CN216978747U - A cavity structures and gas permeation tester for gas permeation test - Google Patents
A cavity structures and gas permeation tester for gas permeation test Download PDFInfo
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- CN216978747U CN216978747U CN202123383111.XU CN202123383111U CN216978747U CN 216978747 U CN216978747 U CN 216978747U CN 202123383111 U CN202123383111 U CN 202123383111U CN 216978747 U CN216978747 U CN 216978747U
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Abstract
The utility model provides a cavity structure for gas permeation test and a gas permeation tester, wherein the cavity structure comprises: the device comprises a first test cavity, a second test cavity and an expansion cavity, wherein the expansion cavity is positioned between the first test cavity and the second test cavity; the opening of the expansion cavity is opposite to the opening of the second testing cavity, the air inlet of the expansion cavity is opposite to the opening of the first testing cavity, and a sample is placed between the opening of the first testing cavity and the air inlet of the expansion cavity; according to the utility model, the extension cavity is added between the first test cavity and the second test cavity, the test area is kept unchanged, the test volume is increased, and the test range is extended under the condition that the test precision is unchanged.
Description
Technical Field
The utility model relates to the technical field of gas permeation testing, in particular to a cavity structure for gas permeation testing and a gas permeation tester.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The principle of the differential pressure method for testing gas permeation is as follows: adopting a differential pressure method testing principle, placing a pre-processed sample between an upper testing cavity and a lower testing cavity, clamping, firstly carrying out vacuum treatment on a low-pressure cavity (lower cavity), and then vacuumizing the whole system; when the specified vacuum degree is reached, the testing lower cavity is closed, test gas with certain pressure is filled into the high-pressure cavity (upper cavity), and a constant pressure difference (adjustable) is formed on two sides of the sample; the gas permeates from the high-pressure side to the low-pressure side under the action of the pressure difference gradient, and various barrier parameters of the tested sample are obtained through monitoring and analyzing the pressure in the low-pressure side.
At present, a pressure difference method gas permeation test system on the market is mainly suitable for gas permeability tests of various materials such as plastic films, plastic composite films, paper-plastic composite films, co-extruded films, aluminized films, aluminum foils, aluminum foil composite films and the like.
The inventor finds that the air permeability of the film material is divided into high barrier property and low barrier property, and when the low barrier property material is measured, the accuracy requirement on the sensor is not high, but a larger range is required; when measuring materials with high barrier property, the requirement on the accuracy of the sensor is high, but the measuring range of the sensor with high accuracy is often low.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a cavity structure for gas permeation test and a gas permeation tester.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides in a first aspect a chamber structure for gas permeation testing.
A chamber structure for gas permeation testing, comprising: the device comprises a first test cavity, a second test cavity and an expansion cavity, wherein the expansion cavity is positioned between the first test cavity and the second test cavity;
the opening of the expansion cavity is opposite to the opening of the second testing cavity, the air inlet of the expansion cavity is opposite to the opening of the first testing cavity, and a sample is placed between the opening of the first testing cavity and the air inlet of the expansion cavity.
Furthermore, a first groove is formed in the expansion cavity, and a positioning boss matched with the first groove is arranged on the second testing cavity.
Furthermore, the outer edge of the expansion cavity is arc-shaped.
Furthermore, an operating handle is arranged on the outer side of the expansion cavity.
Further, the outside of extension cavity is equipped with the handle.
Furthermore, a second groove for placing a first sealing ring is formed in the first testing cavity, and the first sealing ring is arranged between the first testing cavity and the sample.
Furthermore, the first sealing rings at least comprise two groups, and the first sealing rings of each group are arranged in a concentric circle shape.
Furthermore, a third groove for placing a second sealing ring is formed in the extension cavity, and the second sealing ring is arranged between the extension cavity and the second testing cavity.
Furthermore, filter paper or a porous membrane is arranged between the expansion cavity and the sample.
Further, the diameter of the filter paper or porous membrane is smaller than the diameter of the innermost first seal ring.
Furthermore, a first air path is formed in the first testing cavity, a second air path is formed in the second testing cavity, and the second air path is communicated with the sensing element.
In a second aspect, the utility model provides a gas permeation tester comprising the chamber structure of the first aspect of the utility model.
