CN115308104A

CN115308104A - Gas permeability tester

Info

Publication number: CN115308104A
Application number: CN202210762693.2A
Authority: CN
Inventors: 王贵华
Original assignee: Guangdong Yite Technology Co ltd
Current assignee: Guangdong Yite Technology Co ltd
Priority date: 2022-06-29
Filing date: 2022-06-29
Publication date: 2022-11-08

Abstract

The invention discloses a gas transmittance tester, which comprises a machine shell and at least one testing unit, wherein the testing unit comprises a testing seat, a connecting seat and a heat-insulating cover which are all arranged in the machine shell; a first sealing element which is covered on the air inlet hole in a covering mode is arranged between the connecting seat and the testing seat, two opposite ends of the first sealing element can be respectively attached and sealed with the connecting seat and the testing seat, a first through hole which is communicated with the air inlet hole and is used for sealing and communicating the testing assembly is arranged on the connecting seat, and a second sealing element which is covered on the first sealing element in a covering mode and is respectively attached and sealed with the connecting seat and the testing seat at two opposite end faces is further arranged between the testing seat and the connecting seat; the heat preservation cover dustcoat is formed with one deck heat preservation space between the outer wall of test seat and inner wall and test seat to avoid outside temperature to influence the temperature of test intracavity when effectively avoiding outside air to get into the test intracavity.

Description

Gas permeability tester

Technical Field

The invention relates to the field of gas transmittance tests, in particular to a gas transmittance tester.

Background

The gas permeability tester is generally used for testing the gas permeability of packing materials or other new materials, the differential pressure method is one of the methods for testing the gas permeability, and the vacuum method is the most representative method in the differential pressure method. The test principle is that a test cavity is divided into an upper cavity and a lower cavity by a sample, then test gas is filled into the upper cavity to form a high-pressure cavity, and the lower cavity forms a low-pressure cavity, so that pressure difference is formed between the high-pressure cavity and the low-pressure cavity. The high-pressure cavity is isolated from the low-pressure cavity by a sample (a film sample or a slice sample), the pressure of the low-pressure cavity is changed by permeating the sample from the high-pressure cavity into the low-pressure cavity by utilizing test gas, and the transmission amount of the test gas through the sample can be obtained by measuring the pressure change amount in the low-pressure cavity by using a high-progress vacuum gauge.

At present, current gas permeability tester includes test seat and connecting seat, the outside seal of test seat, inside is formed with foretell test chamber, the upper surface of test seat is provided with the inlet port with the test chamber intercommunication, the connecting seat laminating sets up the upper surface at the casing, the sealing washer has between connecting seat and the test seat, and this sealing washer dustcoat in the inlet port, the relative both ends of sealing washer are sealed with connecting seat and test seat laminating respectively, have the air vent with the inlet port intercommunication on the connecting seat, this air vent is used for welding test subassembly and communicates with the test subassembly. Therefore, in the testing process of the existing gas transmittance tester, the sealing ring is easy to generate leakage problems due to the fact that the sealing ring is deformed, aged, insufficient in pressure and the like when being contacted with the outside air for a long time; meanwhile, the temperature in the test cavity is influenced by the external temperature to influence the test effect in the test cavity.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a gas transmittance tester which can effectively prevent outside air from entering a test cavity and can also effectively prevent the outside temperature from influencing the temperature in the test cavity, thereby avoiding influencing the test effect in the test cavity.

The purpose of the invention is realized by adopting the following technical scheme:

a gas transmission rate tester comprising:

a housing and at least one test unit, the test unit comprising:

the test seat is arranged in the machine shell, the exterior of the test seat is sealed, a test cavity used for measuring the gas transmittance of a sample is formed in the test seat, and one surface of the test seat is provided with an air inlet communicated with the test cavity;

the testing device comprises a shell, a connecting seat, a first sealing element, a second sealing element and a testing seat, wherein the connecting seat is arranged in the shell, a first sealing element is arranged between the connecting seat and the testing seat, the first sealing element covers the air inlet, two opposite ends of the first sealing element can be respectively attached and sealed with the connecting seat and the testing seat, a first through hole communicated with the air inlet is formed in the connecting seat, the first through hole is used for being hermetically communicated with a testing assembly, the second sealing element is also arranged between the testing seat and the connecting seat, and the second sealing element covers the first sealing element, two opposite end faces of the second sealing element can be respectively attached and sealed with the connecting seat and the testing seat;

the heat preservation cover is arranged in the machine shell and covers the test seat, and a heat preservation space is formed between the inner wall of the heat preservation cover and the outer wall of the test seat.

