Abstract:
A rotary sprinkler in accordance with an embodiment of the present disclosure includes a riser with a nozzle assembly rotatable mounted thereon. The nozzle assembly includes a pressure regulator and flow control element.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    The present application claims benefit of and priority to U.S. Provisional Patent Application No. 61/423,400 entitled PRESSURE REGULATOR IN A ROTATIONALLY DRIVEN SPRINKLER NOZZLE HOUSING ASSEMBLY, filed Dec. 15, 2010, the entire content of which is hereby incorporated by reference herein. 
     
    
     BACKGROUND 
       [0002]    1. Field of the Disclosure 
         [0003]    The present disclosure relates to a rotating sprinkler including both pressure regulation and flow throttling provided in the nozzle assembly. 
         [0004]    2. Related Art 
         [0005]    The benefits of pressure regulation for sprinklers are well known to the irrigation industry such as discussed in the background sections of U.S. Pat. Nos. 4,913,351 and 6,997,393, the entire content of each of which is hereby incorporated by reference herein. 
         [0006]    Pressure regulation is typically provided at an inlet in the base of the sprinkler as is described in U.S. Pat. Nos. 4,913,351 and 6,997,393, for example. As a result, in order to install or replace such pressure regulation elements, it is necessary to replace the entire sprinkler. 
         [0007]    Accordingly, it would be desirable to provide a sprinkler that includes pressure regulation in the nozzle assembly to allow for easy installation and/or replacement. 
       SUMMARY 
       [0008]    A rotary driven, i.e. water turbine, water driven ball drive, or water reaction driven irrigation sprinkler nozzle assembly in accordance with an embodiment of the present disclosure includes a pressure regulator preferably incorporated into the center of the nozzle assembly body and also includes a reference pressure chamber connected to atmospheric pressure with a spring bias enclosed to bias a pressure responsive movable member that is connected to an upstream pressure balanced flow throttling valve. 
         [0009]    The sprinkler includes pressure regulation, flow throttling and flow shut off, if desired. 
         [0010]    A sprinkler assembly in accordance with an embodiment of the present application includes a body, a riser movably mounted in the body and in fluid communication with a water supply including a flow path for water provided to the sprinkler assembly from the water supply and a nozzle assembly rotatably mounted on the riser and in fluid communication with the riser. The nozzle assembly may include a center flow passage in fluid communication with the flow path of the riser, a nozzle mounted in the nozzle assembly and in fluid communication with the center flow passage, the nozzle configured to direct water out of the nozzle assembly, and a pressure regulator provided in the nozzle assembly and configured to maintain a desired pressure at an inlet area of the nozzle. 
         [0011]    A nozzle assembly for use in a sprinkler assembly in accordance with an embodiment of the present application includes a riser in fluid communication with a water supply including a flow path for water provided to the sprinkler assembly from the water supply and a nozzle housing rotatably mounted on the riser and in fluid communication with the riser. The nozzle housing includes a center flow passage in fluid communication with the flow path of the riser, a nozzle mounted in the nozzle housing and in fluid communication with the center flow passage, the nozzle configured to direct water out of the nozzle housing, and a pressure regulator provided in the nozzle housing and configured to maintain a desired pressure at an inlet area of the nozzle 
         [0012]    Other features and advantages of the present disclosure will become apparent from the following description of the invention, which refers to the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0013]      FIG. 1  shows a cross sectional view of a riser assembly and nozzle assembly of a typical water turbine driven sprinkler with a nozzle exit pressure regulator incorporated in the center of the rotating nozzle assembly. 
           [0014]      FIG. 2  shows an expanded view of the upstream pressure balanced flow throttling valve in the riser assembly of  FIG. 1  which may also be used to throttle the range or shut off flow to the nozzle housing outlet passage where a changeable nozzle is shown installed in the exit side passage of the nozzle housing. 
           [0015]      FIG. 3  shows a cross section of the rotating nozzle assembly of  FIG. 1  including the drive shaft and a nozzle discharge pressure regulator mechanism. 
           [0016]      FIG. 4  is an expanded cross sectional line drawing of the upper rotating nozzle assembly of  FIG. 1 . 
           [0017]      FIG. 5  is an expanded cross sectional line drawing of the upper part of the rotary driven sprinkler of  FIG. 1 . 
       
