JP4682479B2 - Freezer refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a refrigerator-freezer having a cooking chamber provided with temperature control means for allowing food to pass through a frozen state and a thawed state at least once.
[0002]
[Prior art]
A refrigerator-freezer is a device that suppresses quality deterioration of food by supplying cold air generated by cooling means such as a refrigeration cycle into a food storage and storing food in a refrigerated or frozen state. Widely used as food preservation means. As for the temperature of each food storage, a refrigerator room and vegetable room of + 3 ° C to + 5 ° C, a new temperature zone room of 1 ° C to -3 ° C, and a freezer room of -15 ° C to -20 ° C are generally used. It is a temperature range.
[0003]
However, in recent years, quality improvements during storage of foods and addition of cooking functions have been performed due to intentional changes in temperature during storage. Japanese Patent Laid-Open No. Sho 62-41570 discloses a method of sequentially changing the temperature region by appropriately controlling the air flow introduced into the storage, and Japanese Patent Laid-Open No. Hei 4-73583 discloses FIG. As shown in FIG. 4, there is shown a method of providing a heating means in the storage to perform the temperature raising action.
[0004]
Based on FIG. 10, the latter example will be specifically described. In the figure, refrigerator 1
One compartment is provided with a low temperature cooking chamber 3 surrounded by a heat insulating material 2, and a door 4 that can be opened and closed is installed at the front opening. Reference numeral 5 denotes a cooling air blowing path supplied from a cooling means (not shown), and the inside of the low temperature cooking chamber 3 is maintained at a low temperature by the cooling air supplied from here. On the other hand, a tubular radiant heating type upper heater 6 is provided in the upper part of the low temperature cooking chamber 3, and a plate-like conduction heating type lower heater 7 is provided in the lower part, so that the inside of the low temperature cooking room 3 can be heated. Has been. 8 is a food for low temperature cooking, and 9 is a food container on which the food 8 is placed.
[0005]
In the above configuration, when the food 8 placed in the food container 9 is cooled by the cold air supplied from the air passage 5 and frozen, the moisture (cell liquid) inside the cells of the food 8 is frozen and the volume expands. As a result, cell destruction (such as cell membrane damage and cell wall damage in plant cells) occurs. Thereafter, when the supply of cold air is stopped and the upper heater 6 and / or the lower heater 7 are energized to raise the temperature of the food 8 and defrost, moisture flows out from the cracks in the cells of the broken food 8 and absorbs water. Or the food 8 is softened. At this time, if there is a seasoning material simultaneously supplied in the container 9, the seasoning material can be infiltrated into the food 8 in place of the outflowed water. Thus, a cooking action can be performed in which softening is promoted by the cell destruction that occurs when the food 8 is frozen and thawed, or the permeability is increased and the seasoning material can be easily permeated in a short time by raising the temperature.
[0006]
[Problems to be solved by the invention]
In the conventional configuration for controlling the time of the cooling means and the heating means as described in Japanese Patent Laid-Open No. 4-73583, the refrigeration capacity varies depending on the outside air temperature and the opening / closing of the refrigerator door when performing the freezing and thawing operations. As a result, the frozen state of the food changes, and the freezing may be insufficient or excessive freezing may be performed, resulting in poor texture or excessive freezing time.
[0007]
The present invention eliminates such conventional drawbacks and provides a simple sensing function, thereby realizing an efficient and uniform food freezing and thawing state, and enabling cooking of foods with rich taste and flavor. The object is to provide a refrigerator-freezer with a freeze-thaw treatment function.
