Air permeability tester

Abstract

The utility model relates to the technical field of instruments and meters, in particular to an air permeability tester which adopts a differential pressure comparison method, is higher in accuracy and short in testing time, and solves the problems of poor repeatability and overlong testing time in testing. Comprising a gas source; the pressure reducing valve is installed on the air source, the precise pressure reducing valve is installed on the pressure reducing valve, the proportional valve is installed on the precise pressure reducing valve, the air storage tank is installed on the proportional valve, the nozzle is installed on the air storage tank, and the electromagnetic valves are installed on the two sets of pressure transmitters. The two sets of electromagnetic valves are installed on the pressure reducing valve and the nozzle respectively, the testing cavity is installed on one set of electromagnetic valves, the two sets of pressure transmitters are connected with the testing cavity and the air storage tank respectively, and the testing cavity air cylinder is connected with the other set of electromagnetic valves.

Description

Technical Field

[0001] The utility model relates to the technical field of instruments and meters, in particular to an air permeability tester. Background Art

[0002] An air permeability tester is a precision instrument used to measure the air permeability of materials.

[0003] In the existing air permeability testers, for example, an air permeability tester disclosed in the utility model patent with the application number 200720187615.5, this utility model converts physical quantities such as the gas flow rate passing through the specimen, the gas pressure difference between both ends of the specimen, the local atmospheric pressure, and the correction coefficient for removing water vapor collected by a flow sensor, a pressure sensor, etc. into electronic signals, which are concentrated in an electronic signal acquisition and processing device, and can be displayed, automatically calculated, and automatically printed, with convenient and straightforward operation.

[0004] However, during the use of the air permeability tester, the commonly used method at present is the constant pressure direct flow measurement method, which has a long test time, a complex instrument structure, and is not convenient for quickly completing the test. Summary of the Utility Model

[0005] To solve the above technical problems, the present utility model provides an air permeability tester that uses the differential pressure comparison method, has higher accuracy, a fast test time, and solves the problems of poor repeatability and too long determination time in the test.

[0006] An air permeability tester of the present utility model includes an air source; it also includes a pressure reducing valve, a precision pressure reducing valve, a proportional valve, an air storage tank, a nozzle, two groups of solenoid valves, a test chamber, two groups of pressure transmitters, and a test chamber cylinder. The pressure reducing valve is installed on the air source, the precision pressure reducing valve is installed on the pressure reducing valve, the proportional valve is installed on the precision pressure reducing valve, the air storage tank is installed on the proportional valve, the nozzle is installed on the air storage tank, the two groups of solenoid valves are respectively installed on the pressure reducing valve and the nozzle, the test chamber is installed on one group of solenoid valves, the two groups of pressure transmitters are respectively connected to the test chamber and the air storage tank, and the test chamber cylinder is connected to the other group of solenoid valves; in a determined temperature and humidity environment, the air pressure in the air storage tank at the front end of the nozzle is fixed, and the pressure in the test chamber after rapid stabilization is measured. Through the comparison of the relevant pressures on both sides and in combination with the relevant diameter of the nozzle, the air permeability of the specimen is obtained. The air storage tank pressure is fixed, the specimen is clamped by the test chamber cylinder, and after the pressure in the test chamber is stable, the air permeability of the specimen is directly read out by internal system calculation. This device uses the differential pressure comparison method, has higher accuracy, a fast test time, and solves the problems of poor repeatability and too long determination time in the test.

[0007] Preferably, the air source provides the detection air pressure; the air pressure for the device is provided by the air source.

[0008] Preferably, the input end of the pressure reducing valve is connected to the output end of the gas source; the flow rate and pressure of the fluid are adjusted by the pressure reducing valve to reduce the inlet pressure to a required outlet pressure, and the outlet pressure is automatically kept stable by relying on the energy of the medium itself.

[0009] Preferably, the input end of the precision pressure reducing valve is connected to the output end of the pressure reducing valve; the precision pressure reducing valve is a key component for reducing high-pressure gas to a specific pressure range to meet the requirements of system operation and equipment safety.

[0010] Preferably, the input end of the proportional valve is connected to the output end of the precision pressure reducing valve; the proportional valve converts the input electrical signal into force or displacement in proportion, thereby continuously controlling parameters such as pressure and flow rate, and it is a hydraulic valve.

