An air conditioner indoor unit

Abstract

The application relates to the household electrical appliance technical field and discloses an indoor air conditioner, which comprises a casing, a casing accommodating cavity is formed in the casing, a base, a cross-flow fan and a driving motor are arranged in the casing accommodating cavity, the cross-flow fan comprises an impeller, a fan end cover and a fan shaft, the fan end cover is arranged at one axial end of the impeller; the fan shaft is arranged on the fan end cover; the driving motor comprises an outer rotor, an inner stator and a sliding bearing, the outer rotor is connected to the fan end cover; the inner stator is located on the inner side of the outer rotor and is fixed relative to the casing, the inner stator is provided with a shaft hole; the sliding bearing comprises a shaft sleeve and a bearing bush, the shaft sleeve is arranged in the shaft hole; the bearing bush is arranged in the shaft sleeve, the fan shaft is arranged in the bearing bush; a spiral oil groove is arranged on the inner wall of the bearing bush and spirally extends along the inner wall of the bearing bush. In the application, the spiral shaft groove spirally extending on the inner wall of the bearing bush is arranged, so that the lubricating grease between the bearing bush and the fan shaft is more uniform, the lubricating effect of the lubricating grease is guaranteed, and the fan shaft can smoothly rotate in the bearing bush.

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 its casing. This fan draws indoor air into the casing through the air inlet and out through the air outlet. A drive motor is connected to a heat exchange fan to drive its rotation. The fan shaft of the cross-flow fan is rotatably connected to a shaft hole via a sliding bearing. An oil groove is installed within the bearing bush to lubricate the fan shaft, ensuring smooth rotation.

[0004] However, the oil grooves on the inner wall of the bearing bush are usually straight grooves that extend along the axial direction of the bearing bush. The radiation area of ​​the lubricating grease discharged from the groove is limited, which means that there may be some places on the inner wall of the bearing bush that are not properly lubricated. This causes the fan shaft to have greater friction with the inner wall of the bearing bush when the motor is running at high speed. This not only affects the service life of the fan shaft and sliding bearing, but also causes noise in the indoor unit of the air conditioner, affecting the user's experience. Utility Model Content

[0005] This application discloses an indoor air conditioning unit that can make the lubricating grease between the bearing and the fan shaft more uniform, ensure the lubrication effect of the lubricating grease, and enable the fan shaft to rotate smoothly in the bearing.

[0006] To achieve the above objectives, this application discloses an indoor air conditioner unit, comprising: a housing, wherein a housing receiving cavity is formed within the housing, and the housing receiving cavity is provided with:

[0007] A base, wherein a heat exchange air duct is formed within the base;

[0008] A cross-flow fan is disposed within the heat exchange duct, the cross-flow fan comprising:

[0009] impeller;

[0010] A fan end cover is disposed at one axial end of the impeller;

[0011] The fan shaft is located on the fan end cover;

[0012] A drive motor, used to drive the cross-flow fan to rotate, the drive motor comprising:

[0013] The outer rotor is connected to the fan end cover;

[0014] An inner stator is located inside the outer rotor and is fixed relative to the housing; the inner stator is provided with a shaft hole.

[0015] A sliding bearing, the sliding bearing comprising:

[0016] A bushing is disposed within the shaft hole;

[0017] A bearing bush is disposed within the bushing, and the fan shaft passes through the bearing bush;

[0018] A spiral oil groove is provided on the inner wall of the bearing bush and extends spirally along the inner wall of the bearing bush.

[0019] Thus, the spiral oil groove can generally be shaped like a cylindrical helix. That is, a moving point moves at a constant speed along the generatrix of the cylindrical surface (the generatrix of the cylinder is a rectangular side parallel to the axis of rotation) while simultaneously rotating at a constant speed around the axis of the cylindrical surface. The trajectory of this combined motion of the point is called a cylindrical helix. It is worth noting that the general cylindrical helix shape described here is only one embodiment; the spiral oil groove does not necessarily have to be strictly set up according to a cylindrical helix. As long as it can spiral around the inner wall of the bearing while extending along the axial direction of the bearing, forming a spiral shape, it is acceptable. The spiral oil grooves supply lubricating grease to the inner wall of the bearing and the fan shaft. Because the spiral grooves extend and spiral along the inner wall of the bearing, the lubricating grease can spread simultaneously from both the circumferential and axial directions of the bearing to all parts of the inner wall, resulting in a wider lubrication range and ensuring the grease flows to all locations on the inner wall of the bearing. This makes the distribution of lubricating grease more uniform, preventing inadequate lubrication in certain areas. It ensures that all points between the fan shaft and the inner wall of the bearing are lubricated, preventing excessive friction between the fan shaft and the inner wall of the bearing during high-speed motor operation, which could affect the service life of the fan shaft and sliding bearings, and cause noise in the indoor air conditioning unit, thus impacting the user experience.

[0020] As an optional implementation, the sliding bearing further includes:

[0021] A straight oil groove is provided on the inner wall of the bearing bush and extends along the axial direction of the bearing bush. The spiral oil groove intersects with and communicates with the straight oil groove.

