JP2012125464A - Electric kettle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric kettle that has a light and simple vessel body, increases heat-retaining properties in a safe form as much as possible, and also reduces the amount of remaining hot water in pouring.SOLUTION: The electric kettle includes: a liquid vessel in vacuum double wall structure comprising an inner cylinder and an outer cylinder; a heater that is at the bottom of the liquid vessel and heats the liquid vessel; and a bottom member for covering the heater. In the electric kettle, an outer shell part of the electric kettle body is formed from the outer cylinder of the liquid vessel, and the bottom member covers the bottom and side of the liquid vessel.

Description

  The present invention relates to a configuration of an electric kettle that can be simply and quickly heated.

  Recently, instead of an electric pot that needs to be energized at all times, there is an electric kettle that can easily and quickly boil by energizing heating means only when hot water is required. It is useful as a water heater with high energy saving performance.

  Such an electric kettle is provided on the bottom of the liquid container and the heater main body having a heater for heating the liquid container, and the water heater main body is detachably mounted. In the state where the water heater body is placed, the power supply unit includes a power supply unit that includes a power supply unit that supplies power to the heater on the water heater body side (Patent Document 1).

  Such a liquid container is generally composed of a single-walled metal (or synthetic resin) container itself (Patent Document 2, Patent Document 3) or a single-walled metal container as an inner container. In most cases, a synthetic resin outer cover is provided on the outer periphery (Patent Document 1).

JP 2008-212316 A JP 2010-527660 A JP 2009-285170 A

  By the way, in the case of a liquid container having a single wall structure as described above and having no outer cover, the temperature of the hot water after boiling is directly transmitted to the outer peripheral surface of the container, so that the outer peripheral surface becomes hot and handling is necessary.

  Further, in the case where an outer cover is provided with a container having the same heavy wall structure as an inner container, the outer peripheral surface of the container is not heated unlike the above-described one, so that it is safe and easy to handle.

  However, in any of these cases, since the container itself does not have heat retention, there is a problem that the hot water after boiling is easy to cool.

  Therefore, the liquid container is a liquid container having a vacuum double wall structure including an inner cylinder and an outer cylinder, and a heater for heating the liquid container and a bottom member for covering the heater are provided on the bottom side of the inner cylinder of the liquid container. It is conceivable to have a configuration.

  When such a configuration is adopted, heat retention is realized, and the product function of the electric kettle is improved.

  However, in the case where such a liquid container having a vacuum double wall structure is configured, if these are used as inner containers and an outer cover is further provided, the member cost increases, and the container body portion is more than necessary. Since the outer diameter increases, the structure becomes complicated and the weight increases.

  Therefore, the outer cover is further abolished, and the outer cylinder portion of the liquid container having the vacuum double wall structure forms the outer shell portion of the container body, thereby simplifying the structure, reducing the diameter, reducing the weight, and reducing the It may be possible to reduce costs. In this way, the design is also improved.

  However, when the outer cylinder itself of the vacuum double container is used as the outer shell part of the container body, heat from the inner cylinder side is transmitted to the lower end side of the outer cylinder joined and integrated to the bottom of the inner cylinder, A new problem arises that gets hot.

  The present invention has been made in order to solve the above-described problems. The outer cylinder of a liquid container having a heat-retaining vacuum double wall structure is used as an outer shell portion of the electric kettle body, and the like. Aiming to provide an electric kettle that reduces the weight and simplification of the kettle body, improves the heat retention in a safe form as much as possible, and reduces the amount of hot water remaining when pouring. It is.

  In order to achieve the above object, each invention of the present application includes the following problem solving means.

(1) Invention of Claim 1 An electric kettle according to the present invention comprises a liquid container having a vacuum double wall structure comprising an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, An electric kettle comprising a bottom member covering the heater, wherein the outer cylinder side of the liquid container forms an outer shell portion of the electric kettle body, and the bottom member portion is the bottom and side surfaces of the liquid container It is characterized by covering the part.

  As described above, when a liquid container having a vacuum double wall structure composed of an inner cylinder and an outer cylinder is used as a liquid container for an electric kettle, the heating efficiency at the time of boiling water is improved and the temperature can be kept after boiling. Convenience is improved.

  In that case, if the outer cylinder side of the vacuum double-walled liquid container forms the outer shell portion of the electric kettle body, complete insulation is achieved without having to provide a separate outer cover. Therefore, it is possible to make the container main body simple and lightweight as compared with the case of providing a separate dedicated outer cover.

  On the other hand, in such a case, heat from the inner cylinder bottom part of the single wall corresponding to the heater is easily transmitted to the outer cylinder bottom part, and the temperature is likely to rise.

  Thus, as described above, the bottom member portion is configured to cover the bottom and side portions where the temperature of the liquid container outer cylinder is likely to rise, so that it is safe even if touched by the user.

