FR2847451A1 - Cyclone dust collecting apparatus grill assembly for canister type vacuum cleaner, has dust blocking portion to block dust entrained in air current ascending toward grill body to deflect dust toward whirling air current - Google Patents

Abstract

The assembly has air passages formed on a grill body, and a dust blocking portion (43) arranged at a lower portion of the grill body. The dust blocking portion blocks the dust entrained in an air current ascending toward the grill body to deflect the dust toward whirling air current. The blocking portion has a portion formed as a frustum cone and another portion formed as a hollow cylinder. The prior portion formed as the frustum cone has a gradually increasing diameter downward. The other portion formed as the hollow cylinder vertically extends from a lower side of the prior portion. An Independent claim is also included for a cyclone dust collecting apparatus for use in a vacuum cleaner.

Description

The present invention relates generally to an apparatus for

  cyclone dust collection for use in a vacuum cleaner, and more particularly, it relates to a grid assembly having an improved structure capable of separating dust and foreign substances (hereinafter "dust") from an air moving inside the cyclone dust collecting apparatus, and to a cyclone dust collecting apparatus having

the grid assembly.

  A cyclone dust collecting apparatus separates particles from a fluid using centrifugal force, and has been widely used in the industrial fields due to its high resistance to temperature and pressure. Such a cyclone dust collection device is also used in vacuum cleaners. A representative example of such a cyclone dust collecting device is shown in Korean patent number 317117 issued to the present applicant, and Figure 1 schematically shows a sectional view of such a cyclone dust collecting device for

use in a vacuum cleaner.

  As shown in Figure 1, the cyclone dust collection apparatus is mounted on extension hoses 1a, 1b of the vacuum cleaner. For the sole practical purpose of the explanation, the cyclone dust collecting apparatus is described as the cyclone dust collecting apparatus for a canister type vacuum cleaner, compared to that of a broom type vacuum cleaner, which will be

also described later.

  Referring to Figure 1, the cyclone dust collecting apparatus for the canister type vacuum cleaner includes a cyclone body 20, a receptacle for

  dust 30 and a grid assembly 40.

  The cyclone body 20 comprises a first connection pipe 21 connected to the extension pipe la towards the suction brush of the vacuum cleaner, a second connection pipe 22 connected to the extension pipe lb towards the body of the vacuum cleaner , an air inlet 23 being in fluid communication with the first connection pipe 21, and an air outlet 24 being in fluid communication with the second connection pipe 22. The dust-laden air is drawn into the cyclone body 20 across

  the air inlet 23 in a swirling current.

  The dust receptacle 30 is detachably connected to the cyclone body 20, and separates the separated dust from the swirling air which moves at

  inside the cyclone body 20.

  The grid assembly 40 is arranged at the air outlet 24 of the cyclone body 20, preventing the dust collected in the dust receptacle 30 from reversing towards the vacuum cleaner body. The grid assembly 40 comprises a grid body 41, several air passages 42 formed in an outer circumference of the grid body 41 in fluid communication with the air outlet 24, and a dust blocking element 43 under the shape of a truncated cone mounted on one end of the

grid body 41.

  In the conventional cyclone dust collection apparatus for use in a canister type vacuum cleaner constructed as above, thanks to the suction generated at the suction brush of the vacuum cleaner, the air charged with dust is sucked into the cyclone body 20 through the first connecting pipe 21 in an oblique relation to the cyclone body 20. Consequently, the sucked air is moved towards the lower part of the dust receptacle 30 in a stream of swirling air. In this process, the dust is separated from the swirling air due to centrifugal force, and collected in the dust container 30. Then, the air is reflected from the bottom of the dust container 30 and moves upwards. in

  a circle smaller than the downward air flow.

  Thanks to the rising air flow, the air is evacuated towards the outside of the vacuum cleaner body through the air passages 42, the air outlet 24 and the second hose.

connection 22.

  Part of the dust is sucked into the swirling air stream rising inside the dust receptacle 30, but is then blocked by the dust blocking member 43 and entrained again in the swirling air stream. The dust blocked by the dust blocking element 43 does not pass through the air passages 42 of the grid assembly, and the dust is drawn back into the swirling air stream and collected in the

dust container 30.

  Figure 2 is a sectional view showing a conventional cyclone dust collection apparatus

  for use in a broom type vacuum cleaner.

