JPS6349234Y2 - - Google Patents

Description

[Detailed description of the invention] This invention has a vacuum insulation layer on the outer periphery, can efficiently keep the contents warm, has a simple structure, can be manufactured easily and inexpensively, and can be used for multiple purposes. This relates to a metal double-ended thermos flask that is capable of

Conventionally, a metal double-ended thermos flask having a structure shown in FIG. 1 has been proposed. As shown in the figure, this metal double-ended thermos includes a double-ended vacuum insulated double cylinder 1 with a vacuum between an inner cylinder 1d and an outer cylinder 1e, and a bottom opening of the double-ended vacuum insulated double cylinder 1. 1a, an inner container 3 inserted and fixed into the double-ended vacuum insulated double cylinder 1, and a mouth 3a of the inner container 3 inserted into the top of the double-ended vacuum insulated cylinder 1. An outer plug 4 is fixed to the opening 1b, and a thread is formed on the inner circumferential surface of the mouth 3a of the inner container 3, so that an inner plug 6 can be screwed onto it. There is.

The double-ended double-ended vacuum insulated cylinder 1 is formed by stacking pipes of different diameters, their respective ends hermetically joined, and forming a vacuum heat insulating layer 1c between the pipes. This double-ended vacuum insulated cylinder 1
The materials are 1 large diameter pipe, 1 small diameter pipe, and 1 each.
In addition, each pipe has good dimensional accuracy using a pipe-making machine, making it easy to mass-produce leak-free pipes.There is also less scrap produced during the manufacturing process, which reduces material costs and allows for low-cost manufacturing. can.
In addition, in this double-ended double-ended vacuum insulated tube 1, only two joints are required to create an airtight structure, at both ends, and the structure at both ends also allows for secure jointing, so no leakage may occur in the finished product. The probability of this occurring is low, and the product is highly reliable.

The outer stopper bottom 2 and the outer stopper 4 are made of plastic,
Since it is made of a material with low thermal conductivity such as paper or wood, less heat is allowed to escape from the double-ended vacuum insulated cylinder 1, and less heat from the outside is allowed to enter inside. Therefore, it is possible to maintain the temperature of the contents in the inner container 3 at a predetermined level for a long time.

Further, the inner container 3 is usually made of plastic,
It is formed into a bottle shape using a material such as paper that has low thermal conductivity and good formability, and a rib 3b is formed at the bottom of the bottle so as to contact the outer stopper bottom 2 in a small area. In order to further improve the heat retention performance of such a thermos flask, it has been proposed to form a recess 2a on the inner container 3 side of the outer stopper bottom 2 and to arrange the heating element 5 in the recess 2a.

That is, the heating element 5 increases the temperature of the space S between the inner cylinder 1d of the double-ended vacuum insulated double cylinder 1 and the inner container 3, so that the temperature of this space S and the temperature inside the inner container 3 are increased. This is provided in order to minimize the difference between the inner container 3 and the inner container 3, or to increase the temperature in the space S to prevent the heat in the inner container 3 from escaping to the outside. Note that when the heat of the heating element 5 is actively used to heat the contents of the inner container 3, it is said that it is desirable that the inner container is made of a highly thermally conductive material such as metal.

With the above configuration, the metal double-ended thermos flask has the following features:
It has high heat retention. In addition, this metal thermos can be easily disassembled into the double-ended vacuum insulated cylinder 1, the outer stopper bottom 2, the inner container 3, and the outer stopper 4, so the inner container 3 can be cleaned. Moreover, if the inner container 3 is formed into a wide-mouth bottle shape, it can be used not only as a thermos flask but also as a lunch jar, etc., making it versatile.

As mentioned above, conventional metal double-ended thermos flasks are
Although it is multifunctional and has various advantages, it has the following difficulties and inconveniences, and solutions to these problems are desired.

That is, the heating element 5 is a double-ended vacuum insulated cylinder 1 at both ends.
The temperature of the space S between and the inner container 3 is increased, and this space S
This is provided to minimize the heat escaping to the outside through the heating element. However, since the space S is relatively narrow, convection necessary for heat conduction is difficult to occur, and the temperature of the space S is lower than that of the heating element. Only the area around 5 has increased, and it has not been possible to increase the overall value. Therefore, heat tends to escape from a relatively low-temperature location in the space S. Further, as described above, since the temperature near the heating element 5 particularly increases, it is necessary to limit the materials used for the members near the heating element 5.

