WO2017056400A1

WO2017056400A1 - Dust collecting device

Info

Publication number: WO2017056400A1
Application number: PCT/JP2016/004042
Authority: WO
Inventors: 雅巳中根; 健吾中原
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2015-09-30
Filing date: 2016-09-05
Publication date: 2017-04-06
Also published as: JP2017064863A; JP6890290B2

Abstract

In the present invention, a vortex flow generating unit 30 causes dust-containing air which has flowed in from an inflow port to swirl, thereby centrifuging the dust. A dust collection unit 80 collects the dust which has been centrifuged by the vortex flow generating unit 30. A connecting section 34 connects a discharge port 42 of the vortex flow generating unit 30 and an opening 86 of the dust collection unit 80. In the dust collection unit 80, a second swirl acceleration unit 88 causes air which contains dust and has flowed in from the opening 86 through the connecting section 34 to swirl, and a dust collection chamber 84 stores the dust which has been centrifuged by the second swirl acceleration unit 88. A dust collecting device 20 is provided with a return route 82 for returning to the vortex flow generating unit 30 the air which has flowed into the dust collection unit 80.

Description

Dust collector

The present invention relates to a dust collector, and more particularly to a dust collector suitable for a power tool such as a drill driver.

Conventionally, a dust collector that separates and collects dust by swirling air containing dust is known. For example, Patent Document 1 discloses a cyclone-type dust suction device that centrifugally separates dust in a dust suction case by causing dust suction wind generated by rotation of a dust suction fan to flow into the dust suction case and turning the dust suction wind. The dust suction device disclosed in Patent Document 1 is attached to an electric tool used for drilling work and sucks dust generated from the tip of a drill bit.

JP 2007-61977 A

In the dust collector, dust that has been centrifuged by swirling air containing dust is collected in the dust collection chamber, but dust that could not be centrifuged is collected by a filter and discharged to the outside. Is prevented. If the collection efficiency by centrifugation is poor, the amount of dust collected by the filter increases, and the filter becomes clogged in a short time. When the filter is clogged, the operator needs to interrupt the work using the electric tool for the maintenance and replacement of the filter, and the work efficiency is lowered.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a dust collecting device with improved dust collection efficiency by centrifugal separation.

In order to solve the above-described problems, a dust collector according to an aspect of the present invention includes a vortex generating unit that rotates dust-containing air flowing from an inflow port to centrifuge dust, and dust that has been centrifuged by the vortex generating unit. A dust collection unit that collects the dust, a discharge port of the eddy current generation unit, and a connection portion that connects an opening of the dust collection unit. The dust collection unit has a swirl promoting unit that swirls air containing dust flowing in from an opening of the dust collecting unit through the connection part, and a dust collection chamber that stores dust centrifuged by the swirl promoting unit.

It should be noted that an arbitrary combination of the above-described components and a conversion of the expression of the present invention between a method, an apparatus, a system, a recording medium, a computer program, and the like are also effective as an aspect of the present invention.

It is a figure which shows the perspective view of the dust collector attached to the electric tool. It is a figure which shows the left view of a drill driver and a dust collector. It is a partial cross section figure which shows the partial cross section of a dust collector with front view. It is a partial cross section figure which shows the partial cross section of a dust collector with a perspective view. FIG. 4 is a cross-sectional view taken along the line AA of the dust collector shown in FIG. 3. It is a figure for demonstrating the motion of dust. It is a figure which shows an example of the inflow port of a return path | route. It is a figure which shows another example of the AA cross section of the dust collector shown in FIG. It is a figure for demonstrating the flow of air.

FIG. 1 shows a perspective view of a dust collector attached to an electric tool. The electric power tool is a drill driver 1 for cutting concrete or the like, and the dust collector 20 of the embodiment absorbs dust generated in a cutting operation using the drill driver 1.

The drill driver 1 includes a trunk portion 2 in which a drive mechanism such as a motor is built, and a grip portion 3 that is gripped by an operator. An auxiliary handle 4 that is gripped by an operator is attached to the body 2. For example, the operator can stabilize the posture of the drill driver 1 during driving by holding the grip portion 3 with the left hand and holding the auxiliary handle 4 with the right hand.

