DE19540004A1 - Radiant heater - Google Patents

Description

The invention relates to a radiant heater, such as. B. for heating hotplates or the oven Stove, for heating a shielded environmental, such as one Building room or the like. Is suitable.

The radiating from a heating field or a heating level Radiant heat emitted by a radiation emitter, first penetrates a free, gas or air filled Space and then essentially passes through one at the perimeter closed limited radiation output, for example through a radiation-permeable body, like a glass ramic plate. The inside of this plate is the heating vein ne with a parallel distance and limits the space face. A flat bowl-shaped body of the Hei zers, the pre-assembled unit with Pres solution can be attached to the inside of the plate, limits the space with the plate so that it essentially Chen closed or nearly free of flow openings is gastight. The room is then flat in the form of a disk free floor area of the base body, from which over the Floor area to the exit of the above circumferential limit and / or limited by the plate.  

If the heating field is circular, it can be from an external and inner perimeter limit, each of which up to the continuous contact on the inside of the plate sufficient and resiliently tight to this pressure-elastic can. The floor area and / or the perimeter limitation therefore consists of an insulation or insulation Substance which is essentially not for the radiant heat is permeable.

The bottom surface or a disk forming this can be divided lig from a pourable insulating material, such as a pyrogenic silica airgel exist, the binding, turbidity medium and / or fibrous or non-fibrous reinforcement or Reinforcing agents are added. This insulation material is then pressed dry or wet, so that it is a inherently dimensionally stable component. Possibly. can also the edge consist of such an insulating material or in one piece with be trained on the ground. However, the edge is preferably present made of an insulating material, which is compared to that of the Soil a higher dimensional stability or higher strength with regard to bending, compressive or tensile loads. On such material can be partially or largely a Fiber felt, a mica such as vermiculite or the like.

In the case of fiber felt or the like, the component is made from a wet stillage by sucking off the liquid in a mold First made as a moist cake, then if necessary through Cutting edges formed and finally at high temperatures dried. Here, too, turbidity or Binder admixed, but the binder in the Drying again by evaporation from the molded body can be removed. In the case of expanded mica or the like the pourable, also essentially from individual lots existing, raw material so dry in one  Form pressed to the shaped body that this similar to a Plastic part made of integral foam has a thin surface layer which is opposite the adjacent core is compressed much more. The floor could be too one of the materials described using the border or contain such materials. Bottom and edge can be made in one piece or form separate components, which are laid flat against each other for assembly and may be pressed against each other for sealing.

The basic body can in addition to the components mentioned or contain several components made of materials whose specified strengths higher than the limits of the Are space and for example made of metal or a rolled sheet material, such as sheet metal. On such component can on the outer periphery of the edge and / or lie against the outside of the floor and shield or support flat. This component can therefore by a Be formed sheet metal shell, on the edge of which connection or Control body for the electrical connection and for the Operating control of the heater can be attached so that they essentially only on the outside of the base body or lie outside the flat space.

In the area of the heating field or within it limited space is at least one working member for operation The heater provided different operating conditions occupies, namely stronger than the outer sides of the edge or Soil is exposed to temperature changes. Such an ar member is at least partially at a distance from the immit telbar adjacent peripheral surface of one or two edges or to the floor surface and is in contact with the plate free. Such a working element can be a heating resistor, in particular an elongated lamp body, the tempera  door sensor or the like. The temperature sensor can also form one of the basic body components mentioned, for. B. if the radiation emitter is only to be installed when the Temperature sensor is already installed. In the case of a lamp body this can be inside a tubular or for the Radiant heat permeable wrapping a coiled or elongated heating resistor, which by Spacers continuously at a distance from the inner circumference of the Cover kept and gas and pressure tight in the envelope trapped in an oxygen-free atmosphere, which can contain a protective gas such as halogen. For Evacuation forms the casing one or more tubular Mige connecting nipples, which over the outer circumference of the envelope project through which the protective gas is also filled and then, e.g. B. closed by fusion, pressure-tight will be.

There is a need for work members of the type mentioned against movements across the heating plane, especially in the beam direction, opposite the base body or the floor or Secure the edge non-positively and / or positively so that Impact loads, thermal expansions or the like. None Change of location takes place. Accordingly, one can Securing or centering parallel to the outside of the heating field and / or inside or across the central axis of the heating field be appropriate. Is such a safety or centering limbed by one of the basic body components mentioned Formed separately to be assembled component, it results a considerable assembly effort. Furthermore, the anchoring prepares tion, positioning and manufacture of this link which can lead to an increase in weight. Is the securing or centering member by a projection the envelope of the lamp body, for example the nipple,  formed, it is very fragile with increasing length sensitive and also difficult to assemble.

The invention is also based on the object To create radiant heaters or components thereof what disadvantages of known training or the described NEN type are avoided and the one in particular simple to secure and / or to assemble the position of the respective component allows.

According to the invention, means for securing the position of the respective towards the working member in two mutually perpendicular directions gene can be assembled together or a corresponding assembly Form ge assembly. The limbs, the one-piece or multi-part lig can be appropriately used for centering transverse to the central axis or for securing parallel to this Axis. The securing or centering members therefore form crosswise mutually lying stop surfaces for the to be secured Working member.

According to the invention, a securing and / or centering element can be used also a pre-assembled assembly with one or more of the form mentioned basic body components, so that this assembly as a whole with the other components of the heater can be assembled during assembly that both the securing member as well as the component essentially in the location required for operation. The part lige component z. B. the edge, the bottom and / or the Temperature sensor or a part of it. Each of these Components has sections which are circumferential around the Central axis an arc distance of at least from each other 45 °, 90 °, 120 °, 160 ° or more angular degrees and the same or have unequal distances from the central axis. It can also have several separate fuse links on the same  Component of the base body may be provided. The respective Securing member extends around the central axis to essential Lich less than the component.

According to the invention, the respective component of the Base body should be designed so that it before with him securing working member can be installed in the operating position, after which the working member is only used in its operating position and simultaneously or subsequently with the securing member is engaged.

Is the securing member by one of the associated component formed separate component, it is expedient partially embedded tightly enclosed in this component tet that the component in cross section to the securing member one or more outer peripheral surfaces closely or adherent surrounds. The securing member can also be made in one piece with the Component, e.g. B. be made of insulating material. In in both cases, the material of the securing member settles continuously into the inner or the core of this component in one piece. The securing member expediently has one Securing area for the engagement of the working member on and this securing area is advantageously at least partially towards the radiation exit adjacent to the heating level or floor area. The security area can be through a protrusion protruding from the floor surface or heating plane be formed of the insulating bottom, but is appropriate made of a different material than the floor surface.

Regardless of the training described, at least one of the components that the edge or the bottom of the resp form against the heating field room, with one of his described be provided with separate reinforcement, which a greater length than reinforcement fibers as a unit or has larger cross sections. The reinforcement consists of  a material whose strengths in the above sense larger than that of the rest and reaching to the surface the material of this component. The reinforcement is appropriately pre-assembled on the component before that each working member is used in the operating position. The Reinforcement can therefore be attached in a similar way to that of the Holding section of the respective securing member explained. The reinforcement expediently goes around the central axis or the like. over an arc angle that is larger than 30 ° or one of the above Arc angle is and also more than 270 ° or can be 300 °. The reinforcement can be used immediately adjacent support of the securing member may be provided and form with this a pre-assembled unit, which then in the manufacture of the associated basic body component les or thereafter connected to it in a fixed position.

The means for holding down or centering according to the invention Heating energy emitters can be very easily manufacture and assemble, with designs also conceivable are, in which in addition to the already provided and only components of the Base body no further links for securing or Centering required or to be assembled. This is e.g. B. the case when the securing means in one piece with a the insulating body and / or with the outermost jacket of the Temperature sensor is formed. Similar to the case of Arranged on the room floor, the securing member is appropriate even in front of the room if it is on a peripheral surface of the Circumference limitation is provided. This scope limitation defines one over most of its circumference Envelope surface and the fuse is above this envelope surface link radially outwards and / or inwards.  

These and other features are based on the claims the description and the drawings, the individual characteristics individually or in groups in the form of sub-combinations in one embodiment of the Invention and be realized in other fields and advantageous and protectable versions can provide for which protection is claimed here. Embodiments of the invention are in the drawings shown and are explained in more detail below. In the Show drawings

Fig. 1 a heater according to the invention in front and plan view at right angles to the heating plane against the radiation output,

Fig. 2 shows a detail of FIG. 1 on an enlarged axial section,

Fig. 3 shows a further heater in front view,

Fig. 4 shows a detail of Fig. 3 in an enlarged axial section,

Fig. 5 shows another embodiment in a depicting lung according to Fig. 4,

Fig. 6 shows a detail of a further heater in front view,

Fig. 7 shows a detail of FIG. 6 in an enlarged axial section,

Fig. 8 shows another embodiment in a depicting lung corresponding to FIG. 7,

Fig. 9 shows a detail of a further heater in front view,

Fig. 10 shows a detail of FIG. 9 on an enlarged axial section,

Fig. 11 shows a further embodiment in a depicting lung corresponding to FIG. 7,

Fig. 12 shows a further embodiment in axial section,

Fig. 13 is a locking member in a perspective view;

Fig. 14 is another locking member in perspektivi shear representation,

Fig. 15 shows a further embodiment in a depicting lung corresponding to FIG. 12,

Fig. 16 is another locking member in perspektivi shear representation,

Fig. 17 shows a further embodiment of a heater in a representation corresponding to Fig. 10,

Fig. 18 is a detail of a further form of execution of a heater in an axial section,

Fig. 19 shows the detail according to Fig. 18 in front view,

Fig. 20 shows a detail of a further heater,

Fig. 21 and Fig. 22 show two further embodiments in depicting settings corresponding to FIG. 20,

Fig. 23 the heater acc. Fig. 22, a perspective view of the inside radial

Fig. 24 shows a detail of a further heater in front view,

Fig. 25 of the detail according to Fig. 24, in axial section,

Fig. 26 shows a detail of a further heater in front view,

Fig. 27 is an axial section through the detail according to Fig. 26,

Fig. 28 shows a further embodiment in a depicting lung corresponding to FIG. 27,

Fig. 29 shows a further embodiment in a depicting lung corresponding to FIG. 26,

Fig. 30 is an enlarged axial section through Fig. 29,

Fig. 31 shows a further embodiment in a depicting lung corresponding to FIG. 23,

Fig. 32 the associated securing member in perspective view and

Fig. 33, the embodiment according to FIGS. 31 and 32 in a representation corresponding to Fig. 22.

The flat disc-like heater 1 has a shell-shaped base body 2 made of several one-piece components, namely a disc-shaped base 3 , annular or circular closed edges 4 , 5 , an outer, thin-walled shell 8 made of sheet metal or the like and a temperature limiter or temperature sensor 9 on, which can form a pre-assembled unit. Bottom and edge 3 , 4 , 5 can each consist of one of the different insulating materials mentioned and / or a mixture thereof. The thermal insulation value of the floor material is expediently higher than that of the edge material, the strength of which is in turn higher than that of the floor. The components 3 to 5 and 8 extend symmetrically about a central or central axis 10 . The outer edge 4 lies with its outer circumference continuously on the inner circumference of an edge of the shell 8 , through which the outer circumference of the base 3 is also centered, possibly with a small gap distance. The component 8 , which can also be formed only by a bottom or an edge, is used for the outer shielding and the stiffening of the components made of insulating material.

Between the edges 4 , 5 a ring-shaped or continuous to the axis 10 heating field 11 is formed, which adjoins the inner circumferential boundary 14 of the edge 4 and the outer circumferential boundary 15 of the edge 5 lying coaxially therein or to the axis 10 . An unheated middle zone 18 lying inside and / or outside the boundary 15 can be formed about the axis 10 . Each boundary 14 , 15 defines an envelope surface 19 , which is only indicated by the edge 4 and here is approximately cylindrical and / or conically widened at an acute angle to the outside.

Within the heating field 11 completely exposed and with a smaller radial distance from the boundary 14 than from the boundary 15 , an emitter 20 for infrared heating radiation is arranged in a fixed position about the axis 10 . The emitter 20 is formed by a rod-shaped or tubular halogen lamp which contains a coaxially located, coiled heating resistor 22 in a protective gas filling within an elongated, rod-shaped or tube-shaped housing 23 . The opposing stand 22 is kept free of contact from the inner surface of the housing 23 with spacers 24 spaced apart. The parts 20 , 22 , 23 , 24 are arranged in a ring coaxially to the axis 10 and form a heating section 25 which extends over an arc angle of at least 180 to approximately 360 ° and lies continuously in a plane perpendicular to the axis 10 . This plane can define the heating plane 13 of the heater 1 in the form of the central plane, the rear plane or the front plane of the emitter 20 , which can also be defined radially inside and / or outside the emitter 20 by the front, central plane of the floor 3 .

The ends of the housing 23 bent from a rod-shaped blank are curved radially outwards, penetrate the components 3 , 4 , 8 and serve as electrical connection sections. The resistance wire 22 is not coiled in its area, so that at most less or no heating radiation is emitted. Instead of the emitter 20 or additionally, a bare or exposed Heizwi resistance with essentially the same properties or the same design and arrangement can be provided, for example, a resistor made of a flat ribbon, which is anchored and held in the bottom 3 , and instead of Has a tight curl. Such a wide emitter can be provided at a radial distance inside and / or outside the emitter 20 , the radial distance from the boundary 14 appropriately corresponds approximately to its diameter or at most two or three times it.

