Drainage device with controllable water storage depth in farmland

Abstract

The application discloses a drainage device capable of controlling the water storage depth of a farmland, which comprises a first drainage pipe formed with a first drainage port, a fixed pipe body in communication with the first drainage pipe and formed with a connecting port, and a lifting pipe body extended into the fixed pipe body from the connecting port and in communication with the fixed pipe body, wherein the lifting pipe body is formed with a first water inlet, and is configured to be lifted relative to the fixed pipe body in response to an external force, so that the first water inlet is moved between a first height position and a second height position, the second height position is higher than the first height position, and the first height position is higher than the height position of the first drainage port. The application can control the water storage depth by adjusting the height of the lifting pipe body, and the drainage device has a simple structure, only needs the cooperation between the lifting pipe body and the fixed pipe body, and does not need a complex gate mechanism, so that the manufacturing cost is reduced.

Description

Technical Field

[0001] This application relates to the field of agricultural irrigation equipment technology, specifically to a drainage device that controls the water storage depth in farmland. Background Technology

[0002] Farmland drainage systems are one of the core facilities in agricultural water conservancy projects. They are mainly used to regulate the water balance in the fields, prevent waterlogging disasters, lower the groundwater level to prevent soil salinization, and improve soil permeability to promote crop growth. Existing drainage systems mostly rely on manual gates. Operators then observe the water level to determine whether the water storage has reached the appropriate level, and then manually close the gates. This operation is time-consuming and labor-intensive, and the control of the water storage level is not precise enough. Utility Model Content

[0003] This application aims to address one of the technical problems in related technologies to a certain extent. To this end, this application provides a drainage device for controlling the water depth in farmland.

[0004] To achieve the above objectives, this application adopts the following technical solution: a drainage device for controlling the water storage depth in farmland, the drainage device comprising:

[0005] The first drainage pipe has a first drainage outlet;

[0006] A fixed pipe body, which is connected to the first drain pipe and forms a connection port; and,

[0007] A lifting pipe body extends into the fixed pipe body from the connection port and the two are connected, and the lifting pipe body forms a first water inlet;

[0008] The lifting pipe is configured to rise and fall relative to the fixed pipe in response to an external force, so that the first water inlet moves between a first height position and a second height position, wherein the second height position is higher than the first height position and the first height position is higher than the height position of the first drain outlet.

[0009] The application of this application has the following beneficial effects: The drainage device can control the water storage depth by adjusting the height of the lifting pipe. Specifically, according to the required water storage depth, the lifting pipe is adjusted so that the height of the first inlet is at the desired position. Then, the drainage is automatically carried out using the relative height difference between the first inlet and the first outlet until the water level is level with the height of the first inlet, at which point the drainage automatically stops. Furthermore, the drainage device has a simple structure, requiring only the lifting pipe to move relative to the fixed pipe, eliminating the need for a complex gate mechanism and reducing manufacturing costs.

[0010] Optionally, the drainage device further includes a drive assembly connected to the lifting pipe body and used to drive the lifting pipe body to move up and down. The drive assembly can drive the lifting pipe body to slide and move relative to the fixed pipe body, eliminating the need for manual operation. Furthermore, the drive assembly provides more precise control over the lifting stroke of the lifting pipe body.

[0011] Optionally, the driving component includes:

[0012] A connecting frame is fixedly installed on the lifting pipe body;

[0013] A transmission lead screw, which is threadedly connected to the connecting frame;

[0014] A drive motor, the output end of which is fixedly connected to the transmission lead screw and used to drive the transmission lead screw to rotate; and...

[0015] A limiting structure is installed between the lifting tube and the fixed tube to restrict the rotation of the lifting tube relative to the fixed tube. Using a lead screw as the power transmission component achieves high transmission efficiency. Furthermore, since the lead screw only rotates and does not lift, there is no axial relative movement between the lead screw and the drive motor. This prevents dirt, sand, and other contaminants from being introduced into the drive motor, ensuring a longer service life for the drive assembly.

[0016] Optionally, the limiting structure includes a limiting groove and a limiting rod that slide together, one of which is disposed in the lifting tube body and the other is disposed in the fixed tube body.

