Ducted air conditioner

Abstract

Provided in some embodiments of the present application is a ducted air conditioner, comprising an indoor unit. The indoor unit comprises: a casing, which has a casing accommodating cavity formed therein; an indoor heat exchanger, which is arranged in the casing accommodating cavity; a plurality of centrifugal fans, which are coaxially arranged in the casing accommodating cavity in a lengthwise direction of the casing, each centrifugal fan comprising: a volute arranged in the casing accommodating cavity and connected to the casing, and an impeller rotatably arranged within the volute; a motor bracket, which is arranged between the plurality of centrifugal fans and fixed relative to the casing; and a fan motor, which comprises an inner stator, an outer rotor, and a motor cover connected to the inner stator and covering the outer periphery of the outer rotor, wherein the motor cover is arranged on the motor bracket, and the outer peripheral surface of the motor cover vertically abuts against the motor bracket.

Description

Ductless air conditioner

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202510114377.8, filed on January 23, 2025; Chinese patent application No. 202510114381.4, filed on January 23, 2025; and Chinese patent application No. 202510114433.8, filed on January 23, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] Some embodiments of this application relate to the field of air conditioning equipment technology, and in particular to a ducted air conditioner. Background Technology

[0004] Ductless air conditioning, also known as air conditioner, refers to equipment that uses artificial means to adjust and control parameters such as temperature, humidity, and airflow rate of the air in a building or structure.

[0005] Currently, more and more people are choosing to install ducted air conditioners indoors to regulate the temperature of the indoor air.

[0006] In related technologies, ducted air conditioners often use a motor to drive a fan to rotate, providing circulating air to the indoor heat exchanger to complete heat exchange. However, the motor is located on one side of multiple fans, and the distance between each fan and the motor is different, which makes the torque transmitted by the motor to each centrifugal fan different. This results in differences in the rotation efficiency of each centrifugal fan, which in turn leads to uneven air output from the ducted air conditioner. Summary of the Invention

[0007] Some embodiments of this application disclose a ducted air conditioner that can reduce the distance between each centrifugal fan and the fan motor, reduce the difference in rotation efficiency among multiple centrifugal fans, reduce the difference in rotation among multiple centrifugal fans, and solve the problem of uneven air output of the ducted air conditioner.

[0008] Some embodiments of this application provide a ducted air conditioner, including: an indoor unit, the indoor unit comprising: a casing, the casing having a casing air inlet and a casing air outlet, and a casing receiving cavity formed within the casing; an indoor heat exchanger, the indoor heat exchanger being disposed within the casing receiving cavity, the indoor heat exchanger being used to exchange heat with the flowing air; a plurality of centrifugal fans, the plurality of centrifugal fans being coaxially disposed within the casing receiving cavity along the length direction of the casing, each centrifugal fan comprising: a volute, the volute being disposed within the casing receiving cavity and connected to the casing; an impeller, the impeller being rotatably disposed within the volute; and a motor bracket, the motor bracket being disposed between the plurality of centrifugal fans and relative to the casing. The system includes: a housing; a fan motor for driving the impellers of the centrifugal fans to rotate synchronously; the fan motor comprising: an inner stator; an outer rotor surrounding the inner stator and rotatable relative to the inner stator; a motor cover connected to the inner stator and covering the outer periphery of the outer rotor, the motor cover mounted on a motor support, the outer peripheral surface of the motor cover abutting against the motor support in a vertical direction; an end cover connected to the outer rotor; and a rotating shaft connected to the end cover and respectively drivingly connected to the impellers of the centrifugal fans to drive the impellers to rotate synchronously when the outer rotor rotates.

[0009] In this way, the motor bracket is set between multiple centrifugal fans, and the motor housing of the fan motor is set on the motor bracket, so that the fan motor and the motor bracket are located together between multiple centrifugal fans. This reduces the distance between the impellers of multiple centrifugal fans and the fan motor. The distance between the impellers of centrifugal fans that were originally far from the fan motor and the fan motor is greatly shortened, reducing the distance of the torque transmission path and reducing the difference in rotation between the impellers of multiple centrifugal fans, thereby improving the uniformity of air output of the indoor unit.

[0010] Furthermore, in the previous design where the fan motor was mounted on the side of the motor bracket, the fan motor's center of gravity was located on one side of the bracket, and the fan motor was only supported by fasteners, resulting in low connection stability. In this embodiment, however, the fan motor is mounted on the motor bracket via a motor housing, with the outer circumference of the housing abutting against the bracket vertically. This places the fan motor's center of gravity above the bracket, allowing the bracket to provide upward support without the need for fasteners, thus making the fan motor's mounting structure more stable.

[0011] In some embodiments of this application, the indoor unit includes: a casing, the casing having a casing air inlet and a casing air outlet, and a casing receiving cavity formed within the casing; an indoor heat exchanger, the indoor heat exchanger being disposed within the casing receiving cavity, the indoor heat exchanger being used to exchange heat with the flowing air; and a plurality of centrifugal fans, the plurality of centrifugal fans being coaxially disposed within the casing receiving cavity along the length direction of the casing, each centrifugal fan including: a volute, the volute being disposed within the casing receiving cavity and connected to the casing; an impeller, the impeller being rotatably disposed within the volute; a motor bracket, the motor bracket being disposed between the plurality of centrifugal fans and fixed relative to the casing; and a fan motor. The fan motor is used to drive the multiple impellers of the plurality of centrifugal fans to rotate synchronously. The fan motor includes: an inner stator; an outer rotor, which is arranged around the inner stator and can rotate relative to the inner stator; a motor cover, which is connected to the inner stator and covers the outer periphery of the outer rotor, and is disposed on the motor bracket. The centerline of the width of the fan motor along its axial direction corresponds vertically to the motor bracket; an end cover, which is connected to the outer rotor; and a rotating shaft, which is connected to the end cover and is respectively drivenly connected to the multiple impellers of the plurality of centrifugal fans to drive the multiple impellers to rotate synchronously when the outer rotor rotates.

[0012] In this way, when the centerline of the fan motor's width along its axial direction aligns with the vertical direction of the motor bracket, it means that the motor bracket supports the fan motor, ensuring stable operation of the fan motor after it is installed on the bracket. Furthermore, this prevents the motor bracket from bending to one side under the weight of the fan motor due to a vertical misalignment between the fan motor's centerline and the motor bracket, thus extending the service life of the motor bracket.

[0013] In some embodiments of this application, the center of gravity of the fan motor is located above the motor bracket.

[0014] Thus, since the center of gravity of the fan motor is located above the motor bracket, the force exerted by the fan motor on the motor bracket is vertically downward. This prevents the motor bracket from tilting to one side, ensuring the stable operation of the fan motor and avoiding the situation where the motor bracket would tilt to one side under the weight of the fan motor if the center of gravity of the fan motor were located on the side of the motor bracket.

[0015] In some embodiments of this application, the impellers located on both sides of the fan motor are spaced at the same distance from the fan motor along the axial direction of the rotating shaft.

[0016] This ensures that when the outer rotor of the fan motor rotates, the torque transmitted to the impellers on both sides travels the same path length, ensuring that the impellers on both sides of the fan motor receive the same torque, thereby ensuring that the impellers can rotate synchronously and with the same rotational efficiency, which further ensures uniform airflow from the indoor unit.

