CN105735421B - Reduce the protecting water hammer structure and method of air tank total measurement (volume) - Google Patents
Reduce the protecting water hammer structure and method of air tank total measurement (volume) Download PDFInfo
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- CN105735421B CN105735421B CN201610110923.1A CN201610110923A CN105735421B CN 105735421 B CN105735421 B CN 105735421B CN 201610110923 A CN201610110923 A CN 201610110923A CN 105735421 B CN105735421 B CN 105735421B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 140
- 238000005259 measurement Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005086 pumping Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 8
- 230000009467 reduction Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 19
- 238000010586 diagram Methods 0.000 description 6
- 230000003020 moisturizing effect Effects 0.000 description 6
- 230000006378 damage Effects 0.000 description 5
- 230000006837 decompression Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 5
- 230000000630 rising effect Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000004744 fabric Substances 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons or valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
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- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of protecting water hammer structure and method for reducing air tank total measurement (volume), it is to be respectively provided with air tank at pipe-line system two ends, stem air tank is close to water pump, tail air tank is close to pipe end valve, when pumping for water pump is powered off, afterbody valve receives signal according to the automatic quick closedown of the rule set in advance.The present invention is being met on the premise of other adjust guaranteed requests, can greatly reduce the volume of air tank in long range water supply project, investment reduction, and especially for long range water system, effect is more notable.
Description
Technical field
The present invention relates to long range hydrotechny field, and in particular to a kind of that gentle long range waterman is arranged in pipeline
Cheng Zhong, for the protecting water hammer structure and method of the total measurement (volume) for reducing air tank.
Background technology
In pumping plant water-carriage system, due to the generation for the loss of power accident of drawing water, water pump assembly rotating speed reduces rapidly, pressure after pump
Pipeline is transmitted after rapid reduction, decompression wave direction pump, causes occur serious decompression along water-carriage system pipeline, pipeline initial pressure compared with
Dot is probably due to decompression is excessive and is down to pressure for vaporization, and generation column separation phenomenon, the water hammer that makes up of its induction will be produced very
Big pressure, jeopardizes the safety of pipeline.
Air tank is closed high-pressure bottle, and its top is gases at high pressure, and bottom is water body, and bottom passes through short tube and supervisor
Road is connected, the closed air chamber formed using tank body wall and the water surface, compression and expansion characteristics by gas, to reflect water hammer
Ripple, suppresses water-level fluctuation, it is ensured that the safe and stable operation of water-carriage system.Set after in pump after air tank protection, tank inner high voltage
Gas drives water body in tank to be supplemented to pipeline, and to avoid in pipeline, pressure decline is too fast, and its preventing principle is similar to gas in power station
Pad surge-chamber.In order to give full play to the water hammer regulating power of air tank, air tank should be arranged close to water pump as best one can, to prevent
There is negative pressure in pipeline after pump.In negative pressure measure on long distance water transfer pumping plant is eliminated, air tank, which has, installs management conveniently, right
The advantages of place is not strict with.
Air tank has obtained good application as effective negative protecting water hammer measure in pumping plant water-carriage system.However,
If aqueduct is longer, flow is larger, and water body inertia is larger in pipeline, required air tank build also inevitable larger, Jin Erhui
Cause protection cost too high and operational management is inconvenient.The larger main cause of air tank volume of setting is：(1) pipeline distance compared with
Long, required rate of water make-up is big；(2) pipeline arrangement is shallower, and system head and the tail landform lift very little, aqueous reflux power is small, is managed after power-off
The moisturizing of road system air tank after pump.First point is that system is determined in itself, it is more difficult to overcome, and is needed when power is off fast
Speed closes valve after pump, and air tank is avoided as far as possible to forebay and the two-way moisturizing of pipeline；For second point, then quick closedown is needed
Water system afterbody valve, it is to avoid water body is lost in excessive in pipeline.For long range water supply project, the quick closedown pole of afterbody valve
Direct hammer is also easy to produce, causes pipeline damage, but as valve was closed slowly, water outflow is more in pipeline, then does not have reduction
The effect of head end air tank volume.
