CN114674720A - Gas transmittance testing device - Google Patents
Gas transmittance testing device Download PDFInfo
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- CN114674720A CN114674720A CN202210233769.2A CN202210233769A CN114674720A CN 114674720 A CN114674720 A CN 114674720A CN 202210233769 A CN202210233769 A CN 202210233769A CN 114674720 A CN114674720 A CN 114674720A
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- 238000012360 testing method Methods 0.000 title claims abstract description 83
- 238000002834 transmittance Methods 0.000 title abstract description 21
- 238000001514 detection method Methods 0.000 claims abstract description 107
- 238000007789 sealing Methods 0.000 claims abstract description 80
- 230000035699 permeability Effects 0.000 claims abstract description 25
- 230000000694 effects Effects 0.000 abstract description 5
- 239000012466 permeate Substances 0.000 abstract description 4
- 238000005086 pumping Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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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Abstract
The invention discloses a gas transmittance testing device, which comprises a first main body and a second main body which are oppositely arranged at intervals, wherein a first detection cavity is arranged on the first main body, a second detection cavity corresponding to the first detection cavity is arranged on one surface of the second main body facing the first detection cavity, and the second detection cavity is separated from the first detection cavity through a sample and can form pressure difference; a plurality of sealing elements are arranged between the first main body and the second main body, vacuum sealing cavities can be formed between the two adjacent sealing elements and the first main body and the second main body, and a cavity is formed in the first main body and/or the second main body in each sealing cavity. Therefore, the volume of the sealed cavity can be increased through the cavity, the anti-leakage effect after the sealed space is vacuumized is improved, and the accuracy that the air permeability of the sample is influenced due to the fact that the air permeates into the low-pressure cavity in the thickness direction of the sample and the binding surface of the sample and the second main body is effectively avoided.
Description
Technical Field
The invention relates to the technical field of gas permeability testing instruments, in particular to a gas permeability testing device.
Background
The gas permeability testing apparatus is generally used for testing the permeability of packing materials or other new materials, wherein the differential pressure method is one of the methods for testing the permeability, and the vacuum method is one of the most representative methods in the differential pressure method. The testing principle is that a sample is utilized to divide a permeation cavity into two independent spaces, the two independent spaces are vacuumized to form an upper cavity and a lower cavity, then testing gas is filled into one of the two independent spaces, so that one of the two independent spaces forms a high-pressure cavity, the other independent space forms a low-pressure cavity, and therefore pressure difference is formed between the high-pressure cavity and the low-pressure cavity. In this way, the high-pressure cavity and the low-pressure cavity are isolated through the sample (a film sample or a slice sample), the sample is permeated from the high-pressure cavity into the low-pressure cavity by utilizing the test gas to cause the change of the pressure of the low-pressure cavity, and then the variable quantity of the pressure in the low-pressure cavity is measured by using the high-progress vacuum gauge, so that the permeation quantity of the test gas permeating the sample can be obtained. However, the sealing structure of the existing gas permeability testing device has a defect in design, so that the leakage-proof effect is poor, air permeates into the low-pressure cavity, and an error is introduced, so that the accuracy of the gas permeability test of the sample is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a gas transmittance testing device which can improve the anti-leakage effect of a vacuum-pumping sealed cavity in the process of testing the gas transmittance of a sample and avoid the influence of errors caused by the permeation of external air into a low-pressure cavity on the accuracy of the gas transmittance test of the sample.
The purpose of the invention is realized by adopting the following technical scheme:
gas transmission rate testing arrangement includes:
the first main body is provided with a first detection cavity;
the second main body is arranged opposite to the first main body at an interval, one surface of the second main body facing the first detection cavity is provided with a second detection cavity corresponding to the first detection cavity, and the second detection cavity is separated from the first detection cavity through a sample and can form a pressure difference;
the sealing elements are arranged between the first main body and the second main body, vacuum sealing cavities can be formed between the two adjacent sealing elements and the first main body and between the two adjacent sealing elements and the second main body, and a cavity is formed in each sealing cavity on the first main body and/or the second main body so as to form a sealing space with the sealing cavities.
