An air conditioner indoor unit

Abstract

The application relates to the household electrical appliance technical field and discloses an indoor unit of an air conditioner, which comprises a machine shell, the machine shell is provided with a machine shell air inlet and a machine shell air outlet, a machine shell containing cavity is formed in the machine shell, a heat exchanger, a cross-flow fan, a driving motor and a bearing are arranged in the machine shell containing cavity, the cross-flow fan comprises a fan end cover and a fan shaft, the driving motor comprises an outer rotor and an inner stator, the inner stator is provided with a shaft hole; the bearing is arranged in the shaft hole, the fan shaft is arranged in the bearing along the axial direction of the cross-flow fan; the inner stator is also provided with a heat dissipation hole, the heat dissipation hole penetrates the inner stator along the axial direction of the driving motor and is arranged in the interval of the shaft hole; the cross-flow fan further comprises a plurality of heat dissipation blades, which are arranged on the side of the fan end cover facing the driving motor and are arranged in the interval along the circumferential direction of the fan shaft; when the cross-flow fan rotates, the plurality of heat dissipation blades can be driven to rotate, so that the heat dissipation hole forms a heat dissipation airflow, and the heat dissipation of the bearing is realized.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, and more particularly to an indoor unit for an air conditioner. Background Technology

[0002] The field of home appliance technology encompasses a wide range of product categories, including but not limited to refrigerators, washing machines, air conditioners, microwave ovens, dishwashers, and vacuum cleaners. The technological development trends for these products primarily focus on intelligentization, energy conservation and environmental protection, optimized user experience, and the application of new materials. Optimized user experience is achieved through design innovation and functional enhancement to meet consumers' demands for health, convenience, and personalization.

[0003] The indoor unit of the air conditioner has a cross-flow fan installed inside the casing. The cross-flow fan draws indoor air into the casing through the air inlet and out through the air outlet. The drive motor is connected to the heat exchange fan to drive its rotation. When the drive motor is set to an external rotor motor, the lever arm is shorter, which can improve torque and efficiency.

[0004] The fan shaft of a cross-flow fan is rotatably connected to a shaft hole via bearings. Due to the compact structure of the motor and limited heat dissipation conditions, the frictional heat generated by the bearings during high-speed operation is difficult to dissipate quickly, resulting in high temperatures. This not only limits further increases in motor power but also accelerates bearing wear and aging, significantly shortening its service life and affecting the long-term stable operation of the air conditioner's indoor unit. Utility Model Content

[0005] This application discloses an indoor air conditioner unit in which a cross-flow fan, when rotating, can drive multiple heat dissipation blades to rotate, thereby forming a heat dissipation airflow in the heat dissipation holes and thus achieving heat dissipation for the bearings.

[0006] To achieve the above objectives, this application discloses an indoor air conditioning unit, comprising: a casing, wherein the casing is provided with a casing air inlet and a casing air outlet, and a casing receiving cavity is formed inside the casing, wherein the casing receiving cavity is provided with: a heat exchanger, the heat exchanger being used to exchange heat with the airflow flowing through the casing air inlet; a cross-flow fan, the cross-flow fan being used to introduce airflow from the casing air inlet into the casing, and after heat exchange by the heat exchanger, deliver the airflow to the room through the casing air outlet, the cross-flow fan comprising: a fan end cover, disposed at one end of the cross-flow fan along its own axial direction; a fan shaft, disposed at the fan end cover; and a drive motor, the drive motor being used to drive the cross-flow fan. The fan rotates, and the drive motor includes: an outer rotor connected to the fan end cover; an inner stator disposed inside the outer rotor, the inner stator having a shaft hole; a bearing disposed in the shaft hole, the fan shaft passing through the bearing along the axial direction of the cross-flow fan; the inner stator also has: heat dissipation holes, the heat dissipation holes passing through the inner stator along the axial direction of the drive motor and spaced apart from the shaft hole; the cross-flow fan also includes: multiple heat dissipation blades disposed on the side of the fan end cover facing the drive motor and arranged circumferentially along the fan shaft, when the cross-flow fan rotates, it can drive the multiple heat dissipation blades to rotate, so that heat dissipation airflow is formed in the heat dissipation holes.

[0007] In this way, heat dissipation fins are added to the fan end cover of the cross-flow fan. The rotational power of the cross-flow fan driven by the drive motor directly drives the heat dissipation fins to rotate. At the same time, through-hole heat dissipation holes are set in the inner stator. Driven by the heat dissipation fins, heat dissipation airflow is generated in the heat dissipation holes. Heat dissipation of the bearing can be achieved without the need for an additional motor or fan. The continuous removal of heat from the bearing by the heat dissipation airflow can effectively control the operating temperature of the bearing, avoiding problems such as material performance degradation (such as reduced bearing steel hardness) and accelerated grease aging caused by high temperature. This ensures the long-term stable operation of the drive motor, reduces the probability of air conditioner maintenance due to motor failure, and improves the overall reliability and durability of the equipment. The setting of heat dissipation fins and heat dissipation holes does not occupy the space of the indoor unit of the air conditioner. The overall structure is simple, reducing the manufacturing cost and assembly complexity of the equipment, avoiding the increased energy consumption caused by an additional power source, and achieving good heat dissipation of the bearing.

[0008] As an optional implementation, the fan end cover is provided with a plurality of ventilation holes, each ventilation hole being disposed on two adjacent heat dissipation blades, and the ventilation holes communicating with the heat dissipation holes so that the heat dissipation airflow flows through the ventilation holes along the axial direction of the fan end cover.

