CN111013395A - Filter membrane front end pressure control method and filter membrane aperture testing device - Google Patents
Filter membrane front end pressure control method and filter membrane aperture testing device Download PDFInfo
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- CN111013395A CN111013395A CN202010133073.3A CN202010133073A CN111013395A CN 111013395 A CN111013395 A CN 111013395A CN 202010133073 A CN202010133073 A CN 202010133073A CN 111013395 A CN111013395 A CN 111013395A
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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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Abstract
The invention provides a pressure control method for the front end of a filter membrane and a filter membrane aperture testing device, which can accurately control the pressure of the front end of the filter membrane through an automatic control pressure stabilizing valve, and can not influence the accuracy of the filter membrane aperture test even if a cavity at the front end of the filter membrane is slightly air-leaked; meanwhile, the high-pressure sensor and the low-pressure sensor are matched with each other, and the high-flow sensor and the low-flow sensor are used, so that the test result is more accurate.
Description
Technical Field
The invention relates to the field of filter membrane aperture analysis and test, in particular to a method and a device for testing the aperture of a filter membrane by gas-liquid displacement.
Background
After the capillary channel is soaked and filled by the soaking liquid, the soaking liquid climbs a certain height along the wall of the pore due to the existence of capillary phenomenon and surface tension, and the pressure difference P formed by the height and the pore diameter D meet the Washburn formula: p =4cos θ γ/D, where θ is the contact angle of the immersion liquid with the pore walls and γ is the surface tension between the immersion liquid and the displacement gas. Taking a certain membrane material as an example, the membrane is fully wetted by a liquid capable of infiltrating with the membrane, and the infiltrating liquid is bound in pores of the membrane due to the existence of surface tension; gradually increasing gas pressure is applied to one side of the membrane, and when the gas pressure reaches a pressure greater than that generated by the surface tension of the immersion liquid in a certain aperture, the immersion liquid in the aperture is pushed out by the gas; since the smaller the pore diameter is, the higher the pressure generated by surface tension is, the higher the gas pressure to be applied for pushing out the impregnating solution therein is; similarly, it can be seen that the immersion liquid in the hole with the largest aperture is firstly pushed out to allow the gas to permeate, and then as the pressure increases, the aperture is gradually pushed out from large to small to allow the gas to permeate until all the holes are opened, so as to achieve the same permeability as that of the dry film. After the holes are opened, gas will flow through the holes, and a flow sensor is placed behind the membrane to monitor the flow of gas through the membrane. The diameter of the pores of the membrane and the number of diameters are calculated from the relationship of pressure and flow in real time.
Disclosure of Invention
According to the principle, the pressure control method for the front end of the filter membrane provided by the invention comprises the following steps: an automatic control system and an automatic adjustable pressure stabilizing valve.
The automatic control system is connected with the automatic adjustable pressure stabilizing valve through a circuit, the automatic control system sends an instruction to the automatic adjustable pressure stabilizing valve, and the automatic adjustable pressure stabilizing valve receives the instruction and then controls the outlet pressure of the automatic adjustable pressure stabilizing valve to rise in a stepped mode.
Furthermore, the present invention provides a filter membrane pore size testing apparatus, comprising: the device comprises an automatic control system, an automatic adjustable pressure stabilizing valve, a low pressure sensor protecting valve, a high pressure sensor, a low flow sensor protecting valve and a high flow sensor.
And the automatic control system is in circuit connection with the low-pressure sensor, the low-pressure sensor protection valve, the high-pressure sensor, the low-flow sensor protection valve and the high-flow sensor.
The low-pressure sensor is connected with the cavity at the front end of the filter membrane through the low-pressure sensor protection valve; and the air inlet of the low-pressure sensor protection valve is connected with the cavity at the front end of the filter membrane, and the air outlet of the low-pressure sensor protection valve is connected with the low-pressure sensor.
The high pressure sensor is connected with the cavity gas circuit at the front end of the filter membrane.
The low-flow sensor is connected with the cavity at the rear end of the filter membrane through the low-flow sensor protection valve; the air inlet of the low-flow sensor protection valve is connected with the cavity at the rear end of the filter membrane, and the air outlet of the low-flow sensor protection valve is connected with the low-flow sensor.
And the high-flow sensor is connected with a cavity gas circuit at the rear end of the filter membrane.
The pressure control method for the front end of the filter membrane and the device for testing the aperture of the filter membrane have the advantages that the pressure of the front end of the filter membrane can be accurately controlled, and the accuracy of the aperture test of the filter membrane cannot be influenced even if a cavity at the front end of the filter membrane is slightly air-leaked; meanwhile, the high-pressure sensor and the low-pressure sensor are matched with each other, and the high-flow sensor and the low-flow sensor are used, so that the test result is more accurate.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a filter membrane pore size testing device;
in the figure, 1, an automatic control system, 2, a steel cylinder, 3, an automatic regulating pressure stabilizing valve, 4, a low-pressure sensor, 5, a low-pressure sensor protecting valve, 6, a high-pressure sensor, 7, a test fixture, 8, a filter membrane, 9, a low-flow sensor, 10, a low-flow sensor protecting valve and 11, a high-flow sensor are arranged.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in 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 embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a pressure control method for the front end of a filter membrane, which comprises an automatic control system 1 and an automatic adjustable pressure stabilizing valve 3, wherein the automatic control system 1 is in circuit connection with the automatic adjustable pressure stabilizing valve 3, an air inlet of the automatic adjustable pressure stabilizing valve 3 is connected with a steel cylinder 2, and an air outlet of the automatic adjustable pressure stabilizing valve 3 is connected with a cavity at the front end of the filter membrane 8, the automatic control system 1 sends an instruction to the automatic adjustable pressure stabilizing valve 3, the automatic adjustable pressure stabilizing valve 3 increases the pressure in the cavity at the front end of the filter membrane according to the increase of ▽ P each time after receiving the instruction, the automatic adjustable pressure stabilizing valve 3 enables the pressure in the cavity at the front end of the filter membrane 8 to be at a stable value, and the internal pressure of the cavity cannot change even if the cavity has a slight air leakage condition.
The invention provides a filter membrane pore size testing device, which comprises: the automatic control system comprises an automatic control system 1, an automatic adjustable pressure maintaining valve 3, a low pressure sensor 4, a low pressure sensor protection valve 5, a high pressure sensor 6, a low flow sensor 9, a low flow sensor protection valve 10 and a high flow sensor 11.
The automatic control system 1 is in circuit connection with the low-pressure sensor 4, the low-pressure sensor protection valve 5, the high-pressure sensor 6, the low-flow sensor 9, the low-flow sensor protection valve 10 and the high-flow sensor 11, and the automatic control system 1 controls the actions of the hardware by sending different commands.
The low-pressure sensor 4 is connected with the cavity at the front end of the filter membrane 8 through the low-pressure sensor protection valve 5; the air inlet of the low-pressure sensor protection valve 5 is connected with the cavity at the front end of the filter membrane 8, and the air outlet of the low-pressure sensor protection valve is connected with the low-pressure sensor 4; the high pressure sensor 6 is connected with a cavity at the front end of the filter membrane 8 through a gas circuit. When the pressure in the cavity at the front end of the filter membrane 8 is small, the automatic control system 1 controls the low-pressure sensor protection valve 5 to be opened, and at the moment, the low-pressure sensor 4 tests the pressure at the front end of the filter membrane 8 and transmits a test value to the automatic control system 1. When the pressure at the front end of the filter membrane 8 is higher, the automatic control system 1 controls the low-pressure sensor protection valve 5 to be closed, and at the moment, the high-pressure sensor 6 tests the pressure at the front end of the filter membrane 8 and transmits the test value to the automatic control system 1.