(2) Invention of Claim 2 An electric kettle of the present invention comprises a liquid container having a vacuum double wall structure comprising an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, An electric kettle comprising a bottom member that covers the heater, wherein the opening of the liquid container is formed to be deviated toward the outer spout side.

  As described above, when the opening of the liquid container is formed so as to be deviated toward the outer side of the outlet, the liquid container can be more effectively dispensed even when the remaining amount is reduced. Even when a reduced diameter portion for heat keeping is provided in the opening, the remaining amount of hot water can be reduced as much as possible.

(3) Invention of Claim 3 The electric kettle of the present invention comprises a liquid container having a vacuum double wall structure comprising an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, An electric kettle comprising a bottom member that covers a heater, wherein the liquid container has a shoulder member at an upper end side opening, and the shoulder member and the bottom member are integrally connected to each other by a predetermined connecting member. It is characterized by becoming.

  Thus, when the liquid container has a shoulder member at the upper end side opening and a bottom member at the lower end side bottom, and the shoulder member and the bottom member are connected and integrated with each other by a predetermined connecting member, Even when the liquid container is reliably held between the two and the outer cylinder side of the liquid container forms the outer shell of the electric kettle body, a stable main body structure can be realized.

(4) Invention of Claim 4 In the electric kettle of the present invention, in the configuration of the invention of Claim 1, 2, or 3, the lower end of the outer cylinder of the liquid container extends downward from the heater at the bottom of the liquid container. Then, it is joined to the bottom of the inner cylinder, and a vacuum heat insulating space is formed on the outer periphery of the lower part of the inner cylinder.

  In this way, the lower end of the outer cylinder of the liquid container extends below the heater at the bottom of the liquid container and is then joined to the bottom of the inner cylinder, thereby providing a vacuum heat insulating space on the lower outer peripheral side of the inner cylinder. If it does, the heat insulation of the lower part of an inner cylinder and heat insulation property will improve, and the heating efficiency at the time of boiling water and the heat insulation efficiency at the time of heat insulation will improve.

  Further, since the vacuum heat insulating space surrounds the outer periphery of the heater, the heat of the heater is not released in the circumferential direction, and the heating efficiency at the time of boiling water and the heat retention efficiency at heat retention are improved.

  Moreover, the outer cylinder bottom part heated by the heating control of the heater continues to the side surface while maintaining a long distance, and is radiated in the meantime and exposed to the side surface side after the temperature is lowered.

  Therefore, it is safe even when the outer cylinder side of the liquid container forms the outer shell of the electric kettle body.

(5) Invention of Claim 5 The electric kettle of this invention is the structure of the invention of the said Claim 3, The predetermined connection member is a handle member, It is characterized by the above-mentioned.

  If comprised in this way, since the handle member itself required originally functions effectively as a connection member of a shoulder member, a bottom member, and a liquid container, it becomes unnecessary to employ | adopt a special connection structure.

  As a result, according to the present invention, it is possible to provide an electric kettle that has high design novelty, is light and simple, has no fear of burns, and has high safety and heat retention.

  In addition, the remaining amount of hot water at the time of pouring can be reduced.

It is the up-down direction sectional view of the center part seen from the side which shows the whole structure of the electric kettle which concerns on Embodiment 1 of this invention. It is sectional drawing of the up-down direction of the center part seen from the front which differs from FIG. 1 which shows the whole structure of the same electric kettle. It is sectional drawing of the electric kettle which concerns on the said Embodiment 1 which shows the subject of Embodiment 2 of this invention. It is sectional drawing of the up-down direction of the center part seen from the side which shows the structure of the electric kettle which concerns on Embodiment 2 of this invention which solved the subject of the said FIG. It is the up-down direction sectional view of the center part seen from the side which shows the whole structure of the electric kettle which concerns on Embodiment 3 of this invention. It is the up-down direction sectional view of the center part seen from the side which shows the whole structure of the electric kettle which concerns on the modification of Embodiment 3 of this invention. It is the up-down direction sectional view of the center part seen from the side which shows the structure of the liquid container of the electric kettle which concerns on Embodiment 4 of this invention. It is an up-down direction sectional view of the center part seen from the side which shows the structure of the liquid container of the electric kettle concerning Embodiment 5 of this invention.

<Embodiment 1>
Hereinafter, the configuration of the first embodiment of the electric kettle of the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 shows the overall internal configuration of the electric kettle body according to the first embodiment of the present invention, and FIG. 2 shows an electric kettle at a cut surface that is different from the position shown in FIG. The overall internal structure of is shown.

(Configuration of electric kettle body)
That is, the electric kettle of this embodiment includes, for example, as shown in FIGS. 1 and 2, a container body 1A for hot water storage, a lid body 2 that opens and closes an upper side opening of the container body 1A, and the container body. With respect to the hot water heater 4 which is a heating means for heating the liquid container 3 part of 1A, when the hot water in the liquid container 3 is heated, a hot water outlet 5 for supplying hot water in the liquid container 3 to the outside, and the back of the container main body 1A And a handle member 60 attached so as to extend from the upper end side to the lower end side.

