CN215109614U

CN215109614U - External rotor centrifugal fan

Info

Publication number: CN215109614U
Application number: CN202121497377.4U
Authority: CN
Inventors: 郑奎
Original assignee: Dongguan Shengtu New Energy Technology Co ltd
Current assignee: Dongguan Shengtu New Energy Technology Co ltd
Priority date: 2021-07-02
Filing date: 2021-07-02
Publication date: 2021-12-10
Anticipated expiration: 2031-07-02

Abstract

The utility model provides a pair of external rotor centrifugal fan, contain the base, the annular circuit board, a stator, a rotor, centrifugal fan blade, the stator includes the axle sleeve, the iron core, the winding, axle sleeve and base pass through axle sleeve screw fixation, the axle sleeve is outer along being equipped with circuit board location platform, the annular circuit board is fixed through first set screw with circuit board location platform, the axle sleeve is outer along being equipped with iron core location platform, the iron core suit is at iron core location platform upside, the rotor includes the rotor shell, the apparatus further comprises a rotating shaft, the magnetite, the axle sleeve both ends are equipped with first bearing groove and the second bearing groove that loads first ball bearing and second ball bearing respectively, second ball bearing downside superpose in proper order and establish the shell fragment packing ring in the pivot, the gasket, the retaining ring. The annular circuit board and the base are fixed on the shaft sleeve through the first positioning screws and the shaft sleeve screws respectively, and the annular circuit board and the iron core are limited through the circuit board positioning table and the iron core positioning table respectively. The fan is convenient to disassemble and assemble, the assembling and maintaining efficiency of the fan is effectively improved, and the yield is improved.

Description

External rotor centrifugal fan

Technical Field

The utility model relates to a motor indicates an external rotor centrifugal fan especially.

Background

The centrifugal fan mainly comprises a motor and a centrifugal impeller arranged on a rotating shaft of the motor, the motor is also divided into an outer rotor motor and an inner rotor motor according to a rotor assembly mode, and the outer rotor type centrifugal fan is widely used. The outer rotor centrifugal fan is formed by assembling a plurality of large and small parts, the structure is complex, and the outer rotor centrifugal fan can be combined only through a plurality of assembling steps, wherein a plurality of parts are adhered by glue, the production time is long, the yield is low, partial components cannot be disassembled when the fan has problems and needs to be maintained, and partial components can be scrapped due to the fact that the components can be disassembled only in a violent mode under certain conditions, so that great difficulty is caused for maintenance of the fan.

Disclosure of Invention

The utility model aims to solve the problem that a rotor centrifugal fan is provided, dismouting that can relax improves equipment and maintenance efficiency, increase of production.

The outer rotor centrifugal fan comprises a base, an annular circuit board, a stator, a rotor and a centrifugal fan blade, wherein the stator comprises a shaft sleeve, an iron core and a winding wound on the iron core, a bearing hole communicated with an inner ring of the shaft sleeve is arranged at the bottom of the base in a penetrating manner, the bottom end of the shaft sleeve and the bottom of the base are fixed by shaft sleeve screws arranged at the bottom of the base in a penetrating manner, a circuit board positioning table is arranged at one side of the outer edge of the shaft sleeve, the annular circuit board and the circuit board positioning table are fixed by a plurality of first positioning screws arranged on the annular circuit board in a penetrating manner, an iron core positioning table is arranged at one side of the outer edge of the shaft sleeve, the iron core is sleeved on the shaft sleeve and is abutted against the top end of the iron core positioning table, the rotor comprises a rotor shell, a rotating shaft fixedly connected at the center of the rotor shell, a magnet fixedly connected on the inner ring of the rotor shell, and the centrifugal fan blade comprises a sleeve hole in interference fit with the rotor shell, the sleeve joint hole is sleeved on the rotor shell, a first bearing groove and a second bearing groove are respectively arranged at two ends of the inner ring of the shaft sleeve, a first ball bearing and a second ball bearing which are in interference fit with the first bearing groove and the second bearing groove are respectively arranged on the first bearing groove and the second bearing groove, the rotating shaft is arranged on the inner ring of the first ball bearing and the second ball bearing in a penetrating mode, a prepressing table which is abutted to the retaining cover on the first ball bearing is arranged at the center of the inner top face of the rotor shell, an elastic sheet gasket, a gasket and a check ring which are sleeved on the rotating shaft are sequentially overlapped at the lower side of the second ball bearing, a clamping groove is arranged on one side of the outer edge of the rotating shaft, the check ring is clamped on the clamping groove, and the elastic sheet gasket is abutted to the retaining cover and the gasket under the second ball bearing.

