Indoor unit of a wall-mounted air conditioner

Abstract

This application discloses a wall-mounted air conditioner indoor unit, belonging to the field of air treatment technology. It includes: a cross-flow fan, comprising: an end cover; a shaft fixed to the end cover; an annular portion surrounding the shaft and extending outward from the end cover along the shaft's axial direction; a bearing assembly including a bearing housing, the bearing housing comprising: a first reinforcing portion; a second reinforcing portion sleeved outside the first reinforcing portion and spaced apart from the first reinforcing portion to form a first annular cavity, the first annular cavity having a first opening at one end near the end cover; a connecting plate parallel to the end cover, its two ends respectively connecting to the first reinforcing portion and the second reinforcing portion and sealing the other end of the first annular cavity; the end of the annular portion extending into the first annular cavity from the first opening. The air duct side of this wall-mounted air conditioner indoor unit utilizes the end cover, the annular portion, and the bearing housing to form a labyrinthine structure, preventing impurities from adhering to the bearing assembly and the shaft of the cross-flow fan, without reducing the movement clearance between the cross-flow fan and the bearing assembly, thus preventing noise generated by friction.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a wall-mounted air conditioning indoor unit. Background Technology

[0002] The fan-motor system of a wall-mounted air conditioner indoor unit typically consists of a drive motor, a fan, and a support bearing. The bearing, fan, and motor are mounted on a base. One side of the fan is connected to the motor, while the other side is supported by the bearing. The fan operates under the support of the motor and bearing. Generally, sliding bearings are used, directly mounted on the base. The fan's metal shaft is inserted into the bearing balls, and the bearing opening is usually exposed in the air duct.

[0003] However, due to the diverse installation and use environments of air conditioners, the bearings contain lubricating oil and the openings are exposed for a long time. Impurities such as cotton wool and dust in the environment will stick to the metal shaft and bearings. When the air conditioner is running, it will generate friction noise, which will affect users' work, study and rest, resulting in a poor user experience or user complaints.

[0004] Existing solutions to the above problems include reducing the distance between the rubber bearing and the fan side cover to decrease the probability of dust and impurities adhering. However, when using this approach, the fan / base undergoes significant dimensional changes due to thermal expansion and contraction, or assembly issues cause friction between the fan and rubber during operation, thus failing to fundamentally solve the problem. Summary of the Invention

[0005] This application provides a wall-mounted air conditioner indoor unit, in which an end cover, a circular part, and a bearing seat are used to form a labyrinth structure on one side of the air duct to prevent impurities from adhering to the bearing assembly and the shaft of the cross-flow fan, without reducing the movement clearance between the cross-flow fan and the bearing assembly, thus preventing noise generated by friction.

[0006] This application provides a wall-mounted air conditioner indoor unit, including: a housing, with an air inlet and an air outlet respectively provided on the top and bottom front side of the housing, and the housing includes a base;

[0007] A cross-flow fan is mounted on a base. Under the action of the cross-flow fan, indoor airflow enters the housing through the air conditioner inlet and is then output to the room through the air conditioner outlet. The cross-flow fan includes: an end cover; a shaft fixed to the end cover; and an annular portion that surrounds the shaft and extends outward from the end cover along the axial direction of the shaft.

[0008] A bearing assembly is mounted on a base. The shaft of the cross-flow fan is inserted into the bearing assembly. The bearing assembly includes a bearing housing, which includes: a first reinforcing part; a second reinforcing part, which is sleeved outside the first reinforcing part and spaced apart from the first reinforcing part to form a first annular cavity. The first annular cavity has a first opening at one end near the end cover; a connecting plate, which is parallel to the end cover and has its two ends connected to the first reinforcing part and the second reinforcing part respectively, and closes the other end of the first annular cavity; and the end of the annular part extends into the first annular cavity from the first opening.

[0009] This wall-mounted air conditioner indoor unit utilizes an end cover, a circular section, and a bearing housing to form a labyrinthine structure on one side of the air duct, preventing impurities from adhering to the bearings without reducing the movement clearance between the cross-flow fan and the bearings. This ensures a sealing and dustproof effect on the bearings while avoiding large dimensional changes due to thermal expansion and contraction of the fan / base, or problems such as fan friction against the bearings due to assembly issues.

[0010] In some embodiments, the distance from the end of the annular portion to the end cover in the axial direction of the shaft is L2, and the minimum clearance from the bearing assembly to the end cover is L1, where L2 > L1, to ensure the protective effect.

