Ultra-thin double-sided independent transfer fan for seat ventilation

Abstract

The invention provides an ultra-thin double-sided independent transfer fan for seat ventilation, which comprises a mounting shell in which a first mounting space and a second mounting space which are coaxially stacked and communicate with each other are arranged, a first air guide part communicating with the first mounting space and a second air guide part communicating with the second mounting space are arranged on the peripheral side of the mounting shell; the pair of impellers are rotationally mounted in the first mounting space and the second mounting space respectively; the impeller in the first mounting space and the first air guide part form a first air blowing and sucking unit, and the impeller in the second mounting space and the second air guide part form a second air blowing and sucking unit; and the axial magnetic flux driving mechanism is used for independently driving the pair of impellers to rotate respectively. According to the fan, ventilation is conducted through the stacked double-layer impellers, the air volume of the integrated fan is increased, and the cooling efficiency of seat ventilation is effectively improved.

Description

Technical Field

[0001] The present disclosure generally relates to the technical field of seat ventilation, and in particular to an ultra-thin double-sided independent split fan for seat ventilation. Background Art

[0002] With the development of technology in the field of vehicle transportation, people have higher and higher requirements for vehicle riding comfort. Since the human body is in close contact with the seat, air circulation is blocked, which is not conducive to sweat discharge and makes the human body feel uncomfortable. The ventilation function effectively improves the air circulation between the human body and the seat, keeping the human body dry and comfortable.

[0003] At present, ventilation systems with only blowing or only sucking air are gradually unable to meet the passengers' requirements for comfort. At this time, the demand for blowing and sucking systems comes into being, but the air volume of the integrated blowing and sucking fans is small and cannot meet the cooling requirements of the ventilation system. Summary of the invention

[0004] In view of the above defects or deficiencies in the prior art, it is desirable to provide an ultra-thin double-sided independent split fan for seat ventilation to solve the above problems.

[0005] The present application provides an ultra-thin double-sided independent split fan for seat ventilation, comprising: An installation shell, wherein a first installation space and a second installation space are coaxially stacked and connected to each other, and a first air guide portion connected to the first installation space and a second air guide portion connected to the second installation space are respectively provided on the outer peripheral side of the installation shell; A pair of impellers, the pair of impellers are rotatably installed in the first installation space and the second installation space respectively; the impeller in the first installation space and the first air guide portion form a first blowing and suction unit, and the impeller in the second installation space and the second air guide portion form a second blowing and suction unit; An axial magnetic flux driving mechanism is used to independently drive a pair of impellers to rotate separately.

[0006] According to the technical solution provided in the embodiment of the present application, the mounting shell includes a central shell and a pair of first shells, the pair of first shells are respectively arranged on both sides of the central shell, the first mounting space is formed between one of the first shells and the central shell, and the second mounting space is formed between the other first shell and the central shell; the central shell is provided with a ventilation part for connecting the first mounting space and the second mounting space.

[0007] According to the technical solution provided in the embodiment of the present application, the axial magnetic flux driving mechanism includes: A pair of transmission shafts, wherein the pair of transmission shafts are rotatably installed in the first installation space and the second installation space through a pair of rotating components respectively, and the transmission shafts are coaxially arranged and fixedly connected with the impeller; A driving device is respectively mounted on a pair of the transmission shafts, and is used to independently drive the pair of the transmission shafts.

[0008] According to the technical solution provided in the embodiment of the present application, the rotating assembly includes: A copper middle tube, the copper middle tube is coaxially arranged with the transmission shaft, the copper middle tube is hollow inside and the two ends are connected; A pair of bearings are arranged in the copper middle tube and sleeved on the transmission shaft, and the inner rings of the bearings are fixedly connected to the side walls of the transmission shaft.

[0009] According to the technical solution provided in the embodiment of the present application, the rotating assembly also includes a pre-stressed elastic member, which is arranged between a pair of the bearings. The pre-stressed elastic member squeezes the bearings to eliminate the clearance between the balls in the bearings and the inner and outer rings.

[0010] According to the technical solution provided in the embodiment of the present application, the impeller includes a first convex working surface and a second concave working surface, and the first working surfaces of a pair of impellers are arranged close to each other.

[0011] According to the technical solution provided in the embodiment of the present application, the impeller includes a first convex working surface and a second concave working surface, and a pair of the second working surfaces of the impellers are arranged close to each other.

