CN212294521U - Compound 30 fan-shaped pump station bend side slope flow state devices that improves - Google Patents
Compound 30 fan-shaped pump station bend side slope flow state devices that improves Download PDFInfo
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- CN212294521U CN212294521U CN202020910000.6U CN202020910000U CN212294521U CN 212294521 U CN212294521 U CN 212294521U CN 202020910000 U CN202020910000 U CN 202020910000U CN 212294521 U CN212294521 U CN 212294521U
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Abstract
The utility model relates to a composite 30-degree fan-shaped flow state device for improving the slope of a bend of a pump station, which comprises a fan-shaped rectifying device, wherein the fan-shaped rectifying device is arranged at the bend of a lateral water inlet flow passage of the pump station; the fan-shaped rectifying device comprises 5 guide grids and a grid, wherein the 5 guide grids are respectively a first guide grid, a second guide grid, a third guide grid, a fourth guide grid and a fifth guide grid; the front ends and the tail ends of the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid are respectively provided with a grid, one end of each grid is fixed on a side slope of a curve of a lateral water inlet channel of the pump station, and the other end of each grid is fixed on the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid. Through the utility model discloses, improved the flow state problem and the velocity of flow distribution of bend side slope department, shortened the adjustment distance that sharp changeover portion velocity of flow distributes greatly.
Description
Technical Field
The utility model relates to a compound 30 fan-shaped pump station bend side slope flow state devices that improves belongs to the hydraulic engineering field.
Background
Limited by engineering arrangement, certain newly-built pump station engineering can only adopt the side direction pump station of intaking. However, a series of backflow is easily formed at the side slope of the curve of the lateral water inlet pump station, and a low-speed water flow area is generated, so that the water inlet condition of the water pump is poor. The flow velocity distribution of water flow at the bend of the lateral water inlet pump station is generally determined by the ranges of a vortex area and a low-speed area at a side slope. The distance of the adjusting section for recovering the normal flow velocity distribution of the water flow after the water flow is bent is long. Therefore, a fan-shaped flow state improving measure is additionally arranged at the side water inlet bend, which is beneficial to reducing the range of the vortex and the low-speed area at the side slope, so that the flow speed of the over-bent water flow can be restored to a normal distribution state in a short transition section.
SUMMERY OF THE UTILITY MODEL
The utility model aims at the problem that above-mentioned prior art exists, aim at low-speed district, the backward flow district that appears to side direction intake pump station bend side slope department, provide a compound 30 fan-shaped pump station bend side slope flow state devices that improves.
The utility model aims at realizing the above, a composite 30-degree fan-shaped device for improving the flow state of the side slope of the bend of the pump station, which is characterized in that the device comprises a fan-shaped rectifying device, and the fan-shaped rectifying device is arranged at the bend of the lateral water inlet flow passage of the pump station;
the fan-shaped rectifying device comprises 5 guide grids and a grid, wherein the 5 guide grids are respectively a first guide grid, a second guide grid, a third guide grid, a fourth guide grid and a fifth guide grid;
setting the depth of a lateral water inlet flow channel of a front pool water pump station of a lateral water inlet pump station as h, and the diameter of a water pump impeller in the pump station as D;
the distance between the first flow guide grid and the side slope of the curve of the lateral water inlet channel of the pump station is 1.4D, the distance between the first flow guide grid and the second flow guide grid is 1.6D, the distance between the second flow guide grid and the third flow guide grid is 1.8D, the distance between the third flow guide grid and the fourth flow guide grid is 2.0D, and the distance between the fourth flow guide grid and the fifth flow guide grid is 2.2D; the arrangement angles of the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid are all 30 degrees, and the heights are all h;
the front ends and the tail ends of the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid are respectively provided with a grid, one end of each grid is fixed on a side slope of a curve of a lateral water inlet channel of the pump station, and the other end of each grid is fixed on the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid.
The grating is formed by crossing a plurality of transverse grating strips and a plurality of vertical grating strips.
The first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid and the fifth flow guide grid are all in the shape of guide vanes with thin parallel cylindrical surfaces.
A use method of a 30-degree combined fan-shaped device for improving the flow state of a side slope of a bend of a pump station is characterized by comprising a fan-shaped rectifying device, wherein the fan-shaped rectifying device is arranged at the bend of a lateral water inlet flow passage of the pump station;
the water flow entering the bend of the lateral water inlet channel of the pump station flows back through the first flow guide grid, the second flow guide grid, the third flow guide grid, the fourth flow guide grid, the fifth flow guide grid and the grids of the fan-shaped rectifying device to be rectified, regulated and controlled, the flow velocity distribution is improved, the flow shedding position and range of the water flow are controlled, the formation of the back flow is controlled, and the flow velocity distribution of the water flow is improved;
the water flow is uniformly divided after passing through the front-end grating, the momentum of the water flow is uniformly distributed, the first flow guide grating, the second flow guide grating, the third flow guide grating, the fourth flow guide grating and the fifth flow guide grating play a role in guiding and steering the water flow, meanwhile, the first flow guide grating, the second flow guide grating, the third flow guide grating, the fourth flow guide grating and the fifth flow guide grating provide extra centripetal force for the water flow, the flow speed difference between the inner side and the outer side is reduced, the backflow problem at the inner side slope of the curve of the lateral water inlet channel of the pump station is solved, and the longitudinal flow speed of the water flow passing through the first flow guide grating, the second flow guide grating, the third flow guide grating, the fourth flow guide grating and the fifth flow guide grating is rapidly recovered to be normally distributed by the tail-end grating.
