US20190120238A1 - Slim Fan - Google Patents
Slim Fan Download PDFInfo
- Publication number
- US20190120238A1 US20190120238A1 US15/871,223 US201815871223A US2019120238A1 US 20190120238 A1 US20190120238 A1 US 20190120238A1 US 201815871223 A US201815871223 A US 201815871223A US 2019120238 A1 US2019120238 A1 US 2019120238A1
- Authority
- US
- United States
- Prior art keywords
- bottom board
- housing
- stator unit
- impeller
- fan
- 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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
- F04D25/0646—Details of the stator
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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
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/08—Centrifugal pumps
- F04D17/16—Centrifugal pumps for displacing without appreciable compression
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0653—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the motor having a plane air gap, e.g. disc-type
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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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/068—Mechanical details of the pump control unit
-
- 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
-
- 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
- F04D29/403—Casings; Connections of working fluid especially adapted for elastic fluid pumps
Definitions
- the present invention relates to a fan and, more particularly, to a slim fan.
- the housing 91 Since at least one electronic element 923 (such as a driving element) is mounted to a lower face of the circuit board 921 , the housing 91 requires a pad 913 annularly disposed around an outer periphery of the shaft tube 912 and connected to the bottom board 911 , such that the circuit board 921 abuts the pad 913 when the circuit board 921 is mounted around the shaft tube 912 . Furthermore, a gap G exists between the lower face of the circuit board 921 and the bottom board 911 for receiving the at least one electronic element 923 . Thus, it is difficult to further reduce the axial height of the fan 9 , and the structure of the housing 91 is complicated and is difficult to form.
- a slim fan according to the present invention includes a housing, an impeller, and a stator unit.
- the housing includes a bottom board.
- the bottom board includes an inner face and an outer face.
- the bottom board includes at least one receiving space located between the inner face and the outer face.
- An impeller is rotatably mounted in the housing.
- a stator unit is mounted in the housing.
- the stator unit includes a circuit board, a coil unit, and at least one electronic element.
- the coil unit and the at least one electronic element are mounted on the circuit board.
- the at least one electronic element extends into the at least one receiving space.
- the slim fan according to the present invention is simplified in the structure of the housing to further reduce the axial height of the slim fan and to increase the convenience of manufacturing the housing and assembly of the slim fan.
- each of a maximum axial height of the bottom board in an axial direction of the impeller and a maximum axial height of the stator unit in the axial direction of the impeller is not larger than 1.1 mm.
- the sum of the maximum axial height of the bottom board and the maximum axial height of the stator unit is larger than 1.1 mm. This can be applied in mini-type heat dissipating fan technique.
- the stator unit and the bottom board have an assembled axial height not larger than 1.1 mm. This can be applied in mini-type heat dissipating fan technique.
- the at least one receiving space is located within a maximum diametric range of the stator unit. This assures that the bottom board has a higher structural strength.
- the coil unit is formed on the circuit board by etching or electrocasting. This can further reduce the maximum axial height of the stator unit.
- the circuit board includes a plurality of grooves, and the coil unit extends into the plurality of grooves. This can reduce the maximum axial height of the stator unit.
- the at least one receiving space includes a through-hole extending through the bottom board. This increases the manufacturing convenience of the bottom board and is helpful in reducing the operating temperature of the at least one electronic element and the axial height of the fan.
- a diametric range of the first chamber in a diametric direction of the impeller is smaller than a diametric range of the second chamber in the diametric direction of the impeller. This increases the operational convenience while assembling the spacer.
- FIG. 2 is a diagrammatic, exploded, perspective view of a slim fan of a first embodiment according to the present invention.
- FIG. 4 is a diagrammatic, top view of the slim fan of the first embodiment according to the present invention before attachment of a cover.
- FIG. 5 is a diagrammatic, top view of a stator unit and a bottom board of the slim fan of the first embodiment according to the present invention.
- FIG. 6 is a cross sectional view of a slim fan of a second embodiment according to the present invention.
- FIG. 7 is a cross sectional view of a slim fan of a third embodiment according to the present invention.
- FIG. 8 is a cross sectional view of a slim fan of a fourth embodiment according to the present invention.
- FIG. 9 is a cross sectional view of a slim fan of a fifth embodiment according to the present invention.
- FIG. 2 shows a slim fan of a first embodiment according to the present invention.
- the slim fan is in the form of a blower type fan.
- the slim fan of this embodiment includes a housing 1 , an impeller 2 mounted in the housing 1 , and a stator unit 3 mounted in the housing 1 .
- the housing 1 is a hollow housing capable of introducing air into and out of the hollow housing.
- the housing 1 includes a bottom board 11 , a sidewall 12 , and a cover 13 .
- the bottom board 11 includes an inner face 11 a and an outer face 11 b .
