Mounting structure of outer rotor motor of centrifugal fan

Abstract

The application relates to the technical field of outer rotor motors, in particular to a mounting structure of an outer rotor motor of a centrifugal fan, which comprises a motor shaft, a rotor assembly and a stator assembly, the motor shaft is installed on the rotor assembly, and the stator assembly is installed on the rotor assembly through the motor shaft; the rotor assembly comprises a rotor shell, a magnetic ring is fixedly arranged on the inner circumferential wall of the rotor shell, the motor shaft is arranged at the inner center position of the rotor shell, a wind wheel assembly is arranged on the rotor shell, the wind wheel assembly comprises a wind wheel seat and wind wheel blades; a first bearing seat is arranged in the stator assembly, the stator assembly is sleeved on the motor shaft through the first bearing seat, and a clamping spring is fixed to the end of the motor shaft penetrating the stator assembly; a plurality of locking pieces are arranged on the wind wheel seat, and the locking pieces are connected with the magnetic ring by penetrating the wind wheel seat and the rotor shell in sequence. In the application, when the magnetic ring is damaged, the magnetic ring can be directly disassembled from the rotor shell by opening the locking pieces, the magnetic ring is convenient to replace, and the replacement efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of external rotor motor technology, and in particular to an installation structure for an external rotor motor of a centrifugal fan. Background Technology

[0002] External rotor motors are a common type of AC motor, characterized by simple structure, large torque and high efficiency. The magnetic ring structure of an external rotor motor is a ring-shaped object consisting of a magnetic core and an outer plastic shell, used to generate a strong magnetic field, which can activate other magnetic objects.

[0003] Currently, in some external rotor motors, the magnetic ring in the rotor is installed in the rotor housing by applying glue and using an interference fit. This installation method is cumbersome and inconvenient, and the interference fit may cause compression of the magnetic ring, resulting in damage to the magnetic ring and affecting the normal use of the external rotor motor. However, because glue is used for installation, damaged magnetic rings are not easy to replace. Therefore, further improvements are needed. Utility Model Content

[0004] To facilitate the replacement of damaged magnetic rings inside the stator housing, this application provides an installation structure for the external rotor motor of a centrifugal fan.

[0005] The mounting structure for the external rotor motor of a centrifugal fan provided in this application adopts the following technical solution:

[0006] An installation structure for an external rotor motor of a centrifugal fan includes a motor shaft, a rotor assembly, and a stator assembly. The motor shaft is mounted on the rotor assembly, and the stator assembly is mounted on the rotor assembly via the motor shaft. The rotor assembly includes a rotor housing, with a magnetic ring fixedly disposed on the inner peripheral wall of the rotor housing. The motor shaft is vertically positioned at the center of the rotor housing. A fan assembly is mounted on the rotor housing, and the fan assembly includes a fan seat and fan blades spaced around the fan seat. A first bearing seat is disposed within the stator assembly, and the stator assembly is sleeved on the motor shaft via the first bearing seat. A retaining ring is fixed to the end of the motor shaft passing through the stator assembly, thereby securing the stator assembly to the motor shaft.

[0007] The impeller base is provided with multiple locking components, which pass through the impeller base and rotor housing in sequence and are connected to the magnetic ring.

[0008] In practical use, the locking device passes through the impeller seat and rotor housing until it connects with the magnetic ring, thereby locking the magnetic ring, rotor housing and impeller assembly together, making the connection between the three more stable and increasing the connection stability between the rotor assembly and the impeller assembly. When the magnetic ring is damaged, the locking device can be opened to remove the magnetic ring directly from the rotor housing, which facilitates the replacement of the magnetic ring and improves the replacement efficiency.

[0009] Optionally, the magnetic ring includes multiple permanent magnet parts and multiple connecting parts. The multiple permanent magnet parts are spaced apart from each other, and the multiple connecting parts are respectively disposed between adjacent permanent magnet parts to form a ring structure that fits the inner peripheral wall of the rotor housing. The locking member is connected to the connecting parts.

[0010] The rotor housing has multiple positioning slots at its bottom, and multiple connecting parts have positioning blocks at their bottoms. The positioning slots and positioning blocks are arranged opposite each other, and the positioning blocks can be inserted into the positioning slots for positioning and connection.

