CN103691604A - Design method of inner elbow structure of oscillating arm sprinkler - Google Patents
Design method of inner elbow structure of oscillating arm sprinkler Download PDFInfo
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- CN103691604A CN103691604A CN201310562322.0A CN201310562322A CN103691604A CN 103691604 A CN103691604 A CN 103691604A CN 201310562322 A CN201310562322 A CN 201310562322A CN 103691604 A CN103691604 A CN 103691604A
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- sprinkler
- shower nozzle
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- bend pipe
- oscillating arm
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
- B05B1/34—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to influence the nature of flow of the liquid or other fluent material, e.g. to produce swirl
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Abstract
The invention discloses a design method of an inner elbow structure of an oscillating arm sprinkler. The method changes the curve shape of an inner elbow structure of an original sprinkler, changes the structure of the arc elbow curve of the original sprinkler into the achimedean spiral structure and carries out enlarging or shortening on a transition section between an auxiliary spray nozzle and an inlet by 1mm; simulation and experiment methods prove that an elbow of the oscillating arm sprinkler, which is designed by the method, is scientifically and reasonably designed and is low in cost, hydraulic loss and energy loss of a flow field in the oscillating arm sprinkler can be effectively reduced and the flow and the range are increased, so that the irrigation control area of the sprinkler is increased, cost of a combined sprinkling irrigation system is reduced and the aim of saving water resources is fulfilled.
Description
Technical field
The invention belongs to component of machine and manufacture field, relate to a kind of design for rainers such as farmland, Garden Greenland and floral nurseries, particularly a kind of method for designing of inside bend pipe structure of impact driven sprinkler.
Background technology
Impact driven sprinkler was the shower nozzle that China is most widely used, and China started to introduce, promote sprinkler irrigation technique in 1945.On the basis of introducing, in 1981, succeed in developing PAC40 and PAC60 vertical rocker-arm formula shower nozzle.The major product of current domestic land for growing field crops sprinkling irrigation sprinkler head is within 1987, to introduce ZY series metal impact driven sprinkler and the improved form thereof that Austrian Ball Corp production line is produced, as DY series shower nozzle, ZPY combined long jet pipe metal rocker arm formula shower nozzle etc., it is main material that product be take zinc-containing alloy and copper.Tenth Five-Year Plan Period, China succeeds in developing inlet diameter 80mm and the large flow Far Range of 100mm2 kind impact driven sprinkler, and the novel hoodle swing block type commutator of first Application, solved the insecure technical barrier of the big-and-middle-sized rotating sprinkler commutator of China work for a long time, meanwhile, China also actively carries out the formulation work of shower nozzle test standard.As, promulgated by the ministries or commissions of the Central Government < < shower nozzle test method > > of agricultural machinery in 1979; Within 1985, promulgated again the national standard of 3 rotating sprinklers: < < rotating sprinkler pattern basic parameter > > (GB5670.1-85), < < rotating sprinkler technical conditions > > (GB5670.2-85) and < < rotating sprinkler test method > > (GB5670.3-85); Within 1997, according to international standard, revise again and promulgated standard < < rotating sprinkler > > (JB/T7867-1997).
The quality of the performance of shower nozzle own is by the impact quality of pouring water.The runner of shower nozzle will complete that pressure flow enters, turning, energy exchange and several work of injection.The version physical dimension of runner, section configuration and surface roughness etc., all affect the hydraulic performance of shower nozzle.For reducing the inner hydraulic loss of shower nozzle runner, improve sprinkler pattern range, in mesohigh shower nozzle, adopt auxiliary jet to drive and increase the method for main jet length of tube, and utilize integral casting forming technology to add dividing plate or flow steadying grid in shower nozzle inside; For single injector shower nozzle or unidirectional Double-nozzle sprayer, adopt the method that balancer is installed at sprinkler body rear side, solved the problem of the shower nozzle crank causing because main jet pipe is long; For small low-voltage shower nozzle, adopt nozzle outside that Sui Shui mechanism is installed, special-shaped nozzle is installed or nozzle place is tiltedly opened to the forms such as otch, improve the atomization characteristics of shower nozzle, increase the nearly shower nozzle place water yield.
