CN114191891A

CN114191891A - Electric tool and cyclone separation unit thereof

Info

Publication number: CN114191891A
Application number: CN202010907623.2A
Authority: CN
Inventors: 陈羽; 陈锋
Original assignee: Bosch Power Tools China Co Ltd
Current assignee: Bosch Power Tools China Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2022-03-18

Abstract

The application discloses electric tool and whirlwind separating unit thereof, electric tool includes that casing and group locate the tool assembly of casing, but tool assembly is including the terminal output shaft of clamping cutter, motor and the fan of the terminal output shaft of drive, whirlwind separating unit include the air inlet, with the whirlwind separation chamber of air inlet intercommunication, through the opening at top with the whirlwind dust collection chamber of whirlwind separation chamber intercommunication and with whirlwind separation chamber intercommunication is located the gas outlet of whirlwind separation chamber internal week, the relative top of whirlwind separating unit definition and bottom, the opening at top set up in the position that whirlwind separating unit is close to the top. Because the cyclone dust collection chamber and the cyclone separation chamber are communicated only through the opening at the top of the top, the cyclone dust collection chamber and the cyclone separation chamber are kept in relatively stable isolation, and dust is deposited from the bottom due to gravity, when the cyclone dust collection chamber is decelerated or stopped and then started, the dust collection chamber is not easy to suck back, and the separation effect is ensured.

Description

Electric tool and cyclone separation unit thereof

Technical Field

The present application relates to power tools, and more particularly to power tools having cyclonic separation assemblies.

Background

In order to reduce impurities in a cooling air flow passing through a motor, such as a motor used in a power tool, a unit for cyclone-separating impurities in the air by centrifugal action is increasingly widely used. The main principle is that the dust-containing air passes through the cyclone separation chamber, so that large-mass particulate matters such as dust in the air are driven by cyclone airflow to rotate in the cyclone separation chamber, and the cyclone separation chamber and the cyclone dust collection chamber are communicated in the whole circumferential direction, so that the particulate matters can be separated to the dust collection chamber under the action of centrifugal force, and purified air is generated.

However, during the operation of the cyclone separation unit, especially during the start-up or stop of the motor, because the strength of the rotating airflow is low and the centrifugal force of the particulate matter rotating in the cyclone separation chamber is small, the particulate matter is easily fallen back after being separated into the cyclone dust collection chamber or the negative pressure generated by the operation of the fan is sucked back into the separation chamber and enters the motor along with the air through the air outlet, so that the cleaning effect of the air is poor and the possibility of damaging the electric tool still exists.

Accordingly, there is a need for improvement to overcome the technical problems in the prior art.

Disclosure of Invention

What this application will solve is the dust problem of resorption in the cyclone dust collection chamber.

In order to solve the above technical problem, in one aspect, the present application provides an electric power tool including a housing and a tool assembly assembled to the housing, the tool assembly including: the cyclone separation unit comprises a cyclone shaft which is horizontally arranged and forms a first working posture relative to the top and the bottom, and the cyclone separation chamber is communicated with the cyclone dust collection chamber through an opening in the top.

In another aspect, the present application further provides a cyclone separation unit, including the air inlet, with the air inlet intercommunication and have the cyclone separation chamber of the lateral wall of awl tube-shape, through the opening with the cyclone dust collection chamber of cyclone separation chamber intercommunication and with cyclone separation chamber intercommunication is located the gas outlet of circumference in cyclone separation chamber, the lateral wall definition of awl tube-shape has the whirlwind axle, the opening set up in the lateral wall is limited to the region within 1/5 diameters of its place circular cross section, cyclone separation unit has the messenger whirlwind axle level is placed just the first work gesture at vertical direction top is placed in to the opening.

According to this application, owing to communicate whirlwind dust collection chamber and cyclone separation chamber are only through the opening intercommunication that is located the top at top, and the two keeps the isolation of relative stability and the dust begins the deposit by the bottom because of gravity, when slowing down or shut down restart, and collection dirt is also difficult to be inhaled back, guarantees the separation effect.

Drawings

The present application will be more fully understood by reference to the following detailed description of specific embodiments in conjunction with the accompanying drawings. Wherein:

fig. 1 is a schematic perspective view of a power tool according to the present application;

FIG. 2 is a schematic view of the cyclone separation unit of the present application shown disassembled without the power tool installed therein;

FIG. 3 is a schematic cross-sectional view of the power tool of FIG. 1;

FIG. 4 is a schematic sectional view of the cyclone separation unit shown in FIG. 3;

fig. 5 shows a schematic diagram of a side view of a cover of a cyclonic separating unit according to the present application, with the cover removed.

Detailed Description

The following describes in detail an embodiment of the power tool 100 according to the present application with reference to the drawings. For the basic working principle of the cyclone separation unit of the present application, reference may be made to the applicant's prior patent application WO2018149388a1, which is not described in detail here.

