Roof gutter structure

Abstract

The application discloses a roof downspout structure and relates to the technical field of anti-seepage equipment. The roof downspout structure comprises a downspout, a water absorption part, an extrusion plate, a water collecting box and a control assembly. The extrusion plate is arranged on the top of the water absorption part. The water collecting box is slid up and down in the downspout hole. Before the water collecting box is filled with water flow, the control assembly controls the water collecting box to be close to the downspout hole. After the water collecting box is filled with water flow, the control assembly controls the water collecting box to slide downward. When the water collecting box slides downward, a power assembly drives the extrusion plate to extrude the water absorption part. A sealing plate is arranged on the bottom of the water collecting cavity and is used for opening or closing the cavity opening. After the extrusion plate extrudes the water absorption part, a driving assembly drives the sealing plate to open the cavity opening on the bottom of the water collecting cavity. After the water flow in the water collecting box is discharged, the power assembly drives the water collecting box to move upward. When the water collecting box moves upward, the driving assembly drives the sealing plate to close the cavity opening on the bottom of the water collecting cavity. The roof downspout structure can discharge the accumulated water on the waterproof layer and reduce the possibility of leakage of the waterproof layer.

Description

Technical Field

[0001] This application relates to the technical field of waterproofing equipment, and in particular to a roof drain structure. Background Technology

[0002] With the continuous development of civil buildings, many buildings have begun to adopt inverted roof structures, which is a design in which the insulation layer is placed on top of the waterproof layer. When laying an inverted roof structure, a rigid protective layer is usually set on the top layer, followed by the insulation layer, waterproof layer, and other structures below the rigid protective layer.

[0003] The structure above the waterproof layer lacks waterproofing performance, and gaps can easily appear between it and the drain outlet, allowing rainwater to seep in. When rainwater penetrates, water will accumulate on the waterproof layer. When water accumulates on the waterproof layer, it can generally only seep slowly through the gaps in the insulation layer. Therefore, during the construction of inverted roof drain outlets, various sealing materials are typically used to seal the external environment connecting to the drain outlet, preventing rainwater from seeping into the insulation layer from the outer perimeter of the drain outlet.

[0004] However, sealing with sealant is highly dependent on the construction process. If there are errors or non-standard practices during construction, or other factors such as thermal expansion and contraction, gaps can easily reappear at the seal, leading to leaks. When leaks occur, water accumulates on the waterproof layer, and if it is not drained promptly, rainwater may continue to seep through. Summary of the Invention

[0005] In order to drain water in the event of water accumulation on the waterproof layer and reduce the possibility of leakage, this application provides a roof drain structure.

[0006] This application provides a roof drain structure, which adopts the following technical solution:

[0007] A roof drain structure, including

[0008] A downpipe is installed on the roof. The downpipe has a downhole, a mounting groove is formed around the downhole in the circumferential direction, and an inlet hole is formed in the downpipe that communicates with the mounting groove.

[0009] The downpipe has a water outlet hole, and one side of the water outlet hole is connected to the bottom of the mounting groove and the downpipe hole.

[0010] A water-absorbing part is installed in the mounting groove, and the water-absorbing part surrounds the drain hole;

[0011] The extrusion plate slides up and down in the mounting groove, and the extrusion plate is located at the top of the water absorption part;

[0012] A water collection box slides up and down within the drain hole, and the water collection box forms a water collection cavity;

[0013] A control component is installed on the downpipe. Before the water collection box is filled with water, the control component controls the water collection box to be positioned close to the opening of the downpipe. After the water collection box is filled with water, the control component controls the water collection box to slide downward.

[0014] A power assembly is installed in the downpipe. When the water collection box slides downward, the power assembly drives the extrusion plate to extrude the water absorption part.

[0015] A sealing plate slides at the bottom of the water collection box, and the sealing plate can open or close the bottom opening of the water collection chamber;

[0016] A drive assembly is provided in the downpipe. After the squeezing plate squeezes the water-absorbing part, the drive assembly drives the sealing plate to open the bottom cavity of the water collection chamber.

[0017] After the water in the water collection box is discharged, the power component drives the water collection box to move upward.

[0018] When the water collection box moves upward, the driving component drives the sealing plate to seal the bottom opening of the water collection cavity.

