Proportional Control Quick Response Device for Low Pressure and Large Flow and Its Quick Response Control Valve

Abstract

The invention relates to a low-pressure large-flux ratio control quick response device and a quick response control valve thereof. The quick response control valve comprises a valve seat, a voice coil motor, a seal head and an elastic part, wherein the valve seat is provided with a valve cavity, an air inlet and an air outlet, the air inlet and the air outlet are communicated with the valve cavity, the voice coil motor comprises a control shaft capable of moving in the axial direction, and the control shaft stretches out towards an inner port of the air inlet; the seal head is arranged at the stretch-out end, stretching towards the inner port of the air inlet, of the control shaft, can move back and forth along with the control shaft and is used for sealing the inner port of the air inlet; the elastic part provides the elastic force allowing the control shaft to move outwards so as to enable the seal head to seal the inner port of the air inlet. The voice coil motor is a simple electromagnetic device free of direction change and is high in reliability and energy conversion efficiency, and through the change and conversion of current, quick change of the state of the control valve and flow control quick response and accurate control within a specific large-flux range under low pressure can be achieved.

Description

technical field [0001] The invention relates to the field of medical equipment, more specifically, to a low-pressure, high-flow proportional control quick-response device and a quick-response control valve used in anesthesia machines and ventilator products. Background technique [0002] In anesthesia machines, ventilators and related products, the usual gas source is the input of high-pressure gas cylinders or the central pipeline gas supply system. The pressure of these two gas sources supplied to the anesthesia machine and ventilator is 280kPa-600kPa. In a system that uses any of these two air sources as an input, it is very common to control the flow by selecting a solenoid proportional valve. The working pressure of this electromagnetic proportional valve is generally 200-600kPa, and the working pressure is relatively high. According to the size of the output flow, it can be divided into electromagnetic proportional valves with small flow (less than 20L / min) and large f...

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Problems solved by technology

[0005] 1) The response speed is slow, which cannot meet the requirements of the high-performance ventilator for the flow control response speed; the main reason is that the turbine fan is in a state of high-speed rotation. The greater the speed, the greater the change in speed. The physical characteristics of the fan determine that it cannot meet this requirement. The fan can only achieve its speed change through a slow change (gradual change), because the rotor has inertia during operation. From a state It takes time to change to another state, which cannot meet the requirement of response time of tens of milliseconds

The ventilation mode that requires a higher response time cannot achieve the expected effect with this control method, and the output performance is poor

[0006] 2) When the turbo blower starts and stops frequently or switches between high and low speeds, the service life of the turbo blower will be greatly reduced, and large noise will be generated, and the performance of the machine will be relatively poor

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