[0008]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention includes a refrigerator compartment, a freezer compartment, a cooking compartment, an open / close door of each compartment, a storage container, and a storage means for detecting the cooling means, the heating means and the internal temperature. A cooking chamber having an internal temperature sensor and a door switch that detects the opening / closing of each open / close door automatically sets the freezing operation time of the cooling means, and the food stored in the storage container is frozen and thawed at least once. Refrigeration per opening / closing of the cooking chamber open / close door, the refrigerator compartment / freezer compartment open / close door, and a temperature control means for performing the freeze / thaw treatment by changing the above and a display means for informing the completion of the freeze / thaw treatment. In relation to the extended operating time, From the extended time due to the opening and closing doors of the refrigerator compartment and freezer compartment, The extension time by the open / close door of the cooking chamber is extended, and the freezing time by the cooling means and the thawing time by the heating means are appropriately adjusted according to the usage conditions of the refrigerator-freezer, It is a stable and delicious finish of food. In addition, when the door is opened and closed frequently, the freezing time by the cooling means is lengthened, and at night when there is little opening and closing, the freezing time is shortened so that the result of freezing and thawing cooking of the food fluctuates due to the opening and closing of the door. This is what I did not.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the refrigerator-freezer of the present invention will be described with reference to FIGS.
[0010]
(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a refrigerator-freezer showing Embodiment 1 of the present invention, and FIG. 2 is an enlarged longitudinal sectional view of an essential part of the same refrigerator-freezer.
[0011]
In FIG. 1, 11 is a refrigerator-freezer with a freeze-thaw cooking function, a refrigerator room 12 at about 3 ° C, a vegetable room 13 at about 5 ° C, a freezer room 14 at about minus 20 ° C, and from 10 ° C to minus 20 ° C. It comprises a cooking chamber 15 in which the internal temperature can be freely switched, and each chamber includes doors 16a, 16b, 16c, and 16d that can be freely opened and closed. The cooking chamber 15 is surrounded by a heat insulating wall 17 and formed independently, and a slidable drawer-type storage container 18 integrated with the door 16c is inserted.
[0012]
Reference numeral 19 denotes a refrigeration cycle cooling means for connecting the compressor 20, the condenser 21, the expansion valve 22, and the refrigeration evaporator 23 with a refrigerant pipe 24, and cooling the refrigeration evaporator 23 in the condensing and evaporation cycle of the enclosed refrigerant. In addition, the cooling air around the refrigeration evaporator 23 is introduced into the cooking chamber 15 by the refrigeration fan 25 through the ventilation path 26 and the damper 27. A blower 28 that circulates and stirs the air in the cooking chamber 15 is disposed at the top of the cooking chamber 15.
[0013]
A refrigerating evaporator 29 configured as a part of the cooling means 19 of the refrigerating cycle is located on the back of the refrigerating chamber 12, and the cold air around the refrigerating evaporator 29 is circulated to the refrigerating chamber 12 by the refrigerating fan 30. Configured to stir. The vegetable compartment 13 is cooled by a cooling panel 31 located at the top of the vegetable compartment 13 that is cooled by the cold air in the refrigerator compartment 12.
[0014]
A heat transfer plate 32 made of aluminum having good thermal conductivity is provided at the bottom of the storage container 18 in the cooking chamber 15, and serves as a heating means 33 attached to the heat insulating wall 17 on the lower surface of the cooking chamber 15. It is configured to oppose the heater plate 34. The heater plate 34 as the heating means 33 is located on the heat insulating surface side of the inner bottom wall surface 35 of the cooking chamber 15 and has a configuration in which a clothing nichrome wire is attached to an aluminum foil.
[0015]
36 is a temperature that receives a signal from the external signal transmission means 37, operates the cooling means 19 and the heating means 33, and controls the internal temperature detected by the internal temperature sensor 38 in the cooking chamber 15 for a predetermined temperature and a predetermined time. It is a control means.
[0016]
As the external signal transmission means 37, an outside air temperature sensor 39 that detects an outside air temperature that is the operating environment of the refrigerator 11, an inside temperature sensor 38 in the cooking chamber 15, and the open / close doors 16 a, 16 b, 16 c, and 16 d. There are door switches 41a, 41b, 41c, and 41d that detect opening and closing. The temperature control means 36 grasps each signal sent from the external signal transmission means 37 and estimates it according to each signal, whereby the temperature inside the cooking chamber 15, the freezing operation time, the thawing operation time, and its The total cooking time can be controlled.
