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公开(公告)号：US11434918B2
公开(公告)日：2022-09-06
申请号：US16448422
申请日：2019-06-21
Applicant: Danfoss A/S
Inventor： Zili Sun , Ruiguo Gao , Stefan Walshe , Aida Rezaei , Dongkoo Shin
IPC: F04D29/043 , F04D29/048 , F25B31/02
Abstract: This disclosure relates to a compressor having a partially hollow shaft. In particular, an exemplary compressor includes a shaft which is partially hollow, and at least one impeller rotatably coupled to the shaft. The compressor may be a refrigerant compressor used in a heating, ventilation, and air conditioning (HVAC) chiller system.
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公开(公告)号：US20220221207A1
公开(公告)日：2022-07-14
申请号：US17609876
申请日：2020-08-13
Applicant: Danfoss A/S
Inventor： Jan Prins , Lars Finn Sloth Larsen
Abstract: A method for controlling a vapour compression system (1) is disclosed. The vapour compression system (1) includes 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.
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公开(公告)号：US11340000B2
公开(公告)日：2022-05-24
申请号：US16461937
申请日：2017-11-15
Applicant: Danfoss A/S
Inventor： Frede Schmidt , Jan Prins , Kristian Fredslund , Kenneth Bank Madsen
Abstract: A method for controlling a vapour compression system (1) is disclosed. A mass flow of refrigerant along a part of the refrigerant path is estimated, based on measurements performed by one or more pressure sensors (10, 12, 13) for measuring a refrigerant pressure at selected positions along the refrigerant path and one or more temperature sensors (11, 14) for measuring a refrigerant temperature at selected positions along the refrigerant path. A refrigerant pressure or a refrigerant temperature at a selected position a pressure sensor (10, 12, 13) or temperature sensor (11, 14) along the refrigerant path is derived, based on the estimated mass flow. The vapour compression system (1) is allowed to continue operating, even if a sensor (10, 11, 12, 13, 14) is malfunctioning or unreliable.
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公开(公告)号：US11333449B2
公开(公告)日：2022-05-17
申请号：US16599329
申请日：2019-10-11
Applicant: Danfoss A/S
Inventor： Benny Andersen
Abstract: A heat transfer plate and/or a plate heat exchanger including the heat transfer plate includes a plate body forming a patterned section and having a first side and a second side opposite to the first side; a gasket groove formed depressed from the plate body in a direction from the first side towards the second side, and having a bottom wall, the bottom wall having a bottom wall body; and where the gasket groove includes at least a first section with a first recess formed on the bottom wall body, depressed from the bottom wall body in the direction from the first side towards the second side, and a second section with a second recess formed on the bottom wall body, depressed from the bottom wall body in the direction from the second side towards the first side, wherein the second section is adapted to accommodate a gasket.
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公开(公告)号：US20220099381A1
公开(公告)日：2022-03-31
申请号：US17418065
申请日：2019-12-03
Applicant: Danfoss A/S
Inventor： Pierre Olivier Pelletier , Zhifeng Zhang , Wenjian Wei
Abstract: Disclosed is a multi-loop plate heat exchanger, including: a plurality of heat exchange plates arranged in a stacked manner; heat exchange channels formed between adjacent heat exchange plates in the plurality of heat exchange plates; and port channels extending through the heat exchange plates and respectively used for inflow and outflow of a heat exchange medium, at least one of the port channels including at least two fluid channels which are separated from each other and used for inflow or outflow of at least two of multiple loops of refrigerant. The at least two fluid channels share one of the port channels, and the at least two fluid channels are arranged side by side in the radial direction of the port channel.
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Patent Agency Ranking
公开(公告)号：US20220065359A1
公开(公告)日：2022-03-03
申请号：US17415430
申请日：2019-11-07
Applicant: Danfoss A/S
Inventor： Charlotte Vibeke Pingel Vagnsholdt , Sigurd Larsen
Abstract: Valve (1), in particular expansion valve, is described including a valve element driven by an actuator and being arranged in a valve housing arrangement (4, 5, 15), wherein the valve housing arrangement (4, 5, 15) includes a housing (4), a tube (15) connected to the housing (4) and at least one connector (5) extending from the housing (4), wherein the actuator comprises a rotary motor having a stator and a rotor, the rotor being arranged inside the tube (15) and the stator being arranged outside the tube (15). A simple way is needed to position the stator and the rotor relative to each other. To this end the stator is fixed to a stator holder (16) which is arranged around the tube (15) and connected to the housing arrangement (4, 5, 15).
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公开(公告)号：US20220026127A1
公开(公告)日：2022-01-27
申请号：US17297596
申请日：2019-11-25
Applicant: Danfoss A/S
Inventor： Niels P. Vestergaard , Johan Van Beek
Abstract: The invention relates to a cooling system and operating method therefor with a direct expansion cooling circuit for an ammonia refrigerant. A compressor 12 is provided to compress ammonia vapor 11. A condenser is provided to condense the ammonia vapor to obtain liquid ammonia 20. An evaporator 32 is provided to evaporate the liquid ammonia. A superheat vapor quality sensor 40 is arranged at a conduit 34 between at least a portion of the evaporator 32 and the compressor 12. The superheat vapor quality sensor 40 comprises a heating element 48 and a temperature sensing element 52. The superheat vapor quality sensor 40 is disposed to deliver a sensor signal S indicative of a superheat vapor quality X of refrigerant flowing through the conduit 34 from an output of the temperature sensing element 52. The superheat vapor quality sensor 40 is arranged on a wall of a horizontally arranged portion of the conduit 34 in a position forming an angle of more than 120° to a vertical upward direction.
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公开(公告)号：US20220003473A1
公开(公告)日：2022-01-06
申请号：US17479014
申请日：2021-09-20
Applicant: Danfoss A/S
Inventor： Lars Finn Sloth Larsen , Jan Prins , Kenneth Bank Madsen
Abstract: A method for controlling ejector capacity in a vapour compression system (1) is disclosed. A parameter value being representative for a flow rate of liquid refrigerant from the evaporator(s) (8, 10) and into a return pipe (12, 13) is obtained, and the capacity of the ejector(s) (6) is adjusted based on the obtained parameter value. Ejector capacity may be shifted between low pressure ejectors (liquid ejectors) (6a, 6b, 6c, 6d) and high pressure ejectors (gas ejectors) (6e, 6f).
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公开(公告)号：US11204187B2
公开(公告)日：2021-12-21
申请号：US16034457
申请日：2018-07-13
Applicant: Danfoss A/S
Inventor： Frank D. Ford
Abstract: A chiller system according to an exemplary aspect of the present disclosure includes a compressor section and a controller. The compressor section has a first refrigerant compressor having a first cooling capacity and a second refrigerant compressor having a second cooling capacity different from the first cooling capacity. The controller is configured to selectively operate the first and second refrigerant compressors.
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