Breathing machine, anaesthesia machine and flow proportional valve

Abstract

The invention provides a breathing machine, an anaesthesia machine and a flow proportional valve. The flow proportional valve comprises a shell body, wherein an inlet and an outlet are formed in the shell body. The flow proportional valve further comprises a magnet yoke, a central shaft sleeve, a sliding shaft, and a magnet which are installed inside the shell body. The magnet yoke comprises a guide portion. The guide portion comprises a fluid channel, wherein a first end of the fluid channel is communicated with the inlet. The central shaft sleeve comprises an axial hole, the central shaft sleeve is fixedly sleeved on the guide portion through the axial hole, a first opening which is communicated with the axial hole is formed in the peripheral wall of the central shaft sleeve, and the first opening is communicated with the outlet. A coil is arranged on the sliding sleeve, the sliding sleeve can be sleeved on the central shaft sleeve in a sliding mode, and the sliding sleeve is provided with a communicating position which enables the first opening and the outlet to be communicated. By applying certain pulsed voltage on the coil, control of the opening degree of the first opening in the central shaft sleeve by the sliding sleeve is realized, and the purpose of high flow proportional control under the low-pressure state is achieved. In addition, the flow proportional valve has the advantages of being simple in structure, fast in responding speed, high in repeated accuracy, and long in service life.

Description

Technical field [0001] The present invention relates to the field of proportional valves, and more specifically, to a ventilator, anesthesia machine and a flow proportional valve. Background technique [0002] The flow proportional valve in the prior art usually uses a voice coil motor to control a certain actuator (such as a cone, a membrane or a baffle) to compress an elastic element to make a linear displacement. This displacement changes the throttle area of ​​the fluid passage, thereby Control the flow of gas. [0003] However, the opening area (that is, the diameter) of the flow proportional valve in the prior art is relatively small. Therefore, in order to achieve a larger flow requirement, a higher input gas pressure is usually used. However, in some airway systems of ventilator or anesthesia machine driven by microturbine, the gas pressure is not high (for example, the pressure generated by the microturbine during normal operation is generally only a few thousand Pascals)...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to provide a ventilator, an anesthesia machine and a flow proportional valve, so as to solve the problem that the flow proportional valve in the prior art cannot realize the large flow control requirement

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