Abstract:
The present application belongs to fluid control equipment, in particular, relates to directional controlling mechanism of fluidic sprinkler, comprising a rear reversing mechanism, a front reversing mechanism and a signal stream switching mechanism. A limiting shift rod of the rear mechanism rotate around a locating rod as the center after touching a limiting ring, then realize the reversing of the limiting shift rod. The reverse action of the limiting rod will finally lead a reversing arm to rotate by way of driving a reversing locating block, a rear reversing rod and a front reversing rod to rotate. The rear reversing mechanism, the front reversing mechanism and the signal stream switching mechanism act together, so as to switch a left-side signal stream nozzle and a right-side stream nozzle of a fluidic sprinkler, and bring about the reversing of the rotation direction of the fluidic sprinkler. Directional controlling mechanism of fluidic sprinkler is in a stepping state respectively in the clockwise and the counter clockwise working modes, so that the impact force on a rotary body is small, critical components tend to have a longer working life, an intermediate position does not exist during the reversing of the sprinkler, and the switching of the sprinkler is stable and reliable.

Description:
FIELD OF THE DISCLOSURE 
       [0001]    The application belongs to fluid control equipment, in particular, relates to directional controlling mechanism of fluidic sprinkler, attributing to the technical field of a jet device. 
       BACKGROUND OF RELATED ART 
       [0002]    Sprinklers are one of the key pieces of equipment in an irrigation system, and its performance directly affects the quality of sprinkling irrigation. Theory and structural design of two-ways step running complete fluidic sprinkler of PXSB type(Drainage and Irrigation Mechanical, 2008, fifth) purpose a bi-directional stepping fluidic sprinkler. The working principle of which is adding a bi directional stepping reversing mechanism on the basis of the original sprinkler, thereby changing the rotation direction of the sprinkler by changing the location of the spool in the reversing mechanism and switching the direction of the signal stream, such that bi directional stepping is reached. Chinese patent No. CN101972722 entitled “external water intake jet wall control element”, when compared with the traditional fluidic sprinkler, shows the external water intake signal external water intake is located at the outside of the outlet cover. The injector intakes signal water and air to discontinuity form a low-pressure vortex in one side of the jet so as to make flow attach the wall and promote the rotation of the sprinkler. The high and low pressure on the either side of the main jet is switched through the opening and closing of the reverse air hole, so that a reversing motion is realized. The sprinkler is simple and reliable, but when the sprinkler is used for remote jet sprinkler, reversing process is continuous motion such that greater reversing impact force will contribute to the abrasion of the reversing mechanism, and signal nozzle is lashed by high-speed main jet causing the abrasion of the signal nozzle and the wear nozzle is difficult to adjust, all the shortage above will lead to the shot life of the sprinkler. In Chinese patent No. CN 102962149A entitled “reversing control mechanism of fluidic sprinkler,” the inverting mechanism, limiting device, nozzle and pipe of the present application coordinate each other to realize forward stepping, backward steeping and switching of the sprinkler. However, the reference has a nozzle that is easy to abrade, contributing to the decline of service life of the sprinkler. China Patent No. CN102962152A entitled “bi directional synchronous fluidic sprinkler”, the sprinkler is two-way step motion which solve the problem that the impact force produced by reversing process of the fluidic sprinkler abrade the reversing mechanism. However, in the process of reversing the switch, there is an intermediate state, which leads to the signal stream nozzle does not intake water and influence the stability of the sprinkler. In view of drawbacks of the patents mentioned above, the present applications provides a directional controlling mechanism of fluidic sprinkler, solving the problem that bi directional synchronous fluidic sprinkler does not stable in the switching process effectively. 
       SUMMARY 
       [0003]    The present application aims to overcome the defects of the existing technology, to provide a directional controlling mechanism of fluidic sprinkler with a stable, reliable and reasonable structure, to further enhance and improve the performance of the existing fluidic Sprinkler, to make sprinkler work and switch stably. 
