CN103149140A - Porous media air permeability estimating device - Google Patents
Porous media air permeability estimating device Download PDFInfo
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- CN103149140A CN103149140A CN2013100573780A CN201310057378A CN103149140A CN 103149140 A CN103149140 A CN 103149140A CN 2013100573780 A CN2013100573780 A CN 2013100573780A CN 201310057378 A CN201310057378 A CN 201310057378A CN 103149140 A CN103149140 A CN 103149140A
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Abstract
The invention discloses a porous media air permeability estimating device which comprises a high-pressure air cylinder, a test specimen clamping assembly and a monitoring display, wherein the test specimen clamping assembly comprises an upper clamp and a lower clamp which are connected with each other and are hollow cylinder bodies communicated with each other; the joint of the upper clamp and the lower clamp is provided with a gasket, the top end of the upper clamp and the bottom end of the lower clamp are respectively provided with an upper air hole and a lower air hole, the upper air hole is connected with the high-pressure air cylinder through a first air pitometer, a pressure gage and a reducing valve successively, and the lower air hole is connected with the monitoring display through a second air pitometer and an air flow sensor successively. The porous media air permeability estimating device provided by the invention has the advantages that the operation is simple, the testing precision is high, the sealing effect is good, the purpose of testing porous media with different air permeability properties such as low permeability or high permeability in parallel is realized, test errors are greatly reduced, and the reliability and comparability of testing results are improved. The estimating device can be also used for estimating the air permeability of the porous media in a quantitative and qualitative manner.
Description
Technical field
The present invention relates to the porosint technical field of measurement and test, relate in particular to a kind of porous medium gas penetration potential apparatus for evaluating.
Background technology
The effectiveness of porous medium often relates to fluid mass-and heat-transfer process therein, such as the heat insulation foaming insulation board of the porous ceramics with oxidation catalyst filter function, thermal insulation, cement-based material of low-permeability etc., these materials are the core component of correlative technology field normally.So far, theoretical research about conductive process in porous medium emerges in an endless stream, how it is considered as continuous medium generally, transmission channel is considered as columniform capillary model, but in actual application, due to the pore structure of porous medium change difference greatly, problems such as boundary condition complexity between irregular, the fluid in interface and solid cause having relatively large deviation with the result of study of simplified model, and the device that is used at present this aspect test evaluation is also fewer, therefore, the easy gas permeability test device of research is necessary to the mass-transfer efficiency of assessment porous medium.
Existing porous medium gas penetration potential evaluation method mainly is divided into two kinds of malleation and negative pressure, the former is as the Cembureau method of RILEM promotion and the method for Wang Zhongping suggestion etc., the latter comprises method of testing that Torrent proposes, Figg method etc., the proposition of these test methods is mainly the porous medium for low-permeability, its input end pressure and gas flow rate when relatively low in test process, the flow of minimum gas is more difficult accurately to be recorded, and often causes the test findings distortion, and error is larger; In addition, for gas penetration potential porous medium preferably, as porous ceramics, expanded material etc., its ventilative grade often exceeds several even tens orders of magnitude, and when larger, the gas flow that sees through medium is larger when air-transmitting flow velocity and pressure, the test specimen sidewall becomes the passage of gas dissipation, will have a strong impact on test findings; Therefore, the high test unit of design good airproof performance measuring accuracy is the key of porous medium permeability assessment.
Summary of the invention
the technical problem to be solved in the present invention is, bias toward assessment to the low-permeability porous medium for porous medium gas penetration potential apparatus for evaluating in prior art, the less porous medium assessment that is applied to highly-breathable, sealing is poor, and the flow measurement error to minimum gas is large, cause the test findings distortion, the larger defects that waits of error, provide a kind of easy and simple to handle, measuring accuracy is high, good sealing effect, and can realize the purpose to the porous medium concurrent testing of the different gas permeability such as low-permeability and high osmosis energy, decrease test error, reliability and the comparability of test result have been improved, and can be used to the porous medium gas penetration potential apparatus for evaluating of qualitative, quantitative ground assessment porous medium gas penetration potential.
