German AVAC Vrkuumteknik pump AVAC Vrkuumteknik model AVAC Vrkuumteknik price

AVAC Vrkuumteknik pumps are devices or equipment that use mechanical, physical, chemical, or physicochemical methods to evacuate gas from a chamber to achieve vacuum. In simple terms, a vacuum pump is a device that improves, generates, and maintains vacuum in a closed space using various methods. Based on working principles, vacuum pumps are basically divided into two types: gas capture pumps and gas transfer pumps. They are widely used in industries such as metallurgy, chemical processing, food, and electronic coating.

AVAC Vrkuumteknik pump classification

1) Rotary vane vacuum pump: The rotor is installed in the pump housing with a certain eccentricity and is close to the fixed surface of the inner wall of the housing. Two (or more) vanes are installed in the rotor slots. When the rotor rotates, the vanes slide back and forth along their radial slots and remain in contact with the inner wall of the pump housing. These vanes rotate with the rotor, dividing the pump chamber into several variable volumes. 2) Sliding vane vacuum pump: A sliding valve is installed outside the eccentric rotor. The rotation of the rotor drives the sliding valve to slide and roll along the inner wall of the pump housing. The sliding valve rod on the upper part of the sliding valve can slide in a swingable sliding valve guide rail, dividing the pump chamber into two variable volumes. 3) Fixed vane vacuum pump: An eccentric rotor close to the inner surface of the pump is installed inside the pump housing. A radial sliding vane that remains in contact with the rotor surface is installed on the pump housing. When the rotor rotates, the vane slides up and down, dividing the pump chamber into two variable volumes. 4) Trochoidal vacuum pump: A rotor with a trochoidal profile is installed eccentrically in the pump chamber. It rotates along the inner wall of the pump chamber, dividing it into two variable volumes. 5) Multi-chamber rotary vane vacuum pump: Multiple independent working chambers of rotary vane vacuum pumps, driven by the same motor, are installed in parallel within a single pump housing. 6) Dry screw vacuum pump: It is a variable displacement vacuum pump that does not use oil (or liquid) for sealing. 7) Liquid ring vacuum pump: A multi-blade rotor is installed eccentrically in the pump housing. When it rotates, it throws liquid (usually water or oil) against the inner wall of the pump housing to form a liquid ring concentric with the pump housing. The liquid ring and the rotor blades form several small volumes with periodically changing capacities, hence it is also called a rotary variable displacement vacuum pump. 8) Roots vacuum pump: The pump contains two double-lobe or multi-lobe rotors rotating synchronously in opposite directions. Certain clearances are maintained between the rotors and between the rotors and the inner wall of the pump housing. It belongs to the category of rotary variable displacement vacuum pumps. Mechanical booster pumps are vacuum pumps of this type. 9) Drag molecular pump: Gas molecules gain momentum by colliding with high-speed moving rotors and are transported to the outlet; therefore, it is a momentum transfer pump. 10) Turbomolecular pump: The pump contains a slotted disc or bladed rotor that rotates between stator discs (or stationary vanes). The linear velocity at the circumference of the rotor is very high. This type of pump usually operates in the molecular flow regime. 11) Compound molecular pump: It is a compound molecular vacuum pump formed by connecting turbomolecular and drag molecular pumps in series.

AVAC Vrkuumteknik pump structural forms

Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps. As radial piston pumps are a new type of high-efficiency pump with high technical content, with the acceleration of localization, radial piston pumps will inevitably become an important part of the application field of piston pumps. A radial piston pump is a piston pump where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: Drive torque is transmitted from the drive shaft via a cross coupling to the star-shaped hydraulic cylinder block rotor. The stator is not subjected to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged pistons located in the rotor press tightly against the eccentric stroke stator through hydrostatically balanced slipper shoes. The pistons are connected to the slipper shoes via ball joints and locked with snap rings. Two retaining rings hold the slipper shoes against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. When the rotor rotates, due to the eccentricity of the stator, the pistons perform reciprocating motion, and their stroke is 4 times the eccentricity of the stator. The eccentricity of the stator can be adjusted by two pistons located at opposite radial positions on the pump body. Oil inlet and outlet are controlled by flow channels on the pump body and distribution shaft, and by the suction port on the distribution shaft. The hydraulic pressure generated in the pump body is absorbed by the hydrostatically balanced surfaces. The hydrostatic balance of the friction pair adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only serve a supporting role and are not subjected to other external forces. In hydraulic systems: Axial piston pumps operate by utilizing the volume change produced by the reciprocating motion of pistons parallel to the transmission shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, very high precision fits can be achieved during machining.

AVAC Vrkuumteknik pump selection

The function of a vacuum pump is to remove gas molecules from the vacuum chamber, reduce the gas pressure in the vacuum chamber, and achieve the required vacuum level. Broadly speaking, there is a wide range from atmospheric pressure to ultra-high vacuum, and no single vacuum system can cover this entire range to date. Therefore, to meet the process indicators, work efficiency, and equipment service life requirements of different products, different vacuum system configurations need to be selected for different vacuum ranges. To achieve optimal configuration, the following points should be considered when selecting a vacuum system: First, the vacuum level required for each process must be checked and determined. Because each process has its applicable vacuum range, it must be carefully studied and determined. On the basis of determining the vacuum level required by the process, check the ultimate vacuum of the vacuum pump system, because the ultimate vacuum of the system determines the optimal operating vacuum of the system. Generally speaking, the ultimate vacuum of the system is lower than the operating vacuum of the system by 20%, and lower than the ultimate vacuum of the foreline pump by 50%. Check and determine the type of gas to be pumped and the pumping speed required. Because if the type of gas being pumped reacts with the liquid in the pump, the pump system will be contaminated. At the same time, the appropriate exhaust time and the amount of gas generated during the pumping process must be considered and determined. Check and determine the time required to reach the required vacuum level, the flow resistance of the vacuum pipeline, and leakage. Consider the pumping speed required to maintain the vacuum under certain process conditions after reaching the required vacuum level.

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