Power tool and cyclone separation unit thereof

Abstract

The present application discloses an electric tool and a cyclone separation unit thereof, the electric tool comprising a housing and a tool assembly assembled in the housing, the tool assembly comprising an end output shaft capable of clamping a tool, a motor for driving the end output shaft, and a fan, the cyclone separation unit comprising an air inlet, a cyclone separation chamber connected to the air inlet, a cyclone dust collection chamber connected to the cyclone separation chamber through an opening at the top, and an air outlet connected to the cyclone separation chamber and located on the inner periphery of the cyclone separation chamber, the cyclone separation unit defining a relative top and bottom, the top opening being disposed near the top of the cyclone separation unit. Since the cyclone dust collection chamber and the cyclone separation chamber are connected only through the opening at the top of the top, the two maintain a relatively stable isolation and dust begins to settle from the bottom due to gravity. When the machine is decelerated or stopped and restarted, the collected dust is not easily sucked back, thereby ensuring the separation effect.

Description

Technical Field

[0001] The present invention relates to a power tool, and more particularly to a power tool having a cyclonic separation assembly. Background Art

[0002] To reduce impurities in the cooling airflow passing through motors (such as those used in power tools), cyclonic separation units, which use centrifugal force to separate impurities from the air, are becoming increasingly popular. The main principle is to pass dust-laden air through a cyclonic separation chamber, where the cyclonic airflow causes large particles, such as dust, to rotate within the cyclonic separation chamber. The cyclonic separation chamber and the cyclonic dust collection chamber are connected along their entire circumference, allowing the centrifugal force to separate the particles into the dust collection chamber, thus producing purified air.

[0003] However, during the operation of the cyclone separation unit, especially during the process of starting or stopping the motor, due to the low intensity of the rotating airflow and the small centrifugal force of the particulate matter rotating in the cyclone separation chamber, the particulate matter can easily fall back after being separated into the cyclone dust collecting chamber or be sucked back into the separation chamber due to the negative pressure generated by the operation of the fan and enter the motor through the air outlet, resulting in poor air cleaning effect and the possibility of damaging the power tool.

[0004] Therefore, it is necessary to improve the technical problems existing in the prior art. Summary of the Invention

[0005] The main problem to be solved by this application is the problem of dust back-absorption in the cyclone dust collecting chamber.

[0006] In order to solve the above technical problems, on the one hand, the present application provides an electric tool, comprising a shell and a tool assembly assembled in the shell, the tool assembly comprising: an end output shaft capable of clamping a tool, a motor that directly or indirectly drives the end output shaft through a motor shaft, and a fan capable of generating an air flow, the electric tool is provided with a cyclone separation unit upstream of the air flow of the motor, the cyclone separation unit having a cyclone axis parallel to the motor shaft and comprising an air inlet, a cyclone separation chamber connected to the air inlet, a cyclone dust collecting chamber connected to the cyclone separation chamber, and an air outlet connected to the cyclone separation chamber and located at the inner periphery of the cyclone separation chamber, the cyclone separation unit comprising a first working posture in which the cyclone axis is placed horizontally and formed relative to the top and bottom, and the cyclone separation chamber is connected to the cyclone dust collecting chamber through an opening located at its top.

[0007] On the other hand, the present application also provides a cyclone separation unit, comprising an air inlet, a cyclone separation chamber connected to the air inlet and having a conical side wall, a cyclone dust collecting chamber connected to the cyclone separation chamber through an opening, and an air outlet connected to the cyclone separation chamber and located at the inner periphery of the cyclone separation chamber, the conical side wall defines a cyclone axis, the opening is arranged on the side wall and is limited to an area within 1 / 5 of the diameter of the circular cross-section thereof, and the cyclone separation unit has a first working posture in which the cyclone axis is placed horizontally and the opening is placed at the top in the vertical direction.

