CN117837473A - Labyrinth runner and drip irrigation emitter - Google Patents
Labyrinth runner and drip irrigation emitter Download PDFInfo
- Publication number
- CN117837473A CN117837473A CN202410206169.6A CN202410206169A CN117837473A CN 117837473 A CN117837473 A CN 117837473A CN 202410206169 A CN202410206169 A CN 202410206169A CN 117837473 A CN117837473 A CN 117837473A
- Authority
- CN
- China
- Prior art keywords
- runner
- labyrinth
- tooth
- flow channel
- shaped structure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002262 irrigation Effects 0.000 title claims abstract description 27
- 238000003973 irrigation Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 abstract description 10
- 239000000126 substance Substances 0.000 abstract description 4
- 239000012530 fluid Substances 0.000 description 10
- 239000013049 sediment Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 239000003337 fertilizer Substances 0.000 description 5
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004088 simulation Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000008485 antagonism Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 229940059082 douche Drugs 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000003621 irrigation water Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011664 nicotinic acid Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
- A01G25/023—Dispensing fittings for drip irrigation, e.g. drippers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Environmental Sciences (AREA)
- Hydraulic Turbines (AREA)
Abstract
The labyrinth runner comprises a water inlet end, a water outlet end and a plurality of runner units connected between the water inlet end and the water outlet end; each runner unit is communicated end to end in sequence and respectively comprises two side walls which are oppositely arranged and a tooth-shaped structure which is formed on each side wall and protrudes inwards, each tooth-shaped structure is respectively provided with two side edges, a space formed by surrounding two adjacent side edges in the two adjacent tooth-shaped structures and two side walls of each runner unit is used as a main runner of the labyrinth runner, a plurality of mutually communicated channels are formed in each tooth-shaped structure and are used as sub runners of the labyrinth runner, and the sub runners are communicated with the main runner. The drip irrigation emitter comprises an emitter body and the labyrinth flow passage formed on the tube wall of the emitter body. The utility model increases the overflow capacity of the labyrinth flow passage while maintaining the hydraulic performance, realizes the non-flow passage siltation and less siltation of the blocking substances, and improves the anti-blocking capacity and the service life of the emitter.
Description
Technical Field
The disclosure belongs to the field of efficient water-saving irrigation technology-drip irrigation, in particular to a labyrinth runner and a drip irrigation emitter, which are suitable for intelligent agriculture water and fertilizer integrated drip irrigation technology and equipment and application and popularization areas thereof.
Background
Drip irrigation is a key technical component of water and fertilizer integration, is a key link for realizing precise irrigation and fertilization and improving the utilization efficiency of water and fertilizer, and is one of effective technologies for developing agricultural water conservation in arid and semiarid areas with shortage of water resources. However, the problem of blocking the emitter seriously increases the use cost of the drip irrigation system and reduces the applicability of system management in irrigation areas, which is always a neck blocking technology in drip irrigation development and restricts the further popularization of the drip irrigation technology. A great deal of scientific researches are conducted on the specific researches from the structural design of the irrigator, the treatment of irrigation water quality and the application of irrigation management technology, and particularly, a great deal of work is conducted on the aspect of the optimal design of the anti-blocking structure of the irrigator. For example, niu Wen designs a full arc labyrinth flow passage dripper (CN 211881494U) through which fine sediment flows but not blocked, wei Zhengying designs a bionic emitter anti-blocking flow passage and emitter (CN 115500135A) based on a fish scale surface microstructure, and the above attempts are all carried out with a certain range of parameter adjustment on the flow passage structure form of the labyrinth flow passage so as to achieve the best sand carrying and filtering capacity, and still have an optimization space. The size of the flow channel of the water irrigator is tiny, so that the water irrigator is very easy to be blocked by solid particles (such as sediment), microorganisms, chemical precipitation, organic matters, fertilizer impurities and the like which flow through the flow channel and are accumulated and developed continuously, and the water irrigator is one of the parts which are most easy to be blocked. The nature of labyrinth flow channel blockage is: when the energy is dissipated, a large amount of energy is dissipated, and the carrying capacity of water flow to impurities is weakened, so that the accumulation and development of blocking substances are caused. The hydraulic performance and the anti-blocking performance of the labyrinth flow channel structure emitter have been considered as a pair of indexes of mutual antagonism for a long time, and the anti-blocking space of the dripper under the guidance of the idea is limited. Therefore, it is highly desirable to create a labyrinth flow channel structure, so as to effectively solve the problems of energy dissipation and particulate matter accumulation and blockage of the labyrinth flow channel under the current situation of water and fertilizer integrated drip irrigation, and the labyrinth flow channel structure is one of key preconditions for comprehensively improving the comprehensive performance of the dripper.
