The history of vacuum pump

Rotary vane vacuum pump refers to a device or equipment that uses mechanical, physical, chemical or physical-chemical methods to evacuate the pumped container to obtain a vacuum. In layman's terms, a vacuum pump is a device that uses various methods to improve, generate, and maintain a vacuum in a closed space.

This article contains the following:

n  The history of vacuum pump

n  Lubricating oil for vacuum pump

n  What to do if the vacuum pump emits smoke and fuel

The history of vacuum pump

With the development of vacuum applications, many types of vacuum pumps have been developed, and their pumping speeds range from a few tenths of a second to hundreds of thousands or millions of liters per second. With the increasing requirements of vacuum technology in the field of production and scientific research on its application pressure, most of them need to be composed of several vacuum pumps to form a vacuum pumping system to meet the requirements of production and scientific research processes. The range of working pressure involved in the application department is very wide, so any type of vacuum pump cannot be fully applicable to all working pressure ranges. Only different types of vacuum pumps can be used according to different working pressure ranges and different working requirements. For the convenience of use and the needs of various vacuum processes, sometimes various vacuum pumps are combined according to their performance requirements and applied in the form of a unit.

Commonly used vacuum pumps include dry screw vacuum pumps, water ring pumps, reciprocating pumps, slide valve pumps, rotary vane pumps, roots pumps, and diffusion pumps. These pumps are indispensable main pumps in the vacuum process of various industries in China Species. In recent years, with the sustained and rapid development of my country's economy, the vacuum pump related downstream application industry has maintained a rapid growth momentum. At the same time, driven by the continuous expansion of vacuum pump application fields and other factors, my country's vacuum pump industry has achieved sustained, stable and rapid development.

Lubricating oil for vacuum pump

In the vacuum pump, the vacuum pump oil not only serves as a medium for obtaining a vacuum, but also plays a role in lubrication, cooling and sealing of mechanical friction points.

This is the most important performance of vacuum pump oil. Since the vacuum pump requires a high degree of vacuum, paraffin-based narrow-distillate lubricating oil is generally used. For diffusion vacuum pumps, silicone oil or other synthetic oils with low vapor pressure can also be used.

The internal volume of the vacuum pump chamber is constantly changing to form an exhaust function, which requires that the lubricating oil should have appropriate viscosity and viscosity-temperature characteristics.

Vacuum pumps continue to develop at high speeds. Due to the high-speed friction between the sliding vane and the pump body, the oil temperature increases, and the oil products are easily oxidized and decomposed. Especially the diffusion pumps often work in a high temperature environment, which increases the vapor pressure in the system. The degree of vacuum is reduced, so the vacuum pump oil is required to have good thermal oxidation stability.

If the vacuum pump sucks corrosive gas, it will chemically react with the oil and corrode the parts inside the pump; the suction air often contains water vapor condensate, which causes the emulsification of the vacuum pump oil and corrosion of the metal, so it is required to have good anti-corrosion and anti-emulsification.

The main requirement is that the vacuum pump does not carry light components, so as not to affect the saturated vapor pressure of the oil.

The ultimate pressure is an important performance index of vacuum pump oil to understand the ultimate pressure of the vacuum pump at the lowest vacuum ultimate pressure.

What to do if the vacuum pump emits smoke and fuel

1. Smoke, if the pump is just starting to run, there is a phenomenon of smoke, it is normal, if it is smoking for a long time, it is abnormal. Solution: Smoke indicates that the pump's air inlet, including pipelines, valves, and containers have been repaired. After the leak detection is processed, the smoking will end. Vortex flowmeter

2. Fuel injection, indicating that there are a lot of leaks outside the air inlet, and even the air inlet is exposed to the atmosphere. The solution: seal the air inlet of the pump to run the pump. If there is no fuel injection, there is a leak. The exhaust valve is damaged. Check whether the exhaust valve is damaged.

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