JP4985833B2 - Supercooling control refrigerator - Google Patents

Description

  The present invention relates to a supercooling control refrigerator for temporarily keeping the temperature in a refrigerator for storing and storing fresh food or the like in a supercooled state below a freezing point and promoting the long-term storage of food and the deliciousness of food. About.

  In recent years, in order to preserve fresh foods such as fruits and vegetables, meat and seafood, or processed foods such as tofu, ham, and kamaboko in a refrigerated condition, it is preferable to store them at a temperature that is as low as possible without freezing and at a humidity that is as high as possible without condensation. High humidity technology and soaking technology have been developed. As a typical operation method, there is a method by wall surface cooling. Wall cooling means cooling the wall surface in the refrigerator to around -3 ° C to 3 ° C with the cold air flowing around it, and improving the airtightness in the refrigerator by attaching a door to make the inside of the refrigerator uniformly in the range of 0-5 ° C. While cooling, it captures the moisture that enters by opening and closing the door, thereby increasing the humidity. Natural cooling from the 4th or 5th wall without leakage or entry of cold air, the refrigerator can be cooled uniformly and reliably, and even if the inside temperature is cooled to 0 ° C, the temperature inside the refrigerator There is little unevenness and there is little freezing partially.

  However, in order to cool uniformly, there is a limit to the storage capacity, and as the storage capacity increases, the ratio of the cooling area decreases, and the distance between the cooled wall and the cold insulation product increases, and the storage capacity increases. The food placed in the central part takes time until it becomes uniform, and the cooling speed becomes very slow. In other words, although there are few problems in keeping cold things or keeping them cold for a long time, the doors are frequently opened and closed like household refrigerators, and foods and soft drinks that are kept at room temperature It takes time to put in and out beer, etc., and cool those cold-reserved products from room temperature to an appropriate temperature, which significantly reduces the commercial value.

  Therefore, in order to increase the cooling rate in the refrigerator, the refrigerant passes through the compressor, the condenser, the throttle valve, the evaporator, and returns to the compressor again. The cold air cooled by the evaporator is cooled in the refrigerator with a cold air circulation fan. An indirect cooling method in which the inside of the refrigerator is cooled by a cooling mechanism that discharges to the inside is preferable.

  However, in this method, cold air having a temperature lower than the set temperature in the cabinet is blown, and in order to adjust to the set temperature in the cabinet, cold air is blown in conjunction with the cold air circulation fan, the compressor, and the temperature detector in the cabinet. Intermittent operation is required. That is, the product temperature curve repeats up-and-down fluctuations as shown in the graph of changes in the set temperature in the refrigerator and the product temperature in FIG.

  In addition, there is a place where cold air does not rotate in the stagnant part in the refrigerator and the cooling is insufficient, and there is a spot that is supercooled in the vicinity of the cold air outlet. As a result, large temperature unevenness occurs in the refrigerator. In consideration of this temperature unevenness, it was necessary to keep the entire set temperature high so that the food does not freeze in places where the temperature is low or in temperature fluctuations. In particular, when fresh vegetables and fruits are frozen, the moisture in the cells is frozen, and the cells are destroyed by expansion due to freezing. Therefore, storage at a temperature considerably higher than the optimum storage conditions for fresh foods is unavoidable in a refrigerator, and it has been very difficult to maintain freshness.

  There is a method to reduce the amount of cool air that flows by reducing the opening and closing of the damper to equalize the temperature with the indirect cooling method, but if the refrigerator capacity is small, it can achieve considerable temperature equalization, but the capacity is similar to wall cooling As the value increases, the temperature unevenness increases.

Furthermore, in such a cooling method, since it passes through the very low evaporator surface, dehumidification is performed on the evaporator surface, and the cold air blown out has a low relative humidity, which promotes drying of the food that is a cold insulator.

  As a solution to the above problem, Patent Document 1 includes a refrigerator consisting of a refrigeration room and a vegetable room and a freezer in different temperature zones, and the rotation of a cold air circulation fan and variable capacity compressor according to each cooling temperature. Each cool air circulation fan can be adjusted in the refrigerator according to the output of the temperature sensor, which is the internal temperature detection mechanism, and the temperature of each target temperature can be adjusted. The air volume can be adjusted in order to eliminate a large temperature difference between the temperature and the temperature of the cool air fed by the cool air circulation fan.

