US20200362880A1 - Centrifugal fan and electronic device - Google Patents
Centrifugal fan and electronic device Download PDFInfo
- Publication number
- US20200362880A1 US20200362880A1 US16/557,473 US201916557473A US2020362880A1 US 20200362880 A1 US20200362880 A1 US 20200362880A1 US 201916557473 A US201916557473 A US 201916557473A US 2020362880 A1 US2020362880 A1 US 2020362880A1
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- US
- United States
- Prior art keywords
- fan
- exhaust port
- air exhaust
- central axis
- flow channel
- 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.)
- Abandoned
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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
- 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
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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
- F04D29/422—Discharge tongues
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/1613—Constructional details or arrangements for portable computers
- G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
- G06F1/1656—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories
- G06F1/1658—Details related to functional adaptations of the enclosure, e.g. to provide protection against EMI, shock, water, or to host detachable peripherals like a mouse or removable expansions units like PCMCIA cards, or to provide access to internal components for maintenance or to removable storage supports like CDs or DVDs, or to mechanically mount accessories related to the mounting of internal components, e.g. disc drive or any other functional module
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
- G06F1/206—Cooling means comprising thermal management
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2200/00—Indexing scheme relating to G06F1/04 - G06F1/32
- G06F2200/20—Indexing scheme relating to G06F1/20
- G06F2200/201—Cooling arrangements using cooling fluid
Definitions
- the present invention relates to a centrifugal fan and an electronic device.
- An electronic device such as a portable Laptop Personal Computer includes a centrifugal fan that radiates heat generated from electronic components in a chassis to the outside (refer to Japanese Unexamined Patent Application Publication No. 2011-227925, for example). Radiating fins are provided in an air exhaust port of this centrifugal fan.
- centrifugal fan since centrifugal force is applied to discharge fluid, which makes a fluid flow at an air exhaust port uneven, the fluid sometimes hits against only a part of the radiating fins.
- the present invention has been made in view of the above-described problem, and aims at improving the cooling performance of the centrifugal fan.
- a centrifugal fan includes a fan rotating about a central axis and a fan casing enclosing the fan and having an air intake port formed in an axial direction in which the central axis extends and an air exhaust port formed in an orthogonal direction orthogonal to the central axis, radiating fins being provided in the air exhaust port, wherein a tongue portion close to the fan and an inner flow channel going around the fan from the tongue portion to the air exhaust port are formed in the fan casing, and the fan casing has a metallic plate forming at least one of a top face and a bottom face facing each other in the axial direction, and a protruding portion formed on the metallic plate and projecting toward a blow-out side of the inner flow channel opposite the tongue portion.
- the metallic plate may be a copper plate.
- the protruding portion may be formed by recessing a part of the metallic plate.
- the protruding portion may assume a triangular shape having a hypotenuse extending in a direction of crossing a main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- a plurality of the protruding portions may be provided with space in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- the protruding portion may be provided on the air exhaust port side from the central axis in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- the protruding portion may be formed on one of the top face and the bottom face, and a heat pipe connected to the radiating fins may be provided on the other of the top face and the bottom face.
- an electronic device includes the centrifugal fan described before.
- the above-described aspects of the present invention can improve the cooling performance of the centrifugal fan.
- FIG. 1 is a perspective view of an electronic device according to an embodiment of the present invention.
- FIG. 2 is a perspective view of a centrifugal fan according to an embodiment of the present invention.
- FIG. 3 is a top cross-sectional view of a centrifugal fan according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view along an arrow I-I in FIG. 3 .
- FIG. 5 is an enlarged perspective view illustrating a modified example of protruding portions according to an embodiment of the present invention.
- FIG. 6 is a cross-sectional view illustrating a modified example of protruding portions according to an embodiment of the present invention.
- FIG. 7 is a diagram showing a relationship between the number of protruding portions and cooling performance of the centrifugal fan according to an embodiment of the present invention.
- FIG. 1 is a perspective view of an electronic device 1 according to an embodiment of the present invention.
- the electronic device 1 includes a chassis 10 and a lid 20 .
- This electronic device 1 is a clam shell type Laptop Personal Computer (a so-called note-type Personal Computer).
- the chassis 10 is formed in a flat box shape.
- a keyboard 11 and a touch pad 12 are provided on an upper face 10 a of the chassis 10 .
- the keyboard 11 is disposed at a far side of the upper face 10 a and the touch pad 12 is disposed at a near side of the upper face 10 a .
- palm rest portions 13 are formed at both right and left sides of the touch pad 12 on the upper face 10 a.
- the lid 20 includes a display device 21 on its face facing the upper face 10 a of the chassis 10 .
- the display device 21 is formed of a liquid crystal display or an organic EL display, for example.
- a lower end of the lid 20 is coupled to a hinge (not shown) provided on a rear side of the chassis 10 so as to rotate around an axis extending in the right/left direction.
