US 3070315 A
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1962 J. M. LANDRY 3,070,315
ROTATING SPRINKLER I Filed April 28, 1961 2 Sheets-Sheet '1 IN VEN TOR. J4 COBUS M. L AND]? Y 1 ATTORNEY Dec. 25, 1962 .1. ML LANDRY 3,070,315
ROTATING SPRINKLER Filed April 28, 1961 2 Sheets-Sheet 2 INVENTOR. JAOOBUS M. LA/VDRY 3,070,315 ROTATTNG SPRINKLER .lacohus M. Landry, RR. 1, Summerland,
British Columbia, Canada Filed Apr. 28, 1961, $81. No. 106,209 11 Claims. (Cl. 239-232) An object of this invention is to provide means for rotating a sprinkler with intermittent motion and means for accelerating slow intermittent rotation of the sprinkler into rapid movement and vice versa at certain positions of the are of rotation during each revolution of the sprinkler thereby to determine angulardistribution of water in predetermined directions.
Another object of the invention is to provide a sprink ler assembly set in intermittent rotation by the inertial forces of a volume of water which latter is intermittently caused to flow and stop in a circular path or conduit disposed in a plane generally perpendicular to the axis of rotation of the sprinkler.
Another object of the invention is to provide in a rotary sprinkler, means to intermittently set in motion and stop Water in a circular conduit in a plane generally perpendicular to the axis of rotation of the sprinkler, by diverting water under pressure alternately into said circular conduit and into another discharge conduit, the discharge from said conduits forming auxiliary nozzles of said sprinkler, so that a primary sprinkler discharges water near the peripheral portion of the area sprinkled, and auxiliary nozzles sprinkle the portions nearer the center of the area.
Another object of the invention is to provide a rotatable primary sprinkler with means to by-pass part of the Water flow from said primary sprinkler to an operating chamher; and providing a circular conduit connected to one side of said chamber and disposed in a plane generally perpendicular to the axis of rotation of said sprinkler, and an alternate discharge conduit, and means in said chamber operated by the pressure of the by-passed water to alternately direct water to said circular conduit and to said alternate discharge conduit so that the alternate stopping of the flow in said circular conduit exerts a turning moment for intermittently turning said sprinkler; and means enacting with the water flow from said primary sprinkler for accelerating the turning movement of said sprinkler for a predetermined are of its circle of rotation.
I am aware that some changes may be made in the general arrangements and combinations of the several devices and parts, as Well as in the details of the com struction thereof without departing from the scope of the present invention as set forth in the following specification, and as defined in the following claims; hence I do not limit my invention to the exact arrangements and combinations of the said device and parts as described in the said specification, nor do I confine myself to the exact details of the construction of the said parts as illustrated in the accompanying drawings.
With the foregoing and other objects in view, which will be made manifest in the following detailed description, reference is had to the accompanying drawings for the illustrative embodiment of the invention, wherein:
FIG. 1 is a top plan view of a. sprinkler constructed in accordance with my invention.
'16. 2 is a side view of the sprinker. FIG. 3 is a cross-sectional view of the sprinkler the 7 section being taken on the line 3-3 of FIG. 1, showing the accelerator shield or deflector in accelerating position, and
FIG. 4 is a front view of the sprinkler.
In the illustrative embodiment of my sprinkler assembly, an outer nipple 1 is threaded in a usually vertical ice pipe 2. An inner nipple 3 is journalled in the outer nipple 1. The inner end of the inner nipple 3 has thereon a head or flange 4. A packing Washer 6 is held Within the pipe 2 around the inner nipple 3 between the inner end of the outer nipple 1 and said head 4, so that the pressure of the water-flow presses the washer 6 into tight engagement with the inner end of the outer nipple 1.
An elbow 7 is screwed on the top end of the inner nipple 3 so as to determine the angle of the primary nozzle relative to the axis of rotation of said pivot or inner nipple 3. The elbow 7 is screwed into the lower end of a lay-pass chamber S of a rotation regulator 9.
in the upper end of the by-pass chamber 8 is screwed an adapter bushing H. A nozzle conduit 12 is screwed into the top of the adapter bushing 11. Into the outer end 13 of the nozzle conduit 12 is screwed a suitable sprinkler nozzle 14, which is the primary sprinkler nozzle of my device.
