US20160146216A1 - Centrifugal fan - Google Patents
Centrifugal fan Download PDFInfo
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- US20160146216A1 US20160146216A1 US14/734,654 US201514734654A US2016146216A1 US 20160146216 A1 US20160146216 A1 US 20160146216A1 US 201514734654 A US201514734654 A US 201514734654A US 2016146216 A1 US2016146216 A1 US 2016146216A1
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- Prior art keywords
- air
- centrifugal fan
- impeller
- deflectors
- disposed
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
- F04D29/4226—Fan casings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
- F04D29/444—Bladed diffusers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/681—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps
- F04D29/684—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for elastic fluid pumps by fluid injection
Definitions
- the invention is relative to a centrifugal fan, especially relative to a centrifugal fan for increasing the input air and with stable output air.
- FIG. 1 is a top view of a prior art centrifugal fan 1 .
- the centrifugal fan 1 includes an air outlet O 1 and an air inlet (not shown).
- a sidewall 11 is disposed besides a flow channel P 1 of the centrifugal fan 1 .
- the input air is limited to the size and the position of the air inlet. The input air is difficult to increase. Additionally, the centrifugal fan 1 has a non-uniform problem that the output air is collected at the strong wind area H.
- FIG. 2 is a top view of an additional prior art centrifugal fan 2 .
- the centrifugal fan 2 includes a base plate 21 , a sidewall 22 and an air inputting structure 23 .
- the air inputting structure 23 includes an air inlet 231 and air deflectors 232 .
- the air inlet 231 is disposed on the sidewall 22 .
- the air deflectors 232 are disposed adjacent to the air inlet 231 .
- the air deflectors are extended towards the flow channel P 2 .
- the air inlet 231 Although the purpose of the air inlet 231 is for increasing the input air, the air deflectors 232 occupied some space of the original flow channel P 2 and the space of flow channel P 2 is limited accordingly. In the real implement, the structure in FIG. 2 can not increase the input air. Additionally, the above structure in FIG. 2 makes the inner air pressure of the centrifugal fan 2 unstable, the fan characters getting worse, and noisy. Moreover, the dust inside of the centrifugal fan or the dust outside of the centrifugal fan that is inputted into the air inputting structure 23 are easily to accumulated at the guiding part 2321 of the air deflectors 232 . Thus drags around the air inlet 231 increase, and the outside air difficultly flows into the centrifugal fan 2 via the air inlet 231 .
- an objective of the present invention is to provide a centrifugal fan with an increasing input air and a stable/uniform output air in the unchanged volume of the fan.
- the present invention discloses a centrifugal fan including a fan frame, an impeller, and a motor.
- the fan frame includes a base plate, a sidewall and a plurality of air deflectors.
- the sidewall and the air deflectors are disposed on the base plate.
- An accommodating space and an air outlet disposed by the base plate, the sidewall and the air deflector.
- the impeller is received in the accommodating space.
- a flow channel is disposed between the impeller and the sidewall of the fan frame.
- a motor is connected with the impeller and drives the impeller to rotate.
- the air deflectors are set separately along the extension direction of the flow channel and toward to the air outlet.
- a distance is disposed between the air deflector and the impeller. The distance increases when the air deflector is closer to the air outlet.
- the two adjacent air deflectors are partially overlapped along a predetermined direction.
- the impeller includes a rotation center
- an air deflector includes an end adjacent to an additional air deflector
- the predetermined direction is a direction from the rotation center to the end of the air deflector
- the air deflectors at least include a first air deflector and a second air deflector.
- a distance between the second air deflector and the air outlet is smaller than a distance between the first air deflector and the air outlet.
- the second air deflector and the impeller are separately disposed two opposite sides of the air deflector.
- a gap is disposed between the two adjacent air deflectors, an outside airflow flows into the centrifugal fan via the gap, and the flow direction of the outside airflow is along an extension direction of the flow channel.
- the sidewall comprising a throat part, the air deflectors and the throat part are disposed at two opposite sides of the impeller.
- the air deflectors are arc-shaped.
- dusts in the centrifugal fan are exhausted from the centrifugal fan via a space between the two adjacent air deflectors when the impeller is driven to rotate reversely by the motor.
