JP2008006033A - Electric kettle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an efficient electric kettle for heating a liquid in an inner container to a desired temperature by reducing the size of the mouth of the inner container and further reducing the diameter of a heater below the size of the mouth, having an excellent warming effect, and suppressing power consumption. <P>SOLUTION: The electric kettle 1 includes the inner container 3 having a single inner wall 3a at the center of the bottom, and a vacuum double structure of the inner wall 3a and an outer wall 3b at the outside bottom and a barrel portion, a flat heater 4 for heating the liquid in the inner container, a press plate 19 for pressing the flat heater, a shielding plate 21 for pressing the press plate, and a temperature adjuster 12 for detecting the temperature of the liquid. The flat heater 4 is covered by heater covers 4a at the upper and lower surface in a sandwich. The outer diameter of the outer peripheral end of the upper surface of the heater cover is configured not to make contact with an arcuate corner 3i between an abutment surface 3f for the heater and a hanging wall 3j for the heater. The heater cover 4a has a thickness slightly larger than that between the abutment surface 3f and an abutment surface 3g for the press plate, the shielding plate 21 covers a hanging wall 3l for the press plate to be flush with the lower surface of the hanging wall for the press plate. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an electric water heater in which a heater is provided at the bottom of an inner container having a single bottom and an outer bottom and a double body vacuum to boil and keep the liquid in the inner container.

Conventionally, as an electric water heater, an inner container in which the center of the bottom part is a single inner wall, the bottom outer part and the body part are inner and the outer wall is a vacuum double is provided, and a planar heater is stretched on the inner container bottom part. Japanese Unexamined Patent Publication No. 2005-323704 (Patent Document 1, FIG. 1) discloses an electric water heater having a structure in which a cover is pressed by a cover, a bottom wall of a heater cover is pressed by a shielding plate, and the shielding plate is screwed to a double wall portion outside the bottom. To FIG. 6).

Japanese Patent Laying-Open No. 2005-323704 (see FIGS. 1 to 6)

Hereinafter, a conventional electric water heater will be described with reference to FIGS.
This electric water heater of Patent Document 1 is provided with an inner container 3 surrounded by an outer case 2 and having a single bottom part, a bottom outer part and a body vacuum double, and has a smaller diameter than the outer diameter of the inner part of the inner container. The bottom single wall portion is provided with a diameter smaller than the mouth, and the single wall portion is expanded downward in a step shape, and a temperature controller 8 for sensing the liquid temperature in the inner container is provided at the lower center of the temperature controller. The heater 7 for boiling the liquid in the inner container and keeping the temperature around is provided.

Furthermore, this type of electric water heater will be described with reference to a partial schematic view (see FIGS. 7 and 8) showing a conventional inner container bottom portion shown in the present invention in a common range.
The bottom single wall portion of the inner container is expanded downward in a stepped shape, the temperature controller contact wall 3e at the center, the heater contact wall 3f that contacts the heater 7 around the temperature controller contact wall, and the heater A heater hanging wall that hangs down from around the abutting wall, a heater pressing plate abutting wall 3g that extends outward around the heater hanging wall and contacts the heater pressing plate 11, and a pressing that hangs down from around the heater pressing plate abutting wall A plate hanging wall and an outer peripheral bottom wall that is a double wall portion of the bottom extending outwardly around the push plate hanging wall are sequentially provided, and the corners of the heater abutment wall and the heater push plate abutment wall face inward It is provided in a circular arc shape.

However, in this electric water heater, the diameter of the single wall portion must be made smaller than the mouth of the inner container when welding the single wall and the double wall of the bottom part, and the heater is boiled to increase heat retention efficiency. Since the diameter of the planar heater is made as large as possible so that it can enter the heater hanging wall without any gap, the heater reaches the arcuate portion of the corner between the heater abutment wall and the heater push plate abutment wall. Even if the outer peripheral wall reaches and is pressed by the heater cover or heater pressing plate, there is a gap between the heater upper surface and the heater abutting wall, and there is a problem that the surface is not sufficiently contacted and the heat efficiency is very poor. there were.

