CN111456951A - Laminar flow fan - Google Patents

Abstract

The present invention provides a laminar flow fan. The laminar flow fan includes: a plurality of annular disks, which are arranged in parallel with each other and have the same central axis; the circular disks are formed with a hub facing the center of the plurality of annular disks, and a groove is defined inside the hub; a connecting piece , connect a plurality of annular discs to the circular disc; a motor is arranged in the groove, and the motor directly drives the circular disc to rotate, and then the circular disc drives the plurality of annular discs to rotate, so as to use the viscous effect to form a layer Air flow; the bottom wall of the hub is provided with a heat dissipation port, and the air entering the groove through the heat dissipation port dissipates the heat generated by the operation of the motor. The laminar flow fan of the present invention realizes laminar flow air supply through the viscous effect, with low noise and high air volume in the air supply process; making full use of the air entering the groove through the cooling port to dissipate the heat of the generator, which can further improve the working efficiency of the laminar flow fan.

Description

Laminar flow fan

technical field

The invention relates to the technical field of household appliances, in particular to a laminar flow fan.

Background technique

With the development of society and the continuous improvement of people's living standards, various air conditioning devices have become one of the indispensable electrical equipment in people's daily life. Various air conditioning devices can help people reach a temperature that they can adapt to when the ambient temperature is too high or too low.

The current air conditioners mainly include various types of air conditioners and fans, but most users believe that the hot air or cold air generated by the current air conditioners is unevenly distributed in a room or a closed space, and has certain distribution limitations. In addition, the fans used in the indoor unit of the air conditioner are mainly centrifugal fans and cross-flow fans. However, centrifugal fans and cross-flow fans have the following problems: because the centrifugal fan needs dozens of large-volume blades to increase the air pressure and air volume, the centrifugal fan is noisy, and when the centrifugal fan is used in a vertical air conditioner, the air flows from From entering the centrifugal fan to sending out the air conditioner, two 90° direction turns are required, and each time the direction turns, there will be a loss of air volume; although the cross-flow fan has low noise, the air pressure is too small and the air supply distance is short. In addition, the overall volume of the cross-flow fan is large, but the actual effective volume is small, resulting in a waste of space. In addition, the heat generated by the centrifugal fan and the cross-flow fan during operation is not easy to dissipate, which often affects the working efficiency of the motor.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a laminar flow fan with low noise and high air volume.

A further object of the present invention is to dissipate the heat of the laminar flow fan motor in time to improve the working efficiency of the laminar flow fan.

In particular, the present invention provides a laminar flow fan, comprising: a plurality of annular disks, which are arranged in parallel with each other and have the same central axis; side, and the center of the circular disc faces the plurality of annular discs, a hub is formed, and a groove is defined inside the hub; and a connecting piece passes through the circular disc and the plurality of annular discs to connect the plurality of annular discs to the circular disc; wherein, a motor is arranged in the groove, and the motor directly drives the circular disc to rotate, and then the circular disc drives a plurality of annular discs to rotate, so as to use the viscous effect to form laminar airflow; the bottom wall of the hub A heat dissipation port is provided, and the air entering the groove through the heat dissipation port dissipates the heat generated by the operation of the motor.

Optionally, a plurality of cooling vents are provided and are provided along the edge of the bottom wall of the wheel hub at even intervals.

Optionally, the centers of the plurality of annular disks are jointly formed with an air inlet channel, so as to allow the air outside the laminar flow fan to enter.

Optionally, a plurality of air outlets are formed in the gaps between the plurality of annular discs, so that the laminar flow air can be blown out.

Optionally, the inner diameters of the plurality of annular disks gradually decrease from one side away from the circular disks to the other side.

Optionally, each annular disk is an arc-shaped disk that gradually rises from the inside to the outside and protrudes upward.

Optionally, the central angle of the line connecting the inner and outer diameters of the plurality of annular disks on the same longitudinal section passing through the central axis is 9° to 30°.

