CN217977209U

CN217977209U - Multi-bearing sectional type flywheel energy storage device

Info

Publication number: CN217977209U
Application number: CN202222054355.1U
Authority: CN
Inventors: 张志来; 戴兴建; 胡东旭; 张华良; 陈海生; 徐玉杰; 徐鲍; 王继平
Original assignee: Zhongke Nanjing Future Energy System Research Institute; Institute of Engineering Thermophysics of CAS
Current assignee: Zhongke Nanjing Future Energy System Research Institute; Institute of Engineering Thermophysics of CAS
Priority date: 2022-08-05
Filing date: 2022-08-05
Publication date: 2022-12-06
Anticipated expiration: 2032-08-05

Abstract

The utility model discloses a multi-bearing sectional type flywheel energy storage device, which comprises an upper bearing, a lower bearing, a middle bearing, a shell, a rotating shaft, a first flywheel and a second flywheel; the two flywheels are arranged on the rotating shaft, the shell is arranged outside the flywheels and the rotating shaft, the upper bearing and the lower bearing are arranged at two ends of the rotating shaft, the middle bearing is arranged on the rotating shaft between the two flywheels, and the middle bearing is arranged between the shell and the rotating shaft. The first flywheel and the rotating shaft are integrally formed, and the second flywheel and the rotating shaft are detachably connected. The utility model discloses be used for solving and lead to the too big problem of radial vibration that first-order critical speed crossed low and cause because of flywheel axial span is big. The flywheel body with large thickness is divided into two parts, which is beneficial to the uniformity of the heat treatment of the flywheel body. The radial strength of the rotating shaft of the flywheel body is improved by additionally installing the bearing between the two flywheel bodies. In order to facilitate the bearing installation of the middle position of the flywheel, the sectional flywheel rotating shaft and the shell design matched with the sectional flywheel rotating shaft are designed.

Description

Multi-bearing sectional type flywheel energy storage device

Technical Field

The utility model relates to an energy storage technical field, especially a multi-bearing sectional type flywheel energy memory.

Background

At present, a flywheel energy storage system is successfully applied to the fields of uninterruptible power supplies, renewable energy photovoltaic power generation, peak shaving of wind power generation, hybrid electric vehicles and the like. The flywheel energy storage system consists of a flywheel energy storage device and an electric control system, a flywheel rotating shaft in the flywheel energy storage device runs at a high speed, and energy storage is realized in a mechanical energy mode; the electric control system is responsible for energy conversion between electric energy and mechanical energy and monitoring and controlling the flywheel energy storage device.

The flywheel body is used as a main energy storage device of a flywheel energy storage system, is generally made of metal materials or composite materials, and the centrifugal stress is limited by the strength of the materials according to a calculation formula of the centrifugal stress of the rotating body, so that the maximum safe diameter of the flywheel body is determined under the condition of certain rotating speed and materials. To obtain more stored energy, the flywheel mass needs to be thickened axially. The greater the thickness of the flywheel mass, the greater the axial span of the entire flywheel shaft. The lower the critical rotating speed of the flywheel rotating shaft is, the larger the bending deformation is, and the rotating shaft is easy to be unstable in the running process.

At present, a bearing commonly used for a flywheel energy storage rotating shaft is a mechanical bearing or an electromagnetic bearing. The bearings are generally two radial bearings and an axial bearing, the radial bearings are generally distributed on the upper side and the lower side of the rotating shaft, the flywheel body, the motor and the like are arranged between the two bearings, and the axial bearing is generally arranged at the top of the rotating shaft. The metal flywheel body and the rotating shaft are designed into a whole, and the composite flywheel body is sleeved on the metal hub in a nested and interference manner. The flywheel shaft is generally short due to the limitation of the bearing span, or the diameter of the shaft is thickened to meet the requirement of radial rigidity.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, and provide the utility model provides a radial bearing distribution mode to large-span flywheel pivot to be used for solving because of the large radial vibration too big problem that leads to that one-order critical speed crosses low and cause of flywheel axial span. The flywheel body with large thickness is divided into two parts, which is beneficial to the uniformity of the heat treatment of the flywheel body. The radial strength of the rotating shaft of the flywheel body is improved by additionally installing a bearing between the two flywheel bodies. In order to facilitate the installation of the bearing at the middle position of the flywheel, a sectional flywheel rotating shaft and a shell design mode matched with the sectional flywheel rotating shaft are designed.

