CN2747565Y - Stoplog type self-circulation open ditch experiment trough - Google Patents

Abstract

The utility model discloses a stop log type self-circulation open ditch experiment trough, which provides with a self-circulation water supply oven; an underwater pump is arranged in the oven; a triangle weir water trough is arranged on the self-circulation water supply oven; a measure cylinder, a stilling water plat and a triangle weir are arrange in the triangle weir water trough; a stilling water hole is sideways opened at the stilling water plate; a measure needle of the measure water weir is arranged at the upper part of the measure cylinder; a voltage-stabilizing water tank is connected with the underwater pump by a pipeline of conveying water; an experiment water trough is arranged at the upper part of the triangle weir water trough; the head of the experiment water trough is connected with the voltage-stabilizing water tank, and the stern of the experiment water trough is provided with a stern door with a plurality of holes and a lower water channel; a plurality of mould mounting holes are arranged on the soleplate of the experiment water trough; the side wall of the experiment water trough body is provided with valve door troughs; a measure track is arranged at the upper part of the experiment water trough; a water channel measure needle of the experiment water trough is installed on the measure track. The triangle weir is attached with a water calliper of the triangle weir. The utility model solves the defects of the traditional open ditch experiment trough with broad occupying areas of infrastructure, high consumption, complex operation, low efficiency and indistinctive teaching effect.

Description

Stoplog type self-loopa open channel experimental tank

Technical field

The utility model relates to the experimental measurement instrument, relates in particular to a kind of stoplog type self-loopa open channel experimental tank.

Background technology

Water movement is a kind of very complicated spontaneous phenomenon, for the situation of motive power existence and the rule of their development, so far the fine grasp of also failing, hydraulic model test is copied the substance material object exactly, according to similar criterion, contraction becomes model, according to its suffered main acting force, research experiment.In the hydraulic model test,, need build and put the open channel experimental tank,, describe or shoot with video-corder various current phenomenons in the experimentation by means of open channel experimental tank observation flow-shape for cooperating whole hinge to arrange or studying some two-dimensional flow problem.

Therefore, the open channel experimental tank, is extensively used in engineering fluid mechanics and hydraulics of open channels course experiment teaching and relevant scientific research field thereof as an experiment porch.Yet traditional open channel experimental tank exists certain drawback: one, and the infrastructure construction engineering is huge, except that building experimental tank, also need build independent water supply, steady water, unwatering system, and the hundreds of easily thousands of square meters of floor area drop into huge; Its two, the huge equipment operation maintenance that brings thus of equipment is also complicated, operating cost is also higher; Its three, equipment is huge, and is comparatively independent between each facility, disperse, teaching efficiency is not directly perceived.

Summary of the invention

The purpose of this utility model provides a kind of stoplog type self-loopa open channel experimental tank.

It has the self-loopa supply tank, in the self-loopa supply tank, be provided with submersible pump, the triangular-notch weir flume is arranged on the self-loopa supply tank, be provided with in the triangular-notch weir flume and measure tube, water-stabilizing board and triangular-notch weir, water-stabilizing board's side direction has steady water hole, measure tube top and be provided with the weir chaining pin, being provided with submersible pump in water tank of voltage regulation and the self-loopa supply tank is connected with aqueduct, flow control valve is set on the aqueduct, the flow bypass valve, experimental trough is arranged on triangular-notch weir flume top, the experimental trough head is connected with water tank of voltage regulation, the experimental trough afterbody is provided with porous tail-gate and lower flume, the lower flume end opening enters the triangular-notch weir flume, and the experimental trough base plate is provided with a plurality of model mounting holes, and experimental trough groove body sidewall is provided with gate slot, experimental trough top arranges and measures track that the experimental trough chaining pin is placed in to be measured on the track.The used triangular-notch weir water gaging of triangular-notch weir slide calliper rule Ka Jiao is 90 °, is provided with on the slide calliper rule to eliminate the capillarity interior angle.

Advantage of the present utility model:

1) change the huge practice of structure in the past, equipment carries the self-circulation system of water supply, steady water, backwater, has removed huge capital construction from;

2) realize the simplification of dwindling of experimental system, and adopted stoplog type structure, a covering device to take up an area of and only count square meter, greatly saved the experimental arrangement place;

3) adopted independent self-loopa water system, water supply installation is common submersible pump, and power consumptive province, and recycling experiment water body economize on resources.

4) an equipment facility layout is closely reasonable, and each functional areas function is straight obviously to be seen, and miniaturization device is easy and simple to handle, is suitable for the modern teaching requirement;

Description of drawings

Fig. 1 is a stoplog type self-loopa open channel experimental tank structural representation.

Fig. 2 is triangular-notch weir water gaging slide calliper rule structural representations.

Fig. 3 is a triangular-notch weir water gaging slide calliper rule work synoptic diagram.

