Foreign matter prevention device of fan

Abstract

The invention provides a foreign matter prevention device of a fan, a fan frame comprises an accommodating space for assembling a fan wheel, a shaft seat, a shaft seat disc, a shaft seat support and a fan air outlet, the accommodating space in the shaft seat of the fan frame is used for assembling the fan wheel, and a shaft sleeve part is convexly arranged on the shaft seat disc in the shaft seat in the accommodating space and is used for assembling a preset rotating shaft; a plurality of fan blades are annularly arranged on the outer surface of a hub of the fan wheel, a preset rotating shaft penetrates through the inner space of the hub, a flow guide part is arranged on the surface of the top of the hub and surrounds the outer portion of the preset rotating shaft, and the flow guide part forms more than one air channel between the inner ring face of a flow guide ring and a flow guide protruding rib. One side of the air duct is an air inlet groove for guiding air in the internal space of the hub to enter, and the other side of the air duct forms an airflow steering curved surface capable of extruding and guiding airflow and discharging hot air outwards and downwards; when the fan runs, air flow exhausted by the air flow turning curved surface enables the air outlet of the inner space of the hub to form positive pressure relative to the outer space so as to prevent dirty air from entering the inner space.

Description

Technical Field

[0001] The present invention relates to a foreign object prevention device for a fan, and particularly to a foreign object prevention device for a fan that can discharge foreign objects inside the fan wheel to the outside. A driving unit is installed between the fan frame and the fan wheel, and a packaging layer is formed outside the circuit board and the wound stator of silicon steel sheets of the driving unit. By the rotation of a plurality of guiding portions at the bottom of the inner space of the fan wheel, the air in the hub circulates and is discharged in the inner space, so as to prevent dirty air with dust, salt, etc. in the external space from entering the inner space, so as to keep the fan wheel operating normally and extend the service life. Background Art

[0002] Nowadays, computer computing functions are powerful and their speeds are rapidly increasing to enhance the execution efficiency of the computer. However, due to various electronic components such as the central processing unit (CPU), image processor, power supply, or various interface cards inside the computer host, because they have super-high-speed computing functions, when various electronic components process computing instructions, they will generate relatively high-temperature heat energy, which also causes the temperature inside the computer host to rise. Through heat dissipation devices, fans, etc. that assist various electronic components in heat dissipation, the fan usually has a fan frame, a fan wheel, a circuit board, and a rotor and a stator of a driving motor inside. However, during the operation of the fan, in order to drive the fan wheel to rotate for blowing or exhausting air by the motor installed between the fan wheel and the fan frame, when the motor drives the fan wheel to rotate, the high-speed rotation of the fan wheel easily guides the water vapor evaporated from the external heat energy into the fan wheel, and thus easily brings foreign objects (such as water vapor, salt mist, or dust, etc.) existing around the fan or various electronic components into the inside, and accumulates inside the fan wheel and the fan frame. Over time, it is easy to affect the abnormal operation of the fan wheel, resulting in easy failure of the fan and shortening of the service life.

[0003] However, the data that currently needs to be stored, transmitted, and calculated for the functions applied to servers is becoming increasingly large. Therefore, as the computing function of the central processing unit (CPU) applied to servers improves, the heat generated also increases. Correspondingly, the temperature difference, heat conductivity, and wattage also increase simultaneously. For the fan used to cool the central processing unit (CPU) of the server, it is necessary to dissipate the increased wattage of the server through the fan. Under the existing height dimension (1U or 2U) specification of the fan, only by increasing the rotation speed of the fan can the heat dissipation efficiency of the fan be increased. Then, it is necessary to increase the wattage of the fan motor to cope with the increased rotation speed of the fan. However, when increasing the wattage of the motor, the enameled wire of the motor is likely to be burned due to high temperature, posing a relatively high risk. In order to prevent the fan from bringing external water vapor, salt spray, etc. into the fan during high-speed rotation, which may affect the rust, oxidation, etc. of the rotor (magnetic body), stator (silicon steel sheet and enameled wire winding), and circuit board of the driving motor, thereby affecting the operation of the driving motor. In order to prevent the driving motor from being affected by water vapor, salt spray, etc., usually, a coating or potting treatment is carried out on the outside of the stator and the circuit board to block the invasion of external water vapor, salt spray, etc. into the driving motor. Although it can avoid the failure and damage of the driving motor, etc., when the fan wheel rotates, it is also easy to bring foreign matters (such as water vapor, salt spray, or dust, etc.) existing around the fan or various electronic components into the interior. This not only easily affects the normal operation of the driving motor, but also the foreign matters are still likely to accumulate in the air gap between the magnet and the silicon steel sheet. After long-term accumulation, it will also affect the smooth rotation of the fan wheel, making it easier for the fan to malfunction and shortening the service life of the fan. There is indeed a need for improvement.

[0004] Thus, how to solve the problem and trouble that the service life of the fan of the heat dissipation device for assisting various electronic components is affected by foreign matters brought in by external airflows currently, and the troubles and deficiencies such as the foreign matters accumulated inside the fan are not easy to be removed, and the temperature of the driving unit is not easy to be dissipated due to high temperature generated by high-speed rotation, etc., are the directions that the relevant manufacturers in this industry are eager to research and improve. Summary of the Invention

[0005] Therefore, in view of the above problems and deficiencies, the main object of the present invention is to provide an anti-foreign matter device for a fan.

[0006] The present invention provides a foreign object prevention device for a fan. A plurality of fan blades are annularly arranged on the outer surface of the hub of the fan wheel, and a preset rotating shaft is disposed through the inner space. A flow guiding portion is provided on the top surface of the inner space and surrounds the outside of the preset rotating shaft. The flow guiding portion is composed of a flow guiding ring and more than one flow guiding rib. An air duct is formed between the inner circumferential surface of the flow guiding ring and the flow guiding rib. One side of the air duct is an air inlet groove for guiding the air in the inner space to enter, and the other side forms an air flow turning surface for squeezing and guiding the air flow and then turning it outward to discharge the hot air, so that a positive pressure is formed at the air outlet of the inner space relative to the outer space, preventing the dirty air with dust, salt, etc. in the outer space from entering the inner space, resulting in the accumulation of foreign objects such as dust and salt between the air gap of the fan motor stator and rotor or the gap between the bearing and the rotating shaft, causing the fan to stop running; The fan frame includes a receiving space for assembling the fan wheel, a shaft seat, a shaft seat disc, a shaft seat bracket and a fan air outlet. The receiving space inside the shaft seat of the fan frame is used for assembling the fan wheel. A shaft sleeve portion is convexly provided on the shaft seat disc in the shaft seat inside the receiving space for assembling the preset rotating shaft. Then, the shaft seat disc in the shaft seat is closed, leaving only the gap between the fan blade hub and the bottom of the fan frame, so as to achieve the purpose of isolating the air in the outer space from entering the inner space, avoiding the dirty air with dust, salt, etc. in the outer space from entering the inner space, resulting in the accumulation of foreign objects such as dust and salt between the air gap of the fan motor stator and rotor or the gap between the bearing and the rotating shaft, causing the fan to fail and stop running.

[0007] Among them, the flow guiding portion is provided with a flow guiding ring and a plurality of flow guiding ribs surrounding the outside of the preset rotating shaft. A rotor magnet is provided on the wall surface below the flow guiding ring in the inner space of the hub. An air duct is formed in the space between the flow guiding ribs of the flow guiding portion and the inner circumferential surface of each flow guiding ring of the flow guiding portion, which extends from the outside of the rotating shaft pivot seat to the inner circumferential surface of each flow guiding ring in a gradually narrowing manner. An air inlet groove for guiding the external air flow to enter is formed in the wide space on one side of the air duct, and an air flow turning surface for guiding the air flow and squeezing it downward and outward to discharge is formed in the narrow space on the other side of the air duct.

[0008] Among them, the flow guiding portion is provided with the flow guiding ring and the plurality of flow guiding ribs surrounding the outside of the preset rotating shaft. A rotor magnet is provided on the wall surface below the flow guiding ring in the inner space of the hub. The inner circumferential surface of the flow guiding ring is flush with the inner circumferential surface of the rotor magnet and is provided with an overflow space for the smooth flow of hot air. More than one space that gradually narrows, then widens, and then narrows is formed between each flow guiding rib of the flow guiding portion and the adjacent flow guiding rib connecting to the adjacent flow guiding ring. The flow guiding rib extends from the outside of the rotating shaft pivot seat to the inner circumferential surface of the flow guiding ring along a parabolic path and is connected in an approximate tangent manner to form more than one air duct. The air inlet groove for guiding the air in the inner space of the hub to enter is formed in the narrow-to-wide space on the side of the air duct close to the rotating shaft pivot seat, and the air flow turning surface for guiding the air flow and squeezing it downward and outward to discharge is formed at the narrowest space in the wide-to-narrow space on the other side of the air duct.

