JP2013049115A - Filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the maintenance of sweeping dust attached to or accumulated in a machine tool body by performing a sufficient operation for filtering ambient air to be sucked into the machine tool.SOLUTION: A filtering device 40 filters out dust or the like caused by ambient air sucked into the machine tool body by a driving motor included in the mounted machine tool body. Here, a circumferential surface (circumferential surface 431 of a cylindrical air sucking section 43) of a housing 41 of the filtering device is provided with an air sucking section 45 of the filtering device 40 to act as a section for sucking ambient air into a centrifugal separation chamber 55. The air sucking section 45 is formed in such a manner that, when the suction air to be sucked into the machine tool body stops to cause the centrifugal separation function of the centrifugal separation chamber 55 to be de-actuated, separated substances D (dust or the like) separated inside the centrifugal separation chamber 55 is discharged through the air sucking section 45 to the outside by the own weight of the separated substance D.

Description

  The present invention relates to a filter device that is configured to be attachable to a tool body, and filters dust and the like from outside air sucked into the tool body by a power source provided in the attached tool body.

  For example, a power tool such as a disk glider incorporates a drive motor as a power source. This drive motor is an electric motor that rotates the spindle by supplying electric power. The drive motor uses a rotational driving force of the spindle to rotate a member such as a grindstone to function as an electric tool. At this time, the built-in drive motor generally generates heat due to the generation of the rotational driving force. For this reason, in such an electric tool, a cooling fan for cooling the drive motor is provided to remove heat from the drive motor. This cooling fan is attached to the spindle of the drive motor described above so as to be integrally rotatable. The cooling fan mounted in this manner rotates with the rotation of the spindle, sucks air outside the power tool (outside air) into the power tool, and blows it toward the drive motor as motor cooling air. Yes.

By the way, an electric component such as a drive motor is built in the electric tool described above. For this reason, if dust is mixed with the motor cooling air described above, these electric components are defective. Therefore, in the outside air sucked as the motor cooling air as described above, it is necessary to filter it so as to remove dust mixed in the outside air.
Therefore, various structures are provided in the intake portion of such a power tool in order to remove dust mixed in the sucked outside air. For example, a complicated air passage (labyrinth structure) is provided in an intake portion sucked into the electric tool from the outside of the electric tool (see Patent Document 1), or a dust filter is provided in the intake portion sucked into the electric tool. A technique of arranging (see Patent Document 2 and Patent Document 3) is known. According to such a technique, when the outside air used as the motor cooling air flowing toward the drive motor is sucked into the electric tool, dust mixed with the outside air can be removed, and the clean air can be used as the motor cooling air. It can be sprayed toward the drive motor.

JP 2008-302467 A Japanese Utility Model Publication 2-85555 Japanese Patent Application Laid-Open No. 2002-283255

  However, it has been pointed out that the technique for arranging the labyrinth structure described above is insufficient in filtering the outside air sucked into the power tool. Further, in the technique of disposing the dust removal filter described above, when an electric tool is used for a long time, dust adheres to the dust removal filter and accumulates. If it does so, the air permeability of a dust removal filter will be inhibited, the pressure loss at the time of external air suction will become large, and the air volume as motor cooling air will be reduced. For this reason, in the technique which arrange | positions the above-mentioned dust removal filter, it is necessary to clean a dust removal filter regularly, and it became a troublesome thing from a maintenance viewpoint.

  The present invention has been made in view of such circumstances, and the problem to be solved by the present invention is configured to be attachable to a tool body such as an electric tool, for example. It is a filter device that filters out dust and the like of the outside air sucked into the tool body by a power source provided in the mounted tool body, and further, on this, the outside air sucked into the tool body The purpose is to eliminate maintenance (free of maintenance) such as cleaning of adhering and accumulated dust while ensuring sufficient filtration.

In order to solve the above problems, the filter device according to the present invention takes the following means.
That is, the filter device according to the first aspect of the present invention is configured to be attachable to the tool body, and removes dust from outside air sucked into the tool body by a power source provided in the attached tool body. A filter device that performs filtration such as a device housing provided with a centrifuge chamber that exhibits a centrifugal separation function by suction air sucked into the tool body, and provided on a peripheral surface of the device housing, A suction portion for sucking outside air toward the centrifugal separation chamber, and the centrifugal separation function of the centrifugal separation chamber is stopped depending on the stop of the suction air sucked into the tool body. In this case, the separated product separated in the centrifuge chamber is formed so as to be discharged to the outside.

  According to the filter device according to the first aspect of the present invention, since the centrifuge chamber that exhibits the centrifuge function is provided by the suction air sucked into the tool body, dust or the like (hereinafter including dust and water droplets) Therefore, it is possible to provide a filtering effect that separates the outside air mixed with dust into clean air, and to supply clean air to the inside of the tool body. At this time, dust or the like mixed in the outside air is merely separated from clean air by the centrifugal separation function, so that dust does not adhere to or accumulate on the intake portion. In addition, the suction part can discharge the separated material in the centrifuge chamber to the outside when the centrifuge function of the centrifuge chamber stops depending on the stop of the suction air sucked into the tool body. Thus, the separated outside air (corresponding to the above-mentioned “dust etc.”) can be discharged to the outside by stopping the suction air without accumulating in the centrifuge chamber. As a result, the outside air sucked into the tool body can be sufficiently filtered, and maintenance is not required (maintenance-free) without cleaning the deposited dust and the like, and the convenience as a tool is improved. be able to. According to the filter device of the first aspect of the present invention, the separated air can be discharged to the outside without being collected in the centrifuge chamber by the centrifugal separation function. The storage box to be used can be made unnecessary, and the overall size of the tool when mounted can be reduced.

The filter device according to a second aspect of the present invention is the filter device according to the first aspect of the present invention, wherein the suction portion is centrifuged in the centrifugal separation chamber depending on the stop of suction air sucked into the tool body. When the function is stopped, the separated product separated in the centrifuge chamber is automatically discharged to the outside through the intake portion by its own weight.
According to the filter device of the second aspect of the present invention, when the centrifugal separation function of the centrifugal separation chamber is stopped depending on the stop of the suction air sucked into the inside of the tool body, the air intake portion is disposed in the centrifugal separation chamber. Since the separated material is automatically discharged to the outside through the suction part due to the weight of the separated material, the separation of the outside air separated by the centrifugal separation function can be performed simply by stopping the power source of the tool body. Objects (corresponding to “dust etc.” described above) can be automatically discharged outside without accumulating in the centrifuge chamber. As a result, for example, a simple operation for discharging the separated object, such as shaking the tool, can be made unnecessary, and the tool is easy to use.

