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A vortex flow blower including a blower casing having an annular flow passageway extending from an inlet port for receiving fluid to an outlet port for discharging the fluid, the outlet port being disposed adjacent to the inlet port, and an impeller accommodated in the blower casing for producing a

A vortex flow blower including a blower casing having an annular flow passageway extending from an inlet port for receiving fluid to an outlet port for discharging the fluid, the outlet port being disposed adjacent to the inlet port, and an impeller accommodated in the blower casing for producing a vortex flow of the fluid in the annular flow passageway. The vortex flow blower is configured for enabling at least one of noise reduction pressure increase and reduction of power requirements of the vortex flow blower, by providing at least one of sectional area reducer for reducing a sectional area of the annular flow passageway which annular flow passageway includes an annular groove disposed in facing relation to vanes of the impeller, and a partition wall partitioning a part of the circumference of the annular groove so that the inlet port and the outlet port being provided at opposite end portions of the annular groove partitioned by the partition wall with the sectional area reducer is disposed at a position of the annular passageway located between the outlet port of the annular passageway and a midpoint between the inlet port and the outlet port of the annular passageway, and an auxiliary flow supply path for supplying an auxiliary flow of the fluid introduced to the annular flow passageway from the inlet port so as to conduct the fluid in a direction to form the vortex flow.

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A vortex flow blower including a blower casing having an annular flow passage extending from an inlet port for receiving fluid to an outlet port for discharging the fluid, the outlet port being disposed adjacent to the inlet port, and an impeller accommodated in the blower casing for producing a vor

A vortex flow blower including a blower casing having an annular flow passage extending from an inlet port for receiving fluid to an outlet port for discharging the fluid, the outlet port being disposed adjacent to the inlet port, and an impeller accommodated in the blower casing for producing a vortex flow of the fluid in the annular flow passageway, means for driving the impeller, and enabling means for enabling at least one of noise reduction, pressure increase, and reduction of power requirements of the vortex flow blower, the enabling means including at least one of sectional area reducing means for reducing a sectional area of the annular flow passageway, the annular flow passageway including an annular groove disposed in facing relation to vanes of the impeller, and a partition wall partitioning a part of the circumference of the annular groove, the inlet port and the outlet portion being provided at opposite end portions of the annular groove partitioned by the partition wall, and at least one of (a) the sectional area reducing means being disposed at a position of the annular passageway located between the outlet port of the annular passageway and a midpoint between the inlet port and the outlet port of the annular passageway, and (b) means forming an auxiliary flow supply path being disposed for supplying an auxiliary flow of the fluid introduced to the annular flow passageway from the inlet port so as to conduct the fluid in a direction to form the vortex flow.