JPS62206362A - 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 main body, an outer box 2, an 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 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 compensation heater provided at the bottom of the first partition wall 6 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 the cold air cooled by the cooler 6 to the freezing compartment 8, switching compartment 9, and refrigerator compartment 11 using the blower 7, and an electrical input is provided at the entrance of the switching compartment 9 and the refrigerator compartment 11. (damper thermomostara) that adjusts the amount of cold air inflow according to the
13 and 14 (hereinafter referred to as electric damper thermos 13 and 14) are provided, respectively. 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 operates to open and close the cold air passage. 1
Reference numeral 7 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. A plunger 21 is connected to the rod 2o, and is inserted into the inner core of the solenoid 16 housed in the mechanical part 19, and is movable up and down. 2
Reference numeral 2 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 solenoid 15a and the damper 16a will be distinguished for the sake of explanation regarding the electric damper thermometer 14 for the refrigerator compartment, but the structure including the others is completely the same.

Next, reference numerals 24 and 25 are control panels that respectively control the electric damper thermos 13 and 14. 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 heat insulating material 28. A cold air discharge air passage 29 is provided. Further, 3o is provided in a part of the outer shell of the main body 1, and outdoor temperature detectors 31, 32 and 33, such as thermistors, are installed in the freezer compartment 8, respectively, to detect the outside temperature.
This is a temperature detector such as a thermistor provided in the switching chamber 9 and 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.

Reference numeral 39 denotes a freezer temperature control device, which includes a temperature detector 31 such as a thermistor, resistors R1, R2, R3, a comparator circuit including a comparator 4o, a transistor 41, and a relay coil 42, and the output of the comparator 4o is connected to a transistor. Connected to 410 pace. Also, transistor 4
The relay coil 42 for suction, which opens and closes the relay contact 36, is connected to the first collector.

43 is a switching room temperature control device, which includes a temperature detector 32 such as a thermistor, resistors R4, R6, R6, a comparator circuit including a comparator 44, a transistor 46, and a relay coil 46.
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. Further, a suction relay coil 46 for opening and closing the relay contact 36 is connected to the collector of the transistor 46, respectively.

Reference numeral 49 denotes a refrigerator temperature control device, which includes a temperature detector 33 such as a thermistor, resistors R7, R8, R9, a comparator circuit including a comparator 60, a transistor 51, and a relay coil 62.
The output of the comparator 5o is connected to the pace of the transistor 61, and the collector of the transistor 61 is connected to the relay coil 62 for suction that opens and closes the relay contact 37.

63 is a temperature compensation heater control device for the switching chamber 9, which includes an outside temperature sensor 30 such as a thermistor, resistors R4°, R11,
R1□, a comparison circuit including a comparator 54, an inverter 65, an AND circuit 66, a transistor 67, and a relay coil 68. and the comparator 6
The output obtained by inverting the output of refrigeration changeover switch 47 by inverter 66 is connected to the input of the AND circuit 66, together with the output obtained by inverting the output of refrigeration changeover switch 47 by inverter 59. The output of the AND circuit 66 is connected to the base of the transistor 57, and the collector of the transistor 57 is connected to a suction relay coil 58 for opening and closing the relay contact 38, respectively.

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 is determined by resistors R2 and R3.
It becomes higher than the potential at the point, and the output of comparator 4Q becomes 'Hi'.
gh” (hereinafter referred to as “H”), the transistor 41 turns on and the relay coil 42 becomes conductive.Then, the relay contact 36 is closed and the compressor 34 and the blower 7 are operated, and the freezer compartment 8 and The switching compartment 9 and the refrigerator compartment 11 are cooled.After that, when the freezing compartment 8 is cooled to a predetermined temperature, the resistance RTH1 of the temperature sensor 31 of the freezing compartment becomes weak.
Since the A potential is smaller than the B potential, the comparator 40
generates a "Low" (hereinafter referred to as @I L jl) signal. Therefore, the transistor 41 is turned off and conduction to the relay coil 42 is cut off, and the relay contact 35 is opened to open the compressor 34 and 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 "TH2" of the temperature sensor 32 of the switching chamber becomes small, and the resistance value RTH
2 and resistor R4 is the potential of the 0 point determined by resistor R5, R
6, and the output of the comparator 44 becomes "H", so the output of the OR circuit 48 also becomes "H" and the transistor 46 is turned on, regardless of the other input of the OR circuit 48. Then, the relay coil 46 becomes conductive, closing the relay contact 36, and the solenoid 16 of the electric damper thermometer 13 for heavy switching becomes conductive, so the damper 16
is opened and cold air flows into the switching chamber e to cool it down. After that, when the temperature of the switching chamber 9 is cooled down to a predetermined temperature, the resistance RTH2 of the temperature sensor 32 of the switching chamber increases, and C
Since the potential becomes smaller than the C potential, the comparator 44
The output becomes "L". At this time, the refrigeration selector switch 47
is not input and its output is L', so all inputs of the OR circuit 48 are "L" and its output is also 'L'.
Therefore, the transistor 46 is turned off. Then, conduction to the relay coil 46 is cut off and the relay contact 36 is opened, so that the conduction to the solenoid 15 is also cut off and the damper 16 is closed to prevent cold air from flowing into the switching room e. By repeating the above-mentioned actions, the switching chamber 9 is refrigerated (0 to 10
°C) or a third temperature range (for example, -3 to 0 °C).

