Bearing for air conditioner indoor unit, cross-flow fan and air conditioner indoor unit

Abstract

The utility model provides a bearing for an indoor unit of an air conditioner, a cross-flow fan and the indoor unit of the air conditioner, and the bearing for the indoor unit of the air conditioner comprises a bearing body which is provided with a shaft inner hole in a penetrating manner along the axis direction of the bearing body, and further comprises a plurality of oil storage tanks, the oil storage grooves are formed in the bearing body and located on the outer side of the shaft inner hole, and the oil storage grooves are communicated with the shaft inner hole through oil guide grooves; wherein the oil storage grooves are spirally distributed, and the corresponding oil guide grooves are also spirally distributed. According to the bearing for the indoor unit of the air conditioner, the oil storage groove and the oil guide groove are spirally distributed, so that lubricating grease can be continuously and uniformly distributed on the contact surface of a shaft and the bearing in the rotating process of the bearing, friction and abrasion are effectively reduced, the service life of the bearing is prolonged, and the lubricating grease can be continuously and uniformly distributed on the contact surface of the shaft and the bearing in the running process of the bearing. And the splashing of grease and irregular friction are effectively reduced, and the generation of friction sound and periodic impact noise is reduced, so that the operation noise of the indoor unit of the air conditioner is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air conditioning technical field especially relates to a bearing for air conditioner indoor unit, cross flow fan and air conditioner indoor unit. BACKGROUND

[0002] The cross flow fan blade of air conditioner indoor unit is usually driven to rotate by motor shaft, and the matching design between the shaft of cross flow fan blade and bearing directly affects the operation performance and noise level of air conditioning system. In the current air conditioning design, there is a certain gap between the shaft of cross flow fan blade and bearing, which allows the overflow of lubricating grease through oil tank to form a lubricating layer between the shaft and bearing, so as to reduce friction and prolong service life. However, in the friction process between the shaft of cross flow fan blade and bearing, due to the overflow mode of lubricating grease and the design structure of bearing, especially the existence of oil tank, it is easy to cause unnecessary noise during the operation of air conditioner.

[0003] Specifically, the internal design of bearing commonly used in air conditioner includes three oil tanks, which overflow lubricating grease between the shaft and bearing through vertical axial opening to ensure the continuity of lubrication. Although this design can achieve effective lubrication in most cases, since the vertical oil tank is parallel to the micro scratches on the shaft of cross flow fan blade, at high speed, these scratches interact with the overflow grease of oil tank, which is easy to produce friction sound. In addition, the shaft of cross flow fan blade not only bears sliding friction, but also performs rolling friction in the bearing. And due to the existence of oil tank overflow port, the shaft is not in contact with the bearing all the time during operation, but there is a gap, which causes periodic impact and further increases noise.

[0004] Especially during the operation of air conditioner, the shaft of cross flow fan blade usually has a higher probability of rolling contact in the lower half circle (gravity direction) of bearing due to the influence of gravity. If the oil tank is located in the lower half circle area, the contact between the shaft and bearing will become discontinuous, which will produce periodic impact and irregular friction, increasing the probability of noise generation. These noises not only affect the operation comfort of air conditioner, but also may have adverse effects on the long-term operation of equipment.

[0005] Therefore, how to improve the matching structure of cross flow fan blade shaft and bearing in air conditioner indoor unit to reduce the generation of friction sound and abnormal sound has become an important technical problem in the current air conditioning design. UTILITY MODEL CONTENTS

[0006] In view of the deficiencies in the prior art, the utility model provides a bearing for air conditioner indoor unit, cross flow fan and air conditioner indoor unit, to solve the technical problems that the lubrication and matching design between the shaft of cross flow fan blade and bearing in current air conditioner indoor unit easily lead to friction sound and periodic impact noise, especially irregular friction and abnormal sound when running at high speed and the bearing is affected by gravity.

[0007] The utility model provides a kind of bearing for air conditioner indoor unit, for being installed on cross-flow fan blade, the bearing includes the bearing body being provided with shaft inner hole along its axial direction, further include:

[0008] A plurality of oil reservoirs are arranged on the bearing body and located outside the shaft inner hole, and each of the oil reservoirs is connected to the shaft inner hole through an oil guide groove.

[0009] The oil reservoirs are helically distributed, and the corresponding oil guide grooves are also helically distributed.

[0010] Further, the oil reservoirs are at least three and are arranged along the circumference of the shaft inner hole.

[0011] Further, the three oil reservoirs project onto the end face as a complete circle.

