CN-118024098-B - Air duct system and electric tool

Abstract

The invention relates to an air duct system, which comprises a shell, a motor component and an air duct mechanism, wherein the motor component is accommodated in the shell, the air duct mechanism is used for cooling the motor component, the motor component is provided with a stator fixed on the shell and a rotor penetrating through the stator, the air duct mechanism is provided with a driving fan arranged on the rotor, the driving fan is driven to rotate to generate cooling gas, the air duct mechanism comprises a guide piece driven to rotate by the cooling gas, a first air duct formed between the stator and the shell and a second air duct independent of the first air duct, and the second air duct is at least partially positioned at the downstream of the guide piece.

Inventors

• LIU AIGUO
• WU YONG
• YANG JINHUI

Assignees

• 江苏东成机电科技有限公司

Dates

Publication Date

20260508

Application Date

20240223

Claims (8)

1. 1. An air duct system comprises a shell and an air duct mechanism for cooling a motor assembly accommodated in the shell, wherein the motor assembly is provided with a stator fixed on the shell and a rotor penetrating through the stator, and the air duct mechanism is provided with a driving fan arranged on the rotor, and the driving fan rotates to generate cooling gas; the cooling air flow guiding device is characterized by comprising a flow guiding piece driven by the cooling air to rotate, a first air channel formed between the stator and the shell and a second air channel independent of the first air channel, wherein the second air channel is at least partially positioned at the downstream of the flow guiding piece; the cooling gas flows through the first air duct and the second air duct, dust carried in the cooling gas is guided into the first air duct by the guide piece, the shell is provided with a grid for supporting the rotor, the grid is connected between the retaining ring and the grid outer ring, the guide piece and the grid are arranged around to form the second air duct, the second air duct comprises a labyrinth channel and a grid air window, the grid air window is communicated with the labyrinth channel, the grid air window extends along the axial direction of the grid, the grid comprises a grid inner ring and a grid outer ring connected with the grid inner ring, the grid air window is positioned between the grid inner ring and the grid outer ring, the guide piece is provided with a retaining ring for covering at least part of the grid outer ring, the labyrinth channel is positioned between the retaining ring and the grid outer ring, the guide piece is provided with a first blade which extends in an arc shape and is deviated from the axial direction, the first blade is a forced end for driving the guide piece to rotate along the axial direction, the second blade is a force application end of the flow guide piece for throwing the dust.
2. 2. The air duct system of claim 1, wherein the rotor is supported to the grille by a second bearing, and the first air duct is formed between an outer wall of the grille, an outer wall of the stator, and an inner wall of the housing.
3. 3. The duct system of claim 2, wherein the deflector comprises a hub, an annular ramp extending from the hub, the retainer ring being coupled to the annular ramp, the labyrinth passage being an inlet section of the second duct.
4. 4. The wind tunnel system according to claim 3, wherein the guide member is provided with a combination blade on a surface of the circular slope, the combination blade including the first blade and the second blade, the first blade being connected to a root portion of the circular slope, and a surface area of the first blade being larger than a surface area of the second blade.
5. 5. The wind tunnel system of claim 1 wherein a center of rotation of the deflector coincides with a center of rotation of the rotor.
6. 6. The wind tunnel system according to claim 1, wherein the stator has a stator core, an end plate abutting against an end surface of the stator core, and a cover plate abutting against an end surface of the end plate, the grill outer ring abuts against an end surface of the cover plate, the end plate is formed with an end plate gap, the cover plate has a cover plate louver, and the grill louver, the cover plate louver, and the end plate gap are communicated.
7. 7. The electric tool comprises a shell, a motor assembly, a control assembly and an air duct mechanism, wherein the motor assembly is accommodated in the shell, the control assembly drives the motor assembly, the air duct mechanism cools the motor assembly and the control assembly, and the shell and the air duct mechanism form an air duct system, and the electric tool is characterized in that the air duct system is the air duct system according to any one of claims 1-6, the control assembly is provided with a packaging box connected to the shell, and the flow guide piece is installed on the end face of the packaging box, which faces the motor assembly.
8. 8. The power tool of claim 7, wherein the power tool is an angle grinder.