  In recent household refrigerator-freezers, a refrigeration evaporator and a refrigeration evaporator are connected in parallel, the evaporation temperature in the refrigeration evaporator is increased, the surface temperature of the evaporator is set higher, and the dehumidification effect is lowered. When the compressor is stopped, a mechanism is installed to humidify the refrigerator by operating only the cold air circulation fan for the frost on the evaporator inside the refrigerator.

  In Patent Document 2, the cold air cooled by the cooler passes through the cold air guide passage and is supplied into the refrigerator cabinet. However, by providing a rotating cold air discharge member at the cold air discharge port, the cold air is distributed to the left and right. It has been devised to cool uniformly.

  Patent Document 3 describes a method for imparting stress to a living body to improve umami. In other words, give breathing organisms such as vegetables, fruits, cereals, live fish, shellfish, etc., stress treatment by drying, hydration, pressure, light, snow, sound waves, etc. in a low temperature zone below 0 ° C. It is described that it can secrete various umami-related components into the living body, fully immature things can be fully ripe, things that are not originally seasonal taste can be improved to seasonal taste, and further taste can be improved. As a natural phenomenon that proves its effect, there is an increase in the sweetness of Chinese cabbage when frost falls.

JP-A-10-318645 JP-A-8-247608 Japanese Patent Laid-Open No. 7-115952

  However, as disclosed in Patent Document 1, a cold air circulation fan corresponding to each cooling temperature is provided, the number of revolutions is set according to the refrigeration temperature zone with a variable capacity compressor, and each cold air circulation fan is set according to the output of the temperature sensor. When the target temperature can be adjusted by changing the number of rotations, and as in Patent Document 2, the cold air is distributed to the left and right by the rotating cold air discharge member of the cold air discharge port so that the inside of the refrigerator is uniformly cooled. The food cannot be stored in a supercooled state as shown in Patent Document 3, and if the setting of the internal temperature is lowered, the freezing of the food progresses in a part of the internal storage, cells are destroyed, and the taste of the food The decline will proceed.

  In addition, even if stress treatment with drying, hydration, pressure, light, snow, sound waves, etc. is applied in a low temperature zone of 0 ° C. or lower, it is impossible to keep the temperature constant for a long time in a home refrigerator. When ice nuclei are formed by stimulation, freezing starts and the cells of the fresh food are destroyed.

  Accordingly, an object of the present invention is to provide a supercooling control refrigerator that can extract the taste of the fresh food, promote ripening, and suppress evaporation of vegetables and the like.

In order to achieve the above object, the present invention provides a heat insulating box having a door that can be opened and closed, a cooling means for cooling the refrigerator in the heat insulating box, and a temperature for detecting the temperature in the refrigerator of the heat insulating box. Detecting means, and control means for controlling the inside of the refrigerator to a predetermined temperature set value by interlocking the cooling means and the temperature detecting means, wherein the cooling means includes a cold air circulation fan, an evaporator, and a compressor And at the time of supercooling operation, the cool air circulating fan is operated in a supercooling temperature zone that is a temperature set value lower than the freezing point of the cold insulated product, and the cold air circulating fan is stored even if the cold storage product is stored and the compressor is stopped. Rotation is continued until the inside of the refrigerator reaches a normal refrigeration operation set temperature or higher, and the inside of the refrigerator is humidified with frost on the surface of the evaporator .

  Also, when the open door is closed by the detection means, the supercooling operation is started, or after the operation in the supercooling temperature zone is finished, the cooling means according to the temperature setting value in the normal refrigeration operation The time when the operation and the stop are repeated at least once is set as the start timing of the supercooling operation.

  Also, when two filter papers containing water are placed on a glass plate and the value of the thermometer sandwiched between the two filter papers is the surface temperature of the cold insulation product, the surface temperature of the cold insulation product in the refrigeration temperature zone is The predetermined operation time in the supercooling temperature zone is shorter than 80 times the unit time with respect to the unit time required to decrease by 1K.

  In addition, 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 the multi-duct and the cold air that circulates the cold air cooled by the evaporator uniformly in the refrigerator of the heat insulating box. The cooling means comprises a circulation fan.

