Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate
1999-06-18
2001-09-25
Batson, Victor (Department: 3671)
Boring or penetrating the earth
With below-ground tool drive prime mover
Fluid rotary type
C418S048000
Reexamination Certificate
active
06293358
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a machine operating according to the Moineau-Principle for use in deep drilling, especially a drill motor, whereby within an unslotted, tubular external part, usually embodied as a stator, a helical inner portion, usually embodied as a rotor, is positioned, wherein the external part is provided with an inner helical lining consisting of an elastomer for receiving the inner part. The exterior part and the inner part can be rotated relative to one another.
In the field of deep drilling, for example, for oil production, machine lengths of multiple meters are required, and, accordingly, large exterior parts in the form of comparatively thick walled, very strong and stable, expensive pipes are needed. It is understood that under these conditions the application and exchange of an elastomer lining at the inner side of the exterior part is very difficult.
It is therefore an object of the present invention to embody the aforementioned machine such that the aforementioned exterior parts can be produced in a substantially simplified manner and that furthermore the lining can be exchanged.
SUMMARY OF THE INVENTION
As a solution to this object, it is inventively suggested to fixedly connect the lining comprised of an elastomer to the inner surface of a tube which is comprised of steel or a similar, stable material, whereby the tube is in the following referred to as the inner tubular member. The inner tubular member is arranged to be longitudinally slidable but securable within the exterior part (outer tubular member). The inner tubular member has a substantially reduced wall thickness relative to the outer tubular member and is sealed relative to the inner surface of the outer tubular member with respect to penetration of conveying or pressure media at its two ends.
With this solution it is possible to produce the lining, which is subject to wear, together with a thin walled tubular body which is of reduced stability and to insert this tubular body together with the lining into the outer tubular member or to remove the inner tubular member, after the lining is worn, from the outer tabular member.
This solution also allows to select a very thin lining which in itself is insufficient with regard to stiffness considerations and to produce the inner tubular member of a smooth, cylindrical tube to which is imparted the shape of the helical lining, whereby optionally the ends of the inner tubular member are embodied to be cylindrical and to match the inner diameter of the outer tubular member.
In order to secure the inner tubular member against axial movement and rotation, the ends of this inner tubular member can be provided with connecting elements, respectively, stop members, which are connected by welding are connected by a threaded connection so as to be detachable. Preferable, these connecting elements are embodied simultaneously as sealing means or are embodied so as to be adapted for receiving separate sealing means.
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patent: 5439359 (1995-08-01), Leroy et al.
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patent: 5603608 (1997-02-01), Marz
Artemis Kautschuk und Kunstofftechnik GmbH & Cie
Batson Victor
Becker R. W.
R. W. Becker & Associates
LandOfFree
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