Plunger pump adopting cylindrical diaphragm device

According to the plunger pump adopting the barrel type diaphragm device, a connecting pipe is arranged on the side face of a barrel body of the barrel type diaphragm device and connected with a pump body; a cylindrical grid with a cavity is arranged on the inner side of the cylinder body, and the diaphragm is placed in the middle of the cylinder body; the upper flange and the lower flange are respectively fixed at the upper end and the lower end of the cylinder and clamp the fixing ring of the diaphragm; an inlet of the discharging one-way valve is connected with the material hole of the upper flange; an outlet of the feeding one-way valve is connected with the material hole of the lower flange; during material suction, the plunger retreats, a medium outside the diaphragm enters the pump body through the connecting pipe under the action of air pressure, the elastic section of the diaphragm expands, and materials enter the inner side of the diaphragm through the feeding one-way valve; during discharging, the p