CN1214707C - Method for integrated fast developing of water saving water irrigator - Google Patents

Abstract

The present invention discloses a method of the integral and fast development of a water-saving water irrigator. Fast forming and manufacturing technology is applied to the development of the water-saving water irrigator. According to the structural characteristic of the water irrigator, the design of the integral water irrigator is put forward. An outer pipe of the water irrigation device and the water irrigation device are in integral forming, the integral and fast experiment prototype of the water irrigator is manufactured, the integral and fast experiment prototype directly enters the pipeline to carry out the hydraulic performance experiment of the water irrigator, and the method for the integral and fast development of the water-saving water irrigator is formed. The present invention has no need of processing moulds of the water irrigator, and can realize the fast forming of the water irrigator.

Description

A kind of integrated structure of water-saving douche

Technical field

The invention belongs to mechanical manufacturing field, particularly a kind of method that is applied to the integrated quick exploitation of water-saving douche in the agricultural water-saving irrigation equipment.

Background technology

Water-saving douche is mounted on the final stage pipeline in drip irrigation system field, according to the needs of crop for moisture, the press water that aqueduct is transported is according to needed moisture of plant growth and nutriment, evenly slowly and exactly being delivered directly near the crop root the soil with less flow, is the critical component in the drip irrigation system.The exploitation of water-saving douche will need design irrigators such as water and water quality environment according to crops, also need the die sinking tool then, makes exemplar and carries out the pressure-flow experiment, the reasonability of checking irrigator design.The typing of a product needs several times to revise repeatedly.This process cycle is long, expense is high (especially in the Mould Machining stage), has restricted the exploitation of new product.Traditional exploitation route is also adopted in the development of present domestic micro-irrigation emitter: designing requirement → irrigator drawing → mould design → Mould Machining → injection moulding experiment → modification → typing, such production procedure single cycle time is 3～May, cost is 4～50,000 yuan, if and test finds that the part performance is not all right, must revise from mould, even the mould risk of scrapping in addition, cost is very high.The restriction that the problem of excessive cycle is serious the independent development of seriation drip irrigation product.

Summary of the invention

Purpose of the present invention is in the method that the integrated quick exploitation of water-saving douche that a kind of design cycle is short, cost is low is provided.

For achieving the above object, the method that the present invention adopts is: at first according to design discharge, operating pressure and hydrodynamics loss of flood peak formula $h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{fi}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}$ The theoretical parameter that calculates the irrigator runner is cross sectional shape, length, carries out the Preliminary design of labyrinth runner, h in the formula _FiIt is the linear loss of i section; h _{ζ k}It is the k local losses; M is the prismatic hop count of pipeline; N is the number of pipeline local losses;

Linear loss h wherein _FiBe directly proportional with length,

For laminar flow conditions $h_f={\mathrm{\λ}}_1\·\frac{l}{4R}\·\frac{V^2}{2g}$

For turbulent situation $h_f={\mathrm{\λ}}_2\·\frac{l}{4R}\·\frac{V^2}{2g}$

Wherein: $V=\frac{q}{A},$ ${\mathrm{\λ}}_1=\frac{64}{\mathrm{Re}},$ $\mathrm{Re}=\frac{4\mathrm{VR}}{v},$ ${\mathrm{\λ}}_2=0.11{(\frac{\mathrm{\Δ}}{4R}+\frac{68}{\mathrm{Re}})}^{0.25}$

λ is the on-way resistance coefficient; V is the kinematic viscosity coefficient of fluid; A is that cross section of fluid channel is long-pending; V is the cross section mean flow rate; L is the dropper flow channel length; G is an acceleration of gravity; Q is a flow; Re is a Reynolds number;

Local losses $h_{\mathrm{\ζ}}=\mathrm{\ζ}\·\frac{v^2}{2g}$ ζ is the local losses coefficient

For the irrigator runner of rectangular cross sectional shape, flow performance size water intaking power radius R in the rectangularl runner, it amasss for fluid cross-section and wetted perimeter is the ratio of the girth of fluid and solid boundaries contact portion, if long and wide a and the b of being respectively, then

$R=\frac{a\·b}{2(a+b)}$

Refer generally to square, oval, triangle and analogous shape for non-peculiar tee section pipe, linear loss and local losses be available stream mechanics loss of flood peak formula still $h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{ji}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}$ Calculate;

