CN208817102U - Feedwater piping and its leakage loss monitoring device - Google Patents
Feedwater piping and its leakage loss monitoring device Download PDFInfo
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- CN208817102U CN208817102U CN201821361833.0U CN201821361833U CN208817102U CN 208817102 U CN208817102 U CN 208817102U CN 201821361833 U CN201821361833 U CN 201821361833U CN 208817102 U CN208817102 U CN 208817102U
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Abstract
The utility model relates to a kind of feedwater piping leakage loss monitoring devices, including the annular outer protection tube part for being sleeved on feedwater piping, outer protection tube part has leakage loss monitoring inner cavity, water swelling rubber and the distribution type fiber-optic in water swelling rubber are equipped in leakage loss monitoring inner cavity, distribution type fiber-optic both ends are pierced by outer protection tube part respectively.In addition the feedwater piping for being configured with the feedwater piping leakage loss monitoring device is also provided.When feedwater piping is missed, rapid water-filling in the leakage loss monitoring inner cavity of outer protection tube part, it is squeezed after water swelling rubber water swelling flush-mounted in its internal distribution type fiber-optic, distribution type fiber-optic is set to generate biggish strain, and then occur that the incident light in optical fiber after position generates to Rayleigh scattering light in strain, abnormal backward Rayleigh scattering can be identified positioned at the distribution type fiber-optic (FBG) demodulator of monitoring center, and the position that leakage occurs is determined according to light propagation time in a fiber and spread speed, play the role of leakage alarm and positioning.
Description
Technical field
The utility model belongs to water supply network technical field, and in particular to a kind of feedwater piping leakage loss monitoring device and configuration
There is the feedwater piping of the feedwater piping leakage loss monitoring device.
Background technique
China's water supply network leak rate can not have always been high any more, according to the correlation study of urban water supply association, China in recent years
The water supply network leak rate that is averaged in main cities is about 18%, because annual loss fluid loss caused by public supply mains leakage is more than 6,000,000,000
m3." the water prevention and cure of pollution action plan " that State Council issues in April, 2015 has been made to want as follows to the leak rate of water supply network
Ask: to the year two thousand twenty, the average leak rate of national public water supply pipe network should be controlled within 10%.
The method that feedwater piping leakage is repaired mainly has two class of trenchless rehabilitation and non-excavation rehabilitation, and both methods belongs to
Passive restorative procedure, time-consuming, road pavement influences greatly, and is to be unfolded on the basis of having determined leak position, and give
The positioning of waterpipe leak source is the work taken time and effort.That there are positioning accuracies is low for currently used pipe leak detection technique,
Disturbing factor is difficult to the defects of removing, and the water supply network leak hunting method that the various regions system of appointing national minority hereditary headmen in the Yuan, Ming and Qing Dynasties generallys use is manually to listen leakage method, leak detector
Device includes electronic leakage measuring instrument by sonic, listens clave etc., using above-mentioned instrument detection leak source not only low efficiency, can not adapt to the huge confession in city
Water pipe net system, and it is i.e. enabled find leak position, generally also want several weeks to leak source is found from leakage occurs even several months
Time, leak source is leaking always during this period, this not only causes very big waste, also can generate punching to surrounding road basis
Brush, influences roadbed safety.
Utility model content
The utility model embodiment is related to a kind of feedwater piping leakage loss monitoring device and configured with feedwater piping leakage prison
The feedwater piping for surveying device, can at least solve the segmental defect of the prior art.
The utility model embodiment is related to a kind of feedwater piping leakage loss monitoring device, including annular outer protection tube part, described outer
The leakage that pillar part has the inner ring that can be sleeved on feedwater piping opening installation end and is connected to inner ring opening installation end
Monitoring inner cavity is lost, water swelling rubber is equipped in Yu Suoshu leakage loss monitoring inner cavity and in the water swelling rubber
Distribution type fiber-optic, the distribution type fiber-optic both ends are pierced by the outer protection tube part respectively.
As one of embodiment, the maximum swelling volume of the water swelling rubber is greater than the body of the leakage loss monitoring inner cavity
Product.
As one of embodiment, the water swelling rubber is vulcanization type expanded rubber.
As one of embodiment, the outer protection tube part includes two semi-ring tube bodies, and the two semi-ring tube body splicings are fixed simultaneously
It encloses and sets to form the leakage loss monitoring inner cavity.
As one of embodiment, two semi-ring tube body stitching portions are folded with silicagel pad.
As one of embodiment, the distribution type fiber-optic is arranged with flexible shroud, and it is located at except the outer protection tube part
Fiber segment be also arranged with rigid sheath, the rigid sheath is sheathed on except the flexible shroud.