[0017] In some embodiments of this application, the housing includes: a top plate for fixing to the top of an indoor space; a bottom plate opposite to the top plate along the height direction of the housing; a partition disposed within the housing cavity and connected between the top plate and the bottom plate, the partition dividing the housing cavity into an air inlet cavity and an air outlet cavity, the air inlet cavity communicating with the air inlet of the housing, the air outlet cavity communicating with the air outlet of the housing, and a plurality of centrifugal fans coaxially disposed within the air inlet cavity along the length direction of the housing; and a motor bracket connected to the partition and the bottom plate.

[0018] In this way, both the partition and the base plate can serve as the foundation for the motor bracket. The motor bracket, connected to the partition and base plate, forms a triangular support structure, enhancing the overall structural strength of the indoor unit and making the ducted air conditioner more stable and reliable during installation and use. Furthermore, this helps reduce the vibration and noise generated by the fan motor on the motor bracket, improving the operational smoothness of the ducted air conditioner.

[0019] In some embodiments of this application, the motor bracket includes: a base connected to the partition and the bottom plate; a cover plate disposed above the base, a motor receiving cavity formed between the cover plate and the base, and a motor cover fixedly disposed within the motor receiving cavity.

[0020] Thus, the motor housing cavity formed between the cover plate and the base plate is a stable support structure, providing a solid foundation for the fan motor, enhancing the load-bearing capacity of the motor bracket, ensuring the stability of the fan motor during operation, and reducing vibration and noise. Furthermore, the fan motor's placement within the housing cavity also provides some protection, reducing the impact of external factors on the fan motor.

[0021] In some embodiments of this application, the base includes: a plastic seat body connected to the partition and the bottom plate; a sheet metal support plate disposed on the plastic seat body, and the cover plate and the sheet metal support plate forming the motor receiving cavity.

[0022] In this way, by setting a sheet metal support plate on the plastic base, the motor housing of the fan motor is in direct contact with the sheet metal support plate, providing additional support for the fan motor, effectively enhancing the overall load-bearing capacity of the base, and improving the durability and service life of the base.

[0023] In some embodiments of this application, the outer peripheral surface of the motor cover is an outer cylindrical surface, and the inner wall of the motor receiving cavity is an inner cylindrical surface, wherein the outer cylindrical surface and the inner cylindrical surface are adapted to each other.

[0024] This ensures a tight fit between the motor housing and the motor housing cavity, allowing the motor housing to be enclosed by the inner wall of the motor housing cavity. This helps prevent the fan motor from wobbling or shifting radially along the shaft during operation, reducing vibration and noise during operation and improving the smoothness of the fan motor's operation.

[0025] In some embodiments of this application, the sheet metal support plate includes: a limiting flange, the limiting flange being located on both sides of the fan motor along the axial direction of the rotating shaft.

[0026] This prevents the fan motor from detaching from the motor housing, effectively restricts the axial movement of the fan motor, and ensures that it will not be displaced due to vibration or external forces during operation, thereby enhancing the stability and fixation of the entire system.

[0027] In some embodiments of this application, the plastic seat is provided with a first connecting part and a first positioning part; the sheet metal support is provided with a second connecting part and a second positioning part; the first connecting part and the second connecting part are connected by fasteners; the plastic seat and the sheet metal support are pre-positioned by the first positioning part and the second positioning part.

[0028] Thus, the first and second connecting parts are connected by fasteners, ensuring a stable connection between the plastic base and the sheet metal support plate. This connection method is simple and reliable, and can withstand large tensile and shear forces, thereby ensuring the structural strength of the entire base.

[0029] Furthermore, the design of the first and second positioning parts allows for pre-positioning of the plastic base and the sheet metal support plate before assembly. This pre-positioning method helps to quickly and accurately determine their relative positions, thereby simplifying the assembly process and improving assembly efficiency. The pre-positioning structure ensures precise alignment of the plastic base and the sheet metal support plate during assembly, preventing performance degradation or damage caused by assembly errors. This contributes to improving the assembly accuracy and reliability of the entire motor bracket.

[0030] In some embodiments of this application, the first connecting portion includes a threaded hole; the first positioning portion includes a positioning post; the second connecting portion includes a connecting hole; the second positioning portion includes a positioning hole; the fastener is a screw, the fastener passes through the connecting hole and connects to the threaded hole; the positioning post passes through the positioning hole.

[0031] Thus, the use of screw connections and the matching of positioning holes and positioning pins makes the installation process simple and quick. Installers only need to insert the positioning pins into the positioning holes, and then use screws to fix them through the connecting holes and threaded holes to complete the installation of the plastic base and sheet metal support plate. No complicated adjustments and calibrations are required, which not only simplifies the installation steps but also shortens the installation time.

[0032] In some embodiments of this application, the base further includes: a first sidewall; a second sidewall, the second sidewall and the first sidewall being located on opposite sides of the motor receiving cavity along the axial direction of the rotating shaft, the upper surfaces of the first sidewall and the second sidewall both having notches, the notches penetrating the first sidewall and the second sidewall along the axial direction of the rotating shaft to avoid the rotating shaft; the motor bracket further includes: a first reinforcing member, the first reinforcing member having a first end and a second end, the first end and the second end of the first reinforcing member being connected to the upper surface of the first sidewall and respectively located on opposite sides of the notch along the width direction of the housing; a second reinforcing member, the second reinforcing member having a third end and a fourth end, the third end and the fourth end of the second reinforcing member being connected to the upper surface of the second sidewall and respectively located on opposite sides of the notch along the width direction of the housing.

[0033] Thus, the first reinforcing member connected to both sides of the notch along the width direction of the casing connects the base on both sides of the notch, forming a complete structure. This enhances the structural strength of the base, helps maintain its stability and integrity, and prevents deformation or damage due to insufficient structural strength. Through the first and second reinforcing members, both sides of the notch in the first and second sidewalls are connected to form a complete structure, providing support on both sides of the base along the axial direction. This further enhances the rigidity of the base, preventing deformation due to stress during long-term use and ensuring the stability and reliability of the fan motor.

[0034] In some embodiments of this application, the base is provided with a through hole that extends through the base along the axial direction of the rotating shaft.

[0035] In this way, by opening a through hole along the axial direction on the base, the area of ​​the motor bracket that obstructs airflow in the axial direction is reduced, thereby reducing the obstruction of the air inlet of the centrifugal fan and reducing the impact on the air intake of the centrifugal fan.

[0036] In some embodiments of this application, the indoor unit further includes a shock absorber disposed between the inner wall surface of the motor receiving cavity and the outer peripheral surface of the motor cover.

[0037] In this way, the vibration generated by the fan motor can be effectively absorbed, thereby reducing the interference of vibration on the surrounding environment and other components in the indoor unit. By reducing vibration, the shock absorber can also significantly reduce noise caused by vibration, improving the user experience.

[0038] In some embodiments of this application, the impeller includes: a hub having a central hole; blades connected to the outer periphery of the hub; and a shaft connected to the central holes of a plurality of hubs respectively by fasteners.

