DESC:FIELD OF INVENTION

The present invention relates to air cleaners for internal combustion engines (ICEs). In particular, the present invention relates to a dry air cleaner for ICE of farm equipment and off-road vehicles. More particularly, the present invention relates to an air cleaner based on turbulence effect, which can work both as a dry air cleaner and as a wet air cleaner.

BACKGROUND OF THE INVENTION

An air filter is a device made of a housing accommodating different types of fibrous materials for removing solid particulate matter, e.g. dust, pollen, mould, and bacteria from air to be used in applications where air quality is of utmost importance, particularly in building ventilation systems and in engines.

In particular, paper, foam, or cotton filters are predominantly used in air filters for cleaning intake air of internal combustion engines and air compressors. An internal combustion engine air filter is designed to clean the combustion air generally carrying substantial amounts of abrasive particulate matter before entering the cylinders of the ICE. This is necessary to prevent such harmful particulate matters from causing mechanical wear and oil contamination, once these reach inside the combustion chamber.

Normally, most of the fuel-injected automotive vehicles and farm equipment use a flat paneled pleated paper filter element, which is placed inside a plastic box connected to the throttle body via ductwork.

The overall unit (filter and housing together) is referred to as the air cleaner. It is pertinent to mention that dry air cleaners are suitable for operational environment consisting of air flow with low particulate matter, whereas wet air cleaners are required in harsh operational requirements like thrashing, which have high dust-suspended particulate matter in air to be filtered or cleaned.

However, often a farm equipment or off-road vehicle needs to work in a combination of environment, which require cleaning of air with low to high particulate matter concentrations. The maintenance requirements of these two types of air cleaners vary, e.g. the dry type air cleaners being relatively maintenance-free in comparison to the oil-bath type air cleaners.

PRIOR ART

US3838675 A discloses a combination dry element type air cleaning and purging apparatus is provided for use with an internal combustion engine for the purpose of separating foreign material from the atmospheric air prior to its being introduced into the engine. The apparatus includes an air pump for purging the material which has been separated from the air being filtered without necessitating the removal of any portion of the filtering device or the manual handling of the collected foreign material. The power-driven air pump is operably coupled with the engine in such a manner that it may be selectively actuated during operation of the engine and includes a switch control so that an operator may cause such purging to be accomplished without leaving the operator's station. Vane structure is provided in a dust collector cap portion of the filtering device and causes an air turbulence for increasing the dust transferring capabilities of the airstream to insure removal of substantially all foreign matter from the collector cap during operation of the air pump.

US2299332 A discloses an air cleaner having a body containing a generally frusto-conical chamber, a base member for said chamber with a solid center and an annular vaned inlet, an induction pipe axially positioned in said chamber in such manner that its inner end is shielded by the solid center of the base, and a dust tube normal to the smaller end of the chamber and in communication therewith, the said dust tube embodying a turn portion spaced from the chamber by the tube and a dust receptacle hermetically sealed to the outlet of the said turn portion.

DISADVANTAGES WITH THE PRIOR ART

The following are the main disadvantages with the air filters discussed above:

• Cannot work both as a dry and wet air cleaner,

• Low-efficiency,

• Limited paper element life,

• Requires more number of paper filter elements,

• Dust extraction is difficult.

Therefore, there is an existing need to devise an air cleaner, which can be easily adapted to be configured for working in a mixed environment, consisting of a low to high-particulate matter suspension in air being fed to the combustion chamber of the internal combustion engine, particularly for running a farm equipment or a heavy-duty off-road vehicle.

OBJECTS OF THE INVENTION

Some of the objects of the present invention - satisfied by at least one embodiment of the present invention - are as follows:

An object of the present invention is to provide an air cleaner for internal combustion engines, which works on turbulence effect.

Another object of the present invention is to provide an air cleaner for internal combustion engines, which can be used as a dry as well as wet air cleaner.

Still another object of the present invention is to provide an air cleaner which has a higher efficiency than the conventional air cleaners.

Yet another object of the present invention is to provide an air cleaner for internal combustion engines, which uses a single paper filter.
A still further object of the present invention is to provide an air cleaner for internal combustion engines, which has increased paper element life.

A yet further object of the present invention is to provide an air cleaner for internal combustion engines, which offers an easy dust extraction mechanism.

These and other objects and advantages of the present invention will become more apparent from the following description, when read with the accompanying figures of drawing, which are however not intended to limit the scope of the present invention in any way.

SUMMARY OF THE INVENTION

In accordance with the present invention, there is provided a dry and wet air-cleaner based on the turbulence effect, said air-cleaner comprises:

• an elongated, preferably vertically disposed hollow body with an inlet for air contaminated with dust and particulate matter and an air outlet for clean filtered air;

• a paper filter fitted inside said hollow body;

• an arrangement for mounting said air-cleaner in farm equipment or off-road vehicle;

• a turbulence unit for generating turbulence inside said hollow body; and

• a dust extraction valve, preferably a spring-loaded dust extraction valve fitted on said hollow body;

wherein said hollow body is divided in at least two compartments, the first compartment housing said paper filter and the second compartment housing said turbulence unit as well as said dust extraction valve for separating the dust and particulate matter from said contaminated air.

Typically, the elongated hollow body is disposed vertically and preferably configured cylindrical, and comprises an upper body configured with an inlet pipe for said contaminated air at the top surface thereof and an outlet for cleaned filtered air laterally disposed thereon as well as a lower body housing said air-turbulence unit; and an air-inlet pipe extending through said upper and lower body and connected to said air-turbulence unit.

Typically, the paper filter is housed to surround said air-inlet pipe and is supported on a base centrally disposed over said lower body.

Typically, the arrangement for mounting said air-cleaner comprises a mounting bracket and mounting clamps.

Typically, the air-turbulence unit comprises:

• a substantially cylindrical double-walled construction with an annular base snugly fitted inside said lower body at the bottom end thereof;

• an outer wall thereof configured as a guiding cone tapering inward therefrom and opening at the top around said air-inlet pipe; and

• an inner wall thereof configured cylindrical and tightly fitted over said inlet pipe;

wherein a plurality of profiled fin-plates disposed between said inner and outer walls for creating air-turbulence to separate dust and particulate matter from the contaminated air introduced from the bottom of said air-inlet pipe and entering between said walls.

Typically, the spring-loaded dust extraction valve is configured as a non-return valve and comprises:

• an inner cover tightened at the top thereof;

• an outer cover tightened under said inner cover;

• a T-shaped valve rod centrally disposed between said inner and outer covers;
• a rubber seal disposed under said inner cover and above the T-flange of said valve rod; and

• a spring disposed between said rubber seal and said T-flange;

wherein an aperture is provided in the base of said outer cover to allow atmospheric air to enter and to keep the dust and particular matter collected in the inner cover to fall down intermittently, whenever the weight thereof exceeds the predetermined weight of dust and particulate matter collected therein.

Typically, the spring constant of said spring-loaded dust extraction valve is configured according to the frequency to operate said valve for the collection of said separated dust and particulate matter to be released from said inner cover intermittently.

Typically, the paper filter is configured as a single paper filter of substantially hollow cylindrical shape and housed to surround said air-inlet pipe and supported on a base, preferably a resting plate seated on a V-grooved rubber sealing ring centrally disposed over said lower body.

Typically, the paper filter comprises a plurality of fine perforations at the bottom face thereof for introducing air cleaned after separation of dust and particulate matter by means of said air-turbulence unit.

In accordance with an embodiment of the present invention, there is provided an air-cleaner as claimed in claim 1 and comprising a vertically disposed cylindrical hollow body and having:

• an upper body configured with an inlet pipe for said contaminated air at the top surface thereof and an outlet for cleaned filtered air laterally disposed thereon;

• a lower body housing an air-turbulence unit for generating turbulence inside said hollow body and fitted with a dust extraction valve;

• an air-inlet pipe extending through said upper and lower body and fluidly connected to said air-turbulence unit at the bottom thereof.

• a single hollow cylindrical paper filter housed inside said hollow body, surrounding said air-inlet pipe and supported on a resting plate seated on a V-grooved rubber sealing ring centrally disposed over said lower body;

• a mounting bracket and a plurality of mounting clamps for mounting said air-cleaner in farm equipment or off-road vehicle;

• a turbulence unit for generating turbulence inside said hollow body; and

• a spring-loaded dust extraction valve fitted on said hollow body;

wherein said air-turbulence unit comprises a cylindrical double-walled construction with an annular base snugly fitted inside said lower body at the bottom end thereof; an outer wall thereof configured as a guiding cone tapering inward therefrom and opening at the top around said air-inlet pipe; and an inner wall thereof configured cylindrical and tightly fitted over said inlet pipe; a plurality of profiled fin-plates disposed between said inner and outer walls for creating air-turbulence to separate dust and particulate matter from the contaminated air introduced from the bottom of said air-inlet pipe and entering between said walls; and said spring-loaded dust extraction valve is comprises an inner cover tightened at the top thereof; an outer cover tightened under said inner cover; a T-shaped valve rod centrally disposed between said inner and outer covers; a rubber seal disposed under said inner cover and above the T-flange of said valve rod; and a spring disposed between said rubber seal and said T-flange; an aperture provided in the base of said outer cover to allow atmospheric air to enter and to prevent the dust and particular matter collected in the inner cover from falling down and to allow it to fall down whenever the weight thereof exceeds the predetermined weight of dust and particulate matter collected therein; said predetermined weight being a function of the predefined frequency to operate said valve for the collection of said separated dust and particulate matter to be released from said inner cover intermittently.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The present invention will be briefly described with reference to the accompanying drawings, wherein:

Figure 1 shows a perspective view of the air cleaner for an internal combustion engine used in farm equipment or off-road vehicles.

Figure 2a shows a front view of the air cleaner of Figure 1.

Figure 2b shows a view partially sectioned across section line A-A of Fig. 2a.

Figure 3 shows perspective view of the unit creating a turbulence in the air cleaner of Figure 1.

Figure 4 shows perspective view of the dust extraction valve of the air cleaner of Figure 1.

Figure 5 shows a sectioned view of the dust extraction valve of Figure 4.

DETAILED DESCRIPTION OF THE ACCOMPANYING DRAWINGS

In the following, the air cleaner for an internal combustion engine used in farm equipment or off-road vehicles configured in accordance with the present invention will be described in more details with reference to the accompanying drawings without limiting the scope and ambit of the present invention in any way.

Figure 1 shows a perspective view of the air cleaner for an internal combustion engine used in farm equipment or off-road vehicles. It comprises a CPTE body 10 for an air-cleaner having an inlet pipe 12 for introducing air to be filtered and laden with suspended particulate matter, such as dust, fine waste material etc. It also has an outlet 14 for supplying filtered and cleaned air to the combustion chamber of ICE. The air cleaner assembly mounted on the farm equipment or off-road vehicles by means of a support bracket 15, preferably spot welded a detachable mounting bracket 16. A circular clamping plate 13a is welded to this support bracket 15 for mounting/removing the air-cleaner assembly on/from the farm equipment or off-road vehicles by tightening/loosening fasteners 13b. A CPTE clamp 18 with eyes 17 engages an eye bolt 19 and an air-cleaner CPTE bowl 20 containing a turbulence unit 22 (Figure 3) with a dust separating fin 21 and a dust separating cone 23. A spring-loaded dust extraction valve 30 is fitted, preferably brazed at the bottom of the air-cleaner CPTE bowl 20 to a socket 32 (not shown) provided therein after placing a rubber ‘O’ ring 34. The air cleaner is predominantly cylindrical in shape, however not necessarily limited to this shape.

Figure 2a shows a front view of the air cleaner of Figure 1as described above.

Figure 2b shows a view partially sectioned across section line A-A of Fig. 2a. Here, the turbulence unit 22 has a guiding cone 23, tapering inwards from the bottom plane thereof and an inner annular plate 25. A partially sectioned paper filter 24 is visible mounted over a paper filter resting plate 26 seated on a V-grooved rubber ring 28. A rubber bidding ring 26a is placed between the resting plate 26 and the paper filter 24. Here, the lower body 20 includes a turbulence unit 22 used for separating dust and other particulate matter from the air. It also has a spring-loaded dust extraction valve 30 fitted at the bottom adjacent the periphery thereof. Red arrows indicate heavier dust and particulate matter and yellow arrows indicate lighter dust and particulate matter. Preferably, a circumferential soldered or brazed joint 11 is used for attaching the inlet pipe 12 to body 10. The circular clamping plate 13a is also preferably brazed to the support bracket 15.

Figure 3 shows a perspective view of the turbulence unit 22 for creating a turbulence in the air-particulate matter suspension to be cleaned in the air cleaner of Figure 1. The guiding cone 23 of the turbulence unit 22 tapers inwards from bottom plane thereof and an inner annular plate 25 comprises a plurality of profiled fin-plates 27 for creating turbulence for separating the dust and particulate matter suspension from the contaminated air fed in the air filter.
Figure 4 shows perspective view of a dust extraction valve 30 of the air cleaner of Figure 1.