- the centrifugal fan of the present invention can increase the input air by that air deflectors set separately and along the extension direction along the flow channel and towards to the air outlet and the outside airflow can flow in the fan via the space between the two adjacent air deflectors. Additionally, the airflow flowing into the fan can be flowing along the air deflectors to the air outlet for stable/uniform output air.
- FIG. 1 is a top view of a centrifugal fan of the prior art
- FIG. 2 is top view of an additional centrifugal fan of the prior art
- FIG. 3A is an exploded view of a centrifugal fan according to a preferred embodiment of the present invention.
- FIG. 3B is a top view of the centrifugal fan in FIG. 3A ;
- FIG. 3C is a schematic diagram when the centrifugal fan reversely rotates.
- FIG. 4 is a schematic diagram of different types of air deflector of the present invention.
- FIG. 3A is an exploded view of a centrifugal fan according to a preferred embodiment of the present invention and FIG. 3B is a top view of the centrifugal fan in FIG. 3A .
- FIG. 3B does not show the top plate 314 in FIG. 3A .
- the centrifugal fan 3 of this embodiment includes a fan frame 31 , an impeller 32 and a motor 33 .
- the centrifugal fan 3 can be received in an electronic device as a heat dissipation system.
- the electronic device can be a notebook computer.
- the fan frame includes a base plate 311 , a sidewall 312 and a plurality of air deflectors 313 .
- the centrifugal fan includes three air deflectors.
- the number of the air deflector can depend on real requirements.
- the sidewall 312 and the air deflectors 313 are disposed on the base plate 311 .
- An accommodating space S and an air outlet O 2 is disposed by the base plate 311 , the sidewall 312 and the air deflectors 313 .
- the impeller 32 includes a wheel 321 and a plurality of fan blades 322 .
- the impeller is received in the accommodating space S and mounted on the motor 33 .
- the motor is connected with the impeller 32 and drives the impeller 32 to rotate.
- a flow channel P 3 (as shown in FIG. 3B ) is disposed between the impeller 32 and the sidewall 312 .
- the fan frame 31 further includes a top plate 314 .
- An air inlet O 3 is disposed in the top plate 314 .
- the air deflectors 313 are separately disposed along the extension direction of the flow channel and toward to the air outlet O 2 .
- the sidewall 312 in the embodiment includes a throat part 3121 and a guiding part 3122 .
- the throat part 3121 and the guiding part 3122 are respectively disposed at two ends of the sidewall 312 .
- the air deflectors 313 are separately disposed from the position adjacent to the guiding part 3122 and toward to the air outlet O 2 .
- the air deflectors 313 and the throat part 3121 are disposed on the two sides of the impeller 32 . According to that the air deflectors are separately disposed, a gap D is formed between the two adjacent air deflectors 313 .
- a distance of the gap D optimally is between 0.5 mm to 10 mm.
- outside airflow can flow into the centrifugal fan 3 via the gap D, the air in the centrifugal fan 3 flows along the extension direction of the flow channel P 3 for increasing the input air.
- the outside air that flows into the centrifugal fan 3 can be guided to a low air pressure position by the air deflectors 313 .
- the air deflectors 313 are arc-shaped.
- the outside airflow can be guided to a position near to the middle of the air outlet O 2 for the stable/uniform output air around the air outlet O 2 .
- the shape of the air deflectors can be adjusted according to the real requirements, and it is not limited to shapes of the air deflectors as shown in FIGS. 1 - 5 .
- the air deflectors 313 at least include a first air deflector 3131 and a second air deflector 3132 .
- a distance between the second air deflector 3132 and the air outlet O 2 is smaller than a distance between the first air deflector 3131 and the air outlet O 2 .
- the second air deflector 3132 and the impeller 32 are disposed two opposite sides of the first air deflector 3131 .
- the first air deflector 3131 includes a first end 3131 a and a second end 3131 b.
- the second end 3131 b is disposed adjacent to the second deflector 3132 .
- the second air deflector 3132 includes a third end 3132 a and a fourth end 3132 b.
- the third end 3132 is adjacent to the first air deflector 3131 .
- the third end 3132 a and the impeller 32 are disposed two opposite sides of the second end 3131 b. It means that the second air deflector 3132 is located at outside of the first air deflector 3131 .
- centrifugal fan 3 In centrifugal fan 3 according to the embodiment of the present, the position of the air deflector 313 that is closer to the air outlet O 2 is disposed farther than the position of the air deflector 313 that is father from the air outlet O 2 . Therefore, the air deflectors 313 will not decrease the space of the whole flow channel and prevent to decrease the air inside the centrifugal fan.
