Bearing of rotary electrical machine

Abstract

A bearing (100) of a rotary electrical machine according to the present disclosure comprises an inner ring 1 (1a, 1b) that is made of resin and rotatably supports a shaft 3, and an outer ring 2 (2a, 2b) that supports the inner ring 1 (1a, 1b) from the outside. The inner ring 1 (1a, 1b) is made of polyether ether ketone, and the inner ring 1 (1a, 1b) and the outer ring 2 (2a, 2b) are each divided in the circumferential direction.

Description

Bearings of Rotating Electrical Machines

[0001] The present disclosure relates to bearings of rotating electrical machines.

[0002] In the sleeve bearing of a turbine generator, for example, like the bearing described in Patent Document 1, by making the white metal part have a split structure, the white metal part can be replaced when wear and damage occur in the white metal part.

[0003] Japanese Patent Application Laid-Open No. 2018-159462

[0004] However, in the configuration of Patent Document 1, there are problems that the processing of the bearing to be replaced is not easy and the adjustment of the production period is difficult. Also, there is a problem that the weight of the bearing to be replaced is heavy and the replacement is not easy.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a bearing of a rotating electrical machine that is easy to process the bearing to be replaced, can shorten the production period, and is easy to replace.

[0006] The bearing of the rotating electrical machine in the present disclosure is characterized by including an inner ring made of resin that rotatably supports a shaft, and an outer ring that supports the inner ring from the outside.

[0007] According to the present disclosure, the processing of the bearing to be replaced is easy, the production period can be shortened, and the replacement can be easily performed.

[0008] It is a perspective view showing the configuration of the bearing of the rotating electrical machine according to Embodiment 1. It is a flowchart showing the procedure of the inner ring replacement method in the bearing of the rotating electrical machine according to Embodiment 1. It is a perspective view showing the inner ring replacement method in the bearing of the rotating electrical machine according to Embodiment 1.

[0009] Embodiment 1. Figure 1 is a perspective view showing the configuration of a bearing 100 for a rotating electric machine according to Embodiment 1 of the present disclosure. As shown in Figure 1, the bearing 100 for the rotating electric machine consists of an inner ring 1 that rotatably supports the shaft of the rotating electric machine and an outer ring 2 that supports the inner ring 1 from the outside. While the size of the generator is a cylindrical shape with a diameter of about 5 m and a length of about 12 m, the size of the bearing 100 for the rotating electric machine is, for example, a length of 900 mm, an outer diameter of the outer ring 2 of 1150 mm, and an inner diameter of the inner ring 1 of about 700 mm. The inner ring 1 and the outer ring 2 each have a segmented structure. Note that the number of segments is not limited to 2.

[0010] The inner ring 1 consists of a first inner ring 1a that supports the shaft of the rotating electric machine from above, and a second inner ring 1b that supports the shaft of the rotating electric machine from below. The inner ring 1 (1a, 1b), which is a feature of this disclosure, is made of polyetheretherketone (hereinafter referred to as PEEK). The electrical resistance of PEEK as the inner ring 1 (1a, 1b) is 7 × 10⁻¹⁰ ９ Use materials with a value of Ωm or greater. 7 × 10 ９ If the resistance is less than Ωm, there is a possibility of damaging the generator due to electrolytic corrosion.

[0011] In bearings for rotating electrical machinery, the use of resin generally presents a problem: because it does not undergo plastic flow, scratches tend to remain, and the unevenness caused by these scratches thins the oil film. PEEK, however, has excellent mechanical strength and heat resistance, and can maintain stable physical properties even in high-temperature environments, making it suitable for bearings in rotating electrical machinery.

[0012] When PEEK is used for the inner rings 1 (1a, 1b) of the bearing 100 of a rotating electric machine, stable machining is possible, and the inner rings can be easily manufactured and replaced when they wear out. Furthermore, since they only need to be manufactured when the inner rings are replaced, manufacturing costs can be reduced.

[0013] The outer ring 2 consists of a first outer ring 2a that supports the first inner ring 1a from above, and a second outer ring 2b that supports the second inner ring 1b from below.

