CN209954616U

CN209954616U - Electric tool with detachable cyclone pre-dust-removing unit

Info

Publication number: CN209954616U
Application number: CN201822227010.5U
Authority: CN
Inventors: 李扬宝
Original assignee: Bosch Power Tools China Co Ltd
Current assignee: Bosch Power Tools China Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2020-01-17
Anticipated expiration: 2028-12-28

Abstract

The utility model provides an electric tool with can dismantle whirlwind unit of removing dust in advance, includes housing assembly and whirlwind unit of removing dust in advance, housing assembly is including assembling in half first casing and the second of an organic whole half casing, the whirlwind unit of removing dust in advance can be in and demolish from electric tool under the condition of half first casing and the second half casing of not disassembling for the whirlwind unit of removing dust in advance maintenance work operations such as cleaning, change are convenient, efficiency has been improved.

Description

Electric tool with detachable cyclone pre-dust-removing unit

Technical Field

The application relates to an electric tool, in particular to the field of air dust removal of electric tools.

Background

In the working process of the electric tool, the motor of the electric tool needs to be cooled by cooling airflow. To reduce the level of particulate matter in the cooling air stream and to avoid damage to the motor by particulate matter in the air stream, a cyclonic pre-dust removal unit of the power tool is used to separate the particulate matter from the cooling air stream. The cyclone pre-dust removal unit is assembled inside the shell of the electric tool as a part of the electric tool, when certain particulate matters accumulated in the cyclone pre-dust removal unit need to be thoroughly cleaned or the cyclone pre-dust removal unit fails and needs to be replaced and repaired, the cyclone pre-dust removal unit can be taken out only after the shell of the electric tool is disassembled, so that the cleaning and/or maintenance operation of the cyclone pre-dust removal unit is complex, and the maintenance service cost is high.

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

SUMMERY OF THE UTILITY MODEL

What this application will be solved is the convenience problem that cleans and maintains whirlwind dust removal unit in advance to electric tool.

In order to solve the technical problem, the application provides an electric tool, including casing subassembly and whirlwind unit of removing dust in advance, the casing subassembly is including assembling in half first casing and the second casing of an organic whole, the whirlwind unit of removing dust in advance can be in not disassembling follow under the half first casing and the half second casing the electric tool is packed into and is demolishd for whirlwind unit of removing dust in advance's maintenance work operations such as cleaning, change are convenient, efficiency has been improved.

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 view of a portion of a power tool of the present application;

FIG. 2 is a schematic cross-sectional view of a power tool of the present application;

FIG. 3 is a schematic view of a cantilever structure of a cyclone pre-dust removal unit of an electric tool according to the present application;

FIG. 4 shows a schematic view of a cyclone pre-dust removal unit installation of an electric tool of the present application;

FIG. 5 is a schematic view of a cyclone pre-dust removal unit of another power tool of the present application;

fig. 6 shows a schematic structural diagram of a cyclone pre-dust removal unit of an electric tool of the present application.

Detailed Description

The following describes in detail an embodiment of the power tool 100 according to the present application with reference to the drawings. Referring to fig. 1, the electric tool 100 of the present embodiment is an angle grinder, and the electric tool 100 includes a housing assembly 10 and a cyclone pre-dust removing unit 20, wherein the housing assembly 10 includes a first housing half 101 and a second housing half 102 (not shown) assembled together, the housing assembly 10 has at least one opening 103, and the inner side walls of the first housing half 101 and the second housing half 102 (not shown) have a reinforcing structure 104, such as a honeycomb or rib, at a position corresponding to the cyclone pre-dust removing unit 20. The cyclone pre-dust removal unit 20 can be detached from the electric tool 100 through the opening 103 without disassembling the first half shell 101 and the second half shell 102, so that the maintenance work operations such as cleaning and replacement of the cyclone pre-dust removal unit are convenient, and the efficiency is improved; the reinforcing structure 104 provides the power tool 100 with greater strength for housing the housing assembly 10 of the cyclonic pre-dust extraction unit 20 to meet the operational requirements of the power tool 100 under vibration conditions.

