The Stress Of The Vacuum Glass Under Atmospheric Pressure And Temperature Conditions And Heat Transfer Characteristics Research

Vacuum glass is a kind of typical good insulation,good aging resistance,high light transmittance and good infrared reflective characteristics of new type energy-saving of transparent insulation material.Vacuum plate glass technology field of saving energy and reducing consumption in the future whether to walk in the forefront of the world,must carry on the system detailed research,more in-depth discussion.Based on the research of vacuum plate glass in the support column spacing,chamfering,glass thickness,material parameters such as temperature difference and shores of conditions,it is concluded that the deformation and stress distribution of vacuum glass,eventually found the optimal vacuum glass structure,design and upgrade for the future of vacuum glass has a guiding role and positive significance.The main research contents and results are as follows:(1)based on four kinds of structure parameters of the vacuum glass in atmosphere environment stress characteristic analysis,the following conclusions:(1)thickness of 3.2 mm,support column without the chamfer,support column spacing is 40 mm glass in the glass plate tensile stress of the support column for 16 MPa—22 MPa,support pillar stress-869MPa—-869 MPa.And the support column spacing is 30 mm glass in the support column glass plate tensile stress is 6—7MPa,the support column stress is-479MPa—-506 mpa,greatly reduced.At the same time,the maximum stress in the glass is 23.494 MPa,and the support column stress is 815.287 mm,which meets the requirements of compressive strength.The spacing of the supports is 40 mm,the thickness of the glass plate is 3.2 mm,the deformation of the non-chamfer glass is 0.0198 mm,the deformation of the chamfer is 0.0204 mm,and the deformation of the chamfer is small.(3)to support spacing is 40 mm,supports no chamfer,thickness of 3.2 mm,the glass plate tensile stress of the support column for the 16—22MPa,the support pillar stress-for-869-869 MPa,,and 2 mm thick plate glass plate tensile stress of the support column of 46-54 MPa,pillar stress-for-810MPa—810 MPa,caused by the plate is too thin values are larger.At the same time,according to the design criterion,the tensile stress is not more than 102.44 Mpa,and the compressive stress is not exceeding 638.49 Mpa,which also meets the requirements.Therefore,the comprehensive analysis and study,in an atmospheric pressure environment,the spacing of the supporting objects is 30 mm and no chamfer,and the substrate thickness is 3.2 mm and the vacuum glass structure is the best.(2)by means of vacuum glass heat transfer temperature difference environment characteristics and structure design of simulation analysis,the following conclusions:(1)under the same coefficient of thermal conductivity,the support column spacing 40 mm glass heat transfer coefficient is 0.21,and the support column spacing 30 mm glass heat transfer coefficient is 0.44,much larger than 40 mm glass,this may be because of the support column spacing is small,the more the number,the greater the contact area,led to the greater the heat transfer coefficient U value.(2)for chamfering span 40 mm shores of stainless steel vacuum glass,when temperature is 100 ?,without the glass plate stress of the support column is 36 to 46 MPa,and when temperature is 20 ?,stress only 11-21 MPa,shows that temperature difference is small,the deformation is small,small stress on the surface of the glass.At the same time,we can see that under different temperature conditions,the heat transfer coefficient U value is constant,which is 0.6,which is not affected.So,the difference in temperature difference has no effect on U value,but the distance between the supports is larger and U value will be smaller,the better the structure.(3)through a standard atmospheric pressure and vacuum glass under 100 ? condition of simulation analysis and structure optimization,the temperature is 100 ?,the load for a under atmospheric pressure,the deformation of support column spacing 40 mm glass is 0.04385 mm,the glass plate pressure stress of the support column for-50 MPa—12 MPa,and the deformation of support column spacing 30 mm glass is 0.04097 mm,the glass plate pressure stress of the support column to-5MPa—30 MPa,because of the small spacing,support number,the deformation is small,reduce the stress of the object.(2)the greater the support column spacing,the smaller the U value at the same time,the chamfer on the shores of cases,the support column material for ZrO2 vacuum glass heat transfer coefficient is 0.235,but the support material for stainless steel U value is 0.6,30 mm glass and shores U value is 0.84,much more,than this is due to the material ZrO2 is better than stainless steel heat insulation effect,cause U value is smaller,Zr O2 cost is expensive,but the material is not applicable to mass production.Outside the temperature 100 ?,so comprehensive analysis,load 1 under atmospheric pressure,choose pillar spacing for 30 mm vacuum glass structure is best,but also conform to the requirements of the product lightweight.