- the sidewall 12 is coupled to the bottom board 11 .
- the cover 13 is connected to the sidewall 12 and faces the inner face 11 a of the bottom board 11 .
- a space for receiving other members is defined between the bottom board 11 , the sidewall 12 , and the cover 13 .
- the bottom board 11 includes at least one receiving space S located between the inner face 11 a and the outer face 11 b.
- the housing 1 includes a shaft coupling portion 14 mounted on the bottom board 11 and protruding from the inner face 11 a of the bottom board 11 .
- the shaft coupling portion 14 can be integrally formed with or detachably coupled to the bottom board 11 .
- the impeller 2 includes a shaft 21 , a hub 22 , a plurality of blades 23 , and a magnetic element 24 .
- the shaft 21 is connected to the hub 22 and is rotatably mounted to the shaft coupling portion 14 of the housing 1 .
- the plurality of blades 23 is annularly disposed on an outer periphery of the hub 22 .
- the magnetic element 24 is mounted to an inner periphery of the hub 22 .
- Each of the plurality of blades 23 includes an inner edge 231 and an outer edge 232 .
- a blade rotational range R (see FIG. 4 ) is formed between the inner edges 231 and the outer edges 232 of the plurality of blades 23 .
- the stator unit 3 includes a circuit board 31 , a coil unit 32 , and at least one electronic element 33 (such as a driving element or a sensor element).
- the coil unit 32 and the at least one electronic element 33 are mounted on the circuit board 31 .
- the circuit board 31 can be mounted around the shaft coupling portion 14 .
- the coil unit 32 faces the magnetic element 24 .
- the at least one electronic element 33 extends into the at least one receiving space S of the bottom board 11 but does not protrude beyond the outer face 11 b of the bottom board 11 .
- all electronic elements 33 are received in the at least one receiving space S.
- the circuit board 31 includes a first surface 31 a and a second surface 31 b opposite to the first surface 31 a.
- the circuit board 31 can be coupled with the shaft coupling portion 14 by press fitting, and the first surface 31 a of the circuit board 31 abuts the inner face 11 a of the bottom board 11 of the housing 1 .
- the circuit board 31 is mounted around the shaft coupling portion 14 by loose fitting, and the first surface 31 a of the circuit board 31 is bonded to the inner face 11 a of the bottom board 11 of the housing 1 by an adhesive (such as a gum or a glue) or hot melting.
- an adhesive such as a gum or a glue
- the circuit board 31 can be directly bonded to the inner face 11 a of the circuit board 11 by the inner surface 11 a.
- an insulating plate (not shown) can be disposed on the first surface 31 a of the circuit board 31 , and the circuit board 31 can be indirectly bonded to the inner face 11 a of the bottom board 11 via the insulating plate.
- the at least one electronic element 33 of the stator unit 3 extends into the at least one receiving space S of the bottom board 11 but does not protrude beyond the outer face 11 b of the bottom board 11 , such that the assembled axial height H 1 can be smaller than the sum of the maximum axial height hl of the bottom board 11 and the maximum axial height h 2 of the stator unit 3 .
- the maximum axial height H 2 of the overall slim fan is reduced while simplifying the structure of the housing 1 (without the need of the pad in the prior art).
- the overall slim fan is more light and more thin and is easy to manufacture and assemble.
- the slim fan according to the present invention can be used in the heat dissipating technique in which the sum of the maximum axial height h 1 and the maximum axial height h 2 is larger than 1.1 mm and in which the assembled axial height H 1 is preferably not larger than 1.1 mm.
- the stator unit 3 is not located within the blade rotational range R in the axial direction of the impeller 2 , such that the plurality of blades 23 of the impeller 2 can be closer to the inner surface 11 a of the bottom board 11 , which is helpful in reducing the maximum axial height 112 of the overall slim fan. Furthermore, damage to the stator unit 3 resulting from collision with the plurality of blades 23 can be effectively avoided.
- the at least one receiving space S can include a through-hole extending through the bottom board 11 to increase the manufacturing convenience of the bottom board 11 . Furthermore, a portion of the air currents can flow through the at least one receiving space S into the housing 1 during rotation of the impeller 2 and can directly flow toward the at least one electronic element 33 of the stator unit 3 .
- the at least one receiving space S can be located within a maximum diametric range of the stator unit 3 , assuring that the bottom board 11 can have a higher structural strength.
- FIG. 6 shows a slim fan of a second embodiment according to the present invention.
- the second embodiment according to the present invention is substantially the same as the first embodiment except for the at least one receiving space S.
- the at least one receiving space S is still in the form of a through-hole extending through the bottom board 11 . Nevertheless, the at least one receiving space S includes a first chamber S 1 and a second chamber S 2 communicating with the first chamber S 1 .
