EP3736449B1 - Fan and mobile terminal - Google Patents
Fan and mobile terminal Download PDFInfo
- Publication number
- EP3736449B1 EP3736449B1 EP18903083.6A EP18903083A EP3736449B1 EP 3736449 B1 EP3736449 B1 EP 3736449B1 EP 18903083 A EP18903083 A EP 18903083A EP 3736449 B1 EP3736449 B1 EP 3736449B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- groove
- guide ring
- fan
- grooves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001154 acute effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 description 24
- 238000010586 diagram Methods 0.000 description 15
- 238000005452 bending Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- 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
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
Definitions
- This application relates to the field of mobile terminal technologies, and in particular, to a fan and a mobile terminal.
- a fan needs to have relatively low noise.
- a cooling fan needs to have a relatively high air volume and relatively low noise while having a smallest possible size.
- DE 102009 028 125 A1 refers to an ingress geometry of fan wheel.
- GP 754055 refers to a centrifugal fan wheel.
- CN 106151111A refers to a cooling blower.
- this application provides a fan.
- the fan includes a housing, the housing is provided with an air inlet and an air outlet, a centrifugal impeller is disposed inside the housing, and the centrifugal impeller may rotate relative to the housing, to transmit air from the air inlet to the air outlet.
- the centrifugal impeller includes a plurality of blades, and the plurality of blades are disposed around a drive shaft of the centrifugal impeller.
- At least one of the plurality of blades is provided with a plurality of grooves, the plurality of grooves are arranged along a radial direction of the blade, and the grooves are inclined at an angle relative to a normal direction of a radial tangent of the blade.
- the radial direction of the blade is an extending direction of the blade gradually away from the drive shaft.
- movement of an airflow relative to the blade is a combination of velocity along a tangential direction of the blade and velocity relative to a radius of the centrifugal impeller, that is, final relative velocity is not parallel to the normal direction (a direction perpendicular to a direction of the radial tangent of the blade) of the blade. Therefore, to enable air to flow through the grooves more smoothly, the grooves disposed in embodiments of this application are inclined relative to the radial direction, so that a length direction of the grooves is the same as a direction of the relative velocity as much as possible, thereby improving passage of the air through the grooves, further improving a passing effect, and reducing noise caused by the fan.
- the grooves may be formed in different manners, and the manners are separately described below.
- the groove is a first groove inclined in a single direction, and an angle between a length direction of the first groove and the normal direction of the radial tangent of the blade is an acute angle.
- the acute angle may be any angle between 3° and 75°, so that the first groove can better match the relative velocity, thereby improving the passage of the air.
- a plurality of first grooves may be specifically provided on different surfaces of the blade.
- the top surface and the bottom surface each may be provided a first groove, or the top surface or the bottom surface is provided with a first groove.
- the side surfaces of the blade each may also be provided with a first groove.
- a plurality of first grooves are provided on the surfaces of the blade, the plurality of first grooves may be arranged periodically or non-periodically.
- first groove may be of different shapes. Specifically, a cross section of the first groove may be rectangular or triangular, or streamlined and elliptical, or of another shape.
- a height of a single first groove is measured along a height direction of the blade, and ranges between 0.1% and 25% of a total height of the blade.
- a width of the first groove is measured along a radial length direction of the blade, and ranges between 0.1% and 25% of a total length of the blade.
- the groove is a second groove of a herringbone shape.
- the second groove includes a first groove body and a second groove body inclined relative to each other, and the first groove body and the second groove body each form an acute angle with the normal direction of the radial tangent of the blade.
- the acute angle may be any angle between 3° and 75°.
- surfaces on which second grooves are specifically provided and periodicity of arrangement of the second grooves refer to the foregoing description of the first groove.
- an outer end face of the blade is provided with a third groove, further improving a ventilation effect.
- an air intake effect of the fan is further improved by adding a guide ring.
- the drive shaft of the centrifugal impeller is exposed outside the air inlet
- the guide ring is fixedly connected to the plurality of blades
- a surface of the guide ring facing the drive shaft is a guide surface.
- air intake air flowing in from the air inlet is guided by the guide surface of the guide ring, thereby improving an effect of air steering, reducing vortices, improving air circulation, and further improving an air intake effect.
- the guide ring may be used independently, or according to the invention is used in combination with the grooves, thereby further improving the air supply effect.
- the guide ring may be a complete ring, or may be segmented.
- the guide ring includes a plurality of alternately disposed arc segments.
- the guide ring may be specifically disposed inside the housing, or may be exposed outside the air inlet. In a specific implementation solution, the guide ring is exposed outside the air inlet.
- a cross section of the guide ring may be of different shapes.
- the cross section of the guide ring is of different shapes, such as circular, elliptical, or bullet-shaped.
- a fan is provided.
- the fan includes a housing, the housing is provided with an air inlet and an air outlet, a centrifugal impeller is disposed inside the housing, and the centrifugal impeller may rotate relative to the housing, to transmit air from the air inlet to the air outlet.
- the centrifugal impeller includes a plurality of blades, and the plurality of blades are disposed around a drive shaft of the centrifugal impeller.
- a guide ring is further included, the guide ring is fixedly connected to the plurality of blades, and a surface of the guide ring facing the drive shaft is a guide surface.
- air flowing in from the air inlet is guided by the guide surface of the guide ring, thereby improving an effect of air steering, reducing vortices, improving air circulation, and further improving an air intake effect.
- the guide ring may be a complete ring, or may be segmented.
- the guide ring includes a plurality of alternately disposed arc segments.
- the guide ring may be specifically disposed inside the housing, or may be exposed outside the air inlet. In a specific implementation solution, the guide ring is exposed outside the air inlet.
- a cross section of the guide ring may be of different shapes.
- the cross section of the guide ring is of different shapes, such as circular, elliptical, or bullet-shaped.
- this application further provides a mobile terminal.
- the mobile terminal includes a housing and any one of the foregoing fans disposed inside the housing.
- a guide ring is added to the fan, or a groove is added to the fan, or, according to the invention, both a groove and a guide ring are added to the fan, to improve an air supply volume of the fan and reduce noise of the fan.
- an embodiment of this application provides a fan.
- a structure of the fan provided in this embodiment of this application is improved, to increase the air supply volume of the fan.
- the fan provided in this embodiment of this application is a centrifugal fan
- the centrifugal fan includes a housing and a centrifugal impeller disposed inside the housing.
- the centrifugal impeller is rotatably connected to the housing through a drive shaft.
- An axis of the drive shaft is also an axis of the centrifugal impeller.
- the housing is provided with an air inlet and an air outlet. In a specific disposition, there may be one air inlet or two air inlets. When there is one air inlet, the air inlet is located on one side of the centrifugal impeller.
- the fan is a single-side air intake fan. When there are two air inlets, the two air inlets are provided opposite to each other on two sides of the centrifugal impeller. In this case, the fan is a two-side air intake fan.
- FIG. 1 is a schematic structural diagram of a fan
- FIG. 2 is a cross-sectional view of a fan.
- a housing includes a top cover 10 and a bottom cover 20 disposed opposite to each other, and the top cover 10 and the bottom cover 20 are connected by using a side wall.
- An air inlet is provided on the top cover 10, and an air outlet 70 is provided on the side wall.
- air entering from the top cover 10 is transmitted to the air outlet 70 on the side wall through a centrifugal impeller 80, and then enters a mobile terminal.