The technical solution adopted for the present invention to solve the technical problems is: a kind of porous medium gas penetration potential apparatus for evaluating comprises gas cylinder, reduction valve, tensimeter, the first gas flow rate meter, the second gas flow rate meter, test specimen clamp assemblies, gas flow sensor and monitor display;
The test specimen clamp assemblies comprises interconnective upper fixture and lower clamp, and upper fixture and lower clamp are hollow cylinder, and both inner hollow is connected; Upper fixture and lower clamp junction also are provided with packing ring;
Upper fixture top and lower clamp bottom are respectively equipped with pore and lower pore, wherein, upper pore is connected with gas cylinder with reduction valve by the first gas flow rate meter, tensimeter successively, and lower pore is connected with monitor display with gas flow sensor by the second gas flow rate meter successively.
Concrete operation step and the test principle of porous medium gas penetration potential apparatus for evaluating of the present invention are as follows:
(1) test specimen to be measured is machined to the testing requirements size, dry to constant weight, be coated with thin layer epoxy resin at test specimen sidewall to be measured, after epoxy cure, test specimen to be measured packed in the test specimen clamp assemblies, and seal with packing ring, determine after upper fixture and lower clamp stable connection, open high-pressure gas cylinder valve, detect the sealing of described porous medium gas penetration potential apparatus for evaluating, if this apparatus for evaluating is air tight, begin immediately to test the permeability of test specimen to be measured; The air-flow output terminal is connected in atmosphere, the control input end gaseous tension reduces from 0.4MPa to 0.15MPa step by step, differential is 0.05MPa, after every reduction one-level, the interval test period is about 10min, after the first gas flow rate meter and the second gas flow rate meter stable reading, read successively the flow velocity u of input end gas
n, pressure P
n, output terminal gas flow Q
n(gas flow by formula Q=uA is proofreaied and correct);
(2) under specified pressure, after the gas flow that sees through test specimen to be measured tends towards stability, read 3-5 gas flow rate, pressure and gas flow data, organize the eigenwert of test specimen as this after they are average, thereby can calculate by following formula the gas permeability coefficient of high osmosis test specimen:
In formula, μ---aerodynamic force viscosity (Ns/m
2);
The thickness of L---test specimen to be measured (m);
P
1-input end air pressure (Pa) for the first time;
u
1---input end gas flow rate (m/s) for the first time;
P
n---n secondary input end air pressure (Pa);
u
n---n secondary input end gas flow rate (m/s);
P
o---atmospheric pressure (Pa);
K---gas permeability coefficient (m
2);
When the porous medium gas penetration potential was relatively poor, the gaseous tension P temporal evolution of input end was less, and above-mentioned formula one can be reduced to:
And according to law of conservation of mass, input end and output terminal gas satisfy p
1u
1=P
0u
0, the unit interval sees through the flow Q=uA of porous medium, and the gas air transmission coefficient computing formula that obtains the low-permeability medium is as follows:
Wherein: A---gas transport area of section (m
2);
Q---the unit interval sees through the gas flow (m of test specimen
3/ s).
Can know by the explanation to above-mentioned concrete operation step, porous medium gas penetration potential apparatus for evaluating of the present invention has been considered the assumed condition of computation model in the test process, and can utilize same apparatus for evaluating to realize the purpose of the porous medium concurrent testing of different gas permeability energy, so not only decrease test error, also improve fiduciary level and the comparability of test result, but also can be used to the height of qualitative, quantitative ground assessment porous medium gas penetration potential.
In technical scheme of the present invention, described test specimen clamp assemblies comprises interconnective upper fixture and lower clamp, the connection part of being connected with lower clamp at upper fixture is provided with packing ring, make so described porous medium gas penetration potential apparatus for evaluating have good sealing effectiveness, so just can avoid large when air-transmitting flow velocity and pressure or see through the gas flow of medium when larger gas go out from the dissipation of test specimen sidewall, thereby can guarantee higher measuring accuracy.
in technical scheme of the present invention, upper fixture top and lower clamp bottom are respectively equipped with pore and lower pore, wherein, upper pore is successively by the first gas flow rate meter, tensimeter is connected with gas cylinder with reduction valve, lower pore is connected with monitor display with gas flow sensor by the second gas flow rate meter successively, be that technical scheme of the present invention has adopted highly sensitive gas flow sensor, and be aided with the gas flow rate meter and proofread and correct, this makes porous medium gas penetration potential apparatus for evaluating of the present invention can accurately record the flow of minimum gas, improved the precision that test findings is measured.
