Flywheel energy storage system with integrally forged wheel ring and wheel hub

Abstract

The utility model belongs to the field of flywheel energy storage, and particularly relates to a flywheel energy storage system for integrally forging a wheel ring and a wheel hub. The upper end cover and the lower end cover respectively cover the upper end and the lower end of the shell; bearings are arranged on the bottom surface of the upper end cover and the top surface of the lower end cover; the longitudinal section of the flywheel rotor is H-shaped; the shell, the upper end cover and the flywheel rotor are made of magnetic materials; the bottom end of the upper connecting shaft is fixed with the top surface of a thin disc in the center of the flywheel rotor; the top end of the upper connecting shaft is connected with a bearing of the upper end cover; the top end of a lower connecting shaft is fixed with the bottom surface of a thin disc in the center of the flywheel rotor; the bottom end of the lower connecting shaft is connected with a bearing of a lower end cover; the driving motor drives the upper connecting shaft or the lower connecting shaft to rotate; the magnetic ring is fixed on the bottom surface of the upper end cover. The flywheel rotor structure adopts an H-shaped integral structure, so that the flywheel rotor is more uniform during heat treatment, the strength of each part of a material is ensured to be consistent, accidents in future use are avoided, and the safety and the reliability of flywheel energy storage products are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flywheel energy storage field, concretely relates to a flywheel energy storage system of wheel ring hub integral forging. BACKGROUND

[0002] Flywheel energy storage as a kind of physical energy storage method, has been more and more attention and research.It has the advantages of good dynamic performance, no secondary pollution, etc., so it stands out among many energy storage methods.Flywheel energy storage is divided into energy storage flywheel and power flywheel.For energy storage flywheel, its energy storage capacity is generally large, and large-size alloy steel flywheel needs to be developed.However, for large-size alloy steel flywheel, considering the hardenability of the material, if the entire flywheel rotor is forged into a regular cylindrical rotor, the volume of the flywheel rotor will be too large, which will cause uneven heat treatment, affect the overall material, especially the internal mechanical properties, and reduce its safety and reliability.Therefore, how to reasonably design a large-capacity and large-volume flywheel rotor has become a problem to be solved. SUMMARY

[0003] The flywheel energy storage system of wheel ring hub integral forging provided by the utility model can effectively solve the problems in the background art.

[0004] The flywheel energy storage system of wheel ring hub integral forging provided by the utility model comprises a shell, an upper end cover, a lower end cover, a flywheel rotor, an upper connecting shaft, a lower connecting shaft, a driving motor and a magnetic ring.

[0005] The shell is sleeve-shaped; the upper end cover and the lower end cover are respectively arranged on the upper end and the lower end of the shell; the bottom surface of the upper end cover and the top surface of the lower end cover are both provided with a bearing.

[0006] The flywheel rotor is arranged in the shell; the longitudinal section of the flywheel rotor is H-shaped; the shell, the upper end cover and the flywheel rotor are made of magnetic material.

[0007] The bottom end of the upper connecting shaft is fixed to the top surface of the thin disc at the center of the flywheel rotor, and the top end of the upper connecting shaft is connected to the bearing of the upper end cover.

[0008] The top end of the lower connecting shaft is fixed to the bottom surface of the thin disc at the center of the flywheel rotor, and the bottom end of the lower connecting shaft is connected to the bearing of the lower end cover.

[0009] The driving motor is arranged in the shell, and the driving motor drives the upper connecting shaft or the lower connecting shaft to rotate.

[0010] The magnetic ring is fixed to the bottom surface of the upper end cover.

[0011] As a further optimization of the utility model, the driving motor comprises a motor stator, a motor rotor and an armature winding.

[0012] The motor rotor is sleeved on the upper connecting shaft or the lower connecting shaft and can drive the upper connecting shaft or the lower connecting shaft to rotate; the motor stator is sleeved outside the motor rotor; and the armature winding is arranged on the motor stator.

[0013] As further optimization of the utility model, it further comprises a fixing seat which is sleeve-shaped; the fixing seat is fixed on the upper end cover or the lower end cover, the fixing seat is sleeved on the outer wall of the motor stator, and an annular cooling channel is arranged in the fixing seat.