[0009] Wherein, the impeller is provided with rotor magnets on the wall surface of the inner space of the hub. Opposite to the rotor magnets, a plurality of stator silicon steel sheet groups of a preset motor are provided outside the shaft seat of the fan frame. Each stator silicon steel sheet group includes a plurality of inner silicon steel sheets, a plurality of outer silicon steel sheets, and an enameled wire winding wound between the plurality of inner silicon steel sheets and the plurality of outer silicon steel sheets. Then, an air flow duct is formed between the plurality of outer silicon steel sheets, the enameled wire winding of each stator silicon steel sheet group and the inner silicon steel sheet shaft seat, and a leakage flow space is formed between the rotor magnets and the plurality of outer silicon steel sheets.

[0010] Wherein, each stator silicon steel sheet group includes a plurality of inner silicon steel sheets, a plurality of outer silicon steel sheets, and an enameled wire winding wound between the plurality of inner silicon steel sheets and the plurality of outer silicon steel sheets. The plurality of stator silicon steel sheet groups and the circuit board can be provided with a coating or potting operation for isolating air, dust prevention, and waterproofing to form a protective layer.

[0011] Wherein, the shaft seat inside the fan frame is in a U-shaped or C-shaped mode. The inner space of the U-shaped shaft seat is convexly provided with a shaft sleeve part, and a circuit board is sleeved outside the shaft sleeve part. In addition, for the C-shaped shaft seat, a circuit board is arranged on the outer side of the bottom of the C-shaped shaft seat. In addition, the shaft seat extends downward to form a receiving space, and a static impeller pressure plate or a shaft seat disc bracket extends radially outward from the receiving space.

[0012] Wherein, the foreign object prevention device of the fan includes an impeller and a fan frame. The impeller includes a hub and a plurality of fan blades annularly arranged on its outer surface. The hub is provided with an inner space with a preset rotating shaft bearing seat. The top surface of the inner space is provided with a guiding part surrounding the outside of the preset rotating shaft bearing seat. One or more air ducts are formed in the space between one or more guiding ribs of the guiding part and the guiding ring of the guiding part. Then, an air inlet groove for guiding the air in the inner space of the hub to enter is formed on one side of the air duct, and an air flow turning surface for guiding the air in the inner space of the hub and being squeezed and discharged outward is formed on the other side. The fan frame includes a receiving space for assembling the impeller, a shaft seat, a shaft seat disc, a shaft seat bracket, and an air outlet. An inner shaft sleeve part is arranged on the shaft seat disc inside the shaft seat. A receiving space for assembling the rotating shaft bearing seat of the impeller is arranged inside the shaft sleeve part. That is, a rotating shaft for assembling the preset rotating shaft bearing seat is convexly arranged inside the receiving space of the shaft sleeve part of the shaft seat. Then, the shaft seat disc inside the shaft seat is closed. After the impeller is assembled into the receiving space of the fan frame, only the gap between the hub of the impeller and the shaft seat disc of the fan frame or the gap between the hub and the circuit board on the shaft seat disc (i.e., the air outlet of the inner space of the hub) is left, so that when the fan rotates, a positive pressure is formed at the air outlet of the inner space of the hub relative to the external space, preventing the dirty air with dust, salt, etc. in the external space from entering the inner space of the hub and causing the fan to stop operating.

[0013] Among them, the flow guiding part is provided with the flow guiding ring and the plurality of flow guiding ribs surrounding the outside of the preset rotating shaft bearing seat, and a rotor magnet is provided on the wall surface below the flow guiding ring in the inner space of the hub. A wind channel is formed in the space between the flow guiding ribs of the flow guiding part and the flow guiding ring of each flow guiding part, extending from the outside of the rotating shaft pivot seat to the inner circumferential surface of each flow guiding ring from wide to narrow. An air intake groove for guiding the air flow inside the hub to enter is formed in the wide space on one side of the wind channel, and an air flow turning surface for guiding the air flow and squeezing it to be discharged downward and outward is formed in the narrow space on the other side of the wind channel.

[0014] Among them, the flow guiding part is provided with the flow guiding ring and the plurality of flow guiding ribs surrounding the outside of the preset rotating shaft bearing seat, and a rotor magnet is provided on the wall surface below the flow guiding ring in the inner space of the hub. The inner circumferential surface of the flow guiding ring is flush with the inner circumferential surface of the rotor magnet to form an escape space for the hot air to flow smoothly between the plurality of outer silicon steel sheets. More than one space from narrow to wide and then to narrow is formed between each flow guiding rib of the flow guiding part and the adjacent flow guiding rib connecting the adjacent flow guiding rings. The flow guiding rib extends from the outside of the rotating shaft pivot seat to the inner circumferential surface of the flow guiding ring in a parabolic path and is connected in an approximate tangent to form more than one wind channel. An air intake groove for guiding the air in the inner space of the hub to enter is formed in the narrow-to-wide space on the side of the wind channel close to the rotating shaft pivot seat, and an air flow turning surface for guiding the air flow and squeezing it to be discharged downward and outward is formed at the narrowest space in the wide-to-narrow space on the other side of the wind channel.

[0015] Among them, the impeller is provided with a rotor magnet on the wall surface of the inner space of the hub. Opposite to the rotor magnet, a plurality of stator silicon steel sheet groups of a preset motor are provided outside the bushing part of the shaft seat of the fan frame. Each stator silicon steel sheet group includes a plurality of inner silicon steel sheets, a plurality of outer silicon steel sheets, and an enameled wire winding wound between the plurality of inner silicon steel sheets and the plurality of outer silicon steel sheets. An air flow channel is formed between the plurality of inner silicon steel sheets, the plurality of outer silicon steel sheets, and the enameled wire winding of each stator silicon steel sheet group, and an escape space is formed between the rotor magnet and the plurality of outer silicon steel sheets.

[0016] Among them, a circuit board for electrically connecting each stator silicon steel sheet group of the preset motor is provided outside the bushing part of the inner shaft seat of the fan frame, and an air flow channel for the air flow to pass through is formed on the circuit board. The air flow channel can be provided on the circuit board or between the circuit board and the bushing part of the shaft seat. The inner shaft seat of the fan frame is in a U shape or an inverted U shape. The accommodating space inside the shaft seat in the U shape is convexly provided with a bushing part, and a circuit board is sleeved outside the bushing part. In addition, for the shaft seat in the inverted U shape, a circuit board is provided below the bottom of the shaft seat in the inverted U shape.

[0017] Among them, the shaft seat is extended downward with a receiving space, and a static impeller pressure plate or a shaft seat disc bracket is extended radially outside the receiving space.

[0018] Advantages of the present invention: When the fan is operating, the air flow discharged from the air flow turning curved surface will cause a positive pressure at the air outlet of the inner space of the hub relative to the outer space, thereby preventing the dirty air in the outer space from entering the inner space, and preventing the dirty air with dust, salt, etc. in the outer space from entering the inner space of the hub, resulting in the accumulation of foreign matters such as dust and salt in the air gap between the stator silicon steel sheet group and the rotor magnet of the fan motor or in the gap between the bearing and the rotating shaft, and causing the fan to fail and stop operating. Description of the Drawings

[0019] Figure 1 It is a perspective external view of the first embodiment of the fan wheel of the present invention.

[0020] Figure 2 It is a schematic plan view of the first embodiment of the fan wheel of the present invention.

[0021] Figure 3 It is a perspective external view of the fan frame of the present invention.

[0022] Figure 4 It is a top view of the fan frame and the stator silicon steel sheet group of the present invention.

[0023] Figure 5 It is a side sectional view of the first embodiment of the present invention (coated and with an air flow duct).

[0024] Figure 6 It is a perspective external view of the second embodiment of the fan wheel of the present invention.

[0025] Figure 7 It is a side sectional view of the second embodiment of the present invention (coated and with an air flow duct).

[0026] Figure 8 It is a side sectional view of the third embodiment of the present invention (potted and without an air flow duct).

