Cold weather low flow miniature spray nozzle assembly and method
A low flow compact spray head design for cleaning applications, especially for camera lens wash includes a miniature spray nozzle head which is about 5 mm in diameter or less for a single direction spray nozzle and about 8 mm in diameter of less for a nozzle with multiple sprays. The washer fluid is fed from the bottom of nozzle along a flow axis and is separated into two flows via two power nozzles or inlets which turn the flows 90° to become opposing jets impinging upon each other inside an interaction region. Uniform stream lines are generated by the two direct facing jets and converge at the nozzle throat to become a uniform spray fan, which is on a plane perpendicular to the axis of cylindrical nozzle head. This fluidic circuit design enables a miniature size low flowrate nozzle to operate well consistently with low flow rate (e.g., a flow rate of about 150 mL/min to about 300 mL/min at 25 psi, or even a flow rate of about 250 mL/min at 25 psi or above, at a viscosity of about 25 CP) at cold temperate (−4° F. or lower) with 50 percent ethanol. This nozzle design is capable of generating two or more different oriented spray fans (e.g., fans spraying in opposing directions) from one single nozzle.
1. A miniaturized low-flow, fluid conserving multi-spray shear nozzle assembly, comprising:
an insert member having a first and a second entry lumen that are: (i) each aligned along a vertical axis of a nozzle housing, and (ii) in fluid communication with a transverse throat that forms an interaction region, wherein the transverse throat, having a first exit and an opposite second exit, is located within a common plane that intersects with the vertical axis so as to define an unobstructed flowpath along the common plane;
wherein the nozzle housing is formed separately from the insert member and encloses an interior volume which is configured to receive the insert member;
wherein an interior lumen in a terminal, lower end of the insert member is in communication with the first and second entry lumens of the insert member;
wherein a first exit aperture and second exit aperture are defined through a sidewall in the nozzle housing; and
wherein pressurized fluid flows along the vertical axis into the interior lumen, through the first and second entry lumens, and into the interaction region, and is then redirected to flow out of the first exit and the first exit aperture to form a first spray and, separately, out of the second exit and the second exit aperture to form a second spray.
2. The shear nozzle assembly of claim 1 , wherein the first spray and the second spray are a generally uniform spray fan on a plane generally perpendicular to the vertical axis.
3. The shear nozzle assembly of claim 1 , wherein the first entry lumen and second entry lumen have a larger area than the interaction region.
4. The shear nozzle assembly of claim 1 , wherein the first entry lumen, second entry lumen, and interaction region are formed at a terminal upper end of the insert member so that the pressurized fluid flowing along the vertical axis comes into contact with an inner surface of the nozzle housing.
5. The shear nozzle assembly of claim 1 , wherein the first spray is ejected from the first exit aperture at a different angle relative to the common plane in comparison to that of the second spray ejected from the second exit aperture.
6. The shear nozzle assembly of claim 1 , wherein the first spray from the first exit and first exit aperture includes an aim of 0 degrees and a roll of 0 degrees while the second spray from the second exit and second exit aperture includes an aim of −10 degrees and a roll of 10 degrees.
7. The shear nozzle assembly of claim 4 , wherein the interaction region includes a cross sectional slot-shaped lumen extending along the terminal, upper end between the first and second entry lumens.
8. The shear nozzle assembly of claim 1 , wherein the nozzle housing and insert member are formed by molding.
9. The shear nozzle assembly of claim 1 , wherein a separation angle between the first and second sprays is about 30 degrees.
10. The shear nozzle assembly of claim 1 , wherein a separation angle between the first and second sprays is about 45 degrees.
11. The shear nozzle assembly of claim 1 , wherein a separation angle between the first and second sprays is about 90 degrees.
12. The shear nozzle assembly of claim 1 , wherein a separation angle between the first and second sprays is about 180 degrees.
13. The shear nozzle assembly of claim 1 , wherein the first spray and the second spray are a generally uniform spray fan projecting along the common plane.