Gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzles

Abstract

The invention provides a gas meter flow fluctuation type mechanical endurance test system adopting sonic nozzles. The system comprises a front-end valve, a plurality of tested gas meters, an inlet manifold, an electromagnetic pneumatic valve group, a sonic nozzle group, a single chip microcomputer, an outlet manifold and an air compressor, a plurality of tested gas meters are connected in series or in parallel between the inlet manifold and the front-end valve; the electromagnetic pneumatic valve group comprises a plurality of electromagnetic pneumatic valves electrically connected with the single-chip microcomputer. The sonic nozzle group comprises a plurality of sonic nozzles which are arranged in pairs with the electromagnetic pneumatic valves and are different in standard flow, the electromagnetic pneumatic valves and the sonic nozzles which are connected in pairs are connected between the other side of the inlet manifold and one side of the outlet manifold in parallel, and the other side of the outlet manifold is connected with the air compressor. According to the system, a plurality of sonic nozzles with different standard flows are adopted as a flow control mechanism, the sonic nozzles with different standard flows are switched by quickly opening and closing the electromagnetic pneumatic valve, the flow change of gas flowing through the tested gas meter is realized, andthe flow control precision is high.

Description

technical field [0001] The invention relates to the technical field of metering, in particular to a gas meter flow fluctuation mechanical durability test system using a sonic nozzle. Background technique [0002] Energy is the most important material basis for human survival and development. With the optimization and adjustment of my country's energy structure, natural gas (including coal gas, liquefied petroleum gas, etc.) is an important primary energy source, and its proportion in my country's energy consumption continues to increase. Correct and reasonable measurement of natural gas flow is one of the important links in natural gas utilization. [0003] Among the end users of natural gas, household users occupy an absolute dominant position relative to industrial and commercial users. At present, the vast majority of domestic gas users still use membrane gas meters as gas metering instruments. The gas meter measurement characteristic of domestic gas users is that the t...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the flow fluctuation cycle test device of the existing household gas meter durability test, the manual valves at the front and rear ends of the measured gas meter are used to manually adjust the flow when the flow is adjusted, and the three pneumatic valves at the head or tail of the pipeline are quickly opened. Fluctuation and switching of the flow can be realized by closing and closing, so that although it can meet the test requirements of flow fluctuation, the overall use process is relatively cumbersome, and the technical problem of the flow control accuracy of the measured membrane gas meter is not high. The present invention provides a A gas meter flow fluctuation mechanical durability test system using sonic nozzles. The test system utilizes the constant standard flow rate of a single sonic nozzle, and uses multiple sonic nozzles with different standard flow rates to form a sonic nozzle group, and uses electromagnetic valves to control pneumatic valves. The opening and closing of the sonic nozzles with different standard flows can be quickly switched to realize the flow fluctuation of the gas meter under test.

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