[0009] In this way, the ventilation holes and heat dissipation holes are connected. The rotation of the heat dissipation blades generates axial airflow. The airflow passes through the ventilation holes, through the fan end cover, and into the heat dissipation holes or the interior of the cross-flow fan. This straight axial through path reduces the resistance and loss of airflow during transmission, allowing the heat dissipation airflow to act more smoothly and directly on the heat-generating areas of the bearing and inner stator, thereby improving heat dissipation efficiency.

[0010] As an optional implementation, the heat dissipation blades are arc-shaped strips and protrude from the side of the fan end cover facing the drive motor.

[0011] In this way, when the blades rotate, the arc-shaped blades can drive the air near the axis and guide it radially outward along the arc tangent direction through centrifugal force. Multiple cooling blades in this way form a centrifugal fan. The airflow enters from the cooling hole along the axis and flows out radially, or the airflow is drawn in radially by the blades and then enters the cooling hole along the axis, thereby achieving good heat dissipation for the bearing.

[0012] As an optional implementation, along the axial direction of the cross-flow fan, the distance between the side of the heat dissipation blade facing away from the fan end cover and the side of the inner stator facing the fan end cover is 3mm to 5mm.

[0013] If the distance between the side of the heat dissipation fins away from the fan end cover and the side of the inner stator facing the fan end cover is less than 3mm, the cross-flow fan will generate a certain amount of vibration during the operation of the indoor unit of the air conditioner. If the gap between the heat dissipation fins and the inner stator is too small, the two are very likely to collide or rub against each other due to vibration, causing wear or even jamming of the parts, which seriously affects the normal operation and service life of the equipment and cannot guarantee the stable operation of the drive motor and the cross-flow fan.

[0014] If the distance is greater than 5mm, the gap between the heat dissipation blades and the inner stator will be too large, which will occupy extra space in the housing cavity, which is not conducive to the miniaturization and integration of the equipment.

[0015] When this distance is between 3mm and 5mm, it effectively avoids interference between the heat dissipation fins and the inner stator due to vibration, ensuring a safe distance between them during operation and guaranteeing stable equipment operation. It also allows the cooling airflow generated by the rotation of the heat dissipation fins to enter the heat dissipation holes of the inner stator with high efficiency, reducing airflow diffusion and loss, and improving heat dissipation. At the same time, this gap range does not excessively occupy the space of the housing cavity, balancing equipment safety, heat dissipation efficiency, and structural compactness, achieving an optimized balance of multiple performance aspects.

[0016] As an optional implementation, the fan end cover has a limiting rib on the side facing the drive motor. The limiting rib is annular, and the center of the limiting rib is located on the axis of the fan shaft. The inner stator is disposed inside the limiting rib. The limiting rib is configured to restrict the position of the drive motor relative to the cross-flow fan. The heat dissipation blades are disposed between the fan shaft and the limiting rib.

[0017] Thus, the limiting ribs radially restrict the position of the inner stator of the drive motor. During the assembly of the indoor unit of the air conditioner, the limiting ribs serve as a positioning reference, ensuring the coaxiality of the drive motor and the cross-flow fan, and preventing misalignment of their axes due to assembly deviations. When the cross-flow fan rotates at high speed, coaxial positioning reduces the relative wobble between the drive motor and the fan end cover, reduces vibration and noise caused by eccentric rotation, and avoids abnormal friction between components caused by positional misalignment, ensuring long-term stable operation of the equipment.

[0018] As an optional implementation, multiple heat dissipation blades together form an air inlet cavity, which is connected to the heat dissipation hole and is opposite to it along the axial direction of the drive motor.

[0019] Thus, when the cooling fins rotate with the cross-flow fan, the air inlet cavity and the heat dissipation holes are aligned axially with the drive motor, creating a shorter airflow channel between them. The airflow generated by the rotating cooling fins converges within the air inlet cavity and can flow directly axially towards the heat dissipation holes. Alternatively, the rotation of the cooling fins can directly drive the airflow within the heat dissipation holes towards the air inlet cavity and then flow radially out. This reduces path loss and turbulence interference during airflow transmission. This axially aligned structure allows for smoother airflow into and out of the heat dissipation holes, ensuring that airflow energy is concentrated on the heat-generating components (bearings) and improving heat exchange efficiency.

[0020] As an optional implementation, the indoor unit of the air conditioner further includes: a base disposed within the housing cavity, wherein a heat exchange air duct is formed within the base, and the cross-flow fan is disposed within the heat exchange air duct; the drive motor further includes: a motor housing covering the inner stator and the outer rotor and connected to the base, wherein a first gap is formed between the motor housing and the fan end cover, and the air inlet cavity is connected to the housing cavity through the first gap; a motor end cover disposed at the end of the motor housing away from the cross-flow fan, wherein a second gap is formed between the motor end cover and the motor housing, and the heat dissipation hole is connected to the housing cavity through the second gap; the housing cavity, the first gap, the air inlet cavity, and the second gap together form a heat dissipation channel, so that when the cross-flow fan rotates, the heat dissipation airflow is formed within the heat dissipation channel.