[0014] As further optimization of the utility model, it further comprises a bearing seat; the bearing seat is fixed on the fixing seat and is inserted into the bearing seat through the upper connecting shaft or the lower connecting shaft of the driving motor.

[0015] As further optimization of the utility model, it further comprises a magnetic isolation ring; the magnetic isolation ring is fixed on the upper end cover or the lower end cover, and the fixing seat is fixed on the magnetic isolation ring.

[0016] As further optimization of the utility model, the upper connecting end is arranged on the upper surface of the thin disc at the center of the flywheel rotor, and the lower connecting end is arranged on the lower surface of the thin disc; the bottom end of the upper connecting shaft is fixed with the upper connecting end; and the top end of the lower connecting shaft is fixed with the lower connecting end.

[0017] As further optimization of the utility model, the flywheel rotor has an outer wall thickness h, the thin disc has a thickness h1, the upper connecting end has a thickness h2, and the lower connecting end has a thickness h3; 1 / 6*h≤h1≤1 / 2*h, 0.8*h1≤h2, and 0.8*h1≤h3≤1.5*h1.

[0018] As further optimization of the utility model, the magnetic ring comprises a permanent magnetic ring and a ferromagnetic ring; and the ferromagnetic ring is sleeved on the inner wall and the outer wall of the permanent magnetic ring.

[0019] As further optimization of the utility model, the magnetic ring comprises a permanent magnetic ring and a ferromagnetic ring; and the ferromagnetic ring presses the permanent magnetic ring against the upper end cover.

[0020] As further optimization of the utility model, the air gap distance between the magnetic ring and the upper end surface of the flywheel rotor is L1, and the air gap distance between the outer wall of the flywheel rotor and the inner wall of the shell is L2; L2≥5*L1.

[0021] The flywheel energy storage system is characterized in that a small-power motor drives a large flywheel and belongs to a slow-charging and slow-discharging type flywheel energy storage system. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a sectional structure schematic view of example 1;

[0023] Figure 2 is Figure 1 Permanent magnet ring magnetic circuit schematic diagram;

[0024] Figure 3 is the schematic diagram of the cross-sectional structure of embodiment 2;

[0025] Figure 4 is Figure 3 Permanent magnet ring circuit schematic diagram;

[0026] Wherein, the shell 1, the upper end cover 2, the lower end cover 3, the flywheel rotor 3, the thin plate 3a, the upper connecting end 3b, the lower connecting end 3c, the upper connecting shaft 4, the lower connecting shaft 5, the driving motor 6, the motor stator 6a, the motor rotor 6b, the armature winding 6c, the fixed seat 6d, the cooling channel 6d1, the magnetic ring 7, the upper bearing 8a, the lower bearing 8b, the bearing seat 9, the magnetic ring 10, the permanent magnet ring 10a, the ferromagnetic ring 10b. DETAILED DESCRIPTION

[0027] Embodiment 1

[0028] As Figure 1 shown, the embodiment includes a shell 1, an upper end cover 2, a lower end cover 3, a flywheel rotor 3, an upper connecting shaft 4, a lower connecting shaft 5, a driving motor 6 and a magnetic ring 10.

[0029] The shell 1 is sleeve-shaped. The upper end cover 2 and the lower end cover 3 are respectively covered on the upper and lower ends of the shell 1.

[0030] The flywheel rotor 3 is made of high-strength alloy steel, and the flywheel rotor 3 has a structure of H-shaped longitudinal section. The bottom end of the upper connecting shaft 4 is fixed to the top surface of the thin plate 3a at the center of the flywheel rotor 3, specifically, an upper connecting end 3b is provided at the center of the top surface of the thin plate 3a, the upper connecting end 3b is provided with an upper connecting end counterbore, and the bottom end of the upper connecting shaft 4 is inserted into the upper connecting end counterbore for interference assembly and fixation. Similarly, the top end of the lower connecting shaft 5 is fixed to the bottom surface of the thin plate 3a at the center of the flywheel rotor 3, specifically, a lower connecting end 3c is provided at the center of the bottom surface of the thin plate 3a, the lower connecting end 3c is provided with a lower connecting end counterbore, and the top end of the lower connecting shaft 5 is inserted into the lower connecting end counterbore for interference assembly and fixation. In other embodiments, a bottom end groove can be provided at the bottom end of the upper connecting shaft 4, and the upper connecting end 3b is inserted into the bottom end groove for interference assembly and fixation; a top end groove is provided at the top end of the lower connecting shaft 5, and the lower connecting end 3c is inserted into the top end groove for interference assembly and fixation.