[0027] Figure 9 It is a side sectional view of the fourth embodiment of the present invention (potted and without an air flow duct).

[0028] Figure 10 It is a bottom view of the fan wheel of the second embodiment of the fan wheel of the present invention.

[0029] Figure 11 It is a side sectional view of the fan wheel of the first embodiment of the fan wheel of the present invention.

[0030] Figure 12 For the present invention Figure 11 Partial enlarged view of part a.

[0031] Figure 13 It is a side sectional view of the fifth embodiment of the present invention (coated and with an air flow duct).

[0032] Figure 14 Side view sectional view (with potting and without air flow duct) of the sixth embodiment of the present invention.

[0033] Description of reference numerals: 1 - fan wheel; 11 - hub; 110 - internal space; 111 - wall surface; 112 - rotating shaft bearing seat; 1120 - bearing hole; 113 - wear-resistant lining gasket; 12 - fan blade; 13 - guiding part; 130 - air duct; 131 - air intake groove; 132 - air flow turning surface; 133 - guiding rib; 1332 - rotating shaft pivot seat; 1333 - inner ring surface of guiding rib; 1334 - outer ring surface of guiding rib; 134 - guiding ring; 1341 - inner ring surface of guiding ring; 14 - rotor magnet; 140 - overflow space; 141 - inner ring surface of rotor magnet; 142 - air outlet of inner space of hub; 2 - fan frame; 20 - accommodating space; 21 - shaft seat; 210 - receiving space; 211 - shaft sleeve part; 212 - positioning shaft hole; 213 - shaft seat disc bracket; 214 - fan air outlet; 215 - static impeller pressure plate; 216 - shaft seat cover; 22 - circuit board; 220 - air flow channel; 23 - shaft seat disc; 3 - rotating shaft; 31 - bearing; 32 - end; 33 - recessed groove; 34 - snap ring; 340 - inner shaft hole; 4 - motor; 40 - air flow duct; 41 - stator silicon steel sheet group; 410 - air flow passage; 411 - inner silicon steel sheet; 412 - outer silicon steel sheet; 413 - enameled wire winding; 42 - protective layer. Detailed implementation manners

[0034] To achieve the above objects and effects, the technical means, its structure, implementation methods, etc. adopted by the present invention are now described in detail in conjunction with the drawings for the preferred embodiments of the present invention, and its features and functions are as follows, so as to facilitate a complete understanding.

[0035] Please refer to Figures 1 to 14 As shown, it can be clearly seen from the figure that the fan wheel heat dissipation structure of the fan of the present invention includes: a fan wheel 1 and a fan frame 2 (please also refer to Figure 5 shown, with coating, having an air flow duct 40), wherein:

[0036] The fan wheel 1 includes a hub 11 and a plurality of fan blades 12 annularly arranged on its outer surface. An internal space 110 is provided inside the hub 11, and a rotor magnet 14 is provided at the wall surface 111 of the internal space 110 and a preset rotating shaft 3 can be inserted therethrough. A guiding portion 13 is provided on the top surface of the internal space 110 around the outside of the preset rotating shaft 3. The guiding portion 13 is composed of one or more guiding ribs 133 and a guiding ring 134. An air duct 130 is formed between the inner circumferential surface 1341 of the guiding ring and the guiding ribs 133. On one side of the air duct 130 is an air inlet groove 131 for guiding the air in the internal space 110 to enter, and on the other side is an air flow turning surface 132 for squeezing and guiding the air flow and then turning it outward and downward to discharge the hot air, so that a positive pressure is formed at the air outlet of the internal space 110 relative to the external space to prevent the dirty air with dust, salt, etc. in the external space from entering the internal space 110, resulting in the accumulation of foreign matters such as dust and salt between the stator silicon steel sheet group 41 of the fan motor 4 and the rotor magnet 14 or in the gap between the bearing 31 and the rotating shaft 3, and causing the fan to stop running.

[0037] Please refer to Figure 2 FIG. is a three-dimensional schematic diagram of the first embodiment of the fan wheel of the present invention and is paired with all finished product embodiment diagrams. A rotor magnet 14 is provided on the wall surface below the guiding ring 134 of the internal space 110 of the hub 11, and the inner circumferential surface 1341 of the guiding ring is flush and connected with the inner circumferential surface 141 of the rotor magnet to facilitate the smooth flow of the air flow through the escape space 140, and one or more spaces that become narrower from wide are formed between each guiding rib 133 of the guiding portion 13 and the guiding ring 134 of the guiding portion 13, that is, the guiding rib 133 extends from the outside of the rotating shaft pivot seat 1332 along a parabolic path to the inner circumferential surface 1341 of the guiding ring and is connected in an approximately tangential manner to form one or more air ducts 130. An air inlet groove 131 for guiding the external air flow to enter is formed in the wide space on one side of the air duct 130, and the air flow turning surface 132 for guiding the air flow and squeezing it downward and outward is formed in the narrow space on the other side of the air duct 130. An escape space 140 is formed between the inner circumferential surface 141 of the rotor magnet and the outer silicon steel sheet 412 for the squeezed hot air to be discharged outward.

[0038] The interior of the fan frame 2 is provided with a receiving space 20 for assembling the fan wheel 1. That is, at the center of the shaft seat 21 inside the receiving space 20, there is a shaft seat disc 23. Around the shaft seat disc 23, there are brackets and air outlets. A shaft sleeve portion 211 protrudes from the center of the shaft seat disc 23, and a preset rotating shaft 3 can be assembled at the center of the shaft sleeve portion 211. Then, the inner space 110 of the hub 11 is aligned with the bottom of the receiving space 20 outside the shaft seat 21. A circuit board 22 is provided on the shaft seat 21 in the receiving space 20, and a plurality of stator silicon steel sheet groups 41 (including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, and enameled wire windings 413, etc.) of a preset motor 4 are provided on the circuit board 22. Each stator silicon steel sheet group 41 is respectively arranged in an I-shaped ring outside the shaft sleeve portion 211 of the shaft seat 21, and an air flow duct 40 is formed between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412, the enameled wire windings 413 of each stator silicon steel sheet group 41 in the I-shape and the shaft seat 21 (please refer to Figure 5 shown: coating, there is an air flow duct 40), and a leakage space 140 is formed between each stator silicon steel sheet group 41 of the preset motor 4 and the adjacent rotor magnet 14.

[0039] Moreover, each stator silicon steel sheet group 41 of the preset motor 4, including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, and enameled wire windings 413 wound on the plurality of inner silicon steel sheets 411 and the plurality of outer silicon steel sheets 412, can perform coating or potting operations with different grades of air isolation, dust prevention, and waterproofing on each stator silicon steel sheet group 41 and the circuit board 22, so as to form a protective layer 42 to isolate the entry of air and water, etc., and achieve the purposes of dust prevention, waterproofing, etc. (please refer to Figure 5 , Figure 7 , Figure 13 shown). Because the protective layer of the coating method is relatively thin, the air flow duct 40 and the air flow channel 410 can be retained. And for the potting method, as shown in Figure 8 , Figure 9 , Figure 14 , the air flow duct 40 and the air flow channel 410 are filled with potting material, leaving only the inner space 110 above the stator. And the interior of the fan frame 2 is provided with a receiving space 20 for assembling the fan wheel 1. That is, a shaft sleeve portion 211 for assembling a preset rotating shaft 3 protrudes on the shaft seat 21 inside the receiving space 20 of the fan frame 2. Then, the shaft seat disc 23 of the shaft seat 21 is formed into a closed (non-opening) state, leaving only the gap between the hub 11 of the fan wheel 1 and the shaft seat disc 23 or the circuit board 22 at the bottom of the fan frame 2, that is, the air outlet 142 of the inner space of the hub, so as to achieve the purpose of isolating the air in the external space from entering the inner space 110, and avoid the dirty air with dust, salt, etc. in the external space from entering the inner space 110, causing the accumulation of dust, salt and other foreign matters in the air gap between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or the gap between the bearing 31 and the rotating shaft 3, and making the fan fail and stop running.

