JP2002330871A - Electric hot water storage vessel having heat insulating vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily observe a high water level indicator and to be safely used even if reducing the inside diameter of a mouth part of an heat insulating vessel and enhancing the heat insulating force. SOLUTION: This electric hot water storage vessel has a heat insulating vessel 3 in a vessel body 1, has a heater 11 applied to a non-insulated bottom part 3c of the heat insulating vessel 3 from the outside, an formed with the small and stop-shaped mouth part 3a whose inside diameter is smaller than that of a trunk part 2b, in the heat insulating vessel 3. This vessel displays a high water level indicator 67a on a projecting surface 4n projecting inward of the inside diameter surface of the trunk part 2b in a high water level 67 so as to attain the purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric hot water storage container having various heat insulating containers such as a vacuum double container made of metal, and is used, for example, for an electric pot for home use.

[0002]

2. Description of the Related Art Electric pots are widely used in homes, offices, cafeterias, and the like, and are sometimes in use all the time.
On the other hand, as energy conservation is called out in terms of environmental issues and resource saving, high power consumption by heaters in electric pots has been targeted for improvement.

In view of the above, an electric pot having a metal vacuum double container a as shown in FIG. 20 has been conventionally provided, and boiling is performed to the extent that the heat retention is improved by the vacuum space b of the vacuum double container a. The power consumption of the heater c when the heated content liquid is kept at a predetermined temperature is reduced.

In the conventional electric pot shown in FIG. 20, a narrowed portion f with an inner cylinder e projecting inward at a mouth portion d of a vacuum double container a, and a vacuum space b of a body portion wrapped around a bottom portion are particularly provided. And an outer case h containing such a vacuum double container a to form a container i, and an opening communicating with an opening d of the vacuum double container a in the container i. j is provided with a cover k which covers it and extends to the mouth d of the vacuum double container a. This makes it possible to secure a normal heat-retaining state of about 90 ° C. that can be practically used even when two hours have elapsed after the heating by the heater c is stopped after boiling. Incidentally, the inner diameter of the mouth portion d is set to about 145 mm.

[0005]

However, while the thermos bottle warming mode in which the heating by the heater c is not performed is put to practical use, further improvement of the warming power is desired. Therefore, the present inventors have repeatedly conducted various experiments and studied repeatedly. As a result, it was found that the larger the area of the vacuum space b around the vacuum double container a, the higher the heat retaining effect, and that the heat of the content liquid closed the lid k. Even if it is, it is easy to escape upward from the mouth d of the vacuum double container a, and the smaller the size, the better the heat retention. This is common to various heat insulating containers having heat insulating walls or heat insulating structures other than the vacuum double container.

On the other hand, in the case of an electric pot, a safety space p for spontaneous discharge is provided above the heat insulating container. This is to prevent the inner opening n of the vapor passage m provided in the lid k from being blocked due to expansion, boiling, or swaying or tilting of the liquid surface caused by heating of the content liquid. In order to secure the safety space p, a full water level is set, and a full water level index r indicating the position to the user is provided.

However, as the inner diameter of the mouth portion d is reduced to increase the heat retaining power as described above, the water level indicator r becomes more difficult to be seen from the outside even when the lid k is opened, and the water level index r exceeds the water level. It may be used in the state where it was put. In such a case, the content liquid closes the vapor passage m, and the vapor cannot escape to the outside, causing abnormal pressure rise and spontaneous discharge, which is dangerous.

An object of the present invention is to provide an electric hot water storage container having an insulated container which is easy to use even when the heat retaining capacity is increased by reducing the inner diameter of the mouth of the insulated container and which is safe to use.

[0009]

In order to achieve the above-mentioned object, an electric hot water storage container having an insulated container according to the present invention has an insulated container in a body, and a heater is provided on the non-insulated bottom of the insulated container from outside. In the case where the inner diameter of the mouth is smaller than the inner diameter of the body in the heat-insulated container, the water level indicator is displayed on the protruding surface that protrudes inward from the inner diameter of the body at the water level. This is one of the features.

In such a configuration, the inner diameter of the mouth exerts a higher heat-retaining power on the heat insulating container than the inner diameter of the body,
Since the heater heats the content liquid at the non-insulated bottom, it can be heated with high thermal efficiency.In addition, since the full water level indicator corresponding to the full water level is provided on the protruding surface that protrudes inward from the inner diameter surface of the trunk, The protruding surface is close to the inner diameter surface of the mouth by the amount of the protruding surface protruding from the inner diameter surface of the body recessed with respect to the opening of the mouth, and it is difficult to hide in the aperture shape that can be visually recognized from the outside, and The view range from the outside expands. This allows
Even if the inner diameter of the mouth is smaller than before, the full water level indicator is not easily seen from the outside and is easily used safely, so that it is suitable for enhancing the heat retaining power.

The amount of protrusion of the protruding surface may be smaller than the difference between the inner diameter of the mouth and the inner diameter of the body, or the protruding surface may be aligned with the inner diameter surface of the mouth or extend straight therefrom. The larger the protruding amount, the wider the visible range becomes, and the more easily it is seen. Further, the protruding surface may be provided on a part around the inner surface of the heat insulating container or may be provided in an annular shape. When provided in an annular shape, the diameter of the safety space from the full water level to the opening end of the mouth becomes narrower by the amount of the protrusion of the protruding surface, and it is possible to suppress that the safety space becomes too large and heat can easily escape, and The area of the liquid in contact with the air is reduced, so that heat does not easily escape to the upper part, which also increases the heat retaining power.

In view of the relationship between the position of the mouth and the full water level indicator and its visibility as described above, it is preferable that the amount of protrusion of the projecting surface be increased in proportion to the inner diameter of the mouth.

The electric hot water storage container having the heat insulating container according to the present invention also has a heat insulating container in the body, a heater is applied to the non-insulated bottom of the heat insulating container from the outside, and the inner diameter of the heat insulating container has a torso portion. In the case of forming a throttle-shaped mouth portion smaller than the inner diameter, the position of the full water level indicator provided at the full water level on the inner surface of the insulated container is within the visible range extending outward from the full water level indicator through the mouth contour of the heat insulating container. Another feature is that the setting is made to include the position of the eyes of the user who looks at the operation panel provided on the upper surface of the front part of the container.

[0014] In such a configuration, the inner diameter of the mouth exerts a higher heat retaining power than the inner diameter of the body in the heat insulating container, and
The heater heats the content liquid at the non-insulated bottom, so that it can be heated efficiently.In addition, the electric hot water storage container with the lid opened rearward has a front side of the operation panel to show the whole inside and outside view. It is best for the operator to be located, and to replenish the contents, it is located at the front of the electric water storage container, so that it is not disturbed by the lid to pour the kettle with a dominant hand from the side and the operation panel The standard position of the user's eyes during such work is the standard position when looking at the operation panel or a position close to the standard position. Is likely to be included in the visible range extending to the mouth, and it is only necessary to adjust a little if it comes off.The full water level indicator is easy to see regardless of the difference in the inside diameter of the mouth, and it is easy to use safely, so make the inside diameter of the mouth small To increase heat retention It is suitable.

