CN107724507A - A kind of gutter inlet device - Google Patents
A kind of gutter inlet device Download PDFInfo
- Publication number
- CN107724507A CN107724507A CN201711085848.9A CN201711085848A CN107724507A CN 107724507 A CN107724507 A CN 107724507A CN 201711085848 A CN201711085848 A CN 201711085848A CN 107724507 A CN107724507 A CN 107724507A
- Authority
- CN
- China
- Prior art keywords
- drainage trough
- inlet device
- casing
- rainwater
- gutter inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/0401—Gullies for use in roads or pavements
- E03F5/0404—Gullies for use in roads or pavements with a permanent or temporary filtering device; Filtering devices specially adapted therefor
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
- E03F5/042—Arrangements of means against overflow of water, backing-up from the drain
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F2201/00—Details, devices or methods not otherwise provided for
- E03F2201/10—Dividing the first rain flush out of the stormwater flow
Abstract
The present invention relates to rainwater treatment field, discloses a kind of gutter inlet device, including casing, drainage trough, rain perforaled strainer, overflow baffle, filtering medium layer and storm sewer；Rain perforaled strainer is located at the top of casing, drainage trough is provided with casing and below rain perforaled strainer, drainage trough downward vertical is provided with overflow baffle, casing is divided into rainwater storage filtering area and catchment by overflow baffle, the bottom of rainwater storage filtering area is equipped with filtering medium layer, and the end of drainage trough is located at the top of rainwater storage filtering area, and the bottom of overflow baffle is provided with permeable hole, for connecting rainwater storage filtering area and catchment, catchment is provided with storm sewer.The gutter inlet device of the present invention can effectively control medium and small rainfall and Initial Runoff to pollute；With early-stage rainwater storage area；It is convenient that early-stage rainwater filter packing is changed, and the operation maintenance of inlet for stom water later stage requires low, and excessively stream rainwater can be provided with overflow ducts between drainage trough and the overflow baffle and discharge.
Description
Technical field
The present invention relates to rainwater treatment field, more particularly to a kind of gutter inlet device.
Background technology
In recent years, early-stage rainwater pollution problem at home and abroad receives extensive concern.Because rainfall runoff containing plurality of heavy metal,
The polluters such as organic matter, nutritive salt, suspended particulate substance, such as without effective processing, river course is directly discharged into through storm sewer, must
Urban Water Environment will be caused seriously to pollute.Therefore, it is very necessary for city initial rainwater being controlled.
China is inadequate to city initial rainwater footpath flow control attention degree, is currently limited to use just part Roof Runoff
Phase rainwater flow-discarding device, the early-stage rainwater stream abandoning of separation are handled to municipal wastewater pipeline system into sewage plant.It is but right
Controlled in road rain water runoff pollution and lack effective measures.According to existing sewerage system design method, road rain water runoff
By earth's surface functional in organized water drainage to inlet for stom water, municipal Stormwater Drainage System is emitted into by branch drain, is finally directly discharged to
City receiving water body.Numerous studies show that pollutant first flush phenomenon is obvious in all kinds of city underlying surface runoffs, into row
After water pipe canal system system, influenceed by many factors such as drainage pipeline topological structure, concentration time, pipeline deposits, drainage system
The first flush phenomenon for going out stream is not notable.Therefore for urban runoff contamination control, especially early-stage rainwater contamination control, more exist
" source " effect is better.For urban road drainage system, carrying out early-stage rainwater control in inlet for stom water has higher take
Ratio is imitated, effect is more preferable.
