CN106076986B - Hollow billet air water combination rinse-system and method for the direct trickle irrigation of high sand-carrying water - Google Patents
Hollow billet air water combination rinse-system and method for the direct trickle irrigation of high sand-carrying water Download PDFInfo
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- CN106076986B CN106076986B CN201610405525.2A CN201610405525A CN106076986B CN 106076986 B CN106076986 B CN 106076986B CN 201610405525 A CN201610405525 A CN 201610405525A CN 106076986 B CN106076986 B CN 106076986B
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
- B08B9/0328—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid by purging the pipe with a gas or a mixture of gas and liquid
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning In General (AREA)
- Sewage (AREA)
Abstract
The present invention provides a kind of hollow billet air water combination rinse-systems and method for the direct trickle irrigation of high sand-carrying water, wherein：It is connected with air compressor by the gas pipeline with the first valve on aqueduct between water pump and water distributor；Gas-water turbulent flow mixer is communicated on aqueduct between gas pipeline and water distributor side by side, gas-water turbulent flow mixer both ends are equipped with the second valve and third valve；4th valve and the 5th valve are installed on the aqueduct being connected to side by side with gas-water turbulent flow mixer.The rinse-system of the present invention combines washing and air purge, reduces the waste of water resource, and the hydrodynamic cleaning effect of drip irrigation pipe tail end.High pressure gas and the high-velocity flow flow-disturbing in gas-water turbulent flow mixer mix, and are conducive to impact the condensed state sand grain for being deposited on drip irrigation pipe bottom and be sufficiently mixed with mixing wastewater with air stream.
Description
Technical field
The invention belongs to trickle irrigation fields, are related to drip irrigation system, and in particular to a kind of hair for the direct trickle irrigation of high sand-carrying water
Pipe air water combination rinse-system and method.
Background technology
China be an available water resource there is a serious shortage of country, although water resource gross reserves very abundant, water per capita
Stock number is but only a quarter of world average level.Meanwhile there are still water resource profits in China agricultural water resource utilization field
With less efficient, the serious outstanding problem of waste.Based on above-mentioned China's situation of water resource and agricultural water resource utilization field
There are the problem of, the agricultural irrigation mode of Popularization And Development high-efficiency water-saving, improve agricultural water utilization rate it is imperative.Trickle irrigation conduct
A kind of Novel irrigation mode of rising in recent years, opposite traditional irrigation mode have the advantages that water-saving, energy saving, efficient.So
Northwest China drought and water-scarce area is promoted and development farmland drip irrigation technology, can largely improve agricultural water utilization
Rate alleviates the short crisis of water resource.
Northwest China inland Yellow River irrigation, traditional agricultural production is mainly using Huanghe water as iirigation water source.Due to trickle irrigation
System is higher to trickle irrigation water source water quality requirement, by still having part sand grain to enter drip irrigation system in pretreated trickle irrigation water source
In, it is deposited in drip irrigation system with the increase sand grain of trickle irrigation number, pipeline discharge area can be caused to reduce at leisure, directly
To blocking hollow billet and water dropper so that entire drip irrigation system is affected.Therefore, the sand setting in droping irrigating pipe is solved the problems, such as, in time
Ground excludes sand grain, then can efficiently reduce the generation of drip irrigation system clogging.
For the sand grain being deposited in drip irrigation system, the method for generally use hydrodynamic cleaning is handled.Waterpower is rushed
It washes i.e. after a trickle irrigation work period of drip irrigation system, it is logical using trickle irrigation water pump by drip irrigation pipe tail end valve opening
Enter trickle irrigation water source, the silt for being deposited on hollow billet bottom is rinsed by discharge drip irrigation system by the flow of high-speed motion, reaches cleaning
Drip irrigation system, the purpose for excluding silt.But there are shortcomings, such as water resource waste for this simple method using hydrodynamic cleaning
More serious, the trickle irrigation raw water used in each flushing process accounts for the 10% of system normal operation a cycle institute water requirement, by
In not taking necessary flushing water to collect measure in the end of drip irrigation pipe so that the region of drip irrigation pipe end eventually forms
The flood irrigation region of approximate traditional flood irrigation mode.In addition the flushing of this simple drip irrigation system cleaning mode by hydrodynamic cleaning
Intensity can so that the turbulence intensity for rinsing flow gradually weakens with hair in-pipe flow along the movement of drip irrigation pipe, and drip irrigation system
It is more to show as capillary end deposition quantity more for silt sediment quantity in middle hollow billet, and rinse when flow moves to capillary end by
In the decrease of water turbulence intensity the effect appearance of hydrodynamic cleaning is largely decayed.