- the two adjacent air deflectors 313 are partially overlapped along a predetermined direction.
- the first air deflector 3131 and the second air deflector 3132 are partially overlapped in the predetermined direction d 3 .
- the second end 3131 b of the first air deflector 3131 and the third end of the second air deflector 3132 are overlapped in the predetermined direction d 3 .
- the impeller 32 includes a rotation center C.
- the predetermined direction d 3 is a direction from the rotation center C to the second end 3131 b.
- the gap D is also disposed between the first end 3131 a of the first air deflector 3131 and the guiding part 3122 .
- the gap D is utilized for increasing the input air.
- the distance between the first air deflector 3131 and the impeller 32 is larger than the distance between the sidewall 312 and the impeller 32 . Accordingly the space of the flow channel will not be decreased by the first air deflector 3131 .
- the distance between the sidewall 312 and the impeller 32 , the distance between the first air deflector 3131 and the impeller 32 , and the distance between second air deflector 3132 and the impeller 32 are increasing in turn.
- a width of the flow channel is larger increasingly. There is enough space that the outside airflow can flow via the gap D for increasing the air in the centrifugal fan 3 .
- FIG. 4 is a schematic diagram of different types of air deflector of the present invention. Different from the air deflectors 313 in FIG. 3 , a shape of air deflectors 313 a in FIG. 4 is similar to a rectangle in a top view. Other characters of the centrifugal fan 3 in FIG. 4 are similar to that of the centrifugal fan 3 in FIG. 3 . Please referring the preceding paragraphs and they are not repeated again.
- the air deflectors are disposed separately along the extension direction and toward to the air outlet.
- the outside airflow can flow in the centrifugal fan via the gap between the two adjacent air deflectors.
- the input air is increased.
- the inside airflow can flow along the air deflectors to the air outlet for unifying the output air.
- the flow channel of the centrifugal fan is not reduced according to the air deflectors.
- the centrifugal fan can overcome the problem that the air pressure in the fan is not uniform and noisy. Additionally, the dust in the fan can be exhausted easily, and is not accumulated in the gap.
Abstract
A centrifugal fan includes a fan frame, an impeller and a motor. The fan frame includes a base plate, a sidewall and a plurality of air deflectors. The sidewall and the air deflectors are disposed on the base plate. The base plate, the sidewall and the air deflectors form an accommodating space and an air outlet. The impeller is disposed in the accommodating space. There is a flow channel between the impeller and the sidewall. The motor is connected with the impeller and drives the impeller to rotate. The air deflectors are set separately along the extension direction of the flow channel and toward to the air outlet. The distance between the air deflector which is closer to the air outlet and the impeller is larger.
Description
- This Non-provisional application claims priority to 201410689760.8 filed in People's Republic of China on Nov. 25, 2014, the entire contents of which are hereby incorporated by reference.
- 1. Field of Invention
- The invention is relative to a centrifugal fan, especially relative to a centrifugal fan for increasing the input air and with stable output air.
- 2. Related Art
- In recent years, with advances in technology, the electronic devices (ex: notebook) are gradually developing with high-performance, high speed and high frequency. Accordingly the computing loading of the inside components of the electronic device increases and the temperature of the electronic device is getting higher. If a good heat dissipation solution is not utilized efficiently in the electronic device, the stability will be influenced and the life of the electronic device will be shortened. Thus, generally a fan (ex: centrifugal fan) will be installed inside of the electronic device for heat dissipation.
