Measuring and testing – With fluid pressure – Dimension – shape – or size
Patent
1999-02-05
2000-05-16
Williams, Hezron
Measuring and testing
With fluid pressure
Dimension, shape, or size
73 40, 324 69, 324664, 340605, G01M 328, G01F 156, G01N 2722
Patent
active
060620676
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention relates to an apparatus for measuring hydraulic flow quantities and leaks in a specimen, including a measuring section to which the specimen is coupled and a capacitive sensor which is-disposed in the measuring section and is acted upon both by at least one measurement medium and by at least one medium (pressure medium) for generating a pressure acting on the measurement medium.
Such an apparatus is found for instance in German Patent Disclosure DE 42 05 453 A1. In this apparatus, both the measurement medium and the pressure medium are delivered to the measuring section via separate supply lines intended for them, indirectly via a compensation container. The inlet/outlet for the pressure medium and also for the measurement medium are disposed on the compensation container; the inlet of the pressure medium cannot be closed by a valve, for instance. The specimen communicates with the measuring section via a line. In such an apparatus it is problematic to measure a wide flow range. Furthermore, such an apparatus for measuring hydraulic flow quantities and leaks in specimens cannot be employed at very high pressures, since air is used as the pressure medium, which because of its compressibility necessitates adherence to stringent safety requirements.
U.S. Pat. No. 5,017,909 discloses an apparatus for capacitive detection of a liquid level that makes it possible to signal by means of a signal lamp if the liquid in a container exceeds or drops below a particular level.
Measuring a pressure prevailing in a container by visual and optical means using the liquid level of two liquids adjacent one another in a container is disclosed by U.S. Pat. No. 5,065,616.
Detecting a leak in a fluid system is also disclosed by U.S. Pat. No. 5,152,167, in which a leak is detected via a liquid level found in the reservoir, but this level is not measured capacitively.
The object of the injection is to improve an apparatus for measuring hydraulic flow quantities and leaks in a specimen of this generic type in such a way that in a technologically achieved way, measurements with different requirements are possible, such as measurements at high pressures or measurements over a wide flow range, and the like.
ADVANTAGES OF THE INVENTION
In an apparatus 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 an inlet/outlet for the measurement medium is embodied on a side of the measuring section remote from the specimen, and an inlet/outlet for the pressure medium is disposed directly on the measuring section, on a side of the measuring section toward the specimen.
Embodying the inlet/outlet for the measurement medium and the inlet/outlet for the pressure medium directly on the measuring section has the particularly great advantage that both the measurement medium and the pressure medium can be delivered to the measuring section and thus also to the specimen very quickly and without detours. In particular, by this provision the measuring section can be acted upon directly by the measurement medium and the pressure medium. This arrangement allows a pressure in the measuring section and thus in the specimen to be set precisely.
Advantageously, the inlet/outlet for the measurement medium and the inlet/outlet for the pressure medium can be shut off by valves.
An advantageous embodiment that in particular allows many different measurement methods, provides that these valves are triggerable as a function of pressure. In an exemplary embodiment in which a wide flow range in particular is to be covered, it is provided that a compensation container can be connected parallel to the measuring section.
In another advantageous embodiment, which can be used in particular for hydraulic flow quantities in the inflow at low pressure, a pressure reservoir that can be connected via a valve that is triggerable as a function of pressure is disposed adjacent to the inlet/outlet for the measurement medium on the measuring section.
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Ernst Josef
Kropf Klaus
Schoeffel Eberhard
Seidel Josef
Greigg Edwin E.
Greigg Ronald E.
Robert & Bosch GmbH
Wiggins J. David
Williams Hezron
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