JPH06100413B2 - Refrigerator air cooler - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cold air control device for a refrigerator having a damper device for controlling the amount of cold air supplied to a storage compartment.

[0002]

2. Description of the Related Art Conventionally, for example, in a refrigerator, cold air is directly supplied to the storage chamber, or cold air is supplied to a cold air passage for indirectly cooling the storage chamber to cool the storage chamber. In this way, the temperature control in the case of cooling the storage chamber by forcibly circulating the cold air is performed by a damper thermostat as a cold air flow control device as disclosed in Japanese Utility Model Laid-Open No. 54078/1985. It was done by opening and closing the cold air discharge port of.

The damper thermostat as disclosed in the above publication detects the temperature in the storage chamber by means of a capillary tube, which is a heat-sensitive tube containing gas, and compresses the bellows by utilizing the compression / expansion of gas accompanying the temperature change in the chamber.・
The expansion is performed, the damper is driven thereby, and the baffle plate opens and closes the cold air outlet to control the amount of cold air supplied to the room to control the temperature of the storage room, but the gas through the capillary tube is used. Since the phase change of is used, the response to temperature change is slow,
Further, since the accuracy is low, it is difficult to change the temperature setting and the control temperature is not stable.

In order to eliminate such a drawback, it is considered that the opening and closing of the baffle plate is electrically controlled to improve the response speed and reliability. As a means in this case, first, it is conceivable to drive the baffle plate by utilizing the attracting and releasing operations of the plunger by the solenoid coil. next,
It is conceivable to rotate the cam with a motor and drive the baffle plate with this cam.

[0005]

In the case of driving the baffle plate by using the attraction and detachment operations of the plunger by the solenoid coil, only two states of opening or closing the discharge port by the baffle plate are selected. However, there was a problem that the sound of impact caused by the operation of adsorbing and releasing the plunger became unpleasant.

On the other hand, in the case where the baffle plate is driven by the motor and the cam, the above-mentioned impact noise can be eliminated by adopting the speed reducing mechanism, but the device itself becomes larger as the deceleration of the speed reducing mechanism is increased. In addition to this, there is another problem that the operation speed of the baffle becomes slow.

Therefore, according to the present invention, the operating time of the motor is appropriately selected based on the set temperature of the storage chamber so that the baffle plate can be stopped at a position between fully open and fully closed. It is an object of the present invention to provide a cold air control device for a refrigerator that can control the amount of cold air supplied in two or more stages.

[0008]

According to the present invention, there is provided a duct which communicates with a cool air passage provided with a cooler and introduces cool air into a storage chamber, and a duct which is provided at an inlet side or an outlet side of the duct to the storage chamber. A refrigerator provided with a baffle plate for controlling a supply amount of cold air, a drive member for driving the baffle plate to open and close, a cam having a cam surface for operating the drive member, and a motor for rotating the cam, Setting means for setting the temperature of the storage chamber and the open position of the baffle plate for maintaining this temperature, temperature detecting means for detecting the temperature of the storage chamber, set temperature and the temperature set by the setting means The control device controls the operation of the motor based on the temperature detected by the detection means, and the control device controls the operation of the motor at the open position of the baffle plate set by the setting means. Refrigerator cold control apparatus characterized by selecting the operating time of the motor so as to stop the full plate.

[0009]

The controller operates so as to select the operating time of the motor in order to stop the baffle plate at the open position determined so as to reach the set temperature set by the setting means.
The conventional cool air control device using a motor (especially a control device for controlling the operation of the motor) does not increase in size only by making some improvements, and it is based on the set temperature and the detected temperature of the storage room. It is possible to control the amount of cold air supplied (in particular, to control the amount of cold air in two or more stages in which the baffle plate is stopped at a position between fully closed and fully opened), and it is possible to control the temperature according to the set temperature.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a refrigerator will be described with reference to the drawings. FIG. 4 shows a side sectional view of the refrigerator 1. In the refrigerator 1, a synthetic resin inner box 3 is installed in a steel plate outer box 2 with a space, and a urethane heat insulating material 4 is foam-filled between both boxes 2 and 3 to form a heat insulating box. . The inside of the refrigerator 1 is divided into upper and lower parts by a heat insulating partition wall 5, and a freezer compartment F that is cooled to a freezing temperature (for example, -20 ° C) is provided above, and a storage where the temperature can be selected as described below is provided below. It forms a chamber S. Reference numeral 6 denotes a back plate of the freezing compartment F, which has a heat insulating material 7 on its back surface and forms a cold air passage 8 between the back surface of the freezing compartment F portion of the inner box 3 and the heat insulating material 7 and the back plate 6. The back plate 6 is attached to the inner box 3. A cooler 9 such as a plate fin type evaporator, which constitutes a part of the refrigeration cycle, is vertically installed in the cold air passage 8, and an air blower blower 10 is installed above the cooler 9.
Is attached to the insulation box.