Traditional design of gully does not consider Urban Rainwater Runoff Pollution control.With to road rain water runoff pollution control
The attention of system, there is multinomial inlet for stom water contamination control patent to disclose or authorize at present.Wherein, a kind of inlet for stom water efficiently cuts dirty dress
To put, patent No. CN201410029089.4, the efficient pollution cutting device of inlet for stom water that the patent provides cuts dirty net by pollution cutting device,
The pollutant that leaf, the scraps of paper, cigarette end etc. enter inlet for stom water can be retained, prevents the blocking of inlet for stom water and pipeline；Pass through device surrounding
The filtrate of headspace filling, removes the particulate matter in early-stage rainwater runoff；When run-off is larger, rainwater can be without filter material layer
Catch-basin bottom space is directly entered by screen pack.The patent of invention is cutting dirty net week side setting filtrate, but limited by the structure,
Its filtrate thickness is smaller, determines that its filtrate saturation time is short, and device usage time and replacement cycle are short, while this sets
Put mode its filter material replacement inconvenience；Device overfall, which is arranged at, cuts dirt on the net, is limited by conveyance capacity, possibly can not ensure rainwater
Mouth design conveyance capacity, influence region drainage waterlogging prevention safety.
Disclose or authorized at present inlet for stom water to cut dirty or pollution control technology, device, structure, certain journey can be achieved mostly
Contamination control effect on degree, but following one or more of problems be present：1) only controllable bulky grain or single type pollutant, mistake
It is poor to filter effect；2) without early-stage rainwater storage area；3) the problems such as operation maintenance inconvenience；4) inlet for stom water excessively stream energy can not be effectively ensured
Power.
The content of the invention
(1) technical problems to be solved
It is an object of the invention to provide a kind of gutter inlet device, solves Rainwater Initial processing filter effect in the prior art
Difference；Without early-stage rainwater storage area；Operation maintenance inconvenience；Excessively stream rainwater timely and effective can not be discharged, and cause to install pollution cutting device
Afterwards, the actual conveyance capacity of inlet for stom water does not reach its design drainability.
(2) technical scheme
In order to solve the above-mentioned technical problem, the present invention provides a kind of gutter inlet device, it is characterised in that including casing, draws
Chute, rain perforaled strainer, overflow baffle, filtering medium layer and storm sewer；Wherein, the rain perforaled strainer is located at the top of the casing
Portion, is provided with drainage trough in the casing and below the rain perforaled strainer, and the drainage trough downward vertical is provided with described overflow
Baffle plate is flowed, the casing is divided into rainwater storage filtering area and catchment, the rainwater storage filtering area by the overflow baffle
Bottom be equipped with filtering medium layer, the end of the drainage trough is located at the top of the rainwater storage filtering area, the overflow
The bottom of baffle plate is provided with permeable hole, and for connecting the rainwater storage filtering area and the catchment, the catchment is provided with rain
Waterpipe, overflow ducts are provided between the drainage trough and the overflow baffle.
Wherein, the drainage trough is set along the box inside wall.
Wherein, the drainage trough is " U " font.
Wherein, in addition to deck, the deck is on the box inside wall, for fixing the drainage trough.
Wherein, the aperture of the permeable hole is less than the minimum grain size of the filtering medium layer.
Wherein, the end of the drainage trough extends downwardly.
Wherein, the material of the drainage trough is stainless steel, cast iron, high density polyethylene (HDPE), aluminium alloy or titanium alloy.
Wherein, the material of the filtering medium layer is cobble, quartz sand, activated carbon, zeolite or mixed fillers.
Wherein, the permeable hole is shaped as circular, square, rhombus, triangle, rectangle or trapezoidal.
(3) beneficial effect
A kind of gutter inlet device provided by the invention, rainfall initial stage, early-stage rainwater flow into rain perforaled strainer by surface runoff,
Rainwater storage filtering area is imported by drainage trough, early-stage rainwater runoff passes through filter medium by collecting in rainwater storage filtering area
The processing at initial stage of layer, storm sewer is discharged into by the permeable hole of overflow baffle bottom.The gutter inlet device of the present invention can be controlled effectively
Make medium and small rainfall and Initial Runoff pollution；With early-stage rainwater storage area；It is convenient that early-stage rainwater filter packing is changed, inlet for stom water
Later stage operation maintenance requires low, and excessively stream rainwater can be provided with overflow ducts between drainage trough and the overflow baffle and discharge, and protect
Card rainwater conveyance capacity meets that it designs drainability etc. and required.
