Measuring and testing – Fluid pressure gauge – Bourdon
Patent
1998-05-20
2000-04-04
Oen, William
Measuring and testing
Fluid pressure gauge
Bourdon
G01L 704
Patent
active
060447125
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a pressure gauge of the type with a Bourdon tube.
BACKGROUND OF THE INVENTION
Pressure gauges of this type generally include a body, a pressure sensor member consisting of an elastically deformable bent tube which is fixed to the said body and has a fixed end for communicating with a fluid with a view to measuring its pressure and a closed opposite end which is free to move relative to the said body under the effect of the pressure of the fluid and controls a pressure indicator.
These pressure gauges have very high precision but include particularly fragile parts, for example the mechanism connecting the Bourdon tube to the needle, the needle and the Bourdon tube.
In order to prevent the pressure gauges from being destroyed when they are subjected to direct impacts, that is to say impacts which are directly applied to them, it is known to equip their casing with an elastomer liner in order to absorb the impacts. Other pressure gauges are equipped with a metal grill forming a cage around the casing.
Protectors of this type give effective protection against direct impacts.
However, protectors of this type are not effective against accelerations in excess of 400 g, for example due to dropping a bottle on which the pressure gauges are fitted.
Indeed, under the effect of its own weight and the weight of the parts which are fixed to it, the Bourdon tube will in this case tend to deform beyond its elastic limit, which causes damage to the pressure gauge.
Furthermore, when it deforms, the tube may crush the needle control mechanism, which makes the pressure gauge unusable.
SUMMARY OF THE INVENTION
The object of the invention is to overcome these drawbacks and to provide a pressure gauge which can withstand indirect impacts, that is to say ones where the point of impact does not lie on the pressure gauge itself.
The invention therefore relates to a pressure gauge of the aforementioned type, characterized in that it includes at least one stop which is intended to limit the deformation of the tube and is interposed between the body and the tube.
The invention may furthermore include one or more of the following characteristics: direction of the tube by an active part which is in the form of a circle arc and is arranged facing a region of the tube intermediate between the fixed and free ends; with convexity turned towards the tube and a radius of curvature substantially equal to that of the tube, and on which the radially inward surface of the tube abuts; least one partially annular lip for limiting the movement of the tube in a direction perpendicular to the plane defined by the bent tube; active surface, coaxial with the convex active surface, with convexity turned towards the tube and the radius of curvature substantially equal to that of the tube, the concave active surface extending radially outwards relative to the convex active surface in order to limit the movement of the tube in a radially outward direction; fastening on the body; the direction of the closed free end of the tube and on which this end abuts; tube; relative to a graduated dial, and the said finger has a screwthread co-operating with a complementary tap made in the body or in the remaining part of the stop and constitutes a member for adjusting the position at rest of the needle facing the origin of the graduation; the body which is extended in the direction of the tube by a cylindrical active part coaxial with the bent tube; material.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages will emerge from the following description, given solely by way of example and without implying any limitation, and with reference to the appended drawings, in which:
FIG. 1 represents a schematic bottom view of a first embodiment of a pressure gauge according to the invention;
FIG. 2 is a sectional schematic view illustrating another embodiment of the active region of the stop of the pressure gauge in FIG. 1;
FIG. 3 illustrates a third embodiment of the active region of the stop
REFERENCES:
patent: 1169982 (1916-02-01), Manning
patent: 1414121 (1922-04-01), Gabel
patent: 1539101 (1925-05-01), Adams
patent: 1632749 (1927-06-01), Shaw
patent: 2052409 (1936-08-01), Kollsman
patent: 4108007 (1978-08-01), Neubeck et al.
Cannet Gilles
Charbonnel Jean-Christophe
Thouvier Stephane
L'Air Liquide Societe Anonyme pour l'Etude et, l'Exploitation de
Oen William
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