CN105627018B - A kind of fluid damping device for tackling pipeline pressure mutation - Google Patents
A kind of fluid damping device for tackling pipeline pressure mutation Download PDFInfo
- Publication number
- CN105627018B CN105627018B CN201610116803.2A CN201610116803A CN105627018B CN 105627018 B CN105627018 B CN 105627018B CN 201610116803 A CN201610116803 A CN 201610116803A CN 105627018 B CN105627018 B CN 105627018B
- Authority
- CN
- China
- Prior art keywords
- casing
- upstream
- pressure
- fluid
- baton round
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- F16L55/05—Buffers therefor
-
- 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
- F16L55/043—Devices damping pulsations or vibrations in fluids specially adapted for protecting instruments from water hammer or vibrations
-
- 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
- F16L55/055—Valves therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a kind of fluid damping device for tackling pipeline pressure mutation, including：Casing, it is shaped as rotating about the axis one week revolving body formed by oval curve, both ends are coaxially provided with entry and exit and the attachment means for connecting upstream and downstream gas pipeline, inwall of the casing close to outlet, which is circumferentially evenly spaced, is distributed with some barrels for pointing to the outlet, the radian of barrel baton round consistent with the inwall of casing, surface is smooth, and activity is positioned in the inner chamber of casing and diameter is more than upstream and downstream gas pipeline diameter.The change that the present invention passes through circulation area and coefficient of partial resistance, extend the reaction time of downstream pressure mutation, to realize purpose that pressure is slowly adjusted, structure and principle are simple and clear, are easily installed and safeguard, are quick on the draw, regulation is rapid, influence of the upstream pressure mutation to downstream line instrument, equipment will be slowed down, the operation cost of enterprise is reduced, ensure safety and the even running of pipeline.
Description
Technical field
The present invention relates to a kind of fluid damping device, and in particular to a kind of fluid damping dress for tackling pipeline pressure mutation
Put.
Background technology
At present, gas is mainly transported by pipe network system, and during gas utilization, the natural gas of upstream passes through pipe
Net is transported to gas or large-scale user.Because natural gas is in the emergency case or upstream for supplying with occurring during gas transmission
For example the fluctuation of pipe natural gas pressure is caused when the regulation of the equipment such as valve, pressure regulator or damage, further result in flow velocity
Mutation, this instantaneous change produce vibrations to causing certain impact to equipment, instrument surface, can influenceed when serious
Equipment, the normal use of instrument, threaten the safe operation of gas pipeline, so should be avoided before important upstream device, instrument
Pressure and sudden change of flow speed, postpone the mutation time of pressure and flow velocity.
Slow down the situation of this pressure jump in engineering frequently with damping unit, damping unit is a kind of speed of no rigidity
Spend relationship type damping unit, including viscous fluid damping unit, magnetorheological fluid damp device, magneto-rheological grease damping unit etc..Resistance
Buddhist nun refer to hinder object relative motion and kinergety be converted into heat energy or other can with dissipation energy one kind act on.
In mechanical physics, the reduction of the energy of system --- damping vibration be not all caused by resistance, for mechanical oscillation, one
Kind is that the mechanical energy for making system because of frictional resistance heat reduces, and is converted into interior energy, frictional damping is named in this damping；Another kind is
System causes the vibrations of particle around, the energy of system is gradually radiate to surrounding, is changed into the energy of ripple, and this damping is named
Radiation damping.Chinese invention patent CN102562929A is related to a kind of Leak-free rotary fluid damping unit, utilizes Magnetic force tracting
Blade in damping unit rotates, and upon rotation of the blade, damping fluid flows through the little round tube hole on blade, and damping fluid is flowed through on blade
Little round tube hole when consume energy, play control vibration effect.Chinese invention patent CN104632989A provides a kind of high-performance
Fluid damping vibration isolator, the use of rigid rod is added, improve the bending stiffness of vibration isolation, improve performance and the application of vibration isolator
Scope.Chinese invention patent CN104776151A is related to a kind of device for preventing leakage of fluid damping device, the patent viscoplasticity
Material replaces conventional hermetic circle, and viscoelastic material is consolidated by vulcanizing treatment and piston rod and steel cylinder inwall, utilizes
Viscoelastic material detrusion effect is big, and tensile strength and tearing toughness are high, and ageing resistace is good, and it is strong to vulcanize setting capacity
The features such as, to make up the deficiency of conventional seals circle.
