Throttle piece, differential pressure pulmonary function parameter monitoring device and method for determining flow rate

Abstract

The disclosure provides a throttling piece, a differential pressure pulmonary function parameter monitoring device and a flow determination method. The porous throttling member includes a tube and a throttling orifice, wherein the tube is used to form an air flow channel; the throttling orifice is arranged in the tube and includes: a plurality of first components, the plurality of first components and the tube coaxial arrangement; and a plurality of second components, distributed radially in the tube; thus, a plurality of tubular orifices are formed in the air flow passage by the plurality of first components and the plurality of second components . The throttling piece, differential pressure pulmonary function parameter monitoring device and flow determination method provided by the present disclosure have simple structure, low cost, lower requirements on the length of the straight pipe section, wider measurement range, and effectively improve the high-speed flow in the exhalation / inhalation process. The vortex that appears under the condition of flow rate realizes the balance of air flow and improves the repeatability and reliability.

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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