CN104015719A

CN104015719A - Aerodynamic flotation device

Info

Publication number: CN104015719A
Application number: CN201410253050.0A
Authority: CN
Inventors: 潘晓江
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-09
Filing date: 2014-06-09
Publication date: 2014-09-03
Anticipated expiration: 2034-06-09

Abstract

The invention relates to an aerodynamic flotation device which is characterized by comprising a rotary disc, a fixed disc and a power mechanism supported on the fixed disc. The rotary disc is arranged to be circular, and the upper end face of the rotary disc is molded to form a smooth revolution surface. The rotary disc is arranged above the fixed disc and connected with the power mechanism in a driven mode through a rotating shaft; a 0 mm-5 mm gap is formed between the fixed disc and the rotary disc; the aerodynamic flotation device further comprises a vacuum generation device capable of discharging air between the fixed disc and the rotary disc. When the power mechanism drives the rotary disc to rotate relative to the fixed disc, a low-pressure area is formed between the fixed disc and the rotary disc under the effect of the vacuum generation device. By means of the aerodynamic flotation device, the density of the air on the front face and the back face of the aerodynamic flotation device is changed, and upward lift force is obtained. The aerodynamic flotation device is applied to a weight, and the aim of enabling the weight to float in air is accordingly achieved. In addition, the aerodynamic flotation device is simple in structure, low in manufacturing cost and small in energy consumption, and brings convenience to large-scope application and popularization.

Description

Aerodynamic flotation device

Technical Field

The invention relates to a power auxiliary device which can be used on airplanes, ships and vehicles, in particular to an aerodynamic floating device.

Background

The existing vehicles such as airplanes, ships, vehicles and the like rely on gasoline or diesel engines to provide power when running, so that the energy consumption is high, the gasoline, the diesel and the like which depend on the vehicles belong to non-renewable resources, and from the long-term development of human, the resource consumption is reduced as much as possible. In the running process of vehicles such as airplanes, ships, vehicles and the like, the self gravity of the vehicles is overcome to the maximum extent, so that the vehicles are in a floating state, the friction between the vehicles and water flow or the road surface can be effectively reduced, and the energy consumption is reduced. The existing technology can only realize the suspension of an airplane, and ships, vehicles and the like cannot be in a floating state. In addition, the flying off of the plane from the ground is also realized by means of the fixed wings, the lifting force of the fixed wing type plane during the flying off needs to be obtained by depending on the advancing speed of the plane, and in order to enable the fixed wing type plane to have enough speed, a runway with a certain length needs to be specially arranged for run-up, so that not only are the manpower and material resource resources wasted, but also the running runway cannot be separated during the flying off and landing of the plane, so that the accidents of multiple planes are caused. The existing rotor helicopter can take off without depending on a run-up runway, but has high manufacturing cost, large energy consumption and limited flying distance, and is difficult to popularize as a common vehicle.

Disclosure of Invention

The invention aims to solve the technical problem of providing an aerodynamic floating device which has low manufacturing cost and low energy consumption and can float heavy objects in the air aiming at the current situation of the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: an aerodynamic flotation device characterized by: the rotary table is round, and the upper end surface of the rotary table is formed into a smooth revolution curved surface; the rotary disc is arranged above the fixed disc and is in driving connection with the power mechanism through a rotating shaft; a gap of 0 mm-5 mm is formed between the fixed disc and the rotary disc; and the vacuum generating device can exhaust air between the fixed disc and the rotating disc.

As a further improvement of the invention, the gap is positioned at the edge of the turntable, which is close to the upper surface of the fixed plate, between the lower surface of the turntable and the upper surface of the fixed plate, an inner cavity is formed between the turntable and the fixed plate inside the gap, and the height of the inner cavity is greater than that of the gap. For the device, the smaller the gap between the fixed disc and the rotary disc, the better the gap size is, and during actual manufacturing, the smaller the gap between the fixed disc and the rotary disc, the higher the production difficulty is, and friction is easy to exist between the fixed disc and the rotary disc with similar distances, so that the material is seriously abraded, and the production cost is increased; by adopting the structure, the inner cavity avoids large-area abrasion between the fixed disc and the rotary disc, the requirement can be met only by reducing the edge distance of the corresponding end surfaces on the fixed disc and the rotary disc, and the production and manufacturing difficulty is reduced.

