阅读说明：本技术 一种用于海绵城市建设的排水系统 (A drainage system for sponge city construction ) 是由 刘�英 赵荣钦 于 2021-08-13 设计创作，主要内容包括：本发明涉及道路排水过滤领域,具体涉及一种用于海绵城市建设的排水系统。排水筒引导水流从上向下流动；滤网盘安装在排水筒的进水口端,滤网盘阻挡垃圾使水流通过。排污扇的安装轴可转动地插装在滤网盘的轴心处,每个排污叶片下端与滤网盘底面贴合,以在转动过程中能将堵塞滤孔垃圾排出滤网盘,且排污叶片被设置成在水流中具有至少克服水流对排污叶片的冲击力的部分的浮力。排污叶片通过自身结构或者外部结构在水流中具有浮力,该浮力至少克服水流从上往下经过对排污叶片的冲击力的部分。动力叶轮设置在排水筒内,底部可转动地安装在支架上,配置成在水流的带动下转动。动力叶轮通过传动机构带动安装轴转动。以达到疏通排水管的效果。(The invention relates to the field of road drainage and filtration, in particular to a drainage system for sponge city construction. The drainage cylinder guides water flow to flow from top to bottom; the filter screen dish is installed at the water inlet end of a drainage cylinder, and the filter screen dish blocks rubbish and makes rivers pass through. The installation axle of blowdown fan rotationally cartridge is in the axle center department of filter screen dish, and every blowdown blade lower extreme and filter screen dish bottom surface laminating to can discharge the filter screen dish with blockking up the filtration pore rubbish in the rotation process, and the blowdown blade is set to have the partial buoyancy of overcoming the impact force of rivers to the blowdown blade at least in rivers. The dirt discharge blade has buoyancy in the water flow through its own structure or an external structure, and the buoyancy overcomes at least a portion of the water flow passing through the impact force on the dirt discharge blade from top to bottom. The power impeller is arranged in the drainage cylinder, and the bottom of the power impeller is rotatably arranged on the bracket and is configured to rotate under the driving of water flow. The power impeller drives the mounting shaft to rotate through a transmission mechanism. So as to achieve the effect of dredging the drain pipe.)

1. The utility model provides a drainage system for sponge city construction, includes the collar, its characterized in that: the sewage treatment device also comprises a drainage cylinder, a sewage discharge fan, a filter screen disc and a power impeller;

the drainage cylinder is fixedly sleeved on the mounting ring, and a support is arranged in the drainage cylinder; the upper end of the drainage cylinder is a water inlet end, and the lower end of the drainage cylinder is a water outlet end, so that water flow is guided to flow from top to bottom; the filter screen disc is arranged at the water inlet end of the drainage cylinder and is provided with a plurality of filter holes to prevent garbage from passing through water flow; the sewage discharge fan comprises an installation shaft and a plurality of sewage discharge blades, the installation shaft is rotatably inserted in the axis of the filter screen disc, the plurality of sewage discharge blades are axially and uniformly distributed and fixedly installed at the upper end of the installation shaft, the lower end of each sewage discharge blade is attached to the bottom surface of the filter screen disc so as to discharge the garbage blocking the filter holes out of the filter screen disc in the rotating process, and the sewage discharge blades are set to have buoyancy in water flow at least overcoming the part of the impact force of the water flow on the sewage discharge blades; the pollution discharge blade has buoyancy in water flow through a self structure or an external structure, and the buoyancy at least overcomes the part of the impact force of the water flow passing through the pollution discharge blade from top to bottom; the power impeller is arranged in the drainage cylinder, the bottom of the power impeller is rotatably arranged on the bracket and is configured to rotate under the driving of water flow; the power impeller drives the mounting shaft to rotate through a transmission mechanism.

2. A drainage system for sponge city construction according to claim 1 wherein:

the sewage discharge blades are of a hollow structure, and each sewage discharge blade comprises a sewage scraping surface and a back water surface; the dirt scraping surface inclines towards one side, the bottom edge of the dirt scraping surface is tightly contacted with the bottom surface of the filter screen disc and the bottom surface is configured to scoop up the garbage blocking the filter holes; the backing surface is inclined to the other side and is configured to counteract the power generated by the water flow received by the dirt scraping surface.