Except for the case where the above-mentioned protruding surface extends straight from the inner diameter surface of the mouth, the mouth starts to squeeze the inner diameter surface of the body at a position about 5% of the total capacity of the heat insulating container from the water filling level. When this is done, it is possible to prevent the safety space above the full water level from becoming too large and heat from easily escaping upward.

In each of the above-mentioned inventions, when the heat insulating container is a metal vacuum double container, the bending rigidity and the strength are high, so that the wall thickness and the vacuum space layer are small and slim, and exhibit a high heat retaining power while being slim. When the material is stainless steel, the thermal conductivity is low, and the heat retention is further improved.

In this case, in particular, the inner diameter of the mouth is 120 to 1
When it is 40 mm, the inner diameter of the conventional electric pot is 145 mm as described above, but without the danger that the full water level index becomes difficult to see as in each of the above inventions.
Even if the inner diameter is 140 mm or less, the heating of the heater is stopped after boiling even if the inner diameter is 140 mm, and the temperature of the content liquid after 2 hours has passed is about 92 ° C., which is the medium temperature keeping temperature, and the heat retaining power is improved as compared with the related art. To the lower limit of about 120 mm, the medium temperature insulation temperature of 92 ° C and the high temperature insulation temperature of 98 ° C
The temperature is about 95 ° C., which is an intermediate quasi-cooling / remaining temperature, which further improves the heat retaining power and can further save energy. Moreover, the inner diameter of 140 mm is only 3.45% smaller than the conventional inner diameter of 145 mm, and the lower limit of 120 mm
In this case, the reduction is only 18.24%. Therefore, even if it is formed of the same material as in the conventional case, the workability of the drawn shape is not particularly reduced, and the reliability and the cost are not particularly different from those of the conventional case.

The limit of the inside diameter of an adult person's hand, especially a fist, is about 80 mm, which is sufficiently larger than that of a person's hand, so that cleaning and wiping can be easily performed as before. It can be used, and it is easy to take in and out processing tools and processing tools such as guns and sprays that perform blasting and fluorine coating on the surface, and there is no inconvenience in surface processing and processing operations. In addition to keeping the heater warm without heating, a manual pump such as a bellows pump is built into the lid of the body to pressurize and extrude the liquid content without power supply. Although a pump having a capacity that can be secured is required, it is possible to prevent the lid with the built-in pump from being inserted into the mouth even with the minimum inner diameter of 120 mm to prevent the lid from protruding outside the body and becoming large.

Further objects and features of the present invention will become apparent from the following detailed description and drawings. Each feature of the present invention can be used alone or in combination in various combinations as far as possible.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to FIGS.
The present invention will be described in detail with reference to FIGS.

This embodiment is an example of a household electric pot, and has a basic structure in which a vacuum double container made of stainless steel is accommodated in an outer case of a heat insulating container. However, the present invention is not limited to this, and the use, the material and structure of the heat insulating container, and the presence or absence of the outer case can be freely selected. However, stainless steel has low thermal conductivity among metals, has sufficient bending rigidity and strength, and has a rust-preventive effect, and is therefore suitable for an electric hot water storage container for beverages.

As shown in FIG. 1, the electric pot of this embodiment is a metal vacuum double container 3 composed of a stainless steel inner cylinder 4 and an outer cylinder 5, and a liquid in the inner cylinder 4. Single bottom 3 as non-insulated part of vacuum double container 3 so as to heat
and a heater 11 applied to the outer case 2 made of a synthetic resin. As described above, since the vacuum double container 3 is made of a metal having high bending rigidity and high strength, the wall thickness and the layer of the vacuum space 63 are small and slim, while exhibiting a high heat retaining power in combination with the material. . However, the vacuum double container 3 may be configured such that its body is exposed to the outside to form the container 1. A discharge path 25 for discharging the content liquid to the outside of the container 1 is connected to the single bottom portion 3c of the vacuum double container 3, and the discharge path 25 rises between the vacuum double container 3 and the outer case 2 to form the container. The discharge port 25d faces the front part of No. 1. An electric pump 26 is provided in the middle of the discharge path 25 so that the content liquid can be discharged electrically. At the same time, a manual bellows pump 50 is attached to the lid 13 which covers the opening 12 of the container 1 communicating with the mouth 3a of the vacuum double container 3 so that the opening 12 can be opened and closed.
Is provided, and pressurizing air is blown into the vacuum double container 3 by a pressing operation by the pressing plate 61 to pressurize the content liquid, thereby discharging the discharge passage 25.
And extruded to the outside.

The rising portion 25a of the discharge path 25 is a transparent tube, and the liquid volume there is displayed on the liquid volume display window 6 of the body 1 shown in FIG.
2 so that you can see through. However, the liquid amount of the content liquid can be detected and displayed stepwise by a photocoupler or the like in the rising portion 25a, and used as liquid amount data for various controls. Further, the automatic detection of the liquid amount may be performed by a capacitance method,
The liquid amount can also be automatically detected based on the temperature rise characteristics when heating in step 1 and the temperature decrease characteristics when heating of the heater 11 is stopped.

By the way, when the boiling liquid is left in the electric pot having the vacuum double container 3 without being heated by the heater 11, the heat retention characteristics in the thermos holding state are shown in FIG. It is almost inversely proportional to the size of the inner diameter D of 3a. The line indicates the temperature drop width of the content liquid after 2 hours, and is about 5 ° C. for 120 mm, about 10 ° C. for 145 mm, and about 17 ° C. for 180 mm.

Therefore, the inner diameter D of the mouth 3a is set to
When the thickness is set to less than 2 mm, it is possible to temporarily improve the heat retaining power, which is the object of the present invention, and from the viewpoint of increasing the heat retaining power, the mouth 3
It is preferable to minimize the inner diameter D of a. But,
It has limitations. For example, considering that the inside of the vacuum double container 3 is to be cleaned and wiped, it is limited to about D = 80 mm for an adult person's hand, particularly a fist to enter, and to work when D = about 100 mm. Easy to do, D
If it exceeds about 120 mm, work becomes free. When the relationship between the inner diameter D and the quality of careability is determined, the result is shown by the line in FIG.