[0011] By adopting the above technical solution, the positioning plug can be inserted into the positioning slot for positioning connection, ensuring the accurate installation position of the magnetic ring in the rotor housing, improving the motor assembly progress, improving the stability of the motor during use, and the plug-in setting method eliminates the need for complicated alignment and adjustment processes, thereby improving the efficiency of subsequent magnetic ring replacement.

[0012] Optionally, the outer peripheral wall of the impeller seat has multiple locking grooves facing the magnetic ring along its circumference. Multiple locking members are respectively disposed in the locking grooves. A locking channel is provided at the bottom of the locking groove near the magnetic ring. The locking channel passes through the impeller seat and the rotor housing in sequence, and the bottom of the locking channel extends into the connecting part. A connecting rod is provided in the locking member. The connecting rod passes through the locking member, passes through the locking groove, and is inserted into the connecting part through the locking channel. The locking member can clamp and fix the connecting rod, thereby realizing the fixed connection of the magnetic ring, the rotor housing, and the impeller assembly.

[0013] By adopting the above technical solution, a connecting rod is set up, and the magnetic ring, rotor housing and wind turbine assembly are fixedly connected by the connecting rod, thereby connecting the magnetic ring, rotor housing and wind turbine assembly into a whole, enhancing the connection strength between the magnetic ring, rotor housing and wind turbine assembly, and making the rotor assembly drive the wind turbine assembly to rotate more stably.

[0014] Optionally, the outer peripheral wall of the connecting rod is provided with fine threads, thereby increasing the roughness of the connecting rod and thus increasing the friction between it and the locking member.

[0015] By adopting the above technical solution, the connecting rod is made to have finer threads, which increases the roughness of its outer surface. This increases the friction between the two when it is clamped and fixed by the locking device, making the clamping and locking more secure.

[0016] Optionally, the locking component includes a locking seat, which contains a tension switch and a clamping claw seat. The clamping claw seat is located at the bottom of the locking seat, and the tension switch is located at the top of the locking seat. The bottom of the tension switch is recessed inward to form a limiting part, and the top of the clamping claw seat is located within the limiting part. The connecting rod can pass through the locking seat, the tension switch, and the clamping claw seat into the locking channel. The tension switch and the clamping claw seat can clamp and fix the connecting rod through a clamping action.

[0017] By adopting the above technical solution, when the connecting rod is inserted into the locking seat, and the tension switch and clamping claw seat are sequentially inserted into the locking channel, the magnetic ring, rotor housing and wind turbine assembly are fixedly connected. Then, the connecting rod is locked by the cooperation of the locking switch and the clamping claw seat, thus completing the fixed connection between the magnetic ring, rotor housing and wind turbine assembly.

[0018] Optionally, the locking seat has an internal thread on its inner circumference and the tension switch has an external thread on its outer circumference. The tension switch is inserted into the top of the locking seat for threaded connection, allowing the tension switch to move up and down from the top of the locking seat. When the tension switch moves down, the top of the clamping claw seat abuts against the bottom of the limiting part, thereby clamping and locking the connecting rod passing through both. When the tension switch moves up, the top of the clamping claw seat disengages from the limiting part, thereby unlocking the connecting rod passing through both.

[0019] By adopting the above technical solution, the internal thread on the inner circumference of the locking seat and the external thread on the outer circumference of the tension switch mesh with each other to generate friction and preload, thereby enabling the limiting part to lock or unlock the clamping claw seat.

[0020] Optionally, the clamping jaw seat includes a clamping base, and a plurality of elastic clamping jaw blocks are arranged around the periphery of the top of the clamping base. The plurality of clamping jaw blocks are arranged around the center position of the top of the clamping base, and the space between the plurality of clamping jaw blocks is for the connecting rod to pass through. The top of the clamping base is fixedly connected to the bottom of the plurality of clamping jaw blocks, and the top of the plurality of clamping jaw blocks is located within the limiting part. When the limiting part moves away from the clamping jaw blocks, the top of the plurality of clamping jaw blocks expands outward, and the top of the clamping jaw blocks is always located inside the limiting part.

[0021] By adopting the above technical solution, multiple gripper blocks are used to clamp and fix the connecting rod that passes through the interior. When the bottom of the limiting part at the bottom of the tension switch abuts against the top of the multiple gripper blocks, the top of the multiple gripper blocks retracts inward to clamp the connecting rod. When the bottom of the limiting part at the bottom of the tension switch does not abut against the top of the multiple gripper blocks, the top of the multiple gripper blocks expands outward to release the connecting rod.

