Fan shell and fan

Abstract

The utility model provides a fan shell and a fan. The fan shell comprises a first volute, a second volute and a connecting assembly. An opening of the first volute is opposite to an opening of the second volute; the connecting assembly comprises a plurality of connecting pieces and a plurality of limiting structures, and the connecting pieces are distributed at the opening of the first volute at intervals in the circumferential direction of the first volute and connected with the first volute. At least part of each connecting piece in the plurality of connecting pieces convexly extends to one side, facing the second volute, of the first volute; the multiple limiting structures correspond to the multiple connecting pieces one to one, the multiple limiting structures are distributed at the opening of the second volute at intervals in the circumferential direction of the second volute, and the limiting structures are connected with the corresponding connecting pieces in a clamped mode. According to the fan shell, the connecting strength of the first volute and the second volute can be improved, and the first volute and the second volute are prevented from loosening.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fans, and in particular to a fan casing and a fan. Background Art

[0002] A fan is a kind of air supply mechanism. A fan generally includes a fan housing, an impeller, and a motor. The motor is located in the fan housing and connected to the fan housing. The impeller is located in the fan housing and connected to the output shaft of the motor. When the motor drives the impeller to rotate at high speed, the air outside the fan housing will be sucked into the fan housing, and the air inside the fan housing will be discharged, thereby achieving air supply.

[0003] In the related art, the fan casing is generally a volute structure. The fan casing includes a first volute, a second volute and a plurality of self-tapping screws, and the first volute and the second volute are fixed together by the plurality of self-tapping screws.

[0004] However, since the fan housing is generally made of plastic, after a period of use, the first volute and the second volute may age, so that the connection torque of the self-tapping screws will decrease, resulting in a decrease in the connection strength between the first volute and the second volute, causing the first volute and the second volute to become loose, thereby affecting the use of the fan. Utility Model Content

[0005] The embodiment of the present disclosure provides a fan housing and a fan, which can improve the connection strength between the first volute and the second volute to prevent the two from loosening. The technical solution is as follows:

[0006] An embodiment of the present disclosure provides a fan casing, which includes a first volute, a second volute and a connecting assembly; the opening of the first volute is opposite to the opening of the second volute; the connecting assembly includes a plurality of connecting members and a plurality of limiting structures, the plurality of connecting members are distributed at the opening of the first volute at intervals along the circumference of the first volute, and are all connected to the first volute, and each of the plurality of connecting members at least partially protrudes on the side of the first volute facing the second volute; the plurality of limiting structures correspond one-to-one to the plurality of connecting members, the plurality of limiting structures are distributed at the opening of the second volute at intervals along the circumference of the second volute, and the limiting structures are snap-connected with the corresponding connecting members.

[0007] In another implementation of the present disclosure, the connecting member includes a connecting plate, at least part of the structure of the connecting plate protrudes outside the first volute, the connecting plate has a first connecting surface facing the axis of the second volute, and the first connecting surface has a limiting groove; the limiting structure is at least partially located in the corresponding limiting groove.

[0008] In another implementation of the present disclosure, the limiting groove is a rectangular groove, and the width of the limiting structure in the direction perpendicular to the axis of the second volute is not less than the groove width of the limiting groove.

[0009] In another implementation of the present disclosure, the first connecting surface further has a guiding bevel, and in the axial direction of the first volute, the guiding bevel is located on a side of the limiting groove away from the first volute.

[0010] In another implementation of the present disclosure, the connecting member also includes two positioning strips, which are respectively located on both sides of the connecting plate in the circumferential direction of the first volute, and each of the two positioning strips is connected to the connecting plate; the connecting assembly also includes a plurality of positioning arc strips, which are circumferentially distributed on the edge of the opening of the second volute with the axis of the second volute as the axis, and the plurality of positioning arc strips are connected to the second volute; the plurality of positioning arc strips correspond one-to-one to the plurality of positioning strips, and the positioning strips are offset against the corresponding positioning arc strips, and a limiting structure is arranged between two adjacent positioning arc strips.

[0011] In another implementation of the present disclosure, the first volute has a first positioning stop along the outer peripheral wall on the side facing the second volute; the second volute has a second positioning stop on the inner peripheral wall on the side facing the first volute, and the first positioning stop is snap-fitted with the second positioning stop.