Gas Industry has no the damping unit for Fluid pressure and velocity jump at present, although above-mentioned damping unit exists
Requirement can be reached on regulating effect, but the structure of device is complex, and equipment manufacturing costs are higher, and difficulties in installation and maintenance is big,
Damping fluid leakage simultaneously will threaten to pipe safety and even running.So for the characteristic of natural gas line flowing, need
With reference to the principle of damping unit in engineering, the new novel damping device suitable for pipe natural gas is studied.
The content of the invention
The object of the present invention is to overcome the problems of the prior art, there is provided a kind of good, the governing speed of leak-proof energy
It hurry up, low energy consumption, easily manufacture, the pipeline fluid damping unit of easy care, quick and sensitive regulation upstream line pressure change is under
The influence of equipment is swum, ensures the normal operation of upstream device.
The present invention realizes that the technical scheme of above-mentioned purpose is：
A kind of fluid damping device for tackling pipeline pressure mutation, including：
Casing, it is shaped as rotating about the axis one week revolving body formed by oval curve, and both ends are coaxially provided with out, entered
Mouth and the attachment means for connecting upstream and downstream gas pipeline, inwall of the casing close to outlet are circumferentially evenly spaced
Some barrels for pointing to the outlet are distributed with, the radian of the barrel is consistent with the inwall of casing, and the barrel can be with case
Body by integral forming, it can also be directly welded on the inwall of casing；
Baton round, surface is smooth, and activity is positioned in the inner chamber of casing and diameter is more than upstream and downstream gas pipeline diameter.
The change of the upstream fluid flow state of this programme causes the change of baton round motion state, and then causes fluid to lead to
The circulation area of overdamp device changes, and changes the pressure that fluid leads to downstream, increases the reaction time of pressure jump, with
Realize the purpose that pressure is slowly adjusted.
Further, described attachment means include the upstream connection screw thread of connection tank inlet and connect tank outlet
Downstream connection screw thread, suitable for the less natural gas line of connection diameter.
Further, described attachment means include the upstream adpting flange of connection tank inlet and connect tank outlet
Downstream connection flange, suitable for the natural gas line that connection diameter is larger.
Further, be provided with the top curve surface of the casing motion state for observing baton round and position, by
This judges the form of the alkali-free alumina silicate glass material of upstream fluid motion state, convenient observation, while has Heat-resistant stable
Property and high mechanical strength, the impact of general pipeline impurity can be resisted, thermal coefficient of expansion is low, and softening temperature is high, stable chemical performance
The advantages that.
Further, it is provided with blowoff valve at the bottom curved surface of the casing, the blowoff valve can be small ball valve, volume
Small, simple in construction, favorable sealing property, present position is in casing lowest part, for regular discharge tube pollutant.
Further, the density of the baton round is consistent with natural gas density during pressure stability, so, when natural
When atmospheric pressure is in stable state, the motion state of baton round is also at stable state, i.e. inactive state, and baton round is in stress
Balance, baton round will be floated on the middle position of cabinets cavity by buoyancy, even if when pressure has fluctuation and moved, also can
It is as placed in the middle mobile as possible, realize that Flow Resistant Coefficient slowly changes.
Further, the baton round is the hollow ball using POM plastic, and pressure and upstream line day are filled with ball
The consistent natural gas fluid of right atmospheric pressure design pressure, POM plastic has high rigidity, high rigidity, the characteristic of high abrasion, by setting
The density for being empty the heart and the conveniently adjusted baton round of filled natural air-flow body is allowed to consistent with natural gas density during pressure stability,
And difficult deformation.
Further, the casing and barrel are 304 stainless steels, and it has good corrosion resistance, a heat resistance, and low temperature is strong
Degree and the hot-workability such as mechanical property, punching press, bending are good, are readily processible to the casing with radian and certain flexure plane, corrosion resistant
It is also high to lose intensity.
Further, 1.2~1.5 times of a diameter of natural gas line caliber of the baton round.
Further, the height of the barrel is the 1/10~1/6 of natural gas line caliber, and barrel sand for surface wheel is beaten
Mill, roughness determined by polishing intensity with depth, can according to the requirement of actual pipeline operating mode design roughness, barrel it is coarse
Degree and fluid passage section size (radian and height) together decide on the radian and height for the coefficient of partial resistance that fluid passes through
The coefficient of partial resistance of damping unit will be influenceed.
The present invention has following beneficial effect compared with prior art：
1st, it is simple in construction, it is easy to maintain；This fluid damping device is only total to by form, blowoff valve, casing, baton round and barrel
5 parts form, and manufacturing process is simple, and material is readily available, and it is convenient to fill unloading process.Polluted in use in pipeline
Thing can be excluded in time by sewage draining exit, and motion state and position can be fed back in time by form in spheroid, can determine whether pipe
The motion state of fluid in road.