- a centrifugal impeller 80 a centrifugal impeller 80
- the line with the arrow indicates a flow direction of the air. It can be learned from FIG. 2 that, during air circulation, the flow direction of the air inside the housing is bent at approximately ninety degrees. Due to a relatively small thickness of the top cover 10 at the air inlet, and a relatively small gap between the top cover and an inner wall surface of a system in which the top cover is located, the air has a relatively large bend at an edge of the air inlet, easily causing a vortex, and affecting an air supply volume of the air in the fan. To reduce loss of the air at the air inlet during bending, the centrifugal impeller 80 provided in this embodiment of this application is provided with a guide ring 40. FIG.
- the guide ring 40 is annular, and a center of the guide ring 40 is located on an axis of the centrifugal impeller 80, to ensure that during rotation, the guide ring 40 can synchronously rotate with the centrifugal impeller 80, and can be stationary relative to the centrifugal impeller 80.
- the guide ring 40 divides an area on the centrifugal impeller 80 into two areas: an area I and an area II.
- the area I is an area corresponding to the air inlet.
- the guide ring 40 may further be of another shape, for example, a ring shape enclosed by a plurality of discontinuous arc segments, or a ring shape with a notch, or other different shapes.
- FIG. 1 is a schematic diagram of a cross section of the guide ring 40. It can be learned from a structure shown in FIG. 1 that, the guide ring 40 has a guide surface 41, and the guide surface 41 is an inner side surface of the guide ring 40. In addition, during mounting of the centrifugal impeller 80, the guide surface 41 faces an axis of the centrifugal impeller 80. When the centrifugal impeller 80 rotates, the air flows through the guide surface 41, and is bent along the guide surface 41. To improve a flow effect of the air during bending, the guide surface 41 is an arc-shaped guide surface. An arc of an edge of the guide surface 41 shown in FIG.
- the edge of the guide surface 41 may alternatively not be an arc, or may be non-streamlined.
- the guide ring has two functions. One is to use a streamlined design to reduce air resistance, and the other function is to reduce vortices generated by a fluid flowing through the cover 10. Therefore, the guide surface 41 still has a partial effect even if the guide surface 41 is not streamlined. Therefore, a specific shape of the cross section of the guide ring 40 is not limited herein. FIG.
- the cross section of the guide ring 40 shown in different shapes of the cross section of the guide ring 40. It can be learned from FIG. 4 to FIG. 8 that, the cross section of the guide ring 40 provided in this embodiment may be of different shapes, such as circular, elliptical, bullet-shaped, or runway-shaped. In a specific disposition of the guide ring 40, the cross section of the guide ring 40 may be of different shapes, such as a regular shape, an irregular shape, a symmetrical shape, an asymmetrical shape.
- r1 is a radius of a drive shaft 50
- r2 is an outer diameter of the top cover
- r3 is a radius of a center point of the cross section of the guide ring 40
- r4 is a radius of an air inlet 30
- a is a distance from an upper surface of the guide ring 40 to an upper surface of the top cover 10
- b is a width of the cross section of the guide ring 40
- c is a thickness of the top cover 10
- d is a distance from an outer side surface of the guide ring 40 to an inner side surface of the top cover 10
- h is a height of the guide ring 40.
- the guide ring 40 is located between the drive shaft 50 and the outer diameter of the top cover 10, that is, r1 ⁇ r3 ⁇ r2.
- the guide ring 40 may be located on an inner side of the top cover 10 (located inside the air inlet 30) in the radial direction. In this case, r1 ⁇ r3 ⁇ r4.
- d ⁇ 0.
- d 0, it indicates that an end face of the guide ring 40 away from the drive shaft 50 is in contact with the inner side surface of the top cover 10.
- a structure in which the guide ring 40 is embedded in the top cover 10 may be used.
- r4 ⁇ r3 ⁇ r2, and d ⁇ 0.
- the guide ring 40 is located outside the air inlet 30, and between the top cover 10 and the blade 81.
- a has different values.
- a negative dimension indicates that the upper surface of the guide ring 40 is higher than the upper surface of the top cover 10.
- a positive distance indicates that the upper surface of the guide ring 40 is lower than the upper surface of the top cover 10.
- a dimension of 0 indicates that the guide ring 40 and the top cover 10 are flush.
- a height from the upper surface of the guide ring 40 to the upper surface of the top cover 10 is greater than the thickness of the top cover 10. That is, the height of the guide ring 40 is less than a gap between blade 81 and the top cover 10.
- the guide ring 40 is located at the air inlet 30, that is, the guide surface 41 of the guide ring 40 is closer to the drive shaft 50 than the inner side surface of the top cover 10, so that an effect of air steering at the air inlet 30 can be improved by using the guide surface 41.
- FIG. 10 shows dimensions of the guide ring 40.
- a height h of the guide ring 40 ranges between 0.01 mm and 5 mm.
- a width b of the guide ring 40 ranges between 0.01 mm and 15 mm.
- the guide ring 40 when the guide ring 40 is specifically fixed to the centrifugal impeller 80, the guide ring 40 may be fixed to the blade 81 of the centrifugal impeller 80 in different manners such as bonding, welding, or by using a connection member.
- the guide ring 40 and the centrifugal impeller 80 may alternatively be prepared integrally. Either the foregoing connection or preparation manner may be applied to the fan provided in this embodiment of this application.
- the guide ring 40 provided in this embodiment of this application further has the following effect: Because the guide ring 40 and the blade 81 are relatively fixed, when the centrifugal impeller 80 rotates, relative positions of the impeller 80 and the guide ring 40 are fixed, and during air circulation, the blade 81 and the guide ring 40 on both sides of the air are relatively fixed, facilitating the air circulation.
- the centrifugal impeller rotates and the top cover rotates relative to the blade, and during air circulation, there is relative movement between the blade and the top cover on both sides of the air. Therefore, some disturbances are caused to the flow of the air. It can be learned from the foregoing description that, in the fan provided in this embodiment of this application, the impeller 80 and the guide ring 40 are relatively fixed to each other, so that an effect of air circulation can be further improved, thereby increasing an air supply volume.
- FIG. 11 shows another structure of a fan according to an embodiment of this application.
- an air supply volume is improved by improving a structure of the blade 81 on the centrifugal impeller 80.
- the air supply volume is improved by providing a groove 811 on the impeller 80 along a radial direction of the blade 81.
- the radial direction of the blade 81 is an extending direction of the blade 81 gradually away from the drive shaft.
- a rectangular blade is used for description.
- surfaces of the blade 81 are respectively named.
- five surfaces of the blade 81 are respectively a top surface 812, a bottom surface (a surface opposite to the top surface 812), a left side surface 813, a right side surface (a surface opposite to the left side surface 813), and an outer end face 814.
- the top surface 812 and the bottom surface are two surfaces perpendicular to the axis of the centrifugal impeller 80.
- the left side surface 813, the right side surface, and the outer end face 814 are three side surfaces between the top surface 812 and the bottom surface.
- the outer end face 814 is an end face of the blade 81 away from the axis.
- the left side surface 813 and the right side surface are respectively side surfaces on both sides of the outer end face 814.
- a direction from the axis of the centrifugal impeller 80 to the outer end face 814 of the blade 81 is the radial direction of the blade 81.
- At least one blade 81 is provided with a plurality of grooves 811, the plurality of grooves 811 are arranged along the radial direction of the blade 81, and the grooves 811 are inclined at an angle relative to a normal direction of a radial tangent of the blade 81.
