JPH0623636B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a refrigerator in which compartments are formed in a refrigerator in which cold air is forcedly circulated in the refrigerator by a blower.

(B) Conventional Technology A conventional refrigerator of this type is disclosed, for example, in Japanese Utility Model Laid-Open No. 58-22678. In this publication, a closed storage chamber is formed in a refrigerating chamber, a cold air passage is formed around this storage chamber, and cold air from a blower is introduced into this cold air passage to cool the room without drying it. The temperature control in the room is achieved by adjusting the amount of cold air supplied to the cold air passage by the damper plate, but accurate temperature control by such a manual damper is difficult.

Further, conventionally, this kind of compartment is controlled at a freezing temperature such as a freezing room or at a temperature of + 1 ° C. to + 2 ° C., which is slightly lower than the refrigerating room temperature, and usually stores and stores fast-rotating food such as meat and fish. Although it is used for freezing, although long-term storage of food is achieved with freezing, there is a drawback that the flavor is impaired when thawing for cooking, and the flavor is impaired by controlling + 1 ° C to + 2 ° C. Although it does not exist, it has a short shelf life.

On the other hand, Japanese Utility Model Application Laid-Open No. 58-87083 discloses a damper for controlling cold air to a cold air duct for a freezing room that introduces cool air to the freezing room or a cold air duct for a cold room that introduces cool air to the refrigerating room. Alternatively, a fan-type electric refrigerator in which the damper is controlled to open and close by a pulse motor based on the temperature of the refrigerating room is disclosed, but in general, when the compressor is stopped, the blower is also stopped. Therefore, the blower is not always operated when the damper is opened, the amount of cold air circulating in the cold air duct cannot be maintained properly, and it takes time to cool the temperature of the freezer compartment or the refrigerator compartment to a desired temperature. There was such a problem.

Further, Japanese Patent Laid-Open No. 58-164980 discloses a refrigerator in which the opening angle of the damper and the rotation speed of the fan are variable and the opening angle and the rotation speed are changed according to the cooling mode. Japanese Utility Model Publication No. 50-14208 and Japanese Utility Model Publication No. 50-14208 each disclose a refrigerator in which a blower is operated when the temperature of the refrigerating compartment is equal to or higher than a preset temperature regardless of the temperature of the freezing compartment. Even if the temperature is the same, the opening degree of the damper device is made different between when the detected temperature rises and when it falls, so that the flow rate of cold air is controlled according to the amount of cooling required for the food to be cooled. There was a problem that I could not do.

(C) Object of the invention The present invention forms a compartment in a refrigerator in which cool air is circulated and cooled by a blower to maintain the interior at an ice temperature storage temperature, and improves the temperature controllability. It is to provide a refrigerator.

(D) Configuration of the invention The present invention is a temperature control device for controlling on / off at a predetermined rotation speed of the blower based on the temperature of the freezer compartment detected by the freezer compartment sensor, and a compartment formed in the heat-insulating box in a substantially sealed manner. When,
A cold air passage formed around the compartment to indirectly cool the compartment, and a damper device for controlling the flow of cold air to the cold air passage based on a compartment sensor that detects a temperature in the compartment. In a refrigerator provided, a control means is provided for determining whether the temperature of the compartment is a rising tendency or a falling tendency by respectively setting a constant temperature higher upper limit temperature and a constant temperature lower lower limit temperature with respect to the set temperature of the compartment. The temperature control device, when the judgment result by the control means is in a downward trend, lowers the blower speed lower than the predetermined rotation speed when the temperature is equal to or higher than the set temperature regardless of the temperature detected by the freezer compartment sensor. When the damper device is operated at a rotation speed and the damper device is fully opened, and when the temperature is equal to or higher than the lower limit temperature and is lower than a set temperature, the damper device is in an intermediate open state and is lower than the upper limit temperature. Closes the damper device, closes the damper device when the temperature is lower than the preset temperature, and closes the damper device when the temperature is lower than the preset temperature when the judgment result of the control means tends to rise. The damper device is set to the middle open state, and when the temperature is equal to or higher than the upper limit temperature, the damper device is fully opened.