[0022] Optionally, the outer peripheral wall of the impeller seat is provided with magnetically oriented closing doors on both sides of the locking groove. The two closing doors can close the locking groove. The closing doors are arc-shaped and adapted to the arc shape of the outer peripheral wall of the impeller seat. The outer peripheral wall of the impeller seat has a closing groove. The closing doors are slidably disposed in the closing groove. A compression spring is provided in the closing groove. One end of the compression spring is fixedly connected to the inside of the closing groove, and the other end of the compression spring is connected to the end of the closing door. When the two closing doors are closed, the compression spring remains in a natural state. When the two closing doors are manually opened, the compression spring contracts and deforms. After the connecting rod is inserted into the locking member, the compression spring automatically resets and pushes the closing door out of the closing groove, thereby closing the locking groove.

[0023] By adopting the above technical solution, the locking slot is opened and closed using an arc-shaped closed door. After the magnetic ring, rotor housing and wind turbine assembly are fixedly connected, the closed door closes, causing the locking slot to close. Since the two closed doors are arc-shaped and match the arc shape of the outer peripheral wall of the wind turbine seat, the wind turbine seat maintains an arc shape when it rotates, reducing air resistance during rotation, reducing energy consumption, and improving the rotation efficiency of the rotor assembly.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. By using a locking device that passes through the impeller seat and rotor housing until it connects with the magnetic ring, the magnetic ring, rotor housing, and impeller assembly are locked together, making the connection between the three more stable and increasing the connection stability between the rotor assembly and the impeller assembly. When the magnetic ring is damaged, the locking device can be opened to remove the magnetic ring directly from the rotor housing, which facilitates the replacement of the magnetic ring and improves the replacement efficiency.

[0026] 2. The positioning blocks can be inserted into the positioning slots for positioning and connection, ensuring the precise installation position of the magnetic ring inside the rotor housing, improving the motor assembly progress and stability during motor use. The plug-in setting eliminates the need for complex alignment and adjustment processes, thereby improving the efficiency of subsequent magnetic ring replacement.

[0027] 3. When the connecting rod is inserted into the locking seat, and the tension switch and clamping claw seat are passed through it in sequence into the locking channel, the magnetic ring, rotor housing and wind turbine assembly are fixedly connected. Then, the connecting rod is locked by the cooperation of the locking switch and the clamping claw seat, thus completing the fixed connection between the magnetic ring, rotor housing and wind turbine assembly. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure in the embodiments of this application.

[0029] Figure 2 This is a cross-sectional view of the locking component in the locked state in the embodiment of this application.

[0030] Figure 3 This is an exploded view of the stator section in an embodiment of this application.

[0031] Figure 4 This is an embodiment of the present application. Figure 2 Enlarged diagram of part A in the middle.

[0032] Figure 5 This is a schematic diagram of the locking component structure in an embodiment of this application.

[0033] Figure 6 This is a cross-sectional view of the structure of the locking member in the unlocked state in the embodiment of this application.

[0034] Figure 7 This is an embodiment of the present application. Figure 6 Enlarged schematic diagram of part B in the middle.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1. Motor shaft; 2. Rotor assembly; 21. Rotor housing; 211. Positioning groove; 22. Magnetic ring; 221. Permanent magnet part; 222. Connecting part; 223. Positioning block; 3. Stator assembly; 31. First bearing seat; 32. Snap ring; 33. Second bearing seat; 4. Wind turbine assembly; 41. Wind turbine seat; 411. Locking groove; 42. Wind turbine blade; 5. Locking element; 51. Connecting rod; 52. Tightening switch; 521. Limiting part; 53. Clamping claw seat; 531. Clamping base; 532. Clamping claw block; 54. Locking seat; 6. Sealing door; 7. Compression spring. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0038] This application discloses an installation structure for an external rotor motor of a centrifugal fan.

[0039] Reference Figure 1 , 2An installation structure for an external rotor motor of a centrifugal fan includes a motor shaft 1, a rotor assembly 2, and a stator assembly 3, wherein the motor shaft 1 is mounted on the rotor assembly 2, and the stator assembly 3 is mounted on the rotor assembly 2 via the motor shaft 1.