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FIG. 1 is a top view of a prior artcentrifugal fan 1. As shown inFIG. 1 , thecentrifugal fan 1 includes an air outlet O1 and an air inlet (not shown). Asidewall 11 is disposed besides a flow channel P1 of thecentrifugal fan 1. The input air is limited to the size and the position of the air inlet. The input air is difficult to increase. Additionally, thecentrifugal fan 1 has a non-uniform problem that the output air is collected at the strong wind area H. - For overcoming the above problems, industries provide a centrifugal fan with different structure as shown in
FIG. 2 .FIG. 2 is a top view of an additional prior artcentrifugal fan 2. Thecentrifugal fan 2 includes abase plate 21, a sidewall 22 and anair inputting structure 23. Theair inputting structure 23 includes anair inlet 231 andair deflectors 232. Theair inlet 231 is disposed on the sidewall 22. Theair deflectors 232 are disposed adjacent to theair inlet 231. The air deflectors are extended towards the flow channel P2. Although the purpose of theair inlet 231 is for increasing the input air, theair deflectors 232 occupied some space of the original flow channel P2 and the space of flow channel P2 is limited accordingly. In the real implement, the structure inFIG. 2 can not increase the input air. Additionally, the above structure inFIG. 2 makes the inner air pressure of thecentrifugal fan 2 unstable, the fan characters getting worse, and noisy. Moreover, the dust inside of the centrifugal fan or the dust outside of the centrifugal fan that is inputted into theair inputting structure 23 are easily to accumulated at the guidingpart 2321 of theair deflectors 232. Thus drags around theair inlet 231 increase, and the outside air difficultly flows into thecentrifugal fan 2 via theair inlet 231. - In view of above problems, recently the most electronic devices are developed to have a thinner size. The thinner size of the electronic devices will decrease the inner space of the electronic devices. Accordingly, it is an important subject to provide a centrifugal fan with an increasing input air and a stable/uniform output air in the same fan volume.
- In view of foregoing subject, an objective of the present invention is to provide a centrifugal fan with an increasing input air and a stable/uniform output air in the unchanged volume of the fan.
- For achieving the above objective, the present invention discloses a centrifugal fan including a fan frame, an impeller, and a motor. The fan frame includes a base plate, a sidewall and a plurality of air deflectors. The sidewall and the air deflectors are disposed on the base plate. An accommodating space and an air outlet disposed by the base plate, the sidewall and the air deflector. The impeller is received in the accommodating space. A flow channel is disposed between the impeller and the sidewall of the fan frame. A motor is connected with the impeller and drives the impeller to rotate. The air deflectors are set separately along the extension direction of the flow channel and toward to the air outlet. A distance is disposed between the air deflector and the impeller. The distance increases when the air deflector is closer to the air outlet.
- In one embodiment, the two adjacent air deflectors are partially overlapped along a predetermined direction.
- In one embodiment, the impeller includes a rotation center, an air deflector includes an end adjacent to an additional air deflector, and the predetermined direction is a direction from the rotation center to the end of the air deflector.
- In one embodiment, the air deflectors at least include a first air deflector and a second air deflector. A distance between the second air deflector and the air outlet is smaller than a distance between the first air deflector and the air outlet. The second air deflector and the impeller are separately disposed two opposite sides of the air deflector.
- In one embodiment, a gap is disposed between the two adjacent air deflectors, an outside airflow flows into the centrifugal fan via the gap, and the flow direction of the outside airflow is along an extension direction of the flow channel.
- In one embodiment, the sidewall comprising a throat part, the air deflectors and the throat part are disposed at two opposite sides of the impeller.
- In one embodiment, the air deflectors are arc-shaped.
- In one embodiment, dusts in the centrifugal fan are exhausted from the centrifugal fan via a space between the two adjacent air deflectors when the impeller is driven to rotate reversely by the motor.
- According to above, the centrifugal fan of the present invention can increase the input air by that air deflectors set separately and along the extension direction along the flow channel and towards to the air outlet and the outside airflow can flow in the fan via the space between the two adjacent air deflectors. Additionally, the airflow flowing into the fan can be flowing along the air deflectors to the air outlet for stable/uniform output air.
- The invention will become more fully understood from the detailed description and accompanying drawings, which are given for illustration only, and thus are not limitative of the present invention, and wherein:
-
FIG. 1 is a top view of a centrifugal fan of the prior art; -
FIG. 2 is top view of an additional centrifugal fan of the prior art; -
FIG. 3A is an exploded view of a centrifugal fan according to a preferred embodiment of the present invention; -
FIG. 3B is a top view of the centrifugal fan inFIG. 3A ; -
FIG. 3C is a schematic diagram when the centrifugal fan reversely rotates; and -
FIG. 4 is a schematic diagram of different types of air deflector of the present invention. - The present invention will be apparent from the following detailed description, which proceeds with reference to the accompanying drawings, wherein the same references relate to the same elements.
