Speed limiting turbine with momentum activated bypass valve

摘要

A speed limiting mechanism for a turbine-driven fluid distribution apparatus usable with compressible fluid such as compressed air and incompressible fluid such as water. In one form, a flow restrictor is located in the turbine discharge flow path, with the turbine discharge port area selected in relation to the turbine inlet port area according to the desired turbine speed with compressed air. In another form, the incoming fluid flows downstream along the surface of the turbine stator, and is then diverted to enter the rotor chamber in the proper direction. A bleed area on the stator which permits a portion of a compressible fluid which has expanded as it flows along the stator surface to flow to bypass the turbine rotor. In another embodiment, a valve may be provided upstream from the turbine to selectively divert at least a portion of the pressurized fluid around the turbine when the pressurized fluid air or a combination of air and water.

主权项

1. A sprinkler, comprising:
a riser for receiving a pressurized fluid; a nozzle; a mounting device configured to mount the nozzle at an upper end of the riser for rotation about an axis; a turbine mounted for rotation inside the riser and in fluid communication with the pressurized fluid; a drive device connected between the turbine and the nozzle such that rotation of the turbine by the pressurized fluid will rotate the nozzle; a first valve positioned upstream from the turbine and configured to selectively re-direct at least a portion of the pressurized fluid around the turbine when the pressurized fluid is air or a mixture of water and air the first valve including:
a valve seat positioned adjacent to the inlet of the turbine chamber;a central opening formed in the valve seat in fluid communication with an area upstream of the turbine chamber;a valve member movably mounted in the first valve and configured to move from a closed position in which it directs the pressurized fluid to bypass the turbine chamber and an open position in which it directs the pressurized fluid into the turbine chamber; and a second valve positioned upstream from the first valve and configured to maintain a desired pressure differential across the turbine.