FORM 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003
COMPETE SPECIFICATION
(See Section 10 and Rule 13)
SELF-CLEANING AIR FILTER SYSTEM
FLEETGUARD FILTERS PRIVATE LIMITED
An Indian Company having registered address at: 136, Park Marina Road, Baner, Pune - 411 045, MH, India
THE FOLLOWING SPECIFICATION PARTICULARLY DESCRIBES THE INVENTION AND THE MANNER IN WHICH IT IS TO BE PERFORMED.

TECHNICAL FIELD
[0001] The present disclosure relates generally to an air filter system for a vehicle, and more specifically to a self-cleaning air filter system for the vehicle.
BACKGROUND
[0002] Air filter systems are the backbone of air intake systems of internal combustion engines. The most essential role of the air filter system is to sustainably provide clean air for efficient combustion inside the internal combustion engine. This requires regular cleaning of the filters of the air filter system for efficient and sustainable performance. This requirement has led to multitude of innovations related to self-cleaning air filter systems. Self-cleaning air filter systems regularly and continuously clean the filter membrane so as to avoid clogging during regular usage.
[0003] Typically, a variety of methods have been used to regularly clean the air filter systems. Pneumatic shaking, mechanical shaking etc. are some of the methods used in the past for self- cleaning the air filter systems. Apart from the commonality of methods used in the self-cleaning, the air filter systems use a variety of designs to make it simpler, easy to assemble, having ease of maintenance, and perfectly suited for the purpose it is designed. Simpler or complicated designs follow from the required clean air flow, ease of self-cleaning, and the process for which the air filter systems have to be deployed. Each time, this balancing act between available choices and process requirements has led to evolution of a specific design for every specific process environment.
[0004] The design choices to enable this balancing act might include choosing a compact design, balancing performance issues with compact

designs, and ease of collecting and disposing-off the collected dust, etc. For example, ease of collecting and disposing-off the collected dust may be a very pertinent factor when a compact design has to be chosen due to restricted space for the air filter system and it has to maintain the required air flow. Earlier designs from the art use a separate dust-suction corridor included apart from the regular input and output, making the design bulky and costlier. Similar earlier designs have utilised centrifugal fans for sucking the collected dust, making designs poor in maintenance owing to the large fan sizes and complicated integration of the fans with the overall design of the filter system.
[0005] Now moving on to the methods for air-cleaning, pneumatic
shaking/cleaning has slowly surpassed the mechanical shaking
technology as it tends to simplify the general design philosophy and
generally enables better integration. Till now, pneumatic
shaking/cleaning has included redirecting the air from the input, using a centrifugal fan positioned axially in-line with the dust output, using an additional pump for creating suction, using a pneumatic tank storing pressurised air and delivering it to nozzles, and redirecting the clean air from the output, etc. The criterion for choosing any one of these methods needs sufficient space for integrating the pneumatic shaking/cleaning apparatus with the rest of the air filter system. Primarily due to this reason, prior arts have used specifically designed air filter systems with self-cleaning mechanism suited for a particular purpose instead of designing it generally. Thus, there is a need for a self-cleaning air filter system which may use pneumatic shaking for successfully removing dust-laden air without needing lots of space or compromising on overall efficiency in continuous operation. [0006] The present invention deals with a specific design of self-cleaning

air filter system balancing the above-mentioned factors and provides an improved and alternative embodiment ensuring simple and efficient design, better integration with rest of the vehicle, ease of collecting dust and disposing-off the collected dust, ease of assembly and maintenance. The present invention further provides an efficient self-cleaning air filter system with integrated components for saving space.
SUMMARY [0007] Embodiments of the present disclosure present technological improvements as solutions to one or more of the above-mentioned technical problems recognized by the inventor in conventional systems.
[0008] In an aspect of the present disclosure, a self-cleaning air filter system is provided. The air filter system comprises an housing, a filter element placed axially inside the housing, a plurality of nozzles coupled to the housing, an air inlet pipe placed axially at the bottom of the housing, an air outlet pipe, and a valve. The plurality of nozzles surround the filter element and are connected to an air source supplying compressed air. The air inlet pipe comprises a suction pipe integrated inside the air inlet pipe and having a first end and a second end. The first end is placed axially near the top of the air inlet pipe and the second end is placed after a bend. The bend enables tangential exit of the suction pipe from the air inlet pipe. The air outlet pipe is placed axially at the top of the housing. The valve allows incoming airflow through the air inlet pipe when in open position and allows dust-laden air flow to be sucked through the suction pipe when in closed position.
[0009] According to aspects of the present disclosure, a method of cleaning a self-cleaning air filter system is provided. The self-cleaning air filter

