CN111855535A - Side leakage prevention structure based on equal-pressure method gas transmission capacity test - Google Patents

Abstract

The invention discloses an equal-pressure-method-based side leakage prevention structure for gas permeability test, wherein a first gas groove and a second gas groove are respectively arranged on the opposite side surfaces of a first cavity and a second cavity, a first gas inlet channel and a first gas outlet channel which are communicated with the first gas groove are arranged on the first cavity, a second gas inlet channel and a second gas outlet channel which are communicated with the second gas groove are arranged on the second cavity, a first sealing element and a second sealing element are arranged between the first cavity and the second cavity, the first sealing element is sleeved outside the second sealing element, an annular cavity is enclosed between the first sealing element and the second sealing element, the second sealing element is sleeved outside the first gas groove and the second gas groove, and a gas extraction channel is arranged on the first cavity or the second cavity; or the first cavity is provided with a first fluid channel communicated with the annular cavity, and the first cavity or the second cavity is provided with a second fluid channel communicated with the annular cavity, so that the test error caused by the fact that air in the annular cavity enters the first cavity or the second cavity can be eliminated.

Description

Side leakage prevention structure based on equal-pressure method gas transmission capacity test

Technical Field

The invention relates to the technical field of test equipment, in particular to a side leakage prevention structure based on an equal-pressure method gas transmission capacity test.

Background

At present, the current industrial situation is that the barrier performance indexes of materials such as films, sheets and the like mainly comprise water vapor permeability and oxygen permeability, and the shelf life of a wrap is directly influenced by the barrier performance of the materials, so that the measurement accuracy requirement of the barrier performance indexes is higher and higher. The method for detecting the barrier property index set forth by the relevant national standard comprises the following steps: the general-rule detection method for the water vapor transmission amount of the packaging material comprises a cup-type method, an electrolytic sensor method, an infrared sensor method, a humidity sensor method and a sensor method of the last three, which are commonly called as an 'isobaric method'; secondly, the method for detecting the oxygen transmission capacity gauge comprises the following steps: differential pressure methods and coulometer methods, wherein coulometer methods are also commonly referred to as "isobaric methods".

The detection method standard of the water vapor transmission amount of materials such as films, sheets and the like comprises the following steps: GB/T21529-2008, ISO15106-3 (electrolytic sensor method); GB/T26253, ISO15106-2, ASTMF1249 (Infrared sensor method); ISO 15106-1, ASTME398 (humidity sensor method). The test principles required by the standard of three methods for detecting the water vapor transmission amount by the isobaric method can be summarized as follows: after the sample is clamped into the infiltration cavity, the infiltration cavity is divided into a dry cavity and a wet cavity or a carrier gas cavity and a sample gas cavity by the sample. The dry carrier gas flows through the dry cavity, the water vapor permeating the sample from the wet cavity is carried to an electrolytic sensor or an infrared sensor or a humidity sensor by the carrier gas, and the water vapor permeation quantity per unit area of the sample permeating per unit time is calculated by measuring the current value of electrolysis, namely an electrolytic sensor method, measuring the water vapor concentration in the carrier gas, namely an infrared sensor method, and measuring the humidity in the carrier gas, namely a humidity sensor method.

The oxygen transmission amount detection method of materials such as films and sheets is standard: ASTM D3985, ASTM F1307, ASTM F1927, GB/T19789, GB/T31354. Standard test principle of oxygen transmission amount detection method: the sample divides the gas-permeable chamber into two parts, one side of the sample is introduced with oxygen or air, the other side of the sample is introduced with high-purity nitrogen, the oxygen penetrating through the sample is carried by the nitrogen at the other side to enter the oxygen sensor for reaction to generate voltage, and the oxygen transmission amount penetrating through the sample in unit area in unit time is calculated by measuring the voltage value of the coulometer.

The relevant standards require a sealing means with the permeation chamber samples that are ubiquitous on the market: and (3) coating sealing grease on the binding surface of the carrier gas cavity and the sample, and clamping the sample by 1 sealing ring or 2 sealing rings arranged in the permeation cavity for sealing. In the sealing method, leakage in the thickness direction of the sample and the adhesion surface are unstable. When the water vapor transmission amount is tested, water molecules in the air or water molecules among 2 sealing rings leak to the carrier gas cavity through the thickness of the sample and the direction of the joint surface, are carried to the sensor by the carrier gas, and uncertain errors are introduced. For the oxygen transmission test, oxygen molecules in the air or oxygen molecules among 2 sealing rings leak to the carrier gas cavity through the thickness of the sample and the direction of the joint surface, are carried to the coulomb sensor by the carrier gas, and introduce uncertain errors.