(E) Example An example will be described with reference to the drawings. FIG. 8 shows a sectional view of the refrigerator (1). The refrigerator (1) incorporates a synthetic resin inner box (3) in a steel plate outer box (2) with a space between both boxes (2).
A urethane heat insulating material (4) is foam-filled between (3) to form a heat insulating box. The inside of the refrigerator (1) is divided into upper and lower parts by a partition wall (5) filled with a heat insulating material, and a freezing room (F) which is cooled to a freezing temperature (for example, -20 ° C) upwards,
A refrigerating chamber (R) which is maintained at a refrigerating temperature above the freezing point (for example, + 3 ° C) is formed below. A part of the refrigerator (1), which is a part of the refrigerator, has a partitioning member that extends across the left and right sides of the opening edge of the refrigerator compartment (R).
(8) is erected, and is supported by the pre-partition member (8) and the recessed groove (3a) formed in the inner box (3) at substantially the same height as the partition member (9) with heat insulation properties. Is attached, and the compartment plate (9) divides the refrigerating compartment (R) into upper and lower compartments. In the space above the partition plate (9), a cold air passage (10) is formed with a space between the lower surface of the partition wall (5), the upper surface of the partition plate (9), both side surfaces of the inner box (3) and the rear surface, and A box-shaped case (1
1) is incorporated. The opening edge of the case (11) is brought into contact with the inner box (3), the partition wall (5) and the partition plate (9), whereby the compartment (communication inside the case (11) communicates only with the outside of the compartment ( H) is formed and the front end of the cold air passage (10) is closed.

Above the partition wall (5), a bottom plate (13) of the freezer compartment (F) having a heat insulating material on the lower surface is provided at a distance and a cooling chamber is provided between the bottom plate (13) and the partition wall (5). (14) is formed. This cooling room (14)
A cooler (15) included in the refrigeration cycle is housed and installed therein, and a blower (16) is provided behind the cooler (15). The motor (16M) that drives the blower (16) is the cooling chamber (14)
It is stored in the storage box (17) located behind the outer box (2) and embedded in the backside of the outer box (2) and embedded in the heat insulating material (4). ) And the inner box (3) to face the inside of the cooling chamber (14), and a blower fan (16F) is attached to the tip thereof. The blower (16) rotates and sucks cool air from the rotation axis direction and blows it out in the radial direction. Freezer
The rear side (13a) of the bottom plate (13) of (F) rises upward with a space from the rear surface of the inner box (3) and connects the rear part of the cooling chamber (14) with the freezing chamber (F) (18). The cold air accelerated by the blower (16) is discharged from the discharge port (18a) at the tip of the duct (18) to the freezer.
It is discharged to (F). (19) is the rear of the cooling chamber (14) and the cold air passage (1
(0) is a duct member that forms a duct (20) communicating with the cold air accelerated by the blower (16) from the discharge port (20a) formed on the upper rear surface of the inner box (3) behind the cool air passageway (10). Cold aisle (10)
Is discharged inside. Reference numeral (21) is a duct that connects the rear part of the cooling room (14) and the refrigerating room (R), and cool air is discharged into the refrigerating room (R) from the discharge port (21a). The cold air that circulates in the freezing compartment (F) and the cold air passageway (10) is cooled by directly cooling the freezing compartment (F), and the compartment (H) is cooled by indirect cooling from the case (11). 14)
Cooling chambers from the cold air intakes (22) and (23) communicating with the front
Return to (14). In the heat insulation material (4) on the side wall of the refrigerator (1), there is formed a return duct (24) connecting the refrigerating compartment (R) and the front part of the cooling compartment (14), and passing through this, the refrigerating compartment (R). The cool air inside returns to the cooling chamber (14) from the suction port (25). (26) is a compressor included in the refrigeration cycle, (27) (28) (29) are chambers (F) (H)
It is a door that can open and close the front opening of (R).

