CN2384807Y - Polygonal section energy-storage flywheel - Google Patents

Abstract

The utility model relates to an energy storage flywheel of a polygon sectional plane, the polygon sectional plane is in the shape of a shuttle, an R is the maximum radius of the outer edge of the flywheel, an H is the half height at the center of the flywheel, an L is the external diameter of a connection platform of the flywheel, and an h is the half thickness of the outer edge of the flywheel; the sizes satisfy the following relation: h: H = 2-15: 100, L: R= 2-12: 100, H: R= 2-10: 100, and the connection platform on the utility model brings convenience for the connection of a plurality of flywheels and the connection of the flywheel and a synchronous motor. If maraging steel is used, the allowable stress is high, the rotating speed is rapid, and the design and the calculation are simple.

Description

The accumulated energy flywheel of polygonal cross-section

The utility model relates to a kind of accumulated energy flywheel of polygonal cross-section, belongs to technical field of vehicle manufacture.

The flywheel energy storage that utilizes high speed rotating is a very ancient topic.But be not easy because the mechanical energy of flywheel energy storage converts other forms of energy to, therefore, the twentieth century previous decades is very big technological breakthrough and practicability never.

The seventies later stage in this century, because the development of permagnetic synchronous motor and power inverter technology is very easy to the conversion of mechanical energy and electric energy, and practicability.Permagnetic synchronous motor is connected with flywheel, electric energy is inputed or outputed flywheel, make the mechanical energy of the flywheel of rotation be transformed into the electric energy that is easy to use by permagnetic synchronous motor.Now, utilize flywheel energy storage to become a reality.Flywheel energy storage is a kind of mechanical energy storing device, also is flying wheel battery or flywheel power supply (mechanical energy battery).Since 1980's, about the existing a large amount of application of the patent of the manufacture view of flywheel energy storage and flywheel, as U.S. US4408500, US5695584, US5566588 or the like.The spy of Japan opens flat 6-210748

The groundwork of flywheel energy storage is to utilize the kinetic energy of article for rotation

In the formula 1: E: the kinetic energy of flywheel

J: the rotor inertia of flywheel, relevant with the cross sectional shape of the quality of flywheel material and flywheel.

ω: flywheel rotational angular.

The size of the energy of flywheel storage is directly proportional with the rotor inertia J of flywheel and square ω 2 of flywheel rotational angular.Flywheel in case make is finished, and its rotor inertia just determined, the rotating speed that improves flywheel can make flywheel improve the mechanical energy that stores with the speed of rotating speed square.But the rotating speed of flywheel can not unlimited raising.This is because rotating speed is high more, the stress that material bore is caused by centnifugal force in the flywheel also with the rotating speed of flywheel with rotating speed square rule increase.When the rotating speed of flywheel was brought up to internal stress that flywheel causes by centnifugal force greater than the limit permissible stress of the material of flywheel, flywheel can destroy.At this moment flywheel rotating speed is destroying rotating speed (flywheel).When the rotating speed of flywheel was very high, the energy of flywheel was very big, and unexpected destruction can set off an explosion.The cross sectional shape of flywheel has not only determined the size of the rotor inertia of flywheel, but also the internal stress of decision flywheel distributes.Good cross sectional shape can make flywheel under certain rotating speed, and internal stress distributes more even, and maximum internal stress is less.That is to say that under the condition that the maximum permissible stress of flywheel material is determined, good cross sectional shape can make flywheel be operated in high rotational speed, stores bigger energy.So the maximum permissible stress of flywheel material and the cross sectional shape of flywheel will determine the energy storage size of flywheel.

For the size of the object stored energy of comparative unit quality (weight), can utilize the notion of specific energy, that is: $e=E/m------<2>$

E wherein: unit mass specific energy

E: the gross energy that the energy storage object is stored

M: the total mass that the energy storage object is comprised

Formula 2 is applicable to the object of various energy storage modes, as the flywheel energy storage, and chemical energy storage, heat accumulation and accumulator are put or the like.

For example: the specific energy of lead-acid battery is at present: 30-50WH/KG

The zinc-air battery specific energy is: 400WH/KG

Utilize flywheel energy storage, need to satisfy:

1, specific energy e is big as far as possible.

2, strength of material height, design easily, processing.

3, the shape of flywheel is convenient to connect, and installs.

At present, the material that most of patents are used is the carbon fiber mixed material, or Kev draws nylon material (kevlar), the shortcoming of this class material is to process, mechanical property is a non-isotropy, during the flywheel high speed rotating distortion bigger, more with the connectivity problem of turning cylinder.And the flywheel cross sectional shape with above-mentioned material scarcely is the cross sectional shape of optimum specific energy.Though the patent that has has adopted isotropic material, as US4408500, the cross sectional shape complexity is connected inconvenience with turning cylinder, when changing radius size simultaneously, because stress does not have geometric similarity, also will carry out complicated design calculation.And, neither be maximum by the specific energy of the flywheel in the cross section of above-mentioned proprietary design.

