Pumps – Motor driven – Relatively movable pumping members driven by relatively...
Patent
1981-02-17
1987-07-07
Smith, Leonard E.
Pumps
Motor driven
Relatively movable pumping members driven by relatively...
92 75, 92146, F01B 702, F01B 100
Patent
active
046784071
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to multi-tandem free piston machines, comprising several pairs of parallel drive cylinders, each cylinder containing two opposite free drive pistons, fastened to compressor pistons.
The invention relates more particularly to a multi-tandem free piston machine comprising a mounting, an inner movable mechanism comprising a central cross-member transversal to an axis of the mounting, guided in translation so as to be movable with an alternating movement along said axis, bearing, on each side, four inner drive pistons movable along drive cylinders arranged at the corners of a rectangle and two compressor pistons sliding in inner compressor cylinders of which the axles pass outside said rectangle, an outer movable mechanism comprising two outer cross-members connected by at least one tie-rod, each bearing four outer drive pistons movable in four of said drive cylinders and two compressor pistons sliding in outer compressor cylinders, and synchronising means for the alternating movement of the two mechanisms.
The invention is directed at providing a multi-tandem machine whose frame has very high rigidity, ensuring satisfactory guidance of the mechanisms whilst permitting easy dismounting of the cylinders, notably of the cylinders which have a large axial size.
With this object, the invention proposes a machine in which the mounting comprises a base, an upper header and two frames connecting the base and the header, arranged symmetrically with respect to a middle plane of the mounting and on which the outer compressor cylinders are fixed through their face turned towards the middle plane, the opposite faces of said outer compressor cylinders being connected by plates.
The invention finds particularly important application in energy-producing installations comprising a free piston machine, a gas turbine which receives the exhaust gases from the drive cylinders and a compressor which provides the compressor cylinders with air at a pressure above atmospheric pressure through a conventional cooler. In this case, in fact, each frame may be designed to constitute, with the base, the header and a casing which bounds a space containing the corresponding outer cross-member, a supply manifold for the corresponding outer compressor cylinders.
The cross-members must be provided with guide means. A first solution consists of providing them with bearings sliding on fixed guide tubes. However, for a high-powered installation, it is more advantageous to constitute the guide means by one or several tubes fixed to the cross-member and moving in fixed bearings whose distance is equal to at least four times the diameter of the tube. If this solution slightly increases the weight of the movable mechanisms, it has on the other hand the advantage of avoiding any journal, lining and movable oil inlet and of permitting the moving mechanisms to be rendered substantially symmetrical with respect to the longitudinal axis of the machine.
The invention will be better understood on reading the description which follows of a multi-tandem machine which constitutes thereof a particular embodiment given by way of non-limiting example. The description refers to the drawings which accompany it, in which;
FIG. 1 is a view in elevation of the left-hand part of the machine,
FIG. 2 is a schematic diagram showing the arrangement of the axes of the drive cylinders and of the compressor cylinders of the machine of FIG. 1, viewed as a whole,
FIGS. 3, 4 and 5 are sectional views along the lines III--III, IV--IV, and V--V of FIG. 1.
FIG. 6 shows the machine of FIG. 1, as seen from above;
FIG. 7 is a schematic cross-section parallel to that of FIG. 3 and indicating the relative arrangement of the cruciform structure of the frame and compressor cylinders.
The machine shown in FIG. 1 comprises a mounting, an inner moving mechanism and an outer moving mechanism, as well as fixed pipes for the circulation of gases.
The mounting comprises a base 10 and an upper header 11 substantially of the same length, connected by an inner one-piece
REFERENCES:
patent: 2812894 (1957-11-01), Schweitzer
patent: 2945618 (1960-07-01), Endres
patent: 3347215 (1967-10-01), Pescara
patent: 3669571 (1972-06-01), Benaroya
Free Albert L.
Smith Leonard E.
Synnestvedt John T.
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