         [0004]    The technical scheme for solving the technical problem of the application is that the directional controlling mechanism of fluidic sprinkler comprising front and rear reversing mechanism, reversing mechanism and signal stream switching mechanism. The limiting shift rod of the rear reversing mechanism rotate centered at a locating rod under the driving force of the nozzle after touching a limiting ring, the limiting shift rod will rotate to the other side rapidly under the spring pre load when the limiting shift rod rotate to the vertical position, meanwhile reversing positioning block is driven. The rear reversing rod will rotate due to the change of the reversing positioning block and the rear reversing rod of the front reversing mechanism rotates around the rear rotating axis will drive the reversing spring to change. Under the force of the reversing spring, the front rotating rod is reversing rod rotates centered at a front rotating axis, and the reversing arm rotates. The front reversing mechanism, the rear reversing mechanism and the signal stream switching mechanism cooperate so perfectly that left signal stream nozzle and right signal stream nozzle switch successfully and the rotation direction of the fluidic sprinkler is changed. 
         [0005]    The first bearing of the directional controlling mechanism of fluidic sprinkler is two bearings, so as to limit the rotation displacement of the reversing rod in the vertical direction, and reduce the friction resistance between the rear reversing rod and the rear rotating shaft. 
         [0006]    The included angle between the limiting rod and the center line of the reversing positioning block satisfied α≦170, β≦170°. The axis of rear rotation axis, the front rotation axis and the spray body are in the same section. The rotation angle of the front reversing rod meet 5°≦γ≦15°. The distance between the cover plate and the inlet center of the left signal nozzle and the right signal nozzle is 1 mm≦L≦2 mm. The deflection between the left signal nozzle and lever is ε≦15°, and the deflection between the right signal nozzle and lever is δ≦15°. 
         [0007]    Advantages of the present application are as follows: the impact force of the directional controlling mechanism of fluidic sprinkler on rotating body is tiny, the present application has a long service life, the application work in the state of stepping whether in clockwise or anti clockwise, and there is no intermediate position in the reversing process of the nozzle so that the nozzle is stable and reliable. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0008]      FIG. 1  is a front view of a fluidic sprinkler. 
           [0009]      FIG. 2  is a perspective view of an example of the safety device according to the teachings of the present disclosure in another direction. 
           [0010]      FIG. 2  is a cross-sectional view taken across line A-A in  FIG. 1 . 
           [0011]      FIG. 3  is a cross-sectional view taken across line B-B in  FIG. 1 . 
           [0012]      FIG. 4  is a cross-sectional view taken across line C-C in  FIG. 1 . 
           [0013]      FIG. 5  is a cross-sectional view taken across line D-D in  FIG. 1 . 
           [0014]      FIG. 6  is a schematic diagram of the limiting rod when fluidic sprinkler in reversing position. 
           [0015]      FIG. 7  is a schematic diagram of the reversing positing block when fluidic sprinkler in reversing position. 
       
    
    
     DETAILED DESCRIPTION 
       [0016]    In the description of the present application, it is necessary to understand some terms, such as “center”; “endwise”, “ transverse” and “length” and “width” and “thickness”, “above” and “below”, “front” and “rear”, “left” and “right” and “vertical” and “horizontal”, “top” and “bottom” “inside” and “outside”, “clockwise”, anti clockwise,” the direction or position, of which, indicates the direction or position based on the drawing. The terms mentioned above are only used to describe the application and facilitate the description, rather than the indicate device or element referred to must have a particular position, by which the application is constructed and operated. 
         [0017]    In addition, the terms such as “first”, “second” are used only for describing purpose and should not to be interpreted as the indication to the relative importance or to amount of the technical characteristics. Thus, the characteristics of the “first” and “second” are used to express or indicate to one or more features. In the description of the present application, the meaning of “multiple” is two or more than two features, unless other specific limiting is presented. 
         [0018]    In the present application, the terms such as “install”, “link”, “connect”, “fix”, etc. should be broadly understood unless other specific regulations and limitation are presented. For example, the connection can be fixedly connection, be detachably connection or as a whole; be a mechanical connection, be electrically connected; be directly connected, be indirectly connected through an intermediary, even be connection between two internal component and interrelation of two element. One of ordinary skill in this field can understand the implication of the terms in the present application according to specific conditions. 
