JP2001004260A - Overcooling-controlling refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the evaporation of vegetable, etc., by operating a refrigerator, setting the temperature within a refrigerator to not less than the freezing point of stored goods to be kept cool and, for the food material containing water, in the cold storage temperature range of 0 deg.C or over, at normality on one hand, and operating it in the overcooling temperature band of the freezing point temperature or under of the goods to be kept cool for a specified time at the time of overcooling operation on the other. SOLUTION: This refrigerator is provided with temperature detecting mechanisms 79 and 81, respectively, within a refrigerator 23 and a freezer 25, and the number of revolutions of a capacity-variable compressor 69 is set, according to one temperature range within the refrigerator 23 and the freezer 25, in line with the output and the set temperature. Moreover, the temperature within the refrigerator 23 and the freezer 25 is adjusted by controlling the number of revolutions of each chill circulating fan 35 and 55, according to the output of each in-storage temperature detecting mechanism 79 and 81. That is, at normality, it is operated in a cold storage temperature range of not less than the freezing point of the goods to be kept cool, and, for the food containing water, not less than 0 deg.C, concerning the set temperature within the refrigerator 23, on one hand, and at overcooling operation, it is operated in a overcooling temperature range of not more than the freezing point of the goods to be kept cool for a specified time, thereby enabling the goods to be kept cool enough to be stored for a long period in fresh condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for temporarily keeping a temperature in a refrigerator for keeping and storing fresh foods in a supercooled state below a freezing point to promote long-term storage of foods and taste of the foods. The present invention relates to a target supercooling control refrigerator.

[0002]

2. Description of the Related Art In recent years, fresh foods such as fruits and vegetables, meat and seafood,
Alternatively, in order to store refrigerated processed foods such as tofu, ham and kamaboko, storage conditions at a temperature as low as possible without freezing and at a humidity as high as possible without dew condensation are preferred.
High humidity technology and temperature equalization technology have been developed. As a typical operation method, there is a method using wall cooling. Wall cooling is -3 ° C to 3 ° C.
By cooling to around ℃, increasing the airtightness in the refrigerator by attaching the door, the refrigerator is uniformly cooled in the range of 0 to 5 ° C, and the moisture that enters by opening and closing the door is captured to increase the humidity. It is. 4 or 5 without cold air leakage or ingress
It is natural cooling from the wall of the surface, it can cool the inside of the refrigerator uniformly and reliably, even if the temperature in the refrigerator is cooled down to 0 ° C, there is little unevenness in the temperature in the refrigerator, and partial freezing Few.

However, in order to cool uniformly, the capacity in the refrigerator is limited, and as the volume in the refrigerator increases, the ratio of the cooling area decreases, and the distance between the wall surface to be cooled and the insulated product increases. Therefore, it takes time for the food placed in the center of the refrigerator to become uniform, and the cooling speed is very slow. In other words, there is little problem in keeping things that are already cold or keeping them for a long period of time, but the doors are frequently opened and closed like household refrigerators, and food and soft drinks and other ingredients placed at room temperature It takes time to put beer and the like in and out, and cool those cool products from room temperature to an appropriate temperature, which significantly lowers the commercial value.

In order to increase the cooling rate in the refrigerator, a refrigeration cycle in which the refrigerant passes through the compressor, the condenser, the throttle valve, and the evaporator and returns to the compressor again, and a cool air cooled by the evaporator is cooled by a cool air circulation fan. It is preferable to use an indirect cooling method in which the inside of the refrigerator is cooled by a cooling mechanism that discharges the inside of the refrigerator.

However, in this method, in order to blow cold air at a temperature lower than the set temperature in the refrigerator, the cool air circulating fan and the compressor are linked with the temperature detector in the refrigerator to adjust the temperature in the refrigerator. Need to be intermittent operation. That is, as shown in the graph of the change in the refrigerator set temperature and the product temperature in FIG. 6, the product temperature curve repeats up and down fluctuations.

