JPH073305B2 - refrigerator - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention is of a forced draft type, and includes at least a freezer and
The present invention relates to a refrigerator provided with a switching chamber that can switch between freezing and refrigeration or a third temperature zone, and a damper thermostat that uses an electric input to adjust the amount of cold air to the switching chamber.

2. Description of the Related Art A conventional example will be described with reference to FIGS. In the figure, 1 is a refrigerator main body, an outer box 2, an inner box 3 and both boxes 2, 3
The heat insulating material 4 is filled in between. Reference numeral 5 is a first partition wall, inside which a cooler 6 and a blower 7 for forced ventilation are provided.
A freezing chamber 8 is formed in the upper part, and a switching chamber 9 in which the temperature can be switched between the freezing and refrigerating or the third temperature zone is formed in the lower part. The 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 is a duct for guiding the cool air cooled by the cooler 6 to the freezer compartment 8, the switching compartment 9, and the refrigerating compartment 11 by the blower 7, and an electrical input is made to the inlets of the switching compartment 9 and the refrigerating compartment 11. Damper thermostats 13 and 14 (hereinafter, referred to as electric damper thermostats 13 and 14) that adjust the amount of cold air inflow are provided respectively. Of these, taking the electric damper thermostat 14 for the refrigerating room as an example, the details thereof will be described. Reference numeral 15 is a solenoid, and 16 is a damper which is operated by the solenoid 15 to open and close the cold air passage. Reference numeral 17 is a damper case, in which an air passage portion 18 is formed in the upper portion and a mechanical portion 19 is formed in the lower portion. Reference numeral 20 is a rod that pushes up the damper 16 in the opening direction, penetrates a part of the damper case 17 and communicates with the air passage portion 18 and the machine portion 19, and the tip thereof is axially supported by the air passage portion 18. Further, it is in contact with a part of the lower surface of the damper 16a. 21 is a plunger joined to the rod 20,
It is inserted into the inner core of the solenoid 15 housed in 19 and moves up and down. 22 is a spring, normally a plunger
It is urged to push down 21. Also, 23 is a damper
A spring that biases 16 in the closing direction. The solenoid 15a and the damper 16a of the electric damper thermostat 13 for the switching chamber are also distinguished from each other in the description, but the structure including them is exactly the same.

Next, 24 and 25 are control panels for accommodating the electric damper thermostats 13 and 14, respectively, and the control panel 24 has a cool air discharge air passage 27 formed of a heat insulating material 26, and the control panel 25 has a heat insulating material 28. Cold air discharge air passages 29, 30 are provided. Further, reference numerals 31, 32 and 33 are temperature detectors such as thermistors provided in the freezing compartment 8, the switching compartment 9 and the refrigerating compartment 11, respectively.

Next, the control circuit will be described.

A refrigerating cycle compressor 34 is connected in parallel with the blower 7 and then connected to a power source via a relay contact 35. And solenoid 15a of electric damper thermostat 13 for switching room
Are connected in series with relay contacts 36 and then connected to the power supply. Further, 15 is a solenoid of the electric damper thermostat 14 for the refrigerating room, which is connected in series with the relay contact 37 and then connected to the power source.

38 is a freezer temperature control device, which is a temperature detector such as a thermistor.
The circuit includes a reference circuit 31, a resistor R ₁ , R ₂ , R ₃ , a comparison circuit including a comparator 39, a transistor 40, and a relay coil 41, and the output of the comparator 39 is connected to the base of the transistor 40. Further, the collector of the transistor 40 has the relay coil 41 for attraction for opening and closing the relay contact 35.
Are connected.

42 is a switching room temperature control device, which is a temperature detector such as a thermistor.
32, resistors R ₄ , R ₅ , R ₆ , a comparison circuit including a comparator 43, a transistor 44, a relay coil 45, a refrigeration changeover switch 46, and an OR circuit 47, and the output of the comparator 43 is the refrigeration changeover. The output of the OR circuit 47 is connected to the output of the switch 46 together with the output of the OR circuit 47, the output of the OR circuit 47 is at the base of the transistor 44, and the collector of the transistor 44 is provided with a suction relay coil 45 for opening and closing the relay contact 36. Each is connected.

