JPH04325777A - Hydraulic machinery - Google Patents

Abstract

PURPOSE:To secure concentricity simply in a movable guide vane supporting bearing provided at the upper and lower cover of a runner to support a movable guide vane by providing the movable guide vane supporting bearing independently of the lower cover, and then adjusting-assembling this bearing to the rather large bearing fitting part of the lower cover. CONSTITUTION:A movable guide vane for regulating pressure water from an iron duct in a hydraulic power plant so as to lead the regulated pressure water to a runner 2 is rotatably supported by a movable guide vane supporting bearing provided at an upper cover 3 and a lower cover 4 for covering the runner 2. In this case, the movable guide vane supporting bearing is formed of a movable guide vane bearing table 4d provided with a flange, and a bush 4e press- fitted into the bush hole of the bearing table 4d, and provided independently of the lower cover 4. This movable guide vane supporting bearing is then fitted to the lower cover 4 side bearing fitting part formed in larger measure than the body measure of the movable guide vane supporting bearing while adjusting the concentricity with the bush hole on the upper cover side. A nonshrink filler is further filled into a water flowing face side gap between the lower cover 4 and the movable guide vane bearing table 4d.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

[Industrial Field of Application] The present invention provides movable guide vanes that regulate pressure water led from iron pipes of a hydroelectric power plant and guide it to a runner. This invention relates to a hydraulic machine rotatably supported by a bearing.

0002

[Prior Art] Figure 4 shows an example of a cross section of a Francis turbine, which is one of the hydraulic machines used in hydroelectric power plants. 2 are directly connected. The runner 2 is surrounded by an upper cover 3 and a lower cover 4 connected to a suction pipe (not shown), and a movable guide vane 5 for controlling the flow of water is provided around the outer periphery of the pressure water inlet. .

[0003] This movable guide vane 5 has an upper cover 3 and a lower cover 4.
It is rotatably supported by the iron pipe line (
A stay ring 8 having a plurality of fixed guide vanes 7 for guiding water to the movable guide vanes 5 is fixed to the casing 6 .

In a water turbine having such a configuration, the rotatable support of the upper cover 3 and the movable guide vane 5 and the rotatable support of the lower cover 4 and the movable guide vane 5 are conventionally implemented as shown in FIG. The upper cover bushing hole 3b of the upper cover 3 and the lower cover bushing hole 4b of the lower cover 4 are machined with high precision at the factory, respectively, and the upper cover bushing 3c is inserted into the upper cover bushing hole 3b, and the lower cover bushing 4c is inserted into the lower cover bushing hole 3b. They are inserted and assembled into the respective bush holes 4b.

In this way, the movable guide vane 5 is attached to the upper cover 3.
The lower cover 4 is rotatably supported while maintaining a small gap (side gap) between the lower cover 4 and the lower cover 4.

[0006]

However, in order to maintain a small gap (side gap) between the upper cover 3 and the lower cover 4 and rotate the movable guide vanes 5 without any trouble, it is necessary to It is necessary to precisely machine the concentricity between the cover bush hole 3b and the lower cover bush hole 4b of the lower cover 4. If the concentricity between the upper cover bushing hole 3b of the upper cover 3 and the lower cover bushing hole 4b of the lower cover 4 is out of alignment, the movable guide vane 5 will tilt and move with the water surface of the upper cover 3 and lower cover 4. Galling may occur between the guide vanes 5 and the movable guide vanes 5 may become inoperable.

Conventionally, in order to avoid such problems, the upper cover bushing hole 3b of the upper cover 3 and the lower cover bushing hole 4b of the lower cover 4 are machined using a template or machined using a computer so that they are concentric. It is processed using numerically controlled machine tools.

[0008] In recent years, the size of hydraulic machines has become remarkable due to an increase in the capacity of a single machine, and needless to say, a commensurately large machine tool is required in order to accurately machine the upper cover 3, lower cover 4, etc. Such large-scale mechanical equipment has extremely high equipment costs and processing costs, and it also costs a lot of money to make templates. Therefore, the manufacturing cost of the upper cover 3 and the lower cover 4 becomes extremely high.

[0009] In addition, there are few manufacturers that have large-scale mechanical equipment with good precision, and therefore manufacturing bases are limited. Due to limitations in terms of mechanical equipment, currently the single machine capacity of hydraulic machinery is limited. There are limits to the increasing trend,
In order to overcome this problem, a fundamental review of the structure of hydraulic machinery is required. Incidentally, each of the parts constituting the above-mentioned hydraulic machine is formed and completed by welding, machining, etc. in a factory, and then installed and assembled at a power plant. When assembling at the power plant site, the casing 6 and the stay ring 8
Parts to be buried in concrete, such as the lower cover 4 and the lower cover 4, are installed first, and then non-concrete objects such as the upper cover 3 are assembled.

