Patent Description:
This application relates to the field of heat dissipation technologies for electronic products, and in particular, to a fan for an electronic device.

<CIT> relates to a device and a method for radiating. It is described that the device is arranged inside a casing provided with a first opening, and a fan is used for generating a first cooling airflow. It is described that the device comprises a radiating assembly and an air deflector, wherein the radiating assembly is provided with a first area and a second area, and the first cooling air flows from the first area to the second area. It is described that the air deflector is installed in the first area of the radiating assembly and used for reducing the section area of the first cooling airflow flowing in the first area in the flowing direction of the first cooling airflow so as to suck the air outside the casing to flow into the second area through the first opening to generate a second cooling airflow.

Currently, electronic components such as processors inside electronic devices will emit heat during operation. If the heat emitted by the electronic components during operation cannot be dissipated in a timely manner, the electronic devices will stop operating, and in severe cases, the processors may be burned out. To resolve the foregoing problem, existing manufacturers have arranged fans in electronic devices to dissipate heat from components such as processors. However, existing fans have poor heat dissipation capabilities.

This application provides a fan and an electronic device, so as to improve a heat dissipation effect and prevent overheating of electronic components such as processors.

Appended claim <NUM> defines a fan for an electronic device. The invention and its scope of protection is defined by this independent claim. The following aspects and implementations of the summary provide examples of how technical subject matters can be combined.

According to a first aspect, this application provides a fan, including a body. The body includes an end cover, a bottom cover, a peripheral plate, blades, and a flow guiding member; the end cover and the bottom cover are opposite and spaced apart, two opposite sides of the peripheral plate in a thickness direction of the fan are connected to the end cover and the bottom cover respectively; the end cover, the bottom cover, and the peripheral plate form an air duct extending in a length direction of the fan, and the blades and the flow guiding member are mounted between the end cover and the bottom cover.

The air duct includes an air inlet area and an air outlet area that are sequentially distributed and communicated in the length direction of the fan; the end cover is provided with an air inlet communicated with the air inlet area; a part between the end cover and the bottom cover is not connected by a connecting plate to form an air outlet; the air outlet area is corresponding to the air outlet and is communicated with the air outlet; and the blades are located in the air inlet area, and the flow guiding member is located in the air outlet area.

The flow guiding member includes a first guide plate, a second guide plate, and a sleeve; the end cover, the first guide plate, the second guide plate, and the bottom cover are sequentially laminated and spaced apart in the thickness direction of the fan, so that a first channel is formed between the first guide plate and an inner wall of the air duct, the first guide plate and the second guide plate are oppositely spaced apart to form a second channel, and a third channel is formed between the second guide plate and the inner wall of the air duct; and the first channel, the second channel, and the third channel are sequentially disposed in the thickness direction of the fan.

The sleeve is located in the first channel or the third channel, and includes a flow guiding cavity; one side that is of the second channel and that faces the air inlet area is isolated from the air inlet area, one side that is of the second channel and that faces away from the air inlet area forms a flow guiding outlet, and the flow guiding outlet and the air outlet face the same direction and are communicated.

In the length direction of the fan, the air inlet area, the first channel, and the air outlet are sequentially communicated to form an air flow path, and the air inlet area, the third channel, and the air outlet are sequentially communicated to form another air flow path. In the thickness direction of the fan, the flow guiding inlet, the flow guiding cavity, and the second channel are sequentially communicated; and in the length direction of the fan, the second channel is also communicated with the flow guiding outlet and the air outlet, and finally the flow guiding inlet, the flow guiding cavity, the second channel, the flow guiding outlet, and the air outlet are sequentially communicated to form still another air flow path.

In this embodiment, when the fan is operating, the blades in the air inlet area rotate to allow outside air to enter the air inlet area from the air inlet to form a main airflow, and then the main airflow flows from the air inlet area to the air outlet area, and finally blows out through the air outlet. When the main airflow flows to the air outlet area, because the second channel is separated from the air inlet area, the main airflow is divided into two streams to enter the first channel and the third channel respectively. Because spaces of the first channel and the third channel are smaller than a space of the air inlet area, a flow rate of the main airflow divided into two streams is increased after entering the first channel and the third channel. When two streams of high-speed main airflow flow through the flow guiding outlet on one side that is of the second channel and that is away from the air inlet area, negative pressure areas are formed on two sides of the flow guiding outlet. Air pressures in the negative pressure areas are lower than an air pressure in the second channel, resulting in a differential pressure between air pressures in the negative pressure areas and the second channel. Under an action of the differential pressure, outside air is induced to enter the flow guiding cavity from the flow guiding inlet to form an induced airflow, then the induced airflow enters the second channel from the flow guiding cavity, finally flows to the air outlet through the flow guiding outlet, and then blows out from the air outlet. When flowing to the air outlet, the two streams of high-speed main airflow rub against the body at the air outlet. Under an action of friction, the high-speed main airflow drives ambient air to generate a driven airflow. Therefore, at the air outlet of the fan, a total air output of the fan includes three parts: the main airflow, the induced airflow, and the driven airflow. Compared with a conventional component without the flow guiding member, the air output is significantly increased, and therefore, heat dissipation efficiency is improved.

Because the sleeve is located in the first channel or the third channel, the main airflow is blocked by the sleeve when flowing through a position where the sleeve is located. In this case, a flow rate of the main airflow is further increased, so that the differential pressure between air pressures in the negative pressure areas and the second channel is more significant. Therefore, more air is induced to enter the flow guiding cavity to form an induced airflow with a larger air volume.

In an embodiment, the body includes an end cover, the end cover forms an inner wall that is of the air duct and that is corresponding to the first guide plate, the sleeve includes a first sleeve, and the first sleeve is located in the first channel, and is hermetically connected to the end cover and the first guide plate respectively along two opposite ends in the thickness direction of the fan; the flow guiding inlet includes a first flow guiding inlet formed on the end cover, the flow guiding cavity includes a first flow guiding cavity formed on the first sleeve, and the first flow guiding cavity is communicated with the first flow guiding inlet and the second channel. The first sleeve is disposed, and a flow guiding cavity of the first sleeve is referred to as the first flow guiding cavity. Then a flow rate of a part of the main airflow entering the first channel is further increased due to blocking of the first sleeve. When the main airflow in the first channel flows through the flow guiding outlet, the differential pressure between air pressures in the negative pressure areas and the second channel is more significant. Under an action of the differential pressure, outside air enters the first flow guiding cavity from the first flow guiding inlet to form a first induced airflow, the first induced airflow then enters the second channel from the first flow guiding cavity, and finally flows to the air outlet through the flow guiding outlet, thereby increasing the total air output of the fan.

In an embodiment, the first guide plate is disposed around a periphery of the first sleeve, so that the first channel surrounds the periphery of the first sleeve. Therefore, the first sleeve is located in the middle of the first channel in the length direction of the fan. In this case, the flow rate of the part of the main airflow entering the first channel is increased once due to a spatial difference between the first channel and the air inlet area, and the flow rate is increased once again under blocking of the first sleeve, so that the part of the main airflow in the first channel may be accelerated twice.

In an embodiment, an edge that is of the first guide plate and that faces the air inlet area is aligned with a part of an edge of the first sleeve. Therefore, the first sleeve is located at an edge that is of the first channel and that faces the air inlet area. In this case, the flow rate of the part of the main airflow entering the first channel is increased rapidly due to the spatial difference between the first channel and the air inlet area and blocking of the first sleeve.

