Fan assembly and duct type air conditioner

Abstract

The utility model discloses a fan assembly and a duct type air conditioner, and belongs to the technical field of air conditioners. The fan assembly comprises a motor connected with a driving shaft, the driving shaft is provided with an anti-rotation shaft section, and the anti-rotation shaft section is provided with an anti-rotation plane; the centrifugal fan is connected to the driving shaft, a shaft ring is arranged in the middle of the centrifugal fan, and the shaft ring is arranged at the anti-rotation shaft section in a penetrating mode; the first limiting structure and the second limiting structure are arranged on the driving shaft, located on the two sides of the shaft ring correspondingly and used for preventing the centrifugal fan from moving in the axial direction. The duct type air conditioner comprises the fan assembly. According to the fan assembly and the duct type air conditioner, the connection between the shaft and the centrifugal fan is simplified, and the cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioners, in particular to a fan assembly and a ducted air conditioner. BACKGROUND

[0002] The ducted air conditioner belongs to the air conditioner. In the ducted air conditioner, the center of the fan is connected with a shaft sleeve, the outer wall of the shaft sleeve is sleeved with a damping rubber ring, and the shaft sleeve is used for connecting with the motor output shaft or the transmission shaft. This kind of structure form has the problems of complex shaft sleeve structure, more material, high cost. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application provides a fan assembly and a ducted air conditioner, which simplifies the connection of the shaft and the fan and reduces the cost.

[0004] In one aspect of the present application, a fan assembly includes a motor connected with a driving shaft, the driving shaft has an anti-rotation shaft section, and the anti-rotation shaft section is provided with an anti-rotation plane; a centrifugal fan connected to the driving shaft, the centrifugal fan includes a center disc; a plurality of blades connected to the outer peripheral side of the center disc; a shaft ring connected to the middle part of the center disc and extending along the axial direction of the centrifugal fan, the shaft ring is arranged at the anti-rotation shaft section; a first limiting structure and a second limiting structure arranged on the driving shaft and located on the two sides of the shaft ring respectively, for blocking the axial movement of the centrifugal fan.

[0005] In the present application, the centrifugal fan is limited on the driving shaft by the first limiting structure and the second limiting structure, so as to prevent the axial movement of the centrifugal fan relative to the driving shaft, and the rotation of the driving shaft relative to the centrifugal fan is limited by the cooperation of the shaft ring and the anti-rotation shaft section of the driving shaft, so as to realize the connection of the centrifugal fan and the driving shaft. Compared with the structure of connecting the centrifugal fan and the driving shaft by the shaft sleeve in the prior art, the connection structure of the present application is simpler and has lower cost.

[0006] In some embodiments, the fan assembly further includes a fixing member connected to the end of the shaft ring, and the fixing member is provided with a limiting hole matched with the anti-rotation shaft section.

[0007] In the present application, the rotation of the driving shaft relative to the centrifugal fan is limited by the cooperation of the limiting hole of the fixing member and the anti-rotation shaft section of the driving shaft, and in this case, a round hole can be provided on the shaft ring instead of an anti-rotation hole.

[0008] In some embodiments, the shaft ring is provided with a recess, the recess is formed by inward recessing from the end face of the shaft ring; the fixing member includes an end plate provided with a limiting hole, and a limiting part connected with the end plate and inserted into the recess.

[0009] In the application, the limiting portion of the fixing member is inserted into the recess, so that the fixing member is prevented from rotating relative to the centrifugal fan.

[0010] In some embodiments, the centrifugal fan further comprises a middle disc, a shaft ring connected to the middle disc, the shaft ring protruding axially from the middle disc, and a second reinforcing rib connected to the outer periphery of the middle disc and the shaft ring.

[0011] The fixing member comprises an end plate provided with a limiting hole, and a limiting portion connected to the end plate and provided with a limiting slot.

[0012] In the application, the limiting portion of the fixing member is inserted into the second reinforcing rib of the centrifugal fan, so that the fixing member is prevented from rotating relative to the centrifugal fan.

[0013] In some embodiments, the outer periphery of the end plate is circular, and the limiting portion has a plurality of limiting portions distributed along the circumference.

[0014] In the application, the plurality of limiting portions provided on the fixing member can ensure that the connection between the fixing member and the centrifugal fan is uniformly stressed.