Furthermore, the gas transmittance testing device also comprises a vacuumizing system, wherein the vacuumizing system comprises a vacuumizing device, a connecting pipeline and a plurality of mutually independent gas flow pipelines, the number of the gas flow pipelines is the same as that of the sealed spaces, the first end of each gas flow pipeline is communicated with each sealed space, the second end of each gas flow pipeline is communicated with the vacuumizing device through the connecting pipeline so as to vacuumize the sealed spaces, and each gas flow pipeline is provided with a switch valve for controlling the opening and the closing of each gas flow pipeline.
Furthermore, each air flow pipeline is provided with a first vacuum sensor for testing the vacuum degree in each sealed space, and the first vacuum sensor is positioned between the switch valve and the sealed space.
Furthermore, the vacuum pumping system also comprises a first pipeline, wherein the first end of the first pipeline is communicated with the connecting pipeline, and the second end of the first pipeline is communicated with the second detection cavity so as to be capable of pumping vacuum to the second detection cavity.
Furthermore, the first pipeline is provided with a second vacuum sensor for testing the vacuum degree of the second detection cavity, the first pipeline is further connected with a connecting air pipe, the connecting air pipe is connected with a plurality of branch pipelines, each branch pipeline is provided with a third vacuum sensor, and each branch pipeline is provided with a first control valve for controlling each opening and closing, so that each third vacuum sensor and the second vacuum sensor form a parallel arrangement.
Furthermore, the vacuum pumping system also comprises a second pipeline, wherein the first end of the second pipeline is communicated with the connecting pipeline, and the second end of the second pipeline is communicated with the first detection cavity so as to be capable of pumping vacuum to the first detection cavity.
Furthermore, a second control valve for controlling the second pipeline to open and close and/or a fourth vacuum sensor for testing the vacuum degree in the first detection cavity are/is arranged on the second pipeline.
Furthermore, the second pipeline is also communicated with an air source, and the air source is used for filling test gas into the first detection cavity.
Further, the number of the sealing members at one end of the sample is 3, the starting point is the end close to the sample, the 3 sealing members are an inner sealing member, a middle sealing member and an outer sealing member in sequence, the edge of one end of the sample is covered by the middle sealing member, and the inner sealing member, the middle sealing member, the cavity, the sealed space formed by the first body and the second body can also be communicated with the air source through the second pipeline.
Furthermore, the junction of the second pipeline and the connecting pipeline is connected with an emptying pipeline, the emptying pipeline is provided with an emptying valve, and the emptying pipeline is provided with an emptying valve for controlling the opening and closing of the emptying pipeline.
Compared with the prior art, the invention has the beneficial effects that:
when the gas permeability testing device is used, a test sample is placed between the first main body and the second main body to enable the sample to separate the first detection cavity from the second detection cavity, then the first detection cavity and the second detection cavity are vacuumized, the test gas is filled into the first detection cavity after vacuumization, so that pressure difference is formed between the first detection cavity and the second detection cavity, the first detection cavity forms a high-pressure cavity, the second detection cavity forms a low-pressure cavity, a plurality of sealing elements positioned between the first main body and the second main body form a sealing cavity, a cavity is formed on the first main body and/or the second main body in each sealing cavity to form a sealing space with the sealing cavities to improve the volume of the sealing cavities, and finally the sealing space is vacuumized, so that the leakage prevention effect of the sealing space after vacuumization can be improved, and the influence of errors caused by the fact that air penetrates into the low-pressure cavity in the thickness direction of the sample and the joint surface of the sample and the second main body to affect the gas permeability testing of the sample is effectively avoided The accuracy of (2).
Drawings
FIG. 1 is a schematic view of a gas transmittance testing apparatus according to the present invention.
