Filters are used for direct mounting at elevators, conveying machines, batcher and daily capacities in all the valves with small volume of air.
In this section:
Features of local filters
Types of filter mediums for local filters
Operating principle of local filters
Technical characteristics of local filters for vertical mounting
Technical characteristics of local filters for horizontal mounting
Estimated limits (standard equipment)
Local filters are intended for simple installation in any of materials transportation system. In every place appeared dust is effectively collected and returned to process flow, at this insignificant negative pressure is supported in the system. As a result disposal of valuable products, product yield and productivity increase.
Filter is suitable for direct mounting at elevators, conveying machines, batcher and daily capacities in all the valves with small volume of air. It can be used as a component of larger system of dust control for provision of correspondence to all the necessary healthcare regulations and safety measures.
Typical branches where the filters are used:
- Agricultural food branch
- Foodprocessing branch
- Loading and unloading of grain
and many others...
- Robust construction
- Compact sizes
- High performance continuous service
- Tested filtering material
- Construction from stainless steel or low-carbon steel
- It is supplied fully collected for ease of mounting
Checked filtering medium
Two tested types of filtering material are used for provision of high productiveness, continuous cleaning. Range of filtering area is from two square meters up to ten meters.
|Elements from polyester bonded fabric||Cloth filter bags|
The filter consists of two separate versions for vertical and horizontal mounting. Vertical device has inclined batcher for prevention of product stoppage in housing.
There are some options for application of filters in dangerous medias:
- static discharge devices
- ventilator which doesn’t cause sparks
- engines and controllers applied for hazardous areas.
- alternative filtering material
Ability to fully delete dust
- full set for dust control from the smallest up to the biggest volumes of air is offered with filter
- compact valved filters
- inserted filters
- centralized filters for dust removal and vacuum cleaning systems
Demand for compressed air
Independent source of dry compressed air of 3,8 bar is required for dust filters.
Pressure-relief valve (pressure relief)
Collector is provided with safety valve and manometer. Safety valve is preliminarily set at 6.9 bar (100 pounds/inch2 man.). Additional system relief device will be required if volume of air is bigger than nominal of the relief device, this relief device can be supplied on demand of a customer (25 dm3/sec at 6.9 bar).
Air contaminated with dust is supplied to the chamber where there are filtering elements в, air bumps against all the external surfaces. Dust layer is collected outside the elements while air pass through the medium. Clean air comes out of the external collector of every filtering element to the cleaned air chamber of and from there it is issued through the ventilator into the atmosphere.
At regular intervals which are set by controller, every filtering element in turn accepts short stroke of compressed air from corresponding jet pipe. Jet pipe is provided with set of small diameter jet holes which are placed near the external collector of every filtering element. These holes have optimum size and distance from filtering element, in consequence of which large volume of outside air is pushed out by every flow of compressed air. Due to it short powerful reverse blow of air through filtering element is happened, what destroys collected dust layer.
In a similar manner differential pressure at the entire filter is kept at practically constant level what allows to continuously use filter during 24 hours per day.
Local filter for vertical mounting
Local filter for horizontal mounting
Estimated limits (standard equipment)
- Temperature range: –10°С up to +60°С
- Pressure range –200 mm of water up to +200 mm of water
- Tolerance on dimensions: ±5 mm at basis sizes ±2 mm at sizes for details
- Controller: 2-way controller
- Impressed voltage: version of alternating current: 105-120 V 200-240 V ±10%; version of constant current: 24 V
- Ventilator engine (if applied): corresponds to voltage of local network
Noise level of equipment is an important factor at designing and selection of new equipment. Some EU directives and national laws/normative accepting these directives are referred to noise bursts transferred by air. Employers should provide minimum noise level according to the EU standards, at the level of 85 dB (А).
Local filters have average noise indication of 78 dB (А).
All the indications were taken at normal industrial areas, i.e. with semireverberation environments, at non-operated local equipment within a radius of 1,0 meter from house of equipment and at a height of engine shaft with use of precision sound-level meter and octave filter.
Noise levels of the installed equipment can be changed depending on conditions.