[0017]
Reference numeral 42 denotes a start button for starting freeze-thaw cooking. When the start button 42 is pressed, the display panel 44 as the display means 43 starts blinking during cooking to notify that cooking is in progress. . Further, the display means 43 is set so as to notify the remaining time until the completion of cooking by counting down after estimating the processing time of each freezing and thawing by the temperature control means 36 that captures the signal from the external signal transmitting means 37, It has a function to notify completion.
[0018]
The temperature of the cooking chamber 15 is controlled by the temperature control means 36 by a signal from the internal temperature sensor 38, and is set to a new temperature range of 0 to minus 3 ° C. before starting cooking and after cooking is completed. When the start button 42 is pressed, the freeze / thaw process starts. The temperature fluctuation process of freeze-thaw cooking includes a freezing step at the beginning, the freezing operation is started, and after a predetermined time, it becomes a thawing step and becomes a thawing operation. The operation time of freeze-thaw cooking in the first embodiment is set to 8 hours for the freezing operation time and 8 hours for the thawing operation time as a basic mode. The operation may be repeated as necessary, but in this case, it is performed once.
[0019]
Next, correction of the freeze-thaw cooking time by the temperature control means 36 by receiving a signal from the outside air temperature sensor 39 which is one of the external signal transmission means 37 will be described. That is, if the outside air temperature is high, the refrigeration capacity decreases, so the refrigeration operation time is long and the thawing operation time is short, and if the outside air temperature is low, the refrigeration operation time is short and the correction to increase the thawing operation time is necessary. There is.
[0020]
In the first embodiment, the freezing time is 10 hours, the thawing time is 6 hours, the freezing time and the thawing time are 8 hours, which is the basic mode at 15 to 25 ° C., and the freezing time is 15 ° C. or less. The time was set to 6 hours and the melting time to 10 hours.
[0021]
The correction of the freeze-thaw cooking time by the temperature control means 36 upon receiving a signal from the door switch 41 which is one of the external signal transmission means 37 will be described. That is, the cooling capacity varies depending on the opening / closing frequency of the open / close door 16 of each room. Naturally, the higher the frequency, the lower the cooling capacity in the warehouse. Therefore, the freezing time is corrected to be longer according to the opening / closing frequency.
[0022]
In the first embodiment, the extension of the freezing operation time of 10 minutes per opening / closing of the opening / closing door 16c of the cooking chamber 15, the extension of the freezing operation time of 2 minutes per opening / closing of the opening / closing door 16d of the freezing chamber 14, the refrigerator compartment 12. Correction was made to extend the freezing operation time of 1 minute per opening / closing of the doors 16a, 16b of the vegetable compartment 13.
[0023]
It should be noted that the degree of influence on the thawing time was small, and correction of the thawing operation time based on the opening / closing frequency of the door was not particularly required. Therefore, the count-down display on the display means 43 is such that the remaining time is determined after the refrigeration operation time has elapsed, so that the cooking completion time is displayed on the display panel 44 after entering the thawing process.
[0024]
In addition, the signal from the internal temperature sensor 38 which is one of the external signal transmitting means 37 is received, and the temperature control means 36 corrects the freezing and thawing cooking time with reference to the temperature change graph by the difference in the cooking chamber load in FIG. explain.
[0025]
That is, the processing amount as the basic mode is set to about 1 kg of food, but if the amount of food stored in the storage container 18 is large, it takes time to freeze the food to the center. It takes time to melt. Therefore, it is necessary to estimate the amount of food to be processed, but the amount of food is estimated by measuring the cooling speed in response to a signal from the internal temperature sensor 38.
[0026]
That is, the elapsed time from 1 ° C. to minus 5 ° C. of the internal temperature sensor 38 is measured by changing the amount of food (load), and the graph of FIG. 3 shows a case where 1 kg of the standard food is stored. The temperature change in the cooking chamber takes about 40 minutes from 1 ° C. to minus 5 ° C., as shown by the curve B in FIG. 3, and similarly at 0.5 kg, it is 30 as shown by the curve A in FIG. From the experimental results, it was found that it took about 50 minutes at 1.5 kg as shown by the curve in FIG.