[0031] The upper bearing 8a is embedded at the center of the lower end surface of the upper end cover 2, and the top end of the upper connecting shaft 4 is inserted into the upper bearing 8a to connect with the upper end cover 2. Similarly, the lower bearing 8b is embedded at the center of the upper surface of the lower end cover 3, and the bottom end of the lower connecting shaft 5 is inserted into the lower bearing 8b to connect with the lower end cover 3.

[0032] In this embodiment, the flywheel rotor 3 has an outer wall thickness h, the thin plate 3a has a thickness h1, the upper connecting end 3b has a thickness h2, and the lower connecting end 3c has a thickness h3, and 1 / 6*h≤h1≤1 / 2*h, 0.8*h1≤h2, and 0.8*h1≤h3≤1.5*h1. The structural parameters fully consider the forging process of the flywheel rotor 3, and the heat treatment is more uniform, which ensures the consistency of the strength of the material everywhere, avoids accidents in future use, and improves the safety and reliability of the flywheel energy storage product.

[0033] The driving motor 6 is arranged below the housing 1 and drives the lower connecting shaft 5 to rotate. The driving motor 6 in this embodiment includes a motor stator 6a, a motor rotor 6b, and an armature winding 6c.

[0034] The motor rotor 6b is sleeved on the lower connecting shaft 5 and can drive the lower connecting shaft 5 to rotate. The motor stator 6a is sleeved outside the motor rotor 6b, and the armature winding 6c is arranged on the motor stator 6a. The armature winding 6c can be a ring-shaped winding arranged on the motor stator 6a with grooves on the inner and outer sides, or can be a lap winding arranged in the inner groove.

[0035] In order to fix the motor stator 6a, the fixing seat 6d is further arranged in this embodiment, and the fixing seat 6d is fixed on the lower end cover 3. Specifically, the fixing seat 6d in this embodiment is sleeve-shaped, and the fixing seat 6d is sleeved on the outer wall of the motor stator 6a. The fixing seat 6d in this embodiment is further provided with an annular cooling channel 6d1, which can realize the cooling function through cooling liquid or ventilation.

[0036] This embodiment is also provided with a magnetic ring 10, which is fixed on the upper end cover 2. Specifically, the magnetic ring 10 includes a permanent magnet ring 10a and a ferromagnetic ring 10b. The permanent magnet ring 10a in this embodiment can be made of ferrite or neodymium iron boron. The ferromagnetic ring 10b is sleeved on the inner wall and the outer wall of the permanent magnet ring 10a. The permanent magnet ring 10a and the upper end surface of the flywheel rotor 3 form an air gap one, and the side wall of the flywheel rotor 3 and the inner wall of the housing 1 form an air gap two. The distance of the air gap one is L1, and the distance of the air gap two is L2, and L2≥5*L1.

[0037] As shown in the principle, Figure 2 The magnetization direction of the permanent magnet ring 10a is axial magnetization. A magnetic circuit is formed by the permanent magnet ring 10a, the air gap one, the H-shaped flywheel rotor 3, the air gap one, the ferromagnetic ring 10b, and the upper end cover 2, which generates an upward suspension force, thereby unloading the mass of the flywheel rotor 3 and reducing the weight borne by the mechanical bearing, thereby reducing the bearing loss.

[0038] Embodiment 2

[0039] As shown in the principle, Figure 3 The embodiment is basically the same as embodiment 1, except that the driving motor 6 in this embodiment is located above the housing 1 and drives the upper connecting shaft 4 to rotate.

[0040] The upper bearing 8a is replaced by a bearing seat 9 in the embodiment, and the top end of the upper connecting shaft 4 is inserted into the bearing seat 9, and the bearing seat 9 is fixed with the fixed seat 6d.

