CN103774747A - Telescoping venturi siphoning blowdown pipe and design method - Google Patents

Telescoping venturi siphoning blowdown pipe and design method Download PDF

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CN103774747A
CN103774747A CN201310736135.XA CN201310736135A CN103774747A CN 103774747 A CN103774747 A CN 103774747A CN 201310736135 A CN201310736135 A CN 201310736135A CN 103774747 A CN103774747 A CN 103774747A
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formula
return branch
group
recirculated water
water
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CN103774747B (en
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王亮
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CONNELL CHEMICAL INDUSTRY Co Ltd
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CONNELL CHEMICAL INDUSTRY Co Ltd
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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

Bushing type venturi siphon blowing pipe and method for designing
Technical field
The present invention relates to chemical industry equipment, is a kind of for discharging bushing type venturi siphon blowing pipe and the method for designing of collecting-tank water surface dirt.
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 not in time displacement, can get back to again reclaimed water system, reduce bactericidal effect, common Circulating water effluent point is all in collecting-tank bottom, therefore, displace this part dirt and will arrange in a large number benefit clear water, 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 separately in the expenditure blowdown of collecting-tank bottom, do not add valve.The problem existing is: the bleed off pipe being arranged on 1), separately in collecting-tank can only arrange in the time of collecting-tank interior construction, cannot in the time that reclaimed water system is moved, transform; 2), owing to there is no valve, can Auto-drainage during higher than overfall at collecting-tank water level, wayward water discharge time;
2, in collecting-tank, add bleed off pipe and be connected with bottom blow-down pipe.The problem existing is 1), the bleed off pipe that is arranged in collecting-tank can only arrange in the time of collecting-tank interior construction, cannot in the time that reclaimed water system is moved, transform; 2), because raw sewage disposal tube valve is larger at collecting-tank outlet at bottom and caliber, controlled valve is cumbersome;
3, on collecting-tank pool wall, punch, increase overfall, do not add valve.The problem existing is: 1) transformation difficulty is larger, need on cement pool wall, construct, thereby destroy pool wall original structure and anticorrosion; 2) owing to there is no valve, can Auto-drainage during higher than overfall at collecting-tank water level, wayward water discharge time;
4, on collecting-tank pool wall, punch, increase overfall, add valve.The problem existing is: 1) transformation difficulty is larger, need on cement pool wall, construct, thereby destroy pool wall original structure and anticorrosion; 2), the larger controlled valve of valve caliber is cumbersome;
5, do not add bleed off pipe, directly at bottom blow-down.The problem 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 fluctuation not in time; 2), blowing time is long after sterilizing peel-off, displacement is large, waste moisturizing.
Summary of the invention
Technical problem to be solved by this invention is: the shortcoming that overcomes prior art, provide a kind of simple in structure, with low cost, switch convenient, effect significant bushing type venturi siphon blowing pipe and method for designing, can directly discharge the dirt floating on the surface, reduce the rate of water make-up after sterilizing peel-off and prevent that 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 is that the horn mouth, the outfall that immerse below the collecting-tank water surface immerse below the water surface of sewage well, at the siphonal peak air communication valve that is tightly connected, above siphonal outfall, reducer is set; 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 first group of return branch of recirculated water, playpipe stretches in syphon between siphonal peak and reducer, the reducing head of playpipe is positioned at the top of siphonal reducer, and tube wall and the syphon of playpipe 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 first group of return branch of recirculated water, second group of return branch flow velocity of recirculated water, carry out iterative computation
Set the flow velocity of first group of return branch of recirculated water and the flow velocity of second group of return branch of recirculated water
Figure 834449DEST_PATH_IMAGE004
, calculate the Reynolds number of first group of return branch of recirculated water according to formula (1)
Figure 614187DEST_PATH_IMAGE006
reynolds number with second group of return branch of recirculated water
Figure 947079DEST_PATH_IMAGE008
Figure 452796DEST_PATH_IMAGE010
(1)
In formula: -Reynolds number;
Figure 666926DEST_PATH_IMAGE014
-pipe flow speed (m/s) is set in formula (1);
Figure 803509DEST_PATH_IMAGE016
-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 first group of return branch of formula (2) computation cycles water and second group of return branch of recirculated water:
Relative roughness
Figure 278801DEST_PATH_IMAGE020
(2)
