JP2009136674A - Electric kettle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric kettle which can prevent defects such as melting of a resin made bottom body to reduce manufacturing cost and can keep the regulation for the insulation distance between contour resin parts and an electric connection part. <P>SOLUTION: The electric kettle 1 includes a cylindrical body 3, an inner vessel 2 stored in the body 3, an aluminum braising heater 7 arranged on the outside surface of the bottom of the inner vessel 2, and a resin made bottom body 5 attached to the lower end of the body 3. A heat shield plate 19 is provided between the aluminum braising heater 7 and the bottom body 5 so as to cover the lower part of the aluminum braising heater 7. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric kettle using an aluminum brazing heater.

  Generally, in an electric kettle, an aluminum brazing heater in which a sheathed heater is fixed to the bottom surface of an inner container by aluminum welding is used. There is only a resin bottom body below the aluminum brazing heater.

  In this electric kettle, the aluminum brazing heater does not detect emptying and abnormal heating causes the aluminum exceeding the melting point to become liquid and fall out of the heater, causing the resin bottom below the heater to melt, etc. was there.

  Therefore, it is conceivable to attach a heat shield to the main body. However, this requires a separate metal fitting for disposing the heat shield on the main body side, resulting in an increase in the number of parts and difficulty in assembly, resulting in an increase in manufacturing cost.

  The UL standard requires that an insulation distance between the outer resin component and the electrical connection portion be secured.

  The present invention has been made in view of the above-described conventional problems, can prevent defects, reduce manufacturing costs, and comply with regulations on the insulation distance between the outer resin component and the electrical connection portion. It is an object to provide an electric kettle that can be used.

As means for solving the above problems, an electric kettle according to the present invention comprises a cylindrical main body, an inner container accommodated in the main body, and an aluminum brazing heater disposed on the outer surface of the bottom of the inner container. In an electric kettle provided with a resin bottom attached to the lower end of the main body,
A heat shield plate is provided between the aluminum pressing heater and the bottom body so as to cover a lower portion of the aluminum pressing heater.

  By providing a heat shield plate between the aluminum pressing heater and the bottom so as to cover the lower part of the aluminum pressing heater, it is possible to receive the aluminum that melts and falls off the pressing heater. Accordingly, it is possible to prevent problems such as melting of the aluminum that is melted and dropped to the resin-made bottom body and melting the bottom body.

  In addition, the bottom body is shielded from the heat of the heater by the heat shield plate, and the resin bottom body is protected from the electrical connection portion of the heater.

  It is preferable that the heat shield plate is disposed at the bottom of the bottom body.

  By disposing the heat shield plate at the bottom of the bottom body, the number of parts is reduced as compared with the case where the heat shield plate is disposed on the main body side, and the assemblability is improved.

  It is preferable that the heat shield plate includes a plate formed so as to cover the aluminum brazing heater and an upright wall formed on a peripheral edge portion of the plate and extending upward.

  By forming the heat shield so as to cover the aluminum brazing heater, it is possible to reliably receive the aluminum that melts and falls off. Further, since the standing wall extends upward toward the peripheral edge of the plate, it can be received without overflowing aluminum that is melted and dropped.

The aluminum pressing heater has an electrical connection,
It is preferable that the heat shield plate is disposed at the bottom of the inner container.

The heat shield plate includes a plate formed so as to cover the aluminum pressing heater,
It is preferable to have a groove formed along the aluminum pressing heater.

  By forming the groove in the plate, it is possible to catch the aluminum that melts and drops from the body, which is the heating part of the aluminum pressing heater, without overflowing.

  It is preferable that the heat shield plate has a shielding portion that covers an electrical connection portion of the aluminum pressing heater.

  Since the shielding portion covers the electrical connection portion, the resin bottom body can be protected from the electrical connection portion of the aluminum pressing heater.

The main body is further provided on a connecting terminal that is disposed at the bottom of the inner container and is electrically connected to the aluminum pressing heater, and a conductor that electrically connects the aluminum pressing heater and the connecting terminal. With thermal fuse,
It is preferable that fuse holding means for holding the thermal fuse is provided on the heat shield plate.

  By providing the fuse holding means on the heat shield plate, the number of parts can be reduced and the manufacturing cost can be reduced as compared with the case where the heat shield plate and the fuse hold means are provided separately.

