JPH076726B2 - refrigerator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a forced ventilation type refrigerator.

2. Description of the Related Art A conventional example will be described with reference to FIGS. 4 to 6. In the figure, 1 is a refrigerator body, and an outer box 2, an inner box 3, and both boxes
It is composed of a heat insulating material 4 filled between the two and three. 5
Is a first partition wall, in which a cooler 6 and a blower 7 for forced ventilation are housed, a freezing chamber 8 is provided at an upper part, and a freezing and refrigerating or a temperature changeover chamber 9 in a third temperature zone is provided at a lower part. To form a section. A second partition wall 10 is installed below the first partition wall 5 to partition 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 13 for the switching chamber as an example, the details will be described. Reference numeral 15 is a solenoid, and 16 is a damper that is operated by the solenoid 15 to open and close the cold air passage. Reference numeral 17 denotes a damper case, which has an air passage portion 18 on the upper portion and a mechanical portion 19 on the lower portion. 2
Reference numeral 0 denotes a rod that pushes up the damper 16 in the opening direction, which penetrates a part of the damper case 17 and causes an air passage portion 18 and a mechanical portion 19 to pass therethrough.
And a tip thereof abuts a part of a lower surface of the damper 16 whose upper end is axially supported by the air passage portion 18. Reference numeral 21 denotes a plunger joined to the rod 20, which is inserted into the inner core portion of the solenoid 15 housed in the mechanical portion 19 and is vertically movable. 22 is a spring, which normally urges the plunger 21 to be pushed downward. Reference numeral 23 is a spring that biases the damper 16 in the closing direction. The electric damper thermostat 14 for the refrigerating room also has a solenoid 15a and a damper 16a.
, But the structure is exactly the same including the others.

Next, reference numerals 24 and 25 are control panels for accommodating the electric damper thermostats 13 and 14, respectively. The control panel 24 has a cool air discharge air passage 27 formed by a heat insulating material 26, and the control panel 25 has a heat insulating material 28. Formed cool air discharge air duct 29,30
Is provided. In addition, 31, 32 and 33 are the freezing room 8 and the switching room respectively.
9. A temperature detector such as a thermistor provided in the refrigerator compartment 11.

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. The solenoid 15 of the electric damper thermostat 13 for the switching chamber is connected to the power source after being connected in series with the relay contact 36. Further, 15a 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 supply.

38 is a refrigeration temperature controller, which is a temperature detector such as a thermistor 3
1, a resistor R ₁ , R ₂ , R ₃ , a comparison circuit including a comparator 39, O
An R circuit 40, a transistor 41, and a relay coil 42 are provided. The output of the comparator 39 is connected to one input of the OR circuit 40, 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 35.

43 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 44 and an OR circuit 45, a transistor 46, a relay coil 47, and a freezing changeover switch 48. The outlet of the comparator 44 is connected to the inlet of the OR circuit 45 together with the output of the changeover switch 48, the outlet of the OR circuit 45 is connected to the base of the transistor 46, and the collector of the transistor 46 is opened or closed to the relay contact 36. Relay coils 47 for suction are connected to each other.

49 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 comparator circuit having a comparator 50, a transistor 51, and a relay coil 52 are provided, the outlet of the comparator 50 is connected to the base of the transistor 51, and the collector of the transistor 51 is provided. The relay coil 52 for suction that opens and closes the relay contact 37 is connected to the.

Reference numeral 53 is a quick freezing device, which is composed of a quick freezing switch 54 and a timer 55 that generates an output only for a certain time if there is an input. The outlet of the quick freezing switch 54 is connected to the input of the timer 55, and the outlet of the timer 55 is connected to one inlet of the OR circuit 40 of the freezer compartment temperature control device 38.

