High and low temperature gas transmittance tester

Abstract

The utility model discloses a high and low temperature gas transmittance tester which comprises a controller, a sensor box, a test box, a pressure sensor, a gas nozzle, a detection pipeline, a gas extraction pipeline, a first temperature sensor, a second temperature sensor, a first temperature controller and a second temperature controller, the test box is fixedly connected with the sensor box, a test cavity for placing a to-be-tested sample is arranged in the test box, an air tap connected with an external high-pressure air source is arranged on the test box, and the air tap is communicated with the test cavity; the pressure sensor is mounted in the sensor box, the test cavity is connected with the pressure sensor through the detection pipeline, and the test cavity is connected with an external vacuumizing system through the air exhaust pipeline. According to the utility model, the test precision of the differential pressure method gas transmission rate instrument in a high and low temperature test environment can be ensured, the high and low temperature environment of gas test can be ensured in a 5-95 DEG C test environment, and the test result is not influenced by the high and low temperature environment.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of barrier property detection, especially relates to a high and low temperature gas permeability tester. BACKGROUND

[0002] In the packaging material of food, medicine or medical instrument industry, in order to ensure its barrier property to gas, thereby prolonging the shelf life of product and keeping the quality of product, generally need to use pressure difference to test trace gas permeability. When trace gas permeability is tested by pressure difference method, high-precision pressure sensor needs to be used, and high-precision pressure sensor is extremely sensitive to environmental temperature, to realize high and low temperature test environment and high test precision, pressure sensor needs to have extremely stable environment, cannot be influenced by external high and low temperature, therefore, it is necessary to develop a kind of high and low temperature gas permeability tester with stable temperature environment. UTILITY MODEL CONTENT

[0003] The utility model discloses a kind of high and low temperature gas permeability tester, can improve the precision of test under high and low temperature test environment of differential pressure method gas permeability instrument.

[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows:

[0005] A kind of high and low temperature gas permeability tester, it includes controller, sensor box, test box, pressure sensor, gas nozzle, detection pipeline, suction pipeline, first temperature sensor, second temperature sensor, first temperature controller and second temperature controller;

[0006] The test box is fixedly connected with the sensor box, and the test box is internally provided with a test cavity for placing a sample to be tested. The test box is provided with a gas nozzle for connecting with an external high-pressure gas source. The gas nozzle is in communication with the test cavity. The first temperature controller is installed at the bottom of the test box, and the first temperature sensor is embedded in the interior of the test box.

[0007] The interior of the sensor box is provided with a mounting cavity, and the pressure sensor is installed in the mounting cavity. The test cavity is connected with the pressure sensor through the detection pipeline. The test cavity is connected with an external vacuum system through the suction pipeline. The second temperature controller is installed on the sensor box, and the second temperature controller is embedded in the interior of the sensor box.

[0008] The controller is electrically connected with the pressure sensor, the first temperature controller, the first temperature sensor, the second temperature controller and the second temperature sensor respectively. The first temperature controller is electrically connected with the first temperature sensor, and the second temperature controller is electrically connected with the second temperature sensor.

[0009] As a preferred scheme of the utility model, the test box includes upper test plate and lower test plate, the upper test plate is detachably covered and arranged above the lower test plate, the first temperature controller is installed at the bottom of the lower test plate, and the first temperature sensor is embedded in the inside of the lower test plate.

[0010] As a preferred scheme of the utility model, the air extraction pipeline is arranged in the inside of the installation cavity, and the bottom of the sensor box is provided with a through hole for the air extraction pipeline to pass out.

[0011] As a preferred scheme of the utility model, the air extraction pipeline is provided with a solenoid valve, and the solenoid valve is electrically connected with the controller.

[0012] As a preferred scheme of the utility model, the outside surface of the upper test plate is sequentially wrapped with a first temperature insulation layer and a heat preservation cover from inside to outside.

[0013] As a preferred scheme of the utility model, the outside surface of the lower test plate is wrapped with a second temperature insulation layer.

[0014] As a preferred scheme of the utility model, the lower test plate is further provided with a support plate for supporting the test box, the cross section of the lower test plate is T-shaped, and the support plate is provided with a stepped counterbore matched with the outside profile of the lower test plate.

[0015] As a preferred scheme of the utility model, the outside surface of the sensor box is sequentially provided with a temperature guide layer and a first heat insulation layer from inside to outside.

[0016] As a preferred scheme of the utility model, a connecting box is arranged between the test box and the sensor box, and the first temperature controller, the first temperature sensor, the detection pipeline and the air extraction pipeline are arranged in the inside of the connecting box.

[0017] As a preferred scheme of the utility model, the outside surface of the connecting box is wrapped with a second heat insulation layer.

