One-way drain valve and composite geomembrane comprising same

Abstract

The utility model discloses a one -way drainage valve and by its constitute's composite ecological geomembrane belongs to one -way drainage valve field, including the water inlet pipe, the outer tube of connecting in the water inlet pipe outer periphery, set up the diaphragm on the water inlet pipe upper, cover the upper cover on the outer tube and the diaphragm, the diaphragm includes the switch cover that opens or closes to the water outlet of water inlet pipe and the wing ring structure that is integrated with switch cover, the diaphragm main part is made of the soft elastomeric material of can deform, in the switch cover inside embedding has with the water outlet size of water inlet pipe corresponding stainless steel counterweight board, in the upper circumference of outer tube is evenly distributed with a plurality of to the diaphragm and its switch cover positioning guide vertical reinforcement, the bottom surface all around of switch cover is set into with the shape of the water outlet of water inlet pipe matched sealing ring. The utility model discloses through to the optimization design of outer tube structure and diaphragm structure, has realized the soft sealing, effectively solved the water leakage problem of one -way drainage valve.

Description

Technical Field

[0001] This utility model relates to the field of one-way drainage valve technology, and in particular to a one-way drainage valve and a composite ecological geomembrane made therefrom. Background Technology

[0002] One-way drainage composite ecological geomembrane, when applied in slope protection engineering, combines multiple functions such as seepage prevention and one-way drainage pressure relief. It can drain seepage water from the excavated slope foundation and effectively intercept external water sources from seeping into the slope foundation, thus maintaining the balance between groundwater and surface water. The thinner the one-way drainage valve structure that makes up this one-way drainage composite ecological geomembrane, the easier its construction and use.

[0003] In the prior art, Chinese utility model patent application number 202222850239.0 (publication number CN218377848 U) discloses a one-way drainage valve; Chinese invention patent application number 202210804877.0 (publication number CN114875978B) discloses a one-way drainage valve and a composite ecological geomembrane thereof. The one-way drainage valves provided in the above technologies all consist of an inlet cylinder, an outer cylinder, a cylindrical plug sealing the upper outlet of the inlet cylinder, and an upper cover. To make the one-way drainage valve thinner, the cylindrical plug can be made into a thin-film switch cover. However, the seal between the membrane-like switch cover and the inlet cylinder relies solely on the weight of the switch cover, which may sometimes lead to leakage.

[0004] The applicant of this utility model has also applied for and disclosed a one-way water stop valve (publication number CN218178025U, application number 202222850222.5), the main technical solution of which is: including a water inlet cylinder, an outer cylinder mechanism with drainage holes around the periphery of the water inlet cylinder being threadedly connected, an arched protective cover mechanism being provided on the top of the outer cylinder mechanism and fixed to the outer cylinder mechanism; an elastic sealing plug mechanism that can realize the opening or closing of the water inlet cylinder is provided between the inner side of the arched protective cover mechanism and the top of the water inlet cylinder. The elastic sealing plug mechanism is a membrane-shaped switch cover, which closes tightly over the outlet of the inlet cylinder to attempt to seal it. The membrane-shaped switch cover has a wing-ring structure made of elastic rubber material around its periphery, used to fix it to the inner wall of the protective cover mechanism or the outer cylinder mechanism. That is, the elastic sealing plug mechanism moves up and down to open and close the outlet (upper opening) of the inlet cylinder through the stretching of the wing-ring structure. A space is provided between the elastic sealing plug mechanism and the inner arch of the arched protective cover mechanism for upward movement of the elastic sealing plug mechanism. A mesh-like support mechanism for the sealing cover is provided on the inner wall of the inlet cylinder. However, this one-way stop valve still has problems with displacement and poor sealing performance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a one-way drainage valve and a composite ecological geomembrane composed therefrom. By optimizing the structure of the outer cylinder and the membrane, a soft seal is achieved, which effectively solves the leakage problem of the one-way drainage valve.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A one-way drain valve includes an inlet cylinder, an outer cylinder connected to the outer periphery of the inlet cylinder, a diaphragm disposed on the inlet cylinder, and an upper cover covering the outer cylinder and the diaphragm. The diaphragm includes a switch cover for opening or closing the outlet of the inlet cylinder and a wing ring structure integrally connected to the switch cover. The main body of the diaphragm is made of a deformable soft elastic material. A stainless steel counterweight plate corresponding to the size of the outlet of the inlet cylinder is embedded inside the switch cover. Several guide ribs are evenly distributed around the upper circumference of the outer cylinder to position the diaphragm and its switch cover. A sealing ring is formed around the bottom surface of the switch cover to match the shape of the outlet of the inlet cylinder.