[0022] Thus, the straight oil grooves and the spiral oil grooves together form the oil groove structure of the bearing bush. As the spiral oil groove extends and spirals along the inner wall of the bearing bush, it intersects and connects with the straight oil grooves, allowing lubricating grease to flow in both grooves. When there is excess lubricating grease in the straight oil grooves, it flows into the spiral oil grooves, and vice versa. Moreover, the connection and intersection of the spiral and straight oil grooves allow them to work together to form a new oil groove structure on the inner wall of the bearing bush. Lubricating grease overflowing from this structure can cover all parts of the inner wall of the bearing bush, allowing it to flow more evenly, improving lubrication efficiency and reducing wear between the bearing bush and the fan shaft.

[0023] As an optional implementation, the sliding bearing further includes:

[0024] A bearing cap is provided on the first end face of the bearing bush along the axial direction of the bearing bush;

[0025] An oil reservoir, the cavity of which is disposed in the body of the bearing bush, is used to store lubricating grease. The opening of the oil reservoir penetrates the first end face. The spiral oil groove and / or the straight oil groove are connected to the cavity of the oil reservoir.

[0026] Thus, the inclusion of an oil reservoir enhances the oil storage capacity of the bearing, allowing it to hold more lubricating grease and extend its service life. The oil reservoir's cavity is located within the bearing body to store lubricating grease. The groove's opening penetrates the first end face of the bearing, enabling oil filling after the bearing cap is removed. After filling, the bearing cap is replaced to prevent grease leakage. The oil reservoir's cavity can connect with a spiral oil groove. As the spiral oil groove moves, lubricating grease can enter the linear oil groove, allowing both grooves to lubricate the inner wall of the bearing. The oil reservoir can also connect with both spiral and linear oil grooves, allowing lubricating grease to enter the spiral oil groove as it moves, thus providing lubrication to the inner wall of the bearing. By using oil reservoirs, spiral oil grooves, and straight oil grooves, self-lubrication capabilities can be enhanced, dependence on external grease supply can be reduced, the maintenance cycle of bearing bushes can be extended, the maintenance frequency can be reduced, the bearing life can be improved, and local high temperature and fatigue damage can be reduced.

[0027] As an optional implementation, the number of the linear oil grooves is multiple;

[0028] There are multiple oil storage tanks, which extend along the axial direction of the bearing bush. Each oil storage tank is arranged in a one-to-one correspondence with a straight oil groove, and each oil storage tank is connected to the corresponding straight oil groove along the radial direction of the bearing bush.

[0029] Thus, there can be three straight oil grooves, which can be evenly spaced along the inner wall of the bearing bush. This allows the lubricating grease flowing from the straight oil grooves to be distributed throughout the entire inner wall of the bearing bush, reducing lubrication dead zones. There can also be one or more oil reservoirs, with three reservoirs corresponding to the three straight oil grooves. Each straight oil groove is connected to its corresponding reservoir, ensuring that each straight oil groove has sufficient lubricating grease through the replenishment effect of the reservoir. As an optional implementation, along the axial direction of the bearing bush, the distance between the first endpoint of the spiral oil groove and the first end face of the bearing bush is l1, the distance between the second endpoint of the spiral oil groove and the second end face of the bearing bush is l2, and the distance between the center points of two adjacent spiral oil grooves is l0. Where l1, l2, and l0 satisfy l1 ≤ l0 and l2 ≤ l0.

[0030] Thus, by limiting l1≤l0, the distance between the first end of the spiral oil groove and the first end face of the bearing bush can be avoided from being too far, which would affect the lubrication coverage of the spiral oil groove. By limiting l2≤l0, the distance between the second end of the spiral oil groove and the second end face of the bearing bush can be avoided from being too far, which would also affect the lubrication coverage of the spiral oil groove. By limiting l1≤l0 and l2≤l0, the spiral oil groove can cover the entire inner wall of the bearing bush along the axial direction, ensuring that there is lubricating grease in all parts of the inner wall of the bearing bush, improving lubrication performance and extending the service life of the bearing.

[0031] As an optional implementation, the opening area of ​​the spiral oil groove on the inner wall of the bearing bush is A1, the opening area of ​​the straight oil groove on the inner wall of the bearing bush is A2, and the surface area of ​​the inner wall of the bearing bush is A0, wherein A1, A2, and A0 satisfy: 0.25A0≤A1+A2, and A1+A2≤0.5A0.

[0032] Thus, limiting 0.25A0≤A1+A2 can prevent the sum of the opening areas of the spiral oil groove and the straight oil groove from being too small, which would not provide sufficient lubricating grease to the inner wall of the bearing. Limiting A1+A2≤0.5A0 can prevent the sum of the opening areas of the spiral oil groove and the straight oil groove from being too large, which would result in insufficient surface area of ​​the inner wall of the bearing to support the fan shaft and affect the strength of the bearing.

[0033] As an optional implementation, the sliding bearing further includes:

[0034] An annular oil groove is provided on the first end face of the bearing cover along the radial direction of the bearing bush. The annular oil groove is adjacent to the oil storage tank. The outer periphery of the annular oil groove has an oil inlet that communicates with the oil storage tank. The inner periphery of the annular oil groove has an oil outlet that penetrates the inner wall of the bearing bush.

[0035] In this way, the annular oil groove can provide lubricating grease, further ensuring that all parts of the inner wall of the bearing bush are lubricated with grease, improving lubrication performance and extending the service life of the bearing.

[0036] As an optional implementation, the annular oil groove is connected to the linear oil groove along the axial direction of the bearing bush.

