Thin-strip spiral laminated and bonded cone bottom cylinder rotor

Abstract

The utility model relates to a thin-strip spiral laminated bonded cone bottom cylinder type flywheel rotor. The flywheel rotor is mainly characterized in that circular ring laminations are made of continuous thin strips bent by a certain radian, a plurality of circular ring laminations are spirally laminated from bottom to top to form a cylinder with a conical bottom, and adjacent circular rings are adhered or welded together by using an adhesive to form a stable cone-bottom-shaped cylinder whole body, namely the flywheel rotor; the utility model mainly solves the problem that a large-size flywheel rotor is difficult to integrally construct and transport.

Description

Technical Field

[0001] The utility model mainly relates to the field of air suspension flywheel energy storage, the technical field of flywheel rotor structure and the field of material mechanics. Background Art

[0002] According to the formula for calculating the kinetic energy of a rotating object, it is known that the kinetic energy of a ring is twice that of a disk at the same mass and speed. For this reason, in the field of air suspension flywheel energy storage, we make the rotor into a hollow cylinder.

[0003] In order to improve the charging and discharging efficiency of the air-suspended flywheel energy storage device, we often make the rotor very large. In road and rail transportation, there are many restrictions on the transportation of large-sized objects. Generally, the size of road transport objects does not exceed 5m. The utility model provides a thin-strip spirally laminated and bonded conical bottom cylindrical rotor, the diameter of which can be more than 10m, and even up to 30m. And because of its conical bottom design, the lower end of the cone bottom can be directly connected to the main shaft, and the rotor gravity is directly transmitted to the main shaft (platform) through the cone bottom, so the cylinder and the main shaft do not need to be connected through a suspension beam, and it can achieve self-weight support. Summary of the invention

[0004] The above technical objectives of the utility model are achieved through the following technical solutions:

[0005] A thin-strip spirally stacked and bonded conical-bottom cylindrical rotor is made of a plurality of spiral thin strips to form continuous circular ring laminations, which are spirally stacked from the bottom to the top to form a conical-bottom cylinder, and the adjacent circular rings are bonded or welded together with an adhesive to form a conical-bottom cylinder as a whole;

[0006] Preferably, the thin strip used to make the thin strip spirally laminated and bonded conical bottom cylindrical rotor (1) is mainly made of a metal material with high tensile strength such as high-strength steel and high-performance aluminum alloy to form a metal continuous thin strip bent to a certain arc; it can also be made of composite materials such as carbon fiber reinforced material and glass fiber reinforced material, and is not limited to the above materials.

[0007] Specifically, the thin-belt spirally stacked bonded conical bottom cylindrical rotor (1) is used in conjunction with a main shaft (3), a radial limiting member (2), a bearing platform (4) and other components. The bearing platform (4) is a disc, a cylinder or other shaped member, which is fixedly mounted on the main shaft (3) and is used for connection and transmission between the thin-belt spirally stacked bonded conical bottom cylindrical rotor (1) and the main shaft (3); the conical bottom of the lower end of the thin-belt spirally stacked bonded conical bottom cylindrical rotor (1) is fixedly mounted on the bearing platform (4), and the upper end is radially limited by a radial limiting member (2), and the radial limiting member (2) can be a disc or other composite component. The center of the radial limiting member (2) is fixedly mounted on the main shaft (3), and the outer side is fixedly connected to the upper end of the thin-belt spirally stacked bonded conical bottom cylindrical rotor (1). The thin-belt spirally stacked bonded conical bottom cylindrical rotor (1) is fixedly connected to the main shaft (3), the radial limiting member (2), the bearing platform (4) and other components to form a linked whole. When the thin-belt spirally laminated and bonded conical-bottom cylindrical rotor (1) is made into a spindle shape, the connection between the upper end of the thin-belt spirally laminated and bonded conical-bottom cylindrical rotor (1) and the main shaft (3) does not need to pass through the radial limiting component (2).

