Vertical external rotor motor and power plant air-cooling and air-cooling driving unit

Abstract

The utility model relates to the technical field of external rotor motors, in particular to a vertical external rotor motor and a power plant air-cooling and air-cooling driving unit, comprising a stator, a rotor and a bearing assembly which are coaxial, and the rotor is rotatably connected outside the stator through the bearing assembly; the bearing assembly comprises a bearing, a lower sealing assembly and an outer hub; the lower sealing assembly comprises an outer ring lower cover, an inner ring lower cover and a bottom cover which are coaxial; the outer ring lower cover and the inner ring lower cover are coaxially connected in a sleeved mode and are in clearance fit, the outer ring lower cover is fixed to the outer hub, the inner ring lower cover and the bottom cover are both fixed to the stator, and the outer ring lower cover, the inner ring lower cover and the bottom cover define a waste grease box. The outer rotor motor has the beneficial effects that redundant grease for lubricating the bearing can flow into the waste grease box through the gap between the outer ring lower cover and the inner ring lower cover, so that the operation resistance of the bearing assembly can be reduced, the overall energy consumption of the outer rotor motor can be reduced, and the working temperature of the bearing assembly can be kept in a suitable range.

Description

Technical Field

[0001] The utility model relates to the technical field of outer rotor motors, in particular to a vertical outer rotor motor and an air-cooling and air-cooling drive unit for a power plant. Background Art

[0002] Air-cooling fans condense turbine exhaust gases and maintain condenser vacuum. Each power plant unit is equipped with dozens of air-cooling fans. Due to their advantages of water conservation and reduced footprint, air-cooling units are increasingly used in new power plants in northern my country. However, since asynchronous motors in air-cooling fans often have high noise levels, poor reliability, high vibration wear, high heat loss, high damage rates, and high maintenance and repair costs, using them as external rotor motors can partially overcome these issues.

[0003] Traditional external rotor motors consist of a coaxial stator, rotor, and bearing assembly. The rotor is connected to the stator through the bearing assembly for rotation. The bearings are often assembled in a sealed space and sealed with grease. During the bearing assembly phase, excessive grease is often added to ensure adequate lubrication of the bearings. Excessive grease churns violently within the bearing cavity, increasing resistance to bearing rotation, raising temperatures and energy consumption. Increased temperatures accelerate the oxidation of the grease, causing premature deterioration and shortening its service life. Increased temperatures also accelerate the precipitation of the base oil in the grease, causing the remaining thickener to dry and solidify, preventing the newly added grease from fully flowing into the bearing, resulting in poor lubrication and increased bearing wear. Overfilling can also increase seal pressure, leading to seal rupture and failure, resulting in a loose seal, the introduction of impurities, and leakage, which can damage the bearing. Utility Model Content

[0004] (1) Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a vertical outer rotor motor, which solves the technical problems in the prior art caused by excessive grease in the bearing assembly cavity, such as increased temperature and energy consumption, increased bearing wear and easy seal failure.

[0006] (2) Technical solution

[0007] In order to achieve the above-mentioned purpose, the main technical solutions adopted by this utility model include:

[0008] In the first aspect, the utility model provides a vertical outer rotor motor, comprising a coaxial stator, a rotor and a bearing assembly, wherein the rotor is rotatably connected to the outside of the stator through the bearing assembly; the bearing assembly comprises a bearing, a lower sealing assembly and an outer hub; the outer hub is fixed to the axial end of the rotor; the bearing is located between the outer hub and the stator, and the lower sealing assembly is located at the axial lower end of the bearing; the lower sealing assembly comprises a coaxial outer ring lower cover, an inner ring lower cover and a bottom cover; the outer ring lower cover and the inner ring lower cover are coaxially sleeved and clearance-fitted, the outer ring lower cover is fixed on the outer hub, the inner ring lower cover and the bottom cover are both fixed on the stator, and the outer ring lower cover, the inner ring lower cover and the bottom cover are enclosed to form a waste grease box.

[0009] In the second aspect, the utility model provides an air-cooled drive unit for a power plant, including the vertical outer rotor motor in the above technical solution, and also including a frame and a plurality of blades. The blades are evenly distributed circumferentially and fixed on the outer hub corresponding to the lower bearing assembly, and the stator is fixed on the frame.

[0010] (3) Beneficial effects

[0011] The beneficial effects of the present invention are as follows: in the vertical outer rotor motor and power plant air-cooled drive unit of the present invention, the upper seal assembly, the lower seal assembly, the stator, and the outer hub enclose a space for assembling and lubricating the bearing. Excess grease from the bearing lubrication can flow into the waste grease box through the gap between the outer ring lower cover and the inner ring lower cover by gravity, thereby achieving the collection of excess grease. This ensures that the bearing maintains an appropriate volume of grease for a long period of time during operation, which helps reduce the operating resistance of the bearing assembly, thereby reducing the overall energy consumption of the outer rotor motor and helping to maintain the operating temperature of the bearing assembly within an appropriate range.

[0012] Precisely because excess grease can be discharged, there is no large pressure difference between the bearing assembly space and the external environment, so the grease is less likely to leak, ensuring the reliability of the bearing assembly and the reliability of the outer rotor motor.

[0013] When the vertical outer rotor motor is applied to the air-cooled drive unit of a power plant, it can also operate efficiently and reliably, thereby improving the cooling efficiency of the air-cooled equipment of the power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the vertical outer rotor motor, upper flange and lower flange of the utility model;

[0015] Figure 2 This is a structural diagram of the position of the upper bearing assembly of the vertical outer rotor motor of the utility model;

[0016] Figure 3 This is a structural diagram of the position of the lower bearing assembly of the vertical outer rotor motor of the utility model;

[0017] Figure 4 This is a schematic diagram of the main structure of the air-cooled drive unit for a power plant according to the present invention;

[0018] Figure 5 This is a bottom view structural diagram of the air-cooled drive unit for a power plant according to the present invention.

[0019] [Description of Reference Numerals]

[0020] 1. Stator;

[0021] 2. Rotor;

[0022] 3. Bearing assembly;

[0023] 31. Bearings;

[0024] 32. Lower sealing assembly;

[0025] 321, outer ring lower cover; 3210, first annular groove;

[0026] 322, inner ring lower cover;

[0027] 323, bottom cover; 3230, first annular protrusion;

[0028] 33. Upper sealing assembly;

[0029] 331, upper cover; 3310, second annular protrusion;

[0030] 332, top cover; 3320, second annular groove;

[0031] 34. Outer hub;

[0032] 4. Collection box;

[0033] 5. Leaves;

[0034] 6. Upper flange;

[0035] 7. Lower flange. DETAILED DESCRIPTION

[0036] In order to better explain the present invention, and to facilitate understanding, the following Figure 1-Figure 5 , through the specific implementation method, the utility model is described in detail. Among them, the directional nouns such as "upper" and "lower" mentioned in this article are Figure 1 The orientation is referenced.

[0037] Example 1:

[0038] Reference Figure 1-Figure 5An embodiment of the present utility model provides a vertical outer rotor motor, comprising a coaxial stator 1, a rotor 2 and a bearing assembly 3, wherein the rotor 2 is rotatably connected to the outside of the stator 1 through the bearing assembly 3; the bearing assembly 3 comprises a bearing 31, an upper sealing assembly 33, a lower sealing assembly 32 and an outer hub 34; the outer hub 34 is fixed to the axial end of the rotor 2; the bearing 31 is located between the outer hub 34 and the stator 1, and the upper sealing assembly 33 and the lower sealing assembly 32 are respectively located at the axial upper and lower ends of the bearing 31; the lower sealing assembly 32 comprises an outer ring lower cover 321, an inner ring lower cover 322 and a bottom cover 323, the outer ring lower cover 321 and the inner ring lower cover 322 are coaxially sleeved and clearance-fitted, and the clearance forms a discharge channel for excess grease. The outer ring lower cover 321 is fixed on the outer hub 34, the inner ring lower cover 322 and the bottom cover 323 are both fixed on the stator 1, and the outer ring lower cover 321, the inner ring lower cover 322 and the bottom cover 323 are enclosed to form a waste grease box.