On the other hand, regarding the temperature control of the switching chamber 9 when the refrigeration selector switch 47 is turned on, the refrigeration selector switch 47
When turned ON, its output becomes 1H" and the OR circuit 48
The output becomes H1 regardless of the other input, the transistor 46 is forcibly turned on, the relay coil 46 becomes conductive, the relay contact 36 is closed, and the solenoid 15 of the electric damper thermostat 13 is turned on. Conduct. While the damper 16 is opened and the refrigeration changeover switch 47 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 refrigerating 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 RTHs of the temperature sensor 33 provided in the refrigerator compartment 11 becomes small, and the resistance value RTH3 The potential at point E, which is determined by resistor R7, becomes higher than the potential at point F, which is determined by resistors R8 and R9, and the output of converter 50 becomes "H", so transistor 61 is turned on. . and relay fill 62
conducts and closes the relay contact 37, and the solenoid 15a of the electric damper (-thermo) 14 for the refrigerator compartment becomes conductive, so the damper 168 is opened and cold air flows into the refrigerator compartment 11 to cool it down. When the temperature of the refrigerator compartment 11 is cooled down to a predetermined temperature, a temperature detector 33 provided in the refrigerator compartment 11 is activated.
Since the resistor RTH3 becomes larger and the E potential becomes smaller than the F potential, the output of the converter 60 becomes L1 and the transistor 51 is turned off. Then, since the conduction to the relay coil 62 is cut off and the relay contact 37 is opened, the conduction to the solenoid 15a is also cut off and Danno<-
16a closes to prevent cold air from flowing into the refrigerator compartment 11. This action is repeated to maintain the refrigerator compartment 11 at a predetermined refrigeration temperature.

Next, temperature control of the switching chamber 9 when the outside air temperature drops below a predetermined low outside air temperature (for example, 10° C.) will be described. As the outside air temperature decreases, the amount of heat absorbed into the switching chamber 9 gradually decreases, and the amount of cold air required to obtain the desired indoor temperature also decreases, until cooling is maintained at a low temperature without the need to supply cold air. Heat is taken away by the chamber 6 and the duct 12, and the switching chamber 9 tends to be supercooled to below the desired temperature. 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 the resistor RTH4 and the resistor R1° is determined by the resistor R1° and the resistor R12. The potential of the H point is lower than that of the comparator 6.
The output of 4 becomes "L".

Therefore, one input of the AND circuit 66 is connected to the inverter 56.
This is the input converted to @H1. And at this time,
If the refrigeration selector switch 47 is not turned on, that is, if the setting of the switching chamber 9 is not refrigeration, the output is 'L', so it is converted to 'H#' by the inverter 69, and
The other input of the circuit 66 also becomes "H", and as a result, A
The output of the ND circuit 66 becomes "H", and the transistor 6
7 turns on. Then, the relay coil 68 passes through and closes the relay contact 38, and the temperature compensation heater 9a of the switching chamber 9
conducts and generates heat, heating the switching chamber 9 and maintaining it at an appropriate temperature to prevent overcooling. Note that when the outside air temperature is higher than a predetermined value, or when the refrigeration selector switch 47 is turned on, that is, when the refrigeration setting is set, the comparator 5
4. "H' ratio output inverter 5 of refrigeration selector switch 47
5゜59 is converted to ``1L'', so both are AN
One input of the D circuit 66 becomes @L'', the transistor 67 is not turned on, and therefore the aforementioned temperature compensation 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 10°C) or a third temperature range (e.g. -3 to 0°C). ), that is, when the refrigeration selector switch 47 is turned off, the indoor temperature is not raised by active heating means, and the insulating wall facing the high temperature part of the structure surrounding the switching chamber 9 is turned off. That is, the room temperature gradually rises due to natural heat absorption from the outside air and the heat insulating wall facing the refrigerator compartment 11, and it takes a considerable amount of time to reach the desired set temperature. The problem was 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 that, for a predetermined 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, It is configured to energize the temperature compensation heater for low outside temperatures in the switching room.