Compared with the prior art, the utility model has the beneficial effects that:
1. according to the cavity structure for gas permeation testing and the gas permeation tester, the expansion cavity is additionally arranged between the first testing cavity and the second testing cavity, the testing area is kept unchanged, the testing volume is increased, and the testing range is expanded under the condition that the testing precision is unchanged.
2. The cavity structure for gas permeation test and the gas permeation tester do not need to use an expansion cavity when measuring high-barrier materials, use the expansion cavity when measuring low-barrier materials, and do not need to change the whole device, thereby realizing multiple purposes of one machine.
3. According to the cavity structure for gas permeation testing and the gas permeation tester, the plurality of groups of first sealing rings are arranged between the first testing cavity and the test sample, so that a better sealing effect is achieved, and the testing data are more accurate.
4. According to the cavity structure for gas permeation test and the gas permeation tester, the filter paper is placed between the expansion cavity and the test sample, so that the test gas is fully contacted with the sample, the gas uniformly penetrates through the sample, and the test data are more accurate.
5. According to the cavity structure for gas permeation testing and the gas permeation tester, the first groove is formed in the expansion cavity, the positioning boss matched with the first groove is arranged on the second testing cavity, accurate positioning can be achieved when the expansion cavity is placed, working efficiency is improved, and accuracy of a testing result is improved.
6. According to the cavity structure for gas permeation testing and the gas permeation tester, the outer edge of the expanded cavity is arc-shaped or is provided with the operating handle or the handle, so that an operator can take the cavity structure conveniently, and the operating convenience is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are included to illustrate an exemplary embodiment of the utility model and not to limit the utility model.
Fig. 1 is a schematic structural diagram of a chamber for gas permeation testing according to an embodiment of the present invention.
The device comprises a first test cavity and a second test cavity, wherein 1, the first test cavity is formed in the first test cavity; 2. a first seal ring; 3. a sample; 4. expanding the cavity; 5. a second seal ring; 6. a second test chamber; 7. a sensor; 8. a joint; 9. a first gas path; 10. a first test chamber air chamber; 11. filtering paper; 12. expanding the cavity air chamber; 13. a second gas path; 14. a second test chamber plenum.
Detailed Description
The utility model is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example 1:
as shown in fig. 1, embodiment 1 of the present invention provides a chamber structure for gas permeation testing, including a testing chamber and an expansion chamber 4, where the testing chamber includes a first testing chamber 1 and a second testing chamber 6 with openings, respectively, the opening of the first testing chamber 1 is opposite to the opening of the second testing chamber 6, the expansion chamber 4 is located on the opening of the second testing chamber 6, and a sample 3 is placed between the expansion chamber 4 and the opening of the first testing chamber 1.
Wherein the first test chamber 1 comprises a first test chamber air chamber 10, the expansion chamber 4 comprises an expansion chamber air chamber 12, and the second test chamber 6 comprises a second test chamber air chamber 14.
The expansion cavity 4 is provided with a first groove, the second test cavity 6 is provided with a boss matched with the first groove, and the expansion cavity can be placed in the accurate positioning process.
The outer edge of the expansion cavity 4 is arc-shaped, so that an operator can conveniently take the expansion cavity.
It is understood that in other embodiments, an operating handle or a handle may be added to the expanded cavity 4 to facilitate taking, and a person skilled in the art may select the operating handle or the handle according to specific working conditions, which is not described herein again.
A first sealing ring 2 is arranged between the first testing cavity 1 and the sample 3, and a second groove for placing the first sealing ring 2 is formed in the first testing cavity 1.
A second sealing ring 5 is arranged between the expansion cavity 4 and the second testing cavity 6, and a third groove for placing the second sealing ring 5 is formed in the expansion cavity 4.
In this embodiment, there are two sets of the first seal rings 2, which are arranged concentrically.
It can be understood that, in order to achieve a better sealing effect and to make the test result more accurate, the first sealing ring 2 may also have multiple groups, for example, three, four or five groups, and those skilled in the art may select according to specific working conditions, and details are not described here.
In this embodiment, a filter paper 11 may be placed between the expansion chamber 4 and the sample 3.
It can be understood that, in order to make the test gas contact with the sample sufficiently and make the gas permeate the sample uniformly, a porous membrane may also be placed, and those skilled in the art may select the porous membrane according to specific working conditions, which are not described herein again.
In order to prevent the external air from permeating into the second testing chamber 6 through the edge of the filter paper 11 or the porous membrane, which affects the testing result, the diameter of the filter paper 11 or the porous membrane is smaller than the diameter of the innermost first sealing ring 2.
