Miniature high-speed fan

Abstract

Disclosed is a miniature high-speed fan. The miniature high-speed fan includes a housing, a blade wheel, a stator and a rotor. The housing is provided with a middle through chamber. The housing is provided with a frame in the middle through chamber. The stator is fixedly installed inside the frame. The frame is provided with a through opening at one end and a rear cover at the other end. A bearing installation groove is formed in each of the through opening and the rear cover. Bearings at shaft rods at two ends of the rotor are respectively installed in the bearing installation grooves. A pre-compressed spring is arranged on at least one shaft rod of the rotor, and one end of the spring abuts against the corresponding bearing.

Description

BACKGROUND OF THE DISCLOSURETechnical Field

[0001] The present disclosure relates to the technical field of fans and, in particular, to a miniature high-speed fan.Description of Related Art

[0002] As we all know, a fan is a machine that relies on an input mechanical energy to increase gas pressure and send gas out. The fan is a driven fluid machine and also a gas compression and gas transfer machine that converts a rotating mechanical energy into a gas pressure energy and a kinetic energy, and sends gas out. Fans are widely used in various places, as well as in household appliances in daily life, such as vacuum cleaners and hair dryers.

[0003] At present, when these fans are used in household appliances, the fans will be made small or miniature. However, in order to meet the demand for efficiency, the fans need to be structured as high-speed fans, that is, the rotation speed of the fans must be higher. For a fan, it mainly comprises a blade wheel, a housing, an air inlet, an air outlet, a bracket, a stator, a rotor, and a transmission part (bearing). A shaft rod of the rotor needs to be assembled with the bearing, and the bearing needs to be installed on the housing or the bracket. The blade wheel is sleeved on the shaft rod of the rotor. In the context of a requirement for high speed, due to the small size and a big challenge in installation, tolerance easily appears during the installation of the bearing, easily hindering the installation firmness of the bearing. Once the installation of the bearing is not firm enough, the bearing gets loss easily. As a result, it easily makes noise and easily affects the rotation speed, bringing drawbacks to miniature high-speed fans.SUMMARY OF THE DISCLOSURE

[0004] In view of the above shortcomings in the prior art, an objective of the present disclosure is to provide a miniature high-speed fan.

[0005] In order to achieve the above objective, the present disclosure adopts the following technical solutions:

[0006] A miniature high-speed fan includes a housing, a blade wheel, a stator and a rotor. The housing is provided with a middle through chamber. The housing is provided with a frame in the middle through chamber. The stator is fixedly installed inside the frame. The rotor is located in the middle of the stator. The frame is provided with a through opening at one end and a rear cover at the other end. A bearing installation groove is formed in each of the through opening and the rear cover. Bearings at shaft rods at two ends of the rotor are respectively installed in the bearing installation grooves such that the rotor is positioned between the through opening and the rear cover. A pre-compressed spring is arranged on at least one shaft rod of the rotor, and one end of the spring abuts against the corresponding bearing. The blade wheel is arranged at the end symmetrical to the rear cover and connected to the shaft rods of the rotor.

[0007] Preferably, the miniature high-speed fan further includes a circuit board, conductive pins are arranged on the stator, one ends of the conductive pins are connected to a coil of the stator, and the other ends of the conductive pins pass through the rear cover and are placed outside the housing and welded to the circuit board.

[0008] Preferably, six conductive pins are provided and respectively arranged in a circular array around the circuit board.

[0009] Preferably, the rear cover is made of an insulating plastic.

[0010] Preferably, deflectors are arranged between the frame and a chamber wall of the middle through chamber.

[0011] Preferably, an end of the frame, that is located at the blade wheel, and the rear cover are provided with air guide holes, and the air guide holes are in communication with the interior of the frame.

[0012] Preferably, the conductive pins pass through the air guide holes.

[0013] Based on the above solutions, according to the present disclosure, since a spring is positioned at the shaft rod and the bearing of the rotor, the bearings at the two ends are subject to an outward pushing force. This outward pushing force provides a pre-tightening force when the bearings are installed in the bearing installation grooves. This design can effectively prevent the installed bearings from getting loose such that the whole assembly can be better adapted to the requirements of high-speed rotating work. Moreover, the conductive pins serve as circuit guides, and the circuit board is placed outside and is separated from the stator, the frame and the housing, thereby improving the heat dissipation efficiency of the circuit board, avoiding excessive heat transfer to the circuit board, and prolonging the working life of the circuit board.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a schematic structural diagram of a miniature high-speed fan in an embodiment of the present disclosure.

