JP2011235934A - Heat-insulating food vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the deterioration of a warmth-retaining property caused by heat convection in a heat-insulating vessel.SOLUTION: An outer lid 10 is mounted at the upper opening 1A of the heat-insulating vessel 1so as to be openable and closable, and inner vessels 5, 12 and 13 are accommodated therein. An inner lid 17 is mounted to the inner vessel body 16 of the inner vessel 5 so as to be openable and closable via a packing material 22. There is mounted a shielding wall 6 protruding from the packing material 22 in the outer circumferential direction and capable of contacting with the inner circumferential surface 2A of the heat-insulating vessel 1. The inner circumferential surface 2A of the heat-insulating vessel 1 has a portion of an inner diameter B that does not contact with the upper side of a portion of an inner diameter A with which the shielding wall 6 contacts. The space is shielded by the shielding wall 6 into the inner vessel 5 including the heat-insulated inner lid 17 and the inner vessel 13 side in the heat-insulating vessel 1, so that it is possible to suppress the deterioration of the warmth-retaining function by reducing the heat convection.

Description

  The present invention relates to a heat-insulated food container such as a heated lunch box that carries a bento while keeping the temperature.

  Conventionally, as this kind, two or more inner containers consisting of at least an upper stage and a lower stage are stacked in a vertical direction inside a heat insulating container forming a main body of a heat insulation lunch box, and the inner container is an inner container. An inner lid is provided at the upper opening of the main body through a packing material so as to be freely opened and closed. And in such a prior art, the fixed clearance gap is set to the outer surface of a cylindrical heat insulation container and the inner container, respectively.

  Further, in an inner container such as a rice cooker having a good volumetric efficiency to the heat insulating container, in order to clarify the closed state of the inner lid, a built-up portion is provided in the radial direction on the outer surface of the inner lid, and this meat There is known one that causes a click feeling when the raised portion passes over the convex rib on the inner side surface of the container body (for example, Patent Document 1).

Japanese Patent No. 2986886

  In the conventional technique, a constant gap is set between the inner surface of the heat insulating container and the outer surface of the inner container, and this gap becomes a space where heat convection is generated from the inner container storing the food that is kept warm, There is a risk of heat loss to the opening of the insulated container.

  In addition, when a built-up portion and a convex rib are provided for the click feeling, the click feeling is greatly affected by the manufacturing tolerance of each component, and adjustment to maintain a constant torque value is difficult. Also, in the insulated container configuration, the outer diameter of the container and the inner diameter of the insulated container are finished tolerances, so a certain amount of gap is necessary, but such a gap also causes heat loss as described above. Become.

  A problem to be solved is that in a heat-insulated food container in which an inner container of food is stored in a heat-insulated container, it is possible to prevent a decrease in heat retention due to heat convection in the heat-insulated container. In addition, even when the inner lid of the inner container is in a normal position, a click feeling due to uneven fitting is generated, so that the manufacturing dimension tolerance of each part can be set relatively low.

  According to the first aspect of the present invention, the inner container is housed in a heat-insulating container in which the outer lid is provided in the upper opening so as to be freely opened and closed, and the inner container is provided in the inner container body so that the inner lid can be opened and closed through a packing material. In the insulated food container, the insulated food container is characterized in that a blocking wall that protrudes from the packing material in the outer circumferential direction and that can contact the inner circumferential surface of the insulated container is provided.

  The invention according to claim 2 is the heat insulated food container according to claim 1, wherein the packing material is made of an elastic ring and is interposed between the upper opening of the inner container body and the inner lid.

  The invention according to claim 3 is the insulated food container according to claim 2, characterized in that the inner peripheral surface of the heat insulating container has a large diameter portion where the blocking wall does not contact and a small diameter portion where the blocking wall contacts. is there.

  According to the first aspect of the present invention, the convection space in the heat insulating container can be blocked by the blocking wall to reduce the heat convection and suppress the decrease in the heat retaining function.

