CN207937324U - A kind of pressure-detecting device of integrity of ultrafiltration membrane for identification - Google Patents
A kind of pressure-detecting device of integrity of ultrafiltration membrane for identification Download PDFInfo
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- CN207937324U CN207937324U CN201820439950.8U CN201820439950U CN207937324U CN 207937324 U CN207937324 U CN 207937324U CN 201820439950 U CN201820439950 U CN 201820439950U CN 207937324 U CN207937324 U CN 207937324U
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Abstract
The utility model proposes a kind of pressure-detecting devices of integrity of ultrafiltration membrane for identification, it includes that gas provides unit, ultrafiltration film unit, pressure sensor, data acquisition unit and data record unit, raw water end chamber inflated of the unit to ultrafiltration film unit is provided by gas, the raw water end air chamber pressure that damaged ultrafiltration membrane is detected using pressure sensor is changed with time relationship, and got off by data acquisition unit and data recording unit records, you can integrity of ultrafiltration membrane situation for identification.The pressure-detecting device is easy to operate, highly practical.The case where monitoring ultrafiltration membrane raw water end air chamber pressure in conjunction with the method for establishing model belongs to non-destructive Direct Recognition method, and accuracy of detection is high, and accuracy is high, and detection is timely, and easy to operate.
Description
Technical field
The utility model belongs to detection integrity of ultrafiltration membrane technical field, more particularly, to a kind of ultrafiltration for identification
The pressure-detecting device of film integrality.
Background technology
It is sewage and drinking water by the new wastewater treatment method of core of membrane technology with the increasingly promotion of living standard
Improvement provides technical guarantee.Membrane separation technique is to the effectively catching ability of microorganism, bacterium and particulate matter in water process
Obtained in field it is universal recognize, operating pressure is relatively low, and effluent quality is stablized relatively, and can be with multiple technologies original
Position, dystopy coupling, any section of traditional handicraft can be placed in, had substitution traditional wastewater and drinking water treatment technique dive
Power.However, the deficiency due to membrane module in terms of installation and maintenance, overstress variation caused by the aeration cleaning of violent film,
And sharp polluter etc. be easy to cause membrane fiber breakage in raw water.Once there is breakage in membrane fiber, will seriously affect out
Water water quality causes damages to the health of people.
It is mainly indirectly testing method that existing integrity of ultrafiltration membrane, which knows method for distinguishing, such as the water quality by detecting filter liquor
Situation speculates whether ultrafiltration membrane is complete indirectly, or directly the variation of detection air chamber pressure, pressure-detecting device are practical only
Including a pressure gauge, precision is inadequate, and correspondingly its existing major defect is that precision is relatively low, and detection not in time, cannot meet
The qualitative or quantitative demand of integrity of ultrafiltration membrane identification.
Utility model content
For the disadvantages described above or Improvement requirement of the prior art, it is complete that the utility model provides a kind of ultrafiltration membrane for identification
The pressure-detecting device of whole property, when fully combining ultrafiltration membrane breakage under the gas chamber certain pressure of raw water end, in ultrafiltration membrane breakage hole
It generated at mouthful, grow the characteristics of bubble, proposed a kind of pressure-detecting device of integrity of ultrafiltration membrane for identification, utilize the device
The raw water end air chamber pressure of detection ultrafiltration membrane side changes with time relationship, you can integrity of ultrafiltration membrane for identification.Thus
Solve precision existing for the pressure-detecting device of the prior art is relatively low, detection not in time, cannot to meet integrity of ultrafiltration membrane qualitative
Or the technical issues of quantitative judge demand.
