WO2018193662A1 - Thermal insulation housing and refrigerator - Google Patents

Abstract

A thermal insulation housing (110) is formed in a box shape and has: a region formed by an outer box (111), an inner box (112), and a hard urethane thermal insulation material (98) that fills the space between the outer box (111) and inner box (112); a region formed by an additive-agent-containing urethane thermal insulation material (97) that contains an additive agent and has thermal insulation performance superior to that of the hard urethane thermal insulation material (98); and a region in which a vacuum thermal insulation material (96) is disposed. The vacuum thermal insulation material (96) is disposed in a boundary region between the most cooled region and outside air, and the additive-agent-containing urethane thermal insulation material (97) is disposed around the vacuum thermal insulation material (96) so as to overlap part of the vacuum thermal insulation material (96).

Description

Insulated box and refrigerator

The present invention relates to a heat insulating box and a refrigerator including the heat insulating box.

From the viewpoint of protecting the global environment, various efforts have been made to save resources, save energy, and especially save power.

In the field of refrigerators, research has been conducted to realize energy saving by devising a heat insulating structure. For example, Patent Document 1 discloses a refrigerator including a heat insulation box composed of a hard urethane foam and a vacuum heat insulating material excellent in heat insulation.

Japanese Patent Laid-Open No. 10-205988

In the configuration disclosed in Patent Document 1, the vacuum heat insulating material is affixed to both sides and the back of the freezer compartment. For this reason, the coating area of a vacuum heat insulating material is large, and the usage-amount of a vacuum heat insulating material is large. Since the vacuum heat insulating material is more expensive than the hard urethane foam, there is a problem that the cost is higher than that of using the hard urethane foam. On the other hand, if the amount of vacuum heat insulating material used is reduced for cost reduction, there is a problem that the heat insulating performance deteriorates.

This invention is made | formed in view of the said actual condition, and has the high heat insulation performance, and aims at providing the low cost heat insulation box and a refrigerator using the same.

In order to achieve the above object, the heat insulating box of the present invention is formed in a box shape and has a region formed by the first urethane heat insulating material and a heat conductivity smaller than that of the first urethane heat insulating material. 2 and a region formed by the urethane heat insulating material.

The heat insulation box and refrigerator of this invention have the area | region formed with a 1st urethane heat insulating material, and the area | region formed with a 2nd urethane heat insulating material whose heat conductivity is smaller than a 1st urethane heat insulating material. . For this reason, according to this invention, high heat insulation performance can be obtained, suppressing cost.

The front view of the refrigerator which concerns on 1st Embodiment of this invention. Sectional view along line II-II of the refrigerator of FIG. Schematic of a cross section taken along line III-III of the refrigerator compartment of the refrigerator in FIG. Sectional drawing which extracts and shows the part comprised with an outer box, an inner box, and a hard urethane heat insulating material among the heat insulation boxes shown in FIG. Rear view of the part shown in FIG. 4A Schematic of the cross section which looked at the heat insulation box concerning a 2nd embodiment from the upper part Front view of the open / close door formed by the heat insulation box according to the second embodiment Sectional drawing which looked at the refrigerator which concerns on 3rd Embodiment from the side Schematic of a cross section taken along line III-III of the refrigerator compartment of the refrigerator in FIG. Schematic of the cross section of the refrigerator compartment of the refrigerator which concerns on 2nd Embodiment. Schematic of the cross section of the refrigerator compartment of the refrigerator which concerns on 2nd Embodiment. Schematic of the cross section of the refrigerator compartment of the refrigerator according to the fourth embodiment Schematic of the cross section of the refrigerator compartment of the refrigerator which concerns on 5th Embodiment

Hereinafter, a heat insulation box and a refrigerator according to preferred embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same reference numerals are given to the same configurations.

