Abstract:
A dust collecting apparatus for a vacuum cleaner, which includes, a cyclonic chamber with an air inlet and a first outlet being formed therein, the cyclonic chamber causing air from the air inlet to spin therein, a dust receptacle connected to the cyclonic chamber, a grill assembly in the cyclonic chamber and on the upstream side of the air outlet to prevent dust and contaminants separated from the air from backflowing through the first air outlet, a main filter assembly connected to the grill assembly for filtering out dust and contaminants from the air backflowing from the grill assembly, and a supplementary filter assembly on the outside of the cyclonic chamber to re-filter the fine dust and contaminants incoming from the first air outlet. While conventional cyclone type vacuum cleaners are limited by the amount of contaminants that can be separated from the air, the disclosed vacuum cleaner can more effectively separate dust and contaminants.

Description:
BACKGROUND OF THE INVENTION  
         [0001]    1. Field of the Invention  
           [0002]    The present invention relates to a cyclone type vacuum cleaner, and more particularly, to dust collecting apparatus for a cyclone type vacuum cleaner capable of preventing dust and contaminants which are drawn into a cyclonic chamber, from leaking towards a current driving source.  
           [0003]    2. Description of the Prior Art  
           [0004]    Generally, a dust collecting apparatus for a cyclone type vacuum cleaner generates spinning air in a cyclonic chamber and separates dust and contaminants from the air by using centrifugal force generated from the spinning air. The dust collecting apparatus is usually provided with a dust backflow preventing portion for preventing backflow of dust and contaminants towards the air outlet of the cyclonic chamber. One example of a conventional dust collecting apparatus for a cyclone type vacuum cleaner having such a dust backflow preventing portion is disclosed in WO 00164321.  
           [0005]    [0005]FIGS. 1 and 2A and  2 B illustrate one example of a conventional cyclone type vacuum cleaner having a dust backflow preventing portion. As shown, the dust collecting apparatus  10  for cyclone type vacuum cleaner includes a cyclonic chamber  11 , a dust receptacle  13  and a grill assembly  20 .  
           [0006]    The cyclonic chamber  11  includes an air inlet  11   a  and an air outlet  11   b . The air inlet  11   a  is formed in a side of the cyclonic chamber  11  in a tangential direction. The air outlet  11   b  is formed approximately at the center of the upper side of the cyclonic chamber  11 . With the cyclone dust collecting apparatus  10  being mounted on the cleaner body, the air inlet  11   a  is connected with a first conduit  31  which is fluidly connected to a suction brush (not shown) of the cleaner body, while the air outlet  11   b  is connected with a second conduit  33  which is fluidly connected to a motor driving chamber (not shown) of the cleaner body.  
           [0007]    Accordingly, dust and contaminant laden air, which is drawn in through the suction brush, is passed through the first conduit  31  and the air inlet  11   a  and drawn into the cyclonic chamber  11  in a tangential direction. As a result, the drawn air is spinning in the cyclonic chamber  11 , and the dust is thrown out from the air by the centrifugal force of the spinning air. The cleaned air is discharged outside via the air outlet  11   b , the second conduit  33  of the cleaner body and the motor driving chamber.  
           [0008]    The dust receptacle  13  is removably connected to the lower portion of the cyclonic chamber  11 , and collects the dust thrown out from the spinning air of the cyclonic chamber  11 .  
           [0009]    A grill assembly  20  is mounted at the gate of the air outlet  11   b  inside the cyclonic chamber  11 , preventing the separated dust and contaminants from flowing back through the air outlet  11   b . The grill assembly  20  has a plurality of louvers  23  formed on the outer circumference of the grill body  21  which are in fluid contact with the air outlet  11   b.    
           [0010]    The louvers  23  are connected and arranged on the outer circumference of the grill body  21  at predetermined intervals. As shown in FIG. 2A, there are air passages  23   a  defined between the louvers  23 .  
           [0011]    As shown in FIG. 2B, each louver  23  is arranged such that the centerline thereof is at an acute angle with respect to the streamline of the spinning air (shown as an arrow). Accordingly, there is an abrupt direction shift of the air particles more than 90° when the air enters the air passages  23   a  among the louvers  23 , and thus, air velocity changes and dust is separated from the air.  
