CN209818346U - Laminar flow fan - Google Patents

Abstract

The utility model provides a laminar flow fan. Wherein laminar flow fan includes: a plurality of annular disks disposed in parallel spaced apart from each other and having the same central axis; a circular disk, wherein a hub is formed at the center of the circular disk towards the plurality of annular disks, and a groove is defined in the hub; a connecting sheet connecting the plurality of annular disks to the circular disk; a motor is arranged in the groove, the motor directly drives the circular disk to rotate, and then the circular disk drives the plurality of annular disks to rotate so as to form laminar air by utilizing the viscous effect; the outer side of the peripheral wall of the hub is provided with a flow deflector parallel to the annular discs so as to guide the air in the groove to the space between the annular discs through a plurality of outlets on the peripheral wall of the hub by using a viscous effect during rotation. The laminar flow fan of the utility model realizes laminar air supply through the viscous effect, and has low noise and high air volume in the air supply process; the flow deflector improves the amount of wind entering the laminar flow fan, thereby improving the working efficiency of the laminar flow fan.

Description

Laminar flow fan

Technical Field

The utility model relates to the technical field of household appliances, especially, relate to a laminar flow fan.

Background

With the development of society and the increasing living standard of people, various air conditioning devices have become one of the indispensable electrical devices in people's daily life. Various air conditioning devices can help people to reach a temperature that can be adapted to when the ambient temperature is too high or too low.

The current air conditioning devices mainly include various types of air conditioners and fans, but most users consider that 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, fans used in indoor units of air conditioners are mainly centrifugal fans and cross-flow fans. However, the centrifugal fan and the cross flow fan have the following problems: the centrifugal fan has high noise because the wind pressure and the wind volume are improved by dozens of large-volume blades, and when the centrifugal fan is used for a vertical air conditioner, the air needs to be bent in two directions of 90 degrees from the air entering the centrifugal fan to the air being sent out of the air conditioner, and the wind loss is caused when the air is bent in each direction; although the noise of the cross flow fan is low, the wind pressure is too small, and the air supply distance is short. And the whole volume of the cross flow fan is large, and the actual effective volume is small, so that the space waste is caused. In addition, the heat generated by the centrifugal fan and the cross-flow fan during operation is not easy to dissipate, and the working efficiency of the motor is often affected.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a laminar flow fan that the noise is little, the amount of wind is high.

The utility model discloses a further purpose is in time to distribute laminar flow fan motor's heat, promotes laminar flow fan's work efficiency.

In particular, the utility model provides a laminar flow fan, include: a plurality of annular disks disposed in parallel spaced apart from each other and having the same central axis; the circular disks are arranged on one sides of the annular disks at intervals in parallel, hubs are formed at the centers of the circular disks towards the annular disks, and grooves are defined in the hubs; the connecting piece penetrates through the circular disk and the annular disks to connect the annular disks to the circular disk; the groove is internally provided with a motor which directly drives the circular disk to rotate, and then the circular disk drives the plurality of annular disks to rotate so as to form laminar air by utilizing the viscous effect; one or more groups of guide vanes parallel to the annular disks are arranged outside the peripheral wall of the hub so as to guide the air in the groove to the annular disks through a plurality of outlets on the peripheral wall of the hub by utilizing a viscous effect when rotating, wherein the plurality of outlets are formed by gaps among the plurality of guide vanes in each group.

Optionally, the centers of the plurality of annular disks are collectively formed with an air intake passage for allowing air outside the laminar flow fan to enter.

Optionally, the bottom of the hub is provided with a plurality of inlets so that air in the air inlet channel enters the groove, and the guide vanes guide the air in the groove to emit heat generated by the operation of the motor when the air is guided between the plurality of annular discs.

Optionally, the guide vanes are provided in four groups, and are arranged outside the peripheral wall of the hub in a cross shape.

Optionally, the inner diameter of the plurality of annular disks is gradually reduced from one side far away from the circular disk to the other side.

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

Optionally, the connecting piece is provided with a plurality of connecting pieces which penetrate through the circular disk and the annular disks at even intervals.

Optionally, a plurality of air outlets are formed in gaps among the plurality of annular disks to blow out laminar air.

Optionally, the plurality of annular discs are all planar discs.

