Filtering type drainage structure for airport

Abstract

The airport filtering type drainage structure comprises a drainage ditch body, a cover plate, a pressure water generating mechanism and a settling tank, the cover plate is arranged at the top end of the drainage ditch body, a plurality of filtering holes are distributed in the cover plate, the inner wall of the drainage ditch body is connected with the settling tank in the same direction as the inner wall of the drainage ditch body, and the settling tank is connected with the inner wall of the drainage ditch body through a vibration mechanism. And the bottom end of the cover plate is connected with a pressure water generating mechanism, the pressure water generating mechanism is used for receiving a water source entering from the filtering holes and treating the water source into pressure water to be sprayed into the settling tank, and self-cleaning of deposits is achieved by flushing the tank bottom of the settling tank. According to the self-cleaning drainage ditch, the effect that the drainage ditch body can be self-cleaned without manual power is achieved, labor can be greatly saved, and the safety risk of airport use caused by the fact that the drainage ditch body is blocked by deposits is avoided.

Description

Technical Field

[0001] This utility model relates to the field of airport drainage ditch construction technology, specifically to an airport filter drainage structure. Background Technology

[0002] The main functions of airport drainage ditches include the following:

[0003] (1) Preventing airport water accumulation: Drainage ditches can collect and discharge water in the airport, preventing large amounts of water accumulation in the airport due to excessive rainfall, thereby ensuring that aircraft can take off and land safely.

[0004] (2) Prevention of external flood intrusion: The drainage system can prevent large amounts of external floodwater from entering the airport flight area and protect airport facilities from flood damage.

[0005] (3) Reduce pavement defects: By timely removing moisture from the pavement or soil area, pavement defects caused by excessive moisture can be prevented, ensuring the normal operation of the airport.

[0006] Existing airport drainage ditches mostly rely on filter plates to remove impurities and prevent clogging. However, they lack the ability to filter fine gravel and mud, leading to sediment buildup over time. When the sediment buildup is significant, the ditches require extensive cleaning, consuming considerable manpower. Furthermore, existing drainage ditches lack self-cleaning capabilities, necessitating improvements to the existing technology. Utility Model Content

[0007] Based on the problems existing in the prior art, this utility model provides an airport filter drainage structure. This utility model can remove silt in the drainage ditch through self-cleaning, which greatly saves labor.

[0008] To solve the above problems, the technical solution of this utility model is as follows:

[0009] An airport filter drainage ditch includes a drainage ditch body, a cover plate, a pressurized water generating mechanism, and a settling tank. The top of the drainage ditch body is provided with a cover plate, and a plurality of filter holes are arranged on the cover plate.

[0010] The inner wall of the drainage ditch body is connected to a settling trough with the same direction as it. The settling trough is connected to the inner wall of the drainage ditch body through a vibration mechanism. The bottom end of the cover plate is connected to a pressure water generating mechanism.

[0011] The pressurized water generating mechanism is used to receive the water source entering through the filter hole and process it into pressurized water, which is then sprayed into the settling tank to achieve self-cleaning of the silt by rinsing the bottom of the settling tank.

[0012] Several overflow holes are evenly distributed on the top of the sidewall of the settling tank, and a water recycling channel is formed between the bottom of the settling tank and the bottom of the drainage ditch body.

[0013] The bottom of the drainage ditch body is also evenly distributed with water outlets, which are connected to the water storage tank through pipes pre-buried in the soil.

[0014] Preferably, the cross-section of the drainage ditch body is an inverted trapezoidal structure, and the inner sides of the two top ends of the drainage ditch body are respectively provided with slots along the length direction. The two ends of the cover plate are engaged with the slots, and a number of filter holes are arranged in a matrix on the cover plate.

[0015] Preferably, the two inner walls of the drainage ditch body are integrally formed with a support platform, the top of the two support platforms are at the same height, the cross-section of the settling trough is a rectangular structure, and the top of both ends of the settling trough are integrally formed with outwardly folded connecting plates. Several vibration mechanisms are connected between the bottom of the connecting plate and the top of the support platform.

[0016] Preferably, the vibration mechanism includes a sleeve fixedly mounted longitudinally on the upper end of the support platform, a guide rod slidably connected inside the sleeve, the top end of the guide rod being fixedly connected to the lower end of the connecting plate, and a vibration spring being provided between the connecting plate and the top end of the sleeve and outside the guide rod. The vibration spring is used to cooperate with the pressurized water generating mechanism to vibrate the settling tank.

