Landfill leachate drainage device

Abstract

The invention discloses a landfill leachate drainage device, which comprises a tank body, the bottom end of the tank body is buried in a landfill, the top end of the tank body is exposed, and a liquid inlet hole is formed in the side wall close to the bottom end; the liquid inlet opening and closing mechanism is located in the tank body and comprises a mounting frame, a transmission rod, a driving airbag and a baffle, the mounting frame sinks in the tank body, the transmission rod is hinged to the mounting frame, the first end of the transmission rod is in transmission connection with the driving end of the driving airbag, and the second end of the transmission rod is hinged to the baffle; the suction end of the liquid suction mechanism is located at the low position in the tank body. The air bag is driven to be inflated and deflated to drive the transmission rod to enable the baffle to open and close the liquid inlet hole, and the problems that metal parts of an existing device are prone to being corroded by percolate, the structure is complex, the fault rate is high, and the maintenance cost is high are solved through cooperation of liquid pumping of the liquid pumping mechanism.

Description

Technical Field

[0001] This invention relates to the field of landfill leachate drainage technology, and more specifically to a landfill leachate drainage device. Background Technology

[0002] In the operation of solid waste landfills, the timely collection and discharge of leachate is crucial to prevent its accumulation at the bottom of the landfill, which could lead to slope instability, groundwater pollution, or environmental accidents. Current technologies generally employ a drainage ditch system combined with a mechanical pump lifting mechanism: the drainage ditch contains drainage pipes and a layer of gravel, and the collected leachate is lifted to a regulating tank by a submersible pump in a pump well. These pump wells typically rely on an electric submersible pump (e.g., made of stainless steel) as the core drive component, supplemented by auxiliary components such as guide rails and chains to achieve pump lifting and positioning.

[0003] However, leachate is highly corrosive (containing organic acids, heavy metal ions, and high concentrations of salts), leading to serious defects in existing systems over long-term operation. Industry data shows that in typical landfill environments, the annual failure rate of pump well systems is as high as 30-40%, mainly due to the following reasons:

[0004] Equipment failure caused by material corrosion: Metal components such as electric pumps, guide rails, and chains are directly exposed to leachate, leading to rapid corrosion and pitting. For example, stainless steel pump bodies often experience seal failure or impeller damage within 6-12 months, requiring frequent replacement; corrosion-induced jamming of guide rails can cause the pump body to remain permanently inside the well, resulting in equipment loss and interruption of drainage. This corrosion problem not only shortens the lifespan of the equipment (averaging less than 2 years) but also increases the environmental risk of unexpected downtime.

[0005] Low mechanical reliability leads to operational instability: The system relies on complex moving parts such as motors and bearings, which are prone to jamming or electrical failures under harsh operating conditions. Power outages, vibrations, or component wear often force shutdowns for maintenance, affecting the continuous discharge of leachate. Especially in remote landfills or older facilities, such failures have led to multiple leachate overflow incidents, with repair costs accounting for more than 40% of total operating expenses.

[0006] High maintenance requirements and operational complexity: Maintenance personnel must penetrate deep into the pump well to replace or repair components, a time-consuming and dangerous process. The energy dependence of electric pumps (requiring continuous power supply) limits their application in areas prone to power outages, while frequent maintenance (3-5 times per year) directly drives up operating costs. The industry has attempted to use protective coatings or composite material upgrades, but these methods cannot completely eliminate the corrosion and degradation of moving parts.

[0007] Therefore, how to provide a new landfill leachate drainage device that is corrosion resistant while also having a simple structure and high stability is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0008] In view of this, the present invention provides a landfill leachate drainage device, which aims to solve the technical problems of the above-mentioned traditional landfill leachate drainage devices being complex in structure and not resistant to corrosion.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] A landfill leachate drainage device, comprising:

[0011] The tank body has its bottom end buried in the landfill, while its top end is exposed on the site surface. The side wall of the tank body has a liquid inlet near its bottom end.

