JP3126075B2 - Storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a storage for performing refrigeration or warming while keeping the inside of a storage within a predetermined temperature range.

[0002]

2. Description of the Related Art Conventionally, this type of storage has been
A refrigerator disclosed in Japanese Patent Application Laid-Open No. 4-24993 is known. The refrigerator shown in the publication has a convection fan in the refrigerator,
The convection fan operates until the temperature in the refrigerator drops to a predetermined temperature. When fresh food or the like to be refrigerated is stored, the air in the refrigerator is forcibly convected so that the temperature of the fresh food falls within the range of the storage temperature at an early stage. Also disclosed is a configuration in which the convection fan operates for a predetermined time after opening and closing the door.

[0003]

The above-mentioned conventional storage has the following problems. Because there is a difference between the specific heat of fresh food and the specific heat of the air in the refrigerator, the convection fan stops when the temperature of the air in the refrigerator drops to a predetermined temperature even if the temperature of the fresh food does not drop sufficiently. Resulting in. Therefore, the food is cooled in a calm state thereafter, and it takes time for the core temperature of the fresh food to decrease. The degree to which the inside temperature rises varies depending on the time of opening and closing the door and the temperature of the outside air, and the temperature, amount, and form of the food to be stored are various. Even if it is operated only for a predetermined time, it is not always possible to sufficiently cool to the core temperature.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide a storage that can quickly reach a storage temperature up to the core temperature of a stored item.

[0005]

As means for achieving the above object, the present invention according to claim 1 is an invention for providing a storage for keeping the inside of a storage within a predetermined temperature range, in a storage for circulating air in the storage. A fan, instruction means for instructing the start of operation of the internal fan, a temperature sensor for detecting an internal temperature, and a predetermined temperature range in which the internal temperature detected by the temperature sensor is based on a holding temperature. Means for counting the time to maintain the inside, and when the operation of the in-compartment fan is started from when the operation start is instructed by the instruction means, and when the time measured by the time measurement means reaches a predetermined time. An internal fan control circuit for stopping the operation of the internal fan.
And said timing means is adapted to determine that said predetermined temperature range is
If the timer does not continue for the specified time, reset the clock
It has a configuration having functions .

[0006]

According to the first aspect of the present invention, when the instructing means instructs the start of the operation of the in-compartment fan, the in-compartment fan control means activates the in-compartment fan. On the other hand, the temperature sensor detects the temperature inside the refrigerator,
The timer measures the duration of the duration only while the temperature inside the refrigerator detected by the temperature sensor is within a predetermined temperature range based on the holding temperature. Then, the internal fan stops the operation of the internal fan when the duration time measured by the timing means reaches a predetermined time.

That is, although the internal fan continues to operate, only while the temperature of the internal air stays within the predetermined temperature range contributes to keeping the stored item at the predetermined temperature. , This period is timed.

[0008]

As described above, according to the present invention, the operation time of the internal fan is determined based on the substantial time contributing to the temperature change of the stored item. On the other hand, it is possible to provide a storage that can drive the internal fan for as short a time as possible.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partially cutaway top view. In the figure, the refrigerator main body includes an insulating box 10 and a storage box 20.
The heat insulation box 10 includes the inner wall of the outer box 11 and the inner box 1.
2 is filled with a heat insulating material 13 such as urethane foam, and a pair of left and right openings 14a, 1
4b are formed, and heat insulating doors 15a and 15b for opening and closing the openings 14a and 14b are attached so as to be openable and closable by hinges. In addition, this heat insulating door 1
Sealing members 15a1 and 15b1 are provided between 5a and 15b and the periphery of openings 14a and 14b to insulate them from the outside air.