Into the oppsite aligned ends of the elbow 7 and bushing 11 is secured a cylindrical screen 16 spaced from the Walls of said by-pass chamber 8 for screening the ay-passed waterflow before the water enters the regulator in the herein illustration, the regulator 9 includes a split substantially flat diaphragm casing, which has a base casing half 17 and a top casing half 18. The casing halves l7 and 18 are dished oppositely outwardly to deline a diaphragm chamber 19. The outer periphery of each casing half has a flat circular flange 21. A suitable diaphragm 22 has its outer peripheral portion clinched between the casing flanges 21. Suitable screws 23 secure the casing flanges 21 together.
' The diaphragm 22 divides the diaphragm chamber 19 into a base half and an upper half. A by-pass conduit 24 connects the by-pass chamber 8 to the upper half of the diaphragm chamber 19 in the top half 18 of the casing. A side conduit 26 extends from the bypass conduit 24 into the base half 17 of the diaphragm chamber 19.
In the center of the base half 17 is an outlet nipple 27, the inner end of which is formed into valve seat 28. In the center of the top half 18 is a top outlet nipple 29, the inner end of which is formed into a top valve seat 31. The valve seats 23 and 31 are in axial alignment with one another on an axis perpendicular through the center of the diaphragm 22. In the center of the diaphragm 22 is fixed a double valve 32, the opposite valve heads of which are adapted to be seated alternately in the respective valve seats 28 and 31 according to the direction of flexing of the diaphragm 22.
A cup 33 is secured on each side of the diaphragm 22. Each cup 33 is centered about the axis of the double valve 32 and is so positioned that the concave dished face of each cup 33 faces toward'the adjacent valve seat 28 or 31 respectively. The function of these cups 33 is to resist the flexing of the center portion of the diaphragm 22. The cups 33 on the opposite sides of the diaphragm 22 are back to back. As the pressure is unbalanced, as
ereinafter described, so as to flex the diaphragm in one direction, then the diaphragm assumes the respective dotted line bulging position shown in FIG. 3, because of the comparative stiffness of the middle portion of the diaphragm 22. Then the middle portion of the diaphragm is snapped so that the adjacent valve is set tightly on the respective valve seat 28 or 31. The cups 33 also prevent sharp bend of the diaphragm and prevent exeessive tilting of the double valve 32.
The center plane of the casing and the diaphragm 22 are at right angles to the axis of rotation of the inner nipple 3,'whieh is the 'axis about which the primary nozzle 14 rotates. The axis of the valve seats 28 and 31 is generally parallel withsaid axis of rotation and is offset from said axis of rotation diametrically oppositely to the primary nozzle 14, so as to distribute the rotatable weight evenly about the rotation axis.
A right angle elbow 36 is screwed on the outer end of the upper outlet nipple 29. A spiral circular conduit 37 has its central end suitably secured to the elbow 36. The outer end of the circular conduit 37 terminates in a discharge end 38 tangential to the circle of the conduit 37 and generally at right angles to the diametrical plane extending through said axis of rotation and through said valve axis and the axis of said primary nozzle. Thus said discharge end 38 is substantially at right angles to said primary nozzle 14 and projects clockwise, viewing FIG. 1, in the direction of rotation of said primary nozzle 14 about said rotation axis of said inner nipple 3. A right angle elbow 39 on said discharge end 38 holds an auxiliary nozzle 41 discharging parallel with said primary nozzle 14.
A second auxiliary discharge conduit 42' is connected by a right angle elbow 43 to the lower outlet nipple 27 so that the right angle elbow 43 discharges diametrically oppositely to the upper right angle elbow 36. The secnd discharge conduit 42 is curved directly to a discharge end 44 parallel with the auxiliary nozzle 41 and has a second auxiliary nozzle 46 secured in its end so located that said first auxiliary nozzle 41 is offset between said second auxiliary nozzle 46 and said primary nozzle 14, all three nozzles discharging in parallel directions. A bracket 47 holds the second auxiliary discharge end 44 on the lower casing half 17. Suitable clips 48 hold the circular conduit 37 on the top casing half 18.
