主权项 |
1. A structure improvement of a pump casing with polyfluoroalkoxy (PFA) liner, the pump casing with PFA liner comprising a suction casing and a volute casing which are formed separately, both of a suction PFA liner of the suction casing and a volute PFA liner of the volute casing being formed by injection molding; the suction casing and the volute casing being formed separately by injection molding so as to eliminates a tensile stress between the suction PFA liner and the volute PFA liner and reduces a defect rate of manufacturing a liner of a large single pump casing by injection molding, wherein:
the suction casing comprises a suction flange, a shaft support, a suction channel and the suction PFA liner, the suction flange, the shaft support and the suction channel are integrally formed; the volute casing comprises a volute channel, a discharge channel, a discharge flange and the volute PFA liner; and wherein the suction casing is assembled to the volute casing with a metal mounting surface of the suction casing and a metal mounting surface of the volute casing connected to each other so as to form the pump casing with PFA liner, the shaft support which is integrally formed with the suction flange and the suction channel so as to increase stiffness, and a thrust ring seat is formed at a connecting area of the suction casing and the volute casing. |