Gas flowmeter and medical device with same

Abstract

The invention discloses a gas flowmeter and a medical device with the same. The gas flowmeter comprises a cavity internally provided with a gas flow chamber, a magnetic throttling member which is arranged in the gas flow chamber and provided with an orifice with a variable cross sectional area, a magnetic member arranged close to the magnetic throttling member on the cavity, and a differential pressure flow sensor used for detecting the pressure difference on both sides of the magnetic throttling member in the gas flow chamber and calculating the flow of the gas passing through the gas flow chamber according to the pressure difference, wherein the cross sectional area of the orifice is unchanged under the action of the magnetic member when the flow of the gas passing through the magnetic throttling member is smaller than or equal to a preset value, and the cross sectional area of the orifice is increased under the action of the gas passing through the magnetic member when the flow of the gas passing through the magnetic throttling member is larger than the preset value. The gas flowmeter has the advantages of being high in measurement accuracy, stable in measurement at small gas flow and capable of providing safe and stable small gas flow and the like.

Description

technical field [0001] The present invention relates to the medical field, in particular to a gas flow meter and medical equipment with the gas flow meter Background technique [0002] In the existing ventilator and anesthesia machine, in order to measure the flow of the ventilation air flow, a gas flow meter is often used. Gas flowmeters include equal-diameter flowmeters and variable-diameter flowmeters. The variable diameter flowmeter is composed of a throttling device, a sampling pipeline and a differential pressure flow sensor. The throttling device is often installed in the pipeline through which the gas flows, so that the pipeline will form a local contraction effect, and the pressure of the airflow will decrease after flowing through the constricted pipeline, thereby generating a pressure difference between the upstream and downstream of the throttling device . The differential pressure flow sensor communicates with the upstream and downstream of the throttling dev...

AI Technical Summary

Problems solved by technology

[0003] However, the existing variable-diameter gas flowmeter is generally not in a steady state due to the air flow flowing through the flowmeter, which will cause the variable-diameter diaphragm to vibrate, and at low flow rates, especially at flow rates below 1L / min, the vibration of the diaphragm will It has a great influence on the flow measurement, which makes the ultra-small flow measurement inaccurate, which brings discomfort or risk to infants and young children when using ventilators and anesthesia machines

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