JP7262622B2 - refrigerator - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to a refrigerator having a controller.

Refrigerators that store foods and the like in a supercooled state are conventionally known. In addition, it is known that the lower the average storage temperature, the longer the storage period of food and the like during the storage period. Therefore, food and the like stored in such a refrigerator can be stored for a long period of time, requires less effort for thawing, and is less likely to deteriorate due to thawing, such as the outflow of nutrients. However, the supercooled state is an unstable state. That is, food and the like may be released from the supercooled state and frozen due to the vibration caused by the opening and closing of the door of the refrigerator, for example. Patent Literature 1 discloses a refrigerator in which a cushioning member is provided between an inner wall of the refrigerator and a storage portion that is stored inside the refrigerator and in which foodstuffs and the like are placed. The refrigerator of Patent Document 1 thereby suppresses vibrations from being transmitted to stored food and the like when the door is opened and closed. In this manner, Patent Document 1 attempts to maintain a supercooled state of stored food or the like by suppressing transmission of vibration to the food or the like.

JP 2013-148326 A

However, the refrigerator disclosed in Patent Document 1 is operated so that food and the like are in a supercooled state even during the hours when the user uses the refrigerator. The refrigerator disclosed in Patent Document 1 sends cool air to the storage compartment when the door is opened in order to cope with the temperature rise caused by the inflow of air from the outside of the refrigerator. That is, the storage chamber is subject to rapid temperature changes. In general, a supercooled state of food or the like may be released by a rapid temperature change. Therefore, the refrigerator disclosed in Patent Literature 1 is susceptible to abrupt temperature changes due to opening and closing of the door, which freezes stored foods and the like.

The present disclosure has been made to solve the above-described problems, and provides a refrigerator that maintains a supercooled state of stored food, etc., and operates such that the food, etc. does not freeze.

The refrigerator according to the present disclosure includes a box-shaped heat-insulating box body having a storage chamber in which an object to be cooled is stored, the front surface of which is covered with a door, and a heat-insulating box provided in the heat-insulating box to adjust the temperature of the storeroom. a temperature control unit provided in the heat insulating box for controlling the temperature control unit ; a door opening detection unit provided in the heat insulating box for detecting the number of times the door is opened, which is the number of times the door is opened; and the control unit adjusts the temperature of the storage chamber so that the temperature of the object to be cooled is below the freezing point during the non-use time period, which indicates the time period when the door is not frequently opened and closed. The target temperature, which is the target temperature at the time, is set to a supercooling temperature, which is a temperature lower than the normal temperature , which is a predetermined temperature, and the time period in which the number of door openings detected by the door opening detection unit is less than the threshold is set. Set as a non-use time zone, and other than the non-use time zone, days with a time zone where the number of times the door is opened are within the predetermined special threshold range are days when a special temperature is set as the target temperature. Set as control date .

According to the present disclosure, a refrigerator cools an object to be cooled, such as food, to a temperature below the freezing point during periods of non-use. During non-use hours, the user has few opportunities to use the refrigerator. Therefore, the supercooled state of foods and the like stored in the refrigerator is not canceled due to the temperature change caused by opening and closing the door of the refrigerator. Therefore, the refrigerator can maintain a supercooled state of stored food and the like, and can be operated so as not to freeze the food and the like.

1 is a front view showing refrigerator 1 according to Embodiment 1. FIG. 3 is a configuration diagram showing a chilled chamber 32 according to Embodiment 1. FIG. 2 is a functional block diagram showing a control section 7 according to Embodiment 1; FIG. 4 is a flow chart showing the operation of the control unit 7 according to Embodiment 1. FIG. 4 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to Embodiment 1. FIG. 4 is a flow chart showing the operation of the control unit 7 according to Embodiment 1. FIG. FIG. 11 is a functional block diagram showing a control unit 107 according to Embodiment 2; FIG. 9 is a flowchart showing the operation of the control unit 107 according to Embodiment 2; 9 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to Embodiment 2. FIG. FIG. 11 is a functional block diagram showing a control unit 207 according to Embodiment 3; 10 is a flow chart showing the operation of the control unit 207 according to Embodiment 3; 14 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to Embodiment 3. FIG. 10 is a flow chart showing the operation of the control unit 207 according to Embodiment 3;

Embodiment 1.
Refrigerator 1 according to Embodiment 1 will be described below with reference to the drawings. FIG. 1 is a front view showing refrigerator 1 according to Embodiment 1. FIG. FIG. 2 is a configuration diagram showing the chilled chamber 32 according to Embodiment 1. As shown in FIG. As shown in FIGS. 1 and 2, the refrigerator 1 has a heat-insulating box 2, a temperature adjustment section 3, a temperature detection section 4, an open door detection section 5, a storage section 6, and a control section .

