DE8334772U1 - ELECTRIC CARTRIDGE RADIATOR - Google Patents

Description

The invention relates to an electric cartridge heater with the features specified in the preamble of the patent claim.

Such cartridge heaters are from DE-GM 74 ÜO 309 known. They graze each in a correspondingly sized bore of a device to be heated used without play to the from The heat generated by the cartridge heater is transferred to the device to be heated with almost no loss can.

It is also known to have such cartridge heaters Assign the temperature controller to the electric cartridge heater when the target temperature is reached switch off and when the temperature falls below the setpoint, the cartridge heater again switch on in order to keep the target temperature more or less constant.

But is with your means of the cartridge heater

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Partially to be heated device an additional heating, for example by frictional heat fear, in that case, if the device is already heated to the set temperature, a temporary Overheating can occur by means of the temperature regulator that acts on the cartridge heater can only be corrected extremely slowly and only in such a way that the temperature regulator controls the patient's internal heating element only switches on again after the device temperature has fallen below the setpoint temperature, but without being able to prevent overheating in the meantime.

The object of the invention is now to provide a cartridge heater to improve the type specified in the preamble of claim 1 so that with simple means that are inexpensive to manufacture and measures an overheating of both the device in the area of the cartridge heater and the the latter itself is avoidable.

The solution to this problem is characterized by that the jacket of the heating element of

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a ring-shaped, closed, metallic, prefabricated, in diameter opposite the jacket of the heating element larger and coaxially arranged to the latter outer jacket is included, the jointly having a circular cross-section, form an annulus closed at the end, in which a helically wound, the jacket of the heating element comprehensive coolant raw rleitung is inserted with outwardly led connections, and that the remaining spaces in the annulus with granular and / or powdery, highly thermally conductive, by reducing the sheathing highly compressed substance are filled.

In this way you get an electric palm heater that can also be used as a Cooler can be used to prevent initial overheating to exclude the object to be heated a priori .

Such a cartridge heater is characterized

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body is also characterized by a simple and at the same time compact spatial shape, which is also suitable is, the heat generated by the heater or the cooling exerted by the coolant quickly and evenly to be transferred to the entire surface of the cartridge heater.

It is beneficial in the sense of the task if the helically wound coolant pipeline is arranged directly adjacent to at least one of the jacket.

Further advantageous refinements for improvement the heat exchange consist in the fact that the outer jacket and the granular and / or powdery substance made of highly thermally conductive Mst-ill, in particular made of copper, and that also for closing the end of the annular space in the annular openings at least with a tight fit inserted rings, in particular made of copper, are provided are.

To further improve the heat exchange and also to reduce the space required for the above-described Cartridge heater it is advantageous to

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if the Kühlraittelrohrleltung is so polygonal that it comes into contact with the surface at least one of the sheaths is in contact.

A preferred embodiment is characterized for this in that the coolant pipeline is profiled at least approximately rectangular and that the coolant pipeline with the long Profile sides for the longitudinal extension of the jacket is arranged rectified.

The coolant pipeline can be one behind the other arranged zones with mutually different Have winding slopes in order to increase the cooling at predeterminable points of the cartridge heater or to reduce.

For this purpose, it is also possible to use the coolant pipeline only to form and arrange extending over part of the length of the heater.

Rine advantageous development Ί e s described above l'aLronsnheizkörper is characterized by a U-shaped bent coolant pipe with adjacent

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legs that are mutually aligned and aligned, which are also at the same level to each other and helically with each other with the same winding diameter are wound and that also both end parts at a common end of the coil from the annulus are led to the outside.

The end parts of the coolant pipeline can be approximately directed radially through corresponding breakthroughs in the Outer jacket are passed through.

A preferred embodiment under certain circumstances is for this purpose, characterized in that the end parts of the coolant pipes directed approximately axially parallel through these corresponding openings in the rings arranged on the end face are passed through to the outside.

A preferred, simple and at the same time inexpensive method for the production of the cartridge heater described above consists in that the originally round-profiled coolant pipeline is polygonal in cross section when reducing the diameter of the jacket is profiled and applied to the jackets with surface contact.

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An exemplary embodiment of the invention is shown in the drawing and is described in more detail below. E s 7. eige η:

1 shows an electric cartridge heater in longitudinal section,

Fig. 2 shows a prefabricated detail of the same in the front view.

According to Figure 1 is in a cylindrical shell 1 made of copper, which on one end face with a copper end wall 2 is closed, an electrical, helical heating conductor 3 electrically insulated inserted, wherein the insulating material has been compressed by reducing the jacket 1 in diameter.

The electrical supply lines 5 of the heating conductor are directed axially parallel from the jacket 1 led out. Furthermore, the jacket 1 is from a second, im

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Diameter compared to the jacket 1 larger lind to this coaxially arranged cylindrical Dumbbell 6 also made of copper, the common * on a circular ring-shaped profiled annulus I) i 1 (I e t.

ίη the latter is a helically wound tühlmitte] pipeline 7 is inserted, the connections 8 of which, as can be seen from FIG. 2, are directed axially parallel.

the remaining spaces in the annulus are filled with granular and / or powdery substance Ϊ filled in from copper.

At the front of the annular space, rings 10 are inserted so that they form a seal and the substance 9 is By reducing the diameter of the jacket 6, the insulating compound 4 can now be compressed.

In this case, it is advantageous if the coolant pipe 7 originally has circular cross-sections, which are then reduced during reduction of the jacket diameter is formed into substantially rectangular tube cross-sections and thereby

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flii the coats 1 and 6 placed under surface contact will.

Around both connections 8 of the coolant pipe nus one common end of the cartridge heater to be able to lead out is the coolant pipe junction 7, as can be seen from FIG. 2, initially bent in a U-shape along its longitudinal extension been that both legs are aligned with each other get lost .

Then both legs are then common have been helically wound with the same winding diameter, after which the connections 8 forming leg end parts have been bent axially parallel to them by accordingly to be able to lead profiled openings in one of the rings 10 to the outside.

In Figure 1, the coolant pipe 7 has a zone with a small winding pitch and a second zone with a large winding pitch in order to be in these areas to increase or decrease the cooling.

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In the mouth of the jacket 1 facing away from the bed 2, a sealing plug 11 is still more conventional Kind of tightly arranged, which the electrical leads 5 penetrate.

AJIe new, in the description and / or Individual and combination features disclosed in the drawing are regarded as essential to the invention.

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Claims (12)

1. Electric cartridge heater with at least one heating element, which is in a metallic, tubular Sheathing, in particular made of copper, is used in an electrically insulated manner, and the Insulating material is compacted by reducing the sheath, characterized in that the Jacket (1) of the heating element (3) from a ring-shaped, closed, metallic, prefabricated, in diameter compared to the jacket (1) of the heating element (3) larger and coaxially arranged to the latter outer jacket (6) is included, which together have a Form circular cross-sections having, frontally closed annulus, in walchen a helically wound, the jacket (1) of the Heating element (3) comprehensive coolant pipeline • · • MIl «■ C Hot set 8231/83 (7) is inserted with outwardly led connections (8), and that the remaining Gaps in the annular space with highly thermally conductive, are filled with highly compressed powder by reducing the jacket. 2. cartridge heater according to claim 1, characterized in that that the helically wound coolant pipe (7) at least one of the Sheath (1,6) is arranged directly adjacent. 3. cartridge heater according to claim 1 or 2, characterized characterized in that the outer jacket (6) made of highly thermally conductive metal, in particular is made of copper. 4. Hatronen heater according to one of claims 1 to 3, characterized in that III · · · * · ■■ t · · Hot set 8231/83 the powder consists at least predominantly of copper. 5. cartridge heater according to one of claims 1 to 4, characterized in that for Closing the end of the annulus into the annulus mouths at least with an adhesive fit inserted rings (10), in particular made of copper, are provided. 6. cartridge heater according to one of claims 1 to 5, characterized in that the The coolant pipe (7) is profiled polygonally so that it touches the surface rests against at least one of the jackets (1,6). 7. cartridge heater according to claim 6, characterized in that the coolant pipe (7 • · · t · ! lotset 8231/83 is profiled at least approximately rectangular and that the coolant pipe (7) with the long profile sides for elongating the Sheath (1,6) is arranged in the same direction. 8. cartridge heater according to one of claims 1 to 7, characterized in that the coolant pipeline (7) are arranged one behind the other and have zones which differ from one another Has winding slopes. 9. cartridge heater according to one of the claims 1 to 8, characterized in that the coolant pipe (7) only over part of the Length of the electrical heating element (3) is designed and arranged to extend. 10. cartridge heater according to one of claims 1 to 9, characterized by a U-shaped curved coolant pipe (7) with side by side and aligned with each other • 3 »■ · i pilot set 8231/83 - 5 - Legs that are also at the same level and with the same coil diameter are helically wound and that both Enclteile are led out of the annulus to the outside at a common end of the coil. 11. cartridge heater according to one of claims 1 to 10, characterized in that the end parts of the Kiilmittelrohrlinien (7) directed approximately radially through corresponding openings in the outer jacket (6) i.e. have been carried out. 12. cartridge heater according to one of claims 1 to 10, characterized in that the end parts of the coolant pipes (7) are directed approximately axially parallel through these corresponding openings in the rings (10) arranged on the end face are passed to the outside. PATENTA N W ALT DIPL-ING. CGImm ^ -Jö / ^ C. «Μ COOKING