  According to the invention of claim 2, since the elastic body is used for the blocking wall, the blocking wall can be brought into deformation contact with the inner peripheral surface of the heat insulating container.

  According to invention of Claim 3, the contact resistance of the interruption | blocking wall at the time of taking in / out of an inner container can be reduced.

It is a longitudinal cross-sectional view which shows Example 1 of this invention. It is a longitudinal cross-sectional view which shows Example 2 of this invention.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all of the configurations described below are not necessarily essential requirements of the present invention.

  FIG. 1 shows Example 1, and a heat insulating container 1 forming a main body of a heat insulation lunch box is formed by joining and integrating a bottomed cylindrical inner cylinder 2 and a bottomed cylindrical outer cylinder 3 at its mouth. The upper opening 1A is formed in a wide opening having substantially the same diameter as the inner cylinder 2 and a vacuum between the inner cylinder 2 and the outer cylinder 3 serves as a vacuum heat insulating space 4. Has a double structure. The inner diameter of the inner cylinder 2 is the smallest at the first inner diameter A where the blocking wall 6 of the second inner container 5 described later is disposed, and the second inner diameter B (B <A) above the position of the inner diameter A. The inner diameter is formed to the same diameter A below the portion of the inner diameter A. A bottom member 7 is attached to the bottom of the outer cylinder 3. Furthermore, stoppers 8 are provided at two locations corresponding to both ends in the diameter direction of the upper opening 1 </ b> A of the outer cylinder 3 of the heat insulating container 1. The front end of the stopper 8 is pivotally connected to a shoulder member 9 whose base end is fixed to the outer periphery of the upper opening, and is formed in a substantially U shape or a substantially inverted U shape.

  The outer lid 10 that closes the upper opening 1A of the heat insulating container 1 has a relatively shallow bottomed cylindrical shape, and can be externally fitted to the shoulder member 9 from above. The receiving portions 11 of the stopper 8 are provided at two locations corresponding to both ends of the.

  Inside the heat insulating container 1 with the upper opening 1A closed by the outer lid 10, there are a first inner container 12, a second inner container 5, and a third inner container 13 for storing food in the vertical direction. Are stacked and stored. In the embodiment, the first inner container 12 is housed inside the outer lid 10, and the third inner container 13 placed on the bottom of the inner cylinder 2 and the second inner container 13 on the third inner container 13. The inner container 5 is accommodated in the heat insulating container 1.

  The first inner container 12 is obtained by externally fitting a first inner lid 15 to the upper opening 14A of the bottomed first inner container main body 14, and the first inner lid 15 is the outer lid 10's. It faces the top.

  The second inner container 5 is obtained by inserting the inner bottom of the second inner lid 17 into the upper opening 16A of the second inner container body 16 having a bottom, and the second inner lid 17 is a dish-shaped top. The bottom surface of the plate portion 18 is joined to each other so that the upper edge of the concave bottom plate portion 20 is abutted, and the air gap formed between the two is used as an air layer or has a heat insulating layer 21 filled with a heat insulating material. The bottom plate portion 20 is mounted in a state of being inserted into the upper opening portion 16A of the second inner container body 16. An elastic ring 22 having a ring-shaped flat surface as a packing material is attached to the entire outer periphery of the second inner lid 17. The cross-sectional shape of the elastic ring 22 is a U-shape that is open on the inside, and the upper side portion 23 in the horizontal direction is fitted to the edge side of the upper surface of the upper plate portion 18, and the upper side portion 23 extends in the vertical direction. The vertical side portion 24 is opposed to the inner peripheral surface 2A at the first inner diameter A of the inner cylinder 2, and the inner side of the horizontal lower side portion 25 connected to the lower side of the vertical side portion 24 is the upper side surface of the bottom plate portion 20. The edge of the upper opening portion 16A abuts upward from below on the outer edge side of the lower surface of the lower side portion 25 appearing outside. Further, a shallow concave portion 26 is formed inwardly at the lower portion of the side surface of the bottom plate portion 20, and a small protrusion 27 inserted into the concave portion 26 when the second inner lid 17 is closed has a second inner container. It is formed on the inner surface of the main body 16, and when the second inner lid 17 is closed in the normal position, the bottom plate portion 20 gets over the small protrusion 27 and the concave portion 26 and the small protrusion 27 are fitted to provide a click feeling. Can be produced.

