CN215962537U - Rainwater purification and greening system for artificial waterscape in cold and arid regions - Google Patents

Abstract

The application provides a rainwater purification and greening system for artificial waterscape in cold and arid regions, and belongs to the technical field of rainwater resource utilization. This rainwater purifies afforestation system for artificial waterscape in frigid and arid district, including collecting purification mechanism and artificial waterscape mechanism, it collects the component including level ground, roof to collect purification mechanism, sand setting jar, cistern and greenery patches, artificial waterscape mechanism includes drop weir, outlet pipe, water pump, buffering well, drop view and backflow filtration pond, collects the component through the roof and carries out preliminary purification treatment with the rainwater after will infiltrating through the greenery patches, and in the cistern of impressing, carry out abundant precipitation purification treatment to the rainwater through water quality purification layer, through the setting of water pump, outlet pipe and buffering well, make the rainwater in the cistern evenly flow into the drop view, finally flow back into in the cistern through backflow filtration pond to realize abundant carrying out purification treatment to the rainwater and apply to artificial waterscape and afforestation water.

Description

Rainwater purification and greening system for artificial waterscape in cold and arid regions

Technical Field

The application relates to the field of rainwater resource utilization, in particular to a rainwater purification and greening system for artificial waterscape in cold and arid regions.

Background

The cold and dry areas have rare annual precipitation, obvious difference of space-time distribution, strong evaporation, less surface runoff in the areas, deficient underground water resources, obvious shortage of total water resources and prominent water shortage problem. Therefore, more and more attention is paid to rainwater utilization of natural water resources, the rainwater resources can realize water recycling and reutilization through the rainwater collection and storage system, and the rainwater collection and storage system is an effective measure for saving water, lightening urban flood disasters, relieving drainage pipeline burden, reducing pollution load and improving water environment state.

The conventional rainwater utilization scheme is that rainwater is concentrated and collected and then is filtered, then is used for afforestation and waterscape water, when carrying out rainwater utilization as independent district, and roof rainwater is collected and greenbelt rainwater collects the pipeline bending region of back catchment and easily gathers debris and make the pipeline block up, and then influences rainwater collection effect, and most rainwater can be extravagant because of the evaporation, and the rainwater can not obtain more effective and reasonable utilization.

SUMMERY OF THE UTILITY MODEL

In order to make up for the above deficiencies, the application provides a rainwater purification and greening system for artificial waterscape in cold and arid regions, which aims to solve the problems in the background art.

The embodiment of the application provides a rainwater purifies afforestation system for artificial waterscape in frigid and arid region, including collecting purification mechanism and artificial waterscape mechanism.

Collect purification mechanism and collect component, sand setting tank, cistern and greenery patches including level ground, roof, the building has been built to level ground one side, the component set up in the building top is collected to the roof, the sand setting tank bury underground in building one side the level ground is interior, the component is collected through the roof pass through the drain pipe with the sand setting tank intercommunication, the cistern bury underground in the level ground, the sand setting tank pass through the raceway with the cistern intercommunication, the greenery patches is collected the component and is inlayed and locate in the cistern top, the bottom is provided with water purification layer in the cistern.

Artificial waterscape mechanism includes drop weir, outlet pipe, water pump, buffering well, drop view and backward flow filtering ponds, the drop weir set up in level ground is kept away from one side of building, the outlet pipe bury underground in the drop weir, outlet pipe one end is run through and is extended into in the cistern, the water pump install in the outlet pipe stretches into the end, the buffering well set up in drop weir top, the outlet pipe other end intercommunication set up in buffering well top, the drop view set up in on the drop weir inclined plane, backward flow filtering ponds bury underground in drop view bottom in the drop weir, just backward flow filtering ponds with the cistern intercommunication.

