Numerical Simulation Study on Spindle Cooling Device for Oil-Free Scroll Vacuum Pumps

doi:10.12068/j.issn.1005-3026.2025.20230226

Abstract

Abstract:

A study is carried out on the spindle cooling structure for the existing oil‑free scroll vacuum pump in an enterprise. Based on the actual structure and working principle of the spindle cooling device for this vacuum pump， the main technical parameters affecting the cooling efficiency of the spindle are analyzed. Its internal geometric model is further constructed， and the numerical simulations of its flow field characteristics and temperature field characteristics are performed using the ANSYS Fluent software. In addition， the effect of variable cross‑section cooling pipes on the temperature drop efficiency of the device is investigated under conditions such as different pipe diameters and different numbers of outlets. The results show that when the diameter of the inlet section increases from 3.0　mm to 5.0　mm， the shaft surface temperature decreases by 12.74%； when the diameter of the outlet section increases from 2.5　mm to 3.5　mm， the shaft surface temperature decreases by 19.68%； and when the number of pipe outlets increases from 1 to 4， the shaft surface temperature decreases by 23.61%. The response of the shaft surface temperature to the change of the diameter of the middle section and the end section is not obvious. Hence， the diameter of the inlet section， the diameter of the outlet section and the number of pipe outlets are the main factors affecting the temperature drop of the eccentric spindle for the vacuum pump.

Key words: oil?free scroll vacuum pump, cooling device, flow field characteristics, temperature field characteristics, numerical simulation

CLC Number:

TB 752

Xi YUAN, Ming-xu MA, Jie CHEN, Zhe-ying WANG. Numerical Simulation Study on Spindle Cooling Device for Oil-Free Scroll Vacuum Pumps[J]. Journal of Northeastern University(Natural Science), 2025, 46(1): 92-98.

Figures/Tables 19

References 15

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参数	网格1		网格2	网格3
旋转区域单元尺寸/mm	3		2	2
管道区域单元尺寸/mm	2		2	1
节点数	289 040		650 376	655 513
单元数	1 226 643		3 278 208	3 295 124
冷空气平均流量×10⁵/（kg·s^-1）		6.776	6.552	6.545
与网格1流量对比/%	—		3.30	3.41

参数	网格1		网格2	网格3
旋转区域单元尺寸/mm	3		2	2
管道区域单元尺寸/mm	2		2	1
节点数	289 040		650 376	655 513
单元数	1 226 643		3 278 208	3 295 124
冷空气平均流量×10⁵/（kg·s^-1）		6.776	6.552	6.545
与网格1流量对比/%	—		3.30	3.41

参数	网格1	网格2	网格3
偏心主轴单元尺寸/mm	4	3	2
管道区域单元尺寸/mm	2	2	2
节点数	79 271	79 596	82 903
单元数	283 889	285 296	302 413
主轴表面平均温度/℃	58.164	58.141	57.527
与网格1温度对比/%	—	0.007	0.192

参数	网格1	网格2	网格3
偏心主轴单元尺寸/mm	4	3	2
管道区域单元尺寸/mm	2	2	2
节点数	79 271	79 596	82 903
单元数	283 889	285 296	302 413
主轴表面平均温度/℃	58.164	58.141	57.527
与网格1温度对比/%	—	0.007	0.192

参数	符号	单位	数值
主轴表面温度	—	℃	69.85
冷空气温度	—	℃	20
风扇外径	D_fan	mm	180
叶片数量	—	—	18
风扇转速	n	r/min	1 500
管道入口段长度	l_in	mm	25.5
管道入口段直径	ϕ_in	mm	4.2
管道中间段长度	l_mid	mm	118
管道中间段直径	ϕ_mid	mm	7
管道末尾段长度	l_end	mm	34.2
管道末尾段直径	ϕ_end	mm	5.0
管道出口段直径	ϕ_out	mm	3.0
管道出口数量	—	—	1.0