Integral flux, wind velocity sensor

Abstract

The invention relates to an integrated flow and wind speed sensor, which is integrally formed by a thermal mass flow sensor and a fluid oscillatory type flow sensor which are in series connection. The integrated flow and wind speed sensor of the invention based on two principles that thermal film platinum resistance turns cold in gas flow and is reduced by resistance, and fluidic flow sensor outputs pulse relative to the gas flow rate when being entered by the gas flow, thereby realizing integral uniformity from the sensor structure. The sensor of the invention is integrally formed by the thermal mass flow sensor and the fluid oscillatory type flow sensor which are in series connection, when the flow is relatively low, the thermal mass flow sensor can be used to measure, when the flow is relatively high, the fluid oscillatory type flow sensor can be switched to perform measuring, the sensor of the invention can measure low-flow just by employing the conventional method, and also can be used to measure high-flow with largely widened measurement range and perfect social and economical benefits.

Description

technical field [0001] The invention relates to a flow sensor used in a mine gas drainage comprehensive parameter measuring instrument, in particular to an integrated flow and wind speed sensor with thermal jet flow dual principles. Background technique [0002] With the relative reduction of oil and natural gas resources, coal, a traditional energy source, has been re-emphasized and widely used. my country is a large coal-producing country, and coal accounts for more than 70% of the primary energy composition. , this ratio will remain stable. During the mining of coal, metal and other mines, a certain amount of gas (mainly a mixture of methane, air and carbon dioxide) accumulates unevenly inside the mine and rock formations. These gases are extremely dangerous. If they are not pumped in time Or improper handling can cause underground gas "breakthrough" and gas explosion. Therefore, the monitoring of gas drainage is one of the most important items for the safety production o...

AI Technical Summary

Problems solved by technology

There are hundreds of "sub" pipes in each mining area at the coal mine site, and the flow and negative pressure fluctuations inside the "sub" drainage pipes are relatively large (flow rate from 5-500L / min), using the existing single range The flow sensor is unable to accurately measure such a wide range of flow changes

Existing flow sensors commonly used include thermal mass flow sensors and fluid vibration flow sensors (such as vortex, jet flow). The thermal principle of measuring flow has the characteristics of high sensitivity and can measure low flow (flow rate is 0-50L / min ), but poor resolution for high flow rates

The jet flow sensor has the advantages of stable performance and high measurement accuracy, but has the disadvantage of high starting flow rate (1.5m / s flow rate)

Using two sensors with different principles and different ranges to accurately measure the flow of a pipeline at the same time is also somewhat complicated from the perspective of technical implementation.

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