Compressor tank negative pressure gauge! ! !
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This post was last edited by 955559 on 2018-12-23 09:59 A negative pressure gauge for compressor oil tank oil is designed to form a certain negative pressure on the upper surface of the oil tank, which is smaller than atmospheric pressure, so that the lubricating oil used in the gear box and rotor bearings can flow back smoothly. There is a negative pressure gauge on the fuel tank, the unit is "cm of water". There is an air line connected to the upper part of the fuel tank, and a three-way valve is used to achieve the purpose of "pumping" and achieve negative pressure. Could you please describe the relationship between the unit "cm of water" and atmospheric pressure and absolute pressure? I don't quite understand, thank you! The main thing is to understand the relationship between the unit "cm of water" and other pressures.
“The Chinese phrase "cm of water" means centimeters of water column, which means it is a unit of pressure. Because 1 millimeter of water column is converted into kilopascals: From p=ρgh, g=9.8m/s^2=9.8N/kg, it can be seen that 1kPa=1000Pa=1000kg/m^3 * g * h, substitute the data to get h=0.102m, so 1 kilopascal is equivalent to 102 mm of water column. So one millimeter of water column = 1/102 kilopascal, which is 0.0098 kilopascal. And because 1 centimeter of water column is 10 times that of 1 millimeter of water column, it is 0.098 kPa.
Thanks for the reply, it's very thorough and I understand. :handshake
In addition, for the convenience of reading, you can think of this as a hectopameter with a range of 0 to 50 hectopascals, which is actually equivalent to 0 to 5 kilopascals.