Preferably, the vacuum generating device comprises an air exhaust hole and a vacuum pump, the air exhaust hole is formed in the fixed plate and communicated with the inner cavity, and an air exhaust end of the vacuum pump is connected with the air exhaust hole. By adopting the structure, the vacuum pump is utilized to pump out the air in the inner cavity to form a low-pressure cavity, which is beneficial to increasing the lifting force of the device.

Preferably, the vacuum generating device is provided with a plurality of pore channels which are arranged on the peripheral surface of the turntable and face the center of the turntable, and the tail ends of the pore channels extend downwards to be communicated with the inner cavity. The pore channels are arranged at intervals along the circumferential direction of the turntable, when the turntable rotates, the linear velocity on the circumferential surface is greater than that near the center, therefore, the air pressure at the pore channel on the circumferential surface is lower than that at the pore channel near the center, the air in the inner cavity flows outwards through the pore channels, and the inner cavity generates low pressure.

Furthermore, a circular ring piece is sleeved on the outer peripheral surface of the fixed disc and is detachably connected with the fixed disc, and a gap is formed between the upper end of the circular ring piece and the rotary disc. Preferably, the upper part of the circular ring part is provided with a plurality of connecting parts which are inwards protruded, each connecting part is provided with a mounting hole, correspondingly, the fixed disc is provided with a threaded hole, and a screw rod penetrates through the mounting hole and is in threaded connection with the threaded hole. Because when actual production was made, the gap between fixed disk and the carousel is the less big more the production degree of difficulty, in order to reduce the production degree of difficulty, adopts above-mentioned structure, in the use, even if produced wearing and tearing and make the gap increase, also can drive the ring spare and shift up through rotatory screw rod to adjust the gap distance between carousel and the fixed disk, in order to reach the within range of injecing conveniently.

In order to prevent air from flowing between the circular ring piece and the outer periphery of the fixed disc, at least one sealing ring is arranged between the outer periphery of the fixed disc and the inner periphery of the circular ring piece.

Preferably, a circumferential groove is formed in the edge, close to the upper end face of the fixed plate, at least one channel communicated with the outside atmosphere is formed in the bottom of the groove, an annular piece can be inserted into the groove in an up-and-down moving mode, and the gap is formed between the upper end of the annular piece and the rotary plate. When the annular member is used, the annular member can be adjusted to enable the gap to be a small size, when the air density in the inner cavity is lower than that of the outside, air firstly passes through the gap to generate a certain flow velocity, so that upward suction is generated on the upper plane of the annular member, the gap is made smaller, but when the gap between the upper plane of the annular member and the rotating disc is small, the flow velocity of the air flowing through the gap is reduced, the upward suction of the annular member is reduced, the annular member moves downwards under the action of self gravity, and therefore the gap can be kept within a proper range, namely, strong friction is avoided, and the small gap can be kept, so that the inner cavity has stable low pressure.

Preferably, a ring member is sleeved on the outer peripheral surface of the fixed plate and detachably connected with the fixed plate, a circumferential groove is formed in the edge, close to the upper end face, of the ring member, at least one channel communicated with the outside atmosphere is formed in the bottom of the groove, the ring member can be inserted into the groove in an up-and-down moving mode, and the gap is formed between the upper end of the ring member and the rotary plate. By adopting the structure, the manual adjustment of the gap width is combined with the automatic air flow adjustment, so that a better effect is achieved.

Preferably, the fixed plate is provided with a through hole for the rotating shaft to pass through, and a bearing and an airtight piece are arranged between the through hole and the rotating shaft.

Compared with the prior art, the aerodynamic floating device comprises the rotating disc, the fixed disc and the power mechanism, so that when the power mechanism drives the rotating disc to rotate relative to the fixed disc, a low-pressure area is formed between the fixed disc and the rotating disc under the action of the vacuum generating device, and according to the Bernoulli equation, when the fluid speed is increased under the action of atmospheric pressure, the pressure on an interface of an object and the fluid is reduced, otherwise, the pressure is increased.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of example 2 of the present invention;

FIG. 3 is an enlarged schematic view of portion A of FIG. 2;

FIG. 4 is a schematic structural diagram of embodiment 3 of the present invention;

FIG. 5 is an enlarged schematic view of portion B of FIG. 4;

FIG. 6 is a schematic structural view of example 4 of the present invention;

