Self-ventilation type tree ventilation device

Abstract

The utility model relates to the technical field of landscaping, in particular to a self-ventilation type tree ventilation device which comprises a vertical pipe, a transverse pipe, an unpowered hood, a butterfly valve and a ventilation hole protection layer. The vertical pipe and the transverse pipe are made of PVC materials, the length of the vertical pipe is 1-1.5 m, the inner diameter of the vertical pipe is 10-15 cm, the length of the transverse pipe is determined by the projection of the crown breadth, and the inner diameter of the transverse pipe is The vertical pipe and the transverse pipe are connected through a three-way pipe connector, and the unpowered hood is installed at the top end of the vertical pipe and controlled to be opened and closed through a butterfly valve. The air hole protection layer is a plastic gauze element and wraps the outer walls of the vertical pipes and the transverse pipes, and it is guaranteed that the air holes are not blocked by soil particles. Natural wind speed can be utilized to promote air convection inside and outside the soil, root respiration is ensured, the problem of unsmooth root respiration caused by urban soil hardening is solved, water and fertilizer management is facilitated, and the workload of water and fertilizer management is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of gardening and greening, in particular to a self-ventilating tree ventilation device. Background Art

[0002] With the continuous development of urban greening and garden construction, the importance of tree ventilation systems has become increasingly prominent. However, the existing technology has many problems in practical applications. First of all, the traditional tree ventilation pipe system lacks flexibility due to the use of fixed-length pipes. It is difficult to adapt to the planting depth of trees of different specifications, resulting in high loss and low adaptability. Although there have been attempts to improve flexibility by designing ventilation pipe systems with adjustable lengths, such as the "Tree Root Ventilation Pipe Group System" of CN212344631U, its physical plug-in connection method is prone to unstable connection and decreased ventilation performance in long-term use. In addition, although the "Tree Pipe and Tree Pit Pipe System" of CN209619968U solves the ventilation and drainage problems, its fixed filter mechanism is difficult to adjust according to changes in soil conditions and is prone to clogging, affecting the effect.

[0003] Further problems include: ancient trees and large landscape trees are affected by soil compaction and poor air permeability and water permeability, which affect the respiration and growth of their roots; existing technologies such as vertical drilling and installation of PVC ventilation pipes have limited gas exchange efficiency, especially when the air pressure is stable; traditional ventilation pipes have limited water storage and water diffusion capabilities during irrigation and need to be densely installed; when the temperature drops in winter, traditional ventilation pipes will drain the root moisture if they do not have a sealing structure; although filling with mixed matrices such as vermiculite can solve winter problems, it will reduce the ventilation effect of the ventilation pipes, leading to blockage and increased replacement costs; street trees and road green space tree pits have thicker ground pavement, which affects soil air permeability and water permeability; trees on slopes are unable to store water and suffer from long-term drought, which affects their growth potential and causes soil erosion.

[0004] To address these issues, this utility model proposes a self-ventilating tree ventilation device, aiming to overcome the shortcomings of existing technologies and provide a new solution that is intelligent, efficient, and adaptable to changing environments. This device will be able to automatically adjust the flow rate, automatically adjusting the ventilation performance according to soil conditions and tree growth needs, to ensure the healthy growth of tree roots. Utility Model Content

[0005] A self-ventilating tree ventilation device includes a vertical pipe, a horizontal pipe, a non-powered hood, a butterfly valve, and a protective layer of air holes. The vertical pipe is made of PVC and is cylindrical. The vertical pipe length ranges from 1 to 1.5 meters, and the inner diameter is 10 to 15 cm. The top end of the vertical pipe is reserved for 20 cm without air holes. The horizontal pipe is also made of PVC and is cylindrical. The length of the horizontal pipe is determined by the crown projection. When setting up a single tree, the length of the horizontal pipe is approximately equal to the crown diameter. When setting up a connecting tree pit, the length of the connection between the tree pits needs to be added. The inner diameter is 15 to 20 cm. When setting up a single tree, the inner diameter of the horizontal pipe is 15 cm. The more trees in the connecting tree pits, the larger the inner diameter of the horizontal pipe, up to 20 cm. 20 cm is reserved at both ends of the horizontal pipe without air holes. The vertical pipe and the horizontal pipe are connected by a 3-way pipe connector, and the connection method is threaded, screwed, or spliced. The non-powered hood is installed at the top of the vertical pipe and connected to the vertical pipe through a butterfly valve. The butterfly valve is controlled to open and close by a knob. The air vent protection layer is a plastic gauze wrapped around the outer walls of the vertical tube and the horizontal tube to ensure that the air vent is not blocked.

