Water permeable modular curtain

Abstract

This invention relates to the field of evaporative cooling and ventilation equipment technology, specifically to a permeable module-based wet curtain system. It comprises an integrated wet curtain wall formed by splicing multiple types of permeable modules together with mortise and tenon joints and integrally constructing them into a building wall. The wet curtain wall has opposing inner and outer surfaces. Each permeable module includes an upper module, a middle module, and a lower module, which are stacked vertically and interlocked using mortise and tenon joints. This technical solution uses specially designed permeable module bricks to construct the wet curtain. The permeable module bricks are directly stacked into the wall in a mortise and tenon sequence, and can be used immediately after installing a water circulation system. This maximizes the installation area of ​​the wet curtain. The permeable module bricks are sturdy and durable, can be high-pressure washed and chemically cleaned, and have a service life comparable to that of the building. The overall construction cost and operation and maintenance costs are far lower than existing wet curtain systems.

Description

Technical Field

[0001] This invention relates to the field of evaporative cooling and ventilation equipment technology, specifically to a water-permeable module-based wet curtain system. Background Technology

[0002] Evaporative cooling pads are widely used in livestock sheds, greenhouses, and industrial plants. They offer advantages such as low initial investment, low operating energy consumption, energy saving, and environmental friendliness, while simultaneously providing ventilation. They are a core facility for environmental cooling and control in summer, and are most commonly used in livestock farming. Currently, most mainstream evaporative cooling pad equipment uses paper honeycomb panels as the core heat exchange substrate. However, these paper-based evaporative cooling pads have many inherent defects under long-term circulating water supply conditions, severely limiting equipment performance and lifespan. The pores of the paper substrate easily accumulate calcium and magnesium ions from the water, as well as impurities such as feed dust and outdoor sediment. After a short period of operation, calcification and scaling, and pore blockage occur, preventing water from evenly penetrating the entire evaporative cooling pad, creating localized dry areas, significantly reducing heat exchange efficiency, and noticeably diminishing the cooling effect.

[0003] Meanwhile, paper-based printing plates, constantly exposed to a damp environment, are highly susceptible to the growth of moss, microbial slime, and other contaminants. This not only further clogs ventilation and heat exchange pores but also continuously generates odors, polluting indoor air and severely impacting livestock farming and factory production environments. Furthermore, paper-based materials have extremely poor water resistance and erosion resistance, making deep cleaning and maintenance impossible using high-pressure water guns or chemical descaling methods. Once clogged or aged, the entire equipment must be replaced. Conventional paper-based evaporative cooling pads have a lifespan of only about three years; frequent replacements continuously increase the operating costs of livestock farming and industrial production, resulting in poor economic efficiency and practicality. Summary of the Invention

[0004] To address the aforementioned defects and problems, this invention provides a permeable module-built evaporative cooling pad. This technical solution uses specially designed permeable module bricks to build the evaporative cooling pad. The permeable module bricks are directly stacked into the wall in a mortise and tenon sequence, and can be used with a water circulation system. This can maximize the installation area of ​​the evaporative cooling pad. The permeable module bricks are sturdy and durable, can be high-pressure washed and chemically cleaned, and have a service life as long as the building. The overall cost and operation and maintenance costs are far lower than existing evaporative cooling pads.

[0005] The solution adopted by this invention to solve its technical problem is: a permeable module-built wet curtain, comprising an integrated wet curtain wall formed by splicing multiple types of permeable modules with mortise and tenon joints and integrally building the wall. The wet curtain wall has an inner side and an outer side arranged opposite to each other. The permeable module includes an upper module, a middle module, and a lower module. The upper module, middle module, and lower module are stacked vertically and connected to each other by mortise and tenon joints. The upper module has a top water passage extending horizontally inside. The bottom surface of the upper module has multiple vertical water passages communicating with the top water passage. The middle module and the lower module have multiple ventilation holes penetrating the inner and outer sides, respectively. The wet curtain wall also includes a water inlet pipe above the upper module and a water return pipe below the lower module. The water inlet pipe communicates with the top water passage, and the water return pipe communicates with the drainage channel at the bottom of the lower module.