In the figure: 10. a first body; 101. a first detection chamber; 20. a second body; 201. a second detection chamber; 30. a seal member; 4. a sample; 401. a support plate; 50. sealing the cavity; 501. a cavity; 61. an air flow conduit; 610. an on-off valve; 611. a first vacuum sensor; 62. connecting a pipeline; 63. a vacuum pumping device; 70. a first conduit; 701. a low pressure valve; 702. a second vacuum sensor; 71. a second conduit; 710. a second control valve; 711. a fourth vacuum sensor; 73. a branch line; 730. a first control valve; 731. a third vacuum sensor; 74. a fourth conduit; 740. a fourth control valve; 741. a fifth vacuum sensor; 80. an emptying pipeline; 801. an atmospheric valve; 90. a third pipeline; 901. a third control valve; 902. and (4) a gas source.
Detailed Description
The present invention will be described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the following description, various embodiments or technical features may be arbitrarily combined to form a new embodiment without conflict.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "horizontal", "vertical", "top", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
The implementation mode is as follows:
as shown in fig. 1, the present invention shows a gas permeability testing apparatus including a first body 10, a second body 20, and a plurality of sealing members 30. Wherein, the first main body 10 is provided with a first detection cavity 101; the second main body 20 and the first main body 10 are arranged at an interval, one surface of the second main body 20 facing the first detection cavity 101 is provided with a second detection cavity 201 corresponding to the first detection cavity 101, and the second detection cavity 201 and the first detection cavity 101 are separated by a sample 4 (a film sample or a sheet sample) and can form a pressure difference; each sealing member 30 is disposed between the first body 10 and the second body 20, and a vacuum sealing cavity 50 is formed between two adjacent sealing members 30 and between the first body 10 and the second body 20, and a cavity 501 is opened on the first body 10 and/or the second body 20 in each sealing cavity 50 to form a sealing space with the sealing cavity 50.
When the gas transmittance testing device of the present invention is used, a sample 4 (a film sample or a sheet sample) is placed between the first body 10 and the second body 20 to separate the sample 4 from the first detection chamber 101 and the second detection chamber 201, then the first detection chamber 101 and the second detection chamber 201 are evacuated, and after the evacuation, a test gas is filled into the first detection chamber 101, so that a pressure difference is formed between the first detection chamber 101 and the second detection chamber 201 to form a high pressure chamber in the first detection chamber 101 and a low pressure chamber in the second detection chamber 201, and since the plurality of sealing members 30 located between the first body 10 and the second body 20 form a sealing chamber 50 with the first body 10 and the second body 20, a sealing space is formed between the sealing chamber 50 and the cavity 501 by forming the cavity 501 on the first body 10 and/or the second body 20 in each sealing chamber 50 to increase the volume of the sealing chamber 50, and finally, the sealed space is vacuumized, so that the leakage-proof effect of the vacuumized sealed space can be improved, and the problem that the accuracy of the gas transmittance test of the sample is influenced due to errors caused by the fact that air permeates into the low-pressure cavity in the thickness direction of the sample and the binding surface of the sample and the second main body 20 is effectively avoided.
It should be noted that the shape and structure of the cavity 501 in the present embodiment are not limited to the rectangular structure shown in the following drawings, and in other embodiments, the inventor may appropriately select and change the shape and structure of the cavity 501 according to the actual situation, which is not limited herein. Therefore, it is obvious to those skilled in the art that the shape and structure of the cavity 501 can be modified reasonably, and the modified cavity also falls into the protection scope of the present invention.
