TWI648469B - Coaxial double ceiling fan - Google Patents

Abstract

A coaxial double ceiling fan is used to solve the problem of conventional assembly trouble and time-consuming. The system includes: a central shaft with an enlarged diameter section; a first ceiling fan group with a first stator and a first rotor, the first stator is fixedly coupled to the central shaft, and the first rotor is rotatably Combined with the central shaft, the first ceiling fan group has a first bearing group and a first fan blade, the first fan blade is combined with the first rotor; and a second ceiling fan group, has a second stator and a A second rotor, the second stator is fixedly coupled to the central axis, the second rotor is rotatably coupled to the central axis, the second ceiling fan group has a second bearing group and a second blade, the second fan The blade is coupled to the second rotor; wherein, the first bearing set or the second bearing set is positioned at the enlarged diameter section.

Description

Coaxial double ceiling fan

The invention relates to a ceiling fan, especially a coaxial double ceiling fan with two ceiling fan groups.

The conventional ceiling fans mostly use a motor to drive the fan blades to rotate and drive the airflow. If you want to provide a larger air volume, you need to install a large ceiling fan, but the large ceiling fan has a longer blade, which is used for transportation, loading and installation. It is troublesome and requires a large area of space.

Therefore, another type of double-blade group ceiling fan is provided on the market. The double-blade group ceiling fan has a central axis, a first fan group, and a second fan group. The central axis has a plurality of through holes, the first The blade group is positioned in one of the through holes by a sleeve and a pin, and the second blade group is also positioned in the other through hole by a sleeve and a pin, so that the first blade group and the The second fan blade group can be positioned on the central shaft, and the first fan blade group and the second fan blade group are simultaneously rotated by a motor. However, the central shaft needs to have a plurality of through holes and cooperate with the sleeve The barrel and the insertion tip are aligned with the through hole to position the first fan blade group and the second fan blade group on the central axis. In addition to the limited bearing weight, the assembly operation is also time-consuming and cumbersome In addition, due to the limitation of the setting of the single motor, the function of the double-blade group ceiling fan is lacking.

In view of this, the conventional ceiling fan does still need to be improved.

In order to solve the above problems, the present invention provides a coaxial double ceiling fan, which is a coaxial double ceiling fan with convenient transportation and loading, saving assembly time and increasing practical safety.

The following directivity or similar terms of the invention, such as "front", "rear", "upper (top)", "lower (bottom)", "inner", "outer", "side", etc. With reference to the directions of the attached drawings, each directivity or its approximate terms are only used to help explain and understand the embodiments of the present invention, and are not intended to limit the present invention.

The coaxial double ceiling fan of the present invention includes: a central shaft with an enlarged diameter section formed with an upper shoulder and a lower shoulder; a first ceiling fan group with a first stator and a first rotor , The first stator is fixedly coupled to the central axis, the first rotor is rotatably coupled to the central axis, the first ceiling fan group has a first bearing group and a first fan blade, the first fan blade is combined To the first rotor; and a second ceiling fan group, having a second stator and a second rotor, the second stator is fixedly coupled to the central axis, the second rotor is rotatably coupled to the central axis, the first The two ceiling fan sets have a second bearing set and a second blade, the second blade is combined with the second rotor; wherein, the second bearing set has an upper bearing and a lower bearing, the upper bearing is positioned at the expansion At the upper shoulder of the diameter section, the lower bearing is coupled to the central axis.

The coaxial double ceiling fan of the present invention includes: a central shaft with an enlarged diameter section formed with an upper shoulder and a lower shoulder; a first ceiling fan group with a first stator and a first rotor , The first stator is fixedly coupled to the central axis, the first rotor is rotatably coupled to the central axis, the first ceiling fan group has a first bearing group and a first fan blade, the first fan blade is combined In the first rotor, the first bearing set has an upper bearing and a lower bearing, the upper bearing is positioned at the shoulder above the enlarged diameter section, the lower bearing is coupled to the central shaft; and a second ceiling fan set has A second stator and a second rotor, the second stator is fixedly coupled to the central axis, the second rotor is rotatably coupled to the central axis, the second ceiling fan group has a second bearing group and a second fan Blade, the second blade is combined with the second rotor; wherein, the second ceiling fan group has a second positioning member, the second positioning member is disposed between the upper bearing and the lower bearing of the second bearing group and The upper bearing is abutted and fixed.