[0006] A further preferred embodiment: a plurality of air holes are provided on the wall of the vertical pipe and the horizontal pipe, the diameter of the air holes is 1-2 cm, each air hole is 5-10 cm apart, and the air holes are distributed in 6 directions. The unpowered hood includes a hood shell, a turbine and a bearing. The hood shell is conical in shape. The turbine is installed inside the hood shell and is rotatably connected to the hood shell through a bearing. The butterfly valve includes a butterfly valve shell, a butterfly plate and a knob. The butterfly valve shell is fixedly connected to the top of the vertical pipe, and the butterfly plate is controlled to open and close by the knob. The air hole protective layer is a plastic mesh wrapped around the outer wall of the vertical pipe and the horizontal pipe to ensure that the air holes are not blocked.

[0007] A further preferred embodiment: The vertical and horizontal pipes are connected with a sealing ring to ensure a tight seal. The bottom of the hood housing of the unpowered hood is provided with a connecting flange, which is connected to the butterfly valve via threads or screws. The butterfly valve disc is provided with a sealing gasket to ensure a tight seal when the disc is closed. The plastic mesh of the air vent protective layer is 0.5-1mm thick and has a mesh diameter of 0.1-0.5mm to ensure that the air vents are not blocked by soil particles.

[0008] A further preferred solution: a reinforcement ring is provided at the connection between the vertical pipe and the horizontal pipe, and the reinforcement ring is fixed to the connection between the vertical pipe and the horizontal pipe by welding or bonding to enhance the strength of the connection. The turbine of the unpowered hood is provided with a plurality of blades, which are distributed in a spiral shape, with 4-8 blades, a blade thickness of 0.5-1mm, and a blade spacing of 1-2cm, to ensure that the turbine can rotate smoothly under the action of natural wind. The knob of the butterfly valve is provided with anti-slip grooves to ensure the anti-slip property of the knob during manual operation. The plastic mesh of the air vent protective layer is provided with a plurality of fixing rings, which are fixed to the plastic mesh by bonding or sewing to ensure the fixity of the plastic mesh during installation.

[0009] A further preferred solution: a positioning pin is provided at the connection between the vertical pipe and the horizontal pipe, and the positioning pin is fixed to the connection between the vertical pipe and the horizontal pipe by plugging, so as to ensure the positioning accuracy of the connection. The top of the hood shell of the non-powered hood is provided with a rainproof cap, which is conical in shape, so as to ensure the rainproof effect of the top of the hood shell. An indicator mark is provided on the butterfly plate of the butterfly valve, and the indicator mark is fixed on the butterfly plate by engraving or spraying, so as to ensure the visualization of the opening and closing status of the butterfly plate. A plurality of air holes are provided on the plastic mesh of the air vent protective layer, and the diameter of the air holes is 1-2 mm, so as to ensure the air permeability of the air holes.

[0010] The structure and operating principle of this utility model are as follows: the vertical and horizontal pipes are connected via a three-way pipe connector, forming a connected ventilation system. Multiple ventilation holes are provided in the walls of the vertical and horizontal pipes, with the holes opening in six directions to ensure uniform distribution and effective ventilation. A protective layer of plastic mesh wraps around the outer walls of the vertical and horizontal pipes to prevent clogging of the holes by soil particles. A non-powered wind cap is mounted on the top of the vertical pipe and connected to the vertical pipe via a butterfly valve, which is controlled by a knob. The wind cap housing of the non-powered wind cap is conical in shape, and a turbine is mounted inside the housing, rotatably connected to the housing via a bearing. The turbine rotates in response to natural wind, discharging internal air and replacing it with outside air. The function of the non-powered wind cap ensures the exchange of air between the tree's ventilation pipe and the outside world. The butterfly valve's disc, controlled by a knob, closes the ventilation pipe when temperatures drop in winter, preventing the roots from being drained of moisture. The joints between the vertical and horizontal pipes are equipped with sealing rings and reinforcement rings to ensure tightness and strength. The bottom of the hood housing of the non-powered hood is equipped with a connecting flange, which connects to the butterfly valve via threads or screws to ensure a secure connection. The butterfly valve disc is equipped with a sealing gasket and indicator mark to ensure tightness when the disc is closed and visually display the open and closed status. The plastic mesh in the vent protective layer is equipped with multiple retaining rings and vent holes to ensure the mesh is fixed during installation and the vent holes are breathable.

