JPS60200069A - Controller for temperature of refrigerating chamber of freezing 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 Field of the Invention The present invention relates to a refrigerating room temperature control device for a refrigerator-freezer, which is equipped with a damper opening/closing control device that uses electrical input to adjust the amount of cold air into the refrigerating room.

Conventional configuration and its problems A conventional example will be explained with reference to FIGS. 1 to 3.

Reference numeral 1 designates a refrigerator main body, which is divided by a partition wall 2 into a freezing compartment 3 at the top and a refrigerator compartment 4 at the bottom. 05 is a cooler for the refrigeration cycle, and 6 is a blower for forced ventilation.
located within. Reference numeral 7 denotes a temperature detector for the freezer compartment, such as a thermistor, which detects the temperature of the freezer compartment 3.

Reference numeral 8 denotes a damper opening/closing device (hereinafter referred to as an electromagnetic damper) installed at the entrance of the refrigerator compartment to adjust the amount of cold air flowing in according to electrical input, and is composed of a solenoid 9 and a damper flap operated by the solenoid to open and close the cold air passage. Reference numeral 11 denotes a damper case, in which an air passage section 1181 is formed in the upper part and a mechanical part 11b is formed in the lower part. 12 is the damper flap 1
The damper case 1 is pushed up in the opening direction.
The inner center of the damper flap 10 is connected to a part of the lower surface of the damper flap 10, which passes through a part of the damper flap 10 and communicates with the air passage part 11a and the mechanical part 11b, and whose upper end is pivotally supported by the air passage part 11a. It is inserted into and moves up and down. Reference numeral 14 denotes a spring which normally biases the plunger 13 downward, and 16 a spring which biases the damper flap 10 in the closing direction. Reference numeral 16 denotes a temperature sensor for the refrigerator compartment such as a thermistor that detects the temperature of the refrigerator compartment 4. With this configuration, the cold air cooled by the cooler 5 is sent to the blower 6.
Forced ventilation is forced into the freezer compartment 3. Furthermore, cold air is introduced into the refrigerator compartment 4 via the electromagnetic damper 8.

Next, the electric circuit will be explained.

Reference numeral 17 denotes a compressor of the refrigeration cycle, which is connected in parallel with the blower 6 and then connected to a power source via a relay contact 18. The solenoid 9 of the electromagnetic damper 8 is connected in series with the relay contact 19 and then connected to both ends of the power source. 2o is a freezer temperature control device, which includes a temperature detector 7 such as a thermistor, resistors R1, R2, R3, a comparator circuit including a comparator 21, a transistor 22, and a relay coil 18'.
The output of the comparator 21 is connected to the base of the transistor 220. Also transistor 2
A suction relay coil 18' for opening and closing the relay contact 18 is connected to the collector No. 2. 23 is a damper opening/closing control device, which includes a temperature sensor 16 such as a thermistor for a refrigerator, resistors R4, R5, R6, a comparator 24, a transistor 25, and a relay coil 19'; the output of the comparator 24 is connected to the transistor 25; The collector of the transistor 26 has a suction relay coil 19' that opens and closes the relay contact 19.
is connected.

In such a configuration, when the temperature of the freezing compartment 3 is higher than a predetermined value during normal operation, the resistance value RTH of the temperature sensor 7 of the freezing compartment
becomes small, and the potential at point A determined by this resistance value RTH and resistor R1 becomes higher than the potential at point B determined by resistors R2 and R3, and the output of comparator 21 becomes "H".
o''7, the transistor 22 turns on and the relay coil 18' becomes conductive.Then, the relay contact 18 is closed and the compressor 17 and blower 6 are operated to cool the freezer compartment 3 and refrigerator compartment 4. After that, when the freezer compartment 3 is cooled to a certain temperature, the resistance value RTH of the temperature sensor 7 of the freezer compartment increases, and the A potential becomes smaller than the B potential, so the comparator 21 outputs a Low signal (hereinafter simply L). Therefore, the transistor 22 is turned off and conduction to the relay coil 18' is cut off, and the relay contact 18 is opened and the compressor 17 and the blower 6 are stopped. Regarding temperature control, if the temperature of the refrigerator compartment 4 is higher than a predetermined value, the resistance value RT of the temperature sensor 16 of the refrigerator compartment
H' becomes smaller and the potential at point 0 determined by RTH' and resistor R4 becomes higher than the potential at point D determined by resistors R5 and R6, and the output of comparator 24 becomes H'', so the transistor 26 is turned on.Then, the relay coil 19' becomes conductive, closing the relay contact, and the electromagnetic damper 8
Since the solenoid 9 is conductive, the tamper flap 1o is opened, and cold air flows into the refrigerator compartment 4 to cool it. After that, when the temperature of the refrigerator compartment 4 is cooled down to a constant temperature, the resistance RTH' of the temperature sensor 16 of the refrigerator compartment becomes large, and the C potential becomes smaller than the D potential, so the output of the controller 24 becomes '"L" and the transistor 25 is turned off.Then, the conduction to the relay coil 19' is cut off and the relay contact 19 is opened, so the conduction to the solenoid 9 is also cut off, the damper flap 1o is closed, and the refrigerator compartment 4 is closed. This prevents cold air from flowing into the refrigerator compartment 4. In this way, the temperature control of the refrigerator compartment 4 is independent of the temperature control action of the freezer compartment 3, and is controlled independently.This action is then repeated to perform the normal cooling action. It is something.