In formula:
Figure 33130DEST_PATH_IMAGE022
-pipeline roughness height, can table look-up and draw according to pipe material;
Figure 707825DEST_PATH_IMAGE016
-pipe diameter (mm);
B) according to the pipeline impedance of first group of return branch of formula (3) computation cycles water
Figure 916696DEST_PATH_IMAGE024
pipeline impedance with second group of return branch of recirculated water
Figure 284224DEST_PATH_IMAGE026
Figure 712800DEST_PATH_IMAGE028
(3)
In formula:
Figure 987924DEST_PATH_IMAGE030
the impedance of-pipeline;
Figure 569078DEST_PATH_IMAGE032
-pipeline on-way resistance coefficient, the Reynolds number that the relative roughness of calculating according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
-pipeline total length (m);
Figure 259264DEST_PATH_IMAGE036
-pipe diameter (m);
Figure 338079DEST_PATH_IMAGE038
-coefficient of partial resistance sum;
-coefficient of partial resistance;
Figure 732337DEST_PATH_IMAGE042
-pi;
Figure 386039DEST_PATH_IMAGE044
-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:
Figure 558712DEST_PATH_IMAGE048
pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
Figure 63828DEST_PATH_IMAGE052
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
Figure 645431DEST_PATH_IMAGE056
（5）
In formula:
Figure 696563DEST_PATH_IMAGE058
pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
Figure 808744DEST_PATH_IMAGE050
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
Figure 970736DEST_PATH_IMAGE060
the number of tubes of first group of return branch of-recirculated water;
the number of tubes of second group of return branch of-recirculated water;
E) flow of computation cycles water return branch
By formula (4) substitution formula (5):
Figure 2069DEST_PATH_IMAGE064
(6)
In formula:
Figure 352279DEST_PATH_IMAGE066
-recirculated water return main's pipeline flow;
Figure 567229DEST_PATH_IMAGE068
pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
Figure 686494DEST_PATH_IMAGE070
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
Figure 564583DEST_PATH_IMAGE060
the number of tubes of first group of return branch of-recirculated water;
Figure 402089DEST_PATH_IMAGE062
the number of tubes of second group of return branch of-recirculated water;
Figure 968199DEST_PATH_IMAGE052
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Figure 456818DEST_PATH_IMAGE054
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Calculated the flow of first group of return branch of recirculated water by formula (6)
Figure 755076DEST_PATH_IMAGE068
;
By formula (4) substitution formula (5):
Figure DEST_PATH_IMAGE072
(7)
The same formula of symbol definition (6) in formula
Calculated the flow of second group of return branch of recirculated water by formula (7)
Figure 771223DEST_PATH_IMAGE050
;
F) flow velocity of computation cycles water return branch
Calculate the flow velocity of first group of return branch of formula (8) computation cycles water according to pipe flow speed
Figure DEST_PATH_IMAGE074
flow velocity with second group of return branch of recirculated water
Figure DEST_PATH_IMAGE076
:
Figure DEST_PATH_IMAGE078
(8)
In formula:
Figure 954074DEST_PATH_IMAGE014
-pipe flow speed (m/s);
Figure DEST_PATH_IMAGE080
-pipeline flow (m 3/ s); Calculate and try to achieve by formula (6) or formula (7),
-pipeline section amasss (m 2);
The flow velocity of first group of return branch of recirculated water of being calculated by formula (8)
Figure 969303DEST_PATH_IMAGE074
flow velocity with second group of return branch of recirculated water
Figure 766358DEST_PATH_IMAGE076
Result with setting value close, result of calculation is reliable, otherwise, should reset
Figure 312877DEST_PATH_IMAGE074
with
Figure 171855DEST_PATH_IMAGE076
, and start to recalculate from step 1)
Figure 120219DEST_PATH_IMAGE074
with until result of calculation and setting value are close;
3) flow velocity of calculating playpipe
Set playpipe flow velocity
Figure DEST_PATH_IMAGE082
, by step 1) and step 2) and calculate the flow velocity of playpipe
Figure 212809DEST_PATH_IMAGE082
, result of calculation is close with setting value, and result of calculation is reliable, otherwise, should reset
Figure 997357DEST_PATH_IMAGE082
, and start to recalculate from step 1)
Figure 708961DEST_PATH_IMAGE082
until result of calculation and setting value are close;
4) calculate the pressure head that playpipe reducing place flow velocity is changed
A) according to jet orifice flow velocity after formula (9) calculating reducing
Figure DEST_PATH_IMAGE084
Figure DEST_PATH_IMAGE086
（9）
In formula:
Figure DEST_PATH_IMAGE090
---playpipe flow velocity (m/s) before reducing;
Figure DEST_PATH_IMAGE092
---jet orifice flow velocity (m/s) after reducing;
Figure DEST_PATH_IMAGE094
---jet segment sectional area (m after reducing 2);
Figure DEST_PATH_IMAGE096
---playpipe sectional area (m before reducing 2);
B) calculate according to formula (10) pressure head that Venturi tube kinetic energy is changed
Δh=
Figure 129141DEST_PATH_IMAGE092
2/2g （10）
In formula: ---the pressure head (m) that Venturi tube kinetic energy is changed;
Figure 891168DEST_PATH_IMAGE092
---jet orifice flow velocity (m/s) after reducing, calculates and tries to achieve according to formula (9);
Figure 661546DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
5) the maximum superelevation that allows of syphon is calculated
A) set syphon flow velocity
Figure DEST_PATH_IMAGE100