[0008] According to the present application, since the cyclone dust collection chamber and the cyclone separation chamber are connected only through an opening at the top, the two maintain relatively stable isolation and dust begins to settle from the bottom due to gravity. When slowing down or stopping and restarting, the collected dust is not easily sucked back, thereby ensuring the separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present application will be more fully understood by referring to the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0010] Figure 1 A schematic diagram showing the three-dimensional structure of a power tool of the present application;

[0011] Figure 2 A schematic diagram showing the exploded structure of the cyclone separation unit of the present application when not installed in a power tool;

[0012] Figure 3 show Figure 1 A schematic diagram of the cross-sectional structure of the power tool;

[0013] Figure 4 show Figure 3 Schematic diagram of the cross-sectional structure of the intermediate cyclone separation unit;

[0014] Figure 5 A schematic side view of the cover of the cyclone separation unit of the present application is shown, wherein the cover is removed. DETAILED DESCRIPTION

[0015] The specific implementation of the power tool 100 of the present application is described in detail below with reference to the accompanying drawings. For the basic working principle of the cyclone separation unit of the present application, reference can be made to the applicant's prior patent application WO2018149388A1, which will not be repeated here.

[0016] See also Figures 1 to 5As shown, the power tool 100 includes a housing 10 and a tool assembly assembled in the housing 10, the tool assembly including: an end output shaft 201 capable of clamping a tool, a motor 203 that directly or indirectly drives the end output shaft 201 through a motor shaft L1, and a fan 205 capable of generating an air flow. The power tool 100 is provided with a cyclone separation unit 30 upstream of the air flow of the motor 203. The cyclone separation unit 30 has a cyclone axis L2 parallel to the motor shaft L1 and includes an air inlet 301 (corresponding to the air inlet 301 formed during operation). Figure 4 The original air flow F1 in the middle), the cyclone separation chamber 303 connected to the air inlet 301 (corresponding to the formation of Figure 4 The cyclone airflow F2 in the cyclone dust collecting chamber 305 is connected to the cyclone separation chamber 303 through the opening 309 at the top (corresponding to the cyclone dust collecting chamber 305 when working). Figure 4 The dust collecting air flow F2 in the cyclone separation chamber 303), and the air outlet 307 connected to the cyclone separation chamber 303 and located on the inner periphery of the cyclone separation chamber 303 (corresponding to the air outlet 307 formed during operation). Figure 4 The clean airflow F4 in the cyclone separation unit 30 includes a first working posture in which the cyclone shaft L2 is placed horizontally and forms relative top and bottom (taking the angle grinder shown in the accompanying drawings as an example, the first working posture can be a posture in which the terminal output shaft 201 is perpendicular to the motor shaft L1 and parallel to the vertical direction), and the cyclone separation chamber 303 is connected to the cyclone dust collecting chamber 305 through an opening 309 located at its top. The relative top and bottom mainly reflect the height relationship of the relevant structure in the direction of gravity (vertical), that is, the bottom is located below the direction of gravity, and the top is located above the direction of gravity). Since the cyclone dust collecting chamber 305 and the cyclone separation chamber 303 are connected only through the opening 309 located at the top, the two maintain a relatively stable isolation and dust begins to settle from the bottom due to gravity. When the power tool 100 slows down or stops and restarts, particulate matter is not easily sucked back, thereby improving the separation effect. Please refer to Figure 5 The opening 309 is provided on the sidewall 3031 and, in the first operating posture, is located above 4 / 5 of the diameter d (i.e., 0.8d) of the circular longitudinal cross-section thereof. In other words, when the cyclonic separation unit 30 is not assembled into the housing 10 and does not have a power tool as a reference frame, the opening 309 is provided on the sidewall 3031 and is confined to an area within 1 / 5 of the diameter d of the circular cross-section thereof. However, the cyclonic separation unit 30 has the first operating posture with the cyclone axis L2 positioned horizontally and the opening 309 positioned at the top in the vertical direction.