According to this, the coaxial double ceiling fan of the present invention utilizes the central shaft The design can directly bear the weight of one of the ceiling fan groups, and can quickly complete the positioning and assembly of the ceiling fan group, thereby saving the assembly time and cost of the overall coaxial double ceiling fan, and improving the effectiveness of practical safety.

Wherein, the first ceiling fan group has a first positioning member, the first positioning member is sleeved on the central shaft and abuts and fixes between the upper bearing and the lower bearing of the first bearing group. In this way, it has the effect of making the positioning of the first ceiling fan group in the axial direction safe.

Wherein, the first positioning member is a sleeve or a positioning pin or a sleeve combined with a positioning pin. In this way, it has the effect of convenient assembly.

Wherein, the sleeve is positioned on the central axis in a clamping or locking manner. In this way, it has the effect of convenient positioning.

Wherein, the first fan blade is combined with the lower surface of the first ceiling fan group, and the second fan blade is combined with the lower surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the lower surface of the first ceiling fan group, and the second fan blade is combined with the upper surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the upper surface of the first ceiling fan group, and the second fan blade is combined with the lower surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the upper surface of the first ceiling fan group, and the second fan blade is combined with the upper surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the second ceiling fan group has a second elastic member, the second elastic member is disposed on the central shaft and abuts between the shoulder under the central shaft and the bearing under the second bearing group. In this way, it has the effect of generating a preload on the second bearing set.

Wherein, a divider is further included, the divider is sleeved on the central axis and respectively abuts the first ceiling fan group and the second ceiling fan group. In this way, it has the effect of ensuring a certain safety distance between the first ceiling fan group and the second ceiling fan group.

Wherein, the first bearing set has an upper bearing and a lower bearing, the upper bearing is positioned at the shoulder above the enlarged diameter section, and the lower bearing is coupled to the central shaft. In this way, it has the effect of making the positioning of the first ceiling fan group in the axial direction safe.

Wherein, the second positioning member is a sleeve or a positioning pin or a sleeve combined with a positioning pin. In this way, it has the effect of convenient assembly.

Wherein, the first fan blade is combined with the lower surface of the first ceiling fan group, and the second fan blade is combined with the lower surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the upper surface of the first ceiling fan group, and the second fan blade is combined with the upper surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the lower surface of the first ceiling fan group, and the second fan blade is combined with the upper surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the first fan blade is combined with the upper surface of the first ceiling fan group, and the second fan blade is combined with the lower surface of the second ceiling fan group. In this way, it has the effect of providing different wind drive on the same axis and different axial heights.

Wherein, the second ceiling fan group has a second elastic member, and the second elastic member is disposed on the central shaft and abuts between the second positioning member and the bearing under the second bearing group. In this way, it has the effect of generating a preload on the second bearing set.

Wherein, a divider is further included, the divider is sleeved on the central axis and respectively abuts the first ceiling fan group and the second ceiling fan group. In this way, it is ensured that the first ceiling fan group and the first There is a certain safety distance between the ceiling fans.

Wherein, the first ceiling fan group has a first elastic member, the first elastic member is disposed on the central shaft and abuts between the shoulder under the central shaft and the bearing under the first bearing group. In this way, it has the effect of generating a preload on the first bearing set.

Wherein, the first ceiling fan group and the second ceiling fan group rotate alternately. In this way, it has the effect of meeting the needs in different environments.

Wherein, the first ceiling fan group and the second ceiling fan group rotate in different directions. In this way, it has the effect of generating requirements for different diversion directions.

Wherein, the rotation speed of the first ceiling fan group and the rotation speed of the second ceiling fan group are different. In this way, it has the effect of generating different wind speeds.

The color of the first fan blade and the color of the second fan blade are different. In this way, it has the effect of distinguishing functionality and aesthetic design by color.

