CN111520343A

CN111520343A - Laminar flow fan

Info

Publication number: CN111520343A
Application number: CN201910045377.1A
Authority: CN
Inventors: 李婧; 王晶晶; 房启岭
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: 2020-08-11

Abstract

The invention provides a laminar flow fan. Wherein laminar flow fan includes: a plurality of annular disks arranged in parallel with each other at intervals and having the same central axis; the motor is configured to drive the plurality of annular discs to rotate so as to enable the plurality of annular discs to be in contact with air between the plurality of annular discs and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular discs to be driven by the plurality of annular discs which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air; the double-arc blade penetrates through the annular disks, the cross section of the double-arc blade is provided with a double-arc protruding towards the rotating direction of the annular disks, the double-arc blade comprises an inner arc and a back arc which are sequentially arranged along the rotating direction of the annular disks, and the inner arc and the back arc are provided with the same circle center and are arranged in parallel. According to the laminar flow fan, the double-arc blades can improve the wind pressure of the laminar flow fan and promote laminar flow air circulation; laminar air supply is realized through the viscosity effect, and the air supply process is low in noise, high in air quantity and high in air pressure.

Description

Laminar flow fan

Technical Field

The invention relates to the technical field of household appliances, in particular 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.

Disclosure of Invention

The invention aims to provide a laminar flow fan with low noise, high air quantity and high air pressure.

The invention further aims to realize 360-degree air supply of the laminar flow fan, avoid air outlet from blowing directly to users and improve the use experience of the users.

In particular, the present invention provides a laminar flow fan comprising: a plurality of annular disks, which are arranged in parallel at intervals and have the same central axis; the motor is configured to drive the plurality of annular discs to rotate so as to enable the plurality of annular discs to be in contact with air between the plurality of annular discs and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular discs to be driven by the plurality of annular discs which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air; and the double-arc blade penetrates through the annular disks, the cross section of the double-arc blade is provided with a double-arc protruding towards the rotating direction of the annular disks, the double-arc comprises an inner arc and a back arc which are sequentially arranged along the rotating direction of the annular disks, and the inner arc and the back arc have the same circle center and are arranged in parallel.

Optionally, on the same cross-section of the bi-arc blade and the annular disc, a chord line between two ends of the inner arc forms an angle of-5 ° to 55 ° with the outer diameter of the annular disc passing through the midpoint of the chord line.

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 bi-arc blades also extend through the circular disk to connect the plurality of 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 plurality of annular disks are all planar disks; 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 double-arc blades are multiple and uniformly spaced throughout the circular disk and the multiple annular disks.

The laminar flow fan of the present invention includes: a plurality of annular disks arranged in parallel with each other at intervals and having the same central axis; the motor is configured to drive the plurality of annular discs to rotate so as to enable the plurality of annular discs to be in contact with air between the plurality of annular discs and move mutually, and further enable the air boundary layer close to the surfaces of the plurality of annular discs to be driven by the plurality of annular discs which rotate due to the viscous effect to rotate from inside to outside so as to form laminar air; and the double-arc blade penetrates through the annular disks, the cross section of the double-arc blade is provided with a double-arc protruding towards the rotating direction of the annular disks, the double-arc comprises an inner arc and a back arc which are sequentially arranged along the rotating direction of the annular disks, and the inner arc and the back arc have the same circle center and are arranged in parallel. The setting of biarc blade can greatly promote laminar flow fan's wind pressure to promote laminar flow air circulation. In addition, laminar flow fan realizes the laminar flow air supply through the viscidity effect, and air supply process noise is little, the amount of wind is high, the wind pressure is big, effectively promotes user's use and experiences.

Furthermore, on the same cross section of the double-arc blade and the annular disc, an included angle formed by a chord line between two end points of an inner arc and the outer diameter of the annular disc passing through the midpoint of the chord line is-5-55 degrees, the installation angle gives consideration to the air volume and the air pressure of the laminar flow fan, the comprehensive performance of the laminar flow fan is effectively guaranteed, the air outlet of the laminar flow fan can meet the use requirements of users when the air pressure is large, and the use experience of the users is further improved.

Further, the laminar flow fan of the present invention further 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. The bi-arc blades also extend through the circular disk to connect the plurality of 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 invention will be described in detail hereinafter, by way of illustration and not 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 diagram of the overall structure of a laminar flow fan according to one 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 cross-sectional view of a laminar flow fan according to one embodiment of the invention;

FIG. 6 is a schematic diagram illustrating the relationship between the installation angle of the double-arc blade of the laminar flow fan and the air volume and the air pressure according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of the 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 one embodiment of the present invention; and FIG. 9 is a schematic view of the air circulation of a laminar flow fan according to one 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, realizes the laminar flow air supply through the viscidity effect, and air supply process noise is little, the amount of wind is high, the wind pressure is big, 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 the laminar flow fan 100 in fig. 2 from another view, fig. 4 is a schematic overall structure diagram of the laminar flow fan 100 in fig. 2 from another view, and fig. 5 is a schematic cross-sectional view of the laminar flow fan 100 according to an embodiment of the present invention. 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 motor 20, and a double circular arc blade 40.

