Scroll compressor with reverse rotation prevention

(19)

(11)

EP 1 041 286 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	24.10.2001 Bulletin 2001/43

(43)	Date of publication A2:
	04.10.2000 Bulletin 2000/40

(21)	Application number: 00200684.9

(22)	Date of filing: 28.02.2000

(51)	International Patent Classification (IPC)⁷: F04C 18/02, F04C 29/10

(84)	Designated Contracting States:
	AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

(30)

Priority:

30.03.1999 US 280495

(71)	Applicant: CARRIER CORPORATION
	Syracuse New York 13221 (US)

(72)	Inventors:
	Blessing, Dennis J. Greenwood, Indiana 46143 (US) Das, Sathish R. Indianapolis, Indiana 46278 (US) Burkhart, Larry J. Indianapolis, Indiana 46214 (US) Schnell, Timothy J. Clayton, Indiana 46118 (US)

(74)	Representative: Schmitz, Jean-Marie et al
	Dennemeyer & Associates S.A., P.O. Box 1502 1015 Luxembourg 1015 Luxembourg (LU)

(54)	Scroll compressor with reverse rotation prevention

(57) A scroll type compressor is employed in a heat pump system having a solenoid actuated four way flow reversing valve. A processor monitors a system parameter that is indicative that a flow reversal has taken place or is about to take place, at which time the compressor motor is shut down for a predetermined period of time during which the compressor produces objectionable noise produced by separation of the scroll element due to a low pressure differential over the compressor. At the end of the period, the compressor motor is reenergized. The processor is arranged to cycle the compressor at the beginning and end of each defrost cycle or when the system undergoes a change in its operational mode.

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