According to a third aspect of the present invention, there is provided a filter device according to the first or second aspect of the present invention, wherein the air flow guide guides the outside air sucked from the intake section so as to generate an air flow in the centrifugal separation chamber. The portion is provided inside the device housing.
According to the filter device according to the third aspect of the invention, the airflow guide portion that guides the outside air sucked from the intake portion so as to generate an airflow in the centrifugal separation chamber is provided inside the device housing. The degree of freedom in selecting the shape of the outer portion of the device housing can be increased. Thereby, the shape of the outer part of the apparatus housing can be selected to a shape corresponding to the tool body, and the convenience when the tool housing is attached to the tool body can be enhanced.

A filter device according to a fourth aspect of the present invention is the filter device according to any one of the first to third aspects of the invention, wherein a plurality of the intake portions are disposed at intervals with respect to the peripheral surface of the device housing. It is characterized by.
According to the filter device of the fourth aspect of the present invention, since a plurality of intake portions are disposed with a space from the peripheral surface of the device housing, an intake region for sucking outside air can be secured. Therefore, it is possible to secure a sufficient air volume of the supply air filtered. Furthermore, when the separated outside air separated matter (dust or the like) is discharged from the intake portion to the outside, the discharge region can be secured in a plurality of directions. Thereby, while the air volume of the filtered supply air can be sufficiently secured, the separated matter can be discharged from the intake portion to the outside regardless of the posture of the tool.

A filter device according to a fifth aspect of the present invention is the filter device according to any one of the first to fourth aspects of the present invention, wherein the position of the intake portion disposed on the peripheral surface of the device housing is the filter device. It is set to the position which faces a gravity direction with respect to the surrounding surface of the said apparatus housing in the regular fixed attitude | position of the tool main body with which the apparatus was mounted | worn.
According to the filter device according to the fifth aspect of the present invention, the arrangement position of the air intake section is set to a position facing the circumferential direction of the device housing in the regular stationary posture of the tool body on which the filter device is mounted. Therefore, when the separated matter (dust etc.) of the outside air separated in the regular fixed posture of the tool main body is discharged from the intake portion to the outside, it is easy to let it be discharged from the intake portion to the outside by its own weight. it can. Thereby, the function of discharging the separated material in the regular stationary posture can be further enhanced.

A filter device according to a sixth aspect of the present invention is the filter device according to any one of the first to fifth aspects, wherein the outer portion functions as a grip of the mounted tool body.
According to the filter device of the sixth aspect of the invention, the outer portion functions as a grip for the mounted tool body, so that the tool body grip can be formed simply by mounting the filter device to the tool body. As a result, the function as the filter device described above and the function of the grip of the tool body can be combined, and the entire tool can be made compact.

A filter device according to a seventh invention is the filter device according to any one of the first to sixth inventions, wherein the tool body is configured as a body of a hand-held electric tool, and the power source is an electric motor The suction air is a wind generated by a motor cooling fan that is attached to the rotation shaft of the drive motor and is sucked together with the rotation of the rotation shaft.
According to the filter device of the seventh aspect of the invention, the tool body is configured as a body of a hand-held power tool, the power source is configured of an electric drive motor, and the suction air is attached to the rotation shaft of the drive motor. Since the wind is generated by the motor cooling fan that is sucked together with the rotation of the rotating shaft, the wind filtered by the filter device described above can be used as motor cooling air for cooling the drive motor.

A power tool according to an eighth aspect of the present invention is a power tool configured to include a power source, and the first to the above-described first to the suction upstream side of the outside air sucked into the tool body by the power source. 7. A filter device according to any one of the inventions 7 is mounted.
According to the power tool of the eighth invention, since the filter device according to any one of the first to seventh inventions is mounted, the power tool that can enjoy the above-described effects can be obtained. . In other words, while maintaining sufficient filtration of the outside air sucked into the tool body, maintenance as a filter device is made unnecessary (maintenance-free) without cleaning the deposited dust (dust, water droplets, etc.). be able to.

According to the filter device according to the first aspect of the present invention, the maintenance of the outside air sucked into the tool body is not required without sufficient cleaning of the deposited dust (dust, water droplets, etc.) while maintaining sufficient filtration. (Maintenance-free) and the convenience as a tool can be improved.
According to the filter device according to the second aspect of the invention, for example, a simple operation for discharging separated matter (dust etc.) such as shaking a tool can be made unnecessary, and it becomes easy to use as a tool. .
According to the filter device concerning the 3rd invention, the shape of the outside part of a device housing can be chosen in the shape according to a tool main part, and the convenience at the time of mounting on a tool main part can be improved.
According to the filter device according to the fourth aspect of the present invention, it is possible to discharge the separated matter from the intake portion to the outside regardless of the posture of the tool while ensuring a sufficient air volume of the filtered supply air. it can.
According to the filter device concerning the 5th invention, the function which discharges the separation thing in a regular stationary posture can be raised more.
According to the filter device of the sixth invention, the function as the filter device described above and the function of the grip of the tool body can be used together, and the entire tool can be made compact.
With the filter device according to the seventh aspect of the invention, the wind filtered by the filter device can be used as motor cooling air for cooling the drive motor.
According to the power tool according to the eighth aspect of the present invention, it is possible to eliminate the need for maintenance (maintenance-free) as the filter device while sufficiently filtering the outside air as the filter device.

