CN112774456A - Gas detection device and method for ultrafiltration membrane - Google Patents
Gas detection device and method for ultrafiltration membrane Download PDFInfo
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- CN112774456A CN112774456A CN202011503861.3A CN202011503861A CN112774456A CN 112774456 A CN112774456 A CN 112774456A CN 202011503861 A CN202011503861 A CN 202011503861A CN 112774456 A CN112774456 A CN 112774456A
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- 238000001514 detection method Methods 0.000 title claims abstract description 61
- 239000012528 membrane Substances 0.000 title claims abstract description 46
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims description 16
- 230000001105 regulatory effect Effects 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 6
- 230000008054 signal transmission Effects 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
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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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- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a gas detection device and a gas detection method for an ultrafiltration membrane, the gas detection device comprises a membrane assembly to be detected, a control unit, a first relay, a second relay, a gas supply unit, a gas inlet control valve, a pressure transmitter and a pressure relief control valve, wherein a gas outlet of the gas supply unit is communicated with the membrane assembly to be detected through the gas inlet control valve, a pipeline of the gas inlet control valve and a pipeline of the membrane assembly to be detected are communicated with the pressure relief control valve, the first relay and the second relay are both electrically connected with the control unit, the first relay is used for controlling the start and stop of the gas inlet control valve, the second relay is used for controlling the start and stop of the pressure relief control valve, the pressure transmitter is electrically connected, the air inlet control valve and the air discharge control valve are respectively controlled through the first relay and the second relay to achieve the purpose of air detection, and errors of manual operation can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of ultrafiltration membrane production equipment, in particular to a gas detection device and a gas detection method for an ultrafiltration membrane.
Background
During the production process of the ultrafiltration membrane, gas detection is an important detection process, a common detection method is that compressed air with certain pressure is used for carrying out pressurization detection on a detected membrane module cavity, after the pressure is stable and reaches the standard, a valve of the compressed air is closed, pressure maintaining test is carried out, if the pressure is stable, the sealing performance is good, and if the pressure is reduced, the phenomenon of gas leakage is proved.
The current detection process mostly adopts manual detection, the manual valve opening and closing operation is required to be frequently carried out, and the workload is large; when products of different specifications are detected, detection pressure needs to be adjusted, the pressure maintaining time in the detection process is easy to be inconsistent due to manual factors, the quality and the quantity of the products cannot be guaranteed in the detection process, and potential safety hazards are buried in the quality detection of the products.
Disclosure of Invention
In view of the above, the present invention provides a gas detection apparatus and a gas detection method for an ultrafiltration membrane, which can standardize a gas detection process.
The technical scheme of the invention is realized as follows: the invention provides a gas detection device for an ultrafiltration membrane, which comprises a membrane assembly to be detected, a control unit, a first relay, a second relay, a gas supply unit, a gas inlet control valve, a pressure transmitter and a pressure relief control valve, wherein a gas outlet of the gas supply unit is communicated with the membrane assembly to be detected through the gas inlet control valve, a pipeline of the gas inlet control valve and a pipeline of the membrane assembly to be detected are communicated with the pressure relief control valve, the first relay and the second relay are electrically connected with the control unit, the first relay is used for controlling the start and stop of the gas inlet control valve, the second relay is used for controlling the start and stop of the pressure relief control valve, and the pressure transmitter is electrically connected.
On the basis of the above technical solution, preferably, the mobile terminal further includes a signal input unit, and the signal input unit is electrically connected with the control unit.
On the basis of the above technical solution, preferably, the signal input unit is one or a combination of a touch screen and a keyboard.
On the basis of the above technical solution, it is preferable that the air supply device further includes a regulating valve, and the air supply unit communicates with the air intake control valve through the regulating valve.
Still more preferably, the gas pressure control device further comprises a gas pressure switch, the gas pressure switch is arranged on a pipeline between the regulating valve and the gas inlet control valve, and the gas pressure switch is electrically connected with the control unit.
On the basis of the above technical solution, preferably, the electronic device further comprises an alarm unit, and the alarm unit is electrically connected with the control unit.
