CN103861752A

CN103861752A - Anti-blockage emitter based on Venturi principle

Info

Publication number: CN103861752A
Application number: CN201410075278.5A
Authority: CN
Inventors: 魏正英; 苑伟静; 楚华丽; 孟昊
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2014-03-03
Filing date: 2014-03-03
Publication date: 2014-06-18
Anticipated expiration: 2034-03-03
Also published as: CN103861752B

Abstract

The invention discloses an anti-blockage emitter based on the Venturi principle, which comprises a grid type water inlet, an anti-blockage labyrinth flow passage based on the Venturi principle and a water outlet. The invention improves the labyrinth flow passage structure and applies the Venturi principle into the flow passage design, and each flow passage unit comprises a reduced section, a throat, a diffusing section and a flow guide section from the throat to the diffusing section. By utilizing added triangular baffles, the invention ensures that formed eddy energy dissipation areas include the flow passage corners as well as the areas near the baffles; moreover, the turning, reduction and expansion of the Venturi tube can cause local head loss, thus enhancing the energy-dissipating capability of the flow passage; meanwhile, by utilizing the high speed generated by the flow guide sections to flush the low-speed and easy-to-block turning diffusing sections, the diffusing sections cannot be easily blocked, and thereby the purposes of energy dissipation and blockage resistance are achieved by the emitter.

Description

Based on the anti-stifled douche of venturi principle

Technical field

The invention belongs to irrigation field, particularly a kind of anti-stifled douche based on venturi principle for agricultural water-saving irrigation.

Background technology

Douche is the core component of drip irrigation project, and the effect of whole drip irrigation project is all embodied by the state of pouring water of douche, and the quality of its hydraulic performance and anti-clogging has greatly determined the quality of integrated engineering benefit.The Main Function of douche is energy dissipating, and the press water (also can be mixed with fertilizer) that aqueduct is transported is evenly transported near crop root in soil lentamente with less flow.For reaching effect of energy dissipation, current douche runner is mostly strong bending and elongated, causes douche break over region easily to stop up, and therefore designs a kind of douche runner that considers energy dissipating ability and anti-stifled ability just necessary.

Summary of the invention

The object of the invention is to overcome the anti-stifled ability of douche in the past, and the shortcoming that only relies on turnover region to carry out energy dissipating, a kind of douche that considers energy dissipating ability and anti-stifled ability has been proposed.

For achieving the above object, the technical solution used in the present invention is: comprise the anti-stifled labyrinth flow-path based on venturi principle with water inlet and delivery port;

The described anti-stifled labyrinth flow-path based on venturi principle comprises some identical flow passage units, each flow passage unit is by contraction section, throat, diffuser and the four part compositions of the Drainage Section from throat to diffuser, and between contraction section and diffuser, be provided with vertical block, diffuser and and Drainage Section between be provided with triangle block.

The throat width of described flow passage unit contraction section is 1.2mm, and flow passage unit is wide is 2.6mm, and height is 3.4mm, and runner top edge width is 1.4mm, and left and right sides fillet is 0.2mm; Obtuse-angulate two edge lengths of triangle block shape are respectively 0.6mm and 1.6mm, obtuse angle is 120 °, the acute angle that the limit that triangle block is the shortest and vertical curve form is 75 °, and triangle block is topmost 0.8mm with the distance of runner top edge, and the distance of high order end and top edge center line is 0.2mm; Vertically the width of block is 0.3mm, be highly 1.5mm, vertically block top two fillets are 0.05mm, and below two fillets are 0.2mm, the distance of the left circular arc left end in below and runner contraction section is 0.6mm, and the contraction section distance of the right circular arc right-hand member in below and next flow passage unit is 1.3mm.

Described water inlet is grid type water inlet.

The present invention has improved labyrinth flow-path structure, and venturi principle is applied in runner design, and each flow passage unit comprises contraction section, throat, diffuser and the Drainage Section from throat to diffuser.The present invention utilizes the triangle block of interpolation, make the region that forms whirlpool energy dissipating not only comprise runner corner, also comprise near block, and the turnover of Venturi tube, convergent and gradually draw together form local head loss, improve runner energy dissipating ability, the fair speed of simultaneously utilizing Drainage Section to form, the lower easily stifled diffusion turn section of flushing speed, make the latter be not easy to produce and stop up, reach the object of douche energy dissipating and anti-obstruction.