It is an external appearance perspective view which shows the external appearance of the electric tool which comprises the filter apparatus used as 1st Embodiment by a perspective view. It is an external appearance top view which shows the external appearance of the electric tool of FIG. It is sectional drawing which shows the III-III cross-section arrow in FIG. 1 and FIG. It is an external appearance perspective view which shows the external appearance of the filter apparatus used as 1st Embodiment by a perspective view. It is an external appearance side view which shows the external appearance of the filter apparatus of FIG. 4 by a side view. It is an external appearance rear view which shows the external appearance of the filter apparatus of FIG. It is sectional drawing which shows the VII-VII sectional arrow of the filter apparatus in FIG. It is sectional drawing which shows the VIII-VIII cross-section arrow of the filter apparatus in FIG. It is sectional drawing which shows the IX-IX cross section arrow of the filter apparatus in FIG. It is an effect | action schematic diagram which shows the external air attracted | sucked inside the filter apparatus typically. It is an action schematic diagram which shows typically centrifugal separation inside a filter device. It is an effect | action schematic diagram which shows typically discharge | emission of the separated material inside a filter apparatus. It is an effect | action schematic diagram which schematizes and shows the external air attracted | sucked inside the filter apparatus of the electric tool used as 2nd Embodiment. It is an effect | action schematic diagram which shows typically the centrifugation inside the filter apparatus of FIG. It is an effect | action schematic diagram which shows typically discharge | emission of the separated material inside the filter apparatus of FIG.

[First Embodiment]
Hereinafter, a first embodiment for carrying out a filter device according to the present invention will be described with reference to FIGS. In the following description, the filter device according to the present invention will be described by taking as an example a tool with the filter device mounted thereon, that is, a disc grinder as an electric tool.
FIG. 1 is an external perspective view showing the external appearance of the disc grinder 10 including the filter device 40 according to the first embodiment in perspective. FIG. 2 is an external top view showing the external appearance of the disc grinder 10 in top view. FIG. 3 is a cross-sectional view of the disc grinder 10 shown in FIGS. 1 and 2 taken along the line III-III. The disk grinder 10 described below defines the top, bottom, front, back, left and right of the disk grinder 10 as shown in the drawing for easy understanding. The upper and lower regulations of the disc grinder 10 are based on the regular stationary posture of the disc grinder 10. That is, the lower side of the disc grinder 10 is the side facing the direction of gravity.
As shown in FIG. 3, the disc grinder 10 includes an output spindle 37 that is driven to rotate, and is a tool that grinds an object to be ground with a grindstone B attached to the output spindle 37, and can be held and handled by hand. It is a hand-held power tool that can be used. The disc grinder 10 is configured to include a drive motor 23 serving as a power source. The drive motor 23 is configured by an electric brush motor that is rotationally driven by electric power. The disc grinder 10 is used with power supplied from the outside. That is, the disc grinder 10 is configured to include a power cord for connecting to an external household AC power source, and is driven by the power supplied from the household AC power source. . In the illustrated disc grinder 10, illustration of such a power cord is omitted in order to make the configuration of the filter device 40 easy to understand.

As shown in FIG. 3, the disc grinder 10 includes a tool body 15 having a built-in drive motor 23, and a filter device that separates sucked outside air into dust and the like (dust and water droplets) and motor cooling air by a centrifugal separation function. 40. The motor cooling air passes through while contacting a heat generating member such as the drive motor 23 as shown by a thick chain line in FIG. At this time, the motor cooling air cools the heat generating members such as the drive motor 23.
As shown in FIG. 3, the tool body 15 includes a power generation unit 20 and a power conversion unit 30.
As shown in FIG. 3, the power generation unit 20 is configured to be housed in a motor housing 22 serving as a main body housing. The power generation unit 20 includes a drive motor 23 for rotating the output spindle 37. This drive motor 23 is comprised by the brush motor which comprises the motor spindle 25 as a rotational drive shaft.
In addition, since the drive motor 23 is comprised by the brush motor used widely, detailed description regarding this drive motor 23 is abbreviate | omitted. That is, the drive motor 23 includes a field as a stator, an armature as a rotor, a commutator as a commutator, and a carbon brush, as in a general brush motor, and a motor together with the rotor (armature, commutator). The spindle 25 is rotated integrally. The motor spindle 25 is rotatably supported by bearings 24 arranged at the front and rear ends. The motor spindle 25 corresponds to a rotating shaft according to the present invention that is rotated by the drive motor 23. The motor spindle 25 functions as an output shaft that outputs a rotational driving force from the power generation unit 20 toward the power conversion unit 30. In other words, the motor spindle 25 functions as an input shaft for inputting the rotational driving force from the power generation unit 20 to the power conversion unit 30.

As shown in FIG. 3, the power conversion unit 30 is configured to be housed in a gear housing 32 serving as a main body housing. The power conversion unit 30 converts the rotation direction and the rotation speed related to the rotational driving force input from the motor spindle 25 in order to rotate the output spindle 37. That is, the power conversion unit 30 is configured by meshing the driving side gear 33 and the driven side gear 35. The driving side gear 33 and the driven side gear 35 are constituted by bevel gears (bevel gears). Further, the number of teeth of the driven gear 35 is larger than the number of teeth of the drive side gear 33. The output spindle 37 is attached so as to be rotatable together with the driven gear 35.
Thus, the rotational drive of the output spindle 37 is rotated so that the rotational direction is converted to a direction relatively orthogonal to the rotational direction and the rotational speed is relatively reduced as compared with the rotational drive of the motor spindle 25. Speed has been converted. The rotational torque of the output spindle 37 is higher than that of the motor spindle 25. The output spindle 37 is supported by bearings 38 disposed at the upper and lower end positions of the output spindle 37. Further, a cover body 18 for preventing scattering of grinding powder by the grindstone B is attached to the rear half circumference range of the grindstone B.
The gear housing 32 that houses the power conversion unit 30 configured as described above is provided with an exhaust port 39. The exhaust port 39 is a vent for exhausting motor cooling air sent by a motor cooling fan 27 described below to the outside. For this reason, the exhaust port 39 is formed to be open so as to communicate with the inside and outside of the tool body 15.