[0006] Further, cooling air is not circulated in the stagnant portion in the refrigerator and cooling is insufficient, and there are places where the area near the outlet of the cold air is supercooled in a spot. As a result, large temperature unevenness occurs in the refrigerator. In consideration of the temperature unevenness, it is necessary to increase the entire set temperature so that the food does not freeze in a place where the temperature is low or in a temperature fluctuation. In particular, when fresh foods such as vegetables and fruits freeze, the water in the cells freezes, and the cells are destroyed by expansion due to freezing.
Therefore, it was necessary to store fresh food at a temperature considerably higher than the optimum storage condition in a refrigerator, and it was very difficult to maintain freshness.

[0007] In order to equalize the temperature by the indirect cooling method, there is a method in which the opening and closing of the damper is reduced and the amount of cool air flowing in is reduced. However, if the capacity of the refrigerator is small, the temperature can be considerably equalized. As described above, when the capacity is increased, the temperature unevenness is still increased.

Further, in such a cooling method, since the moisture passes through a very low evaporator surface, the moisture is dehumidified on the evaporator surface, and the blown-out cold air has a low relative humidity, thereby accelerating the drying of the food as a heat insulating material. become.

As a solution to the above problem, Japanese Patent Laid-Open No.
Japanese Patent No. 318645 discloses a refrigerator having a refrigerator compartment and a vegetable compartment, and a freezer having different temperature zones. The number of rotations of a cool air circulation fan and a variable capacity compressor is set in accordance with each cooling temperature. The temperature of the fan can be adjusted according to the output of the temperature sensor, which is the temperature detection mechanism inside the refrigerator, and the temperature can be adjusted for each target temperature room. The air volume can be adjusted to eliminate a large temperature difference between the incoming cold air temperature.

Further, in recent home refrigerators, a refrigeration evaporator and a refrigeration evaporator are connected in parallel, the evaporating temperature in the refrigeration evaporator is increased, and the surface temperature of the evaporator is set high to improve the dehumidifying effect. When the compressor is stopped, a mechanism for humidifying the inside of the refrigerator by operating only the cool air circulation fan to remove frost from the evaporator inside the refrigerator is mounted.

In Japanese Patent Application Laid-Open No. Hei 8-247608, the cool air cooled by the cooler passes through the cool air guide passage and is supplied into the refrigerator, but the cool air outlet is provided with a rotating cool air discharge member to provide the cool air. Are dispersed to the left and right to cool the refrigerator uniformly.

Further, Japanese Patent Application Laid-Open No. Hei 7-115952 discloses a method of applying stress to a living body to improve umami. In other words, subjecting living organisms that are breathing such as vegetables, fruits, cereals, live fish, and shellfish to stress treatment by drying, adding water, pressure, light rays, snow, sound waves, etc. under a low temperature zone of 0 ° C or less. According to the secretion of various flavor-related components in the living body, immature ones are completely ripe, those that are not originally seasonal can be seasonally tasted, and it is further described that the taste can be further improved. Natural phenomena that prove their effect include an increase in the sweetness of Chinese cabbage when frost falls.

[0013]

However, as disclosed in Japanese Patent Application Laid-Open No. Hei 10-318645, a cooling air circulation fan corresponding to each cooling temperature is provided, and the number of revolutions is set by a variable capacity compressor in accordance with the refrigeration temperature zone. Where the number of rotations of each cooling air circulation fan is varied in accordance with the output of the temperature sensor to achieve a desired temperature adjustment.
As described in Japanese Patent Application Laid-Open No. Hei 7-115952, even when the refrigerator is uniformly cooled by dispersing cool air to the left and right by a rotating cool air discharge member of a cool air discharge port as disclosed in Japanese Patent Application Laid-Open No. 6-115952. It cannot be preserved, and if the temperature in the refrigerator is lowered, the freezing of the food proceeds in a part of the refrigerator, the cells are destroyed, and the taste of the food decreases.