The body 49 of the bypass chamber 8 is integral with the lower casing half 17 and supports the regulator 9 in fixed position relatively to the primary nozzle 14.
The accelerating device includes a deflecting hood 51, which is supported on spaced arms 52 pivoted on pivot screws 53. The pivot screws 53 are screwed into and through opposite sides of a sleeve 54 so as to also function as set screws to hold the sleeve 54 in position on the nozzle conduit 12. A stirrup 56 has its legs secured to said arms 52 and is also pivoted on the pivot screws 53, but said stirrup 56 extends at angle to said arms so that a cam follower finger 57 thereof has its curved edge 58 in contact with the periphery of a horizontal cam 59. The hub 61 of the cam 59 is secured on the reduced end 62 of the outer nipple 1 by a suitable set screw 63. Thus the cam 59 is in a plane at right angles to the axis of rotation of the sprinkler assembly. As shown in broken lines in FIG. 1, the cam 59 is circular around about two thirds of its circumference and is then flattened on angular lines on the remaining third of its circumference. The angle of the stirrup 56 relatively to the arms 51 is such that when its follower finger 57 follows the circular part of the cam 59 it raises the deflector hood above the nozzle 14 into an out of the way position, as shown in FIG. 2, but when the finger 57 reaches the flattened third of the cam 59, it lowers the deflector hood 51 in the path of the jet of water issuing from the primary nozzle 14 and converts the force of the water jet into rapid turning force for rapidly turning the nozzle 14 over said one third path of its rotation until the finger 57 again returns to the circular two thirds of the cam 59.
The deflecting hood 51 is a concave shield, with an open side 64 on the trailing side of the hood with respect to the direction of rotation of the sprinkler assembly. The tapered leading side 66 of the hood is closed. Thus the jet of water from the nozzle 14, in the position shown in FIG. 3, is deflected in the direction of the open side 64, generally in a contra-clockwise direction viewing FIG. 1., and the reaction force thereof exerts a turning moment on the sprinkler for accelerating the rotation of said sprinkler.
In operation as the water is discharged through the primary nozzle 14, with the hood 51 in the out of way position, shown in FIG. 2, some of the water is bypassed through the by-pass chamber 8 and through the by-pass conduits 24 and 26 into the diaphragm chamber 19 and to both sides of the diaphragm 22.
On account of the flexibility of the diaphragm, the valve 32 fixed on the central part of the diaphragm, can move relatively to the part of the diaphragm between the center and the periphery. As the distance that valve can travel between the two valve seats 28 and 31 is relatively short, the val"e 22 cannot remain in stable equilibrium between the two valve seats, as any slight motion of the valve toward one valve seat, restricts the aperture and so reduces the pressure on the part of the valve in close proximity of the valve seat, which further pushes the valve toward the seat, until the valve closes the aperture.
Thus the valve 32 necessarily closes one or the other outlet from the chamber 19. When one outlet is thus closed, the water ceases flowing in the corresponding conduit to the corresponding nozzle and the pressure in the conduit becomes the atmospheric pressure. The valve is then maintained against the seat. The force maintaining the valve against the seat is the internal pressure in the chamber 19, exerted on a surface equal to the section of the valve seat aperture, the size of the surface of the valve on which only atmospheric pressure is exerted.
While one outlet is thus closed, the water entering on the corresponding side of the diaphragm, into the chamber 19 and having no outlet there, flexes the diaphragm 22 toward the other side, where the water is under lower pressure, being in a flow with a downward pressure gradient from the diversion chamber 8 to an auxiliary nozzle. This flexing of the diaphragm produces a tension in it and consequently, the pressure differential increases. A comparatively small pressure differential on the two sides of the diaphragm, exerted as it is on a much larger surface than the section of the aperture of the valve mentioned above, is suflicient to overcome the force maintaining the valve against the other seat.