- the lid 20 When the lid 20 is opened as shown in FIG. 1 , the display device 21 faces a front side and the upper face 10 a of the chassis 10 is opened. On the other hand, when the lid 20 is closed, the lid 20 serves as a cover for covering the display device 21 and the upper face 10 a of the chassis 10 .
- a motherboard 30 , a centrifugal fan 31 , and a battery (not shown) etc. are provided in the chassis 10 .
- Air exhaust ports 14 and a USB (Universal Serial Bus) receptacle 32 are opened in the left side face 10 b of the chassis 10 .
- a plurality of the air exhaust ports 14 are formed from the far side to the near side of the left side face 10 b.
- the motherboard 30 is fixed by screwing to a plurality of bosses (not shown) provided upright on the bottom of the chassis 10 and is disposed with space and in substantially parallel oppositely to the bottom. This motherboard 30 is disposed at the back side of the keyboard 11 and provided over an area approximately half the size of the chassis 10 .
- the centrifugal fan 31 is disposed in the far left corner of the chassis 10 .
- the centrifugal fan 31 cools the motherboard 30 via a heat pipe 31 a and exhausts air in the chassis 10 to the outside through the air exhaust ports 14 .
- air intake ports or gaps (not shown) for taking in outside air into the chassis 10 are formed in the upper face 10 a or a bottom face etc. of the chassis 10 .
- FIG. 2 is a perspective view of a centrifugal fan 31 according to an embodiment of the present invention.
- FIG. 3 is a top cross-sectional view of a centrifugal fan 31 according to an embodiment of the present invention.
- FIG. 4 is a cross-sectional view along an arrow I-I in FIG. 3 .
- a pressing member 33 is attached to the heat pipe 31 a extending from the centrifugal fan 31 .
- the pressing member 33 presses the heat pipe 31 a against a heat generation component (for example, CPU) of the motherboard 30 .
- the heat pipe 31 a is thermally connected to radiating fins 34 provided in an air exhaust port 50 b of the centrifugal fan 31 and transports the heat of the heat generation component to the radiating fins 34 .
- the centrifugal fan 31 includes a fan 40 rotating about a central axis O and a fan casing 50 enclosing the fan 40 .
- An air intake port 50 a and the air exhaust port 50 b are formed in the fan casing 50 .
- the air intake port 50 a is opened in an axial direction in which the central axis O of the fan 40 extends, and the air exhaust port 50 b is opened in an orthogonal direction orthogonal to the axial direction.
- the above-described plurality of radiating fins 34 are disposed in the air exhaust port 50 b.
- the fan casing 50 includes a cover 51 enclosing an upper part of the fan 40 and a frame 52 enclosing a lower part of the fan 40 .
- the above-described air intake port 50 a is formed in the cover 51 .
- a plurality of air intake ports 50 a are also formed in the frame 52 as illustrated in FIG. 3 , and air is taken in from upper and lower faces of the fan casing 50 .
- the fan 40 includes a hub 41 rotating about a central axis O and a plurality of blades 42 provided on an outer periphery of the hub 41 .
- the fan 40 according to the present embodiment includes a ring plate 43 to which ends of the plurality of blades 42 are annularly connected in a circumferential direction around the central axis O.
- These hub 41 , blades 42 , and ring plate 43 are integrally formed of resin material. It is to be noted that at least one of the hub 41 , the blades 42 , and the ring plate 43 may be formed of metallic material.
- the hub 41 is formed in a topped cylindrical shape and connected to a motor (not shown) fixed to the frame 52 of the fan casing 50 .
- the plurality of blades 42 are formed in a substantially S-shape when viewed from the axial direction in which the central axis O extends. This shape of the blades 42 makes noise relatively low even at time of high wind pressure.
- a centrifugal fan 31 is also referred to as a silent fan.
- a tongue portion 54 close (i.e., functionally adjacent) to the fan 40 and an inner flow channel 55 going around the fan 40 from the tongue portion 54 to the air exhaust port 50 b are formed in the fan casing 50 .
- the inner flow channel 55 forms a scroll flow channel in which a clearance between the fan casing 50 and the fan 40 is narrowest at the tongue portion 54 , and the clearance between the fan casing 50 and the fan 40 becomes gradually larger as it goes from the tongue portion 54 to a rotational direction (a direction shown by an arrow in FIG. 3 ) going around the fan 40 .
- blow-out side of the inner flow channel 55 refers, when a first straight line L 1 connecting the central axis O and the air exhaust port 50 b in the shortest distance among orthogonal directions orthogonal to the central axis O is regarded as a border line, to a side of the inner flow channel 55 opposite the side where the tongue portion 54 is disposed across the first straight line L 1 (that is, it refers to a side of the page lower than the first straight line L 1 in FIG. 3 ).
- Protruding portions 60 are protrusively provided on the blow-out side of the inner flow channel 55 .
- the protruding portions 60 are provided on the cover 51 , of the cover 51 forming a top face 50 d (refer to FIG. 4 ) of the fan casing 50 and the frame 52 forming a bottom face 50 e of the fan casing 50 .