Furthermore, the test unit also comprises a power device arranged in the casing and used for driving the test seat to move and be attached to the connecting seat, so that the test seat and the connecting seat are sealed through the first sealing element and the second sealing element.

Furthermore, the test seat is movably arranged in the heat-insulating cover, so that the test seat can be moved out of the heat-insulating cover to the outside of the machine shell.

Furthermore, a protective sealing cavity is formed between the first sealing element and the second sealing element, a second through hole communicated with the protective sealing cavity is further formed in the connecting seat, the second through hole is communicated with a vacuumizing device in a sealing mode, and the vacuumizing device is used for vacuumizing the protective sealing cavity.

Furthermore, an annular cavity is circumferentially arranged on the outer peripheral side of the test cavity, a third sealing element is arranged between the annular cavity and the test cavity to seal a gap between the annular cavity and the test cavity, a fourth sealing element is arranged on the outer side of the annular cavity to block the communication between the annular cavity and the outside, an air suction hole communicated with the annular cavity is arranged in the protection sealing cavity, and the air suction hole is communicated with the second through hole.

Furthermore, a first annular groove used for installing the first sealing element is formed in the outer peripheral side of the air inlet hole; and a second annular groove for mounting the second sealing element is arranged on the outer peripheral side of the first annular groove.

Further, the heat preservation cover comprises a cover body, wherein a heat preservation layer covers the inner wall surface of the cover body, or a heat preservation layer covers the outer wall of the cover body.

Furthermore, a temperature control unit is arranged on the test seat and used for detecting and adjusting the temperature of the test seat.

Further, the temperature control unit comprises a temperature detection module for detecting the temperature in the test chamber.

Further, the temperature control unit further comprises a temperature adjusting module, and the temperature adjusting module is used for adjusting the temperature in the test cavity.

Compared with the prior art, the invention has the beneficial effects that:

1. according to the invention, the second sealing element is covered on the first sealing element, and the two opposite end surfaces of the second sealing element are respectively attached and sealed with the connecting seat and the shell, so that a layer of sealed protection space is formed between the second sealing element and the first sealing element, thus the external air is effectively prevented from entering the protection space from a gap between the shell and the connecting seat, the external air is buffered to enter the air inlet hole, meanwhile, the first sealing element can be prevented from directly contacting with the external air through the protection space, the aging of the first sealing element is effectively buffered, and the external air is difficult to enter the test cavity because the first through hole on the connecting seat is used for hermetically communicating with the test component, thus the external air can be effectively prevented from entering the test cavity, and the test effect in the test cavity is prevented from being influenced.

2. According to the invention, the heat-insulating space is formed between the test seat and the nature through the heat-insulating cover, the test cavity is isolated from the outside of the heat-insulating cover by the heat-insulating space, and when the temperature fluctuation of the nature is large, the temperature in the test cavity is not greatly influenced, so that the influence of the external temperature on the temperature in the test cavity is effectively avoided, and the test effect in the test cavity is prevented from being influenced.

Drawings

FIG. 1 is a schematic view of the internal structure of a gas permeability tester according to the present invention;

FIG. 2 is a cross-sectional view of a test socket according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a test socket and a connecting socket according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an upper test body according to an embodiment of the present invention;

FIG. 5 is a schematic view of another angular configuration of an upper test body according to an embodiment of the present invention;

FIG. 6 is a schematic view of a connecting socket according to an embodiment of the present invention;

FIG. 7 is a schematic view of a connection structure of a test socket and a connecting socket according to an embodiment of the present invention;

FIG. 8 is a schematic view of a first seal according to an embodiment of the present invention;

FIG. 9 is a schematic diagram of a second seal according to an embodiment of the present invention;

FIG. 10 is a schematic view of a heat-retaining cover and a test socket according to an embodiment of the present invention;

FIG. 11 is a schematic view of a bottom plate and a movable base of the cover according to an embodiment of the present invention;

FIG. 12 is a schematic view of the gas permeability tester according to the present invention.