Brief description of the drawings
Fig. 1 is a kind of top view of gutter inlet device of the present invention；
Fig. 2 is a kind of plan of gutter inlet device of the present invention；
Fig. 3 is a kind of A-A sectional views of gutter inlet device of the present invention；
Fig. 4 is a kind of B-B sectional views of gutter inlet device of the present invention；
Fig. 5 is schematic diagram when a kind of gutter inlet device of the present invention is run.
In figure, 1, storm sewer；2nd, rain perforaled strainer；3rd, kerbstone；4th, deck；5th, casing；6th, concrete foundation；7th, drain
Groove；8th, overflow baffle；9th, permeable hole；10th, filtering medium layer.
Embodiment
With reference to the accompanying drawings and examples, the embodiment of the present invention is described in further detail.Following instance
For illustrating the present invention, but it is not limited to the scope of the present invention.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4 and Fig. 5, the present invention discloses a kind of gutter inlet device, including casing 5, drainage trough
7th, rain perforaled strainer 2, overflow baffle 8, filtering medium layer 10 and storm sewer 1；Wherein, rain perforaled strainer 2 is located at the top of casing 5,
Drainage trough 7 is provided with casing 5 and below rain perforaled strainer 2, the downward vertical of drainage trough 7 is provided with overflow baffle 8, overflow baffle
Casing 5 is divided into rainwater storage filtering area and catchment by 8, and the bottom of rainwater storage filtering area is equipped with filtering medium layer 10,
The end of drainage trough 7 is located at the top of rainwater storage filtering area, and the bottom of overflow baffle 8 is provided with permeable hole 9, for connecting rainwater
Storage filtering area and catchment, catchment are provided with storm sewer 1, overflow ducts, shape are provided between drainage trough 7 and overflow baffle 8
Into downflow weir.When Rainwater Initial or seldom ponding, the now particulate form pollutant in rainwater, dissolved pollutant or other pollutions
Thing content is more, it is necessary to be filtered；The rainfall later stage, Rainfall runoff increase, because rain water pollutant content reduces, therefore can be without
The water level rise that processing is directly discharged into storm sewer 1, i.e. rainwater storage filtering area is crossed, when water level reaches height of weir plate, is overflow
Flow to storm sewer 1 and import municipal rain-water drainage area..
Specifically, the week side of boss at the top of casing 5 is provided with kerbstone 3, the bottom of casing 5 laying concrete foundation 6, the material of casing 5 is
Brick cement sand plaster or metal or other materials, casing provide support and protection for whole device, ensure whole device
Working environment.The material of rain perforaled strainer 2 is cast iron, stainless steel or concrete, and it is miscellaneous that rain perforaled strainer 2 can retain some larger rubbish
Thing.The material of overflow baffle 8 is stainless steel, concrete, high density polyethylene (HDPE), aluminium alloy or titanium alloy, overflow baffle 8 and casing
The inner space that 5 walls are formed is installed by easily changeable filtering medium layer 10.The inner space is rainwater storage filtering area, and its top is
Early-stage rainwater storage area, bottom are filtering area.Storm sewer 1 is communicated to municipal rain-water drainage area.
The gutter inlet device of the present invention can effectively control medium and small rainfall and Initial Runoff to pollute；Early-stage rainwater filter packing is more
Change conveniently, the operation maintenance of inlet for stom water later stage requires low, and excessively stream rainwater can be provided between drainage trough and the overflow baffle to overflow
Circulation road is discharged, and effectively alleviates the problem of excessively stream rainwater can not discharge in time.