  Referring to Figure 2, the conventional cyclone dust collection apparatus for use in the broom type vacuum cleaner has a basic structure similar to that of the cyclone dust collection apparatus for use in the canister type vacuum cleaner as described above. Therefore, the conventional cyclone dust collection apparatus for use in the broom type vacuum cleaner includes a cyclone body 200, a dust receptacle 300 and a grate assembly 400. The difference is that the collection apparatus cyclone dust from the broom type vacuum cleaner is mounted in the dust collection chamber of the vacuum cleaner body, while the canister type dust collection device is not. The difference will be described in detail below. The cyclone body 200 includes an air inlet pipe 210 and an air outlet pipe 220. When mounting the cyclone dust collecting apparatus in the vacuum cleaner body (not shown), the air inlet pipe 210 is connected to an air inlet passage which is formed in fluid communication with a suction brush (not shown) of the vacuum cleaner body. Likewise, the air outlet pipe 220 is connected to an air outlet passage which is formed in fluid communication with a motor chamber (not shown) of the vacuum cleaner body. Therefore, the dust-laden air is sucked in from the surface which is cleaned by the suction brush. The dust-laden air then travels through the air inlet passage and the air inlet pipe 210 of the vacuum cleaner body, and then into the cyclone body 200 in a tangential direction. Therefore, a swirling air stream is formed inside the cyclone body 200, causing the dust to be separated from the air sucked in by centrifugal force. Clean air is discharged outside through the air outlet pipe 220, and then through the air outlet passage and the motor chamber of the vacuum cleaner body. The dust receptacle 300 is detachably connected to the lower part of the cyclone body 200, in order to collect the dust separated from the air by the

swirling current.

  The grille assembly 400 is disposed at an inlet of the air outlet pipe 220 inside the cyclone body 200, preventing dust separated from

  escape through the air outlet pipe 220.

  The grid assembly 400 comprises a grid body 410, several air passages 420 formed on the exterior surface of the grid body 410. The air passages 420 allow fluid communication between the air outside of the grid assembly 400 and the air outlet pipe 220. The grid assembly 400 also includes a dust blocking element 430 in the form of a truncated cone mounted on a lower part of the

grid body 410.

  In the broom type vacuum cleaner equipped with a cyclone dust collecting apparatus constructed as above, when the cleaning operation is started, the motor in the motor chamber is driven, and the suction is therefore generated by the suction brush. The dust-laden air is drawn into the cyclone body 200 through the suction brush, and travels through the air inlet passage and the air inlet pipe 210 of the vacuum cleaner body . Due to the tangential orientation of the air inlet pipe 210, the dust laden air is drawn into the cyclone body 200 in an oblique direction along the inner circumference of the cyclone body 200. Therefore a swirling air stream is formed inside the cyclone body 200, and the dust is separated from the swirling air by centrifugal force and collected in the dust receptacle 300. The clean air is expelled to the outside through the air passages 420 of the grid assembly 400, and the air outlet pipe 220. Clean air then flows through the air outlet passage and the engine chamber of the vacuum cleaner body. In this process, the dust in the rising air stream inside the dust receptacle 300 is blocked by the dust blocking member 430, thereby being entrained back into the swirling air stream. Since the dust which is blocked by the dust blocking member 430 cannot pass through the air passages 420 of the grid assembly 400, the dust is entrained back into the swirling air stream and is eventually collected in the

dust container 300.

  In operation, the cyclone dust collection apparatus described above can help reduce the amount of dust collected by a paper filter. Considering that the paper filter is not recyclable after use, reducing the amount of dust collected from the paper filter and thus extending the life of the paper filter is very useful for reduce the financial burden on users. Research for the cyclone dust collection apparatus for use in a vacuum cleaner is now primarily focused on effectively retaining dust and preventing its escape from

across the grid assembly.

  Referring to Figures 1 and 2, the grid assembly 40, 400 has an air passage 42, 420 of a predetermined size for the discharge of clean air to the outside, and by nature, part of the dust escapes through the air passages 42, 420 of the grid assembly 40, 400 because the grid assembly 40, 400 is disposed at the inlet of the outlet pipe

  air 22, 220 inside the cyclone body 20, 200.

  When the dust escapes, the amount of dust collected by the paper filter increases, or else when there is no paper filter, there is an increased amount of dust released from the collection device of dust. As a result, the yield of

  dust collection is degraded.