On the basis of the technical scheme, the detection device preferably further comprises a mechanical pressure gauge, and the mechanical pressure gauge is installed on a pipeline between the air inlet control valve and the membrane assembly to be detected.
On the basis of the technical scheme, the power supply circuit breaker, the start-stop switch and the alternating current direct current inverter are preferably further included, the power supply circuit breaker is electrically connected with the alternating current direct current inverter through the start-stop switch, the power supply circuit breaker is electrically connected with an external power supply, and the alternating current direct current inverter is electrically connected with the control unit, the first relay and the second relay respectively.
The invention also provides an air detection method based on the air detection device, which comprises the following steps:
step one, inputting an upper pressure limit value P through a signal input unitmaxLower limit of pressure PminSafety pressure value PSPressure maintaining time T1And time T of pressure release2The control unit obtains and stores the corresponding numerical value;
step two, connecting the membrane assembly to be detected to a gas outlet of a pipeline of the gas inlet control valve, starting a start-stop switch, enabling the first relay and the second relay to be in an off state, enabling the gas inlet control valve and the pressure relief control valve to be in an off state, enabling the gas pressure switch to obtain a pressure value P in the pipeline and send a corresponding pressure signal to the control unit, enabling the control unit to obtain the pressure signal and convert the pressure signal into a pressure value P, and enabling the pressure value P and the pressure value P to be comparedSFor comparison, when P > PSWhen the pressure switch is closed, the control unit controls the alarm unit to give an alarm, and when P is less than PSThen, entering the third step;
step three, the control unit controls the first relay to be closed, so that the air inlet control valve is opened, the pressure transmitter acquires a pressure value P1 in the pipeline and sends a corresponding pressure signal to the control unit, and the control unit can acquire a pressure value P1 and sends P1 and P to the control unitmaxAnd PminBy comparison, when P1 > PmaxOr P1 < PminWhile keeping the first relay active and selectively adjusting the regulating valve, thereby changing P1, when Pmin＜P1＜PmaxThen, entering the step four;
step four, the control unit controls the first relay to be disconnected, so that the air inlet control valve is closed, and pressure maintaining treatment T is carried out1Time and determine whether P1 is less than PminWhen P1 < PminIf the gas detection is not qualified, the control unit controls the alarm unit to alarm, and when T is reached1Within time, Pmin＜P1＜PmaxThe control unit controls the second relay to be closed, so that the pressure relief control valve is opened, and the pressure relief process T is carried out2Time, the pressure relief is finished, and the step five is entered;
and step five, the control unit controls the first relay to be disconnected, the second relay to be disconnected, and the start-stop switch is automatically reset and closed to wait for the next operation.
On the basis of the above technical solution, preferably, in the second step, when P > PSThe method also comprises the step of adjusting the pressure of the pipeline through an adjusting valve.
In addition to the above, it is preferable that both the intake control valve 6 and the pressure relief control valve 8 be in the closed state when both the first relay and the second relay are off.
Compared with the prior art, the gas detection device and the gas detection method for the ultrafiltration membrane have the following beneficial effects:
(1) the invention provides a more automatic device for monitoring and controlling the gas detection process of an ultrafiltration membrane, which can effectively avoid the problem that the gas detection time length, pressure and the like do not reach the standard caused by manual operation;
(2) the gas detection device is also provided with a corresponding alarm device and a corresponding signal input device which are respectively used for adjusting alarm and gas detection parameters;
(3) in order to prevent the detection device and the corresponding control unit from generating errors in working, a mechanical pressure gauge is further arranged, so that an operator can conveniently observe and compare in real time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the connection relationship of the gas detection apparatus for an ultrafiltration membrane according to the present invention;
FIG. 2 is a flow chart of a gas detection method of the gas detection device for the ultrafiltration membrane of the present invention.
