A vacuum generator is a new type of high-efficiency, clean, economical, and small vacuum component that uses a positive pressure air source to generate negative pressure. It becomes very easy and convenient to obtain negative pressure in places. Vacuum generators are widely used in industrial automation in the fields of machinery, electronics, packaging, printing, plastics and robotics. The traditional use of vacuum generators is to cooperate with suction cups for adsorption and handling of various materials, especially suitable for adsorption of fragile, soft, thin non-ferrous, non-metallic materials or spherical objects. In this type of application, a common feature is that the required pumping volume is small, the vacuum degree is not required, and the operation is intermittent.

      The working principle of the vacuum generator is to use the nozzle to spray compressed air at a high speed, form a jet at the nozzle outlet, and generate entrainment flow. Under the action of entrainment, the air around the nozzle outlet is continuously sucked away, so that the adsorption chamber The pressure inside drops below atmospheric pressure, forming a certain degree of vacuum.

 Definition of vacuum: refers to the gas state in a given space with a pressure lower than 101325 Pascals (that is, a standard atmospheric pressure of about 101KPa).

 There are usually two methods for the identification of vacuum degree:

 1) "absolute pressure", "absolute vacuum degree" (that is, how much pressure is higher than "theoretical vacuum");

 In practice, the absolute pressure of vacuum is between 0 and 101.325KPa. The absolute pressure value needs to be measured with an absolute pressure instrument. At 20°C and altitude = 0, the initial value of the instrument (absolute vacuum gauge) used to measure the vacuum degree is 101.325KPa (that is, a standard atmospheric pressure).

 2) "relative pressure", "relative vacuum" (that is, how much pressure is lower than "atmospheric pressure") to identify.

 "Relative vacuum" refers to the difference between the pressure of the measured object and the atmospheric pressure of the measurement location. Measured with an ordinary vacuum gauge. When there is no vacuum (ie, normal pressure), the initial value of the table is 0. When measuring vacuum, its value is between 0 and -101.325KPa (usually expressed as a negative number).

 For example, if the measurement value of a vacuum generator is -75KPa, it means that the vacuum generator can be pumped to a vacuum state that is 75KPa lower than the atmospheric pressure at the measurement site.

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 The vacuum pressure switch of our company expresses the value by relative vacuum degree

 Unit conversion:

 Commonly used units of vacuum degree are Pa, Kpa, Mpa, atmospheric pressure, kilogram (Kg/cm2), mmHg, mbar, bar, PSI, atm, etc. The approximate conversion relationship is as follows:

1MPa=1000KPa

1KPa=1000Pa

1 Standard atmospheric pressure=1bar=1000mbar=100KPa=0.1MPa (Approximate value, approximate calculation in less demanding occasions, for rough calculation)

1 standard atmospheric pressure = 1 kilogram (Kg/cm2) (approximate value, used for rough calculation) = 760mmHg

1 standard atmospheric pressure=1bar=14.5PSI (approximate value, for rough calculation)

1KPa=10mbar

1atm=101325Pa (atm represents a standard atmospheric pressure as a reference)

 Definition of a standard atmospheric pressure: the pressure at sea level with a temperature of 0°C and a latitude of 45 degrees is called 1 atmosphere pressure, and the value on the mercury barometer is 760 mm of mercury column height.

PSI English full name is Pounds per square inch. P is pounds, S is square, and I is inches. Converting all the units to metric units can be calculated: 1bar≈14.5psi 1psi=6.895kPa=0.06895bar European and American countries are accustomed to using psi as a unit