The amount of cold air discharged from the discharge ports (20a) (21a) is controlled by the damper device (35).
Adjusted by (36). Damper device here (35) (36)
May be provided at the suction ports (23) and (25), respectively. The damper device (35) is a step motor (38) housed in the case (37).
And a baffle plate (40) which is attached to the tip of an arm (39) fixed to the step motor (38) via a worm gear or the like and which opens and closes the discharge port (20a). Step motor
(38) is a structure in which the arm (39) is rotated normally or reversely in steps of 15 ° by a control circuit which will be described later, and the discharge port (20a) is closed (40a) in FIG. Then, it is rotated forward one step to open about 15 °, and the middle open state (40b) is opened one step further to open about 30 ° (40c). It is a thing. As a result, the discharge port (20a) is controlled in three stages: a completely blocked state, a state in which a small amount of cold air flows out, and a state in which a large amount of cold air flows out. The damper device (36) includes a Punlanger, an electromagnetic coil (36A), and a damper device (3
It is composed of the same arm and baffle plate as in 5).

FIG. 2 shows an electric circuit diagram of the temperature controller (TC). (41) and (42) are triacs and compressor motors (2
6M) and the electromagnetic coil (36A) of the damper device (36) constitute a series circuit and are connected to an AC power source (AC). Reference numeral (43) is a control circuit for rotating the step motor (38) forward or reverse step by step as described above, and (44) is a transistor connected to the blower motor (16M). (45) is a well-known microcomputer, and its output terminal (OUT ₁ ) (OU
T ₂ ) (OUT ₃ ) (OUT ₄ ) are respectively triacs (41)
It is connected to the gate of (42), the control circuit (43) and the base of the transistor (44). Reference numerals (46), (47) and (48) are comparators composed of operational amplifiers, each of which has an output terminal whose input terminal (IN ₁ ) (IN ₂ ) (I) is input to the microcomputer (45).
N ₃ ). (49) (50) (51) are thermistors (negative resistance elements) as sensors that detect the temperature in the compartment (H), the freezer compartment (F), and the refrigerator compartment (R), respectively. ) (50) (51) terminal potentials (V ₁ ) (V ₂ ) (V ₃ ) are connected to the inverting input terminals (-) of the comparators (46) (47) (48), respectively. The set potentials (V ₅ ) (V ₆ ) are input to the non-inverting input terminals (+) of the comparators (47) and (48). (r ₁ )
(r ₂ ) (r ₃ ) are resistors, which are connected in series. The resistor (r ₃ ) has a switch means (SW ₁ ), and the resistor (r ₂ ) (r ₃ ) has a switch means (SW). ₂ ) are connected in parallel, and the terminal potential (V ₄ ) is connected to the non-inverting input terminal (+) of the comparator (46). The switch means (SW ₁ ) (SW ₂ ) are connected to the output terminals (OUT ₅ ) (OUT ₆ ) of the microcomputer (45). The triacs (41) (42) are triggered by the gate by the microcomputer (45) and become conductive so that the motor (26
Energize M) and the electromagnetic coil (36A). The electromagnetic coil (36A) is energized to operate the electromagnetic damper (36) to open the discharge port (21a) and close the discharge port (21a) in the non-energized state. The transistor (44) is the output terminal of the microcomputer (45)
(OUT ₄ ) conducts during a low potential (hereinafter referred to as "l") to drive the motor (16M), but the output terminal
The rotation speed of the motor (16M) is also changed by changing the output pulse width generated at (OUT ₄ ). comparator
(47) and (48) have a certain hysteresis, and the comparator (47) raises the temperature (TF _N ) of the freezer compartment (F) to (V ₅ )> (V
₂ ) and the output is "h", and it descends to (V ₅ ) <(V ₂ ) and becomes "l". Similarly, the comparator (48) is a refrigerator
The temperature (TR _N ) of (R) rises to (V ₆ )> (V ₃ ) and the output drops as “h” and becomes “l” when (V ₆ ) <(V ₃ ). Is.

