High-speed fan motor and high-speed blower

Abstract

The invention belongs to the technical field of motors, and particularly relates to a high-speed fan motor and a high-speed blower, the high-speed fan motor comprises a multi-channel machine shell which is arranged to be of a three-layer cylindrical structure which is coaxially arranged inside and outside and is nested in a staggered mode, and an annular columnar main air channel is formed between an inner shell and an outer shell; the inner shell is provided with a first radial rib for connecting the inner shell with the outer shell; and a cylindrical secondary air duct is formed between the inner shell and the bearing mounting sleeve, and a second radial rib for connecting the inner shell and the bearing mounting sleeve is arranged between the inner shell and the bearing mounting sleeve. The device comprises an airflow acceleration structure, the airflow acceleration structure produces a remarkable low-pressure area in a corresponding area of an iron core of a main air channel, air in a secondary air channel is strongly sucked to flow through a coil gap and a magnetic gap at a high speed, and active and efficient cooling of a heating core is achieved. The temperature of the iron core and the coil is reduced, the efficiency of the motor is higher, supplied current can be reduced, radiation and heat transmitted to the bearing are reduced, the bearing is cooled, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] This invention relates to the field of fan motors, and particularly to a high-speed fan motor and a high-speed blower. Background Technology

[0002] The high-speed fan motor is the core component of modern high-speed hair dryers. Taking a typical high-speed motor with an outer diameter of 28.8mm as an example, its speed is typically between 80,000 and 130,000 revolutions per minute, with a power output between 60 and 120 watts, exhibiting extremely high power density. During operation, the motor stator core and coils generate a large amount of heat, while high-speed friction in the bearings and friction between the magnetic ring and the air also generate additional heat. Poor heat dissipation can easily lead to overheating and burnout of the coils or a drastic reduction in bearing life, which are common causes of malfunctions in high-speed hair dryers.

[0003] Existing technologies have attempted to improve motor heat dissipation. For example, Chinese patent CN202410709935.0 discloses a high-speed fan motor with a heat dissipation duct. It has a second duct (equivalent to a secondary duct) between the fixed tube and the support base, and is connected to the main duct (first duct) through the gap between the bottom surface of the fan and the front end surface of the fixed tube, with the intention of guiding airflow to cool the stator.

[0004] However, this scheme has a significant drawback: secondly, the air intake of the duct depends entirely on the aforementioned gap. Because the airflow velocity in the main duct is high at this gap, according to Bernoulli's principle, the air pressure will decrease here. This leads to two problems: If the air pressure here is too low, it will not only fail to effectively guide the airflow into the secondary air duct, but may also "draw air" from the secondary air duct, weakening the internal heat dissipation airflow; Secondly, if the airflow velocity in the main air duct at the secondary air duct outlet (side of the heat dissipation hole) is not specially designed, the air pressure difference with that at the air inlet is not significant, failing to create a sufficient pressure difference to drive the airflow at high speed through the core heat-generating areas such as the coil. If the airflow at the inlet is insufficient, too little heat is removed, causing the iron core and coil to heat up rapidly, leading to high-temperature burnout and short circuit damage. This triggers automatic protection in the control circuit, preventing the motor from rotating. Simultaneously, the heat from the iron core and coil is transferred to the bearings, causing them to heat up and affecting their lifespan. This is a major malfunction of existing high-speed hair dryers. Therefore, the limited airflow velocity in the secondary air duct of current technology does not significantly improve heat dissipation and fails to fundamentally solve the problem of overheating in the high-speed motor core. Summary of the Invention

[0005] One object of the present invention is to provide a high-speed fan motor and a high-speed blower that at least solves any of the above-mentioned technical problems.

[0006] A further objective of this invention is to actively guide and enhance the cooling airflow through the motor, thereby achieving efficient and active cooling of the motor core, reducing operating temperature rise, and improving reliability.

[0007] Another further objective of this invention is to improve the service life of the motor.

