Pumps – Motor driven – Electric or magnetic motor
Patent
1996-07-10
1998-07-14
Izaguirre, Ismael
Pumps
Motor driven
Electric or magnetic motor
62 6, 267161, 60520, F04B 4504, F16F 0134
Patent
active
057794553
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a device for guiding and centering a machine element which carries out oscillating linear motions in the direction of its central axis, wherein the machine element is supported in a housing on two guides disposed at a distance with respect to one another in the direction of the central axis.
Among other things, such devices for guiding and centering a machine elementare used in vibration compressors. From DE-A1-30 30 711 is known a vibration compressor intended for refrigerators. In this known vibration compressor via a drive winding supplied with alternating current, and a magnet with a magnetic pole a piston is set into translational oscillating motions. This piston is supported in a cylinder liner which forms a slideway. In order to ensure the required function of the compressor, drive winding, piston and cylinder liner must be precisely aligned with respect to one another on the central axis which requires considerable constructional expenditures. In addition, the problem of sealing between piston wall and cylinder liner wall exists, which is solved in known manner through piston rings or by means of a gap seal or other known means. With high mechanical stress of the piston through transverse forces, often additional mechanical guides of the piston must be provided, which further exacerbates the problems of the central alignment and causes high requirements made of the manufacturing precision and therewith high costs, wherein during operation wear and tear occurs nevertheless at the guidance and centering arrangements. The occurrence of sliding friction demands further the use of a lubricant such as oil or grease. This wear-and-tear can interfere considerably with the operation of the compressor since material abrasions mixed with lubricants can be intrained in the coolant circulation, or the functional capacity and the performance of the compressor decreases considerably. In particular in the case of arranging gap seals, long guidance and centering ranges are necessary leading to a greater material expenditure and corresponding constructional implementation. The longer the guidances the more difficult it becomes, however, to center these so that between piston wall and cylinder liner wall no contact and wear-and-tear takes place.
Pistons, which carry out oscillating linear motions along a central axis, are also used in free-piston motors, for example Stirling motors. In this case similar known solutions are also employed such as have been discussed in connection with the known oscillating compressors. In the process the same difficulties are encountered wherein contact-free sealing surfaces between piston and cylinder wall, if at all, can only be attained with very high expenditures and correspondingly high costs. Because of the difficult operating conditions, nevertheless, again and again abrasions occur between the moving machine elements whereby operation of such free-piston motors is strongly disturbed and maintenance-free service life is considerably reduced. For very small free-piston arrangements in heart replacement pumps, from the publication "Stirling-Engines", G. Walker, Clarendon Press 1980, pages 404 and 405, devices are known which are said to support retain the free piston without contact in the cylinder liner with the aid of springs. One of the solutions provides that strap-form springs are connected at the outer ends with the piston and are secured in the central region on the cylinder head. Such bent-over spring bands, however, cannot in practice be produced with the desired quality and uniformity which would ensure the desired precise guidance of the piston in the cylinder. In particular the bending-over of the strap ends connected with the piston leads to considerable difficulties, and in this region damages occur very often. In principle, this implementation would allow the oscillation of the piston, however is not capable of ensuring the requirements made of the precision and reliability of the guidance and centering. As a further solution the use of heli
REFERENCES:
patent: 3303990 (1967-02-01), Curwen
patent: 5011379 (1991-04-01), Hashimoto
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