CN113799068A

CN113799068A - Dust extraction device and hand-held power tool

Info

Publication number: CN113799068A
Application number: CN202110664507.7A
Authority: CN
Inventors: F·施莱格尔; H·弗勒林
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-06-16
Filing date: 2021-06-16
Publication date: 2021-12-17
Also published as: DE102020207395A1

Abstract

The invention relates to a suction device for a hand-held power tool, comprising a housing (38), in which a dust chamber (58) for receiving dust and a filter unit (68) for filtering an air flow are arranged, wherein the housing (38) comprises an air duct (63) which is provided for conducting the air flow through the suction device (36), in particular the dust chamber (58), and a housing interface (46) which is designed for mechanically connecting the suction device (36) to the hand-held power tool (10). The dust chamber (58) has a base body (85) and at least one volume expansion element (83). The invention also relates to a corresponding hand-held power tool.

Description

Dust extraction device and hand-held power tool

Technical Field

The invention relates to a suction device and a hand-held power tool.

Background

An accessory device in the form of a removable suction part is described in DE 102017201558 a 1. The accessory device has a dust collection bin.

Disclosure of Invention

The invention relates to a suction device for a hand-held power tool, comprising a housing, in which a dust chamber for receiving dust and a filter unit for filtering an air flow are arranged, wherein the housing comprises an air channel for guiding the air flow through the suction device, in particular the dust chamber, and a housing interface configured for mechanically connecting the suction device to the hand-held power tool. It is proposed that the dust chamber has a base body and at least one volume expansion element. Preferably thereby increasing the capacity of the dust collecting chamber.

The suction device is preferably designed as an attachment for a hand-held power tool, the hand-held power tool also being used without the attachment. The suction device is in particular designed to suck off dust, for example drilling/grinding/sawing dust during the machining of workpieces by means of a hand-held power tool. The air flow is guided in operation via the air channel. The air flow can be generated in particular by means of a fan unit. The fan unit can be arranged in the suction device, the hand-held power tool or an external vacuum cleaner. The suction device comprises at least one fan element, which may be configured, for example, as a radial fan or as an axial fan.

Hand-held power tools can be configured, for example, as electric hammers, electric drills, percussion drills, angle grinders, saber saws, etc., wherein these power tools have in common that drilling/grinding/sawing dust is generated during operation. The hand-held power tool can be designed as a mains or battery appliance.

The housing interface of the suction device is in particular designed for the non-positive and/or positive connection of the suction device to the hand-held power tool, in particular of the housing of the suction device to the housing of the hand-held power tool. A "releasable connection" is to be understood in the context of the present application to mean, in particular, a connection that can be released without tools. The housing interface has, in particular, at least one guide element for guiding the suction device when the hand-held power tool is connected to the housing interface or when the hand-held power tool is released from the housing interface. The guide element is preferably designed as a guide rail. It is also conceivable for the mechanical interface to have a locking unit for locking the suction device and the hand-held power tool. The locking unit preferably has at least one locking element and at least one actuating element for actuating the locking unit, wherein the locking can be released by the actuation. It is also conceivable, in addition, for the suctioning device to have an electrical interface, via which the suctioning device can be supplied with energy, exchange information, or controlled, for example.

The dust collecting chamber is in particular designed to receive dust generated during operation of the hand-held power tool. The dust collecting chamber is especially arranged such that the airflow is at least partly guided through the dust collecting chamber. In particular the dust chamber has a dust chamber housing. The dust collecting chamber housing may be integrated in the housing of the suction device or alternatively be configured to be releasably connectable with said housing. The dust collecting chamber has an inlet through which the airflow enters the dust collecting chamber and an outlet through which the airflow leaves the dust collecting chamber. The inlet and outlet of the dust collecting chamber are preferably configured to be separated from each other. It is furthermore conceivable that the dust chamber has an emptying opening for emptying the dust chamber. Preferably, the emptying opening is designed to be closable, for example by means of an emptying flap.