         [0019]    In the present application, unless other specific regulation and limitation is presented, the meaning of first feature above or below second feature can be first feature contact second feature directly, or it can also be arranged such that first feature contacts second feature through another feature rather than directly. Furthermore, the position word “above,” top,” “on,” or “between” first feature and second feature should include first feature being above or oblique above second feature and the first feature high than second feature in highlight. The position word “below,” under,” “down,” between first feature and second feature should include first feature being below or oblique below second feature and the first feature low than second feature in highlight. The following is further illustration with the figures showing specific embodiments, but the protection scope of the application is not only limited to these. 
         [0020]    As shown in  FIG. 1 ,  FIG. 2  and  FIG. 4 , a directional controlling mechanism of fluidic sprinkler includes front and rear reversing mechanism, reversing mechanism, signal stream switching mechanism apply the present application. The limiting rod  1  of the reversing mechanism rotates with the locating rod  8  after touching a limiting ring  2 . Thereupon, the limiting rod  1  rotates to other side rapidly with the force of the adjusting spring  4  while the limiting rod  1  rotates up to the vertical position and, simultaneously, drives the motion of the reversing positing block  10 , which will drive the rear rotation in a reverse direction. The rear reversing rod  11  of the front reversing mechanism rotates with the rear rotating axis  12  will drive the reversing of the reversing spring  18 , the front reversing  25  rotate with the front rotation axis  24  and drives the reversing arm  40  rotating in the force of the reversing spring  18 . The reversing mechanism, the front reversing mechanism and the signal stream switching mechanism cooperate each other so as to realize the switching of the left signal nozzle  42  and t the right signal nozzle  43 , such that the reversing of rotation direction of the fluidic sprinkler can be realized. 
         [0021]    The rear reversing mechanism includes limiting rod  1 , liming ring  2 , first limiting pin  3 , adjusting spring  4 , sleeve  5 , first pin  6 , second pin  7 , positioning rod  8 , limiting sleeve  9 , reversing positing block  10 , spray body  36 , limiting screw  47 . The positioning rod  8  is arranged in the spray body  36  and the limiting sleeve  9  is press fit outside of the spray body  36 . The limiting screw  47  go through the limiting sleeve  9  and is fixed on the spray body  36  so as to limit the limiting sleeve  9  rotating centered at the positioning rod  8 . The limiting rod  1  and the reversing positing block  10  are installed on the positioning rod  8 . The second pin  8  is fixed on the positioning rod  8  to limit the axial displacement of the limiting rod  1  along the positioning rod  8 . The sleeve  5  is positioned on the inside of the positioning block  10  by the first pin  6 . The adjusting spring  4  is arranged in the sleeve  5 , with the first limiting pin  3  which is fixed on the limiting rod  1  to limit the position of lower end of the adjusting spring  4 . 
         [0022]    The front reversing mechanism includes rear reversing rod  11 , rear rotation axis  12 , first bearing  13 , third pin  14 , fourth pin  15 ; second spacer pin  16 , shim  17 , reversing spring  18 , fifth pin  19 ; spring sleeve  20 , locating axis  21 ; second bearing  22 , sixth pin  23 , front rotation axis  24 , front reversing rod  25 , extension plate  28 , pre-stressed bolt  29 , short supporting bar  30 , minor spacing ring  31 , reversing plate  32 , medium spacing ring  33 , jet tube  34 , and larger spacing ring  35 . The minor spacing ring  31 , medium spacing ring  33  and larger spacing ring  35  are respectively fixed on the outside of the jet tube  34  by a fastening bolt. The rear rotation axis  12  is installed on the larger spacing ring  35 . The first bearing  13  is arranged between the rear reversing rod  11  and the rear rotation axis  12 . The first bearing  13  has two bearings so as to limit the rotation motion of the rear reversing rod  11  in vertical direction and reduce the friction resistance between the rear reversing rod  11  and the rear rotation axis  12 . The third pin  14  inserts through the hole on top of the rear rotation axis  12  to limit vertical motion of the first bearing  13 . The short supporting bar  30  is fixed on the minor spacing ring  31 . One end of the extension plate  28  is arranged on the top of the short supporting bar  30  and the connection is fastened by the pre-stressed bolt  29 . The front rotation axis  24  is installed on the pre-stressed bolt  29 . The second bearing  22  is fixed between the front rotation axis  24  and the front reversing rod  25 . The sixth pin  23  is inserted through the hole on top of the front rotation axis  24  to limit axial displacement of the second bearing  22 . The rear rotation axis  12 , the front rotation axis  24  and the spray body  36  are in the same section. The locating axis  21  is built in one end of the front reversing rod  25 . The spring sleeve  20  is put on the locating axis  21 . The fifth pin  19  is inserted through the hole on top of the locating axis  21  to limit axial displacement of the spring sleeve  20 . The reversing spring  18  is mounted in the spring sleeve  20 . The second spacer pin  16  limits the position of one end of the reversing spring  18 , which is fixed in the hole of the rear reversing rod  11 . The fourth pin  15  is inserted through the hole on top of the second spacer pin  16  to limit vertical displacement of the second spacer pin  16 . The shim  17  is arranged on the second spacer pin  16  so as to reduce friction between the second spacer pin  16  and the rear reversing rod  11 . The reversing plate  32  is press fit on the outside of the medium spacing ring  33  by tightening screw, and therefore, the rotation angle of the second spacer pin  16  and the front reversing rod  25  can be controlled from 5° to 10°. 