The portion of the lid 13 containing the bellows pump 50 is inserted into the opening 3a as an entrance 13a as shown in FIGS. It is possible to keep heat away from the outside of the mouth 3a as much as possible to prevent heat from escaping to the upper part and to prevent the lid 13 containing the bellows pump 50 from protruding significantly outward, but to secure a discharge flow rate that is practically acceptable. When the inside diameter D is less than 120 mm, it is difficult to make the entrance portion 13a enter the mouth 3a with respect to the bellows pump 50.
Since 0 can be arranged only on the mouth 3a, the lid 13 protrudes greatly outward, which causes the electric pot to become large. When the relationship between the inner diameter D of the mouth portion 3a and the quality of miniaturization is evaluated, the relationship is shown by a line in FIG.

The portion where the inside diameter D of the mouth 3a is smaller than the body is formed by drawing. However, the smaller the inside diameter of the mouth 3a, the more difficult it is to draw. It is necessary to weld them together to increase the cost, and even if the drawing process can be performed, the yield and reliability decrease due to cracks, etc., but even if the yield and reliability can be secured, it takes time to process It may cause cost increase. For example, JIS SUS304,
For the inner cylinder 4 made of a material such as SUS436,
By drawing from 80 mm, the inner diameter D of the mouth 3a is 1
When aiming at 20 mm or less, it is necessary to separate and process the body and the drawn portion. When the relationship between the inner diameter D and the quality of processing due to the difficulty of processing is evaluated, the relationship is as shown by a line in FIG.

Further, in order to apply a fluorine coating or a polishing treatment to the inner surface of the inner cylinder 4, instruments such as a gun and a nozzle must be inserted, and in order to perform the treatment uniformly, the instruments may be freely moved. is necessary. Therefore, the mouth 3a
The smaller the inner diameter D, the more difficult the process is, and even if the process can be performed, there is a problem that it takes time and the process cannot be performed uniformly. Further, in the step of blasting the inner surface before the fluorine coating to roughen the surface to increase the adhesive force of the fluorine coat layer, the blast material blown into the inner cylinder 4 is hard to return to the outside of the inner cylinder 4, and the workability is deteriorated. For example, when the inner diameter D of the mouth 3a is less than 100 mm, the gun for spraying the coating material does not enter the inner cylinder 4 and the fluorine coating becomes impossible. When the relationship between the inner diameter D and the quality of processing and processing of the inner surface of the inner cylinder 4 is evaluated as being good or bad, the result is shown by a line in FIG.

Comprehensively judging the relationship between the heat retention characteristics shown in the above-mentioned lines and various good and bad properties, it is easy to maintain, reduce the size, draw and cost, and process and process the inner surface of the inner cylinder 4. Easiness is the limit that can be satisfied 1
It is preferable that the lower limit of the inner diameter D be 20 mm. Also,
As described above, when the inner diameter D is 140 mm, the temperature drop width after about 2 hours is about 8 ° C., and the content liquid temperature is still about 92 ° C., which is 2 hours after the conventional case where the inner diameter D is 145 mm. This is preferable because the temperature reduction width is about 10 ° C., and the temperature of the content liquid is usually about 90 ° C., since sufficient improvement in the heat retaining power is seen. In the case of an electric pot with a capacity of 3L, the power saving was about 6,500 yen per year,
When the inner diameter D is 140 mm, if the energization of the heater 11 is stopped until the content liquid reaches the same practical warming temperature of about 90 ° C. as in the conventional case, power saving of over 7000 yen is achieved. This is 3
The product price will be reached in a year and the price will be recovered.

However, factors that determine the upper limit of the inner diameter D include, in addition to the various characteristics of the actually measured data, public energy saving standards, user's desired items such as a user card and Internet information, and air conditioners, televisions, refrigerators, and the like. There are various factors such as comparison with power consumption with other home appliances and energy saving rate.

As described above, when the inner diameter D of the mouth portion 3a is made smaller than that of the related art in order to increase the heat retaining power, the vapor of the lid 13 is immersed in the upper part of the vacuum double container 3 as shown in FIG. The full water level indicator 67a corresponding to the full water level 67 for leaving the above-mentioned safety space 100 for leaving the above-mentioned safety space 100 for the vapor passage 17 to be released to the outside so as not to be blocked by the content liquid is used. When the water level indicator 67a is provided on the inner diameter surface of the body portion 3b, the full water level indicator 67a becomes deeper from the edge of the mouth portion 3a because the inner diameter D of the mouth portion 3a becomes smaller than before, making it difficult to see from the outside. Therefore, it is difficult to secure use.

To cope with this, in the present embodiment, the full water level indicator 67a is displayed on the protruding surface 4n that protrudes inward from the inner diameter surface of the body 2b at the full water level 67. In the example shown in the figure, a full water level indicator 67a is formed on a part of the partially protruded protruding surface 4n as an inwardly protruding line. However, the display mode can be freely selected other than the line, and the display may be stamped so as to be protruded to the outside, or may be a post-installation method such as painting or printing.

As described above, since the water level indicator 67a corresponding to the water level 67 is provided on the inner surface of the body 2b, that is, on the protruding surface 4n which protrudes inward from the inner surface of the body of the inner cylinder 4, the mouth height is increased. The protruding surface 4n protrudes from the inner diameter surface of the body portion 2b, which is recessed with respect to the opening edge of the portion 3a. Difficult to hide, Figure 2 from outside through the mouth 3a
The viewing range θ shown in FIG. Therefore, even if the inner diameter of the mouth 3a is smaller than the conventional one as described above, the full water level indicator 67a
Is easy to use safely without being difficult to see from the outside, so that it is suitable for enhancing the heat retention. Here, the visible range θ is a region formed by an envelope extending from the portion of the full water level indicator 67a to the outside through the contour of the mouth 3a.

The protruding amount H of the protruding surface 4n is smaller than the difference S between the inner diameter of the mouth 3a and the inner diameter of the body 3b as in the examples shown in FIGS. 1 and 2 and the examples shown in FIGS. Alternatively, the protruding surface 4n may be aligned with the inner diameter surface of the mouth 3a or may be in a state of extending straight from the inner diameter surface of the mouth 3a as in the example shown in FIG. In any case, the larger the protrusion amount H, the wider the visible range θ becomes, and the more the full water level indicator 67a becomes easier to see. However, as shown in FIGS. 2 (a) and 2 (b), it may be partially embossed inward in both the circumferential direction and the vertical direction, or may be the example shown in FIGS. As in the example shown in FIG.

When the protruding surface 4n is annularly continuous, the full water level indicator 67a is provided continuously annularly or formed intermittently at a large number of places by using the annular surface 4n. It is easy to see from the direction. In addition, since the diameter of the safety space 100 from the water filling level 67 to the opening end of the mouth 3a is reduced by the amount corresponding to the protrusion amount H of the protrusion surface 4n, the safety space 100 is unnecessarily large, and the heat escapes. Can be suppressed.