The grip portion 3 has a switch 8 operated by an operator at a front position below a connection portion with the trunk portion 2. A battery pack 5 is attached to the lower end of the grip 3. The motor built in the body portion 2 is driven by receiving power supply from the battery pack 5. The amount of operation of the switch 8 by the operator controls the rotational speed of the motor.

At the front end portion of the barrel portion 2, a chuck 6 to which a tip tool can be attached and detached is provided. For example, a drill bit 7, which is a tip tool, is fixed to the chuck 6, and the drill bit 7 rotates when the motor rotates. During the concrete cutting operation by the drill bit 7, a large amount of dust is generated from the tip of the drill bit 7. The dust collector 20 according to the embodiment has a function of sucking generated dust and collecting the dust by a centrifugal separation action. Although FIG. 1 shows a rechargeable drill driver 1 as an example of an electric tool, the electric tool to which the dust collector 20 can be attached may be another type of electric tool that generates dust during work. Alternatively, it may be driven by receiving power supply from an external power supply device.

The dust collector 20 includes an eddy current generating unit 30 that circulates dust-containing air (dust-containing air) and centrifugally separates the dust, a drive unit 60 that makes the inside of the eddy current generating unit 30 a negative pressure, and an eddy current generating unit. A dust collecting unit 80 for collecting the dust centrifuged at 30 is provided. The dust collecting unit 80 is fixed to the eddy current generating unit 30 by a ring-shaped fastener 28. The vortex generating unit 30 and the dust collecting unit 80 are connected by a connecting portion 34 that is a communication channel. The dust collecting unit 80 and the vortex generating unit 30 are connected by a return path 82 that is a communication channel. As described above, the connection portion 34 and the return path 82 form a circulation path for circulating air between the vortex generating unit 30 and the dust collecting unit 80.

In a state where the dust collector 20 is attached to the drill driver 1, the tip portion of the dust suction nozzle 22 configured in an L shape by the suction nozzle 22 a and the connection nozzle 22 b is directed toward the tip of the drill bit 7. Specifically, an encircling member 22c surrounding the periphery of the drill bit 7 is provided at the tip of the suction nozzle 22a, and the encircling member 22c prevents the dust generated from the drill bit 7 from being scattered. Suck into the dust collector 20 side. The rear end portion of the suction nozzle 22a is connected so as to be substantially perpendicular to the front end portion of the connection nozzle 22b. The rear end side of the connection nozzle 22b is accommodated in the holding collar 24 so as to be able to advance and retreat. The holding collar 24 is fixed to the body 2 of the drill driver 1 by a fastener 27.

FIG. 2 shows a left side view of the drill driver 1 and the dust collector 20. FIG. 2 shows a state where the drive unit 60 is attached to the drill driver 1 by the

attachment members

26a and 26b. The means for attaching the dust collector 20 to the drill driver 1 is not limited to the attachment member 26 and may be attached by other means.

The connecting nozzle 22b is accommodated so as to be able to advance and retreat with respect to the holding collar 24. The rear end portion of the connection nozzle 22b is urged in the holding flange portion 24 in a direction toward the front by, for example, a spring member. During the cutting operation, when the drill bit 7 drills a workpiece such as concrete and enters the workpiece, the surrounding member 22c of the dust suction nozzle 22 hits the workpiece. At this time, the surrounding member 22c is pushed back from the workpiece in the direction opposite to the direction in which the drill bit 7 enters, and the connecting nozzle 22b moves backward with respect to the holding collar 24. When the drill bit 7 is removed from the workpiece after the cutting operation is completed, the connecting nozzle 22b is pushed out by the spring member in the holding collar 24, and the surrounding member 22c is moved around the tip of the drill bit 7. Will be placed.

Although not shown in FIG. 2, the flange end 24 a of the holding flange 24 is connected to the inflow portion 32 of the vortex generating unit 30 through a communication channel such as a flexible pipe. Thereby, the dust generated at the tip of the drill bit 7 flows into the vortex generating unit 30 from the inlet 32a of the inflow portion 32 via the dust suction nozzle 22, the holding hook 24, and the flexible pipe. In the eddy current generating unit 30, the dust is centrifuged and sent to the dust collecting unit 80 from the connection portion 34, and further centrifuged in the dust collecting unit 80 and collected in the dust collecting chamber.

FIG. 3 is a partial cross-sectional view showing a partial cross section of the dust collector 20 in a front view. FIG. 4 is a partial cross-sectional view showing a partial cross-section of the dust collector 20 in perspective. Hereinafter, based on FIG. 3 and FIG. 4, the structure of the dust collector 20 is demonstrated. In the dust collector 20, the dust-containing air flows in from the inlet 32 a, and the air from which the dust is removed from the dust-containing air flows out from the dust suction fan 64. Hereinafter, with respect to the air flow path in the dust collector 20, a position close to the inflow port 32 a may be referred to as “upstream side”, and a position close to the dust suction fan 64 may be referred to as “downstream side”.

<Configuration of Drive Unit 60>
The drive unit 60 includes a main body casing 61. A filter 66 and a dust suction fan 64 are accommodated in the main body casing 61. A shaft of a motor 62 is connected to the dust suction fan 64. The motor 62 is driven by the power supplied from the battery pack 5, but may be driven by the power supplied from another power supply device. The dust suction fan 64 is rotated by driving the motor 62 and draws air of the vortex generating unit 30 located on the upstream side of the drive unit 60 in the downstream direction, that is, on the main body casing 61 side. Due to the rotation of the dust suction fan 64, the inside of the eddy current generating unit 30 becomes negative pressure, so that dust generated by the drill bit 7 flows through the dust suction nozzle 22, the holding hook 24 and a flexible pipe (not shown). It flows into the vortex generating unit 30 from the inlet 32a.

In the main body casing 61, the filter 66 is provided on the upstream side of the dust suction fan 64 and collects dust flowing in from the vortex generating unit 30. The filter 66 may be a HEPA (High Efficiency Particulate Air) filter. The filter 66 is formed in an annular shape on the disk sheet. The air flowing in from the vortex generating unit 30 passes through the filter 66 and is sucked into the dust suction fan 64.

In the dust collector 20, the eddy current generating unit 30 and the dust collecting unit 80 are arranged on the upstream side of the drive unit 60. Most of the dust having a large particle diameter is sent from the eddy current generating unit 30 to the dust collecting unit 80 and collected by the dust collecting unit 80. As will be described later, in the eddy current generation unit 30, the mesh filter 40 is provided as a pre-filter, so that dust having a large particle size is also collected by the mesh filter 40. Therefore, dust having a large particle size does not flow into the main body casing 61 of the drive unit 60, and the filter 66 collects only the dust having a small particle size that has passed through the mesh filter 40. Thereby, clogging of the filter 66 can be suppressed, and the filter 66 can be used for a long time. The air that has passed through the filter 66 is discharged from the dust suction fan 64 to the outside.

<Configuration of Eddy Current Generation Unit 30>
The eddy current generating unit 30 includes a cylindrical casing 31 whose inner peripheral surface is cylindrical. The vortex generating unit 30 has a function of rotating dust-containing air flowing in from the inflow port 32a and centrifuging dust. For this purpose, the eddy current generating unit 30 includes a first turning promoting portion 36 that constitutes an inclined surface that turns spirally around the support shaft 38. The support shaft 38 and the first turning promotion portion 36 may be integrally formed of a resin material. The support shaft 38 is attached so as to hang down from the center of the circular upper plate of the cylindrical casing 31.