[0008] In particular, the present invention provides a high-speed fan motor, including a fan rotor assembly, a stator assembly and a multi-channel housing; the multi-channel housing is configured as a three-layer cylindrical structure with inner and outer coaxial interleaved nesting, including an outermost outer shell, a middle inner shell and an inner bearing mounting sleeve; A circular cylindrical main air duct is formed between the inner shell and the outer shell, and a first radial rib is provided to connect the inner shell and the outer shell; A cylindrical secondary air duct is formed between the inner shell and the bearing mounting sleeve, and a second radial rib is provided to connect the inner shell and the bearing mounting sleeve. The fan rotor assembly has a fan disc corresponding to the bearing mounting sleeve and a fan blade corresponding to the main air duct, and the fan blades are arranged in a ring array with the fan disc as the center. The stator assembly has a rubber-coated iron core mounted at one end of the inner shell and an inner-wound coil; The outlet end of the secondary air duct is connected to the main air duct through an internal heat dissipation channel formed by the coil gaps between the coils and the magnetic gap between the rubber-coated iron core and the magnetic ring. The secondary air duct has an air intake passage that is independent of the first gap between the front edge of the inner shell and the fan blade disk; The outer casing and / or the exterior of the outer casing are provided with an airflow acceleration structure.

[0009] Furthermore, the air intake passage includes a plurality of communication ports disposed at the front edge of the inner shell, the communication ports connecting the main air duct and the secondary air duct.

[0010] Furthermore, the windward side of the communication port near the main air duct is set as an acute angle side.

[0011] Furthermore, the air intake passage consists of at least two sets of vent holes evenly distributed throughout the fan blade disk, and the vent holes connect the outer surface of the air intake end of the fan blade disk with the inner cavity of the disk.

[0012] Furthermore, the vent is inclined relative to the plane of the fan blade, and its inclination direction is the same as that of the fan blade.

[0013] Furthermore, the vent is funnel-shaped, and the outlet size of the vent facing the inner cavity of the disk is larger than the inlet size facing the outer disk surface.

[0014] Furthermore, the airflow acceleration structure is a first inwardly protruding ring or segment shape disposed on the inner wall of the outer shell and located on the outer side of the rubber-coated iron core.

[0015] Furthermore, the airflow acceleration structure is a forked structure formed by the first radial rib near the rubber-coated iron core, connecting to the inner wall of the outer shell, which is used to block part of the main air duct.

[0016] Furthermore, the airflow acceleration structure is a flexible outer sleeve fitted on the outer wall of the outer shell. The flexible outer sleeve extends to the part corresponding to the rubber-coated iron core and has a second inward protrusion that squeezes the main air channel inward to form a channel contraction.

[0017] A high-speed hair dryer includes a high-speed fan motor as described in any one of the above claims, and a hair dryer housing for mounting the high-speed fan motor; the inner wall of the hair dryer housing has a third inward protrusion at the part corresponding to the rubber-coated iron core, which is used to cooperate with the outer wall of the outer shell to jointly form the airflow acceleration structure.

[0018] The technical effects and advantages of this invention are as follows: 1. This invention achieves more efficient heat dissipation for the high-speed fan motor through an independent air intake channel and an active airflow acceleration structure. The secondary airflow directly blows through the coil gaps and the inner ring gaps of the iron core, i.e., the inner heat dissipation area, carrying away more heat generated by the coil and iron core during operation. It also removes heat generated by the high-speed rotation of the bearings and the friction between the high-speed rotation of the magnetic ring and the air. Simultaneously, the high-speed airflow from the main airflow carries away heat from the outer ring of the iron core and heat conducted from the iron core to the multi-channel housing, thus reducing the risk of coil overheating and burn-through damage. The airflow acceleration structure creates a significant low-pressure zone in the iron core area of ​​the main airflow channel, powerfully "drawing" high-speed airflow from the secondary airflow channel through the coil gaps and magnetic gaps, achieving active and efficient cooling of the heat-generating core. The reduced temperature of the iron core and coils leads to higher motor efficiency, allowing for a reduction in the supplied current. It also reduces heat radiation and transfer to the bearings, resulting in cooler bearings and extended bearing life.