In an embodiment, the sleeve includes a plurality of first sleeves, the flow guiding inlet includes a plurality of first flow guiding inlets formed on the end cover, and the plurality of first flow guiding inlets are in a one-to-one communication with the plurality of first sleeves. The plurality of first sleeves and the plurality of corresponding first flow guiding inlets are disposed, so that an air volume of the first induced airflow is increased, thereby further increasing the total air output of the fan.

In an embodiment, the plurality of first sleeves and the plurality of first flow guiding inlets are equally spaced apart in the thickness direction of the fan. Therefore, the first induced airflow is evenly distributed, so that air outflow uniformity at the air outlet may be increased.

In an embodiment, the body includes a bottom cover, the bottom cover forms an inner wall that is of the air duct and that is corresponding to the second guide plate, the sleeve includes a second sleeve, and the second sleeve is located in the third channel, and is hermetically connected to the bottom cover and the second guide plate respectively along two opposite ends in the thickness direction of the fan; and the flow guiding inlet includes a second flow guiding inlet formed on the bottom cover, the flow guiding cavity includes a second flow guiding cavity formed on the second sleeve, and the second flow guiding cavity is communicated with the second flow guiding inlet and the second channel. The second sleeve is disposed, and a flow guiding cavity of the second sleeve is referred to as the second flow guiding cavity. Then a flow rate of a part of the main airflow entering the third channel is further increased due to blocking of the second sleeve. When the main airflow in the third channel flows through the flow guiding outlet, the differential pressure between air pressures in the negative pressure areas and the second channel is more significant. Under an action of the differential pressure, outside air enters the flow guiding cavity of the second sleeve from the second flow guiding inlet to form a second induced airflow, the second induced airflow then enters the second channel from the second flow guiding cavity, and finally flows to the air outlet through the flow guiding outlet, thereby increasing the total air output of the fan.

In an embodiment, the second guide plate is disposed around a periphery of the second sleeve, so that the third channel surrounds the periphery of the second sleeve. Therefore, the second sleeve is located in the middle of the third channel in the length direction of the fan. In this case, the flow rate of the part of the main airflow entering the third channel is increased once due to a spatial difference between the third channel and the air inlet area, and the flow rate is increased once again under blocking of the second sleeve, so that the part of the main airflow in the third channel may be accelerated twice.

In an embodiment, the sleeve includes a plurality of second sleeves, the flow guiding inlet includes a plurality of second flow guiding inlets formed on the bottom cover, and the plurality of second flow guiding inlets are communicated with the plurality of second sleeves in a one-to-one correspondence. The plurality of second sleeves and the plurality of corresponding second flow guiding inlets are disposed, so that an air volume of the second induced airflow may be increased, thereby further increasing the total air output of the fan.

In an embodiment, the plurality of second sleeves and the plurality of second flow guiding inlets are equally spaced apart in a width direction of the fan. Therefore, the second induced airflow is evenly distributed, so that air outflow uniformity at the air outlet may be increased.

In an embodiment, in a direction perpendicular to the thickness direction, the flow guiding inlet and the flow guiding cavity are opposite, and have the same cross-sectional area and shape. Therefore, compared with a situation in which the flow guiding inlet and the flow guiding cavity are not aligned, the flow guiding inlet and the flow guiding cavity are aligned, so that a resistance to an induced airflow may be reduced, thereby reducing losses of the induced airflow, and ensuring that almost all of the induced airflow enters the second channel.

In an embodiment, in the length direction of the fan, widths of the first guide plate, the second guide plate, and the air outlet area are the same. Therefore, the first guide plate, the second baffle, the end cover, and the bottom cover are flush at the air outlet, so as to facilitate machining.

In an embodiment, the air outlet area includes a mounting area and a guide area, the mounting area is corresponding to the air inlet area and is communicated with the air inlet area, and the guide area is corresponding to the air outlet and is communicated with the air outlet; and the flow guiding member is mounted in the mounting area, and in the length direction of the fan, widths of the first guide plate, the second guide plate, and the mounting area are the same. Therefore, the first guide plate and the second guide plate are retracted with respect to the air outlet to be hidden in the air duct, so as to reduce a weight of the fan, prevent the first guide plate and the second guide plate from shielding the guide area, guide an airflow in the guide area, and provide a surface with a Coanda effect.

In an embodiment, the body includes an end cover and a bottom cover that are opposite and spaced apart, the end cover includes a first guide surface facing the air duct, and a first convex portion is formed in the middle of a part that is of the first guide surface and that faces the guide area; and the bottom cover includes a second guide surface facing the air duct, a second convex portion is formed in the middle of a part that is of the second guide surface and that faces the guide area, and the first convex portion and the second convex portion protrude toward each other. Therefore, the first guide surface and the second guide surface become curved surfaces with a Coanda effect, and the surfaces with the Coanda effect enable an airflow to flow more smoothly, thereby reducing turbulence at the air outlet and reducing air volume losses.

In an embodiment, the sleeve includes an inner wall surface facing the flow guiding cavity, and an outer wall surface facing away from the inner wall surface, and the outer wall surface is streamlined. The streamlined outer wall surface has a small resistance to an airflow, and when the airflow flows through the outer wall surface, air volume losses are small.

In an embodiment, the flow guiding member further includes a connecting plate, two opposite sides of the connecting plate in the thickness direction of the fan are respectively connected to the first guide plate and the second guide plate, the connecting plate separates the second channel from the air inlet area, and sides that are of the first guide plate and the second guide plate and that face away from the connecting plate face the air outlet area and form the flow guiding outlet. The connecting plate connects sides that are of the first guide plate and the second guide plate and that face the air inlet area, thereby isolating the second channel from the air inlet area, and preventing the main airflow in the air inlet area from flowing into the second channel.

In an embodiment, the connecting plate is an arc-shaped sheet. The connecting plate is arc-shaped, so that a resistance to an airflow may be reduced, and losses of the airflow flowing through the connecting plate may be reduced.

In an embodiment, the connecting plate is a rectangular sheet.

In an embodiment, the air duct further includes a conveying area, and the conveying area is located between the air inlet area and the air outlet area, and is communicated with the air inlet area and the air outlet area respectively. The conveying area separates the air inlet area from the air outlet area, so that the blades located in the air inlet area are separated from the flow guiding member located in the air outlet area to prevent the blades from interfering with the flow guiding member when rotating.

In an embodiment, the body includes an end cover, a bottom cover, and a peripheral plate, the end cover and the bottom cover are opposite and spaced apart, two opposite sides of the peripheral plate in the thickness direction of the fan are connected to the end cover and the bottom cover respectively, the end cover, the bottom cover, and the peripheral plate form the air duct, the end cover and the bottom cover form the air outlet, and the flow guiding inlet is formed on the end cover and/or the bottom cover; and the flow guiding member is mounted between the end cover and the bottom cover. Therefore, the body has a simple structure, is easy to machine, and require low costs.

In an embodiment, the bottom cover, the peripheral plate, and the flow guiding member are integrally formed into a base, and the end cover is detachably connected to the peripheral plate; the sleeve includes a first sleeve, the first sleeve is located in the first channel and includes an end wall surface facing the end cover, and the end wall surface is hermetically bonded to the end cover. Therefore, machining is easy, and the end cover can be easily removed to overhaul components such as the blades. In addition, the end wall surface is bonded to the end cover to prevent the flow guiding cavity from being communicated with the first channel or the third channel, and prevent the main airflow from entering the second channel.

According to a second aspect, an embodiment of this application provides an electronic device, including a housing and a heat sink, where the housing includes an accommodating cavity, and an air vent and a thermovent that are communicated with the accommodating cavity, the heat sink is mounted in the accommodating cavity, the heat sink includes the fan according to the first aspect of this embodiment of this application, the air inlet of the fan faces the air vent, and the air outlet of the fan faces the thermovent.