[0011] Preferably, the input end of the gas storage tank is connected to the output end of the proportional valve; the gas storage tank is used to store gas, and its main function, in addition to storing gas, also plays a role in stabilizing the system pressure.

[0012] Preferably, the input end of the nozzle is connected to the output end of the gas storage tank; the nozzle is a key industrial equipment component used to form a flowing device by passing gas or liquid through the nozzle holes.

[0013] Preferably, the input ends of two groups of solenoid valves are respectively connected to the output end of the pressure reducing valve and the output end of the nozzle; the solenoid valve is an industrial equipment controlled by electromagnetic force. As a basic automation component for controlling fluids, it belongs to one type of actuator and is not limited to hydraulic and pneumatic systems.

[0014] Preferably, the input end of the test chamber is connected to the output end of one group of solenoid valves, and the input ends of two groups of pressure transmitters are respectively connected to the output end of the gas storage tank and the output end of the test chamber; the pressure transmitter is a sensor widely used in industrial practice, and its main function is to convert physical pressure parameters such as gas and liquid into standard electrical signals for easy measurement, indication, and process adjustment.

[0015] Preferably, the input end of the test chamber cylinder is connected to the output end of the other group of solenoid valves; the test chamber cylinder is a cylinder used in a specific test environment, and it is mainly used to control the air pressure in the test chamber, push or pull test pieces, etc.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows: in a determined temperature and humidity environment, the air pressure in the gas storage tank at the front end of the fixed nozzle is fixed, and the pressure after rapid stabilization in the test chamber is measured. By comparing the relevant pressures on both sides and combining the relevant diameter of the nozzle, the air permeability of the specimen is obtained. With the gas storage tank pressure fixed, the specimen is compressed by the test chamber cylinder. After the pressure in the test chamber is stabilized, the air permeability of the specimen is directly read out by the internal system calculation. This device uses the differential pressure comparison method, with higher accuracy and faster test time, solving the problems of poor repeatability and too long determination time in the test. Brief Description of the Drawings

[0017] Figure 1 is the first axonometric structural schematic diagram of the present utility model;

[0018] Figure 2 is the second axonometric structural schematic diagram of the present utility model;

[0019] Figure 3 is the right-view sectional axonometric structural schematic diagram of the present utility model;

[0020] Figure 4 is the nozzle of the present utility model in Figure 3 the enlarged right-view sectional axonometric structural schematic diagram of part A;

[0021] Reference numerals in the drawings: 1, gas source; 2, pressure reducing valve; 3, precision pressure reducing valve; 4, proportional valve; 5, gas storage tank; 6, nozzle; 7, solenoid valve; 8, test chamber; 9, pressure transmitter; 10, test chamber cylinder. Detailed Description of the Preferred Embodiments

[0022] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive. Embodiment 1

[0023] As Figures 1 to 4 shown, an air permeability tester includes a gas source 1, and also includes a pressure reducing valve 2, a precision pressure reducing valve 3, a proportional valve 4, a gas storage tank 5, a nozzle 6, two groups of solenoid valves 7, a test chamber 8, two groups of pressure transmitters 9 and a test chamber cylinder 10. The pressure reducing valve 2 is installed on the gas source 1, the precision pressure reducing valve 3 is installed on the pressure reducing valve 2, the proportional valve 4 is installed on the precision pressure reducing valve 3, the gas storage tank 5 is installed on the proportional valve 4, the nozzle 6 is installed on the gas storage tank 5, the two groups of solenoid valves 7 are respectively installed on the pressure reducing valve 2 and the nozzle 6, the test chamber 8 is installed on one group of solenoid valves 7, the two groups of pressure transmitters 9 are respectively connected to the test chamber 8 and the gas storage tank 5, and the test chamber cylinder 10 is connected to the other group of solenoid valves 7;

[0024] The air source 1 provides the detection air pressure;

[0025] The input end of the pressure reducing valve 2 is connected to the output end of the air source 1;

[0026] The input end of the precision pressure reducing valve 3 is connected to the output end of the pressure reducing valve 2;

[0027] The input end of the proportional valve 4 is connected to the output end of the precision pressure reducing valve 3;

[0028] The input end of the gas storage tank 5 is connected to the output end of the proportional valve 4;

[0029] The input end of the nozzle 6 is connected to the output end of the gas storage tank 5;