[0019] 2. The integrated casing design of the three-layer coaxial nesting of the present invention makes the main and secondary air duct structures stable, the airflow path clear, unaffected by excessive assembly gaps, with good performance consistency and material saving.

[0020] 3. This invention effectively reduces air turbulence and whistling by optimizing the design of the windward side of the communication port and the shape of the vent, as well as by using a smooth transition at the airflow acceleration structure, thereby reducing operating noise. Attached Figure Description

[0021] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic cross-sectional view of the structure of the present invention.

[0022] Figure 2 This is a structural schematic diagram of the multi-channel housing of the high-speed fan motor of the present invention from a first-view perspective.

[0023] Figure 3 This is a schematic diagram of the rubber-coated iron core and coil of the high-speed fan motor.

[0024] Figure 4 This is a structural diagram of the front and back sides of the high-speed fan motor blade disk of the present invention.

[0025] Figure 5 This is an exploded structural diagram of the high-speed fan motor of the present invention.

[0026] Figure 6 This is a schematic diagram of the main air duct of the high-speed fan motor of the present invention.

[0027] Figure 7 This is a cross-sectional view of the concave housing of the high-speed fan motor of the present invention.

[0028] Figure 8 This is a schematic diagram of the first radial rib bifurcation of the high-speed fan motor of the present invention.

[0029] Figure 9 This is a cross-sectional view of the flexible jacket of the high-speed fan motor of the present invention.

[0030] Figure 10 This is a cross-sectional view of the motor housing of the high-speed hair dryer of the present invention.

[0031] Figure 11 This is a structural schematic diagram of the multi-channel housing of the high-speed fan motor of the present invention from a second perspective.

[0032] Figure 12 For the present invention Figure 11 Schematic diagram of the cross-sectional structure along the AA direction.

[0033] Figure 13 For the present invention Figure 3 A schematic diagram of the left-side structure of the rubber-coated iron core and coil.

[0034] In the picture: 1. Fan rotor assembly; 11. Fan blade disk; 111. Fan blade; 112. Outer disk surface; 113. Inner cavity of the disk; 114. Vent hole; 115. Shaft hole; 12. Magnetic ring; 13. Rotating shaft; 14. Bearing; 2. Stator assembly; 21. Rubber-coated iron core; 211. Metal pin; 22. Coil; 221. Coil gap; 23. Connecting circuit board; 231. Groove; 24. Second gap; 25. Internal heat dissipation area; 3. Multi-channel casing; 31. Outer casing; 311. Inner wall of outer casing; 312. First inward protrusion; 313. Air inlet; 314. Air outlet; 32. Main air duct; 321. Main air duct area; 3211. External heat dissipation area; 33. First radial rib; 331. Main air duct through hole; 332. Fork; 333. First windward edge; 34. Inner shell; 341. Inner shell outer wall; 342. Inner shell inner wall; 343. Communication port; 344. Front edge; 3441. First gap; 345. Rear edge; 35. Secondary air duct; 351. Air inlet passage; 36. Second radial rib; 361. Secondary air duct through hole; 362. Second windward edge; 37. Bearing mounting sleeve; 4. Flexible outer sleeve; 41. Second inward protrusion; 5. Blower housing; 51. Third inward protrusion. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Figure 1 This is a schematic cross-sectional view of the present invention. Figure 2 This is a structural schematic diagram of the multi-channel housing of the high-speed fan motor of the present invention from a first-view perspective. Figure 3 This is a schematic diagram of the rubber-coated iron core and coil of the high-speed fan motor. Figure 4 This is a structural diagram of the high-speed fan motor blade disk of the present invention. Figure 5 This is an exploded structural diagram of the high-speed fan motor of the present invention. Figure 6 This is a schematic diagram of the main air duct of the high-speed fan motor of the present invention. Figure 7 This is a cross-sectional view of the concave housing of the high-speed fan motor of the present invention. Figure 8 This is a schematic diagram of the first radial rib bifurcation of the high-speed fan motor of the present invention. Figure 9 This is a cross-sectional view of the flexible jacket of the high-speed fan motor of the present invention. Figure 10 This is a cross-sectional view of the motor housing of the high-speed hair dryer of the present invention. Figure 11 This is a structural schematic diagram of the multi-channel housing of the high-speed fan motor of the present invention from a second perspective. Figure 12 This is a schematic diagram of the cross-sectional structure along the AA direction in this figure. Figure 13 For the present invention Figure 3 A schematic diagram of the left-side structure of the rubber-coated iron core and coil.

