CN209053811U - Fan - Google Patents

Abstract

The utility model discloses a kind of fans, fan includes impeller assembly, impeller assembly includes the first impeller and the second impeller, multiple first blades that first impeller includes first wheel and is circumferentially arranged on first wheel, multiple second blades that second impeller includes the second wheel hub and is circumferentially arranged on the second wheel hub, first blade is at least partly located in same radial section with the second blade, and multiple first blades are located at the radial outside of multiple second blades；Driving device, driving device include electric machine support, motor and planetary gear mechanism, and motor is mounted on electric machine support, and motor has motor shaft, and planetary gear mechanism is mounted on electric machine support and is connected with motor shaft；One in first wheel and the second wheel hub is connected directly with motor shaft, another in first wheel and the second wheel hub is connected with planetary gear mechanism.Fan according to the present utility model, driving part is few, compact-sized, increases air supplying distance, reduces noise, improves wind pressure value.

Description

Fan with cooling device

Technical Field

The utility model belongs to the technical field of send out air equipment technique and specifically relates to a fan is related to.

Background

The fan is the air supply equipment that is everywhere visible in daily life, and the fan among the correlation technique, structure are complicated, and not only air supply distance is shorter, and the noise is great, and is uncomfortable when directly blowing to people.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least.

Therefore, the utility model provides a fan, the air supply distance of fan is longer.

The fan comprises an impeller assembly, the impeller assembly comprises a first impeller and a second impeller, the first impeller comprises a first hub and a plurality of first blades arranged on the first hub along the circumferential direction, the second impeller comprises a second hub and a plurality of second blades arranged on the second hub along the circumferential direction, at least part of the first blades and the second blades are positioned in the same radial section, and the first blades are positioned on the radial outer sides of the second blades; the driving device comprises a motor support, a motor and a planetary gear mechanism, wherein the motor is arranged on the motor support and is provided with a motor shaft, and the planetary gear mechanism is arranged on the motor support and is connected with the motor shaft; one of the first hub and the second hub is directly connected with the motor shaft, and the other of the first hub and the second hub is connected with the planetary gear mechanism, so that the power input end of the first impeller is different from the power input end of the second impeller.

According to the utility model discloses a fan, through in first wheel hub and second wheel hub directly link to each other with the motor shaft, another in first wheel hub and the second wheel hub links to each other with planetary gear mechanism, thereby make the power input end of first impeller different with the power input end of second impeller, need not to set up corresponding motor respectively to first impeller and second impeller specially, driving part is few, compact structure, and the manufacturing cost is reduced, increase air supply distance simultaneously, and the noise is reduced, improve the wind pressure value, even directly blow also not uncomfortable to feel facing to the people.

According to an embodiment of the present invention, the planetary gear mechanism includes: the sun gear is connected with the motor shaft and synchronously rotates, the gear ring is arranged opposite to the motor support, the first hub or the second hub is connected with the gear ring and synchronously rotates, the planet support is positioned between the motor support and the gear ring, the planet gear is provided with a planet gear shaft, the planet gear shaft is connected to the planet support, and the planet gear is respectively meshed with the sun gear and the gear ring.

According to an optional example of the present invention, the planet wheel is axially including: a first sub-wheel and a second sub-wheel, the first sub-wheel being in mesh with the sun wheel and the second sub-wheel being in mesh with the ring gear, the first sub-wheel and the second sub-wheel being different in at least one of the following parameters: modulus, number of teeth.

According to another optional example of the present invention, the planet carrier comprises: the support disc is opposite to the motor support, the planet wheel is positioned between the motor support and the support disc, and two ends of a planet wheel shaft are respectively connected to the motor support and the support disc; the connecting column is arranged on the support disc and is connected with the motor support.

According to yet another optional example of the present invention, the ring gear comprises: the protective cylinder is sleeved outside the sun gear, the planet gear and the planet support, and the inner peripheral wall of the protective cylinder is provided with inner teeth which are meshed with the planet gear; the sleeve is connected to one end, far away from the motor support, of the protective sleeve, the sleeve is sleeved on the motor shaft, and a gear ring bearing is matched between the sleeve and the motor shaft; the first hub or the second hub is sleeved on the protective sleeve and connected to the sleeve.