[0014] Even if a stress treatment such as drying, adding water, pressure, light rays, snow and sound waves is applied under a low temperature range of 0 ° C or less, it is impossible to keep the temperature in a home refrigerator for a long time. In some cases, when ice nuclei are formed by some kind of stimulus, freezing is started at once and cells of fresh food are destroyed.

An object of the present invention is to provide a supercooling control refrigerator capable of extracting the flavor of the above fresh food, promoting ripening, and suppressing evaporation of vegetables and the like.

[0016]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an insulating box having an openable and closable door, cooling means for cooling the inside of the insulating box, and the insulating box. Temperature detecting means for detecting the temperature in the refrigerator, and control means for interlocking the cooling means and the temperature detecting means and controlling the inside of the refrigerator to a predetermined temperature set value. The temperature set value inside is above the freezing point of the insulated product to be stored, and is operated in the refrigeration temperature zone of 0 ° C or more for foods containing water, and during the supercooling operation, for a predetermined time, below the freezing point of the insulated product. Operate in the subcooling temperature zone that is the temperature set value,
It stores insulated products.

The supercooling operation is started by detecting the time when the open door is closed by the detecting means, or after the operation in the supercooling temperature zone is completed, the temperature is set based on a temperature set value in a normal refrigeration operation. The time when the operation and the stop of the cooling means are repeated one or more times is set as the start timing of the supercooling operation.

Further, when a filter paper containing two sheets of water is placed on a glass plate, and the value of a thermometer sandwiched between the two filter papers is defined as the surface temperature of the cold storage product, the temperature of the cold storage product in the refrigerated temperature zone is determined. The predetermined operation time in the supercooling temperature zone is set to be shorter than 80 times the unit time with respect to the unit time required for decreasing the surface temperature by 1K.

A refrigeration cycle in which the refrigerant passes through the compressor, the condenser, the throttle valve, and the evaporator and returns to the compressor again, and a multi-cycle for uniformly circulating the cool air cooled by the evaporator in the refrigerator in the heat insulating box. It is characterized by a cooling means constituted by a duct and a cool air circulation fan.

The cooling air circulation fan is of a variable capacity type,
It is characterized by rotation number control means for controlling the rotation number of the cool air circulation fan by temperature detection means.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a heat insulating box having an openable and closable door according to a first embodiment of the present invention; Temperature detecting means for detecting, and control means for interlocking the cooling means and the temperature detecting means and controlling the inside of the refrigerator to a predetermined temperature set value, and the temperature set value of the insulated box in the refrigerator at normal times is Operate in the refrigerated temperature range above the freezing point of the stored cool product, and in the supercooling operation, operate for a predetermined time in the supercool temperature range that is the temperature set value below the freezing point of the cool product to store the cool product. It is characterized by the fact that the insulated product temporarily goes below the freezing point, but does not immediately proceed to freezing and becomes a supercooled state. Do not complete freezing. In addition, the fresh food in the supercooled state has the effect as described in JP-A-7-115952, brings out the taste of the fresh food, and promotes ripening. Furthermore, in vegetables and the like, the pores shrink and the effect of reducing the evaporation of water is obtained.

According to a second aspect of the present invention, when the insulated product is a food such as fruits and vegetables, fresh vegetables, cereals, nuts, fish and shellfish, meat, and paste, the freezing point is a freezing point of water. 0 ° C
By setting the temperature at 0 ° C., it is possible to obtain a supercooling control refrigerator capable of handling all foods regardless of the moisture content in the foods.

According to a third aspect of the present invention, a new cooling product is provided by detecting a time when an open door is closed by a detecting means and starting a supercooling operation, thereby immediately lowering the inside of the refrigerator raised by opening and closing the door. Is a supercooling operation, whereby the effect of maintaining the freshness of the insulated product and the aging effect are imparted more quickly.

According to a fourth aspect of the present invention, after the operation in the supercooling temperature zone is completed, the supercooling is performed when the operation and the stop of the cooling means according to the temperature set value in the normal refrigeration operation are repeated once or more. Even if foods that have advanced freezing have appeared at the start of operation, they can be freed from the effects of supercooling operation by performing at least one cycle of normal refrigeration operation to prevent freezing. It is.