[0021] Thus, when the cross-flow fan rotates, air from the housing cavity enters the motor housing through the second gap, then exchanges heat with the bearings through the heat dissipation holes before flowing into the air intake cavity. Afterward, it flows radially out of the motor housing through the first gap. Alternatively, air from the housing cavity enters the motor housing through the first gap, then flows axially into the heat dissipation holes through the air intake cavity, exchanges heat with the bearings, and finally flows out of the motor housing through the second gap. This orderly airflow along the heat dissipation channel prevents disordered diffusion of the airflow, ensuring continuous airflow through the heat dissipation holes of the drive motor to cool the bearings, significantly improving the continuity and stability of heat dissipation. This design, based on the existing structure, makes the heat dissipation structure (heat dissipation holes, heat dissipation blades) more coordinated with the overall layout of the indoor unit of the air conditioner, without occupying a large amount of additional space.

[0022] As an optional implementation, the inner stator includes: a stator encapsulation, the stator encapsulation having: a shaft hole; a plurality of mounting cavities arranged circumferentially around the shaft hole and radially spaced from the shaft hole; a stator core disposed in the mounting cavities; a stator winding wound around the stator core; and a heat dissipation hole located between the shaft hole and the mounting cavities along the radial direction of the shaft hole, the heat dissipation hole penetrating the stator encapsulation along the axial direction of the shaft hole.

[0023] Thus, with the heat dissipation holes located between the shaft hole and the mounting cavity, on the one hand, the heat around the bearing can be more easily dissipated radially through the stator plastic seal to the heat dissipation area, reducing the temperature around the bearing; on the other hand, it can also accelerate the heat exchange between the stator core and the outside world, indirectly reducing the thermal impact on the bearing, ultimately alleviating the high temperature problem of the bearing, and improving the motor's power output capacity and service life.

[0024] As an optional implementation, the heat dissipation holes include a plurality of holes, which are circumferentially spaced around the shaft hole.

[0025] In this way, multiple heat dissipation holes are distributed circumferentially along the shaft hole, forming an annular heat dissipation zone between the stator plastic-sealed shaft hole and the mounting cavity. This prevents the heat of the bearing from accumulating in a certain area, and the frictional heat generated by the sliding parts of the bearing can also be quickly dissipated through the surrounding heat dissipation holes, making the temperature distribution around the shaft hole more even.

[0026] As an optional implementation, the heat dissipation hole has a fan-shaped cross-section along the axial direction perpendicular to the shaft hole.

[0027] Thus, the fan-shaped cross-section radiates outwards from the shaft hole, with its two sides extending radially and its arc-shaped edges arranged radially. This structure allows for more efficient use of the limited radial and circumferential dimensions within the annular space between the shaft hole and the mounting cavity. Compared to circular or square cross-sections, the fan-shaped cross-section has a larger area, accelerating heat conduction to the air within the heat dissipation holes and improving convective heat dissipation efficiency. Furthermore, the straight sides of adjacent fan-shaped heat dissipation holes can be closely arranged, avoiding the waste of gaps that occur when circular holes are arranged circumferentially. This allows for the arrangement of more heat dissipation holes within the same circumferential space, or increases the effective heat dissipation area of ​​a single heat dissipation hole.

[0028] Compared with the prior art, the beneficial effects of this application are:

[0029] The air conditioner indoor unit provided in this application embodiment has heat dissipation fins added to the fan end cover of the cross-flow fan. The rotational power of the cross-flow fan driven by the drive motor directly drives the heat dissipation fins to rotate. At the same time, by setting through heat dissipation holes on the inner stator, heat dissipation airflow is generated in the heat dissipation holes under the action of the heat dissipation fins. Heat dissipation can be achieved for the bearing without the need for an additional motor or fan. By continuously removing heat from the bearing through the heat dissipation airflow, the operating temperature of the bearing can be effectively controlled, avoiding problems such as material performance degradation (such as reduced bearing steel hardness) and accelerated grease aging caused by high temperature. This ensures long-term stable operation of the drive motor, reduces the probability of air conditioner maintenance due to motor failure, and improves the overall reliability and durability of the equipment. Attached Figure Description

[0030] 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.

[0031] Figure 1 This is a schematic diagram of the air conditioner indoor unit from a first-view perspective, as disclosed in an embodiment of this application.

[0032] Figure 2 This is a schematic diagram of the air conditioner indoor unit disclosed in the embodiments of this application from a second perspective;

[0033] Figure 3 This is a schematic diagram of the air conditioner indoor unit disclosed in the embodiments of this application, omitting the casing and part of the internal structure;

[0034] Figure 4 for Figure 2 Sectional view at point AA (part of the casing and part of the cross-flow fan omitted);

[0035] Figure 5 for Figure 4A magnified view of a section at point B in the middle;

[0036] Figure 6 This is an exploded view of the drive motor disclosed in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the inner stator disclosed in an embodiment of this application from a first-view perspective.

[0038] Figure 8 This is a schematic diagram of the inner stator disclosed in an embodiment of this application from a second perspective.

[0039] Figure 9 for Figure 8 Sectional view at CC;

[0040] Figure 10 This is a schematic diagram of the structure of the fan end cover disclosed in an embodiment of this application.

[0041] Explanation of reference numerals in the attached figures:

[0042] 100-Indoor unit of air conditioner; 1-Casing; 1a-Casing air inlet; 1b-Casing air outlet; 2-Heat exchanger; 3-Cross-flow fan; 31-Fan end cover; 311-Heat dissipation blades; 311a-Air inlet cavity; 312-Fan shaft; 313-Limiting rib; 4-Drive motor; 41-Outer rotor; 42-Inner stator; 421-Stator encapsulation; 421a-Shaft hole; 421b-Mounting cavity; 4211-Heat dissipation hole; 422-Stator core; 423-Stator winding; 43-Motor housing; 43a-First gap; 44-Motor end cover; 44a-Second gap; 45-Shock absorber; 5-Bearing; 51-Shaft sleeve; 52-Sliding component; 6-Base. Detailed Implementation

[0043] The technical solutions of the 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 skilled in the art without creative effort are within the scope of protection of this application.