[0007] A further improvement of this utility model is that the top of the water outlet of the water inlet cylinder is configured with an inner conical slope and an outer conical slope for internal and external sealing cooperation, and the sealing ring of the switch cover is configured with an inner cone and an annular thin edge that respectively cooperate with the inner conical slope and the outer conical slope of the water outlet of the water inlet cylinder.

[0008] A further improvement of this utility model is that the diaphragm is formed by hot vulcanization of silicone, and the stainless steel counterweight plate is pre-placed inside the switch cover before forming, and the metal-rubber composite is achieved through the insert hot vulcanization forming process.

[0009] A further improvement of this utility model is that the connection between the wing ring structure and the switch cover is set as an upwardly convex curved surface.

[0010] A further improvement of the present invention is that the surface is a sinusoidal wave surface.

[0011] A further improvement of this utility model is that: a plurality of vertical rib holes that cooperate with the guide ribs are evenly distributed circumferentially on the wing ring structure around the switch cover; a fixing hole for fastening the diaphragm to the outer cylinder is provided on the edge of the wing ring structure; a downwardly extending annular flange is provided on the outer ring of the wing ring structure, the bottom end and inner wall of the annular flange form a contact seal with the outer cylinder, and the outer wall of the annular flange forms a contact seal with the inner wall of the upper cover circle.

[0012] A further improvement of this utility model's technical solution is that: the water inlet cylinder includes a base, several radially arranged water collecting baffles evenly distributed at the bottom of the base, a first vertical cylinder perpendicular to the base, and a support mechanism positioned at the upper part of the inner cavity of the first vertical cylinder; the water collecting baffles adopt a wedge-shaped design, forming a radial water collecting channel between adjacent water collecting baffles; the first vertical cylinder adopts a through-cavity cylindrical design, with an inner conical slope and an outer conical slope set at the top of the first vertical cylinder, and an external thread set at the lower part of the first vertical cylinder; the support mechanism is a hollow mesh structure that allows water to pass through.

[0013] A further improvement of the present invention is that: the outer cylinder includes a circular base, a second vertical cylinder perpendicular to the base, and a plurality of radially distributed hydrophobic baffles along the outer periphery of the second vertical cylinder; adjacent hydrophobic baffles form drainage channels distributed at equal angles; the guide ribs are arranged in annular array at the top of the second vertical cylinder; the second vertical cylinder adopts a through-cavity cylindrical design, and its inner wall is machined with an internal thread that mates with the external thread of the lower part of the first vertical cylinder.

[0014] A further improvement of the present invention is that: a snap-fit ​​structure for fixing the membrane is provided above the end of the hydrophobic baffle away from the second vertical cylinder; a sealing platform that cooperates with the annular flange of the membrane is provided below the outer side of the snap-fit ​​structure; and a connecting end for fixing the upper cover is provided below the outer side of the sealing platform.

[0015] A further improvement of this utility model is that the bottom end of the upper cover and the connecting end are permanently connected together using a high-frequency induction welding process.

[0016] A composite ecological geomembrane equipped with a one-way drainage valve comprises an ecological geomembrane and a plurality of one-way drainage valves sequentially arranged therein. The ecological geomembrane includes a lower permeable geotextile layer, a geomembrane layer with mounting holes, and an upper permeable geotextile layer. The one-way drainage valve passes through the mounting holes and is fixed to the geomembrane layer by an inlet cylinder and an outer cylinder constituting the one-way drainage valve. Simultaneously, the upper permeable geotextile layer covers the geomembrane layer and the arched top cover of the one-way drainage valve. The lower permeable geotextile layer is located below the water collection baffle of the inlet cylinder of the geomembrane layer and the one-way drainage valve, meaning the one-way drainage valve is sandwiched between the lower and upper permeable geotextile layers, forming an outlet space between the periphery of the top cover and the geomembrane layer.