To achieve the above object, according to the one side of the utility model, it is complete to provide a kind of ultrafiltration membrane for identification
Property pressure-detecting device, including gas provide unit, ultrafiltration film unit, pressure sensor, data acquisition unit and data note
Record unit；Wherein,
The ultrafiltration film unit includes ultrafiltration membrane, raw water end gas chamber and water outlet liquid；Raw water end gas chamber and water outlet
End liquid is located at the both sides of the ultrafiltration membrane, and raw water end gas chamber is the gas chamber that will be obtained after the drain of raw water end；
The gas of raw water end gas chamber is leaked by damaged aperture after the ultrafiltration membrane breakage, and gas is formed in the water outlet liquid
Bubble；
The gas provides unit and is connected with raw water end gas chamber, to raw water end gas chamber provide gas with
Make the raw water end gas chamber pressurising；
The pressure sensor is connected with raw water end gas chamber, the pressure for measuring raw water end gas chamber；And
Obtained pressure signal will be measured and be changed into electric signal；
The data acquisition unit is connected with the pressure sensor, detects for acquiring the pressure sensor
Electric pressure signal；
The data record unit is connected with the data acquisition unit, and the data record unit is preserved for recording
The collected electric pressure signal data of data acquisition unit.
Preferably, it is nitrogen cylinder or air bottle, i.e. nitrogen bomb or air bomb that the gas, which provides unit,.
Preferably, the pressure of raw water end gas chamber is 135~220kPa
Preferably, data acquisition unit sampling at least 100 points per second.
Preferably, the pressure-detecting device further includes the first ball valve, and first ball valve is set to the gas and provides
Between unit and the ultrafiltration film unit, first ball valve provides unit and the ultrafiltration film unit for blocking the gas
Between pressure contact so that the formation of bubble is the process of non-constant, the discontinuous ventilation of a pressure.
In general, it can obtain down the above technical solutions conceived by the present invention are compared with the prior art,
Row advantageous effect：
The utility model proposes a kind of pressure-detecting devices of integrity of ultrafiltration membrane for identification comprising gas provides
Unit, ultrafiltration film unit, pressure sensor, data acquisition unit and data record unit provide unit to ultrafiltration by gas
The raw water end chamber inflated of film unit detects the change of the raw water end air chamber pressure of damaged ultrafiltration membrane at any time using pressure sensor
Change relationship, and got off by data acquisition unit and data recording unit records, the data detected substitute into ultrafiltration membrane bubble
Model, you can identification integrity of ultrafiltration membrane situation.The pressure-detecting device is easy to operate, highly practical.In conjunction with establishing model
Method monitors the case where ultrafiltration membrane raw water end air chamber pressure, belongs to non-destructive Direct Recognition method, accuracy of detection is high, accuracy
Height, detection is timely, and easy to operate.By ultrafiltration membrane bubble Model Calculating Method, it can quantify and obtain ultrafiltration membrane breakage aperture
Size, and can improve detection accuracy of identification by increasing raw water end gas chamber initial pressure.
Description of the drawings
Fig. 1 is the pressure-detecting device of the utility model integrity of ultrafiltration membrane for identification；
Fig. 2 is the utility model integrity of ultrafiltration membrane recognition methods flow diagram；
Fig. 3 is the utility model ultrafiltration membrane cell schematics；
Fig. 4 is that the utility model continuous air bubbles form flow chart.
In all the appended drawings, identical reference numeral is used for indicating identical element or structure, wherein：
1- gases provide unit；2- ultrafiltration film units；21- ultrafiltration membranes；22- raw waters end gas chamber；The water outlets 23- liquid；3-
Pressure sensor；4- data acquisition units；5- data record units, 6- bubbles, the first ball valves of 7-.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.In addition, institute in the various embodiments of the present invention described below
The technical characteristic being related to can be combined with each other as long as they do not conflict with each other.
The utility model provides a kind of pressure-detecting device of integrity of ultrafiltration membrane for identification, as shown in Figure 1, including
Gas provides unit 1, ultrafiltration film unit 2, pressure sensor 3, data acquisition unit 4 and data record unit 5；Wherein,
The ultrafiltration film unit includes ultrafiltration membrane 21, raw water end gas chamber 22 and water outlet liquid 23；Raw water end gas chamber
22 and water outlet liquid 23 be located at the both sides of the ultrafiltration membrane 21, raw water end gas chamber 22 is by raw water end drain
The gas chamber obtained afterwards；The gas of raw water end gas chamber 22 is leaked by damaged aperture after 21 breakage of the ultrafiltration membrane, described
23 form bubble in the liquid of water outlet.
