A drip irrigation system for forest trees that prevents water from seeping vertically down sandy soil and has an adjustable infiltration range.

Abstract

This utility model relates to the field of root irrigation technology, and discloses a drip irrigation device for trees that prevents water from seeping vertically down sandy soil and has an adjustable seepage range. In this utility model, a distribution pipe with a closed bottom and seepage holes on the side is installed below the dripper. This changes the drip irrigation method from a single-hole, drop-by-drop downward flow to a horizontal seepage flow along multiple transverse seepage holes. The water flow velocity from each seepage hole is almost zero, and the seeping water is completely absorbed by the soil before it can form a large macroscopic water body significantly affected by gravity, thus minimizing the influence of gravity. The water tends to diffuse horizontally around the outer pipe, preventing vertical seepage into areas unusable by the tree roots. Furthermore, since the seepage holes are formed by the overlapping of inner and outer seepage holes, the size of the seepage holes can be adjusted by rotating the inner pipe, thus creating different diffusion ranges to suit different types of trees and facilitating cleaning after use.

Description

Technical Field

[0001] This utility model relates to the field of root watering device technology, and in particular to a drip irrigation device for trees that prevents water from seeping vertically down the sand and has an adjustable seepage range. Background Technology

[0002] Drip irrigation is a highly efficient irrigation method. Unlike flood irrigation or sprinkler irrigation, drip irrigation only wets the soil near the crop roots. During drip irrigation, water is delivered to drippers near the plant roots through a drip irrigation network. The drippers then balance the pressure, forming a stream of water that irrigates the crop drop by drop.

[0003] Drip irrigation is commonly used in arid regions where water resources are scarce, and the soil in these areas is typically sandy. Sandy soil has poor water retention capacity, and water infiltrates quickly. When drip irrigation is applied to sandy soil, water infiltrates rapidly. However, because horizontal infiltration is driven only by capillary force, while vertical infiltration is driven by both capillary force and gravity, the water infiltrates even faster in the vertical direction. This has little impact on herbaceous crops or small shrubs like cotton, because firstly, the root systems of these crops do not extend much laterally in the soil, and secondly, each drip irrigation session for these crops is short, the infiltration depth is limited, and the infiltrated water can gradually diffuse laterally afterward.

[0004] However, the impact of drip irrigation on trees in sandy areas must be considered. Trees require large amounts of water, and with prolonged drip irrigation sessions, water seeps into the sand to depths far from the root system, forming a columnar structure of moist soil. Even considering the subsequent lateral spread of the infiltrated water, a significant portion is wasted. For example, fruit trees like pears, apricots, and grapes, unlike timber trees, are typically pruned into short, multi-branched structures for easier management and to ensure peak fruit production. Their root systems also differ from the clearly defined taproot structure of wild trees, instead having multiple branches (because these fruit trees are not seedlings), and their root distribution is not deep. However, conventional drip irrigation systems concentrate water in a narrow area. This causes the tree's roots to also grow in that area, forming "linear roots" or "basin-shaped roots" instead of outward-expanding "umbrella-shaped roots." Such trees have poor wind resistance and a limited nutrient absorption range.

[0005] Existing technologies often address this issue by using a large number of low-flow drip irrigation heads. While this ensures that water is evenly distributed in the sandy soil around the trees, these low-flow drip irrigation heads are very prone to clogging, and their extensive use also increases material and labor costs.

[0006] In the process of grouting reinforcement of soil and rock, generally speaking, the smaller the grouting hole on the steel pipe, the larger the grout diffusion range. Utility Model Content

[0007] This invention provides a drip irrigation device for trees that prevents water from seeping vertically down the sand and has an adjustable seepage range.

[0008] The technical problem to be solved is that when drip irrigation is applied to trees in sandy soil, the water tends to seep vertically downwards, resulting in water waste.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a drip irrigation device for trees that prevents water from seeping vertically down the sand and has an adjustable seepage range. Each drip irrigation device includes a dripper that is connected to the drip irrigation capillary tube through a conduit, and also includes a distribution pipe for allowing water to seep horizontally in the soil. The distribution pipe includes an inner pipe and an outer pipe. Both the inner pipe and the outer pipe are rigid pipes that are open at the top and sealed at the bottom. The inner pipe is inserted into the outer pipe and fits tightly against the outer pipe. The inner tube has multiple vertical rows of internal seepage holes evenly distributed on its sidewall, and the outer tube has multiple vertical rows of external seepage holes evenly distributed on its sidewall. The internal seepage holes and external seepage holes correspond one-to-one, are the same size, and are aligned with each other. The inner tube can rotate along the central axis in the outer tube and is equipped with a locking device for locking the rotation. When drip irrigating trees, the drip irrigation device is set around the trees, and the locking device locks the inner tube in a state in which the inner seepage hole and the outer seepage hole are partially aligned. The outer tube is vertically inserted into the sand and the dripper is inserted into the inner tube.

[0010] Furthermore, the inner tube has a fastening slit extending downwards from the top side to allow the top of the inner tube to be expanded. The locking device includes a drip tip and a fastening slit. The outer diameter of the portion of the drip tip inserted into the inner tube is larger than the inner diameter of the inner tube. After being inserted into the inner tube, the drip tip expands the inner tube and presses it against the outer tube to lock the rotation of the inner tube.

[0011] Furthermore, both the inner and outer seepage holes are elliptical holes with their major axes set horizontally, and each inner and outer tube has four vertical rows of elliptical holes.

[0012] Furthermore, both the inner and outer tubes are rigid PVC pipes, and both the inner and outer seepage holes are formed by hot punching. After hot-melt drilling, the burrs generated during the drilling process of the outer seepage holes are scraped off.

[0013] Furthermore, the bottom of the outer tube has a slanted cut to facilitate insertion of the outer tube into the sand.

[0014] Compared with existing technologies, this utility model provides a drip irrigation device for forest trees that prevents water from seeping vertically down sandy soil and has an adjustable infiltration range, offering the following advantages: In this invention, by installing a distribution pipe with a closed bottom and seepage holes on the sides below the dripper, the drip irrigation water changes from a single-hole, downward-flowing flow to a horizontal seepage flow along multiple transverse seepage holes. The water flow velocity from each seepage hole is almost zero, and the seeping water is completely absorbed by the soil before it can form a macroscopic water body (due to the significant influence of gravity), thus minimizing the impact of gravity. The water tends to diffuse horizontally around the outer pipe, preventing it from seeping vertically into areas unusable by tree roots. Furthermore, since the seepage holes are formed by the overlapping of inner and outer seepage holes, their size can be adjusted by rotating the inner pipe to create different diffusion ranges, adapting to different types of trees and facilitating cleaning after use (in the case of naturally small holes, sand is difficult to remove if trapped inside, but here the inner and outer seepage holes are large, and the small holes are formed by changing the overlapping area). Attached Figure Description

[0015] Figure 1 This is an exploded view of the structure of a drip irrigation device for trees that prevents water from seeping vertically down the sand and has an adjustable seepage range, according to the present invention. Figure 2 This is a schematic diagram showing the relative positions of the external and internal seepage holes during drip irrigation. In the diagram, 1-drip irrigation capillary tube, 2-drip head, 3-inner tube, 31-inner seepage hole, 32-fastening crack, 4-outer tube, 41-outer seepage hole. Detailed Implementation

[0016] like Figure 1 As shown, a tree drip irrigation device that prevents water from seeping vertically down the sand and has an adjustable infiltration range is provided. Each tree drip irrigation device includes a dripper 2 connected to a drip irrigation capillary 1 via a conduit, and a distribution pipe for allowing water to seep horizontally into the soil. The distribution pipe includes an inner pipe 3 and an outer pipe 4. Both the inner pipe 3 and the outer pipe 4 are rigid pipes with open tops and sealed bottoms. The inner pipe 3 is inserted into the outer pipe 4 and fits tightly against the outer pipe 4. There must be no gap between the inner pipe 3 and the outer pipe 4 that would allow the inner pipe 3 to move significantly within it; otherwise, sand entering the gap will cause severe wear and will also hinder water seepage.

[0017] like Figure 2 As shown, the inner tube 3 has multiple vertical rows of internal seepage holes 31 evenly distributed on its side wall, and the outer tube 4 has multiple vertical rows of external seepage holes 41 evenly distributed on its side wall. The internal seepage holes 31 and the external seepage holes 41 correspond one-to-one, are the same size, and are aligned with each other. The inner tube 3 can rotate along the central axis in the outer tube 4 and is equipped with a locking device for locking the rotation. The inner tube 3 is rotatable, which changes the area of ​​the overlapping portion between the inner seepage hole 31 and the outer seepage hole 41, allowing water to seep out only from the overlapping portion. This allows adjustment of the hole size, thereby regulating the seepage range. Furthermore, after use, cleaning is convenient; simply pull out the inner tube 3. Since both the inner seepage hole 31 and the outer seepage hole 41 are much larger than sand, they will not be clogged by sand and can be easily rinsed with water.

[0018] When drip irrigating trees, the drip irrigation device is set around the trees. The locking device locks the inner tube 3 in a state where the inner seepage hole 31 is partially aligned with the outer seepage hole 41. The outer tube 4 is vertically inserted into the sand, and the dripper 2 is inserted into the inner tube 3.

[0019] Unlike the practice of using a large number of small-flow drippers, under normal circumstances, when using this utility model for drip irrigation of trees, only four of these utility models need to be installed per tree.

[0020] The inner tube 3 has a fastening slit 32 extending downward from the top side to allow the top of the inner tube 3 to be expanded. The locking device includes a drip tip 2 and a fastening slit 32. The outer diameter of the part of the drip tip 2 inserted into the inner tube 3 is larger than the inner diameter of the inner tube 3. After being inserted into the inner tube 3, the drip tip 2 expands the inner tube 3 and squeezes the inner tube 3 onto the outer tube 4 to lock the rotation of the inner tube 3.

[0021] This structure facilitates use and prevents mistaken assumptions. The dropper 2 itself is structurally similar to a bottle stopper. After adjustment, inserting the dropper 2 will lock the inner tube 3 in place. In other words, locking is completed during assembly, without requiring a separate step and ensuring nothing is missed. Note that the length of the fastening slit 32 should be approximately equal to or slightly shorter than the portion of the dropper 2 that can be inserted into the inner tube 3.

[0022] In this embodiment, both the inner seepage hole 31 and the outer seepage hole 41 are elliptical holes with their major axes set horizontally, and each inner tube 3 and outer tube 4 has four vertical rows of elliptical holes.

[0023] The minor axis length of the elliptical hole should generally be 1-2mm. It should not be too small, otherwise it will easily be blocked by sand.

[0024] Both the inner tube 3 and the outer tube 4 are rigid PVC pipes. The inner seepage hole 31 and the outer seepage hole 41 are both holes formed by hot punching. After hot melting drilling, the burrs generated during the drilling process of the outer seepage hole 41 are scraped off.

[0025] In this embodiment, the required components are temporarily processed manually. Hot punching involves using a round steel bar that has been hammered flat and heated until red-hot (resulting in an elliptical cross-section) to create an elliptical hole in the PVC pipe from the outside in. This process produces burrs, which need to be scraped off with a steel pipe or rebar to prevent burrs from appearing between the outer tube 4 and the inner tube 3. Alternatively, a finer electric drill can be used to drill a hole and then tear it horizontally to form an elliptical hole, but this method is less efficient. If further development is needed, automated hot punching processes are available for industrial production lines.

[0026] In this embodiment, the bottom of the outer tube 4 has a slanted cut to facilitate insertion of the outer tube 4 into the sand. This is not necessary, as the sand is relatively soft, and this operation is only required when the outer tube 4 is very long.

[0027] This utility model discloses a drip irrigation device for forest trees that prevents water from seeping vertically down sandy soil and has an adjustable infiltration range. Its usage method includes the following steps: Step 1: Install drip irrigation capillary tubes 1 and drip irrigation heads around the trees; Step 2: Insert the inner tube 3 into the outer tube 4, and rotate the inner tube 3 to adjust the overlap area between the inner seepage hole 31 and the outer seepage hole 41. For most trees, an overlap area of ​​1 square millimeter between a single inner seepage hole 31 and a single outer seepage hole 41 is suitable. If the tree is small, the overlap area can be increased. If the tree is large, the overlap area should be reduced and additional of these two types of structures should be added (for example, if the diameter at breast height of the tree exceeds 8 cm, then 6-8 of these two types of structures should be added to each tree). Step 3: Insert the dripper 2 into the inner tube 3, and then insert the outer tube 4 into the sand; Step 4: Begin drip irrigation.

[0028] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A drip irrigation system for trees that prevents water from seeping vertically down sandy soil and has an adjustable infiltration range, each drip irrigation system comprising a dripper (2) connected to a drip irrigation capillary (1) via a conduit, characterized in that: It also includes a distribution pipe for allowing water to permeate laterally in the soil, the distribution pipe comprising an inner pipe (3) and an outer pipe (4), both of which are rigid pipes with open tops and sealed bottoms, the inner pipe (3) being inserted into the outer pipe (4) and fitting tightly against the outer pipe (4); The inner tube (3) has a plurality of vertically arranged internal seepage holes (31) evenly opened on its side wall, and the outer tube (4) has a plurality of vertically arranged external seepage holes (41) evenly opened on its side wall. The internal seepage holes (31) and the external seepage holes (41) correspond one to one, are the same size, and are aligned with each other. The inner tube (3) can rotate along the central axis in the outer tube (4) and is equipped with a locking device for locking the rotation. When drip irrigating trees, the drip irrigation device is set around the trees. The locking device locks the inner tube (3) in a state where the inner seepage hole (31) is partially aligned with the outer seepage hole (41). The outer tube (4) is vertically inserted into the sand, and the dripper (2) is inserted into the inner tube (3).

2. A drip irrigation device for trees according to claim 1, which prevents water from seeping vertically down sandy soil and has an adjustable infiltration range, characterized in that: The inner tube (3) has a fastening slit (32) extending downward from the top of the side, which is used to expand the top of the inner tube (3). The locking device includes a drip head (2) and a fastening slit (32). The outer diameter of the part of the drip head (2) inserted into the inner tube (3) is larger than the inner diameter of the inner tube (3), and expands the inner tube (3) after being inserted into the inner tube (3), squeezing the inner tube (3) onto the outer tube (4) to lock the rotation of the inner tube (3).

3. A drip irrigation device for forest trees according to claim 1, which prevents water from seeping vertically down sandy soil and has an adjustable infiltration range, characterized in that: The inner seepage hole (31) and the outer seepage hole (41) are both elliptical holes with their long axes set horizontally. Each inner tube (3) and outer tube (4) has four vertical rows of elliptical holes.

4. A drip irrigation device for forest trees according to claim 3, which prevents water from seeping vertically down the sand and has an adjustable infiltration range, characterized in that: The inner tube (3) and the outer tube (4) are both rigid PVC pipes. The inner seepage hole (31) and the outer seepage hole (41) are both holes formed by hot punching. After hot melting drilling, the burrs generated in the outer seepage hole (41) during the drilling process are scraped off.

5. A drip irrigation device for forest trees according to claim 1, which prevents water from seeping vertically down sandy soil and has an adjustable infiltration range, characterized in that: The bottom of the outer tube (4) has a slanted cut to facilitate insertion of the outer tube (4) into the sand.

Images