Optionally, the chord length of the connecting piece gradually increases from one side away from the circular disk to the other side.

Optionally, a plurality of connecting pieces are provided and run through the circular disk and the plurality of annular disks at even intervals.

Optionally, the radius of the circular disk is the same as the outer diameter of the plurality of annular disks.

The laminar flow fan of the present invention includes: a plurality of annular discs, which are arranged parallel to each other and have the same central axis; circular discs are arranged parallel to one side of the plurality of annular discs at intervals, and the circular discs the center of the disc is formed with a hub toward the plurality of annular discs, the hub defines a groove inside; and a connecting piece penetrating the circular disc and the plurality of annular discs to connect the plurality of annular discs to the circular disc; Wherein, a motor is arranged in the groove, and the motor directly drives the circular disc to rotate, and then the circular disc drives a plurality of annular discs to rotate, so as to form laminar airflow by utilizing the viscous effect; The air entering the groove from the cooling vent dissipates the heat generated by the operation of the motor. The laminar flow fan realizes laminar flow air supply through the viscous effect, with low noise and high air volume during the air supply process, which effectively improves the user experience; making full use of the air entering the groove through the cooling port to dissipate the heat of the generator can improve the work of the laminar flow fan efficiency.

Further, in the laminar flow fan of the present invention, the inner diameters of the plurality of annular discs gradually decrease from one side away from the circular discs to the other side; each annular disc gradually rises from the inside to the outside and protrudes upwards. The central angle of the connecting line between the inner and outer diameters of multiple annular discs on the same longitudinal section passing through the central axis is 9° to 30°, so that the angle of the outside air entering the laminar flow fan is more in line with the fluid flow, Therefore, it is more conducive for the external air to enter the laminar flow fan, effectively reducing the loss of air volume, and ensuring that the air output of the laminar flow fan meets the user's needs.

The above and other objects, advantages and features of the present invention will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of example and not limitation with reference to the accompanying drawings. The same reference numbers in the figures designate the same or similar parts or parts. It will be understood by those skilled in the art that the drawings are not necessarily to scale. In the attached picture:

Fig. 1 is the air supply schematic diagram of centrifugal fan in the prior art;

2 is a schematic diagram of the overall structure of a laminar flow fan according to an embodiment of the present invention;

3 is a schematic diagram of the overall structure of the laminar flow fan in FIG. 2 from another perspective;

Fig. 4 is the overall structure schematic diagram of the laminar flow fan in Fig. 2 from another perspective;

Fig. 5 is the air circulation schematic diagram of the laminar flow fan in Fig. 2;

6 is a schematic diagram of the air supply principle of a laminar flow fan according to an embodiment of the present invention;

7 is a speed distribution and force distribution diagram of a laminar flow fan according to an embodiment of the present invention;

8 is a partial cross-sectional view of a laminar flow fan with gradual inner diameters of a plurality of annular discs;

Figure 9 is a schematic diagram of the relationship between the gradual change in the inner diameter of a plurality of annular discs of the laminar flow fan in Figure 8 and the air volume and air pressure;

10 is a schematic diagram of the central angle of a line connecting the inner and outer diameters of a plurality of annular disks of a laminar flow fan on the same longitudinal section passing through the central axis according to an embodiment of the present invention; and

FIG. 11 is a schematic diagram showing the relationship between the central angle of the circle and the air volume and air pressure in FIG. 10 .

Detailed ways

FIG. 1 is a schematic diagram of air supply of a centrifugal fan 200 in the prior art. The two arrows in FIG. 1 show the direction of air flow during the air supply process of the centrifugal fan 200 when applied to a vertical air conditioner. When the centrifugal fan 200 in the prior art is applied to a vertical air conditioner, The whole process of air outlet requires two 90° turns, and each turn will be accompanied by more air volume loss. In addition, the centrifugal fan 200 generally needs dozens of large-volume blades to increase the wind pressure and air volume. When the centrifugal fan 200 is working, the blades rotate to generate friction or impact with the air. The blades of the centrifugal fan 200 are wider and thicker, so when the motor of the centrifugal fan 200 runs at a high speed, a very large noise will be generated. In addition, cross-flow fans are also commonly used in the prior art, but although the noise of cross-flow fans is low, the wind pressure is too small and the air supply distance is short; and the overall volume of cross-flow fans is large, but the actual effective volume is small, resulting in a waste of space .