In the embodiment, the inclined surface of the first turning promotion portion 36 is turned about two rounds (720 degrees) spirally around the support shaft 38 from the uppermost start end portion 36a to the lowermost end portion 36b. The start end portion 36 a of the first turning promotion portion 36 is provided in the vicinity of the inlet 82 b of the return path 82, and the inclined surface continuing from the start end portion 36 a promotes the turning of the air flowing in from the return path 82. The intermediate part 36c of the first turning promotion part 36 is provided in the vicinity of the end 32b of the inlet 32a into which the dust-containing air flows. In the intermediate portion 36c of the first turning promotion portion 36, the dust-containing air flowing in from the inflow port 32a and the air flowing in from the return path 82 merge, and merge by an inclined surface from the intermediate portion 36c to the end portion 36b. Air swirl is promoted. The intermediate portion 36c serving as a confluence point may be provided so as to be a point that has made one round turn from the start end portion 36a.

In the first turning promotion portion 36 of the embodiment, the turning length from the intermediate portion 36c to the end portion 36b is about one turn (360 degrees), but the turning length from the intermediate portion 36c to the end portion 36b is It may be longer than one round (360 degrees). The vortex flow of the air in the vortex generating unit 30 is generated by the inclined surface by the first turning promotion unit 36, and the longer the inclined surface, the higher the vortex flow velocity. In order to improve the centrifugal separation efficiency of the dust in the vortex generating unit 30, it is preferable to increase the flow velocity of the swirling air. Therefore, the swirling length from the intermediate portion 36c to the end portion 36b is longer than one turn, for example, two or more turns. It is good.

A conical mesh filter 40 for collecting dust is provided below the lower end of the support shaft 38. The mesh filter 40 has a plurality of meshes (mesh) and collects dust having a relatively large particle diameter. By making the mesh filter 40 into a conical shape that gradually spreads and inclines with the vicinity of the lower end of the support shaft 38 as a vertex, it is possible to increase the ventilation area, and as a result, increase in ventilation resistance can be suppressed. . In the eddy current generating unit 30, dust having a large particle diameter swirls along the inner peripheral surface of the cylindrical casing 31 by a centrifugal separation action, and most of the dust is sent to the dust collecting unit 80 and collected. Therefore, the amount of dust collected by the mesh filter 40 is much smaller than the amount of dust collected by the dust collection unit 80.

At a position along the bottom 44 of the vortex generating unit 30, a discharge port 42 for discharging the swirling dust to the dust collecting unit 80 by centrifugal force is formed. The discharge port 42 of the vortex generating unit 30 and the opening 86 of the dust collecting unit 80 are connected by the connecting portion 34. By forming the discharge port 42 from the same height as the bottom portion 44 of the vortex generating unit 30, the dust swirling the bottom portion 44 can be efficiently sent to the dust collection unit 80.

The connecting portion 34 is preferably inclined downward from the outlet 42 of the vortex generating unit 30 toward the opening 86 of the dust collecting unit 80. Since the connecting portion 34 is inclined downward from the discharge port 42 toward the opening 86, the dust can be more efficiently sent to the dust collecting unit 80 by using gravity.

As shown in FIG. 3, the bottom 44 has a circular through hole 48 for allowing the air that has passed through the mesh filter 40 to flow into the main body casing 61. Air flowing into the main casing 61 from the through hole 48 passes through the filter 66 and is discharged from the dust suction fan 64 to the outside.

Further, an annular stepped portion 46 is erected on the bottom portion 44. The annular step portion 46 is formed so as to surround the through hole 48. The lower end portion of the mesh filter 40 is disposed at the annular upper end portion of the step portion 46. As a result, the mesh filter 40 is provided at a position higher than the bottom 44 of the eddy current generating unit 30.

In the cylindrical casing 31, a part of the dust turns around the bottom 44 before being sent out from the discharge port 42 to the dust collecting unit 80. Therefore, when the mesh filter 40 is provided on the same surface as the bottom 44, dust turning around the bottom 44 may be collected below the mesh filter 40. When the amount of collected dust increases, the ventilation area as a filter decreases, and the ventilation resistance between the cylindrical casing 31 and the main body casing 61 increases. Therefore, the mesh filter 40 of the embodiment is provided at a position higher than the bottom portion 44, and suppresses the collection of dust turning around the bottom portion 44.