To describe technical solutions in embodiments or the background of this application more clearly, the following describes accompanying drawings required in embodiments or the background of this application.

Embodiments of this application will be described with reference to accompanying drawings in embodiments of this application.

Referring to <FIG> and <FIG>, <FIG> is a schematic diagram of a structure of an electronic device according to an embodiment of this application in a state; and <FIG> is a schematic diagram of a structure of a housing of the electronic device shown in <FIG> in an open state. An embodiment of this application provides an electronic device <NUM>, and the electronic device <NUM> is an electronic product such as a game console, a notebook computer, a personal digital assistant, a learning machine, and a tablet computer. In this embodiment, that the electronic device <NUM> is a notebook computer is used as an example for description.

For ease of description, a length direction of the electronic device <NUM> is defined as an X-axis direction, a width direction of the electronic device <NUM> is defined as a Y-axis direction, and a thickness direction of the electronic device <NUM> is defined as a Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other.

In this embodiment, the electronic device <NUM> includes a display <NUM>, a rotating shaft member <NUM>, and a main body <NUM>. The display <NUM> is connected to the main body <NUM> by using the rotating shaft member <NUM>, and the display <NUM> may be unfolded or folded with respect to the main body <NUM>. When the display <NUM> is unfolded with respect to the main body <NUM>, the display <NUM> is at an angle to the main body <NUM>, and the electronic device <NUM> may be used by a user; and when the display <NUM> is folded with respect to the main body <NUM>, the electronic device <NUM> is in a standby state or shutdown state for easy storage.

In this embodiment, the display <NUM> includes a display surface <NUM> and an appearance surface <NUM> that face away from each other. When the display <NUM> is folded with respect to the main body <NUM>, the display surface <NUM> is attached to the main body <NUM>, and the appearance surface <NUM> is exposed to be in a visible state; and when the display <NUM> is unfolded with respect to the main body <NUM>, the display surface <NUM> is in a visible state for observation and operation by the user.

The rotating shaft member <NUM> is a hinge connected between the display <NUM> and the main body <NUM>. The rotating shaft member <NUM> is a rotating structure between the display <NUM> and the main body <NUM> to implement free rotation of the display <NUM> with respect to the main body <NUM>.

The main body <NUM> includes a housing <NUM>, a keyboard <NUM>, electronic components (not marked in the figure), and a heat sink <NUM>. The keyboard <NUM> is mounted on the housing <NUM>, and the keyboard <NUM> is exposed with respect to the housing <NUM> for the user to operate the keyboard <NUM>. The electronic components and the heat sink <NUM> are mounted inside the housing <NUM>. The electronic components include a circuit board <NUM>, a processor <NUM>, a memory bank, a video card, and the like. The processor <NUM>, the memory bank, and the video card are integrated on the circuit board <NUM>. Specifically, the keyboard <NUM> is electrically connected to the processor <NUM>, the user may operate the keyboard <NUM> to generate an operation signal, and the processor <NUM> may process the operation signal. The heat sink <NUM> is connected to the electronic components, and the heat sink <NUM> dissipates heat generated during operation of the electronic components, especially obvious heat generated when the processor <NUM> and the video card are operating. After heat dissipation, the heat sink <NUM> can prevent the electronic components from failure due to overheating.

The housing <NUM> is cuboid, including a mounting wall <NUM>, a bottom wall <NUM>, a peripheral wall <NUM>, a mounting cavity <NUM>, a thermovent <NUM>, and an air vent. The mounting wall <NUM> and the bottom wall <NUM> are disposed facing away from each other, and are respectively located on opposite sides of the peripheral wall <NUM>. The mounting wall <NUM> is configured to mount the keyboard <NUM>. When the display <NUM> is folded with respect to the main body <NUM>, the mounting wall <NUM> is attached to the display <NUM> to shield and protect the keyboard <NUM>; and when the display <NUM> is unfolded with respect to the main body <NUM>, the mounting wall <NUM> is exposed to expose the keyboard <NUM> for the user to operate. The bottom wall <NUM> may be in contact with a desktop to support the electronic device <NUM>. The mounting wall <NUM>, the bottom wall <NUM>, and the peripheral wall <NUM> form a mounting cavity <NUM>, and the mounting cavity <NUM> is configured to accommodate the electronic components and the heat sink <NUM>. The thermovent <NUM> is disposed on the peripheral wall <NUM>, and is configured to be communicated with the outside and the mounting cavity <NUM>, so that heat from the electronic components can flow to the outside through the thermovent <NUM>. The air vent is disposed on the bottom wall <NUM>, and is configured to be communicated with the outside and the mounting cavity <NUM>, so that outside air can enter the mounting cavity <NUM> for the fan <NUM> of the heat sink <NUM> to operate.

The heat sink <NUM> is mounted in the mounting cavity <NUM> of the housing <NUM>, and includes a heat pipe <NUM>, a heat dissipation soldering iron (not shown in the figure), and the fan <NUM>. The heat pipe <NUM> is a copper pipe, and the heat dissipation soldering iron is laminated on the electronic components. One end of the heat pipe <NUM> is laminated on the heat dissipation soldering iron, and the other end is provided with fins, the fins are located at the air outlet <NUM> of the fan <NUM>, and the air outlet <NUM> of the fan <NUM> faces the thermovent <NUM> of the housing <NUM>. When the notebook computer is operating, the heat pipe <NUM> conducts heat from the electronic components to the fins, and the fan <NUM> supplies an air volume to the fins to dissipate the heat from the fins, so as to transfer the heat from the electronic components to the outside through the thermovent <NUM>.

Referring to <FIG>, and with reference to <FIG>, <FIG> is a schematic diagram of a structure of the fan shown in <FIG>, <FIG> is a schematic diagram of a structure of an end cover of the fan shown in <FIG>, and <FIG> is a schematic diagram of a structure of a base of the fan shown in <FIG>. The fan <NUM> is mounted in the mounting cavity <NUM>. The fan <NUM> includes an air duct <NUM>, an air inlet <NUM>, an air outlet <NUM>, blades <NUM>, and a body <NUM>. The air inlet <NUM>, the air outlet <NUM>, and the air duct <NUM> are all mounted on the body <NUM>, and the blades <NUM> are mounted in the air duct <NUM>. Specifically, the air inlet <NUM> is configured to be communicated with the mounting cavity <NUM> of the housing <NUM> and one side of the air duct <NUM>, and the air outlet <NUM> is configured to be communicated with the mounting cavity <NUM> of the housing <NUM> and the other side of the air duct <NUM>. An airflow enters the air duct <NUM> through the air inlet <NUM> and flows out from the air outlet <NUM>.

Referring to <FIG>, and with reference to <FIG>, <FIG> is a schematic diagram showing an airflow direction of the fan shown in <FIG>. When the notebook computer is operating, the fan <NUM> is operating. In this case, the blades <NUM> of the fan <NUM> rotate to allow outside air to enter the air duct <NUM> through the air vent of the housing <NUM> and the air inlet <NUM> of the fan <NUM>. The air entering the air duct <NUM> forms a main airflow a, and then flows out from the air outlet <NUM> and blows to the fins, so that heat from the fins can be dissipated through the thermovent <NUM> of the housing <NUM>.