[0019] By adopting the above technical solution, when rain causes water to accumulate on the waterproof layer, the absorbent part continuously absorbs water, causing the accumulated water to continuously converge towards the inlet pipe. Simultaneously, the water collection box collects rainwater entering the drain hole from the orifice. Until the control component controls the water collection box to enter a downward movement state, at which point the power component drives the extrusion strip downwards to press the absorbent part, causing the absorbed water to flow through the outlet hole into the drain hole. As the water collection box moves downwards, causing the extrusion plate to squeeze water out of the absorbent part, the drive component drives the sealing plate to open the bottom opening of the water collection chamber. At this point, the water in the water collection chamber is quickly discharged. Then, the power component drives the extrusion plate and the water collection box to move back to their original position. When the water collection box moves back to its original position, the drive component drives the sealing plate to seal the bottom opening of the water collection chamber, causing the water collection box to re-enter the rainwater collection state. The entire process is simple and can drain accumulated water from the waterproof layer, reducing the possibility of leakage.

[0020] Optionally, the control component includes a control block and a control spring;

[0021] The downpipe has a control groove that communicates with the downhole, and the control block slides within the control groove.

[0022] The control spring is installed in the control groove, and the control spring drives the control spring to protrude into the drain hole;

[0023] The control block is tilted to form a control surface, and the bottom of the water collection box slides on the control surface.

[0024] By adopting the above technical solution, the control spring drives the control bar to protrude into the drain hole, so that the weight of the water collection box is insufficient to push the control block to slide to the end and contact the side of the water collection box. The water collection box can maintain the state of being adjacent to the drain hole opening, which is beneficial to maintaining the state of the water absorption part.

[0025] Optionally, the power assembly includes a power bar and a power spring;

[0026] The power strip has multiple sections and slides up and down on the downpipe. The two ends of the power strip are respectively connected to the inner wall of the extrusion plate and the outer wall of the water collection box.

[0027] The power spring is installed on the downpipe, and the power spring drives the power bar to move upward.

[0028] By adopting the above technical solution, the power bar links the extrusion plate and the water collection box; the power spring drives the power bar to move upward, causing the extrusion plate and the water collection box to move back to their original positions.

[0029] Optionally, the driving component includes an upper driving block, a lower driving block, a first push bar, and a second push bar;

[0030] The first push bar and the second push bar are respectively disposed on opposite side walls of the sealing plate;

[0031] The upper driving block and the lower driving block are disposed opposite to each other on the wall of the drain hole, and the upper driving block and the lower driving block are offset vertically.

[0032] The upper driving block is inclined to form an upper driving surface for the first pushing block to slide. When the first pushing block slides on the upper driving surface, the upper driving block drives the sealing plate to block the bottom cavity of the water collection chamber.

[0033] The lower drive block is inclined to form a lower drive surface for the second push block to slide on. When the second push block slides on the lower drive surface, the lower drive block drives the sealing plate to open the bottom cavity of the water collection chamber.

[0034] By adopting the above technical solution, when the second push bar slides on the lower driving surface, the sealing plate opens the bottom cavity of the water collection chamber; when the first push bar slides on the upper driving surface, the sealing plate seals the bottom cavity of the water collection chamber.

[0035] Optionally, the water collection box is formed with a sliding hole extending horizontally and communicating with the drain hole, and the sealing plate slides in the sliding hole;

[0036] The water collection box is provided with a sealing ring located on the top wall of the sliding hole, and the sealing ring is in sliding contact with the sealing plate.

[0037] By adopting the above technical solution, the sealing ring seals the gap between the sealing plate and the top wall of the sliding hole, reducing the possibility of rainwater leakage.

[0038] Optionally, the bottom wall of the water inlet hole and the top of the waterproof layer are on the same plane.

[0039] By adopting the above technical solution, rainwater can easily enter the inlet hole.

[0040] Optionally, a baffle plate is formed circumferentially on the outer periphery of the downpipe, and the downpipe is formed with a water inlet for the baffle plate to intercept water flow and introduce it into the downhole.

[0041] By adopting the above technical solution, rainwater is intercepted by the water-blocking plate, reducing the amount of water accumulating on the waterproof layer.

[0042] Optionally, the baffle plate is formed with a water delivery surface that guides the water flow toward the water delivery hole.

[0043] By adopting the above technical solution, the intercepted rainwater is guided and transmitted to the water inlet through the water conveyance surface.

[0044] Optionally, the downpipe is inclined and equipped with a water guide plate that guides the water flow toward the water collection box. There are multiple water guide plates, which are arranged circumferentially on the side wall of the downpipe.