[0040] Then, in the above-mentioned fan wheel 1 of the present invention, one or more air ducts 130 for guiding air flow are formed in the space between the outer circumferential surfaces 1334 of the flow guiding ribs inside the inner space 110 of the hub 11 and the inner circumferential surface 1341 of the flow guiding ring. The wide space on one side of the air duct 130 forms an air inlet groove 131, guiding the air inside the inner space 110 (if the coating method is used, the air inside includes the air in the space between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412 and the enameled wire winding 413 in the preset motor 4; if the potting method is used, the air inside will only be the air in the space inside the inner space 110 that has not been potted) to enter the air inlet groove 131 and be squeezed towards the air flow turning surface 132 in the narrow space on the other side of the air duct 130, flow, turn and be discharged outwards through the escape space 140 between the rotor magnet 14 and the outer silicon steel sheet 412, so that a positive pressure is formed at the gap between the bottom of the inner space in the hub 11 and the shaft seat 21, that is, at the air outlet 142 of the inner space of the hub (the only air outlet), relative to the external space, preventing the dirty air with dust, salt, etc. in the external space from entering the inner space 110, resulting in the accumulation of foreign matters such as dust and salt in the air gap (i.e., the escape space 140) between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan preset motor 4 or in the gap between the bearing 31 and the preset rotating shaft 3, causing the fan to stop running (coating and potting are to provide a protective layer 42 for isolating air and preventing dust and water on each stator silicon steel sheet group 41 and the circuit board 22, so as to isolate the entry of air and water, etc., and can achieve the purposes of preventing dust and water, etc. Even without coating or potting, the use of the flow guiding part can prevent the dirty air with dust, salt, etc. from entering the inner space 110, thus prolonging the service life of the fan).

[0041] Please refer to Figure 5 、 Figure 7 、 Figure 13As shown in the figure, since the coating layer is relatively thin, the air flow duct 40 and the air flow channel 410 can be retained. It is assumed that there is an air flow channel 220 in the middle of the circuit board 22 or between the circuit board 22 and the shaft seat 21. An accommodating space 20 is provided inside the fan frame 2 for assembling the fan wheel 1. That is, a shaft sleeve portion 211 protrudes from the shaft seat 21 inside the accommodating space 20, and a preset rotating shaft 3 can be assembled at the shaft sleeve portion 211. A circuit board 22 is provided on the shaft seat 21 in the accommodating space 20, and a plurality of stator silicon steel sheet groups 41 (including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, and an enameled wire winding 413, etc.) of a preset motor 4 are provided on the circuit board 22. Coating or potting operations for isolating air, dust, and water can be performed on each stator silicon steel sheet group 41 and the circuit board 22 to form a protective layer 42 to isolate the entry of air and water, etc., so as to achieve the purposes of dust prevention, water prevention, etc. Then, each stator silicon steel sheet group 41 is respectively arranged in an I-shaped ring outside the shaft seat 21, and an air flow duct 40 is formed between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412, the enameled wire winding 413 of each stator silicon steel sheet group 41 in the I-shape and the shaft seat 21. An air flow channel 220 is formed in the middle of the circuit board 22 or between the circuit board 22 and the shaft seat 21, and a leakage space 140 is formed between each stator silicon steel sheet group 41 of the preset motor 4 and the adjacent rotor magnet 14.

[0042] Then, in the fan wheel 1 of the present invention described above, in the space between the outer circumferential surface 1334 of each flow guiding rib and the inner circumferential surface 1341 of the flow guiding ring in the inner space 110 of the hub 11, one or more air ducts 130 for guiding the air flow to enter are formed. The wide space on one side of the air duct 130 forms an air inlet groove 131. The air inside the inner space 110 is guided into the air inlet groove 131 and is squeezed to flow toward the air flow turning surface 132 in the narrow space on the other side of the air duct 130, and then is discharged outwards through the leakage space 140 between the rotor magnet 14 and the outer silicon steel sheet 412. This makes the inner space form a positive pressure at the gap between the bottom of the hub 11 and the shaft seat 21, that is, at the air outlet 142 of the inner space of the hub (the only air outlet), relative to the external space, thereby preventing the dirty air with dust, salt, etc. in the external space from entering the inner space 110, and preventing dust, salt, etc. from accumulating in the air gap (i.e., the leakage space 140) between the stator silicon steel sheet group 41 and the rotor magnet 14 of the preset motor 4 of the fan or in the gap between the bearing 31 and the preset rotating shaft 3, which may cause the fan to stop running.

[0043] Also, please refer to Figure 8 、 Figure 9 、 Figure 14As shown in the figure, due to potting, the air flow duct 40 and the air flow passage 410 are filled, and only the internal space 110 above the stator remains. Then, for the impeller 1 of the present invention, the internal space 110 of the hub 11 is aligned with the bottom of the accommodating space 20 outside the shaft seat 21. A circuit board 22 is provided on the shaft seat 21 in the accommodating space 20, and a plurality of stator silicon steel sheet groups 41 (including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, an enameled wire winding 413, etc.) of the preset motor 4 are provided on the circuit board 22. Potting operations for isolating air, dust, and water can be performed on each stator silicon steel sheet group 41 and the circuit board 22 to form a protective layer 42 to isolate the entry of air, water, etc., thereby achieving the purposes of dust prevention, waterproofing, etc. Each stator silicon steel sheet group 41 is respectively arranged in an I-shaped ring outside the shaft seat 21. An air flow duct 40 is formed between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412, and the enameled wire winding 413 of each stator silicon steel sheet group 41 in the shape of an I. An air flow passage 220 is formed between the circuit board 22 and the shaft seat 21. A rotor magnet 14 is provided on the wall surface 111 of the internal space 110 of the hub 11. An overflow space 140 is formed between the rotor magnet 14 and the plurality of outer silicon steel sheets 412 for air to pass through and be discharged outward. That is, by the rotation of the guiding part, the remaining air in the internal space 110 is squeezed to turn downward along the air flow turning surface 132 and then discharged outward along the overflow space 140, forming a positive pressure outside the internal space 110, so as to achieve the purpose of isolating the entry of air in the external space into the internal space 110, avoiding the entry of dirty air with dust, salt, etc. in the external space into the internal space 110, resulting in the accumulation of foreign matters such as dust and salt in the air gap between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or the gap between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop running. Then, a U-shaped bearing 31 is installed inside the shaft seat 21 of the fan frame 2. A circuit board 22 is sleeved outside the shaft sleeve part 211 of the shaft seat 21, and a shaft seat cover 216 is further covered at the bottom, so that the circuit board 22 can be electrically connected to each stator silicon steel sheet group 41 of the preset motor 4.

[0044] And the above-mentioned fan wheel 1 of the present invention is provided with a plurality of fan blades 12 around the hub 11 and its outer surface. An inner space 110 is provided inside the hub 11. A rotor magnet 14 is provided at the wall surface 111 of the inner space 110 and a preset rotating shaft 3 can be inserted therethrough. A guiding portion 13 is provided on the top surface of the inner space 110 and surrounds the outside of the preset rotating shaft 3. The guiding portion 13 is composed of one or more guiding ribs 133 and a guiding ring 134. And a rotor magnet 14 is provided on the wall surface below the guiding ring 134 of the inner space 110 of the hub 11. The inner circumferential surface 1341 of the guiding ring is flush and connected with the inner circumferential surface 141 of the rotor magnet, so as to facilitate the smooth flow of air through the overflow space 140, and form one or more spaces from wide to narrow between each of the guiding ribs 133 of the guiding portion 13 and the guiding ring 134 of the guiding portion to form an air duct 130. In order to achieve a better air flow blocking effect, the guiding rib 133 extends from the outside of the rotating shaft pivot seat 1332 along a parabolic path to the inner circumferential surface 1341 of the guiding ring and is connected in an approximate tangent manner to form one or more such air ducts 130. An air inlet groove 131 for guiding the external air to enter is formed in the wide space on one side of the air duct 130, and an air flow turning surface 132 for guiding the air flow and squeezing it downward and outward to discharge is formed in the narrow space on the other side of the air duct 130. An overflow space 140 is formed between the inner circumferential surface 1341 of the guiding ring and the outer silicon steel sheet 412, that is, by the rotation of the guiding portion, the air in the inner space 110 is squeezed to turn downward through the air flow turning surface 132 and then discharged outward along the overflow space 140 to form a positive pressure outside the inner space 110, so as to achieve the purpose of isolating the air in the external space from entering the inner space 110, and avoid the dirty air with dust, salt, etc. in the external space from entering the inner space 110, resulting in the accumulation of foreign matters such as dust and salt in the air gap between the stator silicon steel sheet group 41 of the fan motor 4 and the rotor magnet 14 or the gap between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop operating. Then, a U-shaped bearing 31 is installed inside the shaft seat 21 of the fan frame 2, and a circuit board 22 is sleeved outside the bushing portion 211 of the shaft seat 21, and a shaft seat cover body 216 is further covered at the bottom, so that the circuit board 22 can be electrically connected to each stator silicon steel sheet group 41 of the preset motor 4.