           [0012]    As described above, by forming the grill assembly with the plurality of louvers  23  formed thereon at the air outlet side, some dust particles can be separated from the air. However, there are other dust and contaminant particles that remain in the air current even with the air velocity changes. These remaining dust and contaminant particles are directed toward the air driving source, deteriorating the performance of the cyclone type vacuum cleaner.  
         SUMMARY OF THE INVENTION  
         [0013]    Accordingly, it is an aspect of the present invention to provide a dust collecting apparatus for a cyclone type vacuum cleaner, that overcomes the inability of the prior art dust backflow preventing devices such as a grill assembly to more effectively separate dust and contaminants from the air, by filtering the air passing through the dust backflow preventing portion of the apparatus.  
           [0014]    In order to achieve the above aspects and/or features of the present invention, a dust collecting apparatus for a cyclone type vacuum cleaner includes a cyclonic chamber having an air inlet in fluid contact with a first conduit which is in fluid contact with a suction brush of a cleaner body, and also having a first air outlet, the cyclonic chamber causing a dust and contaminant-laden air stream drawn through the air inlet to spin, a dust receptacle for receiving dust and contaminants which are thrown out from the spinning air by a centrifugal force, the dust receptacle removably connected to the cyclonic chamber, a grill assembly disposed inside the cyclonic chamber and on an upstream side of the air outlet for preventing the dust and contaminants, which are thrown out of the drawn air, from flowing backwards through the first air outlet, and a filter assembly formed at an outer side of the cyclonic chamber for filtering out the dust and contaminants being discharged from the air outlet. The filter assembly includes a filter member, a filter frame receiving the filter member therein, and having a second air outlet corresponding to the first air outlet of the cyclonic chamber, and a third air outlet in fluid contact with a second conduit which is in fluid contact with an air driving source, and a cover portion removably connected with the filter frame in which the filter member is seated.  
           [0015]    There are provided a plurality of first support projections formed along an inner surface of a lower portion of the filter frame, for causing the incoming air from the second air outlet to be evenly distributed over the filter member surface.  
           [0016]    There are provided a plurality of second support projections formed along an inner surface of an upper portion of the cover portion, for causing the air passing through the filter member to flow through the third air outlet and also for supporting the filter member in cooperation with the first support projections.  
           [0017]    According to a preferred embodiment of the present invention, free ends of the first and the second support projections are rounded, and the cover portion is connected with the filter frame by a rotatable connecting means.  
           [0018]    The rotatable connecting means includes at least one connecting groove portion formed on the upper side of the filter frame and facing each other, having one side that is open in the rotation direction of the cover portion and another side that is closed, and at least one connecting projection formed on the cover portion in a radial direction to correspond to the connecting groove portion.  
           [0019]    The cover portion includes a grip formed on the outer side of the upper portion, for easy handling of the cover portion when rotating the cover portion for connecting with the filter frame.  
           [0020]    Furthermore, the filter frame can be removably screw-fastened with the upper side of the cyclonic chamber, and the filter frame can be integrally formed with the upper side of the cyclonic chamber.  
           [0021]    Meanwhile, the grill assembly includes a grill body, a plurality of louvers formed on the outer circumference of the grill body at an acute angle with respect to the streamline of the spinning air, and a dust blocking member formed at an upstream end of the grill body, for shifting the advancing direction of the contaminant in the louver-headed air toward the spinning air.  
           [0022]    The upper side of the grill body may include a screw hole for screw-fastening the grill body to the cyclonic chamber.  
           [0023]    The lower side of the filter frame may include a screw hole corresponding to the screw hole of the upper side of the grill body. Accordingly, the grill body, the cyclonic chamber and the filter frame can be screw-fastened to each other.  
           [0024]    The dust blocking member may be integrally formed with the grill body.  
           [0025]    The dust blocking member includes a first conical member secured to the grill body and increasing in diameter towards the lower portion, and a second cylindrical member directly extended downwardly from the first conical member to a predetermined depth.  
           [0026]    The first conical member and the second cylindrical member may be integrally formed with each other.  
