All-plastic Pump

An all-plastic pump,

• comprising an outer cover, a plastic spring, an inner cover and a pressing head, wherein
• an accessory cavity is defined by the outer cover, and a conveying hole is formed inside the accessory cavity;
• the plastic spring is disposed in the accessory cavity, the plastic spring is in a tubular shape, the plastic spring surrounds the conveying hole, a plurality of supporting rods are circumferentially disposed on an inner wall of a port, away from the conveying hole, of the plastic spring, and one ends, close to the conveying hole, of the plurality of supporting rods are connected to a baffle;
• the inner cover is disposed in the accessory cavity, the inner cover surrounds the plastic spring, a stop tube is disposed inside the inner cover, the stop tube penetrates into a space defined by the plurality of supporting rods, and a port of the stop tube is in sealing abutting connection with the baffle;
• and
• the pressing head is installed in the accessory cavity in a pressable manner, a discharging hole is formed outside the pressing head, a pressing sheet and a conveying tube are disposed inside the pressing head, the pressing sheet surrounds the conveying tube, the pressing sheet is opposite to an end face of the plastic spring, the conveying tube is inserted into the stop tube, the conveying tube is in communication with the discharging hole, and pressing of the pressing head is configured to push the pressing sheet to urge the plastic spring so as to separate the baffle and the stop tube from each other.