CN115434388A

CN115434388A - Building roof rainwater recovery system

Info

Publication number: CN115434388A
Application number: CN202211267865.5A
Authority: CN
Inventors: 朱永明
Original assignee: Shenzhen Xinglande Engineering Consultant Co ltd
Current assignee: Shenzhen Xinglande Engineering Consultant Co ltd
Priority date: 2022-10-17
Filing date: 2022-10-17
Publication date: 2022-12-06

Abstract

The application relates to the technical field of rainwater recovery, and particularly discloses a building roof rainwater recovery system which comprises a rainwater collection device and an irrigation device, wherein the rainwater collection device stores water for the irrigation device, the rainwater collection device is arranged on a building, a greening box is arranged on the building, water diversion cotton is arranged between the greening box and the irrigation device, and the water diversion cotton is used for leading rainwater in the irrigation device into the greening box; irrigation equipment is provided with the raceway including irrigation box and control switch subassembly on the irrigation box, be provided with the water pump on the raceway, and when the water yield dropped to a take the altitude, control switch subassembly control water pump was opened, impounds to the irrigation box in, and when the water yield rose to a take the altitude, control switch subassembly control water pump was closed to realize rainwater collecting system's automatic retaining irrigation. This application has the effect of realizing rainwater collection system's automatic retaining irrigation.

Description

Building roof rainwater recovery system

Technical Field

The application relates to the technical field of rainwater recovery, in particular to a building roof rainwater recovery system.

Background

Along with the acceleration of urbanization pace, original natural system has received the influence, and the soil in the city has become impermeable surface such as reinforced concrete, asphalt road surface, leads to a series of problems such as city rainwater emission in a large number, ground subsidence, adopts rainwater collection system to collect partial rainwater, and the rainwater that collects can carry out the water delivery irrigation to the balcony garden of each floor in urban building.

Rainwater collection system among the correlation technique includes the header tank, plants the case, suction pump and water storage box, and the header tank is collected the rainwater, and the header tank supplies water for the water storage box when the water yield is not enough in the water storage box, and the water supply in planting the case is extracted at the water storage box through the suction pump, realizes the collection and the utilization of rainwater, but rainwater collection system among the correlation technique need draw water the watering through the suction pump after the humidity of observing soil, has the problem that can not automatic retaining watering.

Therefore, the rainwater collecting system of the technical scheme has the problem that water cannot be automatically stored and watered.

Disclosure of Invention

In order to realize the automatic water storage irrigation of the rainwater collection system, the application provides a building roof rainwater recovery system.

The application provides a building roof rainwater recovery system adopts following technical scheme:

a building roof rainwater recovery system comprising:

the rainwater collecting device is arranged on a building, a greening box is arranged on the building, and the rainwater collecting device comprises a water collecting box for storing water and irrigating;

the irrigation device comprises an irrigation box and a control switch assembly arranged in the irrigation box, the irrigation box is arranged on the outer side of the greening box, water diversion cotton is arranged in a soil layer of the greening box, and the water diversion cotton extends downwards into the irrigation box and is used for absorbing water;

a water delivery pipe is arranged between the water collecting tank and the irrigation tank, a water pump is arranged on the water delivery pipe, and the control switch assembly is used for controlling the on-off of the water pump according to the depth of the water level in the irrigation tank, so that the water collected in the water collecting tank is guided to the irrigation tank by the water delivery pipe.

Based on the technical scheme, when raining, rainwater is collected through the water collecting tank and stored; water diversion cotton is arranged between the irrigation device and the greening box, and when the greening box is lack of water, the water diversion cotton automatically irrigates water in the irrigation device into the greening box, so that the automatic irrigation of the greening box is realized; when lacking water in the irrigation box of the irrigation device, the control switch component control water pump and the electromagnetic valve are opened simultaneously, water in the water collecting tank is injected into the irrigation box, impurities in the irrigation box are driven to be discharged from the drain outlet, after the impurities are discharged, the drainage gate component blocks water to flow out of the drain pipe, the water quantity in the irrigation box is increased gradually, the control switch component control water pump and the electromagnetic valve are closed when the water quantity is increased to a certain height, and automatic water storage irrigation of the rainwater collecting system is achieved.

