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Reciprocating vacuum pump working principle
Reciprocating vacuum pump (also known as piston vacuum pump), belonging to one of the low vacuum equipment, its ultimate pressure is generally 1330 ~ 2660Pa, its pumping speed range is relatively large, from 50L / S to 200L / S, suitable for petroleum, Vacuum impregnation in the chemical, pharmaceutical, foodstuff, light industry, metallurgy and electrical industries, vacuum treatment of molten steel, vacuum distillation, vacuum evaporation, vacuum concentration, vacuum crystallization, vacuum drying, vacuum filtration and concrete vacuum work gas. Reciprocating vacuum pumps are not suitable for pumping high oxygen content, explosive, corrosive metals, chemically react with pump oil and gas containing particulate dust, nor is it suitable for conveying gas from a container To another container, as a transfer pump. Figure shows the working principle of reciprocating vacuum pump, reciprocating vacuum pump is the main components of the cylinder 1 and reciprocating linear motion in which the piston 2, the piston is driven by the crank connecting rod mechanism 3 (including the crosshead) to complete. In addition to the main components mentioned above, there are also important components such as the exhaust valve 4 and the intake valve 5 as well as the auxiliary components such as the base, crankcase, dynamic seal and static seal. Operation, the motor driven by the crank-rod mechanism (rotary motion into linear motion), the cylinder reciprocating piston. When the piston moves from the left end to the right end in the cylinder, the pressure in the left chamber decreases continuously as the volume of the left chamber of the cylinder increases. When the pressure in the left chamber is lower than the pressure in the container, Balance principle, the gas inside the container is continuously drawn into the left lumen through the inhalation valve 5, and the air is being inhaled at this moment. When the piston reaches the rightmost position, the left chamber of the cylinder is filled with gas. Then the piston moves from the right end to the left end, at this time, the intake valve 5 is automatically closed. The gas is gradually compressed as the piston moves from right to left. When the gas in the cylinder reaches the exhaust pressure, the exhaust valve 4 is opened at this time, and the gas is discharged to complete a working cycle. When the piston moves from the left end to the right end, the above cycle is repeated until a certain equilibrium pressure is reached by the drawn vessel. In the reciprocating pump, the intake valve and the exhaust valve are very important parts and are vulnerable parts, their work will have a direct impact on the reciprocating pump ultimate pressure, pumping rate, power consumption and operational reliability.