Referring to fig. 1 to 5, the electric tool 100 includes a housing 10 and a tool assembly assembled in the housing 10, the tool assembly includes: a tip output shaft 201 which can hold a cutter, a motor 203 which directly or indirectly drives the tip output shaft 201 through a motor shaft L1, and a fan 205 which can generate an air flow, the electric power tool 100 is provided with a cyclone separating unit 30 upstream of the air flow of the motor 205, the cyclone separation unit 30 has a cyclone axis L2 parallel to the motor axis L1 and includes an air inlet 301 (corresponding to the original air flow F1 in fig. 4 when in operation), a cyclone separation chamber 303 (corresponding to the cyclone air flow F2 in fig. 4 when in operation) communicating with the air inlet 301, a cyclone dust collection chamber 305 (corresponding to the dust collection air flow F2 in fig. 4 when in operation) communicating with the cyclone separation chamber 303 through an opening 309 at the top, and an air outlet 307 (corresponding to the cleaning air flow F4 in fig. 4 when in operation) communicating with the cyclone separation chamber 303 and located at the inner periphery of the cyclone separation chamber 303. The cyclone separating unit 30 includes a first operating posture (taking the angle grinder shown in the figure as an example, the first operating posture may be a posture in which the end output shaft 201 is perpendicular to the motor shaft L1 and parallel to the vertical direction) in which the cyclone shaft L2 is horizontally placed and opposite to the top and the bottom, and the cyclone separating chamber 303 communicates with the cyclone dust collecting chamber 305 through an opening 309 at the top. The opposite top and bottom mainly reflect the height relationship of the related structure in the gravity (vertical) direction, that is, the bottom is located below the gravity direction, and the top is located above the gravity direction). Since the cyclone dust collecting chamber 305 and the cyclone separating chamber 303 are communicated only through the opening 309 at the top of the top, they are kept relatively stably isolated and dust is deposited from the bottom due to gravity, and when the electric power tool 100 is decelerated or stopped and then started, the particulate matter is not easily sucked back, improving the separation effect. With particular reference to fig. 5, the opening 309 is provided in the side wall 3031 in a region above the diameter d (i.e. 0.8d) 4/5 of the circular longitudinal section in the first operating position. In other words, when the cyclonic separating unit 30 is not assembled to the housing 10 without the reference frame of power tools, the opening 309 is provided in the side wall 3031 and is limited to a region within diameter d of 1/5 of the circular cross-section in which it is located, but the cyclonic separating unit 30 has a first operating position in which the cyclone axis L2 is positioned horizontally and the opening 309 is positioned at the top in the vertical direction.

The electric power tool 100 has a second working posture (for example, an angle grinder having a grinding position in which the disk is parallel to the workpiece surface, i.e., the aforementioned first working posture, and also having a cutting position in which the disk is perpendicular to the workpiece surface, i.e., the second working posture described herein) formed by rotating about the motor shaft L1, and the opening 309 of the top portion is movably provided to the cyclone unit 30 so that the opening 309 of the top portion is maintained close to the top portion of the electric power tool 100 in the second working posture (it is understood that the respective positions of the bottom portion and the top portion are changed due to the change of the working posture of the electric power tool). The cyclonic separation chamber 303 has a conical cylindrical side wall 3031, the top opening 309 being located at the smaller diameter end of the conical cylindrical side wall 3031, the conical cylindrical side wall defining a cyclone axis L2 parallel to the motor shaft L1. The small diameter end is the rear portion of the cyclonic separation stroke and is also the area where dust collects and the top opening 309 is located where it is better to direct dust collection. Of course, when the side wall is cylindrical, the implementation of the basic function of the present application is not affected. In summary, the cyclone unit 30 rotates around the cyclone shaft L2 to form a second working posture and has a top corresponding to the second working posture, and the opening 309 is movably disposed on the cyclone unit 30 to keep the opening 309 at the top of the second working posture.

In particular, the opening 309 of the top can be maintained at the top of the second work position by self-adjustment of gravity or manual switching of the operating portion. In the embodiment, the electric tool is an angle grinder, and the end output shaft 201 is perpendicular to the motor shaft L1. It will also be appreciated that the different modes of operation of the angle grinder are mainly achieved by rotation about the motor shaft L1, and the specific internal structure thereof is such that the overall operational shape and position of the cyclonic separating unit 30 will not change due to the different modes of operation, and thus is well adaptable. The cyclone dust chamber 305 surrounds the circumference of the cyclone chamber 303 to make more use of the space of the cyclone unit 30. The cyclone dust chamber 305 further includes a cover 3053 movably opened to discharge dust. The cover 3053 is pivotally connected to the opening 309 side of the cyclone unit 30, i.e., the top of the cyclone unit 30, for discharging accumulated dust in time. The cyclone unit 30 further includes a housing locking portion 306 formed to extend from an end away from the cover 3053 toward the opening 309, so as to be locked to the housing 10 in a structure that is easy to operate by a thumb and an index finger of a human hand.