[0037] In this way, by connecting the annular oil groove with the straight oil groove, and further connecting the spiral oil groove with the straight oil groove, the annular oil groove, the straight oil groove, and the spiral oil groove can form an "oil groove system" that allows the lubricating grease to flow in and out of the annular oil groove, the straight oil groove, and the spiral oil groove. This makes it easier for the lubricating grease to flow to all parts of the inner wall of the bearing, ensuring that there is lubricating grease in all parts of the inner wall of the bearing, improving lubrication performance, and extending the service life of the bearing.

[0038] As an optional implementation, the outer radius of the annular oil groove is r1, and the radius of the bearing cover is r2, wherein r1 and r2 satisfy: r1 < r2, and r2 - r1 > 4 mm.

[0039] Thus, by limiting the outer circumferential radius r1 of the annular oil groove to be less than the radius r2 of the bearing cap, and r2-r1>4mm, it is possible to avoid the radius of the annular oil groove being too large, which would result in insufficient area on the first end face of the bearing cap to support the bearing cap, affecting the strength of the bearing and reducing its lifespan.

[0040] As an optional implementation, the depth of the annular oil groove along the axial direction of the bearing bush is h, wherein h satisfies: 0.2mm≤h and h≤1mm.

[0041] Thus, limiting the depth of the annular oil groove h to ≤ 1 mm can prevent the annular oil groove from being too deep, which would significantly reduce the support area of ​​the inner wall of the bearing on the fan shaft and affect the strength of the bearing. Limiting the depth to 0.2 mm ≤ h can prevent the annular oil groove from being too shallow, which would result in limited oil output or even no oil output, preventing the lubricating grease in the oil reservoir from entering the inner wall of the bearing and affecting the oil output lubrication effect of the annular oil groove.

[0042] Compared with the prior art, the beneficial effects of this application are:

[0043] The air conditioner indoor unit provided in this application embodiment drives a fan shaft to rotate via a drive motor. The fan shaft engages with a sliding bearing, and a spiral oil groove is provided on the inner wall of the sliding bearing bush. The spiral oil groove provides lubricating grease between the fan shaft and the inner wall of the bush. Due to the special structure of the spiral oil groove, it extends and spirals along the inner wall of the bush, allowing the lubricating grease to be distributed throughout all areas of the inner wall of the bush. This avoids the phenomenon of insufficient lubrication in certain areas of the inner wall of the bush, ensuring that all areas between the fan shaft and the inner wall of the bush are lubricated. This prevents excessive friction between the fan shaft and the inner wall of the bush during high-speed motor operation, which would affect the service life of the fan shaft and the sliding bearing, cause noise in the air conditioner indoor unit, and affect the user experience. Attached Figure Description

[0044] 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.

[0045] Figure 1 This is a schematic diagram of the structure of an air conditioner indoor unit disclosed in an embodiment of this application;

[0046] Figure 2 This is a schematic cross-sectional view of the indoor unit of an air conditioner disclosed in an embodiment of this application;

[0047] 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;

[0048] Figure 4 This is a structural schematic diagram of an air conditioner indoor unit, omitting the casing and some internal structures, from another angle disclosed in an embodiment of this application.

[0049] Figure 5 This is a cross-sectional structural diagram of an air conditioner indoor unit disclosed in an embodiment of this application, omitting the casing and part of the internal structure;

[0050] Figure 6 for Figure 5 Enlarged structural diagram at point A;

[0051] Figure 7 This is a schematic diagram of the structure of the sliding bearing disclosed in the embodiments of this application;

[0052] Figure 8 This is a schematic diagram of the cross-sectional structure of the sliding bearing disclosed in an embodiment of this application;

[0053] Figure 9 This is a schematic diagram of the structure of the bearing bush disclosed in the embodiments of this application;

[0054] Figure 10 This is a structural schematic diagram of the bearing bush disclosed in an embodiment of this application from another angle;

[0055] Figure 11 This is a structural schematic diagram of the bearing bush disclosed in the embodiments of this application from another angle;

[0056] Figure 12 This is a schematic diagram of the cross-sectional structure of the bearing bush disclosed in the embodiments of this application;

[0057] Figure 13 This is a schematic diagram of the structure of a bearing bush disclosed in another embodiment of this application;

[0058] Figure 14 This is a schematic diagram of the cross-sectional structure of a bearing bush disclosed in another embodiment of this application;

[0059] Figure 15 This is a schematic cross-sectional view of the bearing bush disclosed in another embodiment of this application;

[0060] Figure 16 This is a schematic diagram showing the dimensions of an annular oil groove disclosed in another embodiment of this application;

[0061] Figure 17 This is a schematic diagram showing the dimensions of the spiral oil groove disclosed in the embodiments of this application.

[0062] Explanation of reference numerals in the attached figures:

[0063] 100-Indoor unit of air conditioner; 10-Casing; 101-Casing cavity; 20-Base; 201-Heat exchange air duct; 30-Cross-flow fan; 31-Impeller; 32-Fan end cover; 33-Fan shaft; 40-Drive motor; 41-Outer rotor; 42-Inner stator; 43-Sliding bearing; 431-Shaft sleeve; 432-Bearing bush; 433-Helical oil groove; 434-Straight oil groove; 435-Bearing cover; 436-Oil reservoir; 437-Annular oil groove; 4371-Oil inlet; 4372-Oil outlet; a-Axial direction of the bearing bush. Detailed Implementation

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] The indoor unit of the air conditioner has a cross-flow fan installed inside its casing. This fan draws indoor air into the casing through the air inlet and out through the air outlet. A drive motor is connected to a heat exchange fan to drive its rotation. The fan shaft of the cross-flow fan is rotatably connected to a shaft hole via a sliding bearing. An oil groove is installed within the bearing bush to lubricate the fan shaft, ensuring smooth rotation.

