Rotary kinetic fluid motors or pumps – With control means responsive to motion developed fluid...
Reexamination Certificate
1999-12-21
2001-06-26
Ryznic, John E. (Department: 3745)
Rotary kinetic fluid motors or pumps
With control means responsive to motion developed fluid...
C392S315000
Reexamination Certificate
active
06250875
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a heater.
2. Background Art
EP 0 313 764 A2 teaches a heater, which comprises a component fitted with permanent magnets and joined to a rotor shaft which is mounted for rotation in a casing. Individual soft iron cores are disposed in the casing. A heat transfer medium, in particular cooling water, flows around the soft iron cores inside the casing. Practice has shown that this arrangement helps translate mechanical energy into heat only to a very limited extent.
An eddy-current brake is known from the lexicon “Maschinenbau, VDI Verlag 1995, ISBN 3-401372-3, page 1430”, which is an electric brake of non-contact operation, translating mechanical energy into heat by eddy currents in a metallic mass. By design the eddy-current brake is an internal-pole-type d.c. generator. In this case, a stationary inner ring supports a coil through which passes direct current and which produces a homopolar magnetic field. An armature ring of electrically conductive material constitutes the active part of a rotor. Upon rotation of the rotor relative to a stator, eddy currents are induced in the armature ring, cooperating with the stator field to produce a braking moment, the range of which depends on the exciting current and the slip speed. Eddy-current brakes of this type are employed among others in trucks as an additional brake on the propeller shaft.
A heater is known from PCT application WO99/10971 (no prior publication), having a casing with an interior chamber, a cooling-water supply connector and a cooling-water discharge connector opening into the interior chamber. A rotatably drivable rotor shaft is mounted for rotation in the casing. Two component parts are provided, which are coaxial to the axis and one part of which is provided with permanent magnets, while the other part is a closed ring of electrically conductive material disposed at least partially in the interior chamber. One of these parts is non-rotatably disposed as a rotor on the rotor shaft. The parts are rotary relative to each other, leaving a gap between the permanent magnets and the part of electrically conductive material.
DE 196 00 735 A teaches a cooling-water pump for an internal combustion engine, which comprises a bearing casing for the shaft of an impeller. A belt pulley is mounted on the outer end of the shaft. A heater, which is embodied as a so-called Visco-heater, is disposed as a substantially independent additional set on the bearing casing.
SUMMARY OF THE INVENTION
It is an object of the invention to embody a heater in such a way that it is especially simple in structure and thus operationally reliable.
According to the invention, this object is attained in a heater comprising a casing, which has an interior chamber; a cooling-water suction line and a cooling-water discharge line, each of which opening into the interior chamber; a rotatably drivable rotor shaft which is rotatably mounted in the casing, having a central longitudinal axis; a rotor, which is mounted non-rotatably on the rotor shaft and on which are formed an impeller for the conveyance of cooling water from the cooling-water inlet to the cooling-water outlet and an eddy-current disk of electrically conductive material, of an eddy-current heater; a magnet support, which is provided with permanent magnets and is non-rotary in the casing and which is displaceable in the direction of the axis into a position of rest at a distance a from the eddy-current disk, and into an operating position with a very narrow gap being left between the eddy-current disk and the permanent magnets. The measures according to the invention ensure in a simple way that the permanent magnets can be shifted between a position of rest with no or only irrelevant residual induction taking place in the eddy-current disk and an operating position with eddy currents being induced in the eddy-current disk. The magnet support and the permanent magnets situated thereon are not dynamically loaded.
Especially advantageous measures for the displacement of the magnet support between its position of rest and its operating position consist in that the magnet support is displaceable against a compression spring from the position of rest into the operating position; in that at least one linear drive is provided for displacement of the magnet support from the position of rest into the operating position; and in that the at least one linear drive is a hydraulically actuated piston-cylinder drive. Instead of hydraulically actuated piston-cylinder drives, use can also be made of so-called thermoactuator elements as linear drives, which are controlled by the temperature of the cooling-water; they have the drawback of working by analogy to the temperature of the cooling-water and not between two discrete positions. Furthermore, commercial electric stepping motors having a spindle nut drive may be used as linear drives.
Advantageous embodiments of the magnet support consist in that the magnet support is a magnet supporting ring; and in that the magnet support is displaceably guided against rotation on a hub of the casing. Excellent heat transfer from the entire heater to the cooling water is attained in an embodiment wherein the interior chamber is divided by the rotor into a pump room and a partial casing chamber, which houses the eddy-current heater; and wherein the pump room and the partial casing chamber are interconnected by a channel. A way of how the heater and its pump can be integrated in an internal combustion engine, simultaneously serving as a cooling-water pump thereof, consists in that the casing comprises a first partial casing and a second partial casing, the second partial casing being formed in the casing of a water-cooled internal combustion engine; and in that the pump room and the impeller are substantially disposed in the second partial casing.
Further features, advantages and details of the invention will become apparent from the ensuing description of an exemplary embodiment, taken in conjunction with the drawing.
REFERENCES:
patent: 3666917 (1972-05-01), Oglesby
patent: 196 00 735 (1997-07-01), None
patent: 0313764 (1989-05-01), None
patent: 9910971 (1999-03-01), None
Martin et al., “Kuhlmittelpumpe mit degressivem Forderverhalten”,.
Bauer Hans-Jurgen
Bilek Andreas
Kilian Gunter
Teufel Bernhard
Audi AG
Browdy & Neimark
Ryznic John E.
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