With a radial spacing of this order of magnitude, the base 3 forms a front, flat base surface 27 within the emitter 20 , which is located between the end planes of the emitter 20 closer to the rear end plane. With a corresponding or smaller radial distance, the base 3 outside of the emitter 20 forms a flat, annular end face which is offset in relation to the front and which is flat between the mentioned front ends, in particular in the heating plane 13 . The inner circumference adjoining this end face, which is widened conically at an acute angle, forms the boundary 14 with the inner circumference of the edge 4 and can be offset radially inwards relative to the edge 4 and / or radially outwards relative to the outer circumference of the emitter 20 . On this end face lies with the rear, flat end face 28 of the full surface 4 , whose front, flat end face 29 is offset from the edge of the shell 8 to the front and lies in the plane 32 perpendicular to the axis 10 . During assembly, the heater 1 is placed with this end face 29 in a substantially gas-tight or pressure-tight manner against the inside 33 of a cover or plate 30 with pressure and fixed in position, which consists of a material which is permeable to the heating radiation, such as glass ceramic. The inner circumference of the end face 29 or its meeting with the enveloping surface 19 defines the outlet 31 lying in the plane 32 for the heating radiation. The end face of the edge 5 , like the edge 4, can extend to the plane 32 or be set back in relation to it, but projects beyond the bottom surface 27 . In its area, the thickness of the base 3 is at most as large or smaller than the distance between the plane 32 and the surface 27 or the plane 13 .

The radiant heat is emitted from the emitter 20 at right angles to the plane 13 in the main radiation direction 34 , but also across all areas obliquely to the plane 13 through the outlet 31 and the plate 30 , so that it has the greatest effect in the area of the emitter 20 and the radiation density up to the limit 14 has a lower gradient than up to the axis 10 . The outside of the plate 30 , on which a plurality of heaters 1 can be arranged at a distance from one another, serves as a horizontal cooking surface of a cooker, on which cooking vessels to be heated can be placed in alignment with the respective heater 1 .

For play-free and / or slight axial or radial play securing the position of the emitter with respect to at least one of components 3 to 5 , 8 and 9 , securing and centering means 35 , 36 are provided, each of which has at least one securing or centering member 37 , 38 for contain the system on the outer circumference of the emitter 20 which extends along its longitudinal central axis or is convexly curved about this axis. Here, the system is provided directly on the about the axis 10 and the longitudinal axis of the emitter 20 curved outer periphery of the housing 23, and not transverse to extending therefrom approaches, such as evacuating or filling for the housing 23, although such an embodiment is also conceivable. Links 37 , 38 are located at least partially or exclusively on that side of an axial plane of the axis 10 which is remote from the connection sections 26 . This plane can lie at right angles to that axial plane which lies between the sections 26 . Only two links 37 and 38 are provided symmetrically on both sides of this axial plane, which are at an arc distance of at most 150 ° and at least 45 °, in particular approximately 90 ° from one another.

Two links 37 , 38 each form a preassembled unit with one another and with one of the edges 4 . The two links 37 , 38 each lie in the same peripheral region of the emitter 20 or in a common axial plane of the axis 10 . The securing member 37 made of heat-resistant material, such as steel, serves to hold the emitter 20 positively but resiliently against the front of the base 3 , on which the emitter 20 is locally limited or punctiform with the outer circumference of the housing 23 can fit without play. The member 37 is U-shaped from round wire bent so that its parallel legs 39 protrude with their free ends directed radially outward beyond the outer circumference of the emitter 20 and the curved U-crosspiece lies radially within the inner circumference of the emitter 20 . The leg and crosspiece lie continuously in a common plane parallel to and at a distance from the plane 13, 32 in the front end plane of the emitter 20 . With a radial distance from the outer circumference of the emitter 20 , the legs of the link 37 form a flat holding section 39 which is completely embedded or pressed into the edge 4 during its manufacture, so that all its surfaces are closely enclosed by the edge material and the holding section 39 is closer to the end face 28 than to the end face 29 .

Outside or radially within the edge material, the link 37 forms a securing section which is also continuous in the plane mentioned and which, at the front end face of the housing 23, abuts with each leg only at a single contact point 41 in the form of a point or line, possibly under pretension . Two contact points 41 which are immediately adjacent in the circumferential direction with a small spacing are thus provided for each securing point. This results in only a very small heat transfer from the emitter 20 to the member 37 , the contact-free and embedded sections te serve to dissipate heat from the contact points 41 , the legs being mutually continuously contact-free. The fuse assembly 4 , 7 , 38 is to be mounted against direction 34 .

Each securing point forms at least one of the parts 4 , 37 , 38 with an additional member or a reinforcement 40 a pre-assembled unit, which before or after the correct arrangement of at least one emitter 20 on this unit and / or on the floor 3 on the rest of the base body 2 is to be assembled. A corresponding unit can also form parts 3 , 4 , 8 , 37 , 38 , 40 in any combination. The reinforcement 40 is formed by an inherently stiff, curved and one-part or at most five-part strand section, such as a wire. This passes about the axis 10 continuously approximately as far, as explained with reference to the heating section 25 , so that its ends are at a distance from one another, namely in the front view they do not extend into the areas of the connecting sections 26 or the sensor 9 .

The reinforcement 40 is continuous in a plane parallel to the plane 13, 32 with a distance between the distance between the planes 28, 29 and between the circumferential surfaces of the edge 4 , being approximately in the middle between these circumferential surfaces and closer to the end face 28 than at the end face 29 and on the side of the link 37 facing this. In the front view, the reinforcement 40 crosses the holding section 39 , which projects radially outwards and inwards over the reinforcement 40 , but not over the outer peripheral surface of the edge 4 facing away from the envelope surface 19 , relative to which the parts 37 , 40 are set back. The reinforcement 40 is therefore tangential to the legs 39 at two points and is form-fitting or adhesive at these points, eg. B. attached by wrapping, welding or the like. The link 37 or the section 39 forms a preassembled unit with the link 40 prior to attachment to the associated component 4 or prior to its manufacture. This applies to all existing links 37 . In the manufacture of the edge 4 in a mold, the above-mentioned links are directed towards the inner surfaces of this mold in a contact-free manner in that the later freely projecting sections of the links 37 are fixed in a correspondingly aligned manner outside the molding space. The links 37 , 40 can consist of the same or similar materials and / or have the same material cross sections.

As the members 37 and the holding portions 39 is also the respective centering member 38 to the emitter 20 radially above the associated limit 14 or the area of the envelope surface 19, which lies between the end faces 28, 29 and the planes 13, 32nd The link 38 consists of an insulating material which, like the other insulating materials, can serve for thermal insulation, electrical insulation and also insulation against the heating radiation. The link 38 , like the links 37 , 39, extends around the axis 10 over an arc angle of less than 20 ° or 10 °, but takes up a slightly larger arc angle compared to the link 37 , 39 and lies symmetrically to the central plane between the legs 39 or the lateral outer edges of the link 37 formed thereby. The link 38 is formed in one piece with the associated component 4 , extends to the boundary 14 and projects beyond it as a projection which can extend from the end face 28 to the end face 29 . On the front side on both sides of the link 37 , the projection 38 protrudes radially furthest, so that the holding section 39 is also completely embedded in it.