Preferably, the top end of the shaft sleeve is provided with a plurality of shaft sleeve screw holes, the bottom of the base is provided with a plurality of base screw holes corresponding to the shaft sleeve screw holes in a penetrating mode, the shaft sleeve screws penetrate through the base screw holes and are in threaded connection with the shaft sleeve screw holes, the circuit board positioning table is provided with a plurality of circuit board screw holes, the annular circuit board is provided with a plurality of positioning notches corresponding to the circuit board screw holes in a penetrating mode, and the first positioning screws penetrate through the positioning notches and are in threaded connection with the circuit board screw holes.

Preferably, the outer edge of the shaft sleeve is provided with a clamping portion, a screw hole of the shaft sleeve is formed in the clamping portion, a clamping opening matched with the clamping portion is formed in the inner edge of the annular circuit board, the clamping portion is arranged on the clamping opening to position the annular circuit board, a guide groove is formed in one end of an inner ring of the shaft sleeve, a guide ring matched with the guide groove is arranged at the bottom of the base, and the guide ring is inserted into the guide groove.

Preferably, the bottom of the base is provided with a plurality of supporting tables supported on the bottom surface of the annular circuit board, a plurality of circuit board mounting holes are arranged between the supporting tables and the base in a penetrating manner, positioning screw holes corresponding to the circuit board mounting holes are arranged on the annular circuit board in a penetrating manner, and second positioning screws in threaded connection with the positioning screw holes are arranged on the circuit board mounting holes; the stator further comprises an upper coil holder and a lower coil holder which are respectively adjacent to the top surface and the bottom surface of the iron core, the upper coil holder and the lower coil holder are fixed on the iron core through winding, a supporting inclined plane is arranged on the outer edge of the shaft sleeve in a surrounding mode, the lower coil holder comprises an annular portion sleeved on the shaft sleeve, and the bottom end of the annular portion abuts against the supporting inclined plane.

Preferably, first lead grooves are formed in two sides of the inner ring of the iron core, second lead grooves communicated with the first lead grooves are formed in the outer side of the iron core positioning table, lead holes communicated with the second lead grooves penetrate through the circuit board positioning table, and lead wires of the winding are led out from the upper side of the iron core and sequentially penetrate through the first lead grooves, the second lead grooves and the lead holes to be electrically connected with the annular circuit board.

Preferably, the outer wall of the rotor shell is divided into a guide portion and a joint portion from top to bottom, the guide portion is in clearance fit with the sleeve hole, the joint portion is in interference fit with the sleeve hole, a guide inclined plane is arranged between the guide portion and the joint portion, and the sleeve hole is sleeved on the joint portion.

The utility model has the advantages that: the utility model provides an external rotor centrifugal fan, set up unique assembly structure, fix annular circuit board and base on the axle sleeve through first set screw and axle sleeve screw respectively, utilize the retaining ring to block the pivot and guarantee that the prepressing platform and the shell fragment packing ring that are connected with the pivot compress tightly first ball bearing and second ball bearing, thereby fix a position the iron core on the iron core location bench, do spacingly to annular circuit board and iron core respectively through circuit board location platform and iron core location platform, guarantee that annular circuit board and iron core assembly are firm, need not to use glue to bond between different parts. The fan is convenient to assemble, and parts can be disassembled easily, so that the assembling and maintaining efficiency of the fan is effectively improved, the yield is improved, and the processing cost is saved.

Drawings

Fig. 1 illustrates an exploded view of the present invention.

Fig. 2 illustrates a partially enlarged schematic view of a portion a in fig. 1 according to the present invention.

Fig. 3 illustrates a schematic cross-sectional structure of the present invention.

