Pump and electric drive motor unit |
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| 申请号 | US3754844D | 申请日 | 1972-07-27 | 公开(公告)号 | US3754844A | 公开(公告)日 | 1973-08-28 |
| 申请人 | BOSCH GMBH ROBERT; | 发明人 | NUSSER H; VAN EEDEN H; EBERT J; | ||||
| 摘要 | There is described a pump assembly which, in a unitary structure, comprises a pump proper and an electric pump drive motor, both contained in a common housing. The pump housing which is disposed within the common housing, has a bearing tube in which journals a shaft carrying the pump impeller and, spaced therefrom, a bell-shaped motor armature surrounding a substantial portion of the bearing tube. | ||||||
| 权利要求 | 1. A pump unit comprising A. an external housing having an inlet opening and an outlet opening, B. a pump housing contained in said external housing and formed of 1. a base plate, 2. an intermediate plate and 3. a bearing plate, all said plates being in a stacked relationship, C. a pump work chamber provided in said pump housing, D. a bearing tube affixed to said bearing plate and extending outwardly and away from said pump housing, E. a shaft journalling in said bearing tube and projecting beyond both ends thereof, F. a pump impeller situated in said pump work chamber and affixed to one end of said shaft and G. a bell-shaped motor armature affixed to said shaft beyond the end of said bearing tube remote from said pump housing, said motor armature surrounding a substantial length portion of said bearing tube and being exposed to the flow of liquid medium through said pump unit. 2. an intermediate plate and 2. A pump unit as defined in claim 1, said motor armature comprising A. a sleeve-shaped support having 2. a second portiOn integral with said first portion and surrounding said bearing tube with a clearance, B. a stack of sheet metal discs carried on said second portion of said sleeve-shaped support, C. a coil carried on said sleeve-shaped support and surrounding said stack of sheet metal discs, D. a collector affixed to said shaft adjacent said first portion of said sleeve-shaped support and E. a coherent envelope of synthetic material encasing said coil and at least one part of said collector. 3. A pump unit as defined in claim 1, said shaft having A. a first length portion extending within said bearing tube and having a reduced diameter to provide a clearance between said bearing tube and said shaft along said first length portion, B. a second length portion extending from said first length portion to one end of said bearing tube and constituting a bearing face in sliding engagement with said bearing tube and C. a third length portion extending from said first length portion to the other end of said bearing tube and constituting a bearing face in sliding engagement with said bearing tube. 3. a bearing plate, all said plates being in a stacked relationship, C. a pump work chamber provided in said pump housing, D. a bearing tube affixed to said bearing plate and extending outwardly and away from said pump housing, E. a shaft journalling in said bearing tube and projecting beyond both ends thereof, F. a pump impeller situated in said pump work chamber and affixed to one end of said shaft and G. a bell-shaped motor armature affixed to said shaft beyond the end of said bearing tube remote from said pump housing, said motor armature surrounding a substantial length portion of said bearing tube and being exposed to the flow of liquid medium through said pump unit. 4. A pump unit as defined in claim 1, including A. a tubular support structure made of synthetic material and surrounding said armature with a clearance, said tubular support structure having a plurality of circumferentially arranged depressions on its outer face, B. a plurality of permanent magnets forming part of said motor and nesting in said depressions and C. a tubular metal member made of a magnetically conductive material and tightly surrounding said tubular support structure, said tubular metal member and said tubular support structure being disposed in said external housing. 5. A pump unit as defined in claim 1, including an inlet nipple formed as an integral part of said external housing. 6. A pump unit as defined in claim 4, including an outlet nipple formed as an integral part of said tubular support structure and projecting outwardly from said external housing. 7. A pump unit as defined in claim 6, including a check valve situated in said outlet nipple. 8. A pump unit as defined in claim 1, said external housing having a rotationally symmetrical configuration; said base plate, said intermediate plate and said bearing plate having a circular outline. 9. A pump unit as defined in claim 1, at least said base plate and said intermediate plate being made of sintered steel. |
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