Fan assembly and assembly method thereof

Abstract

The present application provides a fan assembly, comprising: an impeller, the impeller comprising a middle diaphragm; a motor, the motor comprising an outer rotor and a stator, the outer rotor rotating around the stator; the fan assembly further comprising: a mounting flange, the mounting flange being fixedly connected to the outer rotor so that the mounting flange can be driven to rotate when the outer rotor rotates; the mounting flange is arranged around the outer rotor, wherein the mounting flange has a stopper, a threaded portion and a slot, and the slot is arranged between the threaded portion and the stopper; wherein at least a portion of the middle diaphragm of the impeller can be assembled in the slot, and the remaining portion of the middle diaphragm of the impeller can be assembled on the threaded portion, so that the middle diaphragm can be driven to rotate when the mounting flange rotates, and then the impeller can be driven to rotate. The present application also provides an assembly method of the above-mentioned fan assembly.

Description

Technical Field

[0001] The present application relates to the field of fans, and in particular to a fan assembly for an outer rotor fan and an assembly method thereof. Background Art

[0002] Traditional fans, especially centrifugal fans, are generally driven by inner rotor motors due to their large size, which are called inner rotor fans. In an inner rotor fan, the motor is installed on the side panel of the fan, and the motor shaft extends into the fan to connect with the impeller to drive the impeller to rotate. However, on the one hand, the motor of the inner rotor fan will block one of the air inlets on both sides, affecting the efficiency of the fan; on the other hand, the cantilever mounting structure formed by the impeller is easily affected by external factors when the impeller rotates and cannot maintain balance, resulting in damage to the fan.

[0003] The external rotor fan can solve the above problems. The external rotor fan is to install the external rotor motor inside the fan and connect it to the impeller to drive the impeller to rotate. However, the internal space of the fan is limited, and the positioning and installation space of the impeller and the external rotor motor inside the fan is narrow, making it very difficult to assemble the external rotor motor and the impeller inside the fan. Summary of the invention

[0004] In order to solve the above problems, at least one object of the present application is to provide a fan assembly that is easy to assemble.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the present application provides a fan assembly, which includes: an impeller, the impeller includes a middle diaphragm; a motor, the motor includes an outer rotor and a stator, and the outer rotor rotates around the stator; the fan assembly also includes: a mounting flange, the mounting flange is fixedly connected to the outer rotor so that the mounting flange can be driven to rotate when the outer rotor rotates; the mounting flange is arranged around the outer rotor, wherein the mounting flange has a stop portion, a threaded portion and a slot, and the slot is arranged between the threaded portion and the stop portion; wherein at least a portion of the middle diaphragm of the impeller can be assembled in the slot, and the remaining portion of the middle diaphragm of the impeller can be assembled on the threaded portion, so that when the mounting flange rotates, the middle diaphragm can be driven to rotate, and then the impeller can be driven to rotate.

[0006] According to the above-mentioned first aspect, the threaded portion includes several circles of thread teeth, and the several circles of thread teeth include at least one circle of left thread teeth and at least one circle of right thread teeth, wherein the right thread teeth are closer to the stop portion than the left thread teeth, and the outer diameter of the right thread teeth is larger than the outer diameter of the left thread teeth.

[0007] According to the above first aspect, the left thread teeth and the right thread teeth are tapered thread structures.

[0008] According to the above-mentioned first aspect, the several circles of thread teeth also include at least one circle of tail thread teeth, and the tail thread teeth are arranged between the right thread teeth and the stop portion; wherein the outer diameter of the tail thread teeth is smaller than the outer diameter of a circle of right thread teeth adjacent to the tail thread teeth.

[0009] According to the above first aspect, the slot has opposite side walls, and the opposite side walls are respectively formed by the stopper and the tail thread teeth.

[0010] According to the above first aspect, the middle partition includes a front plate and a rear plate, the rear plate can be assembled in the slot, and the front plate can be fixed on the threaded teeth adjacent to the stopper.

[0011] According to the above first aspect, the outer rotor and the mounting flange are integrally structured.