The filter unit is arranged to filter dust out of the airflow. The filter unit is arranged in particular in the region of the outlet of the dust collecting chamber. The filter unit is in particular releasably connectable to the suction device, preferably to a dust chamber of the suction device. The filter unit has at least one filter element. The filter element can be made of felt, nonwoven, woven, paper or the like, for example. The filter element is in particular designed as a microfilter or fine filter, preferably as a HEPA filter.

The dust collecting chamber has in particular only one chamber, wherein the base body and the volume expansion element are designed as different regions of the chamber. Preferably, the dust collecting chamber has a coherent inner wall. The base body is in particular of substantially box-shaped or rectangular or trapezoidal design. The base body can have sharp or rounded or flat edges. The volume expansion element is directly engaged to an area of the base body. If the dust chamber has a dust chamber housing, the dust chamber housing comprises both the base body and the volume expansion element. The dust collection chamber housing is preferably constructed of plastic. The dust collecting chamber or the dust collecting chamber housing is preferably partially or completely transparent.

It is also proposed that the volume expansion element is arranged on a side of the suction device facing the hand-held power tool. Advantageously, the center of gravity of the suction device is thereby shifted in the direction of the hand-held power tool. The suction device can have one or more sides facing the hand-held power tool. In particular, the side of the housing interface and the adjacent side of the hand-held power tool are arranged facing each other.

It is further proposed that the dust collecting chamber has a slot arranged adjacent to said volume expanding element. In particular the slot abuts on the volume expansion element. The slot preferably extends from a region in which, on an imaginary straight line, the volume expansion element is cut off on one side and the base body of the dust chamber or a further volume expansion element on the other side. It is also proposed that the slots be concavely or angularly configured.

It is further proposed that the dust chamber has a dust chamber housing which can be releasably connected to the housing of the hand-held power tool. The dust collecting chamber can advantageously be removed therefrom for cleaning. A releasable connection is understood in this context to mean, in particular, a connection which can be released without tools. The connection can be made, for example, by a force-locking and/or form-locking connection, in particular by a latching connection.

The invention also relates to a hand-held power tool having the suction device. A particularly compact system can thus advantageously be provided, the center of gravity of the entire system of which is improved.

It is also proposed that the hand-held power tool have a housing and a tool receiver for receiving an application tool, wherein the application tool can be driven about or along a working axis, wherein the volume expansion element is arranged completely in a region in which a plane is arranged, which plane is orthogonal to the working axis and intersects the hand-held power tool housing. In particular the base body of the dust collecting chamber, is spaced apart from said plane.

It is also proposed that the housing of the hand-held power tool be arranged between two volume expansion elements. In particular, the dust chamber is shaped and arranged in such a way that it encloses the hand-held power tool housing on one side. In particular, the housing of the suction device rests partially or completely against the housing of the hand-held power tool in the surrounding area.

It is also proposed that the maximum width of the suction device is greater than the maximum width of the hand-held power tool by more than 10%, in particular more than 25%, preferably more than 40%. Advantageously, this can ensure a compact configuration of the system in terms of length. It is also proposed that the hand-held power tool be widened symmetrically by means of a suction device. The two volume expansion elements, between which the hand-held power tool housing is arranged, are particularly preferably of substantially identical design or of mirror-symmetrical design.

It is also proposed that the hand-held power tool has a drive unit with an electric motor, wherein the electric motor is mounted so as to be rotatable about a motor axis, wherein the motor axis and the working axis are arranged crosswise, in particular perpendicular, to one another, wherein the dust collecting chamber is designed such that the motor axis is partially or completely surrounded over an angular range of at least 120 °, preferably at least 150 °, and most preferably at least 180 °. Advantageously, the installation space can be optimally adapted thereby. In particular, the slot is adapted to the housing geometry of the housing of the hand-held power tool in the region of the housing interface. Preferably, the contour of the slot substantially follows the contour of the housing of the hand-held power tool.

It is also proposed that the suction device has an electric motor with a motor axis, wherein the motor axis lies substantially in a center plane of the hand-held power tool. The center plane is developed here in particular by the working axis and the motor axis of the hand-held power tool. Advantageously, the dust collecting chamber and/or the filter unit also intersect the middle plane.

Drawings

Further advantages are obtained from the following description of the figures. The figures and description contain several features taken in combination. Those skilled in the art will also be able to appropriately view and generalize these features individually and in other combinations of significance.

