(19)
(11) EP 0 745 774 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
04.06.1997 Bulletin 1997/23

(43) Date of publication A2:
04.12.1996 Bulletin 1996/49

(21) Application number: 96108447.2

(22) Date of filing: 28.05.1996
(51) International Patent Classification (IPC)6: F04C 15/04, F04C 2/10
(84) Designated Contracting States:
DE ES FR GB

(30) Priority: 30.05.1995 IT TO950441

(71) Applicant: MAGNETI MARELLI S.p.A.
20145 Milano (IT)

(72) Inventor:
  • Pachetti, Carlo
    56100 Pisa (IT)

(74) Representative: Jorio, Paolo et al
Studio Torta, Via Viotti, 9
10121 Torino
10121 Torino (IT)

   


(54) Variable-delivery pump


(57) A variable-delivery pump (1) has a first compression stage (18) and at least one second compression stage (23) with respective inlet passages (21) (28) communicating with an inlet (6) of the pump (1), in use, and respective exhaust openings (22) (29) for communicating with a delivery outlet (7) of the pump (1) itself; the pump (1) further being provided with a valved selector unit (30) interposed between the inlet passages (21) (28) and the exhaust passages (22) (29) which can be actuated to connect the passages (21) (22) (28) (29) together and to select different operative conditions for the stages (18) (23) according to the pressure of the fluid directed to the delivery outlet (7).






Search report