Large-inertia energy storage flywheel rotor and use method thereof

Abstract

The invention provides a large-inertia energy storage flywheel rotor and a using method thereof, and belongs to the technical field of flywheel energy storage. One end of the flywheel is connected with one end of the motor shaft, the end, away from the motor shaft, of the flywheel is connected with an upper shaft head, the end, away from the flywheel, of the motor shaft is connected with a lower shaft head, and the motor shaft is sleeved with a motor rotor. The flywheel and the motor shaft are in a split type, are connected in an interference mode after being respectively processed, and then are fastened by high-strength bolts, so that the processing cost can be reduced, and the situation that the energy storage capacity is reduced or the service life is shortened due to the fact that the size and the mass are large and the processing precision cannot be guaranteed is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of flywheel energy storage equipment, in particular to a large inertia energy storage flywheel rotor. Background Art

[0002] Flywheel energy storage equipment is widely used in industrial production and life as a new type of environmentally friendly energy storage and frequency modulation equipment due to its advantages such as high power density, long life and rapid response. As a power carrier, the flywheel assembly is the core component of the flywheel energy storage equipment. With the increase of stored energy, in order to better store energy, the volume and mass of the flywheel monomer also need to increase. With the increase of the volume and mass of the flywheel, the structural strength, rotation mode and stability of the entire energy storage equipment during use will also change. In particular, the overall structure and manufacturing process of the flywheel rotor will also face greater challenges and uncertainties.

[0003] Therefore, there is an urgent need for a flywheel rotor structure suitable for large inertia energy storage to meet the use of large inertia energy storage equipment. Summary of the invention

[0004] In view of this, the present invention reduces the difficulty of processing the flywheel and the motor shaft, increases the volume and mass of the flywheel, and improves the processing accuracy of the flywheel and the motor shaft by separately arranging the flywheel and the motor shaft.

[0005] The technical solution of the present invention is implemented as follows: a large inertia energy storage flywheel rotor comprises a flywheel and a motor shaft, one end of the flywheel is connected to one end of the motor shaft, an upper shaft head is connected to the end of the flywheel away from the motor shaft, a lower shaft head is connected to the end of the motor shaft away from the flywheel, and a motor rotor is sleeved on the motor shaft.

[0006] On the basis of the above technical solution, preferably, an upper rotor radial magnetic bearing is sleeved on the flywheel, and a lower rotor radial magnetic bearing is sleeved on the motor shaft.

[0007] On the basis of the above technical solution, preferably, a flywheel connecting shaft is provided at one end of the flywheel away from the motor shaft, a first connecting hole is provided at the end of the flywheel connecting shaft, and one end of the upper shaft head is fixedly arranged in the first connecting hole.

[0008] On the basis of the above technical solution, preferably, an upper liner ring is sleeved on one end of the upper shaft head extending out of the first connecting hole.

[0009] On the basis of the above technical solution, preferably, a thrust plate and an upper rotor sensor are also sleeved on the flywheel connecting shaft, the thrust plate is fixedly arranged at the end where the flywheel connecting shaft is connected to the upper shaft head, and the upper rotor sensor is arranged close to the upper rotor radial magnetic bearing.

[0010] On the basis of the above technical solution, preferably, a flywheel mounting seat is provided at one end of the flywheel away from the upper shaft head, a second connecting hole is provided on the flywheel mounting seat, and one end of the motor shaft is fixedly arranged in the second connecting hole.

[0011] Based on the above technical solution, preferably, a motor sleeve, a lower rotor radial magnetic bearing and a lower rotor sensor are sleeved on the motor shaft, the motor sleeve is arranged close to the motor rotor, the lower rotor radial magnetic bearing is arranged close to the motor sleeve, and the lower rotor sensor is arranged close to the lower rotor radial magnetic bearing.

[0012] On the basis of the above technical solution, preferably, a third fixing hole is provided at the end of the motor shaft away from the flywheel, one end of the lower shaft head is fixed in the third fixing hole, and one end of the lower shaft head extending out of the third fixing hole is sleeved with a lower inner lining ring.