Referring to <FIG>, the body <NUM> includes an end cover <NUM> and a base <NUM>, the base <NUM> includes a bottom cover <NUM> and a peripheral plate <NUM>, and the end cover <NUM> is detachably fastened to the base <NUM>. The end cover <NUM> and the bottom cover <NUM> are oppositely disposed, and are respectively located on opposite sides of the peripheral plate <NUM> in the Z-axis direction. The end cover <NUM> is detachably fastened to the peripheral plate <NUM>, and the end cover <NUM>, the bottom cover <NUM>, and the peripheral plate <NUM> form the air duct <NUM>. When the fan <NUM> is mounted in the mounting cavity <NUM>, the end cover <NUM> is opposite to the bottom wall <NUM> of the housing <NUM>, and the air inlet <NUM> is disposed on the end cover <NUM>, so that the air inlet <NUM> can be opposite to the air vent, thereby improving air intake efficiency. The peripheral plate <NUM> is opposite to the peripheral wall <NUM> of the housing <NUM>, and the air outlet <NUM> is disposed on the peripheral plate <NUM>, so that the air outlet <NUM> can be opposite to the thermovent <NUM>, thereby improving heat dissipation efficiency. In other embodiments, the end cover <NUM> and the base <NUM> are integrally formed to strengthen a structural strength of the body <NUM>.

Referring to <FIG> and <FIG>, the air duct <NUM> includes an air inlet area <NUM>, a conveying area <NUM>, and an air outlet area <NUM> that are distributed in the X-axis direction (air outlet direction) and sequentially communicated. The air inlet area <NUM> is communicated with the air inlet <NUM>, and the air outlet area <NUM> is communicated with the air outlet <NUM>. The blades <NUM> are mounted on the bottom cover <NUM>, and are located in the air inlet area <NUM> of the air duct <NUM>; and the conveying area <NUM> is located between the air inlet area <NUM> and the air outlet area <NUM> to prevent the blades <NUM> from touching a component mounted in the air outlet area <NUM> when rotating. When the fan <NUM> is operating, the blades <NUM> of the fan <NUM> rotate to allow air to enter the air inlet area <NUM> of the air duct <NUM> from the air inlet <NUM> of the fan <NUM>. The main airflow a formed by the air entering the air inlet area <NUM> flows through the conveying area <NUM> to the air outlet area <NUM>, and then flows out from the air outlet <NUM> and blows to the fins, so that heat from the fins can be dissipated through the thermovent <NUM> of the housing <NUM>. In other embodiments, the air duct <NUM> includes an air inlet area and an air outlet area, and no conveying area is provided. Therefore, a size of the air duct <NUM> in the X-axis direction may be reduced, thereby reducing a volume of the entire fan to save space.

Referring to <FIG>, the air inlet <NUM> in this embodiment is circular, and is corresponding to and communicated with the air inlet area <NUM>. When the fan <NUM> is mounted in the mounting cavity <NUM>, the air inlet <NUM> is corresponding to the air vent of the housing <NUM> and is communicated with the air vent of the housing <NUM>, and the air inlet <NUM> allows outside air to enter the air duct <NUM> through the air vent of the housing <NUM>. In other embodiments, the air inlet <NUM> is square, elliptical, trapezoidal, triangular, or the like, which may be set specifically based on a shape and a size of the end cover <NUM>.

Referring to <FIG>, the air outlet <NUM> is rectangular, and is corresponding to and communicated with the air outlet area <NUM>. When the fan <NUM> is mounted in the mounting cavity <NUM>, the air outlet <NUM> is corresponding to and communicated with the thermovent <NUM> of the housing <NUM>, and the air outlet <NUM> allows the main airflow formed through rotation of the blades <NUM> to blow to the fins, and is finally dissipated from the thermovent <NUM>. In other embodiments, the air outlet <NUM> is trapezoidal, elliptical, or the like, which may be set specifically based on a shape and a size of the peripheral plate <NUM>.

Referring to <FIG>, the blades <NUM> are made of a plastic to reduce a weight of the heat sink <NUM>. The blades <NUM> are mounted on the bottom cover <NUM>, and are located in the air inlet area <NUM>. At least a part of the blades <NUM> is exposed with respect to the air inlet <NUM>. The blades <NUM> may be driven by a motor to rotate, so that the air entering the air duct <NUM> forms the main airflow. There are a plurality of blades <NUM>, where "a plurality of' means two or more. The plurality of blades <NUM> are fastened to a rotating shaft disposed on the bottom cover <NUM>, and the rotating shaft rotates to drive the blades <NUM> to rotate, so that the blades <NUM> drive air to form the main airflow.

The body <NUM> is made of a stainless steel or a plastic to enhance a structural strength of the fan <NUM>, thereby prolonging a service life of the fan <NUM>. Referring to <FIG>, and with reference to <FIG>, <FIG> is a schematic diagram of a partially internal structure of the fan shown in <FIG>. The body <NUM> further includes a flow guiding member <NUM>.

Specifically, the air outlet area <NUM> includes a mounting area <NUM> and a guide area <NUM> that are distributed in the X-axis direction, the mounting area <NUM> faces the conveying area <NUM>, and the guide area <NUM> faces the air outlet <NUM>. The flow guiding member <NUM> is mounted in the mounting area <NUM> of the air duct <NUM>, and is fixedly connected to the bottom cover <NUM>. Because the conveying area <NUM> is located between the mounting area <NUM> and the air inlet area <NUM>, the blades <NUM> in the air inlet area <NUM> may be prevented from touching the flow guiding member <NUM> to increase a safety coefficient.

In this embodiment, referring to <FIG>, the bottom cover <NUM>, the peripheral plate <NUM> and the flow guiding member <NUM> are integrally formed into a base <NUM>, and the end cover <NUM> and the base <NUM> are detachably fastened by using a buckle and/or a screw, so that the end cover <NUM> may be separated from the base <NUM> to expose the mounting cavity <NUM> for cleaning, maintaining, or replacing the blades <NUM>. In other embodiments, the bottom cover <NUM>, the peripheral plate <NUM>, and the flow guiding member <NUM> are separately formed, and then fixedly connected through welding.

In this embodiment, with reference to <FIG> and <FIG>, the end cover <NUM> is a sheet, and includes a first flow guiding inlet <NUM>, a first guide surface <NUM>, a first appearance surface <NUM>, and a first peripheral wall surface <NUM>. The first flow guiding inlet <NUM> penetrates through the first guide surface <NUM> and the first appearance surface <NUM>, and is configured to correspond to the air outlet area <NUM> of the air duct <NUM>. A cross section of the first flow guiding inlet <NUM> is streamlined, and the first flow guiding inlet <NUM> is configured to be communicated with the interior of the flow guiding member <NUM>, so that air enters the interior of the flow guiding member <NUM> along the first flow guiding inlet <NUM> to form a first induced airflow b <NUM>, so as to increase a total air output. The first guide surface <NUM> is disposed away from the first appearance surface <NUM> in the Z-axis direction, and the first peripheral wall surface <NUM> is connected between the first guide surface <NUM> and the first appearance surface <NUM>. The first guide surface <NUM> faces the air duct, and when the fan <NUM> is not mounted in the mounting cavity <NUM>, the first appearance surface <NUM> is located outside and is in a visible state. At least a part of the first peripheral wall surface <NUM> is located at the air outlet, and is configured to form the air outlet <NUM> with the base <NUM>. In other embodiments, the first flow guiding inlet <NUM> is circular, elliptical, square, triangular, or the like, which is not limited in this application.