The course of work of the present apparatus at rainfall initial stage：As shown in figure 5, rainfall initial stage, early-stage rainwater pass through surface runoff stream
Enter rain perforaled strainer 2, rainwater storage filtering area is imported by drainage trough 7, early-stage rainwater runoff filters by collecting in rainwater storage
The processing at initial stage of the filtered dielectric layer 10 in area, storm sewer is discharged into by the permeable hole of overflow baffle bottom.Rainfall later stage, rainwater
Run-off increases, and the water level rise of rainwater storage filtering area, when water level reaches height of weir plate, overflows to storm sewer 1 and converges
Enter municipal rain-water drainage area, effectively alleviate the problem of excessively stream rainwater can not discharge in time.The filter medium of rainwater storage filtering area
Layer 10 can targetedly select particular filter filler or filler combination according to the runoff pollution feature of inlet for stom water region, real
Now to the control of specific pollutants, strengthen filter effect.After plant running certain time, filtering medium layer 10 tends to saturation,
Rain perforaled strainer 2 can be opened, removes drainage trough 7, the top layer filler or whole fillers to filtering medium layer 10 carry out replacing maintenance, protect
The subsequent normal operation of card device, it is easy to run and safeguards.
As shown in figure 5, wherein, drainage trough 7 is set along the madial wall of casing 5.Preferably, drainage trough 7 is " U " font.Because
When Rainwater Initial or seldom ponding, early-stage rainwater imports drainage trough 7 by surface runoff from the surrounding of rain perforaled strainer 2.Will drainage
Groove 7 is designed as " U " font, and intermediate portion is divided into hollow, and when Rainwater Initial or seldom ponding, most of rainwater imports drainage trough
7, it is drained to the filtering of rainwater storage filtering area；As Rainfall runoff increases, the rise of the water level of rainwater storage filtering area, first when
When water level reaches height of weir plate, overflow to storm sewer 1 and import municipal rain-water drainage area, then when Rainfall runoff persistently increases
When greatly, more than 7 flow of drainage trough, the lighter rainfall runoff of Final pollution can be without filtering, by " U " font drainage trough 7
Empty part, is directly discharged to storm sewer, realizes the rain water drainage in heavy rain period or rainfall later stage.
Wherein, in addition to deck 4, deck 4 is on the madial wall of casing 5, for fixing drainage trough 7.Specifically, deck is
Integrative-structure, material are stainless steel, aluminium alloy, titanium alloy or composite.
Wherein, the aperture of permeable hole 9 is less than the minimum grain size of filtering medium layer 10.Ensure the filler of filtering medium layer 10 not
Storm sewer can be entered through permeable hole 9.
Wherein, the end of drainage trough 7 extends downwardly, it is easier to the drainage of rainwater.
Wherein, the material of drainage trough 7 is stainless steel, cast iron, high density polyethylene (HDPE), aluminium alloy or titanium alloy.
Wherein, the material of filtering medium layer 10 is cobble, quartz sand, activated carbon, zeolite or its mixed fillers.Specifically,
Its mixed fillers refers to the mixed fillers of two or more media in cobble, quartz sand, activated carbon, zeolite by different ratio,
Also include other media such as clinker, haydite.
Wherein, permeable hole 9 is shaped as circular, square, rhombus, triangle, rectangle or trapezoidal.
The course of work of the present invention at rainfall initial stage and rainfall later stage：As shown in figure 5, rainfall initial stage, early-stage rainwater passes through
Surface runoff flows into rain perforaled strainer 2, imports rainwater storage filtering area by drainage trough 7, early-stage rainwater runoff is by collecting, in rain
The processing at initial stage of the water storage filtered dielectric layer 10 of filtering area, storm sewer is discharged into by the permeable hole of overflow baffle bottom.Drop
In the rain later stage, Rainfall runoff increase, the water level rise of rainwater storage filtering area, when water level reaches height of weir plate, overflow to
Storm sewer 1 imports municipal rain-water drainage area.When Rainfall runoff persistently increases, during more than 7 flow of drainage trough, Final pollution compared with
Light rainfall runoff, by the hollow space of " U " font drainage trough 7, can be directly discharged to storm sewer, realize without filtering
Heavy rain period or the rain water drainage in rainfall later stage.When needing to safeguard, rain perforaled strainer 2 can be opened, removes drainage trough 7, filtering is situated between
The top layer filler or whole fillers of matter layer 10 carry out replacing maintenance, ensure the subsequent normal operation of device.