[0013] On the basis of the above technical solution, preferably, the end of the motor shaft where the third fixing hole is provided is sleeved with a lower balancing plate.

[0014] On the basis of the above technical solution, preferably, the flywheel is provided with a first dovetail groove and a second dovetail groove, the first dovetail groove is provided on one side of the flywheel, and the second dovetail groove is provided on the other side of the flywheel.

[0015] A method for using a large inertia energy storage flywheel rotor comprises the following steps: S1: There is an interference fit between the flywheel and the motor shaft; put the motor shaft into liquid nitrogen for at least 1 hour, take out the cooled motor shaft, assemble the flywheel and the motor shaft together, and fix and lock the flywheel and the motor shaft with bolts; S2: After returning to room temperature, the motor rotor is heated and installed on the motor shaft, and an interference fit is adopted between the motor rotor and the motor shaft; S3: After cooling, the motor sleeve is heat-fitted onto the motor shaft, and an interference fit is adopted between the motor sleeve and the motor shaft; S4. After the lower rotor radial magnetic bearing and the lower rotor sensor are added, they are heat-fitted onto the motor shaft in sequence, and an interference fit is adopted between the rotor radial magnetic bearing and the lower rotor sensor and the motor shaft; S5. Assemble the lower balancing plate onto the motor shaft and tighten it with bolts. The lower balancing plate and the motor shaft are fitted with a gap, and the end face of the lower balancing plate is pressed onto the end face of the lower rotor sensor. S6. Cold-fit the lower shaft head into the third fixing hole, with an interference fit between the lower shaft head and the third fixing hole; S7. Install the lower liner ring onto the lower shaft head, and adopt an interference fit setting between the lower liner ring and the lower shaft head; S8. The upper rotor radial magnetic bearing and the upper rotor sensor are sequentially heat-fitted onto the flywheel connecting shaft, and an interference fit is adopted between the upper rotor radial magnetic bearing and the upper rotor sensor and the flywheel connecting shaft; S9. The thrust plate is assembled to the flywheel connecting shaft, and the thrust plate is locked on the flywheel connecting shaft by bolts, and a clearance fit is adopted between the thrust plate and the flywheel connecting shaft; S10. The upper shaft head is cold-installed into the first connecting hole, and an interference fit is adopted between the upper shaft head and the first connecting hole; the upper liner ring is heat-installed onto the upper shaft head, and an interference fit is adopted between the upper liner ring and the upper shaft head.

[0016] The large inertia energy storage flywheel rotor and the use method thereof of the present invention have the following beneficial effects compared with the prior art: The flywheel and the motor shaft are separate types. After being processed separately, they are connected by interference fit and then fastened with high-strength bolts. This can reduce processing costs and avoid the inability to ensure processing accuracy due to large volume and mass, which leads to failure to meet requirements during use, resulting in reduced energy storage capacity or reduced service life; the end of the flywheel away from the motor shaft is connected to an upper shaft head, and the end of the motor shaft away from the flywheel is connected to a lower shaft head, wherein the upper shaft head and the flywheel are separate types. When the upper shaft head is damaged due to wear or bending during use, it can be replaced, reducing maintenance costs. The motor shaft and the lower shaft head are separate types. When the lower shaft head is damaged due to wear or bending during use, it can be replaced, reducing maintenance costs; the motor rotor is installed on the motor shaft and cooperates with the motor stator installed in the whole machine, and is the source of rotational power. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A cross-sectional view of a large inertia energy storage flywheel rotor of the present invention; Figure 2 A top view of the thrust plate of the present invention; Figure 3 It is the flywheel of the present invention. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] like Figure 1-3 As shown, a large inertia energy storage flywheel rotor includes a flywheel 1 and a motor shaft 2, one end of the flywheel 1 is connected to one end of the motor shaft 2, the end of the flywheel 1 away from the motor shaft 2 is connected to an upper shaft head 3, the end of the motor shaft 2 away from the flywheel 1 is connected to a lower shaft head 4, and the motor shaft 2 is sleeved with a motor rotor 6. The flywheel 1 and the motor shaft are two separate parts. After being processed separately, they are connected by interference fit and then fastened with high-strength bolts. This can reduce processing costs and avoid the inability to ensure processing accuracy due to large volume and mass, which leads to failure to meet requirements during use, resulting in reduced energy storage capacity or reduced service life; the end of the flywheel 1 away from the motor shaft 2 is connected to an upper shaft head 3, and the end of the motor shaft 2 away from the flywheel 1 is connected to a lower shaft head 4, wherein the upper shaft head 3 and the flywheel 1 are separate parts. When the upper shaft head 3 is damaged due to wear or bending during use, it can be replaced, reducing maintenance costs. The motor shaft 2 and the lower shaft head 4 are separate parts. When the lower shaft head 4 is damaged due to wear or bending during use, it can be replaced, reducing maintenance costs; the motor rotor 6 is installed on the motor shaft 2, and cooperates with the motor stator installed in the whole machine, and is the source of rotational power.

