Measuring and testing – Fluid pressure gauge – Diaphragm
Patent
1984-09-20
1986-08-12
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Diaphragm
73172, G01L 708
Patent
active
046049010
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a hydraulic pressure receiver by which the incompressible fluid is found in an elastic tubular housing that acts upon an external pressure and which is connectable to a pressure guage or transformer.
BACKGROUND OF THE INVENTION
In many areas of engineering, hydraulic pressure receivers are used which are capable of receiving changing external ratios of load and transmitting them to a suitable measuring instrument or recording means or ac-vf converter. For this, an incompressible fluid, such as water, is found in a compressible housing of, for example, rubber-like material, which is connectable to the measuring means.
It has become apparent with such pressure receivers that only very short, compact pressure receivers, by which the compressive load can take place evenly over the whole length of the housing, pass precise and always constant relative pressure values to the measuring means, as such pressure receivers function as hydrostatic piston-cylinder systems.
However, as soon as a tubular-shaped housing of a relatively great length is used, as is required, for example for the monitoring of changes of pressure over large distances or surface areas, great deviations in the measured relative pressure values occur by the same compressive load on the housing and, that is, in dependence on the distance of the area receiving the load from the point of attachment of the elastic pressure receiver housing on the measuring means.
The reason for this is the elastic housing's no longer being even over its whole extent but now point loaded, which, under the inward deformation of a part of the housing wall, the displaced fluid is able to flow to another place owing to the outward deformation on the housing wall, and, moreover, the pressure impulse continues wave-like in the fluid, whereby the wave energy, as is generally known, diminishes by the square of the distance from the wave centre (pressure impact point). The farther the distance, therefore, of the pressure impact on the housing wall from the load-receiving point of the elastic pressure receiver on the measuring means takes place, so the smaller the measured relative pressure becomes. This restricts, of course, the scope of application of such hydraulic pressure receivers by a considerable extent.
OBJECT OF THE INVENTION
It is therefore the object of the present invention to create a hydraulic pressure receiver of the previously mentioned type, which, with the avoidance of the described disadvantages of the known technical level, can be of considerable length and is able to be acted upon by pressure at any desired place of the elastic pressure receiver housing without having to expect by the same pressure, deviations in the relative measured values.
SUMMARY OF THE INVENTION
This is achieved in accordance with the invention in that the inside of the tubular housing is an inflexible tube, at least approximately concentric, extending lengthwise in the housing, the casing thereof defining with the inside wall of the housing an annular clearance, which is closed at both its face ends, whereby it is foreseen that the inner tube is connected at one of its ends to the pressure guage or transformer, and has a plurality of radial bores distributed over the whole length of the tube.
By means of these measures it is henceforth possible, in the first place, to eliminate the fault caused by a damping of the pressure conveying fluid, for the fluid pressure is no longer measured in an elastic pressure receiver housing but in an inflexible inner tube. In addition, being that the inner tube is provided with a plurality of radial bores distributed over the whole length of the tube, the said bores create, at a pressure impact on the elastic pressure receiver housing, transverse components forming the pressure wave that spreads in the ring clearance, and, according to the theory of the spreading of waves in a confined space, new wave centers directed in the inside of the inner tube; at each radial bore the continually
REFERENCES:
patent: 2261027 (1941-10-01), Hopkins
patent: 4052903 (1977-10-01), Thordarson
Dubno Herbert
Ross Karl F.
St Sensortechnik AG
Woodiel Donald O.
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