A motor cooling fan 27 is attached to the front end portion of the motor spindle 25 described above. The motor cooling fan 27 is attached so as to rotate integrally with the motor spindle 25. Therefore, the motor cooling fan 27 is a so-called centrifugal blower fan that rotates integrally with the motor spindle 25. The rotated motor cooling fan 27 sucks air from the rear side of the tool body 15 in the direction along the rotation axis direction of the motor cooling fan 27 and exhausts air in the direction along the centrifugal direction of the motor cooling fan 27. Act to send. The wind sent in the direction along the centrifugal direction is exhausted to the outside through the exhaust port 39 provided in the gear housing 32 described above. Moreover, the wind sent from the rear side of the tool main body 15 in the direction along the rotational axis is outside air that is sucked in from an intake portion 45 provided in the filter device 40 described later. That is, outside air sucked from an intake portion 45 provided in the filter device 40 described later is sent from the inner rear side of the tool body 15 toward the inner front side while contacting each member constituting the drive motor 23. . In this way, the motor cooling fan 27 can send air that becomes motor cooling air that cools each member constituting the drive motor 23 from the rear side to the front side of the tool body 15.
The rear side of the tool body 15 is set as the outside air suction side of the motor housing 22. That is, the rear side of the motor housing 22 which is also the rear side of the tool body 15 is provided with the filter device 40 including the air intake portion 45 for sucking outside air. Here, a connecting portion 29 for connecting a filter device 40 described in detail below is provided at the rear end portion of the power generating portion 20. When the filter device 40 is connected to the connecting portion 29, the inside of the power generating portion 20 and the filter device 40 is in a communication state in which an air flow path is secured so that air can flow into each other.

Next, the filter device 40 connected to the rear end portion of the power generation unit 20 will be described. The filter device 40 is configured to be attachable to the tool body 15 described above. The filter device 40 performs filtration such as dust removal on the outside air sucked into the tool body 15 by the drive motor 23 provided in the mounted tool body 15.
FIG. 4 is an external perspective view showing the external appearance of the filter device 40 in perspective. FIG. 5 is an external side view showing the external appearance of the filter device 40 in a side view. FIG. 6 is an external rear view showing the external appearance of the filter device 40 in the rear view. 7 is a cross-sectional view showing the VII-VII cross-sectional arrow of the filter device 40 in FIG. FIG. 8 is a cross-sectional view of the filter device 40 in FIG. FIG. 9 is a cross-sectional view of the filter device 40 in FIG. That is, the filter device 40 is configured to include the intake portion 45. The intake portion 45 is provided on the peripheral surface of the device housing 41 (the peripheral surface 431 of the cylindrical intake portion 43), and is a portion where outside air is sucked into the centrifuge chamber 55. At this time, the outside air is sucked into the centrifugal separation chamber 55 by the suction air generated by the rotation of the motor cooling fan 27.
The filter device 40 is configured to include a centrifuge chamber 55 that rotates an air flow and exhibits a centrifuge function, similarly to a widely used centrifugal cyclone structure. The centrifuge chamber 55 is formed in a double cylindrical structure including an outer device housing 41 and an airflow guide tube portion 51 disposed inside the device housing 41. The centrifuge chamber 55 of the filter device 40 exhibits a centrifuge function by suction air sucked into the tool body 15. In addition, this filter apparatus 40 is comprised so that removal from the motor housing 22 used as a main body housing is possible. The outer portion of the filter device 40 attached to the tool body 15 is formed so as to function as a grip of the disc grinder 10. That is, the filter device 40 has a size and a shape that can be grasped by the user.

The device housing 41 is formed in a substantially bottomed cylindrical shape such as a cup shape in which only the front side is opened. That is, the device housing 41 is formed by dividing the function into a conical bottom portion 42 and a cylindrical intake portion 43 in order from the rear side which is the bottom. The conical bottom portion 42 and the cylindrical intake portion 43 are formed by integral molding continuous with each other.
The conical bottom portion 42 is a portion that forms the last portion of the filter device 40, and is a portion that is formed as the above-described centrifuge chamber 55. As shown in FIG. 5 and the like, the conical bottom 42 is formed in a substantially conical shape with a flat apex. Specifically, the conical bottom portion 42 includes a bottom portion 421 that is located at the rearmost portion and has a flat apex, and a conical portion 422 that increases the inner peripheral diameter from the bottom portion 421 toward the front side. That is, a range defined by the bottom portion, 421, the conical portion 422, and the rear end opening 531 of the airflow guide tube portion 51 described below is formed as the centrifuge chamber 55 according to the present invention. Yes. That is, the centrifuge chamber 55 is provided in the apparatus housing 41 and exhibits a centrifuge function that separates the outside air sucked from the air intake portion 45 into the motor cooling air and dust (such as dust and water droplets) described above. It corresponds to the space. The cylindrical intake portion 43 is formed in a shape that is continuous with the foremost end of the conical bottom portion 42. The cylindrical intake portion 43 has an inner peripheral diameter that is substantially the same as the opening diameter of the foremost end of the conical bottom portion 42 and is formed in a substantially cylindrical shape. Moreover, the bottom part, 421, and conical part 422 which divide this centrifuge chamber 55 are equivalent to the division wall which divides the centrifuge chamber based on this invention. Here, the inner wall surface 425 of the bottom part 421 and the conical part 422 facing the centrifugal separation chamber 55 intersects the horizontal direction (vertical direction, horizontal inclination when the disc grinder 10 is in a regular stationary posture). Direction). Note that the inner wall surface 425 of the conical portion 422 extends in a direction inclined with respect to the horizontal direction when the disc grinder 10 is in a regular stationary posture, and the inner wall surface 425 of the conical portion 422 is the present invention. This corresponds to the shape of the discharge guide. That is, as shown in FIG. 7, the inner wall surface 425 of the conical portion 422 is formed so as to be inclined downward from the rear side toward the front side.

