Flow detection system of respirator

Abstract

The invention relates to a flow detection system of a respirator. The flow detection system comprises first, second, third and fourth two-position three-way electromagnetic valves (SOV2, SOV3, SOV6, SOV7), first and second electromagnetic valves (SOV4, SOV5) and a control unit, wherein an air passage at a first air inlet end of each of the two-position three-way electromagnetic valves is respectively communicated with a detection branch air passage in the two-position three-way electromagnetic valve, a second air inlet end of each of the two-position three-way electromagnetic valves is communicated with outside atmosphere, and an air outlet end of each of the two-position three-way electromagnetic valves is communicated with a detection port corresponding to a respective flow sensor; lateral air passages at the air outlet ends of the magnetic valves are communicated with a pipeline between an external detection branch interface and a second flow sensor, and the air inlet ends of the electromagnetic valves are communicated with high-pressure gas; and the control unit is used for controlling the first, the second, the third and the fourth two-position three-way electromagnetic valves to communicate with the corresponding flow sensors and the outside atmosphere for performing program zero calibration, or controlling the first and the second electromagnetic valves to open for removing water, or controlling the first, the second, the third and the fourth two-position three-way electromagnetic valves to communicate with the corresponding flow sensors and a detection air passage and closing the first and the second electromagnetic valves for flow detection.

Description

technical field [0001] The invention relates to medical equipment, in particular to a ventilator flow detection system. Background technique [0002] Traditional ventilator, air circuit structure such as figure 1 As shown, the flow detection system includes internal detection and external detection, and is composed of a first flow sensor, a second flow sensor, a first flow sensor probe FQ1 and a second flow sensor probe FQ2. Since the flow detection system is integrated with the entire ventilator air circuit, it is difficult to perform routine online calibration. Although it can also be calibrated, it will inevitably affect the normal use of the ventilator or the accuracy of flow detection. On the other hand, the external detection is close to the user. Due to the uneven temperature and heat, the internal condensation of the second flow sensor probe FQ2, especially the detection of condensation water in the branch airway, causes the second flow sensor to detect inaccuratel...

AI Technical Summary

Problems solved by technology

Since the flow detection system is integrated with the entire ventilator air circuit, it is difficult to perform routine online calibration

Although it can also be calibrated, it will inevitably affect the normal use of the ventilator or the accuracy of flow detection

On the other hand, the external detection is close to the user. Due to the uneven temperature and heat, the internal condensation of the second flow sensor probe FQ2, especially the detection of condensation water in the branch airway, causes the second flow sensor to detect inaccurately and the detection accuracy is not enough, thus affecting Precise control of the ventilator, and these technologies have not yet appeared in the ventilator or related technologies have not been disclosed

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