JP5556056B2 - Dust collector - Google Patents

Description

  The present invention relates to a dust collector, and more particularly, to an improved dust collector so that dust attached to a filter device can be easily dropped.

  Conventional dust collectors have a motor and a dust collection fan that rotates by driving the motor inside the housing, and a dust case that collects dust and the like sucked by the rotation of the dust collection fan can be attached to the housing by a screwed structure. Placed in. The dust case is provided with a suction port for sucking dust and the like and a valve for preventing the backflow of dust sucked from the suction port. A switch for starting and stopping the motor is disposed on the upper portion of the housing. Inside the dust case, a filter device comprising a bag-shaped filter medium for filtering sucked dust and the like and a frame member made of an elastic body for fixing the bag-shaped filter medium is detachably disposed. .

  In the above structure, when the switch is turned on and the motor is started, the dust collecting fan rotates and a suction force is generated. When the worker starts the dust collection work, dust or the like sucked from the suction port adheres to the filter medium surface of the filter device, and large dust falls into the dust case. Further, if the dust collection operation is continued, the entire filter medium is covered with dust, and it becomes difficult for air to pass through the filter device, and the suction force is reduced. In that case, the operator removes the dust case from the housing and discards the dust in the dust case. In addition, the dust adhering to the filter medium of the filter device has been removed manually by labor.

  As a method for easily removing dust adhering to the filter medium of the filter device, a method disclosed in Patent Document 1 is known. In this case, a dust remover that engages with a crest provided on the filter cloth of the filter device is provided on the inner peripheral side of the filter device, and the dust remover is held by the rotating member. And a dust remover is made to contact the filter cloth surface (inner surface) of a filter apparatus by rotating a rotation member. The dust cleaner is rotated while the filter device is incorporated in the dust case. By rotating the dust remover, the dust remover repels the peak portion on the inner surface of the filter cloth, so that the dust adhering to the outer surface of the filter device can be removed. Since the dust remover is configured to be able to rotate 360 degrees around the circumference, the peak formed on the inner surface of the filter cloth can be directly repelled over the whole circumference.

JP 2000-237519 A

  Although the method according to Patent Document 1 described above can effectively remove dust adhering to the filter device, it is necessary to dispose a rotating member inside the filter device, and the diameter of the filter device is inevitably increased. End up. Therefore, although it can be easily applied to a large floor-type dust collector as disclosed in Patent Document 1, in a portable dust collector that is gripped and operated with one hand, the size of the filter device is small. It is difficult to provide such a removal mechanism.

  In addition, if such a removal mechanism is provided, it causes an increase in weight, which causes a deterioration in operability in a portable dust collector. Therefore, in the case of a portable dust collector, when throwing away dust accumulated in the dust case, the dust attached to the filter medium surface of the filter device is blown with air, or the filter medium surface is tapped lightly. The current situation is that it was removed.

  This invention is made | formed in view of the said background, The objective is to provide the dust collector which can drop the dust adhering to a filter apparatus easily.

  Another object of the present invention is to provide a dust collector that can easily remove dust adhering to the filter device simply by removing the dust case from the main housing.

  Still another object of the present invention is to provide a dust collector capable of suppressing the increase in weight and cost of the dust collector and realizing a function of removing dust attached to the filter device with a simple structure.

 Of the inventions disclosed in the present application, typical features will be described as follows.

According to one aspect of the present invention, a motor, a dust collecting fan rotated by the motor, a housing that houses the motor and the dust collecting fan, a filter device attached to the housing, and a housing so as to cover the filter device are provided. In a dust collector having a dust case that is detachably provided and stores dust sucked by a dust collecting fan between the filter device , a filter device, a filter medium, and a frame member for fixing the filter medium on an inner peripheral surface. A plurality of frame members provided in the circumferential direction of the dust case, each having a shape extending in the axial direction of the dust case, and provided with a plurality of engaging portions that can contact the frame member in the dust case, When the detachable from the housing, the engaging portion is configured to relatively move while in contact with the frame member . Also, one of the housing and dust case has a groove extending in the circumferential direction, and the other has a protrusion that can be inserted into the groove, and the dust case can be attached to and detached from the housing by rotating the housing and the dust case relatively. It was.