Further, even if the temperature of the space S is increased, the inner cylinder 1d of the double-ended vacuum insulated double cylinder 1 remains at a relatively low temperature, and this inner cylinder 1d is made of metal with high thermal conductivity. Therefore, the heat in the space S is absorbed by the inner cylinder 1d, and the temperature in the space S cannot be raised efficiently.

This idea was made in view of the above circumstances,
The purpose is to provide a metal double-ended thermos flask that is easy to disassemble, easy to clean the inner container, easy to maintain the heating element, and further improves the heat retention of the contents.

In order to achieve such a purpose, the present invention integrates a metal outer cylinder and a metal inner cylinder inserted into the metal outer cylinder at the upper and lower parts, and provides a vacuum insulation layer between the inner cylinder and the outer cylinder. A double-ended vacuum-insulated double cylinder is formed by forming a double-ended vacuum-insulated cylinder, a threaded portion is formed at the top and bottom of this double-ended vacuum-insulated double-ended cylinder, and an outer plug is screwed onto the upper end of the double-ended vacuum-insulated double-ended cylinder. At the same time, the bottom of the outer stopper is screwed onto the lower end, and the mouth is supported by the outer stopper inside the double-ended vacuum insulated double cylinder, and the inner container is housed with the bottom supported by the bottom of the outer stopper with a space between them. On the other hand, it is a metal double-ended thermos flask in which a heating element is installed on the upper surface side of the bottom of the outer stopper at a distance from the bottom surface of the inner container, and the heating element and the inner cylinder wall of the double-ended vacuum-insulated double bottle are connected to each other. are connected by a material with good thermal conductivity.

This invention will be explained below with reference to the drawings. FIG. 2 shows a first embodiment of this invention, and parts common to those in FIG. 1 are given the same reference numerals to simplify the explanation. Reference numeral 10 in the figure indicates a good heat conductive member, and this good heat conductive member 10 is made of a material with high heat conductivity such as an aluminum thin plate.
It is formed in a long plate shape and is disposed on the upper surface of the heating element 5 so as to cross the center of the heating element 5.
Both ends 10a and 10b are held between the bottom opening 1a of the double-ended vacuum insulated tube 1 and the bottom 2 of the outer stopper, respectively. Therefore, this good heat conductive member 10 contacts the heating element 5 at its center,
Its both ends 10a and 10b are in contact with the inner cylinder 1d of the double-ended vacuum insulated cylinder 1. Therefore,
The heat of the heating element 5 is quickly transferred to the inner cylinder 1d of the double-ended vacuum insulated cylinder 1 through the well-thermal conductive member 10, and the transferred heat spreads evenly to the inner cylinder 1d. The temperature of the entire space S between the cylinder 1d and the inner container 3 is uniformly raised. As a result, the difference between the temperature of the space S and the temperature inside the inner container 3 becomes small, and moreover, from the viewpoint of heat flow, the difference between the temperature of the space S and the temperature inside the inner container 3 becomes smaller.
The movement of heat from the inner cylinder 1d toward the inner cylinder 1d is reduced, and heat intrusion from the outside is blocked by the higher temperature inner cylinder 1d, so that the temperature inside the inner container 3 is maintained at a high level for a long time. can do. Therefore, the space S between the double-ended vacuum insulated cylinder 1 and the inner container 3 is narrow, and heating by thermal convection in the space S cannot be expected, and the surrounding area of the heating element 5 tends to be heated selectively. Even with a certain thermos flask, it is possible to satisfactorily heat the inner cylinder 1d from the lower side to the upper side, and there is an effect that the entire inner container 3 can be heated efficiently. Furthermore, if a high-heating element is used as the heating element 5, the temperature can also be easily increased. Furthermore, as described above, the heat of the heating element 5 is quickly transported by the highly thermally conductive member 10, so that only the vicinity of the heating element 5 does not reach a particularly high temperature. Therefore, it is possible to widen the selection range of materials used for members near the heating element 5.

In addition, an outer plug 4 is attached to the upper end of the double-ended vacuum insulated double cylinder 1.
Since the outer plug 4 and the outer plug bottom 2 are screwed together and the outer plug bottom 2 is screwed to the lower end, the outer plug 4 and the outer plug bottom 2 can be rotated and removed from the double-ended vacuum insulated tube 1. This allows the thermos flask to be disassembled, and the good heat conductive member 10 does not get in the way when the outer stopper bottom 2 is rotated and removed. Therefore, the above-mentioned good heat retention properties can be maintained without impairing the ease with which this type of thermos flask can be disassembled. Therefore, the thermos of the invention has excellent heat retention for the contents stored in the inner container 3, and the thermos itself can be easily disassembled, so that the inner container 3 of the thermos flask can be cleaned and the inner container 3 can be replaced. Furthermore, since the heating element 5 is separated from the inner container 3,
When the outer stopper bottom 2 is removed from the double-ended vacuum insulated cylinder 1, maintenance such as replacing the heating element 5 can be easily carried out.

