Vacuum pump 'vacuum' do you understand?

Swept volume swept volume is a measure of the vacuum pump pumping speed factor. General unit with L/S and m&sup 3; / h. To make up for the leakage rate of parameters. It is easy to understand, smoke the same volume of containers, under the theory of why the swept volume of vacuum water pump is easy to take to the vacuum degree necessary for the us, and swept volume of small vacuum pump slowly can't even draw the vacuum degree we want? Pipeline or container to be absolutely impossible to do not leak, and large swept volume makes up for the leakage of vacuum degree brought by the decline factor, large volume is easy to draw the ideal vacuum value. Vacuum said under vacuum gas rare book degree, usually expressed using pressure value. Vacuum values are expressed actual numerical system pressure below the atmospheric pressure value, from the table represented on the table is also known as the pressure values, the industry also known as the limit of relative pressure, practical applications, the vacuum degree absolute vacuum and vacuum relatively two views are often expressed. Read from vacuum gauge numerical said vacuum degree. Vacuum = - atmospheric pressure Absolute pressure ( Atmospheric pressure generally take 101325 pa, water ring vacuum pump absolute pressure limit of 3300 pa; Rotary vane vacuum pump absolute pressure limit about 10 pa) Really empty theory refers to the volume does not contain any material inside. ( In reality there is no real vacuum) Air pressure inside the container below the normal atmospheric pressure (usually 101325 Pa） Is called a vacuum. Absolute vacuum & amp; Relative to the vacuum limit internal pressure is measured relative pressure relative pressure than & other; Atmospheric pressure & throughout; How much lower the pressure. Said the value of the actual numerical system pressure below the atmospheric pressure. Container due to the internal air is pumped, the pressure inside the container was always lower than the external pressure. When using relative pressure or pressure table, numerical must take minus sign in front of the said vessel internal pressure is lower than external pressure. Limit of absolute pressure inside the absolute pressure is measured pressure than & throughout; The theory of vacuum ( Theory of vacuum pressure value is 0 pa) ” How much high pressure. The objects it is vacuum pressure to theory of the state of the absolute value. Due to the limitation of technology, no matter what, we can't to the internal pressure to smoke to absolute vacuum 0 pa this value, the vacuum pump of vacuum value by vacuum value is higher than the theory. So when expressed in absolute vacuum, numerical no minus sign in front of the.
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