What is the difference between a small vacuum pump and a large vacuum pump?

Simply put: high power, high ultimate vacuum (absolute pressure is very small) (the absolute pressure is smaller, the higher the ultimate vacuum), and some can even do 10 negative square Pa, very close to the theoretical vacuum. The pumping rate is large, usually in units of "L/S (liters per second)". There are a wide range of applications in the industry.

Disadvantages: high price, large size, heavy weight, high noise, high energy consumption, need regular maintenance, not easy to move. Some large vacuum pumps must use vacuum pump oil or lubricating oil, which will produce oil mist during work and pollute the working medium. The above disadvantages are particularly noticeable in some occasions. For example, large vacuum pumps have high vacuum, but they are wasted in low vacuum. Like a laboratory, it only requires a pump to perform gas sampling, gas analysis, gas circulation, vacuum adsorption, gas transfer, pressurization, indirect water absorption, drainage, etc. with a small amount of gas, and exposes many of its shortcomings with a large vacuum pump.

At this time, a small vacuum pump is used, and the rough vacuum (lower vacuum) can be satisfied, and the volume is small, the noise is low, the power consumption is small, the operation is easy, the port is easy to carry, the maintenance is free, the battery can be continuously operated for 24 hours, and the medium is rich in water vapor. . The most important thing is that because it is dry and oil-free, vacuum pump oil or lubricating oil is not needed, so it will not pollute the working medium, and will not interfere with the analysis of the medium. And the price is relatively cheaper.

Now, with the wide application of small vacuum pumps in various fields and the improvement of vacuum technology, the performance of small vacuum pumps is also increasing. For example, there is a high vacuum and small vacuum pump. The ultimate vacuum of Chengcheng Electromechanical can even be achieved, that is, negative pressure. About -0.09Mpa; pumping rate up to: 28L / Min; there is a small vacuum pump that can simultaneously pump and pump air, negative pressure (-50KPa), maximum output positive pressure (relative atmospheric pressure) 100KPa (about 1 kg) ).