[0044] In this application, the terms "upper," "lower," "front," "top," "bottom," "inner," "outer," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0045] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0046] Furthermore, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0047] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0048] The field of home appliance technology encompasses a wide range of product categories, including but not limited to refrigerators, washing machines, air conditioners, microwave ovens, dishwashers, and vacuum cleaners. The technological development trends for these products primarily focus on intelligentization, energy conservation and environmental protection, optimized user experience, and the application of new materials. Optimized user experience is achieved through design innovation and functional enhancement to meet consumers' demands for health, convenience, and personalization.

[0049] The indoor unit of the air conditioner has a cross-flow fan installed inside the casing. The cross-flow fan draws indoor air into the casing through the air inlet and out through the air outlet. The drive motor is connected to the heat exchange fan to drive its rotation. When the drive motor is set to an external rotor motor, the lever arm is shorter, which can improve torque and efficiency.

[0050] The fan shaft of a cross-flow fan is rotatably connected to a shaft hole via bearings. Due to the compact structure of the motor and limited heat dissipation conditions, the frictional heat generated by the bearings during high-speed operation is difficult to dissipate quickly, resulting in high temperatures. This not only limits further increases in motor power but also accelerates bearing wear and aging, significantly shortening its service life and affecting the long-term stable operation of the air conditioner's indoor unit.

[0051] Based on this, this application discloses an indoor air conditioner unit. When the cross-flow fan rotates, it can drive multiple heat dissipation blades to rotate, so that heat dissipation airflow is formed in the heat dissipation holes, thereby achieving heat dissipation of the bearing. Without occupying extra space, heat dissipation blades combined with heat dissipation holes are set on the fan end cover, which can achieve a good heat dissipation effect on the bearing.

[0052] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0053] Please see Figures 1 to 5 and Figure 10 , Figure 1 This is a schematic diagram of the air conditioner indoor unit 100 disclosed in the embodiments of this application from a first-view perspective; Figure 2 This is a structural schematic diagram of the air conditioner indoor unit 100 disclosed in the embodiments of this application from a second perspective; Figure 3 This is a schematic diagram of the air conditioner indoor unit 100 disclosed in this application, omitting the casing 1 and part of the internal structure; Figure 4 for Figure 2 Sectional view at point AA (part of the casing 1 and part of the cross-flow fan 3 are omitted); Figure 5 for Figure 4 A magnified view of a portion at point B. This application discloses an indoor air conditioning unit 100.

[0054] The indoor unit 100 of the air conditioner includes a housing 1, which is provided with a housing air inlet 1a and a housing air outlet 1b, and a housing receiving cavity 1c is formed inside the housing 1.

[0055] In some embodiments, a heat exchanger 2 is provided inside the housing cavity 1c. The heat exchanger 2 is used to exchange heat with the airflow flowing through the air inlet 1a of the housing. When the air conditioner is cooling, the low-temperature refrigerant flowing inside the heat exchanger 2 absorbs heat from the airflow, thus cooling the air. When heating, the high-temperature refrigerant releases heat to the airflow, thus warming the air. The heat exchanger 2 typically adopts a finned structure to increase the contact area with the airflow, improve heat exchange efficiency, and ensure that the air entering the room reaches the set temperature.

[0056] In some embodiments, a cross-flow fan 3 is provided inside the housing cavity 1c. The cross-flow fan 3 is used to introduce airflow into the housing 1 through the housing air inlet 1a, and after heat exchange in the heat exchanger 2, it is delivered to the room through the housing air outlet 1b. During operation, the cross-flow fan 3 generates negative pressure by rotating, drawing indoor air in from the housing air inlet 1a. After heat exchange in the heat exchanger 2, the processed air is then delivered into the room through the housing air outlet 1b by the thrust of the fan, completing the circulation and renewal of indoor air. The cross-flow fan 3 includes a fan end cover 31 and a fan shaft 312, which are disposed at one end of the cross-flow fan 3 along its own axial direction. The fan shaft 312 is disposed on the fan end cover 31.

[0057] In some embodiments, combined with Figure 5 , Figure 8 and Figure 9 , Figure 8 This is a schematic diagram of the inner stator 42 disclosed in the embodiments of this application from a second perspective. Figure 9 for Figure 8The cross-sectional view at point CC shows a drive motor 4 housed within the housing cavity 1c. The drive motor 4 includes an outer rotor 41 and an inner rotor. The outer rotor 41 is connected to the end of the cross-flow fan 3, and the inner stator 42 is located inside the outer rotor 41. The inner rotor is the core component generating the rotating magnetic field, and the outer rotor 41 rotates with the rotating magnetic field, driving the fan to rotate synchronously. The outer rotor 41 motor can output greater torque, meeting the low-speed, high-flow air delivery requirements of the cross-flow fan 3. The inner stator 42 has a shaft hole 421a.

[0058] In some embodiments, the air conditioner indoor unit 100 further includes a bearing 5 disposed in a shaft hole 421a, and the fan shaft 312 passes through the bearing 5 along the axial direction of the cross-flow fan 3.