[0040] The rotor assembly 2 includes a rotor housing 21. A magnetic ring 22 made of permanent magnet material is fixedly wound around the inner peripheral wall of the rotor housing 21. The motor shaft 1 is vertically positioned at the center of the rotor housing 21. A wind turbine assembly 4 is mounted on the outer peripheral wall of the rotor housing 21. The wind turbine assembly 4 includes a wind turbine seat 41 and wind turbine blades 42. The wind turbine blades 42 are arranged in a circular pattern around the outer peripheral wall of the wind turbine seat 41 at intervals from the center of the wind turbine seat 41. The stator assembly 3 contains a first bearing seat 31 and a second bearing seat 33. The first bearing seat 31 and the second bearing seat 33 are arranged alternately. The first bearing seat 31 is positioned above the motor shaft 1, and the second bearing seat 33 is positioned below the motor shaft 1. The stator assembly 3 passes through the first bearing seat. The first bearing 31 and the second bearing housing 33 are sleeved on the motor shaft 1. The first bearing housing 31 and the second bearing housing 33, which are spaced apart from each other, ensure the concentricity of the stator assembly 3 and guarantee its rotational stability. A retaining ring 32 is fixed to the end of the motor shaft 1 that passes through the stator assembly 3, and the retaining ring 32 is used to fix the stator assembly 3 to the motor shaft 1. When the stator assembly 3 is energized, it generates a rotating magnetic field that drives the magnetic ring 22 to generate a torque, thereby driving the rotor housing 21, the motor shaft 1, and the impeller assembly 4 to rotate. The stator assembly 3 is relatively stationary through the first bearing housing 31. The impeller housing 41 is provided with multiple locking members 5, which pass through the impeller housing 41 and the rotor housing 21 and are connected to the magnetic ring 22. In this embodiment, the stator assembly 3 includes existing technical structures such as the stator core and stator windings, which will not be explained in detail here. Meanwhile, the stator assembly 3 and the magnetic ring 22 are connected by a magnetic levitation air gap, and the air gap between them is 0.2-2mm. In addition, in this embodiment, the stator core inside the stator assembly 3 can be selected as a twelve-slot ten-pole or twelve-slot fourteen-pole structure.

[0041] In actual use, the locking member 5 passes through the impeller seat 41 and the rotor housing 21 until it connects with the magnetic ring 22, thereby locking the magnetic ring 22, the rotor housing 21 and the impeller assembly 4 together, making the connection between the three more stable and increasing the connection stability between the rotor assembly 2 and the impeller assembly 4. When the magnetic ring 22 is damaged, the locking member 5 can be opened to remove the magnetic ring 22 directly from the rotor housing 21, which facilitates the replacement of the magnetic ring 22 and improves the replacement efficiency.

[0042] Reference Figure 2 , 34. Specifically, in this embodiment, the magnetic ring 22 includes multiple permanent magnet parts 221 and multiple connecting parts 222. The length of the connecting parts 222 is less than the length of the permanent magnet parts 221. The multiple permanent magnet parts 221 are spaced apart from each other. The multiple connecting parts 222 are respectively disposed between adjacent permanent magnet parts 221 and integrally formed to form an annular structure that fits the inner peripheral wall of the rotor housing 21. The locking member 5 passes through the impeller seat 41 and the rotor housing 21 and connects to the outer side wall of the connecting part 222 on the magnetic ring 22.

[0043] To more accurately install the magnetic ring 22 onto the inner wall of the rotor housing 21, multiple positioning grooves 211 are provided on the bottom of the rotor housing 21. The multiple positioning grooves 211 are arranged in a circle with the center of the bottom of the rotor housing 21 as the center. Multiple connecting parts 222 are provided with positioning blocks 223 at their bottoms. The multiple positioning grooves 211 and multiple positioning blocks 223 are correspondingly arranged, and the positioning blocks 223 can be inserted into the positioning grooves 211 for positioning and connection.

[0044] In actual use, the positioning plug 223 can be inserted into the positioning slot 211 for positioning connection, ensuring the accurate installation position of the magnetic ring 22 in the rotor housing 21, improving the motor assembly progress, improving the stability of the motor during use, and the plug-in setting method does not require a complicated alignment and adjustment process, thereby improving the efficiency of subsequent replacement of the magnetic ring 22.