This embodiment provides a laminar flow fan, which utilizes the viscous effect to achieve laminar air supply, with low noise and high air volume during the air supply process, effectively improving the user experience; making full use of the air entering the groove through the heat dissipation port to dissipate the heat of the generator , which can further improve the working efficiency of the laminar flow fan. FIG. 2 is a schematic diagram of the overall structure of the laminar flow fan 100 according to an embodiment of the present invention, FIG. 3 is a schematic diagram of the overall structure of the laminar flow fan 100 in FIG. 2 from another perspective, and FIG. 4 is the overall structure of the laminar flow fan 100 in FIG. 2 from another perspective. Schematic diagram of the structure, FIG. 5 is a schematic diagram of the air circulation of the laminar flow fan 100 in FIG. 2 . As shown in FIGS. 2 to 5 , the laminar flow fan 100 of the present embodiment may generally include: a plurality of annular disks 10 , circular disks 30 and connecting pieces 40 .

Wherein, a plurality of annular disks 10 can be arranged in parallel with each other and have the same central axis. The circular disks 30 may be arranged parallel to one side of the plurality of annular disks 10 at intervals, and a hub 301 is formed in the center of the circular disk 30 toward the plurality of annular disks 10 , and a groove 305 is defined inside the hub 301 . The circular disk 30 and the plurality of annular disks 10 may have the same central axis. The connecting piece 40 may penetrate the circular disc 30 and the plurality of annular discs 10 to connect the plurality of annular discs 10 to the circular disc 30 .

A motor (not shown in the figure) may be provided in the groove 305, and the motor directly drives the circular disk 30 to rotate, and then the circular disk 30 drives the plurality of annular disks 10 to rotate, so as to form laminar airflow by utilizing the viscous effect. The laminar flow fan 100 realizes laminar air supply through the viscous effect, with low noise and high air volume during the air supply process, which effectively improves the user experience. The bottom wall of the hub 301 is provided with a heat dissipation port 303, and the air entering the groove 305 through the heat dissipation port 303 dissipates the heat generated by the operation of the motor.

In a specific embodiment, a plurality of cooling vents 303 may be provided, and may be provided along the edge of the bottom wall of the wheel hub 301 at even intervals. The specific number and size of the heat dissipation ports 303 can be set according to actual needs and the area of the bottom wall of the hub 301 . The bottom of the wheel hub 301 is provided with a plurality of cooling ports 303 , which can not only realize the air intake in the grooves 305 , but also reduce the weight of the laminar flow fan 100 and effectively reduce the cost.

FIG. 6 is a schematic diagram of the air supply principle of the laminar flow fan 100 according to an embodiment of the present invention, and FIG. 7 is a speed distribution and force distribution diagram of the laminar flow fan 100 according to an embodiment of the present invention. The air supply principle of the laminar flow fan 100 is mainly derived from the "Tesla turbine" discovered by Nikola Tesla. The Tesla turbine mainly uses the "laminar boundary layer effect" or "viscous effect" of the fluid to achieve the purpose of doing work on the "turbine disc". The laminar flow fan 100 of the present embodiment drives the circular disc 30 by a motor, and the circular disc 30 drives the plurality of annular discs 10 to rotate at a high speed. Due to the action of the viscous shear force τ, the air boundary layer 13 on the surface is driven by the rotating disc to rotate and move from the inside to the outside to form a laminar airflow. The air boundary layer 13 refers to a thin air layer near the surface of each disc.

FIG. 7 shows a schematic diagram of the viscous shear force distribution τ(y) and the velocity distribution u(y) on the air boundary layer 13 . The viscous shear force on the air boundary layer 13 is actually the resistance generated by each disk to the air boundary layer 13 . The abscissa axis in FIG. 6 refers to the distance in the moving direction of the air boundary layer 13 , and the ordinate axis refers to the height of the air boundary layer 13 in the direction perpendicular to the moving direction. ve is the airflow velocity at each point in the air boundary layer 13 , δ is the thickness of the air boundary layer 13 , and τw is the viscous shear force at the surface of the annular disk 10 . The variable y in τ(y) and u(y) refers to the height of the cross section of the air boundary layer 13 in the direction perpendicular to the moving direction, and L is a certain point on the inner circumference of the annular disk 10 and a certain point on the surface of the annular disk 10. distance between points. Then τ(y) is the viscous shear force distribution at the distance L, when the height of the air boundary layer 13 section is y; u(y) is at the distance L, the height of the air boundary layer 13 section is y speed distribution at time.

As shown in FIG. 2 to FIG. 5 , an air inlet channel 11 is formed in the centers of the plurality of annular disks 10 , so that the air outside the laminar flow fan 100 can enter. A plurality of air outlets 12 are formed in the gaps between the plurality of annular discs 10 for the laminar flow to be blown out. It should be noted that the process in which the air boundary layer 13 rotates from the inside to the outside to form laminar wind is centrifugal motion, so the speed when leaving the air outlet 12 is greater than the speed when entering the air inlet channel 11 . The pressure difference between the air outlet 12 of the laminar flow fan 100 and the inlet of the air inlet channel 11 is the wind pressure.

The arrows in FIG. 5 specifically show the process that the air outside the laminar flow fan 100 of the present embodiment enters the laminar flow fan 100 . The air outside the laminar flow fan 100 first enters the air inlet channel 11 , and then a part directly enters between the plurality of annular discs 10 , forming laminar flow air and blows out through the plurality of air outlets 12 ; another part enters through the heat dissipation port 303 at the bottom of the hub 301 . In the groove 305 , the air in the groove 305 can effectively dissipate the heat generated by the working of the generator, and dissipate the heat to the side of the circular disk 30 away from the annular disk 10 . The heat generated when the motor is working is released in time, which can further improve the working efficiency of the laminar flow fan 100 .

8 is a partial cross-sectional view of the laminar flow fan 100 with the inner diameters of the plurality of annular discs 10 gradually changing, and FIG. In a preferred embodiment, the inner diameters of the plurality of annular disks 10 gradually decrease from one side away from the circular disks 30 to the other side. As the inner diameters of the plurality of annular disks 10 gradually decrease from one side away from the circular disks 30 to the other side, the air volume of the laminar flow fan 100 will be effectively increased, so that the air output of the laminar flow fan 100 can meet the needs of users. . In a preferred embodiment, the inner diameters of two adjacent annular discs 10 vary by the same amount, that is, the inner diameters of the plurality of annular discs 10 decrease from one side away from the circular disc 30 to the other side values are the same.

In FIG. 9 , the shrinking uniform expanding Inner radius increase on the abscissa axis refers to the change between the inner diameter of each annular disk 10 and the inner diameter of the adjacent annular disk 10 below. The left ordinate axis Massflow rate refers to the air volume. The ordinate axis Pressure rise refers to the wind pressure. Specifically, FIG. 9 shows that when the outer diameter, spacing, quantity, thickness, and rotational speed of the motor of the annular discs 10 of the laminar flow fan 100 remain unchanged, the inner diameters of the plurality of annular discs 10 change gradually with the air volume and air pressure. Relationship diagram. like

As shown in FIG. 9 , when the parameters mentioned above remain unchanged, the inner diameters of the plurality of annular discs 10 gradually change from one side away from the circular discs 30 to the other side, which has a greater impact on the air volume, and has a greater impact on the air volume. pressure has little effect. When the variation between the inner diameter of each annular disk 10 represented by the abscissa axis and the inner diameter of the adjacent annular disk 10 on the side away from the circular disk 30 is a positive number, it means that the inner diameters of the plurality of annular disks 10 are determined by It gradually increases from one side away from the circular disc 30 to the other side; when the inner diameter of each annular disc 10 represented by the abscissa axis changes with the inner diameter of the adjacent annular disc 10 on the side away from the circular disc 30 When the amount is a negative number, it means that the inner diameters of the plurality of annular disks 10 gradually decrease from one side away from the circular disk 30 to the other side.

It can be seen from FIG. 9 that when the inner diameters of the plurality of annular discs 10 gradually decrease from one side away from the circular discs 30 to the other side, the air volume of the laminar flow fan 100 increases and the air pressure decreases slightly; When the inner diameter of the annular disk 10 gradually increases from one side away from the circular disk 30 to the other side, the wind pressure of the laminar flow fan 100 increases slightly, and the air volume decreases a lot. Therefore, comprehensively considering the air volume and air pressure of the laminar flow fan 100 , the inner diameters of the plurality of annular disks 10 are set to gradually decrease from one side away from the circular disk 30 to the other side.

In a preferred embodiment, the outer diameter of the annular discs 10 of the laminar flow fan 100 is 175 mm, the distance between the annular discs 10 is 13.75 mm, the number of annular discs 10 is 8, and the thickness of the annular discs 10 is 2mm, and the rotational speed of the motor is 1000rpm (revolutions per minute, revolutions per minute). At this time, considering the overall consideration of the air volume and air pressure of the laminar flow fan 100, it is possible to set the inner diameter of each annular disc 10 to be the same as the adjacent one below. The variation in the inner diameter of the annular disk 10 is -5 mm. That is, the inner diameters of the eight annular discs 10 can be set in sequence from one side away from the circular disc 30 to the other side: 115 mm, 110 mm, 105 mm, 100 mm, 95 mm, 90 mm, 85 mm, 80 mm mm, the inner diameter of each annular disk 10 is smaller than the inner diameter of the adjacent annular disk 10 below by 5 mm. It should be noted that the space between the annular disks 10 in the above specifically refers to the space between two adjacent annular disks 10 . Moreover, it should be emphasized that the inner diameters of the plurality of annular discs 10 gradually decrease from one side away from the circular discs 30 to the other side. The inner diameter of the annular disk 10 is gradually reduced.

The inner diameters of the plurality of annular discs 10 in the previous embodiment gradually decrease from one side away from the circular disc 30 to the other side. On this basis, each annular disc 10 may be gradually reduced from the inside to the outside. A raised and upwardly convex curved platter. Compared with the flat disk, the arc-shaped disk can make the angle of the outside air entering the laminar flow fan 100 more in line with the fluid flow, which is more conducive to the outside air entering the laminar flow fan 100 and effectively reduces the loss of air volume. 10 is a schematic diagram of the central angle θ of the line connecting the inner and outer diameters of the plurality of annular disks 10 of the laminar flow fan 100 on the same longitudinal section passing through the central axis according to an embodiment of the present invention, and FIG. 11 is a

A schematic diagram of the relationship between the central angle θ and the air volume and air pressure in FIG. 10 . As shown in FIG. 10 , the inner diameters of the plurality of annular discs 10 gradually decrease from one side away from the circular disc 30 to the other side, and each annular disc 10 is gradually raised from the inside to the outside and protrudes upward. curved disc. A central angle θ is formed on a line connecting the inner and outer diameters of the plurality of annular disks 10 on the same longitudinal section passing through the central axis.

