Air Cannon CNU-M SERIE
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- Solution for material flow problems.
- Simple, efficient, noiseless and economic.
- Safety for the staff.
- Whole capacity of the deposit is useful.
- Membrane shot as the only moving part.
- System patented.
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Description
The CNU-M air cannon is a system to solve flow problems of bulk materials such as ash, slag,
lime, cement, coal, ore, clay, salts, sawdust, shavings, cuttings, flakes, powder, soya,
livestock…
In a fraction of a second the CNU-M air cannon blasts a volume of pressurised air through a
broad section pipe, until it reaches the critical areas of the silo where the bulk material has
become blocked. This accumulated energy, by being suddenly released, exceeds the
adherence friction, and as a result of the airjet, the blocked material again flows normally by
gravity, with little sliding friction.
The CNU-M air cannon is a safe method, as the valve used does not produce any sparks or
flame. Besides of this, other fluids can be used, as the nitrogen. On the other hand, the
structure does not suffer, as the energy is applied directly to the material. The design reduces
the backward motion to the minimum, avoiding any possibility of stress on the structure.
Applications
The CNU-M air cannon can be used in concrete, steel, wooden or plastic silos, tanks and
hoppers. Any shape, form or inclination can be valid as long as the material to be fed is
blocked.
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Clinging material
The material clings to the wall
structure. |
Bridging
The material tends to form a
bridge in the central area. |
Chimney
Hoppers often become
obstructed with settled material. |
Dome
The material blocks the upper
part of the hopper. |
Functioning
The CNU air cannon works with normal air pressure lines, starting form 2 to 10 kg/cm2. It is
highly recommended that the used air is clean and dry. The effectiveness is increased with
the pressure. Normally a pressure between 2 and 6 kg/cm2 is enough.
The maximum drive frequency allowed to activate the air cannon is 12 shots per minute, even
though a few shots per day are enough under normal conditions.
How the CNU-M air cannon works
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| To fill the accumulation chamber D with air, the airline is
connected through the valve V |
The air presses membrane M against the edges of pipe
T, closing chamber D. D is filled with air through the
holes of the membrane. |
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| The air passing through the holes in the membrane fills
the chamber D until pressure compensation is reached.
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When closing valve V, the air contained in chamber C
leaves through the electric valve, opening
communication between chamber D and pipe T. The air
leaves through T, expanding in the form of an explosion.
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Installation
The 3/4" quick exhaust valve V -included in the scope of the supply- has to be installed in the
outlet of the air cannon. This exhaust valve has to be commanded by another valve, with a
minimum diameter of 3/8".
The air cannon is secured to the tank or hopper with a few accessory pipe elements and is
connected to the air pressure network through a control valve sometimes combined with a full
automatic pneumatic drive circuit.
The control valve can be a 3/2-way valve, a 5/2-way valve; electrically, pneumatically or
manually commanded. It can be connected to the exhaust valve directly or through a rigid tube;
in this case, the minimum tube diameter must be 10 mm and the maximum length of 1,5 m.
  
Construction
The only moving part in the CNU-M air cannon is a membrane accessible from the outside
without dismantling the unit. This membrane gives the air-tightness to the air cannon.
Safety against accidents
CNU air cannons fulfil Council’s Directive concerning pressure vessels 87/404/CEE.
Questionnaire
If needed, a questionnaire is available in order to study the necessary data to determine the
type and the units to be installed on the silo.
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