[0014] Next, a method for replacing the inner rings 1 (1a, 1b) in the bearing 100 of a rotating electric machine according to Embodiment 1 of this disclosure will be described with reference to Figures 2 and 3. Figure 2 is a flowchart showing the procedure for replacing the inner rings 1 (1a, 1b) in the bearing 100 of a rotating electric machine. Figure 3 is a perspective view illustrating the method for replacing the inner rings 1 (1a, 1b) in the bearing 100 of a rotating electric machine.

[0015] First, in the bearing 100 of the rotating electric machine, which has worn inner rings 11a and 11b supporting the shaft 3 of the rotating electric machine as shown in Figure 3A, the bolts that fix the outer rings 2a and 2b supporting the worn inner rings 11a and 11b are removed (step S201 in Figure 2).

[0016] Next, as shown in Figure 3B, remove the upper outer ring 2a (step S202 in Figure 2).

[0017] Next, as shown in Figure 3C, the worn upper inner ring 11a is removed (step S203 in Figure 2).

[0018] Next, as shown in Figure 3D, a new inner ring 1a is installed in the position where the worn inner ring 11a of the rotating electric machine bearing 100 was located (step S204 in Figure 2).

[0019] Next, as shown in Figure 3E, the outer ring 2a is returned to its original position above the new inner ring 1a (step S205 in Figure 2).

[0020] Similarly, after removing the lower outer ring 2b (step S206 in Figure 2), the worn lower inner ring 11b is removed (step S207 in Figure 2), a new inner ring 1b is installed (step S208 in Figure 2), and the outer ring 2b is returned to its original position above the new inner ring 1b (step S209 in Figure 2).

[0021] Finally, as shown in Figure 3F, the outer rings 2a and 2b that support the new inner rings 1a and 1b are securely fixed together with bolts (step S210 in Figure 2), and the inner rings 1a and 1b are fitted onto the outer rings 2a and 2b according to the fitting tolerances, etc., to prevent them from shifting.

[0022] In this way, by using PEEK for the inner rings 1a and 1b, the inner rings can be easily manufactured and replaced when they wear out. Furthermore, since they only need to be manufactured when the inner rings are replaced, manufacturing costs can be reduced. In addition, by using insulating material for the inner rings 1a and 1b, the number of shaft insulating materials in the rotating electric machine can be reduced.

[0023] As described above, the bearing 100 of the rotating electric machine according to this embodiment 1 comprises inner rings 1a and 1b made of PEEK that rotatably support the shaft 3, and outer rings 2a and 2b that support the inner rings 1a and 1b from the outside. Since the inner rings 1a and 1b and the outer rings 2a and 2b are each divided in the circumferential direction, the inner rings can be easily manufactured and replaced when they wear out. Furthermore, since they only need to be manufactured when the inner rings are replaced, manufacturing costs can be reduced. In addition, by making the inner rings 1a and 1b insulators, the number of shaft insulating members in the rotating electric machine can be reduced.

[0024] While this disclosure describes various exemplary embodiments, the various features, aspects, and functions described in the embodiments are not limited to the application of any particular embodiment, but are applicable individually or in various combinations to the embodiments. Accordingly, countless variations not illustrated are conceivable within the scope of the technology disclosed herein. For example, these include modifying, adding, or omitting at least one component, or extracting at least one component and combining it with other components.

[0025] 1. Inner ring, 1a. Upper inner ring, 1b. Lower inner ring, 2. Outer ring, 2a. Upper outer ring, 2b. Lower outer ring, 3. Shaft, 100. Bearing for a rotating electric machine.

Claims

1. A bearing for a rotating electric machine, characterized by comprising an inner ring made of polyetheretherketone that rotatably supports the shaft, and an outer ring that supports the inner ring from the outside.

2. The inner ring has an electrical resistance of 7 × 10 ９ The bearing of a rotating electric machine according to claim 1, characterized in that it is Ωm or greater.

3. The bearing for a rotating electric machine according to claim 1 or 2, characterized in that the inner ring and the outer ring are each divided in the circumferential direction.

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