JPS62206363A - 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] 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 equipped with a switching chamber capable of switching between freezing and refrigeration or a third temperature zone.

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
．． It is composed of a heat insulating material 4 filled between 3 and 3. 6
is the first partition wall, which houses a cooler 6 and a blower 7 for forced ventilation, has a freezing 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 section. Further, 9a is a temperature compensating heater provided at the lower part of the first partition wall 5 to keep the switching chamber 9 warm at low outside temperatures. A second partition wall 10 is located below the first partition wall 5, and defines the switching chamber 9 in the upper part and the refrigerating chamber 11 in the lower part.

Reference numeral 12 denotes a duct for guiding cold air cooled by the cooler 6 to the freezer compartment 8, switching compartment 9, and refrigerator compartment 11 using the blower 7. Damper thermostats 13 and 14 (hereinafter referred to as electric tamper thermos 13 and 14) are provided, respectively, to adjust the amount of cold air inflow in accordance with input. Taking the electric damper thermometer 13 for the switching chamber as an example, its details will be explained. 16 is a solenoid;
This is a damper that is operated by 5 to open and close the cold air passage.

Reference numeral 17 denotes a damper case, which has an air passage section 18 in its upper part and a mechanical part 19 in its lower part. Reference numeral 20 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. Reference numeral 21 denotes a granger connected to the rod 20, which is inserted into the inner core of the solenoid 16 housed in the mechanical section 19 and is movable up and down.

Reference numeral 22 denotes a spring, which normally biases the plunger 21 downward.

Further, 23 is a spring that biases the damper 16 in the closing direction. It should be noted that the electric damper thermostat 14 for the refrigerator compartment is also distinguished by a solenoid 15a and a damper 16al 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 house the electric damper thermos 13 and 14, respectively. The control panel 24 has a cold air discharge passage 27 formed of a heat insulating material 26, and the control panel 25 has a cold air discharge passage 27 formed of a heat insulating material 28. A cold air discharge air passage 29 is provided. Further, outside air temperature detectors 31, 32, and 33, such as thermistors, which are provided in a part of the outer shell of the main body 1 to detect the outside air temperature, are installed in the freezer compartment 8, respectively.
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 of the electric damper thermostat 14 for the refrigerator compartment, which is connected in series with the relay contact 37 and then connected to the power source. And switching room 9
The temperature compensation heater 9a is connected in series with the relay contact 38 and then connected to the power source.

39 is a freezing room temperature control device, which includes a temperature sensor 31 such as a thermistor. Comparison circuit with resistors R1, R2, R3, controller 4o, transistor 41. Relay coil 42
The output of the comparator 4o is connected to the base of a 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. Comparison circuit with resistors R4, R6, R6, comparator 44 and transistor 46° relay coil 46
and refrigeration selector switch 47. The output of the comparator 44 is connected to the input of the OR circuit 48 along with the output of the refrigeration changeover switch 47, and the output of the OR circuit 48 is connected to the base of the transistor 460 and the collector of the transistor 46. A suction relay coil 46 for opening and closing the relay contact 36 is connected to each of the terminals.

49 is a refrigerating room temperature control device, which includes a temperature sensor 33 such as a thermistor. A comparison circuit including resistors R7, R8, R, and a comparator 6o, and a transistor 61° relay coil 62
The output of the comparator 60 is connected to the base of the transistor 610, and the collector of the transistor 51 is connected to the relay coil 52 for attraction that opens and closes the relay contact 37.

Further, 63 is a temperature compensation heater control device for the switching chamber 9, which includes an outside air temperature sensor 30 such as a thermistor. It includes a comparison circuit including a resistor R, R, R comparator 64, an inverter 66/AND circuit 66, a transistor 67, and a relay coil 58. The output of the comparator 64 is inverted by the inverter 56, and the output of the refrigeration changeover switch 47 is inverted by the inverter 59.
It is connected to the input of the AND circuit 56 together with the inverted output. Further, the output of the AND circuit 56 is connected to the base of the transistor 57, and the collector of the transistor 67 is connected to a suction relay coil 68 for opening and closing the relay contact 38, respectively.

