JPS6361869A - Refrigerator - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is of a forced ventilation system, and includes at least a freezer compartment;
The present invention relates to a refrigerator that includes a switching chamber that can be switched between freezing and refrigeration or a third temperature zone, and is equipped with a damper thermostat that uses electrical input to adjust the amount of cold air to the switching chamber.

BACKGROUND ART A conventional example will be explained with reference to FIGS. 4 to 6. In the figure, 1 is the refrigerator body, outer box 2. Inner box 3, and both boxes 2
, 3 is made up of a heat insulating material 4 filled between them. 6
is the first partition wall, which houses a cooler 62 and a blower for forced ventilation, and has a freezer compartment 8 in the upper part and a switching compartment 9 in which the temperature can be switched between freezing and refrigeration or a third temperature range in the lower part. Form a compartment. 10 is a second partition wall, which is similar to the first partition wall 5.
The switching chamber 9 is located in the upper part, and the refrigerator compartment 1 is located in the lower part.
1 is partitioned. 12, the cold air cooled by the cooler 6 is sent to the freezer compartment 8, the switching compartment 9. This is a duct for leading to the refrigerator compartment 11, and the switching compartment 9. Refrigerator room 1
Damper thermostans 13 and 14 (hereinafter referred to as electric damper thermos 13 and 14) are provided at the inlets of each damper thermostat 13 and 14, respectively, for adjusting the amount of cold air inflow according to electrical input. Taking the electric damper thermometer 13 for the switching chamber as an example, its details will be explained. 16 is a solenoid;
6 is a damper operated by the solenoid 16 to open and close the cold air passage. 17 is a damper case with an air passage section 18. A mechanical part 19 is formed in the lower part. Reference numeral 2o denotes a rod that pushes up the damper 16 in the opening direction, which passes through a part of the damper case 17 and communicates with the air passage section 18 and the mechanical section 19, and whose upper end is pivotally supported by the air passage section 18. The damper 16 is in contact with a part of the lower surface thereof. 21
is a plunger connected to the rod 20, which is inserted into the inner core of the solenoid 15 housed in the mechanical part 19 and is movable up and down. Reference numeral 22 denotes a spring, which normally biases Pushinger 21 downward. or,
23 is a spring that biases the damper 16 in the closing direction. It should be noted that the solenoid 15a and the damper 16a of the electric damper thermometer 14 for the refrigerator compartment will be distinguished for the sake of explanation, but the structure including the others is completely the same.

Next, reference numerals 24 and 25 are control panels that accommodate the electric damper thermos 13 and 14, respectively.The control panel 24 has a cold air discharge passage 27 formed with a heat insulating material 26, and the control panel 26 has a heat insulating material 28. A formed cold air discharge air passage 29,30 is provided. Also, 31,3
2.33 is the freezer compartment 8. Switching room 9. This is a temperature sensor such as a thermistor provided in the refrigerator compartment 11.

Next, the control circuit will be explained.

34 is a compressor of the refrigeration cycle, which is connected in parallel with the blower 7 and then connected to a power source via a relay contact 36. The solenoid 16 of the electric damper thermostat 13 for the switching chamber is connected in series with the relay contact 36 and then connected to the power source. Further, 15a is a solenoid for the electric damper thermometer 14 for the refrigerator compartment, which is connected in series with the relay contact 37 and then connected to the power source.

38 is a freezing room temperature control device, which includes a temperature sensor 31 such as a thermistor. A comparison circuit including resistors R1, R2, R3 and a comparator 39, and an OR circuit 40. Transistor 41. A relay coil 42 is provided, the output of the comparator 39 is connected to one input of the OR circuit 4o, and the output of the OR circuit 40 is connected to the base of the transistor 41. Further, the collector of the transistor 41 is connected to the relay coil 42 for attraction, which opens and closes the relay contact 36.

43 is a switching room temperature control device, which includes a temperature sensor 32 such as a thermistor. A comparison circuit including resistors R4, R5, R6 and a comparator 44 and an OR circuit 45. AND circuit 46. ○R circuit 47. Transistor 48. It is equipped with a relay coil 49 and a refrigeration changeover switch 60. The comparator 44
The output of the refrigeration changeover switch 6Q is connected to the input of the OR circuit 46, the output of the OR circuit 45 is connected to one input of the AND circuit 46, and the output of the AND circuit 46 is connected to one input of the OR circuit 47. OR circuit 4 is input to the input of
The output of 7 is connected to the base of the transistor 48, and the collector of the transistor 48 is connected to a suction relay coil 49 for opening and closing the relay contact 36.