[0011] In some embodiments, the distance from the end of the annular portion to the connecting plate in the axial direction of the shaft is L3, where L3 > L1, to prevent the fan from surging during a fall and causing abnormal noise due to impact damage to the weak structure.

[0012] In some embodiments, L2 = L1 + 3mm to further ensure the protective effect.

[0013] In some embodiments, 3mm < L1 ≤ 10mm, wherein L1 > 3mm, to prevent friction on the bearing during fan operation due to part tolerance, part deformation, assembly offset, thermal expansion and contraction deformation, etc.; L1 ≤ 10mm, to prevent waste of overall machine size, and at the same time, impurities are more likely to adhere to the bearing / shaft.

[0014] In some embodiments, the minimum clearance from the bearing assembly to the annular portion in the radial direction of the shaft is L4, where 2mm < L4 ≤ 3mm. If the clearance is too small, the bearing may rub against the fan during operation due to deformation of the components, or damage may occur due to impacts from drops, causing the weak structures to collide with each other. If the clearance is too large, the protective effect will be weakened.

[0015] In some embodiments, the bearing assembly further includes a bushing fitted within the bearing housing. The bushing includes: a buffer portion fitted within the first reinforcing portion; and a bearing ball fitted between the buffer portion and the shaft, and rotatably connected to the shaft. The buffer portion is generally made of rubber to improve the buffering effect.

[0016] In some embodiments, the first reinforcing portion includes: a first annular plate sleeved outside the buffer portion; and a second annular plate sleeved outside the first annular plate, spaced apart from the first annular plate to form a second annular cavity.

[0017] In some embodiments, the first reinforcing part further includes a plurality of partitions disposed between the first annular plate and the second annular plate, the plurality of partitions dividing the second annular cavity into a plurality of fan-shaped cavities, thereby further improving the buffering and reinforcing effect.

[0018] Another aspect of this application provides a wall-mounted air conditioner indoor unit, including: a housing, with an air inlet and an air outlet respectively provided on the top and bottom front side of the housing, and the housing includes a base;

[0019] A cross-flow fan is mounted on a base. Under the action of the cross-flow fan, indoor airflow enters the housing through the air conditioner inlet and is then output to the room through the air conditioner outlet. The cross-flow fan includes: an end cover; a shaft fixed to the end cover; and an annular portion surrounding the shaft and extending outward from the end cover along the axial direction of the shaft to form a receiving cavity with a second opening.

[0020] A bearing assembly is mounted on a base. The bearing assembly includes a bushing fitted over the shaft to support a cross-flow fan, and a bearing housing fitted over the bushing. The bearing housing includes: a first reinforcing part; a second reinforcing part fitted over the first reinforcing part and spaced apart from the first reinforcing part to form a first annular cavity, the first annular cavity having a first opening at one end near the end cover; a connecting plate, parallel to the end cover, with its two ends connected to the first reinforcing part and the second reinforcing part respectively and closing the other end of the first annular cavity; the end of the annular part extends into the first annular cavity from the first opening, and one end of the bushing extends into the receiving cavity from the second opening. Attached Figure Description

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the indoor unit of the air conditioner of this application is shown;

[0022] Figure 2 This invention illustrates a schematic diagram of the structure of an air conditioner indoor unit in one embodiment where the air guide plate opens the air outlet.

[0023] Figure 3 A front view of an embodiment of the indoor unit of the air conditioner of this application is shown;

[0024] Figure 4 It shows Figure 3 A cross-sectional view along the AA direction;

[0025] Figure 5 A cross-sectional view of one embodiment of the indoor unit of the air conditioner of this application is shown;

[0026] Figure 6 A schematic diagram of the cross-flow fan structure is shown in one embodiment of the indoor unit of the air conditioner according to this application;

[0027] Figure 7 This paper shows another structural schematic diagram of the cross-flow fan in one embodiment of the indoor unit of the air conditioner according to the present application;

[0028] Figure 8 A schematic diagram of the bearing assembly in one embodiment of the indoor unit of the air conditioner of this application is shown;

[0029] Figure 9 This invention illustrates another structural schematic diagram of the bearing assembly in one embodiment of the air conditioner indoor unit of this application;

[0030] Figure 10 It shows Figure 5 Enlarged view of a portion at point A;

