CN210111750U - Electric hair drier motor and air duct shell - Google Patents

Abstract

The utility model relates to a hair dryer motor and an air duct shell, wherein the hair dryer motor comprises an air duct shell provided with a bearing fixing block, a stator component, a first bearing, a second bearing and a third bearing; the bearing fixing block is provided with a first central through hole and a front end part, and the front end part is provided with a first containing cavity; the first bearing and the second bearing are arranged in a first central through hole of a bearing fixing block of the air duct shell; the third bearing is arranged in a third bearing chamber of a front bobbin of the stator assembly; the rear part of a stator core of the stator assembly is fixed in a first accommodating cavity at the front end part of the bearing fixing block; the front end of the air duct shell is provided with a first notch, and the air duct shell is directly provided with a grounding terminal at the first notch. The utility model discloses hairdryer motor has rational in infrastructure, the ground connection is convenient, the noise is little, fixed firm and heat dissipation advantage such as good.

Description

Electric hair drier motor and air duct shell

[ technical field ] A method for producing a semiconductor device

The utility model relates to a small-size or micro motor especially relates to the motor that is used for the hairdryer.

[ background of the invention ]

A small or miniature motor, such as a high-speed permanent magnet brushless motor, has a series of advantages of large power density, small geometric dimension, fast dynamic response, high operation efficiency and the like, and has wide application prospect in high-speed operation occasions, such as a hair dryer, in which a high-speed permanent magnet brushless motor is used.

The motor that prior art was used for on hairdryer includes the wind channel casing, stator module, the rotor subassembly, first bearing and second bearing, stator module, first bearing and second bearing are fixed respectively in the wind channel casing for fixed firm glue that generally adopts, and stator module and wind channel casing, first bearing and second bearing and wind channel casing are because the fit clearance is very little, in the assembling process, glue is extruded easily, thereby lead to stator module and wind channel casing, glue between first bearing and second bearing and the wind channel casing is less, it is not enough to lead to bonding strength, first bearing, second bearing and stator module shift easily. The electric hair drier motor and the air duct shell in the prior art are relatively stressed when being started, so that the rotating shaft of the rotor component is easily bent for a short time, the rotating shaft is easily contacted with the inner wall of the stator core of the stator component, and starting abnormal sound is caused.

The motor that prior art was used for on the hairdryer only includes two bearings, and this motor is when starting, and the rotor subassembly can swing, and especially this motor is used for on the hairdryer, and the rotational speed is very high, and the rotor subassembly swing is more severe, leads to the permanent magnet on the rotor subassembly to scrape stator core of stator module, can produce sharp-pointed noise, damages the permanent magnet on the rotor subassembly and stator core of stator module moreover easily.

In order to prevent electromagnetic coupling interference and personal safety, the motor needs to be grounded, and the air duct shell of the motor used for the hair dryer in the prior art is not grounded, a threaded hole is usually formed by tapping after the air duct shell is punched, then one end of a lead is fixed on the threaded hole of the air duct shell by a screw, and the other end of the lead is electrically connected to a grounding line of the hair dryer, so that the working time is increased, the cost is also increased, and the hair dryer is very inconvenient.

[ Utility model ] content

The to-be-solved technical problem of the utility model lies in avoiding the weak point of above-mentioned prior art and providing a hairdryer motor and air duct casing, have rational in infrastructure, the ground connection is convenient, the noise is little, fixed firm and dispel the heat advantage such as good.

The utility model provides a technical scheme that technical problem adopted is:

the electric hair drier motor comprises an air duct shell with openings at two ends and a hollow interior, a stator assembly, a rotor assembly, a fan blade, a first bearing, a second bearing and a third bearing; the stator assembly comprises a stator core; the rotor assembly comprises a rotating shaft and a permanent magnet part, and the permanent magnet part is fixed at the front end of the rotating shaft; a bearing fixing block is arranged in the air duct shell and is fixed on the inner wall of the air duct shell through at least two ribs, an air duct for air circulation is formed between every two adjacent ribs, the bearing fixing block is provided with a first central through hole capable of accommodating the first bearing and the second bearing, the front end of the bearing fixing block of the air duct shell is also provided with a cylindrical front end part, and the front end part is provided with a first accommodating cavity for accommodating the rear part of the stator assembly; the rear part of a stator core of the stator assembly is fixed in a first cavity at the front end part of a bearing fixing block of the air duct shell, one part of the stator core of the stator assembly is positioned in the air duct shell, and the other part of the stator core of the stator assembly is positioned outside the air duct shell; the first bearing and the second bearing are arranged in a first central through hole of a bearing fixing block of the air duct shell; the stator assembly further comprises a front wire frame made of engineering plastics, and the front wire frame is provided with a third bearing chamber for accommodating the third bearing; the front wire frame is arranged at the front end part of the stator core, and the third bearing is installed and fixed in a third bearing chamber of the front wire frame; the rear end of the rotating shaft of the rotor assembly is inserted into the inner hole of the second bearing and the inner hole of the first bearing respectively, the front end of the rotating shaft of the rotor assembly is positioned in the inner hole of the third bearing on the front wire frame, and the permanent magnet component of the rotor assembly is positioned in the inner cavity of the stator core of the stator assembly; the fan blade is positioned in the air duct shell and fixed at the rear end of the rotating shaft; the front end of the air duct shell is provided with a first notch, and the air duct shell is directly provided with a grounding terminal at the first notch.

The inner wall of a first central through hole of a bearing fixing block of the air duct shell is provided with at least one first axial groove for storing glue, and the inner wall of a first containing cavity at the front end part of the bearing fixing block is provided with at least one second axial groove for storing glue; the first bearing and the second bearing are fixedly arranged in a first central through hole of a bearing fixing block of the air duct shell by glue, and a part of glue is stored in a first axial groove of the first central through hole of the bearing fixing block; the rear part of the stator core of the stator assembly is fixed in a first containing cavity at the front end part of the bearing fixing block by glue, and a part of glue is stored in a second axial groove of the first containing cavity at the front end part.

The depth of the first axial groove is 0.03-0.08 mm; the depth of the second axial groove is 0.03-0.08 mm.

The front end part of the bearing fixing block is provided with at least one notch.

The hair drier motor also comprises an elastic element arranged between the first bearing and the second bearing.

The air duct shell is an annular shell with openings at two ends and a hollow interior, a bearing fixing block is arranged in the air duct shell and fixed on the inner wall of the air duct shell through at least two ribs, an air duct for air circulation is formed between every two adjacent ribs, the bearing fixing block is provided with a first central through hole capable of accommodating a first bearing and a second bearing of the motor, the front end of the bearing fixing block of the air duct shell is also provided with a cylindrical front end part, and the front end part is provided with a first containing cavity for accommodating the rear part of a stator assembly of the motor; the front end of the air duct shell is provided with a first notch, and the air duct shell is directly provided with a grounding terminal at the first notch.

Compared with the prior art, the utility model discloses hairdryer motor and wind channel casing's beneficial effect lies in:

firstly, the utility model discloses specially intend to be equipped with the ground terminal directly at the front end of wind channel casing, just can directly connect the conductive metal of whole motor namely wind channel casing and this finished earth circuit of hairdryer through a lead wire of this connector of female terminal of taking, so more convenient operation is connected, has practiced thrift man-hour and manual work, the cost is reduced, has the convenient advantage of ground connection; the following two functions are realized: firstly, electromagnetic coupling interference is prevented, and secondly, the problem that a user gets an electric shock or even the personal safety is endangered if the motor is damaged due to insulation and possible conduction is avoided;

at least one first axial groove for storing glue is specially arranged on the inner wall of a first central through hole of the bearing fixing block, and at least one second axial groove for storing glue is arranged on the inner wall of a first containing cavity at the front end part of the bearing fixing block; when the stator core, the first bearing and the second bearing are fixed by glue, a part of glue can be stored in the first axial groove and the second axial groove, so that the stator core, the first bearing and the second bearing are fixed more firmly;

