A negative pressure control system and control method for isolation cabins based on real-time feedback of flow rate and pressure difference

Abstract

The invention discloses a cofferdam negative pressure control system based on real-time feedback of flow rate and pressure difference, comprising a pressure difference detection module, a pressure difference PID control module, a flow detection module, a flow PD control module, and a negative pressure control module; The difference detection module detects the current pressure difference p in the isolation cabin, and sends the pressure difference p to the pressure difference PID control module; the pressure difference PID control module compares the current pressure difference p with the target pressure difference, and then outputs the pressure difference control signal PWM1 ; The flow detection module detects the current flow f of the air inlet of the isolated compartment, and sends the flow f to the flow PD control module; the flow PD control module calculates according to the current flow f, and then outputs the flow control signal PWM2; the negative pressure control The module receives PWM1 and PWM2, and outputs negative pressure control signal PWM after processing. According to the real-time feedback of flow, flow control is added to the algorithm, which avoids unnecessary power redundancy, increases battery life, and reduces fan noise.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to an isolation chamber negative pressure control system and a control method based on real-time feedback of flow and pressure difference. Background technique [0002] Patients with infectious diseases need to be isolated and treated, and in the process of transporting patients, if the conventional transport method is used, it is very easy to leak the virus, pollute the environment and infect medical staff. Therefore, it is necessary to use a negative pressure isolation chamber to isolate and transport patients, and at the same time, negative pressure is generated in the isolation chamber to ensure that the virus will not leak out. [0003] The negative pressure isolation chamber has requirements on the pressure difference and air flow inside and outside the cabin at the same time, while the existing negative pressure chambers only control the pressure difference and cann...

AI Technical Summary

Problems solved by technology

The isolation chamber only controls the pressure difference, but does not detect and control the air flow, which is very prone to the above-mentioned risk of suffocation caused by insufficient flow

Images