CN105841894B - A kind of detection method and detecting instrument of the airtight value of reverse-osmosis membrane element - Google Patents
A kind of detection method and detecting instrument of the airtight value of reverse-osmosis membrane element Download PDFInfo
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- CN105841894B CN105841894B CN201610172443.8A CN201610172443A CN105841894B CN 105841894 B CN105841894 B CN 105841894B CN 201610172443 A CN201610172443 A CN 201610172443A CN 105841894 B CN105841894 B CN 105841894B
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- 239000012528 membrane Substances 0.000 title claims abstract description 102
- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 35
- 238000001514 detection method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000007689 inspection Methods 0.000 claims description 24
- 238000012360 testing method Methods 0.000 claims description 11
- 238000012856 packing Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 230000002045 lasting effect Effects 0.000 claims description 3
- 238000012797 qualification Methods 0.000 claims description 3
- 230000002950 deficient Effects 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 4
- 150000003839 salts Chemical class 0.000 abstract description 3
- 238000009825 accumulation Methods 0.000 abstract description 2
- 230000004907 flux Effects 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 description 5
- 238000010612 desalination reaction Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses the detection method and detecting instrument of a kind of airtight value of reverse-osmosis membrane element, by the concept for introducing the airtight value of reverse-osmosis membrane element.The airtight value of membrane component is defined as, under specific atmospheric pressure value, the rate of decay of pressure in membrane component water bag.The rate of decay is exactly the function of time time differential of pressure mathematically.By measuring airtight value, to estimate the salt rejection rate of membrane component and flux and judge that tested membrane component is non-defective unit or defective products.Present invention reduces the labor intensity of operator, improve the measurement accuracy of air-tightness, and the historical data of the air-tightness of membrane component, product actual performance and the two correspondence has obtained effective accumulation, can also quantitatively estimate its actual performance.
Description
Technical field
The invention belongs to reverse-osmosis membrane element technical fields, and in particular to a kind of detection side of the airtight value of reverse-osmosis membrane element
Method and detecting instrument.
Background technology
Reverse-osmosis membrane element production firm, the reverse-osmosis membrane element produced for oneself can not accomplish each all
The properties of product such as its salt rejection rate and production water flow are measured by hydraulic pressure test.
It is more often to judge the airtight of the membrane component by applying positive and negative air-pressure to a reverse-osmosis membrane element
Performance, and then judge that membrane component is non-defective unit or defective products.
This just needs to use the airtight value measuring instrument of reverse-osmosis membrane element.
Before this, can't a stable exact value directly be obtained by measurement to reflect reverse-osmosis membrane element in industry
Air-tightness, can only obtain one it is related with membrane component air-tightness, but uncertain factor is far-reaching in by measuring environment
One value is traditionally called " pressure inspection value ".
Universal scheme is as follows：
The air source of vacuum or compressed air is connected to by solenoid valve and pressure inspection head on the collector pipe of reverse-osmosis membrane element,
Thief hole is done on pipeline between solenoid valve and collector pipe, and pressure transmitter is installed on the thief hole.
Pressure value signal can be transferred to pressure digital display meter by pressure transmitter, and qualified pressure inspection value can be inputted in digital display meter,
And in real time compare the value of input and measured pressure, comparison result is then exported in the form of switching value.
Schematic diagram is shown in Fig. 1；During work, solenoid valve is opened to membrane component water bag pressure by an external switch or is inhaled negative
Pressure, after pressure reaches setting value, makes membrane component water bag enter packing state by turning off solenoid valve.
After dwell time of setting reaches, reading just arrives to the pressure value of dwell time at that moment, and digital display meter is to switch
The comparison result of amount form output.
If less than the qualified pressure inspection value of setting, alarm lights alarm, and representative is defective products.
If more than the qualified pressure inspection value of setting, alarm, which is lighted, does not alarm, and representative is non-defective unit.
Operator reads the digital display meter at that moment that alarm is lighted and shows pressure value, i.e., above-mentioned membrane component
" pressure inspection value ".