The storage box 20 is formed of a metal plate material such as stainless steel, which is a heat conductive member, in a housing shape having an opening 21 on one surface.
The openings 14a and 14b of the heat insulating box 10 are fixed to and supported by the outer peripheral edge of the inner surface of the front wall as desired. At this time, the left and right side walls 22, 23, the top wall 24, the bottom wall 25, and the rear wall 26 of the storage box 20 are respectively held at predetermined intervals from the inner wall of the inner box 12 in the heat insulating box 10, and the gap is formed by the air flow. A circulation passage W is formed.

The two in-compartment fans 30 a and 30 b are each configured by fixing a fan 32 to the rotation axis of a fan motor 31, and are mounted on the left side wall 22 of the storage box 20. A cover 40 for forming an air flow path is attached to the front surfaces of the in-compartment fans 30a and 30b. The cover 40 has an exhaust port 41 formed at a portion facing the fan 32 and a lower portion. Is formed with a suction port 42. That is, the end of the upper side of the cover 40 is in contact with the upper wall 24, the end of the left side bent as an L-shaped cross section is in contact with the left side wall 22 of the storage box, and the end of the right side is the storage box 2
The lower side is in contact with the rear wall 26, and the lower side forms the suction port 42 with a predetermined gap from the left side wall 22.

The left side wall 2 of the storage box 20 in the heat insulating box 10
An evaporator 51 of a cooling mechanism 50 for performing cooling by the heat of vaporization of the refrigerant is fixed to a wall portion facing 2 so that its air flow path is directed vertically, and the evaporator 51 and the left side wall 22 of the storage box 20 are fixed to each other. The air circulation holes 6
1 and a shielding plate 60 in which a blower fan 62 is disposed in the air circulation hole 61 is fixed at the upper side thereof so as to hang down from the upper wall of the inner box 12 of the heat insulating box 10. A sufficient gap is formed between the lower side of the shielding plate 60 and the lower wall of the inner box 12, and an air cooling flow path communicating from the gap to the upper air flow hole 61 via the air flow path of the evaporator 51. Is formed.

As shown in FIG. 4, the cooling mechanism 50 includes a compressor 52 for compressing the refrigerant, a condenser 54 for condensing the compressed refrigerant under the air cooling action of the air cooling fan 53, and a condenser 54 for condensing the refrigerant. A dryer 55 for dehumidifying the refrigerant; a capillary tube 56 for converting the dehumidified condensed refrigerant into a low-temperature low-pressure refrigerant; 51 are housed in an auxiliary box 10a formed on the left side of the heat insulating box 10 except for the evaporator 51. In the figure, a hot gas valve 57 for supplying the high-temperature compressed refrigerant compressed by the compressor 52 during defrosting to the evaporator 51 is connected to the output side of the compressor 52 and the evaporator 5.
1 is connected to a conduit connecting the input side.

The compressor 52 includes a compressor motor 5
2a and a compression mechanism 52b driven by being connected to the rotation axis of the compressor motor 52a.
The driving of the compressor motor 52a is controlled by an electric control circuit 70 as shown in FIG. The electric control circuit 70 is connected to a commercial AC power supply and includes a main power switch 72 for opening and closing the commercial AC power supply and the internal power supply paths PW1 and PW2. The following series circuits S1 connected to PW1 and PW2
The power supply to S6 is controlled.

The series circuit S1 is composed of a parallel circuit comprising a make contact R1-1 of the relay R1 and a make contact R3-2 of the relay R3, and a series circuit comprising a break contact R3-1 of the relay R3 and the air cooling fan 53. Compressor motor 5
2a is connected in series with a parallel circuit in which 2a are connected in parallel. The series circuit S2 is disposed in the chamber RM, and is turned on at the first upper limit set temperature T1 during the temperature rise, and slightly lower than the first upper limit set temperature T1 during the temperature drop. Temperature sensor Th that is turned on and off in a hysteretic manner so as to be turned off at one lower limit set temperature B1
1 and the electromagnetic coil of the relay R1 are connected in series.