[0039] In this embodiment, the upper sealing assembly 33, the lower sealing assembly 32, the stator 1, and the outer hub 34 enclose a space for assembling and lubricating the bearing 31. Excess grease from the lubrication of the bearing 31 can flow into the waste grease box through the gap between the outer ring lower cover 321 and the inner ring lower cover 322, thereby collecting the excess grease and ensuring that the bearing 31 maintains an appropriate volume of grease for a long period of time during operation. This helps reduce the operating resistance of the bearing assembly 3, thereby reducing the overall energy consumption of the outer rotor motor and helping to maintain the operating temperature of the bearing assembly 3 within an appropriate range.

[0040] Precisely because excess grease can be discharged, there is no large pressure difference between the assembly space of the bearing 31 and the external environment, so the grease is less likely to leak, ensuring the reliability of the bearing assembly 3 and the reliability of the external rotor motor.

[0041] The bearing assemblies 3 are provided in two groups and are located at the axial upper side and the axial lower side of the stator 1 and the rotor 2 to ensure the balance of the motor operation.

[0042] Furthermore, the clearance fit position of the inner ring lower cover 322 and the outer ring lower cover 321 should be projected vertically inside the waste grease box to prevent the overflowed grease from leaking out accidentally.

[0043] Example 2:

[0044] Reference Figure 1-Figure 5 In addition to all the technical solutions of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0045] It also includes a collecting box 4 fixed on the inner wall of the stator 1. An overflow port is opened on the side wall of the stator 1. The two ends of the overflow port are connected to the waste grease box and the collecting box 4 respectively. The top of the collecting box 4 is open.

[0046] In this embodiment, the collection box 4 is fixed to the inner wall of the stator 1 to receive grease that overflows from the waste grease box. When the grease in the waste grease box accumulates to a certain level, the excess grease flows into the collection box 4 through the overflow port. This design ensures the continuous collection and treatment of grease and avoids the risk of grease overflow or leakage.

[0047] The top of the collecting box 4 is designed to be open, so as to facilitate inspection and cleaning of the grease in the collecting box 4. When the grease in the collecting box 4 accumulates to a certain extent, the operator can easily open the collecting box 4 and clean out the grease therein, thereby maintaining the good operating condition of the motor.

[0048] The introduction of collection box 4 and the provision of an overflow port comprehensively optimize the motor's grease management system. The waste grease box initially collects excess grease, while collection box 4 serves as a secondary collection device, ensuring that grease does not leak outside the motor. Furthermore, the open design of collection box 4 facilitates maintenance and cleaning, further enhancing the motor's reliability and service life. This not only improves grease collection efficiency but also reduces the risk of grease leakage, providing a strong guarantee for stable motor operation.

[0049] Example 3:

[0050] Reference Figure 1-Figure 5 In addition to all the technical solutions of any of the above embodiments, the embodiments of the present invention further have the following technical solutions:

[0051] The bearing assembly 3 also includes an upper sealing assembly 33 provided at the axial upper end of the bearing 21. The upper sealing assembly 33 includes an upper cover 331 and a top cover 332. One radial end of the upper cover 331 is fixed to the outer hub 34, one radial end of the top cover 332 is fixed to the stator 1, and the other radial end of the upper cover 331 is clearance-fitted with the top cover 332.

[0052] A first annular protrusion 3230 and a first annular groove 3210 that fit together with a clearance are formed on the opposing surfaces of the bottom cover 323 and the outer ring lower cover 321 respectively, and a second annular groove 3320 and a second annular protrusion 3310 that fit together with a clearance are provided on the opposing surfaces of the bottom cover 323 and the outer ring lower cover 321 respectively.