[0015] In some embodiments, the limiting portion has an axial length of cooperation with the centrifugal fan of not less than 2 mm.

[0016] In the application, the axial length of cooperation between the limiting portion and the centrifugal fan is set, so that the reliability of the connection between the fixing member and the centrifugal fan can be ensured, and the limiting portion can be prevented from being separated from the centrifugal fan.

[0017] In some embodiments, the fixing member is a metal member, and the thickness Tb of the fixing member satisfies 0.5 mm≤Tb≤4 mm.

[0018] In the application, the thickness of the fixing member is set, so that the structural strength of the fixing member can be ensured, and the influence of the fixing member on the overall weight of the fan assembly can be avoided.

[0019] In some embodiments, the shaft ring is provided with a through portion for the driving shaft to pass through, and the through portion is a circular hole or has a shape corresponding to the anti-rotation shaft segment.

[0020] In the application, since the anti-rotation between the centrifugal fan and the driving shaft can be realized by the cooperation between the fixing member and the driving shaft, the through portion of the centrifugal fan can be set as a circular hole, so that the application range of the centrifugal fan is increased.

[0021] In some embodiments, the first limiting structure is closer to the motor than the second limiting structure, the first limiting structure is a stepped surface provided on the driving shaft, or the first limiting structure is a snap spring clamped on the driving shaft.

[0022] In some embodiments, when the centrifugal fan is connected to the axial center of the drive shaft, the second limiting structure is a retaining ring; when the centrifugal fan is connected to the end of the drive shaft, the second limiting structure is a retaining ring or a nut.

[0023] In another aspect of this application, a ducted air conditioner includes a housing having an air inlet and an air outlet; a heat exchanger disposed within the housing for exchanging heat with air passing through it; and a fan assembly as described above for driving air to flow from the air inlet to the heat exchanger and then blown out from the air outlet. Attached Figure Description

[0024] Figure 1 A schematic diagram of a ducted air conditioner according to some embodiments is shown;

[0025] Figure 2 A cross-sectional view of a ductwork unit according to some embodiments is shown;

[0026] Figure 3 A cross-sectional view of a duct unit according to other embodiments is shown;

[0027] Figure 4 A cross-sectional view of a centrifugal fan and drive shaft in a fan assembly according to some embodiments is shown;

[0028] Figure 5 A cross-sectional view of a centrifugal fan and drive shaft in a fan assembly according to some other embodiments is shown;

[0029] Figure 6 It shows Figure 5 Enlarged view in the middle E direction;

[0030] Figure 7 A schematic diagram of a centrifugal fan and drive shaft in a fan assembly according to some embodiments is shown;

[0031] Figure 8 A partial schematic diagram of a centrifugal fan and drive shaft in a fan assembly according to some embodiments is shown;

[0032] Figure 9 A partial schematic diagram of a centrifugal fan in a fan assembly according to some embodiments is shown;

[0033] Figure 10 A schematic diagram of a drive shaft in a wind turbine assembly according to some embodiments is shown;

[0034] Figure 11 A schematic diagram of a fixture in a wind turbine assembly according to some embodiments is shown;

[0035] Figure 12 A side view of a centrifugal fan and fixture in a fan assembly according to some other embodiments is shown;

[0036] Figure 13 A schematic diagram of a fixture in a wind turbine assembly according to some other embodiments is shown;

[0037] Figure 14 A cross-sectional view of a centrifugal fan and drive shaft in a fan assembly according to some other embodiments is shown;

[0038] Figure 15 A schematic diagram of a drive shaft in a wind turbine assembly according to some other embodiments is shown;

[0039] Figure 16 A cross-sectional view of a centrifugal fan and drive shaft in a fan assembly according to yet another embodiment is shown;

[0040] Figure 17 A partial schematic diagram of a centrifugal fan and drive shaft in a fan assembly according to some embodiments is shown.