  In the case of this embodiment, the container main body 1A is a bottomed cylindrical body that forms an inner container portion of the liquid container 3, and a first cylindrical body 3a made of stainless steel having an open top, and the first The upper and lower end edges are formed in the form of a first vacuum heat insulation space 3c having a predetermined height in the vertical direction between the outer periphery of the first cylinder 3a and the outer peripheral surface of the first cylinder 3a. A stainless steel second cylindrical body 3b that forms a vacuum double-walled liquid container 3 together with the first cylindrical body 3a by joining the upper and lower ends of the first cylindrical body 3a; A shoulder member 11 made of synthetic resin with a sleeve structure fitted to the upper edge opening edge 34 and the shoulder outer peripheral portion of the liquid container 3 composed of the first and second cylindrical bodies 3a and 3b, and the lower surface side of the liquid container 3 From the bottom member 1B of the tray structure fitted to the outer peripheral side predetermined height position b so as to cover the bottom heater 4 You have me.

  The bottom 31 of the first cylindrical body 3a is flat, and the main portion of the side 32 is formed in a cylindrical body having a substantially equal diameter in the vertical direction, while its upper end opening edge is radially inward. After the diameter is increased again through the reduced diameter portion 36 having a V-shaped cross section whose diameter is greatly reduced, the diameter is extended straight above a predetermined height.

  The second cylindrical body 3b has a side portion 35 of substantially the same diameter from the upper end side shoulder portion to the lower end portion, and the upper end side opening edge portion is bent in a hook shape by a predetermined width a radially inwardly. After the shoulder portion is formed, the upper portion extends straight upward at a predetermined height, and the upper end side straight edge portion of the upper end side opening edge portion of the first cylindrical body 3a (from the upper end side of the reduced diameter portion 36 upward). The lower end side edge 35a is joined to and integrated with a straight portion having a predetermined length straight, and the lower end side edge 35a is lower than the bottom 31 surface of the first cylindrical body 3a by a predetermined dimension C (specifically, the heater 4). The bottom side of the bottom portion 31 of the first cylindrical body 3a has a predetermined vertical height c and a horizontal width W below the outer peripheral surface portion of the bottom portion 31 of the first cylindrical body 3a. After being bent in a U shape radially inward so as to form the vacuum heat insulating space 3d, its tip It is joined to the inside of the outer peripheral surface of the bottom 31 of the first cylindrical body 3a (near the outer peripheral part of the heater 4), and the above-mentioned first on the side part side between the outer peripheral part of the bottom 31 of the first cylindrical body 3a. The bottom side second vacuum heat insulation space 3d that is continuous with the vacuum heat insulation space 3c is formed.

  The second cylindrical body 3b is formed with a stepped portion 35b having a bowl-like cross section over the entire circumference in a shape that is concave on the inner peripheral surface side at the upper end side shoulder portion, and the shoulder member 11 of the shoulder member 11 is formed there. A cylindrical outer peripheral frame 11b portion is fitted and fixed.

  Further, the shoulder member 11 has a cylindrical inner peripheral frame 11c at a position close to the inner side in the radial direction by a dimension (distance) corresponding to the shoulder width a on the upper surface side of the shoulder portion of the outer cylinder 3b. A fitting groove 12b for fitting the opening edge 34 of the liquid container 3 is provided in the center of the inner peripheral frame 11c from below to above.

  And the inner peripheral frame 11c part is fitted by the opening edge part 34 part of the said liquid container 3 using the same insertion groove | channel 12b.

  As a result, a heat insulating heat retaining space 37 is formed between the outer peripheral frame 11b and the upper surface of the shoulder portion of the second cylindrical body 3b so that outside air does not enter (highly sealable). Thus, the opening edge portion 34 of the liquid container 3 having relatively poor heat insulation is surrounded to improve heat insulation and heat retention.

  The liquid container 3 of the container main body 1A thus formed is positioned on the lower surface side of the bottom 31 of the first cylindrical body 3a forming the inner container portion and extends in the circumferential direction. A flat C-shaped water heater 4 is attached, and a bottom member fitting formed on the outer peripheral surface of the lower portion of the second cylindrical body 3b so as to cover the lower portion of the heater 4 and the second cylindrical body 3b. The side wall portion 40b of the bottom member 1B made of synthetic resin having the tray structure is integrally fitted using the step portion 35c having the vertical width b.

  Thus, the first cylindrical body 3a of the second cylindrical body 3b in which the dish-shaped main body portion 40a portion of the bottom member 1B covers the heater 4 portion and the side wall portion 40b portion is the outer cylinder of the liquid container 3. The portion (up to the position of height b) where the temperature is increased by the heat transmitted from is covered (details will be described later).

