JP6163178B2 - Thermal insulation container - Google Patents

Description

  The present invention relates to a heat insulation container that retains liquid with an open / close lid that opens and closes an opening of a container body, and in particular, air flows into the heat insulation container by operating a vent plug provided in an inner plug of the open / close lid. Thus, the opening / closing lid can be easily rotated in the opening direction.

Conventionally, in a warming container that keeps warm liquid such as soup and miso soup, the inside of the container becomes negative pressure over time, making it difficult to open the opening and closing lid, so it is difficult to open the opening and closing lid. The following techniques that have been facilitated are known (see, for example, Patent Documents 1 to 3).
That is, in the prior art described in Patent Document 1, the lid body is provided with a screwed body provided with a screwed portion to be screwed to the container main body, and an upper opening of the container main body disposed inside the screwed body. The sealing body is suspended from the screwed body so as not to be detached, and is provided on the screwed body so as to be movable in the vertical direction and to be freely rotatable. When the lid is opened, the sealing body does not rotate with the screwed body even if the screwed body is rotated in the opening direction. Is locked to the retaining engagement portion and the sealing body is removed together with the screwed body.

The sealing body has a structure in which a vent hole communicating with the inside of the container body is provided and a valve body that opens and closes the vent hole is provided, and the valve body is provided with a push operation portion that performs a push operation. The lower portion is provided with a vent hole closing portion that closes the opening portion of the vent hole.
An urging body is provided between the push operation portion and the vent hole blocking portion, and the push operation portion is pushed against the urging force of the urging body to push down and move the vent hole blocking portion downward. The opening of the vent is opened by opening the air hole closing part into the container body, and when the pushing operation of the pushing operation part is released, the pushing operation is performed by the return bias of the biasing body. The vent part is pushed up and the vent hole closing part moves upward to automatically close the vent hole, so that the valve body can be pushed even when the pressure in the container body is negative. As a result, the air vent is opened and the inside of the container body is in communication with the outside, and air flows into the container body and the pressure inside the container body changes from the negative pressure state to the normal pressure, and the sealed body adheres. It is configured to relax the state.

In addition, the prior art described in Patent Document 2 is provided with an inner lid that closes the upper opening of the heat insulation container body and is provided with an elastic waterproof packing that is detachably provided in the upper opening, and is detachably provided on the heat insulation container body. The outer lid covers the outside of the inner lid and has an outer lid that can be pressed against the inner lid. The inner lid is provided with an air passage that communicates with the inside and outside, and the air passage can be closed inside the outer lid via a packing holding member. A simple air passage closing packing is detachably attached.
When opening the lid, the air lid closing packing inside the outer lid is first separated from the inner lid by opening the outer lid, the sealing of the air hole in the inner lid is released, and the inside of the heat insulating container body is in a decompressed state. However, the outside air is introduced into the inside through the air holes and returns to the normal pressure state, so that the outer lid can be opened smoothly, and the inner lid is also released from the reduced pressure state and can be easily lifted.

Further, in the conventional technique described in Patent Document 3, an inner lid with a packing attached to the periphery is placed on the mouth of the container body, and the outer lid is screwed onto the container body from above, thereby A pressure body is pressed and fixed to the mouth of the container main body, a vent hole is provided in the center of the inner lid, and a valve body made of an elastic body fitted into the vent hole is mounted on the lower surface of the center portion of the outer lid.
Then, to open the closed container in the negative pressure state, when the outer cover and the container body are loosened, the valve body is gradually separated from the inner cover together with the outer cover, and the outside air passes through the vent hole to the inside of the container. After the negative pressure is eliminated and the outer lid is removed, the inner lid can be easily removed without applying force.

Japanese Patent No. 5607112 Japanese Patent No. 4756480 Japanese Utility Model Publication No. 61-1772

The conventional technique described in Patent Document 1 can release the negative pressure state by pushing the valve body, relax the tightness of the sealing body, and can easily remove the lid body from the container body. The vent hole closing portion of the valve body that opens and closes the vent hole is positioned in the sealing material provided at the peripheral edge of the vent hole by the biasing force of the biasing body (coil spring) to close the vent hole, By pushing the valve body against the urging force, the valve body is positioned below the sealing material to open the vent hole.
Therefore, in order to securely close the vent hole closing portion of the valve body in the sealing material and close the vent hole, it is necessary to increase the biasing force of the biasing body and to open the vent hole. Since a predetermined descending distance of the vent hole blocking portion has to be ensured, there has been a problem that considerable force is required for the pushing operation of the valve body.

