JPS623658B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylindrical water wheel rotary electric machine, and more particularly to a rotor of a horizontal shaft type that is rotatably supported and rotationally driven by the water wheel, and a rotor having a predetermined gap around the outer periphery of the rotor. a stator frame that covers the circumference of the stator to prevent water from entering the rotor and the stator, and holds the stator;
A support body holds the stator frame approximately in the center of the waterway, and the support body has a spherical shape between the stator frame and a concrete wall facing the stator frame via the waterway. This invention relates to a cylindrical water wheel rotating electric machine that is connected with two sliding surfaces.

As is well known, in a cylindrical water wheel rotating electrical machine, such as a cylindrical water turbine generator, a water wheel and a generator are installed in a cylindrical flow channel, and the water wheel is rotated by the force of flowing water, which connects it to the water wheel. The generator that is running generates electricity. Therefore, the cylindrical water turbine generator is held in the center of the waterway so that the surrounding area forms a waterway, and the holding is generally carried out by a rod-shaped support having a shape that does not create resistance to flowing water.

Conventional examples of this cylindrical water turbine generator are shown in Figures 1 and 2.
As shown in the figure. The cylindrical water turbine generator consists of a water wheel 1, a generator 4 formed from a rotor 2 and a stator 3, and is installed in a waterway 5. The waterway 5 includes a water turbine casing 6, a stator frame 7, and a cone 8.
It is formed by a cylindrical space between the concrete wall 9 and the concrete wall 9. The cylindrical water turbine generator is supported by an upper support 10 and a lower support 11 that protrude from the water turbine casing 6, and is supplemented by vertical supports provided at the bottom and horizontal sides of the stator frame 7, respectively. It is supported by a body 12 and a horizontal support 13.

In the cylindrical water turbine generator configured and supported in this way, rotational torque of the cylindrical water turbine generator, buoyancy, axial force, that is, thrust force, etc. generated on the water turbine 1 are applied to the stator frame 7 in particular. However, these forces are mainly borne by the upper and lower supports 10 and 11. Of course, part of the buoyant force is borne by the vertical support 12, and the horizontal force of the unbalanced flowing water generated by the water turbine 1 is borne by the horizontal support 13. The reason why the burden of the vertical support 12 and the horizontal support 13 is borne partially as an auxiliary burden as described above is because
This is because of the following reasons. In other words, in order to firmly support the cylindrical water turbine generator, it is sufficient to provide a number of sturdy supports between the stator frame 7 and the concrete wall 9, but the stator frame 7 is This is because there is thermal expansion and contraction due to the temperature of water flowing around the stator frame 7, so it is necessary to ensure a certain degree of freedom.

By the way, cylindrical water turbine generators have high efficiency at low heads, so they are mainly used for low heads (about 4 to 15 m), but as the momentum for effective utilization of water resources increases recently, their application is increasing. It is expanding. Moreover, not only are the applications expanding, but also the capacity of a single unit is increasing, and stator frames 7 with outer diameters exceeding 6 m are emerging. As the stator frame 7 becomes larger in diameter, that is, the stator 3 becomes larger in diameter, its rigidity relatively decreases. On the other hand, displacement due to external force due to buoyancy during operation, displacement in the circumferential direction due to rotational torque, change due to axial force generated in the water turbine 1, etc. become large, so that the stator frame 7 is deformed.

A support body 1 that supports the stator frame 7 to prevent the stator frame 7 from being deformed, that is, a horizontal support body 1
3 and the vertical support 12, for example the horizontal support 13
As shown in FIG. 3, a spherical sliding surface 14 was used.
That is, the stator frame and the concrete wall facing the stator frame via the waterway are supported by supports (horizontal and vertical) having spherical sliding surfaces 14. Grease is applied to the sliding surface 14 so that the sliding movement of the sliding surface 14 can be smoothed and increased to cope with displacement during operation. However, since this sliding surface is located underwater, the applied grease is washed away by the water during operation, and the sliding surface 14 does not slide smoothly, causing displacement or deformation during operation. There was a concern that the stator frame would deform.

The present invention has been made in view of the above points,
The purpose is to provide a cylindrical water turbine rotating electric machine in which deformation of the stator frame is prevented.

That is, the present invention provides grease reservoir grooves on the sliding surface of the support so as to face each other, and a grease injection hole with one end communicating with the grease reservoir groove and the other end opening to the water channel side. is provided in a part of the support body, and a plug is provided at the waterway side opening of this grease injection hole to seal this opening, and a plug is provided on the sliding surface and around the grease reservoir groove. The intended purpose is achieved by providing a ring-shaped packing that seals the groove and the waterway.

The present invention will be explained below based on the illustrated embodiments. FIG. 4 shows an embodiment of the present invention. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, grease reservoir grooves 16 are provided on the sliding surface 14 of the support body (horizontal support body 15) so as to face each other, and the support body is provided with grease reservoir grooves 16 that communicate with the grease reservoir grooves 16 and are connected to the outside, that is, water channels. A grease injection hole 17 opened on the side is provided, and a packing 18 is provided on the sliding surface 14 and around the grease reservoir groove 16. By doing this, the sliding surface 14 has the grease injection hole 1.
Grease injected into the grease reservoir groove 16 from 7 is constantly replenished. Furthermore, since the packing 18 is provided on the sliding surface 14 surrounding the grease reservoir groove 16, the replenished grease is not washed away by water. Therefore, the sliding surface 14 always retains grease and slides smoothly, and the displacement during operation of the electric machine, that is, displacement due to external force based on buoyancy, circumferential displacement due to rotational torque, and displacement due to axial force generated on the water turbine. etc., the stator frame can be well supported, and deformation of the stator frame can be prevented. Moreover, since the sliding surface 14 can be replenished with grease from the grease injection hole 17 during periodic inspections of electrical equipment, there is no need to dismantle the horizontal support 15 each time. In the figure, reference numeral 19 is a plug, which prevents the grease injected into the grease reservoir 16 from flying out or being exposed to water. Furthermore, in this embodiment, among the supports that support the stator frame, the horizontal support 15 has been described, but the same applies to the vertical supports.

As described above, according to the present invention, grease is always retained on the sliding surface of the support that supports the stator frame, so that the sliding surface can slide smoothly and during operation. The stator frame can be well supported, and deformation of the stator frame can be sufficiently prevented.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional cylindrical water wheel rotating electric machine, Figure 2 is a front view of a conventional cylindrical water wheel rotating electric machine,
FIG. 3 is an enlarged view of the A-frame portion in FIG. 2, and FIG. 4 is an explanatory view of the sliding portion of the horizontal support body of an embodiment of the cylindrical water turbine rotating electric machine of the present invention. DESCRIPTION OF SYMBOLS 1...Waterwheel, 2...Rotor, 3...Stator, 5...Waterway, 7...Stator frame, 14...Sliding surface, 15...Horizontal support body (support body), 16...Grease reservoir groove, 17...
Grease injection hole, 18...Packing, 19...Plug.

Claims (1)

[Claims] 1. A horizontal shaft type rotor that is rotatably supported and rotationally driven by a water wheel; an annular stator disposed on the outer periphery of the rotor with a predetermined gap;
a stator frame that covers the stator to prevent water from entering the rotor and stator and holds the stator; and a stator frame that holds the stator frame approximately in the center of the waterway. and a support body that connects the stator frame and a concrete wall facing the stator frame via the waterway with a spherical sliding surface. In the cylindrical water turbine rotating electric machine, grease reservoir grooves are provided on the sliding surfaces of the supports so as to face each other, one end communicates with the grease reservoir groove, and the other end opens to the waterway side. A grease injection hole is provided in a part of the support, a plug is provided at the waterway side opening of the grease injection hole to seal the opening, and a plug is provided on the sliding surface and around the grease reservoir groove. ,
A cylindrical water wheel rotating electrical machine characterized by being provided with a ring-shaped packing that seals the grease reservoir groove and the waterway.