Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1994-03-21
1995-04-04
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Using differential pressure
G01F 122
Patent
active
054026865
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a float type flowmeter possessing an exchangeable measuring tube which is arranged between a bottom flow-through fitting and a top flow-through fitting.
A meter of this kind is basically already known form DE-OS 3 417 066. In this known meter the measuring tube is held by means of appropriate seals and a clamp means between top and bottom flow-through fittings. The axial contact pressure on the measuring tube is produced by means of a swivelable cam member which transmits the axial pressure to the measuring tube via the clamp means. It is thereby intended to facilitate the replacement of the measuring tubes whose inner walls are soiled by the medium flowing through. The contact pressure is at the same time adjusted by means of an adjusting screw on the cam member. As can be seen from the construction of this known meter, as illustrated in the appertaining figure of the drawings, a relatively large number of parts requiring adjustment to one another are needed. The seating of the measuring tube (on the top and bottom flow-through fittings) has no radial guidance and therefore cannot be regarded as optimum.
From DE-GM 7 637 539 a corresponding meter is known, in which a cap nut is provided at each end of the measuring tube. With the aid of these cap nuts the measuring tube is held between the flow-through fittings. In addition to axial fastening of the measuring tube, radial guidance at the clamping points (on the top and bottom flow-through fittings) is thereby achieved. However, a certain skill is required, particularly for the insertion of the measuring tube, with the cap nuts engaging over it, between the flow-through fittings.
Finally, from DE-GM 8 323 017 a corresponding meter is known, in which the measuring tube is connected to the flow-through fittings by means of bayonet rings. Although the measuring tubes can thus basically be replaced very quickly, here too the insertion of the measuring tube and its fastening between the flow-through tubes nevertheless require a certain skill.
The problem underlying the invention is that of further developing a meter of the type described hereinabove in such a manner that the cost of manufacture for the parts involved in the replacement of the measuring tube is as low as possible and the replacement per se requires no great skill.
The invention is explained below by way of example with reference to the figures of the drawings, in which:
FIG. 1 shows a single meter viewed from the side, in section, and
FIG. 2 shows a plurality of individual meters arranged side by side in a row.
A float type flow meter is frequently used for determining the amount of a coolant flowing per unit of time through an apparatus which is to be cooled, for example an injection mold for plastics. The transparent measuring tube is provided with an inside diameter widening from bottom to top. It is normally disposed on the coolant return side and contains a retaining cone which, in the absence of flow, sinks in the measuring tube to a depth such that it rests either in the downwardly tapered inside diameter of the measuring tube or on a special locking seat. As soon as there is a flow through the measuring tube, the retaining cone is carried upward by the flow. Because of the upwardly widening inside diameter of the measuring tube, the free flow cross-section between the inside wall of the measuring tube and the retaining cone is enlarged until a state of equilibrium is achieved between the lifting forces which the flow produces and the weight of the retaining cone. The height at which this state of equilibrium for the retaining cone is adjusted is a measure of the amount of coolant flowing through per unit of time. Appropriate calibration enables a determined rate of flow per unit of time to be allocated to every height of the retaining cone.
Since each injection mold for plastics which is to be cooled has associated with it a plurality of cooling circuits, for which, depending on cooling requirements, a different rate of flow per unit of time is needed, a pluralit
REFERENCES:
patent: 2130981 (1938-09-01), Fischer et al.
patent: 2258023 (1941-10-01), McKernon
patent: 3974857 (1976-08-01), Hehl
patent: 4245513 (1981-01-01), Clements et al.
Goldstein Herbert
Wittmann Kunststoffgerate Ges. M.B.H.
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