- the groove 811 is inclined relative to the radial direction of the blade 81, both ends of the groove 811 are open, and there is a specified angle between a length direction of the groove 811 and the normal direction of the radial tangent of the blade 81.
- the length direction of the groove 811 is a direction from one opening of the groove 811 to the other opening of the groove 811.
- a direction of the radial tangent of the blade 81 is the radial direction of the blade 81 when the blade 81 is a straight blade, and is a tangent direction of an arc line on the blade 81 when the blade 81 is a curved blade.
- a part of the blade 81 of the fan provided in this embodiment of this application is provided with a first groove 815, the first groove 815 is provided on the top surface 812 of the blade 81.
- the length direction of the first groove 815 is inclined relative to the normal direction of the radial tangent of the blade 81, and an angle between the length direction of the first groove 815 and the normal direction of the tangent of the blade 81 is an acute angle.
- an angle between the length direction of the first groove 815 and the radial direction of the blade 81 is ⁇ , where ⁇ ranges between 3° and 75°, such as 10°, 20°, 30°, 40°, 50°, or other different angles.
- a height of a single first groove 815 is measured along a height direction of the blade 81, and ranges between 0.1% and 25% of a total height of the blade 81.
- a width of the first groove 815 is measured along a radial length direction of the blade 81, and ranges between 0.1% and 25% of a total length of the blade 81.
- a plurality of first grooves 815 are specifically provided, the plurality of first grooves 815 may be periodically or non-periodically distributed, and a plurality of grooves 811 may be arranged at equal intervals or at non-equal intervals.
- the first grooves 815 may further be provided on different surfaces of the blade 81. As shown in FIG.
- the first grooves 815 are provided on the top surface 812 and the bottom surface of the blade 81.
- the outer end face 814 may be provided with a third groove 817, to further improve air passage.
- the first groove 815 may alternatively be provided on the left side surface 813, the right side surface, and the outer end face 814 of the blade 81, and the groove located on the outer end face 814 is the third groove 817. Examples are not shown herein one by one. When first grooves 815 are respectively provided on the different surfaces of the blade 81, the first grooves 815 on the different surfaces may be arranged in different manners.
- first grooves 815 located on the top surface 812 are periodically arranged, and first grooves 815 located on the bottom surface are non-periodically arranged.
- first grooves 815 on both surfaces are periodically arranged or non-periodically arranged, and both may be applied to this embodiment of this application.
- first groove 815 may be of different shapes.
- First grooves 815 shown in FIG. 13 include streamlined and elliptical first grooves 815, or regular rectangular and triangular first grooves 815.
- the shape of the first groove 815 is not limited to the shapes of the grooves 811 listed above.
- first grooves 815 provided on a same surface may be grooves 811 whose cross sections are of a same shape, or may be grooves 811 whose cross sections are of different shapes.
- the groove 811 provided in this embodiment of this application may also be a second groove 816.
- the second groove 816 includes two parts, forming a herringbone-shaped groove.
- the second groove 816 includes a first groove body 8161 and a second groove body 8162.
- the first groove body 8161 and the second groove body 8162 are inclined relative to each other, and a length direction of each of the first groove body 8161 and the second groove body 8162 forms a specified angle with the normal direction of the tangent of the blade 81.
- shapes of cross sections and sizes of the first groove body 8161 and the second groove body 8162 in the second groove 816 refer to the shape of the cross section and the size of the first groove 815 shown in FIG. 12 . Details are not described herein again.
- the first groove 815 or the second groove 816 may be located on all blades 81 of the fan, or may be located on several blades 81 of the fan.
- the blades 81 having features of the grooves 811 may be periodically distributed, or may be non-periodically distributed. Several consecutive blades 81 may have the features of the grooves 811, or non-consecutive blades 81 may have the features of the grooves 811. Distribution of the grooves 811 needs to be determined based on an actually measured air volume and noise spectral characteristics.
- Movement of the airflow relative to the blade 81 is a combination of velocity Vt along a tangential direction of the blade 81 of the centrifugal impeller 80 and velocity Vr relative to a radius of the centrifugal impeller 80, that is, final relative velocity is Va at a particular point of the blade 81.
- a direction of Va varies with magnitude of the radius of the blade 81. It can be learned from FIG. 15 that, the combined velocity Va of the relative movement is not parallel to the normal direction of the blade 81 (a direction perpendicular to the radial direction of the blade 81).
- a direction of the groove 811 provided in this embodiment of this application should be the same as the direction of Va as much as possible, thereby improving passage of the air through the groove 811.
- the direction of Va varies geometrically with the magnitude of the radius of the blade 81, and varies in movement with a rotation speed of the centrifugal impeller 80. Therefore, there is a suitable angle selection based on a radial position of the groove 811 on the blade 81 and a rotation speed of the centrifugal impeller 80 at a common working point. Usually, an angle ranges between 3° and 75°.
- the length direction of the first groove 815 is set to be parallel to the combined Va as much as possible.
- a herringbone-shaped groove 811 of the blade 81 may be used.
- the inclined groove 811 can enable the air to flow through the groove 811 more smoothly, thereby improving a flow effect of the air.
- the features of the grooves on the surfaces of the blade 81 forcefully divide the large vortices flowing through the surfaces of the blade 81 into small vortices, thereby making energy of the vortices distributed in a wider frequency band range, and reducing concentration of energy of noise.
- the division of the large vortices reduces a possibility of air blocking a flow path.
- an air flow status deteriorates, thereby helping the air flow more smoothly through a flow path between blades and increasing an air volume.
- a size of a fan is also becoming thinner, resulting in a great limitation on a height and a thickness of a blade.
- an inclined groove or a groove of a herringbone shape is formed on top of the blade.
- grooves of adj acent blades may be staggered, to maximally divide the large vortices, thereby improving an air intake effect of the fan, and reducing noise.
- the guide ring 40 and the groove 811 provided in the foregoing embodiment may be used alone to improve the air intake effect of the fan, to increase the air supply volume of the fan.
- the guide ring 40 and the groove 811 provided in the foregoing embodiment are combined to improve the air supply volume of the fan.
- the blade 81 of the centrifugal impeller 80 is provided with the first groove 815, or the second groove 816, or both the first groove 815 and the second groove 816, and the centrifugal impeller 80 is provided with the guide ring 40.
- the guide ring 40 is disposed at a position in a manner described in the foregoing embodiment.
- the guide ring 40 divides an area on the centrifugal impeller 80 into two areas: an area I and an area II, and the first groove 815 or the second groove 816 is provided on the area II.
- the fan has both the guide ring 40 to improve a flow effect of air during bending, and the groove 811 to improve an effect of the air flowing through the blade 81, thereby effectively improving the air supply volume of the fan.
- an embodiment of this application further provides a mobile terminal.
- the mobile terminal includes any one of the foregoing fans 100.
- the mobile terminal is a common mobile terminal such as a notebook computer or a tablet computer.
- the fan 100 is disposed inside a housing 200 of the mobile terminal.
- a guide ring is added to the fan 100, or a groove is added to the fan 100, or, according to the invention, both a groove and a guide ring are added to the fan 100, to improve an air supply volume of the fan 100 and reduce noise of the fan 100.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- This application relates to the field of mobile terminal technologies, and in particular, to a fan and a mobile terminal.
- Due to thinness and lightness requirements of users, terminal products such as a notebook computer and a tablet computer need to be thinner and lighter, and need to have good heat dissipation performance, to achieve relatively good temperature experience. In addition, to improve mute experience of a user, a fan needs to have relatively low noise. In this case, a cooling fan needs to have a relatively high air volume and relatively low noise while having a smallest possible size.
