DE102013021742B4 - Energy storage with a flywheel connected to a shaft in a rotationally fixed manner - Google Patents

Abstract

Energy storage with a flywheel (1) connected in a rotationally fixed manner to a shaft (5), the shaft (5) and/or flywheel (1) being rotatably mounted relative to a housing of the energy storage, the housing being an inner housing part (2), an intermediate part with webs (3) and an outer housing part (4), the intermediate part with webs (3) being arranged radially between the inner housing part (2) and the outer housing part (4), the webs (3) each having an angle of have more than zero degrees, the webs (3) being formed radially inwards on a hollow cylindrical base body of the intermediate part, the inner housing part (2) and the outer housing part (4) being shaped like a cup, the intermediate part being designed like a cup and the intermediate part being one Has a base section (30) which closes the hollow cylindrical base body, the outer housing part (4) having a base section (31), i.e. pot base, which extends radially and in the circumferential direction, the inner housing part (2) having at least one hollow cylindrical section, wherein the inner housing part (2) surrounds an axial section of the flywheel (1), i.e. covers or at least overlaps the area covered by the flywheel (1) in the circumferential direction and covers or at least overlaps the section covered by the flywheel (1) in the axial direction overlaps with this, the inner housing part (2) being arranged between the flywheel (1) and the intermediate part including the webs (3), the bottom sections (30) and (31) being formed by means of the pot-like design of the outer housing part (4) and the inner housing part (2). , i.e. pot bottoms of these housing parts, prevent an energy absorbent from escaping into the environment or towards the flywheel (1) in or against the axial direction.

Description

The invention relates to an energy storage device with a flywheel connected to a shaft in a rotationally fixed manner.

It is generally known that high speeds are permissible in a flywheel energy storage system and therefore high kinetic energy, i.e. rotational energy, can be stored.

From the DE 20 2012 003 348 U1 a scalable device for storing and dispensing energy is known.

From the FR 2 240 661 A5 a protective device for a flywheel is known.

The invention is therefore based on the object of developing an energy storage device in which safety should be increased, particularly in a cost-effective manner.

According to the invention, the object is achieved in the energy storage device according to the features specified in claim 1.

Important features of the invention in the energy storage are that the energy storage is provided with a flywheel connected to a shaft in a rotationally fixed manner,
wherein the shaft and/or flywheel is rotatably mounted relative to a housing of the energy storage device,
wherein the housing has an inner housing part, an intermediate part with webs and an outer housing part,
wherein the intermediate part is arranged with webs radially between the inner housing part and the outer housing part,
wherein the webs each have an angle of more than zero degrees to the radial direction, in particular an angle between 30° and 70°, in particular an angle between 40° and 60°,
in particular, the direction of rotation of the flywheel is selected such that the respective web has an angle between zero and 90° to the tangential direction, i.e. the direction tangential to the movement of the surface section of the flywheel closest to the respective web.

The advantage here is that the webs can be produced with little mass and the momentum can be dissipated when the flywheel mass acts, especially when the flywheel mass is tumbling critically. For this purpose, the webs are essentially aligned like spikes essentially against the direction of movement of the impacting outer surface section. This means that a plastic deformation of the webs can be brought about and thus impulse and energy can be dissipated. With a suitable helix angle, a domino effect can also be achieved in that a deformed, folding web also bends its neighboring web. Although the web is only at a shallow angle to the tangential direction of the tumbling, contacting outer surface section, but by means of the angular momentum, i.e. tangentially directed impulse, the web is pulled along in this direction during plastic deformation and is thus deformed towards this direction. Since the webs have a smaller distance in the circumferential direction than corresponds to their extent in the radial direction, a domino effect can be achieved.

In an advantageous embodiment, the webs touch the inner housing part. The advantage here is that the inner housing part is durable thanks to the webs and can therefore be positioned without play.

In an advantageous embodiment, the webs are regularly spaced apart from one another in the circumferential direction and/or the webs are directed radially inwards. The advantage here is that a domino effect can be achieved and simple production can be carried out.

In an advantageous embodiment, the wall thickness, particularly in the circumferential direction, is independent of the radial distance. The advantage here is that simple production can be carried out.

According to the invention, the inner housing part and/or the outer housing part is shaped like a pot. The advantage here is that penetration of energy absorbent in the axial direction can be prevented.

In an advantageous embodiment, the inner housing part is made of a brittle material, in particular glass or brittle plastic, in particular more brittle than steel or cast steel. The advantage here is that when the flywheel mass or part of it impacts, the brittle material breaks and the energy absorbent thus comes into direct contact with the flywheel mass. The kinetic energy, i.e. rotational energy, can then be at least partially absorbed by the energy absorbent. Here, a phase transition can advantageously be brought about and additional energy can therefore be absorbed because the phase transition requires energy.

