CN201138321Y - Air permeability tester - Google Patents

Abstract

The utility model discloses an air permeability tester, it includes by air supply (1), the pressure reducer, gas flow measurement meter (5a) (5b) (5c) sample holder (7) and gas pressure gauge (8a) (8b), air supply (1) is passed through the pressure reducer and is connected with gas flow measurement meter, gas flow measurement meter and sample holder (7) are connected, sample holder (7) and gas pressure gauge are connected, gas flow measurement meter and gas pressure gauge set up to exportable electronic signal's sensor, gas flow measurement meter and gas pressure gauge are connected with the electronic signal acquisition processing apparatus who is used for showing, automatic calculation and automatic printing. The utility model discloses a physical quantity such as the gas flow through the sample that flow sensor, pressure sensor etc. will gather, the gas pressure difference of sample both ends face, local atmospheric pressure, the correction coefficient who gets rid of steam converts into electronic signal, concentrates on in electronic signal acquisition and processing device 9, can show, automatic calculation and automatic printing, and the simple operation is straightforward.

Description

A gas permeability tester

technical field

The utility model relates to an air permeability tester for refractory products, in particular a sensor capable of outputting electrical signals is adopted, thereby realizing automatic measurement and control of the instrument.

Background technique

The air permeability of refractory products is the performance of materials that allow gas to pass through under pressure difference.

The international standard "ISO 8841:1991 Dense Shaped Refractory Products - Determination of Air Permeability" gives the structure of the air permeability tester: it consists of a gas source, a gas flow meter, a sample holder, a liquid pressure gauge, and a vernier caliper. The gas flow meter of this air permeability tester "consists of a sensitive rotameter calibrated at a given line temperature and Calibration, and should only be used to measure the middle part of the scale"; in the test procedure, the test temperature, gas dynamic viscosity, sample height, cross-sectional area of the gas passing through the sample, pressure difference between the two ends of the sample, passing through the sample The gas flow rate, local atmospheric pressure, correction coefficient for removing water vapor and other data are all obtained by manual reading or table lookup, and then the operator manually calculates the measurement results.

my country's national standard "GB/T3000-1999 Test Method for Air Permeability of Dense Shaped Refractory Products" is equivalent to the international standard "ISO 8841:1991", and the structure of the tester is the same.

The American National Standard "ASTM C 577-1999 Test Method for Air Permeability of Refractory Materials" gives the structure of the test equipment, which is basically the same as the international standard test equipment, except that the sample is a regular cube.

Defects of the prior art: (1) the gas flow meters in the three standard measuring devices are composed of a group of rotameters, and the measurement accuracy of the rotameters is generally not high, and the precision of the rotameters made in China is 2.5 Level, that is, the accuracy is 2.5%, especially the flowmeter for measuring small flow (measurement range below 1000ml/min), the measurement accuracy can only reach 4%, which is not up to the standard "the flowmeter should be accurate to within 2% "stipulations, so it is also stipulated that "the gas used should be calibrated regularly, and only the middle part of the measurement scale should be used"; (2) All data in the test process are obtained by manual reading or table lookup, and then the operator The measurement results are obtained by manual calculation, the test data has large errors, the calculation is cumbersome, and automatic measurement and control cannot be implemented.

Contents of the invention

The purpose of the utility model is to provide an air permeability tester to overcome the defects of the existing air permeability tester such as low precision, complicated operation and cumbersome manual calculation.

The purpose of this utility model can be achieved by the following technical solutions: a gas permeability tester, which includes a gas source, a pressure reducer, a gas flow meter sample holder and a gas pressure gauge, and the gas source passes through the pressure reducer It is connected with the gas flow meter, the gas flow meter is connected with the sample holder, and the sample holder is connected with the gas pressure gauge, and the characteristic is that the gas flow meter and the gas pressure gauge are set as sensors capable of outputting electronic signals , the gas flow meter and the gas pressure gauge are connected with an electronic signal acquisition and processing device for display, automatic calculation and automatic printing.

The gas flow meter is set as a flow sensor capable of converting the gas flow into an electrical signal, which can be a mass flow meter or a mass flow controller.

The gas pressure gauge is set as a pressure sensor capable of converting gas pressure into an electrical signal, and the pressure sensor is a pressure transmitter.

