CN103774747B - Telescoping venturi siphoning blowdown pipe and design method - Google Patents
Telescoping venturi siphoning blowdown pipe and design method Download PDFInfo
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- CN103774747B CN103774747B CN201310736135.XA CN201310736135A CN103774747B CN 103774747 B CN103774747 B CN 103774747B CN 201310736135 A CN201310736135 A CN 201310736135A CN 103774747 B CN103774747 B CN 103774747B
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Abstract
The invention discloses a telescoping venturi siphoning blowdown pipe and a design method. The telescoping venturi siphoning blowdown pipe is characterized by comprising a siphon, an air communicating valve, a jet pipe and a water supplement valve, wherein the water inlet end and a drain outlet of the siphon are immersed below the water level of a water collecting tank and the water level of blowdown well, the highest point portion of the siphon is connected with the air communicating valve in a sealed mode, and a reducing section is arranged at the top of the drain outlet; a reducing head is arranged at one end of the jet pipe, the reducing head and the jet pipe are fixedly connected into a whole, the other end of the jet pipe is connected with a first circulating water return pipe in a sealed mode through the water supplement valve, and the jet pipe extends into the siphon. The design method comprises the following steps of calculating the flow velocity of circulating water return branch pipes, calculating the flow velocity of the jet pipe, calculating the pressure head converted from the flow velocity of the reducing section of the jet pipe, calculating the flow velocity of the siphon, and calculating the maximum allowable superelevation of the siphon. The telescoping venturi siphoning blowdown pipe and the design method have the advantages that the structure is simple, the cost is low, opening and closing are convenient, control is easy, the effect is remarkable, and the telescoping venturi siphoning blowdown pipe and the design method can be applicable to the occasion that sewage on the water surface needs to be discharged, and the requirements that the water outlet end and the drain outlet are immersed below the water level, and a supplement water source needed by the jet pipe is arranged are met.
Description
Technical field
The present invention relates to chemical industry equipment, is a kind of bushing type venturi siphon blowing pipe for discharging collecting-tank water surface dirt and method for designing.
Background technology
Reclaimed water system has one deck foundry loam to float on the collecting-tank water surface after sterilizing peel-off, this part foundry loam is as discharged displacement not in time, reclaimed water system can be got back to again, reduce bactericidal effect, common Circulating water effluent point is all bottom collecting-tank, therefore, displace this part dirt and will arrange benefit clear water in a large number, cause the waste of water.
The circulating water sterilizing blowdown of prior art has four kinds of forms:
1, in collecting-tank, add bleed off pipe and bottom collecting-tank, pay blowdown separately, do not add valve.Problems existing is: the bleed off pipe be arranged on 1), separately in collecting-tank can only be arranged when collecting-tank interior construction, cannot transform when reclaimed water system is run; 2), owing to there is no valve, at collecting-tank water level higher than meeting Auto-drainage during overfall, wayward water discharge time;
2, in collecting-tank, add bleed off pipe and be connected with bottom blow-down pipe.Problems existing is 1), the bleed off pipe be arranged in collecting-tank can only arrange when collecting-tank interior construction, cannot transform when reclaimed water system is run; 2), because raw sewage disposal tube valve is at collecting-tank outlet at bottom and caliber is comparatively large, controlled valve is cumbersome;
3, punch on collecting-tank pool wall, increase overfall, do not add valve.Problems existing is: 1) transform difficulty comparatively large, need to construct on cement pool wall, thus destroys pool wall original structure and anticorrosion; 2) owing to there is no valve, at collecting-tank water level higher than meeting Auto-drainage during overfall, wayward water discharge time;
4, punch on collecting-tank pool wall, increase overfall, add valve.Problems existing is: 1) transform difficulty comparatively large, need to construct on cement pool wall, thus destroys pool wall original structure and anticorrosion; 2), the larger controlled valve of valve caliber is cumbersome;
5, bleed off pipe is not added, directly at bottom blow-down.Problems existing is: 1) after sterilizing peel-off, foam cannot be discharged in time, and labor cleaning's intensity is large, as labor cleaning can cause change of water quality to fluctuate not in time; 2), after sterilizing peel-off blowing time is long, and displacement is large, waste moisturizing.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming overcoming prior art, there is provided that a kind of structure is simple, with low cost, switch be convenient, the bushing type venturi siphon blowing pipe of Be very effective and method for designing, can directly discharge the dirt floated on the surface, reduce the rate of water make-up after sterilizing peel-off and prevent dirt secondary cycle from entering system.