Note that, due to the centrifugal separation action caused by the swirling of the dust-containing air, the dust turns along the inner peripheral surface of the cylindrical casing 31 as it comes closer to the bottom 44. Therefore, there is a high possibility that dust is present near the center of the shaft on the upper side of the lower side of the mesh filter 40. Therefore, it is preferable for the mesh filter 40 to prevent the passage of dust by making the upper mesh (mesh) smaller than the lower mesh. On the contrary, the mesh filter 40 has a lower mesh larger than the upper mesh to increase the ventilation area of the entire filter and reduce the ventilation resistance between the cylindrical casing 31 and the main body casing 61. preferable.

<Configuration of dust collection unit 80>
The dust collection unit 80 includes a cylindrical casing 81 whose inner peripheral surface is cylindrical. The cylindrical casing 81 is formed with a dust collection chamber 84 that collects and collects dust. The dust collecting unit 80 has a function of further rotating the air containing the dust flowing in from the opening 86 and centrifuging the dust. For this purpose, the dust collection unit 80 includes a second turning promoting portion 88 formed between the opening 86 and the dust collection chamber 84 so that the cross-sectional area becomes narrower downward. The second turning promoting portion 88 is formed of an inverted conical funnel member, and has an opening 89 communicating with the dust collecting chamber 84 at the lower end portion. The second swirl promoting unit 88 swirls air containing dust flowing from the opening 86 through the connection unit 34 to centrifuge the dust. The dust collection chamber 84 accumulates dust that has been centrifuged by the second turning promoting portion 88 and dropped from the opening 89. The lower opening of the cylindrical casing 81 is closed by a detachable bottom cover 90, but the operator can discard the dust collected in the dust collection chamber 84 by removing the bottom cover 90.

The upper opening of the cylindrical casing 81 is covered with an upper lid 92. At the center of the upper lid 92, a cylindrical outlet 82a that communicates with the upper and lower sides of the upper lid 92 is formed. The dust collector 20 includes a return path 82 that communicates the outlet 82 a of the dust collection unit 80 and the inlet 82 b of the vortex generator 30. For example, the return path 82 may be configured by a communication channel such as a flexible tube. The return path 82 is provided to return the air flowing into the dust collection unit 80 to the vortex generating unit 30.

FIG. 5 shows an AA cross-sectional view of the dust collector 20 shown in FIG. This AA sectional view shows the vicinity of the bottom 44 in the eddy current generating unit 30, and the dust swirling around the bottom 44 is discharged from the discharge port 42 by centrifugal force and collected from the opening 86 via the connection 34. It flows into the unit 80. The connecting portion 34 discharges air containing dust from the opening 86 to the second turning promotion portion 88 provided below the opening 86, and the air containing dust thereby travels along the slope of the second turning promotion portion 88. Turn. In order to efficiently centrifuge the dust, the connecting portion 34 preferably discharges the air containing the dust along the slope of the second turning promotion portion 88.

FIG. 6 is a view for explaining the movement of dust in the AA cross section of the dust collector 20 shown in FIG. The dust centrifuged in the eddy current generating unit 30 flows into the dust collecting unit 80 from the connection portion 34. The air containing the dust that has flowed into the dust collecting unit 80 is swirled by the second swirl promoting unit 88, and the centrifuged dust is collected in the dust collecting chamber 84 through the opening 89.

3 and 4, the air from which the dust has been removed passes through the return path 82 from the outlet 82a, and returns to the vortex generating unit 30 from the inlet 82b. Since air containing dust is discharged from the connecting portion 34 to the dust collecting unit 80 and the vortex generating unit 30 is maintained at a negative pressure, the air flowing into the dust collecting unit 80 flows backward from the connecting portion 34. Without being returned to the vortex generating unit 30 from the return path 82.

Thus, according to the dust collecting apparatus 20 of the embodiment, the dust can be efficiently collected in the dust collecting chamber 84 by centrifuging the dust by the first turning promotion unit 36 and the second turning promotion unit 88. Further, the air from which the dust has been removed is returned to the vortex generating unit 30 by the return path 82, so that the air containing the dust is prevented from flowing back through the connecting portion 34, and the dust is more efficiently introduced into the dust collecting chamber 84. Can be collected.

FIG. 7 shows an example of the inlet 82 d of the return path 82 formed in the vortex generating unit 30. The inflow port 82b shown in FIG. 3 allows air to flow in a direction substantially perpendicular to the inclined surface of the first turning promotion portion 36, but the inflow port 82d shown in FIG. Allow air to flow along the surface. As a result, the return path 82 can cause the air of the dust collection unit 80 to flow in a direction that promotes the swirling of the dust-containing air in the vortex generating unit 30. That is, the air flowing in from the inflow port 82d swirls along the inclined surface continuing from the start end 36a without reducing the flow velocity. Therefore, in the intermediate part 36c, when the dust-containing air flowing in from the inlet 32a and the air flowing in from the return path 82 merge, the dust-containing air is accelerated by the air from the return path 82, and swirling is promoted. . Thus, by accelerating the dust-containing air using the air from the return path 82, the swirl speed of the dust-containing air in the vortex generating unit 30 can be increased, and the centrifugal action can be improved.

FIG. 8 shows another example of the AA cross-sectional view of the dust collector 20 shown in FIG. In this example, the cross-sectional area of the opening 86 a of the dust collection unit 80 is smaller than the cross-sectional area of the discharge port 42 of the vortex generating unit 30. The connection portion 34 is preferably formed so as to gradually reduce the cross-sectional area from the discharge port 42 to the opening 86a. Thus, by forming the cross-sectional area of the opening 86a smaller than the cross-sectional area of the discharge port 42, it is possible to increase the flow velocity of the air flowing into the dust collection unit 80 from the opening 86a. When the flow velocity of the air containing the dust increases, the centrifugal separation efficiency in the second turning promotion unit 88 is improved, so that the dust can be suitably collected in the dust collection chamber 84.

FIG. 9 is a diagram for explaining the flow of air in the dust collector 20. In FIG. 9, an arrow indicated by a solid line indicates the flow direction of air containing dust, and an arrow indicated by a dotted line indicates the flow direction of air from which dust has been removed. The dust-containing air that has flowed into the vortex generating unit 30 is swirled by the first swirl promoting unit 36, and the centrifuged dust is discharged from the connecting unit 34 to the dust collecting unit 80. In the dust collection unit 80, the air containing the dust is swirled by the second swirl promoting unit 88, and the centrifuged dust is stored in the dust collecting chamber 84.

In the dust collecting unit 80, the air from which the dust has been removed is returned to the vortex generating unit 30 from the return path 82, joined with the dust-containing air, and swirled by the first swirl promoting unit 36. The centrifugal action and the mesh filter 40 remove dust from the air in the vicinity of the axis of the cylindrical casing 31, and the air from which the dust has been removed passes through the mesh filter 40 and the filter 66 and passes from the dust suction fan 64 to the outside. To be discharged. According to the dust collecting apparatus 20 of the embodiment, it is possible to increase the dust collection efficiency by centrifugal separation by providing the first turning promotion part 36 and the second turning promotion part 88. Moreover, by providing the return path 82 in the dust collector 20, it is possible to further increase the dust collection efficiency by centrifugal separation.

The outline of one embodiment of the present invention is as follows.
The dust collector (20) according to an aspect of the present invention includes a vortex generating unit (30) for rotating dust-containing air flowing in from an inlet (32a) and centrifuging the dust, and a vortex generating unit (30) for centrifugal separation. A dust collection unit (80) that collects the separated dust, a discharge port (42) of the eddy current generation unit (30), and a connection portion (34) that connects the openings (86, 86a) of the dust collection unit (80). And comprising. The dust collection unit (80) has a swirl promoting part (88) for swirling air containing dust flowing in from the openings (86, 86a) of the dust collecting unit (80) through the connection part (34), and a swirl promotion A dust collection chamber (84) for storing the dust centrifuged at the section (88).