  In order to prevent the escape of dust, in a conventional manner, a dust blocking element 43, 430 of frustoconical shape is mounted on the lower part of the grid body 41, 410. The dust blocking element 43, 430 blocks the dust in the rising air flow back to the swirling current so that the dust cannot flow near the

  air passage 42, 420 of the grid body 41, 410.

  However, conventional dust blockers 43, 430 are limited in their ability to prevent

all the dust to escape.

  Although dust of a predetermined size is blocked by the dust blocking member 43, 430 and thereby prevented from flowing into the air passage 42, 420 of the grid body 41, 410, dust such as that hair is small enough to pass through the space between the dust blocking member 43 and the inner wall of the dust receptacle 30, and between the dust blocking member 430 and the inner wall of the cyclone body 200. This fine dust sometimes clogs the grid body 41, 410 or is otherwise discharged outside through the air passages 42, 420, deteriorating the dust collection efficiency of the vacuum cleaner. Improvements can therefore be made. It is therefore an object of the present invention to provide a grid assembly of a cyclone dust collecting apparatus for use in a vacuum cleaner, having an improved structure which is capable of retaining and thereby minimizing the flow of dust including fine dust such as hair, through an air passage of

the grid assembly.

  It is another object of the present invention to provide a cyclone dust collection apparatus for use in a vacuum cleaner which contributes to an improved dust collection efficiency of the vacuum cleaner with a grid assembly having a structure

perfected.

  The above objects are achieved by a grid assembly of a cyclone dust collection apparatus for use in a vacuum cleaner, which is disposed at an inlet of an air outlet pipe of a body cyclone o a swirling air stream is formed from dust-laden air. The dust is separated from the dust-laden air by the centrifugal force of the swirling air stream, preventing the dust from escaping. The present invention includes a grid body, a plurality of air passages formed on the grid body, and a dust blocking member disposed at a lower portion of the grid body, blocking dust entrained in a stream of air rising towards the grid body and deflecting the dust towards the swirling air stream. The dust blocking element comprises a first element in the form of a truncated cone having a progressively increasing diameter downwards, and a second element in the form of a hollow cylinder spaced vertically from a bottom side of the first element, the second element having a predetermined length. Therefore, even small and long dust such as hair is blocked by the dust blocking member and cannot rise to the grid body. The dust is actually drawn back into the swirling air stream, separated from it and falls towards the dust container. As a result, the degradation of the dust collection efficiency due to the escaping dust is prevented. The multiplicity of air passages is formed by a multiplicity of fins which are arranged along an outer circumference of the grid body at a predetermined distance from each other, allowing fluid to pass through the air passages. As a result, the escape of dust through the air passages is prevented, and the collection efficiency of

dust is increased.

  In one aspect of the present invention, the dust blocking member is removably connected to a bottom side of the grid body by a connector. In another aspect, the connector includes a pair of connection holes oppositely formed in an inner circumference of a bottom portion of the grid body, each connection hole having a position guide portion having an open bottom end and a connecting portion spaced from the open lower end of the position guide portion, and a pair of connecting projections formed on an outer surface of an upper side of the dust blocking member, the projections corresponding to

connection holes.

  In another aspect, the connector includes a screw which is fixed from a lower side of the dust blocking member to a lower side of the grid body. Another object is achieved by a cyclone dust collecting apparatus for use in a vacuum cleaner, which is attached to an extension hose of a canister type vacuum cleaner and separates the dust by swirling the dust laden air . The cyclone dust collecting apparatus comprises a cyclone body comprising a first connecting pipe connected to an inlet extension pipe for sucking air, and a second connecting pipe connected to a connecting pipe 'outlet extension to exhaust air, a dust receptacle removably mounted on the cyclone body to collect dust separated from the dust laden air which swirls in the cyclone body through the centrifugal force, and a grid assembly disposed at an inlet of the second connection pipe inside the cyclone body, in order to prevent the separated dust from escaping through the second connection pipe. The grid assembly includes a grid body having a first grid body portion having a support rib adapted to engage the cyclone body, and a second grid body portion in the form of a hollow cylinder extending integrally from the first grid body part, a multiplicity of air passages formed on the outer surface of the second grid body part of the grid body, the air passages placing the air outside the grid assembly in fluid communication with the second connecting pipe, and a dust blocking member disposed at a lower portion of the second grid body for blocking dust entrained in an upward flow of air grid body and deflecting dust towards the swirling air stream, the dust blocking element comprising a first element in the form of a truncated cone having a progressing diameter ssively increasing downwards, and a second element extending vertically downwards from the first element, the

  second element having a predetermined length.

