Water removal system of flow sensor

Abstract

The invention relates to a water removal system of a flow sensor; an air channel is communicated with a flow sensor(2) and a flow sensor probe (FQ2), the water removal system of the flow sensor comprises a first electromagnetic valve (SOV4) and a second electromagnetic valve (SOV5), and a control unit, wherein bypass air channels at one ends of the first electromagnetic valve and the second electromagnetic valve are communicated with a corresponding detection branch air channel (11) between the flow sensor and the flow sensor probe (FQ2), an air channel at the other ends of the first electromagnetic valve and the second electromagnetic valve is connected with high-pressure air; the control unit which is electrically connected with control ends of the first electromagnetic valve and the second electromagnetic valve and is used for controlling the first electromagnetic valve and the second electromagnetic valve to be closed for performing the flow detection or controlling the first electromagnetic valve and the second electromagnetic valve to be opened for performing water removal or dredging by utilizing the high-pressure air. The water removal system of the flow sensor can be used for removing the condensed water in the detection branch air channel, and the flow sensor is accurate in detection, is reliable in usage and is long in service life.

Description

Technical field [0001] The invention relates to a flow sensor, in particular to a water removal system for a flow sensor, and is especially used in medical electronics. Background technique [0002] Such as figure 1 As shown, the flow sensor probe FQ2 is connected in series on the main gas path, and is connected to the flow sensor 2 through two detection branch gas paths 11, thereby detecting the gas flow of the main path gas path and providing it to the circuit control unit or part. In medical electronic equipment, such as ventilators, it is necessary to detect the user’s breathing flow. The air inlet / outlet of the main channel of the flow sensor probe FQ2 is close to the user. Because the patient exhales hot and humid gas, it condenses when it meets the tube wall. The internal condensate of the flow sensor probe FQ2, especially the condensed water in the branch air circuit 11, causes the ventilator to detect inaccurately, and the detection accuracy is insufficient, which affect...

AI Technical Summary

Problems solved by technology

In medical electronic equipment, such as a ventilator, it is necessary to detect the user's breathing flow. The main channel inlet / outlet of the flow sensor probe FQ2 is close to the user. Since the patient exhales hot and humid gas, it condenses after meeting the tube wall, making Condensation inside the flow sensor probe FQ2, especially the detection of condensation in the airway 11, causes inaccurate detection of the ventilator and insufficient detection accuracy, thus affecting the precise control of the ventilator

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