Outer rotor centrifugal fan

Abstract

The utility model discloses an outer rotor centrifugal fan which comprises a volute and a motor installed in the volute, and further comprises motor supports, the motor supports are fixed to the volute and located at the two ends of the motor, the two ends of the motor are provided with motor shafts, the motor shafts are connected to the motor supports, and vibration reduction glue is arranged on the combination portions of the motor shafts and the motor supports. The motor in the outer rotor centrifugal fan is provided with the motor shafts on the two sides and is different from a cantilever type structure of a common outer rotor motor, so that the motor is easier to be arranged in the central area of the volute, the stress structure of the motor is balanced, the fluid efficiency of the fan can be improved, and the service life of the motor can be prolonged. The vibration damping glue is arranged at the joint part of the motor shaft and the motor bracket, so that rigid contact between the motor and the motor bracket can be isolated, and conduction of vibration generated in the operation process of the motor and vibration noise caused by the conduction are weakened.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, and more specifically, to an outer rotor centrifugal fan. Background Art

[0002] Centrifugal fans are the core equipment of air purification systems. Noise is a major issue during the operation of centrifugal fans, and many centrifugal fan suppliers are working tirelessly to address this problem. For example, the utility model patent with announcement number CN221195452U discloses an outer rotor centrifugal fan with a shock-absorbing mechanism. The fan has a cushioning pad mounted on the external plate of the volute side wall to reduce the vibration generated when the fan is turned on or off. However, this utility model only provides a solution to the shock absorption problem of the interface between the volute and the surrounding structure, and does not address the more important shock absorption problem of the connection between the volute and the motor. Therefore, the shock absorption effect is limited. Utility Model Content

[0003] The existing outer rotor centrifugal fan is relatively lacking in the shock absorption design of the connection structure between the motor and the volute, resulting in limited overall shock absorption effect. To overcome this defect, the utility model provides an outer rotor centrifugal fan that can more effectively control the vibration transmission between the motor and the volute, thereby enhancing the shock absorption effect.

[0004] The technical solution of the present utility model is: an outer rotor centrifugal fan, including a volute and a motor installed in the volute, and also including a motor bracket, the motor bracket is fixed to the volute and located at both ends of the motor, both ends of the motor have a motor shaft, the motor shaft is connected to the motor bracket, and the junction of the motor shaft and the motor bracket is provided with vibration-damping rubber. The motor in this outer rotor centrifugal fan has a double-sided motor shaft, which is different from the cantilever structure of an ordinary outer rotor motor. In this way, the motor is easier to be placed in the central area of ​​the volute, and the force structure of the motor is balanced, which not only improves the fluid efficiency of the fan, but also helps to increase the service life of the motor. The vibration-damping rubber is provided at the junction of the motor shaft and the motor bracket, which can isolate the rigid contact between the motor and the motor bracket, weaken the conduction of vibration generated during the operation of the motor, and the vibration noise caused thereby.

[0005] Preferably, the motor bracket includes a center ring and multiple legs radially connected to the center ring. The legs have mounting surfaces on their outer ends that mate with the volute, and vibration-damping rubber is installed within the center ring. The center ring supports the motor shaft, and the legs connect to the volute. With the motor bracket securing and supporting the motor, the motor can be installed in the center area of ​​the volute.

[0006] Preferably, a groove is provided on the edge of the end face of the vibration-damping rubber, and an inner protrusion is provided on the inner end of the center ring. The outer surface of the inner protrusion mates with the bottom of the groove. The inner protrusion cooperates with the groove to limit axial and circumferential movement of the motor, thereby better securing and supporting the motor.

[0007] Preferably, there are at least two slots. The matching structure of multiple sets of inner protrusions and slots can better distribute the force, making the force structure between the vibration-damping rubber and the motor bracket more balanced.

[0008] Preferably, a coupling connected to the motor shaft is inserted into the vibration-damping rubber. The vibration-damping rubber is provided with a keyway, and the coupling is provided with a key bar that fits into the keyway. The coupling is a transitional component located between the motor shaft and the vibration-damping rubber, ensuring a more stable connection between the motor and the motor bracket.

