JPS61213573A - Temperature regulator for inside of box of 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 temperature control device for a refrigerator or the like that uses an electric damper device to control the temperature inside the refrigerator.

2. Description of the Related Art Hereinafter, a conventional temperature control device for a refrigerator or the like 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 room 2 is passed through a blower 4 to a freezer room 6 and a refrigerator room 6.
circulate. 7 is a duct that guides cold air to the refrigerator compartment 6; 8 is an electric damper (device (hereinafter referred to as an electric damper device) for adjusting the temperature of the refrigerator compartment disposed at the cold air discharge part of the duct 7; a damper base 8a; a damper base 8a; The solenoid 8b held in
An arm 8f and an arm 8 that are connected to C and rotate around a rotating shaft 8e in accordance with the reciprocating motion of the plunger 8C.
9 is a lip attached to the peripheral edge of the cold air outlet of the duct 7. 1o is a refrigerator installed in the refrigerator compartment e for internal temperature detection. This is the R thermistor.

Reference numeral 11 denotes a thermostat placed inside the freezer compartment 5, which detects the temperature inside the freezer compartment 5 and controls the compressor 1 for compressing refrigerant.
The internal temperature of the freezer compartment 5 is controlled by controlling the air conditioner 2 and the blower 4.

13 is an R comparator for controlling the electric damper device 8, and 14a, 14b, and 14c are fixed resistors connected to the R comparator 13. A variable resistor 15 is also connected to the R comparator 13 and is used to adjust the temperature inside the refrigerator.

16 is a first transistor for current amplification, and 17 is a first relay that controls energization to solenoid 8b of electric damper device 8.

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

First, the freezing compartment 6 and the refrigerator compartment 6 are cooled by sending cold air cooled by the cooler 3 into the freezer compartment 6 and the refrigerator compartment 6 using the blower 4. The temperature inside the freezer compartment 6 is controlled by detecting the temperature inside the freezer compartment 11. When the temperature inside the refrigerator rises to the temperature required for cooling, the compressor 12 and the blower 4 are operated. When the temperature inside the refrigerator reaches the unnecessary cooling temperature, the compressor 12 and the blower 4 are operated. This is done by stopping the air blower 12 and the blower 4. On the other hand, the temperature inside the refrigerator compartment 6 is controlled by the baffle 8 of the electric damper device 8.
This is done by opening and closing the cold air outlet of the duct 7 using q. First, the internal temperature of the refrigerator compartment 6 is detected by the R thermistor 10 (the resistance value of the R thermistor 1o becomes smaller as the internal temperature increases). A change in the resistance value of the R thermistor 1o causes a change in the output voltage of the R comparator 13, and a switching operation of the first transistor 16 causes a first relay 17 that controls energization to the solenoid 8b to operate.

For example, the temperature inside the refrigerator is the required cooling temperature (fixed resistance 14a).

14b, 14C and variable resistor 16)
, the output voltage of the R comparator 13 is at
gh”, transistor 16 turns on, and first relay 1
The contacts in 7 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 8q is separated from the lip 9, and the cold air outlet of the duct 7 is opened, causing cold air to flow into the refrigerator compartment 6. The inside of the refrigerator compartment 6 is cooled.

Cooling temperature that does not require internal temperature (fixed resistor 14a).

14b, 14C, and the variable resistor 15), the output of the R comparator 13 becomes "Low" and the first transistor 16 is turned off.The contact in the L first relay 17 is opened, so that the solenoid 8b is The power will no longer be turned on.

If the solenoid 8b is not energized, the plunger 8C is pulled by the spring 8d, the cold air discharge port of the duct 7 is closed by the baffle 8q, and the cold air does not flow into the refrigerator compartment 6.

As described above, the inflow of cold air is adjusted by the baffle 8q according to the temperature inside the refrigerator, thereby controlling the temperature inside the refrigerator.