In the figure: 10. a housing; 20. a test unit; 201. a test seat; 2011. an upper test body; 20110. a first annular groove; 20111. a second annular groove; 20112. protecting the sealed cavity; 20113. an air intake; 20114. an air exhaust hole; 2012. a lower test subject; 202. a connecting seat; 2021. a first through hole; 2022. a second through hole; 203. a heat-preserving cover; 2031. a cover body; 20310. a base plate; 2032. a heat-insulating layer; 21. a test chamber; 211. an upper chamber; 212. a lower cavity; 22. a first seal member; 23. a second seal member; 24. an annular cavity; 25. a third seal member; 26. a fourth seal; 30. a sample; 40. a temperature sensor; 41. a temperature adjustment module; 42. a display device; 50. a guide rail; 51. a movable seat; 52. a linear drive device; 53. and a power device.

Detailed Description

The present invention is described with priority in conjunction with the accompanying drawings and the detailed description, and it should be noted that, without conflict, various embodiments or technical features described below may be arbitrarily combined to form a new embodiment.

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", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, 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 by those skilled in the art according to specific situations.

The implementation mode is as follows:

referring to fig. 1 to 12, the present invention shows a gas transmittance tester, which includes a housing 10 and at least one testing unit 20; specifically, the test unit 20 includes a test socket 201, a connection socket 202, and a heat-retaining cover 203. The test seat 201 is arranged in the machine shell 10, the exterior of the test seat 201 is sealed, a test cavity 21 for measuring the gas transmittance of the sample 30 is formed in the test seat 201, and an air inlet 20113 communicated with the test cavity 21 is arranged on one surface of the test seat 201; the connecting base 202 is arranged in the machine shell 10, a first sealing element 22 is arranged between the connecting base 202 and the test base 201, the first sealing element 22 is covered on an air inlet 20113, two opposite ends of the first sealing element 22 can be respectively attached and sealed with the connecting base 202 and the test base 201, a first through hole 2021 communicated with the air inlet 20113 is arranged on the connecting base 202, the first through hole 2021 is used for being communicated with a test assembly in a sealing mode, a second sealing element 23 is further arranged between the test base 201 and the connecting base 202, and two opposite end faces of the second sealing element 23 covered on the first sealing element 22 and the second sealing element 23 can be respectively attached and sealed with the connecting base 202 and the test base 201; the heat-insulating cover 203 is arranged in the casing 10 and covers the test seat 201, and a heat-insulating space is formed between the inner wall of the heat-insulating cover 203 and the outer wall of the test seat 201.

Therefore, when the gas transmittance tester is used, the second sealing element 23 covers the first sealing element 22, and the two opposite end faces of the second sealing element 23 are respectively attached and sealed with the connecting seat 202 and the shell, so that a layer of sealed protection space is formed between the second sealing element 23 and the first sealing element 22, thereby effectively preventing external air from entering the protection space from a gap between the shell and the connecting seat 202, buffering the external air from entering the air inlet 20113, and meanwhile, preventing the first sealing element 22 from directly contacting with the external air through the protection space, and effectively buffering the aging of the first sealing element 22; since the first through hole 2021 of the connecting seat 202 is used for sealing and communicating the testing component, that is, the position of the first through hole 2021 is completely isolated from the outside, the outside air is difficult to enter the testing chamber 21, so that the outside air can be effectively prevented from entering the testing chamber 21, and the testing effect in the testing chamber 21 is prevented from being influenced. In addition, a layer of heat insulation space is formed between the test seat 201 and the nature through the heat insulation cover 203, the heat insulation space isolates the test cavity 21 from the outside of the heat insulation cover 203, and when the temperature fluctuation of the nature is large, the temperature in the test cavity 21 cannot be greatly influenced, so that the influence of the external temperature on the temperature in the test cavity 21 is effectively avoided, and the test effect in the test cavity 21 is prevented from being influenced.