  The upper surface of the upper plate portion 18 is formed with a substantially central recess, and the recess 28 protrudes upward to take out the second inner container 5 from the heat insulating container 1. Part 29 is provided.

  And the said blocking wall 6 which protrudes in an outer peripheral direction and can contact the inner peripheral surface 2A of the heat insulation container 1 in the upper part of the vertical side part 24 is provided. The blocking wall 6 is provided along the entire circumference of the elastic ring 22, and the distal end side, that is, the inner peripheral surface 2 A side of the heat insulating container 1 is tapered from the base end of the blocking wall 6, that is, the vertical side portion 24 side. It is formed to become. Accordingly, when the center of the heat insulating container 1 is the axis, the first inner diameter A of the inner peripheral surface 2A with which the blocking wall 6 abuts and the entire width of the blocking wall 6 disposed on the entire circumference of the second inner lid 17. Or the outer diameter C is slightly larger than the first inner diameter A.

  The third inner container 13 is provided with a third inner lid 31 detachably attached to the upper opening 30A of the bottomed third inner container body 30 by a screw 32, and the center of the second inner lid 17 is provided. An air valve 33 is provided.

  Next, the operation of this embodiment will be described. First, from the state shown in FIG. 1, the stopper 8 is vertically rotated downward and removed from the receiving portion 11. Then, the outer lid 10 is removed upward.

  Next, the 3rd inner container 13, the 2nd inner container 5, and the 1st inner container 12 which accommodated the foodstuff (not shown) are accommodated so that it may accumulate on the heat insulation container 1 one by one. In the second inner container 5, the second inner lid 17 is arranged so that the bottom plate portion 20 side is inserted into the second inner container body 16 after the food is stored in the second inner container body 16. When the base plate 20 is closed, a click feeling is obtained by fitting the concave portion 26 and the small projection 27 after the bottom plate portion 20 gets over the small projection 27, and it can be sensed that the lid is closed at the normal position.

  Then, the outer lid 10 is fixed by rotating the outer lid 10 and rotating the stopper 8 in the closed state to be engaged with the receiving portion 11. In this heat retaining state, the blocking wall 6 provided on the second inner lid 17 contacts the inner peripheral surface 2A of the first diameter portion, and the inside of the inner cylinder 2 is vertically moved with the blocking wall 6 as a boundary. And the heat insulation layer 21 is provided on the second inner lid 17, so that the heat insulation space in the heat insulation container 1 is substantially sealed below the second inner lid 17. Even if thermal convection occurs below, small thermal convection occurs in the lower part of the inner cylinder 2 partitioned by the blocking wall 6, and a decrease in heat retention performance due to thermal convection can be prevented.

  Then, the stopper 8 is removed from the receiving portion 11, the outer lid 10 is opened, and the first inner container 12, the second inner container 5, and the third inner container 13 are sequentially taken out from the upper opening 1A and used.

  As described above, in the embodiment, the convection space of the heat insulating container 1 can be blocked by the blocking wall 6 of the elastic ring 22 so as not to be connected to the upper opening 1A of the heat insulating container 1, thereby suppressing heat loss. be able to. Thereby, the heat insulation of the 2nd inner container 5 and the 3rd inner container 13 which are lower positions than the accommodated blocking wall 6 can be maintained higher. Moreover, since the elastic body is used for the blocking wall 6, the blocking wall 6 can be deformed and brought into contact with the inner peripheral surface 2 </ b> A of the heat insulating container 1, and it is possible to easily cope with the shielding of the non-uniform convection space. .

