| 摘要 |
A head for sensing fluid flow pressure of the kind comprising a swivelling pitot tube wherein the pitot tube is mounted on a hinge joint through which fluid pressure at the pitot tube and the angular position of the pitot tube are transmitted without the use of dynamic seals. The fluid pressure is transmitted via a passageway extending by way of the hollow pivot pin on one member of the hinge joint to which the pitot tube is fixed, a hollow shaft in the other hinge joint member and a flexible tubular connection between the pivot pin and shaft, the shaft being coupled to the pivot pin so as to rotate therewith and reduce relative rotation between the ends of the flexible connection. The angular position of the shaft indicates the angular position of the pitot tube. The head finds especial application in helicopter airspeed measuring apparatus.
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