48 is a refrigerating room temperature control device, which is a temperature detector such as a thermistor.
33, resistors R ₇ , R ₈ , R ₉ , a comparison circuit including a comparator 49, a transistor 50, and a relay coil 51. The output of the comparator 49 is connected to the base of the transistor 50 and the collector of the transistor 50. The relay coil 51 for suction that opens and closes the relay contact 37 is connected to.

In such a configuration, when the temperature of the freezer compartment 8 is higher than a predetermined value, the resistance value R _TH1 of the temperature detector 31 in the freezer compartment is small, and A is determined by the resistance value R _TH1 and the resistance R _1. Since the potential of the point becomes higher than the potential of the point B determined by the resistors R ₂ and R ₃ , the output of the comparator 39 becomes “High” (hereinafter referred to as “H”), so that the transistor 40 is turned on and the relay coil is turned on.
41 conducts. Then, the relay contact 35 is closed to close the compressor.
34 and the blower 7 are operated to cool the freezing compartment 8, the switching compartment 9 and the refrigerating compartment 11. After that, if the freezer compartment 8 is cooled to a predetermined temperature, the resistance R _TH1 of the temperature detector 31 in the freezer compartment increases, and the A potential becomes smaller than the B potential, so that the comparator 39 is "Low" (hereinafter "L"). Signal).
Therefore, the transistor 40 is turned off, the conduction to the relay coil 41 is cut off, the relay contact 35 is opened, and the compressor 34,
The blower 7 stops.

On the other hand, regarding the temperature control of the switching chamber 9, normally, when the temperature of the switching chamber 9 is higher than a predetermined value, the resistance value R _TH2 of the temperature detector 32 of the switching chamber is small, and the resistance value R _TH2 The potential at the point C determined by the resistor R ₄ and the resistance R ₄ becomes higher than the potential at the point D determined by the resistors R ₅ and R ₆ , and the output of the comparator 43 becomes “H”, so that the other input of the OR circuit 47 is input. OR circuit regardless of
The output of 47 also becomes "H" and the transistor 44 turns on. Then, the relay coil 45 conducts, the relay contact 36 is closed, and the solenoid 15a of the electric damper thermostat 13 for the switching chamber conducts, so that the damper 16a is opened and cold air flows into the switching chamber 9 to be cooled. After that, if the temperature of the switching chamber 9 is cooled to a predetermined temperature, the resistance R _TH2 of the temperature detector 32 in the switching chamber becomes large and the C potential becomes smaller than the D potential, so that the output of the comparator 43 is "L". Becomes At this time, the freezing changeover switch 46 is not turned on and its output is "L", so that the inputs of the OR circuits 47 are all "L" and their outputs are "L", and the transistor 44 is turned off. Then, since the conduction to the relay coil 45 is cut off and the relay contact 36 is opened, the conduction to the solenoid 15a is also cut off and the damper 16a is closed to prevent the cold air from flowing into the switching chamber 9. The above operation is repeated to maintain the switching chamber 9 in the refrigerating state (0 to 10 ° C) or the third temperature zone (for example, -3 to 0 ° C).

On the other hand, regarding the temperature control of the switching chamber 9 when the freezing changeover switch 46 is turned on, the freezing changeover switch 46 is turned on.
Then, the output becomes "H", the output of the OR circuit 47 becomes "H" regardless of the other input, the transistor 44 is forcibly turned on, and the relay coil 45 becomes conductive,
The relay contact 36 is closed and the solenoid 15a of the electric damper thermostat 13 is turned on. Then, while the damper 16a is opened and the freezing changeover switch 46 is turned on into the changeover chamber 9, a large amount of cold air is continuously fed to maintain the changeover chamber 9 at the freezing temperature.