Invention content
In view of the deficiencies of the prior art, the present invention intends to provide the hair for the direct trickle irrigation of high sand-carrying water
Pipe air water combination rinse-system and method solve water resource waste in existing simple water flushing process, drip irrigation pipe tail end
The poor technical problem of hydrodynamic cleaning effect.
In order to solve the above-mentioned technical problem, the present invention is realised by adopting the following technical scheme：
A kind of hollow billet air water combination rinse-system for the direct trickle irrigation of high sand-carrying water, including water pump, water pump pass through water delivery
Pipeline is connected with the water distributor of drip irrigation zone, and the drip irrigation zone includes a plurality of drip irrigation pipe, the head of a plurality of drip irrigation pipe
End is connected by water distributor, and the tail end of a plurality of drip irrigation pipe is connected by rinsing sludge pipe；
Pass through gas pipeline and air compressor phase with the first valve on aqueduct between water pump and water distributor
Connection；
Gas-water turbulent flow mixer, gas-water turbulent flow mixing are communicated on aqueduct between gas pipeline and water distributor side by side
Device both ends are equipped with the second valve and third valve；It is equipped with the 4th on the aqueduct being connected to side by side with gas-water turbulent flow mixer
Valve and the 5th valve.
The present invention also has following distinguishing feature：
The gas-water turbulent flow mixer includes cylinder, and cylinder one end is connected with the end that becomes a mandarin, the cylinder other end with go out stream
End is connected, and multiple turbulent baffles are provided in cylinder.
The turbulent baffle is Semicircular baffle, and along the axial direction of cylinder, staggered is uniformly set multiple turbulent flow baffles successively
It sets.
One end of the flushing sludge pipe is connected with muddy water collecting pit, rinses the row of being provided on the other end of sludge pipe
Air valve.
The tail end of a plurality of anti-clogging drip irrigation hollow billet is by rinsing mud valve and bridge piece and rinsing sludge pipe
Connection.
It is additionally provided with vacuum tank between the air compressor and gas pipeline.
The water pump and air compressor is connected with control terminal.
A kind of hollow billet air water combination purging method for the direct trickle irrigation of high sand-carrying water, it is characterised in that：This method uses
The hollow billet air water combination rinse-system as described above for being used for the direct trickle irrigation of high sand-carrying water, the gas transmission in air water combination flushing process
Pressure in pipeline is more than the pressure in aqueduct.
Compared with prior art, the present invention having the following technical effect that：
The rinse-system of the present invention combines washing and air purge, reduces the waste of water resource, and drip irrigation pipe tail end
Hydrodynamic cleaning effect.High pressure gas and the high-velocity flow flow-disturbing in gas-water turbulent flow mixer mix, and are conducive to that trickle irrigation will be deposited on
The condensed state sand grain of hollow billet bottom is impacted and is sufficiently mixed with air-water mixed flow.
The turbulent fluctuation feelings of traditional simple itself kinetic energy of the clean method flow of drip irrigation system and flow by hydrodynamic cleaning
Condition decay with the increase of move distance it is apparent, and the mixing wastewater with air stream in the present invention when being cleaned to pipeline mixed flow it is disorderly
Intensity of flow is decayed with the increase of move distance there is no apparent, to significantly improve mixing wastewater with air stream to sinking in drip irrigation pipe
The constant impingement intensity of deposition sand, it will be apparent that improve the cleaning effect to silt sediment in drip irrigation system.