According to another embodiment of the present invention, the fan further comprises: a fan case, the impeller assembly and the drive device being disposed within the fan case, the fan case comprising: the front cover is arranged over against the first impeller and the second impeller, the front cover is positioned on one side, far away from the first hub, of the second hub, and the front cover is in a grid shape; the rear cover is arranged opposite to the front cover and is positioned on one side, far away from the second hub, of the first hub.

In some optional examples, a partition barrel is arranged on the front cover, and the partition barrel is located on the radial outer side of the second blade and on the radial inner side of the first blade.

In some optional examples, the motor bracket is connected to the partition barrel.

In some optional examples, the rear cover is a closed cover or the rear cover is in a grid shape.

According to a further embodiment of the present invention, the first hub is connected to the planetary gear mechanism, and the first impeller includes: a support ring which is sleeved outside the second impeller in the radial direction, and to which the plurality of first blades are connected; a plurality of support ribs connected between the support ring and the first hub.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a fan according to an embodiment of the present invention;

FIG. 2 is a schematic view of an impeller assembly of a fan according to an embodiment of the present invention;

fig. 3 is a cross-sectional view of a fan according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

fig. 5 is a schematic view of a planetary gear mechanism according to an embodiment of the present invention;

fig. 6 is a schematic perspective view of a planetary gear according to an embodiment of the present invention;

FIG. 7 is a schematic view of the second sub-wheel of FIG. 6;

FIG. 8 is a schematic view of the first sub-wheel of FIG. 6;

fig. 9 is a schematic perspective view of a planet carrier according to an embodiment of the present invention.

Reference numerals:

100: a fan; 110: a base;

10: an impeller assembly; 11: a first impeller; 111: a first hub; 112: a first blade; 113: a support ring; 114: supporting ribs; 12: a second impeller; 121: a second hub; 122: a second blade;

20: a motor; 21: a motor shaft; 22: a motor bracket;

30: a fan case; 31: a front cover; 32: a rear cover; 33: a separating cylinder;

50: a planetary gear mechanism; 51: a sun gear; 52: a planet wheel; 521: a first sub-wheel; 522: a second sub-wheel; 523: a planetary wheel shaft; 524: a planetary wheel axle hole; 525: a planet wheel bearing; 53: a planet carrier; 531: a support plate; 532: connecting columns; 533: a bracket bearing; 54: a ring gear; 541: protecting the cylinder; 542: a sleeve; 543: and a ring gear bearing.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

A fan 100 according to an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 1 to 4, a fan 100 according to an embodiment of the present invention includes an impeller assembly 10 and a driving device (e.g., a motor 20) for driving the impeller assembly 10 to rotate.

Specifically, the impeller assembly 10 includes a first impeller 11 and a second impeller 12, wherein the first impeller 11 includes a first hub 111 and a plurality of first blades 112, the plurality of first blades 112 are circumferentially arranged on the first hub 111, the second impeller 12 includes a second hub 121 and a plurality of second blades 122, the plurality of second blades 122 are circumferentially arranged on the second hub 121, it can be understood that the first blades 112 and the second blades 122 in fig. 1 and 2 are both formed into a three-dimensional spiral structure, at least a portion of the first blades 112 and the second blades 122 are located in the same radial cross section, and the plurality of first blades 112 are located at the radial outer side of the plurality of second blades 122, so as to save space.

As shown in fig. 4 and 5, the driving device includes a motor holder 22, a motor 20, and a planetary gear mechanism 50. Wherein, as shown, the motor 20 is mounted on a motor bracket 22, the motor bracket 22 providing support and positioning for the motor 20.