The mouth 3a and the full water level indicator 67a as described above.
In view of the relationship between the position and the visibility, it is preferable that the protrusion amount H of the protrusion surface 4n be increased in proportion to the difference in the inner diameter of the mouth 3a, such as the inner diameter of 120 to 140 mm.

On the other hand, an operation panel 32 is provided on the upper surface of the front part of the body 1 so as to display various settings and display the setting state and operation state. The standard range of the line of sight is approximately α shown in FIG. 2, and is located at a position of about 30 to 40 cm or an extension thereof on the extension thereof. Also, the electric pot with the lid 13 opened rearward is optimally located at the front side where the operation panel 32 is located in order to show the whole inside and outside of the electric pot. Also, it is preferable to place the kettle with a dominant hand and pour it from the side so that it is not disturbed by the lid 13 and does not wet the operation panel 32. The standard position of the eye of the user is a standard position when viewing the operation panel 32 or a position close thereto.

Therefore, the full water level 6 on the inner surface of the vacuum
The position of the full water level indicator 67a provided on the front side of the container 1 is set within the maximum viewing range θ extending from the full water level indicator 67a to the outside through the outline of the mouth 3a of the vacuum double container 3. It is also set to include the position of the eye of the user who views the panel 32. It is convenient to satisfy such conditions as long as the full water level indicator 67a provided on the various projecting surfaces 4n described above. However, the present invention is not limited to the case where the full water level indicators 67a are provided on the various protruding surfaces 4n described above, and may be satisfied with them or under other conditions.

In this way, the probability that the user's eyes are included in the maximum viewing range θ extending from the full water level indicator 67a to the outside through the contour of the mouth 3a is high, and even if the user's eyes come off, it may be adjusted slightly. The water level indicator 67a is easy to see regardless of the difference in the inner diameter of the portion 3a, and is easy to use safely. Therefore, it is suitable for variously reducing the inner diameter of the mouth portion 3a to increase the heat retaining power.

Also, except for the case where the protruding surface extends straight from the inner diameter surface of the mouth, and thus excluding the example shown in FIG. 19, the examples of FIGS. 1 and 2 and the examples of FIGS. In this case, if the squeezing is started from the inner diameter surface of the mouth at the position about 5% of the total capacity of the heat insulating container from the water level, the safety space above the water level becomes large and heat is generated. It is possible to suppress that it is easy to escape upward. In this case, the downward step 200 formed by the lower end of the protruding surface 4n with respect to the inner diameter surface of the body 2b has a larger inclination angle than the aperture-shaped surface 4b at the mouth 3a. As shown in FIG. 16, the diaphragm-shaped surface 4 b is located at a higher position of the vacuum double container 3, and the angle of the minimum visual recognition line 202 is lower than that of the step 200 located at a lower position. If the angle is lower than the line 201 and the angle is slightly larger than the minimum visual recognition line 202, dirt and the like on the diaphragm-shaped surface 4b can be visually recognized from the outside. By making the inclination angle larger than that of the aperture-shaped surface 4b by an amount larger than that, dirt and the like can be visually recognized from the outside.

Further, as shown in FIG.
If the outer diameter of the opening 3a is smaller than the body diameter of the outer cylinder 5 forming the vacuum double container 3, the outer diameter is reduced by utilizing the reduced inner diameter of the opening 3a. The volume around the mouth 3a can be reduced, which contributes to further downsizing of the body 1. In this embodiment, in particular, the mouth 3 of the vacuum double container 3 is used.
The outer diameter of “a” is smaller than the body diameter of the inner cylinder 4. Thereby, the volume around the mouth 3a can be further reduced.

In this embodiment in which the outer diameter of the mouth 3a is reduced, the joint between the mouth 4a of the inner cylinder 4 and the mouth 5a of the outer cylinder 5 forming the vacuum double container 3 is further improved. 64 is
As shown in FIGS. 1 to 4, it is located on the outer diameter side of the opening end of the mouth 3 a of the vacuum double container 3. As a result, the inner tube 4 and the outer tube 5 share the aperture shape of the mouth portion 3a that reduces the inner diameter of the mouth portion 3a together with the outer diameter, and the aperture shape is not concentrated on one of the inner and outer cylinders 4, 5. It is easy to process, is advantageous in terms of material and processing work, and can reduce costs. Both inner and outer cylinders 4 and 5 are JIS SUS304,
It can be manufactured without any problem using SUS436 or the like.

As the outer diameter of the opening 3a is reduced, an annular space 65 is formed around the opening 3a between the outer diameter of the opening 3a and the outer diameter of the body 3b of the vacuum double container 3. Utilizing the shoulder member 6 and the vacuum double container 3 as shown in FIGS.
Is provided. Thus, the shoulder member 6 is attached to the shoulder portion 3d of the metal vacuum double container 3 to attach the shoulder member 6 which is easy to give a required shape around the opening 12 of the container 1 communicating with the mouth 3a. And the vacuum double container 3 are provided by utilizing the annular space 65 formed around the mouth 3a between the outer diameter of the body and the outer diameter of the mouth of the vacuum double container 3. A special space is not required, the body 1 does not become bulky, a space can be provided around the mouth 3a, and a mounting portion 66 which is easily bulky, such as having a necessary mounting strength and a seal portion, is provided.
It is suitable for installing other necessary components.

In the illustrated example, the shoulder 3d of the vacuum double container 3
Are provided at several places in the circumferential direction by welding or the like as shown in FIGS.
A mounting flange 6a on the inner periphery of the shoulder member 6 is applied to 1 and a washer ring 75 made of metal and having an L-shaped cross section is applied thereto. A screw 72 is passed from the washer ring 75 side to the mounting bracket 71. Screwed. This screwing can be achieved with a simple shape for both the mounting bracket 71 and the shoulder member 6 because the shoulder 3d is horizontal.

The screwed portion of the shoulder member 6 is covered and covered by a synthetic resin shoulder ring 73 fitted to the inner peripheral surface 6b integrally forming the mounting flange 6a of the shoulder member 6. The shoulder ring 73 has hook pieces 73c extending downward at several places in the circumferential direction as shown in FIG. 14, and these hook pieces 73c are attached to the washer ring 7 as shown in FIG.
5 and holes 75a, 6 formed in the mounting flange 6a.
d is inserted from above and is prevented from coming off by elastically engaging with the opening edge of the hole 6d at the final insertion position. The shoulder ring 73 is a seal member 7 fitted in the outer peripheral groove 73a.
4 presses against the inner peripheral surface 6b of the shoulder member 6 to seal the gap between them. Also, as shown in FIGS. 3 and 4, the shoulder ring 73 has an inner circumference that is the inner cylinder 4 at the mouth 3 a of the vacuum double container 3.
And, it has a hook-shaped cross section over the joint 64 of the outer cylinder 5 and is sealed by a seal member 77 sandwiching the both. The sealing member 77 is a joint 64 between the inner and outer cylinders 4 and 5.
The inner peripheral sides are fitted into the mouth portions 4a and 5a.

