JP2005129273A - Electric heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure for an electric heater which can be surely supported by a heating element itself, has high heat dissipation efficiency, and can be manufactured more inexpensively. <P>SOLUTION: In a configuration wherein the heating element (20) in which a meandering energization passage is formed by forming slits (21) alternately in a plate-like object is supported by an insulator (10), a part (23') left being projected from a circuit when forming slits (21) in the plate-like object is bent to form a leg part (23) for supporting in the insulator (10). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric heater.

Conventionally, as a conventional technique of the electric heater as described above, an electric heater having a support made of a molded body for supporting a heating element has been proposed as described in Patent Document 1 below.
Japanese Patent Laid-Open No. 10-283650

  However, since the prior art has a support made of a molded body, a separate member constituting the support is required, which has a considerable influence on thermal efficiency. Moreover, since the molded object used for a support body requires the member and structure with little influence on the heat dissipation function of a heater, it had to invite high cost.

  In view of such conventional circumstances, an object of the present invention is to provide a support structure for an electric heater that can be reliably supported by the heating element itself, has high heat dissipation efficiency, and can be manufactured at a lower cost.

  In order to achieve the above object, the electric heater according to the present invention is characterized in that, in a configuration in which slits are alternately formed in a plate-like body, and a heating element having a meandering current path is supported by an insulator, That is, when the slit is formed in the plate-like body, a portion left in a state of protruding from the circuit is bent to form a leg portion for supporting the insulator.

  As described above, according to the characteristics of the electric heater according to the present invention, since the heating element itself has the support structure, the heat dissipation efficiency can be improved while the heating element can be reliably supported. In addition, since a structure that supports a heating element such as a rod-like support using a member that tends to be expensive due to problems with heat dissipation efficiency and strength, it is possible to manufacture at a lower cost.

  Other objects, configurations, and effects of the present invention will become apparent from the following embodiments of the present invention.

  Next, a first embodiment of the present invention will be described with reference to FIGS. 1 (a) and 1 (b). As shown in FIG. 1 (b), the electric heater 1 according to the present invention generally includes a ceramic board 10 using a ceramic having excellent heat insulating properties that supports the heating element 20, and the heating element 20.

  As shown in FIG. 1A, the heating element 20 includes a slit 21, an edge portion 22, and a leg portion 23. A plurality of slits 21 are alternately formed so as to intersect the longitudinal direction of the heating element 20, and the heating element 20 has a pair of slits 21 in which openings are formed in the same direction as a portion constituting a meandering circuit. , 21 and a portion 23 ′ protruding from the circuit.

  Then, a pair of projecting portions 23 ′ and 23 ′ in which the directions of the slits 21 are different from each other are bent substantially perpendicularly from the root portion to the ceramic board 10 side to form the leg portions 23 and 23. The pair of leg portions 23 and 23 are inserted into the ceramic board 10 substantially vertically so that the heating element 20 is parallel to the ceramic board 10 and supports the heating element 20.

Next, a modified example of the first embodiment of the present invention will be described.
The modification shown in FIG. 3 differs in the insertion angle of the leg portion 23 to the ceramic board 10. The pair of protrusions provided on the heating element 40 are bent at an angle of 90 degrees or more with respect to the heating element 40 so that the tip ends of the pair of protrusions are separated from each other to form a pair of leg parts 43 and 43. The pair of leg portions 43, 43 is inserted into the ceramic board 10 so as to be inclined so that the heating element 40 is parallel to the ceramic board 10, and supports the heating element 40.

Next, still another embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the member similar to previous 1st embodiment.
In the second embodiment shown in FIGS. 2A and 2B, the shape of the heating element is different. As shown in FIG. 2B, the heating element 30 is curved so that both ends are separated from the ceramic board 10 around the central portion in the width direction of the heating element 30. In addition, the heating element 30 is provided with a slit 31, an edge 32, and a leg 33 as in the first embodiment. The pair of projecting portions 33 ′ and 33 ′ are bent on the ceramic board 10 side so as to be substantially perpendicular to the ceramic board 10 to form a pair of leg portions 33 and 33. The pair of leg portions 33 and 33 are inserted into the ceramic board 10 almost vertically so that the heating element 30 is not inclined to one side, and supports the heating element 30.

  In addition, the modified example of the first embodiment shown in FIG. 3 applies the modified example as long as the heating element can be supported so as not to tilt even if the heating element is curved as in the present embodiment. It doesn't matter.

  The third embodiment shown in FIG. 4 differs in the bending direction of the protrusion. The heating element 50 is provided with a slit 51, an edge portion 52, and a leg portion 53 as in the above-described embodiments.

  Of the pair of protrusions 53 ′ and 53 ′, one protrusion 53 ′ is substantially perpendicular to the plane of the heating element 50 and relative to the ceramic board 10 with reference to an arbitrary position on the adjacent protrusion 53 ′ side. And is bent so as to be separated from the other adjacent protrusion 53 ′. As shown in FIG. 4B, the pair of projecting portions 53 ′ and 53 ′ are bent symmetrically to form a pair of leg portions 53 and 53. The pair of leg portions 53, 53 are inserted into the ceramic board 10 so that the heating element 50 is parallel to the ceramic board 10 and supports the heating element 50.

  In the fourth embodiment shown in FIG. 5, a plurality of slits 61 and protrusions 63 'formed in the heating element 60 by punching are alternately formed so as to intersect the longitudinal direction, and the heating element 60 has a meandering circuit. It is composed. The slit 61 is a part cut out after punching and the protruding part 63 ′ is a remaining part. As shown in FIG. 5 (a), the protrusion 63 ′ is a pair of adjacent protrusions 63 ′ and 63 ′, which are bent almost vertically to the ceramic board 10 side to form legs 63 and 63. . The pair of legs 63 and 63 are inserted into the ceramic board 10 so that the heating element 60 is parallel to the ceramic board 10 and supports the heating element 60.

  The electric heater according to the present invention can be used as a heater for heat treatment of glass, ceramic and metal. Further, the present invention can be applied to a reaction furnace and a diffusion furnace, and can be used in a low temperature environment of, for example, about 700 ° C. to 900 ° C. or a high temperature environment of, for example, over 1200 ° C.

(A) is a top view of the electric heater which concerns on this invention, (b) is AA sectional drawing of (a). (A) is a top view which shows 2nd embodiment of this invention, (b) is BB sectional drawing of (a). It is FIG.1 (b) equivalent figure which shows the modification of 1st embodiment of this invention. (A) is a top view which shows 3rd embodiment of this invention, (b) is sectional drawing of (a). (A) is a top view which shows 4th embodiment of this invention, (b) is CC sectional drawing of (a).

Explanation of symbols

  1: Electric heater, 10: Insulator (ceramic board), 20: Heating element, 21: Slit, 22: Edge part, 23: Leg part, 23 ': Protruding part, 30: Heating element, 31: Slit, 32: Edge, 33: Leg, 33 ': Projection, 40: Heating element, 42: Edge, 43: Leg, 50: Heating element, 51: Slit, 52: Edge, 53: Leg, 53' : Projection, 60: Heating element, 61: Slit, 62: Edge, 63: Leg, 63 ': Projection

Claims (1)

Slits (21, 31, 51) are alternately formed on the plate-like body, and the heating element (20, 30, 40, 50, 60) having a meandering current path is supported by the insulator (10). When the slit (21, 31, 51) is formed in the plate-like body, an electric heater is bent and supported by the insulator (10) by bending a portion left in a state of protruding from the circuit An electric heater characterized by forming leg portions (23, 33, 43, 53, 63).

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