There are significant differences between vacuum diffusion pump oil and ordinary oil pump in terms of definition, working principle, structure, application field, and maintenance. Here is a detailed comparison between the two:


1、 Definition and Working Principle
Oil diffusion pump


Definition: An oil diffusion pump is a vacuum pump that utilizes low-pressure, high-speed, and directional flow of oil vapor jets for pumping.
Working principle: When the oil diffusion pump is working, the oil inside the pump is heated to boiling, producing a large amount of oil vapor. These vapors are ejected at high speed through nozzles, forming steam jets. The gas molecules in thermal motion diffuse into the vapor flow, collide with the oil vapor molecules in directional motion, thereby gaining momentum and generating directional flow in the same direction as the oil vapor molecules. After reaching the front stage, the oil vapor is condensed, releasing gas molecules, which are then pumped away by the front stage pump to achieve the purpose of pumping.
Ordinary oil pump


Definition: An oil pump is a type of pump used for transporting liquids, widely used in fields such as petroleum, chemical, and food.
Working principle: The oil pump sucks liquid into the pump body through the rotation of the impeller, and then discharges the liquid out of the pump body through pressure. This process relies on the conversion of the mechanical energy of the impeller into the kinetic energy and static pressure energy of the liquid.
2、 Structural differences
Oil diffusion pump


It mainly consists of pump body, diffusion nozzle, steam duct, oil pot, heater, diffuser, cooling system, and spray nozzle. These components work together to achieve the generation, directional flow, and condensation process of oil vapor.
Ordinary oil pump


The structure is relatively complex, including multiple components such as impellers, bearings, seals, etc. These components ensure that the oil pump can deliver liquids stably and efficiently.
3、 Application Fields
Oil diffusion pump


Mainly used to obtain high vacuum or ultra-high vacuum environments, it is widely used in vacuum smelting, vacuum coating, space simulation experiments, and some vacuum systems that are insensitive to oil pollution.
Ordinary oil pump


Widely used in industries such as petroleum, chemical, and food to transport various liquid media.
4、 Maintenance and upkeep
Oil diffusion pump


Due to its relatively simple structure and operation in high vacuum environments, maintenance and upkeep are relatively simple. But it is necessary to pay attention to regularly replacing the pump oil, cleaning the pump chamber, and checking the sealing performance.
Ordinary oil pump


Due to its complex structure and operation in general industrial environments, it requires more maintenance work. For example, replacing lubricating oil, cleaning filters, checking bearings and seals, etc.