Wherein, the outer diameter of the first blade and the outer diameter of the second blade are different. In this way, the first fan blade and the second fan blade can act on a range of different sizes, and have different effects according to environmental requirements.

The shape of the first blade and the shape of the second blade are different. In this way, it has the function of functional differentiation and beautiful design.

Among them, the forming method of the enlarged diameter section is integrally formed. In this way, it has the effect of increasing the bonding strength.

1‧‧‧Central axis

11‧‧‧Expanded section

111‧‧‧ Upper shoulder

112‧‧‧Lower shoulder

2‧‧‧The first ceiling fan group

21‧‧‧First stator

22‧‧‧The first rotor

23‧‧‧First bearing set

231‧‧‧Upper bearing

232‧‧‧Lower bearing

24‧‧‧First positioning piece

241‧‧‧Sleeve

242‧‧‧positioning pin

25‧‧‧The first leaf

26‧‧‧The first elastic piece

3‧‧‧The second ceiling fan group

31‧‧‧Second stator

32‧‧‧Second rotor

33‧‧‧Second bearing set

331‧‧‧Upper bearing

332‧‧‧Lower bearing

34‧‧‧Second positioning piece

341‧‧‧Sleeve

342‧‧‧positioning pin

35‧‧‧Second fan blade

36‧‧‧Second elastic piece

4‧‧‧Partition

Fig. 1: Combination sectional view of the first embodiment of the present invention.

Figure 2: A combined cross-sectional view of a second embodiment of the invention.

Figure 3: A combined cross-sectional view of a third embodiment of the invention.

Fig. 4: A combined cross-sectional view of a fourth embodiment of the invention.

Figure 5: A combined cross-sectional view of a fifth embodiment of the invention.

Fig. 6: A combined cross-sectional view of a sixth embodiment of the invention.

Figure 7: A combined cross-sectional view of a seventh embodiment of the invention.

Figure 8: A combined cross-sectional view of an eighth embodiment of the invention.

In order to make the above and other objects, features and advantages of the present invention more obvious and understandable, the preferred embodiments of the present invention are described below in conjunction with the attached drawings, which are described in detail as follows: Please refer to FIG. A first embodiment of a coaxial double ceiling fan of the present invention. The coaxial double ceiling fan includes a central shaft 1, a first ceiling fan group 2 and a second ceiling fan group 3. The first ceiling fan group 2 and the second ceiling fan group 3 are combined in The central axis 1.

Please refer to FIG. 1, the central shaft 1 extends through the first ceiling fan group 2 and the second ceiling fan group 3, and the central shaft 1 has an enlarged diameter section 11 formed with an upper shoulder 111 and Next to the shoulder portion 112, the enlarged diameter section 11 is formed in one piece.

Please refer to FIG. 1, the first ceiling fan group 2 is coupled to the central shaft 1, the first ceiling fan group 2 has a first stator 21 and a first rotor 22, and the first stator 21 is fixedly coupled to the center The shaft 1, the first rotor 22 is rotatably coupled to the central shaft 1, and the first stator 21 of the first ceiling fan group 2 is disposed above the first rotor 22, in addition, the first ceiling fan group 2 has a A first bearing group 23 and a first positioning member 24. The first bearing group 23 has an upper bearing 231 and a lower bearing 232. The first positioning member 24 is sleeved on the central shaft 1 and abuts and fixes the upper bearing 231 Between the lower bearing 232, in this embodiment, the first positioning member 24 is a sleeve 241, and the sleeve 241 is preferably positioned on the central axis by clamping or locking. In addition, The first ceiling fan group 2 also has a first fan blade 25 which is coupled to the lower surface of the first ceiling fan group 2.

Please refer to FIG. 1, the second ceiling fan group 3 is coupled to the central axis 1, the second ceiling fan group 3 has a second stator 31 and a second rotor 32, and the second stator 31 is fixedly coupled to The central shaft 1 and the second rotor 32 are rotatably coupled to the central shaft 1, and the second stator 31 of the second ceiling fan group 3 is disposed above the second rotor 32. In addition, the second ceiling fan group 3 has A second bearing set 33 and a second elastic member 36, the second bearing set 33 has an upper bearing 331 and a lower bearing 332, the upper bearing 331 is positioned on the shoulder 111 above the enlarged diameter section 11, the lower bearing 332 is coupled to the central shaft 1, the second elastic member 36 is disposed on the central shaft 1 and abuts between the shoulder 112 under the central shaft 1 and the bearing 332 under the second bearing set 33, so that the second The elastic member 36 can produce a pre-pressure effect on the second bearing group 33. In addition, the second ceiling fan group 3 also has a second fan blade 35 which is combined with the second ceiling fan group 3 lower surface.

In particular, the first ceiling fan group 2 and the second ceiling fan group 3 can alternately rotate (ie, one rotates and the other does not rotate), the rotation direction of the first ceiling fan group 2 and the second ceiling fan group The rotation direction 3 may be different, the rotation speed of the first ceiling fan group 2 and the rotation speed of the second ceiling fan group 3 may be different, the color of the first fan blade 25 and the color of the second fan blade 35 may be different, the The outer diameter of the first blade 25 and the outer diameter of the second blade 35 may be different, and the shape of the first blade 25 and the shape of the second blade 35 may be different. In this way, the first ceiling fan group 2 and the second ceiling fan group 3 can generate different wind speeds, wind directions, air volumes and action ranges, and distinguish the functionality by color, thereby achieving the effect of elastic application.

Also, please refer to FIG. 1, the coaxial double ceiling fan may further include a divider 4, the divider 4 is sleeved on the central axis 1, and the divider 4 abuts the first ceiling fan group 2 and the first The two ceiling fan groups 3 are used to isolate the first ceiling fan group 2 and the second ceiling fan group 3, which can ensure the effect of a certain safety distance between the first ceiling fan group 2 and the second ceiling fan group 3, wherein, The partition 4 is preferably a sleeve, and in order to increase its stability, the partition 4 can be locked by a fixing element (not shown) so that the partition 4 can be fixed to the central axis 1 on.

Please refer to FIG. 1, according to the aforementioned structure, the central shaft 1 is used to form a design with an enlarged diameter section 11. When assembling the coaxial double ceiling fan, the second ceiling fan assembly 3 is first assembled to make the second bearing The upper bearing 331 and the lower bearing 332 of the group 33 are respectively composed of two of the central shaft 1 The end is inserted, and the bearing 331 on the second bearing group 33 is directly positioned on the upper shoulder 111. After the assembly and positioning of the second ceiling fan group 3 is completed, the assembly operation of the first ceiling fan group 2 is performed by Therefore, the enlarged diameter section 11 can bear the weight of the second ceiling fan group 3, and the second ceiling fan group 3 can quickly and conveniently complete positioning and assembly, thereby saving assembly time and cost of the overall coaxial double ceiling fan.

Please refer to FIG. 2, which is the second embodiment of the coaxial double ceiling fan of the present invention. The second embodiment of the present invention is substantially the same as the first embodiment described above. The main difference is that the second ceiling fan group 3 is not provided. With the second elastic member 36, the bearing 332 under the second bearing set 33 directly abuts and fixes the shoulder 112 under the central shaft 1, and the second stator 31 of the second ceiling fan set 3 is disposed on the second rotor 32 below, and the second fan blade 35 is coupled to the upper surface of the second ceiling fan group 3; thereby, in addition to being able to provide different wind-driving effects on the same axis and different axial heights, the coaxial double is assembled In the case of a ceiling fan, the bearing 332 under the second bearing set 33 can be directly positioned on the shoulder 112 under the central shaft 1, so that the second ceiling fan set 3 can be positioned and assembled more quickly and more conveniently, and thus more Save the assembly time and cost of the whole coaxial double ceiling fan.

Please refer to FIG. 3, which is the third embodiment of the coaxial double ceiling fan of the present invention. The third embodiment of the present invention is substantially the same as the first embodiment described above, and the main difference is that the first ceiling fan group 2 and the The partition 4 is not provided between the second ceiling fan group 3, the first stator 21 of the first ceiling fan group 2 is disposed below the first rotor 22, and the first fan blade 25 is combined with the first ceiling fan The upper surface of group 2; by this, the system can provide different wind-driving effects on the same axis and different axial heights.