Adjacent to or from the front end face of the link 37 , the end face of the projection 38 can approach the envelope surface 19 or the boundary 14 obliquely in the direction 34 , so that it does not further obstruct the beam path in this area, but rather the exit 31 in this area Range extends to the envelope surface 19 . The surface of the emitter 20 facing the outer ring circumference of the limb 38 which is widened to the limit 14 lies in a small radial gap distance directly adjacent to the outer circumference of the housing 23 in a plane which is approximately perpendicular to the plane 13, 32 and extends to the plane 13 . This projection surface forms a stop for the emitter 20 when it executes radially directed movements against the member 38 . The associated or inner circumferential boundary of the end face of the base 3 supporting the edge 4 lies in axial section with the respective distance between the stop surface and the boundary 14 , so that the projection 38 reaching as far as the end face 28 is also pressed against the base 3 , when the heater 1 is pressed against the plate 30 .

The bottom 43 of the component 8 can, like the rear end face of the bottom 3 in the radially outer, at the shell edge 42 at the closing area, form a staggered ring zone for supporting the rear end face of the bottom 3 in the area of the edge 4 , while the bottom 3 radially inside this ring zone lies continuously with a gap distance from the bottom 43 . As a result, after the heater 1 has been mounted on the plate 30, the embedding region of the component 4 and the member 28 are under axial compressive stress, by means of which the embedding of the members 37 , 40 and the member 38 are solidified. Due to the pressure-elastic properties of the insulating material, the member 38 is radial spring back within a limited range. The contact of the emitter 20 on the link 38 is likewise only provided in the form of points or lines.

The attachment of the connecting sections 26 to the base body 2 also forms securing or centering means, the connecting sections being sealed between the abutting and provided with corresponding grooves end faces 28 can be guided to the outside in such a way that they form-fit in the axial and / or circumferential direction or backlash-free against the components 3 , 4 are secured in position, while they are secured in their longitudinal direction by friction against the components 3 , 4 . The connecting sections 26 penetrate the edge 42 in the region of one through opening without contact.

Correspondingly, the rod-shaped temperature sensor 9 also penetrates the edge 42 in the area of a passage opening and only closely fits the edge 4 . The central longitudinal axis of the sensor 9 can intersect the axis 10 at right angles. The straight-line sensor 9 is located at a constant distance from and between the planes 13, 32 and at a distance from the front end face of the emitter 20 and parallel to the plane 13, 32 . It extends from the boundary 14 slightly beyond the axis 10 , crosses the heating section 25 in a front view, with its outer circumference under tension on the front end face of the one-piece with the bottom 3 formed edge 5 and only slightly protrudes with its free end the limit 15 beyond. The sensor 9 is expediently designed as a strain sensor, which has two longitudinal sections with different thermal expansion sections, for. B. an outer tube and a longitudinally arranged in this inner rod, each of which may have the smaller expansion coefficient. Correspondingly, the outer tube or the inner rod can be made of metal or a ceramic material, such as quartz glass, and can be subjected to tension or pressure during operation. One of the two longitudinal sections is secured in the longitudinal direction in a form-locking manner on the housing of a base 44 , which in turn is completely attached to the component 8 on the outside of the edge 42 lying between the bottom 43 and the plane 32 . The other longitudinal section actuates one or more switches arranged within the base housing, via which the emitter 20 is partially or completely switched off above a limit temperature.

In the circumferential direction, immediately adjacent to the base 44, there are connection bodies 46 radially outside the edge 42 , which are firmly connected to the connection sections 26 and can also be secured in position on the component 8 . On the side of the connector body 46 facing away from the base 44 , a further, separate connector body 45 made of hard ceramic is fastened by plugging in at the edge 42 , which, like the base 44 , is wired to the connector bodies 46 by lines which are encased by insulation. The resistor 22 is thereby connected in series with the connecting bodies 44 , 45 , which in turn are used to connect the heater 1 to two operating or device feed lines via which the heater 1 can be switched on manually or switched to different operating powers .

In the embodiment according to FIGS . 3 and 4, two coaxial heating fields 11 , 12 are provided, of which the outer and / or inner is delimited in a ring; the inner heating field 12 can also pass through to the axis 10 . The two heating fields 11 , 12 are separated from one another by the edge 5 , which forms a preassembled unit with the edge 4 and the securing and centering means 35 , 36 for two emitters 20 , 21 and with separate reinforcements 40 for both edges 4 , 5 . Each heating field 11 , 12 is a separate or separately switchable emitter 20 , 21 , z. B. assigned a lamp of the type described. The inner circumference of the inner edge 5 here forms the outer circumferential boundary 16 of the inner field 12 , to which the associated emitter 21 can reach approximately with its outer ring circumference for centering over the circumference. In Fig. 4, the enveloping surfaces 19 are also drawn for the limits 15 , 16 . The convex boundary 15 is tapered towards the front at an acute angle and the concave boundary 16 is correspondingly widened. The taper of the boundary 16 is only provided from the level 13 to the level 32 , while the taper of the boundary 15 can pass through to the end face 28 . Both emitters 20 , 21 lie in the same plane 13 , with respect to which the common plane of the end faces 28 of both edges 4 , 5 is offset to the rear, but lies in front of the rear end plane of the emitters 20 , 21 . The connection sections 26 of the inner emitter 21 , like the connection bodies 26, lie between the connection sections or connection bodies of the outer emitter 20 and between the connection bodies 44 , 46 there is the connection body 45 , to which all the emitters 20 , 21 are wired.

In the front view according to FIG. 1, spacers or centering members 38 are not approximately square, but are elongated in the circumferential direction, their front sides reaching at most the plane 13 and passing into the associated boundary 14 , 15 via a recessed corner. A cylindrical peripheral surface adjoining the boundary 16 towards the rear forms the centering member over the entire circumference for the outer ring circumference of the emitter 21 and is penetrated by its connecting ends or the associated grooves. The links 38 can also be provided for the abutment of the inner or concave ring circumference of the respective emitter 20 and diametrically opposite the respective link 38 for the outer ring circumference. The number of provided for the same longitudinal or ring side of the emitter 20 centering members 38 is greater than the number of hedging members 37 , namely twice as large. The additional centering members 38, which are not covered by securing members 37 , each lie approximately in the middle between the adjacent securing member 37 and the associated connecting ends 26 . Furthermore, the centering members 38 are completely set back towards the level of the securing members 37 .