The motor 20 has a motor shaft 21, the planetary gear mechanism 50 is mounted on the motor support 22 and connected to the motor shaft 21, the motor support 22 has supporting and positioning functions on the planetary gear mechanism 50, wherein one of the first hub 111 and the second hub 121 is directly connected to the motor shaft 21, and the other of the first hub 111 and the second hub 121 is connected to the planetary gear mechanism 50, for example, the first hub 111 is connected to the planetary gear mechanism 50, the first hub 111 is indirectly driven by the motor shaft 21 to rotate, the second hub 121 is directly connected to the motor shaft 21, and the second hub 121 and the motor shaft 21 rotate synchronously, so that the driving parts are few, the structure is compact, and the power input end of the first impeller 11 is different from the power input end of the second impeller 12.

The power input end of the first impeller 11 is different from the power input end of the second impeller 12, that is, the control mode of the first impeller 11 is different from the control mode of the second impeller 12, and specifically, the first impeller 11 rotates and the second impeller 12 does not rotate, or the first impeller 11 does not rotate and the second impeller 12 rotates.

It can also be that the rotation direction of first impeller 11 and second impeller 12 is different, for example first impeller 11 anticlockwise rotation, second impeller 12 clockwise rotation, it is different to show still that the rotational speed of first impeller 11 and second impeller 12 is different, for example the rotational speed of first impeller 11 is greater than the rotational speed of second impeller 12, in order to satisfy the air supply mode that fan 100 is different, can select different control mode according to user's different demands, it is more nimble to use, simultaneously, both can improve the air supply distance and the air supply direction of impeller subassembly 10 like this, can improve the wind pressure value again, even make fan 100 directly blow to the people and also can not have uncomfortable sense.

According to the utility model discloses fan 100, through in first wheel hub 111 and second wheel hub 121 one with motor shaft 21 directly link to each other, another in first wheel hub 111 and the second wheel hub 121 links to each other with planetary gear mechanism 50, thereby make the power input end of first impeller 11 different with the power input end of second impeller 12, need not to set up corresponding motor 20 respectively to first impeller 11 and second impeller 12 specially, the drive assembly is few, moreover, the steam generator is compact in structure, and the production cost is reduced, increase air supply distance simultaneously, the noise reduction, improve the wind pressure value, even directly blow to the people and also not uncomfortable.

Specifically, as shown in fig. 4 and 5, the planetary gear 52 mechanism includes a sun gear 51, planetary gears 52, a planet carrier 53, and a ring gear 54. The sun gear 51 is connected with the motor shaft 21 and rotates synchronously, the rotating speed of the sun gear 51 is equal to that of the motor shaft 21, and the gear ring 54 is arranged opposite to the motor support 22. The first hub 111 or the second hub 121 is connected to the ring gear 54 and rotates synchronously, and the rotation speed of the ring gear 54 is equal to that of the first hub 111 or the second hub 121. Space is formed between the ring gear 54 and the motor carrier 22 and other components in the planetary 52 mechanism can be mounted.

The planet carrier 53 is located between the motor carrier 22 and the ring gear 54. The planet carrier 53 may be stationary relative to the motor carrier 22 and rotatable relative to the ring gear 54.

The planetary gear 52 has a planetary gear shaft 523, and the planetary gear shaft 523 is connected to the planetary carrier 53. The planetary wheel shaft 523 provides support for the rotation of the planetary wheel 52, prevents the planetary wheel 52 from deviating from the rotation center during rotation, and ensures the stability of the rotation transmission.

Specifically, as shown, the planet gears 52 are meshed with the sun gear 51 and the ring gear 54, respectively. The power transmission process from the motor shaft 21 to the second fan 100 is as follows: the motor shaft 21 rotates and drives the sun gear 51 to rotate synchronously, the sun gear 51 drives the planet gears 52 engaged with the sun gear to rotate, and the rotation of the planet gears 52 drives the ring gear 54 engaged with the planet gears to rotate, so that the second fan 100 is driven to rotate. It will be appreciated that the gear parameters of the ring gear 54 and the sun gear 51, herein, may determine the gear speed ratio between the first fan 100 and the second fan 100.

