This disclosure relates to nozzles for spraying fluid under pressure and more particularly to adjustable nozzles that shape the stream of fluid exiting the nozzle.
Nozzles are used to receive a fluid under pressure and control the shape and other characteristics of the stream of the fluid as it exits the nozzle. Such nozzles typically have an inlet opening, an exit opening that may take the form of a single orifice or multiple orifices, and a fluid flow path extending between the inlet opening and the exit opening. The inlet opening may include a fitting for connecting the nozzle to a tank, flexible hose, or pipe. Nozzles frequently are designed to increase the velocity of the fluid entering the nozzle. This is achieved by providing a fluid flow path that decreases in cross-sectional area from the inlet opening to the exit opening and/or includes an orifice in the fluid flow path of reduced cross-sectional area. Providing such a constriction to fluid flow under constant pressure and constant volume flow rate results in the increase in fluid flow velocity. Typically, the outlet orifice itself of the nozzle is reduced in cross-sectional area relative to the fluid flow path and provides the velocity increase.
A desirable feature of nozzles is the ability to vary the velocity of the fluid exiting the nozzle. In some designs, fluid flow velocity and fluid flow rate are varied by providing a plunger in the fluid flow path that is displaceable toward and away from a constricting orifice, which may be the nozzle exit opening. By advancing the plunger toward the constricting orifice, the cross-sectional area of the flow path between the outer periphery of the plunger and the inner periphery of the orifice is varied. This adjusts the velocity of the fluid exiting the nozzle, which increases the distance the stream travels from the nozzle. Other components, such as valves, may be employed to vary the velocity of fluid exiting the nozzle.
Nozzles with a flow path defined by smooth continuous nozzle walls and an absence of internal obstructions provide laminar fluid flow. Laminar fluid flow is desirable because it optimizes fluid flow through the nozzle and provides a uniform spray from the exit opening. A disadvantage with such adjustable designs is that the addition of a plunger, valve, or other flow regulating component in the fluid flow path of the nozzle presents an obstruction to the flow of fluid through the nozzle that causes turbulent fluid flow. Turbulence in fluid flow through nozzles is undesirable in applications in which a spray from the exit opening that is uniform across the width of the exit opening is desired.
Accordingly, there is a need for a nozzle that adjusts the effective cross-sectional area of the exit opening to vary the shape of the fluid stream from the exit opening but that does not present inclusions or obstructions in the fluid flow path through the nozzle. There is also a need for an adjustable nozzle that can provide a flat stream or fluid from its exit opening that can be varied in width easily.
The present disclosure describes an adjustable nozzle and the method of its operation that optimizes fluid flow through the nozzle and consequently the throw distance and coverage of the fluid stream, and at the same time can be actuated easily by a user to adjust a width of the stream. The disclosed nozzle provides adjustability of the width of the fluid stream without requiring the presence of plungers, valves, or other components in the fluid flow stream. The fluid flow pathway of the nozzle is smooth and free of obstructions, which promotes laminar fluid flow resulting in a fluid flow stream that is uniform along its width and along its length.
In one embodiment, an adjustable nozzle includes a nozzle body having an inlet section with an inlet opening, an outlet section with an outlet opening, and a fluid flow path extending from the inlet opening to the outlet opening. A spray restrictor segment is located in the outlet section. An actuator displaces the spray restrictor segment toward and away from a center of the fluid flow path, thereby varying a pattern of fluid flowing from the fluid flow path through the outlet opening.
In another embodiment, an adjustable nozzle includes a nozzle body having an inlet section with an inlet opening and an outlet section with an outlet opening, the outlet section having a terminal segment with opposed planar, parallel top and bottom walls and first and second opposed planar side walls contiguous with the top and bottom walls. The top and bottom walls are greater in length than the first and second side walls such that the outlet opening is oblong. A fluid flow path extends from the inlet opening to the outlet opening such that fluid exits the outlet opening in a rectangular stream. First and second opposed spray adjustment arms are attached to the outlet section and are extendable into the fluid flow path. The spray adjustment arms each have a planar body terminating in an upstream cam tab, a downstream cam tab, and a rectilinear edge facing a center of the fluid flow path. The upstream cam tabs are received for pivotal movement of the first and second spray adjustment arms in first and second sockets formed in the first and second side walls, respectively.