[0041] In the above figures, 10 is the casing; 10a is the air outlet; 10b is the air inlet; 11 is the bottom plate; 12 is the top plate; 13 is the middle partition; 141 is the air inlet cavity; 142 is the air outlet cavity; 20 is the fan assembly; 21 is the volute; 21a is the air intake; 21b is the air outlet; 211 is the air outlet section; 22 is the centrifugal fan; 221 is the middle plate; 222 is the blade; 225 is the second reinforcing rib; 23 is the motor; 230 is the drive shaft; 2 31. Output shaft; 232. Drive shaft; 233. Anti-rotation shaft section; 2331. Anti-rotation plane; 234. Stepped surface; 235. Slot; 236. Threaded shaft section; 26. Coupling; 27. Snap ring; 28. Nut; 30. Shaft collar; 30a. Through part; 30d. Recessed part; 40. Fixing part; 44. End plate; 441. Limiting hole; 46. Limiting part; 461. Limiting groove; 462. Limiting claw; 50. Heat exchanger. Detailed Implementation

[0042] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0043] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "multiple" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0046] Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0047] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0048] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0049] The outdoor unit of an air conditioner refers to the part of the refrigeration cycle that includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and an expansion valve can be provided in either the indoor or outdoor unit.

[0050] The indoor and outdoor heat exchangers function as either condensers or evaporators. When the indoor heat exchanger is used as a condenser, the air conditioner functions as a heater in heating mode; when the indoor heat exchanger is used as an evaporator, the air conditioner functions as a cooler in cooling mode.

[0051] The ducted air conditioner described in this application is a type of air conditioner.

[0052] The following reference Figures 1 to 17 The implementation methods of this application are described below:

[0053] Reference Figures 1 to 3 The duct unit according to the embodiments of this application includes a housing 10.

[0054] The housing 10 is generally rectangular in shape, forming the appearance of the duct unit. The housing 10 includes a bottom plate 11 forming the bottom structure, a top plate 12 forming the top structure, and side plates connecting the bottom plate 11 and the top plate 12.

[0055] An air outlet 10a is provided on one side plate of the housing 10. An air inlet 10b is provided on the side of the housing 10 opposite to the air outlet 10a, or an air inlet 10b is provided on the side of the bottom plate 11 of the housing 10 away from the air outlet 10a.

[0056] Indoor air enters the housing 10 through the air inlet 10b and returns to the indoor space through the air outlet 10a.

[0057] The housing 10 is provided with a partition 13. The partition 13 divides the space inside the housing 10 into two chambers, one chamber is the air inlet chamber 141 and the other chamber is the air outlet chamber 142. The air inlet 10b is connected to the air inlet chamber 141 and the air outlet 10a is connected to the air outlet chamber 142.

[0058] The ducted air handling unit includes a fan assembly 20. The fan assembly 20 can be installed inside the air inlet chamber 141.

[0059] The fan assembly 20 may be a centrifugal fan, which includes a volute 21. Intake ports 21a are provided on two sides of the volute 21 perpendicular to its axis. An outlet portion 211 is provided on the volute 21, and an outlet 21b is formed at the end of the outlet portion 211. The outlet portion 211 is the part extending outward from the cylindrical portion of the volute 21.

[0060] The air outlet 211 of the volute 21 is provided with the middle partition 13, or the air outlet 21b of the volute 21 is opposite to the opening on the middle partition 13, so that the air outlet 21b of the volute 21 is connected to the air outlet cavity 142.

[0061] The fan assembly 20 includes a centrifugal fan 22. The centrifugal fan 22 is disposed within the volute 21. Specifically, the centrifugal fan 22 may be disposed within the cylindrical portion of the volute 21.

[0062] The fan assembly 20 may include a motor 23. The motor 23 provides rotational driving force when connected to an external power source. The motor 23 is connected to a drive shaft 230, which is connected to a centrifugal fan 22 to drive the centrifugal fan 22 to rotate.

[0063] When the motor 23 is powered on, the centrifugal fan 22 rotates, causing indoor air to enter the air intake chamber 141 through the air inlet 10b, then flow into the volute 21 through the air suction port 21a, and continue to be blown into the air outlet chamber 142 through the air outlet 21b of the volute 21, and finally delivered into the room through the air outlet 10a.

[0064] The ducted air conditioner includes a heat exchanger 50. The heat exchanger 50 is disposed within the air outlet chamber 142 and located in the air flow path, for exchanging heat with the air passing through it.

[0065] The airflow generated by the centrifugal fan 22 is guided by the volute 21 and flows through the air outlet 21b of the volute 21 to the heat exchanger 50. The air exchanges heat with the refrigerant flowing inside the heat exchanger 50, thereby achieving cooling or heating of the airflow.

