A drip irrigation head and its welding structure

Abstract

This utility model discloses a drip irrigation head and its welding structure. The welding structure includes a base and a top cover. One of the base and the top cover has an outer tube with an installation cavity, and the other has a welding surface that abuts against the end of the outer tube. The end of the outer tube has an ultrasonic rib that is circumferentially arranged and protrudes towards the welding surface. The outer side of the ultrasonic rib has a concave annular groove. The base and the top cover are fixed by ultrasonic welding. After the ultrasonic rib melts, it diffuses and fills the annular groove. The drip irrigation head includes a base, a top cover, and a diaphragm. The base has a water inlet connector, the top cover has a water outlet connector, and the diaphragm is located in the pressure regulating chamber. This utility model, through the cooperation of the ultrasonic rib and the annular groove, allows the molten material to be directionally filled into the annular groove, preventing overflow into the pressure regulating chamber or turbulence channel, improving the flatness and sealing reliability of the welding surface, ensuring the sealing of the pressure compensation chamber, and thus ensuring irrigation uniformity.

Description

Technical Field

[0001] This utility model relates to the technical field of agricultural irrigation drippers, and in particular to a drip irrigation head and its welding structure. Background Technology

[0002] Drip irrigation technology is a commonly used irrigation method in agricultural planting. Pressure-compensated drippers are a type of drip irrigation device used for agricultural irrigation. Their feature is that they can automatically compensate for pressure differences between different areas, thereby ensuring that each dripper sprays the same amount of water, avoiding the problem of uneven water volume caused by undulating terrain or excessively long pipelines.

[0003] On-pipe pressure-compensating drip heads are key components of drip irrigation systems. Through their internal pressure compensation mechanism, they maintain a relatively stable water flow rate under different operating pressures, thereby improving irrigation uniformity. Existing on-pipe pressure-compensating drip heads typically consist of a base, a top cover, and internal pressure compensation elements, with the base and top cover often connected by welding or adhesive. However, existing welded structures directly weld the connection surfaces of the base and top cover, resulting in poor weld surface flatness and insufficient sealing. This affects the sealing reliability of the pressure compensation chamber, leading to decreased irrigation uniformity. Furthermore, molten material overflowing during welding may enter the pressure compensation chamber or labyrinth channels, causing internal blockage and affecting the normal operation of the drip head.

[0004] In view of this, this utility model addresses the shortcomings of existing pipe-type pressure-compensating drip irrigation heads, which do not have a directional melting and containment structure at the welding surface, resulting in disordered diffusion of molten material during ultrasonic welding. This not only damages the flatness of the welding surface but also makes it easy for the molten material to overflow into the internal cavity or flow channel. This utility model was developed through in-depth research, improvement, and trial production. Utility Model Content

[0005] The purpose of this utility model is to overcome the defects of poor flatness and insufficient sealing of the welding surface between the base and the top cover in the prior art, and to provide a drip irrigation head and its welding structure.

[0006] To achieve the above objectives, the solution of this utility model is: A welding structure for a drip irrigation head includes a base and a top cover. One of the base and the top cover has an outer tube with an installation cavity, and the other has a welding surface that abuts against the end of the outer tube. The inner side of the welding surface forms a pressure regulating cavity that mates with the insertion of the outer tube. The end of the outer tube has an ultrasonic rib that is arranged circumferentially and protrudes toward the welding surface. The end of the outer tube has a concave annular groove on the outer side of the ultrasonic rib. The base and the top cover are ultrasonically welded together by the outer tube and the welding surface. After the ultrasonic rib melts, it diffuses and fills the annular groove.

[0007] With the above structure, the welding structure of the drip irrigation head of this utility model has ultrasonic ribs at the end of the outer tube and annular grooves on the outside of the ultrasonic ribs. During ultrasonic welding, the ultrasonic ribs melt under the action of ultrasonic energy. After the ultrasonic ribs melt, the molten material that diffuses outward is directionally contained and filled by the annular groove on the outside of the ultrasonic ribs. The molten material that diffuses inward is restricted by the stop of the outer wall of the pressure regulating cavity that has been inserted into the installation cavity. The molten material cannot cross the outer wall of the pressure regulating cavity and enter the installation cavity, let alone enter the internal flow channel of the pressure regulating cavity. The molten material diffuses and fills the annular groove to form a dense weld, thereby ensuring the flatness and sealing reliability of the weld surface, preventing leakage of the pressure compensation chamber, ensuring the flow stability of the drip irrigation head under different working pressures, and improving irrigation uniformity.

[0008] Furthermore, the base has an outer tube with an opening facing the upper cover. The upper cover has a pressure regulating cavity corresponding to the mounting cavity and a faceplate connected to one end of the pressure regulating cavity. The outer diameter of the faceplate is larger than the outer diameter of the pressure regulating cavity, so that the bottom surface of the faceplate forms the welding surface on the outer periphery of the pressure regulating cavity. The outer peripheral wall of the pressure regulating cavity corresponds to the inner wall of the mounting cavity. After the pressure regulating cavity is inserted into the mounting cavity, the welding surface of the faceplate is welded to the end of the outer tube of the base. The insertion of the pressure regulating cavity into the mounting cavity achieves radial positioning of the base and the upper cover. The bottom surface of the faceplate forms a flat welding surface, which facilitates ultrasonic welding operations. The outer peripheral wall of the pressure regulating cavity fits with the inner wall of the mounting cavity, enhancing the coaxiality and structural stability of the connection between the base and the upper cover.

[0009] Furthermore, the ultrasonic rib and the outer tube are integrally formed. This integral structure ensures the structural continuity between the ultrasonic rib and the outer tube, avoids the risk of the ultrasonic rib falling off or shifting during the welding process, simplifies the manufacturing process, and improves the consistency of welding quality.

[0010] Furthermore, the ultrasonic ribs are spaced apart from the inner circumferential surface of the mounting cavity, creating a buffer gap between the ultrasonic ribs and the inner wall of the mounting cavity. After the pressure regulating cavity of the upper cover is inserted into the mounting cavity, the outer circumferential wall of the pressure regulating cavity and the inner circumferential wall of the mounting cavity form an insertion fit. This fit surface forms a continuous lateral solid stop on the inner side of the ultrasonic ribs. During ultrasonic welding, a small amount of molten material that diffuses inward after the ultrasonic ribs melts is contained within the buffer gap and is restricted by the lateral stop of the fit surface between the outer wall of the pressure regulating cavity and the inner wall of the mounting cavity, preventing it from crossing this fit surface to enter the interior of the mounting cavity and the pressure regulating cavity. The molten material that diffuses outward fills the annular groove, thereby effectively preventing the molten material from clogging the internal flow channels.

[0011] Furthermore, the cross-section of the ultrasonic rib is any one of a triangle, trapezoid, semi-ellipse, or semi-circle that gradually tapers from the end of the outer tube towards the welding surface, while the cross-section of the annular groove is arc-shaped, rectangular, or V-shaped. The tapered cross-section of the ultrasonic rib facilitates the concentration of ultrasonic energy, improves welding efficiency, and guides the molten material to flow directionally into the annular groove; the arc-shaped, rectangular, or V-shaped cross-section of the annular groove facilitates the full filling of the molten material, increases the welding contact area, and improves the sealing strength. Furthermore, the ultrasonic rib is made of ABS. ABS material has good ultrasonic welding response characteristics, moderate melting temperature, good melt flow, and is easy to soften and fill the annular groove under ultrasonic vibration to form a dense weld sealing layer.

[0012] A drip irrigation head includes a base, a top cover, and a diaphragm. One end of the base has a water inlet connector, and one end of the top cover has a water outlet connector. One of the base and the top cover has an outer tube with an installation cavity, and the other has a welding surface that abuts against the end of the outer tube and a pressure regulating cavity inserted into the installation cavity. The pressure regulating cavity communicates with the water inlet connector through the water inlet cavity and with the water outlet connector through the water outlet cavity. The diaphragm is disposed within the pressure regulating cavity. The end of the outer tube has an ultrasonic rib arranged circumferentially and protruding towards the welding surface. A concave annular groove is provided on the outer side of the ultrasonic rib at the end of the outer tube. The base and the top cover are ultrasonically welded together via the outer tube and the welding surface. After melting, the ultrasonic rib diffuses and fills the annular groove. Applying this welding structure to the drip irrigation head prevents molten material from overflowing into the pressure regulating cavity or internal flow channels during ultrasonic welding, ensuring the sealing reliability of the pressure compensation chamber and preventing a decrease in irrigation uniformity due to poor welding sealing.

[0013] Furthermore, one end of the base is provided with a water inlet connector, and the other end of the base is provided with the outer tube. The outer tube has an installation cavity with its opening facing the upper cover. The upper cover has a pressure regulating cavity corresponding to the installation cavity and a face cover connected to one end of the pressure regulating cavity. The outer diameter of the face cover is larger than the outer diameter of the pressure regulating cavity, so that the bottom surface of the face cover forms the welding surface on the outer periphery of the pressure regulating cavity. The outer peripheral wall of the pressure regulating cavity corresponds to the inner wall of the installation cavity. After the pressure regulating cavity is inserted into the installation cavity, the welding surface of the face cover is welded to the end of the outer tube of the base. The insertion and mating structure of the pressure regulating cavity and the installation cavity makes the overall structure of the drip irrigation head compact, with high assembly precision and a smooth welding surface, which is beneficial to improving the welding quality stability in mass production.

[0014] Furthermore, the diaphragm divides the pressure regulating chamber into an inlet chamber and an outlet chamber. A wavy turbulence channel is provided on the outer periphery of the pressure regulating chamber. One end of the turbulence channel has an inlet connecting to the inlet chamber, and the other end has an outlet connecting to the outlet chamber. The diaphragm elastically deforms according to the inlet pressure, automatically adjusting the cross-sectional area of ​​the water passage to achieve pressure compensation. Water flows through the inlet into the wavy turbulence channel, where turbulence dissipates energy, reducing water flow pulsation and stabilizing the outlet flow rate.

[0015] Furthermore, the mounting cavity of the base is provided with a limiting groove, and the end of the pressure regulating cavity of the upper cover corresponds to the limiting groove. The water inlet connector of the base is provided with a filter screen. During assembly, the end of the pressure regulating cavity abuts against the bottom of the limiting groove, precisely controlling the insertion depth of the pressure regulating cavity into the mounting cavity, ensuring the accurate installation position of the diaphragm in the pressure regulating cavity, and ensuring that the diaphragm has appropriate working deformation space; the filter screen intercepts impurity particles in the water at the water inlet end, preventing blockage of the turbulence channel and the inlet and outlet, ensuring unobstructed flow, and extending the service life of the drip irrigation head. Attached Figure Description

[0016] Figure 1 This is an exploded view of the present invention.

[0017] Figure 2 This is an exploded view of the present invention from another direction.

[0018] Figure 3 This is a schematic diagram of the combination of the present invention.

[0019] Figure 4 This is a schematic diagram of another aspect of the present invention.

[0020] Figure 5 This is a cross-sectional schematic diagram of the base of this utility model.

[0021] Figure 6 This is a cross-sectional view of the combination of the base and the top cover of this utility model.

[0022] Label Explanation: 1. Base; 2. Top cover; 3. Diaphragm; 4. Inlet connector; 5. Outlet connector; 6. Outer pipe; 7. Mounting cavity; 8. Welding surface; 9. Pressure regulating cavity; 10. Top cover; 11. Ultrasonic rib; 12. Annular groove; 13. Inlet cavity; 14. Outlet cavity; 15. Turbulence groove; 16. Inlet; 17. Outlet; 18. Limiting groove; 19. Filter screen. Detailed Implementation

[0023] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0025] like Figures 1 to 6 As shown, this utility model discloses a drip irrigation head, including a base 1, an upper cover 2, and a diaphragm 3.

[0026] The lower end of the base 1 is provided with a water inlet connector 4, which is a conical tubular structure used for connection with a drip irrigation pipe. The upper end of the base 1 has an outer tube 6, which is a circular tubular structure extending upward from the upper end of the base 1. The outer tube 6 forms an installation cavity 7 with its opening facing the upper cover 2. The installation cavity 7 is a circular cavity. The bottom of the installation cavity 7 is provided with a limiting groove 18, which is an annular groove arranged around the central axis of the installation cavity 7. The inside of the water inlet connector 4 is provided with a filter screen 19, which is a mesh structure that covers the flow channel cross-section of the water inlet connector 4.

[0027] The upper cover 2 includes a face cover 10, a pressure regulating chamber 9, and a water outlet connector 5. The face cover 10 has a disc-shaped structure, the outer diameter of which is larger than the outer diameter of the pressure regulating chamber 9. The pressure regulating chamber 9 is a cylindrical structure extending downward from the bottom surface of the face cover 10, and the outer peripheral wall of the pressure regulating chamber 9 corresponds to the inner wall diameter of the mounting cavity 7, allowing the pressure regulating chamber 9 to be inserted into the mounting cavity 7. The bottom surface of the face cover 10 forms a flat welding surface 8 on the outer periphery of the pressure regulating chamber 9. The water outlet connector 5 is a conical tubular structure, located at the top center of the face cover 10, for discharging water at a stable flow rate.

[0028] The upper end of the outer tube 6 has an ultrasonic rib 11 continuously arranged along the circumference of the outer tube 6 and protruding towards the welding surface 8. The ultrasonic rib 11 is an annular protrusion and is integrally formed with the outer tube 6. The ultrasonic rib 11 is spaced apart from the inner circumferential surface of the mounting cavity 7, forming an annular buffer gap. In the embodiment shown in the figure, the cross-section of the ultrasonic rib 11 is a triangle that gradually tapers from the end of the outer tube 6 to the welding surface 8. The cross-section of the ultrasonic rib 11 can also be designed as trapezoidal, semi-elliptical, semi-circular, etc. The annular groove 12 is provided on the outside of the ultrasonic rib 11. The annular groove 12 is an annular groove that is concave along the end of the outer tube 6, and its cross-section can be arc-shaped, rectangular, or V-shaped, etc. The ultrasonic rib 11 is made of ABS.

[0029] The pressure regulating chamber 9 is equipped with a diaphragm 3, which is a circular elastic sheet that divides the pressure regulating chamber 9 into an inlet chamber 13 located below the diaphragm 3 and an outlet chamber 14 located above the diaphragm 3. The outer peripheral wall of the pressure regulating chamber 9 is provided with a wavy turbulence channel 15, which is a groove arranged spirally or circumferentially along the outer peripheral wall of the pressure regulating chamber 9. One end of the turbulence channel 15 has an inlet 16 connecting to the inlet chamber 13, and the other end of the turbulence channel 15 has an outlet 17 connecting to the outlet chamber 14.

[0030] During assembly, the diaphragm 3 is placed inside the pressure regulating cavity 9, with its edge engaging and positioned against the inner wall of the cavity. The pressure regulating cavity 9 of the upper cover 2 is aligned with the mounting cavity 7 of the base 1 and inserted. The outer peripheral wall of the pressure regulating cavity 9 slides against the inner wall of the mounting cavity 7, achieving radial positioning. The lower end of the pressure regulating cavity 9 abuts against the limiting groove 18 at the bottom of the mounting cavity 7, limiting the insertion depth. At this time, the welding surface 8 of the bottom surface of the cover 10 abuts against the upper end of the outer tube 6 of the base 1, and the ultrasonic rib 11 presses against the welding surface 8.

[0031] During ultrasonic welding, the assembled base 1 and top cover 2 are placed in the fixture of the ultrasonic welding equipment. The ultrasonic welding head acts on the face cover 10 of the top cover 2 or the outer tube 6 of the base 1, generating high-frequency mechanical vibration. The ultrasonic rib 11 melts rapidly under the action of ultrasonic energy. The molten ABS material diffuses and directionally fills the annular groove 12 on the outside of the ultrasonic rib 11 under pressure, forming a dense and continuous annular weld. Because the ultrasonic rib 11 is spaced apart from the inner wall of the mounting cavity 7, and the annular groove 12 is located on the outside of the ultrasonic rib 11, the molten material is confined to the area between the welding surface 8 and the annular groove 12, and will not overflow into the mounting cavity 7 or the pressure regulating cavity 9, thereby ensuring the flatness and sealing reliability of the welding surface 8.

[0032] During operation, water from the drip irrigation pipe enters through the inlet connector 4, is filtered by the filter screen 19, and then enters the flow channel inside the base 1, subsequently entering the inlet chamber 13 of the pressure regulating chamber 9. When the inlet pressure increases, the diaphragm 3 deforms upward, reducing the cross-sectional area of ​​the water passage; when the inlet pressure decreases, the diaphragm 3 returns to its original position downward, increasing the cross-sectional area of ​​the water passage. The elastic deformation of the diaphragm 3 automatically adjusts the cross-sectional area of ​​the water passage, achieving pressure compensation and maintaining a stable outflow rate. Water in the inlet chamber 13 flows through the inlet 16 into the turbulence channel 15, where turbulence is generated, consuming water flow energy and reducing pulsation. It then flows through the outlet 17 into the outlet chamber 14, and finally flows out stably from the outlet connector 5.

[0033] In the above embodiment, the outer tube 6 is disposed on the base 1, and the face cover 10 and the pressure regulating cavity 9 are disposed on the upper cover 2. Alternatively, the outer tube 6 can also be disposed on the upper cover 2, while the pressure regulating cavity 9 and the face cover 10 are disposed on the base 1. The end of the face cover 10 has a welding surface 8 that abuts against the outer tube 6. The inner side of the welding surface 8 forms a pressure regulating cavity 9 that is inserted and fitted with the outer tube 6. The end of the outer tube 6 has an ultrasonic rib 11 that is arranged circumferentially along the outer tube 6 and protrudes toward the welding surface 8. The end of the outer tube 6 has a concave annular groove 12 on the outer side of the ultrasonic rib 11. The base 1 and the upper cover 2 are ultrasonically welded together by the outer tube 6 and the welding surface 8. After the ultrasonic rib 11 melts, it diffuses and fills the annular groove 12.

[0034] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A welding structure for a drip irrigation head, characterized in that, The device includes a base (1) and a top cover (2). One of the base (1) and the top cover (2) has an outer tube (6) with an installation cavity (7), and the other has a welding surface (8) that abuts against the end of the outer tube (6). The inner side of the welding surface (8) forms a pressure regulating cavity (9) that is inserted and matched with the outer tube (6). The end of the outer tube (6) has an ultrasonic rib (11) that is arranged circumferentially along the outer tube (6) and protrudes toward the welding surface (8). The end of the outer tube (6) has an inwardly recessed annular groove (12) on the outer side of the ultrasonic rib (11). The base (1) and the top cover (2) are ultrasonically welded together by the outer tube (6) and the welding surface (8). After the ultrasonic rib (11) melts, it diffuses and fills the annular groove (12).

2. The welding structure of a drip irrigation head as described in claim 1, characterized in that: The base (1) has the outer tube (6), the outer tube (6) has an installation cavity (7) with an opening facing the upper cover (2), the upper cover (2) has a pressure regulating cavity (9) corresponding to the installation cavity (7) and a face cover (10) connected to one end of the pressure regulating cavity (9), the outer diameter of the face cover (10) is larger than the outer diameter of the pressure regulating cavity (9), so that the bottom surface of the face cover (10) forms the welding surface (8) on the outer periphery of the pressure regulating cavity (9), the outer diameter of the pressure regulating cavity (9) corresponds to the inner diameter of the installation cavity (7), after the pressure regulating cavity (9) is inserted into the installation cavity (7), the welding surface (8) of the face cover (10) is welded together with the end of the outer tube (6) of the base (1).

3. The welding structure of a drip irrigation head as described in claim 1, characterized in that: The ultrasonic rib (11) and the outer tube (6) are integrally formed.

4. The welding structure of a drip irrigation head as described in claim 2, characterized in that: The ultrasonic rib (11) and the inner circumferential surface of the mounting cavity (7) are spaced apart, so that a buffer gap is formed between the ultrasonic rib (11) and the inner wall of the mounting cavity (7). After the pressure regulating cavity (9) of the upper cover (2) is inserted into the mounting cavity (7), the outer circumferential wall of the pressure regulating cavity (9) and the inner circumferential wall of the mounting cavity (7) form an insertion fit. The fit surface forms a continuous lateral solid stop on the inner side of the ultrasonic rib (11).

5. The welding structure of a drip irrigation head as described in claim 1, characterized in that: The cross section of the ultrasonic rib (11) is any one of triangle, trapezoid, semi-ellipse, or semi-circle that gradually narrows from the end of the outer tube (6) to the welding surface (8). The cross section of the annular groove (12) is arc-shaped, rectangular, or V-shaped.

6. The welding structure of a drip irrigation head as described in claim 1, characterized in that: The ultrasonic rib (11) is made of ABS.

7. A drip irrigation head, comprising a base (1), a top cover (2), and a diaphragm (3), characterized in that: One end of the base (1) is provided with a water inlet connector (4), and one end of the top cover (2) is provided with a water outlet connector (5). One of the base (1) and the top cover (2) has an outer tube (6) with an installation cavity (7), and the other has a welding surface (8) that abuts against the end of the outer tube (6) and a pressure regulating cavity (9) inserted into the installation cavity (7). The pressure regulating cavity (9) is connected to the water inlet connector (4) through the water inlet cavity (13) and to the water outlet connector (5) through the water outlet cavity (14). The pressure regulating chamber (9) is provided with the diaphragm (3). The end of the outer tube (6) has an ultrasonic rib (11) arranged around the outer tube (6) and protruding towards the welding surface (8). The end of the outer tube (6) has an inwardly recessed annular groove (12) on the outside of the ultrasonic rib (11). The base (1) and the top cover (2) are ultrasonically welded together with the welding surface (8) through the outer tube (6). After the ultrasonic rib (11) melts, it diffuses and fills the annular groove (12).

8. A drip irrigation head as described in claim 7, characterized in that: One end of the base (1) is provided with a water inlet connector (4), and the other end of the base (1) is provided with the outer tube (6). The outer tube (6) has an installation cavity (7) with an opening facing the upper cover (2). The upper cover (2) has a pressure regulating cavity (9) corresponding to the installation cavity (7) and a face cover (10) connected to one end of the pressure regulating cavity (9). The outer diameter of the face cover (10) is larger than the outer diameter of the pressure regulating cavity (9), so that the bottom surface of the face cover (10) forms the welding surface (8) on the outer periphery of the pressure regulating cavity (9). The outer diameter of the pressure regulating cavity (9) corresponds to the inner diameter of the installation cavity (7). After the pressure regulating cavity (9) is inserted into the installation cavity (7), the welding surface (8) of the face cover (10) is welded together with the end of the outer tube (6) of the base (1).

9. A drip irrigation head as described in claim 8, characterized in that: The diaphragm (3) divides the pressure regulating chamber (9) into an inlet chamber (13) and an outlet chamber (14). The outer periphery of the pressure regulating chamber (9) is provided with a turbulent channel (15) arranged in a wave shape. One end of the turbulent channel (15) is provided with an inlet (16) that connects to the inlet chamber (13), and the other end of the turbulent channel (15) is provided with an outlet (17) that connects to the outlet chamber (14).

10. A drip irrigation head as described in claim 7, characterized in that: The mounting cavity (7) of the base (1) is provided with a limiting groove (18), the end of the pressure regulating cavity (9) of the upper cover (2) abuts against the limiting groove (18), and the water inlet connector (4) of the base (1) is provided with a filter screen (19).

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