- Due to reduction in a size of a conventional fan, a flow field of an air inlet area of an inlet easily deteriorates, reducing an air volume, and affecting an air supply effect of the fan.
- For example,
DE 102009 028 125 A1 refers to an ingress geometry of fan wheel. Further, GP 754055 refers to a centrifugal fan wheel. Further,CN 106151111A refers to a cooling blower. - This application provides a fan and a mobile terminal, to improve an air supply volume of the fan.The above mentioned problem is solved by the subject matter of the independent claim. Further implementation forms are provided in the dependent claims.
- According to a first aspect, this application provides a fan. The fan includes a housing, the housing is provided with an air inlet and an air outlet, a centrifugal impeller is disposed inside the housing, and the centrifugal impeller may rotate relative to the housing, to transmit air from the air inlet to the air outlet. According to the invention, the centrifugal impeller includes a plurality of blades, and the plurality of blades are disposed around a drive shaft of the centrifugal impeller. To improve an air intake effect, at least one of the plurality of blades is provided with a plurality of grooves, the plurality of grooves are arranged along a radial direction of the blade, and the grooves are inclined at an angle relative to a normal direction of a radial tangent of the blade. The radial direction of the blade is an extending direction of the blade gradually away from the drive shaft.
- In use, movement of an airflow relative to the blade is a combination of velocity along a tangential direction of the blade and velocity relative to a radius of the centrifugal impeller, that is, final relative velocity is not parallel to the normal direction (a direction perpendicular to a direction of the radial tangent of the blade) of the blade. Therefore, to enable air to flow through the grooves more smoothly, the grooves disposed in embodiments of this application are inclined relative to the radial direction, so that a length direction of the grooves is the same as a direction of the relative velocity as much as possible, thereby improving passage of the air through the grooves, further improving a passing effect, and reducing noise caused by the fan.
- In a specific disposition of the grooves, the grooves may be formed in different manners, and the manners are separately described below.
- In a specific implementation not belonging to the invention, the groove is a first groove inclined in a single direction, and an angle between a length direction of the first groove and the normal direction of the radial tangent of the blade is an acute angle. The acute angle may be any angle between 3° and 75°, so that the first groove can better match the relative velocity, thereby improving the passage of the air.
- A plurality of first grooves may be specifically provided on different surfaces of the blade. For example, when the blade has a top surface and a bottom surface opposite to each other, the top surface and the bottom surface each may be provided a first groove, or the top surface or the bottom surface is provided with a first groove. When the blade has opposite side surfaces, the side surfaces of the blade each may also be provided with a first groove. According to the invention a plurality of first grooves are provided on the surfaces of the blade, the plurality of first grooves may be arranged periodically or non-periodically.
- In addition, the first groove may be of different shapes. Specifically, a cross section of the first groove may be rectangular or triangular, or streamlined and elliptical, or of another shape.
- A height of a single first groove is measured along a height direction of the blade, and ranges between 0.1% and 25% of a total height of the blade. A width of the first groove is measured along a radial length direction of the blade, and ranges between 0.1% and 25% of a total length of the blade.
- In another specific implementation, the groove is a second groove of a herringbone shape. Specifically, the second groove includes a first groove body and a second groove body inclined relative to each other, and the first groove body and the second groove body each form an acute angle with the normal direction of the radial tangent of the blade. The acute angle may be any angle between 3° and 75°. In addition, for surfaces on which second grooves are specifically provided and periodicity of arrangement of the second grooves, refer to the foregoing description of the first groove.
- To further improve an air supply effect, an outer end face of the blade is provided with a third groove, further improving a ventilation effect.
- In addition to the foregoing grooves, according to the invention an air intake effect of the fan is further improved by adding a guide ring. Specifically, the drive shaft of the centrifugal impeller is exposed outside the air inlet, the guide ring is fixedly connected to the plurality of blades, and a surface of the guide ring facing the drive shaft is a guide surface. During air intake, air flowing in from the air inlet is guided by the guide surface of the guide ring, thereby improving an effect of air steering, reducing vortices, improving air circulation, and further improving an air intake effect. In specific use not belonging to the present invention, the guide ring may be used independently, or according to the invention is used in combination with the grooves, thereby further improving the air supply effect.
- In a specific disposition, the guide ring may be a complete ring, or may be segmented. In this case, the guide ring includes a plurality of alternately disposed arc segments.
- In addition, the guide ring may be specifically disposed inside the housing, or may be exposed outside the air inlet. In a specific implementation solution, the guide ring is exposed outside the air inlet.
- A cross section of the guide ring may be of different shapes. For example, the cross section of the guide ring is of different shapes, such as circular, elliptical, or bullet-shaped.
- According to a second aspect not belonging to the present invention, a fan is provided. The fan includes a housing, the housing is provided with an air inlet and an air outlet, a centrifugal impeller is disposed inside the housing, and the centrifugal impeller may rotate relative to the housing, to transmit air from the air inlet to the air outlet. In a specific disposition, the centrifugal impeller includes a plurality of blades, and the plurality of blades are disposed around a drive shaft of the centrifugal impeller. To improve an air intake effect, a guide ring is further included, the guide ring is fixedly connected to the plurality of blades, and a surface of the guide ring facing the drive shaft is a guide surface.
- In use, during air intake, air flowing in from the air inlet is guided by the guide surface of the guide ring, thereby improving an effect of air steering, reducing vortices, improving air circulation, and further improving an air intake effect.
- In a specific disposition, the guide ring may be a complete ring, or may be segmented. For example, the guide ring includes a plurality of alternately disposed arc segments.
- In addition, the guide ring may be specifically disposed inside the housing, or may be exposed outside the air inlet. In a specific implementation solution, the guide ring is exposed outside the air inlet.
- A cross section of the guide ring may be of different shapes. For example, the cross section of the guide ring is of different shapes, such as circular, elliptical, or bullet-shaped.
- According to a third aspect, this application further provides a mobile terminal. The mobile terminal includes a housing and any one of the foregoing fans disposed inside the housing. A guide ring is added to the fan, or a groove is added to the fan, or, according to the invention, both a groove and a guide ring are added to the fan, to improve an air supply volume of the fan and reduce noise of the fan.
-
-
FIG. 1 is a schematic structural diagram of a fan according to an embodiment of this application; -
FIG. 2 is a cross-sectional view of a fan according to an embodiment of this application; -
FIG. 3 is a schematic structural diagram of a centrifugal impeller according to an embodiment of this application; -
FIG. 4 to FIG. 8 are each a schematic diagram of a cross section of a guide ring according to an embodiment of this application; -
FIG. 9 is a schematic diagram of dimensions of a fan according to an embodiment of this application; -
FIG. 10 is a schematic diagram of dimensions of a cross section of a guide ring according to an embodiment of this application; -
FIG. 11 is a schematic structural diagram of another centrifugal impeller according to an embodiment of this application; -
FIG. 12 is a schematic structural diagram of a blade according to an embodiment of this application; -
FIG. 13 is a schematic structural diagram of another blade according to an embodiment of this application; -
FIG. 14 is a schematic structural diagram of another blade according to an embodiment of this application; -
FIG. 15 is a schematic diagram of an internal flow field direction of a centrifugal impeller according to an embodiment of this application; -
FIG. 16 is a schematic diagram of an internal flow field direction of the blade shown inFIG. 13 ; -
FIG. 17 is a schematic diagram of an internal flow field direction of the blade shown inFIG. 14 ; and -
FIG. 18 is a schematic structural diagram of a mobile terminal according to an embodiment of this application. - To make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings. It is clear that the described embodiments are merely some rather than all of the embodiments of the present invention.
