CN105466831A - A gas permeability testing device - Google Patents
A gas permeability testing device Download PDFInfo
- Publication number
- CN105466831A CN105466831A CN201510810213.5A CN201510810213A CN105466831A CN 105466831 A CN105466831 A CN 105466831A CN 201510810213 A CN201510810213 A CN 201510810213A CN 105466831 A CN105466831 A CN 105466831A
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- China
- Prior art keywords
- vacuum
- test
- valve
- pipeline
- chamber
- Prior art date
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 230000035699 permeability Effects 0.000 title abstract description 11
- 238000007789 sealing Methods 0.000 claims description 8
- 238000003825 pressing Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 abstract description 16
- 238000000034 method Methods 0.000 abstract description 8
- 230000004888 barrier function Effects 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 44
- 230000000694 effects Effects 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
The invention discloses a gas permeability testing device and relates to the technical field of material barrier property detection. The testing device comprises a vacuum cavity, a vacuum pump, a first pipeline, a second pipeline and a control system. The vacuum cavity is divided by a test sample into a test-gas cavity and a testing cavity. The testing cavity is communicated with the vacuum pump through the first pipeline. The test-gas cavity is communicated with the vacuum pump through the second pipeline. The control system is used for controlling automatic opening and closing of valves on a control pipeline, acquires pressure values and inputs the values into a computer. The testing device can test and analyzes gas permeability of a tube type sample according to ASME standards. Single-zone vacuum degrees are controlled independently by adoption of a plurality of the valves, so that flexibility is high. The testing device is simple in structure and reliable. A whole testing process is automatically controlled, thus reducing errors caused by manual operation.
Description
Technical field
The present invention relates to material barrier detection technique field, relate to the device that a kind of gas-premeable for tubular material carries out testing.
Background technology
, as graphite etc., because component adopts the technique such as powder infusion, sintering to be made, often there is the problem of compactness lower than metal material in bearing device nonmetallic materials, especially Inorganic Non-metallic Materials.Therefore this kind of material is when being used as bearing device material, must meet the requirement of enough low gas permeability.In the associated test standards of ASME (ASME) for graphite-made pressure vessel material, force to adopt pressure differential method to carry out graphite-like nonmetallic materials measuring gas permebility, but its concrete method of testing not clear and definite.At present, China's pressure vessel industries not yet has special test method for such material and testing apparatus.
Pressure differential method is the common method of measuring gas permebility.Its device structure is simple, and supplemental characteristic is easy to acquisition and processing.The ultimate principle of pressure differential method builds draught head in measured material both sides, driving gas enters low-pressure area from higher-pressure region through sample, unlike material or sample, to the barrier difference of gas, realize the assessment to material gas permeability by the air pressure change of Real-Time Monitoring low-pressure area.
Different from film or flat-type material, tubular structure is the common structure of non-metal kind pressure vessel, therefore for tubular structure sealing and to be installed be the key realizing Measurement accuracy.
Summary of the invention
The object of the invention is the shortcoming in order to solve existing apparatus and technology or deficiency, according to the measuring gas permebility standard-required of ASME, solving the measuring gas permebility problem of tubulose nonmetallic materials.Test process Automatic Control, high degree avoids the test error that human users introduces.
Measuring gas permebility device provided by the invention, comprises vacuum chamber, vacuum pump, the first pipeline, the second pipeline and control system;
Described test sample is tubulose sample; The tested sample of described vacuum chamber is divided into test gas chamber and test chamber two parts;
Described test chamber is connected with vacuum pump by the first pipeline, and the first described pipeline is disposed with the first vacuum meter, the first vacuum breaker valve and the first vacuum valve from test chamber.
Described test gas chamber is connected with vacuum pump by the second pipeline, and the second described pipeline is disposed with the second vacuum meter, the second vacuum breaker valve and the second vacuum valve from test gas chamber.
The inlet end of described second vacuum breaker valve is connected with source of the gas.
Control system connects the first vacuum breaker valve and the first vacuum valve, the second vacuum breaker valve and the second vacuum valve respectively, for controlling opening and closing automatically of the first vacuum breaker valve, the first vacuum valve, the second vacuum breaker valve and the second vacuum valve, and to communicate with the second vacuum meter with the first vacuum meter and gather air pressure numerical value and stored in computing machine.
Beneficial effect of the present invention:
1. can according to the testing and analyzing of ASME standard implementation tubulose sample air permeability;
2. more than valve list district vacuum tightness independently controls, and dirigibility is high;
3. can carry out the permeability test of the various nontoxic non-corrosiveness gases such as air, oxygen, nitrogen, helium;
4. structure is simple, reliable;
5. test whole-process automatic control, reduce the personnel to operate the error introduced.
Accompanying drawing explanation
Fig. 1 is the structural representation of measuring gas permebility device provided by the invention;
Fig. 2 is tubulose sample sealing schematic diagram.