[0017] The technological advancements achieved by this utility model due to the adoption of the above technical solution are as follows: 1. This utility model effectively enhances the sealing effect of the diaphragm by setting guide ribs on the outer cylinder, setting the outer periphery of the diaphragm's wing ring structure as a wavy curved surface, setting a thin annular edge at the bottom of the diaphragm that contacts the conical sealing surface on the water inlet cylinder, and setting a stainless steel counterweight plate inside the diaphragm's switch cover. This effectively solves the leakage problem of the one-way drain valve and extends its service life.

[0018] 2. This utility model sets a stainless steel counterweight plate inside the switch cover of the diaphragm, which not only realizes the counterweight function, allowing the diaphragm to achieve sealing by its own weight, but also enables the one-way drain valve to be sealed even after the rubber has aged and disappeared after several years.

[0019] 3. This utility model effectively corrects the diaphragm's misalignment by evenly distributing guide ribs around the outer cylinder. Even after the rubber ages and disappears after several years, it can still ensure that the stainless steel counterweight plate set inside the switch cover does not shift and can also provide a sealing effect.

[0020] 4. By setting the outer periphery of the diaphragm's wing ring structure as a wavy curved surface, this utility model enables the outermost ring of the wing ring structure to remain fixed after the diaphragm is clamped and fixed by the upper cover and the outer cylinder. The wavy curved surface structure of the outer periphery ensures that the center will not shift after the upper cover is opened and moved up and down, and will not cause tension on the diaphragm, thereby increasing the service life of the diaphragm.

[0021] 5. This utility model has an annular thin edge at the bottom of the diaphragm that contacts the conical sealing surface on the water inlet cylinder. When the diaphragm contacts the conical sealing surface on the water inlet cylinder, the diaphragm will deform slightly, and the annular thin edge can make line contact with the conical sealing surface of the water inlet cylinder, so that the one-way drain valve can effectively seal even under low pressure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the installation of the one-way drainage valve and the geomembrane layer provided in this embodiment of the utility model; Figure 2 This is a cross-sectional view of the installation of the one-way drainage valve and the geomembrane layer provided in this embodiment of the utility model; Figure 3 This is an exploded view of the one-way drain valve provided in the embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the water inlet cylinder in an embodiment of this utility model; Figure 5 This is a schematic diagram of the outer cylinder in an embodiment of this utility model; Figure 6 This is a schematic diagram of the diaphragm structure in an embodiment of this utility model. Figure 1 ; Figure 7This is a schematic diagram of the diaphragm structure in an embodiment of this utility model. Figure 2 ; Figure 8 This is a schematic diagram of the structure of the upper cover in an embodiment of this utility model; The components are as follows: 1. Inlet cylinder; 1-1. Water collection baffle; 1-2. Base; 1-3. First vertical cylinder; 1-4. Support mechanism; 2. Outer cylinder; 2-1. Chassis; 2-2. Second vertical cylinder; 2-3. Drainage baffle; 2-3-1. Clip structure; 2-3-2. Sealing platform; 2-3-3. Connecting end; 2-4. Guide rib; 3. Diaphragm; 3-1. Wing ring structure; 3-1-1. Rib hole; 3-1-2. Fixing hole; 3-1-3. Annular flange; 3-2. Switch cover; 3-2-1. Stainless steel counterweight plate; 3-3. Annular thin edge; 4. Top cover; 5. Geomembrane layer. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments: like Figures 1-8 As shown, a one-way drain valve includes an inlet cylinder 1, an outer cylinder 2 connected to the outer periphery of the inlet cylinder 1, a diaphragm 3 disposed on the inlet cylinder 1, and an upper cover 4 covering the outer cylinder 2 and the diaphragm 3. The diaphragm 3 includes a switch cover 3-2 for opening or closing the outlet of the inlet cylinder 1 and a wing ring structure 3-1 integrally connected with the switch cover 3-2. The main body of the diaphragm 3 is made of a deformable soft elastic material. A stainless steel counterweight plate 3-2-1 corresponding to the size of the outlet of the inlet cylinder 1 is embedded inside the switch cover 3-2. Several guide ribs 2-4 are evenly distributed around the upper periphery of the outer cylinder 2 to position the diaphragm 3 and its switch cover 3-2. A sealing ring is provided around the bottom surface of the switch cover 3-2 to match the shape of the outlet of the inlet cylinder 1.