(Heat insulation box 2)
The heat insulating box body 2 has a substantially rectangular parallelepiped box shape, and includes an outer box 11 forming an outer shell, an inner box 12 provided inside the outer box 11, and a space between the outer box 11 and the inner box 12. It consists of a heat insulating material 13. The outer box 11 is made of steel, for example. The inner box 12 is made of, for example, thin and hard ABS resin. The heat insulating material 13 is, for example, rigid urethane foam. The interior of the heat insulating box 2 is partitioned by a partition plate 15 into a storage space 17 , a cooling chamber (not shown), and an air passage 16 . The storage space 17 is partitioned into a plurality of storage chambers 22 by partition members 21 extending horizontally and vertically. The storage compartment 22 is a space in which objects to be cooled such as foodstuffs are stored, and consists of a refrigerating compartment 31 , a chilled compartment 32 , a switching compartment 33 , an ice making compartment 34 , a vegetable compartment 35 and a freezing compartment 36 . Furthermore, the front surface of the insulating box 2 is covered with a plurality of doors 14 that open and close the respective storage compartments 22 . The door 14 consists of a refrigerator compartment door 41 , a switching compartment door 43 , an ice making compartment door 44 , a vegetable compartment door 45 and a freezer compartment door 46 .

(Refrigerator compartment 31)
The refrigerator compartment 31 is formed at the top of the refrigerator 1 and cools and stores food and the like. The refrigerating compartment 31 is maintained in a refrigerating temperature range of about 3° C., for example, by the temperature control unit 3 . A food storage shelf 42 is installed horizontally in the refrigerator compartment 31 . Food and the like are placed on the food storage shelf 42 and refrigerated. A refrigerator compartment door 41 is positioned in front of the refrigerator compartment 31 . The refrigerator compartment door 41 is a double door that opens and closes the refrigerator compartment 31 . Further, the refrigerating compartment door 41 is provided with a setting operation section 51 for a user to perform operations such as temperature setting in the storage compartment 22 .

(Chilled room 32)
The chilled compartment 32 is formed as part of the refrigerator compartment 31 and is surrounded by a box-shaped food storage case 52 with an open top. The food storage case 52 is made of polystyrene, for example. The chilling chamber 32 is kept in a chilling temperature range of about 0° C., for example, by the temperature control unit 3 . The chilled temperature range may be -3°C to 3°C.

(Switching room 33)
The switching compartment 33 is formed below the refrigerator compartment 31 . The switching chamber 33 is kept in a temperature range selected from a freezing temperature range of about -18°C or a soft freezing temperature range of about -7°C by the temperature control unit 3, for example. The soft freezing temperature range may be -10°C to -4°C. A switching chamber door 43 is positioned in front of the switching chamber 33 . The switching chamber door 43 is a drawer type door that opens and closes the switching chamber 33 .

(Ice making chamber 34)
The ice making chamber 34 is formed on the side of the switching chamber 33 to manufacture and store ice. The ice making chamber 34 is maintained in a freezing temperature range of about -18°C, for example, by the temperature control unit 3 . An ice making chamber door 44 is positioned in front of the ice making chamber 34 . The ice making chamber door 44 is a drawer type door for opening and closing the ice making chamber 34 .
(Vegetable room 35)
The vegetable compartment 35 is formed below the switching compartment 33 and the ice making compartment 34 and mainly stores vegetables. The vegetable compartment 35 is maintained in a refrigerating temperature range of about 6° C., for example, by the temperature control section 3 . Moreover, the vegetable compartment 35 may be adjusted not only for temperature but also for humidity. A vegetable compartment door 45 is positioned in front of the vegetable compartment 35 . The vegetable compartment door 45 is a drawer type door that opens and closes the vegetable compartment 35 .

