JPH10127501A - Thermal insulation vessel for cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost and to improve thermal insulation of a vessel for cooking by simplifying a structure to prevent collapse of an outer vessel with a vacuum layer between the outer vessel and an inner vessel. SOLUTION: At either one point of a bottom part 5a of an inner vessel 5 or a bottom part 6a of an outer vessel 6, a projection 9 to keep a distance with the other vessel is integrally formed in the press formation process. At the remaining one point of the two bottom parts 5a and 6a, a dent 10 to be connected to the projection 9 to keep the distance is integrally formed in order to make positioning work of the inner vessel 5 and the outer vessel 6 during production easy. An approximately tapered projection 9 to keep the distance makes thermal conduction distance of itself long between the inner vessel 5 and the outer vessel 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated cooking container which can be suitably used for a cooking method in which a semi-cooked food is kept warm by heating to obtain a finished cooked food.

[0002]

2. Description of the Related Art In this kind of insulated cooking container, as described in, for example, Japanese Utility Model Application Laid-Open No. 7-36949, an inner container for containing cooked goods is housed in an outer container having heat insulation. ing. The outer container is a metal vacuum double container in which a vacuum heat insulating layer is formed between the outer tube and the inner tube, and the outer tube and the inner tube are connected to each other at their upper ends. Therefore, a spacer is interposed between the bottom of the outer cylinder and the bottom of the inner cylinder of the outer container in order to prevent the bottom of the outer container from being deformed and crushed by the atmospheric pressure. Conventionally,
This spacer is a separate member from the outer cylinder and the inner cylinder, and has a bottomed cylindrical shape having a flange on the opening side. Then, the bottom and the flange of the spacer abut against the outer cylinder and the inner cylinder, respectively, and are spot-welded to the outer cylinder or the inner cylinder for positioning.

[0003] However, in the above-mentioned conventional insulated cooking container, the contact area between the spacer and the outer and inner cylinders is large, and
Since the side surface of the spacer is vertical, there is a problem that heat inside the outer container is easily transmitted to the outside through the spacer. In addition, the spacer is a separate member from the outer cylinder and the inner cylinder, so the number of parts increases, and a step of spot-welding the spacer to the outer cylinder or the inner cylinder is required. There was also a problem of bulging.

On the other hand, Japanese Patent Application Laid-Open No. 7-327844 discloses a bottom portion 101a of an outer cylinder 101 as shown in FIG.
A projection that is close to or in contact with the bottom 102a of the inner cylinder 102.
Although it is described that the bottom 103a of the inner cylinder 102 is prevented from being deformed by integrally forming the 103, the bottom 102a of the inner cylinder 102 is planar in the publication described in the publication. In addition,
In FIG. 14, reference numerals 104 and 105 denote an outer cylinder 101 and an inner cylinder 102.
Are flange portions respectively provided at the mouth portion (opening side). At the time of manufacture, the butted flange portions 104 and 105 are welded to join the inner cylinder 102 and the outer cylinder 103, and then air is evacuated from between the inner cylinder 102 and the outer cylinder 103. With this evacuation, the projection 103 of the outer cylinder 101
Can be brought into contact with the bottom 102a of the inner cylinder 102, but this can be achieved by using the flanges 104 of the inner cylinder 102 and the outer cylinder 103.
, 105 in advance.

In the heat-insulating cooking container described in JP-A-7-327844, the bottom portion 102a of the inner cylinder 102 is flat, so that at the time of manufacture, as shown in FIG.
And the outer cylinder 103 tend to shift in the radial direction. If such a shift occurs, welding of the inner cylinder 102 and the outer cylinder 103 becomes difficult.

[0006]

As described above, in the conventional insulated cooking container, a spacer separate from the inner tube and the outer tube is interposed between the inner tube and the outer tube. There were problems such as increased costs. Also, in the heat-insulating cooking container described in JP-A-7-327844, in which a protruding portion that is close to or in contact with the bottom of the inner cylinder is integrally formed on the bottom of the outer cylinder, the bottom of the inner cylinder is flat. Therefore, there is a problem that the alignment between the outer cylinder and the inner cylinder is troublesome during manufacturing.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and can reduce the number of parts, reduce the number of steps and labor required for manufacturing, reduce the cost, and improve the heat insulating performance. An object is to provide a good heat insulation cooking container.