FIG. 7 is an enlarged view of the portion C of FIG. 6;

FIG. 8 is a schematic structural view of example 5 of the present invention;

fig. 9 is a sectional view taken along a-a direction in fig. 8.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

Example 1:

as shown in fig. 1, the aerodynamic floating device of the present embodiment includes a rotating disc 1, a fixed disc 2, an actuating unit (not shown) and a vacuum generating device, wherein the rotating disc 1 and the fixed disc 2 are both circular, and the upper end surface of the rotating disc 1 is formed into a smooth surface of revolution, so as to ensure that all parts on the rotating disc 1 are uniformly stressed; the turntable 1 is arranged above the fixed disc 2 and can rotate relative to the fixed disc 2, the turntable 1 is in driving connection with the power mechanism through a rotating shaft 4, a through hole 21 for the rotating shaft 4 to pass through is formed in the fixed disc 2, and a bearing 40 and an airtight piece 41 are arranged between the through hole 21 and the rotating shaft 4; a gap 10 is formed between the fixed disc 2 and the rotating disc 1, and the width H of the gap 10 is 0 mm-5 mm. In this embodiment, the gap 10 is located between the lower end surface of the turntable 1 and the edge of the upper end surface of the fixed plate 2, an inner cavity 20 is formed between the turntable 1 and the fixed plate 2 inside the gap 10, and the height W of the inner cavity 20 is greater than the width H of the gap 10, so that as long as the machining precision of the edges of the lower end surface of the turntable 1 and the upper end surface of the fixed plate 2 is ensured, the size requirement of the gap can be met, the machining precision between the turntable 1 and the fixed plate 2 is reduced, and the friction between the turntable 1 and the fixed plate 2 in the rotation process is avoided; the vacuum generating device of the embodiment includes an air exhaust hole 31 and a vacuum pump (not shown), the number of the air exhaust hole 31 may be one or more, the air exhaust hole 31 is opened on the fixed plate 2 and is communicated with the inner cavity 20, and an air exhaust end of the vacuum pump is connected to the air exhaust hole 31.

The mechanism of this example is as follows: according to the principle of aerodynamics, the higher the air flow speed, the lower the pressure, and conversely, the lower the flow speed, the higher the pressure, when the air flows across the surface of the object, a lift force which is perpendicular to the air flow direction and far away from the surface of the object is generated, and the mathematical expression is as follows:

P＝ρ₀ν²S/2

wherein,

p is a lift vector of the surface of the object perpendicular to the airflow direction;

ρ₀is the density of air (kg/m)³)；

V is the speed (m/s) of the movement of the object;

s is the area of action (m) of the object and the air flow²)；

When a circular object rotates in the air, the lift force of the air on the circular surface can be expressed as:

P＝ρ₀·f(ν,S)/2

wherein, velocity v and area S are both functions of variable r, namely: v 2 pi nr, S2 pi r · Δ r, Δ r is an integral variable, and is obtained by integration:

P＝ρ₀·π³·n²·r⁴

wherein,

n is the speed of rotation of the object (revolutions per second);

r is the radius (m) of the object;

in general, since the areas of the front surface and the back surface of a circular object rotating in the air are equal, the angular velocities are equal, and the air densities are equal, the applied lift forces are equal and opposite, and the applied lift forces are 0 (or very small); if the air density on the front and back surfaces of the round object is not equal, the force on the two surfaces is not equal. If the air density on the front surface of the circular object is ρ ', the air density on the back surface is ρ ", and the aerodynamic force on the front surface of the circular object is P', then:

P’＝ρ’·π³·n²·r⁴

the aerodynamic force on the reverse side of the circular object is P ″, then:

P”＝ρ”·π³·n²·r⁴

obviously, P_{Resultant force}＝P’-P’’＝ρ’·π³·n²·r⁴-ρ”·π³·n²·r⁴

＝(ρ’-ρ”)π³·n²·r⁴

The force analysis of the flotation device of this embodiment according to the above formula is as follows:

as shown in fig. 1, air pressure is applied vertically to both the upper and lower surfaces of the turntable 1 and the upper and lower surfaces of the stator 2. The pressure on each side of the device is also subject to pressure in all directions of the air, and because these forces are always equal and opposite, the pressure on each side of the device is not considered. Assuming ambient air density of ρ₀Pressure of p₀The pressure P acting above the turntable 1₁Equal to the pressure p generated by the ambient air pressure₀The difference between S and the lift force of the turntable 1 is:

P₁＝p₀S-ρ₀·π³·n²·r⁴in the downward direction

Assuming the air density of the lumen is ρ₁Pressure of p₁The pressure P acting below the turntable 1₂Equal to the gas pressure p in the inner chamber₁The difference between S and the downward lift force generated by the rotation of the turntable 1 is as follows:

P₂＝p₁S–ρ₁·π³·n²·r⁴in the upward direction

Since the fixed plate does not rotate, a pressure P acting on the upper side of the fixed plate 2₃Equal to ρ sealed in the inner cavity₁Pressure p generated by the air₁S, namely:

P₃＝p₁s, direction is downward

Similarly, since the fixed plate does not rotate, the pressure P acting below the fixed plate 2₄Equal to the pressure p generated by the ambient air pressure₀S is that:

P₄＝p₀s, direction is upward

The sum P of external forces acting on the floating device_{Combination of Chinese herbs}Is equal to P₁、P₂、P₃、P₄The vector sum of (a) is:

P_{combination of Chinese herbs}＝-P₁+P₂-P₃+P₄＝(ρ₀–ρ₁)π³·n²·r⁴In the upward direction

It can be seen from the above equation that when the radius r and the speed n of the turntable 1 are constant, as long as the air density ρ in the cavity is constant₁Air density p less than ambient₀The device will generate an upward lift, and rho₁The smaller the lift force, the larger the lift force, so that the air in the inner cavity is pumped out by the vacuum generating device in the embodiment, and the inner cavity is formed into a low-pressure cavity which is nearly vacuum, so that the floating device in the embodiment can obtain a sufficiently large upward lift force to float in the air.

It is to be noted that ρ₁Not possible to be less than 0, the diameter 2r of the turntable 1 and the speed n are also subjected to p₁The limit is that the speed of the outer edge of the rotating disk 1 can be controlled to be about the speed of sound.

Example 2:

according to P acting on the floating device in example 1_{Combination of Chinese herbs}As can be seen from the equation, when the width H of the gap 10 between the fixed disk 2 and the rotating disk 1 approaches 0, ρ₁0, which is an ideal situation in which the floating device can obtain an upward lifting force without the need for a vacuum generating device, but this cannot be achieved, and therefore, the gap 10 between the fixed plate 2 and the rotating plate 1 can be made as small as possible, which is practicalDuring manufacturing, the smaller the gap 10 between the fixed disc 2 and the rotary disc 1 is, the higher the production difficulty is, and friction is easy to exist between the fixed disc 2 and the rotary disc 1 with similar distances, so that the material abrasion is serious, and the production cost is increased; in actual operation, as the turntable 1 rotates, the turntable 1 inevitably rubs against the fixed plate 2 at the gap 10, and the width of the gap 10 is increased. In order to adjust the width H of the gap 10 as required at any time, as shown in fig. 2 and 3, a circular ring member 5 is sleeved on the outer circumferential surface of the fixed plate 2, the circular ring member 5 is detachably connected with the fixed plate 2, the gap 10 is formed between the upper end of the circular ring member 5 and the rotating plate 1, specifically, a plurality of connecting portions 51 are inwardly and convexly arranged at the upper portion of the circular ring member 5, each connecting portion 51 is provided with a mounting hole 511, correspondingly, a threaded hole 25 is formed in the fixed plate 2, and a screw 50 is arranged in the threaded hole 25 and the mounting hole 511 in a penetrating manner, in the using process, the screw 50 is rotated upwards to drive the circular ring member 5 to move upwards, so that the width H of the gap 10 between the rotating plate 1 and the fixed plate 2 is adjusted. In order to prevent air from flowing between the circular ring member 5 and the outer periphery of the fixed disc 2, at least one sealing ring 6, 2 in this embodiment, is further provided between the outer periphery of the fixed disc 2 and the inner periphery of the circular ring member 5.