For pipe arrangement gentle long range water supply project relatively, its pipeline is longer, and the inertia of water body is larger in pipeline,
Its pipeline arrangement gentle characteristic relatively causes water body flows backwards power small, after occurring termination of pumping accident, pipe end can flow out compared with
Many waters, and these waters need after pump in air tank water body to supplement, air tank does not allow again during operation
It is existing hollow, it is very big which results in air tank volume.Therefore, in theory by accelerating the speed that trunk pipeline flow slows down, i.e.,
The rate of water make-up of air tank can be reduced, the purpose for reducing air tank volume has been reached.Can be from the aspect of following two, one can
With the decline of air tank base pressure after acceleration pump, if but the decline of air tank base pressure is too fast after pump, and hump point can in pipeline
Negative pressure can occur；Secondly can accelerate the rising of pipeline terminal pressure, the malleation during this can accelerate trunk pipeline flow
Reducing speed, and the barotropic wave produced can make up and cause the suction wave of air tank water level decreasing after pump, slow down air after pump
The decline of water level in tank, effectively reduces air tank volume, meanwhile, the minimum pressure along pipeline also can obtain to be carried accordingly
It is high.Comparatively speaking, accelerate the rising of pipeline terminal pressure to be more feasible, can be realized by closing afterbody valve.But, it is long away from
Quick closedown from water supply project afterbody valve easily produces direct hammer, causes pipeline damage, but as valve was closed slowly, pipe
The water flowed out in road is more, then does not have the effect for reducing head end air tank volume.
It can be seen that, a kind of rational protecting water hammer scheme is designed, it is reduced head end air tank volume, and do not produce
Excessive internal water pressure, it has also become technical problem urgently to be resolved hurrily.
The content of the invention
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention, which provides one kind, can either reduce head end sky
Gas tank volume does not produce the reasonable protecting water hammer structure and method of excessive internal water pressure again, before satisfaction adjusts guarantor's control to require
Put, can effectively reduce the total measurement (volume) of head end air tank, cost saving.
Technical scheme：In order to solve the above technical problems, the protecting water hammer knot for the reduction air tank total measurement (volume) that the present invention is provided
Structure, including forebay, aqueduct and the discharge bay being sequentially connected, the aqueduct are installed close to one end of forebay
There are water pump and head end air tank, the aqueduct is provided with autocontrol valve, the automatic control close to one end of discharge bay
Tail end air tank is installed on the anterior aqueduct of valve processed.
Specifically, stem air tank is close to water pump, tail air tank close to end autocontrol valve, stem air tank
Volume is more than tail air tank volume.
It is in forebay and discharge bay present invention simultaneously provides a kind of protecting water hammer method for reducing air tank total measurement (volume)
Connect aqueduct before, and install successively on aqueduct water pump, head end air tank, aqueduct, tail air tank and
End autocontrol valve, closing and the head end air tank mutual security of the tail air tank mated ends autocontrol valve
The water hammer pressure of water-carriage system.
Specifically, aqueduct end autocontrol valve is received after Pump Failure signal, is closed automatically according to default
Rule quick closedown.
Specifically, stem air tank is close to water pump, tail air tank close to end autocontrol valve, stem air tank
Volume is more than tail air tank volume.
Specifically, the caliber of the connecting tube of tail air tank and aqueduct is less than the caliber of water-supply-pipe.Improve afterbody empty
The aperture hindrance function of gas tank.
Specifically, the Closing Law is, in the case where meeting system maximum pressure standard, to be closed and pass using linear
Close speed as quickly as possible.