[0030] The input ends of two groups of solenoid valves 7 are respectively connected to the output end of the pressure reducing valve 2 and the output end of the nozzle 6;

[0031] The input end of the test chamber 8 is connected to the output end of one group of solenoid valves 7, and the input ends of two pressure transmitters 9 are respectively connected to the output end of the gas storage tank 5 and the output end of the test chamber 8;

[0032] The input end of the test chamber cylinder 10 is connected to the output end of the other group of solenoid valves 7;

[0033] Under the determined temperature and humidity environment, the air pressure in the gas storage tank 5 in front of the nozzle 6 is fixed, and the pressure in the test chamber 8 after rapid stabilization is measured. Through the relevant comparison of the pressures on both sides and in combination with the relevant diameter of the nozzle 6, the air permeability of the specimen is obtained. The pressure of the gas storage tank 5 is fixed, the specimen is pressed by the test chamber cylinder 10, and after the pressure in the test chamber 8 is stable, the air permeability of the specimen is directly read out by the internal system calculation. This device uses the differential pressure comparison method, with higher accuracy and faster test time, solving the problems of poor repeatability and too long determination time in the test.

[0034] As Figures 1 to 4 shown, for a air permeability tester of the present utility model, when it works, under the determined temperature and humidity environment, the air pressure in the gas storage tank 5 in front of the nozzle 6 is fixed, and the pressure in the test chamber 8 after rapid stabilization is measured. Through the relevant comparison of the pressures on both sides and in combination with the relevant diameter of the nozzle 6, the air permeability of the specimen is obtained. The pressure of the gas storage tank 5 is fixed, the specimen is pressed by the test chamber cylinder 10, and after the pressure in the test chamber 8 is stable, the air permeability of the specimen is directly read out by the internal system calculation.

[0035] The main functions achieved by the present utility model are: during the working process of the instrument, this device uses the differential pressure comparison method, with higher accuracy and faster test time, solving the problems of poor repeatability and too long determination time in the test.

[0036] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. An air permeability tester, comprising an air source (1); characterized in that, It also includes a pressure reducing valve (2), a precision pressure reducing valve (3), a proportional valve (4), an air storage tank (5), a nozzle (6), two groups of solenoid valves (7), a test chamber (8), two groups of pressure transmitters (9) and a test chamber cylinder (10). The pressure reducing valve (2) is installed on the air source (1), the precision pressure reducing valve (3) is installed on the pressure reducing valve (2), the proportional valve (4) is installed on the precision pressure reducing valve (3), the air storage tank (5) is installed on the proportional valve (4), the nozzle (6) is installed on the air storage tank (5), the two groups of solenoid valves (7) are respectively installed on the pressure reducing valve (2) and the nozzle (6), the test chamber (8) is installed on one group of solenoid valves (7), the two groups of pressure transmitters (9) are respectively connected to the test chamber (8) and the air storage tank (5), and the test chamber cylinder (10) is connected to the other group of solenoid valves (7).

2. The air permeability tester according to claim 1, wherein The air source (1) provides the detection air pressure.

3. The air permeability tester according to claim 2, wherein, The input end of the pressure reducing valve (2) is connected to the output end of the air source (1).

4. The air permeability tester according to claim 3, characterized in that, The input end of the precision pressure reducing valve (3) is connected to the output end of the pressure reducing valve (2).

5. The air permeability tester according to claim 4, characterized in that, The input end of the proportional valve (4) is connected to the output end of the precision pressure reducing valve (3).

6. The air permeability tester according to claim 5, characterized in that, The input end of the air storage tank (5) is connected to the output end of the proportional valve (4).

7. The air permeability tester according to claim 6, characterized in that, The input end of the nozzle (6) is connected to the output end of the air storage tank (5).

8. The air permeability tester according to claim 7, wherein, The input ends of the two groups of solenoid valves (7) are respectively connected to the output end of the pressure reducing valve (2) and the output end of the nozzle (6).

9. The air permeability tester according to claim 8, characterized in that, The input end of the test chamber (8) is connected to the output end of one group of solenoid valves (7), and the input ends of the two groups of pressure transmitters (9) are respectively connected to the output end of the air storage tank (5) and the output end of the test chamber (8).

10. Test chamber cylinder (10). The air permeability tester according to claim 9, characterized in that, The input end of the test chamber cylinder (10) is connected to the output end of the other group of solenoid valves (7).

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