3. A drainage system for sponge city construction according to claim 2 wherein:

an annular mounting table extends out of the opening of the drainage cylinder horizontally;

the filter screen disc comprises a filter part, a support part and an elastic part; the supporting part is annular and is arranged on the mounting table through a limiting block so as to limit the rotation of the supporting part on the mounting table; the filtering part is disc-shaped and is horizontally arranged at the upper end of the drainage tube; the elastic part is connected with the supporting part and the filtering part and is configured to collect and elongate the garbage on the filtering part so as to enable the filtering part to move downwards; the elastic part allows water flow to pass through; the power impeller is configured to deform under downward pressure of the filter portion so that the power impeller receives a greater force from the water flow.

4. A drainage system for sponge city construction according to claim 3 wherein:

the power impeller comprises a plurality of blades, a connecting shaft and a base; the base comprises a plurality of supporting rods and a bottom ring; the plurality of supporting rods are arranged in an intersecting manner, and the intersection point is positioned on the bracket and rotates; the inner wall of the bottom ring is fixedly connected with two ends of each supporting rod; the connecting shaft is of a hollow columnar structure, the mounting shaft is inserted into the connecting shaft, and the transmission mechanism is a spline mechanism arranged between the mounting shaft and the connecting shaft; the blades are of elastic structures and are obliquely arranged, and the blades are uniformly distributed along the axial direction of the connecting shaft; the upper end of each blade is fixed at the lower end of the connecting shaft, and the lower end of each blade is fixedly connected to the base ring, so that the distance between the connecting shaft and the base is shortened when the filter screen disc moves downwards, and the inclination degree of each blade is changed.

5. A drainage system for sponge city construction according to claim 4 wherein:

the width of the lower end of the blade is larger than that of the upper end.

6. A drainage system for sponge city construction as claimed in claim 5 wherein:

a flow guide table is arranged on the connecting shaft; the diversion table is of a conical annular structure with a small upper end and a large lower end, and is sleeved at the lower end of the connecting shaft.

7. A drainage system for sponge city construction according to claim 3 wherein:

the bracket is composed of two vertical support rods, and the end parts of the support rods are fixed on the inner wall of the drainage tube; the intersection point of the two support rods is positioned on the axis of the drainage cylinder, and a conical convex block with a downward center is arranged above the intersection point; the intersection point of the plurality of supporting rods extends downwards to form a conical groove, the center of the conical groove is sunken upwards, and the conical groove is sleeved on the conical convex block.

8. A drainage system for sponge city construction according to claim 3 wherein:

the outer end of the upper part of the sewage discharge blade extends outwards to form an auxiliary blade; the auxiliary blade comprises a front guide surface and a rear guide surface; the front flow guiding surface is connected with the dirt scraping surface; the rear diversion surface is connected with the back water surface; a gap is formed between the lower end of the pollution discharge blade and the supporting part.

9. A drainage system for sponge city construction according to claim 1 wherein: also comprises a sewage draining pipe;

the upper end of the blow-off pipe is connected with the water outlet end of the drainage cylinder, and the lower end of the blow-off pipe is connected with the water outlet.

Technical Field

The invention relates to the field of road drainage and filtration, in particular to a drainage system for sponge city construction.

Background

In the existing road sewage pipeline device, only a leakage net is additionally arranged at a water outlet of a sewage pipeline, and the filter net is blocked by large garbage such as leaves when accumulated water on a road is discharged. The long-term jam that will cause sewage pipes can make ponding more serious, still needs the manual work to dredge under this kind of the condition of jam, just can make sewage pipes normally work. After ponding filters the completion, need take out the clearance together with rubbish such as leaf together with the filter screen, have rubbish simultaneously along with the together flow direction sewage pipes of ponding, the time has been of a specified duration also can cause the jam of pipeline, increases the clearance cost again.

Disclosure of Invention

The invention provides a drainage system for sponge city construction, which aims to solve the problem that the existing road sewage pipeline is blocked.