Description of the drawings
Fig. 1 is the overall structure diagram of present system.
Fig. 2 is the structural schematic diagram of gas-water turbulent flow mixer.
Fig. 3 is the connection relationship diagram of drip irrigation pipe tail end.
Fig. 4 is the motion state schematic diagram of air-water-sand in drip irrigation pipe under flushing state.
The meaning of each label is in figure：1- water pumps, 2- aqueducts, the drip irrigation zones 3-, 4- gas pipelines, the compression of 5- air
Machine, 6- gas-water turbulent flow mixers, the first valves of 7-, the second valves of 8-, 9- third valves, the 4th valves of 10-, the 5th valves of 11-,
12- muddy water collecting pits, 13- vacuum tanks, 14- control terminals, 15- flowing gas, 16- muddy water mixed flows, 17-Y type filters,
18- pressure gauges, 19- air bleeding valves；
(3-1)-drip irrigation pipe, (3-2)-water distributor, (3-3)-rinse sludge pipe, and (3-4)-rinses mud valve, (3-5)-
Bridge piece；
(6-1)-cylinder, (6-2)-become a mandarin end, and (6-3)-goes out to flow end, (6-4)-turbulent flow baffle.
Explanation is further explained in detail to the particular content of the present invention below in conjunction with attached drawing.
Specific implementation mode
Specific embodiments of the present invention are given below, it should be noted that the invention is not limited in implement in detail below
Example, all equivalent transformations made on the basis of the technical solutions of the present application each fall within protection scope of the present invention.
Embodiment 1：
The present embodiment provides a kind of hollow billet air water combination rinse-system for the direct trickle irrigation of high sand-carrying water, such as Fig. 1 to Fig. 3
It is shown, including water pump 1, water pump 1 be connected by aqueduct 2 with the water distributor 3-2 of drip irrigation zone 3, the drip irrigation zone 3 includes more
The head end of drip irrigation pipe 3-1, a plurality of drip irrigation pipe 3-1 are connected by water distributor 3-2, a plurality of drip irrigation pipe 3-1's
Tail end is connected by rinsing sludge pipe 3-3；
Pass through gas pipeline 4 and air pressure with the first valve 7 on aqueduct 2 between water pump 1 and water distributor 3-2
Contracting machine 5 is connected；
It is communicated with gas-water turbulent flow mixer 6 side by side on aqueduct 2 between gas pipeline 4 and water distributor 3-2, air water is disorderly
6 both ends of stream mixer are equipped with the second valve 8 and third valve 9；The aqueduct 2 being connected to side by side with gas-water turbulent flow mixer 6
On the 4th valve 10 and the 5th valve 11 are installed.
Gas-water turbulent flow mixer 6 includes cylinder 6-1, and the one end cylinder 6-1 is connected with the end 6-2 that becomes a mandarin, the cylinder 6-1 other ends
It is connected with going out to flow end 6-3, multiple turbulent baffle 6-4 is provided in cylinder 6-1.
Turbulent baffle 6-4 be Semicircular baffle, multiple turbulent flow baffle 6-4 along cylinder 6-1 axial a positive and a negative successively
Staggered is uniformly arranged.Gas-water turbulent flow mixer 6 is disturbed gas and flow by the turbulent baffle 6-4 of internal interlaced arrangement
It is dynamic, realize being sufficiently mixed for high pressure gas and high-velocity flow, there are gaps, turbulent baffle 6-4 to be all made of between turbulent baffle 6-4
High strength steel structure improves the shearing to gas and perturbation action, so that gas and flow reach sufficient Turbulence Mixed
Conjunction state.Small advantage that turbulence intensity that gas-water turbulent flow device is based on mixed flow is high, mixed flow turbulence intensity decays for
After the operation of high sand-carrying water drip irrigation system traditional simple dependence is substantially better than in terms of the cleaning of hollow billet silt sediment in existing system
Flow flushing effect.