The present invention theoretical foundation be：When pipeline is longer, the water for flowing out pipeline is larger, and these waters then need sky
Water body makes up in gas tank.Gas volume is changed greatly in air tank, and build needed for air tank cannot get good reduction, therefore,
The reducing speed of trunk pipeline flow should be accelerated in theory, rate of water make-up needed for making air tank reduces.Can be from the aspect of two, its
One can accelerate the decline of head end air tank base pressure, if but head end air tank base pressure declines too fast, hump in pipeline
Point is likely to occur negative pressure；Secondly can accelerate the rising of pipeline terminal pressure, its boosting ripple produced can effectively slow down head
The water level decreasing speed of air tank is held, so that the build of head end air tank is reduced, meanwhile, the minimum pressure along pipeline can also be obtained
To being correspondingly improved.And to improve pipe end pressure and can contemplate while occurring the loss of power accident, end valve receives letter
It is number automatic according to the rule quick closedown set, its barotropic wave produced is made up the suction wave of air tank water level decreasing.But
Due to duct length factor, if the closing of pipe end valve is too fast, the malleation produced in pipeline will be bigger than normal, can exceed that pipeline pressure
Power bears standard；And if valve closing in end is slower, water reduction is not obvious, and air tank build then can not effectively be dropped
It is low.Consider, the malleation wave apparatus produced by pipe end sets a buffering to close valve, make after pressure rises to a certain degree
Maintain, so as to avoid closing caused pressure problems of too by valve, while making pipe end pressure maintain a higher level
To aggravate the decay of pipe flow speed.Pipeline afterbody sets air tank to get good malleation protection effect.It is noted that pump power down
Afterwards, end valve receives the automatic quick closedown of signal, and pipeline water body flows to rapidly tail air tank, rises for increase pipeline pressure
Amplitude, can properly increase the impedance factor of protector, so that pipeline pressure when increasing pass valve, air tank base pressure is becoming
A higher level can be maintained during change.Therefore the elevated pressures of pipe end will accelerate the decay of water body momentum, so that
Reduce the moisturizing volume of head end air tank, and then reduce air tank build, afterbody valve Closing Law is maximum to meet system
Linear closing is used in the case of pressure criteria and closing velocity is as quickly as possible.
After generation termination of pumping accident, pressure is reduced after pump, the moisturizing into pipeline of head end air tank, produced by afterbody valve is closed
Malleation when being transferred to pipeline head end, pressure rise after pump, the speed of water body outflow head end air tank slows down；Simultaneously because setting
Tail air tank, occurs after termination of pumping accident, and pressure is reduced after pump, the moisturizing into pipeline of head end air tank, and afterbody valve closes institute
When the malleation of generation is transferred to pipeline head end, pressure rise after pump, the speed of water body outflow head end air tank slows down；Simultaneously because
Tail air tank is set, occurred after termination of pumping accident, afterbody valve receives signal according to the automatic quick closedown of the rule set in advance,
Tail air pot bottom pressure rises rapidly, and water body enters in tank body, gas compression in tail air tank, has buffered pass valve generation
Water hammer pressure, it is to avoid the destruction of excessive malleation.The improvement side closed automatically using head and the tail arrangement air tank and with reference to end valve
Case so that air tank volume significantly reduces, and during Pump Failure pipeline along line pressure within control standard.
Below by by taking pipe arrangement relatively gentle long range water supply project as an example, illustrate head and the tail air tank safeguard procedures
Operation principle and effect.
When water-carriage system is normally run, manifold pressure is in poised state.When water pump draws water power-off operating mode, pump
Rotating speed, which declines rapidly, causes lift to drastically reduce, and pipeline pressure is reduced rapidly.Now water pump is stopped, in order to avoid due to
Water flow of pipeline is reduced and negative pressure occurs and cause pipeline damage after pump, and air tank is arranged generally behind water pump to avoid the hair of danger
It is raw.For the current in pipeline, because its pipeline is longer, the momentum of water body is larger in pipeline, during power-off operating mode of drawing water,
Water body still continues flow forward in the presence of inertia.Now pump has been stopped, and the water body in pipeline is all by air
Water body in tank is supplemented.When water delivery distance is longer, just need more water body to supplement, thus need larger air tank
Volume.
If accelerating the rate of decay of trunk pipeline flow in theory, rate of water make-up needed for just can making air tank reduces, you can
Reach the purpose for reducing air tank volume.The present invention is the rising from acceleration pipeline terminal pressure to consider.Pipe end pressure
Power, which rises the boosting ripple produced, can effectively slow down the water level decreasing speed of head end air tank, so as to reduce head end air tank
Volume, meanwhile, the minimum pressure along pipeline can be also correspondingly improved.In pipe end, one small air is set again
Tank, to buffer close valve produced by malleation, rise to pressure and maintain afterwards to a certain degree, at the same make pipe end pressure maintain
In a higher level to accelerate slowing down for pipe flow speed.Water volume flow rate slows down in pipeline so that the moisturizing body of head end air tank
Product reduces, so as to reduce air tank build.
