Measuring and testing – Volume or rate of flow – Mass flow by imparting angular or transverse momentum to the...
Patent
1982-01-06
1984-05-29
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Mass flow by imparting angular or transverse momentum to the...
7386183, 374 39, G01F 182, G01N 1706
Patent
active
044507267
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The present invention relates to a measuring apparatus, the operation whereof is based on the flowing of fluid, gas or other such medium, the apparatus comprising a flow pipe, a rotor placed coaxially therein, a rotor tachometer or equivalent member, and means for guiding the flow, there means being located before the rotor in the principal flowing direction.
The measuring apparatus of the invention is meant to be employed for measuring one or several parameters of the medium substance, such as volume flow, mass flow, content, composition or other similar conditions.
In the prior art meters are known for measuring various types of flow. Such meters comprise a rotor fitted coaxially within the flow pipe, and a control blade arrangement positioned fixedly in front of the rotor. The blade arrangement deviates the flow from the principal flowing direction. By means of the control blade arrangement, the directly proceeding flow receives a screw-shaped speed component which, in its turn, rotates the rotor. The rotating speed of the rotor is counted by a tachometer or revmeter, and from the reading of the revmeter the flowing speed and further the volume flow can be calculated or read directly by means of a suitable electronic calculator. Other quantities depending from the characteristics of the flowing medium cannot be directly measured.
In the German Patent Applications nos. DE-OS 1 931 498 and DE-OS 2 010 390 heat amount meters are presented where the liquid flows through a turbine provided within the flow pipe. The changes in the liquid temperature suitably affect the turbine blades which are made of bi-metal, by changing the angle of these blades. Consequently the change in the temperature also causes a change in the geometry of the blades, and further in the rotating speed of the turbine.
One of the drawbacks of the above described meters is the relatively heavy structure of the turbine. Moreover, it is in practice diffficult to make such turbines react with desired accuracy to the changes in the temperature. The measuring apparatus of this type cannot be employed for measuring quantities other than heat amount.
Another drawback of the above described apparatus is the fact that the slanted position of the turbine blades directs to the turbine, a remarkably great axial power component resulting from the flow, and this power component has to be received by means of bearings. This reduces both the sensitivity and the lifetime of the apparatus.
In the published Finnish Patent Application no. 793299 a heat amount meter is presented where the turbine or the rotor and the bimetallic guide member reacting to changes in the temperature, are constructed separately, in which case some of the drawbacks of the above described German Patent Applications can be avoided. However, the manufacturing of the control blade arrangement of bimetal is arduous and its sensitivity leaves room for criticism.
SUMMARY OF THE INVENTION
The purpose of the present invention is, among other things, to eliminate the above mentioned drawbacks and to realize a flow-operated measuring apparatus which is appropriate for measuring various liquid and gasiform medium substances. This is achieved by means of the characteristic features of the invention. Accordingly an object of the invention is to provide a measuring device which comprises a flow conduit for passing a flowing medium in a flow direction, a rotor rotatably mounted in the flow conduit shaped to rotate with medium flowing at an angle to the flow direction, rotation counting means associated with the rotor for counting the rotations of the rotor, a director having at least one member extending into the medium flow with downstream lateral side surfaces, a controller having at least one member extending in the medium flow with upstream lateral surfaces, the director and collector mounted for relative rotation therebetween, defining at least two paths between respective lateral side surfaces thereof which change in cross-section with changing rela
REFERENCES:
patent: 2620659 (1952-12-01), Karcz
patent: 3308662 (1967-03-01), Maurer
patent: 3439538 (1969-09-01), Farrell
patent: 3440877 (1969-04-01), Kovats
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