Roller type energy storage device and manufacturing method thereof

Abstract

The invention discloses a roller type energy storage device which is composed of a roller body, a motor rotor and a nickel ring. The roller body is composed of a roller body, a long roller neck and a short roller neck. The motor rotor is mounted on the long roll neck in an interference manner; the nickel ring is mounted on the motor rotor in an interference manner; the length-diameter ratio of the roller body is 1.5-1.8; the diameter ratio of the roller body to the long roller neck to the short roller neck is 1: (0.1-0.3): (0.08-0.12); the manufacturing method of the roller type energy storage device comprises the steps that S1, the roller body is manufactured; and S2, mounting the motor rotor and the nickel ring in an interference manner. According to the energy storage device, a roller type structure is innovatively adopted to replace an existing disc type flywheel structure, meanwhile, the motor rotor is installed on the roller neck in an interference mode, and therefore even under the same material strength, due to the fact that the weight of a roller body is higher, the motor rotor on the roller neck can obtain the higher rotating speed, better rotating uniformity is achieved, and the energy storage effect is better. And finally, more stored energy can be obtained, and the device is suitable for higher-end application occasions.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical energy storage, and in particular relates to a roller type energy storage device and a manufacturing method thereof. Background Art

[0002] With the development of new energy generation, distributed power systems, hybrid vehicles, aerospace and other fields, energy storage technology has become a global research topic. Existing energy storage technologies mainly include mechanical energy storage, electrochemical energy storage, thermal energy storage, chemical energy storage and electromagnetic energy storage.

[0003] Existing mechanical energy storage technologies mainly include pumped storage, compressed air storage and flywheel storage; among them, flywheel energy storage devices, as a new type of energy storage technology integrating mechanical, control, electronic and other technologies, are increasingly receiving high attention at home and abroad. However, there are still many technical difficulties that restrict the engineering application of flywheel energy storage devices, mainly in the performance and control of suspension support systems and integrated high-speed / ultra-high-speed motors, which are directly related to the structure and materials of flywheel energy storage devices.

[0004] As the name suggests, a flywheel energy storage device has a flywheel-like structure, that is, a disc-type structure. Existing flywheel energy storage devices use two main types of materials: (1) composite materials, such as carbon fiber composite materials or glass fiber composite materials; (2) alloy structural steel materials, such as 4340 alloy steel.

[0005] Composite materials such as carbon fiber have the characteristics of low density and high tensile strength, but they are expensive and difficult to manufacture, especially the uniformity is difficult to control, and most of them are currently in the laboratory research stage.

[0006] Although the disc flywheel structure has a larger diameter and a higher edge speed, its rotation speed is limited (usually only around 5000 rpm) due to the low strength of the alloy structural steel material, which limits the increase in its energy storage capacity. Summary of the invention

[0007] The object of the present invention is to solve the above-mentioned problem and to provide a roller type energy storage device with higher rotation speed and more energy storage and a manufacturing method thereof.

[0008] The technical solution for achieving the purpose of the present invention is: a roller energy storage device, consisting of a roller body, a motor rotor and a nickel ring; the roller body consists of a roller body, a long roller neck and a short roller neck; the motor rotor is interference mounted on the long roller neck; the nickel ring is interference mounted on the motor rotor.

[0009] The aspect ratio of the roller body (roller body length / roller body diameter) is 1.5 to 1.8.

[0010] The diameter ratio of the roller body, the long roller neck and the short roller neck is 1: (0.1-0.3): (0.08-0.12).

[0011] The chemical composition and weight percentage of the roller body are as follows: carbon 0.40-0.43%, silicon 0.20-0.35%, manganese 0.60-0.80%, phosphorus ≤0.010%, sulfur ≤0.010%, chromium 0.90-1.00%, nickel 1.50-1.70%, molybdenum 0.25-0.35%, vanadium 0.03-0.05%, and the rest are iron and inevitable impurities.

[0012] The manufacturing method of the above roller type energy storage device comprises: S1. Manufacturing a roller body.

[0013] S2. Install the motor rotor and nickel ring by interference fit.

[0014] The method of step S1 above comprises the following steps: S11, smelting and forging long roll blanks according to the above chemical composition and weight percentage; S12, cutting the long roll blank obtained in step S11 into two short roll blanks; S13, subjecting the short roller blank to tempering and stress relief to obtain a roller body.

[0015] The method of step S2 above has the following steps: S21. First, install a nickel ring on one end of the motor rotor with interference fit.