According to the theoretical parameter of runner length with the irrigator runner, wide, height is made as parameterized variables, form irrigator parametrization structure, on the irrigator cad model, determine its parting line and die joint, at first generate outer pipe with solid modelling software Pro-E, using " Feature-Create-Cut-Extrude; Solid " order again is the maze trough that the die sinking direction is cut formation pipe both sides along parting direction, pipe in pipe, generating then, in like manner also use " Cut " order in interior pipe both sides, cut out into water filtration grid along the die sinking direction, use " Feature-Create-Solid-Protrusion-Revolve; Solid " on interior pipe circumference, to make the water proof district and the exhalant region flange at dropper two ends at last;

Design one outer tube is designed to one with irrigator and outer tube outside irrigator 3D solid cad model, is about to the direct embedding of irrigator, is attached on the outer tube wall, forms irrigator and the incorporate design of outer tube;

Applying fast-forming produces the integrated experimental prototype of irrigator, the integrated experimental prototype of irrigator is connected with water-supply-pipe, directly the access flow experimental bench experimentizes, data are revised the structural design of irrigator by experiment, promptly the parameterized variables length is revised, with the quick checking of realization irrigator runner and the fast shaping of irrigator structure.

Because the present invention is applied to the quick shaping manufacturing to economize on water in the irrigator exploitation, design feature according to irrigator, with irrigator outer tube and irrigator integrated molding, produce the integrated quick experiment prototype of irrigator, directly insert pipeline and carry out the experiment of irrigator hydraulic performance, form the method for the integrated quick exploitation of water-saving douche, need not to process the fast shaping that the irrigator mould just can be realized irrigator.

Description of drawings

Fig. 1 is a flow chart of the present invention;

Fig. 2 is the structure chart of labyrinth type dropper of the present invention miscarriage, and wherein Fig. 2 (a) is dropper runner form figure, and Fig. 2 (b) is the dropper upper runner expanded view of arranging;

Fig. 3 is the dropper structural design drawing of the present invention towards technology, wherein Fig. 3 (a) be can't die sinking structure chart, Fig. 3 (b) is a structure chart of being convenient to die sinking;

Fig. 4 is dropper CAD physical model figure of the present invention;

Fig. 5 is that sheet CAD physical model figure is dripped in the present invention;

Fig. 6 is the integrated experiment irrigator of the present invention 3D solid cad model figure, and wherein Fig. 6 (a) is the integrated cad model figure of dropper, and Fig. 6 (b) drips the integrated cad model figure of sheet;

Fig. 7 is the integrated making flow chart of irrigator prototype of the present invention;

Fig. 8 is irrigator of the present invention and integrated irrigator experimental prototype figure thereof, and wherein Fig. 8 (a) is the dropper prototype figure, and Fig. 8 (b) is the integrated experimental prototype figure of dropper, and Fig. 8 (c) drips the sheet prototype figure, and Fig. 8 (d) drips the integrated experimental prototype figure of sheet;

Fig. 9 is an irrigator hydraulic performance experimental bench of the present invention, and wherein Fig. 9 (a) is the integrated irrigator connection configuration of experimental bench figure, and Fig. 9 (b) is the dropper upper runner expanded view of arranging;

Figure 10 is that the typical irrigator CAD of the present invention designs a model and integrated prototype and hydraulic performance curve thereof, Figure 10 (a) is a pipe following formula irrigator, and Figure 10 (b) is that sheet is dripped in the circular arc labyrinth, and Figure 10 (c) is that anti-stifled labyrinth flow-path drips sheet, wherein abscissa is a pressure, and ordinate is a flow.

Embodiment

Below in conjunction with accompanying drawing structural principle of the present invention and operation principle are described in further detail.

Referring to Fig. 1, the present invention is at first according to design discharge and operating pressure, and the theoretical parameter that the applied fluid mechanics principle is calculated runner is cross sectional shape, length, carries out the Preliminary design of labyrinth runner; According to the theoretical parameter of runner length with the dropper runner, wide, high and fillet is designed to parametrization, form the irrigator Parameterization Structural Design, on the dropper cad model, determine its parting line and die joint, at first generating external diameter with solid modelling software Pro-E is m, internal diameter is the pipe of n, using " Feature-Create-Cut-Extrude; Solid " order again is the maze trough that the die sinking direction is cut formation pipe both sides along parting direction, generating external diameter then in pipe is m1, internal diameter is the interior pipe of n1, in like manner also use " Cut " order in interior pipe both sides, cut out into water filtration grid along the die sinking direction, use " Feature-Create-Solid-Protrusion-Revolve; Solid " on interior pipe circumference, to make water proof district and the exhalant region flange of the high h in dropper two ends at last; Design one outer tube is designed to one with irrigator and outer tube outside irrigator 3D solid cad model, is about to the direct embedding of irrigator, is attached on the outer tube wall, forms irrigator and the incorporate design of outer tube; Applying fast-forming produces the integrated experimental prototype of irrigator, the integrated experimental prototype of irrigator is connected with water-supply-pipe, directly the access flow experimental bench experimentizes, data are revised the structural design of irrigator by experiment, with the quick checking of realization irrigator runner and the fast shaping of irrigator structure.

