Constant-pressure pneumoperitoneum machine

According to the constant-pressure pneumoperitoneum machine, high-pressure CO2 gas from a gas source is filtered by arranging the filter, the pressure of the filtered CO2 gas is greatly reduced by arranging the pressure reducing valve, the pressure of the filtered CO2 gas is slightly and slowly reduced by arranging the proportional valve, and then the CO2 gas is output into the detection cavity, so that the purpose of variable flow and constant pressure is achieved; control is simple, and the control effect is good. Moreover, the pressure of the CO2 gas in the detection cavity can be subjected to micro-flow control in real time through the proportional valve, so that the pressure of the CO2 gas in the detection cavity can be maintained at a required set value. 本申请提供一种恒压气腹机，通过设置过滤器对来自气源的高压CO2气体进行过滤，通过设置减压阀先对过滤后的CO2气体进行大幅度降压，通过设置比例阀再将过滤后的CO2气体的压力小幅度缓缓降低，然后输出至检测腔内，达到变流恒压的目的，控制简单，控制效果好。而且，还可以通过比例阀实时对检测腔内CO2气体的压力进行微流控制，可以使得检测腔内CO2气体的压力维持在所需要的设定值。