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 and reaches the desired temperature in a short time.At the same time, temperature compensation starts after a predetermined time has elapsed. The forced energization of the 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, 60 is a temperature compensation heater control device for the switching chamber 9, which includes an outside temperature sensor such as a thermistor and 30° resistors RR and R.
, a comparator 54, a comparison circuit, an inverter 56, an AND circuit 56, an OR circuit 61, a timer 62, a transistor 57, and a relay coil 68. Only for a certain period of time °゛H#H
#Output and automatically reset after a certain period of time"
The output of the comparator 64 is inverted by an inverter 65, and the output of the refrigeration changeover switch 47 is inverted by an inverter 69, and the output is connected to the input of the AND circuit 56. , the output of the AND circuit 56 is connected to the input of the OR circuit 61 together with the output of the timer 62.The output of the OR circuit 61 is connected to the base of the transistor 67, and the collector of the transistor 57 is connected to the relay. A suction relay coil 58 that opens and closes the contact 38 is connected.

In addition, an output obtained by inverting the output of the refrigeration changeover switch 47 by an inverter 59 is connected to the input of the timer 62. In this configuration, the outside air temperature reaches a predetermined temperature (for example, 1
0°C) and the switching chamber 9 has been used in the freezing setting and is switched to refrigeration or the third temperature zone, the freezing selection switch 47 is turned on until then and the output uH
'' continues to be generated, and due to the inverting action of the inverter 69, the input of the timer 62 is in the ``L#'' state, that is, one input of the OR circuit 61 becomes u L jl. On the other hand, since the outside air temperature is higher than the predetermined temperature, the potential at point G, which is determined by the resistance RTH4 and the resistance R1° of the outside air temperature detector 30 of the temperature compensation heater control device 60, is determined by the resistance R11 and the resistance R12. The potential is higher than the potential at point H where fusumaai is performed. That is, the output of the comparator 64 is "H", one input of the AND circuit 66 is "L#" due to the inverting action of the inverter 660, and at the same time, the output "H" of the refrigeration selector switch 47 is "L" due to the inverting action of the inverter 59. '', 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'', so the output of the OR circuit 61 becomes ``L'' and the transistor 57 is not 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 changeover switch 47 is released, the output becomes L'', and the inverter 59
The signal is inverted to 1H#, and the timer 62 starts accumulating time. During the time integration, the timer 62 continues to generate a 1H" output and continues to send the @H# signal to one input of the OR circuit 61. Therefore, the other input of the OR circuit 61 is "L". In other words, even if the outside temperature is higher than a predetermined value, the output of the OR circuit 61 generates @H'', the transistor 57 is ONL, the relay coil 58 is conductive, and the relay contact 38 is attracted, and the temperature is compensated. The heater 9a is energized.

Therefore, a heating action is performed on the switching chamber 9, and the temperature quickly reaches the refrigeration or third temperature range from the freezing temperature range. Then, after a predetermined period of time has elapsed, the timer 62 is reset and its output signal is inverted to 'L', so the output of the OR circuit 61 also becomes 'L', and the transistor 67 becomes 0FFL, and the output signal to the relay coil 68 is set to 'L'. The current supply stops, the relay contact 38 opens, and the temperature compensation heater 9
The heat generation of a stops and the state shifts to a normal cooling state.

Effects of the Invention As is clear from the above explanation, according to the present invention, even if the outside air temperature is higher than a predetermined value, the switching chamber can be switched from the freezing temperature zone to the refrigeration or third temperature zone at the same time. When the outside temperature is low, the temperature compensation heater is forcibly energized for a certain period of time to promote heating of the switching chamber, quickly raising the temperature within the room to the desired temperature range in a short period of time, and achieving stability. It has become possible, and its practical benefits are extremely significant.

[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, 16・・・・・・
Damper, 3o...Outside temperature sensor, 47...
...refrigeration changeover switch, 6o...temperature compensation heater control device.

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; A refrigerator comprising: a temperature compensation heater control device that forcibly energizes the temperature compensation heater regardless of the outside air temperature sensor for a certain period of time after the refrigeration changeover switch is released.