  The dust collecting apparatus for use in the broom type vacuum cleaner includes a cyclone body having an air inlet pipe connected to the air inlet passage, and an air outlet pipe connected to the air outlet passage, the cyclone body includes means for producing a swirling air stream from the dust-laden air which is sucked through the air inlet pipe, a dust receptacle detachably connected to the cyclone body, in order to collect dust separated from the dust-laden air which swirls inside the cyclone body by centrifugal force, and a grid assembly arranged at a inlet of the air outlet pipe inside the cyclone body, in order to prevent dust separated from the dust-laden air from escaping through the air outlet pipe. The grid assembly includes a grid body in the form of a hollow cylinder with an open upper end, a plurality of air passages formed on an exterior surface of the grid body which allows fluid to flow from the outside the grid assembly to the air outlet pipe, and a dust blocking element disposed at a lower part of the second grid body, in order to block the dust entrained in the ascending air towards the grid body so as to deflect the dust towards the swirling air stream, the dust blocking element comprising a first element in the form of a truncated cone having a progressively increasing diameter downwards, and a second element extending vertically downward from the first element, the second element having

a predetermined length.

  The aims and the characteristics mentioned above of the present invention will appear better thanks to

  the description of the preferred embodiment of the

  present invention with reference to the accompanying drawings, in which: Figure 1 is a schematic sectional view of a conventional cyclone dust collection apparatus for use in a canister type vacuum cleaner; Figure 2 is a schematic sectional view of a conventional cyclone dust collection apparatus for use in a vacuum cleaner of the broom type; Figure 3 is a sectional view of a preferred embodiment of a cyclone dust collection apparatus for use in a canister type vacuum cleaner, which is equipped with a grate assembly according to the present invention; Figure 4 is a perspective view showing the grid assembly of Figure 3; Figure 5 is an exploded perspective view showing the grid assembly of Figure 3; Figure 6 is a sectional view of a preferred embodiment of a cyclone dust collection apparatus for use in a broom type vacuum cleaner, which is equipped with a grate assembly according to the present invention; Figure 7 is a perspective view showing the grid assembly of Figure 6; and Figure 8 is an exploded perspective view

  showing the grid assembly of Figure 6.

  The objects and other features of the present invention will become more evident from the

  description of preferred embodiments by

  referring to the attached drawings. Throughout the description,

  identical elements have the same references.

  Figures 3 and 4 show a cyclone dust collection apparatus for use in a canister type vacuum cleaner, which is equipped with a grate assembly according to the present invention. Referring to Figures 3 and 4, the cyclone dust collection apparatus for use in a canister type vacuum cleaner includes a cyclone body 20, a receptacle for

  dust 30 and a grid assembly 40.

  The cyclone body 20 comprises a first connection pipe 21 connected to an inlet extension pipe la, which places the first connection pipe 21 in fluid communication with a suction brush of the vacuum cleaner, a second pipe connection 22 connected to an outlet extension pipe 1b, which extends towards the body of the vacuum cleaner, an air inlet 23 which is in fluid communication with the first connection pipe 21, and an outlet d air 24 which is in fluid communication with the second connecting pipe 22. The dust-laden air is drawn into the cyclone body 20 through the inlet 23 and into a

swirling current.

  The dust receptacle 30 is detachably connected to the cyclone body 20, and separates the separated dust from the swirling air which moves at

  inside the cyclone body 20.

  The grille assembly 40 is disposed at the air outlet 24 of the cyclone body 20, and is adapted to prevent dust collected in the dust container 30 from escaping from the dust container 30 and to flow towards the vacuum cleaner body. The grid assembly includes a grid body 41, a multiplicity of air passages 42 formed in an exterior surface of the grid body 41. The air passages 42 place the interior volume of the dust receptacle 30 in fluid communication with the air outlet 24. A dust blocking element 43 is mounted on one end of the grid body 41. The grid body 41 comprises a first part of grid body 41b and a second part of grid body 41c. The first grid body part 41b has a support rib 41a designed to engage the cyclone body 20. The second grid body part 41c is in the form of a hollow cylinder extending integrally from the first body part grid 41b. The air passages 42 are formed on the external surface of the second part of the grid body 41c in the form, as shown in FIG. 3, of a multiplicity of through holes. Alternatively, the air passages 42 may be in the form of slots which are defined by placing a plurality of fins on the outer surface of the second grid body portion 41c at predetermined angles. The slit-shaped air passages 42 are preferable to the other configurations because they more effectively prevent the escape of dust. The dust blocking element 43 prevents the escape of dust, by blocking the dust entrained in the ascending air towards the grid body 41,

  and deflecting it towards the swirling air stream.