[0027]
Next, the freezing time at the center temperature was further obtained by a confirmation experiment, and the necessary freezing and thawing time for the processing amount was derived. As a result, in the first embodiment, when the time from 1 ° C. to minus 5 ° C. is 40 minutes, 8 hours in the basic mode is an appropriate freezing operation time. In addition, it was confirmed that when the amount of increase / decrease was 0.2 hours, the finished state of the food by the processing amount became constant.
[0028]
From the above, from the elapsed time from 1 ° C. to minus 5 ° C., the freezing operation time and the thawing operation time are corrected by 0.2 hour with respect to the increase / decrease of 1 minute.
[0029]
Next, the operation and action of the first embodiment will be described with reference to the flowchart of FIG.
[0030]
First, food is placed on the heat transfer plate 32 of the storage container 18 and stored in the cooking chamber 15. Next, the start button 42 is pressed to start freeze-thaw cooking. Although the temperature in the cooking chamber 15 is initially set to 0 ° C., when the refrigeration operation as the refrigeration process is started by pressing the start button 42, the timer A 45 for setting the refrigeration operation time starts to drive, and the display means 43. The display panel 44 lights up during cooking, and at the same time, the cold air cooled by the cooling means 19 at the back of the cooking chamber 15 flows into the cooking chamber 15 through the sealing passage 26 together with the opening of the damper 24, and the food Cools and the temperature drops.
[0031]
In particular, the cold air that circulates in the cooking chamber 15 through the inside of the storage container 18 and the outer peripheral circulation flow path of the storage container 18 by the operation of the blower 28 contacts the surface of the food evenly and dissipates heat from the entire contact surface. At the same time, heat is exchanged with the heat transfer plate 32, and the heat transfer plate 32 rapidly cools from the bottom of the food. For this reason, the heat release (cooling) from the entire surroundings is accelerated, and the food can be rapidly frozen in a state with little temperature unevenness.
[0032]
Here, the freezing temperature in the cooking cabinet 15 is controlled by the set temperature T1 of the chamber temperature sensor 38. In the first embodiment of the present invention, since the set temperature T1 is set to minus 18 ° C., the internal temperature is controlled to be minus 18 ° C. by opening / closing the damper 27 by opening the damper 27 as the cooling means 19.
[0033]
The refrigeration operation time M1 is set and corrected by the external signal transmission means 37. That is, if the outside air temperature detected by the outside air temperature sensor 39 is in the range of 15 ° C. to 25 ° C., 8 hours is selected as the basic mode, 6 hours if it is 15 ° C. or less, and 10 hours if it is 25 ° C. or more. Is selected.
[0034]
Next, correction is performed by detecting the cooling speed as a signal of the internal temperature sensor 38. That is, the time from 1 ° C to minus 5 ° C is measured, and if it is 40 minutes, the refrigeration operation time set from the outside air temperature is set, and the increase / decrease of 0.2 hours is increased with respect to the increase / decrease of 1 minute of the required time. It is corrected. For example, if the outdoor air temperature is 20 ° C and the elapsed time from 1 ° C to -5 ° C is 45 minutes, the basic mode of 8 hours is multiplied by 0.2 hours and 5 minutes, and the freezing operation time and the thawing operation time are 1 hour. And 9 hours.
[0035]
Furthermore, the freezing time is corrected by the signal from the door switch 41. In other words, the refrigeration operation time is lengthened by the frequency of opening and closing, and the refrigeration operation time M1 is corrected by obtaining a correction value with a correction coefficient for each opening and closing frequency of the door 16 obtained from a preliminary experiment. In this embodiment, the opening / closing door 16c in the cooking chamber is opened and closed once, the freezing time is extended by 10 minutes, and the freezing time is extended by 2 minutes per opening / closing door 16d of the freezing chamber 14. A correction value for extending the freezing time of 1 minute per opening / closing of the open / close doors 16a and 16b of the refrigerator compartment 12 and the vegetable compartment 13 was input.