           [0027]    Furthermore, in order to achieve the above aspects and/or features of the present invention, a dust collecting apparatus for a cyclone type vacuum cleaner includes a cyclonic chamber having an air inlet in fluid contact with a first conduit which is in fluid contact with a suction brush of a cleaner body, and also having a first air outlet, the cyclonic chamber causing a dust and contaminant-laden air stream drawn through the air inlet to spin, a dust receptacle for receiving a dust and contaminants which is are thrown out from the spinning air by a centrifugal force, the dust receptacle removably connected to the cyclonic chamber, a grill assembly disposed inside the cyclonic chamber and on an upstream side of the air outlet for preventing the dust and contaminants, which are thrown out of the drawn air, from flowing backwards through the first air outlet, a main filter assembly removably connected inside the grill assembly, for filtering out the dust and contaminants being discharged from the grill assembly, and a supplementary filter assembly formed at an outside of the cyclonic chamber, for re-filtering minute dust and contaminants flowing in through the first air outlet.  
           [0028]    The main filter assembly includes a main filter member for filtering dust and contaminants back-flowing from the grill assembly, a main filter support portion having a plurality of frames for supporting the main filter member from within, and a dust blocking member disposed at a lower end of the main filter support portion, for shifting the advancing direction of the contaminant in the grill assembly-headed air towards the spinning air.  
           [0029]    The main filter member may be formed of a washable material for easy cleaning, and provided on the main filter member may be folds for increasing the contact area with the incoming air through the grill assembly.  
           [0030]    According to the preferred embodiment of the present invention, the folds of the main filter member are formed in a lengthwise direction of the main filter member.  
           [0031]    The main filter member may be formed of polyester.  
           [0032]    The dust blocking member includes a first conical member secured to the main filter member and increasing in diameter towards the lower portion, and a second cylindrical member directly extended downwardly from the first conical member to a predetermined depth.  
           [0033]    The first conical member and the second cylindrical member may be integrally formed with each other.  
           [0034]    Here, the grill assembly includes a grill body, with upper side being removably connected to the upper side of the cyclonic chamber and the lower side being sealingly supported on the dust blocking member, and a plurality of louvers formed on the outer circumference of the grill body to form an acute angle with respect to the streamline of the spinning air.  
           [0035]    The upper side of the grill body may include a screw hole for screw-fastening the grill body to the cyclonic chamber.  
           [0036]    The supplementary filter assembly includes a supplementary filter member, a supplementary filter frame receiving the supplementary filter member therein, with a second air outlet being formed therein corresponding to the first air outlet of the cyclonic chamber, and a third air outlet being formed in a side thereof in fluid contact with a second conduit which is in fluid contact with an air driving source, and a cover portion removably connected with the upper side of the supplementary filter frame in which the supplementary filter member is seated.  
           [0037]    There are provided a plurality of first support projections formed along the inner surface of the lower portion of the filter frame, for causing the incoming air through the second air outlet to be evenly distributed over the filter member surface.  
           [0038]    There are provided a plurality of second support projections formed along the inner surface of the upper portion of the cover portion, for causing the air passing through the supplementary filter member to flow through the third air outlet and also for supporting the supplementary filter member in cooperation with the first support projections.  
           [0039]    The cover portion is connected to the supplementary filter frame by a rotatable connecting means.  
           [0040]    The rotatable connecting means includes at least one connecting groove portion formed on the upper side of the filter frame and facing each other, having one side that is open in the rotation direction of the cover portion and another side that is closed, and at least one connecting projection formed on the cover portion in a radial direction to correspond to the connecting groove portion.  
           [0041]    On the outer side of the upper portion of the cover is a grip for easy handling of the cover portion when rotating the cover portion for connecting with the filter frame.  
           [0042]    The supplementary filter frame can be removably screw-fastened with the upper side of the cyclonic chamber, and the supplementary filter frame can be integrally formed with the upper side of the cyclonic chamber.  
           [0043]    The upper side of the grill body may include a screw hole for screw-fastening the grill body to the cyclonic chamber, the upper side of the main filter support portion may include a screw hole corresponding to the screw hole of the grill body, and the lower side of the supplementary filter frame may include a screw hole corresponding to the screw hole of the upper side of the grill body. Accordingly, the grill body, the main filter support portion, the cyclonic chamber and the supplementary filter frame may be screw-fastened to each other.  