Disclosure of Invention
The present disclosure is directed to solving at least one of the technical problems existing in the prior art.
Therefore, the labyrinth runner and the drip irrigation emitter with the same, which are provided by the disclosure, aim at the problem that the anti-blocking performance and the hydraulic performance of the drip emitter are difficult to improve synchronously, improve the tooth-shaped structure of the existing labyrinth runner, fully develop the important functions of the tooth-shaped structure in aspects of energy dissipation, overflow and containing blocking substances, increase the overflow capacity of the labyrinth runner while maintaining the hydraulic performance, realize non-runner siltation and less siltation of blocking substances, and improve the anti-blocking capacity of the drip irrigation emitter from the runner structural design, thereby prolonging the service life of the drip irrigation emitter.
In order to achieve the above object, the present disclosure adopts the following technical solutions:
the labyrinth runner provided in the first aspect of the present disclosure comprises a water inlet end, a water outlet end and a plurality of runner units connected between the water inlet end and the water outlet end; each runner unit is communicated end to end in turn, each runner unit respectively comprises two side walls which are oppositely arranged and a tooth-shaped structure which is formed on each side wall and protrudes inwards, each tooth-shaped structure is respectively provided with two side edges, the cross section of each tooth-shaped structure is isosceles triangle, the space formed by surrounding the two adjacent side edges in the two adjacent tooth-shaped structures and the two side walls of the runner unit is used as a main runner of the labyrinth runner, a plurality of mutually communicated channels are formed in each tooth-shaped structure and used as sub runners of the labyrinth runner, and the sub runners are communicated with the main runner so as to increase the overflow capacity of the labyrinth runner.
In some embodiments, the tooth-shaped structure is composed of a plurality of side posts and a plurality of additional posts, and gaps are reserved between the adjacent side posts or the additional posts to form the sub-flow channel.
In some embodiments, each side column is a triangular prism and each additional column is the same circular column or diamond column in a single flow channel unit.
In some embodiments, in a single flow channel unit, two or three of said side posts are provided and three of said additional posts are provided.
In some embodiments, the water inlet end is a grid-like water inlet.
In some embodiments, the water outlet end adopts a rectangular water buffering area.
A drip irrigation emitter provided in a second aspect of the present disclosure includes an emitter body and a labyrinth flow passage formed on a tube wall of the emitter body, the labyrinth flow passage employing the labyrinth flow passage according to any one of the embodiments of the first aspect of the present disclosure.
In some embodiments, the overall length x width x height of the drip irrigation emitter is 38.7mm x 8.65mm x 0.5mm, 10 flow channel units are arranged in the labyrinth flow channel, the flow channel depth is 1.2mm, and the tooth spacing of the flow channel units is 3.04mm; two triangular prisms are arranged in the single flow channel unit and are used as side columns, the bottom side length of each triangular prism is 0.25mm, and the tooth height is 0.45mm; three diamond-shaped columns are arranged in the single flow channel unit and serve as the additional columns, and the diagonal length of each diamond-shaped column is 0.25mm and 0.9mm respectively; the width of the sub-runner is 0.12mm.
The present disclosure has the following features and beneficial effects:
the tooth-shaped structure of the existing labyrinth runner is improved, the tooth-shaped structure is designed into a combined structure formed by arranging a plurality of side columns and additional columns at intervals in a nested mode, so that a sub-runner is formed in the tooth-shaped structure, the complexity of the labyrinth runner is increased, the turbulence energy dissipation effect is increased under the condition of the same cross section size of the main runner, and the variable phase of the main runner is prolonged, so that the actual length of a runner unit is effectively reduced; the existence of the sub-runner increases the overflow capacity of the labyrinth runner, can improve the turbulent flow of the back surface of the runner, and reduces the sediment accumulation on the back surface of the runner; the sub-runner can store a part of deposited sediment and delay the blocking amount of the main runner, so that the blocking resistance of the emitter is improved, the service life of the drip irrigation system is prolonged, and the running maintenance management cost of the drip irrigation system is reduced; compared with the tooth-shaped structure of the existing labyrinth runner, the tooth-shaped structure disclosed by the invention has the advantages that the material consumption is less, the length of the whole runner unit is shortened, more than 5% of PVC production raw materials can be saved in a mass production line, the material consumption is saved, and the carbon emission is reduced.