(First embodiment)
A refrigerator 10 according to this embodiment is shown in FIG. 1, and a sectional view taken along line II-II is shown in FIG. As shown in FIG. 2, the refrigerator 10 includes a heat insulating box 110 having a box shape. As shown in FIGS. 1 and 2, the refrigerator 10 includes a refrigerator compartment 20, an ice making chamber 30 and a switching chamber 40 disposed under the refrigerator compartment 20, and an ice making chamber 30 inside the heat insulating box 110. And a vegetable room 50 arranged under the switching room 40 and a freezing room 60 arranged in the lowermost layer. The refrigerator 10 also includes a machine room 70, a cooling room 80, a cold air passage 90, a switching room cold air passage 92, and a refrigerating room cold air passage 91 on the back surface of the heat insulating box 110.

The refrigerator compartment 20 is disposed on the uppermost stage of the heat insulating box 110 of the refrigerator 10. The refrigerator compartment 20 is a storage room having a storage product storage space for storing a storage product therein. This storage space is controlled to a refrigeration temperature range of + 3 ° C. to + 10 ° C. A plurality of shelves 26 for placing stored items are provided in the stored item storage space. Two sealed containers 29 are arranged in parallel on the left and right in the lower part of the stored item storage space in the refrigerator compartment 20. One of the containers 29 is used as a chilled room and the other as a vegetable room. The chilled room is controlled to a chilled temperature range of about + 3 ° C to -3 ° C, and the vegetable room is controlled to a vegetable room temperature range of about + 3 ° C to + 5 ° C.

A double door left door 21 and a right door 22 are provided at the front opening of the refrigerator compartment 20.

On the outer surface of the right door 22, an operation switch for setting the temperature and an operation panel 101 for displaying temperature information of the internal temperature and the set temperature are provided. Shelves 27 are arranged on the inner surface of the left door 21 and the inner surface of the right door 22, respectively.

The ice making room 30 and the switching room 40 are arranged side by side under the refrigeration room 20. In the ice making chamber 30, a draw-out type ice making container is arranged. The ice making chamber 30 produces ice. A drawer-type ice making chamber door 31 integrated with the ice making container is provided at the front opening of the ice making chamber 30.

The switching room 40 is a storage room in which the indoor temperature can be switched between a freezer compartment temperature zone and a vegetable compartment temperature zone in a plurality of stages. The user switches the temperature in the switching chamber 40 by operating the operation panel 101. The freezing temperature zone is, for example, −17 ° C. or lower, and the vegetable room temperature zone is, for example, 3 to 10 ° C. The switching chamber 40 is provided with a drawer-type storage container. The switching chamber 40 accommodates stored items. A drawer-type switching chamber door 41 integrated with the storage container is provided at the front opening of the switching chamber 40.

In order to detect the air temperature in the switching chamber 40, for example, a temperature sensor (not shown) using a thermistor is installed in the switching chamber 40, for example, on the back wall surface. In addition, a temperature sensor (not shown) such as an infrared sensor or a thermopile for directly detecting the surface temperature of the stored item is installed on the top surface of the switching chamber 40. The control board 100 to be described later controls the amount of cold air flowing into the switching chamber 40 by controlling the opening degree of the switching chamber damper 43 to be described later based on the temperature detected by the temperature sensor. To control.

The vegetable room 50 is a storage room that is provided below the ice making room 30 and the switching room 40 and above the freezing room 60 and is controlled in the temperature range of the vegetable room. In the vegetable compartment 50, a drawer-type storage container is arranged. Vegetable room 50 contains vegetables or other stored items. A drawer-type vegetable compartment door 51 integrated with a storage container is provided at the front opening of the vegetable compartment 50.

The freezer room 60 is arranged in the lowermost layer below the vegetable room 50. The freezer compartment 60 is a storage compartment that is controlled in a freezing temperature zone and can store stored items for a long period of time. In the freezer compartment 60, a drawer-type storage container is arranged. The freezer compartment 60 accommodates stored items. A drawer-type freezer compartment door 61 integrated with a storage container is provided at the front opening of the freezer compartment 60.