[0012] The liquid inlet opening and closing mechanism is located inside the tank and includes a mounting bracket, a transmission rod, a drive airbag, and a baffle. The mounting bracket is slidably connected to the inner wall of the tank and sinks to a low position inside the tank under its own weight. The transmission rod is hinged to the mounting bracket, and its hinge point has a distance between the projection of the liquid inlet in the horizontal direction and the opening stroke. The fixed end of the drive airbag is fixedly connected to the mounting bracket. The first end of the transmission rod is driven by the drive end of the drive airbag, and the second end of the transmission rod is hinged to the baffle. The shape of the transmission rod is configured such that the baffle can open and close the liquid inlet during the inflation and deflation of the drive airbag by an external air source device.

[0013] The liquid extraction mechanism has its suction end located at a low position inside the tank to extract wastewater entering the tank.

[0014] Through the above technical solution, this invention uses a telescopic airbag as the driving element in the inlet opening and closing mechanism, instead of a traditional electric pump or metal parts, thus avoiding direct corrosion from high-concentration organic acids and heavy metal ions in the leachate. This significantly reduces the risk of failure due to component corrosion. Furthermore, the entire opening and closing mechanism relies on pneumatic principles (inflation and deflation of the telescopic airbag) and gravity, eliminating the need for moving parts such as motors, bearings, or chains. This eliminates the risk of downtime due to mechanical jamming or electrical failures, and features high corrosion resistance and stability.

[0015] Preferably, the driving end of the driving airbag is arranged upward and within the spacing range. The transmission rod includes an L-shaped transmission rod segment, a hinged rod segment, and a connecting rod segment connected in sequence. The free end of the L-shaped transmission rod segment is in transmission contact with the driving end of the driving airbag. The hinged rod segment is hinged to the mounting bracket. The connecting rod segment is arranged at an angle to the hinged rod segment and its free end is arranged near the liquid inlet. The baffle is hinged to the free end of the connecting rod segment.

[0016] Preferably, the mounting frame includes two parallel spaced ring plates and a support rod that is fastened to the opposite surfaces of the two ring plates. The two ring plates are coaxially arranged and their side walls are slidably connected to the inner wall of the tank. The fixed end of the driving airbag is fixedly connected to the upper plate surface of the upper ring plate, and the hinged rod segment is hinged to the upper plate surface of the upper ring plate.

[0017] Preferably, the liquid inlet opening and closing mechanism further includes a support plate and a rotating shaft. The two support plates are symmetrically arranged on both sides of the driving airbag and are fixedly connected to the upper plate surface of the ring plate located above. Rotating holes are provided on the opposite surfaces of the two support plates. The two ends of the rotating shaft are fixedly connected to the two rotating holes respectively, and the hinged rod segment is rotatably connected to the rotating shaft.

[0018] Preferably, the liquid inlet opening and closing mechanism further includes a connecting plate, which is fixedly connected to the driving end of the driving airbag, and the free end of the L-shaped transmission rod segment is in transmission contact with the connecting plate.

[0019] Preferably, the liquid inlet opening and closing mechanism further includes a limiting ring, which is sleeved around the periphery of the driving airbag and fixedly connected to the upper plate surface of the ring plate located above. The top end of the limiting ring is arranged opposite to the lower plate surface of the connecting plate to limit the lowest position of the driving airbag during the deflation process.

[0020] Preferably, the free end of the connecting rod segment is rotatably connected to the upper middle position of the baffle plate surface facing away from the liquid inlet.

[0021] Preferably, there are two transmission rods, which are arranged in parallel and spaced apart.

[0022] Preferably, the liquid inlet opening and closing mechanism further includes a counterweight, which is fixedly connected to the telescopic end of the driving airbag.

[0023] Preferably, it also includes an air pump, which is connected to the drive airbag via an air supply line.