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

The utility model discloses a laminar flow fan, include: a plurality of annular disks disposed in parallel spaced apart from each other and having the same central axis; the circular disks are arranged on one sides of the annular disks at intervals in parallel, hubs are formed at the centers of the circular disks towards the annular disks, and grooves are defined in the hubs; the connecting piece penetrates through the circular disk and the annular disks to connect the annular disks to the circular disk; the groove is internally provided with a motor which directly drives the circular disk to rotate, and then the circular disk drives the plurality of annular disks to rotate so as to form laminar air by utilizing the viscous effect; one or more groups of guide vanes parallel to the annular disks are arranged outside the peripheral wall of the hub so as to guide the air in the groove to the annular disks through a plurality of outlets on the peripheral wall of the hub by utilizing a viscous effect when rotating, wherein the plurality of outlets are formed by gaps among the plurality of guide vanes in each group. The laminar flow fan realizes laminar flow air supply through a viscous effect, the noise is low and the air quantity is high in the air supply process, and the use experience of a user is effectively improved; the setting of water conservancy diversion piece effectively promotes the amount of wind that gets into laminar flow fan to promote laminar flow fan's work efficiency.

Further, the utility model discloses a laminar flow fan, the center of a plurality of annular discs is formed with inlet air channel jointly to make the outside air admission of laminar flow fan. A plurality of entries have been seted up to the wheel hub bottom to make the air in the inlet air duct get into the recess, and the water conservancy diversion piece gives off the heat that the motor work produced when leading the air in the recess between a plurality of annular discs, the heat of motor in time dispels the heat, can further promote laminar flow fan's work efficiency. The inner diameter of the plurality of annular disks of the laminar flow fan is gradually reduced from one side far away from the circular disks to the other side, so that the air quantity of the laminar flow fan can be effectively improved, and the air outlet of the laminar flow fan meets the use requirements of users.

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

Drawings

Some specific embodiments of the present invention will be described in detail hereinafter, by way of illustration and not by way of limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:

FIG. 1 is a schematic diagram of a prior art centrifugal fan;

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

FIG. 3 is a schematic view of the laminar flow fan shown in FIG. 2 from another perspective;

FIG. 4 is a schematic view of the laminar flow fan shown in FIG. 2;

FIG. 5 is a schematic view of the air circulation of the laminar flow fan of FIG. 2;

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

fig. 7 is a velocity profile and force profile of a laminar flow fan according to an embodiment of the present invention;

FIG. 8 is a partial cross-sectional view of a laminar flow fan with a gradual change in the inner diameter of a plurality of annular disks; and

FIG. 9 is a schematic diagram of the relationship between the inner diameter gradient of a plurality of annular disks and the air volume and the air pressure of the laminar flow fan in FIG. 8.

Detailed Description

Fig. 1 is a schematic diagram of an air supply of a centrifugal fan 200 in the prior art. Two arrows in fig. 1 show the air flowing direction of the centrifugal fan 200 during the air supply process when applied to the floor air conditioner, and the centrifugal fan 200 in the prior art needs to make two 90 ° turns from the air inlet to the air outlet during the whole process when applied to the floor air conditioner, and each turn is accompanied by a large air loss. In addition, the centrifugal fan 200 generally requires several tens of large-sized blades to increase wind pressure and wind volume, and the blades rotate to rub or impact air when the centrifugal fan 200 operates. Since the centrifugal fan 200 has wide blades and a large thickness, a very large noise is generated when the motor of the centrifugal fan 200 is operated at a high speed. In addition, a cross-flow fan is commonly used in the prior art, but although the noise of the cross-flow fan is low, the wind pressure is too small, and the air supply distance is short; and the whole volume of the cross flow fan is large, and the actual effective volume is small, so that the space waste is caused.