The microcomputer (45) has an output terminal (OUT ₅ ) (OUT
_The output generated in ( ₆ ) is constantly switched, and (OUT
₆ ) is "h" and (SW ₂ ) is closed, (OUT ₅ ) is "h" and (OUT ₆ ) is "l" and (SW ₁ ) is closed and (SW ₂ ) is open , (OUT ₅ ) and (OUT ₆ ) are both "l"
(SW ₁ ) and (SW ₂ ) are repeatedly opened and changed. Terminal potential of the resistor this by _{(V 4) (r 1)} , terminal potential of the resistor (r ₁₎ and (r _2), the resistance _{(r 1) (r 2)} (r
The terminal potential of ₃ is repeatedly increased and decreased, and the temperature of the compartment (H) is distinguished and detected in four regions as shown in FIG. 9 according to the output state of the comparator (46) at this time. That is, as shown in FIG. 3 showing the state of each potential (V ₄ ), the output of the comparator (46) and the temperature (TH) of the compartment (H) at that time, the temperature (TH)
For example, when the temperature is above 0 ℃ (TH ₀ ), (V ₄ )> (V ₁ ) in all states and the output of comparator (46) is “h”.
Is. When the temperature (TH) is between (TH ₀ ) and a temperature (TH ₁ ) such as -1 ° C, it becomes "1" at the terminal potential of the resistor (r ₁ ) and the temperature (TH) becomes (TH ₁ ) and the temperature (TH ₂ ) such as -2 ° C, the output of the comparator (46) becomes "l" even when the resistors (r ₁ ) and (r ₂ ) are present, and the temperature (TH When () is lower than (TH ₂ ), the resistance (r ₁ ) (r ₂ ) (r ₃ ) also becomes “l”. In this way, the change in the output of the comparator (46) depending on the state of each (V ₄ ) always determines which temperature range (TH) is. The control circuit (43) is connected to the output terminal (OU) of the microcomputer (45) as described above.
T ₃₎ by driving the step motor (38) based on the output from the control damper device (35), the closed state of the discharge opening (20a) (40a), the intermediately open state (40b), the fully open state ( 40c) and select control.

FIG. 4 shows a functional block diagram of the temperature controller (TC). (55) (56) (57) are thermistors (50) (49) (51) respectively
(58) is a comparator (46), a resistance (r ₁ ) (r ₂ ) (r ₃ ), a switch means (SW ₁ ) (SW ₂ ) and the control circuit (43). (59) is OR
The gates (60) (61) (62) each include a triac (41), a transistor (44), a triac (42), etc., and switching means for driving a motor (26M) (16M) and an electromagnetic coil (36A), respectively. Is. The comparator (47) compares a predetermined set value with the information from the freezer compartment temperature detecting means (55) and operates the switching means (60) (61) to energize the motors (26M) (16M). The comparator (48) also compares a predetermined set value with information from the refrigerating compartment temperature detecting means (57) to operate the switch means (62) to energize the electromagnetic coil (36A). The compartment temperature control means (58) judges the temperature range of the temperature (TH) based on the information from the compartment temperature detection means (56) and drives the step motor (38) to close it. Except for (40a), the switching means (61) operates to energize the motor (16M), but when the output of the comparator (47) is "", the switching means (61)
Operates by lowering the rotation speed of the motor (16M).

