JPS61259478A - Heat generating body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating element for an electric heater for heating liquids such as water, milk, and alcoholic beverages in general households.

BACKGROUND OF THE INVENTION A conventional heating element of this type is, for example, disclosed in Japanese Utility Model Application No. 62-150.
As shown in Japanese Patent No. 833, the configuration was as shown in FIGS. 4 to 6. That is, the main heater 1 of the high heat generation part and the auxiliary heater 2 of the low heat generation part are integrated in a laminated state, and the specific structure of this is also that the electric heating fIJ4 is attached to the insulating plate 3.
is wrapped to form a high heat generation plate 5, and similarly, a low heat generation plate 6 is formed.
are formed independently, and the insulating plates 6 to 8 are interposed above and below each heat generating plate and laminated.Furthermore, a protective plate 9 and an outer shell plate 1o made of metal plates are overlaid on both sides of the entire heat generating plate, and this peripheral edge portion 1 is laminated.
1 are caulked together to form a heating element 12 having a disc-like or rectangular shape. In actual use, liquids and the like are heated by an indirect heating method in which the high heat generation part side is brought into contact with the surface to be heated. The conventional example shown in FIG. 4 is an example of an electric pot, and 13 is the pot body.

Problems to be Solved by the Invention With such a conventional configuration, in order to improve and guarantee the heating efficiency and the durability of the heating element as a whole, it is necessary to It was essential that design considerations were made to ensure that the laminated adhesion of the body components was as good as possible and to prevent the temperature of the heating wire itself from rising due to the generation of space thickness. For this reason, specific measures have been taken to: ■ improve the machining accuracy of component parts, prevent deformation and warping in their initial state, ■ improve the method of caulking the peripheral edge of the metal plate that incorporates the heat generating plate, and ■ improve the method of crimping the periphery of the metal plate that incorporates the heating plate, and and the need for countermeasures against hourly changes; ■Since it is an indirect heating method, it is possible to prevent a rise in line temperature compared to the direct heating method, resulting in a decrease in durability, and a decrease in heating efficiency; Prevents delays in heat conduction and decreases in efficiency due to heating, and since the high and low heat generating parts are stacked and integrated on the top and bottom of the heated surface, the height and height of the heat generating parts are mutually controlled. In order to prevent a temperature rise, especially on the side of a high heat generating part, due to heat generation synergy, it is necessary to set the power density CW/cd> of the heat generating element as large as possible within the allowable cost. issues such as these had to be addressed.

The present invention is intended to solve these problems, and aims to improve heating efficiency and extend durability.

Means for Solving the Problems In order to solve this problem, the present invention provides a heat generating plate in which an outer annular high heat generating portion and an inner annular low heat generating portion are formed on the same surface, and the outer annular high heat generating portion a heat diffusion plate with good thermal conductivity that is installed in close contact with the lower surface of the heating plate; a heat transfer member having an outer peripheral side edge that covers the upper surface of the heat generating plate; and an outer peripheral side edge that covers the lower surface of the heat diffusion plate. The heat transfer member and the back member are each provided with an upwardly protruding portion in the center to connect them to each other, and the heat generating plate is firmly clamped therebetween.

Effect: With this configuration, when the heating element is energized, heat from the upper surface of the high heat generating part is radiated from the heat transfer member, and heat from the lower surface is quickly conducted to the outer circumferential part via the heat diffusion member, and the heat from the lower surface of the low heat generating part is radiated through the heat transfer member. Heat from the auxiliary heating element is radiated upward from the heat transfer member. Because heat is quickly conducted through the heat transfer member, the wire temperature of the heating wire itself, especially on the side of the high heat generation part, is significantly lowered.
The durable life is extended and heating efficiency is increased due to the above-mentioned good conductivity.

Embodiments Hereinafter, embodiments of the present invention will be described based on the drawings.

First, a first embodiment shown in FIGS. 1 to 3 will be described. In the figure, 21 has a side edge 22 on the outer circumferential side and a plate-shaped heat transfer member with good heat conduction having an upward protrusion 23 in the center, and 24 has a side edge 26 on the outer circumferential side. It is a dish-shaped back member with good heat conduction, and has an upward protrusion 26 having a through hole 26a in the center.

Reference numeral 27a denotes a heat generating plate of a high heat generating section formed by wrapping a heating wire 29a around an outer annular insulating substrate 28a, and a heat generating disk 27b of a low heat generating section on the same plane and a heating wire 29a wrapped around an inner annular insulating substrate 28b. 29b is wound. This heating board 27a
, 27b, ring-shaped insulating plates 30a and 30b are laminated on top and bottom to form a heating plate 31. Further, a heat dissipating plate 32 having good thermal conductivity and having a through hole 32a in the center and an outer peripheral side portion 32b is a heat generating plate 27a of a high heat generating portion of the heat generating plate body 31.
It is located at the bottom and is closely attached. The heat diffusion plate 32 and the back surface member 24 located below the heat generating plate 2Tb portion of the low heat generating portion hold the covering diffuser plate 32 in a clamped and press-bonded state from the upper surface of the heat generating plate body 31.