In the figure: the detection device comprises a film assembly to be detected 1, a control unit 2, a first relay 3, a second relay 4, an air supply unit 5, an air inlet control valve 6, a pressure transmitter 7, a pressure relief control valve 8, a signal input unit 9, a regulating valve 10, a gas pressure switch 11, an alarm unit 12, a mechanical pressure gauge 13, a power supply circuit breaker 14, a start-stop switch 15 and an alternating current direct current inverter 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1 and fig. 2, the gas detection device for an ultrafiltration membrane of the present invention comprises a membrane module 1 to be detected, a control unit 2, a first relay 3, a second relay 4, a gas supply unit 5, a gas inlet control valve 6, a pressure transmitter 7 and a pressure relief control valve 8, wherein the gas supply unit 5 is used for supplying gas for gas detection, the gas supply unit 5 may specifically adopt an air compressor or a high-pressure gas container, a gas outlet of the gas supply unit 5 is communicated with the gas inlet control valve 6 through a pipeline, an outlet of the gas inlet control valve 6 is selectively communicated with the membrane module 1 to be detected through the pressure transmitter 7, the pressure transmitter 7 is electrically connected with the control unit, the pipeline between the outlet of the gas inlet control valve 6 and the membrane module 1 to be detected is further communicated with the pressure relief control valve 8, and the control unit 2 is electrically connected with the gas inlet control valve, the control unit 2 is electrically connected to the pressure relief control valve 8 via the second relay 4.
In the above embodiment, the first relay 3 is used to control the opening and closing of the air inlet control valve 6, the second relay 4 is used to control the opening and closing of the pressure relief control valve 8, when the air inlet control valve 6 is opened and the pressure relief control valve 8 is closed, pressurization can be performed in the membrane module 1 to be detected, when both the two control valves are closed, a pressure maintaining test can be performed on the membrane module 1 to be detected, the pressure transmitter 7 is used to detect a pressure value in the membrane module 1 to be detected, and the control unit 2 is used to store an operation parameter and a detection comparison parameter.
In the specific embodiment, the device further comprises a signal input unit 9, and the signal input unit 9 is electrically connected with the control unit 2.
In the above embodiment, the signal input unit 9 is used to write and modify the preset parameters into the control unit 2, so that the gas detection device of the present invention can adapt to the gas detection of ultrafiltration membranes of continuous specifications.
In a specific embodiment, the signal input unit 9 is one or a combination of a touch screen and a keyboard.
In the specific embodiment, a regulating valve 10 is further included, and the air supply unit 5 communicates with the air intake control valve 6 through the regulating valve 10.
In the above embodiment, the adjusting valve 10 is used to adjust the pressure value of the gas supplied by the gas supply unit 5, so as to adapt to gas detection, and avoid the excessive gas supply pressure of the gas supply unit 5 from being unsuitable for gas tightness detection.
In the specific embodiment, a gas pressure switch 11 is further included, the gas pressure switch 11 is installed on a pipeline between the regulating valve 10 and the air intake control valve 6, and the gas pressure switch 11 is electrically connected to the control unit 2.
In the above embodiment, the gas pressure switch 11 can detect the pressure in the pipeline between the regulating valve 10 and the air intake control valve 6, and can also play a role in protection, and by setting a safety threshold in the control unit 2, the control gas pressure switch 11 can open and close the pipeline between the regulating valve 10 and the air intake control valve 6, so as to avoid damage to the air intake control valve 6 and other related equipment due to excessive pressure.
In the specific embodiment, the device further comprises an alarm unit 12, and the alarm unit 12 is electrically connected with the control unit 2.
In the above embodiment, the alarm unit 12 is used to give an alarm, thereby prompting the operator to perform a corresponding operation.
In a specific embodiment, the device further comprises a mechanical pressure gauge 13, and the mechanical pressure gauge 13 is installed on a pipeline between the air inlet control valve 6 and the membrane assembly 1 to be detected.
In the above embodiment, the mechanical pressure gauge 13 is used for providing an intuitive pressure detection value, so that an operator can conveniently observe in real time, and inaccurate detection caused by the fault of the control unit 2 is avoided.
In a specific embodiment, the power supply system further comprises a power circuit breaker 14, a start-stop switch 15 and an ac-dc inverter 16, wherein the power circuit breaker 14 is electrically intercepted by the start-stop switch 15 and the ac-dc inverter 16, the power circuit breaker 14 is electrically connected with an external power supply, and the ac-dc inverter 16 is electrically connected with the control unit 2, the first relay 3 and the second relay 4 respectively.
