| Mechanical seal is an indispensable important device in rotating equipment,the seal plays an important role in ensuring the safe operation of machinery and equipment,although it is not very bulky.The structure of the mechanical seal is not complicated,wherein the seal pair is the key component of the entire mechanical seal structure,and often the seal pair deforms due to the heat generated by the friction between the seal pair static and dynamic rings;and secondly,the Seal deformation is also caused by flushing cooling liquid into the seal pair.Based on the actual operation of the 150CZY15 bottom oil slurry pump mecha-nical seal,this paper studied the original mechanical seal structure and auxiliary sealing system of the slurry pump,and analyzed the failure forms of the seal structure.It put forward the improvement of dry gas seal technology for original seal of oil slurry pump,designed a new type of dry gas sealing structure in combination with the working conditions of the slurry pump,and analyzed the structure of the newly designed dry gas seal.The dry gas of the slurry pump was introduced.The working principle of the seal and the design of the flushing scheme and other auxiliary sealing systems were designed,and the technical advantages of the dry gas seal of the slurry pump were analyzed.The detailed calculation of the seal ring and spring of the newly designed dry gas seal structure of the slurry pump was carried out.According to the operating conditions of the slurry pump,three kinds of unidirectional groove(helical groove,arc groove,herringbone)seal ring were designed.And a comprehensive heat-fluid coupling analysis was performed for the three ring grooves with different groove depth and different number of grooves.On account of the numerical analysis of the fluid-structure interaction,the control equations(continuity equation,momentum equation,viscous fluid flow equation)for the flow field of the unidirectional groove dry gas seal were deduced.The boundary conditions and discretization of the flow field control equation are introduced.The method for solving the discretization equation is given.By simplifying the thermal analysis model,a method suitable for the thermal analysis of the unidirectional groove seal dynamic ring is given;The conditions were introduced,the heat flux and convective heat transfer coefficients of the thermal boundary conditions needed to be calculated,and the heat distribution of the sealed static and dynamic rings were calculated.The calculation method of the thermal stress field was introduced.Combined with the theory of thermo-fluid-solid coupling analysis,a three-dimensional model and a gas film model with three uni-directional grooves(different groove depths anddifferent number of grooves)were established using Solid Works.The flow field analysis of the established film was performed using ANSYS Workbench software.The cloud distribution of the film pressure distribution is obtained;the steady-state thermal analysis of the seal ring is performed to obtain the cloud distribution of the temperature distribution of the seal ring;the deformation of the seal ring and the stress and strain caused by the film pressure are analyzed without applying the temperature..Then,after the temperature field is applied,the effects of temperature and film pressure on the stress,strain and deformation of the seal ring are analyzed.Comprehensively compare the deformation of the seal ring under different working conditions.The same groove depth,number of slots,and sealing ring of different groove types The deformation caused by the same boundary conditions is different;the results obtained for the groove type,groove depth,and groove number under the same conditions for any two variables are also different.Through comprehensive analysis,the groove type,number of slots,and groove depth of the dry gas seal face ring suitable for the design of the slurry pump are optimized.At the same time,it provides ideas for the further comprehensive analysis of sealed end face grooves. |
PDF Full Text Request