JP2006080058A - Electric heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric heater with a simple structure surely supporting a heating element and having high heat radiation efficiency. <P>SOLUTION: In constitution wherein a spiral heating element is inserted in a groove formed in an insulator, the heating element 5 is formed flat. The groove 3 is formed so that a longitudinal direction line LW of a cross-section of the heating element 5 is parallel to a plane of the insulator 2. The front part of the heating element 5 is exposed from an opening part of the groove 3 along a longitudinal direction width W of the cross-section. The heating element 5 is fixed in the groove 3 at least at one side or a rear side of the cross-sectional longitudinal direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electric heater. More specifically, the present invention relates to an electric heater in which a spiral heating element is inserted into a groove formed in an insulator.

As an electric heater, for example, as described in the following patent document, an electric heater provided with a structure for preventing dropping is conventionally known. In addition, as shown in FIG. 8, it is also known that an opening is formed wider than a heating element in which an opening is wound in a circular shape by winding the heating element in an ellipse.
JP-A-8-264270 JP-A-7-296957

  However, the invention described in Patent Document 1 still has a complicated structure and the opening of the heating element groove is less than or equal to the outer diameter of the heating element winding, so that heat tends to stay inside, resulting in a reduction in heat dissipation efficiency. It was. Moreover, although the invention described in Patent Document 2 is excellent in heat dissipation efficiency, the structure is complicated, and there is a limit to the reduction in manufacturing cost.

  Further, in the type shown in FIG. 8, a part of the front surface of the heating element wound in an ellipse is closed with a heat insulating material in order to hold the heating element. As a result, the openings could not be taken sufficiently and the heating element was buried in the heat insulating material, so that the heat dissipation efficiency was not good.

  In view of such a conventional situation, an object of the present invention is to provide an electric heater that has a simple structure, reliably supports a heating element, and has high heat dissipation efficiency.

In order to achieve the above object, the electric heater according to the present invention is characterized in that a spiral heating element is inserted into a groove formed in an insulator,
The heating element is formed in a flat shape, the groove is formed so that the longitudinal line of the cross section of the heating element is parallel to the plane of the insulator, and the front part of the heating element has a longitudinal width of the cross section. The heating element is fixed in the groove at least on one side or the rear side in the longitudinal direction of the cross section.

  According to the same feature, the heating element is formed in a flat shape, and the front portion of the heating element is exposed from the opening of the groove along the longitudinal width of the cross section. The heat dissipation efficiency was improved. Moreover, since the said heat generating body is being fixed in the said groove | channel at least in the one side or rear part of the cross-sectional longitudinal direction, a heat generating body can be fixed efficiently, without preventing heat dissipation. When the heating element is fixed at least on one side in the longitudinal direction of the cross section, the heating element can be efficiently fixed to a vertical wall surface or an obtuse angle wall with the support portion being minimized. Further, when the heating element is supported in the groove at the rear portion, the heating element can be reasonably supported even in a horizontal state.

  In the above feature, a rod-shaped body may be passed through the heating element, and the heating element may be fixed to the groove at least on one side in the longitudinal direction of the cross section by the rod-shaped body. A pair of rod-shaped bodies may be passed through the heating element, and the heating element may be fixed to the groove at least on both sides in the longitudinal direction of the cross section by the rod-shaped bodies.

  On the other hand, you may fix the said heat generating body with the adhesive agent with which the notch formed in the said groove | channel was formed in the one side of the cross-sectional longitudinal direction, or the rear part of a heat generating body.

  According to the characteristics of the electric heater according to the present invention, since the heating element is fixed in the groove using a rod-like body or an adhesive, the structure is simple and the heating element can be reliably supported. In addition, it is possible to provide an electric heater with high heat dissipation efficiency by increasing the exposed portion of the heating element.

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

Next, the present invention will be described in more detail with reference to the accompanying drawings as appropriate.
As shown in FIGS. 1 and 2, the electric heater 1 according to the present invention generally includes an insulator 2, a heating element 5, and a fixing member 8. A plurality of grooves 3 are formed in the insulator 2, and a heating element 5 is inserted into each groove 3. The width and depth of the groove 3 are formed to be approximately the same or slightly larger than the longitudinal width W and the short side width T of the heating element, respectively, and hold the heating element 5.

  As shown in FIG. 2, the groove 3 is formed in a substantially rectangular shape in the longitudinal direction of the insulator 2, and as shown in FIG. 3, the longitudinal line LW of the cross section of the heating element 5 is the plane of the insulator 2. It is formed so as to be substantially parallel and vertical. Therefore, the short side direction line of the cross section of the heating element 5 is substantially horizontal.

  The heating element 5 has a spiral shape as shown in FIG. 2, and the spiral heating element 5 has a flat cross-sectional shape as shown in FIG. In the present embodiment, the shape is a flat shape formed by a semicircular arc and a straight line, but may be a flat shape formed by an ellipse.