Gas provide unit 1 be connected with raw water end gas chamber 22, to raw water end gas chamber 22 provide gas so that
The raw water end gas chamber pressurising, it is ensured that the enough pressure of raw water end gas chamber 22；Elevated pressure nitrogen can be provided when practical application to be arbitrary
The device of gas or air.Pressurising is carried out to raw water end gas chamber 22 so that the pressure in raw water end gas chamber 22 is more than initial
Under the conditions of pressure at the breakage aperture of ultrafiltration membrane water outlet.Assume that ultrafiltration membrane includes a damaged hole, not to raw water end gas chamber
Pressure at 22 hypothesis breakage apertures when being inflated is the pressure under primary condition at the breakage aperture of ultrafiltration membrane water outlet.
Gas chamber 22 pressure in raw water end is more than the pressure at the breakage aperture of ultrafiltration membrane water outlet, can be at ultrafiltration membrane breakage aperture to water outlet
Extreme direction forms bubble 6.But higher raw water end air chamber pressure can ensure accuracy of identification and the accuracy in damaged aperture.Such as
Fruit requires ultrafiltration membrane breakage port size accuracy of identification to reach 3 microns, integrity of ultrafiltration membrane identification side according to the present utility model
Method, raw water end air chamber pressure are at least 135kPa, and preferably pressure is 135~220kPa, i.e., preferred pressure is 1.35~2.2 marks
Quasi- atmospheric pressure.Pressure under primary condition at the breakage aperture of ultrafiltration membrane water outlet can also regard the pressure in primary condition bubble as
Power.
Pressure sensor 3 is connected with raw water end gas chamber 22, the pressure for measuring raw water end gas chamber 22；And it will measure
To pressure signal be changed into electric signal.
Data acquisition unit 4 is connected with pressure sensor 3, the pressure telecommunications detected for acquiring pressure sensor 3
Number；Data acquisition unit 4 is a data collecting card.
Data record unit 5 is connected with data acquisition unit 4, and data record unit 5 preserves data acquisition for recording
4 collected electric pressure signal data of unit.Data record unit 5 is a computer in the present embodiment, is installed on the computer
There is the data logging software mating with data collecting card, the data record on capture card can be stored in the software.Data
Capture card sample rate maximum can be 100kSa/s, i.e. 100,000 data of acquisition per second, and sampling clock precision is 20ns, resolution ratio
12-bit indicates that the digital minimum change that can be differentiated is the 1/4096 of range, can reflect the numerical value measured by pressure sensor.
The pressure-detecting device further includes the first ball valve 7, and first ball valve 7 is set to the gas and provides unit 1
Between the ultrafiltration film unit 2, first ball valve 7 provides unit 1 and the ultrafiltration film unit 2 for blocking the gas
Between pressure contact so that the formation of bubble 6 is the process of non-constant, the discontinuous ventilation of a pressure.
Integrity of ultrafiltration membrane is carried out by means of above-mentioned pressure-detecting device and knows method for distinguishing, and flow chart is as shown in Fig. 2, include
Following steps：
(1) by the drain at ultrafiltration membrane raw water end, obtain raw water end gas chamber, when the raw water end, that is, ultrafiltration membrane work into
Water end (W.E.) after the drain of raw water end, obtains closed raw water in the integrity of ultrafiltration membrane recognition methods for carrying out the utility model
Hold gas chamber.Ultrafiltration membrane both sides are respectively water outlet liquid and raw water end gas chamber.
(2) step (1) the raw water end gas chamber is inflated so that the pressure of raw water end gas chamber is more than initial strip
Pressure under part at the breakage aperture of ultrafiltration membrane water outlet.