In order to solve the technical problem, the utility model adopts the technical scheme that:

a multi-bearing sectional type flywheel energy storage device comprises an upper bearing, a lower bearing, a middle bearing, a shell, a rotating shaft, a first flywheel and a second flywheel; the two flywheels are arranged on the rotating shaft, the shell is arranged outside the flywheels and the rotating shaft, the upper bearing and the lower bearing are arranged at two ends of the rotating shaft, the middle bearing is arranged on the rotating shaft between the two flywheels, and the middle bearing is arranged between the shell and the rotating shaft.

As the utility model discloses a further preferred, first flywheel and pivot integrated into one piece, the second flywheel is connected for dismantling with the connected mode of pivot.

As a further preference of the present invention, the rotating shaft between the first flywheel and the second flywheel are both provided with corresponding tooth-like structures, the tooth-like structures include convex teeth and concave teeth, and the convex teeth of one tooth-like structure are inserted into the concave teeth of the other tooth-like structure; the second flywheel is connected with the rotating shaft in a gear shaping mode.

As a further preference of the present invention, the tooth width ratio of the convex teeth and the concave teeth is 1:1.

as a further preferred aspect of the present invention, the upper bearing and the lower bearing are electromagnetic bearings or mechanical bearings, and the intermediate bearing is a mechanical bearing.

As the utility model discloses a further preferred, when upper bearing and lower bearing adopt electromagnetic bearing and middle bearing to adopt mechanical bearing, the clearance between electromagnetic bearing and the pivot is an, and the clearance between mechanical bearing and the pivot is b, and a > b.

As a further preferred, the utility model discloses a still include the motor, the motor is connected with the pivot, and the drive pivot rotates.

As a further preferred aspect of the present invention, the magnetic bearing further includes an axial load bearing magnetic bearing, and the axial load bearing magnetic bearing is disposed between the housing and the rotating shaft.

As a further preference of the present invention, the housing includes a base housing, a middle housing and an upper housing; a lower bearing and a motor are arranged in the base shell; the middle shell wraps the first flywheel, the second flywheel and the middle bearing; an upper bearing and an axial force bearing magnetic bearing are arranged in the upper shell.

As the utility model discloses a further preferred, the intermediate shaft holds the intermediate position of setting in the pivot, and the radial mode that adopts the strengthening rib of bearing mounted position.

The utility model discloses following beneficial effect has:

1. compare in other way that only designs radial bearing in two upper and lower positions of flywheel pivot, the utility model discloses at the additional radial bearing of intermediate position. The three-bearing arrangement allows the shaft to have a longer axial length than when supported by two bearings. The critical rotating speed of the rotating shaft can be improved under the condition that the diameter of the rotating shaft does not need to be increased, and the bending deformation of the rotating shaft due to the critical rotating speed is avoided.

2. The upper and lower magnetic bearings and the middle mechanical bearing are adopted, so that extra radial force can be provided when the rotating shaft passes through the critical rotating speed, and the instability of the rotating shaft or the collision and friction between the rotating shaft and the shell caused by excessive deformation can be avoided.

3. The rotating shaft can be ensured to safely and stably transit the critical rotating speed area.

4. The flywheel body with large thickness is divided into two parts, which is beneficial to the uniformity of the heat treatment of the flywheel body. The radial strength of the rotating shaft of the flywheel body is improved by additionally installing the bearing between the two flywheel bodies. In order to facilitate the installation of the bearing at the middle position of the flywheel, a sectional flywheel rotating shaft and a shell design mode matched with the sectional flywheel rotating shaft are designed.

Drawings

FIG. 1 is an exploded view of the assembly of the present invention;

FIG. 2 is a schematic view of the present invention illustrating a gear shaping type engagement;

fig. 3 is a schematic view of the assembly structure of the present invention.

Among them are: 1. an upper bearing; 2. a middle bearing; 3. a lower bearing; 4. a first flywheel; 5. a second flywheel; 6. a rotating shaft; 7. an upper housing; 8. a middle housing; 9. a base housing; 10. an axial force bearing magnetic bearing; 11. a convex tooth; 12. concave teeth; 13. an electric motor.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.

In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second" and the like do not indicate the degree of importance of the component parts, and thus, are not to be construed as limiting the present invention. The specific dimensions used in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.

As shown in fig. 1-3, a multi-bearing segmented flywheel energy storage device includes an upper bearing 1, a lower bearing 3, a middle bearing 2, a housing, a rotating shaft 6, a first flywheel 4 and a second flywheel 5; the two flywheels are arranged on the rotating shaft 6, the shell is arranged outside the flywheels and the rotating shaft 6, the upper bearing 1 and the lower bearing 3 are arranged at two ends of the rotating shaft 6, the middle bearing is positioned on the rotating shaft 6 between the two flywheels, and the middle bearing is arranged between the shell and the rotating shaft 6. The middle bearing 2 is arranged in the middle of the rotating shaft 6, and the mounting position of the bearing adopts a mode of reinforcing ribs in the radial direction, so that the quality of the shell is reduced, and the strength is ensured to be unchanged.

