The main parameters of a miniature vacuum pump vacuum, vacuum, negative pressure, flow, pumping rate, voltage, current and so on. Now miniature pump selection, such as miniature vacuum pump, miniature gas pump, micro gas sampling pump, micro gas circulation pump, miniature suction pump, miniature suction pump, mini pump, miniature pump, miniature high pressure pump and other selection A few basic concepts to figure out: 1. Vacuum: refers to the gas pressure in a given space, the pressure is below 101325Pa (100Kpa, that is, a standard atmospheric pressure) of the gas state. In a vacuum, the leanness of a gas is usually expressed as the pressure of the gas. Obviously, the lower the pressure, the thinner the gas. For example, two closed containers, A container gas pressure 50Kpa, B container 30Kpa, B container gas must be thinner than the A container. Industry has a vacuum pump, gas sampling pump, gas circulation pump, suction pump, suction pump and other pump a variety of pumps, the performance of various pumps have a predetermined test method to test the main parameters are: 2. Degree of vacuum: Is to measure the degree of gas thin physical quantities, commonly used unit is Kpa (kPa). It is based on the "theoretical vacuum", because the resulting pressure values ​​are greater than the "theoretical vacuum" pressure value, so it is a positive value. Often called "ultimate vacuum", "absolute vacuum", "absolute pressure." It refers to the vacuum pump connected to the test container, into the gas to be tested after a long time continuous extraction, when the gas pressure in the container does not continue to decline and maintain a certain value, the pressure is called the ultimate vacuum pump. The smaller the value, the closer it is to the theoretical vacuum. 3. Negative pressure: vacuum value measured by ordinary vacuum gauge. Common unit is Kpa (kPa). It is "one atmosphere" as a reference, is measured gas pressure and atmospheric pressure difference. Because the resulting pressure is less than the pressure of "one atmosphere", it is negative. Often called "gauge pressure", "relative vacuum", "relative pressure." Schematic diagram is as follows: 4. Flow: (also known as pumping rate) refers to the suction port in the vacuum pump, the unit of time through the gas volume. Common unit is: L / Min (L / min). The "flow" parameter, unless otherwise specified, refers to "peak flow" at 20 ° C, normal atmospheric pressure. The degree of vacuum indicator is a major indicator pursued by manufacturers in various countries. It reflects the overall strength of corresponding mechanical processing, sealing technology and material science. To increase the vacuum index, there must be a higher sealing conditions, so you need to use more precise size, material properties and more excellent parts, so the production cost is greatly increased. And the price increase is much larger than the increase of vacuum index. Of course, the increase in pumping rate will also cause the price to rise, but its rate of increase is small. Therefore, the choice of miniature vacuum pump, miniature gas sampling pump, miniature gas circulation pump, miniature suction pump, micro suction pump and other micro-pump, you need to seriously consider the vacuum index, pumping rate indicators, their own use, etc. For more information, see "Miniature Vacuum Pumps, Micro Air Pumps How to Select (), in order to best use both performance and cost.High vacuum degree of micro-pump with a very precise sealing parts, so it clean the working environment For example, there is a high degree of vacuum domestic miniature vacuum pump VCH1028, its degree of vacuum to 10KPa (0.01MPa absolute pressure), can be roughly understood as a can be a closed container Within 90% of the gas pumped 90%, leaving only 10%, even in the micro-vacuum pump is very high, even with the same type of miniature vacuum pump than the same foreign ratio. 5. Voltage refers to the normal work of the pump power supply, For example, 12V DC refers to the need through the transformer, switching DC power supply 220V AC (AC) into 12V DC (DC), or Connected to a DC power source such as a battery 6. Current refers to the current required to operate the pump at rated voltage, depending on the pump load, the greater the load, the greater the current, but our miniature vacuum pumps are low- In addition to individual models, usually in mA (milliampere) meter.