In research at present, structural design mainly concentrates on air deflector parameter designing, the structural design of elevation angle of spray nozzle and as in the design of the new type nozzle of heterotypic spray nozzle etc., but in shower nozzle inner flow passage, with the bend pipe (Fig. 2) of junction, auxiliary jet position be the place that whole shower nozzle bears static pressure maximum, when pressure water stream passes through elbow, current continuity is destroyed, and produces eddy current and cross current, causes the loss of flood peak of shower nozzle inner flow passage excessive inhomogeneous with jet expansion flow velocity.The optimal design of shower nozzle bend pipe runner parameter, can improve Sprinkler Performances, improves shower nozzle job stability.Former shower nozzle bend pipe curve as shown in Figure 3, answer emphasis to consider, but relevant research seldom in design process.
Summary of the invention
The defect or the deficiency that for above-mentioned variable sprayer, exist, the object of the invention is to, a kind of method for designing of inside bend pipe structure of impact driven sprinkler is provided, the method is optimized processing by the parameter of curve of the inside bend pipe of former impact driven sprinkler, newly design a kind of bend pipe of Archimedes spiral curve form, to replace the similar circular arc type bend pipe in former shower nozzle, can effectively reduce hydraulic loss and the energy loss of impact driven sprinkler flow field, thereby reach the saving of water resource.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of method for designing of inside bend pipe of impact driven sprinkler, it is characterized in that, the method is designed to Archimedes spiral formula by the circle arc curve of the inner bend pipe of former impact driven sprinkler jet pipe, and the transition between auxiliary jet and entrance is expanded or dwindles processing;
The equation of described Archimedes spiral under polar coordinates is r=0.861 θ, wherein 0< θ <35.96.
According to the present invention, described transition expands or dwindles and is of a size of 1mm.
Adopt the method for designing of the inside bend pipe structure of impact driven sprinkler of the present invention, by the method for numerical simulation and hydraulic experiment, select optimum curve combination, in the time of can realizing shower nozzle work, current are by after hollow shaft, optimum bend pipe curve and transition line are transformed into comparatively smooth-going current disturbed current after sprinkler body is turned, with the more uniform form of cross-sectional flow, enter nozzle, thereby make shower nozzle can obtain more satisfactory hydraulic performance.After bend pipe parameter of curve is optimized, turbulent situation and spray loss in the time of can reducing current through pipe bent position, increased sprinkler pattern range, improved performance, thereby it is large to have solved former shower nozzle energy loss, the problems such as current are uneven in shower nozzle internal flow, and hydraulic loss is larger, thus reach the saving of water resource.
Accompanying drawing explanation
Fig. 1 is the structural representation that adopts the impact driven sprinkler based on Archimedes spiral bend pipe curve shape prepared by method of the present invention.
Fig. 2 is the three-dimensional structure diagram of bent tube section.
Fig. 3 is the structural representation of former shower nozzle bend pipe curve.
Fig. 4 is the structural representation of shower nozzle bend pipe curve, and wherein, a is front view, and b is cutaway view.
Fig. 5 is flow field strain rate figure.
Fig. 6 is flow field pressure and wall shear stress figure.
Fig. 7 is major-minor jet expansion speed and inlet velocity diagram.
Fig. 8 is the profile of flowrate of major-minor nozzle.
Fig. 9 is processed sample photo.
Figure 10 is the range figure of different bend pipe curve shower nozzles.
Mark in figure represents respectively: 1, bend pipe inside curve, 2, main burner, 3, curve outside bend pipe, 4, auxiliary jet, 5, transition.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The specific embodiment
Its technical thought of the present invention is the structural parameters that change the inner bend pipe curve of former shower nozzle, thereby realize, reduces hydraulic loss and energy loss in shower nozzle, the object that Sprinkler Performances is optimized.
Referring to Fig. 4, the present embodiment provides the method for designing of the inside bend pipe structure of impact driven sprinkler, the method is in design, to curve 3(outside the bend pipe inside curve 1 in the inside bend pipe of former impact driven sprinkler and bend pipe, be circle arc curve originally) be all designed to Archimedes spiral formula, wherein, the Archimedes spiral two ends of bend pipe inside curve 1 are smoothly tangent with entrance and main burner 2 respectively, outside bend pipe, the Archimedes spiral two ends of curve 3 are smoothly tangent with main burner 2 and auxiliary jet 4 respectively, to the transition 5(transition between auxiliary jet 4 and entrance, be straight line) expand or dwindle processing, the minimal segment that is about to inner flow passage bent tube section diameter expands or dwindles 1mm and process, to obtain more level and smooth transition, transition 5 two ends are tangent with the line segment of auxiliary jet 4 and entrance respectively.