In addition, regarding the temperature control of the refrigerating compartment 11 during this period,
If the temperature of R _TH3 is higher than the predetermined value, the resistance R _TH3 of the temperature detector 33 provided in the refrigerating compartment 11 is small, and R _TH3 and R ₇
The potential at the point E determined by and becomes higher than the potential at the point F determined by the resistors R ₈ and R _9, and the output of the comparator 49 becomes “H”, so that the transistor 50 is turned on. Then, the relay coil 51 conducts, the relay contact 37 closes, and the solenoid 15 of the electric damper thermostat 14 for the refrigerating compartment conducts, so that the damper 16 is opened and cold air flows into the refrigerating compartment 11 to be cooled. After that, when the temperature of the refrigerating compartment 11 is cooled to a predetermined temperature, the resistance R _TH3 of the temperature detector 33 provided in the refrigerating compartment 11 increases and the E potential becomes smaller than the F potential, so that the output of the comparator 49 is output. Goes "L" and transistor 50 is off
To do. Then, since the conduction to the relay coil 51 is cut off and the relay contact 37 is opened, the conduction to the solenoid 15 is also cut off and the damper 16 is closed to prevent the cold air from flowing into the refrigerating chamber 11. By repeating such actions, the refrigerating compartment 11 is maintained at a predetermined refrigerating temperature.

Problems to be Solved by the Invention However, regarding the temperature control of the refrigerating compartment 11, in such a configuration, the damper 16a of the electric damper thermostat 13 is always open when the refrigeration changeover switch 46 is turned on. The distribution of the amount of cool air sent from the duct 12 by the blower 7 is very large in the switching chamber 9, and conversely, in the refrigerating chamber.
The amount of cold air sent into 11 is relatively small, which causes a difference in the amount of cold air distributed to refrigerating chamber 11 when switching chamber 9 is refrigerated or set in the third temperature zone. On the other hand, the trackability of the indoor temperature with respect to the temperature detected by the temperature detector 33 becomes dull when the amount of supplied cold air becomes small. Therefore, in the refrigerating chamber 11, as compared with the case where the switching chamber 9 is refrigerated or set in the third temperature zone. When the temperature is set to be frozen, the amount of cold air supplied is small even if the temperature is controlled at the same detection temperature, that is, the room temperature becomes high, and the desired temperature cannot be obtained.

The present invention solves the above-mentioned problems, and an object thereof is to prevent an increase in the temperature of the refrigerating chamber when the freezing is set in the switching chamber.

Means for Solving the Problems In order to solve the above problems, the present invention is configured to lower the temperature setting of the temperature control device in the refrigerating compartment when setting the freezing in the switching compartment.

Operation According to the present invention, when the switching chamber is set to the freezing, the setting temperature of the refrigerating chamber is substantially lower than when the switching chamber is set to the refrigerating chamber or the third temperature zone.
The opening rate of damper thermostat in the refrigerating room (time ratio of opening per unit time) increases, and the distribution of cold air in the switching room and the refrigerating room in the duct does not change significantly even when the switching room is set to freezing. Is corrected to. Therefore, the refrigerating chamber temperature is maintained at a substantially predetermined temperature regardless of the temperature setting of the switching chamber.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. In addition, the same reference numerals are given to the same configurations as the conventional ones,
Detailed description thereof will be omitted and only different parts will be described.

In the figure, reference numeral 52 denotes a refrigerating compartment temperature control device, which includes a temperature detector 33 such as a thermistor provided in the refrigerating compartment, resistors R ₇ , R ₈ and R ₉
And a resistor 53 (resistance value R ₁₀ ) and a comparator 49 are provided with a comparator circuit, transistors 50 and 54, and a relay coil 51. The output of the comparator 49 is the transistor 50.
Connected to the base of. A collector relay coil 51 for opening and closing the relay contact 37 is connected to the collector of the transistor 50. Further, one end of a resistor 55 having a resistance value R ₁₀ is connected to the collector of the transistor 54, and the other end of the resistor 55 is connected to the resistors R ₈ and R ₉ of the comparison circuit of the refrigerating compartment temperature control device 52. It is connected to the point (point F). The output of the refrigeration selector switch 46 is connected to the base of the transistor 54, and when the transistor 54 is turned on, the resistor 55 (R ₁₀ ) and the resistor R ₉ form a parallel resistor.