In an advantageous embodiment, the outer housing part is manufactured as a cast part, in particular made of steel or cast steel. The advantage is that additional protection is available. So if the energy absorber has absorbed energy from the flywheel and previously the plastic ver After the formation of the webs has absorbed energy, the flywheel or part of the flywheel only has a portion of energy. However, this is so low that the casting cannot be destroyed by the flywheel or part of the flywheel.

According to the invention, the webs are formed radially inwards on a hollow cylindrical base body of the intermediate part, in particular in a lamellar manner. The advantage here is that the intermediate part is easy to produce.

In an advantageous embodiment, the intermediate part is made of cast steel or steel. The advantage here is that a high amount of energy can be absorbed during the plastic deformation of the intermediate part or the webs.

According to the invention, the inner housing part is designed like a pot and/or the intermediate part has a bottom section which closes the hollow cylindrical base body. The advantage here is that leakage of the energy absorbing agent in the axial direction, in particular into the space between the rotatably mounted flywheel and the inner housing part, can be made more difficult or prevented.

In an advantageous embodiment, an energy absorbing agent is arranged between the inner housing part and the intermediate part, in particular between the webs. The advantage here is that if the inner housing part breaks brittlely, in particular if the inner housing part crumbles, direct contact between the energy absorption medium and the rotating flywheel can be brought about immediately.

In an advantageous embodiment, the energy absorbent is sand and/or granules, in particular where the energy absorbent has tin particles or particles made of a tin alloy. The advantage here is that the energy absorbent immediately crumbles out through a hole in the inner housing part towards the flywheel and thus further energy can be absorbed directly.

In an advantageous embodiment, the energy absorbing agent is solid during normal operation and in the event of damage, i.e. when absorbing the maximum permissible kinetic energy of the flywheel during normal operation, it has a phase transition, in particular it becomes liquid or gaseous. The advantage here is that energy can also be absorbed through the phase transition. The impulse can therefore be absorbed mainly by the webs and the energy mainly by the energy absorbent.

Further advantages result from the subclaims. The invention is not limited to the combination of features of the claims. For the person skilled in the art, further sensible combination options of claims and/or individual claim features and/or features of the description and/or the figures arise, in particular from the task and/or the task posed by comparison with the prior art.

• In der 1 ist eine erfindungsgemäße Vorrichtung in Schrägansicht gezeigt.
• In der 2 ist eine zugehörige Draufsicht dargestellt.
• In der 3 ist ein zugehöriger Querschnitt dargestellt.
• In der 4 ist die Vorrichtung mit explodierten Komponenten dargestellt.

The invention will now be explained in more detail using illustrations:

• In the 1 A device according to the invention is shown in an oblique view.
• In the 2 an associated top view is shown.
• In the 3 an associated cross section is shown.
• In the 4 the device is shown with exploded components.

As shown in the figures, a flywheel 1 is mounted on a shaft 5 in a rotationally fixed manner.

The shaft 5 is rotatably mounted to form a housing. The housing consists of at least one inner housing part 2 and an intermediate part with webs surrounding this radially and an outer housing part 4 surrounding this intermediate part with webs 3. The inner housing part 2 has at least one hollow cylindrical section.

The intermediate part with webs 3 is thus arranged radially between the inner housing part 2 and the outer housing part 4.

The outer housing part 4 is designed like a pot and thus has a bottom section 31, i.e. pot bottom, which extends essentially radially and in the circumferential direction.

Between the flywheel 1 and the intermediate part including webs 3, the inner housing part 2 is arranged, which surrounds an axial section of the flywheel 1, i.e. covers the area covered by the flywheel 1 in the circumferential direction or at least overlaps with it and the section covered by the flywheel 1 in the axial direction covered or at least overlapped with it.

Preferably, the inner housing part 2 is non-positively connected, in particular press-fitted, to the intermediate part with webs 3. The outer surface of the inner housing part 2 in the radial direction therefore touches that in the radial direction inner surface of the intermediate housing part, i.e. the webs 3.

The outer housing part 4 is preferably manufactured as a cast part, in particular as a cast steel part, or as a machined steel part.

The inner housing part 2 is preferably made of a brittle material. The webs 3 formed on the intermediate part touch the inner housing part 2 on its radially outer surface section. The inner housing part 2 is shaped according to a hollow cylinder. The intermediate part also has a hollow cylindrical base body, which is arranged concentrically to the inner housing part 2. In particular, the inner housing part 2 and the hollow cylindrical base body of the intermediate part are spaced apart from one another in the radial direction, in particular uniformly, that is to say with a constant distance in the circumferential direction.

The webs 3 are formed on the base body and extend radially inwards, although they are not aligned purely radially, but rather obliquely, i.e. have an inclination angle.

This helix angle is between 30° and 70° in the radial direction. Depending on the specific dimensioning and choice of material as well as the maximum permissible speed of the flywheel 1, a helix angle between 40° and 60° is also advantageous.

