公开(公告)号：WO1996000312A1

公开(公告)日：1996-01-04

申请号：PCT/IB1995000512

申请日：1995-06-23

Applicant: INGERSOLL-DRESSER PUMP COMPANY

Inventor： INGERSOLL-DRESSER PUMP COMPANY ,  McCAUL, Colin ,  FUMAGALLI, Vincenzo

IPC: C22C38/38

CPC classification number: F04D29/2277 ,  C22C38/38 ,  F05C2201/90

Abstract: A fluid impeller for applications requiring superior cavitation erosion resistance. The impeller has a body fabricated from a castable metastable austenitic steel alloy which has a chemical composition in the range according to table (I), the balance comprising iron and impurities. The preferred range is 17.5-18.5 % chromium, 0.5-0.75 % nickel, 0.45-0.55 % silicon, 0.2-0.25 % nitrogen, 15.5-16.0 % manganese and 0.1-0.12 % carbon. Quantitative testing has shown cavitation resistance of four to six times that of standard boiler feed pump materials. A method for making cavitation resistant fluid impellers is also disclosed.

Abstract translation: 用于需要优异的抗气蚀侵蚀性能的流体叶轮。 叶轮具有由可浇铸的亚稳态奥氏体钢合金制成的主体，其具有根据表（I）的范围的化学组成，余量包括铁和杂质。 优选的范围是17.5-18.5％的铬，0.5-0.75％的镍，0.45-0.55％的硅，0.2-0.25％的氮，15.5-16.0％的锰和0.1-0.12％的碳。 定量试验显示，空化抗性是标准锅炉给水泵材料的四到六倍。 还公开了一种制造抗气蚀的流体叶轮的方法。

公开(公告)号：WO1997023732A1

公开(公告)日：1997-07-03

申请号：PCT/US1996020248

申请日：1996-12-23

Applicant: INGERSOLL-DRESSER PUMP COMPANY

Inventor： INGERSOLL-DRESSER PUMP COMPANY ,  PATON, Alan ,  SCHIAVELLO, Bruno ,  RIGAMONTI, Giovanni

IPC: F04D29/22

CPC classification number: F04D29/2277 ,  F04D29/242

Abstract: A fluid impeller (100) for a centrifugal pump includes a hub (105) having a substantially disk-like form with a center and an edge, circular symmetry, and provosion for being rotatably driven. A first plurality of pumping vanes (110) projects substantially perpendicularly from a first surface of the hub and extends radially outwardly from a locus (210) near the center of the hub to another locus (150) near the edge of the hub. These vanes (110) provide a high pressure head with a small impeller diameter. A second plurality of separate and twisted inlet vanes (120) also projects substantially perpendicularly from the first surface of the hub and extends radially outwardly to the locus (210) near the center of the hub from another locus (220) nearer the center of the hub. The separate second plurality of vanes (120), by turning and pre-pressurizing the fluid, provides an impeller having capability of cavitation-free pumping at low net positive suction head (NPSH). A front shroud (180) can be used which partially or totally covers the first and/or second plurality of vanes.

Abstract translation: 用于离心泵的流体叶轮（100）包括具有基本上圆盘形的轮毂（105），其具有中心和边缘，圆形对称性和用于可旋转地驱动的凸起。 第一组多个泵叶片（110）从毂的第一表面基本上垂直地突出，并且从靠近轮毂中心的轨迹（210）径向向外突出到靠近轮毂边缘的另一轨迹（150）。 这些叶片（110）提供具有小叶轮直径的高压头。 第二组多个独立和扭转的入口叶片（120）也从毂的第一表面基本上垂直地突出，并且从靠近轮毂中心的另一个轨迹（220）径向向外延伸到靠近轮毂中心的轨迹（210） 枢纽。 单独的第二多个叶片（120）通过转动和预加压流体，提供具有在低净正吸头（NPSH）下无空化泵送能力的叶轮。 可以使用部分或全部覆盖第一和/或第二多个叶片的前护罩（180）。