Description

Air duct system and electric tool [ Technical field ] The invention relates to the technical field of electric tools, in particular to an air duct system and an electric tool using the air duct system. [ Background Art ] The electric tool is a tool in which an output end accessory is driven by a motor to operate so as to work a workpiece, and during the processing of the electric tool, a control assembly and a motor assembly generate a large amount of heat, and the heat can be taken away by cooling air flow generated by driving a fan to rotate and discharged from the interior of the machine. However, the cooling air flow brings in dust generated by tool operation together when entering the machine, and in the grinding tool with the permanent magnet rotor, when cooling air carrying dust flows through the motor, the dust can be absorbed by the rotor, the efficiency of the motor is affected, and even the motor is disabled, besides, the dust can also impact the stator coil, the risk of stabbing the coil exists, and further the coil is short-circuited and/or broken. At present, the method for preventing dust from entering the motor in the electric tool is to add a dust screen at the air inlet, the dust screen has a certain blocking effect on larger dust, however, the blocking effect of the dust screen on dust smaller than meshes is poor, and the smaller dust still enters the motor to cause damage to the motor. In view of the foregoing, it is determined that a new air duct system and an electric tool using the air duct system are needed to overcome the drawbacks of the prior art. [ Summary of the invention ] Aiming at the defects of the prior art, the invention aims to provide an air duct system and an electric tool using the air duct system, and the air duct system can enable the electric tool to have excellent heat dissipation performance and dustproof performance. The invention solves the problems in the prior art by adopting the following technical scheme that the air duct system comprises a shell, a motor assembly and an air duct mechanism, wherein the motor assembly is accommodated in the shell, the air duct mechanism is used for cooling the motor assembly, the motor assembly is provided with a stator fixed on the shell and a rotor penetrating through the stator, the air duct mechanism is provided with a driving fan arranged on the rotor, the driving fan rotates to generate cooling gas, the air duct mechanism comprises a flow guide piece driven to rotate by the cooling gas, a first air duct formed between the stator and the shell and a second air duct independent of the first air duct, and the second air duct is at least partially positioned at the downstream of the flow guide piece. The further improvement scheme is that the cooling gas flows through the first air duct and the second air duct, and dust carried in the cooling gas is guided into the first air duct by the guide piece. The casing is provided with a grid connected to the inner wall, the rotor is supported on the grid through a second bearing, the first air duct is formed among the outer wall of the grid, the outer wall of the stator and the inner wall of the casing, and the second air duct is formed among the guide piece and the grid. The guide piece comprises a hub, an annular slope extending from the hub and a retainer ring connected to the annular slope, the grille is provided with a grille inner ring, a grille outer ring connected to the grille inner ring and a grille air window arranged between the grille inner ring and the grille outer ring, the retainer ring and the grille outer ring form a labyrinth channel, the labyrinth channel is an inlet section of a second air channel, and the grille air window is communicated with the labyrinth channel. The guide piece is provided with a combined blade on the surface of the annular slope, the combined blade is provided with a root connected with the annular slope, a first blade which deviates from the axial direction from the root and extends in a bending mode and a second blade which extends along the axial direction, and the surface area of the first blade is larger than that of the second blade. The further improved scheme is that the first blade is a force bearing end for driving the flow guiding piece to rotate by the cooling gas, and the second blade is a force application end for throwing the dust by the flow guiding piece. The further improvement is that the rotation center of the flow guiding piece coincides with the rotation center of the rotor. The stator is provided with a stator core, an end plate abutting against the end face of the stator core and a cover plate abutting against the end face of the end plate, the outer ring of the grille abuts against the end face of the cover plate, an end plate gap is formed in the end plate, a cover plate air window is arranged on the cover plate, and the grille air window, the cover plate air window and the end plate gap are communicated. The inv