JP2555071Y2 - Mica heater - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a mica heater for heating equipment.

[0002]

2. Description of the Related Art Conventionally, this type of mica heater generally has a configuration as shown in FIGS. That is,
The wound mica plate 22 around which the heating wire 21 is wound is replaced with the insulating mica plate 2
3 and held by a seam plate 24 and a holding plate 25 to form a heating element 26.

[0003]

When such a conventional heating element is bent and attached to a heating container or the like, a strong force is required for bending, and the bending is not uniform, and a portion of the heating element is in contact with the heating container. There is a problem that the heat transfer is poor due to the formation of voids, the heating efficiency is reduced, and the life of the heating element is deteriorated. Further, the seam plate 24 is made of a metal that requires flexibility, and the presser plate 25 is made of a metal that requires rigidity. Due to the difference in the coefficient of thermal expansion between the two, the following defects occur. That is, there is a danger that the mutual positions of the two will gradually shift due to the heat generation and cooling of the heater and that they will come into contact with the heating wire and cause an electric shock accident. Further, seam processing is required also in the manufacture of the heater, and the seam plate also requires large dimensions, which is expensive. Furthermore, when the seamed heater is wound around a cylindrical container, a deviation occurs in the outer diameter of the heater, and an excessive force is applied to the heating wire to easily break the heater.

The present invention solves the above problems,
By facilitating the attachment and improving the close contact with the heating vessel, the workability and reliability of winding are improved, and the above-mentioned displacement of the heater is prevented, and the danger of electric shock and the like is eliminated. It has the purpose to provide a mica heater comprising a plurality of heating circuits.

[0005]

According to the present invention, a first insulating mica plate provided on a side contacting the outside of a heating vessel is provided. A wound mica plate having a plurality of heat generating portions provided thereon, a second insulating mica plate disposed outside the wound mica plate, and a metal mica disposed outside the second insulating mica plate. and a pressing plate, provided with a slit hole and the guide hole in the metal pressing plates, the first, portion in the second insulating mica plate notch guide provided between said plurality of heat generating portions Wherein the first and second insulating mica plates and wound mica plates are provided.
The holding bracket that holds the
If a cut-and-raised part is provided corresponding to the guide hole,
Both Guy provided so as to correspond to the slit holes
The mica heater has a bent portion .

[0006]

SUMMARY OF Invention The present invention by hand stage described above, when mounting bent in heating vessel or the like, flexibility does not require a strong force to bend enough so can be secured, also pliable becomes uniform heating container Since no air gap is formed on the contact surface with the heater, the heat transfer is good, and the wire temperature of the heating wire is kept low, so that the life of the heating element does not deteriorate. Further, since there is no seam plate as in the related art, there is no difference in expansion and contraction due to repetition of heating and cooling of the heater, and there is no displacement of the heater components.

[0007] Also, several winding mica plate birefringence, on the first and second insulating mica plate and the pressing plate, between these heaters generating components when mounted on the container prevents the displacement downward And absorbs longitudinal dimensional expansion due to heat.

[0008] Further, in the guide bent portion of the holding metal fitting simply by inserting the slit so takes pawl is caught by the metal retainer plate can be easily held at the same time retaining bracket and the mounting, the bending press said hanging pawl portion Thus, the operation of securely fixing the holding bracket can be easily performed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIGS. 1 to 5, reference numeral 1 denotes a mica heater main body, which comprises a plurality of wound mica plates 2 and 20 around which heating wires 3 and 30 are wound, and a first insulating mica plate 4 and a second insulating mica plate 5 respectively. After holding the guide bending portion 16 of the holding metal fitting 7 in the slit holes 12 provided at both ends of the flat metal holding plate 6, it is bent gently (in the direction of F in FIG. 1) and held (7a, 7b). ) And the first insulating mica plate 4
And a guide step 1 at both ends of the second insulating mica plate 5.
4 and a guide notch 15 are provided, and a guide hole 13 is provided at substantially the center of both ends of the flat metal holding plate 6.
A cut-and-raised portion 17 is provided substantially at the center of the guide bent portion 16 of the holding member 7 and the guide bent portion 16 is attached to the guide step 14, so that the positional deviation between the heater components (N direction and S direction in FIG. 1). Position) is regulated. A hook 18 formed by cutting and raising is provided in the guide bent portion 16 of the holding member 7, and when it is mounted in the slit hole 12, it is caught and held by the metal holding plate 6 and received by the slit hole 12. Can be bent easily. The winding and holding of the mica heater 1 around the outer periphery of the heating vessel 10 is performed by a spring 19. The spring 19 also has a function of absorbing loosening of the connection with the heating container due to thermal expansion when the mica heater 1 generates heat.