Disclosure of Invention

Based on the above, the present invention provides a lateral leakage prevention structure based on the gas permeation amount test of the equal pressure method, which can reduce the test error, and overcome the defects of the prior art.

The technical scheme is as follows:

an anti-side leakage structure based on an isobaric method gas transmission test comprises a first cavity, a second cavity, a first sealing element and a second sealing element, wherein a first gas groove is formed in the side surface, close to the second cavity, of the first cavity, a first gas inlet channel and a first gas outlet channel which are communicated with the first gas groove are formed in the first cavity, a second gas groove which is arranged corresponding to the first gas groove is formed in the side surface, close to the first cavity, of the second cavity, a second gas inlet channel and a second gas outlet channel which are communicated with the second gas groove are formed in the second cavity, the first sealing element and the second sealing element are arranged between the first cavity and the second cavity, the first sealing element is sleeved outside the second sealing element, an annular cavity is formed between the first sealing element and the second sealing element, and the second sealing element is sleeved outside the first gas groove and the second gas groove, an air exhaust channel is arranged on the first cavity or the second cavity; or a first fluid channel communicated with the annular cavity is arranged on the first cavity, and a second fluid channel communicated with the annular cavity is arranged on the first cavity or the second cavity.

The side leakage prevention structure based on the gas transmission capacity test by the isobaric method can place a sample film to be tested between the first cavity and the second cavity, the first sealing element and the second sealing element can surround the first gas groove and the second gas groove, so that the first gas groove and the second gas groove are matched to form a closed space, the sample film can separate the closed space, wherein the sample film and the first air groove can enclose a first cavity, the sample film and the second air groove can enclose a second cavity, because the first cavity is provided with the first air inlet channel and the first air outlet channel which are communicated with the first cavity, the second cavity is provided with the second air inlet channel and the second air outlet channel which are communicated with the second cavity, sample gas and carrier gas can be respectively input into the first cavity and the second cavity through the first gas inlet channel and the second gas inlet channel, the transmission amount of the sample gas penetrating through the sample membrane is tested by using an equal pressure method, and air in the annular cavity is pumped out through the air pumping channel; or the first fluid channel and the second fluid channel are used for filling fluid into the annular cavity, so that the test error caused by the fact that air in the annular cavity enters the first cavity or the second cavity can be eliminated, the side leakage prevention structure based on the equal-pressure method gas transmission quantity test can prevent the test error from occurring, and more accurate test data can be obtained.

In one embodiment, the above-mentioned side leakage prevention structure based on the gas transmission capacity test by the isobaric method further includes a negative pressure pump, and when an air suction channel is provided on the first cavity or the second cavity, the negative pressure pump is communicated with the air suction channel.

In one embodiment, when a first fluid channel communicated with the annular cavity is arranged on the first cavity, and a second fluid channel communicated with the annular cavity is arranged on the first cavity or the second cavity, the first gas inlet channel is used for introducing carrier gas, and the first fluid channel is communicated with the first gas outlet channel.

In one embodiment, the structure for preventing side leakage based on the isobaric method gas transmission capacity test further comprises a sensor and a flow pipeline, wherein the flow pipeline is used for communicating the first fluid channel and the first gas outlet channel, and the sensor is arranged on the flow pipeline and used for detecting components in the flow pipeline.

In one embodiment, the above-mentioned side leakage prevention structure based on the isobaric method gas transmission amount test further includes a first protection valve and a second protection valve, the first protection valve and the second protection valve are both disposed on the flow pipeline, and the first protection valve and the second protection valve are respectively located at two ends of the sensor.

In one embodiment, when a first fluid channel communicated with the annular cavity is arranged on the first cavity, and a second fluid channel communicated with the annular cavity is arranged on the first cavity or the second cavity, an opening of the first fluid channel in the annular cavity and an opening of the second fluid channel in the annular cavity are respectively arranged at two sides of the annular cavity.

In one embodiment, the first cavity and the second cavity are both provided with insulating layers outside.