Drawings
Fig. 1 is a schematic three-dimensional structure of a drip emitter according to an embodiment of the present disclosure.
Fig. 2 is a schematic three-dimensional view of the labyrinth flow path in the drip emitter of fig. 1.
Fig. 3 (a) and (b) are schematic cross-sectional views of the labyrinth flow path in the drip emitter of fig. 1, respectively.
Fig. 4 is a schematic view of a structure of a single flow path unit constituting the labyrinth flow path shown in fig. 2.
FIG. 5 is a schematic representation of a three-dimensional model of the internal fluid of a labyrinthine flow passage in an embodiment of the present disclosure.
Fig. 6 (a) and (b) are simulation results of the pressure field and the velocity field, respectively, in the labyrinth flow path according to the embodiment of the present disclosure.
In the figure:
1. a douche body; 2. a water inlet end; 3. a labyrinth flow passage; 4. a flow channel unit; 41. a sidewall; 42. a tooth-shaped structure; 421. a side column; 422. an additional column; 5. a water outlet end; i, a main runner; i1, a runner upstream surface; i2, a runner back surface; II, a sub-runner.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
On the contrary, the application is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the application as defined by the appended claims. Further, in the following detailed description of the present application, specific details are set forth in order to provide a more thorough understanding of the present application. The present application will be fully understood by those skilled in the art without a description of these details.
The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and should not be construed as limiting the scope of the invention, since any structural modifications, proportional changes, or dimensional adjustments, which may be made by those skilled in the art, should not be construed as limiting the scope of the invention without affecting the efficacy or the achievement of the objective of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the present application to which they may be applied, but rather to modify or adapt the relative relationship without materially altering the technical context.
Referring to fig. 1 to 3, a drip irrigation emitter provided in an embodiment of the present disclosure includes an emitter body 1 and a labyrinth flow channel 3 formed on a pipe wall of the emitter body 1;
the labyrinth runner 3 comprises a water inlet end 2, a water outlet end 5 and a plurality of runner units 4 connected between the water inlet end 2 and the water outlet end 5; each runner unit 4 is communicated end to end in turn, each runner unit 4 comprises two opposite side walls 41 and one tooth-shaped structure 42 formed on each side wall 41 and protruding inwards, each tooth-shaped structure 42 is provided with two side edges, the cross section of each tooth-shaped structure is isosceles triangle, the space formed by the adjacent two side edges in the adjacent two tooth-shaped structures 42 and the surrounding of the two side walls 41 is used as a main runner I of the labyrinth runner 3, the main runner I is zigzag, a plurality of mutually communicated channels are formed in each tooth-shaped structure 42 and used as sub-runners II of the labyrinth runner 3, and the sub-runners II are communicated with the main runner I so as to increase the overflow capacity of the labyrinth runner.
In some embodiments, referring to fig. 4, the tooth-shaped structures 42 formed on the side walls 41 of each flow channel unit 4 are identical, and the cross section of each tooth-shaped structure 42 is in an isosceles triangle shape as a whole, that is, the tooth-shaped structure 42 has two side walls, which are respectively located on the flow channel upstream surface i 1 and the flow channel downstream surface i 2. The tooth structure 42 is composed of a plurality of side posts 421 and a plurality of additional posts 422, and gaps are left between the adjacent side posts 421 or additional posts 422 to form the sub-flow channel II. Two or three side posts 421 are arranged in the tooth-shaped structure 42, and the structures of the side posts 421 are the same and are triangular prisms; three additional posts 422 are provided in the tooth structure 42, and each additional post 422 is identical in structure (identical in size and cross-sectional form) and may be a circular post or a diamond post. In this embodiment, the tooth-shaped structure 42 is composed of two triangular prisms as the side posts 421 and three diamond-shaped posts as the additional posts 422, wherein the two triangular prisms are arranged on the side wall 41 at intervals, and the three diamond-shaped posts are uniformly distributed between the two triangular prisms in the tooth-shaped structure 42, that is, the nested form is formed between the diamond-shaped posts and the triangular prisms, thereby forming the triangular tooth-shaped structure 42.