In the ice making room 30, the switching room 40, the vegetable room 50, and the freezing room 60, rail members for supporting the storage container so that the storage container can be pulled out are extended in the front-rear direction. A frame is fixed to each door and storage container. By sliding this frame on the rail member directly or via a roller, the door and the storage container can be pulled out integrally.

The machine room 70 is provided in the lowermost part of the back surface of the refrigerator 10, as shown in FIG. In the machine room 70, a compressor 71, a condenser (not shown), and a decompression device (not shown) that constitute a refrigeration cycle included in the refrigerator 10 are arranged.

Compressor 71 compresses the refrigerant in the refrigeration cycle. The refrigerant compressed by the compressor 71 is condensed in the condenser. The condensed refrigerant is depressurized in a capillary tube (not shown) or an expansion valve (not shown) which is a pressure reducing device.

The cooling room 80 is disposed above the machine room 70 on the back side of the refrigerator 10. In the cooling chamber 80, a cooler 81, a cold air circulation fan 82, and a defrosting heater 62 constituting a refrigeration cycle are arranged.

The cooler 81 evaporates the refrigerant decompressed by the decompression device, and cools the surrounding gas by the endothermic action during the evaporation.

The cold air circulation fan 82 is disposed in the vicinity of the cooler 81. The cool air circulation fan 82 blows cool air in the cooling chamber 80 to the refrigerating chamber 20 and the switching chamber 40 via the cool air passage 90.

The defrosting heater 62 includes a glass tube heater, a carbon heater, and the like. The defrosting heater 62 is disposed below the cooler 81 and defrosts the cooler 81. A heater roof 63 is provided between the cooler 81 and the defrosting heater 62 in order to prevent the defrosting water falling from the cooler 81 from directly hitting the defrosting heater 62. The defrost water is discharged from the defrost water discharge port provided below the cooling chamber 80 to the outside of the refrigerator 10, for example, an evaporating dish.

The cold air passage 90 is formed in the back surface of the refrigerator 10 and communicates with the cooling chamber 80. The cool air passage 90 guides the cool air in the cool chamber 80 to the refrigerating room cool air passage 91 via the refrigerating chamber damper 25 by the cool air circulation fan 82, and leads to the switching chamber cool air passage 92 via the switching chamber damper 43.

The cold room cold air passage 91 guides the cold air supplied from the cold air passage 90 via the cold room damper 25 to the cold room 20. As shown in FIG. 3, which is a cross-sectional view taken along the line III-III of FIG. 2, the refrigerating room cool air passage 91 is formed through the hard urethane insulation 98 on the back surface, and is in contact with the refrigerating room 20 through the partition wall 24. ing.

The switching chamber cold air passage 92 guides the cold air supplied from the cold air passage 90 via the switching chamber damper 43 to the switching chamber 40.

The cold room damper 25 connects the cold air passage 90 and the cold room cold air passage 91. The refrigerator compartment damper 25 adjusts the air flow rate of the cold air flowing from the cold air passage 90 into the refrigerator compartment 20 via the cold compartment passage 91 by adjusting the opening degree. Thereby, the refrigerator compartment damper 25 adjusts the temperature in the refrigerator compartment 20. The opening degree of the refrigerator compartment damper 25 is controlled by the control board 100 based on the temperature detected by a temperature sensor (not shown) disposed in the refrigerator compartment 20.

The switching chamber damper 43 connects the cold air passage 90 and the switching chamber cold air passage 92. The switching chamber damper 43 adjusts the amount of cold air flowing from the cold air passage 90 into the switching chamber 40 via the switching chamber cold air passage 92 by adjusting the opening degree. Thereby, the switching chamber damper 43 adjusts the temperature in the switching chamber 40. The opening degree of the switching chamber damper 43 is controlled by the control board 100 based on the temperature detected by a temperature sensor (not shown) disposed in the switching chamber 40.