    
    
     DETAILED DESCRIPTION OF THE EMBODIMENTS 
       [0018]      FIG. 1  illustrates a cross sectional view of a riser  1  and a nozzle assembly  2  of a typical water driven gear drive sprinkler. The nozzle assembly  2  is rotatably mounted on the riser  1 . The details of this type of sprinkler are generally described in U.S. Pat. No. 7,226,003, the entire contents of which are hereby incorporated by reference herein. A nozzle  3  is provided at the outlet of the nozzle assembly  2  to direct water out of the assembly. An exit pressure regulator  4  is incorporated on the center axis of the nozzle assembly  2 . A nozzle drive shaft  14  is also provided on the center axis of the nozzle assembly  2 . 
         [0019]    The pressure regulator  4  preferably includes a cylindrical chamber  34  with a pressure responsive member  8  slidably mounted for axial movement therein. See  FIG. 4  also. A low friction sliding lip seal  22  may be provided between the member  8  and the sidewalls of the chamber  34 . A bias spring  9  is housed in the pressure chamber  34  above the pressure responsive member  8  and biases the member  8  downward. The chamber  34  is vented to the atmosphere at opening  35 . Atmospheric pressure is the preferred reference pressure for the pressure chamber  34 . If desired, an opening to the threads  36  may be used as an atmospheric vent instead of the separate opening  35 . 
         [0020]    The bias spring  9  may be preloaded by screwing the reference chamber top end closure cap  10  downwardly via the threads  36  to increase the preload of bias spring  9  against the top of the pressure responsive member  8 . 
         [0021]    Center hole  37  (See  FIG. 3 ) below the pressure responsive member  8  opens into the center flow passage  38  (See  FIG. 4 ) of the nozzle housing  2 . The center flow passage  38  is connected by flow turning vanes  19  to the inlet area  20  of nozzle  3 . 
         [0022]    As shown, the pressure responsive member  8  is connected by shaft  11  to the upstream cylindrical flow throttling valve member  5 . As the pressure at the inlet area  20  of the nozzle  3  rises above a desired level, which may be set by the preload of bias spring  9  on the pressure responsive member  8 , the pressure responsive member will move upward against the force of the bias spring  9 . This will lift the connecting rod  11  and the flow throttling valve member  5 . The flow throttling valve member  5  moves upward to reduce the circumferential flow area  13  that provides flow into internal flow area  40  of the nozzle drive shaft  14 . The flow through the nozzle drive shaft  14  exits into the flow path area  38  of the nozzle housing  2  and then onward to the nozzle  3  where it passes through exit area  15  and out of the rotating nozzle housing  2 . Reducing the flow area  13  reduces the flow of water into the area  40  and the flow area  38  such that the pressure at the inlet area  20  of the nozzle is decreased as desired to maintain a substantially constant nozzle discharge pressure even for fluctuating or high inlet pressures. 
         [0023]    An insert ribbed (see rib  7 B) supports center plug  7  for the cylindrical valve member  5  that forces the flow around the outside circumference at  17  of the valve member  5  so that it can be flow controlled at circumferential flow area  13  at the top of the throttling valve member  5 . The cylindrical throttling valve member  5  is thus pressure balanced since its upper and lower axial acting pressure surfaces see approximately the same pressure and their axially exposed pressure area is relatively small. The throttling pressure load on the valve member is carried normal (i.e. at an angle of about 90 degrees) to its axis of movement so as to have minimum effect on the pressure responsive member load relative to its bias spring. 
         [0024]    The valve member  5  may also be used as a shut off valve to shut off flow to the discharge nozzle  3  completely. The bias spring  9  is axially attached to the top of the pressure responsive member  8  and also to the underside of the threaded cap  10  of the reference pressure chamber  34 . Thus, when the cap  10  is rotated in the threads  36  such that the cap backs up out of the chamber  34 , the bias of spring  9  will be removed from the pressure regulating member  8 . As a result, the entire assembly including pressure regulating member  8 , the connecting rod  11  and the valve member  5  will be lifted up to close off the flow through the circumferential area at  13 , and thus, shut off flow to the nozzle  3 . This will allow a user to change the nozzle  3 , for example, without getting wet. Further, since the flow to the nozzle  3  may be turned off without shutting off the water supply to the sprinkler itself, the riser  1  will remain popped up and out of the ground such that the nozzle  3  is easily accessible. 
         [0025]    The upstream flow throttling valve  5  includes a cylindrical ring  23  supported by ribs  23 A from the center activation shaft  11 . See  FIG. 2 , for example. The lower inside area of this cylindrical sleeve valve member is vented in between its support ribs  23 A as shown at  23 B. Flow throttling occurs between the top of cylindrical edge  26  (see  FIG. 5 ) of the cylindrical valve member, or ring,  23  and the outside circumference of the nozzle drive shaft center hole area  40 . 
         [0026]    Although the present invention has been described in relation to particular embodiments thereof, many other variations and modifications and other uses will become apparent to those skilled in the art.