Inner rotor volute fan

Abstract

The utility model discloses an inner rotor volute fan which comprises a fan shell in a volute shape and a movable impeller located in the fan shell, an air inlet communicated with the movable impeller is formed in the bottom of the fan shell, and a lower bearing seat is arranged on the upper portion of the fan shell. The lower end part of the motor shaft is mounted on the lower bearing seat in a relatively rotating manner, penetrates through the lower bearing seat, downwards extends into the fan shell and is fixedly mounted and connected with the movable impeller; the upper end part of the motor shaft is mounted on the motor end cover in a relatively rotating manner; the periphery of the motor shaft is fixedly sleeved with a rotor assembly, and the periphery of the rotor assembly is sleeved with a stator assembly in a clearance fit mode. The stator assembly is fixedly installed between the motor end cover and the fan shell. The volute fan is simple in mounting structure and easy to assemble, the motor shaft is directly sleeved with the magnetic ring sleeve, in the high-speed rotating working process, the unbalance amount is decreased, noise can be obviously reduced, and the working efficiency of the volute fan is improved.

Description

Technical Field

[0001] The utility model belongs to the field of fan structures, and in particular relates to an inner rotor volute fan. Background Art

[0002] Existing volute fans basically all use an external rotor motor structure (whose outer diameter is greater than or equal to 65mm), resulting in a large outer diameter of the volute fan (the outer diameter of the volute is usually 76mm), a large imbalance and noise problems, resulting in the inability to achieve very high motor speeds and thus unable to meet higher fan performance requirements; at the same time, the large size of the motor will also seriously affect the spatial layout of the entire sweeper.

[0003] Therefore, the applicant hopes to seek technical solutions to solve the above technical problems. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an inner rotor volute blower, which not only has a simple installation structure and is easy to assemble, but also the magnetic ring sleeve is directly mounted on the motor shaft. During high-speed rotation, the imbalance amount becomes smaller and the noise is significantly reduced, thereby improving the working efficiency of the volute blower.

[0005] The technical solutions adopted in this utility model are as follows:

[0006] An inner rotor volute fan comprises a volute-shaped fan casing and a moving impeller located inside the fan casing, an air inlet connected to the moving impeller is provided at the bottom of the fan casing, and a lower bearing seat is provided at the upper portion of the fan casing;

[0007] The lower end portion of the motor shaft is relatively rotatably mounted on the lower bearing seat and extends downward through the lower bearing seat into the interior of the fan housing to be fixedly mounted and connected to the impeller;

[0008] The upper end portion of the motor shaft is relatively rotatably mounted on the motor end cover;

[0009] The outer periphery of the motor shaft is fixedly sleeved with a rotor assembly, and the outer periphery of the rotor assembly is sleeved with a stator assembly in a clearance-matched manner;

[0010] The stator assembly is fixedly installed between the motor end cover and the fan casing.

[0011] Preferably, the motor end cover is provided with a plurality of through-mounting holes distributed at circumferential intervals;

[0012] The outer periphery of the subassembly is provided with a plurality of circumferentially spaced fastening grooves; the upper part of the fan casing is provided with a plurality of circumferentially spaced fastening mounting bosses; and a plurality of fasteners are used to fasten and install the through mounting holes, the fastening grooves and the fastening mounting bosses one by one.

[0013] Preferably, the motor end cover comprises an upper bearing seat located on the inner periphery and a plurality of end cover brackets extending integrally from the outer periphery of the upper bearing seat and distributed at intervals in the circumferential direction;

[0014] The upper end portion of the motor shaft is relatively rotatably mounted on the upper bearing seat;

[0015] Each end cover bracket is in an arc-shaped bending shape and is correspondingly provided with the through mounting hole.

[0016] Preferably, a heat dissipation protection plate is fixedly sleeved on the outer periphery of the stator assembly; wherein,

[0017] The heat dissipation protection plate is located above the fan casing;

[0018] The upper part of the fan casing is provided with a plurality of protective plate mounting bosses which are distributed at intervals in the circumferential direction; the heat dissipation protective plate is fastened and mounted to the protective plate mounting bosses by fasteners.