The electrostatic atomizer 95 is provided on a partition wall 24 formed from a heat insulating material on the back side of the refrigerator compartment 20. The electrostatic atomizer 95 supplies mist for sterilization and humidification in the refrigerator compartment 20. The electrostatic atomizer 95 includes a cooling plate (not shown) for collecting moisture in the air in the storage chamber as condensed water. The cooling plate is installed in contact with or embedded in the partition wall 24 on the back side of the refrigerator compartment 20, for example. The cooling plate condenses moisture in the air in the storage chamber and cools the electrostatic atomizer 95.

The control board 100 includes a microcomputer and is disposed on the back wall of the refrigerator compartment 20. The control board 100 captures operation information of operation switches on the operation panel 101, outputs of various sensors, and the like. The control board 100 performs control of a cooling system such as the opening degree of the refrigerator compartment damper 25 and the switching chamber damper 43, inverter control of a drive motor of the compressor 71, and ice removal control of an automatic ice maker. The control board 100 generates heat as it operates, and the amount of heat generation increases as the control capability and load increase.

Next, the structure of the heat insulation box 110 of the refrigerator 10 will be described.

As shown in FIG. 2, the heat insulation box 110 of the refrigerator 10 includes a top plate, a bottom plate, left and right side walls, a back wall, and a front side door. The heat insulation box 110 has a box shape as a whole.

As shown in FIG. 3, the heat insulating box 110 basically includes an outer box 111, an inner box 112, and a hard urethane heat insulating material 98 formed from a hard urethane foam filled therebetween.

However, regarding the portion surrounding the refrigerator compartment 20, the heat insulating box 110 is configured by combining a hard urethane heat insulating material 98, a vacuum heat insulating material 96, and an additive-containing urethane heat insulating material 97.

In the part surrounding the refrigerator compartment 20, the heat insulating box 110 includes left and right side walls, a rear wall, a front left door 21 and a right door 22.

The left and right side walls and the back wall include an outer box 111 and an inner box 112, and a hard urethane heat insulating material 98 filled therebetween.

As shown in FIG. 4A and FIG. 4B, the outer box 111 has striped recesses 111a and 111b in the vertical direction on the back surface, and a trapezoidal portion 28 corresponding to the refrigerator compartment cool air passage 91 in the center. Have.

The inner box 112 defines a storage room of the refrigerator compartment 20.

The refrigerator compartment cold air passage 91 passes through the base portion 28. The trapezoidal portion 28 is in contact with the refrigerator compartment 20 via the partition wall 24.

Further, a plate-like vacuum heat insulating material 96 is disposed on the table-like portion 28. The vacuum heat insulating material 96 is, for example, a heat insulating material having a structure in which a porous material is vacuum packed with a metal film and exhibiting high heat insulating performance. The vacuum heat insulating material 96 restricts the flow of heat between the cold room 91 having the lowest temperature in the cold room 20 and the outside air.

The vacuum heat insulating material 96 is directly affixed to the outer box 111 of the base 28 via an adhesive such as hot melt or double-sided tape.

Furthermore, an additive-containing urethane heat insulating material 97 is disposed so as to fill the recess 111a and the recess 111b formed in the outer box 111. The additive-containing urethane heat insulating material 97 is disposed so as not to have a gap with the vacuum heat insulating material 96 and partially overlaps in the heat transfer direction. The back surface of the vacuum heat insulating material 96 and the back surface of the additive-containing urethane heat insulating material 97 are formed flush with each other.

The additive-containing urethane heat insulating material 97 has a structure including an additive for improving heat insulating performance in a hard urethane foam which is the same material as the hard urethane heat insulating material 98. For this reason, the additive-containing urethane heat insulating material 97 has better heat insulating performance than the hard urethane heat insulating material 98. As the additive, for example, a foam stabilizer or a polynuclear agent typified by silicone in which a siloxane chain and a polyether chain are combined is used.