Beneficial effect：The present invention in water-carriage system end autocontrol valve front end by setting the afterbody of small volume empty
Gas tank simultaneously combines the automatic closing of end autocontrol valve to reduce the volume of head end air tank.Efficiently solve pipeline cloth
The problem of air tank gas volume is excessive in relatively gentle long range water supply project is put, this is to waterline layout optimization and sky
The selection of gas tank, particularly long range water supply project relative to the air tank under gentle pipe arrangement mode bodily form optimization,
With very significant effect.
Except the technical problem of invention described above solution, the technical characteristic of composition technical scheme and by these skills
Outside the advantage that the technical characteristic of art scheme is brought, the protecting water hammer structure for reducing air tank total measurement (volume) of the invention and method institute
The advantage that the other technologies problem that can be solved, the other technical characteristics and these technical characteristics that include in technical scheme are brought,
It will be described in more detail with reference to accompanying drawing.
Brief description of the drawings
Fig. 1 arranges schematic diagram for the simulation water-carriage system of existing unshielded measure；
Fig. 2 is the simulation water-carriage system arrangement schematic diagram of arrangement air tank after existing pump；
Fig. 3 arranges schematic diagram for the simulation water-carriage system of the head and the tail arrangement air tank of the present invention；
Pressure changes over time tendency chart after flow and pump after pump when Fig. 4 is unshielded measure；
Fig. 5 is minimum pressure envelope diagram under three kinds of different arrangements；
Fig. 6 is that the lower head end air tank depth of water of two kinds of different arrangements changes over time tendency chart；
Fig. 7 is that the lower head end air tank base pressure of two kinds of different arrangements changes over time tendency chart；
Fig. 8 is the present invention head and the tail arrangement air tank embodiment tail air tank depth of water and base pressure variation diagram；
Marked in figure：Forebay 1, water pump 2, head end air tank 3, aqueduct 4, tail air tank 5, valve downstream
6, discharge bay 7.
Embodiment
The protecting water hammer scheme suitable for effectively reducing air tank total measurement (volume) long range water supply project of the present embodiment, such as
Shown in Fig. 3, head end air tank 3 is arranged after pump, relatively small air tank 5 is arranged in aqueduct end, when water pump is taken out
When water is powered off, the flow velocity of water body in pipeline is accelerated to subtract to increase the pressure of downstream line by compressed air cylinder gas volume
It is small, to reach the purpose for reducing head end air tank gas volume.
When water-carriage system is normally run, manifold pressure is in poised state.When water pump draws water power-off operating mode,
Revolution speed, which declines rapidly, causes lift to drastically reduce, and pipeline pressure is reduced rapidly.Now water pump is stopped, in order to avoid by
The pipeline damage for negative pressure occur and causing is reduced in water flow of pipeline after pump, air tank is arranged generally behind water pump to avoid danger
Generation.For the current in pipeline, because its pipeline is longer, the inertia of water body is larger in pipeline, power-off work of drawing water
During condition, water body continues flow forward in the presence of being still in inertia.Now pump has been stopped, and the water body after pump in pipeline is complete
Water body of the portion in air tank is supplemented.Need more water body to supplement when water delivery is apart from overlength, just need larger sky
Gas tank volume.
If accelerating the reducing speed of trunk pipeline flow in theory, rate of water make-up needed for just can making air tank reduces.This hair
Bright is to be considered from increase pipe end pressure with accelerating the decay of pipeline medium velocity.Pipe end pressure rises the liter produced
Pressure ripple can effectively slow down the water level decreasing speed of head end air tank, so as to reduce the build of head end air tank.Meanwhile, pipeline
Minimum pressure along the line can be also correspondingly improved.One small size air gas tank is set again in pipe end, to buffer pass valve
Produced malleation, rises to pressure and maintains afterwards to a certain degree, at the same make pipe end pressure maintain a higher level with
Accelerate slowing down for pipe flow speed.Pipeline afterbody sets air tank to get good malleation protection effect.When quick closedown end
After valve, pipeline water body flows to rapidly tail air tank, improves the water height in air tank, adds the pressure in air tank
Power.The increase of air tank base pressure, accelerates the decay of water volume flow rate in pipeline.When current stop flowing to tail water air tank
When, now water level reaches highest in tail air tank, and base pressure reaches maximum；Water level reaches minimum, bottom in head end air tank
Portion's pressure reaches minimum, in the presence of the pressure difference of both sides, and the water body in pipeline starts to flow backwards, on the water body of head end air tank starts
Rise, base pressure starts increase.When water level reaches highest in head end air tank, base pressure reaches maximum；In tail air tank
Water level reaches minimum, and base pressure reaches that the water body in minimum, pipeline starts flow further downstream again, so moves in circles, and accelerates
The decay of water fluctuation in pipeline.
