A water distribution structure and a sprinkler head suitable for low pressure uniform sprinkling

Abstract

The present application relates to a kind of water distribution structure and sprinkler suitable for low pressure uniform sprinkling irrigation, water distribution structure includes spray body and water distribution support, the jet of the outlet of spray body can successively impact different water distribution protrusions of water distribution support, and drive water distribution support reciprocating swing around the outlet axis of spray body, improve sprinkling irrigation uniformity, in the interval time of successively impacting water distribution protrusions, jet can not reduce sprinkling irrigation range without being affected by any water distribution structure, can give consideration to sprinkling irrigation uniformity and range under lower working pressure, sprinkler also includes the spray pipe provided with elastic element, the fluid pressure in the space flow passage of spray pipe and spray body can drive spray body relative to spray pipe rotation, and drive elastic element deformation extrusion spray body inner wall, at any pressure, sprinkler can rotate at constant speed, the air hole of spray body can also make gas and internal fluid mix at any time, improve the water distribution of sprinkler using two-phase flow principle and swing water distribution structure, improve sprinkling irrigation quality, meet the application requirement of low pressure uniform sprinkling irrigation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of sprinkler irrigation equipment, and particularly relates to a water dispersing structure and a sprinkler head suitable for low-pressure uniform sprinkler irrigation. BACKGROUND

[0002] Sprinkler irrigation is a kind of irrigation mode that water with a certain pressure is sprayed into the air through a sprinkler head and then scattered into small water droplets or mist to fall on plants and the ground by means of a water pump and a pipeline system or natural water head. It is widely used in the fields of agricultural irrigation and garden spraying. With the increasingly prominent global energy shortage, reducing the working pressure of the sprinkler head has become a development trend. However, after the working pressure of the sprinkler head is reduced, it will have an adverse effect on the range, water distribution and uniformity of the sprinkler.

[0003] At present, the method of combining a special-shaped spray body and a water dispersing mechanism is mainly used to overcome the adverse effect of the reduced pressure of the sprinkler head. However, the main defect of this method is that the existing low-pressure sprinkler head has two kinds of water dispersing mechanisms, namely a fixed type and a periodic type. The fixed type water dispersing mechanism includes a water dispersing disc or a water dispersing tooth which is fixed relative to the position of the spray body. The water is broken by the fluid impact on the water dispersing disc or the water dispersing tooth. The structure is simple, but the range is always sacrificed to improve the uniformity of the sprinkler head. The periodic type water dispersing mechanism includes a water dispersing disc or a water dispersing tooth which can rotate relative to the rotation shaft of the spray body. The water dispersing disc or the water dispersing tooth is impacted by the fluid from the vertical direction to make the flow channel curve surface of the water dispersing disc or the water dispersing tooth rotate periodically to form a periodic water dispersing effect. Compared with the fixed type water dispersing mechanism, the periodic type water dispersing mechanism can take into account the range and the uniformity of the sprinkler head. However, the working pressure of the sprinkler head can only be reduced by about 50 kPa. If the working pressure of the sprinkler head is further reduced, the periodic type water dispersing mechanism will fail to rotate, the breaking degree of the jet flow will be reduced, and the hydraulic performance of the sprinkler head will be sharply decreased, which cannot meet the application requirements of low-pressure uniform sprinkler irrigation.

[0004] Secondly, the water dispersing influence range of the water dispersing disc with a single flow channel or the water dispersing tooth with a single structure on the range area is limited, which cannot meet the uniformity requirements of the water distribution of the sprinkler irrigation in the whole range area.

[0005] In addition, the rotation speed of the sprinkler head has a huge impact on its hydraulic performance. High rotation speed will reduce the range of the sprinkler head and increase the initial investment of the sprinkler head. At present, the rotation speed control of the sprinkler head has always been a big problem. Some rotating sprinkler heads use a damping structure matched with the rotation shaft of the sprinkler head to control the rotation speed of the sprinkler head by the viscosity of the damping grease in the damping structure. However, the upper limit of the damping grease is limited after the sprinkler head is assembled. When the working pressure is high, the rotation speed of the sprinkler head is increased, but the damping grease cannot completely reduce the rotation speed of the sprinkler head. At the same time, the temperature rise of the sprinkler head during long-time work will cause the viscosity of the damping grease to decrease, further reducing the damping effect, and thus causing the range of the sprinkler head to sharply decrease. Most of the sprinkler heads do not consider the rotation speed of the sprinkler head, which causes the range of the sprinkler head to be only about 5-8 m during operation. The higher the working pressure is, the lower the range is, which affects the quality of the sprinkler irrigation. SUMMARY

[0006] The present application aims to solve at least one of the above technical problems, and provides a water distribution structure and a sprinkler head suitable for low-pressure uniform sprinkling, which can balance the uniformity and range of sprinkling under lower working pressure, and can rotate at a uniform speed under any pressure to improve the quality of sprinkling.