[0006] Furthermore, the upper module includes an upper left block, an upper middle block, and an upper right block arranged in a horizontal direction and connected to each other by a mortise and tenon structure. Each of the upper left block, upper middle block, and upper right block has a rectangular blind pipe extending in a horizontal direction. The rectangular blind pipes are connected to form a top water passage. The upper left block and / or upper right block has a water inlet hole that communicates with the top water passage.

[0007] Furthermore, the middle layer module includes a left middle block, a middle middle block, and a right middle block arranged in a horizontal direction and connected to each other by a tenon and mortise structure. The ventilation holes are provided on the left middle block, the middle middle block, and the right middle block. The ventilation holes are conical holes with a diameter that gradually decreases from the outer side to the inner side. Outdoor air flows in through the large end of the conical hole and flows out through the small end.

[0008] Furthermore, the lower module includes a lower left block, a lower middle block, and a lower right block arranged in a horizontal direction and connected to each other by a mortise and tenon structure. The lower half of the lower left block, the lower middle block, and the lower right block are respectively provided with rectangular blind pipes extending in a horizontal direction. The rectangular blind pipes are connected to form a drainage channel. The lower left block and / or the lower right block are provided with drainage holes that communicate with the drainage channel.

[0009] Furthermore, a filter screen is laid at the bottom of the top water passage of the upper module, and the vertical water permeable holes are located below the filter screen. A cleaning hole is opened on the inner wall of the upper module. The cleaning hole is connected to the top water passage and is located inside the filter screen. A removable sealing plug is provided in the cleaning hole.

[0010] Furthermore, the water inlet pipe is equipped with a water level controller, which extends into the top water passage and is used to control the water inlet flow according to the water level in the top water passage. The water inlet pipe is also equipped with a solenoid valve.

[0011] Furthermore, the mortise and tenon structure between the upper module, the middle module, and the lower module includes an inverted trapezoidal protrusion at the bottom of the upper module and a trapezoidal groove at the top of the lower module, wherein the inverted trapezoidal protrusion matches the shape of the trapezoidal groove and is fitted together.

[0012] Furthermore, the mortise and tenon structure between the blocks of the upper / middle / lower module includes a left-end mortise and tenon interface and / or a right-end mortise and tenon interface located at the lateral end of a single block, and adjacent blocks are laterally joined by matching left-end mortise and tenon interfaces and right-end mortise and tenon interfaces.

[0013] The beneficial effects of this invention are: The permeable module of this invention is integrally formed using non-fired permeable bricks or sintered permeable bricks. The material is hard and corrosion-resistant, and can be directly cleaned with a high-pressure water gun or soaked in chemical descaling agents to remove scale and moss. It does not have the defects of paper wet curtains that are easy to rot and cannot be cleaned. Its service life can be synchronized with the building wall, eliminating the need for frequent component replacement and reducing long-term operating expenses such as consumable replacement and manual disassembly. The module is equipped with independent cleaning holes and removable rubber seals. When the internal filter and water passage are clogged, there is no need to disassemble the entire wet curtain wall. The internal unclog can be completed simply by cleaning the holes, making daily inspection and maintenance simple.

[0014] The permeable module of this invention adopts a composite structure of vertical permeable holes for water distribution and outer large and inner small conical vent holes. The circulating water forms a complete water film on the inner wall of the vent holes. Outdoor airflow flows in through the large opening and out through the small opening of the conical holes. On the one hand, it relies on the evaporation of the water film to absorb the heat of the air and achieve evaporative cooling. On the other hand, the airflow generates a Joule-Thomson throttling effect in the narrow-diameter channel, and the air temperature itself decreases synchronously. With the superposition of the dual cooling mechanisms, under the same water supply and ventilation conditions, the indoor temperature reduction is better than that of a single evaporative paper wet curtain.