The gutter inlet device of the present invention can effectively control medium and small rainfall and Initial Runoff to pollute；Stored with early-stage rainwater empty
Between；It is convenient that early-stage rainwater filter packing is changed, and the operation maintenance of inlet for stom water later stage requires low；With excessively stream disposal ability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection with principle.
Claims (9)
1. a kind of gutter inlet device, it is characterised in that including casing (5), drainage trough (7), rain perforaled strainer (2), overflow baffle
(8), filtering medium layer (10) and storm sewer (1)；Wherein, the rain perforaled strainer (2) is located at the top of the casing (5),
Drainage trough (7) is provided with the casing (5) and below the rain perforaled strainer (2), drainage trough (7) downward vertical is provided with
The overflow baffle (8), the casing (5) is divided into rainwater storage filtering area and catchment by the overflow baffle (8), described
The bottom of rainwater storage filtering area is equipped with filtering medium layer (10), and the end of the drainage trough (7) is located at the rainwater storage
The top of filtering area, the bottom of the overflow baffle (8) are provided with permeable hole (9), for connect the rainwater storage filtering area and
The catchment, the catchment are provided with storm sewer (1), are provided with and overflow between the drainage trough (7) and the overflow baffle (8)
Circulation road.
2. gutter inlet device as claimed in claim 1, it is characterised in that the drainage trough (7) is along the casing (5) madial wall
Set.
3. gutter inlet device as claimed in claim 2, it is characterised in that the drainage trough (7) is " U " font.
4. gutter inlet device as claimed in claim 1, it is characterised in that be also located at institute including deck (4), the deck (4)
State on casing (5) madial wall, for fixing the drainage trough (7).
5. gutter inlet device as claimed in claim 1, it is characterised in that the aperture of the permeable hole (9) is less than the filtering
The minimum grain size of dielectric layer (10).
6. gutter inlet device as claimed in claim 1, it is characterised in that the end of the drainage trough (7) extends downwardly.
7. gutter inlet device as claimed in claim 1, it is characterised in that the material of the drainage trough (7) is stainless steel, casting
Iron, high density polyethylene (HDPE), aluminium alloy or titanium alloy.
8. gutter inlet device as claimed in claim 1, it is characterised in that the material of the filtering medium layer (10) be cobble,
Quartz sand, activated carbon, zeolite or its mixed fillers.
