JP5617305B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator capable of suppressing a temperature rise in a food storage case.

  In a conventional refrigerator, a freezer compartment and a vegetable compartment contain food storage cases that can be pulled out and put together with the door by opening and closing a dedicated door. Ice or frozen food is stored in the food storage case provided in the freezer compartment, and vegetables are stored in the food storage case provided in the vegetable compartment.

  Patent Document 1 is an example of a technical example in which the heat insulating property of the heat insulating door of the drawer device is improved in a refrigerator that pulls out and puts in a food storage case.

  Hereinafter, a conventional technique example will be described with reference to FIGS. FIG. 6 is cited from the prior art and is a side sectional view of the drawing device. The door 1 serving as the drawing device includes a front plate 2, an inner surface plate 3 formed by thermoforming the foamed multilayer resin sheet 5, foamed polyurethane filled in a space between the front plate 2 and the inner surface plate 3, and the like. It is comprised with the foam heat insulating material 4 which consists of. FIG. 5 is a cross-sectional view of the foamed multilayer resin sheet 5. The foamed multilayer cross-sectional sheet 5 has resin films 7 a and 7 b laminated on the upper and lower surfaces of the foamed layer 6. The door 1 is provided with a foam layer 6 in addition to the foam heat insulating material 4, thereby improving the heat insulation of a drawer device such as a refrigerator.

JP 2000-258045 A

  However, in the above-described conventional technology, the heat insulation of the refrigerator door, that is, the front surface portion is enhanced, and no consideration is given to the case where the door is opened and the food storage case goes out.

  In a refrigerator that pulls out and puts in a food storage case, when the door is opened, the entire food storage case such as the top surface, bottom surface outside and side surface outside of the food storage case is directly exposed to the outside air. The temperature of the food stored inside through the case itself and the food storage case rises, and the temperature of the food in the food storage case increases due to the inflow of outside air as the door opens.

  In a general refrigerator, the heat insulating box of the refrigerator is filled with a heat insulating material between the outer box and the inner box, and the cross-sectional structure of the heat insulating box is a three-layer structure, and has a structure that enhances heat insulating properties. On the other hand, the food storage case has a plastic single-layer structure and does not have a structure and a function for improving heat insulation.

  Therefore, the conventional refrigerator has a problem that when the door is opened, the temperature in the food storage case rises and the heat load in the refrigerator increases. Especially in the freezer compartment where the difference from the outside temperature is large, the temperature inside the room and the food storage case is cooled to around -20 ° C, but the temperature may rise to -10 ° C when the door is opened. . At this time, the surface temperature of the frozen food in the food storage case rises, and even at a temperature of −10 ° C., the surface of the food, for example, ice cream melts.

  An object of the present invention is to provide a refrigerator that solves the above problems and reduces the heat load in the refrigerator by suppressing the temperature rise in the food storage case with a simple structure.

In order to solve the above-mentioned conventional problems, the refrigerator of the present invention is a refrigerator provided with a drawer-type food storage case, wherein the food storage case is a food storage case having an opening on an upper surface integrally formed of resin. The cross-sectional structure of the surface constituting the side surface portion or bottom surface portion of the food storage case has a skin layer on the outermost surface portion and a porous structure in the inner layer portion adjacent to the surface portion. The food storage case is formed by injection foaming, chemical foaming using a pyrolytic chemical foaming agent, and contains at least one kind of nucleating agent or additive so that it is independent of the inner layer of the food storage case. A porous body structure containing bubbles is formed .

  As a result, the food storage case has a porous structure, and thus has a large number of pores containing gas in the inner layer, the thermal conductivity is reduced, the heat insulation is improved, and the food storage case goes out by opening the door. In this case, the temperature rise of the food storage case itself and the food storage case via the food case can be suppressed, and the temperature increase of the stored food can be suppressed low. Accordingly, it is possible to suppress a decrease in food quality that occurs when the door is opened and closed, and it is possible to improve the freshness of the food. And since the temperature rise of a foodstuff can be suppressed low, time can be shortened before cooling to predetermined temperature also in the cooling after closing a door, and an energy saving refrigerator can be implement | achieved.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator which improved the freshness of food and implement | achieved energy saving can be provided.

