CN115263789A

CN115263789A - Miniature fan

Info

Publication number: CN115263789A
Application number: CN202211000748.2A
Authority: CN
Inventors: 郑伟
Original assignee: Shenzhen Yunjing Industry Co ltd
Current assignee: Shenzhen Yunjing Industry Co ltd
Priority date: 2022-08-19
Filing date: 2022-08-19
Publication date: 2022-11-01

Abstract

The invention provides a micro fan, which relates to the field of fans and comprises an air duct shell, an impeller and a motor, wherein the air duct shell comprises an outer shell, the outer shell is connected with an inner shell through a plurality of splitter blades, the rear edges of the splitter blades are superposed with a normal line of the cross section of the corresponding inner shell, the inner shell comprises a stator cavity shell and a bearing cavity shell, a stator component is connected with the bearing cavity shell through a high-voltage isolation pad, a second through hole is arranged on the bearing cavity shell in the axial direction, the distance from the top end of a mandrel to the bottom end of the mandrel is smaller than the distance from the top end of the mandrel to the bottom end of a magnet, a rotor component assembly groove body is arranged on the outer side wall of the mandrel, a first groove is of a multi-lead threaded structure, a second groove and a third groove are formed by phase deviation of a plurality of sine wave-shaped groove structures, the motor is a three-phase direct-current brushless motor, and adopts six-groove two poles. The wind power generator has the advantages of high wind speed, high wind pressure, good heat dissipation, energy conservation, environmental protection, low rotational inertia, small resistance, high safety and stability, low noise and long service life.

Description

Miniature fan

Technical Field

The invention belongs to the field of fans, and particularly relates to a micro fan.

Background

The blower is a machine that increases the pressure of gas and discharges the gas by means of mechanical energy, and it is a driven fluid machine, in which a micro-blower is generally widely used in the field of hair dryers.

The spindle part of the existing micro fan usually penetrates through a magnet structure, the length of the spindle is large, the whole weight of the micro fan is relatively large, particularly for a blower, the weight is small, and the micro fan is more convenient to use and carry; the angle and shape of the splitter blade in the air duct can affect the air volume and the air pressure generated by the fan; the heat generated by the micro fan in the working process is taken away by the air duct, but the heat dissipation effect on the heat generated inside the stator assembly is not obvious, the secondary utilization of the heat energy cannot be carried out, and the energy-saving effect is poor; the PCB connected with the micro fan is arranged outside the shell of the micro fan, is easy to damage, and has potential safety hazards due to the generation of electric arcs; in the assembling process of rotor subassembly, the majority uses glue to carry out lug connection, and the rubber coating clearance is less, can't form even face of gluing, makes the bonding strength reduce, and during glue easily got into bearing part, influence bearing part's function and life-span, and the mini fan easily produced great noise at the during operation.

Therefore, it is urgently needed to provide a micro fan which can solve the problems of the prior art, such as high wind speed, high wind pressure, good heat dissipation, energy conservation, environmental protection, low rotational inertia, small resistance, high safety and stability, low noise and long service life.

Disclosure of Invention

The invention aims to provide a micro fan aiming at the defects of the existing micro fan.

The invention provides the following technical scheme:

according to a first aspect of the present invention, there is provided a micro air blower comprising an air duct housing, an impeller, and a motor; the air duct casing comprises an outer shell, the outer shell is in a hollow cylindrical shape, a grounding male terminal is arranged on the side wall of the bottom of the outer shell, the inner surface of the outer shell is connected with the outer surface of the inner shell through a plurality of splitter blades, the splitter blades radially surround the inner shell, the outer shell and an air duct formed between the inner shell are divided into a plurality of same pore passages by the splitter blades, and the inner shell is used for supporting a stator assembly and a rotor assembly of the motor.

Splitter blade includes leading edge, back edge, leaf eyebrow and blade root, the back edge with correspond a normal line coincidence of inner shell cross section, back edge place plane with the cross section of inner shell is parallel or the coincidence, the back edge with angle design between the inner shell makes micro-fan is at the amount of wind and the wind pressure of during operation obviously increase.