[0018] The high-low temperature gas permeability tester provided by the utility model has the beneficial effects compared with the prior art, which are as follows:

[0019] During testing, the sample to be tested is placed in a test chamber. The chamber is then evacuated via an exhaust pipe and an external vacuum system. A pressure sensor detects changes in pressure within the chamber until the air inside the chamber is evacuated to a set vacuum state, at which point the external vacuum system stops pumping. High-pressure gas is then delivered into the chamber through a nozzle. The pressure sensor detects changes in pressure within the chamber as the high-pressure gas passes through the sample to be tested and feeds this pressure change back to a controller, which processes the data to obtain the gas permeability of the sample. During the testing process, a first temperature controller heats the test box and feeds back the temperature of the test box to the controller via a first temperature sensor, thereby maintaining the temperature within the test box within a relatively stable range. Simultaneously, a second temperature controller heats the sensor box and feeds back the temperature of the sensor box to the controller via the first temperature sensor, thereby maintaining the temperature within the sensor box within a relatively stable range. This improves the accuracy of the differential pressure gas permeability instrument under high and low temperature test environments. High and low temperature environments are maintained for gas testing under test conditions ranging from 5°C to 95°C, ensuring that test results are unaffected by these environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings of the embodiments are briefly introduced below.

[0021] Figure 1 This is a structural diagram of a high and low temperature gas permeability tester provided by an embodiment of the present utility model;

[0022] Figure 2 It is Figure 1 The structure shown is a schematic diagram of the structure under one viewing angle;

[0023] Figure 3 It is Figure 1 A schematic structural diagram of the structure shown in another viewing direction;

[0024] Figure 4 It is a schematic diagram of the internal structure of the sensor box.

[0025] Markings in the figure:

[0026] 1. Sensor box; 1a. Mounting cavity; 1b. Through hole; 2. Test box; 21. Test cavity; 21a. Upper test cavity; 21b. Lower test cavity; 22. Upper test plate; 23. Lower test plate; 3. Pressure sensor; 4. Air nozzle; 5. Detection pipe; 6. Exhaust pipe; 7. First temperature sensor; 8. Second temperature sensor; 9. First temperature controller; 10. Second temperature controller; 11. Solenoid valve; 12. First insulation layer; 13. Insulation cover; 14. Second insulation layer; 15. Support plate; 15a. Stepped countersunk hole; 16. Thermal conductive layer; 17. First insulation layer; 18. Connection box; 19. Second insulation layer; 20. Sample to be tested. DETAILED DESCRIPTION

[0027] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0029] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a high and low temperature gas permeability tester, which includes a controller, a sensor box 1, a test box 2, a pressure sensor 3, a gas nozzle 4, a detection pipe 5, an exhaust pipe 6, a first temperature sensor 7, a second temperature sensor 8, a first temperature controller 9 and a second temperature controller 10.

[0030] The test box 2 is fixedly connected to the sensor box 1. A test cavity 21 is provided inside the test box 2 for placing the sample 20 to be tested. The test box 2 is provided with a gas nozzle 4 for connecting to an external high-pressure gas source. The gas nozzle 4 is connected to the test cavity 21; the first temperature controller 9 is installed at the bottom of the test box 2, and the first temperature sensor 7 is embedded in the interior of the test box 2.

[0031] The sensor box 1 is internally provided with a mounting cavity 1a, the pressure sensor 3 is mounted in the mounting cavity 1a, the test cavity 21 is connected with the pressure sensor 3 through the detection pipeline 5, the test cavity 21 is connected with an external vacuum system through the air extraction pipeline 6, the second temperature controller 10 is mounted on the sensor box 1, and the second temperature controller 10 is embedded in the interior of the sensor box 1.

[0032] The controller is electrically connected with the pressure sensor 3, the first temperature controller 9, the first temperature sensor 7, the second temperature controller 10 and the second temperature sensor 8 respectively, the first temperature controller 9 is electrically connected with the first temperature sensor 7, and the second temperature controller 10 is electrically connected with the second temperature sensor 8. It should be noted that the controller is used for controlling the start and stop of the pressure sensor 3, the first temperature controller 9, the first temperature sensor 7, the second temperature controller 10 and the second temperature sensor 8, the first temperature controller 9 is used for maintaining the internal temperature of the test box 2, the first temperature sensor 7 is used for detecting the internal temperature of the test box 2, the second temperature controller 10 is used for maintaining the internal temperature of the sensor box 1, and the second temperature sensor 8 is used for detecting the internal temperature of the sensor box 1.

