| 摘要 |
<p>A hydraulic fuse monitors the quantity of fluid passing through it and blocks such flow when a selected quantity has passed, the fuse including a body structure (13) containing a cavity (14), a primary piston (22) in the cavity movable endwise to control fluid flow through a first port (23); a sleeve (17) and a slider (18) in the cavity (14) and in the path of fluid flow to the primary piston (22); a regulator spring (19) to urge the sleeve (17) in one axial direction; and fluid flow control slots (33 to 36) formed by the sleeve (17) and slider (18) to control flow both to the piston (22) and to the first port (23); characterised in that the piston (22) begins its movement toward the port (23) as the flow rate through the fuse reaches a threshold, and beyond that threshold, relative axial movement between the sleeve (17) and slider (18) acts to maintain nearly constant the fluid pressure drop across primary slot means of the control slots and controllably meters fluid flow to the piston (22) via metering slot means of the control slots.</p> |