The heat conductivity of the additive-containing urethane heat insulating material 97 is about 0.0021 W / mK, which is smaller than the heat conductivity of the hard urethane heat insulating material 98, 0.000020 W / mK. Therefore, the heat insulating performance of the additive-containing urethane heat insulating material 97 is higher than the heat insulating performance of the hard urethane heat insulating material 98.

The additive-containing urethane heat insulating material 97 is molded in advance in an L-shaped cross section and is directly attached to the recess 111a and the recess 111b on the back surface of the outer box 111 via an adhesive such as hot melt or double-sided tape. . That is, the additive-containing urethane heat insulating material 97 is disposed on the outer surface of the heat insulating box 110.

The heat insulating box 110 of this structure is, for example, i) a combination of a pre-molded outer box 111 and an inner box 112, and ii) a refrigerator compartment cold air passage 91 disposed between the outer box 111 and the inner box 112, iii) A urethane foam is filled between the outer box 111 and the inner box 112, iv) a pre-molded additive-containing urethane heat insulating material 97 is attached to the recesses 111a and 111b of the outer box 111, and v) a vacuum heat insulation. The material 96 can be formed by sticking the material 96 to the platform portion 28.

The heat insulating box 110 other than the refrigerator compartment 20 has a structure in which a hard urethane heat insulating material 98 is filled between the outer box 111 and the inner box 112.

As described above, according to the configuration of the first embodiment, the heat insulating box 110 is configured by combining the hard urethane heat insulating material 98, the additive-containing urethane heat insulating material 97, and the vacuum heat insulating material 96. . Although the additive-containing urethane heat insulating material 97 has almost the same material and cost as the hard urethane heat insulating material 98, the heat insulating performance is high. Therefore, a vacuum heat insulating material 96 is disposed on the back surface of the cold room cold air passage 91 where the highest heat insulating performance is required, and an additive-containing urethane heat insulating material 97 is disposed around the vacuum heat insulating material 96. Costs can be reduced while ensuring high heat insulation performance.

In other words, a significant decrease in the heat insulating performance of the heat insulating wall can be suppressed while restricting the covering area of the vacuum heat insulating material 96 to the storage part. In addition, the cost of the refrigerator 10 and the weight of the refrigerator 10 can be reduced throughout the manufacturing process, compared to the case where the covering area of the vacuum heat insulating material 96 is increased. Moreover, since the usage-amount of the vacuum heat insulating material 96 can be suppressed, the weight reduction of the whole can be achieved. Furthermore, by restricting the covering area of the vacuum heat insulating material 96, it is possible to suppress interference with the ribs, convex portions, cutout portions, and the like of the parts constituting the heat insulating wall when the vacuum heat insulating material 96 is attached. By suppressing the interference, it is possible to suppress a defect caused by a hole in the outer sheet of the vacuum heat insulating material 96 caused by the interference.

In addition, as shown in FIG. 7, the refrigerating room cold air passage 91 may be disposed inside the refrigerating room 20 through the inner box 112.

Further, the additive-containing urethane heat insulating material 97 and the vacuum heat insulating material 96 may not be arranged so as to partially overlap in the heat transfer direction. For example, as shown in FIG. 7, the additive-containing urethane heat insulating material 97 may be arranged to be separated from the left and right of the vacuum heat insulating material 96.

Further, the heat insulating box body 110 may be formed by filling the additive-containing urethane heat insulating material 97 directly between the outer box 111 and the inner box 112 instead of directly sticking to the outer box 111. For example, the heat insulating box body 110 shown in FIG. 7 includes: i) a combination of a pre-molded outer box 111 and an inner box 112; ii) affixing a vacuum heat insulating material 96 to the outer box 111; It can be formed by filling the box 112 with a hard urethane insulation 98, and then iv) filling the back corner with an additive-containing urethane insulation 97 with the same injection system.

(Second Embodiment)
In 1st Embodiment, the vacuum heat insulating material 96 and the additive containing urethane heat insulating material 97 were arrange | positioned covering the back surface in which the refrigerator compartment cold air | gas channel | path 91 is arrange | positioned. This invention is not limited to this, The position which arrange | positions the vacuum heat insulating material 96 and the additive containing urethane heat insulating material 97 is arbitrary.