The irrigator structural design

Whether reliable the structural design of irrigator directly have influence on the quality of drip irrigation system work and the quality of pouring water, the labyrinth flow-path irrigator has the superior performance of pouring water, its operation principle is to utilize complicated flow path boundary to form the loss of flood peak and energy dissipating, reduces the susceptibility (reduce water pressure fluctuations influence to irrigator flow size) of irrigator flow to pressure.After pressure flow enters irrigator,, splash into soil, guarantee that liquid manure has close flow at the position of respectively feeding water of pipeline (hydraulic pressure difference), make whole irrigation region that uniform water distribution be arranged with stable, uniform low discharge through the irrigator energy dissipating.The basic demand of irrigator be water yield little, evenly stablize, performance of anti-blockage is good, and is simple in structure, cheap.Drip irrigation working head (hydraulic pressure) is generally 5-15m, and generally between 0.3-2.0mm, water flow changes between 2-200L/h the water flow passage diameter excessively.

Labyrinth type irrigator runner design theory foundation

Labyrinth flow-path is the superior runner form of performance in the irrigator runner form of using at present, its flow path boundary by complexity makes wherein current disorder to reach the purpose of stablizing hydraulic pressure and energy dissipating, reduce the fluidised form index thereby reach, to reduce the susceptibility of flow to pressure, improve uniformity of irrigation water appilcation, so also can reduce flow channel length greatly, reduce the irrigator manufacturing cost.On the basis of simplifying the irrigator structure, reduce the common objective that the fluidised form index is domestic and international drip irrigation designer.Flow path boundary is complicated more, energy dissipating is abundant more, the fluidised form index is more little, although the labyrinth flow-path border is very complicated certainly, all to form by straight line and circular arc, the complexity of these flow path boundary is always limited, because employed is that curve in the euclidean geometry is as the border of runner, the segmentation always of resulting flow path boundary can be led continuously, and this ability that makes current disorder wherein also is limited, and the fluidised form index of labyrinth flow-path is all more than 0.45 usually.But the flow path boundary complexity is subject to processing the constraint of manufacturing technology, because the big cost of manufacture difficulty will increase.

Because flow passage entry pressure is bigger,, requires runner the flow under this pressure can be reduced to and adhere to specification the viscosity resistance of water body in order to realize Small Flow Control.The factor that influences the runner viscosity resistance mainly contains: the cross sectional shape of runner, length and runner move towards shape.In addition when the design runner, should make the flow channel shape fairing and consider the processing technology of mould, eliminate the structure wedge angle of runner junction and turn round suddenly, to avoid occurring local vortex region, form the stagnation region that flows because of vortex region speed is extremely low, this can cause in the water solid granulates deposition, and causes growing of microorganism and block runner.According to fluid mechanics principle, fluid water wherein belongs to the incompressible continuous fluid of viscosity, can be according to design discharge and operating pressure, and the applied fluid mechanics principle is calculated the theoretical parameter (cross sectional shape, length) of runner, carries out the Preliminary design of labyrinth runner.

The loss of flood peak of drip emitter is that the local resistance by the viscosity resistance of runner tube wall and runner causes that according to the principle of stacking of the loss of flood peak, total loss of flood peak is:

$h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{fi}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}---\left(1\right)$

H in the formula _FiIt is the linear loss of i section; h _{ζ k}It is the k local losses;

M is the prismatic hop count of pipeline; N is the number of pipeline local losses.

The irrigator cross section of fluid channel is shaped as rectangle, belongs to the on-circular cross-section pipe, flow performance size water intaking power radius R in the rectangularl runner, its ratio long-pending for fluid cross-section and wetted perimeter (girth of fluid and solid boundaries contact portion), for the square-section, if long and wide a and the b of being respectively, then

$R=\frac{a\·b}{2(a+b)}---\left(2\right)$

For non-peculiar tee section pipe (referring generally to square, oval, triangle and analogous shape), linear loss and local losses are still available $h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{fi}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}$ Formula calculates, as long as the caliber d in the formula is substituted with 4R.