[0039] In this way, the shaft is connected to the center hole of the hub via fasteners, allowing torque to be transmitted directly and efficiently to each impeller. This design reduces intermediate transmission links, which not only simplifies the structure of the indoor unit but also reduces energy loss during transmission, improving the overall energy transfer efficiency of the system. Furthermore, it helps reduce torque dispersion and loss during transmission, improving the efficiency of the entire centrifugal fan system.

[0040] In some embodiments of this application, the impeller further includes a reinforcing structure disposed on the hub and surrounding the central hole of the hub.

[0041] This effectively enhances the overall structural strength and rigidity of the impeller. During high-speed rotation, the impeller needs to withstand enormous centrifugal force and other mechanical stresses. The reinforced structure ensures that the impeller does not deform or break under these stresses, thereby improving its stability and durability. Furthermore, the reinforced structure optimizes the stress distribution inside the impeller, helping to reduce stress concentration and lowering the risk of damage caused by excessive stress during rotation.

[0042] In some embodiments of this application, the rotating shaft and the end cover are integrally formed; the fan motor further includes: a stator bearing, the stator bearing being disposed at the center of the inner stator, and the rotating shaft passing through the stator bearing.

[0043] This design makes the connection between the shaft and the end cover more secure, reducing the risk of loosening or damage due to improper connection. The tighter connection between the shaft and the end cover also reduces friction and energy loss caused by gaps. This helps improve the operating efficiency of the fan motor and reduce energy consumption. The stator bearing, located at the center of the inner stator, effectively supports the inner stator, ensuring its stability during rotation. Simultaneously, the stator bearing also acts as a positioning element, ensuring that the relative position between the shaft and the inner stator does not change, resulting in smoother fan motor rotation. Furthermore, the stator bearing can withstand the centrifugal force and friction generated by high-speed rotation, supporting the inner stator while reducing friction between the shaft and the inner stator, ensuring the stability and reliability of the fan motor during high-speed operation. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in some embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 is a structural schematic diagram of a ducted air conditioner disclosed in some embodiments of this application from one perspective.

[0046] Figure 2 is a structural schematic diagram of the ducted air conditioner disclosed in some embodiments of this application from another perspective;

[0047] Figure 3 is a rear view of an indoor unit disclosed in some embodiments of this application;

[0048] Figure 4 is a top view of an indoor unit disclosed in some embodiments of this application;

[0049] Figure 5 is an exploded view of an indoor unit disclosed in some embodiments of this application;

[0050] Figure 6 is a cross-sectional view of AA in Figure 3;

[0051] Figure 7 is a cross-sectional view of BB in Figure 4;

[0052] Figure 8 is a magnified view of part A in Figure 7;

[0053] Figure 9 is an exploded view of a fan motor disclosed in some embodiments of this application from one perspective.

[0054] Figure 10 is an exploded view of a fan motor disclosed in some embodiments of this application from another perspective;

[0055] Figure 11 is a schematic diagram of the structure of the motor bracket disclosed in some embodiments of this application;

[0056] Figure 12 is an exploded view of a motor bracket disclosed in some embodiments of this application;

[0057] Figure 13 is a schematic diagram of the structure of the plastic base disclosed in some embodiments of this application;

[0058] Figure 14 is a schematic diagram of the structure of the sheet metal pallet disclosed in some embodiments of this application;

[0059] Figure 15 is a schematic diagram of the structure of the first reinforcing member disclosed in some embodiments of this application;

[0060] Figure 16 is an exploded view of the fan motor and motor bracket after installation, as disclosed in some embodiments of this application;

[0061] Figure 17 is a schematic diagram of the structure of an impeller disclosed in some embodiments of this application.

[0062] Explanation of reference numerals in the attached drawings: 100-Ductless air conditioner; 101-Indoor unit; 1-Casing; 1a-Casing air inlet; 1b-Casing air outlet; 10-Casing housing cavity; 10a-Air inlet cavity; 10b-Air outlet cavity; 11-Top plate; 12-Bottom plate; 13-Partition plate; 2-Indoor heat exchanger; 3-Centrifugal fan; 31-Voltage casing; 32-Impeller; 321-Hub; 322-Blade; 323-Reinforcing structure; 4-Motor bracket; 4a-Motor housing cavity; 41-Base; 41a-Notch; 41b-Through hole; 411-Plastic base; 4111-First connecting part; 4112- First positioning part; 412-Sheet metal support plate; 4121-Limiting flange; 4122-Second connecting part; 4123-Second positioning part; 413-First side wall; 414-Second side wall; 42-Cover plate; 43a-First reinforcing member; 43b-Second reinforcing member; 431-First end; 432-Second end; 433-Third end; 434-Fourth end; 435-Reinforcing flange; 5-Fan motor; 51-Inner stator; 52-Outer rotor; 53-Motor outer cover; 54-End cover; 55-Stator bearing; 6-Shaft; 7-Shock absorber; X-Length direction; Y-Width direction; Z-Height direction. Detailed Implementation

[0063] The technical solutions of some embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0064] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0065] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0066] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0067] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0068] With the improvement of living standards and the change of aesthetic concepts, people are no longer satisfied with just the basic performance of air conditioners, but pay more attention to the coordination and unity of their appearance with the interior decoration style, cost performance, and the aesthetics of their installation with the indoor environment.

[0069] Ductless air conditioners, as one of the many types of air conditioners, typically feature an embedded design, with the indoor unit concealed within the ceiling, only the supply and return air vents visible in the room. This concealed installation not only avoids the space-consuming nature of traditional air conditioners but also maintains the overall aesthetic appeal of the interior design. Furthermore, ductless air conditioners are suitable for various apartment layouts and decorating styles. Whether it's a small or large apartment, a modern minimalist style or a classic Chinese style, ductless air conditioners can blend seamlessly with the interior design. In addition, ductless air conditioners can also meet the different temperature and humidity needs of different rooms through zone control. Therefore, ductless air conditioners, with their high aesthetic appeal, strong adaptability, and cost-effectiveness, have become an increasingly popular choice for air conditioners.

[0070] Ductless air conditioners contain heat exchange components, fans, and motors within their indoor units. The motor drives the fans to rotate, drawing air from outside the unit through the air inlet. After airflow from the fan and heat exchange in the indoor heat exchanger, the air is then discharged into the room through the air outlet. In related technologies, ductless air conditioner indoor units typically use internal rotor motors to drive multiple centrifugal fans. Internal rotor motors are DC motors with permanent magnets on the rotor and coils on the stator. The rotor and stator of an internal rotor motor are usually tightly coupled, forming a single unit. Internal rotor motors are driven by electromagnetic induction, resulting in significant vibration and noise due to changes in electromagnetic force within the motor. During operation, the rotor temperature rises, and because the rotor is located inside the motor, the heat dissipation performance of internal rotor motors is relatively poor. Furthermore, in the related technology, the internal rotor motor is located on one side of multiple centrifugal fans along the length of the air conditioner. As the driving source for the rotation of multiple centrifugal fans, the internal rotor motor has different spacing between each centrifugal fan and the internal rotor motor. When the internal rotor motor rotates, the centrifugal fan closer to the internal rotor motor will receive torque first and then rotate. The centrifugal fan farther from the internal rotor motor may experience some torque loss due to the long torque transmission distance. This results in different rotational efficiencies between the centrifugal fans farther from the internal rotor motor and those closer to the internal rotor motor, leading to uneven airflow in the ducted air conditioner and affecting the user experience.