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. The potential of the point becomes higher than the potential of the point B determined by the resistors R ₂ and R ₃ , and the output of the comparator 39 becomes “High” (hereinafter referred to as “H”). Output is also "H"
Then, the transistor 41 turns on and the relay coil 42 becomes conductive. Then, the relay contact 35 is closed to operate the compressor 34 and the blower 7 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 value R _TH1 of the temperature detector 31 in the freezer compartment increases,
Since the A potential becomes smaller than the B potential, the comparator 39 generates a "LOW" (hereinafter referred to as "L") signal. here,
In the OR circuit 40 as well, the quick freezing switch 54 is not turned on and one input is at "L", so the output becomes "L", the transistor 41 is turned off, and the continuity of the relay coil 42 is cut off. The relay contact 35 opens and the compressor 34 and the blower 7
Stop.

On the other hand, regarding the temperature control of the switching chamber 9, when the temperature of the switching chamber 9 in the normal state is higher than a predetermined value, the temperature detector of the switching chamber 9
The resistance value R _{TH2 of} 32 is smaller, and the resistance value R _TH2
The potential at the point C determined by 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 44 becomes “H”.
Therefore, the output of the OR circuit 45 also becomes "H" regardless of the other input of the OR circuit 45, and the transistor 46 is turned on. Then, the relay coil 47 conducts to close the relay contact 36 and the solenoid 15 of the electric damper thermostat 13 for the switching chamber conducts, so that the damper 16 is opened and cold air flows into the switching chamber 9 to be cooled. After that, when the temperature of the switching chamber 9 is cooled to a predetermined temperature, the resistance value 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 44 becomes “L”. "It becomes. At this time, the freezing changeover switch 48
Is not turned on and its output is "L", so the OR circuit 45
Input becomes "L" and its output also becomes "L", and the transistor 46 is turned off. Then, since the conduction to the relay coil 47 is cut off and the relay contact 36 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 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 switch 48 is turned on, when the freezing switching switch 48 is turned on, the output becomes "H", and the output of the OR circuit 45 is the other input. Transistor becomes "H" regardless of
46 is forcibly turned on, the relay coil 47 conducts, the relay contact 36 closes, and the solenoid 15 of the electric damper thermostat 13 conducts. Then, while the damper 16 is opened and the freezing changeover switch 48 is turned on in 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 is higher than the predetermined value, the resistance value R _TH3 of the temperature detector 33 provided in the refrigerator compartment 11 is small and the resistance value R _TH3 is low.
The potential at the point E, which is determined by _TH3 and the resistance R ₇ , is the resistance R ₈ , R ₉
It becomes higher than the potential at the point F determined by and
Since the output of 50 becomes "H", the transistor 51 turns on. Then, the relay coil 52 conducts, the relay contact 37 closes, and the solenoid 15a of the electric damper thermostat 14 for the refrigerating compartment conducts, so that the damper 16a is opened and cold air flows into the refrigerating compartment 11 to be cooled. After that, if the temperature of the refrigerating compartment 11 is cooled to a predetermined temperature, the temperature detector 33 provided inside the refrigerating compartment 11
Since the resistance value R _TH3 of the transistor becomes large and the E potential becomes smaller than the F potential, the output of the comparator 50 becomes “L” and the transistor 51 is turned off. Then, since the conduction to the relay coil 52 is cut off and the relay contact 37 is opened, the solenoid
The conduction to 15a is also cut off, the damper 16a is closed, and the refrigerator compartment
Prevents the inflow of cold air into 11. By repeating such actions, the refrigerating compartment 11 is maintained at a predetermined refrigerating temperature.