Referring to fig. 1 and 2, in particular, the housing assembly 10 of the power tool 100 according to the present application further includes an integrally formed front housing 105, wherein the front housing 105 and a rear housing composed of a first housing half 101 and a second housing half 102 (not shown) together form a housing body of the power tool 100; the electric tool 100 further comprises a motor 30, the motor 30 comprises a stator 301 and a rotor shaft assembly 302, an air passage G for air to pass through is formed between the stator 301 and the rotor 302 of the motor 30, the rotor shaft assembly 302 further comprises a fan 40 capable of generating air flow, the air flow passes through the motor 30 through the air passage G, the fan 40 is arranged at the downstream of the motor 30 in the air flow direction F, and the motor 30 is arranged at the downstream of the cyclone pre-dust removal unit 20; the cyclone pre-dust-removing unit 20 comprises a first end wall 201, a second end wall 202 and an outer side wall 203 connecting the first end wall 201 and the second end wall 202, the first end wall 201, the second end wall 202 and the outer side wall 203 enclose a cyclone pre-dust-removing cavity 20a, the first end wall 201 is provided with an air outlet 201a, the outer side wall 203 is provided with an air inlet 203a, the air inlet 203a is communicated with the cyclone pre-dust-removing cavity 20a, the cyclone pre-dust-removing cavity 20a is communicated with the air outlet 201a, the motor 30 is located at the downstream of the air outlet 201a in the airflow direction F, the first end wall 201 faces an inner cavity formed by the shell assembly 10 of the electric tool 100, so that the air outlet 201a of the cyclone pre-dust-removing unit 20 is communicated with the air passage G, the passage of the airflow in the electric tool 100 is ensured, and after particulate matters in the airflow are separated by the cyclone pre-dust-removing, The clean airflow is allowed to flow toward the motor 30 to cool the motor 30.

The cyclone pre-dust removing unit 20 is combined with a rear housing composed of a first half housing 101 and a second half housing 102 (not shown) by a fixing structure, such as a snap structure. In the structural view of the cyclone pre-dust removing unit of one embodiment of the present application as shown in fig. 3, the cyclone pre-dust removing unit 20 has a first cantilever 21 and a second cantilever 22; one end of the first cantilever 21 is fixed on the outer side wall 203 of the cyclone pre-dust-removing unit 20, the other end of the first cantilever 21 is a free end, and the first buckle 211 is arranged at the free end of the first cantilever 21; one end of the second cantilever 22 is fixed on the outer sidewall 203 of the cyclone pre-dust removal unit 20, the other end of the second cantilever 22 is a free end, and the second buckle 221 is arranged at the free end of the second cantilever 22, in the present embodiment, the two cantilevers are respectively fixed at the bottom of the cyclone pre-dust removal unit 20 and extend upward from the bottom of the cyclone pre-dust removal unit 20 to form respective corresponding free ends; correspondingly, a first clamping groove 1011 (not shown) matched with the first clamping buckle 211 is arranged at a position, corresponding to the first clamping buckle 211, on the inner side wall of the first half shell 101, a second clamping groove 1021 (not shown) matched with the second clamping buckle 221 is arranged at a position, corresponding to the second clamping buckle 221, on the inner side wall of the second half shell 102 (not shown), the first clamping buckle 211 is clamped into the first clamping groove 1011, and the second clamping buckle 221 is clamped into the second clamping groove 1021, so that the cyclone pre-dust-removing unit 20 is assembled in the rear shell of the electric tool 100. The cantilever structure has certain elasticity, so that an operator can conveniently press the cantilever by fingers to install or remove the cyclone pre-dust removal unit 20, and the two cantilevers respectively extend upwards from the bottom of the cyclone pre-dust removal unit 20, so that the two cantilevers are opposite to the positions of the thumb and the middle finger which are conveniently pressed when the operator holds the two cantilevers in the installation or removal process of the cyclone pre-dust removal unit 20, the angle of the cyclone pre-dust removal unit 20 does not need to be adjusted in the operation process, the direct operation can be realized without adjusting the finger pressing direction of the operator, the operation steps are reduced, and the operation efficiency is improved; meanwhile, the cantilever structure provides a larger space for arranging the buckle structure, the size of the buckle is prevented from being excessively limited by the size of the cyclone pre-dust-removing unit 20 body to influence the strength of the buckle, and the cyclone pre-dust-removing unit 20 is more firmly assembled in the shell of the electric tool 100.