The same sequence of motions of the diaphragm and of the valve is then repeated, but in an opposite direction and repeated again indefinitely in alternately opposite directions as long as an adequate water supply to the sprinkler is maintained. This automatic cycle of operation of the regulator 9 is then repeated intermittently. The time lag between the portions of the diaphragm toward the side of the open valve seat and the increase "of the tension to a force to snap the valve from the closed seat to the open seat, predetermines the time interval between the alternate diversions of the flow of water, to the nozzle 41 through the outlet nipple 27 and the conduit 37 and to the nozzle 46 through the outlet nipple 29 and the conduit 42.
One such cycle of the operation of the sprinkler can be divided into four phases: (all references to clockwise and counterclockwise are as viewing FIG.1).
During one phase, the downward directed tension of the diaphragm 22 opens the valve seat 31 and closes the aperture of the valve seat 28. During this phase the flow of water to the nozzle 41, through the conduit 37 is accelerated by the pressure force of the water until the reactive force of the stream, at the nozzle, increasingly compensating the pressure force there, the flow becomes constant. Simultaneously, the water flowing to the nozzle 46, during the preceding cycle, is stopped.
During a second phase, the valve seat 31 remains open, the flow to the nozzle 41 remains constant and the water to the nozzle 46 in the conduit 42 remains stationary.
During a third phase, the tension of the diaphragm opens the aperture of the valve seat 28 and closes the aperture of the valve seat 31. During this phase the flow of water to the nozzle 41 is stopped. Simultaneously, the flow to the nozzle 46 is accelerated until the reactive force at the nozzle balances the internal pressure force and the flow becomes constant.
During a fourth phase, the aperture of the valve seat 31 remains closed, the water in the conduit 42 to the nozzle 4-1 remains stationary and the flow to the nozzle 46 remains constant.
The intermittent rotation of the assembly depends on the magnitude and the direction of the moment tending to turn the assembly about its axis, during the phases of each cycle.
During the second and fourth phases, when the flow is constant, the forces exerted internally on the assembly cancel out and the moment is due only to the reactive force of the stream issuing from either offset nozzle and is clockwise in direction. It is not suflicient to overcome the static friction of the washer 6.
During the first and third phases, the flow of water being principally clockwise to the nozzle 41 and principally counterclockwise to the nozzle 46, but being accelerated in one conduit when it stops in the other, the inertia of the water in both conduits acts in the same direction at any one time, namely counterclockwise during the first phase and clockwise during the third phase. The duration of these phases is very short. The moment tending to turn the assembly and due to these inertial forces is more than sufficient to overcome the static friction of the washer 6 and .so to impart a certain momentum to the assembly.
During the first phase, however, the moment is reversed. At the beginning it is counterclockwise, being due to the forces accelerating the flow to the nozzle 41 and stopping the flow to the nozzle 46, and at the end of the phase it is due to the reactive force at the nozzle 41 and is clockwise. There is then a braking action on any momentum acquired by the assembly during this phase and consequently the counterclockwise angular motion of the assembly can only be of small amplitude.
During the third phase, the turning moment is com pounded of the inertial and the reactive forces all clockwise, there is no braking action on the momentum of the assembly and the amplitude of its clockwise angular motion is greater than that of the preceding counterclockwise motion.
It is the difference in amplitude between the clockwise and the counterclockwise motions which results in the intermittent clockwise rotation of the sprinkler.
The frictional resistance of the washer 6 must remain sufficient to prevent spinning of the assembly by the reactive force of the flow, at one or the other auxiliary nozzle, regardless of the fluctuations of the pressure that can occur in sprinkler systems. Keeping in mind that the reactive force of the flow at the auxiliary nozzle (the pressure force there) and the pressure on the washer 6, both vary as the square of the velocity of the flow, it will be seen that this condition is satisfied for the range of pressure above that necessary to lift the weight of the rotatable assembly and to press tightly the washer 6 between the end of the outer nipple 1 and the flange 4 of the inner nipple 3.
The conditions effecting the control of the spin of the assembly are: an appropriate amount of offset for the auxiliary nozzles, in relation to the diameter of the washer 6 and the choice of a material with an appropriate coefficient of friction for the washer.