  A rod-like body (insulator) 6 longer than the width of the insulator 2 is inserted into the heating element 5 formed in a flat shape. Then, the heating element 5 passed through the rod-like body 6 is inserted and fixed in the groove 3 so that its cross section is parallel to the plane of the insulator 2 as shown in FIG. As a result, the entire front surface of the heating element 5 can be exposed through the opening of the groove, and a heating element with a high heat dissipation effect can be obtained. In the present embodiment, a round wire having a circular cross-sectional outer shape is used as the heating wire of the heating element 5.

  As shown in FIG. 3, the heating element into which the rod-like body 6 is inserted is inserted into the hole 7 provided in the furnace wall 4 at the end of the rod-like body 6, and the rod-like body 6 is fixed by the fixing member 8 at appropriate intervals in the groove 3. Is fixed to the insulator 2 such that the longitudinal length W of the cross section of the heating element 5 is substantially parallel to the plane of the insulator 2. Thereby, the heating element 5 is securely attached to the insulator 2.

  Next, a second 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. The first to third embodiments can be applied to a vertical wall and an obtuse angle wall, and the fourth and fifth embodiments can be applied to horizontal and inclined walls.

  In the second embodiment shown in FIG. 4, a notch 9 a is formed at the upper end of the groove 3. And the heat generating body 5 formed similarly to the said embodiment is inserted in the groove | channel 3. FIG. Unlike the above-described embodiment, this embodiment does not have the rod-like body 6, and an insulating adhesive 10 is injected in the vicinity of the notch 9 a of the heating element 5 inserted in the groove 3, and the adhesive 10 generates heat. The body 5 is fixed to the insulator 2. The notches 9a are formed by cutting along the longitudinal direction of the heating element 5, but may be formed intermittently in the longitudinal direction.

  Further, in the third embodiment shown in FIG. 5, a notch 9 a is provided at substantially the center of the groove 3, and the heating element 5 is fixed to the insulator 2 by the insulating adhesive 10 as in the above embodiment.

  In the first to third embodiments, the longitudinal direction line LW of the cross section of the heating element 5 of the groove 3 is arranged so as to be substantially perpendicular to the plane of the insulator 2. However, in the fourth and fifth embodiments shown in FIGS. 6 and 7, the long side W is formed to be substantially horizontal. Further, the fourth embodiment shown in FIG. 6 is different in that the rod-like bodies 6 and 6 and the fixing members 8 and 8 are provided in pairs to maintain horizontal support.

  The electric heater according to the present invention can be used as a heater for heat treatment of glass, ceramic and metal. It can also be applied to a pottery furnace, a reaction furnace, and a diffusion furnace.

It is sectional drawing of the electric heater which concerns on this invention. It is an enlarged front view of the groove | channel which concerns on this invention. It is AA sectional drawing of FIG. FIG. 4 is a view corresponding to FIG. 3 according to a second embodiment of the present invention. FIG. 4 is a view corresponding to FIG. 3 according to a third embodiment of the present invention. FIG. 6 is a view corresponding to FIG. 3 according to a fourth embodiment of the present invention. FIG. 10 is a view corresponding to FIG. 3 according to a fifth embodiment of the present invention. It is sectional drawing of the conventional electric heater.

Explanation of symbols

1: Electric heater,
2: insulator,
3: Groove
4: Furnace wall
5: heating element,
6: Rod-shaped body (insulator),
7: hole,
8: fixing member,
9a, 9b: notches,
10: Adhesive 11: Ceramic paper LW: Longitudinal line W: Longitudinal width T: Short side width

Claims (4)

An electric heater in which a spiral heating element (5) is inserted into a groove (3) formed in an insulator (2),
The heating element (5) is formed in a flat shape,
Forming the groove (3) so that the longitudinal line (LW) of the cross section of the heating element (5) is parallel to the plane of the insulator (2);
Exposing the front part of the heating element (5) from the opening of the groove (3) along the longitudinal width (W) of the cross section;
An electric heater characterized in that the heating element (5) is fixed in the groove (3) at least on one side or rear part in the longitudinal direction of the cross section. A rod-shaped body (6) is passed through the heating element (5), and the heating element (5) is fixed to the groove (3) at least on one side in the longitudinal direction of the cross-section by the rod-shaped body (6). The electric heater according to claim 1. A pair of rod-like bodies (6) are passed through the heating element (5), and the heating element (5) is fixed to the groove (3) at least on both sides in the longitudinal direction of the cross section by the rod-like bodies (6). The electric heater according to claim 1. The heating element (5) is fixed by an adhesive (10) filled in a notch (9a) formed in the groove (3) at one side in the longitudinal direction of the cross section or at the rear part of the heating element (5). The electric heater according to claim 1.

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