In the above embodiment, the power circuit breaker 14 is a master switch for controlling the circuit on/off of the whole apparatus, the on/off switch 15 is used for operating on/off, and the ac-dc inverter 16 is used for providing the available dc power for the circuit.
As shown in fig. 2, the gas detection method of the present invention includes the following steps:
step one, inputting an upper pressure limit value P through a signal input unit 9maxLower limit of pressure PminSafety pressure value PSPressure maintaining time T1And time T of pressure release2The control unit 2 obtains and stores the corresponding numerical value;
step two, connecting the membrane assembly 1 to be detected to the air inlet control valve 6On the gas outlet of pipeline, open start-stop switch 15, first relay 3 and second relay 4 are the off-state this moment, and it is closed state to advance air control valve 6 and pressure relief control valve 8, and gas pressure switch 11 obtains pipeline internal pressure value P and sends the pressure signal who corresponds to control unit 2, and control unit 2 acquires pressure signal and converts pressure value P into, with P and P pressure value PSFor comparison, when P > PSWhen the gas pressure switch 11 is closed, the control unit 2 controls the alarm unit 12 to give an alarm, and when P is less than PSThen, entering the third step;
step three, the control unit 2 controls the first relay 3 to be closed, so that the air inlet control valve 6 is opened, the pressure transmitter 7 acquires a pressure value P1 in the pipeline and sends a corresponding pressure signal to the control unit 2, and the control unit 2 can acquire a pressure value P1 and sends P1 and P to the control unit 2maxAnd PminBy comparison, when P1 > PmaxOr P1 < PminWhile keeping the first relay 3 active and selectively adjusting the regulating valve 10, so as to vary P1, when Pmin＜P1＜PmaxThen, entering the step four;
step four, the control unit 2 controls the first relay 3 to be disconnected, so that the air inlet control valve 6 is closed, and the pressure maintaining process T is carried out1Time and determine whether P1 is less than PminWhen P1 < PminIf the gas detection is not qualified, the control unit 2 controls the alarm unit 12 to give an alarm, and when T is reached1Within time, Pmin＜P1＜PmaxThe control unit 2 controls the second relay 4 to close, so that the pressure relief control valve 8 is opened, and the pressure relief process T is carried out2Time, the pressure relief is finished, and the step five is entered;
and step five, the control unit 2 controls the first relay 3 to be switched off, the second relay 4 to be switched off, and the start-stop switch 15 to be automatically reset and switched off to wait for the next operation.
In specific embodiments, step two is when P > PSThe pressure of the pipeline can be regulated by adjusting the valve 10.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A gas detection device for an ultrafiltration membrane comprises a membrane module (1) to be detected, and is characterized by also comprising a control unit (2), a first relay (3), a second relay (4) and a gas supply unit (5), air inlet control valve (6), pressure transmitter (7) and pressure relief control valve (8), the gas outlet of air feed unit (5) is through air inlet control valve (6) and wait to detect membrane module (1) intercommunication each other, air inlet control valve (6) and the pipeline of waiting to detect membrane module (1) are led to and are communicate each other with pressure relief control valve (8), first relay (3), second relay (4) all with the control unit (2) electric connection, first relay (3) are used for controlling opening of air inlet control valve (6) and stop, second relay (4) are used for controlling opening of pressure relief control valve (8) and stop, pressure transmitter (7) and the control unit (2) electric connection.
2. The gas detection apparatus for an ultrafiltration membrane according to claim 1, further comprising a signal input unit (9), wherein the signal input unit (9) is electrically connected with the control unit (2).
3. The gas detection apparatus for an ultrafiltration membrane according to claim 2, wherein the signal input unit (9) is one or a combination of a touch screen and a keyboard.
4. The gas detection apparatus for an ultrafiltration membrane according to claim 1, further comprising a regulating valve (10), wherein the gas supply unit (5) communicates with the gas inlet control valve (6) through the regulating valve (10).