[0024] Furthermore, the top of the outlet of the water inlet cylinder 1 is configured with an inner conical slope and an outer conical slope for internal and external sealing cooperation, and the sealing ring of the switch cover 3-2 is configured with an inner cone and an annular thin edge 3-3 that respectively cooperate with the inner conical slope and the outer conical slope of the outlet of the water inlet cylinder 1.

[0025] Specifically, in practical application, after fixing the diaphragm 3 onto the outer cylinder 2, the upper cover 4 is high-frequency welded onto the outer cylinder 2. The water inlet cylinder 1 passes through the mounting hole on the geomembrane layer 5, and then the outer cylinder 2 is screwed onto the water inlet cylinder 1 to complete the assembly. The guide ribs 2-4 can be set to 6-8 guide ribs; this utility model uses 6. The working surface of the guide ribs 2-4 forms a 2º~3º guide angle with the vertical plane. The conical sealing surface (inner conical slope and outer conical slope) of the water inlet cylinder 1 can be set to 15º~20º. The stainless steel counterweight plate 3-2-1 can be made of 304 / 316 stainless steel to meet the requirements for corrosion resistance and counterweight. The thickness of the annular thin edge 3-3 can be varied in gradient (0.5~1.2mm), and a 0.2mm thick aramid fiber reinforcement layer is provided at the thinnest part of the annular thin edge 3-3; the gradually thinning design of the annular thin edge 3-3 enables it to maintain effective sealing contact within a pressure range of 0.01~0.3MPa.

[0026] Furthermore, such as Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, the diaphragm 3 is formed by silicone thermocuring, exhibiting excellent elasticity and fatigue resistance. Before molding, a stainless steel counterweight plate 3-2-1 is pre-placed inside the switch cover 3-2. A metal-rubber composite is achieved through an insert thermocuring process, with molecular-level encapsulation during silicone thermocuring to form a permanent seal. The stainless steel counterweight plate 3-2-1 is integrated into the top area of ​​the switch cover 3-2, ensuring optimized overall center of gravity. The wing ring structure 3-1 forms a gapless composite with the stainless steel counterweight plate 3-2-1 through a thermocuring process. Figure 2 , Figure 3 , Figure 6 , Figure 7 The small holes on the stainless steel counterweight plate 3-2-1 seen above are left by the pre-set fixing device of the mold. The stainless steel counterweight plate 3-2-1 is completely covered with silicone.

[0027] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, the connection between the wing ring structure 3-1 and the switch cover 3-2 is designed as an upwardly convex curved surface.

[0028] Furthermore, such as Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7As shown, the surface is a sinusoidal wave surface. The amplitude ratio of the sinusoidal wave surface on the outer periphery of the wing ring structure 3-1 can be set to 1:1.2~1.5. The wing ring structure 3-1 with a wave-shaped outer periphery can produce axial compression deformation (deformation rate ≥30%) and radial expansion deformation under the action of fluid pressure.

[0029] Furthermore, such as Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, the wing ring structure 3-1 around the switch cover 3-2 has several vertical rib holes 3-1-1 evenly distributed around it to cooperate with the guide ribs 2-4; the edge of the wing ring structure 3-1 is provided with fixing holes 3-1-2 for mounting the diaphragm 3 onto the outer cylinder 2; the outer ring of the wing ring structure 3-1 is provided with a downwardly extending annular flange 3-1-3, the bottom end and inner wall of the annular flange 3-1-3 form a contact seal with the outer cylinder 2, and the outer wall of the annular flange 3-1-3 forms a contact seal with the inner wall of the circle of the upper cover 4.

[0030] Furthermore, such as Figure 2 , Figure 3 , Figure 4 As shown, the water inlet cylinder 1 includes a base 1-2, several radially arranged water collecting baffles 1-1 evenly distributed at the bottom of the base 1-2, a first vertical cylinder 1-3 perpendicular to the base 1-2, and a support mechanism 1-4 positioned at the upper part of the inner cavity of the first vertical cylinder 1-3; the water collecting baffles 1-1 adopt a wedge-shaped design, and a radial water collecting channel is formed between adjacent water collecting baffles 1-1; the first vertical cylinder 1-3 adopts a through-cavity cylindrical design, with an inner conical inclined surface and an outer conical inclined surface set at the top of the first vertical cylinder 1-3, and an external thread set at the lower part of the first vertical cylinder 1-3; the support mechanism 1-4 is a hollow mesh structure that allows water to pass through.

[0031] Furthermore, such as Figure 2 , Figure 3 , Figure 5 As shown, the outer cylinder 2 includes a circular base plate 2-1, a second vertical cylinder 2-2 perpendicular to the base plate 2-1, and several radially distributed drainage baffles 2-3 along the outer periphery of the second vertical cylinder 2-2; adjacent drainage baffles 2-3 form drainage channels distributed at equal angles; guide ribs 2-4 are arranged in a ring array at the top of the second vertical cylinder 2-2; the second vertical cylinder 2-2 adopts a through-cavity cylindrical design, and its inner wall is machined with an internal thread that mates with the external thread of the lower part of the first vertical cylinder 1-3.

[0032] Furthermore, such as Figure 5As shown, a snap-fit ​​structure 2-3-1 for fixing the diaphragm 3 is provided above the end of the hydrophobic baffle 2-3 away from the second vertical cylinder 2-2. A sealing platform 2-3-2 that mates with the annular flange 3-1-3 of the diaphragm 3 is provided below the outer side of the snap-fit ​​structure 2-3-1. A connecting end 2-3-3 for fixing the upper cover 4 is provided below the outer side of the sealing platform 2-3-2.

[0033] Specifically, the hydrophobic baffle 2-3 adopts a three-stage stepped structure design, which realizes the following functions from the inside out: fixing function of diaphragm 3 (clamping structure 2-3-1), sealing support function (sealing platform 2-3-2), and bottom connection function of upper cover 4 (connecting end 2-3-3); the clamping structure 2-3-1 is located on the upper part of the outer end of the hydrophobic baffle 2-3 and adopts an interference fit design; it realizes the radial positioning and circumferential limiting of diaphragm 3; the sealing platform 2-3-2 is a precision-machined annular plane with a flatness of ≤0.1mm, which is used to support the annular flange 3-1-3 to form an axial sealing surface; the structural setting of the connecting end 2-3-3 can meet the high-frequency welding requirements of upper cover 4.

[0034] Furthermore, such as Figure 1 , 2 As shown, the bottom end of the top cover 4 and the connecting end 2-3-3 are permanently connected together using a high-frequency induction welding process. The welding area undergoes precision pretreatment (de-oxidation + alcohol cleaning). The welding frequency is 300-450kHz, adaptively adjusted according to the material.

[0035] Furthermore, such as Figure 8 As shown, the upper cover 4 is an arc-shaped cover structure with weight-reducing grooves on its outer wall and top. The bottom of the upper cover 4 can be fixed together with the connecting end 2-3-3, thereby permanently sealing the diaphragm on the outer cylinder 2.