The inner shell includes stator chamber casing and bearing chamber casing, stator chamber casing is the even hollow cylinder of internal diameter, stator module locates the inside of stator chamber casing, the upper surface of stator module's top end passes through the high pressure spacer to be connected the lower surface of bearing chamber casing bottom end, bearing chamber casing bottom end is connected the top end of stator chamber casing, the top end of bearing chamber casing is equipped with cylindric boss along axial extension, bearing chamber casing with the boss runs through in the axial and is equipped with first through-hole, the internal diameter of stator chamber casing is greater than the internal diameter of first through-hole, bearing chamber casing with the axis of boss with the axis coincidence of first through-hole, the external diameter of boss is less than the external diameter of bearing chamber casing, the cross-section of bearing chamber casing has a plurality of second through-holes on the axial, the second through-hole distribute in the periphery of first through-hole, the one end of second through-hole pass through the lateral wall of boss extends to the top end of boss, every the second through-hole is in the cross-sectional area on the boss all is less than the cross-sectional area itself of second through the stator module, the second through-hole makes the lateral wall of stator module and the heat dissipation portion spare is used when the heat hair dryer is blown the heat dissipation portion is gone out the heat is convenient for hair dryer and the heat dissipation boss, the heat dissipation portion boss is taken the heat boss, the heat boss is convenient for hair dryer is the heat is blown to be blown.

The rotor assembly comprises a mandrel, a bearing component and a magnet, wherein the bearing component is installed on the inner wall of the bearing cavity shell, the bearing cavity shell supports the rotor assembly at the position of the bearing component, the balance degree of the micro fan is increased, the magnet is arranged in a cavity gap of the stator assembly, one end of the mandrel sequentially penetrates through a center hole of the impeller and the bearing component and is inserted in the magnet, the distance from the top end of the mandrel to the bottom end of the mandrel is smaller than the distance from the top end of the mandrel to the bottom end of the magnet, the bottom end of the mandrel does not penetrate through the magnet, a concave semi-embedded structure is formed, and as the whole mandrel is shorter and has smaller mass, the inertia of the rotor assembly during high-speed rotation can be reduced, and the heat conduction area is increased. The impeller is arranged outside the bearing cavity shell, and when the mandrel rotates, the impeller, the bearing part and the magnet synchronously rotate.

The outer side wall of the mandrel is provided with a rotor assembly groove body used for coating an adhesive, the rotor assembly groove body comprises a first groove, a second groove and a third groove, the first groove is of a multi-lead threaded structure, the impeller is sleeved on the outer side wall of the top end of the mandrel, the first groove is connected with the inner side wall of the central hole through the adhesive, when the mandrel drives the impeller to rotate at a high speed, under the action of rotating force, friction force towards the bottom end of the mandrel is generated between the impeller and the first groove, the impeller is prevented from being separated from the mandrel and flying out of the micro fan structure, and the stability of the micro fan structure is improved; the second groove and the third groove are formed by phase deviation of a plurality of sine wave-shaped groove structures, the second groove and the third groove are connected with the bearing part through adhesives, liquid glue is dripped into the second groove and the third groove of the sine wave-shaped structures, when the bearing part is installed on the mandrel, the glue is evenly distributed in the second groove and the third groove along sine waves under the extrusion effect, the overflow of the glue can be prevented, the adhesive force is increased, the stress is uniform when the bearing part is solidified, and the stability is improved.

The bottom end of the air duct shell is provided with an annular end sleeve, and a PCB is arranged inside the annular end sleeve.

The impeller comprises a wing 36674and a plurality of fan blades, wherein the upper surface and the lower surface of the wing 36674are respectively provided with a first raised head and a second raised head, so that the bonding area of the central hole of the impeller and the mandrel can be increased, the stability is improved, the central hole is arranged in the first raised head, the wing 36674and the second raised head in a penetrating way, the central axes of the first raised head, the second raised head and the central hole are superposed, and the fan blades are of a quadratic curved surface structure.

The motor is a three-phase brushless DC motor and adopts six-slot two poles.

Preferably, the bearing component includes a first bearing, a second bearing and a pressing component arranged between the first bearing and the second bearing, the first bearing and the second bearing are both sleeved on the outer side wall of the mandrel, the second groove is connected with the inner side wall of the first bearing through an adhesive, and the third groove is connected with the inner side wall of the second bearing through an adhesive.