           [0044]    The grill assembly includes a grill body, a plurality of louvers formed on the outer circumference of the grill body at an acute angle with respect to the streamline of the spinning air, and a dust blocking member formed at an upstream end of the grill body, for shifting the advancing direction of the contaminant in the louver-headed air toward the spinning air.  
           [0045]    The main filter assembly includes a main filter member for filtering the backflow of dust and contaminants of the grill assembly, and a main filter support portion having a plurality of frames for supporting the main filter member from within, and sealingly supported on the dust blocking member of the grill assembly.  
           [0046]    The grill assembly and the main filter assembly are integrally formed with each other, and in the upper side of the grill body may be formed a screw hole for a screw-fastening with the cyclonic chamber.  
           [0047]    The upper side of the grill body may include a screw hole for screw-fastening the grill body to the cyclonic chamber, and the lower side of the supplementary filter frame may include a screw hole corresponding to the screw hole of the upper side of tie grill body. Accordingly, the grill body being integrally formed with the main filter assembly, the cyclonic chamber and the supplementary filter frame may be screw-fastened with each other, integrally.  
           [0048]    The dust blocking member includes a first conical member secured to the grill body and increasing in diameter towards the lower portion, and a second cylindrical member directly extended downward from the first conical member to a predetermined depth.  
           [0049]    While the conventional cyclone type vacuum cleaner is limited in the amount of dust and contaminants that it can separate from the drawn air using dust backflow preventing device such as louvers, the cyclone type vacuum cleaner according to the present invention, provided with the main filter assembly and the supplementary filter assembly, can better separate dust and contaminants.  
           [0050]    As a result, deterioration of dust collecting efficiency due to backflow of contaminant is prevented, and a cyclone type vacuum cleaner that satisfies the customer&#39;s demands and has a higher competitiveness can be provided.  
           [0051]    With these and other objects, advantages and features of the invention that may become hereinafter apparent, the nature of the invention may be more clearly understood by reference to the following detailed description of the invention, the appended claims and to the several drawings attached herein.  
       
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0052]    The above aspects and other features of the present invention will become more apparent by describing in detail a preferred embodiment thereof with reference to the attached drawings, in which:  
         [0053]    [0053]FIG. 1 is a cross-sectional view schematically showing a conventional dust collecting apparatus for a cyclone type vacuum cleaner;  
         [0054]    [0054]FIG. 2A is a schematic perspective view of a grill assembly adapted to the dust collecting apparatus of FIG. 1 showing an arrangement of louvers;  
         [0055]    [0055]FIG. 2B is a partial cross-sectioned view illustrating the operation of the louvers of the grill assembly of FIG. 2A;  
         [0056]    [0056]FIG. 3 is an exploded perspective view schematically illustrating a dust collecting apparatus for a cyclone type vacuum cleaner according to a first preferred embodiment of the present invention;  
         [0057]    [0057]FIG. 4 is a schematic cross-sectional view illustrating the dust collecting apparatus of FIG. 3;  
         [0058]    [0058]FIG. 5 is an exploded perspective view schematically illustrating a dust collecting apparatus for a cyclone type vacuum cleaner according to a second preferred embodiment of the present invention; and  
         [0059]    [0059]FIG. 6 is a schematic sectional view illustrating the dust collecting apparatus of FIG. u 5 . 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT  
       [0060]    Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. Several preferred embodiments of the invention are described for illustrative purposes, it being understood that the invention may be embodied in other forms not specifically shown in the drawings.  
         [0061]    [0061]FIG. 3 is an exploded perspective view of a dust collecting apparatus for a cyclone type vacuum cleaner according to a first preferred embodiment of the present invention, and FIG. 4 is a cross-sectional view of the dust collecting apparatus of FIG. 3.  
         [0062]    The reference numeral  100  denotes a cyclone dust collecting apparatus,  110  is a cyclonic chamber,  120  is a grill assembly,  130  is a filter assembly,  140  is a dust receptacle, and  150  is a rotatable connecting means.  
