DE8806344U1 - Device for holding electrical heating elements in an industrial furnace - Google Patents

Description

Device for holding electrical heating elements in an industrial furnace.

The invention relates to a device for holding electrical, meander-shaped heating conductors at a distance from the hot side of insulating bodies made of ceramic fibers in industrial furnaces, whereby the heating conductors are held in the areas of their deflections by metallic anchors arranged on the insulating bodies.

Anchors made of high-temperature-resistant metal of the type described above, which are known from operational practice, each end in a load-hook-like bend arranged at a distance from the hot side of the insulating body, with the mouths of these load-hook-like bends of two anchors following one another in the length of the heating conductor facing each other. In addition, the two legs of the load-hook-like bends are relatively long in order to be able to hold the heating conductors when the latter have reached operating temperature as a result of heating, for example to 1000 ° C and more.

However, when the heating conductor heats up, the metallic anchors also heat up accordingly.

However, it has been shown that the anchors, heated to 1000°C and possibly even more, deform due to their own weight to such an extent that the heating conductors can no longer be held in the correct and secure position, even though the anchors are made of high-alloy, high-temperature-resistant metal.

A The object of the invention is to improve a device of the type specified in the preamble of claim 1 in such a way that a higher dimensional stability of the anchors than previously can be achieved using simple means and measures.

The solution to this problem is that the armatures each have only one leg that extends laterally from the armature shaft and is arranged at a parallel distance to the hot side of the insulating body and holds a heating conductor.

This means that, compared to the known anchors, without changing the material from which the anchors are made,

· I III · It · ·

• · &Lgr;

· 9··

are provided, the dead weight of the anchor parts protruding from the insulating body and engaging the heating conductor is reduced by more than half, thus increasing the dimensional stability of the anchors and thus the correct and secure positioning of the heating conductor by more than double than before. The amount of material used is also reduced.

From a manufacturing point of view, it is particularly advantageous if the legs of the anchors are bent at right angles to the anchor shafts.

To secure the position of the heating conductors, it is also advantageous if the legs of the anchors have end sections bent towards the hot side of the insulating body.

An independent invention, which also leads to a further increase in the positionally correct and positionally secure holding of the heating conductor(s) with the previously described design of the anchors, consists in the fact that the anchors have console-like supports that extend laterally from the anchor shafts and rest against the hot side of the insulating bodies.

••••«ti ·· *

· · I

Particularly in the case of heating conductors held on the side walls of the industrial furnace, it is advantageous if the supports are arranged below the anchor shafts so that the bracket-like supports counteract any downward bending of the anchor parts protruding from the insulating bodies caused by gravity.

A material-saving design of the supports is characterized in that they are designed as a straight rod running parallel from the anchor shaft to the anchor leg, whereby preferably the support is also welded to the anchor shaft...

It is also possible to form the bracket-like support by folding the anchor shaft to the side.

A further embodiment which is advantageous in terms of the purpose of the present invention is characterized in that a V-shaped piece forming the support is attached to the anchor shaft, whereby one leg of the angle piece rests against the anchor shaft, but the other leg of the angle piece is bent towards the

-S-

Anchor legs are aligned and arranged at a parallel distance.

The angle piece is preferably attached to the anchor shaft by welding. However, it is also possible for the leg of the angle piece that rests on the anchor shaft to have clamps that enclose the anchor shaft and can be molded onto the angle piece.

Another design of the above-described anchor, which can be manufactured in one piece, consists in that a bending section forming the support is arranged on the anchor shaft, to which a section running approximately parallel to the anchor shaft is connected towards the free end of the anchor, from which the leg holding the heating conductor is bent in the opposite direction to the aforementioned bend.

Embodiments of the invention are shown in the drawing and are described in more detail below.

Show it

Fig. 1 shows part of a ceiling-mounted

f · r'r-· r · ft·

- 10 -

furnace-held, electrical, meander-shaped heating conductor,

Fig. 2 a variant of a heating element holder arranged on the side wall of an industrial furnace,

Fig.3-5

Further designs of heating conductor holders.

According to Fig. 1, two successive anchors 3 made of high-temperature-resistant metal are shown in an insulating body made of ceramic fibers in the longitudinal extension of a meandering heating conductor 2 for holding the heating conductor. The anchors each grip the bends of the heating conductor 2. The shafts of the anchors 3 are directed at right angles to the hot side 5 of the insulating body and are embedded in the insulating body 1 in a virtually inseparable manner. On the shafts 4 of the anchors 3 protruding from the insulating body 1, a leg 6 is formed which runs parallel to the hot side 5 of the insulating body and is arranged at a great distance from the hot side.

