JP2007190416A - Vacuum cleaner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vacuum cleaner facilitating the removal of dust attached to a filter. <P>SOLUTION: This vacuum cleaner 1 is provided with a suction port body 2 sucking dust from a cleaning face, a dust storage part 7 storing the dust sucked form the suction port body 2, and an electric blower 8 generating a suction air flow, the dust storage part 7 is disposed in the upstream side of the electric blower 8 relative to the suction air flow, an interval between the dust storage part 7 and the electric blower 8 is provided with the filter 24, and the filter 24 is constituted of a metal plate having a flat surface and having a plurality of through-holes formed of minute openings. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electric vacuum cleaner, and more particularly to an improvement of a filtration filter that removes dust from a suction airflow.

  Conventionally, a filtration filter that removes dust from a suction airflow of a vacuum cleaner is generally formed of a nonwoven fabric. Since such a nonwoven fabric is a finely breathable material in which fibers are woven, dust that cannot pass through the eyes can be removed from the airflow.

  In recent years, there has been an increasing demand for vacuum cleaners that generate eddy currents in airflow and remove dust from the airflow by centrifugal force. In such a vacuum cleaner, when the dust is centrifuged by the air flow and the separated dust is stored in the storage unit, a non-woven fabric filter is provided in the storage unit, and only the air flow is discharged from the storage unit, A technique capable of compressing dust stored by an air current is known. (For example, see Patent Document 1)

Japanese Patent No. 3365410

  However, since the nonwoven fabric is formed by weaving fibers, there are irregularities due to the fibers on the surface, and dust is entangled with these irregularities, so even if the filtration filter is cleaned during dust treatment, it can be easily removed There was a problem that I could not. Further, when the airflow passes through the nonwoven fabric, fine dust has entered the depth of the fiber, and it has been further difficult to remove the dust that has entered the depth of the fiber.

  Also, in the configuration where the stored dust is compressed by the airflow, the dust is pressed against the filter, the difficulty of removal increases further, the power consumption increases due to clogging of the filter, and the cleaning efficiency deteriorates. is expected.

  Furthermore, the nonwoven fabric may generate static electricity, and when static electricity is generated, dust may be attracted to the nonwoven fabric surface. In particular, when airflow passes through the nonwoven fabric, friction with air occurs, and it is difficult to substantially prevent static electricity generated here.

  As described above, in the conventional vacuum cleaner, the removal of dust adhering to the filtration filter is an indispensable work for cleaning efficiency, ensuring the suction air volume of the vacuum cleaner, etc. There was nothing that had enough sex. In addition, if the filtration filter is not sufficiently cleaned, it may be considered that even if dust is removed from the filter, sufficient cleaning efficiency and the amount of air sucked by the vacuum cleaner are not restored.

  This invention is made | formed in view of the said subject, and it aims at providing the vacuum cleaner which can remove easily the dust adhering to the filtration filter.

  In order to achieve the above object, an electric vacuum cleaner according to the present invention includes a suction body that sucks dust from a cleaning surface, a dust storage section that stores dust sucked from the suction body, and an electric blower that generates a suction airflow. A dust storage part is arranged on the upstream side of the electric blower with respect to the suction airflow, and a filtration filter is provided between the dust storage part and the electric blower. It is comprised by the metal plate provided with the several through-hole which consists of various opening.

  According to the electric vacuum cleaner of the present invention, the cleaning property of the filtration filter is improved, and it is possible to easily remove dust attached to the filtration filter.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described in detail as an example. FIG. 1 is an overall perspective view of a vacuum cleaner according to an embodiment of the present invention. The vacuum cleaner 1 shown in the figure is a pipe that communicates with a suction port 2 (not shown) formed on a contact surface side of a suction body 2 that sucks dust from a cleaning surface such as a floor surface and a cleaning surface of the suction body 2. 3, a hose 4 communicating with the pipe 3, and a cleaner body 5 connected to the hose 4.

  FIG. 2 is a longitudinal sectional view of the main body 5 taken along the line AA in FIG. As shown in the figure, the main body 5 is formed with a connection port 6 for connecting the hose 4. Inside the main body 5, there is a dust storage portion 7 that communicates with the connection port 6 and stores dust sucked from the suction body 2, and an electric blower 8 that generates a suction airflow. The outline of the main body 5 includes an upper case 9 that forms a substantially rear half of the upper portion of the main body, a lower case 10 that forms a lower portion of the main body, and a lid 11 that covers the front half of the upper portion of the main body so as to be rotatable with respect to the upper case 9. Has been.