In the implementation process, in rainy days, the infiltrated rainwater is subjected to primary purification treatment through the roof collecting component, is discharged into the sand setting tank through the water discharge pipe to be precipitated and remove silt in the rainwater, and is discharged into the water storage tank through the water delivery pipe, so that the primarily filtered roof rainwater cannot block the pipeline, and the maintenance is more convenient; meanwhile, the green land collection component preliminarily purifies the infiltrated redundant rainwater and then directly falls into the reservoir, and extra pipelines for gathering and guiding are not needed to be arranged, so that the greening water consumption is large, the structural design is favorable for quickly and effectively recovering the rainwater or the treated water, and the recovery effect and the recovery efficiency are better; carry out abundant precipitation purification treatment to the rainwater that flows into in the cistern through quality of water purification layer, the rainwater after purification treatment in the cistern flows into in the buffering well through the outlet pipe by the water pump, the rainwater that the buffering well spills over flows into the drop view evenly, satisfy near sightseeing crowd's sight of watching, the rainwater that the drop view flows down finally flows back into in the cistern after filtration purification once more through the filtration frame in the backward flow filter pond to realize abundant carry out purification treatment to the rainwater and apply to artifical waterscape and afforestation water, rainwater is collected and the utilization efficiency is higher.

In a specific embodiment, the roof collecting member includes water catch bowl, first afforestation soil horizon, first rubble filter layer and drainage fill, first rubble filter layer with first afforestation soil horizon from the bottom up lays in proper order in the water catch bowl, the drainage fill intercommunication set up in one side of water catch bowl bottom, just the drainage fill top is provided with the filtration grid.

In the above-mentioned realization process, carry out preliminary purification treatment with the unnecessary rainwater after will infiltrating through first afforestation soil horizon and first rubble filter layer, the drainage rate of water catch bowl can be accelerated to the drain hopper, and filter grille is used for preventing silt from getting into in the drain hopper.

In a specific embodiment, the green space collecting member comprises a supporting screen and a second greening soil layer, the supporting screen is fixedly connected to the inner wall of the reservoir close to the top, and the second greening soil layer is laid on the top of the supporting screen.

In the implementation process, the second greening soil layer preliminarily purifies the redundant rainwater after infiltration and then falls into the reservoir through the supporting screen plate.

In a specific embodiment, an anti-evaporation layer is laid on the top of each of the first greening soil layer and the second greening soil layer, a fiber cloth is arranged between the first gravel filtering layer and the first greening soil layer, and a fiber cloth is also arranged between the supporting screen plate and the second greening soil layer.

At above-mentioned realization in-process, prevent that the evaporation stratum can prevent that the intraformational moisture of second afforestation soil from being evaporated by the rapidogen, during fibre cloth can prevent that soil from being washed into the metalling by the infiltration rainwater, lead to soil loss.

In a specific embodiment, the grit chamber includes a jar body, apron, second rubble filter layer and sand collection bucket, the apron lid is located jar body top, drain pipe one end is run through the apron extends to the jar is internal, second rubble filter layer lays in the middle part of jar internal wall, sand collection bucket intercommunication set up in jar body bottom, raceway one end communicate in jar body.

In the implementation process, rainwater subjected to primary purification treatment by the roof collecting component is discharged into the sand setting tank to be precipitated to remove silt in the sand setting tank, and meanwhile, the sand setting tank can play a role in buffering and impacting.

In a specific embodiment, the water quality purification layer comprises a coarse sand layer, a zeolite layer and a third gravel filtering layer which are sequentially arranged from top to bottom.

In the implementation process, the rainwater flowing into the water storage tank is fully precipitated and purified through the coarse sand layer, the zeolite layer and the third gravel filtering layer.

In a specific embodiment, a landscape water distribution channel is arranged between the buffer well and the drop landscape, and an overflow pipe is communicated with one side of the landscape water distribution channel, which is close to the drop landscape.

In the implementation process, the arrangement of the landscape water distribution channel and the overflow pipe can enable rainwater overflowing from the buffer well to uniformly flow into the water falling landscape, so that the ornamental value of nearby sightseeing people is met.

In a specific embodiment, a cobble layer is laid at the bottom of the buffer well, and the top of the buffer well is hollowed.

In a specific embodiment, the backflow filtering pond top cover is provided with an access cover, a plurality of through holes are formed in the access cover, a supporting ring block is fixed on the inner wall of the backflow filtering pond, an L-shaped supporting seat is fixed at the bottom in the backflow filtering pond, and the bottom of the backflow filtering pond is communicated with the reservoir through a backflow pipe.

In the above-mentioned realization process, the access cover is convenient for overhaul or clear up, and the setting of support ring piece and L type supporting seat is convenient for fix the filter frame in the backward flow filter pond, and the back flow is convenient for will flow into the rainwater backward flow in the backward flow filter pond from the drop view and go into the cistern to the realization is with the reuse of rainwater.

