CN203487518U - Irrigating terminal having water measuring function - Google Patents

Abstract

The utility model relates to a water delivery structure in an irrigated area, particularly relates to an irrigating terminal having a water measuring function. The IPC (International Patent Classification) of the irrigating terminal having the water measuring function is E02B13/00. The irrigation cannel pipe system comprises a water delivery cannel pipe, water measuring short pipes, a front pressure measuring pipe, a rear pressure measuring pipe, a tailwater pond and a water gauge; the front end of the water measuring short pipe is provided with a socket to be connected with the water delivery cannel pipe; a pipe diameter reducing section with the reducing pipe diameter is arranged inside the water measuring short pipe; the front pressure measuring pipe is arranged inside the water measuring short pipe which is arranged before the pipe diameter reducing section; the rear pressure measuring pipe is arranged inside the water measuring short pipe which is arranged behind the pipe diameter reducing section; the rear ends of the water measuring short pipes are connected the tailwater pond; the elevation of an outlet of the tailwater pond is align to the tops of water-crossing sections of water outlets of the water measuring short pipes. Compared with the prior art, the irrigating terminal has the advantages of being low in cost, simple in structure, convenient to operate, capable of delivering water and directly measuring water flow inside the cannel pipes and being accurate in measuring.

Description

A kind of irrigation terminal with water gaging function

Technical field

The utility model relates to a kind of irrigated area conveyance structure, relates in particular to a kind of irrigation terminal with water gaging function, and its IPC international Patent classificating number is E02B13/00.

Background technology

In the field irrigation of yellow riffle area, often there is a large amount of small size irrigated areas, for the irrigated area of this small size, be applicable to adopting filling with and irrigate Dou pipe as irrigating terminal, directly from channel diversion irrigation.For Guan Gai Dou pipe, also there is no at present comparatively ideal water gaging means.Some irrigated areas adopt water meter, but water meter cost is higher, and safeguard inconvenient; The water loss carrying out between water gaging ， Dan Dou pipe and canal water gauging point in channel after another kind of alternative Shi Dou pipe cannot measure.Large channel or irrigated area, can utilize the supporting hydraulic structure on irrigation canal system, as water gagings such as lock, culvert, aqueduct, inverted-siphons, but for size, the much smaller Guan Gai Dou pipe of carrying capacity, current measuring structure, cost is relatively high, and form of structure is also inapplicable.Therefore, provide a kind of simple in structure, cost is low, be easy to safeguard, get final product water delivery, have again the irrigation terminal of water gaging function, is water conservancy irrigation field urgent problem.

Utility model content

The utility model is in order to overcome the deficiencies in the prior art, and a kind of cost providing is low, simple in structure, easy to operate, has the irrigation terminal of water gaging function simultaneously.The technical solution adopted in the utility model:

A kind of irrigation terminal with water gaging function, comprise defeated water Dou pipe, water gaging short tube, front piezometer tube, rear piezometer tube, afterbay and water gauge, described water gaging short tube front end is established bell and spigot and is connected with described Shu Shui Dou pipe, in described water gaging short tube, be provided with caliber change caliber section from large to small, described front piezometer tube is located in the water gaging short tube before described change caliber section, and described rear piezometer tube is located in described change caliber section water gaging short tube below; Described water gaging short tube rear end is connected with afterbay, and the elevation in described afterbay exit is concordant with the top of the water gaging short tube delivery port cross-section of river; Described water gauge is arranged on described afterbay sidewall; The cross section circular diameter that the cross section circular diameter d of described change caliber segment trailer is described change caliber section stem

doubly, front piezometer tube is 2d to the distance that becomes caliber section stem, and rear piezometer tube is 2cm to the distance that becomes caliber segment trailer, and the length that becomes caliber section is 2d.

Compared with prior art, the technical solution of the utility model, has following technique effect:

1, irrigation terminal structure of the present utility model is simple, ingenious, easy to operate, and cost is low;

2, this device both can water delivery, the directly water flow in Liang Ce Dou pipe

3, ingenious setting becomes caliber segment trailer and the proportionate relationship of stem cross section circular diameter and the position of front and back piezometer tube, and it is more accurate to make to measure.

4, make the elevation in afterbay exit concordant with the top of the water gaging short tube delivery port cross-section of river, make the current in afterbay more steady, the impact of minimizing on the short in-pipe flow of water gaging, equaled in a disguised form to extend the length of water gaging short tube water exit end, make the head reading of rear piezometer tube more accurate, stable, increased the accuracy of the measurement of water flow, made afterbay accomplish dual-use material.

Accompanying drawing explanation

Fig. 1 is the structural representation of irrigation terminal of the present utility model.

Fig. 2 is that the hydraulics of irrigation terminal of the present utility model calculates schematic diagram.

Wherein, piezometer tube, 7-afterbay after the defeated water Dou pipe of 1-, 2-water gaging short tube, 3-bell and spigot, 4-change caliber section, the front piezometer tube of 5-, 6-, 8-conveyance canal levee body, 9-water gauge, 1. section is the front piezometer tube place cross-section of river, and 2. section is the rear piezometer tube place cross-section of river.