Preferably, the pressing member includes a first balance ring, a second balance ring and an elastic member disposed between the first balance ring and the second balance ring, two ends of the elastic member are respectively in pressing contact with a lower surface of the first balance ring and an upper surface of the second balance ring, the elastic member can apply a preload to the first balance ring and the second balance ring, so as to improve the performance of the bearing member and increase the service life of the bearing member, the elastic member can be a spring, and the spring is not in direct contact with the first bearing and the second bearing, so as to reduce the wear and reduce the noise generated by the rotor assembly during high-speed rotation.

Preferably, the bottom of stator module is inserted and is equipped with the core lid, the core lid is high temperature resistant plastics material, and its quality is less, the core lid include cylindric lid and with the stopper post of the coaxial setting of lid, the one end of lid lateral wall is equipped with the eaves along radially extending, the setting of eaves is convenient the installation of core lid, the stopper post is located in the lacuna of magnet bottom end, the bottom end of dabber with there is certain interval between the top end of stopper post, the dabber with form the negative pressure vacuum between the lacuna of magnet, rotor subassembly is little at rotatory in-process amplitude of fluctuation, reducible air current disturbance, reduce the resistance, prevent high voltage arc discharge, and have dirt-proof effect, increase the life of fan.

Preferably, the high pressure isolation pad is the ring form pad body, the high pressure isolation pad is equipped with a plurality of third through-holes that run through its upper and lower surface, the third through-hole with the coaxial setting of second through-hole and quantity are the same, the third through-hole with the internal diameter of second through-hole is the same, has the heat dissipation effect in coordination, if stator module's coil has the emergence damage, when closely producing electric arc, the high pressure isolation pad can prevent wind channel casing electric leakage increases its security in the use, the quantity of third through-hole can be four, and is adjacent distance between the third through-hole equals.

Preferably, splitter blade the leading edge bottom is arrived distance value between the back edge bottom is greater than the inner wall of stator cavity casing can strengthen amount of wind and wind pressure at axial length value, splitter blade with the quantity in pore is 8, the heat that micro fan produced in the course of the work, accessible wind channel are fully taken away, carry out the reutilization of heat energy, when using in the hair-dryer field, can be in coordination with the heat energy of heater by the heat energy of taking out for the speed of drying by hair, energy-concerving and environment-protective, the air current is the pore of even number through quantity, and the sound wave can take place the phase offset, has obvious noise reduction effect.

Preferably, the annular end cover is hollow cylinder, and the lateral wall of PCB board is located to the cover, can prevent the production of electric arc, plays high-pressure isolation, damp-proofing effect, increases the degree of safety, the PCB board passes through the contact pin and connects stator module's bottom end, binding post's bottom run through in the upper and lower surface of PCB board.

Preferably, the PCB board is equipped with a plurality of negative pressure chamber through-holes that run through its upper and lower surface, negative pressure chamber through-hole distribute in being close to the position of PCB board cross section outward flange, the quantity of negative pressure chamber through-hole can be for 4, the cross section of negative pressure chamber through-hole is fan-shaped, and is adjacent distance between the negative pressure chamber through-hole equals, is convenient for dispel stator module with the heat that the rotor subassembly produced.

Preferably, the number of the fan blades is odd, and the number of the fan blades can be 13 or 15.

The second part of the invention provides a tank body which is used for assembly or lubrication and comprises a plurality of sine wave-shaped groove structures with shifted phases, the distances between adjacent grooves are equal, and the tank body can be applied to large and small structural equipment such as bearings, machine tools and the like which need to be bonded or lubricated; the moving part slides on the track, when the moving part passes through the groove with the sine wave structure, the flow speed of liquid (lubricating oil) in the groove is kept relatively stable, the liquid level is uniform, the liquid is coated and lubricated relatively uniformly between the moving part and the track, the friction force of the moving part is reduced sufficiently, and the precision of equipment is kept.

