Built-in roof drainage mechanism

Abstract

The application relates to the field of building drainage, and particularly discloses a built-in roof drainage mechanism, which comprises a gutter and a water collecting well, the bottom of the water collecting well is connected with a drainage pipe, a flow collecting pipe is connected between the gutter and the water collecting well, a water collecting bin is connected between the gutter and the flow collecting pipe, a partition plate is fixedly connected in the water collecting bin, perforations are formed in the partition plate, a sleeve is arranged on the partition plate in the perforations, a gap is formed between the sleeve and the perforation wall, and a lifting rod is arranged in the sleeve; a floating ball above the partition plate is fixedly connected to the upper end of the lifting rod, a counterweight structure below the partition plate is arranged at the lower end of the lifting rod, and the projection of the floating ball on the partition plate covers the perforations; when the liquid level in the water collecting bin is higher than the floating ball, the buoyancy of the floating ball is greater than the total weight of the counterweight structure, the lifting rod and the floating ball. The application can greatly reduce the noise caused by the intermittent and frequent impact of small-flow rainwater on the wall of the flow collecting pipe when the rainfall is inconsistent by storing and controlling the indefinite rainwater through the water collecting bin.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building drainage, in particular to an internal roof drainage mechanism. BACKGROUND

[0002] A drainage system is often provided on the roof surface of a building, which mainly consists of a gutter and a water collecting well fixed on the roof of the building. When it rains, the rainwater flows to the gutter on the roof, and then flows to the water collecting well along the direction of the downspout. The outside of the water collecting well is connected to a drainage pipe, so that the rainwater continues to fall along the drainage pipe and is discharged. The internal drainage system mainly embeds the water collecting well and the drainage pipe, reducing the structural arrangement of the building facade.

[0003] A Chinese patent with publication number CN115711016A discloses an internal roof siphon drainage mechanism, which includes a roof net rack on the top of the building, a roof panel connected to the top of the roof net rack, a gutter in the middle of the roof panel, a downspout at the bottom of the gutter, a water collecting well below the roof panel and below the downspout, and a fixed bracket connecting the water collecting well to the roof net rack. The water collecting well is installed below the roof panel and connected to the roof net rack, so that the water collecting well is located on the inner side of the roof panel after installation, thereby reducing the occupation of the height space of the roof panel.

[0004] Although the above-mentioned related technology embeds the drainage system in the building, it can significantly improve the neatness of the building facade, but the rainwater in the gutter will frequently hit the pipe wall during the flow to the water collecting well due to the inconsistent amount of rain, which will produce noise and affect the noise control requirements in the building, increasing the difficulty of noise reduction design of the drainage system. SUMMARY

[0005] In order to solve the problem that the water flow in the pipe frequently hits the pipe wall and produces noise when the amount of rain is inconsistent, the present application provides an internal roof drainage mechanism.

[0006] The internal roof drainage mechanism provided by the present application adopts the following technical scheme:

[0007] An internal roof drainage mechanism, which comprises a gutter arranged on a building roof and a water collecting well arranged below the building roof, a drainage pipe connected to the bottom of the water collecting well, a flow collecting pipe connected between the gutter and the water collecting well, a water collecting chamber connected between the gutter and the flow collecting pipe, a partition plate fixed in the water collecting chamber, a perforation formed in the partition plate, a sleeve arranged in the perforation of the partition plate, a gap between the sleeve and the perforation wall, and a lifting rod arranged in the sleeve.

[0008] The upper end of the lifting rod is fixed with a float located above the partition plate, and the lower end is equipped with a counterweight structure located below the partition plate. The projection of the float on the partition plate covers the perforation. When the liquid level in the water collection tank is above the float, the buoyancy of the float is greater than the sum of the weights of the counterweight structure, the lifting rod, and the float.