5 to 7 are flowcharts showing the software of the microcomputer (45), and the operation will be described along with it. Fig. 5 is a flowchart of the temperature control of the freezer compartment (F), where (TH _N ) is the current temperature of the freezer compartment (F) and (TF
_N-1 ) is the temperature at the last sampling, and sampling is performed at power-on and when crossing each set temperature, and after processing work is performed, the temperature at the last sampling (TF _N-1 ) Instead of, the current temperature (TF _N ) shall be stored. Hereinafter, the same applies to the temperature (TR) of the refrigerator compartment (R) and the temperature (TH) of the compartment (H). At the step (S ₁ ), the current temperature (TF _N ) is the upper limit temperature (T _N ) such as −18 ° C.
If it is more than F _ON ), (V ₅ )> (V ₂ ) and the input terminal (IN ₂ ) of the microcomputer (45) is “h”, so proceed to step (S ₂ ), and output terminal (OUT ₁ ) (OUT ₄ ) is "l"
Then, the triac (41) and the transistor (44) are triggered to operate the compressor (26) and the blower (16) to execute the cooling operation. This cooling operation lowers the temperature (TF) (TF
_If it falls below _ON ), the process proceeds from step (S ₁ ) to step (S ₃ ) where it is compared with the lower limit temperature (TF _OFF ) such as -22 ° C. If it is higher than that, the process proceeds to step (S ₄ ) and the previous sampling Time temperature (TF _N-1 ) and (TF _OFF ) are compared. At this time, (TF _N-1 ) was higher than (TF _ON ), so step (S
₄ ) to (S ₂ ), the cooling operation is continued, and (TF) continues to drop, but when (TF _OFF ) or less, (V ₂ )> (V ₅ ) and the input terminal (IN ₂ ) becomes since the "l", the flow proceeds to step (S _5), executes the temperature control described later compartment (H), the step (S ₆₎ at the output terminal (OUT ₁₎ is a compressor becomes "h" ( 26) Stop. After that, the temperature (TF) of the freezer compartment (F) gradually rises to (TF _OFF ) or more, and the process proceeds from step (S ₃ ) to (S ₄ ) at this time (TF _N-1 ) (TF _OFF ). Since it is the following, proceed from step (S ₅ ) to (S ₆ )
(26) remains stopped. After that, it rises further (TF
_{From (ON} ) to the above step (S ₁ ) to (S ₂ ), the cooling operation is restarted, and the above is repeated to cool the inside of the freezing compartment (F) to, for example, -20 ° C on average.

FIG. 6 is a temperature control flowchart of the refrigerating room (R). When the current temperature (TR _N ) is higher than the upper limit temperature (TR _ON ) such as + 5 ° C. in step (S ₇ ), (V ₆ )> ( Since V ₃ ) and the input terminal (IN ₃ ) is “h”, the process proceeds to step (S ₈ ), the electromagnetic damper (36) is opened and cold air is supplied into the refrigerating compartment (R).
After that, when (TR _N ) becomes less than (TR _ON ), the process proceeds from (S ₉ ) to (S ₁₀ ), and at this time (TR _N-1 ) is above (TR _ON ), the process proceeds to step (S ₈ ). The electromagnetic damper (36) remains open. After that, (TR _N ) becomes (TR
_OFF ) When it is less than or equal to (V ₃ )> (V ₆ ), the input terminal (IN ₃ )
There close the electromagnetic damper (36) is advanced from the "l" and step (S ₉₎ to (S ₁₁₎ output terminal (OUT ₃₎ is a "h". After that, even if (TR _N ) becomes (TR _OFF ) or more again, (TR _{N -1} ) was below (TR _OFF ), so step (S
Proceed from ( ₁₀ ) to (S ₁₁ ) and the electromagnetic damper (36) remains closed. After that, when (TR _N ) becomes (TR _ON ) or more, (V ₆ )
> (V ₃₎ and since again proceeds from step (S ₇₎ to (S ₈₎ opening the electromagnetic damper (36). Repeat this to the refrigerator room
The inside of (R) is maintained at + 3 ℃.