Wherein a plurality of annular disks 10 may be arranged in parallel spaced apart from each other with the same central axis. 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.

The double circular arc blade 40 may penetrate the plurality of annular disks 10, wherein the cross section of the double circular arc blade 40 has a double circular arc convex toward the direction in which the annular disks 10 rotate, and the double circular arc includes an inner arc 41 and a back arc 42 sequentially arranged along the direction in which the annular disks 10 rotate, and the inner arc 41 and the back arc 42 have the same center and are arranged in parallel. Fig. 5 is a schematic cross-sectional view of laminar flow fan 100 viewed from above, with motor 20 driving annular disk 10 to rotate clockwise, and with the direction of projection of back arcs 42 and inner arcs 41 coinciding with the direction of rotation of annular disk 10. In other embodiments, the motor 20 may also drive the annular disk 10 to rotate counterclockwise, and the protruding directions of the back arc 42 and the inner arc 41 may be opposite to those shown in fig. 5.

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 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 laminar flow fan 100 of the present embodiment, with the arrangement of the double-arc blade 40, can greatly increase the wind pressure of the laminar flow fan 100, thereby promoting the laminar air circulation. In addition, laminar flow fan 100 realizes the laminar flow air supply through the viscidity effect, and the air supply process noise is little, the wind gauge height, the wind pressure is big, effectively promotes user's use and experiences.

Fig. 6 is a schematic diagram illustrating a relationship between a mounting angle α of the bi-arc blade 40 of the laminar flow fan 100 and an air volume and an air pressure according to an embodiment of the present invention. The mounting angle α of the double-arc blade 40 in fig. 6 actually means: on the same cross section of the bi-arc blade 40 and the annular disc 10, a chord line 51 between the two ends of the inner arc 41 forms an angle with an outer diameter 52 of the annular disc 10 passing through the midpoint of the chord line 51. Fig. 5 shows the same cross section of a blade 40 and an annular disc 10, which may be bi-circular, with a chord line 51 between the ends of the inner arc 41 forming an angle a with the outer diameter 52 of the annular disc 10 passing through the midpoint of the chord line 51.

The axis of abscissa (α) in fig. 6 refers to the installation angle of the bi-arc blade 40 of the laminar fan 100, i.e., the included angle formed by the chord line 51 between the two ends of the inner arc 41 and the outer diameter 52 of the annular disk 10 passing through the midpoint of the chord line 51 on the same cross section of the bi-arc blade 40 and the annular disk 10. The Mass flow rate on the left ordinate axis refers to the air volume, the Pressure rise on the right ordinate axis refers to the air Pressure, and the air Pressure refers to the 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 installation angle α and the air volume and the air pressure when the outer diameter, the inner diameter, the number of layers, the pitch, the thickness, the chord length of the bi-arc blade 40, and the rotation speed of the motor 20 of the annular disk 10 of the laminar fan 100 are all kept constant. The chord length of the double-arc blade 40 of the present embodiment may be a straight distance between both end points of the inner arc 41 or the back arc 42.

In the case where each of the above-mentioned parameters is kept constant, for example, in a preferred embodiment, the outer diameter of the ring-shaped disk 10 of the laminar fan 100 is 175 mm, the inner diameter of the ring-shaped disk 10 is 115 mm, the number of layers of the ring-shaped disks 10 is 8, the pitch of the ring-shaped disks 10 is 13.75 mm, the thickness of the ring-shaped disk 10 is 2 mm, the chord length of the double-circular-arc blade 40 is 35 mm, and the rotation speed of the motor 20 is 1000rpm, at which the mounting angle α of the double-circular-arc blade 40 may be set to-5 ° to 55 ° in consideration of the wind pressure and the comprehensive wind pressure. In addition, when a chord line 51 between two end points of the inner arc 41 and an outer diameter 52 of the annular disk 10 passing through a midpoint of the chord line 51 are sequentially arranged along the rotation direction of the annular disk 10, the installation angle alpha is a positive number; the installation angle α is a negative number when the outer diameter 52 of the annular disk 10 passes through the midpoint of the chord line 51 and the chord line 51 between the two end points of the inner arc 41 in this order in the direction in which the annular disk 10 rotates.