The series circuit S3 is disposed in the room RM,
During the temperature rise, the second lower limit temperature T2 lower than the first lower limit temperature B1 is turned off, and during the temperature decrease, the second lower limit is slightly lower than the second upper limit temperature T2. A temperature sensor Th2 that is turned on / off in a hysteretic manner so as to be turned on at a set temperature B2, and an electromagnetic coil of a relay R2 are connected in series.

The series circuit S4 is constituted by connecting in series a make contact R2-1 of the relay R2 and a parallel circuit comprising the hot gas valve 57 and the electromagnetic coil of the relay R3. The series circuit S5 mainly includes a timer TM. The timer TM has a reset input for starting timekeeping.
Turns on. Further, the timer motor TMM measures the time during energization, and turns off the timer contact TM1 when measuring a preset time. Here, the reset input is connected between the power supply paths PW1 and PW2 in series with a parallel circuit including a selection switch SW composed of a self-return type push button switch and a make contact R2-3 of the relay R2. The motor TMM is connected between the power supply paths PW1 and PW2 in series with the break contact R2-2 of the relay R2, and the timer contact TM1 is connected to the internal fans 30a and 30b.
Is connected between the power supply paths PW1 and PW2 in series with a parallel circuit consisting of In the series circuit S6, the blower fan 62 is connected between the power supply paths PW1 and PW2.
The temperature sensors Th1 and Th2 are respectively mounted above the chamber RM, and the selection switch SW is provided on the front of the auxiliary box 10a.

Next, the operation of the present embodiment having the above configuration will be described. After the refrigerator is installed, the main power switch 72
Is turned on, the internal temperature T is equal to or higher than the first upper limit set temperature T1, so that the temperature sensor Th1 is turned on to energize the exciting coil of the relay R1. Then, make contact R1-1 in series circuit S1 is turned on. on the other hand,
Since the temperature sensor Th2 is turned off, the excitation coil of the relay R2 is not energized, and the make contact R2-
1 is also turned off, and the excitation coil of the relay R3 is not energized. Therefore, the break contact R3-1 in the series circuit S1
Is on, and the make contact R3-2 is off. As a result, in the series circuit S1, the compressor motor 52
a and the cooling fan 53 are energized, and the cooling mechanism 50 is started.

On the other hand, at the same time when the main power switch 72 is turned on, the blower fan 62 also starts blowing, and the air flows through the air passage of the evaporator 51 from the gap between the lower side of the shield plate 60 and the lower wall of the inner box 12. The air is sucked, and the sucked air starts to be blown from the air circulation holes 61 to the air circulation path W formed around the storage box 20. Therefore, the cooling mechanism 5
When the air blower 0 starts, the air sucked by the blower fan 62 exchanges heat when passing through the air flow path of the evaporator 51, and the cooled air flows from the air circulation holes 61 to the air circulation formed around the storage box 20. The air is sent to the passage W.

Since the storage box 20 is formed of a heat conductive member, when the cooled air is blown to the outer periphery, each wall 22 is formed.
Heat exchange is performed at -26, and the temperature in the refrigerator in the chamber RM gradually decreases. When the inside temperature T falls below the first lower limit set temperature T1 and further falls below the first lower limit set temperature B1, the temperature sensor Th1 is turned off, and the power supply to the exciting coil of the relay R1 is stopped. 1
Is turned off, the power supply to the compressor motor 52a and the air cooling fan 53 is stopped, and the cooling operation of the cooling mechanism 50 is released.

When the cooling operation is released, the internal temperature T gradually rises due to heat entering from the outside. When the temperature exceeds the first lower limit temperature B1 and further exceeds the first upper limit temperature T1, the temperature sensor Th1. Is turned on, and the cooling operation is started again as described above. Normally, as shown in a period P1 in FIG. 6, control is performed so that the inside temperature T is maintained within the range between the first upper limit set temperature T1 and the first lower limit set temperature B1.

