JP2841356B2 - Electric pot - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pot in which an electric heater is provided at a lower portion of the bottom of a liquid storage cylinder.

[0002]

Conventionally, this type of electric pot has a planar electric heater 4 in contact with a bottom surface 3 of a liquid storage cylinder 2 stored in an outer case 1 as shown in FIG. The electric heater 4 is pressed by a bottom member 6 having a leg 5 so as to contact the bottom surface 3. By operating the air pump 8 provided on the lid 7, the liquid stored in the cylindrical body 2 can be discharged from the discharge port 10 through the drain passage 9.

[0003] Such a conventional electric pot cylinder 2 is formed by rolling a strip-shaped metal plate and then welding the edge 2A thereof.
B and the disc-shaped bottom plate 2C were formed by welding. In the tubular body 2 formed by welding the tubular portion 2B and the bottom plate 2C to which the edge 2A is welded, since the tubular body 2 is formed of iron such as stainless steel, for example, the metallographic structure of the welded portion is formed. However, as a result, there is a problem that the welded portion is corroded and rust is generated on the cylindrical body 2.

Accordingly, the present invention solves the above-mentioned problems, and in an electric pot provided with a planar electric heater below the bottom surface of a cylinder for storing liquid, a cylinder which eliminates rust of the cylinder and has excellent thermal efficiency and strength. It is an object to provide an electric pot with a body.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a flange is provided at an opening edge.
The Nji portion is provided in an electric kettle provided with electrical heaters in a bottomed cylinder for liquid storage having a bottom surface at the bottom, the hula
The spinning process is performed on the cylindrical body in a state where the flange is pressed, so that the cylindrical part of the cylindrical body is formed thinner than the flange part.
It is an electric kettle, characterized in was because the tubular body is formed without using welding, eliminate rust, also cylindrical portion
Kill in improving the strength of the opening edge by was thickened flange portion thinner.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The cylindrical body 12 for storing liquid such as water stored in the outer case 11 is formed by processing a single stainless steel plate and forming a cylindrical portion 14 as a cylindrical portion on a circular bottom surface 13. A lid 16 provided with an air pump 15 is provided on the outer case 11 so as to be openable and closable, and by operating the air pump 15, water or the like stored in the cylindrical body 12 is drained. A discharge port of the lid 16 from a port 17 through a drainage path 18
It can be put out from 19.

Next, a method of manufacturing the cylindrical body 12 by spinning will be described with reference to FIGS. In the first manufacturing process shown in FIG. 2, a single stainless steel plate is pressed to form a bottom surface 13 and a short cylindrical portion 14A integrally to form a short cylindrical body 12A. Form.
The thickness T ₁ of the said bottom surface 13 by the press _working, the thickness T ₃ of thickness T ₂ and the flange portion 20 of the short cylindrical portion 14A is formed in almost the same. Next, in the second manufacturing process of FIG.
After the short cylindrical body 12A is set on the upper part of the molding die 21, by operating a start switch (not shown), the presser ring 22 is lowered by the elevation driving device 23, and a bearing (see FIG. The short cylindrical body 12A is fitted to the molding die 21 by the rotation ring 24 provided via a not shown) being engaged with the flange portion 20. After the fitting, the rotating shaft 21A integrally connected to the molding die 21 is rotated by a motor (not shown) or the like, and the short cylinder 12A rotates at a high speed together with the molding die 21. Next, in a third manufacturing process of FIG.
25 is pressed toward the short cylindrical portion 14A to thin the short cylindrical body 12A. The roll 25 on one side (right side in FIG. 4) is used for roughing, and the roll 25 on the other side (right side in FIG. 4) is for finishing. Then, by moving the roll 25 to the flange portion 20 side, the short cylindrical body 12A is stretched to form a thinner overall length (thickness t) as in the fourth manufacturing process of FIG. In the third manufacturing step and the fourth manufacturing step, the press ring 22 and, consequently, the flange portion 20 are pressed downward by the elevation drive device 23. The roll 25 is provided with an advance / retreat drive device 27 via an arm 26, and the advance / retreat drive device 27 is provided with an elevating drive device 28. The roll 25 is moved by the advance / retreat drive device 27 into a short cylindrical portion 14A. , And at the same time, it is lowered by the elevation drive device 28. After the short cylindrical body 12A is formed thinly to the flange portion 20 side by the roll 25 while rotating at a high speed in this way, the press ring 22 is retracted upward by the elevation drive device 23.
The roll 25 is retracted outward by the advance / retreat drive device 27, and is simultaneously retracted upward by the elevation drive device 28. Further, the mold 21 is provided with a brake device (not shown).
To stop. Next, as shown in the fifth manufacturing process of FIG.
And the take-off piece 29 is a lifting drive
By ascending by 29A, the cylindrical body 12 is
More extracted. The cylindrical body 12 thus processed
The thickness _{T 1} of the bottom surface 13 as shown in FIG. 7 is formed with a thickness greater than the thickness approximately 0.25mm of the cylindrical portion 14 as approximately approximately 0.6mm, also the thickness _T of the flange portion 20 ₃ is also about a substantially 0.6mm (T ₁ > t, T ₂₎
> T, T ₃ > t).