one part of the stator assembly is positioned in the air duct shell, and the other part of the stator assembly is positioned outside the air duct shell, so that the heat dissipation of the stator assembly is facilitated, the heat dissipation of the three bearing motor is good, the temperature rise is low, and the service life is long;

fourthly, at least one notch is arranged at the front end part of the bearing fixing block, so that the stator assembly positioned in the air duct shell can dissipate heat better;

an elastic element is arranged between the first bearing and the second bearing, so that the first bearing and the second bearing have certain pre-pressure, the internal clearance of the bearing is eliminated, and noise is reduced;

sixthly, be provided with the bearing fixed block that can hold first bearing and second bearing in the air duct casing, still be equipped with the third bearing room that is used for holding the third bearing on the line frame in the front, adopt three bearing, increased the fixed fulcrum of the pivot of rotor subassembly, make the utility model discloses three bearing motor has alleviateed the swing of rotor subassembly when starting, and the swing is less, has also avoided the permanent magnet part of rotor subassembly to scrape stator core of stator module, and the noise is little.

To sum up, the utility model discloses hairdryer motor and wind channel casing have rational in infrastructure, the ground connection is convenient, the noise is little, fixed firm and heat dissipation advantage such as good.

[ description of the drawings ]

Fig. 1 is a schematic view of the axial projection of the hair dryer motor of the present invention, in which the female terminal 98 on a lead wire 99 is inserted into the ground terminal 16 of the air duct housing 10;

FIG. 2 is a front cross-sectional view of the hair dryer motor in an orthographic projection;

FIG. 3 is a schematic view of an exploded axonometric projection of the hair dryer motor;

FIG. 4 is a schematic view of the axial projection of the air duct housing of the hair dryer motor;

FIG. 5 is a schematic isometric view of the duct housing in another orientation;

FIG. 6 is a front cross-sectional elevation view of the duct housing.

[ detailed description ] embodiments

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 to 6, a hair dryer motor comprises an air duct housing 10 with two open ends and a hollow interior, a stator assembly 20, a rotor assembly 30, a fan blade 40, a first bearing 51, a second bearing 52 and a third bearing 53; the stator assembly 20 includes a stator core 21; the rotor assembly 30 comprises a rotating shaft 31 and a permanent magnet part 32, wherein the permanent magnet part 32 is fixed at the front end of the rotating shaft 31; a bearing fixing block 11 is arranged in the air duct shell 10, the bearing fixing block 11 is fixed on the inner wall of the air duct shell 10 through at least two ribs 12, an air duct 13 for air circulation is formed between every two adjacent ribs 12, the bearing fixing block 11 is provided with a first central through hole 111 capable of accommodating the first bearing 51 and the second bearing 52, the front end of the bearing fixing block 11 of the air duct shell 10 is further provided with a cylindrical front end portion 119, and the front end portion 119 is provided with a first accommodating cavity 1199 for accommodating the rear portion of the stator assembly 20; the rear part of the stator core 21 of the stator assembly 20 is fixed in the first cavity 1199 of the front end 119 of the bearing fixing block 11 of the air duct shell 10, a part of the stator core 21 of the stator assembly 20 is located in the air duct shell 10, and the other part of the stator core 21 of the stator assembly 20 is located outside the air duct shell 10; the first bearing 51 and the second bearing 52 are installed in the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10; the stator assembly 20 further includes a front bobbin 22 made of engineering plastic, the front bobbin 22 being provided with a third bearing chamber 221 for accommodating the third bearing 53; the front bobbin 22 is disposed at the front end of the stator core 21, and the third bearing 53 is fixedly mounted in the third bearing chamber 221 of the front bobbin 22; the rear end of the rotating shaft 31 of the rotor assembly 30 is inserted into the inner hole of the second bearing 52 and the inner hole of the first bearing 51 respectively, the front end of the rotating shaft 31 of the rotor assembly 30 is located in the inner hole of the third bearing 53 on the front bobbin 22, and the permanent magnet part 32 of the rotor assembly 30 is located in the inner cavity of the stator core 21 of the stator assembly 20; the fan blade 40 is positioned in the air duct shell 10 and fixed at the rear end of the rotating shaft 31; a first notch 15 is formed in the front end of the air duct shell 10, and a grounding terminal 16 is directly arranged on the air duct shell 10 at the first notch 15; the grounding terminal 16 is equivalent to a male terminal, so that the whole air duct shell of the motor can be connected with the finished grounding circuit of the hair dryer by a lead 99 with a female terminal 98, and the operation is very convenient.