The utility model discloses a main aim at provides a flywheel shafting bearing's arrangement mode to reduce the flywheel shaft and span too big and the flywheel flexible deformation that arouses to the influence of high-speed rotation, and based on this bearing arrangement mode, designed sectional type flywheel axis body structure and syllogic shell structure design.

The utility model provides a flywheel shafting journal bearing's design mode and with it complex sectional type flywheel axis body and casing design. Radial bearing compares in common upper and lower respectively settles a mechanical bearing or electromagnetic bearing, the utility model discloses the key additional mechanical bearing of settling in flywheel middle part position forms the arrangement structure of three bearings down in the top. The three bearings are more beneficial to the structural stability of the long-span shafting with double flywheels.

The first flywheel 4 and the rotating shaft 6 are integrally formed, and the second flywheel 5 and the rotating shaft 6 are detachably connected. The rotating shaft 6 between the first flywheel 4 and the second flywheel 5 are both provided with corresponding tooth-shaped structures, each tooth-shaped structure comprises a convex tooth 11 and a concave tooth 12, and the convex tooth 11 of one tooth-shaped structure is inserted into the concave tooth 12 of the other tooth-shaped structure; the second flywheel 5 is connected with the rotating shaft 6 in a gear shaping mode. The utility model provides a compound mode of two flywheel axles, two flywheel axles can increase the flywheel energy storage system when storing up energy, still are favorable to the homogeneity of 6 thermal treatments of metal rotating shaft, have improved the high-speed rotatory stability of the flywheel body. In order to ensure that the middle bearing can be arranged between the two flywheel bodies, the flywheel bodies are assembled in a sectional mode, namely the first flywheel 4 and the rotating shaft 6 are integrally manufactured, and the second flywheel 5 and the rotating shaft 6 are sleeved. Adopt gear shaping formula cooperation mode between the suit flywheel body and the pivot 6, the tooth width ratio of convex tooth 11 and concave tooth 12 is 1:1. this ensures good torque transmission and equivalent rotational strength.

The upper bearing 1 and the lower bearing 3 are electromagnetic bearings or mechanical bearings, and the middle bearing 2 is a mechanical bearing. The device also comprises a motor 13, wherein the motor 13 is connected with the rotating shaft 6 and drives the rotating shaft 6 to rotate. The middle bearing 2, the upper bearing 1 and the lower bearing 3 are all radial bearings, the axial bearing magnetic bearing 10 is an axial bearing, and the axial bearing magnetic bearing 10 is arranged between the rotating shaft 6 at the top end of the rotating shaft 6 and the upper shell 7. When the upper, middle and lower radial bearings are all designed by mechanical bearings, the inner ring of the bearing is tightly matched with the rotating shaft 6, and the outer ring of the bearing is matched with the flywheel shell. After the rotating shaft 6 rotates, the three radial bearings work simultaneously to provide radial supporting force for the large-span flywheel rotating shaft 6, the first-order critical rotating speed of the rotating shaft 6 is improved, the designed operating rotating speed of the rotating shaft 6 is guaranteed to be always at the critical rotating speed, and the rotating shaft 6 cannot be bent greatly flexibly.

When the upper bearing 1 and the lower bearing 3 employ electromagnetic bearings and the intermediate bearing 2 employs mechanical bearings, the gap between the electromagnetic bearings and the rotating shaft 6 is a, the gap between the mechanical bearings and the rotating shaft 6 is b, and a > b. When the rotating shaft 6 rotates at a low speed and the rotating shaft 6 is in a rigid state, only the upper and lower electromagnetic bearings provide radial supporting force. When the rotating speed of the rotating shaft 6 reaches the first-order critical rotating speed and is flexibly bent, the middle position of the rotating shaft 6 is bent to the maximum degree and is contacted with a pre-designed middle bearing, and the middle bearing provides a part of supporting force to ensure that the flywheel stably passes through a first-order critical rotating speed area. After the rotating shaft 6 is deformed and recovered, the middle bearing is separated from the working state.

The shell comprises a base shell 9, a middle shell 8 and an upper shell 7; the lower bearing 3 and the motor 13 are arranged in the base shell 9; the middle shell 8 wraps the first flywheel 4, the second flywheel 5 and the middle bearing 2; the upper bearing 1 and the axial force bearing magnetic bearing 10 are arranged in the upper shell 7. The intermediate bearing 2 is arranged in a radially inwardly recessed portion at the middle of the intermediate housing 8.

