Detector for correcting measuring accuracy of sonic nozzle of diaphragm gas meter

Abstract

The invention discloses a detector for correcting the measuring accuracy of a sonic nozzle of a diaphragm gas meter. The detector consists of a photoelectric acquisition device and a photoelectric coder, wherein the photoelectric acquisition device comprises a base, a photoelectric sensor arranged in a groove of the base, and a permanent magnet arranged in one side of the base; the photoelectric coder comprises a photoelectric coding disk connected to the end of a rotating shaft in a matched mode, and annular magnetic steel arranged in the middle of the rotating shaft; and four radial strip-type notches are formed on the edge of the photoelectric coding disk at equal intervals. The distance between the coding disk of the photoelectric coder and a meter body is greatly shortened, so that the phenomenon that the photoelectric coder swings in the process of operating the gas meter to be detected is avoided; the photoelectric coder is provided with the notches, so that the phenomenon thata signal is instable in the data acquisition process is avoided; the distance between an infrared transmitting tube and an infrared receiving tube of the photoelectric acquisition device is small, sothat the signal is stable and reliable; and the repeated detection process is reduced by 91 percent, work efficiency is improved by 33.4 percent, and the first pass yield of the product is improved to 99.7 percent.

Description

technical field [0001] The invention relates to a metering accuracy correction device for a gas meter, in particular to a detector for correcting the metering accuracy of a sonic nozzle of a membrane gas meter. technical background [0002] Commonly used membrane gas meter metering accuracy calibration adopts photoelectric collector and photoelectric encoder. The principle is: after the computer sends the control signals of small flow, medium flow and large flow, the control valve of the corresponding flow is automatically opened, and the gas meter to be checked starts to run; When one of the two branches, the infrared light emitted by the photoelectric collector will be reflected back and received by the photoelectric collector, which is counted as a pulse signal. When the inspected gas meter runs a circle, the photoelectric collector will collect four pulse signals and send them to the computer, and the computer will calculate the time of the inspected gas by calculating ...

AI Technical Summary

Problems solved by technology

Therefore, the error data calculated by the computer will have deviations, and the gas meter under inspection cannot be adjusted to the error accuracy specified by the state through the selection of gears, resulting in an increase in the repeated inspection process, low work efficiency, and a one-time pass rate of the product. not tall

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