  The water heater 4 is installed on the lower surface of the bottom 31 of the first cylindrical body 3a, for example, on the outer periphery of a flat metal plate (heater plate) 4a made of aluminum or the like having good heat conductivity. A flat C-shaped heater embedding convex portion 4b having a predetermined height is provided on the side, and the heater is embedded in the flat C-shape so as to be embedded in the heater embedding convex portion 4b. Power supply lead terminals for connecting power supply lead wires, which are power supply wirings, are provided on both end sides so as to protrude from both ends of the heater embedding convex portion 4b (details are shown in the figure). Omitted).

  On the other hand, on the lower surface side of the heater plate 4a, for example, located on the inner peripheral side of the heater embedding convex portion 4b, a safety bimetal for detecting airing and a power supply circuit for the heater 4 are provided. A cylindrical power receiving coupler 10 having a sleeve-shaped guide cylinder 10 a provided with a power supply substrate Y, a power receiving rod-shaped electrode, a sleeve-shaped electrode, and the like is provided.

  And the above-mentioned bottom member 1B is fitted and integrated to the predetermined height position b of the lower outer periphery of the 2nd cylinder 3b as mentioned above in the form which covers them from the lower side, A circular opening 17a for inserting the power supply base 20 side power supply plastic 30 corresponding to the power receiving coupler 10 is provided at the center.

  On the other hand, the upper end side opening edge part (joint part of the upper end side opening edge part of the 1st, 2nd cylinders 3a and 3b) 34 of the liquid container 3 and the upper end side shoulder part of the 2nd cylinder 3b are mentioned above. Thus, the inner peripheral frame 11c and the outer peripheral frame 11b of the sleeve-shaped shoulder member 11 made of synthetic resin are fitted and fixed.

  That is, as described above, the shoulder member 11 includes a lower mouth portion (lower half portion of the hot water pouring outlet 5) 11a protruding toward the front end side, and an outer peripheral frame for fitting the sleeve-like lid body 2 over the entire circumferential direction. 11b and an inner peripheral frame 11c which is inside the outer peripheral frame 11b and is fitted to the opening edge 34 of the liquid container 3. And with respect to the rear end side handle attaching base portion 11d of the outer peripheral frame 11b and the rear end portion of the bottom member 1B, a predetermined width cross-sectional U-shape in a horizontal direction from the handle attaching base portion 11d portion of the rear end of the outer peripheral frame 11b. A connecting member 60a for attaching a handle made of synthetic resin that extends straight down to the rear outer peripheral edge of the bottom member 1B on the lower side, and extends rearward from the upper end portion of the connecting member 60a by a predetermined dimension. The handle member 60 is made of a synthetic resin that is bent in a U-shape in a side view from the part and is continuous with the connecting member 60a on the lower end side.

  The sleeve-shaped inner peripheral frame 11c portion has an insertion groove 12b having a predetermined depth into which the upper end opening edge 34 of the liquid container 3 is inserted, as described above, in the middle of the lower end side end extending in the circumferential direction. In addition, a sleeve-like outer peripheral frame 11b is provided on the outer peripheral side of the predetermined dimension so as to extend longer than the inner peripheral frame 11c by a predetermined dimension.

  And this outer peripheral frame 11b part is fitted by the level | step-difference part 35b part of the 2nd cylinder 3b upper end side shoulder part as mentioned above.

  The handle mounting base 11d and the handle member 60 extending in a bowl shape downward from the handle mounting base 11d are formed into a hollow cylindrical body as a whole, and are formed in a space b in the bottom member 1B. A wiring space a that communicates is provided, and an operation switch (power switch) 7 that is pivotally supported by a support shaft 7a is provided on the upper end side of the bent portion on the lower side. Further, a power supply board 15 is provided in the wiring space a as necessary.

  Further, the above-mentioned handle mounting connecting member 60a extending straight downward from the rear end of the outer peripheral frame 11b and the handle mounting base portion 11d is provided on both sides of the box section having a U-shaped horizontal section. A synthetic resin back cover having a predetermined width is provided in the circumferential direction extending in an arc along the outer peripheral surface of the 1A second cylinder 3b (not shown). The box part and the back cover are connected and integrated with each other by connecting the shoulder member 11 and the bottom member 1B to each other by engaging the lower end side with the inside of the outer peripheral edge of the bottom member 1B. Between them, the liquid container 3 having the vacuum double wall structure is held in a reliable and stable manner, and a container body 1A is formed which can be freely poured with the handle member 60.

  A steam discharge duct 21h that extends straight in the vertical direction is provided in the box portion of the handle attachment connecting member 60a.

  The upper end of the steam discharge duct 21h is connected to the duct connection port 21g of the steam introduction space 21f below the handle mounting base 11d, and the lower end 21i is the lower surface of the handle mounting connecting member 60a. The steam and the dew condensation water discharge port 21j are associated with each other.