(Freezer compartment 36)
The freezer compartment 36 is formed below the vegetable compartment 35 and freezes and stores food and the like. The freezer compartment 36 is maintained in a freezer temperature range of about -18°C, for example, by the temperature controller 3 . A freezer compartment door 46 is positioned in front of the freezer compartment 36 . The freezer compartment door 46 is a drawer type door that opens and closes the freezer compartment 36 .

Note that the number and arrangement of the storage chambers 22 are not limited to the configuration described above.

(Cooling room, air passage 16)
The cooling chamber is formed behind the heat insulating box 2 and is a space in which a blower fan (not shown), a cooler (not shown), and the like of the temperature control unit 3, which will be described later, are arranged. The air passage 16 is formed behind the heat insulating box 2 and is a space through which cold air generated by the cooler and sent by the blower fan passes.

(Temperature adjustment unit 3)
The temperature adjuster 3 is a device that adjusts the temperature of the storage chamber 22 . The temperature control section 3 has a compressor (not shown), a condenser (not shown), an expansion section (not shown), a cooler (not shown), a blower fan (not shown), and a damper 61. . The compressor sucks in low-temperature, low-pressure refrigerant, compresses the sucked-in refrigerant, converts it into high-temperature, high-pressure refrigerant, and discharges it. A condenser exchanges heat between a high-temperature, high-pressure refrigerant and air. The expansion section is a pressure reducing valve or an expansion valve that reduces the pressure of the refrigerant to expand it. The cooler is provided upstream of the air passage 16 and serves as an evaporator to exchange heat between a low-temperature and low-pressure refrigerant and air, thereby cooling the air. The blower fan blows cold air generated by the cooler into the storage space 17 . The damper 61 controls the amount of cool air sent to the storage space 17 by adjusting the degree of opening.

Here, the operation of the temperature adjustment section 3 will be described. During operation of the refrigerator 1, the refrigerant sucked into the compressor is compressed by the compressor and discharged in a high-temperature and high-pressure gas state. The high-temperature, high-pressure gaseous refrigerant discharged from the compressor flows into the condenser. The refrigerant that has flowed into the condenser exchanges heat with the air, condenses, and liquefies. The liquid refrigerant flows into the expansion section, is decompressed and expanded, and becomes a low-temperature, low-pressure gas-liquid two-phase refrigerant. A gas-liquid two-phase refrigerant flows into a cooler that acts as an evaporator. The refrigerant that has flowed into the cooler exchanges heat with the air to evaporate and gasify. At this time, the inside of the heat insulation box 2 is cooled by the cooled air. The vaporized low temperature, low pressure gaseous refrigerant is then sucked into the compressor.

(Temperature detection unit 4, door open detection unit 5)
The temperature detection unit 4 is provided in each storage chamber 22 and detects the temperature of each storage chamber 22 . The temperature detection unit 4 is, for example, a thermistor. The door open detection unit 5 is provided for each door 14 and detects that each door 14 is opened.

(storage unit 6)
The storage unit 6 stores the number of door opening times, which is the number of times the door opening detecting unit 5 detects opening of the door 14, at predetermined time intervals. The predetermined time is, for example, one hour.

(control unit 7)
The controller 7 is provided inside the heat insulating box 2 . The control unit 7 sets a target temperature and controls the temperature adjustment unit 3 so that the temperature detected by the temperature detection unit 4 in the chilled room 32 reaches the target temperature. The control unit 7 controls, for example, the opening of the damper 61, the output of the compressor, the amount of air blown by the blower fan, and the like. Note that the control unit 7 may control the temperature adjustment unit 3 so that the temperature detected by the temperature detection unit 4 in the storage chambers 22 other than the chilled chamber 32 reaches the target temperature.

FIG. 3 is a functional block diagram showing the control section 7 according to Embodiment 1. As shown in FIG. As shown in FIG. 3 , the control unit 7 has storage means 71 , setting means 72 , determination means 73 , normal cooling means 74 and supercooling means 75 . The storage means 71, the setting means 72, the determination means 73, the normal cooling means 74, and the supercooling means 75 consist of algorithms.

(storage means 71)
The storage means 71 stores the number of times the door has been opened in the storage section 6 at predetermined time intervals. For example, the storage unit 71 is executed each time the open door detection unit 5 detects opening/closing of the door 14 .

