DE1925565U - HEAT-RESISTANT INTERMEDIATE FOR CERAMIC HEATING CONDUCTOR SUPPORT. - Google Patents

Description

RA.-426675i.1U.B5

"R" R G

BROWN, BOVBRI & CIE "r'.y -'.- y

_{Aktiengesellschaft:;} ; "■:

Mannheim ^'-'-:

Mannhe im, d en % B.-1 965

, » _Wr _. _{/ rir} -:. Pat / Dr.F / W

¹¹ Heat-resistant spacer for - ceramic heat conductors -. "■". carrier "\ -. ■;" ... "■ '- ■■ ·" - ^:.

Hay _; tion. -. -; ". - .."';.

The ffiMfflSSlC: relates to a ceramic spacer for holding tion of horizontally arranged tubular, ceramic heating conductor carriers in a metal heating pipe. -

The problem on which the present iJSBtisöhaaDg is based is. is as follows: Electrical ^u eizleiter, for example, in spiral, grooves are wound on tubular ceramic supports, are in a metallic ^u eizrohr round ^{equidistantly:} - be held, particularly when the is heaters in operation "This requirement is, however, in the previously known construction methods are not met. Because according to the current state of the art, the armature supports are held concentrically to the heating pipe, a design that holds the same distance in the heating pipe when the heating conductor is switched off, but not during operation Heating conductors in the form of heating coils in a spiral. is wrapped in a ceramic carrier. The axis of heating—. The conductor spiral thus shifts as a result of the operational heat exposure and the corresponding sag below the axis of the heating pipe and the heating conductor support. ■ '■■■

It is known to hold a number of heating conductors, carriers axially one after the other in heating pipes and by means of a connecting rod and screw connection together with ^: an end plate, which in turn is connected to anv;. ;;. Flange is screwed concentrically. Concentric, ceramic, disk-shaped support bodies are also known from the individual heating conductor carriers, which, however, only hold the electrical conductor spiral concentrically in the heating pipe when it is cold

The! Ule% aäung is now the. Srfahr & ng-: based on the fact that a con-. ¹ central arrangement of heating conductor supports. around the heating pipe fol-, .. "-

disadvantages and risks: The sagging of the heating conductor spiral as a result of the operational heating has a different heat distribution up and down along the heating pipe. In addition, however, there is the risk that as a result of the sag the heat conductor spiral body connection on the heating pipe and interturn connection in the heat conductor spiral occurs especially when In the course of time, scaling has occurred in the heating pipe with deposits of scaled material at the endangered point, down along the length of the heating pipe. These disadvantages' and dangers are remedied in a simple manner by the new feature.

According to the present innovation, the intermediate piece acts as a spacer serving projections, of which the downwardly directed have a greater radial length than those after facing up.

In the following, the furnace is based on an exemplary embodiment explained on the basis of two figures: They show:

Pig. 1 shows an electrical heating tube in cross section according to Line I - I, with an axial plan view of an intermediate piece;

Pig. 2 the same point on the heating pipe in a longitudinal section.

In a metal eizrohr 1 with the axis 11 in waagereenge measure
The arrangement lies neiierungs-eccentrically, above the axis 11, ceramic, tubular heat conductor carriers' 2, 7 with the axis 22. On the surface of the heat conductor carrier grooves 8 are embedded in a spiral shape, in which heating coils 3 are embedded. Between the heat conductor carriers 2, 7 there is a ceramic intermediate piece 6 with lateral neck extensions 4 which protrude into the tubular heat conductor carriers 2, 7 and have projections 5 »9 in the middle between them in a radially symmetrical arrangement. According to the furnace, the downwardly directed projections 9 have a greater radial length 9 than the upper projections 5

the projections 9 - 5 is new 3mngsgeniüt the Measure the sag b of the heating conductor spiral when it is hot. The intermediate pieces 6 are supported with their lower projections 9 ■. on the lower inner wall of the heating tube -1; they support so that the heat conductor carrier 2, 7 eccentrically, at a distance a above the heating pipe axis - 11. It is therefore a - b ,. the maximum Slack in the heating conductor spiral. This is in the cold. Eccentric state in the heating pipe, opposite its axis 11 offset upwards at a distance a; in the warm state, on the other hand, concentrically in the heating pipe. This is therefore the opposite of the construction according to the current state of the art. ,

In a further implementation of the concept of firing, the intermediate piece is secured against improper rotation from the position shown, for example by "" because the intermediate piece in its core is provided along its axis 22 with an angular guide slot 10 in which a connecting rod 12 fixed to the device is rectangular In the conventional construction, the connecting rod has the purpose of holding the individual elements of the radiator together, but it can also serve as a power supply line to the cable ends a blind flange passed through and provided with a clamping screw (not shown in the "drawing"). In the., innovation-like construction, the connecting rod is also, without any other special effort, the puncture to secure the intermediate pieces against improper rotation. This measure comes therefore of particular importance because the metals ne connecting rod 12 naturally has a greater thermal expansion than "the: ceramic radiator support 2, - 7 with the ceramic intermediate pieces 6, so that in the _; Operation especially on the planks 5.9 of the intermediate pieces a certain amount of slack is created. Also, the solder connection between the heating filaments, which lie between the projections of the connecting pieces (not shown in the drawing), result in: no protection against twisting of the intermediate pieces. This securing of the intermediate pieces: against adverse twisting purposes is .jedoch of decisive importance for. the subject of the innovation. This fuse is:. _; ;

measure guaranteed in a simple manner with the advantage of., relative displaceability of the intermediate pieces in a vertical .v direction with respect to the Yerkindungsstange 12 of each other. lined up * ^a conductor carrier and taking into account the diametrical thermal expansion of the heating pipe.

Beyond that, however, the danger increases the short circuit to the body and winding short circuit of the heating conductor spiral as a result of its slack is eliminated and at the same time a Even heat transfer to the heating tube is achieved.

-5

Claims (6)

Protection claims: 1. Heat-resistant spacer · for "mounting from the horizontal arranged, tubular, - ceramic heat conductor carriers in a metal hot ear, characterized in that ■ · the intermediate piece - (6) serving as spacers has projections (5, 9), of "those -'di'e directed downwards (9) have a greater radial length than. the upward dish- (5). ; . J. ~, ~ \. '' ··. -. · 2. Intermediate piece nach_Anspruch.1, 'characterized' in that the difference in length (a) between the ^ upper and "lower. Vor jumps is so dimensioned that - it, the sag (b) of the " corresponds to the heating conductor at operating temperature. * - 3. Intermediate piece according to claims 2-, and "3? Marked, by means (10, 12) which cause a rotation of the intermediate piece prevent in the heating pipe. '- 4. Intermediate piece according to claim 3> dadurch.gekisiert that as a means of securing against "twisting" a profile rod (12) is provided in a * recess (10) dos . Intermediate piece is performed '. . ^ - * / 5. Intermediate piece according to claims ^ · and "4, - characterized in that the profile bar" (12) is arranged centrally in the hot pipe. And the sections -. (»2, 7) of the Ileizleiterträgers and the intermediate pieces connecting them (6) cohesion. , "' ^: '." -, .- ·, 6. Intermediate piece according to the claims !. 4 and ". '5, characterized in that that the, profile rod (1,2) also serves as a conductor.