         [0063]    According to the first preferred embodiment of the present invention, the dust collecting apparatus  100  for a cyclone type vacuum cleaner includes the cyclonic chamber  110 , the dust receptacle  140 , the grill assembly  120  and the filter assembly  130 .  
         [0064]    The cyclonic chamber  110  includes an air inlet  111  through which air generated by an air driving source (not shown) is drawn, and a first air outlet  113  through which the air is discharged. The cyclonic chamber  110  is open at a lower side. The air inlet  111  is connected to a first conduit  161  which is in fluid contact with a suction brush (not shown) of a cleaner body (not shown), and formed in a tangential direction with respect to the side of the cyclonic chamber  110 . Accordingly, the air spins as it is drawn into the cyclonic chamber  110 . The first air outlet  113  is connected to a second conduit  163  which is in fluid contact with the air driving source (not shown) of the cleaner body, and formed approximately at a center of the upper side of the cyclonic chamber  110 .  
         [0065]    The dust-laden air is drawn in through the suction brush (not shown) during the cleaning operation, and then drawn via the air inlet  111  into the cyclonic chamber  110  in a tangential direction As a result, the air spins in the cyclonic chamber  110 , and the dust is thrown out by the centrifugal force of the spinning air current. The cleaned air is discharged via the air outlet  111  and the air driving source (not shown).  
         [0066]    The dust receptacle  140  is removably connected to the lower portion of the cyclonic chamber  110  to receive dust and contaminant thrown out from the spinning air of the cyclonic chamber  110 . The dust receptacle  140  may be provided with a handle for a user to grip, and when the dust receptacle  140  is filled with the dust, the dust receptacle  140  is separated from the cleaner and collected dust is dumped.  
         [0067]    The grill assembly  120  is formed at the first air outlet  113  inside of the cyclonic chamber  110 , and prevents the separated dust and contaminant from flowing backward through the first air outlet  113 . The grill assembly  120  includes a grill body  121 , louvers  123  formed on the outer circumference of the grill body  121  and a dust blocking member  125  formed at an upstream end of the grill body  121 .  
         [0068]    The grill body  121  has a screw hole  121   a  formed at the upper side, for screw-fastening to the cyclonic chamber  110 .  
         [0069]    Each louver  123  is arranged such that the centerline thereof is at an acute angle with respect to the streamline of the spinning air so as to define an air passage on the outer circumference of the grill body in fluid contact with the first air outlet  113  (FIG. 2B). Due to the presence of the louvers  123 , the velocity of spinning air current changes and thus, backflow of the dust is prevented. As the acute angle is smaller, or, the gap between the louvers  123  is narrower (in other words, as the width of the air passage is narrower), prevention of the dust backflow is more ensured. However, as much as the acute angle or the gap narrows, the air passing the air passage experiences greater resistance.  
         [0070]    As noise increases and suction force deteriorates, the performance of the vacuum cleaner degrades. Accordingly, it is preferable to arrange the louvers  123  at a predetermined acute angle and predetermined intervals such that, with shadows of the louvers  123  being cast on an imaginary coaxial cylinder, the shadow of one louver  123  overlaps the shadow of adjacent louver  123  by the range of 10% to 50%.  
         [0071]    The dust blocking member  125  is formed such that it covers the open lower end of the grill body  121 , and serves to shift the advancing direction of the dust in the louver-headed air towards the spinning air inside of the cyclonic chamber  110 . The dust blocking member  125  may be formed integrally with the grill body  121 . Alternatively, the dust blocking member  125  may be secured to the grill body  121 , and includes a first conical member  125   a  which increases in diameter toward the lower portion, and a second cylindrical member  125   b  extended directly downward from the first member  125   a  to a predetermined depth. In any case, the above structures ensure that the rising dust is effectively blocked and falls back towards the spinning air current, and accordingly, dust is prevented from rising towards the louvers  123 , but is blocked and falls into the dust receptacle  140 .  
         [0072]    The filter assembly  130  is disposed at the outer side of the cyclonic chamber  110 , and filters the dust which is not filtered at the grill assembly  120 . The filter assembly  130  includes a filter member  131 , a filter frame  133  in which the filter member  131  is seated, and a cover portion  135 .  