The utility model has the advantages: (1) The measurement of the gas flow adopts the flow sensor which can output the electronic signal instead of the rotameter, and the signal is sent to the electronic signal acquisition and processing device. The measurement accuracy of the flow sensor is higher than that of the rotameter, which not only improves The accuracy of the measurement results is improved, and automatic measurement and control can be realized. (2) Gas pressure measurement uses a pressure sensor that can output electronic signals to replace the U-shaped liquid pressure gauge, and the signal is sent to the electronic signal acquisition and processing device. The pressure sensor is used to improve the pressure test range and expand the range of the instrument.

The utility model converts physical quantities such as the collected gas flow through the sample, the gas pressure difference between the two ends of the sample, the local atmospheric pressure, and the correction coefficient for removing water vapor into electronic signals through flow sensors, pressure sensors, etc., and focuses on the electronic signals. In the collection and processing device 9, display, automatic calculation and automatic printing are possible, and the operation is convenient and straightforward.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the air permeability tester measurement system.

In the figure 1, gas source, 2, special gas pressure reducer, 3a, 3b gas filter pressure reducer, 4, gas precision voltage regulator, 5a, 5b, 5c, gas flow meter, 6a, 6b, 6c, 6d Stop valve, 7. Sample holder, 8a, 8b gas pressure gauge, 9. Electronic signal acquisition and processing device,

Detailed ways

In conjunction with the accompanying drawings, the specific embodiments of the utility model are described.

As shown in accompanying drawing 1: it includes a gas source 1, a pressure reducer, a gas flow meter, a sample holder 7, and gas pressure gauges 8a, 8b, shut-off valves 6a, 6b, 6c, 6d, electronic signal acquisition and processing Device 9, gas source 1 uses liquefied nitrogen (or compressed air) bottle, gas source 1 is connected with gas flow meter through pressure reducer, gas flow meter is connected with sample holder 7, sample holder 7 and The gas pressure gauge 8a is connected, the gas pressure gauge 8b communicates with the atmosphere, and the standard electronic signals output by the gas flow meter 5a, 5b, 5c and the gas pressure gauge 8a, 8b are sent to the electronic signal acquisition and processing device 9; the pressure reducer is composed of a gas The special pressure reducer 2 and two gas filter pressure reducers 3a, 3b are formed. The gas flow meter adopts a mass flow meter (also called an electronic flow meter) or a mass flow controller, which is a flow sensor that can output standard electronic signals. This embodiment adopts a mass flowmeter, which is composed of three groups of mass flowmeters, which are used as a device for measuring the flow rate of gas passing through the sample; gas pressure gauges 8a, 8b use pressure transmitters, which are pressure sensors that can output standard electronic signals , as a sensor for measuring the gas pressure difference between the two ends of the sample and measuring the local atmospheric pressure.

The utility model uses the flow sensor (mass flow meter or mass flow controller), the pressure sensor (pressure transmitter) and the like to collect the gas flow through the sample, the gas pressure difference between the two ends of the sample, the local atmospheric pressure, and remove The physical quantities such as the correction coefficient of water vapor are converted into standard electronic signals, which are concentrated in the electronic signal acquisition and processing device 9 (existing commercially available products can be used), which can be displayed, automatically calculated and automatically printed.

Claims (6)

1. An air permeability tester comprising a gas source (1), a pressure reducer, a gas flow meter (5a) (5b) (5c) a sample holder (7) and a gas pressure gauge (8a) (8b), the gas source (1) is connected to the gas flow meter through a pressure reducer, the gas flow meter is connected to the sample holder (7), the sample holder (7) is connected to the gas pressure gauge, and The feature is that the gas flow meter and the gas pressure meter are set as sensors capable of outputting electronic signals, and the gas flow meter and the gas pressure meter are connected with an electronic signal acquisition and processing device (9) for display, automatic calculation and automatic printing. 2. A gas permeability tester according to claim 1, characterized in that: the gas flow meter is set as a flow sensor capable of converting the gas flow into an electrical signal. 3. A gas permeability tester according to claim 1, characterized in that: the gas pressure gauge is set as a pressure sensor capable of converting gas pressure into an electrical signal. 4. The air permeability tester according to claim 2, characterized in that: said flow sensor is a mass flow meter. 5. The gas permeability tester according to claim 2, wherein the flow sensor is a mass flow controller. 6. The gas permeability tester according to claim 3, wherein the pressure sensor is a pressure transmitter.

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