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| 1 | Leakage Prediction Method for Contacting Mechanical Seals with Parallel Faces显示文摘Since the beginning of the 20th century, many researches on the sealing characteristic of mechanical seals were carried out broadly and in depth by various methods and some leakage models were built. But due to the lack of the way to characterize the main factors of influence on the leakage, most of the early researches were based on the assumptions that the seal faces topography and the frictional conditions were invariant. In the early built models, the effect of the surface topography change of the seal face on the leakage rate was neglected. Based on the fractal theory, the contact of end faces of the rotary and stationary rings was simplified to be the contact of a rough surface and an ideal rigid smooth surface, and the contact interface’s cavity size-distribution function as well as the fractal characteristic of the cavity profile curve was discussed. By analyzing the influence of abrasion on the seal face topography and the leakage channel, the time-correlation leakage prediction model of mechanical seals based on the fractal theory was established and the method for predicting the leakage rate of mechanical seals with parallel plane was proposed. The values of the leakage rate predicted theoretically are similar to the measured values of the leakage rate in the model test and in situ test. The experimental results indicate that the leakage rate of mechanical seals is a transient value. The surface topography of the end faces of the seal rings and its change during the frictional wear of mechanical seals can be accurately characterized by the fractal parameters. Under the work conditions of changeless frictional mechanism, the fractal parameters measured or calculated based on the accelerated testing equation can be used to predict the leakage rate of mechanical seal in service. The proposed research provides the basis for determining the leakage state and predicting working life of mechanical seal. | SUN Jianjun WEI Long FENG Xiu GU Boqin | 2010 | Chinese Journal of Mechanical Engineering2010，23，1： | 16 |
| 2 | CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL显示文摘为了调查封上的表演变化,源于结束脸的热变丑,计算液体电影的方程迫使分发,适用的力量和漏率被导出,为在平行差距并且在楔形的差距的液体电影。封上的成员的几何参数借助于热转移分析和复杂方法被优化。当旋转戒指旋转,在螺线沟结束脸的液体电影的适用的力量在扁平的结束脸比那大得多时,分析结果显示浅螺线沟能产生水动力学压力。变丑在扁平的结束脸增加液体电影的适用的力量,但是它减少在螺线沟结束的液体电影的水动力学压力面对。决定液体电影的特征的差距尺寸被在适用的力量和关门力量的平衡条件的考虑联合摩擦的热和热变丑的分析获得。为不同差距尺寸,在关门力量和漏率之间的关系也被调查,基于哪个漏率能被调整关门力量控制。 | ZHOU Jianfeng GU Boqin | 2007 | Chinese Journal of Mechanical Engineering2007，20，6： | 8 |
| 3 | INVESTIGATION INTO EFFECT OF SPRING PRESSURE ON PERFORMANCE OF BALANCED MECHANICAL SEALS显示文摘The loads acting on the sealing elements of balanced mechanical seals are analyzed. When the balance factor approaches the back pressure factor, the spring pressure will become main part of the face pressure. The leakage model of balanced mechanical seals is established on the base of M-B model for rough surface. Several GY-70 type balanced mechanical seals are tested. The influences of the spring pressure both on the leakage rate and on the friction characteristic of balanced mechanical seals are investigated. The research results indicate that as spring pressure increases, both the clear-ance between two end faces and the leakage rate will decrease, and the friction will be more serious because lubrication medium between the rotating ring and the stationary ring reduces, though the increase of the spring pressure may not be enough to change the face friction state of mechanical seals. There exists an optimum spring pressure for mechanical seal operation. Under this spring pres-sure, not only leakage rate is small, but also the seal end surfaces have a fine friction characteristic. Under different operating conditions, identical type mechanical seals may possess different spring pressure. Appropriate selection of spring pressure is valuable to realize long-period and small leakage rate operating of balanced mechanical seals. | SUN Jianjun GU Boqin | 2007 | Chinese Journal of Mechanical Engineering2007，20，3： | 7 |
