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Low-flow gas flowmeter and calibration method therefor
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A technology of gas flowmeter and small flow, which is applied in the field of measurement, can solve the problems of inconvenient testing, difficulty in meeting the requirements of testing range and testing accuracy, etc., and achieve the effect of improving the measuring range and measuring accuracy
Active Publication Date: 2017-09-08
HEFEI JIANGHANG AIRCRAFT EQUIP CORP LTD
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Problems solved by technology
The current orifice flowmeter, venturi flowmeter, nozzle flowmeter and rotameter are difficult to integrate with the equipment tester, which brings inconvenience to the test. The test range and test accuracy of the above-mentioned flowmeters are difficult to meet the requirements of use. In order to improve the measurement range and measurement accuracy of the equipment tester, a gas flowmeter that is easy to integrate with the equipment tester is needed
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Embodiment 1
[0022] Embodiment 1: the distance L1=160mm between the axis of the high-pressure side pressure-taking port 1b and the axis of the low-pressure side pressure-taking port 1c, L2=200mm, D=50mm, and the filling density of the glass wool felt sheet 3 is 0.7g / cm 3 .
[0023] Calibration method of small flow gas flowmeter:
[0024] 1. Determine that the gas medium is oxygen;
[0025] 2. Determine the metering device: use a soap film gas flow metering device for calibration;
[0026] 3. Install the calibrated small flow gas flowmeter: connect the calibrated small flow gas flowmeter to the calibration system of the soap film gas flow device;
[0027] 4. Corresponding curve between calibration pressure difference and flow value: turn on the switch in the calibration pipeline, adjust the gas source pressure to a small flow gas flowmeter, the operating pressure value is 0.1MPa, adjust the flow valve to a flow state, and let the gas flow through The calibrated small flow gas flowmeter e...
Embodiment 2
[0028] Embodiment 2: the distance L1=270mm, L2=300mm, D=80mm, the packing density of glass wool felt sheet 3 is 0.7g / cm 3 .
[0029] Calibration method of small flow gas flowmeter:
[0030] 1. Make sure the gas medium is air;
[0031] 2. Determine the metering device: use a soap film gas flow metering device for calibration;
[0032] 3. Install the calibrated small flow gas flowmeter: connect the calibrated small flow gas flowmeter to the calibration system of the soap film gas flow device;
[0033] 4. Corresponding curve between calibration pressure difference and flow value: turn on the switch in the calibration pipeline, adjust the gas source pressure to a small flow gas flowmeter, the operating pressure value is 0.1MPa, adjust the flow valve to a flow state, and let the gas flow through The calibrated small flow gas flowmeter enters the soap film liquid of the soap film gas flowmeter, blows up the soap film and moves upward along the soap film tube, records the start po...
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Abstract
The invention belongs to a metering technique and relates to the improvement for a gas flowmeter and a calibration method for the gas flowmeter. The gas flowmeter provided by the invention is characterized by comprising a shell (1), an end cover (2), a glass cloth roll (3), a first pressure sensor (4) and a second pressure sensor (5). The calibration method provided by the invention comprises the following steps: determining a gas medium; determining a metering device; mounting a calibrated layered flow type gas flowmeter; inflating a bell jar type gas flowmeter; calibrating a curve corresponding to a pressure difference under pressure values and a flow value. The layered flow type gas flowmeter and the calibration method provided by the invention can be conveniently integrated with an equipment tester and can promote the measuring scope and the measuring precision of the equipment tester.
Description
technical field [0001] The invention belongs to the metering technology, and relates to the improvement of the gas flow meter and the calibration method of the gas flow meter. Background technique [0002] The airtightness test of the oxygen supply system and its components requires the selection of a test method and flowmeter suitable for the test range. The current orifice flowmeter, venturi flowmeter, nozzle flowmeter and rotameter are difficult to integrate with the equipment tester, which brings inconvenience to the test. The test range and test accuracy of the above-mentioned flowmeters are difficult to meet the requirements of use. In order to improve the measurement range and measurement accuracy of the equipment tester, a gas flowmeter that is easy to integrate with the equipment tester is needed. Contents of the invention [0003] The purpose of the present invention is: to propose a kind of small flow gas flowmeter and calibration method, so that integrate with...
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