JPH0422092A - Device for surface-like heating element - 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 the Invention The present invention relates to a sheet heating element device used in electric pots and the like.

2. Description of the Related Art Conventionally, this type of heating element has been designed as shown in FIGS. 7 and 8.

That is, the heat generating board 10 has the central part of the bottom of the inner container 101 of the electric kettle protruding upward, and the main heat generating wire 103 and the auxiliary heat generating wire 104 are wound around a substrate 106 on the back surface of the heat transfer plate 102.
Insulating plates 107 and 108 are laminated and arranged above and below 6. This heating plate 106 (1 has a through hole in the center and has a heat diffusion plate 110 with good thermal conductivity and has 109 outer peripheral edges) and is embedded in the lower surface of the container bottom 101 in a crimped state by the backing material 11, A heating element portion is formed.

The terminal portions 103A and 104A of the main heat generating line 1o3 and the auxiliary heat generating line 104 are each attached line 103a.

1o4& was connected to the power supply section by stacking them on top of each other.

Problems to be Solved by the Invention However, in such a conventional configuration, since the area of the substrate 106 is limited, the winding pitch of the main heating wire 103 and the auxiliary heating wire 104 is inevitably reduced, making it difficult to wind the wire. Due to slack that sometimes occurs, the main heating wire 103 and the auxiliary heating wire 10
4 short-circuited, or if the winding pinch is increased to prevent short-circuiting, the main heating wire 103 and the auxiliary heating wire 1040
Not only does this increase the power density per unit area, causing major problems in terms of reliability and durability, but it is also not always desirable because the various parts that make up the electric kettle are affected by the temperature rise. In addition, especially the auxiliary heating wire 10 for small power
4, in order to meet the predetermined amount of power, a heating wire with a large resistance value, that is, a small cross-sectional area, is used, and the auxiliary heating wire 104 may break due to the tension during winding work, resulting in workability problems. There was a significant problem.

Furthermore, each end portion 103A, 104A of the main heating line 103 and the auxiliary heating line 104 is provided with a supplementary line 103a.

104a must be overlapped to suppress the heat generation in this part as much as possible before connecting it to the power supply section, resulting in problems such as poor workability such as wire processing.

Therefore, as a countermeasure to the above, a heating element was considered in which the main heating wire 103 and the auxiliary heating wire 104 were made up of heating plates made of foil-like resistance bands on both sides of the board 106, but the temperature increased due to the structure of the lead part of the heating plate. No method has yet been found that suppresses this problem and is both durable and workable.

The present invention solves the above-mentioned problems, and aims to provide a planar heating element device for heating a lead portion with low temperature rise, excellent durability, safety, and good workability.

In order to achieve the above object, the present invention provides a heating element in the form of a foil between each layer of a heat exchanger plate forming the bottom of the container and a plurality of insulating plates on the back side of the heat exchanger plate. A heating element part is provided, and the heating element part is provided with a heating element part extending from the foil-shaped light-thermal molding and folded so as to sandwich the notch part of the insulating plate below the foil-shaped heating element part. A U-shaped lead part is formed, and the tip part of this lead part ((joining surfaces of the abbreviated terminal plates are joined together, and the heating element part is connected to the seam plate through an insulating material covering this joining surface). It is configured to be fixed so as to be sandwiched between the hot plate and the hot plate.

Effects According to the above-described structure, the lead part extends from the foil-like heating element in a U-shape, and has an exposed part by extending from inside the insulation plate to the surface of the insulating plate that covers the heating element. When that part comes into contact with the outside air, the temperature rise is suppressed.

In addition, the joint surface of the terminal plate is covered with an insulating material, and the joint surface of the terminal plate along with the heating element is pressed against the heat transfer plate side by a seam plate, so the foil-shaped heating element near the lead part is always It is pressed through the insulating plate, and at the same time, the terminal plate can be independently erected.

EXAMPLE Hereinafter, one implementation of the present invention will be described with reference to FIGS. 1 to 4.

In □□□, 1 is a heat exchanger plate, the center part is made to project upward in an abbreviated shape to form a circumferential side edge 1a, and the outer edge of this circumferential side 1 edge 1a is connected to the lower end of the cylindrical body. A dimetallic liquid storage container 2 is formed by liquid-tightly fixing the liquid to the liquid by welding or the like.

On the lower surface of the heat transfer plate 1, there is a flat plate-like heat conductive plate 4 made of a good heat conductive material such as an aluminum plate 9 and a surface-treated steel plate.
A heating element section 6 is attached via the. This heating element part 6
An insulating material 7 made of mica or the like that covers the joint surface 6a of the oval-shaped terminal plate 6, and a heat-diffusing material 8 and an insulator 9 with good thermal conductivity such as an aluminum plate arranged on the lower surface of the insulating material 7, It is fixed to the bottom of the container 2 so as to press against the heat transfer plate 1 with a seam plate 10 made of aluminized steel or the like and having good thermal conductivity, which meshes with the inner wall of the edge 1a of the heat transfer plate 1.