[0024] As can be seen from the above technical solution, compared with the prior art, the present invention provides a solution with the following beneficial effects: It uses a driving airbag (a non-metallic flexible component) as the power source for opening and closing, replacing the traditional electric pump and metal transmission components, thus avoiding corrosion of the metal by high concentrations of organic acids and heavy metals in the leachate, and significantly reducing the risk of equipment failure; the baffle opening and closing is achieved through the airbag inflation and deflation + transmission rod lever principle, eliminating the need for complex moving parts such as motors and bearings, reducing the risk of downtime due to mechanical jamming and electrical failures, and improving long-term operational stability; the suction end of the liquid extraction mechanism is located at the low position of the tank, which can fully extract the leachate entering the tank and avoid residual accumulation. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 The attached figure is a schematic diagram of the structure and site layout of a landfill leachate drainage device provided by the present invention;

[0027] Figure 2 for Figure 1 A magnified view of a section at point A;

[0028] Figure 3 for Figure 1 A magnified view of section B;

[0029] Figure 4 for Figure 1 Sectional view at CC;

[0030] Figure 5 The attached figure is a structural schematic diagram of the liquid inlet opening and closing mechanism and the mounting bracket provided by the present invention in the assembled state (airbag inflated state);

[0031] Figure 6 The attached figure is a structural schematic diagram of the liquid inlet opening and closing mechanism and the mounting bracket provided by the present invention in the assembly state (airbag deflation state).

[0032] in:

[0033] 1-Tank body; 2-Liquid inlet opening and closing mechanism; 3-Liquid pumping mechanism; 10-Landfill; 20-Gas pipeline; 11-Tank body; 12-Top cover; 21-Drive airbag; 22-Transmission rod; 23-Baffle; 24-Mounting bracket; 25-Support plate; 26-Rotating shaft; 27-Connecting plate; 28-Limiting ring; 29-Counterweight; 31-Drain pipe; 32-In-tank pressure relief valve; 33-Pressurization pipeline; 111-Liquid inlet; 201-Main gas valve; 202-Gas pressure relief valve; 203-Gas input port; 221-L-shaped transmission rod section; 222-Hinged rod section; 223-Connecting rod section; 241-Ring plate; 242-Support rod. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] See attached Figure 1 To be continued Figure 3 The present invention discloses a landfill leachate drainage device, comprising: a tank 1, an inlet opening and closing mechanism 2, and a pumping mechanism 3;

[0036] The bottom of the tank 1 can be buried in the landfill 10, and its top is exposed on the surface of the site. The side wall of the tank 1 is provided with a liquid inlet 111 near its bottom.

[0037] The liquid inlet opening and closing mechanism 2 is located inside the tank body 1 and includes a mounting frame 24, a transmission rod 22, a driving airbag 21, and a baffle 23. The mounting frame 24 is slidably connected to the inner wall of the tank body 1 and sinks to a low position inside the tank body 1 under its own weight. The rod body of the transmission rod 22 is hinged to the mounting frame 24, and its hinge point and the projection of the liquid inlet 111 in the horizontal direction have a distance of the opening stroke. The fixed end of the driving airbag 21 is fixedly connected to the mounting frame 24. The first end of the transmission rod 22 is connected to the driving end of the driving airbag 21, and the second end of the transmission rod 22 is hinged to the baffle. The shape of the transmission rod is configured such that the baffle can open and close the liquid inlet 111 during the inflation and deflation of the driving airbag 21 by the external air source equipment.

[0038] The suction end of the liquid extraction mechanism 3 is located at a low position inside the tank 1 to extract the wastewater that enters the tank 1.

[0039] Specifically, the tank 1 includes a tank body 11 with an opening at the top, and a top cover 12 that covers and is detachably connected to the opening at the top of the tank body 11.

[0040] Specifically, the mounting bracket 24 is slidably connected to the inner wall of the tank 1 along the height direction of the tank 1. When replacement is required, the top cover 12 can be opened and the mounting bracket 24 can be taken out.