In this embodiment, the gas transmittance testing apparatus of the present invention further includes a vacuum pumping system. The vacuum-pumping system comprises a vacuum-pumping device 63, a connecting pipeline 62 and a plurality of mutually independent air flow pipelines 61, wherein the number of the air flow pipelines 61 is the same as that of the sealed spaces, namely one air flow pipeline 61 is communicated with one sealed space. Specifically, a first end of each air flow duct 61 communicates with each sealed space, a second end of each air flow duct 61 communicates with a vacuum extractor 63 through a connecting duct 62 to enable vacuum extraction from the sealed space, and each air flow duct 61 is provided with an on-off valve 610 for controlling opening and closing of each. It can be understood that, when the vacuum-pumping device 63 (vacuum-pumping pump) is turned on, the sealed spaces can be pumped vacuum through the gas flow pipes 61, and after the sealed spaces are in a vacuum state, the valves of the switch valves 610 on the gas flow pipes 61 are closed, so that each sealed space forms an independent sealed space, that is, the adjacent sealed spaces are independent from each other; the sealing space close to the first detection cavity 101 or the second detection cavity 201 is defined as an inner sealing space, the sealing space close to the end face of the first main body 10 or the second main body 20 is defined as an outer sealing space, and the sealing space between the inner sealing space and the outer sealing space is defined as an intermediate sealing space.
In this embodiment, each of the airflow pipes 61 is provided with a first vacuum sensor 611 for testing a vacuum degree in each of the sealed spaces, and the first vacuum sensor 611 is located between the switch valve 610 and the sealed space. It can be understood that, when the valve of the on-off valve 610 on each air flow duct 61 is in a closed state after each sealed space is in a vacuum state, the first vacuum sensor 611 on each air flow duct 61 can test the vacuum degree in each sealed space, so as to know the result of leakage of each sealed space in the vacuum state.
On the basis of the structure, the vacuumizing system further comprises a first pipeline 70 and a second pipeline 71, wherein the first end of the first pipeline 70 is communicated with the connecting pipeline 62, and the second end of the first pipeline 70 is communicated with the second detection cavity 201 so as to vacuumize the second detection cavity 201; a first end of the second duct 71 communicates with the connection duct 62, and a second end of the second duct 71 communicates with the first detection chamber 101 so that the first detection chamber 101 can be evacuated. As can be seen, the vacuum extractor 63 extracts vacuum from the second detection chamber 201 through the first channel and extracts vacuum from the first detection chamber 101 through the second channel. It can be understood by those skilled in the art that the vacuuming device 63 can simultaneously vacuumize the sealed spaces, the first detection chamber 101 and the second detection chamber 201, or the valve of the on-off valve 610 on each air flow pipe 61 can be closed, and after the vacuuming device 63 vacuums the first detection chamber 101 and the second detection chamber 201, the valve of the on-off valve 610 on each air flow pipe 61 is opened to vacuumize the sealed spaces, which is not limited herein.
In this embodiment, the first pipe 70 is provided with a second vacuum sensor 702 for testing the vacuum degree of the second detection chamber 201 and a low pressure valve 701 for controlling the opening and closing of the first pipe 70, and the second vacuum sensor 702 is located between the low pressure valve 701 and the second detection chamber 201. The first pipe 70 is further connected with a connecting air pipe, the connecting air pipe is connected with a plurality of branch pipes 73, each branch pipe is provided with a third vacuum sensor 731, and each branch pipe is provided with a first control valve 730 for controlling opening and closing of each branch pipe, so that each third vacuum sensor 731 and the second vacuum sensor 702 are arranged in parallel. It can be understood by those skilled in the art that, when the gas transmittance of the test sample 4 is measured, the test gas in the high-pressure chamber (the first detection chamber 101) enters the low-pressure chamber (the second detection chamber 201) through the sample, the gas transmittance of the test gas can be obtained by arranging the second vacuum sensor 702 and the third vacuum sensor 731 in parallel to measure the pressure variation in the low-pressure chamber, and when the measured pressure of the second vacuum sensor 702 connected to the gas pipe reaches a saturation state, the third vacuum sensor 731 on the branch pipeline can be turned on, so that a wider test range can be realized, and the test requirements of test materials with different gas transmittances can be met without replacing the vacuum sensors.
