(19)
(11) EP 4 733 597 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
08.07.2026 Bulletin 2026/28

(43) Date of publication A2:
29.04.2026 Bulletin 2026/18

(21) Application number: 26162182.5

(22) Date of filing: 28.10.2022
(51) International Patent Classification (IPC): 
F04D 29/46(2006.01)
 F04D 17/12(2006.01)
(52) Cooperative Patent Classification (CPC):
F04D 27/0238; F04D 17/122; F04D 27/0253; F04D 29/4213; F04D 29/444; F04D 29/464
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC ME MK MT NL NO PL PT RO RS SE SI SK SM TR

(30) Priority: 03.11.2021 US 202117453456

(62) Application number of the earlier application in accordance with Art. 76 EPC:
22204569.2 / 4177476

(71) Applicant: Trane International Inc.
Davidson, NC 28036 (US)

(72) Inventors:
  • JOHNSON, Jon C
    New Albin, 52160 (US)
  • HARRISON, Mark W
    Onalaska, 54650 (US)

(74) Representative: Haseltine Lake Kempner LLP 
One Portwall Square Portwall Lane
Bristol BS1 6BH
Bristol BS1 6BH (GB)

   


(54) INTERSTAGE CAPACITY CONTROL VALVE WITH SIDE STREAM FLOW DISTRIBUTION AND FLOW REGULATION FOR MULTI-STAGE CENTRIFUGAL COMPRESSORS


(57) Centrifugal compressors can incorporate a side stream flow of intermediate pressure vapor between stages of that compressor. The side stream flow can be controlled by a side stream injection port controlled by a throttle ring disposed between stages of the compressor. The throttle ring can allow or obstruct flow through the side stream injection port. The throttle ring can extend and retract in a direction substantially perpendicular to the direction of flow from the first stage impeller to the second stage impeller. A method of operating a centrifugal compressor can include actuating a throttle ring by rotating a drive ring to adjust a flow of interstage fluid into the second stage impeller.







Search report












Search report