[0045] By adopting the above technical solution, the water is collected into the water collection box through the water-guiding plate, so that even when there is less rain, rainwater can still be collected into the water collection cavity.

[0046] In summary, this application includes at least one of the following beneficial effects:

[0047] 1. When water accumulates on the waterproof layer, the water-absorbing part absorbs the water, accelerating the speed at which the water gathers towards the inlet hole. At the same time, the up-and-down movement of the water collection box drives the squeezing plate to squeeze the water-absorbing part, keeping the water-absorbing part in a state of strong water absorption capacity, and the water absorbed by the water-absorbing part is discharged through the outlet hole.

[0048] 2. Use a water-blocking plate to intercept water seepage around the downpipe, reducing the amount of water accumulating on the waterproof layer. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the external structure of an embodiment of this application;

[0050] Figure 2 This is a cross-sectional schematic diagram of the collection box before it moves downwards in an embodiment of this application;

[0051] Figure 3 yes Figure 2 Enlarged schematic diagram of part A;

[0052] Figure 4 This is a schematic diagram of the internal cross-section of an embodiment of this application;

[0053] Figure 5 yes Figure 4 Enlarged schematic diagram of part B.

[0054] Reference numerals: 1. Downpipe; 11. Downhole; 12. Mounting groove; 13. Inlet hole; 14. Outlet hole; 15. Control groove; 16. Power hole; 17. Water supply hole; 2. Suction part; 3. Extrusion plate; 4. Water collection box; 41. Sealing plate; 42. Sliding hole; 43. Sealing ring; 44. Water collection cavity; 5. Control component; 51. Control block; 511. Control surface; 52. Control spring; 6. Power component; 61. Power bar; 62. Power spring; 7. First push bar; 71. Second push bar; 72. Upper drive block; 721. Upper drive surface; 73. Lower drive block; 731. Lower drive surface; 8. Water baffle; 81. Water supply surface; 9. Water guide plate. Detailed Implementation

[0055] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0056] This application discloses a roof drain structure. See also... Figure 1 The downpipe structure includes a downpipe 1, which is a circular tube. A downpipe hole 11 extending along the central axis is formed in the middle of the downpipe 1. The downpipe 1 is installed and fixed on the roof, and its bottom is connected to the building's drainage pipe. The outer periphery of the downpipe 1 is in contact with a rigid protective layer, insulation layer, and waterproof layer. The top end face of the downpipe 1 is located below the outermost rigid protective layer. During use, rainwater falls onto the rigid protective layer and then flows into the downpipe 1, eventually draining into the drainage pipe.

[0057] See Figure 2 and Figure 3 A baffle plate 8 is fixedly connected to the outer periphery of the downpipe 1. The baffle plate 8 extends circumferentially around the downpipe 1, and its top abuts against the bottom of the rigid protective layer. Multiple water inlets 17 are formed on the outer periphery of the downpipe 1, connecting to the downhole 11. These water inlets 17 are spaced apart circumferentially. The water inlets 17 are located above the baffle plate 8 and below the rigid protective layer. The baffle plate 8 has a water inlet surface 81 that is inclined downwards towards the water inlets 17 and extends circumferentially. When rainwater seeps downwards through the gap between the rigid protective layer and the downpipe 1, the rainwater first falls on the water inlet surface 81, then flows along the water inlet surface 81 towards the water inlets 17, and finally flows into the downhole 11 through the water inlets 17, greatly reducing the possibility of leakage between the rigid protective layer and the downpipe 1.

[0058] A circumferentially extending mounting groove 12 is formed inside the wall of the downpipe 1, and a circumferentially extending water inlet hole 13 is formed on the outer periphery of the downpipe 1, communicating with the mounting groove 12. The water inlet hole 13 is located below the baffle plate 8, and the bottom wall of the water inlet hole 13 is on the same plane as the top end face of the waterproof layer. When rainwater leaks through other gaps or means, causing water to accumulate on the top of the waterproof layer, the accumulated water can enter the mounting groove 12 through the water inlet hole 13. The downpipe 1 has a water outlet hole 14, which extends downward at an angle towards the downpipe 11. One side of the outlet hole 14 is located on the bottom wall of the mounting groove 12, and the other side of the outlet hole 14 is located on the wall of the downpipe 11. The accumulated water entering the mounting groove 12 can be discharged into the downpipe 11 through the water outlet hole 14.

