CN111835123A

CN111835123A - Motor and electric tool

Info

Publication number: CN111835123A
Application number: CN201910309630.XA
Authority: CN
Inventors: 吹拔正敏; 赵祥; 倪沐阳
Original assignee: Nanjing Deshuo Industrial Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd; Nanjing Deshuo Industrial Co Ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2020-10-27

Abstract

The invention discloses a motor and an electric tool, and belongs to the technical field of electric tools. The motor provided by the invention comprises a stator, a rotor and a dustproof assembly, wherein an airflow channel is arranged between the stator and the rotor, two ends of the airflow channel are respectively covered with the dustproof assembly, the dustproof assembly comprises a support frame and a filter screen, the support frame is fixedly arranged on the rotor, and the filter screen covers the air vent on the support frame. Through respectively setting up a dustproof subassembly at airflow channel's both ends, can carry out the omnidirectional dustproof to the motor, avoid the foreign matter to get into between stator and the rotor from airflow channel's both ends, be favorable to improving dustproof effect. And the filter screen is fixed on the rotor by utilizing the support frame, so that the synchronous rotation of the filter screen and the rotor can be realized, the purpose of throwing away the foreign matters accumulated on the filter screen is achieved, the self-cleaning of the filter screen is favorably realized, and the foreign matters accumulated on the filter screen are prevented from blocking the inlet and the outlet of the air flow channel.

Description

Motor and electric tool

Technical Field

The invention relates to the technical field of electric tools, in particular to a motor and an electric tool.

Background

An angle grinder, also called a grinder or a disc grinder, is a power tool for cutting and grinding. The angle grinder comprises a grinding mechanism and a motor, wherein the motor is in transmission connection with the grinding mechanism and can provide power for the grinding mechanism to execute grinding operation or cutting operation. The motor that is used for angle mill at present does not generally set up dustproof subassembly or only sets up dustproof subassembly in the one end that motor and grinding machanism are connected to inside dust and the piece that produces in avoiding the angle mill working process gets into the motor, thereby produce the influence to the normal operation of motor.

But because the stator and the rotor of motor have magnetism, can produce iron fillings when angle mill cutting or grinding ironwork, under stator and rotor magnetic attraction, iron fillings can be kept away from between grinding machanism's one end entering stator and the rotor from the motor, and iron fillings are piled up for a long time and still can be got rid of the appearance that still can cause the motor failure condition between stator and rotor.

Disclosure of Invention

The invention aims to provide a motor which is good in dustproof effect and long in service life.

A second object of the present invention is to provide an electric power tool which is less likely to fail, has a long service life, and is highly safe.

In order to achieve the purpose, the invention adopts the following technical scheme:

an electric machine comprises a rotor and a stator,

an airflow channel is arranged between the stator and the rotor, and two dustproof assemblies are respectively arranged at two ends of the airflow channel in a covering mode;

each dustproof component all includes support frame and filter screen, the support frame is fixed to be set up on the rotor, and can with the rotor rotates in step, be provided with on the support frame with the bleeder vent of airflow channel intercommunication, the filter screen lid is established on the bleeder vent.

Preferably, the filter net is disposed obliquely with respect to the rotation axis b of the rotor.

Preferably, the sieve surface of the sieve is inclined at an angle a of 30-60 ° relative to the axis of rotation b of the rotor.

Preferably, the two filter screens are inclined in opposite directions relative to the rotor, and the distance between the two filter screens gradually increases from outside to inside along the radial direction of the rotor.

Preferably, the support frame comprises an inner ring piece and an outer ring piece, the inner ring piece is sleeved in the outer ring piece, a plurality of connecting pieces are arranged between the inner ring piece and the outer ring piece, and the air holes are formed between every two adjacent connecting pieces.

Preferably, a height H of the inner ring member in the direction of the rotor rotation axis b is greater than a height H of the outer ring member in the direction of the rotor rotation axis b.

Preferably, the filter screen is a conical surface-shaped structure, and the filter screen extends from the inner ring piece to the outer ring piece.

Preferably, the motor is an inner rotor motor or an outer rotor motor.

An electric tool comprises the motor.

Preferably, the power tool is an angle grinder.

The invention has the beneficial effects that:

the invention provides a motor which comprises a rotor, a stator and a dustproof assembly, wherein an airflow channel is arranged between the stator and the rotor, two ends of the airflow channel are respectively covered with the dustproof assembly, the dustproof assembly comprises a support frame and a filter screen, the support frame is fixedly arranged on the rotor, and the filter screen covers a ventilation hole on the support frame. Through respectively setting up a dustproof subassembly at airflow channel's both ends, can carry out the omnidirectional dustproof to the motor, avoid the foreign matter to get into between stator and the rotor from airflow channel's both ends, be favorable to improving dustproof effect. And the filter screen is fixed on the rotor by utilizing the support frame, so that the synchronous rotation of the filter screen and the rotor can be realized, the purpose of throwing away the foreign matters accumulated on the filter screen is achieved, the self-cleaning of the filter screen is favorably realized, and the foreign matters accumulated on the filter screen are prevented from blocking the inlet and the outlet of the air flow channel.