  Further, the present invention is characterized in that the cold air circulation fan is a variable capacity type, and the rotation speed control means for controlling the rotation speed of the cold air circulation fan by the temperature detection means.

  As described above, the present invention brings out the taste of fresh food in a supercooled state and exhibits the effect of promoting aging. Furthermore, in vegetables and the like, the pores contract and the evaporation of moisture is reduced.

Sectional drawing which shows the internal structure of the supercooling control refrigerator in Embodiment 1 of this invention Refrigerant circuit diagram in Embodiment 1 of the present invention The flowchart which shows the basic operation | movement in Embodiment 1 of this invention. Characteristic chart showing temperature set value in refrigerator and product temperature in Embodiment 1 of the present invention Sectional drawing which shows the internal structure of the supercooling control refrigerator in Embodiment 2 of this invention. Characteristic diagram showing changes in the conventional refrigerator temperature setting value and product temperature

1st invention is the heat insulation box which has the door which can be opened and closed, the cooling means which cools the inside of the said heat insulation box, the temperature detection means which detects the temperature in the refrigerator of the said heat insulation box, and the said cooling And a control means for controlling the inside of the cabinet to a predetermined temperature set value by linking the temperature detecting means and the temperature detecting means, and the cooling means has at least a cold air circulation fan, an evaporator, and a compressor. Sometimes the temperature set value in the refrigerator of the heat insulation box is operated in a refrigerated temperature zone above the freezing point of the stored cold storage product, and during the overcooling operation, the temperature set value is below the freezing point of the cold storage product for a predetermined time. Even if the compressor is stopped while operating in a supercooling temperature zone, the cold- air circulating fan continues to rotate until the time when the inside of the refrigerator is equal to or higher than the normal refrigeration operation set temperature, and the surface of the evaporator Humidify the refrigerator with frost It characterized in temporarily cold product becomes supercooled state rather than be immediately frozen but become less freezing point progresses, and, in order also in need of heat of solidification as frozen is started Does not complete freezing easily. In addition, fresh food in a supercooled state produces an effect as shown in Japanese Patent Laid-Open No. 7-115952, and draws out the taste of fresh food to promote ripening. In addition, in vegetables and the like, the pores contract and water evaporation is reduced.

In the second invention, when the cold-reserved product is a food such as fruits and vegetables, fresh vegetables, cereals, nuts, seafood, meats, pastes, etc., the freezing point is 0 ° C., the freezing point of water. By setting the temperature to 0 ° C., it is possible to obtain a supercooling control refrigerator that can handle all foods regardless of the moisture content in the foods.

  According to a third aspect of the present invention, when the open door is closed by detecting means and the supercooling operation is started, the inside of the refrigerator raised by the opening and closing of the door is lowered at a stretch, and a new cold-reserved product is supercooled. By doing so, the freshness retention effect and the aging effect of the cold-reserved product are given earlier.

  According to a sixth aspect of the present invention, the refrigerant passes through the compressor, the condenser, the throttle valve, and the evaporator, and returns to the compressor again. The cold air cooled by the evaporator is uniformly circulated in the refrigerator of the heat insulating box. By having a cooling means consisting of a multi-duct and a cold air circulation fan, the temperature of the discharged cold air is made as close as possible to the inside temperature, and the temperature inside the refrigerator is made uniform regardless of the amount of storage, ensuring overcooling Can be done.

  The seventh aspect of the invention is that the capacity of the cold air circulation fan is variable and has a rotation speed control circuit that controls the rotation speed of the cold air circulation fan by temperature detection means. In this state, drying is prevented and aging is promoted.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view showing the internal structure of the supercooling 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 from above, and the refrigerator compartment 9, the vegetable compartment 11, the first freezer compartment 13, The second freezer compartment 15 is provided with opening / closing doors 17, 18, 19, and 20, respectively, and the opening and closing of the opening / closing doors 17, 18, 19, and 20 allows the food and other cold insulation products 21 to be taken in and out.

  A space between the vegetable compartment 11 and the first freezer compartment 13 is divided into upper and lower parts independently by a heat insulating wall 22 into a refrigerator 23 and a freezer 25 having different set temperatures.

  The refrigerator interior 23 is composed of a refrigerator compartment 9 and a vegetable compartment 11, and the refrigerator compartment 9 and the vegetable compartment 11 are partitioned up and down by a partition plate 27 so that cold air circulates. Since the partition plate 27 circulates cold air at the same temperature, no heat insulating material is required, and the partition plate 27 is formed of the same material as the removable shelf 29 and the storage container 31 provided in the refrigerator compartment 9, and has a small occupied space. It is set so that it can be used.

In the first evaporator 33, the heat exchanged cold air is sent forward by the first variable capacity cold air circulation fan 35 to the front side of the open / close door 17, and then flows through the refrigerator compartment 9 and the vegetable compartment 11 as indicated by arrows. By repeating the circulation from the cold air flow path 41 at the rear to the first evaporator 33 again, it is set so that an appropriate refrigerator temperature can be obtained.
The cold air flow path 41 is formed by notching a part of the rear surface of the shelf and providing an opening 43 through the refrigerator 9 to the vegetable compartment 11 on the front side.

The refrigerator 25 includes a first freezer compartment 13 and a second freezer compartment 15, and is partitioned vertically by a partition plate 49 so that cold air circulates. The partition plate 49 does not require a heat insulating material since cold air of the same temperature circulates, and is formed thin with the same member as the storage container 51 provided in the warehouse. One of the cold air exchanged heat in the second evaporator 53 is fed into the first freezer compartment 13 from the cold air flow passage 61 of the partition plate 49 by the second variable capacity cold air circulation fan 55, and the other is connected to the corner wall 63. It is sent to the second freezer compartment 15 from between the partition plates 49. The first freezer compartment 13
The cold air that has passed through the inside 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 storage container 51 of the second freezer compartment 15 and the refrigerator It is set so that a temperature in the freezer of −15 ° C. or lower can be obtained by repeating the circulation through the gap with the bottom wall 66 and returning to the second evaporator 53 again.

  The machine room 67 provided at the lowermost part of the heat insulating box 1 is provided with a variable capacity compressor 69 and a condenser 71, a three-way valve 72, a first throttle valve 73, and a second throttle valve 74. In addition to the first evaporator 33, the first variable capacity cold air circulation fan 35, the second evaporator 53, and the second variable capacity cold air circulation fan 55 described above, the cooling mechanism 77 including the refrigeration cycle shown in FIG. (Cooling means) is configured.

  That is, in the refrigeration cycle shown in FIG. 2, the first evaporator 33 and the second evaporator 53 are connected in parallel, and the refrigerant discharged from the compressor 69 is passed in two directions by the condenser 71 and the three-way valve 72. One is passed from the first throttle valve 73 to the first evaporator 33, and the other is passed through the second throttle valve 74 in the order of the second evaporator 53, and again. A refrigeration cycle 78 returning to the compressor 69 is configured.

  In the refrigerator configured as described above, the variable capacity compressor 69 is provided with a temperature detection mechanism 79 (temperature detection means) of the refrigerator 23 in the refrigerator 23 constituting each temperature zone space. 25 is provided with a temperature detection mechanism 81 for the inside of the freezer 25, and the number of rotations is set in accordance with the temperature zone of either the refrigerator 23 or the freezer 25 according to the output and the set temperature. The first and second variable capacity cold air circulation fans 35 and 55 adjust the temperature of the refrigerator 23 and the freezer 25 by variably controlling the number of rotations according to the output of the internal temperature detection mechanisms 79 and 81. Can be performed respectively.

  The temperature setting in the refrigerator 23 is set by the control device 83 for the exterior panel of the heat insulation box 1, and can be set to two temperatures, a refrigeration temperature value and a supercooling temperature value, which are bordered by the freezing temperature of the food. It is.

  The specific value used in the first embodiment is that the first freezer compartment 13 and the second freezer compartment 15 are set to −18 to −20 ° C. as the freezing temperature, and the temperature in the refrigerator 23 of the refrigerator compartment 9 and the vegetable compartment 11 is set. Is set to a refrigeration temperature value of 3 ° C and a supercooling temperature value of -5 ° C. In the freezer 25, the cold air that has passed through the second evaporator 53 by driving the second variable capacity cold air circulation fan 55 is supplied to the first freezer compartment 13 and the second freezer compartment 15 as described above. The number of rotations of the second cool air circulation fan 55 is controlled so that the temperature of the blown air becomes −24 ° C.