According to a fifth aspect of the present invention, when a filter paper containing two pieces of water is placed on a glass plate, and the value of a thermometer sandwiched between the two pieces of filter paper is taken as the surface temperature of the cooled product, the refrigeration temperature By making the predetermined operation time in the supercooling temperature zone shorter than 80 times the unit time for the unit time required for the surface temperature of the insulated article to drop by 1 K in the zone, the heat quantity of the heat of solidification can be reduced. By stopping the supercooling operation before consumption, destruction in cells can be prevented.

According to a sixth aspect of the present invention, there is provided a refrigeration cycle in which a refrigerant passes through a compressor, a condenser, a throttle valve, and an evaporator and returns to a compressor again, and cool air cooled by the evaporator is supplied to a refrigerator in an insulated box body. The cooling means is composed of a multi-duct that circulates the air uniformly and a cooling air circulation fan to keep the temperature of the discharged cold air as close as possible to the internal temperature of the refrigerator and to equalize the temperature in the refrigerator regardless of the storage volume. Thus, supercooling can be reliably performed.

According to a seventh aspect of the present invention, the cooling air circulating fan is of a variable capacity type and has a rotation speed control circuit for controlling the rotation speed of the cooling air circulating fan by means of a temperature detecting means. It is intended to prevent drying and promote ripening by setting the supercooled state as soon as possible.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a sectional view showing the internal structure of a subcooling control refrigerator according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a heat insulating box of the refrigerator 3, which has a structure in which a heat insulating material is provided inside the exterior panel 5. Inside the heat-insulating box 1, the refrigerator compartment 9,
The vegetable compartment 11, the first freezer compartment 13, and the second freezer compartment 15 are configured in multiple stages, and the refrigerator compartment 9, the vegetable compartment 11, the first freezer compartment 13,
The second freezer compartment 15 has doors 17, 18, 19,
20 is provided, and the insulated doors 17, 18, 19, and 20 can be opened and closed to allow the insulated goods 21 such as foods to be taken in and out.

The vegetable compartment 11 and the first freezer compartment 13 are vertically divided by a heat insulating wall 22 into a refrigerator interior 23 and a freezer interior 25 having different set temperatures.

The refrigerator compartment 23 is composed of a refrigerator compartment 9 and a vegetable compartment 11, and the refrigerator compartment 9 and the vegetable compartment 11 are vertically divided by a partition plate 27 so that cool air circulates. Since the partition plate 27 circulates cold air at the same temperature, no heat insulating material is required, and the detachable shelf 2 provided in the refrigerator compartment 9 is provided.
9 and the storage container 31 are formed to be thin with the same member, and are set so that the occupied space is small.

In the first evaporator 33, the cold air that has undergone heat exchange is sent forward by the first variable capacity cool air circulating fan 35 on the opening and closing door 17 side, and then flows through the refrigerator compartment 9 and the vegetable compartment 11 with arrows. It is set such that an appropriate temperature in the refrigerator can be obtained by repeating the circulation that flows back from the cold air flow path 41 to the first evaporator 33 again. The cool air flow path 41 is formed by cutting out a part of the rear surface of the shelf, and providing an opening 43 that passes from the refrigerator 9 to the vegetable compartment 11 on the front side.

The interior 25 of the refrigerator is composed of a first freezer compartment 13 and a second freezer compartment 15 and is vertically partitioned by a partition plate 49 so as to circulate cool air. Since the partition plate 49 circulates cold air at the same temperature, no heat insulating material is required.
It is formed thin by the same member as the storage container 51 provided in the storage. One of the cool air exchanged in the second evaporator 53 is cooled by the second variable capacity cool air circulation fan 55 from the cool air passage 61 of the partition plate 49 to the first freezing chamber 13.
The other is discharged into the second freezer compartment 15 from between the corner wall 63 and the partition plate 49. The cool air that has passed through the first freezer compartment 13 merges in the second freezer compartment 15 through a communication hole 65 formed in front of the partition plate 49 that passes to the second freezer compartment 15, and the second freezer compartment 15 storage containers 51 and refrigerator bottom wall 66
The temperature is set so that a freezer temperature of −15 ° C. or less is obtained by repeating the circulation returning to the second evaporator 53 through the gap between the freezer and the second evaporator 53.