In such a configuration, when the temperature of the switching chamber 9 is set to refrigeration or the third temperature zone, that is, when the freezing changeover switch 46 is not turned on, the output of the freezing changeover switch 46 is "L", and therefore the transistor 54 is OFF, the resistor 55 is not conducting, and the refrigerating compartment 11 is cooled by the same operation as the conventional one. That is, when the temperature of the refrigerating compartment 11 is higher than the predetermined value, the resistance value R _TH3 of the temperature detector 33 provided in the refrigerating compartment 11 is small and is determined by the resistance value R _TH3 and the resistance R _7. The potential at the point E becomes higher than the potential at the point F determined by the resistors R ₈ and R _9, and the output of the comparator 49 becomes “H”, so that the transistor 50 is turned on. Then, the relay coil 51 conducts to close the relay contact 37 and the solenoid 15 of the electric damper thermostat 14 for the refrigerating compartment conducts, so that the damper 16 is opened and cold air flows into the refrigerating compartment 11 to be cooled. . afterwards,
When the temperature of the refrigerator compartment 11 is cooled to a predetermined temperature, the resistance value R _TH3 of the temperature detector 33 increases and the E potential becomes smaller than the F potential, so the output of the comparator 49 becomes “L”,
The transistor 50 turns off. Then, the conduction of the relay coil 51 is cut off and the relay contact 37 is opened, so that the conduction to the solenoid 15 is also cut off and the damper 16 is closed to prevent the cold air from flowing into the refrigerating chamber 11. By repeating such actions, the refrigerating compartment 11 is maintained at a predetermined refrigerating temperature.

Next, when the switching chamber 9 is set to the freezing setting, that is, when the freezing changeover switch 46 is turned on, the freezing changeover switch
Since the output of 46 becomes "H", the transistor 54 turns on. When the transistor 54 is turned on, the resistance 55 (R ₁₀ ) is turned on, and a parallel resistance of the resistances R ₉ and R ₁₀ is formed between the F point of the comparison circuit and the ground. The potential at the F point is the resistance R ₈ and the resistance R ₉ , R ₁₀ will be determined by the voltage division of the parallel resistance, Therefore, the potential at the point F becomes lower than in the conventional case. When the potential at the point F is lowered, the potential at the point E where the temperature of the temperature detector 33 is determined by the resistance value R _TH3 decreases than before not larger and the resistance value R _TH3 and the resistor R ₇ is above Therefore, the transistor 51 will not be turned off when the potential of the point F is lowered. In this way, the electric damper thermostat 14 of the refrigerating chamber 11 has a higher opening time ratio of the damper 16 than when the switching chamber 9 is refrigerated or set to the third temperature zone, and the switching chamber 9
It is corrected that the distribution of the amount of cold air in the switching chamber 9 is biased by freezing, and the rise of the stable temperature level of the refrigerating chamber 11 is prevented in advance.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the present invention, the temperature setting of the refrigerating compartment temperature control device is configured to decrease at the same time when the cooling air temperature distribution tends to be biased to the switching compartment with the switching compartment set to the freezing setting. Therefore, the opening time ratio of the damper thermostat in the refrigerating room increases, and it functions to correct the cold air amount distribution ratio with the switching chamber so that it does not fluctuate significantly. It does not rise unnecessarily, and the practical effect is extremely high.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention,
2 is a longitudinal sectional view of the refrigerator, FIG. 3 is a partially enlarged sectional view of the refrigerator of FIG. 2, FIG. 4 is a longitudinal sectional view of a refrigerator showing a conventional example, and FIG. Partially enlarged sectional view of the refrigerator,
FIG. 6 is a control circuit diagram of the refrigerator shown in FIG. 6 ... Cooler, 7 ... Blower, 8 ... Freezer room, 9 ... Switching room, 11 ... Refrigerator room, 12 ... Duct, 13,14 ... Damper thermostat (electric damper thermo), 16a, 16 ......
Damper, 46 ... Refrigeration changeover switch, 52 ... Refrigerator temperature control device.

Claims (1)

[Claims] 1. A freezing chamber, a refrigerating chamber, a switching chamber capable of switching the temperature between freezing and refrigerating or a third temperature zone, and cold air cooled by a cooler to the freezing chamber, the refrigerating chamber, and the switching chamber. A blower and duct for forced ventilation, a damper thermostat provided at the entrance of the refrigerating chamber and the switching chamber of the duct to adjust the amount of inflowing cold air by an electric input, and the damper thermostat according to the room temperature of the refrigerating chamber and the switching chamber Temperature control device for controlling the opening / closing of the damper, a freezing changeover switch for forcibly opening the damper thermostat damper in the switching chamber, and the temperature setting of the refrigeration room temperature control device is lowered when the freezing changeover switch is turned on. Refrigerator equipped with a means.