Measuring and testing – Volume or rate of flow – Expansible chamber
Patent
1984-07-05
1986-09-09
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Expansible chamber
73239, 119 1414, G01F 316
Patent
active
046101632
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for metering the volume of a fluid, preferably in connection with milking, comprising a metering chamber in which a piston means is reciprocatable between two end positions, each piston-stroke corresponding to a certain volume, and the chamber being in connection with a fluid inlet conduit and a fluid outlet conduit on each side of the piston, each of said conduits being provided with a shut-off valve, and the piston being adapted at each of its end positions to activate a means which is adapted to initiate adjustment of the shut-off valves.
When milking cows there is a wish to meter the milk delivered by the cows. In this connection a usual way is to collect milk from one or several cows in a so called recorder-receptacle, whereafter the content of the receptacle is read off according to a graded scale on the receptacle. When emptying the receptacle a valve is manually opened so that the milk can be delivered from the receptacle to a collecting conduit. After finished emptying the manual valve is shut and the recorder-receptacle is again supplied with milk.
The present recorder milking system has at least two disadvantages. Firstly, a valve often hard to find and hard to adjust is manually opened and shut when the recorder-receptacle shall be emptied and filled, respectively. Secondly, it can often be hard to read off the volume in the recorder-receptacle due partly to the position of the receptacle (parallax-error), partly to the fact that the receptacle can easily be made dirty, and partly to the fact that there is often foam on the milk surface.
Therefore, there have been wishes about a cheap but yet reliable system for metering the milk at recorder milking.
This invention intends to make these wishes possible.
According to the invention that is achieved by the fact that the apparatus comprises means adapted to adjust the shut-off valves by means of vacuum and atmospheric air.
By the invention it will be possible to use the existing system for the operation of the milking plant for governing the functions of the milk meter.
Swedish patent No. 380.347 and U.S. Pat. No. 3,073,159 disclose both apparatuses of that kind mentioned in the introductory part of the specification. Both these apparatuses, however, distinguish from this invention regarding the governing of the functions of the milk meters. Thus, the functions according to the Swedish patent are governed in an electric way while the functions according to the US patent are governed by means of a pressurized medium.
A preferred embodiment of the invention is described below with reference to the accompanying drawings, in which
FIG. 1 shows a schematic sketch of the apparatus during the milking phase,
FIG. 2 shows the apparatus during the emptying phase,
FIG. 3 shows the apparatus at shut-off,
FIG. 4 shows the apparatus at cleaning, and
FIG. 5 shows a gable wall of the metering cylinder,
FIGS. 6a-6c show a holder for the magnet in the gable wall, and
FIG. 7 shows one of the shut-off valves of the gable wall in section.
Referring to FIGS. 1-4 the reference marks 1-14 relate to the following details:
Moreover, in FIGS. 1-4 there are drawn a number of A. With an A at a detail is meant that the detail referred to has a connection with the atmosphere, which connection in certain cases can be closed.
In FIGS. 1-4 a line V is also shown which is in connection with the ordinary vacuum line of the system and is accordingly constantly under vacuum. Moreover, in the figures points of intersection, i.e. places where a line has a connection with another line, have been marked with red.
The thick lines in FIGS. 1-4 contain vacuum, while the thin lines contain atmospheric air. Furthermore, the shadowed parts of valves and relays indicate that vacuum exists there, while the light parts indicate atmospheric pressure.
Each vacuum relay comprises three chambers RI, RII and RIII. In this connection the chambers RII and RIII are separated by means of a membrane. In this membrane one end of a shaft is fastened, the other end of whic
REFERENCES:
patent: 3073159 (1963-01-01), Glasgow
patent: 3439706 (1969-04-01), Barrett
patent: 3657925 (1972-04-01), Gross
patent: 4053084 (1977-10-01), Wilde
patent: 4192185 (1980-03-01), Keilholz
patent: 4476719 (1984-10-01), Millar
Alfa-Laval Agri International AB
Goldstein Herbert
Hapgood Cyrus S.
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