[0071] Based on this, some embodiments of this application provide a duct-type air conditioner that uses an external rotor motor and places the fan motor and the motor bracket for mounting the fan motor between multiple centrifugal fans. This reduces the distance between the centrifugal fans and the fan motor, thereby shortening the path for the fan motor to transmit torque to the centrifugal fans. This reduces the difference in rotational efficiency among the multiple centrifugal fans, thereby reducing the deterioration of the user experience caused by uneven airflow.

[0072] The present technical solution will be further described below with reference to the embodiments and accompanying drawings.

[0073] Please refer to Figures 1 and 2. One embodiment of this application provides a ducted air conditioner 100, which includes an indoor unit 101. The indoor unit 101 is an important component of the ducted air conditioner 100 and performs an air conditioning cycle by using an air supply system and a related heat exchange system. This cycle encompasses a series of processes, including air intake, heat exchange, airflow propulsion, and temperature regulation, thereby providing a suitable temperature and air quality for the indoor space. A strong airflow is generated by the air supply system to draw indoor air into the ducted air conditioner. The intake air then flows through the heat exchange system to absorb heat from the air, achieving a cooling effect, and transfers the heat to the refrigerant through the heat exchange process. The cooled air, after heat exchange, is pushed back into the indoor space by the air supply system, forming a cycle. Through this cycle, the temperature of the indoor space is regulated, and the indoor air quality is improved through airflow circulation, providing users with a comfortable and healthy indoor environment. In this embodiment, the indoor unit 101 is mounted on the ceiling of the room.

[0074] Referring to Figures 2 and 4, the indoor unit 101 includes a casing 1, within which a casing cavity 10 is formed, and components such as a condenser are arranged within the casing cavity 10. The casing 1 is provided with a casing air inlet 1a and a casing air outlet 1b. The casing air inlet 1a is used to guide airflow into the interior of the casing 1, and the casing air outlet 1b is used to guide airflow into the room.

[0075] As shown in Figures 5 and 6, the indoor unit 101 also includes an indoor heat exchanger 2, which is disposed within the housing cavity 10. The indoor heat exchanger 2 is used to exchange heat with the flowing air. It utilizes the characteristic that liquid low-temperature refrigerant easily evaporates under low pressure, absorbing heat from the cooled medium to lower the temperature of the surrounding air, thus achieving a cooling effect. The cooled air, after passing through the indoor heat exchanger 2, is returned to the room through the air supply system, providing a comfortable indoor environment. Especially in the hot summer, the cooling effect of the indoor heat exchanger 2 can significantly reduce the indoor temperature and improve people's living comfort.

[0076] As shown in Figures 2 and 3, the indoor unit 101 also includes multiple centrifugal fans 3, which are coaxially arranged within the housing cavity 10 along the length X of the housing 1. The centrifugal fans 3 are used to introduce airflow into the housing 1 through the housing inlet 1a, and after heat exchange in the indoor heat exchanger 2, the airflow is output outward through the housing outlet 1b. The centrifugal fans 3 introduce airflow into the interior of the housing 1, allowing the airflow to pass through the indoor heat exchanger 2 for heat exchange, and then, under the action of the centrifugal fans 3, return the heat-exchanged airflow to the room.

[0077] Referring to Figures 6 and 7, the centrifugal fan 3 includes a volute 31 and an impeller 32. The volute 31 is disposed within the housing cavity 10 and connected to the housing 1. The volute 31 is an important component of the centrifugal fan 3, used to guide airflow. By designing a specific volute shape, the airflow can rotate along the curved shape of the volute as it flows through the centrifugal fan 3, gradually accelerating. Furthermore, the kinetic energy of the airflow increases as it flows through the volute 31 due to its shape. The impeller 32 is rotatably disposed within the volute 31, and its rotation causes the airflow to flow within the housing 1.

[0078] Referring to Figures 2 and 7, the indoor unit 101 also includes a motor bracket 4, which is disposed between multiple centrifugal fans 3 and fixed relative to the housing 1.

[0079] As shown in Figure 2, the indoor unit 101 also includes a fan motor 5, which drives multiple impellers 32 of multiple centrifugal fans 3 to rotate synchronously.

[0080] As shown in Figures 8 to 10, the fan motor 5 includes an inner stator 51, an outer rotor 52, and an end cover 54. The outer rotor 52 is arranged around the inner stator 51 and can rotate relative to the inner stator 51. The end cover 54 is connected to the outer rotor 52.

[0081] Referring to Figures 5 and 7, the indoor unit 101 also includes a rotating shaft 6, which is connected to the end cover 54 and is connected to multiple impellers 32 of multiple centrifugal fans 3 respectively, so as to drive multiple impellers 32 to rotate synchronously when the outer rotor 52 rotates.

[0082] Because the outer rotor 52 of the fan motor 5 is arranged around the outer stator 51, the heat dissipation of the outer rotor 52 is more effective, and the heat dissipation of the fan motor 5 is better. At the same time, because the gap between the outer rotor 52 and the inner stator 51 is set, no mechanical friction is generated, making the fan motor 5 quieter during operation.

[0083] The fan motor 5 also includes a motor housing 53, which is connected to the inner stator 51 and covers the outer periphery of the outer rotor 52. The motor housing 53 is mounted on the motor bracket 4. This means that the fan motor 5 is mounted on the motor bracket 4 via the motor housing 53, and the fan motor 5 and the motor bracket 4 are together mounted among multiple centrifugal fans 3.

[0084] Since the fan motor 5 is located on one side of the multiple centrifugal fans 3 along the length X of the casing 1, the different distances between each centrifugal fan 3 and the fan motor 5 result in a large difference in the torque received by the impeller 32 of the centrifugal fan 3 that is farther from the fan motor 5 and that of the centrifugal fan 3 that is closer to the fan motor 5. This leads to different rotational efficiencies between the impeller 32 of the centrifugal fan 3 that is farther from the fan motor 5 and that of the impeller 32 that is closer to the fan motor 5, which in turn causes uneven airflow from the indoor unit 101.

[0085] Therefore, in this embodiment, the motor bracket 4 is disposed between multiple centrifugal fans 3, and the motor cover 53 of the fan motor 5 is disposed on the motor bracket 4, so that the fan motor 5 is located between multiple centrifugal fans 3. This reduces the distance between the impellers 32 of multiple centrifugal fans 3 and the fan motor 5. The distance between the impellers 32 of centrifugal fans 3 that were originally far from the fan motor 5 and the fan motor 5 is greatly shortened, reducing the distance of the torque transmission path and reducing the difference in rotation between the impellers 32 of multiple centrifugal fans 3, thereby improving the uniformity of air output of the indoor unit 101.