[0012] According to the technical solution provided in the embodiment of the present application, the central shell includes a pair of second shells, the pair of second shells are connected by a sealing shock-absorbing component, and the pair of second shells respectively form the first installation space or the second installation space with the first shell on the corresponding side.

[0013] According to the technical solution provided in the embodiment of the present application, the driving device includes two driving units, and the two driving units are respectively used to drive a pair of transmission shafts, and the driving units include: Circuit boards; A hollow coil, the hollow coil is mounted on the circuit board and sleeved on the corresponding transmission shaft, and the hollow coil is electrically connected to the circuit board; The rotating magnet is arranged on a side of the hollow coil away from the circuit board, and is sleeved on the corresponding transmission shaft and fixed to the transmission shaft.

[0014] According to the technical solution provided in the embodiment of the present application, the driving device includes a driving unit, and the driving unit is used to drive a pair of the transmission shafts respectively, and the driving unit includes: Circuit boards; A pair of hollow coils, wherein the pair of hollow coils are respectively arranged on both sides of the circuit board and fixed to the circuit board, and the pair of hollow coils are both electrically connected to the circuit board; A pair of rotating magnets, wherein the pair of rotating magnets are respectively arranged on one side of a pair of hollow coils away from the circuit board, and the pair of rotating magnets are respectively sleeved on the corresponding transmission shafts and fixed to the corresponding transmission shafts.

[0015] Compared with the prior art, the beneficial effects of the present application are: by setting a mounting shell, an entrance space and a second mounting space are formed inside the mounting shell, the first mounting space and the second mounting space are connected to each other, a first air guide portion is set on the circumferential side of the mounting shell corresponding to the first mounting space, and a second air guide portion is set on the circumferential side of the mounting shell corresponding to the second mounting space, the first mounting space and the second mounting space are provided with impellers, and when the impeller is driven to rotate by the circumferential magnetic flux driving mechanism, a suction effect is generated at the position of the first air guide portion through the wind guiding action of the impeller, and a blowing effect is generated at the position of the second air guide portion, thereby achieving that a fan has both suction and blowing effects on the same side; and the stacking of the two impellers effectively reduces the thickness of the fan, reduces the size of the fan, and thereby improves the installation adaptability of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 1; Figure 2 for Figure 1 A front view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Figure 3 for Figure 1 An exploded view of the ultra-thin double-sided independent split fan for seat ventilation is shown; Figure 4 for Figure 1 A cross-sectional view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Figure 5 This is a schematic diagram of the installation structure of the fan and the seat; Figure 6 A schematic diagram of the structure of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 2; Figure 7 for Figure 6A front view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Figure 8 for Figure 6 An exploded view of the ultra-thin double-sided independent split fan for seat ventilation is shown; Fig. 9 for Figure 6 A cross-sectional view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Fig.10 A schematic diagram of the structure of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 3; Fig.11 for Fig.10 An exploded view of the ultra-thin double-sided independent split fan for seat ventilation is shown; Fig.12 for Fig.10 A cross-sectional view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Fig.13 A schematic diagram of the structure of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 4; Fig.14 for Fig.13 An exploded view of the ultra-thin double-sided independent split fan for seat ventilation is shown; Fig.15 for Fig.13 A cross-sectional view of an ultra-thin double-sided independent split fan for seat ventilation is shown; Fig.16 An exploded view of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 5; Fig.17 A cross-sectional view of an ultra-thin double-sided independent split fan for seat ventilation provided in Example 5.

[0017] Figure numbers: 1. first air guide part; 2. second air guide part; 3. impeller; 3-1. first working surface; 3-2. second working surface; 4. first shell; 5. center shell; 5-1. second shell; 6. ventilation part; 7. transmission shaft; 8. circuit board; 9. hollow coil; 10. rotating magnet; 11. sealing shock absorber; 12. rotating assembly; 13. copper middle tube; 14. bearing; 15. pre-stressed elastic part; 16. rotor frame; 17. first air outlet; 18. second air outlet; 19. C retaining ring; 20. copper cap; 21. protrusion; 22. fixing plate; 23. seat; 24. seat spring frame; 25. rivet; 26. reinforcing rib; 27. groove. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0019] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0020] Example 1 Please refer to Figure 1-Figure 4 The present application provides an ultra-thin double-sided independent split fan for seat ventilation, comprising: An installation shell, wherein a first installation space and a second installation space are coaxially stacked and connected to each other, and a first air guide portion 1 connected to the first installation space and a second air guide portion 2 connected to the second installation space are respectively provided on the outer circumference of the installation shell; A pair of impellers 3, the pair of impellers 3 are rotatably installed in the first installation space and the second installation space respectively; the impeller 3 in the first installation space and the first air guide portion 1 form a first blowing and suction unit, and the impeller 3 in the second installation space and the second air guide portion 2 form a second blowing and suction unit; The circumferential magnetic flux driving mechanism, the axial magnetic flux driving mechanism is used to independently drive a pair of impellers 3 to rotate separately.