Side surface sectional drawing of the refrigerator of Embodiment 1. Main part side surface sectional drawing of the refrigerator of Embodiment 1 Comparison diagram of temperature rise in food storage case when door of food storage case according to embodiment 1 and conventional food storage case is opened Side surface sectional view of the refrigerator of the second embodiment Side surface sectional drawing of the principal part of the refrigerator of Embodiment 3. Side sectional view of a door which is a drawer device such as a conventional refrigerator Sectional drawing of the foam multilayer heat insulation sheet which comprises the inner surface board in FIG.

1st invention is the refrigerator which provided the drawer-type food storage case, The said food storage case is a food storage case which has an opening part in the upper surface integrally molded with resin, Comprising: The side part or the said food storage case cross-sectional structure of the surface constituting the bottom portion, the outermost and has a skin layer on the surface portion comprising, in those that have a porous structure in the inner layer portion adjacent to said surface portion, said food storage case injection foaming And formed by chemical foaming using a pyrolytic chemical foaming agent, and by containing one or more kinds of nucleating agents or additives, a porous structure containing closed cells was formed in the inner layer of the food storage case. It is a refrigerator.

As a result, when the food storage case has a porous structure, it has a large number of pores containing gas in the inner layer, the thermal conductivity is reduced and the heat insulation is improved, and the food storage case goes out by opening the door The temperature rise in the food storage case itself and the food storage case via the food case can be suppressed, and the temperature increase of the stored food can be suppressed low. Moreover, the fall of the food quality which arises when opening and closing a door can be suppressed, and it becomes possible to improve the freshness of food.
As described above, since the temperature rise of the food and the food storage case can be kept low, even after cooling after the door is closed, the time can be shortened until the temperature is lowered to the predetermined temperature, and an energy saving refrigerator can be realized. it can.

According to a second invention, in the first invention, the food storage case has a heat insulating property by providing the food storage case in the freezer compartment, and the food storage case is opened when the freezer compartment door is opened. In addition to being able to suppress the temperature rise of frozen food, since the food storage container is provided in the freezing chamber where the temperature difference with the outside air is most likely to be affected by the outside air, the temperature rise of the frozen food can be suppressed, The energy burden for cooling the temperature of the frozen food and the freezer compartment to the temperature before opening the door is reduced, and there is also an energy saving effect.

The third invention is the refrigerator according to the first or second invention , wherein a cold storage material is attached to the food storage case. Therefore, when the food storage case goes out by opening the door, the low temperature of the food storage case is maintained by the cold storage material. As a result, the temperature rise of the stored food can be suppressed, and the heat load of the input food and the inflowing outside air is absorbed and cooled by the cold storage material, so that the food can be cooled in a short time. Since the food storage case has a porous structure, it has a low thermal conductivity and heat insulation, and by attaching a cold storage material to the food storage case, the temperature inside the food storage case due to outside air when the door is opened and closed The effect of suppressing the increase is further increased.