[0017] Optionally, the drainage device further includes a slip ring, which is sleeved on the outside of the lifting pipe body and fixedly installed on the lifting pipe body. A limiting groove is disposed on the slip ring, and a limiting rod is fixedly disposed on the inner wall of the fixed pipe body. The outer ring surface of the slip ring slides in conjunction with the inner wall of the fixed pipe body. By fixing a slip ring to the outside of the lifting pipe body, the contact area between the lifting pipe body and the fixed pipe body can be reduced, thus reducing frictional resistance during sliding. Simultaneously, the cooperation between the slip ring and the limiting structure can improve the sliding stability of the lifting pipe body relative to the fixed pipe body.

[0018] Optionally, the drainage device further includes a control unit and a detection element. Both the detection element and the drive assembly are electrically connected to the control unit. The control unit acquires farmland water level data through the detection element and controls the drive assembly to operate based on this data. By setting up the control unit and detection element, automated control of the drive assembly can be achieved, adapting to application scenarios such as large-area farmland and remote control.

[0019] Optionally, the drainage device further includes a second drainage pipe and a water-blocking structure. The second drainage pipe has a second water inlet, and the water-blocking structure is disposed at the second water inlet and is used to prevent water from entering the second drainage pipe from the second water inlet.

[0020] The second drain pipe is connected to the first drain pipe, and the height of the second inlet is located between the height of the first drain outlet and the first height position;

[0021] Alternatively, the second drain pipe may have a second drain outlet, and the height of the second drain outlet may be lower than the height of the second inlet. The second drain pipe can be used to quickly drain water from farmland. Furthermore, when needed, the second drain pipe can be used in conjunction with the first drain pipe to accelerate the drainage process.

[0022] Optionally, the water-blocking structure is a water-blocking plate that can be opened and closed relative to the second water inlet;

[0023] Alternatively, the water-blocking structure may be a water-blocking pipe, which is detachably inserted into the second water inlet, and the height of the upper end face of the water-blocking pipe is higher than the second height position.

[0024] Optionally, the drainage device further includes a sealing ring and a locking cap. The sealing ring is fitted over the outside of the lifting pipe body and includes a main body portion abutting against the end of the fixed pipe body and a flange portion extending into the connection port. The flange portion is sandwiched between the inner wall of the fixed pipe body and the outer wall of the lifting pipe body. The locking cap is threaded to the end of the fixed pipe body, and the inner ring of the locking cap forms a pressure-applying portion. The pressure-applying portion presses the sealing ring against the end of the fixed pipe body by pressing against the main body portion. By providing a sealing ring, the sealing performance between the lifting pipe body and the fixed pipe body can be improved, preventing water from seeping into the fixed pipe body and being discharged. In addition, by providing a locking cap, the sealing ring can be pressed tightly against the fixed pipe body, preventing the sealing ring from falling off and improving the sealing performance.

[0025] Optionally, the drainage device further includes a fixing base and a filter screen. The fixing base forms an open mounting cavity, and the filter screen is disposed at the open cavity. The first drainage pipe, the fixed pipe body, and the lifting pipe body are all installed on the fixing base and located within the mounting cavity, with the first drainage outlet extending outside the mounting cavity. The fixing base allows the first drainage pipe, lifting pipe body, and fixed pipe body to be pre-installed at the factory, requiring only one-piece installation by the operator in the field, reducing assembly work for the user. The filter screen blocks weeds, clods of soil, and other foreign objects, preventing blockage of the first inlet.

[0026] These features and advantages of this application will be disclosed in detail in the following specific embodiments and accompanying drawings. The best embodiments or means of this application will be shown in detail in conjunction with the accompanying drawings, but are not intended to limit the technical solutions of this application. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0027] The following description, in conjunction with the accompanying drawings, further illustrates this application:

[0028] Figure 1 A schematic diagram of a drainage device for controlling the water storage depth in farmland provided in Embodiment 1 of this application;

[0029] Figure 2 This is a schematic diagram of the drainage device in Example 1 without the drive motor;

[0030] Figure 3 This is a schematic diagram of the drainage device in Embodiment 1 from another perspective, excluding the drive motor;