[0010] In recent years, as hydraulic machines have become larger due to increased single machine capacity, the casing 6 has become larger due to transportation restrictions.
and the stay ring 8 are manufactured separately and often assembled by welding during installation at the power plant site.

Furthermore, concrete is poured around the casing 6 and stay ring 8 that have been welded and assembled in this way, and the lower cover 4 bolted to the stay ring 8 to fix them. Due to the buoyancy of the concrete and the heat generated by the concrete during hardening, the roundness and levelness of the staying flange surface 8a and the lower cover 4 are distorted.

This deviation naturally affects the concentricity of the bush holes 3b and 4b of the upper cover 3 and lower cover 4, and the movable guide vane 5
Problems may occur, such as the inability to assemble the parts or the inability to rotate smoothly.

[0013] As mentioned above, with the recent tendency to increase the capacity of single units of hydraulic machinery, problems arising from mechanical equipment constraints at the manufacturing stage and installation and assembly conditions at the power plant site have gradually come into focus. The situation is becoming such that we are forced to fundamentally reconsider the structure of hydraulic machinery.

[0014] The present invention has a configuration that can greatly reduce the requirements for mechanical equipment in order to facilitate the manufacture of the lower cover, which is one of the largest component parts of a large hydraulic machine with a large capacity. However, due to machining, the concentricity of the bush holes between the upper cover and lower cover may be incorrect, or when the casing/stalling and lower cover are buried in concrete at the power plant site, the staying flange may be damaged due to heat or buoyancy. Even if the roundness or horizontality of the surface and lower cover are out of order, the concentricity of the bushing holes in the upper cover and lower cover can be easily adjusted without any correction work, and the movable guide vane To provide a hydraulic machine that can maintain an appropriate gap size between the flowing water surface of an upper cover and a lower cover and can rotate smoothly. [Structure of the invention]

[0015]

[Means for Solving the Problems] In the hydraulic machine of the present invention, the movable guide vane support bearing is provided independently of the lower cover, and the movable guide vane support bearing is provided on the lower cover to support the movable guide vane support bearing. A bearing mounting part larger than the fuselage size is provided, and the movable guide vane support bearing is press-fitted into a movable guide vane bearing stand having a flange on the upper part of the fuselage and a bushing hole provided in this movable guide vane bearing stand. and a bush for supporting the movable guide vane.

[0016]

[Operation] In the present invention, since the structure is such that the bearing stand 4d for the movable guide vane of the lower cover 4 is adjusted and assembled in accordance with the center of the bush hole 3b of the upper cover 3, the upper cover 3 and the lower cover 4 are
It is not necessary to bore the bush holes 3b and 4b concentrically with the bushing holes 3b and 4b, and therefore the overhaul period and overhaul cost can be reduced.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same components as shown in FIG. 4 are designated by the same reference numerals and their explanations will be omitted.

As shown in part A of FIG. 1, the lower cover 4 has been processed to assemble a movable guide vane support bearing. That is, a bearing mounting portion for supporting the movable guide vane support bearing is provided. On the other hand, the movable guide vane support bearing is manufactured as an independent component separate from the lower cover, and as shown in Fig. 2, the bearing is composed of a movable guide vane bearing stand 4d having a flange on the upper part of the body and a bush 4e. ing.

The bush 4e is a bearing stand 4d for the movable guide vane.
It is press-fitted into the movable guide vane bearing stand 4d by tightening it with a set screw.

The outer diameter of the body of the movable guide vane bearing stand 4d is smaller than the size of the bearing mounting portion of the lower cover 4, and is supported by the lower cover 4 at the flange portion. Therefore, the concentricity with the bush hole 3b on the upper cover side can be adjusted. Further, the structure is such that the non-shrinkage filler 11 can be injected into the gap provided on the water surface side between the lower cover 4 and the movable guide vane bearing stand 4d.

The bearing stand 4d for the movable guide vane is inserted into the bush hole 3 on the upper cover side during installation and assembly at the hydroelectric power plant site.
After adjusting the concentricity with b, it is assembled to the lower cover 4 using knock pins 9 and bolts 10.