[0007] The technical scheme adopted by the present application to solve the technical problems is:

[0008] A water distribution structure suitable for low-pressure uniform sprinkling, comprising a spray body, a water distribution support movably connected with the spray body, and a plurality of water distribution protrusions located in front of the outlet of the spray body and arranged at intervals around the water distribution support, wherein the outlet jet of the spray body can successively hit different water distribution protrusions and drive the water distribution support to reciprocally swing around the outlet axis of the spray body, and the distance between the first and second water distribution protrusions is greater than the width of the outlet jet on the cross section of the first and second water distribution protrusions.

[0009] Further, the spray body is provided with a ring groove, the water distribution support is limitingly arranged in the ring groove, at least one water distribution protrusion is provided with an inclined surface inclined to the direction of the outlet jet of the spray body, and the outlet jet of the spray body can hit the inclined surface to drive the water distribution support to rotate around the outlet axis of the spray body.

[0010] Further, the water distribution support is provided with a plurality of water distribution protrusions with different impact areas when the outlet jet of the spray body hits the deepest.

[0011] Further, the plurality of water distribution protrusions include needle-shaped water distribution protrusions, boss-shaped water distribution protrusions and wedge-shaped water distribution protrusions, the diameter of the needle-shaped water distribution protrusions and the diameter of the boss-shaped water distribution protrusions are 0.4-0.6 times the diameter of the outlet jet of the spray body, and the impact areas of the needle-shaped water distribution protrusions, the boss-shaped water distribution protrusions and the wedge-shaped water distribution protrusions increase in turn when the outlet jet of the spray body hits the deepest.

[0012] A sprinkler head suitable for low-pressure uniform sprinkling, comprising a spray pipe and the water distribution structure according to any one of the above, wherein the spray pipe is provided with an elastic member, the spray pipe is in communication with a space flow channel in the spray body, the fluid pressure in the space flow channel can drive the spray body to rotate relative to the spray pipe, and the elastic member can be deformed to press the inner wall of the spray body.

[0013] Further, the spray pipe is sealingly connected with the spray body in rotation, a cylindrical roller bearing is arranged between the spray pipe and the spray body, the center points of the cross sections in the middle of the space flow channel in the spray body gradually deviate from the inlet to the outlet, and the deviation is uniform.

[0014] Further, the inlet flow area of the spray body is greater than the outlet flow area.

[0015] Further, the nozzle is provided with a water baffle, the water baffle is provided with a notch provided with an elastic element, a gap is formed between the notch and the elastic element, the nozzle body is provided with an air hole below the elastic element, the air hole can communicate with the space flow channel of the nozzle and the nozzle body, and the flow area of the space flow channel gradually decreases from the inlet to the outlet of the nozzle body.

[0016] Further, the elastic element comprises a plurality of metal elastic sheets arranged at intervals around the nozzle body, and the metal elastic sheets are provided with upwardly protruding arc-shaped portions.

[0017] Further, the nozzle is provided with a shaft shoulder and a water baffle, a plurality of notches are arranged on the water baffle, one end of each of the plurality of metal elastic sheets is limited between the shaft shoulder and the water baffle, the other end of each of the plurality of metal elastic sheets extends into the corresponding notch, the metal elastic sheet and the notch are in gap cooperation, and the metal elastic sheet and the shaft shoulder are in sliding cooperation.

[0018] Compared with the prior art, the beneficial effects of the present application are:

[0019] (1) When the water scattering structure utilizes the outlet jet flow of the nozzle body to successively impact different water scattering protrusions and drive the water scattering support to reciprocally swing around the outlet axis of the nozzle body, the water scattering effect of the impact on the water scattering protrusions can improve the uniformity of sprinkling irrigation, the jet flow is not affected by any water scattering structure during the interval time of successively impacting the water scattering protrusions, the jet flow can not be reduced in range, and the resistance is smaller, so that the sprinkling irrigation can be operated at a lower working pressure, the uniformity of sprinkling irrigation and the range are considered, the problem that the jet flow breaking degree is weakened and the hydraulic performance is sharply decreased due to pressure reduction in the prior art is solved, and the application demand of low-pressure uniform sprinkling irrigation is met.

[0020] (2) The water scattering structure utilizes the outlet jet flow of the nozzle body to impact the inclined surface to drive the water scattering support to rotate around the outlet axis of the nozzle body, to form a swing and rotation compound motion, and to change the impact area when the water scattering protrusion is inserted into the outlet jet flow of the nozzle body to the deepest, so as to change the influence of the water scattering protrusion on the jet flow velocity, and to further improve the water distribution uniformity of sprinkling irrigation in the whole range.

[0021] (3) When the nozzle utilizes the fluid pressure in the space flow channel to drive the nozzle body to rotate relative to the nozzle, the elastic element is deformed to press the inner wall of the nozzle body to form a friction resistance, so that the working pressure, the rotation driving force of the nozzle body and the friction resistance are all positively correlated, the rotation speed of the nozzle is kept constant at different working pressures, the problem that the rotation speed of the nozzle is greatly affected by the working pressure, the higher the working pressure of the nozzle, the faster the rotation speed, and the smaller the range are solved, and the performance of the nozzle is stable.