[0011] The beneficial effects of the present invention are as follows: 1. The unpowered hood can utilize the natural wind speed in nature to drive the turbine rotation of the fan and the principle of air convection inside and outside the soil (air vent), accelerate and transform the air flow in any parallel direction into a vertical air flow from bottom to top, and transmit the air to the air vent to ensure the breathing of the root system. That is, it solves the problem that the roots cannot breathe well and grow due to the compaction of urban soil, and promotes air circulation on the basis of traditional air vents, and solves the problem that the traditional air vents have limited ventilation effect and small coverage. 2. The device can facilitate the development of water and fertilizer management, solve the problems of tree lack of water, poor watering, water infiltration in tree pools, and difficulty for water to reach the roots. The device can increase the amount of irrigation, increase the water storage time, and enable water to quickly penetrate around the capillaries. At the same time, both ventilation and water permeability are more uniform. 3. The device can achieve connectivity between tree pools, increase the space for root expansion, avoid the occurrence of the flower pot effect, and reduce the workload of water and fertilizer management. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is an overall schematic diagram of the utility model;

[0013] Figure 2 This is a detailed diagram of the connection between the vertical pipe and the horizontal pipe of the present utility model;

[0014] Figure 3 This is a schematic diagram of the unpowered hood structure of the utility model;

[0015] Figure 4 This is a schematic diagram of the butterfly valve structure of the utility model;

[0016] Figure 5 This is a schematic diagram of the structure of the air-permeable protective layer of the utility model;

[0017] Figure 6 This is a schematic diagram of the sealing ring and reinforcement ring structure at the connection between the vertical pipe and the horizontal pipe of the utility model.

[0018] The accompanying drawings are numbered as follows:

[0019] 1. Vertical pipe; 2. Horizontal pipe; 3. Non-powered hood; 4. Butterfly valve; 5. Air vent protective layer; 6. Air vent; 7. 3-way pipe connector; 8. Hood housing; 9. Turbine; 10. Bearing; 11. Butterfly valve housing; 12. Butterfly plate; 13. Knob; 14. Plastic mesh; 15. Sealing ring; 16. Reinforcement ring; 17. Connecting flange; 18. Sealing gasket; 19. Retaining ring; 20. Positioning pin; 21. Rain cap; 22. Indicator mark; 23. Blade; 24. Air vent protective layer air vent. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a self-ventilating tree ventilation device, comprising a vertical pipe 1, a horizontal pipe 2, a non-powered hood 3, a butterfly valve 4, and a protective air vent layer 5. The vertical pipe 1 is made of PVC and cylindrical. Its length ranges from 1 to 1.5 meters, with an inner diameter of 10 to 15 cm. A 20 cm portion of the top end of the vertical pipe 1 is reserved without air vents 6. The horizontal pipe 2 is also made of PVC and cylindrical. Its length is determined by the crown projection. For single-tree installations, the length of the horizontal pipe 2 is approximately equal to the crown diameter. For interconnected tree pits, the length of the interconnected tree pits must be added. The inner diameter is 15 to 20 cm. For single-tree installations, the inner diameter of the horizontal pipe 2 is 15 cm. As more trees are interconnected, the inner diameter of the horizontal pipe 2 increases, reaching a maximum of 20 cm. A 20 cm portion of each end of the horizontal pipe 2 is reserved without air vents 6. The vertical pipe 1 and the horizontal pipe 2 are connected by a three-way pipe connector 7, which can be connected by threads, screws, or splices. The unpowered hood 3 is mounted on the top of the vertical pipe 1 and connected to the vertical pipe 1 through a butterfly valve 4, which is opened and closed by a knob 13. The vent protection layer 5 is a plastic mesh 14 wrapped around the outer wall of the vertical pipe 1 and the horizontal pipe 2 to ensure that the vent 6 is not blocked.