- the first chamber S 1 is adjacent to the inner face 11 a of the bottom board 11
- the second chamber S 2 is adjacent to the outer face 11 b of the bottom board 11 .
- a diametric range of the first chamber S 1 in a diametric direction of the impeller 2 is smaller than a diametric range of the second chamber S 2 in the diametric direction of the impeller 2 .
- the at least one electronic element 33 of the stator unit 3 extends into the first chamber S 1 .
- the slim fan further includes a spacer 4 mounted in the second chamber S 2 .
- the spacer 4 can be a label and preferably does not protrude beyond the outer face 11 b of the bottom board 11 , such that the slim fan provides an identifying effect without increasing the maximum axial height H 2 of the overall slim fan while avoiding exposure of the at least one electronic element 33 .
- FIG. 7 shows a slim fan of a third embodiment according to the present invention.
- the third embodiment according to the present invention is substantially the same as the first embodiment except that the at least one receiving space S of the third embodiment is a blind hole in the bottom board 11 , such that the bottom board 11 has a better structural strength and is less likely to deform.
- FIG. 8 shows a slim fan of a fourth embodiment according to the present invention.
- the fourth embodiment according to the present invention is substantially the same as the first embodiment except that the coil unit 32 of the stator unit 3 of the fourth embodiment can be of a coreless winding type or a type having silicon steel plates with windings. Since the coil unit 32 of these types has a larger axial height, the circuit board 31 of the stator unit 3 can include a plurality of grooves 311 , and the coil unit 32 can extend into the plurality of grooves 311 . Alternatively, a portion of the electronic elements 33 can be received in the plurality of grooves 311 to reduce the maximum axial height h 2 .
- FIG. 9 shows a slim fan of a fifth embodiment according to the present invention.
- This embodiment shows a slim fan according to the present invention in the form of an axial flow type fan.
- the slim fan of this embodiment includes a housing 5 , an impeller 6 mounted in the housing 5 , and a stator unit 7 mounted in the housing 5 .
- the housing 5 includes a bottom board 51 , a sidewall 52 , and a plurality of ribs 53 .
- the bottom board 51 includes an inner face 51 a and an outer face 51 b opposite to the inner face 51 a.
- the bottom board 51 is mounted inside the sidewall 52 .
- the plurality of ribs 53 connects the bottom board 51 to the sidewall 52 .
- the bottom board 51 includes at least one receiving space S located between the inner face 51 a and the outer face 51 b.
- the housing 5 includes a shaft coupling portion 54 mounted on the bottom board 51 and protruding from the inner face 51 a of the bottom board 51 .
- the impeller 6 includes a shaft 61 , a hub 62 , a plurality of blades 63 , and a magnetic element 64 .
- the shaft 61 is connected to the hub 62 and is rotatably mounted to the shaft coupling portion 54 of the housing 5 .
- the plurality of blades 63 is annularly disposed on an outer periphery of the hub 62 .
- the magnetic element 64 is mounted to an inner periphery of the hub 62 .
- the stator unit 7 includes a circuit board 71 , a coil unit 72 , and at least one electronic element 73 (such as a driving element or a sensor element).
- the coil unit 72 and the at least one electronic element 73 are mounted on the circuit board 71 .
- the circuit board 71 can be mounted around the shaft coupling portion 54 .
- the coil unit 72 faces the magnetic element 64 .
- the at least one electronic element 73 extends into the at least one receiving space S of the bottom board 51 but does not protrude beyond the outer face 51 b of the bottom board 51 .
- the housing 5 further includes a limiting portion 55 on the inner face 51 a of the bottom board 51 , such that the circuit board 71 mounted around the shaft coupling portion 54 can be restrained within the limiting portion 55 . Nevertheless, the maximum axial height hl of the bottom board 51 does not include the thickness of the limiting portion 55 .
- the slim fan according to the present invention is simplified in the structure of the housing 1 , 5 to further reduce the axial height of the slim fan and to increase the convenience of manufacturing the housing 1 , 5 and assembly of the slim fan.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A slim fan includes a housing, an impeller, and a stator unit. The housing includes a bottom board. The bottom board includes an inner face and an outer face. The bottom board includes at least one receiving space located between the inner face and the outer face. An impeller is rotatably mounted in the housing. A stator unit is mounted in the housing. The stator unit includes a circuit board, a coil unit, and at least one electronic element. The coil unit and the at least one electronic element are mounted on the circuit board. The at least one electronic element extends into the at least one receiving space.
Description
- The application claims the benefit of Taiwan application serial No. 106136539, filed on Oct. 24, 2017, and the entire contents of which are incorporated herein by reference.
- The present invention relates to a fan and, more particularly, to a slim fan.
