Ducted fan

Abstract

The application discloses a ducted air conditioner, which comprises a shell, a heat exchanger, an electrical box, a centrifugal fan assembly, a first shaft hole, a rotating shaft, a driving motor and a threaded locking piece. The shell has a first side wall and a second side wall which are arranged at intervals in a first preset direction. The heat exchanger, the electrical box, the centrifugal fan assembly and the driving motor are arranged in the inner cavity of the shell. The centrifugal fan assembly is located between the first side wall and the second side wall. The first shaft hole is formed on the centrifugal fan assembly and penetrates the fan assembly along the first preset direction. The rotating shaft is arranged in the first shaft hole. The inner stator of the driving motor is arranged on the box body of the electrical box. The outer rotor of the driving motor is connected with the second end and is arranged on the outer side of the inner stator in the radial direction. After the threaded locking piece is unscrewed, the outer rotor and the rotating shaft can move along the first preset direction, so that the outer rotor is separated from the inner stator, and the inner stator of the driving motor can be removed from the shell for maintenance and repair, thereby improving the maintenance and repair efficiency.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and more particularly to a ducted air conditioner. Background Technology

[0002] Ductless air conditioning indoor units, or simply ducted units, are widely chosen for both commercial and residential applications due to their unique advantages such as strong concealment and the ability to maintain a clean and uncluttered interior design. Ductless units typically contain a heat exchanger and multiple centrifugal fans. These fans draw indoor air into the unit, which then passes through the heat exchanger before being blown out of the vents, thus regulating the indoor temperature.

[0003] In related technologies, an internal rotor motor is typically used to drive a centrifugal fan to deliver air into the room. However, since the internal rotor motor usually has the inner rotor extending out of the outer stator, and both ends of the inner rotor are located outside the outer stator, the two ends of the inner rotor can be fixedly connected to the fan shafts on both sides of the internal rotor motor via couplings. Thus, the rotation of the inner rotor can drive the centrifugal fan to rotate, thereby delivering air into the room.

[0004] However, this structure has certain limitations for the inspection and maintenance of the internal rotor motor. For example, it is usually necessary to disassemble the centrifugal fans on both sides of the internal rotor motor before the internal rotor motor can be disassembled and finally inspected and maintained, which makes the inspection and maintenance process of the internal rotor motor more complicated. Summary of the Invention

[0005] This application discloses a duct air conditioner that can better protect the drive motor while facilitating the removal of the inner stator of the drive motor from the housing for inspection and maintenance, resulting in higher inspection and maintenance efficiency and lower inspection and maintenance costs.

[0006] To achieve the above objectives, some embodiments of this application disclose a duct air handling unit, the duct air handling unit comprising:

[0007] A housing having an inner cavity, and having a first sidewall and a second sidewall that are opposite to and spaced apart in a first predetermined direction;

[0008] A heat exchanger, wherein the heat exchanger is disposed in the inner cavity;

[0009] An electrical box, the electrical box being disposed on the second side wall, and the electrical box comprising:

[0010] The box body, which is disposed on the second side wall; and

[0011] Electronic device, wherein the electronic device is disposed in the housing;

[0012] A centrifugal fan assembly is disposed in the inner cavity and located between the first side wall and the second side wall, and the centrifugal fan assembly and the heat exchanger are spaced apart along a second preset direction;

[0013] A first shaft hole is formed on the centrifugal fan assembly, and the first shaft hole penetrates the centrifugal fan assembly along the first preset direction;

[0014] A rotating shaft, which passes through the first shaft hole, and has a first end and a second end that are opposite to each other in the first preset direction;

[0015] A drive motor is mounted on the housing of the electrical box and located within the inner cavity. The drive motor is connected to the second end of the rotating shaft and is used to drive the centrifugal fan assembly to rotate. The drive motor includes:

[0016] An inner stator, the inner stator being disposed on the housing of the electrical box and electrically connected to the electronic components of the electrical box; and,

[0017] An outer rotor, nested radially outside the inner stator, and connected to the second end of the shaft; and,

[0018] The centrifugal fan assembly is fixed to the rotating shaft by the threaded locking member. After the threaded locking member is unscrewed, the outer rotor and the rotating shaft can move along the first preset direction so that the outer rotor is separated from the inner stator.

[0019] In some embodiments of the duct air conditioner of this application, the drive motor is mounted on the first side wall of the housing, and the inner stator of the drive motor is mounted on the first side wall of the housing through the electrical box. The outer stator is nested on the outer side of the inner stator in the radial direction, and the outer stator is connected to a rotating shaft. The rotating shaft passes through the first shaft hole of the centrifugal fan assembly, and the rotating shaft is fixed to the centrifugal fan by a threaded locking member. This allows the rotating shaft to move relative to the first shaft hole in a first preset direction when the threaded locking member is unscrewed. This provides the possibility for the outer rotor to move in the first preset direction to separate from the inner stator, so that the outer rotor and the rotating shaft can move away from the inner stator, allowing the outer rotor to separate from the inner stator, and the inner stator is no longer affected by the outer rotor. The constraint of the outer rotor also avoids the need for operating space to remove the inner stator. Thus, in scenarios where the drive motor needs inspection and maintenance, it is only necessary to unscrew the threaded locking parts and move the outer rotor and the rotation axis away from the inner stator, so that the inner stator is no longer constrained by the outer rotor, thus creating operating space for removal. The operator can then remove the inner stator from the return air vent formed between the first and second side walls. This allows the inner stator to be removed from the return air vent, enabling the drive motor to be disassembled and its inner stator removed for inspection and maintenance without disassembling components such as the centrifugal fan assembly. This greatly improves the efficiency of drive motor inspection and maintenance, reduces inspection and maintenance costs, and helps improve product competitiveness and user satisfaction.

[0020] In addition, since the drive motor is located inside the housing, the housing not only protects the drive motor from collisions and damage, thus extending its service life, but also shields it from dust accumulation. Furthermore, the fact that the drive motor and the electrical box are located on the same side of the centrifugal fan assembly facilitates wiring connections between them, avoids excessively long wiring, and allows for neater wiring layout, ensuring reliable electrical conductivity between the two components.

[0021] As an optional implementation, in the embodiments of this application, the first end of the rotating shaft and the first sidewall are spaced apart, and the distance between the rotating shaft and the first sidewall is L1 in the first preset direction. After the threaded locking member is unscrewed, the rotating shaft can move relative to the first shaft hole and approach the first sidewall in the first preset direction.

[0022] The outer rotor has a nested portion nested within the inner stator. The size of the nested portion in the first preset direction is L2, where L2 ≤ L1, so that when the threaded locking member is unscrewed, the outer rotor can separate relative to the inner stator when the outer rotor and the shaft can move along the first preset direction to approach the first side wall.

[0023] By spacing the first end of the rotating shaft and the first sidewall, the rotating shaft and the outer rotor can move along the first preset direction to facilitate the removal of the inner stator. Compared with the method of opening blind holes in the first sidewall, the thickness of the first sidewall in the first preset direction can be smaller, reducing the weight of the housing and the duct machine, which is conducive to the lightweight design of the duct machine. Moreover, without opening blind holes, through holes and other hole structures, the strength of the first sidewall can be avoided.

[0024] As an optional implementation, in the embodiments of this application, the drive motor is a magnetic levitation motor.

[0025] This configuration allows the outer rotor and inner stator to be locked together by levitation force. It utilizes the characteristic of the magnetic levitation motor that the outer rotor and inner stator are locked together by levitation force to achieve positioning, ensuring rotational accuracy. Moreover, it allows the outer rotor and inner stator to be positioned without contact. During the operation of the centrifugal fan assembly driven by the drive motor, the outer rotor and inner stator rotate without contact, isolating the vibration transmission between the centrifugal fan assembly and the inner stator. At the same time, it also significantly reduces the noise and vibration generated by mechanical friction, greatly reducing the noise and vibration of the entire duct air conditioner, avoiding the generation of abnormal sounds, and improving user comfort.

[0026] As an optional implementation, in an embodiment of this application, the duct machine further includes a support bracket disposed in the inner cavity, the support bracket being located between the centrifugal fan assembly and the first side wall, the support bracket having a second shaft hole on its surface facing the centrifugal fan assembly, and the first end of the rotating shaft passing through the second shaft hole.

[0027] This configuration allows the support bracket to support the first end of the shaft, preventing it from being suspended in the air. It also supports the shaft, preventing it from bending and ensuring that the shaft rotates stably without wobbling as it rotates with the outer rotor.

[0028] As an optional implementation, in an embodiment of this application, the second shaft hole penetrates the surface of the support bracket facing away from the centrifugal fan assembly along the first preset direction, and the support bracket and the first sidewall are spaced apart to form a moving space for the rotating shaft to move between the support bracket and the first sidewall.

[0029] This design eliminates the need for the support bracket to be very thick in the first preset direction, thus avoiding excessive thickness and reducing the weight of the support bracket and the duct unit, which in turn facilitates a lightweight design for the duct unit.