[0045] Reference Figure 1 Specifically, in this embodiment, a plurality of locking grooves 411 facing the magnetic ring 22 are provided on the outer peripheral wall of the impeller seat 41. A plurality of locking members 5 are respectively disposed in the locking grooves 411. A locking channel is provided at the bottom of the locking groove 411 near the magnetic ring 22. The locking channel passes through the impeller seat 41 and the rotor housing 21 in sequence, and the bottom of the locking channel extends into the connecting part 222. A connecting rod 51 is provided in the locking member 5. The outer peripheral wall of the connecting rod 51 is provided with fine threads, thereby increasing the roughness of the connecting rod 51 and thus increasing the friction between it and the locking member 5. The connecting rod 51 passes through the locking grooves 411 through the locking member 5 and is inserted into the connecting part 222 through the locking channel. The locking member 5 can clamp and fix the connecting rod 51, thereby realizing the fixed connection of the magnetic ring 22, the rotor housing 21 and the impeller assembly 4.

[0046] In actual use, a connecting rod 51 with fine threads on its outer surface is provided, and the magnetic ring 22, rotor housing 21 and impeller assembly 4 are fixedly connected by the connecting rod 51, thereby connecting the magnetic ring 22, rotor housing 21 and impeller assembly 4 into a whole, enhancing the connection strength between the magnetic ring 22, rotor housing 21 and impeller assembly 4, and making the rotor assembly 2 drive the impeller assembly 4 to rotate more stably.

[0047] Reference Figure 4 , 5 6. Specifically, in this embodiment, the outer peripheral wall of the impeller seat 41 is provided with magnetically oriented closing doors 6 on both sides of the locking groove 411. The top of the locking member 5 is located below the closing door 6, thereby preventing the locking member 5 from affecting the closing of the closing door 6 in the locked state. The two closing doors 6 can close the locking groove 411. The closing door 6 is arc-shaped and matches the arc shape of the outer peripheral wall of the impeller seat 41. The outer peripheral wall of the impeller seat 41 is provided with closing grooves on both sides of the locking end. The closing door 6 can be slidably disposed in the closing groove. A compression spring 7 is provided in the closing groove. One end of the compression spring 7 is fixedly connected to the inside of the closing groove, and the other end of the compression spring 7 is connected to the end of the closing door 6. When the two closing doors 6 are closed and the closing groove is closed, the compression spring 7 remains in a natural state. When the two closing doors 6 are opened manually, the compression spring 7 contracts and deforms. After the connecting rod 51 is inserted into the locking member 5, the compression spring 7 automatically resets and pushes the closing door 6 out of the closing groove, thereby closing the locking groove 411.

[0048] In addition, in order to facilitate the opening of the magnetic closed door 6, a sliding groove is provided on the top of the closed door 6 for easy manipulation by hand.

[0049] In actual use, the locking groove 411 is opened and closed by the arc-shaped closed door 6. After the magnetic ring 22, rotor housing 21 and impeller assembly 4 are fixedly connected, the closed door 6 is closed, so that the locking groove 411 is closed. Since the two closed doors 6 are arc-shaped and match the arc shape of the outer peripheral wall of the impeller seat 41, the impeller seat 41 maintains the arc shape when it rotates, reducing air resistance during rotation, reducing energy consumption, and improving the rotation efficiency of rotor assembly 2.

[0050] Reference Figure 4 , 6 7. Specifically, in this embodiment, the locking member 5 includes a locking seat 54, and a tension switch 52 and a clamping claw seat 53 are provided inside the locking seat 54. The clamping claw seat 53 is located at the bottom inside the locking seat 54, and the tension switch 52 is located at the top inside the locking seat 54. The bottom of the tension switch 52 is recessed inward to form a limiting part 521. The top of the clamping claw seat 53 is located inside the limiting part 521. The limiting part 521 has a trapezoidal cross-section, and the top cross-section of the clamping claw seat 53 also has a trapezoidal structure that matches the limiting part 521, so that when the tension switch 52 is locked, the top of the clamping claw seat 53 and the bottom of the tension switch 52 abut against each other and are fixed. The connecting rod 51 can pass through the locking seat 54, the tension switch 52, and the clamping claw seat 53 into the locking channel. The tension switch 52 and the clamping claw seat 53 can clamp and fix the connecting rod 51 through the clamping action.