The drainage system for sponge city construction adopts the following technical scheme:

a drainage system for sponge city construction comprises a mounting ring, a drainage cylinder, a drainage fan, a filter screen disc and a power impeller; the drainage cylinder is fixedly sleeved on the mounting ring, and a support is arranged in the drainage cylinder; the upper end of the drainage cylinder is a water inlet end, and the lower end of the drainage cylinder is a water outlet end, so that water flow is guided to flow from top to bottom; the filter screen disc is arranged at the water inlet end of the drainage cylinder and is provided with a plurality of filter holes to prevent garbage from passing through water flow; the sewage discharge fan comprises an installation shaft and a plurality of sewage discharge blades, the installation shaft is rotatably inserted in the axis of the filter screen disc, the plurality of sewage discharge blades are axially and uniformly distributed and fixedly installed at the upper end of the installation shaft, the lower end of each sewage discharge blade is attached to the bottom surface of the filter screen disc so as to discharge the garbage blocking the filter holes out of the filter screen disc in the rotating process, and the sewage discharge blades are set to have buoyancy in water flow at least overcoming the part of the impact force of the water flow on the sewage discharge blades; the pollution discharge blade has buoyancy in water flow through a self structure or an external structure, and the buoyancy at least overcomes the part of the impact force of the water flow passing through the pollution discharge blade from top to bottom; the power impeller is arranged in the drainage cylinder, the bottom of the power impeller is rotatably arranged on the bracket and is configured to rotate under the driving of water flow; the power impeller drives the mounting shaft to rotate through a transmission mechanism.

Furthermore, the sewage discharge blades are of hollow structures, and each sewage discharge blade comprises a sewage scraping surface and a back water surface; the dirt scraping surface inclines towards one side, the bottom edge of the dirt scraping surface is tightly contacted with the bottom surface of the filter screen disc and the bottom surface is configured to scoop up the garbage blocking the filter holes; the backing surface is inclined to the other side and is configured to counteract the power generated by the water flow received by the dirt scraping surface.

Furthermore, an annular mounting table horizontally extends outwards from the opening of the drainage cylinder; the filter screen disc comprises a filter part, a support part and an elastic part; the supporting part is annular and is arranged on the mounting table through a limiting block so as to limit the rotation of the supporting part on the mounting table; the filtering part is disc-shaped and is horizontally arranged at the upper end of the drainage tube; the elastic part is connected with the supporting part and the filtering part and is configured to collect and elongate the garbage on the filtering part so as to enable the filtering part to move downwards; the elastic part allows water flow to pass through; the power impeller is configured to deform under downward pressure of the filter portion so that the power impeller receives a greater force from the water flow.

Further, the power impeller comprises a plurality of blades, a connecting shaft and a base; the base comprises a plurality of supporting rods and a bottom ring; the plurality of supporting rods are arranged in an intersecting manner, and the intersection point is positioned on the bracket and rotates; the inner wall of the bottom ring is fixedly connected with two ends of each supporting rod; the connecting shaft is of a hollow columnar structure, the mounting shaft is inserted into the connecting shaft, and the transmission mechanism is a spline mechanism arranged between the mounting shaft and the connecting shaft; the blades are of elastic structures and are obliquely arranged, and the blades are uniformly distributed along the axial direction of the connecting shaft; the upper end of each blade is fixed at the lower end of the connecting shaft, and the lower end of each blade is fixedly connected to the base ring, so that the distance between the connecting shaft and the base is shortened when the filter screen disc moves downwards, and the inclination degree of each blade is changed.

Further, the width of the lower end of the blade is greater than the width of the upper end.

Furthermore, a flow guide table is arranged on the connecting shaft; the diversion table is of a conical annular structure with a small upper end and a large lower end, and is sleeved at the lower end of the connecting shaft.

Furthermore, the bracket is composed of two support rods which are vertical to each other, and the end parts of the support rods are fixed on the inner wall of the drainage tube; the intersection point of the two support rods is positioned on the axis of the drainage cylinder, and a conical convex block with a downward center is arranged above the intersection point; the intersection point of the plurality of supporting rods extends downwards to form a conical groove, the center of the conical groove is sunken upwards, and the conical groove is sleeved on the conical convex block.

Furthermore, the outer end of the upper part of the sewage discharge blade extends outwards to form an auxiliary blade; the auxiliary blade comprises a front guide surface and a rear guide surface; the front flow guiding surface is connected with the dirt scraping surface; the rear diversion surface is connected with the back water surface; a gap is formed between the lower end of the pollution discharge blade and the supporting part.