Drawings

FIG. 1 is a schematic structural diagram of a motor provided by the present invention;

FIG. 2 is a schematic view of the motor provided by the present invention from another perspective;

FIG. 3 is an exploded view of the motor provided by the present invention;

FIG. 4 is a front view of the motor provided by the present invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 4;

FIG. 6 is a schematic structural view of the support frame provided in the present invention;

fig. 7 is a schematic structural diagram of the support frame provided by the present invention from another perspective.

In the figure:

1. a rotor; 2. a stator; 3. a dust-proof assembly; 31. a support frame; 311. an inner ring member; 312. an outer ring member; 313. a connecting member; 314. air holes are formed; 315. a reinforcement; 316. a reinforcing rib plate; 32. and (4) a filter screen.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The present embodiment provides a motor that can be applied to a power tool. The motor is specifically described below by taking the motor as an example for application to an angle grinder. The motor provides power for the angle grinder to perform grinding operation or cutting operation. The motor may be an internal rotor motor or an external rotor motor, and in this embodiment, the internal rotor motor is taken as an example for description, and as shown in fig. 1 to 5, the motor specifically includes a rotor 1, a stator 2, and a dust-proof assembly 3. The rotor 1 and the stator 2 are coaxially nested, the rotor 1 is sleeved in the stator 2, an airflow channel allowing airflow to pass is arranged between the stator 2 and the rotor 1, and the airflow flows through the airflow channel and can take away heat generated by the operation of the rotor 1. The inlet end and the outlet end of the airflow channel are respectively covered with a dustproof component 3 to prevent foreign matters from entering the airflow channel from the inlet end or the outlet end of the airflow channel. When the motor is used in an angle grinder, the foreign matter herein refers to chips, such as iron chips, etc., generated during the operation of the angle grinder.

Specifically, the structures of the dustproof members 3 located at both ends of the airflow path are the same, and each dustproof member 3 includes a support frame 31 and a filter screen 32. The supporting frame 31 is of an annular structure, the supporting frame is sleeved on the rotor 1, the inner annular surface of the supporting frame 31 is fixedly connected with the rotor 1, a small gap is formed between the outer annular surface and the stator 2, the size of the gap is not specifically limited, but the gap is ensured not to enable foreign matters to pass through. When the rotor 1 rotates, the support frame 31 can rotate synchronously with the rotor 1. The supporting frame 31 is provided with a vent hole 314 communicated with the air flow channel, and the filter screen 32 is covered on the vent hole 314.

Compare in prior art and not set up dustproof subassembly 3 or only set up a dustproof subassembly 3 in airflow channel's entrance, in this embodiment, respectively set up a dustproof subassembly 3 through two tip in airflow channel's entry and export, can carry out the omnidirectional dustproof to the motor, thereby avoid foreign matters such as iron fillings to be inhaled the airflow channel from airflow channel's both ends and cause the foreign matter to gather between stator 2 and rotor 1, thereby can avoid the emergence of motor inefficacy phenomenon effectively, be favorable to reducing the fault rate of motor, improve the life of motor. And fix filter screen 32 on rotor 1 through utilizing support frame 31, can realize the synchronous rotation of filter screen 32 and rotor 1 to the realization utilizes centrifugal force to throw away the foreign matter that gathers on filter screen 32, is favorable to reaching the dustproof and self-cleaning of filter screen 32 and goes on in step, not only can avoid gathering the entry and the export of the foreign matter jam air current passageway on filter screen 32, and can avoid the emergence of the incident that artifical cleanness caused.

Specifically, as shown in fig. 6 and 7, the support frame 31 includes an inner ring member 311, an outer ring member 312 and a reinforcement member 315, wherein the reinforcement member 315, the inner ring member 311 and the outer ring member 312 are sequentially nested from inside to outside, and central axes of the three members coincide. The reinforcing member 315 is a ring-shaped structure and is disposed at the innermost side of the supporting frame 31, and the reinforcing member 315 is sleeved on the end portion of the rotor 1, so as to fix the supporting frame 31 and the rotor 1. In order to improve the structural strength of the support bracket 31, a reinforcing rib 316 is provided between the reinforcement 315 and the inner ring 311. Specifically, the reinforcing rib 316 includes a ring plate and a strip plate, the outer annular surface of the ring plate is attached to and fixedly connected with the inner wall surface of the inner ring 311, the inner annular surface of the ring plate is attached to and fixedly connected with the outer wall surface of the reinforcement 315, the strip plate is disposed on the ring plate, one end of the strip plate is connected with the inner ring 311, and the other end of the strip plate is connected with the reinforcement 315. The number of the strip-shaped plates is preferably plural, and the plural strip-shaped plates are preferably arranged radially. The inner ring piece 311 and the outer ring piece 312 are both of annular structures, a plurality of strip-shaped connecting pieces 313 are arranged between the inner ring piece 311 and the outer ring piece 312, the air holes 314 are formed between every two adjacent connecting pieces 313, and the filter screen 32 covers the air holes 314. The connecting pieces 313 are preferably arranged radially, and the connecting pieces 313 and the strip-shaped plates can be arranged in a collinear manner, can also be arranged in a staggered manner, and are preferably arranged in a staggered manner, so that the uniform stress of the whole supporting frame 31 is ensured.