[0021] The flywheel 1 is sleeved with an upper rotor radial magnetic bearing 51, and the motor shaft 2 is sleeved with a lower rotor radial magnetic bearing 52. The upper rotor radial magnetic bearing 51 and the lower rotor radial magnetic bearing 52 are mainly used as carriers for the adsorption of axial magnetic bearings, and threaded holes are evenly distributed around them. The dynamic balance of the flywheel 1 can be adjusted by screwing in set screws, so that the entire device is more stable during the rotation process, and the energy storage capacity and reliability are improved.

[0022] The flywheel 1 is provided with a flywheel connecting shaft 11 at one end away from the motor shaft 2, and a first connecting hole 12 is provided at the end of the flywheel connecting shaft 11. One end of the upper shaft head 3 is fixedly arranged in the first connecting hole 12. The upper shaft head 3 and the first connecting hole 12 are interference fit, and screws are usually used to tighten them for a more secure connection.

[0023] One end of the upper shaft head 3 extending out of the first connecting hole 12 is sleeved with an upper inner liner ring 31, and the upper inner liner ring 31 is used to improve the wear resistance of the upper shaft head 3. The upper inner liner ring 31 is usually made of a high-hardness alloy and is mainly in contact with the upper protective bearing. It has strong wear resistance. When the flywheel 1 becomes unstable, the upper shaft head 3 can be effectively protected. Only the upper inner liner ring 31 needs to be replaced, which saves costs.

[0024] The flywheel connecting shaft 11 is also sleeved with a thrust plate 71 and an upper rotor sensor 73. The thrust plate 71 is fixedly arranged at the end where the flywheel connecting shaft 11 is connected to the upper shaft head 3, and the upper rotor sensor 73 is arranged close to the upper rotor radial magnetic bearing 51. The thrust plate 71 is clearance-matched with the flywheel connecting shaft 11, which is convenient for disassembly and maintenance. It has the function of adjusting the balance with the flywheel 1. When adjusting the dynamic balance, the whole assembly can be adjusted after it is completed, and there is no need to disassemble it again. It is only necessary to screw in a suitable set screw in the thrust plate 71 according to the dynamic balance result to change the overall dynamic balance; the upper rotor sensor 73 is used to detect the balance position and balance state of the flywheel 1. The upper rotor sensor 73 is mainly assembled by stacking silicon steel sheets, and is used to cooperate with the upper displacement sensor installed in the whole machine to detect the position of the upper half.

[0025] A flywheel mounting seat 13 is disposed at one end of the flywheel 1 away from the upper shaft head 3 . A second connecting hole 14 is disposed on the flywheel mounting seat 13 . One end of the motor shaft 2 is fixedly disposed in the second connecting hole 14 .