[0019] Preferably, the outer periphery of the stator assembly is provided with a plurality of protrusions distributed at intervals, and a fastening groove is provided in each protrusion; the inner periphery of the heat dissipation protection plate is provided with a limiting groove that cooperates with each protrusion.

[0020] Preferably, the height of the protective plate mounting boss is smaller than the height of the fastening mounting boss.

[0021] Preferably, the fan casing comprises an upper fan casing unit and a lower fan casing unit installed as one body, wherein the lower fan casing unit is provided with an air inlet connected to the impeller; and the upper fan casing unit is provided with the lower bearing seat.

[0022] Preferably, the lower end of the motor shaft is relatively rotatably mounted on the lower bearing seat via a lower bearing; and the upper end of the motor shaft is relatively rotatably mounted on the motor end cover via an upper bearing.

[0023] Preferably, the stator core of the stator assembly adopts a 6-slot structure, and the magnetic ring of the rotor assembly adopts a 4-pole structure.

[0024] Preferably, the outer diameter of the fan casing is in the range of 65-70 mm, which refers to the outer diameter value of the circular part of the fan casing.

[0025] The present application proposes a volute fan scheme that adopts an inner rotor motor structure (specifically: a rotor assembly (i.e., a magnetic ring sleeve) is fixedly mounted on the outer periphery of the motor shaft, and a stator assembly is fitted in a clearance-matched manner on the outer periphery of the rotor assembly), wherein the upper end portion of the motor shaft is relatively rotatably mounted on the motor end cover, and the stator assembly is fixedly mounted between the motor end cover and the fan casing; not only is the mounting structure simple and easy to assemble, but the present application also directly mounts the magnetic ring sleeve on the motor shaft, and during high-speed rotation operation, the imbalance amount becomes smaller and the noise is significantly reduced, thereby improving the working efficiency of the volute fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the external structure of the inner rotor volute fan according to a specific embodiment of the present invention;

[0027] Figure 2 This is a schematic top view of the structure of the inner rotor volute fan according to a specific embodiment of the present invention;

[0028] Figure 3 yes Figure 2 Cross-sectional view in the AA direction;

[0029] Figure 4 It is a schematic diagram of the exploded structure of the inner rotor volute fan according to a specific embodiment of the present invention. DETAILED DESCRIPTION

[0030] An embodiment of the present utility model discloses an inner rotor volute fan, comprising a fan casing in the shape of a volute and a moving impeller located inside the fan casing, an air inlet connected to the moving impeller being provided at the bottom of the fan casing, and a lower bearing seat being provided at the upper portion of the fan casing; the lower end portion of the motor shaft is relatively rotatably mounted on the lower bearing seat and passes through the lower bearing seat to extend downward into the interior of the fan casing and fixedly mounted and connected to the moving impeller; the upper end portion of the motor shaft is relatively rotatably mounted on the motor end cover; the outer periphery of the motor shaft is fixedly sleeved with a rotor assembly, and the outer periphery of the rotor assembly is gap-fittedly sleeved with a stator assembly; the stator assembly is fixedly mounted between the motor end cover and the fan casing.