[0015] FIG. 2 is a schematic structural diagram of the miniature high-speed fan in an embodiment of the present disclosure viewed from another end.

[0016] FIG. 3 is a sectional view of the miniature high-speed fan in an embodiment of the present disclosure.DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the objective, technical solution and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present disclosure but not to define the present disclosure.

[0018] In the description of the present disclosure, it should be understood that the orientation or position relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., are based on the orientation or position relationships shown in the accompanying drawings and are used only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present disclosure. In addition, the terms “first” and “second” are used for descriptive purposes only rather than being understood as indicating or implying relative importance or as implicitly indicating the quantity of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. As described herein, “a plurality of” means two or more, unless otherwise clearly and specifically defined.

[0019] In the description of the present disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms such as “mounted”, “connected to” and“connect” shall be understood broadly. For example, they may refer to fixed connection, detachable connection, or integrated connection. They may refer to mechanical connection or electrical connection. They may refer to direct connection or indirect connection by means of an intermediate medium. They may refer to internal connection between two elements or an interactive relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0020] As shown in FIGS. 1-3, a miniature high-speed fan in this embodiment includes a housing 1, a blade wheel 2, a stator 3 and a rotor 4. The housing 1 is provided with a middle through chamber 11. The housing 1 is provided with a frame 12 in the middle through chamber 11. The stator 3 is fixedly installed inside the frame 12. The rotor 4 is located in the middle of the stator 3. The frame 12 is provided with a through opening 13 at one end and a rear cover 14 at the other end. A bearing installation groove 15 is formed in each of the through opening 13 and the rear cover 14. Bearings 42 at shaft rods 41 at two ends of the rotor 4 are respectively installed in the bearing installation grooves 15 such that the rotor 4 is positioned between the through opening 13 and the rear cover 14. A pre-compressed spring 43 is arranged on at least one shaft rod 41 of the rotor 4, and one end of the spring 43 abuts against the corresponding bearing 42. The blade wheel 2 is arranged at the end symmetrical to the rear cover 14 and connected to the shaft rods 41 of the rotor 4.

[0021] In this embodiment, since a spring 43 is positioned at each shaft rod 41 and the corresponding bearing 42 of the rotor 4 and the spring 43 specifically abuts against an inner ring of the corresponding bearing 42, the bearings 42 at the two ends are subject to an outward pushing force. This outward pushing force provides a pre-tightening force when the bearings 42 are installed in the bearing installation grooves 15. This design can effectively prevent the installed bearings 42 from getting loose such that the whole assembly can be better adapted to the requirements of high-speed rotating work. This design also can reduce the noise and ensures stability in the case of high-speed rotation.

[0022] Further, in this embodiment, the miniature high-speed fan further includes a circuit board 5, conductive pins 31 are arranged on the stator 3, one ends of the conductive pins 31 are connected to a coil of the stator 3, and the other ends of the conductive pins 31 pass through the rear cover 14 and are placed outside the housing 1 and welded to the circuit board 5. In this design, the conductive pins 31 serve as circuit guides, and the circuit board 5 is placed outside and is separated from the stator 3, the frame 12 and the housing 1, thereby improving the heat dissipation efficiency of the circuit board 5, avoiding excessive heat transfer to the circuit board 5, and prolonging the working life of the circuit board 5.

[0023] Further, in this embodiment, six conductive pins 31 are provided and respectively arranged in a circular array around the circuit board 5. In this way, when the circuit board 5 is assembled, connection positions are distributed more uniformly and the circuit board 5 is supported more uniformly.

[0024] Further, since the conductive pins 31 pass through the rear cover 14, the conductive pins 31 may come into contact with the rear cover 14. Therefore, in order to avoid electric leakage or short circuit, the rear cover 14 is made of an insulating plastic in this embodiment.