  The dust blocking element 43 is mounted on the lower part of the second grid body part 41c, and comprises a first element 43a in the form of a truncated cone having a progressively increasing diameter downwards, and a second element 43b in the form of a hollow cylinder extending from the lower side of the first element 43a. The second element 43b has a predetermined length. The length of the second member 43b can be adjusted to achieve a desired dust blocking effect. In one embodiment, the second element 43b has a length between 10 and 30 mm. In a preferred example embodiment, the second

  element 43b has a length between 15 and 20 mm.

  Likewise, as shown in Figure 4, the dust blocking member 43 may be formed integrally with the grid body 41, or, as shown in Figure 5, be formed separately

of the grid body 41.

  In one embodiment where the dust blocking element 43 is formed separately, the dust blocking element 43 is fixed to the grid body 41 by a connector 45. In one embodiment, the connector 45 comprises a pair of connecting holes formed oppositely in the inner surface of the lower part of the second grid body part 41c, and a pair of connecting projections 45b formed on the outer surface of the upper part of the element dust blocking 43 which corresponds to the pair of connection holes 45a. Each of the connection holes 45a includes a position guide portion having an open bottom end, and a connection portion spaced vertically from the open bottom end of the position guide portion. The connection projections 45b are aligned with and inserted into the corresponding position guide portion of the connection holes 45a, and then rotated in a predetermined direction until the connection projections 45b are positioned in the connection portion connection holes 45a. The dust blocking member 43 is therefore assembled with the

grid body 41.

  The connector 45 can take the form of different structures in addition to the structure described above. For example, the connector 45 may comprise a threaded fastening element or else threads arranged on respective surfaces of the grid body 41 and of

  the dust blocking element 43.

  The cyclone dust collecting apparatus can be used in the canister type vacuum cleaner as described above. In operation, the suction generated at the suction brush of the vacuum cleaner draws the dust-laden air into the cyclone body 20 through the first connecting pipe 21 in a direction oblique to the body cyclone 20. Consequently, the sucked air is moved towards the lower part of the dust receptacle 30 in a swirling air stream. In this process, the dust is separated from the swirling air due to centrifugal force, and collected in the dust container 30. The air is then reflected from the bottom of the dust container 30 and moves upwards.

  a circle smaller than the downward air flow.

  The air in the ascending air stream is optionally exhausted outside the vacuum cleaner body through the air passages 42, the air outlet 24 and the second pipe.

connection 22.

  Part of the dust is entrained with the swirling air stream rising inside the dust receptacle 30, but is then blocked by the dust blocking member 43 and entrained again in the swirling air stream. Because the dust is blocked by the dust blocking member 43, it does not pass through the air passages 42 of the grid assembly 40, the dust entrained again in the swirling air stream is

  collected in the dust container 30.

  By using the dust blocking member 43 which has the improved structural features, blocking of the rising dust and its deflection to the swirling air stream is more efficiently achieved. As a result, even small particles of dust, such as hair, are blocked, so that they do not rise towards the grid body 41, but in fact fall, and are collected in the dust receptacle 30. Because the dust is retained and prevented from escaping more efficiently, the dust collection efficiency of the vacuum cleaner is

increased.

  Figures 6 and 7 are views showing a cyclone dust collection apparatus for use in a broom type vacuum cleaner according to the present invention. As shown in Figures 6 and 7, the cyclone dust collection apparatus for use in the broom type vacuum cleaner according to the present invention has a basic structure similar to that of the dust collection apparatus cyclone for use in a canister type vacuum cleaner as described above. Therefore, the cyclone dust collecting apparatus for use in the broom type vacuum cleaner according to the present invention comprises a cyclone body 200, a dust receptacle 300, and a grate assembly 400. The difference is that the cyclone dust collecting apparatus of the broom type vacuum cleaner according to the present invention is mounted in the dust collecting chamber of the vacuum cleaner body, while the dust collecting apparatus

  canister vacuum cyclone is not.

  This difference will be described in detail below.

