A High Precision Differential Pressure Control Valve

Abstract

The invention discloses a high-precision pressure difference control valve which comprises an adjusting diaphragm positioned in the center of a valve body and used for dividing the middle of the valve body into a left air chamber and a right air chamber, wherein the two air chambers are communicated with upstream and downstream pressure inlets respectively; the left air chamber is communicated with a left air outlet connected to an air source; a left steel ball capable of controlling the pressure to adjust the size of the cross section is arranged at an air hole of the left air chamber communicated with the left air outlet; the right air chamber is communicated with a right air outlet; a right steel ball capable of controlling the pressure to adjust the size of the cross section is arranged at an air hole of the right air chamber communicated with the right air outlet; and a left steel ball bracket is fixedly connected with a right steel ball bracket. The sizes of the cross sections are adjusted by adjusting the pressures of the air holes of the left and right air chambers communicated with the left and right air outlets, so that the pressure difference between the upstream and downstream pressure inlets communicated with the left and right air chambers is controlled, thereby enabling the pressure difference between the upstream and downstream pressure inlets to be fixed or adjustable.

Description

technical field [0001] The invention relates to the technical field of medical devices, in particular to a high-precision differential pressure control valve, which is used in the flow adjustment assembly structure of a low-pressure air source ventilator. Background technique [0002] During the use of medical devices such as ventilators, patients must be mechanically ventilated. Different types of patients require different modes of ventilation. All ventilation modes are realized through the airflow control actuator and actuator control algorithm of the device. [0003] Air sources for ventilators generally include high-pressure air sources (above 80kPa) and low-pressure air sources (below 20kPa). Ventilators using high-pressure air sources generally use proportional valves or on-off solenoid valves combined with manual flow regulating valves to control the ventilation flow rate and sum of traffic. Low-pressure air source ventilators mostly use proportional valves, and som...

AI Technical Summary

Problems solved by technology

When controlling the flow rate of high-pressure gas source, the influence of pressure difference on flow rate is small, and this factor is generally ignored in control, but the pressure difference will have a greater impact on the control of low-pressure gas source flow rate, which cannot be ignored

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