What is the vacuum degree of a micro air pump?

The so-called vacuum refers to the gas state in a given space where the pressure is lower than 101325Pa. In a vacuum state, the rarefaction of a gas is usually expressed by the pressure value of the gas. Obviously, the smaller the pressure value, the thinner the gas. There are various types of micro air pumps in industry, and there are prescribed test methods to check the performance of various pumps. The main parameters are:

1. Ultimate vacuum (usually called vacuum degree): Connect the micro air pump to the detection container, put in the gas to be measured, and continue to micro air pump for a long time. When the gas pressure in the container no longer drops and maintains a certain value, This pressure is called the ultimate vacuum of the micro air pump. The smaller the value, the closer it is to the theoretical vacuum.

2. The vacuum value (ie: gauge pressure) measured by an ordinary vacuum gauge is the relative vacuum degree, expressed as a negative number, which refers to the difference between the measured gas pressure and the atmospheric pressure.

3. Pumping speed: the volume of gas flowing through the suction port of the micro air pump per unit time.

Traditional industrial vacuum pumps are generally large in size, and the operation of the pump requires special micro air pump oil and lubricating oil, and the medium gas will contain a large amount of oil mist. With the development of the instrumentation industry and people’s requirements for environmental protection, miniature oil-free vacuum pumps have emerged in various countries.

The following rules generally apply: the price of the pump is closely related to the vacuum index. The vacuum degree index is the main index that manufacturers in various countries strive to pursue. It reflects the overall strength of the corresponding fields such as mechanical processing, sealing technology, and material science. It is also an important means for manufacturers to obtain profits. To improve the vacuum index, higher sealing conditions are necessary.

Therefore, parts with more precise dimensions and better material properties need to be used, so the production cost increases significantly. Moreover, the increase in price is much greater than the increase in vacuum index. Of course, the increase in pumping rate will also cause the price to rise, but the increase will not be large. Therefore, when choosing a micro air pump, you need to carefully consider the vacuum degree index, pumping rate index, your own usage, etc., so as to best balance performance and cost.

Since the high-vacuum micro pump uses very precise sealing parts, so it has higher requirements for the cleaning conditions of the working environment, temperature parameters, medium composition and so on.

Conversion of micro pump vacuum degree and adsorption force:

People who don’t understand the purpose of micro pumps must not know the relationship between the vacuum degree and adsorption force of micro pumps. The two can be converted.

Many customers purchase micro air pumps for vacuum adsorption, and they will encounter such problems during use. The conventional parameters on micro pumps include flow, vacuum, peak flow, rated voltage, rated current, etc. But there is no adsorption force.The objects to be suctioned are of different sizes and specifications, so the required adsorption force is naturally different. How can I effectively control the range of this adsorption force to achieve more efficient and better performance? What about precise adsorption?

The output vacuum degree and adsorption force can be converted, and the formula is as follows:

Adsorption force (kg force) = relative vacuum degree (KPa) ÷ 100 × effective adsorption area (area of ​​the suction cup) (cm2)

Of course, the formula is always theoretical. In actual use, there will be some other factors, such as a certain degree of vacuum leakage, which is related to the flow rate. In theory, the size of the adsorption force has nothing to do with the flow rate of the pump, but in actual use it is related to the flow parameters, because the gas circuit system cannot achieve a theoretical seal and there will always be a certain amount of leakage. In this case, the greater the flow rate of the micro air pump and the smaller the proportion of leakage, the more conducive it is for the pump to maintain a higher vacuum degree, thereby obtaining greater adsorption force.

For example: There are two pumps with the same ultimate vacuum degree. The flow rate of micro air pump A is 1 L/min and the flow rate of pump B is 20 L/min. Similarly, in the case of leakage of 0.1 L/min, the vacuum degree of pump A will be reduced a lot. Because a leakage of 0.1 L/min is too big for it. However, a leakage of 0.1 L/min is nothing to the B pump, and it can still maintain a high vacuum degree. Therefore, although the vacuum degree of the two is the same, in practice, the adsorption force generated by the B pump is greater.

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