[0033] It should be noted that in the embodiment, the first temperature controller 9 is an existing device, which is internally provided with a heating module and a cooling module, so that the interior of the test box 2 can be heated or cooled, and the embodiment is not improved; the second temperature controller 10 is an existing device, which is internally provided with a heating module and a cooling module, so that the interior of the sensor box 1 can be heated or cooled, and the embodiment is not improved.

[0034] The high-low temperature gas permeability tester according to the utility model, when testing, the sample 20 to be tested is placed in the test cavity 21, so that the test cavity 21 forms an independent closed space, then the test cavity 21 is vacuumized through the air extraction pipeline 6 and the external vacuum extraction system, the pressure sensor 3 detects the pressure change value in the test cavity 21, until the air in the test cavity 21 is extracted to the set vacuum state, and the external vacuum extraction system stops air extraction; then high-pressure gas is delivered into the test cavity 21 through the air nozzle 4, the pressure sensor 3 detects the pressure change value of the test cavity 21 when the high-pressure gas permeates the sample 20 to be tested, and feeds back the pressure change value to the controller, and the controller obtains the gas permeability of the sample 20 to be tested after data processing. In the detection process, the first temperature controller 9 can heat the test box 2, and feed back the temperature in the test box 2 to the controller through the first temperature sensor 7, so that the temperature in the test box 2 is maintained in a relatively stable range; at the same time, the second temperature controller 10 can heat the sensor box 1, and feed back the temperature in the sensor box 1 to the controller through the first temperature sensor 7, so that the temperature in the sensor box 1 is maintained in a relatively stable range, thereby improving the precision of the differential pressure method gas permeability tester under high-low temperature test environment, ensuring the high-low temperature environment of gas testing under 5-95 degree test environment, and realizing that the test result is not affected by high-low temperature environment.

[0035] Exemplarily, in the present embodiment, the test box 2 comprises an upper test plate 22 and a lower test plate 23, the upper test plate 22 is detachably capped above the lower test plate 23, the first temperature controller 9 is installed at the bottom of the lower test plate 23, and the first temperature sensor 7 is embedded in the interior of the lower test plate 23; the test cavity 21 comprises an upper test cavity 21a and a lower test cavity 21b, the upper test cavity 21a is formed at the bottom of the upper test plate 22, and the lower test cavity 21b is formed at the top of the lower test plate 23; the air nozzle 4 is in communication with the upper test cavity 21a, the lower test cavity 21b is connected with the pressure sensor 3 through the detection pipeline 5, and the lower test cavity 21b is connected with the external vacuum system through the air extraction pipeline 6. The air extraction pipeline 6 is arranged in the interior of the installation cavity 1a, and the bottom of the sensor box 1 is provided with a through hole 1b through which the air extraction pipeline 6 passes. An electromagnetic valve 11 is arranged on the air extraction pipeline 6, the electromagnetic valve 11 is electrically connected with the controller, and the controller is used for controlling the opening and closing of the electromagnetic valve 11. During testing, the controller controls the electromagnetic valve 11 to open, the sample 20 to be tested is placed between the upper test plate 22 and the lower test plate 23, so that the upper test cavity 21a and the lower test cavity 21b form two mutually independent sealed spaces, the upper test cavity 21a and the lower test cavity 21b are vacuumized through the air extraction pipeline 6 and the external vacuum system, the pressure sensor 3 detects the pressure change value in the lower test cavity 21b, until the air in the test cavity 21 is extracted to a set vacuum state, the controller controls the electromagnetic valve 11 to close, and the external vacuum system stops air extraction; then high-pressure gas is transported into the upper test cavity 21a through the air nozzle 4, the high-pressure gas diffuses into the lower test cavity 21b from the upper test cavity 21a through the sample 20 to be tested, the pressure sensor 3 detects the pressure change value of the lower test cavity 21b when the high-pressure gas diffuses through the sample 20 to be tested, and feeds back the pressure change value to the controller, and the controller obtains the gas permeability of the sample 20 to be tested after data processing.

[0036] Exemplarily, the outer side surface of the upper test plate 22 is sequentially wrapped with a first temperature insulation layer 12 and a heat preservation cover 13 from inside to outside, and the outer side surface of the lower test plate 23 is wrapped with a second temperature insulation layer 14. Such design can avoid the rapid loss of heat in the test cavity 21, thereby improving the accuracy of the test result.

[0037] Exemplarily, the lower test plate 23 is further provided with a support plate 15 for supporting the test box 2, and the cross section of the lower test plate 23 is T-shaped, and the support plate 15 is provided with a stepped counterbore 15a matching the outer profile of the lower test plate 23. Therefore, the arrangement of the support plate 15 can improve the stability of the installation of the test box 2.

