Patent ID: 6095770
Filing Date: 2000-08-01
Classification: F04D,F05B,H02K

Abstract:
A magnetically coupled pump comprising:a housing having a pump chamber and a motor chamber with a partition wall provided therebetween;a rotating shaft inserted into a shaft-receiving portion provided in said partition wall, said rotating shaft having an enlarged diameter end portion formed around one top end portion thereof, said enlarged diameter end portion having balance holes formed to communicate both end faces of said enlarged diameter end portion;a stator of a motor disposed in said motor chamber;an impeller fixed to said enlarged diameter end portion of said rotating shaft into said pump chamber;an annular permanent magnet fixed to said impeller on a side facing said partition wall to form a part of a rotor of said motor; anda bearing provided in said shaft-receiving portion for supporting said rotating shaft, and comprising a thrust bearing formed at one end of said bearing on a side facing said partition wall,said thrust bearing having a thrust bearing face disposed to contact an end face of said enlarged diameter end portion of said rotating shaft on a side facing said partition wall, and said balance holes being disposed so as to partially overlap with said thrust bearing face in said end face of said enlarged diameter end portion on a side facing said partition wall.