JPH06100412B2 - Refrigerator temperature control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal temperature control device for a refrigerator or the like that uses an electric damper device to control the internal temperature.

2. Description of the Related Art Hereinafter, a conventional refrigerator internal temperature control device such as a refrigerator will be described with reference to the drawings.

In the figure, 1 is a refrigerator, and air cooled by a cooler 3 housed in a cooling chamber 2 is blown by a blower 4 into a freezing chamber 5 and a refrigerating chamber 6
Circulate. Reference numeral 7 is a duct for guiding cold air to the refrigerating compartment 6, and 8 is an electric damper device for adjusting the refrigerating compartment temperature (hereinafter referred to as an electric damper device) arranged in the cool air discharge portion of the duct 7, which is provided on the damper base 8a and the damper base 8a. Connected to the retained solenoid 8b, the plunger 8c inserted in the center of the solenoid 8b, the blanker 8c, and the spring 8d and the plunger 8c attached to the damper base 8a, and rotates according to the reciprocating motion of the blanker 8c. Arm 8f that rotates about axis 8e and a baffle attached to the end of arm 8f
Composed of 8g. Reference numeral 9 is a rib attached to the peripheral portion of the cool air discharge port of the duct 7. Reference numeral 10 is an R thermistor installed in the refrigerating chamber 6 for detecting the temperature inside the refrigerator.

Reference numeral 11 denotes a thermostat arranged in the freezer compartment 5, which detects the temperature inside the freezer compartment 5 and controls the compressor 12 for cooling the refrigerant and the blower 4 to adjust the inside temperature of the freezer compartment 5. To do.

13 is an R comparator for controlling the electric damper device 8,
14a, 14b and 14c are fixed resistors connected to the R comparator 13. Reference numeral 15 is a variable resistor which is also connected to the R comparator 13 for controlling the internal temperature. 16 is the first transistor for current amplification, 17 is the solenoid 8b of the electric damper device 8.
It is a first relay that controls the energization to.

The operation of the in-compartment temperature adjusting device configured as described above will be described below.

First, the freezing compartment 5 and the refrigerating compartment 6 are cooled by sending the cool air cooled by the cooler 3 into the freezing compartment 5 and the refrigerating compartment 6 by the blower 4. To control the temperature inside the freezer compartment 5, the thermostat 11 detects the temperature inside the refrigerator, and when the temperature inside the chamber rises to the required cooling temperature, the compressor 12 and the blower 4 are operated, and when the temperature inside the chamber reaches the unnecessary cooling temperature, the compressor 12 and the blower 4 are stopped. On the other hand, refrigerator room 5
The inside temperature of the refrigerator is controlled by opening and closing the cold air discharge port of the duct 7 by the baffle 8g of the electric damper device 8.
First, the temperature inside the refrigerating chamber 6 is detected by the R thermistor 10 (the resistance value of the R thermistor 10 decreases as the temperature inside the refrigerator increases depending on the temperature inside the refrigerator). The output voltage of the R comparator 13 is changed by the change of the resistance value of the R thermistor 10, and the switching operation of the first transistor 16 operates the first relay 17 for controlling the energization of the solenoid 8b.

For example, the temperature inside the refrigerator requires cooling temperature (fixed resistors 14a, 14b, 14c
And set by the variable resistor 15), R
The output voltage of the comparator 13 becomes "High", the transistor 16 is turned on, the contacts in the first relay 17 are short-circuited, and the solenoid 8b
Is energized.

When the solenoid 8b is energized, the plunger 8c is attracted, the arm 8f rotates around the rotating shaft 8e, the baffle 8g separates from the rib 9, and the cool air discharge port of the duct 7 opens, whereby cool air flows into the refrigerating chamber 6. Then, the inside of the refrigerator compartment 6 is cooled.

When the temperature inside the refrigerator is lower than the unnecessary cooling temperature (determined by the fixed resistors 14a, 14b, 14c and the variable resistor 15), the output of the R comparator 13 becomes "Low" and the first transistor 16 turns off and the first relay 17 When the inner contact is opened, the solenoid 8b is not energized.

When the solenoid 8b is not energized, the spring 8d pulls the plunger 8c and the baffle 8g closes the cool air discharge port of the duct 7 so that cold air does not flow into the refrigerating chamber 6.