  FIG. 3 is a perspective view of the main body 5 of the vacuum cleaner 1 in the present embodiment. When the lid 5 is opened, the main body 5 of the vacuum cleaner 1 in the present embodiment accommodates a dust collection case 12 that is a dust storage unit 7 therein. The dust collection case 12 is configured to be detachable from the dust collection case housing portion 13 inside the main body 5.

  FIG. 4 is a top sectional view of the case body 12 taken along the line BB in FIG. As shown in the figure, the dust storage part 7 of the vacuum cleaner 1 in the present embodiment is formed by a dust collecting case 12, and the dust collecting case 12 receives a suction air flow including dust sucked from the suction body 2. The separation chamber 14 is rotated and centrifuged, and the storage chamber 15 stores dust separated from the suction airflow in the separation chamber 14.

  The separation chamber 14 has a substantially cylindrical shape, and when the dust collection case 12 is set in the dust collection case housing portion 13 as shown in FIG. 2, the connection port 6 is connected above the center line of the separation chamber 14. Then, the connection is made while preventing air leakage through the packing 16 so that the airflow is introduced from the end in the tangential direction of the connection port 6 and the cylinder of the separation chamber 14. In addition, a substantially cylindrical first intake portion 17 that discharges a swirling airflow for centrifuging dust contained in the airflow is provided in the central portion of the separation chamber 14. As shown in FIG. 3, the first intake portion 17 is covered with a mesh-like filter 18 for preventing intrusion of large dust. The cyclone cap 19 that forms the suction airflow path having the first intake portion 17 is detachable from the dust collecting case 12 via a seal member 20 as shown in FIGS. With such a configuration, when a suction airflow containing dust is introduced into the dust collecting case 12 from the connection port 6, a swirling airflow is generated in the separation chamber 4, and only dust is separated by centrifugal force, and the dust is contained. The air flow that is not present is introduced from the filter 18 into the cyclone cap 19 and is sucked into the electric blower 8.

  As shown in FIG. 4, the separation chamber 14 and the storage chamber 15 are shifted in position so that the introduction port 21 through which dust is introduced into the separation chamber 14 and the axis thereof are shifted, and the dust discharge port 22 is separated from the separation chamber 14. Are provided so as to be in a substantially horizontal direction with the tangential direction of the cylinder. Thereby, the dust centrifuged by the swirling airflow generated in the separation chamber 14 is discharged into the storage chamber 15 from the dust discharge port 22 by centrifugal force while rotating. Further, a second intake portion 23 communicating with the electric blower 8 is provided inside the storage chamber 15. For this reason, a part of the sucked airflow is also introduced into the storage chamber 15 from the dust discharge port 22 and is sucked into the electric blower 8 while compressing the dust stored in the storage chamber 15.

  In the vacuum cleaner 1 according to the present embodiment, a dust collection case 12 that is a dust storage unit 7 is disposed in the second air intake unit 23 on the upstream side of the electric blower 8 with respect to the suction airflow. A filtration filter 24 is provided between the electric blowers 8. And the filtration filter 24 is comprised with the metal plate with which the surface was flat and the several through-hole which consists of minute openings was provided. The filtration filter 24 has a hole in the metal plate and has a shape with almost no irregularities on the surface, so that dust that cannot pass through the eyes of the filter is not easily caught by the irregularities on the filter surface and can be easily removed. Will be able to. In addition, since metal has a smaller coefficient of friction than non-woven fabric and the like, it is possible to more easily remove the attached dust. The size of the hole formed in the metal plate should be as small as possible. However, if it is too small, the relative opening area will increase, the strength of the metal plate will be weak, and if it is too large, it will be sufficient as a filter. Since the function cannot be exhibited, φ0.01 mm to φ1.5 mm, and further φ0.1 mm to φ1.0 mm are optimal.