[0066] In some embodiments, see specific references Figure 1 The fan assembly 20 includes two centrifugal fans 22. The two centrifugal fans 22 can be arranged at intervals along the length of the partition 13.

[0067] The motor 23 can be located between the two centrifugal fans 22. The motor 23 is a dual-shaft motor 23. The two output shafts 231 of the motor 23 are drive shafts 230, and each of the two drive shafts 230 is connected to a centrifugal fan 22 to drive the centrifugal fan 22 to rotate.

[0068] In some embodiments, refer to Figure 3 The fan assembly 20 includes three centrifugal fans 22. The three centrifugal fans 22 can be arranged at intervals along the length of the partition 13.

[0069] The motor 23 is located between any two adjacent centrifugal fans 22. The first side of the motor 23 has one centrifugal fan 22, and the second side of the motor 23 has two centrifugal fans 22.

[0070] The output shaft 231 on the first side of the motor 23 is a drive shaft 230, and the drive shaft 230 on this side is connected to a centrifugal fan 22.

[0071] The output shaft 231 on the second side of the motor 23 can be connected to the drive shaft 232 via a coupling 26, thereby extending the output shaft 231. The output shaft 231 and the drive shaft 232 on this side constitute the drive shaft 230. The drive shaft 230 is connected to the two centrifugal fans 22 on this side.

[0072] It should be noted that the fan assembly 20 may also include three or more centrifugal fans 22.

[0073] This application improves the connection structure between the drive shaft 230 and the centrifugal fan 22:

[0074] In some embodiments, refer toFigures 4 to 8 The centrifugal fan 22 includes a central plate 221. The outer periphery of the central plate 221 may be circular.

[0075] The centrifugal fan 22 may include blades 222. The blades 222 are connected to the central disk 221. Multiple blades 222 may be arranged along the circumferential direction of the central disk 221. The blades 222 extend along the axial direction of the fan assembly 20, that is, the axial direction of the fan assembly 20 is the length direction of the blades 222.

[0076] The centrifugal fan 22 includes a collar 30 for connection to a drive shaft 230. The collar 30 is located at the center of the centrifugal fan 22. The collar 30 extends axially along the centrifugal fan 22.

[0077] In some embodiments, a collar 30 is connected to the center of a central disk 221. The collar 30 protrudes axially from the central disk 221.

[0078] In some embodiments, in conjunction with reference Figure 9 The collar 30 is provided with a through portion 30a that extends axially for the drive shaft 230 to pass through.

[0079] During assembly, the collar 30 of the centrifugal fan 22 can be fitted onto the drive shaft 230.

[0080] In some embodiments, the fan assembly 20 includes a limiting structure disposed on the drive shaft 230 to prevent the centrifugal fan 22 from moving axially relative to the drive shaft 230.

[0081] The limiting structure includes a first limiting structure and a second limiting structure, which are located on opposite sides of the axial direction of the collar 30 to clamp the centrifugal fan 22 onto the drive shaft 230. The first and second limiting structures can achieve axial limiting of the centrifugal fan 22.

[0082] In some embodiments, the drive shaft 230 is provided with an anti-rotation plane 2331. For ease of description, the shaft segment of the drive shaft 230 provided with the anti-rotation plane 2331 is referred to as the anti-rotation shaft segment 233.

[0083] At least a portion of the through section 30a is adapted to the anti-rotation shaft section 233. Due to the provision of the anti-rotation plane 2331, the drive shaft 230 can be prevented from rotating relative to the centrifugal fan 22, ensuring that the drive shaft 230 can drive the centrifugal fan 22 to rotate together.

[0084] In this embodiment, the centrifugal fan 22 is positioned on the drive shaft 230 by a first limiting structure and a second limiting structure, preventing axial movement of the centrifugal fan 22 relative to the drive shaft 230. The through-hole 30a of the centrifugal fan 22 cooperates with the anti-rotation shaft section 233, restricting rotation of the drive shaft 230 relative to the centrifugal fan 22, thus achieving the connection between the centrifugal fan 22 and the drive shaft 230. Compared to the complexity and high cost of connecting the centrifugal fan 22 and the drive shaft 230 via a bushing in the prior art, the connection structure of this application is simpler and less expensive.