Certain long distance water transfer project arrangement is as shown in figure 1, wherein water-carriage system is about 45km, design discharge
1.32m3/ s, pumps design lift 65m, its mesorelief lift 11.6m, overcome pipe friction lift 53.4m.It is required that aqueduct
Negative pressure is inside occurred without, maximum control pressure, negative pressure is occurred without as minimum pressure control using pipeline using 60m water hammer pressure as pipeline
Standard processed.
This example takes three kinds of different arrangements respectively, and arrangement one is the water-carriage system cloth of unshielded measure
Put, as shown in Figure 1；Arrangement two is the water-carriage system arrangement that head end arranges air tank, as shown in Figure 2.Arrangement three is
The water-carriage system arrangement of head and the tail arrangement air tank, as shown in Figure 3.Wherein, arrangement two and air tank in arrangement three
Shape parameter is as illustrated in chart 1.
1 two kinds of arrangement form air tank shape parameters of table
Research transient process is general based on numerical simulation at present, and the present embodiment was supplied water using more ripe long range
Transient software for calculation is simulated to the operating mode, is changed by studying SEA LEVEL VARIATION and air tank base pressure in air tank
Process, is further analysed to the invention in the active practicality for reducing air tank total measurement (volume).
By three kinds of different arrangements in this application example, i.e., arranged using unshielded measure, head end sets air
Three kinds of different arrangement forms of tank and head and the tail arrangement air tank are contrasted, and specific result of calculation is as shown in Fig. 4~Fig. 8.
Fig. 4 is pressure variation after flow after unshielded measure embodiment pump and pump, as shown in Figure 4, in termination of pumping accident hair
After life, flow and pressure constantly reduce after pump, and caused decompression ripple to produce more serious decompression along pipeline, most of pipeline
Pressure is down to below pressure for vaporization, to ensure water-carriage system safe operation, need to set safeguard procedures.Consider, in water delivery system
Safeguard procedures should be set in system, it is ensured that the safe operation of water-carriage system.
Fig. 5 is water-carriage system minimum pressure envelope diagram under three kinds of different arrangements, in the arrangement form of unshielded measure
Under, water-carriage system pipeline pressure is mostly in vapor pressure once, is unfavorable for the safe operation of water-carriage system.Set after pump empty
After gas tank, system major part pressure value rises to more than 0, is conducive to the safety of water-carriage system.Because water-carriage system pipeline is longer, pipe
Line arrangement is more gentle, and landform lift is relatively small, causes the flow rate of water flow in pipeline to be decayed slower, the water body in pipeline is just complete
Portion is provided by air tank, it is therefore desirable to which larger air tank volume is hollow to avoid air tank from occurring.Used as shown in figure 5, working as
During the arrangement of head and the tail air tank, the volume of air tank significantly reduces, now most of pressure of pipeline still 0 with
On, arrange that the mode protection effect of air tank is more excellent compared with head end.As can be seen from Table 1, when using head and the tail air tank arrangement
When, ensureing water-carriage system line pressure safety and on the premise of avoiding air tank hollow, the cumulative volume of head end air tank by
640.9m originally3It is down to 213.5m3, although now afterbody is also additionally arranged 81.6m3Air tank, but head and the tail arrangement air tank mode
Under air tank total measurement (volume) be 295.1m3, total measurement (volume) reduces 53.96%, saves the investment of engineering.