[0025] Further, in this embodiment, the airflow diversion of the fan relies on the blade wheel 2 as the driving force, and the air flows in the middle through chamber of the housing 1. Therefore, in order to gather the airflow and enhance the subsequent wind speed, in this embodiment, deflectors 16 are arranged between the frame 12 and a chamber wall of the middle through chamber 11. The deflectors 16 are arc-shaped, and the arc-shaped direction of the deflectors 16 remains consistent.

[0026] Further, in order to avoid affecting the rotation speed of the blade wheel due to backflow under the blade wheel 2, in this embodiment, an end of the frame 12, that is located at the blade wheel 2, and the rear cover 14 are provided with air guide holes 17, the air guide holes 17 are in communication with the interior of the frame 12, and the conductive pins 17 pass through the air guide holes 17. In this way, the air at the lower end of the blade wheel and close to the inside may also form a flow to avoid backflow. This part of the air flow may also pass through the stator 3 and the rotor 4, which may also cool the stator 3 and the rotor 4.

[0027] The above is only the preferred embodiment of the present disclosure, and does not therefore limit the scope of the patent of the present disclosure. All the equivalent structure or equivalent process transformations made by using the contents of the specification of the present disclosure and the accompanying drawings, or directly or indirectly applied in other related technical fields, are similarly included in the scope of patent of the present disclosure.

Examples

Embodiment Construction

[0017]In order to make the objective, technical solution and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present disclosure but not to define the present disclosure.

[0018]In the description of the present disclosure, it should be understood that the orientation or position relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., are based on the orientation or position relationships shown in the accompanying drawings and are used only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or ...

BACKGROUND OF THE DISCLOSURETechnical Field

[0001] The present disclosure relates to the technical field of fans and, in particular, to a miniature high-speed fan.Description of Related Art

[0002] As we all know, a fan is a machine that relies on an input mechanical energy to increase gas pressure and send gas out. The fan is a driven fluid machine and also a gas compression and gas transfer machine that converts a rotating mechanical energy into a gas pressure energy and a kinetic energy, and sends gas out. Fans are widely used in various places, as well as in household appliances in daily life, such as vacuum cleaners and hair dryers.

[0003] At present, when these fans are used in household appliances, the fans will be made small or miniature. However, in order to meet the demand for efficiency, the fans need to be structured as high-speed fans, that is, the rotation speed of the fans must be higher. For a fan, it mainly comprises a blade wheel, a housing, an air inlet, an air outlet, a bracket, a stator, a rotor, and a transmission part (bearing). A shaft rod of the rotor needs to be assembled with the bearing, and the bearing needs to be installed on the housing or the bracket. The blade wheel is sleeved on the shaft rod of the rotor. In the context of a requirement for high speed, due to the small size and a big challenge in installation, tolerance easily appears during the installation of the bearing, easily hindering the installation firmness of the bearing. Once the installation of the bearing is not firm enough, the bearing gets loss easily. As a result, it easily makes noise and easily affects the rotation speed, bringing drawbacks to miniature high-speed fans.SUMMARY OF THE DISCLOSURE

[0004] In view of the above shortcomings in the prior art, an objective of the present disclosure is to provide a miniature high-speed fan.

[0005] In order to achieve the above objective, the present disclosure adopts the following technical solutions:

[0006] A miniature high-speed fan includes a housing, a blade wheel, a stator and a rotor. The housing is provided with a middle through chamber. The housing is provided with a frame in the middle through chamber. The stator is fixedly installed inside the frame. The rotor is located in the middle of the stator. The frame is provided with a through opening at one end and a rear cover at the other end. A bearing installation groove is formed in each of the through opening and the rear cover. Bearings at shaft rods at two ends of the rotor are respectively installed in the bearing installation grooves such that the rotor is positioned between the through opening and the rear cover. A pre-compressed spring is arranged on at least one shaft rod of the rotor, and one end of the spring abuts against the corresponding bearing. The blade wheel is arranged at the end symmetrical to the rear cover and connected to the shaft rods of the rotor.

[0007] Preferably, the miniature high-speed fan further includes a circuit board, conductive pins are arranged on the stator, one ends of the conductive pins are connected to a coil of the stator, and the other ends of the conductive pins pass through the rear cover and are placed outside the housing and welded to the circuit board.

[0008] Preferably, six conductive pins are provided and respectively arranged in a circular array around the circuit board.

[0009] Preferably, the rear cover is made of an insulating plastic.

