Simulation Analysis Of The Effect Of Gasket Structure And Material On The Sealing Performance For Plate Heat Exchangers

Plate heat exchanger is an efficient and environmentally friendly heat exchange machine.It has the characteristics of compact equipment,simple installation,small size and high efficiency.It has important applications in the fields of machinery,chemical industry,power supply,heating,and pharmaceuticals.Therefore,in order to improve the working efficiency of plate heat exchangers,prolong the service life,improve energy conservation and environmental protection,the research of plate heat exchangers plays an increasingly important role in the world economy.Gasket is one of the important parts of plate heat exchanger,and it is the most vulnerable part of the whole equipment.It determines the working pressure,medium corrosion and working temperature that the plate heat exchanger can withstand.The entire sealing system If there is a leak,the entire plate heat exchanger needs to be shut down for maintenance.Therefore,the role of sealing gaskets in plate heat exchangers is particularly prominent.At present,sealing gasket materials and sealing structure design have attracted great attention from manufacturing enterprises and become one of the key technical issues of major research.This paper comprehensively uses the large deformation nonlinear theory,viscoelastic mechanics and other theories and finite element analysis technology to simulate and analyze the influence of different materials and structural parameters of the sealing gasket on the sealing performance.The main research results are as follows:(1)Analyzed gaskets with different structures(rectangular section,hexagonal section,pentagonal section and curved section)under different compression rates,the shape change of gaskets,the distribution of mises stress,the distribution of contact stress and the change for the contact width of the main contact sealing face provide a certain technical guidance for the design of the sealing gasket of the plate heat exchanger.(2)According to the analysis of the mises stress distribution,the contact stress distribution and the change for the contact breadth of the main contact sealing surface under different compression ratios of the gaskets with different structures.Comprehensively considering the advantages of various sealing gasket structures,a new type of sealing gasket structure is designed.The numerical analysis results show that its sealing performance is improved under the condition of the same cross-sectional area.(3)When the cross-sectional shape of the gasket is constant,the hardness of the material will not change the distribution of the internal stress field of the gasket during preloading.Under the same compression rate,as the hardness of the material increases,the internal mises stress of the gasket will not change.The stress and the contact normal stress of the sealing face will become larger.(4)For the designed new type of gasket,the effective contact width on the main sealing surface of the gasket is used as the assessment criteria of sealing property,and the main structural parameters of the gasket have been optimized and analyzed.The order of the influence of each structural parameter on the sealing property and the optimum combination form of the main structural parameters within the set range are given.