JP3692515B2 - Insulated container and insulated cooker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat insulating container and a heat insulating cooker that perform heat insulation with a vacuum layer.
[0002]
[Problems to be solved by the invention]
Conventionally, as this type, a heat insulating cooker has been disclosed in Japanese Utility Model Publication No. 4-28490 in column 2, line 15 to column 3, line 5, FIG. The heat insulating cooker includes a metal heat insulating container having an upper opening, a metal cooking pot having an inner lid that is housed in the heat insulating container with a space therebetween, and the upper opening is closed. A heat insulating outer lid and a bottom member made of synthetic resin provided on the outer surface of the bottom of the heat insulating container. The bottom member is integrally provided with legs, and a cooking pot together with an appropriate amount of water and the like After heating and storing the cooking ingredients and water separately, storing them in the cooking pan, storing the cooking pot in an insulated container together with the inner lid, closing the insulated outer lid, and the required time By holding in an adiabatic state, cooking such as cooking is performed.
[0003]
The heat insulating container is a bottomed metal inner and outer container provided with a vacuum heat insulating layer. The vacuum heat insulating layer is made of a metal, for example, a stainless steel outer container in which a through hole for evacuation is previously formed. After joining and integrating the upper opening of the metal inner container, the bottom surface of the outer container is turned upward, and vacuum heating is performed with a sealing material such as glass or brazing material placed in the through hole. By installing in the furnace, drawing the gas between the inner and outer containers from the through-hole in the vacuum heating furnace, and then heating to a predetermined temperature to melt the sealing material and seal the through-hole A vacuum heat insulating layer is formed between the inner and outer containers and then cooled to obtain a product.
[0004]
However, in the prior art, the outer container is once heated to a high temperature at which the sealing material melts and sealed, and then cooled and returned to atmospheric pressure. Therefore, the outer container bends as the pressure changes. As a result, there is a concern that the sealing material is deformed along with this bending, and defects such as cracks are generated. In order to solve such a problem, for example, it is conceivable that the deformation of the deformation due to the pressure change is diffused by making the bottom surface of the outer container hemispherical like the outer container of a thermos bottle. If the outer container of an insulated cooker is made hemispherical as described above, the overall height of the insulated cooker becomes large and bulky, and problems such as complicated handling arise. Again, the bottom of the outer container had to be formed flat. Furthermore, not only at the time of the manufacture described above, there is a risk that the sealing material may crack due to the deformation force when the heat-insulating cooker is handled relatively violently.
[0005]
Then, an object of this invention is to provide the heat insulation container and heat insulation cooker with which a crack etc. do not arise in the sealing material which sealed the through-hole by the pressure change produced at the time of evacuation.
[0006]
[Means for Solving the Problems]
The invention of claim 1 is a heat insulation in which a vacuum-evacuating through-hole is formed in one of the bottomed metal inner and outer containers, and the through-hole is sealed with a sealing material to provide a vacuum heat insulating layer. In the container, an annular protrusion is integrally formed around the through hole. Therefore, according to the first aspect of the present invention, it is possible to suppress the deforming force of the pressure change that occurs when the outside of the through hole and the sealing material is evacuated to the inside due to the protrusion.
[0007]
The invention according to claim 2 is characterized in that the through hole is formed at the center of the bottom surface of either the inner or outer container, and the protrusion is provided concentrically with the through hole. This is an insulated container. Therefore, in the invention of claim 2, local stress is unlikely to be generated in the ridge, and it is possible to further suppress the inward transmission of the deformation force of the pressure change that occurs when evacuating the outside of the through hole and the sealing material.
[0008]
According to a third aspect of the present invention, there is provided a heat-insulating container provided with a vacuum heat insulating layer and an upper opening provided between a bottomed cylindrical metal inner and outer container, and an inside of the heat insulating container that can be freely inserted and removed. In a heat-insulating cooker comprising a cooking pan having a lid and a heat-insulating outer lid capable of closing the upper opening, a through-hole for evacuation is formed on the bottom surface of the outer container, and the through-hole is sealed The heat insulating cooker is characterized in that an annular protrusion is integrally formed around the through hole. Therefore, in the invention of claim 3, it is possible to suppress the deforming force of the pressure change generated when the outside of the through-hole formed on the bottom surface of the outer container and the sealing material is evacuated from being transmitted to the inside by the protrusion.