A machine chamber 67 provided at the lowermost part of the heat insulating box 1 is provided with a variable capacity compressor 69, a condenser 71, a three-way valve 72, a first throttle valve 73, and a second throttle valve. 74, and the first evaporator 33, the first
The variable capacity cool air circulation fan 35, the second evaporator 53, and the second variable capacity cool air circulation fan 55 constitute a cooling mechanism 77 (cooling means) composed of a refrigeration cycle shown in FIG.

That is, in the refrigeration cycle shown in FIG.
The first evaporator 33 and the second evaporator 53 are connected in parallel, and the refrigerant discharged from the compressor 69 can be switched in two directions by the condenser 71 and the three-way valve 72. Constitutes a refrigeration cycle 78 passing through the first throttle valve 73 to the first evaporator 33 and the other passing through the second throttle valve 74 to the second evaporator 53 and returning to the compressor 69 again. are doing.

In the refrigerator configured as described above, the variable capacity compressor 69 is provided in the refrigerator 23 constituting each temperature zone space with the temperature detecting mechanism 7 in the refrigerator 23.
9 (temperature detecting means) is provided, and a temperature detecting mechanism 81 of the freezer 25 is provided in the freezer 25, and one of the temperature zones of the refrigerator 23 and the freezer 25 is provided in accordance with the output and the set temperature. And the first and second variable capacity cooling air circulation fans 35, 55
By variably controlling the number of rotations according to the outputs of the internal temperature detection mechanisms 79 and 81, the temperature in the refrigerator 23 and the temperature in the freezer 25 can be adjusted.

The temperature of the refrigerator 23 is set by the control device 83 of the exterior panel of the heat insulating box 1.
It is possible to set two temperatures, a refrigeration temperature value and a supercooling temperature value, which are bounded by the freezing temperature of the food.

The specific values used in the first embodiment are as follows: the first freezer compartment 13 and the second freezer compartment 15 have a freezing temperature of -18.
The temperature in the refrigerator 23 of the refrigerator compartment 9 and the vegetable compartment 11 is set to 3 ° C. and the supercooling temperature value is set to −20 ° C.
It is set at 5 ° C. In the freezer 25, the second evaporator 5 is driven by the second variable capacity cool air circulation fan 55.
3 is supplied to the first freezer compartment 13 and the second freezer compartment 15 as described above, and the rotation speed of the second cool air circulation fan 55 is adjusted so that the blown air temperature at this time becomes −24 ° C. Control.

The temperature of the refrigerator 23 is controlled by linking the temperature detecting mechanism 79 and the cooling mechanism 77 with a control device 83 (control means). That is, the inside of the refrigerator 23 is initially maintained at 3 ° C.
7 or the opening and closing of the door 18 of the vegetable compartment is detected by a detecting means (not shown), whereby the set temperature of the refrigerator 23 in the control device 83 is switched to -5 ° C, and the supercooling operation is started. The supercooling setting operation is detected to reach −5 ° C., and is completed when about 10 minutes have elapsed by the timer 85 in the control device 83, and the normal cooling operation at 3 ° C. is switched again. Further, the counter 87 in the controller 83, which starts the time of switching to the refrigeration operation and counts the number of notches based on 3 ° C. in the refrigerator, waits for -5 ° C. again after the count has elapsed twice. It is set so that the cooling operation is started. Therefore, normal operation of 3 ° C. is resumed after 10 minutes. That is, when the timing of opening or closing of the door or the count number of the notch indicates two times, the above operation is repeated.

