Combined container type gas flow detection device by pVTt method

Abstract

The invention discloses a combined container type gas flow detection device by the pVTt method. The gas flow detection device comprises two or more standard containers, a buffer container I, an intelligent collecting system and a control system. Each standard container is provided with an inlet end valve, a valve for combination and selection and an outlet end valve. Inlets of the outlet end valves serve as installation ports of detected flow meters. All the valves for combination and selection are mutually communicated. The outlet end valves are communicated with the buffer container I. The intelligent collecting system collects pressure p, temperature T and inflating time t in the standard containers before inflating and after inflating and pressure p, temperature T and inflating time t at installation ports of the detected flow meters. The control system is used for controlling all the valves to be opened or closed. According to the combined container type gas flow detection device by the pVTt method, the standard containers are adopted to be independently or randomly combined into different standard containers, and a working gas source and a pressure, temperature and time collecting system are shared. The range of detection flow is enlarged by more than 2n-1 times compared with a single container in the prior art, wherein n is the number of the containers. In this way, installation cost is greatly lowered, and detection efficiency is improved.

Description

technical field [0001] The invention relates to a gas flow detection device, in particular to a container combined pVTt method gas flow detection device. Background technique [0002] The pVTt method gas flow detection device is a widely used primary gas flow standard metering device and equipment. It has a high level of accuracy, and the measurement uncertainty U can reach 0.07% or higher. Venturi is usually used as a secondary standard. Primary standard devices and equipment for traceability of critical flow flowmeters such as nozzles and sonic nozzles. With the improvement of gas flow detection technology and the widespread use of civil and industrial gas flowmeters in various industries, the demand for pVTt method gas flow detection devices is also increasing. The current pVTt gas flow detection device has the following limitations: (1) There is only one standard container; (2) The volume of the standard container is small, and the maximum flow value is small; (3) The r...

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Problems solved by technology

The current pVTt method gas flow detection device has the following limitations: (1) There is only one standard container; (2) The volume of the standard container is small, and the maximum flow value is small; (3) The flow range that can be verified is not wide and stipulated For a certain range; (4) Each device has only one turndown ratio and flow range, occupies a large area, and consumes a lot of power for the working gas source (generated by a vacuum pump or compressor); (5) Low detection efficiency

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