 According to another feature of the invention, the engaging portion is a rib-like member extending radially inward and axially from the inner wall of the dust case. A plurality of engaging portions are provided inside the dust case, and are provided at equal intervals in the circumferential direction inside the dust case. In addition, the filter device has a cylindrical cross-sectional shape in the front-rear direction, and is configured to contact the engaging portion on the outer peripheral surface of the filter device. Moreover, it is good also as a cylindrical shape which pleat-folded (bellows shape) the filter medium of the filter apparatus.

According to still another aspect of the present invention, the storage battery is mounted on the side opposite to the side where the dust case of the housings are attached. Further, the housing is provided with a grip part for an operator to hold. The filter device is attached so as to protrude from the housing, the housing is provided with a male screw, and the dust case is provided with a female screw.

According to the first aspect of the present invention, the dust case is provided with the engaging portion that is brought into contact with the filter device, and the engaging portion relatively moves while being in contact with the frame member of the filter device when the cover is detached from the housing. Therefore, dust attached to the filter device can be removed simply by attaching and detaching the dust case.

Further , since the engaging portion is a plurality of rib-shaped members extending radially inward and axially from the inner wall of the dust case, it is possible to realize a mechanism for removing dust attached to the filter device with a simple structure. it can. Furthermore, since a plurality of engaging portions are provided inside the dust case, it can be manufactured by integral molding with the dust case using synthetic resin or the like. Moreover, the rigidity of a dust case can be improved by providing an engaging part.

According to invention of Claim 2 , since an engaging part is provided in the inside of a dust case at equal intervals, it can remove dust uniformly over the wide range of a filter apparatus.

According to the invention of claim 3 , since the cross-sectional shape of the filter device in the front-rear direction is cylindrical and abuts on the engaging portion on the outer peripheral surface of the filter device, the cross-sectional area of the filter device can be increased, Dust adhering to the outer peripheral surface can be effectively removed.

According to the invention of claim 4 , the storage battery is attached to the side of the housing opposite to the side to which the dust case is attached, and the housing is provided with the grip portion for the operator to hold, so that the weight balance is good. An easy dust collector can be realized.

According to the invention of claim 5 , since the filter device is attached so as to protrude from the housing side, it is not necessary to attach the filter device to the dust case. Therefore, the engaging part for dust removal can be formed in the dust case.

  The above and other objects and novel features of the present invention will become apparent from the following description and drawings.

It is a side view of the dust collector which concerns on the Example of this invention, and the front side about half shows sectional drawing. It is sectional drawing of the dust case 3 of FIG. 4 is a rear view of the dust case 3. FIG. It is sectional drawing of the AA part of FIG. It is a figure for demonstrating the connection state of the housing 2 and the dust case 3, and is a top view of these connection parts. It is a figure for demonstrating the state after the connection of the housing 2 and the dust case 3, and is a top view of a connection part. It is sectional drawing of the dust case 3 part of the dust collector which concerns on the 2nd Example of this invention. It is sectional drawing of the BB part of FIG. It is a figure for demonstrating the connection state of the housing 32 and dust case 33 which concern on a 2nd Example, and is a top view of these connection parts. It is a figure for demonstrating the state after the connection of the housing 32 and dust case 33 which concern on a 2nd Example, and is a top view of a connection part.

  Embodiments of the present invention will be described with reference to the drawings. In the present specification, description will be made assuming that the front-rear and up-and-down directions indicate directions indicated by arrows in FIG.

  FIG. 1 is a side view of a dust collector 1 according to an embodiment of the present invention, and a front half is a cross-sectional view. The dust collector 1 is roughly divided into a housing 2 that houses a motor 4 and a dust case 3 that is attached to the front side of the housing 2. The dust collector 1 of the present embodiment is a so-called portable type that performs dust collection work while holding the main body with one hand, and a grip portion 2 a is formed on the housing 2. Inside the housing 2 are housed a motor 4 and a dust collection fan 5 attached to the rotating shaft of the motor 4.

  The motor 4 is, for example, a direct current motor, and uses a storage battery 8 attached to the rear of the housing 2 as a power source. The rotation of the motor 4 is turned on / off by a switch 15 provided in the upper part of the housing 2.

  A dust case 3 for collecting dust sucked by rotation of the dust collecting fan 5 is detachably attached to the front side of the housing 2. Although the attachment / detachment structure of the dust case 3 is arbitrary, for example, a screw-in structure may be used to fix the dust case 3 by rotating it about 45 degrees with respect to the housing 2. In addition, other known attachment / detachment structures may be used, but in the present embodiment, a structure in which the dust case 3 is attached by rotating relative to the housing 2 is preferable.

