All-plastic emulsion pump

An all-plastic emulsion pump, comprising a body and a pressing head, wherein an upper end of the body is provided with threads, a lower end of the body is provided with a suction tube communicated with an inlet of the lower end of the body, the pressing head is connected to a main column inserted into the body, a plastic spring which can jack up the pressing head and the main column is provided in an inner cavity of the body, the plastic spring is located below the main column, the plastic spring is in a sealed connection with the main column, the plastic spring is a plastic spring tube with upper and lower ends open and side sealed, the upper end of the plastic spring is in communication with the main column, and the lower end of the plastic spring is in communication with the inlet of the body so that the plastic spring forms a channel for connecting the main column with the inlet of the body and for liquid to flow;

• at least a communication port for communicating the plastic spring and the main column up and down is provided between the two, the body is provided with a pull rod located inside the plastic spring, the pull rod corresponds up and down with the communication port and can penetrate out of the communication port when the plastic spring is pressed down, and there is a gap between the pull rod and side wall of the communication port;
• an upper end of the pull rod is provided with a stopper located above the communication port, and the stopper can press on the communication port from above when the plastic spring is pop-up to pull down the plastic spring and the main column, and seal the communication port;
• an upper opening of the body is provided with a lock cover which can limit the plastic spring in the body;
• a first one-way valve device is provided between the pressing head and the main column, which can allow emulsion in the main column to flow to the pressing head and prevent emulsion in the pressing head from flowing to the main column;
• a second one-way valve device is provided between the plastic spring and the inlet of the body, which can allow emulsion to flow into the plastic spring from the inlet of the body and prevent the emulsion in the plastic spring from flowing out of the inlet of the body;
• the body, the threads, the pressing head, the main column, the suction tube, the plastic spring, the pull rod, the stopper, the lock cover, the first one-way valve device, and the second one-way valve device are respectively made of plastic material;
• wherein a sealing seat for sealing and connecting the plastic spring and the body is provided therebetween;
• a lower end of the pull rod is fixed on the sealing seat a bottom of the sealing seat is provided with a bottom cavity;
• the sealing seat is provided with at least a through-hole communicating the plastic spring with the bottom cavity, the bottom cavity is communicated with the inlet of the body.