[0038] Exemplarily, the outer side surface of the sensor box 1 is sequentially provided with a temperature-conducting layer 16 and a first heat-insulating layer 17 from inside to outside. It should be noted that the temperature-conducting layer 16 is arranged to enable rapid temperature diffusion and ensure temperature distribution inside the installation cavity 1a when the sensor box 1 is heated by the second temperature controller 10; the first heat-insulating layer 17 is arranged to avoid scalding when a hand accidentally touches the surface of the sensor box 1 when the temperature of the sensor box 1 is too high.

[0039] Exemplarily, a connecting box 18 is arranged between the test box 2 and the sensor box 1, and the first temperature controller 9, the first temperature sensor 7, the detection pipeline 5 and the air extraction pipeline 6 are arranged inside the connecting box 18. Thus, the connecting box 18 can hide the first temperature controller 9, the first temperature sensor 7, the detection pipeline 5 and the air extraction pipeline 6, thereby improving the appearance of the device. Further, the outer side surface of the connecting box 18 is wrapped with a second heat-insulating layer 19, which can avoid scalding when a hand accidentally touches the surface of the connecting box 18.

[0040] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] The above is only the preferred embodiment of the present application, and it should be noted that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and substitutions can be made, which should also be considered as the protection scope of the present application.

Claims

1. A high and low temperature gas permeability tester, characterized in that: It includes a controller, a sensor box, a test box, a pressure sensor, a gas nozzle, a detection pipeline, an air extraction pipeline, a first temperature sensor, a second temperature sensor, a first temperature controller and a second temperature controller; The test box is fixedly connected to the sensor box. A test cavity is provided inside the test box for placing a sample to be tested. The test box is provided with a gas nozzle for connecting to an external high-pressure gas source, and the gas nozzle is in communication with the test cavity. The first temperature controller is installed at the bottom of the test box, and the first temperature sensor is embedded in the interior of the test box. The sensor box is provided with an installation cavity inside, the pressure sensor is installed in the installation cavity, the test cavity is connected to the pressure sensor via the detection pipe, the test cavity is connected to the external vacuum system via the exhaust pipe, and the second temperature controller is installed on the sensor box and embedded in the interior of the sensor box; The controller is electrically connected to the pressure sensor, the first thermostat, the first temperature sensor, the second thermostat and the second temperature sensor respectively. The first thermostat is electrically connected to the first temperature sensor, and the second thermostat is electrically connected to the second temperature sensor.

2. The high and low temperature gas permeability tester according to claim 1, characterized in that: The test box includes an upper test plate and a lower test plate, the upper test plate is detachably covered on top of the lower test plate, the first temperature controller is installed at the bottom of the lower test plate, and the first temperature sensor is embedded in the interior of the lower test plate; the test chamber includes an upper test chamber and a lower test chamber, the upper test chamber is formed at the bottom of the upper test plate, and the lower test chamber is formed at the top of the lower test plate; the gas nozzle is connected to the upper test chamber, the lower test chamber is connected to the pressure sensor through the detection pipe, and the lower test chamber is connected to the external vacuum system through the exhaust pipe.

3. The high and low temperature gas permeability tester according to claim 2, characterized in that: The air extraction pipeline is arranged inside the installation cavity, and a through hole is provided at the bottom of the sensor box for the air extraction pipeline to pass through.

4. The high and low temperature gas permeability tester according to claim 3, characterized in that: The air extraction pipeline is provided with a solenoid valve, and the solenoid valve is electrically connected to the controller.

5. The high and low temperature gas permeability tester according to claim 2, characterized in that: The outer surface of the upper test plate is wrapped with a first thermal insulation layer and a thermal insulation cover in sequence from the inside out.

6. The high and low temperature gas permeability tester according to claim 2, characterized in that: The outer surface of the lower test plate is wrapped with a second thermal insulation layer.

7. The high and low temperature gas permeability tester according to claim 3, characterized in that: The lower test plate is further provided with a support plate for supporting the test box. The cross section of the lower test plate is T-shaped, and the support plate is provided with a stepped countersunk hole matching the outer contour of the lower test plate.

8. The high and low temperature gas permeability tester according to claim 1, characterized in that: The outer surface of the sensor box is provided with a temperature conducting layer and a first heat insulating layer in sequence from the inside to the outside.

9. The high and low temperature gas permeability tester according to claim 3, characterized in that: A connection box is provided between the test box and the sensor box, and the first temperature controller, the first temperature sensor, the detection pipe and the air extraction pipe are all arranged inside the connection box.

10. The high and low temperature gas permeability tester according to claim 9, characterized in that: The outer surface of the connection box is wrapped with a second heat insulation layer.

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