[0026] The motor shaft 2 is sleeved with a motor sleeve 21, a lower rotor radial magnetic bearing 52 and a lower rotor sensor 74. The motor sleeve 21 is arranged close to the motor rotor 6, the lower rotor radial magnetic bearing 52 is arranged close to the motor sleeve 21, and the lower rotor sensor 74 is arranged close to the lower rotor radial magnetic bearing 52. The lower rotor sensor 74 is used to detect the position of the motor shaft 2, which is convenient for adjusting the overall dynamic balance filling; the motor sleeve 21 is installed on the motor shaft 2, and the length can be adjusted through processing, which mainly plays the role of pressing the motor rotor 6 and adjusting the axial position of the lower half of the assembly; the lower rotor radial magnetic bearing 52 is mainly assembled by stacking silicon steel sheets, which is used to cooperate with the lower radial magnetic bearing 52 installed in the whole machine, and plays the role of being adsorbed by the magnetic bearing.

[0027] The end of the motor shaft 2 away from the flywheel 1 is provided with a third fixing hole 22, one end of the lower shaft head 4 is fixedly arranged in the third fixing hole 22, and one end of the lower shaft head 4 extending out of the third fixing hole 22 is sleeved with a lower liner ring 41. The lower liner ring 41 is installed on the lower shaft head 4, and is made of a high-hardness alloy. It is mainly in contact with the lower protective bearing and has strong wear resistance. When the flywheel 1 is unstable, the lower shaft head 4 can be effectively protected. Only the lower liner ring 41 needs to be replaced, which saves costs; the lower shaft head 4 is used to install the lower liner ring 41 and some other parts of the whole machine.

[0028] Axial magnetic bearings are installed on the upper and lower sides of the thrust plate 71, which are mainly used as carriers for the adsorption of the axial magnetic bearings. Threaded holes are evenly distributed around the circumference, and the dynamic balance can be adjusted by screwing in set screws.

[0029] The end of the motor shaft 2 provided with the third fixing hole 22 is sleeved with a lower balancing plate 72. The lower balancing plate 72 is installed on the motor shaft 2. Without this part, due to the existence of the upper thrust plate 71, the whole system is unstable during rotation, and it is easy to swing and vortex, which damages the flywheel 1. The lower balancing plate 72 can also press the lower rotor sensor 74 to prevent the lower rotor sensor 74 from axial movement, which affects the detection effect.

[0030] The flywheel 1 is provided with a first dovetail groove 15 and a second dovetail groove 16, wherein the first dovetail groove 15 is provided on one side of the flywheel 1, and the second dovetail groove 16 is provided on the other side of the flywheel 1. The first dovetail groove 15 and the second dovetail groove 16 are both closed rings, and the ring surrounded by the first dovetail groove 15 and the second dovetail groove 16 and the center of the flywheel 1 are in a straight line, and customized counterweights are installed in the first dovetail groove 15 and the second dovetail groove 16 to adjust the overall dynamic balance of the flywheel 1 so that the flywheel 1 remains in a steady state during use.

[0031] The upper rotor radial magnetic bearing 51 is mainly assembled by stacking silicon steel sheets and is used in conjunction with the upper radial magnetic bearing installed in the whole machine to be adsorbed by the magnetic bearing; the flywheel 1 is the main energy carrier and is composed of high-strength alloy steel with a yield strength of more than 1000 MPa. By designing different sizes, different energy storage capacities can be matched.

