| 摘要 |
A rotary blower (11) of the backflow type is disclosed including a housing portion (50), an inlet end wall portion (49), and a bearing plate (15), the housing portion defining cylindrical chambers (31,33) within which are disposed meshed rotors (35,37). The inlet end wall portion (49) defines an inlet port (51), and the housing portion (50) defines an outlet port (53) including a port end surface (59). The bearing plate (15) defines an end surface (29) and a relief chamber including a relief surface (29R), and the port end surface (59) is disposed in a plane defined by the relief surface (29R). As a result, resistance to the transfer of air through the blower is reduced, thus reducing required drive horsepower, and increasing the isentropic efficiency of the blower.
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