How to choose a vacuum pump for a vacuum sintering furnace?

When selecting a vacuum pump for a vacuum sintering furnace, it is necessary to comprehensively consider factors such as vacuum degree requirements, pumping rate, gas composition, pump combination configuration, oil pollution restrictions, cost, and maintenance. The following is a specific analysis:

1. Vacuum requirement: Select a vacuum pump based on the maximum vacuum required for the vacuum sintering furnace. Generally, it is required that the maximum vacuum of the pump be 0.5 to 1 order of magnitude higher than the maximum vacuum required by the system. For example, if the system requires a vacuum degree of 10 ⁻¹ Pa, the maximum vacuum degree of the pump should be at least 10 ⁻² Pa.
2. Extraction rate: The vacuum pump should be able to remove the amount of gas generated during the vacuum equipment process within the specified time at its working pressure. This requires consideration of the pumping rate of the vacuum pump under load conditions.
3. Gas composition: Understand the composition of the extracted gas, including whether it contains condensable vapors, particulate dust, corrosive or toxic gases, etc. Select the appropriate pump for the extracted gas. If the gas contains vapor, particles, and corrosive gases, auxiliary equipment such as condensers and dust collectors should be installed on the inlet pipeline of the pump.
4. Pump combination: Sometimes one pump cannot meet the pumping requirements, and several pumps need to be combined to complement each other in order to meet the pumping requirements. For example, a Roots pump has a high pumping speed for hydrogen but cannot pump helium, while a three pole sputtering ion pump has a certain pumping speed for argon. The combination of the two will result in a better vacuum degree in the vacuum device. Additionally, some vacuum pumps cannot operate at atmospheric pressure and require pre vacuuming; Some vacuum pumps have an outlet pressure lower than atmospheric pressure and require a front-end pump, so the pumps need to be combined for use.
5. Oil pollution restrictions: If the vacuum sintering furnace strictly requires an oil-free environment, oil-free vacuum pumps such as water ring pumps, oil-free vortex pumps, oil-free screw pumps, etc. should be selected. If the requirements are not strict, you can choose to have an oil pump and add some anti oil pollution measures, such as adding cold traps, baffles, oil blocking traps, etc., which can also meet the requirements of clean vacuum.
6. Cost and maintenance: Consider the one-time procurement cost and comprehensive usage cost of the vacuum pump, including daily operation and maintenance costs, maintenance costs, and service life costs.