The above detailed description is merely illustrative of the present application and is not intended to be limiting. For example, the above embodiments have been described primarily in relation to the application of the present invention to angle grinders, and indeed, the cyclone separation unit may find wider application as a cyclone separation assembly in electric hammers, circular saws, electric drills, cutters and even in non-electric tools. Furthermore, the cyclone separation assembly of the present embodiment is mainly used for the pretreatment before the cooling air enters the motor, and in other cases, the cyclone separation assembly can be applied to the pretreatment before the polluted air is discharged to the outside as long as the polluted air is purified. In addition, the cyclone separation unit in the above embodiment is an independent functional module that is detachable from the housing, the power tool 100 has a module accommodating space 101 at the bottom of the housing 10, and the cyclone separation module 30 is installed into the module accommodating space 101 from the bottom of the power tool. After the cyclone separation module 30 is installed, the air inlet 301 is communicated with the air inlet grids 103 arranged on the housing, and the air outlet 307 is communicated with an air inlet (not labeled) of the motor 203, so as to achieve the purpose of pre-dedusting in the embodiment to reduce the damage risk of the motor 203, and in some other embodiments, the cyclone separation module 30 may be wholly or partially pre-installed with the housing as a whole. In summary, those skilled in the art can make various changes and modifications without departing from the scope of the present application, and therefore all equivalent technical solutions also belong to the scope of the present application, and the protection scope of the present application should be defined by the claims.

Claims

1. An electric power tool (100) comprising a housing (10) and a tool assembly assembled to the housing (10), the tool assembly comprising: a tail end output shaft (201) capable of clamping a cutter, a motor (203) directly or indirectly driving the tail end output shaft (201) through a motor shaft (L1) and a fan (205) capable of generating air flow, wherein the electric tool (100) is provided with a cyclone separation unit (30) at the upstream of the air flow of the motor (205), the cyclone separation unit (30) is provided with a cyclone shaft (L2) parallel to the motor shaft (L1) and comprises an air inlet (301), a cyclone separation cavity (303) communicated with the air inlet (301), a cyclone dust collection cavity (305) communicated with the cyclone separation cavity (303) and an air outlet (307) communicated with the cyclone separation cavity (303) and positioned at the inner periphery of the cyclone separation cavity (303), the cyclone separation unit (30) comprises a first working posture that the air shaft (L2) is horizontally positioned and forms a relative top and bottom, the cyclone separation chamber (303) is communicated with the cyclone dust collection chamber (305) through an opening (309) at the top.

2. The power tool (100) according to claim 1, wherein the cyclonic separation chamber (303) has a cylindrical or conical side wall (3031) and defines the cyclone axis (L2), and the opening (309) is provided in the side wall (3031) in a region located above the diameter 4/5 of the circular longitudinal section in the first work position.

3. The power tool (100) of claim 2, wherein the power tool (100) is an angle grinder, the cyclonic separation chamber (303) has a conical sidewall (3031), and the top opening (309) is located in the conical sidewall (3031).

4. The power tool (100) according to any one of claims 1-3, wherein the tip output shaft (201) is perpendicular to the motor shaft (L1) and parallel to a plumb direction in the first working attitude.

5. The power tool (100) according to any one of claims 1-3, wherein the cyclone dust chamber (305) surrounds the periphery of the cyclone separation chamber (303); the cyclonic separation chamber (303) communicates with the cyclonic dust collection chamber (305) through and only through the opening (309).

6. The power tool (100) according to any one of claims 1-3, wherein the cyclonic separating unit (30) is rotatable about the swivel axis (L2) to a second working position and has a top corresponding to the second working position, and the opening (309) is movably provided to the cyclonic separating unit (30) to maintain the opening (309) at the top of the second working position.

7. The power tool (100) according to claim 6, wherein the opening (309) is maintained at the top of the second working attitude by self-adjustment of gravity or manual switching of an operating portion.

8. A cyclonic separation unit (30), characterised in that: the cyclone separation unit (30) comprises an air inlet (301), a cyclone separation cavity (303) communicated with the air inlet (301) and provided with a conical side wall (3031), a cyclone dust collection cavity (305) communicated with the cyclone separation cavity (303) through an opening (309), and an air outlet (307) communicated with the cyclone separation cavity (303) and positioned on the inner periphery of the cyclone separation cavity (303), wherein the conical side wall (3031) defines a cyclone shaft (L2), the opening (309) is arranged on the side wall (3031) and limited in an area within 1/5 of a circular cross section where the opening is located, and the cyclone separation unit (30) has a first working posture that the cyclone shaft (L2) is horizontally placed and the opening (309) is placed at the top in the vertical direction.

9. Cyclonic separating unit (30) as claimed in claim 8, wherein the cyclone dust collecting chamber (305) comprises a lid (3053) movably openable for dust exhaust, the lid (3053) being pivotally connected to the open (309) side of the cyclonic separating unit (30); the cyclone separation unit (30) comprises a shell buckling part (306) formed by extending from one end far away from the cover (3053) to the direction of the opening (309).

10. Cyclonic separating unit (30) as claimed in claim 8, wherein the cyclonic separating chamber (303) communicates with the cyclonic dust chamber (305) through and only through the opening (309).