CN112377437A

CN112377437A - Electric fan and hair drier of using thereof

Info

Publication number: CN112377437A
Application number: CN202011250720.5A
Authority: CN
Inventors: 周吕辉; 沈昌; 王霖
Original assignee: Wuxi Convert Electrical Machinery Co ltd
Current assignee: Wuxi Convert Electrical Machinery Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-02-19

Abstract

The invention discloses an electric fan and a blower using the same, comprising a rotor and an impeller which are installed with a rotating shaft into a whole, and a stator which is connected with the rotor in an electromagnetic coupling way; the outer shell is positioned at the periphery, the inner shell is relatively rotatably arranged at the periphery of the rotating shaft, and a plurality of diffusion blades are arranged between the outer shell and the inner shell; the inner shell is positioned between the stator and the impeller, and a return sheet for reducing air flow loss is arranged between the stator and the inner shell; according to the invention, through the structural design of the specific backflow sheet, the flow in the electric fan is more smooth, the air pressure is higher, the problem of air flow loss in the shell can be effectively reduced, the working efficiency is improved, and the air flow noise is reduced.

Description

Electric fan and hair drier of using thereof

Technical Field

The invention belongs to the field of fans, particularly relates to an electric fan and further relates to a blower applied to the electric fan.

Background

As a household standby handheld electric appliance product, a hair dryer is expected to have good performances of compactness of a mounting structure, low noise and high working efficiency, so that a user obtains good use experience. The electric fan is used as a core working component of the hair dryer, and directly determines related performance performances of the hair dryer such as installation structure compactness, noise, working efficiency and the like.

The electric fan mainly comprises a stator, a rotor, an impeller and other structural parts which are installed into a whole through a shell, the specific working principle of the electric fan is that the rotor is driven to rotate through the electromagnetic coupling effect between the stator and the rotor, and then the impeller is driven to rotate, so that the blowing effect is achieved. In order to improve the transmission effect of air flow diffusion towards the end of the impeller, the existing electric fan is provided with a diffusion blade at the rear end of the impeller by selecting the inner circumference of the shell. However, the performance of the existing electric fan in terms of air flow efficiency and low noise is still not ideal. In addition, the rotor of the existing electric fan has poor performance on the dynamic balance effect, and the installation process of the stator is complex and the stability is not reliable enough.

Therefore, the applicant hopes to develop new electric fan products to respectively improve the above technical problems, and intensively apply for patent.

Disclosure of Invention

In view of this, the present invention provides an electric fan and a hair dryer using the same, which, through a specific structure design of a backflow sheet, enable the flow inside the electric fan to flow more smoothly and the wind pressure to be higher, and can effectively reduce the problem of air flow loss inside a housing, so as to improve the working efficiency and reduce the air flow noise.

The technical scheme adopted by the invention is as follows:

an electric fan comprises a rotor and an impeller which are integrally installed with a rotating shaft, and a stator which is in electromagnetic coupling connection with the rotor; the outer shell is positioned at the periphery, the inner shell is relatively rotatably arranged at the periphery of the rotating shaft, and a plurality of diffusion blades are arranged between the outer shell and the inner shell; wherein, the inner casing is located between stator and the impeller, installs the return flow piece that reduces the air current loss simultaneously between stator and inner casing.

Preferably, the backflow sheet comprises a backflow seat contacted with the end face of the inner shell and a backflow wall extending upwards from the periphery of the backflow seat to the end face of the stator.

Preferably, the return sheet is fixedly installed on the stator, and the outer diameter of the return sheet is larger than that of the inner housing, and the return wall is in a conical shape.

Preferably, the backflow seat and the backflow wall are in an integral connection structure.

Preferably, the backflow wall is provided with a plurality of limiting notches which are distributed at intervals, and the end part of the stator is provided with limiting convex teeth which are in limiting installation connection with the limiting notches.

Preferably, the stator comprises a stator core and a winding arranged on the inner periphery of the stator core, the winding is in power-on connection with the controller, and the upper end of the outer shell is installed on the outer periphery of the stator core in a limiting mode.

Preferably, the inner periphery of the upper end of the outer shell is provided with 1 or more first limiting ribs, and the outer periphery of the stator core is provided with limiting grooves which are matched with the first limiting ribs in a limiting and installing mode.

Preferably, the inner periphery of the upper end of the outer shell is provided with 1 or more second limiting ribs, and the second limiting ribs are arranged on the periphery of the stator core in a clearance fit mode and used for realizing radial limiting of the stator core.