Example 3:

this example differs from example 1 in that: as shown in fig. 4 and 5, in the present embodiment, a circumferential groove 23 is formed at the near edge of the upper end surface of the fixed plate 2, the bottom of the groove 23 is provided with at least one channel 24 communicating with the external atmosphere, an annular member 7 is inserted into the groove 23 in an up-and-down moving manner, a gap 10 is formed between the upper end of the annular member 7 and the rotating plate 1, the annular member 7 in the present embodiment may be an integral annular member, or may be a plurality of members forming an annular structure in segments, when in use, the annular member 7 may be adjusted to make the width H of the gap 10 between the annular member 7 and the rotating plate 1 be a small size, when the air density in the inner cavity 20 is lower than the external air density, the air first passes through the gap 10 to generate a certain flow velocity, so as to generate an upward suction force on the upper plane of the annular member 7, and make the gap 10 become smaller, but when the gap 10 between the upper plane of the annular member 7, the velocity of the air flowing through the gap 10 decreases and the suction force of the ring 7 in the upward direction decreases, and the ring 7 moves downward by its own weight, so that the gap 10 can be maintained within a suitable range, i.e. strong friction is avoided, and the gap 10 can be kept small so that the inner cavity has a stable low pressure.

Example 4:

this example differs from example 1 in that: as shown in fig. 6 and 7, in the present embodiment, a circular ring member 5 is sleeved on the outer circumferential surface of the fixed plate 2, the circular ring member 5 is detachably connected with the fixed plate 2, specifically, the upper portion of the circular ring member 5 is provided with a plurality of connecting portions 51 protruding inwards, each connecting portion 51 is provided with a mounting hole 511, correspondingly, the fixed plate 2 is provided with a threaded hole 25, and a screw 50 is inserted into the threaded hole 25 and the mounting hole 511; meanwhile, in the embodiment, a circumferential groove 52 is formed at the near edge of the upper end surface of the circular ring member 5, the bottom of the groove 52 is provided with at least one channel 53 communicated with the outside atmosphere, and the circular ring member 8 can be inserted into the groove 52 in an up-and-down moving manner; the two structures are mutually matched to realize the large and small adjustment of the width H of the gap 10, and the adjustment range is more precise.

Example 5:

this example differs from example 2 in that: as shown in fig. 8 and 9, the vacuum generating device of this embodiment is a plurality of ducts 12 opened on the outer peripheral surface of the turntable 1 and facing the center of the turntable 1, the ends of the ducts 12 extend downward to communicate with the inner cavity 20, and preferably, the ends of the ducts 12 are close to the center of the turntable 1, the ducts 12 in this embodiment are arranged at intervals along the circumferential direction of the turntable 1, when the turntable 1 rotates, the linear velocity on the circumferential surface is greater than the linear velocity near the center, therefore, the air pressure at the openings of the ducts 12 on the circumferential surface is lower than the air pressure at the openings of the ducts 12 near the center, the air in the inner cavity 20 will flow out through the ducts 12, so as to generate low pressure in the inner cavity 20, and the floating device with this structure can be provided without additional vacuum pumping equipment, thereby simplifying the auxiliary equipment of the device, and expanding the.

It is further noted that in an ideal situation, i.e. when the width H of the gap 10 between the turntable 1 and the fixed plate 2 is 0, the lift generated by the floating device of the present invention is:

P_{lifting of wine}＝ρ₀·π³·n²·r⁴

According to newton's viscosity theory, the resistance generated by the upper surface of the rotating disk 1 is:

P_{resistance device}＝4π²·n·ρ₀·r³·C/3

Wherein C is the dynamic viscosity coefficient (m/s) of air;

since the rotating disk 1 has no windward area during rotation, and therefore has no windward resistance, the resistance during rotation of the rotating disk 1 mainly comes from the viscosity resistance of air, and the lift-drag ratio of the rotating disk 1 is:

P_{lifting of wine}/P_{Resistance device}＝(ρ₀·π³·n²)/(4/3π²·n·ρ₀·r³·C)＝3π·n·r/(4C)

Assuming that r is 1m and n is 50 revolutions per second, it is easy to see that the lift-drag ratio of the device is far greater than that of the traditional aircraft; if the power loss of the transmission system at the bottom of the turntable is not counted and the power loss of the upper surface of the turntable is W, W is equal to P_{Resistance device}Multiplying by the linear velocity v, P_{Resistance device}And ν is a function of the variable radius r, i.e.:

W＝C·ρ₀·f(ν²,S)

＝C·ρ₀·∫(2πnr)²·2πrdr

＝2π³·n²·r⁴·ρ₀·C

the rising speed V of the device is W/P_{Lifting of wine}＝(2π³·n²·r⁴·ρ₀·C)/(ρ₀·π³·n²·r⁴)＝2C

Obviously, this is a very small value, and it can be stated that the device can make the turntable obtain a very large lifting force with a very small driving force and a very small driving power, so that the device floats in the air without falling down, but at the same time, because of the very small driving power, the lifting speed of the device is very slow, so that the device is more suitable to be used as an auxiliary device in the processes of flying, lifting, pushing and pulling.