Further, the drainage system for sponge city construction also comprises a blow-off pipe; the upper end of the blow-off pipe is connected with the water outlet end of the drainage cylinder, and the lower end of the blow-off pipe is connected with the water outlet.

The invention has the beneficial effects that: according to the drainage system for sponge city construction, the filter screen disc can prevent garbage from being continuously discharged downwards along with the direction of water flow. The arrangement of the rotary blowdown fan can eradicate the garbage falling on the filter screen disc and blocking the filter holes, so that the filter holes can keep smooth, and the effect of rapid drainage can be achieved. The blowdown blade has the setting of certain buoyancy, can make when rivers discharge downwards, and rivers decurrent pressure can be offset to buoyancy to reach and reduce the frictional force between blowdown blade and the filter screen dish, prevent that rivers are too big, can not make and scrape dirty face and rotate, prevent promptly that rivers are too big can not clear up rubbish, cause the jam. The power impeller drives the arrangement of the sewage discharge fan, the power of water flow can be fully utilized, and an additional motor is not required to be arranged.

Further, the setting of the elastic part on the filter screen dish, rubbish piles up more and more on the filter house of filter screen dish, and the filtration pore is blockked up gradually, and the water gravity that the filter house received and the gravity of rubbish are bigger and bigger, and then make the elastic part elongated for the filter house drives the blowdown fan and descends. After the filter part is completely blocked, the downward water flow from the gap of the elastic part can not change after reaching a certain speed. Meanwhile, the power impeller is arranged, under the action of gravity of the filter screen disc, the blades are elastically deformed, so that the inclination angles of the blades are changed, the blades are subjected to power increase of water flow, the rotating speed of the power impeller is increased, and the rotating speed of the pollution discharge fan is increased.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural view of an embodiment of a drainage system for sponge city construction according to the present invention;

FIG. 2 is a cross-sectional view of an embodiment of a drainage system for sponge city construction of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is an enlarged view of FIG. 2 at B;

FIG. 5 is a cross-sectional view of a strainer tray of a drainage system for sponge city construction of the present invention;

FIG. 6 is a schematic structural view of a power impeller of a drainage system for sponge city construction according to the present invention;

FIG. 7 is an enlarged view at C of FIG. 6;

fig. 8 is a schematic structural view of a blow-down fan of a drainage system for sponge city construction according to the present invention;

fig. 9 is a sectional view of a drainage blade of a drainage system for sponge city construction according to the present invention;

in the figure: 10. a sewage discharge fan; 101. a sewage discharging blade; 103. scraping dirty surfaces; 104. a water-backed surface; 105. a front flow guide surface; 106. a rear flow guide surface; 107. a key; 108. installing a shaft; 11. a filter screen disc; 111. a spring bar; 112. a cavity; 113. a sewage fan mounting hole; 114. filtering holes; 12. a drain cylinder; 13. a mounting ring; 14. a water outlet end; 15. a blow-off pipe; 16. a powered impeller; 161. a tapered groove; 162. a tapered bump; 163. a strut; 164. a blade; 165. a keyway; 166. a connecting shaft; 167. a flow guide table; 168. a bottom ring; 20. municipal drainage canal.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

