SERVO INJECTOR

A piezoelectric control valve (30) for a servo injector (10) has a piezoelectric actuator (32) which comprises an encapsulating tube (54) extending along a main axis (X) from a first extremity (56) to a second extremity closed by a closing member (58) and, a piezoelectric stack (76) axially compress...

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Bibliographic Details
Main Authors GUIGNON, Gael, VIT, Romain, TAPIN, Christophe, COOKE, Michael, TORRESANI, Alexandre
Format Patent
LanguageEnglish
French
German
Published 06.12.2017
Subjects
BASIC ELECTRIC ELEMENTS
BLASTING
COMBUSTION ENGINES
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MECHANICAL ENGINEERING
SEMICONDUCTOR DEVICES
SUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLEMIXTURES OR CONSTITUENTS THEREOF
WEAPONS
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Summary:A piezoelectric control valve (30) for a servo injector (10) has a piezoelectric actuator (32) which comprises an encapsulating tube (54) extending along a main axis (X) from a first extremity (56) to a second extremity closed by a closing member (58) and, a piezoelectric stack (76) axially compressed inside the encapsulating tube (54) between an upper extremity in contact with the inner face (60) of the closing member (58) and, a lower extremity in contact with a pusher member (78) adapted to cooperate with a valve member (36) in order to open or close a return orifice. The piezoelectric control valve (30) further comprises an adjusting member (64) adapted, in use, to permanently maintain a compression force (Fl) in the encapsulating tube (54) independently of the energizing state of the piezoelectric stack (76) and of the thermal expansion of the injector (10).
Bibliography:Application Number: EP20160700295