[0022] See also Figure 2 The connection between the vertical tube 1 and the horizontal tube 2 is provided with a sealing ring 15 and a reinforcement ring 16. The sealing ring 15 ensures the sealing of the connection. The reinforcement ring 16 is fixed to the connection between the vertical tube 1 and the horizontal tube 2 by welding or bonding to enhance the strength of the connection. Multiple ventilation holes 6 are provided on the walls of the vertical tube 1 and the horizontal tube 2. The diameter of the ventilation holes 6 is 1-2 cm, and each ventilation hole 6 is spaced 5-10 cm apart. The ventilation holes 6 are distributed in six directions to ensure uniform distribution and ventilation effect.

[0023] See also Figure 3The unpowered hood 3 includes a hood shell 8, a turbine 9 and a bearing 10. The hood shell 8 is conical in shape. The turbine 9 is installed inside the hood shell 8 and is rotatably connected to the hood shell 8 through the bearing 10. A plurality of blades 23 are provided on the turbine 9. The blades 23 are distributed in a spiral shape. The number of blades 23 is 4-8. The thickness of the blades 23 is 0.5-1mm. The spacing between the blades 23 is 1-2cm, ensuring that the turbine 9 can rotate smoothly under the action of natural wind. A connecting flange 17 is provided at the bottom of the hood shell 8, which is connected to the butterfly valve 4 by threading or rotating. A rainproof cap 21 is provided on the top of the hood shell 8. The rainproof cap 21 is conical in shape to ensure the rainproof effect of the top of the hood shell 8.

[0024] See also Figure 4 The butterfly valve 4 includes a butterfly valve housing 11, a butterfly plate 12, and a knob 13. The butterfly valve housing 11 is fixedly connected to the top of the standpipe 1. The butterfly plate 12 is controlled to open and close by the knob 13. A sealing gasket 18 is provided on the butterfly plate 12 to ensure a tight seal when the butterfly plate 12 is closed. An indicator mark 22 is fixed to the butterfly plate 12 by engraving or spraying to ensure that the open and closed status of the butterfly plate 12 can be visually displayed. The knob 13 is provided with anti-slip grooves to ensure anti-slip performance during manual operation.

[0025] See also Figure 5 The vent protection layer 5 is a plastic mesh 14 with a thickness of 0.5-1 mm and a mesh diameter of 0.1-0.5 mm, ensuring that the vents 6 are not blocked by soil particles. The plastic mesh 14 is provided with a plurality of fixing rings 19, which are fixed to the plastic mesh 14 by bonding or sewing to ensure the stability of the plastic mesh 14 during installation. The plastic mesh 14 is provided with a plurality of vent holes 24 with a diameter of 1-2 mm, ensuring the air permeability of the vents 6.

[0026] See also Figure 6 A positioning pin 20 is provided at the connection between the vertical pipe 1 and the horizontal pipe 2. The positioning pin 20 is fixed to the connection between the vertical pipe 1 and the horizontal pipe 2 by plugging to ensure the positioning accuracy of the connection.

[0027] Here's how it works:

[0028] 1. Installation process:

[0029] The vertical pipe 1 and the horizontal pipe 2 are connected through a three-way pipe connector 7, and a sealing ring 15 and a reinforcement ring 16 are installed at the connection to ensure the sealing and strength of the connection.

[0030] Ventilation holes 6 are drilled on the walls of the vertical pipe 1 and the horizontal pipe 2. The diameter of the ventilating holes 6 is 1-2 cm. Each ventilating hole 6 is spaced 5-10 cm apart and is distributed in 6 directions.

[0031] The plastic gauze 14 is wrapped around the outer wall of the vertical tube 1 and the horizontal tube 2 and fixed with a fixing ring 19 to ensure that the air vent 6 is not blocked by soil particles.

[0032] The butterfly valve 4 is installed at the top of the vertical pipe 1, and the opening and closing of the butterfly plate 12 is controlled by the knob 13.