, calculate siphonal Reynolds number by the formula (1) of step 1) , calculate siphonal relative roughness by formula (2), the Reynolds number calculating according to formula (1)
Figure 537361DEST_PATH_IMAGE102
and formula (2) calculate relative roughness look into Moody chart determine
Figure 460317DEST_PATH_IMAGE104
;
B) calculate syphon flow velocity according to formula (11)
Figure 770076DEST_PATH_IMAGE100
:
Figure 27751DEST_PATH_IMAGE106
（11）
In formula:
Figure 18841DEST_PATH_IMAGE100
---syphon flow velocity; (m/s);
Figure 549966DEST_PATH_IMAGE108
the difference in height (m) of-syphon blowdown exit liquid level and entrance liquid level;
Figure 30626DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
Figure 260750DEST_PATH_IMAGE104
-syphon on-way resistance coefficient, the Reynolds number calculating according to formula (1) and formula (2) calculate relative roughness look into Moody chart determine;
Figure 999085DEST_PATH_IMAGE110
-siphon piping total length (m);
-syphon diameter (m);
-coefficient of partial resistance sum, syphon entrance is to exporting all coefficient of partial resistance sums;
Syphon flow velocity
Figure 654953DEST_PATH_IMAGE100
result of calculation with setting value close, result of calculation is reliable, otherwise, should reset , and recalculate siphonal Reynolds number and siphonal relative roughness, until
Figure 478739DEST_PATH_IMAGE100
result of calculation with setting value close;
C) calculate the maximum superelevation that allows of syphon according to formula (12):
Figure 683455DEST_PATH_IMAGE116
（12）
In formula:
Figure 567841DEST_PATH_IMAGE118
maximum superelevation (m), the i.e. potential difference between syphon entrance liquid level and syphon peak of allowing of-syphon;
Figure 971141DEST_PATH_IMAGE120
the maximum vacuum height (m) that allows in-pipe top;
Figure 167767DEST_PATH_IMAGE104
-syphon on-way resistance coefficient, the Reynolds number that the relative roughness of calculating according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
Figure 109047DEST_PATH_IMAGE110
-siphon piping total length (m);
Figure 783742DEST_PATH_IMAGE112
-syphon diameter (m);
Figure 995542DEST_PATH_IMAGE121
2-coefficient of partial resistance sum, syphon entrance is to all coefficient of partial resistance sums of peak;
Figure 363070DEST_PATH_IMAGE100
-syphon flow velocity; (m/s), calculate and try to achieve according to formula (11);
Figure 339116DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2.
Bushing type venturi siphon blowing pipe of the present invention and method for designing, the circulating water flow in playpipe after reducing head flow velocity increase and pressure energy reduces, thereby produce negative pressure in the both sides of playpipe and start to inhale the air in syphon, same venturi principle, because horn mouth and the delivery port of syphon water intake end are all immersed in collecting-tank water level and the water below sewage well water level, therefore, automatic generation siphon drainage after the air in syphon blots, the communicating valve that now can close playpipe and first group of return branch of recirculated water, siphon can not stop; Need to stop siphon time, make air enter syphon, the horn mouth of syphon water intake end has strengthened the area of water inlet, is beneficial to floating pollutant on the water surface and enters syphon.When use, horn mouth and the outfall of syphon water intake end are immersed respectively in collecting-tank water level and the water below sewage well water level, the water compensating valve of opening playpipe injects recirculated water in playpipe, when recirculated water in playpipe flows into sewage well, also the air in emptying syphon, thereby automatically generate siphon drainage, close afterwards water compensating valve.Need to stop siphon time, open the air communication valve of syphon peak, can automatically stop siphon because air enters, or make more than the horn mouth of syphon water intake end exceeds collecting-tank water level, also can stop siphon.Have simple in structure, with low cost, switch convenient, control freely, the significant advantage of effect.
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 local enlarged diagram 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 that has 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 first group of recirculated water return branch, 12 second group of recirculated water return branch, 13 recirculated water return mains, 14 recirculated water collecting-tanks.
The specific embodiment
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 is to immerse horn mouth 2 below 1 of collecting-tank water level, water level that outfall 7 immerses sewage well below 7, at the peak of the syphon 3 air communication valve 4 that is tightly connected, above the outfall 7 of syphon 3, reducer 8 is set; Described playpipe 5 one end are provided with the reducing head 9, the other end that are fixed with one and are tightly connected by water compensating valve 10 and first group of return branch 11 of recirculated water, playpipe 5 stretches in syphon 3 between the peak of syphon 3 and reducer 8, 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.The commercially available prod that described air communication valve 4 and water compensating valve 10 are 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 first group of return branch of the playpipe of bushing type venturi siphon blowing pipe and recirculated water is tightly connected.