(Setting means 72)
The setting means 72 sets a time zone in which the number of times the door is opened during each predetermined time period stored in the storage unit 6 is less than a threshold as a non-use time zone. The non-use time zone is a time zone indicating a time zone in which the frequency of opening and closing the door 14 is low. That is, it is assumed that the user is not active in the residence during the non-use time period, such as sleeping or going out. For the number of times the door is opened, for example, a value obtained by averaging the number of times the door is opened in the same time zone on each day of the most recent one week excluding the current day is used. That is, the setting means 72 updates the non-use time zone based on the number of door openings averaged over the most recent week including the number of door openings for the previous day, for example, when 24:00 has passed every day. The threshold is, for example, a predetermined number of times such as 0.3 times. Note that the non-use time period may be set in advance.

(Determination means 73)
The determination means 73 determines whether or not the time zone during which the control unit 7 is performing processing corresponds to the non-use time zone.

(Normal cooling means 74)
The normal cooling means 74 sets the target temperature to the normal temperature during the time period other than the non-use time period. The normal temperature is, for example, a predetermined temperature of about 0°C.

(supercooling means 75)
The supercooling means 75 sets the target temperature to the supercooling temperature so that the object to be cooled is below the freezing point during the non-use time period. A supercooling temperature is a temperature below the normal temperature, for example about -3°C. The setting of the supercooling temperature is continued for the supercooling time. The supercooling time is a time predetermined to be equal to or less than the length of the non-use time period.

FIG. 4 is a flow chart showing the operation of the control section 7 according to the first embodiment. FIG. 5 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to the first embodiment. The upper graph in FIG. 5 shows the transition of the average number of door openings over the most recent week excluding the current day. The graph in the middle shows the change in the number of detected door openings on the day. The lower graph shows changes in the temperature inside the chilled chamber 32 . A procedure for setting the non-use time period by the control unit 7 will be described with reference to FIG. 4 . First, the storage unit 71 stores the number of times the door has been opened in the storage unit 6 at predetermined time intervals (step S1). Next, the setting means 72 sets the non-use time zone (step S2). In Embodiment 1, as shown in FIG. 5, the non-use time zone is set from 18:00 to 24:00.

FIG. 6 is a flow chart showing the operation of the control section 7 according to the first embodiment. A procedure for cooling the chilled chamber 32 by the control unit 7 will be described with reference to FIG. First, the determination means 73 determines whether or not the time period during which the processing is being performed corresponds to the non-use time period (step S5). If it is not the non-use time zone (NO in step S5), the normal cooling means 74 sets the target temperature to the normal temperature (step S6). If it is the non-use time zone (YES in step S5), the supercooling means 75 sets the target temperature to the supercooling temperature (step S7). At this time, as shown in the lower part of FIG. 5, the temperature inside the chilled chamber 32 drops to the supercooling temperature during the non-use time period. Then, after the supercooling time has elapsed, the normal cooling means 74 sets the target temperature to the normal temperature (step S6). The control unit 7 repeatedly executes such a procedure at regular intervals.

According to Embodiment 1, the refrigerator 1 cools objects to be cooled, such as foods, to a temperature below the freezing point during non-use hours. During non-use hours, the user has few opportunities to use the refrigerator 1 . For this reason, food stored in the refrigerator 1 is not released from the supercooled state due to the temperature change caused by opening and closing the door 14 of the refrigerator 1 . Therefore, the refrigerator 1 can maintain the supercooled state of the stored food, etc., and can operate so as to prevent the food, etc. from freezing.

Further, according to Embodiment 1, the control unit 7 uses the open door detection unit 5 to set the non-use time zone. For this reason, the control unit 7 sets the non-use time zone according to the usage status of the refrigerator 1 based on the user's actual life. That is, the door 14 of the refrigerator 1 is less likely to be opened and closed during non-use hours. Therefore, the refrigerator 1 maintains the supercooled state of the stored food, etc., and can more reliably operate so that the food, etc. does not freeze.

Embodiment 2.
FIG. 7 is a functional block diagram showing control section 107 according to the second embodiment. As shown in FIG. 7, the second embodiment differs from the first embodiment in that the control unit 107 further has a temperature raising means 176. FIG. In the second embodiment, the same reference numerals are assigned to the same parts as in the first embodiment, and the description thereof is omitted.