  Further, the second inner container 5 is blocked by making the first diameter A forming the inner diameter portion 2B of the inner cylinder 2 with which the blocking wall 6 contacts slightly smaller than the second inner diameter B of the inner cylinder 2. The contact resistance of the wall 6 can be reduced. At a location B of the second diameter such as the vicinity of the upper opening 1A of the heat insulating container 1 at the beginning of storage of the second inner container 5, the second inner container 5 is moved further inside without contact resistance of the blocking wall 6. The first diameter A of the inner cylinder 2 is smaller than the diameter C of the blocking wall 6 immediately before the final leaving position of the second inner container 5, and the diameter C and the first diameter A are By setting it as the same dimension, the interruption | blocking wall 6 closely_contact | adheres to the inner peripheral surface 2A of the heat insulation container 1, and the heat insulation space is interrupted and fixed. The second inner container 5 does not move in the heat insulating container 1 when being carried because the elastic barrier 6 of the second inner container 5 is firmly fixed to the heat insulating container 1, and in particular, the food in the second inner container 5 is biased. Etc. can be prevented.

  Further, as in the embodiment, when the second inner lid 17 is closed, the click feeling due to the fitting between the small protrusion 27 on the second inner container body 16 side and the concave portion 26 on the second inner lid 17 is achieved. In such a case, the upper opening 16A of the second inner container 5 is in contact with the elastic ring 22, and the elastic ring 22 is deformed and absorbed in response to the change in the closeness. Therefore, the click feeling can be stabilized by controlling the click feeling between the second inner container body 16 and the second inner lid 17 in the vertical direction. Further, the packing material is formed by the elastic ring 22, and the blocking wall 6 is provided in a protruding shape on the vertical side portion 24 of the elastic ring 22, so that the upper opening portion 16 </ b> A of the second inner container body 16 becomes the vertical side portion 24. In this case, since the elastic deformation increases, a larger tolerance can be absorbed.

  FIG. 2 shows a second embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, a case is shown in which a large-capacity inner container 5 'is provided in the heat-insulating container 1, and a small-capacity inner container 12' is stacked and stored on the upper part, and the lid 17 of the large-capacity inner container 5 'is shown. 'Is provided with a shielding wall 6'. Further, the outer lid 10 ′ can be attached by being externally fitted to the shoulder member 9. Then, by forming a small notch 34 in a part of the shielding wall 6 ′, when the inner cylinder 2 is stored in the inner cylinder 2 and the inner cylinder 2 is in a reduced pressure state, Since the upper and lower portions can be communicated with each other by the notch 34, the atmosphere is introduced downward through the notch 34, so that the decompressed state is eliminated and the large-capacity inner container 5 'can be easily taken out. Is.

  As described above, the insulated food container according to the present invention can be applied to various uses.

DESCRIPTION OF SYMBOLS 1 Heat insulation container 1A Upper opening part 2A Inner peripheral surface 2B Small diameter part 5 2nd inner container 6 Barrier wall
10 outer lid
17 Second inner lid
22 Elastic ring (packing material)

Claims (3)

  The inner container is housed in a heat-insulating container having an openable and closable outer cover at the upper opening, and the inner container is a heat-insulated food container having an inner cover that can be opened and closed via a packing material on the inner container body. A heat insulating food container, characterized in that a shielding wall that protrudes from the material in the outer peripheral direction and that can contact the inner peripheral surface of the heat insulating container is provided.   The insulated food container according to claim 1, wherein the packing material is made of an elastic ring and is interposed between the upper opening of the inner container body and the inner lid.   3. The insulated food container according to claim 2, wherein an inner peripheral surface of the heat insulating container has a large diameter portion that does not contact the blocking wall and a small diameter portion that contacts the blocking wall.

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