system comprises a filter element placed axially inside an housing and is surrounded by a plurality of nozzles capable of supplying compressed air. The air inlet pipe is placed axially at the bottom of the housing. The air inlet pipe comprises a suction pipe integrated inside the air inlet pipe. The suction pipe is integrated inside the air inlet pipe and has a first end and a second end. The first end is placed axially near the top of the air inlet pipe and the second end is placed after a bend. The bend enables tangential exit of the suction pipe from the air inlet pipe. The valve allows incoming airflow through the air inlet pipe when in open position and allows dust-laden air flow to be sucked through the suction pipe when in closed position. The method comprises a step of supplying compressed air to the plurality of nozzles for pneumatically shaking the filtered dust trapped in the filter element. The method comprises another step of providing a suction source at the second end of the suction pipe. The method comprises another step of sucking the dust- laden air through the suction pipe.
[0010] Additional aspects, advantages, features and objects of the present disclosure would be made apparent from the drawings and the detailed description of the illustrative embodiments.
[0011] It will be appreciated that features of the present disclosure are susceptible to being combined in various combinations without departing from the scope of the present disclosure as defined by the below mentioned detailed description and drawings.
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0012] The summary above, as well as the following detailed description

of illustrative embodiments, is better understood when read in conjunction with the appended drawings. For the purpose of illustrating the present disclosure, example constructions of the disclosure are shown in the drawings. However, the present disclosure is not limited to specific methods and instrumentalities disclosed herein. Moreover, those in the art will understand that the drawings are not to scale. Wherever possible, like elements have been indicated by identical numbers.
[0013] Embodiments of the present disclosure will now be described, by way of example only, with reference to the following diagrams wherein:
Fig. 1 is a front cross-sectional view depicting general layout of a self-cleaning air filter system, in accordance with an exemplary embodiment of the present disclosure;
Fig. 2 is the front cross-sectional view depicting general working of the self-cleaning air filter system of Fig. 1, in accordance with an exemplary embodiment of the present disclosure;
Fig. 3 illustrates the front cross-sectional view showing collection of dust using pneumatic shaking of the self-cleaning air filter system of Fig. 1, in accordance with an exemplary embodiment of the present disclosure;
Fig. 4 is a front cross-sectional view depicting another general layout of a self-cleaning air filter system, in accordance with another exemplary embodiment of the present disclosure;
Fig. 5 illustrates the front cross-sectional view depicting general working of the self-cleaning air filter system of Fig. 4, in accordance with another

exemplary embodiment of the present disclosure;
Fig. 6 depicts the front cross-sectional view showing collection of dust using pneumatic shaking of the self-cleaning air filter system of Fig. 4, in accordance with another exemplary embodiment of the present disclosure;
Fig. 7 illustrates a method of operation of the self-cleaning air filter system in filtration mode, in accordance with an exemplary embodiment of the present disclosure; and
Fig. 8 illustrates a method of operation of the self-cleaning air filter system in cleaning mode, in accordance with an exemplary embodiment of the present disclosure.
[0014] In the accompanying drawings, an underlined number is employed to represent an item over which the underlined number is positioned or an item to which the underlined number is adjacent. A non-underlined number relates to an item identified by a line linking the non- underlined number to the item. When a number is non-underlined and accompanied by an associated arrow, the non-underlined number is used to identify a general item at which the arrow is pointing.
DETAILED DESCRIPTION OF EMBODIMENTS
[0015] The following detailed description illustrates embodiments of the present disclosure and manners by which they can be implemented. Although some modes of carrying out the present disclosure has been disclosed, those skilled in the art would recognize that other embodiments