(3) to raw water end gas chamber carry out pressurize experiment, using above-mentioned pressure test device test raw water end air chamber pressure with
The variation of time, sampling at least 100 points per second；Obtain the pressure change data of raw water end air chamber pressure at any time.If should
Delta data matches with ultrafiltration membrane change in pressure drop data completely new under the same terms, shows that the ultrafiltration membrane is complete；Otherwise it executes
Step (4).
(4) ultrafiltration membrane bubble model is established, the ultrafiltration membrane bubble model is used to simulate under the ultrafiltration membrane breakage,
Bubble Formation Process Central Plains water end (W.E.) air chamber pressure changes with time situation at the corresponding damaged aperture in different damaged aperture.
Ultrafiltration membrane bubble model includes single isolated bubbles model and continuous air bubbles model, and wherein single isolated bubbles are generated, grown
The construction step of model is specially：
Fig. 3 is ultrafiltration membrane cell schematics comprising ultrafiltration membrane has divided raw water end gas chamber and water outlet liquid, it is assumed that super
It is d to have a breakage, damaged aperture among filter membraneOR, the raw water end chamber volume of ultrafiltration membrane lower end is Vg, raw water end gas indoor gas
Pressure is Pg, gas density ρg, the gross mass of the gas contained in the gas chamber of raw water end is mg.There is stagnant above ultrafiltration membrane
Liquid only is referred to as water outlet liquid, fluid density ρ in the utility modell, liquid level height is H, and the pressure of liquid level is
Standard atmospheric pressure Patm.In bubble generation and growth course, the pressure in bubble constantly changes, and is denoted as Pb, while bubble not medium well
It is long, bubble volume VbConstantly increase, until bubble is detached from filter membrane.Gas forms bubble, mistake by ultrafiltration membrane breakage micropore
Hole flow velocity is u0。
By the small aperture of the bubble of raw water end gas chamber, generation below ultrafiltration membrane and generation bubble, (ultrafiltration membrane is damaged
Micropore) it is regarded as a control volume entirety, this is whole as research object, according to mass conservation law, in arbitrary a period of time
It is interior, into the quality of the gas of the control volume whole interior, be equal within the period, the mass change of the gas in bubble and
The sum of mass change of the indoor gas of gas (ignores the quality that gas retains in small aperture and film internal capillary structure to become
Change).According to gas equation PV=mRT/M ideally, can obtain,
Therefore, the increment of gaseous massThe raw water end indoor mass incremental of gas isDue to working as after gas room pressure reaches design pressure, nitrogen cylinder air valve is closed, so the gas of the control volume
Body dilatation is 0, thus can obtain the mass-conservation equation of the control volume such as formula (2),
As the indoor pressure P of gasgCompared with bubble internal pressure PbWhen big, the indoor gas of gas will be flowed to by aperture in bubble
Portion, flow velocity of the gas in the small aperture of filter membrane breakage are u0, unit m/s, the gas for crossing aperture is pressure flow body, then bubble
What forming process can be considered thin wall small hole mouth floods stream, floods stream public affairs according to the thin wall small hole mouth in hydraulic formula
Formula (3), wherein Q are to go out flow by the fluid of thin wall small hole mouth, and μ indicates that the coefficient for orifice of thin wall small hole mouth, Δ h are thin-walled
Both sides fluid level is poor, and A is orifice area, and shown in thin-walled both sides fluid pressure difference Δ P calculation formula such as formula (4), ρ is fluid
Density.
Δ P=ρ g Δs h (4)
Ultrafiltration membrane breakage aperture is considered as the thin wall small hole mouth in hydraulic formula, both sides pressure difference at ultrafiltration membrane breakage aperture
The as difference of raw water end gas indoor pressure and the pressure in bubble, correspondingly, in Bubble Formation Process from raw water end gas chamber into
Enter gas in bubble is by the flow velocity in damaged aperture
μ indicates the orifice outflow coefficient of ultrafiltration membrane breakage micropore wherein in formula (5), uses for reference the value in hydraulic formula,
It is general to take 0.60~0.62, value 0.62 in the present embodiment.