Further, in the conventional technique described in Patent Document 1, the sealing body is suspended from the screwed body in a retaining state by the retaining locking part of the sealing body and the retaining engagement part of the screwed body. An air flow gap is formed between the retaining engagement portion and the retaining engagement portion, so that the heat of the soup and the like in the container body is sealed because it is necessary to provide the screwed body so that it can be moved in the vertical direction and idle. It passed through the body and was emitted from the air circulation gap, and there was a problem that the heat retaining property was poor.
Next, in the conventional technique described in Patent Document 2, by opening the outer lid, first, the air passage closing packing inside the outer lid is separated from the inner lid, the sealing of the air hole of the inner lid is released, and the outer lid is removed. It can be opened smoothly and then the inner lid can be lifted easily because it is released from the reduced pressure state. However, because the outer lid and the inner lid are separated, soup is stored in the insulation container body. When doing so, put the soup etc. in the heat insulation container body and attach the inner lid and the outer lid separately, and when eating soup etc., you must remove the outer lid and the inner lid separately, There was a problem that handling was troublesome.

Further, in the conventional technique described in Patent Document 2, when the outer lid is screwed to the outer peripheral surface of the upper opening of the heat retaining container body, the elastic water-stopping packing of the inner lid and the air passage blocking packing provided inside the outer lid Must be sealed at the same time, making it difficult to design the structure of both packings.
Next, according to the prior art described in Patent Document 3, when the screwing of the outer lid and the container body is loosened, the valve body is gradually separated from the inner lid together with the outer lid, the negative pressure is eliminated, and the outer lid is removed. After that, the inner lid can be easily removed without applying a force, but the outer lid and the inner lid must be separately attached to and detached from the container body as in the conventional technique described in Patent Document 2. However, there was a problem that handling was troublesome.

In addition, the conventional technique described in Patent Document 3 has an opening on the upper surface of the outer lid as in the conventional technique described in Patent Document 1, so that heat that has passed through the inner lid is easily dissipated, and heat retention is poor. There was a problem.
Therefore, the present invention is intended to solve such problems of the prior art, and the open / close lid is composed of an outer lid, an inner plug, a vent plug, and a fixture. An object of the present invention is to make it possible to easily turn the opening / closing lid in the opening direction by operating air vent plugs provided in the inner plug when the plug is opened to allow air to flow into the heat insulating container.

The heat retaining container of the present invention according to claim 1 is a heat retaining container for warming a liquid comprising a container body having an opening at an upper end and an opening / closing lid for opening and closing the opening.
The container body forms a first male screw on the upper outer periphery,
The opening / closing lid includes an outer lid, an inner plug, a vent plug, and a fixture,
The outer lid includes a first female screw threadedly engaged with a first male screw of the container body formed on the inner side of the side periphery, a circular hole formed at the center of the top, and an inner engagement formed on the inner periphery of the circular hole. With a joint,
The inner plug is in close contact with the inner periphery of a cylindrical inner plug body having a gap with the inner side of the outer peripheral side of the outer lid and having an annular space inside, and the inner periphery of the container body provided on the lower outer periphery of the inner plug body A first packing, a vent hole formed through the top and bottom in the center of the inner plug body, a second female screw formed on the inner periphery of the vent hole, and an upper portion formed at the center of the top of the inner plug body. A protruding first cylindrical portion, an outer engaging portion that engages with an inner engaging portion of the outer lid formed on the outer periphery of the first cylindrical portion, and a third female screw formed on the inner periphery of the first cylindrical portion And
The vent plug includes a vent plug body having an operation knob formed at an upper end thereof, a second packing for closing the vent hole provided below the vent plug body, and the second female screw formed in the middle of the vent plug body. And a second male screw threaded onto
The fixing member is formed on an annular portion whose inner periphery is located outward of the second female screw of the vent hole, a second cylindrical portion protruding below the annular portion, and an outer periphery of the second cylindrical portion. A third male screw threadedly engaged with the third female screw of the first cylindrical portion, and the inner plug is engaged with the outer engagement portion from the lower side of the outer lid. Thus, the third male screw can be fixed by being screwed onto the third female screw.

  The heat retaining container of the present invention according to claim 2 is the same as the structure of the heat retaining container according to claim 1, and the inner engaging portion of the outer lid and the outer engaging portion of the inner plug are the same on the peripheral surface. An uneven tooth mold with a pitch is formed parallel to the vertical direction.

