CN101596504B

CN101596504B - Inner tooth-tooth form runner water conservation irrigator

Info

Publication number: CN101596504B
Application number: CN200910023158XA
Authority: CN
Inventors: 魏正英; 倪径达; 唐一平; 卢秉恒; 牛文全
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2009-07-01
Filing date: 2009-07-01
Publication date: 2011-04-06
Anticipated expiration: 2029-07-01
Also published as: CN101596504A

Abstract

An inner tooth-tooth form runner water conservation irrigator comprises an irrigator and a runner arranged in the interior of the irrigator. Different from the form of constant inside diameter of previous labyrinth runner, the section of the runner is changed in the invention, so that water produces different pressures while flowing through different regions and a pressure difference between the front and rear of the runner is formed, thus achieving the aim of energy dissipation; meanwhile main runner is straight so as to well relief blocking.

Description

A kind of inner tooth-tooth form flow passage water-saving douche

Technical field

The invention belongs to mechanical manufacturing field, particularly a kind of inner tooth-tooth form flow passage water-saving douche that is applied in the agricultural water-saving irrigation equipment.

Background technology

Drip irrigation technique is the most effective high-efficient irrigation technology in the present water-saving irrigation, but also is " the most expensive irrigation technique ".The operating pressure that drip irrigation system is general is 10 meters heads, and when when minute-pressure (5 meters below the head), its material that can reduce irrigation system water distribution pipeline road requires and douche thickness, thereby reduces investment outlay significantly and reduce cost.Water-saving douche is installed 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 water saving of minute-pressure at present water dropper all adopts the version of normal pressure lower flow channel, under the minute-pressure condition, for reaching effect of energy dissipation, usually increased the unit number of labyrinth flow-path, it is long-pending perhaps to reduce cross section of fluid channel, and this has just caused the raising of manufacturing cost, has also increased the obstruction probability simultaneously.

Summary of the invention

The objective of the invention is to overcome the shortcoming of above-mentioned traditional minute-pressure water saving water dropper runner form, proposed a kind ofly can realize minute-pressure downforce discharge relation and the optimized inner tooth-tooth form flow passage water-saving douche of anti-clogging.

For achieving the above object, the technical solution used in the present invention is: some the runners that are interconnected that comprise douche and be opened in douche inside, said runner are the inner tooth-tooth form runner that the cross section constantly changes.

Runner of the present invention) length is 0.5mm, and the slot width is 0.5mm, and wide mouthful of width is 1mm, and flow direction is to wide mouthful by slot.

The constant form in cross section in the present invention's labyrinth flow-path different from the past adopts the variable cross-section design, and according to fluid mechanics principle, in the same runner, the little place of sectional area flow velocity is fast, and pressure is low, and sectional area general goal flow velocity is slow, the pressure height.Produce pressure differential thus between slot and wide mouth, the sharp corner formation vortex at runner plays the effect of energy dissipating.Simultaneously, because main channel is straight, the particle of flowing through is difficult for because inertia is dumped into low regime, has therefore reduced the obstruction odds.

Description of drawings

Fig. 1 is a flow passage structure schematic diagram of the present invention, and wherein Fig. 1 a is the cellular construction figure of inner tooth-tooth form runner, and Fig. 1 b is the overall diagram of interior trapezoidal runner;

Fig. 2 is an inner tooth-tooth form flowpath pressure discharge relation curve map of the present invention, and wherein abscissa is a pressure, and ordinate is a flow;

Fig. 3 is an inner tooth-tooth form flowpath pressure distribution map of the present invention;

Fig. 4 is an inner tooth-tooth form runner speed vector figure of the present invention;

Fig. 5 is an inner tooth-tooth form runner motion pattern of the present invention;

Fig. 6 is an inner tooth-tooth form runner density profile of the present invention;

Fig. 7 is inner tooth-tooth form runner particle trajectory figure of the present invention.

The specific embodiment

Below in conjunction with accompanying drawing the present invention is described in further detail.

Referring to Fig. 1, the present invention is based on the integrated quick development platform technology of minute-pressure douche, the some groups of runners that are interconnected that comprise douche and be opened in douche inside, runner is the inner tooth-tooth form runner that the cross section constantly changes, and its length is 0.5mm, and the slot width is 0.5mm, wide mouthful of width is 1mm, flow direction is that flow channel depth is 0.5mm by extremely wide mouthful of slot, and unit number is 70.Utilize Parametric CAD software PRO/E moulding,, determined its unit size and unit number, make it that (5m head) flow reaches 1.99L/h under the minute-pressure condition, satisfied designing requirement (2L/h is following) through two phase flow CFD simulated experiment.

Whether reliable the structural design of minute-pressure douche directly have influence on the quality of drip irrigation system work and the quality of pouring water, the labyrinth flow-path douche 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 sensitiveness (reduce water pressure fluctuations influence to douche flow size) of douche flow to pressure.After pressure flow enters douche,, 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 douche energy dissipating.The basic demand of minute-pressure douche be water yield little, evenly stablize, performance of anti-blockage is good, and is simple in structure, cheap.Working head (hydraulic pressure) is generally below the 5m, and water flow is below 2L/h.

Important different of the present invention and other minute-pressure runners be its continuous variation by interior cross section form adverse current to pressure differential, reach the purpose of energy dissipating.

Volume forecasting of inner tooth-tooth form runner and two-phase simulated flow analysis

The volume forecasting of inner tooth-tooth form runner

Referring to Fig. 2, in CFD analysis software FLUENT, the grid runner is carried out the single-phase flow analytical calculation, obtain the flow of runner under different pressures, simulate the pressure flow relation curve of grid runner according to this series data.The pressure flow relation of runner is respectively Q=0.1839H ^0.6128,, the fluidised form index is 0.6128, determines that it is turbulent runner.

Referring to Fig. 3, observe pressure-plotting as can be known, pressure increases and evenly reduces with unit number, and this just provides theoretical foundation for the serial runner by increase and decrease unit number design different flow.But in a unit, the pressure of the wide mouthful sharp corner of runner will be higher than the slot place, also just provides possible for the formation of eddy current.

Referring to Fig. 4, observe speed vector figure as can be known, main channel is a high velocity in the runner, and width is basic identical with the slot width, and sharp corner is a low regime, forms vortex.

Referring to Fig. 5, observe motion pattern as can be known, streamline circles round at sharp corner, has verified the imagination at the beginning of designing.

Inner tooth-tooth form runner two-phase simulated flow is analyzed

By two-phase simulated flow, can learn the anti-clogging of minute-pressure runner.

Referring to Fig. 6, observe density profile as can be known, density mainly is distributed in the runner main channel, and ion concentration height in the main channel is described, and flows out runner with current, therefore is difficult for resulting in blockage.

Referring to Fig. 7, observe particle running orbit in runner, can obtain the particle deposition conditions, show that by following the tracks of particle tracked particle equal escapement ratio in runner is 99.2%, has further verified the anti-clogging of grid runner.

Claims

1. inner tooth-tooth form flow passage water-saving douche, comprise and be opened in the inner some groups of runners that are interconnected (2) of douche (1), it is characterized in that: the inner tooth-tooth form runner that said runner (2) constantly changes for the cross section, and runner (2) length is 0.5mm, the slot width is 0.5mm, wide mouthful of width is 1mm, and flow direction is to wide mouthful by slot.