DE102012020458A1 - Device for energy transformation for heating metallic base element of container, has support that is provided two permanent magnets which are arranged with respect to each other, and coupled and rotatably supported with drive - Google Patents

Abstract

The device has a base element (2) that is arranged adjacent to the disc shaped support (5) for permanent magnets (6). The support is provided two permanent magnets which are arranged with respect to each other with different polarities. The relative movement between the support and the base element is predetermined. The support is coupled and rotatably supported with a drive. The permanent magnets are extended with the longitudinal axes transverse to a plane spanned by the support. The permanent magnets are made from a neodymium material.

Description

The invention relates to a device for energy transformation by heating a base element made of a metal, in which a carrier for permanent magnets is arranged adjacent to the base element and has at least two permanent magnets which are arranged with relatively different polarities on the carrier and in which a relative movement between the Carrier and the base element can be specified.

Such devices are known in one embodiment as so-called eddy current brakes. An object to be braked is here coupled to a rotatable disk which rotates between stationary permanent magnets. Due to an interaction between induced eddy currents and the magnetic fields of the permanent magnets, the kinetic energy is converted into heat energy and from this the object in question is decelerated.

Likewise, it is already known to rotate metallic disks between stationarily arranged permanent magnets and to generate eddy currents by the cyclical changes in the application of the magnetic fields, which heat the respective disks. The heat energy released in this case can be used to heat a fluid, for example water.

Such heaters are used for example in the DE 199 15 842 A1 described.

The efficiency of the energy transformation as well as a simple operation are not sufficiently possible in the known devices.

In particular, in connection with the heating of fluids by rotating disks, the required shaft seals prove to be expensive.

Object of the present invention is to construct a device of the aforementioned type such that the energy transformation is feasible with a high efficiency and a simple basic structure.

This object is achieved in that the carrier is mounted rotatably and coupled to a drive.

The inventive use of a rotatable support for the permanent magnets, it is possible to arrange the base element stationary. As a result, expensive seals are avoided and both in terms of the design of the carrier as well as in terms of the arrangement of the permanent magnets and the speeds provided there is a lot of scope for adaptation to given boundary conditions.

The basic principle of the present invention thus consists in a magnetically induced eddy current heating. A drive can be done using an electric motor, for example. The carrier for the permanent magnets is preferably to be realized as a rotatably mounted disc.

In the field of building heating, use can be made, for example, to increase a return temperature or to recharge the storage.

Another field of application is in the field of electric ovens for kitchen applications. Here are known so-called induction cooktops in which eddy currents are generated in the metallic bottom of the cooking vessels. The changing magnetic fields are generated by stationary arranged coils, which are suitably controlled. Side effects of such hobs by unwanted propagation of electromagnetic fields are still largely unexplored. When variable magnetic fields are generated by the rotation of a carrier fitted with permanent magnets, unwanted electromagnetic radiation is completely avoided; magnetic fields generated by the permanent magnets can be very effectively shielded depending on the direction.

A lightweight and stable construction is provided by the fact that the carrier is plate-like.

An effective energy transformation is supported by the fact that the permanent magnets extend with their longitudinal axes substantially transversely to a plane spanned by the carrier.

According to a typical embodiment, it is provided that the base element is designed as the bottom of a container.

A suitable choice of material is that the permanent magnets are formed of a neodymium material.

A high efficiency is also supported by the fact that the base element is flat in the region of its surface facing the carrier.

An advantageous frequency for the magnetic field changes is achieved in that the carrier has a speed in the range of 400 to 3000 revolutions per minute.

Unwanted propagation of the magnetic field can be avoided by arranging the carrier at least partially magnetically shielded.

Impairment of the permanent magnets can be avoided, that the container has an operating temperature of 80 ° Celsius maximum.

A uniform heating of the base element is supported by the fact that the base element laterally overhangs the carrier.

The metallic material of the base element can be heated inductively. The material can not be magnetically formed. For example, made of copper or aluminum. In principle, however, magnetizable metals are also usable, for example stainless steel.

In the drawings, embodiments of the invention are shown schematically. Show it:

1 A side view of a water reservoir with a metallic bottom as the base element and a rotatable disk-shaped carrier with permanent magnets arranged below the base element, wherein the disk is driven by an electric motor,

2 1 is a schematic representation of a plan view of the disc-shaped carrier with permanent magnets,

3 one opposite 1 modified embodiment in which the drive motor is arranged laterally and coupled to the carrier via a V-belt,

4 a further variant for the arrangement of a drive motor for the disc-shaped carrier.

According to the embodiment in FIG 1 is a container ( 1 ) with a base element ( 2 ) provided as a floor. The container ( 1 ) has an inlet ( 3 ) as well as a procedure ( 4 ) on.

In the vertical direction below the base element ( 2 ) is a carrier ( 5 ) arranged with permanent magnets ( 6 ) is provided. The carrier ( 5 ) is with a motor ( 7 ) coupled.