The abscissa axis θ in FIG. 11 refers to the central angle of the line connecting the inner and outer diameters of the plurality of annular discs 10 on the same longitudinal section passing through the central axis, the left ordinate axis Mass flow rate refers to the air volume, the right ordinate axis Pressure rise refers to the wind pressure. Specifically, FIG. 11 shows a schematic diagram of the relationship between the central angle θ and the air volume and air pressure when the outer diameter, number of layers, spacing, thickness, and motor speed of the annular discs 10 of the laminar flow fan 100 remain unchanged. As shown in FIG. 11 , when the above-mentioned parameters remain unchanged, as the central angle θ gradually increases, the air volume of the laminar flow fan 100 first increases and then decreases, while the air pressure slightly increases. In a preferred embodiment, the outer diameter of the annular disc 10 of the laminar flow fan 100 is 175 mm, the number of layers of the annular disc 10 is 10, the distance between the annular discs 10 is 13.75 mm, and the The thickness is 2mm, and the speed of the motor is 1000rpm (revolutions per minute, revolutions per minute). At this time, considering the air volume and air pressure, the center of the circle connecting the inner and outer diameters of the plurality of annular discs 10 on the same longitudinal section passing through the central axis The angle θ can be set to 9° to 30°. And as shown in FIG. 11 , when the central angle θ is set to 15°, the air volume of the laminar flow fan 100 reaches the maximum value.

Corresponding to the inner diameter of the plurality of annular discs 10 gradually decreasing from one side away from the circular disc 30 to the other side, the chord length of the connecting piece 40 gradually increases from one side away from the circular disc 30 to the other side . The cross section of the connecting piece 40 has two curves arranged in sequence along the rotation direction of the annular disc 10 , and the chord length of the two curves is the chord length. A plurality of connecting pieces 40 can be provided, and run through the circular disc 30 and the plurality of annular discs 10 at even intervals, which can ensure a stable connection between the circular disc 30 and the plurality of annular discs 10, thereby ensuring that the When the motor drives the circular disc 30 to rotate, the circular disc 30 can stably drive the plurality of annular discs 10 to rotate, thereby improving the working reliability of the laminar flow fan 100 .

In a specific embodiment, the radius of the circular disc 30 is the same as the outer diameter of the plurality of annular discs 10. It should be noted that the inner diameter of the annular disc 10 refers to the radius of its inner circumference; the outer diameter Refers to the radius of its outer circumference. The laminar flow fan 100 of this embodiment can not only be used alone to supply air, more importantly, the laminar flow fan 100 can also be applied to various types of indoor units of air conditioners, such as vertical air conditioners and wall-mounted air conditioners Wait. Considering the limited internal space of the indoor unit of the air conditioner, the overall volume of the laminar flow fan 100 needs to be constrained to a certain extent. In the transverse direction, the radius of the circular disk 30 and the outer diameter of the annular disk 10 can be constrained; in the longitudinal direction, the distance between the plurality of annular disks 10 and the thickness and number of the annular disks 10 can be constrained. constraint.

The spacing between every two adjacent annular disks 10 of the multiple annular disks 10 in this embodiment may be the same, that is, the multiple annular disks 10 are arranged in parallel with each other at the same spacing. The plurality of air outlets 12 formed by the gaps between the plurality of annular discs 10 can enable the laminar flow fan 100 to achieve 360° uniform air supply, avoid various discomfort symptoms caused by the user due to the direct blowing of the air by the air conditioner, and further improve the User experience.

The laminar flow fan 100 of this embodiment includes: a plurality of annular discs 10 , which are arranged parallel to each other and have the same central axis; and circular discs 30 are arranged parallel to one side of the plurality of annular discs 10 at intervals , and the center of the circular disc 30 is formed with a hub 301 toward the plurality of annular discs 10, and a groove 305 is defined inside the hub 301; The plurality of annular discs 10 are connected to the circular disc 30; wherein, a motor is provided in the groove 305, and the motor directly drives the circular disc 30 to rotate, and then the circular disc 30 drives the plurality of annular discs 10 to rotate , so as to utilize the viscous effect to form laminar air; the bottom wall of the hub 301 is provided with a heat dissipation port 303 , and the air entering the groove 305 through the heat dissipation port 303 dissipates the heat generated by the operation of the motor. The laminar flow fan 100 realizes laminar air supply through the viscous effect, with low noise and high air volume during the air supply process, which effectively improves the user experience; fully utilizes the air entering the groove 305 through the heat dissipation port 303 to dissipate the heat of the generator, and can enter the lifting layer The efficiency of the flow fan.