As one of embodiment, the distribution type fiber-optic wears place's encapsulation process on the outer protection tube part.
The utility model embodiment is related to a kind of feedwater piping, including pipeline body, and the pipeline body is at least partly
Pipeline section is equipped with feedwater piping leakage loss monitoring device as described above, and the outer protection tube part is set in the pipeline section of corresponding position
On.
As one of embodiment, until less than the outer protection tube part is set at the connecting portion of the pipeline body.
As one of embodiment, multiple monitoring groups are disposed in the pipeline body, each monitoring group is along the pipeline
Ontology difference degree of filling position is sequentially arranged, and each above-mentioned monitoring group includes at least one distributed monitoring optical fiber, and each described point
Cloth monitoring optical fiber is axially set on the pipeline body inner wall along the pipeline body, each distributed monitoring optical fiber
It is respectively connected with light source generator and data acquisition device, the data acquisition device is connected with data processing centre.
The utility model embodiment at least has the following beneficial effects:
Feedwater piping leakage loss monitoring device provided by the utility model, it is mountable on feedwater piping, when feedwater piping is sent out
When raw leakage, rapid water-filling in the leakage loss monitoring inner cavity of outer protection tube part squeezes after water swelling rubber water swelling and is flush-mounted in it
Internal distribution type fiber-optic makes distribution type fiber-optic generate biggish strain, and then makes the incident light in optical fiber that position occur in strain
Generation wavelength is set different from remaining entopic backward Rayleigh scattering light, the distribution type fiber-optic (FBG) demodulator positioned at monitoring center can be known
Not abnormal backward Rayleigh scattering, and the position that leakage occurs is determined according to light propagation time in a fiber and spread speed
It sets, plays the role of leakage alarm and positioning.It is provided in this embodiment to give compared to traditional artificial leak hunting method of feedwater piping
Waterpipe leakage loss monitoring device is able to achieve the automatic real-time leakage loss monitoring to feedwater piping, and structure is simple, and monitoring sensitivity is high.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, it can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the cross-sectional structural schematic diagram for the feedwater piping leakage loss monitoring device that the utility model embodiment one provides；
Fig. 2 is the vertical profile structural schematic diagram for the feedwater piping leakage loss monitoring device that the utility model embodiment one provides；
Fig. 3 is a kind of feedwater piping on-line monitoring based on OFDR distribution type fiber-optic that the utility model embodiment three provides
The overall structure diagram of system；
Fig. 4 is the arragement construction figure for the distribution type fiber-optic component that the utility model embodiment three provides；
Fig. 5 is the partial enlarged view of Fig. 2；
Fig. 6 is the schematic cross-section for the distributed temperature compensated optical fiber that the utility model embodiment three provides；
Fig. 7 is the schematic longitudinal section of the arragement construction for the distribution type fiber-optic component that the utility model embodiment three provides.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
All other embodiment obtained, fall within the protection scope of the utility model.
Embodiment one
Such as Fig. 1 and Fig. 2, the utility model embodiment is provided and is protected outside a kind of feedwater piping leakage loss monitoring device, including annular
Pipe fitting 200, the outer protection tube part 200 have can be sleeved on feedwater piping 100 inner ring opening installation end and with it is described interior
Ring is open the leakage loss monitoring inner cavity of installation end connection, and water swelling rubber 300 and embedding is equipped in Yu Suoshu leakage loss monitoring inner cavity
The distribution type fiber-optic 400 being placed in the water swelling rubber 300,400 both ends of distribution type fiber-optic are pierced by described outer respectively
Pillar part 200.Generally, feedwater piping 100 is circular pipe, and corresponding above-mentioned outer protection tube part 200 is preferably circular ring shape pipe fitting,
And its annular diameters is roughly the same with 100 outer diameter of feedwater piping, with guarantee its inner ring opening installation end recline clamping to
On waterpipe 100.As a preferred option, above-mentioned outer protection tube part 200 includes two semi-ring tube bodies, and the two semi-ring tube bodies are spelled
It connects to fix and enclose and sets to form the leakage loss monitoring inner cavity；It is further preferred that being respectively equipped on two semi-ring tube bodies such as Fig. 1
The otic placode 201 of otic placode 201, two semi-ring tube bodies is bonded and is bolted on together, i.e., the outer protection tube part 200 is in hood type
Structure holds feedwater piping 100 tightly after two semi-ring tube body splicings, on the one hand guarantees the stabilization of 200 fixed structure of outer protection tube part
Property, the pressure that generates when water swelling rubber 300 expands can be born, on the other hand, minimize the outer protection tube part 200 with to
Leakproofness is improved in fit-up gap between waterpipe 100.Above-mentioned outer protection tube part 200 is outer ring plate and two pieces of rings including annular
The siding of shape, two sidings be preferably be tabular plate body, be connected to the left and right ends of outer ring plate and be used for and feedwater piping
100 connections, the vallecular cavity that two sidings and outer ring plate surround constitute above-mentioned leakage loss monitoring inner cavity, and slot bottom is outer protection tube part 200
The inner plate surface of outer ring plate.Above-mentioned water swelling rubber 300 is preferably fixed on the inner plate surface of above-mentioned outer ring plate.Above-mentioned outer ring
Plate, siding etc. all have certain thickness, preferably within the scope of 3~8mm.