An embodiment of the drainage system for sponge city construction of the present invention, as shown in fig. 1 to 9, comprises a mounting ring 13, a drainage cylinder 12, a drainage fan 10, a drainage pipe 15, a strainer tray 11 and a power impeller 16. The drain cylinder 12 is fixedly sleeved on the mounting ring 13, and a support is arranged in the drain cylinder 12. The upper end of the drainage cylinder 12 is a water inlet end, and the lower end is a water outlet end 14, so as to guide the water flow to flow from top to bottom. The filter screen disc 11 is installed at the end of intaking of a drainage tube 12, is equipped with a plurality of filtration pores 114 on the filter screen disc 11 to stop rubbish and make rivers pass through, filter waste water. Blowdown fan 10 includes installation axle 108 and a plurality of blowdown blade 101, installation axle 108 rotationally cartridge is on the blowdown fan mounting hole 113 of filter screen dish 11, a plurality of blowdown blade 101 axial equipartitions fixed mounting are in the upper end of installation axle 108, every blowdown blade 101 lower extreme and the laminating of filter screen dish 11 bottom surface, to can shovel the rubbish that blocks up filter hole 114 from filter screen dish 11 rotating the in-process, reach the effect that the contact is blockked up, and blowdown blade 101 is set up to make to have the buoyancy of the part of overcoming the impact force of rivers to blowdown blade 101 at least in rivers. The dirt discharging blade 101 has a buoyancy in the water flow by its own structure or an external structure, and the buoyancy overcomes at least a portion of the water flow passing through the impact force to the dirt discharging blade 101 from top to bottom, so that the dirt discharging blade 101 does not increase the friction force with the strainer plate 11 by the impact force. A powered impeller 16 is disposed within the drain barrel 12 and is rotatably mounted at the bottom to a support frame configured to rotate in response to the flow of water. The power impeller 16 drives the mounting shaft 108 to rotate through a transmission mechanism. The upper end of the sewage discharge pipe 15 is connected with the water outlet end 14 of the drainage cylinder 12, the lower end of the sewage discharge pipe is connected with the water outlet, the filtered wastewater is recycled, and the device is installed in a municipal drainage channel 20.

In this embodiment, as shown in fig. 8 to 9, the dirt discharging blades 101 have a hollow structure, the hollow part is a cavity 112, and each dirt discharging blade 101 includes a dirt scraping surface 103 and a back surface 104; the dirt scraping surface 103 is inclined to one side, and the bottom edge is in close contact with the bottom surface of the filter screen disk and is configured to scoop up the garbage blocking the filter holes 114. The rear surface 104 is inclined to the other side and is disposed to cancel the power generated by the water flow received by the dirt-scraping surface 103. The effect of the water flow from top to bottom on the back surface 104 causes the sewage discharging blade 101 to have counterclockwise rotation ground power, the effect on the sewage scraping surface 103 causes the disc sewage discharging blade 101 to have clockwise rotation ground power, and the water flow simultaneously acts to be configured to mutually offset the two power.

In this embodiment, as shown in fig. 1 to 6, an annular mounting platform extends horizontally outwards from the opening of the drain cylinder 12. The filter disc 11 comprises a filter portion, a support portion and an elastic portion. The supporting part is annular and is provided with a boss, the mounting platform is provided with a positioning hole, and the mounting platform is mounted on the mounting platform through the positioning hole so as to limit the rotation of the supporting part on the mounting platform. The filter part is in a disc shape and is horizontally installed at the upper end of the drain cylinder 12. The elastic part is connected with the supporting part and the filtering part and is configured to collect and elongate the garbage on the filtering part so as to enable the filtering part to move downwards. Elastic part comprises a plurality of bullet strips 111, and supporting part and filter house are connected to a plurality of bullet strip 111 circumference equipartitions to make the disk body move down under the action of the gravity of the pressure of water and rubbish, the 111 angle grow of bullet strip, the distance grow between supporting part and the filter house, allow rivers to pass through between every bullet strip 111. The powered impeller 16 is configured to deform under the downward pressure of the filter house so that the force from the water flow to which the powered impeller 16 is subjected becomes greater, with a corresponding change in the impeller under different gravitational conditions to which the filter house is subjected.

In the present embodiment, as shown in fig. 2 to 7, the power impeller 16 includes a plurality of blades 164, a connecting shaft 166, and a base; the base comprises a plurality of struts 163 and a bottom ring 168, wherein the struts 163 are arranged in an intersecting manner, and the intersection point is positioned on the bracket to rotate. Inner wall fixed connection in the both ends of every branch 163 of foundation ring 168, connecting axle 166 are hollow columnar structure, and installation axle 108 inserts connecting axle 166, and drive mechanism is for setting up the spline mechanism between installation axle 108 and connecting axle 166, and connecting axle 166 is inside to have vertical keyway 165, and installation axle 108 lower extreme global is equipped with vertical key 107, and keyway 165 and key 107 splined connection make connecting axle 166 can drive installation axle 108 and rotate. The blades 164 are elastic structures and are obliquely arranged, the blades 164 are uniformly distributed along the axial direction of the connecting shaft 166, and the width of the lower ends of the blades 164 is larger than that of the upper ends of the blades. Each blade 164 is fixed at its upper end to the lower end of the connecting shaft 166 and at its lower end to the bottom ring 168, so that when the strainer tray 11 moves downwards, the distance between the connecting shaft 166 and the base is shortened, thereby changing the inclination of the blade 164, the smaller the inclination, the larger the area acted on by the water flow, and the more the power of the power impeller 16 is increased. The connecting shaft 166 is provided with a flow guide platform 167, the flow guide platform 167 is a tapered annular structure with a small upper end and a large lower end, and the flow guide platform 167 is sleeved at the lower end of the connecting shaft 166. In other embodiments, the connecting shaft 166 is fixedly connected to the mounting shaft 108.