An actuator ring is rotatably mounted on an end of the nozzle body, the actuator ring having an elliptical groove concentric with a center of the fluid flow path that receives the downstream cam tabs attached to the spray adjustment arms. Rotation of the actuator ring relative to the end of the nozzle body pivots the spray adjustment arms toward and away from the center of the fluid flow path, thereby varying a width of the rectangular stream of fluid from the outlet opening.
In yet another embodiment, a method of varying a width of an oblong stream of fluid exiting an oblong outlet opening in an outlet section of a nozzle body includes actuating an actuator in the outlet section to displace a spray restrictor segment toward and away from a center of the fluid flow path to vary an effective width of the oblong outlet opening, thereby varying the width of the rectangular stream of fluid exiting the outlet opening.
Other objects and advantages of the disclosed adjustable nozzle and method of operation will be apparent from the following description, the accompanying drawings, and the appended claims.
As shown in
The nozzle 101 also includes a spray restrictor segment 201 is located in the outlet section 108. The nozzle 101 also includes an actuator that in embodiments takes the form of an actuator ring 301 that displaces the spray restrictor segment 201 toward and away from a center of the fluid flow path A, thereby varying a pattern of fluid flowing from the fluid flow path through the outlet opening 110. In other embodiments, the actuator may take the form of a lever. In embodiments, the nozzle 101 is made of a rugged, corrosion-resistant material, such as bronze, brass, aluminum, and stainless steel. The type and thickness of material is determined by the type of fluid sprayed and the fluid pressures encountered by the nozzle. In a particular embodiment, the nozzle 101 is sized to be used in firefighting applications.
In an embodiment, the nozzle body 102 includes a transition segment 105 that defines a segment of the fluid flow path A that transitions in the shape of the inner periphery from a round cross section, adjacent the connector 103, gradually and continuously to an inner periphery forming a square or rectangular cross section. In some embodiments, the cross sectional area of the transition segment gradually and continuously decreases in the direction of the fluid flow path A as the walls defining the fluid flow path converge toward the center of the flow path.
As best shown in
A shown in
As shown in
In an embodiment, the actuator ring 301 is connected to the first and second spray adjustment arms 204, 206 to pivot the first and second spray adjustment arms relative to the terminal segment 112 to selectively vary the effective width W of the outlet opening 110. In embodiments, the effective width W of the outlet opening 110 is continuously adjustable by the actuator 301 between the configuration shown in
In an embodiment, the first and second spray adjustment arms 204, 206 are pivotally mounted at the upstream ends thereof to the first and second side walls 118, 120, respectively. And in an embodiment, the first and second spray adjustment arms 204, 206 are pivotally mounted at downstream ends 212, 214 thereof, respectively, to the actuator ring 301. In an embodiment, the actuator ring 301 is rotatably mounted on the nozzle body 102 such that rotation of the actuator ring relative to the nozzle body pivots the first and second spray adjustment arms 204, 206 toward and away from the first and second side walls 118, 120, respectively.
As shown in
In an embodiment, the first and second spray adjustment arms 204, 206 include first and second downstream cam tabs 212, 214, respectively (see also
As shown in
As shown in
In an exemplary embodiment, the disclosed adjustable nozzle 101 includes a nozzle body 102 having an inlet section 104 with an inlet opening 106 and an outlet section 108 with an outlet opening 110. The outlet section 108 includes a terminal segment 112 having opposed planar, parallel top and bottom walls 114, 116 and first and second opposed planar side walls 118, 120 contiguous with the top and bottom walls. The top and bottom walls 114, 116 are greater in width than the first and second side walls 118, 120 such that the outlet opening 110 is oblong. A fluid flow path A extends from the inlet opening 106 to the outlet opening 110 such that fluid exits the outlet opening in a rectangular stream S1, S2.
First and second opposed spray adjustment arms 204, 206 are attached to the outlet section 108 and are extendable into the fluid flow path A. The spray adjustment arms 204, 206 each have a planar body terminating in an upstream cam tab 216, 218 and a downstream cam tab 212, 214 and having planar interior walls 128, 130 forming a rectilinear surface facing a center of the fluid flow path A. The upstream cam tabs 216, 218 are received for pivotal movement of the first and second spray adjustment arms 204, 206 in the first and second sockets 220, 222 formed in the first and second side walls 118, 120, respectively.
An actuator ring 301 is rotatably mounted on an end of the nozzle body 102. The actuator ring 301 has an elliptical groove 302 concentric with a center of the fluid flow path A. The elliptical groove 302 receives the downstream cam tabs 212, 214 of the spray adjustment arms 204, 206 such that rotation of the actuator ring relative to the outlet section 108 end of the nozzle body 102 pivots the spray adjustment arms toward and away from the center of the fluid flow path A, thereby varying a width of the rectangular stream of fluid from the outlet opening.
