Gas metering
A gas flow meter, airflow technology, applied in liquid/fluid solid measurement, volume/mass flow generated by mechanical effects, measurement flow/mass flow, etc., can solve problems such as blocking household gas flow
Inactive Publication Date: 2008-12-24
SENTEC SA
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Problems solved by technology
Since the same electric field needs to be generated with an operating voltage of only a few volts, the diameter of the conduit installed in the Brain flowmeter would need to be 100 times smaller, which would significantly block the flow of domestic gas supplies
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Embodiment Construction
[0050] Fig. 1 schematically shows a gas flow meter according to a first embodiment of the present invention. The gas flow meter comprises a conduit 1 serving as a passage for a gas flow, indicated by arrow A. In this example, the catheter is a cylindrical tube with an internal diameter of 23mm. The ionization device 2 is arranged on the conduit side of the gas flow in the ionization conduit. In this example, the ionization device 2 is a 1 μCi Americium 241 radioactive source confined in silver or gold foil (of the type used in domestic smoke monitors). Source 2 typically has an emission velocity of 37000 alpha particles per second and has an extent of 3 cm in air. The ionization efficiency is 200,000 ion pairs per alpha particle, 50% of which recombine within 100ms. The radioactive source 2 ionizes the gas in its immediate vicinity to form an ionized cloud 3 which is carried through the tube 1 by the gas flow.
[0051] A modulation electrode structure 4 is provided in the ...
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A gas meter comprises a conduit (1) for passage of a gas flow A and an ioniser (2) arranged to ionise the gas flow in the conduit (1). A modulating electrode structure (4) downstream of the ioniser modulates the ion distribution in the ionised gas flow. A first detecting electrode structure (8) and a second electrode structure (9) downstream of the modulating electrode structure (4) detect the modulated ion distribution in the ionised gas flow. The modulating electrode structure (4) and the detecting electrode structures (8, 9) can be configured to generate an electrical field having at least a substantial component parallel to the direction of the gas flow. The modulating electrode structure (4) and the detecting electrode structures (8, 9) can comprise a pair of electrodes (5, 6, 10, 11), each having a plurality of apertures defined therein for passage of the gas flow. The modulating electrode structure (4) can be arranged to capture ions of one polarity, to generate an ionised gas flow comprising a majority of ions of the opposite polarity, in which case the detecting electrode structure can comprise at least one electrode (11) connected to a source of charge. Movement of the ionised gas flow relative to the electrode causes a redistribution of charge in the electrode, which generates a current indicative of the ion distribution between the electrode (11) and the charge source. The various arrangements provide a gas meter that can operate with a modulating voltage of less than (10) volts and is therefore suitable as a domestic gas meter.
Description
technical field [0001] The invention relates to the field of volumetric gas flow meters. The gas flow meter technology described here is particularly suitable for gas flow meters for residential applications. Background technique [0002] The most common form of volumetric residential gas flow meter is the diaphragm gas flow meter. [0003] This is a mechanical device that works on the principle of positive displacement, allowing a fixed volume of gas to pass through each complete cycle. Mechanical flow meters are subject to wear and tear during normal operation, which can lead to loss of accuracy over time and the possibility of eventual complete failure. The increasing popularity of Automatic Meter Reading (AMR) devices means that some form of encoder must often be used to interface with a mechanical reader so that consumption information can be read automatically. [0004] It would be desirable to provide a gas flow meter that contains no moving parts, ie a static gas ...
Claims
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IPC IPC(8): G01F1/08G01F1/704
Inventor 爱德华·格雷利耶·科尔比汉斯·乔基姆·斯坦纳基蒙·鲁索普洛斯马修·伊曼纽尔·米尔顿·斯托基西蒙·亚当·莎士比亚
Owner SENTEC SA