Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1983-05-12
1985-07-02
Yasich, Daniel M.
Measuring and testing
Volume or rate of flow
Expansible chamber
92 121, G01F 318
Patent
active
045260320
DESCRIPTION:
BRIEF SUMMARY
This invention relates to apparatus for measuring liquid quantities, having cylinders that are arranged in a housing, a piston reciprocable in each cylinder, and a crankshaft to which the pistons are connected; and the invention is more particularly concerned with a liquid quantity measuring apparatus having two laterally opposite cylinders, the pistons of which form separate working chambers towards the outer dead center points and form a common working chamber between them, wherein the crankshaft is formed in two parts and the pistons are connected by means of a linkage with crankpins on the crankshaft that are located eccentrically to its axis and at such positions around its axis as to define with that axis an angle of 60.degree. to one another, and wherein an upper one of the crankshaft parts is connected above the cylinder housing with a rotary valve which, by way of control passages formed therein, guides the liquid to be measured periodically and sequentially to the separate working chambers and also directs returning liquid to an outlet in the housing.
An apparatus of this general type, which is also called a fluid measuring motor, is known from Swiss Pat. No. 338,029. In this, the cylinders are arranged in a V at an angle of 120.degree. and operate on a common crankpin. For guiding pistons that operate in a staggered arrangement, a substantial construction expense is necessary, and it is also necessary to provide correspondingly expensive equipment for the manufacture of such liquid measuring motors. It happens to be especially disadvantageous that because of the common crankpin, neither of the two pistons can be individually adjusted in its stroke.
The same also applies in principle to a liquid measuring motor of the construction known from West German published patent application No. 22 51 304, which comprises at least two pairs of measuring cylinders in a star-shaped housing, having their pistons connected by means of flexible piston rods with a common crankpin. Piston stroke adjustment by changing the crankpin eccentricity relative to the axis of the crankshaft operates simultaneously upon all of the pistons or piston pairs uniformly.
From West German Pat. No. 713,374 there is known a piston-type liquid measuring device with four crosswise arranged, pairwise opposite cylinders, wherein the pistons of each cylinder pair are connected, by means of a connecting rod for each, with a common crankpin of the crankshaft, which is guided by means of a bearing roller in two slide guides that extend perpendicularly to one another.
With these last mentioned known devices, too, a substantial manufacturing cost is necessary, and there does not exist the possibility of being able to change the stroke of one of the pistons.
Finally, liquid measuring motors with two cylinders are known in which the cylinders are arranged opposite one another relative to the crankshaft axis, wherein the pistons operate on a two-throw crankshaft, for the manufacture of which a correspondingly high construction cost is necessary.
The invention solves the heretofore existing problem in apparatus of the above-described class for measuring liquid of being able to combine the advantage of a two-cylinder liquid measuring motor of simple manufacture with the advantages of a two-part crankshaft, and of providing along with this the possibility of being able to change the piston stroke of one of the two pistons by adjustment of the crank radius, whereby an especially fine adjustment of the throughflow quantity for one cycle is obtained.
This objective is obtained according to the invention in that the linkage that connects the pistons and the crankpins with one another is formed as mutually guiding parallel cross-slides, that the crankpins are carried by a guide disc that is arranged in spaced relationship between the ends of the two parts of the crankshaft, and that on a bottom one of the crankshaft parts there is provided a device for adjusting the stroke of one piston by means of a hollow shaft which is eccentric and rotatable and wh
REFERENCES:
patent: 1915663 (1933-06-01), Granberg
patent: 1971559 (1934-08-01), Granberg
patent: 1986747 (1935-01-01), Parker
patent: 2337310 (1943-12-01), Chrisman et al.
patent: 2565287 (1951-08-01), Willson
patent: 2667784 (1954-02-01), Batchelder
patent: 2760384 (1956-08-01), Chrisman
Deutsche Geratebau GmbH
Nilles James E.
Yasich Daniel M.
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