[0085] In some embodiments, refer to Figure 5 and Figure 11 The fan assembly 20 may include a fastener 40. The fastener 40 is connected to the axial end of the collar 30.

[0086] In some embodiments, a fastener 40 is connected to one end of the collar 30.

[0087] In some embodiments, the two ends of the collar 30 are respectively connected to the fasteners 40.

[0088] In some embodiments, the fastener 40 may be a metal part, such as a steel part. The fastener 40 may be a sheet metal part, such as a steel plate.

[0089] In some embodiments, the fastener 40 is sleeved on the drive shaft 230 and limited on the collar 30.

[0090] In some embodiments, the fastener 40 includes an end plate 44. The end plate 44 has a through-hole 441 for the drive shaft 230 to pass through. The end plate 44 abuts against one axial end of the collar 30.

[0091] The shape of the limiting hole 441 corresponds to the shape of the anti-rotation shaft section 233. For example, the anti-rotation shaft section 233 is provided with an anti-rotation plane 2331, the anti-rotation shaft section 233 is D-shaped, and the limiting hole 441 is a D-shaped hole.

[0092] Multiple anti-rotation planes 2331 can also be provided on the anti-rotation shaft section 233. As long as the anti-rotation shaft section 233 is not circular, it can achieve the anti-rotation effect.

[0093] The end plate 44 of the fixing member 40 is installed on the anti-rotation shaft section 233 of the drive shaft 230, so that the drive shaft 230 can drive the fixing member 40 to rotate together. Since the fixing member 40 is connected to the collar 30 of the centrifugal fan 22, the drive shaft 230 can drive the centrifugal fan 22 to rotate together through the fixing member 40.

[0094] Since the fixing member 40 is provided with a limiting hole 441 that cooperates with the anti-rotation shaft section 233, the through part 30a of the collar 30 can be a round hole.

[0095] The through-hole 30a is a round hole that can increase the adaptability of the centrifugal fan 22: the centrifugal fan 22 can be installed on the anti-rotation shaft section 233 of the drive shaft 230 or on the cylindrical shaft section of the drive shaft 230.

[0096] In addition, the fastener 40 can separate the collar 30 of the centrifugal fan 22 from the limiting structure, thus avoiding the problem of easy wear of the collar 30 during long-term use when the limiting structure is in direct contact with the collar 30.

[0097] In some embodiments, the fastener 40 may include a limiting portion 46 connected to the edge of the end plate 44.

[0098] The limiting part 46 is connected to the end plate 44 at an angle. The limiting part 46 is connected to the end plate 44 perpendicularly.

[0099] The limiting part 46 is inserted into the centrifugal fan 22 to achieve radial limiting of the fixing member 40 and the centrifugal fan 22. The limiting structure limits the fixing member 40 and the centrifugal fan 22 axially.

[0100] In some embodiments, refer to Figure 9 The collar 30 has a recessed portion 30d. The recessed portion 30d is formed by recessing inward from the end face of the collar 30. The limiting portion 46 of the fastener 40 is inserted into the recessed portion 30d.

[0101] In some embodiments, refer to Figure 9 and Figure 11 The limiting portion 46 has multiple portions, which are evenly distributed along the outer periphery of the end plate 44; multiple recesses 30d are arranged on the outer periphery of the through portion 30a. For example, in the current view, there are four limiting portions 46 and four recesses 30d.

[0102] In some embodiments, refer to Figure 12 and Figure 13 The centrifugal fan 22 is provided with a second reinforcing rib 225. The second reinforcing rib 225 can be radially connected to the outer periphery of the collar 30, and the second reinforcing rib 225 is connected to the central plate 221. The second reinforcing rib 225 can increase the structural strength of the centrifugal fan 22.

[0103] The second reinforcing rib 225 is roughly triangular in shape. One side of the second reinforcing rib 225 that forms a triangle is connected to the middle plate 221, and the other side of the second reinforcing rib 225 that forms a triangle is connected to the outer periphery of the collar 30.

[0104] The limiting part 46 has a limiting groove 461 in the middle. The limiting groove 461 cooperates with the second reinforcing rib 225 to achieve radial limiting of the limiting part 46 and the centrifugal fan 22.

