JP2002372380A - Heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a heating furnace that the structure is complicated and the cost is increased because heaters are secured surely and holding position of the heaters is difficult to alter. SOLUTION: In the heating furnace, a plurality of hooks 9 are provided, while being spaced apart in the longitudinal direction, on the thermal insulation material 1 side surface of flat strip heaters 2 arranged on the furnace surface side of the thermal insulation material. The hook has a part 9a extending to recede outward from the strip heater, and a part 9b orthogonal thereto wherein these parts are embedded under the surface of the thermal insulation material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating furnace, and more particularly to a heating furnace in which a belt-like heating element is held by a heat insulating material.

[0002]

2. Description of the Related Art Conventionally, as a heating furnace, it is better to form a heating element on the entire surface of the furnace and surround the entire outer surface with a heat insulating material. In this way, the temperature difference between the heating element and the furnace is reduced. By decreasing the temperature of the heating element to a lower temperature, the life of the furnace can be extended, but the temperature near the furnace end can be set higher than that inside the furnace in order to improve the soaking characteristics in the furnace. To increase the electrical resistance of the heating element, reduce the current flow, and use the commercial power as it is, place the strip-shaped heating element on the furnace inner wall as it is, or place it on the strip-shaped heating element as appropriate. Slits are provided and similarly arranged on the inner wall of the furnace.

[0003] In the conventional method for fixing the heating element to the inner wall of the furnace, for example, a fiber-like heat insulating material arranged on the outer surface of the heating element is used to hold the heating element.
A part of the holding material of the heat-resistant insulating material made of alumina is embedded, and the heating element is held at the remaining part which is protruded into the furnace inner surface, or the heating element is bent in a wave shape, and the part protruding toward the heat insulating material side is formed. A part is held by the solidified portion of the surface portion of the fiber-like heat insulating material.

FIGS. 3 and 4 are illustrations of the former, wherein 1 is a fibrous heat insulating material, 2 is a flat band-shaped heating element,
Reference numeral 3 denotes upper and lower holding members made of, for example, a heat-resistant insulating material made of alumina. Reference numeral 4 denotes a base of the upper and lower holding members 3 embedded and fixed in the fibrous heat insulating material 1. Reference numeral 5 denotes a dovetail-shaped recess and a projection formed for connecting the bases 4 of the upper and lower holding members 3 to each other.

FIGS. 5 and 6 are explanatory diagrams of the latter case, in which 6 is a solidified portion of the surface of the fibrous heat insulating material 1, 7 is a band-like heating element curved in a wave shape, and 8 is a surface of the heat insulating material 1. The strip-shaped heating element portion embedded in the solidified portion 6 is shown.

[0006]

However, in the former case, the production cost of the holding material made of a heat-resistant insulating material is high, and when it is desired to change the arrangement of the heating elements, it is necessary to change the shape of the holding material. It took a long time to change the mold and production, and it was difficult to respond with a short delivery time. In the latter case,
Since the hardness of the material of the heating element varies from lot to lot, it is difficult to control the corrugated shape, and in the case of deep bending and shallow bending, the value of the electrical resistance per unit length of the heating element varies, Further, even if the displacement in the direction of the adjacent heating element is small, there is almost no holding force in the direction of the center of the furnace with respect to the surface of the heating element. Due to a change in shape due to shrinkage, a part of the inside of the furnace protrudes greatly, and has a disadvantage that it cannot be used.

The present invention has been made to eliminate the above disadvantages.

[0008]

SUMMARY OF THE INVENTION A heating furnace according to the present invention comprises a heat insulating material, a flat band-shaped heating element arranged on the furnace surface side of the heat insulating material, and a long surface of the band-shaped heating element on the heat insulating material side. A plurality of hooks spaced apart from each other in the direction, and the hook has a portion extending outwardly away from the belt-shaped heating element and a portion orthogonal thereto, and this portion is embedded in the heat insulating material surface. It is characterized by having been done.

The hook is a plate material bent in a U-shaped cross section.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1 and FIG.
A plurality of hooks 9 are attached by being separated from each other in the longitudinal direction by welding or the like, and the hooks 9 are embedded in the surface portion of the fibrous heat insulating material 1 by, for example, vacuum forming. The hook 9 has, for example, a portion 9a extending away from the belt-shaped heating body 2 like an L-shape and a portion 9b bent in a direction perpendicular to the portion 9a.

Since the heating furnace of the present invention has the above-described configuration, the belt-shaped heating element 2 is securely held in the up-down direction and the horizontal direction with respect to the heat-insulating material 1, and changes in shape due to thermal expansion and contraction of the heating element. Thus, it is possible to reliably prevent a part from jumping into the furnace.

With the hook 9 attached to the heating element 2,
In addition, the arrangement of the heating element 2 can be changed only by changing the position at the time of embedding and fixing in the fibrous heat insulating material 1. Since heat-resistant insulating material is not used, the delivery time is extremely short, and 1/2 of the product cost.
In place of the heat-resistant insulating material occupying １ ／, a hook whose unit price is 1/10 or less of the heat-resistant insulating material is used, so that the manufacturing cost can be greatly reduced.

[0014]

As described above, according to the heating furnace of the present invention, the heating element can be securely fixed to the heat insulating material with an extremely simple structure, and there are great advantages such as easy change of the arrangement.

[Brief description of the drawings]

FIG. 1 is a front view of a heating element of a heating furnace according to the present invention.

FIG. 2 is a vertical side view of a heating element of the heating furnace shown in FIG.

FIG. 3 is a front view of a heating element of a conventional heating furnace.

4 is a vertical sectional side view of a heating element portion of the heating furnace shown in FIG.

FIG. 5 is a front view of a heating element of a conventional heating furnace.

FIG. 6 is a bottom view of a heating element of the heating furnace shown in FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 fibrous heat insulating material 2 band-shaped heating element 3 holding material 4 base 5 dovetail-shaped recess and projection 6 surface solidified portion 7 curved band-shaped heating element 8 buried band-shaped heating element portion 9 hook 9a extending portion 9b bent portion

Claims (2)

[Claims] 1. A heat insulating material, a flat band-shaped heating element arranged on the furnace surface side of the heat insulating material, and a plurality of hooks provided on the heat-insulating material side surface of the band-shaped heating element so as to be spaced apart in the length direction. Wherein the hook has a portion extending outward from the belt-shaped heating element and a portion orthogonal to the portion, and this portion is embedded in the surface of the heat insulating material. 2. The heating furnace according to claim 1, wherein said hook is a plate material bent in a U-shaped cross section.