In this embodiment, the testing unit 20 further includes a power device 53 disposed in the casing 10, wherein the power device 53 is configured to drive the testing socket 201 to move and attach to the connecting socket 202, so that the upper surface of the testing socket 201 attaches to the lower surface of the connecting socket 202, and the two opposite end surfaces of the first sealing member 22 and the second sealing member 23 respectively attach to and seal with the upper surface of the testing socket 201 and the lower surface of the connecting socket 202. That is, the test socket 201 and the connection socket 202 are sealed by the first sealing member 22 and the second sealing member 23, and the power for driving the first sealing member 22 and the second sealing member 23 to respectively attach to the upper surface of the test socket 201 and the lower surface of the connection socket 202 comes from the power device 53, so as to achieve the attaching and sealing effect between the connection socket 202 and the test socket 201. Therefore, the first sealing member 22 and the second sealing member 23 of the present embodiment can be detached, and after a period of use, the first sealing member 22 and the second sealing member 23 can be replaced periodically, so as to ensure that the first sealing member 22 and the second sealing member 23 do not age or deform.

In this embodiment, the power plant is a cylinder. Of course, in other embodiments, the power device may also be a linear driving motor, which is not limited herein. Therefore, it is obvious to those skilled in the art that the power unit can be properly modified and still fall within the scope of the present invention.

In this embodiment, the test socket 201 includes an upper test main body 2011 and a lower test main body 2012, the upper test main body 2011 and the lower test main body 2012 are attached and sealed, and of course, the upper test main body 2011 can be detached from the lower test main body 2012. An upper cavity 211 is arranged on the upper surface of the upper test main body 2011, a lower cavity 212 corresponding to the upper cavity 211 is arranged on the lower surface of the lower test main body 2012, the upper cavity 211 and the lower cavity 212 form the test cavity 21, and the lower cavity 212 are separated by a sample 30 (a film sample or a sheet sample) and can form a pressure difference; the testing assembly (not shown) comprises a connecting pipeline, a first vacuum sensor and an air source, one end of the connecting pipeline is in welding sealing communication with the first through hole 2021, the other end of the connecting pipeline is in communication with the air source, and the first vacuum sensor is arranged on the connecting pipeline and used for detecting the vacuum degree in the testing cavity 21.

The gas transmittance test process of the sample 30 is as follows, the sample 30 is placed between an upper test main body 2011 and a lower test main body 2012, the sample 30 divides the test cavity 21 into the upper cavity 211 and the lower cavity 212, the edges of the two opposite ends of the sample 30 are pressed and sealed by a third sealing element 25 arranged on the outer peripheral side of the test cavity 21, and after the upper cavity 211 and the lower cavity 212 are vacuumized, a switch of a gas source is opened, so that the test gas is introduced into the upper cavity 211 through a connecting pipeline, and thus, the upper cavity 211 and the lower cavity 212 can form a pressure difference, namely, the upper cavity 211 is a high-pressure chamber, and the lower cavity 212 is a low-pressure chamber; after the upper chamber 211 is filled with the testing gas, the switch of the gas source is closed, and the gas transmission amount of the testing gas can be measured by detecting the pressure variation in the low pressure chamber through the vacuum sensor communicated with the lower chamber 212. It should be noted that the vacuum pumping of the upper chamber 211 and the lower chamber 212 is prior art, and specifically, reference may be made to a gas transmittance tester and a leak-proof structure thereof disclosed in chinese patent (publication No. CN 207689327U), which will not be described herein.