[0016] S22. Then, the motor rotor is interference-fitted onto the long roll neck.

[0017] S23, then interference fit another nickel ring onto the other end of the motor rotor.

[0018] The manufacturing method of the roller energy storage device of the present invention is specifically as follows: electric arc furnace smelting → casting electrode rods → electrode rod turning and polishing → electrode rod electroslag remelting → forging → machining → cutting into two sections → rough machining → tempering → semi-finishing → stress removal → rough grinding → stress removal → detection of roller neck residual stress to see if it is qualified (if not, perform stress removal again) → semi-finishing grinding → interference installation of motor rotor and nickel ring → fine grinding → detection → rust prevention treatment → packaging.

[0019] When the roller type energy storage device of the present invention is used, the long roller neck faces downward, vertically downward, and the roller body rotates at a high speed to realize energy storage and energy release, which fully meets the technical requirements.

[0020] The present invention has the positive effects: (1) The energy storage device of the present invention innovatively adopts a roller structure to replace the existing disc flywheel structure, and the motor rotor is installed on the roller neck with interference fit. Therefore, even under the same material strength, due to the higher weight of the roller body, the motor rotor on the roller neck can obtain a higher rotation speed (more than 10,000 rpm) and has better rotation uniformity, and finally can obtain more energy storage, which is suitable for higher-end applications.

[0021] (2) The roller-type energy storage device of the present invention is manufactured by a conventional rolling roller manufacturing method, so that materials of various strengths can be used according to different requirements, and has a wider range of applications.

[0022] (3) When forging the roller body of the present invention, according to the structural characteristics, the roller body is first forged into a long roller blank, and then cut in half from the middle by machining, that is, one forging can be used to manufacture two roller bodies, thereby greatly improving the material utilization rate.

[0023] (4) When relieving stress, the roller body of the present invention adopts a vertical stress relief method according to the structural characteristics, thereby ensuring that the stress is fully relieved and avoiding bending of the roller neck. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic structural diagram of the roller energy storage device of Example 1.

[0025] Figure 2-1 to Figure 2-3 This is a schematic diagram of the forging process of Example 1.

[0026] Figure 3 Schematic diagram of the stress relief process of Example 1. DETAILED DESCRIPTION

[0027] (Example 1) See also Figure 1 The roller energy storage device of this embodiment is composed of a roller body 1, a motor rotor 2 and a nickel ring 3.

[0028] The roll body 1 is composed of a roll barrel 11 , a long roll neck 12 and a short roll neck 13 .

[0029] The motor rotor 2 is installed on the long roll neck 12 by interference fit, and the nickel ring 3 is installed on the motor rotor 2 by interference fit, with the interference fit of 0.4-0.55mm. The interference fit installation can ensure that the motor rotor 2 and the nickel ring 3 rotate evenly with the roller body 1, thereby achieving high-speed rotation, which is safe, reliable, and does not fall off. If a mechanical installation method (such as bolts, rivets, pins, etc.) is used, the circumferential rotation is uneven and high-speed rotation cannot be achieved. If a welding installation method is used, the residual stress is large and it is easy to deform.

[0030] The length L1 of the roller body 11 of this embodiment is 1245 mm, the diameter H is 715 mm, and the aspect ratio is about 1.74.

[0031] The length L2 of the long roll neck 12 of this embodiment is 860 mm, and the diameter is 75 to 200 mm.

[0032] The short roll neck 13 of this embodiment has a length L3 of 200 mm and a diameter of 60 to 80 mm.

[0033] The roller body 1 is made of high-strength, high-toughness low-alloy forged steel; its chemical composition and weight percentage are as follows: carbon 0.42%, silicon 0.30%, manganese 0.70%, phosphorus ≤0.010%, sulfur ≤0.010%, chromium 1.00%, nickel 1.60%, molybdenum 0.30%, vanadium 0.04%, and the rest are iron and inevitable impurities.

[0034] The manufacturing method of the roller type energy storage device of this embodiment comprises the following steps: S1. Manufacturing a roller body (1).

[0035] ① According to the above chemical composition and weight percentage, a conventional method is used to smelt and forge a long roll blank 100 [see Figure 2-1 】.

[0036] The length of the long roll blank 100 is more than twice the sum of the lengths of the roll body 11 and the short roll neck 13 .

[0037] ② Cut the long roll blank 100 obtained in step S11 into two short roll blanks 10.