[0031] Figure 11 It shows Figure 9 Cross-sectional view along the BB direction;

[0032] Figure 12 A partial schematic diagram of one embodiment of the indoor unit of the air conditioner of this application is shown;

[0033] In the above figures: 1. Shell; 11. Base; 12. Air conditioning inlet; 13. Air conditioning outlet; 14. Air guide plate; 15. Air inlet grille; 2. Indoor heat exchanger; 3. Cross-flow fan; 31. End cover; 32. Shaft; 33. Circular part; 4. Bearing seat; 41. First reinforcing part; 411. First annular plate; 412. Second annular plate; 413. Partition plate; 42. Second reinforcing part; 43. Connecting plate; 5. Bushing; 51. Buffer part; 52. Bearing ball. Detailed Implementation

[0034] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0035] 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.

[0036] 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. Therefore, 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.

[0037] 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.

[0038] Air conditioners execute a refrigeration cycle using a compressor, condenser, expansion valve, and evaporator. The refrigeration cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0039] The compressor compresses refrigerant gas at a low temperature and low pressure and discharges the compressed refrigerant gas. The discharged refrigerant gas flows into the condenser. The condenser condenses the compressed refrigerant into a liquid phase, and heat is released to the surrounding environment through the condensation process.

[0040] The expansion valve expands the high-temperature, high-pressure liquid refrigerant condensed in the condenser into a low-pressure liquid refrigerant. The evaporator evaporates the expanded refrigerant in the expansion valve, returning the low-temperature, low-pressure refrigerant gas to the compressor. The evaporator achieves its cooling effect by utilizing the latent heat of refrigerant evaporation to exchange heat with the material being cooled. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0041] The outdoor unit of an air conditioner refers to the refrigeration cycle, which includes the compressor and the outdoor heat exchanger. The indoor unit of an air conditioner includes the indoor heat exchanger, and the expansion valve can be provided in either the indoor or outdoor unit.

[0042] An outdoor unit for an air conditioner may include an outdoor casing. An outdoor heat exchange duct may be installed inside the outdoor casing.

[0043] The outdoor casing may include an outdoor air inlet. The outdoor air inlet may be connected to an outdoor heat exchange duct. The outdoor air inlet is used to introduce outdoor air into the outdoor heat exchange duct.

[0044] The outdoor casing may include an outdoor air outlet. The outdoor air outlet may connect to an outdoor heat exchange duct. The outdoor air outlet may be used to exhaust air from inside the outdoor heat exchange duct to the outside of the outdoor heat exchange duct.

[0045] An outdoor unit of an air conditioner may include an outdoor heat exchanger. The outdoor heat exchanger may be located inside an outdoor heat exchange duct.

[0046] An outdoor unit for an air conditioner may include an outdoor fan. The outdoor fan may be installed inside an outdoor heat exchange duct.

[0047] The rotation of the outdoor fan causes outdoor air to enter the heat exchange duct through the outdoor air inlet and exchange heat with the outdoor heat exchanger. After heat exchange, the outdoor air flows out of the outdoor heat exchange duct through the outdoor air outlet.

[0048] An air conditioner may include a compressor. The compressor is located inside the outdoor heat exchange duct.

[0049] Air conditioners may include a throttling device. The throttling device is used to limit airflow. The throttling device can be provided in either the indoor or outdoor unit of the air conditioner.

[0050] Air conditioners execute a refrigeration cycle using a compressor, condenser, throttling device, and evaporator. The refrigeration cycle involves a series of processes including compression, condensation, expansion, and evaporation, supplying refrigerant to the conditioned and heat-exchanged air.

[0051] The compressor compresses the refrigerant gas at low temperature and low pressure and discharges it at high temperature and high pressure. The discharged refrigerant gas flows into the condenser.

[0052] The condenser condenses the compressed refrigerant into a liquid phase, and the heat is released to the surrounding environment through the condensation process.

[0053] The throttling device causes the high-temperature, high-pressure liquid refrigerant condensed in the condenser to expand into a low-pressure liquid refrigerant.

[0054] The evaporator evaporates the refrigerant that expands in the throttling device and returns the refrigerant gas, which is in a low-temperature and low-pressure state, to the compressor.

[0055] An evaporator achieves a cooling effect by exchanging heat with the material being cooled using the latent heat of refrigerant evaporation. Throughout the cycle, the air conditioner regulates the temperature of the indoor space.