In the present invention, the center of the bottom is single-layered with the inner wall 3a, the bottom outside and the body is vacuum doubled with the inner 3a and the outer wall 3b, the mouth is smaller in diameter than the outer diameter of the body, and the single-wall portion of the bottom is the mouth The inner container 3 having a diameter smaller than the diameter of the inner container 3 is provided, the planar heater 4 for heating the liquid in the inner container is provided, the pressing plate 19 for pressing the planar heater, and the shielding plate 21 for pressing the pressing plate are provided. The temperature adjuster 12 for sensing the liquid temperature in the inner container is provided, the single wall portion of the inner container bottom is expanded downward, and the temperature controller contact surface 3e and the temperature controller contact The heater contact surface 3f that hangs down from around the surface, contacts the heater, the heater suspending wall 3j that hangs down from an arc-shaped corner around the heater contact surface, and extends outward around the heater suspending wall. A pressing plate contact surface 3g connected to the double plate portion and contacting the pressing plate 19; A push plate hanging wall 3l that hangs down from around the abutting surface, and extends outward around the push plate hanging wall to form a double wall portion at the bottom of the inner container, and an outer case 2 surrounding the inner container is provided. In the electric water heater 1 in which the shoulder member 5 is coupled to the upper end of the case, the lid 6 for opening and closing the mouth of the inner container is provided in the center of the upper end of the shoulder member, and the bottom member 7 is coupled to the lower end of the outer case. The heater 4 has a thin flat plate 4a1 on its upper surface and a lower surface covered with a heater cover 4a of a thick flat plate 4a2 in a sandwich shape. The outer peripheral edge of the upper surface of the heater cover is a contact surface 3f for heater and a hanging wall 3j for heater. The heater cover 4a is provided with an outer diameter of the corner 3i that does not hang over the arc shape, and the heater cover 4a is slightly thicker than the heater contact surface 3f than the press plate contact surface 3g. Shield plate that presses the push plate 19 1 covers around a hanging wall 3l push plate has a configuration provided on the push plate for downward wall lower surface flush.

The present invention solves the conventional problems, and even if the mouth of the inner container is narrowed and the diameter of the heater is smaller than the mouth, the liquid in the inner container can be sufficiently heated to a desired temperature, It is highly effective and can suppress the control of useless power consumption and make it efficient.

The electric water heater 1 is detachably attached to the inner container 3 surrounded by the outer case 2, the heater 4 for heating the liquid in the inner container, the shoulder member 5 coupled to the upper end of the outer case, and the center of the upper end of the shoulder member. A lid body 6 that is mounted and opens and closes the mouth of the inner container, a bottom member 7 coupled to the lower end of the outer case, a discharge mechanism 9 that discharges the liquid in the inner container to the outside via the electric pump 8, and the inner container The main board 10 is configured to sense and control the liquid temperature inside.

As shown in FIGS. 1 and 2, the outer case 2 is made of metal or synthetic resin and is formed in a cylindrical shape with the front surface recessed inward, and has a size that allows the body of the inner container 3 to be freely inserted. It has an inner diameter.
A front end upper surface of the exterior case 2 protrudes outward so as to cover a lower surface of a collar portion of a shoulder member 5 described later, and an opening for a discharge pipe of a discharge mechanism 9 described later is provided on the protruding lower end wall.

As shown in FIG. 2, the inner container 3 is provided with a bottomed cylindrical inner wall 3a made of a metal material such as stainless steel, and a cylindrical outer wall 3b larger than the inner wall, and a bottom portion separated from the bottom center of the inner wall 3a. The bottom of the outer wall 3b is welded to the outer side wall, the mouth of the inner wall 3a is squeezed inwardly, and the tip of the inner wall 3b is widened outwardly to provide an inner wall flange. The inner wall flange portion and the outer wall flange portion are welded together, the inner and outer walls are evacuated, and the bottom single wall forms a trunk vacuum double wall.
The inner diameter of the inner wall 3 a of the inner container 3 is formed to be larger than the outer diameter of the single wall portion at the bottom of the inner container 3.

