Fluid sprinkling – spraying – and diffusing – Distributor continuously moves relative to support during... – Including deflector
Patent
1997-01-29
1998-05-12
Weldon, Kevin
Fluid sprinkling, spraying, and diffusing
Distributor continuously moves relative to support during...
Including deflector
B05B 314
Patent
active
057495238
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to jet actuator particularly for actuating rotary pulse sprinklers.
The device according to the invention can also be advantageously applied to the actuation of other hydraulic devices, such as for example valves, gate valves, systems for signalling and/or controlling the level of water basins or streams, located in regions that are not connected to electric lines, in developing countries or in countries that have limited energy resources.
It is known that rotary pulse sprinklers are generally constituted by a tubular body or spout which has, at one end, a joint for connection to a line for feeding pressurized water, and has, at the opposite end, a nozzle for producing a continuous jet that has a preset diameter and range. The joint is of the rotary type, with an approximately vertical rotation axis, and is anchored to a structure or to a trailer which rests on the ground or is rigidly coupled thereto.
In order to allow uniform water distribution over a circular region, through an adapted actuator the spout is rotated stepwise by using the energy of the jet that leaves the spout.
Conventional jet actuators essentially comprise a deflector means which is preset to draw part of the energy of the jet by interfering periodically with it. Generally, the deflection means is arranged at a certain distance from the nozzle and is mounted at the end of an arm which is mounted on the spout or on a connecting elbow, so that it can oscillate. The energy drawn by the deflector means is converted into a rotation torque which is applied to the spout so as to oppose the contrast action of a braking means which is associated with the rotating joint.
The deflector means has the additional function of breaking and periodically interrupting the jet, so as to obtain optimum radial distribution of the water.
Examples of pulse sprinklers with jet actuators are described in U.S. Pat. No. 3,744,720 and No. 4,231,522, in French patent no. 2,653,357, in German patent no. 1,151,145, in Swiss patent no. 593,652, and in European patent no. 97 985.
A first drawback of these known actuators is their limited flexibility in use, since for a given deflector size and shape the optimum utilization range is relatively narrow with respect to variations in nozzle diameter and in operating pressures.
Known actuators in fact are generally preset to operate in an optimum manner with small-diameter jets and low operating pressures, or with large-diameter jets and high operating pressures.
Actuators suitable to operate with high pressures and large diameters are highly efficient in terms of fluid dynamics and generate pulse forces that are so intense as to require a proportional braking means both for the arm and for the joint.
Another drawback is the considerable complexity of known actuation devices, especially as regards the geometry of the deflection means.
Another drawback resides in the fact that the deflection means must be located in a specific and precise starting or idle position in order to start operating, otherwise the device does not start to operate.
OBJECTS OF THE INVENTION
From DE-A-2803644 is known a part-circle sprinkler head of the quick return type having all the features mentioned in the preamble of the enclosed claim 1, with a first deflector means mounted on an impulse arm and disposed within the path of the stream to impart an incremental stepwise rotation to the sprinkler body. The sprinkler has a second deflector means with a coanda-effect surface operable only when it is desired to effect the quick return rotation of the sprinkler head to its initial angular position. This arrangement may be dangerous for the personnel involved during the quick return rotation of the head and cannot ensure a reliable startup of the stepwise rotation.
The aim of the invention is to eliminate the drawbacks described above by providing a jet actuator that can be applied to rotating sprinklers and to other hydraulic devices and can operate in an optimum manner within a wide range of
REFERENCES:
patent: 3580507 (1971-05-01), Beamer
patent: 3744720 (1973-07-01), Meyer
patent: 4109866 (1978-08-01), Brandl
patent: 4669663 (1987-06-01), Meyer
patent: 4858829 (1989-08-01), Drechsel
Coleman Henry D.
Sudol R. Neil
Weldon Kevin
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