| 摘要 |
<p>The amplifier includes a housing (2, 3) containing a chamber (4) provided with a delivery outlet (8) containing a non-return delivery valve (10). An inlet pipe (7) projects into and terminates within the chamber (4) and a resilient D-section obturator ring (13) is engaged with and located about the pipe to be resiliently- movable in the chamber. An annular exhaust aperture (12) surrounding the pipe can be sealed by the obturator ring (13), the obturator ring being responsive to fluid flow in the inlet pipe (7) such that fluid flow causes the obturator ring to oscillate between conditions which alternately permit and prevent fluid from leaving the chamber through the exhaust aperture (12) thereby causing a pulsed pressure increase in the fluid flowing through the delivery outlet. An adjuster (23) is provided for adjusting the distance by which the fluid inlet pipe (7) projects into the chamber and thus vary the distance between the obturator ring (13) and the annular exhaust aperture (12). The adjuster (23) is rotatably engaged with the pipe (7) and with the housing and moves the pipe using co-operably inclined faces. The obturator ring (13) and the exhaust aperture (12) are preferably shaped to create a venturi effect as fluid flows past them.</p> |