[0009] By adopting the above technical solution, during rainfall, rainwater collects in the gutters and flows through the manifold to the collection well for storage, before being discharged through the drain pipe. During this process, rainwater in the gutters first collects in the collection chamber until the liquid level in the chamber exceeds the float. Under its own buoyancy, the float moves the lifting rod and counterweight structure upwards, releasing the float from the sealing effect on the perforations on the partition plate. Rainwater in the collection chamber then flows through the perforations into the lower manifold at a relatively constant flow rate and volume, reducing the frequent impact of small-flow rainwater on the manifold wall and effectively reducing noise generation. When the liquid level in the collection chamber drops, the buoyancy on the float decreases, and the float, under the action of the counterweight structure, moves downwards to seal the perforations, allowing rainwater to continue collecting in the collection chamber. This significantly reduces the noise caused by intermittent and frequent impacts of small-flow rainwater on the manifold wall when rainfall is inconsistent, thus improving building noise control.

[0010] Optionally, a guide cone coaxially arranged with the manifold is also fixed between the water collection tank and the manifold, with the tip of the guide cone facing the water collection tank and a gap between the bottom of the guide cone and the manifold.

[0011] By adopting the above technical solution, when rainwater in the collection tank flows through the perforation into the manifold, it first impacts the guide cone, and is then guided, dispersed, and slowed down by the cone surface of the guide cone as it flows into the circumference of the manifold. This allows the rainwater flowing into the manifold to flow in the manifold as close as possible to the inner wall of the manifold, which can further reduce the noise generated by the rainwater flowing in the manifold.

[0012] Optionally, the guide cone includes multiple fixed cones and multiple movable cones, the fixed cones and the movable cones are arranged adjacent to each other, and the multiple movable cones are fixed to the peripheral wall of the lifting rod; an adjustment mechanism is provided between the partition plate and the lifting rod to enable the lifting rod to rotate as the float rises after the lifting rod rises to a set height.

[0013] By adopting the technical scheme, after the rainwater flows into the collecting pipe at a constant flow, the multiple fixed conical plates and the multiple movable conical plates jointly guide the rainwater, and as the rainfall increases, the liquid level in the collecting bin continuously operates at a high position, so that the floating ball drives the lifting rod to continuously move up to a high point, at this time, the lifting rod realizes rotation of the lifting rod through the adjusting mechanism, and the lifting rod rotates to drive the multiple movable conical plates to synchronously rotate to overlap the multiple fixed conical plates, at this time, the guide conical cylinder is distributed with gaps after the multiple movable conical plates are removed, so that the rainwater can flow through the gaps and the gaps between the fixed conical plates and the collecting pipe, the influence of the guide conical cylinder on the rainwater flow can be reduced, and the rainwater can be guided as much as possible in heavy rainfall.

[0014] Optionally, the adjusting mechanism comprises a sliding convexity fixed to the inner wall of the sleeve and a cylindrical cam fixed to the circumferential side of the lifting rod, and a spiral groove on the cylindrical cam is matched with the sliding convexity.

[0015] By adopting the technical scheme, the lifting rod drives the cylindrical cam to ascend in the sleeve when following the floating ball, the sliding convexity in the sleeve slides in the spiral groove of the cylindrical cam, so that the cylindrical cam rotates in the sleeve during the ascending process, and further, the lifting rod rotates synchronously when ascending, thereby driving the multiple movable conical plates to rotate.

[0016] Optionally, one end of the cylindrical cam close to the collecting pipe is provided with a straight groove in communication with the spiral groove on the cylindrical cam, the straight groove is arranged along the axis direction of the cylindrical cam and is matched with the sliding convexity.

[0017] By adopting the technical scheme, when the rainfall is small, the sliding convexity in the sleeve slides in the straight groove, and the movable conical plates only ascend and descend following the lifting rod, so that the guide conical cylinder can maximize the diversion of a small amount of rainwater flowing into the collecting pipe, so that the rainwater flows along the pipe wall as much as possible to reduce noise; when the rainfall is large, the lifting rod ascends greatly, at this time, the sliding convexity in the sleeve slides in the spiral groove of the cylindrical cam, and the movable conical plates rotate synchronously when ascending and descending following the lifting rod, at this time, the guide conical cylinder mainly ensures smooth flow of a large amount of rainwater in the collecting pipe while retaining a part of the diversion effect of the rainwater.