In this embodiment, the second pipe 71 is further provided with a second control valve 710 for controlling the opening and closing of the second pipe 71 and/or a fourth vacuum sensor 711 for testing the vacuum degree in the first detection chamber 101. The second pipe 71 of the present embodiment is provided with a second control valve 710 for controlling the opening and closing of the second pipe 71 and a fourth vacuum sensor 711 for testing the vacuum degree in the first detection chamber 101. The fourth vacuum sensor 711 is located between the second control valve 710 and the first detection chamber 101, and when the first detection chamber 101 needs to be evacuated, a valve of the second control valve 710 is opened; when the first detection chamber 101 is in a vacuum state, the valve of the second control valve 710 is closed, and the vacuum degree in the first detection chamber 101 can be detected by the fourth vacuum sensor 711. Of course, in other embodiments, the second control valve 710 or the fourth vacuum sensor 711 may be separately provided, which is not limited herein.
In this embodiment, the second pipeline 71 is further communicated with an air source 902, the air source 902 is used for filling the first detection cavity 101 with the test gas, that is, when the first detection cavity 101, the second detection cavity 201 and each sealed space are in a vacuum state, the first detection cavity 101 is filled with the test gas through the air source 902, so that the pressure in the first detection cavity 101 is greater than the pressure in the second detection cavity 201, and further the first detection cavity 101 forms a high pressure cavity and the second detection cavity 201 forms a low pressure cavity.
Specifically, the air source 902 communicates with the second pipeline 71 through the third pipeline 90, and a third control valve 901 is disposed on the third pipeline 90, and the third control valve 901 is used for controlling the opening and closing of the third pipeline 90. It can be understood that when the first detection chamber 101, the second detection chamber 201 and each sealed space are subjected to the vacuum pumping, the valve of the second control valve 710 is opened, and the valve of the third control valve 901 is closed; when the first detection chamber 101, the second detection chamber 201 and each sealed space are in a vacuum state, the valve of the third control valve 901 is opened, the valve of the second control valve 710 is opened, and the test gas can be filled into the first detection chamber 101 by opening the gas source 902 through the third pipeline 90 and the second pipeline 71.
In this embodiment, the number of the sealing members 30 at one end of the sample 4 is 3, and starting from the end close to the sample 4, the 3 sealing members 30 are an inner sealing member 30, a middle sealing member 30 and an outer sealing member 30 in sequence, the edge of one end of the sample 4 is covered by the middle sealing member 30, and the inner sealing member 30, the middle sealing member 30, the cavity 501, and the inner sealed space formed by the first body 10 and the second body 20 can also be communicated with the gas source 902 through the second pipe 71. It can be understood that, since one end edge of the sample 4 is covered by the middle seal 30, the sample 4 divides the two cavities 501 in the inner sealed space by one end portion thereof, and when the inner sealed space is in a vacuum state, the gas source 902, the third pipe 90 and the second pipe 71 inflate one of the cavities 501 in the inner sealed space to form a high-pressure cavity, and simultaneously inflate the other of the cavities 501 in the inner sealed space to form a low-pressure cavity, so that the gas permeability testing apparatus of the present invention is formed with two gas permeability testing portions (one is the two cavities 501 in the inner sealed space, and the other is the first detection cavity 101 and the second detection cavity 201), thereby improving the testing efficiency of the gas permeability.
In other embodiments, the inventor may reasonably select the number of the sealing members 30 according to the actual situation, and the invention is not limited herein. Therefore, it is within the scope of the present invention for those skilled in the art to appropriately change the number of the sealing members 30 to form a plurality of sealing spaces with the first body 10 and the second body 20.
Of course, the inner seal 30, the middle seal 30, the cavity 501, and the inner sealed space formed by the first body 10 and the second body 20 communicate with the second pipe 71 through the fourth pipe 74, and the fourth pipe 74 is provided with the fourth control valve 740 and the fifth vacuum sensor 741, and the fifth vacuum sensor 741 is located between the fourth pipe 74 and the inner sealed space. When the inner sealing member 30, the middle sealing member 30, the cavity 501, and the inner sealing space formed by the first main body 10 and the second main body 20 are not used as the gas transmittance testing part, the fourth control valve 740 can be closed by the fourth pipeline 74 and the upper control valve 740 to prevent the gas source 902 from filling the test gas into the inner sealing space, so that the inner sealing space can play a role of leakage, isolation and buffering for the gas transmittance testing part formed by the first detection cavity 101 and the second detection cavity 201.