[0022] (4) The air hole of the nozzle can not only discharge the water leakage from the gap between the elastic element and the water baffle to spray the water near the position of the nozzle stand, but also can make the gas mixed with the fluid in the nozzle body at any time, so as to further improve the water distribution of the nozzle by utilizing the two-phase flow principle, so that the nozzle has good sprinkling irrigation quality at a lower working pressure.

[0023] (5) The whole structure is simple, easy to disassemble and assemble, and convenient for popularization and application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0025] Figure 1 is a structural schematic diagram of embodiment 1 of the present application;

[0026] Figure 2 is a rocking schematic diagram of embodiment 1 of the present application;

[0027] Figure 3 is a needle-shaped water dispersing protrusion structure schematic diagram of embodiment 1 of the present application;

[0028] Figure 4 is a boss-shaped water dispersing protrusion structure schematic diagram of embodiment 1 of the present application;

[0029] Figure 5 is a wedge-shaped water dispersing protrusion structure schematic diagram of embodiment 1 of the present application;

[0030] Figure 6 is a structural schematic diagram of embodiment 2 of the present application;

[0031] Figure 7 is a schematic diagram of the installation of a nozzle and an elastic member of embodiment 2 of the present application;

[0032] Figure 8 is a nozzle structure schematic diagram of embodiment 2 of the present application;

[0033] Figure 9 is a cylindrical roller bearing structure schematic diagram of embodiment 2 of the present application;

[0034] Figure 10 is a space flow channel structure parameter schematic diagram of embodiment 2 of the present application;

[0035] Figure 11 is an elastic member structure schematic diagram of embodiment 2 of the present application;

[0036] Figure 12 is a water baffle structure schematic diagram of embodiment 2 of the present application;

[0037] Markings in the figure: stand 1, nozzle 2, section 201, internal thread 202, nozzle outlet 203, shaft shoulder 204;

[0038] O-ring 3, cylindrical roller bearing 4, through hole 401, threaded hole 402, lower end surface 403, rotating outer wall surface 404, water baffle 5, notch 501, outer diameter of water baffle 502, ring plate 503, fan-shaped plate 504, nut 6;

[0039] Spray body 7, outlet space flow passage cross section 701, inlet space flow passage cross section 702, air hole 703, annular groove 704;

[0040] Water dispersing support 8, boss type water dispersing protrusion 801, diameter of boss type water dispersing protrusion 8011, vertical height from boss center to boss bottom 8012, taper angle of boss type water dispersing protrusion 8013, needle type water dispersing protrusion 802, diameter of needle type water dispersing protrusion 8021, taper angle of needle type water dispersing protrusion 8022, wedge type water dispersing protrusion 803, bevel angle 8031, swing angle θ1, locking nut 9;

[0041] Metallic elastic sheet 10, thickness of metallic elastic sheet 101, width of metallic elastic sheet 102, arch-shaped part 103, outer diameter of metallic elastic sheet 104, cylindrical hole 105;

[0042] Sealing plate 11, radial gap 12, axial gap 13, distance d1 between water dispersing protrusions in sequence, outlet jet width d2 on water dispersing protrusion cross section. DETAILED DESCRIPTION

[0043] Embodiments of the present application are described in detail below with reference to examples illustrated in the accompanying drawings, in which the same or similar components or components having the same or similar functions are denoted by the same or similar reference numerals throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" or "several" is two or more, unless otherwise explicitly and specifically limited.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] Embodiment 1:

[0047] As Figures 1-5 shown, it is a preferred embodiment of the water distribution structure suitable for low-pressure uniform sprinkling irrigation according to the present application, the water distribution structure comprises a spray body 7, a water distribution support 8 movably connected with the spray body 7, and a plurality of water distribution protrusions located in front of the outlet of the spray body 7 are arranged at intervals around the water distribution support 8, the outlet jet of the spray body 7 can successively hit different water distribution protrusions, and drive the water distribution support 8 to reciprocally swing around the outlet axis of the spray body 7, the distance d1 between the successive water distribution protrusions is greater than the outlet jet width d2 on the cross section of the successive water distribution protrusions.

[0048] The swing working principle of the above-mentioned water distribution structure comprises:

[0049] Under natural conditions, the water distribution support 8 is inclined downward under the action of gravity so that a certain water distribution protrusion is located on the outlet jet path in front of the outlet of the spray body 7; when the spray body 7 is working, the outlet jet of the spray body 7 will first hit this water distribution protrusion, and a large number of water droplets are generated by the broken water, and the water distribution structure affected by the jet is pushed by the jet, driving the water distribution support 8 to swing around the outlet axis of the spray body 7 in the force direction of this water distribution protrusion.

[0050] After swinging, due to the inertia effect, the water distribution support 8 will continue to run in the swing direction for a period of time, and during this period of time, since the distance d1 between the successive water distribution protrusions is greater than the outlet jet width d2 on the cross section of the successive water distribution protrusions, the jet sprayed from the spray body 7 is not affected by any water distribution structure, so that the range of the spray body 7 reaches the maximum.

[0051] When the water distribution support 8 continues to swing under inertia, one of the remaining water distribution protrusions will gradually collide with the jet, a large number of water droplets are generated by the broken water, and the sprinkling irrigation effect is improved, and at the same time, the water distribution protrusion is also pushed by the jet, driving the water distribution support 8 to swing around the outlet axis of the spray body 7 in the force direction of this water distribution protrusion, i.e. reverse swing.

[0052] Such continuous reciprocation, reciprocating swing through the impact of a certain water projection, not to hit any water projection, impact another water projection, fixed water structure can improve the irrigation uniformity, but also can not reduce the range, the existing cycle water structure without overcoming the friction force when the rotation of the spray body 7 shaft, can run at a lower working pressure, solve the existing due to the problem of reduced pressure caused by the weakening of the jet flow and the sharp decline in hydraulic performance.

[0053] Further, the swing angle θ1 of the water projection support 8 is preferably 8-10°, which facilitates further consideration of swing frequency, range, and water projection uniformity.

[0054] Further, the spray body 7 is provided with a ring groove 704, the water projection support 8 is limited to be arranged in the ring groove 704, at least one water projection is provided with an inclined surface inclined to the outlet jet direction of the spray body 7, the outlet jet of the spray body 7 can impact the inclined surface to drive the water projection support 8 to rotate around the outlet axis of the spray body 7, and the swing and rotation are combined, which facilitates further consideration of swing frequency, range, and water projection uniformity, and at the same time, the friction resistance when the existing cycle water structure and the rotation shaft of the spray body 7 rotate is smaller, which can reduce the influence of pressure reduction on the hydraulic performance of the nozzle.

[0055] Further, the inclined surface angle 8031 is preferably 40-60°, which facilitates further making the jet provide a tangential force for the circumferential rotation of the water projection support 8.

[0056] Further, the ring groove 704 is open to the outlet end of the spray body 7, the outlet end of the spray body 7 is connected with a locking nut 9, the water projection support 8 is sleeved in the ring groove 704, the water projection support 8 is limited to cooperate with the locking nut 9 and the ring groove 704 respectively at front and back, the water projection support 8 and the spray body 7 are provided with a gap in the radial direction, preferably 1mm, and the water projection support 8 and the spray body 7 are provided with a gap in the axial direction, preferably 4.5-5.5mm, which further facilitates the quick installation of the water projection support 8 and enables the water projection support 8 to swing and rotate around the outlet axis of the spray body 7.

[0057] Further, the water projection support 8 is provided with a plurality of water projection supports with different impact areas when the outlet jet of the spray body 7 impacts the deepest, which can change the influence of the water projection on the jet velocity, further meeting the demand for water distribution uniformity in the full range of sprinkling irrigation.

[0058] Furthermore, the several water-spreading protrusions include needle-shaped water-spreading protrusions 802, boss-shaped water-spreading protrusions 801, and wedge-shaped water-spreading protrusions 803. The diameter 8021 of the needle-shaped water-spreading protrusion and the diameter 8011 of the boss-shaped water-spreading protrusion are 0.4-0.6 times the diameter of the outlet jet of the nozzle 7, so as to ensure that the water flow passes through both sides of the water-spreading protrusion and replenishes the water volume in the middle of the range. When the needle-shaped water-spreading protrusion 802, boss-shaped water-spreading protrusion 801, and wedge-shaped water-spreading protrusion 803 are inserted to the deepest point of the outlet jet of the nozzle 7, the impact area increases sequentially.

[0059] Furthermore, the cone angle 8022 of the needle-shaped water-spraying protrusion is preferably 60°, which further facilitates the replenishment of water in the area between the middle position of the range and the far position of the range.

[0060] Furthermore, the cone angle 8013 of the protruding water-spreading protrusion is preferably 60°, and the vertical height 8012 from the center of the protrusion to the bottom of the protrusion is 2 / 3 times the height of a cone with the same parameters. Limiting the height of the protrusion further helps to prevent the water flow from being excessively dispersed and the water volume near the spray body 7 from being excessively increased.

[0061] The working principle of the above-mentioned water distribution structure to further improve water distribution includes:

[0062] After the water flow is sprayed into the air from the nozzle 7, it will impact the needle-shaped water distribution protrusion 802, the boss-shaped water distribution protrusion 801, and the wedge-shaped water distribution protrusion 803. As the impact area increases sequentially, when the water flow impacts the needle-shaped water distribution protrusion 802, it mainly replenishes the water volume in the area between the middle and far ends of the range; when the water flow impacts the boss-shaped water distribution protrusion 801, it mainly replenishes the water volume in the area between the near and middle ends of the range; when the water flow impacts the wedge-shaped water distribution protrusion 803, it mainly replenishes the water volume in the near end of the range, while providing driving force for the water distribution support 8 to rotate. After the water distribution structure has been working for a period of time, there will be water flow from these three different types of water distribution protrusions at every position in the spray area, thereby improving the water distribution of the nozzle 7 and increasing the degree of jet fragmentation without reducing the range of the nozzle.

[0063] Example 2:

[0064] like Figures 6-12 As shown, this is a preferred embodiment of a sprinkler head suitable for low-pressure uniform irrigation according to the present invention. The sprinkler head includes a nozzle 2 and a water distribution structure as described in Example 1. The nozzle 2 is provided with an elastic element. The nozzle 2 is connected to the spatial flow channel inside the spray body 7. The fluid pressure in the spatial flow channel can drive the spray body 7 to rotate relative to the nozzle 2 and drive the elastic element to deform and squeeze the inner wall of the spray body 7.

[0065] The principle behind the constant rotation speed of the above-mentioned nozzles includes:

[0066] In the process of spraying, the fluid flows along the space flow channel of the spray pipe 2 and the spray body 7 and is sprayed out. When the fluid pressure in the space flow channel drives the spray body 7 to rotate relative to the spray pipe 2, the fluid pressure in the space flow channel can act on the elastic member to drive the elastic member to deform and press the inner wall of the spray body 7. The higher the working pressure is, the greater the flow entering the spray head is, and the stronger the metal spring 10 is affected by the water flow is. Finally, the frictional resistance between the metal spring 10 and the spray body 7 is greater. At the same time, the greater the flow is, the greater the driving force provided for the spray body 7 is. The rotation speed of the spray head remains constant under different working pressures, solving the problem that the rotation speed of the existing spray head is greatly affected by the working pressure, and the higher the working pressure of the spray head is, the faster the rotation speed is, resulting in a smaller range. Thus, the performance of the spray head is stable.

[0067] Further, the vertical rod 1 with the space flow channel is provided. Figures 6-8 As shown, the spray pipe 2 is provided with a tangent plane 201. After the spray pipe 2 is limited to rotate by cooperating with the tangent plane 201 by a tool, the lower part of the spray pipe 2 is connected with the vertical rod 1 through the internal thread 202. The internal thread 202 conforms to the GB / T 1167-1996 standard. The vertical rod 1 can be used as a water supply pipeline of the sprinkling irrigation system, further facilitating the installation of the spray head.

[0068] Further, the spray pipe 2 is sealingly and rotatably connected with the spray body 7. The cylindrical roller bearing 4 is arranged between the spray pipe 2 and the spray body 7. From the inlet to the outlet of the spray body 7, the center points of the cross sections in the middle of the space flow channel in the spray body 7 are gradually offset, uniformly and gradually, so that the fluid jet can drive the spray body 7 to rotate relative to the spray head after the fluid jet acts on the space flow channel. The cylindrical roller bearing 4 reduces the frictional resistance when rotating, further reducing the working pressure of the spray head to a greater extent than the existing low-pressure spray head, achieving the effect of further energy saving.

[0069] Further, the upper part of the spray pipe 2 is provided with the shaft shoulder 204. After the cylindrical roller bearing 4 is sleeved on the outside of the spray pipe 2, the cylindrical roller bearing 4 can be in contact with the shaft shoulder 204 for limiting and quickly positioning. The cylindrical roller bearing 4 is in interference fit with the spray pipe 2, playing a sealing role. As shown, Figure 9 two M3x 2 threaded holes 402 are drilled at a position 15-20 mm away from the lower end surface 403 of the outer wall surface of the cylindrical roller bearing 4, which are perpendicular to each other and are used to be connected with the spray body 7. Two M3 through holes 401 are drilled at a position 4-6 mm away from the lower end surface 403 of the outer wall surface of the cylindrical roller bearing 4, which are perpendicular to each other and are used to be connected with the spray pipe 2. The spray pipe outlet 203 conforms to the GB / T 22999-2008 standard, further facilitating the sealing installation.

[0070] Further, the rotating outer wall surface 404 of the cylindrical roller bearing 4 is connected with the sealing plate 11 by a fastening screw. The sealing plate 11 is connected with the spray body 7 through a threaded hole, further facilitating the sealing and rotating connection between the spray pipe 2 and the spray body 7.

[0071] Further, there is an O-shaped sealing ring 3 between the sealing plate 11 and the cylindrical roller bearing 4, the cross-sectional diameter of the O-shaped sealing ring 3 is preferably 2.4 mm, and the inner diameter of the O-shaped sealing ring 3 is 2-3 mm smaller than the outer diameter of the cylindrical roller bearing 4, which is used to further seal the gap between the sealing plate 11 and the cylindrical roller bearing 4 and prevent leakage.

[0072] Further, the angle θ2 between the line connecting the center point of the inlet space flow passage cross section 702 of the spray body 7 and the center point of the outlet 203 of the nozzle and the line connecting the center point of the outlet space flow passage cross section 701 and the center point of the outlet 203 of the nozzle is preferably 5-8°, which provides the circumferential force for the spray body 7 to rotate under the effect of the wall attachment and further controls the rotational speed.

[0073] Further, the force F1 of the fluid in the space flow passage on the wall surface of the spray body 7 is the rotational driving force of the space flow passage, and the inlet flow area of the spray body 7 is larger than the outlet flow area, so that part of the water flow cannot be discharged in time through the outlet of the spray body 7, and part of the water flow will flow to the elastic member through the gap between the spray body 7 and the nozzle 2 and extrude the elastic member to deform and elongate.

[0074] The size of the space flow passage rotational driving force F1 mainly depends on the shape and size of the space flow passage, the incident angle and direction, as shown in the figure. Figure 10 As shown in the figure, the xyz three-dimensional coordinate system is established with the center of the inlet cross section of the spray body 7 as the origin, and according to the momentum theorem, the projection of F1 on the x, y and z axes is equal to the projection of the momentum change on this axis per unit time.

[0075] By studying the relationship between the working pressure and the driving force and the frictional resistance, and then adjusting the structure and size of the elastic member according to their relationship, the frictional resistance and the circumferential force can be further balanced, and the rotational speed can be kept constant.

[0076] Further, the area ratio of the inlet cross section of the spray body 7 to the outlet cross section of the spray body 7 is preferably 4:1, and the space flow passage cross section of the spray body 7 is circular or special-shaped, which is further beneficial to the part of the jet flow from the nozzle 2 impacting the elastic member through the gap between the spray body 7 and the nozzle 2.

[0077] Further, the nozzle 2 is provided with a water baffle 5, the water baffle 5 is provided with a notch 501 for arranging the elastic member, a gap is arranged between the notch 501 and the elastic member, the gap width is preferably 0.2-0.3 mm, the spray body 7 is provided with an air hole 703 located below the elastic member, the diameter of the air hole 703 is preferably 2 mm, the air hole 703 can communicate with the space flow passage of the nozzle 2 and the spray body 7, and the flow area of the space flow passage gradually decreases from the inlet to the outlet of the spray body 7.

[0078] The air hole 703 can not only discharge the water leaking from the gap between the elastic member and the water baffle 5, but also spray the water near the position of the stand 1 of the nozzle. During the normal operation of the nozzle, the tapered structure of the space flow channel of the spray body 7 increases the flow velocity of the water flow, and causes the pressure in the spray body 7 to decrease. When the pressure in the spray body 7 is less than the atmospheric pressure, the gas outside the nozzle can enter the space flow channel through the gap between the notch 501 and the elastic member, so that the gas is mixed with the fluid in the spray body 7 from time to time, improves the turbulent flow ability of the fluid, increases the breaking degree of the jet, further increases the breaking degree of the jet, and finally improves the water distribution of the nozzle and increases the spraying uniformity of the nozzle.

[0079] Further, as shown in Figure 11 The elastic member includes a plurality of metal elastic sheets 10 arranged at intervals around the spray body 7. The metal elastic sheet 10 is provided with an upwardly protruding arched portion 103. Part of the water flow will flow to the metal elastic sheet 10 through the gap between the spray body 7 and the spray pipe 2, and extrude the arched portion 103 to make the metal elastic sheet 10 deform and elongate as a whole. In the process of elongation, the inner wall of the spray body 7 is extruded, and the frictional resistance between the metal elastic sheet 10 and the spray body 7 is increased.

[0080] According to the principle of fluid dynamics, the dynamic pressure generated by the fluid on the upper part of the arched portion 103 of the metal elastic sheet 10 can be calculated as the impact force F c , which can be expressed as:

[0081]

[0082] In the above formula, v is the velocity of the fluid impacting on the arched portion 103; p is the density of the fluid; A c is the area of the arched portion 103 of the metal elastic sheet 10 impacted by the fluid, m 2 .

[0083] After the metal elastic sheet 10 is impacted by the fluid, the arched portion 103 will deform under pressure, so that the other side of the metal elastic sheet 10 elongates. Therefore, the strain and stress distribution of the metal elastic sheet 10 can be calculated by using the approximate form of the catenary.

[0084] Further, when the end of the metal elastic sheet 10 elongates, it will extrude the inner wall of the spray body 7. The relationship between the working pressure and the driving force and the frictional resistance can be obtained by research, and then the structure size of the metal elastic sheet 10 can be adjusted according to the relationship between them, so as to further balance the frictional resistance and the circumferential force, and keep the rotational speed constant.

[0085] Further, the thickness 101 of the metal elastic sheet is 0.05-0.07 mm, the width is 3 mm, the material is 301 stainless steel, the outer diameter 104 of the metal elastic sheet is consistent with the maximum inner diameter of the spray body 7, the highest point of the arch-shaped part 103 is between 0.3-0.5 mm from the minimum vertical distance of the spray body 7, and further makes the metal elastic sheet 10 easily elastically deformed under the action of the body impact.

[0086] Further, the maximum thickness of the arch-shaped part 103 is 0.05 mm, and the length of the arch-shaped part 103 accounts for 1 / 2-2 / 3 of the length of the entire metal elastic sheet 10, which further makes the water flow impact on the arch-shaped structure as much as possible, so that the metal elastic sheet 10 is stretched.

[0087] Further, the spray pipe 2 is provided with a shaft shoulder 204 and a water baffle 5, the water baffle 5 is provided with a plurality of notches 501, a plurality of metal elastic sheets 10 are connected at one end and can be positioned between the shaft shoulder 204 and the water baffle 5, and the other ends of the plurality of metal elastic sheets 10 respectively extend into the plurality of notches 501, the other end of the metal elastic sheet 10 is preferably an L-shaped structure in cross section for increasing the frictional resistance, the metal elastic sheet 10 and the notch 501 are clearance fitted, so that the metal elastic sheet 10 can freely stretch under the action of the fluid, the metal elastic sheet 10 and the shaft shoulder 204 are slidingly fitted, and the length of the shaft shoulder 204 is preferably 5-8 mm, which further facilitates the horizontal expansion and contraction of the metal elastic sheet 10.

[0088] Further, one end of the plurality of metal elastic sheets 10 is connected and provided with a cylindrical hole 105, the cylindrical hole 105 is clearance fitted with the outer wall of the spray pipe 2, as shown in Figure 12 The water baffle 5 includes a ring plate 503 sleeved outside the spray pipe 2, a plurality of fan-shaped plates 504 are arranged around the ring plate 503, the ring plate 503 is provided with a nut 6 threadedly connected with the spray pipe 2, so that the notches 501 are formed between adjacent fan-shaped plates 504, the outer diameter 502 of the water baffle is consistent with the outer diameter 104 of the metal elastic sheet, which further facilitates the disassembly and assembly of the metal elastic sheet 10.

[0089] The assembly process of the above-mentioned spray head includes:

[0090] Firstly, the cylindrical hole 105 of the metal elastic sheet 10 is sleeved outside the spray pipe 2 from above the spray pipe 2 and is in parallel contact with the shaft shoulder 204 at the upper part of the spray pipe 2 for limiting;

[0091] Secondly, the water baffle 5 is sleeved outside the spray pipe 2 from above the spray pipe 2 and is pressed against one end of the metal elastic sheet 10, while ensuring that the other ends of the plurality of metal elastic sheets 10 extend into the notches 501 of the water baffle 5, and the two sides of the metal elastic sheet 10 do not contact the side walls of the notches 501 of the water baffle 5;

[0092] Thirdly, the water baffle 5 and the metal elastic sheet 10 are locked on the spray pipe 2 through the threaded cooperation of the locking nut 9 and the spray pipe 2.

[0093] Fourthly, the spray pipe 2 with the metal spring 10 and the water baffle 5 is put into the lower part of the spray body 7;

[0094] Fifthly, the cylindrical roller bearing 4 is installed on the spray pipe 2, and the cylindrical roller bearing 4 is pressed against the shaft shoulder 204 of the spray pipe 2, and then the cylindrical roller bearing 4 is fixed to the spray pipe 2 by screws;

[0095] Sixthly, the sealing plate 11 is fixed to the rotating outer wall surface 404 of the cylindrical roller bearing 4 through screw holes;

[0096] Seventhly, the sealing plate 11 is connected to the spray body 7 through screw holes, so that the spray pipe 2 is sealingly connected to the spray body 7 in rotation, and the spray pipe 2 is connected to the space flow channel in the spray body 7;

[0097] Eighthly, the water dispersing support 8 is passed through the outlet end of the spray body 7 and located in the annular groove 704, and the locking nut 9 is screwed on the outlet end of the spray body 7;

[0098] Ninthly, the spray pipe 2 is connected to the vertical pipe through threads, and the vertical pipe is connected to the water supply pipeline of the sprinkling irrigation system to realize overall assembly.

[0099] The working principle of the above-mentioned sprinkler includes:

[0100] During operation, the water flow is delivered to the spray pipe 2 through the vertical rod 1, and then sprayed into the air through the space flow channel of the spray body 7. During the spraying process, the frictional resistance applied to the spray body 7 by the metal spring 10 and the driving force applied to the spray body 7 by the water flow jointly act on the spray body 7, so that the spray head can rotate at a constant speed relative to the spray pipe 2, preventing the influence of the rotation speed on the spraying quality. The air hole 703 and the swing type water dispersing structure jointly act on the water flow, which utilizes the two-phase flow principle and the impinging jet principle, so that the sprinkler can have good sprinkling irrigation quality at a relatively low working pressure. Therefore, the sprinkler can not only greatly reduce the working pressure of the sprinkler, but also can realize uniform rotation of the sprinkler at any pressure, and can ensure the sprinkling irrigation quality of the sprinkler at a low pressure, solving the problems that the reduction range of the working pressure of the sprinkler is small and the rotation speed of the sprinkler cannot be effectively controlled.

[0101] The above series of detailed descriptions are only specific descriptions of the feasible embodiments of the present application, and they are not used to limit the protection scope of the present application. Any equivalent embodiments or changes made without departing from the spirit of the present application should be included in the protection scope of the present application.

Claims

1. A water dispersing structure suitable for low pressure uniform sprinkling irrigation, characterized in that, The invention discloses a water dispersing structure, which comprises a spray body (7), a water dispersing support (8) movably connected with the spray body (7), and a plurality of water dispersing protrusions arranged around the water dispersing support (8) and located in front of the outlet of the spray body (7). The outlet jet of the spray body (7) can hit different water dispersing protrusions in sequence and drive the water dispersing support (8) to reciprocate around the outlet axis of the spray body (7). The distance d1 between the first and the second water dispersing protrusions is greater than the outlet jet width d2 on the cross section of the first and the second water dispersing protrusions. The spray body (7) is provided with a ring groove (704), and the water dispersing support (8) is limitedly arranged in the ring groove (704). At least one water dispersing protrusion is provided with an inclined surface which is inclined to the direction of the outlet jet of the spray body (7). The outlet jet of the spray body (7) can hit the inclined surface and drive the water dispersing support (8) to rotate around the outlet axis of the spray body (7). The water dispersing support (8) is provided with a plurality of water dispersing protrusions which have different impact areas when the outlet jet of the spray body (7) hits the water dispersing protrusions.

2. A water distribution structure suitable for low pressure uniform sprinkling according to claim 1, wherein, The plurality of water dispersing protrusions comprise needle-shaped water dispersing protrusions (802), boss-shaped water dispersing protrusions (801) and wedge-shaped water dispersing protrusions (803). The diameter (8021) of the needle-shaped water dispersing protrusions and the diameter (8011) of the boss-shaped water dispersing protrusions are 0.4-0.6 times of the diameter of the outlet jet of the spray body (7). When the outlet jet of the spray body (7) hits the needle-shaped water dispersing protrusions (802), the boss-shaped water dispersing protrusions (801) and the wedge-shaped water dispersing protrusions (803) in sequence, the impact areas of the water dispersing protrusions increase in sequence.

3. A sprinkler suitable for low pressure uniform sprinkling, characterized in that The water dispersing structure comprises a spray pipe (2) and the water dispersing structure as claimed in claim 1. The spray pipe (2) is provided with an elastic element. The spray pipe (2) is in communication with a space flow channel in the spray body (7). The fluid pressure in the space flow channel can drive the spray body (7) to rotate relative to the spray pipe (2) and drive the elastic element to deform and press the inner wall of the spray body (7).

4. A sprinkler suitable for low pressure uniform sprinkling according to claim 3, wherein, The spray pipe (2) is sealingly connected with the spray body (7). A cylindrical roller bearing (4) is arranged between the spray pipe (2) and the spray body (7). From the inlet to the outlet of the spray body (7), the center points of the intermediate cross sections of the space flow channel in the spray body (7) are gradually offset and uniformly distributed.

5. A sprinkler suitable for low pressure uniform sprinkling according to claim 3, wherein, The inlet flow area of the spray body (7) is greater than the outlet flow area.

6. A sprinkler suitable for low pressure uniform sprinkling according to claim 3, wherein, The spray pipe (2) is provided with a water baffle (5). The water baffle (5) is provided with a notch (501) in which the elastic element is arranged. A gap is arranged between the notch (501) and the elastic element. The spray body (7) is provided with an air hole (703) below the elastic element. The air hole (703) can be in communication with the spray pipe (2) and the space flow channel of the spray body (7). From the inlet to the outlet of the spray body (7), the flow area of the space flow channel gradually decreases.

7. A sprinkler suitable for low pressure uniform sprinkling according to any one of claims 3 to 6, wherein The elastic element comprises a plurality of metal elastic sheets (10) which are arranged around the spray body (7) at intervals. The metal elastic sheet (10) is provided with an upwardly protruding arched portion (103).

8. A sprinkler suitable for low pressure uniform sprinkling according to claim 7, wherein, The nozzle (2) is provided with a shaft shoulder (204) and a water baffle (5), the water baffle (5) is provided with a plurality of notches (501), a plurality of metal elastic sheets (10) are limitedly arranged between the shaft shoulder (204) and the water baffle (5), the other ends of the plurality of metal elastic sheets (10) extend into the plurality of notches (501) respectively, the metal elastic sheet (10) and the notch (501) are in clearance fit, and the metal elastic sheet (10) and the shaft shoulder (204) are in sliding fit.

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