As described above, the inflow of cold air is controlled by the baffle 8g according to the temperature in the refrigerator to control the temperature in the refrigerator.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described method, when the cold air discharge port is blocked by the baffle 8g for a long time, there is no flow of cold air, so that the moist warm air in the refrigerating room 6 rises and the electric damper device is used. 8
Since it accumulates in the vicinity of the baffle and the inside of the duct 7 is cold due to cold air, frost adheres to the baffle 8g and the contact part between the baffle 8g and the rib 9 and freezes, and the operation of the baffle 8g becomes impossible. Had.

In view of the above problems, the present invention provides an internal temperature control device for a refrigerator or the like using an electric damper device so as to prevent the damper from freezing.

Means for Solving the Problems In order to achieve this object, the internal temperature control device for a refrigerator or the like according to the present invention forcibly opens the baffle for a certain period of time when the baffle of the electric damper device is closed for a certain period of time or more. And is configured to operate the blower.

Action With this configuration, stagnation of moist warm air around the electric damper device is removed and the damper is prevented from freezing.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In the figure, the same parts as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted. In the figure, reference numeral 18 denotes an F thermistor for detecting the temperature inside the freezing compartment 5 which is arranged inside the freezing compartment 5. 19 is R
The F comparator is connected to the thermistor 18, and outputs an output according to the resistance value of the F thermistor 18, that is, the temperature inside the freezer compartment 5.

Reference numerals 20a, 20b and 20c denote fixed resistors connected to the R comparator 19, and 21 denotes a variable resistor also connected to the R comparator 19.

Reference numeral 22 denotes a microcomputer, which outputs an output signal to the first transistor 16, the second transistor 24 and the third transistor 25 in response to inputs from the R comparator 13 and the F comparator 19.

The second transistor 24 is connected to a second relay 23 that turns the blower 4 on and off, and controls the blower 4 by an input from the microcomputer 22.

The third transistor 26 is connected to a third relay 25 that turns the compressor 12 on and off, and controls the compressor 12 by an input from the microcomputer 22.

If the input from the F comparator 19 is a "High" signal, the microcomputer 22 outputs a "High" signal to the second transistor 24 and the third transistor 26, and if the input from the F comparator 19 is a "Low" signal. For example, it is configured to output a "Low" signal to the third transistor 26, and when the input from the R comparator 13 is a "High" signal, outputs a "High" signal to the first transistor 16 to output the R comparator. When the input from 13 is a "Low" signal, the "Low" signal is output to the first transistor 16, but when the "Low" signal from the R comparator 13 is input, the "Low" signal is input. It is configured to count time and forcibly output a "High" signal to the first transistor 16 and the second transistor 24 when the time reaches a certain time (for example, 50 minutes) or more, for a certain time (for example, 3 minutes). Are

The operation of the inside temperature control device configured as described above will be described below.

First of all, regarding the temperature control in the freezer compartment 5, the F thermistor
The temperature inside the freezer compartment 5 detected by 18 (the higher the temperature inside the compartment, the lower the resistance value of the F thermistor) is the temperature required for cooling (fixed resistors 20a, 20b, 20c, variable resistor 21). ) Above, the output of the F comparator 19 becomes a "High" signal.

From the F comparator 19 to the microcomputer 22 "Hig
When the "h" signal is input, a "High" signal is output from the microcomputer 22 to the second transistor 24 and the third transistor 26. This turns on the second transistor 24 and the third transistor 26, and the second relay 23 and 3rd relay
The internal contacts of 25 are short-circuited respectively, and blower 4 and compressor 12
When the electricity is energized, cold air is sent into the freezing compartment 5 to cool the inside of the freezing compartment 5. When the temperature inside the freezer compartment 5 becomes lower than the unnecessary cooling temperature (determined by the values of the fixed resistors 20a, 20b, 20c and the variable resistor 21), the output of the F comparator 19 becomes a "Low" signal. When the “Low” signal is input from the F comparator 19 to the microcomputer 22, the “Low” signal is output from the microcomputer 22 to the second transistor 24 and the third transistor 26. As a result, the second transistor 24 and the third transistor 26 are turned off, and the second relay 23
The internal contacts of the third relay 25 and the third relay 25 are opened to stop the energization of the blower 4 and the compressor 12, so that the cooling of the freezer compartment 5 is stopped.