| 4 | Boundary velocity slip of pressure driven liquid flow in a micron pipe显示文摘The velocity slip of gas flow in a micron channel has been widely recognized.For pressure driven liquid flow in a macro pipe,theminute velocity slip at the wall boundary is usually neglected.With a decreasing scale in the cross section of the flow passage,the effect of velocity slip on flow and heat transfer behaviors becomes progressively more noticeable.Based on the three Hamaker homogeneous material hypotheses,the method for calculating the acting force between the solid and liquid molecular groups is established.By analyzing the forces exerted on the liquid group near the pipe wall,it is found that the active force arising from the rough solid wall can provide the component force to resist the shearing force and keep the liquid group immobile.Based on this a velocity slip criterion is proposed.Considering the force balance of a slipping liquid group,the frictional force caused by the solid wall can be obtained and then the velocity of the liquid group can be calculated using the derived coefficient of friction.The investigation reveals that,in a micron pipe,a small velocity slip may occur when the flow pressure gradient is relatively large,and will cause errors in the pipe flow estimates. | ZHOU JianFeng GU BoQin SHAO ChunLei | 2011 | Chinese Science Bulletin2011，56，15： | 7 |
| 5 | Frictional heat transfer regularity of the fluid film in mechanical seals显示文摘The frictional heat transfer regularity in the mechanical seal system consisting of the rotating ring, the stationary ring, the fluid film in the end faces and the sealed medium was investigated. The primary factors affecting the frictional heat transfer regularity, such as the heat transfer coefficients from the rings to the sealed medium, the frictional heat flux, the frictional heat distribution ratio and so on, were discussed. The equations for calculating the temperature field both in the sealing members and in the fluid film were derived. The coupling analysis of the frictional heat of the fluid film and the thermal deformation of the two end faces of the rings was carried out to obtain the separation angle of the two deformed end faces in consideration of the viscosity change of the fluid film. The results indicate that the frictional heat of the fluid film heavily affects its characteristic and the sealing performance of mechanical seals. The frictional heat changes not only the shape of the gap between the end faces but also the viscosity of the fluid film, and thereupon leads to the increase of the leakage rate. The maximum temperature of the system is at the inner radius of the fluid film, and most of the frictional heat is conducted by the rotating ring. Based on the heat transfer analysis method put forward in this paper, the parameterized design of mechanical seals can be realized to determine the best geometrical parameters and to select the appropriate material of the sealing members. | GU BoQin ZHOU JianFeng CHEN Ye SUN JianJun | 2008 | Science China(Technological Sciences)2008，51，5： | 2 |
| 6 | Prediction of Leakage Rates Through Sealing Connections with Nonmetallic Gaskets * * Supported by the Funds for Outstanding Scientists of Jiangsu Province of China (No.2005-6).显示文摘 | Boqin GU Ye CHEN Dasheng ZHU | 2007 | Chinese Journal of Chemical Engineering2007，，6： | 1 |
| 7 | Investigation of leak detection method by means of measuring the pressure increment in vacuum显示文摘 | Gu Boqin Huang Xinglu | 2006 | Vacuum2006，809，： | 1 |
| 8 | An improved design of spi-ral groove mechanical seal显示文摘 | Zhou Jiangfeng Gu Boqin Chen Ye | 2008 | Chin J Ch E2008，15，4： | 1 |
| 9 | Molecular group dynamics study on slip flow of thin fluid film based on the Hamaker hypotheses显示文摘The thin fluid film was assumed to consist of a number of spherical fluid molecular groups and the attractive forces of molecular group pairs were calculated by the derived equation according to the three Hamaker homogeneous material hypotheses. Regarding each molecular group as a dynamics individual, the simulation method for the shearing motion of multilayer fluid molecular groups, which was initiated by two moving walls, was proposed based on the Verlet velocity iterative algorithm. The simulations reveal that the velocities of fluid molecular groups change about their respective mean velocities within a narrow range in steady state. It is also found that the velocity slips occur at the wall boundary and in a certain number of fluid film layers close to the wall. Because the dimension of molecular group and the number of group layers are not restricted, the hypothetical thickness of fluid film model can be enlarged from nanometer to micron by using the proposed simulation method. | ZHOU JianFeng, SHAO ChunLei & GU BoQin College of Mechanical and Power Engineering, Nanjing University of Technology, Nanjing 210009, China | 2010 | Science China(Technological Sciences)2010，53，7： | 0 |
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