for carrying out or practicing the present disclosure are also possible. The person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure. It should be understood that this invention is not limited to the particular methodology, protocols, and the like, described herein and as such may vary. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention, which is defined solely by the claims.
[0016] Unless stated otherwise, or implicit from context, the following terms and phrases include the meanings provided below. Unless explicitly stated otherwise, or apparent from context, the terms and phrases below do not exclude the meaning that the term or phrase has acquired in the art to which it pertains. The definitions are provided to aid in describing particular embodiments of the aspects described herein, and are not intended to limit the claimed invention, because the scope of the invention is limited only by the claims. Further, unless otherwise required by context, singular terms shall include pluralities and plural terms shall include the singular.
[0017] As used herein, the term “comprising” or “comprises” is used in reference to compositions, methods, and respective component(s) thereof, that are essential to the invention, yet open to the inclusion of unspecified elements, whether essential or not.
[0018] The singular terms “a”, “an”, and “the” include plural references unless the context clearly indicates otherwise. Similarly, the word “or” is intended to include “and” unless the context clearly indicates otherwise. Thus, for example, references to the “method” includes one or more

methods, and/or steps of the type described herein, and/or which will become apparent to those persons skilled in the art upon reading this disclosure and so forth.
[0019] Although methods and materials similar or equivalent to those described herein can be used in the practice or testing of this disclosure, suitable methods and materials are described below. The term “comprises” means “includes”. The abbreviation, “e.g.” is derived from the Latin exempli gratia and is used herein to indicate a non-limiting example. Thus, the abbreviation “e.g.” is synonymous with the term “for example”.
[0020] In an aspect of the present disclosure, a self-cleaning air filter system is provided. The air filter system comprises a housing, a filter element placed axially inside the housing, a plurality of nozzles coupled to the housing, an air inlet pipe placed axially at the bottom of the housing; the air inlet pipe having a top end and a bottom end, an air outlet pipe, and a valve. The plurality of nozzles surround the filter element and are connected to an air source supplying compressed air. The air inlet pipe comprises a suction pipe integrated inside the air inlet pipe and having a first end and a second end. The first end is of the suction pipe is located axially near the top of the air inlet pipe and the second end is placed after a bend. The bend enables tangential exit of the suction pipe from the air inlet pipe. The air outlet pipe is placed axially at the top of the housing. The valve allows incoming airflow through the air inlet pipe when in open position and allows dust-laden air flow to be sucked through the suction pipe when in closed position.
[0021] According to aspects of the present disclosure, a self-cleaning air

filter system is provided. The self-cleaning air filter system comprises a filter element placed axially inside a housing and is surrounded by a plurality of nozzles capable of supplying compressed air. The housing has an open top end and an open bottom end such that an air inlet pipe is placed axially at the bottom end of the housing and an outlet is placed axially at the top end of the housing. The air inlet pipe comprises a suction pipe integrated inside the air inlet pipe. The suction pipe is integrated inside the air inlet pipe and has a first end and a second end. The first end is placed axially near a top of the air inlet pipe and the second end is placed after a bend. The bend enables tangential exit of the suction pipe from the air inlet pipe. A valve is placed between the first end of the suction pipe and the top end of the air inlet pipe such that air can pass only through one of the two openings at any given instance. The valve allows incoming airflow through the air inlet pipe when in open position and allows dust-laden air flow to be sucked through the suction pipe when in closed position. The plurality of nozzles is used for supplying compressed air onto the filter element for pneumatically shaking the filtered dust trapped in the filter element. The systems further provides a suction source at the second end of the suction pipe for sucking the dust-laden air through the suction pipe.
[0022] Embodiments of the present disclosure substantially eliminate, or at least partially address, problems in the prior art, and assist the air filter manufacturers, consumers, and suppliers.
[0023] Referring now to the drawings, particularly by their reference numbers, Fig. 1 illustrates a front cross-sectional view depicting a self-cleaning air filter system 100, in accordance with an embodiment of the

