Natural perfection: Delta Screw Generation 5
New compressor units made by Aerzener Maschinenfabrik GmbH
30/04/2008
Delta Screw Generation 5 is the new series of screw compressor units made by Aerzener Maschinenfabrik GmbH. This is the synthesis of the known and successful characteristics of the previous generation with technical innovations.
Aerzener Maschinenfabrik was one of the first compressor manufacturers to design compact units and has developed this machine type continuously ever since. Delta Screw Generation 5 is therefore already the 5th generation of Aerzen compressor units and represents the successful combination of tradition and innovation.
The considerable experience in manufacturing oil-free compressors guarantees high-quality and extremely reliable compressor units.
However compared to other compressor models this new series offers five main advantages for the customers. Five main advantages that led to the name "Generation 5".
The Aerzen screw compressors distinguish themselves by two different rotor profiles, which is a criterion which is so far unique on the market for screw compressors.
For low-pressure applications up to 2 bar a specially designed 3 + 4-profile (VML-compressors), for higher pressures up to 3,5 bar a 4 + 6-profile (VM-compressors) is available.
Therefore, depending on the individual case and pressure range the energetically optimal compressor type is available. The energy efficiency increases furthermore by two different pressure outlets per rotor profile; the arrangement depends on pressure and volume flow for an optimum of internal compression. The different internal pressure ratios avoid possible overcompressions and the efficiency of the machines increases. So, e.g. in the low pressure range up to 2 bar an energetic advantage of more than 20% compared with other compressor models may result.
Furthermore the accessory components of the compressor units have been revised technically. Due to innovations in the discharge pressure silencing, pressure losses have been reduced by up to 20%.
In addition, only motors of the energy efficient class EFF1 are used as standard. From this result further saving potentials depending on size are available of up to 3 %. As two thirds of the life cycle costs of compressors are determined by the energy consumption the investment costs, when deciding for an Aerzen compressor unit, already pay off after a short time.
Moreover, compared to the previous generation the sound level of the new series Delta Screw Generation 5 has been reduced considerably, on the average by about 6 dB(A) and in individual cases even more. Beyond that special attention was given to the fact that absorption material within the silencer elements is no longer necessary and therefore not used. Thanks to the considerable sound reductions, costly special measures (such as e.g. special acoustic hoods) are in most cases no longer needed.
A further distinct advantage for the end user is the ATEX-certification as spark arrester. The translation of the European machine directive 94/9/EG for explosion-hazardous areas is becoming more and more important in all branches and ranges of application. The compressor units made by Aerzener are especially designed for the requirements in categories 2 and 3 for dust as well as gas zones and certified accordingly.
In addition, the new units Delta Screw Generation 5 distinguish themselves by a special solution for explosion protection in pneumatic conveying of bulk material. If combustible bulk material is conveyed pneumatically in the unit then in the case of certain dust-air concentrations inflammable mixtures may develop. On the basis of the EU-directive 1999/92/EG (ATEX 137) therefore an additional protection e.g. by means of an external spark arrester in connection with compressors is to be provided. At this point starts the innovative solution of Aerzener Maschinenfabrik:
The newly designed discharge silencer of the Aerzen compressor units is free from absorption material, the sound is dampened only by means of air-redirections. In expensive and practical tests this silencer has now been certified additionally as a spark arrester. External spark arresters are no longer necessary! Besides increasing safety this means costs are saved and pressure and energy losses are reduced considerably.
Furthermore the new compressor units Delta Screw Generation 5 distinguish themselves by their very compact construction. It is possible to install units "Side-by-Side", i.e. the units can be installed directly one beside the other, without any disadvantages for service and maintenance. The reduction of space can therefore lead to savings with smaller machine rooms.
During development of the new units special consideration was given to the ease of handling of the machines and reducing maintenance expenditure. Easy handling starts with easy installation: The new design units can be easily transported at site, by means of a four wheel pallet truck and/or fork lift trucks. An integrated service package incl. jack, funnel and initial oil filling simplify the commissioning as well as further service tasks.
The units are operated from the front. All components requiring maintenance are easily accessible. One of the most important advantages is the new oil system. The oil level can be viewed and checked from the outside of the unit while it is still in operation without any problems. Therefore, compressor shutdowns, process and production interruptions belong to the past.
The patented drive concept with belt drive also leads to a reduction of the maintenance expenditure and thus reduction of the life cycle costs. Aerzen have designed the drive motor to be installed on a hinged motor mounting plate and its own weight always arranges for optimal belt tension.
Retensioning – even after a longer period of operation – is no longer necessary. In addition this new concept makes supplementary adjusting of the performance data possible in case of new requirements (pressure/volume flow) by means of easy and favourable-priced changing of the pulleys.
Further advantages of the new series Delta Screw Generation 5 are that absorption material has not been used for sound dampening (ensuring foodstuff compatibility!) and the use of a mechanical fan as well as class 0-certification for the oil-free unit.
The Delta Screw Generation 5 is currently available as belt-driven design for overpressure, negative pressure and nitrogen applications in nominal widths DN 125 up to DN 200.
A flexible modular construction makes it possible, that within a range of nominal widths all compressor and motor sizes in question for belt drive can be installed. Consequently an optimal adjustment to the corresponding performance requirement or later modifications that become necessary are possible without problems.
For the new series Generation 5 seven sizes are available for intake volume flows from about 270 m³/h up to 2.600 m³/h and overpressures up to 3,5 bar. In vacuum operation VML compressors can be used up to 70% vacuum (0,3 bar abs.), as special design up to 85% vacuum (0,15 bar abs.).
With this individual and innovative concept of the new series Delta Screw Generation 5 Aerzener Maschinenfabrik GmbH has reached a development goal that is already translating the future market requirements successfully.
If you need further information please contact our UK sales office on +44 208 5028100 or at sales@aerzen.co.uk
For more information please contact:Michael KeenanTechnical Sales Manager
phone: +44 208 502 8100fax: +44 208 502 8102sales@aerzen.co.uk
AERZEN MACHINES LTD.
Aerzen House, Langston Road
Loughton / Essex / IG10 3SL
United Kingdom
www.aerzen.co.uk