[0041] See attached Figure 2 To be continued Figure 3 The liquid extraction mechanism 3 includes a drain pipe 31, a pressurizing pipe 33, and an in-tank pressure relief valve 32. One end of the drain pipe 31 is located at a low position inside the tank body 11, and the other end passes through the side wall of the tank body 11 near its opening and protrudes outside the tank body 11, and is connected to the wastewater collection device. One end of the pressurizing pipe 33 is fixedly connected to the top cover 12 and is connected to the inside of the top cover 12. The other end of the pressurizing pipe 33 is connected to the pressurizing equipment. The pressurizing equipment pressurizes the inside of the tank 1 through the pressurizing pipe. The wastewater located at the bottom of the tank body 11 is discharged from the drain pipe 31 under pressure. The in-tank pressure relief valve 32 is installed on the pressurizing pipe 33 to control the pressure inside the tank 1.

[0042] See attached Figure 2The driving end of the driving airbag 21 is arranged upward and within the spacing range. The transmission rod 22 includes an L-shaped transmission rod segment 221, a hinged rod segment 222 and a connecting rod segment 223 connected in sequence. The free end of the L-shaped transmission rod segment 221 is in transmission contact with the driving end of the driving airbag 21. The hinged rod segment 222 is hinged to the mounting bracket 24. The connecting rod segment 223 is arranged at an angle to the hinged rod segment 222 and its free end is arranged on the side near the liquid inlet hole 111. The baffle is hinged to the free end of the connecting rod segment 223.

[0043] See appendix Figure 5 To be continued Figure 6 The mounting frame 24 includes two parallel, spaced-apart ring plates 241 and support rods 242 that are fastened to the opposite surfaces of the two ring plates 241. Both ring plates 241 are slidably connected to the inner wall of the tank body 1. The fixed end of the driving airbag 21 is fixedly connected to the upper surface of the upper ring plate 241, and the hinged rod segment 222 is hinged to the upper surface of the upper ring plate 241. Thus, the frame structure of the double ring plates 241 and support rods 242 provides rigid support for the driving airbag 21 and transmission rod 22, preventing component displacement caused by environmental vibration or leachate impact in the landfill 10, and ensuring long-term stable operation of the mechanism. The two ring plates 241 are fixed to the inner wall of the tank body 1, dispersing the forces of the driving airbag 21 and transmission rod 22, reducing local deformation of the tank body 1, and extending the service life of the tank body 1.

[0044] Specifically, the center of gravity of the transmission rod 22 and the baffle 23 in the assembled state is located between the hinge point of the hinge rod section 222 and the inner edge of the tank body 1. After the free end of the L-shaped transmission rod section 221 lacks support, the baffle 23 moves away from the liquid inlet hole 111.

[0045] See appendix Figure 4 The liquid inlet opening and closing mechanism 2 also includes a support plate 25 and a rotating shaft 26. The two support plates 25 are symmetrically arranged on both sides of the driving airbag 21 and are fixedly connected to the upper plate surface of the ring plate 241 located above. Rotating holes are provided on the opposite surfaces of the two support plates 25. The two ends of the rotating shaft 26 are fixedly connected to the two rotating holes respectively. The hinge rod segment 222 is rotatably connected to the rotating shaft 26.

[0046] In this embodiment, the liquid inlet opening and closing mechanism 2 further includes a connecting plate 27, which is fixedly connected to the driving end of the driving airbag 21, and the free end of the L-shaped transmission rod segment 221 is in transmission contact with the connecting plate 27. Thus, force is indirectly transmitted through the connecting plate 27, reducing the direct impact of the transmission rod 22 on the driving airbag 21 and extending the service life of the driving airbag 21.

[0047] In one embodiment, the liquid inlet opening / closing mechanism 2 further includes a limiting ring 28, which is sleeved around the periphery of the driving airbag 21 and fixedly connected to the upper surface of the ring plate 241 located above. The top end of the limiting ring 28 is arranged opposite to the lower surface of the connecting plate 27 to limit the lowest position of the driving airbag 21 during the deflation process. Thus, by limiting the lowest position of the driving airbag 21 during deflation by the limiting ring 28, wrinkles, ruptures, or permanent structural deformation of the driving airbag 21 due to excessive contraction are prevented, protecting the core components of the driving airbag 21. In addition, by limiting the contraction limit of the driving airbag 21, the rotation range of the transmission rod 22 is indirectly controlled, avoiding component collisions due to excessive rotation.

