Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
  • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
  • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
  • B05B3/06—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction
  • B05B3/063—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction using a member, e.g. a deflector, for creating the tangential component of the jet

Definitions

• the present invention relates to a self-adjusting jet breake device, particularly for impact sprinklers.
• the breaker device according to the invention can be mounte on impact sprinklers of the type described, for example, i the Italian patent application No. 85608 A/90 in the name o this same Applicant.
• Such sprinklers generally comprise spout which is connected to a supply line by means of braked rotary coupling, with a terminal nozzle for generatin a jet and an oscillating arm provided with a baffle whic periodically interferes with the jet.
• the baffle In said sprinklers, the baffle, during its interference wit the jet, captures part of the kinetic energy of said jet imparting to the arm an instantaneous rotary torque whic tends to cause both the oscillation of the arm and th rotation of the spout in steps of preset breadth.
• the baffl furthermore has the function of periodically breaking th fluid column so as to distribute the water proximate to th sprinkler as well.
• the aim of the present invention is to provide a jet break device which allows to significantly increase the be frequency for an equal jet pressure.
• An object of the present invention is to provide a sel adjusting jet breaker device which is able to improve t breakup of the jet especially at low pressures, leaving i maximum range substantially unchanged.
• Another object of the present invention is to provide a je breaker device which can interact with the jet.in one or bot of the rotation directions of the sprinkler.
• Not least object of the present invention is to provide a je breaker device which has an extremely simple and economica structure.
• a jet breaker device of this type can be applied to existin impact sprinklers so as to significantly increase the bea frequency and intensify the breakup of the jet in one or bot of the directions in which the sprinkler rotates about it own vertical axis.
• Figure 1 is a general perspective view of a jet breake device according to the invention, installed on a per s known impact sprinkler;
• Figure 2 is a top view of the arrangement of Figure 1;
• FIG. 3 is an enlarged perspective view of the jet breake device of Figures 1 and 2;
• Figure 4 is a diagram of the operation of the device o Figure 3;
• Figure 5 is a perspective view of a second embodiment of th device according to the invention.
• Figure 6 is a view of the device of Figure 5 in a differen operating condition
• Figures 7 and 8 are schematic views of the operation of th device shown in Figures 5 and 6.
• a jet breaker device is mounted on a impact sprinkler designated by the letter I.
• the sprinkle comprises a spout T which has a braked coupling R at one end Coupling 12 can rotate about a vertical axis, and is adapte to connect the spout to a pressurized water supply line Coupling R is also rigidly associated with a frame, which i not shown in the drawings.
• a nozzle U for generating a jet G is arranged at the free en of the spout T, while an oscillating arm B is pivote proximate to its central portion.
• a baffle D is arranged a the outer end of the arm and is used to periodically an impulsively capture part of the energy of the jet in order t make the arm oscillate about its fulcrum and thereby rotat the spout about its own vertical axis.
• the jet breaker device 200 comprises one or more activ surfaces which can be anchored to the arm B, for example, i an intermediate position between its oscillation axis and th baffle, so as to interact at least once with the jet betwee two successive oscillations of the arm.
• th device 200 might also be mounted at a greater distance fro the baffle, achieving the same final result.
• th device 200 comprises a pedestal 201 which is anchored to th arm B, by means of a fixing plate 202, on one side wit respect to its centerline M.
• a bracket support 203 is fixe at the top of the pedestal 201 and is provided with a groove guide 204.
• Guide 204 slidingly accommodates a blade 20 provided with a sharp edge 207 and with an elongated fixin hole 208.
• the active surface of the device, which is intende to interfere with the jet is constituted by the lower fac of the blade 206.
• Blade 206 is fixed in position along th guide 204 of the support 203 by means of a bolt 209 whic passes through the elongated hole 208. It is thus possible t arrange the device 200 on one side or on both sides wit respect to the longitudinal axis of the arm B, so that the blade interferes with the jet during the rotation of the sprinkler in one direction or in both directions.