[0036]
In other words, if the door is frequently opened and closed in the daytime, etc., the freezing time becomes longer, so that the freezing process freezes the moisture in the cellular tissue of the food and the phenomenon of cell destruction due to volume expansion is made constant. It stabilizes the finished state of the frozen state.
[0037]
The correction by the external signal generating means 37 of the door switch 41 is limited to the refrigeration operation time M1, the thawing operation time M2 has little influence, and there is no need for correction based on the opening / closing frequency of the door.
[0038]
When the refrigeration operation time M1 set and corrected by the timer A elapses, the thawing process is started. Thaw
In the process, the timer B is driven, and the thawing operation time M <b> 2 corrected by detecting the downward tendency of the internal temperature with the external temperature sensor 39 and the internal temperature sensor 38 is displayed on the display panel of the display means 43. The display is a display that informs the remaining time until cooking is completed in a countdown manner.
[0039]
When the damper 27 is closed, the supply of cold air from the ventilation path 26 is stopped, the heater plate 34 as the heating means 33 is energized, and the inside of the cooking chamber 15 starts to be heated by the heat generated by the heater plate 34. In particular, the airflow around the storage container 18 that is transmitted to the high heat transfer plate 32 of aluminum plate in the storage container 18 in the vicinity and transmitted to the food, while being circulated by the blower 28 is the heater plate whose temperature has increased. Since the surface 34 and the heat transfer plate 32 are brought into contact with each other and the temperature is raised, and this heats the upper and side surfaces of the food, the food is heated uniformly from the entire periphery, and partially overheated or frozen. A mixed situation is avoided and the time required for thawing is shortened.
[0040]
The food thawed in this way is softened while the moisture in the cell tissue flows out from the portion where the cells are destroyed during the freezing operation time in the freezing step, and a predetermined cooking state is ensured.
[0041]
For example, if the food is a raw vegetable that has been cut from radish, Chinese cabbage, cabbage, carrots, onions, cucumbers, etc. It is in a state where dehydration and softening have occurred.
[0042]
Moreover, when there is a seasoning material around the raw vegetables, the seasoning material is infiltrated into the inside of the vegetable, which is a pretreatment state in which the cooking time can be shortened.
[0043]
In addition, when the food is meat and there is a seasoning material around the cut raw meat, the meat is softened and the seasoning penetrates into the meat.
[0044]
Also, if the food is a dairy product such as yogurt or fresh cream, they are in a state where the water and solids are separated, which makes the yogurt a fresh cheese-like dessert and fresh cream a little agitated. It is a processing state that can be easily processed into handmade butter.
[0045]
When the food stored in the storage container 18 at this time is a raw vegetable cut from radish, Chinese cabbage, cabbage, etc., conventionally, when the outside air temperature changes or the storage amount is large, the frozen state is uneven. When the finished product is thawed, a transparent part and a white part are mottled, resulting in an incomplete cooking state. Also, the temperature unevenness at the time of thawing includes a part that causes partial thermal transformation and a part that remains frozen. However, by appropriately adjusting the freezing operation time M1 and the thawing operation time M2 with the external signal transmission means 37 as described above, a uniform frozen state of the food can be secured, and the whole food is uniform and good. Can be cooked to the state.
[0046]
In the first embodiment, the external signal transmitting means 37 is a refrigeration equipped with all door switches 41 for detecting the outside temperature sensor 39, the inside temperature lowering tendency by the inside temperature sensor 38, and the opening / closing frequency of the open / close door 16. Although the refrigerator 11 has been introduced, there is no problem even if each external signal transmission means 39 is used alone, and the use of a plurality of them is not limited.
[0047]
Moreover, although the door switch 41 is mounted in all of the refrigerator compartment 12, the vegetable compartment 13, the freezer compartment 14, and the cooking compartment 15, it is quite acceptable as an external signal transmission means 37 with the door switch 41 of only one of the rooms. It is not intended to limit the use of multiple items.