The specific embodiment

Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.

Referring to Fig. 1, of the present utility model have water gaging function and irrigate terminal, comprises defeated water Dou pipe 1, water gaging short tube 2, front piezometer tube 5 and rear piezometer tube 6, afterbay 7 and water gauge 9.Described water gaging short tube 2 front ends are provided with bell and spigot 3, described Shu Shui Dou pipe 1 is connected with described water gaging short tube 2 by described bell and spigot 3, in described water gaging short tube 2, be provided with caliber change caliber section 4 from large to small, described front piezometer tube 5 is located in described change caliber section 4 water gaging short tube 2 above, and described rear piezometer tube 6 is located in described change caliber section 4 water gaging short tube 2 below.Described water gaging short tube 2 rear ends are connected with afterbay 7.Described water gauge 9 is arranged on described afterbay 7 sidewalls.

The elevation in described afterbay 7 exits is concordant with the top of the water gaging short tube 2 delivery port cross-sections of river, like this, make the current in afterbay more steady, the impact of minimizing on the current in water gaging short tube 2, equaled in a disguised form to extend the length of water gaging short tube 2 water exit ends, make the head reading of rear piezometer tube 6 more accurate, stable, increased the accuracy of the measurement of water flow, make afterbay 7 accomplish dual-use material.

Irrigation terminal of the present utility model, change caliber section 4 afterbody cross section diameter of a circle d are stem cross section circular diameter

doubly, front piezometer tube 5 is 2d to the distance that becomes caliber section 4 stems, and rear piezometer tube 6 is 2cm to the distance that becomes caliber section 4 afterbodys, and the length that becomes caliber section 4 is 2d.Adopting above-mentioned ratio and size setting, is that utility model people obtains by a large amount of engineering practices and correlation test.Like this, can greatly simplify and the corresponding Mathematical Modeling of structure on the one hand, improve the accuracy of measuring, on the other hand, also make the technical solution of the utility model when construction, have more operability.

Illustrate: " caliber " described in the utility model and " diameter " all refer to internal diameter.

Using method of the present utility model: referring to Fig. 1, when normal work, by front piezometer tube 5 and rear piezometer tube 6, measure respectively and become the forward and backward head of caliber section 4, calculate the head difference H that becomes caliber section 4 front and back, then set up calculated with mathematical model and go out the water flow in Dou pipe.

Because Guan Gai Dou guard system of the present utility model is worked under full packages state, change caliber section is forward and backward to be all submerged.The water flow computational methods of native system are as follows:

Referring to Fig. 2, by 1. section of front piezometer tube 5 place cross-section of river called afters, rear piezometer tube 6 place cross-section of river called afters are section 2..According to bernoulli equation, obtain:

${\mathrm{<figure-callout\; id="1"\; label="h"\; filenames="HSA0000094614400000012.png"\; state="\{\{state\}\}">h</figure-callout>}}_1+\frac{{\mathrm{\&alpha;}}_1{v}_1^2}{2g}=h_2+\frac{{\mathrm{\&alpha;}}_1{v}_2^2}{2g}+H_{\mathrm{loss}}$

In formula: h ₁--section piezometric head (the direct reading of front piezometer tube 5) 1., m;

H ₂--section piezometric head (the direct reading of rear piezometer tube 6) 2., m;

V ₁--section flow velocity 1., m/s;

V ₂--section flow velocity 2., m/s;

H _loss--1. section arrives section head loss 2., m;

α ₁--section kinetic energy correction factor 1.;

α ₂--section kinetic energy correction factor 2.;

The utility model can be got α ₁=α ₂=1.05=α, transposition is simplified to be had:

$h_1-h_2=\mathrm{\&alpha;}(\frac{v_2^2}{2g}-\frac{v_1^2}{2g})+H_{\mathrm{loss}}$ Formula (1)

? $\mathrm{\&Delta;H}=h_1-h_2=\mathrm{\&alpha;}(\frac{v_2^2}{2g}-\frac{{\mathrm{<figure-callout\; id="1"\; label="v"\; filenames="HSA0000094614400000012.png"\; state="\{\{state\}\}">v</figure-callout>}}_1^2}{2g})+H_{\mathrm{loss}}$ Formula (2)

According to the equation of continuity of current, to section 1. with section 2., have:

A ₁v ₁=A ₂v ₂formula (3)

In formula:

A ₁--section discharge area 1., m ²;

A ₂--section discharge area, aperture 2., m ²;

For Guan Gai Dou guard system of the present utility model, determine

therefore have

substitution formula (2), has:

$\mathrm{\&Delta;H}-H_{\mathrm{loss}}=\mathrm{\&alpha;}(\frac{v_2^2}{2g}-\frac{v_2^2}{2^2\&times;2g})$ Formula (4)

$v_2=\sqrt{\frac{8g}{3\mathrm{\&alpha;}}(\mathrm{\&Delta;H}-H_{\mathrm{loss}})}$

? $Q=A_2{v}_2={\mathrm{\&pi;r}}^2\&CenterDot;\sqrt{\frac{8g}{3\mathrm{\&alpha;}}(\mathrm{\&Delta;H}-H_{\mathrm{loss}})}=\frac{2\mathrm{\&pi;}}{3}{r}^2\sqrt{\frac{6g}{\mathrm{\&alpha;}}(\mathrm{\&Delta;H}-H_{\mathrm{loss}})}$ Formula (5)

In formula:

The flow of Q--Guan Gai Dou pipe, m ³/ s;

R--section aperture radius 2., m.

