Aug 31 2016

Common types of meter and how it works

Water meter on the water pipe, the water meter dial arranged along an arc of several small pointer, Central has a small red triangle, unscrew the faucet when the water flow when the red triangle will turn up. As for those little hands, regardless of the water does not flow almost motionless.
The dial also says the words “m3″, namely cubic meters of meaning. That is, the reading table in units of cubic meters. Because each cubic meter of water happens to be a ton of reading it is directly tonnes, so water can be easily read by the total amount of water (tonnes) calculated.
So what the meter works is it? Actually very simple, because the meter housing is fixed, its internal volume is fixed, while the water is flowing, it pushes a rotating impeller, whenever the impeller rotates in a circle, there is a constant volume of water flowing through. Therefore, if the number of turns of the rotation of the impeller cumulative down, multiplied by the constant volume, you can get the total amount of water flowing through.
We have clear principles, then look at the specific water meter inside what it is, because in order to prevent users from cheating, have seals on the cover, not allowed to open.

Common types of meter and how it works

Common types of meter and how it works

Common types of meter and how it works
Internal structure from outside to inside the meter housing can be divided into the sleeve, the inner core of the Big Three. Housing is cast iron, the water came out from the inlet through the lower portion of the annular space of the housing, here called “Under the donut.” Above this annular space has “the donut” and outlet connected. Bottom of the sleeve there is a small hole with a filter, filter out debris in the water. There are two rows of the upper and lower side of the sleeve hole, the position of the hole coincides with the upper and lower ring chamber housing front, obviously, the lower is the water hole, the row is the water hole. Of particular note is that the two rows of holes are along the circle tangential direction at an angle to play, it works as shown in the animation. Note down two rows of holes opposite direction. Water flows from the lower row of holes into the tangential direction, is bound to form a revolving flow, which for the water meter work is very important.
Impeller shaft vertically upwards to the middle, there is a small gear shaft above, and use it to “Decimal gear” engagement, the purpose of the cumulative number of revolutions. Role “Decimal gear” is the single digits whenever gear turn ten laps, ten digit gear on the revolution. In other words, the single digits gear revolution, tens gear to turn out the circle. Single digits gear is active one, is sufficient to drive the tens gear. Virtually every decimal one gear complete with two pairs, so that the rotation in the same direction in which a pair transmission ratio is 9:30, and the other pair is 10:30, two pairs connected in series, the overall ratio is this the product of the two, i.e., 0.099999, can be approximated as 0.1.
KeyWords: Water meters|household water meter
On this basis, if you want to read the seven digits (the decimal point before reading four black graduation, three decimal places read red scale), you have to use 12 pairs of gears. Plus some other purpose, in the middle of this small space to squeeze in 18 axes and 34 gears, can also be regarded as a high-density mounting.

Website: http://www.asmeter.com/