[0012] According to the above first aspect, a protrusion is provided on the middle partition, and a limiting groove for receiving the protrusion is provided on the stop portion. The limiting groove has an arc structure and the arc structure has the center of the middle partition as the center of the circle.

[0013] According to the first aspect above, the side of each circle of thread teeth in the plurality of circles of thread teeth opposite to the stop portion is an inclined tooth surface, and the inclined tooth surface is inclined toward the stop portion from the tooth root to the tooth tip.

[0014] According to the first aspect above, there is a certain interval between adjacent thread teeth in the plurality of circles of thread teeth to form a spiral groove for accommodating the middle partition plate.

[0015] According to the above first aspect, the thread direction of the threaded portion matches the rotation direction of the motor, so that when the motor is operating in the installation mode, the axial force applied by the threaded portion on the middle partition can push the middle partition to move toward the stop portion.

[0016] According to the above-mentioned first aspect, the fan assembly also includes: a fan housing, the fan housing includes a first air inlet side plate and a second air inlet side plate that are relatively arranged, and the impeller, the motor and the mounting flange are accommodated in the fan housing; wherein the stator includes a stator shaft, the stator shaft is supported by the first air inlet side plate and the second air inlet side plate, and the outer rotor is supported by the stator shaft.

[0017] Another object of the present application is to provide an assembly method for the above-mentioned fan assembly.

[0018] In order to achieve the above-mentioned purpose, the second aspect of the present application is to provide an assembly method for the above-mentioned fan assembly, which comprises the following steps: installing the middle partition of the impeller on the end of the mounting flange opposite to the stop portion; operating the motor in the installation mode, wherein the rotation speed of the motor in the installation mode is set so that the rotation of the motor can drive the impeller and its middle partition to move along the threaded portion toward the stop portion until at least a portion of the middle partition is assembled in the slot, and the remaining portion of the middle partition is assembled on the threaded portion.

[0019] According to the above second aspect, the assembly method also includes: before the middle partition plate of the impeller is mounted on the end of the mounting flange opposite to the stop portion, the motor is placed so that its rotating axis is arranged in the vertical direction and the stop portion of the mounting flange is located below the threaded portion.

[0020] According to the above second aspect, in the installation mode, the rotation speed of the motor is 3000-5000 rpm.

[0021] The fan assembly of the present application is suitable for a centrifugal fan, and the middle partition of the impeller is connected to the outer rotor of the outer rotor motor by installing a flange, so that the middle partition can be positioned and assembled relative to the outer rotor, thereby enabling the motor to drive the impeller to rotate. At the same time, the assembly method of the fan assembly is simple and the assembly time is short. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1A and Figure 1B This is a schematic diagram of the structure of the fan in this application;

[0023] Figure 2A and Figure 2B A schematic structural diagram of an embodiment of a mounting flange in the present application;

[0024] Figure 3A and Figure 3B This is a schematic diagram of the structure after the installation flange and the middle partition are assembled in this application;

[0025] Figure 4 for Figure 3A and Figure 3B A local cross-sectional view along a direction perpendicular to the axis x;

[0026] Figure 5A and Figure 5B Schematic diagram of the assembly process of the middle partition and the mounting flange. DETAILED DESCRIPTION

[0027] Various specific embodiments of the present invention will be described below with reference to the accompanying drawings that form a part of this specification. It should be understood that although terms indicating directions, such as "front", "rear", "upper", "lower", "left", "right", etc., are used in this application to describe various example structural parts and elements of the present application, these terms are used here only for the purpose of convenience of description and are determined based on the example orientations shown in the accompanying drawings. Since the embodiments disclosed in the present application can be set in different directions, these terms indicating directions are only for illustration and should not be regarded as limitations. Where possible, the same or similar figure numbers used in this application refer to the same parts.

[0028] Figure 1A and Figure 1B The structure of the fan assembly 100 is shown in FIG. Figure 1A for Figure 1B A left side view of the fan assembly 100 is shown in FIG. Figure 1B A portion of the vortex plate is omitted in order to illustrate the specific structure inside the fan assembly 100 , and to illustrate the structure of the motor 110 , the mounting flange 120 , and the middle partition plate 102 after being assembled.