  According to a third aspect of the present invention, there is provided the heat retaining container according to the first aspect of the present invention. A lower end hole smaller in diameter than the first female screw, and the vent plug is formed in a tapered shape so that the second packing is in close contact with the stepped portion and the lower end protrudes from the lower end hole of the inner plug. It is a thing.

  In addition to the structure of the heat insulating container according to any one of claims 1 to 3, the heat insulating container according to a fourth aspect of the present invention is configured such that the operation knob of the vent plug is positioned inside the second cylindrical portion of the fixture. The disk part formed in such a manner, and three finger pads extending radially from the center above the disk part.

  According to a fifth aspect of the present invention, in addition to the configuration of the thermal insulation container according to any one of the first to fourth aspects, the open / close lid includes an outer lid, an inner plug main body, a first packing, and a vent. The stopper body, the second packing, and the fixture can be disassembled and cleaned.

The effect of the heat insulating container of the present invention according to claim 1 is that the container body has a first male screw formed on the outer periphery of the upper part, and the opening / closing lid includes an outer lid, an inner plug, a vent plug, and a fixture. The outer lid includes a female screw threadedly engaged with the male screw of the container body formed inside the side peripheral portion, a circular hole formed in the center of the top portion, and an inner engaging portion formed on the inner periphery of the circular hole. The inner plug has a cylindrical inner plug body having a gap with the inner side of the outer peripheral side of the outer lid and having an annular space inside, and a inner wall of the container body provided on the lower outer periphery of the inner plug body. One packing, a vent hole formed through the top and bottom of the inner plug body, a second female screw formed on the inner periphery of the upper portion of the vent hole, and a first projecting upward formed at the center of the top portion of the inner plug body A cylindrical portion, an outer engaging portion that engages with an inner engaging portion of the outer lid formed on the outer periphery of the first cylindrical portion, and an inner periphery of the first cylindrical portion A vent plug is provided between the vent plug main body having an operation knob formed at the upper end, a second packing for closing a vent hole provided below the vent plug main body, and the vent plug main body. A second male screw threadably engaged with the formed second female screw, and the fixture protrudes below the annular portion with an annular portion whose inner periphery is located outside the first female screw of the vent hole A second cylindrical part, and a third male screw threadedly engaged with a third female thread of the first cylindrical part formed on the outer periphery of the second cylindrical part. Since the third male screw can be fixed to the third female screw while being engaged with the engaging part, it can be fixed. By assembling the open / close lid together, it is easy to handle the open / close lid to the container body. The first and second packings can be sealed separately and reliably. Than is possible.
Moreover, when opening the opening / closing lid, the vent plug is first turned in the opening direction, so that the negative pressure state in the container body can be easily and reliably eliminated.

  In addition to the effect of the heat insulation container of the present invention according to claim 1, the effect of the heat insulation container of the present invention according to claim 2 is that the inner engagement portion of the outer lid and the outer engagement portion of the inner plug are peripheral surfaces. Since the concave and convex tooth molds of the same pitch are formed in parallel in the vertical direction, the opening and closing lid can be integrated easily and accurately by assembling the inner plug from the inside of the outer lid and screwing it with a fixture. However, the lid can be easily disassembled.

  In addition to the effect of the heat insulation container of the present invention according to claim 1 or 2, the effect of the heat insulation container of the present invention according to claim 3 is that the vent hole of the inner plug forms a step portion at the lower end of the second female screw. A lower end hole smaller in diameter than the second female screw is formed in the part, and the vent plug is formed in a tapered shape so that the second packing is in close contact with the stepped part and the lower end protrudes from the lower end hole of the inner plug. It is possible to further ensure the sealing by the air hole plugs.

  The effect of the heat retaining container of the present invention according to claim 4 is the effect of the heat retaining container of the present invention according to any one of claims 1 to 3, and the operation knob of the vent plug is disposed inside the second cylindrical portion of the fixture. Since the disc portion formed so as to be located at the top and the three finger contacts extending radially from the center above the disc portion, the opening / closing operation of the vent plug can be further simplified.

  The effect of the heat insulating container of the present invention according to claim 5 is the effect of the heat insulating container of the present invention according to any one of claims 1 to 4, and the opening / closing lid includes an outer cover, an inner plug main body, and a first packing. In addition, since it is possible to disassemble and clean the vent plug main body, the second packing, and the fixture, all the members constituting the open / close lid can be kept clean.