[0009]
The invention according to claim 4 is the heat-insulating cooker according to claim 3, wherein the through hole is formed in the center of the bottom surface of the outer container, and the protrusion is provided concentrically with the through hole. is there. Therefore, in the invention of claim 4, local stress is unlikely to occur in the ridge, and it is possible to further suppress the inward transmission of the deformation force of the pressure change that occurs when evacuating the outside of the through hole and the sealing material.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. 1 is a metal heat insulating container, and this heat insulating container 1 has a cylindrical shape, and an outer container 4 made of metal, for example stainless steel, as well as an inner container 3 made of metal, for example stainless steel, joined with a wide-mouthed portion 2 as an upper opening. A vacuum heat insulating layer 5 is provided therebetween to form a metal vacuum double container. The inner container 3 has a circular flat bottom surface 3A and a cylindrical peripheral surface 3B, and the outer container 4 has a circular flat bottom surface 4A and a cylindrical peripheral surface 4B. . Reference numeral 6 denotes first handles provided on both sides of the upper portion of the heat insulating container 1, and the first handle 6 is a ring shape made of a heat-resistant synthetic resin that is forcibly fitted to the upper portion of the outer surface 4B of the outer container 4. A first recess 8 is formed at the approximate center of the upper surface of the first handle 6 and is formed on one side of the first recess 8. A convex portion 10 is formed on the upper surface of the one side flat portion 9, and another side flat portion 11 is formed in the first recess 8. Step portions 9A and 11A are formed in the flat portions 9 and 11, respectively. Further, a hinge receiving portion 13 is integrally formed on one side of the shoulder member 7 so as to face a diagonal line 12 connecting the pair of first handles 6, and the wide opening is connected to the hinge receiving portion 13 via a hinge shaft 14A. The pivoting portion 16 of the heat insulating outer lid 15 that closes the portion 2 is rotatably connected, and the hinge receiving portion 13, the hinge shaft 14A, and the pivoting portion 16 constitute the hinge 14. The hinge shaft 14A attached to the pivot attachment portion 16 is detachably provided on the hinge receiving portion 13. The heat insulating outer cover 15 is provided with a heat insulating layer 19 such as a foam material between the upper surface member 17 and the lower surface member 18 inserted into the wide mouth portion 2. A notch portion 20 that communicates the inside and the outside is formed so as to cover the upper side of the handle 6 on the attachment side with a space therebetween, and an overhang portion 21 is provided outside the notch portion 20. A plate-like heat insulator 22 hangs downward from the lower surface of the notch 20 so as to avoid a mounting arm portion of a second handle described later. A knob 23 is erected on the upper surface of the heat insulating outer cover 15 on the side opposite to the hinge receiving portion 13. The outer container 4 is provided with a transparent coating layer 4C at least on the outer surface 4B outside thereof to perform a clear process, and a synthetic resin bottom member 25 having legs 24 on the bottom surface.