[0021] Specifically, a first installation space and a second installation space are formed inside the installation shell in the axial direction, the first installation space and the second installation space are stacked, the first installation space and the second installation space are connected to each other, and an impeller 3 is rotatably installed in each of the first installation space and the second installation space. The two impellers 3 arranged in the first installation space and the second installation space are coaxially arranged, and both are driven to rotate by an axial magnetic flux driving mechanism. The first air guide portion 1 is a plurality of openings formed on the outer peripheral side of the installation shell, and the plurality of openings are distributed around the first installation space, and the openings are connected to the first installation space; the second air guide portion 1 is a plurality of openings formed on the outer peripheral side of the installation shell, and the plurality of openings are distributed around the second installation space, and the openings are connected to the second installation space.

[0022] Specifically, the fan provided in the present application has different working modes, and the air suction or blowing effect can be achieved by driving the two impellers 3 separately. When only the impeller 3 in the first installation space is driven to rotate, the impeller 3 in the first installation space is used to suck the air outside the installation shell into the first installation space by the first air guide 1, and then guide it to the second installation space, the impeller 3 in the second installation space moves or remains stationary, and the air in the second installation space is blown out by the second air guide 2, thereby achieving the effect of suction at the first air guide 1 position and blowing at the second air guide 2 position. When only the impeller 3 in the second installation space is driven to rotate, the air outside the installation shell is sucked into the first installation space by the first air guide 1 under the driving action of the impeller 3, the impeller 3 in the first installation space moves or remains stationary, and then the air is guided from the first installation space to the second installation space and blown out by the second air guide 2, which can also achieve the effect of suction at the first air guide 1 position and blowing at the second air guide 2 position.

[0023] Furthermore, the impeller 3 includes an outwardly convex first working surface 3 - 1 and an inwardly concave second working surface 3 - 2 , and a pair of first working surfaces 3 - 1 of the impeller 3 are arranged close to each other.

[0024] Specifically, the impeller 3 includes a convex surface and a concave surface, wherein the convex surface is the front surface and serves as the first working surface 3-1, and the concave surface is the back surface and serves as the second working surface 3-2; a circle of reinforcing ribs 26 are provided on the first working surface 3-1 and the second working surface 3-2 of the impeller 3, and a plurality of grooves 27 are formed on the reinforcing ribs 26 along the circumferential direction; a first air port 17 is provided on the second working surface 3-2 of the impeller 3, and a plurality of second air ports 18 are formed on the outer peripheral side of the impeller 3, and the second air ports 18 are connected to the first air ports 17. The first air ports 17 of the impeller 3 in the first installation space and the first air ports 17 of the impeller 3 in the second installation space are arranged correspondingly, the second air ports 18 of the impeller 3 in the first installation space are arranged correspondingly to the position of the first air guide portion 1, and the second air ports 18 of the impeller 3 in the second installation space are arranged correspondingly to the position of the second air guide portion 2.

[0025] In this embodiment, the first working surfaces 3-1 of a pair of impellers 3 are arranged close to each other. When the impeller 3 in the first installation space rotates, air enters through the second air outlet 18 of the impeller 3 in the second installation space, and air is discharged through the first air outlet 17 of the impeller 3 in the second installation space, and then enters the first air outlet 17 of the impeller 3 in the first installation space, and then air is discharged through the second air outlet 18 of the impeller 3 in the first installation space, thereby the impeller 3 in the first installation space and the first air guide portion 1 form a blowing unit, and the impeller 3 in the second installation space and the second air guide portion 2 form a suction unit; when the impeller 3 in the second installation space rotates, air enters through the second air outlet 18 of the impeller 3 in the first installation space, and air is discharged through the first air outlet 17 of the impeller 3 in the first installation space, then enters the first air outlet 17 of the impeller 3 in the second installation space, and then air is discharged through the second air outlet 18 of the impeller 3 in the second installation space, thereby the impeller 3 in the second installation space and the second air guide portion 2 form a blowing unit, and the impeller 3 in the first installation space and the first air guide portion 2 form a suction unit.