The temperature inside the freezer compartment 5 is adjusted by the above operation.

On the other hand, the internal temperature of the refrigerating room 6 is adjusted as follows.

In other words, the R comparator 13 is an R thermistor as in the conventional example.
When the temperature inside the refrigerator compartment 6 detected by 10 is higher than the required cooling temperature, a "High" signal is output, and when it is lower than the unnecessary cooling temperature, a "Low" signal is output.

The microcomputer 22 controls the electric damper device 8 by outputting it to the first transistor 16 and controlling the first relay 17 according to the input from the R comparator 13.

For example, in FIG. 4, the state of A is the relation between the operation of the electric damper device 8 and the inside temperature at a normal outside air temperature, for example, 20 ° C., and in this state, a “Low” signal from the R comparator 13 to the microcomputer 22. Output time 50
Since it is less than a minute, the "Low" output time from the microcomputer 22 to the first transistor 16, that is, the non-energization time (baffle 8a closed state time) to the solenoid of the electric damper device 8 is also less than 50 minutes, so the electric damper device 8 Performs the same operation as the conventional example.

Next, in the state of B, when the refrigerating room unnecessary cooling time is long at a low outside temperature (for example, 0 ° C.), that is, the “Low” signal output time from the R comparator 13 is long and the solenoid 8b of the electric damper device 8 is not energized. This is the case when the closed state time of the baffle 8g is, for example, 50 minutes or more.

In such a case, in the conventional example, the baffle 8g remained in the closed state until the temperature inside the refrigerating chamber 6 reached the required cooling temperature. "When the output time reaches 50 minutes, the microcomputer 22 outputs the" High "signal to the first transistor 16 and the second transistor 24 for 3 minutes. During that period, the switching operation of the first transistor 16 and the second transistor 24 connects the contacts inside the first relay 17 and the second relay 23 to energize the solenoid 8b and the blower 4, and the baffle 8g is opened. The blower 4 is operated. The time during which the baffle 8g is forcibly opened is such a short time that the effect on the temperature inside the refrigerator is small.

As described above, according to this embodiment, the microcomputer 22
Counts the blockage time of the baffle 8g with the microcomputer that the baffle 8g has been blocked for a certain period of time.
The baffle 8g is opened for a certain period of time by a signal from 22 and the blower 4 is operated to periodically perform duct 7 operation.
To prevent frost from forming on the baffle 8g and the contact portion between the baffle 8g and the rib 9 by freezing stagnation of the warm warm air from the inside of the refrigerating chamber 6 around the electric damper device 8 by flowing the cool air from the inside. Can be done.

In this embodiment, an example in which an electromagnetic solenoid is used as the electric damper device has been shown, but a motor, a stepping motor, or the like may be used instead.

As described above, according to the present invention, when the baffle of the electric damper device is in the closed state for a certain period of time or more, the baffle is forcibly opened for a certain period of time, and at the same time, the blower is forcibly operated to periodically cool the air. By causing the electric damper device to flow into the refrigerator, it is possible to prevent the electric damper device from being inoperable due to freezing of the baffle.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention,
2 is an enlarged cross-sectional view of a main part of the electric damper device, FIG. 3 is a schematic cross-sectional view of a refrigerator having the structure of the main part of FIG. 2, and FIG. 4 is an operation explanatory view of the electric damper device of FIG. FIG. 5 is a schematic sectional view of a refrigerator showing a conventional example, FIG. 6 is an enlarged sectional view of an essential part of an electric damper device provided in the refrigerator of FIG. 5, and FIG.
It is a control circuit diagram in the refrigerator of the figure. 4 ... Blower, 8 ... Electric damper device, 8g ... Baffle.

Claims (1)

[Claims] 1. A temperature inside the refrigerator is detected, and when the temperature inside the refrigerator exceeds a certain temperature, a baffle is opened to let cold air flow into the refrigerator.
An electric damper device is provided to close the baffle when the temperature inside the storage chamber falls below a certain temperature and stop the inflow of cold air into the storage. When the baffle is closed for a certain period of time or more, the baffle is forcibly opened for a certain period of time. A refrigerator internal temperature control device that is characterized by operating a blower together with it.