[0059] The drain outlet structure also includes a water-absorbing part 2 and a squeezing plate 3. The water-absorbing part 2 can be made of yellow high-elasticity water-absorbing foam or PVA high-density water-absorbing sponge. The water-absorbing part 2 has a ring-shaped structure and is installed in the mounting groove 12. During use, the water-absorbing part 2 absorbs accumulated water, increasing the speed at which the accumulated water flows into the mounting groove 12 through the water inlet 13.

[0060] The extrusion plate 3 has a ring-shaped structure. The extrusion plate 3 slides up and down in the mounting groove 12, and the bottom of the extrusion plate 3 abuts against the top of the water-absorbing part 2. When the extrusion plate 3 presses down on the water-absorbing part 2, the rainwater absorbed in the water-absorbing part 2 flows into the drain hole 11 through the water outlet 14. When the extrusion plate 3 moves upward, the elastic deformation of the water-absorbing part 2 recovers. At this time, the water-absorbing part 2 absorbs the water accumulated on the top of the waterproof layer, so that the water accumulated around the drain hole 11 flows quickly towards the water inlet 13. After the water accumulated around the drain pipe 1 flows into the water inlet 13, the water accumulated on the outside will gather around the drain pipe 1, which facilitates the drainage of the water.

[0061] The drain structure also includes a water collection box 4, a water inlet plate 9, and a sealing plate 41. The water collection box 4 slides up and down within the drain hole 11, forming a water collection cavity 44. The water collection box 4 has a horizontally extending sliding hole 42 that communicates with the water collection cavity 44, with both sides of the sliding hole 42 penetrating the water collection box 4 to the outside. The sealing plate 41 slides within the sliding hole 42. When the sealing plate 41 is slid into the sliding hole 42, it seals the bottom opening of the water collection cavity 44; when the sealing plate 41 is slid outward from the sliding hole 42, the bottom opening of the water collection cavity 44 can be opened. The water collection box 4 is equipped with a sealing ring 43, which is fixed to the top wall of the sliding hole 42. The sealing ring 43 surrounds the drain hole 11 and slides in contact with the sealing plate 41, which helps to reduce the gap between the sealing plate 41 and the top wall of the sliding hole 42.

[0062] Multiple water-guiding plates 9 are fixed circumferentially to the wall of the downhole 11. The water-guiding plates 9 are located near the opening of the downhole 11 and above the water collection box 4, tilted downwards towards the water collection box 4. When rainwater enters the downhole 11 from the opening, some of the rainwater flows along the water-guiding plates 9 to the top of the water collection box 4 and flows into the water collection cavity 44 under the action of gravity. At this time, the rainwater collects in the water collection cavity 44, increasing the weight of the water collection box 4.

[0063] The drain outlet structure also includes a control component 5. Before the water collection box 4 is filled with water, the control component 5 controls the water collection box 4 to be in a position close to the water inlet plate 9. After the water collection box 4 is filled with water, the control component 5 controls the water collection box 4 to enter a downward movement state.

[0064] The control component 5 includes a control block 51 and a control spring 52. The downpipe 1 has a control groove 15 extending horizontally to communicate with the downhole 11. Multiple control grooves 15 are symmetrically arranged. The control block 51 is an elongated block structure and slides in the control groove 15 in a direction close to or away from the central axis of the downhole 11. The control spring 52 corresponds to each control block 51 and is installed within the control groove 15. One end of the control spring 52 abuts against the control block 51, and the other end abuts against the side wall of the control groove 15 away from the groove opening. When the control spring 52 is released elastically, it pushes the control block 51 to protrude into the downhole 11.

[0065] The top of the control block 51 is inclined to form a control surface 511. In the initial state, the bottom of the water collection box 4 abuts against the control surface 511, and the water collection box 4 remains adjacent to the water guide plate 9. When rainwater enters the water collection cavity 44 through the water guide plate 9, the weight of the water collection box 4 continuously increases, causing the water collection box 4 assembly to push the control block 51 into the control groove 15 until the water collection box 4 pushes the control block 51 until the vertical side wall of the control block 51 is on the same plane as the vertical side wall of the water collection box 4. At this time, the water collection box 4 slides down quickly, and the end of the control block 51 slides against the side wall of the water collection box 4.

[0066] The drain outlet structure also includes a power assembly 6, which includes a power strip 61. Multiple power holes 16 extending vertically are provided on the inner circumferential sidewall of the drain pipe 1, spaced circumferentially. These power holes 16 connect the mounting groove 12 and the drain hole 11. The power strip 61 is a long strip structure that slides up and down through the power holes 16. One end of the power strip 61 is fixed to the inner circumferential sidewall of the extrusion plate 3, and the other end is fixed to the outer circumferential sidewall of the water collection box 4. When the water collection box 4 moves downwards, the power strip 61 drives the extrusion plate 3 to move downwards simultaneously, causing the extrusion plate 3 to squeeze the water absorption part 2.

