JPS6212223Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rapid cooling device for a refrigerator that rapidly cools the inside of the freezer compartment as needed.
The purpose of this is to be able to light up the display light emitting element at the same time as the quick cooling start switch is turned on, to notify that quick cooling operation has been selected, and to make it possible to notify that the quick cooling operation has been selected. To provide a rapid cooling device for a refrigerator that does not cause unnecessary misunderstanding to a user even when rapid cooling operation is not started immediately.

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, there are 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 as a light emitting element for display. Place. 15 is a compressor installed at the bottom of the back side of the insulation box 1, 16 is a compressor 1
A power supply box 16 is disposed on the side of the power supply box 5, and a step-down transformer, a relay, etc., which will be described later, are housed in the power supply box 16.

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; its primary winding 30
a in parallel with the compressor 15,
The secondary winding 30b is connected between the output terminal P and ground, and the output terminal P is connected to the control circuit 29. Such a pick-up transformer 30 has a secondary winding 30 when the compressor 15 is in a driving state.
The configuration is such that a detection voltage V _D of about 7 volts is induced in the terminal b and outputted 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 for the freezer compartment. and the common connection point of the compressor 15 and the temperature switch 24 for the refrigerator compartment.
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, and the high 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 an AND circuit, one input terminal of which is connected to the set output terminal Q of the flip-flop 34, and the output terminal connected to the resistor 3.
7 to the base of transistor 38. The transistor 38 together with the relay 31 constitutes a rapid cooling operation circuit 39 according to the present invention, 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.

Now, reference numeral 41 denotes a starting failure prevention circuit including the pickup transformer 30 and the AND circuit 36, which will be described below. That is, a diode 42 and a resistor 43 with the illustrated polarity are connected in series between the output terminal P of the pickup transformer 30 and the signal line _L1 .
When the pick-up transformer 3 is in the driving state,
The detection voltage V _D output from 0 is the diode 42
The rectified voltage is the gate open signal S ₃
It is output as signal line _L1 . 44 is a delay timer circuit, which includes an inverter 45, a resistor 46, and an inverter 4 between the signal line _L1 and the other signal line _L2 .
A capacitor 50 for charging and discharging is connected between the common connection point of the resistor 46 and the inverter 47 and the ground, and a resistor 51 for discharging and a diode are connected in parallel with the resistor 46. 52 are connected. This delay timer circuit 44 operates when the detection voltage V _D from the pick-up transformer 30 disappears due to the drive of the compressor 15 being stopped, the potential of the signal line _L1 becomes zero, and the output of the inverter 45 is inverted to a high potential. At the same time, the capacitor 50 is charged via the resistor 46, and the compressor 15 is started to be driven, and the gate open signal _S3 corresponding to the detection voltage _VD is output to the signal line _L1 , so that the output of the inverter 45 becomes zero. When the potential is reversed, 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 S ₄ consisting of a low level signal is output to the signal line L ₂ only until the 5 minutes have elapsed, and a gate signal S ₅ consisting of a high level signal is output.
Output. The constraint signal S ₄ from the delay timer circuit 44 is directly input to the other input terminal of the AND circuit 36, and the gate open signal S ₃ is
The configuration is such that the signal is input to the input terminal of the AND circuit 36 via a bypass diode 53 provided in parallel with the delay timer circuit 44.

54 is a transistor for driving the light emitting diode 14, whose base is connected to the set output terminal Q of the flip-flop 34, its emitter is connected to ground, and its collector is connected via the light emitting diode 14 and a resistor 55. Connect to output terminal +Vcc.

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 movement 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 1
3a adjusts the volume 13 to set the time limit operation time of the timer circuit 35 to, for example, 30 minutes, and when the rapid cooling start switch 11 is turned on using the push button 11a, the set output of the flip-flop 34 is set in the control device 29. A set signal S ₁ (high level signal) is output from the terminal Q, 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. Further, since the set signal _S1 output as described above is applied to the transistor 54 and turns on, the light emitting diode 14 is turned on at the same time as the rapid cooling start switch 11 is turned on, and thus the rapid cooling is started. Displays that driving has been selected.

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
Since contacts a and 31b are turned on, an energization circuit for the compressor 15 via the normally open contact 31a and an energization circuit for the solenoid valve 19 via the normally open contacts 31a and 31b are formed. Therefore, the compressor 15 is energized and driven, and the solenoid valve 19 is energized and switched to the "second state", so that the refrigerant discharged from the compressor 5 is supplied only to the freezer compartment cooler 5. The rapid cooling operation in the freezer compartment 3 is then performed. When the timer operation of the timer circuit 35 ends 30 minutes after the start of such a rapid cooling operation, 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 (low level signal) is output from the set output terminal Q of the flip-flop 34. 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 circuit 19 is then cut off, and the compressor 15 is cut off, thereby ending the rapid cooling operation. At the same time, a reset signal S ₂ is applied to the transistor 54 to reset the transistor 54.
is turned off, the light emitting diode 14 goes out,
A message indicating that the rapid cooling operation has been stopped is then displayed. Note that once the compressor 15 starts driving, the gate opening signal _S3 is outputted, and this is passed through the bypass diode 53.
Since it is applied to the AND circuit 36, the corresponding
The AND circuit 36 allows the set signal _S1 to pass regardless of the operation of the delay timer circuit 44. Also, during rapid cooling operation, push button 12a
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, the quick cooling operation of the freezer compartment is performed for a set time in response to the on operation of the quick cooling start switch, and the rapid cooling operation is performed for a set time. A rapid cooling system for a refrigerator that prevents malfunctions by delaying the start of the compressor until a predetermined period of time has elapsed after the compressor is stopped when the compressor is stopped at the time of operation. The display light emitting element can be turned on at the same time as the start switch is turned on, indicating that the rapid cooling operation has been selected, and the rapid cooling operation starts immediately after the quick cooling start switch is turned on. Even if the information is not provided, there is no risk of giving unnecessary misunderstanding to the user.

[Brief explanation of the drawing]

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
34 is a flip-flop (signal generation circuit), 35 is a timer circuit, 39 is a rapid cooling operation circuit, 41 is a starting failure prevention circuit, and 54 is a light emitting diode (light emitting element for display).

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 quick cooling start switch is turned on, and a flow path control device that simultaneously forms an energizing circuit for the compressor when receiving the set signal. a rapid cooling operation circuit that brings the compressor into a second state; and a timer circuit that starts a timed operation in response to an on operation of the rapid cooling start switch and stops driving the compressor upon completion of the timed operation. , a startup failure prevention circuit that detects the driving state of the compressor and prevents input of the set signal to the rapid cooling operation circuit until a predetermined time has elapsed after the compressor stops; and 1. A rapid cooling device for a refrigerator, comprising a display light emitting element that is turned on by the set signal when the signal is output.