[0048] In some embodiments, the free end of the connecting rod segment 223 is rotatably connected to the upper middle position of the baffle 23 facing away from the liquid inlet hole 111.

[0049] In some other specific embodiments, there are two transmission rods 22, which are arranged in parallel and spaced apart.

[0050] In other embodiments, the liquid inlet opening and closing mechanism 2 further includes a counterweight 29, which is fixedly connected to the telescopic end of the driving airbag 21. Thus, the gravity of the counterweight 29 assists in the contraction action of the driving airbag 21 when it deflates.

[0051] In some other specific embodiments, an air pump is also included, which is connected to the drive airbag 21 via an air supply line 20.

[0052] See appendix Figure 1 To be continued Figure 3 The first end of the gas supply pipeline 20 is connected to the driving airbag 21, and the second end passes through the side wall of the tank body 11 near its opening and is exposed outside the tank body 11. It also includes a gas inlet port 203, a gas main valve 201 and a gas pressure relief valve 202. The second section of the gas supply pipeline 20 is connected to the air pump through the gas inlet port 203. The gas main valve 201 is installed on the gas supply pipeline 20 and is located between the gas inlet port 203 and the outer wall of the tank body 11. It is used to control the opening or closing of the gas passage between the air pump and the driving airbag 21. The gas pressure relief valve 202 is installed on the gas supply pipeline 20 and is located between the gas main valve 201 and the outer wall of the tank body 11. It is used to release air from the driving airbag 21.

[0053] The specific principle and usage of the landfill leachate drainage device provided in this embodiment are as follows:

[0054] When the inlet hole 111 is opened, the airbag 21 is deflated and contracted. Under the gravity of the counterweight 29, the driving end of the airbag 21 and the connecting plate 27 are moved downward. The free end of the L-shaped transmission rod section 221 lacks support and cannot support the blocking state of the baffle 23. Under the gravity of the baffle 23, the transmission rod 22 is driven to swing counterclockwise. After the baffle 23 is no longer blocking the inlet hole 111, the leachate enters the tank 1 through the inlet hole 111.

[0055] After the leachate enters the tank 1, it accumulates at the bottom. The pumping mechanism 3 pressurizes the inside of the tank 1 and inputs pressure through the pressurization pipe 33, so that the leachate at the lower level is discharged to the external collection device through the drain pipe 31 under pressure. The pressure relief valve 32 inside the tank is used to balance the pressure inside the tank and ensure the stability of the pumping process.

[0056] When the inlet hole 111 is closed, the drive airbag 21 is inflated, and the drive end of the drive airbag 21 and the connecting plate 27 move upward, applying an upward force along the height direction of the tank body 1 to the free end of the L-shaped transmission rod section 221, causing the transmission rod 22 to swing clockwise, and the baffle 23 to fit against the inlet hole 111, thereby closing it and preventing leachate from entering.

[0057] After the leachate enters the tank 1, it accumulates at the bottom. The pumping mechanism 3 pressurizes the inside of the tank 1 and inputs pressure through the pressurization pipe 33, so that the leachate at the lower level is discharged to the external collection device through the drain pipe 31 under pressure. The pressure relief valve 32 inside the tank is used to balance the pressure inside the tank and ensure the stability of the pumping process.