         [0023]    As shown in  FIG. 2 , the signal stream switching mechanism includes left inlet tubule  38 , left signal pipe  39 , reversing arm  40 , left supporting rod  41 , left signal nozzle  42 ; right signal nozzle  43 , right supporting rod  44 , right signal pipe  45 ; right inlet tubule  46 . The left supporting rod  40  is fixed on the front end of the front reversing rod  25  by tightening screw. The left supporting rod  41  and the right supporting rod  44  are respectively installed on the reversing arm  40 . The left signal pipe  39  is mounted in the hole of the left supporting rod  41  by a tightening screw and the right signal nozzle  43  is mounted in the hole of the right supporting rod  44  by a tightening screw. The left inlet tubule  38  and the right inlet tubule  46  are all arranged on the fluidic element  27 . The left inlet tubule  38  is connected to the right inlet tubule  46  by the left signal pipe  39  and the right signal nozzle  43  is connected with the left inlet tubule  38  by the right signal pipe  45 . 
         [0024]    As shown in  FIG. 1  and  FIG. 3 , the distance between the intake center of the left signal nozzle  42  and the right signal nozzle  43  and the cover plate  26  is controlled among 1 mm to 2 mm; the deflection between the left signal nozzle  42  and level is ε≦15° and the deflection between the right signal nozzle  43  and level is δ≦15°. 
         [0025]    As shown in  FIG. 5 , limiting screw  47  go through the limiting sleeve  9  and fixed on the spray body  36  so as to limit the limiting sleeve  9  rotating with the positioning rod  8 . As shown in  FIG. 6  and  FIG. 7 , the included angle between the limiting rod  1  and the center line of the reversing positioning block  10  satisfied α≦170 , β≦170° in reversing position. 
         [0026]    The working of directional controlling mechanism of fluidic sprinkler is first: a stage of stepping rightward. When stepping clockwise, the limiting rod  1  and the reversing positing block  10  are located against left side of the limiting sleeve  9 . The rear reversing rod  11  rotates to the right limiting position centered at the rear rotating axis  12  and the front reversing rod  25  rotate to the right limiting position centered at the front rotating axis  24 . Meanwhile, the left signal nozzle  42  intakes signal water, which will go through the left signal pipe  39 , then enter the right inlet tubule  46  and ultimately flow into the right-side parts of the jet element  27 , which is part of the signal water in the jet element  27  adding in main jet meanwhile others stay in vortex region. When the water in the vortex region is accumulated to a critical volume, the pressure difference between the left and right cavities will push main jet to the right side and make the main jet curve. Finally, the main jet attaches to the right wall and the sprinkler will step to the right. Owing to the bending of main jet, the left signal nozzle  42  cannot intake signal water and air passes through the left signal nozzle  42 , then enters the left signal pipe  39 , and finally flow into the left part through the right inlet tubule  46 , the sprinkler will jet straight when the pressure difference between left and right cavity is negligible. The sprinkler steps to the right side by switching stepping state and jet straight state repeatedly. 