Preferably, the diffuser blade is located at the inner periphery of the lower end of the outer shell, and each limiting rib and each diffuser blade respectively correspond to each other to realize integral connection.

Preferably, the blower comprises an electric fan arranged in a blower shell, and the electric fan adopts the electric fan.

According to the invention, the inner shell is arranged between the stator and the impeller, and then the reflux sheet for reducing the airflow loss is arranged between the stator and the inner shell, the reflux sheet comprises the reflux seat which is contacted with the end surface of the inner shell and the reflux wall which extends upwards from the periphery of the reflux seat to the end surface of the stator.

The invention also provides a structural design for directly carrying out limiting installation matching connection on the inner periphery of the upper end of the outer shell and the outer periphery of the stator core, ensures the installation reliability of the stator structure through a simple structure, is convenient and quick in installation process, and avoids the problems that in the prior art, the installation is time-consuming and labor-consuming, and the installation structure is not stable and reliable enough because stator windings are respectively installed in the shell.

The invention also provides a mounting assembly of the rotor and the impeller, which consists of the rotor magnet and the impeller which are respectively and fixedly mounted on the rotating shaft, a bearing for mounting is fixedly sleeved on the rotating shaft positioned between the rotor magnet and the impeller, and a balance block is mounted at the end part of the rotating shaft close to the rotor magnet.

Drawings

FIG. 1 is a schematic structural view of an electric fan according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of the structure at A in FIG. 1;

FIG. 4 is an exploded view of FIG. 1;

FIG. 5 is a schematic structural view of a lower flowsheet according to an embodiment of the present invention;

FIG. 6 is a schematic view of the mounting structure of the stator and the return plates according to the embodiment of the present invention;

FIG. 7 is a schematic view of the structure of FIG. 6 after being rotated by a certain angle;

FIG. 8 is a schematic structural view of the lower outer housing and inner housing of the present invention;

FIG. 9 is a schematic view of the structure of FIG. 8 after being rotated by a certain angle;

fig. 10 is a schematic structural view of a rotor and impeller mounting assembly in accordance with an embodiment of the present invention.

Detailed Description

The embodiment of the invention discloses an electric fan, which comprises a rotor, an impeller and a stator, wherein the rotor and the impeller are integrally installed with a rotating shaft; the outer casing is positioned at the periphery, the inner casing is relatively rotatably arranged at the periphery of the rotating shaft, and a plurality of diffusion blades are arranged between the outer casing and the inner casing; the inner shell is positioned between the stator and the impeller, and a reflux sheet for reducing air flow loss is arranged between the stator and the inner shell.

The embodiment of the invention also discloses a blower which comprises an electric fan arranged in the blower shell, wherein the electric fan adopts the electric fan.

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. 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.

Referring to fig. 1, 2 and 4, an electric fan 1 includes a rotor 10 and an impeller 20 integrally mounted on a rotating shaft, and a stator 30 electromagnetically coupled to the rotor 10; an outer casing 41 located at the outer periphery and an inner casing 42 relatively rotatably installed at the outer periphery of the rotating shaft 11, please refer to fig. 8 and 9, a plurality of diffuser blades 43 are arranged between the outer casing 41 and the inner casing 42; wherein, the inner housing 42 is located between the stator 30 and the impeller 20, and a backflow sheet 50 for reducing air flow loss is installed between the stator 30 and the inner housing 42;

preferably, as further shown in fig. 5, 6 and 7, in the present embodiment, the backflow sheet 50 includes a backflow seat 51 contacting with the end surface of the inner housing 42 and a backflow wall 52 extending upward from the outer periphery of the backflow seat 51 to the end surface of the stator 30; to further facilitate the air flow backflow effect and reduce air flow loss, in the present embodiment, the backflow wall 52 is fixedly mounted at the end of the stator 30; the outer diameter of the stator 30 is larger than that of the inner shell 42, the backflow wall 52 is in a conical shape, and the width of the backflow seat 51 is larger than that of the inner shell 42, so that a better backflow guiding effect is facilitated; for the convenience of processing and manufacturing, in the present embodiment, the return base 51 and the return wall 52 adopt an integral connection structure;