[0056] In the indoor heat exchanger and the outdoor heat exchanger, one is a condenser and the other is an evaporator. When the indoor heat exchanger is used as a condenser, the air conditioner is used as a heater in heating mode. When the indoor heat exchanger is used as an evaporator, the air conditioner is used as a cooler in cooling mode.

[0057] The wall-mounted air conditioner indoor unit provided by this utility model can have various implementation forms.

[0058] in, Figures 1-12 This is an illustrative embodiment of the wall-mounted air conditioner indoor unit of this utility model. The wall-mounted air conditioner indoor unit is installed indoors and is used for heat exchange with the indoor environment.

[0059] refer to Figure 1-3In this embodiment, the wall-mounted air conditioner indoor unit includes a housing 1. The housing 1 is installed indoors and forms the overall appearance of the air conditioner indoor unit.

[0060] Continue to refer to Figure 1 The housing 1 is generally rectangular in shape. The housing 1 has a top end and a bottom end, which are opposite to each other in the height direction. The left side and right side of the housing 1 are opposite to each other in the length direction, and the front side and rear side of the housing 1 are opposite to each other in the thickness direction.

[0061] The housing 1 is located at the top of the room or in the upper space of the room. The front side of the housing 1 faces the user and the rear side of the housing 1 faces the wall, making it suitable for connection with the wall.

[0062] It should be noted that the directions described in the text are based on the direction the user faces when facing the indoor unit of the air conditioner. Specifically, the side of the indoor unit facing the user when using the wall-mounted air conditioner is defined as the front side, and the opposite side is defined as the rear side. The left and right sides are distinguished by the direction the user faces when facing the indoor unit of the wall-mounted air conditioner.

[0063] A heat exchange air duct is formed inside the housing 1. The heat exchange air duct is used to house and fix various components in the indoor unit of the air conditioner, which can prevent external objects from colliding with the various components inside the housing 1, thereby improving the stability and reliability of the indoor unit of the air conditioner during transportation or installation.

[0064] In some embodiments of this application, reference is made to Figure 2 The housing 1 may include an air conditioning inlet 12. The air conditioning inlet 12 is connected to the heat exchange duct and serves as an inlet for external air to flow into the housing 1. The air conditioning inlet 12 allows indoor air to enter the heat exchange duct through the air conditioning inlet 12.

[0065] In some embodiments of this application, reference is made to Figure 2 The housing 1 may include an air conditioning outlet 13. The air conditioning outlet 13 is connected to the heat exchange duct and serves as the outlet for the heat exchange airflow inside the housing 1. The air conditioning outlet 13 allows the airflow inside the heat exchange duct to flow out through the air conditioning outlet 13.

[0066] The air inlet 12 can be located at the top of the housing 1. The air outlet 13 can be located at the front side of the housing 1 and near the bottom of the housing 1, that is, the air outlet 13 is located at the bottom front side of the housing 1. In this embodiment, when the indoor unit of the wall-mounted air conditioner is working, the indoor unit takes in air from the top and exits air towards the front.

[0067] The air conditioner outlet 13 can be elongated and can extend along the length of the housing 1, which improves the aesthetics of the indoor unit.

[0068] Continue to refer to Figure 2 In some embodiments of this application, the indoor unit of the air conditioner may include an air guide plate 14.

[0069] The air guide plate 14 is rotatably connected to the housing 1 and is located at the air conditioner outlet 13. The air guide plate 14 opens or closes the air conditioner outlet 13. When the air guide plate 14 opens the air conditioner outlet 13, it is used to guide the heat exchange airflow.

[0070] In some embodiments of this application, the indoor unit of the air conditioner may include an air inlet grille 15.

[0071] The air inlet grille 15 is located at the air conditioning inlet 12 to filter the air and prevent larger impurities from entering the heat exchange duct.

[0072] In some embodiments of this application, reference is made to Figure 4 The indoor unit of the air conditioner may include an indoor heat exchanger 2. The indoor heat exchanger 2 extends along the length of the casing 1 and is located in the heat exchange duct for heat exchange with the airflow inside the casing 1.

[0073] In some embodiments of this application, the indoor unit of a wall-mounted air conditioner may include a cross-flow fan 3.