[0033] The unpowered hood 3 is installed on the butterfly valve 4 and connected to the butterfly valve 4 through the connecting flange 17.

[0034] 2. Operation process:

[0035] The turbine 9 of the unpowered hood 3 rotates under the action of natural wind, and is rotatably connected to the hood shell 8 through the bearing 10, driving the internal gas to be discharged and replaced with external air.

[0036] The function of the non-powered wind hood 3 ensures the gas flow in the tree's air duct and the exchange with the outside, provides the oxygen required by the roots, and promotes the respiration and growth of the roots.

[0037] When the temperature drops in winter, the butterfly valve 4 is closed by the knob 13. The sealing gasket 18 on the butterfly plate 12 ensures the sealing of the butterfly plate 12 when it is closed, preventing the root moisture from being drained.

[0038] The plastic gauze 14 of the air vent protection layer 5 ensures that the air vents 6 are not blocked by soil particles, and the fixing ring 19 on the plastic gauze 14 ensures the fixation of the plastic gauze 14 during installation.

[0039] Through the above structure and operating principle, this self-ventilating tree ventilation device can effectively solve the problem of urban soil compaction, which leads to poor root breathing and growth. It also promotes air circulation compared to traditional ventilation tubes, solving the problems of limited ventilation and coverage of traditional ventilation tubes. Furthermore, the device facilitates water and fertilizer management, solving problems such as tree water shortages, poor watering, and water-impermeable tree pits. It also increases root space and reduces the workload of water and fertilizer management.

[0040] The following are the test results based on this embodiment:

[0041] This experiment focused on coniferous Pinus tabulaeformis trees in a specific park. Due to the site's compacted soil and the difficulty retaining water on the slopes, resulting in prolonged drought, poor soil aeration and permeability, and low nutrient content, these pines have experienced a long-term decline. This decline is manifested by yellowing needles, minimal new shoot growth (averaging less than 30 cm), and a low number of remaining needles. The selected pines all had a diameter at breast height (DBH) of 13-19 cm and were approximately 10 years old. Eighteen weakened Pinus tabulaeformis trees were selected for rejuvenation and investigation in a first section of the park.

[0042] Eighteen weak Pinus tabulaeformis trees in the park were selected and two treatment groups and one control group were set up, with 6 trees in each treatment group.

[0043] In treatment 1, the pine trees were backfilled with original soil after the device of the present invention was installed. In March, 30 ml of a 3000-fold diluted solution of a water-soluble fertilizer was continuously used for root irrigation three times. In May, 100 L of clean water was used for irrigation. In November, the roots were irrigated once. In treatment 2, the pine trees were irrigated at the same time, but only clean water was used without adding water-soluble fertilizer. The blank control was only irrigated with clean water at the same time, but the device of the present invention was not buried.

[0044] The experiment started on March 1, 2019. From March 1 to November 30 each year in 2019 and 2020, the growth of new shoots and the density were measured once a month, recorded and analyzed by variance with a significance level of 0.05. The results are shown in the table below.

[0045] Table 1 Comparison of rejuvenation effects of Pinus tabulaeformis

[0046]

[0047] As shown in Table 1, the rejuvenation effects of Group 1 device + water-soluble fertilizer and Group 2 device + watering were not significant, but the new shoot growth was significantly greater than that of the control group, indicating that the application of the device of the present invention can significantly increase the new shoot growth of Pinus tabulaeformis. At the same time, although no significant differences were found between the experimental groups, the new shoot growth of the group treated with the device + water-soluble fertilizer in 2020 was still greater than that of the group treated with the device + water. In 2019, the average new shoot growth of Pinus tabulaeformis in the experimental group was about 4 cm longer than that of the control group, and in 2020, it was about 6-9 cm longer than that of the control group. After rejuvenation, the crown density of Pinus tabulaeformis was also improved, and the tree vigor of Pinus tabulaeformis has been greatly improved.