Fig. 4 illustrates a partial enlarged structural diagram of a portion B in fig. 3 according to the present invention.

Fig. 5 illustrates a schematic structural view of the shaft sleeve of the present invention.

The reference numbers illustrate: a base 1, a bearing hole 100, a base screw hole 101, a guide ring 102, a support table 103, a circuit board mounting hole 104, an annular circuit board 2, a first positioning screw 200, a positioning notch 201, a clamping opening 202, a positioning screw hole 203, a second positioning screw 204, a centrifugal fan blade 3, a sleeving hole 30, a shaft sleeve 4, a shaft sleeve screw 40, a circuit board positioning table 41, a lead hole 410, an iron core positioning table 42, a second lead groove 420, a first bearing groove 43, a second bearing groove 44 and a shaft sleeve screw hole 45, the circuit board comprises a circuit board screw hole 46, an engaging part 47, a guide groove 48, a supporting inclined surface 49, an iron core 5, a first lead groove 50, a rotor shell 6, a prepressing table 60, a guide part 600, a joint part 601, a guide inclined surface 602, a rotating shaft 7, a clamping groove 70, a magnet 8, a first ball bearing 9, a second ball bearing 11, an elastic sheet gasket 12, a retainer ring 13, an upper coil holder 14, a lower coil holder 15, an annular part 150 and a gasket 16.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments.

All other embodiments of the person skilled in the art, which are obtained without inventive work on the basis of the described embodiments of the present disclosure, are within the scope of protection of the present disclosure.

Refer to fig. 1-5.

The utility model provides an outer rotor centrifugal fan, which comprises a base 1, an annular circuit board 2, a stator, a rotor and a centrifugal fan blade 3, wherein the stator comprises a shaft sleeve 4, an iron core 5 and a winding wound on the iron core 5, the bottom of the base 1 is provided with a bearing hole 100 communicated with the inner ring of the shaft sleeve 4 in a penetrating way, the bottom of the shaft sleeve 4 and the bottom of the base 1 are fixed by a shaft sleeve screw 40 arranged at the bottom of the base 1 in a penetrating way, a circuit board positioning table 41 is arranged at one side of the outer edge of the shaft sleeve 4, the annular circuit board 2 and the circuit board positioning table 41 are fixed by a plurality of first positioning screws 200 arranged on the annular circuit board 2 in a penetrating way, an iron core positioning table 42 is arranged at one side of the outer edge of the shaft sleeve 4, the iron core 5 is sleeved on the shaft sleeve 4 and is abutted to the top end of the iron core positioning table 42, the rotor comprises a rotor shell 6, a rotating shaft 7 fixedly connected to the center of the rotor shell 6 and a magnet 8 fixedly connected to the inner ring of the rotor shell 6, the centrifugal fan blade 3 comprises a sleeve hole 30 which is in interference fit with the rotor shell 6, the sleeve hole 30 is sleeved on the rotor shell 6, two ends of an inner ring of the shaft sleeve 4 are respectively provided with a first bearing groove 43 and a second bearing groove 44, the first bearing groove 43 and the second bearing groove 44 are respectively provided with a first ball bearing 9 and a second ball bearing 11 which are in interference fit with the first bearing groove 43 and the second bearing groove 44, the rotating shaft 7 is arranged on the inner rings of the first ball bearing 9 and the second ball bearing 11 in a penetrating way, the center of the inner top surface of the rotor shell 6 is provided with a prepressing table 60 which is abutted against the first ball bearing 9 to keep covering, the lower side of the second ball bearing 11 is sequentially overlapped with an elastic sheet gasket 12 and a gasket 16 which are sleeved on the rotating shaft 7, a clamping groove 70 is formed in one side of the outer edge of the rotating shaft 7 of the retainer ring 13, the retainer ring 13 is clamped on the clamping groove 70, and the spring washer 12 abuts against the lower portion of the second ball bearing 11 and is kept between the cover and the gasket 16.