The scheme of technical solution problem of the present invention is: a kind of bushing type venturi siphon blowing pipe, it is characterized in that: it comprises syphon, air communication valve, playpipe and water compensating valve, described syphon is sinuous coil, siphonal water intake end be immerse the horn mouth of below the collecting-tank water surface, outfall immerses below the water surface of sewage well, to be tightly connected air communication valve at siphonal peak, reducer is set above siphonal outfall; Described playpipe one end is provided with the reducing head, the other end that are fixed with one and is tightly connected by water compensating valve and recirculated water first group of return branch, playpipe stretches in syphon between siphonal peak and reducer, the reducing head of playpipe is positioned at the top of siphonal reducer, and the tube wall of playpipe and syphon are tightly connected.
A method for designing for bushing type venturi siphon blowing pipe, is characterized in that: it comprises the following steps:
1) set recirculated water first group of return branch, recirculated water second group of return branch flow velocity, carry out iterative computation
The flow velocity of setting recirculated water first group of return branch
and the flow velocity of recirculated water second group of return branch
, the Reynolds number of recirculated water first group of return branch is calculated according to formula (1)
with the Reynolds number of recirculated water second group of return branch
(1)
In formula:
-Reynolds number;
-pipe flow speed (m/s), setting in formula (1);
-pipe diameter (m);
the motion coefficient of viscosity of-medium, the motion coefficient of viscosity of water is 1.31*10
-6(m
2/ s);
2) computation cycles water return branch flow velocity
A) according to the pipeline relative roughness of formula (2) computation cycles water first group of return branch and recirculated water second group of return branch:
Relative roughness
(2)
In formula:
-pipeline roughness height, can table look-up according to pipe material and draw;
-pipe diameter (mm);
B) according to the pipeline impedance of formula (3) computation cycles water first group of return branch
with the pipeline impedance of recirculated water second group of return branch
(3)
In formula:
the impedance of-pipeline;
-pipeline frictional resistant coefficient, the Reynolds number that the relative roughness calculated according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
-pipeline total length (m);
-pipe diameter (m);
-coefficient of partial resistance sum;
-coefficient of partial resistance;
-pi;
-acceleration of gravity 9.8m/s
2;
C) recirculated water return branch connects collecting-tank and recirculated water return main, and two groups of recirculated water return branch that two collecting-tanks have are parallel pipeline, and the pipeline flow between parallel pipeline and pipeline impedance have the relation of formula (4):
(4)
In formula:
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
（5）
In formula:
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the number of tubes of-recirculated water first group of return branch;
the number of tubes of-recirculated water second group of return branch;
E) flow of computation cycles water return branch
Formula (4) is substituted into formula (5):
(6)
In formula:
the pipeline flow of-recirculated water return main;
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the number of tubes of-recirculated water first group of return branch;
the number of tubes of-recirculated water second group of return branch;
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
The flow of recirculated water first group of return branch is calculated by formula (6)
;
Formula (4) is substituted into formula (5):
(7)
The same formula of symbol definition in formula (6)
The flow of recirculated water second group of return branch is calculated by formula (7)
;
F) flow velocity of computation cycles water return branch
The flow velocity of formula (8) computation cycles water first group of return branch is calculated according to pipe flow speed
with the flow velocity of recirculated water second group of return branch
:
(8)
In formula:
-pipe flow speed (m/s);
-pipeline flow (m
3/ s); Calculated by formula (6) or formula (7) and try to achieve,
-pipeline section amasss (m
2);
The flow velocity of the recirculated water first group of return branch calculated by formula (8)
with the flow velocity of recirculated water second group of return branch
Result close with setting value, result of calculation is reliable, otherwise, should reset
with
, and recalculate from step 1)
with until result of calculation is close with setting value;
3) flow velocity of playpipe is calculated
Setting playpipe flow velocity
, by step 1) and step 2) and calculate the flow velocity of playpipe
, result of calculation is close with setting value, and result of calculation is reliable, otherwise, should reset
, and recalculate from step 1)
until result of calculation is close with setting value;
4) pressure head that playpipe reducing place flow velocity is changed is calculated
A) according to jet orifice flow velocity after formula (9) calculating reducing
（9）
In formula:
---playpipe flow velocity (m/s) before reducing;
---jet orifice flow velocity (m/s) after reducing;
---jet segment sectional area (m after reducing
2);
---playpipe sectional area (m before reducing
2);
B) according to the pressure head that formula (10) calculating Venturi tube kinetic energy is changed
Δh=
2/2g （10）
In formula:
---the pressure head (m) that Venturi tube kinetic energy is changed;
---jet orifice flow velocity (m/s) after reducing, calculates according to formula (9) and tries to achieve;
-acceleration of gravity 9.8m/s
2;
5) the maximum permission superelevation of syphon calculates
A) syphon flow velocity is set
, calculate siphonal Reynolds number by the formula (1) of step 1)
, calculate siphonal relative roughness by formula (2), according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined
;
B) syphon flow velocity is calculated according to formula (11)
:
（11）
In formula:
---syphon flow velocity; (m/s);
the difference in height (m) of-syphon waste place's liquid level and entrance liquid level;
-acceleration of gravity 9.8m/s
2;
-syphon frictional resistant coefficient, according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined;
-siphon piping total length (m);
-syphon diameter (m);
-coefficient of partial resistance sum, namely syphon entrance is to exporting all coefficient of partial resistance sums;
Syphon flow velocity
result of calculation close with setting value, result of calculation is reliable, otherwise, should reset
, and recalculate siphonal Reynolds number and siphonal relative roughness, until
result of calculation close with setting value;
C) the maximum permission superelevation of syphon is calculated according to formula (12):
（12）
In formula:
maximum permission superelevation (m) of-syphon, the potential difference namely between syphon entrance liquid level and syphon peak;
maximum permission vacuum height (m) in-pipe top;
-syphon frictional resistant coefficient, the Reynolds number that the relative roughness calculated according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
-siphon piping total length (m);
-syphon diameter (m);
2-coefficient of partial resistance sum, namely syphon entrance is to all coefficient of partial resistance sums of peak;
-syphon flow velocity; (m/s), try to achieve according to formula (11) calculating;
-acceleration of gravity 9.8m/s
2.
Bushing type venturi siphon blowing pipe of the present invention and method for designing, increase and pressure energy reduction at the flow velocity after reducing head of the circulating water flow in playpipe, thus produce negative pressure in the both sides of playpipe and start the air inhaled in syphon, same venturi principle, because the horn mouth of syphon water intake end and delivery port are all immersed in the water of below collecting-tank water level and sewage well water level, therefore, automatic generation siphon drainage after the air in syphon blots, now can close the communicating valve of playpipe and recirculated water first group of return branch, siphon can not stop; When needing to stop siphon, make air enter syphon, the horn mouth of syphon water intake end increases the area of water inlet, is beneficial to floating pollutant on the water surface and enters syphon.During use, the horn mouth of syphon water intake end and outfall is made to immerse in the water of below collecting-tank water level and sewage well water level respectively, the water compensating valve opening playpipe injects recirculated water in playpipe, while recirculated water in playpipe flows into sewage well, also the air in emptying syphon, thus automatically generate siphon drainage, close water compensating valve afterwards.When needing to stop siphon, open the air communication valve of syphon peak, automatically can stop siphon because air enters, or make the horn mouth of syphon water intake end exceed more than collecting-tank water level, also can stop siphon.Have that structure is simple, with low cost, switch be convenient, control freely, the advantage of Be very effective.
Accompanying drawing explanation
Fig. 1 is the siphon blowing pipe structural representation of bushing type venturi siphon blowing pipe of the present invention and method for designing;
Fig. 2 is the close-up schematic view of Fig. 1
Fig. 3 is that schematic diagram is moved towards in the recirculated water siphon blowdown of bushing type venturi siphon blowing pipe of the present invention and method for designing;
Fig. 4 is the circulation water station schematic diagram having bushing type venturi siphon blowing pipe;
Fig. 5 is the structural representation of embodiment.