preferably, in order to achieve convenient and compact installation of the backflow sheet 50, in the present embodiment, the backflow wall 52 is provided with a plurality of spacing notches 52a distributed at intervals, and the end of the stator 30 is provided with a spacing convex tooth (not shown) connected with each spacing notch 52a in a spacing installation manner; of course, in other embodiments, other known processes may be used to achieve the installation and cooperation of the backflow sheet 50 between the stator 30 and the inner housing 42, and the embodiment is not limited only;

preferably, the present embodiment further proposes a mounting structure of the electric blower 1, wherein the stator 30 includes a stator core 31 and a winding 32 mounted on an inner periphery of the stator core 31, and the winding 32 is electrically connected to the controller 60; in the present embodiment, the upper end of the outer casing 41 is installed at the outer periphery of the stator core 31 in a limited manner, specifically, as shown in fig. 3, the inner periphery of the upper end of the outer casing 41 is connected with the outer periphery of the stator core 31 in a limited manner; a circuit board 61 of the controller 60 is fixedly mounted on an end surface of the stator core 31 by a plurality of fasteners (shown, but not labeled);

preferably, in order to achieve a reliable, stable and convenient limit installation effect, please refer to fig. 8 and 9, in this embodiment, the inner periphery of the upper end of the outer shell 41 is provided with 1 or more first limit ribs 41a, the outer periphery of the stator core 31 is provided with a limit groove 31a which is matched with each first limit rib 41a in a limit installation manner, and the stator core 31 is axially and radially limited; the inner periphery of the upper end of the outer shell 41 is provided with 1 or more second limiting ribs 41b, and the second limiting ribs 41b are arranged on the outer periphery of the stator core 31 in a clearance fit manner and used for realizing radial limiting of the stator core 31; further preferably, the number of the first limiting ribs is 2-4, and the first limiting ribs are uniformly distributed on the inner periphery of the upper end of the outer shell 41 at intervals; the number of the second limiting ribs 41b is 4-8, the second limiting ribs 41b are uniformly distributed on the inner periphery of the upper end of the outer shell 41 at intervals, and meanwhile, the second limiting ribs 41b are positioned between the adjacent first limiting ribs 41 a; specifically, in the present embodiment, the number of the first limiting ribs 41a is 3, the number of the second limiting ribs is 4, and the first limiting ribs 41a and the second limiting ribs 41b have the same shape and are uniformly distributed at intervals on the inner periphery of the upper end of the outer housing 41;

further preferably, in the present embodiment, the diffuser blades 43 are located on the inner periphery of the lower end of the outer shell 41, and the

limiting ribs

41a and 41b are respectively and correspondingly connected with the diffuser blades 43 integrally; a step 41c is formed at the joint of each limiting

rib

41a, 41b and the corresponding diffusion blade 43; the mounting strength of the outer case 41 and the inner case 42 can be further improved;

this embodiment is through directly carrying out the structural design that spacing installation cooperation is connected with the 31 periphery of stator core in 41 upper ends of shell body, has ensured the installation reliability to stator 30 structure through simple and easy structure, and the installation is convenient quick moreover, has avoided prior art to adopt stator winding to install respectively inside the casing, and not only the installation is consuming time hard, and the problem of mounting structure reliable and stable inadequately moreover.

Referring to fig. 10, the present embodiment further provides a mounting assembly of a rotor 10 and an impeller 20, including a rotor magnet 12 and an impeller 20 respectively mounted on a rotating shaft 11, wherein a winding 32 is disposed on an outer periphery of the rotor magnet 12 and is electromagnetically coupled thereto; a bearing 13 is fixedly sleeved on the rotating shaft 11 between the rotor magnet 12 and the impeller 20, and an inner shell 42 is relatively rotatably arranged on the outer ring of the bearing 13; meanwhile, a balance weight 14 is arranged at the end part of the rotating shaft 11 close to the rotor magnet 12 and used for reducing the unbalance of the installation assembly;

preferably, in order to further improve the dynamic balance effect, in the present embodiment, the impeller 20 is made of a zinc alloy, an aluminum alloy or a plastic material, and in other embodiments, a high-strength lightweight gold or plastic material may be used, which is not particularly limited in the present embodiment; the balance block is made of metal, and the bearing 13 is made of plastic, so that the installation weight can be further reduced;

preferably, in the present embodiment, the impeller 20 includes an impeller mounting disk 21 fixedly press-fitted on the outer periphery of the rotating shaft 11, and a plurality of blades 22 are arranged on the outer periphery of the impeller mounting disk 21 at intervals; the impeller mounting disc 21 and the blades 22 are integrally formed, so that the impeller 20 is convenient to mount, and vibration or noise is avoided when the impeller 20 rotates at a high speed;

