| CPC F04C 18/0215 (2013.01) [F04C 2240/30 (2013.01)] | 17 Claims |

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1. A moving scroll comprising:
a moving base plate (50), provided with a shaft seat (52) with an axis as its shaft center, the moving base plate (50) comprising a first side (501) and a second side (502) which are opposite each other in a direction of the axis, the shaft seat (52) being disposed at the second side (502);
a moving scroll wall (54), integrally formed at the first side (501) of the moving base plate (50), the moving scroll wall (54) extending around the axis from a position near the axis in a direction away from the axis, the moving scroll wall (54) having an end face (540), the end face (540) being located at the end of the moving scroll wall (54) that is opposite the moving base plate (50) in the direction of the axis, and a collection groove (542) being disposed on the end face (540);
a channel (56) running in the direction of the axis is disposed between the collection groove (542) and the second side (502), the channel (56) and the collection groove (542) being connected at a first port (561), the channel (56) running through the second side (502) at a second port (562), the collection groove (542) extending from the first port (561) to a collection end (544) in a direction towards the center of the moving scroll, and the collection groove (542) extending not less than 60 degrees and not more than 400 degrees around the axis from the first port (561) to the collection end (544);
wherein the collection groove (542) terminates at the first port (561).
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