(control unit 107)
In refrigerator 101 , control unit 107 further has temperature increasing means 176 . The temperature raising means 176 consists of an algorithm.

(Temperature raising means 176)
The temperature raising means 176 sets the target temperature to the raised temperature during the non-use time period. The elevated temperature is a temperature above normal temperature, for example, 2°C. The setting of the temperature rise is continued for the temperature rise time after the supercooling time has elapsed. The temperature rise time is a time predetermined to be equal to or less than the length of the non-use time period.

FIG. 8 is a flow chart showing the operation of the control unit 107 according to the second embodiment. FIG. 9 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to the second embodiment. The upper and lower graphs in FIG. 9 correspond to the respective upper and lower graphs in FIG. A procedure for cooling the chilled chamber 32 by the control unit 107 will be described with reference to FIG. First, the determination means 73 determines whether or not the time period during which the processing is being performed corresponds to the non-use time period (step S15). If it is not the non-use time zone (NO in step S15), the normal cooling means 74 sets the target temperature to the normal temperature (step S16).

If it is the non-use time zone (YES in step S15), the supercooling means 75 sets the target temperature to the supercooling temperature (step S17). At this time, as shown in the lower part of FIG. 9, the temperature inside the chilled chamber 32 drops to the supercooling temperature during the non-use time period. After the supercooling time has elapsed, the temperature raising means 176 sets the target temperature to the temperature to be raised (step S18). At this time, as shown in the lower part of FIG. 9, the temperature inside the chilled chamber 32 rises to the elevated temperature during the non-use time period. Furthermore, after the elapse of the temperature raising time, the normal cooling means 74 sets the target temperature to the normal temperature (step S16). The control unit 107 repeatedly executes such a procedure at regular intervals.

According to Embodiment 2, control unit 107 has temperature increasing means 176 . For this reason, the refrigerator 101 raises the temperature of food and the like before the end of the non-use time period. In other words, the food and the like stored in the refrigerator 101 are not frozen or have a low freezing rate outside the non-use time period. Therefore, the refrigerator 101 can further eliminate the trouble of defrosting food and the like.

Embodiment 3.
FIG. 10 is a functional block diagram showing control section 207 according to the third embodiment. As shown in FIG. 10, the third embodiment differs from the second embodiment in that the control unit 207 further includes special setting means 277, special determination means 278, special supercooling means 279, and special temperature raising means 280. differ from In the third embodiment, the same reference numerals are given to the same parts as in the second embodiment, and the description thereof is omitted, and the differences from the second embodiment are mainly described.

(control unit 207)
In refrigerator 201 , control unit 207 further includes special setting means 277 , special determination means 278 , special supercooling means 279 and special temperature raising means 280 . The special setting means 277, the special determination means 278, the special supercooling means 279 and the special heating means 280 consist of algorithms.

(Special setting means 277)
The special setting means 277 sets, as a special control day, a day having a time zone in which the number of door openings stored in the storage unit 6 is within a predetermined special threshold range other than the non-use time zone. A special control day indicates a day on which a special temperature is set as the target temperature. The special control day is assumed to be a holiday or the like. The special threshold range is, for example, a predetermined number of times, such as 0.5 times or less. The special setting means 277 is executed every predetermined time. Note that the special setting unit 277 may be executed each time the open door detection unit 5 detects opening and closing of the door 14 . Moreover, the special control date may be set in advance.

(Special judgment means 278)
The special determination unit 278 determines whether or not the day on which the control unit 207 is performing processing corresponds to the special control day. The special determination unit 278 is executed when the determination unit 73 determines that the time period during which the control unit 207 is performing processing corresponds to the non-use time period. Note that the special determination means 278 may be executed after the special setting means 277 at predetermined time intervals.

(Special supercooling means 279)
The special supercooling means 279 sets the target temperature to the special supercooling temperature so that the object to be cooled is below the freezing point during the non-use time period of the special control day. The special supercooling temperature is a temperature above the supercooling temperature and below the normal temperature. The setting of the special supercooling temperature is continued for the special supercooling time. The special supercooling time is a time predetermined to be equal to or less than the length of the non-use time period.

(Special heating means 280)
The special heating means 280 sets the target temperature to the special heating temperature during the non-use time zone of the special control day. The special elevated temperature is a temperature above the normal temperature and below the elevated temperature. The setting of the special heating temperature is continued for the special heating time after the special supercooling time has passed. The special heating time is a time that is predetermined to be equal to or less than the length of the non-use time period.