FIG. 5 shows a plan sectional view of the blower 10 portion. A discharge port 12 communicating with an upper portion of the cooler 9 of the cool air passage 8 is slightly below the portion of the rear plate 6 located immediately before the blower 10, and a lower portion of the cooler 9 of the cool air passage 8 is at the lower end of the rear plate 6. A suction port 13 that communicates with the blower 10 is bored, and the cool air discharged from the blower 10 once collides with the back plate 6 and a part of the cool air is discharged from the discharge port 12 into the freezer compartment F.
After being circulated and cooled in the freezer compartment F, it is sucked into the cooler 9 through the suction port 13.

An opening 14 is formed in the back wall of the inner box 3 located on the side of the blower 10, and a discharge port 15 in the upper back wall of the storage chamber S and a cooler are formed on the back surface of the inner box 3 corresponding to the opening 14 portion. 9
A duct member 17 that forms a duct 16 that communicates with the upper cool air passage 8 through an opening 14 is attached.
A return passage 19 is formed in the partition wall 5 to connect the upper portion of the storage chamber S and the lower portion of the cool air passage 8 to the cooler 9. A damper device 20 as a cool air control device of the present invention is arranged so as to be embedded in the heat insulating material 4 at the corner of the back wall of the inner box 3 on the side opposite to the blower 10 of the opening 14. A baffle plate 21 as a cold air control plate included in the damper device 20 is located in front of the opening 14 and opens and closes it. The baffle plate 21 is rotatably supported at the corners of the inner box 3 and pivots counterclockwise in FIG. 5 to open the opening 14 when the moving rod 73 of the damper device 20 moves forward. At the same time, the duct 1 guides the cool air discharged from the blower 10 and colliding with the back plate 6 and flowing to the side.
Lead into 6 At this time, the baffle plate 21 is formed with an auxiliary plate 21A that rises vertically from the back surface of the substrate in the direction of the opening 14, and thereby cool air is satisfactorily guided to the opening 14 and the duct member 17. On the other hand, when the moving rod 73 moves backward, the baffle plate 21 rotates clockwise in FIG. 5 to close the opening 14. The cool air that has flowed into the duct member 17 descends there, flows from the discharge port 15 into the storage chamber S, circulates and cools the storage chamber S, and then returns from the return passage 19 to the cooler 9
Is sucked into.

For example, in the case of opening and closing the discharge port 15, when the discharge port 15 is closed, the baffle plate 21 is frozen due to a temperature difference between the duct 16 and the storage chamber S, and unnecessary cold air is introduced into the duct 16. In the present invention, since the control of the supply amount of the cool air to the storage chamber S is performed at the opening 14 which is the inlet of the duct 16 as described above, such inconvenience is eliminated and the opening 14 When closed, the cool air that should flow from the blower 10 to the duct 16 is discharged forward from the discharge port 12A formed in the corner of the back plate 6 and is effectively used for cooling the freezer compartment F. There is no waste of cold air. 24 and 25 are a freezing room F and a storage room S
, And 26 are electric compressors included in the refrigeration cycle.

FIG. 8 shows an electric circuit diagram for controlling the temperature of the freezer compartment F. Reference numeral 40 denotes a negative characteristic thermistor as a temperature detecting means for detecting the temperature of the freezer compartment F, which is connected between the DC power supply V _CC and the grounded resistor 41, and the terminal potential of the resistor 41 is at the-input terminal of the comparator 42. Is input and the comparator 42 +
The set potential determined by the resistors 43 and 44 is input to the input terminal. The comparator 42 has a hysteresis due to the positive feedback resistor 45, and its output is connected to the gate of the triac 48 for triggering the gate of the triac 47 which controls the motors 26M and 10M described later via the resistor 46. A parallel circuit of a motor 26M for driving the electric compressor 26 and a motor 10M of the blower 10 is connected to the triac 47 in series with an AC power source. The comparator 42 is a freezer F
When the temperature rises above -18 ° C, the output becomes a low potential (hereinafter referred to as "L"), so that the triacs 48 and 47 are triggered to drive the motors 26M and 10M, and below -22 ° C, for example. The output becomes high potential (hereinafter referred to as "H"), the triacs 48 and 47 become non-conductive, and the motors 26M and 10M are stopped. The freezing compartment F is cooled to an average of -20 ° C by repeating the above operation.

