Piston Vacuum Pump Characteristics

The rotary vane vacuum pump is mainly composed of stator, rotor, rotary vane, fixed cover, spring and other parts. The structure is composed of a rotor eccentrically mounted in the stator cavity (the clearance between the outer circle of the rotor and the inner surface of the stator is very small) and two rotating plates which slide in the rotor slot and are attached to the inner wall of the stator by spring tension and centrifugal force. When the rotor rotates, it always slides along the inner wall of the stator. The crescent space enclosed by the rotor, stator cavity and fixed cover is divided into three parts: A, B and C. When the rotor rotates in the graphic direction, the volume of space A connected with the suction port increases continuously, and the pressure of space A decreases continuously. When the pressure in space A is lower than that in the sucked container, according to the principle of gas pressure balance, the sucked gas is continuously pumped. The suction chamber A is being sucked in. The volume of B-cavity space is gradually decreasing, and the pressure is continuously increasing. At this time, it is in the process of compression. The volume of space C connected with the exhaust port is further reduced, and the pressure of space C is further increased. When the pressure of the gas is stronger than the exhaust pressure, the compressed gas pushes the exhaust valve open, and the pumped gas continuously passes through the oil reservoir in the tank and is discharged into the atmosphere. During the continuous operation of the pump, the process of suction, compression and exhaust is continuously carried out so as to achieve continuity. The purpose of aspiration. In water ring pump, auxiliary exhaust valve is a special structure, usually rubber ball valve is used. Its function is to eliminate the phenomenon of over-compression and under-compression during the operation of the pump. Both phenomena can cause excessive power consumption.vacuum-pumps-for-rotary-evaporation

Because the water ring vacuum pump has no direct exhaust valve, and the exhaust pressure is always fixed, the compression ratio of the water ring pump depends on the termination position of the intake port and the starting position of the exhaust port. However, these two positions are fixed and unchanged, so they are not suitable for the need of the change of the inhalation pressure. In order to solve this problem, rubber ball valves are usually installed under the exhaust outlet, so that when the exhaust pressure is reached too early in the pump chamber, the ball valve opens automatically and the gas is discharged, eliminating the phenomenon of over-compression. Generally, the compression ratio is determined by the lowest suction pressure in the design of water ring pump, so as to determine the starting position of the exhaust port, thus solving the problem of insufficient compression. "The pumping principle of sliding valve vacuum pump is similar to that of sheet pump when their structures are different.piston-vacuum-pump-for-sale

Piston vacuum pump is a kind of piston vacuum pump, which uses slide valve mechanism to change the volume of the Western air chamber. Piston vacuum pump is an old pump, but compared with rotary vane pump, it has the outstanding characteristics of allowing high working pressure (104pa), large pumping capacity, continuous working in harsh environment and durability, so it has been widely used in vacuum smelting, vacuum drying, vacuum impregnation, vacuum distillation and other industries. At present, oil-sealed vacuum pumps widely used in the vacuum industry are mostly medium-sized and small-sized chip selection pumps and medium-sized and large-scale piston vacuum pumps. Under dirty working conditions, the rotary vane pump is stuck in the rotor slot.piston-vacuum-pump-manufacturer