JP2001120430A - Electric hot water container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and light-weight electric hot-water container by simplifying an electric heater for heating water. SOLUTION: An electric heater 12 made of a printing heater is mounted on the lower side of the bottom board 8 of an inner container 4 of this electric hot-water container. An attaching member exclusive for the electric heater is not necessary. In addition, the heating efficiency is improved, and as a result, the quantity of heat radiated downward from the electric heater 12 is reduced, so that the distance to an electric part box 22, etc., located downward can be shortened and a thermal insulating board, etc., will not be required. As a result, the whole, the whole container can be compact and light, allowing a user to carry the container easily, improving the usability.

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 a water heating function and a heat retaining function.

[0002]

2. Description of the Related Art FIG. 13A shows an example of the above-described electric hot water storage container, that is, an electric pot. The electric pot includes a container body 82 having an inner container 81 for storing hot water therein, and a lid 83 detachably attached to an upper portion of the container body 82. The inner container 81 shown in the figure is provided with an outer cylinder 85 surrounding the side wall surface of the inner cylinder 84 having a bottomed cylindrical shape and the outer peripheral side of the bottom wall surface. It is formed in a vacuum double structure as a vacuum insulation space.

A bottom plate portion 84a of the inner cylinder 84 has an inner peripheral portion on the outer side with respect to a joint portion with the outer cylinder 85.
It is formed so as to be recessed upward in a step shape. A bottom sensor 86 made of a thermistor or the like is arranged on the lower surface of the central portion so as to abut from below, and the temperature of the hot water stored in the inner container 81 is detected by the bottom sensor 86. The heater unit 8 has a shape surrounding the bottom sensor 86.
Reference numeral 7 is provided in the step-shaped recess.

As shown in FIG. 1B, the heater unit 87 is formed by sequentially laminating a thin cover plate 88, an electric heater 89, a heat transfer plate 90, and a holding plate 91 from the upper layer side. I have. The electric heater 89 is formed by a mica heater having a structure in which a resistance heating type heater wire is sandwiched between mica plates (mica plates).

[0005] Below the heater unit 87, an inner cylinder 84 is provided.
A bottom heat shield plate 92 that covers the step-like concave portion from below in the bottom plate portion 84a is disposed. This bottom heat shield plate 92
The peripheral side is fixed to the lower surface of the outer cylinder 85, and a short cylindrical portion bent upward is provided at the inner end of the bottom heat shield plate 92. A spring member 92a extending radially outward is attached to the outer periphery of the cylindrical portion.
2a is brought into contact with the lower surface of the holding plate 91 to assemble it, so that an upward pressing force is exerted on the heater unit 87 by the spring member 92a, whereby the cover plate 88 is moved to the lower surface of the bottom plate portion 84a of the inner cylinder 84. The heater unit 87 is incorporated so as to be in close contact with the heater.

The lower side of the bottom heat shield 92 is shown in FIG.
As shown in FIG. 5, a pump device 93 is provided on the front side, and hot water in the inner container 81 is poured through a pouring pipe 94 connected to the pump device 93. The pouring pipe 94
A liquid pipe 94 extending upward on the front side of the container body 82.
a is provided, and a water scale is formed in the liquid amount pipe 94a so that the water scale can be visually recognized from the front side of the container body 82. On the other hand, an electrical component box 95 is installed on the back side in the lower space of the bottom heat shield plate 91.
Inside, a control circuit board 96 on which a microcomputer for controlling the operation of the electric pot is mounted is housed.

[0007] On the upper surface of the electrical component box 95, FIG.
As shown in (1), a substrate heat shield plate 97 for blocking heat radiation downward from the heater unit 87 is further provided. A spring member 98 is provided on the bottom heat shield plate 91 at the center thereof so as to press the bottom sensor 86 upward such that the upper end surface of the bottom sensor 86 is in close contact with the bottom plate portion 84a of the inner cylinder 84.
Is installed. Further, a heat shield ring 99 for blocking heat radiation from the heater unit 87 to the bottom sensor 86 is provided on the outside thereof.

[0008]

By the way, in the above-mentioned electric pot in which the electric heater 89 for heating and keeping hot water is a mica heater, the electric heater 89 is attached when the electric heater 89 is attached to the cover plate 88 or the heat transfer plate 90. Presser plate 91
The heater unit 87
Of the inner cylinder 8 with a spring member 92a attached to the bottom heat shield plate 92.
4, the heater unit 87 is thicker and heavier, and the overall size and weight are sufficiently reduced. There is a problem that cannot be achieved.

In particular, a cover plate 88 is interposed between the heater wire of the electric heater 89 and the bottom plate portion 84a of the inner cylinder 84, in addition to the mica plate as an insulating layer. Since a large void layer is also interposed, the heat flow resistance during this period is relatively large. Therefore, in order to apply a sufficient amount of heat to the bottom plate portion 84a of the inner cylinder 84 during the heat insulation, it is necessary to increase the temperature of the heater wire when the heater wire is energized and heated. .

As a result, the amount of heat radiated downward from the electric heater 89 is also increased, so that the space distance between the electric component box 95 disposed below the electric heater 89 and the substrate heat shield plate 97 is increased. By providing, it is necessary to prevent the electric components in the electric component box 95 from being adversely affected by heat. Therefore, even with this, the overall size and weight cannot be reduced. For this reason, for example, carrying the electric pot requires a relatively large amount of labor, and it is difficult to obtain a user-satisfactory usability. It has become something.

On the other hand, in the electric pot as described above, the hot and cold water in the inner container 81 is maintained at a predetermined heat retaining temperature by energizing the electric heater 89 at the bottom thereof. It hardly reaches the hot water in the hot water pipe 94. Therefore, for example, if pouring is performed after keeping the temperature for a long time, the hot water whose temperature has fallen in the pouring pipe 94 will be poured first, and the desired hot water cannot be obtained at the first cup, and However, this also has a problem that the user cannot obtain sufficient usability.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an electric hot water storage container having improved usability.

[0013]

SUMMARY OF THE INVENTION Therefore, claim 1 of the present invention is provided.
The electric hot water storage container has an inner container for storing hot water inside the container body,
An electric water storage container having an electric heater that is energized to heat and keep the water in the inner container, wherein the electric heater prints a heater element layer that generates heat by energization on a surface of the heater base material in a predetermined pattern. And a printing heater formed by firing.

According to such a configuration, the electric heater comprises:
Since the heater base is formed integrally with the print heater printed on the surface of the heater base, if the heater base is arranged at a predetermined position, a separate mounting member dedicated to the electric heater is not required. Therefore, the number of members required for mounting the electric heater is reduced as compared with the related art, whereby the size and the weight can be reduced, so that the portable heater can be easily carried and the usability is improved.