Gas indoor gas is the mass incremental of bubble by the quality in damaged aperture, therefore has,
Mass-conservation equation existing for plenum interior is as follows：
Wherein QEnter、QGo outIndicate the flow into and out of gas chamber, in the model QEnterIt is 0.And because
Then have
Bubble formation is a continuously process in this experiment, and the indoor decline of pressure of gas is also one continuous
Process, it is believed that have the sufficient time to balance inside and outside temperature, so the process can be considered as the variation of an isothermal,
Thus temperature correction coefficient χ values are 1.
The actual conditions of bubble formation are extremely complex, and actual primary condition is often unknown, the shape of incipient bubble
Selection be it is a kind of consider after result.At the beginning of bubble formation, the speed of all physical quantitys and the initial value of acceleration take
It is 0.The formula of primary condition is as follows, and wherein the initial pressure of gas chamber is then aperture hydrostatic pressure, surface tension and film elasticity
Pressure PeThe sum of, as shown in formula (11)：
P in formulaeFor film elastic pressure, measuring, t=0 tables can be carried out to ultrafiltration membrane according to prior art assay method
Show initial time, Pg|0For the air chamber pressure carved at the beginning, Pb|0For the pressure in bubbles carved at the beginning, PatmFor atmospheric pressure,
ρlFor fluid density, H is liquid height on film, and σ is wetting fluid surface tension, VbFor bubble volume, u0Expression passes through ultrafiltration membrane
The flow velocity of gas when damaged aperture.
When plenum interior pressure is begun to decline, since film pressure at both sides is poor, gas chamber interior air-flow is past by the breakage of film
The film other side is moved, and bubble initially forms, and the pressure inside bubble increases with the reduction of plenum interior pressure, when film both sides
When reaching pressure balance, bubble is in the stage for being detached from film surface at this time, and bubble formation neck is shunk, and then old bubble is detached from
Film surface, new bubble enter the expansion stage.So in cycles, the continuous decaying of gas room pressure will make through aperture
Bubble Formation Process constantly moves in circles.
The ultrafiltration membrane single isolated bubbles model finally obtained is：
According to the model, the m files of program are write in matlab softwares based on Fourth order Runge-Kutta, complete single gas
Bubble forms the foundation of model.Single isolated bubbles based on foundation form model, are allowed to carry out loop computation with and if for sentences,
Reach the state that bubble is formed continuously growth, program flow diagram is as shown in Figure 4.
Primary ultrafiltration film characteristic parameter is inputted into the single isolated bubbles model, the primary ultrafiltration film characteristic parameter includes just
The raw water end air chamber pressure of beginning condition, film elastic pressure, surface tension of liquid, liquid height, fluid density and hypothesis on film
Damaged aperture obtains raw water end air chamber pressure P by calculatinggWith the pressure P in the bubble of formationbThe value changed over time, than
Compared with raw water end air chamber pressure P under first time stepgWith the pressure P in the bubble of formationbSize.
If raw water end air chamber pressure PgWith the pressure P in bubblebDifference be more than 10Pa, be considered as single isolated bubbles be in after
Continuous growth conditions, are not detached from ultrafiltration membrane surface, this moment is calculated to the raw water end air chamber pressure, bubble volume, bubble of gained
The result of calculation of interior pressure and raw water end chamber volume replace respectively the raw water end air chamber pressure of primary condition, bubble volume,
The value of pressure and raw water end chamber volume in bubble is calculated, and next time step in the same Bubble Formation Process is obtained
The result of calculation of long raw water end air chamber pressure, bubble volume, the pressure in bubble and raw water end chamber volume repeats the mistake
Journey constantly records each item data in cyclic process, until raw water end air chamber pressure PgWith the pressure P in bubblebDifference be less than
10Pa。
If raw water end air chamber pressure PgWith the pressure P in bubblebDifference be less than or equal to 10Pa, show that air bubble growth finishes,
Bubble is detached from ultrafiltration membrane surface；Extraction calculates the raw water end air chamber pressure P of gained at this timegThis numerical value is substituted initial strip by numerical value
The raw water end air chamber pressure of part, other parameters still use each parameter value of primary condition, and using this array as primary condition, repeat
The calculating process of the continuous growth conditions of single isolated bubbles is less than or equal to primary condition until calculating gained raw water end gas room pressure
Bubble internal pressure.