The heating element portion 5 includes a first grip plate 11 made of mica or the like.
, a first foil-like output layer 14 and a second foil-like resistance band formed between each layer of the second insulating plate 12 and the third insulating plate 13.
The store-like barracks 15 are installed internally, and the first. Second foil heating element 1
A first lead portion 14a and a second glue-F portion 166 extend from both ends of 4.15.

The first lead portion 14a has a terminal plate 6 attached to the tip portion 14b.
The joint surface 6a of the second and third insulating plates 12.13 is fixed, and the middle thereof is bent into a substantially U-shape by the edge line 16a of the concave notch 16 provided on the outer periphery of the second and third insulating plates 12.13. (in the direction of the arrow in FIG. 3), the connecting portion 6b of the terminal plate 6 is erected downward.

The second lead part 15a has a terminal plate 6 similar to that described above only at one end, and the other end extends as the second lead part 15a to form a tip part 1tsb. and,
Both lead portions 16a are formed by folding the base line 16a of the cutout portion 16 of the third insulating plate 13 into a substantially U-shape as described above.

At this time, the terminal plate 6 provided on the second lead part 16a is arranged between both the first lead parts 14a, and the tip part 15b of the other end is connected to the tip part 1 of the first lead part 14a.
4b and are overlapped and connected to the terminal plate 6 (not shown).

The terminal plates 6 of the heating element section 5 thus formed are all based on the same surface of the third insulating plate 13, and their connecting portions 6b are erected. A fitting hole of the third insulating plate 13 passes through the connecting portion 6b, and a fitting hole of the insulator 9 having the collar 9a passes through the connecting portion 6b to electrically insulate it from the nearby metal live portion and to diffuse heat. By pressing the collar 9a penetrating through the plate 8 against the heat transfer plate IIJll+ by the elongated hole 10a of the seam plate 10, the terminal plate 6 is firmly fixed, and the terminal plate 6 is firmly fixed. The raised portions of the foil heating elements 14 and 16 are completely eliminated.

In the above configuration, when the connection portion 6b of the terminal plate 6 is energized, both the lead portions 14a.

A current flows through 15a to heat both the foil-shaped light-heating plates 14 and 15, and the electric kettle is ready for use. At this time, most of the self-heating amount of the portions where the foil heating elements 14.16 are sandwiched between the insulating plates 11, 12, and 13 is absorbed by the heat transfer plate 1, but both the leads Part 1
4a, 15aU, its own military temperature is the tip part 14b, 16
b to the connecting portion 6b via the joint surface 6a of the terminal plate 6.
is conducted to. This temperature increase in the connecting portion 6b is due to both lead portions 14a.

Both foil-shaped heating elements 14.15 near each insulating plate 11.15a.
This is likely to occur when the lead parts 12 and 13 are not sufficiently sandwiched, when the length l of both the lead parts 14a and 15a is long, and when the connection between the tip parts 14b and 15b and the joint surface 6a is insufficient.

However, according to this embodiment, both lead portions 14a.

16a is the first. Second insulating plate 11゜1
The third insulating plate 13 extends from the inside of the third insulating plate 13 and is formed in a U-shape with the longest length and has an exposed part. A cooling effect works when you touch it. As a result, the tip 14b
, 16b can suppress the temperature rise of the terminal plate 6 coupled to the terminal plate 6.

Further, when the seam plate 1o is attached to the bottom of the container 2, both the lead portions 14a are attached together with the heat generating portion of the valve body portion 5.

15 & nearby heat generating parts and tips 14b, 15b and joint surface 6
Since both a and a are reliably pressed, a temperature rise due to insufficient pressing of these two will not occur. Therefore, the temperature rise of the connecting portion 6b of the terminal plate 6 is suppressed, and durability and safety are further improved. Furthermore, the power supply lead is connected to the terminal plate 6 to both lead parts 14a and 15a of both foil-shaped heating elements 14 and 16, and bent into a U-shape to connect the terminal plate 6 to the connecting part 6b.
Since it is obtained by standing up the terminal plate 6, the workability is improved compared to the conventional method, and the terminal plate 6 can be firmly fixed.

In addition, both lead portions 14a of both foil-wrapped heating elements 14.15,
16ai Po 2nd. Notch 1 of third insulating plate 12.13
Although the middle part thereof is bent into a substantially U-shape by the edge line 16a of No. 6, both lead portions 14A, 1
The tip portions 14B and 16B of 6A are bent into an L shape in advance, and the second and third insulating plates 12A,
These L-shaped bent tip portions 14B are inserted into the approximately rectangular guide hole 17 provided in the guide hole 13A.

15B, the terminal plate 6 may be connected to the tip portions 14B and 1sB and further bent to form the connecting portion 6a of the terminal plate 6 in an upright manner as described above.

By configuring it like this! llL-shaped bending tip part 1
4B, , 16B into the guide hole 17, the first.
Since the second foil-like heating elements 14 and 15 can be positioned, it is expected to be effective in automating assembly.

Next, other embodiments will be described.

The difference from the above embodiment is that, as shown in FIG. 6, the first lead part 18a, the first tip part 18b of the second lead part (not shown), and the second tip part (not shown) are This is the point where it is folded back and becomes double.