In a specific implementation scheme, a filter frame is further arranged in the backflow filter tank, filter holes are uniformly formed in the peripheral side wall of the filter frame, a connection ring is fixed to the top of the filter frame, the bottom of the filter frame abuts against the L-shaped support seat, the connection ring abuts against the support ring block, and a handle is further fixed to the connection ring.

In the above-mentioned realization process, when the rainwater flowed into the backward flow filter tank through the through-hole of access cover, filtered the rainwater that flows into the backward flow filter tank through the through-hole of access cover through the filtration pore pair on the filter frame and carries out filtration purification once more, the setting of handle is convenient for take out the filter frame from the backward flow filter tank in and clear up.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort.

FIG. 1 is a schematic structural view of a rainwater purification and greening system for artificial waterscape in cold and dry areas according to an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a collection and purification mechanism provided in an embodiment of the present application;

FIG. 3 is a schematic structural view of a roof collection element according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a sand settling tank provided in an embodiment of the present application;

fig. 5 is a schematic view of a water reservoir structure provided in an embodiment of the present application;

FIG. 6 is a schematic structural diagram of an artificial waterscape mechanism according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a backflow filtration tank provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of a filter frame according to an embodiment of the present application.

In the figure: 10-a collection and purification mechanism; 110-horizontal ground; 120-a building; 121-a drain pipe; 130-a roof collection member; 131-a water collecting tank; 132-a first green soil layer; 133-a first rubble filter layer; 134-a drain hopper; 1341-a filter grid; 140-a sand setting tank; 141-a tank body; 142-a cover plate; 143-a second gravel pack; 144-a sand collection hopper; 150-a water reservoir; 160-green land collection member; 161-supporting the mesh plate; 162-a second green soil layer; 170-water purifying layer; 171-coarse sand layer; 172-zeolite layer; 173-a third gravel filter layer; 180-water conveying pipe; 20-artificial waterscape mechanism; 210-a water drop weir; 220-water outlet pipe; 230-a water pump; 240-buffer well; 241-cobblestone layer; 250-landscape water distribution channels; 251-an overflow pipe; 260-drop landscape; 270-a reflux filtration tank; 271-access cover; 272-support ring blocks; 273-L shaped support seat; 274-a return pipe; 280-a filter frame; 281-filtration pores; 282-a connecting ring; 283-handle.

Detailed Description

The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application are within the scope of protection of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus should not be considered limiting.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1-8, the present application provides a rainwater purification and greening system for artificial waterscape in cold and arid regions, which includes a collecting and purifying mechanism 10 and an artificial waterscape mechanism 20.

Referring to fig. 2, 3, 4 and 5, the collecting and purifying mechanism 10 includes a horizontal ground 110, a roof collecting member 130, a sand settling tank 140, a water reservoir 150 and a green land collecting member 160, a building 120 is built on one side of the horizontal ground 110, the roof collecting member 130 is disposed on the top of the building 120, when the collecting mechanism is specifically disposed, the roof collecting member 130 includes a water collecting tank 131, a first green soil layer 132, a first gravel filter layer 133 and a water drain bucket 134, the first gravel filter layer 133 and the first green soil layer 132 are sequentially laid in the water collecting tank 131 from bottom to top, in rainy days, rainwater falls into the water collecting tank 131 on the top of the building 120, the first green soil layer 132 and the first gravel filter layer 133 primarily purify the excessive rainwater after infiltration, the water drain bucket 134 is disposed on one side of the bottom of the water collecting tank 131, a filtering grid 1341 is disposed on the top of the water drain bucket 134, the water drain bucket 134 can accelerate the water drainage speed of the water collecting tank 131, the filter screen 1341 serves to prevent silt from entering the drain hopper 134.