It is desirable that the above-mentioned electric heater is provided with an insulating protective layer covering the surface of the heater element layer. As a result, for example, characteristic deterioration due to moisture absorption or the like of the heater element layer is suppressed, and it is possible to maintain stable electric heating characteristics and electrical insulation performance.

According to a third aspect of the present invention, in the electric hot water storage container of the first or second aspect, the heater base is made of a stainless steel plate, and a heater element layer is formed on the surface of the heater base via an insulating layer. It is characterized by having.

Since a stainless steel plate has good heat resistance and corrosion resistance and has good thermal conductivity as compared with, for example, a ceramic substrate or the like, the stainless steel plate is used as a heater base material, and a printing heater is provided thereon via an insulating layer. Thus, the entire heater substrate functions as a hot plate. This makes it possible to uniformly heat the hot and cold water in the inner container over a wider area, thereby improving the heating efficiency.

According to a fourth aspect of the present invention, in the electric hot water storage container of the third aspect, the flat area in the bottom plate of the inner container is used as the heater base, and the electric heater is formed in the flat area. Features.

According to this configuration, since the electric heater is formed directly on the bottom plate of the inner container made of stainless steel plate, the mounting member of the electric heater is not required at all, and the size and weight can be further reduced. Can be. In addition, no gap layer is interposed between the electric heater and the bottom plate of the inner container, so that a sufficient amount of heat can be supplied from the electric heater to the bottom plate without increasing the heat generation temperature when energizing the electric heater. Can be granted. As a result, the amount of heat radiated downward from the electric heater is reduced, so that, for example, even when the electric component box is disposed below the electric heater, the distance to the electric component box is made as small as possible, It can be unnecessary. As a result, the overall shape can be further reduced in size and weight, so that usability is improved.

According to a fifth aspect of the present invention, in the electric hot water storage container of the fourth aspect, the bottom plate of the inner container is formed in such a shape that the flat region is located at the lowest position in the bottom plate. It is characterized by.

According to this structure, after forming the inner container into a bottomed cylindrical shape, for example, when printing the heater element layer of the electric heater by screen printing, the screen is brought into close contact with the flat region of the bottom plate portion, This heater element layer can be formed. In other words, when the bottom plate portion has a shape in which a downward protruding portion exists outside the flat region, for example, the screen cannot be brought into close contact with the flat portion, and in this case, the inside of the protruding portion is separated. It is necessary to form the inner container into a bottomed cylindrical shape by welding or the like after forming and forming the printing heater. On the other hand, in the above, since the printing heater can be formed after the inner container is first formed in the shape of a bottomed cylinder, the degree of freedom in manufacturing is improved, and thus the overall manufacturing cost is reduced. It can be.

In particular, when the body side of the inner container has a vacuum double structure, in this evacuation step, a sealing material made of glass or the like attached to the exhaust port is heated and melted.
It is also possible to simultaneously fire the heater element layer after printing, thereby further reducing the overall manufacturing cost.

According to a sixth aspect of the present invention, there is provided the electric hot water storage container according to the fourth or fifth aspect, wherein a heat insulating material is provided below the bottom plate.

According to this structure, heat radiation from the electric heater downward is suppressed by the heat insulating material, so that the heating efficiency is further improved. In addition, the sound that leaks downward from the bottom plate when boiling water in the inner container is also suppressed by the heat insulating material,
Generation of noise can be suppressed.

The electric hot water storage container according to a seventh aspect of the present invention is the electric hot water storage container according to the third aspect, wherein an electric heater is formed in the outer peripheral region on the bottom side of the inner container body as the heater base material. It is characterized by:

According to this configuration, the electric heater composed of the above-described printing heater is integrally formed on the outer periphery of the inner container at the bottom side of the body, and in this case, a mounting member for the electric heater is not separately required. Therefore, the overall shape can be reduced in size and weight, and the water heater and the heat retaining with improved heat transfer efficiency can be performed as described above. Furthermore, even when a temperature sensor or an electrical component box for detecting the temperature of hot and cold water is arranged below the inner container, the electric heater is located at a position farther away from these components. This makes it possible to provide a configuration that is close to that of the first embodiment.

An electric hot water storage container according to an eighth aspect of the present invention is the electric hot water storage container according to the seventh aspect, further comprising a residual water storage portion that is recessed downward on the outer peripheral side of the bottom of the inner container, and surrounds the residual water storage portion from the outside. The electric heater is formed on the outer periphery of the lower end of the portion.

According to this configuration, even when the electric heater is energized in a state where the hot water in the inner container is used up, the electric heater excessively heats up due to the hot water remaining in the residual water storage portion inside the electric heater. Therefore, disconnection or the like due to overheating is prevented, and reliability is improved. Moreover, even in the case where such a residual water storage section is provided, since the heating efficiency of the electric heater composed of the printing heater is good, it is possible to minimize the vertical dimension of the formation area of the electric heater. According to this, the spatial volume of the residual water storage section can be reduced. As a result, the amount of hot water remaining in this part also decreases, and
Since the amount of hot water that can be taken out of the inner container increases, the usability also improves.

According to a ninth aspect of the present invention, there is provided the electric hot water storage container according to the eighth aspect, wherein the electric heater is provided in a region below a height position substantially equal to the level of hot water remaining in the inner container. It is characterized by:

In other words, in this configuration, the electric heater is provided with its upper end positioned at a height substantially equal to the level of the hot water remaining in the inner container, so that the remaining electric hot water extends over the entire electric heater. The cooling action will be ensured. As a result, overheating of the electric heater is more reliably prevented.

According to a tenth aspect of the present invention, in the electric hot water storage container according to any one of the fourth to ninth aspects, the inner container is formed into a bottomed cylindrical shape by welding a material for forming the inner container. The electric heater is provided on the surface of a region other than the welded portion of the vessel.

That is, when a plurality of forming materials are welded to each other to form an inner container into a bottomed cylindrical shape, irregularities are apt to occur in a welded portion. Therefore, when the heater element layer is formed by printing so as to cross this portion, disconnection or the like of the heater element layer is likely to occur. Therefore, by providing the electric heater in a region other than the welded portion, an electric heater having desired characteristics can be formed more reliably without causing disconnection or the like.

In the above electric heater, the bottom plate and the body of the inner container are directly formed as a heater substrate, and the heater substrate is separate from the inner container. It is also possible to provide a structure in which an electric heater is formed and attached to the outer surface of the inner container.