In such a configuration, when the temperature of the freezing compartment 8 is higher than a predetermined value, the resistance value RTH4 of the temperature sensor 31 of the freezing compartment is small, and the potential at point A determined by this resistance value RTH4 and the resistance R1 is determined by resistance R2°R3
The potential of the comparator 4o becomes higher than that of the point, and the output of the comparator 4o becomes “Hi”.
The transistor 41 turns on and the relay coil 42 becomes conductive.Then, the relay contact 35 is closed and the compressor 34 and the blower 7 are turned on.
is operated and the freezer compartment 8 and switching compartment 9. Cooling of the refrigerator compartment 11 is performed. Thereafter, when the freezer compartment 8 is cooled to a predetermined temperature, the resistance RT)fl of the temperature sensor 31 of the freezer compartment increases, and the potential A'll7L becomes smaller than the potential B, so the comparator 40 becomes LOW- (hereinafter referred to as ``L'') signal is generated. Therefore, the transistor 41 is turned off.
Then, conduction to the relay coil 42 is cut off, and the relay contact 35 is opened to open the 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 during normal operation is higher than a predetermined value, 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 R5,
The potential becomes higher than the potential at point D determined by R6, and the output of the comparator 44 becomes "H", so the output of the OR circuit 48 also becomes "h" and the transistor 46 becomes Oh regardless of the other input of the OR circuit 48. Then, the relay coil 46 becomes conductive, opening the relay contact 36, and the solenoid 16 of the electric damper thermostat 13 for heavy switching becomes conductive, so the damper 1
6 is opened and cold air flows into the switching chamber 9 to cool it down.

After that, when the temperature of the switching chamber 9 is cooled to a predetermined temperature, the resistance RTFi2 of the temperature sensor 32 of the switching chamber becomes large, and the C potential becomes smaller than the D potential, so the output of the comparator 44 becomes "L". ” becomes. At this time, the refrigeration selector switch 47 is not turned on and its output is L'', so the OR
All of the circuit 480 inputs are “L” and their outputs are also “L”.
'', the transistor 45 is turned OFF.Then, the conduction to the relay coil 48 is cut off and the relay contact 36 is opened, so the conduction to the solenoid 16 is also cut off, the damper 16 is closed, and the flow goes into the switching chamber 9. By repeating the above-mentioned actions, the switching chamber 9 is refrigerated (0 to 1 O
C) or maintained in a third temperature range (eg -3 to 0°C).

On the other hand, when looking at the temperature control of the switching chamber 9 when the refrigeration selector switch 47 is turned on, it is found that the refrigeration selector switch 47
When turned ON, its output becomes “I(” and the OR circuit 4
8 becomes 1H regardless of the other input, the transistor 46 is forcibly turned on, the relay coil 46 is made conductive, the relay contact 36 is closed, and the solenoid of the electric damper thermostat 13 is turned on. 15 becomes conductive.While the damper 16 is opened and the refrigeration selector switch 47 is turned on into the switching chamber 9, a large amount of cold air is continuously fed in to maintain the switching chamber 9 at the freezing temperature.

In addition, regarding the 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 smaller. When the potential at point E determined by RTHs and resistor R7 is higher than the potential at point F determined by resistors R8 and R9, the output of comparator 50 becomes "H" and transistor 61 is turned on. . Then, the relay coil 52 becomes conductive, closing the relay contact 37, and the solenoid 15a of the electric damper thermometer 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 RTH3 of the temperature sensor 33 provided in the refrigerator compartment 11 becomes large, and the E potential becomes smaller than the F potential, so that the comparator 6o The output becomes "L" and the transistor group is turned off. and relay coil 62
Since the conduction to is cut off and the relay contact 37 is opened,
The conduction to the solenoid 15a is also cut off and the damper 18a
is closed 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 outside temperature is set to a predetermined low outside temperature (e.g. 10'C).
) The temperature control of the switching chamber 9 when the temperature drops to below will be described. As the outside air temperature decreases, the amount of heat absorbed into the switching chamber 9 gradually decreases.The amount of cold air required to obtain the desired indoor temperature also decreases, and eventually the cooler maintains a low temperature without supplying cold air. 6. The heat is taken away by the duct 12 and the switching chamber 9 tries to be supercooled to below the desired temperature, but at this time,
When the outside air temperature sensor 3o of the temperature compensation heater control device 63 detects a predetermined low outside air temperature or lower, the potential at point G determined by resistors RTH4 and R4° changes to the potential at point H determined by resistors R1 and R42. If the voltage is lower than the potential, the comparator 64
The output of the υND circuit 66 is converted to "h" by the inverter 56. At this time, if the refrigeration changeover switch 47 is not turned on, that is, the changeover chamber is If the setting of 9 is not refrigeration, the output is "L", so the inverter 59 turns h
”, and the other input of the AND circuit 66 also becomes “H”.
”, and as a result, the output of the AND circuit 66 becomes “H” and the transistor 67 is turned on.

Then, the relay coil 58 becomes conductive and closes the relay contact 38, and the temperature compensation heater 9a of the switching chamber 9 becomes conductive and generates heat, heating the switching chamber 9 and maintaining it at an appropriate temperature to prevent overcooling. do. Note that when the outside air temperature is higher than a predetermined value, or when the refrigeration changeover switch 47 is turned on, that is, when the refrigeration setting is set, the comparators 54. Since the refrigeration changeover switch 470'''H'' output is converted to ``L'' by the inverter 55.59, one input of the AND circuit 66 becomes L' and the transistor 67 is not turned on. Therefore, the above-mentioned temperature compensation is performed. Heater 9a is not energized.

