CN107318593A - Combined press force compensating douche between a kind of washable pipe - Google Patents
Combined press force compensating douche between a kind of washable pipe Download PDFInfo
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- CN107318593A CN107318593A CN201710722588.5A CN201710722588A CN107318593A CN 107318593 A CN107318593 A CN 107318593A CN 201710722588 A CN201710722588 A CN 201710722588A CN 107318593 A CN107318593 A CN 107318593A
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- 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
Abstract
The present invention relates to Combined press force compensating douche between a kind of washable pipe, including emitter body, pressure-compensated film, water outlet ring cavity and movable screwed pipe；Fixed screwed pipe is set in one end of emitter body, movable screwed pipe is connected through a screw thread in the other end of emitter body；The first labyrinth flow-path is disposed with the outer wall of the emitter body between fixed screwed pipe and movable screwed pipe, the whole story of the first labyrinth flow-path is the water inlet communicated with the inside of emitter body；Water outlet ring cavity is arranged in the outside for the emitter body fixed between screwed pipe and movable screwed pipe；Pressure-compensated film ring is located between water outlet ring cavity and emitter body and two ends are limited in fixed screwed pipe and movable screwed pipe；Second labyrinth flow-path is set on the inwall of water outlet ring cavity, and the end of the second labyrinth flow-path is the delivery port communicated with the outside of water outlet ring cavity；The film flowing hole of the first labyrinth flow-path of connection and the second labyrinth flow-path is provided with pressure-compensated film.
Description
Technical field
The present invention relates to Combined press force compensating douche between a kind of washable pipe, belong to agricultural irrigation technology.
Background technology
China faces the shortage of water resources problem of sternness, and agricultural irrigation is as water rich and influential family is used, and imbalance between supply and demand is outstanding day by day, and
Agricultural irrigation water effective rate of utilization is low, and water-saving irrigation is arisen at the historic moment.Drip irrigation is current water saving efficiency highest slight irrigation mode, water
Utilization rate may be up to more than 95%, be an important technique measure for ensureing China's agricultural sustainable development.Douche is whole
The core and key component of drip irrigation system, the good and bad anti-blockage capability and aging effects to uniformity of pouring water, system of its structure
It is very big.The douche used in drip irrigation system has a many kinds, and pressure compensation douche is one of type for being widely used.Pressure
Compensation douche is that a kind of adjustment effect that can compensate pad by internal pressure in the range of certain pressure realizes constant current water outlet
Drip irrigation end equipment, have the advantages that compensation performance is good, pour water uniform, laying length length, wide adaptation range, be particularly suitable for use in
Hypsography is larger, system pressure is unbalanced and the longer situation of hollow billet.Generally for preferable hydraulic performance is ensured, pressure is mended
The general very little of inner flow passage size of douche is repaid, existing labyrinth flow-path and pressure-compensated structure is combined in the market
Pressure-compensated douche, channel size is more between 0.7~1.5mm, is also easy to produce blockings, and flow is less than normal, unsuitable
Irrigated in mountain region economic forest.Moreover, the pressure-compensated douche currently existed, although with certain pressure compensation
Can and the good uniformity, but its compensation is interval smaller, apply compensate interval in mountain region gravity irrigation can not be with the mountain region discrepancy in elevation
It is adapted with complicated landform, it is impossible to play the high advantage of its uniformity of irrigation water appilcation, it is poor to result in the douche uniformity, irrigates effect
Really bad defect.Therefore, solving the problems such as douche is easily blocked, flow is small and compensates poor performance has particularly important meaning
Justice.
The common blocking mode of douche mainly has physical clogging, electroless Ni-P-C-O plating, toxicity bioassay etc., typically with physical clogging most
To be common.The effective ways of physical clogging for solving to be caused by sand grain are to increase its import and channel size, but increase into
Mouth and channel size will sacrifice the part hydraulic performance of runner.The Chinese patent application of Application No. 201610532350.1 is disclosed
A kind of compensation drip emitter, is optimized design to douche inside cavity structure, improves irrigation efficiency and water
The utilization rate of resource, but the adjustable range of its flow is smaller, it is impossible to the requirement of big flow irrigation is met, its structural shape is on pipe
Outlet type, during more complicated applied to landform mountain region, assembling is wasted time and energy.