[0041] The embodiment is further provided with a magnetic isolation ring 7. The magnetic isolation ring 7 is fixed on the upper end cover 2, and the fixed seat 6d is fixed on the magnetic isolation ring 7. In other embodiments, the driving motor 6, the bearing seat 9 and the magnetic isolation ring 7 in the embodiment can also be arranged below the shell 1.

[0042] In addition, the magnetic ring 10 in the embodiment includes a permanent magnetic ring 10a and a ferromagnetic ring 10b, and the ferromagnetic ring 10b presses the permanent magnetic ring 10a on the upper end cover 2 through bolts.

[0043] In the embodiment, the magnetic isolation ring 7, the lower connecting shaft 5 and the bearing seat 9 are non-ferromagnetic materials, and preferably are stainless steel.

[0044] As shown in the principle, Figure 4 The permanent magnetic ring 10a is magnetized in the axial direction, a magnetic circuit is formed through the permanent magnetic ring 10a, the ferromagnetic ring 10b, the air gap one, the H-shaped flywheel rotor 3, the air gap two, the shell 1 and the upper end cover 2, an upward suspension force is generated, thereby unloading the mass of the flywheel rotor 3, reducing the weight borne by the mechanical bearing and reducing the bearing loss.

[0045] It should be noted that the upper, lower and other directions described in the embodiment are all referred to the drawings of the specification, and are only used for describing the technical solutions, but do not represent the limitation of the protection scope.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and do not limit the protection scope of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A flywheel energy storage system of wheel-in-wheel hub monobloc forging, characterized in that, The flywheel includes a shell, an upper end cover, a lower end cover, a flywheel rotor, an upper connecting shaft, a lower connecting shaft, a driving motor and a magnetic ring. The shell is sleeve-shaped, and the upper end cover and the lower end cover are respectively arranged at the upper end and the lower end of the shell. The flywheel rotor is arranged in the shell, and the longitudinal section of the flywheel rotor is H-shaped. The shell, the upper end cover and the flywheel rotor are made of magnetic material. The bottom end of the upper connecting shaft is fixed to the top surface of the thin disc at the center of the flywheel rotor, and the top end of the upper connecting shaft is connected to the bearing of the upper end cover. The top end of the lower connecting shaft is fixed to the bottom surface of the thin disc at the center of the flywheel rotor, and the bottom end of the lower connecting shaft is connected to the bearing of the lower end cover. The driving motor is arranged in the shell, and the driving motor drives the upper connecting shaft or the lower connecting shaft to rotate.

2. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The magnetic ring is fixed to the bottom surface of the upper end cover. The driving motor includes a motor stator, a motor rotor and an armature winding.

3. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The motor rotor is sleeved on the upper connecting shaft or the lower connecting shaft and can drive the upper connecting shaft or the lower connecting shaft to rotate.

4. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 3, wherein, The motor stator is sleeved outside the motor rotor, and the armature winding is arranged on the motor stator.

5. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 3, wherein, The fixing seat is sleeve-shaped and is fixed to the upper end cover or the lower end cover.

6. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The bearing seat is fixed to the fixing seat, and the upper connecting shaft or the lower connecting shaft of the driving motor is inserted into the bearing seat.

7. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 6, wherein, The magnetic ring is fixed to the upper end cover or the lower end cover, and the fixing seat is fixed to the magnetic ring.

8. A wheel-and-ring hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The upper connecting end is arranged on the top surface of the thin disc at the center of the flywheel rotor, and the lower connecting end is arranged on the bottom surface of the thin disc.

9. A wheel-and-ring hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The thickness of the outer wall of the flywheel rotor is h, the thickness of the thin disc is h1, the thickness of the upper connecting end is h2, and the thickness of the lower connecting end is h3.

10. A wheel-ring-hub-integrally-forged flywheel energy storage system according to claim 1, wherein, The magnetic ring includes a permanent magnetic ring and a ferromagnetic ring. The ferromagnetic ring is sleeved on the inner wall and the outer wall of the permanent magnetic ring. The distance between the magnetic ring and the upper end surface of the flywheel rotor is L1, and the distance between the outer wall of the flywheel rotor and the inner wall of the shell is L2. The distance L2 is greater than 5*L1.

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