An intake portion 45 is provided on the peripheral surface 431 of the cylindrical intake portion 43. The suction portion 45 is separated from the separated material (dust dust) in the centrifuge chamber 55 when the centrifuge function of the centrifuge chamber 55 is stopped depending on the stop of the suction air sucked into the tool body 15. Etc.) is automatically discharged to the outside through the intake portion 45 by the dead weight of the separated matter.
That is, the intake portion 45 is provided on the peripheral surface 431 of the cylindrical intake portion 43 in order to suck outside air toward the inside of the centrifugal separation chamber 55 by the suction air generated by the rotation of the motor cooling fan 27 described above. A plurality of the intake portions 45 are arranged at equal intervals with respect to the peripheral surface 431 of the cylindrical intake portion 43. Specifically, the four intake portions 45 are provided at equal intervals with respect to the peripheral surface 431 of the cylindrical intake portion 43 so as to be positioned in the illustrated vertical and horizontal directions of the disc grinder 10. In other words, one of the four intake portions 45 is provided on the lower side of the disc grinder 10 at a position facing the gravitational direction in the regular stationary posture of the disc grinder 10 with the filter device 40 mounted on the tool body 15. It is disposed with respect to the peripheral surface 431 of the cylindrical intake portion 43 at the facing position.
The intake portion 45 includes a housing opening 46 and an intake guide portion 47. That is, a housing opening 46 that communicates the inside and the outside of the device housing 41 is provided on the peripheral surface 431 of the cylindrical intake portion 43 that forms the device housing 41. The housing opening 46 is formed so as to allow the inside and outside of the peripheral surface 431 of the cylindrical intake portion 43 to communicate with each other in order to suck outside air into the centrifuge chamber 55 described above. The opening shape of the housing opening 46 is formed in a substantially rectangular shape extending in a direction along the rotation axis direction of the motor cooling fan 27.

  The intake guide 47 is provided outside the housing opening 46. The intake guide part 47 guides the outside air sucked into the centrifugal separation chamber 55 through the intake part 45. That is, the intake guide unit 47 guides the sucked outside air so that the outside air sucked into the centrifugal separation chamber 55 through the intake portion 45 becomes a rotating air flow that exhibits a centrifugal separation function in the centrifugal separation chamber 55. To do. The intake guide portion 47 is provided outside the peripheral surface 431 of the cylindrical intake portion 43 described above. Specifically, the intake guide portion 47 enters the inside of the device housing 41 where the outside air sucked by the rotation of the motor cooling fan 27 enters from the tangential direction of the peripheral surface 431 of the cylindrical intake portion 43. Designed. The intake guide portion 47 is formed by providing an intake port 48 on the peripheral surface 431 of the cylindrical intake portion 43 so as to open a tangential direction of the peripheral surface 431. That is, the intake guide portion 47 includes a tangential guide wall 471 that extends in the tangential direction of the peripheral surface 431 of the cylindrical intake portion 43, and a guide support wall 472 that supports the tangential guide wall 471. Here, an air inlet 48 that is opened by the tangential guide wall 471, and the guide support wall 472 is formed so that the opening direction faces the tangential direction of the peripheral surface 431. The air inlet 48 formed in this way is formed in a slit shape extending along the rotational axis direction of the motor spindle 25.

Inside the device housing 41 formed as described above, a substantially cylindrical airflow guide tube portion 51 having an opening on the front side and the rear side is disposed. The airflow guide tube portion 51 is integrated by adhesively bonding the overlapping portion 52 to the device housing 41. The airflow guide tube 51 is supported with respect to the device housing 41 by the overlapping portion 52 bonded to the device housing 41 in this way. The front end portion of the airflow guide tube portion 51 constitutes a connection portion 50 that is connected to the connection portion 29 of the tool body 15 described above.
The airflow guide cylinder portion 51 corresponds to an airflow guide portion according to the present invention. The air flow guide cylinder portion 51 has a function of guiding the outside air sucked from the intake portion 45 to generate an air flow in the centrifugal separation chamber 55. The airflow guide tube portion 51 is formed by dividing the function into a guide tube portion 53 and a connection tube portion 54 in order from the rear side. The guide cylindrical portion 53 and the connecting cylindrical portion 54 are integrally formed so as to be continuous with each other. The guide cylindrical portion 53 is formed in a cylindrical shape that reduces the inner peripheral diameter toward the rear side. A rear end opening 531 having a cylindrical shape is formed at the rearmost end of the guide cylindrical portion 53. For this reason, the cross-sectional diameter is such that the outside air sucked from the intake portion 45 can be sent to the centrifuge chamber 55 between the guide cylindrical portion 53 and the cylindrical intake portion 43 (device housing 41). An appropriate space is formed in the direction. On the other hand, the connection cylinder part 54 is formed in the cylinder shape protruded to the front side from the apparatus housing 41, and the front-end opening part 541 is formed. The front end opening 541 is connected to the rear side of the motor housing 22 which is also the rear side of the tool body 15.

According to the filter device 40 described above, the function of separating the separated material and the function of discharging the separated material can be exhibited as follows. 10 to 12 are action schematic diagrams schematically showing the action of centrifuging dust and the like (dust and water droplets) mixed in the outside air and the action of discharging the separated material separated by this centrifugation. It is. That is, FIG. 10 is a schematic operation diagram schematically showing the outside air sucked into the filter device 40. FIG. 11 is an operation schematic diagram schematically showing the centrifugal separation in the filter device 40. FIG. 12 is an operation schematic diagram schematically showing the discharge of the separated matter inside the filter device 40. 10 is a schematic view of the operation in the rear view when viewed along the rotational axis direction of the motor spindle 25. FIGS. 11 and 12 are viewed along the direction intersecting the rotational axis of the motor spindle 25. FIG. It is an operation schematic diagram in the case of a side view.
That is, as described above with reference to FIG. 3, the motor cooling fan 27 that rotates integrally with the motor spindle 25 causes wind to flow from the rear side to the front side inside the tool body 15 by the integral rotation with the motor spindle 25. . That is, the motor cooling fan 27 acts to suck the outside air from the intake portion 45 so as to cool each member constituting the drive motor 23 by rotating. Specifically, as shown in FIG. 10, outside air existing outside the filter device 40 is sucked into the filter device 40 from an intake port 48 that is partitioned and opened by a tangential guide wall 471 and a guide support wall 472. Then, an intake airflow (thick line W1 in FIG. 10) is formed. Here, since four intake portions 45 having the intake ports 48 are arranged at equal intervals with respect to the peripheral surface 431 of the cylindrical intake portion 43, the intake portions 45 are sucked into the cylindrical intake portion 43. The intake airflow (thick line W1 in FIG. 10) is generated at a uniform interval with good balance.