[0018] Optionally, the radial edge of the fixed conical plate is fixed with a diversion strip, and the height of the diversion strip is not greater than the length of the straight groove.

[0019] By adopting the above technical scheme, when the rainfall is small, the lifting rod drives the plurality of movable conical plates to rise, the guide strip pluggs the gap between the adjacent fixed conical plate and movable conical plate to a certain extent, so as to ensure the guide effect of the guide cone cylinder on the small rainfall; at the same time, when the rainfall is large, since the height of the guide strip is not greater than the length of the straight groove, the movable conical plate can still rotate synchronously with the lifting rod, and the guide strip will not interfere with the rotation of the movable conical plate.

[0020] Optionally, the guide cone cylinder is provided with a porous block with pores in the inside on the side close to the partition plate.

[0021] By adopting the above technical scheme, the rainwater flowing through the perforation into the collecting pipe first hits the outer conical surface of the guide cone cylinder, that is, the rainwater first washes the porous block, which can effectively reduce the splashing phenomenon of the rainwater, weaken the flow rate and impact energy of the rainwater, and also reduce the noise generated when the rainwater is received in the collecting pipe to a certain extent.

[0022] Optionally, the collecting pipe is provided with a bubble layer opposite the conical bottom of the guide cone cylinder.

[0023] By adopting the above technical scheme, the setting of the bubble layer can further weaken the impact energy of the rainwater splashing from the conical bottom of the guide cone cylinder onto the collecting pipe, thereby further reducing the noise generated when the rainwater impacts the collecting pipe.

[0024] Optionally, the bottom of the floating ball is fixedly connected with a ring-shaped air bag in a semi-filled state.

[0025] By adopting the above technical scheme, the ring-shaped air bag in a semi-filled state can increase the buoyancy of the floating ball in water, and also increase the contact area of the floating ball when it is pressed against the partition plate.

[0026] Optionally, the upper end surface of the partition plate is provided with a recessed part matching the profile of the floating ball on the side of the perforation.

[0027] By adopting the above technical scheme, the contact area of the floating ball and the partition plate when they abut against each other can be increased, thereby improving the plugging effect of the floating ball on the perforation.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. Rainwater in the gutter first collects in the collection tank until it submerges the float. The float, under its own buoyancy, rises and falls, causing the rainwater in the collection tank to flow into the manifold below through the perforation at a relatively constant flow rate and volume. This reduces the frequent impact of small-flow rainwater on the manifold wall, thus effectively reducing noise generation. When the liquid level in the collection tank drops, the buoyancy of the float decreases, and the float, under the action of the counterweight structure, moves downward to seal the perforation, allowing rainwater to continue to collect in the collection tank. This significantly reduces the noise caused by the intermittent and frequent impact of small-flow rainwater on the manifold wall when rainfall is inconsistent, which is more conducive to building noise control.

[0030] 2. When rainwater in the collection tank flows through the perforations into the manifold, the cone surface of the guide cone guides, disperses, and slows down the flow of rainwater to the circumference of the manifold. This allows the rainwater flowing into the manifold to flow in a manner that is as close as possible to the inner wall of the manifold, which can further reduce the noise generated by the rainwater flowing in the manifold.

[0031] 3. The guide cone is configured with multiple fixed cones and multiple movable cones, and a cylindrical cam is set on the lifting rod, and a sliding convex part is set in the sleeve to slide and adapt to the spiral groove on the cylindrical cam. When the rainfall is small, the guide cone mainly guides the rainwater and reduces noise, and when the rainfall is large, the guide cone mainly dredges the rainwater, thereby ensuring the high-quality and high-noise-suppression drainage effect of the drainage mechanism of this application. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 This is a cross-sectional structural diagram of an embodiment of this application.