[0017] Preferably, the pressure water generating mechanism includes a shell with an inverted quadrangular frustum structure, the top of the shell is provided with an outwardly folded connecting edge, and the bottom of the cover plate has four pre-embedded screws distributed in a rectangular shape.

[0018] The connecting edge is provided with a through hole that mates with the pre-embedded screw. The pre-embedded screw passes through the through hole and is locked with a nut. The upper port of the housing surrounds all the filter holes. The lower port of the housing is connected to a cylindrical water outlet pipe. The bottom end of the water outlet pipe is connected to a pressure water output component. The housing is provided with a buoyancy piston that mates with the water outlet pipe.

[0019] Preferably, the buoyancy piston includes a piston body, which fits with the inner wall of the outlet pipe and is used to seal the outlet pipe. A connecting rod is connected to the top of the piston body through a fixing block. The bottom end of the connecting rod is fixedly connected to the middle of the top of the fixing block. A sealing shell is fixedly connected to the top of the connecting rod.

[0020] The top of the sealed housing has four sliding rods arranged in a rectangular pattern, the sliding rods are arranged longitudinally, and the bottom of the cover plate opposite to the sliding rods is provided with sliding holes;

[0021] The slide rod is slidably connected to the slide hole, and a return spring is provided between the lower end of the slide hole and the top of the sealing housing and located on the outer sleeve of the slide rod. The piston body is made of rubber material, and the fixing block is made of buoyancy material or the fixing block is a hollow lightweight structure. The sealing housing is filled with buoyancy material.

[0022] When the fixing block is made of buoyancy material, the bottom end of the connecting rod passes through the fixing block and is simultaneously fixedly connected to the top of the fixing block and the piston body; the outer periphery of the sealing shell is also provided with multiple assist springs, and the two ends of the assist springs are respectively connected to the outer wall of the sealing shell and the inner wall of the shell.

[0023] Preferably, the pressurized water output component includes a duckbill-shaped nozzle, the top end of which is connected to the bottom end of the outlet pipe via an integrally formed transition pipe, and the bottom end of which is inclined toward the side of the water flow direction in the settling tank.

[0024] Preferably, the pressurized water output component includes a cubic pressurized water chamber, the top of which is connected to the bottom of the outlet pipe, and several spray pipes are arranged in a matrix at the bottom of the pressurized water chamber. The width of the pressurized water chamber matches the width of the bottom of the settling tank, and the length of the pressurized water chamber is the same as the length of the cover plate.

[0025] This utility model has the following beneficial effects:

[0026] This invention enables the drainage ditch to self-clean itself without the need for manual power, which can greatly save manpower and avoid the safety risks to airport use caused by the accumulation of silt in the drainage ditch. Attached Figure Description

[0027] Figure 1 A cross-sectional structural diagram of this utility model;

[0028] Figure 2 A further cross-sectional structural schematic diagram of the present invention;

[0029] Figure 3 A top view of the structure of this utility model;

[0030] Figure 4 A top view of the pressure water generating mechanism of this utility model;

[0031] Figure 5 A schematic diagram of one embodiment of the pressure water generating mechanism of this utility model for rinsing the bottom of a settling tank;

[0032] Figure 6 A schematic diagram of an embodiment of the pressure water generating mechanism of this utility model, which includes a pressure water chamber.

[0033] Figure 7A bottom view of the pressure water tank of this utility model.

[0034] Figure 8 A schematic diagram of the buoyancy piston of this utility model equipped with a booster spring.

[0035] 1: Drainage ditch body; 2: Settling tank; 3: Foundation; 4: Cover plate; 41: Filter hole; 5: Pressurized water generating mechanism; 51: Connecting edge; 52: Housing; 53: Outlet pipe; 54: Spray pipe; 55: Pressurized water tank; 56: Spray pipe; 6: Sleeve; 7: Guide rod; 8: Vibration spring; 9: Embedded screw; 10: Nut; 11: Connecting plate; 12: Pipe; 13: Overflow hole; 14: Filter screen; 15: Piston body; 16: Fixing block; 17: Connecting rod; 18: Sealing housing; 19: Sliding hole; 20: Sliding rod; 21: Return spring; 22: Slot; 23: Outlet; 24: Recycled water diversion channel; 25: Assist spring. Detailed Implementation

[0036] The following is a detailed description of the embodiments of this utility model in a step-by-step manner. This description is only a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

[0037] In the description of this utility model, it should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation structure and operation. Therefore, they should not be construed as limitations on this utility model.

