A spray head riser waterway fitting

Abstract

The application provides a nozzle vertical pipe water passing pipe fitting, which aims at solving the technical problems of different spray ranges and low spraying uniformity. The pipe fitting comprises a shell and a pressure response unlocking mechanism, the shell is provided with a water inlet end, a water outlet end and a water passing cavity, the inner wall of the water passing cavity is provided with an axial sliding groove and a spiral guide sliding groove, the water passing cavity is provided with an opening and closing mechanism, the opening and closing mechanism comprises a movable ring, a guide ring, a guide block and a plurality of opening and closing blades, the movable ring is matched with the axial sliding groove through a limiting sliding block, the guide ring is rotationally connected to the movable ring, the guide block is fixed to the guide ring and is matched with the guide sliding groove in sliding mode, the plurality of opening and closing blades are enclosed to form a variable water passing port, and the guide ring is transmissionally matched with the opening and closing blades. The movable ring is limited or released through the pressure response unlocking mechanism, the pipe fitting can automatically control on-off according to water supply pressure, water is supplied to the nozzle under stable pressure, and spraying range consistency and irrigation uniformity are improved.

Description

Technical Field

[0001] This invention relates to the field of pipelines, and in particular to a water passage pipe fitting for a sprinkler head riser. Background Technology

[0002] Sprinkler irrigation is a commonly used water-saving irrigation method in agriculture. It typically involves pressurizing irrigation water with a pump, then delivering it through main pipes, branch pipes, and risers to the sprinklers, which then spray the water onto the crop planting area. Sprinklers usually need to reach a certain rated working pressure to achieve optimal spray range, atomization effect, and spray uniformity. Only when the water supply pressure is relatively stable and meets the sprinkler's operating requirements can a relatively ideal spray range, atomization effect, and spray uniformity be achieved.

[0003] Commonly used fittings in existing sprinkler irrigation pipelines mainly include elbows, straight connectors, tees, crosses, plugs, and ordinary connecting joints. Their main function is to redirect, distribute, extend, or seal water flow. These fittings typically only have a single connection or flow guiding function and cannot automatically switch on / off states based on water supply pressure. When there is water flow in the pipeline but the water supply pressure is insufficient or unstable, the sprinkler head may still spray water at low pressure, resulting in insufficient spray range, poor water droplet atomization, and unstable spray area, which can easily lead to problems such as missed sprays, oversprays, or uneven irrigation. To solve the problem of sprinkler head water supply on / off control, existing technologies usually require the additional installation of manual valves, electric valves, or other control valve products in the pipeline. However, adding additional valves increases the structural complexity, installation cost, and maintenance cost of the sprinkler irrigation system; manual valves require manual operation and have a low degree of automation; electric valves require a power supply and control system, resulting in higher operating costs and inconvenience in maintenance in field environments. Therefore, it is still necessary to further improve the existing sprinkler head riser connector so that it can automatically control the sprinkler head water supply status according to the water supply pressure while maintaining the pipeline connection function. Summary of the Invention

[0004] This invention proposes a nozzle vertical pipe water passage fitting, which solves the technical problems in the prior art that cause inconsistent nozzle range and uneven spraying due to unstable, different or insufficient water supply pressure.

[0005] The technical solution of this invention is implemented as follows: A sprinkler head riser water passage fitting includes a housing and a pressure-response unlocking mechanism. The housing has an inlet end and an outlet end, which are connected by a water passage cavity. The inner wall of the water passage cavity has an axial groove and a spiral guide groove. An opening and closing mechanism is provided inside the water passage cavity. The opening and closing mechanism includes a movable ring. A limiting slider that cooperates with the axial groove is fixed on the outer side of the movable ring. A guide ring is rotatably connected to the movable ring. A guide block is fixed on the side wall of the guide ring and slides with the guide groove. Multiple circumferentially arranged opening and closing mechanisms are provided between the guide ring and the movable ring. The closed blades are all slidably and rotatably connected to the movable ring. Multiple open and closed blades enclose each other to form a variable water passage. The guide ring is driven by the open and closed blades. When the movable ring moves along the axial groove, the guide ring moves axially with the movable ring. The guide block slides along the guide groove and drives the guide ring to rotate circumferentially relative to the movable ring. The guide ring drives multiple open and closed blades to swing synchronously to change the opening degree of the variable water passage. The pressure response unlocking mechanism includes a pressure bearing component, an elastic reset component, and a locking component. The locking component can cooperate with the movable ring to restrict the movement of the movable ring along the axial groove.

[0006] Furthermore, the movable ring is provided with elongated holes corresponding to the opening and closing blades. A rotating shaft is fixed on the opening and closing blade, which can rotate in the elongated holes and slide along the elongated holes. A guide pin is rotatably connected to the opening and closing blade. The guide ring is provided with multiple arc-shaped elongated holes. The guide pin slides along the elongated holes. The elongated holes correspond to the elongated holes, and the extension directions of the elongated holes and the elongated holes are staggered. When the guide block slides along the guide groove, it drives the guide ring to rotate circumferentially. The guide ring drives multiple opening and closing blades to swing synchronously through the elongated holes and the guide pin.

[0007] Furthermore, the pressure-response unlocking mechanism includes a piston chamber connected to the water inlet end of the housing. A pressure-bearing piston is installed inside the piston chamber. A transmission rod is fixedly connected to the side of the pressure-bearing piston away from the housing. The transmission rod passes through the piston chamber. A connecting plate is fixed to the part of the transmission rod outside the piston chamber. A pressure-bearing spring is sleeved on the part of the transmission rod inside the piston chamber. A locking chamber is connected to the side wall of the water passage chamber. A locking pin is slidably connected inside the locking chamber. A locking rod is fixedly connected to one end of the locking pin. The locking rod passes through the locking chamber and is fixedly connected to the connecting plate. When the locking pin extends into the housing, the locking pin abuts against the top surface of the movable ring. When the pressure-bearing piston is pushed by the water inlet pressure, the pressure-bearing piston drives the locking pin out of the housing through the transmission rod, connecting plate, and locking rod, so that the movable ring can move along the axial groove.

[0008] Furthermore, the piston chamber includes a piston cavity body, with a piston cavity end cap screwed to one end of the piston cavity body away from the housing, a transmission rod passing through the piston cavity end cap, one end of a pressure-bearing spring abutting against the pressure-bearing piston, and the other end abutting against the piston cavity end cap.

[0009] Furthermore, the piston chamber is connected to the housing through a pressure transmission channel, which includes a cavity and a first damping orifice. The piston chamber is connected to the cavity, and the cavity is connected to the water inlet end of the housing through the first damping orifice.

[0010] Furthermore, a buffer groove is provided at the end of the water passage chamber near the water inlet, and a buffer ring is provided at the end of the movable ring. The buffer ring can enter the buffer groove, and the buffer groove is connected to a buffer chamber. The buffer chamber is connected to the buffer groove through a second damping hole. A buffer piston is provided in the buffer chamber, and the end of the buffer piston away from the second damping hole is abutted against the end of the buffer chamber through a buffer spring.

[0011] Furthermore, the bottom end of the movable ring is provided with a guide cone surface, and the end of the locking pin near the movable ring is provided with a guide angle, which can slide along the guide cone surface.

[0012] Furthermore, the movable ring abuts against the end of the water passage cavity via a return spring.

[0013] The beneficial effects of this technical solution are: This invention, by incorporating a movable ring, guide ring, guide block, spiral guide groove, axial groove, and multiple opening and closing blades within the water passage cavity of the housing, and in conjunction with a pressure-response unlocking mechanism, enables the connector to automatically control the opening and closing state of the water passage cavity based on the water supply pressure. When the water supply pressure is lower than the preset opening pressure, a locking component restricts the movable ring from moving along the axial groove, and the opening and closing blades remain closed or in a throttling state. This prevents the nozzle from spraying water prematurely when the pressure is insufficient, reducing insufficient range, poor atomization, and uneven irrigation caused by low-pressure spraying. When the water supply pressure reaches the preset opening pressure, the locking component releases the restriction on the movable ring. Under water pressure, the movable ring moves along the axial groove, and the guide ring moves axially with the movable ring. The guide block slides along the spiral guide groove and drives the guide ring to rotate circumferentially relative to the movable ring, thereby driving multiple opening and closing blades to swing synchronously, so that the variable water outlet gradually opens. This ensures that the sprinkler head supplies water under relatively stable pressure conditions, improving the consistency of spray range and irrigation uniformity. At the same time, this structure integrates the pressure control function into the sprinkler head riser connector, eliminating the need for additional manual or electric valves. This simplifies the sprinkler pipeline structure, reduces installation and maintenance costs, and improves the stability and reliability of the sprinkler system. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the opening and closing blades when they are closed. Figure 3 A three-dimensional structural diagram of the opening and closing blades when they are open; Figure 4 Exploded view of the moving ring, guide ring, and opening / closing blades; Figure 5 This is a top view of the present invention; Figure 6 for Figure 5 A three-dimensional sectional view of AA in the diagram; Figure 7 for Figure 6 A magnified view of a portion of point C in the middle; Figure 8 for Figure 5 A three-dimensional sectional view of BB in the image; Figure 9 for Figure 5 The sectional view of BB in the image.

[0016] The components are as follows: 1. Inlet end, 2. Outlet end, 3. Water passage cavity, 4. Axial slide groove, 5. Guide slide groove, 6. Movable ring, 7. Guide ring, 8. Opening and closing blade, 9. Long strip hole, 10. Rotating shaft, 11. Guide pin, 12. Long oval hole, 13. Piston cavity, 14. Pressure-bearing piston, 15. Transmission rod, 16. Connecting plate, 17. Pressure-bearing spring, 18. Locking cavity, 19. Locking pin, 20. Locking rod, 21. Piston cavity end cover, 22. Cavity, 23. First damping hole, 24. Buffer groove, 25. Buffer ring, 26. Buffer cavity, 27. Second damping hole, 28. Buffer piston, 29. Buffer spring, 30. Guide cone surface, 31. Guide angle, 32. Return spring. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this embodiment, it should be understood that the terms "center," "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the invention.

[0019] like Figure 1-9 As shown, this embodiment of the invention provides a sprinkler head riser water passage fitting, including a housing and a pressure-response unlocking mechanism. The housing has an inlet end 1 and an outlet end 2. The inlet end 1 is used to connect to the water supply side of the sprinkler pipeline or riser, and the outlet end 2 is used to connect to the outlet side of the sprinkler head or riser. The inlet end 1 and the outlet end 2 are connected through a water passage cavity 3. The housing can be made of engineering plastics, metal, or composite materials. The inlet end 1 and the outlet end 2 can be connected by threaded, socket, snap-fit, or quick-connect pipe connection methods. The above materials and connection methods are all conventional technologies in the field of pipe connectors. With the above structure, this connector can be adapted to existing sprinkler pipelines, facilitating installation and maintenance. The inner wall of the water passage cavity 3 is provided with a spiral guide groove 5 and an axial groove 4. The water passage cavity 3 is provided with an opening and closing mechanism, which includes a movable ring 6. The outer side of the movable ring 6 is provided with a limiting slider 33 that cooperates with the axial groove 4. The movable ring 6 can move along the axial groove 4 in the water passage cavity 3. The limiting slider 33 is used to limit the circumferential rotation of the movable ring 6, so that the movable ring 6 maintains axial movement. The movable ring 6 can serve as a component that bears water pressure and transmits axial movement, while reducing the possibility of deflection or jamming during movement.

[0020] A guide ring 7 is axially limited and circumferentially rotatably connected to the movable ring 6, allowing the guide ring 7 to move axially along the housing with the movable ring 6 and to rotate circumferentially relative to the movable ring 6. A guide block 34 is fixed to the side wall of the guide ring 7, and the guide block 34 slides in engagement with the spiral guide groove 5. The guide ring 7 and the movable ring 6 can be axially limited and circumferentially rotatably connected through an annular groove, a limiting flange, a retaining ring, or a snap ring. In use, the movable ring 6 moves axially under water pressure, the guide ring 7 moves axially with the movable ring 6, and the guide block 34 slides under the constraint of the spiral guide groove 5, thereby causing the guide ring 7 to rotate circumferentially relative to the movable ring 6. This structure can convert the axial motion formed by water pressure into the circumferential motion that drives the opening and closing blades 8.

[0021] Multiple circumferentially arranged opening and closing blades 8 are provided between the guide ring 7 and the movable ring 6. Each opening and closing blade 8 is slidably and rotatably connected to the movable ring 6. The multiple opening and closing blades 8 enclose a variable water passage, and the guide ring 7 is driven by the opening and closing blades 8. When the guide ring 7 rotates circumferentially relative to the movable ring 6, the guide ring 7 drives the multiple opening and closing blades 8 to swing synchronously, causing the opening degree of the variable water passage to change. The opening and closing blades 8 can adopt a plate-shaped valve plate, an arc-shaped plate, or a thin plate structure similar to an aperture blade. By swinging the multiple opening and closing blades 8 synchronously, the water passage can be gradually opened and gradually closed, which helps to improve the stability of the sprinkler head's water supply.

[0022] The pressure-response unlocking mechanism includes a pressure-bearing component, an elastic reset component, and a locking component. The locking component cooperates with the movable ring 6 to restrict the movement of the movable ring 6 along the axial groove 4. When the water supply pressure is lower than the preset opening pressure, the locking component is locked, the movable ring 6 cannot move, and the opening / closing blade 8 remains closed or in a throttling state. When the water supply pressure reaches or exceeds the preset opening pressure, the pressure-bearing component moves under pressure and drives the locking component to release the restriction on the movable ring 6. The movable ring 6 moves along the axial groove 4 under water pressure, and the variable water outlet opens through the linkage of the guide ring 7, guide block 34, and opening / closing blade 8. The pressure-response unlocking mechanism enables the sprinkler head riser water pipe fittings to automatically control the opening state according to the water supply pressure, preventing the sprinkler head from spraying water prematurely when the pressure is insufficient.

[0023] During installation and use, connect the inlet end 1 of the housing to the irrigation network or the water supply side of the riser, and connect the outlet end 2 of the housing to the nozzle or the outlet side of the riser. Initially, when the pipeline is not supplying water or the water pressure is low, the elastic reset element in the pressure response unlocking mechanism keeps the locking element in the locked state. The locking element restricts the movement of the movable ring 6 along the axial sliding groove 4, and the guide ring 7 and the opening / closing blades 8 remain in the closed or throttling position. Multiple opening / closing blades 8 enclose a small variable water inlet or close the variable water inlet, at which point the nozzle cannot receive effective water supply. This avoids low-pressure water spraying from the nozzle when the system is first started and the pipeline pressure has not yet been established. When the water pump continuously supplies water and the pressure at the inlet 1 gradually increases to the preset opening pressure, the pressure-bearing component in the pressure response unlocking mechanism moves under pressure, causing the locking component to exit the locked position. The movable ring 6 is released from its restriction, and then the water supply pressure pushes the movable ring 6 to move in the opening direction along the axial slide groove 4. The guide ring 7 moves axially with the movable ring 6, and the guide block 34 on the guide ring 7 slides along the spiral guide slide groove 5. Under the constraint of the guide slide groove 5, the guide ring 7 rotates circumferentially relative to the movable ring 6. At this time, the guide ring 7 further drives multiple opening and closing blades 8 to swing synchronously, so that the variable water outlet gradually increases. The water flows through the variable water outlet to the outlet 2 and supplies the nozzle. Therefore, the nozzle can start spraying water normally when it reaches or approaches the rated working pressure, which is beneficial to improving the consistency of the spray range and the uniformity of irrigation. When the water supply pressure decreases or stops, the water pressure on the pressure-bearing component in the pressure response unlocking mechanism decreases. The elastic reset component drives the locking component to reset to the locked position. Simultaneously, the movable ring 6 moves in the closing direction under the reset action, the guide block 34 slides in the opposite direction along the spiral guide groove 5, and the guide ring 7 rotates in the opposite direction relative to the movable ring 6. Multiple opening and closing blades 8 swing synchronously and gradually reduce the variable water passage. When the movable ring 6 returns to the closed position, the locking component re-engages with the movable ring 6, restricting the movement of the movable ring 6 and keeping the opening and closing mechanism in a closed or throttling state. This process can automatically close the water supply channel during low pressure or water outages, reducing low-pressure dripping, abnormal water spraying, and uneven irrigation caused by insufficient pressure at the end of the pipeline.

[0024] like Figures 2-4As shown, the movable ring 6 has elongated holes 9 corresponding to the opening and closing blades 8. A rotating shaft 10 is fixed to the opening and closing blade 8, and the rotating shaft 10 can rotate within and slide along the elongated holes 9. A guide pin 11 is rotatably connected to the opening and closing blade 8. The guide ring 7 has multiple arc-shaped elongated holes 12, and the guide pin 11 slides along the elongated holes 12. The elongated holes 12 correspond one-to-one with the elongated holes 9, and the extension direction of the elongated holes 12 intersects with the extension direction of the elongated holes 9. In use, the guide block 34 slides along the guide groove 5 and drives the guide ring 7 to rotate circumferentially. The elongated holes 12 on the guide ring 7 push the guide pin 11 to move, and the guide pin 11 drives the opening and closing blades 8 to move. Simultaneously, the rotating shaft 10 on the opening and closing blade 8 rotates and slides within the elongated holes 9, causing the opening and closing blades 8 to swing synchronously under the guidance constraint. The rotating shaft 10, guide pin 11, elongated holes 9, and elongated holes 12 are all common pin-hole guide structures used in mechanical transmissions. The movement trajectory of the opening and closing blades 8 can be made more stable by the cooperation of the elongated hole 9, the rotating shaft 10, the oblong hole 12 and the guide pin 11, so that multiple opening and closing blades 8 can keep opening and closing synchronously, reducing the problems of blade wobble, jamming and inconsistent opening.

[0025] like Figures 5-9 As shown, the pressure-response unlocking mechanism includes a piston chamber, which is connected to the water inlet 1 of the housing via a pressure transmission channel. A pressure-bearing piston 14 is located inside the piston chamber. A transmission rod 15 is fixedly connected to the side of the pressure-bearing piston 14 away from the housing. The transmission rod 15 passes through the piston chamber. A connecting plate 16 is fixed to the portion of the transmission rod 15 outside the piston chamber, and a pressure-bearing spring 17 is sleeved on the portion of the transmission rod 15 inside the piston chamber. A locking cavity 18 is provided on the side wall of the housing. A locking pin 19 is slidably connected within the locking cavity 18. A locking rod 20 is fixedly connected to one end of the locking pin 19. The locking rod 20 passes through the locking cavity 18 and is fixedly connected to the connecting plate 16. Under low pressure, the pressure spring 17 keeps the pressure-bearing piston 14, transmission rod 15, connecting plate 16, locking rod 20, and locking pin 19 in the locked position. The locking pin 19 extends into the housing and abuts against the limiting surface of the movable ring 6, thereby restricting the movement of the movable ring 6 along the axial groove 4. When the inlet water pressure increases, the pressure enters the piston chamber through the pressure transmission channel and pushes the pressure-bearing piston 14 to move. The pressure-bearing piston 14 drives the locking pin 19 out of the housing through the transmission rod 15, connecting plate 16 and locking rod 20, allowing the movable ring 6 to move. Through the pressure response unlocking mechanism, the water pressure change can be converted into the forward and backward movement of the locking pin 19, realizing low-pressure locking and high-pressure unlocking.

[0026] like Figures 5-9As shown, the piston chamber includes a piston body 13. A piston chamber end cap 21 is screwed to the end of the piston body 13 furthest from the housing. A transmission rod 15 passes through the piston chamber end cap 21. One end of a pressure spring 17 abuts against a pressure-bearing piston 14, and the other end abuts against the piston chamber end cap 21. In use, the piston chamber end cap 21 provides support for the pressure spring 17, which applies a restoring force to the pressure-bearing piston 14, causing the pressure-bearing piston 14 to maintain or return to a low-pressure position when the water supply pressure is insufficient. The piston chamber end cap 21 facilitates assembly and maintenance, improving the reliability of the pressure response unlocking mechanism.

[0027] like Figure 5-9 As shown, the pressure transmission channel includes a cavity 22 and a first damping hole 23. The piston chamber is connected to the cavity 22, and the cavity 22 is connected to the water inlet 1 of the housing through the first damping hole 23. In use, the water pressure at the water inlet 1 first enters the cavity 22 through the first damping hole 23, and then is transmitted to the piston chamber. The first damping hole 23 weakens the initial impact of the water flow and pressure fluctuations, preventing the pressure-bearing piston 14 from rapidly vibrating due to instantaneous water flow impacts. Through the cavity 22 and the first damping hole 23, the direct impact on the pressure-bearing piston 14 can be reduced, preventing the locking pin 19 from frequently moving in and out due to pressure fluctuations, and improving the stability of the unlocking action.

[0028] like Figure 5-9 As shown, a buffer groove 24 is provided on the side wall of the water passage 3 near the water inlet 1. A buffer ring 25 is provided at the end of the movable ring 6. The buffer ring 25 can enter the buffer groove 24. The buffer groove 24 is connected to a buffer chamber 26. The buffer chamber 26 is connected to the buffer groove 24 through a second damping hole 27. A buffer piston 28 is provided in the buffer chamber 26. The end of the buffer piston 28 away from the second damping hole 27 is abutted against the end of the buffer chamber 26 by a buffer spring 29. During the closing process, the movable ring 6 moves in the closing direction, the buffer ring 25 enters the buffer groove 24 and compresses the water in the buffer groove 24. The water enters the buffer chamber 26 through the second damping hole 27 and pushes the buffer piston 28 to move. Since the second damping hole 27 restricts the water flow velocity, the closing speed of the movable ring 6 is reduced, and the opening and closing blade 8 gradually narrows the variable water passage. Through the cooperation of the buffer groove 24, the buffer chamber 26 and the buffer ring 25, the instantaneous closing of the variable water passage can be avoided, reducing the water hammer impact during closing, thereby protecting the nozzle, riser and pipe joint.

[0029] like Figure 2-9As shown, the bottom end of the movable ring 6 is provided with a guide cone surface 30, and the end of the locking pin 19 near the movable ring 6 is provided with a guide angle 31, which can slide along the guide cone surface 30. When the movable ring 6 moves towards the water inlet end 1 to reset, the guide cone surface 30 at the bottom end of the movable ring 6 contacts the guide angle 31 at the end of the locking pin 19, and the guide angle 31 slides along the guide cone surface 30, allowing the locking pin 19 to smoothly enter the locking position. Both the guide cone surface 30 and the guide angle 31 are conventional inclined surface structures in mechanical limiting and guiding cooperation. Through this structure, the hard collision between the locking pin 19 and the movable ring 6 can be reduced, making the reset of the locking pin 19 smoother and reducing the risk of wear and jamming.

[0030] like Figure 5-9 As shown, the movable ring 6 abuts against the end of the water passage cavity 3 via the return spring 32. One end of the return spring 32 abuts against the end of the water passage cavity 3 or a spring seat inside the housing, and the other end abuts against the movable ring 6. When opened, the water pressure pushes the movable ring 6 to move and compress the return spring 32. When the water supply pressure drops to a level insufficient to overcome the elastic force of the return spring 32, the return spring 32 pushes the movable ring 6 to move back to the water inlet end 1. At this time, the movable ring 6 drives the guide ring 7, guide block 34, and opening / closing blade 8 to move in the opposite direction, causing the variable water passage to close or narrow. The return spring 32 can be a compression spring, a wave spring, or a disc spring. The return spring 32 enables the movable ring 6 to automatically return to its original position under low pressure or water stop conditions, giving the connection an automatic closing capability and reducing water leakage and abnormal spraying when the pressure is insufficient.

[0031] In summary, the basic scheme in this embodiment achieves automatic locking, automatic unlocking, and automatic opening and closing based on water supply pressure. The further structures supplement the synchronous opening and closing of the blades, pressure-response unlocking, damping pressure transmission, slow-closing to prevent water hammer, locking guidance, and reset, enabling the connectors to more stably achieve low-pressure closure, pressure-reaching opening, buffer unlocking, and slow closure during actual sprinkler irrigation, thereby improving the stability of the sprinkler head's working pressure and the uniformity of irrigation.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A nozzle riser water passage fitting, characterized in that: The device includes a housing and a pressure-response unlocking mechanism. The housing has an inlet (1) and an outlet (2), which are connected by a water passage cavity (3). The inner wall of the water passage cavity (3) has an axial groove (4) and a spiral guide groove (5). The water passage cavity (3) has an opening and closing mechanism, which includes a movable ring (6). A limiting slider (33) that cooperates with the axial groove (4) is fixed on the outer side of the movable ring (6). A guide ring (7) is rotatably connected to the movable ring (6). A guide block (34) is fixed on the side wall of the guide ring (7). The guide block (34) slides with the guide groove (5). Multiple circumferentially arranged opening and closing mechanisms are provided between the guide ring (7) and the movable ring (6). The blades (8) are all slidably and rotatably connected to the movable ring (6). Multiple opening and closing blades (8) enclose to form a variable water passage. The guide ring (7) is driven to cooperate with the opening and closing blades (8). When the movable ring (6) moves along the axial groove (4), the guide ring (7) moves axially with the movable ring (6). The guide block (34) slides along the guide groove (5) and drives the guide ring (7) to rotate circumferentially relative to the movable ring (6). The guide ring (7) drives multiple opening and closing blades (8) to swing synchronously to change the opening degree of the variable water passage. The pressure response unlocking mechanism includes a pressure bearing component, an elastic reset component and a locking component. The locking component can cooperate with the movable ring (6) to restrict the movement of the movable ring (6) along the axial groove (4).

2. The nozzle riser water passage fitting according to claim 1, characterized in that: The movable ring (6) is provided with elongated holes (9) corresponding to the opening and closing blades (8). A rotating shaft (10) is fixed on the opening and closing blades (8). The rotating shaft (10) can rotate in the elongated holes (9) and slide along the elongated holes (9). A guide pin (11) is rotatably connected to the opening and closing blades (8). Multiple arc-shaped elongated holes (12) are provided on the guide ring (7). The guide pin (11) slides along the elongated holes (12). The elongated holes (12) correspond to the elongated holes (9) one by one, and the extension direction of the elongated holes (12) is staggered with the extension direction of the elongated holes (9). When the guide block (34) slides along the guide groove (5), it drives the guide ring (7) to rotate circumferentially. The guide ring (7) drives multiple opening and closing blades (8) to swing synchronously through the elongated holes (12) and the guide pin (11).

3. The nozzle riser water passage fitting according to claim 1, characterized in that: The pressure-response unlocking mechanism includes a piston chamber, which is connected to the side wall of the water inlet end (1) of the housing. A pressure-bearing piston (14) is provided in the piston chamber. A transmission rod (15) is fixedly connected to the side of the pressure-bearing piston (14) away from the housing. The transmission rod (15) passes through the piston chamber. A connecting plate (16) is fixed to the part of the transmission rod (15) outside the piston chamber. A pressure-bearing spring (17) is sleeved on the part of the transmission rod (15) inside the piston chamber. A locking chamber (18) is connected to the side wall of the water passage chamber (3). A lock is slidably connected in the locking chamber (18). The locking pin (19) has a locking rod (20) fixedly connected to one end. The locking rod (20) passes through the locking cavity (18) and is fixedly connected to the connecting plate (16). When the locking pin (19) extends into the housing, the locking pin (19) abuts against the top surface of the movable ring (6). When the pressure piston (14) is pushed by the water inlet pressure, the pressure piston (14) drives the locking pin (19) out of the housing through the transmission rod (15), the connecting plate (16) and the locking rod (20), so that the movable ring (6) can move along the axial groove (4).

4. The nozzle riser water passage fitting according to claim 3, characterized in that: The piston chamber includes a piston chamber body (13), and a piston chamber end cap (21) is screwed to one end of the piston chamber body (13) away from the housing. A transmission rod (15) passes through the piston chamber end cap (21). One end of the pressure spring (17) abuts against the pressure piston (14), and the other end abuts against the piston chamber end cap (21).

5. A nozzle riser water passage fitting according to claim 3, characterized in that: The piston chamber is connected to the side wall of the water inlet end (1) of the shell through a pressure transmission channel. The pressure transmission channel includes a cavity (22) and a first damping hole (23). The piston chamber is connected to the cavity (22), and the cavity (22) is connected to the water inlet end (1) of the shell through the first damping hole (23).

6. The nozzle riser water passage fitting according to claim 1, characterized in that: The water passage cavity (3) is provided with a buffer groove (24) at one end near the water inlet (1), and a buffer ring (25) is provided at the end of the movable ring (6). The buffer ring (25) can enter the buffer groove (24). The buffer groove (24) is connected to the buffer chamber (26). The buffer chamber (26) is connected to the buffer groove (24) through the second damping hole (27). The buffer chamber (26) is provided with a buffer piston (28). The end of the buffer piston (28) away from the second damping hole (27) is abutted against the end of the buffer chamber (26) through a buffer spring (29).

7. A nozzle riser water passage fitting according to claim 3, characterized in that: The end of the movable ring (6) is provided with a guide cone surface (30), and the locking pin (19) is provided with a guide angle (31) at one end near the movable ring (6). The guide angle (31) can slide along the guide cone surface (30).

8. A nozzle riser water passage fitting according to any one of claims 1 to 7, characterized in that: The movable ring (6) abuts against the end of the water passage cavity (3) via the return spring (32).

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