What is the ultimate vacuum: After air pumping of vacuum vessel, the Vacuum Oil Purifier can reach a stable vacuum state, this vacuum pressure is ultimate vacuum.

Ideal vacuum pressure and real vacuum pressure:

In fact, they are very different concepts, the so-called "theoretical vacuum" refers to the ideal state of the vacuum, for example, a closed container of a gas molecules are not, gas pressure is absolutely equal to zero, this state is the ideal vacuum state, which Is usually said that the "theoretical vacuum", only theoretically exist, in fact, can not exist.

"Ultimate vacuum" full name is "ultimate vacuum pressure", refers to the mini-vacuum pump can reach the maximum vacuum. For example, a pumping capacity is very weak micro-vacuum pump, which after infinite time can only be sealed within the container gas pressure from the normal 100KPa down to 95KPa, then 95KPa is the pump's ultimate vacuum, such as Chengdu Air Sea produced PM950.2. For example, there is a very strong vacuum pumping vacuum pump, which can pressure from 100KPa down to 10KPa, then 10KPa is the ultimate vacuum pump, such as Chengdu Air Sea produced VCH1028.

" Ultimate vacuum " is an important parameter of the vacuum pump. It is the characteristic value of the pumping capacity of the reaction pump. It is a value related to the vacuum pump. Different vacuum pumps can have different "ultimate vacuum" degrees. The "theoretical vacuum" is a concept of theoretical research, is to exclude the impact of various practical factors and extract the ideal of a vacuum state.

Vacuum pressure conversion of Oil Purifiers

"Vacuum" as the name suggests is the degree of vacuum. Is a vacuum pump, micro-vacuum pump, micro-pump, micro-pump, micro-pumping pump and other vacuum pumping equipment, a major parameter.

By "vacuum" is meant a gas state at a pressure less than 101325 Pascals (i.e., a standard atmospheric pressure of about 101 kPa) in a given space.

In a vacuum, the degree of gas dilution is usually expressed as the pressure of the gas. Obviously, the smaller the pressure, the thinner the gas is.

There are usually two ways to identify the degree of vacuum:

First, the "absolute pressure", "absolute vacuum" (ie, "theoretical vacuum" high number of signs);

In the actual situation, the absolute pressure of the vacuum pump is between 0 ~ 101.325KPa. Absolute pressure values are measured with absolute pressure gauges. The initial value of the vacuum gauge (absolute vacuum gauge) at 20 ° C, altitude = 0 is 101.325 kPa. (I.e., a standard atmospheric pressure)

The second is to use "relative pressure", "relative vacuum" (that is, "atmospheric pressure" how much lower pressure) to identify.

"Relative vacuum" means the difference between the pressure of the measured object and the atmospheric pressure at the measuring point. Measured with an ordinary vacuum gauge. In the absence of a vacuum (ie, at normal pressure), the initial value of the table is zero. When measuring a vacuum, it has a value between 0 and -101.325 kPa (generally expressed as a negative number).

For example, the micro-vacuum pump measured value of -75KPa, then pump can be drawn to the measurement point of atmospheric pressure lower than 75KPa vacuum state.

Absolute vacuum, absolute pressure ", but" relative vacuum "(relative pressure, vacuum gauge pressure, absolute vacuum, absolute vacuum), but also the absolute pressure, Negative pressure) As the measurement method is simple, measuring instruments are very common, easy to buy and the price is cheap, so there are a wide range of applications. In theory the two can be converted to each other, the two conversion methods are as follows:

Relative Vacuum = Absolute Vacuum (Absolute Pressure) - Measuring the barometric pressure at a point

The absolute pressure of the micro vacuum pump is 80KPa, its relative vacuum degree is about 80-100 = -20Kpa, (the pressure of the measurement site is assumed to be 100KPa), it shows -0.02MPa on the ordinary vacuum meter.

Commonly used in the vacuum unit Pa, Kpa, Mpa, atmospheric pressure, kg (Kgf / cm2), mmHg, mbar, bar, PSI and so on. The approximate conversion relationship is as follows:

1 MPa = 1000 kPa

1KPa = 1000 Pa

1 atm = 100 kPa = 0.1 MPa

1 Atm = 1 kg (Kgf / cm2) = 760 mmHg

1 atm = 14.5 PSI

1KPa = 10 mbar

Mbar = millibar = 1 bar * 0.001 = 100000 Pa * 0.001 = 100 Pa

The h-bar is not a pressure (pressure) unit, it is a quantum physical constant that evolves from the Plank constant. In the order of magnitude of 10 to -34, in joules per second

And bar is the pressure unit - 1bar = 10 ^ 5Pa, that is 10 ^ 5 Newton per square meter.

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