KR102309781B1 - A filter screen with improved drainage efficiency for street inlet - Google Patents

Abstract

The present invention relates to a filtration cell constituting a filter screen installed in a rainwater sump, and specifically, a filtration cell and a plurality of filtration cells having structural features to smoothly perform functions of improving drainage efficiency and increasing filtration efficiency of foreign substances at the same time It relates to a filter screen for rainwater catchment composed of filtration cells.
Specifically, the present invention relates to a rainwater sloping plate through which rainwater introduced from a rainwater inlet enters; A filtration filter that filters out foreign substances through the rainwater sloping plate and passes rainwater; The cross-sectional shape of the filter screen, characterized in that the top surface is configured to intersect a second side formed vertically and form a curved surface with the second side, and the first side is bent in the direction of the second side. am.

Description

Filter screen for rainwater catchment with improved drainage efficiency {A FILTER SCREEN WITH IMPROVED DRAINAGE EFFICIENCY FOR STREET INLET}

The present invention relates to a filter screen installed in a rainwater sump, and more particularly, to a filter screen for rainwater sump in which a plurality of filtration cells designed to increase drainage efficiency and at the same time increase filtration efficiency of foreign substances are continuously arranged.

Around the world, guerrilla torrential rains and torrential downpours are increasing due to the effects of extreme weather and typhoons. When low-lying land, dams, river weirs, and urban drainage facilities to respond to this can function properly, the damage caused by these extreme weather events can be reduced. In particular, damage caused by heavy rain in urban areas is caused by inundation of houses and odors by influx of road surface water into the vicinity because rainwater (= rainwater) does not drain smoothly from sewage facilities such as rain gutter installed on the roadside. .

Considering these problems, the importance of the rainwater gutter provided between the driveway and the pedestrian path cannot be underestimated. However, it is difficult to perform both roles at the same time as a rainwater gutter, which has the function of draining rainwater and filtering foreign substances such as fallen leaves, dust, and garbage at the same time. In other words, if the spacing of the filter cells is widened by focusing on the drainage, it is difficult to filter the foreign substances or the foreign substances are accumulated in the sewage and clogged. However, the drainage is slow and this causes serious flood damage in the event of a torrential rain.

1 shows the structure of a general rainwater receiving tray 10. As shown in FIG. The rainwater catchment 10 is provided between the edge of the road and the pedestrian path, and the rainwater flowing in through the rainwater inlet 11 first flows through the rainwater sloping plate 14 and the filter screen 15 continuously installed thereon. flows down to the rainwater storage 12 below through the space between the spaced cells of the filter screen, passes through the rainwater drain 16, and is drained into sewage, and foreign substances in the rainwater are filtered by a plurality of continuous filtering cells. The filtered foreign materials fall and accumulate in the foreign material storage 13 disposed at the rear of the rainwater storage.

As described above, in order to increase the filter effect of foreign substances, the filter screen 15 formed with a narrow filtration cell interval makes it difficult to discharge rainwater through the through-holes between the filtration cells, so rainwater often overflows on roads during heavy rain. will occur

As prior art for solving this problem, Prior Document 1 and Prior Document 2 have been disclosed.

However, in the case of the prior art described in the preceding documents, when the amount of rainwater to the rainwater inlet increases, the area of the drainage passage through which rainwater passes is increased to increase the drainage efficiency, so it has a problem in that it cannot filter out small foreign substances. Accordingly, the inventor of the present invention proposes a filtration cell shape that improves the drainage efficiency and increases the filtration efficiency of foreign substances, and devised a filtration filter in which a plurality of the proposed filtration cells are arranged.

Prior Literature 1. Republic of Korea Patent Publication No. 10-1128069 (Registered on March 12, 2012) Prior Document 2. Republic of Korea Patent Publication No. 10-1126280 (Registered on 3. 6. 2012)

An object of the present invention is to provide a rainwater filtration filter capable of increasing the drainage efficiency of rainwater introduced through a rainwater catchment without deterioration of the filtration function of small foreign substances.

The present invention for solving the above technical problems,

In the filter screen installed parallel to the flow of rainwater in the upper opening of the rainwater gutter, the filter screen is spaced at a predetermined interval to form a separation hole (200) and is arranged to be perpendicular to the flow direction of rainwater. (100); A frame 300 surrounding and supporting the edge of the filtration cell; but, the cross-sectional shape of the filtration cell 100 includes an upper surface 110 that allows rainwater to flow through the rainwater sloping plate; a second side 120 vertically descending in the downward direction of the upper surface 110 in the direction in which rainwater flows; A first side 130 that goes down in the downward direction of the upper surface 110 in the direction in which rainwater flows out; is provided, and the upper surface 110 and the second side 120 are on the second curved surface 121 and the upper surface 110 and the first side surface 130 are connected by a first curved surface 131 .

Preferably, the radius of curvature R2 of the second curved surface 121 is 5 mm or less, and the radius of curvature R1 of the first curved surface 131 is 10 to 30 mm.