[0086] Furthermore, in the previous design where the fan motor 5 was mounted on the side of the motor bracket 4, the center of gravity of the fan motor 5 was located on one side of the motor bracket 4, and the fan motor 5 was only supported by fasteners, resulting in low connection stability. In this embodiment, however, the fan motor 5 is mounted on the motor bracket 4 via a motor cover 53, and the outer circumferential surface of the motor cover 53 abuts against the motor bracket 4 in the vertical direction. In this way, the center of gravity of the fan motor 5 is located above the motor bracket 4, and the motor bracket 4 can provide upward support for the fan motor 5 without the need for fastener connections, thus making the mounting structure of the fan motor 5 more stable.

[0087] It is worth noting that in some embodiments of this application, the fan motor 5 selected is an external rotor motor. Since the rotor of the external rotor motor is located outside the stator, this structure makes it exhibit more stable characteristics when outputting torque, and can provide higher torque, thereby ensuring that the centrifugal fan 3 can provide stronger airflow when running at high speed. In addition, it makes the heat dissipation of the fan motor 5 more effective, and can extend the service life of the fan motor 5. Furthermore, the external rotor motor has better stability and durability under high load conditions, which can extend the service life of the indoor unit 101. At the same time, the external rotor motor is generally quieter than the internal rotor motor during operation, which can further reduce the noise generated by the rotation of the fan motor 5. Moreover, the structure of the external rotor motor is relatively simple and easy to disassemble and assemble, which can reduce the maintenance difficulty of the fan motor 5.

[0088] In some embodiments, the centerline of the width of the fan motor 5 along its axial direction corresponds vertically to the motor bracket 4. This indicates that the motor bracket 4 supports the fan motor 5, ensuring stable operation of the fan motor 5 after it is installed in the motor bracket 4. Furthermore, this prevents the motor bracket 4 from bending to one side under the weight of the fan motor 5 due to a vertical offset between the centerline of the fan motor 5 and the motor bracket 4, thus ensuring the service life of the motor bracket 4.

[0089] In some embodiments, the center of gravity of the fan motor 5 is located above the motor bracket 4. If the center of gravity of the fan motor 5 were located to the side of the motor bracket 4, the motor bracket 4 would be subjected to a downward force, causing it to tilt or even break. Therefore, the fact that the center of gravity of the fan motor 5 is located above the motor bracket 4 means that the force exerted by the fan motor 5 on the motor bracket 4 is vertically downward, i.e., the force on the motor bracket 4 is vertically downward. This prevents the motor bracket 4 from tilting to one side, thus ensuring the stable operation of the fan motor 5 and avoiding the situation where the motor bracket 4 tilts to one side under the weight of the fan motor 5 due to its center of gravity being located to the side.

[0090] In some embodiments, referring to Figures 3 and 7, along the axial direction of the rotating shaft 6, the impellers 32 located on both sides of the fan motor 5 are spaced at the same distance from the fan motor 5.

[0091] As the power source driving the impeller 32 to rotate, the fan motor 5 transmits the torque of the outer rotor 52 to the impeller 32 when the outer rotor 52 rotates. The impeller 32 rotates under the action of torque. Therefore, the distance between the fan motor 5 and the impeller 32 is related to the length of the torque transmission path. If the distance between the impeller 32 on both sides of the fan motor 5 and the fan motor 5 is different, the torque received by the impeller 32 on both sides of the fan motor 5 will have different degrees of torque loss due to the different transmission path length, which will result in different rotational efficiencies of the impeller 32 on both sides of the fan motor 5.

[0092] Therefore, in this embodiment, the impellers 32 located on both sides of the fan motor 5 are spaced at the same distance from the fan motor 5, ensuring that when the outer rotor 52 of the fan motor 5 rotates, the path length of the torque transmitted to the impellers 32 on both sides is the same, ensuring that the torque transmitted by the fan motor 5 to the impellers 32 on both sides is the same, thereby ensuring that the impellers 32 can rotate synchronously and have the same rotation efficiency, which further ensures the uniform airflow of the indoor unit 101.

[0093] As shown in Figures 3 and 7, in this embodiment, there are two centrifugal fans 3, which are driven by one fan motor 5. The fan motor 5 is set between the two centrifugal fans 3 through the motor bracket 4, and the distance between the fan motor 5 and the two centrifugal fans 3 is equal.

[0094] In some embodiments, as shown in Figures 3 to 5, the housing 1 includes a top plate 11 for fixing the indoor unit 101 to the top of the room.

[0095] The housing 1 also includes a base plate 12, which is disposed opposite to the top plate 11 along the height direction Z of the housing 1.

[0096] The housing 1 also includes a partition 13, which is disposed within the housing cavity 10 and connected between the top plate 11 and the bottom plate 12. The partition 13 divides the housing cavity 10 into an air inlet cavity 10a and an air outlet cavity 10b. The air inlet cavity 10a communicates with the housing air inlet 1a, and the air outlet cavity 10b communicates with the housing air outlet 1b. Multiple centrifugal fans 3 are coaxially arranged within the air inlet cavity 10a along the length X of the housing 1. Airflow from outside the housing 1 enters the air inlet cavity 10a through the housing air inlet 1a, and after heat exchange, the airflow flows from the air outlet cavity 10b through the housing air outlet 1b into the room.

[0097] The motor bracket 4 is connected to the partition plate 13 and the base plate 12, allowing both the partition plate 13 and the base plate 12 to serve as the foundation for the motor bracket 4. The connection between the motor bracket 4, the partition plate 13, and the base plate 12 forms a triangular support structure, enhancing the overall structural strength of the indoor unit 101 and making the ducted air conditioner 100 more stable and reliable during installation and use. Furthermore, this helps reduce the vibration and noise generated by the fan motor 5 on the motor bracket 4 during operation, improving the operational stability of the ducted air conditioner 100.

[0098] In some embodiments, referring to Figures 2 and 11, the motor bracket 4 includes a base 41 and a cover plate 42. The base 41 is connected to the partition plate 13 and the bottom plate 12. The cover plate 42 is disposed above the base 41, and a motor receiving cavity 4a is formed between the cover plate 42 and the base 41. The motor cover 53 of the fan motor 5 is fixedly disposed within the motor receiving cavity 4a. The motor receiving cavity 4a formed between the cover plate 42 and the base 41 is a stable support structure, providing a solid foundation for the fan motor 5, improving the load-bearing capacity of the motor bracket 4 for the fan motor 5, ensuring the stability of the fan motor 5 during operation, and reducing vibration and noise. Furthermore, the fan motor 5 is disposed within the motor receiving cavity 4a, which provides a certain degree of protection for the fan motor 5 and reduces the impact of external factors on the fan motor 5.

[0099] In some embodiments, as shown in Figures 11 and 12, the base 41 includes a plastic seat 411 and a sheet metal support plate 412. The plastic seat 411 is connected to the partition plate 13 and the bottom plate 12. The sheet metal support plate 412 is disposed on the plastic seat 411. A motor receiving cavity 4a is formed between the cover plate 42 and the sheet metal support plate 412.

[0100] Because the plastic base 411 has limited strength and load-bearing capacity, if the fan motor 5 is installed solely on the plastic base 411, the fan motor 5 will vibrate during operation. Prolonged operation will cause deformation or wear of the plastic base 411, reducing its structural strength. Therefore, in this embodiment, a sheet metal support plate 412 is provided on the plastic base 411. The motor housing 53 of the fan motor 5 directly contacts the sheet metal support plate 412, increasing the contact strength between the base 41 and the fan motor 5. This allows the base 41 to more effectively support the fan motor 5, preventing deformation of the base 41 due to prolonged operation of the fan motor 5, and improving the durability and service life of the base 41.