Compare with the circulation fan of current bi-motor axial fan or single fan, the utility model discloses single motor 20 drive bilobed wheel is rotatory, utilizes the influence each other of bilobed wheel wind pressure, has increased the distance to the whole air-out of fan 100, is favorable to reducing the air-out wind pressure moreover, makes the air-out wind sense of fan 100 more comfortable. The noise generated using the single motor 20 is low and the first and second impellers 11 and 12 are more stable when rotated. According to the planetary gear mechanism 50, the planet wheel 52 is supported on the planet carrier 53 through the planet wheel shaft 523, so that the stability of the planet wheel shaft 523 can be improved, the engagement noise of the movement of the planet wheel 52 is reduced, and the service life of the planet wheel 52 is prolonged.

As shown in fig. 6, 7, and 8, the planetary gear 52 includes, in the axial direction: a first sub-wheel 521 and a second sub-wheel 522, the first sub-wheel 521 meshing with the sun gear 51, the second sub-wheel 522 meshing with the ring gear 54. The first sub-wheel 521 and the second sub-wheel 522 are concentric and coaxial, and rotate together under the driving of the sun gear 51. The gear parameters of the first sub-wheel 521 and the second sub-wheel 522 are different, so that the engagement between the sun gear 51 and the first sub-wheel 521 reaches one rotation speed difference, the engagement between the gear ring 54 and the second sub-wheel 522 reaches another rotation speed difference, and the total rotation speed difference is obtained by combining the two rotation speed differences, so that it is easier to obtain an ideal transmission ratio between the first impeller 11 and the second impeller 12.

Moreover, if the planet gears 52 are only a single gear, to achieve the desired transmission ratio, the diameter of the planet gears 52 is large, which makes the diameter of the entire planetary gear mechanism 50 too large, affecting the blade size of the second fan 100. Therefore, the planet gears 52 are arranged as the first sub-gear 521 and the second sub-gear 522, which is beneficial for reducing the diameter of the planetary gear mechanism 50. In the example shown in the figure, the motor 20 is located in the second hub 121, the planetary gear mechanism 50 is located in the first hub 111, and the hub diameters of the two impellers are close, so that the first impeller 11 and the second impeller 12 are opposite at the blade root, the mutual influence area is large, and the ideal wind pressure is easily achieved.

In addition, the first sub-wheel 521 and the second sub-wheel 522, which are arranged along the axial direction, of the planet wheel 52 are just by utilizing the structural characteristics of the fan 100. Particularly, the embodiment of the present invention provides a fan 100, which aims to utilize the wind pressure between two impellers to influence, so that the wind blowing distance of the fan 100 is farther, and the wind pressure is lower. For this purpose, a distance is present between the two impellers, and it is this distance that is used that the planet wheels 52 are arranged as a first sub-wheel 521 and a second sub-wheel 522.

Here, the gear parameters of the first sub-wheel 521 and the second sub-wheel 522 may be different, the modules of the first sub-wheel 521 and the second sub-wheel 522 may be different, the numbers of teeth of the first sub-wheel 521 and the second sub-wheel 522 may be different, or both the modules and the numbers of teeth of the first sub-wheel 521 and the second sub-wheel 522 may be different.

Therefore, the transmission ratio range between the sun gear 51 and the gear ring 54 is large, even the transmission ratio can reach 0-100, and the rotating speed ratio of the first impeller 11 and the second impeller 12 can reach 0-100.

Optionally, the transmission ratio between the second impeller 12 and the first impeller 11 is 2, and the rotation speed of the second impeller 12 is greater than that of the first impeller 11, and the wind pressure influence between the two impellers is optimal.

The first sub-wheel 521 and the second sub-wheel 522 are two gears with different modules which are concentrically combined, and can realize the torque transmission of the gears with different modules. Optionally, the modulus of the first sub-wheel 521 is 1, the modulus of the second sub-wheel 522 is 1.5, and the modulus difference between the two sub-wheels is small, so that the transmission is smoother.