[0045] In addition, please refer to Figure 10Schematic plan view of the second embodiment of the fan wheel of the present invention, together with all non-potting finished product embodiment diagrams. The flow guiding portion 13 provided by the fan wheel 1 in the internal space 110 of the hub 11. A rotating shaft pivot seat 1332 is provided at the central position of the internal space 110. Then, a preset rotating shaft 3 can be passed through and positioned at the rotating shaft pivot seat 1332. A plurality of flow guiding ribs 133 in a parabolic shape approaching the flow guiding ring 134 can be provided along the periphery of the rotating shaft pivot seat 1332. The flow guiding ribs 133 extend from the outside of the rotating shaft pivot seat 1332 along a parabolic path to the inner circumferential surface 1341 of the flow guiding ring, and are connected in an approximately tangential manner to form more than one air duct 130 that is narrow at first, then wide, and then narrow again. In the narrow-to-wide space on the side of the air duct 130 close to the rotating shaft pivot seat 1332, an air inlet groove 131 for guiding the air inside the internal space 110 to enter is formed. And at the narrowest space of the wide-to-narrow space on the other side of the air duct 130, an air flow turning surface 132 for guiding the air flow and squeezing it downward and outward is formed. Then, when the preset rotating shaft 3 drives the fan wheel 1 to rotate, the air inside the internal space 110 can be guided to enter along the bottom of the fan frame 2, and then along the air flow passage 220 between the shaft seat 21 and the circuit board 22, and the air ducts 40 between each stator silicon steel sheet group 41 and the shaft seat 21 into the air inlet groove 131 of the air duct 130, and then continue to be squeezed towards the inner circumferential surface 1341 of the flow guiding ring 134 until reaching the air flow turning surface 132, and then turn downward along the air flow turning surface 132 and discharge outward along the escape space 140 to form a positive pressure outside the internal space 110. That is, a shaft sleeve portion 211 for assembling the preset rotating shaft 3 is convexly provided on the shaft seat 21 in the accommodating space 20 of the fan frame 2. Then, the shaft seat disc 23 of the shaft seat 21 is formed to be closed (not open), leaving only the gap between the hub 11 of the fan wheel 1 and the shaft seat disc 23 or the circuit board 22 at the bottom of the fan frame 2, that is, the air outlet 142 of the internal space of the hub, so as to achieve the purpose of isolating the air in the external space from entering the internal space 110, that is, to prevent the dirty air with dust, salt, etc. in the external space from entering the internal space 110, resulting in the accumulation of foreign matters such as dust and salt in the air gap between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or the gap between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop operating.

[0046] Furthermore, the shaft seat 21 inside the above-mentioned fan frame 2 can be designed in different patterns such as U-shaped or C-shaped. An inner shaft sleeve portion 211 protrudes inside the shaft seat 21, and the inner shaft sleeve portion 211 is provided for assembling a preset rotating shaft 3. Then, the bottom of the accommodation space 20 outside the shaft seat 21 is aligned with the inner space 110 of the hub 11, and a U-shaped shaft seat 21 is provided in the accommodation space 20. A circuit board 22 is sleeved outside the inner shaft sleeve portion 211 of the U-shaped shaft seat 21, and a plurality of stator silicon steel sheet groups 41 (including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, an enameled wire winding 413, etc.) of a preset motor 4 are provided on the circuit board 22. Coating or potting operations for isolating air, dust, and water can be performed on each stator silicon steel sheet group 41 and the circuit board 22 to form a protective layer 42, so that even without coating and potting, this patent can still achieve the purpose of isolating air and water from entering. A plurality of air flow channels 220 can be provided on the periphery of the inner shaft sleeve portion 211 of the circuit board 22 near the shaft seat 21, and the plurality of air flow channels 220 can be located at any appropriate position on the circuit board 22. In particular, a plurality of air flow channels 220 are provided at the circuit board 22 below each stator silicon steel sheet group 41, and at each appropriate position below the preset motor 4 on the circuit board 22, etc. A plurality of air flow channels 220 can be provided, and they can also be located at each appropriate position on the circuit board 22 where no electronic components are provided. The positions where the plurality of air flow channels 220 are provided on the circuit board 22 are not limited.

[0047] Also, please refer to Figure 9 As shown, the above-mentioned fan frame 2 is provided with a C-shaped shaft seat 21 in the accommodation space 20. The shaft seat disc 23 of the shaft seat 21 is formed to be closed (not open), leaving only the gap between the hub 11 of the fan wheel 1 and the bottom shaft seat disc 23 or the circuit board 22 of the fan frame 2, that is, the air outlet 142 of the inner space of the hub. Then, a circular circuit board 22 without a middle hole is provided on the outer side of the bottom of the C-shaped shaft seat 21 to obtain a larger area for accommodating electronic components (a circular circuit board 22 with a middle hole can also be provided to obtain a higher bearing height). Also, at each position on the circuit board 22 where no electronic components are provided, a plurality of air flow channels 220 can be appropriately provided, and the circuit board 22 can be electrically connected to each stator silicon steel sheet group 41 of the preset motor 4 on the upper surface of the C-shaped shaft seat 21. A static impeller pressure plate 215 or a shaft seat disc bracket 213 can be provided outside the bottom accommodation space 210 of the shaft seat 21, and a shaft seat cover 216 can be covered below the accommodation space 210 to protect the circuit board 22.

[0048] When the above-mentioned fan of the present invention is actually operating, a preset motor 4 in the internal space 110 of the hub 11 of the fan wheel 1 and the accommodating space 20 of the fan frame 2 operates, so that each stator silicon steel sheet group 41 cooperates with the rotor magnet 14 to drive the preset rotating shaft 3 to drive the hub 11 of the fan wheel 1 and the plurality of fan blades 12 to rotate. When the fan wheel 1 rotates, the air in the air duct 130 is sucked in through the air inlet groove 131, squeezed from the wide space to the narrow space, then turned downward through the air flow turning surface 132 and discharged outward along the overflow space 140 to form a positive pressure outside the internal space 110. Then, it forms a seal (no opening) on the shaft seat disc 23 of the shaft seat 21, leaving only the gap between the hub 11 of the fan wheel 1 and the shaft seat disc 23 at the bottom of the fan frame 2 or the circuit board 22, that is, the air outlet 142 of the internal space of the hub. Then, by driving the rotation of the guiding part, the air in the internal space 110 is discharged outward to form a positive pressure outside the internal space 110, so as to achieve the purpose of isolating the air in the external space from entering the internal space 110, and avoid the dirty air with dust, salt, etc. in the external space from entering the internal space 110, resulting in the accumulation of foreign matters such as dust and salt between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or in the gap between the bearing 31 and the rotating shaft 3, which may cause the fan to fail and stop operating.

[0049] Another heat dissipation structure of the fan wheel can also achieve the same effect as above, such as Figure 14 shown in the side sectional view (potted and without air duct) of the sixth embodiment of the present invention, which includes a fan wheel 1 and a fan frame 2, wherein:

[0050] The fan wheel 1 includes a hub 11 and a plurality of fan blades 12 annularly arranged on its outer surface. The hub 11 is internally provided with an internal space 110. A rotor magnet 14 is provided at the wall surface 111 of the internal space 110, and a rotating shaft bearing seat 112 is provided at the center of the internal space 110. A guiding part 13 is provided on the top surface of the internal space 110 and surrounds the outside of the rotating shaft bearing seat 112. The space between one or more guiding ribs 133 of the guiding part 13 and the guiding ring 134 of the guiding part 13 forms one or more air ducts 130. An air inlet groove 131 for guiding the external air flow to enter is formed on one side of the air duct 130, and an air flow turning surface 132 for guiding the internal air flow and being squeezed and discharged outward is formed on the other side.

