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Method and device for discharge measurement

A flow measurement and flow technology, which is applied in the measurement of flow/mass flow, measurement device, volume measurement, etc., can solve problems such as uneconomical, increased price of isothermal containers, and inability to measure flow characteristics with high accuracy, and achieves a simple calculation formula. Effect

Inactive Publication Date: 2007-03-07
TOKYO METER
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Problems solved by technology

Therefore, the temperature in the isothermal container changes, and there is a problem that it is impossible to accurately measure the flow rate characteristics at this time, that is, especially at the initial stage when the air starts to flow in and the initial stage when the air starts to flow out.
[0006] Here, in order to further achieve isothermalization of the temperature in the isothermalization container with high precision, it is conceivable to use a material with a higher heat transfer rate as the filling material, but in order to ensure sufficient accuracy, the price of the isothermalization container increases, and it is very difficult Uneconomical

Method used

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  • Method and device for discharge measurement

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Embodiment 1

[0101] Examples of the present invention will be described below. In this example, the flow rate characteristic of the pneumatic device 100 for a test was measured using the flow rate measuring device 1 of the above-mentioned embodiment.

[0102] The volume of the isothermal container 2 is 4.91, and the release initial pressure is 0.6 MPa. The thermal conductivity material filled inside is 0.75 kg of copper wire with a diameter of 50 μm, and the weight filling rate is 0.150 kg / dm 3 .

[0103] As the pneumatic device 100 for the test, a solenoid valve of model VT307-5G-01 was used. In addition, room temperature (atmospheric temperature θ a ) is 280C.

[0104] In the temperature response determination process, after the compressed air in the isothermal container 2 starts to be released, the on-off valve 3 is closed every 0.5 seconds to stop releasing the compressed air, and the pressure at the time of release stop is measured by the pressure sensor 5 (release stop constant ...

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Abstract

Compressed air in a temperature equalizing container (2) is discharged to a sample pneumatic apparatus (100) where temperature response to time is measured and a time function of heat transfer coefficient is determined. In a flow rate operating process, flow rate of the sample pneumatic apparatus (100) is determined from pressure response to time using the function of heat transfer coefficient. Since a flow rate operating expression used in the flow rate operating process is provided with a correction term introduced with energy equation in the temperature equalizing container (2), an accurate flow rate can be measured even if temperature in the temperature equalizing container (2) is not equalized strictly.

Description

technical field [0001] The present invention relates to a flow measurement method and a flow measurement device for measuring flow characteristics using an isothermal device. Background technique [0002] Conventionally, there has been a method of using an isothermal container as a method of obtaining the flow rate characteristics of fluid pressure devices represented by pneumatic devices such as solenoid valves and joints used in pneumatic lines (for example, see Patent Document 1). In this method, an isothermal container is placed between the supply source of compressed air and the air pressure device to be measured, the pressure response in the isothermal container is measured, and the instantaneous flow rate of compressed air is calculated by differentiating the pressure response. , to obtain the flow characteristics of the pneumatic instrument. At this time, the isothermal container is filled with a thermally conductive material such as metal, and by forming the therma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/34G01F1/00
CPCG01F15/024G01F1/34G01F1/00G01F1/50
Inventor 小仓厚小林敏也
Owner TOKYO METER
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