[0101] It is worth noting that the plastic base 411 can be manufactured using injection molding. Injection molding allows for continuous, high-speed molding, significantly improving production efficiency. Each process (such as injection, cooling, and demolding) is performed continuously, reducing intermediate changeover and adjustment time, thereby shortening the production cycle. Furthermore, injection molding, by improving production efficiency and reducing waste emissions, helps lower production costs.

[0102] In some embodiments, referring to Figures 10 and 11, the outer peripheral surface of the motor housing 53 is an outer cylindrical surface, and the inner wall of the motor receiving cavity 4a is an inner cylindrical surface, with the outer cylindrical surface and the inner cylindrical surface being adapted to each other. This adapted design ensures a tight fit between the motor housing 53 and the motor receiving cavity 4a, so that the motor housing 53 is enclosed by the inner wall of the motor receiving cavity 4a. This helps prevent the fan motor 5 from wobbling or displacing radially along the shaft 6 during operation, reducing vibration and noise during operation, and improving the smoothness of the fan motor 5's operation.

[0103] In some embodiments, as shown in FIG14, the sheet metal support plate 412 includes a limiting flange 4121, which is located on both sides of the fan motor 5 along the axial direction of the rotating shaft 6. Since the outer rotor 52 of the fan motor 5 will generate some vibration during rotation, this will cause the fan motor 5 to be displaced axially along the rotating shaft 6. Therefore, in order to prevent the fan motor 5 from detaching from the motor housing cavity 4a, the limiting flange 4121 of the sheet metal support plate 412 in this embodiment can effectively restrict the axial movement of the fan motor 5, ensuring that it will not be displaced due to vibration or external force during operation, thereby enhancing the stability and fixation of the entire system.

[0104] It should be noted that, in addition to the limiting flange 4121 of the sheet metal support plate 412 used to limit the axial displacement of the fan motor 5 as described in the above embodiments, it can also be a limiting block, a limiting baffle or other structure that can limit the axial displacement of the fan motor 5. This embodiment does not make specific limitations on this.

[0105] In some embodiments, as shown in Figures 13 and 14, the plastic base 411 is provided with a first connecting part 4111 and a first positioning part 4112, and the sheet metal support plate 412 is provided with a second connecting part 4122 and a second positioning part 4123. The first connecting part 4111 and the second connecting part 4122 are connected by fasteners, and the plastic base 411 and the sheet metal support plate 412 are pre-positioned by the first positioning part 4112 and the second positioning part 4123.

[0106] The first connecting part 4111 and the second connecting part 4122 are connected by fasteners, ensuring a stable connection between the plastic base 411 and the sheet metal support plate 412. This connection method is simple and reliable, and can withstand large tensile and shear forces, thereby ensuring the structural strength of the entire base 41.

[0107] Furthermore, the design of the first positioning part 4112 and the second positioning part 4123 allows for pre-positioning of the plastic base 411 and the sheet metal support plate 412 before assembly. This pre-positioning method helps to quickly and accurately determine the relative positions of the two, thereby simplifying the assembly process and improving assembly efficiency. The pre-positioning structure ensures precise alignment of the plastic base 411 and the sheet metal support plate 412 during assembly, avoiding performance degradation or damage caused by assembly errors. This contributes to improving the assembly accuracy and reliability of the entire motor bracket 4.

[0108] In some embodiments, the first connecting part 4111 includes a threaded hole, the first positioning part 4112 includes a positioning post, the second connecting part 4122 includes a connecting hole, the second positioning part 4123 includes a positioning hole, the fastener is a screw, the fastener passes through the connecting hole and connects with the threaded hole, and the positioning post passes through the positioning hole.

[0109] On the one hand, the use of screw connections and the matching of positioning holes and positioning pins makes the installation process simple and quick. Installers only need to insert the positioning pins into the positioning holes and then use screws to fix them through the connecting holes and threaded holes to complete the installation of the plastic base 411 and the sheet metal support plate 412. There is no need for complicated adjustments and calibrations, which not only simplifies the installation steps but also shortens the installation time.

[0110] On the other hand, the precise fit between the positioning holes and positioning posts ensures accurate alignment between the plastic base 411 and the sheet metal support plate 412 during the connection process, preventing loose or unsecured connections due to misalignment and improving the stability and reliability of the connection. The screws pass through the connecting holes and threaded holes for connection; this method is not only simple and reliable but also provides high connection strength. Adjusting the tightness of the screws further ensures a tight connection between the plastic base 411 and the sheet metal support plate 412.

[0111] Furthermore, the use of screw connections simplifies disassembly. When maintenance or component replacement is required, simply loosening the screws easily disconnects the connection between the plastic base 411 and the sheet metal support plate 412. This design not only reduces maintenance complexity but also lowers the failure rate due to improper maintenance. Simultaneously, the ease of replacing the connecting components further reduces maintenance costs.

[0112] It should be noted that the fasteners connecting the plastic base 411 and the sheet metal support plate 412 can be screws as described in the above embodiments, or bolts and nuts, pins and pin holes, or snap-fit ​​connections. This embodiment does not specifically limit the fasteners in this regard.

[0113] For example, the plastic base 411 and the sheet metal tray 412 are connected by snap-fit ​​connections. When the plastic base 411 and the sheet metal tray 412 are connected by snap-fit ​​connections, the snap-fit ​​connection is generally easy to operate, so installation and disassembly can be completed without complex tools or professional skills. Compared with traditional bolt connections or welding methods, snap-fit ​​connections can save a significant amount of installation time and labor costs. The snap-fit ​​design usually has anti-detachment and anti-loosening functions, ensuring a stable connection between the plastic base 411 and the sheet metal tray 412. Due to the simplicity of the snap-fit ​​connection, equipment maintenance personnel can easily perform inspection and maintenance work. When it is necessary to disassemble the sheet metal tray 412, the snap-fit ​​connection reduces the difficulty and time of disassembly and reinstallation, thereby reducing maintenance costs.

[0114] In some embodiments, in conjunction with Figures 3 and 11, the base 41 further includes a first sidewall 413 and a second sidewall 414. The second sidewall 414 and the first sidewall 413 are located on both sides of the motor receiving cavity 4a along the axial direction of the rotating shaft 6. The upper surface of the first sidewall 413 and the upper surface of the second sidewall 414 are both provided with a notch 41a. The notch 41a passes through the first sidewall 413 and the second sidewall 414 along the axial direction of the rotating shaft 6 to avoid the rotating shaft 6.

[0115] The arc-shaped notch 41a on the upper surface of the first sidewall 413 and the second sidewall 414 can make way for the rotating shaft 6, thereby preventing the rotating shaft 6 from interfering with the base 41 during rotation.

[0116] In some embodiments, as shown in Figures 11 and 12, the motor bracket 4 further includes a first reinforcing member 43a, which has a first end 431 and a second end 432. The first end 431 and the second end 432 of the first reinforcing member 43a are connected to the upper surface of the first sidewall 413 and are located on both sides of the notch 41a along the width direction Y of the housing 1.

[0117] Because a notch 41a is formed on the upper surface of the first sidewall 413, the structural strength of the base 41 around the notch 41a is reduced, making it prone to deformation. Therefore, the first reinforcing member 43a, which is connected to both sides of the notch 41a along the width direction Y of the housing 1, connects the base 41 on both sides of the notch 41a to form a complete structure, which enhances the structural strength of the base 41, helps to maintain the stability and integrity of the base 41, and prevents deformation or damage caused by insufficient structural strength.

[0118] The motor bracket 4 also includes a second reinforcing member 43b, which has a third end 433 and a fourth end 434. The third end 433 and the fourth end 434 of the second reinforcing member 43b are connected to the upper surface of the second sidewall 414 and are located on both sides of the notch 41a, respectively.

[0119] The first reinforcing member 43a and the second reinforcing member 43b connect the two sides of the notch 41a of the first sidewall 413 and the second sidewall 414 to form a complete structure, providing support on both sides of the base 41 along the axial direction, further enhancing the rigidity of the base 41, preventing the base 41 from deforming due to force during long-term use, and ensuring the stability and reliability of the fan motor 5.

[0120] In some embodiments, in conjunction with Figures 11 and 15, the first reinforcing member 43a is further provided with a reinforcing flange 435 that can enhance the structural strength and rigidity of the first reinforcing member 43a. The reinforcing flange 435 can prevent the first reinforcing member 43a from bending or deforming, thereby ensuring the reinforcing effect of the first reinforcing member 43a on the structure of the base 41.

[0121] It should be noted that, in addition to the first reinforcing member 43a having a reinforcing flange 435 as described in the above embodiment, the second reinforcing member 43b also has a reinforcing flange 435 to increase the strength of the second reinforcing member 43b itself. This embodiment will not be described in detail here.

[0122] Of course, the first reinforcing member 43a and the second reinforcing member 43b in the above embodiments can be reinforcing plates or reinforcing ribs, and this embodiment does not specifically limit them.

[0123] In some embodiments, referring to Figures 2 and 11, the base 41 is provided with a through hole 41b, which extends through the base 41 along the axial direction of the rotating shaft 6. Since the motor bracket 4 is disposed between multiple centrifugal fans 3, and the air inlet of the centrifugal fan 3 is opened along the axial direction of the rotating shaft 6, the motor bracket 4 disposed between multiple centrifugal fans 3 will cause a certain obstruction in the axial direction, resulting in a reduction in the air intake of the centrifugal fan 3.

[0124] Therefore, in this embodiment, by opening a through hole 41b in the base 41 that runs through the axial direction, the area of ​​the motor bracket 4 that obstructs the airflow in the axial direction is reduced, thereby reducing the obstruction of the air inlet of the centrifugal fan 3 and reducing the impact on the air intake of the centrifugal fan 3.

[0125] In some embodiments, as shown in FIG16, the indoor unit 101 further includes a shock absorber 7, which is disposed between the inner wall surface of the motor receiving cavity 4a and the outer peripheral surface of the motor cover 53.

[0126] The vibration damping component 7, installed between the inner wall of the motor housing 4a and the outer peripheral surface of the motor housing 53, effectively absorbs the vibration generated by the operation of the fan motor 5, thereby reducing the interference of vibration on the surrounding environment and other components in the indoor unit 101. By reducing vibration, the vibration damping component 7 can also significantly reduce the noise generated by vibration, improving the user experience.

[0127] In some embodiments, the damping element 7 is a rubber pad. Because rubber material has high elasticity, it can effectively absorb and disperse the vibration energy generated by the fan motor 5 during operation, thereby reducing the vibration of the fan motor 5. Furthermore, rubber material has good impact resistance, enabling it to maintain its shape and performance stability under external impact, further protecting the fan motor 5 from damage. In addition, the damping performance of the rubber pad can effectively reduce vibration transmission, thereby reducing noise generated by vibration. The softness and plasticity of the rubber pad allow it to fit tightly against the gap between the motor housing 53 of the fan motor 5 and the inner wall of the motor housing 4a, reducing noise leakage.

[0128] It is worth noting that, in addition to the rubber pad described in the above embodiment, the shock absorber 7 can also be polyurethane, anti-vibration steel plate or other materials that can absorb the vibration of the fan motor 5 during operation. This embodiment does not limit this.

[0129] For example, the damping component 7 can be polyurethane. Polyurethane is a polymer material with excellent damping performance. Placing a polyurethane damping component between the inner wall of the motor housing 4a and the outer peripheral surface of the motor housing 53 can effectively reduce the transmission of vibration and noise. The damping component 7 can also be a shock-absorbing steel plate. Shock-absorbing steel plate is a metallic material with good strength and corrosion resistance. The damping effect between the inner wall of the motor housing 4a and the outer peripheral surface of the motor housing 53 can be achieved by using a specific structure with a corrugated shape or adding a damping layer.

[0130] In some embodiments, as shown in FIG17, the impeller 32 includes a hub 321 having a central hole.

[0131] The impeller 32 also includes blades 322, which are connected to the outer periphery of the hub 321.

[0132] The rotating shaft 6 is connected to the center holes of multiple hubs 321 by fasteners. The hubs 321 rotate under the drive of the rotating shaft 6 to drive the blades 322 to rotate and discharge air.

[0133] Because the rotating shaft 6 is connected to the center hole of the hub 321 via fasteners, torque can be directly and efficiently transmitted to each impeller 32. This design reduces intermediate transmission links, which not only simplifies the structure of the indoor unit 101 but also reduces energy loss during transmission, improving the overall energy transfer efficiency of the system. Furthermore, this helps reduce torque dispersion and loss during transmission, improving the efficiency of the entire centrifugal fan 3 system.

[0134] It should be noted that the fasteners in this embodiment can be bolts, screws, or pins, and this embodiment does not specifically limit them.

[0135] In some embodiments, as shown in FIG17, the impeller 32 further includes a reinforcing structure 323 disposed on the hub 321 and surrounding the central hole of the hub 321.

[0136] Since the shaft 6 is connected to the hub 321 via fasteners, the hub 321 may experience shear stress from the fasteners when it rotates. Therefore, providing a reinforcing structure 323 around the central hole of the hub 321 effectively enhances the overall structural strength and rigidity of the impeller 32. During high-speed rotation, the impeller 32 needs to withstand enormous centrifugal force and other mechanical stresses. The reinforcing structure 323 ensures that the impeller 32 does not deform or break under these stresses, thereby improving its stability and durability. Furthermore, the reinforcing structure 323 can optimize the stress distribution inside the impeller 32, helping to reduce stress concentration and lowering the risk of damage to the impeller 32 due to excessive stress during rotation.

[0137] For example, the reinforcing structure 323 can be a reinforcing rib, that is, a reinforcing rib is provided around the central hole of the hub 321. The reinforcing rib increases the structural strength around the central hole of the hub 321, ensuring that the connection between the hub 321 and the rotating shaft 6 can withstand greater stress, and ensuring the normal rotation of the impeller 32.

