Traditional rocket systems must carry large amounts of fuel to generate sufficient propulsion, while electric propulsion systems use electric fields to accelerate small particles to high speeds and emit them at very high speeds from the propeller. This high discharge speed greatly reduces the amount of fuel required. This property of ion thrusters makes them ideal for correcting the position of satellites.
Although ion thrusters produce relatively low thrusts compared to conventional propulsion systems, they are capable of generating uninterrupted propulsion for several months at a time. This can be accelerated for the propelled spacecraft.
Another special feature of traditional rocket propulsion systems is that the ion thrusters work only in space or in a vacuum.
Therefore, when testing the performance of an ion thruster during development, it is necessary to create conditions similar to space. This requires a test system that produces the same pressure conditions as space. Therefore, such a system must be able to ensure that the propeller continues to simulate the environment in space while operating at maximum thrust.
This creates a large volume requirement for the vacuum system:
The test chamber must be large enough to accommodate the propeller.
The dry type vacuum pump as the backing pump of system must have a pumping speed greater than 450 m3/h in order to be able to create a pre-stage vacuum pressure of 1 x 10-2 hPa in ten minutes.
A pumping speed of approximately 2900 l / s (for nitrogen) and a high compression turbo molecular pump are required as the high vacuum pump system. It is necessary to be able to obtain a final pressure of ≤ 1 × 10 -6 hPa in less than three hours.
A PLC-based controller is required to control manual and automated testing of the system.
Vacuum solution
The vacuum solutions developed by EVP Company are tailored to meet the specific needs of this application and meet customer specifications:
A horizontal cylindrical vacuum chamber with a volume of 2 m3 was specially designed for this purpose. The vacuum chamber has a glass bead blasted interior that reduces the out gassing rate from the surface for a fast vacuuming capability. Stainless steel doors with fast switching mechanisms allow customers to easily access the vacuum chamber. The vacuum chamber is equipped with a variety of flanges, providing customers with a wide range of options for connecting additional components. The customer also requested a height adjustment of ±25 mm for the entire vacuum chamber.
A magnetically levitated turbo molecular pump was chosen as the high vacuum pump to ensure the required vacuum, pumping speed and cleanliness were achieved. Due to its high reliability and no lubrication, the Roots vacuum pump is used as a backing pump.
A PLC-based controller is installed to operate the overall system. All test steps can be monitored through data visualization, and the controller can save all data recorded during the test.
Main advantages:
1.Customized vacuum solutions
2.Based on an intelligent controller with a range of simulation modes
3.Dry vacuum pump system for maximum cleanliness
4.High pumping speed ensures the specified vacuum environment is achieved in the shortest possible time
5.Reduce operating costs by using energy efficient pumps
tags: Roots vacuum pump, turbo molecular pump
Edited by Catherine Qin / EVP Vacuum Solution
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