[0015] The permeable module consists of three layers: upper, middle, and lower. Each layer is equipped with nine types of standard blocks, including left sealing blocks, middle splicing blocks, and right sealing blocks. The number of middle splicing blocks can be freely increased or decreased according to the actual width of the wall, flexibly adapting to building walls of different thicknesses, such as 24mm and 37mm walls, and window openings of different widths. The standardized blocks facilitate mass prefabrication and have strong versatility. The permeable module of this invention is spliced ​​in layers through mortise and tenon joints and trapezoidal concave and convex structures, and can be directly and synchronously built with the building wall without the need for a separate metal frame or load-bearing lintel, simplifying the construction process and shortening the overall construction period.

[0016] The thickness of the permeable module blocks is consistent with the thickness of the standard building wall. In summer, the evaporative cooling can be achieved normally by removing the outer film of the vent. In winter, when the system is shut down, the outer port of the conical vent is sealed with a sealing film, and a complete insulation wall can be formed by relying on the block itself. There is no need to install additional insulation boards or insulation barriers, saving the extra costs of purchasing, installing and storing insulation equipment in winter. One set of structures can be used all year round, and the overall utilization rate of the equipment is higher. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the split structure of the permeable module of the present invention; Figure 2 This is a schematic diagram of the upper left block structure of the present invention; Figure 3 This is a schematic diagram of the upper and middle block structure of the present invention; Figure 4 This is a schematic diagram of the upper right block structure of the present invention; Figure 5 This is a schematic diagram of the left-middle block structure of the present invention; Figure 6 This is a schematic diagram of the intermediate block structure of the present invention; Figure 7 This is a schematic diagram of the right-middle block structure of the present invention; Figure 8 This is a schematic diagram of the lower left block structure of the present invention; Figure 9 This is a schematic diagram of the lower middle block structure of the present invention; Figure 10 This is a schematic diagram of the lower right block structure of the present invention; Figure 11 This is a schematic diagram of the permeable module stacked wet curtain structure of the present invention; Figure 12 This is a schematic diagram of the water inlet pipe structure of the present invention.

[0018] In the diagram: 1. Top left block; 2. Top middle block; 3. Top right block; 4. Middle left block; 5. Middle block; 6. Middle right block; 7. Bottom left block; 8. Bottom middle block; 9. Bottom right block; 10. Rectangular blind pipe; 11. Inverted trapezoidal protrusion; 12. Trapezoidal groove; 13. Water permeable hole; 14. Left end tenon joint; 15. Cleaning hole; 16. Right end tenon joint; 17. Water inlet hole; 18. Vent hole; 19. Drain hole; 20. Water inlet pipe; 21. Water level controller; 22. Return water pipe. Detailed Implementation

[0019] The following is in conjunction with the appendix of this invention. Figure 1-12 The paper elaborates on the complete structure, assembly method, workflow, and operation and maintenance of permeable module-based wet curtains. Example

[0020] This invention comprises three main parts: a permeable module combined wall, a water circulation pipeline, and a negative pressure ventilation supporting structure. The permeable modules are integrally formed using non-fired permeable bricks or sintered permeable bricks. Common thicknesses for a single permeable module are 24cm and 37cm; 24cm is used as an example here. The module structure has high strength and can withstand high-pressure water erosion and chemical cleaning, achieving a service life equivalent to the main building wall. This differs from existing paper honeycomb wet curtains, which age and calcify after about 3 years, grow moss, and cannot be deeply cleaned. Figure 1 As shown, all permeable modules are divided into nine standard blocks, vertically divided into three levels: upper, middle and lower. Each level is composed of corresponding sealing blocks and middle splicing blocks joined together by mortise and tenon joints. The upper module includes upper left block 1, upper middle block 2, and upper right block 3; the middle module includes middle left block 4, middle block 5, and middle right block 6; and the lower module includes lower left block 7, lower middle block 8, and lower right block 9.