A suction port 3a for sucking dust and the like is formed on the front side of the dust case 3, and a valve 6 for preventing a backflow of dust and the like sucked from the outside is provided in the opening on the inner side of the suction port 3a. It is done. A filter device 7 is accommodated in the dust case 3. The filter device 7 has a substantially cylindrical shape. Air is passed from the cylindrical outer peripheral surface toward the inner peripheral side, and the air flows from one side in the axial direction toward the dust collecting fan 5 . The filter device 7 includes a bag-shaped filter medium 7a for filtering sucked dust and the like, and a frame member 7b for fixing the bag-shaped filter medium 7a on the inner peripheral surface, and is not on the dust case 3 side. The housing 2 is detachably attached.

  A mounting portion for the filter device 7 is formed on the front side of the housing 2 and in the vicinity of the center of the attachment surface of the dust case 3. A cylindrical mounting portion 11 protruding forward is formed near the center of the mounting portion, and a fitting portion 13 for fixing a flange 7c extending in the radial direction of the filter device 7 is formed around the mounting portion 11. A circular hole is formed in the central portion on the front side of the mounting portion 11, and this hole is in close contact with the exhaust hole formed in the filter device 7. A flange 7 c formed at the upper and lower ends of the rear side of the filter device 7 is fitted into the fitting portion 13. A dust collecting fan 5 is disposed on the rear side of the attachment portion 11. As the dust collecting fan 5, a centrifugal fan that sucks air from the front center portion and discharges it to the outer peripheral side can be used. A plurality of wind windows 14 are formed in the housing 2 in order to exhaust the air sucked by the dust collecting fan 5 from the internal space of the housing 2 to the outside.

  By operating the switch 15 and starting the motor 4, the dust collection fan 5 rotates and suction force is generated in the dust case 3, so that air containing dust and the like is sucked from the suction port 3 a of the dust case 3. The Air containing dust or the like sucked into the dust case 3 is filtered by the filter device 7. During the filtration, dust or the like remains attached to the outer peripheral surface of the filter device 7 or stays in the dust case 3 away from the filter device 7. Only the filtered air passes through the filter device 7 and flows to the dust collecting fan 5 side, and is discharged to the outside from the wind window 14 provided in the housing 2.

  FIG. 2 is a sectional view of the dust case 3 according to the embodiment of the present invention. A projection 9 is formed on the inner side of the dust case 3 so as to come into contact with the frame member 7b (see FIG. 4) of the filter device 7 when the dust case 3 is rotated relative to the housing 2 and attached or detached. The The protrusion 9 is on the inner peripheral side of the dust case 3 and is in contact with a portion having a length of about 1/3 of the central portion of the filter device 7 in the axial direction (front-rear direction). It is provided at four locations that are 90 degrees apart. The dust case 3 is formed by integral molding of plastic, for example. In the present embodiment, the protrusion 9 is molded integrally with the dust case 3. Thus, if the protrusion 9 is molded integrally with the dust case 3, it is advantageous in terms of strength, and the weight increase due to the provision of the protrusion 9 can be minimized.

  FIG. 3 is a rear view of the dust case 3 from the rear (viewed from the motor 4 side). It will be understood from FIG. 3 that the relationship between the arrangement of the protrusions 9 and the length in the radial direction. A small protrusion 3c extending in a plane perpendicular to the axial direction formed at two upper and lower portions engages with a groove 2c (see FIG. 5) provided in the housing 2, and the dust case 3 is attached to the housing 2 by a screwed structure. It is for wearing. This detachable structure will be described later.

  FIG. 4 is a cross-sectional view taken along a line AA in FIG. In FIG. 4, the protrusion 9 formed on the inner side of the dust case 3 extends in the inner circumferential direction to such an extent that it comes into contact with the filter medium 7 a when the dust case 3 is attached to the housing 2. Further, the protrusion 9 is arranged so as to be adjacent to the frame member 7b in the circumferential direction. When the dust case 3 is rotated, the protrusion 9 also rotates together with the dust case 3, so that the protrusion 9 contacts the frame member 7 b of the filter device 7. By further rotating the dust case 3 from the contacted state, the frame member 7b of the filter device 7 is twisted in the circumferential direction by the projection 9 inside the dust case 3 and deformed in the inner circumferential direction, and the projection 9 becomes the frame member 7b. It will return to its initial shape so that it can be played when overcoming. When the deformation and the returning state occur, the filter device 7 vibrates, and dust such as dust deposited on the filter medium 7a can be removed. Since this removal action is only required to attach or remove the dust case 3 to or from the housing 2 without the operator being aware of anything, a dust collector capable of easily dropping dust can be realized.