Please refer to FIG. 4, which is the fourth embodiment of the coaxial double ceiling fan of the present invention. The fourth embodiment of the present invention is substantially the same as the second embodiment described above. The main difference is that the first fan blade 25 is combined On the upper surface of the first ceiling fan group 2, the first stator 21 of the first ceiling fan group 2 is disposed below the first rotor 22, and the second stator 31 of the second ceiling fan group 3 is disposed on the second rotor 32 Below; by this, the system can provide different wind drive on the same axis and different axial heights effect.

Please refer to FIG. 5, which is the fifth embodiment of the coaxial double ceiling fan of the present invention. The fifth embodiment of the present invention is substantially the same as the first embodiment described above. The main difference is that the fifth embodiment of the present invention is based on The first ceiling fan group 2 cooperates with the enlarged diameter section 11 of the central shaft 1.

Please refer to FIG. 5, wherein a first elastic member 26 of the first ceiling fan group 2 is disposed on the central shaft 1 and abuts and fixes the shoulder 112 under the central shaft 1 and the first bearing group 23 Between the bearings 232, in addition, a second positioning member 34 of the second ceiling fan group 3 is disposed between the upper bearing 331 and the lower bearing 332 and abuts and fixes the upper bearing 331, the second positioning member 34 may be It is a sleeve 341 or a positioning pin 342 or a sleeve 341 combined with a positioning pin 342. In this embodiment, the second positioning member 34 is a sleeve 341 combined with a positioning pin 342, and the second elasticity The member 36 abuts between the second positioning member 34 and the lower bearing 332 of the second bearing group 33.

Please refer to FIG. 5, according to the aforementioned structure, the central shaft 1 is used to form a design with an enlarged diameter section 11. When assembling the coaxial double ceiling fan, the first ceiling fan group 2 is first assembled to make the first bearing The upper bearing 231 and the lower bearing 232 of the group 23 are sleeved from both ends of the central shaft 1, respectively, and the upper bearing 231 of the first bearing group 23 is directly positioned on the upper shoulder 111, and the first ceiling fan group is to be completed 2 After the assembly and positioning, the second ceiling fan group 3 is assembled, whereby the enlarged diameter section 11 can bear the weight of the first ceiling fan group 2, and the first ceiling fan group 2 can be completed quickly and conveniently Positioning and assembly, which can save the assembly time and cost of the overall coaxial double ceiling fan.

Please refer to FIG. 6, which is the sixth embodiment of the coaxial double ceiling fan of the present invention. The sixth embodiment of the present invention is substantially the same as the fifth embodiment described above. The main difference is that the second ceiling fan group 3 is not provided. With the second elastic member 36, the bearing 332 under the second bearing group 33 is directly positioned at the bottom end of the second positioning member 34, and the second stator 31 of the second ceiling fan group 3 is disposed under the second rotor 32 , And the second fan blade 35 is coupled to the upper surface of the second ceiling fan group 3; thereby, in addition to being able to provide different wind-driving effects on the same axis and different axial heights, in the group When the coaxial double ceiling fan is installed, the bearing 332 under the second bearing set 33 can be directly positioned at the bottom end of the second positioning member 34, so that the second ceiling fan set 3 can also be quickly and conveniently positioned and assembled, and It can save the assembly time and cost of the whole coaxial double ceiling fan.

Please refer to FIG. 7, which is the seventh embodiment of the coaxial double ceiling fan of the present invention. The seventh embodiment of the present invention is substantially the same as the fifth embodiment described above. The main difference is that the first ceiling fan group 2 is not provided. With the first elastic member 26, the bearing 232 under the first bearing group 23 is directly positioned at the shoulder 112 under the central shaft 1, and the first blade 25 is coupled to the upper surface of the first ceiling fan group 2 , The first stator 21 of the first ceiling fan group 2 is disposed below the first rotor 22, and the partition 4 is not provided between the first ceiling fan group 2 and the second ceiling fan group 3; In addition to providing different wind-driving effects on the same shaft and different axial heights, when assembling the coaxial double ceiling fan, the bearing 232 under the first bearing group 23 can be directly positioned on the shoulder 112 under the central shaft 1, As a result, the first ceiling fan group 2 can complete positioning and assembly more quickly and more conveniently, thereby further saving the assembly time and cost of the overall coaxial double ceiling fan.