Fig. 6 is respectively that the lower head end air tank depth of water of two kinds of different arrangements and air tank base pressure are changed over time with Fig. 7
Tendency chart, it can be seen that although the arrangement form of head and the tail arrangement air tank reduces the volume of air tank, but air tank remains unchanged not
Have hollow, lowest water level is still above the mode that head end arranges air tank, and air tank base pressure is also higher than head end cloth and is empty
The form of gas tank.
As shown in figure 8, due to being additionally arranged tail air tank, after power-off operating mode of drawing water, the current one in aqueduct
Part flows to discharge bay, and another part flows into tail air tank, improves the water height in air tank, add in air tank
Pressure.The increase of air tank base pressure, accelerates the decay of water volume flow rate in pipeline.When current stop rearwardly air tank
During flowing, now water level reaches highest in tail air tank, and base pressure reaches maximum；Water level reaches most in head end air tank
Low, base pressure reaches minimum, in the presence of the pressure difference of both sides, and the water body in pipeline starts to flow backwards, the water body of head end air tank
Begin to ramp up, base pressure starts increase.When water level reaches highest in head end air tank, base pressure reaches maximum；Afterbody is empty
Water level reaches minimum in gas tank, and base pressure reaches that the water body in minimum, pipeline starts flow further downstream again, so circulates past
It is multiple.Due to the presence of tail air tank, the period of waves of system is shortened, the decay of system is accelerated, is conducive to water-carriage system
Safe operation.
Claims (4)
- Reduce the protecting water hammer structure of air tank total measurement (volume) 1. a kind of, including be sequentially connected forebay, aqueduct and go out Pond, the aqueduct is gentle long range water supply line, and the aqueduct is provided with close to the head end of forebay Water pump and head end air tank, the aqueduct are provided with end autocontrol valve, the end close to the end of discharge bay End air tank is installed on the anterior aqueduct of autocontrol valve.
- 2. a kind of protecting water hammer structure for reducing air tank total measurement (volume) according to claim 1, it is characterised in that：Head end is empty Gas tank is combined close to water pump, end air tank close to end autocontrol valve, end air tank with end autocontrol valve Action, volume needed for for reducing head end air tank.
- 3. a kind of protecting water hammer method for reducing air tank total measurement (volume), is with going out in gentle long range water supply project forebay Aqueduct is connected between pond, and water pump, head end air tank, end air tank and end are installed successively certainly on aqueduct Dynamic control valve, closing and the head end air tank mutual security water delivery system of the end air tank mated ends autocontrol valve The water hammer pressure of system；Aqueduct end autocontrol valve is received after Pump Failure signal, is advised automatically according to default close Restrain quick closedown；The Closing Law is, in the case where meeting system maximum pressure standard, to be closed and closing speed using linear Degree is as quickly as possible.
- 4. a kind of protecting water hammer method for reducing air tank total measurement (volume) according to claim 3, it is characterised in that：End is empty The caliber of the connecting tube of gas tank and aqueduct is less than the caliber of aqueduct, and hindrance function is played to the aperture of end air tank.
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| CN201610110923.1A CN105735421B (en) | 2016-02-29 | 2016-02-29 | Reduce the protecting water hammer structure and method of air tank total measurement (volume) |
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| CN201610110923.1A CN105735421B (en) | 2016-02-29 | 2016-02-29 | Reduce the protecting water hammer structure and method of air tank total measurement (volume) |
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| CN106499010B (en) * | 2016-12-06 | 2023-04-18 | 特技阀门集团有限公司 | Novel air tank structure for protection pump water supply system |
| CN107218470A (en) * | 2017-05-27 | 2017-09-29 | 河海大学 | For the novel airbag type protecting water hammer device in water supply line |
| CN107725959B (en) * | 2017-11-15 | 2019-09-20 | 中北大学 | A method of water hammer is prevented for coal mine |
| CN108561670A (en) * | 2018-06-22 | 2018-09-21 | 中国电建集团贵阳勘测设计研究院有限公司 | Water hammer protection system for gravity flow water delivery system |
| CN109356424A (en) * | 2018-11-08 | 2019-02-19 | 河海大学 | A kind of spherical air tank reducing air tank total measurement (volume) and surface area |
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| CN114482186B (en) * | 2021-12-31 | 2023-08-25 | 河海大学 | Water hammer protection structure and method for combined protection of double-communication-valve multi-impedance pressure regulating chamber |
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