All-plastic combined press pump

An all-plastic combined press pump, comprising:

• a lock bottle cap capable of being fixed on a liquid containing bottle;
• a pump body and a locking cap capable of fixing the pump body on the lock bottle cap are disposed on the lock bottle cap;
• a liquid storage chamber, a communication port communicated with the liquid storage chamber, a one-way valve capable of controlling the communication port to be opened to enable a liquid to enter the liquid storage chamber, and a pumping assembly capable of sliding up and down are disposed in the pump body;
• a press head is disposed at an upper end of the pumping assembly, which is configured for driving the pumping assembly to move downwards to enable air pressure to be generated in the liquid storage chamber to extrude the liquid in the liquid storage chamber to flow out;
• and
• a plastic spring is disposed between the locking cap and the press head, which is configured for elastically pressing the press head to drive the pumping assembly to reset upwards to enable negative pressure in the liquid storage chamber to be generated so as to open the one-way valve to suck the liquid into the liquid storage chamber, wherein the plastic spring comprises a first supporting part abutting against the locking cap, a second supporting part arranged above the first supporting part and abutting against the press head, and a plurality of elastic connecting parts arranged between the first supporting part and the second supporting part and sequentially connected end to end to form a continuous Z-shaped structure,
• wherein the pumping assembly comprises a pump rod with an upper end extending through the locking cap to be inserted into the press head and a lower end extending into the liquid storage chamber, and a piston mounted on the pump rod and capable of moving relative to the pump rod and then driven by the pump rod;
• and
• wherein a lower end of the locking cap is provided with an extension part extending into the pump body for abutting against and positioning the piston as the piston moves upwards;
• an inserted tube extending downwards to be inserted into the extension part is disposed on the press head;
• and the extension part and the inserted tube surround to form a spring cavity containing the plastic spring.