[0038] Example 1

[0039] An airport-style filter drainage ditch, such as Figure 1-8 As shown, it includes a drainage ditch body 1, a cover plate 4, a pressure water generating mechanism 5, and a settling tank 2. The top of the drainage ditch body 1 is provided with a cover plate 4, and a plurality of filter holes 41 are arranged on the cover plate 4. The inner wall of the drainage ditch body 1 is connected to a settling tank 2 with the same direction.

[0040] The settling tank 2 is connected to the inner wall of the drainage ditch body 1 via a vibration mechanism. A pressurized water generating mechanism is connected to the bottom of the cover plate 4. This mechanism receives water entering through the filter holes 41 and processes it into pressurized water, which is then sprayed into the settling tank 2. This self-cleaning of the sediment is achieved by rinsing the bottom of the settling tank 2. Several overflow holes 13 are evenly distributed on the top of the side wall of the settling tank 2. A recycled water guiding channel 24 is formed between the bottom of the settling tank 2 and the bottom of the drainage ditch body 1. Water outlets 23 are also evenly distributed at the bottom of the drainage ditch body 1, and these outlets 23 are connected to a water storage tank via pipes 12 pre-buried in the soil.

[0041] In this embodiment, a pressure water generating mechanism is provided to convert the water source flowing in from the outside into pressure water that is sprayed onto the bottom of the settling tank, thereby creating an impact force that causes the sediment at the bottom of the tank to detach from the bottom and be discharged. The settling tank is specifically designed for the settling of water sources from the outside and also serves as a channel for the discharge of sediment. The vibration mechanism of the settling tank, combined with the impact of the pressure water, completes the self-cleaning of the drainage ditch. Excess water in the settling tank enters the recycled water diversion channel 24 and is stored in the storage tank for use in other water applications, such as greening water and fire-fighting water in airports.

[0042] Example 2

[0043] Based on Example 1, this example discloses: Figure 1 , 2 As shown, the cross-section of the drainage ditch body 1 is an inverted trapezoidal structure. The inner sides of the two top ends of the drainage ditch body 1 are respectively provided with slots 22 along the length direction. The two ends of the cover plate 4 are engaged with the slots 22. A number of filter holes 41 are arranged in a matrix on the cover plate 4.

[0044] like Figure 1-3 As shown, the two inner walls of the drainage ditch body 1 are integrally formed with a support platform 3, and the tops of the two support platforms 3 are at the same height. The cross-section of the settling trough 2 is rectangular. The tops of both ends of the settling trough 2 are integrally formed with outwardly folded connecting plates 11. Several vibration mechanisms are connected between the bottom of the connecting plate 11 and the top of the support platform 3.

[0045] Example 3

[0046] Based on embodiments 1 and 2, this embodiment discloses: Figure 1As shown, the vibration mechanism includes a sleeve 6 fixedly mounted longitudinally on the upper end of the support platform 3. A guide rod 7 is slidably connected inside the sleeve 6. The top end of the guide rod 7 is fixedly connected to the lower end of the connecting plate 11. A vibration spring 8 is mounted between the connecting plate 11 and the top end of the sleeve 6, and outside the guide rod 7. The vibration spring 8 is used to cooperate with the pressurized water generating mechanism to make the settling tank 2 vibrate. When the pressurized water impacts the bottom of the settling tank 2, the vibration spring 8 is subjected to the impact force from the bottom of the settling tank 2. Under the combined action of the vibration spring 8 and the impact of the pressurized water, the settling tank 2 vibrates with the extension and contraction of the vibration spring. The vibration helps to loosen the fine stone particles or soil silt on the bottom of the settling tank 2, and after loosening, it is washed away by the water flow.

[0047] Example 4

[0048] Based on embodiments 1, 2, and 3, this embodiment discloses: as follows Figure 1 , 2 As shown in Figures 3 and 8, the pressure water generating mechanism 5 includes a housing 52 with an inverted quadrangular frustum structure. The top of the housing 52 is provided with an outwardly folded connecting edge 51. The bottom of the cover plate 4 has four pre-embedded screws 9 arranged in a rectangular shape. The connecting edge 51 is provided with a through hole that cooperates with the pre-embedded screws 9. The pre-embedded screws 9 pass through the through hole and are locked by a nut 10. The upper port of the housing 52 surrounds all the filter holes 41.