The content of the invention
In view of the above-mentioned problems, it is an object of the invention to provide Combined press force compensating douche between a kind of washable pipe, should
Douche can solve the problems, such as the anti-clogging of douche in the case where not changing channel size, from without influenceing the waterpower of douche
Performance.
To achieve the above object, the present invention uses following technical scheme：Combined press force compensating is filled between a kind of washable pipe
Hydrophone, it is characterised in that：Including emitter body, pressure-compensated film, water outlet ring cavity and movable screwed pipe；In the douche
One end of main body sets fixed screwed pipe, and the movable screwed pipe is connected through a screw thread in the other end of the emitter body；In place
It is disposed with the first labyrinth flow-path on the outer wall of the emitter body between the fixed screwed pipe and movable screwed pipe, described the
The whole story of one labyrinth flow-path is the water inlet communicated with the inside of the emitter body；The water outlet ring cavity is arranged in institute
State the outside of the emitter body between fixed screwed pipe and movable screwed pipe；The pressure-compensated film ring goes out described in being located at
Between water ring chamber and the emitter body and two ends are limited in fixed screwed pipe and movable screwed pipe；In the inwall of the water outlet ring cavity
The second labyrinth flow-path of upper setting, the end of second labyrinth flow-path is the delivery port communicated with the outside of the water outlet ring cavity；
The film flowing hole of the first labyrinth flow-path of connection and the second labyrinth flow-path is provided with the pressure-compensated film.
The emitter body is hollow cylindrical structure, and first labyrinth flow-path is arranged on the hollow cylindrical structure
On outer wall；First labyrinth flow-path and the second labyrinth flow-path are tooth-shape labyrinth runner.
The fixed screwed pipe and movable screwed pipe are connected through a screw thread hollow billet respectively.
Regulation ring cavity is provided with the end of second labyrinth flow-path, the center of the regulation ring cavity is provided with circle
Ring convex platform, the delivery port is located at the hollow part of the circle convex platform；Groove is provided with the side wall of the circle convex platform.
The water outlet ring cavity is the hollow cylindrical structure that two ends bore is big, middle part bore is small, wherein, heavy caliber part is used for
The water outlet ring cavity is positioned between the fixed screwed pipe and movable screwed pipe, the internal diameter of osculum path portion and the pressure compensation
The external diameter of formula film is equal.Area and the first labyrinth flow-path, the section flow surface of the second labyrinth flow-path of the film flowing hole
Product is identical.
Multiple grooves for being used to save material are offered on the emitter body.
Filtering grid is provided with the water inlet.
The height of the circle convex platform is less than the height of the regulation ring cavity.
The parameter of the tooth-shape labyrinth runner meets following geometrical relationships：
F=0.7776w+0.0307, n=-181.64w2+ 390.9w-70.51, a=-0.7857w2+1.6753w+
0.3852
In formula, w is width of flow path；F is local loosening；A is the facewidth；N is flow passage unit number.
The present invention is due to taking above technical scheme, and it has advantages below：1 present invention realizes emitter body and pressure
The separation of compensation type film, water outlet ring cavity,, can be with therefore when runner is blocked with dismounting, advantage easy to clean
Rotary moveable screwed pipe, emitter body is taken out from water outlet ring cavity, pressure-compensated film and emitter body is respectively washed, and is grasped
Make simple, douche blockage problem is well solved, the raising of performance of anti-blockage can extend making for douche
With the time limit, the use cost of drip irrigation is substantially reduced.2nd, the present invention is on pipe on the basis of outlet type pressure compensation douche structure,
Formula pressure compensation douche between the pipe that labyrinth flow-path and pressure-compensated structure are combined is proposed, wherein, emitter body inner chamber
The structural advantage of column type douche can be made full use of, while utilizing screw thread knot as hollow billet excessively stream, outer wall arrangement labyrinth flow-path
Structure realizes the separation of hollow billet and douche, changes the design concept of douche and hollow billet integral type.3rd, the present invention is in conventional pressure
On the basis of the gland of force compensating douche, it is proposed that the water outlet ring cavity of hollow cylindrical structure, play a part of fixed film, together
Shi Qi inwalls arrange labyrinth flow-path and regulation ring cavity, add the deformable area after pressure-compensated film stress, greatly
It is big to increase pressure compensation interval.4th, in use, pressure-compensated film can be sent out according to the change for carrying out water pressure