Preferably, the control switch assembly comprises a limiting rod and a buoyancy piece, the limiting rod is fixedly arranged in the irrigation box along the vertical direction, the buoyancy piece is arranged on the limiting rod in a sliding manner, the buoyancy piece is provided with a floating inner cavity so that the buoyancy piece can float up and down along with the water level, the top end of the limiting rod is provided with a first contact switch, the bottom end of the limiting rod is fixedly connected with a limiting ring, and a second contact switch is arranged on the limiting ring;

the first contact switch and the second contact switch are electrically connected with the water pump, when the buoyancy piece moves downwards along with the water level to trigger the second contact switch, the second contact switch controls the water pump to be switched on, and when the buoyancy piece moves upwards along with the water level to trigger the first contact switch, the first contact switch controls the water pump to be switched off.

Based on above-mentioned technical scheme, first when the water level reduces gradually, the buoyancy piece moves towards the direction of spacing ring, and when the water level reduced to a certain extent, the buoyancy piece triggered the second contact switch on the spacing ring, and second contact switch control water pump is opened, and the water pump is with the water injection irrigation incasement in the header tank, and when irrigation incasement water level reached the highest, the buoyancy piece triggered first contact switch, and first contact switch control water pump is closed.

Preferably, the irrigation tank is communicated with a drain pipe, a water inlet end of the drain pipe is arranged opposite to a water outlet end of the water delivery pipe, and the drain pipe and the water delivery pipe are both arranged at the bottom of the irrigation tank;

a movable plate is arranged in the irrigation box, the central position of the movable plate is fixedly connected with the bottom wall of the irrigation box to form a fixed part, the extending direction of the fixed part points to the pipe orifices of the sewage discharge pipe and the water delivery pipe, and the movable plate forms tilting parts on two sides by taking the fixed part as a symmetry axis;

and a pull rope is connected between the buoyancy piece and the edge position of the movable plate, and when the buoyancy piece moves upwards, the tilting part tilts through the pull rope.

Based on above-mentioned technical scheme, the intermediate position of fly leaf is fixed, and along with the decline of irrigation incasement water level, buoyancy spare also can slowly descend thereupon, and buoyancy spare drives the fly leaf through the stay cord and rises for the perk portion perk on the fly leaf, the impurity in the perk portion assembles the fixed part, opens the water pump, and rivers drive impurity and discharge from the blow off pipe.

Preferably, a pulley is arranged in the irrigation box, the pull rope is wound on the pulley, two pulleys are arranged on the pull rope, and the two pulleys are symmetrically arranged on two sides of the buoyancy piece so that the two pull ropes have the same pulling force.

Based on above-mentioned technical scheme, the fly leaf is connected through the stay cord with buoyancy, and the pulley is used for changing the pulling force direction, and two sets of pulleys set up about buoyancy symmetry and make the pulling force of both sides stay cord pulling fly leaf the same, and when buoyancy moved down, the stay cord can drive fly leaf both sides upward movement formation perk portion.

Preferably, the building roof rainwater recovery system further comprises a drainage gate assembly, the drainage gate assembly comprises a baffle which is arranged in the irrigation box in a sliding manner along the vertical direction, the baffle is square, and the baffle is arranged on one side close to the water inlet end of the drain pipe;

when the two sides of the movable plate are tilted, the tilting part supports the baffle to move upwards, so that the movable plate and the bottom surface of the baffle generate a drainage channel for water to pass through, and sewage is discharged conveniently.

Based on above-mentioned technical scheme, when the fly leaf rose, the baffle also can upwards rise a section distance, formed drainage channel between the bottom surface of baffle this moment and the fly leaf, opened the water pump and can follow in the drainage channel impurity dashes into the sewage pipes, along with the increase of the water yield in the irrigation tank, buoyancy spare upward movement for fly leaf downstream, because action of gravity, the baffle sheltered from the mouth of pipe of sewage pipes gradually, when buoyancy spare rose to trigger first contact switch, the water pump stopped the water injection.

Preferably, the cross-sectional area of the mouth of the water pipe is larger than the cross-sectional area of the drainage channel when the drainage channel is maximum.

Based on above-mentioned technical scheme, when the water pump was to the irrigation case water injection, because the orificial cross sectional area of raceway is greater than the cross sectional area when drainage channel is the biggest, water level in the irrigation case can constantly rise to make buoyancy spare trigger first contact switch, the water pump stops the water injection.

Preferably, the drain pipe is provided with an electromagnetic valve, the electromagnetic valve is electrically connected with both the first contact switch and the second contact switch, and the electromagnetic valve is synchronously switched on and off with the water pump.

