公开(公告)号：US20180306474A1

公开(公告)日：2018-10-25

申请号：US15765771

申请日：2016-09-30

Applicant: Danfoss A/S

Inventor： Sergio Uribe ,  Johannes Cornelius Jacobus Van Beek

IPC: F25B41/06 ,  F16K31/00 ,  F16K31/02

CPC classification number: F25B41/062 ,  F16K31/002 ,  F16K31/025 ,  F25B2341/0651 ,  Y02B30/72

Abstract: An expansion valve (2) for a vapour compression system (1) and a vapour compression system (1) are disclosed. The expansion valve (1) comprises a valve element (9), a valve seat (13) as well as a biasing member (12). The valve element (9) and the valve seat (13) are arranged in a first fluid passage (6) of the expansion valve (2). The expansion valve (2) further comprises a shape memory alloy actuator (17) that exerts a force on the valve element towards an open valve position when the shape memory alloy actuator is heated by an electric current. The object of the invention is to provide an expansion valve for a vapour compression system of the above type that maybe controlled externally but is also self-regulating. To this end the shape memory alloy actuator (17) is arranged in a second fluid passage (7) of the expansion valve (2), wherein the shape memory alloy actuator (17) is arranged to be in thermal contact with the fluid in the second fluid passage (7), such that the shape memory alloy actuator also actuates the valve element (9) towards a closed valve position when the shape memory actuator (17) is cooled by the fluid in the second fluid passage (7).

公开(公告)号：US20180216749A1

公开(公告)日：2018-08-02

申请号：US15747231

申请日：2016-07-25

Applicant: Danfoss A/S

Inventor： Anders Pedersen ,  Leo Finn Jensen

IPC: F16K31/40

Abstract: The invention relates to a valve (1) comprising a main valve (2), a pilot valve (3), a housing (4), an inlet (5) and an outlet (8). Opening and closing of the main valve (2) is controlled by the pilot valve (3). A pilot valve seat (10) is arranged in a diaphragm (6). A pilot chamber (11) is arranged in the housing (4) separated from the inlet (5) and the outlet (8) by the diaphragm (6). Task of the invention is to provide a valve with a lower cost. According to the invention a support member (17) supports the diaphragm (6), wherein the support member (17) is guided in the housing, and wherein a radial gap (26) is arranged between the radially outer end of the diaphragm (6) and the housing (4) in a radial direction perpendicular to the opening direction of the pilot valve (3). Thereby, a cheaper, less resistant material for the diaphragm can be used.

公开(公告)号：US20180128394A1

公开(公告)日：2018-05-10

申请号：US15569868

申请日：2016-03-01

Applicant: Danfoss A/S

Inventor： Aravind Vijayan ,  Raghavendra Venkatesh ,  John Arul Mike Prakash ,  Detlef Matzen

IPC: F16K31/124 ,  F16K31/42 ,  F16K31/40

CPC classification number: F16K31/1245 ,  F16K31/406 ,  F16K31/42

Abstract: The present invention relates to a top cover (3) for a soft throttling valve body (2), to a soft throttling valve (1), and to a method for throttling a main valve of a soft throttling valve (1). A follower arrangement (8) is arranged to throttle a pilot fluid flow for setting a degree of opening of the main valve in order to allow a soft throttling of the main valve, a throttling of the pilot fluid flow depending on a degree of opening of the main valve, so as to allow for a soft throttling process of the main valve. Thus, a self-controlled throttling of pilot fluid flow driving the main valve in order to establish a partial opening of the main valve becomes possible. By that, a good prevention of pressure shocks when throttling the valve is allowed and a good control for partially opening the main valve is achieved.

公开(公告)号：US09945231B2

公开(公告)日：2018-04-17

申请号：US14930720

申请日：2015-11-03

Applicant: Danfoss A/S

Inventor： Erik Haugaard ,  Hans Christian Petersen

IPC: F01C1/344 ,  F04C2/344 ,  F04C14/06 ,  F01C21/08 ,  F01C21/10 ,  F04C18/344

CPC classification number: F01C21/0809 ,  F01C1/3448 ,  F01C21/0836 ,  F01C21/106 ,  F04C2/3446 ,  F04C2/3448 ,  F04C18/3448

Abstract: The invention specifies a hydraulic vane-type machine (1) having a stator (2) and having a rotor (3) which has multiple vanes (4), each of which vanes is radially displaceable in a guide (5) in the rotor (3), bears against an inner circumference (6) of the stator (2), and, together with the rotor (3), the stator (2) and in each case one side wall (7) at each axial end of the rotor (3), delimits working chambers whose volumes vary in the event of a rotation of the rotor (3) relative to the stator (2). It is sought to obtain a certain degree of freedom for the design of the inner circumference. For this purpose, it is provided that each vane (4) has, on its radially inner side, an abutment surface (17) which bears radially at the outside against a cam disk (15).

公开(公告)号：US09926930B2

公开(公告)日：2018-03-27

申请号：US15017759

申请日：2016-02-08

Applicant: Danfoss A/S

Inventor： Erik Haugaard

IPC: F04C15/06 ,  F04C2/34 ,  F04C2/344

CPC classification number: F04C15/06 ,  F04C2/3441 ,  F04C2/3448 ,  F04C2250/101 ,  F04C2250/102

Abstract: A vane pump (1) is disclosed comprising a housing (2) having a stator bore, a rotor (4) being rotatably mounted within said stator bore, and having a number of vanes (5) slidably mounted in said rotor (4) in radial direction of said rotor (4), an inlet (11) and an outlet (12). Such a vane pump should have a good efficiency. To this end said inlet (11) opens in an axial end wall of said stator bore (3) and said outlet (12) is connected to an outflow area formed in a circumferential wall (3) of said stator bore.