When raw water end air chamber pressure be less than or equal to primary condition bubble internal pressure when, bubble is difficult to be formed, then this
When bubble be formed continuously process and terminate, different moments corresponding air chamber pressure P during record calculatesg, obtain continuous air bubbles mould
Type.
(5) ultrafiltration membrane characteristic parameter is inputted into the ultrafiltration membrane bubble model, and by step (3) the raw water end gas chamber pressure
The power data that change with time import the ultrafiltration membrane bubble model and are calculated, and ultrafiltration membrane breakage size are obtained, to identify
The integrality of the ultrafiltration membrane.Step (5) specifically includes following sub-step：
(5-1) by according to ultrafiltration membrane bubble model obtain it is a certain when the raw water end air chamber pressure inscribed calculate data and step
Suddenly the raw water end air chamber pressure measured data under the synchronization that (3) obtain is considered as one group of data, compares and is initially formed from bubble
To bubble stop being formed every group of data in the entire period fall into a trap count according to and measured data ratio, obtain several ratios,
To several ratio averagings, which is used as to the correction factor it is initially assumed that damaged aperture；Here data are calculated
Refer to that raw water end air chamber pressure Pg calculates data, measured data refers to raw water end air chamber pressure PgMeasured data.
(5-2) by it is initially assumed that damaged aperture with described in step (5-1) it is initially assumed that the correction factor in breakage aperture is multiplied
After obtain revised damaged aperture, using the revised damaged aperture as new it is initially assumed that damaged aperture substitutes into surpass again
Filter membrane bubble model is calculated, other initial condition parameters value is constant, obtains new it is initially assumed that under the conditions of damaged aperture
Different moments raw water end air chamber pressure calculates data；
(5-3) returns to step (5-1) and step (5-2), up to the calculating of raw water end air chamber pressure under different moments
The average value of the ratio of data and measured data and the absolute value of 1 difference are less than 0.01, then are considered as and calculate data and actual measurement number
According to almost the same, the revised damaged aperture for calculating gained at this time is exactly the equivalent damaged aperture that calculation is returned under this method.
This method can effectively identify the problem of ultrafiltration membrane breakage, need not handle film, easy to operate, precision
It is high.
Embodiment 1
It is the pressure inspection that one of which provided by the utility model is preferably used in identification integrity of ultrafiltration membrane as shown in Figure 1
Device is surveyed, it is a nitrogen cylinder that wherein gas, which provides unit 1, for providing gas source and meeting pressure demand；Ultrafiltration film unit 2
That is bubble formation place, by the long 30mm in upper part, wide 25mm, high 40mm, lower part long 30mm, wide 25mm, high 20mm two has
Machine glass component constitute, two parts can use flange tight seal together, air-tightness is good, ultrafiltration membrane 21 be in two components it
Between, by flange seal together with rubber ring, due to membrane fiber breakage, gas leak forms bubble, and gas chamber pressure changes；
Upper segment space is equivalent to 23 memory space of water outlet liquid, and lower part space is equivalent to ultrafiltration membrane raw water end gas chamber 22；Pressure
Sensor 3, which can measure pressure and pressure signal is changed into electric signal, passes to data acquisition unit 4, data acquisition unit 4
For a data collecting card, it is 0-100kPa, 0.25 grade of accuracy class, output current 4- that pressure sensor 3, which measures pressure limit,
20mA；Data acquisition unit 4 is transacter, and effect is that the electric signal for carrying out the transmission of pressure sensor 3 is converted to number
Word signal simultaneously sends the software records in computer i.e. data record unit 5 to, and data collecting card sample rate maximum can be 100kSa/
S, i.e. 100,000 data of acquisition per second, sampling clock precision are 20ns, resolution ratio 12-bit, indicate that the number that can be differentiated is minimum and become
Change is the 1/4096 of range, can be with the numerical value measured by response sensor；The mating software of computer installation data capture card can be shown
Show that measurement data changes and records preservation.The material of experimental provision and the model specification of instrument are shown in Table 1.