Optionally, the number of the planet wheels 52 can be 1-8, when the number of the planet wheels 52 is multiple, the multiple planet wheels 52 are uniformly arranged around the circumference of the sun wheel 51, and preferably, the number of the planet wheels 52 is 3, so that the sun wheel 51 drives the various planet wheels 52 to stably rotate, the various planet wheels 52 are uniformly stressed, and the stability of transmission is ensured.

In some embodiments of the present invention, as shown in fig. 4, 5, and 9, the planet carrier 53 includes: a bracket disc 531 and a connecting column 532.

The support disc 531 is arranged opposite to the motor support 22, the planet wheel 52 is located between the motor support 22 and the support disc 531, and two ends of the planet wheel shaft 523 are respectively connected to the motor support 22 and the support disc 531. The connecting column 532 is arranged on the bracket disc 531, and the connecting column 532 is connected with the motor bracket 22. The support disc 531 is fixedly connected with the motor support 22 through a connecting column 532, so that the support disc 531 and the motor support 22 are relatively fixed, a fixed connecting position is provided for the planet wheel shaft 523, the planet wheels 52 are not easy to axially and radially move during rotation, and positioning is provided for the relative position between each planet wheel 52 and the sun wheel 51.

In other embodiments, the planet carrier 53 may not have the connecting column 532, and the planet shaft 523 may be directly fixedly connected to the planet carrier 53.

As shown in fig. 5, 9, the holder plate 531 and the motor holder 22 are provided with opposed pinion shaft holes 524 at surfaces facing each other, respectively, and both ends of the pinion shaft 523 are fitted in the pinion shaft holes 524 of the holder plate 531 and the motor holder 22, respectively. The planet axle hole 524 provides a positioning and connecting point for the planet axle 523, which is beneficial for the planet wheels 52 to rotate by taking the planet axle 523 as a rotating shaft, ensures that the planet axle 523 is parallel to the motor shaft 21, and ensures the axle center spacing between the planet wheels 52.

Optionally, the planet wheel 52 is sleeved on a planet wheel shaft 523, and two planet wheel bearings 525 are arranged between the planet wheel 52 and the planet wheel shaft 523, and the two planet wheel bearings 525 are located at two ends of the planet wheel shaft 523. The planet bearings 525 allow the planet 52 to be better coupled to the planet shaft 523 and the rotation of the planet 52 is smoother.

In some embodiments of the present invention, as shown in the figure, the planetary carrier 53 is sleeved on the motor shaft 21, and a carrier bearing 533 is fitted between the planetary carrier 53 and the motor shaft 21. The support bearing 533 provides support for the portion of the planet carrier 53 that is nested with the motor shaft 21. Moreover, the concentric position of the sun gear 51 and the planet carrier 53 is ensured, and the coaxial positioning of the planet gear 52 mechanism and the motor 20 is realized.

In some embodiments of the present invention, as shown in fig. 5, the ring gear 54 includes: casing 541 and sleeve 542.

The casing 541 is externally sleeved on the outer sides of the sun gear 51, the planet gear 52 and the planet carrier 53, and the inner peripheral wall of the casing 541 is provided with inner teeth for meshing with the planet gear 52. The casing 541 can be driven by the planet wheel 52 to rotate, and can also protect each internal transmission structure, so that the exterior is more beautiful.

The sleeve 542 is connected to one end of the protective sleeve 541 far away from the motor support 22, the sleeve 542 is sleeved on the motor shaft 21, and a ring gear bearing 543 is matched between the sleeve 542 and the motor shaft 21. The ring gear bearing 543 makes the sleeve 542 easier to rotate relative to the motor shaft 21, ensuring that the ring gear 54 does not deflect when it is rotated by the planet gears 52. The first hub 111 or the second hub 121 is sleeved on the casing 541 and connected to the sleeve 542, for example, the first hub 111 is sleeved on the casing 541 and connected to the sleeve 542, so that the two impellers integrally rotate on the same axis, and the balance force during rotation is increased.