Next, the temperature control of the compartment (H) in FIG. 7 will be described with a flowchart. Current temperature (TH _N ) in step (S ₁₂ )
When is above (TH ₀ ) (0 ° C.), the process proceeds to step (S ₁₃ ), and the control circuit (43) operates the step motor (38) in two steps from the closed state to the fully open state. Next Step (S ₁₄ )
Check if the compressor (26) is in operation. If it is in operation, proceed to step (S ₁₅ ) to operate the blower (16) as it is, and if it is stopped, proceed to step (S ₁₆ ). Then, the output "l" pulse width from the output terminal (OUT ₄ ) is reduced to reduce the rotation speed of the blower (16) to operate. Discharge port in this state
A large amount of cold air flows in from (20a), and the compartment (H) is rapidly cooled. If (TH _N ) falls below (TH _O ) due to this cooling, the process proceeds from step (S ₁₂ ) to (S ₁₇ ), but (TH _N ) becomes (T
H ₁ ) goes to the higher step (S ₁₈ ). At this time (T
Since (H _N-1 ) is (TH ₀ ) or more, the process proceeds to step (S ₁₃ ), and the damper device (35) continues to be cooled while being fully opened. Then, when (TH _N ) becomes lower than (TH ₁ ) (-1 ° C), the process proceeds from step (S ₁₇ ) to (S ₁₉ ) to step (S ₂₀ ), where (TH _N-1 ) is (TH ₁ ) It was above, so step (S
_In step ₂₁ ), the step motor (38) is reversely rotated by one step to the intermediate open state, and thereafter steps (S ₁₄ ) to (S ₁₆ ) are executed. This slows down the cooling rate of the compartment (H). After that, when cooling gradually progresses and (TH _N ) falls below (TH ₂ ) (-2 ° C), the process proceeds from step (S ₁₉ ) to step (S ₂₂ ) and the damper device (35) is moved by the step motor (38). close the operation to the discharge port (20a), then the compressor in step (S ₂₃₎ (2
It is determined whether or not 6) is in operation, and the blower (16) is directly operated during the operation or in step (S ₂₄ ), and if stopped, the blower (16) is stopped in step (S ₂₅ ). As a result, the supply of cold air to the cold air passage (10) is stopped, so that the temperature (TH) of the compartment (H) begins to rise again, and becomes higher than (TH ₂ ) again from step (S ₁₉ ) to step (S ₂₀ ) However, since (TH _N-1 ) was naturally lower than (TH ₁ ) at this time, the operation proceeds to step (S ₂₂ ), and the damper device (35) remains closed, and the temperature (TH) rises. If (TH ₁ ) or more, the process proceeds from step (S ₁₇ ) to (S ₁₈ ) but (TH _N-1 )
Is lower than (TH ₀ ), go to step (S ₂₁ ), open the damper device (35) in the middle open state and execute steps (S ₁₄ ) to (S ₁₆ ), and gradually cool air from the discharge port (20 a). Start to introduce. As a result, the temperature (TH) rises slowly, and when it gradually rises to (TH ₀ ) or higher, the process proceeds from step (S ₁₂ ) to (S ₁₃ ) and the damper device (35) is fully opened. Steps (S ₁₄ ) to (S ₁₆ ) are performed, and a large amount of cold air is introduced into the cold air passage (10) to strongly cool the compartment (H). After that, this is repeated. As a result, the inside of the compartment (H) is cooled on average at about -1 ° C. Here, this -1 ° C is the ice storage temperature of meat and fish. This ice temperature storage temperature is a temperature zone below freezing, but the goods do not freeze, storing food at this temperature does not impair the flavor, does not require thawing, and is for a long time (in the experiment It can be stored for about a week).

As described above, the inside of the compartment (H) is maintained at the ice temperature storage temperature by the indirect cooling from the cold air passage (10), so that the food can be stored for a relatively long period of time without impairing the flavor. Further, since the cooling is indirect, the drying of food is also suppressed. Further, the temperature of the compartment (H) is accurately controlled by the damper device (35), and when the damper device (35) is opened, the blower (16) is operated even when the compressor (26) is stopped. Even when the freezer compartment (F) is sufficiently cooled and the thermal load on the compartment (H) increases, the compartment
Insufficient cooling in (H) does not occur. Further, when the compressor (26) is stopped and the damper device (35) is opened, the blower (16) is operated at a reduced rotation speed, so that the supercooling of the freezer compartment (F) is reduced. Furthermore, the damper device (35) gradually changes the opening of the discharge port (20a) to allow a large amount of cold air to flow in near the upper limit temperature and to reduce the amount of cold air flowing in near the lower limit temperature. , It is possible to control the temperature of the compartment (H) more stably than the control of closing only at the lower limit temperature, because it exceeds the upper limit temperature or becomes lower than the lower limit temperature, so-called overshoot and undershoot amount becomes smaller. It is a thing.