But it can be had the following problems in this course of work：
Solenoid valve obtains electric opening, and membrane component, which is pressed, reaches setup pressure value P0Afterwards, it cuts off the power, suppresses solenoid valve dead electricity
While, pressurize timing starts.
After suppressing solenoid valve dead electricity, in it under the action of the spring, taken by turning off about in 10-30 milliseconds
Afterwards, the shutdown of solenoid valve is completed.
During entire shutdown takes, positive or negative pressure continuous rise in reverse osmosis membrane water bag, the pressure finally obtained is most
Big value P.
The shutdown of solenoid valve takes, and is determined by the quality and newness degree of solenoid valve, is a uncertain factor, and pipeline
Interior trowel used for plastering, which blocks up, solenoid valve to be caused to be not closed completely.
So P values are uncertain, cause identical dwell time voltage drop value difference make same membrane component in different time or
Different detected values is obtained on distinct device.
Also, after the dwell time for reaching setting, operator will read alarm and light moment, the pressure that digital display meter is shown
Force value is as pressure inspection value.
But the registration of digital display meter changes always, different operation person, and different reflecting time reading numerical values are all different.
It results in needs and qualified pressure inspection value is continually inputted in digital display meter to be modified.
Meanwhile if applying positive pressure to membrane component water bag, can water bag be expanded.
In expansion process, surface desalination layer can squeeze raw water runner cloth.
Since desalination layer itself is very thin, generally there was only 200 nanometer thickness, so during it squeezes concentrated water runner cloth
Indentation Damage is easily caused, and then influences properties of product.
If membrane component is given to apply negative pressure, Remaining debris and uncured adhesive can enter equipment pipeline and true in membrane component
Acceleration equipment trowel used for plastering blocks up aging in empty machine, and operation deviation is caused to increase.
In addition, the pressure inspection value measured is related with membrane component air-tightness rather than completely by membrane component air-tightness
It determines.
It can only be used for qualitatively judging that it is non-defective unit or defective products to be detected membrane component which results in pressure inspection value, and cannot use
In the performance for quantitatively estimating detected membrane component.
Invention content
In order to overcome the drawbacks described above of the prior art, the present invention proposes a kind of inspection of the airtight value of completely new reverse-osmosis membrane element
Survey method and the detecting instrument for realizing the detection method can improve the measurement accuracy of membrane component air-tightness.
The principle on which of the present invention is：By practice and it has been observed that the uncertain factor in measuring environment can not
Removal.
In consideration of it, we look for another way, the pressure inspection value of membrane component is no longer measured, then it is airtight to propose reverse-osmosis membrane element
The concept of value.
The airtight value of membrane component is defined as, under specific atmospheric pressure value, the rate of decay of pressure in membrane component water bag.
The rate of decay is exactly the function of time time differential of pressure mathematically.
Its mathematic(al) representation is as follows：
By measuring airtight value, come estimate the salt rejection rate of membrane component and flux and judge tested membrane component be non-defective unit or
Defective products.
For calculating and the convenience of display, can not consider the negative sign before pressure value, be considered as positive value calculating and
Display.
Hinder desalination layer in view of beating positive pressure to membrane component water bag and be easy to causeing raw water runner cloth and press against, we are applied with vacuum equipment
Add negative pressure.
