Cylindrical pump device having a flexible blade member

A cylindrical pump device comprising:

• a cylindrical housing having a central axis thereof;
• a cylindrical rotational member received in said cylindrical housing for rotation around the central axis, said cylindrical rotational member including a solid cylindrical wall, a central hub and a plurality of flexible blades each extending from said central hub to said solid cylindrical wall for defining a plurality of chambers therebetween;
• a shaft provided within said cylindrical housing at a location aprat from the central axis for rotation of said cylindrical rotation memeber about said central hub;
• an inlet port and an outlet port each communicated to at least one of said chambers at a time during rotation of said cylindrical rotational member, whereby each of said chambers increases and decreases its folume during rotation of said cylindrical rotational member to introduce liquid through said inlet port and to discharge liquid through said outlet port;
• and a driving gear in the vicinity of said cylindrical housing, wherein said cylindrical rotational member has a driven gear disposed in association with said driving gear for said rotation.

A cylindrical pump device comprising:

• a cylindrical housing having a central axis thereof;
• a cylindrical rotational member received in said cylindrical housing for rotation around the central axis, said cylindrical rotational member including a solid cylindrical wall, a central hub and a plurality of flexible blades each extending from said central hub to said solid cylindrical wall for defining a plurality of chambers therebetween;
• a shaft provided within said cylindrical housing at a location apart from the central axis for rotation of said cylindrical rotational member about said central hub;
• and an inlet port and an outlet port each communicated to at least one of said chambers at a time during rotation of said cylindrical rotational member, whereby each of said chambers increases and decreases its volume during rotation of said cylindrical rotational member to introduce liquid through said inlet port and to discharge liquid through said outlet port;
• wherein a pair of passages communicated to a plurality of said chambers are formed between an inner surface of said cylindrical housing and an outer surface of said solid cylindrical wall, said pair of passages being communicated to said inlet port and outlet port, respectively.