1, the technical level with eddy street flowmeter and orifice plate current flowmeter
Eddy street discharge advocate basic structure produces body, detecting element, signal to handle enlarge circuit composition by eddy street, the research that produces system to eddy street at present already reached quite perfect level, with trigonometry model produce body to be optimal model body, detecting element has thermal resistor, meet an emergency piece, capacitance of piezocrystal, differential, ultrasonic. Signal processing has partly a lot of already personal computer is changed. Eddy street flowmeter has installation to go to the lavatory (can install on conduit directly) , small, interchangeability runs volume by force, for a long time precision is tall, measure at most liquid, gas and steam applicably. At present the sale of the eddy street flowmeter of world market increases by degrees every year 30% the left and right sides.
Current, the state of technology of orifice plate flowmeter still is a foundation with affirmatory experience formula, 1980 international Organization for Standardization R541 and R781 two standards incorporate standard ISO5167 (1980) .
Orifice plate throttle unit because the structure is simple, cost is low, reliable wait for an advantage, it applies to all dielectric measurement almost, and to it the difference of form a complete set is pressed change send implement development is rapid, make its itself provides some inadequacy to be able to make up for.
2, eddy street flowmeter and evaluation of integral performance of orifice plate flowmeter
Orifice plate flowmeter (abbreviation orifice plate) by reduce expenditure take press fitting buy and difference to press change send implement composition, guide press a canal to need to have the measure that accompany heat to the place that freezes easily, a discharge measures return quiet sealed place is controlled for 20, following problems exist in using:
Block up easy aspic, easily, heat of easy leakage, companion causes difference pressing easily to change send implement ageing of parts of an apparatus, certain circumstance guides press a canal to need to add segregation juice, because companion heat or technology operation are flabby, , negative guide line of juice of juice of the segregation that approach a valve often differs, generation fluid column is poor, make discharge directive forbids.
Above can make capacity coefficient happening changes, measure loss of accuracy, the canal shortens guide press a canal to change difference pressing send implement direct installation is on conduit, but the dead band that still has flow.
Eddy street flowmeter (abbreviation eddy street) have 3 only quiet sealed place, not easy leak, without going from place to place dead band, do not need to accompany hot heat preservation, do not suffer a fluid to be spent again, temperature, pressure, wait for an influence with viscosity, capacity coefficient is long-term and changeless.
But eddy street is in when oscillatory circumstance is used, can make discharge is measured forbid. Current, the eddy market that defies vibration shape already was rolled out on the market, will overcome vibration to measure forbidden effect to discharge.
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