The one end for rinsing sludge pipe 3-3 is connected with muddy water collecting pit 12, rinses on the other end of sludge pipe 3-3 and is provided with
Air bleeding valve 19.The region of the ends drip irrigation pipe 3-1 is avoided to eventually form the flood irrigation region of approximate traditional flood irrigation mode.
The tail end of a plurality of anti-clogging drip irrigation hollow billet 3-1 is by rinsing mud valve 3-4 and bridge piece 3-5 and rinsing spoil disposal
Pipe 3-3 connections.
Vacuum tank 13 is additionally provided between air compressor 5 and gas pipeline 4.Flushing is used in the effect of vacuum tank 13
Gas is sent into drip irrigation pipe network with the pressure that sets, so that system pressure is maintained and meets flushing pressure and maintain constant pressure model
In enclosing, avoids generating larger pressure oscillation, influence flushing effect.
Water pump 1 and air compressor 5 are connected with control terminal 14, for realizing automation control.
The course of work of the device of the invention is as described below：
Drip irrigation system is extracted required irrigation water, and pass through successively by aqueduct 2 by water 1 first in normal work
After crossing the 4th valve 10, y-type filter 17, pressure gauge 18 and the 5th valve 11, entered in drip irrigation zone 2 by water distributor 3-2
In drip irrigation pipe 3-1, dropper water distribution is realized by the water dropper on drip irrigation pipe 3-1, completes entire trickle irrigation process, at this time air pressure
Contracting machine 5 and its connected air recoil washing machine structure do not work.
Enter the air-water flushing stage after the water-pouring process in drip irrigation system completion said one trickle irrigation period, passes through control first
Terminal 14 controls water pump 1 and air compressor 5 is opened, the first valve 7, the second valve 8 and third valve 9 in open system,
And the flushing mud valve 3-4 of each drip irrigation pipe 3-1 tail end, simultaneously close off the 4th valve 10 and the 5th on aqueduct 2
Valve 11.
Since sand grain is being rinsed when the moisture content of silt sediment and silt sediment content difference in drip irrigation pipe 3-1
Required startup speed is different in the process, therefore to realize that effective flushing to hollow billet silt sediment under different condition should liquidate
Flushing gas pressure P, flushing head H are set separately during washing.Air-water, which is set, by the above method combines flushing drip irrigation system
Flushing gas pressure and the first-class parameter of flushing water flowing water after, control terminal 14 adjusts water according to above-mentioned parameter, by frequency converter
The mode of the rotating speed of pump 1 controls the pressure head of water pump water outlet, while the air supply system that air compressor 5 and vacuum tank 13 form
The gas of rated operating pressure can be provided for system flush.
The above-mentioned high pressure gas conveyed by gas pipeline 4 through vacuum tank 13 and warp export defeated through aqueduct 2 from water pump 1
The flow sent crosses behind the first valve 7, and the first valve 7 has the function of that preventing flow from flowing backwards enters air supply system.Hereafter,
Above-mentioned air and flow reach gas-water turbulent flow mixer by the bypass pipe of the branch pipe side of aqueduct 2 after the second valve
6, high pressure gas and flushing water source are sufficiently mixed in gas-water turbulent flow mixer 6, and flow and gas pass through in cylinder 6-1 jointly
Turbulent baffle 6-4, irregular disturbance occurs for flow and high pressure gas under the action of turbulent baffle 6-4, increases itself
Turbulent characteristics.Meanwhile above-mentioned high pressure gas is occurring to produce more small bubbles during turbulent fluctuation, micro-bubble with
It is more fully combined by the flow that turbulent baffle disturbs, further enhances the Turbulent characteristics of mixing wastewater with air stream, it can
With the impact and cleaning of the sand grain preferably to being deposited on the bottoms dropper hollow billet 3-1.