Based on above-mentioned technical scheme, at the in-process of the slow perk of fly leaf, drainage channel also can crescent, for preventing to irrigate the loss of incasement rainwater and set up the solenoid valve, can stop the water of irrigating the incasement when the solenoid valve is closed and flow out from the blow off pipe, when buoyancy spare triggered the second contact switch, raceway and blow off pipe were opened simultaneously and are made impurity discharge, when buoyancy spare triggered first contact switch, irrigated the case and accomplished the water injection, raceway and blow off pipe are closed simultaneously.

Preferably, the control switch assemblies are arranged in two groups, one group of the control switch assemblies is arranged close to the water conveying pipe, and the other group of the control switch assemblies is arranged close to the sewage discharge pipe.

Based on above-mentioned technical scheme, two sets of control switch subassemblies change in the tilting of pulling fly leaf and form the perk portion.

Preferably, the edge of the movable plate is attached to the inner wall of the irrigation box.

Based on above-mentioned technical scheme, the edge of fly leaf is laminated mutually with the inner wall of irrigation box to avoid impurity to enter into between irrigation box diapire and the fly leaf.

Preferably, the buoyancy piece is a hollow iron ball; or/and a limiting slide rod is arranged at the position, close to the sewage discharge pipe, in the irrigation box, and the baffle is connected with the limiting slide rod in a sliding manner.

Based on the technical scheme, the buoyancy piece is a hollow iron ball, so that the tension on the movable plate can be increased, and the edge of the movable plate can be conveniently tilted; the position of the baffle is limited by the limiting slide rod, so that the water in the irrigation box is prevented from flowing out of the sewage discharge pipe due to the position deviation of the baffle.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the water in the irrigation device can be automatically irrigated into the greening box through the water diversion cotton, automatic supply is realized when the greening box is short of water, the on-off of the water pump is controlled by the control switch component according to the depth of the water level in the irrigation box, automatic water storage for the irrigation device is realized, and therefore automatic water storage irrigation of the rainwater recovery system is realized;

2. the buoyancy piece rolls up the edge of the movable plate through the pull rope, impurities are gathered to the middle position of the irrigation tank, and the buoyancy piece triggers the second contact switch to open the water pump and the electromagnetic valve, so that pollution discharge is realized;

3. when the movable plate is tilted, the area of a drainage channel formed between the baffle plate and the movable plate is smaller than that of the water delivery pipe, so that the inflow quantity of water is greater than the outflow quantity of water, and the irrigation tank is stored with water.

Drawings

FIG. 1 is a schematic structural diagram of a rainwater collection system according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a rainwater collection device according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of an irrigation device according to an embodiment of the present application, which mainly shows the state of rain water filling in an irrigation tank;

FIG. 4 is a schematic diagram of the structure of FIG. 3 from different viewing angles;

FIG. 5 is a schematic view of the irrigation tank of the embodiment of the present application in a water-deficient state;

FIG. 6 is a schematic diagram of the structure of FIG. 5 from a different perspective;

fig. 7 is a side view of an irrigation device embodying the present application, primarily showing drainage channels formed between the baffle and the movable plate.

Description of the reference numerals: 10. a rainwater collection device; 11. a water collection tank; 111. a first filter screen; 20. an irrigation device; 21. an irrigation tank; 211. water is led to the cotton; 212. a movable plate; 213. a fixed part; 214. a tilting part; 22. a control switch assembly; 221. a limiting rod; 222. a buoyancy member; 223. a limiting ring; 224. a pulley; 225. pulling a rope; 23. a drain gate assembly; 231. a baffle plate; 232. a spring; 233. a limiting slide bar; 24. a water delivery pipe; 25. a water pump; 26. a first contact switch; 27. a second contact switch; 28. a sewage discharge pipe; 29. an electromagnetic valve; 30. a greening box; 31. a vegetable layer; 32. a soil layer; 40. a drainage channel.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

The embodiment of the application discloses a building roof rainwater recovery system. Referring to fig. 1, the building roof rainwater recycling system comprises a rainwater collecting device 10 and an irrigation device 20, wherein the rainwater collecting device 10 is arranged on a building, the rainwater collecting device 10 is connected with the irrigation device 20, and the rainwater collecting device 10 supplies water for the irrigation device 20.

Referring to fig. 1, the rainwater collection device 10 includes a water collection tank 11, each floor of the building is provided with a greening tank 30, the irrigation device 20 is arranged at the bottom of the greening tank 30, the irrigation device 20 includes an irrigation tank 21, a water pipe 24 is communicated between the water collection tank 11 and the irrigation tank 21, and rainwater in the water collection tank 11 is conveyed into the irrigation tank 21 through the water pipe 24.