Also, as shown in FIGS. 1 and 2, the annular space 65 is used to open the opening 12 of the vessel 1 communicating with the mouth 3a.
There is provided a connecting portion 15 for hinge-connecting so that the lid 13 for opening and closing can be opened and closed to the body 1. As described above, by providing the connecting portion 15 of the body 1 using the annular space 65, a special space for the connecting portion 15 for hinge-connecting the lid 13 becomes unnecessary, so that the body 1 does not become bulky and the mouth portion does not become large. It is suitable for providing a complicated and bulky connecting portion 15 such as having a stopper 68 which is a movable portion for attaching and detaching the lid 13 or providing other necessary components together with a space around 3a. Conventionally, because of the complicated and bulky connecting portion, the connecting portion which does not protrude from the outer surface of the body 1 as shown by a phantom line in FIG. The portion 15 can be easily formed, and the appearance can be simplified.

In the example shown, the stopper 68 is urged upward by a spring 69 as shown in FIG.
5, the horizontal opening 171a of the concave portion 171 fitted with the hinge pin 16 is always closed. This allows
Even if the lid 13 is set to the open position where it is removed from the opening 3a and the opening 12 of the body 1 and the hinge pin 16 is moved so as to be pulled out from the recess 171, the hinge pin 16 is caught by the stopper 68 and the recess 171 is caught. Can't get out of In order to remove the lid 13, it is necessary to open the opening 171a of the recess 171 by moving the stopper 68 downward against the spring 69 by the operating portion 68a. This prevents the lid 13 from being accidentally detached.

Further, as shown in FIG. 2, the lid 13 has an entrance 13a into the mouth 3a of the vacuum double container 3, and the mouth 3a
Is located at a position closest to the envelope 78 drawn by the entrance portion 13a when the lid 13 is opened and closed. In this way, by making a part of the lid 13 enter the mouth 3a of the vacuum double container 3 as the entrance 13a, the mouth 3a
At the same time as preventing heat from escaping from the air, increasing the heat retention, and at the same time, the steam passage 17 and the bellows pump 5 which is a manual pump.
The bulge to the outside of the body 1 can be suppressed while sufficiently securing a large capacity necessary for the lid 13 by housing 0.
Moreover, since the opening 3a of the vacuum double container 3 whose inner diameter is reduced as described above is located immediately near the envelope 78 that outlines the entrance portion 13a when the lid 13 is opened and closed, it does not hinder the opening and closing of the lid 13. It is possible to reduce the inner diameter to the maximum limit, thereby making it more difficult for heat to escape.

In addition, a seal member 122 is provided around the base of the entrance 13a of the lid 13 between the lid 13 and a metal inner lid 121 applied to the entrance 13a. And the mouth portion 3a is closed by pressing against the innermost diameter portion. Thereby, the air located in the safety space for preventing the content liquid from closing the inner opening 17a of the steam passage 17 between the full water level and the entrance 13a is greatly spread to the outside more than the mouth 3a, and the heat is easily released. As a result, the heat retention is improved.

Further, in the configuration in which the container 1 accommodates the vacuum double container 3 in the outer case 2, the space 79 between the vacuum double container 3 and the outer case 2 and the outer case 2 itself are provided. Since two heat insulating layers are formed, the heat retaining power is further improved. According to an experiment by the present inventors, in a thermos bottle keeping state in which the content liquid was boiled and left standing for 2 hours without energizing the heater 11, the temperature of the content liquid was 95 ° C.
A moderately high warming temperature was obtained. Then, when it was left to stand at a medium warming temperature of about 90 ° C. which can withstand practical use, it took about 2 hours and 40 minutes since the thermos kept warm. This saves about 7,000 yen compared to about 6,500 yen in the past year. Further, the space 79 between the vacuum double container 3 and the outer case 2 is suitable for accommodating the discharge path 25 and the electric pump 26 as the liquid discharging means, the control board 27, the power supply board, and the like.

If at least one of the electric pump 26 and the manual pump such as the bellows pump 50 is provided, the liquid content can be discharged and used while the electric hot water storage container is kept stationary. It is suitable for large types that are difficult. In particular, when a manual pump is provided, the liquid content can be discharged without being energized at the time of use in a warm state in which the heater 11 is not heated,
It is suitable for energy saving and use where there is no power supply.

More specifically, as shown in FIG. 2, the inner cylinder 4 is connected to the small-diameter mouth 3a by a diaphragm-shaped surface 4b rising slightly above the water level line 67 in the body 4m and diagonally inward. From here, the straight inner surface 4c of the mouth 3a is formed, and then the opening end face 3a1 of the mouth 3a, which is slightly obliquely upward, is formed to form a welded joint 6 with the outer cylinder 5.
4 has been reached. The outer cylinder 5 is the inner cylinder 4 at the body 5m.
Of the diaphragm-shaped surface 4b, the diaphragm-shaped surface 5b rising gradually inward from the position substantially corresponding to the rising start point of the diaphragm-shaped surface 4b, and then at the horizontal position substantially corresponding to the rising end point of the diaphragm-shaped surface 4b. Connected to the shoulder 3d,
From this, it rises straight and reaches the welded joint 64 with the inner cylinder 4.

The inner cylinder 4 has a body 4 m as shown in FIG.
A small inward flange 4e is formed at the lower end, and is formed into a container shape by integration with a welded portion 80 with a circular bottom plate 81. A horizontal portion 4 is formed on the bottom of the container-shaped inner cylinder 4 formed in this manner from the outer peripheral side toward the center.
f, a gentle downward slope 4g, a horizontal part 4h, a steep downward slope 4i, and a central horizontal part 4j. On the other hand, the outer cylinder 5 has an inward flange 5c formed at the lower end of the body 5m as shown in FIG. 10, and a horizontal bottom ring 5d extending from the flange 5c to the outer periphery of the central horizontal portion 4j of the inner cylinder 4. Are integrated with a welded joint 90, and the inner periphery of the bottom ring 5 d is integrated with a welded joint 80 with the central horizontal portion 4 j of the inner cylinder 4. The bottom ring 5d is formed by bending two annular reinforcing beads 5g.
As shown in FIG. 3, the inner reinforcing bead 5g engages with the steeply downwardly inclined portion 4i of the inner cylinder 4, thereby forming the bottom ring 5d.
The bottom of the inner and outer cylinders 4 and 5 can be positioned at the time of welding and joining with the central horizontal portion 4j.