[0011]
Further, a vacuum evacuating through hole 26 is formed at the center of the bottom surface 4A of the outer container 4, and a sealing material 27 such as brazing material or glass is provided in the through hole 26 for sealing. In addition, an annular protrusion 28 serving as a protective body is provided concentrically around the through hole 26 downward. The protrusion 28 is in the form of a small ring-shaped protrusion, and its inner peripheral side 29 and outer peripheral side 30 are formed in a gentle slope shape close to the through hole 26, and its height H is about 1 to 2 mm, preferably It is about 1.5 mm. Accordingly, as shown in FIGS. 4 and 5, the bottom surface 4A of the outer container 4 integrated with the inner container 3 is accommodated in the vacuum heating furnace 31 with the bottom surface 4A facing upward, and is made of a brazing material, glass or the like as indicated by a one-dot chain line. The material 32 is placed on the through-hole 26, and the inside of the vacuum heating furnace 31 is kept at, for example, 10-2 Torr or less, and the temperature is slightly higher by the heating means 33 such as high-frequency heating, electron beam heating, or radiation heating using a resistance wire. Heat to. By this vacuum heating, the air in the inner and outer containers 3 and 4 is exhausted from the through-hole 26 and is maintained at the same degree of vacuum as the vacuum heating furnace 31, and on the metal plate surfaces of the inner and outer containers 3 and 4. The adhering impurities evaporate, the surface is cleaned and becomes a mirror surface, and the radiation heat insulation effect is enhanced. Further, by raising the temperature of the vacuum heating furnace 31, the sealing material 32 is melted to seal the through hole 26, and the sealing material 27 is formed. Thereby, between the inner and outer containers 3 and 4 can be maintained in a high vacuum state. Thus, after forming the sealing material 27 of the through-hole 26, the heating by the heating means 33 is stopped, and the heat insulating container 1 is cooled by natural cooling or the like to form the heat insulating container 1.
[0012]
By the way, after forming the sealing material 27 of the through hole 26, the heat insulating container 1 is cooled and the pressure is released to the atmospheric pressure. At this time, the bottom surface 4A is deformed due to the pressure change, and this deformation is caused. As a result, a force is applied to the sealing material 27 fixed to the through-hole 26 and a crack or the like may occur, but by providing the annular protrusion 28 integrally around the through-hole 26, the protrusion 28 Due to the processing effect, the through hole 26 is hardly deformed, and the possibility of breakage such as a crack in the sealing material 27 can be eliminated.
[0013]
34 is a cooking pan made of metal, for example, stainless steel, that can be stored in the heat insulating container 1, and this cooking pot 34 is slightly smaller in diameter and shallower than the inner container 3. A second handle 36 is connected via the. The mounting arm portion 35 is made of metal, for example, stainless steel, and has an L-shaped side surface. The base end 35A is fixed to the upper part of the outer peripheral surface of the cooking pan 34, and the tip 35B has a U-shaped flat surface. It can be placed on the wide opening 2 through the notch 20. The handle body 36A of the second handle 36 fixed to the tip 35B of the mounting arm portion 35 is made of synthetic resin, and a second recess 37 is formed on the lower surface of the handle body 36A. A concave portion 39 that engages with the convex portion 10 is formed in the one side flat portion 38 formed on one side of the second concave portion 37, and the other side flat portion 40 is formed on the other side of the second concave portion 37. Is formed. Furthermore, a corner portion 36B that can be engaged with the stepped portions 9A and 11A is formed on the tip 35B side of the handle main body 36A. The heat insulator 22 is inserted from above between the tips 35B of the mounting arm portion 35 having a bifurcated shape so that the inside and outside can be insulated. Reference numeral 41 denotes an inner lid made of a metal, for example, stainless steel, which closes the upper opening of the cooking pan 34. A knob 42 is erected at the approximate center of the upper surface of the inner lid 41.
[0014]
Next, the operation of the above configuration will be described. The cooking ingredients are stored in a cooking pan 34 together with an appropriate amount of water and heated on a gas stove etc. and then the inner lid 41 is closed, or the cooking ingredients and water are heated separately, and then the cooking pot 34 And the inner lid 41 is closed. Then, a hand is put on the second handle 36 to store the cooking pot 34 in the heat insulating container 1. At this time, the mounting arm portion 35 is placed on the wide mouth portion 2, and the cooking pan 34 is held in a suspended state with a slight gap from the inner container 3. Further, since the corner portion 36B is engaged with the step portions 9A, 11A of the first handle 6, and the concave portion 39 is engaged with the convex portion 10, the first and second handles 6, 36 are guided. Can be set while. As a result, the first and second handles 6 and 36 are set so as to overlap each other with the mounting arm 35 in a predetermined state corresponding to the notch 20. Next, when the heat insulating outer cover 15 is closed with the hinge shaft 14A as the rotation center and left to stand, the cooking material is in a heat insulating state for a required time, and cooking can be performed. When the insulated container 1 is carried along with the cooking pot 34, the first handle 6 can be carried and carried. When the insulated outer lid 15 is opened and the cooking pot 34 is taken up, the first and The cooking pot 34 can be taken out by putting a hand in the space 33 formed between the second recesses 8 and 37 and lifting the second handle 36.