  The cyclone body 200 includes an air inlet pipe 210 and an air outlet pipe 220. When mounting the cyclone dust collecting apparatus in the vacuum cleaner body (not shown), the air inlet pipe 210 is connected to an air inlet passage which is formed in fluid communication with a suction brush (not shown) of the vacuum cleaner body. Likewise, the air outlet pipe 220 is connected to an air outlet passage which is formed in fluid communication with a motor chamber (not shown) of the vacuum cleaner body. Consequently, the dust-laden air is sucked in from the surface to be cleaned using the suction brush. Dust-laden air then travels through the air inlet passage and the air inlet pipe 210 of the vacuum cleaner body, and then into the cyclone body 200 in a tangential direction. Therefore, a swirling air stream is formed inside the cyclone body, which causes the dust to be separated from the air sucked in by centrifugal force. Clean air is exhausted to the outside through the air outlet pipe 220, and then through the air outlet passage and the chamber

motor of the vacuum cleaner body.

  The dust receptacle 300 is detachably connected to the lower part of the cyclone body 200, in order to collect the dust separated from the air by the centrifugal force generated by the swirling current of the

body of cyclone 200.

  The grille assembly 400 is disposed at an inlet of the air outlet pipe 220 inside the cyclone body 200, preventing dust separated from

  flow through the air outlet pipe 220.

  The grille assembly 400 includes a grille body 410 in the form of a hollow cylinder with an open top end, and a plurality of air passages 420 formed on the exterior surface of the grille body 410 which place air at the outside the grid body 410 in

  fluid communication with the air outlet pipe 220.

  A dust blocking element 430 is mounted on the

  lower part of the grid body 410.

  The air passages 420 are in the form of a slot in the external surface of the grid body 410, in

  having several fins at predetermined angles.

  Although not shown, the air passages 420 may also be in the form of several through holes formed in the outer surface of the grid body 410. The fact of forming the air passages 420 in the form of a slot due to the arrangement of the fins is preferable since the slot-shaped air passages 420 can more effectively prevent the escape

  dust through air passages 420.

  The dust blocking element 430 prevents the escape of dust by blocking the dust entrained in the ascending air to the grid body 410 and by deflecting the dust in the swirling air stream. According to the present invention, the dust blocking element 430 comprises a first element 430a in the form of a truncated cone having a progressively increasing diameter downwards, and a second element 430b in the form of a hollow cylinder s extending from the lower side of the first element 430a over a

predetermined length.

  The length of the second member 430b can be adjusted to achieve a desired dust blocking effect. In one embodiment, the second element 430b has a length between 10 and 30 mm. In a preferred example embodiment, the second

  element 430b has a length between 15 and 20 mm.

  As shown in Figure 7, the dust blocking member 430 may be formed integrally with the grid body 410, or, as shown in Figure 8, be formed separately

of the grid body 410.

  In the embodiment where the dust blocking element 430 is formed separately from the grid body 410, a connector 450 is preferably used to fix the dust blocking element 430 with the grid body 410. In one form In one embodiment, the connector 450 may comprise a screw which is inserted from the lower side of the dust blocking element 430 and into the lower side of the grid body 410. However, this should not be considered as a limitation. The connector 450 can have different other structures as long as it can fix the blocking element of

  dust 430 on the grid body 410.

  In a broom type vacuum cleaner equipped with the cyclone dust collecting apparatus constructed as above, the device operates as follows. The motor in the motor chamber is driven, and suction is therefore generated by the suction brush. This suction draws the dust-laden air into the air inlet passage and the air inlet pipe 210 of the vacuum cleaner body. After passing through the air inlet pipe 210, the dust-laden air is drawn into the cyclone body 200 in an oblique direction along the inner circumference of the cyclone body 200. Therefore, a current swirling air is formed inside the cyclone body, the dust is separated from the swirling air by centrifugal force, and collected in the dust receptacle 300. Clean air is exhausted outside to

  through the air passages 420 of the grid assembly 400.

  Clean air then passes through the air outlet pipe 220, the air outlet passage and the motor chamber of the vacuum cleaner body. In this process, the dust in the rising air stream inside the dust container 300 is blocked by the dust blocking member 430, and entrained back into the swirling air stream. Since the dust is blocked by the dust blocking member 430, it cannot pass through the air passages 420 of the grid assembly 400, the dust is drawn back into the swirling air stream and collected in the receptacle of

dust 300.

