CN215195814U

CN215195814U - Quick rainwater filtering device

Info

Publication number: CN215195814U
Application number: CN202120588651.2U
Authority: CN
Inventors: 周青
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-03-23
Filing date: 2021-03-23
Publication date: 2021-12-17
Anticipated expiration: 2031-03-23

Abstract

The utility model provides a rainwater rapid filtration device, include: box (100), box (100) upper portion is opened and is equipped with water inlet pipe (201), water inlet pipe (201) and rainwater collection mechanism's downspout intercommunication, the following top-down of water inlet pipe (201) is equipped with in proper order: the filter screen type sewage interception and filtration device comprises a filter screen type sewage interception and filtration structure (101), at least one horizontally arranged backwashing drainage groove (102), a filter material filtering layer (103), a supporting layer (104), a perforated pipe water distribution system (105) and the like. This device can filter large granule pollutant, the greasy dirt on rainwash ground fast, high-efficiently to need not artifical clearance filtering layer and blocks up. The back washing filtering speed is several times higher than the slow filtering speed, and the filtering effect is better.

Description

Quick rainwater filtering device

Technical Field

The utility model relates to a sponge city water treatment technical field, a concretely designs rainwater rapid filtration device.

Background

China is reported to be one of the most water deficient countries in the world. Although the total amount of fresh water resources is rich, the population base of China is large, the fresh water occupied by all people is little, and the distribution is uneven. Particularly, in recent years, with the rapid development of national economic construction, the water shortage condition of China is more prominent, and the situation is very severe. The water-deficient cities are widely distributed in all regions of the country, and the water-deficient reasons are different, and the northern area is resource water-deficient; the south is water quality water shortage; the midwest is the water shortage of engineering. Cities in northern China are mainly located in temperate monsoon climate areas, rains are heavy in summer, rains are light in winter, distribution of precipitation seasons is uneven, total precipitation is generally smaller than 1000mm, and precipitation is not heavy. Belonging to resource water shortage; southern regions are abundant in rainfall and water resources, belong to humid regions, but southern cities develop fast in economy, and gather a large number of factories and residents, so that industrial and agricultural water consumption and living consumption are large. And the urban environment protection system is not suitable for urban economic development, which causes a series of problems of environmental destruction, river pollution, large sewage discharge and the like. The water which can be used in the southern city due to water shortage and reaches the national standard belongs to water quality type water shortage. At present, people are facing to the major problem of water shortage, the problem of water resource shortage limits the development of social economy, influences the life of people, and the problem of solving the problem is urgent.

On the other hand, despite the serious shortage of water resources in China, some people still need to seek personal benefits, do not consider the whole world, do not consider the overall development of the society, excessively squeeze nature, utilize nature, for example, agricultural water or industrial water is directly discharged into natural water without treatment or treatment is not up to standard, and the like. At present, water-deficient cities are widely distributed all over the country, the whole condition of water resources is not optimistic, a plurality of natural water bodies are polluted to cause the self-purification capacity to decline, the natural regulation time is prolonged, the original state cannot be achieved, and the polluted rivers are turbid and emit foul smell.

Water shortage restricts the development of urban economy and society and influences the life of residents; in contrast, the resource utilization of urban rainwater is in the eye of people, and the utilization technology enables the rainwater recycling to be an indispensable topic at present.

The reasonable development and utilization of rainwater resources are an important effective way for relieving the urban water resource shortage problem and reducing the river pollution problem at the present stage. In the traditional rainwater collection, after rainwater falls to the ground, one part of rainwater is infiltrated to supplement underground water through ground infiltration, and the other part of rainwater which is not infiltrated flows into a rainwater port after being gathered on the ground, and then is directly discharged into a natural water body through a centralized pipeline or is lifted by a pump and discharged into the natural water body. However, the conventional rainwater collection is not suitable after the current economy is developed at a high speed, and the problems of urban waterlogging, rainwater pollution, loss and the like are mainly caused. Therefore, research of a new rainwater collection system is indispensable.