Reference numeral 51 denotes a refrigerator room temperature control device, which includes a temperature sensor 33 such as a thermistor. Comparison circuit with resistors R7, R8, R9, comparator 52 and transistor 63° relay coil 54
The output of the comparator 52 is connected to the base of the transistor 53, and the collector of the transistor 53 is connected to the relay coil 64 for attraction that opens and closes the relay contact 37.

Reference numeral 55 denotes a quick freezing device, which includes a quick freezing switch 56, a timer 67 that generates an output only for a certain period of time if there is an input, and an AND circuit 58. If there is an input, to Hn within the time synchronized with the timer 67.

It is composed of a timer 69 that alternately repeats the "L" output in a predetermined pattern over time, and an inverter circuit 60.The outlet of the quick freezing switch 56 is connected to the input of the timer 57, and the output of the quick freezing switch 56 is connected to the input of the timer 57. is connected to one input of the OR circuit 40 of the freezer compartment temperature control device 38.

Further, the output of the quick freezing switch 66 is the AND
Also connected to one input of the circuit 58, the AND circuit 68
The output of the timer 69 is connected to the input of the timer 69, and the output of the timer 59 is connected to one input of the OR circuit 47. One input of the AND circuit 58 is connected to the output of the refrigeration changeover switch 49.

The output of the AND circuit 68 is connected to one input of the AND circuit 46 via the inverter circuit 60. In this configuration, when the temperature of the freezing compartment 8 is higher than a predetermined value, the resistance value RTH1 of the temperature sensor 31 of the freezing compartment is small, and the potential at point A determined by this resistance value RTH1 and the resistance R1 However, the resistances R2 and R3
The potential at point B becomes higher than that determined by the comparator 39.
Since the output of the OR circuit 40 becomes "High" (hereinafter referred to as "H"), the output of the OR circuit 40 connected to it also becomes "H", turning on the transistor 41 and making the relay coil 42 conductive. 35 is closed and the compressor 34
and the blower 7 are operated, and the freezer compartment 8 and the switching compartment 9. Cooling of the refrigerator compartment 11 is performed. After that, when the freezing compartment 8 is cooled to a predetermined temperature, the resistance value RT of the temperature sensor 31 of the freezing compartment
Since H1 becomes larger and the A potential becomes smaller than the B potential, the comparator 39 generates a "Low" (hereinafter referred to as "L") signal. Here, since the quick freezing switch 66 is not turned on and one input of the OR circuit 40 is "L", its output becomes "L#".
1 is turned off and conduction to the relay coil 42 is cut off.
Relay contact 35 opens and compressor 34. The blower 7 stops.

On the other hand, regarding the temperature control of the switching chamber 9, when the temperature of the switching chamber 9 is higher than a predetermined value in normal times, the resistance value RTH2 of the temperature sensor 32 of the switching chamber becomes small, and the resistance value RT
The potential at the 0 point determined by H2 and resistor R4 is the potential of resistor R6,
The potential at point D determined by R6 becomes higher, and the output of the comparator 44 becomes "H", so the output of the OR circuit 46 also becomes "H" regardless of the other input of the OR circuit 45I)A
One input of the ND circuit 46 also becomes ``H''. Here,
Neither the freezing selector switch 60 nor the quick freezing switch 5e is turned on, and the output of the AND circuit 68 is "L".
The other input of the AND circuit 46 also becomes "H" through the inverter circuit 60, and the output of the AND circuit 46 becomes "H".
Therefore, regardless of the other input of the OR circuit 47, the output of the OR circuit 47 also becomes "H" and the transistor 48 is turned on. Then, the relay coil 49 becomes conductive and the relay contact 36
is closed, and the solenoid 15 of the electric damper thermometer 13 on the switching chamber side becomes conductive, so that the damper 16 is opened and cold air flows into the switching chamber 9 to cool it. Thereafter, when the temperature of the switching chamber 9 is cooled to a predetermined temperature, the resistance value RTH2 of the temperature sensor 32 of the switching chamber becomes large, and the C potential becomes smaller than the C potential, so the output of the comparator 44 becomes "L".
Therefore, the output of the AND circuit 45 becomes "L". At this time, since the refrigeration selector switch 60 is not turned on and its output is 'L', the output of the AND circuit 58 is 'L', and the output of the timer 69 is also 'L', so the input of the OR circuit 46 is becomes "L", its output also becomes "L", the output of the AND circuit 46 becomes "L", and the OR star 48 is turned off. At this point, conduction to the relay coil 49 is cut off and the relay contact 36 is opened, so that the conduction to the renoid 15 is also cut off and the damper 16 is closed to prevent cold air from flowing into the switching chamber 9. By repeating the above actions, the switching chamber 9
refrigerated (0 to 10°C) or stored in a third temperature range (e.g. -
3-0°C).