[0030] As an optional implementation, in an embodiment of this application, the duct machine further includes a partition disposed in the inner cavity. The partition is connected between the first side wall and the second side wall and divides the inner cavity into a return air cavity and an outlet air cavity. At least one ventilation opening is provided on the partition to allow the return air cavity and the outlet air cavity to communicate with each other. The heat exchanger is disposed in the outlet air cavity, and the centrifugal fan assembly, the rotating shaft, and the drive motor are all disposed in the return air cavity. The support bracket is mounted and connected to the partition.

[0031] This configuration, compared to setting an additional support structure between the support bracket and the first side wall to support the support bracket and achieve an interval between the support bracket and the first side wall, directly installs the support bracket on the partition, reducing the use of a support structure and thus reducing the number of parts used in the duct air conditioner, thereby helping to reduce the cost of the duct air conditioner. At the same time, because the support bracket and the first side wall are spaced apart, the support bracket is no longer set on the first side wall through a support structure, which can reduce the load-bearing burden on the first side wall and extend its service life.

[0032] As an optional implementation, in an embodiment of this application, the support bracket includes:

[0033] A support plate, wherein the second shaft hole is formed on the support plate so that the support plate is used to support the first end of the rotating shaft, and the support plate is spaced apart from the first sidewall, forming the moving space between the support plate and the first sidewall; and,

[0034] A fixing plate is connected to the support plate and is fixedly connected to the partition plate.

[0035] This configuration allows the support plate to support the first end of the rotating shaft, and the fixing plate to provide a fixed position for the support plate, facilitating the fixed connection between the support plate and the partition.

[0036] As an optional implementation, in the embodiments of this application, the direction perpendicular to the first preset direction and the second preset direction is configured as a third preset direction;

[0037] The support plate has a first abutting plate formed by bending and extending at its upper end in the second preset direction away from the first sidewall, and the first abutting plate abuts against the partition plate;

[0038] The support bracket further includes a side plate, which is connected to the side of the support plate in the third preset direction and located between the support plate and the first side wall. The side plate in the second preset direction has a side portion that bends and extends toward the support plate to form a second abutment plate. The second abutment plate abuts against the partition plate and constitutes the fixing plate. The second abutment plate is fixedly connected to the partition plate.

[0039] This configuration allows the first and second abutment plates to be located on opposite sides of the support plate in a first preset direction, enabling both plates to abut against the partition. This not only increases the contact area between the support plate and the partition using the first and second abutment plates, but also significantly increases the contact area between them. Consequently, during assembly, the support bracket can be smoothly abutted against the partition, and the second abutment plate can be used to securely fix it to the partition, ensuring a more stable and secure connection.

[0040] As an optional implementation, in an embodiment of this application, the duct machine further includes a first bearing, which is disposed between the first end and the second shaft hole.

[0041] This configuration allows the first bearing to support the first end of the shaft, reducing the coefficient of friction during the shaft's rotation relative to the second shaft hole and ensuring its rotational accuracy. This, in turn, helps improve the shaft's rotational smoothness and reduces noise generation.

[0042] As an optional implementation, in an embodiment of this application, the rotating shaft includes:

[0043] A first shaft body, the first end formed in the first shaft body, the first shaft body passing through the second shaft hole; and...

[0044] The second shaft is connected to the first shaft along the first preset direction, and the second shaft passes through the first shaft hole and is fixed to the centrifugal fan assembly by the threaded locking member. The radial dimension of the second shaft is greater than that of the first shaft.

[0045] With this configuration, the larger radial dimension of the second shaft ensures the structural strength of the rotating shaft, providing sufficient structural strength to drive the centrifugal fan assembly and ensuring the service life of the rotating shaft. Furthermore, the rotating shaft can be adapted to the size of the first shaft, which is a standard component, eliminating the need for additional customization of the first bearing and thus reducing costs.

[0046] As an optional implementation, in an embodiment of this application, the outer rotor includes:

[0047] A rotor housing, wherein the rotor housing is sleeved on the outer side of the inner stator in the radial direction, and the rotor housing is provided with a third shaft hole extending along the first preset direction; and,

[0048] A magnetic ring is disposed inside the rotor housing and nested on the outer side of the inner stator in the radial direction;

[0049] The inner stator is provided with a central hole whose axis extends along the first preset direction. The second end of the rotating shaft passes through the third shaft hole, the magnetic ring and the central hole. When the rotating shaft rotates with the outer rotor, the second end can rotate relative to the central hole.

[0050] By inserting the second end of the rotating shaft through the third shaft hole of the rotor housing and the hollow part of the magnetic ring into the center hole of the inner stator, the outer rotor can be radially supported by the inner stator through the second end of the rotating shaft. This ensures that the outer rotor has sufficient radial support, improves the rotational smoothness of the outer rotor, and reduces noise generation.

[0051] As an optional implementation, in an embodiment of this application, the duct machine further includes a second bearing, which is disposed between the second end and the central hole.

[0052] This configuration allows the second bearing to support the second end of the shaft, reducing the coefficient of friction of the second end of the shaft during rotation relative to the central hole and ensuring its rotational accuracy. This, in turn, helps to improve the rotational smoothness of the outer rotor and reduce noise generation.

[0053] As an optional implementation, in an embodiment of this application, the rotating shaft includes:

[0054] A second shaft, which passes through the first shaft hole and is fixed to the centrifugal fan assembly by the threaded locking member; and...

[0055] A third shaft is connected to the second shaft along the first preset direction, and the second end is formed on the third shaft. The radial dimension of the third shaft is smaller than the radial dimension of the second shaft.

[0056] With this configuration, the larger radial dimension of the second shaft ensures the structural strength of the shaft, providing sufficient structural strength to drive the centrifugal fan assembly and ensuring the shaft's service life. Furthermore, the shaft can be adapted to the size of the third shaft, which is a standard component, eliminating the need for custom-made second bearings and thus reducing costs.

[0057] As an optional implementation, in an embodiment of this application, the duct machine further includes an elastic bushing, which is disposed between the second bearing and the central hole.

[0058] This design not only utilizes the elastic force of the elastic bushing to ensure that the second bearing always fits against the wall of the central hole, effectively preventing radial runout of the second bearing; it also utilizes the elastic deformation capability of the elastic bushing to absorb some of the impact energy, thereby achieving vibration reduction and noise reduction.

[0059] As an optional implementation, in the embodiments of this application, the centrifugal fan assembly includes a plurality of centrifugal fans arranged along the first preset direction, the first shaft hole includes a plurality of sub-shaft holes in the same number as the number of centrifugal fans, one sub-shaft hole is formed on one centrifugal fan, and one sub-shaft hole penetrates one centrifugal fan along the first preset direction;

[0060] The rotating shaft passes through the plurality of sub-shaft holes.

[0061] This configuration not only significantly improves the coaxiality of each centrifugal fan and the coaxiality between the centrifugal fan assembly and the drive motor, thus facilitating the smooth rotation of multiple centrifugal fans by the drive motor and avoiding abnormal noise; it also reduces the number of parts used in the ducted air conditioner, improves the assembly efficiency of the ducted air conditioner, and lowers the cost of the ducted air conditioner.

[0062] As an optional implementation, in the embodiments of this application, the inner stator includes:

[0063] A stator housing, which is detachably mounted on the housing of the electrical box;

[0064] A stator support, which is mounted on the stator housing;

[0065] Stator windings, the stator windings being mounted within the stator housing via the stator bracket; and,

[0066] A stator protective cover is detachably mounted on the stator housing and, together with the stator housing and the box body of the electrical box, forms an open receiving cavity.

[0067] The stator winding is located in the receiving cavity, and the outer rotor is sleeved on the outer side of the stator winding in the radial direction and is at least partially located in the receiving cavity.

[0068] When inspecting and maintaining a drive motor, the outer rotor and its axis are moved away from the inner stator. This frees the inner stator from the constraint of the outer rotor, allowing it to be pulled out a certain distance. This creates space for disassembling the inner stator, allowing the stator protective cover to be removed. Then, the stator housing is detached from the electrical box, enabling the stator housing, stator support, and stator windings to be taken out as a whole for inspection and maintenance. This method is relatively simple and greatly improves the efficiency of drive motor inspection and maintenance.

[0069] Compared with the prior art, the beneficial effects of this application are as follows:

[0070] The duct air conditioner provided in this application embodiment has a drive motor mounted on the first side wall of the housing, with the inner stator of the drive motor mounted on the first side wall of the housing through the electrical box. An outer stator is nested radially outside the inner stator, and the outer stator is connected to a rotating shaft. The rotating shaft passes through the first shaft hole of the centrifugal fan assembly and is fixed to the centrifugal fan by a threaded locking member. This allows the rotating shaft to move relative to the first shaft hole in a first preset direction when the threaded locking member is unscrewed. This provides the possibility for the outer rotor to move in the first preset direction to separate from the inner stator, allowing the outer rotor and the rotating shaft to move away from the inner stator, thus separating the outer rotor from the inner stator and freeing the inner stator from external rotation. The constraint of the outer rotor also avoids the need for operating space to remove the inner stator. Thus, in scenarios where the drive motor needs inspection and maintenance, it is only necessary to unscrew the threaded locking parts and move the outer rotor and the rotation axis away from the inner stator, so that the inner stator is no longer constrained by the outer rotor, thus creating operating space for removal. The operator can then remove the inner stator from the return air vent formed between the first and second side walls. This allows the inner stator to be removed from the return air vent, enabling the drive motor to be disassembled and its inner stator removed for inspection and maintenance without disassembling components such as the centrifugal fan assembly. This greatly improves the efficiency of drive motor inspection and maintenance, reduces inspection and maintenance costs, and helps improve product competitiveness and user satisfaction.

