DE8229508U1 - ELECTRIC HEATING DEVICE - Google Patents

Description

Hanau / Main, October 12, 1982 ZPL-Zw / S

Heraeus-Wittmann GmbH, Hanau

Utility model registration

"Electric heater"

The invention relates to a device for heating a laboratory vessel according to the preamble of the main claim.

From DE-OS 28 44 040 a device is known that one Contains shape-changeable tubular heating element. With shape-changeable With tubular heating elements, local overheating cannot be ruled out because the spiral rests directly on the glass bulb. In addition, fatigue of the deformability is to be expected over the service life of the radiator. The weight of the The glass bulb must be completely connected to the radiator on genominen u / earth, so that this results in a change in the distance of the Spiral turns when inserting the piston results. This also results in uneven heating.

Alis of DE-OS 30 06 679 sin device is known with a Infrared heating coil rigidly arranged over a reflector A scarf-like one is used to hold a round kettle that is to be heated Support part provided with centering means

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is attached, in order to also with different carrier parts always an equal distance to the infrared heating loop result, This carrier part is made of glass or VzA steel. This increases the distance between the infrared heating coil and the glass bulb to be heated is enlarged in such a way that more heating energy has to be warmed up.

The object of the invention is to provide a device for heating To create laboratory vessels which guarantee a good and even heat transfer and which is dimensionally stable. In addition, it should be possible to easily install the heating device in a housing * If a glass bulb breaks, such splinter protection is required and a z. B, the liquid to be heated in the flask can be collected will.

An embodiment of the invention is shown purely schematically in the drawing.

Show it

Figure 1 shows an electrical heating device with a tubular heater, which is covered by the supporting body,

FIG. 2 electrical heating device in the form of a heating hood; Figure 3 electrical heating device in a housing.

In its simplest embodiment according to FIG. 1, the device consists of an electric tubular heating element in the form of a bendable radiator coil or spiral or some other type of spatial shape, being in the bendable metal jacket centrally the heating conductor wire is mineral-insulated by means of pressed powder. Such radiators are commercially available

The shape can, if desired, also be tubular or be coiled, meandered or wound differently, depending according to the shape of the vessel to be heated, in particular one chemical laboratories, such as flasks, beakers or funnels. Even simple flat patterns for partial areas or several patterns, even of different types, can be combined. In all versions, the tubular heater 1 is so tightly encased by a support body 2 that the desired shape, like flask * beaker, funnel, remains stable. The tubular heating element has electrical connection ends that lead to the outside 3 provided, which can be held together and mounted with a plate 4 or some other holding body.

The support body consists of a tightly fitting mesh-like fabric that fits closely to the tubular heating element, Knitted, braided, knitted, crocheted from glass fiber yarn or threads. Other vitreous or glass-ceramic materials in fiber or yarn form can also be used insofar as they can be processed in the procedures described. One edge, here that of the open side (Figure 1, above), of the support body is provided with a brim 5 or the like, to be flanged or otherwise held or carried and, as shown in Figure 2, by means of another insulating sheath 6 and / or, as shown in FIG. 3, from the housing 7.

In all three illustrated embodiments, the Provide the radiator with an opening in the central area at the lowest point of the hood or any other shaped base be, for example, for the passage of a pipe, a line, a shaft or the like.

Also, multiple tubular heater be included in einStn supporting body, to form, for example, a plurality jointly or independently controllable heating circuit e for defi each heated in a desired manner 2u region of the vessel.

Further modifications of the exemplary embodiments can be made will; without thereby entering the scope of the invention leave * This also includes all combinations and sub-combinations of the described, illustrated and claimed Features both among themselves and in the state of the art.

Claims (4)

Hanau / Main, October 12, 1982 ZPL-Zw / S Heraeus-Wittmann GmbH, Hanau Utility model registration "Electric heater" protection claims 1. Device for heating a laboratory vessel, in particular from Glass bulb or the like with an electric tubular heating element, characterized in that the tubular heating element with a fiberglass thread or thread taut and tight fitting is woven, knitted, braided, knitted, crocheted around like a mesh. 2. Apparatus according to claim 1, characterized in that on upper edge of the tubular heater a radiator-free piece of fiberglass fabric, geotric, braid, knitted fabric, Crochet is arranged in the form of a brim. 3. Apparatus according to claim 1 or 2, characterized in that that its base in a central area is free of radiators and made of glass fiber fabric, knitted fabric, braided fabric, knitted fabric, Crochet is made. 4. Apparatus according to claim 3, characterized in that the bottom has an opening in the central region.