The purpose of this utility model is the accumulated energy flywheel of a kind of polygonal cross-section of design, adopt the most frequently used isotropic material, utilize the polygonal cross-section shape to make accumulated energy flywheel, make its easy connection, and in polygonal cross-section, have a bigger specific energy, design easily for the flywheel of different radii size.

The accumulated energy flywheel of the utility model design-calculated polygonal cross-section, this polygonal cross-section is a fusiformis, establishing R is the maximum outer rim radius of flywheel, H is flywheel center half height, L is the connection platform outside dimension of flywheel, and h is a flywheel outer rim half thickness, and above-mentioned size satisfies following relationship:

h∶H＝2-15∶100

L∶R＝2-12∶100

H∶R＝2-10∶100

The accumulated energy flywheel of the utility model design-calculated polygonal cross-section, the connection platform on it is convenient to the connection of a plurality of flywheels, be convenient to being connected of flywheel and synchronous dynamo, and design calculation is simple.

Description of drawings:

Fig. 1 is the cross sectional shape figure of the utility model design-calculated polygonal cross-section accumulated energy flywheel.

Fig. 2 is the first quartile section drawing of accumulated energy flywheel.

Among Fig. 1 and Fig. 2, the Z axle is the main shaft of the S. A. of flywheel, and the r axle is perpendicular to the plane axis of Z axle.

The maximum outer rim radius of R flywheel is with the S. A. vertical direction.

H flywheel center maximum ga(u)ge (highly), the S. A. direction.

The connection platform outside dimension of L flywheel.

The outer edge thickness of h flywheel.

The ratio of the characteristic dimension of flywheel is as follows: $\frac{h}{H}=\frac{2~15}{100}-----\left(3\right)$ $\frac{L}{R}=\frac{2~12}{100}-----\left(4\right)$ $\frac{H}{R}=\frac{2~10}{100}-----\left(5\right)$ Design-calculated flywheel cross sectional shape is the flywheel that has big specific energy in polygonal cross-section according to the above ratio.

Giving ρ, R under the numerical value of σ, determines in formula (3) (4) (5) given range

Numerical value after, by tentative calculation, utilize finite element method, obtain in the constraint of permissible stress σ maximum flywheel angular velocity omega.If the given parameter constant of formula (3) (4) (5), under given maximum permissible stress condition, this polygonal cross-section has geometric similarity under the garden radius condition outside difference.Promptly when finding after the optimum polygonal cross-section shape under the radius (original calculation), can be by the size (similar calculating) of the polygonal cross-section shape of other radiuses of principle design of geometrical similarity, thereby, can simplify the design calculation of flywheel.Under the given condition of the maximum permissible stress of material, have to the flywheel size and the rotating speed of similar calculating with rotating speed for the flywheel size of original calculation: $\frac{{\mathrm{\&omega;}}_1}{{\mathrm{\&omega;}}_0}=\frac{R_0}{R_1}-----<6>$

ω ₀: the flywheel rotational angular of original calculation.

R ₀: the outer rim radius of the flywheel of original calculation.

ω ₁: the flywheel rotational angular of similar calculating.

R ₁: the outer rim radius of the flywheel of similar calculating.

When the radius of wanting the design-calculated flywheel was greater than or less than the flywheel radius of original calculation, the sectional dimension of flywheel was by aforementioned 2 designs, and the maximum speed of flywheel is (6) design then by formula.

Embodiment of the present utility model is:

Embodiment 1:R=0.095m L=0.004m H=0.006m h=0.0003m

Embodiment 2:R=0.0475m L=0.002m H=0.003m h=0.00015m

If use maraging steel, permissible stress is 2400 MPas, and then the maximum speed of revolution of example (1) is: 124035 rev/mins, the high specific energy is: 69.21W.h/kg.Example (2) is used and example (1) same material, and sectional dimension ratio (1) is little, but specific energy is the same.The maximum speed of example (2) flywheel is the twice of example (1).

Claims (1)

1, a kind of accumulated energy flywheel of polygonal cross-section is characterized in that this polygonal cross-section is a fusiformis, and establishing R is the maximum outer rim radius of flywheel, H is flywheel center half height, L is the connection platform outside dimension of flywheel, and h is a flywheel outer rim half thickness, and above-mentioned size satisfies following relationship:

h∶H＝2-15∶100

L∶R＝2-12∶100

H∶R＝2-10∶100

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