2nd, regulation is rapid, high sensitivity；Baton round remains static in upstream fluid steady flow, and now fluid leads to
The coefficient of partial resistance very little crossed, it can be neglected；When upstream fluid pressure is undergone mutation, baton round is according to the injustice of stress
Motion of the weighing apparatus by rapid generation forward or backward, because the difference of baton round motion state and position determines that fluid passes through this
The difference of damping unit coefficient of partial resistance, the pressure of downstream fluid is caused slowly to change, baton round returns again after about 3~5S
To poised state, now upstream is substantially convergent with fluid pressure downstream, effectively slows down influence of the upstream pressure change to downstream,
Automatically adjusting for manifold pressure is realized while not increasing foreign electron equipment.
3rd, operating flexibility is big, and security and stability is high；The principle of the invention is simple, and damping dress can be designed according to requirement of actual working condition
Size is put, processing effectively is adjusted for each operating mode, does not introduce other exogenous impurities, seal degree is high, it is ensured that pipeline
The unicity of fluid and steady flow, while the baton round in damping unit may act as the effect of check-valves, effective anti-fluid stopping
Body flows back, and ensures the safety of conduit running.
Brief description of the drawings
Fig. 1 is the fluid damping apparatus structure schematic diagram that a kind of reply pipeline pressure of the embodiment of the present invention is mutated.
Fig. 2 is the force analysis of baton round and fluid flow state signal when natural gas upstream is in steady flow condition
Figure.
Baton round motion state schematic diagram when Fig. 3 is natural gas upstream pressure jump.
Fig. 4 is baton round motion state schematic diagram when natural gas upstream pressure jump is excessive.
Baton round motion state schematic diagram when Fig. 5 is natural gas upstream pressure anticlimax.
Fig. 6 is baton round motion state schematic diagram when natural gas upstream pressure anticlimax is excessive.
Fig. 7 is that a kind of fluid damping plant bulk for tackling pipeline pressure mutation marks schematic diagram.
Fig. 8 is that A-A marks schematic diagram to section size in Fig. 7.
It is shown in figure：1- upstreams adpting flange；2- forms；3- blowoff valves；4- casings；5- baton rounds；6- barrels；Under 7-
Swim adpting flange.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with accompanying drawing, to the present invention
Technical scheme carry out clear, complete description, but the implementation of the present invention is not limited to this.
As shown in figure 1, it is a kind of tackle pipeline pressure mutation fluid damping device, including form 2, blowoff valve 3, casing 4,
Baton round 5, barrel 6, being shaped as of casing 4 rotate about the axis one week revolving body formed by oval curve, and both ends are coaxially set
There are entry and exit and upstream adpting flange 1 and downstream connection flange 7 for connecting upstream and downstream gas pipeline, the casing 4 to lean on
The inwall closely exported, which is circumferentially evenly spaced, is distributed with some barrels 6 for pointing to the outlet, the radian and case of the barrel 6
The inwall of body 4 is consistent, and the barrel 6 can be integrally formed with casing 4, can also be directly welded on the inwall of casing 4；Plastics
The surface of ball 5 is smooth, and activity is positioned in the inner chamber of casing 4 and diameter is more than upstream and downstream gas pipeline diameter.
The upstream adpting flange 1 and downstream connection flange 7 will connect the pipeline of upstream and downstream, according to actual work during use
The situation selection threaded connection or flange connection of condition, when designed gas pipeline caliber is smaller, pressure is relatively low, typically use spiral shell
Line connects.Often connected when caliber is larger, pressure is higher with flange, typically from slip-on welding flange.The both ends of casing 4 and upstream and under
Play pipe road is respectively provided with two the first sealing rings and the second sealing ring for possessing sealing function, to prevent damping unit gas leakage.Simultaneously
Mozzle is provided with the closed cavity among two sealing rings, mozzle can be connected with inert fluid gas cylinder, for past damping
Impurity inside device purge.
The form 2 is arranged at the top curve surface of the casing 4, using alkali-free alumina silicate glass, thickness 12mm,
Pressure-resistant scope between 1~30MPa, its position can in gross examination of skeletal muscle damping unit baton round 5 motion conditions, and then quickly sentence
The pressure changing of disconnected upstream gas.
The blowoff valve 3 is arranged at the bottom curved surface of the casing 4, can regularly exclude the pollutant in damping unit,
Ensure that barrel surface roughness is constant.
The material of casing 4 is 304 stainless steels, and inner surface is smooth, and the height and radian of casing will influence fluid circulation resistance
The coefficient of partial resistance of Buddhist nun's device, casing specification can be designed according to pipeline actual condition.