It is further preferred that two halves endless tube body stitching portion is folded with silicagel pad, to guarantee the outer shield constituted after the two splicing
The leakproofness of pipe fitting 200.In addition, distribution type fiber-optic 400 wears place's encapsulation process on outer protection tube part 200, in the present embodiment,
It is sealed preferably by epoxy resin and distribution type fiber-optic 400 is fixed on outer protection tube part 200.
Feedwater piping leakage loss monitoring device provided in this embodiment, it is mountable on feedwater piping 100, work as feedwater piping
100 when missing, and rapid water-filling in the leakage loss monitoring inner cavity of outer protection tube part 200 squeezes after 300 water swelling of water swelling rubber
The press-fitted distribution type fiber-optic 400 loaded on its inside, makes distribution type fiber-optic 400 generate biggish strain, and then make entering in optical fiber
Light is penetrated after strain generation position generation wavelength is entopic different from remaining to Rayleigh scattering light, positioned at the distribution of monitoring center
400 (FBG) demodulator of formula optical fiber can identify abnormal backward Rayleigh scattering, and according to light propagation time in a fiber and propagate speed
Degree determines the position that leakage occurs, and plays the role of leakage alarm and positioning.It manually hunts leak compared to traditional feedwater piping 100
Method, feedwater piping leakage loss monitoring device provided in this embodiment are able to achieve the automatic real-time leakage loss monitoring to feedwater piping 100,
Its structure is simple, and monitoring sensitivity is high.
Preferably, above-mentioned distribution type fiber-optic 400 uses OFDR (probe beam deflation) distribution type fiber-optic 400, is both sensing
Element and signal transmission component, can monitoring object sum be more, signal transmission distance is farther out, it can be achieved that 25~35km range
The interior leakage loss monitoring along infinitely a measuring point of journey, thus can be well adapted for municipal water supply pipe network monitoring point have a very wide distribution, quantity
More features.Specifically, a distribution type fiber-optic 400 can be used and concatenate all leakage loss monitoring measuring points, the distribution type fiber-optic 400
Arrival end connects optical transmitting set and 400 (FBG) demodulator of distribution type fiber-optic, according to Xiang Ruili after 400 (FBG) demodulator of distribution type fiber-optic identification
Light is scattered, is the position that can determine whether leakage and occur according to the time of the backward Rayleigh scattering light of receiving；It is of course also possible to use more
The structure in parallel of root distribution type fiber-optic 400, either a distribution type fiber-optic 400 are connected each leakage loss monitoring measuring point or more points
Cloth optical fiber 400 is in parallel, can constitute on-line monitoring network, guarantees the effective monitoring to municipal water supply pipe network.
Preferably, the distribution type fiber-optic 400 is arranged with flexible shroud, and it is located at except the outer protection tube part 200
Fiber segment is also arranged with rigid sheath, and the rigid sheath is sheathed on except the flexible shroud.Pass through flexible shroud and rigidity
Sheath can preferably protect distribution type fiber-optic 400, can reduce interference of the external disturbance to optical fiber, and in outer protection tube part 200
Flexible shroud is only coated, guarantees that it can deform under the action of water swelling rubber 300.
The maximum swelling volume of preferably embodiment, above-mentioned water swelling rubber 300 is greater than in the leakage loss monitoring
The volume of chamber, so that water swelling rubber 300 can be tightly attached on 100 outer wall of feedwater piping and to water supply after complete expansion
100 outer wall of pipeline generates larger pressure, play the role of it is provisional independently repair, leakage rate can reduce after 8~10h occurs for leakage
After 50%, 30h leakage rate can reduce leakage rate after 90%, 50h can reduce by 95% or more (above data be pressure flow body be from
Water measures under the conditions of pressure 0.35MPa).The water swelling rubber 300 preferably uses vulcanization type expanded rubber 300, at
This is cheap, and expansion effect is preferable；It is further preferred that the vulcanization type expanded rubber 300 is by neoprene (CR322) and cross-linking type
Sodium Polyacrylate (PAANa, 400) water absorbent rate is higher than to be made after physical blending, two kinds of raw materials have no toxic and side effect to human body,
It is precipitated under the conditions of soaking for a long time without dissolved matter, therefore pollution will not be generated to the water in water distributing network, and its pressure resistance
Degree is 4MPa, tearing strength 3.5MPa, and the pressure of municipal network water supply is far below swollen generally between 0.3~0.6MPa
The compression strength of swollen rubber 300.