In this embodiment, the sand setting tank 140 is buried in the horizontal ground 110 on one side of the building 120, the roof collecting member 130 is communicated with the sand setting tank 140 through the drain pipe 121, the rainwater primarily purified by the roof collecting member 130 is drained into the sand setting tank 140 through the drain hopper 134 and the drain pipe 121 to precipitate and remove the silt therein, and the sand setting tank 140 can play a role of buffering impact, when the concrete arrangement is performed, the sand setting tank 140 comprises a tank body 141, a cover plate 142, a second gravel filtering layer 143 and a sand setting hopper 144, the cover plate 142 is covered on the top of the tank body 141 to prevent the debris from falling into the tank body 141 and causing blockage, one end of the drain pipe 121 penetrates through the cover plate 142 and extends into the tank body 141, the other end of the drain pipe 121 is communicated with the drain hopper 134, the second gravel filtering layer 143 is laid in the middle of the inner wall of the tank body 141 to relieve the impact of the rainwater falling into the tank body 141 through the drain pipe 121, the sand setting hopper 144 is communicated with the bottom of the tank body 141, the sand collecting hopper 144 can retain small particle impurities in rainwater, one end of the water conveying pipe 180 is communicated with the tank body 141, and a water inlet of the water conveying pipe 180 is positioned between the sand collecting hopper 144 and the second gravel filtering layer 143.

In this embodiment, the reservoir 150 is buried in the horizontal ground 110 for storing the collected rainwater, the sand settling tank 140 is communicated with the reservoir 150 through a water pipe 180, the greenbelt collecting member 160 is embedded in the top of the reservoir 150, the water purifying layer 170 is disposed at the bottom of the reservoir 150, specifically, the water purifying layer 170 comprises a coarse sand layer 171, a zeolite layer 172 and a third gravel filtering layer 173 sequentially disposed from top to bottom, and the rainwater flowing into the reservoir 150 is sufficiently precipitated and purified through the coarse sand layer 171, the zeolite layer 172 and the third gravel filtering layer 173.

In this embodiment, the green land collecting member 160 includes a supporting mesh plate 161 and a second greening soil layer 162, the supporting mesh plate 161 is fixedly connected to the inner wall of the reservoir 150 near the top, the supporting mesh plate 161 is bolted or welded to the reservoir 150, the second greening soil layer 162 is laid on the top of the supporting mesh plate 161, the second greening soil layer 162 primarily purifies the excess rainwater infiltrated and then falls into the reservoir 150 through the supporting mesh plate 161, an evaporation prevention layer is laid on the top of each of the first greening soil layer 132 and the second greening soil layer 162 to prevent the moisture in the second greening soil layer 162 from being rapidly evaporated, a fiber cloth is arranged between the first gravel filter layer 133 and the first greening soil layer 132, a fiber cloth is also arranged between the supporting mesh plate 161 and the second greening soil layer 162, and can prevent the soil from being washed into the gravel layer by the infiltrated rainwater, thereby causing soil loss.

Referring to fig. 6, the artificial waterscape mechanism 20 includes a drop weir 210, a water outlet pipe 220, a water pump 230, a buffer well 240, a drop landscape 260 and a backflow filtering pool 270, the drop weir 210 is disposed on one side of the horizontal ground 110 far from the building 120, the water outlet pipe 220 is embedded in the drop weir 210, one end of the water outlet pipe 220 extends into the water reservoir 150, the water pump 230 is mounted at the extending end of the water outlet pipe 220, the buffer well 240 is disposed at the top of the drop weir 210, a cobble layer 241 is laid at the bottom of the buffer well 240, the cobble layer 241 can perform a filtering function and can effectively filter impurities therein, the top of the buffer well 240 is hollowed out, the other end of the water outlet pipe 220 is communicated with the top of the buffer well 240, the drop landscape 260 is disposed on the inclined surface of the drop weir 210, a landscape channel 250 is disposed between the buffer well 240 and the drop landscape 260, the landscape channel 250 can enable rainwater overflowing from the buffer well 240 to uniformly flow into the drop landscape 260, one side of the landscape water distribution channel 250, which is close to the drop landscape 260, is communicated with an overflow pipe 251, the overflow pipes 251 are uniformly arranged in a row, rainwater in the landscape water distribution channel 250 is uniformly introduced into the drop landscape 260 through the overflow pipes 251, and the drop landscape 260 adopts a multistage stepped drop design, so that the appreciation of nearby sightseeing people can be met.