As shown in FIGS. 4 and 5, the bottom portion of the inner container 3 composed of the inner wall 3a and the outer wall 3b is expanded downward in the shape of a step downward from the center, and contacts the temperature controller 12 described later on the center lower side. A heater surface depending on the contact surface 3e and the heater contact surface 3f that contacts the heater 4 and the inner arc-shaped corner 3i around the heater contact surface. A hanging wall 3j, a pressing plate contact surface 3g that spreads outward around the heater hanging wall, welds an inner bottom surface 3k of the outer wall 3b, and contacts a pressing plate, which will be described later, on its lower surface, and a pressing plate contact surface And a push plate hanging wall 3l that hangs down from the periphery of the inner wall, and extends outwardly around the pushing plate hanging wall and continues to the double wall portion 3h at the bottom of the inner container.

A pipe-shaped lower cylinder 13 that communicatively communicates with the inside of the inner container and communicates with the outside is suspended from a front portion of the heater contact surface 3f at the bottom of the inner container.
As shown in FIG. 4, the outer wall 3 b of the inner container is provided with a bottom part and a body part as separate members, and both members are welded on the outer side of the lower end to form an outer wall. Even if the bottom part and the body part are integrally molded, there is no problem. On the inner bottom surface 3k of the inner container outer wall 3b, screw angles that are coupled with screw joints 21d of a shielding plate 21 described later are provided at circumferential intervals.

The heater 4 for heating the liquid in the inner container 3 is provided with two phases of a main heater for boiling and a sub-heater for heat insulation, is provided in a donut shape with a thin flat plate, and is covered with a heater cover 4a. Yes.
The heater cover 4a is composed of a thin flat plate 4a1 and a thick flat plate 4a2 at the upper portion made of an aluminum material having good heat conduction, and the upper portion is a thin flat plate 4a1 and the lower portion is thick as shown in FIGS. The heater 4 is sandwiched between the flat plates 4a2, the inner peripheral edge and the outer peripheral edge of the thin flat plate are suspended, and the heater 4 and the thick flat plate 4a2 are clamped and fixed from the inner and outer sides.

As shown in FIGS. 3 and 4, the outer diameter of the heater cover 4a is such that the outer peripheral end of the upper surface is hung on the inner arcuate portion of the corner 3i between the heater contact surface 3f of the inner container bottom and the heater hanging wall 3j. The heater contact surface and the upper surface of the thin flat plate 4a1 of the heater cover are in surface contact with each other without any gap.

In the heater cover 4a, as shown in FIG. 5, the entire thickness of the heater cover covering the heater 4 is slightly lower than the pressing plate contact surface 3g at the bottom of the inner container and is pressed by a pressing plate described later. In this state, the heater contact surface 3f at the bottom of the inner container and the upper surface of the heater cover are provided so as to be surely in surface contact with each other.

As shown in FIGS. 3 to 5, the pressing plate 19 is provided in a thin donut shape with a metal material, and the upper surface of the peripheral end is in contact with the pressing plate contact surface 3 g at the bottom of the inner container.
The pressing plate 19 is not fixed and is pressed against the pressing plate contact surface by a shielding plate described later.

The heat of the heater 4 passes through the heater contact surface 3f at the bottom of the inner container that is in contact with the thin flat plate 4a1 at the top of the heater cover 4a, heats the liquid in the inner container, and at the outer peripheral end of the heater cover and the heater Heat is radiated to a gap formed between the hanging wall 3j and the inner upper surface of the pressing plate 19 in contact with the pressing plate contact surface 3g, and the liquid in the inner container is heated via the heater hanging wall 3j. At the same time, the thick flat plate 4a2 of the heater cover, the push plate 19 and the shielding plate described later can surely prevent the heat from being dissipated to the lower portion, which is excellent in the heat retaining effect, and is efficient in suppressing wasteful power consumption. It is supposed to be.