The invention has the beneficial effects that:

the distance value between the bottom of the front edge of the splitter blade and the bottom of the rear edge of the splitter blade is larger than the length value of the inner wall of the stator cavity shell in the axial direction, the rear edge of the splitter blade is superposed with one normal line of the cross section of the corresponding inner shell, the plane where the rear edge is located is superposed or parallel with the cross section of the inner shell, and the shape of the splitter blade and the angle design between the rear edge and the inner shell can increase the air volume and the air pressure generated by the fan; the second through holes pass through the top and the side wall of the boss, so that the top and the side wall of the boss are provided with notches, the heat dissipation positions of the boss are increased, the outflow of heat generated by the rotor assembly and the stator assembly during working is increased, and the heat dissipation positions and the third through holes of the high-pressure isolation pad have a synergistic heat dissipation effect; the negative pressure cavity through holes distributed at the position close to the outer edge of the cross section of the PCB can enhance the heat dissipation effect of the stator assembly and the rotor assembly when in work, heat can be sufficiently taken away through the air duct, secondary utilization of heat energy can be realized, when the negative pressure cavity through holes are applied to the field of hair dryers, the taken-away heat energy can cooperate with the heating function of the heating wire, the hair drying speed is accelerated, and the negative pressure cavity through holes are energy-saving and environment-friendly; the number of the splitter blades and the number of the pore channels are 8, the airflow passes through the pore channels with even number, the sound waves can be offset in phase, and the noise reduction effect is obvious; the bottom end of the mandrel does not penetrate through the magnet, so that a concave semi-embedded structure is formed, the mandrel is short and has small mass, the inertia of the rotor assembly during high-speed rotation can be reduced, the heat conduction area is increased, the core cover is made of high-temperature-resistant plastic, the mass is small, the installation of the core cover is facilitated by the cover eaves, negative pressure vacuum is formed among cavities of the plug, the mandrel and the magnet, the swing amplitude is small in the rotation process of the rotor assembly, the airflow disturbance can be reduced, the resistance is reduced, high-voltage arc discharge is prevented, the dustproof effect is achieved, and the service life of the fan is prolonged; the rotor assembly is provided with a groove body, a multi-lead thread structure is adopted, when the spindle drives the impeller to rotate at a high speed, friction force towards the bottom end of the spindle is generated between the impeller and the first groove, the impeller is prevented from flying out of the micro fan structure from the spindle, and the stability is good; the structure formed by the phase deviation of a plurality of sine waveforms is adopted for assembly, when the component is installed, glue is evenly distributed along the waveforms under the extrusion effect, the overflow of the glue can be prevented, the adhesive force is increased, the stress is even when the bearing component is cured, and the stability is increased; the high-voltage isolation pad in the inner shell can prevent the electric leakage of the air duct shell after the coil of the stator assembly is damaged, so that the safety of the air duct shell in the use process is improved; the annular end sleeve is sleeved on the outer side wall of the PCB, so that electric arcs can be prevented from being generated, high-voltage isolation and moisture prevention effects are achieved, and the safety degree is increased; the elastic member may apply a preload to the first and second balance rings, improving the performance of the bearing member, reducing the degree of wear, increasing the life span of the bearing member, and reducing noise generated when the rotor assembly rotates at high speed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a cross-sectional view of a micro fan according to the present invention;

FIG. 2 is an exploded view of the micro-blower of the present invention;

FIG. 3 is a front view of a micro fan according to the present invention;

FIG. 4 is a schematic view of the structure of the impeller and the housing of the present invention;

FIG. 5 is a schematic view of the structure of the annular end cap, PCB, terminal and housing of the present invention;

FIG. 6 is a schematic view of the inner casing and splitter vane of the present invention;

FIG. 7 is a schematic structural view of the outer casing, the inner casing, the first through hole and the second through hole of the present invention;

FIG. 8 is a schematic view of the structure of the boss, the first through hole and the second through hole in the present invention;

FIG. 9 is an enlarged schematic view of the high voltage isolation pad of the present invention;

FIG. 10 is a cross-sectional view of an impeller according to the present invention;

FIG. 11 is an enlarged schematic view of the core lid of the present invention;

FIG. 12 is an enlarged schematic view of a PCB board according to the present invention;

FIG. 13 is an enlarged schematic view of the first, second and third grooves of the impeller and the spindle of the present invention;

FIG. 14 is a schematic view of the assembled structure of the impeller, the first bearing, the second bearing and the spindle of the present invention;

FIG. 15 is a graph of part travel time versus face width for a prior art machine tool;

FIG. 16 is a graph of travel time of components versus face width of the channel in accordance with the present invention.