[0021] The same type of blocks inside each layer are joined together by horizontal mortise and tenon joints to achieve horizontal sealing. The left and right ends of the blocks are integrally formed with the left mortise and tenon joint 14 and the right mortise and tenon joint 16, respectively. The left mortise and tenon joint 14 of a single block can be completely fitted and matched with the right mortise and tenon joint 16 of the adjacent block. After the horizontal splicing is completed, the gaps between the mortise and tenon joints are filled with tile adhesive for sealing and waterproofing to avoid water seepage and leakage during water circulation. The vertical sealing and overlapping between adjacent modules relies on a trapezoidal interlocking structure. Each module has an integrally formed inverted trapezoidal protrusion 11 at the bottom, and a trapezoidal groove 12 is opened at the top of the corresponding module in the lower layer. The inverted trapezoidal protrusion 11 of the upper module is completely embedded in the trapezoidal groove 12 of the lower module. The gap between the protrusion and groove is also filled with tile adhesive for sealing. The horizontal tenon and mortise and vertical trapezoidal interlocking structures work together to form an integrally sealed wet curtain wall after all the blocks are spliced. The wet curtain wall is directly built and embedded into the building wall. The gap between the wall and the permeable module is filled with waterproof adhesive for sealing. There is no need to add a separate metal frame or load-bearing beam structure. Under the same building space, the effective ventilation and heat exchange area of ​​the wet curtain can be increased by more than one-third compared with the traditional external wet curtain, which greatly improves the overall cooling efficiency.

[0022] like Figure 2-4As shown, rectangular blind pipes 10 are pre-reserved inside each upper module. After the upper left block 1, upper middle block 2 and upper right block 3 are assembled by transverse mortise and tenon joint, the rectangular blind pipes 10 inside the three are communicated with each other, jointly forming a transversely penetrating top water passage, which serves as the water distribution structure of the entire wet curtain. Multiple sets of vertical water-permeable holes 13 are uniformly formed on the bottom wall of the rectangular blind pipe 10, and the vertical water-permeable holes 13 are arranged in order along the length direction of the passage. A stainless steel filter screen is laid flat at the bottom of the rectangular blind pipe 10 and above the vertical water-permeable holes 13. The filter screen can filter sediment and suspended impurities in the circulating water, preventing the impurities from blocking the vertical water-permeable holes 13. A cleaning hole 15 is formed on the inner side wall of the upper module close to the indoor side, the cleaning hole 15 is arranged in the inner area of the filter screen, the specification of the cleaning hole 15 is 100mm×20mm, and a detachable rubber sealing plug is matched in the hole; when a large amount of impurities are deposited on the surface of the filter screen and the interior of the rectangular blind pipe 10 is blocked, the staff can remove the rubber sealing plug, extend a brush or other tools through the cleaning hole 15 to complete the cleaning of the interior of the passage, without disassembling the entire wet curtain wall, which facilitates convenient operation and maintenance.

[0023] A water inlet hole 17 is formed on the top surface of the upper right block 3 or the upper left block 1, the water inlet hole 17 is directly communicated with the top water passage, and the water inlet hole 17 is used for connecting the water inlet pipe 20 of the whole water circulation system; the water inlet pipe 20 is a hard pipeline, and a water level controller 21 is vertically installed at the end of the pipeline. The water level controller 21 extends into the water inlet hole 17 and is placed in the top water passage. The water level controller 21 adopts a non-powered float-type structure, which automatically controls the on-off of water inlet depending on the water level inside the passage. When the water level in the top water passage exceeds the preset height, the water level controller 21 automatically cuts off the water inlet passage, and automatically restores the water supply after the water level drops to the standard range, so as to continuously maintain a stable water level in the passage and ensure uniform water distribution. A solenoid valve is synchronously assembled on the water inlet pipe 20, and the solenoid valve is electrically linked with the negative-pressure fan supporting the livestock house and the workshop. When the negative-pressure fan starts to work, the solenoid valve is synchronously opened for water supply, and when the fan stops, the solenoid valve synchronously cuts off the water inlet, realizing synchronous start-stop control of ventilation and water supply.