[0053] The first annular groove 3210 and the first annular protrusion 3230 , and the second annular groove 3320 and the second annular protrusion 3310 are respectively provided as one group or multiple coaxial groups.

[0054] The top cover 332 and the upper cover 331 cooperate to realize the movable sealing of the upper cover 331 assembly on the upper side of the bearing 31, so as to ensure the sealing ability of the upper sealing assembly 33 on the bearing assembly space.

[0055] A first annular protrusion 3230 and a first annular groove 3210 that fit with each other in a clearance are respectively formed on the relative surfaces of the bottom cover 323 and the outer ring lower cover 321, forming a first labyrinth sealing area, thereby ensuring a rotational sealing effect between the two, thereby effectively avoiding the problem of grease leakage, ensuring the reliability of the bearing assembly 3, and also ensuring the reliability of the outer rotor motor.

[0056] The second annular groove 3320 and the second annular protrusion 3310 cooperate with each other to form a second labyrinth sealing area, which can further improve the sealing effect of the upper sealing assembly 33.

[0057] Specifically, in this embodiment, a step surface is provided on the stator 1, which can provide positioning for the assembly of the upper sealing component 33 and the lower sealing component 32. The axial position of the bearing assembly 3 can be limited by the pressure ring fixedly connected to the stator 1 above the upper sealing component 33. For details, refer to Figure 2 That is, the bottom cover 323, the inner ring lower cover 322, the inner ring of the bearing 31 and the top cover 332 are axially abutted, and the outer ring lower cover 321, the outer ring of the bearing 31 and the top cover 331 are axially abutted to ensure the stability and reliability of the bearing assembly 3 after assembly.

[0058] In the above-mentioned clearance fit relationship, when the motor is large in size and is used for an air-cooled drive unit in a power plant, the clearance can be about 0.5mm-2mm. Since the assembly space of the bearing 31 does not generate high pressure, the clearance can meet the sealing requirements.

[0059] The first annular groove 3210 and the first annular protrusion 3230, as well as the second annular groove 3320 and the second annular protrusion 3310 are respectively set as one group or multiple coaxial groups. When set as multiple groups, a multi-level sealing structure can be formed, thereby further improving the sealing effect.

[0060] Example 4:

[0061] Figure 1-Figure 5 In addition to providing a power plant air-cooled drive unit, embodiments of the present invention include the vertical outer rotor motor described in any of the aforementioned embodiments, a frame and a plurality of blades 5. The blades 5 are evenly distributed circumferentially and fixed to the outer hub 34 corresponding to the lower bearing assembly 3. The stator 1 is fixed to the frame. When this vertical outer rotor motor is used in a power plant air-cooled drive unit, it can also operate efficiently and reliably, thereby improving the cooling efficiency of the power plant's air-cooled equipment.

[0062] It also includes an upper flange 6 and a lower flange 7. The upper flange 6 is fixed on the outer hub 34 corresponding to the upper bearing assembly 3, and the lower flange 7 is fixed on the outer hub 34 corresponding to the lower bearing assembly 3. The upper flange 6 is connected to the frame, and the lower flange 7 is connected to the blade 5.

[0063] In this embodiment, the vertical outer rotor motor offers advantages such as simple structure, energy conservation, low maintenance costs, environmental friendliness, and low noise. Its rotating body is located within the outer casing, embedded with multiple pairs of permanent magnets. This increased number of magnetic pole pairs enables low-speed, high-torque direct drive. This design not only improves energy utilization but also reduces losses in the system's multi-stage transmission, significantly reducing energy consumption.

[0064] As a key component supporting and securing the motor, the rack's stability and strength are crucial. The rack is typically made of high-strength, corrosion-resistant materials to ensure long-term operation without deformation or damage that could affect the motor's performance. The rack can be an air-cooling tower, with the upper flange 6 connected to the top of the tower.