  By forming the filtration filter 24 with a metal plate in this way, not only the above-described effects of the shape but also the metal does not cause non-uniformity in the internal charge distribution, so static electricity is not generated. Even if it is placed in the suction airflow, static electricity is not generated due to friction with air, and the attached dust is not sucked electrically, so that it can be easily removed. Further, it is possible to prevent the dust from entering deep into the fiber as in the case of the nonwoven fabric, and it is possible to easily remove the dust from this point. Since the filtration filter 24 is formed of metal in this way, the cleanability of the filter can be remarkably improved, and the suction air volume of the cleaner can be easily secured by cleaning the filter.

  Moreover, in this embodiment, the dust storage part 7 is formed by the dust collection case 12, and the dust collection case 12 rotates the suction airflow containing the dust sucked from the suction body and rotates and separates the separation chamber. The chamber 14 has a storage chamber 15 for storing dust separated from the suction airflow. The separation chamber 14 has a first intake portion 17 that communicates with the electric blower 8, and the storage chamber 15 communicates with the electric blower 8. The second intake portions 23 are provided, and the filtration filter 24 is disposed at least in the second intake portion 23. Since it is formed in this way, a part of the suction airflow is sucked into the electric blower 8 from the second air intake portion 23 and is stored in the storage chamber 15 in the filtration filter 24 made of metal. Since dust can be compressed in the storage chamber 15, more dust can be stored in the storage chamber 15. When the dust is compressed and stored in this manner, the dust is pressed against the filtration filter 24 described above. However, even if the dust is pressed against the filtration filter 24, the dust attached to the filtration filter 24 is removed. It is easy to drop, and the cleanability of the filter 24 is not deteriorated.

  Moreover, if it is such a form, the following effects can also be show | played. FIG. 5 is an explanatory view schematically showing a suction airflow inside the dust collecting case 12 of the electric vacuum cleaner in the present embodiment. As shown in the figure, in the present embodiment, when the electric blower 8 is operated, a suction air flow 25 containing dust from the cleaning surface passes through the suction body 2, the pipe 3, and the hose 4, and the dust collecting case inside the main body 5. 12 is introduced. The suction airflow 25 introduced into the separation chamber 14 of the dust collecting case 12 generates a swirling airflow in the separation chamber 14 and dust is separated by centrifugal force, and a part 26 of the suction airflow is provided in the first intake portion 17. It passes through the mesh-shaped filter 18 and passes through the cyclone cap 19 and is sucked into the electric blower 8. The remaining suction airflow 27 is introduced into the storage chamber 15, passes through the filter 24 while compressing the dust stored in the storage chamber 15, and is also sucked into the electric blower 8. Even if a large amount of dust accumulates in the storage chamber 15, there are two paths through which the sucked airflow is sucked into the electric blower 8, so that even if the sucked airflow 27 is accumulated, the dust is sufficient. Even if the strength cannot be secured, the airflow can flow to the suction airflow 26 side, so that even if the amount of stored dust becomes large, the suction airflow of the cleaner is relatively difficult to drop. It is possible to obtain a good cleaning output at any time.

  In the present embodiment, as shown in FIG. 4, a urethane filter 29 is attached to the air flow outlet 28 of the cyclone cap 19 and the second intake portion 23 after passing through the filtration filter 24. The urethane-based filter 29 is configured to filter both airflow from the first air intake portion 17 and the second air intake portion 23. Therefore, it is possible to collect fine dust that has passed through the mesh filter 18 covered by the first air intake portion 17 and fine dust that has passed through the filter 24 installed in the second air intake portion 23, and normal dust Is collected by the mesh filter 18 and the filtration filter 24, and the fine dust that has passed therethrough is collected by the urethane filter 29 to prevent the dust from entering the electric blower 8.

  Further, as shown in FIG. 3, a pleated electrostatic filter 30 is attached to a portion of the cleaner body 5 through which the airflow that has passed through the urethane filter 29 passes. By collecting the ultrafine dust that has passed through the filter 29, a collection rate of approximately 99% can be secured. Thus, by dividing the role of each filter type, the cleaning frequency of each filter can be set for each filter. That is, the cleaning frequency of the filter that collects large dust can be set high so that maintenance can be performed when dust is discharged. And if such a filter with high cleaning frequency is comprised by the filtration filter 24, the cleaning property of troublesome filter cleaning can be improved and the usability of the cleaner itself can be improved.