The rainwater recycling can supply urban underground water, relieve ground settlement, promote urban greening, reduce flood prevention pressure, reduce rainwater runoff pollution and the like, can also effectively increase urban water resource supply, relieve the situation of urban water resource shortage, and save municipal and resident water expenses.

Internationally, many countries have already developed the work of treating and recycling rainwater. China develops rainwater for reuse later than the western countries, but develops rapidly. China also focuses on the collection and utilization of rainwater resources, sets a series of relevant policies, and collects professional talents and relevant technologies in the aspect of society. Among them, the sponge city is one of the projects, and many cities with better economic development such as Shanghai, Xiamen, Shenzhen, etc. have been tried on, and have received a more satisfactory achievement list. However, the sponge city has wide coverage and high economic requirement, and the sponge city is difficult to be built comprehensively for some laggard cities. Various measures are developed and a plurality of policies are promulgated in the aspect of rainwater resource collection and utilization in China, the full utilization of rainwater resources is promoted, and although some problems still exist in the application process, the key step is already gone.

In the past, rainwater is mostly treated in China by using a combined drainage system which uses rainwater and domestic sewage industrial wastewater to share one pipeline and directly discharge the rainwater into a sewage plant. Along with the rapid development of economy and the gradual enhancement of environmental protection consciousness of people, the water pollution treatment work of China is continuously deepened, the rainwater and sewage shunt mode is convenient for rainwater recycling, the impact of water quantity on the municipal sewage treatment plant is reduced, the pressure of the municipal sewage treatment plant is relieved, the treatment efficiency of the municipal sewage treatment plant is ensured, and the mode is gradually emphasized, and the effect is obvious. Therefore, the great propulsion of the rain and sewage flow system becomes an important measure for improving and enhancing the water environment quality.

Rain and sewage flow control means that rain water and sewage are respectively discharged into respective special pipelines, the sewage is collected into a main sewage pipeline and sent into an urban sewage plant for centralized treatment, and the rain water is directly discharged into a natural water body by collecting a rain water pipe network.

However, the drainage system still has defects, and the harm of initial rainwater is neglected. People feel that rainwater is cleaner, the pollution components are less, most of the rainwater is inorganic particles without pollution, the rainwater can be directly discharged into a river channel without being sent into a biological system of a municipal sewage plant for treatment, and the environmental pollution is avoided. The later stage rainwater is the same, but the initial stage rainwater generally refers to surface scouring rainwater, the rainwater contains more pollutants, and if the rainwater is collected by a rainwater pipe network and then is directly discharged into a natural water body, the water body is seriously polluted.

Therefore, rainwater must be simply treated and filtered to reach the standard and then recycled. The collected filtered rainwater can replace tap water within a certain range, so that the current situation of water resource shortage is relieved, and the pressure of urban sewage plants is reduced. The design is adopted on the distribution of rain and sewage system, adds one deck filtration treatment to the rainwater to reach certain standard after, with being used for watering flowers, the pond is mended water, spills and sweeps the highway, washes closestool etc. strengthens the rainwater and collects the utilization, saves municipal administration and resident's water spending.

In the prior art, the simple filtering device has long filtering time, and the pressure of the device is overlarge when rainstorm and other conditions occur. After a period of filtration, a lot of impurities will be accumulated in the filter layer, which results in the blockage of the filter layer and further causes a long filtration time. If the cleaning is manually carried out, the workload is large and the working frequency is high. In view of the above, it is desirable to find a device that can rapidly filter rainwater, reduce labor, and facilitate management. And also have some rainwater filter equipment among the prior art, have back flush technique, but often the structure is complicated, and manufacturing cost is high, is unfavorable for extensive popularization.

Disclosure of Invention

The utility model aims at:

to the not enough of above-mentioned prior art, provide a quick filter equipment of rainwater, can filter large granule pollutant, the greasy dirt on rainwash ground fast, high-efficiently to need not artifical clearance filtering layer jam. The back washing filtering speed is several times higher than the slow filtering speed, and the filtering effect is better.