[0017] The power tool 100 has a second working posture formed by rotating around the motor axis L1 (for example, an angle grinder has a grinding position in which the disc is parallel to the workpiece surface, which is the first working posture described above, and can also have a cutting position in which the disc is perpendicular to the workpiece surface, which is the second working posture described here). The top opening 309 is movably arranged on the cyclone separation unit 30 so that the top opening 309 remains close to the top of the power tool 100 in the second working posture (it is not difficult to understand that due to the change in the working posture of the power tool, the corresponding bottom and top positions also change). The cyclone separation chamber 303 has a conical sidewall 3031, and the top opening 309 is located at the small diameter end of the conical sidewall 3031. The conical sidewall defines a cyclone axis L2 parallel to the motor axis L1. The small diameter end is the rear section of the cyclone separation stroke and is also the area where dust is concentrated. The top opening 309 is located here to better guide dust collection. Of course, when the sidewall is set to a cylindrical shape, it does not affect the realization of the basic functions of this application. In summary, the cyclone separation unit 30 rotates around the cyclone axis L2 to form a second working posture and has a top corresponding to the second working posture. The opening 309 is movably provided on the cyclone separation unit 30 so that the opening 309 remains at the top of the second working posture.

[0018] Specifically, the opening 309 at the top can be maintained at the top of the second working posture by self-adjustment of gravity or manual switching of the operating part. The electric tool described in this embodiment is an angle grinder, and the terminal output shaft 201 is perpendicular to the motor shaft L1. It is not difficult to see from this that the different operating modes of the angle grinder are mainly formed by rotating around the motor shaft L1, and its specific internal structure ensures that the overall shape and position of the cyclone separation unit 30 during operation will not change due to different operating modes, and has good adaptability. The cyclone dust collecting chamber 305 surrounds the outer periphery of the cyclone separation chamber 303 to make better use of the space of the cyclone separation unit 30. The cyclone dust collecting chamber 305 also includes a cover 3053 that can be movably opened to discharge dust. The cover 3053 is pivotally connected to the side of the opening 309 of the cyclone separation unit 30, that is, the top of the cyclone separation unit 30, to discharge accumulated dust in a timely manner. The cyclone separation unit 30 further includes a housing snap-fit ​​portion 306 extending from an end away from the cover 3053 toward the opening 309 , so that the structure can be snap-fitted to the housing 10 by a thumb and index finger of a person.

[0019] The above specific embodiments are only used to illustrate the present application, and are not intended to limit the present application. For example, the above specific embodiments mainly introduce the application of the present application on an angle grinder. In fact, the cyclone separation unit can be used as a cyclone separation component in electric hammers, circular saws, electric drills, cutting machines and even in the field of non-electric tools. Furthermore, the cyclone separation component of this embodiment is mainly used for pre-treatment of cooling air before it enters the motor. In other cases, the pre-treatment of contaminated air before it is discharged to the outside can also be applied to the cyclone separation component, as long as the air is purified. In addition, the cyclone separation unit in the above embodiment is an independent functional module that is detachable from the shell, and the power tool 100 is provided with a module receiving space 101 at the bottom of the shell 10, and the cyclone separation module 30 is loaded into the module receiving space 101 from the bottom of the power tool. After the cyclone separation module 30 is installed, the air inlet 301 is connected to the several air inlet grilles 103 opened on the shell, and the air outlet 307 is connected to the air inlet (not marked) of the motor 203, thereby achieving the purpose of pre-dust removal in this embodiment to reduce the risk of damage to the motor 203. In some other embodiments, the cyclone separation module 30 can also be pre-installed in whole or in part with the shell. In summary, ordinary technicians in the relevant technical field can make various changes and modifications without departing from the scope of this application. Therefore, all equivalent technical solutions also fall within the scope of this application, and the scope of patent protection of this application should be defined by the claims.