As shown in fig. 2 to 4, the laminar flow fan 100 may further include: a single circular disc 30. 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. Double-arc blades 40 may also extend through circular disk 30 to connect multiple 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, and may be set to 170 mm to 180 mm, so as to constrain the horizontal occupied volume of the laminar flow fan 100, cooperatively define the number of annular disks 10 and the distance between two adjacent annular disks 10, and constrain the longitudinal thickness of the laminar flow fan 100, so as to effectively constrain the overall occupied volume of the laminar flow fan 100. Note that, the inner diameter of the annular disk 10 refers to the radius of its inner circumference; the outer diameter refers to the radius of its outer circumference.

In a preferred embodiment, the bi-arc blades 40 are a plurality and are evenly spaced throughout the circular disk 30 and the plurality of annular disks 10. The double-arc blades 40 uniformly penetrate through the circular disk 30 and the annular disks at intervals, so that the connection relationship between the circular disk 30 and the annular disks 10 is 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 of 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 velocity of the air flow at each point in the air boundary layer 13, 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 a schematic 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.

The plurality of annular disks 10 may each be planar disks and in a preferred embodiment, the lower surface of the circular disk 30 has an inverted conical protrusion 31 to guide the air flow entering the laminar flow fan 100 and assist in forming laminar air flow. The upper surface of the circular disk 30 may be a plane, and the circular disk 30 mainly functions to fixedly receive the motor 20 and is connected to the plurality of annular disks 10 through the double circular arc blades 40 to drive the plurality of annular disks 10 to rotate when the motor 20 drives the 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.

The laminar flow fan 100 of the present embodiment includes: a plurality of annular disks 10 arranged in parallel spaced apart from each other with the same central axis; 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 an 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 a viscous effect to rotate from inside to outside to form laminar air; and a bi-arc blade 40 penetrating the plurality of annular disks 10, wherein the cross section of the bi-arc blade 40 has a bi-arc convex toward the direction of rotation of the annular disks 10, and the bi-arc includes an inner arc 41 and a back arc 42 sequentially arranged along the direction of rotation of the annular disks 10, and the inner arc 41 and the back arc 42 have the same center and are arranged in parallel. The double circular arc blades 40 can greatly improve the wind pressure of the laminar flow fan 100, thereby promoting the laminar flow air circulation. In addition, laminar flow fan 100 realizes the laminar flow air supply through the viscidity effect, and the air supply process noise is little, the wind gauge height, the wind pressure is big, effectively promotes user's use and experiences.

Further, in the laminar flow fan 100 of the embodiment, on the same cross section of the double-arc blade 40 and the annular disk 10, an included angle formed by the chord line 51 between the two end points of the inner arc 41 and the outer diameter 52 of the annular disk 10 passing through the midpoint of the chord line 51 is-5 ° to 55 °, and the installation angle gives consideration to the air volume and the air pressure of the laminar flow fan 100, so that the comprehensive performance of the laminar flow fan 100 is effectively guaranteed, the air outlet of the laminar flow fan 100 can meet the use requirements of users while the air pressure is large, and the use experience of the users is further improved.

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. Double-circular-arc blades 40 also extend through circular disk 30 to connect a plurality of annular disks 10 to 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, unless otherwise specified, terms such as "upper", "lower", "left", "right", "front", "rear", and the like used in the embodiments of the present invention to indicate orientation or positional relationship are based on the actual use 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 illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.

Claims

1. A laminar flow fan comprising:

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

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 the viscous effect to rotate from inside to outside to form laminar air; and

the double-arc blade penetrates through the annular disks, wherein the cross section of the double-arc blade is provided with a double-arc towards the direction in which the annular disks rotate is convex, the double-arc blade comprises an inner arc and a back arc which are sequentially arranged along the direction in which the annular disks rotate, and the inner arc and the back arc are provided with the same circle center and are arranged in parallel.

2. The laminar flow fan according to claim 1,

on the same cross section of the double-arc blade and the annular disk, an included angle formed by a chord line between two end points of the inner arc and the outer diameter of the annular disk passing through the midpoint of the chord line is-5-55 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 2,

the bi-arc blades also extend through the circular disk to connect the plurality of annular disks to the circular disk.

5. The laminar flow fan according to claim 4, wherein the motor is further configured to:

the circular disk is directly driven to rotate, and the circular disk drives the annular disks to rotate.

6. 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.

7. The laminar flow fan according to claim 6,

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

8. The laminar flow fan according to claim 7,

the plurality of annular disks are all planar disks;

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.

9. 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.

10. The laminar flow fan according to claim 4,

the double-arc blades penetrate through the circular disk and the annular disks at even intervals.