[0031] Figure 4 This is a schematic diagram of the drainage device in Example 1 with the fixing base and filter screen further removed;

[0032] Figure 5 This is an exploded view of the drainage device in Example 1;

[0033] Figure 6 This is a side view of the lifting tube body relative to the fixed tube body at the first height position in Embodiment 1;

[0034] Figure 7 This is a cross-sectional view of the lifting tube body relative to the fixed tube body at the first height position in Embodiment 1;

[0035] Figure 8 This is a side view of the lifting tube body in Embodiment 1 when it is at the second height position relative to the fixed tube body;

[0036] Figure 9 This is a cross-sectional view of the lifting tube body in Embodiment 1 when it is at the second height position relative to the fixed tube body;

[0037] Figure 10 A schematic diagram of a drainage device for controlling the water storage depth in farmland provided in Embodiment 2 of this application;

[0038] Figure 11 This is a schematic diagram of the drainage device in Example 2 without the fixed base;

[0039] Figure 12 This is an exploded view of the drainage device in Example 2.

[0040] Among them, 1. First drain pipe; 10. First drain outlet; 2. Fixed pipe body; 20. Connecting port; 21. Limiting rod; 3. Lifting pipe body; 30. First water inlet; 31. Slip ring; 310. Limiting groove; 4. Drive assembly; 40. Connecting frame; 41. Drive motor; 410. Solar panel; 5. Second drain pipe; 50. Second water inlet; 51. Second drain outlet; 6. Water baffle; 7. Sealing ring; 70. Main body; 71. Flange; 8. Locking cap; 9. Fixed seat; 90. Mounting cavity; 91. Filter screen. Detailed Implementation

[0041] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this application and should not be construed as limiting it.

[0042] The terms "an embodiment," "example," or "example" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this application. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0043] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Example 1: This example provides a drainage device for controlling the water storage depth in farmland, such as... Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 8As shown, the drainage device includes a first drain pipe 1, a fixed pipe body 2, and a lifting pipe body 3. The first drain pipe 1 has a first drain outlet 10. The fixed pipe body 2 is connected to the first drain pipe 1 and has a connection port 20. The lifting pipe body 3 extends into the fixed pipe body 2 through the connection port 20 and the two are connected. The lifting pipe body 3 has a first water inlet 30. In this embodiment, the lifting pipe body 3 is configured to rise and fall relative to the fixed pipe body 2 in response to an external force, so that the first water inlet 30 can move between a first height position and a second height position. The second height position is higher than the first height position, and the first height position is higher than the height of the first drain outlet 10. This ensures that water flowing into the lifting pipe body 3 can be discharged from the first drain pipe 1 at any height position.

[0046] The drainage device provided in this embodiment controls the water storage depth by adjusting the height of the lifting pipe 3. Specifically, the lifting pipe 3 is adjusted to the required height of the first inlet 30 according to the desired water storage depth. Then, the drainage is automatically carried out using the relative height difference between the first inlet 30 and the first outlet 10 until the water surface is level with the height of the first inlet 30, at which point the drainage automatically stops. In addition, the drainage device has a simple structure, requiring only the lifting pipe 3 to move relative to the fixed pipe 2, eliminating the need for a complex gate mechanism and reducing manufacturing costs.

[0047] Furthermore, the drainage device provided in this embodiment also includes a drive assembly 4, which is connected to the lifting pipe body 3 and used to drive the lifting pipe body 3 to rise and fall. The lifting pipe body 3 can be driven to slide and rise relative to the fixed pipe body 2 by the drive assembly 4, eliminating the need for manual operation. At the same time, the drive assembly 4 provides more precise control over the rising and falling stroke of the lifting pipe body 3. Of course, in other optional embodiments, the lifting pipe body 3 can also be manually operated to rise and fall relative to the fixed pipe body 2.