[0034] Figure 3 This embodiment of the application is mainly used to illustrate the structure of the guide cone, lifting rod, and cylindrical cam.

[0035] Figure 4 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0036] Reference numerals: 11. Gutter; 12. Collection well; 13. Drainage pipe; 14. Manifold; 141. Foaming layer; 2. Collection chamber; 21. Divider plate; 211. Perforation; 212. Recess; 22. Sleeve; 221. Sliding convexity; 31. Lifting rod; 32. Float; 33. Cylindrical cam; 331. Straight groove; 34. Annular airbag; 4. Guide cone; 41. Fixed cone; 42. Movable cone; 43. Guide strip; 44. Porous block. Detailed Implementation

[0037] The following is in conjunction with the appendixFigures 1-4 The application is further described in detail.

[0038] The application discloses an internal roof drainage mechanism. Referring to Figure 1 and Figure 2 , the internal roof drainage mechanism comprises a gutter 11 arranged on a building roof and a water collecting well 12 arranged below the building roof, the bottom of the water collecting well 12 is connected with a drainage pipe 13, and a flow collecting pipe 14 is connected between the gutter 11 and the water collecting well 12, the flow collecting pipe 14 can be arranged vertically or in a bent shape with a vertical section in the upper part. A water collecting chamber 2 is connected between the gutter 11 and the flow collecting pipe 14, a partition plate 21 is fixedly connected in the water collecting chamber 2, a through hole 211 is formed in the partition plate 21, a sleeve 22 coaxial with the through hole 211 is arranged in the through hole 211, a gap is formed between the sleeve 22 and the hole wall of the through hole 211, and a lifting rod 31 is arranged in the sleeve 22.

[0039] , referring to Figure 1 and Figure 2 , a floating ball 32 above the partition plate 21 is fixedly connected to the upper end of the lifting rod 31, a counterweight structure below the partition plate 21 is arranged at the lower end of the lifting rod 31, and the projection of the floating ball 32 on the partition plate 21 covers the through hole 211; when the liquid level in the water collecting chamber 2 is higher than the floating ball 32, the buoyancy of the floating ball 32 is greater than the total weight of the counterweight structure, the lifting rod 31 and the floating ball 32. The floating ball 32 can be a shell filled with air or a solid body made of foam material, and the lifting rod 31 should also be made of plastic with a small density.

[0040] Therefore, during rainfall, rainwater is first collected in the gutter 11 and then flows to the water collecting well 12 through the flow collecting pipe 14 for storage, and then is discharged through the drainage pipe 13; in this process, the rainwater in the gutter 11 is first collected in the water collecting chamber 2 until the liquid level in the water collecting chamber 2 is higher than the floating ball 32, and the floating ball 32 drives the lifting rod 31 and the counterweight structure to move upward under the action of its own buoyancy, the floating ball 32 removes the sealing effect of the through hole 211 on the partition plate 21, and the rainwater in the water collecting chamber 2 flows into the flow collecting pipe 14 below from the through hole 211 at a relatively constant flow rate and flow volume, thereby reducing the frequent impact of small flow rainwater on the wall of the flow collecting pipe 14 and effectively reducing the generation of noise.

[0041] When the liquid level in the water collecting chamber 2 decreases, the buoyancy acting on the floating ball 32 decreases, and the floating ball 32 drives the floating ball 32 to move downward under the action of the counterweight structure to block the through hole 211, and the rainwater in the water collecting chamber 2 continues to collect; the cycle is repeated, thereby greatly reducing the noise caused by the intermittent and frequent impact of small flow rainwater on the wall of the flow collecting pipe 14 when the rainfall is inconsistent, and being more conducive to noise control of the building.