According to a fourth invention, there is provided a fixing means for fixing the cold storage material in the third invention , wherein the fixing means is a fixing means integrally formed of resin, and the cross-sectional structure of the fixing means has a skin on the surface portion. It is a refrigerator which has a layer and has a porous body structure in the inner layer part adjacent to the surface part. As a result, when the food storage case goes out due to the opening of the door, the low temperature inside the food storage case is maintained by the cold storage material, and the temperature rise of the stored food can be suppressed. Since the heat load is absorbed by the cold storage material and cooled, the food can be cooled in a short time. Furthermore, even if the door is opened and closed randomly or frequently, or even when the door is opened and closed at a relatively high speed, the cold storage material does not move in the food storage case, so the food heat is stored in the cold storage. The heat is absorbed by the material, and it is possible to suppress the temperature rise of stored food and shorten the cooling time at the time of food addition. Further, the fixing means has a heat insulating property due to the porous structure, and the fixing surface of the cold storage material fixed by the fixing means is in contact with the fixing means having the heat insulating property, so the fixing surface The inflow of heat from can be suppressed, and the temperature rise of the cold storage material can be suppressed when the door is opened. As a result, the effect of suppressing the temperature rise of the stored food is further increased, and the energy burden for cooling the cold storage material to the temperature before opening the door and the energy burden for keeping the cold storage material at a low temperature are also increased. It becomes smaller and has the effect of energy saving.

According to a fifth invention, in the third invention , there is provided a fixing means for fixing the cold storage material, the fixing means is a fixing means integrally formed of resin, and the cross-sectional structure of the fixing means includes a surface portion and a surface. It is a refrigerator which consists of an inner layer part adjacent to the part, and the density of the inner layer part is smaller than the density of the surface part. As a result, the temperature rise of the food and the cooling time for charging the food can be reduced as in the fifth aspect of the invention, and the inner layer portion having a small density of the fixing means has a large number of pores containing gas and has heat insulation properties. Since the fixing surface of the cold storage material fixed by the fixing means is in contact with the fixing means having heat insulation, it is possible to suppress the inflow of heat from the fixing surface, and the cold storage when the door is opened. It becomes possible to suppress the temperature rise of the material. As a result, the effect of suppressing the temperature rise of the stored food is further increased, and the energy burden for cooling the cold storage material to the temperature before opening the door and the energy burden for keeping the cold storage material at a low temperature are also increased. Smaller and more energy efficient.

A sixth invention is the refrigerator according to the fourth or fifth invention , wherein the fixing means is a refrigerator constituted by a part of the components of the food storage case, and the fixing means is realized by a simple configuration, and is separately provided. It is possible to provide a fixing means having increased rigidity as compared with that formed by the above.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a side sectional view of the refrigerator in the first embodiment of the present invention, FIG. 2 is a side sectional view of the main part of the refrigerator in the first embodiment of the present invention, and FIG. 3 is the present embodiment. It is a comparison figure of the temperature rise in a food storage case when the food storage case by 1 and the door of the conventional food storage case are opened.

  The inside of the heat insulation box 20 is partitioned into a refrigerator compartment 23, a freezer compartment 24, and a vegetable compartment 25 by heat insulation partitions 21 and 22, and dedicated doors 26, 27, and 28 are provided on the front surfaces of the respective storage compartments. The room is provided with a rotary door 26 pivoted on one side by a hinge or the like (not shown), drawer doors 27 and 28 in the freezer compartment, and drawer door 29 in the vegetable compartment.

  The refrigerated room 23 is set to a refrigerated temperature zone that is a temperature that does not freeze for refrigerated storage, and is normally held at 1 ° C. to 5 ° C. It is kept at a set vegetable temperature range of 2 ° C to 7 ° C. The freezer compartment 24 is set in a freezing temperature zone, and is usually set at −22 ° C. to −15 ° C. for frozen storage, but for example, −30 ° C. or −25 ° C. to improve the frozen storage state. May be set and held at a low temperature.

  The freezer compartment 24 includes a food storage case 30 that is pulled out by opening and closing the upper door 27 and a food storage case 31 that is pulled out by opening and closing the lower door 28, and the vegetable compartment 25 includes a food storage case 32. The cases 30, 31, and 32 are attached to the doors 27, 28, and 29 via attachment frames (not shown) to the doors 27, 28, and 29. If the doors 27, 28, and 29 are pulled out, the food storage case. 30, 31, 32 are also structured to be pulled out together with the door.