- Generally, since electronic elements in electronic products generate heat during operation, many electronic products are equipped with heat dissipating fans for a long time. The heat dissipating fans provide a wind driving function to force air currents to flow for expelling the high temperature air inside the electronic products, increasing the heat dissipating efficiency during operation of the electronic products and thereby maintaining stable operation of the electronic products.
- However, with the developing demands of thinning and high performances of electronic products, “thinning” is another aim in addition to fulfilling the heat dissipating demand of electronic products. Thus, the developing trends of many electronic products in recent years focus on how to reduce the axial height of the heat dissipating fans. Current heat dissipating fans generally include a housing, a stator unit mounted in the housing, and an impeller rotatably mounted in the housing. When it is desired to reduce the axial height of the overall heat dissipating fan, most designs aim in improvement to the structure of the stator unit.
- With reference to
FIG. 1 , as an example, a conventionalthin fan 9 includes ahousing 91, astator unit 92, and animpeller 93. Thehousing 91 includes abottom board 911 and ashaft tube 912 connected to thebottom board 911. Thestator unit 92 includes acircuit board 921 mounted around theshaft tube 912. Thestator unit 92 further includes a plurality ofcoils 922 formed by windings. Thecoils 922 are mounted on and electrically connected to thecircuit board 921. Theimpeller 93 includes ashaft 931 rotatably mounted in theshaft tube 912. Theimpeller 93 further includes amagnetic element 932 aligned with thecoils 922. An embodiment similar to thethin fan 9 is disclosed in Taiwan Patent No. 1342098 entitled “Motor.” - Since at least one electronic element 923 (such as a driving element) is mounted to a lower face of the
circuit board 921, thehousing 91 requires apad 913 annularly disposed around an outer periphery of theshaft tube 912 and connected to thebottom board 911, such that thecircuit board 921 abuts thepad 913 when thecircuit board 921 is mounted around theshaft tube 912. Furthermore, a gap G exists between the lower face of thecircuit board 921 and thebottom board 911 for receiving the at least oneelectronic element 923. Thus, it is difficult to further reduce the axial height of thefan 9, and the structure of thehousing 91 is complicated and is difficult to form. - Thus, improvement to the conventional thin fans is necessary.
- To solve the above problems, the present invention provides a slim fan that is simplified in the structure of a housing to further reduce the axial height of the slim fan.
- The present invention provides a slim fan to simplify the structure of the housing thereof to thereby increase convenience in manufacture of the housing and assembly of the slim fan.
- When the terms “top”, “bottom”, “inner”, “outer”, “side”, and similar terms are used herein, it should be understood that these terms have reference only to the structure shown in the drawings as it would appear to a person viewing the drawings and are utilized only to facilitate describing the invention, rather than restricting the invention.
- A slim fan according to the present invention includes a housing, an impeller, and a stator unit. The housing includes a bottom board. The bottom board includes an inner face and an outer face. The bottom board includes at least one receiving space located between the inner face and the outer face. An impeller is rotatably mounted in the housing. A stator unit is mounted in the housing. The stator unit includes a circuit board, a coil unit, and at least one electronic element. The coil unit and the at least one electronic element are mounted on the circuit board. The at least one electronic element extends into the at least one receiving space.
- Thus, the slim fan according to the present invention is simplified in the structure of the housing to further reduce the axial height of the slim fan and to increase the convenience of manufacturing the housing and assembly of the slim fan.
- In an example, before the stator unit and the housing are assembled, each of a maximum axial height of the bottom board in an axial direction of the impeller and a maximum axial height of the stator unit in the axial direction of the impeller is not larger than 1.1 mm. The sum of the maximum axial height of the bottom board and the maximum axial height of the stator unit is larger than 1.1 mm. This can be applied in mini-type heat dissipating fan technique.
- In an example, after the stator unit and the housing are assembled, the stator unit and the bottom board have an assembled axial height not larger than 1.1 mm. This can be applied in mini-type heat dissipating fan technique.
- In an example, the at least one receiving space is located within a maximum diametric range of the stator unit. This assures that the bottom board has a higher structural strength.
- In an example, the coil unit is formed on the circuit board by etching or electrocasting. This can further reduce the maximum axial height of the stator unit.
- In an example, the circuit board includes a plurality of grooves, and the coil unit extends into the plurality of grooves. This can reduce the maximum axial height of the stator unit.
- In an example, the at least one receiving space includes a through-hole extending through the bottom board. This increases the manufacturing convenience of the bottom board and is helpful in reducing the operating temperature of the at least one electronic element and the axial height of the fan.
- In an example, the at least one receiving space includes a first chamber and a second chamber, the at least one electronic element extends into the first chamber, and a spacer is mounted in the second chamber. This reduces the axial height and avoid exposure of the at least one electronic element.
