Danfoss Scroll Technologies, LLC

Danfoss A/s

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Joe T Hill

Tracy Lanier Milliff

Gene Michael Fields

Tapesh P Patel

Harshal Upadhye

Klaus Halldorsson

Simon Ahrens Lassen

Ole Holst Christensen

Detlef Matzen

Ole Horst Christensen

The invention relates to a pilot valve arrangement () comprising a pilot valve device () which comprises a pilot valve element (), a pilot valve seat () cooperating with the pilot valve element () and a presetting mechanism for presetting an opening pressure of the pilot valve element (), the pilot valve arrangement () further comprising a presetting mechanism actuating device () which comprises an actuator element () adapted to create an actuating force in order to actuate the presetting mechanism in the pilot valve device so as to preset the opening pressure. According to the invention, the pilot valve arrangement () comprises a contactless force coupling arrangement adapted to transfer the actuating force from the presetting mechanism actuating device () to the pilot valve device (). An inventive pilot valve device () is disclosed and claimed as well. The invention allows to improve maintenance and safety concerning the devices mentioned above.

Pilot valve arrangement

At least one bypass opening is formed in a base of a scroll member, and communicates with at least one compression chamber. The bypass opening communicates with a passage leading to a suction pressure chamber within a compressor shell. A valve includes an element electrically powered to move between a first position at which it blocks flow of refrigerant from the bypass port to the passage leading to the suction pressure chamber, and a second position at which it allows flow of refrigerant between the bypass port and the passage leading to the suction pressure chamber. A portion of the valve, which is electrically powered, is mounted outside of the compressor shell.

Scroll compressor capacity modulation with solenoid mounted outside a compressor shell

A scroll compressor includes a compressor shell having first and second scroll members. The scroll members each have a base and a generally spiral wrap extending from its base. The generally spiral wraps of the first and second scroll members interfit to define compression chambers. A shaft causes the second scroll member to orbit relative to the first scroll member. At least one bypass port is formed in a base of one scroll member, and communicates with at least one of the compression chambers. The bypass port communicates with a passage leading to a suction pressure chamber within the compressor shell. A solenoid valve is movable between a reduced capacity position and a full capacity position, and selectively supplies a pressurized fluid to a fluid valve associated with the bypass port, such that movement of the solenoid can control whether the bypass port is open or closed.

Scroll compressor capacity modulation with hybrid solenoid and fluid control

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Kolding, Denmark

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