Rotary positive displacement machine with helicoid surfaces of p

Details Rotary positive displacement machine with helicoid surfaces of p Rotary positive displacement machine with helicoid surfaces of p

1994-04-22

1995-08-08

Bertsch, Richard A.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418150, F01C 110

Patent

active

054393590

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a positive displacement machine which is formed by a male organ and a female organ (tubular body) that surrounds it.
In this machine, the outer surface of the male organ, which will be called the male surface, and the inner surface of the female organ, which will be called the female surface, are helicoidal surfaces whose axes are parallel and are spaced apart from one another by a length that will be designated as E.
These surfaces are defined about these axes by the nominal profile that they have in any section perpendicular to the axes (cross section) and by their respective pitches P.sub.m and P.sub.f.
The delimitation of the volume of the work chambers of the machine and the axial progression of these chambers, which characterizes this type of mechanism when P.sub.m and P.sub.f are finite, result from the fundamentally linear contacts between the male surface and the female surface; the relative motion of these two surfaces displaces these linear contacts spatially.
In the machines in question here, the directrix of the male surface, which will be called the male profile, has an order of symmetry n.sub.m about its center, which is the point O.sub.m of the axis of the male surface in the plane of the profile. This profile is inscribed in the circular ring with a center O.sub.m, of width 2E and having a mean radius R.degree..sub.m (ring containing the male profile).
The directrix of the female surface, which will be called the female profile, has an order of symmetry (n.sub.m +1) about its center, which is the point O.sub.f of the axis of the female surface in the plane of the profile. This profile is inscribed in the circular ring having the center O.sub.f, the width 2E, and the mean radius R.degree..sub.f =R.degree..sub.m +E (ring containing the female profile).
The mean radius R.degree..sub.m may be considered as the parameter that determines the scale of the cross section of the mechanism, and the parameter E may be considered as a parameter of shape.
The ratio between the pitches of the male and female surfaces is determined by the orders of symmetry of the profiles, in accordance with the equation P.sub.f /P.sub.m =(n.sub.m +1)
.sub.m.
In the machines in question, the male organ is in planetary motion relative to the female organ. The first rotation of this planetary motion drives the axis of the male surface, at an arbitrary speed .omega., to make this axis describe a cylinder of revolution having a radius E about the axis of the female surface. The second rotation composing the relative planetary motion drives the male organ to make it rotate about the axis of the male surface at the speed (-.omega.
.sub.m).
Finally, when P.sub.m and P.sub.f are finite, the fluid with which the machine exchanges energy can be admitted via a cross section at the end of the mechanism and can escape via its other end, without requiring any distribution contrivance.
The known machines that meet this description, (such as French Patent FR-A-997957 of Moineau, other previous Moineau patents, and U.S. Pat. No. 3,975,120 Tschirky) in which P.sub.m and P.sub.f are finite, are used in particular as downhole motors in petroleum, gas or geothermal drilling, where their slender cylindrical external shape is of direct benefit. In these motors, the female organ most often belongs to the stator, while the planetary motion of the male organ relative to this female organ is accordingly identified with its absolute motion. The male and female profiles of the helicoidal surfaces used in these machines are described by W. Tiraspolsky, in Les moteurs de fond hydrauliques, cours de forage (Hydraulic Downhole Motors in Drilling), pp. 258 and 259, published by Editions TECHNIP, Paris 15; the male profile is considered to be the curve at a uniform distance D from the ordinary trochoid having an order of symmetry n.sub.m, and the female profile of mean radius R.degree.m+E is considered to be the curve at the same uniform distance D from the ordinary trochoid having the order of symmetry (n.sub.m +1).
If the curv

REFERENCES:
patent: 2525265 (1950-10-01), Moineau
patent: 3168049 (1965-02-01), Taylor et al.
patent: 3208391 (1965-09-01), Lindberg
patent: 3975120 (1976-08-01), Tschirky
patent: 4482305 (1984-11-01), Natkai et al.
patent: 4692105 (1987-09-01), Leroy
patent: 4773834 (1988-09-01), Saruwatari

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