In this embodiment, a protective sealing cavity 20112 is formed between the first sealing element 22 and the second sealing element 23, a second through hole 2022 communicated with the protective sealing cavity 20112 is further provided on the connecting seat 202, the second through hole 2022 is hermetically communicated with a vacuum pumping device, and the vacuum pumping device is configured to vacuum the protective sealing cavity 20112. Therefore, when the second sealing element 23 is deformed, aged, insufficient in pressure and the like, and outside air enters the protective sealing cavity 20112, the air in the protective sealing cavity 20112 can be pumped out through the vacuum pumping device, so that the air is prevented from entering the air inlet 20113, the outside air is further prevented from entering the test cavity 21, and the leakage phenomenon is prevented.

Of course, in another embodiment, a seal ring covering the second seal 23 may be provided on the outer peripheral side of the second seal 23, and a single protective seal cavity 20112 may be formed between the second seal 23 and the seal ring. Therefore, the protective seal cavity 20112 of the present embodiment is not limited to the one-layer structure shown in the drawings, and the inventors can appropriately change the number of layers of the protective seal cavity 20112 according to the actual situation.

In this embodiment, an annular cavity 24 is circumferentially arranged on the outer peripheral side of the test cavity 21, the third sealing element 25 is arranged between the annular cavity 24 and the test cavity 21 to seal a gap between the annular cavity 24 and the test cavity 21, a fourth sealing element 26 is arranged on the outer peripheral side of the annular cavity 24 to seal the communication between the annular cavity 24 and the outside, an air suction hole 20114 communicated with the annular cavity 24 is arranged in the protection sealing cavity 20112, and the air suction hole 20114 is communicated with the second through hole 2022. It can be seen that by providing the annular cavity 24, the test chamber 21 can be further isolated from the outside, and outside air can be further prevented from entering the test chamber 21. After air enters the annular cavity 24, the air pumping hole 20114 is communicated with the second through hole 2022, so that the air in the annular cavity 24 can be pumped out by the vacuum pumping device, and the test cavity 21 can be completely isolated from the outside, so that the gas transmittance tester has better leakage prevention performance.

In this embodiment, the vacuum pumping device (not shown) includes a vacuum pump and a vacuum pipe, one end of the vacuum pipe is in sealed communication with the second through hole 2022, and the other end of the vacuum pipe is in communication with the vacuum pump. When air in the protective sealing cavity 20112 needs to be extracted, the vacuum pump is started to extract vacuum in the protective sealing cavity 20112, and no external air breaks through the line of defense of the first sealing element 22 to enter the test cavity 21 all the time.

In this embodiment, the vacuum pipe and the second through hole 2022 are connected and sealed by welding, so that the sealing effect at the connection between the vacuum pipe and the second through hole 2022 is better. Of course, the vacuum pipe is provided with a vacuum detection unit, and the vacuum detection unit of this embodiment is a vacuum sensor, and is used for detecting the vacuum degree in the protective sealed cavity 20112, so that the user can know the condition of the vacuum degree in the protective sealed cavity 20112 in real time, and the vacuum detection unit is convenient to operate and use.

Of course, in other embodiments, the vacuum pipe and the second through hole 2022 may be hermetically connected by a vacuum joint, which is not limited herein. Therefore, it is within the scope of the present invention for those skilled in the art to reasonably modify the sealing communication structure between the vacuum pipe and the second through hole 2022.

In the present embodiment, a first annular groove 20110 for installing the first sealing member 22 is opened on the outer peripheral side of the intake port 20113; the outer peripheral side of the first annular groove 20110 is provided with a second annular groove 20111 for attaching the second seal 23. Specifically, a first annular groove 20110 and a second annular groove 20111 are provided on the upper surface of the upper test body 2011, and the installation of the first seal 22 and the installation of the second seal 23 can be facilitated through the first annular groove 20110 and the second annular groove 20111, respectively. As can be seen, the first seal 22 and the second seal 23 are both annular seal rings.

Of course, in other embodiments, the first annular groove 20110 and the second annular groove 20111 may be disposed on the surface of the connection socket 202 facing the upper test body 2011, which is not limited herein. Therefore, it is within the scope of the present invention for a person skilled in the art to reasonably change the positions of the first annular groove 20110 and the second annular groove 20111.