[0074] A cross-flow fan 3 is installed inside the heat exchange duct. The shaft 32 of the cross-flow fan 3 extends along the length of the housing 1 and is used to drive indoor air outside the housing 1 to enter the heat exchange duct inside the housing 1 through the air conditioning inlet 12. The cross-flow fan 3 drives the air in the heat exchange duct to flow along the air conditioning inlet 12 toward the air conditioning outlet 13.

[0075] Continue to refer to Figure 4 The cross-flow fan 3 is located below the indoor heat exchanger 2. The indoor heat exchanger 2 can be located inside the air conditioning inlet 12. The cross-flow fan 3 can be located on the side of the indoor heat exchanger 2 away from the air conditioning inlet 12. That is, in the airflow direction within the housing 1, the cross-flow fan 3 is located downstream of the indoor heat exchanger 2.

[0076] When the indoor unit of the air conditioner is running, driven by the cross-flow fan 3, indoor air enters the heat exchange duct through the air inlet 12. The indoor air in the heat exchange duct flows through the indoor heat exchanger 2 for heat exchange. The air after heat exchange is discharged to the outside through the air outlet 13, thereby enabling the air conditioner to cool and heat, and play the role of regulating the indoor temperature to achieve a comfortable temperature for the user.

[0077] In some embodiments of this application, the housing 1 may include a base 11. The base 11 forms the rear side of the indoor air conditioning unit for mounting the indoor air conditioning unit against a wall.

[0078] In some embodiments of this application, the indoor unit of a wall-mounted air conditioner may include a bearing assembly.

[0079] In some embodiments of this application, reference is made to Figure 5 The housing 1 may include a base 11. The cross-flow fan 3 and the bearing assembly are disposed on the base 11.

[0080] In some embodiments of this application, reference is made to Figures 6-7 The cross-flow fan 3 may include an end cover 31. The end cover 31 forms one end of the cross-flow fan 3 and is disposed opposite to the bearing assembly.

[0081] In some embodiments of this application, reference continues to be made to Figures 6-7 The cross-flow fan 3 may include a shaft 32, which is fixed to the end cover 31 and inserted into the bearing assembly.

[0082] In some embodiments of this application, the bearing assembly may include a bearing housing 4. The bearing assembly is connected to the base 11 via the bearing housing 4.

[0083] In some embodiments of this application, reference is made to Figures 8-9 The bearing housing 4 may include a first reinforcing part 41.

[0084] The first reinforcing part 41 not only strengthens the bearing housing 4, but also serves as part of the labyrinth structure to ensure dust protection.

[0085] In some embodiments of this application, reference continues to be made to Figures 8-9 The bearing housing 4 may include a second reinforcing part 42. The second reinforcing part 42 is sleeved outside the first reinforcing part 41 and is spaced apart from the first reinforcing part 41 to form a first annular cavity. The first annular cavity has a first opening at one end near the end cap 31.

[0086] The second reinforcing part 42 can also strengthen the bearing housing 4. At the same time, the second reinforcing part 42 and the first reinforcing part 41 work together to form an important part of the labyrinth structure, ensuring the dustproof effect.

[0087] In some embodiments of this application, reference continues to be made to Figures 8-9 The bearing housing 4 may include a connecting plate 43, which is arranged parallel to the end cover 31, and its two ends are respectively connected to the first reinforcing part 41 and the second reinforcing part 42 and close the other end of the first annular cavity.

[0088] In some embodiments of this application, reference is made to Figures 6-7 The cross-flow fan 3 may include an annular portion 33, which surrounds a shaft 32 and extends outward from an end cap 31 along the shaft 32. (Reference) Figure 10 The end of the annular portion 33 extends into the first annular cavity from the first opening.

[0089] It should be noted that the fan-motor system of a wall-mounted air conditioner indoor unit generally consists of a drive motor, a fan, and a support bearing. The bearing, fan, and motor are mounted on the base. One side of the fan is connected to the motor, and the other side is supported by the bearing. The fan operates under the support of the motor and bearing. Generally, sliding bearings are used, directly mounted on the base. The fan's metal shaft is inserted into the bearing balls, and the bearing opening is usually exposed in the air duct. However, due to the diverse installation and usage environments of air conditioners, the bearings contain lubricating oil, and the openings are exposed for extended periods. Impurities such as lint and dust from the environment can adhere to the metal shaft and bearings. During air conditioner operation, this generates frictional noise, affecting users' work, study, and rest, resulting in a poor user experience or user complaints. Existing solutions to this problem include reducing the distance between the rubber bearing and the fan side cover to decrease the probability of dust and impurities adhering. However, with this approach, the fan / base undergoes significant dimensional changes due to thermal expansion and contraction, or assembly issues can cause friction between the fan and rubber during operation, failing to fundamentally solve the problem.