  By using the dust blocking member 430 according to the present invention, blocking of the ascending dust and its deflection to the swirling air stream is more efficiently achieved. As a result, even dust in small particles, such as hair, is blocked, so that it does not rise towards the grid body 410 but falls towards the dust receptacle 300. Because the exhaust dust is retained and prevented more effectively, the dust collection efficiency of the vacuum cleaner is increased. As described above, according to the present invention, dust, including small and long particles such as hair, is effectively blocked by the dust blocking member which has the first frustoconical member and the second hollow cylindrical element and these dust particles are entrained back into the swirling air stream. Therefore, even small and long particles are prevented from rising to the grid body 410, and fall into the dust receptacle 300. Therefore, the dust exhaust is more effectively retained and prevented, and the collection efficiency of dust from the vacuum cleaner increases. According to the present invention as described above, even small and long particles such as hair are blocked by the dust blocking element which has a first frustoconical element and a second hollow cylindrical element. Therefore, the dust does not rise towards the grid body but is entrained again in the swirling air stream. As a result, the exhaust of

dust can be minimized.

  Although some preferred embodiments of the present invention have been shown and described, it is obvious to those skilled in the art that changes can be made to these embodiments without departing from the principles and spirit of

the invention.

Claims (19)

  1. Grid assembly (40, 400) of a cyclone dust collection apparatus for use in a vacuum cleaner, which is disposed at an inlet of an air outlet pipe (22, 220) d '' a cyclone body (20) o a swirling air stream is formed from dust-laden air and in which the dust is separated from the dust-laden air by the centrifugal force of the swirling air stream , the grid assembly (40, 400) intended to prevent dust from escaping being characterized in that it comprises a grid body (41, 410), several air passages (42, 420) formed on the grid body (41, 410), and a dust blocking element (43, 430) disposed at a lower portion of the grid body (41, 410), blocking dust entrained in a stream of air rising towards the grid body (41, 410) thereby deflecting the dust towards the swirling air stream, the dust blocking element era (43, 430) comprising a first element (43a, 430a) in the form of a truncated cone having a progressively increasing diameter downwards, and a second element (43b, 430b) in the form of a hollow cylinder extending vertically from a lower side of the first member (43a, 430a), and having a predetermined length.   2. Grid assembly (40, 400) according to claim 1, characterized in that the multiplicity of air passages (42, 420) is formed by a multiplicity of fins which are arranged along an outer surface of the grid body (41, 410) at a distance predetermined from each other.   3. Grid assembly (40, 400) according to claim 1, characterized in that the dust blocking element (43, 430) is detachably connected to a lower side of the grid body (41, 410) by a connector (45, 450).   4. Grid assembly (40) according to claim 3, characterized in that the connector (45) comprises: a pair of connection holes (45a) formed in an opposite manner in an internal surface of a lower part (41c) of the grid body (41), each connection hole (45a) having a position guide portion having an open bottom end and a connection portion spaced vertically from the open bottom end of the position guide portion, and a pair connecting projections (45b) formed on an outer surface of an upper side of the dust blocking member (43), the pair of projections (45b) aligning with the pair of through holes connection (45a).   5. Grid assembly (400) according to claim 3, characterized in that the connector (450) comprises a screw which is fixed from a lower side of the dust blocking element (430) to a lower side of the grid body (410).   6. Grid assembly (40, 400) according to claim 1, characterized in that the second element (43b, 430b) of the dust blocking element (43, 430) has a length between 10 and 30 mm.   7. Grid assembly (40, 400) according to claim 6, characterized in that the second element (43b, 430b) of the dust blocking element (43, 430) has a length between 15 and 20 mm.   8. Cyclone dust collection apparatus for use in a vacuum cleaner, attached to an extension hose of a canister type vacuum cleaner and configured to separate dust by swirling the air charged with dust sucked into the cyclone dust collecting apparatus, characterized in that it comprises: a cyclone body (20) comprising a first connecting pipe connected to an inlet extension pipe for sucking in air, and a second connecting pipe connected to an outlet extension pipe in order to evacuate air, a dust receptacle (30) removably mounted on the cyclone body (20), in order to collect dust separated from the dust-laden air which swirls in the cyclone body (20) by centrifugal force, and a grid assembly (40) disposed at an inlet of the second connecting pipe inside the cyclone body (20), to prevent dust separate era of escaping through the second connecting pipe, the grid assembly (40) comprising a grid body (41) having a first grid body portion (41b) having a support rib (41a) designed for engaging