The detection method of the airtight value of reverse-osmosis membrane element is provided first, is included the following steps：
（1）, select the reverse-osmosis membrane element of certain model air-tightness qualification, vacuum equipment is connected to membrane component by valve
Collector pipe establish vacuum system, negative pressure test is beaten repeatedly, so as to obtain a certain suppressing stop value P1Lower membrane component water bag
The function curve of interior Pressure versus Time, and above-mentioned curve is divided by lasting ramp-up period, sharp-decay stage according to curve trend
And normal attenuation region three phases；
（2）, in detection pressure value p of a certain pressure value of normal attenuation regional choice as the airtight value of reverse-osmosis membrane element0,
And further determine that the airtight value a of standard of pressure in the membrane component water bag under the pressure value0；The airtight value is defined as：
Under specific atmospheric pressure value, the rate of decay of pressure, mathematic(al) representation are in membrane component water bag：；
（3）, collector pipe that vacuum equipment connected to membrane component membrane component to be detected by valve establish vacuum system, then
Progress vacuum pumping to pressure, which reaches, suppresses stop value P1；
（4）, close vacuum equipment valve enter packing state；
（5）, be reduced to detection pressure value p when the vacuum degree of vacuum system0When, measure the pressure value P0Lower membrane component water bag
The airtight value a of reality of interior pressure1；It and will practical airtight value a1With the airtight value a of standard0It compares, if practical airtight value a1It is more than
The airtight value a of standard0, then the film original paper air-tightness is unqualified, on the contrary then qualified.
Said program can be more preferably：
The step（2）The detection pressure p of the middle airtight value of reverse-osmosis membrane element0Selection, which is located at, has just enter into normal attenuation region
Pressure value or the pressure value positioned at normal attenuation region leading portion region；It can thus reduce and suppress stop value and decay to spy
Level pressure force value P0Take, improve testing efficiency.
It was verified that the membrane component of different model has following characteristics：It is described to suppress stop value P1Absolute value it is usually big
In detection pressure value p0Absolute value.
But if pre-set detection pressure value p0As long as suppressing stop value can realize higher than some pressure value
Decline of pressure extremely detects pressure value p0When come into normal attenuation region, but suppress stop value should not set it is excessively high because
If the excessively high of stop value setting will be suppressed, it can extend and decay to particular pressure value P from suppressing stop value0Take, Jin Erying
Ring testing efficiency.
Such as we do it is following preferably：The reverse-osmosis membrane element model membrane component 1812-50 detects pressure value P 0
It is set as -70Kpa, suppresses stop value and be set as -73Kpa.
Secondly, a kind of detecting instrument for realizing above-mentioned detection method is provided, technical solution is as follows：Including by pipeline according to
Pressure inspection detector, filter, flowmeter, electric flow control valve and the vacuum pump of secondary connection, the electric flow control valve
The pipeline examined with pressure between detector is equipped with pressure transmitter, the pressure transmitter, electric flow control valve and flow
Meter is connect respectively by control circuit with programmable controller.
Preferably, the filter is disc type medium effeciency filter.
Preferably, the flow is calculated as gas vortex-shedding meter.
The present invention can be to avoid raw water runner cloth during positive pressure to the Indentation Damage of desalination layer, membrane element when also avoiding common negative pressure
Remaining debris and uncured adhesive enter equipment pipeline and vacuum machine in part, reduce the labor intensity of operator, improve
The measurement accuracy of air-tightness, and the historical data of the air-tightness of membrane component, product actual performance and the two correspondence
Effective accumulation has been obtained, can also quantitatively estimate its actual performance.
Description of the drawings
Fig. 1 is the testing principle schematic diagram of existing pressure inspection value；
Fig. 2 is the function curve of Pressure versus Time in membrane component water bag（Pressure takes absolute value）；
Fig. 3 is the connection diagram of air-leakage test instrument in the present invention.
Specific embodiment
Below in conjunction with specific embodiment, the present invention is described further, but not as a limitation of the invention.
