DE1565329C - Heat-resistant intermediate piece for ceramic heating conductor supports - Google Patents

Description

Intermediate piece is provided in its core along its axis 22 with an angular guide slot 10, in which a device-fixed connecting rod 12 is guided with a rectangular cross-section. The connecting rod has the conventional design Purpose to hold the individual elements of the radiator together, but it can also be used as a Serve power supply to the heating coils. It is centric at the open head end of the heating pipe passed through a blind flange and provided with a clamping screw (in the drawing not shown). In the case of the present design, the connecting rod also comes without other special effort added the function, the spacers against inappropriate twisting to secure. This measure is of particular importance because the metal connecting rod 12 naturally has a greater thermal expansion than the ceramic radiator support 2, 7 with the ceramic spacers 6, so that especially on the flanks 5, 9 the intermediate pieces create a certain amount of slack. Also the soldered connection between the heating coils that lie between the projections of the connecting pieces. (not shown in the drawing) result

ίο no protection against twisting of the intermediate pieces. This securing is ensured in a simple manner with the advantage of relative displaceability of the intermediate pieces in the vertical direction with respect to the connecting rod 12 of the strung together Heat conductor carrier and taking into account the diametrical thermal expansion of the heating pipe.

1 sheet of drawings

Claims (6)

1 2 screw together with an end plate, which in turn is screwed concentrically to the patent claims: the open end of the heating pipe on a flange. Also are between the 1. Heat-resistant intermediate piece for holding individual heating conductor carriers, concentric, ceramic of horizontally arranged, tubular 5 see, disk-shaped support bodies known which gen, ceramic heating conductor carriers - whereupon the heating conductor spiral, however, only in the cold heating conductor is applied in a helical manner - keep it in a concentric position in the heating pipe. A metal heating pipe circular transverse The sag of the heating conductor spiral as a result of Section, characterized in that the effect of operational heating has an un- the intermediate piece (6) as a spacer that provides different heat distribution above and below Nenden projections (5, 9), of which the long lead to the heating tube. In addition, however, downward (9) a larger radial there is a risk that due to the sag of the Have a length than the ones facing upwards (5). · Heating conductor spiral body connection on the heating pipe and 2. Intermediate piece according to claim 1, characterized by interturn fault occurs in the heating conductor spiral, marked that the difference in length (a) between 15 special, if over time scaling see the upper and lower projections so occurred in the heating pipe is measured with deposition that it corresponds to the sag (b) of the scaled material at the endangered point, warm heating conductor. , 'at the bottom lengthways in the heating pipe. 3. Intermediate piece according to claim 1 or 2, the invention is based on the object characterized by means (10, 12) which add a 20 sag of the heating conductor in operation Compensate for twisting the spacer in the heating pipe. This object is achieved according to the invention prevent. solved in that the intermediate piece as a spacer 4. Intermediate piece according to claim 3, characterized by the holder serving projections, of which the characterized in that, as a means for securing, a greater radial length directed downwards gene rotation a profile rod (12) provided 25 than the upward. is, which exist in a recess (10) of the intermediate The advantages achieved by the invention Piece is performed. in the uniform heat transfer to the 5. Intermediate piece according to claim 3 or 4, heating pipe and, moreover, in the elimination of the characterized in that the profiled rod (12) is at risk of contact with the body and of a central winding is arranged in the heating tube and the 30 short circuit of the heating coil. Sections (2, 7) of the heat conductor carrier and which they The invention is in the following at a Ausverbindenden Intermediate pieces (6) holds together. management example explained on the basis of two figures. 6. Intermediate piece according to claim 4 or 5, It shows characterized in that the profile rod (12) Fig. 1 is an electrical heating tube in cross section serves as a conductor at the same time. 35 according to line I-I, with an axial plan view of a Zwi piece, F i g. 2 the same point of the heating pipe in a longitudinal section. · In a metal heating tube 1 with the axis 11 40 in a horizontal arrangement are eccentric, above the axis 11, ceramic, tubular heat conductor carriers 2, 7 with the axis 22. On the surface The invention relates to a ceramic intermediate the heat conductor carriers are grooves 8 in one piece in a spiral shape left for holding horizontally arranged ones in which heating coils 3 are embedded, tubular, ceramic heat conductor carriers in a 45 between the heat conductor carriers 2, 7 is a metal heating pipe. ceramic spacer 6 with side neck Electrical heating conductors, which protrude in spiral grooves on sets 4, which are wound into the tubular heating conductor supports 2, 7 tubular, ceramic supports and are in the middle between them, should be kept equally spaced in a metal heating pipe around cracks 5.9 in a radially symmetrical arrangement, especially if of 50 have. The downward projections 9 radiator is in operation. This requirement is in each case have a greater radial length than the upper projections S. The difference in length of the projections 9 fills in the previously known construction methods. Because according to the current state of the art up to 5, the heating conductor supports are dimensioned concentrically to the heating pipe conductor spiral in the hot state according to the sag b of the heating. The Zwigehaltert, a type of construction which, although in the case of disconnected pieces 6, with their lower projections 9 system, heat conductors store this in the heating pipe at the same distance on the lower inner wall of the heating pipe 1; holds, but not during operation, namely they support the heating conductor supports 2, 7 eccentrically, Hch due to the heat effect, a slack in the distance "above the heating pipe axis 11. It is a heating conductor, especially if the heating conductor therefore a = b, the maximum sag of the heating form of heating coils in a spiral on a 60 conductor spiral. This is so in the cold state the extra-ceramic carrier is wrapped. The axis of the heating tube, which is centered in the heating tube, relative to its axis 11, is thus shifted upwards as a result of the distance α; in the warm state of operational heat and therefore concentrically in the heating pipe. It is the speaking sag below the axis of the ■ the opposite of the construction according to the current heating pipe and the heating conductor carrier. 65 State of the art. It is known that in heating pipes a number of In one embodiment of the invention, the between Heat conductor carriers lined up axially to keep the piece against inappropriate twisting out of the and secured by means of a connecting rod and -Endver- position shown, e.g. by the fact that the