DE8705746U1 - Self-regulating heating device for pipe systems - Google Patents

Description

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Turk & Hillinger GmbH, 7200 Tuttlingen

Self-regulating heating device for pipe systems

The innovation concerns a self-regulating heating device, particularly suitable for heating pipes and pipe systems.

\ tion according to the preamble of claim 1.

For such heating devices, thermistors or so-called PTC elements are often used, which have the desired self-regulating effect. It is of crucial importance that good heat dissipation is created from the PTC element to the object to be heated so that this self-regulation also takes place in the desired sense. This good heat transfer should also be achievable with relatively little technical effort, not only in order to keep the manufacturing and assembly costs low, but also the space required by the heating device.

The aim of this innovation is therefore to create a heating device using PTC elements that ensures good, consistent heat transfer from the PTC element, even at changing temperatures, and that can be easily attached to the pipe to be heated.

This problem is solved by the characterizing features of protection claim 1.

This new type of heating device can be easily attached using the integrated clamping clamp, whereby the contact pressure on the pipe that can be achieved by this fastening element simultaneously also determines the pressure required for the heat transfer between

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The subject of the innovation is described below using an example of implementation and shown in the drawing. It shows

Figure 1 shows a cross section in plane I - I of the

Figure 2 and

Figure 2 shows a top view of the heating device mounted on a pipe.

The heating device essentially consists of two interlocking profile parts 1 and 2 made of aluminum or the like, _which together form a housing for the FTC elements (6), the trapezoidal inner and outer profiles of which form conical contact surfaces 3 and 4 with one _another . The inner profile part 2 has a recess 5 on its upper side which, in connection with the overlapping profile part 1, creates a cavity 15 for receiving two or more PTC elements (6) which are arranged between two contact plates 7 and 8, which in turn are connected to connecting cables 9 and 10 leading to the outside.

Contact plates 9 and 10 and the PTC elements between them (6) are covered with a thin insulating film 11 and are thus electrically insulated from the profile parts 1 and 2.

The underside of the inner profile part 2 is provided with a recess 11 that is approximately semicircular in cross section and corresponds to the pipe R to be heated.

The heating device is attached to the pipe R by means of a clamp 12 which extends over the latter and is screwed to the underside of the outer profile part 1 by means of screws 13.

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The dimensions of the two interlocking profile parts 1 and 2 are selected so that when the screws 13 of the clamp 12 are tightened, the two profile parts 1 and 2 are pressed firmly against one another with their conical contact surfaces 3 and 4 and are simultaneously clamped to the pipe R to be heated and that, on the other hand, a sufficiently high contact pressure is created between the PTC elements 6, the contact plates 7 and 8 and the profile dividers 1 and 2 enclosing these parts, which ensures the required good heat transfer from the PTG elements to the pipe R.

Practice has already shown that small, unavoidable tolerances in the dimensions of the components can be easily compensated by slight material deformations when tightening the clamping screws 13. A subsequent change in the contact pressure during thermal loading is practically insignificant, since thermal expansion is absorbed by the elastic part of the clamp.

Claims (3)

I &Ogr;« &Ggr; · U * ' , r- &Lgr;&bgr; ■ · ■ » J PROTECTION CLAIMS 1. Self-regulating heating device, in particular for pipe systems, in which one or more PTC elements supplied with electrical current via contact plates are arranged in a housing that is in heat-conducting connection with the pipe to be heated, characterized in that that the housing consists of two interlocking profile parts (1 and 2) made of aluminum, the trapezoidal inner and outer profiles of which enclose a cavity (15) which accommodates the PTC elements (6) including the associated contact plates (7,8) and which form conical contact surfaces (3,4) with one another with their cross sections, and that a clamp (12) screwed to the outer profile part (1) is provided which grips over the pipe (R) to be heated, which lies in a recess (11) in the inner profile part (2) adapted to the pipe diameter. 2. Heating device according to claim 1, characterized in that the upper side of the inner profile part (2) is provided with a recess (5) which forms part of the cavity (15) provided for receiving the PTC elements (6). 3. Heating device according to claims 1 and 2, characterized in that the PTC elements (6) including the contact plates (7, 8) are covered with a thin insulating film (14). tt ·*«· i ti i * I i it t * if if I t « ti itt t i it