In this embodiment, the heat-insulating cover 203 includes a cover body 2031, and a heat-insulating layer 2032 covers an outer wall of the cover body 2031, so that the temperature of the nature will not affect the temperature in the test cavity 21 through the heat-insulating layer 2032. Specifically, the heat preservation layer 2032 of this embodiment is a rock wool heat preservation layer 2032, and the heat preservation effect of adopting the rock wool heat preservation layer 2032 is better.

Of course, in other embodiments, the insulating layer 2032 may also be an STP insulating board; an insulating layer 2032 may be covered on the outer wall of the cover 2031, and a heat insulating space may also be formed between the outer wall of the housing and the inner wall of the heat insulating cover 203, which is not limited herein, so that it is within the scope of the present invention for those skilled in the art to reasonably change the position of the insulating layer 2032.

In this embodiment, a temperature control unit is disposed on the test socket 201, and the temperature control unit is used to detect and adjust the temperature of the test socket 201. Specifically, the test socket 201 is a metal part, and since the metal part has a heat transfer performance, the temperature in the test socket 201 can be detected and adjusted by the temperature control unit.

In this embodiment, the temperature control unit includes a temperature detection module for detecting the temperature in the test chamber 21. That is, it can be understood that the temperature in the testing chamber 21 can be detected by detecting the temperature of the testing socket 201 through the temperature detecting module. Specifically, the temperature detection module includes temperature sensor 40, display device 42 and circuit board, and temperature sensor 40 and circuit board all locate the inside of casing 10, and display device 42 locates the outside of casing 10, and temperature sensor 40 and circuit board electric connection, temperature sensor 40 are located and are used for detecting the temperature in test cavity 21 on test seat 201, and display device 42 locates the cover 203 outside and with circuit board electric connection that keeps warm to make display device 42 can show the result that temperature sensor 40 detected. It can be seen that the temperature sensor 40 and the display device 42 are controlled by the circuit board, the temperature sensor 40 detects the temperature on the test socket 201 and feeds back the detection result to the circuit board, and the circuit board displays the result fed back by the temperature sensor 40 on the display device 42 to measure the temperature in the test chamber 21.

In this embodiment, the temperature control unit further includes a temperature adjustment module 41, and the temperature adjustment module 41 is disposed on the test socket 201 and controlled by the circuit board, so that the temperature adjustment module 41 can heat or cool the test socket 201. That is, it can be understood that, when the temperature in the test cavity 21 is higher, the circuit board controls the temperature adjustment module 41 to cool the test seat 201, so as to achieve the purpose of cooling the test cavity 21; when the temperature in the test chamber 21 is low, the circuit board controls the temperature adjustment module 41 to heat the test socket 201, so as to heat the test chamber 21, and control the temperature in the test chamber 21 within a preset range. In conclusion, the heat-insulating cover 203 and the temperature adjusting module 41 of the present invention perform a dual temperature adjusting function, and if there is no outer heat-insulating cover 203, when the temperature in the nature fluctuates greatly, the temperature adjusting module 41 will also fluctuate greatly in adjusting the temperature of the test socket 201, so that the temperature in the test cavity 21 is unstable, and the test effect in the test cavity 21 is affected.

It should be noted that the temperature adjustment module 41 is in the prior art and the structure and temperature control principle thereof are not described herein.

In this embodiment, the test socket 201 is movably disposed in the heat-insulating cover 203, so that the test socket 201 can be moved out of the casing 10 from the heat-insulating cover 203. Specifically, a guide rail 50 is disposed on the bottom plate 20310 of the housing 2031, the guide rail 50 is disposed along the length direction of the bottom plate 20310 of the housing 2031, a movable seat 51 is slidably connected to the guide rail 50, and the lower test main body 2012 is fixed on the movable seat 51, so that the test seat 201 can be moved out of the housing 10 along with the movement of the movable seat 51 along the guide rail 50, so as to place the test sample 30 in the test chamber 21. A linear driving device 52 is further disposed in the cover 2031, and the linear driving device 52 is used for driving the movable base 51 to move along the guide rail 50, so as to achieve the effect that the test socket 201 can be moved out of the housing 10.