FIG. 11 is a flow chart showing the operation of the control unit 207 according to the third embodiment. FIG. 12 is a graph showing the number of times the door is opened and the temperature of the storage chamber 22 according to the third embodiment. The upper and lower graphs in FIG. 12 correspond to the upper and lower graphs in FIGS. 5 and 9, respectively. A procedure for the control unit 207 to set the non-use time zone and the special control day will be described with reference to FIG. 11 . First, the storage unit 71 stores the number of times the door has been opened in the storage unit 6 at predetermined time intervals (step S21). Next, the special setting means 277 sets a special control date (step S22). As shown in the middle part of FIG. 12, the day is set as a special control day because the number of door openings is 0 in any time period. Finally, the setting means 72 sets the non-use time zone (step S23). At this time, as shown in FIG. 12, the period from 18:00 to 24:00 is set as the non-use time zone.

FIG. 13 is a flow chart showing the operation of the control unit 207 according to the third embodiment. A procedure for cooling the chilled chamber 32 by the control unit 207 will be described with reference to FIG. 13 . First, the determination means 73 determines whether or not the time period during which the processing is being performed corresponds to the non-use time period (step S15). If it is not the non-use time zone (NO in step S25), the normal cooling means 74 sets the target temperature to the normal temperature (step S26).

If it is the non-use time zone (YES in step S25), the special determination means 278 determines whether the current day is a special control day (step S27). If it is not the special control day (NO in step S27), the supercooling means 75 sets the target temperature to the supercooling temperature (step S28). As a result, as shown in FIG. 12, the temperature inside the chilled chamber 32 drops to the supercooled temperature during the non-use time period. After the supercooling time has elapsed, the temperature raising means 176 sets the target temperature to the temperature to be raised (step S29). As a result, as shown in FIG. 12, the temperature inside the chilled chamber 32 rises to the elevated temperature during the non-use time period. Furthermore, after the elapse of the temperature raising time, the normal cooling means 74 sets the target temperature to the normal temperature (step S26).

If it is a special control day (YES in step S27), the special supercooling means 279 sets the target temperature to the special supercooling temperature (step S30). As a result, as shown in the lower part of FIG. 12, the temperature inside the chilled chamber 32 is lowered to the special supercooling temperature during the non-use time period. After the special supercooling time elapses, the special heating means 280 sets the target temperature to the special heating temperature (step S31). As a result, as shown in the lower part of FIG. 12, the temperature inside the chilled chamber 32 rises to the special elevated temperature during the non-use time period. Furthermore, after the elapse of the special temperature rising time, the normal cooling means 74 sets the target temperature to the normal temperature (step S26). The control unit 207 repeatedly executes such a procedure at regular intervals.

According to Embodiment 3, the control unit 207 has a special supercooling means 279 that sets the target temperature to a special supercooling temperature exceeding the supercooling temperature. In general, on special control days such as holidays, the door 14 is more likely to be opened and closed during non-use hours than on normal days. Here, the lower the temperature of the supercooled food or the like, the easier it is to release the supercooled state when the door 14 is opened and closed. In the third embodiment, as described above, the target temperature is set to the special supercooling temperature exceeding the supercooling temperature. Therefore, food stored in refrigerator 201 is less likely to freeze even when door 14 is opened and closed. Therefore, the refrigerator 201 maintains the supercooled state of the stored food, etc., and can more reliably operate so that the food, etc. does not freeze.

Further, according to Embodiment 3, the control unit 207 has the special temperature increasing means 280 that sets the target temperature to a special temperature increase that is less than the temperature increase. In general, on special control days such as holidays, the door 14 is more likely to be opened and closed during non-use hours than on normal days. Also, if the door 14 is opened and closed while the temperature in the storage chamber 22 is high, the temperature of the food or the like will rise significantly, and the storage quality may deteriorate. Here, in the third embodiment, as described above, the target temperature is set to the special elevated temperature which is lower than the elevated temperature. Therefore, even when the door 14 is opened and closed, the refrigerator 201 can suppress the temperature rise of stored food and the like, and can maintain storage quality.