The temperature of the first evaporator 33 is directly connected to the second throttle valve 73 and the evaporator 53 shown in FIG.
The evaporation temperature can be freely set by the throttle valve 73, and in the present embodiment, the temperature is set to −10 ° C. Therefore, the rotation speed of the first variable capacity cool air circulation fan 35 is controlled so that the cool air ejection temperature becomes about -5 ° C. When the temperature inside the refrigerator changes due to a change in the outside air temperature or opening and closing of the door, the rotation speed of the variable capacity compressor 69 is controlled according to the temperature inside the refrigerator. The maximum air volume was set to 35.

When the temperature of the second evaporator 53 changes, the temperature of the first evaporator 33 also changes. However, the first cool air circulation fan 35 changes the temperature of the cold air blown into the refrigerator compartment 9 to the set temperature. , The temperature of the refrigerator 23 can be maintained. Even if the compressor stops, the first cool air circulation fan 35 continues to rotate until a predetermined time comes,
The inside of the refrigerator 23 is humidified by the frost on the surface of the first evaporator 33.

The operation of the first embodiment of the present invention at the time of switching between the normal operation of the refrigerator and the supercooling setting operation will be described with reference to a flowchart mainly showing temperature control in the refrigerator shown in FIG.

Power is supplied to the refrigerator 3, and the variable capacity compressor 69 and the first and second variable capacity cool air circulation fans 35 operate (step 320). Then, it is checked whether the temperature in the refrigerator is 3 ° C. or more (step 33).
0) If it is 3 ° C. or higher, the process returns to step 320 and the same operation is repeated. If the temperature is not higher than 3 ° C., the compressor 69 is turned off (step 350). At this time, the circulation fan 35 is kept ON for a predetermined time to melt the frost on the first evaporator 33 and humidify the inside of the refrigerator 23.

Next, the inside temperature of the refrigerator 23 is checked again (step 360). If the temperature is higher than 3 ° C., the count of the counter 87 is counted once. Return to step 320 and set the compressor to O
N. If the refrigerator temperature is equal to or lower than 3 ° C. in step 360, the stopped state of the compressor 69 is continued. Steps 320 to 360 are repeated to count 2
When the above is reached, the operation enters the supercooling operation (step 380).
That is, the compressor 69 and the cool air circulation fan are operated at the maximum capacity (step 390), and the temperature in the refrigerator is cooled to -5C.

In step 400, the temperature in the refrigerator is set to -5.
If the temperature is equal to or higher than the temperature, the compressor 69 and the circulation fan 35 are kept operating. If the temperature is equal to or lower than -5 ° C, a timer check (step 410) is started. That is, the elapsed time of the timer measuring the time from the start of the supercooling operation is checked. If the time is within 10 minutes, the operation is continued until the time reaches 10 minutes. The same operation is repeated.

When a door open / close signal is received, the supercooling operation is forcibly started.

The reason for setting the timer to 10 minutes is that in this embodiment, two wet filter papers are placed on a glass plate as a simulated load in the refrigerator 23, and a thermometer sandwiched between the two filter papers is used. Is the surface temperature of the refrigerated product, the unit time required for the surface temperature of the refrigerated product to drop by 1 K in the refrigerated temperature zone was 30 seconds, which was calculated based on the experimental result. By setting the predetermined operating time in the above to be shorter than 80 times the unit time, freezing of the food surface is avoided. In other words, the calculation does not freeze if it is within about 40 minutes, but it is set to 10 minutes in this embodiment for safety reasons, and is not necessarily restricted to 10 minutes.

The reason why the count number is set to two is to eliminate the partial freezing during the supercooling operation by continuing the operation at 3 ° C. for a while. There is no.

FIG. 4 is a graph plotting the change in the temperature of the refrigerator 23 and the temperature of the food according to the first embodiment. The food such as Chinese cabbage and cabbage does not freeze even when the food temperature becomes 0 ° C. or less. Confirmed that it is saved. In addition, it has been confirmed that the food having a temperature of 0 ° C. or less is matured and becomes delicious. In particular, leaf vegetables close their pores and evaporate at an initial stage, but the evaporation amount decreases when the temperature is stabilized. .

