| 摘要 |
<p>A dual pressure water pump 10 comprising a pump body 12, a low pressure impeller 16, a high pressure impeller 18, a pump priming system 20, a pump priming conduit 22 and a rear wear ring 24. The high pressure impeller 18 is provided within a cavity 32, defined by an impeller recess 34 and a cover plate 36. The rear wear ring 24 is provided between the low pressure impeller 16 and the inboard end of the cover plate 36. The pump priming conduit 22 comprises: first and second axial bores 42, 44 through the pump body 12; a radial bore 46 and two axial holes 48, 50 through the cover plate 36; an axial hole 52 through the rear wear ring 24; a cavity 54 between the rear wear ring 24 and the low pressure impeller 16; and axial holes 56 through the low pressure impeller 16, connecting the cavity 54 to the suction side of the low pressure impeller 16.</p> |