Raw different degrees of deformation, uses the second labyrinth flow-path on water ring chamber and regulation ring cavity is crossed water depth and sent out with the change of pressure
Raw to change, fluid motion is voluntarily adjusted with pressure-compensated deformation of thin membrane interaction convection current road delivery port uninterrupted,
Realize water outlet constant discharging.The 5th, douche is first arranged on to the side of hollow billet, then in field during present invention assembling douche
Between when being installed, hollow billet is placed on corresponding position, staff only will need to not install the hollow billet side of douche with being connected
The screwed pipe of the douche of hollow billet carries out screwing up connection, so as to greatly reduce installation workload.6th, each part of the invention
All it is independent part, it is a certain when destructing serious partially, it is only necessary to change and damage part, change conventional cylindrical labyrinth type douche
The production theory of disposable products, realizes seriation, the standardization of such New-style Emitter.7th, water outlet ring cavity of the present invention, pour water
Device main body can put into batch production, and flow different in agricultural production is met by changing the structure of labyrinth flow-path from size
Demand.8th, delivery port lower end of the present invention is that the height of boss, which is less than, to be adjusted provided with regulation ring cavity on the outside of a circle convex platform, circle convex platform
The height of ring cavity is saved, prevents that film deflection at regulation ring cavity is excessive, circle convex platform is provided with groove, prevents film from blocking out
The mouth of a river hinders stream.9th, the present invention can meet the irrigation requirement in the range of certain flow, and uniformity of irrigation water appilcation is high, it is adaptable to various mountains
The obvious regional agricultural production drip irrigation of variation in water pressure and low discharge irrigate situation in the aqueducts such as ground, hills, the scope of application compared with
Extensively.
Brief description of the drawings
Fig. 1 is the overall structure diagram of the present invention；
Fig. 2 is the structural representation of emitter body of the present invention；
Fig. 3 is the structural representation of movable screwed pipe of the invention；
Fig. 4 is the scheme of installation of pressure-compensated film of the present invention and emitter body；
Fig. 5 is the cross section structure diagram of water outlet ring cavity of the present invention；
Fig. 6 be in Fig. 5 A-A to half-section diagram；
Fig. 7 is the half-section diagram of B-B direction in Fig. 5；Wherein, what 1. corresponding line represented is first stage pressure-compensated
The also undeformed schematic diagram of film, 2. what corresponding line was represented is the schematic diagram after second stage deformation of thin membrane, now, runner mistake
Water area reduces, and douche plays pressure compensation effect；
Fig. 8 is the structural representation of hollow billet of the present invention；
Fig. 9 is the geometrical model schematic diagram of (first/second) labyrinth flow-path of the invention；
Figure 10 is the curve relation figure that width of flow path w changes with average water head loss coefficient f；
Figure 11 is flow passage unit number n and width of flow path w curve relation figure；
Figure 12 is facewidth a and width of flow path w curve relation figure.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
As shown in figures 1-4, the present invention includes emitter body 1, pressure-compensated film 2, water outlet ring cavity 3 and movable screw
Pipe 4.Fixed screwed pipe 5 is set in one end of emitter body 1, movable screw is connected through a screw thread in the other end of emitter body 1
Pipe 4.The first labyrinth flow-path 6 is disposed with the outer wall of the emitter body 1 between fixed screwed pipe 5 and movable screwed pipe 4, the
The whole story of one labyrinth flow-path 6 is the water inlet 7 communicated with the inside of emitter body 1.Water outlet ring cavity 3 is arranged in fixing spiral shell
The outside of emitter body 1 between pipe 5 and movable screwed pipe 4.The ring of pressure-compensated film 2 is located at water outlet ring cavity 3 and douche
Between main body 1 and two ends are limited in fixed screwed pipe 5 and movable screwed pipe 4.Second labyrinth flow-path is set on the inwall of water outlet ring cavity 3
8, the end of the second labyrinth flow-path 8 is the delivery port 9 communicated with the outside of water outlet ring cavity 3.Set on pressure-compensated film 2
There is the film flowing hole 10 of the first labyrinth flow-path 6 of connection and the second labyrinth flow-path 8.
Further, emitter body 1 is hollow cylindrical structure, and the first labyrinth flow-path 6 is arranged on hollow cylindrical structure
On outer wall.First labyrinth flow-path 6 and the second labyrinth flow-path 8 are tooth-shape labyrinth runner.