  Further, the temperature detection mechanism 79 and the cooling mechanism 77 are linked by a control device 83 (control means) to control the temperature in the refrigerator 23. That is, the inside of the refrigerator 23 is initially maintained at 3 ° C., but the inside of the refrigerator 23 in the control device 83 is detected by detecting the opening / closing of the door 17 of the refrigerator or the door 18 of the vegetable room by a detecting means (not shown). The set temperature is switched to −5 ° C., and the supercooling operation is started. The supercooling setting operation is detected to be −5 ° C., and is completed when about 10 minutes have passed by the timer 85 in the control device 83, and then the normal cooling operation at 3 ° C. is switched again. In addition, the counter 87 that counts the number of notches based on 3 ° C. in the refrigerator starting from the time of switching to the refrigeration operation in the control device 83 causes the excess of −5 ° C. again after the count number has passed twice. The cooling operation is set to start. Therefore, after 10 minutes, the normal operation is resumed at 3 ° C. That is, when the door is opened or closed or the timing of whether the notch count indicates 2 is reached, the above operation is repeated.

Since the temperature of the first evaporator 33 is directly connected to the second throttle valve 73 and the evaporator 53 shown in FIG. 2, the evaporation temperature can be freely set by the throttle valve 73. In the present embodiment, -10
The temperature was set to ° C. Therefore, the rotational speed of the first variable capacity cold air circulation fan 35 is controlled so that the cold air ejection temperature is about −5 ° C. Further, when the temperature inside the cabinet changes due to a change in the outside air temperature or the opening / closing of the door, the rotation speed of the variable capacity compressor 69 is controlled according to the temperature inside the warehouse, but the variable capacity cold air circulation fan during the supercooling setting operation. 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, but the rotational speed of the first cold air circulation fan 35 so that the cold air blowing temperature to the refrigerator compartment 9 becomes the set temperature. And the temperature in the refrigerator 23 can be maintained. Even if the compressor is stopped, the first cool air circulation fan 35 continues to rotate until a predetermined time comes, and humidifies the inside 23 of the refrigerator with frost on the surface of the first evaporator 33.

  With reference to the flowchart centering on temperature control in the refrigerator shown in FIG. 3, the normal operation operation of the refrigerator and the operation operation at the time of switching to the supercooling setting operation according to the first embodiment of the present invention will be described.

  The refrigerator 3 is powered on and the variable capacity compressor 69 and the first and second variable capacity cold air circulation fans 35 operate (step 320). Then, it is checked whether or not the temperature in the refrigerator is 3 ° C. or higher (step 330). If it is 3 ° C. or higher, the procedure returns to step 320 and the same operation is repeated. When the temperature is 3 ° C. or lower, the compressor 69 is turned off (step 350). At this time, the circulation fan 35 is kept ON for a predetermined time, the frost attached to the first evaporator 33 is melted, and the inside of the refrigerator 23 is humidified.

  Next, the internal temperature of the refrigerator 23 is checked again (step 360). If it is 3 ° C or higher, the counter 87 is counted once, and if the integrated count is 2 or less, the process goes to step 320. Turn on the return compressor. If the refrigerator temperature is 3 ° C. or lower in step 360, the compressor 69 is kept stopped. When the steps from step 320 to step 360 are repeated and the count number becomes 2 or more, the supercooling operation (step 380) is started. That is, the compressor 69 and the cold air circulation fan are operated at the maximum capacity (step 390), and the temperature in the refrigerator is cooled to -5 ° C.

  In step 400, if the temperature in the refrigerator is −5 ° C. or higher, the compressor 69 and the circulation fan 35 are kept in operation, and if the temperature is −5 ° C. or lower, the timer check (step 410) is entered. That is, the elapsed time of the timer that measures the time since the start of the supercooling operation is checked. If it is within 10 minutes, the operation is continued until 10 minutes, and if 10 minutes have elapsed, the process returns to step 360. Repeat the same operation.