As shown in FIGS. 3 to 6, the shielding plate 21 that presses the pressing plate 19 from the lower side is provided in a donut shape with a thin flat plate made of a metal material or the like, and a contact portion 21 a that contacts the pressing plate, An inclined portion 21b extending obliquely downward from the outer peripheral end of the contact portion and a flange portion 21c extending outward from the outer end of the inclined portion are integrally formed. 21d is a screw joint 21d that abuts against a plurality of screw angles provided on the inner bottom surface 3k of the outer wall 3b of the inner container bottom and fixes the pressing plate to the outer wall of the inner container bottom.

When the shielding plate 21 is fixed to the outer wall 3b, the pushing plate 19 is pushed upward, and the upper surface of the heater cover 4a is pressed tightly against the heater contact surface 3f at the bottom of the inner container. At this time, the bottom surface of the flange portion 21c of the shielding plate and the push plate hanging wall 3l are flush with each other, thereby facilitating the shape and attachment of the later-described fixing plate.

The fixing plate 22 fixed to a plurality of screw angles provided on the inner bottom surface 3k of the outer wall 3b below the shielding plate 21 is disposed at a distance from the shielding plate. The board and electric pump are fixed.

The temperature controller 12 is formed of a thermistor or the like, and is inserted through the donut-shaped central openings of the shielding plate 21, the push plate 19 and the heater cover 4 a without any gaps, thereby blocking heat dissipation from around the temperature controller. The upper end surface of the inner container 3 is fixedly held by the shielding plate 21 in close contact with the temperature adjuster contact surface 3e of the bottom wall of the inner container 3.

The bottom member 7 that covers the bottom of the inner container 3 is a flat plate made of metal or synthetic resin, and the outer case is rotatable by contacting the lower end of the outer case 2 to the outer peripheral end.

The shoulder member 5 coupled to the upper end of the exterior case 2 is provided with an opening having a central opening up and down, a flange 17 extending forward is provided on the front surface of the opening, and a hinge 18 is provided on the rear surface of the opening. The inner container flange portion extending toward the inner center is provided at the lower portion of the peripheral wall forming the opening.

An L-shaped seal packing is stretched on the inner container flange portion of the opening, and the outer wall flange portion of the inner container 3 is in contact with the seal packing.
The lid 6 pivotally supported by the hinge portion 18 of the shoulder member 5 is attached to the opening so as to be freely opened and closed. Reference numeral 38 denotes a handle.

The operation unit 11 of the electric water heater 1 includes an operation panel of the collar unit 7, an operation sticker attached to the upper surface of the operation panel, a central liquid crystal panel 29, and each of the switches 30, 30 and surrounding lighting. It comprises an operation board on which the lamps 31 and 31 for display are arranged, and a board box that houses the operation board and fits into the inner wall of the operation panel.

The operation board projects a liquid crystal panel 29 that displays the liquid temperature in the inner container at the center of the surface, and switches 30 and 30 for boiling, heat retention, and discharge around the lower side of the liquid crystal panel, The lamps 31 and 31 are projected, and a computer chip, a connector and the like are also arranged on the surface.
The operation board is connected and wired to a main board 10 described later, and operations on the operation board are performed by computer control of the main board.

The main board 10 that senses the liquid temperature in the inner container 3 and turns the heater 4 on and off by computer control is located between the inner container 3 and the bottom member 7 and is housed in the main board storage box. The computer of the main board is controlled by the operation of the operation unit 11, and the heater 4 and the discharge mechanism 9 are operated.

The discharge mechanism 9 sucks up the liquid in the inner container 3 and discharges the liquid from the tip of the discharge pipe 35 to the outside. The discharge mechanism 9 is between the discharge pipe 35 and the electric pump 8 and displays the amount of liquid in the inner container 3. An amount-indicating pipe (not shown), a tip-over water stop portion 36 between the liquid amount-indicating pipe and the discharge pipe 35 for stopping the liquid in the liquid amount-indicating pipe at the time of overturning and preventing outflow from the discharge pipe 35; Each joint pipe (not shown) for connecting the lower cylinder 13 of the inner container 3 and the electric pump 8, connecting the electric pump and the liquid amount indicating pipe, and connecting the liquid amount indicating pipe and the tipping water stop portion It is made up of.