[0008]

According to a first aspect of the present invention, there is provided an outer container having a heat insulating property in which a vacuum heat insulating layer is formed between an inner cylinder and an outer cylinder. A heat-insulating cooking container comprising: an inner container housed so as to be able to be taken in and out through the opening thereof; and a heat-insulating lid member for closing the opening of the outer container when the inner container is housed. An interval holding projection is integrally formed on at least one of the bottom of the inner cylinder and the bottom of the outer cylinder, and an engagement section with which the interval holding projection engages is integrally formed on the other. Things.

[0009] The convexity for maintaining the space prevents the bottom of the outer container from being deformed and crushed against the atmospheric pressure. Since the spacing projections are integrated with the inner cylinder or outer cylinder, the number of parts is reduced compared to the case where spacers are used separately from the inner cylinder and the outer cylinder. No additional process is required. In addition, the engagement between the projections for maintaining the gap and the engaging portions allows the inner cylinder and the outer cylinder to be aligned with each other at the time of manufacturing, so that there is no restriction on the structures of the mouth portions of the inner cylinder and the outer cylinder.

According to a second aspect of the present invention, in the heat-insulating cooking container according to the first aspect of the present invention, the space-holding projection is formed in a substantially tapered shape.

[0011] Since the space-holding projections are substantially tapered, the heat transfer distance of the space-holding protrusions between the inner cylinder and the outer cylinder becomes longer, and the transfer of heat from the inner cylinder to the outer cylinder takes place. Fever can be delayed.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the first embodiment of the insulated cooking container of the present invention will be described.
An embodiment will be described with reference to FIGS.
1 is an insulated cooking container body, and the insulated cooking container body 1 is
An outer container 3 having an upper surface as an opening 2 and a synthetic resin bottom member 4 fitted and fixed to the outside of the bottom of the outer container 3 are provided. The outer container 3 is formed by forming a vacuum heat insulating layer 7 between an inner tube 5 and an outer tube 6 made of a metal such as stainless steel, and has a heat insulating property. The inner cylinder 5 and the outer cylinder 6 are connected to each other at the upper end on the opening 2 side. Further, a sealing lid 8 for sealing a hole used for making a vacuum between the inner cylinder 5 and the outer cylinder 6 is joined to the bottom 6a of the outer cylinder 6 by means such as brazing. .
Further, at the center of the bottom 6a of the outer cylinder 6, a spacing holding projection 9 is formed integrally by press-forming or the like by bulging upward, and the upper end of the spacing holding projection 9 is formed inside. Cylinder 5
In contact with the bottom 5a. Further, the cross-sectional shape of the interval maintaining projection 9 is a substantially tapered shape in which the width decreases upward. In addition, the interval maintaining projections 9 may be annularly continuous or may be formed of a plurality of projections. However, as shown in FIG. Has a slit portion 9a. On the other hand, a concave portion 10 as an engaging portion is integrally formed below the bottom portion 5a of the inner cylinder 5 facing the interval maintaining convex portion 9, and an inner peripheral side of the concave portion 10 is provided with the space maintaining portion. The projection 9 is engaged.

An upper frame 11 made of a synthetic resin is fixed to an upper portion of the outer periphery of the outer cylinder 6, and handles 12 are formed on both sides of the upper frame 11 so as to project outward. .

Reference numeral 16 denotes a metal inner container into which food is put. The inner container 16 is housed in the outer container 3 through the opening 2 so as to be freely taken in and out. And
Handles 17 are provided on both upper sides of the inner container 16 respectively. These handles 17 include a metal handle base 18 joined to the inner container 16 and a synthetic resin grip 19 fixed to the distal end of the handle base 18. And the handle base 18
Are formed in a substantially inverted L-shape.
The inner container 16 is supported by placing the 18 on the upper end of the outer cylinder 6 or the inner cylinder 5. In this state, the inner container 16 and the inner cylinder 5 are in a non-contact state. On the other hand, both grips 19
Are located above both handles 12 of the upper frame 11 of the outer container 3, respectively. Further, the upper surface opening of the inner container 16 is closed by a removable inner lid 20. This inner lid 20 is provided with a knob 21 made of synthetic resin at the center of the upper surface.