[0051] The interior of the fan frame 2 is provided with a receiving space 20 for assembling the fan wheel 1. That is, a shaft seat disk 23 is provided at the center of the shaft seat 21 inside the receiving space 20. A bracket or a static impeller pressure plate 215 or a shaft seat disk bracket 213 and an air outlet 214 are provided around the shaft seat disk 23. A shaft sleeve portion 211 protrudes from the center of the shaft seat disk 23. An accommodating space 210 for assembling the rotating shaft bearing seat 112 of the fan wheel 1 is provided inside the shaft sleeve portion 211. That is, a preset rotating shaft 3 for assembling the preset rotating shaft bearing seat 112 protrudes inside the accommodating space 210 of the shaft sleeve portion 211 of the shaft seat 21.

[0052] A guiding portion 13 is provided on the top surface of the inner space 110 and surrounds the outside of the rotating shaft bearing seat 112. The guiding portion 13 is composed of one or more guiding ribs 133 and a guiding ring 134. On the wall surface below the guiding ring 134 of the inner space 110 of the hub 11, the rotor magnet 14 is provided. The inner circumferential surface 1341 of the guiding ring is tangent and connected to the inner circumferential surface 141 of the rotor magnet, so as to smoothly guide the hot air to flow through the overflow space 140. One or more spaces that are wide at one end and narrow at the other end are formed between each guiding rib 133 of the guiding portion 13 and the guiding ring 134 of the guiding portion 13 to form an air duct 130. That is, the guiding rib 133 extends from the outside of the rotating shaft pivot seat 1332 along a parabolic path to the inner circumferential surface 1341 of the guiding ring and is connected in an approximately tangential manner to form one or more such air ducts 130. An air inlet groove 131 for guiding the internal air to enter is formed in the wide space on one side of the air duct 130, and an air flow turning surface 132 for guiding the air flow and squeezing it downward and outward is formed in the narrow space on the other side of the air duct 130. An overflow space 140 is formed between the inner circumferential surface 141 of the rotor magnet 14 and the outer silicon steel sheet 412 for the hot air extruded to be discharged outward. That is, a shaft sleeve portion 211 for assembling the preset rotating shaft 3 protrudes on the shaft seat 21 inside the receiving space 20 of the fan frame 2. Then, the shaft seat disk 23 of the shaft seat 21 is formed into a closed (non-opening) state, leaving only the gap between the hub 11 of the fan wheel 1 and the bottom shaft seat disk 23 of the fan frame 2 or the circuit board 22, that is, the air outlet 142 of the inner space of the hub. Then, by driving the rotation of the guiding portion, the air inside the inner space 110 is discharged outward and a positive pressure is formed outside the inner space 110 to achieve the purpose of isolating the air in the external space from entering the inner space 110, so as to avoid the dirty air with dust, salt, etc. in the external space from entering the inner space 110 and causing foreign matters such as dust and salt to accumulate in the air gap between the stator silicon steel sheet group 41 of the fan motor 4 and the rotor magnet 14 or in the gap between the bearing 31 and the rotating shaft 3, resulting in the failure of the fan to stop running.

[0053] The inner accommodating space 20 of the fan frame 2 can accommodate the fan wheel 1. That is, a shaft sleeve portion 211 protrudes from the shaft seat 21 inside the accommodating space 20. The center below the shaft sleeve portion 211 of the shaft seat 21 can be used for assembling a preset rotating shaft. A circuit board 22 is provided on the shaft seat 21 in the accommodating space 20, and a plurality of stator silicon steel sheet groups 41 of a preset motor 4 are provided on the circuit board 22 (which includes a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, an enameled wire winding 413, etc. For the purpose of further strengthening rust prevention, dust prevention, waterproofing, etc., a coating or potting operation for isolating air and preventing dust and water can be performed between each stator silicon steel sheet group 41 and the circuit board 22, which can form a protective layer 42 to isolate the entry of air and water, etc., so as to achieve the purpose of dust prevention, waterproofing, etc.). Then, each stator silicon steel sheet group 41 is respectively arranged in an I-shaped ring outside the shaft sleeve portion 211 of the shaft seat 21, and an air flow duct 40 is formed between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412, and the enameled wire winding 413 of each stator silicon steel sheet group 41 in the shape of an I (if the potting process is adopted, there is no air flow duct 40), and an eddy current space 140 is formed between each stator silicon steel sheet group 41 of the preset motor 4 and the adjacent rotor magnet 14.

[0054] Then, in the fan wheel 1 of the present invention described above, one or more air ducts 130 for guiding air flow to enter are formed in the space between the outer circumferential surfaces 1334 of the guiding ribs inside the hub 11 and the inner circumferential surface 1341 of the guiding ring. The wide space on one side of the air duct 130 forms an air inlet groove 131, guiding the air inside the inner space 110 (if the coating method is used, the air inside includes the air between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412, and the enameled wire winding 413 in the preset motor 4; if the potting method is used, the air inside will only be the air in the space inside the inner space 110 that has not been potted) to enter the air inlet groove 131 and be squeezed towards the air flow turning surface 132 in the narrow space on the other side of the air duct 130 to flow and turn, and then be discharged outwards through the eddy current space 140 between the rotor magnet 14 and the outer silicon steel sheet 412, so that a positive pressure is formed at the outlet of the inner space, that is, at the hub inner space air outlet 142 (the only air outlet) between the hub 11 of the fan wheel 1 and the bottom shaft seat disc 23 or the circuit board 22 of the fan frame 2 relative to the external space, thus preventing the dirty air with dust, salt, etc. in the external space from entering the inner space 110, which may cause dust, salt and other foreign matters to accumulate in the air gap between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or in the gap between the bearing 31 and the rotating shaft 3, resulting in the failure of the fan to stop running.

[0055] Please continue to refer to Figure 5 、 Figure 7 、 Figure 13As shown in the figure, and assuming that there is an air flow channel 220 in the middle of the circuit board 22 or between the circuit board 22 and the shaft seat 21, a circuit board 22 is sleeved outside the bushing portion 211 of the shaft seat 21, and a shaft seat cover 216 is further covered at the bottom, so that the circuit board 22 can be electrically connected to each stator silicon steel sheet group 41 of the preset motor 4. And at a place within the air outlet 214 of the fan blade 12 corresponding to the bottom of the shaft seat 21 (that is, the shaft seat wheel disc 23 at the bottom of the shaft seat 21, the corresponding surface of the hub 11), it is formed as a closed (non-opening), only leaving the gap between the hub 11 of the fan wheel 1 and the shaft seat disc 23 or the circuit board 22 at the bottom of the fan frame 2, that is, the air outlet 142 of the internal space of the hub. The guiding portion 13 provided by the fan wheel 1 in the internal space 110 of the hub 11 has a rotating shaft pivot seat 1332 at the central position of the internal space 110. Then, the rotating shaft pivot seat 1332 can be penetrated and positioned by the preset rotating shaft 3. A plurality of guiding ribs 133 extend from the outside of the rotating shaft pivot seat 1332 along a parabolic path to the inner circumferential surface 1341 of the guiding ring, and are connected approximately tangentially to form more than one air duct 130 that is narrow at first, then wide, and then narrow. In the narrow-to-wide space on the side of the air duct 130 close to the rotating shaft pivot seat 1332, an air inlet groove 131 for guiding the air in the internal space 110 to enter is formed. And at the narrowest space of the wide-to-narrow space on the other side of the air duct 130, an air flow turning surface 132 for guiding the air flow and squeezing it downward and outward to be discharged is formed. Then, when the preset rotating shaft 3 drives the fan wheel 1 to rotate, the air in the internal space 110 can be guided to enter along the bottom of the fan frame 2, and then enter the air inlet groove 131 of the air duct 130 along the air flow channel 220 between the shaft seat 21 and the circuit board 22 and the air duct 40 between each stator silicon steel sheet group 41 and the shaft seat 21. Then, it continues to be squeezed towards the inner circumferential surface 1341 of the guiding ring 134 until it reaches the air flow turning surface 132, and then flows downward along the air flow turning surface 132 and flows along the escape space 140, and is discharged outward through the air outlet 142 of the internal space 110 of the hub 11 and forms a positive pressure outside the internal space 110. That is, at a place within the air outlet 214 of the fan blade corresponding to the bottom of the shaft seat 21 (that is, the bottom of the shaft seat 21, the corresponding surface of the hub), it is formed as a closed (non-opening), only leaving the gap between the hub 11 of the fan wheel 1 and the bottom of the fan frame 2. Then, by driving the rotation of the guiding portion, the air in the internal space 110 is discharged outward and forms a positive pressure outside the internal space 110 to achieve the purpose of isolating the air in the external space from entering the internal space 110, so as to avoid the dirty air with dust, salt, etc. in the external space from entering the internal space 110, causing dust, salt and other foreign matters to accumulate in the air gap between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or the gap between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop running.