The outer circumferential side portion 32b of the heat diffusion plate 32 is tightly attached to the outer circumferential side portion of the heat transfer member 21, and is made of a metal with good thermal conductivity such as aluminum, copper, brass, etc. 33 and 34 are lead wires for high and low heat generating parts.

In the above configuration, by passing a current through the heating wire 29a from the lead wire 33, the heating wire 29a is heated, the heat generating plate 27a of the high heat generating portion is heated, and the heat generating plate body 31 is heated. The heat generated at this time is transferred to the heat transfer member 21 and the heat diffusion plate 32.
is rapidly conducted, and the heat is radiated from the side edge 22 of the heat transfer member 21. That is, heat from the upper surface of the heat-generating plate 31 is radiated by the heat transfer member 21, and heat from the lower surface of the heat-generating plate 31 is quickly conducted toward the periphery of the heat transfer member 21 via the heat diffusion plate 32. Therefore, the wire temperature of the heating wire 29a itself is significantly lowered and the durable life of the heating wire 29a is extended.

At the same time, by passing current through the lead wire 34 and the heating wire 29b, the heating wire 29b is heated, the heat generating plate 27b of the low heat generation portion is heated, and the heat generating plate body 31 is heated. The heat generated at this time is quickly radiated to the upper surface of the heat transfer member 21.

In addition, the insulating substrates 28a, 28b and the insulating plates 30a, 3 due to the high temperature of the heat generating plates 2γa, 27b.
In case of thermal deformation 2 warping such as 0b, the heating plate 31 is the backing material 24. Since both sides are sandwiched between the heat diffusion plate 32 and the heat transfer member 21, this is prevented.

Furthermore, if the durability is set to the same level as before, it is possible to set the power density to a high density, which is especially noticeable on the high heat generation side, and the size of the heat generation element can be made compact in general. Is possible.

In addition, the inner annular low heat generating part is set in advance to the desired low power and is placed a certain distance from the high heat generating part side, so that even if electricity is started, the linear temperature will not rise toward the high heat generating part side. There is almost no cause for this, and as described in the conventional example, the mutual heat generation synergistic effect between the high heat generation part side and the low heat generation part side can be avoided.

Note that as the heat transfer member 21 and the back member 24, if an 18-8 stainless steel plate or a ferritic stainless steel plate containing 13-18% chromium and 0.5 to 2% molybdenum is used, joining becomes extremely easy.

In addition, regarding the power settings of low heat generation parts, the ratio of high and low heat generation parts, wire temperature settings, size, etc., the electric heating equipment to be adopted, structure 1
The selection should be made by comprehensively considering the machining accuracy of the parts, etc.

Effects of the Invention As is clear from the description of the embodiments above, according to the present invention, by sandwiching the heat generating plate between a heat transfer member with good heat conduction, a heat diffusion plate, and a back member, the heat generated by the heat generating plate can be reduced. The heat generated from the heat transfer member is effectively radiated to the heated object, and the heat generated from the bottom surface of the heating plate is radiated from the outer peripheral edge of the heat transfer member to the heated object through the heat diffusion plate and the back member. This prevents heat from accumulating in the heating element, lowers the temperature, and extends durability.

In addition, since the low heat generation part is arranged in an inner annular shape and is spaced a certain distance from the high heat generation part, it is possible to prevent mutual heat generation synergy between the high and low heat generation parts, effectively dissipating heat from the top surface of the heat transfer member, and making the heating element compact. It is something to do. As a result, when adopted in electric heating appliances such as water heaters, by combining predetermined electric circuits, both heating and heat retention functions are possible, and overall costs can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, Figure 1 is a sectional view, Figure 2 is a front view, Figure 3 is a cutaway plan view of the main part, and Figures 4 to 6 are conventional examples. FIG. 4 is a partially cutaway front view of the electric kettle, FIG. 6 is an exploded perspective view of the heating element, and FIG. 6 is an exploded perspective view of the heating element. , 23... protrusion,
24... Back member, 27a... Heat generating board, 27b... Heat generating board, 31... Heat generating board body, 32... Heat diffusion Board. fl-Ichiden Jukubu code 2Kame, 24-Ippatsu @Kame FJL---, 14 device 32-11 菬臲子褪 2nd figure f Figure 3 M 4 figure

Claims (1)

[Claims] A heat generating plate is formed by an outer annular high heat generating part and an inner annular low heat generating part, and a heat diffusion plate with good thermal conductivity is installed closely on the lower surface of the heat generating plate of the outer annular high heat generating part, and A heat transfer member having an outer circumferential side edge that covers the upper surface, and a back member having an outer circumferential side edge that covers the lower surface of the heat diffusion plate, and an upward protrusion at the center of each of the heat transfer member and the back member. A heating element formed by providing parts and connecting them to each other to sandwich the heating plate.