[0010] Preferably, deflectors are arranged between the frame and a chamber wall of the middle through chamber.

[0011] Preferably, an end of the frame, that is located at the blade wheel, and the rear cover are provided with air guide holes, and the air guide holes are in communication with the interior of the frame.

[0012] Preferably, the conductive pins pass through the air guide holes.

[0013] Based on the above solutions, according to the present disclosure, since a spring is positioned at the shaft rod and the bearing of the rotor, the bearings at the two ends are subject to an outward pushing force. This outward pushing force provides a pre-tightening force when the bearings are installed in the bearing installation grooves. This design can effectively prevent the installed bearings from getting loose such that the whole assembly can be better adapted to the requirements of high-speed rotating work. Moreover, the conductive pins serve as circuit guides, and the circuit board is placed outside and is separated from the stator, the frame and the housing, thereby improving the heat dissipation efficiency of the circuit board, avoiding excessive heat transfer to the circuit board, and prolonging the working life of the circuit board.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] FIG. 1 is a schematic structural diagram of a miniature high-speed fan in an embodiment of the present disclosure.

[0015] FIG. 2 is a schematic structural diagram of the miniature high-speed fan in an embodiment of the present disclosure viewed from another end.

[0016] FIG. 3 is a sectional view of the miniature high-speed fan in an embodiment of the present disclosure.DETAILED DESCRIPTION OF THE INVENTION

[0017] In order to make the objective, technical solution and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present disclosure but not to define the present disclosure.

[0018] In the description of the present disclosure, it should be understood that the orientation or position relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., are based on the orientation or position relationships shown in the accompanying drawings and are used only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limiting the present disclosure. In addition, the terms “first” and “second” are used for descriptive purposes only rather than being understood as indicating or implying relative importance or as implicitly indicating the quantity of technical features indicated. Therefore, the features defined as “first” and “second” may explicitly or implicitly include one or more of the features. As described herein, “a plurality of” means two or more, unless otherwise clearly and specifically defined.

[0019] In the description of the present disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms such as “mounted”, “connected to” and“connect” shall be understood broadly. For example, they may refer to fixed connection, detachable connection, or integrated connection. They may refer to mechanical connection or electrical connection. They may refer to direct connection or indirect connection by means of an intermediate medium. They may refer to internal connection between two elements or an interactive relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific situations.

[0020] As shown in FIGS. 1-3, a miniature high-speed fan in this embodiment includes a housing 1, a blade wheel 2, a stator 3 and a rotor 4. The housing 1 is provided with a middle through chamber 11. The housing 1 is provided with a frame 12 in the middle through chamber 11. The stator 3 is fixedly installed inside the frame 12. The rotor 4 is located in the middle of the stator 3. The frame 12 is provided with a through opening 13 at one end and a rear cover 14 at the other end. A bearing installation groove 15 is formed in each of the through opening 13 and the rear cover 14. Bearings 42 at shaft rods 41 at two ends of the rotor 4 are respectively installed in the bearing installation grooves 15 such that the rotor 4 is positioned between the through opening 13 and the rear cover 14. A pre-compressed spring 43 is arranged on at least one shaft rod 41 of the rotor 4, and one end of the spring 43 abuts against the corresponding bearing 42. The blade wheel 2 is arranged at the end symmetrical to the rear cover 14 and connected to the shaft rods 41 of the rotor 4.

[0021] In this embodiment, since a spring 43 is positioned at each shaft rod 41 and the corresponding bearing 42 of the rotor 4 and the spring 43 specifically abuts against an inner ring of the corresponding bearing 42, the bearings 42 at the two ends are subject to an outward pushing force. This outward pushing force provides a pre-tightening force when the bearings 42 are installed in the bearing installation grooves 15. This design can effectively prevent the installed bearings 42 from getting loose such that the whole assembly can be better adapted to the requirements of high-speed rotating work. This design also can reduce the noise and ensures stability in the case of high-speed rotation.