According to the arrangement in 1 is the engine ( 7 ) in the vertical direction below the carrier ( 5 ) and the carrier ( 5 ) is directly on a motor shaft ( 8th ).

2 illustrates a top view of the carrier ( 5 ). It can be seen that preferably along a circumference of the carrier ( 5 ) Permanent magnets ( 6 ) are arranged. In a circumferential direction of the carrier ( 5 ), the permanent magnets ( 6 ) alternating magnetic polarities.

According to the embodiment in FIG 3 is the engine ( 7 ) laterally to the carrier ( 5 ) or to the container ( 1 ) arranged. As a result, the height is reduced. The motor ( 7 ) can in this case with a drive wheel ( 9 ) equipped with a coupling element ( 10 ) with a drive wheel ( 11 ) of the carrier ( 5 ) connected is. The coupling element ( 10 ) can be realized for example as a V-belt.

4 shows one opposite 3 modified embodiment in which the engine ( 7 ) with its drive wheel ( 9 ) is arranged in the vertical direction pointing upwards.

As material for the permanent magnets ( 6 ) is particularly intended for the use of a neodymium material. Such magnets have very strong magnetic fields at a spatially small extent. Preferably, the permanent magnets ( 6 ) in recesses or through-holes of the support ( 5 ) are used to achieve high mechanical stability. The carrier ( 5 ) may be formed for example of metal, in particular of aluminum, or of a plastic.

Operating temperature for the container ( 1 ) is intended for a range from 35 ° C to 75 ° C. Preferably, the temperature is below 80 ° Celsius.

The container ( 1 ) is preferably formed pressure resistant. For this round shapes prove to be beneficial. In addition, the container ( 1 ) to be provided with a thermal insulation, for example by an externally applied insulation material. With regard to the compressive strength is intended to a compressive strength of at least 3 bar.

Preferably, the base element ( 2 ) at least in the area of its carrier ( 5 ) facing outside a flat surface. The carrier ( 5 ) is preferably formed disk-shaped.

The carrier ( 5 ) is preferred with a small distance to the base element ( 2 ) arranged. A speed of the carrier ( 5 ) is preferably in a range of 400 to 3,000 revolutions per minute.

Preferably, the base element overhangs ( 7 ) laterally the carrier ( 5 ). Regarding a midline of the container ( 1 ), the base element ( 2 ) is therefore larger in size than the support ( 5 ) relative to its axis of rotation. A lateral projection of at least 6 cm proves to be expedient for sufficient heating of the outer regions of the base element (FIG. 2 ) to support.

A concrete constructive realization takes place depending on the given boundary conditions. In particular, an engine ( 7 ) can be realized with a fixed speed or a variable speed. Both the arrangement and the number of permanent magnets ( 6 ) on the support ( 5 ) is application-dependent. For larger outputs, for example, power above 3 KW, it is possible within the container ( 1 ) above the base element ( 2 ) at least one Wärmeleitblech to heat transfer to the inside of the container ( 1 ), for example water.

The drive of the engine ( 7 ) can be controlled. For example, it is possible within the container ( 1 ) to arrange a heat sensor and to specify when falling below a minimum temperature operation. In a coupling with conventional boilers is especially thought to make a switch-on at a temperature of about 5 ° Celsius below the switch-on of the boiler. As a result, an unfavorable operation of the boiler and thus a local environmentally friendly combustion is avoided.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 19915842 A1 [0004]

Claims (10)

Device for energy transformation for heating a base element made of a metal, in which a carrier for permanent magnets is arranged adjacent to the base element and has at least two permanent magnets which are arranged with relatively different polarities on the carrier and in which a relative movement between the carrier and the base element can be predetermined, characterized in that the carrier ( 5 ) is rotatably mounted and coupled to a drive. Device according to claim 1, characterized in that the carrier ( 5 ) is plate-like. Device according to claim 1 or 3, characterized in that the permanent magnets ( 6 ) with their longitudinal axes substantially transverse to one of the carrier ( 5 ) extend spanned plane. Device according to one of claims 1 to 3, characterized in that the base element ( 2 ) as the bottom of a container ( 1 ) is trained. Device according to one of claims 1 to 4, characterized in that the permanent magnets ( 6 ) are formed of a neodymium material. Device according to one of claims 1 to 5, characterized in that the base element ( 2 ) in the area of its wearer ( 5 ) facing surface is flat. Device according to one of claims 1 to 6, characterized in that the carrier ( 5 ) has a speed in the range of 400 to 3,000 revolutions per minute. Device according to one of claims 1 to 7, characterized in that the carrier ( 5 ) is arranged at least partially magnetically shielded. Device according to one of claims 1 to 8, characterized in that the container ( 1 ) has an operating temperature of 80 ° Celsius maximum. Device according to one of claims 1 to 9, characterized in that the base element ( 2 ) laterally the carrier ( 5 ) overhangs.

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