- In the prior art, a mobile terminal is becoming thinner, and therefore, a fan in the mobile terminal in the prior art is also becoming smaller to match the mobile terminal, causing a decrease in an air supply volume. To improve the air supply volume, an embodiment of this application provides a fan. A structure of the fan provided in this embodiment of this application is improved, to increase the air supply volume of the fan. To help understand the fan provided in this embodiment of this application, the following describes in detail the fan with reference to the accompanying drawings and specific embodiments.
- First, it should be noted that, the fan provided in this embodiment of this application is a centrifugal fan, and the centrifugal fan includes a housing and a centrifugal impeller disposed inside the housing. The centrifugal impeller is rotatably connected to the housing through a drive shaft. An axis of the drive shaft is also an axis of the centrifugal impeller. The housing is provided with an air inlet and an air outlet. In a specific disposition, there may be one air inlet or two air inlets. When there is one air inlet, the air inlet is located on one side of the centrifugal impeller. In this case, the fan is a single-side air intake fan. When there are two air inlets, the two air inlets are provided opposite to each other on two sides of the centrifugal impeller. In this case, the fan is a two-side air intake fan.
- For ease of description, in this embodiment of this application, a single-side air intake fan is used as an example for description.
FIG. 1 is a schematic structural diagram of a fan, andFIG. 2 is a cross-sectional view of a fan. It can be learned fromFIG. 2 that, a housing includes atop cover 10 and abottom cover 20 disposed opposite to each other, and thetop cover 10 and thebottom cover 20 are connected by using a side wall. An air inlet is provided on thetop cover 10, and anair outlet 70 is provided on the side wall. In use, air entering from thetop cover 10 is transmitted to theair outlet 70 on the side wall through acentrifugal impeller 80, and then enters a mobile terminal. Specifically, referring to a line with an arrow inFIG. 2 , the line with the arrow indicates a flow direction of the air. It can be learned fromFIG. 2 that, during air circulation, the flow direction of the air inside the housing is bent at approximately ninety degrees. Due to a relatively small thickness of thetop cover 10 at the air inlet, and a relatively small gap between the top cover and an inner wall surface of a system in which the top cover is located, the air has a relatively large bend at an edge of the air inlet, easily causing a vortex, and affecting an air supply volume of the air in the fan. To reduce loss of the air at the air inlet during bending, thecentrifugal impeller 80 provided in this embodiment of this application is provided with aguide ring 40.FIG. 3 shows a manner of disposing theguide ring 40 on thecentrifugal impeller 80. In a specific disposition, theguide ring 40 is annular, and a center of theguide ring 40 is located on an axis of thecentrifugal impeller 80, to ensure that during rotation, theguide ring 40 can synchronously rotate with thecentrifugal impeller 80, and can be stationary relative to thecentrifugal impeller 80. As shown inFIG. 3 , theguide ring 40 divides an area on thecentrifugal impeller 80 into two areas: an area I and an area II. The area I is an area corresponding to the air inlet. During air intake, the air enters from the area I, flows through ablade 81 after being guided by theguide ring 40, and is guided into the area II through theblade 81. In addition, in addition to being annular, theguide ring 40 may further be of another shape, for example, a ring shape enclosed by a plurality of discontinuous arc segments, or a ring shape with a notch, or other different shapes. - Refer to
FIG. 1 andFIG. 3 together.FIG. 1 is a schematic diagram of a cross section of theguide ring 40. It can be learned from a structure shown inFIG. 1 that, theguide ring 40 has aguide surface 41, and theguide surface 41 is an inner side surface of theguide ring 40. In addition, during mounting of thecentrifugal impeller 80, theguide surface 41 faces an axis of thecentrifugal impeller 80. When thecentrifugal impeller 80 rotates, the air flows through theguide surface 41, and is bent along theguide surface 41. To improve a flow effect of the air during bending, theguide surface 41 is an arc-shaped guide surface. An arc of an edge of theguide surface 41 shown inFIG. 1 may be a different streamline arc such as a circular arc or an elliptical arc. The edge of theguide surface 41 may alternatively not be an arc, or may be non-streamlined. In addition, in a specific implementation, it only needs to be ensured that theguide surface 41 of theguide ring 40 has a particular arc, so that the flow effect of the air during bending can be improved. The guide ring has two functions. One is to use a streamlined design to reduce air resistance, and the other function is to reduce vortices generated by a fluid flowing through thecover 10. Therefore, theguide surface 41 still has a partial effect even if theguide surface 41 is not streamlined. Therefore, a specific shape of the cross section of theguide ring 40 is not limited herein.FIG. 4 to FIG. 8 show different shapes of the cross section of theguide ring 40. It can be learned fromFIG. 4 to FIG. 8 that, the cross section of theguide ring 40 provided in this embodiment may be of different shapes, such as circular, elliptical, bullet-shaped, or runway-shaped. In a specific disposition of theguide ring 40, the cross section of theguide ring 40 may be of different shapes, such as a regular shape, an irregular shape, a symmetrical shape, an asymmetrical shape. - The following describes a structure of the
guide ring 40 disposed on the centrifugal fan by using an example in which the cross section is that of theguide ring 40 shown inFIG. 4 . Referring toFIG. 9 and FIG. 10 , for ease of description, meanings of letters inFIG. 9 and FIG. 10 are described first: r1 is a radius of adrive shaft 50, r2 is an outer diameter of thetop cover 10, r3 is a radius of a center point of the cross section of theguide ring 40, r4 is a radius of anair inlet 30, a is a distance from an upper surface of theguide ring 40 to an upper surface of thetop cover 10, b is a width of the cross section of theguide ring 40, c is a thickness of thetop cover 10, d is a distance from an outer side surface of theguide ring 40 to an inner side surface of thetop cover 10, and h is a height of theguide ring 40. In a specific set, as shown inFIG. 9 , theguide ring 40 is located between thedrive shaft 50 and the outer diameter of thetop cover 10, that is, r1 ≤ r3 ≤ r2. In the foregoing disposition manner, theguide ring 40 may be located on an inner side of the top cover 10 (located inside the air inlet 30) in the radial direction. In this case, r1 ≤ r3 ≤ r4. In the foregoing disposition manner, d ≥ 0. When d = 0, it indicates that an end face of theguide ring 40 away from thedrive shaft 50 is in contact with the inner side surface of thetop cover 10. Alternatively, a structure in which theguide ring 40 is embedded in thetop cover 10 may be used. In this case, r4 ≤ r3 ≤ r2, and d < 0. In this case, theguide ring 40 is located outside theair inlet 30, and between thetop cover 10 and theblade 81. When two different disposition manners are used, a has different values. When theguide ring 40 is located inside theair inlet 30, - 3 mm ≤ a ≤ +3 mm. A negative dimension indicates that the upper surface of theguide ring 40 is higher than the upper surface of thetop cover 10. A positive distance indicates that the upper surface of theguide ring 40 is lower than the upper surface of thetop cover 10. A dimension of 0 indicates that theguide ring 40 and thetop cover 10 are flush. When theguide ring 40 is located outside theair inlet 30, a ≥ c. That is, a height from the upper surface of theguide ring 40 to the upper surface of thetop cover 10 is greater than the thickness of thetop cover 10. That is, the height of theguide ring 40 is less than a gap betweenblade 81 and thetop cover 10. In a specific implementation solution, theguide ring 40 is located at theair inlet 30, that is, theguide surface 41 of theguide ring 40 is closer to thedrive shaft 50 than the inner side surface of thetop cover 10, so that an effect of air steering at theair inlet 30 can be improved by using theguide surface 41. -
