Roots vacuum pump mainly consists of the following key components:
Roots impellers: Roots pumps usually have two or three impellers, which are composed of specially shaped blades. They are connected together by synchronous gears and rotate inside the pump. One of the impellers is a driving impeller, which is driven by a motor or other driving device, while the other impellers act as passive impellers and move synchronously with the driving impeller.
Pump casing: The pump casing is a sealed container for accommodating the Roots impeller and other internal components. The pump casing is usually made of strong materials to withstand the pressure in a high vacuum environment.
Inlet port and outlet port: The inlet port is used to inhale gas, while the outlet port is used to discharge the extracted gas. These two interfaces are usually located at different positions of the pump casing and are connected to the vacuum system through pipes.
Side plates: Located on both sides of the Roots pump, they are used to fix and support the Roots impeller and other internal components. The side plates usually have sealing devices to ensure that gas does not leak from the inside of the pump.
Cooling device (Cooling system): Since Roots pumps generate heat during operation, cooling devices are usually required to keep the temperature of the pump within an acceptable range. The cooling device can be an external cooling water system that absorbs heat by flowing cooling water through the pump housing or side plates. It can also be an internal fan or heat sink that dissipates heat to the surrounding environment through natural convection or forced convection.
Sealing device (Sealing system): Used to prevent gas leakage. Common sealing methods include mechanical seals and lubricating oil seals. Mechanical seals usually use seals between the rotating shaft and the pump housing, which can effectively prevent gas leakage. Lubricating oil seals achieve the sealing effect by applying special lubricating oil between the pump housing and the Roots impeller.
Drive unit (Drive unit): Usually composed of a motor or other power source, used to drive the drive impeller. The drive unit is connected to the drive impeller through a synchronous gear to make it rotate. The drive unit usually has a control system that can adjust the operating speed and power of the pump.