Labeled in the figure as: 1. an air duct housing; 2. an annular end sleeve; 3. a housing; 4. an inner shell; 5. a grounded male terminal; 6. a splitter blade; 7. a leading edge; 8. a trailing edge; 9. eyebrows; 10. a blade root; 11. a stator cavity housing; 12. a bearing cavity housing; 13. a high voltage isolation pad; 14. a boss; 15. a first through hole; 16. a second through hole; 17. a third through hole; 18. a mandrel; 19. an impeller; 20. a magnet; 21. a core cover; 22. a first bearing; 23. a second bearing; 24. a first gimbal ring; 25. a second gimbal ring; 26. an elastic member; 27. a cover body; 28. a plug; 29. covering an eaves; 30. a PCB board; 31. a wiring terminal; 32. inserting a pin; 33. a negative pressure cavity through hole; 34. a stator assembly; 35. an iron core; 36. encapsulating the stator; 37. a coil; 38. a first groove; 39. a second groove; 40. a third groove; 41. a central bore; 42. \36674; 43. a fan blade; 44. a first nose; 45. a second nose.

Detailed Description

In the description of the present invention, it should be noted that the terms "top end", "bottom end", "upper", "lower", "inner", "outer", "horizontal", etc. indicate positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience in describing the invention and simplifying the description, but do not indicate or imply that the positions or elements referred to must have specific orientations for orientation construction and operation, and thus, should not be construed as limiting the present invention.

Examples

According to a first aspect of the present invention, there is provided a micro fan as shown in fig. 1 to 14, comprising a duct housing 1, an impeller 19, and a motor;

the air duct casing 1 comprises an outer shell 3, the outer shell 3 is in a hollow cylindrical shape, a grounding male terminal 5 is arranged on the outer side wall of the bottom of the outer shell 3, the inner surface of the outer shell 3 is connected with the outer surface of an inner shell 4 through a plurality of splitter blades 6, the splitter blades 6 radially surround the inner shell 4, an air duct formed between the outer shell 3 and the inner shell 4 is divided into a plurality of same ducts by the splitter blades 6, the inner shell 4 is used for supporting a stator assembly 34 and a rotor assembly of a motor, the number of the splitter blades 6 and the number of the ducts are 8, heat generated by a micro fan in the working process can be sufficiently taken away through the air duct to carry out secondary utilization of heat energy, when the air duct casing is applied to the field of hair dryers, the taken-out heat energy can cooperate with heat energy of a heating wire, the hair drying speed is increased, and the air duct casing is energy-saving and environment-friendly; the air flow passes through the even number of pore channels, the sound waves can be offset in phase, and the noise reduction effect is obvious.

The splitter blade 6 comprises a front edge 7, a rear edge 8, a blade arch 9 and a blade root 10, the rear edge 8 is superposed with a normal line of the cross section of the corresponding inner shell 4, the plane where the rear edge 8 is located is parallel to or superposed with the cross section of the inner shell 4, the angle between the rear edge 8 and the inner shell 4 is designed, and the distance value from the bottom of the front edge 7 to the bottom of the rear edge 8 of the splitter blade 6 is larger than the length value of the inner wall of the stator cavity shell 11 in the axial direction, so that the air volume and the air pressure of the micro-fan during working are obviously increased.

The inner shell 4 comprises a stator cavity shell 11 and a bearing cavity shell 12, the stator cavity shell 11 is a hollow cylinder with a uniform inner diameter, the stator assembly 34 is arranged inside the stator cavity shell 11, the bottom end of the bearing cavity shell 12 is connected with the top end of the stator cavity shell 11, a cylindrical boss 14 is axially extended from the top end of the bearing cavity shell 12, a first through hole 15 axially penetrates through the bearing cavity shell 12 and the boss 14, the inner diameter of the stator cavity shell 11 is larger than that of the first through hole 15, the central axes of the bearing cavity shell 12 and the boss 14 are overlapped with that of the first through hole 15, the outer diameter of the boss 14 is smaller than that of the bearing cavity shell 12, a plurality of second through holes 16 are axially arranged on the cross section of the bearing cavity shell 12, the second through holes 16 are distributed on the periphery of the first through hole 15, one end of each second through hole 16 extends to the top end of the boss 14, the cross section area of each second through hole 16 on the boss 14 is smaller than that of the second through hole 16, the second through the side wall of the boss 14, so that gaps are formed on the top and the side walls of the boss 14, the bosses, the heat dissipation of the stator assembly and the heat sink 34 are increased, and the heat of the rotor assembly can be conveniently used in the field of the energy-saving hair dryer, and the environment-saving blower, and drying the environment-saving blower.