The embodiment provides the laminar flow fan, laminar flow air supply is realized by utilizing the viscous effect, the noise is low in the air supply process, the air quantity is high, and the use experience of a user is effectively improved; the flow deflector effectively promotes the amount of wind that gets into laminar flow fan to promote laminar flow fan's work efficiency. Fig. 2 is a schematic overall structure diagram of a laminar flow fan 100 according to an embodiment of the present invention, fig. 3 is a schematic overall structure diagram of the laminar flow fan 100 in fig. 2 from another view angle, fig. 4 is a schematic overall structure diagram of the laminar flow fan 100 in fig. 2 from another view angle, and fig. 5 is a schematic air circulation diagram of the laminar flow fan 100 in fig. 2. As shown in fig. 2 to 5, the laminar flow fan 100 of the present embodiment may generally include: a plurality of annular disks 10, a circular disk 30 and a web 40.

Wherein a plurality of annular disks 10 may be arranged in parallel spaced apart from each other with the same central axis. The circular disks 30 may be disposed in parallel at intervals at one side of the plurality of annular disks 10, and a hub 301 is formed at the center of the circular disks 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 disk 30 and the plurality of annular disks 10 to connect the plurality of annular disks 10 to the circular disk 30. A motor (not shown) may be disposed in the groove 305, and the motor directly drives the circular disk 30 to rotate, so that the circular disk 30 drives the plurality of annular disks 10 to rotate, so as to form a laminar air flow by using a viscous effect. Laminar flow fan 100 realizes the laminar flow air supply through the viscidity effect, and air supply process noise is little, the amount of wind is high, effectively promotes user's use and experiences.

One or more sets of guide vanes 302 are provided outside the circumferential wall of the hub 301 in parallel with the annular disks 10 to guide the air in the grooves 305 to between the plurality of annular disks 10 through a plurality of outlets 304 on the circumferential wall of the hub 301 by using a viscous effect when rotating, wherein the plurality of outlets 304 are formed by gaps between the plurality of guide vanes 302 in each set. As shown in fig. 3, the guide vanes 302 may be provided in four sets, and are disposed outside the circumferential wall of the hub 301 in a cross shape. It should be noted that the number of groups of the guide vanes 302 and the specific number of each group may be set according to the actual situation of the hub 301.

Fig. 6 is a schematic diagram illustrating an 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 a force distribution diagram of the laminar flow fan 100 according to an embodiment of the present invention. The blowing principle of the laminar flow fan 100 is derived primarily from the "tesla turbine" found in nigula tesla. Tesla turbines mainly utilize the 'laminar boundary layer effect' or 'viscous effect' of the fluid to achieve the purpose of doing work on 'turbine disks'. The laminar flow fan 100 of this embodiment drives the circular disk 30 through the motor, the circular disk 30 drives the plurality of annular disks 10 to rotate at a high speed, the air in each disk interval contacts and moves mutually, and the air boundary layer 13 near the surface of each disk is driven by the rotating disk to rotate from inside to outside to form laminar flow wind under the action of the viscous shear force τ. Wherein the air boundary layer 13 refers to a very thin layer of air adjacent to the surface of each disc. The plurality of annular disks 10 and the plurality of guide vanes 302 of the laminar flow fan 100 of the present embodiment both utilize a viscous effect during rotation.

Fig. 7 shows a schematic diagram of the viscous shear force distribution τ (y) and velocity distribution u (y) to which the air boundary layer 13 is subjected. The viscous shear forces experienced by the air boundary layer 13 are actually the drag forces that the individual disks create against the air boundary layer 13. The axis of abscissa in fig. 6 refers to the distance in the moving direction of the air boundary layer 13, and the axis of ordinate 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 within air boundary layer 13, δ is the thickness of air boundary layer 13, and τ w is the viscous shear force at the surface of annular disk 10. The variable y in τ (y) and u (y) refers to the height of the cross-section of the boundary layer 13 in the direction perpendicular to the direction of movement, and L is the distance between a point on the inner circumference of the annular disk 10 and a point on the surface of the annular disk 10.τ (y) is the distribution of viscous shear forces experienced at this distance L at a cross-sectional height y of the boundary layer 13 of air; u (y) is the velocity profile at this distance L for a cross-section of the air boundary layer 13 having a height y.