In figure: 1 collecting-tank water level, 2 horn mouths, 3 syphons, 4 air communication valves, 5 playpipes, 6 sewage well water levels, 7 outfall, 8 reducers, 9 reducing heads, 10 water compensating valves, 11 recirculated water first group return branch, 12 recirculated water second group return branch, 13 recirculated water return mains, 14 recirculated water collecting-tanks.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
With reference to Fig. 1 ~ Fig. 5, bushing type venturi siphon blowing pipe of the present invention and method for designing, it comprises syphon 3, air communication valve 4, playpipe 5 and water compensating valve 10, described syphon 3 is sinuous coil, the water intake end of syphon 3 be immerse the horn mouth 2 of collecting-tank water level less than 1, water level less than 7 that outfall 7 immerses sewage well, to be tightly connected air communication valve 4 at the peak of syphon 3, reducer 8 is set above the outfall 7 of syphon 3; Described playpipe 5 one end is provided with the reducing head 9, the other end that are fixed with one and is tightly connected by water compensating valve 10 and recirculated water first group of return branch 11, playpipe 5 stretches in syphon 3 between the peak and reducer 8 of syphon 3, the reducing head 9 of playpipe 5 is positioned at the top of the reducer 8 of syphon 3, and the tube wall of playpipe 5 and syphon 3 are tightly connected.Described air communication valve 4 and water compensating valve 10 are the commercially available prod of prior art.The bushing type venturi siphon blowing pipe of the present embodiment is arranged on the collecting-tank of circulation water station first phase, and playpipe and recirculated water first group of return branch of bushing type venturi siphon blowing pipe are tightly connected.
The bushing type venturi siphon blowing pipe method for designing of the present embodiment comprises the following steps:
1) set recirculated water first group of return branch, recirculated water second group of return branch flow velocity, carry out iterative computation
The flow velocity of setting recirculated water first group of return branch
and the flow velocity of recirculated water second group of return branch
, the Reynolds number of recirculated water first group of return branch is calculated according to formula (1)
with the Reynolds number of recirculated water second group of return branch
(1)
In formula:
-Reynolds number;
-pipe flow speed (m/s), setting in formula (1);
-pipe diameter (m);
the motion coefficient of viscosity of-medium, the motion coefficient of viscosity of water is 1.31*10
-6(m
2/ s);
=824427
=1236641
2) computation cycles water return branch flow velocity
A) according to the pipeline relative roughness of formula (2) computation cycles water first group of return branch and recirculated water second group of return branch:
Relative roughness
(2)
In formula:
-pipeline roughness height, can table look-up according to pipe material and draw; The present embodiment is carbon steel tube, and pipeline roughness height is 0.046mm;
-pipe diameter (mm), the present embodiment is DN600mm, DN900mm;
Recirculated water first group of return branch relative roughness
=0.000077
Recirculated water second group of return branch relative roughness
=0.000051
Look into Moody chart to obtain
=0.012,
=0.011
B) according to the pipeline impedance of formula (3) computation cycles water first group of return branch
with the pipeline impedance of recirculated water second group of return branch
(3)
In formula:
the impedance of-pipeline;
-pipeline frictional resistant coefficient, the Reynolds number that the relative roughness calculated according to formula (2) and formula (1) calculate is looked into Moody chart and is determined; Look into Moody chart to obtain
=0.012,
=0.011
-pipeline total length (m); The present embodiment recirculated water first group of return branch, recirculated water second group of return branch are 10m;
-pipe diameter (m); The present embodiment recirculated water first group of return branch is 0.9m, recirculated water second group of return branch 0.6m;
-coefficient of partial resistance sum; The present embodiment comprise all elbows, valve, import and export coefficient of partial resistance and, the present embodiment numerical value is 2;
-coefficient of partial resistance;
-pi;
-acceleration of gravity 9.8m/s
2;
Calculating is tried to achieve
=0.51748;
=1.18553;
C) recirculated water return branch connects collecting-tank and recirculated water return main, and two groups of recirculated water return branch that two collecting-tanks have are parallel pipeline, and the pipeline flow between parallel pipeline and pipeline impedance have the relation of formula (4):
(4)
In formula:
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
（5）
In formula:
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the number of tubes of-recirculated water first group of return branch; The present embodiment is 4;
the number of tubes of-recirculated water second group of return branch; The present embodiment is 3;
E) flow of computation cycles water return branch
Formula (4) is substituted into formula (5):
(6)
In formula:
the pipeline flow of-recirculated water return main; The present embodiment is 5.556 m
3/ s,
pipeline flow (the m of-recirculated water first group of return branch
3/ s);
pipeline flow (the m of-recirculated water second group of return branch
3/ s);
the number of tubes of-recirculated water first group of return branch; The present embodiment is 4;
the number of tubes of-recirculated water second group of return branch; The present embodiment is 3;
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
The flow of recirculated water first group of return branch is calculated by formula (6)
, the flow of the present embodiment recirculated water first group of return branch
for 0.5108m
3/ s;
Formula (4) is substituted into formula (5):
(7)
The same formula of symbol definition in formula (6)
The flow of recirculated water second group of return branch is calculated by formula (7)
=1.1706m
3/ s;
F) flow velocity of computation cycles water return branch
The flow velocity of formula (8) computation cycles water first group of return branch is calculated according to pipe flow speed
with the flow velocity of recirculated water second group of return branch
;
(8)
In formula:
-pipe flow speed (m/s);
-pipeline flow (m
3/ s);
-pipeline section amasss (m
2);
The flow velocity of recirculated water first group of return branch is calculated by formula (8)
=1.81m/s, the flow velocity of the present embodiment recirculated water second group of return branch
=1.84m/s,
,
close with setting value, result of calculation is reliable;
3) flow velocity of playpipe is calculated
The playpipe diameter 0.05m of the present embodiment, pipe range 5, local resistance summation is 0.5, is arranged on circulation water station first phase and is connected with recirculated water first group of return branch:
Setting playpipe flow velocity
=2m/s, calculates playpipe Reynolds number by the formula (1) of step 1)
=76336, the relative roughness being calculated playpipe by formula (2) is 0.000092, looks into Moody chart and obtains playpipe frictional resistant coefficient
=0.012, can be obtained by formula (6)
=0.004m
3/ s, is obtained by formula (8)
=2.04m/s, close with setting value, result of calculation is reliable;
4) pressure head that playpipe reducing place flow velocity is changed is calculated
A) according to jet orifice flow velocity after formula (9) calculating reducing
（9）
In formula:
---playpipe flow velocity (m/s) before reducing; The present embodiment is 2.04m/s;
---jet orifice flow velocity (m/s) after reducing;
---jet segment sectional area (m after reducing
2); The present embodiment is 0.000490625m
2;
---playpipe sectional area (m before reducing
2); The present embodiment is 0.0019625m
2;
Calculating is tried to achieve
=8.12m/s;
B) according to the pressure head that formula (10) calculating Venturi tube kinetic energy is changed
Δh=
2/2g=3.364m （10）
In formula:
---the pressure head (m) that Venturi tube kinetic energy is changed;
---jet orifice flow velocity (m/s) after reducing, trying to achieve the present embodiment according to formula (9) calculating is 8.12m/s;
-acceleration of gravity 9.8m/s
2;
5) the maximum permission superelevation of syphon calculates
A) syphon flow velocity is set
, calculate siphonal Reynolds number by the formula (1) of step 1)
, calculate siphonal relative roughness by formula (2), according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined
be 0.017;
B) syphon flow velocity is calculated according to formula (11):
=1.1832 m/s （11）
In formula:
---syphon flow velocity; (m/s);
the difference in height (m) of-syphon waste place's liquid level and entrance liquid level; The present embodiment is 3m;
-acceleration of gravity 9.8m/s
2;
-syphon frictional resistant coefficient, according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined; Looking into Moody chart, can to obtain the present embodiment friction loss be 0.017;
-siphon piping total length (m); The present embodiment is 10m;
-syphon diameter (m); The present embodiment is DN100mm, 0.1m;
-coefficient of partial resistance sum, namely syphon entrance is to exporting all local resistance sums; The present embodiment is 2.5;
=1.1832 m/s, result of calculation is close with setting value, and result of calculation is reliable;
C) the maximum permission superelevation of syphon is calculated according to formula (12):
=6.71111 （12）
In formula:
maximum permission superelevation (m) of-syphon, the potential difference namely between syphon entrance liquid level and syphon peak;
maximum permission vacuum height (m) in-pipe top, generally gets 7m in theory;
-syphon frictional resistant coefficient, according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined; Tabling look-up and can obtaining the present embodiment friction loss is 0.017;
-siphon piping total length (m); The present embodiment is 10m;
-syphon diameter (m); The present embodiment is DN100mm, 0.1m;
2-coefficient of partial resistance sum, namely syphon entrance is to all local resistance sums of peak; The present embodiment is 1.5;
-syphon flow velocity; (m/s), try to achieve according to formula (11) calculating; The present embodiment is 1.1832 m/s;
-acceleration of gravity 9.8m/s
2.
