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3. 发明授权

US3729997A Liquid level sensor 失效
标题翻译：液位传感器
公开(公告)号：US3729997A
公开(公告)日：1973-05-01
申请号：US3729997D
申请日：1971-12-27
申请人： LUKE O
发明人： LUKE O
IPC分类号： G01F23/16 , G01L5/18 , G01L13/02 , G01L15/00
CPC分类号： G01L5/18 , G01F23/167 , G01L13/025 , G01L15/00 , Y10T137/2409 , Y10T137/7287
摘要： A device of the gas-bubbling type for determining the level of a body of liuqid comprises a dual-diaphragm, multiplying lever arrangement whereby the pressure necessary to effect bubbling is multiplied or amplified to a higher pressure which can be read directly as hydrostatic head and/or used to operate a control switch. The sensor comprises two chambers, one at a low and the other at a high pressure. Each chamber has like diaphragms exposed to ambient pressure and connected by a lever mechanism whereby the movement of the low pressure diaphragm causes an opposite and greater movement of the high pressure diaphragm. The low pressure chamber receives the pressure necessary to effect bubbling through a conduit placed in the body of the liquid, the level of which is to be measured. The high pressure chamber receives instrument air (or other control gas) through a regulating valve operated by the high pressure diaphragm, and a small amount of air is continuously passed from the high pressure chamber through a throttling or needle valve into the low pressure chamber, and thence to the bubbler conduit in the liquid. Because the control pressure is taken from the high pressure side of the sensor, a regular commercially available pressureoperated switch can be used with good results. Springs are not required to load the diaphgram. Instead, the sensor operates by mechanically balancing two pressures without the aid of springs, making it very sensitive and accurate, and the diaphragms can withstand over pressures without rupturing.
摘要翻译：用于确定液体体积水平的气体起泡型装置包括双隔膜，乘法杆装置，由此将进行起泡所需的压力乘以或放大到更高的压力，该压力可直接作为静水压头读取， /或用于操作控制开关。

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