Sealed vacuum pump working principle
The use of oil to keep moving parts of the seal, depending on the pump chamber volume change to achieve the mechanical vacuum pump suction pump oil seal. Their working principle is to make the pump chamber volume increases and decreases mechanically and exhaust. When the working chamber volume in the pump chamber becomes minimal, it communicates with the inlet pipe of the pump, whereupon the gas enters the pump suction chamber until the suction chamber volume is maximized and re- separated from the intake port. When the volume decreases, the gas is compressed until the pressure of the gas is greater than one atmosphere and the vent valve is opened to vent the gas.
The need to seal the pump fluid with oil
The current use of mechanical vacuum pumps, even if the best designed, the movement between the parts with high accuracy. It is also difficult to prevent gas from "breaking" backflow from the low vacuum end to the inlet end when the pump reaches the ultimate vacuum. In addition, because the pump in the design and manufacture and assembly of unavoidable harmful space, which also reduces the ultimate vacuum pump. Oil-sealed vacuum pumps use oil to seal off parts that move toward each other and exhaust valve components. Filling unfavorable spaces makes the chances of a "breakthrough" of high-pressure gas much less and sealing performance so much that the pump Can achieve a higher degree of vacuum.
Oil seal vacuum pump applications
Oil-sealed vacuum pump in accordance with the structure can be divided into fixed-chip, rotary chip, slide valve, trochoidal four. At present, the oil-sealed vacuum pump is one of the most widely used vacuum access technologies in China. It can be used alone as an exhaust pump for low-vacuum equipment and as a front-stage vacuum pump for high-vacuum exhaust. Widely used in the vacuum industry, oil-sealed mechanical vacuum pumps are mostly medium and small rotary vane pumps and medium and large-sized slide valve pumps. Therefore, it has played an increasingly important role in many sectors of the national economy, such as electric vacuum, electronics, light chemicals, steel, non-ferrous smelting and other industrial sectors. As the oil-sealed vacuum pumps are equipped with gas-ballast, it can also be extracted damp gas. But now it is not suitable for pumping high oxygen content, explosive, corrosive to ferrous metals, chemical effect on the pump seal oil, and particles containing dust gas.
At present, many domestic research institutes and manufacturers are designing and producing a series of oil-sealed vacuum pumps that draw water vapor and corrosion-resistant. With the development and application of new technologies and new materials, all kinds of oil-sealed vacuum pumps with better adaptability to meet various industrial needs will surely be produced.
Marco Lift (Ningbo) Co., Ltd. , https://www.marcolift-asia.com