The mounting steps of the three-bearing segmented flywheel energy storage system are as follows: firstly, the lower bearing 3 and the motor 13 are arranged in a base shell 9, then the rotating shaft 6 is placed in the base shell 9 from top to bottom, and the first flywheel 4 which is integrally manufactured with the rotating shaft 6 is placed on the upper plane of the base; then the middle shell 8 penetrates through the rotating shaft 6 from top to bottom to cover the first flywheel 4 on the base; then the middle bearing 2 is fixedly arranged between the rotating shaft 6 and the middle shell 8; then the second flywheel body 5 passes through the rotating shaft 6 to be installed, the second flywheel body 5 and the integrated flywheel shaft realize gear shaping type matching, and then the second flywheel body and the integrated flywheel shaft are fastened by screws along the axial direction; and finally, the upper bearing 1 and the axial force bearing magnetic bearing 10 are arranged on the upper part of the rotating shaft 6 and in the upper shell 7, and the upper shell 7 is connected with the middle shell 8 from top to bottom.

When three mechanical bearings are adopted, the three radial bearings provide larger radial supporting force, a flywheel body with longer axial length can be designed, the critical rotating speed of the rotating shaft 6 is improved, and the rotating shaft 6 can safely operate at the rated rotating speed.

The above detailed description describes the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention to perform various equivalent transformations, which all belong to the protection scope of the present invention.

Claims

1. A multi-bearing segmented flywheel energy storage device is characterized in that: comprises an upper bearing (1), a lower bearing (3), a middle bearing (2), a shell, a rotating shaft (6), a first flywheel (4) and a second flywheel (5); the two flywheels are arranged on the rotating shaft (6), the shell is arranged outside the flywheels and the rotating shaft (6), the upper bearing (1) and the lower bearing (3) are arranged at two ends of the rotating shaft (6), the middle bearing is arranged on the rotating shaft (6) between the two flywheels, and the middle bearing is arranged between the shell and the rotating shaft (6).

2. The multi-bearing segmented flywheel energy storage device of claim 1, wherein: the first flywheel (4) and the rotating shaft (6) are integrally formed, and the second flywheel (5) and the rotating shaft (6) are detachably connected.

3. The multi-bearing segmented flywheel energy storage device of claim 2, wherein: corresponding tooth-shaped structures are arranged on a rotating shaft (6) between the first flywheel (4) and the second flywheel (5) and on the second flywheel (5), each tooth-shaped structure comprises a convex tooth (11) and a concave tooth (12), and the convex tooth (11) of one tooth-shaped structure is inserted into the concave tooth (12) of the other tooth-shaped structure; the second flywheel (5) is connected with the rotating shaft (6) in a gear shaping manner.

4. The multi-bearing segmented flywheel energy storage device of claim 3, wherein: the tooth width ratio of the convex teeth (11) to the concave teeth (12) is 1:1.

5. the multi-bearing segmented flywheel energy storage device of claim 1, wherein: the upper bearing (1) and the lower bearing (3) are electromagnetic bearings or mechanical bearings, and the middle bearing (2) is a mechanical bearing.

6. The multi-bearing segmented flywheel energy storage device of claim 5, wherein: when the upper bearing (1) and the lower bearing (3) adopt electromagnetic bearings and the middle bearing (2) adopts a mechanical bearing, the clearance between the electromagnetic bearings and the rotating shaft (6) is a, the clearance between the mechanical bearings and the rotating shaft (6) is b, and a > b.

7. The multi-bearing segmented flywheel energy storage device of claim 1, wherein: the device also comprises a motor (13), wherein the motor (13) is connected with the rotating shaft (6) and drives the rotating shaft (6) to rotate.

8. The multi-bearing segmented flywheel energy storage device of claim 7, wherein: the bearing device also comprises an axial bearing magnetic bearing (10), and the axial bearing magnetic bearing (10) is arranged between the shell and the rotating shaft (6).

9. The multi-bearing segmented flywheel energy storage device of claim 8, wherein: the shell comprises a base shell (9), a middle shell (8) and an upper shell (7); a lower bearing (3) and a motor (13) are arranged in the base shell (9); the middle shell (8) wraps the first flywheel (4), the second flywheel (5) and the middle bearing (2); an upper bearing (1) and an axial force bearing magnetic bearing (10) are arranged in the upper shell (7).

10. The multi-bearing segmented flywheel energy storage device of claim 1, wherein: the middle bearing (2) is arranged in the middle of the rotating shaft (6), and the mounting position of the bearing adopts a mode of reinforcing ribs in the radial direction.