[0049] The lower end of the housing 52 is connected to a cylindrical water outlet pipe 53. The bottom end of the water outlet pipe 53 is connected to a pressurized water output component. The housing 52 is equipped with a buoyancy piston that cooperates with the water outlet pipe 53. The buoyancy piston includes a piston body 15, which cooperates with the inner wall of the water outlet pipe 53 and is used to seal the water outlet pipe 53. The top end of the piston body 15 is connected to a connecting rod 17 through a fixing block 16. The bottom end of the connecting rod 17 is fixedly connected to the middle of the top end of the fixing block 16. The top end of the connecting rod 17 is fixedly connected to a sealing housing 18.

[0050] The top of the sealing housing 18 has four sliding rods 20 arranged in a rectangular pattern. Figure 2 The first two slide rods are shown. The slide rod 20 is arranged longitudinally. The bottom of the cover plate 4 opposite to the slide rod 20 is provided with a sliding hole 19. The slide rod 20 is slidably connected to the sliding hole 19. A return spring 21 is provided between the lower end of the sliding hole 19 and the top end of the sealing housing 18 and on the outer sleeve of the slide rod 20. The piston body 15 is made of rubber material.

[0051] The fixing block 16 is made of buoyancy material or is a hollow, lightweight structure. The sealed housing 18 is filled with buoyancy material (such as foam sponge). When the fixing block 16 is made of buoyancy material, the bottom end of the connecting rod 17 passes through the fixing block and is simultaneously fixedly connected to the top of the fixing block 16 and the piston body 15. The outer periphery of the sealed housing 18 is also provided with multiple assist springs 25 (such as... Figure 8 As shown, the two ends of the assist spring 25 are connected to the outer wall of the sealing housing 18 and the inner wall of the housing 52, respectively, and under the action of the return spring 21.

[0052] When the piston body 15 engages with the inner wall of the outlet pipe 53, the assist spring 25 is in a horizontal position, as shown below. Figure 8 As shown, at this time, there is no upward or downward force on the piston body. When the water in the housing 52 accumulates to the set height, the buoyancy overcomes the elastic force of the return spring 21 and the weight of the buoyancy piston, causing the piston body 15 to float upward and separate from the water outlet pipe 53. At this time, the assist spring 25 becomes tilted and provides an upward thrust to the sealing housing 18. The piston body 15 is suspended above the water outlet pipe 53 due to the buoyancy and the action of the assist spring 25. At this time, the water outlet pipe 53 continues to discharge water.

[0053] When the buoyancy force on the buoyancy piston plus the upward force of the assisting spring is less than the sum of the spring force of the return spring and the weight of the buoyancy piston, the piston body 15 re-closes the water outlet pipe 53 under the action of the return spring. During this process, the angle between the assisting spring 25 and the horizontal plane gradually decreases and eventually returns to a horizontal position.

[0054] In this embodiment, to generate a water flow with a certain pressure, a large amount of water must be rapidly sprayed out through a nozzle or spray pipe to overcome the adhesion between the sediment and the bottom of the settling tank and flush away the sediment. However, water flowing naturally from the filter holes in a common drainage tank rarely has such force; therefore, to achieve a self-cleaning effect, the water pressure must be adjusted. This invention uses a buoyancy piston to first block the outlet pipe at the bottom of the housing. At this point, water from all the filter holes on the same cover plate flows into the housing. Once the buoyancy reaches a certain level, the buoyancy piston can be opened. On the other hand, because the water outlet drains very quickly, the buoyancy piston will quickly return to its original position due to the spring force of the return spring. This results in a large amount of water not being able to continuously drain out through the water outlet. Therefore, an assist spring is provided so that the piston body can remain above the water outlet for a certain period of time, that is, the water outlet continues to open until the water in the shell is drained to a certain extent. This certain extent includes the case of emptying the shell. At this time, the buoyancy of the buoyancy piston drops to 0. At the same time, the sum of the spring force of the return spring and the weight of the buoyancy piston is greater than the upward thrust of the assist spring, and the piston body returns to its original position. Of course, it can also be a state of partially emptying the shell, that is, the sum of the buoyancy plus the upward spring force of the assist spring is less than the sum of the spring force of the return spring and the weight of the buoyancy piston. At this time, the piston body will also gradually enter the drain pipe and block the drain pipe.