[0026] The air enters through the first air port 17 and exits through the second air port 18. In this embodiment, the fan is in the form of a pair of impellers 3 facing each other.

[0027] The fan provided in this embodiment can achieve suction and blowing effects at any position of the fan circumference, and can meet the suction and blowing requirements of the seat ventilation system; because the two impellers 3 in the fan provided in this embodiment are coaxially stacked, the suction and blowing effects of the fan are increased, thereby meeting the seat ventilation system's requirements for cooling efficiency; in addition, the stacking of the two impellers 3 in the mounting shell effectively reduces the thickness of the mounting shell, so that the fan can be more conveniently used in the seat ventilation system, meeting the demand for miniaturization of the fan.

[0028] like Figure 5 As shown, Figure 5 The fan provided in this embodiment is shown at A in the middle. The fan provided in this embodiment is installed on the seat 23 of the car to ventilate the seat 23. Half of the fan is placed in the air bag on the seat 23, and the other half is placed outside the seat 23. The fan can be directly fixed to the seat 23, or fixed to the seat spring frame 24 through a rivet 25. The seat spring frame 24 is fixed to the seat 23. In this embodiment, the fan on one side embedded in the air bag is used as a blowing fan. When turned on, the seat ventilation is in a blowing mode; the fan on the one side outside the air bag is used as a suction fan. When turned on, the seat ventilation is in a suction mode.

[0029] Furthermore, the mounting shell includes a central shell 5 and a pair of first shells 4, and the pair of first shells 4 are respectively arranged on both sides of the central shell 5, wherein the first mounting space is formed between one of the first shells 4 and the central shell 5, and the second mounting space is formed between the other first shell 4 and the central shell 5; and a ventilation portion 6 for connecting the first mounting space and the second mounting space is provided on the central shell 5.

[0030] Specifically, in this embodiment, the center shell 5 is an integrated structure, and a plurality of snap-in holes are provided on the outer peripheral side of the center shell 5. The snap-in columns are provided on the outer peripheral side of the first shell 4 corresponding to the snap-in holes. The first shell 4 can be installed on both sides of the center shell 5 through the cooperation of the snap-in columns and the snap-in holes. The center shell 5 cooperates with the first shells 4 on both sides to form a first installation space and a second installation space on both sides of the center shell 5. A ventilation part 6 is provided at the center of the center shell 5, and the ventilation part 6 runs through both sides of the center shell 5 to achieve the connection between the first installation space and the second installation space. In this embodiment, setting the center shell 5 as an integrated structure can effectively reduce the overall thickness of the fan, thereby improving the adaptability of the fan during installation.

[0031] In this embodiment, since the convex surfaces of the two impellers 3 are arranged close to each other, the sides of the pair of first housings 4 close to the impellers 3 are both arranged to be flat to accommodate the installation of the impellers 3 .

[0032] Furthermore, the axial magnetic flux driving mechanism comprises: A pair of transmission shafts 7, wherein the pair of transmission shafts 7 are respectively installed in the first installation space and the second installation space through a pair of rotating components 12, and the transmission shafts 7 are coaxially arranged and fixedly connected with the impeller 3; The driving device is respectively mounted on a pair of the transmission shafts 7 , and is used to independently drive the pair of the transmission shafts 7 .

[0033] Specifically, the axial magnetic flux drive mechanism includes a driving device and a pair of transmission shafts 7, the pair of transmission shafts 7 are coaxially arranged and rotatably installed in the first installation space and the second installation space respectively. In this embodiment, the end of the transmission shaft 7 close to the first housing 4 realizes relative rotation with the first housing 4 through the rotating assembly 12, the transmission shaft 7 and the rotating assembly 12 are rotatably connected, and the rotation direction is around the axis direction of the transmission shaft 7, and the rotating assembly 12 is sleeved on the transmission shaft 7; the end of the transmission shaft 7 close to the center housing 5 realizes relative rotation with the center housing 5 through the copper cap 20, the transmission shaft 7 and the copper cap 20 are rotatably connected, and the rotation direction is around the axis direction of the transmission shaft 7; the transmission shaft 7 and the impeller 3 are coaxially arranged and fixed to each other. In this embodiment, since the pair of impellers 3 are arranged face to face, the driving device is installed on the center housing 5, and the driving device is sleeved on the pair of transmission shafts 7 respectively. The driving device can independently drive the pair of transmission shafts 7 to rotate respectively, and then drive the pair of impellers 3 to rotate respectively.

