PLUNGER PUMP, OVERPRESSURE PROTECTION METHOD, SPRAYING CONTROL METHOD, AND PLANT PROTECTION UNMANNED AERIAL VEHICLE

摘要

Provided in the present application are a plunger pump, an overpressure protection method, a spraying control method, a plant protection unmanned aerial vehicle, and a spraying device. The plunger pump comprises: a pump body structure, which is provided with a liquid intake cavity and a liquid outlet cavity; a plunger structure, at least a part of which is accommodated within the pump body structure and which can reciprocate within the pump body structure, so that the plunger pump sucks a liquid into the liquid intake cavity and extrudes the liquid out of the liquid outlet cavity; and an overpressure protection structure, which is mechanically coupled to the pump body structure, the overpressure protection structure is provided with a backflow passage, and the backflow passage can change between an open state and a closed state. When the backflow passage is in the open state, the liquid can return from the liquid outlet cavity to the liquid intake cavity. When pressure within the liquid outlet cavity is too high, the backflow passage may be switched to the open state, so that liquid within the pump body structure can return from the liquid outlet cavity to the liquid intake cavity, thereby releasing the pressure within the liquid outlet cavity.