FIG. 1 is an enlarged cross-sectional view of the damper device 20, and FIG. 2 is a partially cutaway front view of the damper device 20. Reference numeral 60 denotes a case that is embedded in the heat insulating material 4 from the opening 30 formed in the inner box 3 on the side of the opening 14. Inside the case 60, an AC motor 61 having a drive shaft 61a protruding forward and the drive shaft 61a A small-diameter bevel gear 62 attached to the tip of the casing 61a and a large-diameter bevel gear 64 which is fixed to a rotating shaft 63 extending downward from the inside of the case 60 and meshes with the bevel gear 62 are housed. This bevel gear 6
2, 64 constitute a speed reduction mechanism 65, and the rotation of the motor 61 is converted into the rotation of the rotary shaft 63. A cam 66 is further fixed to the rotating shaft 63.

The cam 66 is a disk-shaped plate having a predetermined thickness,
The plan view is shown in FIG. L ₁ , L ₂ , L ₃ and L ₄ are 0 °, 90 °, 180 ° and 270 about the rotation axis 63.
It is a line showing each °. Area of 30 ° centered on the L ₁ P ₁ is the center of a circle of radius 4r about axis 63 L ₁
The above is displaced by r, and the displaced arc in the opposite direction,
That is, the side surface of the arc is close to the shaft 63. Therefore, the distance from the center of the area P ₁ to the axis 63 is 3r.
In addition, an area P _{2 of} 30 ° centered on L ₂ and L ₄ respectively
And P ₄ are side surfaces of an arc centered on the shaft 63 and having a radius of 4r. Further, a 30 ° area P ₃ centered on L ₃ has a side surface shape of an arc centered on the axis 63 and having a radius of 5r. Furthermore, the respective areas are connected to each other by a smooth curve at a distance of at least 3r from the axis 63.

The baffle plate 21 is rotatably fixed to the end portion of the front wall 67 of the case 60 on the non-opening 14 side by a shaft 68, and the portion near the shaft 68 of the baffle plate 21 is formed by the front wall 67 and the spring 72. It is connected and is always biased in a direction to close the opening 14. The movable rod 73 is provided through the front wall 67 so as to be movable in the front-rear direction, and slidably contacts the cam 66 and the baffle plate 21. In addition, as for 74, the baffle plate 21 has the opening 1
It is a switch that closes the contact 74A when the switch 4 is closed.
The switch 74 may detect the closing of the baffle plate 21 as a contact relationship with the cam 66.

FIG. 7 shows an electric circuit diagram for controlling the temperature of the storage compartment S. Reference numeral 75 is a negative characteristic thermistor as a temperature detecting means for detecting the temperature in the storage chamber S, and the terminal potential of the thermistor 75 divided by the resistor 76 is input to the-input terminal of the comparator 77. A resistor 78 is connected to the + input terminal of the comparator 77.
The set potential determined by and 79 is input. A series circuit of a switch SW ₁ and a resistor 80 having a relatively large value is connected in parallel to the resistor 78 connected to the power source V _CC.
8 is connected in parallel with a series circuit of an analog switch 81 and a resistor 82 having a relatively small value. The comparator 77 is connected to the positive feedback resistor 83 and has hysteresis, and its output is input to the AND gates 84 and 85. Power V _CC and is between the ground directly circuit of the series circuit and the switch SW ₃ of the switch SW ₂ and the resistor 86 resistor 86 is connected in parallel, the terminal potential of the resistor 86 to the gate of the AND gate 84 and the analog switch 81, The terminal potential of the resistor 87 is input to the AND gate 85. Switches SW ₂ and SW ₃
Is configured such that when one is closed, the other is opened, and when the switch SW ₂ is further closed, the switch SW ₁ is opened. These switches SW ₁ , SW ₂ , SW ₃ are setting means for setting the temperature of the storage room S, and are arranged on the operation panel 89 provided on the front surface of the door 25.