[0024] As Figure 5-10As shown, the main walls of both the middle and lower modules are arranged in a matrix with multiple sets of ventilation holes 18. Each ventilation hole 18 is a conical through-hole that penetrates both the outer and inner surfaces of the blocks. The diameter of the ventilation hole 18 is larger on the outer side and gradually narrows on the inner side, forming an overall trumpet-shaped structure that is wider on the outside and narrower on the inside. Circulating water drips downwards from the vertical permeable holes 13 in the upper layer, flowing through the walls of the middle and lower modules and forming a continuous and uniform water film on the inner wall of the ventilation holes 18. Under the negative pressure created by the negative pressure fan, hot outdoor air flows in from the outer side of the larger diameter ventilation hole 18 and flows out from the inner side of the smaller diameter. As the airflow passes through the water film, on the one hand, the water film evaporates and absorbs heat from the air, achieving evaporative cooling; on the other hand, the airflow generates a Joule-Thomson throttling effect when passing through the conical through-hole narrowing channel, further reducing the air temperature. This dual cooling mechanism enhances the overall cooling effect. Simultaneously, the matrix arrangement of the conical ventilation holes 18 significantly increases the contact area between the air and the water film, resulting in a heat exchange efficiency superior to the traditional single-hole wet curtain structure.

[0025] like Figures 8-10 As shown, the lower half of the lower module features an integrally formed rectangular blind pipe 10. After the lower left block 7, lower middle block 8, and lower right block 9 are horizontally spliced ​​together, the internal rectangular blind pipes 10 are interconnected to form a bottom drainage channel, used to collect all the circulating water dripping from the vertical permeable holes 13 above. The bottom of all the lower blocks is a complete solid closed base to prevent bottom leakage. The lowest position of the rectangular blind pipe 10 of the lower left block 7 or lower right block 9 has a drain hole 19, which is connected to the return water pipe 22 of the water circulation system. The diameter of the return water pipe 22 is consistent with that of the inlet pipe 20. The collected circulating water flows back to the external circulating water tank through the drain hole 19 and the return water pipe 22, forming a complete closed-loop water circulation.

[0026] The entire permeable module system for building wet curtains can be freely extended in horizontal splicing length according to actual cooling needs. The basic unit wall consists of one upper left block 1, one upper right block 3, one lower left block 7, and one lower right block 9 as the left and right boundaries. In the middle, corresponding numbers of upper middle blocks 2, middle blocks 5, and lower middle blocks 8 are added according to the wall width. The outer walls of all boundary blocks are completely sealed solid walls to prevent water leakage from the sides of the wall. The permeable module material is water-resistant and corrosion-resistant. Scale and moss adhering to the surface of the wall after long-term use can be directly rinsed with a high-pressure water gun, or soaked in a special chemical descaling agent. After cleaning, there is no loss to the structure or permeability, significantly reducing maintenance costs.

[0027] This invention is adaptable to all seasons. In summer, it can achieve water circulation ventilation and cooling. In winter, when cooling is not required in breeding and production sites, all outdoor ports of the conical ventilation holes 18 can be sealed with a sealing film. Since the thickness of the permeable module blocks is consistent with the thickness of the standard 24mm and 37mm walls of the building, the blocks themselves can serve as insulation walls after sealing with the film, eliminating the need for additional insulation boards and insulation barriers, thus significantly reducing the investment in winter insulation.

[0028] Example 2 (Standard 24-wall base unit wet curtain): This embodiment uses 240mm thick permeable modules to construct a single basic unit wet curtain wall. Only one set of boundary blocks is installed horizontally, without adding intermediate splicing blocks. During assembly, the upper left block 1 and upper right block 3 are horizontally joined together, their mortise and tenon joints matching and sealed to form a complete upper-layer water distribution channel. The middle left block 4 and middle right block 6 are horizontally joined with mortise and tenon joints to form a middle-layer ventilation structure. The lower left block 7 and lower right block 9 are spliced ​​together to form a lower-layer water collection and drainage channel. The inverted trapezoidal protrusion 11 at the bottom of the upper module is embedded into the trapezoidal groove 12 at the top of the middle module, and the inverted trapezoidal protrusion 11 at the bottom of the middle module is embedded into the trapezoidal groove 12 at the top of the lower module. All gaps between layers and horizontal mortise and tenon joints are filled with tile adhesive for sealing. The entire assembly is embedded into the pre-reserved window in the 24-inch wall of the building, and the gap between the wall and the blocks is filled with waterproof adhesive.

[0029] During the pipeline assembly stage, the water level controller 21 at the end of the inlet pipe 20 is inserted into the inlet hole 17 of the upper right block 3, and the return pipe 22 is connected to the drain hole 19 of the lower left block 7. The solenoid valve circuit is linked to the wiring terminal of the negative pressure fan in the livestock house. When the equipment is running, the fan starts and the solenoid valve is opened simultaneously. Cold water enters the top water passage, is filtered by the stainless steel filter screen, and is evenly sprayed downwards through the vertical water permeable holes 13, forming a complete water film on the inner wall of the ventilation holes 18 in the middle and lower layers. Outdoor hot air flows into the room through the trumpet-shaped ventilation holes 18, and heat exchange is completed by evaporation and throttling. The water that is sprayed down is collected in the lower drainage channel and flows back to the circulating water tank through the drain hole 19 and the return pipe 22. If the filter becomes clogged during the operation and maintenance phase, remove the rubber plugs from the cleaning holes 15 of the upper left block 1, upper middle block 2, and upper right block 3, and use a brush to clean the mud and sand on the surface of the filter. For water scale on the wall surface, simply use a high-pressure rinse. In winter, cover all the outer ventilation holes 18 with a plastic film to achieve indoor insulation by relying on the block wall.

[0030] Example 3 (Wideened Multi-Block Evaporative Cooling Wall): This embodiment is applicable to large-area livestock and poultry houses and industrial plants. Based on the first embodiment, multiple sets of intermediate splicing blocks are added to expand the heat exchange area. The upper layer consists of multiple upper middle blocks 2 spliced ​​between the upper left block 1 and the upper right block 3; the middle layer consists of multiple middle blocks 5 spliced ​​between the middle left block 4 and the middle right block 6; and the lower layer consists of multiple lower middle blocks 8 spliced ​​between the lower left block 7 and the lower right block 9. Adjacent middle blocks are spliced ​​sequentially using mortise and tenon joints at both ends to extend the horizontal length of the wall. The vertical sealing between layers still uses a trapezoidal concave-convex structure. The overall width of the evaporative cooling pad wall increases synchronously with the number of middle blocks, and the total number of ventilation holes 18 also increases synchronously. The air heat exchange contact area is more than doubled compared to the basic unit, adapting to the rapid cooling needs of large spaces. The diameter of the inlet pipe 20 increases synchronously with the widening of the wall to match a larger water inflow. The water level controller 21 continuously and stably controls the water level in the water distribution channel to ensure uniform water spraying throughout the extended wall and prevent uneven distribution of dry and wet areas. The rest of the assembly method, water circulation principle, and operation and maintenance methods are completely consistent with those in Example 1.

[0031] The above embodiments are merely three typical implementations of the present invention and are not intended to limit the structure, size, or assembly form of the present invention. Those skilled in the art can make equivalent substitutions or simple modifications to the thickness of the permeable module, the number of splicing blocks, the pipe specifications, and the linkage control method without departing from the core structural concept of the present invention, all of which fall within the protection scope defined by the claims of the present invention.

Claims

1. A permeable module-built evaporative cooling pad, comprising an integrated evaporative cooling pad wall formed by splicing multiple types of permeable modules together with mortise and tenon joints and integrally constructing them into a building wall, characterized in that, The wet curtain wall has an inner side and an outer side that are arranged opposite to each other. The permeable module includes an upper module, a middle module and a lower module. The upper module, the middle module and the lower module are stacked vertically and connected to each other by mortise and tenon structure. The upper module has a top water passage extending horizontally inside. The bottom surface of the upper module has multiple vertical water passages (13) that communicate with the top water passage. The middle module and the lower module have multiple ventilation holes (18) that penetrate the inner side and the outer side and vertical water passages (13) that correspond to the upper module. The wet curtain wall also includes a water inlet pipe (20) set above the upper module and a water return pipe (22) set below the lower module. The water inlet pipe (20) communicates with the top water passage, and the water return pipe (22) communicates with the drainage channel at the bottom of the lower module.

2. The permeable module-based wet curtain according to claim 1, characterized in that, The upper module includes an upper left block (1), an upper middle block (2) and an upper right block (3) arranged in a horizontal direction and connected to each other by a mortise and tenon structure. The upper left block (1), the upper middle block (2) and the upper right block (3) are respectively provided with rectangular blind pipes (10) extending in a horizontal direction. The rectangular blind pipes (10) are connected to form a top water passage. The upper left block (1) and / or the upper right block (3) are provided with water inlet holes (17) that communicate with the top water passage.

3. The permeable module stacked wet curtain according to claim 1, characterized in that, The middle layer module includes a left middle block (4), a middle middle block (5), and a right middle block (6) arranged horizontally and connected to each other by mortise and tenon joints. Ventilation holes (18) are provided on the left middle block (4), the middle middle block (5), and the right middle block (6). Each ventilation hole (18) is a conical hole with a gradually decreasing diameter from the outer side to the inner side, allowing outdoor air to flow in through the larger end and out through the smaller end. The left middle block (4), the middle middle block (5), and the right middle block (6) are provided with vertical permeable holes (13) corresponding to those in the upper layer module.

4. The permeable module stacked wet curtain according to claim 1, characterized in that, The lower module includes a lower left block (7), a lower middle block (8), and a lower right block (9) arranged horizontally and connected to each other by mortise and tenon joints. The lower half of each of the lower left block (7), lower middle block (8), and lower right block (9) is provided with a rectangular blind pipe (10) extending horizontally. The rectangular blind pipes (10) are connected to form a drainage channel. The lower left block (7) and / or lower right block (9) are provided with drainage holes (19) that communicate with the drainage channel. The upper half of the lower module has a vent hole (18) with the same structure as the corresponding middle module and a vertical water permeable hole (13) corresponding to the middle module.

5. The permeable module stacked wet curtain according to claim 2, characterized in that, A filter screen is laid at the bottom of the top water passage of the upper module. The vertical water permeable hole (13) is located below the filter screen. A cleaning hole (15) is opened on the inner wall of the upper module. The cleaning hole (15) is connected to the top water passage and is located inside the filter screen. A removable sealing plug is provided in the cleaning hole (15).

6. The permeable module stacked wet curtain according to claim 1, characterized in that, The water inlet pipe (20) is equipped with a water level controller (21), which extends into the top water passage and is used to control the water inlet flow according to the water level in the top water passage. The water inlet pipe (20) is also equipped with a solenoid valve.

7. The permeable module stacked wet curtain according to claim 1, characterized in that, The tenon structure between the upper module, the middle module and the lower module includes an inverted trapezoidal protrusion (11) at the bottom of the upper module and a trapezoidal groove (12) at the top of the lower module. The inverted trapezoidal protrusion (11) and the trapezoidal groove (12) are matched and fitted together.

8. The permeable module stacked wet curtain according to any one of claims 2-4, characterized in that, The mortise and tenon structure between the blocks of the same level includes a left mortise and tenon interface (14) and / or a right mortise and tenon interface (16) located at the lateral end of a single block. Adjacent blocks are laterally joined by matching left mortise and tenon interfaces (14) and right mortise and tenon interfaces (16).

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