Further, in this embodiment, the overall length x width x height of the drip irrigation emitter is 38.7mm x 8.65mm x 0.5mm, the labyrinth flow channel structure includes 10 unit flow channels in total, the flow channel depth is 1.2mm, and the tooth pitch of the flow channel units is 3.04mm; in the single flow channel unit, the number of triangular prisms is 2, the bottom side length is 0.25mm, and the tooth height is 0.45mm; in the single flow channel unit, the number of diamond-shaped columns is 3, the diagonal lengths are 0.25mm and 0.9mm respectively, and the sub-flow channel width is 0.12mm. The number of the water inlet grids is 14, and the length and the width of each single grid are respectively 1mm and 0.96mm.
In some embodiments, the water inlet end 2 is a grid-like water inlet to filter larger impurities in the fluid entering the labyrinth flow passage 3. The water outlet end 5 adopts a rectangular water slowing area, the size of the water outlet water slowing area is 4.6mm×4.6mm, and the water outlet of the pipe wall is a circular hole with the diameter of 2mm.
The movement direction of the fluid in this embodiment is: the fluid is filtered from the pipeline through the grid-shaped water inlet end 2 and enters the labyrinth flow channel 3, and when the fluid passes through the tooth-shaped structure 42, the fluid is divided into two parts, one part flows away from the main flow channel I, the other part flows away from the sub-flow channel II, so that the fluid continuously flows from one flow channel unit to the next flow channel unit, and finally drops out of the labyrinth flow channel at the circular hole of the water slowing area.
The working principle of the tooth-shaped structure in the embodiment is as follows: the tooth-shaped structure increases the complexity of the labyrinth runner, increases the turbulent energy dissipation effect under the same runner section size, and can effectively reduce the length of the runner unit; the existence of the sub-runner II increases the overflow capacity of the labyrinth runner, can improve the turbulent turbulence of the vortex of the runner back surface II 2 and reduces the sediment accumulation of the runner back surface II 2; in addition, the sub-runner II can store a part of deposited sediment, and delay the blocking amount of the main runner I, so that the blocking resistance of the emitter is improved.
In order to verify the effectiveness of the embodiment of the disclosure, a numerical simulation is performed on the emitter of the embodiment, fluid in a runner is constructed according to the size of a labyrinth runner dripper by means of an ANASYS Workbench tool, calculation grid division is performed, the constructed model is shown in fig. 5, the pressure of a water inlet and a water outlet is set to be 100kPa and 0kPa, and a k-epsilon model is adopted for performing simulation calculation to obtain the turbulence energy and speed distribution rule of the fluid in the runner, as shown in fig. 6 (a) and (b). The result shows that the fluid in the water facing area of the main runner enters the sub-runner due to the nested tooth-shaped structure and the sub-runner structure, so that a very remarkable turbulent energy dissipation phenomenon is generated; the back water area of the main runner is affected by the water coming from the sub-runner, and has a remarkable high-flow-rate area distribution.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present disclosure have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the disclosure, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The labyrinth runner is characterized by comprising a water inlet end, a water outlet end and a plurality of runner units connected between the water inlet end and the water outlet end; each runner unit is communicated end to end in turn, each runner unit respectively comprises two side walls which are oppositely arranged and a tooth-shaped structure which is formed on each side wall and protrudes inwards, each tooth-shaped structure is respectively provided with two side edges, the cross section of each tooth-shaped structure is isosceles triangle, the space formed by surrounding the two adjacent side edges in the two adjacent tooth-shaped structures and the two side walls of the runner unit is used as a main runner of the labyrinth runner, a plurality of mutually communicated channels are formed in each tooth-shaped structure and used as sub runners of the labyrinth runner, and the sub runners are communicated with the main runner so as to increase the overflow capacity of the labyrinth runner.
2. The labyrinth flow path as claimed in claim 1, wherein said tooth structure is comprised of a plurality of side posts and a plurality of additional posts, with gaps between adjacent ones of said side posts or said additional posts forming said sub-flow path.