[0029] like Figure 1A As shown, the fan assembly 100 has a fan housing 109, and the fan housing 109 includes a first air inlet side plate 106 and a second air inlet side plate 107 (see Figure 1B ) and the vortex plate 112. The first air inlet side plate 106 and the second air inlet side plate 107 (see Figure 1B ) are respectively arranged on two opposite sides of the fan assembly 100 (for example Figure 1B The left and right sides of the blower assembly 100), the vortex plate 112 connects the first air inlet side plate 106 and the second air inlet side plate 107. The first air inlet side plate 106 is provided with a first air inlet 113, and the second air inlet side plate 107 is provided with a second air inlet ( Figure 1A The fan assembly 100 has an air outlet 103 on one side opposite to the vortex plate 112. Thus, the fan assembly 100 can take in air from the first air inlet 113 and the second air inlet on its left and right sides, and discharge air from the air outlet 103. A mounting bracket 108 is provided on the first air inlet side plate 106, and a mounting bracket ( Figure 1A not shown).

[0030] like Figure 1BAs shown, the fan housing 109 contains a motor 110 and an impeller 101. The motor 110 is an outer rotor motor, including an outer rotor 111 and a stator 105, and the outer rotor 111 is supported by the stator 105 and rotates around the stator 105. The stator 105 includes a stator shaft 104, and the outer rotor 111 is supported by the stator shaft 104. Both ends of the stator shaft 104 pass through the first air inlet side plate 106 and the second air inlet side plate 107 on both sides of the motor 110 and are connected to the mounting bracket 108. Thus, the motor 110 is supported on the fan housing 109 by the stator shaft 104, and the outer rotor 111 of the motor 110 can rotate around the stator shaft 104. It should be known to those skilled in the art that in the example shown in the present application, the outer rotor motor is an outer rotor permanent magnet synchronous motor, but in other examples, the motor 110 can also be other types of outer rotor motors.

[0031] An electric control box 162 is connected to the upper part of the vortex plate 112 of the fan housing 109, and the electric control box 162 can output an electric signal to the motor 110 to control the operation and stop of the motor 110. In the example described in the present application, the electric control box 162 and the motor 110 are connected by wires, so that the motor 110 can receive the electric signal. In other examples, the electric control box 162 can also control the motor 110 wirelessly.

[0032] like Figure 1B As shown, the impeller 101 includes a middle partition 102, and the blades ( Figure 1B The fan assembly 100 further includes a mounting flange 120, which is arranged around the outer rotor 111 of the motor 110 and is used to connect the middle partition 102 and the motor 110. Thus, when the outer rotor 111 rotates around the stator shaft 104 along the axial direction indicated by the axis x, the mounting flange 120 rotates with the outer rotor 111 and drives the middle partition 102 to rotate, thereby driving the impeller 101 to rotate, so that the fan assembly 100 takes in air from the air inlet (for example, the first air inlet 113) and then discharges air from the air outlet 103.

[0033] Among them, in Figure 1B In the example shown, the mounting flange 120 is in the shape of a sleeve and is fixedly connected to the outer rotor 111 by sleeve arrangement. In other examples, the mounting flange 120 may also be formed integrally with the outer rotor 111 of the motor, for example, the mounting flange 120 is formed by surface machining of the outer rotor 111. The connection between the mounting flange 120 and the outer rotor 111 only requires that the outer rotor 111 can drive the mounting flange 120 to rotate.

[0034] Figure 2A and Figure 2B An embodiment of the mounting flange 120 is shown in FIG. Figure 2Ais a three-dimensional diagram of the mounting flange 120, Figure 2B It is a side view of the mounting flange 120, used to illustrate the specific structure of the mounting flange 120 from different angles.