Referring to fig. 2, the water collection tank 11 is provided with a first filter 111, and the first filter 111 may filter impurities when rainwater is collected in a rainy day.

Referring to fig. 3, a soil layer is provided in the greening box 30, on which plants can be planted, and the greening box 30 is provided above the irrigation box 21. Be provided with the cotton 211 of diversion between irrigation case 21 and the afforestation case 30, all be provided with the through-hole that supplies the cotton 211 of diversion to pass on afforestation case 30 and the irrigation case 21, the upper end of the cotton 211 of diversion extends to the soil horizon, and the lower extreme of the cotton 211 of diversion passes the through-hole and extends to irrigation case 21 bottom, and the cotton 211 of diversion supplies water for the soil horizon.

Referring to fig. 4 and 5, the water pipe 24 is disposed at the bottom of the irrigation tank 21, a drainage pipe 28 is disposed on one side of the irrigation tank 21 opposite to the water pipe 24, and a water inlet end of the drainage pipe 28 is flush with a water outlet end of the water pipe 24. The water pipe 24 is provided with a water pump 25, and the sewage discharge pipe 28 is provided with an electromagnetic valve 29. The bottom of the irrigation box 21 is provided with a movable plate 212, the movable plate 212 comprises a fixing portion 213 and two sets of tilting portions 214, the fixing portion 213 is located in the middle of the movable plate 212, the fixing portion 213 extends from the pipe orifice of the water pipe 24 to the pipe orifice of the sewage pipe 28, the two sets of tilting portions 214 are symmetrically arranged relative to the fixing portion 213, when the tilting portions 214 tilt, impurities on the tilting portions 214 flow onto the fixing portion 213 along with water flow, when the water pipe 24 delivers water, the impurities on the movable plate 212 can be flushed into the sewage pipe 28, and the movable plate 212 is made of elastic materials which are easy to generate elastic deformation.

Referring to fig. 3, two sets of control switch assemblies 22 are further disposed in the irrigation tank 21, one set of control switch assemblies 22 is disposed at a side close to the water pipe 24, and the other set of control switch assemblies 22 is disposed at a side of the sewage pipe 28. The control switch assembly 22 comprises a limiting rod 221, the limiting rod 221 is arranged in the vertical direction, the limiting rod 221 is fixedly connected with the top of the irrigation tank 21, a buoyancy piece 222 is arranged on the limiting rod 221 in a sliding mode, the buoyancy piece 222 is a round iron ball with certain weight, the buoyancy piece 222 is provided with a floating inner cavity so that the buoyancy piece 222 can float up and down according to the change of the water level, and a limiting ring 223 is fixedly connected to the bottom end of the limiting rod 221 so as to prevent the buoyancy piece 222 from being separated from the limiting rod 221.

Referring to fig. 3, a first contact switch 26 and a second contact switch 27 are provided on one set of control switch assembly 22, the first contact switch 26 is fixedly connected with the top of the limiting rod 221, when the water level of the irrigation tank 21 rises, the buoyancy member 222 rises to trigger the first contact switch 26, and the first contact switch 26 controls the closing of the water pump 25 and the electromagnetic valve 29. The second contact switch 27 is fixedly connected to the limiting ring 223, when the water level of the irrigation tank 21 drops, the buoyancy member 222 drops to trigger the second contact switch 27, and the second contact switch 27 is used for controlling the opening of the water pump 25 and the electromagnetic valve 29.

Referring to fig. 4 and 5, pulleys 224 are symmetrically arranged on both sides of the buoyancy member 222, the pulleys 224 are rotatably connected to the side walls of the irrigation tank 21, a draw rope 225 is arranged between the buoyancy member 222 and the movable plate 212, one end of the draw rope 225 is fixedly connected to the buoyancy member 222, and the other end of the draw rope 225 is fixedly connected to the edge position of the movable plate 212 by winding the pulleys 224, when the buoyancy member 222 descends, the draw rope 225 can pull the tilting portion 214 of the movable plate 212 to move upwards, so that the tilting portion 214 of the movable plate 212 tilts, impurities are collected at the middle position of the movable plate 212, the impurities are conveniently discharged when the water pump 25 is opened, and when the buoyancy member 222 ascends, the edge of the movable plate 212 moves downwards to return to a flat state.