However, in this way, the temperature signal detected by the refrigerator temperature sensor 16 causes the damper flap 1 of the electromagnetic damper 8 to
When controlling the opening/closing amount of rJ:, the damper flap 10 is opened and closed within a fixed temperature range regardless of changes in outside temperature conditions, so the lower the outside temperature is, the more the refrigerator Since the amount of heat absorption load penetrating into the main body 1 also decreases, the balance between the required amount of cooling with respect to the amount of heat absorption is lost, resulting in a supercooled state. For example, when the outside air temperature is about 0 to 5 degrees Celsius, Even in the case where the original function of a refrigerator room can be performed even without a cold air supply, the indoor temperature of the refrigerator room 4 becomes negative temperature because the cold air is supplied to the refrigerator room 4, and the food in the room 9 freezes. There was this inconvenience.

OBJECT OF THE INVENTION In view of the above-mentioned points, an object of the present invention is to prevent freezing inside a refrigerator compartment at low outside temperatures.

Structure of the Invention In order to achieve this object, the present invention prevents the inside of a refrigerator compartment from being unnecessarily cooled by forcibly closing a damper for regulating the amount of cold air inflow under low outside temperatures. It is intended to prevent

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 4 to 6. Incidentally, the same components as those in the prior art are given the same reference numerals, and detailed explanation thereof will be omitted.

23' is a damper opening/closing control device, which biases the refrigerator compartment temperature sensor 16, resistors R4, R5, R6, comparator 24, A N D circuit 26, transistor 26, and relay coil 19', and controls the output of the comparator 24. is AN
It is connected to one input of the D circuit 26. 27 is an outside air temperature detection device, which includes a temperature sensor 28 and resistors R7, R8, and R9.
, a comparator 29, and the output of the comparator 29 is connected to the other input of the AND circuit 26. The output of the AND circuit 26 is connected to the base of a transistor 25, and the collector of the transistor 25 is connected to an attraction relay coil 19' for opening and closing the relay contact 19.

Note that the resistances R7, R8°R9 of the outside air temperature detection device 27
The resistance value setting for comparator 2 is set when the outside temperature is approximately 5℃ or less.
It is determined that the output of 9 is inverted to H-+L.

Next, the operational status of this configuration will be explained.