[0048]
The type and amount of food to be stored in the storage container 18 are set with the setting buttons, and accordingly
Although a method of inputting the freezing operation time and the thawing operation time is also conceivable, in the first embodiment, in order to eliminate the troublesome setting, only one start button is set by appropriately setting the freezing temperature and the thawing temperature. It is set so that it can be done consistently from the start to the end of cooking, and it is a simple and clear freezer refrigerator with a freezing and thawing cooking function.
[0049]
Further, the constant value cooling operation after completion of the thawing process was set to 0 ° C. The constant temperature cooling operation after the thawing step is desired to be as low as possible without freezing from the viewpoint of storage stability. Minus 1 ° C. to 10 ° C. is appropriate, the temperature can be stabilized by the information from the external signal transmitting means 39, and storage at a lower temperature is possible.
[0050]
(Embodiment 2)
A second embodiment of the present invention will be described. The basic configuration and operation of the present embodiment are the same as those of the first embodiment, but the sensing method for reliably measuring the food load with a weight sensor is different. Therefore, the present embodiment will be described focusing on this difference.
[0051]
FIG. 5 is an enlarged vertical cross-sectional view of a main part in Embodiment 2 of the refrigerator-freezer of the present invention. In FIG. 5, a weight sensor 47 made of a piezoelectric element is installed on the surface of the bottom heat insulating wall 17 of the cooking chamber 15 as the external signal transmitting means 39. The upper part of the weight sensor is configured such that when the storage container 18 is inserted into the cooking chamber 15, the outer bottom surface of the storage container 18 rides on the protrusion of the weight sensor 47. It is installed in a detachable state on a sliding guide 48 that is integrally fixed to the drawer-type opening / closing door 16c, and the weight of the storage container 18 is positioned on the weight sensor 47 and can be measured by riding it. ing.
[0052]
Note that the weight sensor 47 is subtracted in advance from the weight of the storage container 18 and is zero-adjusted, and only the amount of food that enters the storage container 18 is measured.
[0053]
In Embodiment 2 of the present invention, the food weight is basically 1 kg, and the freezing operation time M1 is determined. However, if the weight sensor detects 1 kg and the difference is Mg, the coefficient of 0.004 is set to Mg. Is calculated by the temperature control means so as to adjust the refrigeration operation time and the thawing operation time by the time of the value calculated by multiplying by.
[0054]
Next, the operation and action of the second embodiment will be described with reference to the flowchart of FIG.
[0055]
First, food is placed in the storage container 18. In order to accurately measure the weight of the food, it is preferable to store the food in a freezing pack or a polyethylene bag that is commercially available without putting it in a glass or metal container. When the storage container 18 is inserted into the cooking chamber 15, the storage container 18 is detachably installed on a sliding guide 48 that is integrally fixed to the drawer-type opening / closing door 16 c of the cooking chamber 15. It sits on top of 47 and weighs.
[0056]
Hereinafter, although it operates similarly to Embodiment 1, the correction method of the freezing operation time M1 is based on the food weight of 1 kg, the freezing operation time M1 is determined, and the detection of the weight sensor is different from 1 kg. The freezing operation time and the thawing operation time are corrected in proportion. For example, when 1.2 kg of food is to be processed, the correction works to extend the 0.8 hour freezing operation time and the thawing operation time multiplied by a coefficient of 0.004 and 200 g.
[0057]
If the method for correcting the freeze-thaw cooking time according to the second embodiment of the present invention directly measures the weight of the food, the load amount of the food can be correctly and automatically confirmed. Correction can be made easily and quickly, and the state of the food by freezing can be maintained more stably.
[0058]
(Embodiment 3)
Embodiment 3 of the present invention will be described. The basic configuration and operation of the present embodiment are the same as those of the first embodiment, but the sensing method for checking the freezing time and the thawing time of the food with a freezing sensor is different. Therefore, the present embodiment will be described focusing on this difference.