- In an example, a diametric range of the first chamber in a diametric direction of the impeller is smaller than a diametric range of the second chamber in the diametric direction of the impeller. This increases the operational convenience while assembling the spacer.
- In an example, the spacer does not protrude beyond the outer face of the bottom board. This avoids an increase in the maximum axial height of the overall slim fan.
- In an example, the at least one receiving space includes a blind hole in the bottom board. Thus, the bottom board has a better structural strength and is less likely to deform.
- In an example, the impeller includes a hub and a plurality of blades. The plurality of blades is annularly disposed on an outer periphery of the hub. Each of the plurality of blades includes an inner edge and an outer edge. A blade rotational range is formed between the inner edges and the outer edges of the plurality of blades. The stator unit is not located within the blade rotational range in an axial direction of the impeller. Thus, the maximum axial height of the overall slim fan can be reduced while effectively avoiding damage to the stator unit resulting from collision with the plurality of blades.
- The present invention will become clearer in light of the following detailed description of illustrative embodiments of this invention described in connection with the drawings.
-
FIG. 1 is a diagrammatic cross sectional view of a conventional thin fan. -
FIG. 2 is a diagrammatic, exploded, perspective view of a slim fan of a first embodiment according to the present invention. -
FIG. 3 is a diagrammatic cross sectional view of the slim fan of the first embodiment according to the present invention. -
FIG. 4 is a diagrammatic, top view of the slim fan of the first embodiment according to the present invention before attachment of a cover. -
FIG. 5 is a diagrammatic, top view of a stator unit and a bottom board of the slim fan of the first embodiment according to the present invention. -
FIG. 6 is a cross sectional view of a slim fan of a second embodiment according to the present invention. -
FIG. 7 is a cross sectional view of a slim fan of a third embodiment according to the present invention. -
FIG. 8 is a cross sectional view of a slim fan of a fourth embodiment according to the present invention. -
FIG. 9 is a cross sectional view of a slim fan of a fifth embodiment according to the present invention. -
FIG. 2 shows a slim fan of a first embodiment according to the present invention. In this non-restrictive embodiment, the slim fan is in the form of a blower type fan. The slim fan of this embodiment includes ahousing 1, animpeller 2 mounted in thehousing 1, and astator unit 3 mounted in thehousing 1. - With reference to
FIGS. 2 and 3 , thehousing 1 is a hollow housing capable of introducing air into and out of the hollow housing. In this embodiment, thehousing 1 includes abottom board 11, asidewall 12, and acover 13. Thebottom board 11 includes aninner face 11 a and anouter face 11 b. Thesidewall 12 is coupled to thebottom board 11. Thecover 13 is connected to thesidewall 12 and faces theinner face 11 a of thebottom board 11. Thus, a space for receiving other members is defined between thebottom board 11, thesidewall 12, and thecover 13. Thebottom board 11 includes at least one receiving space S located between theinner face 11 a and theouter face 11 b. Furthermore, thehousing 1 includes ashaft coupling portion 14 mounted on thebottom board 11 and protruding from theinner face 11 a of thebottom board 11. Theshaft coupling portion 14 can be integrally formed with or detachably coupled to thebottom board 11. - The
impeller 2 includes ashaft 21, ahub 22, a plurality ofblades 23, and amagnetic element 24. Theshaft 21 is connected to thehub 22 and is rotatably mounted to theshaft coupling portion 14 of thehousing 1. The plurality ofblades 23 is annularly disposed on an outer periphery of thehub 22. Themagnetic element 24 is mounted to an inner periphery of thehub 22. Each of the plurality ofblades 23 includes aninner edge 231 and anouter edge 232. A blade rotational range R (seeFIG. 4 ) is formed between theinner edges 231 and theouter edges 232 of the plurality ofblades 23. - The
stator unit 3 includes acircuit board 31, acoil unit 32, and at least one electronic element 33 (such as a driving element or a sensor element). Thecoil unit 32 and the at least oneelectronic element 33 are mounted on thecircuit board 31. Thecircuit board 31 can be mounted around theshaft coupling portion 14. Thecoil unit 32 faces themagnetic element 24. The at least oneelectronic element 33 extends into the at least one receiving space S of thebottom board 11 but does not protrude beyond theouter face 11 b of thebottom board 11. Preferably, allelectronic elements 33 are received in the at least one receiving space S. - Specifically, the
circuit board 31 includes afirst surface 31 a and asecond surface 31 b opposite to thefirst surface 31 a. Thecircuit board 31 can be coupled with theshaft coupling portion 14 by press fitting, and thefirst surface 31 a of thecircuit board 31 abuts theinner face 11 a of thebottom board 11 of thehousing 1. Alternatively, thecircuit board 31 is mounted around theshaft coupling portion 14 by loose fitting, and thefirst surface 31 a of thecircuit board 31 is bonded to theinner face 11 a of thebottom board 11 of thehousing 1 by an adhesive (such as a gum or a glue) or hot melting. In a case that thebottom board 11 of thehousing 1 is made of an insulating material, thecircuit board 31 can be directly bonded to theinner face 11 a of thecircuit board 11 by theinner surface 11 a. In another case that thebottom board 11 of thehousing 1 is made of a non-insulating material, an insulating plate (not shown) can be disposed on thefirst surface 31 a of thecircuit board 31, and thecircuit board 31 can be indirectly bonded to theinner face 11 a of thebottom board 11 via the insulating plate. - It is noted that before the
stator unit 3 and thehousing 1 are assembled, thebottom board 11 has a maximum axial height h1 in an axial direction of theimpeller 2, and the maximum axial height h1 of thebottom board 11 in the axial direction of theimpeller 2 is not larger than 1.1 mm. Furthermore, the stator unit 3 (the overall height of a combination including thecircuit board 31, thecoil unit 32, and the at least one electronic element 33) includes a maximum axial height h2 in the axial direction of theimpeller 2, and the maximum axial height h2 of thestator unit 3 in the axial direction of theimpeller 2 is not larger than 1.1 mm. Furthermore, after thestator unit 3 and thehousing 1 are assembled, thestator unit 3 and thebottom board 11 have an assembled axial height H1 not larger than 1.1 mm. - After assembly of the slim fan according to the present invention, the at least one
electronic element 33 of thestator unit 3 extends into the at least one receiving space S of thebottom board 11 but does not protrude beyond theouter face 11 b of thebottom board 11, such that the assembled axial height H1 can be smaller than the sum of the maximum axial height hl of thebottom board 11 and the maximum axial height h2 of thestator unit 3. Thus, the maximum axial height H2 of the overall slim fan is reduced while simplifying the structure of the housing 1 (without the need of the pad in the prior art). The overall slim fan is more light and more thin and is easy to manufacture and assemble. As a result, the slim fan according to the present invention can be used in the heat dissipating technique in which the sum of the maximum axial height h1 and the maximum axial height h2 is larger than 1.1 mm and in which the assembled axial height H1 is preferably not larger than 1.1 mm. - Furthermore, with reference to
FIGS. 3 and 4 , thestator unit 3 is not located within the blade rotational range R in the axial direction of theimpeller 2, such that the plurality ofblades 23 of theimpeller 2 can be closer to theinner surface 11 a of thebottom board 11, which is helpful in reducing the maximum axial height 112 of the overall slim fan. Furthermore, damage to thestator unit 3 resulting from collision with the plurality ofblades 23 can be effectively avoided. - Furthermore, in a non-restrictive example, the at least one receiving space S can include a through-hole extending through the
bottom board 11 to increase the manufacturing convenience of thebottom board 11. Furthermore, a portion of the air currents can flow through the at least one receiving space S into thehousing 1 during rotation of theimpeller 2 and can directly flow toward the at least oneelectronic element 33 of thestator unit 3. - Thus, the operating temperature of the at least one
electronic element 33 and the axial height of the fan can be reduced. Thecoil unit 32 of thestator 3 can be formed on thecircuit board 31 by etching or electrocasting to further reduce the maximum axial height h2 of thestator unit 3. - Furthermore, with reference to
FIGS. 3 and 5 , the at least one receiving space S can be located within a maximum diametric range of thestator unit 3, assuring that thebottom board 11 can have a higher structural strength. -
FIG. 6 shows a slim fan of a second embodiment according to the present invention. The second embodiment according to the present invention is substantially the same as the first embodiment except for the at least one receiving space S. - Specifically, in this embodiment, the at least one receiving space S is still in the form of a through-hole extending through the
bottom board 11. Nevertheless, the at least one receiving space S includes a first chamber S1 and a second chamber S2 communicating with the first chamber S1. The first chamber S1 is adjacent to theinner face 11 a of thebottom board 11, and the second chamber S2 is adjacent to theouter face 11 b of thebottom board 11. A diametric range of the first chamber S1 in a diametric direction of theimpeller 2 is smaller than a diametric range of the second chamber S2 in the diametric direction of theimpeller 2. The at least oneelectronic element 33 of thestator unit 3 extends into the first chamber S1. The slim fan further includes aspacer 4 mounted in the second chamber S2. Thespacer 4 can be a label and preferably does not protrude beyond theouter face 11 b of thebottom board 11, such that the slim fan provides an identifying effect without increasing the maximum axial height H2 of the overall slim fan while avoiding exposure of the at least oneelectronic element 33. -