- the cover 51 is formed of a copper plate (metallic plate).
- the frame 52 is formed of a stainless steel plate (metallic plate).
- a plurality of (two in the present embodiment) protruding portions 60 are provided with space in a main flow direction F on the blow-out side of the inner flow channel 55 when viewed from the axial direction.
- the main flow direction F is a direction in which fluid flows straight toward the air exhaust port 50 b along an inner side face 50 c of the fan casing 50 on the blow-out side of the inner flow channel 55 and, in the present embodiment, is a direction parallel to the above-described first straight line L 1 .
- the protruding portion 60 assumes a triangular shape having a hypotenuse 61 extending in a direction of crossing the main flow direction F when viewed from the axial direction.
- the hypotenuse 61 makes an acute angle (for example, about 30° to 60°) with the main flow direction F.
- the radiating fins 34 are disposed on an extension of the hypotenuse 61 .
- the slope of the hypotenuse 61 may be such that the extension of the hypotenuse 61 heads toward the radiating fins 34 disposed in the center of the air exhaust port 50 b.
- the protruding portions 60 are provided on the air exhaust port 50 b side from the central axis O in the main flow direction F when viewed from the axial direction. That is, the protruding portions 60 are provided on a side of the inner flow channel 55 where the air exhaust port 50 b is disposed, when a second straight line L 2 orthogonal to the above-described first straight line L 1 among orthogonal directions orthogonal to the central axis O is regarded as a border line (that is, they are provided on the left side of the page from the second straight line L 2 in FIG. 3 ). It is to be noted that the protruding portions 60 are more preferably provided on the air exhaust port 50 b side from one third of a radius R of the fan 40 , on the air exhaust port 50 b side of the inner flow channel 55 .
- Such protruding portions 60 are formed by recessing a part of the cover 51 (copper plate) as shown in FIG. 2 and FIG. 4 . That is, the protruding portions 60 are formed into a bottomed cylindrical shape with a part of the cover 51 recessed by press working. These protruding portions 60 are formed at positions spaced from the inner side face 50 c of the inner flow channel 55 as shown in FIG. 3 . It is to be noted that the protruding portions 60 may be formed by cutting and bending an edge of the cover 51 into a triangular shape as shown in a perspective view of a modified example shown in FIG. 5 , and a cross-sectional view of a modified example shown in FIG. 6 .
- the centrifugal fan 31 structured above includes the fan 40 rotating about the central axis O and the fan casing 50 enclosing the fan 40 and having the air intake port 50 a formed in the axial direction in which the central axis O extends and the air exhaust port 50 b formed in the orthogonal direction orthogonal to the central axis O, the radiating fins 34 being provided in the air exhaust port 50 b , the tongue portion 54 close to the fan 40 and the inner flow channel 55 going around the fan 40 from the tongue portion 54 to the air exhaust port 50 b are formed in the fan casing 50 , the fan casing 50 has the cover 51 (metallic plate) forming the top face 50 d facing in the axial direction, and the protruding portions 60 projecting toward the blow-out side of the inner flow channel 55 opposite the tongue portion 54 are formed on the cover 51 , which distributes the fluid flow in the main flow direction F toward the air exhaust port 50 b along the inner side face 50 c of the fan casing 50 and allows
- the cover 51 on which the protruding portions 60 are formed is a copper plate in the present embodiment, it has excellent thermal conductivity and good workability.
- the protruding portion 60 can be easily formed by recessing a part of the cover 51 by press working etc. It is to be noted that no fluid leaks out from the inner flow channel 55 since forming the protruding portion 60 by recessing does not form any gap or hole in the cover 51 in working compared to the protruding portion 60 of the modified example (cutting and bending) shown in FIG. 5 . Thus, it is possible to prevent reduction in air flow of the centrifugal fan 31 .
- the protruding portions 60 can be easily formed while avoiding interference with the heat pipe 31 a by forming the protruding portions 60 on the cover 51 .
- the protruding portion 60 assumes a triangular shape having the hypotenuse 61 extending in a direction of crossing the main flow direction F on the blow-out side of the inner flow channel 55 when viewed from the axial direction as shown in FIG. 3 , the fluid flow in the main flow direction F can be smoothly distributed toward the radiating fins 34 provided in the center of the air exhaust port 50 b .
- the protruding portions 60 are formed at positions spaced from the inner side face 50 c of the inner flow channel 55 , the original fluid flow in the main flow direction F cannot be blocked.
- FIG. 7 is a diagram showing a relationship between the number of protruding portions 60 and cooling performance of the centrifugal fan 31 according to an embodiment of the present invention. In the drawing, it is shown that the performance becomes higher in order of “Fair,” “Good,” and “Excellent.” It is to be noted that “ONE PROTRUDING PORTION” indicates the case where the protruding portion 60 is provided only at a position indicated by a symbol (B) in FIG. 3 , “TWO PROTRUDING PORTIONS” indicates the case where the protruding portions 60 are provided at positions indicated by a symbol (A) and the symbol (B) in FIG. 3 , and “THREE PROTRUDING PORTIONS” indicates the case where the protruding portions 60 are provided at positions indicated by the symbol (A), the symbol (B), and a symbol (C) in FIG. 3 .
