A fan and a vacuum cleaner with air duct design

Abstract

The present application provides a fan and a vacuum cleaner with an air duct design, the fan includes a housing, an impeller cover, a guide impeller, a stator assembly and a rotor assembly, the housing includes a hollow mounting column and a plurality of support parts, the plurality of support parts are symmetrically and evenly arranged around the mounting column and fixedly connected thereto, a stator mounting opening extending along the axial direction is provided in a wall region of the mounting column between any adjacent support parts, the stator assembly is mounted in the plurality of stator mounting openings, the axial length of the stator mounting opening is greater than the axial length of the stator core, an air opening is formed to allow air to pass through the air gap between the stator assembly and the rotor assembly through the air opening, and then be discharged through the impeller cover. Through the fan, an opening can be formed between the stator mounting opening and the stator core, so that air can flow through the air gap between the winding surface of the stator core and the rotor assembly and the outer surface of the stator assembly, achieving a good heat dissipation effect.

Description

Technical Field

[0001] The present invention relates to the field of power components, and more specifically, to a fan and a dust collector with an air duct design. Background Art

[0002] In a vacuum cleaner structure, for example, its fan (motor) includes a stator assembly and a rotor assembly. The stator assembly includes at least one stator element such as a stator core and a stator frame, and the rotor assembly includes at least one rotor element such as a rotating shaft and a permanent magnet. The cooling effect on the fan components will directly affect the efficiency, weight and life of the fan. At present, the common cooling method cannot effectively flow through all the parts to be cooled in the fan, limiting its working performance. Summary of the invention

[0003] In response to the above-mentioned problems in the prior art, the present application proposes a fan with an improved air duct design and a vacuum cleaner comprising the fan, which designs an air opening between the stator mounting opening and the stator core so that air can pass through the air gap between the stator assembly and the rotor assembly through the air opening, thereby taking away a large amount of heat and improving the heat dissipation effect.

[0004] In the first aspect, the present application provides a fan with a duct design, comprising a housing, an impeller cover, a guide vane, and a stator assembly and a rotor assembly installed in the housing, the stator assembly being arranged around the rotor assembly, the housing comprising a hollow mounting column and a plurality of support portions, the plurality of support portions being symmetrically and evenly arranged around the mounting column and fixedly connected thereto, a stator mounting opening extending along an axial direction is provided in a wall region of the mounting column between any adjacent support portions, the stator assembly being installed in the plurality of stator mounting openings, wherein in the axial direction of the mounting column, the length of the stator mounting opening is greater than the length of the stator core, an air opening is formed to allow air to pass through the air gap between the stator assembly and the rotor assembly through the air opening, and then be discharged through the impeller cover. Through the fan, an opening can be formed between the stator mounting opening and the stator core, so that air can flow through the air gap between the winding surface of the stator core and the rotor assembly and the outer surface of the stator assembly, thereby achieving a good heat dissipation effect.

[0005] In an embodiment of the first aspect, the support portion is integrally formed with the mounting column, and the stator mounting positioning surfaces on both sides of the stator mounting opening and the rotor bearing mounting positioning surface on the inner wall of the mounting column are coaxially arranged. Through this embodiment, the cumulative error caused by the split design can be reduced, and the relative position accuracy between the stator assembly and the rotor assembly is improved.

[0006] In an embodiment of the first aspect, the inner arc surface of the impeller cover, the stator mounting positioning surfaces on both sides of the stator mounting opening, and the rotor bearing mounting positioning surface on the inner wall of the mounting column are coaxially arranged. Through this embodiment, the relative position accuracy between the impeller cover, the stator assembly, and the rotor assembly can be further improved, and the reliability of the fan operation can be increased.

[0007] In one embodiment of the first aspect, the stator assembly includes a plurality of stator elements uniformly distributed along the circumferential direction, the stator element includes a stator core in a "π" shape, the stator core includes a winding portion and arc-shaped extension portions located on both sides of the winding portion, and the arc surface of the arc-shaped extension portion is in contact with the stator mounting positioning surface on the mounting column.