[0059] In some embodiments, combined with Figure 5 , Figure 7 , Figure 8 and Figure 10 , Figure 7 This is a schematic diagram of the inner stator 42 disclosed in the embodiment of this application from a first-view perspective. The inner stator 42 is also provided with heat dissipation holes 4211. The heat dissipation holes 4211 penetrate the inner stator 42 along the axial direction of the drive motor 4. The cross-flow fan 3 also includes a plurality of heat dissipation blades 311, which are disposed on the side of the fan end cover 31 facing the drive motor 4 and are arranged at intervals along the circumference of the fan shaft 312. When the cross-flow fan 3 rotates, it can drive the plurality of heat dissipation blades 311 to rotate, so that heat dissipation airflow is formed in the heat dissipation holes 4211.

[0060] Bearing 5 is the core moving component of drive motor 4. During the rotation of cross-flow fan 3, there is continuous friction between bearing 5 and fan shaft 312, which generates a large amount of heat. If heat accumulates, it may cause the bearing 5 to overheat, leading to lubrication failure, accelerated wear, or even jamming, directly affecting the lifespan of drive motor 4 and the operational stability of air conditioner. When the heat dissipation blades 311 rotate with cross-flow fan 3, they can form a directional airflow (cooling airflow) within the heat dissipation holes 4211. This airflow can directly flow through the area near bearing 5, efficiently carrying away the heat generated by bearing 5.

[0061] A heat dissipation blade 311 is added to the fan end cover 31 of the cross-flow fan 3. The rotational power of the cross-flow fan 3 driven by the drive motor 4 directly drives the heat dissipation blade 311 to rotate. At the same time, a heat dissipation hole 4211 is set through the inner stator 42. Under the action of the heat dissipation blade 311, a heat dissipation airflow is generated in the heat dissipation hole 4211. Heat dissipation of the bearing 5 can be achieved without the need for an additional motor or fan. By continuously removing heat from the bearing 5 through the heat dissipation airflow, the operating temperature of the bearing 5 can be effectively controlled, avoiding problems such as material performance degradation (such as reduced hardness of bearing 5 steel) and accelerated aging of grease caused by high temperature. This ensures the long-term stable operation of the drive motor 4, reduces the probability of air conditioner maintenance due to motor failure, and improves the overall reliability and durability of the equipment.

[0062] The design of the heat dissipation blades 311 and heat dissipation holes 4211 does not occupy the space of the indoor unit 100 of the air conditioner. The overall structure is simple, which reduces the manufacturing cost and assembly complexity of the equipment, avoids the increase in energy consumption caused by an additional power source, and achieves good heat dissipation for the bearing 5.

[0063] In some embodiments, the fan end cover 31 is provided with a plurality of ventilation holes, each ventilation hole being disposed on two adjacent heat dissipation blades 311, and the ventilation holes communicating with the heat dissipation holes 4211 so that the heat dissipation airflow flows through the ventilation holes along the axial direction of the fan end cover 31.

[0064] Ventilation holes are located between adjacent heat dissipation blades 311. These blades, acting as blades of an axial fan, generate axial driving force when rotated, propelling airflow towards or away from the drive motor 4. Thus, multiple heat dissipation blades 311 constitute an axial fan. The axial fan propels airflow axially (i.e., along the rotation axis of the cross-flow fan 3), and the shape and arrangement of the heat dissipation blades 311 determine the intensity and direction of the axial airflow.

[0065] The ventilation holes are connected to the heat dissipation holes 4211. The rotation of the heat dissipation blades 311 generates axial airflow. The airflow passes through the ventilation holes, through the fan end cover 31, and enters the heat dissipation holes 4211 or the interior of the cross-flow fan 3. This straight axial through path reduces the resistance and loss of airflow during transmission, allowing the heat dissipation airflow to act more smoothly and directly on the heat-generating areas of the bearing 5 and the inner stator 42, thereby improving heat dissipation efficiency.

[0066] In some embodiments, combined with Figure 10 The heat dissipation blades 311 are arc-shaped strips and protrude from the side of the fan end cover 31 facing the drive motor 4.

[0067] When the blades rotate, the arc-shaped blades can drive the air near the axis and guide it radially outward along the arc tangent direction through centrifugal force. In this way, multiple heat dissipation blades 311 form a centrifugal fan. The airflow enters from the heat dissipation hole 4211 axially and flows out radially, or the airflow is drawn in radially by the blades and then enters the heat dissipation hole 4211 axially, thereby achieving good heat dissipation for the bearing 5.

[0068] Centrifugal fans require blades with a certain axial height (i.e., protrusion thickness) to effectively capture air in the gap between the fan end cover 31 and the drive motor 4, forming a stable airflow channel. The arc-shaped profile makes the airflow along the blade surface smooth, reducing turbulence that may be generated by straight blades, reducing airflow resistance and vortex noise. The strip-shaped structure (i.e., the length of the blade extending radially is adapted to the radial airflow path of the centrifugal fan) ensures that the airflow delivery path from the axis to the radial outer side is continuous, avoiding local airflow congestion caused by irregular blade shape, further reducing energy loss, allowing more power to be used to drive the cooling airflow, and ensuring cooling efficiency.

[0069] In some embodiments, along the axial direction of the cross-flow fan 3, the distance between the side of the heat dissipation blade 311 facing away from the fan end cover 31 and the side of the inner stator 42 facing the fan end cover 31 is 3mm to 5mm.