[0037] Example 1: like Figure 1 and Figure 2 , Figure 5 , Figure 11 , Figure 12 As shown, this embodiment provides a high-speed fan motor, including a multi-channel housing 3, a fan rotor assembly 1, and a stator assembly 2; the specific structure of the multi-channel housing 3 is as follows. Figure 2 and Figure 5 As shown, it is configured as a three-layered cylindrical structure with coaxial inner and outer layers, including an outermost outer shell 31, a middle inner shell 34, and an inner bearing mounting sleeve 37. A main air duct 32 in the shape of a ring column is formed between the inner shell 34 and the outer shell 31, and a first radial rib 33 is provided to connect the inner shell 34 and the outer shell 31. A secondary air duct 35 in the shape of a ring column is formed between the inner shell 34 and the bearing mounting sleeve 37, and a second radial rib 36 is provided to connect the inner shell 34 and the bearing mounting sleeve 37. The first radial ribs 33 are evenly distributed in the main air duct 32, and the second radial ribs 36 are evenly distributed in the secondary air ducts 35. Preferably, the first windward edge 333 of the first radial rib near the air inlet can also be set as an acute angle edge to reduce airflow turbulence and noise.

[0038] like Figure 1 and Figure 4 As shown, the fan rotor assembly 1 has a rotating shaft 13. The rotating shaft 13 is mounted in the bearing mounting sleeve 37 via a bearing 14. A fan blade disk 11 is fixed at one end of the rotating shaft 13, and the fan blade disk 11 corresponds to the bearing mounting sleeve 37. Fan blades 111 corresponding to the main air duct 32 are arranged on the radial outer edge of the fan blade disk 11. The fan blades 111 are arranged in a ring array with the fan blade disk 11 as the center. A magnetic ring 12 is fixed at the other end of the rotating shaft 13.

[0039] like Figure 1 , Figure 3 , Figure 5 and Figure 13 As shown, the stator assembly 2 has a rubber-coated iron core 21 and coils 22 wound inside the rubber-coated iron core 21; the stator assembly 2 is mounted on one end of the inner shell 34 near the air outlet 314. The magnetic ring 12 is located at the center of the inner ring of the rubber-coated iron core 21, and a magnetic gap is formed between the two. There are naturally formed coil gaps 221 between the coils 22; metal leads 211 extend from the rubber-coated iron core 21 and are soldered to a connecting circuit board 23, and a second gap 24 is formed between the connecting circuit board 23 and the rubber-coated iron core 21.

[0040] In this embodiment, the secondary air duct 35 is provided with an independent air inlet passage 351, which is located at the front edge of the inner shell 34, specifically manifested as multiple communication ports 343 provided on the front edge 344 of the inner shell; such as Figure 1 As shown, the communication port 343 connects the main air duct 32 and the secondary air duct 35, forming an air intake channel independent of the first gap 3441 between the front edge 344 of the inner shell 34 and the fan blade disk 11. The windward side of the communication port 343 near the main air duct 32 is set with an acute angle to reduce air intake turbulence and noise. The communication port 343 can be as follows: Figure 1 The rectangle shown can also be an arc or other shapes.