         [0073]    The filter frame  133  receives the filter member  131  therein, and has a second air outlet  133   a  formed at a position corresponding to the first air outlet  113  of the cyclonic chamber  110  so as to permit air to discharge from the cyclonic chamber  110 . The filter frame  133  also has a third air outlet  133   b  formed at a side so that the air is discharged through the second conduit  163  which is fluidly connected with the air driving source (not shown). The filter frame  133  has a plurality of first support projections  133   b  formed inside of the filter frame  133  at a lower portion for causing the incoming air from the second air outlet  133   a  to be evenly distributed and passed. The filter frame  133  has a screw hole  133   c  for a screw-fastening with the upper side of the cyclonic chamber  110 . It is preferable that the screw holes of the grill body  121 , the cyclonic chamber  110  and the filter frame  133  are formed to correspond to each other, because integrally screw-fastening the grill body  121  the cyclonic chamber  110  and the filter frame  133  through the corresponding screw holes reduces the number of parts.  
         [0074]    Meanwhile, according to the first preferred embodiment of the present invention, the filter frame  133  may be integrally connected to the upper portion of the cyclonic chamber  110 .  
         [0075]    The cover portion  135  is removably connected to the filter frame  133  by the rotatable connecting means  150 , and has a plurality of second support projections  135   a  formed inside at the upper portion so that the air past through the filter member  131  can pass through the third air outlet  133   b . The first and second support projections  133   b ,  135   a  securely support the filter member  131  so that the filter member  131  is not moved by the air current. Free ends of the first and second support projections  133   b ,  135   a  are rounded so as not to damage the filter member  131  which is disposed therebetween.  
         [0076]    The rotatable connecting means  150  includes connecting groove portions  152  abutting on the open upper side of the filter frame  133 , and connecting projection  151  protruding from the cover portion  135  in a radial direction.  
         [0077]    More specifically, the connecting groove portions  152  are formed on the upper side of the filter frame  133  opposite each other. One side of each connecting groove portion  152  is open with respect to the rotational direction of the cover portion  135 , while the opposite side is closed. Accordingly, as the cover portion  135  is rotated, the connecting projections  151  are inserted in the open sides of the connecting groove portions  152 , and then stopped by the closed sides of the connecting groove portions  152 . For the user to easily rotate the cover portion  135 , it is preferable to use a grip  135   b  on the outer surface of the upper side of the cover portion  135 . Since the cover portion  135  is secured to the filter frame  133  by the rotatable connecting means  150 , in a state that the filter member  131  is supported on the first and second support projections  133   b ,  135   a , a need for an additional filter member securing device is eliminated.  
         [0078]    The operation of the dust collecting apparatus  100  for the cyclone type vacuum cleaner is described below.  
         [0079]    By the air driving source (not shown) of the cyclone type vacuum cleaner, dust laden air is drawn in through the suction brush (not shown). The dust-laden air is then drawn to the cyclonic chamber  110  through the air inlet  111  which is connected to the first conduit  161  that is in fluid contact with the suction brush. Because the air enters the air inlet  11  tangentially with respect to the cyclonic chamber  110 , the air spins in the cyclonic chamber  110 .  
         [0080]    By the centrifugal force of the spinning air, dust is pushed out from the air current and collected in the dust receptacle  140 . If there is any remaining dust that is not separated in the above process, the dust is re-separated as the air passes through the louvers  123  of the grill assembly  120 . That is, while the air passes through the grill assembly  120 , the dust is blocked by the dust blocking member  125  and thus, prevented from rising, and instead falls back to the spinning air where the dust is thrown out and collected in the dust receptacle  140 .  
         [0081]    Meanwhile, any remaining dust that is not separated by the louvers  123  of the grill assembly  120 , is passed through the first air outlet  113  of the cyclonic chamber  110  and re-filtered at the filter assembly  130  that is disposed outside of the cyclonic chamber  110 . The clean air is passed through the third air outlet  133   b  and the second conduit  163 , and discharged outside via the air driving source. By use of the above structures, dust from the air can be effectively separated.  
         [0082]    Meanwhile, a dust collecting apparatus  200  for a cyclone type vacuum cleaner according to a second preferred embodiment of the present invention includes, as shown in FIGS. 5 and 6, a cyclonic chamber  110 , a dust receptacle  140 , a grill assembly  220 , a main filter assembly  240  and a supplementary filter assembly  230 .  