The securing members 37 , which can also be attached by piercing or piercing after the edge 4 or 5 has been produced, penetrate both delimitations 15 , 16 of the edge 5 and are attached to the edge 4 in the manner described. Also in the edge 5 is a reinforcement 40 , as described with reference to FIG. 1 ben, which forms a preassembled structural unit with the reinforcement 40 of the edge 4 and the links 37 or the holding sections 48 , the holding sections 48 of which are described in the manner described can also be embedded in the edge 5 during manufacture. The two edges 4 , 5 can be made simultaneously or one after the other and connected to this unit and then belong to the genann th assembly unit.

To the assembly unit made of wire or the like. Also include fasteners, such as U-shaped brackets, the crossbars on both sides of the reinforcement 40 of the edge 5 on the plane 32 facing side of the legs of the Halteab section 48 abut and their U-legs on the end face 28 of the edge 5 are accessible or protrude from this end face. The legs of the clamps 47 form parallel protruding lancing tips parallel to the axis 10 , which are pierced when the edge 4 , 5 is placed in the base 3 and thereby secure the assembly unit mentioned without friction against the plate 30 relative to the base 3 . All other areas of the fastening clips 47 are completely embedded in the edge 5 . The hedging leg of the securing member 37 bridges the heating field 11 or the annular space between the boundaries 14 , 15 continuously and protrude beyond the boundary 16 as illustrated by the boundary 14 according to FIG. 1. You do not enforce the centering members 38 .

In Fig. 5, an embodiment is shown without fasteners 47, wherein the reinforcement 40 of the rim 5 is integral with the corresponding holding section 48 in the manner described here. All of the mentioned sections of the securing member 37 lie in a common plane. According to FIG. 3, the sensor 9 passes through the edge 4 or 5 at positions opposite one another, so that its free end can also pass through the edge 42 . The sensor 9 is angularly offset with respect to the links 37 , 38 , but with respect to the adjacent link 37 , 38 by an angle several times smaller than the arc distance between adjacent links 37 , 38 . The sensor 9 lies between the reinforcement 40 and the level 32 , so that it can also cross the reinforcements 40 in a front view. As shown in FIGS. 1 to 5, the legs 39 of each securing member 37 10 facing ends are integrally connected to each other at the axis, there are in the case of the embodiments according to FIGS. 6 to 8 and 11, their side facing away from the axle 10 ends. Referring to FIG. 7, the respective locking member 37 forms a prefabricated assembly unit only with the edge 5, but not having the edge 4, which no reinforcement 40 and in which the hedging member 37 is not engaged, but ends at a distance from its boundary fourteenth According to FIG. 6, however, the edge 4 can also have a reinforcement 40 and form a prefabricated assembly unit with it.

According to FIG. 8, the securing member 37 also engages in the edge 4 with a holding section 48 containing the U-cross bar, but without this having a reinforcement 40 . FIG. 11 is also provided in the edge 4, a reinforcement 40 to which the holding portion 48 immediately adjacent to the U-transverse web is attached. A single securing element 37 thus serves to hold down two or all emitters 20 , 22 in the region of the contact points 41 . For a ring circumference of an emitter, e.g. B. the inner periphery of the emitter 21 can also form the bottom 3 centering members 38 of the type described. The base surface 27 is adjoined by an acute or obtuse angle or 90 ° conical, convex outer circumference as a boundary 17 , which in the manner described can have the centering members 38 as projections which extend over the associated envelope surface 19 of this boundary 17 and / or that zone protrude from the bottom surface of the bottom 3 , which lies in the area of the emitter 20 or 21 .

Referring to FIGS. 9 and 10, a securing member 37 and a corresponding centering member are each formed with each other as well as the corresponding edge 4 in one piece 38, wherein z. B. four such arrangements can be provided evenly distributed over the circumference or a securing and centering member 37 , 38 in the area between the connecting ends 26 . Each of these links 37 , 38 forms a radially web-like projection projecting beyond the boundary 14 , which, with its radially inner end, connects to a base plate 49 in a load-bearing manner and can be formed in one piece therewith. This bottom plate 49 completely covers the radially inner central zone of the bottom 3 with a thermally insulating gap distance and forms the bottom surface 27 lying approximately in the plane 13 .

At its rear edge surface of the projection or the end face 28 is penetrated by a transverse groove whose bottom surface forms the securing member 37, while both groove flanks 38 form the centering 38th The back of the bottom plate 49 lies approximately in the plane of the end face 28 , which is set back like this back relative to the plane 13 . The bottom surface 27 can also be offset from the plane 13 by less than half the axial extent of the emitter 20 . The bottom plate 49 is circular about the axis 10 and the projections 37 , 38 are elongated in the radial direction in the manner transverse to the plane 13 or 32 standing plates, so that their front edge surfaces lie approximately continuously in the plane 32 . Only the inner ends of these projections 37 , 38 connect to the plate 27 , which they can carry freely suspended, possibly with individual punctual supports relative to the bottom 3 .

The securing member 37 according to FIGS. 12 and 13 is on the outside of the edge 42 with a partially annular Halteab section 48 attached to a tab which is bent out of the edge 42 and engages in the interior of the Halteab section 48 . This lies flat against the edge 42 and is angled at an acute angle to the legs 39 , which penetrate narrowly defined openings in the edge 42 and diverge at an acute angle to their free ends. The legs 39 converge at an acute angle with the plane 13 to the axis 10 , so that the contact point 41 not according to FIGS. 1 to 11 on the circumferential zone of the emitter 20 closest to the plane 32 , but in contrast slightly to the side towards the axis 10 of the emitter 20 is offset. As a result, a centering force acts on the emitter 20 transverse to the axis 10 . The wire of the link 37 is polygonal in cross-section, in particular elongated rectangular, the largest cross-section extending transversely to the plane 13, 32 .

Referring to FIG. 14, the only two-leg angled, in axial section member 37 at a distance of and between the retention portion 48 and the emitter 21 relative to the Grundkör per 2, particularly the bottom surface 27, lying loosely supported. For this purpose, the legs 39 , which are otherwise spaced from the floor 3 , have correspondingly bent-out, U-shaped longitudinal sections, the U legs of which simultaneously serve as centering members 38 for the emitter 21 .

Referring to FIGS. 15 and 16, the legs of which form the transverse groove 38 accordingly as shown in FIG. 10 curved centering members 38. The holding section 48 is U-shaped in the axial section, one U-leg forming the links 37 , 38 and the other engaging in a surface of the floor 3 facing away from the floor surface 27 between the latter and the floor 43 . This surface is formed by a pocket-shaped depression on the back of the bottom 3 . The also two-legged U-transverse web is inserted snugly between the outer circumference of the bottom 3 and the inner circumference of the edge 42 , so that the link 37 is secured almost free of play both parallel and at right angles to the axis 10 and by radial insertion into a preassembled unit with the bottom 3 can be connected. The front U-leg can pass through the offset base edge in an area set back relative to the end face 28 , e.g. B. in the region of a groove or a bore-like through opening.