  In the present embodiment, the filtration filter formed of metal is described in the form of only the filtration filter 24 provided in the second air intake portion 23, but the present invention is not limited to this, for example, a mesh-like filter 18, a urethane filter 29, and an electrostatic filter 30 may be provided with a metal plate filter with each eye size adjusted, and if formed in this way, the cleaning performance of any filter can be improved. Therefore, it is possible to improve the usability of the vacuum cleaner itself.

  FIG. 6 is a perspective view for explaining the configuration of the dust collecting case 12 in one embodiment of the present invention. As shown in FIG. 3A, in the vacuum cleaner 1 according to the present embodiment, the dust outlet 30 for discharging the dust stored in the storage chamber 15 in the dust collecting case 12 and the dust outlet 30 can be opened and closed freely. An attached lid 31 is provided. As shown in FIG. 6B, the lid 31 is provided with a filtration filter 24 on the side facing the storage chamber 15 and a urethane filter 29 on the back side thereof. 31 is provided. Moreover, the air flow outlet 28 of the cyclone cap 19 is also provided integrally with the lid 31 in the present embodiment.

  The lid 31 is provided with a packing 32 around it. By rotating at the lower part of the dust collecting case main body 33, the dust outlet 30 can be closed airtightly by the packing. . A holding member 34 is provided on the top of the lid 31, and the holding member 34 is closed and held by a claw member 35 attached to the upper part of the dust collection case main body. The claw member 35 moves up and down with the pressing of the button 36 so that the holding member 34 can be held and released. When dust accumulates inside the storage chamber 15 of the dust collection case 12 by such a configuration, the dust collection case 12 is removed from the main body 5 and the button 36 is pushed on the trash can etc., so that the claw member is moved downward. The holding member 34 is detached from the claw member 35 by operating. When the dust collecting case 12 is tilted on the trash box, the lid 31 is opened by gravity as shown in FIG. 7, and at the same time, the dust is discharged to the outside. As described above, the dust collecting case 12 in the present embodiment can be disposed of with a single touch by simply pressing the button 36 and tilting the case 12 to a trash box or the like. Further, when the dust inside the storage chamber 15 is thrown away, the filtration filter 24 is disposed on the side of the lid 31 of the dust collecting case 12 facing the storage chamber 15, so that the dust accumulated in the storage chamber 15 is removed. The configuration is such that it can be easily discarded, and even if dust adheres to the filter 24, it can be easily removed.

  Furthermore, in the dust collection case 12 in this embodiment, the filtration filter 24 is detachably attached to the lid 31 as shown in FIG. In this way, the filtration filter 24 is detachably attached to the lid 31. Since the filtration filter 24 is made of metal, for example, when the filtration filter 24 is clogged, the flow path of the air flow is It is conceivable that pressure loss will occur and the suction force will decrease due to the blockage, but if the dust is attached to the filtration filter 24 and the dirt is severe, the filtration filter 24 is removed from the lid 31, It can be washed as it is, and dust can be removed more easily. In addition, when the water is washed in this way, static electricity is not generated in the filter 24 itself, but even when static electricity is generated in the dust, it is discharged by being put on water, and is better removed from the dust filter. Removal is easy. Thus, by removing the filtration filter 24 from the lid 31, washing with water and the like can be easily performed, and the cleanability is improved.

  If stainless steel is used as the material for the metal plate constituting the filtration filter 24, the rust prevention and corrosion resistance will be good, and even if the maintenance after washing with water is insufficient, the filtration filter 24 is less likely to rust. For example, it is possible to maintain good quality over a long period of time without causing problems such as rusting and blocking through holes provided in the filtration filter 24.

  FIG. 8 is a perspective view of the filtration filter 24. As shown in FIG. 2A, the filtration filter 24 in the present embodiment includes a filter part 37 made of a metal plate when viewed from the front side, and a resin frame formed on the edge of the filter part 37. As shown in FIG. 8 (b), the body 38 is formed of a resin reinforcing rib 39 provided on the downstream surface of the suction airflow of the filter portion 37 when viewed from the back side. With such a configuration, even if the filter portion 37 formed of a metal plate is thin, sufficient strength can be provided, and the weight of the filter itself can be reduced. In particular, since the dust is pressed against the upstream surface of the filter portion 37, the frame body 38 provided around the filter portion 3 and the reinforcing rib 39 present on the back surface have sufficient strength, and the dust is pressed. It is possible to provide strength that can withstand the pressure applied. Since the reinforcing rib 39 is provided on the downstream surface of the filter portion 37 with respect to the sucked airflow, even if dust is pressed against the filter portion 37, the surface of the filter portion 37 is flat. It is easy to remove dust adhering to the portion 37. The reinforcing rib 39 can be reinforced to prevent deformation without affecting the dust from the filter portion 37.