On the other hand, regarding the temperature control of the switching chamber 9 when the refrigeration selector switch 5o is turned on, the refrigeration selector switch 5o
When input, its output becomes "H" and the OR circuit 45
The output of the is "H#" regardless of the other input.Here, since the quick freezing switch 56 is not turned on, the output is "L", and the output of the AND circuit 68 is also "L".
”, and the AND circuit 46 via the inverter circuit 60
When the input of ``H#'' is input, the output of the OR circuit 45 is also tHn.
Therefore, the output of the AND circuit 46 becomes "H", and O
The output of the R circuit 47 becomes "H" regardless of the other input, the transistor 46 is forcibly turned on, the relay coil 47 becomes conductive, the relay contact 36 is closed, and the electric damper thermostat is turned on. No. 13 solenoids 15 become conductive. While the damper 16 is opened and the refrigeration changeover switch 6o is turned on into the changeover chamber 9, a large amount of cold air is continuously fed in to maintain the changeover chamber 9 at the freezing temperature.

In addition, regarding temperature control of the refrigerator compartment 11 during this period, if the temperature of the refrigerator compartment 11 is higher than a predetermined value, the resistance value RTH3 of the temperature sensor 33 provided in the refrigerator compartment 11 becomes small, and the resistance value RTH3 The potential at point E determined by resistor R7 becomes higher than the potential at point F determined by resistors R8 and R9, and the output of comparator 52 becomes "H", so transistor 53 is turned on. Then, the relay coil 64 becomes conductive, closing the relay contact 37, and the solenoid 15a of the electric damper thermo 14 for the refrigerator compartment becomes conductive, so that the damper 16a is opened and cold air flows into the refrigerator compartment 11 to cool it. Thereafter, when the temperature of the refrigerator compartment 11 is cooled to a predetermined temperature, the resistance value RTH3 of the temperature detector 33 provided in the refrigerator compartment 11 becomes large, and the E potential becomes smaller than the F potential, so the comparator 62 The output of becomes 1Ln,
Transistor 53 is turned off. and relay coil 5
Since the conduction to the solenoid 15a is cut off and the relay contact 37 is opened, the conduction to the solenoid 15a is also cut off and the damper 16
a closes to prevent cold air from flowing into the refrigerator compartment 11.

Such actions are repeated to maintain the refrigerating chamber 11 at a predetermined refrigerating temperature.

Next, the operation of the quick freezing device 53 will be described.

When the quick freezing switch 66 is turned on, its output is “H”
This is input to the timer 67, and from that point on, the timer S continues to generate an "H" output for a predetermined period of time. Therefore, the OR circuit 40 of the freezer compartment temperature control device 38
The output is "H" regardless of the input from one comparator 39.The transistor 41 is forcibly turned on and the relay coil 42 is conductive.Then, the relay contact 35 is closed and the compressor 34 is turned on. Then, the blower A is forced to operate continuously to perform a rapid freezing action on the freezer compartment 8.

After that, when the timer 57 completes the integration for a certain period of time, the output returns to "H" and one input of the OR circuit 40 becomes "H", but the inside of the freezer compartment 8 has become extremely low temperature due to the quick freezing effect. Therefore, the resistance value RTH1 of the temperature sensor 31 is also sufficiently low, and as a result, the output of the comparator 39 is "H", that is, the other input of the OR circuit 4o is also "L#", so the output of the OR circuit 40 is The output becomes L#.Then, the transistor 41 turns OFF L, conduction to the relay coil 42 is cut off, the relay contact 36 opens, and the compressor 34
Then, the blower 7 stops and the quick freezing action ends.

Next, when a quick freezing operation is performed after setting the freezing temperature in the switching chamber in this way, the output of the quick freezing switch 66 becomes "H", the output of the freezing selector switch 60 also becomes "H#", and the AND circuit 58 If the output is “H#”, timer 59
The output of is ta Hn.

aL" output is generated alternately in a predetermined pattern. Here, since the output of the AND circuit 58 is "H",
If the input of the AND circuit 46 becomes "H" via the inverter circuit 6o, the output becomes "L II" regardless of one input of the AND circuit 46, and the input of the OR circuit 470 becomes "L". Therefore, the output of the OR circuit 47 generates "H#" only while the output of the timer 59 is "H", and the transistor 48 also outputs "H#" in accordance with this.
N and OFF are repeated alternately, and as a result, the damper of the electric damper thermometer 13 is controlled to open and close over time according to the timer 59, and during this time, cold air is sent into the switching chamber 9 only during the time period when the damper 16 is open. In particular, the switching chamber 9 is not overcooled and is maintained at a predetermined freezing temperature.