The utility model discloses rational in infrastructure, manufacturing are easy, convenient to use, through the utility model discloses, a compound 30 fan-shaped pump station bend side slope flow state devices that improves that provide, the device sets up in pump station side direction water inlet channel bend department, and the device includes 5 water conservancy diversion bars and a plurality of grids. The pump station side direction inlet channel depth of water h, water pump impeller diameter is D. The guide grids (including a first guide grid, a second guide grid, a third guide grid, a fourth guide grid and a fifth guide grid) adopt a guide vane shape of a thin parallel cylindrical surface. According to the principle that the water conservancy diversion bars interval increases gradually from the inside wall to the lateral wall interval, the utility model discloses the interval of well 5 water conservancy diversion bars is 1.4D, 1.6D, 1.8D, 2.0D, 2.2D respectively. The setting angles of the 5 guide grids are all 30 degrees, and the heights are all h. The grids are arranged at the front end and the tail end of the flow guide grid. And in the transverse direction, one end of each grid is fixed on the side slope through a grid groove, the other end of each grid is fixed on the 5 th flow guide grid (the fifth flow guide grid), and the distance between every two grids is uniformly distributed.
Has the advantages that: this utility model discloses can change the side slope condition, improve the flow state problem and the velocity distribution of flow of bend side slope department, shorten the adjustment distance of sharp changeover portion velocity distribution of flow greatly. Compared with the traditional rectification mode, the utility model discloses a can effectively break the circulation, adjust the speed of flow distribution after bending, make the rivers distribution between each water conservancy diversion bars more even to improve the operating efficiency of pump station widely.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a middle segment fairing of the present invention;
FIG. 3 is a schematic structural view of a middle segment fairing of the present invention;
FIG. 4 shows the water flow without the addition of the device of the present invention;
FIG. 5 illustrates the flow conditions with the addition of the device of the present invention;
in the figure: 1 first flow guiding grid, 2 second flow guiding grid, 3 third flow guiding grid, 4 fourth flow guiding grid, 5 fifth flow guiding grid, 6 grid and 7 side slope.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and the accompanying description.
A30-degree combined fan-shaped device for improving the flow state of a side slope of a bend of a pump station is characterized by comprising a fan-shaped rectifying device, wherein the fan-shaped rectifying device is arranged at the bend of a lateral water inlet flow passage of the pump station;
the fan-shaped rectifying device comprises 5 guide grids and a grid 6, wherein the 5 guide grids are respectively a first guide grid 1, a second guide grid 2, a third guide grid 3, a fourth guide grid 4 and a fifth guide grid 5;
setting the depth of a lateral water inlet flow channel of a front pool water pump station of a lateral water inlet pump station as h, and the diameter of a water pump impeller in the pump station as D;
the distance between the first flow guide grid (1) and the side slope of the lateral water inlet runner bend of the pump station is 1.4D, the distance between the first flow guide grid (1) and the second flow guide grid (2) is 1.6D, the distance between the second flow guide grid (2) and the third flow guide grid (3) is 1.8D, the distance between the third flow guide grid (3) and the fourth flow guide grid (4) is 2.0D, and the distance between the fourth flow guide grid (4) and the fifth flow guide grid (5) is 2.2D; the arrangement angles of the first flow guide grid 1, the second flow guide grid 2, the third flow guide grid 3, the fourth flow guide grid 4 and the fifth flow guide grid 5 are all 30 degrees, and the heights are all h; the front ends and the tail ends of the first flow guide grid 1, the second flow guide grid 2, the third flow guide grid 3, the fourth flow guide grid 4 and the fifth flow guide grid 5 are respectively provided with a grid 6, one end of each grid 6 is fixed on a side slope of a curve of a lateral water inlet channel of the pump station, and the other end of each grid 6 is fixed on the first flow guide grid 1, the second flow guide grid 2, the third flow guide grid 3, the fourth flow guide grid 4 and the fifth flow guide grid 5.
The grating 6 is formed by crossing a plurality of transverse grating strips and a plurality of vertical grating strips. The first flow guide grid 1, the second flow guide grid 2, the third flow guide grid 3, the fourth flow guide grid 4 and the fifth flow guide grid 5 are all in the shape of guide vanes with thin parallel cylindrical surfaces.
When in use, the fan-shaped rectifying device is arranged at the bend of the lateral water inlet flow passage of the pump station; the water flow entering the bend of the lateral water inlet channel of the pump station flows back through the first flow guide grid 1, the second flow guide grid 2, the third flow guide grid 3, the fourth flow guide grid 4, the fifth flow guide grid 5 and the grid 6 of the fan-shaped rectifying device, so that the flow velocity distribution is improved, the flow shedding position and range of the water flow are controlled, the formation of the backflow is controlled, and the flow velocity distribution of the water flow is improved.