[0012] Further, the oil guide groove has a rounded corner between the oil guide groove and the shaft inner hole.

[0013] Further, the oil reservoirs include a groove body with an open upper end and a closed lower end; the bearing body is further provided with a bearing cover at the open upper end of the groove body, and the bearing cover is internally provided with a cover inner hole.

[0014] Further, the bearing body is provided with a groove at the open upper end of the groove body, and the bearing cover is arranged in the groove to close the open upper end of the groove body.

[0015] Further, the inner diameter of the cover inner hole is equal to or greater than the inner diameter of the shaft inner hole.

[0016] Further, the bearing body and the bearing cover are both made of resin material.

[0017] The utility model also provides a cross-flow fan, which comprises the bearing for air conditioner indoor unit described above, and further comprises:

[0018] A motor; and

[0019] A cross-flow fan blade, one end of which is connected to the output end of the motor, and the other end is provided with a rotating shaft, the rotating shaft is installed on the air conditioner indoor unit through the bearing, and the bearing is provided with a rubber pad.

[0020] The utility model also provides an air conditioner indoor unit, which comprises the cross-flow fan described above.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] 1. The plurality of oil storage grooves are distributed in a spiral manner in the bearing inner hole, so that the rotation of the shaft of the cross-flow fan blade in the bearing is in continuous contact with the surface of the bearing inner hole, avoiding the discontinuous contact of the linear oil groove and the noise generated thereby, thereby improving the noise quality.

[0023] 2. The spiral-shaped oil storage groove has no requirement for the installation angle of the bearing, and has better fault tolerance for the micro defects of the shaft of the cross-flow fan blade. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 Fig. 1 is a structural schematic view of a bearing for an air conditioner indoor unit according to an embodiment of the present application;

[0025] Figure 2 Fig. 2 is a structural schematic view of a bearing for an air conditioner indoor unit according to another embodiment of the present application;

[0026] Figure 3 Fig. 3 is a structural schematic view of the bearing shown in Fig. 1; Figure 2 Fig. 4 is a structural schematic view of the bearing shown in Fig. 2;

[0027] Figure 4 Fig. 5 is a sectional structural schematic view of the bearing shown in Fig. 1; Figure 2 Fig. 6 is a sectional structural schematic view of the bearing shown in Fig. 2;

[0028] Figure 5 Fig. 7 is a structural schematic view of a cross-flow fan according to an embodiment of the present application;

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 10. Bearing body; 11. Shaft inner hole; 111. Annular slope; 12. Oil storage groove; 13. Oil guide groove; 14. Groove;

[0031] 20. Bearing cover; 21. Cover inner hole;

[0032] 30. Motor;

[0033] 40. Cross-flow fan blade; 41. Shaft;

[0034] 50. Rubber pad.

[0035] The implementation, functional features and advantages of the present application will be further described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and beneficial effects of the present application more clear, the technical scheme of the present application will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0037] In the description of the utility model, it is necessary to explain that the structure, ratio, size and the like shown in the drawings attached to the specification are merely used to cooperate with the content disclosed in the specification, for understanding and reading by persons skilled in the art, and are not used to limit the limiting conditions that the utility model can be implemented, so they do not have the substantial significance of technology, any modification of structure, change of proportional relationship or adjustment of size, without affecting the effects and purposes that the utility model can produce, should still fall within the scope covered by the technical content disclosed by the utility model.

[0038] Embodiment 1

[0039] As Figures 1-5 shown, the embodiment of the utility model provides a bearing for indoor unit of air conditioner for installing on cross flow fan blade 40, the bearing includes the bearing body 10 that is equipped with the shaft hole 11 along its axial direction, still includes: a plurality of oil storage groove 12, establish in the bearing body 10 and located the outside of the shaft hole 11, and each oil storage groove 12 with the shaft hole 11 is communicated through the oil guide groove 13, wherein the oil storage groove 12 is helical distribution, and the corresponding oil guide groove 13 is helical distribution.

[0040] In the utility model embodiment, the oil storage groove 12 and the oil guide groove 13 of bearing are helical distribution, not only can ensure that in the bearing rotation process, the lubricating grease can be continuously, evenly distributed to the surface of the shaft and bearing contact, effectively reduce the friction, reduce the wear and tear, prolong the service life of bearing, and the helical oil storage groove 12 and oil guide groove 13 help effectively reduce the splashing and irregular friction of oil when the bearing is running, reduce the generation of friction sound and periodic impact noise, thereby improving the running noise of indoor unit of air conditioner.

