Pneumatic actuator

Details Pneumatic actuator Pneumatic actuator

1991-04-10

1992-05-12

Chambers, A. Michael

Fluid handling

Flow affected by fluid contact, energy field or coanda effect

Means to regulate or vary operation of device

137842, F15C 104

Patent

active

051118475

ABSTRACT:
A pneumatic actuator comprises a cell through which a normally laminar flow of air passes between an inlet and an outlet to provide, in the outlet, an output pressure. The cell includes an electro-acoustic transducer, for example a piezo-electric element arranged, in response to an oscillating electrical signal, to produce an acoustic signal that disturbs the laminar flow whereby at least some of the air exhausts from the cell via one or more exhaust ports and the output pressure falls. The difference in the output pressures may be used to control a pneumatic device optionally via a pneumatic amplifier. The electrical signal is produced by an opto-electrical transducer to which optical control signals are transmitted, for example along a fibre optic cable.

REFERENCES:
patent: 3428068 (1969-02-01), Howie, Jr.
patent: 3534754 (1970-10-01), Beeken
patent: 3566896 (1971-03-01), Proniewicz
patent: 3591809 (1971-07-01), Lankaniemi
patent: 4512371 (1985-04-01), Drzewiecki et al.
patent: 4590970 (1986-05-01), Mott
patent: 4689827 (1987-08-01), Gurney, Jr.
Nomoto/Shimada-Ultrasonically Modulated Fluid-State Transducer-Faculty os Science and Engineering Sep. 1968.

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