Figure 5 shows sectioned view of the dust extraction valve 30 of Figure 4. The dust extraction valve 30 works as a non-return valve and contains a total of 5 sub-components, e.g. inner cover 32, outer cover 34, rubber seal 36, spring 38 and valve rod 40. During the suction stroke, the atmospheric air is sucked in the direction of the red arrows and attempts to enter inside the dust extraction valve 30.

However, since the valve rod 40 has a rubber seal 36 on the top thereof, it does not allow this atmospheric air to enter into the filtering unit. When the weight of the dust and particulate matter collected above the rubber seal inside the inner cover is increased, the spring 38 is compressed (spring is suitably configured as per the requirements) to move downwards and the dust comes out and falls in the outer cover 34 before being extracted.

The following are the unique features of the dust extraction valve configured in accordance with the present invention:

• Dust extraction valve 30 is easily removable to be dismantled for cleaning during servicing thereof.

• Construction of valve rod 40 Figure 5 is configured such that in case of any abnormalities, such as choking of the valve, the extended rod needs to be just pulled out and its function starts again and there is no need to remove the complete dust extraction valve.

TESTS CONDUCTED

A pressure-drop test was conducted on the dry air cleaner configured in accordance with the present invention, there result of which are enumerated below:

PRESSURE DRP TEST:

S. No. Flow in % Flow in cubic m per min Flow in cubic feet per min Pressure-drop across orifice in mm of water Pressure-drop across duct with filter ‘x’ in mm Pressure-drop across duct with filter ‘y’ in mm Actual pressure-drop across filter ‘y-x’ in mm
Initial reading ‘H’ Final reading
1 100 2.83 100 81 35.69 116.69 25 256 231
2 80 2.26 80 81 22.84 103.84 21 199 178
3 60 1.70 60 81 12.85 93.85 16 149 133
4 40 1.13 40 81 5.71 86.71 12 111 99
5 20 0.56 20 81 1.42 82.42

It is to be noted that at flow rate of 100 cubic feet / min, the pressure-drop is 231 mm, which is less than the maximum limit of 254.00 mm.

DUST RETAINING EFFICIENCY:

S. No. Flow in % (Q) Flow in cubic ft / min Pressure drop across orifice in mm of water Flow in cubic m / min Test duration in min Dust to be fed
in gm
Initial reading Actual reading Final reading
1 100 100 81 35.69 116.69 2.83 15 37.44
2 20 20 81 1.42 82.42 0.56 15 7.54
3 80 80 81 22.84 103.84 2.26 30 60.06
4 60 60 81 12.85 93.85 1.70 15 22.49
5 20 20 81 1.42 82.42 0.56 15 7.54
6 80 80 81 22.84 103.84 2.26 30 60.06
Total => 195.13 gm

Dust retaining efficiency = Weight of a/c after test (C)-Weight of a/c before test (A)
of a dry air-cleaner Weight of dust fed (B)

x 100,

Air Cleaner Efficiency = 2.6310 – 2.4364 x 100 = 99.72%.
0.19513

Further, a dust holding test was conducted, the results are enumerated below:
DUST HOLDING TEST:

S. No. Pressure Drop Across Orifice in cm of water column Pressure Drop of Air cleaner duct in cm of water column Flow in cubic ft/min Flow in cubic m/min Dust to be added in g
Dust held during efficiency test 195
1 104 27.5 80.27 2.27 250
2 99 28.3 71.01 2.00 200
3 96 29.5 64.82 1.83 200
4 90 30.3 50.21 1.42 150
5 89 31.5 47.34 1.33 135
6 87 36.3 32.51 1.00 135
7 85 41.1 20.68 0.67 135
8 83 47.0 8.85 0.25 135
9 81 50.8 0 0 95
Total => 1630

Here, the initial reading for pressure drop was 81 mm of water column at dust feed rate of 2.0 g/cubic ft/hr. It is important to note there that this dust holding capacity can be further increased by increasing the bowl or bottom height.

WORKING PRINCIPLE OF THE INVENTION

The invention is based on the principle of turbulence effect. The intake air is passed through a separately designed turbulence unit 22 to create a turbulence in the air before its entry into the paper filter.

Figure 2 shows two types of arrows, i.e. red arrows represent heavy dust particles and yellow arrows represent small dust particles. Accordingly, the flow of the dust particles is shown by different coloured arrows. When heavy particles come out of the turbulence unit 22 at the end of the guiding cone 23, these get separated at the end of guiding cone 23 in the direction of flow of the heavy dust particles.

Furthermore, the small particles still move with the turbulent air and they strike on the paper filter resting plate 26 and drop down in the dust collection container (not shown here).