  The food storage case 31 is an integrally formed food storage case having an opening on the upper surface, and the cross-sectional structure of the side surface and the bottom surface of the food storage case 31 has skin layers 40a and 40b on the surface. The inner layer portion 42 adjacent to the surface portion has a porous structure. As described above, the three-layer structure including the outer surface skin layer 40a, the porous inner layer portion 41, and the inner surface skin layer 40b reduces the thermal conductivity of the food storage case 31 as compared with the conventional case. The heat insulation of the food storage case 31 can be improved. When the freezer compartment 24 is opened and the food storage case 31 goes out, in addition to the outside air flowing in from the upper surface opening of the food storage case 31, all the surface portions of the side surface portion and the bottom surface portion are exposed to the outside air. This temperature rise can be suppressed by providing the food storage case 31 in the freezer compartment 24.

  Here, the example of the food storage case 31 for storing the frozen food in the freezer compartment 24 has been described, but the food storage case 30 and the vegetable compartment 25 provided in the freezer compartment 24 may be used without being limited thereto. The storage room may be provided with a rotary door that is not a drawer-type door. For example, a box case may be provided in the refrigerator compartment 23 or the like to cool the inside of the case.

Further, in the cross section of the food storage case, a three-layer structure including an outer surface skin layer, an inner layer portion of a porous body structure, and an inner surface portion skin layer, for example, the cross section is a plastic double structure. Compared with a structure in which the inside of the interior is empty, it can have a high strength.

  Below, an example of the manufacturing method of the food storage case of this invention is demonstrated.

  The food storage case 31 is injection foam molding of resin such as polypropylene, and is formed by chemical foam molding using a thermal decomposition type chemical foaming agent, and includes one or more nucleating agents or additives such as talc. By including the nucleating agent, it is possible to form a porous structure containing a large number of uniform and fine closed cells in the inner layer on the surface of the food storage case 31, and to further improve the heat insulation.

  Furthermore, in chemical foam molding, it is not necessary to newly introduce special molding equipment, so that it is possible to reduce the manufacturing cost and easily manufacture an integrally molded product having a porous structure. Examples of the pyrolytic chemical foaming agent include organic foaming agents such as azodicarbonamide or inorganic foaming agents such as sodium hydrogen carbonate (bicarbonate), but the food storage case is in direct contact with food. It is preferable to use sodium hydrogen carbonate, which is tasteless, odorless, the decomposition products are carbon dioxide and water, and the decomposition residue is also harmless.

  Moreover, the food storage case 31 is injection foam molding such as polypropylene, and can be molded by physical foam molding using a supercritical fluid.

  The food storage case 31 is formed by injection foam molding of the core back method or the short shot method. In the core back method, the molding material containing a resin and a foaming agent is filled in the mold, and then the mold is moved to expand the volume and expand and foam the resin. Therefore, the heat insulation of the food storage case 31 can be improved. Furthermore, it is possible to reduce the amount of resin filled in the mold as compared with the conventional case, and there is also an effect of weight reduction.

  The short shot method is a method of filling a molding material containing a resin and a foaming agent while leaving an unfilled portion in a mold, and filling the unfilled portion by an expansion force due to foaming of the foaming agent. The short shot method can be carried out with conventional molding equipment, and the amount of molding material can be reduced as compared with the conventional one, so that there are also effects of weight reduction and cost reduction.

  FIG. 3 is a comparison diagram of the temperature rise in the food storage case when the door is opened between the food storage case 31 according to the present embodiment and the conventional food storage case.

  The food storage case 31 is formed by adding a foaming agent and an additive to polypropylene and injection-molding by a core back method. The thickness of the bottom portion of the food storage case 31 is 3 as compared with the conventional food storage case. It is twice as thick. When a simulated load equivalent to food is placed in the food storage case 31 disposed in the freezer compartment, the door is opened, and the food storage case 31 is fully opened, the bottom portion of the bottom portion that is in contact with the simulated load of the food storage case 31 It shows the temperature change. The standard time required for the user to open and close the door is 20 seconds. When comparing the temperature 20 seconds after the door is opened, the food storage case 31 of the present invention has a temperature of −19.7 ° C. The rise is limited to 0.6 ° C (-20.3 ° C before the door is opened).