[0070] If the distance between the side of the heat dissipation blade 311 facing away from the fan end cover 31 and the side of the inner stator 42 facing the fan end cover 31 is less than 3mm, the cross-flow fan 3 will generate a certain vibration during the high-speed rotation of the air conditioner indoor unit 100. If the gap between the heat dissipation blade 311 and the inner stator 42 is too small, it is very easy for the two to collide or rub due to vibration, causing wear or even jamming of the parts, which seriously affects the normal operation and service life of the equipment and cannot guarantee the stable operation of the drive motor 4 and the cross-flow fan 3.

[0071] If the distance is greater than 5mm, the gap between the heat dissipation blade 311 and the inner stator 42 will be too large, which will occupy additional space in the housing cavity 1c, which is not conducive to the miniaturization and integration of the equipment.

[0072] When this distance is between 3mm and 5mm, it effectively avoids interference between the heat dissipation fins 311 and the inner stator 42 due to vibration, ensuring a safe distance between them during operation and guaranteeing stable equipment operation. It also allows the cooling airflow generated by the rotation of the heat dissipation fins 311 to enter the heat dissipation holes 4211 of the inner stator 42 with high efficiency, reducing airflow diffusion and loss, and improving heat dissipation. At the same time, this gap range does not excessively occupy the space of the housing cavity 1c, balancing equipment safety, heat dissipation efficiency, and structural compactness, achieving an optimized balance of multiple performance aspects.

[0073] In some embodiments, combined with Figure 10 The fan end cover 31 has a limiting rib 313 on the side facing the drive motor 4. The limiting rib 313 is annular, and the center of the limiting rib 313 is located on the axis of the fan shaft 312. The inner stator 42 is disposed inside the limiting rib 313. The limiting rib 313 is configured to limit the position of the drive motor 4 relative to the cross-flow fan 3. The heat dissipation blades 311 are disposed between the fan shaft 312 and the limiting rib 313.

[0074] The limiting rib 313 radially restricts the position of the inner stator 42 of the drive motor 4. During the assembly of the indoor unit 100 of the air conditioner, the limiting rib 313 serves as a positioning reference to ensure the coaxiality of the drive motor 4 and the cross-flow fan 3, preventing misalignment of their axes due to assembly deviations. When the cross-flow fan 3 rotates at high speed, coaxial positioning reduces the relative wobble between the drive motor 4 and the fan end cover 31, lowers vibration and noise caused by eccentric rotation, and avoids abnormal friction between components caused by positional misalignment, ensuring long-term stable operation of the equipment.

[0075] The heat dissipation blades 311 are disposed between the fan shaft 312 and the limiting rib 313. The annular structure of the limiting rib 313 is equivalent to defining a clear radial boundary for the heat dissipation blades 311. This installation area makes the distribution of the heat dissipation blades 311 more concentrated in the core area close to the fan shaft 312, which matches the working characteristics of the centrifugal fan "drawing air from the shaft and sending air outward", further improving the airflow drive efficiency.

[0076] In addition, the annular limiting rib 313 protrudes from the surface of the fan end cover 31. Its own structure can provide certain support and reinforcement for the fan end cover 31, improve the deformation resistance of the fan end cover 31 when rotating at high speed, and reduce structural losses caused by vibration.

[0077] Optionally, the outer rotor 41 is injection molded onto the outer periphery of the limiting rib 313 on the fan end cover 31 to ensure a more stable connection between the outer rotor 41 and the fan.

[0078] In some embodiments, combined with Figure 5 Multiple heat dissipation blades 311 together form an air inlet cavity 311a, which is connected to the heat dissipation hole 4211 and is opposite to the drive motor 4 along the axial direction.

[0079] When the heat dissipation blades 311 rotate with the cross-flow fan 3, the air inlet cavity 311a and the heat dissipation hole 4211 are axially opposite to each other along the drive motor 4, forming a shorter airflow channel between the heat dissipation blades 311 and the heat dissipation hole 4211. The airflow generated by the rotation of the heat dissipation blades 311 converges within the air inlet cavity 311a and can then flow directly axially towards the heat dissipation hole 4211. Alternatively, the rotation of the heat dissipation blades 311 can directly drive the airflow within the heat dissipation hole 4211 towards the air inlet cavity 311a and then flow radially out. This reduces path loss and turbulence interference during airflow transmission. This axially opposite structure allows the cooling airflow to enter and exit the heat dissipation hole 4211 more smoothly, ensuring that the airflow energy is concentrated on the heat-generating component (bearing 5) and improving the efficiency of heat exchange.

[0080] In some embodiments, combined with Figures 3 to 6 , Figure 6The exploded view of the drive motor 4 disclosed in this application embodiment shows that the air conditioner indoor unit 100 also includes a base 6, which is disposed in the housing cavity 1c. A heat exchange air duct is formed in the base 6, and the cross-flow fan 3 is disposed in the heat exchange air duct. The drive motor 4 also includes a motor housing 43 and a motor end cover 44. The motor housing 43 covers the inner stator 42 and the outer rotor 41 and is connected to the base 6. A first gap 43a is formed between the motor housing 43 and the fan end cover 31, and the air inlet cavity 311a is connected to the housing cavity 1c through the first gap 43a. The motor end cover 44 is disposed at the end of the motor housing 43 away from the cross-flow fan 3, and a second gap 44a is formed between the motor end cover 44 and the motor housing 43. The heat dissipation hole 4211 is connected to the housing cavity 1c through the second gap 44a. The housing cavity 1c, the first gap 43a, the air inlet cavity 311a and the second gap 44a together form a heat dissipation channel so that when the cross-flow fan 3 rotates, a heat dissipation airflow is formed in the heat dissipation channel.