[0056] Please continue to look Figure 14 As shown in the figure, it is a side sectional view of the sixth embodiment of the present invention, including a fan wheel 1 and a fan frame 2, wherein:

[0057] The fan wheel 1 includes a hub 11 and a plurality of fan blades 12 annularly arranged on its outer surface. An internal space 110 is provided inside the hub 11. A rotor magnet 14 is provided on the wall surface 111 of the internal space 110, and a rotating shaft bearing seat 112 is provided at the center of the internal space 110. A guiding portion 13 surrounding the outside of the rotating shaft bearing seat 112 is provided on the top surface of the internal space 110. Spaces are formed between one or more guiding ribs 133 and a guiding ring 134 of the guiding portion 13 to form one or more air ducts 130. An air intake groove 131 for guiding the internal air flow to enter is formed on one side of the air duct 130, and an air flow turning surface 132 for guiding the internal air flow and being extruded and discharged outward is formed on the other side.

[0058] An accommodating space 20 is provided inside the fan frame 2 for assembling the fan wheel 1. That is, a shaft seat disc 23 is provided at the center of a shaft seat 21 inside the accommodating space 20. A bracket or a static impeller pressing plate 215 or a shaft seat disc bracket 213 and an air outlet 214 are provided on the periphery of the shaft seat disc 23. A shaft sleeve portion 211 protrudes from the center of the shaft seat disc 23. A receiving space 210 for assembling the rotating shaft bearing seat 112 of the fan wheel 1 is provided inside the shaft sleeve portion 211 of the shaft seat 21. That is, a preset rotating shaft 3 for assembling the rotating shaft bearing seat 112 protrudes inside the receiving space 210 of the shaft sleeve portion 211 of the shaft seat 21.

[0059] The top surface of the internal space 110 is provided with a flow guiding portion 13 surrounding the outside of the preset rotating shaft bearing seat 112. The flow guiding portion 13 is composed of more than one flow guiding rib 133 and a flow guiding ring 134. And the wall surface below the flow guiding ring 134 of the internal space 110 of the hub 11 is provided with a rotor magnet 14, and the inner circumferential surface 1341 of the flow guiding ring is flush and connected with the inner circumferential surface 141 of the rotor magnet, so as to facilitate the smooth flow of hot air through the escape space 140, and form more than one space from wide to narrow between each flow guiding rib 133 of the flow guiding portion 13 and the flow guiding ring 134 of the flow guiding portion 13 to form an air duct 130. That is, the flow guiding rib 133 extends from the outside of the rotating shaft pivot seat 1332 to the inner circumferential surface 1341 of the flow guiding ring in a parabolic path and is connected in an approximate tangent to form more than one such air duct 130. An air inlet groove 131 for guiding external air to enter is formed in the wide space on one side of the air duct 130, and an air flow turning surface 132 for guiding the air flow and being squeezed downward and outward to discharge is formed in the narrow space on the other side of the air duct 130. An escape space 140 is formed between the inner circumferential surface 141 of the rotor magnet 14 and the outer silicon steel sheet 412 for the hot air squeezed out to be discharged outward. That is, a closed (non-opening) is formed at the bottom of the shaft seat 21 corresponding to the air outlet 214 of the fan blade (i.e., the bottom of the shaft seat 21, the corresponding surface of the hub), leaving only the hub 11 of the fan wheel 1 and the shaft seat disc 23 at the bottom of the fan frame 2 to form a closed (non-opening), leaving only the gap between the hub 11 of the fan wheel 1 and the shaft seat disc 23 or the circuit board 22 at the bottom of the fan frame 2, that is, the air outlet 142 of the hub internal space. Then, by driving the rotation of the flow guiding portion, the air in the internal space 110 is discharged outward from the air outlet 142 of the hub internal space and forms a positive pressure outside the internal space 110 to achieve the purpose of isolating the air in the external space from entering the internal space 110, so as to avoid the dirty air with dust, salt, etc. in the external space from entering the internal space 110, resulting in the accumulation of foreign matters such as dust and salt between the stator silicon steel sheet group 41 and the rotor magnet 14 of the fan motor 4 or between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop running.

[0060] The shaft seat 21 inside the above-mentioned fan frame 2 can be designed in different patterns such as U-shaped or C-shaped. An inner shaft sleeve portion 211 protrudes inside the shaft seat 21. The inner shaft sleeve portion 211 can be used for assembling a preset rotating shaft 3. Then, the bottom of the accommodating space 20 outside the shaft seat 21 is aligned with the inner space 110 of the hub 11. A U-shaped shaft seat 21 is provided in the accommodating space 20. A circuit board 22 is sleeved outside the inner shaft sleeve portion 211 of the U-shaped shaft seat 21. A plurality of stator silicon steel sheet groups 41 (including a plurality of inner silicon steel sheets 411, a plurality of outer silicon steel sheets 412, an enameled wire winding 413, etc.) of a preset motor 4 are provided on the circuit board 22. Coating or potting operations for isolating air, dust-proofing, and waterproofing can be performed on each stator silicon steel sheet group 41 and the circuit board 22 to form a protective layer 42 to isolate the entry of air, water, etc., thereby further enhancing the dust-proof and waterproof effects. A plurality of air flow channels 220 can be provided on the periphery of the inner shaft sleeve portion 211 of the circuit board 22 near the shaft seat 21. The plurality of air flow channels 220 can be located at any appropriate position on the circuit board 22, especially at the position of the circuit board 22 below the stator silicon steel sheet group 41. The plurality of air flow channels 220 can also be provided at each appropriate position on the circuit board 22 where no electronic components are provided. The position where the plurality of air flow channels 220 are provided on the circuit board 22 is not limited.

[0061] Also, please see Figure 14 As shown, the plurality of air flow channels 220 can also be appropriately provided at each position on the circuit board 22 where no electronic components are provided, so that the circuit board 22 can be electrically connected to each stator silicon steel sheet group 41 of the preset motor 4 on the C-shaped shaft seat 21. A static impeller pressure plate 215 or a shaft seat disc bracket 213 can be provided outside the bottom accommodating space 210 of the shaft seat 21, and a bottom frame can be provided below the accommodating space 210 to protect the circuit board 22.

[0062] When the fan of the present invention operates in practice, in the space between the outer circumferential surfaces 1334 of the flow guiding ribs inside the hub 11 of the impeller 1 of the present invention and the inner circumferential surface 1341 of the flow guiding ring, one or more air ducts 130 for guiding the airflow to enter are formed. The wide space on one side of the air duct 130 forms an air inlet groove 131, guiding the air inside the inner space 110 (if the coating method is used, the air inside includes the air between the plurality of inner silicon steel sheets 411, the plurality of outer silicon steel sheets 412 and the enameled wire winding 413 in the preset motor 4; if the potting method is used, the air inside will only be the air in the space inside the inner space 110 that has not been potted) to enter the air inlet groove 131 and be squeezed towards the airflow turning surface 132 in the narrow space on the other side of the air duct 130. The airflow turns and passes through the escape space 140 between the rotor magnet 14 and the outer silicon steel sheet 412, and is discharged outwards through the air outlet 142 of the inner space of the hub, and forms a positive pressure outside the inner space 110 to achieve the purpose of isolating the air in the external space from entering the inner space 110, so as to prevent the dirty air with dust, salt, etc. in the external space from entering the inner space 110, causing foreign matters such as dust and salt to accumulate in the air gap between the stator silicon steel sheet group 41 of the fan motor 4 and the rotor magnet 14 or in the gap between the bearing 31 and the rotating shaft 3, and causing the fan to fail and stop operating.

[0063] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Therefore, all simple modifications and equivalent structural changes made by using the content of the specification and drawings of the present invention should be included in the patent scope of the present invention by the same token.

