公开(公告)号：US10281181B2

公开(公告)日：2019-05-07

申请号：US14902094

申请日：2014-06-30

Applicant: DANFOSS A/S

Inventor： Bjarke Skovgard Dam ,  Georg Fosel ,  Carsten Molhede Thomsen ,  Louis Sullivan

IPC: F25B41/06 ,  G05D7/01 ,  G05D16/10

Abstract: An expansion valve (1) for a vapour compression system, the valve (1) comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the first valve part (5). A cross-sectional flow area of the outlet orifice (7) between a circumference at an inner surface of the outlet orifice (7) and a circumference at an outer surface of the piston (8) varies as a function of the position of the piston (8) relative to the outlet orifice (7). A first cross-sectional flow area is defined at a first differential pressure, and a second cross-sectional flow area is defined at a second differential pressure, where the first cross-sectional flow area is smaller than the second cross-sectional flow area, and the first differential pressure is lower than the second differential pressure.

公开(公告)号：US10274236B2

公开(公告)日：2019-04-30

申请号：US14902098

申请日：2014-06-30

Applicant: DANFOSS A/S

Inventor： Bjarke Skovgard Dam ,  Georg Fosel ,  Carsten Molhede Thomsen ,  Louis Sullivan

IPC: F25B41/06 ,  G05D7/01

Abstract: An expansion valve (1) for a vapour compression system, the valve comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the first valve part (5), via a forward fluid passage through the first valve part (5). The piston (8) has different cylindrical shapes stepwise along a longitudinal extension of the piston (8), the piston (8) defining a first cross-sectional area along a first longitudinal extension and a second-cross sectional area along a second longitudinal extension, the first cross-sectional area being smaller than the second-cross sectional area. The first longitudinal extension is in the outlet orifice (7) at a first differential pressure and the second longitudinal extension is in the outlet orifice (7) at a second differential pressure, the first differential pressure being lower than the second differential pressure.

公开(公告)号：US10240830B2

公开(公告)日：2019-03-26

申请号：US14902086

申请日：2014-06-30

Applicant: DANFOSS A/S

Inventor： Bjarke Skovgard Dam ,  Georg Fosel ,  Carsten Molhede Thomsen ,  Jens Pawlik ,  Louis Sullivan

IPC: F25B41/06 ,  F16K15/02

Abstract: An expansion valve (1) for a vapor compression system, the valve (1) comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the valve (1). The piston (8) comprises a stop element (9) at an outlet end (8b) of the piston (8) and mechanical forcing means (10) to force the piston (8) towards a position in which the stop element (9) is brought into abutment with a valve seat (12) of the first valve part (5). A differential pressure below a predefined threshold value causes the stop element (9) of the piston (8) to abut the valve seat (12) of the first valve part (5), preventing fluid flow through the first valve part (5), via the forward fluid passage.

公开(公告)号：US20160298889A1

公开(公告)日：2016-10-13

申请号：US14902098

申请日：2014-06-30

Applicant: DANFOSS A/S

Inventor： Bjarke Skovgard DAM ,  Georg Fosel ,  Carsten Molhede THOMSEN ,  Louis SULLIVAN

IPC: F25B41/06 ,  G05D7/01

CPC classification number: F25B41/062 ,  F25B2341/061 ,  F25B2500/01 ,  F25B2500/26 ,  G05D7/0146

Abstract: An expansion valve (1) for a vapour compression system, the valve comprising a first valve part (5) having an outlet orifice (7) and a piston (8) movable inside the outlet orifice (7) in response to a differential pressure across the expansion valve (1), controlling a fluid flow through the first valve part (5), via a forward fluid passage through the first valve part (5). The piston (8) has different cylindrical shapes stepwise along a longitudinal extension of the piston (8), the piston (8) defining a first cross-sectional area along a first longitudinal extension and a second-cross sectional area along a second longitudinal extension, the first cross-sectional area being smaller than the second-cross sectional area. The first longitudinal extension is in the outlet orifice (7) at a first differential pressure and the second longitudinal extension is in the outlet orifice (7) at a second differential pressure, the first differential pressure being lower than the second differential pressure.

Abstract translation: 一种用于蒸气压缩系统的膨胀阀（1），该阀包括具有出口孔（7）的第一阀部分（5）和可在出口孔（7）内部移动的活塞（8） 所述膨胀阀（1）经由所述第一阀部（5）的向前流体通道来控制通过所述第一阀部（5）的流体流。 活塞（8）沿着活塞（8）的纵向延伸部具有不同的圆柱形形状，活塞（8）沿着第一纵向延伸部限定第一横截面积，沿着第二纵向延伸部限定第二横截面积 第一横截面积小于第二横截面面积。 第一纵向延伸部处于第一差压下的出口孔（7）中，第二纵向延伸部处于第二差压下的出口孔（7）中，第一差压低于第二压差。