Referring to fig. 4 and 5, a drainage gate assembly 23 is arranged on one side of the irrigation tank 21 close to the sewage discharge pipe 28, the drainage gate assembly 23 comprises a limiting slide bar 233 and a baffle 231, the limiting slide bar 233 is arranged between the upper bottom and the lower bottom of the irrigation tank 21 along the vertical direction, the baffle 231 is connected in the limiting slide bar 233 in a sliding manner, a spring 232 is fixedly connected to the upper surface of the baffle 231, and the other end of the spring 232 is fixedly connected with the top of the irrigation tank 21.

Referring to fig. 6 and 7, the baffle 231 is square, when the rainwater in the irrigation tank 21 is in a full state, the lower surface of the baffle 231 abuts against the movable plate 212, and the baffle 231 tightly blocks the opening of the drainage pipe 28; when rainwater in the irrigation tank 21 is in an empty state, the tilting portion 214 of the movable plate 212 tilts, the tilting portion 214 pushes the baffle 231 to move upwards, a drainage channel 40 is formed between the bottom surface of the baffle 231 and the movable plate 212 at the moment, and impurities can be drained through the drainage channel 40.

Referring to fig. 6 and 7, the sectional area of the drain passage 40 at the maximum is smaller than the sectional area of the nozzle of the water transport pipe 24. When the water pump 25 and the electromagnetic valve 29 are just opened, the cross-sectional area of the drainage channel 40 is the largest, at the moment, water in the water pump 25 flushes impurities on the movable plate 212 into the sewage discharge pipe 28, the cross-sectional area of the drainage channel 40 when the drainage channel 40 is the largest is smaller than the cross-sectional area of the pipe orifice of the water conveying pipe 24, the inflow amount of water in the irrigation tank 21 is larger than the outflow amount of water, the water level in the irrigation tank 21 gradually rises, so that the buoyancy piece 222 gradually rises, the tilting radian of the tilting part 214 gradually decreases, the baffle 231 moves downwards under the action of the elastic force and the gravity of the spring 232, so that the cross-sectional area of the drainage channel 40 gradually decreases, when the water level rises to the first contact switch 26, the buoyancy piece 222 triggers the first contact switch 26 to close the water pump 25 and the electromagnetic valve 29, and automatic water storage of the irrigation device 20 is realized.

The implementation principle of the building roof rainwater recovery system in the embodiment of the application is as follows: in rainy days, the water collecting tank 11 collects rainwater, the rainwater in the water collecting tank 11 is used for being supplied into the irrigation tank 21, the water diversion cotton 211 is arranged between the irrigation tank 21 and the greening tank 30, and when the soil layer in the greening tank 30 is lack of water, the water diversion cotton 211 automatically absorbs water and transfers the water to the soil layer, so that automatic water supply is realized; the irrigation tank 21 is internally provided with a control switch assembly 22, a buoyancy piece 222 in the control switch assembly 22 can lift according to the change of the water level, when the water level is lowered, the buoyancy piece 222 drives a tilting part 214 of a movable plate 212 to tilt, a drainage channel 40 is formed between the movable plate 212 and the bottom of a baffle 231, when the buoyancy piece 222 descends until a second contact switch 27 is triggered, the second contact switch 27 turns on a water pump 25 and an electromagnetic valve 29, rainwater in the water collection tank 11 is conveyed into the irrigation tank 21, and impurities on the movable plate 212 are flushed into a drainage pipe 28 and simultaneously automatically store water in the irrigation tank 21; when the water level rises until the first contact switch 26 is triggered, the movable plate 212 is restored to the flat state, the baffle 231 tightly blocks the pipe orifice of the sewage pipe 28, the first contact switch 26 closes the water pump 25 and the electromagnetic valve 29, and water storage is stopped, so that automatic water storage and irrigation of the rainwater collection system are realized.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A building roof rainwater recovery system, comprising:

the rainwater collecting device (10) is arranged on a building, a greening tank (30) is arranged on the building, and the rainwater collecting device (10) comprises a water collecting tank (11) for storing water and irrigating;

the irrigation device (20) comprises an irrigation box (21) and a control switch assembly (22) arranged in the irrigation box (21), the irrigation box (21) is arranged outside the greening box (30), water diversion cotton (211) is arranged in a soil layer (32) of the greening box (30), and the water diversion cotton (211) extends downwards into the irrigation box (21) for water absorption;

be provided with raceway (24) between header tank (11) and irrigation tank (21), be provided with water pump (25) on raceway (24), control switch subassembly (22) are used for according to the depth of irrigation tank (21) water level in with the control the break-make of water pump (25), so that raceway (24) with the collection water conservancy diversion in header tank (11) extremely in irrigation tank (21).

