CN210013834U

CN210013834U - Laminar flow fan

Info

Publication number: CN210013834U
Application number: CN201920079089.3U
Authority: CN
Inventors: 李婧; 王晶晶
Original assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd
Current assignee: Qingdao Haier Air Conditioner Gen Corp Ltd; Qingdao Haier Co Ltd; Qingdao Haier Smart Technology R&D Co Ltd
Priority date: 2019-01-17
Filing date: 2019-01-17
Publication date: 2020-02-04
Anticipated expiration: 2029-01-17

Abstract

The utility model provides a laminar flow fan. Wherein laminar flow fan includes: the annular disks are arranged in parallel at intervals and have the same central axis, and each annular disk is an arc disk which gradually rises from inside to outside and protrudes upwards; and the motor is configured to drive the plurality of annular disks to rotate so as to enable the plurality of annular disks to be in contact with air between the plurality of annular disks and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular disks to be driven by the plurality of annular disks which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air. The utility model discloses a laminar flow fan, arc disc make outside air get into laminar flow fan's angle accord with the fluid flow more, more do benefit to outside air admission laminar flow fan, effectively reduce the loss of air volume, and realize the laminar flow air supply through the viscidity effect, air supply process noise is little, the wind gauge height, effectively promotes user's use and experiences.

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.

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 makes laminar flow fan realize 360 air supplies, avoids the air-out to blow directly the user, promotes user's use and experiences.

In particular, the utility model provides a laminar flow fan, include: the annular disks are arranged in parallel at intervals and have the same central axis, and each annular disk is an arc disk which gradually rises from inside to outside and protrudes upwards; and the motor is configured to drive the plurality of annular disks to rotate so as to enable the plurality of annular disks to be in contact with air between the plurality of annular disks and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular disks to be driven by the plurality of annular disks which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air.

Optionally, the inner diameters of the plurality of annular disks are gradually reduced from bottom to top, and a central angle of a connecting line of the inner diameter and the outer diameter of the plurality of annular disks is 9 ° to 30 °.

Optionally, the laminar flow fan further comprises: the single circular disk is arranged above the plurality of annular disks in parallel at intervals, and the motor is fixedly arranged above the circular disks.

Optionally, the laminar flow fan further comprises: and the connecting rod penetrates through the circular disk and the annular disks to connect the annular disks to the circular disk.

Optionally, the electric machine is further configured to: the circular disk is directly driven to rotate, and then the circular disk drives the plurality of annular disks to rotate.

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

Optionally, the lower surface of the circular disk has an inverted conical protrusion to direct the flow of air entering the laminar flow fan and assist in creating laminar air flow.

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

Optionally, the connecting rods are multiple and penetrate through the edge parts of the circular disk and the annular disks at uniform intervals.

Optionally, the electric machine is further configured to: the rotating speed of the motor is determined according to the obtained target air volume of the laminar flow fan, and the rotating speed and the target air volume are in a linear relation.

The utility model discloses a laminar flow fan, include: the annular disks are arranged in parallel at intervals and have the same central axis, and each annular disk is an arc disk which gradually rises from inside to outside and protrudes upwards; and the motor is configured to drive the plurality of annular disks to rotate so as to enable the plurality of annular disks to be in contact with air between the plurality of annular disks and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular disks to be driven by the plurality of annular disks which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air. Every annular disc all sets to from interior to exterior and risees gradually and bellied arc disc that makes progress for outside air gets into laminar flow fan's angle and accords with fluid flow more, thereby more does benefit to outside air admission laminar flow fan, effectively reduces the loss of amount of wind, guarantees that laminar flow fan's air-out satisfies user's user demand. In addition, laminar flow fan realizes the laminar flow air supply through the viscidity effect, reduces traditional fan and can not increase the requirement that the blade can satisfy the amount of wind even to the use of blade, and air supply process noise is little, the amount of wind is high, effectively promotes user's use and experiences.