It is above-mentioned through the well-mixed air-water two phase flow of gas-water turbulent flow mixer after third valve 9 by water distributor 3-2 into
Entering in drip irrigation pipe 3-1, air-water two phase flow moves in pipe in turbulent condition after entering drip irrigation pipe 3-1, as shown in figure 4,
The two phase flow moved in drip irrigation pipe 3-1, will to being deposited on the irregular souring of the sand grain of drip irrigation pipe bottom
Silt sediment convolution, raise and with air-water two phase flow in drip irrigation pipe it is defeated shifting ultimately form air-water-sand three-phase mixed flow, on
After stating the flushing mud valve 3-4 that three-phase flows through drip irrigation pipe 3-1 tail ends, convergence, which enters, rinses in sludge pipe 3-3.Drip irrigation system end
The flushing sludge pipe 3-3 at end collects air-water-sand three-phase mixed flow through drip irrigation pipe 3-1 discharges, rinses mud in sludge pipe 3-3
Husky and flow flows to the muddy water of drip irrigation system end in spoil disposal bottom of the tube with the state of non-flowing full along the gradient for rinsing sludge pipe 3-3
In collecting pit 12.At the same time, into rinse the gas of sludge pipe 3-3 in pipe inner top and flow direction in opposite direction
Movement, by being discharged into air positioned at the air bleeding valve 3-6 for rinsing sludge pipe 3-3 head ends.And enter system end muddy water collecting pit
Arsenicbearing gold ores in 12 can then complete the clarification of the concentration and flushing water of silt, in case Collection utilization, and in muddy water collecting pit 12
Concentration silt then can be with periodic cleaning.
Embodiment 2：
The present embodiment provides a kind of hollow billet air water combination purging method for the direct trickle irrigation of high sand-carrying water, and this method uses
It is used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in Example 1, wherein：It combines and rinses in air water
The pressure in gas pipeline (4) is more than the pressure in aqueduct (2) in the process.
Gas pressure P, flushing water in the washing time T of control system, flushing process are needed in the implementation process of above-mentioned flushing
Head tri- design parameters of H, then directly drip for high muddy water under the conditions of the flushing pressure of setting after the washing time of operating provisions
Air water under the conditions of filling combines a complete flushing process for rinsing drip irrigation system to complete.
Claims (8)
1. a kind of hollow billet air water combination rinse-system for the direct trickle irrigation of high sand-carrying water, including water pump (1), water pump (1) pass through
Aqueduct (2) is connected with the water distributor (3-2) of drip irrigation zone (3), and the drip irrigation zone (3) include a plurality of drip irrigation pipe (3-1),
The head end of a plurality of drip irrigation pipe (3-1) is connected by water distributor (3-2), it is characterised in that：A plurality of drip irrigation pipe (3-1)
Tail end by rinse sludge pipe (3-3) be connected；
On aqueduct (2) between water pump (1) and water distributor (3-2) by carry the gas pipelines (4) of the first valve (7) with
Air compressor (5) is connected；
It is communicated with gas-water turbulent flow mixer (6), gas side by side on aqueduct (2) between gas pipeline (4) and water distributor (3-2)
Water turbulence mixer (6) both ends are equipped with the second valve (8) and third valve (9)；It is connected to side by side with gas-water turbulent flow mixer (6)
Aqueduct (2) on the 4th valve (10) and the 5th valve (11) are installed.
2. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in claim 1, it is characterised in that：
The gas-water turbulent flow mixer (6) includes cylinder (6-1), and cylinder one end (6-1) is connected with the end (6-2) that becomes a mandarin, cylinder (6-
1) other end is connected with going out to flow end (6-3), and multiple turbulent baffles (6-4) are provided in cylinder (6-1).
3. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as claimed in claim 2, it is characterised in that：
The turbulent baffle (6-4) be Semicircular baffle, it is multiple turbulent flow baffles (6-4) along cylinder (6-1) axial direction stagger arrangement successively
Formula is uniformly arranged.
4. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in claim 1, it is characterised in that：
The one end for rinsing sludge pipe (3-3) is connected with muddy water collecting pit (12), rinses the row of being provided on the other end of sludge pipe (3-3)
Air valve (19).
5. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in claim 1, it is characterised in that：
The tail end of a plurality of drip irrigation pipe (3-1) is by rinsing mud valve (3-4) and bridge piece (3-5) and rinsing sludge pipe
(3-3) is connected to.
6. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in claim 1, it is characterised in that：
It is additionally provided with vacuum tank (13) between the air compressor (5) and gas pipeline (4).
7. being used for the hollow billet air water combination rinse-system of the direct trickle irrigation of high sand-carrying water as described in claim 1, it is characterised in that：
The water pump (1) and air compressor (5) is connected with control terminal (14).
8. a kind of hollow billet air water combination purging method for the direct trickle irrigation of high sand-carrying water, it is characterised in that：This method is using such as
The hollow billet air water combination rinse-system for the direct trickle irrigation of high sand-carrying water described in claim 1 to 7 any claim, in gas
Pressure in water combination flushing process in gas pipeline (4) is more than the pressure in aqueduct (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405525.2A CN106076986B (en) | 2016-06-07 | 2016-06-07 | Hollow billet air water combination rinse-system and method for the direct trickle irrigation of high sand-carrying water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405525.2A CN106076986B (en) | 2016-06-07 | 2016-06-07 | Hollow billet air water combination rinse-system and method for the direct trickle irrigation of high sand-carrying water |
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| Publication Number | Publication Date |
|---|---|
| CN106076986A CN106076986A (en) | 2016-11-09 |
| CN106076986B true CN106076986B (en) | 2018-09-04 |
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| CN201610405525.2A Expired - Fee Related CN106076986B (en) | 2016-06-07 | 2016-06-07 | Hollow billet air water combination rinse-system and method for the direct trickle irrigation of high sand-carrying water |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106973758B (en) * | 2017-04-06 | 2020-05-26 | 中国农业大学 | Can realize industrial automation management's drip irrigation pipe network structure |
| CN107278820A (en) * | 2017-07-28 | 2017-10-24 | 内蒙古自治区水利科学研究院 | A kind of drip irrigation is poured water detecting system and suitable for crop field drip irrigation water adding system |
| CN107355628B (en) * | 2017-09-01 | 2023-01-03 | 苏州出入境检验检疫局检验检疫综合技术中心 | Pretreatment device for detection of water conveying and distributing pipe in wading product |
| CN108889732A (en) * | 2018-08-17 | 2018-11-27 | 浙江久立特材科技股份有限公司 | A kind of stainless steel light tube inner wall of long pipe Rustproofing apparatus and method |
| CN111282926B (en) * | 2020-02-27 | 2020-11-24 | 宁夏大学 | Pulse type infiltrating irrigation pipeline anti-blocking flushing device and method |
| CN114018568B (en) * | 2021-11-30 | 2022-07-08 | 中国水利水电科学研究院 | Flush valve test platform |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2413798Y (en) * | 2000-04-18 | 2001-01-10 | 杨凌秦川节水灌溉设备工程有限公司 | Water dropping device having inner inlaid drip irrigation tube |
| KR100550830B1 (en) * | 2004-04-27 | 2006-02-10 | 한국난방관리(주) | flow mix unit for heating pipe cleaning |
| US20060144965A1 (en) * | 2005-01-05 | 2006-07-06 | Ron Keren | Irrigation flushing system |
| CN202232395U (en) * | 2011-09-08 | 2012-05-30 | 甘肃大禹节水集团股份有限公司 | Static and mixed oxygenation trickle irrigation device |
| CN204232027U (en) * | 2014-08-21 | 2015-04-01 | 广西壮族自治区水利科学研究院 | A kind of buried drip irrigation pressure regulation anti-blocking system |
| CN105359934B (en) * | 2015-11-10 | 2018-04-17 | 西安建筑科技大学 | One kind reflux anti-clogging drip irrigation system and anti-clogging drip irrigation hollow billet |
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2016
- 2016-06-07 CN CN201610405525.2A patent/CN106076986B/en not_active Expired - Fee Related
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