JPS622929Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hydraulic electric machine in which a hydraulic machine is incorporated inside a rotating electrical machine, and is particularly aimed at improving the bearing portion.

An example of this type of hydraulic electric machine in which a hydraulic machine is provided inside a rotating electric machine is shown in FIGS. 1a and 1b. FIG. 1a is a partially cutaway perspective view, and FIG. 1b is a longitudinal sectional view. This hydraulic electric machine uses the impeller as the rotor spider and the guide vane as the bearing support arm, making it lightweight, compact, and low cost.Furthermore, the axial length is shortened, making it easier to install. The degree of freedom is improved. The machine shown in FIG. 1 will be briefly explained below. Note that this example is an example of a power generation device.

In the figure, 1 is a frame, and 2 is a stator core, which is attached to the inner periphery of the frame 1. 3 is a stator coil, which is attached to the stator core 2. 4 and 4a are flanges, which are attached to both sides of the frame 1. Reference numeral 5 denotes an intermediate frame, which is attached to both sides of the frame 1 inside the flanges 4 and 4a, and is connected to each other in a watertight manner by a canned member 5a. Reference numeral 6 denotes a guide vane, one end of which is attached to the radially inner side of one flange 4. A hollow guide vane boss 7 is attached to the other end of each guide vane 6 and also serves as a bearing housing. Reference numeral 8 denotes bearings, each of which is mounted within the guide vane boss (bearing housing) 7. A rotating shaft 9 is supported by a bearing 8, and a runner vane boss 9a is integrally fitted around the end thereof.
10 is a shaft seal, which is attached to the runner vane boss 9a of the guide vane boss 7 to seal the bearing 8 watertightly.
It is mounted on the side. Reference numerals 11 and 12 designate caps, and the cap 11 is formed into a streamlined shape and is watertightly attached to the side opposite to the runner vane boss 9a of the guide vane boss 7 in order to prevent water from entering the bearing 8 and not to disturb the flow of water. and cap 12
is attached to the runner vane boss 9a.
13 is the runner vane, runner vane boss 9
A rotor holding ring 14 is attached to the outer circumference of each runner vane 13.
A rotor 15 is attached to the outer periphery of the rotor holding ring 14. Reference numeral 16 denotes a labyrinth seal structure, which is provided to seal between the rotor holding ring 14 and the water passage guide portion 4b formed to protrude axially inward from each flange 4, 4a. This example is configured as a cage-type induction generator, and when the rotor 15 together with the runner vanes 13 is rotated at a synchronous speed or higher due to the flow of water, electric power is output from the stator coil 3. Note that synchronous generators and DC generators are also used as generators. Also, if used as an electric motor instead of a generator, it will work as a pump.

However, this type of hydroelectric machine has the following problems. That is, since a large axial thrust is generally applied to an axial flow pump or a propeller water turbine, the bearing 8 is required to have a large capacity that can also receive the thrust load. This means that the bearing 8 becomes larger and the guide vane boss 7 that accommodates the bearing 8 becomes larger.
becomes larger in diameter. As a result, the water flow path becomes smaller, resulting in a reduction in power generation capacity and a reduction in pump water supply capacity. For this reason, the advantages of this type of hydroelectric machine, which are lightweight, compact, and low-cost, are lost.

The purpose of the present invention is to provide a hydraulic electric machine that solves such problems, and as shown by the symbols A and B in Fig. Therefore, we focused on the fact that there are spaces A and B inside the guide vane boss 7 and the cap 11, although they are narrow.
Or/and B is used to provide an auxiliary magnetic bearing to bear part of the axial thrust (thrust), thereby reducing the size of the bearing 8 and extending its life. This is intended to reduce the size of the guide vane boss and increase its capacity by storing it in the guide vane boss. Hereinafter, the present invention will be explained along with examples with reference to the drawings. In each of the embodiments, the present invention is applied to a hydroelectric machine as a power generation device shown in Fig. 1, and each figure shows only the main parts of the present invention, and the same parts in the figures are denoted by the same reference numerals. is attached.

FIG. 2 shows a partially broken main part of an embodiment of the present invention. In the case of a power generation device, when water flows in the direction of arrow C, axial thrust acts in the direction of arrow D due to rotation of the runner vane 13. So Cap 11
Using the space A in the cap, the magnetic bearing 1 is attached to the cap 11.
An electromagnetic yoke 17 is formed and an electromagnetic coil 17a is provided. This electromagnet generates magnetic lines of force along the axis of rotation 9. At the same time, a magnetic disc or suction plate 18 is attached to the end of the rotating shaft 9 on the cap 11 side.
was fitted. There is no contact between the suction plate 18 and the electromagnet, and a gap g is provided between them.

On the other hand, a generator for exciting the electromagnetic coil 17a is provided in the space B between the bearings 8. This generator is composed of a generator rotor 19 (usually a permanent magnet rotor) attached to the outer circumference of a rotating shaft 9 and a generator stator 20 attached to the inner circumference of the guide vane boss 7. Electricity generated by the generator is supplied to the electromagnetic coil 17a via the lead wire 21 of the generator stator 20. This generator and the magnetic bearing are connected only by a lead wire 21, and the magnetic bearing is activated immediately when the rotating shaft 9 rotates. Incidentally, when an alternating current generator is used as the generator as in this embodiment, an exciting current is supplied through the rectifier 22, but a direct current generator may also be provided.

Further, in the embodiment shown in FIG. 3, both the magnetic bearing and the generator are provided between the bearings 8, that is, by using the space B, and the electromagnetic yoke 17 is formed on the guide vane boss 7. However, this electromagnetic yoke 17 is provided with an electromagnetic coil 17a. Note that the other configurations are the same as the embodiment shown in FIG. 2, so the explanation thereof will be omitted.

In this way, we have provided a magnetic bearing that takes part of the axial thrust by utilizing the space A and/or B of the guide vane boss 7, and also provided a generator for this magnetic bearing, making it possible to reduce the size of conventional bearings. can be converted into
As a result, the guide vane boss can be made smaller in diameter, increasing the water flow area and improving performance as a hydraulic electric machine, such as power generation capacity. In addition, since a generator for the magnetic bearing is installed, there is no need to supply power from the outside via a lead wire, making handling extremely easy, and the magnetic bearing is always working while the rotating shaft is rotating. For example, even if the external power supply fails during full-load operation, the magnetic bearing works to prevent accidents such as bearing burnout. Furthermore, for example,
Even if there is a sudden change from full load to no load, the power supplied from the generator increases as the rotational speed of the rotating shaft increases, reducing the bearing load and greatly improving the reliability of hydroelectric machines. I can do it.

Incidentally, each of the above-mentioned embodiments is an example in which the present invention is applied to a hydroelectric machine as a power generation device shown in Fig. 1, but it goes without saying that the present invention can be applied to a hydroelectric machine as a pump device. The present invention can be applied to any type of pump device without any restriction on the type of the rotating electric machine part.

As described above in detail with the embodiments, according to the present invention, a small-sized, large-capacity, and highly reliable hydraulic electric machine can be obtained.

[Brief explanation of the drawing]

Figures 1a and 1b show an example of a conventional hydraulic electric machine to which the present invention is applied, where a is a partially cutaway perspective view, and b
2 is a vertical sectional view showing the main part of one embodiment of the present invention, and FIG. 3 is a vertical sectional view showing the main part of another embodiment. In the drawings, 1 is a frame, 2 is a stator core, 3 is a stator coil, 4 and 4a are flanges, 5 is an intermediate frame, 6 is a guide vane, 7 is a guide vane boss, 8 is a bearing, 9 is a rotating shaft, 9a is a runner vane boss, 10 is a shaft seal, 11 is a cap, 13
14 is a runner vane, 14 is a rotor holding ring, 15 is a rotor, 16 is a labyrinth seal structure, 17 is an electromagnetic yoke, 17a is an electromagnetic coil, 18 is a suction plate, 19 is a generator rotor, 20 is a generator stator ,
21 is a lead wire, 22 is a rectifier, is a magnetic bearing,
is a generator, A and B are spaces, and g is a void.

Claims (1)

[Scope of utility model registration request] A stator is attached to the inner circumference of the frame, a guide vane is attached via a flange, a guide vane boss is attached to the center of this guide vane, a cap is attached to one end of the guide vane boss, and a cap is attached to the guide vane boss. A hydraulic electric machine in which a rotating shaft is supported via a bearing, a rotor is attached to the outer periphery of an impeller attached to the rotating shaft via a rotor holding ring, and the rotor is provided so as to face the stator. A magnetic bearing comprising a suction plate fixed to the rotating shaft and an electromagnet that attracts the suction plate in a direction opposite to the axial thrust and bears a part of the axial thrust is provided inside the guide vane boss or the cap or both. A rotor of a generator that supplies power to the magnetic bearing is attached to the rotating shaft in the guide vane boss or cap, and a stator is provided on the inner periphery of the guide vane boss or cap to face the rotor of the generator. A hydroelectric machine having a magnetic bearing, characterized in that: