Outer rotor motor, air conditioner and dehumidifier

Abstract

The invention provides an outer rotor motor, an air conditioner and a dehumidifier, which comprises an end cover, the end cover is provided with a bearing seat, the bearing seat is provided with a bearing chamber, the bearing chamber is internally provided with an oil bearing, the oil bearing is internally provided with a rotating shaft, the direction of the rotating shaft extending out of the outer rotor motor is a first side, and the direction of the rotating shaft extending out of the outer rotor motor is a second side. One side, opposite to the first side, of the oil bearing is a first end, the other side, opposite to the first side, of the oil bearing is a second side, the end, facing the first side, of the oil bearing is a first end, the other end of the oil bearing is a second end, and the peripheral face, within the preset distance from the end face of the first end to the second end, of the oil bearing is a first oil storage face; and a first oil storage space is formed by a space surrounded by the first oil storage surface, the inner surface of the bearing chamber and the first plugging ring, so that the technical problem that the oil storage space is relatively small when an oil storage groove is formed in the oil bearing in the prior art can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of outer rotor motors, and in particular relates to an outer rotor motor, an air conditioner and a dehumidifier. Background Art

[0002] In the context of the increasing cost sensitivity of the current home appliance market, small-power motors with oil-containing bearings have become the first choice of many home appliance manufacturers due to their low cost, compact design and high efficiency. For example, in the condensate circulation system of mobile air conditioners, portable air conditioners and mobile dehumidifiers, small-power motors with oil-containing bearings drive the fan blades to pump water. However, traditional oil-containing bearings are made of metal or alloy through a precision sintering process to form a porous structure rich in lubricating oil, but their porosity is limited by the manufacturing process, resulting in limited initial lubricating oil capacity. As the motor continues to run, the amount of lubricating oil in the oil-containing bearing will gradually decrease due to multiple factors such as evaporation, centrifugal throw-out and natural leakage, which directly increases the dynamic friction resistance between the bearing and the shaft, and then causes severe wear, which not only significantly shortens the service life of the oil-containing bearing, but also indirectly affects the operating life and reliability of the entire machine.

[0003] To address this industry pain point, the current solution commonly adopted in the industry is to add an oil storage tank inside the oil-containing bearing to try to replenish the lubricating oil. However, the uneven force on the physical structure of the oil storage tank on both sides of the axial direction of the oil-containing bearing poses a risk of causing the oil-containing bearing to break. When ensuring the structural strength of the bearing, the volume of the oil storage tank is small and it is difficult to meet the oil-containing bearing's demand for lubricating oil.

[0004] How to increase the oil storage space for lubricating oil in oil-containing bearings while ensuring the structural strength of the oil-containing bearings is a technical solution that urgently needs to be solved. Summary of the invention

[0005] The invention provides an outer rotor motor, an air conditioner and a dehumidifier, which can solve the technical problem in the prior art that when an oil-containing bearing is provided with an oil storage tank, the oil storage space is small.

[0006] The present invention provides an outer rotor motor, comprising an end cover, wherein the end cover is provided with a bearing seat, the bearing seat is provided with a bearing chamber, an oil-containing bearing is provided in the bearing chamber, a rotating shaft is provided in the oil-containing bearing, the direction in which the rotating shaft extends out of the outer rotor motor is a first side, and the other side opposite to the first side is a second side, one end of the oil-containing bearing facing the first side is a first end, and the other end is a second end, the outer peripheral surface of the oil-containing bearing within a preset distance from the end face of the first end to the second end is a first oil storage surface, a first sealing ring is sleeved on the rotating shaft, and the first oil storage surface, the inner surface of the bearing chamber and the space surrounded by the first sealing ring constitute a first oil storage space.

[0007] In some embodiments, the first oil storage surface is a conical surface, and the end of the conical surface facing the first end is a small end.

[0008] In some embodiments, the inner wall surface of the bearing chamber covering the first oil storage space is a second oil storage surface, and the second oil storage surface is provided with an annular protrusion surrounding the oil-containing bearing at one end close to the first side, and the inner circumferential surface of the annular protrusion is in contact with the conical surface at one end close to the second side.

[0009] In some embodiments, the inner circumferential surface of the annular protrusion is provided with a plurality of first grooves extending along the axial direction of the rotating shaft, and the first grooves penetrate the annular protrusion.

[0010] In some embodiments, a retaining groove is provided on the rotating shaft, a retaining ring is sleeved in the retaining groove, the retaining ring is located on the side of the first sealing ring facing the first side, the first sealing ring is in contact with the end face of the first end of the oil-containing bearing, and an elastic ring is sleeved on the rotating shaft between the retaining ring and the first sealing ring, and the elastic ring is in an extruded state.

[0011] In some embodiments, the outer rotor motor further comprises a rotor shell fixed to the second end of the rotating shaft, a rotor boss is provided on the side of the rotor shell facing the first side, and a surface of the rotor boss facing the first side contacts an end surface of the oil-containing bearing.

[0012] In some embodiments, the bearing chamber is located on the side of the end cover facing the second side, a stator assembly is fixed to the outer periphery of the bearing seat, the stator assembly includes a rear end portion surrounding the rotor boss, and the space between the inner circumferential surface of the rear end portion and the outer circumferential surface of the rotor boss constitutes a second oil storage space.

[0013] In some embodiments, an outer peripheral surface of the oil-containing bearing is provided with an oil guide groove, and the oil guide groove connects the first oil storage space and the second oil storage space.

[0014] In some embodiments, a second sealing ring is sleeved on the outer periphery of the rotor boss, and the second sealing ring is arranged on a side of the second oil storage space facing the second side.

[0015] In some embodiments, a plurality of second grooves are provided on the end surface of the bearing seat facing the second side, and the second grooves penetrate the bearing seat along the radial direction.

[0016] In some embodiments, the stator assembly includes a stator core, and an oil absorption gasket surrounding the rotating shaft is provided at one end of the stator core facing the second side. In the axial direction, the oil absorption gasket surrounds the outer side of the second groove and contacts the bearing seat.

[0017] In some embodiments, a plurality of third grooves extending along the axial direction of the rotating shaft are provided on the inner circumferential surface of the rear end portion.

[0018] In some embodiments, the distance from the bottom surface of the third groove to the axis of the rotating shaft gradually increases from the second side to the first side.

[0019] In some embodiments, a spiral groove is provided on the outer peripheral surface of the rotor boss, and the rotation direction of the spiral groove from the second side to the first side is opposite to the rotation direction of the outer rotor motor in a working state.

[0020] In some embodiments, the circumference of the outer peripheral surface of the rotor boss gradually increases from the second side to the first side.

[0021] The invention provides an air conditioner, comprising the outer rotor motor.

[0022] The present invention also provides a dehumidifier, comprising the outer rotor motor.

[0023] The present invention provides an outer rotor motor with a first oil storage space arranged on the outer periphery of the first end of the oil-containing bearing, so that the overall structure of the oil-containing bearing is more complete, the impact on the structural strength of the oil-containing bearing is relatively small, and the volume of the oil storage space can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0025] Figure 1 is an exploded view of an outer rotor motor according to an embodiment of the present invention;

[0026] Figure 2 is a radial cross-sectional view of an outer rotor motor according to an embodiment of the present invention;

[0027] Figure 3 The embodiment of the present invention Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 The embodiment of the present invention Figure 2 Enlarged view of point B in the middle;

[0029] Figure 5 is a schematic structural diagram of an oil-containing bearing according to an embodiment of the present invention;

[0030] Figure 6 is a schematic diagram of the end cover structure of an embodiment of the present invention;

[0031] Figure 7 is a schematic diagram of a stator assembly of an embodiment of the present invention being fixed on an end cover;

[0032] Figure 8 is a schematic structural diagram of a stator assembly according to an embodiment of the present invention;

[0033] Fig. 9 is a schematic diagram of a rotor housing and a rotating shaft being fixed together in an embodiment of the present invention;

[0034] Fig.10 is a schematic diagram of the effect of the rotor boss on the lubricating oil when the rotating shaft drives the rotor shell to rotate according to an embodiment of the present invention;

[0035] Fig.11 is a schematic diagram of the lubricating oil flowing from the second oil storage space to the first oil storage space according to an embodiment of the present invention;

[0036] Fig.12 is a schematic diagram of the appearance of an outer rotor motor according to an embodiment of the present invention;

[0037] The accompanying drawings are marked as follows:

[0038] 1. End cover; 101. Annular protrusion; 102. Slot; 103. Snap ring; 104. Elastic ring; 105. Bearing seat; 1051. Bearing chamber; 2. Oil-containing bearing; 201. Oil guide groove; 3. Rotating shaft; 401. First oil storage surface; 402. Second oil storage surface; 501. First sealing ring; 502. Second sealing ring; 601. First oil storage space; 602. Second oil storage space; 701. First groove; 702. Second groove; 703. Third groove; 801. Rotor shell; 802. Rotor boss; 803. Spiral groove; 804. Control board; 805. Water-retaining rubber ring; 901. Stator assembly; 902. Rear end; 903. Plastic-coated frame; 904. Stator core; 905. Permanent magnet; 906. Oil absorption gasket. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0041] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0042] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0043] How to increase the oil storage space of the motor using the oil-containing bearing while ensuring the structural strength of the oil-containing bearing is a technical solution that urgently needs to be solved.

[0044] See also Figure 1-12As shown, an outer rotor motor comprises an end cover 1, wherein the end cover 1 is provided with a bearing seat 105, wherein the bearing seat 105 is provided with a bearing chamber 1051, wherein an oil-containing bearing 2 is provided in the bearing chamber 1051, wherein a rotating shaft 3 is provided in the oil-containing bearing 2, wherein the rotating shaft 3 extends out of the outer rotor motor in a direction as a first side, and the other side opposite to the first side is a second side, wherein one end of the oil-containing bearing 2 facing the first side is a first end, and the other end is a second end, and an outer peripheral surface of the oil-containing bearing 2 within a preset distance from the end face of the first end to the second end is a first oil storage surface 401, and a first sealing ring 501 is sleeved on the rotating shaft 3, and the first oil storage surface 401, the inner surface of the bearing chamber 1051 and the space surrounded by the first sealing ring 501 constitute a first oil storage space 601.

[0045] The main body is provided with a first oil storage surface 401 at one end of the oil-containing bearing 2, so that the first oil storage surface 401, the first sealing ring 501 and the inner surface of the bearing chamber 1051 constitute a first oil storage space 601. Compared with the prior art in which an oil groove is provided on the oil-containing bearing 2, the first oil storage space 601 of the present application is located at one end of the first side of the oil-containing bearing 2, so that the overall structure of the oil-containing bearing 2 is more complete, and the impact on the structural strength of the oil-containing bearing 2 is small, thereby increasing the volume of the oil storage space while ensuring the structural strength of the oil-containing bearing 2. The first oil storage space 601 is close to the first side, and the part of the rotating shaft 3 extending out of the motor is the output end, which needs to drive external components, which results in a poor stress environment at the end of the oil-containing bearing 2 close to the first side, requiring more sufficient lubrication. The first oil storage space 601 is provided at the end close to the first side to improve the lubrication performance of the oil-containing bearing 2 to the rotating shaft 3 and the performance of the outer rotor motor.

[0046] The “axial direction” in this application refers to the axial direction of the rotating shaft 3 , the “radial direction” in this application refers to the radial direction of the rotating shaft 3 , and the “circumferential direction” in this application refers to the circumferential direction of the rotating shaft 3 .

[0047] Preferably, Figure 1 and Figure 3 As shown, the first oil storage surface 401 is a conical surface, and the end of the conical surface facing the first end is a small end.

[0048] The first oil storage surface 401 is a conical surface, which reduces the processing difficulty on the one hand, and makes the overall structure of the oil-containing bearing 2 more complete on the other hand. The shape change of the oil-containing bearing 2 from the first end to the second end is smoother, which greatly reduces the stress caused by the shape change.

[0049] Preferably, Figure 1 and Figure 3As shown, the inner wall surface of the bearing chamber 1051 covering the first oil storage space 601 is the second oil storage surface 402, and the second oil storage surface 402 is provided with an annular protrusion 101 surrounding the oil-containing bearing 2 at one end close to the first side, and the inner circumferential surface of the annular protrusion 101 is in contact with the conical surface at one end close to the second side.

[0050] The inner circumferential surface of the annular protrusion 101 is in contact with the conical surface at one end close to the second side. On the one hand, the annular protrusion 101 has an axial limiting effect on the oil-containing bearing 2, so that the oil-containing bearing 2 can be accurately fixed in the end cover 1; on the other hand, the position where the annular protrusion 101 contacts the conical surface divides the first oil storage space 601 into two spaces, which helps to prevent the lubricating oil from flowing out of the first oil storage space 601.

[0051] Preferably, Figure 3 and Figure 6 As shown, the inner circumferential surface of the annular protrusion 101 is provided with a plurality of first grooves 701 extending along the axial direction of the rotating shaft 3 , and the first grooves 701 penetrate the annular protrusion 101 .

[0052] The above-mentioned first groove 701 is arranged on the annular protrusion 101, and more lubricating oil can be stored in the first groove 701, thereby increasing the oil storage amount in the first oil storage space 601; further, along the circumferential direction, the width of the first groove 701 is arranged to be smaller, for example, between 1 mm and 2 mm, so that the lubricating oil can stay in the first groove 701, and when the lubricating oil in the first oil storage space 601 except the first groove 701 has been completely consumed and evaporated, there will still be some lubricating oil in the first groove 701, and since the contact area between the lubricating oil in the first groove 701 and the air is smaller, this part of the lubricating oil will evaporate more slowly, and the evaporated oil mist will contact with the oil-containing bearing 2 and be absorbed by the oil-containing bearing 2, thereby lubricating the oil-containing bearing 2, which is beneficial to increasing the working time of the oil-containing bearing 2. Of course, compared with the direct attachment of the lubricating oil to the surface of the oil-containing bearing 2, the efficiency of lubricating the oil-containing bearing 2 by evaporating the lubricating oil in the first groove 701 and being absorbed by the oil-containing bearing 2 is lower. However, this method can extend the consumption time of the lubricating oil and increase the working time of the oil-containing bearing 2 under certain lubrication performance, thereby increasing the working time of the outer rotor motor (the working time after filling with lubricating oil once).

[0053] Preferably, Figure 2 and Figure 3As shown, a slot 102 is provided on the rotating shaft 3, and a snap ring 103 is sleeved in the slot 102. The snap ring 103 is located on the side of the first sealing ring 501 facing the first side. The first sealing ring 501 is in contact with the end face of the first end of the oil-containing bearing 2. An elastic ring 104 is sleeved on the rotating shaft 3 between the snap ring 103 and the first sealing ring 501, and the elastic ring 104 is in an extruded state.

[0054] On the one hand, the retaining ring 103 is arranged in the groove 102 to limit the axial direction of the rotating shaft 3. On the other hand, the elastic ring 104 is sleeved between the retaining ring 103 and the first sealing ring 501. The elastic ring 104 is in an extrusion state. Since the retaining ring 103 is clamped in the groove 102 on the rotating shaft 3, the axial position of the retaining ring 103 on the rotating shaft 3 is fixed. The elastic ring 104 exerts an extrusion effect on the first sealing ring 501 between the retaining ring 103 and the first sealing ring 501, thereby making the first sealing ring 501 contact with the end face of the first end of the oil-containing bearing 2, thereby improving the sealing effect of the first sealing ring 501 on the first oil storage space 601. Since the first sealing ring 501 is in contact with the oil-containing bearing 2, when the first sealing ring 501 rotates relative to the rotating shaft 3, the oil-containing bearing 2 can lubricate the first sealing ring 501, thereby reducing the friction; further, the first sealing ring 501 is a graphite gasket, and the lubricating properties of graphite are used to further improve the lubricity between the first sealing ring 501 and the oil-containing bearing 2.

[0055] Furthermore, a water-blocking rubber ring 805 is sleeved on the rotating shaft 3 , and the water-blocking rubber ring 805 is arranged on the rotating shaft 3 on the first side of the clamping ring 103 .

[0056] Preferably, Figure 4 , Fig. 9 and Fig.10 As shown, the outer rotor motor also includes a rotor shell 801 fixed to the second end of the rotating shaft 3, and a rotor boss 802 is provided on the side of the rotor shell 801 facing the first side, and the surface of the rotor boss 802 facing the first side contacts the end surface of the oil-containing bearing 2.

[0057] By providing the rotor boss 802, the rotor boss 802 and the clamping ring 103 clamp the oil bearing 2 in the middle, thereby limiting the position of the oil bearing 2, improving the installation accuracy of the oil bearing 2, and improving the sealing of the installation of the oil bearing 2. In this way, the stability of the rotating shaft 3 during rotation is improved.

[0058] Preferably, Figure 2 and Figure 4As shown, the bearing chamber 1051 is located on the side of the end cover 1 facing the second side, and a stator assembly 901 is fixed to the outer periphery of the bearing seat 105. The stator assembly 901 includes a rear end portion 902 surrounding the rotor boss 802, and the space between the inner peripheral surface of the rear end portion 902 and the outer peripheral surface of the rotor boss 802 constitutes a second oil storage space 602.

[0059] By setting the second oil storage space 602 between the rear end 902 of the stator assembly 901 and the rotor boss 802, the storage capacity of the lubricating oil is further increased, which is beneficial to increasing the working time of the outer rotor motor. Since the second oil storage space 602 is located at the second end of the oil-containing bearing 2, the lubrication performance of the second end of the oil-containing bearing 2 is improved; by setting the oil storage space at both ends of the oil-containing bearing 2, the lubrication performance of the oil-containing bearing 2 is improved, so that a stable and complete oil film can be formed between the rotating shaft 3 and the oil-containing bearing 2.

[0060] Furthermore, the stator assembly 901 includes a plastic-coated frame 903 , the rear end portion 902 is the plastic-coated frame 903 , and the second oil storage space 602 is between the inner circumference of the plastic-coated frame 903 and the outer circumference of the rotor boss 802 .

[0061] The stator assembly 901 is fixed to the end cover 1 by precision pressing.

[0062] Preferably, Figure 5 As shown, an oil guide groove 201 is provided on the outer peripheral surface of the oil-containing bearing 2 , and the oil guide groove 201 communicates with the first oil storage space 601 and the second oil storage space 602 .

[0063] By setting the oil guide groove 201, when one of the oil storage spaces located at both ends of the oil-containing bearing 2 lacks lubricating oil, the lubricating oil in the other oil storage space can flow into the other oil storage space through the oil guide groove 201, ensuring that both ends of the oil-containing bearing 2 can be fully lubricated and avoiding the oil-containing bearing 2 from lacking oil.

[0064] When injecting lubricating oil during motor assembly, before assembling the first sealing ring 501, inject lubricating oil from the first oil storage space 601, and the lubricating oil enters the second oil storage space 602 through the oil guide groove 201, thereby completing the oil injection work for the outer rotor motor. Since the first oil storage space 601 and the second oil storage space 602 are respectively at the two ends of the oil-containing bearing 2, during the process of injecting lubricating oil, the lubricating oil can fully enter the porous structure of the oil-containing bearing 2 during the process of flowing from the first oil storage space 601 to the second oil storage space 602, thereby improving the lubrication effect of the oil-containing bearing 2 of the outer rotor motor. When the motor needs to be supplemented with lubricating oil after working for a period of time after assembly, it is only necessary to remove the retaining ring 103, move the elastic ring 104, and then move the first sealing ring 501 toward the first side. At this time, the oil injection work can be carried out through the first oil storage space 601, which is very convenient and does not require the outer rotor motor to be disassembled.

[0065] Preferably, Figure 2 and Fig.11 As shown, a second sealing ring 502 is sleeved on the outer periphery of the rotor boss 802 , and the second sealing ring 502 is arranged on a side of the second oil storage space 602 facing the second side.

[0066] The second sealing ring 502 can reduce the amount of lubricating oil flowing out of the second oil storage space 602, thereby improving the lubrication performance of the oil-containing bearing 2. The second sealing ring 502 can reduce or prevent the lubricating oil in the second oil storage space 602 from flowing out of the second oil storage space 602 when the outer rotor motor moves or vibrates. The second sealing ring 502 can be in two forms, such as Figure 2 The cross section of the second sealing ring 502 is circular. Fig.11 , the cross section of the second sealing ring 502 is L-shaped.

[0067] Preferably, Figure 2 and Figure 4 As shown, a plurality of second grooves 702 are provided on the end surface of the bearing seat 105 facing the second side, and the second grooves 702 penetrate the bearing seat 105 along the radial direction.

[0068] By providing the second groove 702, the second groove 702 radially penetrates the bearing seat 105, so that the second groove 702 communicates with the second oil storage space 602 and the outer wall surface of the oil-containing bearing 2. The second groove 702 is provided, on the one hand, the second groove 702 can accelerate the speed at which the lubricating oil in the second oil storage space 602 flows to the oil-containing bearing 2, and on the other hand, the second groove 702 can store the lubricating oil, thereby increasing the amount of lubricating oil stored in the outer rotor motor.

[0069] Furthermore, the size of the second groove 702 in the circumferential direction is between 1 mm and 2 mm. The size of the second groove 702 is relatively small. The second groove 702 has the effect of a capillary. After the lubricating oil contacts the second groove 702, it can move toward the side of the oil-containing bearing 2 under the capillary action. Due to the porous structure of the oil-containing bearing 2 itself, the lubricating oil is further attracted. In this way, the lubricating oil in the second oil storage space 602 can effectively lubricate the oil-containing bearing 2.

[0070] Preferably, Figure 2 and Figure 4 As shown, the stator assembly 901 includes a stator core 904, and an oil absorption gasket 906 surrounding the rotating shaft 3 is provided at one end of the stator core 904 facing the second side. In the axial direction, the oil absorption gasket 906 surrounds the outer side of the second groove 702 and contacts the bearing seat 105.

[0071] The oil absorption gasket 906 can further fix the lubricating oil. Since the oil absorption gasket 906 is in contact with the bearing seat 105, the lubricating oil in the second oil storage space 602 is first contacted by the oil absorption gasket 906 and absorbed and fixed by the oil absorption gasket 906. When the motor moves and vibrates, since the oil absorption gasket 906 is in contact with the bearing seat 105, the lubricating oil stored in the oil absorption gasket 906 can enter the second groove 702 and then be absorbed by the oil-containing bearing 2. Furthermore, the second groove 702 can absorb the lubricating oil from the oil absorption gasket 906 through capillary action, thereby accelerating the flow of the lubricating oil in the second oil storage space 602 to the oil-containing bearing 2. The lubrication performance of the oil-containing bearing 2 is thereby improved.

[0072] When the lubricating oil in the second oil storage space 602 is less, as long as the lubricating oil can be absorbed by the oil absorption gasket 906, the lubricating oil will penetrate and flow along the oil absorption gasket 906, and then the oil absorption gasket 906 absorbs the lubricating oil as a whole. Since the oil absorption gasket 906 surrounds the second groove 702, the lubricating oil on the oil absorption gasket 906 can flow to the second groove 702 in the circumferential direction, and then lubricate the oil-containing bearing 2 in the circumferential direction, thereby improving the lubrication efficiency of the oil-containing bearing 2. The oil absorption gasket 906 is preferably an oil storage felt. The oil storage felt absorbs the lubricating oil and can also increase the oil storage capacity of the outer rotor motor. Furthermore, part of the oil absorption gasket 906 is covered by the plastic coating layer of the stator assembly 901 to fix the oil absorption gasket 906.

[0073] Preferably, Figure 2 , Figure 4 and Figure 7 As shown, a plurality of third grooves 703 extending along the axial direction of the rotating shaft 3 are provided on the inner circumferential surface of the rear end portion 902 .

[0074] A plurality of third grooves 703 are provided at the rear end portion 902. On the one hand, the third grooves 703 can store lubricating oil and increase the oil storage capacity of the second oil storage space 602. On the other hand, the lubricating oil can flow along the third grooves 703 to accelerate the flow of the lubricating oil toward the second groove 702. When an oil-absorbing gasket 906 is provided, one end of the third groove 703 facing the first side is connected to the oil-absorbing gasket 906, and the oil-absorbing gasket 906 can absorb the lubricating oil from the third groove 703, thus further accelerating the flow of the lubricating oil. The flow path of a part of the lubricating oil is: the third groove 703 → the oil-absorbing gasket 906 → the second groove 702 → the oil-containing bearing 2. Furthermore, the width of the third groove 703 in the circumferential direction is between 1 mm and 2 mm. Under the tension of the lubricating oil, the lubricating oil can be stored in the third groove 703 and flow along the third groove 703. When there is less lubricating oil in the second oil storage space 602 (there is lubricating oil only in the third groove 703), the evaporation rate of the lubricating oil in the third groove 703 is slower, thereby slowing down the consumption of lubricating oil, which is beneficial to increasing the service life of the outer rotor motor (adding lubricating oil once increases the service life of the outer rotor motor under certain lubrication performance).

[0075] Preferably, Fig. 9 and Fig.10 As shown, from the second side to the first side, the distance from the bottom surface of the third groove 703 to the axis of the rotating shaft 3 gradually increases.

[0076] The distance from the bottom surface of the third groove 703 to the axis of the rotating shaft 3 gradually increases, which makes the lubricating oil do centrifugal motion under the action of the rotor boss 802 when the rotating shaft 3 rotates under the action of the centrifugal force. When the lubricating oil flows into the second groove 702, it can gradually flow toward the first side along the bottom surface of the third groove 703, thereby accelerating the flow of the lubricating oil to the second groove 702, thereby accelerating the lubrication of the oil-containing bearing 2, and avoiding the lack of lubricating oil. The faster the lubricating oil flows to the oil-containing bearing 2, the better the lubricity of the oil-containing bearing 2, and the rotating shaft 3 can maintain a higher speed. The higher the lubricity of the oil-containing bearing 2, the longer the service life of the oil-containing bearing 2, and the lower the noise during operation.

[0077] Preferably, Figure 4 and Fig.10 As shown, the outer peripheral surface of the rotor boss 802 is provided with a spiral groove 803, and the rotation direction of the spiral groove 803 from the second side to the first side is opposite to the rotation direction of the outer rotor motor in the working state.

[0078] The rotation direction of the spiral groove 803 is opposite to the rotation direction of the outer rotor motor in the working state, so that when the rotor boss 802 rotates, the lubricated oil can not only flow to the third groove 703 under the action of centrifugal force, but also flow toward the first side under the action of the spiral groove 803 (the spiral groove 803 has a guiding effect on the lubricating oil, and the function of the spiral groove 803 is similar to that of a screw conveyor), further accelerating the flow of the lubricating oil to the second groove 702, and then accelerating the flow of the lubricating oil to the oil-containing bearing 2.

[0079] Preferred, preferred, such as Fig.10 As shown, from the second side to the first side, the circumference of the outer peripheral surface of the rotor boss 802 gradually increases.

[0080] When the rotor boss 802 rotates, the circumference of the outer peripheral surface of the rotor boss 802 gradually increases from the second side to the first side, which is conducive to the lubricating oil in the second oil storage space 602 moving toward the oil absorption gasket 906.

[0081] The outer rotor motor is also provided with a control board 804, a permanent magnet 905 and the like.

[0082] The invention provides an air conditioner, comprising the outer rotor motor.

[0083] The outer rotor motor is used in a condenser water circulation system. Furthermore, the outer rotor motor is a brushless DC outer rotor motor.

[0084] The present invention also provides a dehumidifier, comprising the outer rotor motor.

[0085] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0086] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An outer rotor motor, comprising an end cover (1), the end cover (1) being provided with a bearing seat (105), the bearing seat (105) being provided with a bearing chamber (1051), an oil-containing bearing (2) being provided in the bearing chamber (1051), a rotating shaft (3) being provided in the oil-containing bearing (2), the direction in which the rotating shaft (3) extends out of the outer rotor motor being a first side, and the other side opposite to the first side being a second side, characterized in that: One end of the oil-containing bearing (2) facing the first side is a first end, and the other end is a second end. The outer peripheral surface of the oil-containing bearing (2) within a preset distance from the end surface of the first end to the second end is a first oil storage surface (401). A first sealing ring (501) is sleeved on the rotating shaft (3). The first oil storage surface (401), the inner surface of the bearing chamber (1051) and the space surrounded by the first sealing ring (501) constitute a first oil storage space (601).