[0090] The wall-mounted air conditioner indoor unit provided in this application utilizes the end cover 31, the annular portion 33, and the bearing seat 4 to form a labyrinth structure on one side of the air duct, which prevents impurities from adhering to the bearing 32 without reducing the movement clearance between the cross-flow fan 3 and the bearing 32. This ensures the sealing and dustproof effect on the bearing 32 while avoiding large dimensional changes in the fan / base 11 due to thermal expansion and contraction, or problems such as fan friction against the bearing 32 due to assembly issues.

[0091] In some embodiments of this application, reference is made to Figure 12 On the shaft 32, the distance from the end of the annular portion 33 to the end cover 31 is L2, and the minimum clearance from the bearing assembly to the end cover 31 is L1, where L2 > L1.

[0092] A protruding annular portion 33 is provided on the end cover 31 of the cross-flow fan 3. This annular portion 33 is concentric with the shaft 32 of the cross-flow fan 3. With the shaft 32 pointing upwards, the distance L2 from the end of the annular portion 33 to the end cover 31 is greater than the minimum clearance L1 between the bearing assembly and the end cover 31. The minimum clearance L1 between the bearing assembly and the end cover 31 is the shaft 32 rotational clearance of the fan.

[0093] This application, without reducing the minimum clearance L1 between the bearing assembly and the end cover 31, utilizes a labyrinthine structure formed by the annular portion 33, the first reinforcing portion 41, the second reinforcing portion 42, and the connecting plate 43 to prevent impurities from adhering to the bearing 32 and the shaft 32 of the cross-flow fan 3. It also does not reduce the movement clearance between the cross-flow fan 3 and the bearing 32, thus ensuring a sealing and dustproof effect on the bearing 32 and the shaft 32. At the same time, it avoids large dimensional changes in the fan / base 11 due to thermal expansion and contraction, or problems such as fan operation rubbing against the bearing 32 due to assembly issues.

[0094] In some embodiments of this application, L2 = L1 + 3mm. The overlap range of the spiral maze is 3mm, ensuring the protective effect of the spiral maze and preventing impurities from adhering to the shaft 32 bearing and the shaft 32.

[0095] In some embodiments of this application, reference continues to be made to Figure 12 On the shaft 32, the distance from the end of the annular part 33 to the connecting plate 43 is L3, where L3 > L1.

[0096] Since the annular portion 33 is relatively weak, by limiting the distance L3 from the end of the annular portion 33 on the shaft 32 upward to the connecting plate 43 to be greater than the minimum gap L1 from the bearing assembly to the end cover 31, it is beneficial to prevent the fan from moving erratically when falling, and prevent abnormal noise caused by impact damage to the weak structure.

[0097] In some embodiments of this application, L1 > 3mm. The minimum clearance L1 between the bearing assembly and the end cover 31 is greater than 3mm, which ensures the rotational clearance of the fan shaft 32 and prevents friction on the shaft 32 bearing during fan operation due to manufacturing tolerances, manufacturing deformation, assembly misalignment, thermal expansion and contraction deformation, etc.

[0098] In some embodiments of this application, L1 ≤ 10mm. The minimum gap L1 between the bearing assembly and the end cover 31 is no more than 10mm. This is to prevent waste of the overall machine size and to avoid increased protection difficulty caused by an excessively large minimum gap L1 between the bearing assembly and the end cover 31, which would make it easier for impurities to adhere to the bearing / shaft 32.

[0099] In some embodiments of this application, reference continues to be made to Figure 12 In the radial direction of shaft 32, the minimum clearance between the bearing assembly and the annular portion 33 is L4. The minimum clearance L4 between the bearing assembly and the annular portion 33 is the radial rotation clearance of the fan.

[0100] In some embodiments of this application, the minimum clearance L4 between the bearing assembly and the annular portion 33 is greater than 2mm to prevent damage caused by excessively small clearance, deformation of the components, friction between the fan and the bearing 32 during operation, or impact from drops, etc., where weak structures collide with each other.

[0101] In some embodiments of this application, the minimum gap L4 between the bearing assembly and the annular portion 33 is no greater than 3 mm, to prevent the protective effect from being weakened due to excessive gap.