[0067] See Figure 4 and Figure 5The drain outlet structure includes a drive assembly, which comprises a lower drive block 73 and a second push bar 71. The lower drive block 73 is fixed to the wall of the drain hole 11 and located below the power bar 61. The second push bar 71 is fixed to one end of the sealing plate 41 and corresponds to the lower drive block 73. The lower drive block 73 is inclined and has a lower drive surface 731 facing the water collection box 4. When the water collection box 4 slides down until the squeezing plate 3 squeezes out the water in the water absorption part 2, the second push bar 71 slides on the lower drive surface 731, pushing the sealing plate 41 out of the sliding hole 42, so that the bottom opening of the water collection cavity 44 is opened. At this time, the water in the water collection cavity 44 is quickly discharged, and the weight of the water collection box 4 is quickly reduced.

[0068] See Figure 3 and Figure 5 The power assembly 6 also includes a power spring 62, which corresponds one-to-one with the power bar 61 and is installed within the power hole 16. One end of the power spring 62 abuts against the bottom of the power bar 61, and the other end abuts against the bottom wall of the power hole 16. When the power bar 61 moves downward with the water collection box 4, the power spring 62 enters an elastic contraction state. When the weight of the water collection box 4 decreases, the elasticity of the power spring 62 is released, pushing the power bar 61 upward, causing the water collection box 4 and the extrusion plate 3 to move back to their original positions.

[0069] The drive assembly also includes an upper drive block 72 and a first pusher 7. The first pusher 7 is fixed to the end of the sealing plate 41 facing away from the second pusher 71, and slides on the sliding hole 42. The upper drive block 72 is fixed to the side wall of the drain hole 11, and the upper drive block 72 corresponds to the lower drive block 73 and is staggered vertically. The upper drive block 72 corresponds to the first pusher 7, and the upper drive block 72 is inclined to form an upper drive surface 721 facing the water collection box 4. When the water collection box 4 moves upward to near the water inlet plate 9, the first pusher 7 slides on the upper drive surface 721. At this time, the upper drive block 72 pushes the first pusher 7 so that the sealing plate 41 seals the bottom cavity of the water collection chamber 44, and the water collection box 4 enters the water collection state again.

[0070] The implementation principle of a roof drain structure according to an embodiment of this application is as follows:

[0071] When it rains, the baffle plate 8 intercepts rainwater leaking between the downpipe 1 and the rigid protective layer, while the absorbent part 2 absorbs the water accumulated on top of the waterproof layer, causing the water around the downpipe 1 to collect at the inlet hole 13. After the rainwater enters through the downpipe hole 11, some of it enters the water collection chamber 44. At this point, the weight of the water collection box 4 begins to increase until it slides against the control block 51. The water collection box 4 then begins to move downwards. At this time, the squeezing plate 3 moves downwards with the water collection box 4 and squeezes the absorbent part 2, causing the water absorbed by the absorbent part 2 to be discharged through the outlet hole 14. When the water collection box 4 moves downwards until the second push bar 71 slides on the lower drive surface 731, the sealing plate 41 opens the bottom opening of the water collection chamber 44, and the collected water flows out from the bottom opening of the water collection chamber 44. At this time, the weight of the water collection box 4 decreases rapidly, and the power spring 62 drives the power bar 61 to move upwards, causing the water collection box 4 and the squeezing plate 3 to move upwards as well. At this time, the elastic deformation of the water suction part 2 recovers, and during the recovery process, the speed at which the water flow around the drain pipe 1 gathers is accelerated. When the water collection box 4 moves upwards until the first push bar 7 slides on the upper drive surface 721, the sealing plate 41 seals the bottom opening of the water collection chamber 44. At this time, the water collection box 4 enters the water collection state, and then the water collection box 4 and the squeezing plate 3 continuously repeat the above process during rain.