- Two (performance “Excellent”) or three (performance “Good”) protruding portions 60 are more preferable in performance than one protruding portion 60 (performance “Fair”) as shown in FIG. 7 . That is, it is found that provision of two or three protruding portions 60 allows the fluid flow in the main flow direction F to be fully distributed. Thus, it is preferable, as shown in FIG. 3 , that the plurality of protruding portions 60 are provided with space in the main flow direction F on the blow-out side of the inner flow channel 55 when viewed from the axial direction.
- protruding portions 60 are more preferable in performance than three protruding portions 60 (performance “Good”).
- performance “Excellent” two protruding portions 60
- performance “Good” two protruding portions 60
- the protruding portion 60 at the position indicated by the symbol (C) in FIG. 3 is located at substantially the same position as the central axis O in the main flow direction F. That is, it is thought that the fluid is still in a swirling state in the inner flow channel 55 at the position indicated by the symbol (C), and after the fluid came into collision with the hypotenuse 61 of the protruding portion 60 at an angle, the flow rate of the fluid dropped and the distribution function by the hypotenuse 61 was reduced.
- the protruding portions 60 are provided on the air exhaust port 50 b side from the central axis O in the main flow direction F on the blow-out side of the inner flow channel 55 when viewed from the axial direction. More preferably, it is more preferable that the protruding portions 60 are provided on the air exhaust port 50 b side from one third of the radius R of the fan 40 on which side the fluid flows straight along the inner side face 50 c of the inner flow channel 55 , on the air exhaust port 50 b side from the central axis O.
- the protruding portions 60 may be formed on the frame 52 forming the bottom face 50 e .
- the protruding portions 60 may be formed on both the cover 51 and the frame 52 .
- the protruding portions 60 may be provided on a part whose fluid intake amount is smaller (that is, the part opposed to a part whose fluid intake amount is larger (the cover 51 or the frame 52 )).
Abstract
A centrifugal fan includes a fan rotating about a central axis; and a fan casing enclosing the fan and having an air intake port formed in an axial direction in which the central axis extends and an air exhaust port formed in an orthogonal direction orthogonal to the central axis, radiating fins being provided in the air exhaust port, a tongue portion close to the fan and an inner flow channel going around the fan from the tongue portion to the air exhaust port are formed in the fan casing, and the fan casing has a cover (metallic plate) forming at least one of a top face and a bottom face facing each other in the axial direction, and a protruding portion formed on the cover and projecting toward a blow-out side of the inner flow channel opposite the tongue portion.
Description
- The present invention relates to a centrifugal fan and an electronic device.
- An electronic device such as a portable Laptop Personal Computer includes a centrifugal fan that radiates heat generated from electronic components in a chassis to the outside (refer to Japanese Unexamined Patent Application Publication No. 2011-227925, for example). Radiating fins are provided in an air exhaust port of this centrifugal fan.
- In a centrifugal fan, since centrifugal force is applied to discharge fluid, which makes a fluid flow at an air exhaust port uneven, the fluid sometimes hits against only a part of the radiating fins.
- The present invention has been made in view of the above-described problem, and aims at improving the cooling performance of the centrifugal fan.
- In order to solve the above-described problem, a centrifugal fan according to one aspect of the present invention includes a fan rotating about a central axis and a fan casing enclosing the fan and having an air intake port formed in an axial direction in which the central axis extends and an air exhaust port formed in an orthogonal direction orthogonal to the central axis, radiating fins being provided in the air exhaust port, wherein a tongue portion close to the fan and an inner flow channel going around the fan from the tongue portion to the air exhaust port are formed in the fan casing, and the fan casing has a metallic plate forming at least one of a top face and a bottom face facing each other in the axial direction, and a protruding portion formed on the metallic plate and projecting toward a blow-out side of the inner flow channel opposite the tongue portion.
- In addition, in the above-described centrifugal fan, the metallic plate may be a copper plate.
- In addition, in the above-described centrifugal fan, the protruding portion may be formed by recessing a part of the metallic plate.
- In addition, in the above-described centrifugal fan, the protruding portion may assume a triangular shape having a hypotenuse extending in a direction of crossing a main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- In addition, in the above-described centrifugal fan, a plurality of the protruding portions may be provided with space in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- In addition, in the above-described centrifugal fan, the protruding portion may be provided on the air exhaust port side from the central axis in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
- In addition, in the above-described centrifugal fan, the protruding portion may be formed on one of the top face and the bottom face, and a heat pipe connected to the radiating fins may be provided on the other of the top face and the bottom face.
- In addition, an electronic device according to one aspect of the present invention includes the centrifugal fan described before.