[0041] In this embodiment, to ensure that the grease is evenly distributed to all parts of the shaft and bearing during bearing rotation, reducing friction and wear, as well as overheating and damage caused by insufficient lubrication, thereby extending the bearing's service life, at least three oil reservoirs 12 are arranged circumferentially along the inner hole 11 of the shaft. The combined action of multiple oil reservoirs 12 effectively avoids insufficient or uneven lubrication, ensuring the bearing's lubrication needs under high load or high speed rotation. Simultaneously, it allows the grease to be quickly and evenly supplied to critical bearing locations, reducing frictional noise during operation. Secondly, when there are three oil reservoirs 12, their projection onto the end face forms a complete circle, further reducing noise generation. Thirdly, the oil guide groove 13 has a rounded corner between it and the inner hole 11 of the shaft, which facilitates the grease being squeezed and filled into the gap between the shaft and the inner hole 11 as the shaft rotates, further improving noise during operation.

[0042] Specifically, in order to improve the structural stability of the bearing, in this embodiment, the outer side of the middle part of the bearing body 10 protrudes outward and is shaped like a waist drum. This design increases the structural stability and load-bearing capacity of the bearing. Especially when running under high load, it can effectively distribute the force and improve the durability and stability of the bearing.

[0043] Based on the above solutions, such as Figure 4 As shown, in this embodiment, an annular ramp 111 is provided at the end of the shaft inner hole 11 away from the bearing cover 20. The annular ramp 111 can play a guiding role when the bearing and the cross-flow fan blade 40 shaft are assembled, so that the cross-flow fan blade 40 shaft can smoothly enter the shaft inner hole 11 of the bearing.

[0044] Example 2

[0045] like Figures 2-4 As shown, the bearing for an air conditioner indoor unit provided in this embodiment differs from that in Embodiment 1 above in that, in this embodiment, the oil reservoir 12 includes a groove with an open upper end and a closed lower end; the bearing body 10 is also provided with a bearing cover 20 at the upper opening of the groove, and the bearing cover 20 has an inner hole 21 inside. The bearing cover 20 allows the shaft and the bearing body 10 to be connected through the inner hole 21 to ensure smooth rotation of the shaft inside the bearing. By closing the upper opening of the oil reservoir 12 with the bearing cover 20, grease is stored through the closed portion at the lower end of the groove. When the bearing is running, the grease flows through the inner hole 21 of the bearing body 10 and the bearing cover 20 to ensure the lubrication needs inside the bearing. At the same time, the lubricating oil in the oil reservoir 12 is subjected to gravity and can continuously supply the contact surface between the shaft and the bearing, ensuring long-term stable lubrication.

[0046] The bearing body 10 is provided with a groove 14 at the upper end opening of the groove body, and the bearing cover 20 is arranged in the groove 14 to close the upper end opening of the groove body. The bearing cover 20 is firmly embedded in the bearing body 10 through the groove 14, so that the cooperation between the bearing cover 20 and the bearing body 10 is more accurate, the leakage of lubricating oil can be effectively prevented, the sealing and stable flow of oil can be ensured, and the reliability of the overall lubricating system is improved, and meanwhile, the assembly is facilitated.

[0047] Meanwhile, in the embodiment, the inner diameter of the cover inner hole 21 is equal to or greater than the inner diameter of the shaft inner hole 11, which is helpful for the smooth flow of lubricating oil in the bearing system. Since the lubricating oil needs to pass through the shaft inner hole 11 to reach the bearing contact surface, the larger inner diameter of the cover inner hole 21 can ensure the unobstructed flow of lubricating oil and prevent the bearing from being worn or the temperature from being increased due to poor lubricating oil supply.

[0048] Specifically, in the embodiment, the bearing body 10 and the bearing cover 20 are both made of resin material, and the resin material (such as POM, PA, etc.) has certain self-lubricating property, so that the friction can be effectively reduced during operation, the work efficiency is improved, the maintenance requirement is reduced, the energy consumption and wear are reduced. And in another embodiment, the resin material can be added with certain additives, such as graphene and MoS2, to further enhance the self-lubricating property of the material.

[0049] Secondly, the bearing and the bearing cover 20 can be processed into semi-finished products by injection molding, and the inner hole size is finely ground by secondary processing to achieve smaller surface roughness. Of course, in another embodiment, the above molding method can also be a conventional molding method such as die casting and 3D printing.