  In the conventional food storage case, it is -17.5 ° C, and the temperature rise is 2.8 ° C (-20.3 ° C before the door is opened). Thus, the refrigerator of this embodiment provided with the food storage case 31 suppresses the heat intrusion from the bottom surface and the side surface when the food storage case 31 goes out to the outside air, and increases the temperature of the food in the food storage case 31. It turned out that it can suppress.

Moreover, the refrigerator needs to maintain the cooling performance by melting the frost attached to the surface of the cooler 33 provided behind the freezer compartment by the heater 34. During this defrosting operation, the air heated by the heater 34 melts the frost adhering to the cooler 33, and the warm air after melting the frost raises the temperature of the freezer room at around -20 ° C to around -15 ° C. There is a case to let you. As shown in FIG. 3, the food storage case 31 of the present invention has improved heat insulation compared to the conventional food storage case, and has an effect of suppressing a temperature rise during the defrosting operation. Therefore, during the defrosting operation, the surface temperature of the frozen food in the food storage case rises, and the deterioration of the food quality such as the frozen food surface melting can be prevented.

(Embodiment 2)
FIG. 4 is a side sectional view of the refrigerator in the second embodiment of the present invention.

  Hereinafter, although operation | movement and an effect | action are demonstrated about the refrigerator in Embodiment 2 of this invention, about the same structure as Embodiment 1, the same code | symbol is attached | subjected and the detailed description is abbreviate | omitted.

  As shown in FIG. 4, the cold storage material 100 that is a cold storage member having a cold storage function is a door at the inner bottom portion of the food storage case 30 that is located in the upper stage constituted by two stages of the freezer compartment 24 that is a drawer-type storage room. 27, which is placed in a recessed portion that functions as a fixing means for fixing the cold storage material provided on the 27 side, and occurs when the food storage case 30 moves at a relatively fast speed in the front-rear direction when the door 27 is opened and closed. Due to the inertia, the food storage case 30 is not easily moved backward. That is, in the food storage case 30 of the freezer compartment 24 provided with the cool storage material 100, the front side section located on the door 27 side is used as a storage area including the cool storage material 100, and the section located on the back side. Can be used properly as a storage unit which is a general refrigeration region in which the regenerator material 100 is not provided.

  Similar to the food storage case 31 described in the first embodiment, the food storage case 30 is a food storage case having an opening on an integrally formed upper surface, and constitutes a side surface portion and a bottom surface portion of the food storage case 30. The cross-sectional structure of the surface has a skin layer on the surface portion and a porous structure in the inner layer portion adjacent to the surface portion. Thereby, the heat conductivity of the food storage case 30 is smaller than the conventional one, and the heat insulation of the food storage case 30 can be enhanced.

  In the present embodiment, the example in which the cold storage material is provided in the food storage case 30 located in the upper stage constituted by the two stages of the freezing room 24 that is a drawer-type storage room has been described. For example, the food storage case 31 provided in the freezer compartment 24 may be used.

  The latent heat of the regenerator material 100 is desirably lower than the freezing temperature of a general frozen food and lower than the temperature of the maximum ice crystal formation zone. When the freezing point temperature of the regenerator material 100 is set in this manner, It becomes possible to maximize the cooling speed when the is mounted.

  The food stored in the food storage case 30 provided with the cold storage material 100 is the frozen food 101 that has already been stored and the input food 102 that is newly input onto the cold storage material 100.

  About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below.