During the specific assembly, firstly, the rotating shaft 7 and the magnet 8 are assembled on the rotor shell 6, the sleeving hole 30 of the centrifugal fan blade 3 is pressed into the rotor shell 6 for fixation, the annular circuit board 2 is sleeved on the circuit board positioning table 41 and is locked by the first positioning screw 200, the shaft sleeve 4 is locked on the base 1 by the shaft sleeve screw 40, the iron core 5 with the winding is sleeved on the iron core positioning table 42, the first ball bearing 9 is placed on the first bearing groove 43, the rotating shaft 7 penetrates through the inner ring of the first ball bearing 9 from the upper part of the first ball bearing 9 to realize the assembly of the rotor, the assembled component is placed on the second bearing groove 44 through the bearing hole 100 after being inverted, the elastic sheet gasket 12 and the gasket 16 are sequentially sleeved on the rotating shaft 7, and the retainer ring 13 is pressed on the gasket 16 and clamped on the clamping groove 70, namely, the assembly of the fan is completed. It fixes annular circuit board 2 and base 1 on axle sleeve 4 through first set screw 200 and axle sleeve screw 40 respectively, utilizes retaining ring 13 to block pivot 7 and guarantees that pre-compaction platform 60 and shell fragment packing ring 12 be connected with pivot 7 compress tightly first ball bearing 9 and second ball bearing 11 to fix a position iron core 5 on iron core locating table 42, do spacingly to annular circuit board 2 and iron core 5 respectively through circuit board locating table 41 and iron core locating table 42, guarantee that annular circuit board 2 and iron core 5 assemble firmly. The fan has the advantages of compact structure, no need of using glue to bond different parts, convenient assembly, easy disassembly of the parts, effective improvement of the assembly and maintenance efficiency of the fan, improvement of the yield and saving of the processing cost.

Based on the above embodiment, the top end of the shaft sleeve 4 is provided with a plurality of shaft sleeve screw holes 45, the bottom of the base 1 is provided with a plurality of base screw holes 101 corresponding to the shaft sleeve screw holes 45 in a penetrating manner, the shaft sleeve screws 40 penetrate through the base screw holes 101 and are in threaded connection with the shaft sleeve screw holes 45, the circuit board positioning table 41 is provided with a plurality of circuit board screw holes 46, the annular circuit board 2 is provided with a plurality of positioning notches 201 corresponding to the circuit board screw holes 46 in a penetrating manner, and the first positioning screws 200 penetrate through the positioning notches 201 and are in threaded connection with the circuit board screw holes 46. The shaft sleeve screw 40 penetrates through a base screw hole 101 arranged at the bottom side of the base 1 and is connected with a shaft sleeve screw hole 45, so that the shaft sleeve 4 is conveniently locked, the first positioning screw 200 is connected with a circuit board screw hole 46 through a positioning notch 201, the annular circuit board 2 can be limited and fixed, and the assembly is convenient and the structure is stable.

Based on the above embodiment, the outer edge of the shaft sleeve 4 is provided with the engaging portion 47, the shaft sleeve screw hole 45 is disposed on the engaging portion 47, the inner edge of the annular circuit board 2 is provided with the engaging opening 202 matched with the engaging portion 47, the engaging portion 47 is disposed on the engaging opening 202 to position the annular circuit board 2, one end of the inner ring of the shaft sleeve 4 is provided with the guide groove 48, the bottom of the base 1 is provided with the guide ring 102 matched with the guide groove 48, and the guide ring 102 is inserted into the guide groove 48. When the annular circuit board 2 is sleeved on the circuit board positioning table 41, the clamping part 47 and the clamping groove 202 limit the annular circuit board 2; when the shaft sleeve 4 is assembled on the base 1, the guide ring 102 is firstly inserted into the guide groove 48, and then the shaft sleeve screw 40 is used for locking the shaft sleeve 4, so that the accurate and firm installation of the shaft sleeve 4 is ensured.

