Fluid flow switches with low flow resistance

Details Fluid flow switches with low flow resistance Fluid flow switches with low flow resistance

1989-09-08

1991-05-28

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Flow-responsive type

73745, 200 82E, H01H 3538, H01H 3540

Patent

active

050196782

ABSTRACT:
A flow switch includes a movable shuttle enclosed within a bore having narrower and wider bore sections. The shuttle has a solid cylindrical portion and a vaned portion. When there is no fluid flow from the inlet to the outlet, the shuttle rests on a part-conical portion of the bore. When fluid pressure is applied at the inlet, the shuttle is raised until the vaned portion is partly within the wider bore section. Fluid can then flow through the spaces between the vanes in the vaned portion, and fluid flow is detected by the change in position of the shuttle. The shuttle can be made magnetic, whereupon a magnetic sensing means such as a magnetic reed switch can be used to detect fluid flow. This arrangement has the advantage that resistance to flow and pressure drop are minimal compared to previous designs.

REFERENCES:
patent: 4213021 (1980-07-01), Alexander
patent: 4581941 (1986-04-01), Obermann
patent: 4763114 (1988-08-01), Eidsmore
patent: 4792651 (1988-12-01), Whiting
patent: 4843886 (1989-07-01), Koppers

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