6), in actual installation process, syphon is installed and will be met the following conditions:
A) syphon peak and entrance liquid level difference are less than hs; (example is 0.65m, much smaller than 6.71m);
B) outlet of venturi jet segment is less than Δ h with syphon peak liquid level difference; (example is 1.55m, is less than 3.364m).
The bushing type venturi siphon blowing pipe of the present embodiment and method for designing, because syphon 3 water inlet and delivery port are all immersed in the water of collecting-tank water level 1 and sewage well water level less than 6, therefore, automatic generation siphon drainage after the air in syphon 3 blots, now can close the communicating valve of playpipe 5 and recirculated water first group of return branch 11, siphon can not stop; When needing to stop siphon, make air enter syphon 3, the horn mouth 2 of syphon 3 water intake end increases the area of water inlet, is beneficial to floating pollutant on the water surface and enters syphon 3.During use, the horn mouth 2 of syphon 3 water intake end and outfall 7 are immersed in the water of collecting-tank water level 1 and sewage well water level less than 6 respectively, the water compensating valve 10 opening playpipe 5 injects recirculated water in playpipe 5, while recirculated water in playpipe 5 flows into sewage well, also the air in emptying syphon 3, thus automatically generate siphon drainage, close water compensating valve 10 afterwards.When needing to stop siphon, open the air communication valve 4 of syphon 3 peak, automatically can stop siphon because air enters, or make the horn mouth 2 of syphon 3 water intake end exceed collecting-tank water level 1, also can stop siphon.Have that structure is simple, with low cost, switch be convenient, control freely, the advantage of Be very effective.
The present invention, not only for the discharge of collecting-tank water surface dirt after reclaimed water system sterilizing peel-off, is also applicable to and needs to discharge water surface dirt and possess the occasion that water side and outfall all immerse make-up water source needed for below water level and playpipe.
Claims (2)
1. a bushing type venturi siphon blowing pipe, it is characterized in that: it comprises syphon, air communication valve, playpipe and water compensating valve, described syphon is sinuous coil, siphonal water intake end be immerse the horn mouth of below the collecting-tank water surface, outfall immerses below the water surface of sewage well, to be tightly connected air communication valve at siphonal peak, reducer is set above siphonal outfall; Described playpipe one end is provided with the reducing head, the other end that are fixed with one and is tightly connected by water compensating valve and recirculated water first group of return pipe, playpipe stretches in syphon between siphonal peak and reducer, the reducing head of playpipe is positioned at the top of siphonal reducer, and the tube wall of playpipe and syphon are tightly connected.