Further, the utility model discloses a laminar flow fan still includes: the single circular disk is arranged above the plurality of annular disks in parallel at intervals, and the motor is fixedly arranged above the circular disks. And the connecting rod penetrates through the circular disk and the annular disks to connect the annular disks to the circular disk. The electric machine is further configured to: the circular disk is directly driven to rotate, and then the circular disk drives the plurality of annular disks to rotate. 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. A plurality of air outlets are formed in gaps among the annular disks so as to blow laminar air out. After laminar air is blown out through the plurality of air outlets, air outside the laminar flow fan is pressed into the annular disc through the air inlet due to the action of pressure difference, and the circulation is repeated, so that laminar air circulation is formed. A plurality of air outlets formed by the gaps among the plurality of annular disks can enable the laminar flow fan to realize 360-degree air supply, 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 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 a central angle of a connecting line of inner and outer diameters of a plurality of annular disks of a laminar flow fan on the same longitudinal section passing through a central axis according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of the relationship between the central angle and the wind volume and the wind pressure in FIG. 5;

fig. 7 is a schematic diagram of an air supply principle of a laminar flow fan according to an embodiment of the present invention;

fig. 8 is a velocity profile and force profile of a laminar flow fan according to an embodiment of the present invention;

fig. 9 is a schematic air circulation diagram of a laminar flow fan according to an embodiment of the present invention; and

fig. 10 is a schematic diagram illustrating a relationship between a motor rotation speed and an air volume of a laminar flow fan according to an embodiment of the present invention.

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 a laminar flow fan 100, can reduce the use of traditional fan to the blade and can not increase the requirement that the blade can satisfy the amount of wind even, and air supply process noise is little, the amount of wind is high, effectively promotes user's use and experiences. 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 another view angle of the laminar flow fan 100 in fig. 2, and fig. 4 is a schematic overall structure diagram of another view angle of the laminar flow fan 100 in fig. 2. As shown in fig. 2 to 4, the laminar flow fan 100 of the present embodiment may generally include: a plurality of annular disks 10 and a motor 20.

Wherein, a plurality of annular disks 10 can be arranged in parallel at intervals, have the same central axis, and each annular disk 10 is an arc disk which gradually rises from inside to outside and is convex upwards. Compared with a plane disk, the arc disk can enable the angle of external air entering the laminar flow fan 100 to better accord with the flow of fluid, so that the external air can enter the laminar flow fan 100 more conveniently, and the air volume loss is effectively reduced.

The laminar flow fan 100 of the present embodiment can be used not only alone for supplying air, but also, more importantly, can be applied to indoor units of various types of air conditioners, such as an upright air conditioner, a wall-mounted 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 occupied volume of the laminar flow fan 100. The laminar flow fan 100 of the present embodiment can restrict the number of the annular disks 10, the distance between two adjacent annular disks 10, and the thickness of the annular disks 10, respectively, considering that the thickness is not too large. Furthermore, the laminar flow fan 100 may impose a corresponding constraint on the outer diameter of the annular disk 10 in view of not taking the lateral footprint excessively large. It should be noted that the outer diameter of the annular disk 10 refers to the radius of the outer circumference of the annular disk 10, and the inner diameter of the annular disk 10 refers to the radius of the inner circumference of the annular disk 10.

The motor 20 may be configured to drive the plurality of annular disks 10 to rotate, so that the plurality of annular disks 10 contact with each other and move with each other, and the air boundary layer 13 near the surfaces of the plurality of annular disks 10 is driven by the plurality of annular disks 10 rotating due to the viscous effect to rotate from inside to outside to form a laminar air flow. Wherein the air boundary layer 13 is a very thin layer of air adjacent to the surface of each disc.