The purpose of the utility model can be realized by the following technical scheme:

a rapid rainwater filtration device comprising: the box, the box upper portion is opened and is equipped with the mouth of pipe of intaking, the mouth of pipe of intaking communicates with the rainwater pipe of rainwater collection mechanism, and the following top-down of the mouth of pipe of intaking is equipped with in proper order: the filter screen type sewage interception filter structure comprises a filter screen type sewage interception filter structure, at least one transversely arranged back flush drainage tank, a filter material filter layer, a bearing layer, a perforated pipe water distribution system and the like.

The filter screen type dirt intercepting and filtering structure is a hanging basket type filter screen, the upper portion of the side wall of the filter screen type dirt intercepting and filtering structure is a coarse filter screen with a grid structure with rectangular strip-shaped gaps, the lower portion of the side wall and the bottom surface of the hanging basket type filter screen are fine filter screens, and oil filtering cloth is additionally arranged on the bottom surface of the hanging basket type filter screen.

At least one end of each backwash water drainage groove is connected with the wall of the box body, a through hole matched with the backwash water drainage groove is formed in the wall of the box body, the backwash water drainage groove is communicated with a wastewater drainage pipe and is led into a wastewater channel, and wastewater collected by the wastewater channel is discharged into a sewage pipeline through a wastewater outlet pipe and enters a sewage treatment plant for further treatment. The total plane area of the one or more back flushing drainage grooves does not exceed 30 percent of the total plane area of the box body, so that the water flow can be ensured to flow through rapidly.

The filtering material filtering layer is arranged below the backwashing drainage tank, and the bottom surface of the backwashing drainage tank is at least 100mm higher than the top surface (namely an expansion surface) of the filtering material filtering layer. For the expansion of the filter bed.

The filter material filtering layer is a double-layer filter material filtering layer, the filter material on the upper layer is light coarse filter material, and the filter material on the lower layer is heavy fine filter material. In the preferred scheme, the light coarse filter material is anthracite particles, and the heavy fine filter material is quartz sand. The coal and sand double-layer filter material filtering layer uses uniform filter materials as much as possible, reduces the degree of hydraulic classification, and enables the two filtering layers to keep respective states without obvious mixing under the hydraulic classification effect of reverse secondary washing. The upper layer is made of smokeless coal particles with the relative density of 1.4-1.7, and belongs to light coarse filter material; the lower layer is quartz sand with the relative density of 2.6-2.7, and belongs to heavy fine filter materials. The relative density refers to the mass ratio of coal and sand (including pores and fissures of the inner surface and the outer surface of the coal and the sand) to the mass of the same temperature and the same volume of water at 20 ℃. When water is filtered, the water passes from top to bottom, firstly passes through the anthracite particle layer to intercept most impurities contained in the water, and then passes through the quartz sand layer to intercept the residual impurities contained in the water, so that the double-layer filter layer can play respective roles. The coal and sand double-layer filter layer is adopted, so that the dirt-removing power is good, the material is economic, and certain economic benefit can be brought.

The bearing layer is connected with the bottom surface of the filter material filtering layer and used for supporting the filter material filtering layer, and the bearing layer preferably adopts a gravel bearing layer. The gravel bearing layer is mainly used for supporting the filter material, and if the bearing layer is not arranged, the filter material is directly contacted with the water distribution system and is easy to run off from the water distribution system. And assists in evenly distributing water during the back flushing process. The gravel supporting layer is contacted with the coal and sand filter material layer, and the lower part of the gravel supporting layer is contacted with the water distribution system, so the size of the gravel is set according to the granularity of the bottom of the filter material and the size of the water distribution holes, and the gravel is roughly considered according to 4 times of the aperture.

The perforated pipe water distribution system is connected with the bottom surface of the supporting layer and comprises at least one water distribution main pipe arranged transversely and a plurality of water distribution branch pipes communicated with the water distribution main pipe, the water distribution branch pipes are uniformly distributed transversely by taking the water distribution main pipe as the center, and at least one row of holes are formed in the upper surfaces of the water distribution branch pipes; one end of the water distribution main pipe is connected with the wall of the tank body, and the wall of the tank body is provided with a through hole matched with the water distribution main pipe and is finally communicated with the flushing water pipe and the water collecting pipe in parallel.