Reference numeral 26 denotes a lid member.
The inner container 16 is rotatably supported by the outer container 3, and the inner container 16 is stored in the outer container 3.
Is to close. Although the lid member 26 is made of a synthetic resin, a heat insulating material 28 is built in and has heat insulating properties. Reference numeral 29 denotes a clamp for holding the lid member 26 closed with respect to the outer container 3. Also, the lid member 26
In a closed state, the grip 19 of the handle 17 of the inner container 16 is
It is located so as to protrude outward from the lid member 26.

Next, the operation of the above configuration will be described. Since the space holding projection 9 formed integrally with the bottom 6a of the outer cylinder 6 is in contact with the bottom 5a of the inner cylinder 5, vacuum insulation is provided between the inner cylinder 5 and the outer cylinder 6 against atmospheric pressure. The bottom of the outer container 3 on which the layer 7 is formed is prevented from being particularly crushed.

Since the space-holding projection 9 is formed integrally with the outer cylinder 6 by press molding or the like, compared with the case where a spacer made of a member separate from the inner cylinder and the outer cylinder is used as in the related art. The number of parts can be reduced. At the same time, a positioning step such as spot welding, which is different from press forming, is not required in manufacturing, so that the number of assembly steps can be reduced and the cost can be reduced.

The space holding projection 9 of the outer cylinder 6 is
By engaging with the recess 10 of the inner cylinder 5 during manufacturing,
And the outer cylinder 6 can be aligned reliably and easily.
Also, the joining of the outer cylinder 6 by welding or the like can be easily performed. At the same time, since the inner cylinder 5 and the outer cylinder 6 can be positioned before joining the outer cylinder 6, the structure of the mouth portions of the inner cylinder 5 and the outer cylinder 6 can be eliminated. For example, even when the mouth portions of the inner cylinder 5 and the outer cylinder 6 are not flange-shaped as in the related art, but are straight cylindrical shapes, joining and vacuum evacuation can be reliably performed. The recess 10
Is also formed integrally with the inner cylinder 5, so that the effect of reducing the number of parts is not impaired.

Further, a slit portion 9a is formed in a part of the annular interval holding convex portion 9 so that the bottom portions 5a and 5a of the inner cylinder 5 and the outer cylinder 6 are formed.
Between 6a, the closed space between the space-holding convex portion 9 and the concave portion 10 is communicated with the space outside the space so that the space between the space-maintaining convex portion 9 and the concave portion 10 can be evacuated. Easy and reliable.

Further, since the space holding projection 9 is formed in a substantially tapered shape, the heat transfer distance of the space holding projection 9 between the inner cylinder 5 and the outer cylinder 6 becomes longer, and the distance between the inner cylinder 5 and the outer cylinder 6 increases. Can delay the heat transfer to the Therefore, the heat insulating performance of the heat insulating cooking container is improved.

In the above-described first embodiment, the interval-maintaining projection 9 has a square shape. However, as in the second embodiment shown in FIG. May be rounded. Also in this case, it is preferable that the interval maintaining projections 9 have a substantially tapered shape in which the width decreases upward. As in the second embodiment, the heat transfer distance between the inner cylinder 5 and the outer cylinder 6 can be further increased by forming the interval maintaining projections 9 in a curved shape, and the heat insulation performance can be further enhanced.

Also, the shape of the engaging portion with which the interval maintaining protrusion engages can be variously modified. For example, in the third embodiment shown in FIG. 5, the concave portion 31 formed integrally with the inner cylinder 5 as an engaging portion is formed in an annular shape in which the top portion of the interval maintaining convex portion 9 fits. In particular, in this case, it is necessary to prevent air from being left in the concave portion 31 by the interval maintaining convex portion 9. For example, when the interval maintaining projection 9 is formed in an arc-shaped cross section, if a predetermined shape is not formed at the time of press forming, as shown in FIG. A closed space 32 is formed between the space 32 and the convex portion 9, and there is a possibility that air may be left in the space 32 and a problem that a vacuum cannot be obtained may occur. The air left in the space 32 in this way causes a loss of heat insulation. In order to avoid this, as in the fourth embodiment shown in FIG.
It is advisable not to create a closed space inside 31.