  As another means, it is preferable that the heat shield plate is made of a metal having a melting point higher than that of the aluminum welded portion of the aluminum brazing heater, such as iron or stainless steel.

  Since the heat shield plate is formed of a metal having a melting point higher than that of aluminum, the heat shield plate is prevented from being melted by receiving aluminum that is melted and dropped.

  According to the electric kettle of the present invention, the heat shield plate is disposed at the bottom of the bottom so as to face the aluminum brazing heater, so that the aluminum that is melted and dropped can be received. Accordingly, it is possible to prevent problems such as melting of the aluminum that is melted and dropped to the resin-made bottom body and melting the bottom body. Further, by arranging the heat shield plate at the bottom of the bottom body, the number of parts is reduced compared to the case where it is arranged on the main body side, and the assemblability is improved, so that the manufacturing cost is reduced. Furthermore, the bottom body is shielded from the heat of the heater by the heat shield, and the bottom made of resin is protected from the electrical connection part of the heater, and the regulation for the insulation distance between the outer resin part and the electrical connection part is observed. can do.

  By forming the heat shield so as to cover the aluminum brazing heater, it is possible to reliably receive the aluminum that melts and falls off. Further, since the standing wall extends upward to the peripheral edge portion of the plate, aluminum that melts and falls can be received without overflowing.

  By forming the heat shield plate with a metal having a melting point higher than that of aluminum, it is possible to prevent the heat shield plate from being melted by receiving aluminum that melts and falls off.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows an electric kettle 1 according to a first embodiment of the present invention. The electric kettle 1 includes an inner container 2 that stores liquid, a main body 3 that stores the inner container 2, a lid body 4 that opens and closes an upper end opening of the main body 3, a bottom body 5 that is attached to the lower end of the main body 3, A mounting table 6 that engages with the bottom body 5 is provided.

  On the bottom outer surface of the bottomed inner container 2, an aluminum brazing heater 7 for heating the inner container 2 and a mounting leg 9 screwed into the screw 8 inside the aluminum brazing heater 7 are disposed downward. Yes. As shown in FIG. 3, the aluminum brazing heater 7 is aluminum-welded to the bottom surface 11 of the stainless steel inner container 2 and arranged in an annular shape. At the end of the aluminum brazing heater 7, electrical connection portions 14 a and 14 b are formed, which are connected to the electrical connection terminals 12 that are supplied with electricity by engaging with the mounting table 6 via the conductive wires 13.

  The main body 3 includes a cylindrical body 15 and a handle portion 16 disposed at the rear of the body 15.

  The lid 4 is attached so as to be freely opened and closed around a hinge 17 provided on the rear end side. By opening the lid 4, liquid can be poured into the inner container 2. A spout 18 is formed in front of the lid 4 to discharge the liquid in the inner container 2.

  A metal heat shield plate 19 is disposed on the bottomed bottom body 5. As the material of the heat shield plate 19, a material having a higher melting point than aluminum, such as iron and stainless steel, can be used. As shown in FIG. 2, the heat shield plate 19 includes a hollow circular plate 21 and standing walls 22 a and 22 b formed so as to extend upward at the peripheral edge of the plate 21. As shown in FIG. 3, the plate 21 is formed to cover the entire aluminum brazing heater 7. The plate 21 can be provided with a convex engaged portion 24 in which a hole 23a through which the screw 8 is inserted is formed. The screw 8 is inserted through the hole 23 b of the bottom body 5 and the hole 23 a of the heat shield plate 19 and screwed with the mounting leg 9 at the bottom of the inner container 2, thereby narrowing the heat shield plate 19 between the mounting leg 9 and the bottom body 5. The heat shield 19 and the bottom body 5 are attached to the inner container 2 while being held.

  On the upper surface of the mounting table 6, an electric supply terminal 25 having a circular cross section is disposed upward. The electric supply terminal 25 is connected to an electric cord (not shown) inserted into an outlet (not shown), and supplies electricity to the aluminum brazing heater 7 through the electric connection terminal 12 at the bottom of the inner container 2.