[0071] In addition, since the drive motor is located inside the housing, the housing not only protects the drive motor from collisions and damage, thus extending its service life, but also shields it from dust accumulation. Furthermore, the fact that the drive motor and the electrical box are located on the same side of the centrifugal fan assembly facilitates wiring connections between them, avoids excessively long wiring, and allows for neater wiring layout, ensuring reliable electrical conductivity between the two components. Attached Figure Description

[0072] To more clearly illustrate the technical solutions in the embodiments of this application, the 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.

[0073] Figure 1 This is a schematic diagram of the duct air conditioner disclosed in the embodiments of this application from a first-person perspective;

[0074] Figure 2 This is a schematic diagram of the duct air conditioner disclosed in the embodiments of this application from a second-view perspective;

[0075] Figure 3 This is a first exploded structural diagram of the duct machine disclosed in the embodiments of this application;

[0076] Figure 4 This is a schematic diagram of the duct air conditioner disclosed in the embodiments of this application from a third-person perspective;

[0077] Figure 5 This is a second exploded structural diagram of the duct machine disclosed in the embodiments of this application;

[0078] Figure 6 This is a top view of the ductwork unit disclosed in the embodiments of this application;

[0079] Figure 7 The ductwork machine disclosed in the embodiments of this application is... Figure 6 A cross-sectional view along the AA direction;

[0080] Figure 8 yes Figure 7 A magnified view of point M in the image;

[0081] Figure 9 yes Figure 7 A magnified view of point N in the image;

[0082] Figure 10 This is a schematic diagram of the structure of the duct air conditioner disclosed in the embodiments of this application, without showing the top cover;

[0083] Figure 11 This is a schematic diagram of the support bracket disclosed in the embodiments of this application from a first-view perspective;

[0084] Figure 12 This is a schematic diagram of the support bracket disclosed in the embodiments of this application from a second-view perspective.

[0085] Explanation of main figure symbols

[0086] 100 - Ductless air conditioner; 11 - Housing; 11a - Inner cavity; 11a1 - Return air cavity; 11a2 - Air outlet cavity; 11b - Return air inlet; 11c - Air outlet; 111 - First side wall; 112 - Second side wall; 12 - Heat exchanger; 13 - Centrifugal fan assembly; 131 - Centrifugal fan; 14 - First shaft hole; 141 - Sub-shaft hole; 15 - Rotating shaft; 15a - First end; 15b - Second end; 151 - First shaft body; 152 - Second shaft body; 153 - Third shaft body; 16 - Drive motor; 161 - Inner stator; 1611 - Center hole; 16 12-Stator housing; 1613-Stator bracket; 1614-Stator winding; 1615-Stator protective cover; 162-Outer rotor; 162a-Nested part; 1621-Rotor housing; 16211-Third shaft hole; 1622-Magnetic ring; 17-Support bracket; 171-Second shaft hole; 172-Support plate; 173-Fixing plate; 174-First abutment plate; 175-Side plate; 176-Second abutment plate; 18-Partition plate; 181-Ventilation opening; 19-First bearing; 20-Second bearing; 21-Elastic bushing; 22-Electrical box;

[0087] f1 - First preset direction; f2 - Second preset direction; f3 - Third preset direction. Detailed Implementation

[0088] To make the objectives, technical solutions, and advantages of this application clearer, the exemplary embodiments of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments. Obviously, the described exemplary embodiments are only some embodiments of this application, and not all embodiments. That is, the specific embodiments described herein are merely used to explain this application and are not intended to limit this application.

[0089] It should be noted that the brief descriptions of terminology used in this application are merely for the purpose of facilitating understanding of the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0090] 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. They 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. Therefore, they should not be construed as limitations on this application.

[0091] The terms “first,” “second,” etc., used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first sidewall may be referred to as a second sidewall, and similarly, a second sidewall may be referred to as a first sidewall. Both the first and second sidewalls are sidewalls, but they are not the same sidewall.

[0092] Furthermore, 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, "a plurality of" means two or more.

[0093] 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.

[0094] In the description of this application, it should be noted that the singular forms of "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that terms such as "comprising / including" or "having" specify the presence of the stated features, integrals, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integrals, steps, operations, components, parts, or combinations thereof.

[0095] In addition, the term "and / or" as used in this specification includes any and all combinations of the related listed items. For example, A and / or B can mean: A alone, A and B together, or B alone. That is, the term "and / or" as used in this specification includes any and all combinations of the related listed items.

[0096] Air conditioners are common household appliances, typically consisting of an indoor unit and an outdoor unit. The indoor unit is installed indoors, while the outdoor unit is installed outdoors. In related technologies, indoor units can be classified according to their installation method into floor-standing indoor units, wall-mounted indoor units, and ducted air conditioning indoor units (referred to as ducted units). Among these, ducted units are widely used because they occupy less effective indoor space.

[0097] Common ducted air conditioners typically have a heat exchanger and multiple centrifugal fans inside. This allows indoor air to be drawn into the ducted air conditioner through the centrifugal fans, then passed through the heat exchanger, and finally blown into the room through the air outlet, thereby achieving the effect of regulating the indoor temperature.

[0098] To make a centrifugal fan rotate, an electric motor is usually used to drive the centrifugal fan to deliver air into the room. At the same time, to reduce costs, one motor is usually used to drive multiple centrifugal fans. In this case, the motor is usually placed in the middle of the multiple centrifugal fans and is an internal rotor motor.

[0099] However, since the inner rotor motor usually has the inner rotor extending out of the outer stator and the two ends of the inner rotor located outside the inner stator, the two ends of the inner rotor can be fixedly connected to the fan shafts on both sides of the inner rotor motor through couplings. Thus, the rotation of the inner rotor can drive the centrifugal fan to rotate, thereby sending air into the room.

[0100] However, with such a structure, when it is necessary to inspect or maintain the internal rotor motor, it is usually necessary to first disassemble the centrifugal fans on both sides of the internal rotor motor before the internal rotor motor can be disassembled and finally inspected or maintained. This makes the inspection and maintenance process of the internal rotor motor quite cumbersome.

[0101] In view of this, the present application provides a duct air conditioner that allows for the inspection and maintenance of the drive motor without disassembling the centrifugal fan assembly. This improves the efficiency of drive motor inspection and maintenance, reduces inspection and maintenance costs, and helps to enhance product competitiveness and user satisfaction.

[0102] 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.

[0103] Please see Figure 1 , Figure 1 This is an exemplary structural diagram of a ducted air handling unit provided in an embodiment of this application. The ducted air handling unit 100 provided in this embodiment of the application may be a block structure, such as a rectangular block structure, a square block structure, etc.

[0104] To more conveniently illustrate the ducted air conditioner provided in the embodiments of this application, and as an example rather than a limitation, the technical solution of this application will be described in detail below with the ducted air conditioner 100 having a rectangular shape as an example.

[0105] Please see Figure 1The duct air conditioner 100 provided in this application embodiment includes a housing 11, which serves as an external protective component of the duct air conditioner 100. Its external shape is the same as that of the duct air conditioner 100. The external shape of the housing 11 is rectangular, and the housing 11 has a length direction, a width direction, and a thickness direction.

[0106] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 11 has an inner cavity 11a; the inner cavity 11a can be used to accommodate various functional components of the duct air conditioner 100, such as the heat exchanger 12, centrifugal fan assembly 13 and drive motor 16 mentioned later.

[0107] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 11 has a return air inlet 11b and an air outlet 11c. The return air inlet 11b and the air outlet 11c are respectively connected to the inner cavity 11a. The return air inlet 11b and the air outlet 11c can be arranged opposite to each other in the width direction of the housing 11.

[0108] In some embodiments, the housing 11 has a first sidewall 111 and a second sidewall 112 that are opposite to and spaced apart in a first preset direction f1, wherein the first preset direction f1 extends along the length direction of the housing 11, and the gap between the first sidewall 111 and the second sidewall 112 forms the return air inlet 11b and the air outlet 11c.

[0109] In some embodiments, the duct air conditioner 100 provided in this application also includes a heat exchanger 12, which is disposed in the inner cavity 11a. The heat exchanger 12 is mainly used to exchange heat with the air entering the inner cavity 11a, and the heat exchanger 12 is closer to the air outlet 11c than the return air outlet 11b, so that the air that has exchanged heat with the heat exchanger 12 can be blown into the indoor space through the air outlet 11c to change the air temperature of the indoor space.