Further, with continued reference to fig. 1 to 4, the first half-shell 101 and the second half-shell 102 (not shown) are half-shells and are substantially symmetrical with respect to an assembly plane of the first half-shell 101 and the second half-shell 102 (not shown), and the first card slot 1011 and the second card slot 1021 (not shown) are substantially symmetrical on both sides of the assembly plane; accordingly, the first and

second cantilevers

21 and 22 of the cyclone pre-dust removing unit 20 assembled in the rear housing of the power tool 100 are also substantially symmetrical on both sides of the assembly plane. The symmetrical shell structure, the cyclone pre-dedusting unit structure, the buckle and the clamping groove structure enable alignment in the installation process to be more convenient and accurate, and the symmetrical structural design also improves the production and manufacturing efficiency of the component and the die thereof. Furthermore, the central axis of the rotor shaft of the motor 30 of the power tool 100 is approximately located in the assembly plane of the first half shell 101 and the second half shell 102, the cyclone pre-dust removal unit 20 is designed to be cylindrical as a whole, and the central axis of the rotor shaft of the motor 30 is approximately coincident with the central axis of the cyclone pre-dust removal unit 20, so that the coaxially designed power tool is more compact in structure, the air flow path in the power tool 100 is shortest, and the working efficiency is improved. With continued reference to fig. 4, the central axis of the cylindrical cyclone pre-dust-removing chamber 20a may also be arranged substantially perpendicular to the central axis of the rotor shaft of the motor 30, the air outlet of the cyclone pre-dust-removing chamber 20a faces the inner cavity of the power tool 100, and in the normal working state of the power tool, the central axis of the rotor shaft is substantially in the horizontal position, and accordingly, the axis of the cyclone pre-dust-removing chamber 20a is substantially in the vertical position and the air outlet of the cyclone pre-dust-removing chamber 20a faces the direction opposite to the gravity direction. In other words, the angle grinder of the present embodiment has a terminal output shaft to which an accessory (not shown) can be coupled, the central axis of the cyclone pre-dust removing chamber 20a is substantially parallel to the terminal output shaft of the angle grinder, and the cyclone pre-dust removing unit 20 and the accessory are located on the same side of the rotor shaft of the motor 30. Therefore, the particles separated during the operation of the cyclone pre-dust removing unit 20 are more likely to be deposited on the bottom of the cyclone pre-dust removing chamber 20a under the action of gravity, and the probability that the particles are carried to the motor 30 by the airflow is further reduced.

Besides the snap structure, the fixing structure between the cyclone pre-dust removing unit 20 and the rear housing may be a screw thread. Referring to fig. 4, the surface of the outer sidewall 203 of the cyclone pre-dust removing unit 20 has a first thread 2031, and a position on the inner sidewall of the rear housing corresponding to the cyclone pre-dust removing unit 20 has a second thread 1032 (not shown) matching with the first thread 2031, and the cyclone pre-dust removing unit 20 is assembled in the rear housing by screwing the threads, and because the distribution area of the threads is large, in the process that the cyclone pre-dust removing unit 20 corresponds to the opening 103, the position of a single fixed structure does not need to be paid special attention, and the assembly can be quickly screwed only by matching the threads in place, and similarly, in the process of dismantling, the threads need to be directly unscrewed, so that the operation of installation is simpler and more convenient.

Referring to fig. 5, in the case that the first half shell 101 and the second half shell 102 are half-shell and are approximately symmetrical at two sides of the assembly plane of the first half shell 101 and the second half shell 102, two

openings

103a and 103b are symmetrically formed on the first half shell 101 and the second half shell 102, respectively, each opening can be assembled with a cyclone pre-dust removal unit (20, 20 ') (e.g., by a screw structure), and when the two cyclone pre-dust removal units (20, 20') work simultaneously, the air inlet passage of the air flow can be increased and the dust removal efficiency can be improved; or when one cyclone pre-dust removal unit (20 or 20 ') cannot work due to faults and the like, the other cyclone pre-dust removal unit (20' or 20) can continue to work as a spare part, so that the work of the whole electric tool 100 is prevented from being influenced; alternatively, the operator of the power tool 10 may choose to turn on a cyclone pre-cleaner unit (20 or 20') that is located remotely from the operator, depending on his operating habits, so that the operator is as far away from the dirty airflow as possible during use of the power tool 100. After the assembly, the second end wall of the cyclone pre-dust removal unit forms a part of the appearance surface of the electric tool, so that the cyclone pre-dust removal unit has a visual effect of an integrated structure.