the cyclone body (20), and a second grid body part (41c) in the form of a hollow cylinder extending integrally from the first grid body part (41b), a multiplicity of passages d air (42) formed on the outer surface of the second grid body portion (41c) of the grid body (41), the air passages (42) placing the air outside the assembly grate (40) in fluid communication with the second connecting pipe, and a dust blocking element (43) disposed at a bottom of the second grid body (41) to block the dust entrained in a stream of air rising towards the grid body (41) so as to deflect the dust towards the swirling air stream, the dust blocking element (43) comprising a first element (43a) in the form of a truncated cone having a progressively increasing diameter downwards, and a second element (43b ) extending vertically downwards from the first element (43a),   the second element (43b) having a predetermined length.   9. cyclone dust collecting apparatus according to claim 8, characterized in that the multiplicity of air passages (42) is formed by a multiplicity of fins arranged along an outer surface of the second grid body ( 41) at a predetermined distance from each other, allowing fluid to pass between the air passages (42).   10. Cyclone dust collecting apparatus according to claim 8, characterized in that the dust blocking element (43) is detachably connected to a lower part of the second grid body (41) by a connector (45).   11. Cyclone dust collecting apparatus according to claim 10, characterized in that the connection means comprise: a pair of connection holes (45a) formed in an opposite manner in an internal surface of a lower part of the second body of grid (41), each connection hole (45a) having a position guide portion having an open bottom end and a connection portion spaced vertically from the open bottom end of the position guide portion, and a pair of projections connection (45b) formed on an outer surface of an upper side of the dust blocking member (43), the connection projections (45b) corresponding to the pair of holes connection (45a).   12. Cyclone dust collecting apparatus according to claim 8, characterized in that the second element (43b) of the dust blocking element (43) has a length between 10 and 30 mm.   13. Cyclone dust collecting apparatus according to claim 12, characterized in that the second element (43b) of the dust blocking element (43) has a length between 15 and 20 mm.   14. Cyclone dust collecting apparatus for use in a vacuum cleaner, which is mounted in a dust collecting chamber of a broom type vacuum cleaner and separates the dust from the dust laden air by swirling the laden air of dust sucked through an air inlet passage formed in fluid communication with a suction brush of the broom type vacuum cleaner, and evacuates the clean air after separation of the dust through an outlet passage d air formed in fluid communication with a motor chamber of the broom type vacuum cleaner, the cyclone dust collecting apparatus being characterized in that it comprises: a cyclone body (200) comprising a hose air inlet connected to the air inlet passage, and an air outlet pipe (220) connected to the air outlet passage, a dust receptacle (300) detachably connected to the cyclone body ( 200) to collect separate dust ée of dust-laden air which swirls inside the cyclone body (200) by centrifugal force, and a grid assembly (400) disposed at an inlet of the air outlet pipe ( 220) inside the cyclone body (200), to prevent dust separated from the dust-laden air from escaping through the air outlet pipe (220), the grille assembly (400) comprising a grid body (410) in the form of a hollow cylinder with an open upper end, a plurality of air passages (420) formed on an outer surface of the grid body (410) in communication with fluid with the air outlet pipe (220), and a dust blocking member (430) disposed at a lower portion of the second grid body (410), for blocking dust entrained in a current of air rising towards the grid body (410), and deflecting the dust towards the swirling air stream, the el dust blocking element (430) comprising a first element (430a) in the form of a truncated cone having a progressively increasing diameter downwards, and a second element (430b) extending vertically downwards from the first element (430a), the second element (430b) having a predetermined length. 15. Cyclone dust collecting apparatus according to claim 14, characterized in that the multiplicity of air passages (420) is formed by a multiplicity of fins arranged along an outer surface of the second grid body ( 410) at a predetermined distance from each other, allowing fluid to flow at through the air passages (420).   16. Cyclone dust collecting apparatus according to claim 14, characterized in that the dust blocking element (430) is detachably connected to a lower part of the grid body (410) by a connector (450).   17. Cyclone dust collecting apparatus according to claim 16, characterized in that the connector (450) comprises a screw which is fixed from a lower side of the dust blocking element (430)   to a lower side of the grid body (410).   18. Cyclone dust collecting apparatus according to claim 14, characterized in that the second element (430b) of the dust blocking element (430) has a length between 10 and 30 mm.   19. Cyclone dust collecting apparatus according to claim 18, characterized in that the second member (430b) of the dust blocking member (430) has a length between 15 and 20 mm.