Air conditioner fan shaft rotating structure

Abstract

This utility model discloses a rotating structure for an air conditioner fan shaft, including a fan shaft and bearing nut. The bearing nut is fixed to the fan cover by a bearing seat, and a shaft hole is provided through the bearing nut. The bearing nut is sleeved on the fan shaft and rotatably engages with the fan shaft. It also includes multiple oil storage chambers disposed within the bearing nut, which are evenly distributed in a ring around the axis of the shaft hole. The oil storage chambers are connected to the shaft hole through an oil channel. The wall surface of the shaft hole is an arc surface with a central convex shape. This utility model reduces the contact area between the bearing nut and the fan shaft, thus effectively reducing the requirements for the roughness and roundness of the contact surface between the bearing nut and the fan shaft. This reduces the production cost and improves the production efficiency of the air conditioner. Furthermore, the reduced contact area effectively reduces the frictional noise generated by the contact between the bearing nut and the fan shaft, thereby improving the user experience.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning equipment technology, and in particular to an air conditioning fan shaft rotation structure. Background Technology

[0002] The fan in an air conditioner indoor unit is a rotatable structure. The fan is mounted via a fan shaft, one end of which is fixedly connected to the motor on the air guide frame, while the other end is mounted in the fan cover via a bearing. Because the fan shaft and bearing are rotatably fitted, friction occurs between the fan shaft and the bore wall of the bearing during rotation, generating noise. To meet users' increasingly high demands for low noise, air conditioner manufacturers often improve the roughness and roundness of the contact surface between the bearing and the fan shaft by increasing machining precision, thereby reducing friction and noise. However, this machining method, due to its high precision requirements, significantly impacts the overall production cost and efficiency of the air conditioner. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an air conditioner fan shaft rotation structure that can effectively reduce the rotation noise of the fan shaft and reduce the requirements for machining accuracy.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an air conditioner fan shaft rotation structure, including a fan shaft and bearing granules, the bearing granules being fixed on the fan cover by bearing seats, the bearing granules having a through shaft hole, the bearing granules being sleeved on the fan shaft and rotatably engaged with the fan shaft; it also includes multiple oil storage cavities disposed in the bearing granules, the multiple oil storage cavities being evenly distributed in a ring around the axis of the shaft hole, the oil storage cavities being connected to the shaft hole through an oil delivery groove; the hole wall surface of the shaft hole is an arc surface with a central convexity.

[0005] As a further improvement to the above scheme: the oil storage cavity and the oil delivery groove both extend axially along the shaft hole, the same end of the oil storage cavity and the oil delivery groove are both closed ends, and the other end is both open ends, and the open end of the oil storage cavity and the open end of the oil delivery groove are connected; an end cap that closes the open ends of the oil storage cavity and the oil delivery groove can also be detachably fixed on the bearing pellet, and the end cap is an annular end cap coaxial with the shaft hole.

[0006] As a further improvement to the above solution: the end of the bearing pellet is provided with an installation groove that fits into the end cover, and the opening end of the oil storage cavity and the opening end of the oil delivery groove are both connected to the installation groove; when the end cover is installed in the installation groove of the bearing pellet, the outer side of the end cover is flush with the end face of the bearing pellet.

[0007] As a further improvement to the above solution: the distance between the two ends of the shaft hole and the fan shaft is different, and the distance between the end of the shaft hole closer to the mounting groove and the fan shaft is greater than the distance between the end of the shaft hole farther from the mounting groove and the fan shaft.

[0008] As a further improvement to the above solution: the transition point between the oil delivery channel and the shaft hole, as well as the transition point between the oil delivery channel and the oil storage cavity, are all flared by setting an inclined surface; and the slope of the inclined surface at the transition point between the oil delivery channel and the shaft hole is greater than the slope of the inclined surface at the transition point between the oil delivery channel and the oil storage cavity.

[0009] As a further improvement to the above scheme, the number of oil storage chambers and oil delivery tanks is three.

[0010] The beneficial effects of this utility model are as follows: By improving the structure of the bearing nut that mates with the air conditioner fan shaft, this utility model sets the shaft hole wall of the bearing nut to a centrally convex arc surface. Only the convex part of the shaft hole of the bearing nut contacts the fan shaft, thereby reducing the contact area between the bearing nut and the fan shaft. This effectively reduces the requirements for the roughness and roundness of the contact surface between the bearing nut and the fan shaft, thereby reducing the production cost of the air conditioner and improving its production efficiency. Furthermore, due to the reduction in the contact area, the frictional noise generated by the contact between the bearing nut and the fan shaft is also effectively reduced, thus improving the user experience. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 This is a side sectional view of the present invention;

[0013] Figure 3 This is a schematic diagram of the bearing granule structure;

[0014] Figure 4 This is a side sectional view of the bearing pellet.

