公开(公告)号：WO2022119709A1

公开(公告)日：2022-06-09

申请号：PCT/US2021/059600

申请日：2021-11-17

Applicant: DANFOSS A/S

Inventor： YAN, Jin ,  HARTZOG, Kevin Patrick ,  ZHANG, Tianli

IPC: F04D29/44 ,  F04D17/10 ,  F04D29/66 ,  F04D29/54

Abstract: A refrigerant compressor according to an exemplary aspect of the present disclosure includes, among other things, a diffuser including grooves configured to resist backflow of refrigerant. The compressor is used in a heating, ventilation, and air conditioning (HVAC) chiller system, for example.

公开(公告)号：WO2022225743A1

公开(公告)日：2022-10-27

申请号：PCT/US2022/024374

申请日：2022-04-12

Applicant: DANFOSS A/S

Inventor： ZHANG, Tianli ,  YAN, Jin ,  URCIA, Jose Manuel

IPC: F04D29/42 ,  F04D29/00 ,  F04D29/40 ,  F04D29/44 ,  F04D29/66 ,  F04D29/68

Abstract: A refrigerant compressor and a method of operating said refrigerant compressor. The refrigerant compressor may comprise: a shrouded impeller including a passageway permitting refrigerant to flow from a location radially outside a shroud of the shrouded impeller to a location radially inside the shroud. The method may comprise: operating refrigerant compressor including a shrouded impeller such that the shrouded impeller rotates within a housing; and directing leakage flow between the shrouded impeller and the housing back into the shrouded impeller through a passageway extending radially through a shroud of the shrouded impeller.