[0042] To further reduce the noise generated when rainwater impacts the wall of the flow collecting pipe 14, referring to Figure 2 andFigure 3 The water collecting chamber 2 and the collecting pipe 14 are further fixedly connected with a flow guide cone cylinder 4 coaxially arranged with the collecting pipe 14, the tip of the flow guide cone cylinder 4 is directed towards the water collecting chamber 2, the flow guide cone cylinder 4 has a gap between the bottom and the collecting pipe 14, and the flow guide cone cylinder 4 is arranged in the collecting pipe 14 through a plurality of support rods. More specifically, the flow guide cone cylinder 4 comprises a plurality of fixed cone plates 41 and a plurality of movable cone plates 42, the fixed cone plates 41 and the movable cone plates 42 are arranged adjacently, and the plurality of movable cone plates 42 are fixedly connected to the peripheral wall of the lifting rod 31. Among them, the width of the movable cone plate 42 is not greater than the width of the fixed cone plate 41, and in the embodiment, the width of the movable cone plate 42 is the same as that of the fixed cone plate 41, and the plurality of movable cone plates 42 and the plurality of fixed cone plates 41 are distributed in an equidistant circumferential array along the axial direction of the lifting rod 31.

[0043] Further, referring to Figure 2 and Figure 4 , the adjusting mechanism is arranged between the partition plate 21 and the lifting rod 31 to realize the rotation of the lifting rod 31 after the lifting rod 31 is lifted to a set height and then follows the lifting of the floating ball 32; the adjusting mechanism comprises a sliding convex 221 fixedly connected to the inner wall of the sleeve 22 and a cylindrical cam 33 fixedly connected to the peripheral side of the lifting rod 31, and the helical groove on the cylindrical cam 33 is slidably matched with the sliding convex 221. In specific implementation, considering the water passing amount of the perforation 211, the length of the sleeve 22 is set to be greater than the thickness of the partition plate 21, and the part of the sleeve 22 located at the lower end surface of the partition plate 21 is an expanded diameter part, and the cylindrical cam 33 is arranged in the expanded diameter part, which can not only ensure the large water passing amount of the perforation 211, but also ensure the stable control of the cylindrical cam 33 on the lifting rod 31.

[0044] After the rainwater flows into the collecting pipe 14 at a constant flow rate, the plurality of fixed cone plates 41 and the plurality of movable cone plates 42 jointly guide the rainwater, so that the rainwater flowing into the collecting pipe 14 flows in the collecting pipe 14 in the form of closely adhering to the inner wall of the collecting pipe 14 as much as possible, which can further reduce the noise generated by the rainwater flowing in the collecting pipe 14. With the increase of the rainfall, the liquid level in the water collecting chamber 2 continuously maintains high position operation, so that the floating ball 32 drives the lifting rod 31 to continuously move upwards to the high point, the sliding convex 221 in the sleeve 22 slides in the helical groove of the cylindrical cam 33, so that the cylindrical cam 33 drives the lifting rod 31 and the plurality of movable cone plates 42 thereon to rotate to overlap one by one with the plurality of fixed cone plates 41 during the lifting of the cylindrical cam 33 in the sleeve 22. At this time, the flow guide cone cylinder 4 is distributed with gaps after the plurality of movable cone plates 42 are removed, so that the rainwater can flow through the gaps and the gaps between the fixed cone plates 41 and the collecting pipe 14, which can reduce the influence of the flow guide cone cylinder 4 on the rainwater flow, and can ensure the dredging effect of the rainwater as much as possible in heavy rain.

[0045] At the same time, in order to avoid the rotation of the movable cone plate 42 following the lifting of the lifting rod 31 when the rainfall is small, and the loss of the rainwater guiding effect of the flow guide cone 4 when the rainfall is small, referring to Figure 2 and Figure 3 Further, a straight groove 331 is formed on one end of the cylindrical cam 33 close to the collecting pipe 14, which is in communication with the helical groove on the cylindrical cam 33 and is arranged along the axis direction of the cylindrical cam 33 and is in sliding fit with the sliding convex 221.