As a result, a space extending from the body to the space between the bottom ring 5d of the outer cylinder 5 and the bottom of the inner cylinder 4 is formed. That is, when the vacuum space 63 is formed, it becomes the wraparound portion 63a of the vacuum space 63. The central horizontal portion 4j of the inner cylinder 4 has a single bottom 3c on the inner side from the welded joint 80 with the bottom ring 5d of the outer cylinder 5, and the heater 11 is applied to the inner bottom 4c so that the liquid contained in the inner cylinder 4 can be efficiently used. Although the heating can be performed well, in this embodiment, a portion of the central horizontal portion 4j to which the heater 11 is applied is formed as a downward concave portion 3e which is depressed upward, and the position of the heater 11 is reduced by the depth of the concave portion 3e. It protrudes to the content liquid side, and the contact area with the content liquid in the installation area of the heater 11 increases, thereby improving the heating efficiency.

An upward concave portion 84 is formed annularly between the projecting portion of the concave portion 3e into the inner cylinder 4 and the wraparound portion 63a, and the content liquid discharged through the discharge passage 25 is filled in the concave portion 84. The inflow end 25e of the discharge passage 25 is appropriately protruded so as to be left somewhat. As a result, the content liquid remains without being discharged by an amount corresponding to the inflow end 25e protruding into the inner cylinder 4, thereby preventing the empty firing. In the embodiment shown in FIGS. 1 to 15, the inflow end 25 e of the discharge passage 25 is connected to the widened extension 84 a of the recess 84. As shown in FIG. 5, when the extended portion 84a is formed by eccentrically forming the circular concave portion 3e, the area of the heater 11 does not decrease, so that the heating efficiency does not decrease. The extended portion 84a may be formed by cutting out a part of the circular concave portion 3e as shown by a solid line or a virtual line in FIG. 6, and in this case, the area of the heater 11 is reduced by the cutout. However, the proportion is small.

A metal heat shield plate 87 is provided on the back of the heater 11 abutting on the single bottom 3c, and is welded to the outer surface of the recessed portion 3e and the space around the vacuum space of the vacuum double container 3. 1, 8, and 13 attached to several places in the circumferential direction with screws 89, and a metal backup plate 92 and a spring are provided between the heat shield plate 87 and the heater 11. The member 91 is sandwiched and the spring member 9
The heater 11 presses the heater 11 against the single bottom 3c to make the heater 11 adhere closely. Further, a double structure portion in which the inner and outer cylinders 4 and 5 serving as the welded joints are in contact with each other is located at the fitting portion of the heater 11 and the bottom of the concave portion 84. Note that the same mounting bracket 88 at the bottom and the mounting bracket 71 at the shoulder are employed.

The outer cylinder 5 has an opening 5 extending from the portion of the squeezed surface 5b to the joint 64 with the inner cylinder 4 via the shoulder 3d.
The area a is a separate member 83 independent of the body side, and a welded joint 85 is provided between the body side and the outward flanges 5e, 5f. By performing the welding and joining of the separate member 83 last, the container-shaped inner cylinder 4 and the outer cylinder 5 having no separate member 83 are fitted to each other to perform the welding of the bottom portion.
, A double container structure in which the inner and outer cylinders 4 and 5 having the drawn surfaces 4b and 5b are combined with both the inner and outer cylinders 4 and 5 is realized. In addition, it goes without saying that the throttle-shaped portion of the inner cylinder 4 may also be a separate member.

The vacuum space 63 between the inner and outer cylinders 4 and 5 is formed in the inner and outer cylinders 4 and 5 which have been welded and joined, as shown in FIG. Hole 1
It is formed by evacuating through 01 and sealing with a sealing material. The evacuation is performed in a heating furnace in a vacuum state. In the vacuum space 63, one or more getters 102 as shown in FIG.
The gas generated over time in the chamber 3 is absorbed so that the degree of vacuum in the vacuum space 63 is not reduced.

The lid 13 is formed with a vapor passage 17 for allowing the vapor from the vacuum double container 3 to escape to the outside. The lid 13 has an inner opening 17a at a position facing the inside of the vacuum double container 3 and an outer surface exposed to the outside. It communicates with the formed outer opening 17b. In the middle of the steam passage 17, a safety path 17c is provided for temporarily storing or bypassing the content liquid when the container body 1 rolls over and enters, thereby delaying the liquid from reaching the outer opening 17b. This makes it possible to take measures such as raising the container 1 before the container 1 rolls over and the content liquid flows out through the vapor passage 17 to the outside. Further, in the steam passage 17, when the body 1 rolls over, a water stop valve 18 at the time of overturning, which works by its own weight or the like so as to try to enter the steam passage 17 or to prevent the entered liquid from proceeding ahead, is provided in place. Is provided. In the illustrated embodiment, it is provided at one location just inside the inner opening 17a.

At the front of the lid 13, there is provided a lock member 21 which engages with the locking portion 19 on the shoulder member 6 side at the closed position to lock the lid 13 at the closed position, and when the lid 13 is closed. The spring 22 always projects to the locked position by the bias of the spring 22 so as to automatically engage with the locking portion 19. Correspondingly, the lid 13 is provided with a lock release member 23 for retreating the lock member 21 to release the lock. As shown in FIG. 1, the lock releasing member 23 is of a lever type pivotally supported on the lid 13 by a shaft 24, and the front end 23a is depressed with a thumb or the like and rotated counterclockwise to turn the lock member 21 into a spring. The unlocked lid 13 can be lifted and opened by pulling up the rear end 23b raised by the unlocking operation with another finger to retract the unlocked lid 13 by retracting it against the lock 22.

The electric pump 26 is a centrifugal pump and is provided immediately below the vacuum double container 3.
The content liquid flowing from the inside is sent to the discharge port 25d facing the outside of the body 1 through the discharge path 25, and is discharged from the discharge port 25d to the outside for use.

In the space between the bottom 2 a of the outer case 2 and the bottom of the vacuum double container 3, together with the electric pump 26,
Control board 2 for controlling the power supply to heater 11 and electric pump 26
7 is installed. In the illustrated embodiment, the circuit box 28 is provided integrally with an opening at the bottom of the outer case 2. The circuit box 28 is provided with a lid 160 which opens downward and closes it. A temperature sensor 29 is applied to the center of the single bottom 3c of the vacuum double container 3 from below, detects the temperature of the content liquid at each time, and controls the temperature when heating and controlling the content liquid in a water heating or heat retention mode. get information.

An operation panel 32 is provided on the upper surface of a beak-like projection 31 protruding from the front of the shoulder member 6 of the body 1 to operate modes such as mode setting, display corresponding to the operation, or operating state. Is displayed. An operation board 33 for transmitting and receiving signals corresponding to the operations and displays is provided below, that is, inside, the operation panel 32, and can be operated from outside or displayed to the outside in cooperation with the operation panel 32. To do. The upper part of the discharge path 25 is the container 1
An inverted U-shaped unit 25c is formed by a portion inserted between the projecting portion 31 of the outer case 2 and the pipe cover portion 2d of the outer case 2, and the unit 25c includes a water stop valve 134a when falling and a water stop valve when leaning forward. 134b and a discharge port 25d are provided. The discharge port 25d opens downward to the outside through the pipe cover 2d.

