To explore the relationship between the magnetic fluid sealing performance of safety valves and the key parameters of the structure.Using a conventional magneto-fluidic seal as the research object,the variation of magnetic induction intensity within the seal gap is calculated using finite element analysis software.The pressure resistance in the seal gap is calculated and analyzed under different key parameters of the seal structure,and finally the interconnection between the parameters is obtained to provide guidance for improving the sealing capacity.The results show that the maximum value of sealing pressure is at 2 mm of tooth width when the width of tooth groove is 3 mm;the maximum value of sealing pressure is at 2.5 mm when the width of tooth is 3 mm;changing the rectangular tooth to 30° of unilateral beveled tooth will increase the overall sealing pressure and the maximum value of sealing pressure is at 3 mm of tooth groove width and 1.5 mm of tooth width;changing the size of remanent magnetism will affect the magnetic induction.While when the remanent magnetic strength is changed,the difference of magnetic induction strength remains unchanged,the change of remanent magnetic strength has no effect on the optimal value of sealing pressure.These laws provide a theoretical reference for the design of magnetic fluid sealing devices for safety valves.
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