[0081] Thus, when the cross-flow fan 3 rotates, the air in the housing cavity 1c enters the motor housing 43 through the second gap 44a, and then flows into the air inlet cavity 311a after exchanging heat with the bearing 5 through the heat dissipation hole 4211. After that, it flows out of the motor housing 43 radially through the first gap 43a. Alternatively, the air in the housing cavity 1c enters the motor housing 43 through the first gap 43a, and then flows into the heat dissipation hole 4211 axially through the air inlet cavity 311a after exchanging heat with the bearing 5. After that, it flows out of the motor housing 43 through the second gap 44a.

[0082] The cooling airflow flows orderly along the cooling channel. This closed-loop airflow circulation avoids disorderly diffusion of the cooling airflow and ensures that the airflow can continuously flow through the cooling holes 4211 of the drive motor 4 to dissipate heat from the bearing 5, greatly improving the continuity and stability of heat dissipation. This design based on the existing structure makes the heat dissipation structure (cooling holes 4211, cooling blades 311) more coordinated with the overall layout of the air conditioner indoor unit 100, without occupying a large amount of extra space.

[0083] In some embodiments, combined with Figure 9The inner stator 42 includes a stator encapsulation 421, a stator core 422, and a stator winding 423. The stator encapsulation 421 uses insulating material (such as plastic) to encapsulate the stator core 422 and the winding, providing insulation, fixation, and protection, while also isolating the internal electromagnetic components from external heat transfer and electromagnetic interference. The stator encapsulation 421 has a shaft hole 421a and multiple mounting cavities 421b inside. The shaft hole 421a provides a mounting position for the bearing 5, ensuring the coaxiality of the fan shaft 312 and the motor. The multiple mounting cavities 421b are arranged circumferentially around the shaft hole 421a and radially spaced from it. The stator core 422, located in the mounting cavity 421b, is typically made of laminated silicon steel sheets. As the core of the magnetic circuit, it enhances the magnetic field strength generated by the winding and reduces magnetic losses.

[0084] The stator encapsulation 421 has a shaft hole 421a and multiple mounting cavities 421b inside. The multiple mounting cavities 421b are arranged around the shaft hole 421a circumferentially and are radially separated from the shaft hole 421a. The stator core 422 is disposed in the mounting cavity 421b. The stator winding 423 is wound around the stator core 422. Along the radial direction of the shaft hole 421a, a heat dissipation hole 4211 is located between the shaft hole 421a and the mounting cavity 421b. The heat dissipation hole 4211 penetrates the stator encapsulation 421 along the axial direction of the shaft hole 421a.

[0085] The heat dissipation hole 4211 is located between the shaft hole 421a and the mounting cavity 421b. On the one hand, the heat around the bearing 5 can be more easily discharged radially through the stator plastic seal 421 to the heat dissipation, reducing the temperature around the bearing 5. On the other hand, it can also accelerate the heat exchange between the stator core 422 and the outside world, indirectly reducing the thermal impact on the bearing 5, and ultimately alleviating the high temperature problem of the bearing 5, improving the motor power output capacity and service life.

[0086] In some embodiments, combined with Figure 7 and Figure 8 The heat dissipation holes 4211 include multiple holes, which are arranged circumferentially around the shaft hole 421a.

[0087] Multiple heat dissipation holes 4211 are distributed circumferentially along the shaft hole 421a, which can form an annular heat dissipation zone between the shaft hole 421a of the stator plastic seal 421 and the mounting cavity 421b, preventing the heat of the bearing 5 from accumulating in a certain area. The frictional heat generated by the sliding part 52 of the bearing 5 can also be quickly discharged through the surrounding heat dissipation holes 4211, making the temperature distribution around the shaft hole 421a more uniform.

[0088] In some embodiments, the heat dissipation hole 4211 has a fan-shaped cross section along the axial direction perpendicular to the shaft hole 421a. The fan shape includes a first arc-shaped side and a second arc-shaped side arranged radially opposite to each other along the drive motor 4. The second arc-shaped side is located on the side of the first arc-shaped side away from the shaft hole 421a, and the length of the second arc-shaped side is greater than the length of the second arc-shaped side.

[0089] The fan-shaped cross-section radiates outwards from the shaft hole 421a, with its two sides extending radially and its arc-shaped edges arranged radially. This structure allows for more efficient use of the limited radial and circumferential dimensions within the annular space between the shaft hole 421a and the mounting cavity 421b. Compared to circular or square cross-sections, the fan-shaped cross-section has a larger area, accelerating heat conduction to the air within the heat dissipation holes 4211 and improving convective heat dissipation efficiency. Furthermore, the straight sides of adjacent fan-shaped heat dissipation holes 4211 can be closely arranged, avoiding the waste of gaps that occur when circular holes are arranged circumferentially. More heat dissipation holes 4211 can be arranged within the same circumferential space, or the effective heat dissipation area of ​​a single heat dissipation hole 4211 can be increased.

[0090] In some embodiments, bearing 5 is a rubber sliding bearing 5.

[0091] Rubber has high elasticity and damping properties. When the fan shaft 312 rotates in the sliding member 52, the rubber can absorb vibration energy through its own deformation, avoiding friction or impact noise generated by the rigid contact between the metal bearing 5 and the shaft.

