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New sizes and designs of the Aerzen blower units
Delta Blower Generation 5 are the new series of blower units made by Aerzener Maschinenfabrik GmbH, introduced for the first time in May last year and already setting a new standard in the market. The innovative series was available in 9 sizes for overpressure applications up to 1000 mbar in nominal widths DN 80 up to DN 200 and intake volume flows of approx. 60 m³/h up to 3.600 m³/h. There is now a new machine type GM 3S-G5 in nominal width DN 50, adding a new blower unit in the lower volume flow range. It covers intake volume flows from 30 m³/h up to 250 m³/h at max. overpressures of up to 900 mbar. Motor ratings 3 kW, 5,5 kW or max. 7,5 kW can be installed.
For the special requirements in the suction-pneumatic conveyance of bulk material the new Delta Blower units Generation 5 were developed as vacuum design with pressures of up to minus 500 mbar. The negative pressure series includes all in all 10 blower sizes with intake volume flows from 30 m³/h up to 3.600 m³/h in nominal widths DN 50 up to DN 200. As with the existing overpressure series the negative pressure design offers five main advantages for customers. These five main advantages that led to the name “Generation 5”.
- Lower sound levels
Sound levels have been reduced by an average of 6-8 dBA and in some cases even more. Consequently costly special measures such as acoustic hoods are no longer required.
- Simple operation and easy maintenance
The new design units are easily transportable by means of a pallet truck or fork lift. The units are delivered with a service pack, including a jack, oil funnel and initial fill of oil to simplify commissioning. All maintenance procedure can be carried out from the front of the unit. The new oil system is a key advantage as the oil level can be viewed and checked from the outside of the unit, even when it is in operation, therefore reducing production shutdowns as well as operating time and costs. Servicing of the smallest size in nominal width DN 50 can easily be carried out from the top through a detachable roof element (due to low height ).
- Mechanical fan
A mechanical fan mounted on the blower drive shaft is used to ventilate the acoustic hood so an electric fan is not required, this saves additional installation and energy costs. A further advantage is that the new units are fully ATEX compliant which means that expensive ex-proof motors are not required and this represents a considerable cost saving for the customer.
- Absorption material eliminated
Because the sound level has been reduced by deflecting the air flow within the silencer there is no need for absorption material in any part of the unit. As absorption material is subject to degradation the downstream system cannot therefore become contaminated when used for pneumatic conveying of bulk food materials. Similarly, sewage aeration systems cannot become blocked and costly maintenance procedures and production losses are eliminated.
- Space saving design
The new units have been designed to use minimal floor space and can even by installed side by side. In addition, the smaller units have been reduced in size allowing savings in the form of smaller installation areas or blower rooms.
Another distinct advantage for the end user is the ATEX solutions of the new Generation 5 blower units made by Aerzener. These blower units for suction and pressure operation are especially designed as per European machine directive 94/9/EG for requirements in categories 2 and 3 for dust as well as for gas zones. They also consider an explosion protection for units as per ATEX-directive 137 (1999/9/29EG). In suction operation in case of a malfunction in the separation filter (e.g. filter damage) it has to be ensured that no combustible dust-air mixture is sucked into the blower. For this reason, as a rule the plant manufacturer has to provide an additional filter element (“emergency filter”). This means additional expenditure for projecting, assembly and installation. Therefore Aerzener Maschinenfabrik GmbH havedeveloped a puncture-proof filter element, integrated in the suction silencer. This filter is monitored by a differential pressure measurement. The special filter element made by Aerzener thus replaces the emergency filter which was necessary up to now.
Further advantages for Delta Blower Generation 5 include compliance with PED guidelines and the standard use of energy efficient EFF1 motors. The base support is also certified as spark resistant for ATEX applications, so eliminating the need for a downstream spark arrester when pneumatically conveying bulk materials with explosive dust. The intake silencer is positioned to draw air from the coolest point to guarantee optimal ventilation of the unit even at critical ambient temperatures.
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