1 experiment material of table, specification and model
In the film integrality detects identification experiment, ultrafiltration membrane needs first to be impregnated with simulation filter membrane at work with ultra-pure water moistening
State.Isolation nitrogen pressure is needed to continue to transmit in Bubble Formation Process, one pressure of formation is non-constant, discontinuous ventilation
Condition, and bubble generation time is shorter in this experiment, and bubble formation is quick on the draw, therefore the pressure when bubble initially forms
Need the condition for being rapidly reached experimental design.Therefore the first ball valve 7 is additionally provided between nitrogen cylinder and ultrafiltration film unit, first
Ball valve 7 is responsible for blocking gas cylinder and the pressure of bubble generation system contacts so that the formation of bubble is that a pressure is non-constant, non-company
The process of continuous ventilation.
When being pressurized to 180kPa to raw water end gas 22 using nitrogen cylinder, the first ball valve 7 is closed, when plenum interior pressure is opened
When beginning to decline, since film pressure at both sides is poor, gas chamber interior air-flow is moved by the breakage of film toward the film other side, and bubble starts shape
At, the pressure inside bubble increases with the reduction of plenum interior pressure, when film both sides reach pressure balance, bubble at this time
In the stage for being detached from film surface, bubble formation neck is shunk, and then old bubble is detached from film surface, and new bubble enters expansion
Stage.So in cycles, the continuous decaying of gas room pressure will be such that the Bubble Formation Process by aperture constantly recycles past
It is multiple.
The parameter physical quantity value of primary condition is：ρg=1.29kg/m3,ρl=997kg/m3, χ=1, μ=0.62, σ=
72.8mN/m and Patm=1.01 × 105Pa, Pg=180kPa, Pe=20mbar, H=30mm, it is assumed that damaged size 0.24mm,
Vg=365.59mL.
The model and experimental method established according to specific embodiment part, are simulated and are surveyed PgValue, and will
Numerical value is compared, and first time correction factor is 0.708, corrects back aperture 0.170mm, and second of correction factor 1.039 is corrected
Back aperture 0.177, calculates repeatedly, and last modified correction factor is 1.00009, and it is 0.178 to correct back aperture, tests institute
With acupuncture needle diameter 0.180mm, a diameter of 0.183mm in effective aperture known to after microscope and PaintShop processing.Phase
To error 2.7%.
As it will be easily appreciated by one skilled in the art that the above is only the preferred embodiment of the utility model only, not
To limit the utility model, any modification made within the spirit and principle of the present invention, equivalent replacement and change
Into etc., it should be included within the scope of protection of this utility model.
Claims (4)
1. a kind of pressure-detecting device of integrity of ultrafiltration membrane for identification, which is characterized in that provide unit, ultrafiltration including gas
Film unit, pressure sensor, data acquisition unit and data record unit；Wherein,
The ultrafiltration film unit includes ultrafiltration membrane, raw water end gas chamber and water outlet liquid；Raw water end gas chamber and water outlet liquid
Body is located at the both sides of the ultrafiltration membrane, and raw water end gas chamber is the gas chamber that will be obtained after the drain of raw water end；It is described
The gas of raw water end gas chamber is leaked by damaged aperture after ultrafiltration membrane breakage, and bubble is formed in the water outlet liquid；
The gas provides unit and is connected with raw water end gas chamber, to provide gas so that institute to raw water end gas chamber
State the gas chamber pressurising of raw water end；
The pressure sensor is connected with raw water end gas chamber, the pressure for measuring raw water end gas chamber；And it will survey
The pressure signal measured is changed into electric signal；
The data acquisition unit is connected with the pressure sensor, the pressure detected for acquiring the pressure sensor
Electric signal；
The data record unit is connected with the data acquisition unit, and the data record unit is for recording described in preservation
The collected electric pressure signal data of data acquisition unit.