As the sprinkler assembly is thus turned intermittently around the two-thirds circular part of the cam 59, the deflector hood 51 is in the out of the way position shown in FIG. 2. When the sprinkler assembly is rotated to where the follower finger reaches the beginning of the flattened cam portion, the deflector 51 is lowered in front of the primary nozzle 14, as shown in FIG. 3, and the reactive force of the water jet on the hood 51 and on the sprinkler assembly, accelerates the rotation and spins the sprinkler assembly around the remaining one-third of its circular rotation rapidly. Thereafter the intermittent rotation is again resumed as heretofore described.
The device herein is simple; it has minimum moving parts; it operates positively in a predetermined manna and is eminently adapted for uniform orchard irrigz tion, so as to sprinkle the proper volume of water on circular area. The main nozzle 14 sprinkles the are near the periphery of the sprinkled area and the auxiliar nozzles sprinkle the areas nearer the sprinkler. The on third area overlapped by the next sprinkler in a series c sprinklers is skipped by reason of said acceleration ac complished through said cam.
1. in a sprinkler device the combination with a mai: nozzle on a main nozzle conduit extended at an angle fron and journalled in a water supply conduit; of an inter mittent rotating device comprising a casing supported 0: said main nozzle conduit, a pair of chambers in said cas ing, by-pass means to conduit water flow from said mai1 nozzle conduit to said chambers, an outlet from eacl chamber, a valve for each outlet, an auxiliary nozzl conduit leading from each chamber, an auxiliary nozzl on each auxiliary nozzle conduit, means to alternatel close and open said valves so that said chamber out lets are opened sequentially, said auxiliary nozzle con duits being offset relatively to the journal axis of sait main nozzle conduit so that turning moment about th' journal axis of the main nozzle conduit exerted by wate flowing through said chambers and said nozzle conduit are balanced by the inertia and the resistance of the jour nalled sprinkler unit and said balance is momentarilj upset by each stoppage of flow in one of said auxiliar nozzles so as to turn said main nozzle conduit about sait journal axis intermittently in accordance with said se quential and alternate closing of said valves.
2. The sprinkling device defined in claim 1, wherein saii one auxiliary nozzle conduit is formed generally in th shape of an involute of a cylinder centered about tht outlet of said one auxiliary conduit, said auxiliary nozzle being extended parallel with said main nozzle and offset lit one side with respect to said journal axis and the auxiliar nozzle on said one auxiliary nozzle conduit being betweei the main nozzle and the other auxiliary nozzle.
3. A sprinkler device comprising a journal adapted it be secured in the end of a supply conduit, a nozzle sup port element rotatably held in said journal, a main nozzlr conduit extended from and at an angle to the axis of rota tion of said support element, a main nozzle on said mail nozzle conduit, a rotating device interconnected in sair main nozzle conduit for imparting intermittent rotating movement to said main nozzle conduit and to said sup port element about the axis of said journal, said rotating device including a pair of chambers, means to by-pas flow of water from said nozzle conduit to each chamber said chambers being mounted on said nozzle conduit, a1 outlet for outflow of water from each chamber, a1 auxiliary nozzle conduit connected to each outlet, a1 auxiliary nozzle on each conduit, and means actuated b1 the water in the respective chambers to alternately ant sequentially close the respective outlets, the frictional re sistance at said journal, the inertia of the device, and tht kinetic energy of the water flow in said conduit bein balanced so as to normally overcome turning moment on said rotating device, and being momentarily un balanced by each stoppage of flow in one of said auxiliar nozzle conduits.
4. The sprinkler device defined in claim 3 wherein sai one secondary nozzle conduit being longer than the othe secondary nozzle conduit and being curved in the shapl of an involute of a cylinder about an axis offset relativel to the axis of said journal and the auxiliary nozzle 01 said one auxiliary conduit being nearer said journal axi than the other auxiliary nozzle.
5. In a sprinkler device, a journal adapted to be secure in the end of a supply conduit, a main nozzle condui extended from said journal at an angle to the axis of sai journal, a main nozzle on said main conduit, means t apply intermittent turning movement to said main nozzll :onduit, including a bypass interconnected in said main lozzle conduit, a casing extended from said by-pass, a lexible partition dividing the casing in two chambers, said )Y-PHSS discharging into both chambers, an outlet from :ach chamber, valves on the opposite sides of said flexble partition for closing the respective outlets, said fiexble partition normally holding said valves spaced from he respective outlets and moving the valves alternately n outlet closing position when flexed by the differential )ICSSUIC in said chambers caused by the closing of one :hamber while the outlet of the other chamber is open, in auxiliary nozzle conduit extended from each chamber )utlet, an auxiliary nozzle on each auxiliary nozzle conluit, one of said auxiliary nozzle conduits being generally tpiral circular in a plane at right angles to the axis of otation of said journal whereby the reaction of each atoppage of flow in said one nozzle conduit momentarily )verbalances the balance of forces about said journal axis and imparts a brief turning motion to said nozzle device.