         [0027]    The second stage involves switching from stepping to the right side to stepping to the left side. The limiting rod  1  moves in a vertical direction gradually resisting the limiting ring  2  when the limiting rod  1  has moved to the position touching the limiting ring  2 . When the limiting rod  1  moves beyond the vertical position, in the force of the adjusting spring  4 , the limiting rod  1  swing rapidly to the position where it touches the right side of the limiting sleeve  9 . At this time, the rotation of the limiting rod  1  will drive the rotation of the reversing positing block  10  to the right side, which tough with the limiting sleeve  9 . The rotation of the reversing positing block  10  will drive the rotation to the rear reversing rod  11  to the left side, with the rotation centered at the rear rotating axis  12 . The rotation of the rear reversing rod  11  will result in positive reversal of the spring sleeve  20 . With the force of the reversing spring  18 , the front reversing rod  25  rotates to the left side centered at the front rotating axis  24  and the reversing arm  40 , which is fixed at the top of the front reversing rod  25 , rotates at the same time, such that switching of intake of the left signal nozzle  42  and the right signal nozzle  43  is realized, and the stage of stepping to the right side switch into stepping to the left side is completed. 
         [0028]    The next stage is stepping to the left side when the limiting rod  1  and the reversing positing block  10  are positioned against right side of the limiting sleeve  9 . The rear reversing rod  11  rotates centered at the rear rotating axis  12  to the left limiting position and the front reversing rod  25  rotates centered at the front rotating axis  24  to the left limiting position. Meanwhile the right signal nozzle  43  intakes signal water, which enters through the right signal pipe  45 , then enters the left inlet tubule  38  and ultimately flows into the right parts of the jet element  27 . Part of the signal water in the jet element  27  is added into the main jet, meanwhile other parts stay in vortex region. When the water in the vortex region is accumulated to a critical volume, the pressure difference between the left and right cavities will push main jet to left side and make main jet curve. Finally, the main jet attaches the right wall and the sprinkler will begin stepping to the left side. Owing to the bending of main jet, the right signal nozzle  43  cannot intake signal water causing air to pass through the right signal nozzle  43 , then enter the right signal pipe  45 , and finally flowing into the left part through the left inlet tubule  38 . The sprinkler will jet straight when the pressure difference between left and right cavity is tiny. The sprinkler will step to the left side by switching stepping state and jet straight state repeatedly. 
         [0029]    The final stage is that of switching from stepping to the left side into stepping to the right side. The limiting rod  1  moves in the vertical direction gradually resisting the limiting ring  2  when the limiting rod  1  moves to the position touching with the limiting ring  2 . When the limiting rod  1  moves beyond the vertical position, with force of the adjusting spring  4 , the limiting rod  1  swing rapidly to the position touching with left side of the limiting sleeve  9 , at this time, rotation of the limiting rod  1  will drive the rotation of the reversing positing block  10  to the left side, which touch with the limiting sleeve  9 . Rotation of the reversing positing block  10  will drive the rotation of the rear reversing rod  11  to the right side centered at the rear rotating axis  12 . The rotation of the rear reversing rod  11  will result in positive reversing of the spring sleeve  20 . With the force of the reversing spring  18 , the front reversing rod  25  rotates to the right side centered at the front rotating axis  24 . The reversing arm  40  is fixed at the top of the front reversing rod  25  and rotates at the same time, such that switching of the intake of the left signal nozzle  42  and the right signal nozzle  43  is realized. The stage of stepping to the left side switching into stepping to the right side is thereby completed. 
         [0030]    In the description of the present specification, meaning of reference terms such as “an embodiment, ” “some embodiments,” “example,” “specific example,” “some examples” is that specific features, structures, materials or features of example or embodiment is included in one more example or embodiment of the present application. In the present specification, diagrammatic representations of the terms above have not been directed at the same examples or examples. Furthermore, the specific features, structures, materials, or characteristics of the description can be combined in any one or more embodiments or examples in a suitable manner. 
         [0031]    In addition, one of ordinary skill in the art can combine different embodiments or examples described in this specification. 
         [0032]    Although embodiment of the present application is described above, it is understandable that the embodiment is exemplary, could not be interpreted as the limiting to the application, ordinary technical staff in the field is able to change, modify, replace and distort within the scope of the present application