[0048] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of the components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term and should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0049] It should be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0050] The above description shows and describes several preferred embodiments of the present invention. However, as previously mentioned, it should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the present invention as taught herein or through the techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A self-ventilating tree ventilation device, comprising a vertical pipe (1), a horizontal pipe (2), a non-powered wind cap (3), a butterfly valve (4) and a ventilation hole protective layer (5), characterized in that: The vertical pipe (1) is made of PVC and is cylindrical. The length of the vertical pipe (1) is in the range of 1-1.5m, and the inner diameter is 10-15cm. The uppermost end of the vertical pipe (1) is reserved for 20cm without an air hole (6). The transverse pipe (2) is also made of PVC and is cylindrical. The length of the transverse pipe (2) is determined by the crown projection. When a single tree is set, the length of the transverse pipe (2) is approximately equal to the crown diameter. When a connecting tree pool is set, the length of the connection between the tree pools must be added. The inner diameter is 15-20 cm. When a single tree is set, the inner diameter of the transverse pipe (2) is 15 cm. The more trees there are in the connecting tree pools, the larger the inner diameter of the transverse pipe (2), with a maximum of 20 cm. 20 cm is reserved at both ends of the transverse pipe (2) without air holes (6); The vertical pipe (1) and the horizontal pipe (2) are connected via a 3-way pipe connector (7), and the connection method is threaded connection, screw connection or splicing connection; The unpowered hood (3) is installed at the top of the vertical pipe (1) and is connected to the vertical pipe (1) via a butterfly valve (4), and the butterfly valve (4) is controlled to open and close by a knob (13); The vent protection layer (5) is a plastic gauze (14) wrapped around the outer walls of the vertical tube (1) and the horizontal tube (2) to ensure that the vent (6) is not blocked.

2. The self-ventilating tree ventilation device according to claim 1, characterized in that: A plurality of air holes (6) are provided on the walls of the vertical tube (1) and the horizontal tube (2). The diameter of the air holes (6) is 1-2 cm, and each air hole (6) is spaced 5-10 cm apart. The air holes (6) are distributed in six directions.

3. The self-ventilating tree ventilation device according to claim 1, characterized in that: The unpowered hood (3) comprises a hood shell (8), a turbine (9) and a bearing (10); the hood shell (8) is conical; the turbine (9) is installed inside the hood shell (8) and is rotatably connected to the hood shell (8) via the bearing (10).

4. The self-ventilating tree ventilation device according to claim 1, characterized in that: The butterfly valve (4) comprises a butterfly valve housing (11), a butterfly plate (12) and a knob (13); the butterfly valve housing (11) is fixedly connected to the top end of the vertical pipe (1); and the butterfly plate (12) is controlled to open and close by the knob (13).

5. The self-ventilating tree ventilation device according to claim 1, characterized in that: A sealing ring (15) is provided at the connection between the vertical pipe (1) and the horizontal pipe (2) to ensure the sealing of the connection.

6. The self-ventilating tree ventilation device according to claim 1, characterized in that: The bottom of the hood shell (8) of the unpowered hood (3) is provided with a connecting flange (17), which is connected to the butterfly valve (4) by means of threads or rotation.

7. The self-ventilating tree ventilation device according to claim 1, characterized in that: A sealing gasket (18) is provided on the butterfly plate (12) of the butterfly valve (4) to ensure the sealing performance of the butterfly plate (12) when it is closed.

8. The self-ventilating tree ventilation device according to claim 1, characterized in that: The plastic mesh (14) of the air vent protection layer (5) has a thickness of 0.5-1 mm and a mesh diameter of 0.1-0.5 mm, ensuring that the air vents (6) are not blocked by soil particles.

9. The self-ventilating tree ventilation device according to claim 1, characterized in that: A reinforcement ring (16) is provided at the connection between the vertical pipe (1) and the horizontal pipe (2); the reinforcement ring (16) is fixed to the connection between the vertical pipe (1) and the horizontal pipe (2) by welding or bonding, thereby enhancing the strength of the connection.

10. The self-ventilating tree ventilation device according to claim 1, characterized in that: The turbine (9) of the unpowered hood (3) is provided with a plurality of blades (23), the blades (23) are distributed in a spiral shape, the number of blades (23) is 4-8, the thickness of the blades (23) is 0.5-1 mm, and the spacing between the blades (23) is 1-2 cm, so as to ensure that the turbine (9) can rotate smoothly under the action of natural wind.

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