(1) linear loss

Linear loss is that the frictional resistance of runner wall and the energy loss that causes are directly proportional with length.

For laminar flow conditions $h_f={\mathrm{\λ}}_1\·\frac{l}{4R}\·\frac{V^2}{2g}---\left(3\right)$

For turbulent situation $h_f={\mathrm{\λ}}_2\·\frac{l}{4R}\·\frac{V^2}{2g}---\left(4\right)$

Wherein: $V=\frac{q}{A},$ ${\mathrm{\λ}}_1=\frac{64}{\mathrm{Re}},$ $\mathrm{Re}=\frac{4\mathrm{VR}}{v},$ ${\mathrm{\λ}}_2=0.11{(\frac{\mathrm{\Δ}}{4R}+\frac{68}{\mathrm{Re}})}^{0.25}$

λ is the on-way resistance coefficient in the formula; ν is the kinematic viscosity coefficient of fluid; A is that cross section of fluid channel is long-pending;

V is the cross section mean flow rate; L is the dropper flow channel length; G is an acceleration of gravity; Q is a flow;

Re is a Reynolds number, the fluidised form of its decision fluid, and fluidised form is divided into laminar flow and turbulent flow (turbulent flow), thinks on the common engineering: Re＜Re _c=2100 o'clock, fluid was a laminar flow; Re＞Re _c=2100 o'clock, fluid was a turbulent flow.Wherein: Re _cBe the lower critical Reynolds number.

(2) local losses

Local losses is the fluid in the runner when flowing through local disturbance's (pipe joint, elbow, gate valve and neck sudden change place), because boundary shape sharply changes, fluid micellar bumps, and produces the loss that vortex etc. causes energy.

$h_{\mathrm{\ζ}}=\mathrm{\ζ}\·\frac{v^2}{2g}---\left(5\right)$

ζ is local losses coefficient (relevant with channel size).

Flow one is regularly determined cross sectional shape earlier according to actual conditions, and computational length also can determine cross sectional shape according to length again.This with labyrinth type in the edge tubular type irrigator (abbreviation dropper) be that example designs and experimental analysis.

The design of labyrinth type irrigator flow passage structure

The runner channel theory calculates the theoretical parameter that can determine runner, also provides foundation for irrigator CAD structural design.Edge tubular type irrigator (abbreviation dropper) design condition is rated pressure Pn=100Kpa in the labyrinth type, irrigator design discharge q=4L/h.

Labyrinth flow-path can be arranged 8～9 rows at the dropper circumference as calculated, consider that every row's joint forms the pressure loss that elbow causes, labyrinth flow-path is arranged 8 rows, unit, 6 labyrinths of every row, the labyrinth flow-path unit number is 48 like this, and every current drainage road couples together with arc transition, avoids unexpected turning and pointed design, to eliminate the mobile stagnation region in the runner, form circular arc type labyrinth flow-path design form shown in Fig. 2 (a).

The integrated CAD design of labyrinth type irrigator

The very complicated and time consumption because the fineness requirement of the labyrinth of irrigator labyrinth flow-path, die sinking tool experimentize.Finalize the design as early as possible for the irrigator structure that makes design, consider the structure and the actual handling characteristics of irrigator, RP technique (RP﹠amp; M) be applied in the exploitation of drip emitter, innovation ground proposes the thought of " integrated " irrigator, with irrigator outer tube and irrigator integrated molding, form the integrated experimental prototype of irrigator, can directly insert the discharge experimental bench and experimentize, need not the die sinking tool and realize the fast shaping of irrigator.When the irrigator CAD of labyrinth, just itself and outer tube are formed integrated cad model like this, be used for quick shaping and make " integrated " irrigator.

Water-saving douche CAD structural design

Consult domestic and international existing labyrinth type irrigator structure and its runner arrangement form, and with reference to inlaying the requirement of irrigator and outer pipe integrated assembling line in the domestic existing to the irrigator structural parameters, carry out the irrigator general structure design, edge dropper structural design expanded view in this labyrinth type is shown in Fig. 2 (b).