[0015] The markings in the diagram are: 100-fan shaft, 200-bearing nut, 210-shaft hole, 220-oil reservoir, 230-oil delivery groove, 240-mounting groove, 250-end cover. Detailed Implementation

[0016] To facilitate understanding of this utility model, the following description, in conjunction with the accompanying drawings, will provide further details.

[0017] In the description of this utility model, it should be noted that the terms "front", "rear", "left", "right", "up", "down", "inner", 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 description and do not indicate or imply that the device or component 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 utility model.

[0018] like Figure 1 and Figure 2 As shown, the air conditioner fan shaft rotation structure disclosed in this utility model consists of a fan shaft 100 and a bearing nut 200. The bearing nut 200 has an axially penetrating shaft hole 210 in its center, both end faces of the bearing nut 200 are flat, and its circumferential surface is arc-shaped. One end of the fan shaft 100 is connected to a motor, which drives the fan shaft 100 to rotate. The bearing nut 200 is sleeved on the other end of the fan shaft 100, and the fan shaft 100 passes through the shaft hole 210 of the bearing nut 200 to form a rotatable fit with it. The bearing nut 200 is fixed to the air conditioner's fan cover by a mating bearing seat.

[0019] like Figures 1 to 4 As shown, this invention improves the structure of the bearing nut 200 to reduce noise generated by rotational friction between the fan shaft 100 and the bearing nut 200. This invention sets the wall surface of the shaft hole 210 of the bearing nut 200, which directly contacts the fan shaft 100, as an arc surface, so that the middle part of the hole wall surface of the shaft hole 210 protrudes radially towards the fan shaft 100. Therefore, the contact area between the fan shaft 100 and the shaft hole 210 is limited to the protruding middle part of the shaft hole 210, greatly reducing the contact area between the fan shaft 100 and the bearing nut 200. This effectively reduces the frictional noise generated by the fan shaft 100 during rotation due to contact with the bearing nut 200. Simultaneously, because this invention reduces the contact area between the fan shaft 100 and the bearing nut 200, the requirements for the roughness and roundness of the contact surface between the fan shaft 100 and the bearing nut 200 are reduced, lowering the precision requirements in production, thereby effectively reducing production costs and improving production efficiency.

[0020] Another method in this invention to reduce frictional noise between the fan shaft 100 and the bearing 200 is to provide lubricating oil to reduce the coefficient of friction between the fan shaft 100 and the bearing 200. For example... Figure 1As shown in Figure 4, this invention provides multiple oil storage cavities 220 within the bearing grain 200, arranged in a ring around the axis of the shaft hole 210. The number of oil storage cavities 220 can be set according to actual usage requirements. For example, three oil storage cavities 220 are preferred in this invention, and the corresponding number of oil delivery grooves 230 that cooperate with the oil storage cavities 220 is also three. This provides sufficient strength for the bearing grain 200 while ensuring ample oil storage space. If too many oil storage cavities 220 are provided, the internal space of the bearing grain 200 may be too large, affecting the overall strength of the bearing grain 200. The oil storage cavity 220 is formed by hollowing out the portion between the outer circumferential surface of the bearing grain 200 and the wall of the shaft hole 210; the oil storage cavity 220 is connected to the shaft hole 210 through the oil delivery grooves 230. By injecting lubricating oil into the oil reservoir 220, the lubricating oil is stored in the oil reservoir 220. During the rotation of the fan shaft 100 relative to the bearing 200, the lubricating oil stored in the oil reservoir 220 flows into the shaft hole 210 through the oil delivery groove 230, lubricating the contact surface between the shaft hole 210 and the fan shaft 100, thereby effectively reducing the coefficient of friction between the two contact surfaces, and further reducing the noise generated by friction.

[0021] Specifically, such as Figure 3 and Figure 4 As shown, both the oil reservoir 220 and the oil delivery groove 230 extend axially along the shaft hole 210. Both the oil reservoir 220 and the oil delivery groove 230 have a closed end at one end and an open end at the other. The open end of the oil reservoir 220 and the open end of the oil delivery groove 230 are connected, allowing lubricating oil to be injected into the oil reservoir 220 through its open end. Figure 1 As shown, an end cap 250, which closes the openings of both the oil reservoir 220 and the oil channel 230, can be detachably fixed to the bearing housing 200. The end cap 250 is an annular end cap coaxial with the shaft hole 210, and a through hole adapted to the fan shaft 100 is provided in the middle of the end cap 250. When lubricating oil needs to be added, the end cap 250 is removed from the bearing housing 200, exposing the opening of the oil reservoir 220, and lubricating oil can be injected into the oil reservoir 220. After the oil is added, the end cap 250 is reinstalled on the bearing housing 200 to close the oil reservoir 220. Figure 3 and Figure 4 As shown, an installation groove 240 is provided at the end of the bearing granule 200 to fit with the end cap 250. The open end of the oil storage cavity 220 and the open end of the oil delivery groove 230 are both connected to the installation groove 240. When the end cap 250 is installed in the installation groove 240 of the bearing granule 200, the outer side of the end cap 250 is flush with the end face of the bearing granule 200 to avoid affecting the appearance of the bearing granule 200 due to the protrusion of the end cap 250.