The bushing type venturi siphon blowing pipe method for designing of the present embodiment comprises the following steps:
1) set first group of return branch of recirculated water, second group of return branch flow velocity of recirculated water, carry out iterative computation
Set the flow velocity of first group of return branch of recirculated water and the flow velocity of second group of return branch of recirculated water , calculate the Reynolds number of first group of return branch of recirculated water according to formula (1)
Figure 686154DEST_PATH_IMAGE122
reynolds number with second group of return branch of recirculated water
Figure 415076DEST_PATH_IMAGE123
Figure 618524DEST_PATH_IMAGE124
(1)
In formula:
Figure DEST_PATH_IMAGE126
-Reynolds number;
-pipe flow speed (m/s) is set in formula (1);
Figure 373301DEST_PATH_IMAGE016
-pipe diameter (m);
Figure 527202DEST_PATH_IMAGE018
the motion coefficient of viscosity of-medium, the motion coefficient of viscosity of water is 1.31*10 -6(m 2/ s);
Figure 95193DEST_PATH_IMAGE128
=824427
Figure DEST_PATH_IMAGE130
=1236641
2) computation cycles water return branch flow velocity
A) according to the pipeline relative roughness of first group of return branch of formula (2) computation cycles water and second group of return branch of recirculated water:
Relative roughness (2)
In formula: -pipeline roughness height, can table look-up and draw according to pipe material; The present embodiment is carbon steel tube, and pipeline roughness height is 0.046mm;
Figure 136093DEST_PATH_IMAGE016
-pipe diameter (mm), the present embodiment is DN600mm, DN900mm;
First group of return branch relative roughness of recirculated water
Figure 265592DEST_PATH_IMAGE132
=0.000077
Second group of return branch relative roughness of recirculated water
Figure DEST_PATH_IMAGE135
=0.000051
Looking into Moody chart obtains
Figure DEST_PATH_IMAGE137
=0.012,
Figure DEST_PATH_IMAGE139
=0.011
B) according to the pipeline impedance of first group of return branch of formula (3) computation cycles water
Figure DEST_PATH_IMAGE141
pipeline impedance with second group of return branch of recirculated water
Figure DEST_PATH_IMAGE142
Figure DEST_PATH_IMAGE143
(3)
In formula:
Figure 831090DEST_PATH_IMAGE030
the impedance of-pipeline;
Figure 251707DEST_PATH_IMAGE032
-pipeline on-way resistance coefficient, the Reynolds number that the relative roughness of calculating according to formula (2) and formula (1) calculate is looked into Moody chart and is determined; Looking into Moody chart obtains
Figure 661960DEST_PATH_IMAGE137
=0.012,
Figure 696781DEST_PATH_IMAGE139
=0.011
Figure 559694DEST_PATH_IMAGE034
-pipeline total length (m); First group of return branch of the present embodiment recirculated water, second group of return branch of recirculated water are 10m;
Figure 472418DEST_PATH_IMAGE036
-pipe diameter (m); First group of return branch of the present embodiment recirculated water is 0.9m, second group of return branch 0.6m of recirculated water;
Figure 737177DEST_PATH_IMAGE121
-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;
Figure 208479DEST_PATH_IMAGE042
-pi;
Figure 621005DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
Calculating is tried to achieve
Figure DEST_PATH_IMAGE144
=0.51748;
Figure DEST_PATH_IMAGE145
=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):
Figure DEST_PATH_IMAGE146
(4)
In formula: pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
Figure DEST_PATH_IMAGE148
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Figure 57683DEST_PATH_IMAGE145
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
Figure DEST_PATH_IMAGE149
（5）
In formula:
Figure 136104DEST_PATH_IMAGE147
pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
Figure DEST_PATH_IMAGE150
the number of tubes of first group of return branch of-recirculated water; The present embodiment is 4;
Figure DEST_PATH_IMAGE151
the number of tubes of second group of return branch of-recirculated water; The present embodiment is 3;
E) flow of computation cycles water return branch
By formula (4) substitution formula (5):
(6)
In formula:
Figure 352770DEST_PATH_IMAGE066
-recirculated water return main's pipeline flow; The present embodiment is 5.556 m 3/ s,
Figure 326543DEST_PATH_IMAGE147
pipeline flow (the m of first group of return branch of-recirculated water 3/ s);
Figure 139647DEST_PATH_IMAGE148
pipeline flow (the m of second group of return branch of-recirculated water 3/ s);
Figure 464449DEST_PATH_IMAGE150
the number of tubes of first group of return branch of-recirculated water; The present embodiment is 4;
Figure 260016DEST_PATH_IMAGE151
the number of tubes of second group of return branch of-recirculated water; The present embodiment is 3;
Figure 353874DEST_PATH_IMAGE144
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Figure 150929DEST_PATH_IMAGE145
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Calculated the flow of first group of return branch of recirculated water by formula (6)
Figure 946715DEST_PATH_IMAGE147
, the flow of first group of return branch of the present embodiment recirculated water
Figure 57891DEST_PATH_IMAGE147
for 0.5108m 3/ s;
By formula (4) substitution formula (5):
Figure DEST_PATH_IMAGE153
(7)
The same formula of symbol definition (6) in formula
Calculated the flow of second group of return branch of recirculated water by formula (7)
Figure DEST_PATH_IMAGE154
=1.1706m 3/ s;
F) flow velocity of computation cycles water return branch
