公开(公告)号：WO1993001417A1

公开(公告)日：1993-01-21

申请号：PCT/DK1992000203

申请日：1992-06-29

Applicant: DANFOSS A/S ,  FRIEDRICHSEN, Welm

Inventor： DANFOSS A/S

IPC: F15B13/043

CPC classification number: F15B11/165 ,  F15B21/087 ,  F15B2211/20546 ,  F15B2211/30525 ,  F15B2211/30535 ,  F15B2211/3111 ,  F15B2211/327 ,  F15B2211/6054 ,  F15B2211/63 ,  F15B2211/6309 ,  F15B2211/6313 ,  F15B2211/634 ,  F15B2211/6346 ,  F15B2211/7054 ,  F15B2211/7058 ,  F15B2211/7135

Abstract: A hydraulic system has a pump (1) with at least one load (4, 5) and accompanying bi-directional valves (8, 8a). A first comparator (A) establishes which motor line (6, 7) is carrying the higher load pressure. A second comparator (B) establishes whether the input-side motor line (6, 7) allocated a directional signal identifying the direction of the valve displacement is carrying the higher pressure or whether a load (4, 5) is being operated with negative loading. Depending on the result of the comparison, the load pressure signal (y1, y2) can be processed differently.

公开(公告)号：WO2022184288A1

公开(公告)日：2022-09-09

申请号：PCT/EP2021/075221

申请日：2021-09-14

Applicant: DANFOSS A/S

Inventor： LARSEN, Sigurd ,  PAWLIK, Jens ,  FOCK, Clemens

IPC: F25B41/325 ,  F25B41/34 ,  F25B5/02 ,  F25B6/02

Abstract: The present invention pertains to an active balancing valve for a refrigeration and/or air-conditioning application. The valve comprises a valve housing (1) with an inlet orifice (11), an outlet orifice (12) and a mounting portion (13), a main valve element with a main pressure balance orifice and a control element at least partially defining a pressure balance passage. Each element is slidable inside the valve housing and comprises a control surface for controlling a fluid flow between the inlet orifice and the outlet orifice. The control element closes the main pressure balance orifice of the main valve element in a closed state of the valve.

公开(公告)号：WO2021221806A1

公开(公告)日：2021-11-04

申请号：PCT/US2021/022462

申请日：2021-03-16

Applicant: DANFOSS A/S

Inventor： SUN, Lin Xiang ,  LI, Tianlei ,  PRITCHARD, Brandon Keith

IPC: F25B31/00 ,  F25B5/02 ,  F25B5/04 ,  F04B39/06 ,  H02P1/28 ,  F25B49/02 ,  H02K5/22

Abstract: This disclosure relates to refrigerant compressors, and, in particular, relates to cooling for the power electronics of such compressors. An example refrigerant system includes a main refrigerant loop in communication with a condenser, an evaporator, and a compressor. The refrigerant system further includes at least one cooling line configured to direct refrigerant from the main refrigerant loop to cool a chamber containing electronic components. A method is also disclosed.

公开(公告)号：WO2021183170A1

公开(公告)日：2021-09-16

申请号：PCT/US2020/040225

申请日：2020-06-30

Applicant: DANFOSS A/S

Inventor： LI, Tianlei ,  GONZALEZ, Delvis Anibal

IPC: H02K1/27

Abstract: An electric machine according to an exemplary aspect of the present disclosure includes, among other things, an electric machine including a rotor having a sleeve radially outside a permanent magnet. Further, the sleeve includes at least one magnetic arc segment and at least one non-magnetic arc segment.

公开(公告)号：WO2021175565A1

公开(公告)日：2021-09-10

申请号：PCT/EP2021/053442

申请日：2021-02-12

Applicant: DANFOSS A/S

Inventor： KRISTENSEN, Søren Sottrup

IPC: F16K1/38 ,  F16K1/42 ,  F25B41/35

Abstract: Expansion valve, in particular for a heating and/or cooling application, comprising a movable plug (1) and a valve seat, wherein the distance between the plug and the valve seat defines a valve opening. The valve comprises a seat portion (3) extending over a first axial distance of the a fluid conduit of the valve, a step portion (4) in which the cross section of the fluid conduit increases significantly over a short second axial distance and further comprises a sloped portion (5) in which the cross section increases gradually over a longer third axial distance than the step portion, wherein the first axial distance is smaller than the third axial distance. The variable valve opening defines and limits a fluid flow rate through the valve, thereby ensuring a desired pressure drop across the expansion valve.