[0008] In the field of air-suspended flywheel energy storage, the main force on the rotor when it rotates at high speed is centrifugal force. Due to the characteristics of the cylindrical structure, from the longitudinal section, the resultant centrifugal force is perpendicular to the longitudinal section of the rotor cylinder and acts on the two longitudinal section points, which is completely consistent with the continuous direction of the thin strip. Therefore, the thin strip can exert 100% of its mechanical properties. The transverse section of the rotor is only subject to the rotor's own gravity, so we only need to stabilize its physical shape by bonding adjacent thin strip rings with resin or other adhesives or reinforcing them by welding.

[0009] In summary, the utility model has the following beneficial effects: the utility model patent can solve the problem of flywheel rotor manufacturing and transportation difficulties in large air suspension flywheel energy storage by making thin strips into continuous spiral ring laminations and gluing or welding them into cone-bottom cylindrical flywheel rotors. In addition, most metal materials need to be forged due to their manufacturing process requirements, and forging into thin strips can maximize their physical properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a view of a spiral thin belt bonding cylinder of the utility model;

[0011] Figure 2 It is a structural schematic diagram of the spiral thin strip of the utility model;

[0012] Figure 3 It is a cross-sectional view of the installation structure of the utility model;

[0013] Figure 4 It is a schematic diagram of the spindle-shaped form of the utility model;

[0014] Figure 5 This is the force analysis diagram of the ring rotation.

[0015] In the figure, 1. a cone-bottom cylinder with spirally stacked thin strips; 2. a radial limiting member; 3. a main shaft; 4. a bearing platform. DETAILED DESCRIPTION

[0016] The utility model is further described in detail below in conjunction with the accompanying drawings, and the technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example

[0017] like Figure 1-Figure 4 As shown, a thin-strip spirally laminated and bonded conical-bottom cylindrical rotor 1 is made of a plurality of spiral thin strips into continuous annular laminations, the annular laminations are spirally laminated from the bottom to the top into a conical-bottom cylinder, and the adjacent rings are bonded or welded together with an adhesive to form a conical-bottom cylindrical whole; it is usually used in conjunction with components such as a main shaft 3, a radial limiting member 2, and a bearing platform 4.

[0018] The bearing platform 4 is usually a disc or a cylinder, which is fixedly mounted on the main shaft 3; the conical bottom of the lower end of the thin-strip spirally laminated and bonded cone-bottom cylindrical rotor 1 is fixedly mounted on the bearing platform 4, and the upper end is radially limited by a radial limiting member 2, which can be a disc body or other synthetic components. The center of the radial limiting member 2 is fixedly mounted on the main shaft 3, and the outer end is fixedly connected to the upper end of the thin-strip spirally laminated and bonded cone-bottom cylindrical rotor 1. The thin-strip spirally laminated and bonded cone-bottom cylindrical rotor 1 is fixedly connected to the main shaft 3, the radial limiting member 2, the bearing platform 4 and other components to form an interlocking whole. When the thin-strip spirally laminated and bonded cone-bottom cylindrical rotor 1 is made into a spindle shape, the connection between the upper end of the thin-strip spirally laminated and bonded cone-bottom cylindrical rotor 1 and the main shaft 3 does not need to pass through the radial limiting member 2.

[0019] Preferably, the thin strip used to make the spirally laminated and bonded conical bottom cylindrical rotor 1 is mainly made of high-strength steel, high-performance aluminum alloy and other metal materials with high tensile strength to form a metal continuous thin strip bent at a certain arc; it can also be made of composite materials such as carbon fiber reinforced materials and glass fiber reinforced materials. And it is not limited to the above materials.

[0020] As a preferred solution of the present application, the thin strip used to make the spirally laminated and bonded conical bottom cylindrical rotor 1 is made of 60Si2Mn high-performance spring steel with a yield strength ≥1375Mpa and a tensile strength ≥1500Mpa. The width of the steel strip is 500mm, and the steel strip is bent at a certain arc during forming, that is, a 47.12m long steel strip naturally forms a circular ring with a diameter of about 15m after being laid flat (for ease of transportation, we can roll the steel strip into a conical steel coil with a diameter of ≤2m and a height of 500mm).