[0059]
FIG. 7 is an enlarged vertical cross-sectional view of a main part in Embodiment 3 of the refrigerator-freezer of the present invention. In FIG. 7, as an external signal transmitting means 39, a freezing sensor 49 composed of a pyroelectric sensor is installed on the bottom heat insulating wall 17 surface of the cooking chamber 15. When the storage container 18 is inserted into the cooking chamber 15, a part of the heat transfer plate 32 made of a highly conductive material such as an aluminum material installed on the bottom surface of the storage container 18 is positioned above the freeze sensor 49. The infrared ray from 49 is blocked, and the surface temperature of the heat transfer plate 32 can be measured.
[0060]
In the third embodiment, a small through hole 50 is provided at the bottom of the storage container so that a part of the heat transfer plate 32 is directly irradiated with infrared rays from the freezing sensor 49.
[0061]
An experiment was conducted to determine whether the measurement of a part of the heat transfer plate 32 can infer the temperature of the food and verify the freezing point or the melting point. FIG. 8 shows a temperature variation graph of the heat transfer plate 32 by the freezing sensor 49 in the freezing step and the thawing step.
[0062]
In the freezing process of FIG. 8, A is a graph obtained by measuring the temperature fluctuation of the heat transfer plate by refrigeration operation of 0.75 kg of food, B is a temperature fluctuation graph of the heat transfer plate of 1 kg, and C is 1.25 kg. . That is, since the freezing completion point becomes longer in proportion to the load of the foodstuff, it was determined that the freezing completion point of the food can be known by measuring a part of the heat transfer plate 32 with the freezing sensor 49. Similarly, in the temperature fluctuation graph in the thawing step, since the inflection point at the completion of melting is clear depending on the amount of processing, it was determined that the completion of melting can be known by this method.
[0063]
The reason for this is that food contains a lot of water and has a very large latent heat at 0 ° C., so the holding time near 0 ° C. is long, and the temperature fluctuates rapidly when the food is completely frozen and thawed. For this purpose, a curve having a clear inflection point is drawn. Therefore, it was concluded that the end of freezing and the end of thawing of food can be inferred by measuring the end of the heat transfer plate 32 indirectly.
[0064]
Therefore, in the freezing process, the temperature control means is configured so that the point at which the temperature of the freezing sensor 49 is minus 10 ° C. is the freezing completion temperature T3, and the freezing operation time is completed when the freezing temperature is below T3. Further, the melting control temperature T4 was set to 5 ° C., and the temperature control means was configured so as to complete the thawing operation time when the temperature rose to T4 or higher.
[0065]
Next, the operation and action of the third embodiment will be described with reference to the flowchart of FIG.
[0066]
First, food is placed in the storage container 18. In order to correctly measure the temperature of the food, it is preferable to store the food in a freezing pack or a polyethylene bag that is commercially available without putting it in a glass container. The storage container 18 is inserted into the cooking chamber 15 and the start button 42 is pushed to start freeze-thaw cooking.
[0067]
Although the following operations are the same as those in the first embodiment and are omitted, the method for detecting the completion of the refrigeration process is a direct method using the freezing sensor 49 of the external signal transmitting means 39, and the heat transfer measured by the freezing sensor 49. If it detects that the temperature of the board 32 became T3 or less, it will consider that a freezing process is completed and will progress to a thawing | decompression process. In the third embodiment, the temperature T3 for determining that the freezing is completed is set to minus 10 ° C.
[0068]
Next, the thawing process is entered. When the temperature of the heat transfer plate becomes T4 or higher by the freezing sensor 49 by the external signal transmitting means 36, the thawing process is completed, and the constant-value cooling operation after the thawing process is completed is 0 ° C. The constant temperature cooling operation after the thawing process is desired to be as low as possible without freezing from the viewpoint of storage stability, but minus 1 ° C to 10 ° C is appropriate, and if the freezing sensor 49 is used well, it will be near the freezing point. Storage is easy.