That is, the joint surface 6a of the terminal plate 6 is connected to the first tip 18b, the connecting part 6b is erected downward as in the previous embodiment, and the collar 9 of the insulator 9 is attached by attaching the seam plate 10.
By pressing the joining surface 6a (z) through the ai, the heat generating parts near the first lead part 18a and the second lead part are heated by the spring properties of the first tip part 18b and the folded part of the second tip part. As a result, the heat dissipation of the heating element in the vicinity of the first lead portion 18a and the second lead portion becomes better, and the life of the heating element portion 6 can be further improved. At the same time, due to the springiness of the folded part, the first
The bond between the second tip 18b1 of the terminal plate 6 and the joint surface 6a of the terminal plate 6 becomes even stronger, and the electrical connection of this part and the strength of the downward standing position of the terminal plate 6 become even more reliable.

In addition, 1. shown in FIG. Second lead portion 14a.

The valley width H of 16a is the first. By making the width of each heat generating part pattern 14F, 1 sP of the second foil photothermal body 14, 16 twice or more, for example, both lead parts 14a, 16
The U-shaped exposed portion b increases, further increasing the cooling effect, and the amount of self-heating decreases, further suppressing the temperature rise in this portion.

Effects of the Invention As is clear from the description of the embodiments above, the uninvented planar heating element device has a heat transfer plate forming the aesthetic surface of the container and several layers of insulation on the back side of the heat transfer plate. A heating element is provided with a foil heating element interposed between each layer of the plate, and the heating element extends from the foil heating element, and the insulating plate is provided below the foil heating element. A roughly U-shaped lead part is formed by bending the lead part so as to sandwich the notch part of the lead part, and the joint surface of the abbreviated couminal plate is covered with leather lily at the tip of this lead part, and an insulating material is applied to cover this joint surface. By configuring the photothermal body part to be sandwiched and fixed between the seam plate and the sound transmission board, the lead part extends over the surface of the lower insulating plate of the photothermal body part in the shortest length. Since it is formed in a letter shape and has an exposed part, it is possible to suppress the temperature rise in that part, and it is possible to lower the temperature of the terminal plate and improve the durability of the connection part. ii
In addition, the heat generating part near the lid part is also firmly pressed, so
There is no floating of the foil photothermal element in this part, which greatly improves the service life, and the terminal plate is firmly fixed, improving safety. Furthermore, the power supply lead does not require a supplementary wire as in the prior art, and can be formed by joining the terminal plate to the extended lead portion of the foil-like optical unit, so that work efficiency is significantly improved.

Note that by folding back the tip of the lead part to form two violets, the heat generating part near the lead part can be pressed more intelligently, thereby making it possible to further improve the durability of the foil-shaped photothermal body.

In addition, by widening the width of the lead portion, the self-reflection of this portion can be reduced, and the exposed portion is widened, so that the cooling effect of the outside air is further effective, and as a result, the temperature of the terminal plate can be lowered.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a planar photothermal device according to an embodiment of the present invention, FIG. 2 is a sectional view of a main part of the same planar photothermal device with a part cut away, and FIG. A front view of the main parts of the facing light emitting device, Fig. 4 (1) An exploded perspective view of the light heating element part of the coplanar emitting body sheathing, Fig. 6 (-j: Heating element part of the coplanar emitting device) Section 6 is an exploded perspective view showing another example of how the leading end of the lead part and the insulating plate are connected, and Section 6 is a curved surface of the main part □□□ showing a part of the planar heating element device of the example of the same pond. Fig. 7 is a partially cutaway view of a conventional planar heating element device, and Fig. 8 is a plan view of the same board. ...Container, 6...
・・Mitsutsukabu, 6・・・・Terminal board, 6a・・
...Joining surface, end...Insulating material, 10...Seam plate, 11.12,13...1st. Second. Third
Insulating plate (insulating plate), 14.15... 1st. Second foil heating element (foil heating element), 14a, 16a...
...First. Second lead part (lead part), 14b, 15
b... 1st. Second tip (tip), 16.
...notch part. Name of agent: Patent attorney Takashi Awano Kuruma and one other person. Shikita 3 Q IG it Masu (Shirin Rental)

Claims (3)

[Claims] (1) A heat exchanger plate forming the bottom surface of the container, and a heat generating element section formed by installing a foil-shaped heating element between each layer of a plurality of layers of insulating plates on the back side of the heat exchanger plate, and this heating element section forming a substantially U-shaped lead portion extending from the foil heating element and bent so as to sandwich the notch of the insulating plate below the foil heating element;
The joint surface of the approximately L-shaped terminal plate is connected to the tip of this lead part, and the heating element part is fixed so as to be sandwiched between the seam plate and the heat transfer plate through an insulating material that covers this joint surface. A planar heating element device made of (2) Claim 1: The tip of the lead portion is folded back and doubled.
The planar heating element device described above. (3) The planar heating element device according to claim 1 or 2, wherein the width of the lead part is wider than the width of the heating part pattern of the foil heating element included in the lead part.