Based on the above embodiment, the bottom of the base 1 is provided with a plurality of supporting platforms 103 supported on the bottom surface of the annular circuit board 2, a plurality of circuit board mounting holes 104 are arranged between the supporting platforms 103 and the base 1 in a penetrating manner, the annular circuit board 2 is provided with positioning screw holes 203 corresponding to the circuit board mounting holes 104 in a penetrating manner, and the circuit board mounting holes 104 are provided with second positioning screws 204 in threaded connection with the positioning screw holes 203; the stator further comprises an upper coil frame 14 and a lower coil frame 15 which are respectively adjacent to the top surface and the bottom surface of the iron core 5, the upper coil frame 14 and the lower coil frame 15 are fixed on the iron core 5 through winding, a supporting inclined surface 49 is arranged on the outer edge of the shaft sleeve 4 in a surrounding mode, the lower coil frame 15 comprises an annular portion 150 which is sleeved on the shaft sleeve 4, and the bottom end of the annular portion 150 abuts against the supporting inclined surface 49. The annular circuit board 2 is conveniently locked by using a second positioning screw 204 to pass through the circuit board mounting hole 104 arranged at the bottom of the base 1 and then connected with the positioning screw hole 203, the supporting platform 103 and the circuit board positioning platform 41 clamp the annular circuit board 2 tightly, the assembly stability of the annular circuit board 2 is ensured, and the structure is compact; when the iron core 5 is assembled on the iron core positioning table 42, the annular part 150 abuts against the supporting inclined surface 49, so that the assembly of the iron core 5 can be guided and supported, and the accurate assembly of the iron core 5 is ensured.

Based on the above embodiment, the first lead grooves 50 are disposed on both sides of the inner ring of the iron core 5, the second lead grooves 420 communicated with the first lead grooves 50 are disposed on the outer side of the iron core positioning table 42, the lead holes 410 communicated with the second lead grooves 420 are penetratingly disposed on the circuit board positioning table 41, and the lead wires of the winding are led out from the upper side of the iron core 5 and sequentially pass through the first lead grooves 50, the second lead grooves 420, the lead holes 410 to be electrically connected with the annular circuit board 2. The winding lead wire is electrically connected with the annular circuit board 2 through the first lead groove 50, the second lead groove 420 and the lead hole 410, the limited space is fully utilized, and the winding lead wire has the advantages of compact structure and high reliability.

Based on the above embodiment, the outer wall of the rotor shell 6 is divided into the guiding portion 600 and the engaging portion 601 from top to bottom, the guiding portion 600 is in clearance fit with the sleeve hole 30, the engaging portion 601 is in interference fit with the sleeve hole 30, a guiding inclined surface 602 is arranged between the guiding portion 600 and the engaging portion 601, and the sleeve hole 30 is sleeved on the engaging portion 601. When the centrifugal fan blade 3 is assembled on the rotor shell 6, the sleeve-joint hole 30 penetrates from the guide part 600, is guided by the guide inclined plane 602, and then is pressed into the joint part 601, so that the smooth assembly of the centrifugal fan blade 3 is ensured, and the connection strength between the sleeve-joint hole 30 and the joint part 601 is improved.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by the technical solution of the present invention by those skilled in the art are all within the scope of the present invention as defined by the claims.

Claims

1. An outer rotor centrifugal fan comprises a base (1), an annular circuit board (2), a stator, a rotor and centrifugal fan blades (3), and is characterized in that the stator comprises a shaft sleeve (4), an iron core (5) and a winding wound on the iron core (5), a bearing hole (100) communicated with an inner ring of the shaft sleeve (4) is arranged at the bottom of the base (1) in a penetrating manner, the bottom end of the shaft sleeve (4) and the bottom of the base (1) are fixed through a shaft sleeve screw (40) arranged at the bottom of the base (1) in a penetrating manner, a circuit board positioning table (41) is arranged on one side of the outer edge of the shaft sleeve (4), the annular circuit board (2) and the circuit board positioning table (41) are fixed through a plurality of first positioning screws (200) arranged on the annular circuit board (2) in a penetrating manner, an iron core positioning table (42) is arranged on one side of the outer edge of the shaft sleeve (4), iron core (5) suit is in on axle sleeve (4) and with iron core location platform (42) top is adjoined, the rotor includes rotor shell (6), fixed connection be in pivot (7), the fixed connection at rotor shell (6) center circle magnetite (8) in rotor shell (6), centrifugal fan blade (3) include with rotor shell (6) interference fit cup joint hole (30), cup joint hole (30) suit is in on rotor shell (6), axle sleeve (4) inner circle both ends are provided with first bearing groove (43) and second bearing groove (44) respectively, first bearing groove (43) with second bearing groove (44) go up install respectively with first bearing groove (43) with second bearing groove (44) interference fit's first ball bearing (9) and second ball bearing (11), pivot (7) are worn to establish first ball bearing (9) with second ball bearing (11) inner circle interference fit's first ball bearing (9) with second ball bearing (11) On, top surface center is provided with the butt and keeps in the rotor shell (6) prepressing table (60) of covering on first ball bearing (9), second ball bearing (11) downside has overlapped in proper order and has established shell fragment packing ring (12), gasket (16), retaining ring (13) on pivot (7), pivot (7) outer edge one side is provided with draw-in groove (70), retaining ring (13) block is in on draw-in groove (70), shell fragment packing ring (12) butt is in keep under second ball bearing (11) covering with between gasket (16).