In one embodiment, the anti-side leakage structure based on the isobaric method gas transmission amount test further includes a temperature sensor, and a sensing end of the temperature sensor penetrates through the insulating layer and is arranged in the first cavity or the second cavity.

In one embodiment, the above-mentioned side leakage prevention structure based on the isobaric method gas transmission capacity test further includes a heat conduction positioning element, positioning grooves are correspondingly formed in the first cavity and the second cavity, and two ends of the heat conduction positioning element are respectively inserted into the two positioning grooves.

In one embodiment, the first cavity is provided with a mounting step structure matched with the second sealing element, and the second sealing element is used for abutting the sample film on the mounting step structure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and are not intended to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a first embodiment of a lateral leakage prevention structure based on an isobaric method gas transmission test according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is a second embodiment of a lateral leakage prevention structure based on an isobaric method gas transmission test according to the present invention;

FIG. 4 is a third embodiment of the structure for preventing side leakage according to the gas transmission capacity test of the isobaric method in the present invention;

fig. 5 is a cross-sectional view of fig. 3 and 4.

Description of reference numerals:

100. the first cavity, 101, a first air groove, 102, a first air inlet channel, 103, a first air outlet channel, 104, an air exhaust channel, 105, a first fluid channel, 106, a second fluid channel, 200, a second cavity, 201, a second air groove, 202, a second air inlet channel, 203, a second air outlet channel, 300, a first sealing element, 301, an annular cavity, 400, a second sealing element, 500, a negative pressure pump, 610, a first matching pipe, 620, a second matching pipe, 630, a third matching pipe, 640, a fourth matching pipe, 710, a sensor, 720, a first protection valve, 730, a second protection valve, 810, an insulating layer, 820, a temperature sensor, 830, a temperature control element, 840, a heat conduction positioning element, 910, a humidity sensor, 920, a third air inlet channel, 10, and a sample membrane.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

As shown in fig. 1 to 3, an embodiment discloses a side leakage prevention structure based on an isobaric method gas transmission test, which includes a first cavity 100, a second cavity 200, a first sealing element 300 and a second sealing element 400, wherein a first air groove 101 is disposed on a side surface of the first cavity 100 close to the second cavity 200, a first air inlet channel 102 and a first air outlet channel 103 communicated with the first air groove 101 are disposed on the first cavity 100, a second air groove 201 corresponding to the first air groove 101 is disposed on a side surface of the second cavity 200 close to the first cavity 100, a second air inlet channel 202 and a second air outlet channel 203 communicated with the second air groove 201 are disposed on the second cavity 200, the first sealing element 300 and the second sealing element 400 are disposed between the first cavity 100 and the second cavity 200, the first sealing element 300 is sleeved outside the second sealing element 400, and the first sealing element 300 and the second sealing element 400 are surrounded to form a circular cavity 301, the second sealing member 400 is sleeved outside the first air groove 101 and the second air groove 201, and the first cavity 100 or the second cavity 200 is provided with an air exhaust passage 104; or a first fluid channel 105 communicated with the annular cavity 301 is arranged on the first cavity 100, and a second fluid channel 106 communicated with the annular cavity 301 is arranged on the first cavity 100 or the second cavity 200.

The above-mentioned structure for preventing side leakage based on the equal-pressure method gas transmission capacity test can place the sample membrane 10 to be tested between the first cavity 100 and the second cavity 200, the first sealing element 300 and the second sealing element 400 can surround the first air groove 101 and the second air groove 201, so that the first air groove 101 and the second air groove 201 cooperate to form a closed space, the sample membrane 10 can separate the closed space, wherein the sample membrane 10 and the first air groove 101 can surround a first cavity, the sample membrane 10 and the second air groove 201 can surround a second cavity, because the first cavity 100 is provided with the first air inlet channel 102 and the first air outlet channel 103 communicated with the first cavity, the second cavity 200 is provided with the second air inlet channel 202 and the second air outlet channel 203 communicated with the second cavity, the first air inlet channel 102 and the second air inlet channel 202 can respectively input the sample gas and the carrier gas into the first cavity and the second cavity, the equal-pressure method is used to test the excessive transmission capacity of the sample membrane 10, while evacuating the air in the annular cavity 301 through the evacuation channel 104; or the first fluid channel 105 and the second fluid channel 106 are used for filling fluid into the annular cavity 301, so that the test error caused by the fact that the air in the annular cavity 301 enters the first cavity or the second cavity can be eliminated, and therefore the side leakage prevention structure based on the gas permeation quantity test by the isobaric method can prevent the test error from occurring, and more accurate test data can be obtained.

