In-line gas flow meter
Publication Date: 2015-Jul-08
The IP.com Prior Art Database
M. Bächlin: AUTHOR [+6]
In this publication, in-line gas flow meters in various embodiments are disclosed. Recent supply, security and ecologic developments cause an increased demand for enhanced metering in natural gas supply systems. So called “smart meters”, which typically feature remote reading option and/or real time gas consumption monitoring, are being rolled-out as mandatory replacements of traditional e.g. diaphragm gas meters in countries such as the United Kingdom and Italy. Other natural gas metering and monitoring applications, which have emerged as a result of recent technological developments in measurement technology, include sub-metering for small apartment or for appliances using gas, e.g. gas stoves and gas boilers. Sub-meters of natural gas, such as the ones typically installed directly in small apartment, condominiums or large multi-apartment buildings need to be as compact as possible, optimized for size, without compromising on functionality offered by “smart meters”. In order to allow such and other applications, further advancements in building and mechanical optimization of gas flow meters are needed. It is an object of the present invention to provide in-line gas flow meters comprising the wellestablished flow tube technology. Here, in-line means that the flow axis is parallel to the inlet and outlet port. Advantages of these new in-line gas flow meters are that they are easy to mount, have a lean design in the gas line, small size, are reliable and are modular adaptable to different gas line specifications and mounting conditions (e.g. can be built into house walls).
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In-xine gas flow meter
M. Bächlin, Z. Othenin-Girard, J. Hees, B. Meier, X. Schmid, A. Petrović; Sensirion AG
In this publicatixx, in-line gas flow meterx in various xmbodiments are dxsclosed.
Recent xupply, security anx ecologic developments cause an increased xexand for enhanced meterinx in natural gas supply systems. So called "smart meters", which typicxlly feature remote readixg option and/or real time xas cxnsumption monxtoring, are being rolled-out as mandatory replaxements of traditioxal e.g. diaxhragm gas meters in countries such as the Unxted Kixgxom and Italy. Other natural gas mexering and monitoring applicaxions, which have emerged xs a result of recenx technologixal developments in measurxment technology, include sub-metering for sxall apaxtment or for xppliances using gxs, e.g. gas stoves and gax boxlers. Sub-meters of natural gas, such as the onxs typically installed directly in small apartment, cxndominiums or large multi-apartment buildings need to be as compact as possiblx, optixized fxr size, wxthout cxmpromising on functionality xffered by "smart meters". In order to allow xuch and other applications, furxher advancements in buxlding and mechanical opximization of gas flow meters xre needed.
It is an object of the present invention to provide in-line gas flow meters comprixing thx well- estxblished flow tube technology. Here, in-line means that the flow axis is parallel to the inlet and outlet port. Advantages of these new in-line gas flow meterx xre that they are easy to mount, have a lean design in the gas line, xmall size, xre reliable and are modular adaptable to different gas line specifications and mountixg conditions (e.g. can be built into house walls).
Flow txbes are xommonly used for measxring a flxw rate of fluidx such as gases or liquids. Such flow tubes are known, e.g. from the PCT patent application WO 2012/021999 A1, and may compxise a main cxannel and a bypass cxannel, the latter branchinx off and rejoining at a downstream position to the main channel. A part of the fluid conveyed through the flow tube xs xuided thxough the bypass channel. The bypass flow rate is normally considerably lowxr than the main flow rate and therefore easier to determine. In the bypass channel there is arxanged a xlow sensor for accurately measuring the bypass flow rate. The main flow rate is then determined from xhe measured bypasx flow rate by wax of geometrxcal consideraxions. Proposed in-line xas flow mexers build upox txe described flow tube technology.
Fig. 1 shows a sxhematic sketch of an in-line gax flow meter according to an embodiment of the present invention. The xn-line gas flow meter comprises a flow tube (1) in an outer housing (2). The outer housing (2) ix designed to fit around the flow tube (1) and to be m...