Even in this case, if the heater base material is mounted along the outer surface of the inner container, a special mounting member for the electric heater is not required separately, so that the overall shape can be made compact and lightweight, and can be carried around. Becomes easier and the usability is improved.

On the other hand, an electric hot water storage container according to a twelfth aspect of the present invention includes an inner container for storing hot water and an electric heater which is energized to heat and keep the water in the inner container in the container body. An electric hot water storage container provided with a pouring passage extending upwardly to the side of the inner container, provided with a pouring pipe heating heater for heating and keeping hot water in the pouring passage. It is characterized by having.

According to this configuration, even after, for example, keeping the temperature for a long time, the hot water in the pouring passage is also heated and maintained by the heater for pouring the piping during this time. Yes, thereby improving usability.

The electric hot water storage container according to claim 13 is the twelfth embodiment.
The electric hot water storage container, provided with an operation control device for controlling energization of the electric heater, and a stabilized power supply circuit for converting a commercial AC power supply to a predetermined DC power supply and supplying the DC power supply to the operation control device, This pouring pipe heating heater is placed in front of the stabilized power supply circuit so that the pipe heating heater becomes a voltage dividing resistor for reducing the voltage of the commercial AC power supply to a predetermined voltage and inputting it to the stabilized power supply circuit. It is characterized by being connected.

According to this configuration, the heater for pouring the piping also serves as a voltage dividing resistor in the front stage of the stabilizing power supply circuit, so that the total number of components is reduced. The power consumption by the voltage dividing resistor provided in the power supply is suppressed, and the energy efficiency is improved.

According to a fourteenth aspect of the present invention, there is provided an electric hot water storage container according to the twelfth aspect.
Alternatively, in the electric hot water storage container according to 13, a liquid pipe is provided in the pouring passage from the outside of the container body, and a heater element layer that generates heat by energization is printed and fired on the outer surface of the liquid pipe. And the heater element layer is formed in a pattern that allows the level of hot and cold water in the liquid flow tube to be visually recognized.

According to this configuration, the pouring pipe heating heater also functions as a water level scale in the liquid amount pipe, and therefore, it is not necessary to separately provide a dedicated water level scale. Manufacturing costs can be reduced.

[0041]

[Embodiment 1] Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1A shows an electric pot as an electric hot water storage container according to the present embodiment. This electric pot is a container body 1 in which a hot water storage space 1a recessed from above is formed.
And a lid 2 for covering the space 1a from above.

The container body 1 includes a bottomed cylindrical outer case 3,
An inner container 4 surrounding the hot water storage space 1a, and a shoulder case 5 connecting the upper ends of the outer case 3 and the inner container 4 to each other are provided. The outer case 3 and the shoulder case 5 are each made of synthetic resin. Have been made. The shoulder case 5 is formed so that the outer peripheral side thereof has a cross-sectional shape continuing to the upper end of the outer case 3 so as to constitute the upper exterior body of the container body 1. An upper part on the front side (left side in the figure) is formed as a pouring part 5a bulging forward, and a pouring port tube 23e described later is attached to a lower end side in the pouring part 5a.

The inner container 4 is provided with a metal inner cylinder 6, an outer cylinder 7, and a bottom plate 8 each formed of a stainless steel plate. The inner cylinder 6 has a cylindrical body 6a,
It is formed in a shape having a bottom bent portion 6b bent radially inward from the lower end of the body portion 6a. A substantially disk-shaped bottom plate 8 is welded to the inside of the bottom bent portion 6b so that its upper surface is substantially flush with the upper surface of the bottom bent portion 6b. The space surrounded by the inner cylinder 6 and the bottom plate 8 that closes the bottom opening of the inner cylinder 6 is the above-described hot water storage space 1a.

At the upper end side of the body 6a, there is provided a throttle 6c which is recessed radially inward in a trapezoidal cross section.
A full scale 6d is formed on the inner surface on the rear side (right side in the figure) slightly below the throttle section 6c. By providing the narrowed portion 6c as described above and making the opening area at this portion smaller than the hot water storage space 1a therebelow, upward heat radiation is suppressed, and the heat retention is improved.

The outer cylinder 7 has a cylindrical body 7a surrounding the body 6a of the inner cylinder 6 from the outside, and a position lower than the bottom bent portion 6b of the inner cylinder 6, and a lower end of the body 7a. It is formed in a shape having a bottom bent portion 7b bent inward in the radial direction.
The inner end side of the bottom bent portion 7b is bent stepwise so as to be in close contact with the inner end of the bottom bent portion 6a of the inner cylinder 6 from below, and the respective inner end regions are hermetically joined by welding. ing.

On the other hand, the upper end of the body 7a of the outer cylinder 7 is also
It is airtightly joined to the upper end of the body 6a of the inner cylinder 6 in the same manner as described above. Thereby, each trunk portion 6a, 7a of the inner cylinder 6 and the outer cylinder 7
A closed space 9 is formed between the bent portions 6b and 7b, and the closed space 9 is evacuated and assembled to form a vacuum heat insulating space. As described above, the electric pot of the present embodiment has an excellent heat retaining performance, particularly since the inner container 4 is formed in a vacuum double structure.

The bottom plate 8 has a sensor mounting portion 8a projecting upward in a step shape at the center thereof.
From the periphery of each of the bottom bent portions 6b and 7b of the inner cylinder 6 and the outer cylinder 7
Is formed as a flat plane portion 8b up to the joint portion. A bottom sensor (temperature sensor) 11 composed of a thermistor or the like is provided below the sensor mounting portion 8a so as to contact the lower surface of the sensor mounting portion 8a from below.
By this bottom sensor 11, the temperature of the bottom plate 8, that is,
The temperature of hot water stored in hot water storage space 1a is detected.

On the other hand, as shown in FIG. 3B, the electric heater 12 extends along the lower surface of the flat portion 8b of the bottom plate 8.
Is provided. As shown in an enlarged cross-sectional view in FIG. 2, the electric heater 12 includes, for example, Ag between an insulating layer 13 made of crystallized glass and a protective insulating layer 14.
The heater element layer 15 made of a / Pd alloy is provided in a predetermined pattern. More specifically, first, a glass paste is printed on the surface of the stainless steel bottom plate 8 having a thickness of about 1 mm, and the glass paste is dried and then dried at 850 ° C.
By sintering to the extent, the insulating layer 13 is formed. Thereafter, similarly, the heater element layer 15 and the protective insulating layer 14 are printed, dried, and fired. The electric heater 12 is formed by the printing heater integrally formed on the lower surface of the bottom plate 8 as described above.
Are formed. The thickness of each layer is about 70 to 100 μm for the insulating layer 13 and about 10 to 20 μm for the protective insulating layer 14 and the heater element layer 15, respectively, and the total thickness is 0.15 mm or less. Is formed.