[0012] In another implementation of the present disclosure, the connecting member and the first volute are integrally injection-molded structural members; the limiting structure, the positioning arc strip and the second volute are integrally injection-molded structural members.

[0013] In another implementation of the present disclosure, the side wall of the first volute has a first notch, and the side wall of the second volute has a second notch, and the first notch and the second notch form an exhaust port; the connecting assembly also includes a connector, which is located on one side of the first notch and on the edge of the opening of the first volute, and the connector is connected to the first volute; the opening edge of the second volute has a connector slot arranged corresponding to the connector, and the connector is located in the connector slot and is clamped in the connector slot.

[0014] In another implementation of the present disclosure, the connector includes a first plug-in block and a second plug-in block, and the first plug-in block and the second plug-in block are respectively located on both sides of the first notch; the plug-in slot includes a first plug-in slot and a second plug-in slot, and the first plug-in slot and the second plug-in slot are respectively located on both sides of the second notch, the first plug-in block is clamped in the first plug-in slot, and the second plug-in block is clamped in the second plug-in slot.

[0015] In another implementation of the present disclosure, a fan is also provided, which includes a fan housing, a motor and an impeller, wherein the motor and the impeller are respectively located in the fan housing and are respectively connected to the fan housing, the motor and the impeller are connected, and the fan housing is the fan housing described above.

[0016] The technical solution provided by the embodiments of the present disclosure brings the following beneficial effects:

[0017] Since the connecting component includes a connecting piece and a limiting structure, the connecting piece is connected to the first volute, and the limiting structure is connected to the second volute, and the limiting structure is clamped with the corresponding connecting piece, the first volute and the second volute can be directly matched through the connecting piece and the limiting structure during assembly, so that the limiting structure is clamped in the connecting piece to achieve the connection between the first volute and the second volute, so that the first volute and the second volute are clamped together for easy disassembly, and the problem of screw detachment due to aging of the first volute and the second volute can also be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structure of a fan housing provided in an embodiment of the present disclosure;

[0020] Figure 2 for Figure 1 an exploded view along a first direction;

[0021] Figure 3 is a structural schematic diagram of the first volute;

[0022] Figure 4 for Figure 1 an exploded view along a second direction;

[0023] Figure 5 is a structural schematic diagram of the second volute;

[0024] Figure 6 A schematic diagram of the structure of a fan provided in an embodiment of the present disclosure.

[0025] The symbols in the figure mean the following:

[0026] 1. first volute; 10. exhaust port; 11. first arc-shaped cover; 12. first connecting plate; 13. second connecting plate; 110. first notch; 14. connecting block; 100. first positioning stop;

[0027] 2. second volute; 21. second arc-shaped cover; 22. third connecting plate; 23. fourth connecting plate; 24. mesh cover; 210. second notch; 200. second positioning stop; 20. plug-in slot; 201. first plug-in slot; 202. second plug-in slot;

[0028] 3. Connecting assembly; 31. Connecting piece; 311. Connecting plate; 310. Limiting groove; 3100. Guide slope; 312. Positioning card strip; 32. Limiting structure; 33. Positioning arc strip; 35. Connecting piece; 351. First plug-in block; 352. Second plug-in block;

[0029] 4. Motor; 5. Impeller. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0031] The embodiment of the present disclosure provides a fan housing, such as Figure 1 As shown, the fan housing includes a first volute 1, a second volute 2 and a connecting assembly 3. The opening of the first volute 1 is opposite to the opening of the second volute 2, and the first volute 1 and the second volute 2 together form an exhaust port 10, which is connected to the space defined by the first volute 1 and the second volute 2.

[0032] Figure 2 for Figure 1 Exploded view along the first direction, combined with Figure 2 The connection assembly 3 includes a plurality of connection members 31 and a plurality of limiting structures 32. The plurality of connection members 31 are distributed at the opening of the first volute 1 at intervals along the circumference of the first volute 1 and are all connected to the first volute 1. Each of the plurality of connection members 31 at least partially protrudes from the side of the first volute 1 facing the second volute 2.