A planar electric heater provided on the bottom surface 13
30 is an upper heat transfer plate 31 made of a material having a higher thermal conductivity than the upper portion, for example, aluminum or an aluminum alloy, and an upper insulating plate 32 made of a material having a higher thermal conductivity as an electrical insulating material, for example, mica, A heater body 36 in which two types of heating wires 34 and heating wires 35 having different resistances are wound on an electrical insulating plate 33 made of a material having excellent thermal conductivity, for example, mica, and heat conductive by an electrical insulating material. A lower electric insulating plate 37 made of a material having excellent heat conductivity, for example, mica, and a lower heat transfer plate 38 made of a material having excellent heat conductivity, for example, aluminum or an aluminum alloy. 32, the heater body 36, the lower electric insulating plate 37, and the lower heat transfer plate 38 are disposed one on top of the other, and the bent pieces 39 provided on both sides of the upper heat transfer plate 31 are attached to the lower heat transfer plate 38. Bend to the bottom side of Is becoming A temperature sensor 40 is provided at the center of the upper heat transfer plate 31, the upper electric insulating plate 32, the electric insulating plate 33, the lower electric insulating plate 37, and the lower heat transfer plate 38 via the mounting projection 40A on the bottom surface 13. Holes 31A, 32A, 33A, 37A, 38A for attachment are formed. Reference numeral 41 denotes a lead wire for the heating wires 34 and 35, which is connected to a control device (not shown).

Reference numeral 42 denotes a disk portion serving as a bottom member for pressing the electric heater 30 against the bottom surface 13, and the disk portion 42 has a disk shape substantially the same shape as the bottom surface 13; mouth
A through-hole 43 of the drainage passage 18 is formed opposite to 17, and a concave portion 44 is formed so as to contact a bent piece portion 39 provided by bending the heater main body 36. . Further, a short cylindrical portion 45 is provided at an edge of the disk portion 42, which is a continuous portion provided continuously upward. The disk portion 42 and the short cylindrical portion 45 are made of a material having excellent thermal conductivity, for example, aluminum or an aluminum alloy, and are integrally formed by press working or the like. An electric heater 30 having the heater body 36 and the like integrated therewith is disposed on the bottom surface 13, and the disc portion 42 is vertically moved by a press portion 46 of a disc-shaped pneumatic or hydraulic device (not shown). The short cylindrical portion 45 is fitted to the cylindrical portion 14 by applying the pressure of arrow A). Next, in the figure radially disposed from the lateral side of the outer periphery of the short cylindrical portion 45 (arrow B), 6
Pneumatic or hydraulic device (not shown)
Simultaneously. The caulking jig 47 has a tip 47A that is sharply formed in the horizontal direction. By pressing the tip 47A, a caulking pressing portion 48 is formed in the short cylindrical portion 45 to cut into the cylindrical portion 14. The cylindrical portion 45 and, consequently, the disk portion 42 are fixed while pressing the electric heater 30 against the bottom surface 13. 48A is a small projection formed inside the cylindrical portion 14 by the caulking pressing portion 48. Therefore,
A part of the short cylindrical portion 45 is bitten into the cylindrical portion 14 by the caulking pressing portion 48 and plastically processed, and in a state where the electric heater 30 is pressed against the bottom surface 13, the cylindrical body 12 and the electric heater 30 are pressed. The short cylindrical portion 45 is assembled into the outer case 11. When electricity is supplied to one or both of the heating wires 34 and 35, the heating wires 34 and 35 generate heat, and the heat is generated by the upper electric insulating plate 32, the upper heat transfer plate 31, The bottom surface 13 is heated through the piece 39. At this time, since the bottom surface 13 is formed thick, the heat storage amount is large and the heat is transferred to the upper heat transfer plate.
Only the portion of the bottom surface 13 where the 31 abuts is not heated at a high temperature,
The entire bottom surface 13 is heated by heat conduction. Further, the heat passes through the lower electric insulating plate 37, the lower heat transfer plate 38, and the bent piece portion 39 to heat the bottom surface 13 to boil water (not shown) stored in the cylindrical body 12.