[0041] Furthermore, an airflow acceleration structure is provided on the inner wall 311 of the outer shell 31; in this embodiment, this structure is a first inward protrusion 312 located on the outer side of the rubber-coated iron core 21, in the form of a ring or segment; as shown Figure 1 and Figure 6 As shown, the first inward protrusion 312 causes the cross-sectional area of ​​the main air duct 32 to be smoothly contracted when it flows through the region outside the rubber-coated iron core 21, forming an acceleration section.

[0042] The working principle of this embodiment is as follows: The outlet end of the secondary air duct 35 is connected to the main air duct 32 through an internal heat dissipation channel and an internal heat dissipation area 25 formed by the coil gap 221, the magnetic gap, and the second gap 24. When the motor is working, the airflow generated by the rotation of the fan blade 111 flows through the main air duct 32 at high speed. When passing through the airflow acceleration structure, i.e., the first inward protrusion 312, according to Bernoulli's principle, the wind speed increases and the air pressure decreases. This low-pressure area is located near the outlet of the internal heat dissipation channel, i.e., at the second gap 24 and the groove 231 of the connecting circuit board 23. At the same time, since the air pressure in the main air duct is relatively high at the inlet of the air intake passage 351 and the inlet of the communication port 343, under the pressure difference drive, the air actively enters the secondary air duct 35 through the air intake passage 351, flows through the internal heat dissipation channel, strongly washes the coil 22 and the magnetic ring 12, takes away the heat, and then flows into the low-pressure area of ​​the main air duct 32 from the outlet of the internal heat dissipation channel and is discharged. This design significantly enhances the internal heat dissipation of the motor. As the temperature of the iron core and coil decreases, the motor becomes more efficient, allowing for a reduction in the supplied current. This also reduces the heat radiated and transferred to the bearings, thus lowering the bearing temperature and extending their lifespan.

[0043] Example 2: like Figure 4As shown, the main difference between this embodiment and Embodiment 1 lies in the arrangement of the air inlet passage 351. In this embodiment, the air inlet passage 351 consists of at least two sets of vent holes 114 evenly distributed throughout the fan blade disk 11. The vent holes 114 connect the outer surface 112 of the fan blade disk 11 at the air inlet end with the inner cavity 113 of the disk on its back side. The vent holes 114 can be inclined relative to the plane of the fan blade disk 11, and their inclination direction is the same as that of the fan blade 111. Preferably, the vent holes 114 are funnel-shaped, and their outlet size facing the inner cavity 113 of the disk is larger than their inlet size facing the outer surface 112. When the fan blade disk 11 rotates, the vent holes 114 can actively pump external air into the inner cavity 113 of the disk, thereby providing a stable air source for the secondary air duct 35. Preferably, the second windward edge 362 of the second radial rib 36, which is swept by the airflow through the vent 114, is set as an acute angle edge to reduce airflow turbulence and noise.

[0044] like Figure 4 As shown, in another embodiment, each group of vents 114 may consist of two through holes. The distance between the two through holes is different from the distance between each group of vents 114, which can avoid the airflow from generating resonance noise.

[0045] Example 3: like Figure 8 As shown, the main difference between this embodiment and embodiment 1 lies in the setting of the airflow acceleration structure. In this embodiment, the airflow acceleration structure is manifested as a forked structure 332 formed by the first radial rib 33 near the rubber-coated iron core 21. The forked structure 332 is connected to the inner wall 311 of the outer shell and is used to block part of the main air duct 32, thereby achieving the same effect of concentrating and accelerating the airflow to the outside of the rubber-coated iron core 21.

[0046] Example 4: like Figure 9 As shown, this embodiment provides another way to implement the airflow acceleration structure; the structure is a flexible outer jacket 4 sleeved on the outer wall of the outer shell 31. The flexible outer jacket 4 extends to the part corresponding to the rubber-coated iron core 21 and has a second inward protrusion 41. The second inward protrusion 41 squeezes the main air duct 32 inward to form a flow channel contraction from the outside.