preferably, in the present embodiment, the number of the blades 22 is 10 to 12, and the number of the diffuser blades 43 is 6 to 8; specifically, in the present embodiment, the number of the blades 22 is 12, the number of the diffuser blades 43 is 7, and in practical application, when the rotating speed of the rotating shaft 11 is up to 12 kilo-revolutions per minute, the frequency of the impeller 20 is 22000Hz, noise caused by the frequency cannot be felt by human ears, and a large air flow channel is provided to ensure that high airflow wind pressure is provided;

the present embodiment is composed of a rotor magnet 12 and an impeller 20 respectively fixed on a rotating shaft 11 to form a rotor and impeller mounting assembly, a bearing 13 for mounting is fixedly sleeved on the rotating shaft 11 between the rotor magnet 12 and the impeller 20, and a balance weight 14 is mounted on the end of the rotating shaft 11 near the rotor magnet 12, so that the unbalance problem of the mounting assembly is eliminated or reduced by the structure of the balance weight 14 (specifically, because the impeller 20 is mounted at the lower end of the rotating shaft 11, the mounting weight of the impeller 20 is heavier than the weight at the upper end of the rotating shaft 11, the unbalance vibration problem may occur when the mounting assembly of the rotor 10 and the impeller 20 rotates at high speed).

The present embodiment also proposes a hair dryer comprising an electric blower installed in a hair dryer casing, the electric blower employing the electric blower 1 as described above in the present embodiment.

This embodiment is located stator 30 and impeller 20 with interior casing 42 installation, then install the return flow piece 50 that reduces the air current loss between stator 30 and interior casing 42, return flow piece 50 includes the backward flow seat 51 with interior casing 42 end face contact and upwards extends to the backward flow wall 52 of stator core 31 terminal surface from backward flow seat 51 periphery, through this structural design on the basis that does not increase new installation space, make the air current transmission of electric fan 1 in inside more smooth through this 50 structural design of backward flow piece, the wind pressure is higher, can effectively reduce the inside air current loss problem of shell 41, the air current noise has been reduced when improving work efficiency.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims

1. An electric fan comprises a rotor and an impeller which are integrally installed with a rotating shaft, and a stator which is in electromagnetic coupling connection with the rotor; the rotary shaft is characterized by further comprising an outer shell positioned on the periphery and an inner shell which can be relatively rotatably arranged on the periphery of the rotary shaft, wherein a plurality of diffusion blades are arranged between the outer shell and the inner shell; wherein, the inner casing is located between stator and the impeller, installs the return flow piece that reduces the air current loss simultaneously between stator and inner casing.

2. The electric fan of claim 1, wherein the return plate includes a return seat in contact with an end surface of the inner housing and a return wall extending upwardly from an outer periphery of the return seat to an end surface of the stator.

3. The electric fan of claim 2, wherein the return plate is fixedly mounted to the stator such that an outer diameter thereof is greater than an outer diameter of the inner housing, and the return wall is formed in a tapered shape.

4. The electric fan of claim 2, wherein the return base and the return wall are integrally connected.

5. The electric fan according to claim 2, wherein the return wall is provided with a plurality of spacing notches which are distributed at intervals, and the end part of the stator is provided with a spacing convex tooth which is in spacing installation connection with each spacing notch.

6. The electric fan according to claim 1, wherein the stator comprises a stator core and a winding arranged on the inner periphery of the stator core, the winding is electrically connected with the controller, and the upper end of the outer shell is limitedly arranged on the outer periphery of the stator core.

7. The electric fan according to claim 6, wherein the inner periphery of the upper end of the outer shell is provided with 1 or more first limiting ribs, and the outer periphery of the stator core is provided with limiting grooves which are in limiting installation fit with the first limiting ribs.

8. The electric fan according to claim 7, wherein the inner periphery of the upper end of the outer shell is provided with 1 or more second limiting ribs, and the second limiting ribs are arranged on the outer periphery of the stator core in a clearance fit manner and used for realizing radial limiting of the stator core.

9. The electric fan according to claim 7 or 8, wherein the diffuser blades are located on the inner periphery of the lower end of the outer shell, and the limiting ribs and the diffuser blades are respectively and correspondingly integrally connected.

10. A hair dryer comprising an electric fan mounted in a hair dryer housing, wherein said electric fan is an electric fan as claimed in any one of claims 1 to 9.