In the laminar flow fan 100 of this embodiment, each annular disk 10 is set to be an arc disk that gradually rises from inside to outside and protrudes upward, so that the angle at which external air enters the laminar flow fan 100 better conforms to the fluid flow, thereby being more beneficial to the external air entering the laminar flow fan 100, effectively reducing the air loss, and ensuring that the air outlet of the laminar flow fan 100 meets the use requirements of users. In addition, laminar flow fan 100 realizes the laminar flow air supply through the viscidity effect, reduces the use of traditional fan to the blade and can satisfy the requirement of the amount of wind even can not increase the blade, and air supply process noise is little, the amount of wind is high, effectively promotes user's use and experiences.

Fig. 5 is a schematic diagram of a central angle θ of a connecting line of inner and outer diameters of a 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. 6 is a schematic diagram of a relationship between the central angle θ and the air volume and the air pressure in fig. 5. As shown in fig. 5, the inner diameters of the plurality of annular disks 10 are gradually reduced from bottom to top, and a central angle θ is formed by connecting inner and outer diameters of the plurality of annular disks 10 on the same longitudinal section passing through the central axis. The inner diameters of the plurality of annular disks 10 are gradually reduced from bottom to top, 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.

In fig. 6, the abscissa axis θ indicates a central angle of a connecting line of the inner diameter and the outer diameter of the plurality of annular disks 10 on the same longitudinal section passing through the central axis, the left ordinate axis Mass flow rate indicates an air volume, the right ordinate axis Pressure indicates an air Pressure, and the air Pressure indicates a Pressure difference between the air outlet 12 of the laminar flow fan 100 and the inlet of the air inlet channel 11. Specifically, fig. 6 is a schematic diagram illustrating the relationship between the central angle θ and the air volume and the air pressure when the outer diameter, the number of layers, the pitch, the thickness of the annular disk 10 and the rotation speed of the motor 20 of the laminar flow fan 100 are all kept constant. As shown in fig. 6, when the above-mentioned parameters are all kept constant, as the central angle θ is gradually increased, the air volume of the laminar flow fan 100 is increased and then decreased, and the air pressure slightly increases. In a preferred embodiment, the outer diameter of the annular disk 10 of the laminar flow fan 100 is 175 mm, the number of layers of the annular disk 10 is 10, the pitch of the annular disks 10 is 13.75 mm, the thickness of the annular disk 10 is 2 mm, and the rotation speed of the motor 20 is 1000rpm (revolutions per minute), and in consideration of the air volume and the air pressure, the central angle θ of the inner and outer diameter connecting lines of the plurality of annular disks 10 on the same longitudinal section passing through the central axis may be set to be 9 ° to 30 °. As shown in fig. 6, when the central angle θ is set to 15 °, the air volume of the laminar flow fan 100 reaches the maximum value.

As shown in fig. 2 to 4, the laminar flow fan 100 may further include: a single circular disk 30 and a connecting rod 40. Wherein the circular disks 30 may be spaced apart and arranged in parallel above the plurality of annular disks 10, and the motor 20 is fixedly arranged above the circular disks 30. Tie rods 40 may extend through circular disk 30 and plurality of annular disks 10 to connect plurality of annular disks 10 to circular disk 30. The motor 20 may also be configured to: the circular disk 30 is directly driven to rotate, and the circular disk 30 drives the plurality of annular disks 10 to rotate. That is, the motor 20 configured to rotate the plurality of annular discs 10 is dependent on the motor 20 first rotating the circular discs 30 and then rotating the plurality of annular discs 10 by the circular discs 30. In a specific embodiment, the radius of the circular disk 30 is the same as the outer diameter of the plurality of annular disks 10, so that the overall occupied volume of the laminar flow fan 100 can be effectively restricted.

In a preferred embodiment, the connecting rods 40 are plural and uniformly spaced throughout the edge portions of the circular disks 30 and the plurality of annular disks 10. The connecting rods 40 uniformly penetrate through the edge portions of the circular disk 30 and the annular disks 10 at intervals, so that the connection relationship between the circular disk 30 and the annular disks 10 can be ensured to be stable, and further, when the motor 20 drives the circular disk 30 to rotate, the circular disk 30 can stably drive the annular disks 10 to rotate, thereby improving the working reliability of the laminar flow fan 100.

Fig. 7 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. 8 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 and the disk drives the plurality of annular disks 10 to rotate at a high speed through the motor 20, and the air in the disk intervals contacts and moves with each other, so that the air boundary layer 13 near the surface of each disk is driven by the rotating disk to rotate from inside to outside under the action of the viscous shear force τ to form laminar flow wind.

Fig. 8 is a schematic diagram showing the viscous shear force distribution τ (y) and the 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. 8 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. v. of_eThe air flow velocity at each point in the air boundary layer 13, δ being the thickness of the air boundary layer 13, τ_wIs a viscous shear force at the surface of the annular disc 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.

Fig. 9 is an air circulation diagram of a laminar flow fan 100 according to an embodiment of the present invention. As shown in fig. 2 to 4 and 9, an 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. 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. The process of the laminar wind formed by the air boundary layer 13 rotating from inside to outside is centrifugal motion, so that the speed of the laminar wind leaving the air outlet 12 is higher than that of the laminar wind entering the air inlet channel 11. 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. In addition, the annular disks 10 of the present embodiment are all arc disks that gradually rise from inside to outside and protrude upward, so that an angle at which external air enters the laminar flow fan 100 better conforms to fluid flow, and especially, the angle is more favorable for air in the air inlet channel 11 to enter gaps between the annular disks 10, thereby effectively reducing air loss.

In a preferred embodiment, as shown in fig. 4, the lower surface of the circular disk 30 has an inverted conical protrusion 31 to guide the flow of air entering the laminar flow fan 100 and assist in forming laminar air. The upper surface of circular disk 30 may be a plane, and circular disk 30 mainly functions to fixedly receive motor 20 and is connected to a plurality of annular disks 10 through connecting rod 40, so as to drive a plurality of annular disks 10 to rotate when motor 20 drives circular disk 30 to rotate. The inverted conical protrusion 31 on the lower surface of the circular disk 30 can effectively guide the air entering the laminar flow fan 100 through the air inlet channel 11 to enter the gap between the disks, thereby improving the efficiency of forming laminar flow air.

Fig. 10 is a schematic diagram illustrating a relationship between a rotation speed of the motor 20 and an air volume of the laminar flow fan 100 according to an embodiment of the present invention. Wherein the abscissa axis Speed of revolution refers to the rotational Speed of the motor 20, and the left ordinate axis Mass flow rate refers to the air volume. Specifically, fig. 10 is a schematic diagram illustrating the relationship between the rotation speed of the motor 20 and the air volume when the outer diameter, the inner diameter, the number of layers, the distance, and the thickness 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 kept constant, the air volume increases linearly with the increase of the rotation speed of the motor 20, and the change is obvious. That is, for the same laminar flow fan 100, the air volume linearly increases as the rotation speed of the motor 20 increases. Since the wind pressure is not substantially changed as the rotation speed of the motor 20 increases, it is not shown in the drawing. In a preferred embodiment, the outer diameter of the annular disk 10 of the laminar flow fan 100 is 175 mm, the number of layers of the annular disk 10 is 10, the pitch of the annular disks 10 is 13.75 mm, the thickness of the annular disk 10 is 2 mm, and when the central angle θ of the inner and outer diameter connecting lines of the plurality of annular disks 10 on the same longitudinal section passing through the central axis is 16.7 °, the linear relationship between the rotation speed of the motor 20 and the air volume of the laminar flow fan 100 is more obvious.

Since the rotation speed of the motor 20 is linear with the air volume of the laminar flow fan 100 when the annular disk 10 is an arc-shaped disk which gradually rises from inside to outside and protrudes upwards, in a preferred embodiment, the motor 20 may be further configured to: the rotation speed of the motor 20 is determined according to the acquired target air volume of the laminar flow fan 100. That is, the target air volume of the laminar flow fan 100 may be first obtained, and then the rotation speed of the motor 20 may be determined according to a linear relationship between the target air volume and the rotation speed of the motor 20. The target air volume may be obtained by an input operation of the user.