[0031] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0032] See Figure 1 、 Figure 2 、 Figure 3Combined with Figure 4 As shown, an inner rotor volute fan comprises a fan casing 1 in the shape of a volute and a moving impeller 2 located inside the fan casing 1. An air inlet 3 communicating with the moving impeller 2 is provided at the bottom of the fan casing 1, and a lower bearing seat 1a is provided at the upper portion of the fan casing 1; the lower end portion of the motor shaft 5 is relatively rotatably mounted on the lower bearing seat 1a and extends downward through the lower bearing seat 1a into the interior of the fan casing 1 and is fixedly mounted and connected to the moving impeller 2; the upper end portion of the motor shaft 5 is relatively rotatably mounted on the motor end cover 6; a rotor assembly 7 (specifically, a rotor assembly 7) is fixedly sleeved on the outer periphery of the motor shaft 5. The stator assembly 8 is mounted on the outer periphery of the rotor assembly 7 with a matching clearance; the stator assembly 8 is fixedly installed between the motor end cover 6 and the fan casing 1; preferably, in this embodiment, the stator core of the stator assembly 8 adopts a 6-slot structure, and the magnetic ring of the rotor assembly 7 adopts a 4-pole structure; the outer diameter of the fan casing 1 ranges from 65 to 70 mm; specifically preferably, in this embodiment, the outer diameter of the fan casing 1 is 66 mm. The smaller fan casing 1 and impeller 2 structure enable the impeller 2 to have greater performance advantages in dynamic balancing trimming and vibration and noise control;

[0033] Preferably, in this embodiment, the fan casing 1 includes an upper fan casing unit 11 and a lower fan casing unit 12 installed as one body, wherein the lower fan casing unit 11 is provided with an air inlet 3 connected to the impeller 2; the upper fan casing unit 11 is provided with a lower bearing seat 1a; further preferably, in this embodiment, the lower end portion of the motor shaft 5 is relatively rotatably mounted on the lower bearing seat 1a through a lower bearing 9a; the upper end portion of the motor shaft 5 is relatively rotatably mounted on the motor end cover 6 through an upper bearing 9b.

[0034] Preferably, in order to ensure the fastening and installation effect, in this embodiment, the motor end cover 6 is provided with a plurality of through-mounting holes 61 distributed at circumferential intervals (this embodiment specifically provides 3 through-mounting holes 61); the outer periphery of the stator assembly 8 is provided with a plurality of fastening grooves 81 distributed at circumferential intervals (this embodiment specifically provides 3 fastening grooves 81); the upper part of the fan casing 1 is provided with a plurality of fastening mounting bosses 11 distributed at circumferential intervals (this embodiment specifically provides 3 fastening mounting bosses 11); and a plurality of fasteners 9c are used to fasten and install the through-mounting holes 61, the fastening grooves 81 and the fastening mounting bosses 11 one by one.

[0035] Preferably, in this embodiment, the motor end cover 6 includes an upper bearing seat 6a located on the inner periphery and a plurality of end cover brackets 6b extending integrally from the outer periphery of the upper bearing seat 6a and distributed at circumferential intervals; the upper end portion of the motor shaft 5 is relatively rotatably mounted on the upper bearing seat 6a; each end cover bracket 6b is arc-shaped and has a corresponding through-mounting hole 61.

[0036] Preferably, in order to achieve the heat dissipation and protection effect of the motor, in this embodiment, the outer periphery of the stator assembly 8 is also fixedly sleeved with a heat dissipation protective plate 9; wherein, the heat dissipation protective plate 9 (made of metal) is located above the fan casing 1; the upper part of the fan casing 1 is provided with a plurality of protective plate mounting bosses 12 distributed at circumferential intervals (in this embodiment, three protective plate mounting bosses 12 are specifically provided); the heat dissipation protective plate 9 is fastened and mounted to the protective plate mounting bosses 12 by fasteners 9d; further preferably, in this embodiment, the outer periphery of the stator assembly 8 is provided with a plurality of protrusions 8a distributed at intervals, and each protrusion 8a is provided with a fastening groove 81; the inner periphery of the heat dissipation protective plate 9 is provided with a limiting groove 91 that cooperates with each protrusion 8a; preferably, in this embodiment, the height of the protective plate mounting boss 12 is less than the height of the fastening mounting boss 11.