Further, in the laminar flow fan 100 of this embodiment, the inner diameters of the plurality of annular discs 10 gradually decrease from one side away from the circular disc 30 to the other side; each annular disc 10 is gradually reduced from the inside to the outside The arc-shaped disc that is raised and raised upward; the central angle θ of the line connecting the inner and outer diameters of the plurality of annular discs 10 on the same longitudinal section passing through the central axis is 9° to 30°, so that the outside air enters the laminar flow fan The angle of the 100 is more in line with the fluid flow, which is more conducive to the entry of external air into the laminar flow fan 100 , effectively reducing the loss of air volume, and ensuring that the air outlet of the laminar flow fan 100 meets the user's use requirements.

Those skilled in the art should understand that, unless otherwise specified, the terms "up", "down", "left", "right", "front" and "rear" in the embodiments of the present invention are used to represent The terms of orientation or positional relationship are based on the actual use state of the laminar flow fan 100, and these terms are only for the convenience of describing and understanding the technical solutions of the present invention, rather than indicating or implying that the device or component referred to must have The specific orientation is therefore not to be construed as a limitation of the present invention.

By now, those skilled in the art will recognize that, although various exemplary embodiments of the present invention have been illustrated and described in detail herein, the present invention may still be implemented in accordance with the present disclosure without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications consistent with the principles of the invention. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A laminar flow fan, comprising: a plurality of annular discs, spaced apart and parallel to each other and having the same central axis; circular disks, which are arranged parallel to one side of the plurality of annular disks at intervals, and a hub is formed in the center of the circular disk toward the plurality of annular disks, and a groove is defined inside the hub ;as well as a connecting piece penetrating the circular disc and the plurality of annular discs to connect the plurality of annular discs to the circular disc; Wherein, a motor is provided in the groove, and the motor directly drives the circular disc to rotate, and then the circular disc drives the plurality of annular discs to rotate, so as to utilize the viscous effect to form laminar airflow; The bottom wall of the hub is provided with a heat dissipation port, and the air entering the groove through the heat dissipation port dissipates the heat generated by the operation of the motor. 2. The laminar flow fan of claim 1, wherein, There are a plurality of the heat dissipation ports, and they are evenly spaced along the edge of the bottom wall of the wheel hub. 3. The laminar flow fan of claim 1, wherein, An air inlet channel is formed in the center of the plurality of annular disks, so that the air outside the laminar flow fan can enter. 4. The laminar flow fan of claim 1, wherein, A plurality of air outlets are formed in the gaps between the plurality of annular discs, so that the laminar flow air can be blown out. 5. The laminar flow fan of claim 1, wherein, The inner diameters of the plurality of annular disks gradually decrease from one side away from the circular disks to the other side. 6. The laminar flow fan of claim 5, wherein, Each of the annular disks is an arc-shaped disk that gradually rises from the inside to the outside and protrudes upwards. 7. The laminar flow fan of claim 6, wherein, The central angle of the line connecting the inner and outer diameters of the plurality of annular disks on the same longitudinal section passing through the central axis is 9° to 30°. 8. The laminar flow fan of claim 5, wherein, The chord length of the connecting piece gradually increases from one side away from the circular disk to the other side. 9. The laminar flow fan of claim 1, wherein, There are a plurality of the connecting plates, and the connecting plates are evenly spaced through the circular disks and the plurality of annular disks. 10. The laminar flow fan of claim 1, wherein, The radius of the circular disk is the same as the outer diameter of the plurality of annular disks.

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