As shown in fig. 2 to 5, the centers of the plurality of annular disks 10 are collectively formed with an air inlet passage 11 to allow air outside the laminar flow fan 100 to enter. A plurality of air outlets 12 are formed in gaps between the plurality of annular disks 10 to allow laminar air to be blown out. It should be noted that the process of the air boundary layer 13 rotating from inside to outside to form laminar air is centrifugal motion, and therefore 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 wind pressure. As shown in fig. 2 and 3, a plurality of inlets 303 are formed at the bottom of the hub 301, so that the air in the air intake channel 11 enters the groove 305, and the guide vanes 302 can dissipate the heat generated by the operation of the motor when guiding the air in the groove 305 to the space between the plurality of annular discs 10. The plurality of inlets 303 may be evenly spaced along the bottom wall edge of the hub 301. The specific number and size of the inlets 303 may be set according to the actual requirements and the area of the bottom wall of the hub 301. The plurality of inlets 303 are formed in the bottom of the hub 301, so that air can be fed into the grooves 305, the weight of the laminar flow fan 100 is reduced, and the cost is effectively reduced.

The arrows in fig. 5 specifically show the process of air outside the laminar flow fan 100 entering the laminar flow fan 100. The air outside the laminar flow fan 100 firstly enters the air inlet channel 11, then a part of the air directly enters between the plurality of annular discs 10, and laminar flow air is blown out through the plurality of air outlets 12; a part enters the groove 305 through the inlet 303 at the bottom of the hub 301, and the deflector 302 guides the air in the part of the groove 305 to between the annular disks 10, and the laminar air is also blown out through the outlet ports 12. The flow deflector 302 can guide the air in the groove 305 to between the plurality of annular disks 10, so as to guide the air, improve the air intake between the plurality of annular disks 10, and further improve the working efficiency of the laminar flow fan 100; the heat generated by the motor during operation can be released in time, and the working efficiency of the laminar flow fan 100 is further improved.

Fig. 8 is a partial sectional view of the laminar flow fan 100 with gradually changing inner diameters of a plurality of annular disks 10, and fig. 9 is a schematic diagram of the relationship between the gradual change of the inner diameters of the plurality of annular disks 10 and the air volume and the air pressure of the laminar flow fan 100 in fig. 8. As shown in fig. 5, the inner diameters of the plurality of annular disks 10 of the present embodiment are gradually reduced from one side away from the circular disk 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 disk 30 to the other side, the air volume of the laminar flow fan 100 can be effectively increased, so that the air outlet of the laminar flow fan 100 meets the use requirement of a user. In a preferred embodiment, the inner diameters of two adjacent annular disks 10 vary by the same amount, that is, the inner diameters of the annular disks 10 decrease from one side away from the circular disk 30 to the other side by the same amount.

In fig. 9, the abscissa axis damping uniform expansion Inner radius increment refers to the variation of the Inner diameter of each ring disc 10 and the Inner diameter of the ring disc 10 adjacent to the lower side, the left ordinate axis Massflow rate refers to the air volume, and the right ordinate axis Pressure rise refers to the air Pressure. Specifically, fig. 9 is a schematic diagram illustrating the relationship between the gradual change of the inner diameter of the plurality of annular disks 10 and the air volume and the air pressure when the outer diameter, the distance, the number, the thickness, and the rotation speed of the motor of the annular disk 10 of the laminar flow fan 100 are all kept constant. As shown in fig. 9, when the above mentioned parameters are all kept constant, the inner diameter of the plurality of annular disks 10 gradually changes from one side far away from the circular disk 30 to the other side, which has a large influence on the air volume and a small influence on the air pressure. When the variation of the inner diameter of each annular disk 10 represented by the abscissa axis and the inner diameter of the adjacent annular disk 10 away from the side of the circular disk 30 is a positive number, it is described that the inner diameters of the plurality of annular disks 10 gradually increase from the side away from the circular disk 30 to the other side; when the variation of the inner diameter of each annular disk 10 shown by the abscissa axis and the inner diameter of the adjacent annular disk 10 at the side far from the circular disk 30 is a negative number, it is described that the inner diameters of the plurality of annular disks 10 gradually decrease from the side far from the circular disk 30 to the other side.

As can be seen from fig. 9, when the inner diameters of the plurality of annular disks 10 gradually decrease from one side far away from the circular disk 30 to the other side, the air volume of the laminar flow fan 100 increases and the air pressure decreases slightly; when the inner diameters of the plurality of annular disks 10 gradually increase from one side away from the circular disk 30 to the other side, the wind pressure of the laminar flow fan 100 slightly increases, and the wind volume greatly decreases. Thus, the inner diameters of the plurality of annular disks 10 are set to be gradually reduced from one side far from the circular disk 30 to the other side in consideration of the air volume and the air pressure of the laminar flow fan 100.