3. The labyrinth flow path as claimed in claim 2, wherein each side column in a single flow path unit is a triangular prism and each additional column is the same circular column or diamond column.
4. The labyrinth flow path as claimed in claim 2, wherein two or three of said side posts and three of said additional posts are provided in a single flow path unit.
5. The labyrinth flow passage as in claim 1, wherein said water inlet end is a grid-like water inlet.
6. The labyrinth flow passage as in claim 1, wherein said water outlet end employs a rectangular water buffer zone.
7. A drip irrigation emitter comprising an emitter body and a labyrinthine runner formed in a wall of the emitter body, the labyrinthine runner employing the labyrinthine runner according to any one of claims 1 to 6.
8. The drip irrigation emitter of claim 7 wherein the overall length x width x height of the drip irrigation emitter is 38.7mm x 8.65mm x 0.5mm, 10 flow channel units are provided in the labyrinth flow channel, the flow channel depth is 1.2mm, and the tooth spacing of the flow channel units is 3.04mm; two triangular prisms are arranged in the single flow channel unit and are used as side columns, the bottom side length of each triangular prism is 0.25mm, and the tooth height is 0.45mm; three diamond-shaped columns are arranged in the single flow channel unit and serve as the additional columns, and the diagonal length of each diamond-shaped column is 0.25mm and 0.9mm respectively; the width of the sub-runner is 0.12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410206169.6A CN117837473A (en) | 2024-02-26 | 2024-02-26 | Labyrinth runner and drip irrigation emitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410206169.6A CN117837473A (en) | 2024-02-26 | 2024-02-26 | Labyrinth runner and drip irrigation emitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117837473A true CN117837473A (en) | 2024-04-09 |
Family
ID=90546505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410206169.6A Pending CN117837473A (en) | 2024-02-26 | 2024-02-26 | Labyrinth runner and drip irrigation emitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117837473A (en) |
-
2024
- 2024-02-26 CN CN202410206169.6A patent/CN117837473A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102583759B (en) | Cascaded combined-flow artificial wetland system and sewage ecological purifying method thereof | |
| CN103953014B (en) | fishway structure | |
| CN117837473A (en) | Labyrinth runner and drip irrigation emitter | |
| CN110140635B (en) | Emitter based on annular complementary flow channel | |
| CN210959756U (en) | Double-filtering double-flow-channel anti-blocking water dropper | |
| CN216839294U (en) | Compound ecological dam | |
| CN1214870C (en) | Flow-state based microperfusion irrigator anti-blocking flow-path designing method | |
| CN215290540U (en) | High-flow high-fall energy dissipation drop well structure | |
| CN211881494U (en) | Full arc maze runner dripper with fine silt flowing through without blockage | |
| CN211430374U (en) | Three-way flow dividing and bypassing flow channel and emitter based on flow channel | |
| CN110607787B (en) | Arrangement method of side dispersed water supplementing system of fish collecting system at fishway inlet | |
| CN111395278A (en) | Continuous flow guiding and energy dissipating type spillway and arc-shaped force dissipating pier | |
| CN217128119U (en) | Ecological fish passing facility for river old sidewalk and wetland system | |
| CN107510973B (en) | A kind of filter lamination | |
| CN205711789U (en) | A kind of road cross a river culvert being conducive to water drainage | |
| CN115500135B (en) | Bionic water-filling device anti-blocking flow channel based on fish scale surface microstructure and water-filling device | |
| CN106145313A (en) | A kind of radial-flow water ecology cleaning system | |
| CN217939262U (en) | Built-in desilting basin of dam rolls | |
| CN115536099B (en) | Water body purifying device | |
| CN110713324A (en) | Ecological filter dam based on efficient in-situ interception of pollutants and application thereof | |
| CN105366818B (en) | A kind of composite water purifying surface-flow system | |
| CN219174342U (en) | Multi-channel different-direction-flow constructed wetland | |
| CN212248137U (en) | Continuous diversion energy dissipation type spillway, arc-shaped force dissipation pier and energy dissipation unit | |
| CN113906981B (en) | Vortex cavity type drip irrigation emitter | |
| CN211735240U (en) | River network flow increasing and quality improving system for plain polder area |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |