公开(公告)号：EP2951440A1

公开(公告)日：2015-12-09

申请号：EP13873896.8

申请日：2013-12-04

Applicant: Danfoss A/S

Inventor： BRASZ, Joost ,  RASMUSSEN, Mogens

IPC: F04D17/08

CPC classification number: F04D27/009 ,  F04D17/122 ,  F04D27/0215 ,  F04D27/0238 ,  F04D29/444 ,  F05D2250/52 ,  F25B1/053 ,  F25B1/10 ,  F25B2600/0253 ,  F25B2600/0262 ,  Y02B30/741

Abstract: This disclosure relates to a centrifugal compressor. In a first example, the compressor includes a first impeller provided in a main refrigerant flow path, a second impeller provided in the main refrigerant flow path downstream of the first impeller, and a recirculation flow path. In the first example, the recirculation flow path is provided between a first location and a second location along the main refrigerant flow path. The first location is downstream of the second location, and the second location is downstream of the first impeller. In a second example, the compressor includes an impeller provided in a main refrigerant flow path, and a recirculation flow path provided between a first location and a second location along the main refrigerant flow path. In the second example, the recirculation flow path includes a recirculation volute. Further disclosed is a method for operating a centrifugal compressor.

公开(公告)号：EP3069089A1

公开(公告)日：2016-09-21

申请号：EP14861633.7

申请日：2014-11-14

Applicant: Danfoss A/S

Inventor： SUN, Lin ,  QUITALEG, Salvador ,  BRASZ, Joost

IPC: F25B1/04 ,  F25B1/00 ,  F04D23/00 ,  F04D17/12

CPC classification number: F04D17/122 ,  F04D27/0207 ,  F04D27/0238 ,  F25B1/053 ,  F25B1/10 ,  F25B41/04 ,  F25B2400/07 ,  F25B2400/13

Abstract: One exemplary embodiment of this disclosure relates to a centrifugal refrigerant compressor system. The system includes a condenser, an evaporator, and an economizer between the condenser and the evaporator. The system further includes a centrifugal compressor having a first impeller and a second impeller downstream of the first impeller. The compressor includes at least one port. Fluid from a recirculation flow path and an economizer flow path is introduced into a main flow path of the compressor by way of the at least one port.

公开(公告)号：EP3069089B1

公开(公告)日：2020-08-05

申请号：EP14861633.7

申请日：2014-11-14

Applicant: Danfoss A/S

Inventor： SUN, Lin ,  QUITALEG, Salvador ,  BRASZ, Joost

IPC: F25B1/04 ,  F25B1/00 ,  F04D23/00 ,  F04D17/12

公开(公告)号：EP2951440B1

公开(公告)日：2019-07-31

申请号：EP13873896.8

申请日：2013-12-04

Applicant: Danfoss A/S

Inventor： BRASZ, Joost ,  RASMUSSEN, Mogens

IPC: F04D17/12 ,  F04D27/02 ,  F04D29/44 ,  F25B1/10 ,  F25B1/053

公开(公告)号：EP2635772B1

公开(公告)日：2019-05-29

申请号：EP10859363.3

申请日：2010-11-03

Applicant: Danfoss A/S

Inventor： SUN, Lin ,  BRASZ, Joost

IPC: F01D17/08 ,  F04D27/02 ,  F01D5/14

公开(公告)号：EP2655890B1

公开(公告)日：2019-01-23

申请号：EP10860902.5

申请日：2010-12-22

Applicant: Danfoss A/S

Inventor： SUN, Lin ,  BRASZ, Joost

IPC: F04D29/44

公开(公告)号：EP2823240B1

公开(公告)日：2018-11-14

申请号：EP12870829.4

申请日：2012-03-08

Applicant: Danfoss A/S

Inventor： SUN, Lin ,  BRASZ, Joost

IPC: F25B13/00 ,  F25B1/053 ,  F04D25/06 ,  F04D27/00 ,  F04D29/048 ,  F04D17/12 ,  F25B1/10 ,  F04D29/46

CPC classification number: F25B30/02 ,  F04D17/122 ,  F04D25/06 ,  F04D27/002 ,  F04D27/004 ,  F04D29/048 ,  F04D29/462 ,  F25B1/053 ,  F25B1/10 ,  F25B13/00 ,  F25B41/046 ,  F25B2600/0253 ,  Y02B30/741

Abstract: A heat pump system includes a refrigerant circuit. First and second heat exchangers are arranged in the refrigerant circuit. A flow reversing device selectively changes a direction of flow in the refrigerant circuit between the first and second heat exchangers. A centrifugal compressor is arranged in the fluid circuit and has first and second impellers arranged in series relative to one another to provide a desired compressor pressure ratio. In one example, the centrifugal compressor mounts the first and second impellers on opposing ends of a shaft. The first and second impellers respectively include first and second stage inlets and outlets. One example desired compressor pressure ratio of at least 10:1 corresponds to a second stage outlet pressure to a first stage inlet pressure. A first diffuser is arranged at the first stage outlet, and the first diffuser is a variable geometry diffuser.