2. pressure-detecting device as described in claim 1, which is characterized in that it is nitrogen cylinder or air that the gas, which provides unit,
Bottle.
3. pressure-detecting device as described in claim 1, which is characterized in that the data acquisition unit sampling per second is at least
100 points.
4. pressure-detecting device as described in claim 1, which is characterized in that the pressure-detecting device further includes the first ball
Valve, first ball valve are set to the gas and provide between unit and the ultrafiltration film unit, and first ball valve is for cutting
The pressure that the disconnected gas is provided between unit and the ultrafiltration film unit contacts.
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| CN201820439950.8U CN207937324U (en) | 2018-03-30 | 2018-03-30 | A kind of pressure-detecting device of integrity of ultrafiltration membrane for identification |
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|---|---|---|---|
| CN201820439950.8U CN207937324U (en) | 2018-03-30 | 2018-03-30 | A kind of pressure-detecting device of integrity of ultrafiltration membrane for identification |
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| CN207937324U true CN207937324U (en) | 2018-10-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507924A (en) * | 2018-03-30 | 2018-09-07 | 华中科技大学 | A kind of integrity of ultrafiltration membrane recognition methods and device |
| CN109443996A (en) * | 2018-12-17 | 2019-03-08 | 重庆大学 | Film is impregnated with the device and method of pressure value during a kind of Sensitive Detection membrane distillation |
| CN114307662A (en) * | 2021-12-30 | 2022-04-12 | 江苏汉邦科技有限公司 | Filter element filter membrane integrity testing device |
| CN114403521A (en) * | 2022-01-04 | 2022-04-29 | 王书珍 | Protective clothing and damage detection method thereof |
| CN114405283A (en) * | 2021-12-30 | 2022-04-29 | 武汉艾科滤膜技术有限公司 | Water film generation device for ultrafiltration membrane integrity diagnosis |
| CN114858650A (en) * | 2022-05-17 | 2022-08-05 | 合肥檀泰环保科技有限公司 | Filter membrane breakage detection device in filter |
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2018
- 2018-03-30 CN CN201820439950.8U patent/CN207937324U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507924A (en) * | 2018-03-30 | 2018-09-07 | 华中科技大学 | A kind of integrity of ultrafiltration membrane recognition methods and device |
| CN108507924B (en) * | 2018-03-30 | 2023-08-04 | 华中科技大学 | Ultrafiltration membrane integrity recognition method and device |
| CN109443996A (en) * | 2018-12-17 | 2019-03-08 | 重庆大学 | Film is impregnated with the device and method of pressure value during a kind of Sensitive Detection membrane distillation |
| CN109443996B (en) * | 2018-12-17 | 2021-07-02 | 重庆大学 | Device and method for sensitively detecting membrane permeation pressure value in membrane distillation process |
| CN114307662A (en) * | 2021-12-30 | 2022-04-12 | 江苏汉邦科技有限公司 | Filter element filter membrane integrity testing device |
| CN114405283A (en) * | 2021-12-30 | 2022-04-29 | 武汉艾科滤膜技术有限公司 | Water film generation device for ultrafiltration membrane integrity diagnosis |
| CN114403521A (en) * | 2022-01-04 | 2022-04-29 | 王书珍 | Protective clothing and damage detection method thereof |
| CN114403521B (en) * | 2022-01-04 | 2023-12-22 | 东莞市昌启自动化科技有限公司 | Protective clothing and damage detection method thereof |
| CN114858650A (en) * | 2022-05-17 | 2022-08-05 | 合肥檀泰环保科技有限公司 | Filter membrane breakage detection device in filter |
| CN114858650B (en) * | 2022-05-17 | 2023-10-17 | 合肥檀泰环保科技有限公司 | Filter membrane breakage detection device in filter |
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