2. The building roof rainwater recovery system according to claim 1, wherein the control switch assembly (22) comprises a limiting rod (221) and a buoyancy piece (222), the limiting rod (221) is fixedly arranged in the irrigation tank (21) along a vertical direction, the buoyancy piece (222) is slidably arranged on the limiting rod (221), the buoyancy piece (222) is provided with a floating inner cavity so that the buoyancy piece (222) floats up and down along with the water level, a first contact switch (26) is arranged at the top end of the limiting rod (221), a limiting ring (223) is fixedly connected to the bottom end of the limiting rod (221), and a second contact switch (27) is arranged on the limiting ring (223);

the first contact switch (26) and the second contact switch (27) are both electrically connected with the water pump (25), when the buoyancy piece (222) moves downwards along with the water level to trigger the second contact switch (27), the second contact switch (27) controls the water pump (25) to be switched on, and when the buoyancy piece (222) moves upwards along with the water level to trigger the first contact switch (26), the first contact switch (26) controls the water pump (25) to be switched off.

3. The building roof rainwater recovery system according to claim 2, characterized in that a drain pipe (28) is communicated with the irrigation tank (21), a water inlet end of the drain pipe (28) is arranged opposite to a water outlet end of the water pipe (24), and the drain pipe (28) and the water pipe (24) are both arranged at the bottom of the irrigation tank (21);

a movable plate (212) is arranged in the irrigation box (21), the central position of the movable plate (212) is fixedly connected with the bottom wall of the irrigation box (21) to form a fixed part (213), the extending direction of the fixed part (213) points to the pipe orifices of the sewage discharge pipe (28) and the water conveying pipe (24), and the movable plate (212) forms tilting parts (214) on two sides with the fixed part (213) as a symmetry axis;

a pulling rope (225) is connected between the buoyancy piece (222) and the edge position of the movable plate (212), and when the buoyancy piece moves upwards, the tilting part (214) tilts through the pulling rope (225).

4. A roof rainwater recovery system for buildings according to claim 3 characterized in that a pulley (224) is arranged in the irrigation tank (21), the pulling rope (225) is wound on the pulley (224), two pulleys (224) and two pulling ropes (225) are arranged, and two pulleys (224) are symmetrically arranged at two sides of the buoyancy member (222) to make the pulling force of the two pulling ropes (225) same.

5. The building roof rainwater recovery system according to claim 3, further comprising a drain gate assembly (23), wherein the drain gate assembly (23) comprises a baffle plate (231) slidably arranged in the irrigation tank (21) along the vertical direction, the baffle plate (231) is square, and the baffle plate (231) is arranged on one side close to the water inlet end of the sewage pipe (28);

under the horizontal state of the movable plate (212), the bottom surface of the baffle (231) is attached to the movable plate (212) to block the water inlet end of the sewage pipe (28), when the two sides of the movable plate (212) are tilted, the tilted part (214) pushes the baffle (231) to move upwards, so that the movable plate (212) and the bottom surface of the baffle (231) generate a drainage channel (40) for water to pass through, and sewage is convenient to drain.

6. The system for recovering rainwater from the roof of a building according to claim 5, wherein the cross-sectional area of the nozzle of the water pipe (24) is larger than the cross-sectional area of the drain channel (40) at the maximum.

7. The building roof rainwater recycling system according to claim 5, characterized in that an electromagnetic valve (29) is arranged on the sewage draining pipe (28), the electromagnetic valve (29) is electrically connected with the first contact switch (26) and the second contact switch (27), and the electromagnetic valve (29) is synchronously switched on and off with the water pump (25).

8. The building roof rainwater recovery system according to claim 3, characterized in that the control switch assemblies (22) are arranged in two groups, one group of control switch assemblies (22) is arranged near the water delivery pipe (24), and the other group of control switch assemblies (22) is arranged near the sewage discharge pipe (28).

9. The building roof rainwater recovery system according to claim 3, characterised in that the edge of said movable plate (212) is in abutment with the inner wall of said irrigation tank (21).

10. The building roof rainwater recovery system according to claim 5,

the buoyancy piece (222) is a hollow iron ball;

or/and a limiting slide rod (233) is arranged in the irrigation box (21) and clings to the sewage discharge pipe (28), and the baffle (231) is connected with the limiting slide rod (233) in a sliding manner.