[0035] like Figure 2A and Figure 2B As shown, the mounting flange 120 includes a sleeve-shaped main body 218, a substantially disc-shaped stopper 225, and a threaded portion 231 having an external thread. The stopper 225 is connected to the right end of the main body 218, and the threaded portion 231 is arranged on the main body 218 on the left side of the stopper 225, and a slot 223 is formed between the threaded portion 231 and the stopper 225. In the process of assembling the middle diaphragm 102 to the mounting flange 120, the middle diaphragm 102 moves from left to right relative to the mounting flange 120, and moves from the threaded portion 231 to the slot 223. The outer diameter of the stopper 225 is larger than the outer diameter of the main body 218, so that the stopper 225 can prevent the middle diaphragm 102 from moving to the right. It should be noted that in other embodiments, the stopper 225 may not be in the shape of a disc, and it is only necessary to ensure that its outer diameter does not exceed the outer diameter of the middle diaphragm 102, so as not to affect the rotation of the impeller 101. The movement of the middle partition plate 102 described below refers to the movement relative to the mounting flange 120 .

[0036] More specifically, the main body 218 of the mounting flange 120 has an inner wall 214 and an outer wall 215. The inner wall 214 contacts the outer rotor 111 of the motor, and the outer wall 215 has a threaded portion 231. The threaded portion 231 includes a plurality of circles along the circumference of the outer wall 215 with a certain rotation direction (e.g. Figure 2B The thread teeth 234 extend toward the stopper 225 (left-handed rotation direction in the motor 110). It should be known to those skilled in the art that the rotation direction of the threaded portion 231 matches the rotation direction of the motor 110, so that when the middle partition 102 is assembled with the mounting flange 120, the axial force applied by the threaded portion 231 on the middle partition 102 can push the middle partition 102 to move rightward. As an example, the thread teeth 234 have six turns. In other examples, the thread teeth 234 may also have other turns.

[0037] The thread teeth 234 of the mounting flange 120 include at least one circle of left thread teeth 221, at least one circle of right thread teeth 222 and tail thread teeth 224 from left to right. Among them, the right thread teeth 222 are closer to the stopper 225 than the left thread teeth 221, and the tail thread teeth 224 are arranged between the right thread teeth 222 and the stopper 225. The outer diameter of the right thread teeth 222 is larger than the outer diameter of the left thread teeth 221, and the outer diameter of the tail thread teeth 224 is smaller than the outer diameter of a circle of right thread teeth 222 adjacent to the tail thread teeth 224, so that the outer diameter of the thread teeth 234 generally increases first and then decreases in the direction from front to back. As an example, the outer diameters of the left thread teeth 221 and the right thread teeth 222 increase continuously to form a tapered thread structure. In other examples, the outer diameters of the left thread teeth 221 and the right thread teeth 222 may also increase discontinuously, forming a stepped thread structure. Those skilled in the art should know that, in order to facilitate the installation of the middle partition 102 on the left thread teeth 221 and ensure that the middle partition 102 can move toward the right thread teeth 222 when the middle partition 102 and the mounting flange 120 are assembled, the outer diameter of the left thread teeth 221 needs to be no larger than the right thread teeth 222. Although the outer diameter of the tail thread teeth 224 is smaller than the right thread teeth 222, the outer diameter of the tail thread teeth 224 is larger than the outer diameter of the main body 218, so that the tail thread teeth 224 can form a slot 223 together with the stopper 225. It should be noted that, although in the example shown in Figure 2B, a circle of tail thread teeth 224 is shown, the tail thread teeth 224 can also be provided with more than one circle or no tail thread teeth 224.

[0038] like Figure 2B As shown, the thread teeth 234 have a left end face and a right end face, wherein the left end face is an inclined face inclined from the tooth root to the tooth tip toward the stopper 225, and the right end face is a vertical face substantially perpendicular to the main body 218. There is a certain interval between every two adjacent thread teeth 234, for example, interval H. The threaded portion 231 forms a circle of spiral grooves 262 on the outer wall of the main body 218, and the interval H is the width of the spiral grooves 262, wherein the size of the interval H is not less than the width of the middle partition 102, so that the middle partition 102 can be accommodated in the spiral grooves 262. In addition, the right end of the spiral groove 262 is connected to the clamping groove 223, so that when the middle partition 102 moves rightward in the spiral groove 262, it can move into the clamping groove 223 connected to the spiral groove 262.