[0036] A composite ecological geomembrane equipped with a one-way drainage valve is composed of an ecological geomembrane and several one-way drainage valves arranged therein in sequence. The ecological geomembrane includes a lower permeable geotextile layer, a geomembrane layer 5 with installation holes, and an upper permeable geotextile layer. The one-way drainage valve passes through the installation holes and is fixed to the geomembrane layer 5 by an inlet cylinder 1 and an outer cylinder 2 constituting the one-way drainage valve. At the same time, the upper permeable geotextile layer covers the geomembrane layer 5 and the arched cover 4 of the one-way drainage valve. The lower permeable geotextile layer is located below the water collection baffle 1-1 of the inlet cylinder 1 of the geomembrane layer 5 and the one-way drainage valve. That is, the one-way drainage valve is sandwiched between the lower permeable geotextile layer and the upper permeable geotextile layer, forming a water outlet space between the periphery of the cover 4 and the geomembrane layer 5.

[0037] Working principle: When the water in the foundation reaches a certain pressure, it pushes up the middle of the wave-shaped wing ring structure 3-1 through the water collection channel and inlet of the water inlet cylinder 1, which is blocked at the opening of the first vertical cylinder 1-3 of the water inlet cylinder 1. Because the outer periphery of the wing ring structure 3-1 is fastened to the locking structure 2-3-1 through the fixing hole 3-1-2, a water outlet gap is formed around the opening of the first vertical cylinder 1-3 of the water inlet cylinder 1. The water in the foundation flows through the gap to the drainage channel of the outer cylinder 2 and flows out of the valve body of the one-way drain valve. When the water pressure in the foundation drops, the wave-shaped wing ring structure 3-1 elastically contracts, causing the switch cover 3-2 to drop and return to its original state, closing the opening of the water inlet cylinder 1.

[0038] In the use of a composite ecological geomembrane equipped with a one-way drainage valve, the lower permeable geotextile layer is in contact with the base surface. The seepage water of the foundation seeps into the water collection channel and inlet that constitute the water inlet cylinder 1 of the one-way drainage valve through the lower geotextile layer and is discharged from the valve body. It is then discharged through the upper permeable geotextile layer that covers it, thereby realizing the one-way discharge of high-pressure water from the foundation to ensure the safe operation of the water conservancy project.

[0039] The composite ecological geomembrane, consisting of an ecological geomembrane and several one-way drainage valves arranged sequentially within it, not only has the characteristics of being able to be rolled up at will, having one-way drainage and no leakage in reverse, but also being easy to use and construct as it can be laid on the foundation of water conservancy projects.

Claims

1. A one-way drain valve, comprising an inlet cylinder (1), an outer cylinder (2) connected to the outer periphery of the inlet cylinder (1), a diaphragm (3) disposed on the inlet cylinder (1), and an upper cover (4) covering the outer cylinder (2) and the diaphragm (3); the diaphragm (3) includes a switch cover (3-2) for opening or closing the outlet of the inlet cylinder (1) and a wing ring structure (3-1) integrally connected with the switch cover (3-2); characterized in that: The diaphragm (3) is made of a deformable soft elastic material. A stainless steel counterweight plate (3-2-1) corresponding to the size of the outlet of the water inlet cylinder (1) is embedded inside the switch cover (3-2). Several guide ribs (2-4) are evenly distributed around the top of the outer cylinder (2) to position the diaphragm (3) and its switch cover (3-2). The bottom surface of the switch cover (3-2) is provided with a sealing ring that matches the shape of the outlet of the water inlet cylinder (1).

2. The one-way drain valve according to claim 1, characterized in that: The top of the outlet of the water inlet cylinder (1) is configured with an inner conical slope and an outer conical slope for internal and external sealing. The sealing ring of the switch cover (3-2) is configured with an inner cone and an annular thin edge (3-3) that respectively cooperate with the inner conical slope and the outer conical slope of the outlet of the water inlet cylinder (1).

3. A one-way drain valve according to claim 1, characterized in that: The diaphragm (3) is formed by hot vulcanization of silicone. Before forming, the stainless steel counterweight plate (3-2-1) is pre-placed inside the switch cover (3-2). The metal-rubber composite is achieved through the insert hot vulcanization process.

4. A one-way drain valve according to claim 1, characterized in that: The connection between the wing ring structure (3-1) and the switch cover (3-2) is configured as an upwardly convex curved surface.

5. A one-way drain valve according to claim 4, characterized in that: The surface is a sinusoidal wave surface.

6. A one-way drain valve according to claim 1, characterized in that: The wing ring structure (3-1) around the switch cover (3-2) has several rib holes (3-1-1) that cooperate with the guide ribs (2-4) evenly distributed around it; the edge of the wing ring structure (3-1) is provided with fixing holes (3-1-2) for attaching the diaphragm (3) to the outer cylinder (2); the outer ring of the wing ring structure (3-1) is provided with a downwardly extending annular flange (3-1-3), the bottom end and inner wall of the annular flange (3-1-3) form a contact seal with the outer cylinder (2), and the outer wall of the annular flange (3-1-3) forms a contact seal with the inner wall of the circle of the upper cover (4).

7. A one-way drain valve according to claim 1, characterized in that: The water inlet cylinder (1) includes a base (1-2), several radially arranged water collecting baffles (1-1) evenly distributed on the bottom of the base (1-2), a first vertical cylinder (1-3) perpendicular to the base (1-2), and a support mechanism (1-4) positioned on the upper part of the inner cavity of the first vertical cylinder (1-3); the water collecting baffles (1-1) adopt a wedge-shaped design, and a radial water collecting channel is formed between adjacent water collecting baffles (1-1); the first vertical cylinder (1-3) adopts a through-cavity cylindrical design, with an inner conical inclined surface and an outer conical inclined surface set on the top of the first vertical cylinder (1-3), and an external thread is provided on the lower part of the first vertical cylinder (1-3); the support mechanism (1-4) is a hollow mesh structure that allows water to pass through.

8. A one-way drain valve according to claim 1, characterized in that: The outer cylinder (2) includes a circular base (2-1), a second vertical cylinder (2-2) perpendicular to the base (2-1), and a plurality of radially distributed hydrophobic baffles (2-3) along the outer periphery of the second vertical cylinder (2-2); adjacent hydrophobic baffles (2-3) form drainage channels distributed at equal angles; the guide ribs (2-4) are arranged in a ring at the top of the second vertical cylinder (2-2); the second vertical cylinder (2-2) adopts a through-cavity cylindrical design, and its inner wall is machined with an internal thread that matches the external thread of the lower part of the first vertical cylinder (1-3).

9. A one-way drain valve according to claim 8, characterized in that: The hydrophobic baffle (2-3) is provided with a snap-fit ​​structure (2-3-1) for fixing the diaphragm (3) above the end away from the second vertical cylinder (2-2). A sealing platform (2-3-2) that cooperates with the annular flange (3-1-3) of the diaphragm (3) is provided below the outer side of the snap-fit ​​structure (2-3-1). A connecting end (2-3-3) for fixing the top cover (4) is provided below the outer side of the sealing platform (2-3-2).

10. A one-way drain valve according to claim 9, characterized in that: The bottom end of the upper cover (4) and the connecting end (2-3-3) are permanently connected together by high-frequency induction welding.

11. A composite ecological geomembrane, provided with a one-way drainage valve as described in any one of claims 1-10, characterized in that: It is composed of an ecological geomembrane and several one-way drainage valves arranged therein in sequence; wherein, the ecological geomembrane includes a lower permeable geotextile layer, a geomembrane layer (5) with installation holes and an upper permeable geotextile layer; the one-way drainage valve passes through the installation holes and is fixed on the geomembrane layer (5) by the inlet cylinder (1) and the outer cylinder (2) constituting the one-way drainage valve. At the same time, the upper permeable geotextile layer covers the geomembrane layer (5) and the arched cover (4) of the one-way drainage valve. The lower permeable geotextile layer is located below the water collection baffle (1-1) of the inlet cylinder (1) of the geomembrane layer (5) and the one-way drainage valve. That is, the one-way drainage valve is sandwiched between the lower permeable geotextile layer and the upper permeable geotextile layer, and a water outlet space is formed between the periphery of the cover (4) and the geomembrane layer (5).

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