- The above-described aspects of the present invention can improve the cooling performance of the centrifugal fan.
-
FIG. 1 is a perspective view of an electronic device according to an embodiment of the present invention. -
FIG. 2 is a perspective view of a centrifugal fan according to an embodiment of the present invention. -
FIG. 3 is a top cross-sectional view of a centrifugal fan according to an embodiment of the present invention. -
FIG. 4 is a cross-sectional view along an arrow I-I inFIG. 3 . -
FIG. 5 is an enlarged perspective view illustrating a modified example of protruding portions according to an embodiment of the present invention. -
FIG. 6 is a cross-sectional view illustrating a modified example of protruding portions according to an embodiment of the present invention. -
FIG. 7 is a diagram showing a relationship between the number of protruding portions and cooling performance of the centrifugal fan according to an embodiment of the present invention. -
FIG. 1 is a perspective view of an electronic device 1 according to an embodiment of the present invention. - The electronic device 1 includes a
chassis 10 and alid 20. This electronic device 1 is a clam shell type Laptop Personal Computer (a so-called note-type Personal Computer). - The
chassis 10 is formed in a flat box shape. Akeyboard 11 and atouch pad 12 are provided on anupper face 10 a of thechassis 10. Thekeyboard 11 is disposed at a far side of theupper face 10 a and thetouch pad 12 is disposed at a near side of theupper face 10 a. In addition,palm rest portions 13 are formed at both right and left sides of thetouch pad 12 on theupper face 10 a. - The
lid 20 includes adisplay device 21 on its face facing theupper face 10 a of thechassis 10. Thedisplay device 21 is formed of a liquid crystal display or an organic EL display, for example. A lower end of thelid 20 is coupled to a hinge (not shown) provided on a rear side of thechassis 10 so as to rotate around an axis extending in the right/left direction. - When the
lid 20 is opened as shown inFIG. 1 , thedisplay device 21 faces a front side and theupper face 10 a of thechassis 10 is opened. On the other hand, when thelid 20 is closed, thelid 20 serves as a cover for covering thedisplay device 21 and theupper face 10 a of thechassis 10. - A
motherboard 30, acentrifugal fan 31, and a battery (not shown) etc. are provided in thechassis 10.Air exhaust ports 14 and a USB (Universal Serial Bus)receptacle 32 are opened in theleft side face 10 b of thechassis 10. A plurality of theair exhaust ports 14 are formed from the far side to the near side of theleft side face 10 b. - The
motherboard 30 is fixed by screwing to a plurality of bosses (not shown) provided upright on the bottom of thechassis 10 and is disposed with space and in substantially parallel oppositely to the bottom. Thismotherboard 30 is disposed at the back side of thekeyboard 11 and provided over an area approximately half the size of thechassis 10. - The
centrifugal fan 31 is disposed in the far left corner of thechassis 10. Thecentrifugal fan 31 cools themotherboard 30 via aheat pipe 31 a and exhausts air in thechassis 10 to the outside through theair exhaust ports 14. It is to be noted that air intake ports or gaps (not shown) for taking in outside air into thechassis 10 are formed in theupper face 10 a or a bottom face etc. of thechassis 10. -
FIG. 2 is a perspective view of acentrifugal fan 31 according to an embodiment of the present invention.FIG. 3 is a top cross-sectional view of acentrifugal fan 31 according to an embodiment of the present invention.FIG. 4 is a cross-sectional view along an arrow I-I inFIG. 3 . - As illustrated in
FIG. 2 , apressing member 33 is attached to theheat pipe 31 a extending from thecentrifugal fan 31. The pressingmember 33 presses theheat pipe 31 a against a heat generation component (for example, CPU) of themotherboard 30. Theheat pipe 31 a is thermally connected to radiatingfins 34 provided in anair exhaust port 50 b of thecentrifugal fan 31 and transports the heat of the heat generation component to theradiating fins 34. - The
centrifugal fan 31 includes afan 40 rotating about a central axis O and afan casing 50 enclosing thefan 40. Anair intake port 50 a and theair exhaust port 50 b are formed in thefan casing 50. Theair intake port 50 a is opened in an axial direction in which the central axis O of thefan 40 extends, and theair exhaust port 50 b is opened in an orthogonal direction orthogonal to the axial direction. The above-described plurality of radiatingfins 34 are disposed in theair exhaust port 50 b. - The
fan casing 50 includes acover 51 enclosing an upper part of thefan 40 and aframe 52 enclosing a lower part of thefan 40. The above-describedair intake port 50 a is formed in thecover 51. In addition, a plurality ofair intake ports 50 a are also formed in theframe 52 as illustrated inFIG. 3 , and air is taken in from upper and lower faces of thefan casing 50. - The
fan 40 includes ahub 41 rotating about a central axis O and a plurality ofblades 42 provided on an outer periphery of thehub 41. Thefan 40 according to the present embodiment includes aring plate 43 to which ends of the plurality ofblades 42 are annularly connected in a circumferential direction around the central axis O. Thesehub 41,blades 42, andring plate 43 are integrally formed of resin material. It is to be noted that at least one of thehub 41, theblades 42, and thering plate 43 may be formed of metallic material. - The