According to Fig. 17 part of the basic body 2 or one of the insulating body, as the bottom 3, a further component 7 of said insulating materials, which is different from that of the base material, in particular solid is made of a. The component 7 can be a prefabricated body, which is then formed during the manufacture of the base 3 by means of embedding, which extends only approximately over the arc angle explained with the aid of the link 38 and up to at least one of the end faces of the base 3 is enough or enforces this. Gradation or changing width of the outer circumference results in an axial positive locking of the component 7 , in particular special against movements in the direction 34th The part 7 can protrude slightly from the front bottom surface and thus serve as a contact for the rear end surface of the emitter 20 , which is kept free of contact with the rest of the front bottom surface. The part 7 forms a securing carrier for the link 37 , which, as in the case of the embodiments according to FIGS. 1 to 8 and 11, during the manufacture of the carrier 7 by pouring in against movements in all directions with the carrier 7 and after manufacture the bottom 3 is connected to this. The longer leg of the angled member 37 protrudes from the front end face of the polygonal and / or circular support 7 in axial view and can then be bent to form the fuse against the axis 10 around the outer circumference of the emitter 20 over more than 90 °. By bending back, the emitter 20 can also be released again, as is also possible with a resilient design according to FIGS. 1 to 8 and 12 to 16 without permanent deformation of the link 37 or 38 . The carrier 7 consists in particular of compressed expanded mica. It can also be inserted from the rear side into a correspondingly prefabricated or stepped bottom opening after the manufacture of the base 3 so as to be stop-limited and thereby assembled. By contacting the floor 43 , the carrier 7 is then positively secured relative to the floor 3 .

According to FIGS. 18 and 19, the holding section 48 passes through the opening 50, which is elongated in the longitudinal direction to the axis 10, for the most part without contact, and the link 37 is secured against movement in the direction 34 by contacting its rear end, which is angled transversely to the axis 10 . The elongated hole 50 is so large that the entire link 37 , 48 can be pre-bent and then inserted from the rear bottom side. The link 37 is curved and lies with the convex side of the curvature on the emitter 20 . The holding portion 48 could also extend through the floor 43 and held approximately free from play between the bottoms 3, abut 43 at the outside of the bottom 43, z. B. with a crossed end of the Halteab section 48 . The opening 50 remains open and is covered by the bottom 43 .

The emitter 20 has one or more projections 51 which protrude radially over the outer circumference of the housing 23 and which are formed in one piece with the housing 23 and are in particular tubular or nipple-shaped with an outer width which is substantially smaller than that of the housing 23 . Before jump 51 , the inside of which is connected to the inside of the housing 23 and which is pressure-tightly closed at the free end by fusion or the like. Can be used to evacuate the housing 23 and to fill it with protective gas in the manufacture of the emitter 20 . This over the rear end of the emitter 20 at right angles to the plane 13 projecting projection 51 engages in an or the opening 50 of the base 3 that it acts as a centering member as explained by means of the members 38 and also has a positive fit against rotational movements about the axis 10 backs up.

Referring to FIG. 20, the two are integral with each other being formed locking leg 39 of the member 37 about the axis 10 through an arc distance of more than 45 ° and less than 90 ° from one another. The securing legs pass through openings or grooves in the front end face of the outer, pre-set ring edge step of the bottom 3 or the edge 4th The transverse web of the holding section can be sunk in corresponding openings in the outer circumference of the base 3 or the edge 4 , while its rear leg can lie in a recess on the rear of the base 3 or the edge 4 , as shown in FIG. 15. This leg or another section of the securing component can also form the spacer according to FIG. 17 which bears against the back of the emitter 20 and which then consists of metal or wire. The reinforcement 40 or the like is arranged in accordance with FIG. 20 in the bottom 3 in the manner described completely embedded and lies in an axial view with a radial distance from the boundary 14 and from the adjacent ring circumference of the emitter 20 . The reinforcement 40 can serve to solidify the holding section of the securing member 37 .

Referring to FIG. 21 is the rear leg of the holding portion 48 in axial view a V-shape with the axis 10 away diverging legs which merge into the transverse web, and then in securing leg 39.

Referring to FIGS. 22 and 23, the holding portion is curved in axial about the axis 10 and 48 it lies closely against the inside of the rim 42 as well as on the outer periphery of the rim 4. The sheet metal tabs for fixing the position of the holding section 48 are not bent outwards as in FIG. 12, but inwards from the edge 42 against the bottom 43 , so that the holding section 48 can be positively connected to them by insertion in the direction 34 . The hedging and centering members 37 , 38 are similar to Fig. 14 from the holding portion 48 freely. In particular in the embodiment forms according to FIGS. 12 to 23, only a single component can be sufficient as a securing or centering member 37 , 38 , which is expediently diametrically opposed to the connecting sections 26 .

Referring to FIGS. 24 and 25, the securing and centering membered 37, 38 according to FIGS. 9 and 10 integrally formed with the edge 4, but without the base disc 49 is provided. The hold-down and centering surface 37 of the projection 38 extends around the longitudinal axis of the outer circumference of the emitter 20 not according to FIG. 10 over more than 180 °, but over less than 90 °, so that the circumferential zone closest to the plane 32 Emitters 20 remains exposed. The edge 4 can be made transversely and / or parallel to the axis 10 from two or more closely adjacent edge or ring layers made of different insulating materials. The edge 4 forming the projections 38 expediently consists of a mixture of the aforementioned expanded mica and the aforementioned fiber felt melange and / or the non-fibrous, pourable insulating material, each of the remaining insulating components also being made of such a material, possibly in different ways Mixing ratio, can exist. At the front end of the edge 4 is a much thinner, washer-shaped edge portion 6 is created, which forms the end face 29 and from a stronger than the edge 4 Isolierma material, z. B. expanded mica, fiber felt or the like. By attaching the heater 1 to the plate 30 , the ring parts 4 , 6 of the insulating edge are axially pressed against each other and secured against each other and against the floor 3 .

Referring to FIGS. 26 and 27, the member may be 37 and 38 also form a preassembled unit with the probe 9 and the outer tube and / or be integral with this outer pipe. The outer circumference of the outer tube lies on the contact point 41 or on two contact points 41 lying on both sides of the axis 10 on the emitter 20 and thereby secures the latter against lifting off from the bottom 3 . At least one clamp 47 is fastened to the side of the sensor tube, the clamp legs or prongs lying transversely to the plane 13 and being able to be inserted into the base 3 . At least one bracket leg forms the centering member 38 , which can lie tangentially or punctiformly on the inner and / or outer ring circumference of the emitter 20 . Instead or in addition, the projection 51 can also be used for centering, so that a clamp 47 is not absolutely necessary. The bracket 47 is permanently fixed with welds on the weldable sensor tube.