Calculate the flow velocity of first group of return branch of formula (8) computation cycles water according to pipe flow speed
Figure 694671DEST_PATH_IMAGE074
flow velocity with second group of return branch of recirculated water ;
Figure DEST_PATH_IMAGE155
(8)
In formula:
Figure 883393DEST_PATH_IMAGE014
-pipe flow speed (m/s);
Figure DEST_PATH_IMAGE157
-pipeline flow (m 3/ s);
Figure DEST_PATH_IMAGE159
-pipeline section amasss (m 2);
Calculated the flow velocity of first group of return branch of recirculated water by formula (8)
Figure 139537DEST_PATH_IMAGE074
=1.81m/s, the flow velocity of second group of return branch of the present embodiment recirculated water
Figure 270304DEST_PATH_IMAGE076
=1.84m/s, ,
Figure 618688DEST_PATH_IMAGE076
close with setting value, result of calculation is reliable;
3) flow velocity of calculating playpipe
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 first group of return branch of recirculated water:
Set playpipe flow velocity
Figure 868404DEST_PATH_IMAGE082
=2m/s, calculates playpipe Reynolds number by the formula (1) of step 1)
Figure DEST_PATH_IMAGE161
=76336, the relative roughness of being calculated playpipe by formula (2) is 0.000092, looks into Moody chart and obtains playpipe on-way resistance coefficient
Figure DEST_PATH_IMAGE163
=0.012, can obtain by formula (6)
Figure DEST_PATH_IMAGE165
=0.004m 3/ s, obtains by formula (8)
Figure 369241DEST_PATH_IMAGE082
=2.04m/s, close with setting value, result of calculation is reliable;
4) calculate the pressure head that playpipe reducing place flow velocity is changed
A) according to jet orifice flow velocity after formula (9) calculating reducing
Figure DEST_PATH_IMAGE086A
（9）
In formula:
Figure 562774DEST_PATH_IMAGE090
---playpipe flow velocity (m/s) before reducing; The present embodiment is 2.04m/s;
Figure 616180DEST_PATH_IMAGE092
---jet orifice flow velocity (m/s) after reducing;
Figure 580594DEST_PATH_IMAGE094
---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
Figure DEST_PATH_IMAGE167
=8.12m/s;
B) calculate according to formula (10) pressure head that Venturi tube kinetic energy is changed
Δh=
Figure 998937DEST_PATH_IMAGE092
2/2g=3.364m （10）
In formula:
Figure 976864DEST_PATH_IMAGE098
---the pressure head (m) that Venturi tube kinetic energy is changed;
Figure 771645DEST_PATH_IMAGE092
---jet orifice flow velocity (m/s) after reducing, calculates according to formula (9) that to try to achieve the present embodiment be 8.12m/s;
Figure 652882DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
5) the maximum superelevation that allows of syphon is calculated
A) set syphon flow velocity
Figure 304443DEST_PATH_IMAGE100
, calculate siphonal Reynolds number by the formula (1) of step 1)
Figure 287443DEST_PATH_IMAGE102
, calculate siphonal relative roughness by formula (2), the Reynolds number calculating according to formula (1)
Figure 371067DEST_PATH_IMAGE102
and formula (2) calculate relative roughness look into Moody chart determine
Figure 857543DEST_PATH_IMAGE104
be 0.017;
B) calculate syphon flow velocity according to formula (11):
Figure 945585DEST_PATH_IMAGE106
=1.1832 m/s （11）
In formula:
Figure 399569DEST_PATH_IMAGE100
---syphon flow velocity; (m/s);
Figure 270573DEST_PATH_IMAGE108
the difference in height (m) of-syphon blowdown exit liquid level and entrance liquid level; The present embodiment is 3m;
Figure 630797DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
Figure 889740DEST_PATH_IMAGE104
-syphon on-way resistance coefficient, the Reynolds number calculating according to formula (1)
Figure 316173DEST_PATH_IMAGE102
and formula (2) calculate relative roughness look into Moody chart determine; Looking into Moody chart, can to obtain the present embodiment friction loss be 0.017;
Figure 505715DEST_PATH_IMAGE110
-siphon piping total length (m); The present embodiment is 10m;
Figure 966783DEST_PATH_IMAGE112
-syphon diameter (m); The present embodiment is DN100mm, 0.1m;
Figure 131049DEST_PATH_IMAGE114
-coefficient of partial resistance sum, syphon entrance is to exporting all local resistance sums; The present embodiment is 2.5;
Figure 61090DEST_PATH_IMAGE100
=1.1832 m/s, result of calculation is close with setting value, and result of calculation is reliable;
C) calculate the maximum superelevation that allows of syphon according to formula (12):
Figure 539475DEST_PATH_IMAGE116
=6.71111 （12）
In formula:
Figure 104318DEST_PATH_IMAGE118
maximum superelevation (m), the i.e. potential difference between syphon entrance liquid level and syphon peak of allowing of-syphon;
the maximum vacuum height (m) that allows in-pipe top, generally gets 7m in theory;
Figure 106089DEST_PATH_IMAGE104
-syphon on-way resistance coefficient, the Reynolds number calculating according to formula (1)
Figure 135968DEST_PATH_IMAGE102
and formula (2) calculate relative roughness look into Moody chart determine; Tabling look-up and can obtaining the present embodiment friction loss is 0.017;
Figure 633946DEST_PATH_IMAGE110
-siphon piping total length (m); The present embodiment is 10m;
Figure 77697DEST_PATH_IMAGE112
-syphon diameter (m); The present embodiment is DN100mm, 0.1m;
Figure 480865DEST_PATH_IMAGE121
2-coefficient of partial resistance sum, syphon entrance is to all local resistance sums of peak; The present embodiment is 1.5;
Figure 301054DEST_PATH_IMAGE100
-syphon flow velocity; (m/s), calculate and try to achieve according to formula (11); The present embodiment is 1.1832 m/s;
Figure 341953DEST_PATH_IMAGE044
-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).