Claims

1. A foreign object prevention device for a fan, comprising a fan wheel and a fan frame, characterized in that: The fan frame includes a hub and a plurality of fan blades annularly arranged on its outer surface. An internal space for passing a preset rotating shaft is provided inside the hub. A guiding portion surrounding the outside of the preset rotating shaft is provided on the top surface of the internal space. One or more air ducts are formed in the space between each one or more guiding ribs and the guiding ring of the guiding portion. One side of the air duct is an air inlet groove for guiding the air in the internal space to enter, and the other side forms an air flow turning surface that can squeeze and guide the air flow and then turn it outward to discharge hot air, so that a positive pressure is formed at the air outlet of the internal space relative to the external space to prevent the dirty air in the external space from entering the internal space of the hub. The fan frame includes a receiving space for assembling the fan wheel, a shaft seat, a shaft seat disc, a shaft seat bracket and a fan air outlet. The receiving space inside the shaft seat of the fan frame is for assembling the fan wheel. A shaft sleeve portion is protruded on the shaft seat disc inside the receiving space of the shaft seat for assembling the preset rotating shaft. Then the shaft seat disc inside the shaft seat is closed. After the fan wheel is assembled into the receiving space of the fan frame, only the gap between the hub of the fan blade and the shaft seat disc of the fan frame or the gap between the hub and the circuit board on the shaft seat disc is left, so that when the fan rotates, a positive pressure is formed at the air outlet of the space inside the hub relative to the external space to prevent the dirty air in the external space from entering the internal space of the hub and causing the fan to stop operating.

2. The foreign object prevention device of the fan according to claim 1, characterized in that: The guiding portion is provided with the guiding ring and the plurality of guiding ribs surrounding the outside of the preset rotating shaft. A rotor magnet is provided on the wall surface below the guiding ring in the internal space of the hub. One or more air ducts are formed in the space between the guiding ribs of the guiding portion and the guiding ring of each guiding portion, extending from the outside of the rotating shaft pivot seat to the inner circumferential surface of each guiding ring in a width-varying manner from wide to narrow. The wide space on one side of the air duct forms the air inlet groove for guiding the internal air flow to enter, and the narrow space on the other side of the air duct forms the air flow turning surface for guiding the air flow and squeezing it downward and outward, so that when the fan rotates, a positive pressure is formed at the air outlet of the internal space of the hub relative to the external space to prevent the dirty air in the external space from entering the internal space of the hub.

3. The foreign object prevention device of the fan according to claim 1, characterized in that: The guiding portion is provided with the guiding ring and the plurality of guiding ribs surrounding the outside of the preset rotating shaft. A rotor magnet is provided on the wall surface below the guiding ring in the internal space of the hub. The inner circumferential surface of the guiding ring is flush with the inner circumferential surface of the rotor magnet and forms an escape space for the smooth flow of hot air between the outer side silicon steel sheet. One or more spaces that are narrow, then wide and then narrow are formed between each guiding rib of the guiding portion and the adjacent guiding rib connecting the adjacent guiding rings. The guiding ribs extend from the outside of the rotating shaft pivot seat to the inner circumferential surface of the guiding ring in a parabolic path and are connected in an approximately tangential manner to form one or more air ducts. The narrow-to-wide space on the side of the air duct close to the rotating shaft pivot seat forms the air inlet groove for guiding the external air flow to enter, and the narrowest space in the wide-to-narrow space on the other side of the air duct forms the air flow turning surface for guiding the air flow and squeezing it downward and outward to generate a positive pressure at the air outlet of the internal space of the hub relative to the external space.

4. The foreign object prevention device of the fan according to claim 1, characterized in that: Outside the bushing portion of the shaft seat inside the fan frame, there is a circuit board for electrically connecting each stator silicon steel sheet group of a preset motor, and an air flow channel for air flow to pass through is formed on the circuit board. The air flow channel is provided on the circuit board and is located between the circuit board and the bushing portion of the shaft seat.

5. The foreign object prevention device of the fan according to claim 4, characterized in that: Each stator silicon steel sheet group includes a plurality of inner silicon steel sheets, a plurality of outer silicon steel sheets, and an enameled wire winding wound around the plurality of inner silicon steel sheets and the plurality of outer silicon steel sheets. A protective layer for isolating air and dust-proof and waterproof coating or potting operations is provided between each stator silicon steel sheet group and the circuit board.

6. A foreign object prevention device for a fan, comprising a fan wheel and a fan frame, characterized in that: The fan wheel includes a hub and a plurality of fan blades annularly arranged on its outer surface. An internal space for a preset rotating shaft bearing seat is provided inside the hub. A guiding portion surrounding the outside of the preset rotating shaft bearing seat is provided on the top surface of the internal space. One or more air ducts are formed in the space between one or more guiding ribs and the guiding ring of the guiding portion. An air intake groove for guiding the external air flow to enter is formed on one side of the air duct, and an air flow turning surface for guiding the external air flow and being squeezed outwards is formed on the other side; and The fan frame includes an accommodation space for assembling the fan wheel, a shaft seat, a shaft seat disc, a shaft seat bracket, and an air outlet. A bushing portion is provided on the shaft seat disc inside the shaft seat. An accommodation space for assembling the rotating shaft bearing seat of the fan wheel is provided inside the bushing portion. A rotating shaft for assembling the preset rotating shaft bearing seat is convexly provided inside the accommodation space of the bushing portion of the shaft seat. Then, the shaft seat disc inside the shaft seat is closed. After the fan wheel is assembled into the accommodation space of the fan frame, only the gap between the fan blade hub and the shaft seat disc of the fan frame or between the hub and the circuit board on the shaft seat disc is left, so that when the fan rotates, a positive pressure is formed at the air outlet of the internal space of the hub relative to the external space to prevent the dirty air in the external space from entering the internal space of the hub and causing the fan to stop running.

7. The foreign object prevention device of the fan according to claim 6, characterized in that: The guiding portion is provided with the guiding ring and the plurality of guiding ribs surrounding the outside of the preset rotating shaft bearing seat. A rotor magnet is provided on the wall surface below the guiding ring in the internal space of the hub. An air duct is formed in the space between the guiding ribs and the guiding ring of each guiding portion, extending from the outside of the rotating shaft pivot seat to the inner circumferential surface of each guiding ring in a width-varying manner from wide to narrow. An air intake groove for guiding the external air flow to enter is formed in the wide space on one side of the air duct, and the air flow turning surface for guiding the air flow and being squeezed downwards and outwards is formed in the narrow space on the other side of the air duct, so that when the fan rotates, a positive pressure is formed at the air outlet of the internal space of the hub relative to the external space to prevent the dirty air in the external space from entering the internal space of the hub.

8. The foreign object prevention device of the fan according to claim 6, characterized in that: The flow guide portion is provided with the flow guide ring and the plurality of flow guide ribs surrounding the outside of the preset rotating shaft bearing seat, and a rotor magnet is provided on the wall surface below the flow guide ring in the inner space of the hub. The inner circumferential surface of the flow guide ring is flush with the inner circumferential surface of the rotor magnet and forms an escape space for the smooth flow of hot air between the outer silicon steel sheets. One or more spaces that narrow, then widen, and then narrow again are formed between each of the flow guide ribs of the flow guide portion and the adjacent flow guide ribs connecting the adjacent flow guide rings. The flow guide ribs extend from the outside of the rotating shaft pivot seat along a parabolic path to the inner circumferential surface of the flow guide ring and are connected in an approximate tangent to form one or more air ducts. An air intake groove for guiding the internal air flow to enter is formed in the narrow-to-wide space on the side of the air duct close to the rotating shaft pivot seat, and at the narrowest space of the wide-to-narrow space on the other side of the air duct, the air flow is guided and squeezed downward and outward to form an air flow turning curved surface for generating a positive pressure at the air outlet of the inner space of the hub relative to the outer space when the fan rotates.

9. The foreign object prevention device of the fan according to claim 6, characterized in that: A circuit board for electrically connecting each stator silicon steel sheet group of a preset motor is provided outside the bushing portion of the shaft seat inside the fan frame, and an air flow channel for the air flow to pass through is formed on the circuit board. The air flow channel is provided on the circuit board and is located between the circuit board and the bushing portion of the shaft seat.

10. The foreign object prevention device of the fan according to claim 8 or 9, characterized in that: Each stator silicon steel sheet group includes a plurality of inner silicon steel sheets, a plurality of outer silicon steel sheets, and an enameled wire winding wound between the plurality of inner silicon steel sheets and the plurality of outer silicon steel sheets. An air flow duct is formed between the plurality of inner silicon steel sheets, the plurality of outer silicon steel sheets, and the enameled wire winding of each stator silicon steel sheet group. An escape space is formed between the rotor magnet and the plurality of outer silicon steel sheets. A protective layer for insulating air and dust-proof and waterproof coating or potting operations is provided between each stator silicon steel sheet group and the circuit board.

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