As shown in fig. 1, according to another embodiment of the present invention, the fan 100 further includes a fan casing 30, the impeller assembly 10 is rotatably disposed in the fan casing 30, the driving device is connected to the fan casing 30, the fan casing 30 protects the impeller assembly 10 and the driving device, and does not suffer from external interference and collision, and meanwhile, when in use, the impeller assembly 10 can be prevented from being damaged by human body when rotating, which is more safe and reliable.

Further, the fan casing 30 includes a front cover 31 and a rear cover 32, the front cover 31 is disposed opposite to the first impeller 11 and the second impeller 12, the front cover 31 is disposed on a side of the second hub 121 far away from the first hub 111 (i.e. a front side of the second hub 121), the front cover 31 is formed into a grid shape, and specifically may be a mesh structure radiating from the center to the periphery, and may also be a plurality of horizontal bar-shaped openings, so as to suck or blow air from the front side, the rear cover 32 is disposed opposite to the front cover 31, the rear cover 32 is disposed on a side of the first hub 111 far away from the second hub 121 (i.e. a rear side of the first hub 111), and the rear cover 32 cooperates with the front cover 31 to define the impeller assembly 10 and the driving device in the fan casing 30.

According to an optional example of the present invention, the rear cover 32 may be a closed cover, or the rear cover 32 may also be formed in a grid shape, if the rear cover 32 is formed in a closed cover, the fan 100 draws air from the front cover 31 and supplies air from the front cover 31, if the rear cover 32 is formed in a grid shape, air may flow in the front-rear direction, and supplies air from the front side to the rear side, or supplies air from the rear side to the front side, and the structural form of the rear cover 32 may be specifically selected as needed, which is not specifically limited by the present invention.

As shown in fig. 3, according to another alternative example of the present invention, a partition 33 is provided on the front cover 31, the partition 33 is located on the radial outer side of the second blade 122 and on the radial inner side of the first blade 112, and the partition 33 is provided on the front cover 31 to divide the first blade 112 and the second blade 122 into different regions, so as to draw air from different ranges or supply air to different ranges, thereby increasing the air drawing amount of the fan 100 and the air supply range of the fan 100 in space. The region where the first blade 112 is located outside the region where the second blade 122 is located, if a forward air supply mode is adopted, air is sucked from the rear side of the fan 100, air flow can be respectively sent out from the region where the first blade 112 is located in an annular mode and sent out from the region where the second blade 122 is located in a forward mode, the air supply range of the fan 100 in space is enlarged, if a backward air supply mode is adopted, air is sucked from the front side of the fan 100, specifically, air flow can respectively enter from the region where the first blade 112 is located in an annular mode and enter from the region where the second blade 122 is located in a forward mode, then the air is intensively sent out from the rear side of the fan 100, the air suction amount of the fan 100 is increased, and the air supply distance is further increased.

If the front-back simultaneous air supply mode is adopted, the air flow part sucked from the back side is sent out from the area ring where the first blade 112 is located and sent out to the front side from the area where the second blade 122 is located, the other part enters from the area ring where the second blade 122 is located after being sent out from the area ring where the first blade 112 is located, and then is sent out from the back side of the fan 100, namely, air is sucked and supplied from the front side and the back side of the fan 100, and the air supply direction and the air supply distance are improved.

In some alternative examples, the motor bracket 22 is connected to the partition 33, and the motor bracket 22 is fixed on the partition 33 to connect the driving device to the front cover 31, so that the whole structure is stable and reliable.

Optionally, the fan casing 30 includes an outer cylinder 34, the outer cylinder 34 covers the circumferential outer side of the impeller assembly 10, the front cover 31 and the rear cover 32 cover both ends of the outer cylinder 34 respectively, the axial width of the outer cylinder 34 is greater than the axial width of the first blade 11, after the air enters the fan casing 30, the air can be stored in the area covered by the outer cylinder 34 for a period of time, and the air collecting function is provided, so that the air supply distance can be further increased under the driving of the impeller assembly 10.