[0102] In some embodiments of this application, the minimum gap L4 between the bearing assembly and the annular portion 33 is 3mm. If the gap is too small, the rubber parts will deform, causing the fan to rub against the bearing 32 during operation, or the weak structure will collide with each other due to drop impacts, resulting in damage. If the gap is too large, the protective effect of the labyrinth will be weakened.

[0103] In some embodiments of this application, the bearing assembly may further include a bushing 5. The bushing 5 is fitted inside the bearing housing 4, and the shaft 32 of the cross-flow fan 3 is inserted into the bushing 5.

[0104] In some embodiments of this application, the annular portion 33 surrounds the shaft 32 and extends outward from the end cap 31 along the shaft 32 to form a receiving cavity with a second opening. The end of the annular portion 33 extends into the first annular cavity from the first opening, and one end of the bushing 5 extends into the receiving cavity from the second opening.

[0105] This application's wall-mounted air conditioner indoor unit utilizes an end cover 31, an annular portion 33, and a bearing seat 4 to form a labyrinthine structure on one side of the air duct. This structure seals and prevents impurities from adhering to the shaft 32 of the cross-flow fan 3 and the bushing 5. The labyrinthine structure reduces the probability of impurities entering and prevents their adhesion without reducing the movement clearance between the cross-flow fan 3 and the shaft 32 bearing. This ensures a dustproof and sealing effect on the shaft 32 bearing while avoiding large dimensional changes in the fan / base 11 due to thermal expansion and contraction, or problems caused by assembly issues leading to friction between the fan and the shaft 32 bearing. Simultaneously, the annular portion 33 forms a receiving cavity with a second opening. One end of the bushing 5 extends into the receiving cavity from the second opening, further increasing the overlapping area of ​​the labyrinthine structure. This prevents impurities and dust from adhering to the bearing assembly and the shaft 32 of the cross-flow fan 3, improving the protective sealing effect on both the shaft 32 and the bushing 5.

[0106] This application utilizes the end cover 31, the annular portion 33, and the bearing seat 4 to form a labyrinth structure on one side of the air duct, which can achieve a seal on the shaft 32 / shaft 32 bearing, preventing impurities in the environment from sticking to the grease, generating friction noise, and improving sound quality. This application differs from the solution of reducing the exposed size of the shaft 32 bearing and the shaft 32 to reduce the probability of adhesion. This application does not affect the operating clearance of the fan and does not affect the installation of the fan / shaft 32 bearing.

[0107] In some embodiments of this application, reference is made to Figure 11 The bushing 5 may also include a buffer part 51, which is fitted inside the first reinforcing part 41.

[0108] In some embodiments of this application, reference continues to be made to Figure 11 The bushing 5 may also include a bearing ball 52, which is sleeved between the buffer part 51 and the shaft 32 and is rotatably connected to the shaft 32.

[0109] The indoor unit of this wall-mounted air conditioner utilizes the end cover 31, the annular portion 33, and the bearing seat 4 to form a labyrinth structure on one side of the air duct. This structure seals and prevents impurities from adhering to the shaft 32 of the cross-flow fan 3 and the bearing ball 52. The labyrinth structure reduces the probability of impurities entering and prevents them from adhering to the shaft 32 of the cross-flow fan 3 and the bearing ball 52. It does not reduce the movement clearance between the cross-flow fan 3 and the shaft 32 bearing, thus ensuring the sealing and dustproof effect on the shaft 32 bearing. At the same time, it avoids large dimensional changes in the fan / base 11 due to thermal expansion and contraction, or problems such as fan friction against the shaft 32 bearing due to assembly issues.

[0110] In some embodiments of this application, the buffer portion 51 is generally made of rubber, which is beneficial to improving the buffering effect and also to achieving an interference fit between the buffer portion 51 and the bearing ball 52, as well as between the buffer portion 51 and the first reinforcing portion 41.

[0111] In some embodiments of this application, the first reinforcing part 41 may include a first annular plate 411, which is sleeved on the outside of the buffer part 51 and is in an interference fit with the buffer part 51.

[0112] In some embodiments of this application, the first reinforcing part 41 may include a second annular plate 412, which is sleeved outside the first annular plate 411 and spaced apart from the first annular plate 411 to form a second annular cavity. The arrangement of the second annular cavity can provide a good buffering effect for the bearing assembly.