Brief description of the drawings

Fig. 1 is overall structure schematic diagram of the present invention;

Fig. 2 is the anti-stifled douche flow passage unit structure chart that the present invention is based on venturi principle;

Fig. 3 be the present invention is based on venturi principle anti-stifled douche Ya Li ?discharge relation curve, wherein abscissa is pressure, ordinate is flow.

Detailed description of the invention

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

Referring to Fig. 1, the present invention includes the anti-stifled labyrinth flow-path 7 based on venturi principle with grid type water inlet 2 and delivery port 1; Anti-stifled labyrinth flow-path 7 based on venturi principle comprises some identical flow passage units, each flow passage unit is by contraction section 3, throat 4, diffuser 5 and the 6 four part compositions of the Drainage Section from throat to diffuser, and between contraction section 3 and diffuser 5, be provided with vertical block 9, diffuser 5 and and Drainage Section 6 between be provided with triangle block 8.

Referring to Fig. 2, the throat width of flow passage unit contraction section 3 of the present invention is 1.2mm, and flow passage unit is wide is 2.6mm, and height is 3.4mm, and runner top edge width is 1.4mm, and left and right sides fillet is 0.2mm; Obtuse-angulate two edge lengths of triangle block 8 shapes are respectively 0.6mm and 1.6mm, obtuse angle is 120 °, the acute angle that the limit that triangle block 8 is the shortest and vertical curve form is 75 °, triangle block 8 is topmost 0.8mm with the distance of runner top edge, and the distance of high order end and top edge center line is 0.2mm; Vertically the width of block 9 is 0.3mm, be highly 1.5mm, vertically block 9 top two fillets are 0.05mm, and below two fillets are 0.2mm, the distance of the left circular arc left end in below and runner contraction section 3 is 0.6mm, and contraction section 3 distances of the right circular arc right-hand member in below and next flow passage unit are 1.3mm.

Referring to Fig. 3, in CFD analysis software FLUENT, carried out the hydraulic performance simulation of the anti-stifled douche based on venturi principle, obtained the flow of douche under different pressures, and simulate Ya Li ?discharge relation curve, its relational expression is Q=0.2138H ^0.5176, flow stance index is 0.5176, hydraulic performance is good.Pressure increases and reduces with unit number, and the energy dissipating effect of flow passage unit is obvious.Incessantly in runner turning point, and near triangle block, there is the obvious whirlpool in many places, strengthened runner energy dissipating effect, along water (flow) direction, there is larger velocity amplitude at Drainage Section end, contribute to the deposit in this region to be flushed away, ensured the good anti-clogging of douche.

Claims

1. the anti-stifled douche based on venturi principle, is characterized in that: comprise the anti-stifled labyrinth flow-path (7) based on venturi principle with water inlet (2) and delivery port (1);

The described anti-stifled labyrinth flow-path (7) based on venturi principle comprises some identical flow passage units, each flow passage unit is by contraction section (3), throat (4), diffuser (5) and (6) the four part compositions of the Drainage Section from throat to diffuser, and between contraction section (3) and diffuser (5), be provided with vertical block (9), diffuser (5) and and Drainage Section (6) between be provided with triangle block (8).

2. the anti-stifled douche based on venturi principle according to claim 1, it is characterized in that: the throat width of described flow passage unit contraction section (3) is 1.2mm, flow passage unit is wide is 2.6mm, and height is 3.4mm, runner top edge width is 1.4mm, and left and right sides fillet is 0.2mm; Obtuse-angulate two edge lengths of triangle block (8) shape are respectively 0.6mm and 1.6mm, obtuse angle is 120 °, the acute angle that the limit that triangle block (8) is the shortest and vertical curve form is 75 °, triangle block (8) is topmost 0.8mm with the distance of runner top edge, and the distance of high order end and top edge center line is 0.2mm; Vertically the width of block (9) is 0.3mm, be highly 1.5mm, vertically block (9) top two fillets are 0.05mm, below two fillets are 0.2mm, the distance of the left circular arc left end in below and runner contraction section (3) is 0.6mm, and contraction section (3) distance of the right circular arc right-hand member in below and next flow passage unit is 1.3mm.

3. the anti-stifled douche based on venturi principle according to claim 1, is characterized in that: described water inlet (2) is grid type water inlet.