Power assembly and industrial fan with same
By employing a high-speed permanent magnet synchronous motor and a multi-stage planetary gear reducer in the industrial fan, combined with a high reduction ratio reducer, the speed and torque are optimized, solving the problems of low powertrain efficiency and heavy weight, and achieving efficient and stable low-speed operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2026-03-20
AI Technical Summary
Existing industrial fan power assemblies are inefficient, heavy, and have unstable output.
It adopts a high-speed permanent magnet synchronous motor and a multi-stage planetary gear reducer, combined with a high reduction ratio reducer. The speed and torque are optimized through a first-stage planetary gear reducer and a second-stage planetary gear reducer, reducing friction and power loss. Small-diameter bearings and a shrinking reduction housing are used to reduce frictional resistance.
It improves the efficiency of the powertrain, reduces weight and vibration noise, and ensures smooth and efficient operation at the output end.
Smart Images
Figure CN224017420U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of industrial fan, in particular to a power assembly and an industrial fan with the same. BACKGROUND
[0002] Industrial fan generally needs to maintain the wind speed in 1-5m / s, the wind speed in this range can effectively circulate air, achieve the purpose of cooling and ventilation, and can also avoid causing discomfort or safety problems.
[0003] For the case of constant fan size, the motor and reducer of the industrial fan are the decisive factors of the wind speed. The following methods are mainly used in the prior art to achieve low speed output: using a direct drive motor to directly output low speed, or using an asynchronous motor plus a parallel shaft reducer as a power assembly. The direct drive low speed motor generates a lot of heat and has low energy efficiency. For the scheme of asynchronous motor plus parallel shaft reducer, in the application of industrial fan, a 4-pole asynchronous motor is usually used, and its output speed is generally 1500r / min or 1800r / min. By controlling the lower output speed of the motor and combining the parallel shaft reducer, the final output lower speed target is obtained. However, the overall efficiency of this combined power assembly is generally lower than 85%.
[0004] Therefore, the existing technology has the problem of low efficiency in realizing the low speed rotation of the industrial fan. CONTENT OF THE INVENTION
[0005] An object of the present application is to provide a power assembly with high efficiency and an industrial fan with the same.
[0006] Another object of the present application is to reduce the weight of the power assembly.
[0007] A further object of the present application is to improve the stability of the output end of the power assembly.
[0008] In particular, the present application provides a power assembly for an industrial fan, comprising:
[0009] a driving motor, the output speed of which is any value in the range of 3000r / min-6000r / min;
[0010] a reducer, the input end of which is connected to the output end of the driving motor, the speed reduction ratio of the reducer being any value in the range of 55-85, the reducer comprising a multi-stage reduction mechanism and a reduction housing, the output end of the multi-stage reduction mechanism being used to connect a fan blade, the multi-stage reduction mechanism comprising a plurality of connected sub-reduction mechanisms, the connection structure of each sub-reduction mechanism being aligned with the output shaft of the driving motor, and the reduction housing being configured in a contracted shape that is adapted to the connection structure of each sub-reduction mechanism.
[0011] Further, the driving motor is a permanent magnet synchronous motor.
[0012] Further, the multi-stage reduction mechanism is a multi-stage planetary gear reduction mechanism.
[0013] Further, the multi-stage reduction mechanism comprises a first-stage planetary gear reduction mechanism and a second-stage planetary gear reduction mechanism connected in series, the reduction ratio of the first-stage planetary gear reduction mechanism being greater than that of the second-stage planetary gear reduction mechanism.
[0014] Further, the reduction ratio of the first-stage planetary gear reduction mechanism is any value in the range of 8-11, and the reduction ratio of the second-stage planetary gear reduction mechanism is any value in the range of 7-10.
[0015] Further, each planetary gear reduction mechanism has a central shaft as an input end, a ring gear fixed, and a planet carrier as an output end.
[0016] Further, the output end of the multi-stage reduction mechanism is an extended rotating shaft extending from one end of the reduction housing.
[0017] The power assembly further comprises a fan blade connecting structure, which comprises:
[0018] an output flange fixedly connected with the extended rotating shaft, the upper end surface of the output flange being formed with a sink;
[0019] a fan blade connecting ring, the middle part of which is provided with a mounting hole and is mounted at the sink through the mounting hole, and the peripheral side of the fan blade connecting ring is used for connecting a plurality of fan blades.
[0020] Further, the output flange is rotationally connected with the extended rotating shaft through a spline.
[0021] Two elastic retaining rings are fixedly arranged at the extended rotating shaft, respectively at the two ends in the axial direction of the output flange, for limiting the axial displacement of the output flange.
[0022] Further, a flange gasket is fixedly arranged at the bottom of the extended rotating shaft, and the top of the flange gasket is used for supporting the output flange.
[0023] In particular, the utility model further provides an industrial fan, which comprises a plurality of fan blades and the power assembly of any one of the above.
[0024] According to the first aspect of the utility model, high speed drive motor is used in power assembly, and high reduction ratio reducer is added, so that high rotating speed of drive motor is converted into large torque required by industrial fan, ensure that industrial fan can still effectively run under low speed, drive motor with high rotating speed usually has high efficiency, so that the combination of rotating speed and reduction ratio is favorable to improve efficiency of power assembly. Further, the shape of reduction shell of reducer is set as contraction shape matched with output end of each sub-reduction mechanism, which can reduce volume and weight of reduction shell, and can also match outer diameter of small diameter bearing, which is favorable to reduce friction resistance and improve transmission efficiency of power assembly.
[0025] According to the second aspect of the utility model, high speed permanent magnet synchronous motor and multi-stage planetary gear reducer are used, permanent magnet synchronous motor has no rotor copper loss because rotor has no winding, which greatly reduces loss, and general efficiency can reach 90%-97% or even higher, and the efficiency of planetary gear reducer is generally above 95%, so that the efficiency of overall power mechanism can be greatly improved.
[0026] Further, by selecting each planetary gear reducer mechanism as input end, gear ring fixed, planetary carrier as output end, it is favorable to realize large reduction ratio, and the weight of planetary carrier output is small, especially the rotational inertia is much smaller, and the oil stirring damage is also smaller, so that the efficiency is higher.
[0027] Further, by setting the reduction ratio of the first-stage planetary gear reducer mechanism to be greater than the reduction ratio of the second-stage planetary gear reducer mechanism, the large rotating speed of the drive motor is first rapidly reduced through the first-stage planetary gear reducer mechanism, so as to reduce the high load work of the second-stage planetary gear reducer mechanism, thereby optimizing the working state of each reduction mechanism and reducing the friction and power loss of the overall system. And since the second-stage planetary gear reducer mechanism processes lower input speed and torque, the vibration and noise can be reduced, and the stability of the power assembly output end is improved. BRIEF DESCRIPTION OF DRAWINGS
[0028] Figure 1 A structure schematic diagram of a power assembly according to an embodiment of the utility model is shown;
[0029] Figure 2 A structure schematic diagram of an industrial fan according to an embodiment of the utility model is shown;
[0030] Figure 3 A sectional structure schematic diagram of a power assembly according to an embodiment of the utility model is shown;
[0031] Figure 4 An exploded schematic diagram of a fan blade connecting structure and an extended rotating shaft according to an embodiment of the utility model is shown;
[0032] Reference signs:
[0033] 100 - power assembly, 10 - drive motor, 20 - speed reducer, 21 - speed reducer housing, 221 - first housing, 212 - second housing, 22 - first stage planetary gear reduction mechanism, 221 - first central shaft, 222 - first sun gear, 223 - first planetary carrier, 224 - first planetary gear, 225 - first ring gear, 226 - first bearing, 23 - second stage planetary gear reduction mechanism, 231 - second central shaft, 232 - second sun gear, 233 - second planetary carrier, 234 - second planetary gear, 235 - second ring gear, 236 - second bearing, 24 - extended rotating shaft, 30 - fan connecting structure, 31 - output flange, 311 - counterbore, 312 - counterbore, 32 - fan connecting ring, 321 - mounting hole, 33 - elastic retainer, 34 - flange gasket, 35 - fastener, 200 - fan blade, 300 - suspension connecting member. DETAILED DESCRIPTION
[0034] In order to make the above objectives, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings, but not all the structures. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0035] The terms "comprising" and "having" and any variations thereof in the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps is not limited to the listed steps, but can optionally further comprise steps not listed, or can optionally further comprise other steps inherent to the process, method, product or device.
[0036] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.