Consider the complexity of actual environment for use, the runner parameter that calculates may need to revise, so parameterized version is adopted in the CAD design.With the geometric shape parameters (as height, width, inclination angle etc.) of cross section of fluid channel with move towards form parameter as variable parameter, can revise these parameters according to result of the test subsequently and obtain rational cad model, and needn't rebuild cad model owing to result of the test is undesirable.Software uses the parametrization three-dimensional CAD solid modelling software PRO-E based on feature to make up labyrinth type dropper cad model at this, is convenient to carry out by experiment in the future remodifying of irrigator cad model.

The design of irrigator must take into full account the processability of product structure of manufacturing of irrigator mould and die sinking, the design of general irrigator is to launch design runner or net grid by plane, during three dimensional design, with plane outspread drawing by three-dimensional backrush design be converted into three-dimensional structure, such structure is rational in theory, but when the actual mould die sinking, because the side of runner is for pointing to the radial surface in the dropper center of circle, the mould structure of two bodies can't be realized die sinking up and down, interfere phenomenon, mould structure must be multimode cavity combination radially, need the demoulding campaign of a plurality of side core-drawing mechanisms during die sinking, increased manufacturing cost greatly, even can't realize that (Fig. 3 a).

For the ease of the somatotype and the die sinking of mould, carry out dropper CAD design towards manufacturing process, structure is shown in Fig. 3 (b).Its design procedure is as follows: at first determine its parting line and die joint on the dropper cad model.At first generate external diameter 16mm with solid modelling software Pro-E, the pipe of internal diameter 14mm, using " Feature-Create-Cut-Extrude; Solid " order again is the maze trough that the die sinking direction is cut formation pipe both sides along parting direction, in pipe, generate external diameter 14mm then, the interior pipe of internal diameter 12.8mm, in like manner also use " Cut " order in interior pipe both sides, cut out into water filtration grid along the die sinking direction, use " Feature-Create-Solid-Protrusion-Revolve; Solid " on interior pipe circumference, to make water proof district and the exhalant region flange of the high 1mm in dropper two ends at last.During the RP prototype fast mould made of this dropper cad model like this, just die sinking and taking-up RP prototype (Fig. 3 b) smoothly.When the dropper Injection Mold Design, be convenient to realize the mould structure of two bodies up and down like this, help die sinking.Be designed to parametrization at this size length and fillet, form irrigator Parameterization Structural Design scheme the dropper runner.Dropper entity cad model as shown in Figure 4.In like manner the entity cad model as shown in Figure 5 for chip irrigator (dripping sheet).

After water-saving douche runner and structural design are finished, will carry out the experiment of irrigator discharge, whether meet the requirement of irrigator GB with the check design.When carrying out the experiment of irrigator discharge, the irrigator that processes must be pressed in the irrigate band on the production line of irrigate band.Traditional method is still out steel mold, the processing exemplar, and the old stuff road of pouring water experiment test and reprocessing mould, and advanced RP technique provides new approach for this reason.

Referring to accompanying drawing 4,5, the present invention takes into full account the easy to operate and feasibility of drip irrigation experiment, design feature in conjunction with irrigator, the innovative idea of " integrated " irrigator is proposed first, directly outside irrigator 3D solid cad model, design an outer tube, irrigator and outer tube are designed to one, are about to the direct embedding of irrigator (subsides) on outer tube wall, form irrigator and the incorporate design of outer tube (Fig. 6).Applying fast-forming manufacturing technology (Fig. 7) is produced the integrated experimental prototype of irrigator (Fig. 8).By irrigator runner forming accuracy test and statistical analysis, satisfy desired accuracy of manufacture scope based on the integrated irrigator prototype of RP technology, prove that RP technique can be used for irrigator exploitation.

So just formed the irrigator integral quick forming method, the integrated experimental prototype of irrigator can be connected with water-supply-pipe, directly access flow experimental bench (Fig. 9) experimentizes.Data are revised the structural design of irrigator product by experiment, with the quick checking of realization irrigator runner and the fast shaping of irrigator structure.

According to the integrated quick development method of water-saving douche, can finish the making and the flow performance experiment of various typical irrigator CAD designs and integrated rapid prototyping.Typical irrigator cad model and its integrated prototype and hydraulic performance curve thereof are illustrated in fig. 10 shown below.

Because the present invention is according to the design feature of irrigator, the thought of " integrated " irrigator is proposed, with irrigator outer tube and irrigator integrated molding, produce the integrated quick experiment prototype of irrigator, directly insert pipeline and carry out the experiment of irrigator hydraulic performance, form the integrated quick development method of water-saving douche, need not to process the fast shaping that the irrigator mould just can be realized irrigator.