Referring to <FIG>, <FIG> is a sectional view taken along an A-A direction in <FIG>; <FIG> is a sectional view taken along a B-B direction in <FIG>; and <FIG> is a sectional view taken along a C-C direction in <FIG>; and with reference to <FIG>, the bottom cover <NUM> of the base <NUM> is a sheet, and the bottom cover <NUM> includes a second flow guiding inlet <NUM>, a second guide surface <NUM>, a second appearance surface <NUM>, and a second peripheral wall surface <NUM>. The second flow guiding inlet <NUM> penetrates through the second guide surface <NUM> and the second appearance surface <NUM>, and is configured to correspond to the air outlet area <NUM> of the air duct <NUM>; and the second flow guiding inlet <NUM> is streamlined, and the second flow guiding inlet <NUM> is configured to be communicated with the interior of the flow guiding member <NUM>, so that air enters the interior of the flow guiding member <NUM> along the second flow guiding inlet <NUM> to form a second induced airflow, so as to increase the total air output. The second guide surface <NUM> is disposed away from the second appearance surface <NUM>, and the second peripheral wall surface <NUM> is connected between the second guide surface <NUM> and the second appearance surface <NUM>. The second guide surface <NUM> faces the air duct, and when the fan is not mounted in the mounting cavity <NUM>, the second appearance surface <NUM> is located outside and is in a visible state. At least a part of the second peripheral wall surface <NUM> is located at the air outlet, and is configured to form the air outlet <NUM> with the end cover <NUM>. In other embodiments, the second flow guiding inlet <NUM> is circular, elliptical, square, triangular, or the like, which is not limited in this application.

Referring to <FIG> and <FIG>, sizes and shapes of the first flow guiding inlet <NUM> and the second flow guiding inlet <NUM> are the same, and the end cover <NUM> and the bottom cover <NUM> are laminated. In the Z-axis direction, the first flow guiding inlet <NUM> and the second flow guiding inlet <NUM> are oppositely communicated, and air volumes of the first induced airflow b1 and a second induced airflow b2 generated by the first flow guiding inlet <NUM> and the second flow guiding inlet <NUM> are basically the same. Because the first induced airflow b1 flows from top down and the second induced airflow b2 flows from bottom up, when the air volumes of the first induced airflow b1 and the second induced airflow b2 are basically the same, most of the air volumes of the first induced airflow b1 and the second induced airflow b2 are mixed to form an induced airflow b, so as to reduce losses of the first induced airflow b1 flowing out of the second flow guiding inlet <NUM> and losses of the second induced airflow b2 flowing out of the first flow guiding inlet <NUM>.

Referring to <FIG>, the peripheral plate <NUM> is a sheet, and is located between the end cover <NUM> and the bottom cover <NUM>. The peripheral plate <NUM> does not shield parts of the first peripheral wall surface <NUM> and the second peripheral wall surface <NUM> to form the air outlet <NUM> of the air duct <NUM> together with the end cover <NUM> and the bottom cover <NUM>. The parts of first peripheral wall surface <NUM> and the second peripheral wall surface <NUM> are located on two sides of the air outlet <NUM> in the Z-axis direction.

Referring to <FIG> and <FIG>, the flow guiding member <NUM> includes a first guide plate <NUM>, a second guide plate <NUM>, and a sleeve, a first channel is formed between the first guide plate <NUM> and an inner wall of the air duct <NUM>, the first guide plate <NUM> and the second guide plate <NUM> are oppositely spaced apart to form a second channel, and a third channel is formed between the second guide plate <NUM> and the inner wall of the air duct <NUM>; the first channel, the second channel, and the third channel are sequentially disposed in the thickness direction of the fan; and the sleeve is disposed in the first channel and/or the third channel, and the sleeve includes a flow guiding cavity. One side that is of the second channel and that faces the air inlet area <NUM> is isolated from the air inlet area <NUM>, and one side that is of the second channel and that faces away from the air inlet area <NUM> forms a flow guiding outlet, and the flow guiding outlet and the air outlet face the same direction and are communicated. In the length direction of the fan, the air inlet area <NUM>, the first channel, and the air outlet are sequentially communicated, and the air inlet area <NUM>, the third channel, and the air outlet are sequentially communicated; and in the thickness direction of the fan, the flow guiding inlet, the flow guiding cavity, and the second channel are sequentially communicated. The sleeve includes a first sleeve and/or a second sleeve, a flow guiding cavity of the first sleeve is a first flow guiding cavity, a flow guiding cavity of the second sleeve is a second flow guiding cavity, and the flow guiding inlet includes a first flow guiding inlet and/or a second flow guiding inlet.

The air inlet area <NUM>, the first channel, and the air outlet are sequentially communicated in the length direction of the fan to form a main airflow path, and the air inlet area <NUM>, the third channel, the air outlet are sequentially communicated in the length direction of the fan to form another main airflow path, and the two main airflow paths are configured to circulate main airflows from rotation of the blades. The first guide plate <NUM> and/or the second guide plate <NUM> are provided with a connecting hole corresponding to the flow guiding cavity of the sleeve, and the connecting hole is communicated with the flow guiding cavity and the second channel. The flow guiding inlet, the flow guiding cavity and the connecting hole are aligned and communicated in the thickness direction of the fan to form an induced airflow channel, and the induced airflow channel is configured to circulate induced airflows.

More specifically, in this embodiment, the flow guiding member <NUM> is mounted in the mounting area <NUM> of the air outlet area <NUM> of the air duct <NUM>. The flow guiding member <NUM> includes a first sleeve <NUM>, a second sleeve <NUM>, a first guide plate <NUM>, a second guide plate <NUM>, and a connecting plate <NUM>; and the first sleeve <NUM>, the first guide plate <NUM>, the connecting plate <NUM>, the second guide plate <NUM>, and the second sleeve <NUM> are sequentially connected in the Z-axis direction. In addition, the first guide plate <NUM> and the second guide plate <NUM> surround peripheries of the first sleeve <NUM> and the second sleeve <NUM>, respectively, the first guide plate <NUM> and the second guide plate <NUM> are oppositely spaced, and the connecting plate <NUM> is connected between the first guide plate <NUM> and the second guide plate <NUM>; and the first sleeve <NUM> is connected to the end cover <NUM>, and the second sleeve <NUM> is connected to the bottom cover <NUM>. The flow guiding member <NUM> is communicated with the first flow guiding inlet <NUM> and the second flow guiding inlet <NUM>.

Referring to <FIG>, after the end cover <NUM> and the base <NUM> are assembled, a first channel L1 is formed between the first guide plate <NUM> and the end cover <NUM> in the Z-axis direction. The first channel L1 surrounds a periphery of the first sleeve <NUM> and is communicated with the conveying area <NUM> and the air outlet <NUM>. A second channel L2 is formed among the first guide plate <NUM>, the second guide plate <NUM> and the connecting plate <NUM>, and a flow guiding outlet <NUM> is formed on one side opposite to the air outlet <NUM>. The flow guiding outlet <NUM> faces the air outlet <NUM>, so that the second channel L2 is communicated with the air outlet <NUM>. In addition, the second channel L2 is isolated from the conveying area <NUM> by using the connecting plate <NUM>. A third channel L3 is formed between the second guide plate <NUM> and the bottom cover <NUM>. The third channel L3 surrounds a periphery of the second sleeve <NUM>, and the third channel L3 is communicated with the conveying area <NUM> and the air outlet <NUM>. In the Z-axis direction, the second channel L2 is located between the first channel L1 and the third channel L3. The first flow guiding inlet <NUM> and the second flow guiding inlet <NUM> are connected to the second channel L2 by using the first sleeve <NUM> and the second sleeve <NUM> respectively.