The flushing water pipe and the water collecting pipe are arranged outside the tank body, the other end of the flushing water pipe is connected with the pressurized water supply device, and the other end of the water collecting pipe is communicated with the water collecting pipe of the reclaimed water recycling mechanism. The pressurized water supply device comprises at least one flushing pump and a high-level water tank matched with the flushing pump for storing water.

The utility model has the advantages that:

through the dual arrangement of the filter screen type dirt-intercepting filter structure, namely coarse filtration and the filter material filter layer, namely fine filtration, the filter speed and the efficiency are improved, and the conditions of concentrated rainfall and large rainfall in designated areas can be met. After a period of filtration, many impurities are accumulated in the filter layer of a common filter device, which results in the blockage of the filter layer. If the cleaning is manually carried out, the workload is large and the working frequency is high. In this respect, a device for recovering the filterability clarification of the filter layer needs to be found, and a method for washing the filter layer from bottom to top by using water, namely backwashing filtration, is locked. Water passes through the filter layer from bottom to top, when the upward flow velocity is large enough, the filter materials in the filter layer can be suspended in the upward water flow to collide and rub with each other, sludge and impurities accumulated on the surface of the filter materials are quickly separated from the surface of the filter materials under the dual actions of the friction force between the filter materials and the shearing force of the water, and the sludge and the impurities are discharged out of the pool through the water outlet pipeline along with the upward flushing of the water flow. The back washing is used for filtering and removing the sludge impurities in the filtering layer, generally only a few minutes is needed, the speed is high, and the filtering efficiency is high.

The utility model discloses a rainwater rapid filtration device compares the merit shortcoming of multiple filtering layer according to back flush technique, has finally established the double-deck filter material filtering layer of the thin filter material of the coarse filter material of light and heavy matter. The speed of the back washing and the filtering is tens of times higher than that of the slow filtering, and the filtering effect is better. During the back washing process, water passes through the filter layer from bottom to top, when the upward flow velocity is high enough, the filter materials in the filter layer can be suspended in the upward flow to collide and rub with each other, sludge and impurities accumulated on the surface of the filter materials are quickly separated from the surface of the filter materials under the double actions of the friction force between the filter materials and the shearing force of the water, the filterability clarification of the filter layer is quickly recovered, and the problem of filter layer blockage is solved. However, in the backwashing process, when the filter material reaches a certain degree of expansion, the filter material particles are classified under the action of water power. Therefore, the utility model discloses a double-deck filter material filtering layer is chooseed for use to filter equipment, utilizes the material quality difference effectively to solve this problem.

The utility model discloses a quick filter equipment of rainwater still has simple structure, and low in production cost is fit for popularizing and applying on a large scale.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic partial structural view of the present invention, which is a side view of the filter screen type dirt-intercepting filter structure 101.

Fig. 3 is a second partial schematic view of the present invention, which is a schematic view of the perforated pipe water distribution system 105.

Wherein:

100. a box body; 101. the filter screen type sewage interception filter structure; 102. backwashing the drainage channel; 103. a filter material filtering layer; 104. a support layer; 105. a perforated pipe water distribution system; 106. a water distribution main pipe; 107. a water distribution branch pipe; 108. an eyelet; 109. flushing the water pipe; 110. a waste water drain pipe; 111. a waste water channel; 112. a flush pump; 113. a high-level water tank; 114. a waste water channel; 115. a water inlet pipe of the high-level water tank;

201. a water inlet pipe orifice; 202. a water collection pipe; 203. and a waste water outlet pipe.

Detailed Description

The invention will be further explained with reference to the drawings and the specific embodiments.

