Rotary expansible chamber devices – Working member has planetary or planetating movement – Helical working member – e.g. – scroll
Patent
1998-01-30
2000-05-16
Denion, Thomas
Rotary expansible chamber devices
Working member has planetary or planetating movement
Helical working member, e.g., scroll
418 555, 418 57, 418101, F01C 102
Patent
active
060628332
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a spiral compressor having two intermeshing spiral compressor disks or scroll members rotating about respective axes that are offset from one another, so as to cause a motion of the spiral disks relative to each other to generate the compression effect.
BACKGROUND INFORMATION
In the generation of compressed air, and particularly in the oil-free generation of compressed air in rail vehicles, the compressor technology is subject to special requirements as a result of the large quantities of air that are to be generated and the extremely rough operating conditions. Complete operability must be assured even under rough environmental conditions (temperature, vibrations, shocks, etc.).
In the field of rail vehicles, oil-free spiral compressors are receiving ever more attention, especially in order to prevent the formation or accumulation of oil-containing condensate and in order to simplify the maintenance. Because the capacity of the compressors is to be greatly increased (for example suction volume flows of approximately 1600 1/min) in applications in rail vehicles, in comparison to the typical capacity of present conventional oil-free spiral compressors which are commercially available, and because of the subsequent high loads applied to the spiral compressor as a consequence thereof, it is not possible to simply enlarge such conventional compressors, especially in view of the very high axial forces which have the tendency to push the spirals of the compressor apart from one another. In so-called one-sided spiral arrangements, the support or counter bearing of such axial forces is particularly problematic, since very large bearings are required. These problems are increased in view of the required oil-free compression, due to which it is very difficult to remove or dissipate the frictional power or heat of the bearings. For the above mentioned reasons, compressors having a one-sided spiral arrangement have to date been regarded as not usable in the field of rail vehicles.
It is a further problem in such spiral compressors that the effort and complexity required for providing an "anti-rotation arrangement", which ensures the correct relative positioning of the two spirals, must be held as low as possible. According to the prior art, an Oldham-type coupling was generally used, but such a coupling is relatively unsuitable for larger units as well as for oil-free compressors. Conventional adjacent eccentric arrangements involve a considerable structural effort and complexity, especially in view of the great number of required bearings.
SUMMARY OF THE INVENTION
In view of the above, it is an object of the invention to construct a spiral compressor, which preferably operates in a completely oil-free manner with a one-sided spiral arrangement, such that an exact relative positioning of the two spirals is ensured, even for large suction volume flows as well as for large compression ratios. Especially, unnecessary frictional engagement or meshing that could lead to jamming is to be prevented from occurring during the relative movement of the two spirals as necessary for forming the compression pockets. The invention further aims to avoid or overcome the disadvantages of the prior art, and to achieve additional advantages, as apparent from the present description.
The above objects have been achieved in a spiral compressor according to the invention, comprising a housing, first and second rotation bearings supported in the housing with respective first and second axes of the first and second bearings being laterally offset from each other, a first spiral disk connected to a first shaft that is rotatably supported in the first rotation bearing, and a compression crown that is rotatably arranged at an axial spacing away from the first spiral disk and that is connected to the first spiral disk so as to rotate therewith. The compression crown has at least one drive engagement opening on a side thereof facing toward the first spiral disk. The compressor further comprise
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patent: 5024589 (1991-06-01), Jetzer et al.
patent: 5295808 (1994-03-01), Machida et al.
patent: 5346374 (1994-09-01), Guttinger
patent: 5752816 (1998-05-01), Shaffer
patent: 5938419 (1999-08-01), Honma et al.
Frank Robert
Holzapfel Christian
Zoerner Wilfried
Denion Thomas
Fasse W. F.
Fasse W. G.
Knorr-Bremse Systeme fur Schienenfahrzeuge GmbH
Trieu Thai-Ba
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