[0048] The drive assembly 4 in this embodiment includes a drive motor 41, a transmission screw (not shown in the figure), a connecting frame 40, and a limiting structure. The connecting frame 40 is fixedly mounted on the lifting tube body 3, the transmission screw is threadedly connected to the connecting frame 40, the output end of the drive motor 41 is fixedly connected to the transmission screw and used to drive the transmission screw to rotate, and the limiting structure is disposed between the lifting tube body 3 and the fixed tube body 2 and used to restrict the rotation of the lifting tube body 3 relative to the fixed tube body 2. Using a screw as the power transmission component achieves high transmission efficiency. Simultaneously, since the transmission screw only needs to rotate and not lift, there is no axial relative movement between the transmission screw and the drive motor 41, thus preventing the introduction of dirt, dust, and other substances adhering to the transmission screw into the drive motor 41, ensuring a longer service life for the drive assembly 4. It is easily understood that in other optional embodiments, a linear actuator (such as an electric actuator) can also be used as the drive assembly 4. The output end of the linear actuator can be fixedly connected to the lifting tube body 3, and the lifting tube body 3 can be directly driven to lift relative to the fixed tube body 2.

[0049] like Figure 5 , Figure 7 and Figure 9 As shown, the limiting structure in this embodiment includes a limiting groove 310 and a limiting rod 21 that slide against each other. Specifically, the drainage device provided in this embodiment also includes a slip ring 31, which is sleeved on the outside of the lifting pipe body 3 and fixedly installed on the lifting pipe body 3. The limiting groove 310 is provided on the slip ring 31, and the limiting rod 21 is fixedly provided on the inner wall of the fixed pipe body 2. The cooperation between the limiting groove 310 and the limiting rod 21 can limit the circumferential rotation of the lifting pipe body 3 relative to the fixed pipe body 2, ensuring the stability of the lifting pipe body 3 during the lifting process. At the same time, the outer ring surface of the slip ring 31 in this embodiment slides against the inner wall of the fixed pipe body 2. That is, by setting the slip ring 31, a gap can be formed between the inner wall surface of the fixed pipe body 2 and the outer wall surface of the lifting pipe body 3, which can reduce the contact area between the lifting pipe body 3 and the fixed pipe body 2, reduce the frictional resistance during the sliding process, and facilitate the lifting and sliding of the lifting pipe body 3.

[0050] In other alternative embodiments, the limiting rod 21 can be fixedly installed on the outer wall of the lifting tube 3, and the limiting groove 310 can be installed on the fixed tube 2.

[0051] like Figure 5 As shown, in this embodiment, the connecting frame 40, slip ring 31 and limiting rod 21 are all installed with screws. Specifically, the connecting frame 40 is fixedly installed to the upper end of the lifting tube 3 with screws, the slip ring 31 is fixedly installed to the lower end of the lifting tube 3 with screws, and the limiting rod 21 is fixedly installed to the outer wall of the fixed tube 2 with screws.

[0052] Furthermore, the drainage device provided in this embodiment also includes a control unit and a detection element. Both the detection element and the drive assembly 4 are electrically connected to the control unit. The control unit acquires farmland water level data through the detection element and controls the drive assembly 4 to operate based on this data. By setting up the control unit and detection element, automated control of the drive assembly 4 can be achieved, adapting to application scenarios such as large-area farmland and remote control. Specifically, the detection element can be a water level gauge or an image acquisition instrument (e.g., a water level camera with a water gauge). The detection element can determine the real-time farmland water level data. The control unit can determine whether the current farmland water level meets the requirements based on this data. If the current farmland water level exceeds the requirement, the control unit can control the drive assembly 4 to operate, driving the lifting pipe 3 to descend relative to the fixed pipe 2 to a certain height until the farmland water is discharged to the required height.

[0053] In addition, in this embodiment, a solar panel 410 is provided on the housing of the drive motor 41, which can provide power to the drive motor 41, control unit and detection elements, etc., thereby extending the online working time of the drive motor 41.

[0054] In some application scenarios, it is necessary to drain all the water stored in farmland. Since the drainage device provided in this embodiment requires a fixed pipe body 2 to allow the lifting pipe body 3 to have a certain lifting stroke, the height of the first inlet 30 must be higher than the farmland ground level. To ensure complete drainage of the farmland water, the drainage device provided in this embodiment also includes a second drainage pipe 5 and a water-blocking structure. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, in this embodiment, the second drain pipe 5 has a second inlet 50, and a water-blocking structure is provided at the second inlet 50 to prevent stored water from entering the second drain pipe 5 through the second inlet 50. The second drain pipe 5 also has a second outlet 51, and the height of the second outlet 51 is lower than the height of the second inlet 50. In this embodiment, the second drain pipe 5 can be used to drain all the stored water from the farmland.

