Spray nozzle assembly with one piece spray nozzle and quick disconnect retention cap
A spraying apparatus comprising a plurality of spray nozzle assemblies mounted along a liquid supply boom. The spray nozzle assemblies each include a one piece spray nozzle and retention cap ( 20 ) having an upstream cap section ( 21 ) and a downstream nozzle section ( 22 ) integral with the cap section. The cap section ( 21 ) is formed with internal camming and locking grooves ( 25 ) for drawing the cap section into mounted position on a liquid inlet stem ( 12 ) as an incident to rotation of the cap, and the nozzle section ( 22 ) has a liquid inlet passage ( 41 ) communicating with the inlet stem ( 12 ) for directing a discharging liquid spray. A pre-orifice insert ( 60 ) is mounted within the spray nozzle and retention cap ( 20 ) which has a smaller diameter nozzling passage section, and an intermediate section ( 24 ) of the one piece spray nozzle and retention cap ( 20 ) is formed with air passageways communicating between the pre-orifice liquid flow passage and outside ambient air.
1. A liquid spray nozzle ( 10 ) for mounting on a liquid inlet stem ( 12 ) having external locking lugs ( 18 ) comprising:
a one piece spray nozzle and retention cap ( 20 ) having an upstream cap section ( 21 ) and a downstream nozzle section ( 22 ) integral with the cap section ( 21 );
said cap section ( 21 ) being formed with camming and locking grooves ( 25 ) for drawing the cap section ( 21 ) onto said liquid inlet stem ( 12 ) and into a locked position as an incident to rotation of the cap section ( 21 ) onto the liquid inlet stem ( 12 ); and
said nozzle section ( 22 ) having a liquid inlet passage ( 41 ) communicating with said liquid inlet stem ( 12 ) when in said locked position and at least one discharge orifice ( 40 ) communicating with the nozzle section liquid inlet passage ( 41 ) for directing a liquid spray discharge from the nozzle section ( 22 ).
2. The liquid spray nozzle of claim 1 in which said nozzle section 22 is formed with a transverse chamber ( 42 ) communicating with said nozzle section liquid inlet passage ( 41 ), and said nozzle section ( 22 ) having a plurality of said discharge orifices ( 40 ) each defined by a respective cross slot ( 51 ) in an end of said nozzle section ( 22 ) communicating with said transverse chamber ( 42 ).
3. The liquid spray nozzle of claim 1 in which said one piece spray nozzle and air cap ( 20 ) includes an intermediate section ( 24 ) between and integral with said cap section ( 21 ) and nozzle section ( 22 ).
4. The liquid spray nozzle of claim 1 including an annular seal ( 28 ) disposed within said one piece spray nozzle and retention cap ( 20 ) for positioning in sealed engagement with an end of said liquid inlet stem ( 12 ).
5. The liquid spray nozzle of claim 1 in which the cap section ( 21 ) of said one piece spray nozzle and retention cap ( 20 ) has a pair of outwardly extending diametrically opposed gripping ears ( 27 ) to facilitate assembly and disassembly of the one piece spray nozzle and retention cap ( 20 ) on the liquid inlet stem ( 12 ).
6. The liquid spray nozzle of claim 3 in which the intermediate section ( 24 ) of the one piece spray nozzle and retention cap ( 20 ) is defined in part by semi-cylindrical wall sections ( 30 ) smaller in diameter than the cap section ( 21 ), and said nozzle section ( 22 ) of said one piece spray nozzle and retention cap ( 22 ) is an elongated rectangular member ( 35 ) as viewed from a downstream end of the nozzle section ( 22 ) extending outwardly from an end wall ( 36 ) of the intermediate section ( 24 ).
7. The liquid spray nozzle of claim 6 in which said nozzle section ( 22 ) is formed with a transverse chamber ( 42 ) parallel to the elongated rectangular member ( 35 ) communicating with said nozzle section inlet passage ( 41 ), and said nozzle section ( 22 ) having a plurality of said discharge orifices ( 40 ) each defined by a respective cross slot ( 44 ) in an end of the rectangular member ( 35 ) of the nozzle section ( 22 ) communicating with the transverse chamber ( 42 ).
8. The liquid spray nozzle of claim 1 including a pre-orifice insert ( 60 ) mounted within said one piece spray nozzle and retention cap ( 20 ) having a pre-orifice central liquid flow passage ( 61 ) for communicating with said liquid supply stem ( 12 ), said pre-orifice central liquid flow passage ( 61 ) including a small diameter nozzling passage section ( 64 ) for accelerating liquid flow to the nozzle section ( 21 ).
9. The liquid spray nozzle of claim 8 including an annular seal ( 28 ) disposed within said one piece spray nozzle and retention cap ( 20 ) for positioning in sealed engagement with an end of said liquid inlet stem ( 12 ), and said pre-orifice insert ( 60 ) having an enlarged diameter mounting flange ( 63 ) interposed between said annular seal ( 28 ) and said one piece spray nozzle and retention cap ( 20 ).