As shown in fig. 1, a rapid rainwater filtering apparatus includes: the box 100, box 100 upper portion is opened and is equipped with water inlet 201, water inlet 201 and rainwater collection mechanism's downspout intercommunication, the following top-down of water inlet 201 is equipped with in proper order: the filter screen type sewage interception filter structure comprises a filter screen type sewage interception filter structure, at least one transversely arranged back flush drainage tank, a filter material filter layer, a bearing layer, a perforated pipe water distribution system and the like.

As shown in fig. 2, the filter screen type dirt intercepting and filtering structure 101 is a hanging basket type filter screen, the upper part of the side wall of the hanging basket type filter screen is a coarse filter screen with a grid structure with rectangular strip-shaped gaps, the lower part of the side wall and the bottom surface of the hanging basket type filter screen are fine filter screens, and oil filtering cloth is additionally arranged on the bottom surface of the hanging basket type filter screen.

The initial stage rain wash ground has more pollutant, wherein do not have the great pollutant of some volumes, like the leaf, wrapping bag etc. if directly arrange the pipeline and do not handle, do not exempt from the risk of blockking up the pipeline. In the second time, the sewage intercepting hanging basket device is adopted in the design, and the garbage with large volume is detained in the water treatment for centralized treatment. The filter screen type pollutant intercepting and filtering structure 101 is mainly used for intercepting large garbage and storing a part of garbage. For streets with more restaurants or automobile battery car repair shops, oil substances are not contained in rainwater, and the rainwater can be simply filtered and removed, so that the standard of recycling can not be met; if the waste water is directly discharged into the river body without being treated, the pollution of the river body can be caused. Therefore, a layer of oil filtering cloth is paved on the sewage-intercepting hanging basket device in the device, and the oil is removed from the rainwater for further recycling.

In a preferred scheme, the fine filter screen is a filter screen with the diameter of 3mm, the internal material is high-quality stainless steel, and the width of the rectangular strip-shaped gap is 3-4 mm. The fine filter screen can intercept larger garbage when the inlet pipe introduces rainwater, namely leaves, packaging bags and the like, and plays a primary filtering effect in rainwater collection and sewage treatment, so that the later rainwater collection and sewage treatment process becomes simpler and more effective. The pollutants intercepted by the filter screen are concentrated together, so that the cleaning is convenient, the deposited sand grains and the garbage generated by filtering are conveniently cleaned, and the normal work of the later-stage device is effectively protected. The rectangular strip-shaped gaps prevent the situation that garbage in the fence basket is excessively accumulated to block the meshes of the filter screen or the situation that rainfall is concentrated in a certain area and the rainfall intensity is high, and only the lower layer of meshes with pollutants is insufficient for rainwater to pass through.

At least one end of each backwash water discharge groove 102 is connected with the wall of the tank body, and the wall of the tank body is provided with a through hole matched with the backwash water discharge groove 102, communicated with a waste water discharge pipe 110 and led into a waste water channel 111. The waste water channel 111 mainly functions to collect filtered waste water. When the backwashing process is carried out, the water flow is introduced into the waste water channel 111 from the backwashing water drainage tank 102 and the waste water drainage pipe 110 to collect the waste water after the filtering layer is flushed by the water flow from bottom to top, and the waste water collected by the waste water channel 111 is drained into a sewage pipeline through the waste water outlet pipe 203 and enters a sewage treatment plant for further treatment.

The total planar area of the one or more backwash drainage channels 102 is no more than 30% of the total planar area of the tank 100, which ensures rapid flow therethrough. A waste water passage 114 may be additionally provided between the backwash drain tank 102 and the waste water drain pipe 110 to reduce the number of the waste water drain pipes 110 and save cost. After a simple natural filtering device filters for a period of time, a lot of impurities are accumulated in the filtering layer, so that the filtering layer is blocked. If the cleaning is manually carried out, the workload is large and the working frequency is high. In view of the above, it is necessary to find a device for recovering the filterability and clarification of the filter layer, which locks a method for washing the filter layer with water from bottom to top, namely, backwashing filtration. Water passes through the filter layer from bottom to top, when the upward flow velocity is large enough, the filter materials in the filter layer can be suspended in the upward water flow to collide and rub with each other, sludge and impurities accumulated on the surface of the filter materials are quickly separated from the surface of the filter materials under the dual actions of the friction force between the filter materials and the shearing force of the water, and the sludge and the impurities are discharged out of the pool through the water outlet pipeline along with the upward flushing of the water flow. The back washing is used for filtering and removing the sludge impurities in the filtering layer, generally only a few minutes is needed, the speed is high, and the filtering efficiency is high.

