Fluid sprinkling – spraying – and diffusing – Flow deflecting or rotation controlling means – Deflector and terminal flow element
Patent
1985-01-22
1986-04-08
Peters, Jr., Joseph F.
Fluid sprinkling, spraying, and diffusing
Flow deflecting or rotation controlling means
Deflector and terminal flow element
239DIG7, 169 37, B05B 126, A62C 3708
Patent
active
045807299
ABSTRACT:
A fire protection sprinkler head which can reduce or substantially eliminate frame shadow effects that produce non-uniformity in spray pattern. The head is of the known type having a base with a throat through which fire retardant fluid flows and two or more frame arms which extend outwardly from the base and joint in an arch-form to support, in the path of fluid discharged from the throat, a central boss which deflects the fluid outwardly. It is found that a surprising reduction in frame shadow affects is obtained by constructing the frame arms to conform to the set of three essential parameters: (1) the portion of each frame arm in the region adjacent the boss is shaped and positioned to intercept the stream profile to a depth of at least one third the distance from the outside periphery to the center of the profile; (ii) the angle of the leading edge of each frame arm in this fluid intercept region, relative to the axis of flow, is less than about 25 degrees; and (iii) the cross-section of each frame arm in the fluid intercept region is slender, its length being two or more times the thickness of the frame arm, with the surfaces of each frame arm shaped to guide the fluid intercepted by that frame arm to flow into the region immediately downstream of its trailing edge.
REFERENCES:
patent: 1797919 (1931-03-01), Loepsinger
patent: 3525402 (1970-08-01), Hattori
patent: 3716103 (1973-02-01), Tanaka
patent: 4279309 (1981-07-01), Fischer et al.
patent: 4405018 (1983-09-01), Fischer
"Extended Coverage Horizontal Sidewall Spindlers (F950)", Grinnell Fire Protection Company, Inc., Sep. 1982.
"Model `A` Center Strut Automatic Sprinkler", Central Sprinkler Company, product specification sheet.
"Upright and Pendant Sprinklers (F980)", Grinnel Fire Protection Systems Company, Inc., Oct. 1984.
"Micromatic.TM. Sprinkler Model M", Viking Sprinkler Company, (Aug. 1981).
Product Literature, Grunau Sprinkler Manufacturing Division.
Davidson David P.
Grinnell Fire Protection Systems Co., Inc.
Peters Jr. Joseph F.
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