  The cold storage material 100 and the frozen food 101 are cooled to -20 ° C., which is a predetermined temperature in the freezer compartment 24, and frozen. When the door 27 is opened and the input food 102 is placed on the upper surface of the regenerator material 100, the input food 102 is deprived of heat by the regenerator material 100 frozen at −20 ° C. immediately after the input, and cooling is started. Furthermore, the outside air that has flowed into the food storage case 30 is also cooled by opening the door when the food is input, and the air in the food storage case 30 is kept at a lower temperature than before, and the input food 102 is also cooled by the low-temperature air. The Since the food storage case 30 has a porous structure and is better in heat insulation than the conventional food storage case, the air in the food storage case 30 is kept at a lower temperature, and the low temperature air causes the input food 102 to flow. It is possible to effectively cool and shorten the cooling time.

  In addition, when the door 27 is opened and there is the frozen food 101 that has been previously stored in the compartment on the back side adjacent to the cold storage material 100, the cold storage material 100 cools the outside air flowing into the food storage case 30, The periphery of the frozen food 101 is kept at a lower temperature than in the past. Furthermore, even when the input food 102 having a relatively high temperature is in the same food storage case 30, the temperature rise due to the heat interference from the input food 102 is also suppressed as compared with the conventional case.

  Thus, in the food storage case of the freezer compartment 24 provided with the cold storage material 100, the front side section located on the door 27 side is used as a storage area provided with the cold storage material 100 and located on the back side. The section can be used as a storage unit, which is a general freezing area in which the regenerator material 100 is not provided, so that an area for storing the input food when a warm food is input for the user is also provided. It becomes clearer and the thermal effect on the frozen food 101 stored in advance from the input food 102 can be reduced.

  After that, when the door 27 is closed, it is determined that the door 27 is closed by a detection means (not shown), and the operation of the refrigeration cycle (not shown) is started. When the refrigerant flows through the cooler 33 and cold air is generated. At the same time, cooling is started by operating the blower 35 and circulating cool air. Cold air is supplied to the freezer compartment from a freezer outlet (not shown), and cools the frozen food 101 and the input food 102. At this time, the frozen food 101 is cooled by both the indirect cooling by the cold air that flows through the surroundings and the direct cooling from the cool storage material 100 on the lower surface.

  As described above, when the food storage case 30 goes out when the door 27 is opened, the temperature rise of the frozen food 101 stored in the food storage case 30 cooled by the cold storage material 100 can be suppressed and the food storage case 30 is charged. The cooling time of the input food 102 can be shortened.

  Since the food storage case 30 has a porous structure, it has a low thermal conductivity and a heat insulating property. By providing the cold storage material 100 in the food storage case 30, the heat insulation effect of the food storage case 30 and the effect of the cold storage material 100 are combined, and the food storage case 30 is kept at a lower temperature than before, and the frozen food 101 rises. The effect of temperature suppression is great, and the cooling time of the input food 102 can be shortened.

  Therefore, even when the door 27 is opened, that is, when the food storage case 30 goes out and is exposed to the outside air, the food storage case 30 having heat insulating properties suppresses the inflow of outside air and reduces the heat load caused by the inflow of outside air. The heat storage due to inflow of outside air is absorbed by the cold storage material 100 provided in the food storage case 30 so that the food storage case 30 is kept at a lower temperature than before, and the temperature rise of the stored frozen food 101 is suppressed. And quality deterioration can be suppressed.

  Further, even when the food is put in, even before the door is closed, the inflow of outside air is suppressed by the food storage case 30 having heat insulating properties, and the heat load due to the inflow of outside air and the heat load of the input food 102 are absorbed by the cold storage material 100. As a result, the input food 102 is cooled and the inside of the food storage case 30 is kept at a lower temperature than in the prior art, so that the food can be cooled in a short time and the freshness can be improved. Accordingly, it is possible to provide a refrigerator with high freshness.