In Fig. 26 brackets 47 are provided separately and arcuately spaced from the sensor. 9 A bracket 47 bears against the rear end face of the emitter 20 and thus serves to keep the emitter 20 at a distance from the base 3 . The other bracket 47 surrounds the emitter 20 closely at the front half of its housing circumference so that it is used for centering and holding down independently of the sensor 9 . In the associated with the contact point 41 and on both sides protruding longitudinally rich, the difference between the thermal expansion coefficient of the two sensor rods is expediently much smaller than in the other areas or there is no such difference, so that in the area of the contact point 41 through the heat transfer from the emitter 20 to the sensor 9 whose switching point is not falsified. The temperature-compensated longitudinal section can extend to the free end of the sensor 9 and z. B. be formed in that the area of the inner rod consists of material of the same thermal expansion as the outer tube.

Referring to FIG. 28, the securing or centering member 37 also forms a preassembled unit with the probe 9, however, it is formed by a separate component, which has a rod-shaped extension of the free end of the probe forms. This elongated securing member 37 , which has approximately the same outer and / or inner cross-sections as the sensor 9 or its outer tube, is axially attached with an open end to the tapered, free end of the sensor 9 and thereby secured. The sensor 9 is short here according to FIG. 1, so that it only extends over part of the width of the heating field 11 . Since the free end of the link 37 forming a rigid unit with the sensor 9 is supported or penetrates the edge 42 , it serves to secure the position of the free sensor end without effectively influencing the sensor 9's sensor result by heat conduction. Only the link 37 abuts the contact point 41 on the emitter 20 . On the other side of the axis 10 , the outer tube of the sensor 9 can rest on a corresponding contact point. The free end of the overtube or member 37 can also be secured axially against pulling away from the sensor 9 by a sheet metal tab of the edge 42 . Furthermore, a link 38 or 47 can be provided on link 37 according to FIG. 27.

According to FIGS. 31 to 33, the securing member 37 bent from wire has a U-shaped bent section 48 with straight legs and straight transverse web. The transverse web can stand on the raised shoulder between the recessed floor area and the edge 42 immediately adjacent to it, or can be at a distance above it. The legs and / or the crossbar of the holding section can rest directly on the inside and / or the outside of the edge 42 . This edge 42 is firmly connected to tab-shaped fixing parts 52 , which here are formed in one piece with the edge as tabs or the like and have the same material thickness as the edge 42 . On both sides of each tab 52 , it is separated from the rest of the edge 42 by two laterally flanking slots 54 , 55 so that its front or upper end projects freely and only the other end connects to the edge 42 as a connecting foot. A slot 54 forms an angled intermediate section, and the other slot 55 , in particular the slot facing the second tab 52 , is straight. As a result, only the free ends of the tabs 52 each form a widening 53 directed away from the other tab at the free end. The foot of each tab 52 forms by cross-sectional weakening, e.g. B. through a hole passing through it, a predetermined bending point 56 , so that the tab 52 is bent only at this one point when bending against the axis 10 and otherwise remains essentially straight.

After the securing member 37 has been inserted after inserting the thermal insulation 3 or 4 on the inside of the edge 42 , the tabs 52 are angled approximately at right angles to the inside so that they are resilient on the upper sides of the legs 39 , possibly under tension, so apply that the crossbar of the holding portion 48 is also pressed under tension against the floor or its shoulder. The securing member 37 or its holding section 48 can thus be held without play parallel to the axis 10 . Like the link 37 , the emitter 20 or 21 may have been set after or before, so that it is fixed in its final position by the hold-down member of FIG. 52 and the centering members 38 before the heater is finally assembled. The free ends of the securing members 52 are not sufficient in view of FIG. 33 to the centering members 38 and the emitter 20, but have this distance. Your foot or bending zones 56 are at a distance from the transverse web of the holding section 48 , which corresponds approximately to the length of its legs. Otherwise, this configuration corresponds essentially to the embodiments according to FIGS. 12 to 16 and 20 to 23.

Each of the safety points mentioned can optionally be provided on an outer or an inner emitter 20 or 21 . All of the described features and types of securing or centering members 37 , 38 can be provided only once or several times apart in each embodiment. According to FIG. 33, this is the case in which a plurality of securing or centering points are entered. The passage 101 is shown in FIGS. 1 and 2, the body 103 of FIGS. 3 and 4, the location 106 shown in FIGS. 6 and 7, the body 108 of FIG. 8 or 11, the point 109 in accordance with the FIGS. 9 and 10, the connector 112 shown in FIGS. 12 and 13, the center 114 of FIG. 14, the position 115 shown in FIGS. 15 and 16, the point 117 of Fig. 17, the point 118 of Figs . 18 and 19, the point 120 of Fig. 20 and 21, the location 122 shown in FIGS. 22 and 23, the position 124 shown in FIGS. 24 and 25, the body 126 according to FIG. 26, the point 127 in accordance with FIG. 27 and the point 128 according to FIG. 28 and / or according to FIGS. 31 to 33. The embodiment according to FIG. 7 is preferably provided, the centering of the edge 5 relative to the rest of the base body or the floor 3 in addition to the clamp 47 or instead also being formed directly by the link 37 which, for. B. for centering on the boundary 14 of the edge 4 and parallel to the plane 13 is rigidly connected to the edge 5 .

In addition to or instead of this, a heater 1 a can also have a plurality of separately switchable heating or cooking points according to FIG. 34, the components 3 to 7 and 9 and finally the associated securing and centering means 35 , 36 are assembled to separate units . Two to all of these units can each be centered on a common support 8 a and thus combined to form a Montageein unit which is to be mounted on the plate 30 . The hotplate unit 201 is shown in FIGS. 1 and 2, the unit 203 shown in FIGS. 3 and 4, the unit 206 shown in FIGS. 6 and 7, the unit 208 of FIG. 8 or 11, the unit 209 according to FIGS. 9 and 10, the unit 212 shown in FIGS. 12 and 13, the unit 214 of FIG. 14, the unit 215 shown in FIGS. 15 and 16, the unit 217 of FIG. 17, the unit 218 according to FIGS. 18 and 19, the unit 220 of FIG. 20 and 21, the unit 222 shown in FIGS. 22 and 23, the unit 224 shown in FIGS. 24 and 25, the unit 226 of FIG. 26, the unit 227 according to FIG. 27 and the unit 228 according to FIG. 28, wherein at least one of these units according to FIG. 29 and / or according to FIGS. 31 to 33 can also be formed. The units 209 , 220 and 226 form elongated or oval heating fields 11 , 12, one of which extends approximately centrically symmetrically to the axis 10 , while the smaller and directly adjacent to the annularly closed edge 4 heating field is delimited by this edge 4 in the shape of a crescent moon. This smaller heating field then has a U-shaped outer edge at its edge 4 . When both heating fields are operated, there is an elongated total heating field for heating cooking vessels with a correspondingly elongated base. The heating section of the smaller heating field is correspondingly U-shaped, but is held down or centered in one of the described ways.

All specified properties, e.g. B. orientation, sizes etc. exactly as explained, at least approximately, in essential or only approximately or more deviating provided be.