Flow through Dou pipe of application boundary shelf theory analysis becomes the head loss H of caliber section _loss.

Head loss H _losscomprise that 1. pressure measurement section arrives the intersegmental head loss Δ H of change caliber _a, the head loss Δ H of change caliber section _b, become caliber segment trailer outlet divergence loss Δ H _c, each loss is respectively calculated as follows:

1. head loss Δ H _a

Because turbulent boundary layer is fully developed in this section of current boundary layer, so C _fvalue is taken as constant: 0.00235.The formula that calculates this section of head loss by boundary layer theory is as follows:

${\mathrm{\&Delta;H}}_a=\frac{L_a{{\mathrm{<figure-callout\; id="1"\; label="v"\; filenames="HSA0000094614400000012.png"\; state="\{\{state\}\}">v</figure-callout>}}_1}^2}{R_1}\frac{C_F}{2g}$ Formula (6)

In formula: L _a--pressure measurement section is 1. to the length between transition section, m;

R ₁--pressure measurement section hydraulic radius 1., m.(full-section pipe-flow, hydraulic radius=area/wetted perimeter=r ₁/ 2)

R ₁--section aperture radius 1., m.

2. become the head loss Δ H of caliber section _b

Become caliber section current boundary layer also in turbulent condition, therefore C _fvalue is also taken as 0.00235.

Become caliber section head loss Δ H _bcalculating adopt average water head loss formula to calculate:

${\mathrm{\&Delta;H}}_b=\frac{0.00235L_b}{4g}(\frac{{\mathrm{<figure-callout\; id="1"\; label="v"\; filenames="HSA0000094614400000012.png"\; state="\{\{state\}\}">v</figure-callout>}}_1^2}{{\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="HSA0000094614400000012.png"\; state="\{\{state\}\}">R</figure-callout>}}_1}+\frac{v_2^2}{R_2})$ Formula (7)

In formula: L _b--become caliber section along the horizontal projection length of water (flow) direction, m;

V _b--become the current mean flow rate of caliber section entrance section, m/s;

_r2--section hydraulic radius 2., m.(full-section pipe-flow, R ₂=area/wetted perimeter=r/2)

3. become caliber segment trailer outlet divergence loss Δ H _c

While spreading, because kinetic energy is not converted into the head loss that potential energy causes completely, available equation below calculates:

Δ H _c=ξ (v ₂-v ₁) ²/ (2g) formula (8)

Wherein, ξ--energy-loss factor is the function of downstream diffuser gradient.Can be calculated by following formula the value of ξ:

$\mathrm{\&xi;}=\frac{1g\left(57.3\mathrm{\&pi;}\right)-0.165}{1.742}$ Formula (9)

H _loss=Δ H _a+ Δ H _b+ Δ H _c

The flow rate calculation process of Guan Gai Dou pipe:

Step 1: supposition head loss H _lossbe zero, by formula (5), calculate desirable flow; Step 2: by desirable flow substitution formula (6)-(8), calculate H _loss, and then substitution formula (5) calculates a flow; Step 3: compute repeatedly step 2, until the difference of two flows meets the requirement of computational accuracy.

Protection domain of the present utility model is not limited to above-mentioned example, and obviously, those skilled in the art can carry out various changes and distortion and not depart from scope and spirit of the present utility model the utility model.If these changes and distortion belong in the scope of the utility model claim and equivalent technologies thereof, intention of the present utility model also comprises these changes and is out of shape interior.

Claims (1)

1. an irrigation terminal with water gaging function, comprise Shu Shui Dou pipe (1), water gaging short tube (2), front piezometer tube (5), rear piezometer tube (6), afterbay (7) and water gauge (9), described water gaging short tube (2) front end is established bell and spigot (3) and is connected with described Shu Shui Dou pipe (1), in described water gaging short tube (2), be provided with caliber change caliber section (4) from large to small, described front piezometer tube (5) is located in described change caliber section (4) water gaging short tube (2) above, described rear piezometer tube (6) is located in described change caliber section (4) water gaging short tube (2) below, described water gaging short tube (2) rear end is connected with described afterbay (7), and the elevation in described afterbay (7) exit is concordant with the top of water gaging short tube (2) the delivery port cross-section of river, described water gauge (9) is arranged on the sidewall of described afterbay (7), the cross section circular diameter that the cross section circular diameter d of described change caliber section (4) afterbody is described change caliber section (4) stem

doubly, front piezometer tube (5) is 2d to the distance that becomes caliber section (4) stem, and rear piezometer tube (6) is 2cm to the distance that becomes caliber section (4) afterbody, and the length that becomes caliber section (4) is 2d.

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