This method is a core with hydrodynamics calculating, integral quick forming, form the closed-loop control of product development process, thereby shortened designing and developing the cycle of product greatly, and provide the design verification platform of irrigator product, the application of RP technique can solve the bottleneck problem that manufactures and designs of irrigator fine structure, and design level is improved greatly.

Use the quick development method of water-saving douche, can finish the quick exploitation of the drip emitter of arbitrary shape and complexity, traditional construction cycle can be shortened to 3～5 days by 3～5 months, and cost is reduced to below 2,000 yuan by about 50,000 yuan.The water-saving douche quick development method makes China have saving product of water autonomous Design ability, can develop all kinds of irrigators with independent intellectual property right that are fit to China's national situation fast, supports the great-leap-forward development of China's water-saving agriculture.

Claims (1)

1, a kind of integrated structure of water-saving douche, it is characterized in that by:

1) at first according to design discharge, operating pressure and hydrodynamics loss of flood peak formula $h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{fi}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}$ The theoretical parameter that calculates the irrigator runner is cross sectional shape, length, carries out the Preliminary design of labyrinth runner, h in the formula _FiIt is the linear loss of i section; h _{ζ k}It is the k local losses; M is the prismatic hop count of pipeline; N is the number of pipeline local losses;

Linear loss h wherein _FiBe directly proportional with length,

For laminar flow conditions $h_f={\mathrm{\λ}}_1\·\frac{l}{4R}\·\frac{V^2}{2g}$

For turbulent situation $h_f={\mathrm{\λ}}_2\·\frac{l}{4R}\·\frac{V^2}{2g}$

Wherein: $V=\frac{q}{A},$ ${\mathrm{\λ}}_1=\frac{64}{\mathrm{Re}},$ $\mathrm{Re}=\frac{4\mathrm{VR}}{v},$ ${\mathrm{\λ}}_2=0.11{(\frac{\mathrm{\Δ}}{4R}+\frac{68}{\mathrm{Re}})}^{0.25}$

λ is the on-way resistance coefficient; V is the kinematic viscosity coefficient of fluid; A is that cross section of fluid channel is long-pending; V is the cross section mean flow rate; L is the dropper flow channel length; G is an acceleration of gravity; Q is a flow; Re is a Reynolds number;

Local losses $h_f=\mathrm{\ζ}\·\frac{v^2}{2g}$ ζ is the local losses coefficient

For the irrigator runner of rectangular cross sectional shape, flow performance size water intaking power radius R in the rectangularl runner, it amasss for fluid cross-section and wetted perimeter is the ratio of the girth of fluid and solid boundaries contact portion, if long and wide a and the b of being respectively, then

$R=\frac{a\·b}{2(a+b)}$

Refer generally to square, oval, triangle and analogous shape for non-peculiar tee section pipe, linear loss and local losses be available stream mechanics loss of flood peak formula still $h_w=\underset{i=1}{\overset{m}{\mathrm{\Σ}}}{h}_{\mathrm{fi}}+\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{h}_{\mathrm{\ζk}}$ Calculate;

2) according to the theoretical parameter of runner length with the irrigator runner, wide, height is made as parameterized variables, form irrigator parametrization structure, on the irrigator cad model, determine its parting line and die joint, at first generate outer pipe with solid modelling software Pro-E, using " Feature-Create-Cut-Extrude; Solid " order again is the maze trough that the die sinking direction is cut formation pipe both sides along parting direction, pipe in pipe, generating then, in like manner also use " Cut " order in interior pipe both sides, cut out into water filtration grid along the die sinking direction, use " Feature-Create-Solid-Protrusion-Revolve; Solid " on interior pipe circumference, to make the water proof district and the exhalant region flange at dropper two ends at last; Said method, design one outer tube outside irrigator 3D solid cad model, the design of irrigator and outer tube is as a whole, and this irrigator can be internally-inlaid or manages following formula; With the direct embedding of internally-inlaid irrigator, be attached on the outer tube wall; It is as a whole to manage the design of following formula irrigator and outer tube, and the water supply connector that will manage the following formula irrigator and water-supply-pipe design as a whole, the design of formation irrigator and outer tube integration; Irrigator is provided with anti-stifled labyrinth flow-path; Irrigator integration experimental prototype is connected with water-supply-pipe, directly the access flow experimental bench experimentizes, data are revised the structural design of irrigator by experiment, promptly the parameterized variables length is revised, with the quick checking of realization irrigator runner and the fast shaping of irrigator structure.

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