The baton round 5 is the hollow ball using POM plastic, and pressure and upstream line gas pressure are filled with ball
The consistent natural gas fluid of design pressure, density is consistent with natural gas density during pressure stability, baton round 5 it is a diameter of natural
1.2~1.5 times of feed channel caliber, surface is smooth, so fluid and baton round 5 be almost without the effect of frictional force, i.e., without pressure
Power is lost.Moving forward and backward for baton round 5 will determine flow area size of the gas by damping unit, when upstream fluid stationary flow
When dynamic, baton round is floated in the air, and because stress balance will remain static, as shown in Figure 2 by fluid buoyancy effect；When
Baton round moves forward, i.e., toward downstream movement when, as shown in figure 3, actual internal area diminishes, droop loss will increase；On if
Trip pressure change is too fast, and baton round arrives the exit of damping unit by pushing up, as shown in figure 4, the now coefficient of partial resistance of fluid
It is maximum.When upstream fluid pressure becomes small suddenly, baton round will move backward, as shown in Figure 5.When upstream fluid pressure is too low
Downstream fluid will be caused to flow back, because the diameter of baton round 5 is bigger than pipe diameter, so now baton round can be stuck in damping unit and enter
At mouthful, as shown in fig. 6, now baton round serves as the effect of check-valves, ensure the safety and other pipelines of upstream line equipment
Safety gas.
The material of barrel 6 is 304 stainless steels, and its surface roughness determines the pressure loss of the fluid by damping unit,
Roughness is determined by the intensity polished with depth, roughness can be designed according to the requirement of actual pipeline operating mode, and then change stream
Body is by the coefficient of partial resistance of damping unit, while the radian of barrel and height will also influence the local resistance system of damping unit
Number, the more big then resistance coefficient of radian is bigger, and barrel is highly designed as between the 1/10~1/6 of natural gas line caliber.
The present embodiment is mutated the shadow to upstream device, device and safety gas to current natural gas line upstream pressure
Ring, design the device of a fluid damping, influence of the upstream pressure mutation to downstream can be quickly tackled, when extending pressure change
Between, its concrete operating principle and process are as follows：
According to the changing condition of gas pressure, fluid pressure condition can be divided into stable state, pressure jump state,
Pressure anticlimax state.
(1) stable state
When natural gas upstream pressure is in stable state, the motion state of baton round 5 is also at stable state, i.e., static
State, baton round 5 are in stress balance.Baton round 5 will be floated in the air by buoyancy, due to the lighter weight of baton round 5, erect
The upward gravity of Nogata can cancel each other with buoyancy, and the present apparatus mainly considers horizontal active force.Because the presence of baton round 5 causes
Fluid flow area changes, and circulation area reduces suddenly when fluid flows through 5 end of baton round, and flow through baton round 5 it
Circulation area expands again suddenly afterwards, fluid is locally done pressure vortex flow, forms local eddy currents, in the presence of barrel 6, this
Individual vortex can further increase intensity, and be vortexed respectively is having a vortical force up and down, and this vortical force opposite direction acts on baton round 5
On, cancelled out each other with the cumulative thrust so as to upstream fluid of static pressure of downstream fluid, so in upstream fluid flow state
A force balance state be present when stable, i.e., now baton round 5 remains static, as shown in Figure 2.
Understand when fluid flows through solid wall surface, in addition to the serious a thin layer of near wall viscous effects, remaining region
Flowing can be considered the irrotational motion of perfect fluid, i.e. circulating-area, and vortex point is then vortex core area.
It is assumed to be Steady Flow state, the pressure distribution that circulating-area fluid can be obtained with Lagrange integration is：
The pressure distribution of vortex fluid can be obtained using the Eulerian motion differential equation：
It is P2 pressure values corresponding at diagram vertical bold lines section.
(2) pressure jump state
When natural gas upstream pressure increases suddenly, 5 original poised state of baton round will be broken, and be pushed away in upstream fluid
Power effect lower moment moves forward, as shown in figure 3, fluid will be past with baton round 5 by the coefficient of partial resistance of damping unit
It is preceding motion and incrementally increase, in turn result in droop loss increase, downstream charge amplitude will be more much smaller than upstream plenum amplitude, with reality
Now slowly adjust the effect of fluid pressure downstream.But if mutational range has exceeded scope of design, then baton round will be pushed up directly
Damping unit lower exit, as shown in figure 4, coefficient of partial resistance is certain, i.e., pressure drop effect determines, so damping unit regulation effect
Fruit is by unobvious.Now because barrel is in casing the characteristics of Disjunct distribution, as shown in fig. 7, so upstream fluid can still pass through
Barrel gap flows into downstream line, and meet downstream line uses gas requirement, and gap circulation area is determined by θ.Baton round is forward
After moving a period of time, due to the effect of vortical force and the static pressure of downstream fluid, baton round 5 will be moved gradually backward,
This process medium fluid resistance coefficient slowly diminishes, and causing downstream pressure, slowly upstream pressure is close, and final baton round 5 will weight
A stable state newly is returned to, upstream pressure is approximately equal to fluid pressure downstream.It is different for a designed damping unit
Voltage drop value can difference when mutation pressure is finally reached stable.