[0032] A method for using a large inertia energy storage flywheel rotor comprises the following steps: S1: There is an interference fit between the flywheel 1 and the motor shaft 2, and the interference is 0.12-0.2mm. Since the volume and mass of the flywheel 1 are relatively large, it is not easy to heat, and high temperature can easily destroy the material properties of the alloy steel, so a cold installation method is adopted; the mounting surface of the motor shaft 2 is placed in liquid nitrogen, kept for 1.5 hours, the liquid nitrogen-cooled motor shaft 2 is taken out and assembled with the flywheel 1, and then the two are fixed and locked at the lead position with high-strength bolts; S2: After returning to room temperature, heat the motor rotor 6 to 180° C., keep warm for 2.5 hours, and heat-fit the motor rotor 6 onto the motor shaft 2, with the interference set to 0.18 mm; S3: After cooling, measure the dimensions of the motor shaft 2, and repair the length of the motor shaft sleeve 21 according to the measured dimensions. After the repair is completed, the motor shaft sleeve 21 is processed to 240°C, kept warm for 1.5 hours, and hot-fitted onto the motor shaft 2 with an interference of 0.225mm. After cooling, the motor shaft sleeve 21 can ensure the axial stability of the motor rotor and prevent axial movement; S4. Heat the lower rotor radial magnetic bearing 52 and the lower rotor sensor 74 to 180°C, keep warm for 1H, and then heat-fit them onto the motor shaft 2 in sequence, with the interference set to 0.18mm; S5. Assemble the lower balancing plate 72 onto the motor shaft 2, tighten it with bolts, use a clearance fit, a unilateral clearance of 0.055 mm, and press the end face of the lower balancing plate 72 onto the end face of the lower rotor sensor 74 to prevent the lower rotor sensor 74 from axial movement on the motor shaft 1; S6. Place the lower shaft head 4 in liquid nitrogen for 0.5H, and cold-fit it into the third fixing hole 22 with an interference of 0.225mm; S7. Heat the lower liner ring 41 to 150°C, keep it warm for 0.5h, and heat-fit it to the lower shaft head 4 with an interference of 0.35mm; S8. Flip the assembly with the motor shaft 2 side facing downward; heat the upper rotor radial magnetic bearing 51 and the upper rotor sensor 73 to 180°C, keep warm for 1H, and heat-fit them onto the flywheel connecting shaft 11 in sequence, with the interference set to 0.18mm; S9. Assemble the thrust plate 71 to the flywheel connecting shaft 11 and tighten with bolts. The thrust plate 71 and the flywheel connecting shaft 11 are fitted with a clearance, and the unilateral clearance is 0.055mm; S10. Place the upper shaft head 3 in liquid nitrogen for 0.5 hours, and cold-install it into the first connecting hole 12 with an interference fit of 0.225 mm; heat the upper liner ring 31 to 150°C, keep it warm for 0.5 hours, and hot-install it onto the upper shaft head 3 with an interference fit of 0.35 mm between the upper liner ring 31 and the upper shaft head 3.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A large inertia energy storage flywheel rotor, comprising a flywheel (1) and a motor shaft (2), wherein one end of the flywheel (1) is connected to one end of the motor shaft (2), and characterized in that: An end of the flywheel (1) away from the motor shaft (2) is connected to an upper shaft head (3), an end of the motor shaft (2) away from the flywheel (1) is connected to a lower shaft head (4), and a motor rotor (6) is sleeved on the motor shaft (2).

2. A large inertia energy storage flywheel rotor as claimed in claim 1, characterized in that: An upper rotor radial magnetic bearing (51) is sleeved on the flywheel (1), and a lower rotor radial magnetic bearing (52) is sleeved on the motor shaft (2).

3. A large inertia energy storage flywheel rotor as claimed in claim 2, characterized in that: A flywheel connecting shaft (11) is provided at one end of the flywheel (1) away from the motor shaft (2), a first connecting hole (12) is provided at the end of the flywheel connecting shaft (11), and one end of the upper shaft head (3) is fixedly disposed in the first connecting hole (12).

4. A large inertia energy storage flywheel rotor as claimed in claim 3, characterized in that: An upper liner ring (31) is sleeved on one end of the upper shaft head (3) extending out of the first connecting hole (12).

5. A large inertia energy storage flywheel rotor as claimed in claim 3, characterized in that: The flywheel connecting shaft (11) is also sleeved with a thrust plate (71) and an upper rotor sensor (73); the thrust plate (71) is fixedly arranged at the end where the flywheel connecting shaft (11) is connected to the upper shaft head (3); and the upper rotor sensor (73) is arranged close to the upper rotor radial magnetic bearing (51).