[0008] In an embodiment of the first aspect, the support portion includes a support portion cavity, and the interior of the support portion cavity is filled with sound-absorbing cotton. Through this embodiment, the noise generated by the mechanical structure can be further reduced, and the user experience can be improved.

[0009] In an embodiment of the first aspect, the support portion includes an integrally formed support surface and support feet located at both ends of the support surface, the support feet are integrally formed with the mounting column, and the support surface, the two support feet and the mounting column surround and form the support portion cavity. With this embodiment, the housing is integrally formed, reducing the cumulative assembly error caused by too many separate components, and further improving the reliability of the fan.

[0010] In an embodiment of the first aspect, the cross section of the support cavity is fan-shaped. Through this embodiment, the volume of the sound-absorbing cotton can be increased and the sound-absorbing effect can be improved.

[0011] In one embodiment of the first aspect, the mounting column has a first bearing mounting seat and a second bearing mounting seat at both ends, and its inner wall is the rotor bearing mounting positioning surface, and the two bearings of the rotor assembly are respectively engaged in the first bearing mounting seat and the second bearing mounting seat through the rotor bearing mounting positioning surface.

[0012] In an embodiment of the first aspect, the housing includes four support portions, and four stator elements are adapted to be installed in the four stator installation openings.

[0013] In a second aspect, the present application further provides a vacuum cleaner, comprising a fan with a fan positioning design as described in the first aspect and any embodiment thereof.

[0014] Compared with the prior art, the fan with fan positioning design and the vacuum cleaner including the fan provided in the present application have the following beneficial effects:

[0015] 1) Form a roughly straight air duct in the fan to improve the cooling effect and extend the life of the fan;

[0016] 2) The housing is integrally formed, which can reduce the cumulative error caused by the split design and the increase in the fan volume and weight;

[0017] 3) Improve the relative position accuracy of the stator assembly and the rotor assembly, reduce the unbalanced magnetic pull and the noise generated by the low relative position accuracy of the stator assembly and the rotor assembly, and improve the efficiency of the motor;

[0018] 4) The design of the silencer cotton can further reduce the noise of the motor and improve the user experience;

[0019] 5) The fan allows the rotor assembly to be installed first, and then the stator assembly to be installed from the outside of the casing, which is convenient for the later inspection and maintenance of the fan.

[0020] The above technical features can be combined in various suitable ways or replaced by equivalent technical features as long as the purpose of the present invention can be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0022] Figure 1 and Figure 2 A perspective view and a side view of a fan according to an embodiment of the present invention are respectively shown;

[0023] Figure 3 and Figure 4 A perspective view and a side view of a housing according to an embodiment of the present invention are respectively shown;

[0024] Figure 5 A schematic diagram of assembling a housing and an impeller cover according to an embodiment of the present invention is shown;

[0025] Figure 6 A schematic structural diagram of a stator element according to an embodiment of the present invention is shown;

[0026] Figure 7 A schematic structural diagram of a stator core according to an embodiment of the present invention is shown;

[0027] Figure 8 The embodiment of the present invention shows Figure 2 A cross-sectional view taken along line AA;

[0028] Fig. 9 A schematic structural diagram of a rotor assembly according to an embodiment of the present invention is shown;

[0029] Fig.10 It shows a schematic structural diagram of the sound-absorbing cotton according to an embodiment of the present invention;

[0030] Fig.11A cross-sectional view showing the air flow direction of a fan according to an embodiment of the present invention is shown.

[0031] In the drawings, the same reference numerals are used for the same components. The drawings are not drawn to scale.

[0032] Reference numerals list:

[0033] 1000-fan; 1100-housing; 1200-stator assembly; 1300-rotor assembly; 1400-impeller cover; 1500-guide vane; 1600-circuit board; 1700-air gap; 1110-mounting column; 1111-stator mounting opening; 1111A-air inlet; 1111B-air outlet; 1112-stator mounting positioning surface; 1113-first bearing mounting seat; 1114-second bearing mounting seat; 1115-rotor bearing mounting positioning surface; 1120-supporting part; 1121-supporting surface; 1122-supporting foot; 1123-supporting part cavity; 1124-silencer cotton; 1125-grid; 1210-stator element; 1211-stator core; 1212-spool; 1 212A-first spool; 1212B-second spool; 1213-winding; 1214-winding portion; 1215A-first toothed portion; 1215B-second toothed portion; 1216A-first arc-shaped extension portion; 1216B-second arc-shaped extension portion; 1216A'-first circular arc surface; 1216B'-second circular arc surface; 1214'-third circular arc surface; 1215A'-fourth circular arc surface; 1215B'-fifth circular arc surface; 1217A-first protrusion; 1217B-second protrusion; 1310-rotating shaft; 1320-permanent magnet; 1330-balance ring; 1340-first bearing; 1350-second bearing; 1360-impeller; 1370-rotor sensor magnet; 1410-inner arc surface. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] Figure 1 1 is a three-dimensional diagram of the fan 1000 provided in this application. Figure 1As shown, the fan 1000 includes a housing 1100, a stator assembly 1200, a rotor assembly 1300, an impeller cover 1400, a guide vane 1500 and a circuit board 1600. The stator assembly 1200 and the rotor assembly 1300 are both installed inside the housing 1100, and the stator assembly 1200 is arranged around the rotor assembly 1300. One end of the main shaft of the rotor assembly 1300 is connected to the circuit board 1600 for arranging circuit elements, and the other end is fixedly connected to the impeller of the rotor assembly 1300 to drive the impeller to rotate. The impeller cover 1400 is fixedly connected to one end of the housing 1100 or is integrally formed and covers the impeller. The guide vane 1500 is fixedly connected to the impeller cover 1400.

[0036] exist Figure 1 and Figure 2 In the embodiment, the housing 1100 contains a stator assembly 1200 and a rotor assembly 1300. Specifically, the housing 1100 includes a hollow mounting column 1110 and a plurality of support portions 1120 arranged around the mounting column 1110. To ensure the structural strength and stability of the wind turbine 1000, the plurality of support portions 1120 are symmetrically and evenly spaced around the mounting column 1110 and are integrally connected with the mounting column 1110 to form a stable support for the central mounting column 1110. A stator mounting opening 1111 is provided in the wall region between any two support portions 1120 of the mounting column 1110 along its axial direction, that is, a plurality of stator mounting openings 1111 are provided on the wall of the mounting column 1110 at equal intervals and symmetrically to accommodate and install a plurality of stator elements 1210 of the stator assembly 1200.

[0037] The mounting post 1110 is preferably a cylindrical or quasi-cylindrical structure.

[0038] Preferably, if Figure 1 As shown, the housing 1100 includes four support portions 1120 , and four stator installation openings 1111 spaced apart and symmetrically distributed are formed between the four support portions 1120 for fitting and installing four stator elements.

[0039] like Figure 6 FIG. 1 is a schematic diagram showing the structure of a stator element 1210 of a stator assembly 1200 of the present invention. Figure 6 As shown, the stator element 1210 includes a stator core 1211, a bobbin 1212 and a winding 1213, wherein the bobbin 1212 (such as Figure 6 As shown, it consists of a first bobbin 1212A and a second bobbin 1212B) which are detachably fixed to the stator core 1211 so that the winding 1213 can form a stator coil around the bobbin 1212 (or the stator core 1211).

[0040] Figure 7Schematic diagram of the structure of the stator core 1211. The stator core 1211 is composed of a winding portion 1214, a first tooth portion 1215A and a second tooth portion 1215B which are parallel to each other to form a "π"-shaped structure. The winding portion 1214 may form a protrusion along the left and right sides or at the rear. In this article, it is preferred that the winding portion 1214 has an arc-shaped structure extending along the left and right sides to form a first arc-shaped extension portion 1216A and a second arc-shaped extension portion 1216B. At least one of the first arc surface 1216A' and the second arc surface 1216B' of the first arc-shaped extension portion 1216A and the second arc surface 1216B has the same radius of curvature as the third arc surface 1214' of the inner side surface of the winding portion between the two. In addition, the wall surfaces on both sides of the stator mounting opening 1111 of the mounting column 1110 (i.e., the stator mounting positioning surface 1112) have the same curvature as the first arc surface and the second arc surface, so that the stator mounting positioning surface 1112 is seamlessly fitted with the first arc surface 1216A' and the second arc surface 1216B', thereby making the fourth arc surface 1215A' and the fifth arc surface 1215B' at the ends of the first tooth portion 1215A and the second tooth portion 1215B maintain a high degree of coaxiality with the rotor permanent magnet (described in detail later) of the rotor assembly 1300, and at the same time, the radial movement of the stator core 1211 toward the permanent magnet can be suppressed. Among them, the ends of the first toothed portion 1215A and the second toothed portion 1215B are respectively provided with a first protrusion 1217A and a second protrusion 1217B, the first protrusion 1217A protrudes from the inner wall of the first toothed portion 1215A toward the second toothed portion 1215B, and the second protrusion 1217B protrudes from the inner wall of the second toothed portion 1215B toward the first toothed portion 1215A.