(F) According to the present invention, according to the temperature control device, when the judgment result by the control means is in a downward trend, when the temperature of the compartment is equal to or higher than the set temperature, the temperature detected by the freezer compartment sensor Regardless of the above, the blower is operated at a rotational speed lower than a predetermined rotational speed and the damper device is fully opened, and when the temperature is equal to or higher than the lower limit temperature and less than the set temperature, the damper device is in the medium open state, and when the temperature is lower than the upper limit temperature, When the damper device is closed and the result of judgment by the control means tends to rise, the damper device is closed when the temperature of the compartment is below the set temperature, and the damper device is closed when the temperature is above the set temperature and below the upper limit temperature. Since the damper device is fully opened when the temperature is higher than the upper limit temperature, the opening state of the damper device changes stepwise based on the temperature of the compartment and the flow rate of cold air to the cold air passage changes stepwise. Can be made. In particular, food with a larger heat capacity than the compartment sensor changes temperature later than the sensor, so even if the temperature detected by the sensor is the same, there is a difference in the temperature of the food when the temperature change rises and when the temperature changes. The amount of heat required for cooling the food (that is, the amount of cold air) is different between the rising time and the falling time. However, according to the present invention, the opening degree of the damper device is made different between the rising time and the falling time. It is possible to control the flow rate of cold air according to the amount of cold air required for cooling, and even when the damper device is open, the blower speed is reduced even if the temperature of the freezer falls below the set temperature and the compressor stops. Since the damper device is operating, the residual cooling power can be recovered from the refrigerant remaining in the cooler by the damper device and supplied to the cold air passage, resulting in insufficient supply of cold air to the cold air passage of the compartment and insufficient cooling of the compartment. Eliminate and partition It is possible to quickly cool the. Based on these, the temperature control accuracy of the compartment is improved as compared with the conventional case, and it becomes easier to stabilize the temperature of the compartment in the ice temperature storage temperature zone having a relatively narrow temperature range.

[Brief description of drawings]

Each drawing shows an embodiment of the present invention. FIG. 1 is an enlarged sectional view of the rear part of the compartment, FIG. 2 is an electric circuit diagram, and FIG.
FIG. 4 is a diagram showing the output state of the comparator (46), FIG. 4 is a functional block diagram of FIG. 2, and FIGS. 5 to 7 are flowcharts showing the software of the microcomputer.
FIG. 8 is a schematic side sectional view of the refrigerator, and FIG. 9 is a diagram showing a time transition of compartment temperature. (H) ... compartment, (10) ... cool air passage, (15) ... cooler,
(16) …… Blower, (38) …… Step motor, (40) …… Baffle plate, (49) …… Thermistor.

Front page continuation (72) Inventor Yasuo Ogoshi 180 Sakata, Oizumi-machi, Ora-gun, Gunma Tokyo Sanyo Electric Co., Ltd. (56) References: 58-87083

Claims (1)

[Claims] 1. A temperature control device for controlling on / off of a blower at a predetermined rotation speed based on a temperature of a freezing compartment detected by a freezing compartment sensor, a compartment formed in the heat-insulating box in a substantially sealed manner, and the compartment. A refrigerator having a cool air passage formed around the compartment for indirectly cooling the compartment, and a damper device for controlling the cool air passage to the cool air passage based on a compartment sensor that detects a temperature in the compartment. In the above, a control means is provided for determining whether the temperature of the compartment is a rising tendency or a falling tendency by respectively setting a constant temperature higher upper limit temperature and a constant temperature lower lower limit temperature with respect to the set temperature of the compartment.
The temperature control device, when the determination result in the control means is in a downward trend, when the temperature is equal to or higher than the set temperature, the blower is rotated at a speed higher than the predetermined rotation speed regardless of the temperature detected by the freezer compartment sensor. While operating at a low rotation speed, the damper device is fully opened, and when the lower limit temperature or more and less than the set temperature, the damper device is in the middle open state,
When the temperature is lower than the upper limit temperature, the damper device is closed, and when the judgment result in the control means tends to increase, when the temperature is lower than the preset temperature, the damper device is closed, and the temperature is higher than the preset temperature and lower than the upper limit temperature. The refrigerator is characterized in that the damper device is opened in a middle state and the damper device is opened in a full state when the temperature is equal to or higher than an upper limit temperature.