The water flow is uniformly divided after passing through the front-end grating 6, the momentum of the water flow is uniformly distributed, the first flow guide grating 1, the second flow guide grating 2, the third flow guide grating 3, the fourth flow guide grating 4 and the fifth flow guide grating 5 play a role in guiding and steering the water flow, meanwhile, the first flow guide grating 1, the second flow guide grating 2, the third flow guide grating 3, the fourth flow guide grating 4 and the fifth flow guide grating 5 provide extra centripetal force for the water flow, the difference of the flow speed of the inner side and the outer side is reduced, and therefore the backflow problem at the inner side slope of the curve of the lateral water inlet channel of the pump station is solved, and the longitudinal flow speed of the water flow passing through the first flow guide grating 1, the second flow guide grating 2, the third flow guide grating 3, the fourth flow guide grating 4 and the fifth flow guide grating 5 is rapidly recovered to be normally distributed by the tail-.
In the device, a first flow guide grid 1, a second flow guide grid 2, a third flow guide grid 3, a fourth flow guide grid 4, a fifth flow guide grid 5 and a grid 6 adopt prefabricated reinforced concrete members or metal members and have enough rigidity.
As shown in fig. 3, the incoming flow of the side intake water tends to be biased to the outside of the curve by inertia, so that the pressure at the inside of the curve increases, while the pressure at the outside decreases, and a backflow region and a low-speed region are easily formed at the slope of the curve.
The method is obtained through a large number of tests and numerical simulation calculation, backflow can be effectively controlled by arranging a composite 30-degree fan-shaped rectification measure at the bend, the flow velocity distribution of water flow is improved, and the efficiency of a water pump system is improved, as shown in fig. 4.
Claims (3)
1. A30-degree combined fan-shaped device for improving the flow state of a side slope of a bend of a pump station is characterized by comprising a fan-shaped rectifying device, wherein the fan-shaped rectifying device is arranged at the bend of a lateral water inlet flow passage of the pump station;
the fan-shaped rectifying device comprises 5 guide grids and a grid (6), wherein the 5 guide grids are respectively a first guide grid (1), a second guide grid (2), a third guide grid (3), a fourth guide grid (4) and a fifth guide grid (5);
setting the depth of a lateral water inlet flow channel of a pump station as h, and the diameter of a water pump impeller in the pump station as D;
the distance between the first flow guide grid (1) and the side slope of the lateral water inlet runner bend of the pump station is 1.4D, the distance between the first flow guide grid (1) and the second flow guide grid (2) is 1.6D, the distance between the second flow guide grid (2) and the third flow guide grid (3) is 1.8D, the distance between the third flow guide grid (3) and the fourth flow guide grid (4) is 2.0D, and the distance between the fourth flow guide grid (4) and the fifth flow guide grid (5) is 2.2D; the arrangement angles of the first flow guide grid (1), the second flow guide grid (2), the third flow guide grid (3), the fourth flow guide grid (4) and the fifth flow guide grid (5) are all 30 degrees, and the heights are all h;
the front ends and the tail ends of the first flow guide grid (1), the second flow guide grid (2), the third flow guide grid (3), the fourth flow guide grid (4) and the fifth flow guide grid (5) are respectively provided with a grid (6), one end of each grid (6) is fixed on a side slope of a lateral water inlet channel bend of a pump station, and the other end of each grid (6) is fixed on the first flow guide grid (1), the second flow guide grid (2), the third flow guide grid (3), the fourth flow guide grid (4) and the fifth flow guide grid (5).
2. The device for improving the flow state of the side slope of the bend of the pump station in a combined 30-degree fan shape according to claim 1, wherein the grating (6) is formed by crossing a plurality of transverse grating bars and a plurality of vertical grating bars.
3. The device for improving the flow state of the side slope of the bend of the pump station in a combined 30-degree fan shape according to claim 1, wherein the first flow guide grid (1), the second flow guide grid (2), the third flow guide grid (3), the fourth flow guide grid (4) and the fifth flow guide grid (5) are all in the shape of guide vanes with thin parallel cylindrical surfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020910000.6U CN212294521U (en) | 2020-05-26 | 2020-05-26 | Compound 30 fan-shaped pump station bend side slope flow state devices that improves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020910000.6U CN212294521U (en) | 2020-05-26 | 2020-05-26 | Compound 30 fan-shaped pump station bend side slope flow state devices that improves |
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| Publication Number | Publication Date |
|---|---|
| CN212294521U true CN212294521U (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020910000.6U Active CN212294521U (en) | 2020-05-26 | 2020-05-26 | Compound 30 fan-shaped pump station bend side slope flow state devices that improves |
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| CN (1) | CN212294521U (en) |
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- 2020-05-26 CN CN202020910000.6U patent/CN212294521U/en active Active
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