As a kind of improvement to technical scheme of the present invention, upper fixture bottom is provided with indent, and the lower clamp top is provided with evagination, and the shape of indent is corresponding with the shape of evagination.Make like this between fixture and lower clamp anchor by the indent between both and evagination close and be docking together, both surface of contact is concave-convex, has reduced the possibility of Leakage Gas, has further strengthened the impermeability of described porous medium gas penetration potential apparatus for evaluating.
As a kind of improvement to technical scheme of the present invention, upper fixture bottom is provided with evagination, and the lower clamp top is provided with indent, and the shape of evagination is corresponding with the shape of indent.As mentioned above, the surface of contact between upper fixture and lower clamp is concave-convex, has reduced the possibility of Leakage Gas, has also strengthened the impermeability of described porous medium gas penetration potential apparatus for evaluating.
As a kind of improvement to technical scheme of the present invention, upper fixture edge is provided with at least 3 upper fixture through holes, and the lower clamp edge is provided with at least 3 lower clamp through holes, and upper fixture through hole is corresponding with the position homogeneous one of lower clamp through hole; Be equipped with screw rod in the fixture through hole on each, and screw rod passes the lower clamp through hole of correspondence position.So just can pass upper fixture through hole and lower clamp through hole by screw rod upper fixture and lower clamp is further fixing, make the connection between fixture and lower clamp more steady, also make surface of contact both fit closelyr, can avoid large when air-transmitting flow velocity and pressure or see through the gas flow of medium when larger upper fixture and lower clamp mutually break away from, help to improve the impermeability of described apparatus for evaluating.Therefore porous medium gas penetration potential apparatus for evaluating of the present invention except the gas penetration potential assessment that can be applied to the low-permeability porous medium, can also be applied to the assessment of the porous medium gas penetration potential of other different gas permeability such as high osmosis.
As a kind of improvement to technical scheme of the present invention, it is 0 ~ 60m/s, response time less than the Pitot tube velocimeter of 1 second that the first gas flow rate meter and the second gas flow rate meter all adopt measurement range.Proofread and correct the gas flow that sees through test specimen to be measured with the gas flow rate meter, so just can guarantee that described porous medium gas penetration potential apparatus for evaluating has higher measuring accuracy and sensitivity.
As a kind of improvement to technical scheme of the present invention, the test specification of gas flow sensor is 1ml/min ~ 1000ml/min, and precision is 0.5ml/min.Same as above, the employing test specification is 1ml/min ~ 1000ml/min, and precision is the gas flow sensor of 0.5ml/min, helps to improve the measuring accuracy of described porous medium gas penetration potential apparatus for evaluating.
As a kind of improvement to technical scheme of the present invention, the material of test specimen clamp assemblies is A3 steel or organic plastics.
As a kind of improvement to technical scheme of the present invention, packing ring is rubber washer or silicone gasket.
In technical scheme of the present invention, can adopt conventional in the art gas cylinder, reduction valve, tensimeter, gas flow rate meter, gas flow sensor and monitor display to realize the technical program; In addition, in the present invention, other are not specifically noted, and all can reach the purpose that realizes the technical program by adopting the conventional means in this area.