Further, as shown in Fig. 5~7, regulation ring cavity 12 is provided with the end of the second labyrinth flow-path 8, ring cavity is adjusted
12 center is provided with circle convex platform 13, and delivery port 9 is located at the hollow part of circle convex platform 13.The height of circle convex platform 13
Less than the height of regulation ring cavity 12, prevent that the deformation at regulation ring cavity 12 position of pressure-compensated film 2 is excessive.In circle convex platform
Groove 14 is provided with 13 side wall, prevents pressure-compensated film 2 from blocking delivery port 9 after deforming and hindering stream.
Further, fixed screwed pipe 5 and movable screwed pipe 4 are connected by screw thread with hollow billet 11 (as shown in Figure 8) respectively.
Further, water outlet ring cavity 3 is the hollow cylindrical structure that two ends bore is big, middle part bore is small, wherein, heavy caliber portion
Dividing is used to water outlet ring cavity 3 being positioned between fixed screwed pipe 5 and movable screwed pipe 4, the internal diameter and pressure-compensated of osculum path portion
The external diameter of film 2 is equal, so that the second labyrinth flow-path 8 is sealed by pressure-compensated film 2.
Further, the area of film flowing hole 10 and the first labyrinth flow-path 6, the section flow surface of the second labyrinth flow-path 8
Product is identical, so as to avoid because area of passage change produces influence to current hydraulic performance.
Further, multiple grooves 15 for being used to save material are offered on emitter body 1.
Further, filtering grid is provided with water inlet 7, blocking can be reduced with the impurity in filtering irrigation water.
The present invention operation principle be：Current enter the first labyrinth flow-path 6 of emitter body 1 from water inlet 7, through pressure
The film flowing hole 10 of compensation type film 2 enters the second labyrinth flow-path 8 of water outlet ring cavity 3, then through the centre position of water outlet ring cavity 3
The collection waters for adjusting ring cavity 12 reaches the delivery port 9 on top.With being continually changing for intake pressure, under pressure-compensated film 2
Portion is deformed upon by the impact of hydraulic pressure, is caused second labyrinth flow-path 8 on the top of pressure-compensated film 2 and is adjusted ring cavity 12
The cross-section of river occurs the internal pressure of the second labyrinth flow-path 8 on corresponding change, water outlet ring cavity 3 and sent out with regulation ring cavity 12 internal pressure
The raw extruding for changing renitency compensation type film 2 in turn, by the common regulation douche flow of this interaction, is used
Water is evenly.Under normal pressure, the face for crossing water section of the second labyrinth flow-path 8 and regulation ring cavity 12 on the inwall of water outlet ring cavity 3
Product is maximum, and the outlet of douche normally goes out stream, and as the pressure increases, pressure-compensated film 2 raises up, now pressure compensation
Second labyrinth flow-path of the extruding of formula film 28 and regulation ring cavity 12, block a part of runner exit section, the second labyrinth flow-path 8 and tune
The section water-outlet area of ring cavity 12 is changed, and the fluid in runner is influenceed in turn.Now second on intake pressure and water outlet ring cavity 3
The internal pressure of labyrinth flow-path 8, the regulation internal pressure of ring cavity 12 are mutually extruded film, and collective effect reduces the second labyrinth flow-path 8
With regulation ring cavity 12 discharge area, flow reduces therewith, this to be substantially increased by the compensation way for changing discharge section area
Pressure compensation is interval, improves the water outlet uniformity of mountain region drip irrigation, while also improving degree of regulation and reliability.
The present invention realizes emitter body 1 and pressure-compensated film 2, the separation of water outlet ring cavity 3, dismounting, cleaning side
Just, therefore when runner is blocked, emitter body 1 can be taken out from water outlet ring cavity 3 with rotary moveable screwed pipe 4, it is clear respectively
Pressure-compensated film 2 and emitter body 1 are washed, it is simple to operate, douche blockage problem is well solved, resist
The raising of plugging performance can extend the service life of douche, substantially reduce the use cost of drip irrigation.