[0037] Figure 1 A structural schematic diagram of a power assembly 100 according to an embodiment of the present application is shown. Figure 2 A structural schematic diagram of an industrial fan according to an embodiment of the present application is shown. Figure 3A cross-sectional schematic diagram of a powertrain 100 according to an embodiment of the present invention is shown. This embodiment provides a powertrain 100 for an industrial fan, such as... Figure 2 As shown, the powertrain 100 has a suspension connector 300 on its upper part and multiple fan blades 200 on its lower part. Figure 1 As shown, the powertrain 100 includes a drive motor 10 and a reducer 20. The output speed of the drive motor 10 is any value between 3000 r / min and 6000 r / min, such as 3000 r / min, 3500 r / min, 3600 r / min, 4000 r / min, 4500 r / min, 5000 r / min, or 6000 r / min, or any other value between 3000 r / min and 6000 r / min, which is not limited here. The input terminal of the reducer 20 is connected to the output terminal of the drive motor 10, and the reduction ratio of the reducer 20 is any value between 55 and 85, such as 55, 60, 65, 70, 75, 80, or 85, or any other value between 55 and 85, which is not limited here. The reducer 20 includes a multi-stage reduction mechanism and a reduction housing 21. The output end of the multi-stage reduction mechanism is used to connect to the fan blade 200. The multi-stage reduction mechanism includes multiple interconnected sub-reduction mechanisms. The connection structure of each sub-reduction mechanism is aligned with the output shaft of the drive motor 10, and the reduction housing 21 is configured in a retractable shape to adapt to the connection structure of each sub-reduction mechanism. Here, the connection structure of each sub-reduction mechanism can be the output end of the previous sub-reduction mechanism or the input end of the next sub-reduction mechanism. Whether it is the output end of the previous sub-reduction mechanism or the input end of the next sub-reduction mechanism, it is a rotational transmission component, so it needs to be mounted on the reduction housing 21 by bearings. The reduction housing 21 is set in a retractable shape at the connection structure of each sub-reduction mechanism (see...). Figure 3 (At point A in the diagram), it is convenient to use a smaller diameter bearing for support in the connection structure. The smaller the diameter of the bearing, the lower the frictional resistance, thus improving the transmission efficiency of the powertrain 100.
[0038] The powertrain 100 in this embodiment employs a high-speed drive motor 10 and a high-reduction-ratio reducer 20, converting the high speed of the drive motor 10 into the larger torque required by the industrial fan. This ensures that the industrial fan can still operate effectively at low speeds. The high-speed drive motor 10 typically has high efficiency; therefore, this combination of speed and reduction ratio is beneficial for improving the efficiency of the powertrain 100. Furthermore, the reduction housing 21 of the reducer 20 is designed with a tapered shape to adapt to the output ends of each sub-reduction mechanism, reducing the volume and weight of the reduction housing 21. It can also accommodate the outer diameter of small-diameter bearings, which helps reduce frictional resistance and thus improves the transmission efficiency of the powertrain 100.
[0039] In one embodiment, the driving motor 10 is a permanent magnet synchronous motor, and the multi-stage speed reduction mechanism is a multi-stage planetary gear speed reduction mechanism, i.e., it includes a plurality of planetary gear speed reduction mechanisms connected in series. Each planetary gear speed reduction mechanism 20 has a central shaft as an input end, a ring gear fixed, and a planet carrier as an output end. For example Figure 3 In the embodiment shown, the multi-stage speed reduction mechanism includes a first-stage planetary gear speed reduction mechanism 22 and a second-stage planetary gear speed reduction mechanism 23 connected in series. The speed reduction ratio of the first-stage planetary gear speed reduction mechanism 22 is greater than that of the second-stage planetary gear speed reduction mechanism 23. Specifically, the speed reduction ratio of the first-stage planetary gear speed reduction mechanism 22 is any value in the range of 8-11, such as 8, 9, 10, or 11, and the speed reduction ratio of the second-stage planetary gear speed reduction mechanism 23 is any value in the range of 7-10, such as 7, 8, 9, or 10. Further, the speed reduction ratio of the first-stage planetary gear speed reduction mechanism 22 and the speed reduction ratio of the second-stage planetary gear speed reduction mechanism 23 are 8 and 7, respectively, the speed reduction ratio of the first-stage planetary gear speed reduction mechanism 22 and the speed reduction ratio of the second-stage planetary gear speed reduction mechanism 23 are 10 and 8, respectively, the speed reduction ratio of the first-stage planetary gear speed reduction mechanism 22 and the speed reduction ratio of the second-stage planetary gear speed reduction mechanism 23 are 11 and 7, respectively, and the like, without limitation. As shown in FIG. 1, Figure 3 As shown, the first-stage planetary gear speed reduction mechanism 22 includes a first central shaft 221, a first sun gear 222, a first planet carrier 223, a first planet gear 224, and a first ring gear 225. The first central shaft 221 is an output shaft of the driving motor 10, and in other embodiments not shown, the first central shaft 221 can be connected to the output shaft of the driving motor 10. The first ring gear 225 is fixedly arranged, and the first planet carrier 223 is an output end. The second-stage planetary gear speed reduction mechanism 23 includes a second central shaft 231, a second sun gear 232, a second planet carrier 233, a second planet gear 234, and a second ring gear 235. The second central shaft 231 is connected to the first planet carrier 223, the second ring gear 235 is fixedly arranged, and the second planet carrier 233 is an output end. In this embodiment, the speed reduction housing 21 includes a first housing 211 and a second housing 212. The upper portion of the first housing 211 is connected to the housing of the driving motor 10 and cooperatively defines a cavity for accommodating the first-stage planetary gear speed reduction mechanism 22. The lower portion of the first housing 211 is connected to the second housing 212 and cooperatively defines a cavity for accommodating the second-stage planetary gear speed reduction mechanism 23. The middle portion of the first housing 211 is contracted and configured to match the shape of the second central shaft 231. The second central shaft 231 is supported by a first bearing 226 at the first housing 211 and by a second bearing 236 at the second housing 212. Here, the contracted portion of the first housing 211 forms a structure for facilitating the installation of the smaller-diameter first bearing 226.
[0040] In the embodiment, the high-speed permanent magnet synchronous motor and the multi-stage planetary gear reduction mechanism are adopted, the permanent magnet synchronous motor has no rotor copper loss because the rotor has no winding, the loss is greatly reduced, the general efficiency can reach 90%-97% or even higher, and the efficiency of the planetary gear reduction mechanism is generally above 95%, so that the efficiency of the overall power mechanism can be greatly improved.
[0041] Further, by selecting the center shaft as the input end, the gear ring as the fixed end and the planetary carrier as the output end of each planetary gear reducer 20 mechanism, it is beneficial to realize a large reduction ratio, and the planetary carrier output weight is small, especially the rotational inertia is much smaller, the oil stirring damage is also smaller, so the efficiency is higher.
[0042] Further, by setting the reduction ratio of the first-stage planetary gear reduction mechanism 22 to be greater than the reduction ratio of the second-stage planetary gear reduction mechanism 23, the large rotating speed of the driving motor 10 is first quickly reduced by the first-stage planetary gear reduction mechanism 22, so as to reduce the high load work of the second-stage planetary gear reduction mechanism 23, thereby optimizing the working state of each reduction mechanism and reducing the friction and power loss of the overall system. And because the second-stage planetary gear reduction mechanism 23 handles a lower input speed and torque, the vibration and noise can be reduced, and the stability of the power assembly 100 output end is improved.
[0043] Figure 4 The exploded view of the fan blade connecting structure 30 and the extension shaft 24 is shown according to an embodiment of the utility model. As shown in Figure 4 Further, in one embodiment, the output end of the multi-stage reduction mechanism is an extension shaft 24 extending from one end of the reduction housing 21, for example, for the case where the output end is a planetary carrier, the extension shaft 24 is a fixed connection shaft with the planetary carrier. The power assembly 100 further comprises a fan blade connecting structure 30, the fan blade connecting structure 30 comprises an output flange 31 and a fan blade connecting ring 32. The output flange 31 is fixedly connected with the extension shaft 24, and the upper end surface of the output flange 31 is formed with a sink 311. The middle part of the fan blade connecting ring 32 is provided with a mounting hole 321 and is mounted at the sink 311 through the mounting hole 321, and the circumferential side of the fan blade connecting ring 32 is used to connect a plurality of fan blades 200. The output flange 31 is formed with an anti-rotation connection with the extension shaft 24 through a spline, for example, through a common key groove matching, or Figure 4The spline of the middle gear type can make the extension shaft 24 drive the output flange 31 to rotate and stably transmit torque, and the specific structure of the spline is not limited. Two elastic retaining rings 33 are fixed on the extension shaft 24, respectively located at the two ends of the output flange 31 in the axial direction, for limiting the axial displacement of the output flange 31. The flange gasket 34 is fixed at the bottom of the extension shaft 24, and the top of the flange gasket 34 is used to support the output flange 31. Here, the flange gasket 34 can be fixed to the bottom of the extension shaft 24 by the fastener 35, and the bottom of the output flange 31 is also provided with a counterbore 312 for accommodating the elastic retaining ring 33 at one end of the output flange 31, and the flange gasket 34 crosses the counterbore 312 and abuts against the output flange 31.
