Dispensing – Floating piston with plural or alternate discharge – With discharge volume varying means
Patent
1990-04-10
1992-03-03
Huppert, Michael S.
Dispensing
Floating piston with plural or alternate discharge
With discharge volume varying means
222273, 222404, G01F 1100
Patent
active
050924940
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE ART
The invention relates to apparatuses for metering fluid.
BACKGROUND ART
Known in the art is an apparatus for metering fluid comprising a measuring chamber having a free piston, the end spaces of the chamber being connected to a distributor of flows of the metered fluid, and a batch corrector having an abutment provided in the first end space of the measuring chamber and connected to a control unit. The batch is corrected by limiting stroke of an auxiliary plunger provided inside the free piston by moving said abutment (SU, A, 1219924). While this metering apparatus ensures a high enough metering accuracy, it is rather complicated in structure and is of a low reliability in operation.
Known in the art is an apparatus for metering fluid having a batch controller and a rotor accommodated in a fixed sleeve. The sleeve and the rotor have radial ports for the admission and discharge of metered fluid connected to respective pipelines. The inner passage of the rotor is closed of the ends thereof and is divided into measuring chambers by free pistons mounted therein. The measuring chambers are capable of regularly communicating with the radial ports and their number is equal to the number of discharge passages. One of the end sides of the inner passage of the rotor is closed by means of an abutment which is movable in the passage and is operatively connected to a mechanism for its movement to form a batch controller (cf. V. V. Bekman, Racing Cars. Leningrad. Mashinostroenie Publishing House. 1980. pp. 147-149). The latter is in the form of a sophisticated mechanical system consisting of a number of cooperating parts so as to lower reliability and response speed owing to inertia of the system.
DISCLOSURE OF THE INVENTION
The invention is based on the problem of so constructing an apparatus for metering fluid as to have a simple design ensuring actuation of the apparatus following a comparatively weak control signal with high reliability and accuracy.
This problem is solved by that in an apparatus for metering fluid comprising a casing accommodating a rotor having a closed interior space which has measuring chambers with free pistons, each having a port regularly communicating with a metered fluid supply line and a passage for a metered discharge of fluid, and a batch controller, according to the invention, the interior space of the rotor is divided by partitions into measuring chambers each accommodating a free piston dividing the measuring chamber into a metering space and a control space located on either side of the piston, the batch controller having a variable-capacity space communicating with all control spaces of the measuring chambers which are connected in parallel with one another.
This apparatus has a very simple mechanical system wherein the number of mechanically cooperating parts is minimized so as to ensure high response speed and accuracy. The hydraulic control of the apparatus also contributes to a better accuracy and higher response speed.
It is preferred that the variable capacity space be provided with a piston, and the piston space thereof communicate with the control spaces and the piston rod space communicate with the fluid supply line, the piston being axially biased by a spring on the side of the piston rod space.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features and advantages of the invention will be better understood from the following detailed description of its specific embodiment illustrated in the accompanying drawings, in which:
FIGS. 1 a, b, c, schematically show, in section, an apparatus for metering liquid in three consecutive positions of a piston in each chamber;
FIG. 2 is a sectional view taken along line II--II in FIG. 1a;
FIG. 3 is a sectional view taken along line III--III in FIG. 1.
PREFERRED EMBODIMENT OF THE INVENTION
An apparatus for metering liquid comprises a casing 1 comprising a fixed sleeve which accommodates a cylindrical rotor 2 rotated by a drive (not shown) and which is in the form of a cylinder having an interior space clo
REFERENCES:
patent: 2137384 (1938-11-01), Browne
patent: 2883088 (1959-04-01), Downing
patent: 3709205 (1973-01-01), Downing
I.B.M. Technical disclosure Bulletin, "Hydraulic Arrangement" by G. W. Scott, May 1962.
V. V. Behman, Racing Cars, Leningrad, Mashinostroenic Publishing House, 1980, pp. 147-149.
Huppert Michael S.
Pomrening Anthoula
Tselevoi Nauchno-Tekhnichesky Kooperativ "Stimer"
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