Note that the cooling operation of the freezer compartment during normal operation is the same as the conventional one, and the explanation thereof will be omitted, and the cooling operation of the refrigerator compartment will be explained. When the outside air temperature is approximately 5° C. or higher and the temperature of the refrigerator compartment 4 is higher than a predetermined value, the resistance value RTH' of the refrigerator compartment temperature sensor 16 of the damper opening/closing control device 23' is small, and RT
The potential at point 07 determined by H' and R4 is
Comparator 2 becomes higher than the potential at point D determined in step 6.
Since the output of 4 reaches "H", one input of the AND circuit 26 becomes "H". In addition, since the outside air temperature is approximately 5° C. or higher, the resistance value RT of the temperature sensor 28 of the outside air temperature detection device 27
H" has become small, and the potential at point E, determined by RTH" and R7, is higher than the potential at point F, determined by resistors R8 and R9, and the output of comparator 29 becomes '°H'. Therefore, the other input of the AND circuit 26 is also "
Therefore, the output of the AND circuit 26 is “H”.
”, the transistor 25 turns on.Then, the relay coil 19' conducts and closes the relay contact 19, so the solenoid 9 of the electromagnetic damper 8 is energized.Solenoid 9
When the plunger 13 is energized, the plunger 13 inserted in the center is pushed up to one side by electromagnetic action, compressing the spring 14 and pushing up the rod 12, opening the damper flap 10 in contact with the rod 12 and releasing the cold air. A road portion 11a is formed. As a result, the cold air generated by the cooler 5 is supplied to the inside of the refrigerator compartment 4 by the forced ventilation blower 6 for cooling. After that, when the temperature of the refrigerator compartment 4 is cooled down at a constant temperature, the resistance value RTH' of the temperature sensor 16 of the refrigerator compartment becomes large.
Since the C potential is smaller than the D potential, the comparator 24
Since one input of the AND circuit 26 becomes "L", the output of the AND circuit 26 becomes "L", and the output of the transistor 25 becomes "L", which is related to the other input.
FF. Therefore, the relay coil 19' is disconnected, the relay contact 19 is opened, and the energization to the solenoid 9 of the electromagnetic damper 8 is also stopped. When the energization to the solenoid 9 is stopped, the force pushing the plunger 13 upward is eliminated, the plunger 13 falls downward together with the restoring action of the spring 14, and the rod 12 is also pulled down. When the rod 12 is no longer pushed up, the damper flap 10 is pulled down together with the tensile action of the spring 15, and the cold air passage 11a is closed, thereby blocking the cold air from flowing into the refrigerator compartment 4. Thereafter, this action is repeated to perform a normal cooling action.

Next, a case where the outside air temperature drops to approximately 5° C. or lower will be described.

When the outside air temperature decreases, the resistance value RTH" of the temperature sensor 28 of the outside air temperature detection device 27 increases, and when it further decreases to approximately 5 degrees Celsius or less, the potential at point E determined by RTH" and the resistor R7 increases. Since it becomes lower than the potential of point F determined by R9 and the output of the comparator 29 becomes "L", one input of the AND circuit 26 becomes "L" and is unrelated to the other input (the output of the AND circuit 26 becomes "L"). As a result, the transistor 25 is turned off.Therefore, the relay coil 19' is cut off from conduction, the relay contact 19 is opened, and the energization to the solenoid 9 of the electromagnetic damper 8 is also stopped.

When the energization to the solenoid 9 is stopped, the damper flap 10 is pulled down and the cold air passage section 11a is closed, thereby blocking the inflow of cold air into the refrigerator compartment 4. As a result, the outside temperature was approximately 5
It is possible to prevent the food inside from freezing due to unnecessary overcooling of the refrigerator compartment 4 when the outside temperature is low, such as when the temperature is below .degree.

Effects of the Invention As is clear from the above configuration, the present invention includes a damper opening/closing device that adjusts the amount of cold air flowing into the refrigerator compartment inlet of a forced ventilation type refrigerator-freezer by electrical input, and a part of the outer shell of the main body that controls the temperature of the outside air. The device is equipped with an outside air temperature detection device that detects the outside air temperature, and is configured to forcibly close the damper flap of the damper opening/closing device when the outside air temperature is low. Since there is no unnecessary flow of cold air into the refrigerator room under the outside temperature and supercooling, it is possible to guarantee that food inside the refrigerator room does not freeze up to the outside air temperature of 0°C, and is suitable for use in cold regions and winters. Its effectiveness is extremely high when it is put into practical use.

[Brief explanation of drawings]

Figure 1 is a sectional view of a conventional refrigerator, and Figure 2 is a cross-sectional view of a conventional refrigerator.
3 is a control circuit diagram of FIG. 1, FIG. 4 is a sectional view of a refrigerator showing an embodiment of the present invention, and FIG. 5 is a damper opening/closing device of FIG. 4. cross-sectional view of the device,
FIG. 6 is a control circuit diagram of FIG. 4. 5...Cooler, 6...Blower, 10.
... Damper flap, 23'... Damper opening/closing control device, 27... Outside air temperature detection device. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram 2 Diagram 1 Kuro Diagram 4

Claims (1)

[Claims] A blower that circulates air cooled by a cooler installed in the cooling room to the freezer and refrigerator compartments, a damper opening/closing control device that uses electrical input to adjust the amount of cold air to the refrigerator compartment, and an outside air temperature sensor that detects the outside air temperature. A refrigerating room temperature control device for a refrigerator-freezer, comprising: a device for forcibly closing a damper flap of the damper opening/closing control device when the outside air temperature detection device detects a low outside air temperature.