As shown in fig. 2, according to another embodiment of the present invention, the first impeller 11 includes a support ring 113 and a plurality of support ribs 114, the support ring 113 is sleeved outside the second impeller 12 in the radial direction, the plurality of first blades 112 are connected to the support ring 113, the plurality of support ribs 114 are connected between the support ring 113 and the first hub 111, the support ring 113 and the support ribs 114 jointly support the plurality of first blades 112, and the support ribs 114 extend backwards in width, which not only enhances the structural strength of the first impeller 11, but also disturbs the airflow when the impeller assembly 10 rotates.

In the description of the present invention, "a plurality" means two or more.

It should be noted that the fan 100 further includes a base 110, the base 110 is used for supporting the fan casing 30 and the impeller assembly 10, and a control unit is arranged at the front side of the base 110 and used for controlling the start and stop of the fan 100 and adjusting the air supply amount.

To better understand the solution of the embodiment of the present invention, the structure of the fan 100 in an embodiment of the present invention is described below with reference to fig. 1 to 9.

As shown in fig. 1 and 2, a fan 100 includes a motor holder 22, a motor 20, a first impeller 11, a second impeller 12, and a planetary gear mechanism 50. The motor 20 is installed in the motor bracket 10, two ends of the motor 20 respectively extend out of the motor shaft 21 along the axial direction, wherein the motor shaft 21 on one side is connected with the second impeller 12, the second hub 121 is sleeved on the motor 20, the motor shaft 21 on the other side is sleeved with the planetary gear mechanism 50, the first impeller 11 is connected to the other end of the motor shaft 21 through the planetary gear mechanism 50, and the first hub 111 is sleeved on the planetary gear mechanism 50.

As shown in fig. 4 and 5, the planetary gear mechanism 50 includes a sun gear 51, a planetary gear 52, a planet carrier 53, and a ring gear 54. Wherein the sun gear 51 is connected with the motor shaft 21 and rotates synchronously, the ring gear 54 is arranged opposite to the motor support 10, the planet support 53 is positioned between the motor support 10 and the ring gear 54, and the first impeller 11 is connected with the ring gear 54 and rotates synchronously.

As shown in fig. 3, 4, and 5, the planetary carrier 53 is fitted around the motor shaft 21, and a carrier bearing 533 is fitted between the planetary carrier 53 and the motor shaft 21. The planet carrier 53 includes: a bracket disc 531 and a connecting column 532. The support disc 531 is fixed on the motor support 10 through a connecting column 532, the support disc 531 and the motor support 10 are arranged oppositely, three sets of opposite planetary wheel shaft holes 524 are respectively arranged on the surfaces of the support disc 531 and the motor support 10 facing each other, two ends of a planetary wheel shaft 523 are respectively matched in the support disc 531 and the planetary wheel shaft holes 524 of the motor support 10, three sets of planetary wheels 52 are sleeved in the planetary wheel shaft 523 between the motor support 10 and the support disc 531, and each planetary wheel 52 is meshed with the sun wheel 51 in the middle. Two planet wheel bearings 525 are arranged between the planet wheel 52 and the planet wheel shaft 523, and the two planet wheel bearings 525 are positioned at two ends of the planet wheel shaft 523.

As shown in fig. 5, the ring gear 54 includes: casing 541 and sleeve 542. The casing 541 is externally sleeved on the outer sides of the sun gear 51, the planet gear 52 and the planet carrier 53, and the inner peripheral wall of the casing 541 is provided with inner teeth for meshing with the planet gear 52. The sleeve 542 is connected to one end of the casing 541 far from the motor bracket 10, the sleeve 542 is sleeved on the motor shaft 21, and a ring gear bearing 543 is respectively matched between the inner peripheral wall of the sleeve 542 and the motor shaft 21.