FIG. 3 shows an example of the pattern shape of the heater element layer 15. In the figure, reference numeral 16a denotes a common electrode portion, and a first electrode portion 16b and a second electrode portion 16c are provided near the common electrode portion 16a. Each of these electrode portions 16a to 16c is made of Ag,
When the heater element layer 15 is formed, printing and drying are performed in the same manner.
It is formed by firing. The heater element layer 15
The sensor mounting portion 8a at the center of the bottom plate 8 is formed so as to double surround the sensor mounting portion 8a in a band shape, and both ends are provided with the common electrode portion 16a and the first electrode portion 16a.
b and the inner layer connected to the common electrode part 16a and the second electrode part 16c at both ends are, for example, about 100V-840W. Water heater 15b
It is formed as.

The insulating layer 13 and the protective insulating layer 14 are formed by thin wires shown outside the water heater 15b.
It is formed in a region between Se and the periphery of the sensor mounting portion 8a of the bottom plate 8. In the same figure, reference numeral 8c denotes a through hole through which the first discharge pipe 21 connected to the pump device 19 described later penetrates.

As shown in FIG. 1B, a bottom heat shield for blocking heat from the electric heater 12 downward is provided below the bottom plate 8 on which the electric heater 12 is formed on the lower surface. A plate 17 is arranged. At the center of the bottom heat shield plate 17, a spring member 18 for pressing the bottom sensor 11 upward is attached so that the upper end surface of the bottom sensor 11 is in close contact with the sensor attachment portion 8a of the bottom plate 8.

The lower side of the bottom heat shield 17 is shown in FIG.
As shown in FIG. 2, a pump device 19 is provided on the front side, and an electrical component box 22 containing a control circuit board 21 on which a microcomputer 50 described later is mounted is installed on the back side.

The suction port 19a of the pump device 19 is connected to a first discharge pipe 23a which penetrates through the bottom heat shield plate 17 and the bottom plate 8 and has an upper end joined to the bottom plate 8. Further, a second outlet pipe 23b directed to the front side of the container body 1 is connected to the discharge port 19b of the pump device 19. A liquid pipe 23c extending upward in a space on the front side between the outer case 3 and the inner container 4 is connected to the second discharge pipe 23b.

A bent third pouring pipe 23d is connected to the upper end of the liquid pipe 23c so that the inside of the pouring section 5a of the shoulder case 5 goes forward from below.
A pouring port tube 23e attached to the lower end of the pouring portion d at the lower surface of the pouring section 5a so as to penetrate the surface downward is connected. Thereby, as shown by the arrow in the figure, a pouring passage extending from the bottom of the hot water storage space 1a to the pouring port tube 23e is formed, and the pump device 19 is operated, whereby the hot water in the hot water storage space 1a is actuated. Is poured from the pouring port tube 23e through the pouring passage.
Note that a falling water stop valve 24 is mounted in the third discharge pipe 23d.

The liquid tube 23c is formed of a transparent glass tube, and the outer case 3 is formed so that a part of the region along the liquid tube 23c is transparent. On the outer peripheral surface of the liquid amount pipe 23c, a glass tube heater (a heater for pouring pipe heating) 25 formed in a pattern as shown in FIG. I have. The glass tube heater 25 is composed of a printing heater formed almost in the same manner as the electric heater 12. After forming a heater element layer 25a of Ag / Pd in the above-described pattern on the surface of the glass tube, a crystal is formed on the surface. It is formed by providing a protective insulating layer made of fossilized glass. The glass tube heater 25 has a power consumption of about 2 W.
The resistance value between the two lead wires 26 is set. As will be described later, the glass tube heater 25 is always energized, and thereby heats and keeps hot water in the liquid amount tube 23c.

Further, since the glass tube heater 25 has a zebra pattern extending over substantially the entire vertical direction of the liquid amount tube 23c, it also functions as a water volume scale. That is, when the heater element layer 25a is viewed from the front through the liquid amount pipe 23c, the width of the heater element layer 25a becomes larger below the surface of the hot water due to the lens action of the hot water. Thereby, the amount of hot water in the inner container 4 is visually recognized.

The lid 2 is, as shown in FIG.
An upper plate 31 made of a synthetic resin and a lower plate 32 made of a synthetic resin whose outer peripheral edge is joined to the upper plate 31 by fitting are provided, and the rear end side of the shoulder case 5 (the right end in the figure) Side) is supported by a hinge receiver 33 via a hinge pin 34 so as to be freely openable and closable. On the other hand, on the front end side of the upper plate 31, a lock mechanism 35 for locking the lid 2 to the container body 1 at a closed position (position shown) covering the upper surface opening of the inner container 4 is provided.

A substantially circular opening is formed in the center of the upper plate 31, and a push plate 36 is fitted into this opening. An air-type bellows 37 is disposed below the push plate 36. When the push plate 36 is pushed from above, the bellows 37 contracts and deforms. As a result, air pressurized in the bellows 37 passes through the air path 38. It is supplied into the hot water storage space 1a. Thus, the hot water in the hot water storage space 1a can be poured through the pouring port tube 23e by operating the push plate 36 instead of the operation of the pump device 19 described above.

The hot water storage space 1a side of the air path 38 is formed as a common path with a steam discharge passage 39 that communicates the hot water storage space 1a above the lid 2.
An overturn valve 40 is also mounted in the area of the common path. Further, the communication state between the air path 38 and the steam discharge passage 39 to the hot water storage space 1 a is configured to be automatically switched according to the operation of the bellows 37.

On the other hand, the upper surface side of the pouring section 5a of the shoulder case 5 is formed as an operation display section 41.
The switch substrate 42 is disposed below the switch 1. Operation switches which are pressed down through the wall surface of the pouring section 5a are further attached to the switch board 42. As these operation switches, as shown in FIG. 5, a hot water supply switch 43, an unlock switch 44, a heat retention selection switch 45, a reboil switch 46, a cup timer switch 47 and the like are provided.

FIG. 6 shows a control block diagram of the electric pot. The control circuit board 21 is provided with a microcomputer (hereinafter abbreviated as a microcomputer) 50 as an operation control device. This microcomputer 50 includes:
A predetermined constant-voltage DC power source converted from a commercial power source 51 of AC 100 V through a stabilized power source circuit 52 is supplied.
Before the stabilized power supply circuit 52, the glass tube heater 2 is provided.
5, the glass tube heater 25 is connected to the commercial power supply 5
1 to a predetermined voltage to stabilize the power supply circuit 52
It is configured to also function as a voltage dividing resistor for inputting the voltage to the input terminal. The microcomputer 50 includes an oscillation circuit 53 for generating a predetermined clock signal, and a microcomputer (not shown) connected to a plug (not shown) every time power supply is started.
A reset circuit 54 that resets the reset state to the initial state is connected.