In the present invention, the first side surface 130 includes a stepped surface 132 having a step formed therein at the end of the first curved surface 131 , wherein the step surface is the second side surface 120 . ) is formed parallel to

Since the filter screen of the present invention has a structure in which the top surface and the second side are curved, rainwater flows in along this curved part.

The filter screen of the present invention has an effect of allowing rainwater introduced through the curved portion to be easily discharged downward due to the step surface provided on the first side surface.

The filter screen of the present invention is capable of quickly discharging rainwater even in heavy rain, while at the same time efficiently filtering small foreign substances.

1 is a cross-sectional view of a rainwater outlet installed with a filter screen of the prior art;
2 is a view showing a filter screen (B) having a cross-sectional shape (A) according to a first embodiment of the present invention
3 is a view showing a cross-sectional shape of a filter screen according to a second embodiment of the present invention;
4 is a graph for measuring the emission efficiency corresponding to the radius of curvature R1 of the filter screen;
5 is a graph for measuring the emission efficiency corresponding to the radius of curvature R2 of the filter screen;
6 is an emission efficiency measurement graph corresponding to the height (H) of the step surface of the filter screen;
7 is an emission efficiency measurement graph corresponding to the width (W) of the step surface of the filter screen;
8 is a simulation capture screen for the filter screen according to the second embodiment.

Since the present invention can have various changes and can have various embodiments, specific embodiments are illustrated in the drawings and will be described with reference to the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention. In describing each figure, like reference numerals have been used for like components. In describing the present invention, if it is determined that a detailed description of a related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

2 shows a cross-sectional shape of a filter cell shown in the first embodiment of the filter screen according to the present invention. The filter screen continuously installed on the rainwater sloping plate consists of a plurality of filtration cells arranged in a direction perpendicular to the direction in which rainwater flows in and flows. The cross-sectional shape of the filter cell has a shape cut in half in the vertical direction by standing vertically so that the pointed part of the egg faces downward. That is, the upper surface of the filtration cell is formed to be inclined downward along the flow direction of rainwater, and the second side of the filtration cell facing the direction opposite to the direction in which rainwater flows downward is substantially perpendicular to the upper surface, The first side facing the direction in which the flow is discharged is connected to the upper surface in a curved state. The first side is bent to meet the second side at the lower end.

The filter cell of the filter screen according to the present invention is preferably connected to a second curved surface 121 and a first curved surface 131 at the point where the second side and the upper surface and the upper surface and the first surface meet each other. Therefore, rainwater flowing in through the rainwater inlet passes through the upper end and flows along the first curved surface 131 and quickly flows down to the first side 130 .

3 is a view showing the cross-sectional shape of the filter cell shown in the second embodiment of the filter screen according to the present invention.

The first curved surface 131 formed by the intersection of the upper surface 110 and the first side surface 130 is configured such that the radius of curvature R1 is the same as that of the first embodiment, and the upper surface 110 and the second surface The second curved surface 121 formed by the intersection of the two side surfaces 120 is configured such that the radius of curvature R2 is also the same as that of the first embodiment.

In particular, in the cross-sectional shape of the filtration cell of the second embodiment, the first side 130 includes a step section in which a step surface 132 is formed inside at the end of the first curved surface, but the step surface 132 is It is characterized in that it is formed parallel to the second side (120). That is, the first side 130 is the first side ( 130 includes a third curved surface 140 that is curved to the second side 120 . In addition, it is preferable that the height (H) of the step surface 132 is 75 mm or more, and the width (W) is 2 mm.

As a more specific example, the filter screen composed of a plurality of continuous filtration cells 100 and the shape of the filtration cell with increased drainage efficiency proposed in the present invention has a separation hole of 5 mm, and the inclination of the filter screen. was installed at 30° the same as the inclination of the rainwater sloping plate. 4 to 7, it can be seen that the discharge efficiency of the filter screen of the present invention varies greatly depending on the shape of the filtration cell.

4 shows the results of measuring the discharge efficiency of the filter screen for rainwater catchment.

That is, basically, the filter screen is installed continuously on the rainwater sloping plate, and is installed to be inclined at an angle of 30°. The filtration cell installed inside the filter screen shown in FIG. 1 has an inverted triangle cross-sectional shape. As such, the inverted triangular filtration cell has an upper end, a second side in a direction in which rainwater flows, and a first side in a direction in which rainwater is discharged. Rainwater installed in an inverted triangle and flowing in through the rainwater inlet flows across the upper end of the inverted triangle filter cell, and rainwater flows out through the separation hole between the inverted triangle filter cells spaced at regular intervals. The inverted triangle filtration cell has a radius of curvature between the first side and the upper end of 0 mm, and the radius of curvature between the upper end and the second side is also 0 mm.

2 and 3 were simulated by changing the values of each component constituting the filtration cell in order to observe the drainage efficiency and pressure distribution according to the shape of the plurality of filtration cells 231 presented in the present invention. Drainage performance is a value obtained by calculating the amount of rainwater passing through the filter screen as a percentage of the amount of rainwater flowing into the rainwater inlet, and can be expressed by the following equation.

