Throttling element, differential pressure type pulmonary function parameter monitoring device and flow rate confirming method

Abstract

The invention provides a throttling element, a differential pressure type pulmonary function parameter monitoring device and a flow rate confirming method. The porous throttling element comprises a pipe and a throttling porous plate, wherein an airflow channel is formed via the pipe; the throttling porous plate is arranged in the pipe, and the throttling porous plate comprises a plurality of firstcomponents and a plurality of second components; the plurality of first components are distributed in a mode of being coaxial with the pipe; the plurality of second components are distributed in thepipe in a radial form; therefor, a plurality of tubular throttling holes are formed in the airflow channel via the plurality of first components and the plurality of second components. The throttlingelement, the differential pressure type pulmonary function parameter monitoring device and the flow rate confirming method provided by the invention are simple in structure and low in cost; a requirement on the length of a straight-pipe section is reduced and a measuring range is widened; vortex, which appears under a high-flow-rate condition in an expiration / inspiration process, is effectively improved; airflow balance is realized; and repeatability and reliability are improved.

Description

technical field [0001] The present disclosure relates to the technical field of portable medical equipment, in particular, to a throttling member, a differential pressure pulmonary function parameter monitoring device and a flow determination method. Background technique [0002] Currently, there are three commonly used sensor types for measuring pulmonary function parameters: differential pressure, hot wire, and turbine. Among them, the differential pressure type calculates the flow rate according to the differential pressure generated by the airflow passing through the throttling part, which has the advantages of simple structure, low cost, and good repeatability, but there are also zero drift, large pressure loss, narrow range, and great influence by eddy currents. Disadvantages; the hot-wire scheme is based on the principle of heat transfer, and the current of the sensor is proportional to the flow rate. It has high sensitivity and good accuracy, but it is easily affecte...

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Problems solved by technology

Among them, the differential pressure type calculates the flow rate according to the differential pressure generated by the airflow passing through the throttling part, which has the advantages of simple structure, low cost, and good repeatability, but there are also zero drift, large pressure loss, narrow range, and great influence by eddy currents. Disadvantages; the hot-wire scheme is based on the principle of heat transfer, and the current of the sensor is proportional to the flow rate. It has high sensitivity and good accuracy, but it is easily affected by the environment, expensive and easy to damage; the turbine scheme is based on the turbine The rotation speed is proportional to the flow rate, and the measurement range is wide, but it is easily affected by the moment of inertia

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