US 2007/0178001 A1Published application

Scroll fluid machine

AssigneeAnest Iwata Corporation

InventorsNaohiro Minekawa, Masatomo Tanuma, Yuki Takada, Minako Toda

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Abstract

In a scroll fluid machine, a driving shaft extends axially to allow an orbiting scroll to revolve with respect to a fixed scroll thereby compressing a gas introduced from the outer circumference of the fixed scroll in a compressing chamber formed between the orbiting and fixed scrolls. From one end of the driving shaft, external air is introduced in a cooling hole extending axially of the driving shaft to cool the driving shaft. A cooling fan is rotatably secured at one end of the driving shaft to rotate by the driving shaft to cool the fixed scroll. The cooling fan comprises a base plate having a main fin on one side surface facing the side of the fixed scroll and a plurality of auxiliary fins on the other side surface to prevent cooling-finished air from invading into the cooling hole of the driving shaft.

Claims4

Dependent claims

A scroll fluid machine comprising:

a driving shaft having an eccentric axial portion at one end and having an axial cooling hole through which cooling external air sucked from a front end flows to cool the driving shaft and is discharged from a rear end;
a fixed scroll having a spiral fixed wrap;
an orbiting scroll having a spiral orbiting wrap which engages with the fixed wrap to form a compressing chamber between the fixed and orbiting wraps, the orbiting scroll being rotatably secured around the eccentric axial portion of the driving shaft;
and
a cooling fan rotatably secured on the driving shaft and comprising a base plate that has a main fin on a rear surface and a plurality of auxiliary fins on a front surface, the driving shaft enabling the cooling fan to rotate to cool a side of the fixed scroll by the main fin, said plurality of auxiliary fins preventing cooling-finished air from invading into the cooling hole of the driving shaft.

2 more elements

Dependencies are inferred from the claim text.