In a preferred embodiment, the outer diameter of the annular disk 10 of the laminar flow fan 100 is 175 mm, the pitch of the annular disks 10 is 13.75 mm, the number of the annular disks 10 is 8, the thickness of the annular disk 10 is 2 mm, and the rotation speed of the motor is 1000rpm (revolutions per minute), and at this time, the variation between the inner diameter of each annular disk 10 and the inner diameter of the adjacent annular disk 10 below may be set to be-5 mm in consideration of the air volume and the air pressure of the laminar flow fan 100. That is, the inner diameters of the 8 annular disks 10 from the side far from the circular disk 30 to the other side may be set as follows: the inner diameter of each annular disk 10 is reduced by 5mm from the inner diameter of the adjacent annular disk 10 below, by 115 mm, 110 mm, 105 mm, 100 mm, 95 mm, 90 mm, 85 mm, and 80 mm. It should be noted that the distance between the annular disks 10 in the above description specifically refers to the distance between two adjacent annular disks 10. It should be emphasized 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, which means that the inner diameters of the plurality of annular disks 10 gradually decrease along the direction of the airflow flowing in the air inlet channel 11.

The inner diameter of the ring-shaped disks 10 is gradually reduced from one side far from the circular disk 30 to the other side, and the chord length of the connecting piece 40 is gradually increased from one side far from the circular disk 30 to the other side. Wherein the cross section of the connecting piece 40 has two curves arranged in sequence along the rotating direction of the annular disk 10, and the chord length of the two curves is the chord length. The connecting pieces 40 may be provided in plural, and penetrate through the circular disk 30 and the annular disks 10 at even intervals, so as to ensure that the connection relationship between the circular disk 30 and the annular disks 10 is stable, and further ensure that the circular disk 30 can stably drive the annular disks 10 to rotate when the motor drives the circular disk 30 to rotate, thereby improving the operational reliability of the laminar flow fan 100.

In a specific embodiment, the plurality of annular disks 10 may be all planar disks, the radius of the circular disk 30 is the same as the outer diameter of the plurality of annular disks 10, and it should be noted that the inner diameter of the annular disk 10 refers to the radius of the inner circumference thereof; the outer diameter refers to the radius of its outer circumference. The laminar flow fan 100 of the present embodiment can not only be used alone for supplying air, but also, more importantly, the laminar flow fan 100 can be applied to indoor units of various air conditioners, such as a floor air conditioner, a wall air conditioner, and the like. Considering the limited space inherent in the indoor unit of the air conditioner, there is a certain constraint on the overall volume of the laminar flow fan 100. In the lateral direction, the radius of the circular disk 30 and the outer diameter of the annular disk 10 may be constrained; in the longitudinal direction, the spacing between the plurality of annular disks 10 and the thickness and number of the annular disks 10 may be restricted.

The spacing between each two adjacent annular disks 10 in the plurality of annular disks 10 of the present embodiment may be the same, that is, the plurality of annular disks 10 are arranged in parallel at the same spacing. The plurality of air outlets 12 formed by the gaps between the plurality of annular disks 10 can enable the laminar flow fan 100 to uniformly supply air at 360 degrees, so that various uncomfortable symptoms caused by direct blowing of air supplied by an air conditioner by a user are avoided, and the use experience of the user is further improved.

