CN2818565Y - Sand lift with rotary impeller in water or underwater - Google Patents

Abstract

The utility model relates to a rotary wing floating type sand lifting device. The utility model is practically used for silt under coastal tide gates. The utility model can utilize motive power of tide or motive power of water body on a dispatching gate of the tide gate, and thus ensures no silt sedimentation under the tide gates. The utility model can also be used for the treatment of rivers and channels. The utility model has the structure that the rotary wing floating type sand lifting device forms a rotary wing type; the length of the rotary wing is 0.5-2 meters, the width is 0.2-1 meter, and the density of the rotary wing is lighter than the density of the water body; the rotary wing is arranged on a y = y/u = 0.1-0.5 Umax part, wherein the y in the formula is the distance away from a river bed, the Umax is the maximum flow rate and the use is the water flow rate at optional point. The utility model has the advantage that the flowing energy of the water body on the bottom is utilized to drive the rotary wing to rotate and start, and thus the silt on the bottom of the river bed is driven to the downstream; as long as the silt of the river bed can be lifted under the condition of the motive power of water body, the utility model can be arranged on optional position under water; as the rotary wing is arranged on the y = y/u = 0.1-0.5 Umax part (the y is the distance away from the river bed, and the U is the maximum flow rate), the utility model can be floated on the optional position of the water body.

Description

Rotor floatable sand device

Technical field

The utility model relates to a kind of silting downstream tidal barrier that is useful for coastal tide-block sluice, can utilize tide dynamic force or utilize water body power on the tide-block sluice scheduling lock, do not deposit under the lock guaranteeing, and can be used for the rotor floatable sand device of river course regulation.

Background technology

In order to resist salt water encroachment, to drain waterlogging, wall is built in the one or both sides, river mouth of being everlasting, and the one, improve flow condition, cut off the beach sand supply source that starts by stormy waves, reduce the sand amount that flood current is carried under one's arms and entered irrigation channel; The 2nd, constraint and stable let out runoff down, constriction channel span and entrance width increase the ebb tide water velocity, and clearing sands with converging flow improves and the stabilization of export depth of water, reduces the purpose that irrigation channel deposits thereby reach.After yet lock is built in the river mouth, changed the dynamic condition in area, river mouth, make tidal level and trend process phase difference occur, duration of rise shortens and the flood strength increasing, duration of fall lengthening and strength of ebb reduces, the quantity of sand and mud that quantity of sand and mud that flood tide brings into is taken out of much larger than ebb tide has changed the equilibrium of sediment transport under original natural situation, river mouth Jian Zha also makes the upstream bleeder quantity reduce, and causes the severe siltation of section under the lock.

Adopt the silt measure of dashing that reduces silting downstream tidal barrier to have waterpower to dash silt, machinery at present towards becoming silted up two kinds, wherein

Waterpower dash to become silted up be meet spring tide to open a sluice gate to dash to become silted up, open a sluice gate to dash during lower high water become silted up, the utilized head difference opens a sluice gate, receives Chao Chong and become silted up.

The machinery desilting is limited at the water source, upstream, the riverbed is harder under the lock, under the situation that is difficult to get excited by current, or in short supply at the water source, upstream, following current is stirred to increase ebb tide or upland water and is taken under the situation of husky amount, drags silt, motor vessel to dig silt, waterpower towards mechanical means desiltings such as the pools with motor vessel.No matter be that waterpower is dashed silt or machinery dashes silt, their common defects is that the human and material resources that drop into are bigger, and it is of short duration or even unconspicuous to change the effect that under the lock deposit in the section.The alluvial situation of section is more and more serious under the lock at present.

Summary of the invention

The present invention distribute according to open-channel flow speed vertical line and the silt sand content along the characteristic of vertical line distribution, and the rotor floatable sand device that is placed in certain depth in the water of design, the energy that utilizes the bottom water body to flow, drive rotor rotation starting, make bottom water body turbulent fluctuation, bring the downstream into thereby realize the riverbed bottom sediment raised.