2. The outer rotor motor according to claim 1, characterized in that: The first oil storage surface (401) is a conical surface, and the end of the conical surface facing the first end is a small end.

3. The outer rotor motor according to claim 2, characterized in that: The inner wall surface of the bearing chamber (1051) covering the first oil storage space (601) is a second oil storage surface (402), and an annular protrusion (101) surrounding the oil-containing bearing (2) is provided at one end of the second oil storage surface (402) close to the first side, and the inner circumferential surface of the annular protrusion (101) is in contact with the conical surface at one end close to the second side.

4. The outer rotor motor according to claim 3, characterized in that: The inner circumferential surface of the annular protrusion (101) is provided with a plurality of first grooves (701) extending along the axial direction of the rotating shaft (3), and the first grooves (701) penetrate the annular protrusion (101).

5. The outer rotor motor according to claim 1, characterized in that: The rotating shaft (3) is provided with a clamping groove (102), a clamping ring (103) is sleeved in the clamping groove (102), the clamping ring (103) is located on the side of the first sealing ring (501) facing the first side, the first sealing ring (501) is in contact with the end surface of the first end of the oil-containing bearing (2), and an elastic ring (104) is sleeved on the rotating shaft (3) between the clamping ring (103) and the first sealing ring (501), and the elastic ring (104) is in an extruded state.

6. The outer rotor motor according to any one of claims 1 to 5, characterized in that: The outer rotor motor further comprises a rotor shell (801) fixed to the second end of the rotating shaft (3); a rotor boss (802) is provided on the side of the rotor shell (801) facing the first side; and a surface of the rotor boss (802) facing the first side contacts an end surface of the oil-containing bearing (2).

7. The outer rotor motor according to claim 6, characterized in that: The bearing chamber (1051) is located on the side of the end cover (1) facing the second side, and a stator assembly (901) is fixed to the outer periphery of the bearing seat (105). The stator assembly (901) includes a rear end portion (902) surrounding the rotor boss (802), and the space between the inner peripheral surface of the rear end portion (902) and the outer peripheral surface of the rotor boss (802) constitutes a second oil storage space (602).

8. The outer rotor motor according to claim 7, characterized in that: An oil guide groove (201) is provided on the outer peripheral surface of the oil-containing bearing (2), and the oil guide groove (201) is connected to the first oil storage space (601) and the second oil storage space (602).

9. The outer rotor motor according to claim 7, characterized in that: A second sealing ring (502) is sleeved on the outer periphery of the rotor boss (802), and the second sealing ring (502) is arranged on a side of the second oil storage space (602) facing the second side.

10. The outer rotor motor according to claim 7, characterized in that: A plurality of second grooves (702) are provided on the end surface of the bearing seat (105) facing the second side, and the second grooves (702) penetrate the bearing seat (105) along the radial direction.

11. The outer rotor motor according to claim 10, characterized in that: The stator assembly (901) comprises a stator core (904), and an oil absorption gasket (906) surrounding the rotating shaft (3) is provided at one end of the stator core (904) facing the second side. In the axial direction, the oil absorption gasket (906) surrounds the outer side of the second groove (702) and contacts the bearing seat (105).

12. The outer rotor motor according to claim 10, characterized in that: A plurality of third grooves (703) extending along the axial direction of the rotating shaft (3) are arranged on the inner circumferential surface of the rear end portion (902).

13. The outer rotor motor according to claim 12, characterized in that: In the direction from the second side to the first side, the distance from the bottom surface of the third groove (703) to the axis of the rotating shaft (3) gradually increases.

14. The outer rotor motor according to claim 7, characterized in that: The outer peripheral surface of the rotor boss (802) is provided with a spiral groove (803), and in the direction from the second side to the first side, the rotation direction of the spiral groove (803) is opposite to the rotation direction of the outer rotor motor in the working state.

15. The outer rotor motor according to any one of claims 7 to 14, characterized in that: In a direction from the second side to the first side, the circumference of the outer peripheral surface of the rotor boss (802) gradually increases.

16. An air conditioner, characterized in that: An outer rotor motor comprising the one described in any one of claims 1-15.

17. A dehumidifier, characterized in that: An outer rotor motor comprising the one described in any one of claims 1-15.

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