It is assumed that the frozen mass at about -30 ° C. is accommodated in the chamber RM when the inside temperature T of the chamber RM is kept within the above range. Insulated door 15a at timing a in FIG.
Is opened, the frozen lump is stored at the timing b, the frozen lump is stored at the timing c, and the selection switch SW is pressed. Then, during this time, warm air outside the refrigerator enters the room RM, and the temperature T in the refrigerator rises as shown in the figure, and the cooling mechanism 50 starts operating.

On the other hand, since the push-button selection switch SW is pressed at the timing c, the reset input of the timer TM is energized, the timer motor TMM in the timer TM starts measuring time, and the timer contact TM1 is turned on. To energize the internal fans 30a and 30b. Then, in addition to the cooling mechanism 50 cooling the inside of the room RM from the outer periphery, the in-compartment fans 30a and 30b send air in the incubator to the frozen mass, so that the air takes cold energy from the surface of the frozen mass and Cooled by the surrounding wall material, the internal temperature T sharply decreases.

When the inside temperature T falls below the first lower limit set temperature B1 at the timing d, the operation of the cooling mechanism 50 is stopped, but the inside fans 30a and 30b circulate air in the inside of the freezer, and Is cooled on the surface of the container, and the internal temperature T further decreases. When the temperature falls below the second lower limit set temperature B2 at the timing e, the temperature sensor Th2 is turned on and the exciting coil of the relay R2 is energized, so that the make contact R2-1 is turned on, and the hot gas valve 57 and the relay are turned on. The excitation coil of R3 is energized.

In the series circuit S1, the break contact R3-
1 is turned off and the make contact R3-2 is turned on, so that the compressor motor 52a starts operating with the hot gas valve 57 opened, and the high-temperature refrigerant compressed by the compressor 52 is discharged from the hot gas valve 57. Is sent to the evaporator 51 via the. Then, the temperature of the evaporator 51 becomes high, and the air in the airflow circulation passage W is heated and
Since the inside of M is heated from the outer periphery, the internal temperature T starts to gradually increase.

When the exciting coil of the relay R2 is energized at the timing e, the break contact R2-2 becomes non-conductive, so that the energization of the timer motor TMM is stopped, and the timer motor TMM measures the time t1. And stop timing. At the same time, the make contact R2-3 becomes conductive and resets, so that the reset input of the timer TM is energized, and the time count returns to "0". However, even after resetting, the timer contact TM1 is conducting, and the internal fans 30a and 30b are operating.

On the other hand, when the heat-insulating door 15a is opened at the timing f, warm air outside the refrigerator enters the room RM, so that the temperature T inside the refrigerator rises, and at the timing g, the second upper limit set temperature T1. Is exceeded, the temperature sensor Th2 is turned off. Then, the power supply to the exciting coil of the relay R2 is stopped, and the make contact R2-1 becomes non-conductive.
Is closed, the power supply to the relay R3 is stopped, and the compressor motor 52a stops operating. Further, the make contact R2-3 becomes non-conductive and the reset of the timer TM ends, while the break contact R2-2 becomes conductive and the timer motor TMM restarts time measurement from the initial value.

While the heat-insulating door 15a is open, the inside temperature T
Further rises, and the cooling mechanism 50 starts operating at a timing h exceeding the first upper limit set temperature T1. However, when the heat-insulating door 15a is closed at the timing i, the inside temperature T starts to decrease again, and the cooling mechanism 50 stops the operation at the timing j when the temperature reaches the first lower limit set temperature B1 in the same manner as described above. Heating is started at timing k when the temperature reaches the second lower limit set temperature B2, and the timer TM again stops measuring time.

By the way, the frozen lump is stored in the internal fans 30a, 3
The air in the refrigerator is blown by the action of Ob, and the temperature is rising because the cold is gradually taken away. Therefore, the inside temperature T does not decrease as much as the beginning, and when heating is started, the temperature of the frozen mass also increases, and the inside temperature T starts to increase. At the timing 1 when the internal temperature T rises and reaches the second upper limit set temperature T2, the heating is stopped and the timer T
M resumes timing.