Technical solution of the present utility model: its structure is that rotor floatable sand device is the rotor shape, the length 0.5-2 rice of rotor, and width 0.2-1 rice, rotor floatable sand device is lighter than water body density, is arranged at y=y|u=0.1-0.5U _MaxThe place, the y in the formula is apart from riverbed distance, U _MaxBe Peak Flow Rate, u is the arbitrfary point water velocity.

Advantage of the present utility model: the energy that utilizes the bottom water body to flow, drive rotor rotation starting, bring the downstream into thereby the riverbed bottom sediment raised; As long as riverbed silt can be raised under the water body dynamic condition, it can be arranged at optional position under water; Because rotor is arranged at y=y|u=0.1～0.5U _MaxPlace's (y is apart from the riverbed distance, and U is a Peak Flow Rate) is so it can rise and fall in the water body optional position;

Description of drawings

Accompanying drawing 1 is the structural representation of two blade rotors.

Accompanying drawing 2 is structural representations of three blade rotors.

Among the figure 1 is leaf.

The specific embodiment

Its structure is that rotor floatable sand device is the rotor shape, the length 0.5-2 rice of rotor, and width 0.2-1 rice, lighter than water body density, be arranged at y=y|u=0.1-0.5U _MaxThe place, the y in the formula is apart from riverbed distance, U _MaxBe Peak Flow Rate, u is the arbitrfary point water velocity;

The water velocity vertical line distributes, outstanding husky sand content is selected for use respectively along vertical line distribution, Incipient Velocity of Sediment Transport:

Formula of incipient velocity:

$U_c={\left(\frac{h}{D}\right)}^{1/6}\·{[3.2\frac{{\mathrm{\γ}}_s-\mathrm{\γ}}{\mathrm{\γ}}\mathrm{gD}+{\left(\frac{{\mathrm{\γ}}_b}{{\mathrm{\γ}}_{b0}}\right)}^{10}\frac{k}{\mathrm{\ρD}}]}^{1/2}$

γ _s---the unit weight of sand grain;

The unit weight of γ---water body;

γ _b---the unit weight (considering that the space is interior) of bed surface silt;

γ _B0---bed surface silt reaches unit weight (=1.6 gram per centimeters after closely knit ³);

K---constant (=2.9 * 10 ^-4Gram per centimeter ³);

D---sand grain particle diameter;

ρ---water body density;

H---the depth of water.

Velocity flow profile: $\frac{U_{\max }-u}{U_{*}}=\frac{1}{k}\ln \frac{h}{y}$

The suspended load sand content distributes along vertical line: $\frac{S}{S_a}={\left[\frac{\frac{h}{y}-1}{\frac{h}{a}-1}\right]}^{\frac{\mathrm{\ω}}{{\mathrm{kU}}_{*}}}$

S _a---y equals the sand content at certain certain value a place;

U _*---drag velocity;

The heavy speed of ω---silt;

S/S _a---relative sand content;

Embodiment

In river width is 10～30 meters, and flood tide or ebb tide mean flow rate 0.5～1.5 meter per second in the river course, sediment grain size 0.03～0.1mm, depth of water 0.5m～3m.The initial velocity of sand grain is 0.01～0.25m/s.Rotor floatable sand device adopts two leaves or three blade rotors, 1 meter of the length of rotor, 0.5 meter of width, heavy 1kg.Being arranged at apart from the riverbed of rotor located Peak Flow Rate U about apart from 0.2m _MaxBe about 2.1m/s.

Claims (1)

1, rotor floatable sand device is characterized in that rotor floatable sand device is the rotor shape, the length 0.5-2 rice of rotor, and width 0.2-1 rice, rotor floatable sand device is lighter than water body density, is arranged at y=y|u=0.1-0.5U _MaxThe place, the y in the formula is apart from riverbed distance, U _MaxBe Peak Flow Rate, u is the arbitrfary point water velocity.

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