EP 0378933 A3 19900822 - METHOD OF USING A THERMAL EXPANSION VALVE DEVICE, EVAPORATOR AND FLOW CONTROL MEANS ASSEMBLY, AND REFRIGERATING MACHINE
Title (en)
METHOD OF USING A THERMAL EXPANSION VALVE DEVICE, EVAPORATOR AND FLOW CONTROL MEANS ASSEMBLY, AND REFRIGERATING MACHINE
Publication
Application
Priority
FR 8816207 A 19881209
Abstract (en)
[origin: EP0378933A2] The expansion valve 103 of the refrigerating machine is controlled by the difference between the pressure in a bulb 104 containing a fixed amount of fluid and the pressure in the evaporator 2. The bulb is mounted in the discharge pipe 1 of the evaporator and is heated by a resistor. In the absence of droplets of liquid refrigerant in the flow through the discharge pipe, i.e. when the refrigerant flow rate tends to become too low with respect to the cold demand, the resistor heats up the fluid in the bulb, the pressure in the bulb increases and moves the expansion valve to a more opened position. As soon as droplets hit the bulb in the discharge pipe, said droplets cool down the bulb despite the heating effect of the resistor and the expansion valve is moved to a more closed position. Thus, the flow rate control uses variations in heat transfer coefficients in the discharge pipe rather than superheat temperature in the discharge pipe. The evaporator may be small-sized because it does not have to produce superheat.
IPC 1-7
IPC 8 full level
F25B 41/06 (2006.01); F25B 49/02 (2006.01)
CPC (source: EP US)
F25B 41/335 (2021.01 - EP US); F25B 2341/0681 (2013.01 - EP); F25B 2500/15 (2013.01 - EP); F25B 2600/21 (2013.01 - EP)
Citation (search report)
- [YD] US 4467613 A 19840828 - BEHR JOSEPH L [US], et al
- [Y] US 2534455 A 19501219 - KOONTZ LAMONT B
- [A] FR 2514114 A1 19830408 - DANFOSS AS [DK]
- [A] US 2624181 A 19530106 - ROY ERWIN LEE, et al
- [A] US 2240374 A 19410429 - NEWTON ALWIN B
- [A] US 2209101 A 19400723 - NEWTON ALWIN B
- [A] GB 939659 A 19631016 - ATLAS AS
- [A] US 2367304 A 19450116 - NEWTON ALWIN B
- [A] FR 1178599 A 19590512 - SULZER AG
- [A] WO 8204142 A1 19821125 - ALSENZ RICHARD H
- [A] US 1969102 A 19340807 - FRANCIS SHENTON, et al
- [A] GB 1427926 A 19760310 - AXSTANE PROPERTIES LTD
- [A] US 2583178 A 19520122 - HUNTINGTON WILLIAM L
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0378933 A2 19900725; EP 0378933 A3 19900822; JP H02263071 A 19901025
DOCDB simple family (application)
EP 89403410 A 19891208; JP 31789689 A 19891208