Micro-vacuum pumps, micro-pump selection of three important indicators

Now miniature pump selection, such as miniature vacuum pump, micro air pump, micro gas sampling pump, micro gas circulation pump, miniature suction pump, miniature suction pump, mini pump, miniature pump, miniature high pressure pump, etc., often involve These three concepts.
First, simply put, these three concepts correspond to the thin, normal, dense state of the gas.
Atmospheric pressure: refers to the pressure of an atmosphere, that is, the gas pressure generated by the atmosphere of our normal life. A standard atmospheric pressure of 101325 Pa (Pascal - commonly used pressure units). 100,000Pa = 100KPa, so a standard atmospheric pressure we often use 100KPa or 101KPa said. In each place, the actual atmospheric pressure is not equal to the standard atmospheric pressure because of its geographical location, altitude and temperature. However, for simplification purposes, atmospheric pressure may sometimes be approximated to be one standard atmospheric pressure, that is, 100 KPa;
Negative pressure: refers to the gas pressure is lower than atmospheric pressure state, which is what we often say vacuum. For example, when using a tube to drink a drink, the tube is underpressure; the suction cup used to hang things is also underpressure.
Positive pressure: refers to the gas pressure higher than atmospheric pressure state. For example, when a bicycle or a car tire is inflated, the positive pressure is generated at the air outlet end of the inflator or inflator.
Scientific research, bioengineering, automatic control, environmental protection, water treatment and many other applications, often to gas sampling, gas recycling, object adsorption, this time we must use the vacuum pump. Its main parameters are vacuum, flow and so on.
Second, the degree of vacuum generally refers to the pump work, can achieve the ultimate pressure, that is, it can be closed container after the gas is drawn away, leaving the thinner gas.
1. Industry, the ultimate pressure that there can be two, one is the absolute pressure, that is, the absolute vacuum (in theory can reach the absolute vacuum, what material are) zero, marked values ​​are positive , The smaller the figure, the closer to the absolute vacuum, that is, the higher the degree of vacuum. For example, we have a high vacuum miniature vacuum pump VCH1028 (). Its ultimate pressure of 10KPa (0.01MPa), in a miniature vacuum pump, it belongs to a very high degree of vacuum.
2. The other is the relative pressure, that is, as the atmospheric pressure as a null, below atmospheric pressure with a negative value, so called negative pressure. The greater the absolute value of this negative value, the higher the degree of vacuum. For example, we have a negative pressure miniature vacuum pump PH2506B negative pressure of -75KPa (-0.075MPa), there is no VCH1028 high (VCH is-90KPa (-0.09Mpa)). Therefore, the corresponding suction PH2506B nor VCH strong.
International vacuum industry is the most common, but also the most scientific is the use of absolute pressure identification; but because of the relative pressure measurement method is simple, universal measuring instruments (such as the general vacuum gauge are relative pressure gauge), so the domestic habit of using relative pressure to identify.
The relationship between the two: relative pressure = absolute pressure - the local atmospheric pressure.
Such as VCH1028 absolute pressure: 10Kpa, its relative pressure = 10-100 = -90Kpa (-0.09MPa).
Scientific research, laboratory, medical and other fields, often have gas pressurization applications, such as: to their own positive pressure within the container cheer, or greater resistance within the system, you need to overcome the resistance pump to send gas. At this time, you need to be able to pump more positive pressure than atmospheric pressure, usually expressed in relative pressure. Our high-pressure micro-pump, micro-pump PCF5015N maximum output> 100Kpa (0.1MPa) positive pressure, itself belongs to the dry vacuum pump, do not require vacuum pump oil and lubricants, does not pollute the working medium, 24 hours continuous operation, End can be blocked, it is particularly suitable for these occasions.
Third, a comprehensive example:
Simply put, assuming a closed container gas pressure at atmospheric pressure, which means that there are 100 gas molecules, with a negative pressure of-90Kpa VCH1028 can eventually draw away 90, the remaining 10, then the negative pressure inside the container For-90Kpa; replaced PH2506B can only take away 75, the remaining 25, the corresponding container negative pressure of -75Kpa.
If using PCF5015N cheer on this container, then the last container has 200 gas molecules, expressed as absolute pressure 200Kpa, with the relative pressure (positive pressure) is 100Kpa.

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