For example, as shown in the cross-sectional view of FIG. 5A and the front view of FIG. 5B, the left door 21 and the right door 22 of the refrigerator compartment 20 may be composed of the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97. .

Further, as shown in the cross-sectional view of FIG. 8, an additive-containing urethane heat insulating material 97 may be disposed in a region in contact with the left door 21 and the right door 22. It is difficult to attach the vacuum heat insulating material 96 to this region. Further, this region is near the door which is a heat intrusion portion. Therefore, by disposing the additive-containing urethane heat insulating material 97 in this region, it is possible to obtain a high heat insulating effect at a lower cost than when the vacuum heat insulating material 96 is newly disposed.

Furthermore, as shown in the cross-sectional view of FIG. 9, the additive-containing urethane heat insulating material 97 may be disposed at the four corners of the heat insulating box 110. Furthermore, an additive-containing urethane heat insulating material 97 may be attached to the inner wall of the left door 21 and the inner wall of the right door 22.

(Third embodiment)
Further, as shown in FIG. 6, a vacuum heat insulating material 96 may be disposed on the back surface of the cold air passage 90. Further, an additive-containing urethane heat insulating material 97 may be disposed in the vicinity of the cold air passage 90 so as to partially overlap the vacuum heat insulating material 96, as in the vicinity of the cold room cold air passage 91 shown in FIG. The cooling chamber 80 and the cold air passage 90 are places where the temperature difference with the outside air is the largest in the refrigerator 10. By disposing the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97 here, a high heat insulating effect can be obtained at low cost.

Further, a vacuum heat insulating material 96 may be disposed between the machine room 70 and another chamber, and an additive-containing urethane heat insulating material 97 may be disposed so as to partially overlap the vacuum heat insulating material 96 in the vicinity thereof. . For example, the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97 may be attached to a partition plate provided in the machine room 70. The configurations of the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97 are applied to the heat insulating materials indicated by reference numerals 96 and 97 in the machine room 70 in FIG.

Moreover, since the control board 100 controls the refrigerator compartment 20, the ice making compartment 30, the switching compartment 40, the vegetable compartment 50, and the freezer compartment 60 to be cooled to appropriate temperatures, the temperature is higher than room temperature due to heat generation. . Further, the higher the load of the refrigerator 10 such as the automatic ice making function and the inverter function, the more complicated the control board 100 becomes and the higher the temperature becomes.

By disposing a heat insulating material or additive-containing urethane heat insulating material 97 in combination with a vacuum heat insulating material 96 having a high heat insulating effect and an additive-containing urethane heat insulating material 97 on the heat insulating wall of the control room where the control board 100 is disposed, Since the temperature difference between the inside and outside of the refrigerator 10 is high, the heat insulation effect can be improved. For example, the heat insulation effect can be improved by sticking a heat insulating material combining the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97 to the heat insulating wall of the control room. The configurations of the vacuum heat insulating material 96 and the additive-containing urethane heat insulating material 97 are applied to the heat insulating materials indicated by reference numerals 96 and 97 of the control board 100 in FIG. The control board 100 also controls the entire system of the refrigerator 10.

When cooling the inside of the heat insulation box 110, a heat radiating pipe in which a refrigerant is circulated may be arranged. In such a case, you may make it arrange | position the said additive containing urethane heat insulating material in the boundary area | region of a thermal radiation pipe installation location and another chamber.

In addition, a heat insulating material appropriately combined with a vacuum heat insulating material 96 and an additive-containing urethane heat insulating material 97 may be disposed between the heat generating portion and each chamber to be cooled and between each room to be cooled and the outside air. Good.