The figures show:

fig. 1 shows a side view of a hand-held power tool and a suction device in an uncoupled state;

FIG. 2 shows a perspective view of a gettering device;

fig. 3 shows a side view of the hand-held power tool and the suction device in the connected state;

fig. 4 shows a sectional view of the hand-held power tool and the suction device in the connected state.

Detailed Description

Fig. 1 shows a side view of a hand-held power tool 10 with a suction device 36. The hand-held power tool 10 is configured as an electric hammer. The hand-held power tool 10 has a housing 12 configured as an outer housing. A drive unit 14 and a transmission unit 18 are arranged in the housing 12 of the hand-held power tool 10, the drive unit 14 comprising an electric motor 16, and the transmission unit 18 comprising an impact mechanism 20, which is configured as a pneumatic impact mechanism in an exemplary manner. A tool receiver 21 is arranged on the front end of the hand-held power tool 10, in which tool receiver 21 an application tool 22 can be releasably fastened. The application tool 22 is illustratively configured as a rock bit. The application tool 22 is configured to be drivable in rotation about a working axis 24 and/or in linear oscillation along the working axis 24. At the rear end of the hand-held power tool 10, a handle 26 is arranged, which handle 26 extends along a handle axis 28. The handle axis 28 is arranged substantially perpendicular to the working axis 24. An operating switch 30 is arranged on the handle 26, the operating switch 30 being manually actuatable, and the hand-held power tool 10 being able to be switched on and off by means of the operating switch 30. An operating mode switch 32 is also arranged on the upper side of the housing 12 of the hand-held power tool 10. The operation mode switch 32 is configured to switch to either a left-turn operation or a right-turn operation.

Fig. 1 also shows a longitudinal section of the suction device 36. The suction device 36 has a housing 38 configured as an outer housing. The suction device 36 has a telescopic unit 40 with a telescopic tube 39, the telescopic unit 40 being supported in a linearly movable manner in the housing 38 of the suction device 36. The movement of the telescopic unit 40 takes place along a telescopic axis 41, the telescopic axis 41 being configured in the exemplary manner substantially parallel to the working axis 24 of the hand-held power tool 10.

At the front end of the telescopic unit 40 facing away from the housing 38 of the suction device 36, a suction head 42 is arranged. The suction head 42 is configured to be movable relative to the housing 38 of the suction device 36 by means of the telescopic unit 40. The suction head 42 has an application tool through opening 44. The application tool passage opening 44 is configured in the exemplary manner as a hollow cylinder and extends substantially coaxially to the working axis 24 of the hand-held power tool 10. In operation of the system comprising the hand-held power tool 10 and the suction device 36, the application tool 22 is guided through the application tool passage opening 44. The telescopic unit 40 is shown in fig. 1 in an extended state, in which the telescopic unit 40 is at a maximum distance from the housing 38 of the suction device 36 on the basis of a spring preload (not shown in detail).

The housing 38 of the suction device 36 is connected to the hand-held power tool 10, in particular to the housing 12 of the hand-held power tool 10, via a housing interface 46. The housing interface 46 has two guide rails 48, which extend, for example, substantially parallel to the telescopic axis 41 or the working axis 24 of the hand-held power tool 10. The guide rail 48 projects beyond the housing 38 of the suction device 36 on the side of the suction device 36 facing away from the suction head 42. The guide rail 48 terminates, for example, in a bearing nose 49, which bearing nose 49 is provided for being received in a corresponding receptacle (not shown in detail) of the hand-held power tool. The suction device 36 is thus configured to push the sleeve onto the hand-held power tool 10 from the front side. The mechanical housing interface 46 also has a locking unit, not shown in detail, for locking the suction device 36 with the hand-held power tool 10.