[0015]
As mentioned above, in the said Example, the heat insulation container 1 which has the wide mouth part 2, the metal cooking pot 34 which is accommodated in this heat insulation container 1 so that insertion / extraction is possible, and the wide mouth part 2 can be closed. In the heat insulating container 1 such as a heat-insulated cooker provided with an outer lid 15, a vacuum evacuating through hole 26 is formed on the bottom surface 4 </ b> A of the outer container 4, and the through hole 26 is sealed with a sealing material 27 to provide vacuum insulation. By providing the layer 5 and integrally forming the annular protrusion 28 around the through hole 26, the sealing material 32 is melted at a high temperature to seal the through hole 26, and then cooled and atmospheric pressure Deformation around the through hole 26 due to the pressure change of the bottom surface 4A that occurs when opening can be suppressed by the protrusion 28, and as a result, the possibility of cracks and the like occurring in the sealing material 27 can be eliminated. In addition, cracks or the like may occur in the sealing material 27 even when the heat insulating cooker is handled relatively violently. However, this can be prevented by the protrusions 28 in such a case. Therefore, even if the bottom surface 4A of the outer container 4 is flat, a good product can be obtained, such as ensuring heat retaining performance. Moreover, lowering the height of the outer container 4 by flattening the bottom surface 4A can reduce the overall height in the case of an insulated cooking container, and can improve handling.
[0016]
Further, in the outer container 4 of the heat insulating container 1 such as the heat insulating cooker, the through hole 26 is formed in the center of the bottom surface 4A of the outer container 4, and the protrusion 28 is provided concentrically with the through hole 25. As a result, local stress is less likely to be generated inside the protrusion 28 during the pressure change, and the sealing material 27 can be reliably protected. Further, by providing the through hole 26 at the center of the bottom surface 4A of the outer container 4, positioning or the like when forming the through hole 26 or the protrusion 28 by press working or the like can be easily performed.
[0017]
Further, since the outer peripheral sides 29 and 30 of the protrusion 28 are gentle, that is, have a curved slope, local stress does not occur in the longitudinal section, and this also causes the sealing located on the inner side. The stopper 27 can be reliably protected.
[0018]
Further, by providing the transparent paint layer 4C on the outer side of at least the outer peripheral surface 4B of the outer container 4, the appearance can be improved, and dirt such as fingerprints is less likely to adhere, and the aesthetics and cleanability can be improved. Furthermore, since the surface frictional resistance is reduced by the transparent paint layer 4C, the shoulder member 7 and the bottom member 25 can be easily engaged with each other.
[0019]
In addition, this invention is not limited to the said Example, For example, although the case of the heat insulation cooker was shown in the Example, You may utilize for heat insulation containers other than a heat insulation cooker, and, in an Example, an outer container Although the case where a through-hole is provided is shown, a through-hole and a sealing material may be provided on the inner container side. Further, in the embodiment, a single ridge is shown, but a plurality of ridges are provided concentrically. Various modifications are possible.
[0020]
【The invention's effect】
According to the first aspect of the present invention, a vacuum evacuating through hole is formed in one of the bottomed metal inner and outer containers, and the through hole is sealed with a sealing material that melts the vacuum heat insulating layer. In the heat insulation container provided, by deforming and cracking the sealing material that melts with the heat sealing the through-hole by integrally forming a circularly inclined annular protrusion around the through-hole. It protects against the occurrence , and prevents deformations such as pressure changes from being transmitted to the sealing material by the protrusions, thereby preventing the sealing material from being cracked.
