To provide a vortex pump that improves sealability of a channel and prevents production cost and rotational resistance from being increased due to improvement in sealability.
The vortex pump includes: a discoid impeller 4 pressurizing fluid by rotation thereof; a pump chamber 3 storing the impeller 4 therein; and a motor for rotating the impeller 4. In addition, the pump has the channel 10 where the fluid flows, on an outer peripheral side of the impeller 4 of the pump chamber 3. A protrusion 40 is disposed which is fixed on either plate surfaces 6 and 7 of the impeller 4 or a facing surface that faces the plate surfaces 6 and 7 at a position other than the channel 10 of a casing forming the pump chamber 3, and which protrudes to the other side. The protrusion 40 is arranged on the whole circumference of the impeller 4 and has flexibility on a projecting tip side.
FUKUDA TETSUYA
SEKI TAKAFUMI
Mizuhiji Katsuhisa
Takeshi Sakaguchi
Hidetoshi Kitade