BS ISO 3529-2:2020 pdf download – Vacuum technology — Vocabulary Part 2: Vacuum pumps and related terms
This document gives definitions of vacuum pumps and related terms. It is a continuation of ISO 3529‑1 which defines general terms used in vacuum technology.
2 Normative references
ISO 3529‑1:2019, Vacuum technology — Vocabulary — Part 1: General terms
ISO 21360‑1:2012, Vacuum technology — Standard methods for measuring vacuum-pump performance —
Part 1: General description
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
3.1 Vacuum pumps
3.1.1
vacuum pump
device for creating, improving and/or maintaining a vacuum
Note 1 to entry: Two basically distinct categories may be considered: gas transfer pumps (3.1.2) and gas gathering vacuum pumps (3.1.32)
Note 2 to entry: Some definitions given in ISO 3529‑1 are repeated in this document in deferent terms to adapt to vacuum pumps.
Note 3 to entry: Vacuum is defined in ISO 3529‑1.
Note 4 to entry: A classification table for vacuum pumps is described in Annex A.
3.1.2
gas transfer vacuum pumps
vacuum pump (3.1.1) that transports gas molecules from the inlet to the outlet (3.2.3) of the vacuum pump by means of positive displacement or transfer of kinetic momentum
3.1.9
liquid ring vacuum pump
rotary positive displacement vacuum pump (3.1.3) in which an eccentric rotor with fixed blades throwsa liquid against the stator wall
Note 1 to entry: The liquid takes the form of a ring concentric to the stator and combines with the rotor blades todefine a varying volume.
3.1.10
external vane vacuum pump
rotary positive displacement vacuum pump (3.1.3) in which a rotor is turning eccentrically in contactwith the internal wall of the stator
Note 1 to entry: A device moving relative to the stator is pressed against the rotor and divides the stator chamberinto parts of varying volume (external vane pump).
3.1.11
rotary piston vacuum pump
rotary positive displacement vacuum pump(3.1.3) in which a rotor is turning eccentrically to the internalwall of the stator
Note 1 to entry: The stator chamber is divided into two parts of varying volume by a bulkhead (piston or plunger)sealed in the stator (piston bearing) and rigidly fixed to the rotor.
Note 2 to entry:Rotary piston vacuum pump also called rotary plunger vacuum pump.3.1.12
trochoid vacuum pump
rotary positive displacement vacuum pump (3.1.3) in which an elliptical piston moves around a shafteccentrically
Note 1 to entry: The case is in continuous non-contact sealing with the piston. Oil is fed for sealing.3.1.13
peristaltic vacuum pump
rotary positive displacement vacuum pump(3.1.3) in which a turning rotor compresses with a number ofrollers or lobes a flexible tube and forcing the gas move through the tube
3.1.14
roots vacuum pump
rotary positive displacement vacuum pump (3.1.3) in which two or three lobed rotors, interlocked andsynchronized, rotate in opposite directions moving past each other and the housing wall with a smallclearance and without touching
Note 1 to entry: Roots vacuum pumps are used as primary — also referred to as mechanical booster vacuumpump -as well as secondary or main vacuum pump.
Note 2 to entry: Roots pumps have per stage no inner compression ratio.3.1.15
screw vacuum pump
rotary positive displacement vacuum pump (3.1.3) comprises opposing synchronously rotating screwswith various profile design like tapered or variable pitch for an inner compression ratio
Note 1 to entry:The screw vacuum pump could have profile design without inner compression ratio too.
3.1.16
claw vacuum pump
rotary positive displacement vacuum pump(3.1.3) in which two claw-shaped rotors, interlocked andsynchronized, rotate in opposite directions moving past each other and the housing wall with a smallclearance and without touching
Note 1 to entry: Claw vacuum pumps are designed with one or more compression stages.3.1.17
kinetic vacuum pump
vacuum pump(3.i.1) in which a gas or gas molecules can be displaced from the pump inlet to the outlet(3.2.3)either mechanically (rotating it at high speed or by providing an impulse in the direction of flow)or by the use of another fluid (providing also an impulse in the direction of flow) or using an electricalpotential to displace gas ions
Note 1 to entry: Three categories can be considered: mechanical kinetic pumps(3.1.18-3.1.22) fluid entrainmentpumps (3.1.23-3.1.30) and ion transfer pumps (3.1.31).
3.1.18
turbine vacuum pump
rotary kinetic vacuum pump (3.1.17) in which the transfer of a large amount of gas is obtained by arapidly rotating device
Note 1 to entry:The dynamic sealing is obtained without rubbing.The gas flow either may be directed parallelto the axis of rotation (axial flow vacuum turbine pump) or at right angles to the axis of rotation (radial flowvacuum turbine pump or centrifugal vacuum pump).BS ISO 3529-2 pdf download.