Air flow measuring device

专利名称：Air flow measuring device

发明人：Tsugito Nakazeki,Yoshinobu Yasuda申请号：US06/053261申请日：19790629公开号：US04285313A公开日：19810825

摘要：An air flow measuring device comprising a flow detection valve located in aconduit and a servo-mechanism operable to maintain the difference in pressure acrossthe detection valve at a control value, the servo- mechanism including a pressure-sensitive amplifier for sensing any deviation of the pressure difference from the controlvalue by means of a pressure-responsive diaphragm and producing an amplified actuatingpressure in response to such deviation and a valve actuator connected to the amplifierfor receiving the actuating pressure and operatively connected to the flow detectionvalve for positioning same with the actuating pressure, wherein a resiliently deformablebellows filled with a given mass of a gas and having an effective pressure-sensitive-areaequal to (the effective pressure-sensitive-area of the diaphragm)× (the control valueunder a reference condition of air)÷(the gas pressure in the bellows being equal to thereference pressure of air) is provided so that it is surrounded by air and that the forceproduced by the diaphragm due to the pressure difference is balanced by the resultantforce of a force due to the resilient deformation of the bellows and a force produced bythe bellows in response to alteration in temperature and pressure of air, whereby thecontrol value becomes proportional to the specific gravity of air being measured,ensuring the determination of the mass rate of flow of air past the flow detection valve

from the area of opening of the flow detection valve.

申请人：NAKAZEKI; TSUGITO,YASUDA; YOSHINOBU

代理机构：Hall & Houghton

更多信息请下载全文后查看