Measuring and testing – Internal combustion engine or related engine system or... – Compression
Reexamination Certificate
1998-11-06
2001-02-20
Williams, Hezron (Department: 2856)
Measuring and testing
Internal combustion engine or related engine system or...
Compression
C073S040000
Reexamination Certificate
active
06189377
ABSTRACT:
PRIOR ART
The invention relates to a device for measuring hydraulic flow quantities and leaks in a specimen, including a measurement path, embodied as an approximately vertically extending lead line to the specimen, and a capacitor sensor, which is disposed in the measurement path and can be acted upon both by at least one measuring medium and by at least one medium for generating a pressure (pressure medium) on the measuring medium.
One such device is disclosed in German Patent Disclosure DE 42 05 453 A1, for instance. In this device, the measurement path communicates with the specimen via a branch in which a valve is disposed. A problematic aspect of this device that flow and leakage measurements are possible only with limited accuracy, since because of the branch and in particular the valve disposed in the branch, errors can occur, for instance from leaks in this valve, that adulterate the outcome of measurement.
It is therefore an object of the invention to improve a device for measuring hydraulic flow quantities and leaks in a specimen of this generic type in such a way that precise measurements of flow quantities and leaks are possible in a technically easily realized way.
ADVANTAGES OF THE INVENTION
In a device for measuring hydraulic flow quantities and leaks in a specimen of the type described at the outset, this object is attained according to the invention in that the specimen is coupled directly to the measurement path.
Coupling the specimen directly to the measurement path has the great advantage that on the one hand a very precise measurement is possible, and on the other hand no adulteration of the measurement outcomes, which can be caused for instance by leaking valves disposed between the specimen and the measurement path, can occur.
In particular, the direct coupling of the specimen to the measurement path also makes very fast measurements possible, since measurement delays that adulterate the outcome of measurement and are caused by branches, valves and the like disposed between the specimen and the measurement path, for instance, are precluded.
Purely in principle, the most various dispositions for an inlet/outlet for the pressure medium and for an inlet/outlet for the measurement medium are conceivable.
One advantageous embodiment provides that the inlet/outlet for the pressure medium and the inlet/outlet for the measurement medium are disposed on a side of the measurement path remote from the specimen.
This arrangement on the one hand allows a compact design of the overall measurement device and on the other hand highly precise measurements, since except for the measurement path and the specimen, no other fixtures are disposed in the test circuit.
Another advantageous exemplary embodiment provides that the inlet/outlet for the measurement medium is disposed on the side of the measurement path remote from the specimen, and that the inlet/outlet for the pressure medium is disposed on the side of the measurement path remote from the specimen.
Such an embodiment, in an especially simple way, enables measurement of hydraulic flow quantities and leaks on the trailing side (low-pressure side) of the specimen. It is independent of the operating pressure of the specimen and accordingly can be employed up to arbitrarily high pressures.
Particularly for good coupling of the pressurized measurement medium with the specimen and for easier scavenging of any air bubbles that occur, it is provided in an advantageous exemplary embodiment that a turbulence element for creating a rotary flow in the specimen is disposed between the inlet (the high-pressure side) of the specimen and the measurement path.
With regard to the embodiment of the turboulence element, purely in principle the most various embodiments that generate a rotary flow in the specimen are possible. One advantage embodiment provides that the turbulence element is a cylindrical disk with openings inclined in the axial and azimuth direction. Such a turbulence element is on the one hand especially simple to produce and on the other generates especially effective rotary flows in the specimen.
Preferably, shutoff valves are disposed in the lead lines to the inlets and outlets.
With regard to the embodiment of the measurement path and of the capacitive sensor, no more-detailed specifications have yet been made. An advantageous exemplary embodiment provides that the measurement path takes the form of a cylinder, and that the capacitive sensor is a cylinder capacitor. In this way, the capacitive sensor, which is disposed as a cylinder capacitor in the cylindrical measurement path, can be acted upon in an especially simple way by the measurement medium and the pressure medium, since the measurement path and the capacitive sensor in a sense “coincide”.
Purely in principle, the most various fluids can be used as both the measurement medium and the pressure medium.
In one advantageous embodiment, it is provided that the measurement medium is a hydraulic fluid, and that the pressure medium is air.
In another embodiment, which can be used especially advantageously especially at high measurement pressures, it is provided that the measurement medium and the pressure medium are each liquids immiscible with one another.
To avoid short circuits, it is preferably proposed that one of the electrodes of the capacitive sensor is provided with an electrically insulating coating.
Further characteristics and advantages of the invention are the subject of the ensuing description and of the illustrations in the drawings of several exemplary embodiments.
REFERENCES:
patent: 1939067 (1933-12-01), Legg
patent: 2571507 (1951-01-01), Welch
patent: 2629255 (1953-01-01), Hartridge
patent: 3880008 (1975-04-01), Eilersen
patent: 4362052 (1982-12-01), Heath et al.
patent: 4386522 (1983-06-01), Wolff
patent: 5197429 (1993-03-01), Kita
patent: 5449114 (1995-09-01), Wells et al.
patent: 5553580 (1996-09-01), Ganoung
patent: 5803983 (1998-09-01), Simandl et al.
Ernst Josef
Kropf Klaus
Schoeffel Eberhard
Seidel Josef
Greigg Edwin E.
Greigg Ronald E.
Politzer Jay L.
Robert & Bosch GmbH
Williams Hezron
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