Embodiment 1
A kind of detection method of the airtight value of reverse-osmosis membrane element, includes the following steps：
（1）, select the reverse-osmosis membrane element of certain model air-tightness qualification, vacuum equipment is connected to membrane component by valve
Collector pipe establish vacuum system, negative pressure test is beaten repeatedly, so as to obtain a certain suppressing stop value P1Lower membrane component water bag
The function curve of interior Pressure versus Time, and above-mentioned curve is divided by lasting ramp-up period, sharp-decay stage according to curve trend
And normal attenuation region three phases；Curve form is referring to Fig. 2；In figure continue ramp-up period pressure persistently increase, be due to
During the shutdown of valve takes, in reverse osmosis membrane water bag negative pressure can also continuous rise, the pressure maximum value finally obtained；Drastically
Decling phase pressure rapid decrease is after being closed due to valve, and each point pressure imbalance in space in reverse osmosis membrane water bag is led
It causes, the short time is needed to be rapidly achieved balance, i.e., each point pressure reaches consistent；Normal attenuation region, that is, the shakiness of front two
After determining factor removal, the attenuation of pressure is entirely determining for the air-tightness by membrane component in itself.
（2）, in detection pressure value p of a certain pressure value of normal attenuation regional choice as the airtight value of reverse-osmosis membrane element0,
And further determine that the airtight value a of standard of pressure in the membrane component water bag under the pressure value0；The airtight value is defined as：
Under specific atmospheric pressure value, the rate of decay of pressure, mathematic(al) representation are in membrane component water bag：；
（3）, collector pipe that vacuum equipment connected to membrane component membrane component to be detected by valve establish vacuum system, then
Progress vacuum pumping to pressure, which reaches, suppresses stop value P1；
（4）, close vacuum equipment valve enter packing state；
（5）, be reduced to detection pressure value p when the vacuum degree of vacuum system0When, measure the pressure value P0Lower membrane component water bag
The airtight value a of reality of interior pressure1；It and will practical airtight value a1With the airtight value a of standard0It compares, if practical airtight value a1It is more than
The airtight value a of standard0, then the film original paper air-tightness is unqualified, on the contrary then qualified.
Embodiment 2
Referring to Fig. 3, a kind of detecting instrument of the airtight value of reverse-osmosis membrane element, including passing through the sequentially connected pressure inspection inspection of pipeline
Gauge head, disc type medium effeciency filter, gas vortex-shedding meter, electric flow control valve and vacuum pump, electric flow control valve with
Pipeline between pressure inspection detector is equipped with pressure transmitter（Specifically be mounted on gas vortex-shedding meter with pressure inspection detector it
Between）, pressure transmitter, electric flow control valve and flowmeter are connect respectively by control circuit with programmable controller.
The effect of disc type medium effeciency filter is the fine debris and adhesive remnants filtered out in membrane component water bag.
Production water flow passage cloth inside membrane component water bag, some fine debris are inevitably adhered on surface.
These clasts can be drawn onto in pipeline during negative pressure is beaten.
The effect of gas vortex-shedding meter is to beat specific membrane component the flow velocity that negative pressure is gas by on-line checking, is come
The attenuation degree of indirect Measuring Vacuum vacuum capability and the chocking-up degree of pipeline.
The effect of electric flow control valve is, according to the flow velocity measured by gas vortex-shedding meter, by adjusting the phase is suppressed
Between valve opening size, to offset the blocking of the attenuation of vacuum pump vacuum capability and pipeline；Vacuum pumping can be controlled true
Empty speed is consistent, keeps after closing short solenoid valve, turns off during taking, negative pressure continuous rise in reverse osmosis membrane water bag, finally
Obtained pressure maximum value is basically identical.
Its work step is as follows：First open electric flow control valve, what pressure reached setting suppresses stop value, is then shut off
Electric flow control valve enters packing state.
Into after packing state, particular pressure value P is measured0Under membrane component water bag in pressure rate of decay a, then will
Its locking is shown on digital display meter, is read with the person of being conveniently operated.
By adjusting stop value is suppressed, to ensure that pressure decays to particular pressure value P in membrane component water bag0When,
It takes through having spent electromagnetism valve breakdown completely and takes this two sections of uncertain factors with pressure balance.
Ensured with this in particular pressure value P0Under, the rate of decay that measures（I.e. airtight value）Only by the airtight of membrane component itself
Performance influences.
The air-tightness measured in this way is not only accurate, but also measuring speed is fast, and normal attenuation is entered because once confirming
Its differential can be obtained in region immediately.