In this embodiment, the gas transmittance testing apparatus of the present invention further includes a supporting plate 401, the supporting plate 401 is provided with a through hole, the supporting plate 401 is located between the first main body 10 and the second main body 20, the supporting plate 401 is used for placing the sample 4, the deformation of the sample 4 can be avoided by the supporting plate 401, and the through hole is used for preventing the testing gas in the high pressure chamber from being unable to permeate the low pressure chamber.
In this embodiment, a vent pipe 80 is connected to a joint of the second pipe 71 and the connecting pipe 62, a vent valve 801 is disposed on the vent pipe 80, and the vent pipe 80 is provided with the vent valve 801 for controlling opening and closing of the vent pipe 80. That is, it can be understood that, after the gas transmittance test is finished, the vent valve 801 is opened, and the test gas in the first detection chamber 101 and/or the test gas in the high-pressure chamber in the inside sealed space is exhausted through the vent valve 801 via the second pipe 71.
The working principle of the gas transmittance testing device is as follows:
when testing the gas permeability of the sample 4, placing the sample 4 between the first body 10 and the second body 20, the sample 4 separating the first detection chamber 101 and the second detection chamber 201, the edge of one end of the sample 4 being covered by the middle seal 30, the low pressure valve 701, the second control valve 710 and the respective switch valves 610 being opened, and the vacuum-pumping device 63 pumping vacuum to the first detection chamber 101, the second detection chamber 201 and the respective sealed spaces through the connecting pipe 62, the respective gas flow pipes 61, the first pipe 70 and the second pipe 71; after the vacuum pumping is finished, the low-pressure valve 701 and each switch valve 610 are closed, the switch of the gas source 902 is opened, the gas source 902 fills the test gas into the first detection cavity 101 through the third pipeline 90 and the second pipeline 71, so that the first detection cavity 101 forms a high-pressure chamber, and the second detection cavity 201 forms a low-pressure chamber; after the first detection cavity 101 is filled with the test gas, the switch of the gas source 902 is closed, and the gas transmission of the test gas can be obtained by measuring the pressure variation in the low-pressure chamber through the second vacuum sensor 702 and the third vacuum sensor 731 which are arranged in parallel; after the test is finished, the vent valve 801 is opened, and the test gas in the first detection cavity 101 and/or the test gas in the high-pressure cavity in the inner side sealed space is discharged through the vent valve 801 through the second pipeline 71.
In conclusion, the gas transmittance testing device of the present invention can effectively prevent air from permeating into the low pressure chamber in the thickness direction of the sample 4 and the bonding surface between the sample 4 and the second main body 20, thereby improving the accuracy of the gas transmittance test of the sample 4 and further improving the accuracy of the barrier test of the sample 4.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are intended to be covered by the claims.
Claims (10)
1. Gas permeability testing arrangement, its characterized in that includes:
the device comprises a first main body (10), wherein a first detection cavity (101) is arranged on the first main body (10);
the second body (20) is arranged opposite to the first body (10) at a certain interval, one surface of the second body (20) facing the first detection cavity (101) is provided with a second detection cavity (201) corresponding to the first detection cavity (101), and the second detection cavity (201) is separated from the first detection cavity (101) through a sample (4) and can form a pressure difference;
the sealing elements (30) are arranged between the first main body (10) and the second main body (20), a vacuum sealing cavity (50) can be formed between the two adjacent sealing elements (30) and the first main body (10) and the second main body (20), and a cavity (501) is formed in each sealing cavity (50) on the first main body (10) and/or the second main body (20) to form a sealing space with the sealing cavity (50).