[0009] Preferably, the motor includes a housing and end covers, wherein permanent magnets and stator windings are arranged in the housing, the end covers are fixed to both ends of the housing, the motor shaft is fixed to the stator windings, and the end covers are rotatably connected to the motor shaft.

[0010] Preferably, a dust cover coaxial with the end cover is provided on the outer side of the end cover, the dust cover is sleeved on the motor shaft and the end of the dust cover is in close contact with the end cover. The dust cover can improve the waterproof and dustproof level of the motor.

[0011] Preferably, the shell port is provided with a folding ear, and the shell and the end cover are fixedly connected via the folding ear. The folding ear is bent and fastened to fix the end cover, thereby achieving screw-free assembly.

[0012] The beneficial effects of the utility model are:

[0013] Enhanced shock absorption effect: The utility model sets a vibration-damping rubber at the joint of the motor shaft and the motor bracket, which can isolate the rigid contact between the motor and the motor bracket, weaken the conduction of vibration generated during the operation of the motor, and the vibration noise caused thereby.

[0014] Improve the fluid efficiency of the fan. The motor in the utility model has a double-sided motor shaft. This symmetrical structure makes it easier to place the motor in the central area of ​​the volute, thereby improving the fluid efficiency of the fan.

[0015] The double-sided motor shaft structure of the motor in the present invention can make the force structure of the motor more balanced; in addition, the dust cover can also improve the waterproof and dustproof level of the motor, which is conducive to prolonging the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of the present utility model.

[0017] Figure 2 This is a front view of the present utility model.

[0018] Figure 3 This is a cross-sectional view of the present invention.

[0019] Figure 4 This is a schematic diagram of a split structure of the utility model.

[0020] Figure 5 This is a structural schematic diagram of the motor bracket in the utility model.

[0021] Figure 6 This is a structural diagram of the vibration-damping rubber in the present utility model.

[0022] Figure 7 This is a structural schematic diagram of the coupling in the utility model.

[0023] Figure 8 This is a structural diagram of the motor in the present utility model.

[0024] Figure 9 This is a schematic diagram of the longitudinal section structure of the motor in the present utility model.

[0025] Figure 10 This is a structural schematic diagram of the housing of the motor in the present utility model.

[0026] Figure 11 This is a structural schematic diagram of the end cover of the motor in the present utility model.

[0027] In the figure: 1-volute, 101-air guide ring, 2-motor, 201-motor shaft, 202-housing, 203-end cover, 204-permanent magnet, 205-stator winding, 206-dust cover, 207-folding ear, 3-motor bracket, 301-center ring, 302-support foot, 303-mounting surface, 304-inner convex part, 4-vibration damping rubber, 401-slot, 402-keyway, 403-vibration damping rubber center hole, 5-coupling, 501-key strip, 502-end disk, 503-center sleeve, 6-centrifugal impeller. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the specific embodiments of the drawings.

[0029] Example 1:

[0030] like Figures 1 to 11As shown, an external rotor centrifugal fan includes a volute 1, a motor 2, a motor bracket 3, and a vibration-damping rubber 4. The volute 1 has a cylindrical main cavity, with air guide rings 101 bolted to both end ports of the main cavity. The air guide rings 101 have a trumpet-shaped outer annular surface. The motor bracket 3 includes a center ring 301 and three legs 302. The legs 302 are radially arranged in a Y shape around the center ring 301. The inner end of each leg 302 is welded to the center ring 301, and the outer end of each leg 302 is stamped to form a mounting surface 303. The mounting surface 303 is aligned with the end face of the volute 1 and fixed with bolts, so that the motor bracket 3 is fixed to the air guide ring 101 at the end of the main cavity of the volute 1, and the center ring 301 is coaxial with the main cavity of the volute 1. Both ends of the motor 2 have a motor shaft 201. The motor bracket 3 corresponds one-to-one with the motor shafts 201 at both ends of the motor 2. The motor shaft 201 is inserted into the center ring 301 of the motor bracket 3, so that the motor 2 is suspended and installed in the center area of ​​the volute 1 under the support of the motor bracket 3. The vibration-damping rubber 4 is installed in the center ring 301. The vibration-damping rubber 4 is provided with a slot 401. The slot 401 is recessed in the outer circumference of the vibration-damping rubber 4. The bottom of the slot 401 is arc-shaped. The inner wall end of the center ring 301 is welded with an arc-shaped strip to form an inner convex portion 304. The outer surface of the inner convex portion 304 matches the bottom of the slot 401. There are three slots 401 and they are evenly distributed around the circumference of the vibration-damping rubber 4.

[0031] The coupling 5 is inserted into the vibration damping rubber 4, and the coupling 5 is connected to the motor shaft 201. The vibration damping rubber 4 is provided with a vibration damping rubber center hole 403 and three key slots 402. The key slots 402 are radially distributed around the vibration damping rubber center hole 403 and are connected to the vibration damping rubber center hole 403. The coupling 5 includes an end plate 502, a key strip 501 and a center sleeve 503. The end plate 502 is connected to one end of the center sleeve 503. There are three key strips 501 and they are evenly distributed around the center sleeve 503. The disk 502, the key bar 501 and the coupling 5 are integrally formed, and the center sleeve 503 has an arched shaft hole. The end of the motor shaft 201 is adapted to be plugged into the shaft hole after local flattening of the circumference. A tightening screw is radially installed on the key bar 501 corresponding to the chord of the bow of the shaft hole. The tightening screw enters the shaft hole and presses the plane on the motor shaft 201. The center sleeve 503 is adapted to be plugged into the center hole 403 of the vibration-damping rubber and the key bar 501 is adapted to be inserted into the keyway 402 in a one-to-one correspondence.

[0032] Motor 2 includes a housing 202, end caps 203, permanent magnets 204, and stator windings 205. Permanent magnets 204 and stator windings 205 are mounted within housing 202. End caps 203 are fixed to both ends of housing 202. Sealing rings are provided at the junction between end caps 203 and housing 202. Motor shaft 201 is fixed to stator windings 205, and end caps 203 are rotatably connected to motor shaft 201 via bearings. A dust cover 206 is provided on the outside of end caps 203. Dust cover 206 is coaxial with end cap 203 and sleeved onto motor shaft 201, with the end of dust cover 206 in close contact with end cap 203. Dust cover 206 is made of plastic. The housing 202 is made of seamless steel pipe. The end of the housing 202 is provided with a folding ear 207, which is integrally formed with the housing 202. The end of the end cap 203 is provided with a step. The folding ear 207 is bent and presses against the step surface, generating an axial restraining force between the housing 202 and the end cap 203, thereby securing the housing 202 and the end cap 203 via the folding ear 207. The centrifugal impeller 6 is fixed to the housing 202. The motor shaft 201 is an integrally formed, semi-hollow, semi-solid shaft, with its ends exposed outside the two end caps 203. One end of the motor shaft 201 is hollow, housing the wires connected to the stator winding 205. The other end is solid.

[0033] When this external rotor centrifugal fan is in operation, the motor shaft 201 and stator winding 205 are fixed to the volute 1 by the motor bracket 3. The outer casing 202 and end cover 203 rotate around the motor shaft 201, driving the centrifugal impeller 6 to rotate, generating airflow within the volute 1. Because the vibration-damping rubber 4 isolates the rigid contact between the motor 2 and the motor bracket 3, it weakens the transmission of vibrations generated by the motor 2 during operation, thereby reducing the vibration and noise caused by the vibration of the motor 2 during operation.

[0034] Example 2:

[0035] An external rotor centrifugal fan includes a volute 1, a motor 2, a motor bracket 3, and a vibration-damping rubber 4. The volute 1 has a cylindrical main cavity, with air guide rings 101 mounted to both end ports of the main cavity via bolts. The air guide rings 101 have a trumpet-shaped outer annular surface. Unlike Example 1, the motor bracket 3 in this embodiment includes a center ring 301 and four legs 302. The legs 302 are radially arranged in a cross shape around the center ring 301. The inner end of each leg 302 is welded to the center ring 301, and the outer end of each leg 302 is stamped to form a mounting surface 303. The mounting surface 303 is affixed to the end face of the volute 1 and secured with bolts, thereby fixing the motor bracket 3 to the air guide ring 101 at the end of the main cavity of the volute 1, and the center ring 301 is coaxial with the main cavity of the volute 1. Both ends of the motor 2 have a motor shaft 201. The motor bracket 3 corresponds one-to-one with the motor shaft 201 at both ends of the motor 2. The motor shaft 201 is inserted into the center ring 301 of the motor bracket 3, so that the motor 2 is suspended and installed in the central area of ​​the volute 1 under the support of the motor bracket 3. The vibration-damping rubber 4 is installed in the center ring 301. The vibration-damping rubber 4 is provided with a slot 401. The slot 401 is recessed in the outer peripheral surface of the vibration-damping rubber 4. The bottom of the slot 401 is arc-shaped. The inner wall end of the center ring 301 is welded with an arc-shaped strip to form an inner convex portion 304. The outer surface of the inner convex portion 304 matches and fits with the bottom of the slot 401. There are two slots 401 and they are symmetrical about the center of the vibration-damping rubber 4 in the circumferential direction of the vibration-damping rubber 4.

[0036] The coupling 5 is inserted into the vibration damping rubber 4, and the coupling 5 is connected to the motor shaft 201. The vibration damping rubber 4 is provided with a vibration damping rubber center hole 403 and three key slots 402. The key slots 402 are radially distributed around the vibration damping rubber center hole 403 and are connected to the vibration damping rubber center hole 403. The coupling 5 includes an end plate 502, a key strip 501 and a center sleeve 503. The end plate 502 is connected to one end of the center sleeve 503. There are three key strips 501 and they are evenly distributed around the center sleeve 503. The disk 502, the key bar 501 and the coupling 5 are integrally formed, and the center sleeve 503 has an arched shaft hole. The end of the motor shaft 201 is adapted to be plugged into the shaft hole after local flattening of the circumference. A tightening screw is radially installed on the key bar 501 corresponding to the chord of the bow of the shaft hole. The tightening screw enters the shaft hole and presses the plane on the motor shaft 201. The center sleeve 503 is adapted to be plugged into the center hole 403 of the vibration-damping rubber and the key bar 501 is adapted to be inserted into the keyway 402 in a one-to-one correspondence.

[0037] Motor 2 includes a housing 202, end caps 203, permanent magnets 204, and stator windings 205. Permanent magnets 204 and stator windings 205 are mounted within housing 202. End caps 203 are fixed to both ends of housing 202. Sealing rings are provided at the junction between end caps 203 and housing 202. Motor shaft 201 is fixed to stator windings 205, and end caps 203 are rotatably connected to motor shaft 201 via bearings. A dust cover 206 is provided on the outside of end caps 203. Dust cover 206 is coaxial with end cap 203 and sleeved onto motor shaft 201, with the end of dust cover 206 in close contact with end cap 203. Dust cover 206 is made of plastic. The housing 202 is made of seamless steel pipe. The end of the housing 202 is provided with a folding ear 207, which is integrally formed with the housing 202. The end of the end cap 203 is provided with a step. The folding ear 207 is bent and pressed against the step surface, generating an axial restraining force between the housing 202 and the end cap 203, thereby securing the housing 202 and the end cap 203 via the folding ear 207. A centrifugal impeller 6 is fixed to the housing 202. The motor shaft 201 is an integrally formed, semi-hollow, semi-solid shaft, with its ends exposed outside the two end caps 203. One end of the motor shaft 201 is hollow, housing the conductors connected to the stator winding 205. The other end is solid. The remaining structure is the same as in Example 1.

[0038] When this external rotor centrifugal fan is in operation, the motor shaft 201 and stator winding 205 are fixed to the volute 1 by the motor bracket 3. The outer casing 202 and end cover 203 rotate around the motor shaft 201, driving the centrifugal impeller 6 to rotate, generating airflow within the volute 1. Because the vibration-damping rubber 4 isolates the rigid contact between the motor 2 and the motor bracket 3, it weakens the transmission of vibrations generated by the motor 2 during operation, thereby reducing the vibration and noise caused by the vibration of the motor 2 during operation.

[0039] Example 3:

[0040] An external rotor centrifugal fan includes a volute 1, a motor 2, a motor bracket 3, and vibration-damping rubber 4. The volute 1 has a cylindrical main cavity, with air guide rings 101 bolted to both end ports of the main cavity. The air guide rings 101 have a trumpet-shaped outer annular surface. The motor bracket 3 includes a center ring 301 and four legs 302. The legs 302 are radially arranged in a cross shape around the center ring 301. The inner end of each leg 302 is welded to the center ring 301, and the outer end of each leg 302 is stamped to form a mounting surface 303. The mounting surface 303 is aligned with the end face of the volute 1 and fixed with bolts, so that the motor bracket 3 is fixed to the air guide ring 101 at the end of the volute 1 main cavity. The center ring 301 is coaxial with the main cavity of the volute 1. Both ends of the motor 2 have a motor shaft 201. The motor bracket 3 corresponds one-to-one with the motor shafts 201 at both ends of the motor 2. The motor shaft 201 is inserted into the center ring 301 of the motor bracket 3, so that the motor 2 is suspended and installed in the central area of ​​the volute 1 under the support of the motor bracket 3. The vibration-damping rubber 4 is installed in the center ring 301. The vibration-damping rubber 4 is provided with a card slot 401, which is recessed in the outer peripheral surface of the vibration-damping rubber 4. Unlike Example 2, the bottom of the card slot 401 in this embodiment is V-shaped, and an arc-shaped arrow-shaped protrusion is welded to the end of the inner wall of the center ring 301 to form an inner convex portion 304. The outer surface of the inner convex portion 304 matches and fits with the bottom of the card slot 401. There are three card slots 401 and they are evenly distributed in the circumferential direction of the vibration-damping rubber 4.

[0041] The coupling 5 is inserted into the vibration damping rubber 4, and the coupling 5 is connected to the motor shaft 201. The vibration damping rubber 4 is provided with a vibration damping rubber center hole 403 and three key slots 402. The key slots 402 are radially distributed around the vibration damping rubber center hole 403 and are connected to the vibration damping rubber center hole 403. The coupling 5 includes an end plate 502, a key strip 501 and a center sleeve 503. The end plate 502 is connected to one end of the center sleeve 503. There are three key strips 501 and they are evenly distributed around the center sleeve 503. The disk 502, the key bar 501 and the coupling 5 are integrally formed, and the center sleeve 503 has an arched shaft hole. The end of the motor shaft 201 is adapted to be plugged into the shaft hole after local flattening of the circumference. A tightening screw is radially installed on the key bar 501 corresponding to the chord of the bow of the shaft hole. The tightening screw enters the shaft hole and presses the plane on the motor shaft 201. The center sleeve 503 is adapted to be plugged into the center hole 403 of the vibration-damping rubber and the key bar 501 is adapted to be inserted into the keyway 402 in a one-to-one correspondence.

[0042] Motor 2 includes a housing 202, end caps 203, permanent magnets 204, and stator windings 205. Permanent magnets 204 and stator windings 205 are mounted within housing 202. End caps 203 are fixed to both ends of housing 202. Sealing rings are provided at the junction between end caps 203 and housing 202. Motor shaft 201 is fixed to stator windings 205, and end caps 203 are rotatably connected to motor shaft 201 via bearings. A dust cover 206 is provided on the outside of end caps 203. Dust cover 206 is coaxial with end cap 203 and sleeved onto motor shaft 201, with the end of dust cover 206 in close contact with end cap 203. Dust cover 206 is made of plastic. The housing 202 is made of seamless steel pipe. The end of the housing 202 is provided with a folding ear 207, which is integrally formed with the housing 202. The end of the end cap 203 is provided with a step. The folding ear 207 is bent and pressed against the step surface, generating an axial restraining force between the housing 202 and the end cap 203, thereby securing the housing 202 and the end cap 203 via the folding ear 207. A centrifugal impeller 6 is fixed to the housing 202. The motor shaft 201 is an integrally formed, semi-hollow, semi-solid shaft, with its ends exposed outside the two end caps 203. One end of the motor shaft 201 is hollow, housing the wires connected to the stator winding 205. The other end is solid. The remaining structure is the same as in Example 2.

[0043] When this external rotor centrifugal fan is in operation, the motor shaft 201 and stator winding 205 are fixed to the volute 1 by the motor bracket 3. The outer casing 202 and end cover 203 rotate around the motor shaft 201, driving the centrifugal impeller 6 to rotate, generating airflow within the volute 1. Because the vibration-damping rubber 4 isolates the rigid contact between the motor 2 and the motor bracket 3, it weakens the transmission of vibrations generated by the motor 2 during operation, thereby reducing the vibration and noise caused by the vibration of the motor 2 during operation.

[0044] Example 4:

[0045] An external rotor centrifugal fan includes a volute 1, a motor 2, a motor bracket 3, and vibration-damping rubber 4. The volute 1 has a cylindrical main cavity, with air guide rings 101 bolted to both end ports of the main cavity. The air guide rings 101 have a trumpet-shaped outer annular surface. The motor bracket 3 includes a center ring 301 and three legs 302. The legs 302 are radially arranged in a Y-shape around the center ring 301. The inner end of each leg 302 is welded to the center ring 301, and the outer end of each leg 302 is stamped to form a mounting surface 303. The mounting surface 303 is aligned with the end face of the volute 1 and secured with bolts, thereby securing the motor bracket 3 to the air guide ring 101 at the end of the main cavity of the volute 1. The center ring 301 is coaxial with the main cavity of the volute 1. Both ends of the motor 2 have a motor shaft 201. The motor bracket 3 corresponds one-to-one to the motor shaft 201 at both ends of the motor 2. The motor shaft 201 is inserted into the center ring 301 of the motor bracket 3, so that the motor 2 is suspended and installed in the central area of ​​the volute 1 under the support of the motor bracket 3. The vibration-damping rubber 4 is installed in the center ring 301. A card slot 401 is provided on the vibration-damping rubber 4. The card slot 401 is recessed on the outer peripheral surface of the vibration-damping rubber 4. The bottom of the card slot 401 is arc-shaped. An arc-shaped strip is welded to the end of the inner wall of the center ring 301 to form an inner convex portion 304. The outer surface of the inner convex portion 304 matches and fits with the bottom of the card slot 401. Different from Example 1, there are four card slots 401 in this embodiment and they are evenly distributed in the circumferential direction of the vibration-damping rubber 4.

[0046] The coupling 5 is inserted into the vibration damping rubber 4, and the coupling 5 is connected to the motor shaft 201. The vibration damping rubber 4 is provided with a vibration damping rubber center hole 403 and three key slots 402. The key slots 402 are radially distributed around the vibration damping rubber center hole 403 and are connected to the vibration damping rubber center hole 403. The coupling 5 includes an end plate 502, a key strip 501 and a center sleeve 503. The end plate 502 is connected to one end of the center sleeve 503. There are three key strips 501 and they are evenly distributed around the center sleeve 503. The disk 502, the key bar 501 and the coupling 5 are integrally formed, and the center sleeve 503 has an arched shaft hole. The end of the motor shaft 201 is adapted to be plugged into the shaft hole after local flattening of the circumference. A tightening screw is radially installed on the key bar 501 corresponding to the chord of the bow of the shaft hole. The tightening screw enters the shaft hole and presses the plane on the motor shaft 201. The center sleeve 503 is adapted to be plugged into the center hole 403 of the vibration-damping rubber and the key bar 501 is adapted to be inserted into the keyway 402 in a one-to-one correspondence.

[0047] Motor 2 includes a housing 202, end caps 203, permanent magnets 204, and stator windings 205. Permanent magnets 204 and stator windings 205 are mounted within housing 202. End caps 203 are fixed to both ends of housing 202. Sealing rings are provided at the junction between end caps 203 and housing 202. Motor shaft 201 is fixed to stator windings 205, and end caps 203 are rotatably connected to motor shaft 201 via bearings. A dust cover 206 is provided on the outside of end caps 203. Dust cover 206 is coaxial with end cap 203 and sleeved onto motor shaft 201, with the end of dust cover 206 in close contact with end cap 203. Dust cover 206 is made of plastic. The housing 202 is made of seamless steel pipe. The end of the housing 202 is provided with a folding ear 207, which is integrally formed with the housing 202. The end of the end cap 203 is provided with a step. The folding ear 207 is bent and presses against the step surface, generating an axial restraining force between the housing 202 and the end cap 203, thereby securing the housing 202 and the end cap 203 via the folding ear 207. The centrifugal impeller 6 is fixed to the housing 202. The motor shaft 201 is an integrally formed, semi-hollow, semi-solid shaft, with its ends exposed outside the two end caps 203. One end of the motor shaft 201 is hollow, housing the wires connected to the stator winding 205. The other end is solid.

[0048] When this external rotor centrifugal fan is in operation, the motor shaft 201 and stator winding 205 are fixed to the volute 1 by the motor bracket 3. The outer casing 202 and end cover 203 rotate around the motor shaft 201, driving the centrifugal impeller 6 to rotate, generating airflow within the volute 1. Because the vibration-damping rubber 4 isolates the rigid contact between the motor 2 and the motor bracket 3, it weakens the transmission of vibrations generated by the motor 2 during operation, thereby reducing the vibration and noise caused by the vibration of the motor 2 during operation.

Claims

1. An outer rotor centrifugal fan, comprising a volute (1) and a motor (2) mounted in the volute (1), characterized in that: The motor bracket (3) is fixed to the volute (1) and is located at both ends of the motor (2). Both ends of the motor (2) have a motor shaft (201). The motor shaft (201) is connected to the motor bracket (3). A vibration-damping rubber (4) is provided at the joint between the motor shaft (201) and the motor bracket (3).

2. The outer rotor centrifugal fan according to claim 1, characterized in that: The motor bracket (3) includes a center ring (301) and a plurality of legs (302), the legs (302) are radially connected to the center ring (301), the outer ends of the legs (302) are provided with mounting surfaces (303) that cooperate with the volute (1), and the vibration-damping rubber (4) is installed in the center ring (301).

3. The outer rotor centrifugal fan according to claim 2, characterized in that: A clamping groove (401) is provided on the outer peripheral surface of the vibration-damping rubber (4), an inner convex portion (304) is provided on the inner wall end of the center ring (301), and the outer surface of the inner convex portion (304) is matched and fitted with the bottom of the clamping groove (401).

4. The outer rotor centrifugal fan according to claim 3, characterized in that: There are at least two card slots (401).

5. The outer rotor centrifugal fan according to claim 1, characterized in that: A coupling (5) connected to the motor shaft (201) is inserted into the vibration-damping rubber (4), a keyway (402) is provided on the vibration-damping rubber (4), a key bar (501) is provided on the coupling (5), and the key bar (501) is adapted to be inserted into the keyway (402).

6. The outer rotor centrifugal fan according to claim 1, 2, 3, 4 or 5, characterized in that: The motor (2) comprises a housing (202) and an end cover (203). A permanent magnet (204) and a stator winding (205) are provided in the housing (202). The end cover (203) is fixed to both ends of the housing (202). The motor shaft (201) is fixed to the stator winding (205). The end cover (203) is rotatably connected to the motor shaft (201).

7. The outer rotor centrifugal fan according to claim 6, characterized in that: A dust cover (206) coaxial with the end cover (203) is provided on the outside of the end cover (203); the dust cover (206) is sleeved on the motor shaft (201) and a port of the dust cover (206) is in close contact with the end cover (203).

8. The outer rotor centrifugal fan according to claim 6, characterized in that: The housing (202) and the end cover (203) are fixedly connected via folding ears (207).

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