It does not need to continue for some time in normal attenuation region again, result can just be obtained.
As long as it is sufficiently large to suppress stop value, then has undergone obtained from electromagnetism valve breakdown takes and has suppressed maximum value with regard to enough
Greatly, then just undergone in the film that pressure balance takes pressure with regard to sufficiently large, then this pressure is ensured that more than specific
Pressure value P0。
And then it obtains in particular pressure value P0Under, the rate of decay measured is only influenced by the air-tightness of membrane component itself.
If the excessive of stop value setting will be suppressed, it can extend and decay to particular pressure value P from suppressing stop value0Consumption
When, and then influence testing efficiency.
So value also should not be too large.
Embodiment 3
The detecting instrument of 1 detection method and embodiment 2 in conjunction with the embodiments, below by taking membrane component 1812-50 as an example, to survey
Determine membrane component air-tightness.
First by 1 detection method of embodiment, the detection pressure value P 0 for determining membrane component 1812-50 is -70Kpa, is suppressed
Stop value is -73Kpa.
Secondly by 2 detecting instrument of embodiment, carry out air-leakage test to branched membrane component to be detected, and respectively with just
Pressure pressure inspection value mensuration and negative pressure pressure inspection value mensuration（Testing principle i.e. shown in FIG. 1）It is compared into row index, specific data
Such as following table：
| Detection method | Accuracy rate | Cause fraction defective | Detection rates | Performance compares accuracy rate |
| Positive pressure pressure inspection value measures | 92% | 2% | 6 seconds/ | ±10% |
| Negative pressure pressure inspection value measures | 92% | 0 | 6 seconds/ | ±10% |
| The airtight value of negative pressure measures | 98% | 0 | 4 seconds/ | ±5% |
By being compared in table as it can be seen that the detection efficiency and accuracy rate of the present invention is compared with prior art by significantly improving.
Claims (7)
1. a kind of detection method of the airtight value of reverse-osmosis membrane element, which is characterized in that include the following steps：
（1）, select the reverse-osmosis membrane element of certain model air-tightness qualification, vacuum equipment is connected to the collection of membrane component by valve
Water pipe establishes vacuum system, is beaten negative pressure test repeatedly, so as to obtain a certain suppressing stop value P1Lower membrane component water bag internal pressure
Power to the function curve of time, and according to curve trend by above-mentioned curve be divided into lasting ramp-up period, the sharp-decay stage and
Normal attenuation region three phases；
（2）, in detection pressure value p of a certain pressure value of normal attenuation regional choice as the airtight value of reverse-osmosis membrane element0, and
Further determine that the airtight value a of standard of pressure in the membrane component water bag under the pressure value0；The airtight value is defined as：Specific
Under atmospheric pressure value, the rate of decay of pressure, mathematic(al) representation are in membrane component water bag：；
（3）, collector pipe that vacuum equipment connected to membrane component to be detected by valve establish vacuum system, then vacuumized
Operation reaches to pressure suppresses stop value P1；
（4）, close vacuum equipment valve enter packing state；
（5）, be reduced to detection pressure value p when the vacuum degree of vacuum system0When, measure pressure value p0In lower membrane component water bag
The airtight value a of reality of pressure1；It and will practical airtight value a1With the airtight value a of standard0It compares, if practical airtight value a1More than standard
Airtight value a0, then the membrane component air-tightness is unqualified, on the contrary then qualified.
2. the detection method of the airtight value of reverse-osmosis membrane element according to claim 1, which is characterized in that the step（2）
The detection pressure p of the middle airtight value of reverse-osmosis membrane element0Selection, which is located at, has just enter into the pressure value in normal attenuation region or positioned at just
The pressure value in normal attenuation region leading portion region.
3. the detection method of the airtight value of reverse-osmosis membrane element according to claim 1, which is characterized in that described to suppress stopping
Value P1Absolute value be more than detection pressure value p0Absolute value.