[0021] We stack several steel strips in a spiral to make a cylinder with a diameter of 15m, a thickness of 0.5m (i.e. the width of the steel strip), and a height of 21.77m (ignoring the cone bottom). Assuming the density of steel is 7.8t / m³ and the maximum linear speed of the rotor is 418m / s, calculate:

[0022] 1. Rotor mass = 15*3.1416*0.5*21.77*7.8≈4000t=4000000kg

[0023] 2. Kinetic energy of rotor = 1 / 2*4000000*418*418 / 3600000≈97069kw.h=97069000wh

[0024] 3. Unit kinetic energy of rotor = 97069000 / 4000000≈24.3wh / kg

[0025] 4. Rotor speed = 418 / (15*3.14) ≈ 8.87r / s

[0026] 5. Calculate the load of the spiral ribbon bonded cylinder

[0027] The total centrifugal force F=mv^2 / r=4000000*418*418 / (15 / 2)≈9.32*10^10n.

[0028] like Figure 5 As shown: considering the spiral thin-ribbon bonded cylinder as two cut-open semicircular rings, the centrifugal force of each semicircular ring is 9.32*10^10n / 2=4.66*10^10n.

[0029] To further calculate the centrifugal force in the cross-sectional direction, the half ring is divided into two 1 / 4 sectors, and each 1 / 4 sector is divided into 90 equal parts. The average coefficient of the semicircular force = (sin1 + sin2 + sin3 + ... sin88 + sin89 + sin90) / 90 ≈ 0.642. The results of the left and right sectors are the same, so the centrifugal force in the cross-sectional direction is about 64.2% of the total centrifugal force of the semicircular ring. Semicircular centrifugal force = 4.66*10^10*0.642≈2.992*10^10n.

[0030] The cross-sectional area of ​​the split cylinder = 21.77*0.5㎡, and the sum of the two cross-sections = 21.77*0.5*2=21.77㎡.

[0031] The load of the cross section = 2.992*10^10n / 21.77㎡≈1374Mpa, which is close to the ultimate yield strength of 60Si2Mn high-performance spring steel. Even if the rotor is made of 60Si2Mn high-performance spring steel, the theoretical ultimate energy storage density can reach 24.3wh / kg.

[0032] The thin strip used to make the spirally laminated and bonded conical bottom cylindrical rotor 3 is made of 60Si2Mn high-performance spring steel with a yield strength of ≥1375Mpa and a tensile strength of ≥1500Mpa. The width of the steel strip is 750mm. The steel strip is bent at a certain arc during forming, that is, a 31.416m long steel strip naturally forms a ring with a diameter of about 10m after being laid flat (for ease of transportation, we can roll the steel strip into a conical steel coil with a diameter of ≤2m and a height of 750mm).

[0033] We stack several steel strips in a spiral to make a cylinder with a diameter of 10m, a thickness of 0.75m (the width of the steel strip), and a height of 21.77m (ignoring the cone bottom). Assuming the density of steel is 7.8t / m³ and the maximum linear speed of the rotor is 418m / s, we can calculate:

[0034] 1. Rotor mass = 10*3.1416*0.75*21.77*7.8≈4000t=4000000kg

[0035] 2. Kinetic energy of rotor = 1 / 2*4000000*418*418 / 3600000≈97069kw.h=97069000wh

[0036] 3. Unit kinetic energy of rotor = 97069000 / 4000000≈24.3wh / kg

[0037] 4. Rotor speed = 418 / (10*π)≈13.3r / s

[0038] 5. Calculate the load of the spiral ribbon bonded cylinder

[0039] The total centrifugal force F=mv^2 / r=4000000*418*418 / 5≈1.398*10^11n.

[0040] If the spiral thin ribbon bonded cylinder is regarded as two semicircular rings cut apart, the centrifugal force of each semicircular ring is 1.398*10^11n / 2=6.99*10^10n. The resultant centrifugal force in the cross-sectional direction is about 64.2% of the total centrifugal force of the semicircular rings = 6.99*10^10*0.642=4.487*10^10n.

[0041] The cross-sectional area of ​​the split cylinder = 21.77*0.75, the sum of the two cross-sectional areas = 21.77*0.75*2 = 32.655㎡,

[0042] The load of the cross section = 4.487*10^10n / 32.655㎡≈1374Mpa, which is the same as in Example 1.