[0021]
According to a second aspect of the present invention, the inner peripheral side and the outer peripheral side of the annular ridge are gently inclined, and the through hole is formed at the center of the bottom surface of either the inner or outer container. The heat insulating container according to claim 1, wherein the protrusion is provided concentrically with the protrusion, and local stress is unlikely to be generated on the protrusion, and deformation force such as pressure change is not transmitted to the sealing material. In addition, it is possible to reliably prevent cracks and the like from occurring in the sealing material, and it is also possible to easily process through holes and ridges.
[0022]
The invention according to claim 3 is provided with a heat insulating container provided with a vacuum heat insulating layer between the inner and outer containers of a bottomed cylindrical metal and an upper opening, and accommodated in the heat insulating container so as to be freely put in and out. In a heat insulating cooker including a cooking pan having an inner lid and a heat insulating outer lid capable of closing the upper opening, a vacuum evacuating through hole is formed in the bottom surface of the outer container, and the through hole is heated with heat. With heat that seals with a melting sealing material and seals the through-hole located inside the ridge by integrally forming a gradually inclined annular ridge around the through-hole. It is a heat insulation cooker characterized by protecting the melting sealing material from deformation and occurrence of cracks, so that deformation force such as pressure change is not transmitted to the sealing material on the bottom surface of the outer container. Since it can prevent the occurrence of cracks, etc., the height of the outer container, and thus heat insulation The height of the entire physical device smaller to be provided to handle arbitrarily good adiabatic cooker.
[0023]
According to a fourth aspect of the present invention, the inner peripheral side and the outer peripheral side of the annular protrusion are gently inclined, the through hole is formed in the center of the bottom surface of the outer container, and the concentric circle with the through hole 4. The heat insulating cooker according to claim 3, wherein a protrusion is provided, the generation of local stress in the protrusion is suppressed, and a deformation force such as a pressure change is reliably applied to the sealing material on the bottom surface of the outer container. Since it is possible to prevent cracks from occurring in the sealing material without being transmitted, it is easy to handle by reducing the height of the outer container and thus the overall height of the heat-insulating cooker. It is possible to provide an insulated cooker that can easily perform strip processing and the like.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing an embodiment of the present invention.
3 is a cross-sectional view taken along line III-III in FIG.
FIG. 4 is a perspective view of a heat insulating container showing an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a main part showing an embodiment of the present invention.
FIG. 6 is a perspective view of essential parts showing an embodiment of the present invention.
[Explanation of symbols]
1 Insulated container 2 Wide mouth (upper opening)
3 Inner container 3A Bottom surface 4 Outer container 4A Bottom surface 5 Vacuum heat insulating layer
15 Insulated outer lid
26 Through hole
27 Encapsulant
28 ridges
34 Cooking pan
41 Inner lid

Claims (4)

In the heat-insulating container in which a vacuum-evacuating through-hole is formed in one of the bottomed metal inner and outer containers, and the through-hole is sealed with a sealing material that melts, the vacuum insulating layer is provided. It is characterized by protecting the through hole from being deformed or cracked by forming a single piece by surrounding a gently inclined annular ridge around the hole, thereby melting the sealing material melted by the heat sealing the through hole. Insulated container. The inner and outer peripheral sides of the annular ridge are gently inclined, and the through hole is formed at the center of the bottom of either the inner or outer container, and the ridge is concentrically formed with the through hole. The heat insulation container according to claim 1 provided. A bottomed cylindrical metal inner, a heat insulating container provided with a vacuum heat insulating layer between the outer container and an upper opening, and a cooking pan having an inner lid that is housed in and out of the heat insulating container, In the heat insulating cooker provided with a heat insulating outer lid capable of closing the upper opening, a vacuum evacuating through hole is formed in the bottom surface of the outer container, and the through hole is sealed with a sealing material that is melted by heat. In addition, a gradually inclined annular ridge is integrally formed around the through hole, and the sealing material that is melted by heat sealing the through hole located inside the ridge is deformed. An insulated cooker that protects against cracking . The inner peripheral side and the outer peripheral side of the annular protrusion are gently inclined, the through hole is formed at the center of the bottom surface of the outer container, and the protrusion is provided concentrically with the through hole. The heat-insulating cooker according to claim 3.

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