The legs 6, on which the bends of the heating conductor 2 are supported, are directed opposite to each other.

f I *

- 11 -

The leg 6 of the left-hand armature 3 has an end part 7 bent towards the hot side 5 of the insulating body 1, which allows the heating conductor 2 to be hooked in, but in use

uco uciuicii/cio c cm

This makes it more difficult and prevents relative displacement of the heating conductor 2 to the left-hand armature 3. The leg of the right-hand armature 3 is straight and long enough that the heating conductor 2, which has been heated to operating temperature and whose length increases in the process, can move along the leg 6 and is held securely in place.

The anchors 3 are made in one piece from wire sections with a circular profile. Their shaft parts engaging in the insulating body have projections (not shown) that protrude to the side and that secure the anchors 3 against twisting around their longitudinal axis and also fix them in the direction of the longitudinal extension in the insulating body 1.

The anchors 3 of the holder shown in Fig. 2 for a meander-shaped electrical heating conductor 2 at a distance from the hot side 5 of a vertically arranged insulating body 1 each have a bracket-like support 8 resting on the hot side 5.

• · t · · ta*«»·

- 12 -

The support 8 of the lower anchor 3 is designed as a straight rod running parallel to the leg 6 of the anchor 3, aligned and welded to the anchor shaft 4.

The shaft of the upper anchor 3 has a bend pointing downwards at a right angle, resting on the hot side 5 of the insulating body 1 and forming a bracket-like support 8, to which a section 9 running parallel to the anchor shaft ¹ J is connected towards the free end of the anchor 3, from which the leg 6 is bent.

In the anchor 3 shown in Fig. 3, the support is formed by a right-angled angle piece 10 welded to the anchor shaft 4. The angle piece leg welded to the anchor shaft 4 runs parallel to the anchor shaft 4, while the other angle piece leg is arranged in the same direction as the anchor leg 6.

According to Fig. H , a U-shaped angle piece 10 ^f is welded to the anchor 3 to form a support δ, with both angle piece legs being aligned in the same direction to the anchor angle piece 6.

- 13 -

In the anchor 3 shown in Fig. 5, the support 8 is formed by a fold of the anchor shaft ¹ J in the same direction as the anchor leg 6.

All new features disclosed in the text of the drawing are considered essential to the invention.

c6* c. ti

Claims (13)

* f &igr; · r ( &igr; *ff » fff If Ing. grad. ' Roland Abicht: Habichtweg l : : : Ennepetal Ii 9-5-1988 Protection claims 1. Device for holding electrical, meander-shaped heating conductors at a distance from the hot side of insulating bodies made of ceramic fibers and/or 6mn cA* &w fbfarför* in industrial furnaces, the heating conductors being held in the region of their deflections by metallic anchors arranged on the insulating bodies, characterized in that the anchors (3) each have only one leg (6) which extends laterally from the anchor shaft (λ ) and is arranged at a parallel distance to the hot side (5) of the insulating bodies (1) and which holds a heating conductor (2). 2. Device according to claim 1, characterized in that the legs (6) of the anchors (O) are each at right angles to the anchor shafts (H) . 3. Device according to claim 1 or 2, characterized in that the legs (6) of the anchors (3) for the insulating bodies (1) have end portions (7) bent towards the hot side (5). 4. Device according to one of claims 1 to 3, characterized in that the anchors (3) have bracket-like supports (8) which extend laterally from the anchor shafts (4) and rest against the hot side (5) of the insulating bodies (1). 5. Device according to claim 4, wherein the heating conductors are arranged on approximately vertical side walls of the industrial furnace, characterized in that the supports (8) are each arranged below the armature shafts (4). 6. Device according to one of claims 4 or 5, characterized in that the support (8) is designed as a straight rod running parallel from the anchor shaft (4) to the anchor leg (6). 7. Device according to claim 6, characterized in that the support (8) designed as a rod is welded to the anchor shaft (4). 8. Device according to one of claims H to 6, characterized in that the support (8) is formed by a fold of the anchor shaft (U). 9. Device according to one of claims U or 5, characterized in that an angle piece (10) forming the support (δ) is attached to the anchor shaft (U), whereby one leg of the angle piece (10) rests against the anchor shaft (U), the other angle piece leg, however, is arranged at a parallel distance from the bent anchor leg (6). 10. Device according to claim 9, characterized in that the angle piece (10, 10') is welded to the anchor (3). 11. Device according to claim 9, _{characterized} in that the leg of the angle piece (10) resting on the anchor shaft (U) has clamps enclosing the anchor shaft (U). 12. Device according to claim 11, characterized by clamps formed on the angle piece (10). 13. Device according to claim 1 or 5, characterized in that a bend forming the support (8) is arranged on the armature shaft (1), to which a section (9) running approximately parallel to the armature shaft ( ¹⁰ ) adjoins towards the free end of the armature (3). From this section, the leg (6) holding the heating conductor (2) is bent in the opposite direction to the aforementioned bend.