hub 41 is formed in a topped cylindrical shape and connected to a motor (not shown) fixed to theframe 52 of thefan casing 50. The plurality ofblades 42 are formed in a substantially S-shape when viewed from the axial direction in which the central axis O extends. This shape of theblades 42 makes noise relatively low even at time of high wind pressure. Such acentrifugal fan 31 is also referred to as a silent fan. - As shown in
FIG. 3 , atongue portion 54 close (i.e., functionally adjacent) to thefan 40 and aninner flow channel 55 going around thefan 40 from thetongue portion 54 to theair exhaust port 50 b are formed in thefan casing 50. Theinner flow channel 55 forms a scroll flow channel in which a clearance between thefan casing 50 and thefan 40 is narrowest at thetongue portion 54, and the clearance between thefan casing 50 and thefan 40 becomes gradually larger as it goes from thetongue portion 54 to a rotational direction (a direction shown by an arrow inFIG. 3 ) going around thefan 40. - The
cover 51 and theframe 52 are connected via connectingpins 53 on a blow-out (exhaust) side of theinner flow channel 55 opposite thetongue portion 54 on which side the clearance between thefan 40 and thefan casing 50 in theinner flow channel 55 becomes larger. It is to be noted that the blow-out side of theinner flow channel 55 refers, when a first straight line L1 connecting the central axis O and theair exhaust port 50 b in the shortest distance among orthogonal directions orthogonal to the central axis O is regarded as a border line, to a side of theinner flow channel 55 opposite the side where thetongue portion 54 is disposed across the first straight line L1 (that is, it refers to a side of the page lower than the first straight line L1 inFIG. 3 ). - Protruding
portions 60 are protrusively provided on the blow-out side of theinner flow channel 55. The protrudingportions 60 are provided on thecover 51, of thecover 51 forming atop face 50 d (refer toFIG. 4 ) of thefan casing 50 and theframe 52 forming abottom face 50 e of thefan casing 50. In the present embodiment, thecover 51 is formed of a copper plate (metallic plate). In addition, theframe 52 is formed of a stainless steel plate (metallic plate). - As shown in
FIG. 3 , a plurality of (two in the present embodiment) protrudingportions 60 are provided with space in a main flow direction F on the blow-out side of theinner flow channel 55 when viewed from the axial direction. It is to be noted that the main flow direction F is a direction in which fluid flows straight toward theair exhaust port 50 b along an inner side face 50 c of thefan casing 50 on the blow-out side of theinner flow channel 55 and, in the present embodiment, is a direction parallel to the above-described first straight line L1. - In addition, the protruding
portion 60 assumes a triangular shape having a hypotenuse 61 extending in a direction of crossing the main flow direction F when viewed from the axial direction. The hypotenuse 61 makes an acute angle (for example, about 30° to 60°) with the main flow direction F. The radiatingfins 34 are disposed on an extension of the hypotenuse 61. The slope of the hypotenuse 61 may be such that the extension of the hypotenuse 61 heads toward the radiatingfins 34 disposed in the center of theair exhaust port 50 b. - In addition, the protruding
portions 60 are provided on theair exhaust port 50 b side from the central axis O in the main flow direction F when viewed from the axial direction. That is, the protrudingportions 60 are provided on a side of theinner flow channel 55 where theair exhaust port 50 b is disposed, when a second straight line L2 orthogonal to the above-described first straight line L1 among orthogonal directions orthogonal to the central axis O is regarded as a border line (that is, they are provided on the left side of the page from the second straight line L2 inFIG. 3 ). It is to be noted that the protrudingportions 60 are more preferably provided on theair exhaust port 50 b side from one third of a radius R of thefan 40, on theair exhaust port 50 b side of theinner flow channel 55. - Such protruding
portions 60 are formed by recessing a part of the cover 51 (copper plate) as shown inFIG. 2 andFIG. 4 . That is, the protrudingportions 60 are formed into a bottomed cylindrical shape with a part of thecover 51 recessed by press working. These protrudingportions 60 are formed at positions spaced from the inner side face 50 c of theinner flow channel 55 as shown inFIG. 3 . It is to be noted that the protrudingportions 60 may be formed by cutting and bending an edge of thecover 51 into a triangular shape as shown in a perspective view of a modified example shown inFIG. 5 , and a cross-sectional view of a modified example shown inFIG. 6 . - As shown in