[0037] This embodiment proposes a volute fan solution using an inner rotor motor structure (specifically, a rotor assembly 7 (i.e., a magnetic ring sleeve) is fixedly mounted on the outer periphery of the motor shaft 5, and a stator assembly 8 is mounted on the outer periphery of the rotor assembly 7 with a clearance fit). The upper end of the motor shaft 5 is relatively rotatably mounted on the motor end cover 6, and the stator assembly 8 is fixedly mounted between the motor end cover 6 and the fan casing 1. Not only is the mounting structure simple and easy to assemble, but in this embodiment, the magnetic ring sleeve 7 is directly mounted on the motor shaft 5. During high-speed rotation, the imbalance is reduced and the noise is significantly reduced, thereby improving the operating efficiency of the volute fan.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method includes only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An inner rotor volute fan, comprising a volute-shaped fan casing and a moving impeller located inside the fan casing, characterized in that: The bottom of the fan housing is provided with an air inlet connected to the impeller, and the upper part of the fan housing is provided with a lower bearing seat; The lower end portion of the motor shaft is relatively rotatably mounted on the lower bearing seat and extends downward through the lower bearing seat into the interior of the fan housing to be fixedly mounted and connected to the impeller; The upper end portion of the motor shaft is relatively rotatably mounted on the motor end cover; The outer periphery of the motor shaft is fixedly sleeved with a rotor assembly, and the outer periphery of the rotor assembly is sleeved with a stator assembly in a clearance-matched manner; The stator assembly is fixedly installed between the motor end cover and the fan casing.

2. The inner rotor volute blower according to claim 1, characterized in that: The motor end cover is provided with a plurality of through-mounting holes distributed at circumferential intervals; the outer periphery of the stator assembly is provided with a plurality of fastening grooves distributed at circumferential intervals; the upper part of the fan casing is provided with a plurality of fastening mounting bosses distributed at circumferential intervals; and a plurality of fasteners are used to fasten and install the through-mounting holes, the fastening grooves and the fastening mounting bosses one by one.

3. The inner rotor volute blower according to claim 2, characterized in that: The motor end cover comprises an upper bearing seat located on the inner periphery and a plurality of end cover brackets extending integrally from the outer periphery of the upper bearing seat and distributed at intervals in the circumferential direction; The upper end portion of the motor shaft is relatively rotatably mounted on the upper bearing seat; Each end cover bracket is in an arc-shaped bending shape and is correspondingly provided with the through mounting hole.

4. The inner rotor volute blower according to claim 2, characterized in that: The stator assembly The outer periphery is also fixed with a heat dissipation protection plate; The heat dissipation protection plate is located above the fan casing; The upper part of the fan casing is provided with a plurality of protective plate mounting bosses which are distributed at intervals in the circumferential direction; the heat dissipation protective plate is fastened and mounted to the protective plate mounting bosses by fasteners.

5. The inner rotor volute blower according to claim 4, characterized in that: The outer periphery of the stator assembly is provided with a plurality of protrusions distributed at intervals, and a fastening groove is provided in each protrusion; the inner periphery of the heat dissipation protection plate is provided with a limiting groove that cooperates with each protrusion.

6. The inner rotor volute blower according to claim 4, characterized in that: The height of the protective plate mounting boss is smaller than the height of the fastening mounting boss.

7. The inner rotor volute blower according to claim 1, characterized in that: The fan casing includes an upper fan casing unit and a lower fan casing unit installed as one body, wherein the lower fan casing unit is provided with an air inlet connected to the impeller; and the upper fan casing unit is provided with the lower bearing seat.

8. The inner rotor volute blower according to claim 7, characterized in that: The lower end of the motor shaft is relatively rotatably mounted on the lower bearing seat via a lower bearing; the upper end of the motor shaft is relatively rotatably mounted on the motor end cover via an upper bearing.

9. The inner rotor volute blower according to claim 1, characterized in that: The stator core of the stator assembly adopts a 6-slot structure, and the magnetic ring of the rotor assembly adopts a 4-pole structure.

10. The inner rotor volute blower according to claim 1 or 6, characterized in that: The outer diameter of the fan casing is in the range of 65-70 mm.

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