Embodiment two
The utility model embodiment provides a kind of feedwater piping, including pipeline body 100, and the pipeline body 100 is extremely
Small part pipeline section is equipped with feedwater piping leakage loss monitoring device provided by above-described embodiment one, and the outer protection tube part 200 is set with
In on the pipeline section of corresponding position.The specific structure of the feedwater piping leakage loss monitoring device does not repeat herein.In the present embodiment,
Feedwater piping leakage loss monitoring device is preferably mounted in the weak locations such as pipe joint in advance, such as flange-interface, bell socket, welding
The positions such as interface, hickey.Above-mentioned feedwater piping leakage loss monitoring device is mounted on 100 method of feedwater piping as Fig. 2 is shown
The schematic diagram of blue interface, in connecting flange is enclosed in by above-mentioned outer protection tube part 200, above-mentioned water swelling rubber 300 with connect
There is certain spacing between flange, be preferred with control in 10~20mm.Above-mentioned outer protection tube part 200 and pipeline body 100 it
Between link position at encapsulation process, such as in the two contact position sandwiched silicagel pad.
Embodiment three
It is supervised online as shown in figure 3, the utility model embodiment provides a kind of feedwater piping based on OFDR distribution type fiber-optic
Examining system is configurable on feedwater piping provided by above-described embodiment two comprising sequentially connected distribution type fiber-optic component
500, light source generator 600, data acquisition device 700 and data processing centre 900, the light source generator 600 are used
In emitting the scattering light that laser and reception distribution type fiber-optic component 500 are passed back to distribution type fiber-optic component 500, one can be used
Wide-band linearity swept light source and a Michelson's interferometer realize that the data acquisition device 700 is used for distributed light
The fiber-optic monitoring signal that fine component 500 is passed back is acquired, and photodetector can be used to realize, the photodetector acquires
The optical signal that distribution type fiber-optic component 500 is passed back converts optical signals into electric signal, and is passed by signal Wireless Transmitter 800
Data processing centre 900 is passed, the data processing centre 900 includes terminal computer and matched data processing software,
Monitor value for distribution type fiber-optic component 500 based on the received is analyzed, and every monitoring ginseng of feedwater piping 100 is obtained
Number.As shown in figs. 4 and 7, the distribution type fiber-optic component 500 includes being set to 100 inside different degree of fillings position of feedwater piping
The multiple monitoring groups set, in this implementation, there are three the monitoring group tools, including is respectively arranged at 100 degree of filling of feedwater piping
0.85, the first monitoring group 501 at 0.5 and 0.15 position, the second monitoring group 502 and third monitoring group 503, each monitoring
Group include a distributed monitoring optical fiber 505, the distributed monitoring optical fiber 505 be set to 100 inner wall of feedwater piping and along to
The axial setting of waterpipe 100.The utility model distributed monitoring optical fiber 505 is both signal induction device and signal transmission dress
The distributed on line monitoring, it can be achieved that feedwater piping 100 is set, and the monitoring System spatial resolution is high (up to mm grades), for
Monitoring system can obtain in real time fluid flow rate, transient flow, the pipe of the position along any point of journey by the strain value of optical fiber
The health status of road siltation and pipeline, monitoring comprehensively, help to carry out macro adjustments and controls to water supply system；The utility model monitoring
Precision height (can be accurate to 0.5 μ ε), monitoring range is wide (usually can be more than 50km), along Cheng Caiyong optical signal transmission, loss of signal
Small, anti-electromagnetic interference capability is strong.
As one of embodiment, the distributed monitoring optical fiber 505 includes the fiber core set gradually from inside to outside
5001, coat 5002, clad 5003 and flexible shroud 5004.Preferably, the distributed monitoring optical fiber 505 uses ring
Oxygen resin is pasted on 100 inner wall of feedwater piping.