[0065] The blades 5 are evenly distributed circumferentially and fixed to the outer hub 34 corresponding to the lower bearing assembly 3. Parameters such as the number, shape, and material of the blades 5 directly affect the heat dissipation and performance of the air cooling system. Therefore, during design, appropriate selection and optimization are required based on the specific usage environment and requirements.

[0066] The upper flange 6 is fixed to the outer hub 34 corresponding to the upper bearing assembly 3 and connected to the frame. The upper flange 6 primarily secures and supports the motor while ensuring a tight and reliable connection between the motor and the frame. High-strength bolts or welding can be used to connect the upper flange 6 to the frame to ensure stability and durability.

[0067] Lower flange 7 is fixed to outer hub 34 corresponding to lower bearing assembly 3 and connected to blade 5. Its primary function is to secure blade 5, preventing it from falling off or loosening during rotation. It also transmits torque and supports the weight of blade 5.

[0068] The power plant's air-cooled drive unit uses a vertical external rotor motor to rotate blades 5, generating wind power to cool the air-cooling system's condenser. The fixed connection between upper flange 6 and lower flange 7 ensures the stability and reliability of the motor and blades 5. Furthermore, the frame, acting as a supporting component, provides solid support and anchoring for the entire drive unit.

[0069] Furthermore, the bearings 31 corresponding to the upper bearing assembly 3 are configured as a pair of back-to-back angular contact ball bearings, and the bearings 31 corresponding to the lower bearing assembly 3 are configured as cylindrical bearings.

[0070] The back-to-back angular contact ball bearings are characterized in that the inner and outer rings of the two bearings 31 can be installed opposite to each other, and their contact angles are the same but in opposite directions.

[0071] The back-to-back angular contact ball bearings can withstand larger radial and axial loads, and because the contact angles of the two bearings 31 are in opposite directions, they can offset each other's axial forces, thereby providing better axial positioning capability.

[0072] In a power plant's air-cooled drive unit, the upper bearing assembly 3 must withstand axial and radial loads from the motor rotor 2. Furthermore, the upper stator 1 is connected to the frame via the upper flange 6, so the upper bearing 31 carries a greater axial load. Therefore, back-to-back angular contact ball bearings are used to meet these requirements and ensure stable motor operation.

[0073] Cylindrical bearings offer advantages such as simple structure, ease of maintenance, and high radial load capacity. Because the blades 5 are connected to the underside of the rotor 2, radial vibrations generated by the blades 5 during operation are more easily transmitted to the bearing assembly 3 below. Using a cylindrical bearing as this bearing 31 can better meet load requirements and reduce the cost of the bearing assembly 3.

[0074] By utilizing different types of bearings 31 to meet varying operational requirements, the power plant's air-cooled drive unit achieves more precise and efficient operation. The upper bearing assembly 3 utilizes back-to-back angular contact ball bearings, ensuring axial positioning and stable operation of the motor. The lower bearing assembly 3 utilizes cylindrical bearings, meeting the need to withstand greater radial loads. This design not only improves the overall performance of the drive unit but also extends its service life.

[0075] It can be understood that, except for any conflicting parts, the above-mentioned embodiments 1-4 can be freely combined to form other implementation methods of the present invention.

[0076] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0077] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0078] In the present invention, unless otherwise expressly specified or limited, when a first feature is “above” or “below” a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed or inherent to such process, article, or apparatus / device.

[0080] Thus far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present invention.