As shown in fig. 5, 6, and 7, 3 planetary gears 52 are uniformly arranged along the circumferential direction of the sun gear 51, the planetary gears 52 include a first sub-gear 521 and a second sub-gear 522 which have different modulus along the axial direction, the first sub-gear 521 meshes with the sun gear 51, and the second sub-gear 522 meshes with the ring gear 54. The modulus of the first sub-wheel 521 is 1, and the modulus of the second sub-wheel 522 is 1.5, so that the rotation speed of the first fan 30 is greater than that of the second fan 40, and when the first fan 30 rotates clockwise, the second fan 40 rotates counterclockwise.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "front", "back", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Other constructions and operations of the fan 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. A fan, comprising:

an impeller assembly, the impeller assembly comprising: the impeller comprises a first impeller and a second impeller, wherein the first impeller comprises a first hub and a plurality of first blades arranged on the first hub along the circumferential direction, the second impeller comprises a second hub and a plurality of second blades arranged on the second hub along the circumferential direction, at least part of the first blades and the second blades are positioned in the same radial section, and the plurality of first blades are positioned at the radial outer sides of the plurality of second blades;

the driving device comprises a motor support, a motor and a planetary gear mechanism, wherein the motor is arranged on the motor support and is provided with a motor shaft, and the planetary gear mechanism is arranged on the motor support and is connected with the motor shaft; wherein,

one of the first hub and the second hub is directly connected to the motor shaft, and the other of the first hub and the second hub is connected to the planetary gear mechanism, so that a power input end of the first impeller is different from a power input end of the second impeller.

2. The fan as claimed in claim 1, wherein the planetary gear mechanism comprises: the sun gear is connected with the motor shaft and synchronously rotates, the gear ring is arranged opposite to the motor support, the first hub or the second hub is connected with the gear ring and synchronously rotates, the planet support is positioned between the motor support and the gear ring, the planet gear is provided with a planet gear shaft, the planet gear shaft is connected to the planet support, and the planet gear is respectively meshed with the sun gear and the gear ring.

3. The fan of claim 2, wherein the planet gears axially comprise: a first sub-wheel and a second sub-wheel, the first sub-wheel being in mesh with the sun wheel and the second sub-wheel being in mesh with the ring gear, the first sub-wheel and the second sub-wheel being different in at least one of the following parameters: modulus, number of teeth.

4. The fan as claimed in claim 2, wherein the planet carrier includes:

the support disc is opposite to the motor support, the planet wheel is positioned between the motor support and the support disc, and two ends of a planet wheel shaft are respectively connected to the motor support and the support disc;

the connecting column is arranged on the support disc and is connected with the motor support.

5. The fan as claimed in claim 2, wherein the ring gear includes:

the protective cylinder is sleeved outside the sun gear, the planet gear and the planet support, and the inner peripheral wall of the protective cylinder is provided with inner teeth which are meshed with the planet gear;

the sleeve is connected to one end, far away from the motor support, of the protective sleeve, the sleeve is sleeved on the motor shaft, and a gear ring bearing is matched between the sleeve and the motor shaft; wherein,

the first hub or the second hub is sleeved on the protective sleeve and connected to the sleeve.

6. The fan as claimed in claim 1, further comprising: a fan case, the impeller assembly and the drive device being disposed within the fan case, the fan case comprising:

the front cover is arranged over against the first impeller and the second impeller, the front cover is positioned on one side, far away from the first hub, of the second hub, and the front cover is in a grid shape;

the rear cover is arranged opposite to the front cover and is positioned on one side, far away from the second hub, of the first hub.

7. The fan as claimed in claim 6, wherein a partition is provided on the front cover, the partition being located radially outward of the second blades and radially inward of the first blades.

8. The fan of claim 7 wherein said motor bracket is attached to said spacer.

9. The fan of claim 6, wherein the rear cover is a closed cover or the rear cover is a grill-like shape.

10. The fan as claimed in claim 1, wherein the first hub is connected to the planetary gear mechanism, and the first impeller includes:

a support ring which is sleeved outside the second impeller in the radial direction, and to which the plurality of first blades are connected;

a plurality of support ribs connected between the support ring and the first hub.