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：US10989454B2

公开(公告)日：2021-04-27

申请号：US15765771

申请日：2016-09-30

Applicant: Danfoss A/S

Inventor： Sergio Uribe ,  Johannes Cornelius Jacobus Van Beek

IPC: F16K31/00 ,  F16K31/02 ,  F25B41/31 ,  F25B41/355

Abstract: An expansion valve includes a valve element, a valve seat as well as a biasing member. The valve element and the valve seat are arranged in a first fluid passage of the expansion valve. The expansion valve further includes a shape memory alloy actuator 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. An expansion valve for a vapour compression system of the above type may be controlled externally but also be self-regulating. The shape memory alloy actuator is arranged in a second fluid passage of the expansion valve and the shape memory alloy actuator is in thermal contact with fluid in the second fluid passage, such that the shape memory alloy actuator actuates the valve element towards a closed valve position when the shape memory actuator is cooled by the fluid.