The output of the AND gate 84 is converted into a pulse by the differentiating circuit I ₁ and input to the input terminal of the timer T ₁ . The timer T ₁ sets the output potential of the output terminal to “H” for t ₁ time from the time when the “H” pulse is input to the input terminal, and its output is input to the OR gate 90. AND
Similarly, the output of the gate 85 also passes through the differentiating circuit I ₂ and the timer T ₂
Is input to the input terminal of the timer T ₂
The output potential of the output terminal is set to "H" for t ₂ time after the pulse is input, and the output is input to the OR gate 90.
The output of the OR gate 90 is input to the set terminal of the flip-flop 91 via the differentiating circuit I ₃ , and further the inverter 9
It is input to the reset terminal of the flip-flop 91 via 2 and the differentiation circuit I ₄ . The output of OR gate 90 is input further to the reset terminal of the inverter 93 and the differential circuit timer T ₁ through I _5, T _2, each timer T _1, T ₂ is "H" pulse is then input Reset to the reset terminal It The output of the comparator 77 is further input to the set terminal of the flip-flop 91 via the inverter 94 and the differentiating circuit I ₆ , and the reset terminal is further connected to the contact 74A of the switch 74 and the power supply V.
The terminal potential of the resistor 95 connected in series with _CC is differentiating circuit I ₇
Be entered via. The inverting output terminal of the flip-flop 91 is connected to the gate of the triac 97 which is connected in series with the motor 61 and the AC power supply AC.

The temperature control operation of the storage chamber S having the above configuration will be described with reference to FIG. When the storage room S is first used as a freezing room, the switch SW ₂ is closed. At this time, the switches SW ₁ and SW ₃ are open. As a result, the analog switch 81 becomes conductive and the resistor 78 has a smaller value.
Since the two are connected in parallel, the + input potential of the comparator 77 rises relatively large, and at this time, the output of the comparator 77 is the storage chamber S
When the temperature is −18 ° C., it becomes “H”, and at −22 ° C., it becomes “L”. When the storage chamber S is sufficiently cooled, the cam 66 is located at 66a indicated by the alternate long and short dash line in FIG. 1, is in contact with the moving rod 73 at the shortest distance 3r from the rotating shaft 63, and the baffle plate 21 is located at the position 21a. It closes the opening 14. When the temperature of the storage chamber S rises from this state and reaches −18 ° C. at the zero time in FIG. 9, the output of the comparator 77 becomes “H” and the terminal potential of the resistor 86 is also “H”. the output of the 84 becomes "H", "H" pulse is inputted to the timer T _1, the output of the timer T ₁ is set to "H". As a result, the output of the OR gate 90 becomes "H", the "H" pulse is input to the set terminal of the flip-flip 91, the flip-flop 91 is set, the inverted output terminal becomes "L", the triac 97 is conducted, and the motor 61 is turned on. Rotate. This cam 66 is rotated in the counterclockwise direction in FIG. 1, the timer T ₁ at time t ₁ has elapsed t ₁ hour from the start of rotation
When the output of the OR gate becomes "L", the output of the OR gate 90 becomes "L" and the output of the inverter 92 becomes "H". Therefore, the "H" pulse is input to the reset terminal of the flip-flop 91 to be reset and inverted. The output terminal becomes "H", the triac 97 becomes non-conductive, and the motor 61 stops. At this time, the rotation angle of the cam 66 is 180 °,
The cam 66 is in contact with the moving rod 73 at a position 5r, which is the longest distance from the rotating shaft 63. As a result, the moving rod 73 is pushed to the frontmost position, the baffle plate 21 is fully separated from the opening 14 and is fully opened, and is stopped at a position where it comes into contact with the back plate 6 as shown by a solid line in FIG. In this state, a large amount of cold air is introduced into the duct 16 and the storage chamber S is rapidly cooled.
After that, when the temperature of the storage room S decreases to −22 ° C., the output of the comparator 77 is inverted to “L”, the output of the inverter 94 becomes “H”, and the “H” pulse is output to the set terminal of the flip-flop 91. It is input and set, the inverting output terminal becomes “L”, the triac 97 becomes conductive, and the motor 61 is operated. This causes the cam 66 to rotate further in the counterclockwise direction, thereby closing the baffle plate 21, and when the opening 14 is completely closed, the contact 74A is closed and a voltage is generated in the resistor 95 to reset the flip-flop 91. Therefore, the motor 61 is stopped. This is repeated thereafter, and a large amount of cold air is introduced into the duct 16, and the inside of the storage chamber S is kept at an extremely low temperature such as -20 ° C between -18 ° C and -22 ° C, so that frozen food can be stored.