As shown in figure 5, each monitoring group further includes a distributed strain compensated optical fiber as the preferred of the present embodiment
506, the distributed strain compensated optical fiber 506 is arranged side by side with the corresponding distributed monitoring optical fiber 505, and monitor value is made
For the reference of distributed monitoring optical fiber 505, to exclude the interference of outside noise, vibration etc..Optionally, the distributed strain
Compensated optical fiber 506 includes fiber core 5001, coat 5002, the clad 5003, flexible shroud set gradually from inside to outside
5004 and rigid sheath 5005, external interference is excluded by rigid sheath.The distributed strain compensated optical fiber 506 equally uses
Epoxy resin 7 is pasted on 100 inner wall of feedwater piping.
As shown in figure 4, the distribution type fiber-optic component 500 further includes being set to feedwater piping as the preferred of the present embodiment
The distributed temperature compensated optical fiber 504 on 100 inner wall tops, for monitoring strain caused by ambient temperature variation, thus to described
The monitor value of distributed monitoring optical fiber 505 compensates.As shown in fig. 6, optionally, the distributed temperature compensated optical fiber 504
Including fiber core 5001, coat 5002, clad 5003, flexible shroud 5004 and the rigidity shield set gradually from inside to outside
Set 5005 has gap, to guarantee optical fiber and flexible shroud between the flexible shroud 5004 and the rigid sheath 5005
5004 can move freely in rigid sheath 5005.The distributed temperature compensated optical fiber 504 is also pasted on using epoxy resin 7
100 inner wall of feedwater piping.By the way that distributed temperature compensated optical fiber 504 is set to 100 inner wall top of feedwater piping, tube fluid stream
Stress caused by dynamic can not directly act on distributed temperature compensated optical fiber 504, and pass through rigid sheath, caused by external interference
Stress can not also directly act on distributed temperature compensated optical fiber 504, i.e. the strain that monitors of distributed temperature compensated optical fiber 504
It is only related with ambient temperature variation.
Further, the distribution type fiber-optic component 500 is whole enters corresponding feedwater piping 100 along selected valve well,
Using 100 end of feedwater piping of the valve well downstream connection as monitoring starting point, each optical fiber of distribution type fiber-optic component 500 exists
It is arranged apart by arrangement needs in feedwater piping 100.In the position by selected valve well and valve downstream well, the distribution
Formula optical fiber component 500 is laid using the form of integral sleeve stainless steel sleeve pipe along valve well inner wall, prevents optical fiber broken by outside
Bad, optical fiber can move freely in stainless steel sleeve pipe.Distribution type fiber-optic component 500 is supervised in valve well without characteristic of fluid
It surveys, only carries out monitoring structural health conditions.
Each optical fiber of the distribution type fiber-optic component 500 can use general single mode fiber, low in cost, be suitble to
Large-scale use in water supply system.
Each optical fiber of distribution type fiber-optic component 500 is drawn in a manner of single-ended connection from monitoring starting point, and starting point is monitored
Position flexibly chosen in combination with the characteristics of water supply network, optical fiber final position is to monitor system end, and distal optical fiber is not necessarily to
Consider circuit.
The monitor value of the data processing centre 900 distribution type fiber-optic component 500 based on the received is analyzed, and acquisition is given
The specific method is as follows for every monitoring parameters of waterpipe 100:
The relationship being positively correlated using the spectral shift amount and fluid flow rate of distributed monitoring optical fiber 505, first using distribution
Formula optical fiber demarcates flow velocity and shearing stress in experimental enviroment, passes through calibration value and distributed prison during actual monitoring
The shearing stress inverse for surveying optical fiber 505 goes out fluid flow rate；
The range of pressure fluctuations of transient flow is obtained by the strain value and strain fluctuation range of distributed monitoring optical fiber 505
And energy dissipation situation；
It is bright according to the fluctuation range for whether occurring a certain section of strain value in the strain monitoring result of distributed monitoring optical fiber 505
The aobvious fluctuation less than strain value around the position, judges whether pipeline deposits；
Whether there is position constant strain abnormality peak value occur according to distributed monitoring optical fiber 505, judges feedwater piping 100
Whether occur that pipeline creep, Non-uniform Settlement, local fracture, connector falls off or the pipeline health problem of corrosive pipeline.
The data processing centre 900 can also be compensated by distributed strain compensated optical fiber 506 and distributed temperature
The monitor value of optical fiber 504 realizes the compensation to external interference, and the specific method is as follows:
The monitor value of distributed monitoring optical fiber 505 is subtracted to the monitor value of distributed strain compensated optical fiber 506, can be eliminated
Extraneous vibration mushing error；
The monitor value of distributed monitoring optical fiber 505 is subtracted to the monitor value of distributed temperature compensated optical fiber 504, can be eliminated
The error that ambient temperature variation generates.