Claims (11)

1. Radiant heater with a base body ( 2 ) from at least one operating position-taking base body component ( 3 to 9 ), a radiation emitter ( 20 , 21. ) Directed in a radiation direction ( 34 ) through a radiation output ( 31 ) ), which one of an envelope surface ( 19 ) a circumferential boundary ( 15 to 17 ) limited and in a heating plane ( 13 ) lying heating field ( 11 , 12 ) with a transverse to the heating plane ( 13 ) lie the central axis ( 10 ) , within which at least one working member ( 9 , 20 , 21 ) separate from the main body ( 2 ) lies in a working position and with securing means ( 35 , 36 ) for securing the position of the working member ( 9 , 20 , 21 ) relative to the main body ( 2 ) against movements in the radiation direction ( 34 ), the securing means ( 35 , 36 ) including at least one securing member ( 37 , 38 ) separate from the working member ( 9 , 20 , 21 ), which is adjacent to the exit ( 31 ) to the heating plane ( 30 ) a backup occupies position and protrudes relative to the envelope surface ( 19 ), characterized in that at least one securing member ( 37 , 38 ) forms an assembly module with at least one base body component ( 3 to 9 ), in particular in such a way that it is mounted with it before assembly to be secured working member ( 9 , 20 , 21 ) forms the assembly and / or after insertion of the working member ( 9 , 20 , 21 ) in its working position by assembly together with the base body component ( 3 to 9 ) in the safety and operating position is. 2. Heater according to claim 1, characterized in that a base body component ( 3 to 9 ) in peripheral regions of the heating field ( 11 , 12 ), which was at approximately the same radial distances from the central axis ( 10 ) in a Bogenab from are at least about 180 ° to 360 ° apart from one another, in particular that a base body component ( 3 to 8 ) forms a boundary edge ( 4 , 5 , 42 ) which projects above the heating field ( 11 , 12 ) in the radiation direction ( 34 ) and which extends over at least about 180 ° to 360 ° along the circumferential boundary ( 14 to 17 ) it stretches, and that preferably a base body component ( 3 to 7 ) consists of a thermally, electrically or heat-insulating material. 3. Heater according to claim 1 or 2, characterized in that the one securing member ( 37 , 38 ) in the distance neighbors to a circumferential limit ( 14 to 17 ) in wesent union forming material into the interior of a basic body component ( 3rd to 9 ) it is continued that in particular the material forms areas completely encased by the base body component ( 3 to 9 ) and that a securing member ( 37 , 38 ) with a holding section ( 48. ) is preferably separated from a base body component ( 3 to 9 ) ) embedded in the component and / or a securing member ( 37 , 38 ) is at least partially formed in one piece with a base body component ( 3 to 9 ). 4. Heater according to one of the preceding claims, characterized in that a securing member ( 37 , 38 ) rests essentially only at points on the working member ( 9 , 20 , 21 ), that in particular a securing member ( 37 , 38 ) in the region of the heating field ( 11 , 12 ) has exposed hedging sections that are essentially completely rectilinear in view parallel or transversely to the heating plane ( 13 ) and that preferably a securing member ( 37 , 38 ) forming an assembly unit at two spaced-apart locations ( 41 ) for the system is provided on the same working member ( 9 , 20 , 21 ) and is always contact-free between these points ( 41 ) and the working member ( 9 , 20 , 21 ). 5. Heater according to one of the preceding claims, characterized in that a securing member ( 37 , 38 ) for securing two separate and spaced-apart working members ( 9 , 20 , 21 ) is provided that in particular a securing member ( 37 , 38 ) in View on the heating plane ( 13 ) transversely to the central axis ( 10 ) passes through a base body component ( 4 , 5 , 8 ) and projects over it on both sides and that preferably between adjacent working members ( 20 , 21 ) as base body component ( 4 , 5 ) a boundary is provided. 6. Heater according to one of the preceding claims, characterized in that the material of a securing element ( 37 , 38 ) is continued up to two spaced-apart basic body components ( 4 , 5 , 8 ), in particular that a securing member ( 37 , 38 ) with two separate base body components ( 4 , 5 ) forms an assembly module and that preferably a securing member ( 37 , 38 ) passes between two circumferential limits ( 4 , 5 ). 7. Heater according to one of the preceding claims, characterized in that a securing member ( 37 , 38 ) forms a preassembled structural unit with at least one of it and the associated main body component ( 3 to 9 ) separate fuse carrier ( 7 ), in particular that the securing member for the positionally stable fuse carrier ( 7 ) is at least partially embedded on a base body component ( 3 ) by means of stop-limited insertion and that preferably a fuse carrier ( 7 ) is made of a more solid material than a base body component ( 3 to 6 ) , such as metal, insulating material or the like. 8. Heater according to one of the preceding claims, characterized in that a securing member ( 37 , 38 ) with substantially completely assembled base body component ( 3 to 9 ) can be transferred into and out of the securing position, in particular that a securing member ( 37 , 38 ) the securing position resilient and without permanent deformation in an assembly position for the working member ( 9 , 20 , 21 ) can be transferred and that preferably a securing member ( 37 , 38 ) can be transferred by permanent deformation from an initial position into the securing position. 9. Heater according to one of the preceding claims, characterized in that a base body component ( 3 to 5 ) pre-assembled before assembly of the working member ( 9 , 20 , 21 ) is provided with at least one separate reinforcement ( 40 ) which is larger than reinforcement fibers Has expansion and consists of a material that is firmer than the material of the base body component ( 3 to 5 ), that in particular a reinforcement ( 40 ) about the central axis ( 10 ) extends over an arc angle of at least 45 ° to 300 ° and that preferably a reinforcement ( 40 ) at an attachment point is essentially rigidly connected to a securing member ( 37 , 38 ). 10. Heater according to one of the preceding claims, characterized in that a base body component ( 3 to 8 ) by at least one circumferential boundary ( 15 to 17 ) forming, at least partially annular and opposite to an approximately in the heating plane ( 13 ) lying bottom surface ( 27 ) is formed in the radiation direction ( 34 ) projecting edge body that in particular a securing member ( 37 , 38 ) contains a section of a strand material with substantially constant envelope cross sections and that preferably a securing member ( 37 , 38 ) contains a temperature sensor ( 9 ), in the area of the heating field ( 11 , 12 ) at a distance between the heating level ( 13 ) and the radiation output ( 31 ). 11. Heater according to one of the preceding claims, characterized in that for a working member ( 9 , 20 , 21 ) at least one essentially form-fitting centering ( 36 ) transverse to the central axis ( 10 ) and approximately parallel to the heating plane ( 13 ) in At least one of two opposite directions is provided that in particular a centering ( 36 ) contains a centering member ( 38 ) formed in one piece with a securing member ( 37 ) and / or a base body component ( 3 to 9 ) and that a centering member ( 38 ) for direct contact on the outside of a radiation-resistant stand ( 22 ) enclosing pressure-tight and about its longitudinal extent approximately parallel wall ( 23 ) of the working member ( 20 , 21 ) is formed.