  On the other hand, on the rear end side of the lid body 2 to be described later, the steam is divided into the boiling detection steam introduction space 21f provided with a bimetal-type boiling detection sensor 50 below the handle mounting base 11d of the handle member 60. Steam diversion passages 21d and 21e are provided downward from the back side.

  Then, the boiling of hot water in the liquid container 3 is performed by the operation of the bimetal portion of the boiling detection sensor 50 provided, for example, on the upper wall surface side 21f of the upper steam introduction space 21f of the coupling member 60a for attaching the handle member 60 (corresponding to it). The discharge of the generated steam) is detected, and the supply of power to the water heater 4 is shut off.

  On the other hand, when steam is introduced into the steam introduction space 21f for detecting boiling in this way, it is necessary to discharge the steam introduced into the same portion to the outside, and also generate dew condensation water at the portion. Therefore, it is necessary to discharge this to the outside.

  Therefore, inside the container main body 1A-side handle attachment connecting member 60a of the handle member 60 described above, as shown in FIG. 1, the steam and dew condensation water discharge port at the lower end of the handle attachment portion 60a from the bottom of the steam introduction space 21f. A steam discharge duct 21a as described above reaching 21j is provided, and the steam and the generated dew condensation water pass through the steam discharge passage in the steam discharge duct 21h. It is discharged from the steam outlet 21j on the side.

(Structure of the lid)
Next, the lid body 2 includes a synthetic resin upper plate 2a, a synthetic resin lower plate 2b having an outer peripheral edge coupled to the upper plate 2a, and an inner cover 2c below the synthetic resin lower plate 2b. The member 11 is detachably fitted to the inner opening of the inner peripheral frame 11c of the member 11 in the vertical direction.

  The space between the upper plate 2a and the lower plate 2b is formed in a heat insulating structure filled with a heat insulating material as needed, and a portion of the lower plate 2b has steam recessed downward from above. A pipe storage is provided. The steam pipes stored and installed in the storage section have steam discharge passages 21b to 21c that communicate with each other in a zigzag structure from the steam inlet port 21a of the lower inner cover 2c toward the upper steam outlet port 21d. Is formed. And the fall stop water valve 22 is installed in the steam inlet 21a below the steam discharge passages 21b to 21c.

  Reference numeral 18 denotes a mechanical lock / unlock switch that locks / unlocks the hot water pouring state. The lock / unlock switch 18 is located on the lower side against the repulsive force of the urging spring 18b. The valve body member 18a is pushed downward by a predetermined stroke to open the hot water pouring passage 5a between the lid body 2 side and the hot water pouring outlet 5 side of the container main body 1A. The hot water in the cylindrical body 3a can be poured out.

  Reference numeral 41 denotes a left and right operation plate for opening and closing the lid on the upper surface side of the lid body, and 43 denotes a finger insertion groove. Reference numeral 42 denotes a return spring in the left-right direction of the operation plates 41, 41.

(Configuration of power supply stand)
On the other hand, reference numeral 20 denotes the above-described table-type power supply stand, and the power supply coupler of the same sleeve structure fitted in the power receiving coupler 10 of the sleeve structure on the container body 1A side at the center of the cover body 20c. 30 is provided so as to protrude from the lower side to the upper side through the fitting port 17b at a predetermined height, and a winding storage part 20a for the AC power cord 20b is provided on the back side of the cover part main body 20c.

  The power receiving side end of the stored AC power cord 20b is connected to the base X portion of the power feeding coupler 30.

  The power supply coupler 30 corresponds to the sleeve-shaped guide cylinder 10a of the power receiving coupler 10 on the bottom member 1B side described above, and a guide cylinder 30a slidably fitted to the inside thereof, and an inner peripheral side of the guide cylinder 30a A sleeve-like electrode that is fitted and brought into contact with the inside of the sleeve-like electrode of the power receiving coupler 10 via a brush structure electrode, and a rod-like electrode on the power receiving coupler 10 side that is inside the sleeve-like electrode. It is composed of a cylindrical electrode to be inserted (details are omitted), and when the AC power cord 20b of the power cord storage portion 20a is connected to an AC power source, the power supply base 20 side power supply coupler 30 is used to AC power is supplied to the power receiving coupler 10 on the container body 1 </ b> A side, and further, power is supplied to the power circuit of the above-described bottom member 1 </ b> B side power supply substrate Y via the power receiving coupler 10.

  As a result, power is further supplied to the operation switch 7 on the handle member 60 side, the bimetal 50 for detecting boiling, the necessary power supply board 15 and the like via the power supply circuit.