[0110] In some embodiments, the duct air conditioner 100 provided in this application also includes a centrifugal fan assembly 13. The centrifugal fan assembly 13 is disposed in the inner cavity 11a and located between the first side wall 111 and the second side wall 112. The centrifugal fan assembly 13 and the heat exchanger 12 are spaced apart along a second preset direction f2. The centrifugal fan assembly 13 is closer to the return air port 11b than the air outlet 11c. The centrifugal fan assembly 13 is mainly used to provide power for the flow of air.

[0111] The second preset direction f2 and the first preset direction f1 are set at an angle, for example, the second preset direction f2 and the first preset direction f1 can be set at 90°, and the first preset direction f2 can be set to extend along the width direction of the housing 11.

[0112] Driven by the centrifugal fan assembly 13, air enters the inner cavity 11a from the return air inlet 11b and exchanges heat with the heat exchanger 12. The air after heat exchange with the heat exchanger 12, such as cooled cold air or heated hot air, is blown into the indoor space through the air outlet 11c to change the air temperature of the indoor space, such as lowering the air temperature of the indoor space or raising the air temperature of the indoor space.

[0113] In some embodiments, the duct air conditioner 100 provided in this application embodiment further includes a first shaft hole 14, which is formed on the centrifugal fan assembly 13 and passes through the centrifugal fan assembly 13 along a first preset direction f1.

[0114] In some embodiments, the duct air conditioner 100 provided in this application also includes a rotating shaft 15 and a threaded locking member (not shown). The rotating shaft 15 passes through the first shaft hole 14, and the rotating shaft 15 is fixed to the centrifugal fan assembly by the threaded locking member, so as to prevent the rotating shaft 15 from rotating relative to the first shaft hole 14 when rotating, but instead the rotating shaft 15 can drive the centrifugal fan assembly 13 to rotate together.

[0115] The threaded locking element can be a screw or bolt, etc., and the threaded locking element can be inserted into the centrifugal fan assembly and the rotating shaft to fix the centrifugal fan assembly and the rotating shaft; the rotating shaft 15 has a first end 15a and a second end 15b that are opposite each other in a first preset direction f1.

[0116] It should be noted that after the threaded locking parts are unscrewed, the rotating shaft 15 is no longer constrained by the centrifugal fan assembly 13, but can move relative to the first shaft hole 14 along the first preset direction f1.

[0117] In some embodiments, the duct air conditioner 100 further includes a drive motor 16, which may be directly or indirectly disposed on the second sidewall 112 and located in the inner cavity 11a. The drive motor 16 is connected to the second end 15b of the rotating shaft 15 so that the drive motor can be used to drive the centrifugal fan to rotate. Disposing of the drive motor 16 in the inner cavity 11a not only protects the drive motor 16 with the housing 11, preventing damage from collisions and thus extending its service life, but also shields the drive motor 16 from dust accumulation.

[0118] Please see Figures 1 to 3The drive motor 16 provided in this application embodiment includes an inner stator 161 and an outer rotor 162. The inner stator 161 is disposed on the second side wall 112, and the outer rotor 162 is connected to the second end 15b of the rotating shaft 15 to realize the connection between the drive motor 16 and the rotating shaft 15, thereby realizing the connection between the drive motor 16 and the centrifugal fan assembly 13. When the inner stator 161 and the outer rotor 162 interact, the outer rotor 162 rotates, synchronously driving the rotating shaft 15 and the centrifugal fan assembly 13 to rotate together, so that air enters the inner cavity 11a from the return air port 11b to exchange heat with the heat exchanger 12. The air after heat exchange is blown into the indoor space through the air outlet 11c to achieve the purpose of changing the indoor space temperature.

[0119] In some embodiments, the outer rotor 162 is nested on the outer side of the inner stator 161 in the radial direction. In conjunction with the design that the rotating shaft 15 can move relative to the first shaft hole 14 in the first preset direction f1 after the threaded locking member is unscrewed, it provides the possibility for the outer rotor 162 to move in the first preset direction f1 to be separated from the inner stator 161.

[0120] In other words, after the threaded locking parts are unscrewed, the outer rotor 162 and the shaft 15 in this application can move along the first preset direction f1, so that the outer rotor 162 is separated from the inner stator 161. The inner stator 161 is no longer constrained by the outer rotor 162, and the operating space for removing the inner stator 161 is also avoided. Thus, in the scenario where the drive motor 16 needs to be inspected or maintained, it is only necessary to unscrew the threaded locking parts and move the outer rotor 162 and the shaft 15 away from the inner stator 161 to avoid the need to remove the inner stator 16. With a flexible operating space of 1, the operator can remove the inner stator 161 from the return air vent 11b formed between the first side wall 111 and the second side wall 112. This allows the inner stator 161 to be removed from the return air vent 11b, thus enabling the drive motor 16 to be disassembled and its inner stator 161 removed for inspection and maintenance without disassembling parts such as the centrifugal fan assembly 13. This greatly improves the efficiency of inspection and maintenance of the drive motor 16, reduces inspection and maintenance costs, and helps to improve product competitiveness and user satisfaction.

[0121] In addition, since the drive motor 16 in this application is located inside the housing 11 near the return air vent 11b, the duct air conditioner 100 in this application does not need to have an inspection port on the building wall. During maintenance, the drive motor 16 can be directly maintained through the return air vent 11b, which is convenient.

[0122] In some embodiments, the centrifugal fan assembly 13 includes a plurality of centrifugal fans 131 arranged along a first preset direction f1, such as two, three, four, five, six or more centrifugal fans 131. The first shaft hole 14 includes a plurality of sub-shaft holes 141 in the same number as the centrifugal fans 131. A sub-shaft hole 141 is formed on a centrifugal fan 131 and a sub-shaft hole 141 passes through a centrifugal fan 131 along the first preset direction f1. The rotating shaft 15 is sequentially inserted into the plurality of sub-shaft holes 141.

[0123] This configuration allows multiple centrifugal fans 131 to share the same shaft 15, effectively merging the fan shafts of multiple centrifugal fans 131 into a single component. Compared to connecting the fan shafts of adjacent centrifugal fans 131 via couplings, this reduces the cumulative coaxiality tolerance between fan shafts, thereby significantly improving the coaxiality of each centrifugal fan 131. Consequently, it significantly improves the coaxiality between the centrifugal fan assembly 13 and the drive motor 16, facilitating the smooth rotation of multiple centrifugal fans 131 by the drive motor 16.

[0124] In addition, since two adjacent centrifugal fans 131 no longer need to be connected by a coupling, the use of couplings and other parts can be reduced. Instead, the rotating shaft 15 can be sequentially inserted into the sub-shaft holes 141 of multiple centrifugal fans 131 to connect each centrifugal fan 131 with the drive motor 16. The assembly method is relatively simple and helps to improve assembly efficiency. At the same time, since fewer parts are used in the duct air conditioner 100, the cost of the duct air conditioner 100 can be reduced.

[0125] Optionally, the outer rotor 162 and the shaft 15 can be installed separately or as a single unit. When the present application adopts the scheme of installing the outer rotor 162 and the shaft 15 as a single unit, compared with the separate installation of the outer rotor 162 and the shaft 15, the assembly error between the outer rotor 162 and the shaft 15 can be reduced, thereby improving the coaxiality of the outer rotor 162 and the shaft 15, and thus significantly improving the coaxiality of the centrifugal fan assembly 13 and the drive motor 16.

[0126] Optionally, the number of threaded locking elements can be the same as the number of centrifugal fans 131, and a centrifugal fan 131 can be fixed to the rotating shaft 15 by a threaded locking element.

[0127] In some embodiments, the drive motor 16 may be a magnetic levitation motor, and the outer rotor 162 and the inner stator 161 are locked together by levitation force. That is, the levitation force can provide axial and radial electromagnetic constraints to the outer rotor 162, so that the outer rotor 162 can rotate relative to the inner stator 161 while preventing the outer rotor 162 from detaching from the inner stator 161 along the axial direction.

[0128] Because the outer rotor 162 and inner stator 161 of the magnetic levitation motor are locked together by levitation force to achieve positioning, the rotation accuracy is guaranteed. Moreover, the outer rotor 162 and inner stator 161 can be positioned without contact. During the operation of the centrifugal fan assembly 13 driven by the drive motor 16, the outer rotor 162 and inner stator 161 rotate without contact, which isolates the vibration transmission between the centrifugal fan assembly 13 and the inner stator 161. At the same time, it greatly reduces the noise and vibration generated by mechanical friction, which greatly reduces the noise and vibration of the duct air conditioner 100, avoids the generation of abnormal sounds, and improves the user's comfort.