Problems to be Solved by the Invention However, if the freezing selector switch 5o is released during rapid freezing, the timer 59 will stop, and during that time the temperature will be maintained at a predetermined level by the switching room temperature control device 43. , when the refrigeration selector switch 5Q is turned on again,
The output ' of the timer 69 starts to output again in a predetermined pattern such as "H" and "L#". Therefore, the damper 16 of the electric damper thermometer 13 in the switching chamber must be
operates from the open position, so if the refrigeration switch is turned on and off frequently, it will be forcibly opened, and at the same time continuous cooling of the freezer compartment 8 due to the rapid freezing effect, cold air will also be continuously supplied to the switching compartment 9. However, there is a problem in that the amount of cold air that is originally required by the louse is insufficient for the freezer compartment 8, and a sufficient rapid freezing effect cannot be obtained. On the other hand, since the switching chamber 9 is also cooled to a very low temperature at the same time, there are problems such as dew condensation on the outer shell in a humid environment due to reduced insulation properties and overcooling of the refrigerator compartment 11 in low outside temperatures. Ta.

The present invention solves the above-mentioned problems, and improves the quick freezing effect when the switching chamber is set to freeze, and also solves the problem of condensation on the outer shell of the switching chamber in a humid environment and at low outside temperatures. The aim is to simultaneously solve the problem of overcooling in cold storage rooms.

Means for Solving the Problems In order to solve the above problems, the present invention provides that when a quick freezing operation is performed when the switching room is set to freeze, the damper of the damper thermostat of the switching room is set in a predetermined pattern during the quick freezing operation. The opening/closing pattern is controlled temporally and the operation of the opening/closing pattern continues even when the freezing setting is canceled.

According to the above-described configuration, when a quick freezing operation is performed when the switching compartment is set to freeze, the compressor and the blower are continuously operated to continuously send a large amount of cold air into the freezing compartment, but the damper is not used for the switching compartment. Since the damper of the thermostat is opened and closed at appropriate times based on a predetermined pattern, cold air is supplied to the switching chamber only when the damper is open, preventing the switching chamber from being overcooled unnecessarily. The amount of cold air flowing into the room increases.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3. In addition, the same reference numerals are used for the same configuration as before.
A detailed explanation thereof will be omitted and only different parts will be described.

In the figure, 43 is a switching chamber temperature control device, and a temperature sensor 32 such as a thermistor installed in the switching chamber 9 is a resistor R4.
, R5, R6 and a comparator 44 and an OR circuit 45. Transistor 48. It is equipped with a relay coil 49, a refrigeration selector switch SO, and an AND circuit 61.
The output of the comparator 44 is connected to one input of the OR circuit 45, and the output of the refrigeration changeover switch 50 is also connected to the AN input.
It is connected to the other input of the OR circuit 45 via the D circuit θ1. The output of the OR circuit 45 is connected to the pace of the transistor 48, and the collector of the transistor 48 is connected to a suction relay coil 49 that opens and closes the relay contact 36.

56 is a quick freezing device, and a quick freezing switch 56,"
If the "H" input is input, the timer 57 continues to generate the "H" output for a certain period of time.If the "H" input is input, the timer 5
A timer 69. which alternately repeats "H" and "L" outputs in a predetermined pattern within a time period synchronized with 7. It is composed of an inverter θ7° OR circuit 63. The output of the quick freezing switch 56 is the output of the timer 57°6.
The output of the timer 57 is connected to one input of the OR circuit 40 of the freezer temperature control device 38, and the output of the timer 69 and the inverter 61 are both connected to the input of the OR circuit 63. . Further, the output of the OR circuit 63 is connected to one input of the AND circuit 61 of the switching room temperature control device 43.