[0046] In this way, when the rainfall is small, the sliding convex 221 in the sleeve 22 slides in the straight groove 331, and the movable cone plate 42 only lifts following the lifting of the lifting rod 31, and the flow guide cone 4 can maximize the guiding of the small amount of rainwater collected into the collecting pipe 14, so that the rainwater flows along the wall of the collecting pipe 14 as much as possible to reduce the noise; when the rainfall is large, the lifting rod 31 has a large lifting amplitude, at this time the sliding convex 221 in the sleeve 22 slides in the helical groove of the cylindrical cam 33, and the movable cone plate 42 also rotates synchronously when following the lifting of the lifting rod 31, at this time the flow guide cone 4 mainly ensures the smooth flow of a large amount of rainwater in the collecting pipe 14 while retaining part of the rainwater guiding effect.

[0047] In this way, the drainage mechanism of the present application improves the problem of too much noise generated in the collecting pipe 14 when the rainfall is not constant. In the first aspect, the water collecting bin 2 is arranged to temporarily store rainwater, and when the predetermined water level is reached, the floating ball 32 can automatically unblock the perforation 211 by the buoyancy to make the constant amount of rainwater flow into the collecting pipe 14, thereby reducing the generation of noise from the frequency of rainwater impacting the collecting pipe 14; in the second aspect, the flow guide cone 4 is arranged in the collecting pipe 14 to further guide the small flow of rainwater to flow along the wall, thereby reducing the generation of noise from the probability and intensity of rainwater impacting the wall of the collecting pipe 14; in the third aspect, the flow guide cone 4 is arranged as a plurality of fixed cone plates 41 and a plurality of movable cone plates 42, and the cylindrical cam 33 is arranged on the lifting rod 31, the straight groove 331 is arranged on the cylindrical cam 33, and the sliding convex 221 is arranged in the sleeve 22 and is in sliding fit with the helical groove and the straight groove 331 on the cylindrical cam 33, so that when the rainfall is small, the flow guide cone 4 mainly has the effect of guiding and reducing noise, and when the rainfall is large, the flow guide cone 4 mainly has the effect of dredging, thereby ensuring the high-quality and high-noise-reducing drainage effect of the drainage mechanism of the present application, and the drainage mechanism is suitable for flexible and autonomous adjustment under most rainfall conditions.

[0048] As an optimization of applicability, on the one hand, referring to Figure 2 and Figure 3 the flow guide strips 43 are fixedly connected to the two edges of the fixed cone plate 41 in the radial direction, and the height of the flow guide strips 43 is not greater than the groove length of the straight groove 331; on the other hand, referring to Figure 2, the side of the flow guide cone cylinder 4 close to the partition plate 21 is installed with a porous block 44 with internal porosity, the porous block 44 can be sponge, glass fiber, activated carbon, ceramic particles, etc., considering that the movable cone sheet 42 needs to be lifted along with the lifting rod 31, it is necessary to limit that only sponge, glass fiber, etc. with lighter quality can be installed on the movable cone sheet 42, and the part of the flow collector 14 opposite to the bottom of the flow guide cone cylinder 4 is installed with a bubble layer 141, and the bubble layer can be a bubble net or a three-dimensional filter screen.

[0049] At the same time, referring to Figure 2 , the bottom of the floating ball 32 is fixedly connected with a ring-shaped air bag 34 in a semi-filled state, and the upper end surface of the partition plate 21 is provided with a recessed part 212 adapted to the contour of the floating ball 32 around the through hole 211. The contact area of the floating ball 32 and the partition plate 21 can be significantly increased when they abut against each other, thereby improving the sealing effect of the floating ball 32 on the through hole 211.