[0034] Further, the driving device includes two driving units, and the two driving units are respectively used to drive a pair of transmission shafts 7, and the driving units include: Circuit board 8; A hollow coil 9, wherein the hollow coil 9 is mounted on the circuit board 8 and sleeved on the corresponding transmission shaft 7, and the hollow coil 9 is electrically connected to the circuit board 8; The rotating magnet 10 is disposed on a side of the air-core coil 9 away from the circuit board 8 , and is sleeved on the corresponding transmission shaft 7 and fixed to the transmission shaft 7 .

[0035] Specifically, in this embodiment, the driving device includes two driving units, each of which includes a circuit board 8, a hollow coil 9 and a rotating magnet 10. In this embodiment, the circuit board 8 is sleeved on the outside of the rotating assembly 12, and then sleeved on the transmission shaft 7. The hollow coil 9 is installed on the circuit board 8 and electrically connected to the circuit board 8. The hollow coil 9 is arranged on the side of the circuit board 8 close to the central housing 5. The hollow coil 9 is also sleeved on the outside of the rotating assembly 12. The rotating magnet 10 is arranged on the side of the hollow coil 9 close to the central housing 5 and sleeved on the transmission shaft 7. The rotating magnet 10 is fixedly connected to the transmission shaft 7 through the rotor frame 16, and the rotor frame 16 is shown in the accompanying drawings of this embodiment. After the hollow coil 9 is energized by the circuit board 8, the magnetic field generated by the hollow coil 9 drives the rotating magnet 10 to rotate around the axis of the transmission shaft 7, realizing the driving effect of the axial magnetic flux, and then driving the transmission shaft 7 and the impeller 3 to rotate. In this embodiment, the rotating magnet 10 can be selected as a neodymium iron boron magnet. The reason why the hollow coil 9 is selected for driving in this embodiment is to realize the purpose of driving by axial magnetic flux by using the hollow coil 9 in cooperation with the rotating magnet 10. In this embodiment, the two sets of hollow coils 9 are controlled by two circuit boards 8, and the power on and off of the two hollow coils 9 do not affect each other.

[0036] Furthermore, the rotating assembly 12 includes: A copper middle tube 13, wherein the copper middle tube 13 is coaxially arranged with the transmission shaft 7, and the copper middle tube 13 is hollow inside and connected at both ends; A pair of bearings 14 are disposed in the copper middle tube 13 and sleeved on the transmission shaft 7 , and the inner rings of the bearings 14 are fixedly connected to the side walls of the transmission shaft 7 .

[0037] Specifically, the rotating assembly 12 includes a copper tube 13 and a pair of bearings 14. The copper tube 13 is hollow inside and connected at both ends. The pair of bearings 14 are installed in the copper tube 13 and distributed near the two ends of the copper tube 13. The outer ring of the bearing 14 is clamped in the copper tube 13. The inner ring of the bearing 14 is sleeved on the transmission shaft 7 and fixed to the transmission shaft 7. In this embodiment, the copper tube 13 is fixedly installed on the first housing 4. By setting the rotating assembly 12, the resistance of the rotational friction between the transmission shaft 7 and the first housing 4 is smaller and the rotation efficiency is higher. The transmission shaft 7 and the copper tube 13 are also connected by a C-ring 19.

[0038] Furthermore, the rotating assembly 12 also includes a preload elastic member 15 , which is disposed between a pair of the bearings 14 , and the preload elastic member 15 squeezes the bearings 14 to eliminate the clearance between the balls inside the bearings 14 and the inner and outer rings.