The low-flow sensor 9 is connected with a cavity at the rear end of the filter membrane 8 through the low-flow sensor protection valve 10; the air inlet of the low-flow sensor protection valve 10 is connected with the cavity at the rear end of the filter membrane 8, and the air outlet of the low-flow sensor protection valve is connected with the low-flow sensor 9. And the high-flow sensor 11 is connected with a cavity gas circuit at the rear end of the filter membrane 8. When the pressure at the rear end of the filter membrane 8 is small, the automatic control system 1 controls the low-flow sensor protection valve 10 to be opened, and at the moment, the low-flow sensor 9 tests the flow at the rear end of the filter membrane 8 and transmits the test value to the automatic control system 1. When the flow at the rear end of the filter membrane 8 is large, the automatic control system 1 controls the low-flow sensor protection valve 10 to be closed, and at the moment, the high-flow sensor 11 tests the flow at the rear end of the filter membrane 8 and transmits the test value to the automatic control system 1.
When the automatic control system works, the automatic control system 1 controls the automatic adjustable pressure stabilizing valve 3 to work, the automatic adjustable pressure stabilizing valve 3 controls gas in the steel cylinder 2 to enter a cavity at the front end of the filter membrane 8, so that the pressure in the cavity is increased in a step-shaped manner by ▽ P each time, the impregnating solution in the hole of the filter membrane 8 is discharged along with the increase of the pressure in the cavity at the front end of the filter membrane 8, the gas flows out of the hole of the filter membrane 8, at the moment, the low-pressure sensor 4 tests the pressure in the cavity at the front end of the filter membrane 8, then the automatic control system 1 calculates the hole diameter according to the Washburn formula, P =4cos theta gamma/D (P is the pressure, D is the hole diameter, theta is the contact angle between the impregnating solution and the hole wall, gamma is the surface tension between the impregnating solution and the displacement gas), meanwhile, the low-flow sensor 9 tests the flow at the rear end of the filter membrane 8 to calculate the number of the hole diameters under the pressure, the hole diameters are gradually increased along with the increase of the pressure in the cavity at the front end of the filter membrane 8 and the flow of the high-pressure sensor and the high-pressure sensor 11, and the flow sensor are automatically measured by the high-pressure sensor 11.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (6)
1. The pressure control method for the front end of the filter membrane comprises the following steps: an automatic control system and an automatic adjustable pressure stabilizing valve; the automatic control system is connected with the automatic adjustable pressure stabilizing valve through a circuit, the automatic control system sends an instruction to the automatic adjustable pressure stabilizing valve, and the automatic adjustable pressure stabilizing valve receives the instruction and then controls the outlet pressure of the automatic adjustable pressure stabilizing valve to rise in a stepped mode.
2. The pressure control method for the front end of the filter membrane as recited in claim 1, wherein the automatic control system controls the pressure in the outlet of the automatic adjustable pressure stabilizing valve, namely the cavity of the front end of the filter membrane, to be increased by ▽ P every time, and the ▽ P can be set before testing.
3. The method for controlling the pressure at the front end of a filter membrane as recited in claim 1, wherein the pressure in the cavity of the filter membrane at the front end is regulated by the automatic pressure regulating and stabilizing valve to be stable, and the pressure in the cavity is not reduced due to micro-air leakage of the cavity.
4. The filter membrane aperture testing device comprises an automatic control system, an automatic adjustable pressure stabilizing valve, a low pressure sensor protection valve, a high pressure sensor, a low flow sensor protection valve and a high flow sensor; the automatic control system is in circuit connection with the low-pressure sensor, the low-pressure sensor protection valve, the high-pressure sensor, the low-flow sensor protection valve and the high-flow sensor; the low-pressure sensor is connected with the cavity at the front end of the filter membrane through the low-pressure sensor protection valve; the high pressure sensor is connected with a cavity gas circuit at the front end of the filter membrane; the low-flow sensor is connected with the cavity at the rear end of the filter membrane through the low-flow sensor protection valve; and the high-flow sensor is connected with a cavity gas circuit at the rear end of the filter membrane.