FIG. 7 shows a slim fan of a third embodiment according to the present invention. The third embodiment according to the present invention is substantially the same as the first embodiment except that the at least one receiving space S of the third embodiment is a blind hole in thebottom board 11, such that thebottom board 11 has a better structural strength and is less likely to deform. -
FIG. 8 shows a slim fan of a fourth embodiment according to the present invention. The fourth embodiment according to the present invention is substantially the same as the first embodiment except that thecoil unit 32 of thestator unit 3 of the fourth embodiment can be of a coreless winding type or a type having silicon steel plates with windings. Since thecoil unit 32 of these types has a larger axial height, thecircuit board 31 of thestator unit 3 can include a plurality ofgrooves 311, and thecoil unit 32 can extend into the plurality ofgrooves 311. Alternatively, a portion of theelectronic elements 33 can be received in the plurality ofgrooves 311 to reduce the maximum axial height h2. -
FIG. 9 shows a slim fan of a fifth embodiment according to the present invention. This embodiment shows a slim fan according to the present invention in the form of an axial flow type fan. Specifically, the slim fan of this embodiment includes a housing 5, animpeller 6 mounted in the housing 5, and astator unit 7 mounted in the housing 5. - The housing 5 includes a
bottom board 51, asidewall 52, and a plurality ofribs 53. Thebottom board 51 includes aninner face 51 a and anouter face 51 b opposite to theinner face 51 a. Thebottom board 51 is mounted inside thesidewall 52. The plurality ofribs 53 connects thebottom board 51 to thesidewall 52. Thebottom board 51 includes at least one receiving space S located between theinner face 51 a and theouter face 51 b. Furthermore, the housing 5 includes ashaft coupling portion 54 mounted on thebottom board 51 and protruding from theinner face 51 a of thebottom board 51. - The
impeller 6 includes ashaft 61, ahub 62, a plurality ofblades 63, and amagnetic element 64. Theshaft 61 is connected to thehub 62 and is rotatably mounted to theshaft coupling portion 54 of the housing 5. The plurality ofblades 63 is annularly disposed on an outer periphery of thehub 62. Themagnetic element 64 is mounted to an inner periphery of thehub 62. - The
stator unit 7 includes acircuit board 71, acoil unit 72, and at least one electronic element 73 (such as a driving element or a sensor element). Thecoil unit 72 and the at least oneelectronic element 73 are mounted on thecircuit board 71. Thecircuit board 71 can be mounted around theshaft coupling portion 54. Thecoil unit 72 faces themagnetic element 64. The at least oneelectronic element 73 extends into the at least one receiving space S of thebottom board 51 but does not protrude beyond theouter face 51 b of thebottom board 51. - It is noted that, in this embodiment, the housing 5 further includes a limiting
portion 55 on theinner face 51 a of thebottom board 51, such that thecircuit board 71 mounted around theshaft coupling portion 54 can be restrained within the limitingportion 55. Nevertheless, the maximum axial height hl of thebottom board 51 does not include the thickness of the limitingportion 55. - By the arrangement of the above structure, after assembly of the slim fan of this embodiment, the at least one
electronic element 73 of thestator unit 7 extends into the at least one receiving space S of thebottom board 51 of the housing 5 but does not protrude beyond theouter face 51 b of thebottom board 51, such that the assembled axial height H1 of thestator unit 7 and thebottom board 51 can be smaller than the sum of the maximum axial height hl of thebottom board 51 and the maximum axial height h2 of thestator unit 7, thereby reducing the maximum axial height H2 of the overall slim fan. - In view of the foregoing, the slim fan according to the present invention is simplified in the structure of the
housing 1, 5 to further reduce the axial height of the slim fan and to increase the convenience of manufacturing thehousing 1, 5 and assembly of the slim fan. - Although the invention has been described in detail with reference to its presently preferable embodiments, it will be understood by one of ordinary skill in the art that various modifications can be made without departing from the spirit and the scope of the invention, as set forth in the appended claims.
Claims (12)
1. A slim fan comprising:
a housing including a bottom board, wherein the bottom board includes an inner face and an outer face, wherein the bottom board includes at least one receiving space located between the inner face and the outer face;
an impeller rotatably mounted in the housing; and
a stator unit mounted in the housing, wherein the stator unit includes a circuit board, a coil unit, and at least one electronic element, wherein the coil unit and the at least one electronic element are mounted on the circuit board, and wherein the at least one electronic element extends into the at least one receiving space.
2. The slim fan as claimed in claim 1 , wherein before the stator unit and the housing are assembled, each of a maximum axial height of the bottom board in an axial direction of the impeller and a maximum axial height of the stator unit in the axial direction of the impeller is not larger than 1.1 mm, and wherein a sum of the maximum axial height of the bottom board and the maximum axial height of the stator unit is larger than 1.1 mm.