2. the method for designing of bushing type venturi siphon blowing pipe as claimed in claim 1, is characterized in that: it comprises the following steps:
1) set recirculated water first group of return branch, recirculated water second group of return branch flow velocity, carry out iterative computation
The flow velocity of setting recirculated water first group of return branch
and the flow velocity of recirculated water second group of return branch
, the Reynolds number of recirculated water first group of return branch is calculated according to formula (1)
with the Reynolds number of recirculated water second group of return branch
(1)
In formula:
-Reynolds number;
-pipe flow speed m/s, setting in formula (1);
-pipe diameter m;
the motion coefficient of viscosity of-medium, the motion coefficient of viscosity of water is 1.31*10
-6(m
2/ s);
2) computation cycles water return branch flow velocity
A) according to the pipeline relative roughness of formula (2) computation cycles water first group of return branch and recirculated water second group of return branch:
Relative roughness
(2)
In formula:
-pipeline roughness height, can table look-up according to pipe material and draw;
-pipe diameter (mm);
B) according to the pipeline impedance of formula (3) computation cycles water first group of return branch
with the pipeline impedance of recirculated water second group of return branch
(3)
In formula:
the impedance of-pipeline;
-pipeline frictional resistant coefficient, the Reynolds number that the relative roughness calculated according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
-pipeline total length m;
-pipe diameter m;
-coefficient of partial resistance sum;
-coefficient of partial resistance;
-pi;
-acceleration of gravity 9.8m/s
2;
C) recirculated water return branch connects collecting-tank and recirculated water return main, and two groups of recirculated water return branch that two collecting-tanks have are parallel pipeline, and the pipeline flow between parallel pipeline and pipeline impedance have the relation of formula (4):
(4)
In formula:
the pipeline flow m of-recirculated water first group of return branch
3/ s;
the pipeline flow m of-recirculated water second group of return branch
3/ s;
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
（5）
In formula:
the pipeline flow m of-recirculated water first group of return branch
3/ s;
the pipeline flow m of-recirculated water second group of return branch
3/ s;
the number of tubes of-recirculated water first group of return branch;
the number of tubes of-recirculated water second group of return branch;
E) flow of computation cycles water return branch
Formula (4) is substituted into formula (5):
(6)
In formula:
the pipeline flow of-recirculated water return main;
the pipeline flow m of-recirculated water first group of return branch
3/ s;
the pipeline flow m of-recirculated water second group of return branch
3/ s;
the number of tubes of-recirculated water first group of return branch;
the number of tubes of-recirculated water second group of return branch;
the pipeline impedance of-recirculated water first group of return branch, calculates according to formula (3) and tries to achieve;
the pipeline impedance of-recirculated water second group of return branch, calculates according to formula (3) and tries to achieve;
The flow of recirculated water first group of return branch is calculated by formula (6)
;
Formula (4) is substituted into formula (5):
(7)
The same formula of symbol definition in formula (6)
The flow of recirculated water second group of return branch is calculated by formula (7)
;
F) flow velocity of computation cycles water return branch
The flow velocity of formula (8) computation cycles water first group of return branch is calculated according to pipe flow speed
with the flow velocity of recirculated water second group of return branch
:
(8)
In formula:
-pipe flow speed m/s;
-pipeline flow (m
3/ s), calculated by formula (6) or formula (7) and try to achieve;
-pipeline section amasss m
2;
The flow velocity of the recirculated water first group of return branch calculated by formula (8)
with the flow velocity of recirculated water second group of return branch
Result close with setting value, result of calculation is reliable, otherwise, should reset
with
, and recalculate from step 1)
with
until result of calculation is close with setting value;
3) flow velocity of playpipe is calculated
Setting playpipe flow velocity
, by step 1) and step 2) and calculate the flow velocity of playpipe
, result of calculation is close with setting value, and result of calculation is reliable, otherwise, should reset
, and recalculate from step 1)
until result of calculation is close with setting value;
4) pressure head that playpipe reducing place flow velocity is changed is calculated