[0047] Example 5: like Figure 10As shown, this embodiment provides a high-speed hair dryer, which includes a high-speed fan motor as described in any of the preceding embodiments, and a hair dryer housing 5 for mounting the motor; the inner wall of the hair dryer housing 5 is provided with a third inward protrusion 51 at the part corresponding to the rubber-coated iron core 21, which is used to cooperate with the outer wall of the outer shell 31 to jointly form the airflow acceleration structure from the outside, thereby optimizing the heat dissipation channel of the whole machine without changing the design of the motor body.

[0048] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high speed fan motor comprising a fan blade rotor assembly, a stator assembly and a multi-channel housing; characterized in that, The multi-channel housing is configured as a three-layer cylindrical structure with coaxial inner and outer layers, including an outermost outer shell, a middle inner shell, and an inner bearing mounting sleeve. A circular cylindrical main air duct is formed between the inner shell and the outer shell, and a first radial rib is provided to connect the inner shell and the outer shell; A cylindrical secondary air duct is formed between the inner shell and the bearing mounting sleeve, and a second radial rib is provided to connect the inner shell and the bearing mounting sleeve. The fan rotor assembly has a fan disc corresponding to the bearing mounting sleeve and a fan blade corresponding to the main air duct, and the fan blades are arranged in a ring array with the fan disc as the center. The stator assembly has a rubber-coated iron core mounted at one end of the inner shell and an inner-wound coil; The outlet end of the secondary air duct is connected to the main air duct through an internal heat dissipation channel formed by the coil gaps between the coils and the magnetic gap between the rubber-coated iron core and the magnetic ring. The secondary air duct has an air intake passage that is independent of the first gap between the front edge of the inner shell and the fan blade disk; The outer casing and / or the exterior of the outer casing are provided with an airflow acceleration structure.

2. A high speed fan motor as set forth in claim 1 wherein, The air intake passage includes multiple communication ports located at the front edge of the inner shell, and the communication ports connect the main air duct and the secondary air duct.

3. A high speed fan motor as set forth in claim 2 wherein, The windward side of the communication port near the main air duct is set as an acute angle.

4. A high speed fan motor as set forth in claim 1 wherein, The air intake passage consists of at least two sets of vent holes evenly distributed throughout the fan blade disk, and the vent holes connect the outer surface of the air intake end of the fan blade disk with the inner cavity of the disk.

5. A high speed fan motor as set forth in claim 4 wherein, The vent is inclined relative to the plane of the fan blade, and its inclination direction is the same as that of the fan blade.

6. A high speed fan motor as claimed in claim 4 or 5 wherein, The vent is funnel-shaped, and the outlet size of the vent facing the inner cavity of the disk is larger than the inlet size facing the outer disk surface.

7. A high speed fan motor as set forth in claim 1 wherein, The airflow acceleration structure is a first inward protrusion in the shape of a ring or segment, which is disposed on the inner wall of the outer shell and located on the outer side of the rubber-coated iron core.

8. A high speed fan motor as set forth in claim 1 wherein, The airflow acceleration structure is a forked structure formed by the first radial rib near the rubber-coated iron core, connecting to the inner wall of the outer shell, which is used to block part of the main air duct.

9. A high speed fan motor as set forth in claim 1 wherein, The airflow acceleration structure is a flexible outer sleeve fitted on the outer wall of the outer shell. The flexible outer sleeve extends to the part corresponding to the rubber-coated iron core and has a second inward protrusion that compresses the main air channel inward to form a channel contraction.

10. A high speed hair dryer characterized by, The invention includes a high-speed fan motor as described in any one of claims 1 to 9, and a blower housing for mounting the high-speed fan motor; the inner wall of the blower housing has a third inward protrusion at the location corresponding to the rubber-coated iron core, which is used to cooperate with the outer wall of the outer shell to jointly form the airflow acceleration structure.

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