The webs 3 are regularly spaced apart from one another in the circumferential direction. The thickness of the respective webs 3 is preferably smaller than the thickness of the gaps 6 between the webs 3 that are closest to one another. Preferably, the webs 3 each have the same wall thickness, so they are all shaped in the same way. The wall thickness is preferably independent of the radial distance.

The gaps 6 are filled with an energy absorbent. Sand or other granules are suitable for this. Particularly preferred is a granulate whose grains are made of a material that carries out a phase transition from solid to liquid when the flywheel or part of the flywheel releases energy to the energy absorbent in the event of damage. The energy to be absorbed leads to such an increase in temperature that the energy absorbent carries out a phase transition.

Tin or a tin alloy is therefore preferably suitable as granulate.

The inner housing part 2 is preferably made of a brittle material, so that when a particle of supercritical size detaches from the flywheel 1 is impacted or when the flywheel has a supercritical wobbling movement, the material breaks brittle, i.e. is fragmented into many small fragments.

Glass or a plastic that breaks brittle is suitable as a brittle material.

The helix angle of the webs 3 is selected in such a way that the angle to the trajectory of an imaginary particle detaching from the flywheel 1 at its outer edge is smaller than 30° and/or smaller than the radial direction.

In this way, a large elastic spring force counteracting a supercritically tumbling flywheel mass 1 can be generated by the webs. So if a flywheel 1 or part of the flywheel 1 hits the inner housing part 2 and it crumbles, a large impulse is introduced into the webs 3. These generate a high reactive force on the base body and thus indirectly on the outer housing part 4, because the force impulse does not occur transversely, but essentially along the webs 3. In addition, energy is introduced into the energy absorbent 6 and this also slows down the flywheel or at least partially absorbs its energy.

This means that effective burst protection can be achieved with little effort and low costs.

By means of the pot-like design of the outer housing part 4 and the inner housing part 2, the bottom sections 30 and 31, i.e. pot bottoms of these housing parts, prevent the energy absorbing agent from escaping into the environment or towards the flywheel 1, in particular in or against the axial direction.

The webs 3 have a smaller distance in the circumferential direction than corresponds to their extent in the radial direction.

Reference symbol list

1

flywheel

2

Inner housing part

3

Bridges

4

Outer housing part, pot-like

5

Wave

6

gap

30

floor section

31

floor section

Claims (11)

Energy storage with a flywheel (1) connected in a rotationally fixed manner to a shaft (5), wherein the shaft (5) and/or flywheel (1) is rotatably mounted relative to a housing of the energy storage device, wherein the housing has an inner housing part (2), an intermediate part with webs (3) and an outer housing part (4), wherein the intermediate part with webs (3) is arranged radially between the inner housing part (2) and the outer housing part (4), wherein the webs (3) each have an angle of more than zero degrees to the radial direction, wherein the webs (3) are formed radially inwards on a hollow cylindrical base body of the intermediate part, wherein the inner housing part (2) and the outer housing part (4) are pot-shaped, wherein the intermediate part is designed like a pot and the intermediate part has a bottom section (30) which closes the hollow cylindrical base body, wherein the outer housing part (4) has a bottom section (31), i.e. pot bottom, which extends radially and in the circumferential direction, wherein the inner housing part (2) has at least one hollow cylindrical section, wherein the inner housing part (2) surrounds an axial section of the flywheel (1), i.e. covers or at least overlaps the area covered by the flywheel (1) in the circumferential direction and covers or at least overlaps the section covered by the flywheel (1) in the axial direction overlaps with this, wherein the inner housing part (2) is arranged between the flywheel (1) and the intermediate part including webs (3), wherein by means of the pot-like design of the outer housing part (4) and the inner housing part (2), the bottom sections (30) and (31), i.e. pot bottoms of these housing parts, allow an energy absorbent to escape into the environment or towards the flywheel (1) in or against the axial direction prevent direction. energy storage Claim 1 , characterized in that the webs (3) touch the inner housing part (2). Energy storage according to at least one of the preceding claims, characterized in that the webs (3) are regularly spaced apart from one another in the circumferential direction and/or that the webs (3) are directed radially inwards. Energy storage device according to at least one of the preceding claims, characterized in that the inner housing part (2) is made of a brittle material. Energy storage according to at least one of the preceding claims, characterized in that the outer housing part (4) is manufactured as a cast part. Energy storage according to at least one of the preceding claims, characterized in that the intermediate part is made of cast steel or steel. Energy storage device according to at least one of the preceding claims, characterized in that an energy absorbent is arranged between the inner housing part (2) and the intermediate part. energy storage Claim 7 , characterized in that the energy absorbent is sand and/or granules. energy storage Claim 8 , characterized in that the energy absorbent has tin particles or particles made of a tin alloy. energy storage Claim 7 , characterized in that the energy absorbing agent is solid in normal operation and has a phase transition in the event of damage, i.e. when the maximum permissible kinetic energy of the flywheel (1) is absorbed in normal operation. energy storage Claim 10 , characterized in that the phase transition is directed from solid to liquid or to gaseous.

Images