  As described above, in the configuration of the embodiment of the invention of this application, the water container main body 1A including the liquid container 3 and the water heater 4 which is the heating means of the liquid container 3, and the container main body 1A are detachable. In the electric kettle comprising the power supply base 20 that supplies power to the water heater 4 that is the heating means of the liquid container 3 in the mounted state, the liquid container 3 is a first cylinder that is an inner cylinder. It consists of a container with a vacuum double wall structure of a cylindrical body 3a and a second cylindrical body 3b which is an outer cylinder, and the outer cylindrical side second cylindrical body 3b of the liquid container 3 is the container main body 1A of the electric kettle. The outer shell portion is formed, and the bottom member 1B portion that covers the bottom portion of the liquid container 3 is configured to be fitted so as to cover from the bottom portion of the liquid container 3 to a predetermined height position of the side surface portion. ing.

  According to such a configuration, the liquid container 3 portion becomes a vacuum heat insulating container having a vacuum double wall structure, and the heat retaining performance is improved. In addition, since the amount of heat released during boiling is reduced, the boiling efficiency is improved and the energy saving performance is enhanced.

  In this case, the bottom portion of the second cylinder 3b, which is an outer cylinder, is the above-described predetermined width portion of the outer peripheral portion of the bottom 31 of the first cylinder 3a, which is an inner container (inner cylinder) for boiling water. As shown in the figure, it is bent into a U-shaped cross section so as to be surrounded by a bottom-side vacuum heat insulating space 3d having a predetermined vertical height C and a predetermined radial width W, and is integrally joined to the bottom surface of the bottom 31 of the first cylindrical body 3a. Has been.

  Therefore, since the bottom part side vacuum heat insulation space 3d is covered to the bottom part 31 predetermined width part of the 1st cylinder 3a which is an inner container, the heat retention (heat insulation) becomes higher.

  Further, in the same configuration, as described above, the vacuum heat insulating space 3d at the lower end of the second cylindrical body 3b extends downward and lower than the heater 4, and surrounds the outer periphery of the heater 4. The heat of the metal plate 4a is prevented from escaping in the circumferential direction, and the heating efficiency and the heat retention efficiency during boiling are improved.

  Moreover, in the case of the above structure, in the opening edge part 34 part of the said liquid container 3, the heat from the 1st cylinder 3a side which is an inner container (inner cylinder) for boiling water is the 1st, 2nd cylinder. 3a, 3b is transmitted to the second cylindrical body 3b side through the mutual opening edge joint portion of the 3a, 3b, the temperature at the outer peripheral surface of the shoulder portion on the upper end side of the second cylindrical body 3b is moderate, and feels hot when touched. become.

  Therefore, in the above configuration, the upper end opening of the first cylinder 3a is greatly reduced in diameter in the radial direction to exert a heat keeping action, and the distance to the joint with the second cylinder 3b is increased. Increase the temperature to lower the temperature up to the junction of the second cylinder 3b. In addition, the upper end side shoulder of the second cylinder 3b is bent radially inward to increase the shoulder width a of the second cylinder 3b, and the distance to the outer peripheral surface side is increased. The upper end of the second cylinder 3b is exposed to the outside after increasing the distance to the outer peripheral surface and lowering the temperature as effectively as possible. The exposed portion is further covered with a portion of the outer peripheral frame 12b of the shoulder member 11 down to a predetermined position so as not to be touched directly so as not to feel heat.

  The same applies to the bottom side of the liquid container 3, and the lower end side edge 35 a of the second cylinder 3 b is a position of a dimension c below the bottom surface of the bottom 31 of the first cylinder 3 a and the heater 4. And is further bent upward in the radial direction by a predetermined dimension W, and then again extended upward and joined to the bottom surface of the bottom 31 of the first cylindrical body 3a. In addition, an effective heat insulating space 3d is formed, and the distance from the joint portion with the first cylinder 3a to the outer peripheral surface of the side portion 35 of the second cylinder 3b is sufficiently long.

  Therefore, on the lower end side of the side portion 35 of the second cylindrical body 3b, the temperature is considerably reduced. And on that, the outer periphery of the side wall part 40b of the said bottom member 1B is an inner container (inner cylinder) with respect to the lower end part of the said 2nd cylinder 3b which forms the said bottom part side vacuum heat insulation space 3d. The outer periphery of the side wall portion 35 of the second cylindrical body 3b is covered up to a sufficiently high position b where the temperature of the heat transmitted from a certain first cylindrical body 3a is lowered to the sufficiently safe temperature level. So, even if you touch it directly, it doesn't feel hot.

  Therefore, it becomes safer.

(Embodiment 2)
Next, FIG. 4 has shown the structure of the electric kettle which concerns on Embodiment 2 of this invention.

  In the configuration of this embodiment, an electric kettle provided with a liquid container 3 having a vacuum double wall structure comprising the inner cylinder and the outer cylinder of the first embodiment and a large reduced diameter portion 36 for heat keeping inside the opening. In the above, the opening itself is displaced to the hot water pouring outlet 5 side so that the reduced diameter width of the reduced diameter portion 36 becomes smaller on the hot water pouring outlet 5 side.