[0022] Furthermore, such as Figure 2 and Figure 4 As shown, in this invention, the distances between the two ends of the shaft hole 210 of the bearing housing 200 and the fan shaft 100 are set differently; specifically, the distance between the end of the shaft hole 210 near the mounting groove 240 and the fan shaft 100 is greater than the distance between the end of the shaft hole 210 away from the mounting groove 240 and the fan shaft 100. Through this structural optimization, more lubricating oil can flow into the gap between the end of the shaft hole 210 near the mounting groove 240 and the fan shaft 100, and some lubricating oil can flow into the gap between the end cover 250 and the fan shaft 100 to lubricate the end cover 250 and the fan shaft 100, reducing the coefficient of friction of the contact surfaces of the end cover 250 and the fan shaft 100.

[0023] Furthermore, such as Figure 3 As shown, in this invention, the transition points between the oil delivery groove 230 and the shaft hole 210, as well as the transition points between the oil delivery groove 230 and the oil storage cavity 220, are both flared by setting inclined surfaces; and the slope of the inclined surface at the transition point between the oil delivery groove 230 and the shaft hole 210 is greater than the slope of the inclined surface at the transition point between the oil delivery groove 230 and the oil storage cavity 220. By setting flared surfaces in the above structural improvement, the lubricating oil in the oil storage cavity 220 can enter the oil delivery groove 230, and the lubricating oil flowing from the oil delivery groove 230 into the shaft hole 210 can quickly diffuse and coat the surface of the fan shaft 100 as soon as possible.

Claims

1. An air conditioner fan shaft rotation structure, comprising a fan shaft (100) and a bearing nut (200), wherein the bearing nut (200) is fixed to the fan cover by a bearing seat, the bearing nut (200) is provided with a through shaft hole (210), and the bearing nut (200) is sleeved on the fan shaft (100) and rotatably engaged with the fan shaft (100); characterized in that: It also includes multiple oil storage cavities (220) disposed in the bearing grain (200). The multiple oil storage cavities (220) are evenly distributed in a ring around the axis of the shaft hole (210). The oil storage cavities (220) are connected to the shaft hole (210) through the oil delivery groove (230). The hole wall of the shaft hole (210) is an arc surface with a central protrusion.

2. The air conditioner fan shaft rotation structure as described in claim 1, characterized in that: The oil storage cavity (220) and the oil delivery groove (230) both extend axially along the shaft hole (210). The same end of the oil storage cavity (220) and the oil delivery groove (230) are both closed ends, and the other end is an open end. The open end of the oil storage cavity (220) and the open end of the oil delivery groove (230) are connected. The bearing pellet (200) can also be detachably fixed with an end cap (250) that closes the open ends of the oil storage cavity (220) and the oil delivery groove (230). The end cap (250) is an annular end cap coaxial with the shaft hole (210).

3. The air conditioner fan shaft rotation structure as described in claim 2, characterized in that: The bearing pellet (200) has an installation groove (240) at its end that fits into the end cap (250). The opening end of the oil storage chamber (220) and the opening end of the oil delivery groove (230) are both connected to the installation groove (240). When the end cap (250) is installed in the installation groove (240) of the bearing pellet (200), the outer side of the end cap (250) is flush with the end face of the bearing pellet (200).

4. The air conditioner fan shaft rotation structure as described in claim 3, characterized in that: The distances between the two ends of the shaft hole (210) and the fan shaft (100) are different. The distance between the end of the shaft hole (210) near the mounting groove (240) and the fan shaft (100) is greater than the distance between the end of the shaft hole (210) away from the mounting groove (240) and the fan shaft (100).

5. The air conditioner fan shaft rotation structure as described in claim 1, characterized in that: The transition points between the oil delivery groove (230) and the shaft hole (210) and between the oil delivery groove (230) and the oil storage cavity (220) are all flared by setting inclined surfaces; and the slope of the inclined surface at the transition point between the oil delivery groove (230) and the shaft hole (210) is greater than the slope of the inclined surface at the transition point between the oil delivery groove (230) and the oil storage cavity (220).

6. The air conditioner fan shaft rotation structure as described in claim 1, characterized in that: The number of oil storage chambers (220) and oil delivery tanks (230) is three.

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