[0051] The locking seat 54 has an internal thread on its inner circumference and the tension switch 52 has an external thread on its outer circumference. The tension switch 52 is inserted into the top of the locking seat 54 for threaded connection, so that the tension switch 52 can move up and down from the top of the locking seat 54. When the tension switch 52 moves down, the top of the clamping claw seat 53 and the bottom of the limiting part 521 abut against each other, thereby clamping and locking the connecting rod 51 that passes through the two. When the tension switch 52 moves up, the top of the clamping claw seat 53 disengages from the limiting part 521, thereby unlocking the connecting rod 51 that passes through the two.

[0052] The clamping jaw seat 53 includes a clamping base 531. Multiple elastic clamping jaw blocks 532 are arranged around the periphery of the top of the clamping base 531. The multiple clamping jaw blocks 532 are arranged around the center of the top of the clamping base 531. The space between the multiple clamping jaw blocks 532 is for the connecting rod 51 to pass through. The bottom of the multiple clamping jaw blocks 532 is fixedly connected to the top of the clamping base 531. The top of the multiple clamping jaw blocks 532 is located inside the limiting part 521. When the limiting part 521 moves away from the clamping jaw blocks 532, the top of the multiple clamping jaw blocks 532 expands outward. The top of the clamping jaw blocks 532 is always located inside the limiting part 521.

[0053] In actual use, when the connecting rod 51 is inserted into the locking seat 54 and then passes through the tension switch 52 and the clamping claw seat 53 into the locking channel, thereby fixing the magnetic ring 22, rotor housing 21, and impeller assembly 4, the internal thread on the inner circumference of the locking seat 54 and the external thread on the outer circumference of the tension switch 52 mesh with each other, generating friction and preload, thus the limiting part 521 locks or unlocks the clamping claw seat 53. Simultaneously, multiple clamping claw blocks 532 clamp and fix the connecting rod 51. When the bottom of the limiting part 521 at the bottom of the tension switch 52 abuts against the top of the multiple clamping claw blocks 532, the tops of the multiple clamping claw blocks 532 retract inward to clamp the connecting rod 51. When the bottom of the limiting part 521 at the bottom of the tension switch 52 does not abut against the tops of the multiple clamping claw blocks 532, the tops of the multiple clamping claw blocks 532 expand outward to release the connecting rod 51.

[0054] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. An installation structure for an external rotor motor of a centrifugal fan, characterized in that: The system includes a motor shaft (1), a rotor assembly (2), and a stator assembly (3). The motor shaft (1) is mounted on the rotor assembly (2), and the stator assembly (3) is mounted on the rotor assembly (2) via the motor shaft (1). The rotor assembly (2) includes a rotor housing (21), and a magnetic ring (22) is fixedly disposed on the inner peripheral wall of the rotor housing (21). The motor shaft (1) is vertically disposed at the center position inside the rotor housing (21), and the rotor housing (21) is covered with a... A wind turbine assembly (4) is provided, the wind turbine assembly (4) includes a wind turbine seat (41) and wind turbine blades (42) spaced around the wind turbine seat (41); a first bearing seat (31) is provided in the stator assembly (3), the stator assembly (3) is sleeved on the motor shaft (1) through the first bearing seat (31), and a retaining ring (32) is fixed to the end of the motor shaft (1) that passes through the stator assembly (3), and the retaining ring (32) is used to fix the stator assembly (3) on the motor shaft (1); The impeller seat (41) is provided with a plurality of locking parts (5), which are sequentially passed through the impeller seat (41) and the rotor housing (21) and connected to the magnetic ring (22).

2. The mounting structure of the external rotor motor of a centrifugal fan according to claim 1, characterized in that: The magnetic ring (22) includes multiple permanent magnet parts (221) and multiple connecting parts (222). The multiple permanent magnet parts (221) are spaced apart from each other, and the multiple connecting parts (222) are respectively disposed between adjacent permanent magnet parts (221) to form a ring structure that fits the inner peripheral wall of the rotor housing (21). The locking member (5) is connected to the connecting parts (222). The rotor housing (21) has multiple positioning grooves (211) at its bottom, and multiple connecting parts (222) have positioning blocks (223) at their bottoms. The multiple positioning grooves (211) and multiple positioning blocks (223) are arranged opposite to each other, and the positioning blocks (223) can be inserted into the positioning grooves (211) for positioning and connection.