In this embodiment, the "sample gas" is a gas rich in the component of the sample film 10 to be blocked, for example, if the sample film 10 needs to be tested for the ability to block water vapor during the test, the "sample gas" may be water vapor adjusted with a certain humidity and flow rate, and if the sample film 10 needs to be tested for the ability to block oxygen during the test, the "sample gas" may be oxygen with a certain concentration and flow rate.

In this embodiment, the "carrier gas" is a gas used for collecting test data, and is generally a gas that does not contain a component that the sample film 10 needs to block, for example, if the sample film 10 needs to be tested for its ability to block water vapor during testing, the "carrier gas" may be a dry gas, and if the sample film 10 needs to be tested for its ability to block oxygen during testing, the "carrier gas" may be a gas that does not contain oxygen, and the blocking ability of the sample film 10 for the corresponding component can be known by measuring the component in the carrier gas after passing through the sample film 10. In addition, the carrier gas should not interfere with the normal operation of the test equipment such as the sensor 710, and should be chemically stable, such as inert gases like high purity nitrogen, helium, argon, etc.

Optionally, the above "sample gas and carrier gas can be respectively input into the first cavity and the second cavity through the first gas inlet channel 102 and the second gas inlet channel 202" means that different gases can be respectively input into the first cavity and the second cavity, for example, sample gas is input into the first cavity, and carrier gas is input into the second cavity; or the carrier gas is input into the second cavity, and then the sample gas is input into the first cavity.

Optionally, the above-mentioned "the first cavity 100 is provided with a first fluid channel 105 communicated with the annular cavity 301, and the first cavity 100 or the second cavity 200 is provided with a second fluid channel 106 communicated with the annular cavity 301", that is, the first fluid channel 105 and the second fluid channel 106 may be both provided on the first cavity 100; or the first fluid channel 105 is disposed on the first cavity 100, and the second fluid channel 106 is disposed on the second cavity 200, since the annular cavity 301 is actually surrounded by the first cavity 100, the first sealing member 300, the second cavity 200, and the second sealing member 400, no matter the first cavity 100 or the second cavity 200 is disposed with the fluid channel, the fluid can be introduced into the annular cavity 301.

Alternatively, the "isobaric method" is a method of testing the gas transmission amount of the sample membrane 10, and mainly tests the permeability of the corresponding component of the sample membrane 10 by passing different gases through both sides of the sample membrane 10, causing a concentration difference of a certain component of the two gases, and detecting the concentration difference of the component passing through the sample membrane 10 in a low concentration.

Optionally, the outermost edge of the sample membrane 10 when installed is located within the annular cavity 301 and does not cover the pumping channel 104 or the first and second fluid channels 105, 106. The fluid in the annular chamber 301 is prevented from leaking into the closed space.

In one embodiment, as shown in fig. 1 and 4, the above-mentioned structure for preventing side leakage based on the isobaric method gas transmission amount test further includes a negative pressure pump 500, and when the pumping channel 104 is disposed on the first cavity 100 or the second cavity 200, the negative pressure pump 500 is communicated with the pumping channel 104. The negative pressure pump 500 can be communicated with the air extraction channel 104, and is used for vacuumizing the annular cavity 301, reducing air in the annular cavity 301, preventing certain components in the air, such as water vapor or oxygen, from entering a closed space surrounded by the first air groove 101 and the second air groove 201 through leakage and influencing the test of the gas transmission amount of the sample membrane 10, and therefore, the interference can be eliminated, and a more accurate test result can be obtained.

In one embodiment, as shown in fig. 2 and 5, when the first cavity 100 is provided with a first fluid channel 105 communicated with the annular cavity 301, and the first cavity 100 or the second cavity 200 is provided with a second fluid channel 106 communicated with the annular cavity 301, the first gas inlet channel 102 is used for introducing carrier gas, and the first fluid channel 105 is communicated with the first gas outlet channel 103. When the first air inlet channel 102 is filled with carrier gas, the carrier gas passing through the sample membrane 10 flows out of the first air outlet channel 103, the first fluid channel 105 is communicated with the first air outlet channel 103, the carrier gas can be filled into the annular cavity 301 after passing through the sample membrane 10, the air in the original annular cavity 301 is discharged, at the moment, because the air pressures on two sides of the second sealing ring are the same, leakage is not easy to occur, and even if the air in the annular cavity 301 is leaked into the closed space, because the component of the gas leaked into the closed space is the same as that of the carrier gas passing through the sample membrane 10, the test of the gas filtration capacity of the sample membrane 10 cannot be influenced, the accuracy of a test structure can be ensured, extra fluid does not need to be filled into the first fluid channel 105 and the second fluid channel 106, and the test cost can be effectively reduced.