Problems to be Solved by the Invention However, with the method described above, if the cold air outlet is blocked by the baffle 8q for a long time, there is no flow of cold air, and the humid warm air in the refrigerator compartment e rises, causing the electric damper device to #
8, and the inside of the duct 7 is at a low temperature due to cold air, so the baffle 8q and baffle 8q and lip 9
Frost adheres to the contact area with the baffle 8q, causing it to freeze.
This had the problem that it was impossible to operate.

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 Problem To achieve this object, the temperature control device for refrigerators, etc. of 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.

Function: This configuration removes stagnation of moist warm air around the electric damper device and prevents the damper from freezing.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

In the drawings, parts that are the same as those in the conventional example are given the same reference numerals and explanations will be omitted. In the figure, reference numeral 18 denotes an F thermistor disposed inside the freezer compartment 5 for detecting the temperature inside the freezer compartment 5. 19
is an F comparator connected to the R thermistor 18, and outputs an output according to the resistance value of the F thermistor 18, that is, the internal temperature of the freezer compartment 5.

20 i , 20b , 20c are R coyno<lator 19
A fixed resistor 21 is connected to the R connector 19, and a variable resistor 21 is also connected to the R connector 19.

22 is a microcomputer, which generates output signals to the first transistor 16, second transistor 24, and third transistor 25 based on inputs from the R/)(lator 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 based on input from the microcomputer 22 .

The third transistor 26 is connected to a third relay 25 that controls the compressor 12 by ○N-○Fl, and controls the compressor 12 by input from the microcomputer 22.

Note that the microcomputer 22 has an F comparator 19.
When the input from the
” signal is output and the input from F comparator 19 is “L”.
ow” signal, the third transistor 26 is set to “Low”
It is configured to output a signal, and when the input from the R comparator 13 is a "High" signal, it outputs a "High" signal to the first transistor 1θ,
If the input from the R comparator 13 is a "Low" signal, a "Low" signal is output to the first transistor 16, but the R
When the "Low" signal from the comparator 13 is input, the time that the "Low" signal is input is counted, and if that time exceeds a certain period of time (for example, 60 minutes), a certain period of time (for example, 3 minutes) is forced. To' Hi q
h'' signal to the first transistor 16 and the second transistor 24.

The operation of the refrigerator internal temperature control device configured as described above will be explained below.

First, regarding the internal temperature adjustment of the freezer compartment 6, the internal temperature of the freezer compartment 5 detected by the F thermistor 18 (the higher the internal temperature, the lower the resistance value of the F thermistor) is determined by the required cooling temperature (fixed resistor 20a.

2ob, 20G, determined by the value of the variable resistor 21), the output of the F comparator 19 becomes “Hi”.
gh” signal.

When a "High" signal is input to the microcomputer 22, a "High" 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 on, and the second relay 23 and the third relay 25 are turned on.
The internal contacts of the blower 4 and the compressor 12 are shorted, respectively.
By being energized, cold air is sent into the freezer compartment 6 to cool the interior of the freezer compartment 5. The internal temperature of the freezer compartment 5 is an unnecessary cooling temperature (fixed resistor 2 = Oa, 20b, 20c,
(determined by the value of the variable resistor 21), the output of the F comparator 19 becomes a "Low" signal. “Low” from F comparator 19 to microcomputer 22
When a signal is input from the microcomputer 22 to the second transistor 24 and the third transistor 26, the "L" signal is input.
ow" signal is output. As a result, the second transistor 24 and the third transistor 26 are turned off, and the internal contacts of the second relay 23 and third relay 25 are opened, respectively, and power to the blower 4 and compressor 12 is stopped. By doing so, the internal cooling of the freezer compartment 5 is stopped.

Through the above operations, the internal temperature of the freezer compartment 5 is adjusted.

On the other hand, the temperature inside the refrigerator compartment 6 is controlled as follows.

In other words, as in the conventional example, the R comparator 13 outputs a "High" signal when the internal temperature of the refrigerator compartment 6 detected by the R thermistor 1o is higher than the required cooling temperature, and outputs a "Low" signal when it is lower than the unnecessary cooling temperature. Output.

