Rotary Vane Vacuum Pump for Thermal Analysis Industry

Rotary vane vacuum pumps are widely used in various fields of scientific research and industrial production. For example, vacuum smelting, vacuum degassing, vacuum casting, vacuum rolling, ion nitriding, vacuum carburizing, vacuum quenching, vacuum impregnation, light bulb manufacturing, electronic tube semiconductor device manufacturing, etc.

 

Due to the small number of gas molecules in a vacuum environment, the harmful effects of gas molecules can be avoided. For example, heat treatment in vacuum can avoid grading and gas infiltration into the metal structure. Vacuum degassing of molten steel before casting can not only discharge bubbles in molten steel, but also discharge a lot of slag inclusions, thereby improving product quality. 

 

Adsorption and desorption experiments are commonly used methods for chemical catalysis characterization, which generally require analysis in a high vacuum environment.  

 

The chemisorber is an important instrument for dynamic temperature-programmed research. It can conduct TPD, TPO, TPR, TPS, TPSR and other studies on catalysts, in order to conduct detailed qualitative and quantitative analysis of the products generated during the temperature-programmed process (ie. In order to identify and detect the type of escaping gas), it is often necessary to combine with online mass spectrometry.  

 

Thermogravimetric mass spectrometry, TG or TGA, refers to a technique that measures the mass of a sample to be tested as a function of temperature at a programmed temperature to study the thermal stability and composition of materials. Thermogravimetric mass spectrometry can study changes in crystal properties, thermal stability of substances, decomposition process, dissociation, redox, quantitative analysis of components, moisture and volatile, reaction kinetics and other properties.  

 

The combination of an online mass spectrometer and a thermogravimetric analyzer (TGA) can rapidly analyze the gas products evolved during the thermogravimetric test. It has been widely used in the development of inorganic and other composite materials.  

 

In the application of rotary vane vacuum pump in the thermal analysis industry, how to determine the parameters of vacuum pump selection?  

  1. Physical and chemical properties of the pumped gas

The physical and chemical performance quality of the pumped gas affects the performance, material and structure of the pump, and is an important factor to be considered when selecting a model. The physical and chemical properties of the gas include corrosiveness, abrasiveness, toxicity, etc., and whether the pumped gas contains particle content and particle size, density, annual, vaporization pressure, etc.  

 

  1. Parameters  

Parameters are the most important indicators of vacuum pump selection, and should be carefully determined according to the process and the range of operation changes.  

  • Pumping speed Q refers to the air volume required to be pumped out by the vacuum pump in the production of the process device. Generally, the user should give the normal, minimum and maximum pumping speed. The pumping speed and capacity indicated on the vacuum pump nameplate are generally normal use or rated flow. When choosing a vacuum pump, it needs to be larger than the flow required by the system. Generally, it is about 1.1 to 1.15 times the normal flow.  

 

  • The inlet pressure and outlet pressure refer to the pressure at the inlet and outlet flanges of the vacuum pump. The inlet and outlet pressures affect the pressure resistance of the pump chamber and the requirements of the shaft seal.  

 

  • Temperature refers to the inlet air temperature of the vacuum pump. Generally, the normal, minimum and maximum temperatures of the inlet air of the vacuum pump in the process should be given.  

 

  • Vacuum degree refers to the pressure required in the production process.

 

 


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