4. according to the detection method of any airtight values of reverse-osmosis membrane element of claim 1-3, which is characterized in that described anti-
Permeable membrane device model membrane component 1812-50, detection pressure value p0It is set as -70Kpa, suppresses stop value setting
For -73Kpa.
5. the detecting instrument of the detection method of any airtight values of reverse-osmosis membrane element of claim 1-4 is used to implement, it is special
Sign is：Including passing through the sequentially connected pressure inspection detector of pipeline, filter, flowmeter, electric flow control valve and vacuum
Pump, the pipeline between the electric flow control valve and pressure inspection detector are equipped with pressure transmitter, the pressure transmitter, electricity
Dynamic flow control valve and flowmeter are connect respectively by control circuit with programmable controller.
6. detecting instrument according to claim 5, it is characterised in that：The filter is disc type medium effeciency filter.
7. detecting instrument according to claim 5 or 6, it is characterised in that：The flow is calculated as gas vortex-shedding meter.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106092467A (en) * | 2016-08-25 | 2016-11-09 | 珠海格力电器股份有限公司 | Testing device and testing method for RO (reverse osmosis) membrane filter element |
| CN107583467B (en) * | 2017-08-15 | 2019-10-22 | 深圳安吉尔饮水产业集团有限公司 | A kind of method and device for testing reverse osmosis membrane |
| CN109029865A (en) * | 2018-06-26 | 2018-12-18 | 佛山市麦克罗美的滤芯设备制造有限公司 | A kind of reverse-osmosis membrane element air-tightness detection device and test method |
| CN109621732A (en) * | 2018-12-12 | 2019-04-16 | 中海油天津化工研究设计院有限公司 | A kind of rapid detection method of molecular screen membrane |
| CN110887618A (en) * | 2019-11-28 | 2020-03-17 | 湖南沁森高科新材料有限公司 | System and method for testing air tightness of roll type membrane element |
| CN117782475A (en) * | 2020-11-30 | 2024-03-29 | 北京舍得叔叔科技有限公司 | Method and device for quantitatively monitoring airtight space air tightness by utilizing atmospheric pressure change |
| CN114544105A (en) * | 2022-02-22 | 2022-05-27 | 佛山市美的清湖净水设备有限公司 | Vacuum detection equipment, film element detection method and device thereof, and storage medium |
| CN114518206A (en) * | 2022-02-22 | 2022-05-20 | 佛山市美的清湖净水设备有限公司 | Membrane element air tightness detection system and detection method |
| CN114544115A (en) * | 2022-02-22 | 2022-05-27 | 佛山市美的清湖净水设备有限公司 | Membrane element vacuum detection equipment, control method and device thereof, and storage medium |
| CN114544104A (en) * | 2022-02-22 | 2022-05-27 | 佛山市美的清湖净水设备有限公司 | Vacuum detection equipment, membrane element detection method and device thereof, and storage medium |
| CN118883396B (en) * | 2024-09-30 | 2024-12-06 | 四川高路文化旅游发展有限责任公司 | A device and method for testing performance of basement anti-seepage materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1735730A1 (en) * | 1987-05-19 | 1992-05-23 | Всесоюзный Научно-Исследовательский Институт Винограда И Продуктов Его Переработки "Магарач" | Device foe testing semipermeable separating member state |
| JP2005091042A (en) * | 2003-09-12 | 2005-04-07 | Olympus Corp | Leak tester |
| JP2008241365A (en) * | 2007-03-26 | 2008-10-09 | Mitsui Eng & Shipbuild Co Ltd | Membrane monitoring method and membrane monitoring system |
| CN101329216A (en) * | 2008-08-01 | 2008-12-24 | 山东恒沣膜科技有限公司 | Reverse osmosis membrane element leak detection machine |
| CN203507833U (en) * | 2013-09-16 | 2014-04-02 | 沃德思源集团有限公司 | System for detecting airtightness of joint of reverse osmosis membrane and membrane shell |
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