The upper surface at stator module 34's top end passes through high-pressure isolation pad 13 and connects the lower surface at bearing housing 12 bottom end, high-pressure isolation pad 13 is the ring form pad body, high-pressure isolation pad 13 is equipped with a plurality of third through-holes 17 that run through its upper and lower surface, third through-hole 17 is the same with the coaxial setting of second through-hole 16 and quantity, the internal diameter of third through-hole 17 and second through-hole 16 is the same, the heat dissipation effect in coordination has, if stator module 34's coil has the emergence and damages, when closely producing electric arc, high-pressure isolation pad 13 can prevent wind channel casing 1 electric leakage, increase its security in the use, the quantity of third through-hole 17 can be four, the distance between the adjacent third through-hole 17 equals.

The rotor assembly comprises a mandrel 18, a bearing component and a magnet 20, wherein the bearing component is installed on the inner wall of a bearing cavity shell 12, the bearing cavity shell 12 supports the rotor assembly at the position of the bearing component, the balance degree of the miniature fan is increased, the magnet 20 is arranged in a cavity gap of the stator assembly 34, one end of the mandrel 18 sequentially penetrates through a central hole 41 of the impeller 19 and the bearing component and is inserted into the magnet 20, the distance from the top end of the mandrel 18 to the bottom end of the mandrel 18 is smaller than the distance from the top end of the mandrel 18 to the bottom end of the magnet 20, and the bottom end of the mandrel 18 does not penetrate through the magnet 20, so that a concave semi-embedded structure is formed. The impeller 19 is located outside the bearing chamber housing 12 and when the spindle 18 rotates, the impeller 19, the bearing member and the magnet 20 all rotate synchronously.

The outer side wall of the mandrel 18 is provided with a rotor assembly groove body used for coating an adhesive, the rotor assembly groove body comprises a first groove 38, a second groove 39 and a third groove 40, the first groove 38 is of a multi-lead threaded structure, the impeller 19 is sleeved on the outer side wall of the top end of the mandrel 18, the first groove 38 is connected with the inner side wall of the central hole 41 through the adhesive, when the mandrel 18 drives the impeller 19 to rotate at a high speed, under the action of rotating force, friction force towards the bottom end of the mandrel 18 is generated between the impeller 19 and the first groove 38, the impeller 19 is prevented from flying out of the micro-fan structure from the mandrel 18, the stability of the micro-fan structure is improved, the second groove 39 and the third groove 40 are formed by phase deviation of a plurality of sine wave-shaped groove structures, the second groove 39 and the third groove 40 are both connected with a bearing component through the adhesive, liquid glue is dripped into the second groove 39 and the third groove 40 of the sine wave-shaped structure, when the bearing component is mounted on the mandrel 18, the glue is uniformly shunted along the sine wave-shaped structures, the glue is prevented from being dripped outside, the adhesive force is prevented, the bonding force is increased, and the stress of the bearing component is uniformly solidified, and the stress is improved, and the stress of the bearing component is improved, and the stress is uniformly.

The bearing component comprises a first bearing 22, a second bearing 23 and a pressing piece arranged between the first bearing 22 and the second bearing 23, the first bearing 22 and the second bearing 23 are sleeved on the outer side wall of the mandrel 18, the second groove 39 is connected with the inner side wall of the first bearing 22 through an adhesive, and the third groove 40 is connected with the inner side wall of the second bearing 23 through an adhesive. The abutting part comprises a first balance ring 24, a second balance ring 25 and an elastic part 26 arranged between the first balance ring 24 and the second balance ring 25, two ends of the elastic part 26 are respectively in abutting contact with the lower surface of the first balance ring 24 and the upper surface of the second balance ring 25, the elastic part 26 can apply preload to the first balance ring 24 and the second balance ring 25, the performance of the bearing part is improved, the service life of the bearing part is prolonged, the elastic part 26 can be a spring, the spring is not in direct contact with the first bearing 22 and the second bearing 23, the abrasion can be reduced, and meanwhile, noise generated when the rotor assembly rotates at a high speed can be reduced.