[0011]

As described above, according to the present invention, the first insulating mica plate provided on the side in contact with the outside of the heating vessel and the plurality of heat generating portions provided outside the first insulating mica plate are provided. Having a wound mica plate, a second insulating mica plate disposed outside the wound mica plate, and a metal pressing plate disposed outside the second insulating mica plate, with the metal of the pressing plate is provided with slits and the guide hole, the first, the second insulating mica plate is provided the guiding notch portion provided between the plurality of heat generating portions, the first, second Second insulating mica
The metal fittings for holding the plate and wound mica plate
A cut-and-raised portion is provided corresponding to the
Since the mica heater has a guide bent portion provided to correspond to the slit hole and to correspond to the slit hole, an electric cooker employing the mica heater uses a plurality of heat generating circuits as shown in FIG. It can exhibit its function, and its thermal efficiency is much higher than that of a layered heating section. Furthermore, when bending and attaching a mica heater to a heating vessel, etc., sufficient flexibility can be secured, so it is strong to bend. No force is required, workability is improved, and bending is easy to be uniform, so there is no gap in the contact surface with the heating vessel, so heat transfer is good, the wire temperature of the heating wire is kept low, and the life of the heating element is reduced. The reliability can be improved without deterioration.

Further, the present invention can absorb the thermal expansion in the longitudinal direction of the mica plate prevents the shift the position deviation of the Heater parts mutually are restricted, resulting heater safety and long life from this surface This is extremely advantageous in terms of cost.

[0013] Further, since the guide bent portion is provided with a hook formed by cutting and raising, it is mounted on the slit hole and simultaneously caught and held by the holding plate, so that the bending and fixing work after mounting is extremely easy and workability is improved. It is possible to hold the heater component excellent in the above.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part of a mica heater showing an embodiment of the present invention.

2A is a sectional view of a mica heater showing an embodiment of the present invention, and FIG.

FIG. 3 is a circuit diagram showing an embodiment of the present invention.

FIG. 4 is an external view showing an attached state of the embodiment of the present invention.

FIG. 5 is an external view of a mica heater showing one embodiment of the present invention.

FIG. 6 is an external view of a conventional mica heater.

FIG. 7 is a sectional view taken along line YY of FIG. 6;

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 Mica heater body 2, 20 wound mica plate 3, 30 heating wire 4 first insulating mica plate 5 second insulating mica plate 6 metal holding plate 7 holding bracket 12 slit hole 13 guide hole 14 guide step 15 guide Notch for guide 16 guide bent part 17 cut and raised part 18 hook

Claims (2)

(57) [Scope of request for utility model registration] A first insulating mica plate provided on a side in contact with the outside of the heating vessel; a wound mica plate having a plurality of heat generating portions provided outside the first insulating mica plate; a second insulating mica plate disposed outwardly of the mica plate, the second insulating and a metal holding plate which is disposed outwardly of the mica plate, said the metal of the pressing plate slit A hole and a guide hole are provided, and the first and second insulating mica plates are provided with guide notches provided between the plurality of heat generating portions,
The first and second insulating mica plates and the wound mica plates are retained.
The holding bracket has a guide notch
With a cut-and-raised part to correspond to the guide hole
To guide folding provided so as to correspond to the slit holes
Mica heater with bent section . 2. The microphone according to claim 1, wherein the guide bent portion is provided with a hook formed by cutting and raising.
Ta .