Although the preferred embodiments of the present invention have been described in detail, it should be clearly understood that modifications and variations of the present invention may occur to those skilled in the art, and as in the above embodiments, the diameter of the fixed plate may be made larger than that of the rotating plate, and the rotating shaft and the power mechanism of the rotating plate may be supported on a bracket, and the supporting legs of the bracket may be fixed to the fixed plate, so that there is no need to provide through holes on the fixed plate for the rotating shaft to pass through and connect with the rotating plate; for another example, the upper end surface of the turntable can be a plane or an arc surface, and the like, as long as the upper end surface is formed into a revolution curved surface, it can be ensured that all parts on the upper end surface are uniformly stressed; the adjustment of the width H of the slit is not limited to the structure mentioned in the above embodiments, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An aerodynamic flotation device characterized by: the rotary table is round, and the upper end surface of the rotary table is formed into a smooth revolution curved surface; the rotary disc is arranged above the fixed disc and is in driving connection with the power mechanism through a rotating shaft; a gap of 0 mm-5 mm is formed between the fixed disc and the rotary disc; and the vacuum generating device can exhaust air between the fixed disc and the rotating disc.

2. An aerodynamic flotation device according to claim 1, wherein: the gap is located at the edge of the turntable, which is close to the upper surface of the fixed plate, between the lower surface of the turntable and the upper surface of the fixed plate, an inner cavity is formed between the turntable and the fixed plate at the inner side of the gap, and the height of the inner cavity is greater than that of the gap.

3. An aerodynamic flotation device according to claim 2, wherein: the vacuum generating device comprises an air exhaust hole and a vacuum pump, the air exhaust hole is formed in the fixed plate and communicated with the inner cavity, and the air exhaust end of the vacuum pump is connected with the air exhaust hole.

4. An aerodynamic flotation device according to claim 2, wherein: the vacuum generating device is a plurality of pore channels which are arranged on the peripheral surface of the turntable and face the center of the turntable, and the tail ends of the pore channels extend downwards and are communicated with the inner cavity.

5. An aerodynamic flotation device according to any one of claims 1 to 4, wherein: and the annular piece is sleeved on the peripheral surface of the fixed disc and is detachably connected with the fixed disc, and a gap is formed between the upper end of the annular piece and the rotary disc.

6. An aerodynamic flotation device according to claim 5, wherein: the upper part of the circular ring piece is inwards provided with a plurality of connecting parts in an inwards protruding mode, each connecting part is provided with a mounting hole, correspondingly, the fixed disc is provided with a threaded hole, and a screw rod penetrates through the mounting holes and is in threaded connection with the threaded holes.

7. An aerodynamic flotation device according to claim 5, wherein: at least one sealing ring is arranged between the outer circumferential surface of the fixed disc and the inner circumferential surface of the circular ring piece.

8. An aerodynamic flotation device according to any one of claims 1 to 4, wherein: the annular piece is sleeved on the outer peripheral surface of the fixed disc and is detachably connected with the fixed disc, a circumferential groove is formed in the edge, close to the upper end face, of the annular piece, at least one channel communicated with the outside atmosphere is formed in the bottom of the groove, the annular piece can be inserted into the groove in an up-and-down moving mode, and the gap is formed between the upper end of the annular piece and the rotary disc.

9. An aerodynamic flotation device according to any one of claims 1 to 4, wherein: the edge of the upper end surface of the fixed disc is provided with a circumferential groove, the bottom of the groove is provided with at least one channel communicated with the outside atmosphere, an annular piece can be inserted into the groove in an up-and-down moving mode, and a gap is formed between the upper end of the annular piece and the rotary disc.

10. An aerodynamic flotation device according to any one of claims 1 to 4, wherein: the fixed plate is provided with a through hole for the rotating shaft to pass through, and a bearing and an airtight piece are arranged between the through hole and the rotating shaft.