(3) pressure anticlimax state
When natural gas upstream pressure reduces suddenly, 5 original poised state of baton round will be also broken, and be that pressure is unexpected
The inverse process of increase, moved backward under upstream fluid thrust, as shown in figure 5, the part that fluid passes through damping unit
Resistance coefficient will be moved forward with baton round 5 and progressively increase it is small, in turn result in droop loss reduction, now baton round 5 will reach
To new stress balance,.But if mutation value has exceeded scope of design, then baton round 5 enters on direct top to damping unit upstream
Mouthful, as shown in fig. 6, now damping unit prevents downstream fluid from flowing backwards, ensures upstream line equipment equivalent to the effect of check-valves
With the safety of supply.
A kind of course of work for the fluid damping device for tackling pipeline pressure mutation is made into one with reference to specific example
Step description：Gas pressure P1 is 4.0bar, mass flow about 1000kg/h, gas flow rate V1 about 15m/ during certain voltage regulating station stable state
S, pipe diameter D1 are 80mm, and quality of natural gas flow is certain in pipeline, but gas pressure and flow velocity have change.According to the work
Condition design damping unit raising middle flask body length L be 190mm, and plastics bulb diameter D2 is 100mm, pressure and pipeline stable state in baton round 5
When it is consistent, damping unit maximum caliber (D2+2R) is 160mm, and barrel is divided into 8 pieces uniformly on the surface of cabinet wall, θ
Angle is 22.5 °, and height ((d1-d2)/2) is 10mm, and radian about α is=20 °.
1st, the motion state of baton round 5 and the analysis of gas drag losses when natural gas upstream is in steady flow condition
When natural gas upstream pressure is in stable state, i.e. when pressure P1 is 4.0bar, the motion state of baton round 5
In stable state, baton round 5 will be floated in the air by buoyancy, and gravity can cancel each other with buoyancy in vertical direction, this
Invention is main to consider transverse movement, and the pressure of vortical force and circulating-area suffered by baton round 5, downstream hydrostatic pressures power P3 will be offset
Upstream gas is in stress balance, i.e. inactive state to the thrust of baton round, now baton round 5, as shown in Figure 2.
Force analysis is during balance：
P1S1+P1cos45 ° of S2=P3S3+ (the cos45 ° of+P rotation of P rings) S ring
By
Substitution condition can solve the now center of baton round 5 and at the 155mm of damping unit diameter of section, that is, work as upstream line
When gas pressure is in stable state, it is the position at 155mm that baton round 5, which rests on vertical red diameter of section,.
Mach number is the dimensionless group of a sign flow field compressibility size, is a weight in high-speed aerodynamics
Basic physical parameters are wanted, reflect the similarity criterion of flow field compressibility size, are often used to divide the type of flow of fluid：
By V=15m/s, natural gas adiabatic coefficent k=1.31, R=287.1J/kgK, T=288.15K, then
M=0.046<0.5
So pipe natural gas is incompressible fluid in the design.
It can then be obtained according to fluid continuity equation and Bernoulli equation：
(1) P1 to P2 process, by local pipe resistance
V1A1=V2A2
W is the combustion gas average speed of conduit section, and approximation can be taken as V1
ζ 1 is the summation of coefficient of partial resistance in run of designing, now copies elbow bend according to Gas Pipeline Design specification
Coefficient of partial resistance value is 1.1.
(2) P2 to P3 process, by local pipe resistance
V2A2=V3A3
W is the combustion gas average speed of conduit section, and approximation can be taken as V2
ζ 2 is the summation of coefficient of partial resistance in run of designing, now copies stop valve office according to Gas Pipeline Design specification
Portion's resistance coefficient value is 11.0.
Above-mentioned condition is substituted into calculate：
The maximum cross-section of baton round 5 is in damping unit interior diameter when being 150mm, realizes stress balance, now：
V1=15.0m/s P1=4.0bar,
V2=8.63m/s P2=3.99bar,
V3=15.0m/s P3=3.98bar,
Natural gas is 0.02bar by the pressure drop of the damping unit when i.e. natural gas is in stable state, and approximation is ignored.