Further, in the fifth embodiment shown in FIG. 7, a convex portion 33 as an engaging portion bulging downward is integrally formed on the bottom portion 5a of the inner cylinder 5, and the outer peripheral portion 34 of the convex portion 33 is formed on the bottom portion 5a. The interval holding projection 9 of the outer cylinder 6 is engaged. In the sixth embodiment shown in FIG. 8, an annular convex portion 35 as an engaging portion bulging downward is integrally formed on the bottom portion 5a of the inner cylinder 5, and an inner peripheral portion 36 of the convex portion 35 is formed.
Is engaged with the space holding projection 9 of the outer cylinder 6. on the other hand,
In the seventh embodiment shown in FIG. 9, the interval holding projection 9 is engaged with the outer peripheral portion 37 of the projection 35.

In the second to seventh embodiments, the same functions and effects as those of the first embodiment can be obtained.

Next, an eighth embodiment of the insulated cooking container according to the present invention will be described with reference to FIG. Since the insulated cooking container of the eighth embodiment has substantially the same configuration as the insulated cooking container of the first embodiment, portions corresponding to those of the first embodiment are denoted by the same reference numerals. The description is omitted.
In the eighth embodiment, instead of the bottom 6a of the outer cylinder 6, the interval holding projection 41 is formed integrally with the center of the bottom 5a of the inner cylinder 5 by swelling downward and by press molding or the like. The lower end of the space holding projection 41 is in contact with the bottom 6 a of the outer cylinder 6. In addition, the cross-sectional shape of the space-holding convex portion 41 is a substantially tapered shape in which the width decreases downward. The interval maintaining projection 41 may be annularly continuous or may be formed of a plurality of projections. However, as in the first embodiment, vacuum evacuation is performed at one or more locations. (Not shown). On the other hand, the convex portion 41 for maintaining the interval
A concave portion 42 as an engaging portion is formed integrally with a bottom portion 6a of the outer cylinder 6 facing the outer cylinder 6, and the interval maintaining convex portion 41 is engaged with an outer peripheral portion of the concave portion. As in the eighth embodiment,
The same operation and effect as in the first embodiment can be obtained even if the interval maintaining projection 31 is provided on the inner cylinder 5.

In the case where the space-holding projections are formed on the outer cylinder as in the eighth embodiment, the shape and combination of the space-holding protrusions and the recesses engaged with the space-holding protrusions are the same as those of the second embodiment. Various examples are possible as in the example to the seventh embodiment. In particular, the combination of the convex portions and the concave portions for maintaining the spacing in the third to seventh embodiments may be reversed upside down.

Next, a ninth embodiment of the insulated cooking container of the present invention will be described with reference to FIGS. Reference numeral 51 denotes an insulated cooking container main body.
Is an outer container 53 having an opening 52 at the upper surface, and a synthetic resin bottom member 54 fitted and fixed to the outside of the bottom of the outer container 53.
And The outer container 53 is formed by forming a vacuum heat insulating layer 57 between an inner cylinder 55 and an outer cylinder 56 made of a metal such as stainless steel, and has heat insulation. A receiving portion 58 bulging upward is formed at the center of the bottom 55a of the inner cylinder 55. Further, at the center of the bottom portion 56a of the outer cylinder 56, a spacing holding projection 59 is formed integrally by press molding or the like by swelling upward.
Is in contact with the bottom 55a of the inner cylinder 55. This contact position is the outer peripheral portion of the concave portion 60 as an engaging portion formed below the receiving portion 58. In addition, the cross-sectional shape of the space holding projection 59 is a substantially tapered shape in which the width decreases upward. The interval maintaining projections 59 may be annularly continuous or may be composed of a plurality of projections. However, as in the first embodiment, vacuum evacuation is performed at one or more locations. (Not shown).

