Jan 12
20
author of the article Chinaogpe
Introduction to the vacuum pump provides vacuum less than atmospheric pressure in a variety of industrial and scientific applications. Different technologies are used in industrial pumps and compelling stretching, laboratory degassing and cleaning areas in the chemical and semiconductor process equipment. Usually they are dimensioned air-flow-volume end of the pressure difference between the pump. Motor is a reference value is used to describe the size of the vacuum pump.
type vacuum Vacuum pumps are mechanical type, high and ultrahigh vacuum-type, and the venturi jet. A variety of mechanical compression / extraction systems are used for low pressure to produce vacuum pumps typically operate at the most efficient coarse-to medium-range vacuum. They are often used as a base, or a first high-powered vacuum pump. Mechanical types are both positive and non-displacement pumps. High and ultrahigh types of pumps that are effective in the molecular flow regime and the need to properly support the pump. Very low blood pressure or high vacuum, gases behave like a collection of individual molecules and pump technologies, the preferential interest rate differential, so the mean free path or stairway molecules are employed. High vacuum pumps and the use of a small manufacturing processes and a wide range of analytical tools. Fluid jet or venturi vacuum generators rely on the flow of compressed air, gas or liquid, such as “motive” to the fluid withdrawal, or a vacuum to create the desired port. They have no moving parts and does not need more power than the compressed fluid. Common configurations vacuum pumps are single pump, or a combination of multi-pump technology and pump system or drive. The essential background is high vacuum pump system, mechanical, sorption, or other support includes a vacuum pump to provide a first level of vacuum in the vacuum pump.Performance indices (1) Vacuum degree is usually vacuum degree can be expressed in the following ways. ? the degree of vacuum can be expressed as an absolute pressure P, the unit is kPa, Torr. ? Vacuum degree can be expressed as the relative pressure p, the unit is kPa, mmHg, respectively. p (kPa) = 101.32, p (kPa), p (mm Hg) = 760 P (Torr) 1 Torr = 1 mm Hg (2) Exhaust speedExhaust refers to the speed of the gas per unit volumeof vacuum of power below the state intake (ie, the flow of the vacuum pump suction pressure and temperature), the unit is m / h or m / min speed of the exhaust gas connected to the vacuum pump suction pressure. A lower suction pressure, the lower exhaust gas velocity. When the final vacuum is reached, the exhaust gas velocity is zero. (3) Ultimate vacuum vacuum Ultimate refers to the minimum stable value of the vacuum pressure can be achieved at the same time depletion of air, known as the maximum vacuum level. (4) Exhaust ers = 2.3 (V / S), LG (P1 / P2) If t – exhaust, min, V-volume vacuum system, m, S-vacuum exhaust velocity, m / min, p1 – the first vacuum pressure system, kPa, the pressure P2 of the final vacuum system, vacuum system air leakage Kpa.Estimate hope that all of the vacuum system is completely gas-tight, with a view to the best way to apply to come. In fact, when the air vacuum system leaks. The best way to get the amount of air leakage system knows that it is experimentally measured. But the new design or a conference, where the trial is not feasible, the system air leakage to an approximate calculation. (1) The leakage can be estimated from the length of the integration of a harbor seal. The estimated leakage is based on the length of the seal connecting the jointThe seal of quality by connecting the common drain D / kg. (Hm) Very good 0.03Good 0.1Normal 0.2 (2) The leakage can be estimated from the amount of vacuum system leakage based on the estimated amount of the vacuum system volume to 0.1 1.0 3 5 10 25 50 100 200Average air leak / kg . h ~ 0.1 0.5 0.5 1.0 1 ~ ~ 2 2 ~ March 4 ~ April 6 ~ 8 5 ~ August 10 ~ October 20 ~ 30Vacuum pump selection ? Determine the vacuum degree of vacuum level (absolute pressure) at the pump suction will be determined by the vacuum degree of vacuum system and pressure drop in the suction duct. ? Set the exhaust air speedExhaust speed vacuum system is defined by a special formula. ? Convert the above exhaust outlet speedThe speed to exhaust conditions to convert the sample rate of the book by the pump manufacturer to control. ? Select the type of vacuum pump typeThe can be determined based on the requirements of the exhaust gas velocity and the vacuum degree. About the authorogpe.com China (http://www.china-ogpe.com) is a professional B2B website, which focuses exclusively on providing you with product information and information about trade in oil, gas and petrochemical installations made in China.