A cover plate 36 is applied to the opening 2c on the bottom 2a of the outer case 2 from below by screwing or partially engaging the cover plate 36, and a rotary seat ring 37 rotates around the outer periphery of the cover plate 36. It is provided so as to be supported as possible, so that when the body 1 is fixed on a table surface or the like, it can be rotated slightly on the rotary seat ring 37 to change its direction.

When the power is turned on, the control board 27 is temporarily boiled from the viewpoint of hygiene of the content liquid and removal of the smell of lime, or the like. Heating of the heater 11 is stopped until a predetermined heat retention temperature is reached, and when the predetermined heat retention temperature is reached, the predetermined heat retention temperature is maintained by intermittent heating by the heater 11 or heating with a small current-carrying capacity.

The heat retaining temperature can be selected by operating the operation panel 32, and it can be used immediately for coffee, tea, green tea, etc.
Alternatively, a high-temperature insulation of about 98 ° C. which can be used after being instantaneously re-boiled, an insulation of about 90 ° C. slightly lower than that, and an insulation of about 60 ° C. suitable for melting gyokuro and baby milk can be selected. In addition, there is also a thermos holding mode in which the content liquid is boiled to keep the temperature without heating by the heater 11. On the other hand, a rest timer mode in which the content liquid is poured out by the electric pump 26, and the timer is set such that the water content ends at a predetermined time, such as when the content liquid returns home or when the user wakes up, or is kept in a predetermined heat retaining state. In addition, a kitchen timer for counting and informing cooking time such as instant noodles and the regenerating time of frozen food, and a lock mode for dispensing to prevent inadvertent dispensing of a liquid content are selectively set. Further, a release operation for releasing these setting states is also performed.

The discharge passage 25 is provided in the narrow projection 31.
Even if it is installed together with the unit 25c, the annular space 65 around the mouth 3a of the vacuum double container 3 can be largely released to the vacuum double container 3 side. It is easy to prevent it from interfering with a certain operation board 33 or a board box 34 containing it,
The thickness and size of the protruding portion 31 can be reduced. In addition, since the diameter of the opening 12 of the body 1 also becomes smaller as the outer diameter of the opening 3a of the operation panel 32 becomes smaller, the distance from the tip of the protrusion 31 having the same degree of protrusion to the opening 12 as the conventional one becomes larger. Become
The operation panel 32 has a large area, and is easy to see and operate for providing various operation keys and a display unit. Another advantage is that a large liquid crystal display 38a is provided.

In the example shown in FIG. 16, the concave portion 3e to which the heater 11 is applied is formed concentrically with the body portion 2b, and the concave portion 84 is concentric and does not have a partially expanded portion. As a result, the inflow end 25e of the discharge path 25 is connected to the ceiling wall of the recess 3e so as to prevent empty burning.

[0069]

According to the present invention, the inner diameter of the mouth exerts a higher heat-retaining power than the inner diameter of the body in the heat insulating container, and the heater heats the content liquid at the non-insulated bottom, so that the heat can be heated efficiently. In addition, since the water level indicator corresponding to the full water level is provided on the protruding surface that protrudes inward from the inner diameter surface of the body, the protruding surface protrudes from the inner surface of the body recessed with respect to the opening of the mouth. Because it is close to the inner diameter surface of the mouth by the amount, it is hard to hide in the aperture-shaped mouth for visual recognition from the outside, and the visible range from the outside through the mouth is widened. Accordingly, even when the inner diameter of the mouth portion is smaller than that in the related art, the full water level indicator is not easily seen from the outside and is easily used safely, so that it is suitable for increasing the heat retaining power.

The amount of protrusion of the protruding surface can be made smaller than the difference between the inner diameter of the mouth and the inner diameter of the trunk, or the protruding surface can be aligned with the inner diameter surface of the mouth or extend straight therefrom. The larger the protruding amount, the wider the visible range becomes, and the more easily it is seen. Further, the protruding surface may be provided partially around the inner surface of the heat insulating container or may be provided in an annular shape. It is possible to prevent the safety space from becoming excessively large and heat from escaping easily, and the area where the liquid content comes into contact with the air becomes small and the heat hardly escapes to the upper part, which also increases the heat retention.

In view of the relationship between the position of the mouth and the full water level indicator and its visibility as described above, it is preferable that the amount of protrusion of the projecting surface be increased in proportion to the inner diameter of the mouth.

The electric hot water storage container having the heat insulating container of the present invention also has a heat insulating container in the body, a heater is applied to the non-insulated bottom of the heat insulating container from the outside, and the inner diameter of the heat insulating container has a trunk inner diameter. In the one having a narrowed mouth portion smaller than the inner diameter, the position of the full water level indicator provided at the full water level of the inner surface of the heat insulating container is the maximum visual range extending from the full water level indicator to the outside through the mouth contour of the heat insulating container. Another feature is that the setting is made so as to include the position of the eyes of the user who looks at the operation panel provided on the front upper surface of the body.

In such a configuration, the inner diameter of the mouth exerts a higher heat-retaining power on the heat insulating container than the inner diameter of the body, and
The heater heats the content liquid at the non-insulated bottom, so that it can be heated efficiently.In addition, the electric hot water storage container with the lid opened rearward has a front side of the operation panel to show the whole inside and outside view. It is best for the operator to be located, and to replenish the contents, it is located at the front of the electric water storage container, so that it is not disturbed by the lid to pour the kettle with a dominant hand from the side and the operation panel The standard position of the user's eyes during such work is the standard position when looking at the operation panel or a position close to the standard position. It is likely to be included in the maximum visibility range that extends to the area, and even if it deviates, it may be adjusted slightly, regardless of the difference in the inside diameter of the mouth, it is easy to see the full water level index and it is easy to use safely, so make the inside diameter of the mouth small To increase heat retention It is suitable for.

Except for the case where the above-mentioned protruding surface extends straight from the inner diameter surface of the mouth, the starting point of drawing from the inner diameter surface of the body at the mouth is located at about 5% of the total capacity of the heat insulating container from the water level. When it is located, it is possible to suppress that the safety space above the water level is unnecessarily large and heat is easily escaping upward.

In each of the above-mentioned inventions, when the heat insulating container is a vacuum double container made of metal, since the bending rigidity and strength are high, the wall thickness and the vacuum space layer are small and slim, and exhibit a high heat retaining power while being slim. When the material is stainless steel, the thermal conductivity is low, and the heat retention is further improved.