In this embodiment, the linear driving device 52 is a linear driving motor, but may be a telescopic cylinder in other embodiments, which is not limited herein. Therefore, it is obvious to those skilled in the art that the structure of the linear driving device 52 can be modified appropriately, and the linear driving device is also within the scope of the present invention.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. Gas transmission rate tester, its characterized in that includes:

a housing (10) and at least one test unit (20), the test unit (20) comprising:

the testing seat (201) is arranged in the machine shell (10), the testing seat (201) is sealed at the outside and is internally provided with a testing cavity (21) for measuring the gas transmittance of the sample (30), and one surface of the testing seat (201) is provided with an air inlet (20113) communicated with the testing cavity (21);

the testing device comprises a connecting seat (202) arranged in the machine shell (10), wherein a first sealing element (22) is arranged between the connecting seat (202) and a testing seat (201), the first sealing element (22) is covered on an air inlet (20113) and two opposite ends of the first sealing element can be respectively attached and sealed with the connecting seat (202) and the testing seat (201), a first through hole (2021) communicated with the air inlet (20113) is formed in the connecting seat (202), the first through hole (2021) is used for hermetically communicating a testing assembly, a second sealing element (23) is further arranged between the testing seat (201) and the connecting seat (202), and the second sealing element (23) is covered on the first sealing element (22) and two opposite end faces of the second sealing element can be respectively attached and sealed with the connecting seat (202) and the testing seat (201);

the heat preservation cover (203) is arranged in the machine shell (10) and covers the test seat (201), and a heat preservation space is formed between the inner wall of the heat preservation cover (203) and the outer wall of the test seat (201).

2. The gas permeability tester of claim 1, wherein the testing unit (20) further comprises a power device disposed in the casing (10) for driving the testing seat (201) to move to fit the connecting seat (202), so that the testing seat (201) and the connecting seat (202) are sealed by the first sealing member (22) and the second sealing member (23).

3. The gas permeability tester of claim 1, wherein the test socket (201) is movably disposed in the heat-insulating cover (203) so that the test socket (201) can be moved out of the housing (10) from the heat-insulating cover (203).

4. The gas transmittance tester according to claim 1, wherein a protective sealing cavity (20112) is formed between the first sealing element (22) and the second sealing element (23), a second through hole (2022) communicated with the protective sealing cavity (20112) is further disposed on the connecting seat (202), and the second through hole (2022) is hermetically communicated with a vacuum pumping device, which is used for pumping vacuum in the protective sealing cavity (20112).

5. The gas transmittance tester according to claim 4, wherein an annular cavity (24) is circumferentially arranged on the outer peripheral side of the test chamber (21), a third sealing member (25) is arranged between the annular cavity (24) and the test chamber (21) to seal a gap between the annular cavity (24) and the test chamber (21), a fourth sealing member (26) is arranged on the outer side of the annular cavity (24) to seal the communication between the annular cavity (24) and the outside, a pumping hole (20114) communicated with the annular cavity (24) is arranged in the protective sealing chamber (20112), and the pumping hole (20114) is communicated with the second through hole (2022).

6. The gas permeability tester according to claim 1, wherein a first annular groove (20110) for mounting the first sealing member (22) is formed on an outer peripheral side of the gas inlet hole (20113); a second annular groove (20111) for mounting the second seal (23) is provided on the outer peripheral side of the first annular groove (20110).

7. The gas transmittance tester according to claim 1, wherein the heat-insulating cover (203) comprises a cover body (2031), wherein an inner wall surface of the cover body (2031) is covered with a layer of heat-insulating layer (2032), or an outer wall of the cover body (2031) is covered with a layer of heat-insulating layer (2032).

8. The gas permeability tester of claim 1, wherein a temperature control unit is disposed on the test socket (201) and is configured to detect and regulate a temperature of the test socket (201).

9. The gas permeability tester of claim 8, wherein the temperature control unit comprises a temperature detection module for detecting a temperature inside the test chamber (21).

10. The gas permeability tester of claim 8, wherein the temperature control unit further comprises a temperature adjustment module (41), the temperature adjustment module (41) being configured to adjust the temperature within the test chamber (21).