[0033] The plurality of limiting structures 32 correspond to the plurality of connecting members 31 one by one. The plurality of limiting structures 32 are distributed at the opening of the second volute 2 at intervals along the circumference of the second volute 2 and are connected to the second volute 2 . The limiting structures 32 are snap-fitted with the corresponding connecting members 31 .

[0034] Since the fan casing provided by the embodiment of the present disclosure includes a first volute 1 and a second volute 2, the first volute 1 and the second volute 2 can be docked together to assemble structures such as a motor and an impeller in a limited space.

[0035] Furthermore, since the connecting component 3 includes a connecting piece 31 and a limiting structure 32, the connecting piece 31 is connected to the first volute 1, and the limiting structure 32 is connected to the second volute 2 and is snap-fitted with the corresponding connecting piece 31. In this way, when the first volute 1 and the second volute 2 are assembled, the connecting piece 31 and the limiting structure 32 can be directly matched to make the limiting structure 32 and the connecting piece 31 snap-fitted together to achieve the connection between the first volute 1 and the second volute 2, so that the first volute 1 and the second volute 2 are snap-fitted together, which is convenient for disassembly. At the same time, it can also avoid the problem of loose screw connection due to aging of the first volute 1 and the second volute 2.

[0036] Exemplarily, the first volute 1 includes a first arc-shaped cover body 11, a first connecting plate 12 and a second connecting plate 13, the first connecting plate 12 and the second connecting plate 13 are respectively located on both sides of the first arc-shaped cover body 11 in the arc length direction, and the first connecting plate 12 and the second connecting plate 13 are both tangent to and connected to the outer arc surface of the first arc-shaped cover body 11. A first notch 110 is formed between the first connecting plate 12 and the second connecting plate 13. A plurality of connecting members 31 are spaced apart and distributed on the arc surface of the first arc-shaped cover body 11 along the arc length direction of the first arc-shaped cover body 11.

[0037] The second volute 2 includes a second arc-shaped cover body 21, a third connecting plate 22 and a fourth connecting plate 23, the third connecting plate 22 and the fourth connecting plate 23 are respectively located on both sides of the second arc-shaped cover body 21 in the arc length direction, and the third connecting plate 22 and the fourth connecting plate 23 are tangent to and connected with the outer arc surface of the second arc-shaped cover body 21. A second notch 210 is formed between the second arc-shaped cover bodies 21. A plurality of limiting structures 32 are spaced apart along the arc length direction of the second arc-shaped cover body 21 on the arc surface of the second arc-shaped cover body 21 on one side facing the first arc-shaped cover body 11.

[0038] When the first volute 1 and the second volute 2 are assembled together, the first arc-shaped cover 11 is connected to the second arc-shaped cover 21, the first connecting plate 12 is connected to the third connecting plate 22, and the second connecting plate 13 is connected to the fourth connecting plate 23. An exhaust port 10 is formed between the first notch 110 and the second notch 210. It can be seen that the above structure can facilitate the assembly of the two and form the exhaust port 10 at the same time.

[0039] Exemplarily, a plurality of connection blocks 14 for connecting with the motor are connected to one side of the first arc-shaped cover body 11 away from the second arc-shaped cover body 21. A mesh cover 24 is connected to one side of the second arc-shaped cover body 21 away from the first arc-shaped cover body 11.

[0040] Figure 3 is a schematic diagram of the structure of the first volute, combined with Figure 3 Optionally, the connecting member 31 includes a connecting plate 311 , and at least a portion of the connecting plate 311 protrudes outside the first volute 1 .

[0041] The connecting plate 311 has a first connecting surface facing the axis of the second volute 2 , and the first connecting surface has a limiting groove 310 . The limiting structure 32 is at least partially located in the corresponding limiting groove 310 .

[0042] In the above implementation, the connecting plate 311 can not only be simply arranged outside the first volute 1 so that its part protrudes outside the first volute 1 , but also can conveniently form a limiting groove 310 so that the limiting structure 32 can be snapped into the limiting groove 310 .

[0043] In other examples, the connecting plate 311 may also be other structures, which are not limited in the present disclosure, such as a rod, etc. However, compared with the connecting plate, the connecting plate has a relatively smaller connection area with the first volute 1, which may cause the two to fall off.

[0044] In this embodiment, the connecting plate 311 is a wedge-shaped structure, and the projection area of ​​the connecting plate 311 on the first volute 1 gradually decreases radially outward from the first volute 1. This can reduce the space occupied by the connecting plate 311 and avoid interference with other components.

[0045] Combination Figure 2 and Figure 3 Optionally, the limiting groove 310 is a rectangular groove, the limiting structure 32 is a rectangular parallelepiped injection molded structural member, and the width of the limiting structure 32 along the axial direction perpendicular to the second volute 2 is not less than the groove width of the limiting groove 310.

[0046] In the above implementation, the limiting groove 310 is set as a rectangular groove, and the limiting structure 32 is set as a rectangular injection molded structure. In this way, the rectangular limiting groove 310 can be matched with the rectangular limiting structure 32 so that the limiting structure 32 can be stuck in the limiting groove 310.

[0047] Of course, the limiting groove 310 may also be in other shapes, such as a triangle, a trapezoid, etc. Correspondingly, the limiting structure 32 may also be in a triangle, a trapezoid, etc. As long as the limiting structure 32 can be stuck in the limiting groove 310, the present disclosure does not limit this.

[0048] Optionally, the first connecting surface also has a guide bevel 3100. In the axial direction of the first volute 1, the guide bevel 3100 is located on the side of the limiting groove 310 away from the first volute 1. In the direction from the second volute 2 to the first volute 1, the distance between the guide bevel 3100 and the axis of the first volute 1 gradually decreases.

[0049] When the first volute 1 and the second volute 2 are docked together, the existence of the guide slope 3100 can guide the movement of the limiting structure 32, so that the limiting structure 32 can smoothly slide into the limiting groove 310 along the extension of the guide slope 3100, so as to be clamped together with the limiting groove 310.

[0050] Furthermore, when the first volute 1 and the second volute 2 are disassembled, a tool may be directly inserted between the guiding inclined surface 3100 and the second volute 2 to disengage the limiting structure 32 from the limiting groove 310 .

[0051] Figure 4 for Figure 1 Exploded view along the second direction, combined with Figure 4 Optionally, the connecting member 31 further includes two positioning strips 312 , which are respectively located on both sides of the connecting plate 311 in the circumferential direction of the first volute 1 , and each of the two positioning strips 312 is respectively connected to the connecting plate 311 .

[0052] The connecting assembly 3 further comprises a plurality of positioning arc strips 33 , which are circumferentially spaced and distributed on the edge of the opening of the second volute 2 with the axis of the second volute 2 as the axis, and the plurality of positioning arc strips 33 are connected to the second volute 2 .

[0053] The plurality of positioning arc strips 33 correspond to the plurality of positioning clamping strips 312 one by one, and the positioning clamping strips 312 abut against the corresponding positioning arc strips 33. A limiting structure 32 is arranged between two adjacent positioning arc strips 33.

[0054] In the above implementation, the positioning clip strip 312 is used to cooperate with the positioning arc strip 33, so that the first volute 1 and the second volute 2 can be quickly positioned when they are docked together.

[0055] That is to say, when the first volute 1 and the second volute 2 are docked, the first volute 1 and the second volute 2 are moved so that the first volute 1 and the second volute 2 are brought closer to each other until the positioning clamping strip 312 and the positioning arc strip 33 are clamped together, and the limiting structure 32 is pressed into the limiting groove 310. In addition, the connecting plate 311 is arranged in the middle of the positioning clamping strip 312, so that when each limiting structure 32 is inserted into the limiting groove 310 in the connecting plate 311, the positioning arc strips 33 and the positioning arc strips 33 corresponding to the two sides of the limiting structure 32 can be offset, which can further increase the positioning effect between the first volute 1 and the second volute 2.

[0056] See again Figure 3 Optionally, the outer peripheral wall of the first volute 1 facing the second volute 2 has a first positioning stop 100.

[0057] Figure 5 is a schematic diagram of the structure of the second volute, combined with Figure 5 The inner wall of the second volute 2 facing the first volute 1 has a second positioning stop 200 , and the second positioning stop 200 is located outside the first positioning stop 100 , and the first positioning stop 100 is engaged with the second positioning stop 200 .

[0058] The first positioning stop 100 and the second positioning stop 200 cooperate with each other, and can further enable the first volute 1 and the second volute 2 to be quickly positioned.

[0059] In this embodiment, a side surface of the positioning clip 312 facing the second volute 2 is a groove wall of the first positioning stop 100 .

[0060] In this way, the first volute 1 and the second volute 2 can be quickly positioned by simultaneously cooperating the positioning clamping strip 312 with the positioning arc strip 33 , and the first positioning stop 100 with the second positioning stop 200 .

[0061] Exemplarily, the connecting member 31 and the first volute 1 are integrally formed injection-molded structural members, and the limiting structure 32, the positioning arc strip 33 and the second volute 2 are integrally formed injection-molded structural members. This can improve processing efficiency.

[0062] See again Figure 3 and Figure 5 Optionally, the connection assembly 3 further includes a plug-in connector 35 , which is located at one side of the first notch 110 and on the edge of the opening of the first volute 1 . The plug-in connector 35 is connected to the first volute 1 .

[0063] An inserting groove 20 arranged corresponding to the inserting component 35 is provided on the edge of the opening of the second volute 2 . The inserting component 35 is located in the inserting groove 20 and is clamped in the inserting groove 20 .

[0064] Since the first connecting plate 12, the second connecting plate 13, the third connecting plate 22 and the fourth connecting plate 23 are arranged at the air outlet 10, it is inconvenient to arrange the connecting member 31 and the limiting structure 32. However, in order to further increase the connection strength between the first volute 1 and the second volute 2 at the air outlet 10, the plug-in member 35 and the plug-in slot 20 are arranged at the air outlet 10, so that the connection strength between the first volute 1 and the second volute 2 can be further increased.

[0065] In this embodiment, the plug-in connector 35 includes a first plug-in block 351 and a second plug-in block 352, and the first plug-in block 351 and the second plug-in block 352 are respectively located on both sides of the first notch 110, wherein the first plug-in block 351 is connected to the first connecting plate 12, and the second plug-in block 352 is connected to the second connecting plate 13. Correspondingly, the plug-in slot 20 includes a first plug-in slot 201 and a second plug-in slot 202, and the first plug-in slot 201 and the second plug-in slot 202 are respectively located on both sides of the second notch 210. The first plug-in slot 201 is located on the third connecting plate 22, and the second plug-in slot 202 is located on the fourth connecting plate 23. Among them, the first plug-in slot 201 and the second plug-in slot 202 are through slots that pass through the axial ends of the second volute 2. The first plug-in block 351 is clamped in the first plug-in slot 201 and abuts against the third connecting plate 22. The second plug-in block 352 is clamped in the second plug-in slot 202. In this way, the connection strength between the first volute 1 and the second volute 2 can be further improved.

[0066] Exemplarily, the end of the first plug-in block 351 away from the first volute 1 is a triangular wedge structure, which can facilitate the insertion of the first plug-in block 351 into the first plug-in slot 201. The end of the second plug-in block 352 away from the first volute 1 is also a triangular wedge structure, and correspondingly, the second plug-in slot 202 is a bevel slot, which can facilitate the positioning and assembly of the two.

[0067] On the other hand, the present disclosure also provides a fan, such as Figure 6 As shown, the fan includes a fan housing, a motor 4 and an impeller 5. The motor 4 and the impeller 5 are respectively located in the fan housing and are respectively connected to the fan housing. The motor 4 and the impeller 5 are connected. The fan housing is the fan housing mentioned above.

[0068] The above fans have the same beneficial effects as the above fan housings, which will not be described in detail here.

[0069] The above are only optional embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A fan housing, characterized in that: The fan casing comprises a first volute (1), a second volute (2) and a connecting assembly (3); The opening of the first volute (1) and the opening of the second volute (2) are opposite to each other; The connecting assembly (3) comprises a plurality of connecting members (31) and a plurality of limiting structures (32), wherein the plurality of connecting members (31) are distributed at intervals along the circumference of the first volute (1) at the opening of the first volute (1) and are all connected to the first volute (1), and each of the plurality of connecting members (31) at least partially protrudes from a side of the first volute (1) facing the second volute (2); The plurality of limiting structures (32) correspond one to one with the plurality of connecting members (31); the plurality of limiting structures (32) are distributed at the opening of the second volute (2) at intervals along the circumference of the second volute (2); and the limiting structures (32) are snap-connected with the corresponding connecting members (31).

2. The fan housing according to claim 1, characterized in that: The connecting member (31) comprises a connecting plate (311), at least part of the structure of the connecting plate (311) protrudes outside the first volute (1), the connecting plate (311) has a first connecting surface facing the axis of the second volute (2), and the first connecting surface has a limiting groove (310); The limiting structure (32) is at least partially located in the corresponding limiting groove (310).

3. The fan housing according to claim 2, characterized in that: The limiting groove (310) is a rectangular groove, and along the axial direction perpendicular to the second volute (2), the width of the limiting structure (32) is not less than the groove width of the limiting groove (310).

4. The fan housing according to claim 2, characterized in that: The first connecting surface also has a guiding bevel (3100), and in the axial direction of the first volute (1), the guiding bevel (3100) is located on a side of the limiting groove (310) away from the first volute (1).

5. The fan housing according to claim 2, characterized in that: The connecting member (31) further comprises two positioning clips (312), wherein the two positioning clips (312) are respectively located on two sides of the connecting plate (311) in the circumferential direction of the first volute (1), and each of the two positioning clips (312) is connected to the connecting plate (311); The connecting assembly (3) further comprises a plurality of positioning arc strips (33), wherein the plurality of positioning arc strips (33) are circumferentially spaced and distributed on the edge of the opening of the second volute (2) with the axis of the second volute (2) as the axis, and the plurality of positioning arc strips (33) are connected to the second volute (2); The plurality of positioning arc strips (33) correspond one to one with the plurality of positioning clamping strips (312), and the positioning clamping strips (312) abut against the corresponding positioning arc strips (33), and a limiting structure (32) is arranged between two adjacent positioning arc strips (33).

6. The fan housing according to claim 5, characterized in that: The connecting member (31) and the first volute (1) are an injection-molded structural member that is integrally injection-molded; The limiting structure (32), the positioning arc strip (33) and the second volute (2) are integrally injection-molded structural parts.

7. The fan housing according to any one of claims 1 to 6, characterized in that: The outer peripheral wall of the first volute (1) on the side facing the second volute (2) has a first positioning stop (100); The inner peripheral wall of the second volute (2) on the side facing the first volute (1) has a second positioning stop (200), and the first positioning stop (100) is engaged with the second positioning stop (200).

8. The fan housing according to any one of claims 1 to 6, characterized in that: The side wall of the first volute (1) has a first notch (110), the side wall of the second volute (2) has a second notch (210), and the first notch (110) and the second notch (210) form an air outlet (10); The connecting assembly (3) further comprises a plug-in connector (35), wherein the plug-in connector (35) is located on one side of the first notch (110) and at the edge of the opening of the first volute (1), and the plug-in connector (35) is connected to the first volute (1); The opening edge of the second volute (2) is provided with a plug-in slot (20) arranged corresponding to the plug-in component (35); the plug-in component (35) is located in the plug-in slot (20) and is clamped in the plug-in slot (20).

9. The fan housing according to claim 8, characterized in that: The plug-in connector (35) comprises a first plug-in block (351) and a second plug-in block (352), wherein the first plug-in block (351) and the second plug-in block (352) are respectively located on two sides of the first notch (110); The plug-in slot (20) comprises a first plug-in slot (201) and a second plug-in slot (202); the first plug-in slot (201) and the second plug-in slot (202) are respectively located on two sides of the second notch (210); the first plug-in block (351) is clamped in the first plug-in slot (201); and the second plug-in block (352) is clamped in the second plug-in slot (202).

10. A fan, characterized in that: The fan includes a fan housing, a motor and an impeller, wherein the motor and the impeller are respectively located in the fan housing and are respectively connected to the fan housing, the motor and the impeller are connected, and the fan housing is the fan housing described in any one of claims 1-9.

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