Here, when the outside air sucked from the intake port 48 enters the centrifugal separation chamber 55, the intake guide portion 47 (tangential guide wall 471, guide support wall 472) shown in FIG. The airflow guide cylinder 51 (guide cylinder 53) is guided so as to generate a rotating airflow (thick line W2 in FIG. 11). That is, the rotating airflow (thick line W2 in FIG. 11) formed by the intake guide portion 47 and the airflow guide cylinder portion 51 is guided from the intake port 48 toward the centrifuge chamber 55 (front side in the figure) while being guided by the airflow guide cylinder portion 51. To the rear side of the figure). Here, the rotating airflow (thick line W2) transferred to the centrifuge chamber 55 in this way exhibits a centrifuge function in the centrifuge chamber 55 by this rotation.
That is, as shown in FIG. 11, the rotating airflow (thick line W2) in the centrifugal separation chamber 55 is divided into a relatively heavy dust and the like, and a relatively cool motor cooling air by a centrifugal separation function of the rotating airflow. Acts like centrifuging. Specifically, as shown in FIG. 11, the rotating airflow (thick line W2) that has entered the centrifugal separation chamber 55 removes dust or the like (indicated by the reference symbol D) mixed in the rotating airflow (thick line W2) in the centrifugal separation chamber 55. It acts to press against the inner wall surface 425 so as to stick to the wall surface 425. On the other hand, the airflow that enters the airflow guide cylinder portion 51 from the centrifuge chamber 55 becomes clean air from which dust or the like (denoted D in the figure) scattered on the inner wall surface 425 of the centrifuge chamber 55 is removed. . That is, the rotating airflow (thick line W2 in FIG. 11) that has entered the centrifugal separation chamber 55 acts to remove the outside air mixed with dust and the like toward the tool body 15 as motor cooling air that becomes clean air. Will be sent. Note that this rotating airflow (thick line W2 in FIG. 11) is formed by the intake airflow (thick line W1 in FIG. 10) sucked into the inside of the cylindrical intake portion 43 with a good balance at equal intervals as described above. An airflow rotating in a well-balanced manner inside the cylindrical intake portion 43 can be obtained.

  Incidentally, as shown in FIG. 11, dust or the like (denoted D in the figure) scattered on the inner wall surface 425 of the centrifuge chamber 55 is separated from the above-described intake portion 45 as a separated product in the centrifuge chamber 55. It can be discharged to the outside. In other words, the intake section 45 described above also functions as a discharge section for discharging the separated material separated in the centrifugal separation chamber 55 to the outside. Specifically, the intake port 48 constituting the intake unit 45 functions as a discharge port for discharging the separated material separated in the centrifugal separation chamber 55 to the outside. Further, the inner wall surface 425 of the conical portion 422 facing the centrifugal separation chamber 55 is formed so as to extend in a direction inclined with respect to the horizontal direction when the disc grinder 10 is in a regular stationary posture. For this reason, when the suction of the outside air from the intake portion 45 is stopped, the separated material separated in the centrifugal separation chamber 55 along the direction in which the inner wall surface 425 is inclined is changed to the intake portion by the dead weight of the separated material. It has a discharge guide function that acts to discharge from 45 to the outside. Specifically, as shown in FIG. 12, when the suction of the outside air from the intake section 45 is stopped by the rotation of the motor cooling fan 27, the centrifugal separation function using the above-described rotating air flow (thick line W2 in FIG. 11). The dust or the like (denoted by reference sign D) that has spread on the inner wall surface 425 of the conical portion 422 can be rolled toward the intake portion 45 by the horizontal inclination of the inner wall surface 425 of the conical portion 422. As described above, the dust or the like (reference symbol D) that rolls under its own weight from the inner wall surface 425 that has stuck to the suction portion 45 due to the horizontal inclination of the inner wall surface 425 is automatically transmitted to the outside from the suction port 48 that constitutes the suction portion 45. Will be discharged. Note that, when the outside air is sucked from the intake portion 45 by the rotation of the motor cooling fan 27, dust or the like (indicated by D in the drawing) mixed in the outside air is separated from the conical portion 422 by the centrifugal separation function using the rotating airflow. It remains pressed against the inner wall surface 425.

According to the filter device 40 of the first embodiment described above, the following operational effects can be obtained.
That is, according to the filter device 40 described above, the centrifuge chamber 55 that exhibits a centrifuge function is provided by the suction air sucked into the tool body 15, so that dust and the like (dust and water droplets) are mixed. A filtering effect for separating the outside air into clean air can be exhibited, and clean air can be supplied into the tool body 15. At this time, the dust or the like mixed in the outside air is only separated from the clean air by the centrifugal separation function, so that the dust does not adhere to or accumulate on the intake portion 45. In addition, when the centrifugal separation function of the centrifugal separation chamber 55 is stopped depending on the stop of the suction air sucked into the tool main body 15, the intake portion 45 removes the separated material in the centrifugal separation chamber 55. Since it is formed so that it can be discharged to the outside, the separated outside air (dust etc.) separated in this way can be discharged to the outside by stopping the suction air without accumulating in the centrifuge chamber 55. Thereby, the pressure loss at the time of attracting outside air can be eliminated, and the air volume to be supplied can be maintained over a long period of time. As a result, the outside air sucked into the tool body 15 is sufficiently filtered, and maintenance is not required (maintenance-free) without cleaning the accumulated dust (such as dust and water droplets). Convenience can be improved. According to the filter device 40 described above, the separated matter (dust etc.) of the outside air separated from the clean air by the centrifugal separation function can be discharged outside without accumulating in the centrifugal separation chamber 55. The storage box for storing the battery can be made unnecessary, and the entire tool can be downsized when mounted.