By the measure of above-mentioned external interference error compensation, so that the precision of monitoring is higher.
Every monitoring parameters are obtained to data processing centre below and the principle that compensates to external interference and in detail
Method is illustrated.
The big monitoring parameters of data processing centre available five: flow monitoring, transient flow monitoring, degree of filling monitoring, pipeline
Sediment monitor ing and pipeline health monitoring parameter.
1) flow monitoring
In heavy caliber water-supply-pipe, water flowing form is mainly that nearly wall turbulent flow is sheared in unstable state, turbulent viscosity at any time with
Space and change, still immature about the theory of turbulent flow at present, it is accurately fixed that fluid is difficult to the circumferential shearing stress of inner wall of the pipe
Amount indicates, but can derive the qualitative relationship for proving itself and axial time average velocity by following.
Pipeline stream can be described with Navier-Stokes equation, but unintentional nonlinearity item leads to equation in equation
It can not accurately solve so far.French scholar Boussinesq is to the Reynalds stress item in Navier-Stokes equation
Quantitative research has been carried out, has derived axial shearing stress expression formula in turbulent flow:
In formula, αmFor turbulent fluctuation momentum exchange coefficient；
ρ is the density of water；
U, y is respectively axial flow velocity and circumferential flow velocity.
It is similar therewith, available pipeline stream circumferential direction shearing stress expression formula:
In conjunction with the semiempirical turbulent theory (mixing length theory) that German scholar L.Prandtl is proposed, to above-mentioned turbulent flow ring
It is further simplified, obtains to shearing stress formula:
In formula, l is the mean free path in stream group blending procedure.
Fluid circumferential direction turbulence intensity can be expressed from the next again:
Fluid turbulence intensity is to measure its turbulent fluctuation degree, and for nearly wall turbulent flow, axial time average velocity is bigger, fluid respectively to
Turbulent fluctuation is stronger, i.e., with the increase of axial time average velocity, circumferential flow rate-of-change is greater than axial time average velocity, it can be considered that
Formula middle termIt is positively correlated with fluid axial direction time average velocity, i.e., fluid axial direction time average velocity is bigger in feedwater piping, and fluid is to pipe
The circumferential shearing stress of road inner wall is also bigger.
Above-mentioned conclusion can also pass through the qualitative derivation of following formula:
The estimation formula of tubulence energy k is as follows:
In formula, v is the mean flow rate of fluid；
I is turbulence intensity, and calculation formula is as follows:
In formula, v is the mean flow rate of fluid；
υ is fluid motion viscosity；
D is hydraulic radius.
(1-5), (1-6) two formula are merged, obtained:
By formula (1-6) it can be concluded that the quantitative relationship of fluid mean flow rate and tubulence energy, in process fluid flow, turbulence
It can will be dissipated in the form of pulse viscous stress and the work of deformation that strain forms of pulsing, that is, turbulent vortices be formed, in inner wall of the pipe
Near, various sizes of turbulent vortices collide with inner wall of the pipe.Flow velocity is bigger, and Hydrodynamic turbulence can be bigger, turbulent vortices pair
The shearing stress of inner wall of the pipe is bigger.
For distribution type fiber-optic, it is dry that beat frequency occurs for the reference luminous energy in internal backward Rayleigh scattering light and reference arm
It relates to, Fourier transformation is carried out to interference spectrum, can obtain various information of the distribution type fiber-optic along journey, and distribution type fiber-optic
When point external condition (strain etc.) changes, the backward rayleigh scattering spectrum of the point shifts, and offset is directly proportional to strain value.
It is above positively correlated with fluid flow rate in the qualitative proof pipeline of two methods with pipeline circumferential direction shearing stress, by mechanics of materials public affairs
Formula is it is found that stress and strain suffered by material is directly proportional, and fibre strain is directly proportional to spectral shift amount, it is understood that
Spectral shift amount is positively correlated with fluid flow rate.Distribution type fiber-optic based on OFDR is extremely sensitive, and monitoring accuracy is up to 0.5 μ ε.It can
Flow velocity and shearing stress are demarcated in experimental enviroment using distribution type fiber-optic, passes through calibration value in later period monitoring and cuts and answer
Power can inverse go out fluid flow rate.It should be noted that Turbulence Flow is extremely complex, the flow monitoring function referred in the utility model
There can be certain error, but pass through the data accumulation in a variety of error concealment measures and later period monitoring process of this system proposition
It, can be by control errors in a certain range with check and correction.
2) transient flow (water hammer) monitors
Intelligent control is carried out according to key node of the real-time fluidised form information of feedwater piping to pipe-line system, is mainly reflected in
Valve opening variation, the variation of water pump operation operating condition etc..The variation of these system parameters will generate important shadow to in-pipe flow fluidised form
It rings, especially large diameter pipeline under flowing full state, close or water pump stops all that there may be water hammers suddenly, right by the unexpected of valve
Pipeline configuration damages.Russia scholar Joukovsky proposes the relationship of pipeline pressure and flow velocity under the conditions of transient flow:
In formula, Δ H is the head (m) of generation during sudden change of flow speed；
A is pressure wave speed (m/s)；
G is acceleration of gravity, (m/s2)；
V0 is fluids within pipes mean flow rate (m/s).
From the above equation, we can see that transient flow process medium fluid kinetic head is by partly or entirely being transformed into pressure head (ignores part
Water damage), biggish direct stress is generated to inner wall of the pipe, promotes distributive fiber optic strain.Since water hammer only occurs in pipeline part
Position will significantly increase, hence it is evident that big whole water-supply line in the strain value for the local location distribution type fiber-optic that water hammer occurs
In the strain value of this upstream and downstream other positions, embodying on the computer screen will be that ordinate (strain value) is abnormal raised
A string of instantaneous strain peaks, specifically, can be with by the abscissa fluctuation range (i.e. coverage) for reading string strain peak extremely
The range of pressure fluctuations of transient flow is obtained, by the available transient flow of most value for reading string strain spike peak and trough extremely
Energy dissipation situation.
3) pipeline sediment monitor ing
Raw water pipeline siltation usually occurs in local turning point or knick point, when the sediment deposit of pipeline covers third monitoring group
When, influence of the turbulent fluctuation of fluid to third monitoring group will substantially be weakened because of the presence of sediment deposit, the distribution of third monitoring group
Monitoring fibre strain monitoring result will be wave that the corresponding strain value fluctuation range of certain section of abscissa is significantly less than around the position
It is dynamic, furthermore by the strain signal difference of comparison same position the second monitoring group and third monitoring group, it also can determine whether the silt of pipeline
Product position, and then the abscissa value is read, it can further obtain the length that siltation pipeline section occurs.
4) pipeline health monitoring
Distributed optical fiber sensing system can also be achieved pipeline creep, Non-uniform Settlement, local fracture, connector fall off, manage
The pipelines health monitorings such as road corrosion.The above phenomenon is based on distributive fiber optic strain monitoring principle, i.e., when pipeline somewhere goes out
When the existing above problem, the corresponding position of distribution type fiber-optic will appear constant strain abnormality peak, by reading the strain abnormality peak
Corresponding abscissa positions, and coordinate system conversion is carried out, it can be obtained the specific location of pipeline accident point.It is worth noting that
When pipeline occurs to disconnect, be broken etc., the distribution type fiber-optic of corresponding position may be broken, and be remained in that case by rear
Fault point is positioned to Rayleigh scattering, but the later period needs to change the optical fiber of corresponding position.The local replacing of distribution type fiber-optic can
It is completed by optical fiber splicer.
Feedwater piping is usually embedded in below urban road, and the interference such as extraneous vibration is larger, and the data processing centre is also
It can be compensated using following interference compensation method:
1) strain compensation
Feedwater piping or deep tunnel are usually embedded in below urban road, the vibration of the generations such as vehicle driving or tube circumference construction
It is dynamic certain interference to be caused to distributed optical fiber sensing system.To exclude the above interference, in the first, second and third monitoring group
In, a distributed strain compensated optical fiber is respectively set.Distributed strain compensated optical fiber outermost is coated using rigid sheath, can be kept away
Exempting from fluids within pipes flowing influences it, and outermost rigid sheath is closely connect with the flexible shroud of time outer layer, it is believed that
The monitor value of strain compensation optical fiber is that the comprehensive of external interference embodies, and the monitor value of distributed monitoring optical fiber is subtracted distribution and is answered
The monitor value for becoming compensated optical fiber, can eliminate external interference error.
2) temperature-compensating
Distributed optical fiber sensing system will be mounted in pipeline and work for a long time, with season alternation, ambient temperature variation
Inside of optical fibre refractive index will be caused to change, to generate certain error.For this purpose, laying one point on inner wall of the pipe top
Cloth temperature-compensated fiber, the optical fiber outermost layer are rigid sheath, and secondary outer layer is flexible shroud, rigid sheath and flexible shroud it
Between there are a fixed gap, i.e., distribution type fiber-optic and its flexible clad can in rigid sheath free extension.By this kind of measure,
Stress caused by external interference and tube fluid flow can not directly act on temperature-compensated fiber, i.e. temperature-compensated fiber monitors
The strain arrived is only related with ambient temperature variation.The monitor value of distributed monitoring optical fiber is subtracted into distributed temperature compensated optical fiber
Monitor value can eliminate the error that ambient temperature variation generates.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model
Protection scope within.