FIG. 10 shows dimensions of theguide ring 40. A height h of theguide ring 40 ranges between 0.01 mm and 5 mm. A width b of theguide ring 40 ranges between 0.01 mm and 15 mm. There are different dimensions, for example, h = 0.02 mm, and b = 0.05 mm; or h = 0.05 mm, and b = 0.08 mm; or h = 0.5 mm, and b = 1 mm; or h = 2 mm, and b = 5 mm; or h = 4 mm, b = 10 mm. - In addition, when the
guide ring 40 is specifically fixed to thecentrifugal impeller 80, theguide ring 40 may be fixed to theblade 81 of thecentrifugal impeller 80 in different manners such as bonding, welding, or by using a connection member. In addition, theguide ring 40 and thecentrifugal impeller 80 may alternatively be prepared integrally. Either the foregoing connection or preparation manner may be applied to the fan provided in this embodiment of this application. - In addition to the effect of air steering mentioned in the foregoing description, the
guide ring 40 provided in this embodiment of this application further has the following effect: Because theguide ring 40 and theblade 81 are relatively fixed, when thecentrifugal impeller 80 rotates, relative positions of theimpeller 80 and theguide ring 40 are fixed, and during air circulation, theblade 81 and theguide ring 40 on both sides of the air are relatively fixed, facilitating the air circulation. In the prior art, when the centrifugal impeller rotates and the top cover rotates relative to the blade, and during air circulation, there is relative movement between the blade and the top cover on both sides of the air. Therefore, some disturbances are caused to the flow of the air. It can be learned from the foregoing description that, in the fan provided in this embodiment of this application, theimpeller 80 and theguide ring 40 are relatively fixed to each other, so that an effect of air circulation can be further improved, thereby increasing an air supply volume. - According to the present invention, in addition to the foregoing embodiment in which the air supply volume is improved by using the
guide ring 40, the air supply volume is further improved by improving another structure on thecentrifugal impeller 80.FIG. 11 shows another structure of a fan according to an embodiment of this application. In the structure shown inFIG. 11 , an air supply volume is improved by improving a structure of theblade 81 on thecentrifugal impeller 80. Referring toFIG. 11 , in this embodiment of this application, the air supply volume is improved by providing agroove 811 on theimpeller 80 along a radial direction of theblade 81. The radial direction of theblade 81 is an extending direction of theblade 81 gradually away from the drive shaft. In a specific implementation, a rectangular blade is used for description. For ease of description of a structure and a disposition position of thegroove 811, surfaces of theblade 81 are respectively named. As shown inFIG. 11 , five surfaces of theblade 81 are respectively atop surface 812, a bottom surface (a surface opposite to the top surface 812), aleft side surface 813, a right side surface (a surface opposite to the left side surface 813), and anouter end face 814. Thetop surface 812 and the bottom surface are two surfaces perpendicular to the axis of thecentrifugal impeller 80. Theleft side surface 813, the right side surface, and theouter end face 814 are three side surfaces between thetop surface 812 and the bottom surface. Theouter end face 814 is an end face of theblade 81 away from the axis. Theleft side surface 813 and the right side surface are respectively side surfaces on both sides of theouter end face 814. In addition, along the direction of theblade 81, a direction from the axis of thecentrifugal impeller 80 to theouter end face 814 of theblade 81 is the radial direction of theblade 81. - Referring to
FIG. 11 , to improve an air intake effect of the fan, in the fan provided in this embodiment of this application, at least oneblade 81 is provided with a plurality ofgrooves 811, the plurality ofgrooves 811 are arranged along the radial direction of theblade 81, and thegrooves 811 are inclined at an angle relative to a normal direction of a radial tangent of theblade 81. For eachgroove 811, as shown inFIG. 12 andFIG. 14 , thegroove 811 is inclined relative to the radial direction of theblade 81, both ends of thegroove 811 are open, and there is a specified angle between a length direction of thegroove 811 and the normal direction of the radial tangent of theblade 81. The length direction of thegroove 811 is a direction from one opening of thegroove 811 to the other opening of thegroove 811. A direction of the radial tangent of theblade 81 is the radial direction of theblade 81 when theblade 81 is a straight blade, and is a tangent direction of an arc line on theblade 81 when theblade 81 is a curved blade. - Referring to
FIG. 12 first, a part of theblade 81 of the fan provided in this embodiment of this application is provided with afirst groove 815, thefirst groove 815 is provided on thetop surface 812 of theblade 81. In a specific disposition, the length direction of thefirst groove 815 is inclined relative to the normal direction of the radial tangent of theblade 81, and an angle between the length direction of thefirst groove 815 and the normal direction of the tangent of theblade 81 is an acute angle. As shown inFIG. 12 , an angle between the length direction of thefirst groove 815 and the radial direction of theblade 81 is α, where α ranges between 3° and 75°, such as 10°, 20°, 30°, 40°, 50°, or other different angles. In addition, a height of a singlefirst groove 815 is measured along a height direction of theblade 81, and ranges between 0.1% and 25% of a total height of theblade 81. A width of thefirst groove 815 is measured along a radial length direction of theblade 81, and ranges between 0.1% and 25% of a total length of theblade 81. According to the invention, a plurality offirst grooves 815 are specifically provided, the plurality offirst grooves 815 may be periodically or non-periodically distributed, and a plurality ofgrooves 811 may be arranged at equal intervals or at non-equal intervals. In addition, thefirst grooves 815 may further be provided on different surfaces of theblade 81. As shown inFIG. 13 , thefirst grooves 815 are provided on thetop surface 812 and the bottom surface of theblade 81. In addition, theouter end face 814 may be provided with athird groove 817, to further improve air passage. Similarly, thefirst groove 815 may alternatively be provided on theleft side surface 813, the right side surface, and theouter end face 814 of theblade 81, and the groove located on theouter end face 814 is thethird groove 817. Examples are not shown herein one by one. Whenfirst grooves 815 are respectively provided on the different surfaces of theblade 81, thefirst grooves 815 on the different surfaces may be arranged in different manners. For example,first grooves 815 located on thetop surface 812 are periodically arranged, andfirst grooves 815 located on the bottom surface are non-periodically arranged. Alternatively,first grooves 815 on both surfaces are periodically arranged or non-periodically arranged, and both may be applied to this embodiment of this application. - In addition, a cross section of the
first groove 815 may be of different shapes.First grooves 815 shown inFIG. 13 include streamlined and ellipticalfirst grooves 815, or regular rectangular and triangularfirst grooves 815. Certainly, the shape of thefirst groove 815 is not limited to the shapes of thegrooves 811 listed above. In addition, in a specific disposition,first grooves 815 provided on a same surface may begrooves 811 whose cross sections are of a same shape, or may begrooves 811 whose cross sections are of different shapes. - Referring to
FIG. 14 , in addition to including thefirst groove 815 described above, thegroove 811 provided in this embodiment of this application may also be asecond groove 816. Thesecond groove 816 includes two parts, forming a herringbone-shaped groove. Specifically, thesecond groove 816 includes afirst groove body 8161 and asecond groove body 8162. Thefirst groove body 8161 and thesecond groove body 8162 are inclined relative to each other, and a length direction of each of thefirst groove body 8161 and thesecond groove body 8162 forms a specified angle with the normal direction of the tangent of theblade 81. In a specific disposition, for shapes of cross sections and sizes of thefirst groove body 8161 and thesecond groove body 8162 in thesecond groove 816, refer to the shape of the cross section and the size of thefirst groove 815 shown inFIG. 12 . Details are not described herein again. - In addition, in a specific disposition of the