[0055] Example 5

[0056] Based on embodiments 1, 2, 3, and 4, this embodiment discloses: as follows Figure 4 , 5 As shown, the pressurized water output assembly includes a duckbill-shaped nozzle 54. The top end of the nozzle 54 is connected to the bottom end of the outlet pipe 53 via an integrally formed transition pipe. The bottom end of the nozzle is inclined towards the side of the water flow direction in the settling tank. Figure 5 As shown, the water jet from the nozzle powerfully impacts the sediment at the bottom of the settling tank, thereby continuously discharging the sediment along with the water flow.

[0057] Example 6

[0058] Based on embodiments 1, 2, 3, and 4, this embodiment discloses: as follows Figure 6 , 7 As shown, the pressurized water output component includes a cubic pressurized water chamber 55. The top of the pressurized water chamber 55 is connected to the bottom of the water outlet pipe 53. Several water spray pipes 56 are arranged in a matrix at the bottom of the pressurized water chamber 55. The width of the pressurized water chamber 55 matches the width of the bottom of the settling tank 2, and the length of the pressurized water chamber 55 is the same as the length of the cover plate 4. The purpose of this arrangement is to achieve comprehensive rinsing of the tank bottom below the cover plate. Based on the existing technology, it is known that there are several cover plates, which are connected sequentially to the top of the drainage tank body. Therefore, it can be understood that this embodiment can achieve pressurized water rinsing of the entire range of the tank bottom.

[0059] Example 7

[0060] Based on the above embodiments, this embodiment discloses a method for using the aforementioned airport filter-type drainage ditch structure, such as... Figure 1-8 As shown, the process includes: external water flows into the housing 52 through the filter hole 41. As water accumulates in the housing 52, the buoyancy of the buoyancy piston gradually increases. When the buoyancy reaches a certain level, the piston body 15 disengages from the water outlet pipe, the water outlet pipe 53 opens, and the water in the housing 52 is sprayed out from the water outlet pipe 53.

[0061] During this process, the assist spring 25 provides an upward thrust to the sealed housing 18. At this time, although the buoyancy of the buoyancy piston is less than the sum of the spring force of the return spring and its own weight as the water level drops, the piston body 15 remains above the outlet pipe 53 due to the thrust of the assist spring. When the sum of the spring force of the return spring 21 and the weight of the buoyancy piston is greater than the sum of the buoyancy of the buoyancy piston and the longitudinal thrust provided by the assist spring 25, the piston body 15 begins to descend and closes the outlet pipe 53. Then, as the water flows in through the filter hole 41, it continues to accumulate water in the housing 52. The water discharged from the outlet pipe 53 may, in one case, directly flush the bottom of the settling tank 2 through the duckbill-shaped nozzle 54. The duckbill-shaped nozzle 54 under several cover plates 4 flushes the stones and silt outward along the slope of the bottom of the settling tank 2.

[0062] In another scenario, water discharged from the outlet pipe 53 enters the pressure water chamber 55 and is flushed with pressurized water through several spray pipes 56 at the bottom of the pressure water chamber 55 against the bottom of the settling tank 2 opposite the cover plate 4. The flushing water, along with stones and silt, is also discharged outward through the slope at the bottom of the settling tank 2. When the bottom of the settling tank 2 is impacted by the water flow, the impact force generated on the bottom of the tank varies due to the change in the flow velocity, resulting in different degrees of compression of the vibration spring 21. The vibration spring 21 returns to its original position due to its own elasticity, and together with the impact of the water flow, it achieves the vibration effect of the settling tank 2. As a result, the stones and silt on the bottom of the tank are loosened and discharged outward along the slope under the action of the water flow. The settling tank 2 is used to settle the stones and silt in the water. When the water level is higher than the overflow hole 13, the water flows out after being filtered by the filter screen 14 at the overflow hole and enters the space between the bottom of the settling tank 2 and the drainage ditch body 1. It then flows into the water storage tank through the recycled water diversion channel, the outlet, and the pipe.

[0063] The drainage ditch body of this invention is preferably constructed of reinforced concrete, while the settling tank is preferably constructed of stainless steel. Through these features, this invention achieves self-cleaning of the drainage ditch body without the need for manual power, significantly saving labor and avoiding the safety risks associated with airport operations caused by silt buildup in the drainage ditch body.