  In the electric kettle 1 having the above configuration, when water is put into the inner container 2 of the main body 3 and placed on the mounting table 6 and the power is turned on, electricity is supplied from the mounting table 6 to the aluminum brazing heater 7, and the aluminum brazing heater 7 heats the water in the inner container 2. This shuts off electricity when the water boils. When electricity is supplied without water, or when electricity is supplied until the water is emptied due to a malfunction of the thermostat, the air is blown and the aluminum of the brazing heater 7 is melted. However, in the electric kettle 1, the heat shield plate 19 having the standing walls 22 a and 22 b and formed so as to cover the aluminum brazing heater 7 is disposed at the bottom of the bottom body 5. Even if the aluminum of the brazing heater 7 is melted, the aluminum that is melted and dropped can be reliably received without overflowing. Since the melting point of aluminum is 660 degrees, for example, the melting point of iron is 1500 degrees, the heat shield plate 19 will not melt even if the heat shield plate 19 receives aluminum that melts and falls off. Therefore, it is possible to prevent the aluminum that is melted and dropped from dropping into the resin bottom body 5.

  Moreover, since the heat shield 19 can be attached using the screw 8 and the attachment leg 9 for attaching the bottom body 5 by arranging the heat shield 19 at the bottom of the bottom body 5, it is arranged on the main body 3 side. Compared to the case, the number of parts is reduced and the assemblability is improved, so that the manufacturing cost is reduced. Further, the bottom body 5 can be shielded from the heat of the aluminum brazing heater 7 by the heat shield plate 19.

  By providing the heat shield 19, the resin bottom body 5 can be protected from the electrical connection portions 14 a and 14 b of the aluminum brazing heater 7, and the insulation distance between the outer resin component and the electrical connection portion can be reduced. You can comply with the regulations.

  By forming the engaged portion 24 in a convex shape, it is possible to reinforce the strength of the plate 21 and to prevent the aluminum that has melted and dropped out from leaking through the screw hole.

  FIG.4 and FIG.5 shows the modification of the electric kettle 1 of 1st Embodiment. In this example, the heat shield plate 19 has a shielding portion 32 at a position facing the electrical connection portions 14 a and 14 b of the aluminum pressing heater 7. The shielding portion 32 extends substantially vertically upward from the plate 21. Thereby, the regulation with respect to the insulation distance between the outer resin component and the electrical connection portion can be more reliably observed.

(Second Embodiment)
Although the electric kettle 1 of 2nd Embodiment is shown in FIGS. 6-8, the same code | symbol is attached | subjected to the element same as 1st Embodiment of FIG. 1, and description is abbreviate | omitted.
As shown in FIG. 7, the heat shield plate 19 includes a plate 21 formed in a disk shape covering the entire aluminum pressing heater 7. The plate 21 holds a groove portion 31 covering the body 7a of the aluminum pressing heater 7, a shielding portion 32 covering the electrical connection portions 14 (14a, 14b) of the aluminum pressing heat 7, and a temperature fuse 45 described later. A fuse holding portion (fuse holding means) 34 is provided.

  The plate 21 shields the bottom body 5 from the heat of the aluminum pressing heater 7. As shown in FIG. 8, a through hole 37 for inserting the electrical connection terminal 12 is provided near the center of the plate 21. In addition, three holes 23 a are formed in the periphery of the through-hole 37, and the screw 8 is screwed with the mounting leg 9 provided on the bottom surface of the inner container 2 through the hole 23 a, so that the heat shield plate 19 can be attached to the bottom of the inner container 2.

  The groove portion 31 is provided between the body 7a and the bottom body 5 of the aluminum pressing heater 7, and receives the aluminum that melts and falls off from the abnormally heated aluminum pressing 7. The groove portion 31 is formed in a C shape in plan view so as to face the body 7a of the aluminum pressing heater 7 vertically downward. As shown in FIG. 6, the groove 31 is recessed downward, and the groove width dimension L <b> 1 is larger than the orthogonal projection of the aluminum pressing heater 7.

  The shielding part 32 is provided between the electrical connection parts 14a, 14b and the bottom body 5, and protects the bottom body 5 from the electrical connection parts 14a, 14b. As shown in FIG. 8, the shielding portion 32 is disposed in front of the electric kettle 1 on the side opposite to the handle portion 16. A pair of slits 36 are provided from the outer peripheral edge of the plate 21 at the C-shaped end of the groove 31, and a shielding part 32 is provided between the slits 36. Moreover, the cross section of the shielding part 32 is V-shaped.