10. The liquid spray nozzle of claim 8 in which said one piece spray nozzle and retention cap ( 20 ) has a plurality of ambient air passages ( 66 ) communicating between said pre-orifice central liquid flow passage ( 61 ) downstream of said nozzling passage section ( 64 ) of said pre-orifice insert ( 60 ) and ambient air outside said spray nozzle and retention cap ( 20 ) through which ambient air is drawn into liquid as an incident to passage of liquid through said pre-orifice small diameter nozzling section ( 64 ) for facilitating liquid atomization upon discharge from said discharge orifice ( 40 ).
11. The liquid spray nozzle of claim 10 in which said one piece spray nozzle and air cap ( 20 ) includes an intermediate section ( 24 ) between and integral with said cap section ( 21 ) and nozzle section ( 22 ), and said ambient air passages ( 66 ) communicate through said intermediate section ( 24 ).
12. The liquid spray nozzle of claim 8 in which said central liquid flow passage ( 61 ) of said pre-orifice insert ( 60 ) includes a liquid inlet section ( 62 ) communicating upstream with said nozzling section ( 64 ) and a downstream outwardly opening conical discharge section ( 65 ) communicating downstream with said nozzling section ( 64 ).
13. The liquid spray nozzle of claim 12 in which said nozzle section ( 22 ) of said one piece spray nozzle and retention cap ( 20 ) defines an expansion chamber downstream of said spray pre-orifice insert ( 60 ) larger in diameter than the outwardly opening conical discharge section ( 65 ) of the pre-orifice insert ( 60 ).
14. The liquid spray nozzle of claim 11 in which the pre-orifice insert ( 60 ) and intermediate section of said one piece spray nozzle and air cap ( 20 ) define an annular chamber communicating between ambient air outside said spray nozzle and retention cap ( 20 ) and said pre-orifice insert air passages ( 66 ).
15. A liquid spraying apparatus comprising:
a spray boom ( 10 ) for connection to a liquid supply;
a plurality of spray nozzle assemblies ( 11 ) mounted on the spray boom ( 10 );
said spray nozzle assemblies ( 11 ) each including a liquid inlet stem ( 12 ) having a central liquid passageway ( 15 ) communicating through a side of the spray boom ( 10 );
said spray nozzle assemblies each including a one piece spray nozzle and retention cap ( 20 ) having an upstream cap section ( 21 ) and a downstream nozzle section ( 22 ) integral with the cap section ( 21 );
said cap section ( 21 ) being formed with internal camming and locking grooves ( 25 ) for drawing the cap section ( 21 ) onto said liquid inlet stem ( 12 ) and into a locked position as an incident to rotation of the cap section ( 21 ) on the liquid inlet stem ( 12 ); and
said nozzle section ( 22 ) having a liquid inlet passage ( 41 ) communicating with said liquid inlet stem ( 12 ) and at least one discharge orifice ( 40 ) communicating with the nozzle section liquid inlet passage ( 41 ) for directing a liquid spray discharge form the nozzle section ( 22 ).
16. The liquid spraying apparatus of claim 1 in which said one piece spray nozzle and air cap ( 20 ) includes an intermediate section ( 24 ) between and integral with said cap section ( 21 ) and nozzle section ( 22 ).
17. The liquid spraying apparatus of claim 15 including a pre-orifice insert ( 60 ) mounted within said one piece spray nozzle and retention cap ( 20 ) having a pre-orifice central liquid flow passage ( 61 ) for communicating with said liquid supply stem ( 12 ), said pre-orifice central liquid flow passage ( 61 ) including a small diameter nozzling passage section ( 64 ) for accelerating liquid flow to the nozzle section ( 21 ).
18. The liquid spraying apparatus of claim 17 including an annular seal ( 28 ) disposed within said one piece spray nozzle and retention cap ( 20 ) for positioning in sealed engagement with an end of said liquid inlet stem ( 12 ), and said pre-orifice insert ( 60 ) having an enlarged diameter mounting flange ( 63 ) interposed between said annular seal ( 28 ) and said one piece spray nozzle and retention cap ( 20 ).
19. The liquid spraying apparatus of claim 17 in which said one piece spray nozzle and retention cap ( 20 ) has a plurality of ambient air passages ( 66 ) communicating between said pre-orifice central liquid flow passage ( 61 ) downstream of said nozzling passage section ( 64 ) of said pre-orifice insert ( 60 ) and ambient air outside said spray nozzle and retention cap ( 20 ) through which ambient air is drawn into liquid as an incident to passage of liquid through said pre-orifice small diameter nozzling section ( 64 ) for facilitating liquid atomization upon discharge from said discharge orifice ( 40 ).
20. The liquid spraying apparatus of claim 19 in which said one piece spray nozzle and air cap ( 20 ) includes an intermediate section ( 24 ) between and integral with said cap section ( 21 ) and nozzle section ( 22 ), and said ambient air passages ( 66 ) communicate through said intermediate section ( 24 ).