Referring to <FIG> and <FIG>, two sides of the first sleeve <NUM> in the Z-axis direction are hermetically connected to the end cover <NUM> and the first guide plate <NUM> respectively. The first sleeve <NUM> is provided with a first flow guiding cavity <NUM> running in the Z-axis direction, and the first flow guiding cavity <NUM> is communicated with both the first flow guiding inlet and the second channel L2. Two sides of the second sleeve <NUM> in the Z-axis direction are hermetically connected to the second guide plate <NUM> and the bottom cover <NUM> respectively. The second sleeve <NUM> is provided with a second flow guiding cavity <NUM> running in the Z-axis direction, and the second flow guiding cavity <NUM> is communicated with both the second flow guiding inlet and the second channel L2.

Specifically, referring to <FIG> and <FIG>, the first sleeve <NUM> is cylindrical, and includes a first inner wall surface <NUM>, a first outer wall surface <NUM>, and an end wall surface <NUM>. The first inner wall surface <NUM> faces the first flow guiding cavity <NUM>, the first outer wall surface <NUM> faces away from the first inner wall surface <NUM>, and two sides of the end wall surface <NUM> are connected to the first inner wall surface <NUM> and the first outer wall surface <NUM> respectively. The end wall surface <NUM> faces the end cover <NUM>, and is hermetically connected to one surface of the end cover <NUM>, and sides that are of the first inner wall surface <NUM> and the first outer wall surface <NUM> and that are away from the end wall surface <NUM> are hermetically connected to the first guide plate <NUM>. An adhesive is applied in an area that is of the first guide surface <NUM> of the end cover <NUM> and that is corresponding to the end wall surface <NUM>, or applied on the end wall surface <NUM>. When the end cover <NUM> is buckled on the base <NUM>, the adhesive fixedly adheres the first guide surface <NUM> and the end wall surface <NUM>, so as to hermetically connect the end wall surface <NUM> and the end cover <NUM>. In this embodiment, the flow guiding member <NUM> is integrally formed, so that sides that are of the first inner wall surface <NUM> and the first outer wall surface <NUM> and that are away from the end wall surface <NUM> can be hermetically connected to the first guide plate <NUM>.

Referring to <FIG> and <FIG>, the second sleeve <NUM> is cylindrical, and includes a second inner wall surface <NUM>, a second outer wall surface <NUM>, and a second flow guiding cavity <NUM>. The second inner wall surface <NUM> faces the second flow guiding cavity <NUM>, the second outer wall surface <NUM> faces away from the second inner wall surface <NUM>, sides that are of the first inner wall surface <NUM> and the second outer wall surface <NUM> in the Z-axis direction are hermetically connected to the second guide plate <NUM> respectively, and the other sides are respectively connected to the bottom cover <NUM>. Specifically, the flow guiding member <NUM> and the bottom cover are integrally formed, so that the first inner wall surface <NUM> and the second inner wall surface <NUM> are hermetically connected to the second guide plate <NUM> and the bottom cover <NUM>.

Referring to <FIG>, the first guide plate <NUM> is disposed around the periphery of the first sleeve <NUM>, and includes a first surface <NUM> and a second surface <NUM> that face away from each other in the Z-axis direction, and the first surface <NUM> is connected to the first outer wall surface <NUM>; and the first guide surface <NUM> and the first surface <NUM> form the first channel L1. The second guide plate <NUM> and the first guide plate <NUM> are oppositely spaced, and the second channel L2 is formed between the first guide plate <NUM> and the second guide plate <NUM>. The second guide plate <NUM> is disposed around the periphery of the second sleeve <NUM>, and includes a third surface <NUM> and a fourth surface <NUM> that face away from each other in the Z-axis direction. The third surface <NUM> is connected to the second outer wall surface <NUM>, and the fourth surface <NUM> and the second guide surface <NUM> form the third channel L3; the second surface <NUM> and the third surface <NUM> face the second channel L2, and one side that is of the first sleeve <NUM> and that is connected to the first guide plate <NUM> and one end face that is of the second sleeve <NUM> and that is connected to the second guide plate <NUM> face the second channel L2.

Referring to <FIG>, in a direction perpendicular to a Z axis, sectional areas and shapes of the first flow guiding cavity <NUM>, the second flow guiding cavity <NUM>, the first flow guiding inlet <NUM>, and the second flow guiding inlet <NUM> are the same, that is, projections of the first flow guiding cavity <NUM>, the second flow guiding cavity <NUM>, the first flow guiding inlet <NUM>, and the second flow guiding inlet <NUM> in the direction perpendicular to the Z axis coincide, so as to facilitate machining, and ensure that airflows can smoothly circulate to the first flow guiding cavity <NUM> and the second flow guiding cavity <NUM> after entering the first flow guiding inlet <NUM> and the second flow guiding inlet <NUM>, thereby increasing an air volume of an induced airflow, and preventing airflow damage due to misalignment of the cavities and the inlets.

Referring to <FIG>, and <FIG>, the connecting plate <NUM> is connected between the first guide plate <NUM> and the second guide plate <NUM>. Specifically, two sides of the connecting plate <NUM> in the Z-axis direction are respectively connected to sides that are of the first guide plate <NUM> and the second guide plate <NUM> and that face the conveying area <NUM>, so as to isolate the second channel L2 from the conveying area <NUM>, and prevent an airflow from the conveying area <NUM> from flowing into the second channel L2; sides that are of the first guide plate <NUM> and the second guide plate <NUM> and that face the air outlet <NUM> are spaced apart to form the flow guiding outlet <NUM>, and the flow guiding outlet <NUM> faces the air outlet <NUM>, so that the second channel L2 is communicated with the air outlet <NUM>. In this embodiment, the connecting plate <NUM> is a rectangular sheet to facilitate machining. Referring to <FIG>, and <FIG>, the connecting plate <NUM> extends to seal two opposite sides of the first guide plate <NUM> and the second guide plate <NUM> along a Y axis. In this case, the second channel L2 has a structure with three sides closed and one side open, and the open side is the flow guiding outlet <NUM>. In other embodiments, the connecting plate <NUM> seals only one side that is of the first channel L1 and that faces the conveying area <NUM>, and the other three sides of the second channel L2 are open. In this case, a weight of the connecting plate <NUM> is reduced, which facilitates a lightweight design of the entire fan. In other embodiments, referring to <FIG> is a schematic diagram of a partially internal structure according to another implementation of the fan shown in <FIG>. The connecting plate <NUM> is an arc-shaped sheet. In this case, one side that is of the connecting plate <NUM> and that faces away from the second channel L2 has a low resistance to a main airflow that flows through, so as to reduce losses of the main airflow. One side that is of the connecting plate <NUM> and that faces the second channel L2 has a low resistance to an induced airflow, so as to reduce losses of the induced airflow.