  Further, according to the filter device 40 described above, the air intake portion 45 is provided in the centrifuge chamber when the centrifuge function of the centrifuge chamber 55 is stopped depending on the stop of the suction air sucked into the tool body 15. Since the separation separated in 55 is automatically discharged to the outside through the intake portion 45 due to the weight of the separation, the centrifugal separation function can be achieved simply by stopping the drive motor 23 of the tool body 15. The separated air (such as dust) separated by the above can be automatically discharged outside without accumulating in the centrifuge chamber 55. As a result, for example, a simple operation for discharging a separated object (such as dust) such as shaking a tool can be eliminated, and the tool can be easily used. Further, according to the filter device 40 described above, the outer portion functions as a grip for the mounted tool body 15, so that the grip of the tool body 15 can be formed simply by mounting the filter device 40 to the tool body 15. it can. As a result, the function as the filter device 40 described above and the function of the grip of the tool body 15 can be combined, and the entire tool can be made compact. Further, according to the filter device 40 described above, since a plurality of the intake portions 45 are arranged at intervals with respect to the peripheral surface of the device housing 41, an intake region for sucking outside air can be secured. Therefore, it is possible to secure a sufficient air volume of the supply air filtered. Furthermore, when the separated outside air separated matter (dust etc.) is discharged to the outside from the intake portion 45, the discharge area can be secured in a plurality of directions. As a result, the air volume of the filtered supply air can be sufficiently secured, and the separated matter can be discharged from the intake portion 45 to the outside regardless of the posture of the tool.

  Further, according to the filter device 40 described above, the air intake portion 45 is disposed at a position in the gravitational direction with respect to the peripheral surface of the device housing 41 in the regular stationary posture of the tool body 15 to which the filter device 40 is mounted. Therefore, when the separated air (dust, etc.) separated in the regular stationary posture of the tool body 15 is discharged from the intake portion 45 to the outside, it is discharged from the intake portion 45 to the outside by its own weight. It can be made easy. Thereby, the function of discharging the separated material in the regular stationary posture can be further enhanced. Further, according to the filter device 40 described above, the tool main body 15 is configured as the main body of the disc grinder 10 that is a hand-held electric tool, the power source is configured by the electric drive motor 23, and the suction air is supplied from the drive motor 23. The wind is generated by the motor cooling fan 27 attached to the motor spindle 25 and sucked as the motor spindle 25 rotates. Thus, the air filtered by the filter device 40 described above can be used as motor cooling air for cooling the drive motor 23.

[Second Embodiment]
Next, a second embodiment for carrying out the filter device according to the present invention will be described. The second embodiment described below is different from the first embodiment in the configuration of the filter device 40 attached to the tool body 15. Therefore, in the second embodiment described below, only the configuration of the filter device 40A will be described with reference to FIGS. 13 to 15 are action schematic diagrams corresponding to FIGS. 10 to 12 in the description of the first embodiment. That is, FIG. 13 is an action schematic diagram schematically showing the outside air sucked into the filter device 40A according to the second embodiment. FIG. 14 is a schematic operation diagram schematically showing the centrifugal separation in the filter device 40A of FIG. FIG. 15 is an operation schematic diagram schematically showing the discharge of the separated matter inside the filter device 40A of FIG. In the filter device 40A according to the second embodiment, the same components as those of the filter device 40 according to the first embodiment described above are denoted by the same reference numerals and description thereof is omitted. .
The filter device 40A according to the second embodiment is different from the filter device 40 according to the first embodiment in the arrangement structure of the intake portion 45A (intake guide portion 47A). That is, the intake guide portion 47 of the filter device 40 according to the first embodiment is provided outside the housing opening 46, but the intake guide of the filter device 40A according to the second embodiment. The portion 47A is provided inside the housing opening 46. That is, in the filter device 40A of the second embodiment, the intake guide portion 47A is provided inside the peripheral surface 431 of the cylindrical intake portion 43, as compared with the filter device 40 of the first embodiment. In addition, the outside air sucked into the centrifuge chamber 55 through the intake portion 45A is sucked so as to become a rotating airflow (thick line W2 in FIG. 12) that exhibits a centrifuge function in the centrifuge chamber 55. The points agree.

Specifically, the intake guide portion 47 </ b> A also enters the inside of the device housing 41 where the sucked outside air generated by the rotation of the motor cooling fan 27 enters from the tangential direction of the peripheral surface 431 of the cylindrical intake portion 43. Designed. The intake guide portion 47A is formed by providing an intake port 48A on the peripheral surface 431 of the cylindrical intake portion 43 so as to open a tangential direction of the peripheral surface 431. In other words, the intake guide portion 47A includes a tangential guide wall that extends in the tangential direction of the peripheral surface 431 of the cylindrical intake portion 43, 471A, and a guide support wall 472A that supports the tangential guide wall 471A. Here, the air inlet 48 </ b> A opened by the tangential guide wall 471, and the guide support wall 472 is formed so that the opening direction faces the tangential direction of the peripheral surface 431. The intake port 48 </ b> A formed in this way is also formed in a slit shape extending along the rotational axis direction of the motor spindle 25.
Even when the filter device 40A according to the second embodiment is replaced with the filter device 40 according to the first embodiment and the disc grinder 10 is configured, a centrifugal separation function for separating the separated material and a function for discharging the separated material are provided. The same effects as in the first embodiment described above can be obtained. Furthermore, according to the second embodiment, the intake guide portion 47A is provided on the inner side of the peripheral surface 431 of the cylindrical intake portion 43, so that it can be compared with the first embodiment. The protrusion amount of the intake guide portion 47A from the peripheral surface 431 of the cylindrical intake portion 43 can be eliminated. That is, when the outer portion of the filter device 40 is caused to function as a grip of the disc grinder 10, it can be gripped along the shape of the peripheral surface 431 of the cylindrical intake portion 43. As a result, it is possible to improve the feel when gripping the outer part of the filter device 40 as a grip.

The filter device according to the present invention is not limited to the above-described embodiment, and may be configured by appropriately changing the location as follows.
For example, in the above-described embodiment, the disk grinder 10 is described as an example of a hand-held power tool. However, the tool according to the present invention is not limited to the power tool in which the power source described above is set to an electric drive motor, and may be a tool in which the power source is set to a gasoline engine, for example. Further, the hand-held power tool according to the present invention is not limited to the above-described disc grinder 10, but a drive motor driven by power supply, such as a hand-held power jigsaw or a hand-held power reciprocating saw, for example. Any hand-held power tool configured as a power source may be used. That is, in the disk grinder 10 described above, suction air that becomes motor cooling air is obtained by the built-in motor cooling fan 27. However, the suction air according to the present invention is not limited to this, as long as it becomes the outside air sucked into the inside of the tool main body by an appropriate power source such as the intake air of the gasoline engine described above. It ’s good.
Further, in the above-described embodiment, by simply stopping the drive motor 23 of the tool body 15, the separated air (dust etc.) separated by the centrifugal separation function is not accumulated in the centrifugal separation chamber 55. It was configured to be automatically discharged to the outside. However, the filter device according to the present invention is not limited to this, and when the centrifugal separation function of the centrifugal separation chamber 55 is stopped depending on the stop of the suction air sucked into the tool body 15, The disc grinder 10 itself as a tool may be shaken appropriately to discharge the above-described separated matter (dust etc.).
Further, in the above-described embodiment, a hand-held power tool is exemplified and described as a tool to which the filter device according to the present invention is attached. However, the filter device according to the present invention is not limited to this, and may be mounted on a stationary power tool such as a sliding marnoco.