9. gutter inlet device as claimed in claim 1, it is characterised in that being shaped as the permeable hole (9) be circular, square,
Rhombus, triangle, rectangle or trapezoidal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711085848.9A CN107724507A (en) | 2017-11-07 | 2017-11-07 | A kind of gutter inlet device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711085848.9A CN107724507A (en) | 2017-11-07 | 2017-11-07 | A kind of gutter inlet device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107724507A true CN107724507A (en) | 2018-02-23 |
Family
ID=61222926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711085848.9A Pending CN107724507A (en) | 2017-11-07 | 2017-11-07 | A kind of gutter inlet device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107724507A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952026A (en) * | 2018-08-31 | 2018-12-07 | 武汉华德环保工程技术有限公司 | A kind of rain leader downspout rain sewage diversion device |
| CN109211622A (en) * | 2018-09-27 | 2019-01-15 | 天津生态城水务投资建设有限公司 | A kind of initial rainwater sample collection device |
| CN109763553A (en) * | 2018-12-13 | 2019-05-17 | 四川大学 | A kind of device suitable for controlling rainfall runoff particulate matter |
| CN111441542A (en) * | 2020-03-11 | 2020-07-24 | 费贇 | Gardens drainage system |
| CN112663756A (en) * | 2020-12-17 | 2021-04-16 | 四川省建筑设计研究院有限公司 | Road surface inlet for stom water conservancy diversion cuts dirty device |
| CN112962770A (en) * | 2021-03-02 | 2021-06-15 | 北京雨人润科生态技术有限责任公司 | Rainwater overflow well |
| CN114718176A (en) * | 2022-04-21 | 2022-07-08 | 安徽省交通规划设计研究总院股份有限公司 | Anti-overflow and anti-clogging rainwater grate and working mechanism thereof |
| CN109211622B (en) * | 2018-09-27 | 2023-11-17 | 天津生态城水务投资建设有限公司 | Initial rainwater sampling collector |
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| WO2006012648A2 (en) * | 2004-07-21 | 2006-02-02 | Fabco Industries, Inc. | Storm sewer insert for filtering and treating stormwater |
| CN203065263U (en) * | 2012-12-27 | 2013-07-17 | 浙江桃花源环保科技有限公司 | Device for treating initial rainwater runoff pollution |
| CN103741783A (en) * | 2014-01-22 | 2014-04-23 | 北京建筑大学 | Efficient pollutant intercepting device for gutter inlet |
| CN105401649A (en) * | 2015-12-23 | 2016-03-16 | 山东大学 | Rainwater inlet trash barrier sieve used for filtering initial rainwater |
| CN206319391U (en) * | 2016-12-28 | 2017-07-11 | 广东中天市政工程设计有限公司 | Gutter inlet device |
| CN207919711U (en) * | 2017-11-07 | 2018-09-28 | 北京建筑大学 | A kind of gutter inlet device |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2006012648A2 (en) * | 2004-07-21 | 2006-02-02 | Fabco Industries, Inc. | Storm sewer insert for filtering and treating stormwater |
| CN203065263U (en) * | 2012-12-27 | 2013-07-17 | 浙江桃花源环保科技有限公司 | Device for treating initial rainwater runoff pollution |
| CN103741783A (en) * | 2014-01-22 | 2014-04-23 | 北京建筑大学 | Efficient pollutant intercepting device for gutter inlet |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108952026A (en) * | 2018-08-31 | 2018-12-07 | 武汉华德环保工程技术有限公司 | A kind of rain leader downspout rain sewage diversion device |
| CN109211622A (en) * | 2018-09-27 | 2019-01-15 | 天津生态城水务投资建设有限公司 | A kind of initial rainwater sample collection device |
| CN109211622B (en) * | 2018-09-27 | 2023-11-17 | 天津生态城水务投资建设有限公司 | Initial rainwater sampling collector |
| CN109763553A (en) * | 2018-12-13 | 2019-05-17 | 四川大学 | A kind of device suitable for controlling rainfall runoff particulate matter |
| CN111441542A (en) * | 2020-03-11 | 2020-07-24 | 费贇 | Gardens drainage system |
| CN112663756A (en) * | 2020-12-17 | 2021-04-16 | 四川省建筑设计研究院有限公司 | Road surface inlet for stom water conservancy diversion cuts dirty device |
| CN112962770A (en) * | 2021-03-02 | 2021-06-15 | 北京雨人润科生态技术有限责任公司 | Rainwater overflow well |
| CN114718176A (en) * | 2022-04-21 | 2022-07-08 | 安徽省交通规划设计研究总院股份有限公司 | Anti-overflow and anti-clogging rainwater grate and working mechanism thereof |
| CN114718176B (en) * | 2022-04-21 | 2023-08-22 | 安徽省交通规划设计研究总院股份有限公司 | Anti-overflow anti-clogging rain grate and working mechanism thereof |
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Application publication date: 20180223 |