         [0083]    The cyclonic chamber  110  and the dust receptacle  140  are constructed and operated in the same manner as described above in the first preferred embodiment, and accordingly, further description thereof will be omitted.  
         [0084]    The main filter assembly  240  is removably connected inside the grill assembly  220 , and filters and thus reduces the dust passing through the grill assembly  220  from flowing out of the cyclonic chamber  110 . The main filter assembly  240  includes a main filter member  243 , a main filter support portion  241 , and a dust blocking portion  245 .  
         [0085]    The main filter member  243  can be preferably formed of a washable material for convenient cleaning, and have folds formed thereon for the sake of increasing contact area relative to the incoming air from the grill assembly  220 .  
         [0086]    The folds are formed in the lengthwise direction of the main filter member  243 , and the main filter member  243  is preferably formed of polyester.  
         [0087]    The main filter support portion  241  has a plurality of frames  241   a  for supporting the main filter member  243  from within. There are a plurality of air holes  241   b  formed among the plurality of frames  241   a , for permitting the air to pass through the main filter member  243  and discharge through the first air outlet  113 . There is a screw hole  241   c  formed on the upper side, for screw-fastening with the cyclonic chamber  110 .  
         [0088]    The dust blocking portion  245  is formed to cover the lower end of the main filter support portion  241 . It is also possible that the dust blocking portion  245  is integrally formed with the main filter support portion  241 . The dust blocking portion  245  includes a first conical member  245   a  gradually increasing in diameter towards the lower portion, and a second cylindrical member  245   b  extended directly downward from the first conical member  245   a  to a predetermined depth. The first and second members  245   a ,  245   b  may be integrally formed with each other.  
         [0089]    Meanwhile, although it was depicted in the second embodiment that the dust blocking portion  245  is formed at the main filter support portion  241 , the dust blocking portion  245  may also be formed at the grill body  221  as in the first embodiment of the present invention.  
         [0090]    The dust blocking portion  245  constructed as above shifts the direction of the dust in the louver-headed air back to the spinning air inside the cyclonic chamber  110 , and the dust is prevented from rising towards the louver  223 , and instead falls into the dust receptacle  140 .  
         [0091]    The grill assembly  220  includes a grill body  221  and a plurality of louvers  223  formed on the outer circumference of the grill body  221 . The upper side of the grill body  221  is removably connected with the upper portion of the cyclonic chamber  110 , while the lower side of the grill body  221  is sealingly supported on the dust blocking portion  245  of the grill assembly  220 .  
         [0092]    The louvers  223  are formed on the outer circumference of the grill body  221  at an acute angle with respect to the streamline of the spinning air of the cyclonic chamber  110 . The operation and effect of the louvers  223  are the same as described above and thus omitted here.  
         [0093]    The grill body  221  has a screw hole  221   a  formed on the upper side and can be screw-fastened with the cyclonic chamber  110 . According to this embodiment, the respective screw holes of the grill body  221 , the filter support portion  231  and the supplementary filter frame  233  may be formed to correspond to each other so that the respective parts can be fastened with each other, integrally.  
         [0094]    Alternatively, the grill body  221  may be integrally formed with the main filter assembly  240 , requiring no additional fastening such as screw-fastening.  
         [0095]    The supplementary filter assembly  230  includes a supplementary filter member  231 , a supplementary filter frame  233  receiving the supplementary filter member  231  therein, and a cover portion  235  removably connected with the supplementary filter frame  233 . The structure and operation of the respective parts are same as described in the first embodiment, and thus, further description thereof will be omitted.  
         [0096]    With the dust collecting apparatus  200  for a cyclone type vacuum cleaner according to the second preferred embodiment of the present invention, the dust separation is performed more effectively because the remaining dust, which has not separated by the louvers  223  and the dust blocking portion  245 , are filtered out as the air passes through the main filter member  243  of the main filter assembly  240 .  
         [0097]    Although a few preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that the present invention should not be limited to the described preferred embodiments, but various changes and modifications can be made within the spirit and scope of the present invention as defined by the appended claims.