  As in the first embodiment, the reduced diameter portion 36 having a V-shaped cross section that reduces the opening diameter is provided on the first cylindrical body 3a that is the inner cylinder of the liquid container 3 having a vacuum double wall structure. If it is formed with a uniform dimension over the whole area, the opening area of the container opening is reduced, and the heat insulation and heat retention of the vacuum double wall structure are further improved.

  However, in such a configuration, for example, as is apparent from FIG. 3, when the container body 3 is tilted forward and poured out toward the hot water outlet 5, the final hot water is not poured out. However, there is a problem that a certain amount of remaining hot water is generated due to the presence of the reduced diameter portion 36. The amount of remaining hot water increases as the diameter reduction size increases.

  Therefore, if the diameter reduction size is reduced as a whole, the remaining amount of hot water is reduced, but if it is so, the heat insulating property and the heat retaining property are lowered.

  Therefore, in this embodiment, in order to solve the problem, for example, as shown in FIG. 4, the reduced diameter of the reduced diameter portion 36 is not equal to the entire circumferential direction. The opening edge 34 of the liquid container 3 itself is displaced to the hot water pouring outlet 5 side with the same opening diameter so as to become smaller only on the hot water pouring outlet 5 side (so that Rb <Ra) (horizontal movement). ) (By making R2> R1), the reduced diameter Rb of the reduced diameter portion 36 on the hot water pouring outlet 5 side is made smaller than the reduced diameter Ra on the non-hot water pouring outlet side, By greatly expanding the angle between the straight wall portion 36A of the side portion 32 of the first cylindrical body 3a and the narrow wall portion 36A between the reduced diameter portion 36, The remaining amount is reduced (the dot display portion in FIGS. 3 and 4 is compared).

(Embodiment 3)
5 and 6 show the configuration of the electric kettle according to the third embodiment of the present invention.

  In the configuration of this embodiment, the power supply board is located in the box of the outer peripheral side handle attachment connecting member 60a of the handle 60 side double wall portion of the liquid container 3 having the vacuum double wall structure in the first embodiment. 15 is arranged.

  According to such a configuration, the power supply substrate 15 can be effectively installed without considering the influence of heat from the inner container side, so that the installation in the narrow handle member 60 as in the prior art is possible. Compared to the above, it is easy to install the power supply board unit, and it is possible to increase the mounting amount of the electrical components on the board and to achieve high functionality.

  Further, since the connection distance between the power supply board terminal on the bottom member 1B side and the boiling detection temperature sensor 50 is close as viewed from the installation position and is in the middle in the vertical direction thereof, the wiring can be easily routed.

  As a result, the structure on the side of the handle member 60 can also be simplified, and it is not always necessary to have a vertical connection structure (a U-shaped structure) as shown in FIG. 5. For example, as shown in FIG. A grip structure in which a lower side that is not connected to the lower end of the member 60a is opened can also be used. Also in that case, the shoulder member 11 and the bottom member 1B are securely connected by the handle attachment connecting member 60a having the above-mentioned box structure, so that no problem in strength occurs.

  Therefore, the degree of freedom in design is increased and the operability is improved. Of course, material costs are also reduced.

(Modification)
Furthermore, when the power supply substrate 15 is arranged between the handle member 60 side handle mounting connecting member 60a and the side wall of the liquid container 3 as described above, for example, the opening of the liquid container 3 having high heat conductivity from the hot water. When a temperature sensor such as a thermistor is provided on the outer peripheral surface of the edge portion 34 to detect boiling, a microcomputer is provided on the power supply board 15 to control boiling water. As shown in FIGS. The boiling detection sensor 50, the steam diversion / introduction passages 21d to 21f, the discharge duct 21h for steam, and the like are not necessary, and a considerable simplification of the structure can be achieved.

(Embodiment 4)
Next, FIG. 7 has shown the structure of the electric kettle which concerns on Embodiment 4 of this invention.

  Even in the configuration of this embodiment, the liquid container 3 is a vacuum double container composed of the inner first cylindrical body 3a and the outer second cylindrical body 3b as described above, but the liquid container 3 has only a side portion. Is a vacuum double wall, and the bottom part on the first cylindrical body 3a side serving as an inner container is formed of a bottom plate member 31A separate from the first cylindrical body 3a.

  The side vacuum double walls 3a and 3b and the bottom plate member 31A are joined and integrated by welding (TIG welding) over the entire circumference (this welded portion is indicated by a symbol M).

  Note that a heater 4 similar to that of each of the above-described embodiments is brazed to the lower surface side of the bottom plate member 31A via a pre-made aluminum metal plate 4a.

  Further, the vacuum double walls 3a and 3b on the side portions are preliminarily evacuated after the evacuation holes H for vacuuming are provided in the second cylindrical body 3b portion on the outer cylinder side in advance. It is formed by sealing. And this vacuum sealing part is made to be concealed on the side of the connecting member 60a for handle attachment of each embodiment described above (see FIG. 1).