It is a perspective view of the heat insulation container which concerns on embodiment of this invention. FIG. 2 is an exploded perspective view of FIG. 1. It is a longitudinal cross-sectional view of the heat retention container which concerns on embodiment of this invention of FIG. It is a disassembled perspective view which decomposes | disassembles and shows the inner stopper main body which concerns on embodiment of this invention into an upper main body and a lower main body. It is an expansion longitudinal cross-sectional view of the 1st packing which concerns on embodiment of this invention. It is drawing which shows the operation state of the vent plug which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 6 are drawings according to an embodiment of the present invention, FIG. 1 is a perspective view of a heat insulation container, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is a longitudinal sectional view of the heat insulation container, and FIG. FIG. 5 is an enlarged longitudinal sectional view of the first packing, and FIG. 6 is an operation state diagram of the vent plug.

1 to 3, reference numeral 1 denotes a heat retaining container that retains warm liquid such as soup and miso soup. The heat retaining container 1 includes a container body 2 having an opening 21 at the upper end, and an opening / closing lid 3 that opens and closes the opening 21. And.
The inner volume of the heat insulating container 1 is about 400 mm with an inner diameter of about 75 mm and a height of about 90 mm.

As shown in FIG. 3, the container main body 2 is made of stainless steel and has an outer cylinder 22 having a bottom, an inner cylinder 23, a vacuum layer 24 between them, and a resin mounting provided on the bottom of the outer cylinder 22. The opening 21 is formed by joining the upper ends of the outer cylinder 22 and the inner cylinder 23.
Further, the outer cylinder 22 in the container body 2 has a first male screw 26 formed on the upper outer periphery, and the inner cylinder 23 in the container body 2 bulges the inner periphery 20 mm below the upper end inwardly to form an annular bulge. A portion 27 is formed.

The opening / closing lid 3 includes an outer lid 4, an inner plug 5, a vent plug 6, and a fixture 7.
The outer lid 4 is made of polypropylene, a first female screw 42 that is screwed with the first male screw 26 of the container body 2 formed inside the side peripheral portion 41, a circular hole 44 formed in the center of the top portion 43, And an inner engagement portion 45 formed on the inner periphery of the circular hole 44.

The inner engagement portion 45 of the outer lid 4 has a plurality of circular holes 44 formed in a cylindrical portion 44a having a height of 5 mm and formed on the inner peripheral surface of the cylindrical portion 44a in parallel in the vertical direction at the same pitch. It is an uneven tooth mold 45a.
As shown in FIG. 3, the inner plug 5 includes a cylindrical inner plug body 51 having a gap with the inner side of the side peripheral portion 41 of the outer lid 4 and an annular space 51 a therein, and a lower portion of the inner plug body 51. A first packing 52 closely attached to the inner periphery of the bulging portion 27 of the container body 2 provided on the outer periphery, and a vent hole 53 formed through the top and bottom in the center of the inner plug body 51 as shown in FIG. A second female screw 54 formed on the inner periphery of the pore 53, a first cylindrical portion 55 projecting upward formed at the center of the top of the inner plug body 51, and an inner side of the outer lid 4 formed on the outer periphery of the first cylindrical portion 55 An outer engaging portion 56 that engages with the engaging portion 45 and a third female screw 57 formed on the inner periphery of the first cylindrical portion 55 are provided.

The outer engagement portion 56 formed on the outer periphery of the first cylindrical portion 55 of the inner plug body 51 in the inner plug 5 is a large number of concave and convex tooth molds 56 a formed in parallel in the vertical direction at the same pitch. It engages with the engaging portion 45 (uneven tooth mold 45a).
As shown in FIG. 3, the vent hole 53 in the inner plug body 51 of the inner plug 5 forms a stepped portion 58 projecting inwardly at the lower end of the second female screw 54, and the stepped portion 58 has the second female screw 54. A 5 mm lower end hole 59 having a smaller diameter than the inner diameter of the thread is formed.

Further, the inner plug main body 51 is made of polypropylene, and as shown in FIGS. 3 and 4, is formed of an upper main body 51b and a lower main body 51c, and has four arcuate shapes provided on the inner periphery of the upper main body 51b. The protrusion 51d is elastically deformed and fitted into an annular groove 51e provided on the outer periphery of the lower main body 51c, thereby preventing heat dissipation from the inner plug 5 so as to have the annular space 51a therein and storing soup and the like. The heat insulation performance of things is improved.
The first packing 52 provided on the lower outer periphery of the inner plug main body 51 is made of silicone rubber. As shown in FIG. 5, an inner peripheral groove 52a is formed in the center inner periphery in the height direction, and the thickness direction center in the lower end is formed. An annular lower end groove 52b is formed on the inner side of the lower end groove 52b.