公开(公告)号：USD813351S1

公开(公告)日：2018-03-20

申请号：US29570297

申请日：2016-07-07

Applicant: DANFOSS A/S

Designer： Kurt Harck ,  Sigurd Larsen

公开(公告)号：US09885509B2

公开(公告)日：2018-02-06

申请号：US14349749

申请日：2012-10-05

Applicant: Danfoss A/S

Inventor： Kenneth Bank Madsen ,  Frede Schmidt

IPC: F25B1/00 ,  F25B49/00 ,  F25B49/02 ,  F25B39/04

CPC classification number: F25B49/027 ,  F25B39/04 ,  F25B49/005 ,  F25B2309/061 ,  F25B2313/0313 ,  F25B2600/17 ,  F25B2700/195 ,  F25B2700/2102

Abstract: A method for monitoring gas pressure in a heat rejecting heat exchanger in a cooling circuit is disclosed. The present capacity of one or more compressors in the cooling circuit compared to a maximum capacity of the one or more compressors is established. If the present capacity of the one or more compressors is at least at a level corresponding to a pre-set percentage of the maximum capacity, a period of time elapsed from a point in time where the compressor capacity reached said level is established. If the established period of time has a duration which is longer than a pre-set period of time, then it is concluding that the cooling medium is in a gas loop operational mode, allowing an operator or a controller to adjust operation of the cooling plant such that the cooling medium is brought out of the gas loop operational mode.

公开(公告)号：US20170343245A1

公开(公告)日：2017-11-30

申请号：US15531989

申请日：2015-10-08

Applicant: DANFOSS A/S

Inventor： Kristian Fredslund ,  Jan Prins ,  Kenneth Bank Madsen ,  Frede Schmidt

IPC: F25B9/00 ,  F25B49/02 ,  F25B41/00 ,  F25B41/04

CPC classification number: F25B9/008 ,  F25B41/00 ,  F25B41/043 ,  F25B49/02 ,  F25B2309/061 ,  F25B2341/0012 ,  F25B2341/0662 ,  F25B2400/0407 ,  F25B2400/13 ,  F25B2400/23 ,  F25B2500/31 ,  F25B2600/2507 ,  F25B2700/195 ,  F25B2700/2109 ,  F25B2700/21151 ,  F25B2700/21175

Abstract: A method for controlling a valve arrangement (12), e.g. in the form of a three way valve, in a vapour compression system (1) is disclosed, the vapour compression system (1) comprising an ejector (6). The valve arrangement (12) is arranged to supply refrigerant to a compressor unit (2) from the gaseous outlet (11) of a receiver (7) and/or from the outlet of an evaporator (9). The vapour compression system (1) may be operated in a first mode of operation (summer mode) or in a second mode of operation (winter mode). When operated in the second mode of operation, it is determined whether or not conditions for operating the vapour compression system (1) in the first mode of operation are prevailing. If this is the case, the valve arrangement (12) is actively switched to the first mode of operation by closing a first inlet (13) towards the evaporator (7) and fully opening a second inlet (14) towards the receiver (7).

公开(公告)号：US20170328617A1

公开(公告)日：2017-11-16

申请号：US15528206

申请日：2015-10-08

Applicant: DANFOSS A/S

Inventor： Roozbeh Izadi-Zamanabadi

IPC: F25B41/06

CPC classification number: F25B41/062 ,  F25B49/02 ,  F25B2500/19 ,  F25B2500/26 ,  F25B2600/2513 ,  F25B2700/21173 ,  F25B2700/21175

Abstract: A method for controlling a supply of refrigerant to an evaporator (2) of a vapour compression system (1) is disclosed. During a system identification phase an opening degree (12) of the expansion valve (3) is alternatingly increased and decreased, and a maximum temperature difference, (S4−S2)max, between temperature, S4, of air flowing away from the evaporator (2) and temperature, S2, of refrigerant leaving the evaporator (2) is determined. During normal operation, the supply of refrigerant to the evaporator (2) is controlled by calculating a reference temperature, S2,ref, based on the monitored temperature, S4, and the maximum temperature difference, (S4−S2)max, determined during the system identification phase. The supply of refrigerant to the evaporator (2) is controlled in order to obtain a temperature, S2, of refrigerant leaving the evaporator (2) which is substantially equal to the calculated reference temperature, S2,ref.

公开(公告)号：US09791174B2

公开(公告)日：2017-10-17

申请号：US14422380

申请日：2013-07-11

Applicant: Danfoss A/S

Inventor： Roozbeh Izadi-Zamanabadi ,  Hans Joergen Jensen ,  Lars Jensen

IPC: F25B1/00

CPC classification number: F25B1/00 ,  F25B49/02 ,  F25B2345/003 ,  F25B2500/26 ,  F25B2600/05 ,  F25B2600/21 ,  F25B2600/2513 ,  F25B2700/21172 ,  F25B2700/21173 ,  F25B2700/21174 ,  F25B2700/21175

Abstract: A method for controlling a vapor compression system during start-up is disclosed. The rate of change, ΔT1, of the temperature of refrigerant entering the evaporator, and the rate of change, ΔT2, of the temperature of refrigerant leaving the evaporator are compared. Based on the comparing step, a refrigerant filling state of the evaporator is determined. The opening degree of the expansion device is then controlled according to a first control strategy in the case that it is determined that the evaporator is full or almost full, and according to a second control strategy in the case that it is determined that the evaporator is not full. Thereby it is ensured that a maximum filling degree of the evaporator is quickly reached, without risking that liquid refrigerant passes through the evaporator.