6. A large inertia energy storage flywheel rotor as claimed in claim 3, characterized in that: A flywheel mounting seat (13) is provided at one end of the flywheel (1) away from the upper shaft head (3); a second connecting hole (14) is provided on the flywheel mounting seat (13); and one end of the motor shaft (2) is fixedly disposed in the second connecting hole (14).

7. A large inertia energy storage flywheel rotor as claimed in claim 1, characterized in that: A motor shaft sleeve (21), a lower rotor radial magnetic bearing (52) and a lower rotor sensor (74) are sleeved on the motor shaft (2); the motor shaft sleeve (21) is arranged close to the motor rotor (6); the lower rotor radial magnetic bearing (52) is arranged close to the motor shaft sleeve (21); and the lower rotor sensor (74) is arranged close to the lower rotor radial magnetic bearing (52).

8. A large inertia energy storage flywheel rotor as claimed in claim 1, characterized in that: A third fixing hole (22) is provided at the end of the motor shaft (2) away from the flywheel (1); one end of the lower shaft head (4) is fixedly arranged in the third fixing hole (22); and one end of the lower shaft head (4) extending out of the third fixing hole (22) is sleeved with a lower liner ring (41).

9. A large inertia energy storage flywheel rotor as claimed in claim 8, characterized in that: The end of the motor shaft (2) provided with the third fixing hole (22) is sleeved with a lower balancing plate (72).

10. A method for using a large inertia energy storage flywheel rotor, comprising the large inertia energy storage flywheel rotor according to claim 9, characterized in that: The following steps are involved: S1: There is an interference fit between the flywheel 1 and the motor shaft 2; put the motor shaft 2 into liquid nitrogen for at least 1 hour, take out the cooled motor shaft 2, assemble the flywheel 1 and the motor shaft 2 together, and fix and lock the flywheel 1 and the motor shaft 2 with bolts; S2: After returning to room temperature, the motor rotor 6 is heated and installed on the motor shaft 2, and an interference fit is adopted between the motor rotor 6 and the motor shaft 2; S3: After cooling, the motor sleeve 21 is heat-fitted onto the motor shaft 2, and an interference fit is adopted between the motor sleeve 21 and the motor shaft 2; S4. After the lower rotor radial magnetic bearing 52 and the lower rotor sensor 74 are added, they are sequentially heat-fitted onto the motor shaft 2, and an interference fit is adopted between the rotor radial magnetic bearing 52 and the lower rotor sensor 74 and the motor shaft 2; S5. Assemble the lower balancing plate 72 onto the motor shaft 2 and tighten it with bolts. The lower balancing plate 72 and the motor shaft 2 are matched with a gap, and the end surface of the lower balancing plate 72 is pressed onto the end surface of the lower rotor sensor 74; S6. The lower shaft head 4 is cold-fitted into the third fixing hole 22, and an interference fit is adopted between the lower shaft head 4 and the third fixing hole 22; S7. Install the lower liner ring 41 onto the lower shaft head 4, and an interference fit is adopted between the lower liner ring 41 and the lower shaft head 4; S8. The upper rotor radial magnetic bearing 51 and the upper rotor sensor 73 are sequentially heat-fitted onto the flywheel connecting shaft 11, and an interference fit is adopted between the upper rotor radial magnetic bearing 51 and the upper rotor sensor 73 and the flywheel connecting shaft 11; S9. The thrust plate 71 is assembled to the flywheel connecting shaft 11, and the thrust plate 71 is locked on the flywheel connecting shaft 11 by bolts, and a clearance fit is adopted between the thrust plate 71 and the flywheel connecting shaft 11; S10. The upper shaft head 3 is cold-installed into the first connecting hole 12, and the upper shaft head 3 and the first connecting hole 12 are interference fit; the upper inner liner ring 31 is heat-installed onto the upper shaft head 3, and the upper inner liner ring 31 and the upper shaft head 3 are interference fit.

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