first groove 815 and thesecond groove 816, thefirst groove 815 or thesecond groove 816 may be located on allblades 81 of the fan, or may be located onseveral blades 81 of the fan. Theblades 81 having features of thegrooves 811 may be periodically distributed, or may be non-periodically distributed. Severalconsecutive blades 81 may have the features of thegrooves 811, ornon-consecutive blades 81 may have the features of thegrooves 811. Distribution of thegrooves 811 needs to be determined based on an actually measured air volume and noise spectral characteristics. - For ease of understanding of the
groove 811 provided in this embodiment of this application, the following describes thegroove 811 in detail with reference to a principle of thegroove 811. As shown inFIG. 15 , relative rotation occurs between thecentrifugal impeller 80 of the fan and thetop cover 10, and the top surface and the bottom surface of theblade 81 each maintain a particular gap with thetop cover 10 and thebottom cover 20. Relative movement of an airflow between thetop cover 10 and theblade 81 is shown inFIG. 15 : Movement of the airflow relative to theblade 81 is a combination of velocity Vt along a tangential direction of theblade 81 of thecentrifugal impeller 80 and velocity Vr relative to a radius of thecentrifugal impeller 80, that is, final relative velocity is Va at a particular point of theblade 81. A direction of Va varies with magnitude of the radius of theblade 81. It can be learned fromFIG. 15 that, the combined velocity Va of the relative movement is not parallel to the normal direction of the blade 81 (a direction perpendicular to the radial direction of the blade 81). Therefore, to allow air between thecentrifugal impeller 80 and thetop cover 10 to flow through thegroove 811 more smoothly, a direction of thegroove 811 provided in this embodiment of this application should be the same as the direction of Va as much as possible, thereby improving passage of the air through thegroove 811. - The direction of Va varies geometrically with the magnitude of the radius of the
blade 81, and varies in movement with a rotation speed of thecentrifugal impeller 80. Therefore, there is a suitable angle selection based on a radial position of thegroove 811 on theblade 81 and a rotation speed of thecentrifugal impeller 80 at a common working point. Usually, an angle ranges between 3° and 75°. In a structure shown inFIG. 16 , the length direction of thefirst groove 815 is set to be parallel to the combined Va as much as possible. In addition, to disperse large vortices to a greater extent, a herringbone-shapedgroove 811 of theblade 81 may be used. For details, refer toFIG. 17 . As shown inFIG. 16 and FIG. 17 , theinclined groove 811 can enable the air to flow through thegroove 811 more smoothly, thereby improving a flow effect of the air. - It can be learned from the foregoing description that, when the
grooves 811 are used, the features of the grooves on the surfaces of theblade 81 forcefully divide the large vortices flowing through the surfaces of theblade 81 into small vortices, thereby making energy of the vortices distributed in a wider frequency band range, and reducing concentration of energy of noise. In addition, the division of the large vortices reduces a possibility of air blocking a flow path. Particularly, in a non-design condition, an air flow status deteriorates, thereby helping the air flow more smoothly through a flow path between blades and increasing an air volume. - In a specific implementation, because a mobile terminal device such as a notebook computer or a tablet computer is becoming thinner, a size of a fan is also becoming thinner, resulting in a great limitation on a height and a thickness of a blade. To make maximum use of the features of the grooves, in the fan provided in this embodiment of this application, an inclined groove or a groove of a herringbone shape is formed on top of the blade. In addition, grooves of adj acent blades may be staggered, to maximally divide the large vortices, thereby improving an air intake effect of the fan, and reducing noise.
- According to embodiments not belonging to the present invention, the
guide ring 40 and thegroove 811 provided in the foregoing embodiment may be used alone to improve the air intake effect of the fan, to increase the air supply volume of the fan. According to the invention, theguide ring 40 and thegroove 811 provided in the foregoing embodiment are combined to improve the air supply volume of the fan.
In this case, theblade 81 of thecentrifugal impeller 80 is provided with thefirst groove 815, or thesecond groove 816, or both thefirst groove 815 and thesecond groove 816, and thecentrifugal impeller 80 is provided with theguide ring 40. Theguide ring 40 is disposed at a position in a manner described in the foregoing embodiment. Theguide ring 40 divides an area on thecentrifugal impeller 80 into two areas: an area I and an area II, and thefirst groove 815 or thesecond groove 816 is provided on the area II. When the structure including theguide ring 40 and thegroove 811 is used, the fan has both theguide ring 40 to improve a flow effect of air during bending, and thegroove 811 to improve an effect of the air flowing through theblade 81, thereby effectively improving the air supply volume of the fan. - As shown in
FIG. 18 , an embodiment of this application further provides a mobile terminal. The mobile terminal includes any one of the foregoingfans 100. In a specific disposition, the mobile terminal is a common mobile terminal such as a notebook computer or a tablet computer. As shown inFIG. 18 , thefan 100 is disposed inside ahousing 200 of the mobile terminal. A guide ring is added to thefan 100, or a groove is added to thefan 100, or, according to the invention, both a groove and a guide ring are added to thefan 100, to improve an air supply volume of thefan 100 and reduce noise of thefan 100.
Claims (8)
- A fan comprising a housing and a centrifugal impeller disposed inside the housing and rotatable relative to the housing, wherein the centrifugal impeller (80) comprises a plurality of blades (81), wherein:∘ each blade among the plurality of blades (81) has a top surface and a bottom surface disposed opposite to each other,∘ at least one of the plurality of blades (81) is provided with a plurality of grooves (811) arranged along a radial direction on the top surface and/or the bottom surface of the blade, and the plurality of grooves (811) extend in a direction, which is inclined at an angle relative to a normal direction of a radial tangent of the blade, a direction of the radial tangent of the blade being the radial direction of the blade when the blade is a straight blade, and is a tangent direction of an arc line on the blade when the blade is a curved blade,∘ the fan has an air inlet (30), wherein a drive shaft (50) of the centrifugal impeller (80) is exposed outside the air inlet (30),∘ the fan further comprises a guide ring (40), wherein the guide ring (40) is fixedly connected to the plurality of blades (81), and a surface of the guide ring (40) facing the drive shaft (50) is a guide surface (41), and characterized in that the guide ring (40) divides an area on the centrifugal impleller (80) into two areas, an area I closer to the drive shaft (50) and an area II further away from the drive shaft (50), wherein the plurality of grooves (811) is provided in the area II.
- The fan according to claim 1, wherein each groove among the plurality of grooves is inclined in a single direction, and an angle between a length direction of the groove and the normal direction of the radial tangent of the blade is an acute angle.
- The fan according to claim 1, wherein a cross section of the groove is rectangular or triangular.
- The fan according to claim 1, wherein each groove among the plurality of grooves is of a herringbone shape, the groove comprises a first groove body and a second groove body inclined relative to each other, and the first groove body and the second groove body each form an angle with the normal direction of the radial tangent of the blade.
- The fan according to any one of claims 2 to 4, wherein the blade has an outer end face, and the outer end face is provided with a further groove (817).