3. The slim fan as claimed in claim 2 , wherein after the stator unit and the housing are assembled, the stator unit and the bottom board have an assembled axial height not larger than 1.1 mm.
4. The slim fan as claimed in claim 1 , wherein the at least one receiving space is located within a maximum diametric range of the stator unit.
5. The slim fan as claimed in claim 1 , wherein the coil unit is formed on the circuit board by etching or electrocasting.
6. The slim fan as claimed in claim 1 , wherein the circuit board includes a plurality of grooves, and wherein the coil unit extends into the plurality of grooves.
7. The slim fan as claimed in claim 1 , wherein the at least one receiving space includes a through-hole extending through the bottom board.
8. The slim fan as claimed in claim 7 , wherein the at least one receiving space includes a first chamber and a second chamber, wherein the at least one electronic element extends into the first chamber, and wherein a spacer is mounted in the second chamber.
9. The slim fan as claimed in claim 8 , wherein a diametric range of the first chamber in a diametric direction of the impeller is smaller than a diametric range of the second chamber in the diametric direction of the impeller.
10. The slim fan as claimed in claim 8 , wherein the spacer does not protrude beyond the outer face of the bottom board.
11. The slim fan as claimed in claim 1 , wherein the at least one receiving space includes a blind hole in the bottom board.
12. The slim fan as claimed in claim 1 , wherein the impeller includes a hub and a plurality of blades, wherein the plurality of blades is annularly disposed on an outer periphery of the hub, wherein each of the plurality of blades includes an inner edge and an outer edge, wherein a blade rotational range is formed between the inner edges and the outer edges of the plurality of blades, and wherein the stator unit is not located within the blade rotational range in an axial direction of the impeller.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW106136539 | 2017-10-24 | ||
TW106136539A TWI667411B (en) | 2017-10-24 | 2017-10-24 | Super thin fan |
Publications (1)
Publication Number | Publication Date |
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US20190120238A1 true US20190120238A1 (en) | 2019-04-25 |
Family
ID=66170483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US15/871,223 Abandoned US20190120238A1 (en) | 2017-10-24 | 2018-01-15 | Slim Fan |
Country Status (3)
Country | Link |
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US (1) | US20190120238A1 (en) |
CN (1) | CN109695582A (en) |
TW (1) | TWI667411B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10920790B2 (en) * | 2017-12-22 | 2021-02-16 | Delta Electronics, Inc. | Fan |
US10962017B2 (en) * | 2018-02-26 | 2021-03-30 | Nidec Corporation | Centrifugal fan |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2387532A1 (en) * | 1977-04-13 | 1978-11-10 | Etri Sa | ELECTRICAL SUPPLY SOCKET, ESPECIALLY FOR A FLAT TYPE FAN |
CN2307137Y (en) * | 1997-03-19 | 1999-02-10 | 洪陈富英 | Ultrathin centrifugal electric fan |
CN2426177Y (en) * | 2000-04-24 | 2001-04-04 | 元山科技工业股份有限公司 | Cooling fan |
JP4815906B2 (en) * | 2005-07-11 | 2011-11-16 | 日本電産株式会社 | Centrifugal fan |
JP2011135627A (en) * | 2009-12-22 | 2011-07-07 | Nippon Densan Corp | Motor |
CN203114668U (en) * | 2013-01-04 | 2013-08-07 | 建准电机工业股份有限公司 | Mini-type cooling fan and coil substrate thereof |
TWI467896B (en) * | 2013-01-24 | 2015-01-01 | Sunonwealth Electr Mach Ind Co | Motor with easy-starting structure and base thereof |
TWI521142B (en) * | 2013-12-31 | 2016-02-11 | 建準電機工業股份有限公司 | Miniature fan |
TWI549403B (en) * | 2015-01-28 | 2016-09-11 | 昆山廣興電子有限公司 | Metal base of motor |
-
2017
- 2017-10-24 TW TW106136539A patent/TWI667411B/en active
- 2017-11-01 CN CN201711057290.3A patent/CN109695582A/en active Pending
-
2018
- 2018-01-15 US US15/871,223 patent/US20190120238A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10920790B2 (en) * | 2017-12-22 | 2021-02-16 | Delta Electronics, Inc. | Fan |
US11209019B2 (en) | 2017-12-22 | 2021-12-28 | Delta Electronics, Inc. | Fan |
US10962017B2 (en) * | 2018-02-26 | 2021-03-30 | Nidec Corporation | Centrifugal fan |
Also Published As
Publication number | Publication date |
---|---|
TW201917292A (en) | 2019-05-01 |
TWI667411B (en) | 2019-08-01 |
CN109695582A (en) | 2019-04-30 |
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