[0055] In this embodiment, the water-blocking structure is a water-blocking pipe 6, which is detachably inserted into the second water inlet 50, and the upper end face of the water-blocking pipe 6 is higher than the second height position. This arrangement makes it convenient for the operator to directly hold the upper end of the water-blocking pipe 6 to insert and remove it. Of course, in an optional embodiment, the water-blocking structure can also be a water-blocking plate, which is closable at the second water inlet 50, and the operator can also reach into the water storage to a certain depth to retrieve the water-blocking plate.

[0056] The second drainage pipe 5 can be used to quickly drain the water stored in the farmland. In addition, when needed, the second drainage pipe 5 can be used in conjunction with the first drainage pipe 1 to speed up the drainage process.

[0057] In addition, combined Figure 5 and Figure 7 As shown, the drainage device provided in this embodiment also includes a sealing ring 7 disposed at the connection port 20, which is sleeved on the outside of the lifting pipe body 3. The sealing ring 7 includes a main body portion 70 abutting against the end of the fixed pipe body 2 and a flange portion 71 extending into the connection port 20. The flange portion 71 is sandwiched between the inner wall of the fixed pipe body 2 and the outer wall of the lifting pipe body 3. By providing the sealing ring 7, the sealing performance between the lifting pipe body 3 and the fixed pipe body 2 can be improved, preventing water from seeping into the fixed pipe body 2 from between the two and being discharged.

[0058] Furthermore, the drainage device provided in this embodiment also includes a locking cap 8 sleeved on the outside of the lifting pipe body 3. The locking cap 8 is threadedly connected to the end of the fixed pipe body 2. The inner ring of the locking cap 8 forms a pressure-applying part, which presses the sealing ring 7 against the end of the fixed pipe body 2 by pressing against the main body part 70. By providing the locking cap 8, the sealing ring 7 can be pressed tightly against the fixed pipe body 2, preventing the sealing ring 7 from falling off and improving the sealing performance.

[0059] like Figure 2 and Figure 3 As shown, the drainage device provided in this embodiment also includes a fixing base 9 and a filter screen 91. The fixing base 9 forms an installation cavity 90 with an opening, and the filter screen 91 is disposed at the opening. The first drainage pipe 1, the second drainage pipe 5, the fixed pipe body 2, and the lifting pipe body 3 are all installed in the fixing base 9 and located in the installation cavity 90, and the first drainage outlet 10 and the second drainage outlet 51 both extend out of the installation cavity 90. By setting the fixing base 9, the first drainage pipe 1, the lifting pipe body 3, and the fixed pipe body 2 can be pre-installed at the factory. Operators only need to fix and install the entire drainage device as a whole in the field, reducing the assembly operation for users. By setting the filter screen 91, weeds or soil clods can be blocked to prevent the first water inlet 30 from being blocked. The fixing base 9 is made of cement.

[0060] Example 2: This example also provides a drainage device for controlling the water storage depth in farmland, such as... Figure 10 , Figure 11 and Figure 12 As shown, the difference between this embodiment and the first embodiment described above is that the second drain pipe 5 in this embodiment is connected to the first drain pipe 1, and the height of the second inlet 50 is located between the height of the first drain outlet 10 and the first height position. That is, the second drain pipe 5 in this embodiment does not have a separate drain outlet, but shares a first drain outlet 10 with the first drain pipe 1.

[0061] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Those skilled in the art should understand that this application includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this application will be included within the scope of the claims.

