What are the main aspects that determine the self-priming ability of gear pumps

The working principles of different gear pumps and the structural processes of different gear pumps are different. Due to the different internal structural processes of different gear pumps, the working principles of gear pumps are also different. Generally, it is mainly divided into ordinary external gear pumps and internal gear pumps. Among them, ordinary external gear pumps include involute helical gears, spur gear types, and circular arc gear types. Internal gear pumps mainly include eccentric cycloidal gear pumps and internal rotor gear pumps (commonly known as internal gear pumps or internal gear pumps). &A pump composed of two gears meshing together is called a gear pump. It relies on the volume change of the meshing space of the gear teeth to transport liquids, and it belongs to the rotary pump or can be considered as a positive displacement pump. There are many types of gear pumps. According to the meshing method, it can be divided into external gear pumps and internal gear pumps; According to the tooth profile, it can be divided into spur gear pumps, helical gear pumps, and herringbone gear pumps. External gear pump is a commonly used gear oil pump. Generally, gear pump refers to external gear pump. It mainly consists of a driving gear, a driven gear, a pump body, a pump cover, and valves. The sealed space formed by the pump body, pump cover, and gear is the working chamber of the gear pump. The axles of the two gears are respectively installed in the bearing holes on the two pump covers, and the driving gear shaft extends out of the pump body and is driven to rotate by the electric motor. The external gear pump has a simple structure, light weight, low cost, and a wide range of work and applications. When the gear pump is working, the driving wheel rotates together with the electric motor and drives the driven wheel to rotate accordingly. When the meshing teeth on one side of the suction chamber gradually separate, the volume of the suction chamber increases, the pressure decreases, and the liquid in the suction tube is sucked into the pump; The inhaled liquid is divided into two paths and pushed into the discharge chamber by the gear in the tooth groove. After the liquid enters the discharge chamber, due to the continuous meshing of the teeth of the two gears, the liquid is squeezed and enters the discharge pipe from the discharge chamber. The driving gear and the driven gear continuously rotate, allowing the pump to continuously suck in and discharge liquid.