Discharge of throttle unit type surveys a system is to point to use orifice plate, nozzle, civil Qiu Li is in charge of those who measure flow of full round canal to survey a system. This system is average by throttle unit, difference gauge and data processing implement (evolution integrator or computer) composition. The characteristic that this kind of discharge surveys a system is:
1 principle and academic research are very mature;
2 standardization rate is higher, have GB/2624 and ISO5167 standard file;
3 structures are simple, cost is low, uphold use charge low;
4 pairs of environments get used to ability strong;
5 if defend management,can get taller accuracy correctly.
The flowmeter of other form cannot compare these characteristics, because this is shedding meter of flow of type of the throttle unit in measuring a volume to have higher proportion, estimation is in 80% the left and right sides. Although have a few,in recent years new-style flow meter puts in the market, but, as a result of the structure, cost, the reason such as use condition, still cannot shake meter of flow of throttle unit type measures medium place in discharge. Because this is measured to this kinds,use the problem that remains automation appearance professional to must take seriously with care and maintenance correctly of the system.
Discharge of type of one throttle unit measures those who measure a system to safeguard use current situation
The discharge of throttle unit type in be being used at present surveys a system, because accept the restriction that maintains level of personnel major technology, manage and safeguard what be confined to pair of hardware only for the most part. Main job content nothing more than pulse of examination throttle unit guides door of the cut down that approach a valve has jam without leak, difference gauge and data processing implement the job is regular have desired result to its regularly. If above safeguards an examination to did not discover a problem, although the system shows data has apparent deviation, also maintaining a system commonly is normal.
Because will be engaged in shedding the management that measures a volume to work for years, I think the use that surveys quantity system to discharge of throttle unit type is safeguarded, manage and be being safeguarded what be confined to pair of hardware is far insufficient, more important is to want to undertake to the system soft safeguard. Alleged soft safeguard, the operating mode parameter that measures a system to move to discharge of throttle unit type namely undertakes dogging analytic study computation, undertake correction to technical parameter of the system according to computational result. Soft safeguarding is a process that makes systematic technology parameter is close to actual operating conditions.
2 soft maintenance necessity
Survey a system to discharge of any type of a throttle unit, its design plan is a basis to want the medium sort that just offers, temperature, pressure, discharge, the calculative of operating mode parameter such as conduit geometry dimension. The parameter computation design that needs to just be offerred according to a group namely creates a throttle unit, move below the operating mode that this throttle unit is designing computation to use only, the inaccuracy that systematic ability assures to measure is spent surely in formulary limits. If use operating mode deviate actually to design operating mode, the system measures data to be spent surely with respect to unwarrantable inaccuracy in formulary limits. And the discharge of throttle unit type in be being used actually surveys a system much is much with the design operating mode differs, some even six to one. Must undertake to its accordingly soft safeguard, and this kind soft safeguard should perforative the whole process that uses at the system.
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