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The investigation of flow characteristics in Roots vacuum pump with internal return cavity
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Jianting LIU1, 2, Yang LI1, 2, Xiaopei LI1, 2, Haiqiang LI1, 2
Fluid Machinery | 2025, 53(1) : 25 - 32
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Fluid Machinery | 2025, 53(1): 25-32
The investigation of flow characteristics in Roots vacuum pump with internal return cavity
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Jianting LIU1, 2, Yang LI1, 2, Xiaopei LI1, 2, Haiqiang LI1, 2
Affiliations
  • 1Jiangsu XCMG Construction Machinery Research Institute Co., Ltd., Xuzhou 221001, China
  • 2State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou 221001, China
Published: 2025-01-30 doi: 10.3969/j.issn.1005-0329.2025.01.004
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In order to solve gas dynamic noise of Roots vacuum pump due to gas pulsation, return cavity models of four different structures, such as constant rectangular, expanding rectangular, constant depth arc and expanding arc cavities, were designed. The effects of return cavity structure on exhaust pressure, flow rate and internal flow field were analyzed by using the RNG k- εturbulence model and dynamic mesh method, and were verified by experiment. The research results show that the return cavity can increase the pressure of primitives volume in the pump chamber, which effectively suppresses high-pressure gas backflow and improve pressure and flow fluctuation at the outlet. Meanwhile, it can cause lower volumetric flow at inlet. When the inlet pressure is 30~76 kPa, compared with other three return cavities, the fluctuation amplitude of exhaust pressure and flow rate are the lowest at the outlet of constant depth rectangular return cavity (1.31~6.97 kPa and 0.39~1.48 m3/s, respectively). The research results can provide a theoretical basis for noise reduction and structural optimization of the Roots vacuum pump.

Roots vacuum pump  /  return cavity  /  pressure  /  flow rate  /  fluctuation amplitude
刘建停, 李杨, 李晓配, 李海强. 内设回流槽的罗茨真空泵流动特性研究. 流体机械, 2025 , 53 (1) : 25 -32 . DOI: 10.3969/j.issn.1005-0329.2025.01.004
Jianting LIU, Yang LI, Xiaopei LI, Haiqiang LI. The investigation of flow characteristics in Roots vacuum pump with internal return cavity[J]. Fluid Machinery, 2025 , 53 (1) : 25 -32 . DOI: 10.3969/j.issn.1005-0329.2025.01.004
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Year 2025 volume 53 Issue 1
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Article Info
doi: 10.3969/j.issn.1005-0329.2025.01.004
  • Receive Date：2024-01-10
  • Online Date：2026-10-15
  • Published：2025-01-30
Article Data
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History
  • Received：2024-01-10
  • Revised：2024-05-07
Affiliations
    1Jiangsu XCMG Construction Machinery Research Institute Co., Ltd., Xuzhou 221001, China
    2State Key Laboratory of Intelligent Manufacturing of Advanced Construction Machinery, Xuzhou 221001, China
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光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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