The laminar flow fan 100 of the present embodiment includes: a plurality of annular disks 10, which are arranged in parallel at intervals and have the same central axis, and each annular disk 10 is an arc-shaped disk which gradually rises from inside to outside and protrudes upwards; and a motor 20 configured to drive the plurality of annular disks 10 to rotate, so that the plurality of annular disks 10 contact with each other and move with each other, and further, the air boundary layer 13 close to the surfaces of the plurality of annular disks 10 is driven by the plurality of annular disks 10 rotating due to the viscous effect to rotate from inside to outside to form laminar air. Each annular disc 10 is set to be an arc disc which gradually rises from inside to outside and protrudes upwards, so that the angle of the external air entering the laminar flow fan 100 is more consistent with the flow of the fluid, the external air entering the laminar flow fan 100 is more facilitated, the air loss is effectively reduced, and the air outlet of the laminar flow fan 100 is ensured to meet the use requirements of users. In addition, laminar flow fan 100 realizes the laminar flow air supply through the viscidity effect, reduces the use of traditional fan to the blade and can satisfy the requirement of the amount of wind even can not increase the blade, and air supply process noise is little, the amount of wind is high, effectively promotes user's use and experiences.

Further, the laminar flow fan 100 of the present embodiment further includes: the single circular disks 30 are arranged above the plurality of annular disks 10 in parallel at intervals, and the motor 20 is fixedly arranged above the circular disks 30. And a connecting rod 40 penetrating the circular disk 30 and the plurality of annular disks 10 to connect the plurality of annular disks 10 to the circular disk 30. The motor 20 is further configured to: the circular disk 30 is directly driven to rotate, and the circular disk 30 drives the plurality of annular disks 10 to rotate. The centers of the plurality of annular disks 10 are collectively formed with an air intake 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. After the laminar air is blown out through the plurality of air outlets 12, the air outside the laminar fan 100 is forced into the annular disk 10 through the air inlet due to the pressure difference, and the circulation is repeated, so that laminar air circulation is formed. 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 realize 360-degree air supply, 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.

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

1. A laminar flow fan, comprising:

the annular disks are arranged in parallel at intervals and have the same central axis, and each annular disk is an arc disk which gradually rises from inside to outside and protrudes upwards; and

and the motor is configured to drive the plurality of annular discs to rotate, so that the plurality of annular discs are in contact with air among each other and move mutually, and further, an air boundary layer close to the surfaces of the plurality of annular discs is driven by the plurality of annular discs which rotate due to a viscous effect to rotate from inside to outside to form laminar wind.

2. The laminar flow fan according to claim 1,

the inner diameters of the annular disks are gradually reduced from bottom to top, and the central angle of the inner diameter connecting line and the outer diameter connecting line of the annular disks on the same longitudinal section passing through the central axis is 9-30 degrees.

3. The laminar flow fan according to claim 1, further comprising:

a single circular disk, which is arranged above the annular disks in parallel at intervals, and

the motor is fixedly arranged above the circular disk.

4. The laminar flow fan according to claim 3, characterized by further comprising:

a connecting rod penetrating the circular disks and the plurality of annular disks to connect the plurality of annular disks to the circular disks;

the electric machine is further configured to: the circular disk is directly driven to rotate, and the circular disk drives the annular disks to rotate.

5. 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.

6. The laminar flow fan according to claim 5,

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

7. The laminar flow fan according to claim 3,

the lower surface of the circular disk has an inverted conical protrusion to guide the flow of air entering the laminar flow fan and assist in forming the laminar flow wind.

8. The laminar flow fan according to claim 3,

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

9. The laminar flow fan according to claim 4,

the connecting rods are multiple and penetrate through the edge parts of the circular disks and the annular disks at even intervals.

10. The laminar flow fan according to claim 1, wherein the motor is further configured to:

the rotating speed of the motor is determined according to the obtained target air volume of the laminar flow fan, and the rotating speed and the target air volume are in a linear relation.