And the annular protrusion 51f is formed in the lower outer periphery of the lower main body 51c in the inner plug main body 51, and the first packing 52 is engaged by engaging the inner peripheral groove 52a of the first packing 52 with the annular protrusion 51f of the lower main body 51c. Is detachably fixed to the inner plug main body 51.
The vent plug 6 includes a vent plug body 61, an operation knob 62 formed at the upper end of the vent plug body 61, and a second packing 63 made of silicone rubber that closes the vent hole 53 provided below the vent plug body 61. And a second male screw 64 screwed into the second female screw 54 formed in the middle of the vent plug body 61.

As shown in FIG. 6, the operation knob 62 of the vent plug body 61 in the vent plug 6 includes a disk part 62a and three finger pads 62b extending radially from the center above the disk part 62a. A thumb, an index finger and a middle finger are applied to the 62 finger contacts 62b so that the vent plug 6 can be opened and closed.
The vent plug 6 operates the operation knob 62 with the second male screw 64 as the second female screw 54 to bring the second packing 63 into close contact with the stepped portion 58 of the vent hole 53 of the inner plug 5, and the lower end 65 is located in the middle. It is formed in a tapered shape so as to protrude from the lower end hole 59 of the plug 5, and the sealing of the vent hole 53 by the vent plug 6 is ensured.

The fixture 7 includes an annular part 71 having an inner periphery located outside the second female screw 54 of the vent hole 53, a second cylindrical part 72 projecting inwardly below the annular part 71, A third male screw 73 screwed into the third female screw 57 of the first cylindrical portion 55 formed on the outer periphery of the two cylindrical portions 72, a flange portion 74 extending downward from the periphery of the annular portion 71, and the annular portion 71 And a plurality of radial recesses 75 for preventing finger slipping during operation.
Then, the fixing tool 7 is configured in such a manner that the inner plug 5 is engaged with the outer engagement portion 56 (uneven tooth shape 56a) from the lower side of the outer lid 4 with the inner engagement portion 45 (uneven tooth shape 45a). The inner plug 5 can be fixed to the outer lid 4 by screwing the male screw 73 with the third female screw 57.

As shown in FIG. 3, the disk portion 62 a of the operation knob 62 in the vent plug 6 is formed so as to be located inside the second cylindrical portion 72 of the fixture 7.
Next, the operation of the heat retaining container 1 according to the embodiment of the present invention will be described.

First, as shown in FIG. 2, the opening / closing lid 3 is disassembled into an outer lid 4, an inner plug body 51, a first packing 52, a vent plug body 61, a second packing 63, and a fixture 7. These and the container body 2 are cleaned and sterilized to be clean.
Then, the first packing 52 is fixed to the inner plug body 51 to be the inner plug 5, the second packing 63 is fixed to the ventilation plug body 61 to be the ventilation plug 6, and the ventilation plug 6 is screwed to the inner plug 5. The inner plug 5 and the outer lid 4 are fixed with a fixture 7 to form an opening / closing lid 3.

In addition, the second male screw 64 of the vent plug body 61 in the vent plug 6 is screwed into the second female screw 54 of the vent hole 53 of the inner plug body 51, so that the vent hole 53 is reliably secured by the second packing 63 of the vent plug 6. The opening / closing lid 3 with the vent hole 53 sealed can be obtained.
An appropriate amount of a warm liquid such as soup is poured into the container body 2 and the open / close lid 3 is screwed to make the heat-insulating container 1 sealed.

The first female screw 42 of the outer lid 4 in the opening / closing lid 3 is screwed into the first male screw 26 of the opening 21 of the container body 2, so that the opening 21 is reliably sealed by the first packing 52 of the inner plug body 51. be able to.
And when eating and drinking the liquid in the heat insulating container 1, first, if the vent plug 6 is turned in the opening direction, the second male screw 64 and the second female screw 54 are loosened, so that the vent plug 6 can be removed. The air flows into the heat insulating container 1, the atmospheric pressure in the heat insulating container 1 becomes atmospheric pressure, and the opening / closing lid 3 can be easily removed from the container body 2 by turning the opening / closing lid 3 in the opening direction.