In this case, in particular, when the inner diameter of the mouth is 120 to 1
When it is 40 mm, the inner diameter of the conventional electric pot is 145 mm as described above, but without the danger that the full water level index becomes difficult to see as in each of the above inventions.
Even if the inner diameter is 140 mm or less, the heating of the heater is stopped after boiling even if the inner diameter is 140 mm, and the temperature of the content liquid after 2 hours has passed is about 92 ° C., which is the medium temperature keeping temperature, and the heat retaining power is improved as compared with the related art. To the lower limit of about 120 mm, the medium temperature insulation temperature of 92 ° C and the high temperature insulation temperature of 98 ° C
The temperature is about 95 ° C., which is an intermediate quasi-cooling / remaining temperature, which further improves the heat retaining power and can further save energy. Moreover, the inner diameter of 140 mm is only 3.45% smaller than the conventional inner diameter of 145 mm, and the lower limit of 120 mm
In this case, the reduction is only 18.24%. Therefore, even if it is formed of the same material as in the conventional case, the workability of the drawn shape is not particularly reduced, and the reliability and the cost are not particularly different from those of the conventional case.

Also, since the limit of the inside diameter of an adult person's hand, especially a fist, is about 80 mm, which is sufficiently larger than that and easily accessible, the cleaning and wiping can be easily performed as before. It can be used, and it is easy to take in and out processing tools and processing equipment such as guns and sprays that perform blasting and fluorine coating on the surface, and there is no inconvenience in surface processing and processing operations. Furthermore, in consideration of keeping the temperature without heating by the heater and incorporating a manual pump such as a bellows pump in the lid of the body to pressurize and extrude the liquid content without power supply, the discharge flow rate suitable for practical use is considered. Although a pump having a sufficient capacity is required, it is possible to prevent the lid with a built-in pump from being inserted into the mouth even with the minimum inner diameter of 120 mm, thereby preventing the lid from protruding outside the body and increasing its size.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of an electric pot having a vacuum double container according to the present invention.

2 (a) is a sectional view and FIG. 2 (b) is a front view of a full water level indicator showing the vicinity of the mouth of a vacuum double container of the electric pot of FIG.

FIG. 3 is a cross-sectional view showing a shoulder member attaching portion around a mouth of the vacuum double container of the electric pot of FIG. 1;

4 is a cross-sectional view of the electric pot of FIG. 1 at another position showing a shoulder member attaching portion around the mouth of the vacuum double container.

FIG. 5 is a view showing a state of a discharge path connection state in the electric pot of FIG. 1;
It is a cross-sectional view which shows two examples.

FIG. 6 is a cross-sectional view showing another example of a discharge path connection state in the electric pot of FIG.

FIG. 7 is a plan view showing a half part of a vacuum double container in the electric pot of FIG. 1;

FIG. 8 is a bottom view showing a half part of the vacuum double container in the electric pot of FIG. 1;

FIG. 9 is a partial cross-sectional view showing the bottom of the inner cylinder constituting the vacuum double container in the electric pot of FIG. 1;

FIG. 10 is a partial cross-sectional view showing a bottom of an outer cylinder constituting a vacuum double container in the electric pot of FIG. 1;

FIG. 11 is a partial cross-sectional view showing a mouth of a vacuum double container in the electric pot of FIG. 1;

12 is a cross-sectional view of a part of the electric pot of FIG. 1 at another position showing a mouth portion of the vacuum double container.

FIG. 13 is a sectional view showing the entire bottom of the vacuum double container in the electric pot of FIG. 1;

FIG. 14 is a cross-sectional view of a shoulder ring covering a screwed portion of a shoulder member in the electric pot of FIG. 1;

FIG. 15 is an external perspective view of the electric pot of FIG. 1;

FIG. 16 is a sectional view showing another example of the vacuum double container in the electric pot of FIG. 1;

FIG. 17 is a graph showing the relationship between the opening diameter of the mouth of the vacuum double container and the quality as viewed from various aspects.

FIG. 18 is a partial cross-sectional view showing a vacuum double container of an electric pot having a water level indicator of another example different from the above.

FIG. 19 is a partial cross-sectional view showing a vacuum double container of an electric pot having a full water level indicator different from the above.

FIG. 20 is a sectional view of an electric pot having a conventional vacuum double container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument body 2 Outer case 2b Body 3 Vacuum double container 3a Mouth 3b Body 3c Single bottom 4 Inner cylinder 4b Restricted surface 4n Projection surface 5 Outer cylinder 11 Heater 12 Opening 13 Lid 32 Operation panel 63 Vacuum space 67 Full water Position 67a Full water level index θ Viewing range (for the full water level index) α Viewing range (for the operation panel)

Claims (9)

[Claims] 1. A heat insulating container having a heat insulating container in a body, a heater being applied to a non-insulating bottom of the heat insulating container from the outside, and a narrowed opening having an inner diameter smaller than the inner diameter of the body in the heat insulating container. An electric hot water storage container having an insulated container, wherein a full water level indicator is displayed on a protruding surface that protrudes inward from an inner diameter surface of a body at a full water level. 2. The electric hot water storage container having the heat insulating container according to claim 1, wherein the amount of protrusion of the protruding surface is smaller than the difference between the inner diameter of the mouth and the inner diameter of the trunk. 3. The electric hot water storage container having the heat insulating container according to claim 1, wherein the projecting surface extends straight from the inner diameter surface of the mouth. 4. The electric hot water storage container having the heat insulating container according to claim 1, wherein the projecting surface is annular. 5. The electric hot water storage container having the heat insulating container according to claim 1, wherein the amount of protrusion of the protruding surface is increased in proportion to the inner diameter of the mouth. 6. A heat insulating container having a heat insulating container in a vessel, a heater being applied to the non-insulating bottom of the heat insulating container from the outside, and a throttle-shaped opening having a smaller inner diameter than the inner diameter of the body formed in the heat insulating container. In the electric hot water storage container having the container, the position of the full water level indicator provided at the full water level on the inner surface of the insulated container is set in a visible range extending from the full water level indicator to the outside through the mouth contour of the insulated container. An electric hot water storage container having a heat insulating container, wherein the electric water storage container is set to include a position of an eye of a user who looks at an operation panel provided on an upper surface of the unit. 7. The method according to claim 1, wherein the mouth portion starts to be squeezed with respect to the inner diameter surface of the body at a position about 5% above the full capacity of the heat insulating container from the full water level. An electric hot water container having the insulated container as described. 8. The electric hot water storage container having the heat insulating container according to claim 1, wherein the heat insulating container is a vacuum double container made of metal. 9. The electric hot water storage container having the heat insulating container according to claim 8, wherein the inner diameter of the mouth is 120 to 140 mm.