Embodiment

Stoplog type self-loopa open channel experimental tank has self-loopa supply tank 1, in the self-loopa supply tank, be provided with submersible pump 18, triangular-notch weir flume 2 is arranged on the self-loopa supply tank 1, be provided with in the triangular-notch weir flume 2 and measure tube 11, water-stabilizing board 12 and triangular-notch weir 13, water-stabilizing board's 12 side direction have steady water hole, measure tube 11 tops and be provided with weir chaining pin 14, being provided with submersible pump 18 usefulness aqueducts 19 in water tank of voltage regulation 3 and the self-loopa supply tank is connected, flow control valve 15 is set on the aqueduct 17, flow bypass valve 16, experimental trough 4 is arranged on triangular-notch weir flume 2 tops, experimental trough 4 heads are connected with water tank of voltage regulation 3, experimental trough 4 afterbodys are provided with porous tail-gate 9 and lower flume 10, lower flume 10 end openings enter triangular-notch weir flume 2, experimental trough 4 base plates are provided with a plurality of model mounting holes 8, experimental trough 4 groove body sidewalls are provided with gate slot 5, experimental trough 4 tops arrange and measure track 7 that experimental trough chaining pin 6 is placed in to be measured on the track 7.Set up triangular-notch weir water gaging slide calliper rule 19 on the triangular-notch weir 13 in the triangular-notch weir flume 2, triangular-notch weir water gaging slide calliper rule Ka Jiao is 90 °, is provided with on the slide calliper rule to eliminate the capillarity interior angle.

The course of work of the present utility model is: load the empirical model relevant with experimental project at experimental trough, test water submersible pump water lift in case in the self-loopa supply tank, after the water tank of voltage regulation voltage stabilizing, steadily enter experimental trough, walk around empirical model in the experimental trough, fall by the experimental trough afterbody and to enter the triangular-notch weir flume, measure overcurrent flow in the experimental trough by triangular-notch weir, water body again in the triangular-notch weir flume triangular-notch weir be back in the self-loopa supply tank.Use other measurement means, various current phenomenons in the experimentation are described or shot with video-corder to current through the empirical model fluidised form in the observation experiment tank.

Experimental principle

The utility model open channel experimental tank adopts the special triangular-notch weir in laboratory to measure flow, and its computing formula is:

Q＝15.42(□h) ^2.47(cm ³/s) (1)

□h＝ ₀₁- ₀₀(cm) (2)

In the formula:

Q---triangular-notch weir overcurrent flow;

₀₁, ₀₀---be respectively triangular-notch weir weir crest water level and triangular-notch weir weir crest elevation.

Current enter experimental trough through water tank of voltage regulation, and the back is by triangular-notch weir, and the centre no longer includes flow input, output, so experiment records triangular-notch weir overcurrent flow Q, and the water flow of model by experiment in the experimental trough of just can attaining the Way.If will given flow Q in the experimental trough be obtained by (1), (2)

${\▿}_{01}=\sqrt[2.47]{Q/15.42}+{\▿}_{00}$

By regulating flow control valve, flow bypass valve opening, make triangular-notch weir weir crest water level ₀₁Reach calculated value, just can obtain given flow Q.

Triangular-notch weir water gaging slide calliper rule of the present utility model are specifically designed to measures triangular-notch weir weir crest elevation ₀₀, because there are capillarity in water and weir wall, local liquid level raises, and invents this novel triangular-notch weir water gaging slide calliper rule, interior angle is set on the slide calliper rule is used to eliminate capillarity.Measure triangular-notch weir weir crest elevation ₀₀Method is: slide calliper rule are adjacent to the triangular-notch weir wall place the triangle weir crest, slide calliper rule pinnacle and triangular-notch weir weir crest are in same elevation, by measuring tube to the water filling of triangular-notch weir flume, water level rises in the triangular-notch weir flume, when water level just in time reaches the slide calliper rule pinnacle, record slide calliper rule pinnacle elevation by the weir chaining pin and be triangular-notch weir weir crest elevation ₀₀

Experiment content

The utility model open channel experimental tank in engineering fluid mechanics and hydraulics of open channels course experiment teaching and relevant scientific research field thereof, as cooperates whole hinge to arrange, study some two-dimensional flow problem etc. as an experiment porch, all can use.Often implementing experimental project has:

1) fluidised form experiment

In the open channel of gate downstream a barrier is set, regulating gate aperture, tail-gate drop to lowest part, start water pump, regulate flow Q lock downstream current and present the torrent state, its Fr＞1.Under the torrent, current can not upstream be propagated by the formed interference microwave of disturbance, and when current were flowed through barrier, the protuberance phenomenon appearred in the water surface.Suitably the rising tail-gate makes and forms submerge discharging flow under the lock.Current present the unhurried current state, and at this moment its Fr＜1 disturbs microwave energy upstream to propagate, when current are flowed through barrier, and drop in water surface.This flowing is called unhurried current.