Bushing type venturi siphon blowing pipe and the method for designing of the present embodiment, because syphon 3 water inlets and delivery port are all immersed in collecting-tank water level 1 and the water of sewage well water level below 6, therefore, automatic generation siphon drainage after the air in syphon 3 blots, the communicating valve that now can close playpipe 5 and first group of return branch 11 of recirculated water, siphon can not stop; Need to stop siphon time, make air enter syphon 3, the horn mouth 2 of syphon 3 water intake ends has strengthened the area of water inlet, is beneficial to floating pollutant on the water surface and enters syphon 3.When use, horn mouth 2 and the outfall 7 of syphon 3 water intake ends are immersed respectively in collecting-tank water level 1 and the water of sewage well water level below 6, open the water compensating valve 10 of playpipe 5 toward the interior injection recirculated water of playpipe 5, when recirculated water in playpipe 5 flows into sewage well, also the air in emptying syphon 3, thereby automatically generate siphon drainage, close afterwards water compensating valve 10.Need to stop siphon time, open the air communication valve 4 of syphon 3 peaks, can automatically stop siphon because air enters, or make the horn mouth 2 of syphon 3 water intake ends exceed collecting-tank water level 1, also can stop siphon.Have simple in structure, with low cost, switch convenient, control freely, the significant advantage of effect.
The present invention is not only for the discharge of collecting-tank water surface dirt after reclaimed water system sterilizing peel-off, also applicable to discharging water surface dirt and possess water side and occasion that outfall all immerses the following and required make-up water source of playpipe of water level.

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 is that the horn mouth, the outfall that immerse below the collecting-tank water surface immerse below the water surface of sewage well, at the siphonal peak air communication valve that is tightly connected, above siphonal outfall, reducer is set; 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 first group of return pipe of recirculated water, playpipe stretches in syphon between siphonal peak and reducer, the reducing head of playpipe is positioned at the top of siphonal reducer, and tube wall and the syphon of playpipe 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 first group of return branch of recirculated water, second group of return branch flow velocity of recirculated water, carry out iterative computation
Set the flow velocity of first group of return branch of recirculated water
Figure RE-RE-573045DEST_PATH_IMAGE002
and the flow velocity of second group of return branch of recirculated water
Figure RE-RE-824029DEST_PATH_IMAGE004
, calculate the Reynolds number of first group of return branch of recirculated water according to formula (1) reynolds number with second group of return branch of recirculated water
Figure RE-RE-779532DEST_PATH_IMAGE008
(1)
In formula:
Figure RE-RE-693579DEST_PATH_IMAGE012
-Reynolds number;
Figure RE-RE-730936DEST_PATH_IMAGE014
-pipe flow speed m/s sets in formula (1);
Figure RE-RE-120329DEST_PATH_IMAGE016
-pipe diameter m;
Figure RE-RE-214800DEST_PATH_IMAGE018
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 first group of return branch of formula (2) computation cycles water and second group of return branch of recirculated water:
Relative roughness
Figure RE-RE-424064DEST_PATH_IMAGE020
(2)
In formula:
Figure RE-RE-265112DEST_PATH_IMAGE022
-pipeline roughness height, can table look-up and draw according to pipe material;
Figure RE-RE-509012DEST_PATH_IMAGE016
-pipe diameter (mm);
B) according to the pipeline impedance of first group of return branch of formula (3) computation cycles water
Figure RE-RE-777313DEST_PATH_IMAGE024
pipeline impedance with second group of return branch of recirculated water
Figure RE-RE-739453DEST_PATH_IMAGE026
Figure RE-RE-118613DEST_PATH_IMAGE028
(3)
In formula:
Figure RE-RE-217019DEST_PATH_IMAGE030
the impedance of-pipeline;
Figure RE-RE-659151DEST_PATH_IMAGE032
-pipeline on-way resistance coefficient, the Reynolds number that the relative roughness of calculating according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
Figure RE-RE-843008DEST_PATH_IMAGE034
-pipeline total length m;
Figure RE-RE-212809DEST_PATH_IMAGE036
-pipe diameter m;
Figure RE-RE-182033DEST_PATH_IMAGE038
-coefficient of partial resistance sum;
Figure RE-RE-41405DEST_PATH_IMAGE040
-coefficient of partial resistance;
-pi;
Figure RE-RE-371203DEST_PATH_IMAGE044
-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):
Figure RE-RE-444202DEST_PATH_IMAGE046
(4)
In formula: the pipeline flow m of first group of return branch of-recirculated water 3/ s;
the pipeline flow m of second group of return branch of-recirculated water 3/ s;
Figure RE-RE-967696DEST_PATH_IMAGE052
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Figure RE-RE-911513DEST_PATH_IMAGE054
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
D) recirculated water return main and recirculated water return branch have the relation of formula (5):
Figure RE-RE-112687DEST_PATH_IMAGE056
（5）
In formula:
Figure RE-RE-305902DEST_PATH_IMAGE058
the pipeline flow m of first group of return branch of-recirculated water 3/ s;
Figure RE-RE-634246DEST_PATH_IMAGE050
the pipeline flow m of second group of return branch of-recirculated water 3/ s;
Figure RE-RE-619520DEST_PATH_IMAGE060
the number of tubes of first group of return branch of-recirculated water;
Figure RE-RE-991595DEST_PATH_IMAGE062
the number of tubes of second group of return branch of-recirculated water;
E) flow of computation cycles water return branch
By formula (4) substitution formula (5):
Figure RE-RE-624438DEST_PATH_IMAGE064
(6)
In formula: -recirculated water return main's pipeline flow;
the pipeline flow m of first group of return branch of-recirculated water 3/ s;
Figure RE-RE-935968DEST_PATH_IMAGE070
the pipeline flow m of second group of return branch of-recirculated water 3/ s;
Figure RE-RE-307037DEST_PATH_IMAGE060
the number of tubes of first group of return branch of-recirculated water;
Figure RE-RE-960873DEST_PATH_IMAGE062
the number of tubes of second group of return branch of-recirculated water;
Figure RE-RE-733788DEST_PATH_IMAGE052
the pipeline impedance of first group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Figure RE-RE-385349DEST_PATH_IMAGE054
the pipeline impedance of second group of return branch of-recirculated water, calculates and tries to achieve according to formula (3);
Calculated the flow of first group of return branch of recirculated water by formula (6)
Figure RE-RE-227403DEST_PATH_IMAGE068
;
By formula (4) substitution formula (5):
(7)
The same formula of symbol definition (6) in formula
Calculated the flow of second group of return branch of recirculated water by formula (7)
Figure RE-RE-495049DEST_PATH_IMAGE050
;
F) flow velocity of computation cycles water return branch
Calculate the flow velocity of first group of return branch of formula (8) computation cycles water according to pipe flow speed
Figure RE-RE-DEST_PATH_IMAGE074
flow velocity with second group of return branch of recirculated water
Figure RE-RE-DEST_PATH_IMAGE076
:
Figure RE-RE-DEST_PATH_IMAGE078
(8)
In formula:
Figure RE-RE-997837DEST_PATH_IMAGE014
-pipe flow speed m/s;
Figure RE-RE-DEST_PATH_IMAGE080
-pipeline flow (m 3/ s), calculate and try to achieve by formula (6) or formula (7);
Figure RE-RE-DEST_PATH_IMAGE082
-pipeline section amasss m 2;
The flow velocity of first group of return branch of recirculated water of being calculated by formula (8) flow velocity with second group of return branch of recirculated water
Figure RE-RE-25015DEST_PATH_IMAGE076
Result with setting value close, result of calculation is reliable, otherwise, should reset with
Figure RE-RE-708773DEST_PATH_IMAGE076
, and start to recalculate from step 1)
Figure RE-RE-764454DEST_PATH_IMAGE074
with
Figure RE-RE-331833DEST_PATH_IMAGE076
until result of calculation and setting value are close;
3) flow velocity of calculating playpipe
Set playpipe flow velocity
Figure RE-RE-DEST_PATH_IMAGE084
, by step 1) and step 2) and calculate the flow velocity of playpipe
Figure RE-RE-209790DEST_PATH_IMAGE084
, result of calculation is close with setting value, and result of calculation is reliable, otherwise, should reset
Figure RE-RE-733175DEST_PATH_IMAGE084
, and start to recalculate from step 1)
Figure RE-RE-959757DEST_PATH_IMAGE084
until result of calculation and setting value are close;
4) calculate the pressure head that playpipe reducing place flow velocity is changed
A) according to jet orifice flow velocity after formula (9) calculating reducing
Figure RE-RE-DEST_PATH_IMAGE086
Figure RE-RE-DEST_PATH_IMAGE088
Figure RE-RE-DEST_PATH_IMAGE090
（9）
In formula:
Figure RE-RE-DEST_PATH_IMAGE092
---playpipe flow velocity m/s before reducing;
Figure RE-RE-DEST_PATH_IMAGE094
---jet orifice flow velocity m/s after reducing;
Figure RE-RE-DEST_PATH_IMAGE096
---jet segment sectional area m after reducing 2;
Figure RE-RE-DEST_PATH_IMAGE098
---playpipe sectional area m before reducing 2;
B) calculate according to formula (10) pressure head that Venturi tube kinetic energy is changed
Δh= 2/2g （10）
In formula:
Figure RE-RE-DEST_PATH_IMAGE100
---the pressure head m that Venturi tube kinetic energy is changed;
Figure RE-RE-53670DEST_PATH_IMAGE094
---jet orifice flow velocity m/s after reducing, calculates and tries to achieve according to formula (9);
Figure RE-RE-493879DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
5) the maximum superelevation that allows of syphon is calculated
A) set syphon flow velocity
Figure RE-RE-DEST_PATH_IMAGE102
, calculate siphonal Reynolds number by the formula (1) of step 1)
Figure RE-RE-898884DEST_PATH_IMAGE104
, calculate siphonal relative roughness by formula (2), the Reynolds number calculating according to formula (1)
Figure RE-RE-424544DEST_PATH_IMAGE104
and formula (2) calculate relative roughness look into Moody chart determine
Figure RE-RE-DEST_PATH_IMAGE106
;
B) calculate syphon flow velocity according to formula (11)
Figure RE-RE-644304DEST_PATH_IMAGE102
:
Figure RE-RE-DEST_PATH_IMAGE108
（11）
In formula:
Figure RE-RE-752068DEST_PATH_IMAGE102
---syphon flow velocity m/s;
Figure RE-RE-DEST_PATH_IMAGE110
the difference in height m of-syphon blowdown exit liquid level and entrance liquid level;
Figure RE-RE-336764DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2;
-syphon on-way resistance coefficient, the Reynolds number calculating according to formula (1) and formula (2) calculate relative roughness look into Moody chart determine;
-siphon piping total length m;
Figure RE-RE-DEST_PATH_IMAGE114
-syphon diameter m;
Figure RE-RE-DEST_PATH_IMAGE116
-coefficient of partial resistance sum, syphon entrance is to exporting all coefficient of partial resistance sums;
Syphon flow velocity result of calculation with setting value close, result of calculation is reliable, otherwise, should reset
Figure RE-RE-963475DEST_PATH_IMAGE102
, and recalculate siphonal Reynolds number and siphonal relative roughness, until
Figure RE-RE-401410DEST_PATH_IMAGE102
result of calculation with setting value close;
C) calculate the maximum superelevation that allows of syphon according to formula (12):
Figure RE-RE-DEST_PATH_IMAGE118
（12）
In formula:
Figure RE-RE-DEST_PATH_IMAGE120
maximum superelevation m, the i.e. potential difference between syphon entrance liquid level and syphon peak of allowing of-syphon;
Figure RE-RE-DEST_PATH_IMAGE122
the maximum vacuum height m that allows in-pipe top;
Figure RE-RE-28219DEST_PATH_IMAGE106
-syphon on-way resistance coefficient, the Reynolds number that the relative roughness of calculating according to formula (2) and formula (1) calculate is looked into Moody chart and is determined;
Figure RE-RE-48259DEST_PATH_IMAGE112
-siphon piping total length m;
Figure RE-RE-37074DEST_PATH_IMAGE114
-syphon diameter m;
Figure RE-RE-DEST_PATH_IMAGE123
2-coefficient of partial resistance sum, syphon entrance is to all coefficient of partial resistance sums of peak;
-syphon flow velocity; M/s, calculates and tries to achieve according to formula (11);
Figure RE-RE-61979DEST_PATH_IMAGE044
-acceleration of gravity 9.8m/s 2.
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CN105484353A (en) * 2016-01-15 2016-04-13 罗昌明 Urban sewage irrigation station and self-irrigation drainage system
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
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
CN107739068A (en) * 2017-11-13 2018-02-27 北京众信科源科技有限公司 A kind of bath sewage treatment box and its control method
CN111206562A (en) * 2020-01-15 2020-05-29 浙江大学 Variable-pipe-diameter high-lift slope siphon drainage device
CN111613558A (en) * 2020-06-04 2020-09-01 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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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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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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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN105484353A (en) * 2016-01-15 2016-04-13 罗昌明 Urban sewage irrigation station and self-irrigation drainage system
CN105484353B (en) * 2016-01-15 2018-04-20 罗昌明 A kind of municipal sewage pumping irrigation station and drainage system is irrigated by lifting water to a higher level with a water pump, etc. certainly
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
CN107739068A (en) * 2017-11-13 2018-02-27 北京众信科源科技有限公司 A kind of bath sewage treatment box and its control method
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
CN111613558A (en) * 2020-06-04 2020-09-01 厦门通富微电子有限公司 Drainage device, filtering system and semiconductor processing equipment
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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