The operation switches 43 to 47 mounted on the switch board 42 are connected to the microcomputer 50, and the bottom sensor 11 is connected to the microcomputer 50. According to an operation signal when each operation switch is operated, and the water temperature detected by the bottom sensor 11, the energization of the electric heater 12 to the water heater 15b is performed via the relay drive circuit 55 and the relay 56, and The energization of the heat retaining heater 15a is controlled by the microcomputer 50 via the triac drive circuit 57 and the triac 58, respectively. The operation of the pump device 19 is controlled via the hot water supply lock circuit 59 and the hot water supply circuit 60.

Note that the power supply frequency is monitored and
An IRQ circuit is further provided for opening and closing 6 at the zero-cross point of the AC commercial power supply 51, and a contact signal circuit 62 for detecting the open / closed state of the relay is provided. A piezoelectric buzzer 63 is connected to the microcomputer 50 for notifying the buzzer by sound, for example, when completing the boiling heating and shifting to a predetermined heat retaining state. Further, in the figure, reference numeral 64 denotes a thermal fuse. FIG. 7 shows an example of a specific circuit configuration corresponding to the above control block diagram.

In the electric pot having the above structure, when water is poured into the inner container 4, the lid 2 is closed, and the plug is connected to the outlet, the energization to the water heater 15b is started. Then, when the boiling is detected, the boiling state is continued for a predetermined time for descaling, and thereafter, the operation is switched from the water heater 15b to the energization to the heat retaining heater 15a to maintain the predetermined heat retaining temperature. Is performed. At this time, the pump device 19 is energized by pressing the hot water supply switch 43 after pressing the lock release switch 44, whereby hot water being kept warm is supplied through the pouring port tube 23e. During this time, the glass tube heater 25 is always energized, whereby the water in the liquid amount tube 23c is also heated and kept warm.

As described above, in the electric pot according to the present embodiment, the electric heater 12 is composed of a printing heater provided directly on the bottom plate 8 of the inner container 4, and the heat retaining heater 15 a and the water heater 15 b are particularly provided. Very thin insulating layer 13 made of crystallized glass
However, there is no void layer or the like that has a large heat flow resistance. Therefore, each heater 15a, 15
Heat is efficiently transferred to the bottom plate 8 when heat is generated by energizing b. For this reason, boiling can be performed in a shorter time by energizing the water heater 15b, and the amount of energization to the heat retaining heater 15a can be kept as small as possible to maintain a predetermined temperature.

Further, since a separate mounting member for mounting the electric heater 12 to the bottom plate 8 is not required, the configuration is simplified, thereby making it possible to reduce the overall manufacturing cost. In addition, the overall weight is reduced, and the weight can be reduced. As a result, for example, the electric pot can be easily carried, and the usability is improved.

Furthermore, since the heat flow resistance is small as described above, even if the temperature difference between the heaters 15a and 15b and the bottom plate 8 is small, the bottom plate 8 is not connected to the heaters 15a and 15b.
A sufficient amount of heat transfer per unit time can be ensured. In other words, since the heaters 15a and 15b can be heated and kept warm at a lower temperature,
At this time, the amount of heat radiation from the electric heater 12 to the lower side is also reduced. As a result, the heat shield ring 9 surrounding the bottom sensor 86 in the conventional electric pot described with reference to FIG.
9 and the substrate heat shield 97 covering the upper surface of the electrical component box 95,
The electric pot of the present embodiment is unnecessary, so that the entire manufacturing cost can be reduced.

Since the bottom wall of the inner container 4 has a flat shape except for the sensor mounting portion 8a at the center of the bottom plate 8,
Easy to clean. In addition, the overall shape can be further reduced by increasing the inner volume on the bottom side.

On the other hand, in the electric pot of this embodiment, since the glass tube heater 25 is provided in the liquid amount tube 23c, the water in the liquid amount tube 23c is also heated and kept warm. As a result, for example, even when pouring after a long-time heat-retention state, sufficiently high-temperature hot water is supplied from the first cup, thereby improving the usability. In addition, since the glass tube heater 25 is provided in the liquid amount tube 23c in a pattern also serving as a water level scale, such a scale is provided on the liquid amount tube 23c.
There is no need to print separately on the surface of the device, which also lowers the overall manufacturing costs.

Further, the glass tube heater 25 is configured to function as a voltage dividing resistor at a stage preceding the stabilized power supply circuit 52 for supplying DC power to the microcomputer 50. Conventionally, a special resistor such as an oxide film resistor has been
0 is provided on the control circuit board 21 attached with
In this case, it has been necessary to prevent the temperature in the electrical component box 22 from becoming excessive, taking into account the amount of heat generated by the resistor. On the other hand, in the electric pot of the present embodiment, the heating and keeping of the hot and cold water in the liquid amount pipe 23c is performed by utilizing the heat generated by the partial pressure resistance, so that unnecessary power consumption is suppressed and the energy efficiency is improved. In addition, since the temperature rise due to the voltage dividing resistance does not occur in the electrical component box 22, the electrical reliability is also improved.

Embodiment 2 Next, another embodiment of the present invention will be described with reference to FIG. For convenience of description, members having the same functions as those of the electric pot of the first embodiment described with reference to FIGS. 1 to 7 are denoted by the same reference numerals, and detailed description is omitted. The same applies to other embodiments described later.

In the electric pot shown in FIG. 8, a space radially inside the bottom bent portion 7b of the outer cylinder 7 in the inner container 4,
That is, the bottom sensor 1 is located between the bottom plate 8 and the bottom heat shield plate 17.
A space excluding the periphery of the first and the periphery of the first discharge pipe 23e connected to the pump device 19 is filled with a heat-resistant heat-insulating material 65. By providing such a heat insulating material 65, heat radiation downward from the electric heater 12 is suppressed, and thereby the heating efficiency of the inner container 4 is further improved.

Further, noise is also prevented by the heat insulating material 65 as described above. That is, when the hot water in the inner container 4 is brought into a boiling state in the water heating operation, a sound is generated along with a large number of bubbles generated on the surface of the bottom plate 8. This resonates with the space below and leaks out to generate noise. In this case, the bottom plate 8
The heat insulating material 65 provided on the lower side also functions as a sound absorbing material, thereby making it possible to prevent generation of noise.