[0038] Specifically, the short roll neck portion 130 is first turned out from the middle of the long roll blank 100 [see Figure 2-2 ], and then cut it in half by machining to obtain two short roller blanks 10 [see Figure 2-3 】.

[0039] That is, one forging can be used to manufacture two roller bodies of the present invention, thereby greatly improving material utilization.

[0040] ③ Carry out conventional tempering treatment on the short roller blank 10 to ensure that the roller body hardness is 40-45HSD.

[0041] After quenching and tempering treatment, since the residual stress is still high, it is necessary to carry out stress relief heat treatment at 400-480℃ more than twice during the machining process to ensure that the residual stress is ≤50MPa.

[0042] It should be noted that: unlike conventional rolling rollers, the roller body 1 of the roller body 1 of the present invention has a larger diameter, while the roller necks 12 and 13 are very small. According to the conventional horizontal placement method for stress relief, the roller neck is easy to bend, and residual stress is easy to generate after cooling.

[0043] Therefore, the present invention adopts the vertical stress relief method, which requires manufacturing a roller 200, whose height is greater than the long roller neck 12. When removing stress, the roller body 1 is placed vertically and the long roller neck 12 is placed in the roller 200 [see Figure 3 】.

[0044] S2, interference fit installation of the motor rotor 2 and the nickel ring 3; details are as follows: S21, firstly install a nickel ring 3 by interference fit (heating expansion method) on one end of the motor rotor 2.

[0045] S22, then the motor rotor 2 is interference-mounted (heat expansion method) on the long roll neck 12, with the end where the nickel ring 3 is mounted close to the roll body 11.

[0046] S23, then interference fit another nickel ring 3 (heat expansion method) to the other end of the motor rotor 2.

[0047] It should be noted that when the motor rotor 2 is installed by interference fit, an adjustable assembly rail car (see Chinese patent document CN219380532U) is required to achieve fast and accurate assembly. This is because the motor rotor 2 is heavy and cannot be picked up manually after heating. The alignment by crane is also inaccurate, the assembly angle is difficult to adjust, and the risk of assembly failure is high.

[0048] During the specific installation, first adjust the height of the trolley platform, adjust the center of the motor rotor 2 and the center of the long roller neck 12 to the same height, then place the heated motor rotor 2 on the trolley, fix it with a V-shaped iron, and push the trolley guide rail so that the motor rotor 2 can be smoothly installed and fit onto the long roller neck 12 through interference fit.

Claims

1. A roller energy storage device, comprising a roller body (1), a motor rotor (2) and a nickel ring (3); the roller body (1) comprises a roller body (11), a long roller neck (12) and a short roller neck (13); the motor rotor (2) is interference mounted on the long roller neck (12); and the nickel ring (3) is interference mounted on the motor rotor (2).

2. The roller type energy storage device according to claim 1, characterized in that: The roller body (11) has an aspect ratio of 1.5 to 1.

8.

3. The roller type energy storage device according to claim 1, characterized in that: The diameter ratio of the roller body (11), the long roller neck (12) and the short roller neck (13) is 1: (0.1-0.3): (0.08-0.12).

4. The roller type energy storage device according to claim 1, characterized in that: The chemical composition and weight percentage of the roller body (1) are as follows: carbon 0.40-0.43%, silicon 0.20-0.35%, manganese 0.60-0.80%, phosphorus ≤0.010%, sulfur ≤0.010%, chromium 0.90-1.00%, nickel 1.50-1.70%, molybdenum 0.25-0.35%, vanadium 0.03-0.05%, and the remainder is iron and unavoidable impurities.

5. A method for manufacturing a roller energy storage device according to any one of claims 1 to 4, comprising: S1, manufacturing a roller body (1); S2. Install the motor rotor (2) and the nickel ring (3) by interference fit.

6. The method for manufacturing a roller type energy storage device according to claim 5, characterized in that: The method of step S1 above comprises the following steps: S11, smelting and forging a long roll blank (100) according to the above chemical composition and weight percentage; S12, cutting the long roll blank (100) obtained in step S11 into two short roll blanks (10); S13, subjecting the short roller blank (10) to tempering and stress relief to obtain a roller body (1).

7. The method for manufacturing a roller type energy storage device according to claim 5, characterized in that: The method of step S2 above comprises the following steps: S21, firstly, a nickel ring (3) is interference-fitted onto one end of the motor rotor (2); S22, then interference-fitting the motor rotor (2) onto the long roller neck (12); S23, another nickel ring (3) is interference-fitted onto the other end of the motor rotor (2).

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