The equation of described Archimedes spiral under polar coordinates is r=0.861 θ, wherein 0< θ <35.96.
Adopt the method for the present embodiment to make Archimedes spiral curve shower nozzle (the present invention) structure as shown in Figure 1.
The know-why of following spiral of Archimedes:
Spiral of Archimedes, also claims on " constant speed helix ".Can be applied in spiral water elevator, on the cam of helicoidal pump and automotive brake, it is exactly r(θ that its equation is write as polar form)=a+b(θ), in formula, b: spiral of Archimedes coefficient, mm/ °, represents that the increase (or reducing) in utmost point footpath when every rotation 1 is spent is measured; θ: polar angle, unit is degree, represents total number of degrees that spiral of Archimedes turns over; A: the utmost point footpath when θ=0 °, mm.
Its maximum feature can be converted into linear uniform motion uniform circular motion exactly.Feature in inner flow passage is outwards to be launched by limit, identical with the flow field patterns of rotation, adopt this form, entrance is led aspect revolving and is had one's own knack at liquid, flow conductivity is stronger, in pipe bent position, a part of pressure energy can be converted into kinetic energy, be conducive to form rapidly comparatively stable eddy flow, its two ends are tangent with entrance and exit respectively, smooth excessiveness, runner even wearing, impact little, good steady flow condition.
In the present embodiment, the equation of designed Archimedes spiral under polar coordinates is r=0.861 θ, wherein 0< θ <35.96.
1. analog result comparative analysis
Curve Design is had to two key structure parameters, be respectively the processing mode of curve shape and transition and jet pipe junction.In table 1, qu1, qu2, qu3 is respectively circular curve (former shower nozzle curve), parabolic curve, Archimedes spiral.Qu1d, qu2d, qu3d and qu1x, qu2x, qu3x are respectively transition line and auxiliary jet junction is done expansion processing and dwindles processing, bend pipe inner flow passage minimum dimension place is expanded or dwindles 1mm, so just has 9 kinds of different curves and transition combination.
Bathymetric data (mm) falls in the actual measurement of table 1 shower nozzle rain gage bucket
By former shower nozzle and newly-designed Archimedes spiral curve shower nozzle (the present invention) are carried out to numerical simulation in fluid dynamics software FLUENT, when inlet porting pressure is 300Kpa, analog result is as shown in Fig. 5 to Fig. 8.
Can find out, the shower nozzle of Archimedes spiral curve, at aspects such as flow field strain rate, wall static pressure power, wall shear stress, flow distribution and major-minor nozzle import and export speed, has good performance.Wherein the former capacity of sprinkler of flow-rate ratio increases by 3.7%, effectively raises the performance of shower nozzle.
2, experimental analysis
Newly-designed Archimedes spiral curve shower nozzle (the present invention) rapid shaping is processed to shower nozzle mock-up, i.e. the shower nozzle of 9 kinds of different curves and transition combination, as shown in Figure 9.
The pressure adopting in experiment has 200KPa, 250KPa, 300KPa, 350KPa, 400KPa, under different pressure to every kind of shower nozzle research experiment, the rain gage bucket diameter that testing equipment is selected is 19.5cm, adopt radiant type rain gage bucket distribution mode, along shower nozzle, spray direction, at interval of 1m, be evenly arranged rain gage bucket, can measure its range and water distribution thus, as shown in Figure 10 and table 1, from range and water distribution two aspects, contrast former shower nozzle and newly-designed Archimedes spiral curve shower nozzle (the present invention), from experimental result, can show: newly-designed Archimedes spiral curve shower nozzle effectively raises range, make range improve 3.8%, water distribution trend is basically identical.
In sum, the inside bend pipe of the impact driven sprinkler that the method for the present embodiment is designed, curvilinear structures is simple, scientific and reasonable, cost is low, can effectively reduce hydraulic loss and the energy loss of impact driven sprinkler flow field, sprinkler pattern range and flow have been improved, thereby improved shower nozzle irrigation control area, reduced the cost of combination spray irrigation system, and reached the object of saving water resource.