Please refer to FIG. 8, which is an eighth embodiment of the coaxial double ceiling fan of the present invention. The eighth embodiment of the present invention is substantially the same as the fifth embodiment described above. The main difference is that the first ceiling fan group 2 is not provided. With the first elastic member 26, the bearing 232 under the first bearing set 23 is directly positioned at the shoulder 112 under the central shaft 1, and the first stator 21 of the first ceiling fan set 2 is disposed at the first rotor 22, and the first fan blade 25 is coupled to the upper surface of the first ceiling fan group 2, the second fan blade 35 is coupled to the upper surface of the second ceiling fan group 3, in addition, the second ceiling fan group 3 The second elastic member 36 is not provided, and the bearing 332 under the second bearing group 33 is directly positioned at the bottom end of the second positioning member 34; thereby, in addition to providing different drives on the same shaft and different axial heights In addition to the effect of wind, when assembling the coaxial double ceiling fan, the bearing 232 under the first bearing set 23 can be directly positioned on the shoulder 112 under the central shaft 1, and the bearing 332 under the second bearing set 33 can be directly Positioning at the bottom end of the second positioning member 34 makes the first bearing group 23 and the second bearing group 33 series faster More conveniently locate the assembly and thus can save more coaxially integrally hanging bis Fan assembly time and cost.

In summary, the coaxial double ceiling fan of the present invention utilizes the design of the central shaft with an enlarged diameter section, which can directly bear the weight of one of the ceiling fan groups, and can quickly complete the positioning and assembly of the ceiling fan group. It can save the assembly time and cost of the overall coaxial double ceiling fan, and improve the efficiency of practical safety.

Although the present invention has been disclosed using the above preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art without departing from the spirit and scope of the present invention, making various changes and modifications with respect to the above embodiments still belongs to the present invention. The technical scope of the invention is protected, so the scope of protection of the present invention shall be deemed as defined by the scope of the attached patent application.

Claims (27)