In figure:
I. test gas chamber; II. test chamber; III. vacuum pump; IV. the first vacuum meter; V. the second vacuum meter;
VI. the first pipeline; VII. the second pipeline; VIII. source of the gas;
A. the first vacuum breaker valve; B. the first vacuum valve; C. the second vacuum valve; D. the second vacuum breaker valve;
1. test sample; 2. vacuum rubber; 3. pressing plate.
Embodiment
Below by drawings and Examples, the present invention is described in further detail.
The invention provides a kind of measuring gas permebility device, for testing the gas permeability of tubulose nonmetallic materials (test sample 1).Described proving installation comprises vacuum chamber, vacuum pump III, the first pipeline VI, the second pipeline VII and control system.As shown in Figure 1, the tested sample 1 of described vacuum chamber is divided into test gas chamber I and test chamber II two parts.As shown in Figure 2, described test sample 1 realizes vacuum chamber being divided into test gas chamber I and test chamber II two parts by the mode that vacuum rubber 2 seals, be specially, test sample 1 is tubular structure, adopt upper and lower two block pressur plates 3 to seal respectively two ends, and adopt vacuum rubber pad 2 to realize sealing at pressing plate 3 and test sample 1 end, during enforcement, first by lower floor's vacuum rubber pad 2 on lower platen, then tubulose test sample 1 is positioned on lower floor's vacuum rubber pad, put upper strata vacuum rubber pad and top board again well, apply certain pressure to two block pressur plates 3 vacuum rubber pad 2 is out of shape and completes sealing.Test gas chamber I is bell shape structure, after test chamber II completes sealing, is placed on by bell cover structure outside test sample 1, thus forms airtight test gas chamber I.The mode that described pressure can connect by arranging bolt and nut between two block pressur plates 3 realizes fastening exerting pressure.
Described test chamber II is communicated with vacuum pump III by the first pipeline VI, and the first described pipeline VI is provided with the first vacuum meter IV, the first vacuum breaker valve A and the first vacuum valve B.
Described test gas chamber I is connected with vacuum pump III by the second pipeline VII, and the second described pipeline VII is provided with the second vacuum meter V, the second vacuum breaker valve D and the second vacuum valve C.The inlet end of described second vacuum breaker valve D is connected with source of the gas VIII.
Described first vacuum valve B effect controls vacuum pump III to the vacuum pumping of test chamber II; The effect of described second vacuum valve C controls vacuum pump III to the vacuum pumping of test gas chamber I.
The effect of described first vacuum breaker valve A is the release controlling test chamber II vacuum environment; The effect of the second vacuum breaker valve D is the release of Control experiment air chamber I vacuum environment and source of the gas VIII air release is entered test gas chamber I;
The gas absolute pressure in test chamber II and test gas chamber I is independently measured in the effect of described first vacuum meter IV and the second vacuum meter V.
Described control system comprises data acquisition and control hardware and software, and hardware comprises computing machine, Digital I/O relay, number adopt communication interface.Control system major function is control first vacuum breaker valve A, the first vacuum valve B, the second vacuum valve C, the opening and closing automatically of the second vacuum breaker valve D, to communicate with the second vacuum meter V with the first vacuum meter IV and gather air pressure numerical value and stored in computing machine.
embodiment:
As the signal of Fig. 1, vacuum pump III, the first vacuum meter IV, the second vacuum meter V, test gas chamber I, test chamber II, the first pipeline VI, the second pipeline VII Connecting groups are installed, test sample 1 being fixed in vacuum chamber according to being installed shown in Fig. 2 in fixture, vacuum chamber being divided into test gas chamber I and test chamber II two parts.Close the first vacuum breaker valve A and the second vacuum breaker valve D, open the first vacuum valve B and the second vacuum valve C, open vacuum pump III and test gas chamber I and test chamber II is vacuumized; Measured the vacuum tightness of test chamber II by the first vacuum meter IV, measured the vacuum tightness of test gas chamber I by the second vacuum meter V; After the two vacuum tightness all reaches background vacuum, as <100Pa, close the first vacuum valve B and the second vacuum valve C, open the first vacuum breaker valve D test gas is released into the I of test gas chamber from source of the gas VIII, until the air pressure in the I of test gas chamber reaches atmospheric pressure state and stablizes; Now record the pressure of the reading in the second vacuum meter V as test gas chamber I, record the reading curve over time of the first vacuum meter IV; Finally the pressure curve of record is required according to the testing standard of ASME the calculating carrying out gas permeability K (L), computing formula is:
Wherein, K (L) is gas permeability, unit mm
2/ s; d
afor test sample external diameter, unit mm; d
ifor test sample internal diameter, unit mm; l
2for specimen length, unit mm; P
11for the pressure of test chamber when test starts, units MPa; P
12for the pressure of test chamber at the end of test, units MPa; Pa is the pressure in test gas chamber, units MPa; Δ t is that test starts and the mistiming terminated, unit s; V is the volume sum of test chamber and the first pipeline IV, unit mm
3.According to the present embodiment, the detecting lower limit and can reach 10 of material gas permeability
-6mm
2/ s.