The variable capacity compressor 69 and the first and second cool air circulation fans 35 and 55 are used to
Since the rotation speed can be varied according to the temperature condition of the freezer 25, the temperature fluctuation in the freezer is small, so that optimal control can be performed according to the set temperature of each target temperature separate room, and power saving can be measured. it can.

(Embodiment 2) FIG. 5 is a sectional view showing the internal structure of a subcooling control refrigerator according to Embodiment 2 of the present invention. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 5, in the first evaporator 33, the cool air that has undergone heat exchange is supplied by a first variable capacity cool air circulation fan 35 into multi ducts 90 and 92 provided with a plurality of outlets (described later). Is transported forward to the opening / closing door 17 side, discharged into the refrigerator 23 through the outlets 94 and 96, flows through the refrigerator compartment 9 and the vegetable compartment 11 as indicated by the arrows, and again undergoes the first evaporation from the rear cool air passage 41. It is set such that an appropriate refrigerator temperature can be obtained by repeating the circulation returning to the heater 33. The cool air flow path 41 is formed by cutting out a part of the rear surface of the shelf, and providing an opening 43 that passes from the refrigerator 9 to the vegetable compartment 11 on the front side.

The top surface multi-duct 90 and the side surface multi-duct 92 have a function of transporting cool air to the vicinity of the door regardless of the size of the storage of the insulated products in the refrigerator, so that all the rooms are cooled uniformly. It is possible to avoid the spot-like cooling of the cool air by the cooling operation, and it is possible to prevent local freezing.

[0054]

As described above, the present invention provides an insulating box having an openable and closable door, cooling means for cooling the interior of the insulating box, and detecting the temperature of the insulating box in the refrigerator. Temperature detecting means, and control means for interlocking the cooling means and the temperature detecting means and controlling the inside of the refrigerator to a predetermined temperature set value, and the temperature set value in the refrigerator of the insulated box is normally stored. It is operated in the refrigeration temperature zone above the freezing point of the insulated product, and during the supercooling operation, it is operated in the supercooling temperature zone, which is the temperature set value below the freezing point of the insulated product, for a predetermined time to store the insulated product. In this case, the supercooled product is temporarily kept below the freezing point, but the freezing does not proceed immediately, so that the supercooled state is maintained. Further, even if the freezing is started, the freezing does not easily proceed because the heat of coagulation is required, and the flavor of the fresh food in the supercooled state is brought out, and the effect of promoting the ripening is exhibited. Further, in vegetables and the like, the pores shrink and the evaporation of water is reduced, which has an evaporation suppressing effect.

When the insulated product is food such as fruits and vegetables, fresh vegetables, cereals, nuts, seafood, meat, paste, etc., the freezing point is set to 0 ° C., the freezing point of water. ,
A supercooling controlled refrigerator that can handle all foods, regardless of the moisture content in the food.

Further, by detecting the time when the opened door is closed by the detecting means and starting the supercooling operation, the inside of the refrigerator raised by opening and closing the door is lowered at a stretch, and the new cooling product is quickly supercooled. By doing so, the freshness preserving effect and the aging effect of the cold-retained product are effectively given.

After the operation in the supercooling temperature zone is completed,
By setting the time when the operation and the stop of the cooling means according to the temperature set value in the normal refrigeration operation is repeated one or more times as the start time of the supercooling operation, even if the food whose freezing has advanced locally appears. In this case, a single cycle of the normal refrigeration operation is performed to thaw, and freezing is surely prevented.

When two wet filter papers are placed on a glass plate and the temperature of the thermometer sandwiched between the two filter papers is taken as the surface temperature of the cold-retained article, the surface of the cold-retained article in the refrigerated temperature zone is obtained. Temperature 1
By setting the predetermined operation time in the supercooling temperature zone to be shorter than 80 times the unit time with respect to the unit time required to decrease K, the supercooling operation is performed until the heat of the solidification heat is consumed by cooling. The destruction of the cells due to complete freezing can be prevented.

A refrigeration cycle in which the refrigerant passes through the compressor, the condenser, the throttle valve, and the evaporator and returns to the compressor again, and a multi-cycle in which the cool air cooled in the evaporator is uniformly circulated in the refrigerator in the heat insulating box. By having a cooling means composed of a duct and a cool air circulation fan, the temperature of the discharged cool air is made as close as possible to the temperature inside the refrigerator, and the temperature inside the refrigerator is made uniform without being affected by the amount stored in the refrigerator. Driving can be performed reliably.

Further, the cooling air circulation fan is of a variable capacity type,
It has rotation speed control means for controlling the rotation speed of the cool air circulation fan by means of temperature detection means, in order to prevent drying and promote aging by increasing the air volume during the supercooling operation and bringing it into a supercooled state as soon as possible. It is.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal structure of a supercooling control refrigerator according to a first embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram according to Embodiment 1 of the present invention.

FIG. 3 is a flowchart showing a basic operation according to the first embodiment of the present invention.

FIG. 4 is a characteristic diagram showing a refrigerator temperature set value and a product temperature change according to the first embodiment of the present invention.

FIG. 5 is a sectional view showing an internal structure of a subcooling control refrigerator according to a second embodiment of the present invention.

FIG. 6 is a characteristic diagram showing a change in a set temperature and a product temperature in a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated box 3 Refrigerator 17, 18 Door 21 Insulated product 23 Inside refrigerator 33 Evaporator 35 First cool air circulation fan 55 Second cool air circulation fan 69 Compressor 71 Condenser 73, 74 Throttle valve 77 Cooling mechanism (cooling means) ) 78 Refrigeration cycle 79 Temperature detection mechanism (temperature detection means) 81 Temperature detection mechanism 83 Control device (control means) 90, 92 Multi duct

Claims (7)

[Claims] An insulating box having an openable and closable door, cooling means for cooling the inside of the refrigerator of the heat insulating box, temperature detecting means for detecting the temperature of the heat insulating box inside the refrigerator, and the cooling means And a control means for controlling the inside of the refrigerator to a predetermined temperature set value by interlocking the temperature detection means with the temperature detection means. The supercooling control is operated in the above refrigeration temperature zone, and is operated in a supercooling temperature zone that is a temperature set value below the freezing point of the insulated product for a predetermined time during the supercooling operation, and stores the insulated product. refrigerator. 2. Insulated products are foods such as fruits and vegetables, fresh vegetables, cereals, nuts, seafood, meat, paste, etc.
The supercooling control refrigerator according to claim 1, wherein the freezing point is 0 ° C, which is a freezing point of water. 3. The supercooling operation is started by detecting when the opened door is closed by the detecting means.
Or the supercooling control refrigerator according to 2. 4. After the operation in the supercooling temperature zone is completed, the time when the operation and the stop of the cooling means according to the temperature set value in the normal refrigeration operation are repeated one or more times is defined as the start time of the supercooling operation. The supercooling control refrigerator according to claim 1 or 2, wherein: 5. When a filter paper containing two sheets of water is placed on a glass plate, and the value of a thermometer sandwiched between the two sheets of filter paper is taken as the surface temperature of the cool-keeping article, Surface temperature is 1
5. The unit according to claim 1, wherein the predetermined operation time in the supercooling temperature zone is set to be shorter than 80 times the unit time with respect to the unit time required to decrease K. 6. Subcooling control refrigerator. 6. A refrigeration cycle in which a refrigerant passes through a compressor, a condenser, a throttle valve, and an evaporator and returns to the compressor again, and a plurality of units for uniformly circulating cool air cooled by the evaporator in a refrigerator in an insulated box. The supercooling control refrigerator according to any one of claims 1 to 5, characterized in that the cooling means is configured by a multi-duct provided with the air outlet of (1) and a cool air circulation fan. 7. The supercooling control refrigerator according to claim 6, wherein the cooling air circulation fan is of a variable capacity type, and rotation speed control means for controlling the rotation speed of the cooling air circulation fan by temperature detection means.