[0129] Understandably, since the outer rotor 162 and inner stator 161 of the magnetic levitation motor are locked by levitation force, when the levitation force is overcome, the outer rotor 162 and the shaft 15 can move away from the inner stator 161, allowing the outer rotor 162 to be separated from the inner stator 161 and creating space for removing the inner stator 161. Thus, in scenarios where the drive motor 16 needs inspection or maintenance, it is only necessary to move the outer rotor 162 and the shaft 15 away from the inner stator 161 to create space for removing the inner stator 161. The operator can then remove the inner stator 161 from the return air vent 11b formed between the first side wall 111 and the second side wall 112, allowing the inner stator 161 to be taken out from the return air vent 11b. In this way, the drive motor 16 can be disassembled and the inner stator 161 removed for inspection and maintenance without disassembling parts such as the centrifugal fan assembly 13.

[0130] Understandably, in other embodiments, an elastic element (such as a spring, silicone column, rubber column, or plastic column) can be provided between the rotating shaft 15 and the first sidewall 111 to provide axial elastic constraint for the outer rotor 162 using the elastic force of the elastic element, so as to prevent the outer rotor 162 from detaching from the inner stator 161 axially.

[0131] When the elastic force of the elastic element is overcome, the outer rotor 162 and the shaft 15 can move away from the inner stator 161. During this process, the elastic element is compressed and deformed, allowing the outer rotor 162 to separate from the inner stator 161. The inner stator 161 is no longer constrained by the outer rotor 162, and the operating space for removing the inner stator 161 is also cleared. Thus, in scenarios where the drive motor 16 needs inspection or maintenance, it is only necessary to move the outer rotor 162 and the shaft 15 away from the inner stator 161. The inner stator 161 is moved in the direction of the outer rotor 162, freeing up the operating space for removing the inner stator 161. The operator can then remove the inner stator 161 from the return air vent 11b formed between the first side wall 111 and the second side wall 112. This allows the inner stator 161 to be removed from the return air vent 11b. In this way, the drive motor 16 can be disassembled and the inner stator 161 of the drive motor 16 can be removed for inspection and maintenance without disassembling parts such as the centrifugal fan assembly 13.

[0132] In some embodiments, a through hole is provided on the first sidewall 111, extending along a first preset direction f1. The first end 15a of the rotating shaft 15 passes through the through hole on the first sidewall 111. When the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, the first end 15a of the rotating shaft 15 can move to the outside of the housing 11. This can prevent the first sidewall 111 from obstructing the movement of the outer rotor 162 and the rotating shaft 15 along the first preset direction f1. It can also support the first end 15a of the rotating shaft 15, preventing the first end 15a of the rotating shaft 15 from being suspended in the air. It can support the rotating shaft 15, prevent the rotating shaft 15 from bending, and facilitate the stable rotation of the rotating shaft 15 without shaking when it rotates with the outer rotor 162.

[0133] However, the applicant discovered that in the above solution, when the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, the first end 15a of the rotating shaft 15 will move to the outside of the housing 11. Therefore, it is necessary to reserve clearance space on the building wall to allow the rotating shaft 15 to move away from the inner stator 161. For example, clearance holes could be opened in the building wall so that the first end 15a of the rotating shaft 15 can extend into the clearance holes when the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, thus preventing the building wall from obstructing the movement of the outer rotor 162 and the rotating shaft 15. However, the installation of clearance holes increases the complexity of the ducted air conditioner 100 installation, resulting in relatively low installation efficiency.

[0134] In some embodiments, a blind hole is provided on the first sidewall 111. The blind hole passes through the surface of the first sidewall 111 facing the centrifugal fan assembly 13 along a first preset direction f1, but does not pass through the surface of the first sidewall 111 facing away from the centrifugal fan assembly 13. That is, the blind hole communicates with the internal space (i.e., the inner cavity 11a) of the housing 11, but does not directly communicate with the external space of the housing 11. The first end 15a of the rotating shaft 15 passes through the blind hole on the first sidewall 111, and the first end 15a of the rotating shaft 15 and the bottom surface of the blind hole are spaced apart, so that when the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, the first end 15a of the rotating shaft 15 can continue to extend into the blind hole without being blocked by the bottom surface of the blind hole and unable to move, thus avoiding the bottom surface of the blind hole from obstructing the movement of the outer rotor 162 and the rotating shaft 15.

[0135] By providing a blind hole communicating with the inner cavity 11a in the first sidewall 111, the first end 15a of the rotating shaft 15 can also be supported by the first sidewall 111, preventing the first end 15a of the rotating shaft 15 from being suspended in the air, supporting the rotating shaft 15, preventing the rotating shaft 15 from bending, and facilitating the stable rotation of the rotating shaft 15 without shaking when it rotates with the outer rotor 162; moreover, the first end 15a of the rotating shaft 15 will not move to be located outside the housing 11, so there is no need to open an avoidance hole in the building wall, which is beneficial to the installation efficiency of the duct machine 100.

[0136] However, the applicant discovered that in the above solution, the blind hole needs to have a sufficiently deep depth in the first preset direction f1 so that the first end 15a of the rotating shaft 15 can pass through the blind hole so that the first sidewall 111 can support the first end 15a of the rotating shaft 15, while the first end 15a of the rotating shaft 15 and the bottom surface of the blind hole are spaced apart. This requires increasing the thickness of the first sidewall 111 in the first preset direction f1 so that the first sidewall 111 has a sufficiently thick thickness to form a sufficiently deep blind hole, but this will increase the weight of the housing 11, thereby increasing the weight of the duct unit 100, which is not conducive to the lightweight design of the duct unit 100.

[0137] In some other embodiments, in conjunction with Figures 4 to 7As shown, the first end 15a of the rotating shaft 15 and the first sidewall 111 are spaced apart, and the distance between the first end 15a of the rotating shaft 15 and the first sidewall 111 in the first preset direction f1 is L1. After the threaded locking member is unscrewed, the rotating shaft 15 can move relative to the first shaft hole 14 and approach the first sidewall 111 along the first preset direction f1. The outer rotor 162 has a nested portion 162a nested in the inner stator 161. The size of the nested portion 162a in the first preset direction f1 is L2, where L2≤L1. After the threaded locking member is unscrewed, when the outer rotor 162 and the rotating shaft 15 can move along the first preset direction f1 and approach the first sidewall 111, the outer rotor 162 can separate relative to the inner stator 161.

[0138] By ensuring L2 ≤ L1, the distance the outer rotor 162 moves away from the inner stator 161 is greater than or equal to the nesting distance of the outer rotor 162 within the inner stator 161. This ensures that the outer rotor 162 can move a sufficient distance to completely separate from the inner stator 161, eliminating any rotor portion nested within the inner stator 161. This also frees the inner stator 161 from the constraints of the outer rotor 162 and provides sufficient operating space for removing the inner stator 161. Consequently, in scenarios requiring inspection or maintenance of the drive motor 16, only the threaded locking parts need to be unscrewed, and the outer rotor 162 can be removed. The rotor 162 and the shaft 15 move away from the inner stator 161, freeing the inner stator 161 from the constraint of the outer rotor 162 and creating space for removing the inner stator 161. The operator can then remove the inner stator 161 from the return air vent 11b formed between the first side wall 111 and the second side wall 112. This allows the inner stator 161 to be removed from the return air vent 11b, thus enabling the drive motor 16 to be disassembled and its inner stator 161 removed for inspection and maintenance without disassembling parts such as the centrifugal fan assembly 13. This greatly improves the efficiency of inspection and maintenance of the drive motor 16.

[0139] By setting the first end 15a of the rotating shaft 15 and the first sidewall 111 at intervals, the thickness of the first sidewall 111 in the first preset direction f1 can be smaller compared to the method of opening blind holes in the first sidewall 111, thereby reducing the weight of the housing 11 and the weight of the duct machine 100, which is conducive to realizing the lightweight design of the duct machine 100. Moreover, by eliminating the need for blind holes, through holes and other hole structures, the strength of the first sidewall 111 can be avoided.

[0140] Based on the spaced arrangement of the first end 15a of the rotating shaft 15 and the first sidewall 111, this application, in order to avoid opening holes in the first sidewall 111 and to avoid the first end 15a of the rotating shaft 15 being suspended, in some embodiments, such as Figure 4 and Figure 5As shown, the duct air conditioner 100 also includes a support bracket 17 disposed in the inner cavity 11a. The support bracket 17 is located between the centrifugal fan assembly 13 and the first side wall 111, and the surface of the support bracket 17 facing the centrifugal fan assembly 13 is provided with a second shaft hole 171, and the first end 15a of the rotating shaft 15 passes through the second shaft hole 171.

[0141] This configuration allows the support bracket 17 to support the first end 15a of the rotating shaft 15, preventing the first end 15a of the rotating shaft 15 from being suspended in the air. It also supports the rotating shaft 15, preventing it from bending and ensuring that the rotating shaft 15 can rotate stably without shaking when rotating with the outer rotor 162. At the same time, it eliminates the need for through holes, blind holes, or other hole structures on the first sidewall 111, thus avoiding any impact on the strength of the first sidewall 111. Furthermore, the thickness of the first sidewall 111 in the first preset direction f1 is not required to be very large, avoiding excessive thickness of the first sidewall 111 in the first preset direction f1. This reduces the weight of the housing 11 and the duct unit 100, thereby facilitating the lightweight design of the duct unit 100.