The suction device 36 also has a dust collection chamber 58. The dirt collection chamber 58 is illustratively configured as an interior region of the housing 38 of the suction device 36. The dust chamber 58 is thus constructed integrally with the housing 38 of the suction device 36. Alternatively, it is likewise conceivable for the dust chamber 58 to be releasably connected to the housing 38 and to be designed, as an example, to be connectable to the housing 38 via a snap-on connection. The dust chamber 58 is arranged on the side of the suction device 36 facing the hand-held power tool 10. The dust chamber 58 is arranged in particular on the side of the suction device 36 facing the housing interface 46. The dust chamber 58 also has a emptying flap, not shown in detail, for emptying.

In operation, an air flow is generated by means of the fan unit 62, which air flow is provided for sucking off dust at the working location of the application tool 22. The fan unit 62 is illustratively disposed in the housing 38 of the gettering device 36. Alternatively, it is also conceivable for the fan unit 62 to be arranged in the housing 12 of the hand-held power tool 10. The fan unit 62 has a fan 61, which is configured as a radial fan and is provided for generating an air flow in the suction device 36 in an exemplary manner. The fan 61 is connected to the motor shaft of the motor 60 in a rotationally fixed manner and is driven by it. The motor 60 is rotatably supported about a motor axis 70.

The air flow is conducted in the suction device 36 through an air channel 63, the air channel 63 having a suction opening 64 and an outlet 66, the air flow entering the air channel 63 through the suction opening 64, the air flow leaving the suction device 36 via the outlet 66. The suction opening 64 is arranged in the region of the suction head 42, in particular in the region of the application tool through opening 44. The air flow is thus sucked in via the suction opening 64 in the region of the suction head 42 and conducted into the dust collecting chamber 58 via the air passage 63 through the bellows 39 of the telescopic unit 40. A filter unit 68 is arranged in the dust collecting chamber 58, the filter unit 68 being configured for filtering out dust from the airflow. The airflow exits the dirt collection chamber 58 via the filter unit 68 and is conducted to the outlet 66. The filter unit 68 has a filter element 78. The filter element 78 is illustratively configured as a HEPA filter. The filter unit 68 or the filter element 78 projects into the dust chamber 58. In particular, the filter unit 68 is designed to be freely suspended, so that it does not rest against the inner wall of the dust chamber 58.

The dirt collection chamber 58 and the filter unit 68 are disposed substantially entirely between the telescoping axis 41 and the motor axis 70. The motor axis 70 extends here, for example, parallel to the working axis 24 of the hand-held power tool and parallel to the telescopic axis 41 of the suction device 36. Alternatively, it is also conceivable for the motor axis 70 to be arranged offset and intersecting or perpendicular to the working axis 24 and/or the telescopic axis 41. The motor 60 is arranged below the dust chamber 58. The fan 61 is arranged on the side of the suction device 36 facing away from the hand-held power tool 10 or facing the suction head 42.

A perspective view of the gettering device 36 is shown in fig. 2. The housing 38 has a substantially U-shaped region 80 in plan view. The housing interface 46 is arranged in the U-shaped area 80. The U-shaped region 80 of the housing 38 is thus arranged on the side of the suction device 36 facing away from the suction head 24. The U-shaped region 80 has two arms 82 which are connected to each other via a back 84. The two arms 82 extend here substantially parallel to one another. The back 84 extends substantially perpendicular to the two arms 82. The dust chambers 58 are disposed in both the back 84 and the arms 82. In this case, the base body 85 of the dust chamber 58 is arranged on the rear side 84 and the two volume-expanding elements 83 of the dust chamber are arranged in the arms 82. The base body 85 of the dust chamber 58 is of substantially rectangular design. The two volume expansion elements 83 extend from the base body 85 in the direction of the hand-held power tool 10 and expand the dust-holding volume of the dust chamber 58.

A slot 86 is arranged between the two volume expansion elements 83. In the present embodiment, the notch 86 is illustratively configured to be substantially U-shaped in plan view. The slot 86 is preferably adapted to the housing geometry of the hand-held power tool 10, so that in the connected state there is substantially no play between the hand-held power tool 10 and the suction device 36.

Fig. 3 shows the hand-held power tool 10 in a connected state with the suction device 36. In the connected state, the suction device 36 is connected to the hand-held power tool 10 via the housing interface 46 in a non-positive and positive manner. The suction device 36 partially encloses the housing 12 of the hand-held power tool 10 in the connected state. In particular, the two arms 82 of the housing 38 of the suction device 36 enclose the housing 12 of the hand-held power tool 10 in the region of the electric motor 16 of the hand-held power tool 10.