The dust collection container has a dust extraction valve acting as a non-return valve and which also acts as a self-operating valve with spring tension, the spring of can be designed as per the frequency to operate the valve for required dust weight collection. Since the heavy and small dust particles are separated before entering the paper filter, this configuration increases the service life as well as the efficiency of the paper filter.

TECHNICAL ADVANTAGES & ECONOMIC SIGNIFICANCE

Some of the technical advantages of the air cleaner for an internal combustion engine used in farm equipment or off-road vehicles and configured in accordance with the present invention are as under:

• Air cleaner works on turbulence effect.

• Air cleaner can be used both as a dry and wet air cleaner.

• Air cleaner has a higher efficiency than the conventional air cleaners.

• Air cleaner uses a single paper filter.

• Air cleaner has increased paper element life.

• Air cleaner offers an easy dust extraction mechanism.

In the previously detailed description, different features have been summarized for improving the conclusiveness of the representation in one or more examples. However, it should be understood that the above description is merely illustrative, but not limiting under any circumstances. It helps in covering all alternatives, modifications and equivalents of the different features and exemplary embodiments.

The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept. Many other examples are directly and immediately clear to the skilled person because of his/her professional knowledge in view of the above description.

These innumerable changes, variations, modifications, alterations may be made and/or integrations in terms of materials and method used may be devised to configure, manufacture and assemble various constituents, components, subassemblies and assemblies according to their size, shapes, orientations and interrelationships. Therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments.

The exemplary embodiments described in this specification are intended merely to provide an understanding of various manners in which this embodiment may be used and to further enable the skilled person in the relevant art to practice this invention. The description provided herein is purely by way of example and illustration.

Throughout this specification the word “comprise”, or variations such as “comprises” or “comprising”, shall be understood to implies including a described element, integer or method step, or group of elements, integers or method steps, however, does not imply excluding any other element, integer or step, or group of elements, integers or method steps.

In the claims and the description, the terms “containing” and “having” are used as linguistically neutral terminologies for the corresponding terms “comprising”.

The use of the expression “a”, “at least” or “at least one” shall imply using one or more elements or ingredients or quantities, as used in the embodiment of the disclosure in order to achieve one or more of the intended objects or results of the present invention.

Furthermore, the use of the term “one” shall not exclude the plurality of such features and components described.

The numerical values given of various physical parameters, dimensions and quantities are only approximate values and it is envisaged that the values higher or lower than the numerical value assigned to the physical parameters, dimensions and quantities fall within the scope of the disclosure unless there is a statement in the specification to the contrary.

Also, any reference herein to the terms ‘left’ or ‘right, ‘up’ or ‘down, or ‘top’ or ‘bottom’ are used as a matter of mere convenience and are determined by standing at the rear of the machine facing in its normal direction of travel.

The various features and advantageous details are explained with reference to the non-limiting embodiment/s in the above description in accordance with the present invention. The descriptions of well-known components and manufacturing and processing techniques are consciously omitted in this specification, so as not to unnecessarily obscure the specification.

Furthermore, the various components shown or described herein for any specific application of this invention can be widely known or used in the art by persons skilled in the art and each will likewise not therefore be discussed in significant detail. When referring to the figures, like parts are numbered the same in all of the figures. ,CLAIMS:We claim:

1. A dry and wet air-cleaner based on the turbulence effect, said air-cleaner comprises:

• an elongated, preferably vertically disposed hollow body with an inlet for air contaminated with dust and particulate matter and an air outlet for clean filtered air;

• a paper filter fitted inside said hollow body;

• an arrangement for mounting said air-cleaner in farm equipment or off-road vehicle;

• a turbulence unit for generating turbulence inside said hollow body; and

• a dust extraction valve, preferably a spring-loaded dust extraction valve fitted on said hollow body;

wherein said hollow body is divided in at least two compartments, the first compartment housing said paper filter and the second compartment housing said turbulence unit as well as said dust extraction valve for separating the dust and particulate matter from said contaminated air.

2. Air-cleaner as claimed in claim 1, wherein said elongated hollow body is disposed vertically and preferably configured cylindrical, and comprises an upper body configured with an inlet pipe for said contaminated air at the top surface thereof and an outlet for cleaned filtered air laterally disposed thereon as well as a lower body housing said air-turbulence unit; and an air-inlet pipe extending through said upper and lower body and connected to said air-turbulence unit.

3. Air-cleaner as claimed in claim 2, wherein said paper filter is housed to surround said air-inlet pipe and is supported on a base centrally disposed over said lower body.