[0041] like Figure 7 As shown, the distance between the first arc-shaped extension portion 1216A and the first tooth-shaped portion 1215A is d1, and the distance between the second arc-shaped extension portion 1216B and the second tooth-shaped portion 1215B is d2. Preferably, d1 is equal to d2.

[0042] The stator core 1211 has a laminated structure, which is made of electrical silicon steel sheets stacked together using a tooling mold. The sheets can be fixed together by welding or coating with an adhesive.

[0043] Compared with the "C"-shaped core in the prior art whose winding portion includes protrusions, the stator core 1211 of the present invention having the first arc-shaped extension portion 1216A and the first tooth-shaped portion 1215A has a simpler processing technology. At the same time, the setting of the extension portion increases the surface area of ​​the stator core 1211 exposed to the air, which is beneficial to heat dissipation.

[0044] Fig. 91 is a schematic diagram of the structure of the rotor assembly 1300 of the present invention. As shown in the figure, the rotor assembly 1300 includes a rotating shaft 1310, at least one permanent magnet 1320 arranged circumferentially around the rotating shaft 1310, a pair of balancing rings 1330 positioned on both sides of the permanent magnet 1320, a first bearing 1340, a second bearing 1350, and an impeller 1360. The first bearing 1340 and the second bearing 1350 are mounted on the rotating shaft 1310, on both sides of the permanent magnet 1320 and the balancing ring 1330, that is, respectively located on the outside of the pair of balancing rings 1330. The impeller 1360 is fixedly arranged at one end of the rotating shaft 1310, and the rotor sensor magnet 1370 is mounted at the other end of the rotating shaft 1310.

[0045] like Figure 3 and Figure 4 As shown, in the housing 1100, the mounting column 1110 is a hollow structure, and the rotor assembly 1300 is disposed through the mounting column 1110, and the first bearing mounting seat 1113 and the second bearing mounting seat 1114 are disposed at both ends thereof, and the inner wall thereof is an annular rotor bearing mounting positioning surface 1115. When the rotor assembly 1300 is mounted inside the mounting column 1110, the first bearing 1340 is disposed in the first bearing mounting seat 1113 by engaging with the rotor bearing mounting positioning surface 1115, and the second bearing 1350 is disposed in the second bearing mounting seat 1114 by engaging with the rotor bearing mounting positioning surface 1115.

[0046] Here, the connection between the bearing and the corresponding bearing mounting seat can be achieved in a variety of ways, such as adhesive connection, snap connection or bolt connection. In this embodiment, the second bearing mounting seat 1114 is fixedly connected to the second bearing 1350, preferably fixed by adhesive to absorb axial force, thereby preventing axial movement, so that the fan maintains good performance when rotating at high speed, and prolongs the service life of the fan. In this embodiment, the first bearing mounting seat 1113 is flexibly installed with the first bearing 1340, preferably, the inner surface of the first bearing mounting seat 1113 is coated with rubber, so as to effectively withstand and absorb the radial force suffered by the motor during operation.

[0047] refer to Figure 2 and Figure 8In the assembled state, the first tooth-shaped portion 1215A and the second tooth-shaped portion 1215B of the stator element 1211 extend into the stator installation opening 1111, and the first arc surface 1216A' and the second arc surface 1216B' at both ends thereof are seamlessly fitted with the stator installation positioning surfaces 1112 on both sides of the stator installation opening 1111 through, for example, a high temperature resistant adhesive. It should be understood that in this process, the curvature of all the stator installation positioning surfaces 1112 of the mounting column 1110 should be configured to maintain a high degree of coaxiality with the rotor bearing installation positioning surface 1115, so as to reduce the unbalanced magnetic pull caused by the low relative position accuracy of the stator assembly 1200 and the rotor assembly 1300 and the noise generated thereby.

[0048] Furthermore, if Figure 5 As shown, the housing 1100 is fixedly connected or integrally formed with the impeller cover 1400, and the impeller cover 1400 accommodates the impeller of the rotor assembly 1300. The impeller cover is in a frustum shape, with the end with a smaller diameter connected to the housing 1100, and the end with a larger diameter fixedly connected to the impeller 1500. The inner arc surface 1410 of the impeller cover 1400 is a smooth curved surface and maintains a constant gap with the impeller 1360. The inner arc surface 1410 should be constructed to maintain a high degree of coaxiality with the curvature of the stator mounting positioning surface 1112 and the rotor bearing mounting positioning surface 1115 described above, so as to further increase the accuracy of the relative position relationship between the stator assembly 1200 and the rotor assembly 1300.

[0049] In the embodiment provided by the present invention, the support portion 1120 of the mounting post 1110 may be of any shape. Figure 3 and Figure 4 As shown, the support portion 1120 of the mounting column 1110 includes an integrally formed support surface 1121 and support feet 1122 located at both ends of the support surface 1121, wherein the support surface 1121 serves as the outer wall surface of the housing 1100, and the support feet 1122 are integrally connected with the mounting column 1110. In each support portion 1120, the support surface 1121, the two support feet 1122, and the outer wall surface of the mounting column 1110 together surround and form a support portion cavity 1123.

[0050] The housing 1100 is constructed as an integrated structure, which can reduce the cumulative assembly error and the increase in the volume and weight of the fan caused by the split design in the prior art. Optionally, the housing 1100 can be manufactured using a variety of known existing processes, such as casting, 3D printing, and injection molding.

[0051] In the assembled state, the stator element 1210 is disposed in the stator installation opening between adjacent support portions 1120 , and the support legs 1122 can also provide protection for the stator element 1210 therebetween to prevent it from being disturbed and damaged by external equipment.

[0052] Preferably, if Figure 1 and Figure 8 As shown in FIG. 1 , the interior of the support cavity 1123 is filled with a sound-absorbing cotton 1124 (preferably through the high-temperature adhesive), and the structure of the sound-absorbing cotton 1124 is as follows: Fig.10 As shown, in order to absorb the noise generated by the fan. More preferably, the sound-absorbing cotton 1124 penetrates the axial filling of the support cavity.

[0053] Further preferably, the cross-section of the support portion cavity 1123 is fan-shaped, that is, the cross-section of the support portion 1120 is fan-shaped (the fan surface faces outward), so that the support portion 1120 not only provides better protection for the given subassembly 1200, but also increases the volume of the filled sound-absorbing cotton 1124, further enhancing the noise reduction effect of the fan.

[0054] In a preferred embodiment, a grid 1125 is provided at one end of the support cavity 1123 to increase the fixing strength of the sound-absorbing cotton 1124 and increase the noise absorption area of ​​the sound-absorbing cotton 1124 to improve the noise reduction effect. Preferably, the grid 1125 is provided at the bottom end of the support cavity 1123, that is, at one end close to the impeller 1360, because the suction force here is larger, which can better achieve the noise reduction effect.

[0055] In another preferred embodiment, Figure 1 As shown, in the axial direction, the length of the stator installation opening 1111 opened on the installation column 1110 is greater than the length of the stator core 1211 of the stator element installed therein, so that the stator installation opening 1111 has air openings (i.e., air intake port 1111A and air exhaust port 1111B) between its two ends and the stator core 1211. Specifically, as Fig.11As shown by the arrows in , air can enter the air gap 1700 between the stator assembly and the rotor assembly from the air inlet 1111A on the lower side of the stator installation opening 1111 (the air duct in the air gap 1700 is a roughly straight line), leave from the air outlet 1111B on the upper side of the stator installation opening 1111, and then be discharged from the fan through the inner arc surface 1410 of the impeller cover 1400, taking away a large amount of heat in the air gap 1700, reducing the temperature of the stator assembly 1200 and the rotor assembly 1300. And after the stator assembly 1200 is installed, the outer side of the stator element 1210 is directly exposed to the air without any other parts blocking the area. During the operation of the fan, a large amount of wind will flow through the outer surface of the stator assembly and the air gap 1700, so all the heat-generating components inside the fan (mainly the stator assembly 1200 and the rotor assembly 1300) will be fully cooled. At the same time, a small amount of wind also flows through the bearings at both ends of the motor, taking away the heat generated by the bearings.

[0056] The fan with fan positioning design and the vacuum cleaner including the fan provided in the present application can reduce the cumulative error and the increase in motor volume and weight caused by the split design by making the shell one-piece molding; improve the relative position accuracy of the stator assembly and the rotor assembly, reduce the unbalanced magnetic pull caused by the low relative position accuracy of the stator assembly and the rotor assembly and the noise generated thereby, and improve the motor efficiency; the design of the silencer cotton can further reduce the noise of the motor and improve the user experience; form a roughly straight air duct in the fan, improve the cooling effect, and extend the life of the fan; the fan allows the rotor assembly to be installed first, and then the stator assembly is installed from the outside of the shell, which is convenient for the later inspection and maintenance of the fan.

[0057] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0058] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A fan with an air duct design, comprising a housing, an impeller cover, a guide vane, and a stator assembly and a rotor assembly installed in the housing, wherein the stator assembly is arranged around the rotor assembly, and is characterized in that: The shell includes a hollow mounting column and a plurality of supporting parts, wherein the plurality of supporting parts are symmetrically and evenly arranged around the mounting column and fixedly connected thereto, a stator mounting opening extending along the axial direction is provided in a wall region of the mounting column between any adjacent supporting parts, and the stator assembly is mounted in the plurality of stator mounting openings, wherein in the axial direction of the mounting column, the length of the stator mounting opening is greater than the length of the stator core, and an air opening is formed to allow air to pass through the air gap between the stator assembly and the rotor assembly through the air opening, and then be discharged through the impeller cover; the supporting part is integrally formed with the mounting column, and the stator mounting positioning surfaces on both sides of the stator mounting opening and the rotor bearing mounting positioning surface on the inner wall of the mounting column are coaxially arranged; the supporting part includes a supporting part cavity, and the interior of the supporting part cavity is filled with sound-absorbing cotton, and the supporting part includes an integrally formed supporting surface and supporting feet located at both ends of the supporting surface, and the supporting feet are integrally formed with the mounting column, and the supporting surface, the two supporting feet and the mounting column surround the supporting part cavity to form the supporting part cavity.

2. The fan according to claim 1, characterized in that: The inner arc surface of the impeller cover, the stator installation positioning surfaces on both sides of the stator installation opening and the rotor bearing installation positioning surface on the inner wall of the installation column are coaxially arranged.

3. The fan according to claim 1, characterized in that: The stator assembly includes a plurality of stator elements uniformly distributed along the circumferential direction, the stator elements include a "π"-shaped stator core, the stator core includes a winding portion and arc-shaped extension portions located on both sides of the winding portion, and the arc surface of the arc-shaped extension portion fits with the stator mounting positioning surface on the mounting column.

4. The fan according to claim 1, characterized in that: The cross section of the support cavity is fan-shaped.

5. The fan according to claim 1, characterized in that: The mounting column has a first bearing mounting seat and a second bearing mounting seat at both ends, and its inner wall is the rotor bearing mounting positioning surface. The two bearings of the rotor assembly are respectively engaged in the first bearing mounting seat and the second bearing mounting seat through the rotor bearing mounting positioning surface.

6. The fan according to claim 3, characterized in that: The housing includes four supporting portions, and four stator elements are adapted to be installed in the four stator installation openings.

7. A vacuum cleaner, characterized in that: It comprises the fan according to any one of claims 1 to 6.

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