Fig. 4 shows a cross section of the suction device 36 and the hand-held power tool 10 in the connected state. The housing 38 of the suction device 36 encloses the housing 12 of the hand-held power tool 10 in such a way that the notches 86 between the arms 82 are substantially completely filled by the hand-held power tool 10. In particular, the electric motor 16 of the hand-held power tool 10 is arranged partially between the volume expansion elements 83 of the dust chamber 58. A small cavity 88 is formed between the hand-held power tool 12 and the suction device 36, the size of which is minimized by the concave recess 86. The volume expansion element 83 is illustratively of a mirror-symmetrical configuration.

The width of the system is increased by the enclosure of the gettering device 36. In particular, the maximum width 90 of the suction device is approximately 60% greater than the width 92 of the hand-held power tool 12, in particular in the region surrounding the hand-held power tool 12.

The suction device 36 protrudes with an arm 82, in particular to the motor axis 17 of the electric motor 16 of the hand-held power tool 10. Starting from the motor axis 17 of the hand-held power tool 12, the suction device 36 surrounds the hand-held power tool 10 over an angular range of approximately 180 °.

Claims

1. A suction device for a hand-held power tool, having a housing (38) in which a dust chamber (58) for receiving dust and a filter unit (68) for filtering an air flow are arranged, wherein the housing (38) comprises an air channel (63) which is provided for guiding the air flow through a suction device (36), in particular the dust chamber (58), and the suction device has a housing interface (46) which is designed for mechanically connecting the suction device (36) to the hand-held power tool (10),

it is characterized in that the preparation method is characterized in that,

the dust chamber (58) has a base body (85) and at least one volume expansion element (83).

2. The suction device according to claim 1, characterized in that the volume expansion element (83) is arranged on a side of the suction device (36) facing the hand-held power tool (10).

3. Suction arrangement according to any one of the preceding claims, characterized in that a dust chamber (58) has a slot (86) arranged adjacent to the volume expansion element (83).

4. The suction device according to claim 3, characterized in that the notches (86) are concavely or angularly configured.

5. The suction device as claimed in one of the preceding claims, characterized in that the dust chamber (58) has a dust chamber housing which can be connected releasably to a housing (12) of the hand-held power tool (10).

6. Hand-held power tool having a suction device (36) according to one of claims 1 to 5.

7. Hand-held power tool according to claim 6, characterised in that the hand-held power tool (10) has a housing (12) and a tool receptacle (21) for receiving an application tool (22), wherein the application tool (22) can be driven about a working axis (24) or along the working axis (24), wherein the volume expanding element (83) is arranged completely in a region in which a plane (94) is arranged, which plane is orthogonal to the working axis (24) and intersects the housing (12).

8. Hand-held power tool according to claim 6 or 7, characterised in that the housing (12) of the hand-held power tool (10) is arranged between two volume expansion elements (83).

9. Hand-held power tool according to one of claims 6 to 8, characterized in that the maximum width (90) of the suction device (36) is greater than the width (92) of the hand-held power tool (10) by more than 10%, in particular by more than 25%, preferably by more than 50%.

10. Hand-held power tool according to one of claims 6 to 9, characterised in that the hand-held power tool (10) is symmetrically widened by means of a suction device (36).

11. Hand-held power tool according to one of claims 6 to 10, characterized in that the hand-held power tool (10) has a drive unit (14) having an electric motor (16), wherein the electric motor (16) is rotatably mounted about a motor axis (17), wherein the motor axis (17) and the working axis (24) are arranged crosswise, in particular perpendicular to one another, wherein the dust collection chamber (58) is designed such that the motor axis (17) of the hand-held power tool (10) is surrounded over an angular range of at least 120 °, preferably at least 150 °, preferably at least 180 °.

12. The hand-held power tool according to one of claims 6 to 11, characterized in that the suction device (36) has a motor (60) having a motor axis (70), wherein the motor axis (70) lies substantially in a middle plane of the hand-held power tool (10).