2nd, the motion state of baton round 5 and the analysis of gas drag losses during natural gas upstream pressure jump
When Fluid pressure increases suddenly, because mass flow and pipe diameter are constant, so flow velocity will reduce.Assuming that this
When Fluid pressure P1 increase to 6bar suddenly, now corresponding V1=11.14m/s, the stress when body of baton round 5 is in stable state are put down
Weighing apparatus will be broken, and baton round 5 is promoted by natural gas and travelled forward, as shown in Figure 3 so that the circulating face of gas stream overdamp device
Product is less and less, and the bigger pressure drop i.e. now of corresponding fluid resistance is bigger, is computed obtaining now baton round 5 and will at most be pushed away
It is preceding to plastics ball center to be in damping unit diameter of section be 120mm when, i.e., the diameter of section at vertical bold lines is 120mm.
Because the process is dynamic changing process, three static points when desirable baton round travels forward are as calculating mould
Type, dynamic process is simulated by multiple static points, when to take the diameter of section at vertical bold lines be 130mm, 125mm and 120mm, counted
Calculate the pressure value of now corresponding gas downstream.
When diameter of section at vertical bold lines is 130mm,
It can then be obtained by continuity equation and Bernoulli equation：
(1) P1 to P2 process, by local pipe resistance
V1A1=V2A2
W is the combustion gas average speed of conduit section, and approximation can be taken as V1
ζ 1 is the summation of coefficient of partial resistance in run of designing, and now gas is hindered by elbow bend and the local of barrel
Power, then it is 3.0 to copy elbow bend and stop valve coefficient of partial resistance value according to Gas Pipeline Design specification；
(2) P2 to P3 process, by local pipe resistance
V2A2=V3A3
W is the combustion gas average speed of conduit section, and approximation can be taken as V2
ζ 2 is the summation of coefficient of partial resistance in run of designing, now copies stop valve office according to Gas Pipeline Design specification
Portion's resistance coefficient value is 25.0
Above-mentioned condition is substituted into calculate：
V1=11.14m/s P1=6.0bar,
V2=15.85m/s P2=5.98bar,
V3=11.14m/s P3=5.84bar,
The pressure drop that natural gas passes through the damping unit when i.e. natural gas is in load condition is 0.16bar, it is specified that damping system
Number is f=P1/P3 × 10=10.27.
Table 1 can similarly be obtained
Understand, as baton round 5 travels forward, resistance of the natural gas flow through damping unit is bigger, and i.e. pressure drop is bigger, gained
Damped coefficient it is also bigger.Afterwards because the effect of vortical force and the static pressure of downstream fluid, baton round will be transported gradually backward
It is dynamic, reach force balance state again, thus complete to delay the overall process of disturbances, slack time is through fluid simulation meter
Calculation is about 4S when can obtain.
3rd, baton round motion state and the analysis of gas drag losses when natural gas upstream pressure jump is too fast
When the increase of natural gas upstream pressure is excessive, baton round will directly withstand on damping unit under upstream gas thrust
At lower exit, as shown in figure 4, now natural gas circulation damping unit when the resistance that is subject to it is maximum, i.e. pressure drop effect is most obvious,
It is 11.0 and 35.0 that ζ 1 and ζ 2, which distinguishes value, a diameter of 115mm of corresponding thick line vertical cross-section.Assuming that now Fluid pressure P1 increases
To 7.0bar, now corresponding V1=9.74m/s, then can be obtained by continuity equation and Bernoulli equation：
V2=38.69m/s P2=5.93bar,
V3=9.74m/s P3=5.57bar,
Natural gas is 1.43bar by the pressure drop of the damping unit when i.e. natural gas is in load condition, corresponding damping
Coefficient is f=P1/P3=12.57.
The effect that now damping unit delays Rus to change is most strong, afterwards due to vortical force and downstream fluid
The effect of static pressure, baton round 5 will be moved gradually backward, and Flow Resistant Coefficient slowly diminishes in this process, causes downstream
Slowly upstream pressure is close for pressure, and final baton round 5 will come back to a stable state, and upstream pressure is approximately equal to downstream
Fluid pressure.
4th, the motion state of baton round 5 and the analysis of gas drag losses during natural gas upstream pressure anticlimax
When original place is when gas pressure reduces suddenly in stable state pipeline, the stress balance shape of original baton round 5 will be broken
State, baton round 5 will move backward, as shown in figure 5, the resistance of damping unit suffered by corresponding baton round 5 will also reduce, now plastics
Ball reaches a new stress balance again, slows down the speed that downstream gas pressure diminishes.The process is above-mentioned upstream gas pressure
The inverse process that power is uprushed, regulating effect and time are close.