Note that the control unit 7, the control unit 107 and the control unit 207 are dedicated hardware or a CPU (Central Processing Unit, central processing unit, processing unit, arithmetic unit, microprocessor, Also called a microcomputer or processor). Control unit 7, control unit 107 and control unit 207
is dedicated hardware, the control unit 7, the control unit 107 and the control unit 207 are, for example, a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or A combination of these is applicable. Each of the functional units implemented by the control unit 7, the control unit 107, and the control unit 207 may be implemented by individual hardware, or each functional unit may be implemented by one piece of hardware.

When the control unit 7, the control unit 107, and the control unit 207 are CPUs, each function executed by the control unit 7, the control unit 107, and the control unit 207 is realized by software, firmware, or a combination of software and firmware. Software and firmware are written as programs and stored in the storage unit 6 . The CPU implements each function by reading and executing a program stored in the storage unit 6 . Here, the storage unit 6 is, for example, a non-volatile or volatile semiconductor memory such as RAM, ROM, flash memory, EPROM, EEPROM. A part of the functions of the control unit 7, the control unit 107, and the control unit 207 may be realized by dedicated hardware, and a part thereof may be realized by software or firmware.

REFERENCE SIGNS LIST 1 refrigerator 2 heat insulation box 3 temperature control unit 4 temperature detection unit 5 open door detection unit 6 storage unit 7 control unit 11 outer case 12 inner case 13 heat insulating material 14 door 15 partition plate , 16 air passage, 17 storage space, 21 partition member, 22 storage room, 31 refrigerating room, 32 chilled room, 33 switching room, 34 ice making room, 35 vegetable room, 36 freezing room, 41 refrigerating room door, 42 food storage shelf , 43 switching compartment door, 44 ice making compartment door, 45 vegetable compartment door, 46 freezer compartment door, 51 setting operation section, 52 food storage case, 61 damper, 71 storage means, 72 setting means, 73 determination means, 74 normal cooling means , 75 supercooling means, 101 refrigerator, 107 control section, 176 temperature raising means, 201 refrigerator, 207 control section, 277 special setting means, 278 special determination means, 279 special supercooling means, 280 special temperature raising means.

Claims (5)

a box-shaped heat-insulating box having a storage chamber in which an object to be cooled is stored and a front surface covered with a door;
a temperature adjustment unit provided in the heat insulating box for adjusting the temperature of the storage chamber;
a control unit provided in the heat insulating box for controlling the temperature adjustment unit;
A door open detection unit provided in the heat insulation box and detecting the number of times the door is opened, which is the number of times the door is opened,
The control unit
In a non-use time zone indicating a time zone in which the frequency of opening and closing the door is low, the temperature adjustment unit adjusts the temperature of the storage chamber so that the temperature of the object to be cooled is below the freezing point. The target temperature, which is the temperature that Set as a non-use time zone, and days other than the non-use time zone, days with a time zone in which the number of times the door is opened are within a predetermined special threshold range are days when a special temperature is set as the target temperature A special control date and setting indicating the refrigerator. The control unit
The target temperature is set to a special supercooling temperature that is above the supercooling temperature and below the normal temperature so that the object to be cooled is below the freezing point during the non-use time zone of the special control day. Refrigerator according to claim 1. The control unit
3. The refrigerator according to claim 1 or 2, wherein in the non-use time period, after setting the target temperature to the supercooling temperature, the target temperature is set to an elevated temperature that exceeds the normal temperature. The control unit
4. The refrigerator according to claim 3, wherein the target temperature is set to a special elevated temperature that is higher than the normal temperature and lower than the elevated temperature in the non-use time zone of the special control day. a box-shaped heat-insulating box having a storage chamber in which an object to be cooled is stored and a front surface covered with a door;
a temperature adjustment unit provided in the heat insulating box for adjusting the temperature of the storage chamber;
A control unit provided in the heat insulating box and controlling the temperature adjustment unit,
The control unit
In a non-use time zone indicating a time zone in which the frequency of opening and closing the door is low, the temperature adjustment unit adjusts the temperature of the storage chamber so that the temperature of the object to be cooled is below the freezing point. Set the target temperature, which is the temperature at which the A target temperature is set to an elevated temperature that exceeds the normal temperature , and when the non-use time period ends, the target temperature is set from the elevated temperature to the normal temperature.
refrigerator.

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