| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high quality and a long life pump, in a Wesco type electric well pump having a possibility of sucking up foreign substances such as sand and the like.SOLUTION: A Wesco type pump includes: an electric motor 1; an impeller 2; a casing 3 provided around the impeller 2; and a casing cover 11 fitted to the casing 3 so as to cover the entire surface of the impeller 2. The casing 3 includes: a swirl chamber 4 around the impeller 2; a suction port side water passage 5 including a suction port 7 for communicating with the swirl chamber 4; and a discharge side water passage including a discharge port 8. A dent 12 is provided at a connection part between the suction port side water passage 5 and the swirl chamber 4. Thus, the electric pump strong against foreign substance contamination can be provided which prevents falling of foreign substances into the dent 12 and damage in the swirl chamber 4 caused by the foreign substances such as sand and the like.</p> |