In such a configuration, when the switching chamber 9 is set to freezing,
When the refrigeration changeover switch 5o is turned on, its output becomes "H" and one input of the AND circuit 61 becomes "H". At this time, if the quick freezing operation is not being performed, the output of the quick freezing switch 56 of the quick freezing device 55 is "L", which is inverted by the inverter 62 and one input of the OR circuit 63 becomes "H". There is. Therefore, the output of the OR circuit 63 is also "H", and the other input of the AND circuit 61 is normally "H". Normally, when the refrigeration selector switch 50 is turned on, the output of the AND circuit 61 is is "H", that is, one input of the OR circuit 45 becomes "H", the transistor 48 turns ON, the relay coil 49 becomes conductive, and the relay contact 36 is closed. Then, the solenoid 16 is energized, the damper 16 of the electric damper thermometer 13 is opened, and a large amount of cold air is taken into the switching chamber 9 and cooled to freezing temperature.

Next, when a quick freezing operation is performed with the switching chamber set to the freezing temperature in this way, the output of the quick freezing switch 56 becomes "H" and at the same time, the timers 57 and 59 start time integration. At this time, since the timer 67 continues to generate an "H" output for a certain period of time, one input of the OR circuit 4o becomes "H" during that time, turning on the transistor 41, making the relay coil 42 conductive and closing the relay contact 35. . Then, the compressor 34 and the blower 7 are operated continuously to effect rapid freezing. Meanwhile, at the same time, the output of the timer 59 alternately generates "H" and "L" outputs in a predetermined pattern during that time, so the output of the inverter 62 becomes "L".
In addition to this, the output of the OR circuit e3 generates "H" only while the output of the timer 59 is "H", and is similarly input to one side of the AND circuit 61.

Here, even if the refrigeration setting switch 6o is released and the temperature of the switching chamber 9 is controlled by the switching chamber temperature control device 43, the timer 59 continues to output "H" and "L" temporally, and the refrigeration setting is again set. Even when the switch 50 is turned on, the damper 16 is controlled to open and close according to the temporally optimal "H" or "L" output. Therefore, the output of the AND circuit 61 also generates "H" only while the output of the timer 69 is "H", and the transistor 48 is also turned ON and OFF alternately over time via the OR circuit 45. Repeatedly, as a result, the damper of electric damper thermo 13 is set to timer ~5.
(During this period, cold air is sent into the switching chamber e only during the time when the damper 16 is open, so the switching chamber 9 is not overcooled. Also, the damper 16 When the refrigerator is closed, a large amount of cold air is concentratedly supplied to the freezer compartment, increasing the quick freezing effect of the freezer compartment.

Effects of the Invention As is clear from the above explanation, according to the present invention, the following effects can be obtained.

(1) Unnecessary cold air is not supplied to the switching compartment, and the amount of cold air to the freezing compartment increases accordingly, increasing the quick freezing effect of the freezing compartment.

(2) The switching chamber is not overcooled, and in a humid environment, it is possible to prevent condensation from occurring due to a decrease in insulation around the outer shell of the switching chamber.

(3) The switching chamber is not overcooled, and the overcooling effect on the refrigerator compartment due to a decrease in insulation properties can be suppressed, especially at low outside temperatures.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention;
Fig. 2 is a longitudinal sectional view of the refrigerator, Fig. 3 is an enlarged sectional view of main parts of the refrigerator in Fig. 2, Fig. 4 is a longitudinal sectional view of a conventional refrigerator, and Fig. 5 is Fig. 4. An enlarged cross-sectional view of the main parts of a refrigerator,
FIG. 6 is a control circuit diagram of the refrigerator shown in FIG. 4. 6...Cooler, 7...Blower, 8...
...Freezing room, 9...Switching room, 12...
... Duct, 13 ... Damper thermostat, 16 ... Damper, 34 ... Compressor, 60 ... Refrigeration selection switch, 58 ...
・Rapid freezing device. 6--Everyone wholesale v'J Calendar Sumire 12-1 duct f3-Gusipari Mosgunt (Electric Denver Pumo) /b--Dashiha 0-1 53 Figure 6-'+Immediate winding 7-Feed mourning

Claims (1)

[Claims] a freezing compartment, a switching compartment capable of switching the temperature between freezing and refrigeration or a third temperature zone, and a blower and duct for forcing cold air cooled by the cooler into the freezing compartment and the switching compartment;
a refrigeration changeover switch that is installed at the entrance of the switching chamber of the duct and forcibly opens a damper of a damper thermostat that adjusts the required amount of cold air from freezing to refrigeration by electrical input; At the same time, when the refrigeration changeover switch is turned on, the damper of the damper thermostat is controlled to open and close over time, and even when the refrigeration changeover switch is not turned on, the damper of the damper thermostat continues to operate in the temporal opening and closing pattern. Refrigerator with equipment.