present disclosure. The self-cleaning air filter system 100 includes a housing 102, a filter element 104, a plurality of nozzles 106, an air inlet pipe 108, an air outlet pipe 110, and a valve 112. As may be seen, the housing 102 has a top end and a bottom end such that the air inlet pipe 108 is placed axially at the bottom end and the air outlet pipe 110 is placed axially at the top end. The housing 102 further encloses the filter element 104, such that the filter element is surrounded externally by a plurality of nozzles 106 coupled along an inner peripheral surface of the housing 102. In an embodiment of the present disclosure, the filter element 104 is an inside-out flow filter element wherein dirty air enters inside axially and clean air emerges after being filtered.
[0024] As may be further seen, the plurality of nozzles 106 are coupled to the housing 102. The plurality of nozzles 106 surround the filter element 104 and are connected to an air source 114, according to aspects of the present disclosure. The air source 114 supplies compressed air to the plurality of nozzles 106. In aspects of the present disclosure, supply of compressed air from the air source 114 is controlled based on a status of dust clogging the filter element 104. The air source 114 includes an air tank (not shown), according to various aspects of the present disclosure.
[0025] Again referring to Fig. 1, the air inlet pipe 108 includes a suction pipe 116. The suction pipe 116 is integrated inside the air inlet pipe 108, according to embodiments of the present disclosure. In aspects of the present disclosure, the suction pipe 116 includes a first end 118 and a second end 120. The first end 118 is placed axially near the top of the air inlet pipe 108, according to embodiments of the present disclosure. As may be seen clearly, the suction pipe 116 includes a bend 122 after which the suction pipe 116 tangentially exits the air inlet pipe 108. According to

aspects of the present disclosure, the second end 120 of the suction pipe 116 is placed after the bend 122. A suction source 124 is provided after the bend 122 at the second end 120 of the suction pipe 116, according to embodiments of the present disclosure. The suction source 124 maybe a motor capable of creating a potent suction force inside the filter element 104, according to various embodiments of the present disclosure.
[0026] The air inlet pipe 108 and the air outlet pipe 110 are axially placed with respect to the housing 102, according to aspects of the present disclosure. The air inlet pipe 108 is placed axially at the bottom of the housing 102 and the air outlet pipe 110 is placed axially at the top of the housing 102, according to embodiments of the present disclosure.
[0027] Again referring to Fig. 1, the valve 112 allows incoming airflow through the air inlet pipe 108 when in an open position and allows dust-laden air flow to be sucked through the suction pipe 116 when in closed position, according to embodiments of the present disclosure. As may be seen in Fig. 1, the valve 112 is positioned between the air inlet pipe 108 and the suction pipe 116 at the first end 118. According to embodiments of the present disclosure, the valve 112 is a self-operated valve being operated according to the direction of flow of air inside the filter element 104.
[0028] Fig. 1 is merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0029] Fig. 2 depicts the front cross-sectional view depicting general working of the self- cleaning air filter system 100 of Fig. 1. As illustrated in

the view, incoming air is let inside the air inlet pipe 108. As may be seen, the valve 112 is open and the incoming air axially enters the filter element 104. The incoming air gets filtered as it passes through walls of the filter element 104 and the filtered clean air exits the air outlet pipe 110, according to aspects of the present disclosure.
[0030] Fig. 2 is merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0031] Moving on to Fig. 3, the front cross-sectional view showing collection of dust using pneumatic shaking of the self-cleaning air filter system 100 of Fig. 1 is illustrated. As shown, the valve 112 is closed and so the dislodged dust enters the suction pipe 116 through the first 118. The plurality of nozzles 106 are operated, meaning supply of compressed air is provided from the air source 114, according to embodiments of the present disclosure. The supply of compressed air is in a pulsed manner, according to another embodiment of the present disclosure.
[0032] Again referring to Fig. 3, supply of compressed air from the plurality of nozzles 106 causes the filtered dust trapped in the filter element 104 to be dislodged by pneumatic shaking. As the filtered dust is dislodged, the suction source 124 is switched on and the dislodged dust gets sucked through the suction pipe 116 and out of the filter element 104, according to an embodiments of the present disclosure. In aspects of the present disclosure, a dust collecting space (not shown) may be integrated with the suction source 124 for collecting the sucked dust.
[0033] Fig. 3 is merely an example. A person skilled in the art will recognize