Claims (2)
1. a measuring gas permebility device, is characterized in that: comprise vacuum chamber, vacuum pump, the first pipeline, the second pipeline and control system;
The tested sample of described vacuum chamber is divided into test gas chamber and test chamber two parts;
Described test chamber is connected with vacuum pump by the first pipeline, and the first described pipeline is disposed with the first vacuum meter, the first vacuum breaker valve and the first vacuum valve from test chamber;
Described test gas chamber is connected with vacuum pump by the second pipeline, and the second described pipeline is disposed with the second vacuum meter, the second vacuum breaker valve and the second vacuum valve from test gas chamber;
The inlet end of described second vacuum breaker valve is connected with source of the gas;
Control system connects the first vacuum breaker valve and the first vacuum valve, the second vacuum breaker valve and the second vacuum valve respectively, for controlling opening and closing automatically of the first vacuum breaker valve, the first vacuum valve, the second vacuum breaker valve and the second vacuum valve, and communicate with the second vacuum meter with the first vacuum meter, gather air pressure numerical value and stored in computing machine.
2. a kind of measuring gas permebility device according to claim 1, it is characterized in that: test sample is tubular structure, upper and lower two block pressur plates are adopted to seal respectively two ends, and adopt vacuum rubber to pad existing sealing at pressing plate and test sample end, during enforcement, first lower floor's vacuum rubber is padded on lower platen, then tubulose test sample is positioned on lower floor's vacuum rubber pad, put upper strata vacuum rubber pad and top board again well, to two block pressur plates applying pressure, vacuum rubber pad be out of shape and complete sealing; Test gas chamber is bell shape structure, after test chamber completes sealing, is placed on outside test sample by bell cover structure, thus forms airtight test gas chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510810213.5A CN105466831B (en) | 2015-11-20 | 2015-11-20 | A kind of measuring gas permebility device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510810213.5A CN105466831B (en) | 2015-11-20 | 2015-11-20 | A kind of measuring gas permebility device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105466831A true CN105466831A (en) | 2016-04-06 |
| CN105466831B CN105466831B (en) | 2018-09-28 |
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ID=55604769
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510810213.5A Expired - Fee Related CN105466831B (en) | 2015-11-20 | 2015-11-20 | A kind of measuring gas permebility device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105466831B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370583A (en) * | 2016-11-08 | 2017-02-01 | 天津天盈新型建材有限公司 | Evaluation method of haze-proof ventilation window screening air permeability |
| CN107063968A (en) * | 2017-05-02 | 2017-08-18 | 三峡大学 | Concrete gas testing permeability device and method |
| CN107389498A (en) * | 2017-07-07 | 2017-11-24 | 金华职业技术学院 | A kind of method for measuring methane transmitance |
| CN107796746A (en) * | 2017-12-12 | 2018-03-13 | 南通星球石墨设备有限公司 | A kind of material permeability coefficient detection means |
| CN108344674A (en) * | 2017-01-25 | 2018-07-31 | 济南思克测试技术有限公司 | A kind of gas permeation rate Auto-Test System and method based on artificial intelligence |
| WO2022267218A1 (en) * | 2021-06-24 | 2022-12-29 | 华中科技大学 | Permeability measurement apparatus and permeability measurement method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106370583A (en) * | 2016-11-08 | 2017-02-01 | 天津天盈新型建材有限公司 | Evaluation method of haze-proof ventilation window screening air permeability |
| CN106370583B (en) * | 2016-11-08 | 2023-10-27 | 天津市贰拾壹站检测技术有限公司 | Method for evaluating air permeability of haze-preventing ventilation window screening |
| CN108344674A (en) * | 2017-01-25 | 2018-07-31 | 济南思克测试技术有限公司 | A kind of gas permeation rate Auto-Test System and method based on artificial intelligence |
| CN108344674B (en) * | 2017-01-25 | 2023-12-26 | 济南思克测试技术有限公司 | Automatic gas permeability testing system and method based on artificial intelligence |
| CN107063968A (en) * | 2017-05-02 | 2017-08-18 | 三峡大学 | Concrete gas testing permeability device and method |
| CN107389498A (en) * | 2017-07-07 | 2017-11-24 | 金华职业技术学院 | A kind of method for measuring methane transmitance |
| CN107389498B (en) * | 2017-07-07 | 2024-01-12 | 金华职业技术学院 | Method for measuring methane transmittance |
| CN107796746A (en) * | 2017-12-12 | 2018-03-13 | 南通星球石墨设备有限公司 | A kind of material permeability coefficient detection means |
| WO2022267218A1 (en) * | 2021-06-24 | 2022-12-29 | 华中科技大学 | Permeability measurement apparatus and permeability measurement method |
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| Publication number | Publication date |
|---|---|
| CN105466831B (en) | 2018-09-28 |
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Granted publication date: 20180928 Termination date: 20201120 |