Referring to fig. 6, 7 and 8, the backflow filtering tank 270 is embedded in the drop weir 210 at the bottom of the drop landscape 260, and the backflow filtering tank 270 is communicated with the water reservoir 150, specifically, the top of the backflow filtering tank 270 is covered with an access cover 271 for easy opening for maintenance or cleaning, the access cover 271 is provided with a plurality of through holes, the inner wall of the backflow filtering tank 270 is fixed with a support ring block 272, the support ring block 272 is bolted or welded to the backflow filtering tank 270, the bottom of the backflow filtering tank 270 is fixed with an L-shaped support seat 273, the bottom of the backflow filtering tank 270 is communicated with the water reservoir 150 through a backflow pipe 274, so as to facilitate the rainwater flowing from the drop landscape 260 into the backflow filtering tank 270 to flow back into the water reservoir 150, thereby realizing the repeated recycling of the rainwater, the backflow filtering tank 270 is further provided with a filtering frame 280, the filtering holes 281 are uniformly formed on the peripheral side wall of the filtering frame 280, and when the rainwater flows into the backflow filtering tank 270 through the through holes of the access cover 271, the rainwater flowing out of the drop landscape 260 is filtered by the filter holes 281 on the filter frame 280 and then flows into the water reservoir 150 through the return pipe 274, so that the rainwater is filtered and purified again, the connecting ring 282 is fixed at the top of the filter frame 280, the connecting ring 282 and the filter frame 280 are integrally formed, the bottom of the filter frame 280 abuts against the L-shaped supporting seat 273, the connecting ring 282 abuts against the supporting ring block 272, the filter frame 280 is fixed in the backflow filter tank 270 through the matching of the connecting ring 282, the supporting ring block 272 and the L-shaped supporting seat 273, and the handle 283 is further fixed on the connecting ring 282, so that the filter frame 280 can be conveniently taken out from the backflow filter tank 270 for cleaning.

The working principle of the rainwater purification and greening system for the artificial waterscape in the cold and arid regions is as follows: in rainy days, rainwater falls into a water collecting tank 131 at the top of the building 120, the rainwater after the primary purification treatment is subjected to primary purification treatment through a first green soil layer 132 and a first gravel filtering layer 133, the rainwater after the primary purification treatment is discharged into a sand setting tank 140 through a water discharge hopper 134 and a water discharge pipe 121 to be precipitated and remove silt in the rainwater, and then the rainwater is discharged into a reservoir 150 through a water conveying pipe 180, so that the structural design is convenient to overhaul, the blockage caused by accumulation of impurities in pipelines can be avoided, meanwhile, redundant rainwater after the infiltration is subjected to primary purification by a greenbelt collecting member 160 and then falls into the reservoir 150, the rainwater flowing into the reservoir 150 is subjected to full precipitation purification treatment through a coarse sand layer 171, a zeolite layer 172 and a third gravel filtering layer 173, and the structural design of directly combining the greenbelt collecting member 160 and the reservoir 150 can improve the rainwater collecting efficiency without arranging pipelines; the water pump 230 pumps the purified rainwater in the reservoir 150 and flows into the buffer well 240 through the water outlet pipe 220, the rainwater overflowing from the buffer well 240 uniformly flows into the drop landscape 260 through the landscape water distribution channel 250 to meet the appreciation of nearby sightseeing people, and the rainwater flowing down from the drop landscape 260 finally flows back into the reservoir 150 after being filtered and purified again through the filter frame 280 in the backflow filter tank 270, so that the rainwater is fully purified and applied to artificial waterscape and greening water.

It should be noted that the specific model specification of the water pump 230 needs to be determined by model selection according to the actual specification of the device, and the specific model selection calculation method adopts the prior art in the field, so detailed description is omitted.

The power supply of the water pump 230 and its principle will be clear to a person skilled in the art and will not be described in detail here.

The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A rainwater purification and greening system for artificial waterscape in cold and arid regions is characterized by comprising

A collecting and purifying mechanism (10), the collecting and purifying mechanism (10) comprising a horizontal ground (110), a roof collecting member (130), a sand settling tank (140), a water reservoir (150) and a greenbelt collecting member (160), a building (120) is built on one side of the horizontal ground (110), the roof collecting member (130) is arranged on the top of the building (120), the sand settling tank (140) is buried in the horizontal ground (110) on one side of the building (120), the roof collection member (130) is communicated with the grit chamber (140) through a drain pipe (121), the reservoir (150) is buried in the horizontal ground (110), the grit chamber (140) is communicated with the reservoir (150) through a water pipe (180), the green space collecting component (160) is embedded in the top of the water storage tank (150), and a water quality purifying layer (170) is arranged at the bottom in the water storage tank (150);