[Embodiment 3] Next, still another embodiment of the present invention will be described with reference to FIG. The electric pot shown in the figure has a bottom bent portion 7 in the outer cylinder 7 of the inner container 4.
b is formed flat, and a bottom plate 8 is welded to the inner end of the bent portion 7b. Thus, a structure in which no downwardly projecting portion exists outside the electric heater 12 formed on the bottom plate 8 in the same manner as described above.

In this case, the inner end side of the bottom bent portion 6b of the inner cylinder 6 is bent downward in a step shape and is welded to the bottom bent portion 7b of the outer cylinder 7. Thus, the first embodiment
Similarly to 2, a space sandwiched between the bottom bent portions 6 b and 7 b of the inner cylinder 6 and the outer cylinder 7 is provided also on the outer peripheral side of the bottom wall of the inner container 4. Is formed.

In the inner container 4 having the above structure, the inner tube 6, the outer tube 7, and the bottom plate 8 are sequentially welded and assembled, and then the electric heater 12 formed of a printing heater is formed on the lower surface of the bottom plate 8. Can be adopted. That is, in the first and second embodiments, since the bottom bent portion 7b of the outer cylinder 7 projects downward from the heater printing surface of the bottom plate 8, the insulating layer 13 and the protection layer are protected by screen printing, for example. Even if it is attempted to print the insulating layer 14 and the heater element layer 15, the screen cannot be brought into close contact with the surface of the bottom plate 8. Therefore, before the bottom plate 8 is welded to the inner cylinder 6, it is necessary to form the electric heater 12 on the surface of the bottom plate 8 and then manufacture the inner container 4 in a process of welding the bottom plate 8 to the inner cylinder 6. Becomes

On the other hand, in the present embodiment, even after the bottom plate 8 is welded to the outer cylinder 7, there is no protruding portion outside the region where the electric heater 12 is formed as described above.
It is possible to print the heater element layer 15 and the like in a predetermined pattern by closely contacting the screen.

Therefore, in the present embodiment, the welding of the inner tube 6 and the outer tube 7 to the bottom plate 8 is performed first as described above, and then the insulating layer 13 is formed on the lower surface of the bottom plate 8, and then the heater element layer 15 is formed. And the protective insulating layer 14 are sequentially printed and dried. Further, these firings are simultaneously performed in a step of forming a space between the inner cylinder 6 and the outer cylinder 7 as the vacuum heat insulating space 8.

That is, in order to provide a vacuum insulation space 9 between the inner cylinder 6 and the outer cylinder 7, the bottom bent portion 7 b of the outer cylinder 7 has
An exhaust hole (not shown) is formed, and the inner container 4 is sent into the vacuum chamber with a sealing material made of, for example, a glass material inserted into the exhaust hole. Thereby, the air in the space 9 is sucked out through the exhaust hole, and in this state, the whole is heated to melt the sealing material, whereby the exhaust hole is sealed, and the space 9 becomes a vacuum heat insulating space. It is formed.

Therefore, in the present embodiment, firing of the heater element layer 15 and the protective insulating layer 14 formed on the bottom plate 8 is performed by
As described above, the inner container including the electric heater 12 is manufactured simultaneously with the heat treatment for heating and melting the sealing material. As described above, the firing of the electric heater 12 is performed simultaneously in the evacuation processing step, so that the number of steps is reduced, which also makes it possible to lower the overall manufacturing cost.

Embodiment 4 Next, still another embodiment of the present invention will be described with reference to FIG. In the electric pot of the present embodiment, as shown in FIG.
The inner container 4 is formed not in a vacuum double structure but in a single structure. Then, the ordinary heat insulating material 66 is wound around the outer periphery of the cylindrical body except for a part of the front side, and the heat resistant heat insulating material 67 is formed along the outer peripheral surface on the lower end side and the bottom of the body. Is provided to keep the hot water in the inner container 4 warm. The lid 2 is not provided with the bellows 37 in each of the above embodiments, and the container main body 1 is not provided.
The pouring is performed by a pump device 19 disposed at the bottom of the pump.

A bottom plate 8 for covering the bottom of the inner container 4
As shown in FIG. 2B, a sensor mounting portion 8a protruding upward as described above is provided at the center portion, and a hot water pool portion 8d recessed downward is provided on the outer peripheral side, and The upper end of the bottom side wall portion 8e extending cylindrically upward from the outer edge of the pool portion 8d is butt-welded to the lower end of the cylindrical body portion 4a above it. The body 4a
Is formed of a stainless steel plate having a thickness of, for example, 0.5 mm and the bottom plate 8 having a thickness of, for example, about 1 mm.

An electric heater 12 composed of a print heater is formed along the outer periphery of the bottom side wall 8e as in the above embodiments. Note that, in this case, the electric heater 12 is provided in a region below the upper end of the electric heater 12 so as to substantially match the liquid level of the hot water remaining in the inner container 4.

That is, the hot water in the hot water pool portion 8d remains without being discharged. More specifically, a flat portion 8f between the sensor mounting portion 8a and the pool portion 8d on the bottom plate 8
Is provided with a short circular tubular joint 8g rising upward so as to surround the first outlet pipe 23a at a portion through which the upper end of the first outlet pipe 23a penetrates. The upper end of the first discharge pipe 23a is fitted into the joint 8g, and the first discharge pipe 23a is
Are joined. Hot water below the upper end surface of this joint will remain, and therefore, as shown by the dashed line in the figure, the upper end of the electric heater 12 substantially matches the height position of the upper end surface of the joint. As shown in FIG.
Are formed on the outer surface of the bottom side wall portion 8e of the bottom plate 8, and thereby, as described later, the electric heater
Overheating is prevented.

According to such a configuration, the electric heater 12
Is provided on the outer periphery of the bottom side of the inner container 4, so that the thermal effect on the pump device 19 and the electrical component box 22 disposed below the inner container 4 is further reduced. As a result, the space in which the components 19 and 22 are disposed below the inner container 4 can be reduced as much as possible, whereby the overall shape can be made more compact. In addition, since the thermal influence on the bottom sensor 11 is reduced, more stable water temperature detection is possible.

The area of the formation area of the electric heater 12 composed of a print heater having good heat transfer efficiency is
By being provided along the outer peripheral surface, the dimension in the height direction can be made as small as possible. Therefore, it is possible to minimize the volume of the space in the above-mentioned pool 8d as much as possible.