The dust collector (20) may further include a return path (82) for returning the air that has flowed into the dust collection unit (80) to the vortex generator unit (30).

The return path (82) may cause the air of the dust collection unit (80) to flow in a direction that promotes the swirling of the dust-containing air in the eddy current generation unit (30).

Rotation promoting part (88) is preferably formed between openings (86, 86a) and dust collection chamber (84).

The connecting portion (34) is preferably inclined downward from the discharge port (42) of the vortex generating unit (30) toward the openings (86, 86a) of the dust collecting unit (80).

The cross-sectional area of the opening (86a) of the dust collecting unit (80) may be formed smaller than the cross-sectional area of the discharge port (42) of the vortex generating unit (30).

The eddy current generating unit (30) further includes a conical mesh filter (40) for collecting dust, and the discharge port (42) is positioned along the bottom (44) of the eddy current generating unit (30). The mesh filter (40) is preferably provided at a position higher than the bottom (44) of the eddy current generating unit (30).

The mesh filter (40) may be formed so that the mesh is larger on the lower side than on the upper side.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to each of those constituent elements or combinations of processing processes, and such modifications are also within the scope of the present invention. .

DESCRIPTION OF SYMBOLS 20 ... Dust collector, 22 ... Dust suction nozzle, 22a ... Suction nozzle, 22b ... Connection nozzle, 22c ... Surrounding member, 24 ... Holding collar, 24a ... End part, 30 ... Eddy current generating unit, 31 ... Cylindrical casing, 32 ... Inflow part, 32a ... Inlet, 34 ... Connection part, 36 ... First turning promotion part, 38 ... support shaft, 40 ... mesh filter, 42 ... discharge port, 44 ... bottom, 46 ... step, 48 ... through hole, 60 ... drive unit, 61 ... Main body casing, 62 ... Motor, 64 ... Dust suction fan, 66 ... Filter, 80 ... Dust collection unit, 81 ... Cylindrical casing, 82 ... Return path, 82a .. Outlet, 82b, 82d ... Inlet, 84 ... Dust collection chamber, 86, 86a ... Opening, 88 ... second turning promoting portion, 89 ... opening, 90 ... bottom cover, 92 ... upper cover.

The present invention can be used for a power tool such as a drill driver.

Claims

An eddy current generating unit that swirls dust-containing air flowing in from the inlet and centrifuges the dust;
A dust collecting unit for collecting the dust separated by the eddy current generating unit;
A dust collector comprising: a discharge port of the eddy current generating unit; and a connecting portion for connecting an opening of the dust collecting unit,
The dust collection unit is
A turning facilitator for swirling air containing dust flowing from the opening of the dust collecting unit through the connecting part;
A dust collection chamber for storing dust centrifuged at the rotation promoting portion;
A dust collector characterized by comprising:
The dust collecting apparatus according to claim 1, further comprising a return path for returning the air that has flowed into the dust collecting unit to the vortex generating unit.
The dust collecting device according to claim 2, wherein the return path causes the air of the dust collecting unit to flow in a direction that promotes the swirling of the dust-containing air in the vortex generating unit.
The dust collector according to any one of claims 1 to 3, wherein the swirl promoting portion is formed between the opening and the dust collection chamber.
5. The dust collection device according to claim 1, wherein the connection portion is inclined downward from an outlet of the eddy current generation unit toward an opening of the dust collection unit. apparatus.
6. The dust collector according to claim 1, wherein a cross-sectional area of the opening of the dust collecting unit is formed smaller than a cross-sectional area of the discharge port of the vortex generating unit. .
The eddy current generating unit further includes a conical mesh filter for collecting dust,
The discharge port is formed at a position along the bottom of the vortex generating unit,
The mesh filter is provided at a position higher than the bottom of the eddy current generating unit.
The dust collector according to any one of claims 1 to 6, wherein
The dust collector according to claim 7, wherein the mesh filter has a mesh larger on the lower side than on the upper side.