[0044] The embodiment provides a fan blade connecting structure 30 installed at the bottom of the speed reducer 20, which includes the output flange 31 fixedly connected with the extension shaft 24, the fan blade connecting ring 32 arranged at the upper end of the output flange 31, and the fan blade 200 connected through the fan blade connecting ring 32, so that the fan blade 200 can be well supported. The setting of the flange gasket 34 forms the anti-falling structure of the fan blade connecting ring 32 and the fan blade 200.
[0045] The application also provides an industrial fan, which includes a plurality of fan blades 200 and the power assembly 100 in any of the above embodiments.
[0046] The above is only some specific embodiments of the application, and any improvement made on the basis of the concept of the application is considered to be within the protection scope of the application.
Claims
1. A powertrain for an industrial fan, characterized in that, The powertrain includes: The drive motor has an output speed of any value between 3000 r / min and 6000 r / min; and A speed reducer, the input end of which is connected to the output end of the drive motor, the speed reducer having a reduction ratio of any value between 55 and 85, the speed reducer including a multi-stage reduction mechanism and a reduction housing, the output end of the multi-stage reduction mechanism being used to connect to the fan blades, the multi-stage reduction mechanism including multiple connected sub-reduction mechanisms, the connection structure of each sub-reduction mechanism being aligned with the output shaft of the drive motor, and the reduction housing being configured to be retracted to fit the connection structure of each sub-reduction mechanism.
2. The powertrain according to claim 1, characterized in that, The drive motor is a permanent magnet synchronous motor.
3. The powertrain according to claim 1, characterized in that, The multi-stage reduction mechanism is a multi-stage planetary gear reducer.
4. The powertrain according to claim 3, characterized in that, The multi-stage reduction mechanism includes a first-stage planetary gear reduction mechanism and a second-stage planetary gear reduction mechanism connected in series, wherein the reduction ratio of the first-stage planetary gear reduction mechanism is greater than the reduction ratio of the second-stage planetary gear reduction mechanism.
5. The powertrain according to claim 4, characterized in that, The reduction ratio of the first-stage planetary gear reduction mechanism is any value between 8 and 11, and the reduction ratio of the second-stage planetary gear reduction mechanism is any value between 7 and 10.
6. The powertrain according to claim 3, characterized in that, Each stage of the planetary gear reducer mechanism uses the central shaft as the input end, the gear ring as the fixed end, and the planet carrier as the output end.
7. The powertrain according to any one of claims 1-6, characterized in that, The output end of the multi-stage reduction mechanism is an extended rotating shaft that extends out of one end of the reduction housing; The powertrain also includes a fan blade connection structure, which includes: An output flange is fixedly connected to the protruding rotating shaft, and a countersunk platform is formed on the upper end face of the output flange; A fan blade connecting ring has a mounting hole in its middle and is installed on the recessed platform through the mounting hole. The periphery of the fan blade connecting ring is used to connect multiple fan blades.
8. The powertrain according to claim 7, characterized in that, The output flange is connected to the protruding shaft via a spline to prevent rotation. Two elastic retaining rings are fixed at the protruding shaft, located at both ends of the output flange in the axial direction, to limit the axial displacement of the output flange.
9. The powertrain according to claim 8, characterized in that, A flange gasket is fixed at the bottom of the protruding shaft, and the top of the flange gasket is used to support the output flange.
10. An industrial fan, characterized in that, It includes multiple fan blades and the powertrain according to any one of claims 1-9.