Claims

1. An airport filter drain structure characterized by: The gutter body is provided with a cover plate at the top end, and a plurality of filter holes are arranged on the cover plate. The inner wall of the gutter body is connected with a sedimentation tank with the same direction, and the sedimentation tank is connected with the inner wall of the gutter body through a vibration mechanism. The pressure water generating mechanism is used to receive the water source entering through the filter hole and process it into pressure water to be sprayed into the sedimentation tank, so as to realize self-cleaning of the silt through flushing of the bottom of the sedimentation tank. A plurality of overflow holes are uniformly distributed on the top of the side wall of the sedimentation tank, and a water recycling guide channel is formed between the bottom of the sedimentation tank and the bottom of the gutter body. The bottom of the gutter body is also uniformly distributed with a water outlet, and the water outlet is connected with a water storage tank through a pipeline embedded in the soil.

2. A filter drain for an airfield as claimed in claim 1, characterised in that: The cross section of the gutter body is an inverted trapezoidal structure, and the two top ends of the gutter body are respectively provided with a clamping groove along the length direction.

3. A filter drain for an airfield as claimed in claim 1, characterised in that: The two inner walls of the gutter body are integrally formed with a bearing platform, and the top ends of the two bearing platforms have the same height.

4. A filter drain for an airfield as claimed in claim 3, characterised in that: The cross section of the sedimentation tank is a rectangular structure, and the top of the two ends of the sedimentation tank is integrally formed with an outwardly folded connecting plate.

5. A filter drain for an airfield as claimed in claim 4, characterised in that: The vibration mechanism includes a sleeve fixed on the upper end of the bearing platform along the longitudinal direction, and a guide rod is slidably connected in the sleeve. The top end of the guide rod is fixedly connected with the lower end of the connecting plate, and a vibration spring is arranged between the connecting plate and the top end of the sleeve and outside the guide rod.

6. A filter drain for an airfield as claimed in claim 5, characterised in that: The vibration spring is used to vibrate the sedimentation tank in cooperation with the pressure water generating mechanism. The pressure water generating mechanism includes a shell with an inverted quadrangular frustum structure, and the top end of the shell is provided with an outwardly folded connecting edge. The connecting edge is provided with a through hole matched with the embedded screw rod, the embedded screw rod passes through the through hole and is locked by a nut, and the upper end of the shell surrounds all the filter holes. The lower end of the shell is connected with a cylindrical water outlet pipe, the bottom end of the water outlet pipe is connected with a pressure water output assembly, and the shell is provided with a buoyancy piston matched with the water outlet pipe. The buoyancy piston includes a piston body matched with the inner wall of the water outlet pipe and used to close the water outlet pipe. The top end of the piston body is connected with a connecting rod through a fixed block, the bottom end of the connecting rod is fixedly connected with the middle part of the top end of the fixed block, and the top end of the connecting rod is fixedly connected with a sealing shell. The top end of the sealing shell is provided with four slide rods arranged in a matrix, and the bottom of the cover plate opposite to the slide rods is provided with slide holes. The slide rods are slidably connected with the slide holes, and a return spring is arranged between the lower end of the slide hole and the top end of the sealing shell and outside the slide rod. The piston body is made of rubber material, the fixed block is made of buoyancy material or is a hollow lightweight structure, and the sealing shell is filled with buoyancy material. The fixed block is made of buoyancy material, the bottom end of the connecting rod penetrates through the fixed block and is fixedly connected with the fixed block and the top of the piston body; the outer periphery of the sealing shell is further provided with a plurality of booster springs, and the two ends of the booster spring are respectively connected with the outer wall and the inner wall of the sealing shell.

7. A filter drain for an airfield as claimed in claim 6, characterised in that: The pressure water output assembly comprises a duckbill-shaped spray pipe, the top end of the spray pipe is connected with the bottom end of the water outlet pipe through an integrally-formed transition pipe body, and the bottom end of the spray pipe is inclined to one side of the water flow direction in the sedimentation tank.

8. A filter drain for an airfield as claimed in claim 7, characterised in that: The pressure water output assembly comprises a cubic pressure water tank, the top end of the pressure water tank is connected with the bottom end of the water outlet pipe, and the bottom end of the pressure water tank is arranged with a plurality of water spray pipes in a matrix, the width of the pressure water tank is matched with the width of the bottom of the sedimentation tank, and the length of the pressure water tank is the same as the length of the cover plate.

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