Diaphragm compressor and control method

According to the diaphragm compressor and the control method, one end of a cylinder cover and one end of a cylinder body are connected to the connecting end of the cylinder cover and the cylinder body to form a working cavity, a diaphragm is arranged in the working cavity, a driving piston is arranged in the working cavity on one side of the cylinder body, and an air inlet pipeline and an exhaust pipeline which are communicated are arranged in the working cavity on one side of the cylinder cover; the liquid supplementing device is communicated with the gas inlet pipeline, it is guaranteed that the process of sucking in or discharging gas with buffer liquid under high-frequency work is stable and reliable, the liquid supplementing device is adopted to cover a layer of buffer liquid on a diaphragm, the effects of buffering movement of the diaphragm and reducing the clearance volume are achieved, and the diaphragm firstly impacts on the buffer liquid, so that the gas with the buffer liquid is sucked out. The str