Referring to fig. 4 and 5, the inner wall of the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10 is provided with at least one first axial groove 1111 for storing glue, and the inner wall of the first cavity 1199 of the front end 119 of the bearing fixing block 11 is provided with at least one second axial groove 11999 for storing glue; the first bearing 51 and the second bearing 52 are fixed in the first central through hole 111 of the bearing fixing block 11 of the air duct housing 10 by glue, a part of glue is stored in the first axial grooves 1111 of the first central through hole 111 of the bearing fixing block 11, the number of the first axial grooves 1111 may be designed to be larger, but not too large, for example, the number of the first axial grooves 1111 may be 4 to 6, the depth of the first axial grooves 1111 is not too deep, and the depth is generally 0.03 to 0.08 mm; the rear part of the stator core 21 of the stator assembly 20 is fixed in the first cavity 1199 of the front end portion 119 of the bearing fixing block 11 by glue, a part of glue is stored in the second axial grooves 11999 of the first cavity 1199 of the front end portion 119, the number of the second axial grooves 11999 can be designed to be larger, but not too large, for example, the number of the second axial grooves 11999 can be 3 to 6, and the depth of the second axial grooves 11999 is not too deep, and generally the depth is 0.03 to 0.08 mm.

The rotating shaft 31 can be made of ceramic materials, so that the rotating shaft 31 is better stressed, good in thermal stability and high in mechanical strength; like this hairdryer motor is when starting, and pivot 31 can bear great power, and pivot 31 bending deformation is little, and pivot 31 is difficult to contact with the stator core inner wall of stator module, can not cause the unusual sound of start friction.

Referring to fig. 2, 5 and 6, a second receiving chamber 1197 is further formed at the front end 119 of the bearing fixing block 11 to receive the rear end of the stator assembly 20.

Referring to fig. 4 and 5, in order to enhance the strength and firmness of the bearing fixing block 11, the number of the ribs 12 may be designed to be larger, but not too large, for example, the number of the ribs 12 may be 5 to 10. In order to enhance the strength and firmness of the front end 119 of the bearing fixing block 11, a plurality of ribs may be separately designed on the front end 119 of the bearing fixing block 11.

Referring to fig. 1 to 6, in practice, the duct housing 10, the bearing fixing block 11, the front end 119 of the bearing fixing block 11 and the ribs 12 are the same component, but they may be assembled by different components.

Referring to fig. 1 to 3, the third bearing 53 is disposed in the third bearing chamber 221 of the front frame 22, the front frame 22 is located outside the air duct housing 10 in the outside air, and the third bearing chamber 221 of the front frame 22 faces outward and communicates with the outside, so that the heat dissipation effect of the third bearing 53 is better.

Referring to fig. 5, in order to better dissipate heat of the stator assembly 20, the front end 119 of the bearing fixing block 11 is provided with at least one notch 1198, in the drawing, the front end 119 is uniformly provided with three notches 1198, that is, the three notches 1198 divide the front end 119 into three blocks, and the inner wall of the first accommodating cavity 1199 of each front end 119 is provided with at least one second axial groove 11999.

Referring to fig. 2, the length of the stator core 21 located outside the air duct housing 10 is greater than the length of the stator core 21 located inside the air duct housing 10; that is, only a small portion of the stator assembly 20 is located within the air duct housing 10, and a large portion of the stator assembly 20 is outside the air duct housing 10, which is beneficial for heat dissipation.