In the present embodiment, the filter screen 32 is an annular structure, which is located between the inner ring member 311 and the outer ring member 312, and is supported by the connection member 313. Of course, in other embodiments, the filter screen 32 may include a plurality of arc-shaped sheet structures, and each of the filter screens 32 having the arc-shaped sheet shape is disposed between two adjacent connection members 313. In order to improve the assembly efficiency, it is preferable to use the annular filter net 32. Further, the material of the filter screen 32 is not specifically limited, and may be specifically set according to the requirement, for example, plastic or stainless steel may be selected. In the present embodiment, in order to provide the filter screen 32 with a long service life, it is preferable to use the filter screen 32 made of stainless steel material. In order to make the filter screen 32 have a better dustproof effect without affecting the airflow, in this embodiment, the filter screen 32 with a mesh number between 50 and 200 is selected, optionally, the mesh number of the filter screen 32 may be 50, 100, 150, or 200, and in this embodiment, the mesh number of the filter screen 32 is 100.

Further, in order to improve the self-cleaning ability of the dust-proof assembly 3 and to make it easier for foreign matter on the dust-proof assembly 3 to be thrown away by centrifugal force, the surface of the filter screen 32 is inclined with respect to the rotation axis b of the rotor 1 by an angle a of between 0 ° and 90 °, preferably between 30 ° and 60 °, in this embodiment, a is selected to be 60 °. The two filter screens 32 at the two ends of the air flow path are arranged oppositely and have opposite inclination directions. Specifically, the distance between the two filter screens 32 gradually increases from the outside to the inside in the radial direction of the rotor 1. In the present embodiment, the filter screen 32 is conical and extends from the inner ring member 311 to the outer ring member 312. In order to facilitate installation of the conical filter screen 32, the height H of the inner ring member 311 in the direction of the rotation axis b of the rotor 1 is set to be greater than the height H of the outer ring member 312 in the direction of the rotation axis b of the rotor 1. Of course, if the filter screen 32 is an arc-shaped sheet structure, it is only necessary to arrange the filter screen obliquely between the inner ring member 311 and the outer ring member 312.

The present embodiment also provides a power tool, and in the present embodiment, the power tool is an angle grinder, which includes a housing, a grinding mechanism, a fan, and the above-mentioned motor. The fan and the motor are both arranged inside the shell, and the polishing mechanism is arranged outside the shell and is in transmission connection with the output end of the motor. The motor is located between fan and the grinding mechanism, and one of them dustproof subassembly 3 sets up between grinding mechanism and motor, and another dustproof subassembly 3 sets up between motor and fan. The angle grinder can effectively prevent foreign matters from entering between the stator 2 and the rotor 1 of the motor, is favorable for reducing the failure rate, and improves the service life and the use safety of the angle grinder.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electric machine comprising a rotor (1) and a stator (2),

an airflow channel is arranged between the stator (2) and the rotor (1), and two ends of the airflow channel are respectively covered with a dustproof assembly (3);

each dustproof component (3) all includes support frame (31) and filter screen (32), support frame (31) are fixed to be set up on rotor (1), and can with rotor (1) rotates in step, be provided with on support frame (31) with bleeder vent (314) of airflow channel intercommunication, establish filter screen (32) lid on bleeder vent (314).

2. The electric machine of claim 1,

the filter screen (32) is arranged obliquely to the axis of rotation b of the rotor (1).

3. The electric machine of claim 2,

the angle of inclination a of the screen surface of the screen (32) relative to the axis of rotation b of the rotor (1) is 30-60 °.

4. The electric machine of claim 2,

the two filter screens (32) are opposite to the inclination direction of the rotor (1), and the distance between the two filter screens (32) is gradually increased from outside to inside along the radial direction of the rotor (1).

5. The machine according to any of claims 2-4,

the support frame (31) comprises an inner ring piece (311) and an outer ring piece (312), the inner ring piece (311) is sleeved in the outer ring piece (312), a plurality of connecting pieces (313) are arranged between the inner ring piece (311) and the outer ring piece (312), and the air holes (314) are formed between every two adjacent connecting pieces (313).

6. The electric machine of claim 5,

the height H of the inner ring piece (311) along the direction of the rotation axis b of the rotor (1) is larger than the height H of the outer ring piece (312) along the direction of the rotation axis b of the rotor (1).

7. The electric machine of claim 6,

the filter screen (32) is of a conical surface-shaped structure, and the filter screen (32) extends from the inner ring piece (311) to the outer ring piece (312).

8. The electric machine of claim 7, wherein the electric machine is an internal rotor electric machine or an external rotor electric machine.

9. An electric power tool comprising the motor according to any one of claims 1 to 8.

10. The power tool of claim 9,

the power tool is an angle grinder.