The lid body 6 pivotally supported by the hinge portion of the shoulder member 5 includes an upper lid, a lower lid, and a metal cover plate that covers the lower surface of the lower lid and closes the opening 16 of the shoulder member 5.

Although the embodiments considered to be representative of the present invention have been described above, the present invention is not necessarily limited only to the structures of these embodiments, and includes the above-described constituent features according to the present invention and also refers to the present invention. The present invention can be carried out with appropriate modifications within the scope of achieving the object and having the effects referred to in the present invention.

The perspective view of this invention Example. The center longitudinal cross-sectional view of an Example of this invention. The disassembled perspective view which shows the bottom part of this invention Example. The partial schematic diagram which shows the inner container bottom part of this invention Example. The A section enlarged view of FIG. The partially expanded schematic diagram which shows the pre-assembly of the inner container bottom part of this invention Example. The partial schematic diagram which shows the conventional inner container bottom part. The B section enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric water heater 2 ... Outer case 3 ... Inner container 3a ... Inner wall 3b ... Outer wall 3e ... Temperature controller contact surface 3f ... Heater contact surface 3g ... Push plate contact surface 3h ... Double wall of inner container bottom Part 3i ... Corner 3j ... Heater hanging wall 3k ... Inner bottom surface 3l of outer wall ... Push plate hanging wall 4 ... Heater 4a ... Heater cover 4a1 ... Thin flat plate 4a2 ... Thick flat plate 5 ... Shoulder member 6 ... Lid 7 ... Bottom member 8 ... Electric pump 9 ... Discharge mechanism 10 ... Main substrate 11 ... Operating part 12 ... Temperature controller 13 ... Lower cylinder 17 ... Ring 18 ... Hinge part 19 ... Pushing plate 21 ... Shielding plate 21a ... Abutting part 21b ... Inclined portion 21c ... Flange portion 21d ... Screw joint 22 ... Fixing plate 29 ... Liquid crystal panel 30, 30 ... Switch 31, 31 ... Lamp 35 ... Discharge pipe 36 ... Tipping water stop portion 38 ... Handle

Claims (1)

The bottom center is a single inner wall (3a), the bottom outside and the body is inner (3a), the outer wall (3b) is vacuum double, the mouth is smaller in diameter than the outer diameter of the body, and the bottom single wall Is provided with an inner container (3) having a diameter smaller than the diameter of the mouth, a planar heater (4) for heating the liquid in the inner container, and a pressing plate (19) and a pressing plate for pressing the planar heater And a temperature controller (12) that senses the temperature of the liquid in the inner container, and a single wall portion at the bottom of the inner container is expanded in a stepped downward direction to adjust the temperature to the lower center. A heater contact surface (3e), a heater contact surface (3f) that comes down from around the temperature controller contact surface, and a heater that comes down from an arcuate corner around the heater contact surface The hanging wall (3j) for the heater and the outer wall around the hanging wall for the heater are spread outward and are connected to the double wall portion and the push plate (1 ) And a pressing plate hanging wall (3l) that hangs down from around the pressing plate contacting surface, and expands outward around the pressing plate hanging wall. A double wall part at the bottom of the vessel, provided with an outer case (2) surrounding the inner container, a shoulder member (5) coupled to the upper end of the outer case, and a lid (opening and closing the mouth of the inner container at the center of the upper end of the shoulder member) 6) In the electric water heater (1) in which the bottom member (7) is coupled to the lower end of the outer case, the planar heater (4) has a thin flat plate (4a1) on the top surface and a thick bottom surface. The heater cover (4a) of the flat plate (4a2) is covered in a sandwich shape, and the outer peripheral end of the upper surface of the heater cover is arcuate at the corner (3i) between the heater contact surface (3f) and the heater hanging wall (3j). The heater cover is provided on the outer diameter of the heater cover and the heater cover (4a) is thick. The heater contact surface (3f) is slightly thicker than the thickness between the press plate contact surfaces (3g), and the shielding plate (21) for pressing the press plate (19) is around the press plate hanging wall (3l). An electric water heater characterized by being provided flush with the bottom surface of the hanging wall for the push plate.

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