An upper frame 61 made of a synthetic resin is fixed to the upper part of the outer periphery of the outer cylinder 56. On both sides of the upper frame 61, both ends of a substantially U-shaped handle 62 are supported. Axis 63
And are rotatably supported.

Reference numeral 66 denotes a metal inner container into which food is put. The inner container 66 is housed in the outer container 53 through the opening 52 so as to be freely taken in and out, and the bottom 55a of the inner cylinder 55 is provided.
And is supported on the receiving portion 58 of the main body. And
On both sides of the upper part of the inner container 66, both ends of a substantially semicircular handle 67 are rotatably supported by a support shaft 68, respectively.
Further, the upper surface opening of the inner container 66 is closed by a removable inner lid 70. The inner lid 70 is provided with a knob 71 made of synthetic resin at the center of the upper surface.

Reference numeral 76 denotes a lid member.
Is rotatably supported by the outer container 53, and this outer container
With the inner container 66 housed in the opening 53, the opening 52 of the outer container 53 is opened.
Is to close. The lid member 76 is made of a synthetic resin, but has a built-in heat insulating material and has heat insulating properties. A handle 79 is provided on the side of the lid member 76 opposite to the hinge 77. Further, receiving projections 80 are provided on both sides of the lid member 76. On the other hand, cutouts 81 are formed at both ends of the handle 62, into which both the receiving projections 80 are inserted. And, when the handle 62 is tilted to one side,
The open portion of the notch 81 is located above the receiving projection 80 so that the cover 76 can be opened and closed. The lid member 76 is positioned above the projection 80 and is locked in a closed state.

Also in the ninth embodiment, the convexity for maintaining the interval is provided.
With the recess 59 and the concave portion 60, the same operation and effect as those of the first embodiment can be obtained. Further, in the ninth embodiment, the interval holding projection 59 also has an effect of receiving the load of the inner container 66 placed on the receiving portion 58 of the bottom 55a of the inner cylinder 55.

Next, a tenth embodiment of the insulated cooking container according to the present invention will be described with reference to FIG. The tenth
Since the insulated cooking container of the embodiment has substantially the same configuration as the insulated cooking container of the ninth embodiment, portions corresponding to those of the ninth embodiment are denoted by the same reference numerals and description thereof is omitted. I do. In the tenth embodiment, instead of the bottom portion 56a of the outer cylinder 56, the interval holding projection 91 is formed at the center of the bottom portion 55a of the inner cylinder 55 by swelling downward and integrally formed by press molding or the like.
The lower end of the space holding projection 91 is in contact with the bottom 56a of the outer cylinder 56. In addition, the cross-sectional shape of the interval maintaining projection 91 is a substantially tapered shape in which the width decreases downward. The interval maintaining projection 91 may be annularly continuous or may be composed of a plurality of projections. However, as in the first embodiment, vacuum evacuation is performed at one or more locations. (Not shown). On the other hand, a concave portion 92 as an engaging portion is formed integrally with the bottom portion 56a of the outer cylinder 56 facing the interval maintaining convex portion 91, and the interval maintaining convex portion 91 is formed on an outer peripheral portion of the concave portion 92. Is engaged. In the tenth embodiment, the same operation and effect as those of the eighth and ninth embodiments can be obtained.

In the ninth and tenth embodiments as well, the shape and combination of the space-holding projections and the engaging portions with which they are engaged are the same as those of the second and seventh embodiments.
As in the embodiment, various things are possible.

Further, the present invention is not limited to the above embodiment, and various modifications can be made. For example, in each of the above embodiments, only one of the inner cylinders 5, 55 and the outer cylinders 6, 56 is provided with the space holding projections 9, 41, 59, 91. It may be provided.

