Ultra-large diameter sonic nozzle block type gas flowmeter calibrating device

Abstract

The invention discloses an ultra-large diameter sonic nozzle block type gas flowmeter calibrating device. The ultra-large diameter sonic nozzle block type gas flowmeter calibrating device comprises a gas flow calibrating part located above the ground and a gas discharge part located under the ground; the gas flow calibrating part comprises a U-shaped header which is divided into front and rear two sections; a detection pipeline is connected to the front section of the U-shaped header, while sonic nozzles are connected to the rear section of the U-shaped header; the underground gas discharge part comprises a first gas pressure stabilizing tank which is provided with a plurality of outlets; each outlet is connected to a cyclic gas discharge selecting channel; the cyclic exhaust selecting channel is provided with a water discharge channel and a gas discharge channel; each sonic nozzle is connected to one first nozzle outlet header which is connected to the first gas pressure stabilizing tank. The ultra-large diameter sonic nozzle block type gas flowmeter calibrating device has the advantages that the space is effectively utilized, the noise quantity of the space of the part above the ground is reduced and the working environment is improved, and furthermore, the energy consumption is greatly reduced and the calibration result is accurate.

Description

technical field [0001] The invention relates to a gas flowmeter verification device, in particular to a super-large-caliber sonic nozzle group-type gas flowmeter verification device suitable for the verification of various large-caliber flowmeters. Background technique [0002] Existing verification devices are generally gas flowmeters with small verification calibers. With the implementation and construction of gas trunk lines, urban gas has entered a period of rapid development, and more and more ultra-large-caliber gas flow meters have been applied to natural gas pipelines; the diameter of natural gas pipelines is very large, and the accuracy of gas flowmeters has an impact on the detection results Very large, small-caliber gas flowmeters are inconvenient to use, waste a lot of energy consumption, and the large-caliber gas flowmeters take a long time to verify and start, making traditional small-caliber gas flowmeters unable to meet the needs of large-caliber gas flow...

AI Technical Summary

Problems solved by technology

[0002] Existing verification devices are generally gas flowmeters with small verification calibers. With the implementation and construction of gas trunk lines, urban gas has entered a period of rapid development, and more and more ultra-large-caliber gas flow meters have been applied to natural gas pipelines; the diameter of natural gas pipelines is very large, and the accuracy of gas flowmeters has an impact on the detection results Very large, small-bore gas flowmeters are inconvenient to use, waste a lot of energy consumption, and the large-bore gas flowmeters take a long time to start the calibration, making traditional small-bore gas flowmeters unable to meet the needs of large-bore gas flowmeters

[0003] In the existing technology, the sonic nozzle is often selected as the standard meter because of its high accuracy, good repeatability, stability and reliability. According to the survey, there are hundreds of gas flow devices with the sonic nozzle as the standard meter in China, and the installation methods are all different. The large-space type is selected; if the large-space installation is used, the nozzle installation is not in place, resulting in unstable air flow, and uneven temperature distribution under small flow conditions, which will lead to inaccurate test results

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