[0105] The limiting groove 461 extends through the limiting portion 46 in the thickness direction. The limiting groove 461 is open at the free end of the limiting portion 46.

[0106] In some embodiments, the limiting portion 46 is divided into two limiting claws 462 by the limiting groove 461. In the assembled state, the two limiting claws 462 are located on both sides of the second reinforcing rib 225.

[0107] When the drive shaft 230 drives the fixing member 40 to rotate, the limiting claw 462 pushes the second reinforcing rib 225 to rotate together.

[0108] In some embodiments, when the limiting part 46 is installed on the second reinforcing rib 225, the limiting part 46 contacts the outer peripheral surface of the collar 30, which makes the structure of the fastener 40 and the collar 30 more compact. In addition, the collar 30 can also provide support for the limiting part 46 to prevent deformation of the limiting part 46.

[0109] In some embodiments, the limiting portion 46 is in the shape of a cuboid plate and can be formed by bending the edge of the end plate 44.

[0110] In some embodiments, the plane forming the limiting hole 441 on the end plate 44 is arranged parallel to at least one limiting portion 46.

[0111] In some embodiments, the collar 30 is cylindrical, and the end plate 44 is also circular. In the projection of the end face of the collar 30, the end plate 44 does not extend beyond the outer contour line of the collar 30.

[0112] In some embodiments, the axial engagement length between the limiting part 46 and the centrifugal fan 22 is not less than 2 mm.

[0113] Reference Figure 11 In the embodiment where the limiting part 46 is inserted into the recessed part 30d, the axial length of the limiting part 46 is W, where W ≥ 2mm, which ensures effective limiting when the limiting part 46 and the recessed part 30d are engaged. If W < 2mm, the length by which the limiting part 46 penetrates the recessed part 30d is relatively short, and the limiting part 46 can easily disengage from the recessed part 30d.

[0114] In the embodiment where the limiting part 46 cooperates with the second reinforcing rib 225, the axial cooperation length between the second reinforcing rib 225 and the limiting groove 461 is L6. L6 ≥ 2mm ensures effective limiting under the cooperation of the limiting part 46 and the second reinforcing rib 225. If L6 < 2mm, the limiting part 46 can easily disengage from the second reinforcing rib 225.

[0115] In some embodiments, refer to Figure 11The width of the limiting part 46 is H, and H≥2mm, which ensures the structural strength of the limiting part 46. If H<2mm, then the limiting part 46 is relatively thin and is prone to breakage during long-term use.

[0116] In some embodiments, the thickness Tb of the fastener 40 satisfies: 0.5mm ≤ Tb. Within this size range, the structural strength of the fastener 40 can be guaranteed, avoiding the problem of the fastener 40 being too thin and prone to deformation.

[0117] Tb≤4mm. Within this range, the overall weight at the centrifugal fan 22 can be avoided by making the fastener 40 too thick.

[0118] In some embodiments, refer to Figure 15 and Figure 16 The first limiting structure is closer to the motor 23 than the second limiting structure. The first limiting structure can be a stepped surface 234 provided on the drive shaft 230. The outer diameter of the part of the drive shaft 230 that mates with the centrifugal fan 22 is smaller than the outer diameter of the drive shaft 230 body, so as to form a stepped surface 234 on the drive shaft 230.

[0119] One axial end of the collar 30 abuts against the stepped surface 234 to prevent the centrifugal fan 22 from moving.

[0120] In some embodiments, refer to Figure 6 and Figure 10 The first limiting structure is a retaining ring 27 connected to the drive shaft 230.

[0121] The drive shaft 230 is provided with a slot 235, and the retaining ring 27 is engaged in the slot 235. One axial end of the collar 30 abuts against the retaining ring 27 to prevent the centrifugal fan 22 from moving.

[0122] The slot 235 can be an annular groove provided on the outer periphery of the drive shaft 230.

[0123] The snap ring 27 is a thin-walled structure with an opening. The elastic deformation of the thin wall can enlarge the opening, thereby snapping the snap ring 27 from the radial direction of the drive shaft 230 into the slot 235 of the drive shaft 230.

[0124] In some embodiments, the second limiting structure may be a snap ring 27 connected to the drive shaft 230.

[0125] For example, the first limiting structure is a stepped surface 234, and the second limiting structure is a retaining ring 27.