The present invention is also done to study to the structure of tooth-shape labyrinth runner, and the parameter to tooth-shape labyrinth flow passage structure is done to limit
It is fixed, to reach by increasing width of flow path, frequency is blocked to reduce runner, flow passage unit number is reduced, reduction construction costs
Purpose.As shown in figure 9, can show that width of flow path and the facewidth, tooth height, geometry of the bottom of the tooth away between are closed by plane geometry model
System：
Wherein the facewidth and tooth are high meets following relation between tooth angle：
Runner discharge area A can be expressed as before not deforming：
A=d × w (3)
Runner water flow Q can be expressed as：
In formula：W is width of flow path, mm；H is that tooth is high, mm；A is the facewidth, mm；B is bottom of the tooth away from mm；θ is tooth angle, °；d
For flow channel depth, mm；A is cross section of fluid channel area, m2；Q is runner water flow, L/h；For the average speed of fluid, m ﹒ s-1。
From performance of anti-blockage and it is produced into original, larger runner discharge area and shorter flow channel length help to carry
The performance of anti-blockage and reduction cost of high douche, while the big flow demand of pressure compensation douche can be met, still
Increase width of flow path, reduction flow passage unit number can reduce the effect of energy dissipation of runner, therefore, and the present invention proposes wide in increase runner
While degree, reduction flow passage unit number, increase average water head loss coefficient so that increase runner discharge area, reduction runner
Unit number can't weaken the effect of energy dissipation of runner.
The frictional head loss passed through in view of current in runner be can be ignored, and the present invention is only examined in calculating process
Consider local head loss, it is long by runner for identical flow channel shape because local loosening is only relevant with flow channel shape
For the local head loss for spending distribution, its pressure loss is evenly distributed in length, meets linear superposition rule, therefore
Can be discrete by the whole loss of flood peak and be evenly distributed in whole runner, and come near by Darcy-Weisbach formula (7)
Like the loss of flood peak for expressing runner.Further, since the 90% of the loss of flood peak occurs at crown structure, therefore, the present invention is in meter
Assume that local loosening is only relevant with runner corner α during calculation, according to existing local head loss's empirical coefficient
Table (is shown in Table 1), it is found that local loosening f and runner corner α meets relational expression：
F=0.7 × 10-4×α2.1441 (5)
Will be by the runner corner α of two equal angulars, therefore by tooth form labyrinth flow-path unit in view of current
α=90 °-θ/2 are substituted into formula (5), local loosening f and angle between teeth θ is obtained and meets relational expression：
F=1.4 × 10-4×(90°-θ/2)2.1441 (6)
In formula：H is the loss of flood peak, m；F is local loosening, relevant with runner corner, looks into local head loss
Empirical coefficient table (table 1) is known；α is runner corner, °；N is flow passage unit number；liFor single flow passage unit flow channel length, mm；D
For hydraulic diameter, mm；G is acceleration of gravity, takes 9.81m/s2。
Formula (1), (3) and formula (6)~(9) are substituted into formula (4), obtained：
It can see from formula (10), the relation between flow Q and width of flow path w, flow passage unit number n is extremely complex,
Therefore the present invention proposes on the premise of ensureing that runner water flow Q is constant, to utilize the geometrical relationship between runner geometric parameter
The relation between flow passage unit number n and width of flow path w is roughly analyzed with hydraulic formula.
In the case where not considering deformation of thin membrane, it is assumed that water inlet working head is 10m, Serial regulation geometric parameter causes
Average water head loss coefficient f increases and approximately linear increase with width of flow path w, now flow passage unit number n and width of flow path w
Relation meet the parabolic relation curve that Open Side Down, while facewidth a change also shows this rule, obtain result such as
Shown in Figure 10~12.Pass through fitting, obtained formula respectively f=0.7776w+0.0307, n=-181.64w2+390.9w-
70.51, a=-0.7857w2+ 1.6753w+0.3852, the coefficient of these relational expressions can change with the change of concrete condition,
But the changing rule of these parameters will not become.Result of calculation is shown in Table 2,3, by taking circumferential edge as an example, when width of flow path w is more than
During 1.10mm, average water head loss coefficient f continues to increase, and flow passage unit number n starts to reduce, in actual production operation, according to
According to the changing rule between the parameters obtained herein, specific design is carried out, wide runner, the pressure of few flow passage unit is obtained and mends
Repay douche.
The local head loss's empirical coefficient table of table 1
The runner discharge area computational chart of table 2
The runner mean flow rate of table 3, water flow computational chart
The present invention is only illustrated with above-described embodiment, and structure, set location and its connection of each part are all to have
Changed, on the basis of technical solution of the present invention, all improvement carried out according to the principle of the invention to individual part and equivalent
Conversion, should not be excluded outside protection scope of the present invention.
Claims (10)
1. Combined press force compensating douche between a kind of washable pipe, it is characterised in that：Including emitter body, pressure-compensated
Film, water outlet ring cavity and movable screwed pipe；Fixed screwed pipe is set in one end of the emitter body, in the emitter body
The other end is connected through a screw thread the movable screwed pipe；In the douche master between the fixed screwed pipe and movable screwed pipe
The first labyrinth flow-path is disposed with the outer wall of body, the whole story of first labyrinth flow-path is the inside phase with the emitter body
Logical water inlet；The water outlet ring cavity is arranged in the emitter body between the fixed screwed pipe and movable screwed pipe
It is outside；The pressure-compensated film ring is located between the water outlet ring cavity and the emitter body and two ends are limited in fixation
Screwed pipe and movable screwed pipe；Second labyrinth flow-path, the end of second labyrinth flow-path are set on the inwall of the water outlet ring cavity
The delivery port communicated for the outside with the water outlet ring cavity；The first labyrinth flow of connection is provided with the pressure-compensated film
The film flowing hole in road and the second labyrinth flow-path.
2. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：It is described to pour water
Device main body is hollow cylindrical structure, and first labyrinth flow-path is arranged on the outer wall of the hollow cylindrical structure；Described first
Labyrinth flow-path and the second labyrinth flow-path are tooth-shape labyrinth runner.
3. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：The fixation
Screwed pipe and movable screwed pipe are connected through a screw thread hollow billet respectively.
4. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：Described
The end of two labyrinth flow-paths is provided with regulation ring cavity, and the center of the regulation ring cavity is provided with circle convex platform, the water outlet
Mouth is located at the hollow part of the circle convex platform；Groove is provided with the side wall of the circle convex platform.
5. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：The water outlet
Ring cavity is the hollow cylindrical structure that two ends bore is big, middle part bore is small, wherein, heavy caliber part is used to determine the water outlet ring cavity
Position is between the fixed screwed pipe and movable screwed pipe, the external diameter phase of the internal diameter of osculum path portion and the pressure-compensated film
Deng.
6. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：The film
The area of flowing hole is identical with the section discharge area of the first labyrinth flow-path, the second labyrinth flow-path.
7. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：Filled described
Multiple grooves for being used to save material are offered on water machine body.
8. Combined press force compensating douche between a kind of washable pipe as claimed in claim 1, it is characterised in that：It is described enter
Filtering grid is provided with the mouth of a river.
9. Combined press force compensating douche between a kind of washable pipe as claimed in claim 4, it is characterised in that：The annulus
The height of boss is less than the height of the regulation ring cavity.
10. Combined press force compensating douche between a kind of washable pipe as claimed in claim 2, it is characterised in that：The tooth
The parameter of type labyrinth flow-path meets following geometrical relationships：
F=0.7776w+0.0307, n=-181.64w2+ 390.9w-70.51, a=-0.7857w2+1.6753w+0.3852
In formula, w is width of flow path；F is local loosening；A is the facewidth；N is flow passage unit number.
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| CN108935016A (en) * | 2018-09-11 | 2018-12-07 | 中国农业大学 | A kind of flow regulator for drip irrigation |
| CN111527856A (en) * | 2020-05-28 | 2020-08-14 | 安徽省益丰生态农业科技有限公司 | Drip irrigation device for integrating water and fertilizer |
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| CN204291926U (en) * | 2014-11-25 | 2015-04-29 | 新疆西部节水科技股份有限公司 | Interior edge paster pressure compensated drip device |
| CN106096179A (en) * | 2016-06-24 | 2016-11-09 | 中国农业大学 | Drip emitter flow passage structure design method and fractal runner drip emitter product thereof |
| CN106171843A (en) * | 2016-07-07 | 2016-12-07 | 中国农业大学 | A kind of blockage resisting pressure compensation douche of the uniform self-regulated of rate of discharge |
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| CN108935016A (en) * | 2018-09-11 | 2018-12-07 | 中国农业大学 | A kind of flow regulator for drip irrigation |
| CN111527856A (en) * | 2020-05-28 | 2020-08-14 | 安徽省益丰生态农业科技有限公司 | Drip irrigation device for integrating water and fertilizer |
| CN111527856B (en) * | 2020-05-28 | 2021-06-25 | 安徽省益丰生态农业科技有限公司 | Drip irrigation device for integrating water and fertilizer |
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