[0058] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A landfill leachate drainage device, characterized in that, include: Tank (1), the bottom end of which can be buried in the landfill (10), and the top end exposed on the surface of the site. A liquid inlet (111) is provided on the side wall of the tank (1) near its bottom end. The liquid inlet opening and closing mechanism (2) is located inside the tank (1) and includes a mounting frame (24), a transmission rod (22), a driving airbag (21), and a baffle (23). The mounting frame (24) is slidably connected to the inner wall of the tank (1) and sinks to a low position inside the tank (1) under its own weight. The rod body of the transmission rod (22) is hinged to the mounting frame (24), and its hinge point has an opening stroke distance from the projection of the liquid inlet (111) in the horizontal direction. The fixed end of the driving airbag (21) is fixedly connected to the mounting frame (24). The first end of the transmission rod (22) is drivenly connected to the driving end of the driving airbag (21), and the second end of the transmission rod (22) is hinged to the baffle. The shape of the transmission rod is configured such that the baffle can open and close the liquid inlet (111) during the inflation and deflation of the driving airbag (21) by the external air source equipment. The liquid extraction mechanism (3) has its suction end located at a low position inside the tank (1) to extract wastewater that enters the tank (1).

2. The landfill leachate drainage device according to claim 1, characterized in that, The driving end of the driving airbag (21) is arranged upward and located within the spacing range. The transmission rod (22) includes an L-shaped transmission rod segment (221), a hinged rod segment (222), and a connecting rod segment (223) connected in sequence. The free end of the L-shaped transmission rod segment (221) is in transmission contact with the driving end of the driving airbag (21). The hinged rod segment (222) is hinged to the mounting bracket (24). The connecting rod segment (223) is arranged at an angle to the hinged rod segment (222), and its free end is arranged near the liquid inlet hole (111). The baffle is hinged to the free end of the connecting rod segment (223).

3. A landfill leachate drainage device according to claim 2, characterized in that, The mounting bracket (24) includes two parallel spaced ring plates (241) and a support rod (242) that is fastened to the opposite surfaces of the two ring plates (241). The two ring plates (241) are slidably connected to the inner wall surface of the tank (1). The fixed end of the driving airbag (21) is fixedly connected to the upper plate surface of the upper ring plate (241). The hinge rod segment (222) is hinged to the upper plate surface of the upper ring plate (241).

4. A landfill leachate drainage device according to claim 3, characterized in that, The liquid inlet opening and closing mechanism (2) further includes a support plate (25) and a rotating shaft (26). The two support plates (25) are symmetrically arranged on both sides of the driving airbag (21) and are fixedly connected to the upper plate surface of the ring plate (241) located above. Rotating holes are provided on the opposite surfaces of the two support plates (25). The two ends of the rotating shaft (26) are fixedly connected to the two rotating holes respectively. The hinge rod segment (222) is rotatably connected to the rotating shaft (26).

5. A landfill leachate drainage device according to claim 3, characterized in that, The liquid inlet opening and closing mechanism (2) also includes a connecting plate (27), which is fixedly connected to the driving end of the driving airbag (21), and the free end of the L-shaped transmission rod segment (221) is in transmission contact with the connecting plate (27).

6. A landfill leachate drainage device according to claim 5, characterized in that, The liquid inlet opening and closing mechanism (2) also includes a limiting ring (28), which is sleeved around the periphery of the driving airbag (21) and fixedly connected to the upper plate surface of the ring plate (241) located above. The top end of the limiting ring (28) is arranged opposite to the lower plate surface of the connecting plate (27) to limit the lowest position of the driving airbag (21) during the deflation process.

7. A landfill leachate drainage device according to claim 2, characterized in that, The free end of the connecting rod segment (223) is rotatably connected to the upper middle position of the baffle (23) facing away from the liquid inlet hole (111).

8. A landfill leachate drainage device according to claim 1, characterized in that, There are two transmission rods (22), which are arranged in parallel and spaced apart.

9. A landfill leachate drainage device according to claim 1, characterized in that, The liquid inlet opening and closing mechanism (2) also includes a counterweight (29), which is fixedly connected to the driving end of the driving airbag (21).

10. A landfill leachate drainage device according to claim 1, characterized in that, It also includes an air pump, which is connected to the drive airbag (21) via an air supply line (20).

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