Patent ID: 6805529
Filing Date: 2004-10-19
Classification: F04D

Abstract:
A complex mechanical seal for vertical multiple stage pump having the balance effect of the vertical pushing force, comprising:a fixed plate positioned in the vertical multiple stage pump further comprising: a mechanical seal region formed in the inner wall, and having a bottom hole for the passage of a pump axle; a hollow cylinder fixed plate formed by a long axle bushing of the fixed pump axle; and a balance plate becoming one part assembly, the circumference of said balance plate having a promotion flange; a sliding sealed surface formed by the surface and the inner wall surface to be coupled to form a gap, to divide mechanical seal house into a high pressure region formed at the lower part and a low pressure region formed at the upper part; a mechanical seal fixed on the long axle bushing of the fixed plate whereby to block the leakage of transporting liquid, and a return water passage positioned on the low pressure region of the upper part of the balance plate so that the high pressure region of the lower part of balance plate to form the pushing force whereby to balance the resultant force by down forward vertical pushing force of the blade wheel.