  Furthermore, by providing the cold storage material 100 in the food storage case 30 having heat insulation properties, it is possible to suppress the inflow of heat into the cold storage material 100 when the door 27 is opened and the food storage case 30 goes out. Become. As a result, the inside of the food storage case 30 is kept at a lower temperature than in the prior art, and the energy burden for cooling the cold storage material 100 to the temperature before the door 27 is opened is reduced.

Further, when the door 27 is closed, energy is also required to keep the cold storage material 100 at a low temperature. However, by providing the cold storage material 100 in the food storage case 30 having heat insulation properties, the energy burden is reduced and energy is saved. The effect is obtained.

(Embodiment 3)
FIG. 5 is a side cross-sectional view of the main part of the refrigerator according to Embodiment 3 of the present invention.

  Hereinafter, the operation and action of the refrigerator according to the third embodiment of the present invention will be described, but the same components as those of the first and second embodiments will be denoted by the same reference numerals and detailed description thereof will be omitted.

  The cold storage material 100 which is a cold storage member having a cold storage function is placed on the inner bottom portion, that is, the bottom surface side of the food storage case 30, and is provided on the door 27 side.

  Further, the fixing means 103 that suppresses the movement of the regenerator material 100 is a hollow portion, and the hollow portion is a part of a resin member that is a component of the food storage case 30 and is configured integrally with the food storage case 30. The fixing means 103 and the food storage case 30 are integrally formed of resin, and the cross-sectional structure of the fixing means 103 and the food storage case 30 has a skin layer on the surface portion and a porous structure in the inner layer portion adjacent to the surface portion. doing. Thereby, the heat conductivity of the fixing means 103 and the food storage case 30 is smaller than the conventional one, and the heat insulation of the fixing means 103 and the food storage case 30 can be enhanced.

  By making the fixing means 103 into a hollow portion, the bottom surface portion and the four side surfaces of the cold storage material 100, that is, all surfaces other than the food installation surface 104 are surrounded by the fixing means 103, and the cold storage material 100 fixed by the fixing means 103 is used. The fixing surface is in contact with fixing means 103 having heat insulation properties. Thereby, when the door 27 is opened and the food storage case 30 goes out, the cool storage material 100 suppresses the inflow of heat from the fixed surface of the bottom surface portion and the four side surfaces, and suppresses the temperature increase of the cool storage material 100. Is possible.

  Thereby, when the food storage case 30 goes out when the door 27 is opened, it is possible to suppress the inflow of heat from the outside air to the cold storage material 100 and to keep the inside of the food storage case 30 more effectively at a low temperature. Become. Therefore, the temperature rise of the frozen food 101 stored in the food storage case 30 can be effectively suppressed, and the input food 102 can be cooled in a short time.

  Moreover, by suppressing the temperature rise of the cool storage material 100, the energy burden for cooling the cool storage material 100 to the temperature before door opening becomes small, and there also exists an energy-saving effect. Furthermore, since all surfaces of the bottom surface portion and the four sides of the cold storage material 100 other than the food installation surface 104 are surrounded by the fixing means 103 having heat insulation properties, the cold storage material 100 is at a predetermined temperature in the freezer compartment 24. The energy burden for cooling to -20 degreeC and maintaining predetermined temperature becomes small, and the effect of energy saving is acquired.

  Further, the fixing means 103 that suppresses the movement of the regenerator material 100 is a hollow portion, and the hollow portion is formed integrally with the food storage case 30 by a part of a resin member that is a component of the food storage case 30. With a simple configuration, it is possible to increase the rigidity as compared with that formed separately.

In the present embodiment, the fixing means 103 is a recess, and the recess is a part of a resin member that is a component of the food storage case 30 and is configured integrally with the food storage case 30. However, for example, the fixing means 103 and the food storage case 30 may be formed as separate bodies without being limited thereto. Each of the fixing means 103 and the food storage case 30 is integrally formed of a resin, and the cross-sectional structure of each of the fixing means and the food storage case has a skin layer on the surface portion, and a porous structure in the inner layer portion adjacent to the surface portion These may be combined by welding or the like.