[0022] Further, in this embodiment, the miniature high-speed fan further includes a circuit board 5, conductive pins 31 are arranged on the stator 3, one ends of the conductive pins 31 are connected to a coil of the stator 3, and the other ends of the conductive pins 31 pass through the rear cover 14 and are placed outside the housing 1 and welded to the circuit board 5. In this design, the conductive pins 31 serve as circuit guides, and the circuit board 5 is placed outside and is separated from the stator 3, the frame 12 and the housing 1, thereby improving the heat dissipation efficiency of the circuit board 5, avoiding excessive heat transfer to the circuit board 5, and prolonging the working life of the circuit board 5.

[0023] Further, in this embodiment, six conductive pins 31 are provided and respectively arranged in a circular array around the circuit board 5. In this way, when the circuit board 5 is assembled, connection positions are distributed more uniformly and the circuit board 5 is supported more uniformly.

[0024] Further, since the conductive pins 31 pass through the rear cover 14, the conductive pins 31 may come into contact with the rear cover 14. Therefore, in order to avoid electric leakage or short circuit, the rear cover 14 is made of an insulating plastic in this embodiment.

[0025] Further, in this embodiment, the airflow diversion of the fan relies on the blade wheel 2 as the driving force, and the air flows in the middle through chamber of the housing 1. Therefore, in order to gather the airflow and enhance the subsequent wind speed, in this embodiment, deflectors 16 are arranged between the frame 12 and a chamber wall of the middle through chamber 11. The deflectors 16 are arc-shaped, and the arc-shaped direction of the deflectors 16 remains consistent.

[0026] Further, in order to avoid affecting the rotation speed of the blade wheel due to backflow under the blade wheel 2, in this embodiment, an end of the frame 12, that is located at the blade wheel 2, and the rear cover 14 are provided with air guide holes 17, the air guide holes 17 are in communication with the interior of the frame 12, and the conductive pins 17 pass through the air guide holes 17. In this way, the air at the lower end of the blade wheel and close to the inside may also form a flow to avoid backflow. This part of the air flow may also pass through the stator 3 and the rotor 4, which may also cool the stator 3 and the rotor 4.

[0027] The above is only the preferred embodiment of the present disclosure, and does not therefore limit the scope of the patent of the present disclosure. All the equivalent structure or equivalent process transformations made by using the contents of the specification of the present disclosure and the accompanying drawings, or directly or indirectly applied in other related technical fields, are similarly included in the scope of patent of the present disclosure.

Examples

Embodiment Construction

[0017]In order to make the objective, technical solution and advantages of the present disclosure more clearly understood, the present disclosure is further described in detail in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present disclosure but not to define the present disclosure.

[0018]In the description of the present disclosure, it should be understood that the orientation or position relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., are based on the orientation or position relationships shown in the accompanying drawings and are used only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or ...

Claims

1. A miniature high-speed fan, comprising a housing, a blade wheel, a stator and a rotor, wherein the housing is provided with a middle through chamber; the housing is provided with a frame in the middle through chamber; the stator is fixedly installed inside the frame; the rotor is located in the middle of the stator; the frame is provided with a through opening at one end and a rear cover at the other end; a bearing installation groove is formed in each of the through opening and the rear cover; bearings at shaft rods at two ends of the rotor are respectively installed in the bearing installation grooves such that the rotor is positioned between the through opening and the rear cover; a pre-compressed spring is arranged on at least one shaft rod of the rotor, and one end of the spring abuts against the corresponding bearing; the blade wheel is arranged at the end symmetrical to the rear cover and connected to the shaft rods of the rotor.

2. The miniature high-speed fan according to claim 1, further comprising a circuit board, wherein conductive pins are arranged on the stator, one ends of the conductive pins are connected to a coil of the stator, and the other ends of the conductive pins pass through the rear cover and are placed outside the housing and welded to the circuit board.

3. The miniature high-speed fan according to claim 2, characterized in that six conductive pins are provided and respectively arranged in a circular array around the circuit board.

4. The miniature high-speed fan according to claim 3, characterized in that the rear cover is made of an insulating plastic.

5. The miniature high-speed fan according to claim 1, characterized in that: deflectors are arranged between the frame and a chamber wall of the middle through chamber.

6. The miniature high-speed fan according to claim 2, characterized in that: an end of the frame, that is located at the blade wheel, and the rear cover are provided with air guide holes, and the air guide holes are in communication with the interior of the frame.

7. The miniature high-speed fan according to claim 6, characterized in that: the conductive pins pass through the air guide holes.

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