When pressure anticlimax value has exceeded scope of design, then baton round 5 will directly push up damping unit upstream inlet, such as Fig. 6
Shown, now damping unit prevents downstream fluid from flowing backwards, ensures upstream line equipment and supply equivalent to the effect of check-valves
Safety.It can be calculated when pressure is reduced more than 1.0bar, baton round 5 arrives automatic top the upstream inlet of damping unit.
In summary, the damping unit of this reply conduit fluid pressure mutation can be stablized in rational design pressure
And efficient operation.When upstream line design pressure is 4.0bar, if upstream line gas pressure becomes in 3.0~6.0bar
When dynamic, by the back and forth movement of baton round 5, can be achieved the purpose of slowly regulation downstream gas pressure, regulating time 3~5S it
Between.When upstream pressure fluctuations are more than 6.0bar, because damping unit length L is certain, so causing baton round 5 to withstand on downstream
Exit, pressure regulating effect is deteriorated, it could even be possible to making the ability that baton round 5 loses back and forth movement.Work as upstream pressure fluctuations
During less than 3.0bar, downstream fluid will be flowed back, and baton round 5 is withstood at the upstream inlet of device, and now baton round 5 serves as
The effect of pipe line check valve, ensure stable operation and the supply safety of upstream equipment.
The above embodiment of the present invention is only intended to clearly illustrate example of the present invention, and is not to the present invention
Embodiment restriction.For those of ordinary skill in the field, can also make on the basis of the above description
Other various forms of changes or variation.There is no necessity and possibility to exhaust all the enbodiments.It is all the present invention
All any modification, equivalent and improvement made within spirit and principle etc., should be included in the protection of the claims in the present invention
Within the scope of.
Claims (9)
- A kind of 1. fluid damping device for tackling pipeline pressure mutation, it is characterised in that including：Casing (4), it is shaped as rotating about the axis one week revolving body formed by oval curve, and both ends are coaxially provided with out, entered Mouthful and for connecting the attachment means of upstream and downstream gas pipeline, the casing (4) close to outlet inwall circumferentially equably between Every some barrels (6) for pointing to the outlet are distributed with, the radian of the barrel (6) is consistent with the inwall of casing (4)；Baton round (5), surface is smooth, and activity is positioned in the inner chamber of casing (4) and diameter is straight more than upstream and downstream gas pipeline Footpath；The density of the baton round (5) is consistent with natural gas density during pressure stability.
- 2. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：Described connection Device includes the upstream connection screw thread of connection casing (4) entrance and the downstream connection screw thread of connection casing (4) outlet.
- 3. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：Described connection Device includes the upstream adpting flange of connection casing (4) entrance and the downstream connection flange of connection casing (4) outlet.
- 4. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The casing (4) motion state for observing baton round and position are provided with top curve surface, thus judges upstream fluid motion state Alkali-free alumina silicate glass material form (2).
- 5. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The casing (4) blowoff valve (3) is provided with bottom curved surface.
- 6. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The baton round (5) for using the hollow ball of POM plastic, the interior day consistent with upstream line gas pressure design pressure filled with pressure of ball Right air-flow body.
- 7. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The casing (4) and barrel (6) is 304 stainless steels.
- 8. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The baton round (5) 1.2 ~ 1.5 times of a diameter of natural gas line caliber.