[0138] It should be noted that, in addition to the reinforcing ribs in the above embodiments, the reinforcing structure 323 can also be a reinforcing protrusion, a rib, or other structures that can increase the strength of the wheel hub 321. This embodiment does not make specific limitations on this.

[0139] In some embodiments, referring to Figures 3 and 7, the rotating shaft 6 is integrally formed with the end cover 54, and the fan motor 5 also includes a stator bearing 55, which is disposed at the center of the inner stator 51, and the rotating shaft 6 passes through the stator bearing 55.

[0140] The integral molding of the shaft 6 and end cover 54 makes the connection between them more robust, reducing the risk of loosening or damage due to improper connection. The tighter connection between the shaft 6 and end cover 54 reduces friction and energy loss caused by connection gaps. This helps improve the operating efficiency of the fan motor 5 and reduce energy consumption. The stator bearing 55 is located at the center of the inner stator 51, effectively supporting the inner stator 51 and ensuring its stability during rotation. Simultaneously, the stator bearing 55 also serves a positioning function, ensuring that the relative position between the shaft 6 and the inner stator 51 does not change, making the fan motor 5 rotate more smoothly. Furthermore, the stator bearing 55 can withstand the centrifugal force and friction generated by high-speed rotation, supporting the inner stator 51 while reducing friction between the shaft 6 and the inner stator 51, ensuring the stability and reliability of the fan motor 5 during high-speed operation.

[0141] 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.

Claims

1. A ducted air conditioner, comprising: Indoor unit, the indoor unit includes: The housing is provided with a housing air inlet and a housing air outlet, and a housing receiving cavity is formed inside the housing; An indoor heat exchanger is disposed within the housing cavity of the machine casing and is used to exchange heat with the flowing air. Multiple centrifugal fans are coaxially arranged within the housing cavity along the length of the housing, and each centrifugal fan includes: A volute, wherein the volute is disposed within the housing cavity and connected to the housing; An impeller, which is rotatably disposed within the volute; A motor bracket is disposed between the plurality of centrifugal fans and fixed relative to the housing; A fan motor, used to drive the impellers of the plurality of centrifugal fans to rotate synchronously, the fan motor comprising: inner stator; An outer rotor is arranged around the inner stator and is rotatable relative to the inner stator. The motor cover is connected to the inner stator and covers the outer periphery of the outer rotor. The motor cover is mounted on the motor bracket, and the outer peripheral surface of the motor cover abuts against the motor bracket in the vertical direction. End cap, the end cap being connected to the outer rotor; A rotating shaft is connected to the end cover and is respectively connected to the impellers of the plurality of centrifugal fans so as to drive the plurality of impellers to rotate synchronously when the outer rotor rotates.

2. A ducted air conditioner, comprising: Indoor unit, the indoor unit includes: The housing is provided with a housing air inlet and a housing air outlet, and a housing receiving cavity is formed inside the housing; An indoor heat exchanger is disposed within the housing cavity of the machine casing and is used to exchange heat with the flowing air. Multiple centrifugal fans are coaxially arranged within the housing cavity along the length of the housing, and each centrifugal fan includes: A volute, wherein the volute is disposed within the housing cavity and connected to the housing; Impeller, the impeller being rotatably disposed within the volute; A motor bracket is disposed between the plurality of centrifugal fans and fixed relative to the housing; A fan motor, used to drive the impellers of the plurality of centrifugal fans to rotate synchronously, the fan motor comprising: inner stator; An outer rotor is arranged around the inner stator and is rotatable relative to the inner stator. The motor housing is connected to the inner stator and covers the outer periphery of the outer rotor. The motor housing is mounted on the motor bracket. The centerline of the width of the fan motor along its axial direction corresponds to the motor bracket in the vertical direction. End cap, the end cap being connected to the outer rotor; A rotating shaft is connected to the end cover and is respectively connected to the impellers of the plurality of centrifugal fans so as to drive the plurality of impellers to rotate synchronously when the outer rotor rotates.

3. The ducted air conditioner according to claim 1 or 2, The housing includes: A top plate, which is used to fix the ceiling of the room; A base plate, which is disposed opposite to the top plate along the height direction of the housing; A partition is disposed within the housing cavity and connected between the top plate and the bottom plate. The partition divides the housing cavity into an air inlet cavity and an air outlet cavity. The air inlet cavity is connected to the air inlet of the housing, and the air outlet cavity is connected to the air outlet of the housing. The plurality of centrifugal fans are coaxially disposed within the air inlet cavity along the length of the housing. The motor bracket is connected to the partition and the base plate.

4. The ducted air conditioner according to claim 3, The motor bracket includes: A base, the base being connected to the partition and the bottom plate; A cover plate is disposed above the base, and a motor receiving cavity is formed between the cover plate and the base. The motor cover is fixedly disposed in the motor receiving cavity.

5. The ducted air conditioner according to claim 4, The base includes: A plastic base body, the plastic base body being connected to the partition and the base plate; A sheet metal support plate is disposed on the plastic base, and the cover plate and the sheet metal support plate form the motor receiving cavity.

6. The duct-type air conditioner according to claim 5, wherein the outer peripheral surface of the motor cover is an outer cylindrical surface, the inner wall of the motor receiving cavity is an inner cylindrical surface, and the outer cylindrical surface is adapted to the inner cylindrical surface.

7. The ducted air conditioner according to claim 5, wherein the sheet metal support plate comprises: A limiting flange is provided, which is located on both sides of the fan motor along the axial direction of the rotating shaft.

8. The ducted air conditioner according to claim 5, The plastic base is provided with a first connecting part and a first positioning part; The sheet metal support plate is provided with a second connecting part and a second positioning part; The first connecting part and the second connecting part are connected by fasteners; The plastic base and the sheet metal support plate are pre-positioned by the first positioning part and the second positioning part.

9. The ducted air conditioner according to claim 8, The first connecting portion includes a threaded hole; The first positioning part includes a positioning post; The second connecting part includes a connecting hole; The second positioning part includes a positioning hole; The fastener is a screw, which passes through the connecting hole and connects to the threaded hole; The positioning pin is inserted into the positioning hole.

10. The ducted air conditioner according to claim 4, wherein the base further comprises: First sidewall; The second sidewall and the first sidewall are located on both sides of the motor receiving cavity along the axial direction of the rotating shaft. The upper surface of the first sidewall and the upper surface of the second sidewall are provided with notches. The notches pass through the first sidewall and the second sidewall along the axial direction of the rotating shaft to avoid the rotating shaft. The motor bracket also includes: A first reinforcing member has a first end and a second end. The first end and the second end of the first reinforcing member are connected to the upper surface of the first sidewall and are respectively located on both sides of the notch along the width direction of the housing. The second reinforcing member has a third end and a fourth end, the third end and the fourth end of the second reinforcing member being connected to the upper surface of the second sidewall and located on both sides of the notch along the width direction of the housing.

11. The duct-type air conditioner according to claim 4, wherein the base is provided with a through hole, and the through hole extends through the base along the axial direction of the rotating shaft.

12. The ducted air conditioner according to claim 4, wherein the indoor unit further comprises: A shock absorber is disposed between the inner wall surface of the motor housing cavity and the outer peripheral surface of the motor housing.

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