The filter material filtering layer 103 is arranged below the back washing drainage groove 102, and the bottom surface of the back washing drainage groove 102 is at least 100mm higher than the top surface (i.e. the expansion surface) of the filter material filtering layer 103. For the expansion of the filter bed.

The filter material filtering layer 103 is a double-layer filter material filtering layer, the filter material on the upper layer is light coarse filter material, and the filter material on the lower layer is heavy fine filter material. In the preferred scheme, the light coarse filter material is anthracite particles, and the heavy fine filter material is quartz sand. In the back washing process, when the filter material reaches a certain expansion degree, the filter material particles can generate a classification phenomenon under the action of water power. The fine component of the filter material goes to the upper layer, and the coarse component of the filter material enters the lower layer. After the back washing is finished, the filtering layer still keeps the existing grading phenomenon and shows reverse grading. When the backwashing is finished and the filtration is carried out again, the water flow passes through the upper layer of the fine component filter material from top to bottom, a large amount of suspended matters are intercepted, the surface layer of the filter layer is blocked quickly, and the filter tank reaches the pressure period earlier. In contrast, the device adopts a double-layer filter material filtering layer, and the upper layer of the filtering layer is the anthracite particles with the relative density of 1.4-1.7, and belongs to light coarse filtering materials; the lower layer is quartz sand with the relative density of 2.6-2.7, and belongs to heavy fine filter materials. The relative density refers to the mass ratio of coal and sand (including pores and fissures of the inner surface and the outer surface of the coal and the sand) to the mass of the same temperature and the same volume of water at 20 ℃. Because the particle shapes are uniform, the porosity of the coal and sand filter layers is approximately the same, so the pores in the quartz sand filter layer are small and many, and the pores in the smokeless coal particle filter layer are large and few. When the two layers of filter materials are mixed, the lower quartz sand filter material can partially enter the gap of the upper anthracite particle filter material, so that the pore size of the anthracite particle filter material layer is reduced, and the dirt-containing capacity of the filter layer is increased.

The coal and sand double-layer filter material filtering layer 103 uses uniform filter materials as much as possible, reduces the degree of hydraulic classification, and enables the two filtering layers to keep respective states without obvious mixing under the hydraulic classification effect of reverse secondary washing. The upper layer is made of smokeless coal particles with the relative density of 1.4-1.7, and belongs to light coarse filter material; the lower layer is quartz sand with the relative density of 2.6-2.7, and belongs to heavy fine filter materials. When water is filtered, the water passes from top to bottom, firstly passes through the anthracite particle layer to intercept most impurities contained in the water, and then passes through the quartz sand layer to intercept the residual impurities contained in the water, so that the double-layer filter layer can play respective roles. The coal and sand double-layer filter layer is adopted, so that the dirt-removing power is good, the material is economic, and certain economic benefit can be brought.

The supporting layer 104 is connected with the bottom surface of the filter material filtering layer 103 and is used for supporting the filter material filtering layer 103, and the supporting layer is preferably a gravel supporting layer. The gravel bearing layer is mainly used for supporting the filter material, and if the bearing layer is not arranged, the filter material is directly contacted with the water distribution system and is easy to run off from the water distribution system. And assists in evenly distributing water during the back flushing process. The gravel supporting layer is contacted with the coal and sand filter material layer, and the lower part of the gravel supporting layer is contacted with the water distribution system, so the size of the gravel is set according to the granularity of the bottom of the filter material and the size of the water distribution holes, and the gravel is roughly considered according to 4 times of the aperture.

The perforated pipe water distribution system 105 is connected with the bottom surface of the supporting layer 104.