Thereafter, the frozen mass does not have enough heat to reduce the air inside the refrigerator, and
The cold heat is dissipated in the atmosphere where the air is circulated at a and 30b. Then, at the timing m, the timer motor T
The MM clock time t3 is a predetermined clock time t
When x is reached, the timer contact TM1 becomes non-conductive and stops supplying power to the internal fans 30a, 30b, so that the internal fans 30a, 30b stop operating. As a result, the interior of the room RM is kept in a windless state thereafter, and the easily dried food can be stored in a high-humidity atmosphere.

The operation of the internal fans 30a and 30b is timed when the internal temperature T is higher than the second lower limit temperature B2 or the second upper limit temperature T2. Therefore, it can be said that only the time that contributes to bringing the frozen mass closer to the original holding temperature is measured, and otherwise the time is not measured. Therefore, it is possible to circulate the air in the refrigerator only for the shortest period while excluding the period in which the degree of contribution is low, and to surely bring the contents closer to the original holding temperature early.

In this embodiment, the cooling operation of the cooling mechanism 50 is controlled by the wire logic having the on / off type temperature sensors Th1 and Th2.
In addition to using the temperature sensor Th3 for measuring the temperature, software control is performed by a microcomputer, and the temperature can be controlled based on the detection result of the temperature sensor Th3.

FIG. 7 is a block diagram showing a configuration of an electric control circuit 80 for performing such software control. In the figure, a CPU 81 is arranged in the electric control circuit 80, executes a program corresponding to the flowcharts shown in FIGS. 8 to 10 to control the operation of the internal fan, and executes a temperature control (not shown). Note that the selection switch SW connected to the electric control circuit 80 and the internal fans 30a, 30
The b, the compressor motor 52a, the hot gas valve 57, and the blower fan 62 are the same as those in the above-described embodiment, and the temperature sensor Th3 measures the inside temperature T and outputs the measurement result.

The CPU 81 executes a fan operation start routine shown in FIG. 8 and an end determination routine shown in FIG. 9 in parallel with the temperature control, and executes a time measurement routine shown in FIG. Running. In the initial setting, "0" is set in a flag Ffn indicating whether or not the in-compartment fans 30a, 30b are operating, and "0" is set in a flag Ftm indicating whether the timer is operating.
0 "is set. The measurement result of the temperature sensor Th3 is set to a variable Vth.

In the fan operation start routine, the CPU 81
Determines in step 100 whether the selection switch SW has changed from on to off, and if there is no change, ends this processing without doing anything. However, when the user presses and releases the push-button selection switch SW, the selection switch SW changes from ON to OFF.
0a and 30b are activated, and at step 120, the flag Ftm is set to "1" and the flag Ffn is set to "1".
Is set, and at step 130, the value of the variable Vtm representing the clock time is cleared to "0".

The variable Vtm is set to "1" at step 410 when it is determined in step 400 of the clocking routine executed in the interrupt processing at predetermined time intervals that the timer is operating from the state of the flag Ftm. Only be increased. Therefore, the value of the variable Vtm represents the time measured. After the end of the fan operation start routine, the CPU 81 determines whether or not the internal fans 30a and 30b are operating from the state of the flag Ffn in step 200 of the end determination routine. If the flag Ffn is set to "0", the internal fan 30a,
30b is not operating, but if the flag Ffn is set to "1", the in-compartment fans 30a and 30b are operating, so it is determined whether or not the condition for terminating has been reached in the following. . The condition is that the time counted by the timer is equal to or longer than a predetermined time. At the same time, it is determined whether or not the time counted by the timer is satisfied, and the flag Ftm is set.

