交变工况下深海装备机械密封端面温升和磨损特性

doi:10.16183/j.cnki.jsjtu.2021.528

摘要/Abstract

摘要：

为了研究深海复杂恶劣工况对深海涉水装备动力装置的影响,以深海推进器用接触式机械密封为研究对象,建立其二维轴对称有限元模型,探究了交变工况对密封端面温升的影响;在自行搭建的试验台上进行了机械密封拟实工况试验,监测了端面温升情况,测量并分析了端面形貌及磨损特性.结果表明:交变工况对密封环温度场有显著影响,且端面温升呈现明显的交变瞬态特性;交变工况试验后动环端面粗糙度显著增大,工况瞬变使得端面接触状态不稳定,端面发生磨粒磨损,出现明显的凹坑和深浅不一且密集分布的犁沟;交变转速较交变介质压力对端面温升及磨损的影响程度更大.数值模拟与试验结果趋势吻合良好,为深海推进器机械密封结构设计提供必要的理论指导及试验依据.

关键词: 交变工况, 机械密封, 端面温升, 磨损

Abstract:

In order to study the effects of deep-sea complex and severe working conditions on the power device of deep-sea wading equipment, taking the contacting mechanical seal for deep-sea propeller as the research object, a two-dimensional axisymmetric finite element model is established. The influence of alternating conditions on the temperature rise of seal face is explored. The pseudo-real condition test of the mechanical seal is conducted on a self-built test rig, and the temperature rise of seal face is monitored. The surface morphology and wear characteristics are measured and analyzed. The results show that the alternating conditions have a significant influence on the temperature field of the seal ring, and the temperature rise of seal face shows an obvious alternating transient characteristic. After the alternating condition test, the end face roughness of the rotating ring increases significantly. The transient working condition makes the contact state between the seal faces unstable. Abrasive wear occurs on the end face, with obvious pits and densely distributed furrows of different depths. The alternating speed has a greater influence on the temperature rise and wear of the end face than that of the alternating medium pressure. The numerical simulation results are in good agreement with the experimental results, which provides a necessary theoretical guidance and experimental basis for the structural design of the mechanical seal of the deep-sea propeller.

Key words: alternating conditions, mechanical seal, temperature rise of seal face, wear

中图分类号:

P751
TH117.2

郑思敏, 滕黎明, 赵文静, 江锦波, 王梦娇, 彭旭东. 交变工况下深海装备机械密封端面温升和磨损特性[J]. 上海交通大学学报, 2023, 57(8): 948-962.

ZHENG Simin, TENG Liming, ZHAO Wenjing, JIANG Jinbo, WANG Mengjiao, PENG Xudong. Temperature Rise and Wear Characteristics of Mechanical Seal Face of Deep-Sea Equipment Under Alternating Conditions[J]. Journal of Shanghai Jiao Tong University, 2023, 57(8): 948-962.

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参数	动环(M106K)	静环(SSiC)
密度,ρ/(kg·m^-3)	1 690	3 050
对流换热系数,κ/(W·m^-1·K^-1)	70	141
比热容,c/(J·kg^-1·K^-1)	783	670
热膨胀系数,α_T/K^-1	4.5×10^-6	4.3×10^-6
弹性模量,E/GPa	26.5	41.2
泊松比,ν	0.15	0.12
摩擦因数,f	0.1	0.1

参数	取值	参数	取值
内径,r_i/mm	40	平衡比,B	0.76
外径,r_o/mm	50	r_b/mm	42.6

参数	取值	参数	取值
κ/(W·m^-1·℃^-1)	0.625	动力黏度,μ/(mPa·s)	0.878 0
ρ/(kg·m^-3)	9 981.2	黏温系数,ρ_b/℃^-1	0.017 5

变换参数	振幅M(Γ=3.2 s)	压力变化范围/kPa
介质压力	0.1	360~440
	0.2	320~480
	0.3	280~520
	0.4	240~560
	0.5	200~600

变换参数	振幅M (Γ=0.2 s)	压力交变范围/kPa
介质压力	1.6	320~480
	3.2	320~480
	4.8	320~480
	6.4	320~480
	8.0	320~480