The actuator ring 301 may take many forms. In embodiments shown in
In an embodiment, the upstream side 324 includes an elliptical groove 303 that receives a resilient elliptical gasket 401 to seal the actuator 301 against the downstream face 136 and provide resistance to relative rotational movement between the nozzle body 102 and the actuator ring 301. The elliptical groove 303 that receives gasket 401 and the elliptical groove 302 that receives the downstream cam tabs 212, 214 are concentric on the upstream side 324 of the face 304 of the actuator ring 301. In an embodiment, the retention studs 316, 318 hold the actuator ring 301 against the outlet section 108 so that the radially inner surface of the side wall 306 overlies and is concentric with the annular side wall 138 of the outlet section 108 but allows rotation of the actuator relative to the outlet section. In an embodiment, the slots 312, 314 define limits of rotation of the actuator 301 relative to the outlet section 108 and are selected with the elliptical groove 302 to coincide with maximum and minimum pivoting movement of the spray adjustment arms 204, 206 to vary the width W of the outlet opening 110.
In an embodiment, the shape (eccentricity) of the elliptical groove 302 is selected and is formed on the upstream side 324 of the face 304 of the actuator ring 301 such that when the major axis of the elliptical groove 302 is parallel to the width W of the outlet opening 110, the spray adjustment arms 204, 206 are pivoted to a maximum divergence angle, as shown in
In an embodiment, a method of varying a width of an oblong stream S1, S2 of fluid exiting an oblong outlet opening 110 in the outlet section 108 of the nozzle body 102 includes actuating an actuator in the form of an actuator ring 301 in the outlet section to displace the spray restrictor segment 201 toward and away from the center of the fluid flow path A to vary an effective width W of the oblong outlet opening 110, thereby varying the width of the rectangular stream S1, S2 of fluid exiting the oblong outlet opening.
In an embodiment, actuating the actuator ring 301 to displace the spray restrictor segment 201 includes pivoting first and second opposed spray adjustment arms 204, 206 attached to the outlet section 108 and extending into the fluid flow path A toward and away from the center of the fluid flow path, thereby varying the effective width W of the oblong outlet opening 110 to vary the width of the oblong stream S1, S2 of fluid from the outlet opening. In an embodiment, actuating the actuator ring 301 to displace the spray restrictor segment 201 includes rotating an actuator ring 301 rotatably attached to the nozzle body 102 to pivot the first and second opposed spray adjustment arms 204, 206 toward and away from the center of the fluid flow path A.
The disclosed embodiments of the adjustable nozzle 101 provide a robust nozzle system that is easily adjustable by a user simply by grasping the actuator ring 301 and rotating it relative to the nozzle body 102 to vary the effective width W of the outlet opening 110 and thereby vary the width of the stream S1, S2 from the outlet opening. The smooth walls of the interior of the nozzle body 102, combined with the rectangular outlet opening 110 provide a flat stream S1, S2 that is uniform across its width and provides a maximum throw for a given fluid pressure.
While the forms of apparatus and methods disclosed herein constitute preferred embodiments of the adjustable nozzle, it is to be understood that the invention is not limited to these precise forms of apparatus and methods, and that changes may be made therein without departing from the scope of the invention.
This invention was made with government support under Contract No. 2127461 awarded by The National Science Foundation. The government has certain rights in the invention.
Number | Date | Country | |
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62880567 | Jul 2019 | US | |
62880567 | Jul 2019 | US | |
62880567 | Jul 2019 | US |
Number | Date | Country | |
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Parent | 17112993 | Dec 2020 | US |
Child | PCT/US2021/038393 | US | |
Parent | 17112990 | Dec 2020 | US |
Child | PCT/US2021/038393 | US |
Number | Date | Country | |
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Parent | 17112993 | Dec 2020 | US |
Child | 17569821 | US | |
Parent | 16595218 | Oct 2019 | US |
Child | 17112993 | US | |
Parent | 17112990 | Dec 2020 | US |
Child | 16595218 | US | |
Parent | 16595218 | Oct 2019 | US |
Child | 17112990 | US | |
Parent | PCT/US2021/038393 | Jun 2021 | US |
Child | 16595218 | US | |
Parent | 16595218 | Oct 2019 | US |
Child | 17112990 | US |