2) weir flow experiment

Be provided with special mounting hole in the utility model open channel experimental tank experimental trough, be used to install different weirs type, as sharp-crested weir, practical weir, WES weir etc., no bank broad-crested weir, above-mentioned weir type is installed respectively, can carry out the weir flow experiment of different weirs type, measure different weir type coefficient of flow m, its computing formula is:

$Q=\mathrm{mb}\sqrt{2g}{H}_0^{3/2}---({\mathrm{<figure-callout\; id="3"\; label="cm"\; filenames="Y20042008166400071.png"\; state="\{\{state\}\}">cm</figure-callout>}}^3/s)$

In the formula:

Q---overcurrent flow on the weir, the utility model is recorded by the triangle weir, sees formula (1), (2);

B---experimental trough width;

H ₀---gross head on the weir, $H_0=H+\frac{{\mathrm{\&alpha;\&upsi;}}^2}{2g};$

H---weir head.

In addition, the utility model carries the triangular-notch weir measurement of discharge, but the experiment of double as triangle sharp-crested weir.

3) hydraulic jump experiment

Can measure complete hydraulic jump conjugate depth h ', h by experiment ", long L jumps _B, energy dissipation rate η, and can verify the theoretical formula that free hydraulic jump is calculated in the flat slope rectangular channel:

$h^{\&prime;}=\frac{h^{\&prime;\&prime;}}{2}\left(\sqrt{1+8\frac{{\mathrm{\&alpha;<figure-callout\; id="2"\; label="q"\; filenames="Y20042008166400071.png"\; state="\{\{state\}\}">q</figure-callout>}}^2}{{\mathrm{gh}}^{\&prime;\&prime;3}}-1}\right)$

L _B＝6.1h″

${\mathrm{\&Delta;H}}_j=\frac{{(h^{\&prime;\&prime;}-h^{\&prime;})}^3}{4h^{\&prime;\&prime;}{h}^{\&prime;}}$

η＝ΔH _j/H ₁

In the formula,

The energy loss of Δ Hj---hydraulic jump;

H ₁---section total head before jumping.

Also can demonstrate far simultaneously drive, critical with flood three kinds of hydraulic jumps and and chopping jump, weak hydraulic jump, the oscillating jump distinguished different, stablize hydraulic jump and five kinds of kenel hydraulic jumps of strong hydraulic jump by Fr.

1) energy dissipating experiment

Be provided with special mounting hole in the utility model open channel experimental tank experimental trough, cooperate special bed hedgehopping formula energy dissipating experiment porch, by the engineering prototype data that is provided, carry out the energy dissipating experiment according to requirement of experiment, check is provided with the necessity of energy dissipating.And the rationality of check prototype energy dissipating waterpower design.Experimental project has: the experiment of disspation through hydraudic jimp pond, the experiment of disspation through hydraudic jimp bank, flip trajectory bucket, submerged bucket dissipator, bucket typed stilling etc.

2) other two-dimensional flow problem experiment

The utility model open channel experimental tank is as an experiment porch, except that can carrying out above-mentioned several experiments, also can carry out at engineering fluid mechanics and hydraulics of open channels course experiment teaching and relevant some other experimental studies of scientific research field thereof, start flow velocity experiment etc. as silt particle.

Claims (2)

1, a kind of stoplog type self-loopa open channel experimental tank, it is characterized in that it has self-loopa supply tank (1), in the self-loopa supply tank, be provided with submersible pump (18), triangular-notch weir flume (2) is arranged on the self-loopa supply tank (1), be provided with in the triangular-notch weir flume (2) and measure tube (11), water-stabilizing board (12) and triangular-notch weir (13), water-stabilizing board (12) side direction has steady water hole, measure tube (11) top and be provided with weir chaining pin (14), the submersible pump of establishing in water tank of voltage regulation (3) and the self-loopa supply tank (18) is connected with aqueduct (17), flow control valve (15) is set on the aqueduct (17), flow bypass valve (16), experimental trough (4) is arranged on triangular-notch weir flume (2) top, experimental trough (4) head is connected with water tank of voltage regulation (3), experimental trough (4) afterbody is provided with porous tail-gate (9) and lower flume (10), lower flume (10) end opening enters triangular-notch weir flume (2), experimental trough (4) base plate is provided with a plurality of model mounting holes (8), experimental trough (4) groove body sidewall is provided with gate slot (5), experimental trough (4) top arranges and measures track (7) that experimental trough chaining pin (6) is placed in to be measured on the track (7).

2, according to the described a kind of stoplog type self-loopa open channel experimental tank of claim 1, it is characterized in that, set up triangular-notch weir water gaging slide calliper rule (19) on the triangular-notch weir (13) in the triangular-notch weir flume (2), triangular-notch weir water gaging slide calliper rule Ka Jiao is 90 °, is provided with on the slide calliper rule to eliminate the capillarity interior angle.

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