4. Air-cleaner as claimed in claim 1, wherein said arrangement for mounting said air-cleaner comprises a mounting bracket and mounting clamps.

5. Air-cleaner as claimed in claim 2, wherein said air-turbulence unit comprising:

• a substantially cylindrical double-walled construction with an annular base snugly fitted inside said lower body at the bottom end thereof;

• an outer wall thereof configured as a guiding cone tapering inward therefrom and opening at the top around said air-inlet pipe; and

• an inner wall thereof configured cylindrical and tightly fitted over said inlet pipe;

wherein a plurality of profiled fin-plates disposed between said inner and outer walls for creating air-turbulence to separate dust and particulate matter from the contaminated air introduced from the bottom of said air-inlet pipe and entering between said walls.

6. Air-cleaner as claimed in claim 2, wherein said spring-loaded dust extraction valve is configured as a non-return valve and comprises:

• an inner cover tightened at the top thereof;

• an outer cover tightened under said inner cover;

• a T-shaped valve rod centrally disposed between said inner and outer covers;

• a rubber seal disposed under said inner cover and above the T-flange of said valve rod; and

• a spring disposed between said rubber seal and said T-flange;

wherein an aperture is provided in the base of said outer cover to allow atmospheric air to enter and to keep the dust and particular matter collected in the inner cover to fall down intermittently, whenever the weight thereof exceeds the predetermined weight of dust and particulate matter collected therein.
7. Air-cleaner as claimed in claim 6, wherein the spring constant of said spring-loaded dust extraction valve is configured according to the frequency to operate said valve for the collection of said separated dust and particulate matter to be released from said inner cover intermittently.

8. Air-cleaner as claimed in claim 1, wherein said paper filter is configured as a single paper filter of substantially hollow cylindrical shape and housed to surround said air-inlet pipe and supported on a base, preferably a resting plate seated on a V-grooved rubber sealing ring centrally disposed over said lower body.

9. Air-cleaner as claimed in claim 8, wherein said paper filter comprises a plurality of fine perforations at the bottom face thereof for introducing air cleaned after separation of dust and particulate matter by means of said air-turbulence unit.

10. An air-cleaner as claimed in claim 1, wherein said air-cleaner comprising a vertically disposed cylindrical hollow body and having:

• an upper body configured with an inlet pipe for said contaminated air at the top surface thereof and an outlet for cleaned filtered air laterally disposed thereon;

• a lower body housing an air-turbulence unit for generating turbulence inside said hollow body and fitted with a dust extraction valve;

• an air-inlet pipe extending through said upper and lower body and fluidly connected to said air-turbulence unit at the bottom thereof.

• a single hollow cylindrical paper filter housed inside said hollow body, surrounding said air-inlet pipe and supported on a resting plate seated on a V-grooved rubber sealing ring centrally disposed over said lower body;

• a mounting bracket and a plurality of mounting clamps for mounting said air-cleaner in farm equipment or off-road vehicle;

• a turbulence unit for generating turbulence inside said hollow body; and
• a spring-loaded dust extraction valve fitted on said hollow body;

wherein said air-turbulence unit comprises a cylindrical double-walled construction with an annular base snugly fitted inside said lower body at the bottom end thereof; an outer wall thereof configured as a guiding cone tapering inward therefrom and opening at the top around said air-inlet pipe; and an inner wall thereof configured cylindrical and tightly fitted over said inlet pipe; a plurality of profiled fin-plates disposed between said inner and outer walls for creating air-turbulence to separate dust and particulate matter from the contaminated air introduced from the bottom of said air-inlet pipe and entering between said walls; and said spring-loaded dust extraction valve is comprises an inner cover tightened at the top thereof; an outer cover tightened under said inner cover; a T-shaped valve rod centrally disposed between said inner and outer covers; a rubber seal disposed under said inner cover and above the T-flange of said valve rod; and a spring disposed between said rubber seal and said T-flange; an aperture provided in the base of said outer cover to allow atmospheric air to enter and to prevent the dust and particular matter collected in the inner cover from falling down and to allow it to fall down whenever the weight thereof exceeds the predetermined weight of dust and particulate matter collected therein; said predetermined weight being a function of the predefined frequency to operate said valve for the collection of said separated dust and particulate matter to be released from said inner cover intermittently.
Digitally Signed.

Dated this 31st day of January 2017. (SANJAY KESHARWANI)
APPLICANT’S PATENT AGENT