The laminar flow fan 100 of the present embodiment includes: a plurality of annular disks 10 disposed in parallel spaced apart from each other and having the same central axis; the circular disks 30 are arranged at one side of the plurality of annular disks 10 at intervals in parallel, a hub 301 is formed at the center of the circular disks 30 towards the plurality of annular disks 10, and a groove 305 is defined in the hub 301; and a connecting sheet 40 penetrating the circular disk sheet 30 and the plurality of annular disk sheets 10 to connect the plurality of annular disk sheets 10 to the circular disk sheet 30; a motor is arranged in the groove 305, the motor directly drives the circular disk sheet 30 to rotate, and then the circular disk sheet 30 drives the plurality of annular disk sheets 10 to rotate, so that laminar air is formed by utilizing a viscous effect; one or more sets of guide vanes 302 are provided outside the circumferential wall of the hub 301 in parallel with the annular disks 10 to guide the air in the grooves 305 to between the plurality of annular disks 10 through a plurality of outlets 304 on the circumferential wall of the hub 301 by using a viscous effect when rotating, wherein the plurality of outlets 304 are formed by gaps between the plurality of guide vanes 302 in each set. The laminar flow fan 100 realizes laminar flow air supply through a viscous effect, has low noise and high air quantity in the air supply process, and effectively improves the use experience of users; the arrangement of the guide vane 302 effectively increases the air volume entering the laminar flow fan 100, thereby increasing the working efficiency of the laminar flow fan 100.

Further, in the laminar flow fan 100 of the present embodiment, the air inlet channel 11 is formed at the center of the plurality of annular disks 10 to allow air outside the laminar flow fan 100 to enter. The bottom of the hub 301 is provided with a plurality of inlets 303, so that the air in the air intake channel 11 enters the groove 305, and the guide vanes 302 dissipate the heat generated by the operation of the motor when guiding the air in the groove 305 to the space between the plurality of annular disks 10, so as to dissipate the heat of the motor in time, thereby further improving the working efficiency of the laminar flow fan 100. The inner diameters of the plurality of annular disks 10 of the laminar flow fan 100 are gradually reduced from one side far away from the circular disk 30 to the other side, so that the air volume of the laminar flow fan 100 can be effectively increased, and the air outlet of the laminar flow fan 100 meets the use requirements of users.

It should be understood by those skilled in the art that, without specific description, terms used to represent orientations or positional relationships in the embodiments of the present invention such as "upper," "lower," "left," "right," "front," "rear," and the like are used with reference to the actual usage state of the laminar flow fan 100, and these terms are only used for convenience of description and understanding of the technical solution of the present invention, and do not indicate or imply that the device or component referred to must have a specific orientation, and therefore, should not be construed as limiting the present invention.

Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been shown and described in detail herein, many other variations and modifications can be made, consistent with the principles of the invention, which are directly determined or derived from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the present invention should be understood and interpreted to cover all such other variations or modifications.

Claims (10)

1. A laminar flow fan, comprising:

a plurality of annular disks disposed in parallel spaced apart from each other and having the same central axis;

the circular disks are arranged on one sides of the annular disks at intervals in parallel, a hub is formed at the center of each circular disk towards the annular disks, and a groove is defined in the hub; and

a connecting piece penetrating through the circular disk and the plurality of annular disks to connect the plurality of annular disks to the circular disk;

the groove is internally provided with a motor, 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 form laminar air by utilizing a viscous effect;

one or more groups of guide vanes parallel to the annular discs are arranged outside the peripheral wall of the hub so as to guide the air in the grooves to the annular discs through a plurality of outlets on the peripheral wall of the hub by using a viscous effect when rotating, wherein the plurality of outlets are formed by gaps among the plurality of guide vanes in each group.

2. The laminar flow fan according to claim 1,

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

3. The laminar flow fan according to claim 2,

the bottom of the hub is provided with a plurality of inlets so that the air in the air inlet channel enters the groove, and

the guide vanes can radiate heat generated by the work of the motor when guiding the air in the groove among the plurality of annular discs.

4. The laminar flow fan according to claim 1,

the four groups of flow deflectors are arranged outside the peripheral wall of the hub in a cross shape.

5. The laminar flow fan according to claim 1,

the inner diameters of the annular disks are gradually reduced from one side far away from the circular disks to the other side.

6. The laminar flow fan according to claim 5,

the chord length of the connecting piece is gradually increased from one side far away from the circular disc to the other side.

7. The laminar flow fan according to claim 1,

the connecting pieces are provided with a plurality of connecting pieces which penetrate through the circular discs and the annular discs at even intervals.

8. The laminar flow fan according to claim 1,

and a plurality of air outlets are formed in gaps among the annular disks for blowing out laminar air.

9. The laminar flow fan according to claim 1,

the plurality of annular disks are all planar disks.

10. The laminar flow fan according to claim 1,

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