artificial waterscape mechanism (20), artificial waterscape mechanism (20) is including falling weir (210), outlet pipe (220), water pump (230), buffering well (240), drop view (260) and backward flow filtering ponds (270), drop weir (210) set up in horizontal ground (110) is kept away from one side of building (120), outlet pipe (220) bury underground in drop weir (210), outlet pipe (220) one end runs through and extends into in cistern (150), water pump (230) install in outlet pipe (220) stretches into the end, buffering well (240) set up in drop weir (210) top, outlet pipe (220) other end intercommunication set up in buffering well (240) top, drop view (260) set up in drop weir (210) inclined plane, backward flow filtering ponds (270) in drop weir (210) of view (260) bottom, and the return filtering tank (270) is communicated with the water storage tank (150).

2. A rainwater purification and greening system for artificial waterscape in cold and arid regions according to claim 1, wherein said roof collecting member (130) comprises a water collecting tank (131), a first greening soil layer (132), a first gravel filtering layer (133) and a drainage hopper (134), said first gravel filtering layer (133) and said first greening soil layer (132) are laid in said water collecting tank (131) from bottom to top in turn, said drainage hopper (134) is connected to one side of the bottom of said water collecting tank (131), and a filtering grid (1341) is arranged on the top of said drainage hopper (134).

3. A rainwater purification and greening system for artificial waterscape in cold and arid regions according to claim 2, wherein said green land collecting member (160) comprises a supporting screen (161) and a second greening soil layer (162), said supporting screen (161) is fixedly connected to the inner wall of said water reservoir (150) near the top, said second greening soil layer (162) is laid on the top of said supporting screen (161).

4. A rainwater purification and greening system for artificial waterscape in cold and dry area as claimed in claim 3, wherein an evaporation-proof layer is laid on top of each of said first greening soil layer (132) and said second greening soil layer (162), a fiber cloth is arranged between said first gravel filtering layer (133) and said first greening soil layer (132), and a fiber cloth is also arranged between said supporting net plate (161) and said second greening soil layer (162).

5. A rainwater purification and greening system for artificial waterscape in cold and arid regions according to claim 1, wherein the sand setting tank (140) comprises a tank body (141), a cover plate (142), a second gravel filter layer (143) and a sand collection hopper (144), the cover plate (142) is covered on the top of the tank body (141), one end of the drain pipe (121) penetrates through the cover plate (142) and extends into the tank body (141), the second gravel filter layer (143) is laid in the middle of the inner wall of the tank body (141), the sand collection hopper (144) is communicated with the bottom of the tank body (141), and one end of the water delivery pipe (180) is communicated with the tank body (141).

6. The rainwater purification and greening system for artificial waterscape in cold and dry area as claimed in claim 1, wherein the water quality purification layer (170) comprises a coarse sand layer (171), a zeolite layer (172) and a third gravel filter layer (173) sequentially arranged from top to bottom.

7. The rainwater purification and greening system for the artificial water scenery in the cold and arid regions as claimed in claim 1, wherein a landscape water distribution channel (250) is arranged between the buffer well (240) and the water drop landscape (260), and an overflow pipe (251) is communicated with one side of the landscape water distribution channel (250) close to the water drop landscape (260).

8. A rainwater purification and greening system for artificial water scenery in cold and arid regions according to claim 1, wherein a cobble layer (241) is laid on the bottom in the buffer well (240), and the top of the buffer well (240) is hollowed out.

9. A rainwater purification and greening system for artificial waterscape in cold and arid regions according to claim 1, wherein an access cover (271) is covered on the top of the return filtering tank (270), a plurality of through holes are formed on the access cover (271), a supporting ring block (272) is fixed on the inner wall of the return filtering tank (270), an L-shaped supporting seat (273) is fixed on the bottom of the return filtering tank (270), and the bottom of the return filtering tank (270) is communicated with the reservoir (150) through a return pipe (274).

10. The rainwater purification and greening system for artificial waterscape in cold and arid regions according to claim 9, wherein a filter frame (280) is further arranged in the return filter tank (270), filter holes (281) are uniformly formed in the peripheral side wall of the filter frame (280), a connecting ring (282) is fixed at the top of the filter frame (280), the bottom of the filter frame (280) abuts against the L-shaped supporting seat (273), the connecting ring (282) abuts against the supporting ring block (272), and a handle (283) is further fixed on the connecting ring (282).

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