[0039] In such Figure 2B In the example shown, the locking groove 223 has opposite side walls 2321 and 2322 , wherein the side wall 2321 is formed by the stopper 225 , and the side wall 2322 is formed by the right end surface of the trailing thread teeth 224 .

[0040] Figure 3A and Figure 3B It is a schematic diagram of the structure of the middle partition plate 102 and the mounting flange 120 assembled together, wherein Figure 3A is a three-dimensional diagram of the middle partition plate 102 and the mounting flange 120, Figure 3B for Figure 3A Side view of.

[0041] like Figure 3A and Figure 3B As shown, the middle partition 102 includes a front plate 343 on the left and a rear plate 344 on the right. As an example, the front plate 343 and the rear plate 344 can be formed in one piece or connected by rivets. They are roughly in the shape of a disc with a circular hole (not shown in the figure) in the center. The middle partition 102 passes through the mounting flange 120 through the circular hole in the center (not shown in the figure) and is assembled on the mounting flange 120. Among them, the stopper 225 of the mounting flange 120 is used to prevent the middle partition 102 from moving to the right, and the threaded portion 231 of the mounting flange 120 is used to prevent the middle partition 102 from moving to the left.

[0042] Figure 4 for Figure 3B A portion of the cross-sectional view along the direction perpendicular to the axis x is used to further illustrate the matching relationship between the middle partition plate 102 and the mounting flange 120 after the assembly is completed.

[0043] like Figure 4 As shown, the rear plate 344 of the middle partition plate 102 is accommodated in the slot 223 of the mounting flange 120, and is secured to the rear plate 344 by two side walls 2321 and 2322 of the slot 223 (see Figure 2B ), restricting the movement of the rear plate 344 in the left and right directions, thereby restricting the installation position of the middle partition 102 in the left and right directions relative to the mounting flange 120. At the same time, the front plate 343 of the middle partition 102 keeps biting the left end face of the tail thread teeth 224, so that the rotation of the middle partition 102 relative to the mounting flange 120 requires the middle partition 102 to move in the left and right directions relative to the mounting flange to be realized. Therefore, the middle partition 102 cannot rotate relative to the mounting flange 120. Therefore, when the positional relationship between the middle partition 102 and the mounting flange 120 is as follows Figure 4 As shown, the assembly of the middle diaphragm 102 and the mounting flange 120 is completed, so that the rotation of the mounting flange 120 can drive the middle diaphragm 102 to rotate. The mounting flange 120 is driven by the outer rotor 111 of the motor 110, and the rotation of the middle diaphragm 102 causes the blades to rotate, that is, the motor 110 can drive the impeller 101 to rotate.

[0044] When the torque of the motor 110 is too large, the middle partition 102 bites the tail thread teeth 224, which may cause the tail thread teeth 224 to be overstressed and broken. As an example, the rear plate 344 of the middle partition 102 also has a protrusion 451, and the protrusion 451 is accommodated in the limiting groove 228 on the stopper 225. The protrusion 451 and the limiting groove 228 further limit the assembly of the middle partition 102 and the mounting flange 120, so that after the assembly is completed, the middle partition 102 will not rotate relative to the mounting flange 120. In other examples, the middle partition may not have the protrusion 451, and the mounting flange 120 may not have the limiting groove 228.

[0045] Figure 5A and Figure 5B FIG. 4 shows the assembly process of the mounting flange 120 and the middle partition plate 102 as described above, wherein: Figure 5A Indicates the position of the mounting flange 120 and the middle partition 102 at the beginning of installation. Figure 5B It shows the position of the mounting flange 120 and the middle partition 102 after the installation is completed. Figure 5A and Figure 5B The assembly method of the fan assembly is specifically described.

[0046] First, the motor 110 is assembled into the fan housing 109, so that both ends of the stator shaft 104 of the motor 110 are connected to the first air inlet side plate 106 and the second air inlet side plate 107 of the fan housing 109. And the mounting flange 120 is sleeved on the outer rotor 111 of the motor 110, or the mounting flange 120 is directly processed on the surface of the outer rotor 111.

[0047] The motor 110 (not shown) is then placed with its rotation axis (x-axis) arranged in the vertical direction, so that the stopper 225 of the mounting flange 120 can be located below the threaded portion 231 .

