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US 5,330,105 AGranted
Aspirating nozzle and accessory systems therefor
AssigneeValkyrie Scientific Proprietary, L.C.
InventorJoseph B. Kaylor
Life of this patent
Estimating the term…
Abstract
An air aspirating nozzle for propelling a stream of foam or a slurry of solid particulates to a target surface includes a stream shaping member within the nozzle to form a rotating, columnar stream of liquid and air which maintains a high degree of coherence over a considerable throw distance. The nozzle assembly may include a flow control unit for the introduction of a foam concentrate or a fluid suspension of particulate solids into the nozzle.
Claims27
An aspirating nozzle, comprising:
- a nozzle body having an upstream end and a downstream end and a wall defining a generally cylindrical fluid passage between said ends, said fluid passage having a first zone of reduced cross sectional area at the upstream end, a second zone of enlarged cross sectional area downstream of said first zone, and a transition zone between said first and second zones;
- a central stream shaping means positioned axially within said fluid passage, said stream shaping means having a head portion and a body portion, the head portion of said means being larger than the body portion but smaller than said first zone and extending into that zone to define an annular space of varying dimension between the stream shaping means and the inner surface of said nozzle wall and a constricted passage between said first and second zones, the body portion of said means extending beyond the downstream end of said transition zone;
- a plurality of vanes extending between the body portion of said stream shaping means and said nozzle body wall, said vanes acting to hold said body portion fixed relative to said nozzle body;
- and
- port means adjacent said transition zone adapted for drawing a stream of ambient air into said fluid passage downstream of said stream shaping means head portion when a liquid is flowing through said passage.
2 more elements
A method for producing an air aspirated liquid comprising:
- passing said liquid through a nozzle, the crosssectional area of said nozzle increasing in a stepwise fashion as the liquid progresses through the nozzle;
- directing the liquid to the inner nozzle wall as it passes a first point whereat the nozzle cross-sectional area increases to thereby form a liquid layer flowing along the inner nozzle wall and a zone of reduced pressure in the nozzle interior;
- aspirating air from the outside of the nozzle through said liquid layer and into said zone of reduced pressure by way of ports located in the nozzle wall at that first point whereat the cross-sectional area increases;
- imparting a rotation to the liquid and air as the streams progress down the nozzle;
- and
- discharging a coherent columnar stream of liquid and air from the nozzle.
3 more elements
A flow control means for an air aspirating nozzle comprising:
- a first valve for controlling the flow of water to said nozzle;
- a housing defining a generally cylindrical fluid passage disposed at the outlet side of said first valve, said housing having a longitudinal axis and adapted for connection to an air aspirating nozzle at its downstream end;
- an auxiliary valve having an inlet and an outlet, said inlet adapted for connection to a fluid source;
- and
- an injector tube, one end of said tube connected to the outlet of said auxiliary valve, said tube communicating between said auxiliary valve and the interior of said housing, said injector tube passing through the wall of said housing at an acute angle thereto, said acute angle as measured between the longitudinal axis of said housing and the longitudinal axis of said injector tube being between 20 and 60.degree., the other end of said tube terminating within said housing as a plane generally perpendicular to the longitudinal axis of said housing.
2 more elements
A system for supplying a liquid fire control agent to an air aspirating nozzle comprising;
- an open-topped container having rigid walls;
- a flexible bag for the containment of a liquid fire control agent disposed within said container;
- piercing means disposed at the bottom of said container, said piercing means adapted to penetrate through the wall of said flexible bag and to provide a conduit between the interior of said bag and the exterior of said container;
- a following means comprising a sliding member conforming to the size and shape of the interior of said container disposed atop said flexible bag, said sliding member arranged to move toward the bottom of said container as the flexible bag is emptied;
- and
- flexible conduit means for connection of said piercing means to a feed port of an air aspirating nozzle.
3 more elements
Dependencies are inferred from the claim text.