In this embodiment, the first testing chamber 1 is provided with a first air passage 9, the end of the first air passage 9 is provided with a joint 8, the second testing chamber 6 is provided with a second air passage 13, and the second air passage 13 is communicated with the sensor 7 for high-precision gas permeation testing.
The gas permeability Q is determined according to GB/T1038-2000 pressure differential method for testing gas permeability of plastic films and sheetsgThe calculation formula of (2) is as follows:
in the formula: qgGas permeability of material, cm3/m2d.Pa; Δ p/Δ t-the arithmetic mean of the changes in the gas pressure in the low-pressure chamber per unit time, Pa/h, when passing through steadily; v-volume of low-pressure chamber, cm3(ii) a S-test area of sample, m2(ii) a T-test temperature, K; p is a radical of formula1－p2-the pressure difference, Pa, across the sample; t is0，p0Temperature (273.15K) and pressure (1.0133X 10) at Standard State5Pa); Δ p is measured by a high precision sensor.
For high barrier materials, QgSmaller value, Q for low barrier materialgThe value is large.
From the above formula, it can be seen that, when the range of the sensor 7 is kept constant and other parameters such as the test area S of the sample are kept constant, the volume V of the low-pressure chamber is increased to measure a high gas permeation QgThereby achieving the purpose of expanding the test range.
When measuring high barrier material, do not need to use and expand the chamber, directly place the sample on second test cavity 6, when measuring low barrier material, use extension cavity 4.
Example 2:
embodiment 2 of the present invention provides a gas permeation tester, including the cavity structure described in embodiment 1 of the present invention.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A cavity structure for gas permeation test, its characterized in that:
the method comprises the following steps: the device comprises a first test cavity, a second test cavity and an expansion cavity, wherein the expansion cavity is positioned between the first test cavity and the second test cavity;
the opening of the expansion cavity is opposite to the opening of the second testing cavity, the air inlet of the expansion cavity is opposite to the opening of the first testing cavity, and a sample is placed between the opening of the first testing cavity and the air inlet of the expansion cavity.
2. The chamber structure for gas permeation testing according to claim 1, wherein:
a first groove is formed in the extension cavity, and a positioning boss matched with the first groove is arranged on the second testing cavity.
3. The chamber structure for gas permeation testing according to claim 1, wherein:
the outer edge of the expansion cavity is arc-shaped;
alternatively, the first and second electrodes may be,
an operating handle is arranged on the outer side of the expansion cavity;
alternatively, the first and second liquid crystal display panels may be,
the outside of the expansion cavity is provided with a handle.
4. The chamber structure for gas permeation testing according to claim 1, wherein:
a second groove used for placing a first sealing ring is formed in the first testing cavity, and the first sealing ring is arranged between the first testing cavity and the sample.
5. The chamber structure for gas permeation testing according to claim 4, wherein:
the first sealing rings at least comprise two groups, and the first sealing rings of each group are arranged in a concentric circle shape.
6. The chamber structure for gas permeation testing according to claim 1, wherein:
and a third groove for placing a second sealing ring is formed in the extension cavity, and the second sealing ring is arranged between the extension cavity and the second testing cavity.
7. The chamber structure for gas permeation testing according to claim 1, wherein:
and filter paper or a porous membrane is arranged between the expansion cavity and the sample.
8. The chamber structure for gas permeation testing according to claim 7, wherein:
the diameter of the filter paper or porous membrane is smaller than the diameter of the innermost first seal ring.
9. The chamber structure for gas permeation testing according to claim 1, wherein:
a first air path is formed in the first testing cavity, a second air path is formed in the second testing cavity, and the second air path is communicated with the sensing element.
10. A gas permeation tester is characterized in that:
comprising the cavity structure of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123383111.XU CN216978747U (en) | 2021-12-29 | 2021-12-29 | A cavity structures and gas permeation tester for gas permeation test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123383111.XU CN216978747U (en) | 2021-12-29 | 2021-12-29 | A cavity structures and gas permeation tester for gas permeation test |
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| CN216978747U true CN216978747U (en) | 2022-07-15 |
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| CN202123383111.XU Active CN216978747U (en) | 2021-12-29 | 2021-12-29 | A cavity structures and gas permeation tester for gas permeation test |
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