Commutator of water flow standard device and commutation method thereof

Abstract

The invention discloses a commutator of a water flow standard device and a commutation method of the commutator. The commutator comprises a commutation nozzle, a first flow divider, a first commutation flow channel, a second commutation flow channel, a commutator timing guide rod and an optical-electrical converter. The commutator timing guide rod and the optical-electrical converter are matched with each other, the commutator timing guide rod is fixedly connected with the first flow divider, a second flow divider is arranged below the first commutation flow channel and the second commutation flow channel, the inside of the second flow divider is provided with a first flow dividing chamber, a measuring chamber and a second flow dividing chamber isolated with each other, the first flow dividing chamber and the second flow dividing chamber are respectively arranged on two sides of the measuring chamber, the measuring chamber, the first flow dividing chamber and the second flow dividing chamber are respectively provided with a water inlet and a water outlet, the water inlets of the first flow dividing chamber and the water inlet of the second flow dividing chamber respectively correspond to the water outlet(s) of the first commutation flow channel and / or the water outlet of the second commutation flow channel, and the bottom of the measuring chamber is provided with the water outlet. With the realization of 'swap in / swap out in the same direction' of the commutator, the invention improves the measuring accuracy of the water flow standard device.

Description

technical field [0001] The invention relates to a commutator in a water flow standard device and a commutation method thereof. Background technique [0002] In current metering technical institutions at home and abroad, there are mainly two types of commutators used in water flow standard devices: one is a closed commutator; the other is a "pants" open commutator. These two commutators meet the value transmission requirements in the current detection and verification to a certain extent, but with the development of liquid flow measurement technology, the above-mentioned commutators can no longer meet the increasingly high measurement accuracy of instruments. Therefore, more and more problems are exposed in use. For example, the water flow disturbance problem of the closed commutator, when the commutator suddenly changes direction, the flow velocity and pressure of the water flow will change sharply, resulting in a water shock wave, which will propagate along the pipe to the...

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Problems solved by technology

In fact, when the flow rate is different, the flow velocity distribution of the water flow ejected from the commutator nozzle is also different. If the pulse trigger position is adjusted according to the flow velocity distribution at a certain flow rate and placed at a fixed position, the flow rate will be reversed at this flow rate. The uncertainty caused by the commutator will be small, but at other flows, the uncertainty caused by the flow velocity distribution and the pulse trigger position will be greatly increased, and the method of continuously adjusting the pulse trigger position according to different flows is not effective. Feasibility, so it is difficult for this kind of commutator to realize A+F=C+D, so there is a large error between the average flow and the actual flow in one cycle of commutator switching in / out, which brings to a larger uncertainty

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