5. The filter membrane aperture testing device of claim 4, wherein the air inlet of the low pressure sensor protection valve is connected with the cavity at the front end of the filter membrane, and the air outlet thereof is connected with the low pressure sensor.
6. The filter membrane pore size testing device of claim 4, wherein the air inlet of the low-flow sensor protection valve is connected with the cavity at the rear end of the filter membrane, and the air outlet of the low-flow sensor protection valve is connected with the low-flow sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133073.3A CN111013395A (en) | 2020-03-01 | 2020-03-01 | Filter membrane front end pressure control method and filter membrane aperture testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010133073.3A CN111013395A (en) | 2020-03-01 | 2020-03-01 | Filter membrane front end pressure control method and filter membrane aperture testing device |
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| Publication Number | Publication Date |
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| CN111013395A true CN111013395A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010133073.3A Withdrawn CN111013395A (en) | 2020-03-01 | 2020-03-01 | Filter membrane front end pressure control method and filter membrane aperture testing device |
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| CN (1) | CN111013395A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5425265A (en) * | 1993-12-20 | 1995-06-20 | Jaisinghani; Rajan A. | Apparatus and method for measuring the capillary pressure distribution of porous materials |
| WO2004086008A1 (en) * | 2003-03-24 | 2004-10-07 | Ngk Insulators Ltd. | Method for measuring pore size of porous filter material |
| CN102151487A (en) * | 2011-01-12 | 2011-08-17 | 宁波大学 | Full-automatic ultrafiltration membrane pore size distribution determining instrument and automatic determining method thereof |
| CN103025409A (en) * | 2010-08-11 | 2013-04-03 | 甘布罗伦迪亚股份公司 | Device and process for testing hollow fibre membrane filters |
| CN205796980U (en) * | 2016-06-16 | 2016-12-14 | 兰州交通大学 | A kind of device measuring ion exchange membrane pore size and pore size distribution |
| CN205880066U (en) * | 2016-06-14 | 2017-01-11 | 兰州交通大学 | A device for determining amberplex aperture surface zeta current potential |
| CN208313769U (en) * | 2018-03-22 | 2019-01-01 | 贝士德仪器科技(北京)有限公司 | A kind of filter sizes analyzer with double pressure and two-flow test gas circuit structure |
| CN211886273U (en) * | 2020-03-01 | 2020-11-10 | 贝士德仪器科技(北京)有限公司 | Gas-liquid displacement test filter membrane aperture analyzer |
-
2020
- 2020-03-01 CN CN202010133073.3A patent/CN111013395A/en not_active Withdrawn
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5425265A (en) * | 1993-12-20 | 1995-06-20 | Jaisinghani; Rajan A. | Apparatus and method for measuring the capillary pressure distribution of porous materials |
| WO2004086008A1 (en) * | 2003-03-24 | 2004-10-07 | Ngk Insulators Ltd. | Method for measuring pore size of porous filter material |
| CN103025409A (en) * | 2010-08-11 | 2013-04-03 | 甘布罗伦迪亚股份公司 | Device and process for testing hollow fibre membrane filters |
| CN102151487A (en) * | 2011-01-12 | 2011-08-17 | 宁波大学 | Full-automatic ultrafiltration membrane pore size distribution determining instrument and automatic determining method thereof |
| CN205880066U (en) * | 2016-06-14 | 2017-01-11 | 兰州交通大学 | A device for determining amberplex aperture surface zeta current potential |
| CN205796980U (en) * | 2016-06-16 | 2016-12-14 | 兰州交通大学 | A kind of device measuring ion exchange membrane pore size and pore size distribution |
| CN208313769U (en) * | 2018-03-22 | 2019-01-01 | 贝士德仪器科技(北京)有限公司 | A kind of filter sizes analyzer with double pressure and two-flow test gas circuit structure |
| CN211886273U (en) * | 2020-03-01 | 2020-11-10 | 贝士德仪器科技(北京)有限公司 | Gas-liquid displacement test filter membrane aperture analyzer |
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Application publication date: 20200417 |
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| WW01 | Invention patent application withdrawn after publication |