Claims

1. A vertical outer rotor motor, characterized in that: It comprises a coaxial stator (1), a rotor (2) and a bearing assembly (3); The bearing assembly (3) comprises a bearing (31), a lower sealing assembly (32) and an outer hub (34); the outer hub (34) is fixed to an axial end of the rotor (2); the bearing (31) is located between the outer hub (34) and the stator (1), and the lower sealing assembly (32) is located at the axial lower end of the bearing (31); The lower sealing assembly (32) includes a coaxial outer ring lower cover (321), an inner ring lower cover (322) and a bottom cover (323); the outer ring lower cover (321) and the inner ring lower cover (322) are coaxially sleeved and clearance-fitted, the outer ring lower cover (321) is fixed on the outer hub (34), and the inner ring lower cover (322) and the bottom cover (323) are both fixed on the stator (1); The outer ring lower cover (321), the inner ring lower cover (322) and the bottom cover (323) are enclosed to form a waste grease box, and the inlet of the waste grease box is the gap between the outer ring lower cover (321) and the inner ring lower cover (322).

2. The vertical outer rotor motor according to claim 1, wherein: It also includes a collection box (4) fixed on the inner wall of the stator (1), an overflow port is provided on the side wall of the stator (1), and both ends of the overflow port are connected to the waste grease box and the collection box (4) respectively; The top of the collecting box (4) is open.

3. The vertical outer rotor motor according to claim 1, wherein: The bearing assembly (3) further includes an upper sealing assembly (33) provided at the axial upper end of the bearing (31), the upper sealing assembly (33) including an upper cover (331) and a top cover (332), one radial end of the upper cover (331) being fixed to the outer hub (34), one radial end of the top cover (332) being fixed to the stator (1), and the other radial end of the upper cover (331) being clearance-matched with the top cover (332); the opposing surfaces of the bottom cover (323) and the outer ring lower cover (321) being matched with each other to form a first labyrinth sealing area, and the opposing surfaces of the top cover (332) and the upper cover (331) being matched with each other to form a second labyrinth sealing area.

4. The vertical outer rotor motor according to claim 3, wherein: A first annular protrusion (3230) and a first annular groove (3210) are respectively formed on the opposing surfaces of the bottom cover (323) and the outer ring lower cover (321), and a second annular groove (3320) and a second annular protrusion (3310) are respectively provided on the opposing surfaces of the bottom cover (323) and the outer ring lower cover (321). The first annular groove (3210) and the first annular protrusion (3230), as well as the second annular groove (3320) and the second annular protrusion (3310) are respectively provided as a group or multiple coaxial groups; The gaps between the first annular groove (3210) and the first annular protrusion (3230), between the second annular groove (3320) and the second annular protrusion (3310), and between the outer ring lower cover (321) and the inner ring lower cover (322) are all 0.5mm-2mm.

5. The vertical outer rotor motor according to claim 4, characterized in that: The bottom cover (323), the inner ring lower cover (322), the inner ring of the bearing (31) and the top cover (332) are axially abutted, and the outer ring lower cover (321), the outer ring of the bearing (31) and the top cover (331) are axially abutted.

6. The vertical outer rotor motor according to any one of claims 1 to 5, characterized in that: The bearing assemblies (3) are provided in two groups and are located on the axial upper side and the axial lower side of the stator (1) and the rotor (2).

7. An air-cooled drive unit for a power plant, characterized by: The vertical outer rotor motor according to claim 6 further comprises a frame and a plurality of blades (5), wherein the blades (5) are evenly distributed circumferentially and fixed on the outer hub (34) corresponding to the lower bearing assembly (3), and the stator (1) is fixed on the frame.

8. The air-cooled drive unit for a power plant according to claim 7, characterized in that: The bearings (31) corresponding to the upper bearing assembly (3) are configured as a pair of back-to-back angular contact ball bearings, and the bearings (31) corresponding to the lower bearing assembly (3) are configured as cylindrical bearings.

9. The air-cooled drive unit for a power plant according to claim 7 or 8, characterized in that: It also includes an upper flange (6) and a lower flange (7), wherein the upper flange (6) is fixed on the outer hub (34) corresponding to the upper bearing assembly (3), and the lower flange (7) is fixed on the outer hub (34) corresponding to the lower bearing assembly (3), the upper flange (6) is connected to the frame, and the lower flange (7) is connected to the blade (5).

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