The bottom end of wind channel casing 1 is equipped with annular pot head 2, and annular pot head 2 is inside to be equipped with PCB board 30, and annular pot head 2 is hollow circular cylinder, and the lateral wall of PCB board 30 is located to the cover, can prevent the production of electric arc, plays high-pressure isolation, damp-proofing effect, increases the degree of safety, and PCB board 30 passes through the bottom end that stator module 34 is connected to contact pin 32, and binding post 31's bottom runs through in PCB board 30's upper and lower surface. The PCB board 30 is provided with a plurality of negative pressure cavity through holes 33 which penetrate through the upper surface and the lower surface of the PCB board, the negative pressure cavity through holes 33 are distributed at the position close to the outer edge of the cross section of the PCB board 30, the number of the negative pressure cavity through holes 33 can be 4, the cross section of each negative pressure cavity through hole 33 is fan-shaped, and the distance between the adjacent negative pressure cavity through holes 33 is equal, so that heat generated by the stator assembly 34 and the rotor assembly can be conveniently dissipated.

The impeller 19 comprises a wing 36674and a plurality of fan blades 43, wherein the upper surface and the lower surface of the wing 36674are respectively provided with a first raised head 44 and a second raised head 45, so that the bonding area of the impeller 19 and the mandrel 18 can be increased, the stability is improved, the central hole 41 is arranged in the first raised heads 44, the wing 3667442 and the second raised head 45 in a penetrating way, the central axes of the first raised head 44, the second raised head 45 and the central hole 41 are superposed, and the fan blades 43 are of a two-dimensional curved surface structure. The number of the fan blades 43 is an odd number, and may be 13 or 15.

The motor is a three-phase brushless DC motor and adopts six-slot two poles.

The second part of the invention provides a groove body which is applied to assembly or lubrication, comprises a plurality of phase-shifted sine-wave-shaped groove structures and can be applied to large and small structural equipment needing bonding or lubrication, such as bearings, machine tools and the like.

The liquid glue is dripped into the grooves of the sine wave-shaped structure when the component is installed, and is uniformly distributed along the wave shape under the extrusion action of the glue, so that the overflow of the component can be prevented, the adhesive force is increased, and the stress is uniform when the component is cured; the groove body is designed at the sliding guide rail, the groove body is generally provided with a lubricating effect, a moving part slides on the rail, lubricating oil in the groove body is attached to the surface of the guide rail, and flows along the moving direction of the part, so that the part and the guide rail are lubricated.

The shape of a lubricating groove body of a conventional machine tool is generally a broken line structure shown in fig. 15, wherein an abscissa t represents time, an ordinate w represents surface width, and a distance of a broken line between a and B represents a length of the groove body, when a moving part slides on a sliding rail in a one-way or back and forth way, the length of the groove body passing through a unit time is different, especially when the moving part moves to the vicinity of an inflection point of the groove body, the distance of the groove body passing through the unit time is changed greatly, so that the flow rate of lubricating oil in the groove body is also changed violently, the larger the flow rate of the lubricating oil is, the poorer the continuity of the flowing of the lubricating oil is, the non-uniform lubrication is caused, and the precision of the machine tool is easy to reduce when the machine tool works for a certain time due to poor lubrication effect.

The groove body is of a plurality of phase-shifted sine waveform structures, one of the sine waveform structures is shown in figure 16, the abscissa t represents time, the ordinate w represents surface width, the curve distance from A to B represents the length of one sine waveform structure of the groove body, the grooves of the sine waveform structures are arranged in a translation mode, the distances between adjacent grooves are equal, when a moving part slides on a sliding rail in a one-way or back-and-forth mode, the total length of the groove body passing through a unit time is kept relatively stable, the flow rate of lubricating oil is kept relatively stable, the liquid level of the lubricating oil is relatively uniform, the lubricating effect is good, the friction force between the part and the sliding rail in the moving process can be fully reduced, and the machine tool can keep good precision.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro fan is characterized by comprising an air duct shell, an impeller and a motor;

the air duct casing comprises an outer shell, a grounding male terminal is arranged on the side wall of the bottom of the outer shell, the inner surface of the outer shell is connected with the outer surface of an inner shell through a plurality of splitter blades, an air duct formed between the outer shell and the inner shell is divided into a plurality of same pore passages by the splitter blades, the inner shell is used for supporting a stator assembly and a rotor assembly of the motor,

the splitter blade comprises a front edge, a back edge, a blade eyebrow and a blade root, the back edge is superposed with a normal of the cross section of the corresponding inner shell,