  Further, when a door open / close signal is input, 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 the glass plate as a simulated load in the refrigerator 23, and the value of the thermometer sandwiched between the two filter papers is set. Calculated based on the result of an experiment in which the unit time required for the surface temperature of the refrigerated product to decrease by 1K in the refrigerated temperature range was 30 seconds when the surface temperature of the refrigerated product was used. The operating time is set to be shorter than 80 times the unit time to avoid freezing of the food surface. That is, in calculation, if it is within about 40 minutes, it does not freeze, but in the present embodiment, it is set to 10 minutes in the present embodiment, and is not necessarily restricted to 10 minutes.

  The reason why the number of counts is set to two is to eliminate partial freezing during the supercooling operation by continuing the operation at 3 ° C for a while, and there is no problem if the refrigeration operation at 3 ° C is performed once or more.

  FIG. 4 is a graph plotting the 23 set temperature in the refrigerator and the change in the product temperature in the first embodiment, but the product temperature of foods such as Chinese cabbage and cabbage is preserved without freezing even when the product temperature is 0 ° C. or less. It was confirmed. In addition, it has been confirmed that foods having a temperature of 0 ° C. or lower as described above are matured and become tasty. In particular, leaf vegetables close in the pores and evaporate initially, but when the temperature stabilizes, the amount of evaporation decreases. .

  Further, since the variable speed compressor 69 and the first and second cold air circulation fans 35 and 55 can be used to change the rotation speed according to the temperature conditions in the refrigerator 23 and the freezer 25, the temperature fluctuation in the refrigerator Therefore, optimal control suitable for the set temperature of each target temperature can be performed, and power saving can be measured.

(Embodiment 2)
FIG. 5 is a cross-sectional view showing the internal structure of the supercooling control refrigerator in Embodiment 2 of the present invention. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In FIG. 5, in the first evaporator 33, the heat exchanged cold air is opened and closed by multi-ducts 90 and 92 provided with a plurality of outlets (described later) by the first variable capacity cold air circulation fan 35. 17 is carried forward, discharged from the outlets 94 and 96 into the refrigerator 23, flows through the refrigerator compartment 9 and the vegetable compartment 11 as shown by the arrows, and again passes from the rear cool air passage 41 to the first evaporator 33. It is set so that an appropriate refrigerator temperature can be obtained by repeating the return circulation. The cold air flow path 41 is formed by notching a part of the rear surface of the shelf and providing an opening 43 through 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 the function of carrying the cold air to the vicinity of the door regardless of the size of the storage of the cold storage product in the cabinet, and are cooled to a uniform temperature throughout the room. It can be avoided from spot cooling of cold air, and local freezing can be prevented.

  As described above, the present invention comprises a heat insulating box having a door that can be opened and closed, a cooling means for cooling the inside of the heat insulating box, a temperature detecting means for detecting the temperature in the refrigerator of the heat insulating box, The cooling means and the temperature detection means are interlocked to have a control means for controlling the interior to a predetermined temperature set value. Normally, the temperature set value in the refrigerator of the heat insulation box is frozen for the stored cold storage product. It is operated in a refrigerated temperature zone above the point, and is operated in a supercooling temperature zone that is a temperature setting value below the freezing point of the cold insulation product for a predetermined time during the supercooling operation, and is characterized by storing the cold insulation product, Temporarily keep the cooled product below the freezing point, but it will not freeze immediately, so keep it supercooled. Moreover, even if freezing is started, the freezing does not proceed easily because it requires heat of solidification, and the effect of promoting the ripening is exhibited by drawing out the taste of fresh food in a supercooled state. Furthermore, in vegetables and the like, the pores contract and the evaporation of moisture is reduced.

  In addition, when the frozen product is food such as fruits and vegetables, fresh vegetables, cereals, nuts, seafood, meats, pastes, etc., by setting the freezing point to 0 ° C., the freezing point of water, Regardless of the moisture content, it becomes a supercooled control refrigerator that can handle all foods.

  In addition, by detecting the time when the open door is closed by the detection means and starting the supercooling operation, the inside of the refrigerator that has risen due to the opening and closing of the door is lowered at a stretch, and a new cold insulation product is quickly put into the supercooling operation. It effectively confers a freshness-keeping effect and an aging effect on cold-preserved products.