As shown in fig. 6, the second end wall 202 of the cyclone pre-dust removing unit 20 is openably and closably assembled on the outer side wall 203 thereof, for example, the second end wall 202 is assembled on the outer side wall 203 by a pivot structure 205, or the second end wall 202 is assembled on the outer side wall 203 by a snap structure, so that the interior of the cyclone pre-dust removing unit 20 can be cleaned more thoroughly by opening the second end wall 202 when the cyclone pre-dust removing unit 20 is detached from the electric power tool 100.

The common forms such as whirlwind formula pre-dedusting unit in electric tool field at present all can adopt the assembly mode detachably of this application to assemble in electric tool's casing. As shown in fig. 2, the cyclone-type cyclone pre-dust removing unit 20 also includes an air inlet 203a, a cyclone pre-dust removing chamber 20a communicated with the air inlet 203a, and an air outlet 201a communicated with the cyclone pre-dust removing chamber 20a, the cyclone pre-dust removing chamber 20a further includes a cyclone separation chamber 20aa, a cyclone dust collecting chamber 20ab communicated with the cyclone separation chamber 20aa and located at the outer periphery of the cyclone separation chamber 20aa, and the air outlet 201a is located at the inner periphery of the cyclone separation chamber 20 aa. In operation, the fan 40 sucks air and enters the cyclone separation cavity 20aa from the air inlet 203a of the cyclone pre-dust-removal unit 20 to form cyclone, large-mass particulate matters such as dust in the air are driven by cyclone airflow to rotate in the cyclone separation cavity 20aa, the particulate matters are separated into the cyclone dust-collection cavity 20ab under the action of centrifugal force, and clean air with the separated particulate matters is sent to the motor 30 to cool the motor through the air outlet 201a of the cyclone pre-dust-removal unit 20. In the case of the cyclone-type cyclone pre-dust-removing unit 20, since the structure of the inner cavity of the cyclone pre-dust-removing unit is more complex, the cyclone pre-dust-removing unit 20 needs to be disassembled from the electric tool 100 for thorough cleaning, and the detachable assembly structure between the cyclone pre-dust-removing unit 20 and the housing of the electric tool 100 is also more suitable for the case of the cyclone-type cyclone pre-dust-removing unit.

The above detailed description is merely illustrative of the present application and is not intended to be limiting. The above embodiments have mainly described the application of the present application to an angle grinder, and indeed, the cyclone separation unit may be used as an air pre-cleaning assembly in electric hammers, circular saws, electric drills, cutting machines and even in non-electric tools for a wider range of applications.

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) with a detachable cyclonic pre-dust removal unit, the electric power tool (100) comprising a housing assembly (10) assembled with a motor (30) and a cyclonic pre-dust removal unit (20) located upstream of the motor (30), the housing assembly (10) comprising a first half-housing (101) and a second half-housing (102) assembled in one piece, characterized in that the cyclonic pre-dust removal unit (20) is insertable into and removable from the electric power tool (100) without disassembling the first half-housing (101) and the second half-housing (102).

2. The power tool (100) according to claim 1, wherein the housing assembly has at least one opening (103) thereon, the cyclone pre-dust removal unit (20) is detachably assembled to the power tool (100) through the opening (103), and the inner side wall of the housing assembly has a honeycomb-shaped or rib-shaped reinforcing structure (104) at a position corresponding to the cyclone pre-dust removal unit (20).

3. The power tool (100) of claim 2,

the first half shell (101) and the second half shell (102) are assembled to form a rear shell, the shell assembly (10) further comprises a front shell (105) which is integrally formed, the motor (30) is arranged on the front shell (105), and the opening part (103) is arranged on the rear shell.