As shown in fig. 3, the perforated pipe water distribution system 105 comprises at least one horizontally arranged water distribution main pipe 106 and a plurality of water distribution branch pipes 107 communicated with the water distribution main pipe 106, the water distribution branch pipes 107 are horizontally and uniformly distributed by taking the water distribution main pipe 106 as a center, and at least one row of holes 108 are arranged on the upper surfaces of the water distribution branch pipes 107; one end of the water distribution main pipe 106 is connected with the wall of the tank body, and the wall of the tank body is provided with a through hole matched with the wall of the tank body and is finally communicated with the flushing water pipe 109 and the water collecting pipe 202 in parallel.

The primary function of the perforated pipe distribution system 105 is to distribute backwash water evenly across the entire filter plane and to collect the filtered clean water evenly during filtration. The uniformity of water distribution by perforated pipe distribution system 105 affects the overall backwash effectiveness. If the water distribution of the water distribution system is uneven, one part of the filter layer is not enough to expand, and the other part of the filter layer is too much expanded. The filter layer which is not expanded enough has insufficient effect of washing the filter material, meanwhile, the filter layer which is expanded too much can generate the phenomenon of 'sand leakage', and when the gravel in the lower supporting layer is driven by the backwashing water flow to move upwards, the filter layer which is expanded too much can generate the phenomenon of 'sand leakage'. The water distribution branch pipe 107 is provided with one or more rows of small-bore holes, when the system is in filtering action, the water is collected after filtering, and when the system is in backwashing action, the water distribution of the water distribution system is uniform.

The flushing water pipe 109 and the water collecting pipe 202 are arranged outside the box body 100, the other end of the flushing water pipe 109 is connected with the pressurized water supply device, and the other end of the water collecting pipe 202 is communicated with the water collecting pipe of the reclaimed water recycling mechanism. The pressurized water supply includes at least one flush pump 112 and a cooperating head tank 113 for storing water. The head tank 113 contains conventional fittings such as a head tank inlet pipe 115. The head tank 113 is used to store water and supply water by gravity flow when the apparatus is backwashed, and is usually located at the highest position of the building. The washing pump 112 is mainly used for pressurizing water during the back washing process of the equipment, so that the back washing strength reaches the proper strength. In a preferred embodiment, the working chamber of the flush pump 112 is formed by its pump body and pump cover, and the rotor is formed by the impeller, shaft and bearings, etc. The two sides of the impeller are provided with sealing rings, and the rear cover plate is provided with a balance hole to balance the axial force of the washing pump. The head of the flush pump 112 should be calculated and selected based on the actual requirements to ensure that the system achieves the desired economic and environmental value.

The utility model discloses a theory of operation is:

when rainwater passes through the rain and sewage diversion device and is discharged into the device through the water inlet pipe opening 201, initial rainwater flows into the device firstly, and the initial rainwater scours the road surface and contains more pollutants, inevitably some impurities with larger volume. The filter screen type sewage interception filter structure 101 is used for intercepting impurities with large volume, a layer of oil filter cloth is laid at the bottom of the device, and oil substances in rainwater are filtered in the step. The primarily filtered rainwater enters the filter material filtering layer 103 from top to bottom, firstly passes through the anthracite particle filtering layer to intercept most impurities contained in the water, and then passes through the quartz sand filtering layer to intercept the residual impurities contained in the water. The filtered clean water is collected by a perforated pipe water distribution system 105 at the lower part of the supporting layer 104 and flows out of the pool. The filtration continues until filter media filtration layer 103 becomes clogged.