[0071] If the oil groove on the inner wall of the bearing is a straight groove that extends along the axial direction of the bearing, the lubricating grease in the groove can only flow from the width direction of the straight groove (i.e., the circumferential direction of the bearing) to both sides. This limits the radiation area of ​​the lubricating grease discharged from the straight groove. Moreover, along the width direction of the straight groove, the farther away from the groove, the less lubricating grease there is. This results in some areas of the inner wall of the bearing that are not properly lubricated. Consequently, when the motor is running at high speed, the fan shaft and the inner wall of the bearing will have greater friction. This not only affects the service life of the fan shaft and the sliding bearing, but also causes noise in the indoor unit of the air conditioner, affecting the user experience.

[0072] Based on this, this application discloses an air conditioner indoor unit that can make the lubricating grease between the bearing and the fan shaft more uniform, ensure the lubrication effect of the lubricating grease, and enable the fan shaft to rotate smoothly in the bearing.

[0073] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0074] Please see Figures 1 to 8 , Figure 1 This is a schematic diagram of the structure of the air conditioner indoor unit 100 disclosed in the embodiments of this application. Figure 2 This is a schematic cross-sectional view of the indoor unit 100 of the air conditioner disclosed in an embodiment of this application. Figure 3 This is a schematic diagram of the air conditioner indoor unit 100 disclosed in this application, omitting the casing 10 and part of the internal structure. Figure 4 This is a structural schematic diagram of the air conditioner indoor unit 100 from another angle, omitting the casing 10 and part of the internal structure, as disclosed in the embodiments of this application. Figure 5 This is a cross-sectional structural diagram of the air conditioner indoor unit 100 disclosed in this application, omitting the casing 10 and part of the internal structure. Figure 6 for Figure 5 Enlarged structural diagram at point A in the middle. Figure 7 This is a schematic diagram of the structure of the sliding bearing 43 disclosed in an embodiment of this application. Figure 8This is a cross-sectional structural diagram of the sliding bearing 43 disclosed in an embodiment of this application. This application discloses an air conditioner indoor unit 100, which includes a housing 10. A housing cavity 101 is formed within the housing 10. The housing cavity 101 contains a base 20, a cross-flow fan 30, and a drive motor 40. A heat exchange duct 201 is formed within the base 20. The cross-flow fan 30 is disposed within the heat exchange duct 201 and includes an impeller 31, a fan end cover 32, and a fan shaft 33. The fan end cover 32 is disposed at one axial end (a) of the impeller 31. The fan shaft 33 is disposed at the fan end cover 32. The drive motor 40 uses... The drive motor 40, which drives the cross-flow fan 30 to rotate, includes an outer rotor 41, an inner stator 42, and a sliding bearing 43. The outer rotor 41 is connected to the fan end cover 32. The inner stator 42 is located inside the outer rotor 41 and is fixed relative to the housing 10. The inner stator 42 has a shaft hole. The sliding bearing 43 includes a bushing 431 and a bearing shell 432. The bushing 431 is disposed in the shaft hole. The bearing shell 432 is disposed in the bushing 431. The fan shaft 33 passes through the bearing shell 432. The spiral oil groove 433 is disposed on the inner wall of the bearing shell 432 and extends spirally along the inner wall of the bearing shell 432.

[0075] Combination Figure 1 In some embodiments, the indoor unit 100 of the air conditioner includes a housing 10, which is provided with a housing air inlet and a housing air outlet, and a housing receiving cavity 101 is formed inside the housing 10.

[0076] In some embodiments, a heat exchanger is provided within the housing cavity 101. The heat exchanger is used to exchange heat with the airflow passing through the air inlet of the housing 10. When the air conditioner is cooling, the low-temperature refrigerant flowing within the heat exchanger 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 typically employs 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.

[0077] Combination Figure 2 , Figure 3 and Figure 4 In some embodiments, a cross-flow fan 30 is provided inside the housing cavity 101. The cross-flow fan 30 is used to introduce airflow into the housing through the housing air inlet, and after heat exchange by the heat exchanger, it is delivered to the room through the housing air outlet. During operation, the cross-flow fan 30 generates negative pressure by rotating, drawing indoor air in through the housing air inlet. After heat exchange by the heat exchanger, the processed air is then delivered into the room through the housing air outlet by the thrust of the fan, completing the circulation and renewal of indoor air. The cross-flow fan 30 includes an impeller 31, a fan end cover 32, and a fan shaft 33. The fan end cover 32 is disposed at one axial end of the impeller 31, and the fan shaft 33 is disposed on the fan end cover 32.

[0078] Combination Figure 6In some embodiments, the drive motor 40 can be an external rotor 41 motor, which includes an external rotor 41 and an inner stator 42. The inner stator 42 has a shaft hole. The external rotor 41 is connected to the end of the cross-flow fan 30, and the inner stator 42 is disposed inside the external rotor 41. The inner stator 42 is the core for generating the rotating magnetic field. The external rotor 41 rotates with the rotating magnetic field and drives the fan to rotate synchronously. The external rotor 41 motor can output greater torque to meet the low-speed, high-flow air delivery requirements of the cross-flow fan 30.

[0079] Combination Figure 7 In some embodiments, the drive motor 40 may also include a sliding bearing 43. The sliding bearing 43 has a strong load-bearing capacity, can withstand heavy loads, has good stability when running at high speeds, and can avoid the vibration problems that may occur with rolling bearings. Moreover, it has excellent impact resistance and can evenly distribute impact loads. Under high load conditions, the oil film of the sliding bearing 43 can provide more stable low-friction operation.

[0080] Combination Figure 8 In some embodiments, the sliding bearing 43 may include a bearing shell 432 and a bushing 431. The bearing shell 432 is the part that contacts the journal (the journal refers to the part of the fan shaft 33 supported by the sliding bearing 43). The bearing shell 432 may be made of plastic or wear-resistant materials such as copper-based alloys or Babbitt alloys. The bearing shell 432 is in direct contact with the fan shaft 33 and bears the load. The bushing 431 is fitted around the outer periphery of the bearing shell 432. The bushing 431 can provide support for the bearing shell 432. The bushing 431 may be made of an elastic material, such as rubber, which can absorb vibration, reduce the vibration and noise transmitted to the air conditioner indoor unit 100 when the fan shaft 33 rotates, improve the stability of the air conditioner indoor unit 100, and improve the user experience.

[0081] Combination Figure 8In some embodiments, the sliding bearing 43 may further include a spiral oil groove 433. The spiral oil groove 433 extends spirally along the inner wall of the bearing bush 432. The spiral oil groove 433 may be generally cylindrically spiral in shape, that is, a moving point moves at a constant speed in a straight line along the generatrix of the cylindrical surface (the generatrix of the cylinder is a rectangular side parallel to the axis of rotation), while the generatrix rotates at a constant speed around the axis of the cylindrical surface. The trajectory of this composite motion of the point is called a cylindrical spiral. It is worth noting that the general cylindrical spiral shape here is only one embodiment. The spiral oil groove 433 does not necessarily have to be strictly set according to a cylindrical spiral. As long as it can spiral along the inner wall of the bearing bush 432 and extend along the axial direction a of the bearing bush 432 to form a spiral shape, it is acceptable. The spiral oil groove 433 supplies lubricating grease to the inner wall of the bearing 432 and the fan shaft 33. Because the spiral oil groove 433 extends and spirals along the inner wall of the bearing 432, the lubricating grease can spread simultaneously from both the circumferential and axial directions of the bearing 432 to all parts of its inner wall. This results in a wider range of lubricating grease distribution, allowing it to reach all parts of the inner wall of the bearing 432. This ensures a more uniform distribution of lubricating grease, preventing inadequate lubrication in certain areas. It also ensures that all areas between the fan shaft 33 and the inner wall of the bearing 432 are lubricated, preventing excessive friction between the fan shaft 33 and the inner wall of the bearing 432 during high-speed motor operation. This prevents the service life of the fan shaft 33 and the sliding bearing 43, and also avoids noise from the indoor unit 100, which would negatively impact the user experience.

[0082] According to an embodiment of the present invention, the indoor unit 100 of the air conditioner is driven by a drive motor 40 to rotate a fan shaft 33. The fan shaft 33 cooperates with a sliding bearing 43, and a spiral oil groove 433 is provided on the inner wall of the bearing bush 432 of the sliding bearing 43. The spiral oil groove 433 provides lubricating grease between the fan shaft 33 and the inner wall of the bearing bush 432. Due to the special structure of the spiral oil groove 433, it extends along the inner wall of the bearing bush 432, which can make the lubricating grease cover all areas of the inner wall of the bearing bush 432. This can avoid the phenomenon that some parts of the inner wall of the bearing bush 432 are not properly lubricated, so that all parts between the fan shaft 33 and the inner wall of the bearing bush 432 are lubricated. This avoids excessive friction between the fan shaft 33 and the inner wall of the bearing bush 432 when the motor is running at high speed, which would affect the service life of the fan shaft 33 and the sliding bearing 43, and cause noise in the indoor unit 100, affecting the user's experience.

[0083] Combination Figure 8 In some embodiments, the sliding bearing 43 further includes a straight oil groove 434, which is disposed on the inner wall of the bearing bush 432 and extends along the axial direction a of the bearing bush 432. The spiral oil groove 433 intersects and communicates with the straight oil groove 434.

[0084] Specifically, the sliding bearing 43 may also include other curved oil grooves, inclined oil grooves, etc., and a straight oil groove 434 may also be provided on the inner wall of the bearing bush 432. The straight oil groove 434 extends along the axial direction a of the bearing bush 432 and can penetrate the entire bearing bush 432. The straight oil groove 434 and the spiral oil groove 433 together form the oil groove structure of the bearing bush 432. During the process of spiraling and extending on the inner wall of the bearing bush 432, the spiral oil groove 433 intersects and connects with the straight oil groove 434, so that the lubricating grease can flow in the spiral oil groove 433 and the straight oil groove 434. When there is too much lubricating grease in the straight oil groove 434, it flows into the spiral oil groove 433, and when there is too much lubricating grease in the spiral oil groove 433, it flows into the straight oil groove 434. Furthermore, the connection and intersection of the spiral oil groove 433 and the straight oil groove 434 enable the spiral oil groove 433 and the straight oil groove 434 to cooperate with each other and form a new oil groove structure on the inner wall of the bearing 432. The lubricating grease overflowing from this oil groove structure can cover all parts of the inner wall of the bearing 432, so that the lubricating grease can flow more evenly to all parts of the inner wall of the bearing 432, improving lubrication efficiency and reducing wear between the bearing 432 and the fan shaft 33.