• the bracket support 204 is inclined with respect to the axis of the pedestal 201, so that the blade 206 forms an angle ⁇ with the longitudinal axis M of the arm B.
• the height of the pedestal 201 and the shape of the bracket support 204 are also such that the blade is at a minimum distance H from the longitudinal axis of the arm.
• the jet G initially interacts with the baffle D, causing the arm B to rotate downward without encountering the jet breaker device.
• the blade 206 of the jet breaker 200 will begin to skim the jet G, being approximately parallel to the axis thereof, as indicated by the position 206' shown in broken lines in Figure 4.
• a substantially nil perpendicular force acts on the blade, while the positive sharpening angle of the leading edge of the blade facilitates its penetration in the jet.
• the negative incidence of t blade 206 with respect to the jet gradually increases. Thu in this step part of the jet is progressively deflecte downward, giving said jet a peculiar fan shape.
• the reacti F which acts at right angles and upward on the blade als increases correspondingly, generating a braking torque on th arm, i.e. a torque which tends to dampen the downwar oscillation and to cause the early reversal of the directio of rotation of the arm, which coincides with its lower strok limit.
• the braking torque will be maximum in the lowe position, designated by 206" in Figure 4, which coincide with the position in which the blade enters the jet durin the upward movement of the arm.
• the blade 206 interacts with the jet G, exerting a accelerating torque on the arm, i.e. a torque which tends t facilitate its upward movement.
• blade inclination angles comprised between 15° and 30°, and preferably equal t approximately 25°, give the best results in varying th frequency and breakup of the jet.
• the distance H can var according to the size of the baffle D and according to th distance from the arm oscillation axis.
• the second embodiment of the jet breaker differs from th first one in that it has a pair of active surfaces havin different inclinations, instead of a single surface.
• the active surfaces are constituted by the lowe faces of two deflector wings 210, 211 which extend radiall and on opposite sides of a ratchet 212.
• Ratchet 212 i mounted on the adjustable-length pedestal 201 so as to b able to rotate vertically.
• the wings 210 and 211 have convex shape, similar to a wing contour, with a median axi which forms respective angles ⁇ - ⁇ and ⁇ 2 with respect to th longitudinal axis of the arm.
• the ratchet 212 can b rotated manually and retained in two diametrically opposit fixed positions, so as to expose only one of the wings 21 and 211 to the jet, as clearly shown in Figures 5 and 6.
• Figures 7 and 8 schematically illustrate the fact tha operatively the angle ⁇ j is such that the median axis of th wing 210 is approximately parallel to the direction of th jet during transit through said jet. Therefore, the wing 21 is used mainly to break up the jet without transmittin appreciable forces to the arm during its oscillation.
• the angle ⁇ of the wing 211 is such that the je is always inclined with respect to the wing 211 during it interference. This will cause, on the lower surface of th wing 211, a thrust with a perpendicular component F directe upward, which applies a clockwise torque to the arm, with a effect similar to the one described for the model of Figur 3.
• th jet breaker device achieves th intended aim and objects and in particular it is noted tha it produces an optimum distribution and breakup of th jet together with an increase in the beat frequency in a automatic manner, i.e. adapting to both high and low je supply pressures.
• the device according to the invention i also simple and economical to manufacture and easy t install on existing sprinklers with no modification of thei structure.

Landscapes

• Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
• Lighting Device Outwards From Vehicle And Optical Signal (AREA)
• Nozzles (AREA)
• Catching Or Destruction (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=11424691

Family Applications (1)

Country Status (6)

Family Cites Families (7)

• 1991
  • 1991-06-27 IT ITVI910105A patent/IT1247226B/it active IP Right Grant
• 1992
  • 1992-05-21 AT AT92910648T patent/ATE121645T1/de active
  • 1992-05-21 EP EP92910648A patent/EP0591241B1/de not_active Expired - Lifetime
  • 1992-05-21 AU AU17674/92A patent/AU1767492A/en not_active Abandoned
  • 1992-05-21 WO PCT/EP1992/001140 patent/WO1993000169A1/en not_active Ceased
  • 1992-05-21 DE DE69202248T patent/DE69202248T2/de not_active Expired - Lifetime

Non-Patent Citations (1)

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