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五、性能关系 1.p-V关系首先,对机械密封来说,在正常运转时其磨损率保持不变(即u=常数),也即P_b V值为一定值,则p_b与V值之间的关系为双曲线(图1中虚线所示的u=k’p_bV=常数曲线)。然而,在一般机械密封中,往往是P_b~mV~n值为一定值,则p_b与V值之间的关系是指数曲线(图中实线所示的u=k’p_b~mV~n=常数—m>n曲线)。同时在低速下,因为密封面材料受到强度、变形和磨损的限制,P_b值不能无限制地升高(图中水平线为允许P_b值),同时速度不能太低,否则密封面间不能形成润滑所要
Fifth, the relationship between performance 1.pV relationship First of all, the mechanical seal, the wear rate in normal operation remains unchanged (ie, u = constant), that is, P_b V value is a certain value, then between p_b and V The relationship is hyperbolic (u = k’p_bV = constant curve shown by dotted line in Fig. 1). However, in the general mechanical seal, the value of P_b ~ mV ~ n is always a constant value, and the relationship between p_b and V is exponential curve (u = k’p_b ~ mV ~ n = Constant-m> n curve). At the same time, at low speed, because of the sealing surface material is subject to the strength, deformation and wear restrictions, P_b value can not be unlimited increase (the horizontal line to allow P_b value), while the speed can not be too low, otherwise the sealing surface can not form a lubrication