In this embodiment, as shown in fig. 2, the bracket is composed of two support rods perpendicular to each other, and the end parts of the support rods are fixed on the inner wall of the drainage tube 12; the intersection point of the two support rods is positioned on the axis of the drainage cylinder 12, and a conical convex block 162 with a downward center is arranged above the intersection point; the intersection point of the plurality of struts 163 extends downwards to form a tapered groove 161, and the center of the tapered groove 161 is recessed upwards and is sleeved on the tapered protrusion 162.

In this embodiment, as shown in fig. 1 to 3 and 8, the upper outer end of the dirt discharging blade 101 is extended outward to form an auxiliary blade, the auxiliary blade can be extended to the edge of the mounting platform, the auxiliary blade comprises a front guide surface 105 and a rear guide surface 106, the front guide surface 105 is connected with the dirt scraping surface 103, and the rear guide surface 106 is connected with the rear water surface 104. There is a gap between the lower end of the filth discharge vane 101 and the support portion, and the gap enables the filth discharge fan 10 to have a space for descending. The front and rear deflector surfaces 105, 106 also have a counteracting dynamic effect, displacing the refuse away from the mounting station.

During operation, when ponding was discharged, there was the through of rivers in the drain cylinder 12, was mingled with great rubbish flow filter screen dish 11 in the rivers, and rubbish is kept out of the sun by filter screen dish 11 to stop on the filter house, ponding is direct to be discharged downwards from the filtration pore. The flow guide 167 directs the water flow so that the water flow impinges the vanes 164 directly to the maximum extent to provide rotational power to the vanes. The power impeller 16 is rotated counterclockwise on the tapered projections 162 on the bracket by the tapered slots 161 under the action of the water flow. The rotation of the power impeller 16 drives the rotation of the mounting shaft 108, and the counterclockwise rotation of the exhaust fan 10 also occurs. Meanwhile, the water flow from top to bottom simultaneously acts on the dirt scraping surface 103 and the back water surface 104, so that the rotation power generated by the dirt scraping surface 103 and the rotation power generated by the back water surface 104 are offset. The counterclockwise rotation of the blow-down fan 10 scoops up the garbage staying on the filter screen tray 11 and discharges the garbage out of the filter screen tray 11 under the continuous rotation, so that the filter holes are kept open. The auxiliary vanes push the waste further away from the screen disc 11.

Rubbish is constantly being filtered by filter screen disc 11 along with rivers, and rubbish is more and more accumulational on filter screen disc 11 for the filtration pore is blockked up, and the velocity of flow of ponding flow through the filtration pore diminishes, but the clearance speed between ponding flow through filter house and the drain cylinder 12 becomes fast, and after the filtration pore is totally blocked up, the clearance speed that ponding flow through between filter house and the drain cylinder 12 is stable. The filter portion receives the pressure of ponding at this in-process bigger and bigger, and then makes the elastic component elongated for the filter portion drives blowdown fan 10 and descends. The inclination of the blades 164 is reduced to provide a larger torque force for the exhaust fan 10, so that the garbage on the filter screen disc 11 is better removed. Because the blowdown blade 101 has certain buoyancy, and the buoyancy of the blowdown blade 101 is equal to the pressure of accumulated water to the blowdown blade 101, the friction between the blowdown blade 101 and the filter screen disc 11 can be reduced. The filtered accumulated water is guided to the barrel through a drain pipe 15 and collected.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.