[0048] Then as Figure 5A As shown in FIG. 1 , the impeller 101 including the middle partition plate 102 is mounted on the end of the mounting flange 120 opposite to the stopper 225 (i.e., as shown in FIG. 1 ). Figure 2A and 2B ), so that one end of the mounting flange 120 passes through the circular hole in the center of the middle diaphragm 102. At this time, the middle diaphragm 102 is limited by the thread teeth 234 on the mounting flange 120 and cannot move downward.

[0049] The motor 110 is restarted to operate in the installation mode. The installation mode of the motor 110 will be described in detail later. At this time, the outer rotor of the motor 110 rotates, driving the mounting flange 120 to rotate faster, so that the thread teeth 234 on the threaded portion 231 of the mounting flange exerts an axial force on the middle partition 102 along the mounting flange 120. On the other hand, due to the gravity of the impeller 101 itself, the middle partition 102 is pushed to move along the spiral groove 262 over the thread teeth 234 toward the stopper 225.

[0050] It should be noted that, in the process of the middle partition 102 passing over the thread teeth 234 and moving toward the stopper 225 , the middle partition 102 can be accommodated in the spiral groove 262 and undergoes a certain degree of deformation due to being squeezed.

[0051] Finally, if Figure 5B As shown, the middle partition 102 moves along the spiral groove 262, and finally the rear plate 344 of the middle partition 102 is assembled in the slot 223, and the front plate 343 of the middle partition 102 is assembled on the tail thread teeth 224. At this time, the middle partition 102 rotates with the rotation of the mounting flange 120, and the installation of the fan assembly 100 is completed.

[0052] The motor 110 has a use mode during operation and an installation mode during assembly. By controlling the power supply voltage and control signal of the motor 110, the motor 110 can be operated in the use mode or the installation mode. Among them, when the motor 110 is operated in the installation mode, the torque is much higher than the torque when it is operated in the use mode, so as to overcome the friction torque between the mounting flange 120 and the middle partition 102 and provide the torque required for the thread teeth 234 to overcome the squeezing of the middle partition 102. The running time of the motor 110 in the installation mode is jointly determined by the torque of the motor 110 in the installation mode, the moment of inertia of the impeller 101 and the size of the thread teeth 234, and is based on the synchronous rotation of the motor 110 and the impeller 101 after installation. It should be known to those skilled in the art that the motor 110 can also be placed horizontally as usual, without the need for vertical placement.

[0053] Although the present application will be described with reference to the specific embodiments shown in the accompanying drawings, it should be understood that the fan assembly of the present application can have many variations without departing from the spirit, scope and context of the teachings of the present application. Those skilled in the art will also recognize that there are different ways to change the structural details in the embodiments disclosed in the present application, all falling within the spirit and scope of the present application and claims.

Claims

1. A fan assembly, comprising: An impeller (101), wherein the impeller (101) comprises a middle partition plate (102); A motor (110), the motor (110) comprising an outer rotor (111) and a stator (105), the outer rotor (111) rotating around the stator (105); Characterized in that: the fan assembly also includes: A mounting flange (120), wherein the mounting flange (120) is fixedly connected to the outer rotor (111) so that when the outer rotor (111) rotates, the mounting flange (120) can be driven to rotate; The mounting flange (120) is arranged around the outer rotor (111), wherein the mounting flange (120) has a stopper (225), a threaded portion (231), and a clamping groove (223), and the clamping groove (223) is arranged between the threaded portion (231) and the stopper (225); Part of the middle partition (102) of the impeller (101) can be assembled in the groove (223) to limit the axial movement of the middle partition (102) relative to the mounting flange (120), and the remaining part of the middle partition (102) of the impeller (101) can be assembled on the threaded portion (231) so that when the mounting flange (120) rotates, the middle partition (102) can be driven to rotate, thereby driving the impeller (101) to rotate.