In the above embodiment, the inner engagement portion of the outer lid and the outer engagement portion of the inner plug are formed by the concave-convex tooth shape, but may be a plurality of protrusions and concave portions.
In the above embodiment, the vent hole of the inner plug is formed with a step portion at the lower end of the second female screw, and the lower end hole is formed with a smaller diameter than the second female screw at the step portion. Is formed in a tapered shape so that the lower end protrudes from the lower end hole of the inner plug. However, the air hole can be replaced with various structures that can be sealed by the second packing.

In the above embodiment, the operation knob of the vent plug includes a disk part formed so as to be located inside the second cylindrical part of the fixture, and three finger pads extending radially from the center above the disk part. Although provided, it can be replaced with an operation knob of another structure that can open and close the vent plug.
In the above embodiment, the open / close lid can be cleaned by disassembling the outer lid, the inner plug body, the first packing, the vent plug body, the second packing, and the fixture, The outer lid and the inner plug body may be fixed so that they cannot be disassembled.

DESCRIPTION OF SYMBOLS 1 Thermal insulation container 2 Container main body 21 Opening part 26 1st external thread 3 Opening / closing lid 4 Outer cover 41 Side peripheral part 42 1st internal thread 43 Top part 44 Circular hole 45 Inner engagement part 45a Concavity and convexity type 5 Medium plug 51 Medium plug body 51a Annular space 52 First packing 53 Vent hole 54 Second female screw 55 First cylindrical portion 56 Outer engagement portion 56a Concavity and convexity die 57 Third female screw 58 Step portion 59 Lower end hole 6 Vent plug 61 Vent plug main body 62 Operation knob 62a Disk portion 62b Finger pad 63 Second packing 64 Second male screw 65 Lower end 7 Fixing tool 71 Annular portion 72 Second cylindrical portion 73 Third male screw

Claims (5)

In a heat retaining container that retains the temperature of a liquid provided with a container body having an opening at the upper end and an opening / closing lid that opens and closes the opening
The container body forms a first male screw on the upper outer periphery,
The opening / closing lid includes an outer lid, an inner plug, a vent plug, and a fixture,
The outer lid includes a first female screw threadedly engaged with a first male screw of the container body formed on the inner side of the side periphery, a circular hole formed at the center of the top, and an inner engagement formed on the inner periphery of the circular hole. With a joint,
The inner plug is in close contact with the inner periphery of a cylindrical inner plug body having a gap with the inner side of the outer peripheral side of the outer lid and having an annular space inside, and the inner periphery of the container body provided on the lower outer periphery of the inner plug body A first packing, a vent hole formed through the top and bottom in the center of the inner plug body, a second female screw formed on the inner periphery of the vent hole, and an upper portion formed at the center of the top of the inner plug body. A protruding first cylindrical portion, an outer engaging portion that engages with an inner engaging portion of the outer lid formed on the outer periphery of the first cylindrical portion, and a third female screw formed on the inner periphery of the first cylindrical portion And
The vent plug includes a vent plug body having an operation knob formed at an upper end thereof, a second packing for closing the vent hole provided below the vent plug body, and the second female screw formed in the middle of the vent plug body. And a second male screw threaded onto
The fixing member is formed on an annular portion whose inner periphery is located outward of the second female screw of the vent hole, a second cylindrical portion protruding below the annular portion, and an outer periphery of the second cylindrical portion. A third male screw threadedly engaged with the third female screw of the first cylindrical portion, and the inner plug is engaged with the outer engagement portion from the lower side of the outer lid. The heat retaining container can be fixed by screwing the third male screw into the third female screw.   The heat retaining container according to claim 1, wherein the inner engagement portion of the outer lid and the outer engagement portion of the inner plug are formed with concave and convex tooth molds having the same pitch on the peripheral surface in parallel in the vertical direction. .   The vent hole of the inner plug forms a step at the lower end of the second female screw and forms a lower end hole having a smaller diameter than the second female screw at the step, and the vent plug attaches the second packing to the second packing The heat-retaining container according to claim 1 or 2, wherein the heat-retaining container is formed in a tapered shape so that the lower end protrudes from the lower end hole of the inner plug.   The operation knob of the vent plug includes a disk part formed so as to be positioned inside the second cylindrical part of the fixture, and three finger pads extending radially from the center above the disk part. The heat insulation container according to any one of claims 1 to 3.   5. The opening / closing lid is disassembled into an outer lid, an inner plug main body, a first packing, a vent plug main body, a second packing, and a fixture, and can be cleaned. The heat insulation container in any one of.

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