[0126] For example, the first limiting structure is a retaining ring 27, and the second limiting structure is a retaining ring 27.

[0127] The limiting structures in the two examples above are applicable to a fan assembly 20 having two centrifugal fans 22 and to a fan assembly 20 having three or more centrifugal fans 22.

[0128] In other words, the first limiting structure is the stepped surface 234 or the snap ring 27, and the second limiting structure is the snap ring 27. This structure is suitable for the centrifugal fan 22 connected to the middle of the drive shaft 230 in the axial direction, and also suitable for the centrifugal fan 22 near the end of the drive shaft 230.

[0129] In some embodiments, refer to Figure 4 and Figure 16 When the centrifugal fan 22 approaches the end of the drive shaft 230, the second limiting structure can be a nut 28. The nut 28 is screwed onto the drive shaft 230 to prevent the centrifugal fan 22 from moving axially.

[0130] In some embodiments, refer to Figure 17 Nut 28 can be a standard nut or a special nut. The shape of the special nut is different from that of the standard nut.

[0131] When the nut 28 is screwed onto the drive shaft 230, it can clamp the centrifugal fan 22 with the first limiting structure.

[0132] In some embodiments, refer to Figure 15 The part of the drive shaft 230 that mates with the nut 28 is the threaded shaft section 236. The outer diameter of the threaded shaft section 236 is smaller than the outer diameter of the anti-rotation shaft section 233. Because the threaded shaft section 236 is thinner, a smaller nut 28 can be selected, thus avoiding the problem of the nut 28 being too large and heavy.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0134] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A fan assembly, characterized in that, include: An electric motor has drive shafts connected to both ends of its axial direction. The drive shafts have anti-rotation sections, and the anti-rotation sections are provided with anti-rotation planes. Centrifugal fan, including: Mid-game; Multiple blades are connected to the outer periphery of the central disk; A collar is connected to the middle of the central plate and extends along the axial direction of the centrifugal fan; the collar passes through the anti-rotation shaft section. The first limiting structure and the second limiting structure are disposed on the drive shaft and located on both sides of the shaft collar, respectively, to prevent the centrifugal fan from moving axially.

2. The wind turbine assembly according to claim 1, characterized in that, Also includes: A fixing member is connected to the end of the collar, and the fixing member is provided with a limiting hole that cooperates with the anti-rotation shaft section.

3. The wind turbine assembly according to claim 2, characterized in that, The collar is provided with a recessed portion, which is formed by the end face of the collar being recessed inward; The fastener includes: End plate, on which the limiting hole is provided; The limiting part is connected to the end plate and is inserted into the recessed part.

4. The wind turbine assembly according to claim 2, characterized in that, The collar protrudes axially from the central disc; The second reinforcing rib is connected to the outer periphery of the middle plate and the collar; The fastener includes: End plate, on which the limiting hole is provided; A limiting part is connected to the end plate, and a limiting groove is provided on the limiting part, which is adapted to the second reinforcing rib.

5. The wind turbine assembly according to claim 3 or 4, characterized in that, The outer periphery of the end plate is circular, and the limiting part has a plurality of parts evenly distributed along the circumference.

6. The wind turbine assembly according to claim 3 or 4, characterized in that, The axial fitting length between the limiting part and the centrifugal fan is not less than 2mm.

7. The wind turbine assembly according to claim 2, characterized in that, The collar is provided with a through portion for the drive shaft to pass through. The through portion is either a circular hole or has a shape corresponding to the anti-rotation shaft section.

8. The wind turbine assembly according to claim 1, characterized in that, The first limiting structure is closer to the motor than the second limiting structure. The first limiting structure is a stepped surface disposed on the drive shaft, or the first limiting structure is a snap ring that is snapped onto the drive shaft.

9. The wind turbine assembly according to claim 8, characterized in that, When the centrifugal fan is connected to the axial middle of the drive shaft, the second limiting structure is a retaining ring; when the centrifugal fan is connected to the end of the drive shaft, the second limiting structure is a retaining ring or a nut.

10. A ducted air conditioner, characterized in that, include: The housing has an air inlet and an air outlet. A heat exchanger, located inside the housing, is used to exchange heat with the air passing through it; The fan assembly as described in any one of claims 1-9 is used to drive air from the air inlet to the heat exchanger and then blow it out from the air outlet.

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