Claims

1. A drainage device for controlling the water storage depth in farmland, characterized in that, The drainage device includes: The first drain pipe (1) has a first drain outlet (10); A fixed pipe body (2) is connected to the first drain pipe (1) and has a connection port (20); and, The lifting pipe (3) extends into the fixed pipe (2) through the connection port (20) and the two are connected. The lifting pipe (3) forms a first water inlet (30). The lifting pipe (3) is configured to rise and fall relative to the fixed pipe (2) in response to an external force, so that the first water inlet (30) moves between a first height position and a second height position, the second height position being higher than the first height position, and the first height position being higher than the height position of the first drain outlet (10).

2. The drainage device as described in claim 1, characterized in that, The drainage device also includes a drive assembly (4), which is connected to the lifting pipe body (3) and is used to drive the lifting pipe body (3) to rise and fall.

3. The drainage device as described in claim 2, characterized in that, The driving component (4) includes: A connecting frame (40) is fixedly installed on the lifting tube body (3); A transmission lead screw, which is threadedly connected to the connecting frame (40); A drive motor (41) is fixedly connected to the transmission lead screw at its output end and is used to drive the transmission lead screw to rotate; and, A limiting structure is provided between the lifting tube (3) and the fixed tube (2) and is used to restrict the rotation of the lifting tube (3) relative to the fixed tube (2).

4. The drainage device as described in claim 3, characterized in that, The limiting structure includes a limiting groove (310) and a limiting rod (21) that slide together. One of the limiting groove (310) and the limiting rod (21) is provided in the lifting tube body (3), and the other is provided in the fixed tube body (2).

5. The drainage device as described in claim 4, characterized in that, The drainage device also includes a slip ring (31), which is sleeved on the outside of the lifting pipe body (3) and fixedly installed on the lifting pipe body (3). The limiting groove (310) is provided on the slip ring (31), and the limiting rod (21) is fixedly provided on the inner wall of the fixed pipe body (2). The outer ring surface of the slip ring (31) slides in cooperation with the inner wall of the fixed pipe body (2).

6. The drainage device as described in claim 2, characterized in that, The drainage device also includes a control unit and a detection element. The detection element and the drive assembly (4) are both electrically connected to the control unit. The control unit obtains farmland water storage height data through the detection element and controls the drive assembly (4) to work according to the farmland water storage height data.

7. The drainage device as described in claim 1, characterized in that, The drainage device further includes a second drainage pipe (5) and a water-blocking structure. The second drainage pipe (5) has a second water inlet (50). The water-blocking structure is located at the second water inlet (50) and is used to prevent water from entering the second drainage pipe (5) from the second water inlet (50). The second drain pipe (5) is connected to the first drain pipe (1), and the height position of the second inlet (50) is between the height position of the first drain outlet (10) and the first height position; Alternatively, the second drain pipe (5) may have a second drain outlet (51), and the height of the second drain outlet (51) may be lower than the height of the second inlet (50).

8. The drainage device as described in claim 7, characterized in that, The water-blocking structure is a water-blocking plate that can be opened and closed relative to the second water inlet (50); Alternatively, the water-blocking structure is a water-blocking pipe (6), which is detachably inserted into the second water inlet (50), and the height of the upper end face of the water-blocking pipe (6) is higher than the second height position.

9. The drainage device as described in any one of claims 1 to 8, characterized in that, The drainage device also includes a sealing ring (7) and a locking cap (8). The sealing ring (7) is sleeved on the outside of the lifting pipe body (3). The sealing ring (7) includes a main body (70) that abuts against the end of the fixed pipe body (2) and a flange (71) that extends into the connection port (20). The flange (71) is sandwiched between the inner wall of the fixed pipe body (2) and the outer wall of the lifting pipe body (3). The locking cap (8) is threaded to the end of the fixed tube body (2). The inner ring of the locking cap (8) has a pressure part. The pressure part presses the sealing ring (7) against the end of the fixed tube body (2) by pressing against the main body (70).

10. The drainage device according to any one of claims 1 to 8, characterized in that, The drainage device also includes a fixing seat (9) and a filter screen (91), the fixing seat (9) forming an installation cavity (90) with an opening, and the filter screen (91) being disposed at the opening; The first drain pipe (1), the fixed pipe body (2) and the lifting pipe body (3) are all installed on the fixed base (9) and located in the mounting cavity (90), and the first drain outlet (10) extends out of the mounting cavity (90).

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