[0142] In addition, since the first end 15a of the rotating shaft 15 does not move to the outside of the housing 11, there is no need to open an avoidance hole in the building wall, which is beneficial to the installation efficiency of the duct unit 100.

[0143] In this application, the second shaft hole 171 can be a through hole or a blind hole.

[0144] Preferably, the second shaft hole 171 in this application is a through hole, that is, the second shaft hole 171 passes through the surface of the support bracket 17 facing away from the centrifugal fan assembly 13 along the first preset direction f1. At this time, the support bracket 17 and the first side wall 111 are spaced apart to form a moving space for the rotating shaft 15 to move between the support bracket 17 and the first side wall 111. When the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, the first end 15a of the rotating shaft 15 can be located in the moving space and will not be blocked by the first side wall 111 and unable to move, thus avoiding the first side wall 111 from obstructing the movement of the outer rotor 162 and the rotating shaft 15.

[0145] If the second shaft hole 171 is a blind hole, there needs to be a gap between the bottom surface of the second shaft hole 171 and the first end 15a of the rotating shaft 15 so that when the outer rotor 162 and the rotating shaft 15 move away from the inner stator 161, the first end 15a of the rotating shaft 15 can continue to extend into the second shaft hole 171 without being blocked by the bottom surface of the second shaft hole 171 and unable to move, thus avoiding the bottom surface of the second shaft hole 171 from obstructing the movement of the outer rotor 162 and the rotating shaft 15.

[0146] However, this requires the second shaft hole 171 to have a sufficiently deep depth in the first preset direction f1 so that the first end 15a of the rotating shaft 15 can pass through the second shaft hole 171 so that the support bracket 17 supports one end of the rotating shaft 15, while also creating a gap between the first end 15a of the rotating shaft 15 and the bottom surface of the second shaft hole 171. This requires increasing the thickness of the support bracket 17 in the first preset direction f1, so that the support bracket 17 has a sufficiently thick thickness to form a sufficiently deep second shaft hole 171.

[0147] Therefore, compared to setting the second shaft hole 171 as a blind hole, setting the second shaft hole 171 as a through hole that passes through the support bracket 17 along the first preset direction f1 does not require the support bracket 17 to be very thick in the first preset direction f1. This avoids the support bracket 17 being too thick in the first preset direction f1, thereby reducing the weight of the support bracket 17 and the duct machine 100, which is conducive to achieving the lightweight design of the duct machine 100.

[0148] In some embodiments, such as Figure 4 and Figure 5 As shown, the ducted air conditioner 100 also includes a partition 18 disposed in the inner cavity 11a. The partition 18 is connected between the first side wall 111 and the second side wall 112, dividing the inner cavity 11a into a return air cavity 11a1 and an outlet air cavity 11a2. The return air cavity 11a1 communicates with the return air outlet 11b, and the outlet air cavity 11a2 communicates with the outlet air outlet 11c. Furthermore, the partition 18 is provided with at least one ventilation opening 181 to allow the return air cavity 11a1 and the outlet air cavity 11a2 to communicate with each other. The heat exchanger 12 is disposed in the outlet air cavity 11a2, and the centrifugal fan assembly 13, the rotating shaft 15, and the drive motor 16 are all disposed in the return air cavity 11a1.

[0149] During the operation of the duct air conditioner 100, the drive motor 16 starts, and the outer rotor 162 drives the rotating shaft 15 and the centrifugal fan assembly 13 to rotate, so that air enters the return air chamber 11a1 from the return air inlet 11b, and under the drive of the centrifugal fan assembly 13, enters the outlet air chamber 11a2 through the vent 181 to exchange heat with the heat exchanger 12. The air after heat exchange by the heat exchanger 12, such as cooled cold air or heated hot air, is blown into the indoor space through the outlet air outlet 11c to change the air temperature of the indoor space, such as lowering the air temperature of the indoor space or raising the air temperature of the indoor space.

[0150] By setting a partition 18 to divide the inner cavity 11a into a return air cavity 11a1 and an outlet air cavity 11a2, the directional flow of air can be forced, so that the air flow inside the duct unit 100 is smooth, without turbulence, the heat exchange is stable, and the cooling or heating effect is better.

[0151] In some embodiments, the support bracket 17 is mounted on the partition 18 so that the support bracket 17 is spaced apart from the first sidewall 111.

[0152] This configuration, compared to additionally setting a support structure between the support bracket 17 and the first side wall 111 to support the support bracket 17 and achieve an interval between the support bracket 17 and the first side wall 111, directly installs the support bracket 17 onto the partition 18, reducing the use of a support structure and thus reducing the number of parts used in the duct air conditioner 100, thereby helping to reduce the cost of the duct air conditioner 100. At the same time, since the support bracket 17 and the first side wall 111 are spaced apart, the support bracket 17 is no longer set on the first side wall 111 through a support structure, which can reduce the load-bearing burden on the first side wall 111 and extend the service life of the first side wall 111.

[0153] If the support bracket 17 is fixed to the first side wall 111, the top wall or the bottom wall of the housing by means of threaded connection, the connection holes on the first side wall 111 or the top wall or the bottom wall of the housing 11 are difficult to see from the return air vent. This makes it difficult to align the connection holes on the support bracket 17 with the connection holes on the first side wall 111, the top wall or the bottom wall. As a result, the threaded fasteners are difficult to accurately pass through the connection holes on the first side wall 111, the top wall or the bottom wall. Moreover, the screwing in and screwing out directions of the threaded fasteners are inconsistent with the opening direction of the return air vent. The operating space is limited, which greatly increases the difficulty of disassembling and assembling the support bracket 17.

[0154] In addition, because the screwing direction of the threaded fasteners is inconsistent with the opening direction of the return air vent, it is difficult to tighten the threaded fasteners. This results in poor stability of the support bracket 17 on the first side wall 111, top wall, or bottom wall, making it difficult to support the rotating shaft 15 stably. Consequently, noise is easily generated during the operation of the centrifugal fan assembly 13. At the same time, since the first side wall 111 and bottom wall of the housing are exposed in the room, noise is more easily transmitted into the room, giving users a poor user experience.

[0155] Therefore, by fixing the support bracket 17 to the partition plate 18, the support bracket 17 and the partition plate 18 can be provided with connecting holes extending axially along the opening direction of the return air vent. During installation, the installer can directly see the connecting holes on the partition plate 18 from the return air vent, so as to align the connecting holes on the support bracket 17 with the connecting holes on the partition plate 18. This facilitates the insertion of threaded fasteners through the connecting holes on the support bracket 17 and the partition plate 18, and also makes it easier for the installer to tighten the threaded fasteners to stably fix the support bracket 17 to the partition plate 18. This helps to improve the installation stability of the support bracket 17, and also makes it easier to loosen the threaded fasteners to remove the support bracket 17 from the partition plate, thus improving the ease of disassembly and assembly of the support bracket 17.

[0156] Furthermore, as mentioned above, fixing the support bracket 17 to the partition plate 18 can improve the installation stability of the support bracket 17, thereby enabling the support bracket 17 to stably support the rotating shaft 15. This can reduce the probability of noise generated by the centrifugal fan assembly 13 during operation. Moreover, since the partition plate 18 is located in the inner cavity of the housing and is not exposed to the room, even if the centrifugal fan assembly 13 generates noise during operation, it will be blocked to a certain extent by the first side wall 111, the second side wall 112, the top wall and the bottom wall of the housing. This can reduce the probability of the noise generated by the centrifugal fan assembly 13 during operation being transmitted to the room, thereby improving the user's experience.

[0157] In some embodiments, such as Figure 4 and Figure 5 As shown, the duct unit 100 also includes a first bearing 19, which is disposed between the first end 15a of the rotating shaft 15 and the second shaft hole 171. This arrangement allows the first bearing 19 to support the first end 15a of the rotating shaft 15, reducing the coefficient of friction of the rotating shaft 15 during rotation relative to the second shaft hole 171 and ensuring its rotational accuracy. This, in turn, helps improve the rotational smoothness of the rotating shaft 15 and reduces noise generation.

[0158] In some embodiments, combined with Figures 5 to 8 As shown, the rotating shaft 15 includes a first shaft body 151 and a second shaft body 152. The first end 15a of the rotating shaft 15 is formed in the first shaft body. The first shaft body 151 passes through the first bearing 19. The second shaft body 152 is connected to the first shaft body 151 along the first preset direction f1. The second shaft body 152 is connected between the first shaft body 151 and the outer rotor 162. That is, the two ends of the second shaft body 152 are respectively connected to the first shaft body 151 and the outer rotor 162. The second shaft body 152 passes through the first shaft hole 14 and is fixed to the centrifugal fan assembly 13 by a threaded locking member. The radial dimension of the second shaft body 152 is larger than the radial dimension of the first shaft body 151.