5 and 6 are top views of the connecting portion for explaining the connecting state of the housing 2 and the dust case 3. These connections can be realized by, for example, “screw fitting”. An L-shaped groove 2c is formed on the outer peripheral side of the opening 2b of the housing 2 when viewed from above. The groove 2c extends in the axial direction (front-rear direction) from the opening surface of the opening 2b, and extends in the circumferential direction from the extended tip. The length of the circumferential groove is, for example, about 45 degrees in terms of the rotation angle, and is formed so that the width of the groove at the tip is further narrowed. Protrusions 3 c indicated by the dotted line in FIG. 5 is guided in the groove 2c. Note that the attachment portion 11 that can be recognized in FIG. 5 is for attaching the filter device 7, and does not act on the attachment of the dust case 3 and the housing 2. In addition to the front air hole, the attachment part 11 is formed with an air hole 12 on the side. Air flows from these air holes to the dust collecting fan 5.

  FIG. 6 is a diagram showing the connected state, and it can be understood that the protrusion 3c of the dust case 3 is located in the groove 2c. Since the width in the axial direction (front-rear direction) of the protrusion 3c is wider than the width of the tip of the groove 2c, the rotation of the dust case 3 stops before coming into contact with the tip of the groove 2c.

  As described above, according to the present embodiment, in the dust collector that is attached and detached by screwing the dust case 3 into the housing 2 or the like, the cross-sectional shape of the filter device 7 is formed in a substantially cylindrical shape so as to contact the outer peripheral surface of the filter device. One or more elongated protrusions 9 were formed at appropriate positions inside the dust case 3. For this reason, when throwing away the dust in the dust case 3, when the dust case 3 is rotated in order to remove the screw fitting, the filter medium 7a of the filter device 7 is vibrated by the internal projection 9, and the dust on the surface is removed. . Therefore, dust removal for blowing or hitting the surface of the filter medium 7a is almost unnecessary, so that workability can be improved.

  Next, a second embodiment of the present invention will be described with reference to FIGS. FIG. 7 is a sectional view of the dust case 3 portion of the dust collector according to the second embodiment of the present invention. In FIG. 7, the filter medium 17 a of the filter device 17 has a cylindrical shape that is pleated. As a result, the peak portion of the pleat folding ridge and the projection 9 inside the dust case 3 abut on each other in the circumferential direction. In this state, the dust case 3 is rotated until it is detached from the attached state, so that the pleated filter medium 17a is twisted in the circumferential direction by the projection 9 inside the dust case 3 and deformed in the inner circumferential direction. The filter device 17 vibrates by returning to the initial shape so that the protrusion 9 of the dust case 3 is repelled when it passes over the peak of the filter medium 17a. As a result, the dust and the like adhering to the filter medium 17a of the filter device 17 can be satisfactorily removed. A method of attaching the filter device 17 to the housing 2 is the same as that of the first embodiment, and a flange 17d extending in the radial direction is formed on the housing side of the filter device 17.

  8 is a cross-sectional view taken along the line BB in FIG. As can be understood from FIG. 8, the filter device 17 is bent a plurality of times in the circumferential direction to form a ridge having a peak portion 17b and a valley portion 17c. In the example of FIG. 8, 20 crests (folds projecting toward the outer periphery) 17b and troughs (folds projecting toward the inner periphery) 17c are formed. By forming the ridges in the filter device 17 in this way, it is possible to realize a highly rigid filter device 17 that does not collapse in shape during suction without using the frame member 7b as shown in FIG.

  In the second embodiment, the configuration on the dust collector 1 side other than the filter device 17 is the same as that of the first embodiment and does not need to be changed at all. Therefore, either the filter device 7 or the filter device 17 can be used by using the same dust collector 1.

