BALMA air compressors manufacturing
Direct drive compressors
The direct drive compressors are
extremely compact in size and are supplied with a plastic cowl which
covers the pump and motor improving the air flow for cooling.
These popular models use a very efficient technical solution whith
also improvies manifacturing costs, marking the compressors more
available to a wider scope of users: they have the electric motor
shaft and pump shaft directly connected avoiding a lot of mecchanical
components and most importantly losses of power that may be caused
by indirect couplings. With direct coupling the other advantage
is that the pump runs at same speed of the motor i.e. 2800 rpm and
produces the optimum supply of air.
Oilless direct drive compressors
The oilless direct drive models do not use any oil in the
sump. They have a particular design that uses special techniques
and special materials with a low coefficient of friction and
very low wear and tear that warrant the long life of the compressor.
Lubrificated direct drive compressors
|In the lubrificated
direct drive models all internal parts are lubrificated using
a splash system:this means that the conrod has a needle in the
lower part which "dips" intothe oil on its descnt
thus splashing it on the walls of the cylinder and the shells
of the conrod which are the parts with highest friction.
The oil creates afilm between moving parts avoiding direct contact
between metal and metal, thus avoiding heat and wear ans retaining
the compressor efficiency.
Belt driven compressors
They have a very long life and are particularly suitable
for heavy duty use . This type of electric compressor uses
the traditional belt driven system which is powered by an
electric motor with a pulley, driving the flywheel on the
The motor pulley always has a smaller diameter that the flywheel
on the pump as the latter also acts as a fan to create a positive
flow of air which coolo the pump during operation.
The trasmition ratio of BALMA compressors allows the pump
to run at low speed, which is able to guarantee optimal levels
of efficiency, lubrification, cooling and long life.
Belt driven compressors are available in single and two stage.
The latter having a much higher efficiency and lower noise
level than the direct drive models.
|The two stage BALMA models are characterized
by aluminium head with large cooling fins and after cooling
for better cooling, cast iron cylinders to guarantee high reliabilty
and long life, larger oil sump for better lubrification, cast
iron shaft dynamically balanced, special stainless steel valves
for higher output and resistance.
|BALMA rotary screw compressors are
supplied with a single stage rotary air end with oil injection
cooling, this comprises of two rotors with a special patented
high efficiency asymmetric profile mounted on six bearings designed
for radial and axial loads.
The specific design of the BALMA "VISS" air end, with
its high volumetric efficiency, allows a higher output with
low power adsorption.
The rotors, separated by a film of oil, rotate at low speed
on the bearings, reducing the wear to the minimum and thus increasing
the life of the air end and that of whole compressor.
All BALMA screw compressors are supplied
|with tree phase asynchronous motor
with motors with IP54 protection, a service factor of 1.15,
a star/deltastarter housed in an IP65 enclosure, controll pannel
and electronic "check control" system, after cooler
and silence cabinet designed for heat recovery.
Before buying an air compressor
it is important to evaluate the following points:
1 Estimate the total requirements of compressed
air for the air tools being used, considering also any future requirements.
2 Assume that the free air delivered is always
at least half the air capacity stated while evaluating the air requirements
of tools and equipment.
3 Air tool air consumption is always
stated as FAD while most air compressor manufactorers show piston
dispacement.As an example to calculate the FAD and displacement
of 60-70% while for a belt driven compressor it can be up to about
We always recommend buyng a compressor which given ample air supply
with reference to the needs