[0092] The rubber surface has a low coefficient of friction and good stability. When used with grease, it can reduce frictional vibration when the fan shaft 312 rotates, avoiding high-frequency noise caused by uneven friction. At the same time, the elasticity of the rubber can compensate for the slight coaxiality deviation between the fan shaft 312 and the bushing 51, reducing frictional noise caused by eccentric rotation and making the air conditioner operate more quietly.

[0093] In some embodiments, combined with Figure 6 The drive motor 4 also includes a shock absorber 45, which is disposed on the side of the inner stator 42 near the motor end cover 44 and between the inner stator 42 and the motor housing 43.

[0094] When the motor is running, the inner stator 42 will vibrate periodically due to electromagnetic force, and the motor housing 43 will transmit the vibration. The damping component 45 (usually an elastic material such as rubber or silicone) is located between the inner stator 42 and the housing. It can absorb the vibration energy of the inner stator 42 through its own deformation, avoid the vibration from being directly transmitted to the housing through rigid contact, and reduce the noise generated by the resonance of the housing.

[0095] It should be noted that the end of the cross-flow fan 3 away from the drive motor 4 is also provided with a fan shaft 312, which is rotatably connected to the base 6 of the air conditioner indoor unit 100 through a bearing 5.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An indoor unit for an air conditioner, characterized in that, include: The housing has an air inlet and an air outlet, and a housing cavity is formed inside the housing. The housing cavity contains: A heat exchanger for exchanging heat with the airflow passing through the air inlet of the housing; A cross-flow fan, wherein the cross-flow fan is used to introduce airflow into the housing through the air inlet of the housing, and after heat exchange by the heat exchanger, the airflow is delivered to the room through the air outlet of the housing, the cross-flow fan comprising: A fan end cap is disposed at one end of the cross-flow fan along its own axial direction; The fan shaft is located on the fan end cover; A drive motor, used to drive the cross-flow fan to rotate, the drive motor comprising: The outer rotor is connected to the fan end cover; An inner stator is disposed inside the outer rotor, and the inner stator is provided with a shaft hole; A bearing is disposed in the shaft hole, and the fan shaft passes through the bearing along the axial direction of the cross-flow fan; The inner stator is further provided with: The heat dissipation holes extend through the inner stator along the axial direction of the drive motor and are spaced apart from the shaft holes; The cross-flow fan also includes: Multiple heat dissipation blades are disposed on the side of the fan end cover facing the drive motor and are arranged at circumferential intervals along the fan shaft. When the cross-flow fan rotates, it can drive the multiple heat dissipation blades to rotate, so that heat dissipation airflow is formed in the heat dissipation holes.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The fan end cover is provided with a plurality of ventilation holes, each ventilation hole being located between two adjacent heat dissipation blades. The ventilation holes are connected to the heat dissipation holes so that the heat dissipation airflow flows through the ventilation holes along the axial direction of the fan end cover.

3. The indoor unit of the air conditioner according to claim 1, characterized in that, The heat dissipation blades are arc-shaped strips and protrude from the side of the fan end cover facing the drive motor.

4. The indoor unit of the air conditioner according to claim 3, characterized in that, Along the axial direction of the cross-flow fan, the distance between the side of the heat dissipation blade facing away from the fan end cover and the side of the inner stator facing the fan end cover is 3mm to 5mm.

5. The indoor unit of the air conditioner according to claim 3, characterized in that, The side of the fan end cover facing the drive motor is provided with: The limiting rib is annular, and the center of the limiting rib is located on the axis of the fan shaft. The inner stator is disposed inside the limiting rib, and the limiting rib is configured to limit the position of the drive motor relative to the cross-flow fan. The heat dissipation blades are disposed between the fan shaft and the limiting rib.

6. The indoor unit of the air conditioner according to any one of claims 3-5, characterized in that, Multiple heat dissipation blades together form an air inlet cavity, which is connected to the heat dissipation hole and is opposite to it along the axial direction of the drive motor.

7. The indoor unit of the air conditioner according to claim 6, characterized in that, The indoor unit of the air conditioner also includes: A base is disposed within the housing cavity, and a heat exchange air duct is formed within the base. The cross-flow fan is disposed within the heat exchange air duct. The drive motor also includes: The motor housing covers the inner stator and the outer rotor and is connected to the base. A first gap is formed between the motor housing and the fan end cover. The air inlet cavity is connected to the housing cavity through the first gap. A motor end cover is disposed at the end of the motor housing away from the cross-flow fan. A second gap is formed between the motor end cover and the motor housing. The heat dissipation hole is connected to the housing cavity through the second gap. The housing cavity, the first gap, the air inlet cavity, and the second gap together form a heat dissipation channel, so that when the cross-flow fan rotates, the heat dissipation airflow is formed in the heat dissipation channel.

8. The indoor unit of the air conditioner according to claim 1, characterized in that, The inner stator includes: Stator encapsulation, wherein the interior of the stator encapsulation contains: Shaft hole; Multiple mounting cavities are arranged around the shaft hole circumferentially and radially spaced from the shaft hole; The stator core is disposed in the mounting cavity; Stator windings are wound around the stator core; Along the radial direction of the shaft hole, the heat dissipation hole is located between the shaft hole and the mounting cavity, and the heat dissipation hole penetrates the stator encapsulation along the axial direction of the shaft hole.

9. The indoor unit of the air conditioner according to claim 8, characterized in that, The heat dissipation holes include multiple holes, which are circumferentially spaced around the shaft hole.

10. The indoor unit of the air conditioner according to claim 9, characterized in that, The heat dissipation hole has a fan-shaped cross-section along the axial direction perpendicular to the shaft hole.

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