2. The external rotor centrifugal fan of claim 1, wherein a plurality of shaft sleeve screw holes (45) are formed in the top end of the shaft sleeve (4), a plurality of base screw holes (101) corresponding to the shaft sleeve screw holes (45) are formed in the bottom of the base (1) in a penetrating manner, the shaft sleeve screws (40) penetrate through the base screw holes (101) and are in threaded connection with the shaft sleeve screw holes (45), a plurality of circuit board screw holes (46) are formed in the circuit board positioning table (41), a plurality of positioning notches (201) corresponding to the circuit board screw holes (46) are formed in the annular circuit board (2) in a penetrating manner, and the first positioning screws (200) penetrate through the positioning notches (201) and are in threaded connection with the circuit board screw holes (46).

3. The external rotor centrifugal fan of claim 2, wherein a clamping portion (47) is disposed on an outer edge of the shaft sleeve (4), the shaft sleeve screw hole (45) is disposed on the clamping portion (47), a clamping opening (202) matched with the clamping portion (47) is disposed on an inner edge of the annular circuit board (2), the clamping portion (47) is disposed on the clamping opening (202) to position the annular circuit board (2), a guide groove (48) is disposed at one end of an inner ring of the shaft sleeve (4), a guide ring (102) matched with the guide groove (48) is disposed at a bottom of the base (1), and the guide ring (102) is inserted into the guide groove (48).

4. The external rotor centrifugal fan according to claim 1, wherein a plurality of supporting platforms (103) supported on the bottom surface of the annular circuit board (2) are arranged at the bottom of the base (1), a plurality of circuit board mounting holes (104) are arranged between the supporting platforms (103) and the base (1) in a penetrating manner, positioning screw holes (203) corresponding to the circuit board mounting holes (104) are arranged in the annular circuit board (2) in a penetrating manner, and second positioning screws (204) in threaded connection with the positioning screw holes (203) are arranged on the circuit board mounting holes (104); the stator still including connect in the neighbour respectively in last line frame (14) and lower line frame (15) of iron core (5) top surface and bottom surface, go up line frame (14) with lower line frame (15) pass through the winding is fixed on iron core (5), axle sleeve (4) outer edge is provided with support inclined plane (49) around, lower line frame (15) are established including the cover annular portion (150) on axle sleeve (4), annular portion (150) bottom butt is in support on inclined plane (49).

5. The external rotor centrifugal fan according to claim 1, wherein first lead grooves (50) are formed in two sides of an inner ring of the iron core (5), second lead grooves (420) communicated with the first lead grooves (50) are formed in the outer side of the iron core positioning table (42), lead holes (410) communicated with the second lead grooves (420) penetrate through the circuit board positioning table (41), and lead wires of the winding are led out from the upper side of the iron core (5) and sequentially pass through the first lead grooves (50), the second lead grooves (420) and the lead holes (410) to be electrically connected with the annular circuit board (2).

6. The external rotor centrifugal fan of claim 1, wherein the outer wall of the rotor shell (6) is divided into a guide portion (600) and a joint portion (601) from top to bottom, the guide portion (600) is in clearance fit with the sleeve hole (30), the joint portion (601) is in interference fit with the sleeve hole (30), a guide inclined surface (602) is arranged between the guide portion (600) and the joint portion (601), and the sleeve hole (30) is sleeved on the joint portion (601).