Which vacuum pump
In selecting vacuum pump, various factors such as model, material, driving mode, use, type, performance, pump shaft position, vacuum degree, etc. shall be considered, such as cast iron, cast aluminum, cast steel, aluminum alloy, stainless steel, etc.; gas capture pump, gas transfer pump, vacuum pump, etc.; vacuum pump, booster pump, chemical pump, vacuum pump, etc. shall be used.
1. Each vacuum pump has main performance indexes, such as limit vacuum, pumping rate, pumping capacity, maximum back pressure and starting pressure.
1) Limit vacuum refers to the stable minimum pressure of vacuum system or vacuum pump after fully pumping under given conditions.
2) The pumping rate refers to the volume of gas extracted from the plane of suction port of vacuum pump in unit time under a certain temperature and pressure for a given gas, and the unit is Ljs.
3) Air extraction refers to the amount of gas extracted from the plane of the suction port of the pump in a unit time under a certain temperature for a given gas. Flow refers to the amount of gas flowing through the pump or pipeline section in unit time when there is no air release or leakage at standard temperature. Unit: PA. L/s. Flow unit
4) The maximum back pressure refers to the vacuum pump that needs the front stage vacuum. When the back pressure rises to a certain value when it operates under a specified load, the pump will lose its normal pumping capacity. This back pressure is called the maximum back pressure.
5) Starting pressure refers to the pressure that the pump can start to work. After knowing the main performance indexes of vacuum pump, we can use the following methods to keep the brand of vacuum pump stable.
2. You can also visit the company’s production scale, production machinery and equipment, inspection equipment, assembly technology, water (gas) pressure test of vacuum pump, turn to turn impulse withstand voltage test of stator winding of vacuum pump motor, no-load inspection test of vacuum pump, locked rotor inspection test, air extraction of vacuum pump and specified operation performance test of vacuum degree to see if they meet the requirements and record.
3. For example, before purchasing the liquid ring vacuum pump, you can consult with the production supplier to find out how to avoid the corrosion of the liquid ring vacuum pump, because the common liquid ring vacuum pump is made of cast iron. The cast iron material is relatively cheap and more suitable for the user’s economic budget requirements, but it ignores the phenomenon that the impeller is easy to rust. The vacuum pump that does not run for a long time is the most likely to rust. It will be started next time If the vacuum pump is started directly without rust before operation, it is the most likely to damage the motor, which will directly cause the motor to burn. The best solution is not to drain the water in the liquid ring vacuum pump if the ambient temperature is not below zero for a long time, because after the water is drained, it is the most likely to rust the impeller and cause the impeller to get stuck. If there is water in the pump, it will not rust. Many production suppliers tell users to drain the water when they stop using. In fact, this is only to prevent the pump body from being damaged Frost crack is helpful to prevent corrosion. It is wrong to say that stainless steel vacuum pump or stainless steel shaft and stainless steel impeller or copper impeller of cast iron pump body can be used to avoid corrosion.
The price of vacuum pump is about several thousand yuan per set, and the cheaper one is one or two thousand yuan.
When it comes to vacuum pumps, please identify EVP Co., Ltd. Is a professional vacuum product sales and service provider. The company is committed to the research and development, sales, installation and maintenance of vacuum equipment and accessories, vacuum pump oil, vacuum pipe accessories and other products.