[0039] Specifically, the inner ring of the bearing 14 at one end of the copper middle tube 13 near the copper cap 20 abuts against the copper cap 20, and a circle of protrusions 21 is provided at a position near the copper cap 20 in the copper middle tube 13. The protrusions 21 abut against the outer ring of the bearing 14 at one end of the copper middle tube 13 near the copper cap 20, and the protrusions 21 are elastic; the inner ring of the bearing 14 at one end of the copper middle tube 13 away from the copper cap 20 abuts against the C retaining ring 19. The preload elastic member 15 is retractable along the extension direction of the transmission shaft 7. Optionally, the preload elastic member 15 is a spring. One end of the preload elastic member 15 abuts against the outer ring of the bearing 14 away from the copper cap 20, and the other end abuts against the protrusion 21. The preload elastic member 15 is squeezed in the copper middle tube 13, so that the preload elastic member 15 applies pressure to both ends respectively, thereby making the inner rings and outer rings of the two bearings 14 misaligned with each other, reducing the clearance between the balls in the bearing 14 and the inner and outer rings, ensuring that the balls in the bearing 14 can effectively contact the inner and outer rings, thereby achieving the purpose of low vibration and low noise.

[0040] Example 2 Based on the above-mentioned embodiment 1, this embodiment provides another ultra-thin double-sided independent split fan for seat ventilation. The same contents as those of embodiment 1 are not repeated here. The difference lies in that: The impeller 3 includes an outwardly convex first working surface 3 - 1 and an inwardly concave second working surface 3 - 2 , and a pair of the second working surfaces 3 - 2 of the impeller 3 are arranged close to each other.

[0041] like Figure 6-Figure 9 As shown, in this embodiment, the second working surfaces 3-2 of a pair of impellers 3 are arranged close to each other, and the groove 27 located on the second working surface 3-2 is a through hole connecting the first working surface 3-1 and the second working surface 3-2 of the same impeller 3, and is respectively connected to the first air outlet 17 and the second air outlet 18; when the impeller 3 in the first installation space rotates, air enters from the second air outlet 18 of the impeller 3 in the second installation space, and air exits from the groove 27 located on one side of the second working surface 3-2 of the impeller 3 in the second installation space, and then enters the first air outlet 18 of the impeller 3 in the second installation space. The impeller 3 in the first installation space is located in the groove 27 on the side of the second working surface 3-2, and then the air is discharged from the second air outlet 18 of the impeller 3 in the first installation space; when the impeller 3 in the second installation space rotates, the air enters through the second air outlet 18 of the impeller 3 in the second installation space, and the air is discharged from the groove 27 on the side of the second working surface 3-2 of the impeller 3 in the first installation space, and then enters the groove 27 on the side of the second working surface 3-2 of the impeller 3 in the second installation space, and then the air is discharged from the second air outlet of the impeller 3 in the second installation space.

[0042] In this embodiment, since the concave surfaces of the two impellers 3 are arranged close to each other, the side of a pair of first shells 4 close to the impeller 3 is arranged to be a concave surface adapted to the impeller 3. The fan in this embodiment is in the form of a pair of impellers 3 back to back.

[0043] Furthermore, the driving device comprises a driving unit, wherein the driving unit is used to drive a pair of the transmission shafts 7 respectively, and the driving unit comprises: Circuit board 8; a pair of hollow coils 9, wherein the pair of hollow coils 9 are respectively disposed on both sides of the circuit board 8 and fixed to the circuit board 8, and the pair of hollow coils 9 are both electrically connected to the circuit board 8; A pair of rotating magnets 10 , wherein the pair of rotating magnets 10 are respectively arranged on one side of a pair of hollow coils 9 away from the circuit board 8 , and the pair of rotating magnets 10 are respectively sleeved on the corresponding transmission shafts 7 and fixed to the corresponding transmission shafts 7 .

[0044] Specifically, in this embodiment, a pair of transmission shafts 7 are also driven by a hollow coil 9 and a rotating magnet 10 respectively. Different from the above-mentioned embodiment 1, only one circuit board 8 is provided in this embodiment. The circuit board 8 is installed in the center housing 5 and fixed to the center housing 5. Two hollow coils 9 are respectively provided on both sides of the circuit board 8, and the hollow coils 9 are fixed by a fixing plate 22. In this embodiment, the two hollow coils 9 are independently controlled to be powered on and off by a circuit board 8, so as to realize the driving of a pair of transmission shafts 7 respectively. By integrating the control circuits of the two hollow coils 9 on a circuit board 8, the space in the fan can be saved, and the fan can be set to be more compact.