Further, the filter devices 40 and 40A of the above-described embodiment are configured to include the device housing 41, the centrifugal separation chamber 55, and the intake portions 45 and 45A. However, the filter device according to the present invention is not limited to this, and employs an appropriate configuration that separates outside air sucked into the outside air suction side into motor cooling air for cooling the motor by a centrifugal separation function. be able to. Further, the air intake part of the filter device according to the present invention is not limited to the example of the air intake parts 45 and 45A of the above-described embodiment, but is provided on the peripheral surface of the apparatus housing and sucks outside air into the centrifuge chamber. And what is necessary is just to function as a discharge part for discharging the isolate | separated material isolate | separated in the centrifuge chamber outside.
In the filter devices 40 and 40A according to the above-described embodiment, the outside air sucked from the intake portion 45 is separated into the motor cooling air and the dust (such as dust and water droplets) described above. However, the filter device according to the present invention may separate water such as water droplets from the outside air sucked from the intake portion and send it to the tool body as motor cooling air. Further, the discharge guide shape according to the present invention is not limited to the example of the inner wall surface 425 of the conical portion 422 of the above-described embodiment, and when the suction of the outside air from the intake portion is stopped, An appropriate shape can be selected as long as it has a function of discharging the separated product by the dead weight of the separated product. Further, an anti-slip function for improving the grip performance as the disc grinder 10 may be provided on the outer portion of the filter devices 40 and 40A.

Further, four intake portions 45, 45A provided in the filter devices 40, 40A of the above-described embodiment are arranged at equal intervals with respect to the peripheral surface 431 of the cylindrical intake portion 43 (device housing 41). It was a thing. However, the intake portions according to the present invention are not limited to this, and for example, three intake portions may be arranged at appropriate intervals. In other words, the air intake section according to the present invention is only required to have a preferable area for generating the rotating airflow while ensuring the air volume as the motor cooling air, and further from the air intake section due to the weight of the separated object. It is preferable that it is designed to be easily discharged.
In addition, the intake portions 45 and 45A provided in the filter devices 40 and 40A according to the above-described embodiment are configured to be removable from the motor housing 22 serving as a main body housing of the tool main body 15. However, the filter device according to the present invention is not limited to this, and may be formed by integral molding with a motor housing serving as a main body housing.

10 Disc grinder (electric tool)
DESCRIPTION OF SYMBOLS 15 Tool main body 18 Cover body 20 Power generation part 22 Motor housing 23 Drive motor (power source)
24 Bearing 25 Motor spindle (Rotating shaft)
27 Motor cooling fan 29 Connection portion 30 Power conversion portion 32 Gear housing 33 Drive side gear 35 Drive side gear 37 Output spindle 38 Bearing 39 Exhaust port 40, 40A Filter device (separation device)
41 device housing 42 conical bottom 421 bottom 422 conical 425 inner wall surface (wall surface of partition wall)
43 Cylindrical air intake portion 431 Peripheral surface 45, 45A Air intake portion 46 Housing opening portion 47, 47A Air intake guide portion 471, 471A Tangential guide wall 472, 472A Guide support wall 48, 48A Air intake port 50 Connection portion 51 Airflow guide cylinder portion (air flow Guide part)
52 Superposition part 53 Guide cylindrical part 531 Rear end opening part 54 Connection cylinder part 541 Front end opening part 55 Centrifugal separation chamber B Grinding wheel

Claims (8)

A filter device configured to be attachable to a tool body and performing filtration such as dust removal for outside air sucked into the tool body by a power source provided in the attached tool body,
An apparatus housing provided with a centrifuge chamber that exhibits a centrifuge function by suction air sucked into the inside of the tool body, and outside air that is provided on the peripheral surface of the apparatus housing is sucked into the centrifuge chamber. And an intake section
When the centrifugal function of the centrifugal separation chamber is stopped depending on the stop of the suction air sucked into the tool body, the air intake portion discharges the separated material to the outside. A filter device characterized by being formed. The filter device according to claim 1,
When the centrifugal separation function of the centrifugal separation chamber is stopped depending on the stop of the suction air sucked into the tool body, the suction portion removes the separation separated in the centrifugal separation chamber. The filter device is configured to be automatically discharged to the outside through the intake portion due to its own weight. The filter device according to claim 1 or 2,
An airflow guide portion that guides outside air sucked from the air intake portion so as to generate an airflow in the centrifugal separation chamber, is provided inside the device housing. The filter device according to any one of claims 1 to 3,
The filter device according to claim 1, wherein a plurality of the intake portions are disposed with a space from the peripheral surface of the device housing. The filter device according to any one of claims 1 to 4,
The position of the air intake portion disposed on the peripheral surface of the device housing is a position facing the gravity direction with respect to the peripheral surface of the device housing in the regular stationary posture of the tool body on which the filter device is mounted. A filter device that is set. The filter device according to any one of claims 1 to 5,
The outer side part functions as a grip of the said tool main body with which it was mounted | worn, The filter apparatus characterized by the above-mentioned. The filter device according to any one of claims 1 to 6,
The tool body is configured as a body of a hand-held power tool,
The power source is composed of an electric drive motor,
The filter device according to claim 1, wherein the suction air is a wind generated by a motor cooling fan attached to a rotation shaft of the drive motor and sucked along with the rotation of the rotation shaft.   A power tool configured to include a power source, wherein the filter according to any one of claims 1 to 7 is disposed upstream of suction of outside air sucked into the tool body by the power source. A power tool characterized in that the device is mounted.

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