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FIG. 3A is an exploded view of a centrifugal fan according to a preferred embodiment of the present invention andFIG. 3B is a top view of the centrifugal fan inFIG. 3A . For easily understanding,FIG. 3B does not show thetop plate 314 inFIG. 3A . Referring toFIGS. 3A and 3B , the centrifugal fan 3 of this embodiment includes afan frame 31, animpeller 32 and amotor 33. The centrifugal fan 3 can be received in an electronic device as a heat dissipation system. The electronic device can be a notebook computer. - The fan frame includes a
base plate 311, asidewall 312 and a plurality ofair deflectors 313. In the embodiment, the centrifugal fan includes three air deflectors. However, the number of the air deflector can depend on real requirements. - The
sidewall 312 and theair deflectors 313 are disposed on thebase plate 311. An accommodating space S and an air outlet O2 is disposed by thebase plate 311, thesidewall 312 and theair deflectors 313. - The
impeller 32 includes awheel 321 and a plurality offan blades 322. The impeller is received in the accommodating space S and mounted on themotor 33. The motor is connected with theimpeller 32 and drives theimpeller 32 to rotate. A flow channel P3 (as shown inFIG. 3B ) is disposed between theimpeller 32 and thesidewall 312. In the embodiment, thefan frame 31 further includes atop plate 314. An air inlet O3 is disposed in thetop plate 314. When the impeller is rotating, the outside air flows into the centrifugal fan 3 via the air inlet O3 and the air in the centrifugal fan 3 flows along the flow channel P3 to the air outlet O2. Then the air in the centrifugal fan 3 is exhausted via the air outlet O2. - In the embodiment, the
air deflectors 313 are separately disposed along the extension direction of the flow channel and toward to the air outlet O2. In detail, thesidewall 312 in the embodiment includes athroat part 3121 and a guidingpart 3122. Thethroat part 3121 and the guidingpart 3122 are respectively disposed at two ends of thesidewall 312. Theair deflectors 313 are separately disposed from the position adjacent to the guidingpart 3122 and toward to the air outlet O2. Theair deflectors 313 and thethroat part 3121 are disposed on the two sides of theimpeller 32. According to that the air deflectors are separately disposed, a gap D is formed between the twoadjacent air deflectors 313. In the embodiment, a distance of the gap D optimally is between 0.5 mm to 10 mm. In the embodiment, when the impeller is rotating, outside airflow can flow into the centrifugal fan 3 via the gap D, the air in the centrifugal fan 3 flows along the extension direction of the flow channel P3 for increasing the input air. - In the embodiment, the outside air that flows into the centrifugal fan 3 can be guided to a low air pressure position by the
air deflectors 313. InFIG. 3B , theair deflectors 313 are arc-shaped. The outside airflow can be guided to a position near to the middle of the air outlet O2 for the stable/uniform output air around the air outlet O2. It is noted that the shape of the air deflectors can be adjusted according to the real requirements, and it is not limited to shapes of the air deflectors as shown in FIGS. 1-5. - The following descriptions are relative to the relative positions of the
air deflectors 313. - In the embodiment, the
air deflectors 313 at least include afirst air deflector 3131 and asecond air deflector 3132. A distance between thesecond air deflector 3132 and the air outlet O2 is smaller than a distance between thefirst air deflector 3131 and the air outlet O2. Thesecond air deflector 3132 and theimpeller 32 are disposed two opposite sides of thefirst air deflector 3131. - In detail, the
first air deflector 3131 includes afirst end 3131 a and asecond end 3131 b. Thesecond end 3131 b is disposed adjacent to thesecond deflector 3132. Thesecond air deflector 3132 includes athird end 3132 a and afourth end 3132 b. Thethird end 3132 is adjacent to thefirst air deflector 3131. Thethird end 3132 a and theimpeller 32 are disposed two opposite sides of thesecond end 3131 b. It means that thesecond air deflector 3132 is located at outside of thefirst air deflector 3131. - In centrifugal fan 3 according to the embodiment of the present, the position of the
air deflector 313 that is closer to the air outlet O2 is disposed farther than the position of theair deflector 313 that is father from the air outlet O2. Therefore, theair deflectors 313 will not decrease the space of the whole flow channel and prevent to decrease the air inside the centrifugal fan. - Additionally, in the embodiment, the two
adjacent air deflectors 313 are partially overlapped along a predetermined direction. InFIG. 3B , thefirst air deflector 3131 and thesecond air deflector 3132 are partially overlapped in the predetermined direction d3. In detail, thesecond end 3131 b of thefirst air deflector 3131 and the third end of thesecond air deflector 3132 are overlapped in the predetermined direction d3. Theimpeller 32 includes a rotation center C. The predetermined direction d3 is a direction from the rotation center C to thesecond end 3131b. Thus, when theimpeller 32 rotates forwardly, the air in the centrifugal fan 3 exhausted via the gap D between theair deflector 3131 and thesecond air deflector 3132 can be prevented. - In the embodiment, the gap D is also disposed between the
first end 3131 a of thefirst air deflector 3131 and the guidingpart 3122. The gap D is utilized for increasing the input air. The distance between thefirst air deflector 3131 and theimpeller 32 is larger than the distance between thesidewall 312 and theimpeller 32. Accordingly the space of the flow channel will not be decreased by thefirst air deflector 3131. - The distance between the
sidewall 312 and theimpeller 32, the distance between thefirst air deflector 3131 and theimpeller 32, and the distance betweensecond air deflector 3132 and theimpeller 32 are increasing in turn. A width of the flow channel is larger increasingly. There is enough space that the outside airflow can flow via the gap D for increasing the air in the centrifugal fan 3. - Additionally, in the embodiment, when the motor drives the
impeller 32 to rotate reversely, a reverse airflow is generated in the centrifugal fan 3. Dusts in the centrifugal fan 3 can be exhausted from the centrifugal fan 3 via the gap D between the two adjacent air deflectors to achieve the dust-removing function. A shape of theair deflectors 313 is arc-shaped to match the flow direction of the flow field. The dusts in the centrifugal fan 3 can be flowed along the arc-shaped air deflector and exhausted via the gap D - Referring to
FIG. 4 ,FIG. 4 is a schematic diagram of different types of air deflector of the present invention. Different from theair deflectors 313 inFIG. 3 , a shape ofair deflectors 313 a inFIG. 4 is similar to a rectangle in a top view. Other characters of the centrifugal fan 3 inFIG. 4 are similar to that of the centrifugal fan 3 inFIG. 3 . Please referring the preceding paragraphs and they are not repeated again. - In summary, in the centrifugal fan, the air deflectors are disposed separately along the extension direction and toward to the air outlet. The outside airflow can flow in the centrifugal fan via the gap between the two adjacent air deflectors. Thus, the input air is increased. Additionally, the inside airflow can flow along the air deflectors to the air outlet for unifying the output air.
- Comparing to the prior art, the flow channel of the centrifugal fan is not reduced according to the air deflectors. The centrifugal fan can overcome the problem that the air pressure in the fan is not uniform and noisy. Additionally, the dust in the fan can be exhausted easily, and is not accumulated in the gap.
- Although the invention has been described with reference to specific embodiments, this description is not meant to be construed in a limiting sense. Various modifications of the disclosed embodiments, as well as alternative embodiments, will be apparent to persons skilled in the art. It is, therefore, contemplated that the appended claims will cover all modifications that fall within the true scope of the invention.
Claims (8)
1. A centrifugal fan comprising:
a fan frame comprising a base plate, a sidewall and a plurality of air deflectors, the sidewall and the air deflectors are disposed on the base plate, an accommodating space and an air outlet disposed by the base plate, the sidewall and the air deflector;
an impeller received in the accommodating space, a flow channel disposed between the impeller and the sidewall of the fan frame; and
a motor connected with the impeller and driving the impeller to rotate;
wherein the deflectors are set separately along the extension direction of the flow channel and toward to the air outlet, a distance is disposed between the air deflector and the impeller, and the distance increases when the air deflector is closer to the air outlet.
2. The centrifugal fan of claim 1 , wherein the two adjacent air deflectors are partially overlapped along a predetermined direction.
3. The centrifugal fan of claim 2 , wherein the impeller comprises a rotation center, an air deflector comprises an end adjacent to an additional air deflector, and the predetermined direction is a direction from the rotation center to the end of the air deflector.
4. The centrifugal fan of claim 1 , wherein the air deflectors at least comprises a first air deflector and a second air deflector, a distance between the second air deflector and the air outlet is smaller than a distance between the first air deflector and the air outlet, and the second air deflector and the impeller are separately disposed two opposite sides of the air deflector.
5. The centrifugal fan of claim 1 , wherein a gap is disposed between the adjacent two air deflectors, an outside airflow flows into the centrifugal fan via the gap, and the flow direction of the outside airflow is along an extension direction of the flow channel.
6. The centrifugal fan of claim 1 , wherein the sidewall comprises a throat part, and the air deflectors and the throat part are disposed at two opposite sides of the impeller, respectively.
7. The centrifugal fan of claim 1 , wherein the air deflectors are arc-shaped.
8. The centrifugal fan of claim 1 , wherein dusts in the centrifugal fan are exhausted from the centrifugal fan via a space between the two adjacent air deflectors when the impeller is driven to rotate reversely by the motor.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US16/434,442 US10718342B2 (en) | 2014-11-25 | 2019-06-07 | Centrifugal fan comprising a sidewall and plurality of air deflectors forming a plurality of airflow entry tunnels to sequentially expand a flow channel outwardly in a radial direction |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201410689760.8A CN105697396A (en) | 2014-11-25 | 2014-11-25 | Centrifugal fan |
CN201410689760.8 | 2014-11-25 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US16/434,442 Continuation-In-Part US10718342B2 (en) | 2014-11-25 | 2019-06-07 | Centrifugal fan comprising a sidewall and plurality of air deflectors forming a plurality of airflow entry tunnels to sequentially expand a flow channel outwardly in a radial direction |
Publications (1)
Publication Number | Publication Date |
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US20160146216A1 true US20160146216A1 (en) | 2016-05-26 |
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US14/734,654 Abandoned US20160146216A1 (en) | 2014-11-25 | 2015-06-09 | Centrifugal fan |
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CN (2) | CN105697396A (en) |
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US20180008109A1 (en) * | 2015-01-20 | 2018-01-11 | Eurofilters Holding N.V. | Vacuum Cleaner Robot |
CN108457868A (en) * | 2018-05-25 | 2018-08-28 | 苏州优德通力科技有限公司 | A kind of anhydrous self-priming distinguishes the super-silent intelligent water pump of flow |
JP2019199846A (en) * | 2018-05-17 | 2019-11-21 | リンナイ株式会社 | Centrifugal fan |
US10674883B2 (en) * | 2015-01-20 | 2020-06-09 | Eurofilters Holding N.V. | Vacuum cleaner robot |
US10718342B2 (en) | 2014-11-25 | 2020-07-21 | Delta Electronics, Inc. | Centrifugal fan comprising a sidewall and plurality of air deflectors forming a plurality of airflow entry tunnels to sequentially expand a flow channel outwardly in a radial direction |
US20230213041A1 (en) * | 2021-12-31 | 2023-07-06 | Lenovo (Beijing) Limited | Fan |
US20230301017A1 (en) * | 2020-04-10 | 2023-09-21 | Acer Incorporated | Centrifugal heat dissipation fan and heat dissipation system of electronic device |
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CN110594196A (en) * | 2019-08-26 | 2019-12-20 | 太仓市华盈电子材料有限公司 | Heat radiation fan capable of changing wind direction |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10718342B2 (en) | 2014-11-25 | 2020-07-21 | Delta Electronics, Inc. | Centrifugal fan comprising a sidewall and plurality of air deflectors forming a plurality of airflow entry tunnels to sequentially expand a flow channel outwardly in a radial direction |
US20180008109A1 (en) * | 2015-01-20 | 2018-01-11 | Eurofilters Holding N.V. | Vacuum Cleaner Robot |
US10674883B2 (en) * | 2015-01-20 | 2020-06-09 | Eurofilters Holding N.V. | Vacuum cleaner robot |
US10736478B2 (en) * | 2015-01-20 | 2020-08-11 | Eurofilters Holding N.V. | Vacuum cleaner robot |
JP2019199846A (en) * | 2018-05-17 | 2019-11-21 | リンナイ株式会社 | Centrifugal fan |
JP7050571B2 (en) | 2018-05-17 | 2022-04-08 | リンナイ株式会社 | Centrifugal fan |
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US11968800B2 (en) * | 2020-04-10 | 2024-04-23 | Acer Incorporated | Centrifugal heat dissipation fan and heat dissipation system of electronic device |
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US11892011B2 (en) * | 2021-12-31 | 2024-02-06 | Lenovo (Beijing) Limited | Fan |
Also Published As
Publication number | Publication date |
---|---|
CN105697396A (en) | 2016-06-22 |
CN110017293B (en) | 2021-07-30 |
CN110017293A (en) | 2019-07-16 |
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