Peripheral sampling differential pressure sensor for gas flow collection

Abstract

The invention discloses a peripheral sampling differential pressure sensor for gas flow collection. The peripheral sampling differential pressure sensor comprises a front flow pipe, a rear flow pipe and a connecting valve. The connecting valve is connected with front and rear flow pipes in the middle; the inner ring of the connecting valve is provided with a plurality of air inlets for airflow topass through; two annular flow cavities which are isolated from each other are formed in the connecting valve, an integrated buckle is arranged on the connecting valve, two pressure taking openings are formed in the two annular flow cavities, and the two annular flow cavities are communicated with the inlet end and the outlet end through air inlets formed in an inner armlet of the connecting valverespectively. The invention has the advantages that the flow value in the breathing process is measured in a gas pressure difference mode, the two annular flow cavities are isolated from each other,and cross infection is avoided; porous pressure sampling is adopted, components are reliable, and damage to oxygen components is small; peripheral multi-hole pressure taking is conducted, and pressuretaking is uniform; the pipe is smooth and free of obstacles, airflow obstruction is small, and airflow flowing is not damaged; sampling and pressure tapping channels are separated, and the influenceon flow velocity measurement accuracy is small.

Description

technical field [0001] The invention relates to the technical field of gas flow measurement, in particular to a peripheral sampling pressure difference sensor used for gas flow collection. Background technique [0002] The flow sensor is used in the cardiopulmonary exercise test system (CPET). The system measures the value by collecting the flow difference of the breathing gas for diagnosis by the doctor. The differential pressure sensor is a common flow sensor at home and abroad. The sensor is equipped with a fluid isolation flow rate The cavity blocks the gas flow generated by inhalation and exhalation, and obtains the difference in gas flow through the pressure tap. [0003] Traditional flow sensors have poor accuracy and are inconvenient to clean and disinfect. However, the current differential pressure sensors on the market have the following defects: the pressure-taking column is set in the flow tube, the air flow is greatly hindered, the gas composition is greatly dam...

AI Technical Summary

Problems solved by technology

[0003] Traditional flow sensors have poor accuracy and are inconvenient to clean and disinfect. However, the current differential pressure sensors on the market have the following defects: the pressure-taking column is set in the flow tube, the air flow is greatly hindered, the gas composition is greatly damaged, and the gas flow collection is uneven; the measured data Small precision, large error

[0004] For the above technical problems, there is currently no effective solution

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