  In the present embodiment, the urethane filter 29 provided on the downstream side of the suction airflow of the lid 31 also includes the frame and the reinforcing rib provided on the downstream side of the suction airflow. The reinforcing body 40 and the filter portion 41 which are also received integrally are formed. FIG. 9 is a perspective view of the urethane filter 29 in this embodiment. As shown in FIG. 2A, in this embodiment, the urethane-based filter portion 41 is used by being fitted into a reinforcing body 40 provided with a frame body and reinforcing ribs. As shown in FIG. 9B, the reinforcing body 40 is provided with a claw portion 42 for holding and fixing the urethane-based filter portion 41 at the airflow outlet 28 and the second air intake portion 23, and the lid body 31. Removably attached to. In addition to being able to hold the urethane filter part 41 well against the airflow by such a configuration, for example, when the eyes are clogged with fine dust that has passed through the filtration filter 24, the urethane filter part 41 is removed to remove dust. Removal can be performed, and cleaning properties are improved. Further, when the clogging of the urethane filter 41 is severe and the dust cannot be sufficiently removed even after cleaning the filter, it is possible to secure the original suction air volume by replacing only the urethane filter 41. Therefore, maintainability can also be improved.

  By the way, the plurality of through holes formed in the filter portion 37 forming the filtration filter 24 may have different opening diameters on the upstream side and the downstream side with respect to the suction airflow. FIG. 10 is a cross-sectional view of the filter portion 37. As shown in FIG. 5A, the through hole 42 provided in the filter portion 37 has the same size on the upstream side and the downstream side with respect to the suction airflow. Even in such a form, it can sufficiently serve as a filter.

  On the other hand, as shown in FIG. 10 (b), the plurality of through holes 43 made of minute openings provided in the metal plate that is the filter portion 37 have a diameter relationship of the through holes upstream of the suction airflow. The hole diameter of the through hole on the side and the hole diameter of the through hole on the downstream side are different from each other, and the cross-sectional shape of the through hole is formed in a tapered shape with respect to the airflow passing through. When formed in this way, the flow velocity of the airflow flowing through the through hole can be manipulated to some extent, and adjustment can be made so that an airflow suitable for the portion where the filter 24 is provided is obtained.

  In particular, in such a form, when the hole diameter of the through hole 43 is formed such that the hole diameter φd of the upstream through hole 43 <the hole diameter φD of the downstream through hole 43, the metal plate of the downstream filter portion 37 The angle of the edge portion 44 becomes larger. When the airflow flows from a narrow place to a wide space, if the angle of the edge portion 44 is small, a turbulent flow is generated in the vicinity of the edge portion 44 and the airflow becomes difficult to flow. Thus, by making the angle of the edge portion 44 as smooth as possible, turbulent flow can be suppressed, airflow can easily flow, and reduction of suction force can be suppressed.

  In addition, when forming the through-hole which has such a fine opening diameter in a metal plate, it is good to form by an etching process. When such a through hole is processed by, for example, a press method, it is very difficult to form a very small hole. When the hole diameter is large, dust passes and the filter effect is lost. In addition, it is conceivable that a failure such as through-holes connecting to each other due to a load during pressing, a burr or the like, and a dust becoming easily entangled with the burr may occur. On the other hand, if the through hole is formed by etching, the surface has no burrs and can be processed with almost no unevenness, the diameter of the through hole can be easily adjusted, and the edge portion is also formed smoothly. It is also possible to do.

Embodiment 2. FIG.
In the above-described embodiment, a cyclone type vacuum cleaner having a dust collecting case has been described as an example. However, the present invention is not limited to this configuration, and for example, dust sucked from a mouthpiece is stored. A filter provided with a metal plate provided with a plurality of through holes each having a flat surface between a paper pack-type dust storage section and an electric blower that generates a suction airflow. A plurality of through-holes each having a flat surface and a small opening are provided between a dust storage portion formed of a simple space for storing dust sucked from the suction body and an electric blower for generating a suction airflow. It is also possible to provide a filtration filter made of a metal plate. Even if the above-described filtration filter is used in such a vacuum cleaner, the filter filter is improved in cleanability, and the filtration filter It is possible to easily drop dust adhering to the chromatography.