That is, if the electric heater 12 is continuously heated while the inner container 4 is running out of hot water and becomes empty, the electric heater 12 may be overheated or disconnected. Therefore, it is necessary to provide a configuration in which the above-mentioned water pool 8d is provided inside the electric heater 12 to suppress overheating of the electric heater 12, but in this case, the space volume in the water pool 8d can be reduced as much as possible. Therefore, the amount of hot water remaining in the space decreases, and the amount of hot water that can be discharged from the inner container 4 increases accordingly, thereby improving the usability.

Although the specific embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various changes can be made within the scope of the present invention. For example, in the above description, the configuration in which the electric heater 12 composed of a printing heater is provided by directly printing on the outer surface of the inner container 4 is shown, but a heater substrate 68 separate from the inner container 4 is provided as shown in FIG. , An electric heater 1 on the surface
After forming 2, the heater substrate 68 is fixed to the mounting angle 69 provided on the lower surface of the bottom bent portion 7b of the outer cylinder 7 of the inner container 4 with screws 70, for example.
It is also possible to adopt a configuration in which the formation surface of the electric heater 12 is in close contact with the bottom wall of the inner container 4.

Also in this case, since the electric heater 12 is formed integrally with the heater substrate 68, the electric heater 12
When mounting the heater substrate 68, it is only necessary to mount the heater substrate 68 as described above, and therefore, the mounting structure is simplified.

On the other hand, in each of the above embodiments, together with the electric heater 12 for heating and keeping the hot water in the inner container 4, the glass tube heater 25 for heating and keeping the hot water in the liquid quantity pipe 23 c is replaced with the heater for pouring piping heating. Although the electric pot provided as an example has been described as an example, it is also possible to adopt a configuration in which only one of the electric heater 12 and the pouring pipe heating heater is provided.

In the configuration in which the above-described heater for pouring piping is provided to heat and maintain the hot water in the liquid amount pipe 23c, the liquid amount pipe 23c is replaced with the liquid amount pipe 23c.
It is also possible to adopt a configuration provided on the outer periphery of a connection pipe connecting the liquid amount pipe 23c and the discharge port 19b of the pump device 19 to the lower side. Even in this case, the liquid amount tube 23
The hot water in c is entirely heated by convection and kept warm.

In this case, instead of the above-described glass tube heater 25 composed of a print heater, for example, FIG.
As shown in (a) and (b), a configuration in which a code heater 71 formed of a wire-shaped resistance heating element is wound may be adopted. FIG. 5A shows a configuration example in which a code heater 71 is wound around the outer periphery of a second discharge pipe 23b between the discharge port 19b of the pump device 19 and the liquid amount pipe 23c. The second outlet pipe 23b is formed of, for example, a tubular packing made of silicone rubber. On the other hand, FIG. 3B shows a configuration example in which a stainless steel connection pipe 72 is further provided between the discharge port 19b of the pump device 19 and the liquid amount pipe 23c, and a cord heater 71 is provided on the outer periphery of the connection pipe 72. Is shown. In these figures, reference numeral 73 denotes a fixing tape for fixing the code heater 71.

On the other hand, in the above, the electric pot provided with the pump device 19 and the air type bellows 37 and the pump device 19
Although the electric pot provided with only the air-type bellows has been described as an example, the electric pot provided with only the air-type bellows is also provided with the electric heater 12 composed of the printing heater described in each of the above-described embodiments and the heater for pouring piping heating. It is possible to configure.

[0094]

As described above, in the electric hot water storage container according to the first aspect of the present invention, since the electric heater is constituted by a printed heater integrated on the surface of the heater base material, the heater base material can be of a predetermined type. In this case, a special mounting member for the electric heater is not required. This makes it possible to reduce the size and weight of the device, so that it is easy to carry and the like, and the usability is improved.

In the electric hot water storage container according to the second aspect, since the electric heater is provided with the insulating protection insulating layer covering the surface of the heater element layer, deterioration of characteristics due to moisture absorption and the like is suppressed, and stable electric heating is achieved. Characteristics and electrical insulation performance can be maintained.

In the electric hot water storage container according to the third aspect, since the heater element layer is formed on the surface of the heater base made of stainless steel plate via the insulating layer, the entire heater base functions as a hot plate. Thereby, the hot and cold water in the inner container can be uniformly heated over a wider area, so that the heating efficiency is improved.

In the electric hot water storage container according to the fourth aspect, since the electric heater is formed in the flat region of the bottom plate of the inner container, the mounting member for the electric heater is not required at all, and the heat transfer efficiency is further improved. Therefore, it is possible to further reduce the size and weight of the overall shape.

In the electric hot water storage container according to the fifth aspect, the flat region where the electric heater is formed is formed so as to be located at the lowest position in the bottom plate portion of the inner container. After forming the heater, a heater element layer or the like can be printed by screen printing to form an electric heater, so that the degree of freedom in manufacturing is improved.
As a result, the overall manufacturing cost can be reduced.

In the electric hot water storage container according to the sixth aspect, since the heat insulating material is provided below the bottom plate portion, the heating efficiency is further improved. Further, the sound that leaks downward from the bottom plate portion when the water in the inner container boils can be suppressed by the heat insulating material, and the generation of noise can be suppressed.

In the electric hot water storage container according to the seventh aspect, since the electric heater is formed in the outer peripheral region on the bottom side of the body of the inner container, the temperature sensor for detecting the temperature of hot water and the electric component below the inner container. Even in the case of disposing the boxes, the electric heaters are located farther away from the boxes, and therefore, it is possible to make them closer to the bottom of the inner container, which can further reduce the size.

In the electric hot water storage container according to the eighth aspect, since the residual water storage portion is provided inside the electric heater, even if the electric heater is energized when the hot water in the inner container has been used up, the electric water heater is not charged. Disconnection or the like due to overheating of the electric heater is prevented. In addition, since the heating efficiency of the electric heater composed of the printing heater is good, the dimensions of the electric heater can be reduced as much as possible, and the space volume of the residual water storage section can be reduced accordingly. However, the amount of hot water remaining in this portion also decreases, and the amount of hot water that can be discharged from the inner container increases accordingly, thereby also improving the usability.

In the electric hot water storage container according to the ninth aspect, the electric heater is provided in a region below the height position substantially equal to the level of the hot water remaining in the inner container. The cooling action of the hot and cold water is surely performed, and therefore, the overheating of the electric heater during the idle heating is more reliably prevented.

In the electric hot water storage container according to the tenth aspect, when the material for forming the inner container is welded to form the inner container, the electric heater is provided on the surface of the region other than the welded portion. For example, at the time of printing, the electric heater having the desired characteristics can be formed more accurately without being affected by the unevenness of the welded portion.