  Therefore, the appearance on the appearance is improved.

  In this way, the inner container side first cylindrical body 3a and the bottom plate member 31A forming the bottom thereof are separated, and after the heater 4 and the like are brazed to the lower surface side of the bottom plate member 31A, this is used as a heater unit. When welding is performed by fitting into the bottom opening edge 33B of the vacuum double walls 3a and 3b, even if the brazing temperature of the heater 4 is a high temperature of 600 ° C. or higher, the operation is already completed. Therefore, unlike the case where the heater 4 is brazed later, the sealing function of the vacuum double walls 3a and 3b is not affected.

  That is, as in the first to fourth embodiments, the first cylindrical body 3a-side bottom 31 is formed not by a separate body but by the first cylindrical body 3a itself, and the bottom 31 of the same body is made of aluminum. When the heater 4 is brazed via the metal plate 4a, the bottom 31 of the first cylinder 3a becomes a high temperature of 600 ° C. or more when the heater is brazed, and the vacuum portion 3c between the vacuum double walls 3a and 3b is metalized. There is a possibility that gas may be generated or the getter may be reactivated to maintain an appropriate vacuum state.

  However, such a fear can be surely eliminated by using this embodiment.

(Embodiment 5)
Furthermore, FIG. 8 has shown the structure of the electric kettle which concerns on Embodiment 5 of this invention.

  In this embodiment, in the configuration of the fourth embodiment, the first cylindrical body 3a side bottom portion 31 is formed not by a separate body but by the first cylindrical body 3a itself.

  The heater 4 is brazed to the bottom 31 of the same body via an aluminum metal plate 4a. For this reason, as already described, at the time of heater brazing, the bottom 31 of the first cylinder 3a becomes a high temperature of 600 ° C. or more, and metal gas is generated in the vacuum part 3c between the vacuum double walls 3a and 3b If the getter is reactivated, the vacuum may not be maintained properly.

  Therefore, in this embodiment, as shown in the drawing, the getter G is disposed at the position of the container opening edge 33A as far as possible from the bottom 31 where the heater 4 is brazed. And it is made to pinch | interpose with the space layer of the outer side 2nd cylinder 3b and the inner side 1st cylinder 3a of the liquid container 3 upper part.

  Further, a high temperature activation type (for example, 850 ° C.) is adopted as the getter G so that reactivation does not occur as much as possible when the heater 4 is brazed.

  Then, the vacuum evacuation is performed from the gap A portion for joining the first cylindrical body 3a and the second cylindrical body 3b at the lower part of the liquid container 3, and finally brazed with nickel brazing set in that portion. To do.

  With such a configuration, even if the brazing temperature of the heater 4 is 600 ° C. or higher, the reactivation of the getter G does not occur, so that a high quality vacuum degree can be maintained.

  Further, when the same configuration is compared with the configuration of the fourth embodiment (FIG. 7) having the same problem, in the case of the fourth embodiment, the liquid container 3 portion is added to the first and second cylinders 3a and 3b. The bottom plate member 31A is formed of three members, and the number of joints increases, so that the sealing performance is likely to be a problem. In the case of the present embodiment, however, there are two joints as usual. In other words, it is only necessary to select a getter G having a high activation temperature and change the arrangement position thereof, so that it is cheaper and lower in cost.

  1A is a container body, 1B is a bottom member, 2 is a lid, 3 is a liquid container, 3a is a first cylinder, 3b is a second cylinder, 3c and 3d are vacuum insulation spaces, 4 is a heater, 20 is Power supply stand 31 is a bottom, 32 is a side, 34 is an opening edge, 35 is a side, 35a is a lower edge, 60 is a handle member, and 60a is a connecting member for handle attachment.

Claims (5)

  An electric kettle comprising a liquid container having a vacuum double wall structure composed of an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, and a bottom member covering the heater The electric kettle is characterized in that the outer cylinder side of the liquid container forms an outer shell portion of the electric kettle body, and the bottom member portion covers the bottom and side portions of the liquid container.   An electric kettle comprising a liquid container having a vacuum double wall structure composed of an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, and a bottom member covering the heater The electric kettle is characterized in that the opening of the liquid container is formed to be deviated toward the outer outlet side.   An electric kettle comprising a liquid container having a vacuum double wall structure composed of an inner cylinder and an outer cylinder, a heater at the bottom of the liquid container for heating the liquid container, and a bottom member covering the heater The liquid container has a shoulder member at its upper end opening, and the shoulder member and the bottom member are connected and integrated with each other by a predetermined connecting member.   The lower end of the outer cylinder of the liquid container is extended below the heater at the bottom of the liquid container and then joined to the bottom of the inner cylinder to form a vacuum heat insulating space on the lower outer periphery of the inner cylinder The electric kettle according to claim 1, 2 or 3.   The electric kettle according to claim 3, wherein the predetermined connecting member is a handle member.

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