  As described above, according to the second embodiment, since the filter medium of the filter device has a pleated folded (bellows-shaped) cylindrical shape, when throwing away the dust in the dust case, rotating the dust case and removing it, The filter medium of the filter device is vibrated by the internal protrusion, and the dust on the surface is effectively removed. In addition, since the filter device has a substantially cylindrical cross-sectional shape and the filter medium is pleated (bellows-shaped), the excitation force applied to the filter medium by the protrusions inside the dust case is further increased, and the dust removal effect is further increased. .

  FIG. 9 is a view for explaining a connected state of the housing 32 and the dust case 33 according to the third embodiment of the present invention. FIG. 9 shows a top view of these connecting portions. In the first embodiment, a screw-in structure with a rotation angle of about 45 degrees is used, but in this embodiment, a screw-in structure with a rotation angle of 1 rotation or more (360 degrees or more) is adopted. Therefore, a screw thread 32 c is formed on the outer peripheral side of the opening 32 b of the housing 32, and a screw groove 33 c is formed on the inner peripheral side of the opening 33 b of the dust case 33. Since other structures including the structure of the attachment portion 11 are the same as those of the first embodiment, the description thereof is omitted.

  According to the third embodiment, since the dust case 33 and the housing 32 are screwed in at least once, the rigidity can be increased. Moreover, since the screwing rotation angle of the dust case 33 is increased, the range in which the protrusions 9 are in contact with the filter device is increased, so that the dust removal effect of the cross-sectional shape of the filter device is further increased.

  As mentioned above, although demonstrated based on the Example which shows this invention, this invention is not limited to the above-mentioned Example, A various change is possible within the range which does not deviate from the meaning. For example, the protrusion 9 protruding inside the dust case 3 is not limited to extending only in the radial direction, and may extend in any other direction. For example, a protrusion may be configured to extend in the axial direction from the front side of the inner wall of the dust case 3, and the protrusion may be in contact with a part of the filter medium of the filter device.

  Further, the protrusion 9 extending inside the dust case 3 is formed into a rib shape (annular member) extending in the direction perpendicular to the axial direction and continuing in the circumferential direction, and when the dust case 3 is pulled away from the housing 2 forward. The rib-shaped portion may be configured to move while contacting the outer periphery of the filter device 7.

DESCRIPTION OF SYMBOLS 1 Dust collector 2 Housing 2a (Housing) Grip part 2b (Housing) opening 2c (Housing) groove 3 Dust case 3a (Dust case) Suction port 3b (Dust case) opening 3c (Dust case) protrusion
4 Motor 5 Dust collector fan 6 Valve 7 Filter device 7a Filter material 7b (Filter device) Frame member 7c (Filter device) Flange 8 Storage battery 9 Protrusion 11 Mounting portion 12 Air hole 13 Fitting portion 14 Air window 15 Switch 17 Filter device 17a Filter material 17b (Filter device) Mountain 17c (Filter device) Valley 17d (Filter device) Flange 32 Housing 32b (Housing) Opening surface 32c (Housing) Thread 33 Dust case 33b (Dust case) opening 33c (Dust case) screw groove

Claims (5)

A motor, a dust collecting fan rotated by the motor, a housing for housing the motor and the dust collecting fan, a filter device attached to the housing, and a detachable attachment to the housing so as to cover the filter device A dust collector for storing dust sucked by the dust collecting fan between the filter device and a dust collector,
The filter device includes a filter medium and a frame member for fixing the filter medium on an inner peripheral surface, and a plurality of the frame members are provided in a circumferential direction of the dust case, each of which is an axial direction of the dust case. With a shape extending to
The dust case is provided with a plurality of engaging portions that can come into contact with the frame member ,
The engaging portion is a plurality of rib-shaped members extending radially inward and axially from the inner wall of the dust case, while contacting the frame member when the dust case is attached to and detached from the housing. Move relatively,
One of the housing and the dust case has a groove extending in the circumferential direction, the other has a protrusion that can be inserted into the groove, and the dust case is rotated by relatively rotating the housing and the dust case. A dust collector detachable from the housing. The dust collector according to claim 1, wherein the frame member and the engaging portion are provided at equal intervals inside the dust case. Dust collector of claim 2 wherein the filter device, wherein the longitudinal sectional shape is cylindrical. A storage battery is attached to the side of the housing opposite to the side on which the dust case is attached,
The dust collector according to any one of claims 1 to 3 , wherein a grip portion for an operator to hold is provided in the housing. The dust collector according to any one of claims 1 to 4 , wherein the filter device is attached so as to protrude from the housing.

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