A coaxial double ceiling fan includes: a central shaft with an enlarged diameter section formed with an upper shoulder and a lower shoulder; a first ceiling fan group with a first stator and a first rotor, the The first stator is fixedly coupled to the central axis, the first rotor is rotatably coupled to the central axis, the first ceiling fan group has a first bearing group and a first fan blade, the first fan blade is coupled to the A first rotor; and a second ceiling fan set having a second stator and a second rotor, the second stator is fixedly coupled to the central axis, the second rotor is rotatably coupled to the central axis, the second ceiling fan The group has a second bearing group and a second blade, the second blade is combined with the second rotor; wherein, the second bearing group has an upper bearing and a lower bearing, the upper bearing is positioned at the enlarged diameter section On the upper shoulder, the lower bearing is coupled to the central axis. The coaxial double ceiling fan as described in item 1 of the patent scope, wherein the first ceiling fan group has a first positioning member, the first positioning member is sleeved on the central shaft and abuts and fixes on the first bearing group Between the bearing and the lower bearing. The coaxial double ceiling fan as described in item 2 of the patent application scope, wherein the first positioning member is a sleeve or a positioning pin or a sleeve combined with a positioning pin. The coaxial double ceiling fan as described in item 3 of the patent application scope, wherein the sleeve is positioned on the central axis in a clamping or locking manner. The coaxial double ceiling fan according to item 1 of the patent application scope, wherein the first fan blade is coupled to the lower surface of the first ceiling fan group, and the second fan blade is coupled to the lower surface of the second ceiling fan group. The coaxial double ceiling fan according to item 1 of the patent application scope, wherein the first fan blade is combined with the lower surface of the first ceiling fan group, and the second fan blade is combined with the upper surface of the second ceiling fan group. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the first fan blade is coupled to the upper surface of the first ceiling fan group, and the second fan blade is coupled to the lower surface of the second ceiling fan group. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the first fan blade is coupled to the upper surface of the first ceiling fan group, and the second fan blade is coupled to the upper surface of the second ceiling fan group. The coaxial double ceiling fan as described in item 5 or 7 of the patent application scope, wherein the second ceiling fan group has a second elastic member disposed on the central axis and abutting the shoulder under the central axis Between the bearings below the second bearing set. The coaxial double ceiling fan as described in item 5 or 6 of the patent application scope, further includes a divider, the divider is sleeved on the central shaft and respectively abuts the first ceiling fan group and the second ceiling fan group. The coaxial double ceiling fan as described in item 1 of the patent scope, wherein the first bearing set has an upper bearing and a lower bearing, the upper bearing is positioned at the shoulder above the enlarged diameter section, and the lower bearing is coupled to the central shaft . The coaxial double ceiling fan as recited in item 11 of the patent application range, wherein the first fan blade is coupled to the lower surface of the first ceiling fan group, and the second fan blade is coupled to the lower surface of the second ceiling fan group. The coaxial double ceiling fan as recited in item 11 of the patent application range, wherein the first fan blade is coupled to the upper surface of the first ceiling fan group, and the second fan blade is coupled to the upper surface of the second ceiling fan group. The coaxial double ceiling fan as recited in item 11 of the patent application range, wherein the first fan blade is coupled to the lower surface of the first ceiling fan group, and the second fan blade is coupled to the upper surface of the second ceiling fan group. The coaxial double ceiling fan as recited in item 11 of the patent application range, wherein the first fan blade is coupled to the upper surface of the first ceiling fan group, and the second fan blade is coupled to the lower surface of the second ceiling fan group. The coaxial double ceiling fan as described in item 12 or 15 of the patent application scope, wherein the second ceiling fan group has a second elastic member, the second elastic member is disposed on the central axis and abuts the second positioning member and the Between the bearings under the second bearing set. The coaxial double ceiling fan according to any one of the items 12, 13, and 14 of the patent application scope, which further includes a divider, the divider is sleeved on the central axis and respectively abuts the first ceiling fan group and the The second ceiling fan group. The coaxial double ceiling fan as described in item 12 or 14 of the patent application scope, wherein the first ceiling fan group has a first elastic member disposed on the central axis and abutting the shoulder under the central axis Between the bearings below the first bearing set. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the first ceiling fan group and the second ceiling fan group rotate alternately. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the first ceiling fan group and the second ceiling fan group rotate in different directions. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the rotation speed of the first ceiling fan group and the rotation speed of the second ceiling fan group are different. The coaxial double ceiling fan as described in item 1 of the patent scope, wherein the color of the first fan blade and the color of the second fan blade are different. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the outer diameter of the first blade and the outer diameter of the second blade are different. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the shape of the first blade and the shape of the second blade are different. The coaxial double ceiling fan as described in item 1 of the patent application scope, wherein the forming method of the enlarged diameter section is integrally formed. A coaxial double ceiling fan includes: a central shaft with an enlarged diameter section formed with an upper shoulder and a lower shoulder; a first ceiling fan group with a first stator and a first rotor, the The first stator is fixedly coupled to the central axis, the first rotor is rotatably coupled to the central axis, the first ceiling fan group has a first bearing group and a first fan blade, the first fan blade is coupled to the A first rotor, the first bearing set has an upper bearing and a lower bearing, the upper bearing is positioned at a shoulder above the enlarged diameter section, the lower bearing is coupled to the central shaft; and a second ceiling fan set has a first Two stators and a second rotor, the second stator is fixedly coupled to the central axis, the second rotor is rotatably coupled to the central axis, the second ceiling fan group has a second bearing group and a second fan blade, The second fan blade is combined with the second rotor; wherein, the second ceiling fan group has a second positioning member, and the second positioning member is disposed between the upper bearing and the lower bearing of the second bearing group and abuts Secure the upper bearing. The coaxial double ceiling fan as described in Item 26 of the patent application range, wherein the second positioning member is a sleeve or a positioning pin or a sleeve combined with a positioning pin.