[0085] Combination Figure 8 In some embodiments, the sliding bearing 43 further includes a bearing cover 435 and an oil reservoir 436. The bearing cover 435 is disposed on the first end face of the bearing bush 432 along the axial direction a of the bearing bush 432. The groove cavity of the oil reservoir 436 is disposed in the body of the bearing bush 432 for storing lubricating grease. The groove opening of the oil reservoir 436 penetrates the first end face. The spiral oil groove 433 and / or the straight oil groove 434 communicate with the groove cavity of the oil reservoir 436.

[0086] Specifically, lubricating grease can be directly injected into the spiral oil groove 433 and the straight oil groove 434, or an oil reservoir 436 can be provided to supply lubricating grease to the spiral oil groove 433 and the straight oil groove 434. The oil reservoir 436 allows the bearing bush 432 to have better oil storage function, storing more lubricating grease and extending its service life. The groove cavity of the oil reservoir 436 is located within the body of the bearing bush 432 to store lubricating grease. The groove opening penetrates the first end face of the bearing bush 432, allowing oil to be injected into the reservoir cavity after the bearing cover 435 is removed. After oil injection, the bearing cover 435 is replaced to prevent lubricating grease from leaking out of the groove opening. The cavity of the oil reservoir 436 can be connected to the spiral oil groove 433. During the spiral movement of the spiral oil groove 433, the lubricating grease can enter the straight oil groove 434, so that the spiral oil groove 433 and the straight oil groove 434 together provide lubricating grease to the inner wall surface of the bearing 432. The cavity of the oil reservoir 436 can also be connected to the straight oil groove 434. During the movement of the straight oil groove 434, the lubricating grease can enter the spiral oil groove 433, so that the spiral oil groove 433 and the straight oil groove 434 together provide lubricating grease to the inner wall surface of the bearing 432. The oil reservoir 436 can also be connected to both the spiral oil groove 433 and the straight oil groove 434, so that the spiral oil groove 433 and the straight oil groove 434 together provide lubricating grease to the inner wall surface of the bearing 432. The oil reservoir 436, spiral oil reservoir 433, and straight oil reservoir 434 enhance self-lubrication capabilities, reduce reliance on external grease supply, extend the maintenance cycle of the bearing bush 432, reduce maintenance frequency, improve bearing life, and reduce local high temperature and fatigue damage.

[0087] Combination Figures 8 to 12 , Figure 9 This is a schematic diagram of the structure of the bearing 432 disclosed in an embodiment of this application. Figure 10 This is a structural schematic diagram of the bearing 432 disclosed in an embodiment of this application from another angle. Figure 11 This is a structural schematic diagram of the bearing 432 disclosed in an embodiment of this application from another angle. Figure 12 This is a schematic cross-sectional view of the bearing bush 432 disclosed in an embodiment of this application. In some embodiments, there are multiple straight oil grooves 434 and multiple oil storage grooves 436. The oil storage grooves 436 extend along the axial direction a of the bearing bush 432. The oil storage grooves 436 are arranged in a one-to-one correspondence with the straight oil grooves 434, and each oil storage groove 436 is connected to the corresponding straight oil groove 434 along the radial direction of the bearing bush 432.

[0088] Specifically, the number of straight oil grooves 434 can be one or more, with a maximum of three. These three straight oil grooves 434 can be evenly spaced along the inner wall of the bearing bush 432, allowing the lubricating grease flowing from the straight oil grooves 434 to be distributed throughout the entire inner wall of the bearing bush 432, reducing lubrication dead zones. The number of oil reservoirs 436 can also be one or more, with a maximum of three. These three oil reservoirs 436 are arranged one-to-one with the three straight oil grooves 434, and each straight oil groove 434 is connected to its corresponding oil reservoir 436. This ensures that each straight oil groove 434 receives sufficient lubricating grease from the oil reservoir 436. Furthermore, the depth of the oil reservoir 436 along the axial direction a of the bearing bush 432 can be the same as the length of the straight oil groove 434 along the axial direction a of the bearing bush 432, so that all positions of the straight oil groove 434 along the radial direction of the bearing bush 432 are connected to the oil reservoir 436, allowing the lubricating grease in the oil reservoir 436 to quickly enter the straight oil groove 434.

[0089] Combination Figure 8 and Figure 17 , Figure 17 This is a schematic diagram showing the dimensions of the spiral oil groove 433 disclosed in an embodiment of this application. In some embodiments, along the axial direction a of the bearing bush 432, the distance between the first end point of the spiral oil groove 433 and the first end face of the bearing bush 432 is l1, the distance between the second end point of the spiral oil groove 433 and the second end face of the bearing bush 432 is l2, and the distance between the center points of two adjacent grooves of the spiral oil groove 433 is l0, wherein l1, l2, and l0 satisfy l1≤l0 and l2≤l0.

