Vofcit Pump Industry
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02
2023
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06
What is the difference between an internal gear pump and an external gear pump?
Author：
The difference between internal gear pump and external gear pump is: different composition, different principle, and different leakage amount.
First, the composition is different
1. Internal gear pump: The internal gear pump is composed of a pair of internal gears meshing with each other and crescent-shaped parts and pump casings in the middle.
2. External gear pump: The external gear pump is composed of external active gear, driven gear, pump body, pump cover and safety valve.
Second, the principle is different
1. Internal gear pump: The internal gear pump adopts the principle of internal meshing of gears, and the inner and outer gear pitch circles are close to one side, and the other side is separated by the "crescent plate" on the pump cover. The active internal gear on the spindle drives the outer and external gears to rotate in the same direction, and the gears are separated from each other at the inlet to form negative pressure and suck in the liquid, and the gears are continuously embedded and meshed at the outlet to squeeze the liquid out.
2. External gear pump: The external gear pump adopts the principle of seal volume change, and the shell, front and rear end cover and gear tooth valley constitute many sealing working chambers. When the gear rotates according to the diagram, an oil suction cavity is formed on the right side as the gear is disengaged, and an oil pressure cavity is formed on the left side as the gear meshes. The tooth surface contact line at the meshing point separates the gear into two cavities, high and low pressure, and plays the role of oil distribution.
Latest News
2023-06-02
Maintenance process of internal gear pump
The transmission gears of the internal gear pump generally have straight teeth, bevel teeth, herringbone teeth, helical teeth, and tooth profile keys have involute gears and arc gears. Generally speaking, small and medium-sized gear pumps mostly use involute gear spur gears, high-temperature gear pumps commonly use displacement gears, and low viscosity, polymer dissolved melt pumps commonly use involute gear bevel gears.
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Internal gear pump, do you understand?
The structure of the internal gear pump has the characteristics of simple, convenient processing, small size, light weight, strong self-absorption capacity, and insensitivity to oil pollution, and is widely used. China's gear pump industry has two major competitive advantages, on the one hand, it has the competitive advantage of low cost; At the same time, the rapid growth of domestic construction, petroleum, petrochemical and environmental protection markets and major water transfer projects have also provided important support for the development of China's gear pump industry.
2023-06-02
The structure of the internal gear pump
The internal gear pump is a gear pump with special acid resistance and wear resistance. Its characteristics are: install the active shaft and the ordinary attack shaft on the shell, install the transmission fish on a section where the active shaft is located in the shell, install the transmission fish meshing with the transmission fish teeth on the ordinary attack shaft, make a pair of transmission fish, set the inlet and outlet of raw materials on the shell, and set ceramic fiberboard on the inner cavity of the transmission fish pair under the cover content. The equipment improves the acid resistance and wear resistance of the gear pump according to the change of gear pump structure.
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The working principle and maintenance method of the internal gear pump
Internal gear pumps are widely used in petroleum, chemical, shipbuilding, electric power, grain, petroleum, food, medical, building materials, metallurgy and defense research industries. Internal gear pump is through a pair of parameters and structure of the same involute gear rolling meshing, the tank in the low pressure oil to the operable high pressure oil important components, which is the engine mechanical energy into hydraulic energy power unit, today to introduce to you the internal gear pump working principle and maintenance method.
2023-06-02
Classification, characteristics and applications of gear pumps
Gear pumps are generally divided into external meshing type (external gear pump) and internal meshing type (internal gear pump) according to the configuration mode of the meshing pair, and the internal gear pump includes a cycloid gear pump with a special tooth shape.