5. The gas detection apparatus for an ultrafiltration membrane according to claim 4, further comprising a gas pressure switch (11), wherein the gas pressure switch (11) is installed on a pipeline between the regulating valve (10) and the gas inlet control valve (6), and the gas pressure switch (11) is electrically connected with the control unit (2).
6. The gas detection apparatus for ultrafiltration membranes according to claim 5, further comprising an alarm unit (12), wherein said alarm unit (12) is electrically connected to the control unit (2).
7. The gas detection device for the ultrafiltration membrane according to claim 1, further comprising a mechanical pressure gauge (13), wherein the mechanical pressure gauge (13) is installed on a pipeline between the gas inlet control valve (6) and the membrane module (1) to be detected.
8. The gas detection device for the ultrafiltration membrane, according to claim 1, further comprising a power breaker (14), a start-stop switch (15) and an ac-dc inverter (16), wherein the power breaker (14) is electrically connected with the ac-dc inverter (16) through the start-stop switch (15), the power breaker (14) is electrically connected with an external power supply, and the ac-dc inverter (16) is electrically connected with the control unit (2), the first relay (3) and the second relay (4), respectively.
9. A method of gas detection using a gas detection apparatus for an ultrafiltration membrane according to any one of claims 1 to 8, comprising the steps of:
step one, inputting an upper limit value P of pressure through a signal input unit (9)maxLower limit of pressure PminSafety pressure value PSPressure maintaining time T1And time T of pressure release2The control unit (2) obtains and stores the corresponding numerical value;
step two, to wait to detect that membrane module (1) is connected on the gas outlet of the pipeline of air admission control valve (6), open start-stop switch (15), first relay (3) and second relay (4) are off-state this moment, air admission control valve (6) and pressure relief control valve (8) are closed state, gas pressure switch (11) obtain pipeline internal pressure value P and with the pressure signal transmission who corresponds to control unit (2), control unit (2) acquire pressure signal and convert pressure value P into, with P and PSFor comparison, when P > PSWhen the gas pressure switch (11) is closed, the control unit (2) controls the alarm unit (12) to give an alarm, and when P is less than PSThen, entering the third step;
step three, the control unit (2) controls the first relay (3) to be closed, so that the air inlet control valve (6) is opened, the pressure transmitter (7) acquires a pressure value P1 in the pipeline and sends a corresponding pressure signal to the control unit (2), and the control unit (2) can acquire a pressure value P1 and sends P1 and P to the control unit (2)maxAnd PminBy comparison, when P1 > PmaxOr P1 < PminWhile keeping the first relay (3) active and selectively adjusting the regulating valve (10), so as to vary P1, when Pmin＜P1＜PmaxThen, entering the step four;
fourthly, the control unit (2) controls the first relay (3) to be disconnected, so that the air inlet control valve (6) is closed, and pressure maintaining treatment T is carried out1Time and determine whether P1 is less than PminWhen P1 < PminIf the gas detection is not qualified, the control unit (2) controls the alarm unit (12) to give an alarm, and when T is detected1Within time, Pmin＜P1＜PmaxThe control unit (2) controls the second relay (4) to be closed, so that the pressure relief control valve (8) is opened, and the pressure relief process T is carried out2Time, the pressure relief is finished, and the step five is entered;
and step five, the control unit (2) controls the first relay (3) to be disconnected, the second relay (4) to be disconnected, and the start-stop switch (15) is automatically reset and closed to wait for the next operation.
10. The method for gas detection in a gas detection apparatus for an ultrafiltration membrane of claim 9, wherein in step two, when P > PSThe method also comprises the step of regulating the pipeline pressure through a regulating valve (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011503861.3A CN112774456A (en) | 2020-12-18 | 2020-12-18 | Gas detection device and method for ultrafiltration membrane |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011503861.3A CN112774456A (en) | 2020-12-18 | 2020-12-18 | Gas detection device and method for ultrafiltration membrane |
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| CN202011503861.3A Pending CN112774456A (en) | 2020-12-18 | 2020-12-18 | Gas detection device and method for ultrafiltration membrane |
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Application publication date: 20210511 |