Referring to fig. 2 and 3, in order to eliminate the play inside the first bearing 51 and the second bearing 52 and reduce noise, the hair dryer motor further includes an elastic element 59 installed between the first bearing 51 and the second bearing 52; the two ends of the elastic element 59 are respectively pressed between the outer ring of the first bearing 51 and the outer ring of the second bearing 52 to provide a certain pre-pressure to the first bearing 51 and the second bearing 52 so as to eliminate the respective internal clearances of the first bearing 51 and the second bearing 52, which is more beneficial to reducing noise, because the first bearing 51 and the second bearing 52 generally adopt ball bearings, and the ball bearings comprise an inner ring and an outer ring, and balls and a retainer between the inner ring and the outer ring, the ball bearings have clearances inside, after the certain pre-pressure is provided to the bearings, the outer rings of the bearings can press the balls, and the balls press the inner rings, so that the internal clearances of the bearings are eliminated. The resilient element 59 may be a spring.

Referring to fig. 1 to 3, generally the stator assembly 20 includes a stator core 21, a front bobbin 22, and stator windings (not shown), and for convenience and robustness of wiring, the stator assembly 20 further includes a terminal plate 29, a plurality of pins 28, and a plug 27; one end of each of the plurality of pins 28 is electrically connected to a stator coil (not shown) of a stator winding of the stator assembly 20, and the other end thereof is electrically connected to the terminal plate 29 to fix the terminal plate 29; the plug 27 is electrically connected and fixed to the terminal block 29.

Referring to fig. 1 to 6, the present invention further provides an air duct housing 10 for a hair dryer motor, the air duct housing 10 is an annular housing with two open ends and a hollow interior, a bearing fixing block 11 is disposed in the air duct housing 10, the bearing fixing block 11 is fixed on an inner wall of the air duct housing 10 through at least two ribs 12, an air duct 13 for air circulation is formed between two adjacent ribs 12, the bearing fixing block 11 is provided with a first central through hole 111 capable of accommodating a first bearing 51 and a second bearing 52 of the motor, the front end of the bearing fixing block 11 of the air duct housing 10 is further provided with a cylindrical front end portion 119, and the front end portion 119 is provided with a first accommodating cavity 1199 for accommodating a rear portion of a stator assembly 20 of the motor; the front end of the air duct shell 10 is provided with a first gap 15, and the air duct shell 10 is directly provided with a grounding terminal 16 at the first gap 15.

The above-mentioned embodiments only represent the preferred embodiments of the present invention, and the description thereof is more specific and detailed, but it is not understood to limit the scope of the invention, it should be noted that, for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention, therefore, all the equivalent changes and modifications made with the scope of the claims of the present invention shall belong to the coverage of the claims of the present invention.

Claims (10)

1. A hair drier motor comprises an air duct shell (10) with openings at two ends and a hollow interior, a stator assembly (20), a rotor assembly (30), fan blades (40), a first bearing (51), a second bearing (52) and a third bearing (53); the stator assembly (20) comprises a stator core (21); the rotor assembly (30) comprises a rotating shaft (31) and a permanent magnet component (32), and the permanent magnet component (32) is fixed at the front end of the rotating shaft (31); a bearing fixing block (11) is arranged in the air duct shell (10), the bearing fixing block (11) is fixed on the inner wall of the air duct shell (10) through at least two ribs (12), an air duct (13) for air circulation is formed between every two adjacent ribs (12), the bearing fixing block (11) is provided with a first central through hole (111) capable of accommodating the first bearing (51) and the second bearing (52), the front end of the bearing fixing block (11) of the air duct shell (10) is also provided with a cylindrical front end part (119), and the front end part (119) is provided with a first accommodating cavity (1199) for accommodating the rear part of the stator assembly (20); the rear part of a stator core (21) of the stator assembly (20) is fixed in a first accommodating cavity (1199) of the front end part (119) of a bearing fixing block (11) of the air duct shell (10), one part of the stator core (21) of the stator assembly (20) is positioned in the air duct shell (10), and the other part of the stator core (21) of the stator assembly (20) is positioned outside the air duct shell (10); the first bearing (51) and the second bearing (52) are arranged in a first central through hole (111) of a bearing fixing block (11) of the air duct shell (10); the method is characterized in that:

the stator assembly (20) further comprises a front line frame (22) made of engineering plastics, and the front line frame (22) is provided with a third bearing chamber (221) used for accommodating the third bearing (53); the front wire frame (22) is arranged at the front end part of the stator core (21), and the third bearing (53) is fixedly installed in a third bearing chamber (221) of the front wire frame (22); the rear end of the rotating shaft (31) of the rotor assembly (30) is inserted into an inner hole of the second bearing (52) and an inner hole of the first bearing (51) respectively, the front end of the rotating shaft (31) of the rotor assembly (30) is positioned in an inner hole of a third bearing (53) on the front wire frame (22), and a permanent magnet component (32) of the rotor assembly (30) is positioned in an inner cavity of a stator core (21) of the stator assembly (20); the fan blade (40) is positioned in the air duct shell (10) and fixed at the rear end of the rotating shaft (31);

the front end of the air duct shell (10) is provided with a first notch (15), and the air duct shell (10) is directly provided with a grounding terminal (16) at the first notch (15).

2. A hair dryer motor as set forth in claim 1, characterized in that:

the inner wall of a first central through hole (111) of a bearing fixing block (11) of the air duct shell (10) is provided with at least one first axial groove (1111) for storing glue, and the inner wall of a first accommodating cavity (1199) at the front end part (119) of the bearing fixing block (11) is provided with at least one second axial groove (11999) for storing glue; the first bearing (51) and the second bearing (52) are fixedly arranged in a first central through hole (111) of a bearing fixing block (11) of the air duct shell (10) by glue, and a part of glue is stored in a first axial groove (1111) of the first central through hole (111) of the bearing fixing block (11); the rear part of a stator core (21) of the stator assembly (20) is fixed in a first containing cavity (1199) of the front end part (119) of the bearing fixing block (11) by glue, and a part of glue is stored in a second axial groove (11999) of the first containing cavity (1199) of the front end part (119).

3. A hair dryer motor as set forth in claim 2, characterized in that:

the depth of the first axial grooves (1111) is 0.03-0.08 mm.

4. A hair dryer motor as set forth in claim 2, characterized in that:

the depth of the second axial groove (11999) is 0.03-0.08 mm.

5. A hair dryer motor as set forth in claim 1, characterized in that:

the front end (119) of the bearing fixing block (11) is provided with at least one notch (1198).

6. A hair dryer motor as claimed in any of claims 1 to 5, characterized in that:

further comprising an elastic element (59) mounted between said first bearing (51) and said second bearing (52).

7. An air duct shell (10) is used for an electric hair dryer motor, the air duct shell (10) is an annular shell with openings at two ends and a hollow interior, a bearing fixing block (11) is arranged in the air duct shell (10), the bearing fixing block (11) is fixed on the inner wall of the air duct shell (10) through at least two ribs (12), an air duct (13) for air circulation is formed between every two adjacent ribs (12), the bearing fixing block (11) is provided with a first central through hole (111) capable of accommodating a first bearing (51) and a second bearing (52) of the motor, the front end of the bearing fixing block (11) of the air duct shell (10) is further provided with a cylindrical front end part (119), and the front end part (119) is provided with a first accommodating cavity (1199) for accommodating the rear part of a stator assembly (20) of the electric hair dryer motor; the method is characterized in that:

the front end of the air duct shell (10) is provided with a first notch (15), and the air duct shell (10) is directly provided with a grounding terminal (16) at the first notch (15).

8. The air duct housing (10) of claim 7, characterized in that:

the inner wall of a first central through hole (111) of the bearing fixing block (11) is provided with at least one first axial groove (1111) for storing glue, and the inner wall of a first accommodating cavity (1199) at the front end part (119) of the bearing fixing block (11) is provided with at least one second axial groove (11999) for storing glue.

9. The air duct housing (10) of claim 8, wherein:

the depth of the first axial groove (1111) is 0.03-0.08 mm; the depth of the second axial groove (11999) is 0.03-0.08 mm.

10. The air duct housing (10) of claim 7, characterized in that:

the front end (119) of the bearing fixing block (11) is provided with at least one notch (1198).

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