Therefore, the invention has the beneficial effects as follows provides a kind of porous medium gas penetration potential apparatus for evaluating, described apparatus for evaluating is easy and simple to handle, measuring accuracy is high, good sealing effect, utilize described apparatus for evaluating can realize to the different gas permeability such as low-permeability or high osmosis can the purpose of porous medium concurrent testing, not only decrease test error, also improved reliability and the comparability of test result, and described apparatus for evaluating also can be used to the height of qualitative, quantitative ground assessment porous medium gas penetration potential.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in accompanying drawing:
Fig. 1 is the structural representation of porous medium gas penetration potential apparatus for evaluating of the present invention;
Fig. 2 is that wherein, black region is the surface of contact of test specimen to be measured and test specimen clamp assemblies with pack into structural representation after the test specimen clamp assemblies of test specimen to be measured, and the shadow region is the concavo-convex surface of contact of upper fixture and lower clamp;
Now that the label declaration in accompanying drawing is as follows: 1 is gas cylinder, 2 is reduction valve, and 3 is tensimeter, and 4 is the first gas flow rate meter, 5 is the test specimen clamp assemblies, 6 is gas flow sensor, and 7 is monitor display, and 8 is packing ring, 9 is upper fixture, 10 is screw rod, and 11 is lower clamp, and 12 is the second gas flow rate meter.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
As shown in Figure 1, this porous medium gas penetration potential apparatus for evaluating comprises that test specimen clamp assemblies 5, the first gas flow rate meter 4, gas cylinder 1, reduction valve 2, tensimeter 3, gas flow sensor 6, the second gas flow rate meter 12, monitor display 7 and conduit are some, wherein, test specimen clamp assemblies 5 comprises upper fixture 9 and the lower clamp 11 that is hollow cylinder, and the hollow of upper fixture 9 and lower clamp 11 communicates; Upper fixture 9 bottoms are provided with indent, lower clamp 11 tops are provided with evagination, the shape of this indent and evagination is corresponding, and also be provided with packing ring 8 both connecting part, both the edge is respectively equipped with 4 corresponding and equally distributed upper fixture through holes in position and lower clamp through hole, all is provided with screw rod 10 in fixture through hole and lower clamp through hole at every pair on corresponding;
Upper fixture 9 tops and lower clamp 11 bottoms are respectively equipped with pore and lower pore, wherein, upper pore is connected with gas cylinder 1 with reduction valve 2 by the first gas flow rate meter 4, tensimeter 3 successively, and lower pore is connected with monitor display 7 with gas flow sensor 6 by the second gas flow rate meter 12 successively.
In addition, it is 0 ~ 60m/s, response time less than the Pitot tube velocimeter of 1 second that the first gas flow rate meter 4 and the second gas flow rate meter 12 all adopt measurement range, and the test specification of gas flow sensor 6 is 1ml/min ~ 1000ml/min, and precision is 0.5ml/min.
Embodiment 1
The structure of described porous medium gas penetration potential apparatus for evaluating as shown in Figure 1, test specimen clamp assemblies 5 adopts the A3 mould steel, the outer diameter is 150mm, interior is 105mm along diameter, is highly 90mm, the jog height is 10mm, the diameter of upper pore is 8mm; The thickness of the packing ring 8 between test specimen to be measured and test specimen clamp assemblies 5 is about 2mm, and its internal diameter is 100mm, and external diameter is 105mm; Upper fixture 9 is connected the packing ring 8 of part with lower clamp 11 thickness is about 3mm, and internal diameter is 105mm, and external diameter is 125mm.
First test specimen to be measured is dried at a certain temperature to constant weight before test, be coated with thin layer epoxy resin at test specimen sidewall to be measured, after epoxy cure, test specimen to be measured is packed in test specimen clamp assemblies 5, and seal with packing ring 8, then tighten with screw rod 10, after connecting each assembly with conduit, can carry out gas permeability test.
Subjects is highly-breathable PVF material, increases gradually the input end gaseous tension until reach 0.4MPa, stablizes the gaseous tension P and the gas flow rate u that read input end after 5min
n, reduce successively input end pressure, every reduction by one minor tick 10min, each range of decrease is about 0.05MPa, after downstream output terminal gas flow is stable, reads successively the gaseous tension P of input end
nAnd gas flow rate u
n, gaseous tension P
nAnd gas flow rate u
nTest figure such as table 1, the Calculation of Gas infiltration coefficient, remove the larger data point of discreteness thus, obtains as the data in table 2.
Table 1 input end gaseous tension P
nAnd gas flow rate u
n
| Sequence number n | u n（m/s） | P n（MPa） | Sequence number | u n（m/s） | P n（MPa） |
| 1 | 0.876 | 0.398 | 4 | 0.676 | 0.253 |
| 2 | 0.832 | 0.351 | 5 | 0.546 | 0.199 |
| 3 | 0.762 | 0.297 | 6 | 0.338 | 0.147 |
The gas permeability coefficient of table 2 high osmosis porous medium
As can be seen from Table 2, utilize described porous medium gas penetration potential apparatus for evaluating to test the perviousness of the porous medium of high osmosis, measuring accuracy has reached 10
-11m
2, decrease test error, improved reliability and the comparability of test result, and described porous medium gas penetration potential apparatus for evaluating is simple to operate.
