Three minutes teach you to know the miniature vacuum pump

The vacuum mentioned here refers to a gas state in which the pressure value is lower than 101325 Pa in a given space, that is, lower than a standard atmospheric pressure. In the vacuum state, the leanness of the gas is usually expressed by the pressure value of the gas, and the smaller the pressure value, the thinner the gas. There are a variety of vacuum pumps in the industry. For the performance testing of various pumps, the general parameters include the following:

1. Ultimate vacuum (usually called vacuum degree): Connect the vacuum pump to the inspection vessel, put in the gas to be measured, and conduct continuous gas extraction for a long time. When the gas pressure in the vessel no longer decreases and maintain a certain value, This pressure is called the ultimate vacuum of the pump. The smaller the value, the closer to the theoretical vacuum.

The vacuum value measured by an ordinary vacuum meter (ie, gauge pressure) is a relative vacuum degree, and is represented by a negative number, which refers to the difference between the measured gas pressure and the atmospheric pressure. It can be seen from the figure below.

2. Pumping rate: The volume of gas flowing through the suction port of the vacuum pump per unit time.

The volume of vacuum pumps used in traditional industries is generally large, and the pump operation requires special vacuum pump oil and lubrication oil, and the medium gas contains 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. In addition to this, after special technical improvements, in addition to a single pumping vacuum pump, a miniature vacuum pump for pumping and pumping is also formed (that is, the discharge port can generate a relatively large positive pressure) for supercharging and inflating. To overcome the system resistance and so on, as well as very unique water and gas dual-use miniature vacuum pumps, this can be used for long-term idling, dry running and other occasions, unlike the general pump idling or dry running will damage the pump, water and gas dual-use mini Evacuation and dry running of vacuum pumps are all normal tasks.

The price of the miniature oil-free vacuum pump is closely related to the vacuum index. The vacuum index is a major indicator pursued by manufacturers in various countries. It reflects the overall strength of the corresponding areas of machining, sealing, and materials science, and is also an important means for manufacturers to obtain profits. To improve the vacuum index, it is necessary to have higher sealing conditions. Therefore, it is necessary to use components with more precise dimensions and superior material properties, so that the production cost is greatly increased. And the price increase is far greater than the increase in the vacuum degree indicator. Of course, the increase in pumping rate will also cause the price to rise, but its increase is not significant. Therefore, when selecting a microvacuum pump, it is necessary to carefully consider the vacuum degree index, the pumping rate index, and its own use situation, so that the performance and cost can be best taken into account.

High-vacuum micro-pumps have high requirements for the cleaning conditions, temperature parameters, and media components of the work environment due to the use of very precise sealing parts.

Micro vacuum pump suction port or exhaust port can form a pressure difference with the outside atmosphere, and unlike large vacuum pumps that require lubricating oil and vacuum pump oil, it will not contaminate the working medium, but also compact, low noise, maintenance-free, can be continuous for 24 hours Operation, so the micro vacuum pump is used as a power device, widely used in gas sampling, gas circulation, vacuum adsorption, acceleration filtration, automotive vacuum booster and so on, also has been widely used in medical, health, scientific research, environmental protection and other fields.