Next, when the storage room S is used as an ice greenhouse, the switch SW ₃ is closed and the switch SW ₁ is closed. At this time, the switch SW ₂ is opened. At this time, a resistor 80 is connected in parallel to the resistor 78, and the + input potential of the comparator 77 rises slightly. As a result, the comparator 77 sets the output to “H” when the temperature of the storage room S is 0 ° C., and sets the output to “L” when the temperature is −3 ° C. When the storage chamber S is sufficiently cooled and the baffle plate 21 closes the opening 14 at the position 21a and the temperature rises to 0 ° C. at time zero in FIG.
The output of 7 becomes "H". Output becomes "H" of the turn AND gate 85 from the high potential at this time to the terminals of the resistor 87 is generated, H pulse is inputted outputs to the timer T ₂ is OR gate 90 becomes "H" The output becomes "H", the flip-flop 91 is set, and the motor 61 starts moving in the same manner as described above. As a result, the cam 66 rotates counterclockwise in FIG. 1, and when the output of the timer T ₂ becomes “L” at time t ₂ when t ₂ time has elapsed from the start of rotation,
The output of the OR gate 90 becomes "L", and the inverter 92
Becomes "H", the flip-flop 91 is reset and the motor 61 stops as described above. Cam 6 at this time
The rotation angle of 6 is 270 °, and at this time, the cam 66 is shown in FIG.
As shown in FIG. 3, the portion of the longest distance 5r from the rotary shaft 63 is located directly below, and is located at 66b shown by the alternate long and short dash line in FIG.
It is in contact with 3. As a result, the baffle plate 21 is stopped in a middle-open state indicated by 21b in FIG. 1, which is approximately halfway between the fully-open position and the closed position. In this state, cool air is introduced into the duct 16 to cool the storage chamber S, and when the temperature drops to -3 ° C, the output of the comparator 77 is inverted to "L", so that the output of the inverter 94 is "H". And flip-flop 91
Is set and the motor 61 rotates. As a result, the cam 66 further rotates counterclockwise, and the baffle plate 21
Stops as described above with the opening 14 closed.

This is repeated thereafter, and the temperature in the storage chamber S becomes 0 ° C.
The average is −2 ° C. between 3 ° C. Where 0 ° C to -3 ° C
Is the ice storage temperature zone. Ice temperature storage temperature refers to the temperature that is based on the property that the freezing point of food is lower than the freezing point, but is below freezing but just before freezing of the food.By storing the food in this temperature range, the food is frozen. Without suppressing the reproduction of bacteria, the bacteria can be stored for a relatively long period of time, and the deterioration of flavor due to freezing can be prevented. Although the range of the ice storage temperature zone is relatively narrow, the baffle plate 21 is stopped at the middle open position as described above, and the inflow of cold air from the opening 14 is restricted and reduced, so that the damper device 20 is frequently used. Baffle plate 21
As a result, the amount of cold air that flows in during the movement of is reduced and the temperature is controlled well within the temperature range. Further, at this time, as shown in FIG. 9, the opening operation of the baffle plate 21 is changed from closed to middle open, and then once fully opened and then closed again to middle open, so that a relatively large amount of cold air is introduced at the start of cooling. As a result, the cooling speed is improved, and the baffle plate 21 is rotated by 90 ° as it is from the middle open position to close.
The supercooling due to the cold air flowing during the movement of is extremely reduced.

Next, when the storage room S is used as a refrigerating room, the switch SW ₃ is closed and the switch SW ₁ is opened. (At this time, the switch SW ₂ is opened.) At this time, since the set potential connected to the + input terminal of the comparator 77 is a relatively low value divided by the resistors 78 and 79, the comparator 77 is operated in the storage chamber S. When the temperature is, for example, + 5 ° C., the output is “H”, and when the temperature is + 1 ° C., the output is “L”. The damper device 20 is driven by the motor 61, and the baffle plate 21 is controlled to be closed and open in the same manner as in the case of being used as the above-mentioned ice greenhouse, and the average temperature is + 3 ° C. The function and effect are substantially the same as described above.