Problems to be Solved by the Invention However, in such a configuration, the temperature setting of the switching chamber 9 can be changed from freezing (e.g. -18°C) to refrigerating (0 to 1o'C) or a third temperature range (e.g. -3 to 0o'C). ℃), that is, when the refrigeration selector switch 47 is turned off, the indoor temperature is not raised by active heating means, and the insulation of the structure surrounding the switching chamber 9 facing the high temperature part is removed. The room temperature will gradually rise due to natural heat absorption from the wall, that is, the outside air or the insulating wall facing the refrigerator compartment 11, and it will take a considerable amount of time to reach the desired set temperature, and after switching the temperature setting, the room temperature will gradually rise. However, there was a problem that the waiting time until the food was stored was long, making it inconvenient to use.

The present invention solves the above-mentioned problems, and aims to shorten the switching time when switching the room temperature setting of the switching room from freezing to refrigeration or a third temperature zone.

Means for Solving the Problems In order to solve the above problems, the present invention provides: For a certain period of time immediately after switching the switching chamber from freezing to refrigeration or to the setting of the third temperature zone, regardless of the outside temperature, The temperature compensating heater for low outside temperatures in the switching room is energized, and during that time, the damper of the damper thermostat in the switching room is forcibly closed.

Effects of the present invention With the above-described configuration, immediately after switching the switching chamber from freezing to refrigeration or the third temperature zone, that is, immediately after releasing the freezing selector switch, the temperature compensation heater for low outside temperature is connected to the switching chamber. is forcibly energized to generate heat, and the switching chamber temperature quickly rises from the freezing temperature. At the same time, the damper with the damper thermostat is forcibly closed, and the desired temperature is reached in a short time without the inflow of cold air or the outflow of heated air. At approximately the same time, after a predetermined time period has elapsed, the forced energization of the temperature compensation heater is canceled and the normal cooling state is stabilized.

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, 6o is a temperature compensation heater control device for the switching chamber 9, and an outside air temperature sensor such as a thermistor is connected to a 30° resistor R101.
R11? a comparison circuit with an R121 comparator 64;
It is equipped with an inverter 55', an AND circuit 56, an OR circuit 61, a timer 62, a transistor 67, and a relay coil 68, and the timer 62 generates an "H" output only for a predetermined period of time after the "H" input is input. However, after a certain period of time has elapsed, it is automatically reset to generate an "L" output. and the comparator 54
The output obtained by inverting the output of the refrigeration selector switch 47 by the inverter 69 is connected to the input of the AND circuit 56, and the output of the AND circuit 56, together with the output of the timer 62, is connected to the output of the O
It is connected to the input of the R circuit 61. The output of the OR circuit 61 is connected to the transistor 570, and the collector of the transistor 57 is connected to a suction relay coil 68 that opens and closes the relay contact 38. Further, the input of the timer 62 is provided by the refrigeration selector switch 4.
An output obtained by inverting the output of No. 7 by an inverter 59 is connected.

63 is a temperature control device for the switching room, which includes a temperature sensor 32 such as a thermistor. Comparison circuit including resistors R4, R5, R6, comparator 44 and transistor 46° relay coil 4
6, and a refrigeration selector switch 47. It is equipped with an OR circuit 4a and an AND circuit 64, and the output of the comparator 44 and the output of the refrigeration changeover switch 47 are
80 input, and the output of the OR circuit 48 is connected to the AND
It is connected to one input of circuit 64. The other input of the AND circuit 64 is connected to the output obtained by inverting the output of the timer 62 with an inverter 66, and the AN
The output of the D circuit 64 is connected to the base of the transistor 45,
Further, the collector of the transistor 45 is connected to the relay contact 3.
A suction relay coil 46 for opening and closing 6 is connected.

In such a configuration, the outside air temperature is a predetermined temperature (for example, 1
0°C) or higher and the switching chamber 9 has been used in the freezing setting and is switched to the refrigeration or 30th temperature zone, the freezing selector switch 47 is turned on until then and the output is "L".
'' continues to be generated, and the input of the timer 62 is in the "L" state due to the inverting action of the inverter 69, that is, one input of the OR circuit 61 is in the "L" state.
Since the outside air temperature is higher than the predetermined temperature, the potential at point G, which is determined by the resistance RT)i4 of the outside air temperature detector 30 of the temperature compensation heater control device 6o and the resistance R1o, is
It is higher than the potential at point H determined by 1°. That is, the output of the comparator 54 is "L", one input of the AND circuit 5e is "L" due to the inverting action of the inverter 66, and at the same time, the output "H" of the refrigeration selector switch 4T is "L" due to the inverting action of the inverter 69. '', the other input of the AND circuit also becomes "L" and its output becomes "L", that is, the other input of the OR circuit 61 also becomes "L".
The output of the OR circuit 61 becomes "L", the transistor 5a is turned on, and the temperature compensation heater 9a is also not energized.