[0022] Also, the lower cover 4 and the bearing stand 4d for the movable guide vane.
By injecting and solidifying the non-shrinkage filler 11 into the gap provided on the water surface side between the knock pin 9 and the non-shrinkage filler, the bearing stand 4d for the movable guide vane is fixed and the radial load applied to the bearing is reduced between the knock pin 9 and the non-shrinkage filler 11. 11.

FIG. 3 shows another embodiment, in which the bearing mounting portion of the movable guide vane support bearing is a through hole, and the movable guide vane bearing stand 4d is provided with a bush hole. Even with such a configuration, the same effect as that of FIG. 2 can be obtained.

As described above, according to the embodiment of the present invention, the inner diameter of the bearing mounting portion of the movable guide vane bearing pedestal 4d of the lower cover 4 is machined to be larger than the outer diameter of the movable guide vane bearing pedestal 4d. During installation and assembly at the hydroelectric power plant site, the movable guide vane bearing stand 4d is assembled to the lower cover 4 after adjusting the concentricity based on the bush hole 3b on the upper cover side. There is no need to machine the bush hole 3b and the movable guide vane bearing stand 4d of the lower cover 4 so that they are concentric.

[0025] Furthermore, even a manufacturer that does not have a machine tool with high indexing accuracy can manufacture large-sized upper cover 3 and lower cover 4.

When concrete is cast and fixed around the casing 6, stay ring 8, lower cover 4, etc. that have been welded and assembled during the on-site installation of the power plant, the buoyancy of the concrete and the heat generated when the concrete hardens can cause damage. The roundness and horizontality of the upper cover mounting flange surface 8a of the stay ring 8 and the lower cover 4 may be distorted. However, in this case as well, by adjusting the movable guide vane bearing base 4d of the lower cover 4, it is possible to restore the bush hole 3b of the upper cover 3 and the movable guide vane bearing base 4d of the lower cover 4 to be concentric. It is possible.

[0027]

Effects of the Invention As described above, according to the present invention, when the casing, stayling, lower cover, etc., welded and assembled during on-site installation of a power plant are buried in concrete, the buoyancy of the concrete and the heat generated during hardening can be reduced. Even if the upper cover mounting flange surface of the stayling or the roundness or horizontality of the lower cover is out of order, by adjusting the movable guide vane support bearing of the lower cover, it will be possible to match the bush hole on the upper cover side. Cordity can be ensured, and therefore, the movable guide vane can maintain an appropriate gap size between the water flow surfaces of the upper cover and the lower cover, and can rotate favorably.

Furthermore, when overhauling the water turbine at the power plant site, the bush holes in the upper cover and lower cover are simultaneously bored to restore concentricity while the upper cover and lower cover are assembled to the stay ring. However, by adjusting and assembling the movable guide vane support bearing of the lower cover as described above,
Concentricity with the bush hole on the upper cover side can be ensured.

Therefore, it is not necessary to bore the bush holes of the upper cover and the lower cover concentrically, thereby shortening the overhaul period and reducing the overhaul cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hydraulic machine showing an embodiment of the present invention.

FIG. 2 is a detailed view of part A in FIG. 1;

FIG. 3 is a sectional view of a hydraulic machine showing another embodiment of the present invention.

FIG. 4 is a sectional view showing a conventional example.

FIG. 5 is a detailed view of a portion of FIG. 4;

[Explanation of symbols]

1 Main shaft 2 Runner 3 Upper cover 3b Upper cover bushing hole 3c Upper cover bush 4 Lower cover 4b Lower cover bushing hole 4c Lower cover bush 4d Bearing stand for movable guide vane 4e Bush 5 Movable guide vane 6 Casing 7 Fixed guide vane 8. Staling 8a　　　　Stealing flange surface 9 Dowel pin 10 bolts 11. Non-shrinkage filler 12 O-ring

Claims (1)

[Claims] Claim 1: A movable guide vane that regulates pressurized water led from an iron pipeline of a hydroelectric power plant and guides it to a runner is rotatable by a movable guide vane support bearing provided on an upper cover and a lower cover that cover the runner, respectively. In the supported hydraulic machine, the movable guide vane support bearing is provided independently of a lower cover, and the lower cover has a diameter larger than the body size of the movable guide vane support bearing in order to support the movable guide vane support bearing. A bearing mounting part is provided, and the movable guide vane support bearing is press-fitted into a movable guide vane bearing stand having a flange at the upper part of the body and a bush hole provided in this movable guide vane bearing stand to support the movable guide vane. A hydraulic machine characterized by comprising a bush for support.