Claims (10)
1. a kind of feedwater piping leakage loss monitoring device, it is characterised in that: including annular outer protection tube part, the outer protection tube part has can
The inner ring opening installation end being sleeved on feedwater piping and the leakage loss monitoring inner cavity being connected to inner ring opening installation end, in
Water swelling rubber and the distribution type fiber-optic in the water swelling rubber, institute are equipped in the leakage loss monitoring inner cavity
It states distribution type fiber-optic both ends and is pierced by the outer protection tube part respectively.
2. feedwater piping leakage loss monitoring device as described in claim 1, it is characterised in that: the maximum of the water swelling rubber
Swelling volume is greater than the volume of the leakage loss monitoring inner cavity.
3. feedwater piping leakage loss monitoring device as claimed in claim 1 or 2, it is characterised in that: the water swelling rubber is
Vulcanization type expanded rubber.
4. feedwater piping leakage loss monitoring device as described in claim 1, it is characterised in that: the outer protection tube part includes two and half
Endless tube body, the two semi-ring tube body splicings, which are fixed and enclosed, to be set to form the leakage loss monitoring inner cavity.
5. feedwater piping leakage loss monitoring device as claimed in claim 4, it is characterised in that: two semi-ring tube body stitching portions folder
Equipped with silicagel pad.
6. feedwater piping leakage loss monitoring device as described in claim 1, it is characterised in that: the distribution type fiber-optic is arranged with soft
Property sheath, and it is located at the fiber segment except the outer protection tube part and is also arranged with rigid sheath, the rigid sheath is sheathed on institute
It states except flexible shroud.
7. feedwater piping leakage loss monitoring device as described in claim 1, it is characterised in that: the distribution type fiber-optic is described outer
Place's encapsulation process is worn on pillar part.
8. a kind of feedwater piping, including pipeline body, it is characterised in that: at least partly pipeline section of the pipeline body is equipped with such as
Feedwater piping leakage loss monitoring device described in any one of claims 1 to 7, the outer protection tube part are set in corresponding position
On pipeline section.
9. feedwater piping as claimed in claim 8, it is characterised in that: be set with to the connecting portion less than the pipeline body
There is the outer protection tube part.
10. feedwater piping as claimed in claim 8, it is characterised in that: be disposed with multiple monitoring groups in the pipeline body, respectively
The monitoring group is sequentially arranged along the pipeline body difference degree of filling position, and each above-mentioned monitoring group includes at least one distribution
Formula monitors optical fiber, and each distributed monitoring optical fiber is axially set on the pipeline body inner wall along the pipeline body,
Each distributed monitoring optical fiber is respectively connected with light source generator and data acquisition device, and the data acquisition device is connected with
Data processing centre.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821361833.0U CN208817102U (en) | 2018-08-23 | 2018-08-23 | Feedwater piping and its leakage loss monitoring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821361833.0U CN208817102U (en) | 2018-08-23 | 2018-08-23 | Feedwater piping and its leakage loss monitoring device |
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| Publication Number | Publication Date |
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| CN208817102U true CN208817102U (en) | 2019-05-03 |
Family
ID=66274278
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| CN201821361833.0U Active CN208817102U (en) | 2018-08-23 | 2018-08-23 | Feedwater piping and its leakage loss monitoring device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109099320A (en) * | 2018-08-23 | 2018-12-28 | 中铁第四勘察设计院集团有限公司 | Feedwater piping and its leakage loss monitoring device |
| CN111963800A (en) * | 2020-08-19 | 2020-11-20 | 孙龙 | Anti-leakage chemical pipeline flange |
| CN112524496A (en) * | 2020-11-23 | 2021-03-19 | 中国计量大学 | Experimental device for improve system alarm precision is revealed to optic fibre temperature detection water pipe |
-
2018
- 2018-08-23 CN CN201821361833.0U patent/CN208817102U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109099320A (en) * | 2018-08-23 | 2018-12-28 | 中铁第四勘察设计院集团有限公司 | Feedwater piping and its leakage loss monitoring device |
| CN111963800A (en) * | 2020-08-19 | 2020-11-20 | 孙龙 | Anti-leakage chemical pipeline flange |
| CN112524496A (en) * | 2020-11-23 | 2021-03-19 | 中国计量大学 | Experimental device for improve system alarm precision is revealed to optic fibre temperature detection water pipe |
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