A) according to jet orifice flow velocity after formula (9) calculating reducing
（9）
In formula:
---playpipe flow velocity m/s before reducing;
---jet orifice flow velocity m/s after reducing;
---jet segment sectional area m after reducing
2;
---playpipe sectional area m before reducing
2;
B) according to the pressure head that formula (10) calculating Venturi tube kinetic energy is changed
Δh=
2/2g （10）
In formula:
---the pressure head m that Venturi tube kinetic energy is changed;
---jet orifice flow velocity m/s after reducing, calculates according to formula (9) and tries to achieve;
-acceleration of gravity 9.8m/s
2;
5) the maximum permission superelevation of syphon calculates
A) syphon flow velocity is set
, calculate siphonal Reynolds number by the formula (1) of step 1)
, calculate siphonal relative roughness by formula (2), according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined
;
B) syphon flow velocity is calculated according to formula (11)
:
（11）
In formula:
---syphon flow velocity m/s;
the difference in height m of-syphon waste place's liquid level and entrance liquid level;
-acceleration of gravity 9.8m/s
2;
-syphon frictional resistant coefficient, according to the Reynolds number that formula (1) calculates
the relative roughness calculated with formula (2) is looked into Moody chart and is determined;
-siphon piping total length m;
-syphon diameter m;
-coefficient of partial resistance sum, namely syphon entrance is to exporting all coefficient of partial resistance sums;
Syphon flow velocity
result of calculation close with setting value, result of calculation is reliable, otherwise, should reset
, and recalculate siphonal Reynolds number and siphonal relative roughness, until
result of calculation close with setting value;
C) the maximum permission superelevation of syphon is calculated according to formula (12):
（12）
In formula:
the maximum permission superelevation m of-syphon, the potential difference namely between syphon entrance liquid level and syphon peak;
-pipe top maximum permission vacuum height m;
-syphon frictional resistant coefficient, the Reynolds number that the relative roughness calculated according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
-siphon piping total length m;
-syphon diameter m;
2-coefficient of partial resistance sum, namely syphon entrance is to all coefficient of partial resistance sums of peak;
-syphon flow velocity; M/s, calculates according to formula (11) and tries to achieve;
-acceleration of gravity 9.8m/s
2.
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| CN105525670A (en) * | 2015-01-16 | 2016-04-27 | 厦门市政工程公司 | Fresh water purifying and collecting device of urban rainwater pipeline |
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| CN105926751A (en) * | 2016-04-22 | 2016-09-07 | 中冶南方工程技术有限公司 | Freeze-proofing device for drain pipe of steam device |
| CN106957103A (en) * | 2016-10-20 | 2017-07-18 | 王海燕 | A kind of double siphon potential energy-utilized oxygen-increasing ecological beds of bionical variable cross-section（Tower）Sewage disposal device |
| CN107739068B (en) * | 2017-11-13 | 2023-09-15 | 北京众信科源科技有限公司 | Bathing sewage treatment box and control method thereof |
| CN111206562A (en) * | 2020-01-15 | 2020-05-29 | 浙江大学 | Variable-pipe-diameter high-lift slope siphon drainage device |
| CN111613558B (en) * | 2020-06-04 | 2022-08-26 | 厦门通富微电子有限公司 | Drainage device, filtering system and semiconductor processing equipment |
| CN111996982A (en) * | 2020-08-04 | 2020-11-27 | 崔士名 | Water transfer system combining level and siphon and method thereof |
| CN113230701A (en) * | 2021-04-25 | 2021-08-10 | 中煤(天津)地下工程智能研究院有限公司 | Transparent monitoring devices of unpowered multilayer position thickener |
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|---|---|---|---|---|
| DE4025463A1 (en) * | 1990-08-10 | 1992-02-13 | Weber Werner Ing Gmbh | Rain water tank for sepg. light and heavy impurities - restricts outflow flow to raise water level above normal and trap floating impurities, and collects sediment |
| CN201771050U (en) * | 2010-06-13 | 2011-03-23 | 钟惠明 | Antifreeze siphoning drainage device |
| CN203640043U (en) * | 2013-12-29 | 2014-06-11 | 康乃尔化学工业股份有限公司 | Sleeve-type Venturi siphon blow-off pipe |
-
2013
- 2013-12-29 CN CN201310736135.XA patent/CN103774747B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4025463A1 (en) * | 1990-08-10 | 1992-02-13 | Weber Werner Ing Gmbh | Rain water tank for sepg. light and heavy impurities - restricts outflow flow to raise water level above normal and trap floating impurities, and collects sediment |
| CN201771050U (en) * | 2010-06-13 | 2011-03-23 | 钟惠明 | Antifreeze siphoning drainage device |
| CN203640043U (en) * | 2013-12-29 | 2014-06-11 | 康乃尔化学工业股份有限公司 | Sleeve-type Venturi siphon blow-off pipe |
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