Also, after finishing the operation in the supercooling temperature zone, when the operation and stop of the cooling means by the temperature set value in the normal refrigeration operation is repeated one or more times, it is set as the start timing of the supercooling operation, Even if food that has started to freeze has appeared, it can be freed from the effects of the supercooling operation by performing the cycle in the normal refrigeration operation even once, and the freezing is surely prevented.

  Thus, after the operation in the supercooling temperature zone is finished, the time when the cooling means is activated and stopped by the temperature set value in the normal refrigeration operation at least once is set as the start timing of the supercooling operation. Thus, even if foods that have started to freeze locally appear, they can be thawed by performing a cycle in a normal refrigeration operation even once to reliably prevent freezing.

  Also, when two filter papers containing water are placed on a glass plate and the value of the thermometer sandwiched between the two filter papers is the surface temperature of the cold insulation product, the surface temperature of the cold insulation product in the refrigeration temperature zone is The predetermined operation time in the supercooling temperature zone is shorter than 80 times the unit time with respect to the unit time required to decrease by 1K.

  In this way, when two wet filter papers are placed on a glass plate, and the value of the thermometer sandwiched between the two filter papers is the surface temperature of the cold insulation product, the surface temperature of the cold insulation product in the refrigeration temperature zone Over a unit time required for a 1K drop in temperature, the predetermined operating time in the supercooling temperature zone is set to be shorter than 80 times the unit time, so that the amount of heat of solidification heat is consumed by cooling. By stopping the operation, it is possible to prevent destruction of the cells due to complete freezing.

  In addition, 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 the multi-duct and the cold air that circulates the cold air cooled by the evaporator uniformly in the refrigerator of the heat insulating box. By having a cooling means composed of a circulation fan, the temperature of the discharged cold air is brought as close as possible to the inside temperature, and the temperature inside the refrigerator is made uniform without being affected by the amount of storage in the refrigerator, thereby ensuring supercooling control operation. Can be done.

  Also, the capacity of the cold air circulation fan is variable, and it has a rotation speed control means for controlling the rotation speed of the cold air circulation fan by the temperature detection means. During supercooling operation, the air volume is increased and the supercooling state is made as soon as possible. It is intended to prevent drying and promote aging.

  The supercooling controlled refrigerator of the present invention can be applied to a refrigerator for storing food because it can promote long-term storage of food and the deliciousness of food.

DESCRIPTION OF SYMBOLS 1 Heat insulation box 3 Refrigerator 17,18 Door 21 Cold storage product 23 Inside of refrigerator 33 Evaporator 35 1st cold air circulation fan 55 2nd cold air circulation fan 69 Compressor 71 Condenser 73, 74 Restriction 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 (5)

A heat insulating box having an openable / closable door, a cooling means for cooling the inside of the refrigerator in the heat insulating box, a temperature detecting means for detecting the temperature in the refrigerator of the heat insulating box, the cooling means and the temperature detecting means. And a control means for controlling the inside of the refrigerator to a predetermined temperature set value. The cooling means has at least a cold air circulation fan, an evaporator, and a compressor, and keeps cold during supercooling operation. The product is operated in a supercooling temperature zone that is a temperature setting value below the freezing point of the product, stores the cold insulation product, and even if the compressor stops, the cold air circulation fan keeps the inside of the refrigerator above the normal refrigeration operation set temperature. The supercooling control refrigerator characterized by continuing to rotate until a certain time and humidifying the refrigerator with frost on the surface of the evaporator.   The cold-reserved product is food such as fruits and vegetables, fresh vegetables, cereals, nuts, seafood, meats, pastes, etc., and the freezing point is 0 ° C., the freezing point of water. The supercooling control refrigerator as described in.   The supercooling control refrigerator according to claim 1 or 2, wherein the supercooling operation is started by detecting the time when the opened door is closed by the detecting means.   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 plurality of outlets for uniformly circulating the cold air cooled by the evaporator into the refrigerator of the heat insulating box The supercooling control refrigerator according to any one of claims 1 to 3, further comprising a cooling unit including a multi-duct and a cold air circulation fan.   5. The supercooling control refrigerator according to claim 4, wherein the cooling air circulation fan is a variable capacity type, and a rotation speed control means for controlling a rotation speed of the cooling air circulation fan by a temperature detection means.