Embodiment 2
The structure of described porous medium gas penetration potential apparatus for evaluating is identical with embodiment 1, charge ratio shaping test piece according to the porous medium in table 3, and the size of test specimen is carried out according to standard 150mm * 150mm * 150mm, to the different length of times, according to matching requirements, sample dimensions is bored core processing preparation test specimen to be measured until maintenance; Test specimen to be measured is dried and at room temperature is cooled to constant weight under 105 ℃ of conditions, with epoxy resin with side seal, pack in test specimen clamp assemblies 5 and with screw rod 10, test specimen clamp assemblies 5 tightened, check the sealing of described porous medium gas penetration potential apparatus for evaluating, if without gas leak phenomenon, namely opening air valve tests, input end air pressure is controlled at the 0.2MPa left and right, after stablizing 10min, output terminal gas flow Q in record test certain hour, calculate at last the gas permeability coefficient of test specimen to be measured, the gas permeability coefficient that records is as shown in table 4.
The charge ratio of table 3 low-permeability porous medium
| Water-cement ratio | Cement | Water | Sand | Stone | Water reducer % |
| 0.25 | 550 | 137.5 | 716 | 1074 | 1.8 |
| 0.30 | 550 | 165 | 687 | 1030 | 0.9 |
| 0.35 | 550 | 192.5 | 658 | 986 | 0.9 |
The gas permeability coefficient of table 4 low-permeability porous medium
Data from table 3 can know that subjects is the low-permeability porous medium, can realize the low-permeability porous medium is tested and the data in table 4 also show described porous medium gas penetration potential apparatus for evaluating, and measuring accuracy have reached 10
-17, measuring accuracy is high.
Should be understood that, for those of ordinary skills, can be improved according to the above description or conversion, and all these improve and conversion all should belong to the protection domain of claims of the present invention.
Claims (8)
1. porous medium gas penetration potential apparatus for evaluating, it is characterized in that, comprise gas cylinder (1), reduction valve (2), tensimeter (3), the first gas flow rate meter (4), the second gas flow rate meter (12), test specimen clamp assemblies (5), gas flow sensor (6) and monitor display (7);
Described test specimen clamp assemblies (5) comprises interconnective upper fixture (9) and lower clamp (11), and described upper fixture (9) and lower clamp (11) are hollow cylinder, and both inner hollow is connected; Described upper fixture (9) and lower clamp (11) junction also are provided with packing ring (8);
Described upper fixture (9) top and lower clamp (11) bottom are respectively equipped with pore and lower pore, wherein, described upper pore is connected with gas cylinder (1) with reduction valve (2) by the first gas flow rate meter (4), tensimeter (3) successively, and described lower pore is connected with monitor display (7) with gas flow sensor (6) by the second gas flow rate meter (12) successively.
2. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, described upper fixture (9) bottom is provided with indent, and lower clamp (11) top is provided with evagination, and the shape of described indent is corresponding with the shape of evagination.
3. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, described upper fixture (9) bottom is provided with evagination, and lower clamp (11) top is provided with indent, and the shape of described evagination is corresponding with the shape of indent.
4. according to claim 2 or 3 described porous medium gas penetration potential apparatus for evaluating, it is characterized in that, described upper fixture (9) edge is provided with at least 3 upper fixture through holes, and lower clamp (9) edge is provided with at least 3 lower clamp through holes, and upper fixture through hole is corresponding with the position homogeneous one of lower clamp through hole; Be equipped with screw rod (10) on each in the fixture through hole, and screw rod (10) passes the lower clamp through hole of correspondence position.
5. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, it is 0 ~ 60m/s, response time less than the Pitot tube velocimeter of 1 second that described the first gas flow rate meter (4) and the second gas flow rate meter (12) all adopt measurement range.
6. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, the test specification of described gas flow sensor (6) is 1ml/min ~ 1000ml/min, and precision is 0.5ml/min.
7. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, the material of described test specimen clamp assemblies (5) is A3 steel or organic plastics.