[0043] By comparing with Scheme 1, the data of Scheme 2 is basically the same as that of Scheme 1. The only difference is the rotation speed. The rotation speed of Scheme 2 is 1.5 times that of Scheme 1.

[0044] In the field of air suspension flywheel energy storage, since the gravity and rotation of the rotor are transmitted to the pressure-bearing components in the high-pressure cylinder through the main shaft, the faster the rotor rotates, the faster the speed of the pressure-bearing components. Since the gravity of the rotors in Scheme 1 and Scheme 2 is the same, their cylinder inner diameters are also the same, but the speed ratio of the pressure-bearing components in Scheme 2 is 1.5 times that of Scheme 1. According to the principles of aerodynamics, the friction power consumption in the cylinder of Scheme 2 is 2.25 times that of Scheme 1.

[0045] The thin strip used to make the spirally laminated and bonded conical bottom cylindrical rotor 3 is made of high-performance aluminum alloy 7075 with a tensile strength of ≥570Mpa. The width of the aluminum strip is 1383mm. The aluminum strip is bent at a certain arc during molding, that is, a 47.12m long aluminum strip naturally forms a circular ring with a diameter of about 15m after being laid flat.

[0046] We stack several aluminum strips in spirals to make a cylinder with a diameter of 15m, a thickness of 1.383m (width of the aluminum strips), and a height of 21.77m (ignoring the cone bottom). Assuming the density of aluminum is 2.82t / m³ and the maximum linear speed of the rotor is 445m / s, calculate:

[0047] 1. Rotor mass = 15*3.1416*1.383*21.77*2.82≈4000 tons = 4000000 kg

[0048] 2. Kinetic energy of rotor = 1 / 2*4000000*445*445 / 3600000≈110014kw.h=110014000wh

[0049] 3. Unit kinetic energy of rotor = 110014000 / 4000000≈27.5wh / kg

[0050] 4. Rotor speed = 445 / (15*3.14) ≈ 9.45r / s

[0051] 5. Calculate the load of the spiral ribbon bonded cylinder

[0052] The total centrifugal force F=mv^2 / r=4000000*445*445 / 7.5≈1.056*10^11n.

[0053] The spiral thin ribbon bonding cylinder is regarded as two semicircular rings cut apart, and the centrifugal force of each semicircular ring is 1*10^11n / 2=5.28*10^10n. The resultant centrifugal force in the cross-sectional direction is about 64.2% of the total centrifugal force of the semicircular rings = 5.28*10^10*0.642=3.39*10^10n.

[0054] The cross-sectional area of ​​the cylinder split into two parts = 21.77*1.383, and the sum of the two cross-sectional areas is ≈ 60.22 m2

[0055] The load of the cross section = 3.39*10^10n / 60.22㎡≈562.9Mpa, which is close to the ultimate tensile strength of 7075 high-performance aluminum alloy. Even if the rotor is made of 7075 high-performance aluminum alloy, the theoretical ultimate energy storage density can reach 27.5wh / kg.

[0056] Conclusion: By comparing with Scheme 1 and Scheme 2, the energy storage density of rotors made of high-performance aluminum alloy is not much different from that of rotors made of high-strength steel. It is known that the price per unit mass of high-performance aluminum alloy is 3-4 times that of high-strength steel at this stage. Therefore, the cost-effectiveness of using high-strength steel to make rotors is relatively higher at this stage.

[0057] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A thin-strip spirally laminated and bonded conical-bottom cylindrical rotor, characterized in that include: The thin-strip spirally stacked and bonded conical-bottom cylindrical rotor (1) is made of a plurality of spiral thin strips to form continuous annular laminations, the annular laminations are spirally stacked from the bottom to the top to form a conical-bottom cylinder, and adjacent rings are bonded or welded together with an adhesive to form a conical-bottom cylinder as a whole.

2. The thin-strip spirally laminated and bonded conical-bottomed cylindrical rotor according to claim 1, characterized in that: The thin strip used to make the thin strip spirally laminated and bonded conical bottom cylindrical rotor (1) is a continuous thin strip bent to a certain arc made of one of high-strength steel, high-performance aluminum alloy, carbon fiber reinforced material or glass fiber reinforced material.

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