- The fan according to any one of claims 1 - 5, wherein the guide ring comprises a plurality of arc segments arranged at intervals.
- The fan according to any one of claims 1 - 5, wherein the guide ring is exposed outside the air inlet.
- The fan according to any one of claims 1 - 5, wherein a cross section of the guide ring is circular, elliptical, or bullet-shaped.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2018/075171 WO2019148468A1 (en) | 2018-02-02 | 2018-02-02 | Fan and mobile terminal |
Publications (3)
Publication Number | Publication Date |
---|---|
EP3736449A1 EP3736449A1 (en) | 2020-11-11 |
EP3736449A4 EP3736449A4 (en) | 2021-01-13 |
EP3736449B1 true EP3736449B1 (en) | 2023-04-05 |
Family
ID=67478595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18903083.6A Active EP3736449B1 (en) | 2018-02-02 | 2018-02-02 | Fan and mobile terminal |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3736449B1 (en) |
CN (1) | CN110892160B (en) |
WO (1) | WO2019148468A1 (en) |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103967808B (en) * | 2013-02-05 | 2016-12-28 | 建准电机工业股份有限公司 | Centrifugal fan |
Family Cites Families (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB754055A (en) * | 1953-08-05 | 1956-08-01 | Westinghouse Electric Int Co | Improvements in or relating to centrifugal fan wheels |
KR20020009138A (en) * | 2000-07-24 | 2002-02-01 | 구자홍 | Turbo fan |
JP3969354B2 (en) * | 2003-06-23 | 2007-09-05 | 松下電器産業株式会社 | Centrifugal fan and its application |
CN101063456A (en) * | 2006-04-24 | 2007-10-31 | 乐金电子(天津)电器有限公司 | Electric machine rotational axis inserted hole anti deforming, loosening and releasing structure of moisture removing device fan leaf |
CN101463831B (en) * | 2007-12-19 | 2011-07-27 | 富准精密工业(深圳)有限公司 | Cooling fan and its fan blades |
CN101498317B (en) * | 2008-02-01 | 2012-03-14 | 富准精密工业(深圳)有限公司 | Heat radiating fun and impeller thereof |
CN201560981U (en) * | 2009-07-15 | 2010-08-25 | 鑫贺精密电子(东莞)有限公司 | Blade structure of radiation fan |
DE102009028125A1 (en) * | 2009-07-30 | 2011-02-03 | Robert Bosch Gmbh | Entry geometry for semi-axial fan wheels |
CN102478020B (en) * | 2010-11-24 | 2015-06-03 | 台达电子工业股份有限公司 | Centrifugal fan and fan blade thereof |
JP5203478B2 (en) * | 2011-03-02 | 2013-06-05 | シャープ株式会社 | Cross-flow fan, molding die and fluid feeder |
CN202056098U (en) * | 2011-05-26 | 2011-11-30 | 中达电子零组件(吴江)有限公司 | Low-noise computer fan |
TWI544153B (en) * | 2011-10-31 | 2016-08-01 | 鴻準精密工業股份有限公司 | Heat dissipation fan |
CN103629129A (en) * | 2013-11-20 | 2014-03-12 | 广州商科信息科技有限公司 | Fan and fan device |
CN203906382U (en) * | 2014-05-23 | 2014-10-29 | 宁波朗迪叶轮机械有限公司 | Tilting-back oblique flow blade assembly |
CN104613056A (en) * | 2015-01-21 | 2015-05-13 | 北京超微上达科技有限公司 | Bionic drag reduction surface for herringbone structure |
DE102015004200B4 (en) * | 2015-03-27 | 2024-04-04 | Sew-Eurodrive Gmbh & Co Kg | Radial fan with fan blades arranged on a base body |
CN104929977B (en) * | 2015-04-30 | 2018-03-13 | 广东美的制冷设备有限公司 | Centrifugal wind wheel |
CN106151111A (en) * | 2016-08-08 | 2016-11-23 | 常州大学 | A kind of train low noise cooling blower |
CN206785722U (en) * | 2017-02-09 | 2017-12-22 | 周家辉 | A kind of noise reduction drag reduction fan |
-
2018
- 2018-02-02 WO PCT/CN2018/075171 patent/WO2019148468A1/en unknown
- 2018-02-02 EP EP18903083.6A patent/EP3736449B1/en active Active
- 2018-02-02 CN CN201880039253.6A patent/CN110892160B/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103967808B (en) * | 2013-02-05 | 2016-12-28 | 建准电机工业股份有限公司 | Centrifugal fan |
Also Published As
Publication number | Publication date |
---|---|
EP3736449A4 (en) | 2021-01-13 |
CN110892160B (en) | 2022-02-25 |
CN110892160A (en) | 2020-03-17 |
WO2019148468A1 (en) | 2019-08-08 |
EP3736449A1 (en) | 2020-11-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8721280B2 (en) | Propeller fan | |
JP6401727B2 (en) | Outdoor unit for blower and air conditioner | |
US7244099B2 (en) | Multi-vane centrifugal fan | |
EP2213882B1 (en) | Centrifugal fan | |
CN107850083B (en) | Blower and air conditioner equipped with same | |
JP2003532026A (en) | Ventilator, especially for ventilation of electronic equipment | |
KR20000023522A (en) | Axial flow blower | |
KR20050005086A (en) | Stator of Axial flow fan shroud | |
CN108457905B (en) | Volute tongue, cross-flow fan and air conditioner | |
EP3736449B1 (en) | Fan and mobile terminal | |
JP6005256B2 (en) | Impeller and axial flow blower using the same | |
CN110118198B (en) | Centrifugal fan | |
WO2019065679A1 (en) | Fan | |
US11371530B2 (en) | Fan and fan impeller thereof | |
JP2006125229A (en) | Sirocco fan | |
JP3902193B2 (en) | Multi-blade centrifugal blower | |
JP2018035797A (en) | Axial fan and outdoor unit | |
JP6583558B2 (en) | Centrifugal blower | |
KR101826348B1 (en) | Cross-flow fan and air conditioner equipped therewith | |
US11852158B1 (en) | Fan and impeller | |
JP7387013B2 (en) | centrifugal blower | |
CN115450951A (en) | Fan and air conditioning device | |
JP2000045999A (en) | Electrodynamic fan | |
JP5589989B2 (en) | Centrifugal blower | |
JPH05288196A (en) | Air conditioner |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20200807 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
A4 | Supplementary search report drawn up and despatched |
Effective date: 20201214 |
|
RIC1 | Information provided on ipc code assigned before grant |
Ipc: F04D 29/66 20060101ALI20201208BHEP Ipc: F04D 29/28 20060101ALI20201208BHEP Ipc: F04D 29/30 20060101AFI20201208BHEP |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20221128 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: REF Ref document number: 1558423 Country of ref document: AT Kind code of ref document: T Effective date: 20230415 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602018048206 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20230405 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1558423 Country of ref document: AT Kind code of ref document: T Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: PT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230807 Ref country code: NO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230705 Ref country code: ES Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: AT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: RS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: PL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: LV Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230805 Ref country code: HR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230706 Ref country code: AL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R097 Ref document number: 602018048206 Country of ref document: DE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SM Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: SK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: RO Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: EE Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: DK Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: CZ Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
26N | No opposition filed |
Effective date: 20240108 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20240116 Year of fee payment: 7 Ref country code: GB Payment date: 20240108 Year of fee payment: 7 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SI Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20230405 |