[0159] With this configuration, the larger radial dimension of the second shaft 152 ensures the structural strength of the rotating shaft 15, providing sufficient structural strength to drive the centrifugal fan assembly 13 to rotate and ensuring the service life of the rotating shaft 15. Furthermore, the rotating shaft 15 can be adapted to the size of the first bearing 19, which is a standard component, by utilizing the size of the first shaft 151. This eliminates the need for additional customization of the first bearing 19, thereby reducing costs.

[0160] In some embodiments, such as Figure 7 and Figure 9As shown, the outer rotor 162 provided in this embodiment includes a rotor housing 1621 and a magnetic ring 1622. The rotor housing 1621 is sleeved on the outer side of the inner stator 161 in the radial direction, and the rotor housing 1621 is provided with a third shaft hole 16211 that passes through along a first preset direction f1. The magnetic ring 1622 is disposed inside the rotor housing 1621 and is nested on the outer side of the inner stator 161 in the radial direction. The magnetic ring 1622 is mainly used to work together with the winding of the inner stator 161 to generate a levitation force, so as to provide axial and radial electromagnetic constraints for the outer rotor 162 through the levitation force. This enables the outer rotor 162 to rotate relative to the inner stator 161 while preventing the outer rotor 162 from detaching from the inner stator 161 in the axial direction.

[0161] With this configuration, since the rotor housing 1621 is usually made of plastic, the cost is generally low. Compared to the rotor housing 1621 and magnetic ring 1622 being an integral structure, and the entire outer rotor 162 being made of magnetic material, the outer rotor 162 in this application adopts a structure that includes a separate rotor housing 1621 and magnetic ring 1622. This allows the material of the rotor housing 1621 to be different from that of the magnetic ring 1622, for example, by using lower-cost plastic, which helps to reduce the cost of the outer rotor 162.

[0162] In some embodiments, the inner stator 161 is provided with a central hole 1611 whose axis extends along a first preset direction f1. That is, the central hole 1611 extends axially along the first preset direction f1. The central hole 1611 communicates with the third shaft hole 16211. The second end 15b of the rotating shaft 15 passes through the third shaft hole 16211, the magnetic ring 1622 and the central hole 1611. When the rotating shaft 15 rotates with the outer rotor 162, the second end 15b of the rotating shaft 15 can rotate relative to the central hole 1611.

[0163] By passing the second end 15b of the rotating shaft 15 through the third shaft hole 16211 of the rotor housing 1621 and the hollow part of the magnetic ring 1622, and inserting it into the center hole 1611 of the inner stator 161, the outer rotor 162 can be supported radially by the inner stator 161 through the second end 15b of the rotating shaft 15. This ensures that the outer rotor 162 has sufficient radial support, improves the rotational smoothness of the outer rotor 162, and reduces noise generation.

[0164] In some embodiments, such as Figure 7 and Figure 9As shown, the duct unit 100 also includes a second bearing 20, which is disposed between the second end 15b of the rotating shaft 15 and the central hole 1611. This arrangement allows the second bearing 20 to support the second end 15b of the rotating shaft 15, reducing the coefficient of friction of the second end 15b during rotation relative to the central hole 1611 and ensuring its rotational accuracy. This, in turn, helps improve the rotational smoothness of the outer rotor 162 and reduces noise generation.

[0165] In some embodiments, the rotating shaft 15 further includes a third shaft 153, which is connected to the second shaft 152 along a first preset direction f1. The second end is formed in the third shaft 153, and the third shaft 153 passes through the second bearing 20. The radial dimension of the third shaft 153 is smaller than the radial dimension of the second shaft 152.

[0166] With this configuration, the larger radial dimension of the second shaft 152 ensures the structural strength of the rotating shaft 15, providing sufficient structural strength to drive the centrifugal fan assembly 13 to rotate and ensuring the service life of the rotating shaft 15. Furthermore, the rotating shaft 15 can be adapted to the size of the second bearing 20, which is a standard component, by utilizing the size of the third shaft 153. This eliminates the need for additional customization of the second bearing 20, thereby reducing costs.

[0167] Optionally, the second shaft 152 and / or the third shaft 153 may be fixed to the rotor housing 1621 by threaded fasteners (not shown) to ensure that the rotating shaft 15 can rotate together with the rotor housing 1621. Of course, in other embodiments, the second shaft 152 and / or the third shaft 153 may be fixed to the rotor housing 1621 by a snap-fit ​​structure.

[0168] Among them, threaded fasteners can be screws or bolts, etc.

[0169] In some embodiments, the duct unit 100 further includes an elastic bushing 21, such as a plastic bushing, silicone bushing, or rubber bushing, which is disposed between the second bearing 20 and the central hole 1611.

[0170] This configuration not only utilizes the elastic force of the elastic sleeve 21 to ensure that the second bearing 20 always fits against the hole wall of the central hole 1611, effectively preventing radial runout of the second bearing 20; it also utilizes the elastic deformation capability of the elastic sleeve 21 to absorb some of the impact energy, thereby achieving the purpose of vibration reduction and noise reduction.

[0171] In some embodiments, such as Figure 10As shown, the duct air conditioner provided in this application embodiment also includes an electrical box 22, which is disposed on the second side wall 112 and located in the inner cavity 11a. The electrical box includes a box body and electronic components. The box body is disposed on the second side wall 112, and the electronic components are disposed in the box body. The inner stator 161 of the drive motor is disposed on the box body of the electrical box 22, and the inner stator is electrically connected to the electrical components of the electrical box 22.

[0172] This arrangement allows the electrical box 22 and the drive motor 16 to be located on the same side of the centrifugal fan assembly 13, facilitating the wiring connection between the two, avoiding excessively long wiring, thus simplifying the wiring layout, making the wiring neater, and ensuring reliable electrical conductivity between the two.

[0173] In some embodiments, such as Figure 10 As shown, the inner stator 161 includes a stator housing 1612, a stator support 1613, a stator winding 1614, and a stator protective cover 1615. The stator housing 1612 is detachably mounted on the second side wall 112. The stator support 1613 is mounted on the stator housing 1612. The stator winding 1614 can be mounted inside the stator housing 1612 through the stator support 1613. The stator protective cover 1615 is detachably mounted on the stator housing 1612 and together with the stator housing 1612 and the box body of the electrical box 22, forms an open receiving cavity. The stator winding 1614 is located in the receiving cavity. A central hole 1611 is formed on the stator winding 1614. The outer rotor 162 is sleeved on the radially outer side of the stator winding 1614 and is at least partially located in the receiving cavity.

[0174] When inspecting and maintaining the drive motor 16, the outer rotor 162 and shaft 15 are moved away from the inner stator 161, freeing the inner stator 161 from the constraint of the outer rotor 162. This movement creates space for disassembling the inner stator 161, allowing the stator protective cover 1615 to be removed. Then, the stator housing 1612 is removed from the electrical box 22, enabling the stator housing 1612, stator support 1613, and stator windings 1614 to be removed as a whole for inspection and maintenance. This simple inspection and maintenance method significantly improves the efficiency of inspecting and maintaining the drive motor 16.

[0175] In this application, for ease of description, such as Figure 10 and Figure 11 As shown, the direction perpendicular to the first preset direction f1 and the second preset direction f2 is configured as the third preset direction f3, wherein the third preset direction f3 extends along the thickness direction of the housing 11. It is understood that the above definitions are merely for the convenience of describing this application and should not be construed as limiting the scope of protection of this application.

[0176] In some embodiments, combined with Figures 9 to 12 As shown, the support bracket 17 includes a support plate 172 and a fixing plate 173. A second shaft hole 171 is formed on the support plate 172 so that the support plate 172 is used to support the first end 15a of the rotating shaft 15. The support plate 172 is spaced apart from the first side wall 111, and the aforementioned moving space is formed between the support plate 172 and the first side wall 111. The fixing plate 173 is connected to the support plate 172 and is fixedly connected to the partition plate 18.

[0177] This configuration allows the support plate 172 to support the first end 15a of the rotating shaft 15, and the fixing plate 173 to provide a fixed position for the support plate 172, so as to facilitate the fixed connection between the support plate 172 and the partition plate 18.

[0178] In some embodiments, the end of the support plate 172 in the second predetermined direction f2 has a first abutment plate 174 that bends and extends away from the first sidewall 111, and the first abutment plate 174 abuts against the partition 18. In this way, the contact area between the support plate 172 and the partition 18 can be increased by using the first abutment plate 174, which is beneficial to improving the stability of the support bracket 17 on the partition 18.

[0179] In some embodiments, the support bracket 17 further includes a side plate 175, which is connected to the side of the support plate 172 in the third preset direction f3 and is located between the support plate 172 and the first side wall 111. The side plate 175 in the second preset direction f2 has a side portion that bends and extends toward the support plate 172 to form a second abutment plate 176. The second abutment plate 176 and the first abutment plate 174 are respectively located on both sides of the support plate 172 in the first preset direction f1, and the second abutment plate 176 abuts against the partition plate 18. The second abutment plate 176 constitutes a fixing plate and is fixedly connected to the partition plate 18 to achieve a fixed connection between the support plate 172 and the partition plate 18.