8. porous medium gas penetration potential apparatus for evaluating according to claim 1, is characterized in that, described packing ring (8) is rubber washer or silicone gasket.
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| CN106226221A (en) * | 2016-08-19 | 2016-12-14 | 通标标准技术服务有限公司安吉分公司 | A kind of mattress breathability detector and using method |
| CN107843535A (en) * | 2017-11-03 | 2018-03-27 | 无锡市福莱达石油机械有限公司 | The measurement apparatus and method of hot-spraying coating connectivity porosity relative quantity |
| CN108333089A (en) * | 2017-10-20 | 2018-07-27 | 北京空天技术研究所 | A kind of gas permeability analysis method, system and ventilation property test device |
| CN109580074A (en) * | 2018-11-19 | 2019-04-05 | 安徽科达自动化集团股份有限公司 | A kind of high sensibility pressure transducer |
| CN109991144A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Epoxy sealing type measuring device for gas permeability |
| CN110132819A (en) * | 2019-06-11 | 2019-08-16 | 苏州宝明高温陶瓷有限公司 | The ventilative amount detecting device of the ventilative material sample block of filling pipe end |
| CN110220832A (en) * | 2019-05-27 | 2019-09-10 | 江南大学 | The permeability measurement method of zisha earthenware |
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| CN101126695A (en) * | 2007-09-07 | 2008-02-20 | 汉能科技有限公司 | Simple air permeability tester |
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| CN106226221A (en) * | 2016-08-19 | 2016-12-14 | 通标标准技术服务有限公司安吉分公司 | A kind of mattress breathability detector and using method |
| CN108333089A (en) * | 2017-10-20 | 2018-07-27 | 北京空天技术研究所 | A kind of gas permeability analysis method, system and ventilation property test device |
| CN109883916A (en) * | 2017-10-20 | 2019-06-14 | 北京空天技术研究所 | Ventilation property test device and gas permeability analysis method, system based on the device |
| CN107843535A (en) * | 2017-11-03 | 2018-03-27 | 无锡市福莱达石油机械有限公司 | The measurement apparatus and method of hot-spraying coating connectivity porosity relative quantity |
| CN109991144A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | Epoxy sealing type measuring device for gas permeability |
| CN109580074A (en) * | 2018-11-19 | 2019-04-05 | 安徽科达自动化集团股份有限公司 | A kind of high sensibility pressure transducer |
| CN110220832B (en) * | 2019-05-27 | 2021-07-27 | 江南大学 | Method for measuring air permeability of purple sand pottery |
| CN110220832A (en) * | 2019-05-27 | 2019-09-10 | 江南大学 | The permeability measurement method of zisha earthenware |
| CN110132819A (en) * | 2019-06-11 | 2019-08-16 | 苏州宝明高温陶瓷有限公司 | The ventilative amount detecting device of the ventilative material sample block of filling pipe end |
| CN111044862A (en) * | 2019-12-23 | 2020-04-21 | 南通大学 | Device for testing volume of gas capable of penetrating through fabric under action of simulated arc deflagration shock wave |
| CN112345432B (en) * | 2021-01-08 | 2021-04-09 | 中海储能科技(北京)有限公司 | Testing device and testing method for permeability of carbon fiber cloth in laying direction |
| CN112345432A (en) * | 2021-01-08 | 2021-02-09 | 中海储能科技(北京)有限公司 | Testing device and testing method for permeability of carbon fiber cloth in laying direction |
| CN113702263A (en) * | 2021-08-31 | 2021-11-26 | 西北有色金属研究院 | Testing arrangement of tubulose porous component pure water flux |
| CN114062219A (en) * | 2021-10-09 | 2022-02-18 | 广州先进技术研究所 | Breathable film performance test integrated device and operation method thereof |
| CN114062219B (en) * | 2021-10-09 | 2023-09-26 | 广州先进技术研究所 | Breathable film performance test integrated device and operation method thereof |
| CN114062221A (en) * | 2021-10-26 | 2022-02-18 | 安泰科技股份有限公司 | Porous sweating cooling material air permeability testing device and testing method |
| CN114062221B (en) * | 2021-10-26 | 2023-10-03 | 安泰科技股份有限公司 | Device and method for testing air permeability of porous sweating cooling material |
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