| 摘要 |
A centrifugal pump 100 comprises a housing 140 having an open end covered by a rear cover 120 and a front cover 110 overlapping each other. A driven magnetic member 124 is rotatably disposed around a fixed central shaft 121, and is enclosed by an enclosure 123 which is an extension of an impeller 125 disposed within a space between the rear and front covers 120, 110. A driving magnetic member 130 is connected to a motor 141 and is disposed in fluid isolation from the driven member 124. A bushing 122 with internal and external cooling grooves (127, 128 Fig. 2) formed thereon is provided between the fixed shaft 121 and the driven member enclosure 123, and a fluid passage 190 is defined along the enclosure 123 to conduct the pumped fluid to the cooling grooves (127, 128) of the bushing 122 and to force the fluid to flow therethrough and then circulate back to the impeller 125 so as to dissipate heat generated between the shaft and the bushing 122. The bushing further includes a jacket (150, Fig. 3) surrounding the bushing wherein the jacket includes internal slots (151) which form with the external grooves (128) of the bushing cooling fluid flow ducts. A resilient V-shaped cross-section ring 160 is provided on both ends of the bushing 122 to absorb thrust generated by the bushing during operation of the pump 100. <IMAGE>
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