rapid cooling start switch is operated, and a signal generation circuit that forms an energizing path for the compressor when receiving the set signal, and simultaneously controls the flow path control device. a timer circuit that starts a timed operation in response to the operation of the rapid cooling start switch and stops driving the compressor when the timed operation ends; A detection circuit is provided to detect the drive state of the compressor and outputs a gate open signal when the compressor is in the drive state, and a detection circuit is provided to receive the output of this detection circuit and is provided for a predetermined period of time after the output of the gate open signal is stopped. a delay timer circuit that outputs a restraint signal until the time elapses; and a delay timer circuit that is interposed between the signal generation circuit and the rapid cooling operation circuit, and that outputs a set signal from the signal generation circuit when it receives a gate open signal from the detection circuit. and a gate circuit that allows a signal to pass through and applies it to the rapid operation circuit, and also blocks passage of the set signal when receiving a restraint signal from the delay timer circuit, and the restraint signal from the delay timer circuit is supplied to the rapid operation circuit. A rapid cooling device for a refrigerator, characterized in that the gate opening signal is input directly to the circuit, and the gate opening signal from the detection circuit is input to the gate circuit via a bypass circuit provided in parallel with a delay timer circuit. .