FIG. 3 , thecentrifugal fan 31 structured above includes thefan 40 rotating about the central axis O and thefan casing 50 enclosing thefan 40 and having theair intake port 50 a formed in the axial direction in which the central axis O extends and theair exhaust port 50 b formed in the orthogonal direction orthogonal to the central axis O, the radiatingfins 34 being provided in theair exhaust port 50 b, thetongue portion 54 close to thefan 40 and theinner flow channel 55 going around thefan 40 from thetongue portion 54 to theair exhaust port 50 b are formed in thefan casing 50, thefan casing 50 has the cover 51 (metallic plate) forming thetop face 50 d facing in the axial direction, and the protrudingportions 60 projecting toward the blow-out side of theinner flow channel 55 opposite thetongue portion 54 are formed on thecover 51, which distributes the fluid flow in the main flow direction F toward theair exhaust port 50 b along the inner side face 50 c of thefan casing 50 and allows the fluid to hit against thewide radiating fins 34 provided in theair exhaust port 50 b. This can improve the cooling performance of thecentrifugal fan 31. - In addition, since the
cover 51 on which the protrudingportions 60 are formed, is a copper plate in the present embodiment, it has excellent thermal conductivity and good workability. Thus, the protrudingportion 60 can be easily formed by recessing a part of thecover 51 by press working etc. It is to be noted that no fluid leaks out from theinner flow channel 55 since forming the protrudingportion 60 by recessing does not form any gap or hole in thecover 51 in working compared to the protrudingportion 60 of the modified example (cutting and bending) shown inFIG. 5 . Thus, it is possible to prevent reduction in air flow of thecentrifugal fan 31. In addition, when theheat pipe 31 a is connected to theframe 52 as shown inFIG. 2 , the protrudingportions 60 can be easily formed while avoiding interference with theheat pipe 31 a by forming the protrudingportions 60 on thecover 51. - In addition, in the present embodiment, since the protruding
portion 60 assumes a triangular shape having the hypotenuse 61 extending in a direction of crossing the main flow direction F on the blow-out side of theinner flow channel 55 when viewed from the axial direction as shown inFIG. 3 , the fluid flow in the main flow direction F can be smoothly distributed toward the radiatingfins 34 provided in the center of theair exhaust port 50 b. In addition, since the protrudingportions 60 are formed at positions spaced from the inner side face 50 c of theinner flow channel 55, the original fluid flow in the main flow direction F cannot be blocked. -
FIG. 7 is a diagram showing a relationship between the number of protrudingportions 60 and cooling performance of thecentrifugal fan 31 according to an embodiment of the present invention. In the drawing, it is shown that the performance becomes higher in order of “Fair,” “Good,” and “Excellent.” It is to be noted that “ONE PROTRUDING PORTION” indicates the case where the protrudingportion 60 is provided only at a position indicated by a symbol (B) inFIG. 3 , “TWO PROTRUDING PORTIONS” indicates the case where the protrudingportions 60 are provided at positions indicated by a symbol (A) and the symbol (B) inFIG. 3 , and “THREE PROTRUDING PORTIONS” indicates the case where the protrudingportions 60 are provided at positions indicated by the symbol (A), the symbol (B), and a symbol (C) inFIG. 3 . - Two (performance “Excellent”) or three (performance “Good”) protruding
portions 60 are more preferable in performance than one protruding portion 60 (performance “Fair”) as shown inFIG. 7 . That is, it is found that provision of two or three protrudingportions 60 allows the fluid flow in the main flow direction F to be fully distributed. Thus, it is preferable, as shown inFIG. 3 , that the plurality of protrudingportions 60 are provided with space in the main flow direction F on the blow-out side of theinner flow channel 55 when viewed from the axial direction. - In addition, two protruding portions 60 (performance “Excellent”) are more preferable in performance than three protruding portions 60 (performance “Good”). This is thought to be because the protruding
portion 60 at the position indicated by the symbol (C) inFIG. 3 is located at substantially the same position as the central axis O in the main flow direction F. That is, it is thought that the fluid is still in a swirling state in theinner flow channel 55 at the position indicated by the symbol (C), and after the fluid came into collision with the hypotenuse 61 of the protrudingportion 60 at an angle, the flow rate of the fluid dropped and the distribution function by the hypotenuse 61 was reduced. Thus, it is preferable, as shown inFIG. 3 , that the protrudingportions 60 are provided on theair exhaust port 50 b side from the central axis O in the main flow direction F on the blow-out side of theinner flow channel 55 when viewed from the axial direction. More preferably, it is more preferable that the protrudingportions 60 are provided on theair exhaust port 50 b side from one third of the radius R of thefan 40 on which side the fluid flows straight along the inner side face 50 c of theinner flow channel 55, on theair exhaust port 50 b side from the central axis O. - Although the embodiments of this invention have been described in detail with reference to the drawings, specific structures are not limited to the above-described embodiments and design etc. without departing from the scope of this invention is also included. Each structure described in the above-described embodiments can be optionally combined unless they are inconsistent with each other.