[0050] And, for the aforementioned counterweight structure installed at the bottom end of the lifting rod 31, the counterweight structure can be a separately arranged counterweight block, or can be directly regarded as the combination of the aforementioned cylindrical cam 33 and the plurality of movable cone sheets 42, in this embodiment, the cylindrical cam 33 and the movable cone sheet 42 are directly selected instead of separately arranging the counterweight block.

[0051] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A built-in roof drainage mechanism, comprising a gutter (11) arranged on a building roof and a water collecting well (12) arranged below the building roof, a bottom of the water collecting well (12) being connected with a drainage pipe (13), and a collecting pipe (14) being connected between the gutter (11) and the water collecting well (12), characterized in that: The gutter (11) is connected with the collecting tank (2) and the collecting tank (2) is fixedly connected with the partition plate (21), the perforated hole (211) is arranged in the partition plate (21), the sleeve (22) is arranged in the perforated hole (211), the gap is formed between the sleeve (22) and the hole wall of the perforated hole (211), and the lifting rod (31) is arranged in the sleeve (22); the upper end of the lifting rod (31) is fixedly connected with the floating ball (32) arranged above the partition plate (21), and the lower end is provided with the counterweight structure arranged below the partition plate (21), the projection of the floating ball (32) on the partition plate (21) covers the perforated hole (211); when the liquid level in the collecting tank (2) is higher than the floating ball (32), the buoyancy of the floating ball (32) is greater than the total weight of the counterweight structure, the lifting rod (31) and the floating ball (32). The collecting tank (2) is fixedly connected with the flow guide cone cylinder (4) coaxially arranged with the collecting pipe (14), the tip of the flow guide cone cylinder (4) faces the collecting tank (2), and the gap is formed between the bottom of the flow guide cone cylinder (4) and the collecting pipe (14). The flow guide cone cylinder (4) comprises a plurality of fixed cone plates (41) and a plurality of movable cone plates (42), the fixed cone plates (41) and the movable cone plates (42) are arranged adjacent to each other, and a plurality of the movable cone plates (42) are fixedly connected to the peripheral wall of the lifting rod (31); the adjusting mechanism is arranged between the partition plate (21) and the lifting rod (31) to realize the rotation of the lifting rod (31) after the lifting rod (31) is lifted to a set height and the lifting rod (31) is lifted along with the floating ball (32).

2. A built-in roof drainage mechanism according to claim 1, characterized in that: The adjusting mechanism comprises the slide convex (221) fixedly connected to the inner wall of the sleeve (22) and the cylindrical cam (33) fixedly connected to the peripheral side of the lifting rod (31), and the spiral groove on the cylindrical cam (33) is slidably matched with the slide convex (221).

3. A built-in roof drainage mechanism according to claim 2, characterized in that: The one end of the cylindrical cam (33) close to the collecting pipe (14) is provided with the straight groove (331) communicated with the spiral groove on the cylindrical cam (33), the straight groove (331) is arranged along the axis direction of the cylindrical cam (33) and is slidably matched with the slide convex (221).

4. A built-in roof drainage mechanism according to claim 3, characterized in that: The radial edge of the fixed cone plate (41) is fixedly connected with the flow guide strip (43), and the height of the flow guide strip (43) is not greater than the groove length of the straight groove (331).

5. A built-in roof drainage mechanism according to any one of claims 1-4, characterized in that: The flow guide cone cylinder (4) is provided with the porous block (44) with pores on one side close to the partition plate (21).

6. A built-in roof drainage mechanism according to claim 5, characterized in that: The collecting pipe (14) is provided with the foaming layer (141) opposite to the bottom of the flow guide cone cylinder (4).

7. A built-in roof drainage mechanism according to any one of claims 1-4, characterized in that: The bottom of the floating ball (32) is fixedly connected with the annular air bag (34) in a semi-filled state.

8. A built-in roof drainage mechanism according to claim 7, characterized in that: The upper end surface of the partition plate (21) is provided with the recessed part (212) matched with the contour of the floating ball (32) on the peripheral side of the perforated hole (211).

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