In such a state, when switching from freezing to refrigeration or the third temperature zone, that is, when the refrigeration selector switch 47 is released, the output becomes "L" and the inverter 69
The signal is inverted to "L" and the timer 62 starts counting time. During the time integration, the timer 62 continues to generate an "H" output and continues to send an "H" signal to one input of the OR circuit 61. Therefore, even if the other input of the OR circuit 61 is "L", that is, even if the outside temperature is higher than a predetermined value, the output of the OR circuit 61 will generate "H", and the transistor 57 will turn ON L; The relay coil 58 is conductive and attracts the relay contact 38, and the temperature compensation heater 9a is energized.

Therefore, heating action is started on the switching chamber 9.

Also, at the same time, during this period, the output of the timer 62 is high.
”, the signal inverted to “L” by the inverter 65 is sent to the AND circuit 64 of the temperature control installation 63 of the switching room.
, and the ND circuit 64 outputs "L" regardless of the other input. Therefore, while the timer 62 is operating, that is, while the temperature compensating heater 9a is forcibly energized and performing a heating action, the transistor 46
is OFF, that is, the relay coil 46 is not energized, the relay contact 36 is open, and the solenoid 15 of the electric damper thermostat 13 in the switching chamber is not energized.

In other words, the damper □'-1e of the electric damper thermometer 13 is forcibly closed to prevent unnecessary cold air from entering from the duct 12 and to convect warm air generated by the heating action of the temperature compensation heater 9a. In order to prevent the temperature from flowing out due to the temperature inside the switching chamber 9, the temperature inside the switching chamber 9 rises extremely quickly from the freezing temperature range to the refrigeration or third temperature range. Then, after a predetermined period of time has elapsed, the timer 62 is reset and the output signal is inverted to "L#", so it is ORed.
The output of the circuit 61 also becomes "L". The output of the OR circuit is L
”, the transistor 57 is turned off, the relay coil 68 is de-energized, the relay contact 38 is opened, and the temperature compensation heater 9a stops generating heat. At the same time, the output “L” of the timer 62 is turned off by the inverter. “H” by 66
Then, one input of the AND circuit 64 of the switching room temperature control device 63 becomes "H". After that, OR circuit 4
Depending on the output of 8, the switching chamber 9 is guided to a normal cooling state.

Effects of the Invention As is clear from the above explanation, according to the present invention, even when the outside air temperature is higher than a predetermined value, the switching chamber is switched from the freezing temperature zone to the refrigeration or third temperature zone, and at the same time At the time of outside temperature, the temperature compensation heater is forcibly energized for a certain period of time to perform a heating action on the switching chamber. Also, during this time, the damper of the damper thermostat in the switching room is forcibly closed to prevent unnecessary cold air from flowing in and heated warm air from flowing out due to convection, thereby accelerating the heating action in the room and heating it extremely quickly in a short period of time. The temperature rises to the desired temperature range, and the practical effect is extremely large.

[Brief explanation of drawings]

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 a partially enlarged sectional view of the refrigerator shown in Fig. 2, Fig. 4 is a longitudinal sectional view of a conventional refrigerator, and Fig. 6 is a longitudinal sectional view of the refrigerator shown in Fig. 4. Partially enlarged sectional view of the refrigerator,
FIG. 6 is a control circuit diagram of the refrigerator shown in FIG. 4. 6...Cooler, 7...Blower, 8...
...Freezer room, 9...Switching room, 9a...
...Temperature compensation heater, 12...Duct, 13.
... Damper thermostat (electric damper thermo), 16 ... Damper, 30 ... Outside temperature detector, 47 ... Refrigeration selection switch, 6
o...Temperature compensation heater control device, 63...
...Temperature control device for switching room.

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 damper thermostat installed at the entrance of the switching chamber of the duct to adjust the required amount of cold air from freezing to refrigeration by electrical input; a refrigeration changeover switch for forcibly opening the damper of the damper thermostat; an outside air temperature detector for detecting outside air temperature; The refrigerator includes means for forcibly energizing the temperature compensating heater regardless of the outside temperature sensor for a certain period of time after the refrigeration changeover switch is released, and forcibly closing the damper of the damper thermostat during that time.