In this embodiment, referring to <FIG> is a schematic diagram showing an airflow in the schematic diagram of the internal structure shown in <FIG>. With reference to <FIG>, when the fan <NUM> is operating, a main airflow a formed through rotation of the blades <NUM> flows in a direction from the air duct <NUM> to the air outlet <NUM>. When flowing through the flow guiding member <NUM>, the main airflow a will bypass the connecting plate <NUM> due to blocking of the connecting plate <NUM>, and then flow into the first channel L1 and the third channel L3. Due to blocking of the connecting plate <NUM>, a volume of an available space for the main airflow a is reduced suddenly, and a flow rate of the main airflow a is increased. A part of the main airflow a entering the first channel L1 is blocked by the first outer wall surface <NUM> of the first sleeve <NUM>, so that the volume of the available space is further reduced, and the flow rate is further increased. Based on the Bernoulli's principle, when the main airflow a flowing at a high speed in the first channel L1 flows through an upper side of the flow guiding outlet <NUM>, a negative pressure area M will be formed near the flow guiding outlet <NUM>. A differential pressure exists between air pressures in the negative pressure area M and the first flow guiding cavity <NUM>. Under an action of the differential pressure, induced air enters the first flow guiding cavity <NUM> from the first flow guiding inlet <NUM>, thereby forming the first induced airflow b1. A part of the main airflow a entering the third channel L3 is blocked by the second outer wall surface <NUM> of the second sleeve <NUM>, so that the volume of the available space is further reduced, and the flow rate is further increased. Based on the Bernoulli's principle, when the main airflow a flowing at a high speed in the third channel L3 flows through a lower side of the flow guiding outlet <NUM>, a negative pressure area M will be formed near the flow guiding outlet <NUM>. A differential pressure exists between air pressures in the negative pressure area M and the second flow guiding cavity <NUM>. Under an action of the differential pressure, induced air enters the second flow guiding cavity <NUM> from the second flow guiding inlet <NUM>, thereby forming the second induced airflow b2; and after the first induced airflow b1 and the second induced airflow b2 are mixed in the second channel L2 into an induced airflow b, the induced airflow b flows to the air outlet <NUM> of the fan <NUM> along the flow guiding outlet <NUM>. When the main airflow a finally flows to the air outlet <NUM> after bypassing the first sleeve <NUM> and the second sleeve <NUM>, the main airflow a will rub against the first peripheral wall surface <NUM> and the second peripheral wall surface <NUM> that are located on two sides of the air outlet <NUM>. Under an action of friction, the main airflow a flowing at a high speed drives air around the air outlet <NUM> to generate a driven airflow c. In this case, an air output of the fan <NUM> includes three parts: the main airflow a, the induced airflow b, and the driven airflow c. Compared with a conventional component without the flow guiding member <NUM>, the air output is significantly increased, and therefore, heat dissipation efficiency is improved.

Still referring to <FIG>, <FIG> and <FIG>, in this embodiment, in the X-axis direction, the flow guiding member <NUM> is mounted in the mounting area <NUM>, and the guide area <NUM> is formed between the mounting area <NUM> and the air outlet <NUM>. In this case, the first guide plate <NUM> and the second guide plate <NUM> are retracted with respect to the air outlet to be hidden in the air duct <NUM>. Therefore, the main airflow a flows out of the first channel L1 and the third channel L3, and then needs to pass through the guide area <NUM> before reaching the air outlet <NUM>; and the induced airflow b flows out of the second channel L2, and then also needs to pass through the guide area <NUM> before reaching the air outlet <NUM>. The guide area <NUM> may guide the induced airflow b and the main airflow a to make the airflows directional, and the directional airflows can slow down losses of airflow rates and increase an air output.

Referring to <FIG>, in this embodiment, in the X-axis direction, a first convex portion <NUM> is formed in the middle of a part that is of the first guide surface <NUM> and that faces the guide area <NUM>, so that the first guide surface <NUM> is a surface with a Coanda effect. Specifically, in the X-axis direction, a part that is of the first guide surface <NUM> and that faces the air outlet area <NUM> includes a first plane section <NUM>, a first transition section <NUM>, and a first cambered section <NUM> that are sequentially connected. The first transition section <NUM> smoothly connects the first plane section <NUM> and the first cambered section <NUM>, so that the first guide surface <NUM> is smoother. The first plane section <NUM> and the first transition section <NUM> face the first channel L1, and the first cambered section <NUM> faces the guide area <NUM>. In the X-axis direction, the first cambered section <NUM> gradually inclines toward a direction close to the bottom cover <NUM>, and then gradually inclines toward a direction away from the bottom cover <NUM>, so that the first convex portion <NUM> is formed in the middle of the first guide surface <NUM> in the X-axis direction, and the first convex portion <NUM> extends in the Y-axis direction (thickness direction). Specifically, the middle is any position between two sides of the first cambered section <NUM> in the X-axis direction. Therefore, after an airflow flows out of the third channel L3 from the first channel L1, the airflow leaves an original flow direction and instead is attached to the first cambered section <NUM> to flow, so that the airflow can flow more smoothly, thereby reducing turbulence and increasing an air output.

Referring to <FIG>, in the X-axis direction, a second convex portion <NUM> is formed in the middle of a part that is of the second guide surface <NUM> and that faces the guide area <NUM>, so that the second guide surface <NUM> is a surface with a Coanda effect. Specifically, in the X-axis direction, the second guide surface <NUM> includes a second plane section <NUM>, a second transition section <NUM>, and a second cambered section <NUM> that are sequentially connected. The second transition section <NUM> smoothly connects the second plane section <NUM> and the second cambered section <NUM>, so that the second guide surface <NUM> is smoother. The second plane section <NUM> and the second transition section <NUM> face the second channel L2, and the second cambered section <NUM> faces the guide area <NUM>. In the X-axis direction, the second cambered section <NUM> gradually inclines toward a direction close to the end cover <NUM>, and then gradually inclines toward a direction away from the end cover <NUM>, so that the second convex portion <NUM> is formed in the middle of the second guide surface <NUM> in the X-axis direction, and the second convex portion <NUM> extends in the Y-axis direction. Specifically, the middle is any position between two sides of the second cambered section in the X-axis direction. Therefore, after an airflow flows out of the third channel L3 from the first channel L1, the airflow leaves an original flow direction and instead is attached to the second cambered section <NUM> to flow, so that the airflow can flow more smoothly, thereby reducing turbulence and increasing an air output.

<FIG> is a schematic diagram of a partially internal structure according to still another implementation of the fan shown in <FIG>. In this implementation, a difference from that shown in <FIG> is that both the first guide surface <NUM> and the second guide surface <NUM> are flat for easy machining.

<FIG> is a schematic diagram of a partially internal structure according to yet another implementation of the fan shown in <FIG>. In this implementation, the flow guiding member <NUM> is mounted in the air outlet area, and a size of the flow guiding member <NUM> in the X-axis direction is the same as that of the air outlet area. In this case, the first guide plate <NUM> and the second guide plate <NUM> are flush with the air outlet <NUM>. Specifically, the first guide plate <NUM> and the second guide plate <NUM> each have one side and the other side that are disposed facing away from each other in the X-axis direction. In the X-axis direction, one side of the first guide plate <NUM> and one side of the second guide plate <NUM> are aligned with one side that is of the air outlet area <NUM> and that faces the conveying area <NUM>, and the other side of the first guide plate <NUM> and the other side of the second guide plate <NUM> are aligned with the air outlet <NUM> to facilitate machining.

Referring to <FIG> and <FIG>, in this embodiment, in the direction perpendicular to the Z axis, the first outer wall surface <NUM> of the first sleeve <NUM> is arc-shaped, so that the first outer wall surface <NUM> has a low resistance to a part of the main airflow a flowing in the first channel L1 to ensure that the main airflow a entering the first channel L1 has a high flow rate. In this way, a difference between air pressures in the negative pressure area M and the first flow guiding cavity <NUM> is large, and an air volume of the first induced airflow b1 is large. Therefore, the air output is increased to further improve the heat dissipation efficiency. Specifically, in this embodiment, in the direction perpendicular to the Z axis, the first outer wall surface <NUM> is streamlined, a relatively round part of the first outer wall surface <NUM> faces the conveying area <NUM> of the air duct <NUM>, and a relatively sharp part faces the air outlet <NUM>. In other embodiments, in the direction perpendicular to the Z axis, the first outer wall surface <NUM> is elliptical or circular.