  The fuse holding portion 34 is disposed in the vicinity of the handle portion 16 of the plate 21 and inside the main body 3, and is a thermal fuse disposed on the conductive wire 13 that electrically connects the electrical connection terminal 12 and the aluminum pressing heater 7. 45 is held. As shown in FIGS. 10 and 11, the fuse holding portion 34 includes a drooping surface 41 that is continuous with the plate 21 and extends downward in the vertical direction, and a horizontal surface 42 that is continuous with the drooping surface 41 and extends in the horizontal direction outward in the radial direction. And a rising surface 43 that is continuous with the horizontal surface 42 and rises in the vertical direction, and an upper surface 44 that is continuous with the rising surface 43 and extends obliquely upward inward in the radial direction. As shown in FIG. 9, holding pieces 46 for holding the thermal fuse 45 are protruded from both side ends of the upper surface 44.

Next, assembly of the heat shield plate 19 of the second embodiment (electric kettle 1) of the present invention will be described.
When the heat shield 19 is attached to the lower part of the aluminum pressing heater 7, first, as shown in FIG. 10, the thermal fuse 45 is inserted between the horizontal surface 42, the rising surface 43, and the upper surface 44, and the elasticity of the holding piece 46. Use to hold. At this time, the thermal fuse 45 can be easily inserted by providing the deformation allowance A between the upper surface 44 and the plate 21.

  Next, a part of the upper surface 44 is brought into contact with the lower surface of the aluminum pressing heater 7. Subsequently, as shown in FIG. 11, the screw 8 is inserted into the hole 23 a of the plate 21 and screwed into the mounting leg 9 to fix the plate 21 to the mounting leg 9. At this time, the screw 8 is screwed against the elastic force caused by the contact between the aluminum pressing heater 7 and a part of the upper surface 44, and the plate starts from the contact point between the aluminum pressing heater 7 and a part of the upper surface 44. The upper surface 44 is moved by the deformation allowance A up to 21. Therefore, when the screw 8 is screwed into the mounting leg 9, the upper surface 44 is urged toward the aluminum pressing heater 7, and the upper surface 44 can be reliably pressed against the aluminum pressing heater 7.

  Furthermore, since the heat shield plate 19 includes the fuse holding portion 34, the number of parts can be reduced and the manufacturing cost can be reduced as compared with the case where the heat shield plate 19 and the fuse holding portion 34 are provided separately.

  In the electric kettle 1 having the above-described configuration, even when the power is turned on and electricity is supplied to the aluminum brazing heater 7, electricity is supplied in a state where water is not contained, or until the water is emptied due to a malfunction of the thermostat. If supplied, it will be in an empty state and the aluminum pressing heater 7 will be heated abnormally. However, by attaching the temperature fuse 45 and the fuse holding portion 34 to the lower side of the aluminum pressing heater 7, the upper surface 44 is pressed against the lower surface of the aluminum pressing heater 7, and the temperature fuse 45 is pressed via the upper surface 44 through the aluminum pressing. Abnormal heating of the heater 7 is reliably detected and the thermal fuse 45 is blown. Thereby, the conducting wire 13 is interrupted and electricity can be prevented from flowing.

  Further, the heat of the aluminum pressing heater 7 is transmitted from the upper surface 44 in the order of the rising surface 43, the horizontal surface 42, and the hanging surface 41, so that the heat of the aluminum pressing heater 7 does not escape to the plate 21 before being transmitted to the thermal fuse 45. Therefore, the temperature fuse 45 can effectively detect abnormal heating of the aluminum pressing heater 7.

  If electricity is continuously supplied to the abnormally heated aluminum pressing heater 7 due to a malfunction of the thermal fuse 45, the aluminum of the brazing heater 7 is melted. However, in this electric kettle 1, the heat shield plate 19 having the groove 31 is disposed between the aluminum pressing heater 7 and the bottom body 5, so that the aluminum of the aluminum brazing heater 7 is melted in the unlikely event of emptying. Even if it does, it can catch the aluminum which melts and falls without overflowing.