[0072] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A roof drain structure, characterized in that: include A downpipe (1) is installed on the roof. The downpipe (1) has a downhole (11) and a mounting groove (12) around the downhole (11) in the circumferential direction. The downpipe (1) has an inlet hole (13) that communicates with the mounting groove (12). The downpipe (1) has a water outlet (14), and one side of the water outlet (14) is connected to the bottom of the mounting groove (12) and the downpipe (11). The water-absorbing part (2) is installed in the mounting groove (12) and surrounds the drain hole (11). The extrusion plate (3) slides up and down in the mounting groove (12), and the extrusion plate (3) is located at the top of the water absorption part (2); The water collection box (4) slides up and down inside the drain hole (11), and the water collection box (4) forms a water collection cavity (44). The control component (5) is located on the downpipe (1). Before the water collection box (4) is filled with water, the control component (5) controls the water collection box (4) to be located close to the opening of the downpipe (11). After the water collection box (4) is filled with water, the control component (5) controls the water collection box (4) to slide downward. The power assembly (6) is located on the downpipe (1). When the water collection box (4) slides downward, the power assembly (6) drives the extrusion plate (3) to extrude the water absorption part (2). The sealing plate (41) slides at the bottom of the water collection box (4), and the sealing plate (41) can open or close the bottom cavity of the water collection chamber (44); A drive assembly is installed on the downpipe (1). After the squeezing plate (3) squeezes the water-absorbing part (2), the drive assembly drives the sealing plate (41) to open the bottom cavity of the water collection chamber (44). After the water in the water collection box (4) is discharged, the power component (6) drives the water collection box (4) to move upward. When the water collection box (4) moves upward, the driving component drives the sealing plate (41) to seal the bottom opening of the water collection cavity (44).

2. The roof drain structure according to claim 1, characterized in that: The control component (5) includes a control block (51) and a control spring (52); The downpipe (1) has a control groove (15) that communicates with the downhole (11), and the control block (51) slides in the control groove (15); The control spring (52) is installed in the control slot (15), and the control spring (52) drives the control block (51) to protrude into the drain hole (11); The control block (51) is inclined to form a control surface (511), and the bottom of the water collection box (4) slides on the control surface (511).

3. The roof drain structure according to claim 1, characterized in that: The power assembly (6) includes a power bar (61) and a power spring (62). The power strip (61) has multiple components and slides up and down on the downpipe (1). The two ends of the power strip (61) are respectively connected to the inner wall of the extrusion plate (3) and the outer wall of the water collection box (4). The power spring (62) is installed on the downpipe (1), and the power spring (62) drives the power bar (61) to move upward.

4. The roof drain structure according to claim 1, characterized in that: The drive assembly includes an upper drive block (72), a lower drive block (73), a first push bar (7), and a second push bar (71); The first push bar (7) and the second push bar (71) are respectively disposed on opposite side walls of the sealing plate (41); The upper drive block (72) and the lower drive block (73) are disposed opposite to each other on the wall of the drain hole (11), and the upper drive block (72) and the lower drive block (73) are offset vertically. The upper driving block (72) is inclined to form an upper driving surface (721) for the first push bar (7) to slide. When the first push bar (7) slides on the upper driving surface (721), the upper driving block (72) drives the sealing plate (41) to block the bottom cavity of the water collection cavity (44). The lower drive block (73) is inclined to form a lower drive surface (731) for the second push bar (71) to slide. When the second push bar (71) slides on the lower drive surface (731), the lower drive block (73) drives the sealing plate (41) to open the bottom cavity of the water collection cavity (44).

5. The roof drain structure according to claim 4, characterized in that: The water collection box (4) has a sliding hole (42) that extends horizontally and communicates with the drain hole (11), and the sealing plate (41) slides in the sliding hole (42). The water collection box (4) is provided with a sealing ring (43) located on the top wall of the sliding hole (42), and the sealing ring (43) slides in contact with the sealing plate (41).

6. The roof drain structure according to claim 1, characterized in that: The bottom wall of the water inlet hole (13) is on the same plane as the top of the waterproof layer.

7. The roof drain structure according to claim 1, characterized in that: A baffle plate (8) is formed on the outer periphery of the downpipe (1) along the circumferential direction, and a water conveying hole (17) is formed on the downpipe (1) to intercept the water flow of the baffle plate (8) and introduce it into the downhole (11).

8. A roof drain structure according to claim 7, characterized in that: The baffle plate (8) has a water conveying surface (81) that guides the water flow toward the water inlet (17).

9. A roof drain structure according to claim 1, characterized in that: The downpipe (1) is inclined and has a water guide plate (9) that guides the water flow toward the water collection box (4). There are multiple water guide plates (9) and they are arranged circumferentially on the side wall of the downpipe (11).

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