When the filter material filtering layer 103 is blocked, the water inlet pipe opening 201 stops water inlet, the flushing water pipe 109 conveys back flushing water into the tank, the filter material filtering layer 103 is flushed from bottom to top through the supporting layer 104 after being uniformly distributed by the lower perforated pipe water distribution system 105, and then the filter material filtering layer passes through the quartz sand filtering layer and then the smokeless coal particle filtering layer. Because the rising flow velocity is large enough, the filter materials in the filter material filter layer 103 suspend in the rising water flow and collide and rub with each other, sludge and impurities accumulated on the surface of the filter materials are rapidly separated from the surface of the filter materials under the dual actions of the friction force between the filter materials and the shearing force of the water, and the sludge and the impurities are flushed upwards along with the water flow. The filter materials are subject to the quality factors of the filter materials, and the respective states are kept without obvious mixing. The wastewater generated by the back flush is introduced into the wastewater channel 111 through the back flush water discharge tank 102 and the wastewater discharge pipe 110 to be collected, and the wastewater collected by the wastewater channel 111 is discharged into a sewage pipeline through the wastewater outlet pipe 203 and enters a sewage treatment plant for further treatment.

Although the invention has been described and illustrated herein with reference to a particular arrangement or configurations, it is not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention.

The utility model relates to a part all is the same with prior art or can adopt prior art to realize.

Claims

1. A rainwater rapid filtration device is characterized by comprising:

box (100), box (100) upper portion is opened and is equipped with water inlet pipe (201), water inlet pipe (201) and rainwater collection mechanism's downspout intercommunication, the following top-down of water inlet pipe (201) is equipped with in proper order:

a filter screen type dirt-intercepting filter structure (101); and

at least one backwash drainage groove (102) which is transversely arranged, wherein at least one end of each backwash drainage groove (102) is connected with the wall of the box body, a through hole which is matched with the backwash drainage groove is arranged on the wall of the box body, the backwash drainage groove is communicated with a wastewater drainage pipe (110) and is led into a wastewater channel (111), and wastewater collected by the wastewater channel (111) is discharged into a sewage pipeline, namely a sewage treatment plant through a wastewater outlet pipe (203); and

the filter material filtering layer (103) is a double-layer filter material filtering layer, the filter material on the upper layer is light coarse filter material, and the filter material on the lower layer is heavy fine filter material; and

the supporting layer (104) is connected with the bottom surface of the filter material filtering layer (103) and is used for supporting the filter material filtering layer (103); and

the perforated pipe water distribution system (105) is connected with the bottom surface of the supporting layer (104), the perforated pipe water distribution system (105) comprises at least one horizontally arranged water distribution main pipe (106) and a plurality of water distribution branch pipes (107) communicated with the water distribution main pipe, the water distribution branch pipes (107) are horizontally and uniformly distributed by taking the water distribution main pipe (106) as the center, and the upper surfaces of the water distribution branch pipes (107) are provided with at least one row of holes (108); one end of the water distribution main pipe (106) is connected with the wall of the tank body, and the wall of the tank body is provided with a through hole matched with the water distribution main pipe and is finally communicated with the flushing water pipe (109) and the water collecting pipe (202) in parallel;

the flushing water pipe (109) and the water collecting pipe (202) are arranged outside the box body (100), the other end of the flushing water pipe (109) is connected with the pressurized water supply device, and the other end of the water collecting pipe (202) is communicated with the water collecting pipe of the reclaimed water recycling mechanism.

2. A rapid rainwater filtering device as claimed in claim 1, wherein said filtering net type dirt-intercepting filtering structure (101) is a hanging basket type filtering net, the upper part of the side wall is a coarse filtering net with a grid structure with rectangular strip-shaped gaps, the lower part of the side wall and the bottom surface of the hanging basket type filtering net are fine filtering nets, and oil-filtering cloth is additionally arranged on the bottom surface of the hanging basket type filtering net.

3. A rapid rainwater filtration apparatus according to claim 1 wherein the total plan area of said one or more backwash drainage channels (102) is no more than 30% of the total plan area of the tank (100).

4. A rapid rainwater filtering device as claimed in claim 1, wherein the bottom surface of said back flush water drain tank (102) is at least 100mm higher than the top surface of the filtering material filtering layer (103).

5. The rapid rainwater filtration device according to claim 1, wherein the light coarse filter material is anthracite particles, and the heavy fine filter material is quartz sand.

6. A rapid rainwater filtration apparatus as claimed in claim 1 wherein said pressurized water supply means includes at least one flush pump (112) and associated high level tank (113) for storing water.