Next, the operation of the quick freezing device 53 will be described. When the quick freezing switch 54 is turned on, its output becomes "H" and is input to the timer 55, and the timer 55 continues to generate "H" output for a predetermined time from that point. Therefore, the output of the OR circuit 40 of the freezer compartment temperature control device 38 becomes "H" regardless of the input from the one comparator 39, the transistor 41 is forcibly turned on, and the relay coil 42 becomes conductive. Then, the relay contact 35 is closed and the compressor 34 and the blower 7 are forcibly continuously operated, and the freezing chamber 8 is rapidly frozen. After that, when the timer 55 finishes integrating for a certain period of time, the output returns to "L" and one input of the OR circuit 40 goes to "L".
However, the resistance value R _TH1 of the temperature detector 31 is also sufficiently large because the temperature inside the freezer compartment 8 is extremely low due to the quick freezing action, and as a result, the output of the comparator 39 is “L”, that is, Since the other input of OR circuit 40 is also "L"
The output of the OR circuit 40 becomes "L". And the transistor 41
When it is turned off, conduction to the relay coil 42 is cut off, the relay contact 35 is opened, the compressor 34 and the blower 7 are stopped, and the quick freezing action is completed.

Problems to be Solved by the Invention However, when the compressor 34 and the blower 7 are continuously operated by the quick freezing action as described above, if the switching chamber 9 is not set to the freezing temperature, that is, the freezing changeover switch 48 is turned on. When the damper 16 of the electric damper thermostat 13 in the switching chamber is forcibly opened, the cooling air is continuously supplied to the switching chamber 9 simultaneously with the continuous cooling of the freezing chamber 8 by the quick freezing action. However, there is a problem in that the amount of cold air for the freezer compartment 8 originally required is insufficient and a sufficient quick 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 is also a problem of dew condensation on the outer shell in a humid environment due to deterioration of heat insulation and supercooling of the refrigerating chamber 11 at a low outdoor temperature. It was

The present invention is to solve the above problems, to improve the quick-freezing effect during the quick-freezing action when setting the freezing of the switching chamber, the condensation problem in the humid environment of the switching chamber outer shell and low outside temperature It aims to solve the problem of supercooling in the refrigerator room at the same time.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pattern in which a damper of a damper thermostat of a switching chamber during a rapid freezing operation is set in advance when a quick freezing operation is performed at the time of setting the freezing of the switching chamber. It is configured to control the opening and closing with time.

Operation According to the present invention, when the quick freeze operation is performed when the switching chamber is set to be frozen, the compressor and the blower are continuously operated to continuously send a large amount of cool air to the freezing chamber, but the damper is provided to the switching chamber. Since the damper of the thermostat is opened / closed appropriately in time based on a predetermined pattern, cold air is supplied to the switching chamber only when the damper is opened, and the switching chamber is not unnecessarily overcooled, and is also frozen by that amount. The amount of cold air to the room increases.

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 56 denotes a switching chamber temperature control device, which includes a temperature detector 32 such as a thermistor provided in the switching chamber 9 and resistors R ₄ , R ₅ and R ₆
And an OR circuit 45, a transistor 46, a relay coil 47 and a refrigerating selector switch 48, AND
A circuit 57 is provided, and the output of the comparator 44 is
To one input of the OR circuit 45, the refrigeration changeover switch 48
Is also connected to the other input of the OR circuit 45 via the AND circuit 57. The output of the OR circuit 45 is the transistor
A suction relay coil 47 for opening and closing the relay contact 36 is connected to the base of the transistor 46 and the collector of the transistor 46.

Reference numeral 58 is a quick freezing device, and a quick freezing switch 54, a timer 55 that keeps outputting “H” output for a certain period of time after the “H” input is input, and a “H” input within the time synchronized with the timer 55. It is composed of a timer 59, an inverter 60, and an OR circuit 61, which alternately repeat "H" and "L" outputs in a predetermined pattern. The outputs of the quick freezing switch 54 are connected to the timers 55 and 59 and the inverter 60, respectively, and the output of the timer 55 is the 0R circuit of the freezer compartment temperature control device 38.
The output of the timer 59 and the output of the inverter 60 are both connected to one input of 40 and the input of the OR circuit 61. Also, OR
The output of the circuit 61 is the AND circuit 57 of the switching chamber temperature control device 56.
Connected to one input.