  Further, by providing the shielding portion 32, the resin bottom body 5 can be protected from the electrical connection portions 14a and 14b of the aluminum brazing heater 7, and the insulation distance between the outer resin component and the electrical connection portion can be protected. You can comply with the regulations.

  In addition, the electric kettle 1 is not limited to the said embodiment, A various deformation | transformation is possible.

  As for the electric kettle 1 of either the first embodiment or the second embodiment, as far as the plate 21 can be shielded from the heat of the aluminum pressing heater 7 with respect to the plate 21, the material and shape constituting the plate 21 Is not limited to that of the embodiment. For example, the plate 21 may be a quadrangle or polygon instead of a circle.

  Various modifications can be made to the heat shield 19 of the electric kettle 1 of the second embodiment.

  The shape of the groove 31 is not limited to the above-mentioned shape as long as the aluminum melted and dropped from the aluminum pressing heater 7 can be received without overflowing. For example, a configuration having a semicircular cross section protruding downward is also possible. Can be adopted.

  Regarding the shape of the shielding portion 32, the bottom 5 made of resin can be protected from the electrical connection portions 14a and 14b, and is not limited to the shape as long as it is flowable. obtain.

  The fuse holding portion 34 is not limited to the above shape as long as the temperature fuse 45 can be held and the heat of the aluminum pressing heater 7 can be reliably detected.

The partial cross section side view of the electric kettle by a 1st embodiment of the present invention. The disassembled perspective view of the electric kettle of FIG. The bottom view of the electric kettle of FIG. 1 which removed the bottom body. The perspective view which shows the modification of the heat shield of the electric kettle of FIG. The bottom view which attached the heat shield of FIG. 4 to the electric kettle of FIG. The partial expanded sectional view of the electric kettle by 2nd Embodiment of this invention. The disassembled perspective view of the electric kettle of FIG. The bottom view of the electric kettle of FIG. 6 which removed the bottom body. The partial expansion perspective view of the fuse holding means of the heat shield of FIG. The partial expanded sectional view before attaching the heat shield of FIG. 7 to the bottom part of an inner container. The partial expanded sectional view of the state which attached the heat shield of FIG. 7 to the bottom part of the inner container.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric kettle 2 Inner container 3 Main body 7 Aluminum brazing heater 19 Heat shield plate 21 Plate 22a, 22b Standing wall 31 Groove part 32 Shield part 34 Fuse holding part (fuse holding means)
41 Vertical surface 42 Horizontal surface 43 Rising surface 44 Upper surface 45 Thermal fuse 46 Holding piece

Claims (8)

A cylindrical main body, an inner container accommodated in the main body, an aluminum brazing heater disposed on the outer surface of the bottom of the inner container, and a resin bottom attached to the lower end of the main body In an electric kettle,
An electric kettle comprising a heat shield plate provided between the aluminum pressing heater and the bottom so as to cover a lower portion of the aluminum pressing heater.   The electric kettle according to claim 1, wherein the heat shield plate is disposed at a bottom portion of the bottom body. The heat shield plate is
A plate formed to cover the aluminum brazing heater;
A standing wall extending upward and formed on the peripheral edge of the plate;
The electric kettle according to claim 2, comprising: The aluminum pressing heater has an electrical connection,
The electric kettle according to claim 1, wherein the heat shield plate is disposed at a bottom portion of the inner container. The heat shield plate includes a plate formed so as to cover the aluminum pressing heater,
5. The electric kettle according to claim 4, further comprising a groove formed along the aluminum pressing heater.   6. The electric kettle according to claim 4, wherein the heat shield plate has a shielding portion that covers an electrical connection portion of the aluminum pressing heater. The main body is further provided on a connecting terminal that is disposed at the bottom of the inner container and is electrically connected to the aluminum pressing heater, and a conductor that electrically connects the aluminum pressing heater and the connecting terminal. With thermal fuse,
The electric kettle according to any one of claims 4 to 6, wherein fuse holding means for holding the thermal fuse is provided on the heat shield plate.   The electric kettle according to any one of claims 1 to 7, wherein the heat shield plate is made of a metal having a melting point higher than that of an aluminum welded portion of the aluminum brazing heater.

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