6. The sprinkler device defined in claim 3, said outlet :losing means comprising a valve seat on each outlet facing said partition, said valve seats being aligned axially an an axis at right angles through the center of said flex- Ible partition, a concave stiffener element on each side 3f said partition around each valve, the concave side of :ach element facing toward the respective adjacent valve seat so as to stifien the said middle portion of said parti- :ion, prevent the tilting of said valve means and to narrow the space between the cup and the closed valve seat thereby to aid in reducing pressure on the opposite side of said partition at the open valve seat and correspondingly to increase the pressure on the side of the partition adjacent said closed valve seat.
7. The sprinkler device defined in claim 5, a hollow bearing element on the supply conduit, said journal being rotatable and axially slidable in said bearing element, means to limit the axial sliding of said journal, and sealing means between said limiting means in said supply conduit and said bearing element being pressed by water pressure in said conduit into frictional engagement with said bearing element.
8. In a sprinkler device, a main nozzle journalled on a supply conduit, and auxiliary nozzle means actuated by water flow from said conduit to intermittently turn said main nozzle, and being turnable with said main nozzle; means to impart constant accelerated turning to said main nozzle over a part of its rotation, comprising, a cam on said supply conduit having a circular cam portion concentric with the axis of rotation of said main nozzle and flattened non-circular eccentric portion; a deflecting hood pivotally supported on said main nozzle so as to be swingable into the path of flow from said main nozzle and being capable of converting the force of said water flow from the main nozzle into turning moment about said axis of rotation, and a follower arm extended from said deflecting hood so as to bear against said cam, the angle of said follower arm with respect to said hood being such as to hold said deflector hood in an out of the way position relatively to said main nozzle when following said concentric circular portion of said cam and to move said hood into the path of the flow from the nozzle when following said eccentric portion of said cam thereby to eccelerate the constant turning of said main nozzle over the arc of its rotation corresponding to said eccentric portion of said cam.
9. In a rotary sprinkler device, a main nozzle conduit adapted to be rotatably held on a water supply conduit, a main nozzle on said nozzle conduit, discharging at an angle to the axis of rotation of the nozzle conduit; means to impart intermittent rotating force to said main nozzle conduit including, means to bypass water flow from said nozzle conduit, a pair of opposite spaced auxiliary nozzle conduits, means to support said auxiliary conduits fixedly with respect to said main conduit and in generally parallel planes at an angle to said axis of rotation, an auxiliary nozzle on each of said auxiliary conduits olfset relatively to said main nozzle, means to direct said by-passed water alternately to said auxiliary conduits, said auxiliary conduits being offset relatively to said axis of rotation so as to convert the inertia of alternating water flow and stoppage of flow through said auxiliary conduits into turning moment about said axis of rotation.
10. The rotary sprinkler device defined in claim 9, wherein at least one of said auxiliary conduits includes a circular portion in said parallel plane.
11. The rotary sprinkler device defined in claim 9, wherein at least one of said auxiliary conduits includes a circular portion in said parallel plane, said auxiliary nozzles are offset so as to discharge water generally in the same direction as the discharge from said main nozzle and so as to coact with said inertia action in said auxiliary conduits about said axis of rotation for said intermittent turning.
References Cited in the file of this patent UNITED STATES PATENTS 1,308,371 Roach July 1, 1919 1,640,751 Buelna Aug. 30, 1927 1,832,205 Harris Nov. 17, 1931 1,876,099 Thompson Sept. 6, 1932 2,288,394 Coies et al. June 30, 1942 2,654,635 Lazzarini Dec. 6, 1953 2,942,789 Smith June 28, 1960