Neutral beam injection device multi-stage isolation high vacuum obtaining system and control method

By employing multi-level vacuum shielding technology and a step-by-step start-stop strategy, the problem of vacuum environment contamination caused by the lack of cooperation between vacuum pump units was solved, achieving efficient and stable vacuum state maintenance of the neutral beam injection device, and improving the system's operational safety and fault diagnosis efficiency.

CN121506552APending Publication Date: 2026-02-10SOUTHWESTERN INST OF PHYSICS
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Patent Information

Application Number
CN202511682107.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-17
Publication Date
2026-02-10

AI Technical Summary

Technical Problem

In existing vacuum pumping technologies, the lack of coordination between vacuum pump units leads to unstable vacuum conditions, which can easily cause vacuum environment pollution and affect the effectiveness and reliability of the neutral beam injection system.

Method used

Employing multi-stage vacuum shielding technology and a step-by-step start-stop strategy, a multi-stage vacuum isolation system composed of cryogenic pumps, Roots pumps, molecular pumps, and mechanical pumps, combined with real-time monitoring by multi-stage isolation valves and vacuum gauges, achieves a stable transition from low vacuum to high vacuum, protecting the vacuum environment from contamination.

Benefits of technology

This technology enables efficient, stable, and reliable vacuum maintenance of the neutral beam injection device, reduces vacuum environment pollution, and improves system operational safety and fault diagnosis efficiency.

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Abstract

The invention discloses a multi-stage isolation high vacuum obtaining system of a neutral beam injection device and a control method, and relates to the field of nuclear fusion Tokamak vacuum pumping design. The low-temperature pump unit comprises a plug-in low-temperature pump in a neutral beam vacuum chamber, and the plug-in low-temperature pump is used for refrigerating and cooling liquid nitrogen and liquid helium to adsorb gas to realize vacuum pumping; the low-temperature pump preceding-stage air extractor unit comprises a molecular pump unit, a roots pump unit and a mechanical pump unit; an inlet of the molecular pump set is connected with the neutral beam vacuum chamber through a gate valve, and an outlet of the molecular pump set is connected with an inlet of the roots pump set through a forestage valve. An inlet of the roots pump set is connected with the neutral beam vacuum chamber through a preceding stage valve and a pre-pumping valve, and an outlet of the roots pump set is connected with the mechanical pump set through the preceding stage valve. By adopting a multi-stage vacuum shielding technology and a step-by-step start-stop strategy, step-by-step transition from low vacuum to high vacuum and from high vacuum to low vacuum can be efficiently, stably and reliably realized, and an air extractor unit and a vacuum environment are protected from being polluted.
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