  Below, an example of the manufacturing method of a fixing means and a food storage case when a fixing means is comprised by a part of component of a food storage case is demonstrated.

  The fixing means and the food storage case are injection foam molding of a resin such as polypropylene, and are formed by chemical foam molding using a pyrolytic chemical foaming agent, and include one or more nucleating agents or additives such as talc. By including the nucleating agent, it is possible to form a porous body structure containing a large number of uniform and fine closed cells in the inner layer on the surface of the fixing means and the food storage case, and the heat insulation can be further improved. Furthermore, in chemical foam molding, it is not necessary to newly introduce special molding equipment, so that it is possible to reduce the manufacturing cost and easily manufacture an integrally molded product having a porous structure. Examples of the pyrolytic chemical foaming agent include organic foaming agents such as azodicarbonamide or inorganic foaming agents such as sodium hydrogen carbonate (bicarbonate), but the fixing means and the food storage case are directly connected to food. Since it contacts, it is preferable to use sodium hydrogencarbonate which is tasteless and odorless, the decomposition products are carbon dioxide and water, and the decomposition residue is also harmless. The fixing means is injection foam molding such as polypropylene, and can be molded by physical foam molding using a supercritical fluid.

  The fixing means and the food storage case are formed by injection foam molding of the core back method or the short shot method. In the core back method, the molding material containing a resin and a foaming agent is filled in the mold, and then the mold is moved to expand the volume and expand and foam the resin. Thus, the heat insulating properties of the fixing means and the food storage case can be enhanced. Furthermore, it is possible to reduce the amount of resin filled in the mold as compared with the conventional case, and there is also an effect of reducing the weight. The short shot method is a method of filling a molding material containing a resin and a foaming agent while leaving an unfilled portion in a mold, and filling the unfilled portion by an expansion force due to foaming of the foaming agent. The short shot method can be carried out with conventional molding equipment, and the amount of molding material can be reduced as compared with the conventional one.

  Even when the fixing means and the food storage case are formed separately, they can be manufactured by the same method as the manufacturing method of the fixing means described above.

  As described above, since the refrigerator according to the present invention can suppress the temperature rise in the food storage case, the refrigerator can be applied to a refrigerator provided with a box case for storing food.

24 Freezing room 31 Food storage case 40a, 40b Skin layer 41 Inner layer part

Claims (6)

In the refrigerator provided with the drawer-type food storage case, the food storage case is a food storage case integrally formed of resin and having an opening on the upper surface, and the surface constituting the side surface or the bottom surface of the food storage case the cross-sectional structure has a skin layer on the surface portion of the outermost, in which have a porous structure in the inner layer portion adjacent to said surface portion, said food storage case in injection foam molding, the thermally decomposable A refrigerator that is formed by chemical foaming using a chemical foaming agent and that includes one or more nucleating agents or additives to form a porous structure containing closed cells in the inner layer of the food storage case . The refrigerator according to claim 1 , wherein the food storage case is provided in a freezer compartment that is held in a freezing temperature zone. The refrigerator according to claim 1 or 2 , wherein a cold storage material is provided in the food storage case. A fixing means for fixing the cold storage material is provided, the fixing means is a fixing means integrally formed of resin, and the cross-sectional structure of the fixing means has a skin layer on the surface portion, and an inner layer portion adjacent to the surface portion. The refrigerator according to claim 3 , which has a porous structure. A fixing means for fixing the cold storage material is provided, and the fixing means is a fixing means integrally formed of a resin, and a cross-sectional structure of the fixing means is an outermost surface portion and an inner layer portion adjacent to the surface portion. The refrigerator according to claim 3 , wherein the density of the inner layer portion is smaller than the density of the surface portion. The refrigerator according to claim 4 or 5 , wherein the fixing means is configured integrally with the food storage case.

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