[0180] This not only increases the contact area between the support plate 172 and the partition plate 18 by using the first abutment plate 174, but also increases the contact area between the support plate 172 and the partition plate 18 by using the second abutment plate 176. This significantly increases the contact area between the support plate 172 and the partition plate 18, so that during assembly, the support bracket 17 can be stably abutted against the partition plate 18, and the support bracket 17 can be stably fixed to the partition plate 18 by the second abutment plate 176, so that the support bracket 17 can be more stably fixed to the partition plate 18.

[0181] For example, the partition 18 is provided with a first connection hole, the second abutment plate 176 is provided with a second connection hole, and the duct machine 100 also includes a threaded fastener (not shown), and the first connection hole and the second connection hole are connected by the threaded fastener.

[0182] Alternatively, the threaded fastener may be a screw or bolt, etc.

[0183] Understandably, when the threaded fastener is a screw, the first connecting hole is a threaded hole, while the second connecting hole can be either a threaded hole or a smooth hole. When the threaded fastener is a bolt, both the first and second connecting holes can be threaded holes or both can be smooth holes. In this case, the threaded fastener passes through both the second and first connecting holes, and then a nut is used to thread it onto the fastener, thus achieving the connection and fixation between the first and second connecting holes.

[0184] Optionally, there are two side plates 175. One side plate 175 is connected to one side of the support plate 172 in the third preset direction f3, and the side plate 175 in the second preset direction f2 has a bent extension towards the support plate 172 to form a second abutment plate 176. The other side plate 175 is connected to the other side of the support plate 172 in the third preset direction f3, and the side plate 175 in the second preset direction f2 has a bent extension towards the support plate 172 to form a second abutment plate 176. Thus, there are two second abutment plates 176, so that the support plate 172 can be fixedly connected to the partition plate 18 through the two second abutment plates 176, which can increase the connection area between the support plate 172 and the partition plate 18 and improve the connection stability of the support plate 172 on the partition plate 18.

[0185] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0186] Furthermore, the embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the content of this specification should not be construed as a limitation of this application, and the protection scope of this application should be determined by the appended claims.

Claims

1. A ducted air conditioner, characterized in that, The duct unit includes: A housing having an inner cavity, and having a first sidewall and a second sidewall that are opposite to and spaced apart in a first predetermined direction; A heat exchanger, wherein the heat exchanger is disposed in the inner cavity; An electrical box, the electrical box being disposed on the second side wall, and the electrical box comprising: The box body, which is disposed on the second side wall; and Electronic device, wherein the electronic device is disposed in the housing; A centrifugal fan assembly is disposed in the inner cavity and located between the first side wall and the second side wall, and the centrifugal fan assembly and the heat exchanger are spaced apart along a second preset direction; A first shaft hole is formed on the centrifugal fan assembly, and the first shaft hole penetrates the centrifugal fan assembly along the first preset direction; A rotating shaft, which passes through the first shaft hole and has a first end and a second end that are opposite to each other in the first preset direction; A drive motor is located in the inner cavity and is mounted on the housing of the electrical box. The drive motor is connected to the second end of the rotating shaft and is used to drive the centrifugal fan assembly to rotate. The drive motor includes: An inner stator, the inner stator being disposed on the housing of the electrical box and electrically connected to the electronic components of the electrical box; and, An outer rotor, nested on the outer side of the inner stator radially, and connected to the second end; and, The centrifugal fan assembly is fixed to the rotating shaft by the threaded locking member. After the threaded locking member is unscrewed, the outer rotor and the rotating shaft can move along the first preset direction so that the outer rotor is separated from the inner stator.

2. The duct air conditioner according to claim 1, characterized in that, The first end and the first sidewall are spaced apart, and the distance between the first end and the first sidewall is L1 in the first preset direction. After the threaded locking member is unscrewed, the rotating shaft can move relative to the first shaft hole and approach the first sidewall in the first preset direction. The outer rotor has a nested portion nested within the inner stator. The size of the nested portion in the first preset direction is L2, where L2 ≤ L1, so that when the threaded locking member is unscrewed, the outer rotor can separate relative to the inner stator when the outer rotor and the shaft can move along the first preset direction to approach the first side wall.

3. The duct air conditioner according to claim 1, characterized in that, The drive motor is a magnetic levitation motor.

4. The duct air conditioner according to claim 1, characterized in that, The duct unit also includes a support bracket disposed in the inner cavity. The support bracket is located between the centrifugal fan assembly and the first side wall. The surface of the support bracket facing the centrifugal fan assembly is provided with a second shaft hole, and the first end of the rotating shaft passes through the second shaft hole.

5. The duct air conditioner according to claim 4, characterized in that, The second shaft hole penetrates the surface of the support bracket facing away from the centrifugal fan assembly along the first preset direction, and the support bracket and the first side wall are spaced apart to form a moving space for the rotating shaft to move between the support bracket and the first side wall.

6. The duct air conditioner according to claim 5, characterized in that, The ducted air handling unit also includes a partition disposed in the inner cavity. The partition is connected between the first side wall and the second side wall and divides the inner cavity into a return air cavity and an outlet air cavity. The partition is provided with at least one ventilation opening so that the return air cavity and the outlet air cavity are interconnected. The heat exchanger is disposed in the outlet air cavity, and the centrifugal fan assembly, the rotating shaft and the drive motor are all disposed in the return air cavity. The support bracket is installed and connected to the partition.

7. The duct air conditioner according to claim 6, characterized in that, The support bracket includes: A support plate, wherein the second shaft hole is formed on the support plate so that the support plate is used to support the first end of the rotating shaft, and the support plate is spaced apart from the first sidewall, forming the moving space between the support plate and the first sidewall; and, A fixing plate is connected to the support plate and is fixedly connected to the partition plate.

8. The duct air conditioner according to claim 7, characterized in that, The direction perpendicular to the first preset direction and the second preset direction is configured as the third preset direction; The end of the support plate in the second preset direction has a first abutting plate that bends and extends away from the first sidewall, and the first abutting plate abuts against the partition plate. The support bracket further includes a side plate, which is connected to the side of the support plate in the third preset direction and located between the support plate and the first side wall. The side plate in the second preset direction has a side portion that bends and extends toward the support plate to form a second abutment plate. The second abutment plate abuts against the partition plate and constitutes the fixing plate. The second abutment plate is fixedly connected to the partition plate.

9. The duct air conditioner according to claim 4, characterized in that, The duct machine also includes a first bearing, which is disposed between the first end and the second shaft hole.

10. The duct air conditioner according to claim 9, characterized in that, The rotating shaft includes: A first shaft body, the first end formed in the first shaft body, the first shaft body passing through the second shaft hole; and... The second shaft is connected to the first shaft along the first preset direction, and the second shaft passes through the first shaft hole and is fixed to the centrifugal fan assembly by the threaded locking member. The radial dimension of the second shaft is greater than that of the first shaft.

11. The duct air conditioner according to any one of claims 1-10, characterized in that, The outer rotor includes: A rotor housing, wherein the rotor housing is sleeved on the outer side of the inner stator in the radial direction, and the rotor housing is provided with a third shaft hole extending along the first preset direction; and, A magnetic ring is disposed inside the rotor housing and nested on the outer side of the inner stator in the radial direction; The inner stator is provided with a central hole whose axis extends along the first preset direction. The second end of the rotating shaft passes through the third shaft hole, the magnetic ring and the central hole. When the rotating shaft rotates with the outer rotor, the second end can rotate relative to the central hole.

12. The duct air conditioner according to claim 11, characterized in that, The duct unit also includes a second bearing, which is disposed between the second end and the central hole.

13. The duct air conditioner according to claim 12, characterized in that, The rotating shaft includes: A second shaft, which passes through the first shaft hole and is fixed to the centrifugal fan assembly by the threaded locking member; and... A third shaft is connected to the second shaft along the first preset direction, and the second end is formed on the third shaft. The radial dimension of the third shaft is smaller than the radial dimension of the second shaft.

14. The duct air conditioner according to claim 12, characterized in that, The duct unit also includes an elastic bushing, which is disposed between the second bearing and the central hole.

15. The ductwork unit according to any one of claims 1-10, characterized in that, The centrifugal fan assembly includes a plurality of centrifugal fans arranged along the first preset direction. The first shaft hole includes a plurality of sub-shaft holes in the same number as the centrifugal fans. One sub-shaft hole is formed on one centrifugal fan, and one sub-shaft hole passes through one centrifugal fan along the first preset direction. The rotating shaft passes through the plurality of sub-shaft holes.

16. The duct air conditioner according to any one of claims 1-10, characterized in that, The inner stator includes: A stator housing, which is detachably mounted on the housing of the electrical box; A stator support, which is mounted on the stator housing; Stator windings, the stator windings being mounted within the stator housing via the stator bracket; and, A stator protective cover is detachably mounted on the stator housing and forms an open receiving cavity with the stator housing and the second side wall. The stator winding is located in the receiving cavity, and the outer rotor is sleeved on the outer side of the stator winding in the radial direction and is at least partially located in the receiving cavity.

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