many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0034] Now referring to Fig. 4, a front cross-sectional view depicting a self-cleaning air filter system 100 is illustrated, in accordance with another exemplary embodiment of the present disclosure. As depicted, same numerals are used to depict the common parts from Fig. 1.
[0035] The self-cleaning air filter system 100 includes the housing 102, the filter element 104, the plurality of nozzles 106, the air inlet pipe 108, the air outlet pipe 110, and a valve 400. As may be seen, the housing 102 has a top end and a bottom end such that the air inlet pipe 108 is placed axially at the bottom end and the air outlet pipe 110 is placed axially at the top end. The housing 102 further encloses the filter element 104, such that the filter element is surrounded externally by a plurality of nozzles 106 coupled along an inner peripheral surface of the housing 102.In embodiments of the present disclosure, the filter element 104 is an inside-out flow filter element wherein dirty air enters inside axially and clean air emerges after being filtered.
[0036] As may be further seen, the plurality of nozzles 106 are coupled to the housing 102. The plurality of nozzles 106 surround the filter element 104 and are connected to the air source 114, according to aspects of the present disclosure. The air source 114 supplies compressed air to the plurality of nozzles 106. In aspects of the present disclosure, supply of compressed air from the air source 114 is controlled based on a status of dust clogging the filter element 104. The air source 114 includes an air tank (not shown), according to various aspects of the present disclosure.

[0037] Again referring to Fig. 4, the air inlet pipe 108 includes the suction pipe 116. The suction pipe 116 is integrated inside the air inlet pipe 108, according to embodiments of the present disclosure. In aspects of the present disclosure, the suction pipe 116 includes the first end 118 and the second end 120. The first end 118 is placed axially near the top of the air inlet pipe 108, according to embodiments of the present disclosure. As may be seen clearly, the suction pipe 116 includes the bend 122 after which the suction pipe 116 tangentially exits the air inlet pipe 108. According to aspects of the present disclosure, the second end 120 of the suction pipe 116 is placed after the bend 122. The suction source 124 is provided after the bend 122 at the second end 120 of the suction pipe 116, according to embodiments of the present disclosure. The suction source 124 is a motor capable of creating a potent suction force inside the filter element 104, according to various embodiments of the present disclosure.
[0038] The air inlet pipe 108 and the air outlet pipe 110 are axially placed with respect to the housing 102, according to aspects of the present disclosure. The air inlet pipe 108 is placed axially at the bottom of the housing 102 and the air outlet pipe 110 is placed axially at the top of the housing 102, according to embodiments of the present disclosure.
[0039] Again referring to Fig. 4, the valve 400 allows incoming airflow through the air inlet pipe 108 when in an open position and allows dust-laden air flow to be sucked through the suction pipe 116 when in closed position, according to embodiments of the present disclosure. As may be seen in Fig. 4, the first end 118 of the suction pipe 116 is axially merged with the top of the air inlet pipe 108 and the valve 400 is positioned at the bend 122. According to embodiments of the present disclosure, the valve 400 is a self-operated valve being operated according to the direction of

flow of air inside the filter element 104.
[0040] Fig. 4 is merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0041] Moving on to Fig. 5, depicts the front cross-sectional view depicting general working of the self-cleaning air filter system 100 of Fig. 1. As illustrated in the view, incoming air is let inside the air inlet pipe 108. As may be seen, the valve 400 is open and the incoming air axially enters the filter element 104. The incoming air gets filtered as it passes through walls of the filter element 104 and the filtered clean air exits the air outlet pipe 110, according to aspects of the present disclosure.
[0042] Fig. 5 is merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0043] Moving on to Fig. 6, the front cross-sectional view showing collection of dust using pneumatic shaking of the self-cleaning air filter system 100 of Fig. 4 is illustrated. As shown, the valve 400 is closed to allow the passage of dislodged dust from the first end 118 into the suction pipe 116 for evacuation from the self-cleaning air filter system 100. The plurality of nozzles 106 are operated, ensuring supply of compressed air is provided from the air source 114, according to embodiments of the present disclosure. The supply of compressed air is in a pulsed manner, according to another embodiment of the present disclosure.

[0044] Again referring to Fig. 6, supply of compressed air from the plurality of nozzles 106 causes the filtered dust trapped in the filter element 104 to be dislodged by pneumatic shaking. As the filtered dust is dislodged, the suction source 124 is switched on and the dislodged dust gets sucked through the suction pipe 116 and out of the filter element 104, according to embodiments of the present disclosure. In aspects of the present disclosure, a dust collecting space (not shown) may be integrated with the suction source 124 for collecting the sucked dust.
[0045] Fig. 6 is merely an example. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0046] The self-cleaning air filters system 100 of the present invention operates in a self-cleaning mode and a filtration mode in a cyclic manner so as to ensure continuous operation of the system 100. Now, referring to Fig. 7, a process for operation in filtration mode 700 of the self-cleaning air filter system 100 is illustrated. The process 700 comprises a first step 702 allowing the passage of incoming air through the air inlet pipe 108. The process 700 further comprises a second step 704 wherein the incoming air pushes valve 112 to allow the passage of air from the air inlet pipe 108 onto the filter element 104. The process further comprises aa third step 706 wherein the incoming air passes through the filter element 104 and in process deposits the impurities onto the surface of the filter element 104. The process provides for the fourth and final step 708 wherein the filtered air obtained after the passage of incoming air through the filter element 104 exits the self-cleaning air filter system 100 through an outlet pipe 110. [0047] Now referring to Fig 8, a process for operation in cleaning mode 800 of the self-cleaning air filter system 100 is illustrated. The process 800

