Power plants – Pressure fluid source and motor – Pulsator
Reexamination Certificate
2001-11-15
2003-07-08
Lopez, F. Daniel (Department: 3745)
Power plants
Pressure fluid source and motor
Pulsator
C417S383000
Reexamination Certificate
active
06588209
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
Applicant hereby claims foreign priority benefits under 35 U.S.C. §119 of German Application No. 100 56 708.8, filed Nov. 15, 2000, the disclosure of which is herein incorporated by reference.
BACKGROUND OF THE INVENTION
The invention concerns a method and an apparatus for optimizing the oil flow inside of a diaphragm compressor.
Diaphragm compressors operate similarly to normal piston compressors but have a separating diaphragm between the gas side and oil side. The oil side is formed as the usual piston-cylinder unit whose working volume and dead volume are filled entirely with oil. On the gas side are gas suction and pressure outlet valves. Through the oscillating movement of the piston the volume displaced by the piston is transmitted to the diaphragm which then in turn takes on the intake, the compression and the expelling of the gas. Since the oil pressure during this entire suction and compressing process corresponds to the gas side, one can also speak here of the working of a piston compressor.
A small difference compared to that of a piston compressor however exists in that in a diaphragm compressor a secondary oil circulation must be installed to compensate for the leakage of oil at the piston. For this purpose a compensation pump, driven by an eccentric cam on the crankshaft, is used. This sprays a small amount of oil into the oil space of the compressor synchronously with each piston stroke. This amount must theoretically be exactly as large as the leakage at the compressor piston. Since this cannot be technically realized, always an injected amount of oil is used which is larger than the leakage. This has in turn the result that with each stroke of the compressor piston somewhat too much oil is found in the oil space, which then at the forward dead point of the diaphragm (=engaging the cover) leads to an uncontrollable oil pressure increase. To avoid this an oil overflow valve must also be provided, which limits the oil pressure at the forward dead point of the piston to a value which is slightly above the maximum pressure of the gas.
The curve formed on the cover for engagement with the diaphragm is shaped according to pure mathematical requirements to allow the diaphragm deformed by the pressure to roll onto the surface of the cover from outwardly toward inwardly. In the broadest sense, in comparison with a piston compressor, the diaphragm operates as the piston and the cover surface as a cylinder. A problem however exists in this in that the progressive sealing effect between the diaphragm and cover does not correspond to that between the piston with its piston rings and the cylinder wall. Local gas pockets can be formed between the diaphragm and the cover surface which not only increase the dead space but also diminish the service life of the diaphragm. These local gas pockets have the effect of sealed islands and cannot be removed even with an overly high oil pressure.
The diaphragm compressors illustrated in Publications DE-AS 1 132 285 and DE-AS 1 653 465 illustrate diaphragm compressors having no construction features from which a desired flow path can be recognized for counteracting the local formation of pockets between the diaphragm and the cover surface.
SUMMARY OF THE INVENTION
The object of the invention is to provide a method and an apparatus whereby the danger of internal pocket formation is strongly diminished.
This object is solved by a valve plate which in the pressure stroke of the piston automatically closes holes in the middle area of the aperture plate, and in the suction stroke of the piston again automatically frees said holes.
An advantageous elaboration of the invention is given in claims.
REFERENCES:
patent: 3402667 (1968-09-01), Bower
patent: 3664770 (1972-05-01), Palmer
patent: 4621989 (1986-11-01), Burgert
patent: 1 132 285 (1962-06-01), None
patent: 1 653 465 (1971-11-01), None
Lopez F. Daniel
McCormick Paulding & Huber LLP
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