Claims (2)
1. the method for designing of the inside bend pipe structure of an impact driven sprinkler, it is characterized in that, the method is designed to Archimedes spiral formula by the circle arc curve of the inner bend pipe of former impact driven sprinkler, and the transition between auxiliary jet and entrance is expanded or dwindles processing;
The equation of described Archimedes spiral under polar coordinates is r=0.861 θ, wherein 0< θ <35.96.
2. the method for claim 1, is characterized in that, described transition expands or dwindles and is of a size of 1mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310562322.0A CN103691604B (en) | 2013-11-11 | 2013-11-11 | The method for designing of the inner bend pipe structure of a kind of impact driven sprinkler |
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| CN201310562322.0A CN103691604B (en) | 2013-11-11 | 2013-11-11 | The method for designing of the inner bend pipe structure of a kind of impact driven sprinkler |
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| CN103691604A true CN103691604A (en) | 2014-04-02 |
| CN103691604B CN103691604B (en) | 2015-09-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105468819A (en) * | 2015-11-13 | 2016-04-06 | 江苏大学 | Method for optimizing working parameters of vertical impact sprinkler by response surface methodology |
| CN110044233A (en) * | 2019-05-16 | 2019-07-23 | 沈阳飞机工业（集团）有限公司 | Contactless arm parts free travel checks measuring instrument and its application method |
| CN114287376A (en) * | 2021-12-28 | 2022-04-08 | 湖北海洋工程装备研究院有限公司 | Aerodynamic self-rotating scattering device |
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| US4228956A (en) * | 1978-11-30 | 1980-10-21 | Eaton Corporation | Irrigation system and fluid dispersion nozzle |
| GB2138704A (en) * | 1983-05-02 | 1984-10-31 | Rain Bird Sprinkler Mfg | Impact Drive Sprinkler |
| US4537356A (en) * | 1984-05-07 | 1985-08-27 | Rain Bird Sprinkler Mfg. Corp. | Drive assembly for a reaction drive sprinkler |
| US5090621A (en) * | 1990-12-26 | 1992-02-25 | Rain Bird Sprinkler Mfg. Corp. | Constant drive nozzle for impulse irrigation sprinklers |
| CN101898178A (en) * | 2009-05-29 | 2010-12-01 | 雷鸟有限公司 | Spray equipment and method thereof with variable arc and flow |
| CN102294309A (en) * | 2011-08-16 | 2011-12-28 | 西北农林科技大学 | Method for preparing elevation-adjustable rocker arm type irrigating spray head of flexible elbow pipe |
-
2013
- 2013-11-11 CN CN201310562322.0A patent/CN103691604B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4228956A (en) * | 1978-11-30 | 1980-10-21 | Eaton Corporation | Irrigation system and fluid dispersion nozzle |
| GB2138704A (en) * | 1983-05-02 | 1984-10-31 | Rain Bird Sprinkler Mfg | Impact Drive Sprinkler |
| US4537356A (en) * | 1984-05-07 | 1985-08-27 | Rain Bird Sprinkler Mfg. Corp. | Drive assembly for a reaction drive sprinkler |
| US5090621A (en) * | 1990-12-26 | 1992-02-25 | Rain Bird Sprinkler Mfg. Corp. | Constant drive nozzle for impulse irrigation sprinklers |
| CN101898178A (en) * | 2009-05-29 | 2010-12-01 | 雷鸟有限公司 | Spray equipment and method thereof with variable arc and flow |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105468819A (en) * | 2015-11-13 | 2016-04-06 | 江苏大学 | Method for optimizing working parameters of vertical impact sprinkler by response surface methodology |
| CN105468819B (en) * | 2015-11-13 | 2019-10-01 | 江苏大学 | A method of optimizing vertical rocker-arm formula spray head running parameter using response phase method |
| CN110044233A (en) * | 2019-05-16 | 2019-07-23 | 沈阳飞机工业（集团）有限公司 | Contactless arm parts free travel checks measuring instrument and its application method |
| CN110044233B (en) * | 2019-05-16 | 2024-03-08 | 沈阳飞机工业（集团）有限公司 | Non-contact rocker arm part free travel checking measuring instrument and use method thereof |
| CN114287376A (en) * | 2021-12-28 | 2022-04-08 | 湖北海洋工程装备研究院有限公司 | Aerodynamic self-rotating scattering device |
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| CN103691604B (en) | 2015-09-23 |
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Granted publication date: 20150923 Termination date: 20161111 |