3. The mounting structure of the external rotor motor of a centrifugal fan according to claim 2, characterized in that: The outer peripheral wall of the impeller seat (41) has multiple locking grooves (411) facing the magnetic ring (22) along its circumference. Multiple locking members (5) are respectively disposed in the locking grooves (411). The bottom of the locking groove (411) near the magnetic ring (22) has a locking channel. The locking channel passes through the impeller seat (41) and the rotor housing (21) in sequence, and the bottom of the locking channel extends into the connecting part (222). A connecting rod (51) is disposed in the locking member (5). The connecting rod (51) passes through the locking groove (411) through the locking member (5) and is inserted into the connecting part (222) through the locking channel. The locking member (5) can clamp and fix the connecting rod (51), thereby realizing the fixed connection of the magnetic ring (22), the rotor housing (21) and the impeller assembly (4).

4. The mounting structure of the external rotor motor of a centrifugal fan according to claim 3, characterized in that: The outer peripheral wall of the connecting rod (51) is provided with fine threads, thereby increasing the roughness of the connecting rod (51) and thus increasing the friction between it and the locking member (5).

5. The mounting structure of the external rotor motor of a centrifugal fan according to claim 3, characterized in that: The locking component (5) includes a locking seat (54), which is provided with a tension switch (52) and a clamping claw seat (53). The clamping claw seat (53) is located at the bottom of the locking seat (54), and the tension switch (52) is located at the top of the locking seat (54). The bottom of the tension switch (52) is recessed inward to form a limiting part (521). The top of the clamping claw seat (53) is located in the limiting part (521). The connecting rod (51) can pass through the locking seat (54), the tension switch (52), and the clamping claw seat (53) into the locking channel. The tension switch (52) and the clamping claw seat (53) can clamp and fix the connecting rod (51) through a clamping action.

6. The mounting structure of the external rotor motor of a centrifugal fan according to claim 5, characterized in that: The locking seat (54) has an internal thread on its inner circumference and the tension switch (52) has an external thread on its outer circumference. The tension switch (52) is inserted into the top of the locking seat (54) for threaded connection, so that the tension switch (52) can move up and down from the top of the locking seat (54). When the tension switch (52) moves down, the top of the clamping claw seat (53) abuts against the bottom of the limiting part (521) to clamp and lock the connecting rod (51) passing through both. When the tension switch (52) moves up, the top of the clamping claw seat (53) disengages from the limiting part (521) to unlock the connecting rod (51) passing through both.

7. The mounting structure of the external rotor motor of a centrifugal fan according to claim 6, characterized in that: The clamping jaw seat (53) includes a clamping base (531). A plurality of elastic clamping jaw blocks (532) are arranged around the top periphery of the clamping base (531). The plurality of clamping jaw blocks (532) are arranged around the center of the top of the clamping base (531). The space between the plurality of clamping jaw blocks (532) is for the connecting rod (51) to pass through. The top of the clamping base (531) is fixedly arranged at the bottom of the plurality of clamping jaw blocks (532). The top of the plurality of clamping jaw blocks (532) is arranged inside the limiting part (521). When the limiting part (521) moves away from the clamping jaw blocks (532), the top of the plurality of clamping jaw blocks (532) expands outward. The top of the clamping jaw blocks (532) is always located inside the limiting part (521).

8. The mounting structure of the external rotor motor of a centrifugal fan according to claim 3, characterized in that: The outer peripheral wall of the impeller seat (41) is provided with magnetically oriented closing doors (6) on both sides of the locking groove (411). The two closing doors (6) can close the locking groove (411). The closing doors (6) are arc-shaped and adapted to the arc shape of the outer peripheral wall of the impeller seat (41). The outer peripheral wall of the impeller seat (41) is provided with a closing groove. The closing doors (6) are slidably disposed in the closing groove. A compression spring (7) is provided in the closing groove. One end of the spring (7) is fixedly connected to the inside of the closed groove, and the other end of the spring (7) is connected to the end of the closed door (6). When the two closed doors (6) are closed together, the spring (7) remains in a natural state. When the two closed doors (6) are opened manually, the spring (7) contracts and deforms. After the connecting rod (51) is inserted into the locking member (5), the spring (7) automatically resets and pushes the closed door (6) out of the closed groove, thereby closing the locking groove (411).

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