[0090] Specifically, the spiral oil groove 433 extends spirally along the inner wall of the bearing bush 432, so that the spiral oil groove 433 has multiple grooves along the axial direction a of the bearing bush 432. The distance between the center points of two adjacent grooves is l0, which can be 1 mm. The first end of the spiral oil groove 433 is closest to the first end face of the bearing bush 432, and the distance between them is l1, which can be 0.5 mm. The second end of the spiral oil groove 433 is closest to the second end face of the bearing bush 432, and the distance between them is l2, which can be 0 mm. That is, the second end of the spiral oil groove 433 is in contact with the surrounding second end face. By limiting l1≤l0, the distance between the first end point of the spiral oil groove 433 and the first end face of the bearing bush 432 can be avoided from being too far, which would affect the lubrication coverage of the spiral oil groove 433. By limiting l2≤l0, the distance between the second end point of the spiral oil groove 433 and the second end face of the bearing bush 432 can be avoided from being too far, which would also affect the lubrication coverage of the spiral oil groove 433. By limiting l1≤l0 and l2≤l0, the spiral oil groove 433 can cover the entire inner wall of the bearing bush 432 along the axial direction a, ensuring that there is lubricating grease in all parts of the inner wall of the bearing bush 432, improving lubrication performance and extending the service life of the bearing.

[0091] Combination Figure 10 In some embodiments, the opening area of ​​the spiral oil groove 433 on the inner wall of the bearing bush 432 is A1, the opening area of ​​the straight oil groove 434 on the inner wall of the bearing bush 432 is A2, and the surface area of ​​the inner wall of the bearing bush 432 is A0, wherein A1, A2, and A0 satisfy: 0.25A0≤A1+A2, and A1+A2≤0.5A0.

[0092] Specifically, the opening area A1 of the spiral oil groove 433 and the opening area A2 of the straight oil groove 434 have a certain proportional relationship with the total surface area A0 of the inner wall of the bearing bush 432. Specifically, limiting 0.25A0≤A1+A2 can prevent the sum of the opening areas of the spiral oil groove 433 and the straight oil groove 434 from being too small, which would not be able to provide sufficient lubricating grease to the inner wall of the bearing bush 432. Limiting A1+A2≤0.5A0 can prevent the sum of the opening areas of the spiral oil groove 433 and the straight oil groove 434 from being too large, which would result in the inner wall of the bearing bush 432 not having enough surface area to support the fan shaft 33 and affect the strength of the bearing bush 432.

[0093] Combination Figure 13 , Figure 14 and Figure 15 , Figure 13 This is a schematic diagram of the structure of the bearing 432 disclosed in another embodiment of this application. Figure 14 This is a schematic cross-sectional view of the bearing bush 432 disclosed in another embodiment of this application. Figure 15This is a cross-sectional structural diagram of the bearing bush 432 disclosed in another embodiment of this application. In some embodiments, the sliding bearing 43 further includes an annular oil groove 437, which is disposed on the first end face of the bearing cover 435. Along the radial direction of the bearing bush 432, the annular oil groove 437 is disposed adjacent to the oil reservoir 436. The outer periphery of the annular oil groove 437 has an oil inlet 4371, which communicates with the oil reservoir 436. The inner periphery of the annular oil groove 437 has an oil outlet 4372, which penetrates the inner wall surface of the bearing bush 432.

[0094] Specifically, the oil groove 433 can be provided alone, or an annular oil groove 437 and a spiral oil groove 433 can be provided, or an annular oil groove 437, a spiral oil groove 433 and a straight oil groove 434 can be provided in combination to form an oil groove structure. The annular oil groove 437 can provide lubricating grease, further ensuring that all parts of the inner wall of the bearing bush 432 are lubricated with grease, improving lubrication performance and extending the service life of the bearing.

[0095] Combination Figure 13 , Figure 14 and Figure 15 In some embodiments, along the axial direction a of the bearing bush 432, the annular oil groove 437 is connected to the linear oil groove 434.

[0096] Specifically, the annular oil groove 437 can be set independently and connected only to the oil reservoir 436, or the annular oil groove 437 can be connected to the straight oil groove 434, and then connected to the spiral oil groove 433 and the straight oil groove 434. This allows the annular oil groove 437, the straight oil groove 434 and the spiral oil groove 433 to form an "oil groove system" that allows the lubricating grease to flow in and out of the annular oil groove 437, the straight oil groove 434 and the spiral oil groove 433. This makes it easier for the lubricating grease to flow to all parts of the inner wall of the bearing bush 432, ensuring that there is lubricating grease in all parts of the inner wall of the bearing bush 432, improving lubrication performance and extending the service life of the bearing.

[0097] Combination Figure 16 In some embodiments, the outer radius of the annular oil groove 437 is r1, and the radius of the bearing cover 435 is r2, wherein r1 and r2 satisfy: r1 < r2, and r2 - r1 > 4 mm.

[0098] Specifically, the inner circumferential surface of the annular oil groove 437 is coplanar with the inner wall surface of the bearing bush 432, and both have the same radius and their axes are on the same straight line. The outer circumferential radius r1 of the annular oil groove 437 is limited to the radius r2 of the bearing cover 435, and r2-r1>4mm. This can prevent the radius of the annular oil groove 437 from being too large, which would result in insufficient area on the first end face of the bearing cover 435 to support the bearing cover 435, affecting the strength of the bearing and reducing its life.