[0113] In some embodiments of this application, the first reinforcing part 41 further includes a plurality of partitions 413 disposed between the first annular plate 411 and the second annular plate 412. The plurality of partitions 413 divide the second annular cavity into a plurality of sector cavities. The presence of the plurality of sector cavities further improves the buffering effect and also strengthens the bearing of the shaft 32.

[0114] 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.

[0115] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A wall-mounted air conditioner indoor unit, characterized in that, include: The housing has an air conditioning inlet and an air conditioning outlet on its top and front bottom sides, respectively, and the housing includes a base. A cross-flow fan, mounted on the base, allows indoor airflow to enter the housing through the air conditioner inlet and then exit to the room through the air conditioner outlet. The cross-flow fan includes: End cap; The shaft is fixed to the end cap; An annular portion surrounds the shaft and extends outward from the end cap along the axial direction of the shaft; A bearing assembly is disposed on the base, and the shaft of the cross-flow fan is inserted into the bearing assembly. The bearing assembly includes a bearing housing, which includes: First Reinforced Division; The second reinforcing part is sleeved outside the first reinforcing part and is spaced apart from the first reinforcing part to form a first annular cavity. The first annular cavity has a first opening at one end near the end cap. A connecting plate is arranged parallel to the end cap, with its two ends respectively connected to the first reinforcing part and the second reinforcing part, and sealing the other end of the first annular cavity; The end of the annular portion extends into the first annular cavity from the first opening.

2. The wall-mounted air conditioner indoor unit according to claim 1, characterized in that, Along the axial direction of the shaft, the distance from the end of the annular portion to the end cap is L2, and the minimum clearance from the bearing assembly to the end cap is L1, where L2 > L1.

3. The wall-mounted air conditioner indoor unit according to claim 2, characterized in that, Along the axial direction of the shaft, the distance from the end of the annular portion to the connecting plate is L3, where L3 > L1.

4. The wall-mounted air conditioner indoor unit according to claim 2, characterized in that, L2 = L1 + 3mm.

5. The wall-mounted air conditioner indoor unit according to claim 2, characterized in that, 3mm <L1≤10mm。 6. The wall-mounted air conditioner indoor unit according to claim 1, characterized in that, In the radial direction of the shaft, the minimum clearance between the bearing assembly and the annular portion is L4.2 mm. <L4≤3mm。 7. The wall-mounted air conditioner indoor unit according to claim 1, characterized in that, The bearing assembly further includes a bushing fitted inside the bearing housing, the bushing comprising: A buffer section is fitted inside the first reinforcing section; The bearing ball is sleeved between the buffer part and the shaft, and is rotatably connected to the shaft.

8. The wall-mounted air conditioner indoor unit according to claim 7, characterized in that, The first reinforcing part includes: The first annular plate is sleeved outside the buffer section; The second annular plate is sleeved outside the first annular plate and spaced apart from the first annular plate to form a second annular cavity.

9. The wall-mounted air conditioner indoor unit according to claim 8, characterized in that, The first reinforcing part further includes a plurality of partitions disposed between the first annular plate and the second annular plate, the plurality of partitions dividing the second annular cavity into a plurality of sector cavities.

10. A wall-mounted air conditioner indoor unit, characterized in that, include: The housing has an air conditioning inlet and an air conditioning outlet on its top and front bottom sides, respectively, and the housing includes a base. A cross-flow fan, mounted on the base, allows indoor airflow to enter the housing through the air conditioner inlet and then exit to the room through the air conditioner outlet. The cross-flow fan includes: End cap; The shaft is fixed to the end cap; An annular portion, surrounding the shaft, and extending outward from the end cap along the axial direction of the shaft to form a receiving cavity with a second opening; A bearing assembly, disposed on the base, includes a bushing sleeve fitted over the shaft to support the cross-flow fan, and a bearing housing fitted over the bushing, the bearing housing comprising: First Reinforced Division; The second reinforcing part is sleeved outside the first reinforcing part and is spaced apart from the first reinforcing part to form a first annular cavity. The first annular cavity has a first opening at one end near the end cap. A connecting plate is arranged parallel to the end cap, with its two ends respectively connected to the first reinforcing part and the second reinforcing part, and sealing the other end of the first annular cavity; The end of the annular portion extends into the first annular cavity from the first opening, and one end of the bushing extends into the receiving cavity from the second opening.

Images