[0050] As Figure 5As shown, the utility model embodiment further provides a cross flow fan, including the bearing for air conditioner indoor unit, still include motor 30 and cross flow fan blade 40, one end of cross flow fan blade 40 is connected the output of motor 30, and the other end is provided with pivot 41, pivot 41 is installed on air conditioner indoor unit through bearing, and the bearing is equipped with rubber pad 50, in the working process of cross flow fan, motor 30 drives cross flow fan blade 40 to rotate through its output, when cross flow fan blade 40 rotates, it pushes air flow, thereby increasing the air circulation inside air conditioner. The air flow generated by cross flow fan blade 40 can help the evaporator or condenser of air conditioner to better heat exchange, promote the promotion of cooling or heating effect, thereby improve the refrigeration or heating efficiency of air conditioner. And the other end of the fan blade is connected with the pivot 41, and the pivot 41 bears the rotational motion of the fan blade. Since the motor 30 is connected with the cross flow fan blade 40 through the output, the fan blade and the pivot 41 rotate together. At the same time, the pivot 41 is installed in the air conditioner indoor unit through the bearing, the bearing ensures the smooth rotation of the pivot 41 and reduces the friction, and reduces the friction through the internal lubrication mechanism to ensure the smooth operation of the fan blade, improve the working efficiency and service life. In addition, the rubber pad 50 on the bearing plays a shock absorption, noise reduction and protection role, which can effectively absorb the vibration between the pivot 41 and the bearing, reduce the noise caused by mechanical operation, and also reduce the damage or loosening of the bearing caused by vibration. Through the damping effect, the rubber pad 50 can also make the air conditioner indoor unit work more quietly, improve the user experience.

[0051] Example 3

[0052] The utility model embodiment provides a kind of air conditioner indoor unit, including the cross flow fan described in above embodiment 2, since the air conditioner indoor unit of the present application adopts the entire technical solution of above embodiment 2, at least has all beneficial effects brought by the technical solution of above embodiment 2, therefore does not repeat here.

[0053] Finally, it is pointed out that the above embodiments are only used to illustrate the technical solutions of the utility model and are not limited. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the utility model.

Claims

1. A bearing for an indoor unit of an air conditioner for being installed on a cross-flow fan blade (40), the bearing comprising a bearing body (10) having a shaft hole (11) formed in a direction of an axis thereof, characterized in that, Also comprising: a plurality of oil storage grooves (12) arranged on the bearing body (10) and outside the shaft bore (11), and each of the oil storage grooves (12) is connected with the shaft bore (11) through an oil guide groove (13); wherein the oil storage grooves (12) are helically distributed, and the corresponding oil guide grooves (13) are also helically distributed.

2. The bearing for an indoor unit of an air conditioner according to claim 1, wherein The oil storage grooves (12) are at least three and are arranged along the circumference of the shaft bore (11).

3. The bearing for an indoor unit of an air conditioner according to claim 2, wherein The three oil storage grooves (12) project onto the end face as a complete circle.

4. The bearing for an indoor unit of an air conditioner according to claim 1, wherein The oil guide groove (13) has a rounded corner with the shaft bore (11).

5. The bearing for an indoor unit of an air conditioner according to claim 1, wherein The oil storage groove (12) comprises a groove body with an open upper end and a closed lower end; the bearing body (10) is further provided with a bearing cover (20) at the open upper end of the groove body, and the bearing cover (20) is internally provided with a cover bore (21).

6. The bearing for an indoor unit of an air conditioner according to claim 5, wherein The bearing body (10) is provided with a groove (14) at the open upper end of the groove body, and the bearing cover (20) is arranged in the groove (14) to close the open upper end of the groove body.

7. The bearing for an indoor unit of an air conditioner according to claim 5, wherein The inner diameter of the cover bore (21) is equal to or greater than the inner diameter of the shaft bore (11).

8. The bearing for an indoor unit of an air conditioner according to claim 5, wherein The bearing body (10) and the bearing cover (20) are both made of resin material.

9. A cross-flow fan comprising the bearing for an air conditioner indoor unit according to any one of claims 1 to 8, characterized by, Also comprising: a motor (30); and a cross-flow fan blade (40) having one end connected to the output end of the motor (30) and the other end provided with a rotating shaft (41), the rotating shaft (41) being mounted on the indoor unit of the air conditioner through a bearing, and the bearing being provided with a rubber pad (50).

10. An air conditioner indoor unit characterized by comprising: The cross-flow fan comprises the cross-flow fan as claimed in claim 9.

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