- Although the embodiment of forming the protruding
portions 60 on thecover 51 forming thetop face 50 d is illustrated by an example in the above-described embodiments, for example, the protrudingportions 60 may be formed on theframe 52 forming thebottom face 50 e. In addition, the protrudingportions 60 may be formed on both thecover 51 and theframe 52. - Furthermore, when the
fan casing 50 intakes the fluid from its top and bottom parts as the present embodiment, the protrudingportions 60 may be provided on a part whose fluid intake amount is smaller (that is, the part opposed to a part whose fluid intake amount is larger (thecover 51 or the frame 52)). - Moreover, although the above-described embodiments have been described using a Laptop Personal Computer as one example of an electronic device, for example, the present invention is not limited thereto but may be applied to other electronic devices such as a tablet.
Claims (8)
1. A centrifugal fan, comprising:
a fan rotatable about a central axis; and
a fan casing enclosing the fan and having an air intake port in an axial direction in which the central axis extends and an air exhaust port in an orthogonal direction orthogonal to the central axis, and radiating fins in the air exhaust port,
wherein a tongue portion functionally adjacent to the fan, and an inner flow channel going around the fan from the tongue portion to the air exhaust port, are in the fan casing, and
the fan casing has:
a metallic plate having at least one of a top face and a bottom face facing each other in the axial direction; and
a protruding portion on the metallic plate and projecting toward a blow-out side of the inner flow channel opposite the tongue portion.
2. The centrifugal fan according to claim 1 , wherein the metallic plate is a copper plate.
3. The centrifugal fan according to claim 1 , wherein the protruding portion is formed by recessing a part of the metallic plate.
4. The centrifugal fan according to claim 1 ,
wherein the protruding portion has a triangular shape having a hypotenuse extending in a direction of crossing a main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
5. The centrifugal fan according to claim 1 ,
wherein a plurality of the protruding portions are spaced apart in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
6. The centrifugal fan according to claim 1 ,
wherein the protruding portion is on the air exhaust port side from the central axis in the main flow direction on the blow-out side of the inner flow channel when viewed from the axial direction.
7. The centrifugal fan according to claim 1 ,
wherein the protruding portion is on one of the top face and the bottom face, and
a heat pipe connected to the radiating fins is on the other of the top face and the bottom face.
8. An electronic device comprising:
a centrifugal fan including:
a fan rotatable about a central axis; and
a fan casing enclosing the fan and having an air intake port in an axial direction in which the central axis extends and an air exhaust port in an orthogonal direction orthogonal to the central axis, and radiating fins in the air exhaust port,
wherein a tongue portion functionally adjacent to the fan, and an inner flow channel going around the fan from the tongue portion to the air exhaust port, are in the fan casing, and
the fan casing has:
a metallic plate having at least one of a top face and a bottom face facing each other in the axial direction; and
a protruding portion on the metallic plate and projecting toward a blow-out side of the inner flow channel opposite the tongue portion.
Applications Claiming Priority (2)
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JP2019090984 | 2019-05-13 | ||
JP2019090984A JP7279501B2 (en) | 2019-05-13 | 2019-05-13 | Fly ash processing device and fly ash processing method |
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US20200362880A1 true US20200362880A1 (en) | 2020-11-19 |
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ID=73222555
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US16/557,473 Abandoned US20200362880A1 (en) | 2019-05-13 | 2019-08-30 | Centrifugal fan and electronic device |
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JP (1) | JP7279501B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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US20220369512A1 (en) * | 2021-05-12 | 2022-11-17 | Lenovo (Singapore) Pte. Ltd. | Electronic apparatus, cooling device, and method for manufacturing cooling device |
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JP3460570B2 (en) * | 1997-04-07 | 2003-10-27 | Jfeスチール株式会社 | Method for determining proper amount of heavy metal stabilizer and method for treating chemicals in waste |
JP3969157B2 (en) | 2002-04-01 | 2007-09-05 | 栗田工業株式会社 | Method and apparatus for determining required amount of chelating heavy metal immobilizing agent |
JP3911541B2 (en) | 2003-01-09 | 2007-05-09 | Dowaエコシステム株式会社 | Fly ash treatment |
JP3979410B2 (en) | 2004-09-22 | 2007-09-19 | 栗田工業株式会社 | Method for determining dioxin decomposition effect and method for decomposing dioxins |
JP2011136275A (en) | 2009-12-28 | 2011-07-14 | Jfe Kankyo Corp | Method of treating industrial waste liquid |
JP5962722B2 (en) | 2014-08-29 | 2016-08-03 | 栗田工業株式会社 | Chelating agent addition amount determination device and chelating agent addition amount determination method |
-
2019
- 2019-05-13 JP JP2019090984A patent/JP7279501B2/en active Active
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Cited By (2)
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US20220369512A1 (en) * | 2021-05-12 | 2022-11-17 | Lenovo (Singapore) Pte. Ltd. | Electronic apparatus, cooling device, and method for manufacturing cooling device |
US11963333B2 (en) * | 2021-05-12 | 2024-04-16 | Lenovo (Singapore) Pte. Ltd. | Electronic apparatus, cooling device, and method for manufacturing cooling device |
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JP2020185523A (en) | 2020-11-19 |
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