2. The gas permeability test apparatus according to claim 1, wherein: still including evacuation system, evacuation system includes evacuating device (63), connecting tube (62) and a plurality of mutually independent air flow pipeline (61), the quantity of air flow pipeline (61) is the same with the quantity of confined space, the first end and each confined space intercommunication of each air flow pipeline (61), and the second end of each air flow pipeline (61) passes through connecting tube (62) and evacuating device (63) intercommunication and can with confined space evacuation, and all be equipped with the ooff valve (610) of the respective switching of control on each air flow pipeline (61).
3. The gas permeability test apparatus according to claim 2, wherein: each air flow pipeline (61) is provided with a first vacuum sensor (611) used for testing the vacuum degree in each sealed space, and the first vacuum sensors (611) are located between the switch valve (610) and the sealed spaces.
4. The gas permeability test apparatus according to claim 2, wherein: the vacuumizing system further comprises a first pipeline (70), a first end of the first pipeline (70) is communicated with the connecting pipeline (62), and a second end of the first pipeline (70) is communicated with the second detection cavity (201) so that the second detection cavity (201) can be vacuumized.
5. The gas permeability test apparatus according to claim 3 or 4, wherein: be equipped with on first pipeline (70) and be used for the test second vacuum sensor (702) of vacuum in second detection chamber (201), still be connected with the connecting pipe on first pipeline (70), be connected with a plurality of branch pipelines (73) on the connecting pipe, all be provided with third vacuum sensor (731) on each branch pipeline (73), and all be equipped with first control valve (730) that are used for controlling each switching on each branch pipeline (73), so that each third vacuum sensor (731) with second vacuum sensor (702) forms the parallelly connected setting.
6. The gas permeability test apparatus according to claim 2, 3 or 4, wherein: the vacuumizing system further comprises a second pipeline (71), a first end of the second pipeline (71) is communicated with the connecting pipeline (62), and a second end of the second pipeline (71) is communicated with the first detection cavity (101) so as to be capable of vacuumizing the first detection cavity (101).
7. The gas permeability test apparatus according to claim 6, wherein: the second pipeline (71) is provided with a second control valve (710) for controlling the opening and closing of the second pipeline (71) and/or a fourth vacuum sensor (711) for testing the vacuum degree in the first detection cavity (101).
8. The gas permeability test apparatus according to claim 7, wherein: the second pipeline (71) is also communicated with a gas source (902) used for filling test gas into the first detection cavity (101).
9. The gas permeability test apparatus according to claim 8, wherein: the number of the sealing elements (30) at one end of the sample (4) is 3, the starting point is that the end close to the sample (4) is used, the 3 sealing elements (30) are an inner sealing element (30), a middle sealing element (30) and an outer sealing element (30), the edge of one end of the sample (4) is covered by the middle sealing element (30), and the inner sealing element (30), the middle sealing element (30), the cavity (501), the sealed space formed by the first main body (10) and the second main body (20) can be communicated with the air source (902) through the second pipeline (71).
10. The gas permeability test apparatus according to claim 9, wherein: the second pipeline (71) and the connecting pipeline (62) are connected with an emptying pipeline (80), an emptying valve (801) is arranged on the emptying pipeline (80), and the emptying pipeline (80) is provided with an emptying valve (801) used for controlling the opening and closing of the emptying pipeline.
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| CN202210233769.2A CN114674720A (en) | 2022-03-10 | 2022-03-10 | Gas transmittance testing device |
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| CN202210233769.2A CN114674720A (en) | 2022-03-10 | 2022-03-10 | Gas transmittance testing device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112543A (en) * | 2022-06-29 | 2022-09-27 | 济南赛成电子科技有限公司 | System and method for testing water vapor transmission rate of plastic film and thin plate by pressure sensor method |
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2022
- 2022-03-10 CN CN202210233769.2A patent/CN114674720A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112543A (en) * | 2022-06-29 | 2022-09-27 | 济南赛成电子科技有限公司 | System and method for testing water vapor transmission rate of plastic film and thin plate by pressure sensor method |
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