- 9. the fluid damping device of reply pipeline pressure mutation according to claim 1, it is characterised in that：The barrel (6) height is the 1/10 ~ 1/6 of natural gas line caliber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610116803.2A CN105627018B (en) | 2016-02-29 | 2016-02-29 | A kind of fluid damping device for tackling pipeline pressure mutation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610116803.2A CN105627018B (en) | 2016-02-29 | 2016-02-29 | A kind of fluid damping device for tackling pipeline pressure mutation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105627018A CN105627018A (en) | 2016-06-01 |
| CN105627018B true CN105627018B (en) | 2018-01-05 |
Family
ID=56042207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610116803.2A Active CN105627018B (en) | 2016-02-29 | 2016-02-29 | A kind of fluid damping device for tackling pipeline pressure mutation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105627018B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106763957B (en) * | 2016-11-21 | 2023-02-10 | 肖蕾 | Additional pressure head compensation device and compensation method for gas pipeline vertical pipe |
| CN106523842B (en) * | 2016-12-01 | 2019-04-09 | 深圳市燃气集团股份有限公司 | A kind of spring damping device of reply pipeline pressure mutation |
| CN108180343B (en) * | 2018-01-19 | 2023-10-13 | 华南理工大学 | Novel fluid damping device for coping with abrupt pressure change |
| CN108204245B (en) * | 2018-01-23 | 2021-05-04 | 深圳市燃气集团股份有限公司 | Natural gas pipe network pressure recovery method and device |
| CN108167649A (en) * | 2018-01-23 | 2018-06-15 | 深圳市燃气集团股份有限公司 | A kind of temperature and pressure balancing device applied to pressure energy of natural gas power generation process |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08145236A (en) * | 1994-11-25 | 1996-06-07 | Nok Corp | Counterpressure pressure damping valve |
| FR2847648A1 (en) * | 2002-11-27 | 2004-05-28 | Patrick Busson | Relief valve for releasing air from water pipes under pressure has chamber with upper and lower cones with seal and spacers respectively for spherical float |
| DE102010045352A1 (en) * | 2010-09-14 | 2012-03-15 | Daniel Ackermann | Setback device for preventing sudden pressure relief of the pressurized compressed air from hoses, has ball that is pressed against positioning pins in flow of air from air inlet to air outlet |
| CN202599010U (en) * | 2012-05-30 | 2012-12-12 | 中国海诚工程科技股份有限公司 | Primary pump circulating control system for ice water preparation |
| CN203671046U (en) * | 2013-11-06 | 2014-06-25 | 福建工航新型管业有限公司 | Silencing type PVC drainage pipe structure |
| CN205402075U (en) * | 2016-02-29 | 2016-07-27 | 华南理工大学 | Fluid damping device of reply pipeline pressure sudden change |
-
2016
- 2016-02-29 CN CN201610116803.2A patent/CN105627018B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN105627018A (en) | 2016-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105627018B (en) | A kind of fluid damping device for tackling pipeline pressure mutation | |
| CN109163101B (en) | Implementation method for improving exhaust capacity of air inlet and exhaust valve | |
| CN108695004B (en) | Waterpower buffer structure for the passive shutdown experimental provision of hydraulic suspension type | |
| CN205402075U (en) | Fluid damping device of reply pipeline pressure sudden change | |
| CN106523842A (en) | New spring damping device for coping with pipeline pressure jump | |
| Wei et al. | Experimental study on a hybrid vortex reducer system in reducing the pressure drop in a rotating cavity with radial inflow | |
| Fan et al. | Experimental and numerical investigation of a new method for protecting bends from erosion in gas-particle flows | |
| Zhang et al. | Numerical simulation of hydraulic characteristics of cyclical slit flow with moving boundary of tube-contained raw materials pipelines hydraulic transportation | |
| Shukla et al. | Investigation of transient chill down phenomena in tubes using liquid nitrogen | |
| CN107479585B (en) | Critical flow venturi nozzle based on mechanical choking principle | |
| CN108180343B (en) | Novel fluid damping device for coping with abrupt pressure change | |
| Liu et al. | Study on particles distribution characteristics through a circulation fluidized bed with the spiral flow generator | |
| Jin et al. | Numerical simulation and experimental study on internal depressurization flow characteristics of a multi-layer sleeve regulating valve | |
| CN208011138U (en) | A kind of fluid damping device of novel answering pressure mutation | |
| Zhang et al. | Study on the Influence of Pipeline Characteristics on Water Hammer Pressure of Gate Valve and Optimization of Protection Scheme | |
| CN219328216U (en) | Resistance-reducing synergistic medium-deep geothermal coaxial double-pipe heat exchanger | |
| Ripken | Design studies for a closed-jet water tunnel | |
| Mu et al. | RESEARCH ON THE FLOW DRAG CHARACTERISTICS OF SPHERICAL FUEL ELEMENT IN A CYLINDRICAL PIPE | |
| CN207674018U (en) | A kind of reducing snake bend differential pressure compensator | |
| Shangguan et al. | An Optimum Solutions for Venturi Used for Main Feedwater Flowrate Measurement in Nuclear Power Plant | |
| Frega et al. | Water hammer in water distribution system | |
| Tang et al. | Experimental investigations on characteristics of water-air two-phase flows during water-fillings in undulation pipelines | |
| Ting et al. | Research on flowrate characteristics of turbine By-pass System | |
| CN208420071U (en) | A kind of fluid flow rate measurement apparatus of super-wide range | |
| Liu et al. | Study on flow-induced vibration of self-regulation check valve during opening |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211101 Address after: 511453 No. 120, Qinlong street, Dongyong Town, Nansha District, Guangzhou City, Guangdong Province Patentee after: Guangdong Guangda New Energy Technology Co.,Ltd. Address before: 510640 No. five, 381 mountain road, Guangzhou, Guangdong, Tianhe District Patentee before: SOUTH CHINA University OF TECHNOLOGY |