the inner shell comprises a stator cavity shell and a bearing cavity shell, the stator component is arranged in the stator cavity shell, the upper surface of the top end of the stator component is connected with the lower surface of the bottom end of the bearing cavity shell through a high-pressure isolation pad, the bottom end of the bearing cavity shell is connected with the top end of the stator cavity shell, the top end of the bearing cavity shell extends axially to form a cylindrical boss, the bearing cavity shell and the boss axially penetrate through a first through hole, the outer diameter of the boss is smaller than the outer diameter of the bearing cavity shell, a plurality of second through holes are arranged on the cross section of the bearing cavity shell axially, one end of each second through hole extends to the top end of the boss through the side wall of the boss,

the rotor assembly comprises a mandrel, a bearing component and a magnet, the bearing component is installed on the inner wall of the bearing cavity shell, the magnet is arranged in a cavity gap of the stator assembly, one end of the mandrel sequentially penetrates through a central hole of the impeller and the bearing component and is inserted in the magnet, the distance from the top end of the mandrel to the bottom end of the mandrel is smaller than the distance from the top end of the mandrel to the bottom end of the magnet,

the outer side wall of the mandrel is provided with a rotor assembly groove body used for coating an adhesive, the rotor assembly groove body comprises a first groove, a second groove and a third groove, the first groove is of a multi-lead thread structure, the first groove is connected with the inner side wall of the center hole through the adhesive, the second groove and the third groove are formed by phase deviation of a plurality of sine wave groove structures, the second groove and the third groove are connected with the bearing component through the adhesive,

the bottom end of the air duct shell is provided with an annular end sleeve, a PCB is arranged inside the annular end sleeve,

the impeller comprises a wing 36674and a plurality of fan blades, the upper surface and the lower surface of the wing 36674are respectively provided with a first raised head and a second raised head, the central hole is arranged in the first raised head, the wing 36674and the second raised head in a penetrating way, and the fan blades are of a quadratic curved surface structure,

the motor is a three-phase brushless DC motor and adopts six-slot two poles.

2. The micro-blower of claim 1, wherein the bearing assembly includes a first bearing, a second bearing, and a pressing member disposed between the first bearing and the second bearing, the second groove is connected to an inner sidewall of the first bearing by an adhesive, and the third groove is connected to an inner sidewall of the second bearing by an adhesive.

3. The micro-blower of claim 2, wherein the pressing member includes a first balance ring, a second balance ring, and an elastic member disposed between the first balance ring and the second balance ring, and both ends of the elastic member are respectively in pressing contact with a lower surface of the first balance ring and an upper surface of the second balance ring.

4. The micro fan as claimed in claim 1, wherein a core cover is inserted into a bottom of the stator assembly, the core cover includes a cylindrical cover body and a plug coaxially disposed with the cover body, one end of an outer side wall of the cover body extends radially to form a cap edge, and the plug is disposed in a cavity gap at a bottom end of the magnet.

5. The micro air blower according to claim 1, wherein the high-pressure isolation pad is a circular pad body, the high-pressure isolation pad is provided with a plurality of third through holes penetrating through the upper surface and the lower surface of the high-pressure isolation pad, the third through holes and the second through holes are coaxially arranged and have the same number, the inner diameters of the third through holes and the second through holes are the same, and the distances between the adjacent third through holes are the same.

6. The micro fan of claim 1, wherein a distance between the leading bottom of the splitter blade and the trailing bottom is greater than a length of the inner wall of the stator cavity housing in an axial direction, and wherein the number of the splitter blade and the duct is 8.

7. The micro fan as claimed in claim 1, wherein the annular end cap is a hollow cylinder, the PCB is connected to the bottom end of the stator assembly through a pin, and the bottom of the terminal passes through the upper and lower surfaces of the PCB.

8. The micro air blower according to claim 1, wherein the PCB board is provided with a plurality of negative pressure cavity through holes penetrating upper and lower surfaces thereof, the cross section of the negative pressure cavity through holes is fan-shaped, and distances between the adjacent negative pressure cavity through holes are equal.

9. The micro-blower of claim 1, wherein the number of the fan blades is an odd number, and may be 13 or 15.

10. A groove body is used for assembly or lubrication and is characterized by comprising a plurality of sine wave-shaped groove structures with phase deviation.