It is the whole vacuum cleaner perspective view in one embodiment of the present invention. It is a longitudinal cross-sectional view of the main body in the AA straight line in FIG. It is a perspective view of the main body of the vacuum cleaner in one Embodiment of this invention. FIG. 4 is a top cross-sectional view of the case body taken along the line BB in FIG. 3. It is explanatory drawing which showed typically the suction | inhalation airflow inside the dust collection case of the vacuum cleaner in one Embodiment of this invention. It is a perspective view for demonstrating the structure of the dust collection case 12 in one Embodiment of this invention. It is the perspective view which showed the mode at the time of garbage disposal of the vacuum cleaner in one Embodiment of this invention. It is a perspective view of the filtration filter in one embodiment of the present invention. It is a perspective view of the urethane type filter in one embodiment of the present invention. It is sectional drawing of the filter part 37 in one Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Vacuum cleaner, 2 suction body, 3 pipe, 4 hose, 5 Vacuum cleaner main body, 6 Connection port, 7 Dust storage part, 8 Electric blower, 9 Upper case, 10 Lower case, 11 Lid, 12 Dust collection case, 13 Dust collection case accommodating portion, 14 separation chamber, 15 storage chamber, 16 packing, 17 first air intake portion, 18 mesh filter, 19 cyclone cap 20 sealing material, 21 introduction port, 22 dust discharge port, 23 second air intake portion, 24 filtration filter, 25 suction airflow, 26 part of suction airflow, 27 remaining suction airflow, 28 airflow outlet, 29 urethane filter, 30 electrostatic filter, 31 lid, 32 packing, 33 dust collection case body, 34 holding Member, 35 claw member, 36 button, 37 filter part, 38 frame, 39 reinforcing rib, 40 reinforcing body, 41 Urethane filter part, 42 through hole, 43 through hole, 44 edge part.

Claims (9)

A suction body for sucking dust from the cleaning surface, a dust storage part for storing dust sucked from the suction body, and an electric blower for generating a suction airflow,
A dust storage part is arranged on the upstream side of the electric blower with respect to the suction airflow, and a filtration filter is provided between the dust storage part and the electric blower,
The vacuum filter is constituted by a metal plate having a flat surface and provided with a plurality of through holes made of minute openings. The dust storage part is formed by a dust collecting case;
The dust collection case has a separation chamber that rotates and centrifuges the suction airflow containing dust sucked from the suction body, and a storage chamber that stores the dust separated from the suction airflow in the separation chamber,
The separation chamber is provided with a first intake portion communicating with the electric blower, and the storage chamber is provided with a second intake portion communicating with the electric blower,
The vacuum cleaner according to claim 1, wherein the filtration filter is disposed at least in the second air intake portion. The storage chamber is provided with a dust outlet for discharging the stored dust, and a lid attached to the dust outlet so as to be freely opened and closed.
The vacuum cleaner according to claim 2, wherein the second intake portion is provided on the lid.   The electric vacuum cleaner according to any one of claims 1 to 3, wherein the filtration filter is detachably attached.   The vacuum cleaner according to any one of claims 1 to 4, wherein the filtration filter is formed by etching.   The filtration filter includes a filter portion made of a metal plate, a frame formed at an edge of the filter portion, and a reinforcing rib provided on a downstream surface of the suction airflow of the filter portion. The vacuum cleaner according to any one of claims 1 to 5, wherein the vacuum cleaner is formed.   The vacuum cleaner according to any one of claims 1 to 6, wherein stainless steel is used as a material of the metal plate constituting the filtration filter.   The plurality of through-holes made of the minute openings provided in the metal plate have different sizes of the through-holes depending on the diameter of the upstream through-hole and the downstream through-hole with respect to the suction airflow. The vacuum cleaner according to any one of claims 1 to 7, wherein the vacuum cleaner is formed in a tapered shape with respect to an airflow passing through a cross-sectional shape of the through hole. The diameter of the through hole is
The vacuum cleaner according to claim 8, wherein the diameter of the through hole on the upstream side is smaller than the diameter of the through hole on the downstream side.

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