(Fourth embodiment)
In the above-described embodiment, the hard urethane heat insulating material 98 and one additive-containing urethane heat insulating material 97 are arranged. This invention is not limited to this, As shown in FIG. 10, you may further arrange | position the 2nd additive containing urethane heat insulating material 99 which is a kind different from the additive containing urethane heat insulating material 97. As shown in FIG. The second additive-containing urethane heat insulating material 99 is an additive-containing urethane heat insulating material containing an additive different from the additive-containing urethane heat insulating material 97.

The heat conductivity of the second additive-containing urethane heat insulating material 99 may be not less than the heat conductivity of the additive-containing urethane heat insulating material 97 and not more than the heat conductivity of the hard urethane heat insulating material 98, or the additive-containing urethane. It may be equal to or lower than the thermal conductivity of the heat insulating material 97. The 2nd additive containing urethane heat insulating material 99 is suitably arrange | positioned according to the necessity for heat insulation.

Moreover, if necessary, three or more kinds of additive-containing urethane heat insulating materials may be arranged.

(Fifth embodiment)
In the present embodiment, the density of the additive-containing urethane heat insulating material 97 located in the region in contact with the back corner and the door of the heat insulating box 110 is made higher than that of other portions. By increasing the density, it is possible to increase the rigidity of the back corner and the portion that contacts the door.

During use of the refrigerator, a load is always applied to the back corner and the portion that comes into contact with the door from the storage stored in the door and the door. For example, as shown in FIG. 11, when the additive-containing urethane heat insulating material 97 is disposed in a region in contact with the back corner and the door, the urethane foam filled in the portion in contact with the back corner and the door is high. Stress is generated and can be deformed. By increasing the rigidity of the corners in contact with the back corners and the door, deformation of the heat insulating box 110 due to these loads can be suppressed. Accordingly, it is possible to reduce a reinforcing member (not shown) that is formed by sheet metal pressing or the like that is installed for suppressing deformation.

It should be noted that the location where the density of urethane is increased may be only the back corner or only the region in contact with the door.

It should be noted that the arrangement of the rooms described above is not limited to this embodiment, and may be configured as follows. An ice making chamber 30 and a switching chamber 40 are arranged in parallel on the left and right below the refrigerating chamber 20 provided in the upper stage. A freezing room 60 is arranged below the ice making room 30 and the switching room 40 arranged in parallel on the left and right and above the vegetable room 50 provided in the lower stage. A configuration in which the freezing room 60 is disposed between the vegetable room 50, the ice making room 30 and the switching room 40 is referred to as a mid freezer type. In the configuration of the mid freezer type, the low temperature chambers such as the ice making chamber 30, the switching chamber 40, and the freezing chamber 60 are closer to each other than the configuration shown in FIG. Therefore, there are few heat leaks, and energy saving and cost reduction are realized.

Further, in the embodiment, the left door 21 and the right door 22 of the refrigerator compartment 20 are kannon type doors, but the present invention is not limited to this, and may be, for example, a single rotary door.

In the embodiment, the machine room 70 is provided at the lowermost rear part of the refrigerator 10, but the machine room 70 may be provided at the upper rear part or the uppermost rear part.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2017-084484 filed on Apr. 21, 2017. The specification, claims, and entire drawings of Japanese Patent Application No. 2017-084484 are incorporated herein by reference.

The present invention is suitable for a heat insulating box and a refrigerator.

10 refrigerators, 20 refrigerator compartments, 21 left doors, 22 right doors, 24 partition walls, 25 refrigerator compartment dampers, 26 shelves, 27 shelves, 28 trapezoids, 29 containers, 30 ice making rooms, 31 ice making room doors, 40 switching rooms 41, switching room door, 43, switching room damper, 50 vegetable room, 51 vegetable room door, 60 freezing room, 61 freezing room door, 62 heater for defrosting, 63 heater roof, 70 machine room, 71 compressor, 80 cooling room, 81 cooler, 82 cold air circulation fan, 90 cold air passage, 91 cold room cold air passage, 92 switching room cold air passage, 95 electrostatic atomizer, 96 vacuum heat insulating material, 97 additive-containing urethane heat insulating material, 98 hard urethane heat insulating material 99, second additive-containing urethane insulation, 100 control board, 101 operation panel, 110 insulation box, 111 outer box, 112 inside , 111a recessed portion, 111b recessed portion.