4. The power tool (100) according to claim 3,

the motor (30) comprises a stator (301) and a rotor shaft assembly (302), an air passage (G) for air to pass through is formed between the stator (301) of the motor (30) and a rotor of the rotor shaft assembly (302), the rotor shaft assembly (302) further comprises a fan (40) capable of generating air flow, the air flow passes through the motor (30) through the air passage (G), in the air flow direction (F), the fan (40) is located at the downstream of the motor (30), and the motor (30) is located at the downstream of the cyclone pre-dust-removing unit (20);

the cyclone pre-dust-removing unit (20) is provided with an air inlet (203a) communicated with outside air, an air outlet (201a) communicated with the air passage (G) and a cyclone pre-dust-removing cavity (20a) communicated with the air inlet (203a) and the air outlet (201 a).

5. The power tool (100) according to claim 4, wherein the cyclone pre-dust removal unit (20) has at least one first fixing structure on an outer side wall (203), a second fixing structure matched with the first fixing structure is arranged on a position corresponding to the first fixing structure on an inner side wall of the rear housing, and the cyclone pre-dust removal unit (20) is assembled to the housing assembly (10) through the first fixing structure and the second fixing structure.

6. The power tool (100) according to claim 4, wherein the first half housing (101) has a first engaging groove (1011) on its inside wall, the second half housing (102) has a second engaging groove (1021) on its inside wall, the cyclone pre-dust collecting unit (20) has a first cantilever (21) and a second cantilever (22), the free end of the first cantilever (21) has a first engaging catch (211) engaging with the first engaging groove (1011), and the free end of the second cantilever (22) has a second engaging catch (221) engaging with the second engaging groove (1021).

7. The power tool (100) according to claim 6, wherein the first and second card slots (1011, 1021) are substantially symmetrical with respect to an assembly plane of the first and second half-housings (101, 102), and the first and second cantilever arms (21, 22) of the cyclone dust pre-collecting unit (20) assembled in a rear housing of the power tool (100) are substantially symmetrical with respect to the assembly plane.

8. The power tool (100) according to claim 7, wherein the first and second cantilevers (21, 22) extend upward from a bottom of the cyclone pre-dust removing unit (20), and a pressing portion is provided outside free ends of the first and second cantilevers (21, 22).

9. The power tool (100) of claim 5, wherein the first securing structure is a snap or catch and the second securing structure is a mating catch or catch; or, the first fixing structure is a first thread (2031), the first thread (2031) is distributed on the surface of the outer side wall (203) of the cyclone pre-dust removal unit (20), the second fixing structure is a second thread (1032), the second thread (1032) is distributed on the inner side wall of the rear shell corresponding to the position of the cyclone pre-dust removal unit (20) and matched with the first thread (2031), and the cyclone pre-dust removal unit (20) is assembled in the rear shell through a thread structure.

10. The power tool (100) according to claim 4, wherein the first half-housing (101) and the second half-housing (102) are half-housings and are substantially symmetrical with respect to an assembly plane of the first half-housing (101) and the second half-housing (102), the rear housing has two opening portions substantially symmetrical with respect to the assembly plane, and the power tool (100) includes two cyclone pre-dust removing units, one of which is assembled at each of the opening portions.

11. The power tool (100) according to claim 4, wherein the cyclonic pre-dusting chamber (20a) is cylindrical and has a central axis substantially coinciding with a rotor axis of the motor (30).

12. The power tool (100) according to claim 4, wherein the power tool (100) is an angle grinder and has a terminal output shaft to which an accessory can be coupled, the cyclone pre-dust removing chamber (20a) is cylindrical, a central axis of the cyclone pre-dust removing chamber (20a) is substantially parallel to the terminal output shaft of the angle grinder, and the cyclone pre-dust removing unit (20) and the accessory are located on the same side of a rotor shaft of the motor (30).

13. The electric tool (100) according to claim 4, wherein the cyclone pre-dust-removing cavity (20a) of the cyclone pre-dust-removing unit (20) is defined by a first end wall (201) and a second end wall (202) which are oppositely arranged, and an outer side wall (203) connecting the first end wall (201) and the second end wall (202), the air outlet (201a) is arranged on the first end wall (201), a plurality of air inlets (203a) are arranged on the outer side wall (203) along the circumferential direction of the cyclone pre-dust-removing cavity (20a), and the second end wall (202) is arranged on the outer side wall (203) of the cyclone pre-dust-removing unit (20) in an openable and closable manner.