Microcomputer 22 iJR Near 7) The electric damper device 8 is controlled by outputting to the first transistor 16 according to the input from the nilator 13 and controlling the first relay 17.

For example, in FIG. 4, state A is the relationship between the operation of the electric damper device 8 and the internal temperature at a normal outside temperature, for example, 20°C. Since the signal output time is 50 minutes or less, the "Low" output time from the microcomputer 22 to the first transistor 16, that is, the de-energization time to the solenoid of the electric damper device 8 (
Since the buckle 8a closed state time) is also less than 60 minutes, the electric damper device 8 operates in the same manner as the conventional example.

Next, state B occurs when the cooling time is long and does not require a refrigerator, such as when the outside temperature is low (for example, 0°C), that is, when the R comparator 13
The "Low" signal output time from
This is the case when the closed state time of q is, for example, 50 minutes or more.

In such a case, in the conventional example, the puzzle 8q remains in the closed state until the internal temperature of the refrigerator compartment 6 reaches the required cooling temperature.Of course, in the internal temperature device of the present invention, the low" from the comparator 22 When the output time reaches 60 minutes, the microcomputer 22 outputs the first transistor 1.
6 and the second transistor 24 for 3 minutes"' High
h” signal is output.

During this period, the switching operations of the first transistor 16 and the second transistor 24 cause the first relay 17 and the second
When the contacts inside the relay 23 are connected and the solenoid 8b and the blower 4 are energized, the baffle 8q is opened and the blower 4 is operated. Note that the time period during which the baffle 8q is forcibly opened is such a short time that the influence on the internal temperature of the refrigerator is small.

As described above, according to this embodiment, the microcomputer 2
2, the blockage time of the baffle 8q is counted, and when the baffle 8q is blocked for a certain period of time or more, the baffle 8q is opened for a certain period of time by a signal from the microcomputer 22, and the blower 4 is operated periodically. By letting cold air flow in from the duct end to remove stagnation of humid warm air from inside the refrigerator room e around the electric damper device 8, frost formation on the baffle 8q and the contact area between the baffle 8q and the rib 9 is eliminated and freezing is prevented. It can be prevented.

In this embodiment, an example is shown in which an electromagnetic solenoid is used as the electric damper device, but a motor, a stevening motor, etc. may also be used.

Effects of the Invention As described above, the present invention forcibly opens the baffle for a certain period of time when the baffle of an electric damper device is closed for a certain period of time, and at the same time forces the blower to operate to periodically supply cold air. By flowing into the refrigerator, it is possible to prevent the electric damper device from becoming inoperable due to baffle freezing.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of a refrigerator showing an embodiment of the present invention;
Fig. 2 is an enlarged cross-sectional view of the main parts of the electric damper device, Fig. 3 is a schematic cross-sectional view of a refrigerator equipped with the structure of the main parts shown in Fig. 2, and Fig. 4 is an explanatory diagram of the operation of the electric damper device shown in Fig. 2. , FIG. 5 is a schematic sectional view of a conventional refrigerator, FIG. 6 is an enlarged sectional view of the main part of the electric damper device installed in the refrigerator shown in FIG.
FIG. 3 is a control circuit diagram of the refrigerator shown in FIG. 4...Blower, 8...Electric damper device, 8q...Baffle. Name of agent: Patent attorney Toshio Nakao and 1 other person8-
-One electric damper Hagi I

Claims (1)

[Claims] The temperature inside the refrigerator is detected, and when the temperature inside the refrigerator exceeds a certain temperature, the baffle is opened to allow cold air to flow into the refrigerator, and when the temperature inside the refrigerator falls below a certain temperature, the baffle is closed, stopping the flow of cold air into the refrigerator. An internal temperature control device for a refrigerator or the like, comprising an electric damper device that forcibly opens the baffle for a certain period of time and operates a blower when the baffle is closed for a certain period of time or more.