[0099] Combination Figure 16 In some embodiments, the depth of the annular oil groove 437 along the axial direction a of the bearing bush 432 is h, wherein h satisfies: 0.2mm≤h and h≤1mm.

[0100] Specifically, limiting the depth h of the annular oil groove 437 to ≤1mm can prevent the annular oil groove 437 from being too deep, which would significantly reduce the support area of ​​the inner wall of the bearing bush 432 on the fan shaft 33 and affect the strength of the bearing. Limiting the depth to 0.2mm≤h can prevent the annular oil groove 437 from being too shallow, which would result in limited oil output or even no oil output, preventing the lubricating grease in the oil reservoir 436 from entering the inner wall of the bearing bush 432 and affecting the oil output lubrication effect of the annular oil groove 437.

[0101] 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 air conditioner indoor unit (100), characterized in that, include: A housing (10) is provided, wherein a housing receiving cavity (101) is formed within the housing (10), and the housing receiving cavity (101) is provided with: A base (20) having a heat exchange duct (201) formed therein; A cross-flow fan (30) is disposed within the heat exchange duct (201), and the cross-flow fan (30) includes: Impeller (31); A fan end cover (32) is disposed at one end of the impeller (31) along the axial direction (a); A fan shaft (33) is disposed on the fan end cover (32); A drive motor (40) for driving the cross-flow fan (30) to rotate, the drive motor (40) comprising: The outer rotor (41) is connected to the fan end cover (32); The inner stator (42) is located inside the outer rotor (41) and is fixed relative to the housing (10). The inner stator (42) is provided with a shaft hole. A sliding bearing (43), the sliding bearing (43) comprising: A bushing (431) is disposed within the shaft hole; A bearing bush (432) is disposed inside the bushing (431), and the fan shaft (33) passes through the bearing bush (432); A spiral oil groove (433) is provided on the inner wall of the bearing (432) and extends spirally along the inner wall of the bearing (432).

2. The air conditioner indoor unit (100) according to claim 1, characterized in that, The sliding bearing (43) also includes: A straight oil groove (434) is provided on the inner wall of the bearing (432) and extends along the axial direction (a) of the bearing (432). The spiral oil groove (433) intersects and communicates with the straight oil groove (434).

3. The indoor unit (100) of the air conditioner according to claim 2, characterized in that, The sliding bearing (43) also includes: A bearing cap (435) is provided on the first end face of the bearing bush (432) along the axial direction (a) of the bearing bush (432); An oil reservoir (436) is provided in the body of the bearing bush (432) for storing lubricating grease. The opening of the oil reservoir (436) penetrates the first end face. The spiral oil groove (433) and / or the straight oil groove (434) are connected to the cavity of the oil reservoir (436).

4. The air conditioner indoor unit (100) according to claim 3, characterized in that, The number of the linear oil grooves (434) is multiple; There are multiple oil storage tanks (436), which extend along the axial direction (a) of the bearing bush (432). The oil storage tanks (436) are arranged in a one-to-one correspondence with the straight oil grooves (434), and each oil storage tank (436) is connected to the corresponding straight oil groove (434) along the radial direction of the bearing bush (432).

5. The air conditioner indoor unit (100) according to claim 1, characterized in that, Along the axial direction (a) of the bearing bush (432), the distance between the first end point of the spiral oil groove (433) and the first end face of the bearing bush (432) is l1, the distance between the second end point of the spiral oil groove (433) and the second end face of the bearing bush (432) is l2, and the distance between the center points of two adjacent grooves of the spiral oil groove (433) is l0, wherein l1, l2, and l0 satisfy l1≤l0 and l2≤l0.

6. The air conditioner indoor unit (100) according to claim 2, characterized in that, The opening area of ​​the spiral oil groove (433) on the inner wall of the bearing bush (432) is A1, the opening area of ​​the straight oil groove (434) on the inner wall of the bearing bush (432) is A2, and the surface area of ​​the inner wall of the bearing bush (432) is A0. Wherein, A1, A2, and A0 satisfy: 0.25A0≤A1+A2, and A1+A2≤0.5A0.

7. The air conditioner indoor unit (100) according to claim 3, characterized in that, The sliding bearing (43) also includes: An annular oil groove (437) is provided on the first end face of the bearing cover (435) along the radial direction of the bearing bush (432). The annular oil groove (437) is adjacent to the oil reservoir (436). The outer periphery of the annular oil groove (437) has an oil inlet (4371) that communicates with the oil reservoir (436). The inner periphery of the annular oil groove (437) has an oil outlet (4372) that penetrates the inner wall of the bearing bush (432).

8. The air conditioner indoor unit (100) according to claim 7, characterized in that, Along the axial direction (a) of the bearing bush (432), the annular oil groove (437) is connected to the straight oil groove (434).

9. The air conditioner indoor unit (100) according to claim 8, characterized in that, The outer radius of the annular oil groove (437) is r1, and the radius of the bearing cover is r2, wherein r1 and r2 satisfy: r1 < r2, and r2 - r1 > 4 mm.

10. The air conditioner indoor unit (100) according to claim 9, characterized in that, Along the axial direction (a) of the bearing bush (432), the depth of the annular oil groove (437) is h, wherein h satisfies: 0.2mm≤h and h≤1mm.

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