公开(公告)号：WO2021167613A1

公开(公告)日：2021-08-26

申请号：PCT/US2020/019043

申请日：2020-02-20

Applicant: DANFOSS A/S

Inventor： GONZALEZ, Delvis Anibal ,  SUN, Lin Xiang

IPC: F16C32/04 ,  B23P15/00 ,  F01D3/00 ,  F25B31/00 ,  F25B31/02

Abstract: This disclosure relates to an axial magnetic bearing for a centrifugal refrigerant compressor, and a corresponding system and method. A centrifugal refrigerant compressor system according to an exemplary aspect of the present disclosure includes, among other things, an impeller connected to a shaft, and a magnetic bearing system supporting the shaft. The magnetic bearing system includes an axial magnetic bearing, which itself includes a first permanent magnet configured to generate a first bias flux, a second permanent magnet axially spaced-apart from the first permanent magnet and configured to generate a second bias flux, and an electromagnet. The electromagnet includes a coil arranged radially outward of the first and second permanent magnets, and the electromagnet is configured to selectively generate either a first control flux or a second control flux to apply a force to the shaft in a first axial direction or second axial direction opposite the first axial direction, respectively.

公开(公告)号：WO2021122664A1

公开(公告)日：2021-06-24

申请号：PCT/EP2020/086313

申请日：2020-12-15

Applicant: DANFOSS A/S

Inventor： PETERSEN, Hans Kurt ,  JENSEN, Leo Finn ,  PEDERSEN, Anders ,  MATZEN, Detlet ,  PAPADIMITRIOU, Alexandra

IPC: F25B41/31 ,  F25B41/35 ,  F25B2341/06

Abstract: An expansion valve (1) is described comprising a housing (2) having in inlet port (3) and an outlet port (4), a valve seat (5) arranged between the inlet port (3) and the outlet port (4), a valve element (6) movable over an operating stroke between a closed position at the valve seat (5) and an opened position away from the valve seat (5), and an actuator (7), wherein the actuator (7) comprises an electric rotary motor (8) acting on the valve element (5) by means of a threaded spindle (10) and a nut (9), wherein one of spindle (10) and nut (9) is rotatably driven by the motor (8) and the other one is rotatably fixed. Such an expansion valve should have the possibility for a simple assembly. To this end, in a disassembled condition of housing (2) and actuator (7) the actuator (7) has a mounting stroke which is at least two times the operating stroke, wherein the mounting stoke extends the operating stroke.

公开(公告)号：WO2021096905A1

公开(公告)日：2021-05-20

申请号：PCT/US2020/059929

申请日：2020-11-11

Applicant: DANFOSS A/S

Inventor： PEREZ, Alonso ,  LI, Tianlei ,  YAN, Jin

IPC: F04D1/00 ,  F04D3/00 ,  F04D17/00 ,  F25B1/10 ,  F25B1/053 ,  F04D17/10 ,  F04D27/02

Abstract: A compressor according to an exemplary aspect of the present disclosure includes, among other things, a mixed compression stage having both axial and radial components arranged along a main flow path, and a radial compression stage having an impeller with a plurality of vanes arranged in the main flow path downstream of the mixed compression stage. The impeller is configured to rotate about an axis and has an outlet downstream of the vanes. A movable diffuser is arranged at the outlet, and the movable diffuser is configured to vary an area of the outlet.

公开(公告)号：WO2021071819A1

公开(公告)日：2021-04-15

申请号：PCT/US2020/054369

申请日：2020-10-06

Applicant: DANFOSS A/S

Inventor： SCHAEFER, Arnold Martin ,  YAN, Jin ,  PEREZ, Alonso Misael

IPC: F04D17/00 ,  F25B1/00 ,  F25B1/04 ,  F25B1/10 ,  F25B35/04 ,  F25B41/00 ,  F25B41/04

Abstract: This disclosure relates to a compressor having at least two compression stages. In particular, an exemplary compressor includes a first radial compression stage arranged along an axis, a second radial compression stage arranged along the axis, and a connector fluidly connecting an outlet of the first radial compression stage to an inlet of the second radial compression stage. The connector has a plurality of sections arranged about the axis. The compressor may be a refrigerant compressor used in a heating, ventilation, and air conditioning (HVAC) chiller system.

公开(公告)号：WO2021058193A1

公开(公告)日：2021-04-01

申请号：PCT/EP2020/072723

申请日：2020-08-13

Applicant: DANFOSS A/S

Inventor： PRINS, Jan ,  FINN SLOTH LARSEN, Lars

IPC: F25B1/10 ,  F25B49/02 ,  F25B5/02 ,  F25B41/00 ,  F25B1/00

Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) comprises an ejector (4), and has a non-return valve (11) arranged in the refrigerant path between an outlet (12) of an evaporator (7) and an inlet (10) of a compressor unit (2), in such a manner that a refrigerant flow from the outlet (12) of the evaporator (7) towards the inlet (10) of the compressor unit (2) is allowed, while a fluid flow from the inlet (10) of the compressor unit (2) towards the outlet (12) of the evaporator (7) is prevented. A pressure, P0, of refrigerant leaving the evaporator (7) is measured and a value being representative for a pressure, Psuc, of refrigerant entering the compressor unit (2) is obtained. The pressures, P0 and Psuc, are compared to respective reference pressure values, P0,ref and Psuc,ref. In the case that ε0>εsuc, where ε0=P0-P0,ref and εsuc=Psuc-Psuc,ref, the compressor unit (2) is controlled based on P0, and in the case that εsuc>ε0, the compressor unit (2) is controlled based on Psuc.