[0035]

According to the heat-insulating cooking container of the first aspect of the present invention, one of the bottom of the inner cylinder and the bottom of the outer cylinder is integrally formed with the space-holding projection contacting the other. The number of parts can be reduced as compared with the case where a spacer is used as a separate member from the cylinder, and the manufacturing process does not require a positioning process such as spot welding.
Cost can be reduced. In addition, since the engagement portion with which the interval maintaining projection is engaged is integrally formed on the bottom of the inner cylinder or the outer cylinder facing the interval maintaining projection, effects such as reduction in the number of parts are impaired. In addition, since the alignment between the inner cylinder and the outer cylinder is facilitated in manufacturing and the alignment between the inner cylinder and the outer cylinder can be performed before joining the inner cylinder and the outer cylinder, the structure of the mouth portion of the inner cylinder and the outer cylinder can be improved. Eliminate restrictions.

According to the insulated cooking container of the second aspect of the present invention,
In addition to the effect of the first aspect of the present invention, since the interval maintaining convex portion has a substantially tapered shape, the heat transfer distance of the interval maintaining convex portion between the inner cylinder and the outer cylinder increases, so that the distance from the inner cylinder increases. Heat transfer to the outer cylinder can be delayed, and therefore, the heat insulation performance is improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of an insulated cooking container according to the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a plan view of the spacing-maintaining convex portion.

FIG. 4 is a cross-sectional view showing the vicinity of a space-holding projection showing a second embodiment of the heat-insulating cooking container of the present invention.

FIG. 5 is a cross-sectional view showing the vicinity of a projection for maintaining a space, showing a third embodiment of the insulated cooking container of the present invention.

FIG. 6A is a cross-sectional view illustrating a problem that may occur when the interval maintaining protrusion of the outer cylinder is engaged with the recess of the inner cylinder;
FIG. 8 is a cross-sectional view of the vicinity of a space-holding projection showing a fourth embodiment of the heat-insulating cooking container of the present invention.

FIG. 7 is a cross-sectional view showing the vicinity of a space-holding projection showing a fifth embodiment of the insulated cooking container of the present invention.

FIG. 8 is a cross-sectional view showing the vicinity of a space-holding projection showing a sixth embodiment of the heat-insulating cooking container of the present invention.

FIG. 9 is a cross-sectional view showing the vicinity of a space-holding projection showing a seventh embodiment of the heat-insulating cooking container of the present invention.

FIG. 10 is a sectional view showing an eighth embodiment of the insulated cooking container of the present invention.

FIG. 11 is a front view, partly in section, showing a ninth embodiment of the insulated cooking container of the present invention.

FIG. 12 is a perspective view of the same.

FIG. 13 is a partially sectional front view showing a tenth embodiment of the insulated cooking container of the present invention.

FIG. 14 is a cross-sectional view showing a problem of a conventional insulated cooking container.

[Explanation of symbols]

 2 Opening 3 Outer container 5 Inner cylinder 5a Bottom of inner cylinder 6 Outer cylinder 6a Bottom of outer cylinder 7 Vacuum insulation layer 9 Spacing maintaining protrusion 10 Concave part (engagement part) 16 Inner container 26 Lid member 31 Concave part (engagement) Part) 33 Convex part (engagement part) 35 Convex part (engagement part) 41 Spacing part convex part 42 Depression (engagement part) 52 Opening 53 Outer container 55 Inner cylinder 55a Inner cylinder bottom 56 Outer cylinder 56a Outer Cylinder bottom 57 Vacuum insulation layer 59 Spacing projection 60 Depression (engagement part) 66 Inner container 76 Lid member 91 Spacing maintenance projection 92 Depression (engagement part)

Claims (2)

[Claims] 1. An outer container having a heat insulating property in which a vacuum heat insulating layer is formed between an inner cylinder and an outer cylinder, an inner container housed in the outer container through an opening thereof so as to be freely taken in and out, and the contents thereof. A heat-insulating cooking container having a heat-insulating lid member that closes the opening of the outer container in a state in which the container is stored, wherein at least one of the bottom of the inner cylinder and the bottom of the outer cylinder has an interval. A heat-insulating cooking container, wherein a holding projection is integrally formed, and an engaging portion with which the interval-holding projection is engaged is integrally formed on the other. 2. The heat-insulating cooking container according to claim 1, wherein said space-maintaining convex portion has a substantially tapered shape.