The CPU 81 determines in step 210 that the variable Vth
It is determined whether the internal temperature T is equal to or higher than the second upper limit set temperature T2 based on the value of. Determine whether or not. If the time is low, the flag F is set at step 230 in order not to perform timing.
tm is set to "0" and the process is terminated, and if it is between the second upper limit set temperature T2 and the second lower limit set temperature B2, the process is terminated without any operation. If the flag Ftm
If "0" is set, the value of the variable Vtm is cleared to "0" in step 420 of the timing routine. In this embodiment, the second upper limit set temperature T2 and the second lower limit set temperature B2 are different from each other by about 0.1 to 0.2 ° C.

On the other hand, if the internal temperature T is equal to the second upper limit set temperature T
If it is 2 or more, step 240
Sets "1" to the flag Ftm. This is because there is a possibility that the condition for terminating the timing in this determination may have been resolved. Thereafter, in step 250, it is determined whether or not the value of the variable Vtm has exceeded the value of Xtm representing the time of the end of time measurement. As a result, if the time for ending the time has elapsed, the internal fans 30a and 30b are stopped via the electric control circuit 80 in step 260, and
At 0, the flag Ftm is set to "0" and the flag Ffn is set to "0", and the process is terminated. If the time for ending the timing has not yet elapsed, the present processing is terminated.

By the way, in the above-described embodiment, since it is assumed that the frozen mass is thawed, the time is always measured at a predetermined temperature or higher so as to contribute to the thawing. But,
In order to bring the contents held outside the refrigerator to the original holding temperature range, the temperature T in the refrigerator must be between the first upper limit setting temperature T1 which is the holding temperature range and the first lower limit setting temperature B1. The contribution of the time to blow in a certain state is large.

FIG. 11 shows an end judgment routine for judging under such conditions, which is executed together with the fan operation start routine shown in FIG. 8 and the clocking routine shown in FIG.
The CPU 81 determines in step 310 whether or not the inside temperature T is higher than the first upper limit set temperature T1. If the temperature is higher than the first upper limit set temperature T1, the CPU 81 determines that the temperature is out of the holding temperature range and stops the time measurement in step 320. Is set to "0". On the other hand, the internal temperature T is lower than the first upper limit set temperature T1,
If the temperature is lower than the first lower limit set temperature B1, it means that the temperature is out of the holding temperature range.
It is determined whether or not the internal temperature T is lower than the first lower limit set temperature B1. If the temperature is lower, the flag Ftm is set to "0" at step 320 to stop the timing. In any case, the value of the variable Vtm is cleared by setting the flag Ftm to "0", and the timer starts counting from "0" when the timer restarts.

If the internal temperature T is within the holding temperature range, C
The PU 81 resets the flag Ftm to "1" at step 340, and determines at step 350 whether or not the value of the variable Vtm has exceeded the value of Xtm representing the time of the end of time measurement. As a result, if the time of the end of the time has elapsed, the electric control circuit 80 is executed at step 360 in the same manner as in the above-described embodiment.
To stop the in-compartment fans 30a and 30b via the command, and set the flag Ftm to "0" and the flag Ffn to "0" at step 370, respectively, if the time for ending the timing has not elapsed yet. If this is the case, the process ends.

FIG. 12 shows a case where a food which is held outside the refrigerator and has the same temperature as the temperature outside the refrigerator is stored. That is, if the heat insulation door 15a is opened and food is stored at the timing n and the selection switch SW is pressed and released, the internal temperature T rises most at the same timing n, and the cooling mechanism 50 starts the cooling operation. At the same time, the in-compartment fans 30a and 30b operate to circulate the air in the in-compartment. Although the temperature T in the refrigerator gradually decreases, the time measurement is stopped at first because the temperature is outside the holding temperature range. Then, when the temperature reaches the holding temperature range at the timing o, the timer starts, and the in-compartment fans 30a, 30b are stopped at the timing p at which the clocking time has elapsed a predetermined time represented by Xtm.