comprises a first step 802 of providing a pulse of compressed air is forced onto the filter element 104 from the nozzles 106. The process 800, further comprises a second step 804 wherein the compressed air dislodges the dust particles settled onto the onto the filter element 104. The process 800, further provides a third step 806 wherein the compressed air operates the valves 112 so as to close the passage for the incoming air. The process 800, further provides a fourth step 808 wherein the compressed air operates the valves 112 so as to open a passage through a first end 118 of the suction pipe 116. The process 800, further comprises a fifth step 810 wherein the compressed air carries the dislodged dust through the first end 118 into the suction pipe 116. The process 800, provides for a sixth and final step 812 wherein a suction source 124 creates a suction force to evacuate the dislodged dust particle from the Self-Cleaning Air Filter System 100 to an external environment. [0048] Figs. 7 and 8 are merely examples. A person skilled in the art will recognize many variations, alternatives, and modifications of the embodiments of the present disclosure.
[0049] Embodiments of the present disclosure can be used for various purposes, including, though not limited to, manufacturing and servicing of the internal combustion engines.
[0050] Modifications to various embodiments of the present disclosure described in the foregoing are possible without departing from the scope of the present disclosure as defined by the accompanying claims. Expressions such as “including”, “comprising”, “incorporating”. “consisting of”, “have”, “is” used to describe and claim the present disclosure are intended to be construed in a non-exclusive manner, namely allowing for items, components or elements not explicitly described also to be present. Reference to the singular is also to be construed to relate to the plural.

We Claim:
1. A self-cleaning air filter system comprising:
a housing having an open top end and an open bottom end;
a filter element placed axially inside the housing;
a plurality of nozzles coupled along an inner peripheral surface of the housing, the plurality of nozzles surrounding the filter element and connected to an air source supplying compressed air;
an air inlet pipe placed axially at the bottom end of the housing, the air inlet pipe comprising:
a suction pipe integrated inside the air inlet pipe and having a first end and a second end, the first end placed axially near a top end of the air inlet pipe and the second end placed after a bend, the bend enabling tangential exit of the suction pipe from the air inlet pipe;
an air outlet pipe placed axially at the top of the housing; and
a valve, such that the valve allows the flow of incoming air from the air inlet pipe when in open position, and, allows passage of dust dislodged from the filter elements through the suction pipe when in closed position.
2. The self-cleaning air filter system as claimed in claim 1, wherein
the valve is positioned between the air inlet pipe and the suction pipe at
the first end of the suction pipe.

3. The self-cleaning air filter system as claimed in claim 2, wherein the valve is a self-operated valve being operated according to the direction of flow of air inside the filter element.
4. The self-cleaning air filter system as claimed in claim 1, wherein the first end of the suction pipe is axially merged with the top end of the air inlet pipe and the valve is positioned at the bend.
5. The self-cleaning air filter system as claimed in claim 4, wherein the valve is a self-operated valve being operated according to the direction of flow of air inside the air inlet pipe.
6. The self-cleaning air filter system as claimed in claim 1, wherein the filter element is an inside-out flow filter element.
7. The self-cleaning air filter system as claimed in claim 1, wherein the air source supplies compressed air to the plurality of nozzles and causes the filtered dust trapped in the filter element to be dislodged by pneumatic shaking.
8. The self-cleaning air filter system as claimed in claim 1, wherein the air source comprises an air tank.
9. The self-cleaning air filter system as claimed in claim 1, wherein during a cleaning mode the plurality of nozzles force one or more pulse of

compressed air onto the filter element thereby dislodging dust particles settled on the filter element, and evacuating the dust particles along with the compressed air through the suction pipe out of the self-cleaning air filter system.