FIG. 3 shows a second embodiment of this invention, and parts common to FIGS. 1 and 2 are given the same reference numerals to simplify the explanation. In the figure, code 11
indicates a highly thermally conductive member, and this highly thermally conductive member 11 is made by bending a thin plate-like elastic member into a hook shape with steps, and one end surface of the material is formed by bending a thin plate-like elastic member into a hook shape with steps.
The other end is abutted against the heating element 5 with a predetermined biasing force. The material of this good heat conductive member 11 is required to have predetermined elasticity and thermal conductivity, and also to be able to be joined to the inner cylinder 1d. Stainless steel, which is the same material as tube 1, can be used.

With the above structure, it is possible to obtain the same effects as in the first embodiment, and moreover, by simply fitting the outer stopper bottom 2 into the bottom opening 1a of the double-ended vacuum insulated double cylinder 1, Since the heat generating element 5 can be fixed by the highly thermally conductive member 11 and the thermal connection between the heat generating element 5 and the inner cylinder 1d is completed, assembly can be made easier.

As explained above, the metal double-ended thermos according to this invention reduces the heat of the heating element by connecting the heating element and the inner cylinder of the double-ended vacuum insulated cylinder with a good thermal conductive member. This structure increases the overall temperature of the space between the inner cylinder and the inner container by transmitting the heat to the double-ended vacuum-insulated inner cylinder through the inner cylinder, further improving heat retention. .

Therefore, even if the space between the double-ended vacuum insulated cylinder and the inner container is narrow, and the structure is such that heating by heat convection cannot be expected in the space, and the surrounding area of the heating element tends to be heated selectively, The inner cylinder can be heated well from the lower side to the upper side, and the entire inner container can be heated efficiently.

In addition, since the outer cap is screwed onto the top end of the double-ended vacuum insulated double tube and the bottom of the outer cap is screwed onto the bottom end, the thermos can be easily removed by removing the outer cap and the bottom of the outer cap. In addition to being able to be disassembled, the good heat conductive material does not get in the way when the bottom of the outer stopper is rotated and removed from the double-ended vacuum insulated cylinder.
Therefore, in addition to being excellent in heat retention for the contents, the inner container of the thermos flask can be cleaned and replaced without impairing the easy disassembly feature of this type of thermos flask. Furthermore, since the heating element is separated from the inner container, maintenance such as replacing the heating element can be easily carried out when the bottom of the outer stopper is removed from the double-ended vacuum insulated tube. be.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional diagram showing a conventional metal double-ended thermos flask, Figure 2 is a cross-sectional diagram showing a first embodiment of this invention, and Figure 3 is a cross-sectional diagram showing a second embodiment of this invention. FIG. 1... Double-ended vacuum insulation cylinder, 1a... Bottom opening, 1c... Vacuum insulation layer, 1d... Inner cylinder, 1e...
... Outer cylinder, 2 ... Outer stopper bottom, 2a ... Recess, 3 ... Inner container, 5 ... Heat generating element, 10, 11 ... Good thermal conductive member, S ... Space.

Claims (1)

[Scope of utility model registration request] A metal outer cylinder and a metal inner cylinder inserted inside it are integrated at the upper and lower parts, and a vacuum insulation layer is formed between the inner cylinder and the outer cylinder to form a double-ended vacuum insulation cylinder,
Threaded parts are formed at the top and bottom of this double-ended vacuum insulated double cylinder, an outer plug is screwed onto the top end of the double-ended vacuum insulated double cylinder, and the bottom of the external plug is screwed onto the bottom end of the double-ended vacuum insulated cylinder. The mouth part is supported by the outer plug inside the mouth vacuum insulated double cylinder, and the bottom part is supported by the bottom of the outer plug with a gap between them, leaving a space between it and the inner circumferential surface of the double mouth vacuum insulated double cylinder. This is a metal double-ended thermos flask in which an inner container is housed, and a heating element is installed on the upper surface side of the bottom of the outer stopper, spaced apart from the bottom surface of the inner container, and the heating element and both ends are vacuum-insulated double tubes. A metal double-ended thermos flask, characterized in that the inner cylinder wall of the flask is connected to the inner cylinder wall of the flask via a highly thermally conductive member.