When the temperature reaches the holding temperature range, the internal fan 3
0a and 30b are stopped, the temperature of the food slowly decreases as indicated by the two-dot chain line. , 30b, the holding temperature is quickly approached as indicated by the chain line. On the other hand, when a frozen lump is stored, it becomes as shown in FIG. That is, when the container is stored at the timing q, the internal temperature T sharply decreases, and enters the holding temperature range at the timing r to start timekeeping. However, immediately outside the holding temperature range at the timing s, the timing stops. . Then, when the temperature enters the holding temperature range again at the timing t, the timer starts again, and the in-compartment fans 30a and 30b are stopped at the timing u at which a predetermined time (t5 = tx) has elapsed. Also in this case, when the temperature enters the holding temperature range, the internal fans 30a, 3
If 0b is stopped, the temperature of the frozen mass slowly rises as indicated by the two-dot chain line and it takes time to finish thawing, but it is in the holding temperature range as in the present embodiment. By judging the time and operating the in-compartment fans 30a and 30b, the temperature of the frozen mass rises early as indicated by the chain line and is thawed.

As described above, according to the present embodiment, even when food having a temperature higher than the holding temperature is stored, it is also possible to store food having a temperature lower than the holding temperature range. However, since the in-compartment fans 30a, 30b are operated based on the time in the holding temperature range, the time that contributes to approaching the holding temperature range is determined more appropriately, and the in-compartment fans 30a, 30b are stopped. Can be.

In this embodiment, the control is performed by software. However, as shown in the previous embodiment, the control can be performed by a wire logic having an on / off type temperature sensor. Further, in the above-described embodiment, the push-button selection switch SW operated by the user is used.
However, a door switch for detecting opening and closing of the heat insulating doors 15a and 15b may be provided. With such a configuration, when the heat-insulating doors 15a and 15b are opened and closed, a condition occurs in which the door switch changes from on to off, and acts in the same manner as when the selection switch SW is operated. Therefore, it is possible to prevent the user from forgetting to operate the selection switch SW.

Also, a dip switch, a rotary encoder, and the like may be provided for the clocking time so that the CPU 81 can read and change the time.

[Brief description of the drawings]

FIG. 1 is a front view of a refrigerator according to one embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the refrigerator.

FIG. 3 is a partially cutaway top view of the refrigerator.

FIG. 4 is a diagram illustrating a configuration of a cooling mechanism.

FIG. 5 is a circuit diagram of an electric control circuit.

FIG. 6 is a diagram showing a state of temperature control.

FIG. 7 is a block diagram of an electric control circuit that performs software control.

FIG. 8 is a flowchart of a fan operation start routine.

FIG. 9 is a flowchart of an end determination routine.

FIG. 10 is a flowchart of a timing routine.

FIG. 11 is a flowchart of another end determination routine.

FIG. 12 is a diagram showing a state of temperature control.

FIG. 13 is a diagram showing a state of temperature control.

[Explanation of symbols]

Reference numeral 20: storage box, 30a, 30b: internal fan, 50: cooling mechanism, 70, 80: electric control circuit, 81: CPU, S
W: selection switch, T1: first upper limit set temperature, B1 ...
First lower limit set temperature, T2... Second upper limit set temperature, B2
... second lower limit set temperature, TM ... timer, Th1, Th
2, Th3: temperature sensor.

Claims (1)

(57) [Claims] 1. A storage for keeping the inside of a refrigerator within a predetermined temperature range, a fan in the refrigerator for circulating air in the refrigerator, an instruction means for instructing the start of operation of the fan in the refrigerator, and detecting a temperature in the refrigerator. A temperature sensor that performs the operation, a time measuring unit that measures a time for maintaining the inside temperature detected by the temperature sensor within a predetermined temperature range based on the holding temperature, and an instruction to start the operation by the instruction unit. An internal fan control circuit for activating the internal fan from time to time and stopping the operation of the internal fan when the time counted by the timing means has reached a predetermined time ; and However, when the predetermined temperature range is the predetermined time
Has a function to reset the clock if it does not continue
Reservoirs, characterized by that.