Claims

1. An electric tool (100), characterized in that: The invention comprises a housing (10) and a tool assembly assembled on the housing (10), wherein the tool assembly comprises: an end output shaft (201) capable of clamping a tool, a motor (203) directly or indirectly driving the end output shaft (201) via a motor shaft (L1), and a fan (205) capable of generating an air flow, wherein the electric tool (100) is provided with a cyclone separation unit (30) upstream of the air flow of the motor (203), the cyclone separation unit (30) having a cyclone axis (L2) parallel to the motor shaft (L1) and comprising an air inlet (301), a cyclone separation fan (205) connected to the air inlet (301), and a fan (205) configured to generate an air flow. The cyclone separation unit (300) comprises a cyclone dust collecting chamber (305) connected to the cyclone separation chamber (303), and an air outlet (307) connected to the cyclone separation chamber (303) and located on the inner periphery of the cyclone separation chamber (303). The cyclone separation unit (300) comprises a first working posture in which the cyclone axis (L2) is placed horizontally and forms a relative top and bottom. The cyclone separation chamber (303) is connected to the cyclone dust collecting chamber (305) through an opening (309) located at the top thereof, and the cyclone separation chamber (303) is connected to the cyclone dust collecting chamber (305) through and only through the opening (309).

2. The electric tool (100) according to claim 1, characterized in that The cyclone separation chamber (303) has a cylindrical or conical side wall (3031) and defines the cyclone axis (L2); the opening (309) is provided on the side wall (3031) and is located in an area above 4 / 5 of the diameter of the circular longitudinal section thereof in the first working posture.

3. The electric tool (100) according to claim 2, characterized in that The electric tool (100) is an angle grinder, the cyclone separation chamber (303) has a conical cylindrical side wall (3031), and the top opening (309) is located on the conical cylindrical side wall (3031).

4. The electric tool (100) according to any one of claims 1-3, characterized in that The terminal output shaft (201) is perpendicular to the motor shaft (L1) and parallel to the vertical direction in the first working posture.

5. The electric tool (100) according to any one of claims 1 to 3, characterized in that: The cyclone dust collecting chamber (305) surrounds the outer periphery of the cyclone separation chamber (303).

6. The electric tool (100) according to any one of claims 1-3, characterized in that The cyclone separation unit (30) rotates around the cyclone axis (L2) to form a second working posture and has a top corresponding to the second working posture, and the opening (309) is movably provided on the cyclone separation unit (30) so that the opening (309) remains at the top of the second working posture.

7. The electric tool (100) according to claim 6, characterized in that The opening (309) is maintained at the top of the second working posture by self-adjustment of gravity or manual switching of the operating part.

8. A cyclone separation unit (30), characterized in that: The cyclone separation unit (30) comprises an air inlet (301), a cyclone separation chamber (303) communicating with the air inlet (301) and having a conical cylindrical side wall (3031), a cyclone dust collection chamber (305) communicating with the cyclone separation chamber (303) through an opening (309), and an air outlet (307) communicating with the cyclone separation chamber (303) and located on the inner periphery of the cyclone separation chamber (303), wherein the conical cylindrical side wall (3031) is provided. 1) A cyclone axis (L2) is defined, the opening (309) is provided on the side wall (3031) and is limited to an area within 1 / 5 of the diameter of the circular cross section in which the cyclone axis (L2) is located, the cyclone separation unit (30) has a first working posture in which the cyclone axis (L2) is placed horizontally and the opening (309) is placed at the top in a vertical direction, and the cyclone separation chamber (303) is connected to the cyclone dust collecting chamber (305) through and only through the opening (309).

9. The cyclone separation unit (30) according to claim 8, characterized in that The cyclone dust collecting chamber (305) comprises a cover (3053) that can be movably opened to discharge dust, and the cover (3053) is pivotally connected to the opening (309) side of the cyclone separation unit (30); the cyclone separation unit (30) comprises a shell buckle portion (306) extending from an end away from the cover (3053) toward the opening (309).

10. The cyclone separation unit (30) according to claim 8, characterized in that The cyclone dust collecting chamber (305) surrounds the outer periphery of the cyclone separation chamber (303).

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