Detecting system for gas instrument

Abstract

The invention discloses a detecting system for a gas instrument. The detecting system for the gas instrument comprises a detecting unit and a gas pumping unit. A negative pressure pipeline and an outlet pipeline are connected between the detecting unit and the gas pumping unit. The detecting unit comprises a detection table position, a stagnation container and a sonic nozzle, wherein the detection table position, the stagnation container and the sonic nozzle are connected in sequence. The gas pumping unit comprises a vacuum pump. One end of the vacuum pump is connected with the outlet pipeline, and the other end of the vacuum pump is connected to the negative pressure pipeline. The outer side of the vacuum pump is connected with a frequency converting control device. The operating speed of the vacuum pump is intelligently controlled through the frequency converting control device, and the frequency converting control device is connected with a handheld mobile control terminal through a wireless signal device. The detecting system for the gas instrument has the advantages of being low in energy consumption, economical, environmentally friendly, accurate in measurement and high in portability through frequency conversion intelligent control.

Description

technical field [0001] The invention relates to the field of instrument equipment, in particular to a gas flow meter detection system. Background technique [0002] Standard meter method There are many methods for flow standard devices, and the gas flow standard device using the sonic Venturi nozzle (or sonic nozzle) as the standard meter is one of them. Compared with using other flowmeters as standard meters, using sonic nozzles as standard meters has many advantages, such as simple structure, stable performance, high accuracy, no moving parts, easy maintenance, long verification period (five years) and so on. The sonic nozzle method gas flow standard device is suitable for the detection and calibration of various gas flow regulators, and can detect mass flowmeters, velocity flowmeters, volumetric flowmeters, rotameters, differential pressure flowmeters or other types flow meter. [0003] For example, a standard device with a relatively large flow rate needs to use a wate...

AI Technical Summary

Problems solved by technology

The disadvantage is that when the gap between the required flow rate and the rated flow rate of the vacuum pump is large, the pipeline needs to be bypassed, otherwise the vacuum pump will also burn out

On the other hand, its pressure difference ratio is insufficient, and the highest foreign products can only reach 0.7 at present.

If the pressure loss of the verified instrument is slightly larger, the pressure difference ratio <0.85 at both ends of the sonic nozzle cannot be guaranteed, thus limiting the scope of use of the device

[0007] No matter which type of vacuum pump is used, the traditional gas meter verification device has one of the biggest and common defects: since the gas used for the verification is extracted from the outdoor atmosphere and discharged to the atmosphere, three problems arise. : One is that the temperature of the air extracted by the test cannot be controlled and is greatly affected by the outdoor temperature. Although it can be corrected ...

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