[0045] In other embodiments, in the case where two air-core coils 9 share one circuit board 8, the two impellers 3 may also be arranged face to face, and the specific installation structure and working principle of the impeller 3 are not described in detail here.

[0046] Example 3 Based on the above-mentioned embodiment 1, this embodiment provides another ultra-thin double-sided independent split fan for seat ventilation. The same contents as those of embodiment 1 are not repeated here. The difference lies in that: The central shell 5 includes a pair of second shells 5 - 1 , which are connected via a sealing shock-absorbing member 11 , and the pair of second shells 5 - 1 respectively form the first installation space or the second installation space with the first shell 4 on the corresponding side.

[0047] Specifically, Figure 10-12 As shown, in this embodiment, the central housing 5 is not an integrated structure, but a split structure composed of a pair of second housings 5-1. The pair of second housings 5-1 have the same structure. The pair of second housings 5-1 cooperate with the pair of first housings 4 to form a first installation space and a second installation space, and the pair of second housings 5-1 are connected to each other. In this embodiment, the pair of impellers 3 also adopts a face-to-face form, so the two second housings 5-1 are set to a shape that matches the impeller 3; the two second housings 5-1 are respectively provided with ventilation parts 6, and a sealing shock-absorbing member 11 is also provided between the two second housings 5-1. Optionally, the sealing shock-absorbing member 11 is a silicone pad, a rubber pad or a hose. The sealing shock-absorbing member 11 is used to seal the passage after the connection between the two second housings 5-1, and can also effectively play a shock-absorbing role, reduce the transmission of vibration when the fan is working, and thus reduce the noise generated by the fan.

[0048] Specifically, in this embodiment, the driving device also includes a pair of circuit boards 8, a pair of hollow coils 9 and a pair of rotating magnets 10. The hollow coils 9 are arranged on the side of the circuit board 8 close to the second shell 5-1, and the rotating magnets 10 are arranged on the side of the hollow coils 9 close to the second shell 5-1.

[0049] Example 4 On the basis of the above-mentioned embodiment 3, this embodiment provides another ultra-thin double-sided independent split fan for seat ventilation. The same contents as those of embodiment 1 are not repeated here. The difference is that: like Figure 13-Figure 15 As shown, in this embodiment, a pair of impellers 3 are back-to-back, both sides of a pair of second housings 5-1 are set to be flat, and a pair of first housings 4 are set to be in a shape that matches the impeller 3. In addition, in this embodiment, the end of the transmission shaft 7 close to the first housing 4 is realized to rotate relative to the first housing 4 through the copper cap 20, and the end of the transmission shaft 7 close to the second housing 5-1 is realized to rotate relative to the second housing 5-1 through the rotating assembly 12.

[0050] Example 5 Based on the above-mentioned embodiment 4, this embodiment provides another ultra-thin double-sided independent split fan for seat ventilation. The same contents as those of embodiment 1 are not repeated here. The difference is that: like Figure 16-Figure 17 As shown, in this embodiment, the driving device includes a circuit board 8, a pair of hollow coils 9 and a pair of rotating magnets 10. The specific structure of the driving device in this embodiment is the same as the driving device described in the above embodiment 2, that is, the power on and off of the pair of hollow coils 9 is controlled by a circuit board 8. Specifically, the circuit board 8 is installed in the first installation space or the second installation space. When the circuit board 8 is installed in the first installation space, the hollow coil 9 in the first installation space is fixed to the circuit board 8 through the fixing plate 22, and the hollow coil 9 in the second installation space is fixed in the second space through the fixing plate 22. The hollow coil 9 in the second installation space is electrically connected to the circuit board 8 through a wiring harness, and vice versa. The principle is the same.

[0051] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. An ultra-thin double-sided independent split fan for seat ventilation, characterized in that: include: An installation shell, wherein a first installation space and a second installation space are coaxially stacked and connected to each other, and a first air guide portion (1) connected to the first installation space and a second air guide portion (2) connected to the second installation space are respectively provided on the outer peripheral side of the installation shell; A pair of impellers (3), the pair of impellers (3) being rotatably mounted in the first mounting space and the second mounting space respectively; the impeller (3) in the first mounting space and the first air guide portion (1) form a first blowing and suction unit, and the impeller (3) in the second mounting space and the second air guide portion (2) form a second blowing and suction unit; An axial magnetic flux driving mechanism, wherein the axial magnetic flux driving mechanism is used to independently drive a pair of impellers (3) to rotate separately.