In the electric hot water storage container according to the eleventh aspect, a heater base is provided separately from the inner container, and an electric heater is formed on the heater base and attached to the outer surface of the inner container. If you install the material along the outer surface of the inner container,
Since a special mounting member for the electric heater is not required separately,
The overall shape can be made compact and lightweight.

In the electric hot water storage container according to the twelfth aspect, since a heater for pouring pipe heating for heating and keeping hot water in the pouring passage is provided, for example, the hot water is supplied from the first cup even after keeping the temperature for a long time. Can be heated, thereby improving the usability.

In the electric hot water storage container according to the thirteenth aspect, the heater for pouring the hot water supply pipe serves as a voltage dividing resistor for reducing the voltage of the commercial AC power supply to a predetermined voltage and inputting it to the stabilized power supply circuit. With the configuration, useless power consumption is suppressed, and energy efficiency is improved.

In the electric hot water storage container according to the fourteenth aspect, the heater for heating the pouring pipe formed of a printing heater is formed on the outer surface of the liquid quantity pipe, and this also serves as a water level scale. In addition, the overall manufacturing cost can be reduced.

[Brief description of the drawings]

1A and 1B show an electric pot according to an embodiment of the present invention, in which FIG. 1A is a longitudinal sectional view showing an entire configuration, and FIG. 1B is a rear side configuration around a bottom plate of an inner container. It is an expanded sectional view.

FIG. 2 is an enlarged schematic sectional view showing an electric heater formed on the bottom plate.

FIG. 3 is a plan view of a bottom plate for explaining a pattern shape of the electric heater.

FIG. 4 is a rear view of a liquid amount pipe provided in the electric pot.

FIG. 5 is a plan view of the electric pot as viewed from above.

FIG. 6 is a control block diagram of the electric pot.

FIG. 7 is a control circuit diagram of the electric pot.

FIG. 8 is a cross-sectional view of a main part showing a configuration of a bottom side of an electric pot according to another embodiment of the present invention.

FIG. 9 is a cross-sectional view of a main part showing a configuration of a bottom portion of an electric pot according to still another embodiment of the present invention.

10A and 10B show an electric pot according to still another embodiment of the present invention, wherein FIG. 10A is a longitudinal sectional view and FIG.
FIG. 3 is an enlarged sectional view showing a bottom front surface side.

FIG. 11 is a cross-sectional view of a main part showing a bottom rear surface side of an electric pot according to still another embodiment of the present invention.

FIG. 12 shows a mounting state of a heater for heating a pouring pipe according to still another embodiment of the present invention. FIG. 12 (a) shows a state where the heater is provided in a second discharging pipe below a liquid quantity pipe. FIG. 4B is a cross-sectional view showing an example in which a connection pipe is further provided below the liquid amount pipe and the heater is attached.

FIG. 13 shows a conventional electric pot, and FIG.
Is a longitudinal sectional view showing the entire configuration, and FIG. 4B is an enlarged sectional view showing the configuration on the bottom rear side.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Container main body 4 Inner container 8 Bottom plate (heater base material) 8c Flat part (flat area) 8d Hot water pool part 11 Bottom sensor (temperature sensor) 12 Electric heater 13 Insulating layer 14 Protective insulating layer 15 Heater element layer 23c Liquid level tube 25 Glass tube heater (heater for pouring piping heating) 25a Heater element layer 50 Microcomputer (operation control device) 51 Commercial power supply 52 Stabilized power supply circuit

Claims (14)

[Claims] 1. An electric hot water storage container comprising: a container for storing hot water; and an electric heater which is energized to heat and keep the water in the container in the container main body. An electric hot water storage container comprising a print heater formed by printing a heat generating heater element layer on a surface of a heater base material in a predetermined pattern and firing the same. 2. The electric hot water storage container according to claim 1, further comprising an insulating protective layer covering a surface of said heater element layer. 3. The electric hot water storage container according to claim 1, wherein the heater base is made of a stainless steel plate, and a heater element layer is formed on a surface of the heater base via an insulating layer. 4. The electric hot water storage container according to claim 3, wherein a flat region in a bottom plate portion of the inner container is used as the heater base material, and the electric heater is formed in the flat region. 5. The electric hot water storage container according to claim 4, wherein the bottom plate of the inner container is formed in a shape such that the flat region is located at the lowest position in the bottom plate. 6. The electric hot water storage container according to claim 4, wherein a heat insulating material is provided below the bottom plate portion. 7. The electric hot water storage container according to claim 3, wherein the outer peripheral region on the bottom side of the inner container body is used as the heater base material, and the electric heater is formed in the outer peripheral region. 8. A residual water storage portion which is recessed downwardly on the outer peripheral side of the bottom of the inner container, and the electric heater is formed on the outer periphery of the lower end side of the body surrounding the residual water storage portion from the outside. The electric hot water storage container according to claim 7, characterized in that: 9. The electric hot water storage container according to claim 8, wherein the electric heater is provided in a region below a height position substantially equal to a level of hot water remaining in the inner container. 10. An inner container is formed by welding a material for forming an inner container into a bottomed cylindrical shape, and the electric heater is provided on a surface of a region other than a welded portion of the inner container. The electric hot water storage container according to any one of claims 4 to 9, wherein 11. A heater base provided separately from the inner container,
4. The electric hot water storage container according to claim 1, wherein an electric heater is formed on the container and attached to an outer surface of the inner container. 12. An inner container for storing hot water and an electric heater which is energized to heat and keep the water in the inner container in a container main body, and a side of the inner container is arranged from the bottom of the inner container. An electric hot water storage container provided with an upwardly extending pouring passage, wherein a hot water supply pipe heater for heating and keeping hot water in the pouring passage is provided. . 13. An operation control device for controlling energization of the electric heater, and a stabilizing power supply circuit for converting a commercial AC power supply to a predetermined DC power supply and supplying the DC power supply to the operation control device, wherein the pouring pipe is provided. This pouring pipe heating heater is connected in front of the stabilized power supply circuit so that the heating heater becomes a voltage dividing resistor for reducing the voltage of the commercial AC power supply to a predetermined voltage and inputting it to the stabilized power supply circuit. The electric hot water storage container according to claim 12, wherein 14. A liquid flow tube which is visible from the outside of the container body in a pouring passage, and is formed by printing and firing a heater element layer which generates heat when energized on the outer surface of the liquid flow tube. 14. The electric heater according to claim 12, wherein the printing heater is provided as the heater for heating the pouring pipe, and the heater element layer is formed in a pattern in which the level of hot water in the liquid amount pipe can be visually recognized. Hot water storage container.