Fluid sprinkling – spraying – and diffusing – Processes
Patent
1982-02-22
1984-01-03
Love, John J.
Fluid sprinkling, spraying, and diffusing
Processes
239720, B05B 318
Patent
active
044238398
ABSTRACT:
An alignment control system for lateral irrigators. The alignment control system includes a dampening feature which monitors changes in the lateral displacement of the master and wing of the irrigator relative to each other and based thereon, operates the irrigator to dampen not only the lead-lag oscillations of the wing relative to the master but also the left-wing oscillations of the master about its preferred line of travel. A zero thrust expansion joint is also disclosed which enables the lateral displacement measurements at the joint to be independent of the force of the water pressure in the irrigator tending to push the master and wing apart. The zero thrust expansion joint includes a flexible member whose sides match the cross-sectional area of the pipes of the irrigator. The interior of the flexible member is in fluid communication with the water in the pipes and each side of the flexible member is attached to respective ones of the pipes at the joint. In this manner, the force of the water pressure in the pipes tending to push them apart at the joint is neutralized or isolated so that the sensors only measure lateral displacements due to forces other than the force of the water pressure within the pipes tending to push them apart. In another embodiment of the invention, the pipes are attached together by a relatively tight joint restricting lateral displacement of the pipes relative to each other and in this embodiment, a strain gauge arrangement is used to measure the forces tending to laterally displace the pipes rather than actual, physical displacements of the pipes relative to each other as in the other embodiments.
REFERENCES:
patent: 3587763 (1971-06-01), Kinkead
patent: 3712544 (1971-03-01), Ririe et al.
patent: 3974845 (1976-08-01), Indresaeter
patent: 4085771 (1978-04-01), Hunter
Carson W. Scott
Love John J.
McCarthy Mary
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