As described above, in the above embodiment, after the short cylinder 12A is formed from one stainless steel plate, the short cylinder 12A is formed by a tube-type spinning process.
By forming the cylindrical body 12, there is no deterioration of the material of the cylindrical body 12, and the occurrence of corrosion can be eliminated.

Further, the thickness T ₁ of the said bottom surface 13 of the cylindrical body 12 formed by spinning the tube type, by which is larger than the thickness t of the cylindrical portion 14, the bottom surface
In addition to improving the strength of 13, heat from the electric heater 30 can be conducted to the entire bottom surface 13, so that local heating can be eliminated and thermal efficiency can be improved. further,
The thickness T _{3 of the} flange portion 20 provided on the upper edge of the cylindrical body 12
Is larger than the thickness t of the cylindrical portion 14,
The strength of the opening edge of the cylindrical body 12 can be improved, and deformation or the like hardly occurs when the cylindrical body 12 is assembled into the outer case 11 or the like.

In addition, the lower portion of the electric heater 30 is pressed against the bottom surface 13 of the cylindrical body 12 so that the electric heater 30 is moved to the bottom surface.
Since the pressing portion 48 for caulking from the outer periphery of the cylindrical portion 14 of the cylindrical body 12 is continuously provided to the disk portion 42 in contact with the 13, the welding portion can be wiped out when the electric heater 30 is attached to the bottom surface 13, Therefore, it is possible to prevent the deterioration of the material of the cylindrical body 12 and the occurrence of rust and the like.

The present invention is not limited to the above embodiment, and various modifications are possible, for example, a short cylinder may be formed by drawing and spinning.

[0014]

According to the present invention , a flange portion is provided at an opening edge,
In an electric kettle provided with electrical heaters in a bottomed cylinder for liquid storage having a bottom surface at the bottom, to press the flange portion
Is subjected to spinning the tubular member in a state, the cylinder of the cylindrical body
An electric pot characterized in that a portion is formed thinner than the flange portion , and rust can be eliminated by forming a cylindrical body without using welding. Further, since the flange provided on the upper edge of the cylindrical body is formed thicker than the cylindrical portion, the strength of the opening edge can be improved.

[Brief description of the drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a first manufacturing step of the embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a second manufacturing step of the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a third manufacturing step of the example of the present invention.

FIG. 5 is a sectional view showing a fourth manufacturing step of the example of the present invention.

FIG. 6 is a sectional view showing a fifth manufacturing step of the embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a sixth manufacturing step of the example of the present invention.

FIG. 8 is an overall exploded perspective view showing an embodiment of the present invention.

FIG. 9 is an exploded perspective view of an electric heater according to an embodiment of the present invention.

FIG. 10 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 11 is a partially enlarged sectional view showing a conventional example.

[Explanation of symbols]

12 Cylindrical body 13 Bottom surface 14 Cylindrical part (cylindrical part) 20 Flange part 22 Pressing ring 30 Electric heater T ₁ T ₃ t Thickness

Claims (1)

(57) [Claims] 1. A flange portion is provided at an opening edge, and a bottom surface is provided at a lower portion.
In an electric kettle provided with electrical heaters in a bottomed cylinder for liquid storage provided with, cylinder while pressing the flange portion
The body is subjected to spinning, and the cylindrical portion of the cylindrical body is
An electric pot characterized by being formed to be thinner than a flange portion .