Claims (18)

1. A heat insulation box formed in a box shape and having a region formed by a first urethane heat insulating material and a region formed by a second urethane heat insulating material having a thermal conductivity smaller than that of the first urethane heat insulating material. body.
2. The second urethane heat insulating material is an additive-containing urethane heat insulating material in which an additive is contained in the first urethane heat insulating material.
   The heat insulation box of Claim 1.
3. The heat insulating box includes a plurality of regions formed by the second urethane heat insulating material,
   The heat insulation box of Claim 1 or 2.
4. The heat insulation box has a plurality of chambers,
   Among the plurality of chambers, including a region formed by the second urethane heat insulating material on a wall between the chamber and the outside air having a temperature lower than the outside air and a temperature difference with the outside air being larger than the other chambers.
   The heat insulation box of any one of Claim 1 to 3.
5. The heat insulation box has a plurality of chambers,
   Including a region formed by the second urethane insulation on the wall between the higher temperature chamber and the lower temperature chamber;
   The heat insulation box of any one of Claim 1 to 4.
6. The heat insulating box further includes a vacuum heat insulating material,
   The heat insulation box of any one of Claim 1 to 5.
7. The second urethane heat insulating material is disposed around the vacuum heat insulating material and partially overlapping with the vacuum heat insulating material,
   The heat insulation box of Claim 6.
8. It has a door for opening and closing the room on the front,
   The second urethane heat insulating material is provided in a region in contact with the door,
   The heat insulation box of any one of Claim 1 to 7.
9. The back corner is provided with the second urethane heat insulating material,
   The heat insulation box of any one of Claim 1 to 8.
10. The outer surface is provided with the second urethane heat insulating material,
    The heat insulation box of any one of Claim 1 to 9.
11. It has a door for opening and closing the room on the front,
    The density of the urethane heat insulating material disposed in the area in contact with the door and / or the back corner is higher than the density of the urethane heat insulating material disposed in other locations.
    The heat insulation box of any one of Claim 1 to 10.
12. A region further formed by a third urethane heat insulating material having a lower thermal conductivity than the second urethane heat insulating material;
    The heat insulation box of any one of Claim 1 to 11.
13. The heat insulation box according to any one of claims 1 to 12,
    A cooling system for cooling the inside of the chamber in the heat insulation box;
    Refrigerator.
14. The heat insulation box has a plurality of chambers,
    The cooling system includes a compressor that compresses the refrigerant,
    The heat insulation box has a machine room having the compressor inside,
    The second urethane heat insulating material is disposed in a boundary region between the machine room and another room,
    The refrigerator according to claim 13.
15. The heat insulation box has a plurality of chambers,
    The cooling system includes a control board that controls the cooling system;
    The heat insulation box has a control chamber having the control board inside,
    The second urethane heat insulating material is disposed in a boundary region between the control room and another room,
    The refrigerator according to claim 13 or 14.
16. The cooling system has a cooler for cooling the inside of the heat insulating box,
    The heat insulation box has a cooling chamber having the cooler inside,
    The second urethane heat insulating material is disposed in a boundary region between the cooling chamber and another chamber.
    The refrigerator according to any one of claims 13 to 15.
17. In the heat insulation box, a heat radiating pipe for radiating heat is arranged,
    The second urethane heat insulating material is arranged in a boundary region between the arrangement place of the heat radiating pipe and another chamber,
    The refrigerator according to any one of claims 13 to 16.
18. The heat insulation box includes a cold air passage through which the cold air generated by the cooling system passes.
    The second urethane heat insulating material is disposed along the cold air passage.
    The refrigerator according to any one of claims 13 to 17.

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