[0069]
Since the external signal transmission means 39 using the freezing sensor 49 can know the freezing point and the melting point of the food, there is no need for correction of the outside air temperature, correction by the door opening / closing frequency, or correction by the amount of food. The freezing and thawing cooking can be reliably performed with simple sensing.
[0070]
The countdown timing is easily solved by empirically determining the relationship between the freezing operation time and the thawing operation time, estimating the completion of the melting processing time by calculating backwards when the freezing operation time is completed, and displaying the remaining time. it can.
[0071]
【The invention's effect】
As described above, the refrigerator-freezer of the present invention detects the cooling unit, the heating unit, and the internal temperature by placing the refrigerator compartment, the freezing compartment, the cooking compartment, the open / close door of each compartment, and the storage container. A cooking chamber equipped with a temperature sensor in the refrigerator and a door switch that detects opening and closing of each open / close door automatically sets the freezing operation time of the cooling means, and the food stored in the storage container is at least 1 in a frozen state and a thawed state. Temperature control means for performing freeze-thaw processing by changing the temperature more than once, and display means for notifying completion of the freeze-thaw treatment, and opening / closing doors of the cooking chamber, the refrigerator compartment and the freezer compartment In relation to the extended time of freezing operation time, From the extended time due to the opening and closing doors of the refrigerator compartment and freezer compartment, The extension time by the open / close door of the cooking chamber is extended, and the freezing time by the cooling means and the thawing time by the heating means are appropriately adjusted according to the usage conditions of the refrigerator-freezer, It is a stable and delicious finish of food.
[0072]
In addition, it has a door switch that detects the opening and closing of the door as an external signal transmission means. By shortening it, the result of freezing and thawing cooking of food is prevented from fluctuating due to the effect of door opening and closing.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view in a first embodiment of a refrigerator-freezer of the present invention.
FIG. 2 is an enlarged longitudinal sectional view of a main part of the refrigerator-freezer according to the embodiment.
FIG. 3 is a graph of temperature change depending on the load of the cooking chamber in the refrigerator-freezer of the embodiment.
FIG. 4 is a flowchart of temperature control means in the refrigerator-freezer of the embodiment.
FIG. 5 is an enlarged vertical sectional view showing a main part in a second embodiment of the refrigerator-freezer of the present invention.
FIG. 6 is a flowchart of temperature control means in the second embodiment of the refrigerator-freezer of the present invention.
FIG. 7 is an enlarged vertical sectional view of a main part in a third embodiment of the refrigerator-freezer of the present invention.
FIG. 8 is a flowchart of temperature control means in the refrigerator-freezer of the embodiment.
FIG. 9 is a graph showing the temperature variation of the heat transfer plate by the freeze sensor in the refrigerator-freezer of the same embodiment.
FIG. 10 is a longitudinal sectional view of an essential part of a conventional refrigerator.
[Explanation of symbols]
11 Freezer refrigerator
15 Cooking room
16 door
18 Storage container
19 Cooling means
32 Heat transfer plate
33 Heating means
36 Temperature control means
37 Outside air temperature sensor
38 Internal temperature sensor
39 External signal transmission means
41 Door switch
42 Start button
43 Display means
47 Weight sensor
49 Freezing sensor

Claims (1)

A refrigerator compartment, a freezer compartment, a cooking compartment, an open / close door of each compartment, a cooking compartment provided with a storage container and a cooling means, a heating means, and an internal temperature sensor for detecting the internal temperature, Temperature control means for automatically setting the freezing operation time of the cooling means by a door switch that detects opening and closing of the open / close door, and changing the food stored in the storage container to a frozen state or a thawed state at least once to perform freeze-thawing processing; the and display means for informing the completion of the freeze-thaw process, in relation to the extension time of the cooking chamber door and the refrigerating chamber and the freezing operation time per opening one door of the freezing chamber, the refrigerating chamber And the extended time by the opening / closing door of the said cooking chamber was made longer than the extended time by the opening / closing door of the freezer compartment .

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