In other embodiments, as shown in fig. 3 and fig. 5, the first fluid channel 105 and the first air outlet channel 103 may not be connected, and the air in the annular cavity 301 may be discharged by introducing a fluid without a corresponding component into the first fluid channel 105 or the second fluid channel 106, so as to prevent the air in the annular cavity 301 from affecting the test of the sample membrane 10, where the "corresponding component" refers to a component of the filtration test of the sample membrane 10, such as water vapor, oxygen, and the like, and specifically, when the filtration test of the sample membrane 10 on water vapor is required, the fluid without the corresponding component may be a gas or a liquid with low water content and no corrosiveness; when the filtration capacity test of the test sample membrane 10 for oxygen is required, the fluid without the corresponding component may be a gas or a liquid which contains low oxygen and is not corrosive.

Optionally, as shown in fig. 2 and fig. 3, the above-mentioned lateral leakage prevention structure based on the isobaric method gas transmission capacity test further includes a first matching pipe 610, and the first matching pipe 610 is communicated with the first gas outlet channel 103.

Optionally, as shown in fig. 2 and fig. 3, the above-mentioned lateral leakage prevention structure based on the isobaric method gas transmission test further includes a second fitting pipe 620, and the second fitting pipe 620 is communicated with the first fluid channel 105.

Optionally, the first mating tube 610 is removably connected to the second mating tube 620. When the first fitting pipe 610 is communicated with the second fitting pipe 620, the carrier gas passing through the sample film 10 may be introduced into the annular chamber 301; when the first fitting pipe 610 and the second fitting pipe 620 are disassembled, the gas in the annular cavity 301 can be discharged in a mode of introducing other fluids into the first fluid channel 105, and the gas can be flexibly adjusted according to different testing requirements, so that the applicability is better.

In one embodiment, as shown in fig. 1 to 3, the structure for preventing side leakage based on an isobaric method gas permeation test further includes a sensor 710 and a flow channel, the flow channel is used for communicating the first fluid channel 105 and the first gas outlet channel 103, and the sensor 710 is disposed on the flow channel and is used for detecting components in the flow channel. The components in the flow channel can be measured by the sensor 710 for obtaining a test result of the gas permeation amount of the sample film 10, and the test is more accurate when the carrier gas has just passed through the sample film 10.

In other embodiments, sensor 710 may be used to measure only the composition of the gas exiting first gas outlet channel 103 if first fluid channel 105 is not in communication with first gas outlet channel 103.

Alternatively, the number of the sensors 710 may be one or at least two, the sensors 710 may be one or at least two of an electrolytic sensor, an infrared sensor, a humidity sensor, a coulomb sensor, and the like, and when the test sample is tested for water vapor transmission amount, the electrolytic sensor, the infrared sensor, the humidity sensor may be used for measurement; when the oxygen transmission of the test sample is measured, it can be measured using a coulomb sensor. If the number of the sensors 710 is at least two, different sensors 710 may be of the same type, and are used for averaging after multiple measurements, so as to reduce measurement errors; or different sensors 710 can be of different types, different sensors 710 can be started when different gas transmission amount tests are carried out, disassembly and assembly are reduced, use is convenient, and adaptability is good.

Optionally, the first fitting tube 610 and the second fitting tube 620 may be fitted to form the flow channel, and the first fitting tube 610 and the second fitting tube 620 are detachably connected to two ends of the sensor 710, respectively, so that the sensor 710 may be replaced or repaired.

In one embodiment, as shown in fig. 1 to 3, the structure for preventing side leakage based on the isobaric gas permeation test further includes a first protection valve 720 and a second protection valve 730, the first protection valve 720 and the second protection valve 730 are both disposed on the flow pipe, and the first protection valve 720 and the second protection valve 730 are respectively located at two ends of the sensor 710. When the sensor 710 needs to be replaced and repaired, the first protection valve 720 and the second protection valve 730 can be closed, so that the operation is convenient.

Optionally, as shown in fig. 1 to fig. 3, the above-mentioned side leakage prevention structure based on the isobaric method gas transmission amount test further includes a third matching tube 630 and a fourth matching tube 640, the first protection valve 720 is a three-way structure, three passages of the first protection valve 720 are respectively communicated with the first matching tube 610, the third matching tube 630 and the fourth matching tube 640, the first protection valve 720 is communicated with the sensor 710 through the third matching tube 630, and the carrier gas flowing out of the first gas outlet channel 103 can pass through the sensor 710 and enter the first fluid channel 105 by using the first protection valve 720, or be directly discharged from the fourth matching tube 640.

Optionally, the third mating tube 630 and the second mating tube 620 are both removably connected to the sensor 710.

In one embodiment, as shown in fig. 5, when the first cavity 100 is provided with a first fluid channel 105 communicating with the annular cavity 301, and the first cavity 100 or the second cavity 200 is provided with a second fluid channel 106 communicating with the annular cavity 301, an opening of the first fluid channel 105 in the annular cavity 301 and an opening of the second fluid channel 106 in the annular cavity 301 are respectively provided at two side positions in the annular cavity 301. At this time, after the fluid enters the annular cavity 301, the fluid needs to flow through more space to be discharged, so that the space in the annular cavity 301 can be fully filled, and the air in the annular cavity 301 can be discharged as much as possible, thereby further reducing the test error.

Alternatively, the number of the first fluid channels 105 and the second fluid channels 106 may be at least two, and by increasing the number of the first fluid channels 105 and the second fluid channels 106, the annular cavity 301 can be filled more quickly, and the air in the annular cavity 301 can be discharged as much as possible.

In one embodiment, as shown in fig. 1 to 3, an insulating layer 810 is disposed outside each of the first chamber 100 and the second chamber 200. The insulating layer 810 can reduce the temperature variation of the first cavity 100 and the second cavity 200, and prevent the temperature variation from affecting the test result.

In one embodiment, as shown in fig. 1 to 3, the structure for preventing side leakage based on the isobaric method gas transmission amount test further includes a temperature sensor 820, and a sensing end of the temperature sensor 820 penetrates through the insulating layer 810 and is disposed in the first cavity 100 or the second cavity 200. At this time, the temperature sensor 820 can extend into the first chamber 100 or the second chamber 200 to more accurately know the internal temperature, so that the temperature can meet the test requirement.

Optionally, as shown in fig. 1 to fig. 3, the above-mentioned side leakage prevention structure based on the isobaric method gas transmission amount test further includes a temperature control element 830, and the temperature control element 830 is used for attaching the first cavity 100 and/or the second cavity 200, and can adjust the temperature of the first cavity 100 or the second cavity 200 to meet the test requirement.

In one embodiment, as shown in fig. 1 to 3, the above-mentioned structure for preventing side leakage based on the isobaric method gas transmission amount test further includes a heat conducting positioning element 840, positioning grooves are correspondingly formed on the first cavity 100 and the second cavity 200, and two ends of the heat conducting positioning element 840 are respectively inserted into the two positioning grooves. The heat conducting positioning member 840 can have the positioning and heat conducting functions at the same time, the heat conducting positioning member 840 is inserted into the two positioning grooves respectively, the first cavity 100 and the second cavity 200 can be aligned, and the heat conducting positioning member 840 can realize the heat transfer between the first cavity 100 and the second cavity 200, so that the temperatures of the first cavity 100 and the second cavity 200 are the same or similar, and the test error is reduced.

Alternatively, the heat conductive positioning member 840 may be a metal member. Such as copper, stainless steel, etc. Has high strength, good thermal conductivity and difficult rusting.

In one embodiment, the first chamber 100 is provided with a mounting step structure matching with the second sealing member 400, and the second sealing member 400 is used for abutting the sample film 10 on the mounting step structure. The sample membrane 10 can be tightly pressed through the installation step structure, the fit between the sample membrane 10 and the first sealing element 300 and the first cavity 100 is tighter, fluid in the annular cavity 301 can be prevented from leaking into the annular cavity 301 from the gap between the sample membrane 10 and the first sealing element 300 or the first cavity 100, and the test error is reduced.