2. The fan assembly according to claim 1, characterized in that: The threaded portion (231) includes several circles of thread teeth (234), and the several circles of thread teeth (234) include at least one circle of left thread teeth (221) and at least one circle of right thread teeth (222), wherein the right thread teeth (222) are closer to the stopper (225) than the left thread teeth (221), and the outer diameter of the right thread teeth (222) is greater than the outer diameter of the left thread teeth (221).

3. The fan assembly according to claim 2, characterized in that: The left thread teeth (221) and the right thread teeth (222) are tapered thread structures.

4. The fan assembly according to claim 2, characterized in that: The plurality of circles of thread teeth (234) further include at least one circle of tail thread teeth (224), wherein the tail thread teeth (224) are arranged between the right thread teeth (222) and the stopper (225); Wherein, the outer diameter of the tail thread teeth (224) is smaller than the outer diameter of a circle of right thread teeth (222) adjacent to the tail thread teeth (224).

5. The fan assembly according to claim 4, characterized in that: The clamping groove (223) has opposite side walls (2321, 2322), and the opposite side walls (2321, 2322) are respectively formed by the stopper (225) and the tail thread teeth (224).

6. The fan assembly according to claim 2, characterized in that: The middle partition (102) comprises a front plate (343) and a rear plate (344); the rear plate (344) can be assembled in the slot (223); and the front plate (343) can be fixed on the threaded teeth (234) adjacent to the stopper (225).

7. The fan assembly according to claim 2, characterized in that: The outer rotor (111) and the mounting flange (120) form an integral structure.

8. The fan assembly according to claim 2, characterized in that: The middle partition plate (102) is provided with a protrusion (451), and the stopper portion (225) is provided with a limiting groove (228) for receiving the protrusion (451), and the limiting groove (228) has an arc-shaped structure with the center of the middle partition plate (102) as the center of the circle.

9. The fan assembly according to claim 2, characterized in that: The side of each circle of thread teeth (234) in the plurality of circles of thread teeth (234) opposite to the stop portion (225) is an inclined tooth surface, and the inclined tooth surface is inclined from the tooth root to the tooth tip toward the stop portion (225).

10. The fan assembly according to claim 2, characterized in that: There is a certain interval between adjacent thread teeth (234) in the plurality of circles of thread teeth (234) to form a spiral groove (262) for accommodating the middle partition plate (102).

11. The fan assembly according to claim 1, characterized in that: The threaded direction of the threaded portion (231) matches the rotation direction of the motor (110), so that when the motor is running in the installation mode, the axial force applied by the threaded portion (231) on the middle partition (102) can push the middle partition (102) to move toward the stop portion (225).

12. The fan assembly according to claim 1, characterized in that: The fan assembly also includes: A fan housing (109), the fan housing (109) comprising a first air inlet side plate (106) and a second air inlet side plate (107) arranged opposite to each other, the impeller (101), the motor (110) and the mounting flange (120) being accommodated in the fan housing (109); The stator (105) comprises a stator shaft (104), the stator shaft (104) is supported by the first air inlet side plate (106) and the second air inlet side plate (107), and the outer rotor (111) is supported by the stator shaft (104).

13. A method for assembling the fan assembly according to claim 1, characterized in that: The assembly method comprises the following steps: The middle partition plate (102) of the impeller (101) is mounted on an end of the mounting flange (120) opposite to the stopper (225); The motor (110) is operated in an installation mode, wherein the rotation speed of the motor (110) in the installation mode is set so that the rotation of the motor (110) can drive the impeller (101) and the middle partition plate (102) to move along the threaded portion (231) toward the stop portion (225) until a portion of the middle partition plate (102) is assembled in the slot (223) and the remaining portion of the middle partition plate (102) is assembled on the threaded portion (231).

14. The method for assembling a fan assembly according to claim 13, characterized in that The assembly method further comprises: Before the middle partition plate (102) of the impeller (101) is mounted on the end of the mounting flange (120) opposite to the stopper (225), the motor (110) is placed so that its rotation axis is arranged in the vertical direction and the stopper (225) of the mounting flange (120) is located below the threaded portion (231).

15. The method for assembling a fan assembly according to claim 13, characterized in that: In the installation mode, the rotation speed of the motor (110) is 3000-5000 rpm.

Images