In such a configuration, when the switching chamber 9 is set to be frozen,
When the freezing changeover switch 48 is turned on, its output becomes "H".
One input of the AND circuit 57 becomes “H.” At this time, if the quick freezing device is not being operated, the output of the quick freezing switch 54 of the quick freezing device 58 is “L”, which is inverted by the inverter 60 and ORed. One input of the circuit 61 is "H".
Therefore, the output of the OR circuit 61 is also "H" and the AND circuit 57
Normally, the other input of the AND circuit 57 is "H". Normally, when the refrigeration selector switch 48 is turned on, the output of the AND circuit 57 is "H", that is, one input of the OR circuit 45 is "H". Transistor 46 turns on, relay coil 47 conducts, and relay contact 36
Close. Then, the solenoid 15 is energized to open the damper 16 of the electric damper thermostat 13, and a large amount of cool air is taken into the switching chamber 9 to be cooled to the freezing temperature.

Then, when the quick freezing operation is performed after setting the freezing temperature in the switching chamber in this manner, the output of the quick freezing switch 54 generates "H", and at the same time, the timers 55 and 59 start time integration. At this time, the timer 55 continues to generate “H” output for a certain period of time, so that one input of the OR circuit 40 becomes “H” during that time, the transistor 41 is turned on, the relay coil 42 is turned on, and the relay contact 35 is closed. . Then, the compressor 34 and the blower 7 are continuously operated to perform quick freezing action. On the other hand, at the same time, the output of the timer 59 alternately generates "H" and "L" outlets in a predetermined pattern during that time, so that the inverter 60
Since the output of the OR circuit 61 is "L", the output of the OR circuit 61 generates "H" only while the output of the timer 59 is "H". Is entered. Therefore, the output of the AND circuit 57 also generates "H" only while the output of the timer 59 is "H", and the transistor 46 also alternately turns ON and OFF temporally in accordance with this, via the OR circuit 45. Repeatedly, as a result, the damper of the electric damper thermostat 13 is controlled to open and close in time according to the output of the timer 59, and during this time, cold air is sent into the switching chamber 9 only during the period when the damper 16 is open. The chamber 9 is not supercooled.
Further, when the damper 16 is closed, a large amount of cold air is concentratedly supplied to the freezing compartment, and the quick freezing effect of the freezing compartment is enhanced.

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

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

(2) The switching chamber is not overcooled, and in a high humidity environment, it is possible to prevent the occurrence of a dew condensation problem due to a decrease in heat insulation around the switching chamber outer shell.

(3) The switching chamber is not supercooled, and the supercooling effect on the refrigerating chamber due to the deterioration of the heat insulating property can be suppressed especially at low outside air temperature.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention,
2 is a vertical sectional view of the same refrigerator, FIG. 3 is an enlarged sectional view of an essential part of the refrigerator shown in FIG. 2, FIG. 4 is a vertical sectional view of a refrigerator showing a conventional example, and FIG. Enlarged sectional view of the main part 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, 12 ... Duct, 13 ... Damper thermostat,
16 …… Damper, 34 …… Compressor, 48 …… Refrigeration changeover switch, 58 …… Quick freezing device.

Claims (1)

[Claims] 1. A freezing chamber, a switching chamber capable of temperature switching between freezing and refrigeration, or a third temperature zone, and a blower and a duct for forcedly ventilating the cool air cooled by a cooler into the freezing chamber and the switching chamber. , A damper thermostat provided at the inlet of the switching chamber of the duct to adjust the required amount of cold air from freezing to refrigeration by an electric input, a freezing changeover switch for forcibly opening the damper of the damper thermostat, a compressor and the A refrigerator comprising a blower forcibly operating a blower for a certain period of time, and a quick refrigerating device that controls opening / closing of a damper of the damper thermostat when the refrigeration changeover switch is turned on.