As described above, the storage room S can be selectively used as a freezing room, an ice greenhouse, or a refrigerating room, so that it effectively responds to changes in the composition ratio of frozen foods, ice-temperature stored foods or refrigerated foods among the foods to be stored. Therefore, the dead space of the refrigerator volume is reduced, and the effective use of the room is achieved. Further, in this case, the amount of cold air introduced when the damper device 20 is opened can be changed by the operating time of the motor 61. For example, even if the opening area of the opening 14 is increased in consideration of the temperature control characteristics when used as a freezing room, In the case of controlling in the temperature zones of 1, the baffle plate 21 is opened in the middle to limit the introduction amount, so that the control performance in each temperature zone is not impaired. Further, since the damper device 20 is driven by the motor 61 having the speed reduction mechanism 65, the responsiveness to the temperature change is excellent, and stable temperature control is possible, and the baffle plate 21 collides with the peripheral edge of the opening 14 when closing. Since it does not, it produces less noise than electromagnetic dampers.

Further, as described above, the distance from the shaft 63 to the side surface does not change in the area P ₂ , P ₄ or P _{3 of the} cam 66. That is, the target rotation angle of the cam 66, for example 180
Areas of 15 degrees in the front and rear, centered at (full opening of the baffle plate 21) or 270 degrees (opening of the baffle plate 21), are areas where the opening of the baffle plate 21 is not changed, that is, unchanged areas. Therefore, even if there is some error in the rotation angle due to the inertia of the motor 61 or the meshing error between the gears 62 and 64, the baffle plate 21 remains in the unchanged area.
There is no error in the opening degree of, and stable temperature control is possible. Also, because of this, the deceleration of the reduction mechanism 65 can be reduced,
The operating speed of the baffle plate 21 can be increased.

Although the present invention is applied to the damper device for controlling the temperature of the storage room of the refrigerator in the embodiment, the present invention is not limited to this, and may be applied to a cold air distribution device or the like for controlling the flow direction of cold air. Various applications are possible without departing from the gist of the present invention.

[0027]

According to the present invention, the control device acts to select the operating time of the motor in order to stop the baffle plate at the open position which is set so as to reach the set temperature set by the setting means. The conventional cool air control device using a motor (particularly the control device that controls the operation of the motor) does not need to be increased in size, and the set temperature of the storage chamber and the detected temperature do not have to be increased. It is possible to control the amount of cold air supplied based on the above, particularly to control the amount of cold air in two or more steps in which the baffle plate is stopped at a position between fully closed and fully open, and to perform temperature control in accordance with the set temperature.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a damper device.

FIG. 2 is a front view of the damper device in a partially cutaway state.

FIG. 3 is a plan view of a cam of the damper device.

FIG. 4 is a side sectional view of the refrigerator.

FIG. 5 is a cross-sectional view of a blower portion of the refrigerator.

FIG. 6 is a vertical sectional view of a duct portion of a refrigerator.

FIG. 7 is an electric circuit diagram for controlling the temperature of the storage compartment.

FIG. 8 is an electric circuit diagram for controlling the temperature of a freezing room.

FIG. 9 is an explanatory diagram showing operating states of a cam and a baffle plate.

Claims (1)

[Claims] 1. A duct which communicates with a cool air passage provided with a cooler and introduces cool air into a storage chamber, and a baffle plate which is provided at an inlet side or an outlet side of the duct and controls a supply amount of the cool air to the storage chamber. In a refrigerator equipped with a drive member for opening and closing the baffle plate, a cam having a cam surface for operating the drive member, and a motor for rotating the cam, the temperature of the storage chamber and the baffle plate Setting means for setting the open position of the motor, temperature detecting means for detecting the temperature of the storage chamber, the set temperature set by the setting means and the detected temperature detected by the temperature detecting means of the motor The control device controls the operation, and the control device selects the operating time of the motor so as to stop the baffle plate at the open position of the baffle plate set by the setting means. A cool air control device for a refrigerator, which is characterized in that: