Anti-blocking structure of underground drip irrigation pipe of wheat irrigation device

Abstract

The utility model provides a kind of underground drip irrigation pipe anti-blocking structure of wheat irrigation device belongs to agricultural irrigation technical field, the underground drip irrigation pipe anti-blocking structure of this wheat irrigation device, shell, spiral groove and rotating mechanism, shell is cylindrical structure, for guiding water flow direction, bottom is equipped with spiral groove, spiral groove is integrally formed with shell, for further guiding water flow direction, rotating mechanism is located at the top of shell, for shell and water pipe movably connected;Rotating mechanism is bearing structure, the top of shell is the outer ring of bearing, the inner ring of bearing is fixed at water pipe drip irrigation outlet, outer ring and inner ring contact place is equipped with a circular cross section ring belt recess, ring belt recess inside is equipped with the stainless steel ball for fixed and reduce friction;The utility model can reduce the possibility that underground drip irrigation pipe is blocked when drip irrigation, improve drip irrigation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural irrigation technology, and specifically relates to an anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device. Background Technology

[0002] Subsurface drip irrigation technology, by burying the drippers in the root zone, allows for direct water infiltration, significantly reducing soil surface evaporation and inter-row evaporation, and is considered an ideal means of water-saving and yield-increasing for wheat in arid regions. However, the cross-section of the dripper channel is typically on the millimeter scale. Once buried in the soil, it faces complex interactions at the solid-liquid-gas three-phase interface: when water is stopped, negative pressure forms around the drip holes, causing soil particles to flow back with the capillary water; when water is supplied again, the backflowing particles deposit and bridge within the channel, gradually evolving into a dense filter cake. Traditional embedded plate-shaped, labyrinthine tooth-shaped, or microporous outlets all rely on small local narrowing to dissipate energy. The narrowing point also becomes a clogging-sensitive point; any particle with a diameter close to or slightly larger than the narrowing size can trigger "Kármán"-level blockage, leading to uneven irrigation, crop drought, and even the failure of the entire capillary tube. While existing physical, chemical, and biological control methods can delay clogging, they suffer from drawbacks such as high energy consumption, pesticide residues, ecological risks, and frequent maintenance. As a result, a universally applicable, economically feasible, and environmentally friendly solution at the field scale has not yet been developed. Utility Model Content

[0003] In view of this, the present invention provides an anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device, which can reduce the possibility of blockage of the underground drip irrigation pipes during drip irrigation and improve drip irrigation efficiency.

[0004] This utility model is implemented as follows:

[0005] This utility model provides an anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device, comprising a shell, a spiral groove, and a rotating mechanism. The shell is a cylindrical structure used to guide the direction of water flow. A spiral groove is provided at the bottom and is integrally formed with the shell to further guide the direction of water flow. The rotating mechanism is located at the top of the shell and is used to movably connect the shell to the water pipe.

[0006] The technical effects of the underground drip irrigation pipe anti-clogging structure of the wheat irrigation device provided by this utility model are as follows: the shell cylinder and the integrated spiral groove constrain the falling water flow into a rotating liquid film, and the gravitational potential energy is directly converted into circumferential thrust. The shell can rotate continuously at a low speed without the need for external power, dynamically peeling off the newly attached mud particles, blocking the budding of blockage, and maintaining smooth drip irrigation in the long term.

[0007] Based on the above technical solution, the anti-clogging structure of the underground drip irrigation pipe of the wheat irrigation device of this utility model can be further improved as follows:

[0008] Among them, the spiral groove is a spiral protrusion structure at the bottom of the shell, with multiple protrusions evenly distributed at the bottom of the shell.

[0009] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the evenly distributed multi-line spiral protrusions at the bottom make the circumferential thrust evenly distributed along the ring direction, avoiding excessive force at a single point that could lead to uneven bearing wear; at the same time, the multi-channel synchronous mud discharge expands the cleaning zone, prevents local mud accumulation from forming a "bottleneck", and ensures anti-clogging throughout the entire circumference and at all times.

[0010] Furthermore, the cross-section of the spiral groove is trapezoidal.

[0011] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the trapezoidal cross-section is wide at the root and narrow at the top, which not only provides sufficient strength to resist soil pressure, but also allows the water flow to form an acceleration zone at the top, enhancing the shearing and stripping of particles; the trapezoidal slope can also guide the stripped mud particles to the center of the channel and discharge them quickly with the mainstream, reducing secondary deposition.

[0012] Furthermore, the rotating mechanism is a bearing structure, with the outer ring of the bearing at the top of the housing and the inner ring of the bearing fixed at the drip irrigation outlet of the water pipe. A circular cross-section recess is provided at the contact point between the outer ring and the inner ring, and a stainless steel ball for fixing and reducing friction is provided inside the recess.

[0013] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the outer ring of the bearing is integrated with the housing, and the inner ring is fixed to the water pipe, forming a unique rotating pair; the ring groove and the stainless steel ball achieve rolling friction, the starting torque is extremely small, and the weak gravity water head can drive the housing to rotate, ensuring that it can "not stop" and self-clean during the intermittent dripping stage.

[0014] Furthermore, the radius of the outer ring at the top of the shell is larger than the radius at the bottom of the shell.

[0015] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the top of the shell is expanded outward into an inverted cone, forming a wedge-shaped self-locking with the soil, which can counteract the slow sinking or tilting caused by the rotational reaction force, maintain a constant depth of the drip irrigation outlet, avoid the shell displacement leading to local water accumulation and siltation, and maintain long-term uniform irrigation.

[0016] Furthermore, the top of the spiral groove cross-section has a parabolic structure.

[0017] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the parabolic transition at the top of the spiral channel weakens water flow separation, reduces turbulent dissipation, and allows more gravitational potential energy to be used to generate effective torque; at the same time, the smooth surface reduces mud particle impact and crushing, inhibits the generation of secondary fine particles, and reduces the risk of blockage from the source.

[0018] Furthermore, the angle between the top of the spiral groove section and the shell is 30° to 60°.

[0019] The beneficial effects of adopting the above-mentioned improved scheme are: the 30° to 60° included angle range takes into account both tangential thrust and axial flow velocity, ensuring sufficient torque to drive the shell while avoiding excessive steepness that would cause a sudden drop in flow velocity and particle fall; the angle can be adjusted according to soil texture, broadening the applicability of the device and maintaining high efficiency and self-cleaning.

[0020] Furthermore, the angle between the top of the spiral groove section and the shell is 45°.

[0021] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the 45° included angle is the optimal compromise, making the circumferential and axial forces similar in magnitude, balancing the distribution of rotational and water conveyance energy consumption, achieving the maximum sludge discharge efficiency under the same water head, and ensuring the most stable long-term operation, making it a plug-and-play anti-clogging angle that requires no debugging.

[0022] Furthermore, the inner diameter of the housing is equal to the diameter of the inner wall of the inner ring of the rotating mechanism.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the inner wall of the shell is the same diameter as the inner ring of the bearing, forming a completely smooth flow channel, eliminating the low-speed dead angle caused by the steps, and preventing mud particles from accumulating in the steps; the water flow is continuously accelerated, ensuring that the stripped impurities are carried away instantly, maintaining the long-term cleanliness of the inner cavity.

[0024] Furthermore, the pitch of the spiral groove is equal to the bottom inner diameter of the shell.

[0025] The beneficial effects of adopting the above-mentioned improved scheme are as follows: the pitch is equal to the bottom inner diameter to form a "one-to-one" self-similar geometry, the flow channel curvature is constant, the velocity distribution remains unchanged along the flow path, and particle deposition caused by local over-expansion or sudden contraction is avoided; the maximum agglomerate can pass through any cross section, theoretically achieving zero blockage.

[0026] Compared with existing technologies, the beneficial effects of the anti-clogging structure for underground drip irrigation pipes in this invention are as follows: The anti-clogging structure designs the shell as a cylinder and integrally arranges spiral protrusions at its bottom, allowing the water flow to acquire a tangential velocity under gravity. This tangential velocity directly drives the shell to rotate continuously and smoothly at a low speed relative to the fixed water pipe, thereby throwing soil particles about to be deposited around the drip irrigation outlet outwards, forming a dynamic self-cleaning effect. Since the rotational power comes from the potential energy of the irrigation water itself, no external motor, micro-turbine, or elastic element is required, significantly reducing system complexity. Even when buried in high-humidity, high-salt, and high-microbial-activity soil environments for extended periods, there are no issues such as circuit failure or material fatigue, fundamentally improving the service reliability of underground drip irrigation equipment.

[0027] The spiral channel's cross-section is constrained to a trapezoidal shape, transitioning to a parabolic shape at the top, balancing the dual requirements of rigidity and wear resistance with streamlined drag reduction. The trapezoidal bottom provides a wide support surface, ensuring the channel's geometric stability under cyclic earth pressure; the parabolic top weakens water flow separation, reduces local turbulence intensity, and minimizes energy dissipation. The angle between the channel and the shell axis is preferably 45 degrees, generating maximum torque at the same flow rate while avoiding excessively steep angles that cause a sudden drop in flow velocity or excessively slow angles that result in insufficient rotation, achieving an optimal match between water conveyance efficiency and self-cleaning capability.

[0028] The rotating mechanism employs an all-metal sealed bearing system. The outer ring is integrally formed with the top of the housing, while the inner ring is rigidly connected to the water pipe outlet. The two rings form multi-point rolling contact with the stainless steel balls via a circular track. This design integrates axial sealing and rotational support functions into a single component, preventing sediment from intruding into the bearing along the axial clearance and utilizing the low-damping characteristics of rolling friction to ensure the housing can start rotating even under low water head. The track cross-section is circular, allowing the stainless steel balls to adaptively fine-tune the contact points under uneven soil pressure, avoiding localized stress concentration and premature wear, significantly extending the maintenance-free period for buried installations.

[0029] The outer diameter of the top of the shell expands to 1.2 to 1.4 times the inner diameter of the bottom, forming an inverted conical transition section. This inverted conical section forms a wedge-shaped self-locking mechanism with the surrounding soil during installation, resisting the slow loosening tendency caused by rotational reaction force and maintaining a constant drip irrigation outlet depth. Simultaneously, the enlarged inner cavity provides a brief retention space for the rotating water flow, allowing fine particles that have not yet been ejected to settle again at the root of the irrigation trench under centrifugal force and be carried away by subsequent water flow, further improving sludge removal efficiency. The uniform diameter design of the inner wall throughout eliminates abrupt changes in cross-section, reduces head loss, and ensures that the irrigation uniformity at the far end remains unaffected.

[0030] The pitch of the spiral groove is set to be equal to the inner diameter of the bottom of the shell, so that the axial advance distance per turn is in a one-to-one relationship with the diameter of the flow channel. The water completes one axial transport per revolution, forming a continuous sludge discharge flow pattern similar to a spiral pump. This ratio avoids both excessively high axial velocity and insufficient tangential velocity caused by an excessively large pitch, and the risk of clogging caused by an excessively small pitch, ensuring stable self-cleaning circulation under different soil textures and irrigation water qualities. The entire structure has no vulnerable membrane and no micro-hole throttling, and the minimum size of the flow channel is larger than the aggregate diameter of common soil particles, fundamentally eliminating the persistent problem of traditional drip irrigation systems failing due to micro-hole clogging. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of an anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device;

[0033] Figure 2 A cross-sectional view of an anti-clogging structure for an underground drip irrigation pipe in a wheat irrigation device;

[0034] Figure 3 A top view of an anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device;

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 1. Housing; 2. Spiral groove; 3. Rotating mechanism. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0038] like Figures 1-3 The image shows a first embodiment of an anti-clogging structure for an underground drip irrigation pipe in a wheat irrigation device provided by this utility model. In this embodiment, there is a shell 1, a spiral groove 2, and a rotating mechanism 3. The shell 1 is a cylindrical structure used to guide the direction of water flow. The bottom is provided with a spiral groove 2, which is integrally formed with the shell 1 to further guide the direction of water flow. The rotating mechanism 3 is located at the top of the shell 1 and is used to movably connect the shell 1 to the water pipe.

[0039] In the above technical solution, the spiral groove 2 is a spiral protrusion structure at the bottom of the shell 1, and there are multiple protrusions that are evenly distributed at the bottom of the shell 1.

[0040] Furthermore, in the above technical solution, the cross-section of the spiral groove 2 is a trapezoidal structure.

[0041] Furthermore, in the above technical solution, the rotating mechanism 3 is a bearing structure, the top of the housing 1 is the outer ring of the bearing, the inner ring of the bearing is fixed at the drip irrigation outlet of the water pipe, and a circular cross-section ring groove is provided at the contact point between the outer ring and the inner ring. The ring groove is provided with stainless steel balls for fixing and reducing friction.

[0042] Furthermore, in the above technical solution, the radius of the outer ring at the top of the housing 1 is greater than the radius of the bottom of the housing 1.

[0043] Furthermore, in the above technical solution, the top of the spiral groove 2 section has a parabolic structure.

[0044] Furthermore, in the above technical solution, the inner wall diameter of the housing 1 is equal to the inner wall diameter of the inner ring of the rotating mechanism 3.

[0045] Furthermore, in the above technical solution, the pitch of the spiral groove 2 is equal to the bottom inner diameter of the shell 1.

[0046] The present invention provides a first embodiment of an anti-clogging structure for underground drip irrigation pipes of a wheat irrigation device. In this embodiment, there is a shell 1, a spiral groove 2, and a rotating mechanism 3. The shell 1 is a cylindrical structure used to guide the direction of water flow. The bottom is provided with a spiral groove 2, which is integrally formed with the shell 1 to further guide the direction of water flow. The rotating mechanism 3 is located at the top of the shell 1 and is used to movably connect the shell 1 to the water pipe.

[0047] In the above technical solution, the spiral groove 2 is a spiral protrusion structure at the bottom of the shell 1, and there are multiple protrusions that are evenly distributed at the bottom of the shell 1.

[0048] Furthermore, in the above technical solution, the cross-section of the spiral groove 2 is a trapezoidal structure.

[0049] Furthermore, in the above technical solution, the rotating mechanism 3 is a bearing structure, the top of the housing 1 is the outer ring of the bearing, the inner ring of the bearing is fixed at the drip irrigation outlet of the water pipe, and a circular cross-section ring groove is provided at the contact point between the outer ring and the inner ring. The ring groove is provided with stainless steel balls for fixing and reducing friction.

[0050] Furthermore, in the above technical solution, the radius of the outer ring at the top of the housing 1 is greater than the radius of the bottom of the housing 1.

[0051] Furthermore, in the above technical solution, the angle between the top of the spiral groove 2 section and the shell 1 is 30° to 60°.

[0052] Furthermore, in the above technical solution, the angle between the top of the spiral groove 2 and the shell 1 is 45°.

[0053] Furthermore, in the above technical solution, the inner wall diameter of the housing 1 is equal to the inner wall diameter of the inner ring of the rotating mechanism 3.

[0054] Furthermore, in the above technical solution, the pitch of the spiral groove 2 is equal to the bottom inner diameter of the shell 1.

[0055] The following is a specific application scenario of this device: In the loamy alluvial plain of the Yellow River, underground drip irrigation is commonly used to replenish soil moisture during the winter wheat greening period. However, the high silt content in the topsoil and the alternating wind and drought in spring cause the soil structure to collapse instantly. Traditional embedded drip irrigation tapes often result in strip-shaped seedling wilting due to outlet blockage in the early stages of irrigation. This anti-blockage structure is buried under the surface of the ridge side in the form of a single-hole unit at the end of the branch pipe. The drip irrigation outlet is fixed to the inner ring of the shell, and the entire shell is placed in a small cylindrical enlarged hole, backfilled with the original soil and lightly compacted. When irrigation water enters the shell along the branch pipe, the gravitational potential energy drives the water flow to accelerate tangentially along the spiral groove. The shell then rotates at a low speed, and the direction of rotation matches the helix angle. This causes the soil particles tightly attached to the outer wall of the shell to be subjected to continuous shearing action, preventing the formation of a static filter cake. This ensures that the first irrigation of spring can achieve uniform outflow across the entire field, avoiding drought and yield reduction during the seedling stage.

[0056] Under conditions of full corn stalk return to the field, organic patches and dust particles in the topsoil easily mix to form dense flocs, which often become bridged and blocked by the slightly larger diameter flocs in conventional drip irrigation systems. The multi-line spiral protrusions of this device expand the minimum hydraulic diameter of the flow channel to above the maximum particle size of the agglomerates, while the trapezoidal cross-section at the root provides sufficient strength to safely pass through complex solid-liquid mixtures mixed with chopped straw. The parabolic top surface weakens turbulent bursts, reducing the probability of floc impact and breakage, and preventing secondary blockage by fine particles. During the rotation of the shell, the outer edge of the spiral groove slightly cuts the soil, forming a ring-shaped loose zone around the outlet. This loose zone has significantly higher permeability than the undisturbed soil further away. After irrigation stops, pore water quickly radiates outwards and dissipates, preventing further deterioration of the soil structure due to long-term saturation, thus maintaining a good permeable environment for the subsequent root development of summer corn.

[0057] The groundwater salinity in this area increases seasonally, and traditional rubber-shielded bearings are prone to hardening and cracking under the synergistic effects of salt, alkali, and oxygen, losing their sealing and rotational functions. This device uses all-metal rolling bearings. The passivation film on the surface of the stainless steel balls maintains a low corrosion rate in high-salt environments. The concave ring and lip form a non-contact labyrinth, preventing saline water from entering the raceway. The outwardly flared inverted cone at the top of the shell forms a wedge-shaped self-locking mechanism with the damp soil, resisting the micro-vibration and settlement caused by spring winds during irrigation, ensuring that the shell axis is coaxial with the branch pipes, and avoiding eccentric wear. Years of field observation have shown that this structure maintains a low starting torque even under continuous irrigation with saline water, and the shell rotates with every irrigation, with no record of rust or jamming. This significantly reduces the risk of sudden blockages due to bearing failure, providing reliable hardware support for stable grain production in the Yellow River Plain.

[0058] From a farm management perspective, the integrated design of this device eliminates the need for fragile films and annual recycling, reducing the manual labor required for the conventional drip irrigation tape "lay-collect-inspection" process. The rotating shell's sludge-removing effect allows the irrigation system to operate at lower pressures, thus reducing pump station energy consumption and aligning with regional water conservation and emission reduction policies. Farmers only need to check the shell's rotational flexibility via quick-connect fittings before sowing, eliminating the need for per-hole inspection and significantly improving maintenance efficiency. Demonstration results in this scenario show that winter wheat emergence rate, plant height uniformity, and yield are all superior to traditional drip irrigation treatments, and there is no significant salt accumulation layer in the soil profile, fully validating the broad applicability of the anti-clogging structure in the high-silt, high-mineralization, and high-organic-residue environment of the Yellow River alluvial plain.

[0059] The following is another specific application scenario of this device: The Tarim Basin has an extremely arid climate, and spring wheat relies on high-frequency drip irrigation under film to maintain root zone moisture during its growth period. However, the aeolian sandy soil in the basin has simple particles and no structure. In addition, the temperature difference between the films is large, and the drip irrigation outlet is prone to dense blockage due to the alternating deposition of "sand particles and water vapor", resulting in drought spots under the film and directly affecting ear differentiation. This anti-blocking structure is integrated into the capillary tube outlet in a patch manner. The outer ring at the top of the shell is clamped in the inner sleeve of the polyethylene branch pipe, and the bottom penetrates into the sand layer. When the high-frequency pulse irrigation is started, gravity water enters the sand body tangentially along the spiral groove. The shell then rotates, and the rotational motion forms a local shear zone in the sand, which breaks the "sand-water-air" interface that is about to harden, so that the moistening front is kept to advance evenly. This avoids the dominant flow channel caused by traditional point source water accumulation, thereby ensuring that the sand layer under the film is uniformly moistened and promoting early tillering of spring wheat.

[0060] In desert fringe areas, water sources are mostly a mixture of wells and canals, carrying small amounts of aeolian silt and iron oxide flocculents. These particles are highly hard, exhibiting both abrasive and clogging effects on traditional plastic perforated membranes. This device utilizes a trapezoidal cross-section in its spiral groove, transitioning to a parabola at the top. Hard particles are lifted by the water flow within the groove and slide along the parabolic surface, reducing head-on impact. The wide groove root allows particles to roll through, preventing jamming. As the casing rotates, the outer edge of the groove creates a "spiral pump" effect on the surrounding sand particles, re-entraining the deposited silt and diffusing it with the water flow towards the outer edge of the membrane, forming a self-cleaning cycle. The stainless steel balls in the rolling bearings maintain a low coefficient of friction even in the high-hardness particle environment, ensuring the casing does not experience a starting "dead point" under high-frequency start-stop conditions, maintaining a state of rotation with each filling cycle, and significantly extending the system's clog-free operating cycle.

[0061] In the Tarim Irrigation District, summer surface temperatures are extremely high. Conventional rubber seals are prone to thermal and oxidative aging, losing elasticity and allowing silt to directly penetrate the bearings, causing them to seize. This device features a metal labyrinth seal without an elastomer, which is resistant to high temperatures and ultraviolet radiation. The outer diameter of the top of the shell is larger than that of the bottom, forming an inverted umbrella-shaped sunshade surface, reducing the temperature rise of the bearing cavity caused by direct sunlight, while preventing water accumulation on the membrane from seeping into the soil along the outer wall of the shell, thus avoiding uncontrolled humidity under the membrane. The inverted conical structure also forms a self-locking mechanism with the sand particles, resisting displacement caused by thermal expansion and contraction due to diurnal temperature differences, keeping the shell and branch pipes coaxial, and avoiding drip drift caused by eccentric wear. This provides stable hardware support for high-frequency, low-volume irrigation in extremely arid areas.

[0062] In production practice, this anti-clogging structure allows the drip irrigation system under film to achieve its designed flow rate at lower operating pressure, reducing pump head and simultaneously decreasing diesel consumption, thus lowering both production costs and carbon emissions. The shell requires no recycling or replacement, solving the problems of tearing and sand accumulation during annual recycling of drip irrigation tape in sandy areas. Multi-point field monitoring shows excellent performance in spring wheat population growth curves, leaf area index, and yield components. No drought spots were observed under the film, and the sand profile showed no significant salt accumulation or compaction after harvest. This verifies the reliability and ecological safety of the device under extreme drought, high abrasion, and high salinity environments, providing a replicable water and fertilizer integration technology paradigm for improving grain production capacity on the edge of the southern Xinjiang desert.

[0063] Specifically, the principle of this invention is as follows: when the underground drip irrigation water flows out of the outlet, its potential energy has not been completely dissipated, and it still retains a usable residual head. This device has continuous spiral protrusions at the bottom of the shell, causing the cross-section of the flow channel to change periodically along the circumference. When the water reaches the starting point of the spiral, the cross-section of the flow channel suddenly narrows, the flow velocity increases, and the static pressure decreases; subsequently, the cross-section gradually expands along the spiral direction, the flow velocity decreases, and some kinetic energy is converted back into pressure energy. This process repeats within each spiral pitch, forming a pressure gradient along the spiral line. Because there is a fixed angle between the spiral surface and the shell axis, the pressure gradient is decomposed into axial thrust and circumferential shear force; the shear force generates a torque on the shell, which, after overcoming the rolling friction of the bearings and the lateral constraints of the soil, drives the shell to rotate continuously at a low speed around its longitudinal axis. The entire energy conversion chain relies only on gravitational potential energy, requiring no external power input, achieving a self-excited effect of "exchanging hydraulic power for rotation".

[0064] After the shell rotates, a relative shearing motion occurs between its outer surface and the surrounding soil. In traditional drip irrigation systems, the fine particles gradually adhere to the periphery of the outlet under capillary suction and chemical flocculation, eventually clogging the microchannels. In this structure, although the linear velocity of the shell surface is low, it is sufficient to disrupt the forming static filter cake, keeping the particles in a dynamic cycle of "being stripped—resuspended—migrating with water." The root of the spiral channel generates instantaneous low pressure due to cross-sectional expansion, forming a local vortex that can draw the stripped particles into the main channel and discharge them from the affected area with the mainstream. Because the parabolic shape of the channel top reduces the water separation zone, the vortex intensity is controlled within a range that can both pick up particles and prevent serious head loss, achieving compatibility between efficient sludge removal and low-energy water conveyance.

[0065] The rotating mechanism employs a rolling bearing configuration with inner and outer rings and stainless steel balls. The inner ring is fixedly connected to the water pipe outlet, while the outer ring is integrally formed with the housing, creating a unique rotation interface. The circular cross-section of the ring's recess forms four-point contact with the balls, providing both radial positioning and bearing axial thrust. The rolling friction coefficient at the contact points is significantly lower than that of the sliding pair, ensuring startup even with minimal water head. Micro-scale lips are provided on both sides of the recess, utilizing elastic deformation and soil back pressure to form a non-contact labyrinth seal, preventing external mud and water from entering the raceway. The stainless steel balls themselves possess a passivation film, maintaining a low corrosion rate even in high-salt, high-chloride environments, and sustaining low frictional torque over the long term. This ensures that the housing can rotate slowly even during irrigation breaks due to micro-seepage caused by changes in soil moisture, preventing jamming failure caused by "shutdown corrosion."

[0066] The pitch of the spiral groove is set to be equal to the inner diameter of the bottom of the shell, forming a self-similar geometry of "radius-axis 1:1". This ratio ensures that the flow channel maintains the same local curvature and expansion angle at any axial position, and the ratio of water flow inertial force to viscosity remains constant along the flow path, avoiding particle deposition preference caused by excessively steep or gentle local slopes. The trapezoidal cross-section provides a wide root, allowing larger aggregates to pass through; the parabolic transition at the top suppresses turbulent bursts, reduces particle impact energy, and minimizes the generation of fine particles after secondary breakup. Due to the absence of abrupt changes in cross-sectional area throughout the flow path, the minimum hydraulic diameter of the flow channel is always greater than the maximum particle size of common soil aggregates, theoretically eliminating the risk of "Kármán-level" clogging, fundamentally solving the structural defect of easy clogging of micropores in traditional drip irrigation systems.

Claims

1. An anti-clogging structure of an underground drip irrigation pipe of a wheat irrigation device, characterized in that, The system comprises a shell, a spiral groove, and a rotating mechanism. The shell is a cylindrical structure used to guide the direction of water flow. The bottom is provided with a spiral groove, which is integrally formed with the shell to further guide the direction of water flow. The rotating mechanism is located at the top of the shell and is used to movably connect the shell to the water pipe.

2. A clogging prevention structure for an underground drip irrigation pipe of a wheat irrigation device according to claim 1, characterized in that, The spiral groove is a spiral protrusion structure at the bottom of the shell, with multiple protrusions evenly distributed at the bottom of the shell.

3. The anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device according to claim 2, characterized in that, The cross-section of the spiral groove is trapezoidal.

4. The anti-clogging structure of the underground drip irrigation pipe of the wheat irrigation device according to claim 3, characterized in that, The rotating mechanism is a bearing structure. The top of the housing is the outer ring of the bearing, and the inner ring of the bearing is fixed at the drip irrigation outlet of the water pipe. At the contact point between the outer ring and the inner ring, there is a circular cross-section recessed ring. The inside of the recessed ring is a stainless steel ball for fixing and reducing friction.

5. The anti-clogging structure of the underground drip irrigation pipe of the wheat irrigation device according to claim 4, characterized in that, The radius of the outer ring at the top of the shell is greater than the radius at the bottom of the shell.

6. The anti-clogging structure of the underground drip irrigation pipe of the wheat irrigation device according to claim 5, characterized in that, The top of the spiral groove cross-section has a parabolic structure.

7. The anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device according to claim 6, characterized in that, The angle between the top of the spiral groove section and the shell is 30° to 60°.

8. The anti-clogging structure of the underground drip irrigation pipe of the wheat irrigation device according to claim 7, characterized in that, The angle between the top of the spiral groove section and the shell is 45°.

9. The anti-clogging structure for underground drip irrigation pipes in a wheat irrigation device according to claim 8, characterized in that, The inner diameter of the housing is equal to the diameter of the inner ring of the rotating mechanism.

10. The anti-clogging structure for underground drip irrigation pipe of a wheat irrigation device according to claim 9, characterized in that, The pitch of the spiral groove is equal to the bottom inner diameter of the shell.

Images