2. The ultra-thin double-sided independent split fan for seat ventilation according to claim 1, characterized in that: The installation shell comprises a central shell (5) and a pair of first shells (4), wherein the pair of first shells (4) are respectively arranged on both sides of the central shell (5), wherein a first installation space is formed between one of the first shells (4) and the central shell (5), and a second installation space is formed between the other of the first shells (4) and the central shell (5); and a ventilation portion (6) is provided on the central shell (5) for connecting the first installation space and the second installation space.

3. The ultra-thin double-sided independent split fan for seat ventilation according to claim 2, characterized in that: The axial magnetic flux driving mechanism comprises: a pair of transmission shafts (7), the pair of transmission shafts (7) being rotatably mounted in the first installation space and the second installation space respectively via a pair of rotating assemblies (12), the transmission shafts (7) being coaxially arranged with the impeller (3) and fixedly connected; A driving device, wherein the driving device is respectively sleeved on a pair of the transmission shafts (7), and the driving device is used to independently drive the pair of the transmission shafts (7).

4. The ultra-thin double-sided independent split fan for seat ventilation according to claim 3, characterized in that: The rotating assembly (12) comprises: A copper middle tube (13), the copper middle tube (13) being coaxially arranged with the transmission shaft (7), the copper middle tube (13) being hollow inside and having two ends connected; A pair of bearings (14), the pair of bearings (14) being arranged in the copper middle tube (13) and sleeved on the transmission shaft (7), the inner rings of the bearings (14) being fixedly connected to the side wall of the transmission shaft (7).

5. The ultra-thin double-sided independent split fan for seat ventilation according to claim 4, characterized in that: The rotating assembly (12) further comprises a preload elastic member (15), wherein the preload elastic member (15) is disposed between a pair of the bearings (14), and the preload elastic member (15) squeezes the bearings (14) to eliminate the clearance between the inner ball and the inner ring and the outer ring of the bearings (14).

6. The ultra-thin double-sided independent split fan for seat ventilation according to claim 5, characterized in that: The impeller (3) comprises an outwardly convex first working surface (3-1) and an inwardly concave second working surface (3-2); the first working surfaces (3-1) of a pair of impellers (3) are arranged close to each other.

7. The ultra-thin double-sided independent split fan for seat ventilation according to claim 5, characterized in that: The impeller (3) comprises an outwardly convex first working surface (3-1) and an inwardly concave second working surface (3-2), and the first working surfaces (3-2) of a pair of impellers (3) are arranged close to each other.

8. The ultra-thin double-sided independent split fan for seat ventilation according to claim 5, characterized in that: The central housing (5) comprises a pair of second housings (5-1), the pair of second housings (5-1) being connected via a sealing shock-absorbing member (11), and the pair of second housings (5-1) respectively forming the first installation space or the second installation space with the first housing (4) on the corresponding side.

9. The ultra-thin double-sided independent split fan for seat ventilation according to any one of claims 6 to 8, characterized in that: The driving device comprises two driving units, the two driving units are respectively used to drive a pair of transmission shafts (7), and the driving units comprise: Circuit board (8); A hollow coil (9), the hollow coil (9) being mounted on the circuit board (8) and sleeved on the corresponding transmission shaft (7), the hollow coil (9) being electrically connected to the circuit board (8); A rotating magnet (10), the rotating magnet (10) being arranged on a side of the hollow coil (9) away from the circuit board (8), and being sleeved on the corresponding transmission shaft (7) and fixed to the transmission shaft (7).

10. The ultra-thin double-sided independent split fan for seat ventilation according to claim 6, characterized in that: The driving device comprises a driving unit, wherein the driving unit is used to drive a pair of transmission shafts (7) respectively, and the driving unit comprises: Circuit board (8); a pair of hollow coils (9), the pair of hollow coils (9) being respectively arranged on both sides of the circuit board (8) and fixed to the circuit board (8), and the pair of hollow coils (9) being both electrically connected to the circuit board (8); A pair of rotating magnets (10), the pair of rotating magnets (10) are respectively arranged on one side of the pair of hollow coils (9) away from the circuit board (8), and the pair of rotating magnets (10) are respectively sleeved on the corresponding transmission shafts (7) and fixed to the corresponding transmission shafts (7).

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