Referring to <FIG>, in the direction perpendicular to the Z axis, the second outer wall surface <NUM> of the second sleeve <NUM> is arc-shaped, so that the second outer wall surface <NUM> has a low resistance to a part of the main airflow a flowing in the third channel L3 to ensure that the main airflow a entering the third channel L3 has a high flow rate. In this way, a difference between air pressures in the negative pressure area M and the second flow guiding cavity <NUM> is large, and an air volume of the second induced airflow b2 is large. Therefore, the air output is increased to further improve the heat dissipation efficiency. Specifically, in this embodiment, in the direction perpendicular to the Z axis, the second outer wall surface <NUM> is streamlined, and a relatively round part of the second outer wall surface <NUM> faces the conveying area <NUM> of the air duct <NUM>, and a relatively sharp part faces the air outlet <NUM>. In other embodiments, in the direction perpendicular to the Z axis, the second outer wall surface <NUM> is elliptical or circular.

Referring to <FIG> and <FIG>, in this embodiment, there are a plurality of first sleeves <NUM>, where "a plurality of" means two or more. A specific quantity of the first sleeves <NUM> may be determined based on a quantity of the body <NUM>. A larger size of the body <NUM> in the Y-axis direction indicates that more first sleeves <NUM> may be provided. On the contrary, a smaller size of the body <NUM> in the Y-axis direction indicates that fewer first sleeves <NUM> may be provided correspondingly. Specifically, a plurality of first sleeves <NUM> are equally spaced apart in the Y-axis direction, and the main airflow a entering the first channel L1 flows through two adjacent first sleeves <NUM> in a plurality of streams, so as to increase a flow rate of the main airflow a flowing in the first channel L1, increase a differential pressure between the negative pressure area M and the first flow guiding cavity <NUM>, increase an air volume of the first induced airflow b1, and further increase a total air output. The plurality of first sleeves <NUM> are equally spaced apart, so that a part of the main airflow a entering the first channel L1 is evenly divided into a plurality of streams, and when the plurality of streams of main airflow finally converge at the air outlet <NUM>, an air volume of the entire airflow is relatively uniform, so that heat may be uniformly dissipated from all parts of the fins, thereby improving a heat dissipation effect. In other embodiments, the plurality of first sleeves <NUM> are randomly distributed in the Y-axis direction, or are randomly distributed along the X axis. In other embodiments, the fan <NUM> includes a first sleeve <NUM> to simplify a structure of the fan <NUM> and reduce a weight of the fan <NUM>.

Similarly, there are a plurality of second sleeves <NUM>, where "a plurality of" means two or more. A specific quantity of the second sleeves <NUM> may be determined based on a quantity of the body <NUM>. A larger size of the body <NUM> in the Y-axis direction indicates that more second sleeves <NUM> may be provided. On the contrary, a smaller size of the body <NUM> in the Y-axis direction indicates that fewer second sleeves <NUM> may be provided correspondingly. Specifically, a plurality of second sleeves <NUM> are equally spaced apart in the Y-axis direction, and a part of the main airflow a entering the third channel L3 flows through two adjacent second sleeves <NUM> in a plurality of streams, so as to increase a flow rate of the main airflow a flowing in the third channel L3, increase a differential pressure between the negative pressure area M and the second flow guiding cavity <NUM>, increase an air volume of the second induced airflow b2, and further increase a total air output. The plurality of second sleeves <NUM> are equally spaced apart, so that a part of the main airflow a entering the second channel L2 is evenly divided into a plurality of streams, and when the plurality of streams of main airflow finally converge at the air outlet <NUM>, an air volume of the entire airflow is relatively uniform, so that heat may be uniformly dissipated from all parts of the fins, thereby improving a heat dissipation effect. In other embodiments, the plurality of second sleeves <NUM> are randomly distributed in the Y-axis direction, or are randomly distributed along the X axis. In other embodiments, the fan <NUM> includes a second sleeve <NUM> to simplify a structure of the fan <NUM> and reduce a weight of the fan <NUM>.

In other embodiments, referring to <FIG> and <FIG>, <FIG> is a schematic diagram of a structure of a fan according to another embodiment of this application; and <FIG> is a schematic diagram of a structure of the fan shown in <FIG> from another perspective. Differences from the embodiment shown in <FIG> are that the first flow guiding inlet <NUM> is only disposed on the end cover <NUM>, and the first sleeve <NUM> is disposed between the end cover <NUM> and the first guide plate <NUM>. The end wall surface <NUM> of the first sleeve <NUM> is bonded or fixedly welded to the first guide surface, so that the first sleeve <NUM> and the end cover are sealed and fixedly connected. In this case, the flow guiding member <NUM> is fastened by a fixing force between the end wall surface <NUM> and the first guide surface. Differences from the embodiment shown in <FIG> are that the second flow guiding inlet is not disposed on the bottom cover <NUM>, and the second sleeve <NUM> is not disposed between the bottom cover and the second guide plate <NUM>, so as to simplify a structure of the flow guiding member <NUM> and reduce a weight of the fan.

In other embodiments, the second flow guiding inlet <NUM> is only disposed on the bottom cover <NUM>, and the second sleeve <NUM> is disposed between the bottom cover <NUM> and the second guide plate <NUM>. Differences from the embodiment shown in <FIG> are that the first flow guiding inlet is not disposed on the end cover <NUM>, and the first sleeve <NUM> is not disposed between the end cover <NUM> and the first guide plate <NUM>, so as to simplify a structure of the flow guiding member <NUM> and reduce a weight of the fan.

Claim 1:
A fan (<NUM>) for an electronic device (<NUM>), the fan comprising a body (<NUM>), wherein an air duct (<NUM>), an air outlet (<NUM>) and a flow guiding inlet (<NUM>, <NUM>) that is communicated with the outside are formed in the body; and the air duct (<NUM>) comprises an air inlet area (<NUM>) and an air outlet area (<NUM>) that are sequentially distributed and communicated in a length direction of the fan (<NUM>), the air outlet area (<NUM>) is corresponding to the air outlet (<NUM>) and is communicated with the air outlet (<NUM>), and a flow guiding member (<NUM>) is disposed in the air outlet area (<NUM>);
the flow guiding member (<NUM>) comprises a first guide plate (<NUM>), a second guide plate (<NUM>), and a sleeve (<NUM>, <NUM>), a first channel (L1) is formed between the first guide plate (<NUM>) and an inner wall of the air duct (<NUM>), the first guide plate (<NUM>) and the second guide plate (<NUM>) are oppositely spaced apart to form a second channel (L2), and a third channel (L3) is formed between the second guide plate (<NUM>) and the inner wall of the air duct (<NUM>); the first channel (L1), the second channel (L2), and the third channel (L3) are sequentially disposed in a thickness direction of the fan (<NUM>); the sleeve (<NUM>, <NUM>) is disposed in the first channel (L1) and/or the third channel (L3), and the sleeve (<NUM>, <NUM>) comprises a flow guiding cavity (<NUM>, <NUM>); and one side that is of the second channel (L2) and that faces the air inlet area (<NUM>) is isolated from the air inlet area (<NUM>), one side that is of the second channel (L2) and that faces away from the air inlet area (<NUM>) forms a flow guiding outlet (<NUM>), and the flow guiding outlet (<NUM>) and the air outlet (<NUM>) face the same direction and are communicated; and
in the length direction of the fan (<NUM>), the air inlet area (<NUM>), the first channel (L1), and the air outlet (<NUM>) are sequentially communicated, and the air inlet area (<NUM>), the third channel (L3), and the air outlet (<NUM>) are sequentially communicated; and in the thickness direction of the fan (<NUM>), the flow guiding inlet (<NUM>, <NUM>), the flow guiding cavity (<NUM>, <NUM>), and the second channel (L2) are sequentially communicated.