Efficiency = (stormwater runoff / stormwater inflow) X 100

As a result of the measurement, it was found that the discharge efficiency of rainwater that appears in the conventional filter screen for rainwater catchment with such sharp vertices was only 7.11%.

On the other hand, as can be seen in FIG. 4, for various filter screens for rainwater catchment in contrast to this, the rainwater discharge efficiency was the highest when the radius of curvature (R1) of the first curved surface formed by the upper surface and the first side was 10 to 30 mm. 5, by changing the radius of curvature R2 of the second curved surface 121 in a state where the radius of curvature R1 of the first curved surface 131 is fixed to 30 mm, the second curved surface As a result of measuring the rainwater discharge efficiency according to the radius of curvature in (121), the radius of curvature of the second curved surface 121 was highest at 5 mm, and rather lower at 10 mm than when the radius of curvature was 0 mm.

6 is a measurement of the change in rainwater discharge efficiency due to the step surface formed on the first side in the cross-sectional shape of the filtration cell of the second embodiment. When measuring only the height of the step while keeping the width of the step constant at 2mm, it is not significantly affected by the height of the step, and when the step height is 75mm or more, the rainwater discharge efficiency increases rapidly.

7 is a measurement of the change in rainwater discharge efficiency due to the stepped surface formed on the first side in the cross-sectional shape of the filtration cell of the second embodiment. changed the width. The most desirable result was obtained when the width of the step surface was 2 mm. In the case of simulation by setting the values of h=75mm and w=2mm presented in the above specific example, a drainage efficiency of about 87.99% can be obtained.

8 is a simulation result showing the drainage efficiency of the filter screen according to FIG. In order to quantitatively evaluate the drainage efficiency according to the shape of the plurality of filtration cells presented in the present invention and the stormwater flow around the filtration filter, the turbulence model of ANSYS FLUENT 16.0 was selected for analysis. Fig. 8A is a simplified diagram of a filter screen of the second embodiment, Fig. 8B is a pressure contour around the filtration cell, Fig. 8C is a velocity contour, and Fig. 8D is a simulation of a velocity vector. show the results.

Referring to the simulation results of FIGS. 8B and 8C, as the radius of curvature R1 of the first curved surface shown in FIG. 3 increases, the area adjacent to the upper surface has a lower storm pressure than the area away from the upper surface 110. It can be seen that have. As the rainwater pressure is lowered, the flow rate of rainwater is increased, and the rainwater flows quickly along the portion adjacent to the upper surface 110, thereby improving drainage efficiency. 8D is a graph showing the flow velocity and direction of rainwater together, and the closer to red, the faster the flow velocity. Referring to the simulation result of FIG. 8D , it can be seen that the pressure drop occurs in the region adjacent to the upper surface 110 and the region adjacent to the step surface 132 , and the flow rate increases.

10: raindrop
11: Rainfall inlet
12 : Rainwater Reservoir
13: foreign material storage
14: rain slope plate
15: filter screen
16: storm drain
100: filtration cell
110: upper surface
120: second side
121: second curved surface
130: first side
131: first curved surface
132: step surface
140: third curved surface
200: spaced through hole
300 : frame

Claims (4)

A filter screen for rainwater catchment that is installed to be inclined continuously on the rainwater sloping plate, but rainwater flows down to the rainwater reservoir below through the separation space between the separated filtering cells of the filter screen, and foreign substances from the rainwater are filtered by a plurality of continuous filtering cells. In

The filter screen is installed to be inclined so as to extend to the even sloping plate,
Filter cells 100 arranged to be perpendicular to the flow direction of rainwater while being spaced apart at a predetermined interval to form a spaced through hole 200;
A frame 300 that surrounds and supports the edge of the filtration cell;

The cross-sectional shape of the filtration cell 100 is,
The upper surface 110 through which rainwater flows;
a second side 120 vertically descending in a downward direction of the upper surface 110 in the direction in which rainwater flows;
A first side 130 that goes down in the downward direction of the upper surface 110 in the direction in which rainwater flows out; is provided,
The upper surface 110 and the second side surface 120 are connected by a second curved surface 121 , and the upper surface 110 and the first side 130 are connected by a first curved surface 131 . becomes,
The first side surface 130 includes a stepped surface 132 having a step formed therein at the end of the first curved surface 131 , wherein the stepped surface is formed parallel to the second side surface 120 . become,
The first side 130 is gently curved in the direction of the second side 120 from the step surface 132 to form a third curved surface 140. screen.
According to claim 1,
The second curved surface 121 has a radius of curvature R2 of 5 mm or less, and a radius of curvature R1 of the first curved surface 131 is 10 to 30 mm. screen.
delete According to claim 1,
The height (H) of the step surface (132) is 75mm, the width (W) is a filter screen for rainwater catchment with improved drainage efficiency, characterized in that it is 2mm.

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