Optionally, the mounting step structure is arranged at the edge of the first cavity 100 close to the first air groove 101, the mounting step structure is a notch structure formed at the edge of the first cavity 100 close to the first air groove 101, and at this time, the sample film 10 and the inner wall structure of the notch structure bend the edge of the sample film 10, so that leakage is more difficult to occur; or the first cavity 100 is provided with an annular groove for installing the second sealing element 400, and two sides of the annular groove form the installation step structure, so that the sample film 10 can be bent to a certain extent and is not easy to leak; or the first cavity 100 is provided with a protrusion arranged around the first air groove 101, the end face of the protrusion is provided with a groove for mounting the second sealing ring, the protrusion is the mounting step structure, and the sample film 10 can be bent to a certain extent and is not easy to leak.

Optionally, a groove body for installing the first sealing element 300 is further arranged on the first cavity 100, and the groove body is arranged around the first air groove 101, so that the first sealing element 300 is convenient to install and position, and the sealing effect can be improved.

Optionally, the above-mentioned lateral leakage prevention structure based on the gas transmission capacity test by the isobaric method further includes a humidity sensor 910, and a sensing end of the humidity sensor 910 is used for sensing humidity in the second air intake channel 202. Specifically, a third air inlet channel 920 communicated with the second air inlet channel 202 is arranged in the first cavity 100, and a sensing end of the humidity sensor 910 extends into the third air inlet channel 920. The humidity of the sample gas can be better detected.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Claims (10)

1. A side leakage prevention structure based on an isobaric method gas transmission test is characterized by comprising a first cavity, a second cavity, a first sealing element and a second sealing element, wherein a first gas groove is formed in the side face, close to the second cavity, of the first cavity, a first gas inlet channel and a first gas outlet channel which are communicated with the first gas groove are formed in the first cavity, a second gas groove which is corresponding to the first gas groove is formed in the side face, close to the first cavity, of the second cavity, a second gas inlet channel and a second gas outlet channel which are communicated with the second gas groove are formed in the second cavity, the first sealing element and the second sealing element are arranged between the first cavity and the second cavity, the first sealing element is sleeved outside the second sealing element, an annular cavity is formed between the first sealing element and the second sealing element, and the second sealing element is sleeved outside the first gas groove and the second gas groove, an air exhaust channel is arranged on the first cavity or the second cavity; or a first fluid channel communicated with the annular cavity is arranged on the first cavity, and a second fluid channel communicated with the annular cavity is arranged on the first cavity or the second cavity.

2. The structure of claim 1, further comprising a negative pressure pump, wherein when the first cavity or the second cavity is provided with an air pumping channel, the negative pressure pump is communicated with the air pumping channel.

3. The structure of claim 1, wherein when a first fluid channel is disposed on the first cavity and a second fluid channel is disposed on the first cavity or the second cavity, the first fluid channel is used for introducing carrier gas, and the first fluid channel is communicated with the first gas outlet channel.

4. The structure of claim 3, further comprising a sensor and a flow channel for connecting the first fluid channel and the first gas outlet channel, wherein the sensor is disposed on the flow channel for detecting components in the flow channel.

5. The structure of claim 4, further comprising a first protection valve and a second protection valve, wherein the first protection valve and the second protection valve are both disposed on the flow pipe, and the first protection valve and the second protection valve are respectively disposed at two ends of the sensor.

6. The structure of claim 1, wherein when the first cavity has a first fluid channel connected to the annular cavity and the first cavity or the second cavity has a second fluid channel connected to the annular cavity, the openings of the first fluid channel and the second fluid channel are respectively disposed at two sides of the annular cavity.

7. The structure of claim 1, wherein the first and second cavities are externally provided with an insulating layer.

8. The structure of claim 7, further comprising a temperature sensor, wherein a sensing end of the temperature sensor penetrates through the insulating layer and is disposed in the first cavity or the second cavity.

9. The structure of any one of claims 1 to 8, further comprising a heat conduction positioning element, wherein the first cavity and the second cavity are respectively provided with a positioning groove, and two ends of the heat conduction positioning element are respectively inserted into the two positioning grooves.

10. The structure of any one of claims 1 to 8, wherein the first cavity has a mounting step structure matching with the second sealing member, and the second sealing member is used for abutting the sample membrane against the mounting step structure.

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