JPS62101887A - Assembling method for francis turbine - Google Patents

Abstract

PURPOSE:To facilitate the assembly of a Francis turbine at an assembling site by removing components to be removed in a partially assembled condition and assemble a runner thereby reducing the number of processes in disassembly and reassembly. CONSTITUTION:To prevent deformation and loss of alignment due to hardening heat after laying concrete or during welding work in a main assembly work, an upper cover 4, a guide vane 8, a lower cover 5, and a guide vane operating mechanism 7 are assembled. After finishing the main assembly work, the said upper cover 4, guide vane 8, and guide vane operating mechanism 7 are lifted in a set of partially assembled condition. And after attaching a runner 1 and a main shaft 2, the upper cover 4, guide vane 8, and guide vane operating mechanism 7 in the partially assembled condition, as they are, are again assembled.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a method of assembling a Francis turbine.

[Technical background of the invention and its problems]

When assembling a Francis turbine on-site, the runner cover, guide vane, guide vane operating mechanism, etc. are temporarily assembled without using the runner main shaft of the normal rotating part for the purpose of preventing deformation and facilitating set/tearing/rig. When assembling the runner, disassemble and remove these, and after assembling the runner,
Complicated procedures such as reassembly are required. This requires a large amount of money and time.

[Purpose of the invention]

In view of the above problems, the present invention aims to provide a method for assembling a Francis turbine that can be easily assembled at an assembly site.

[Summary of the invention]

The present invention is a 7-runcis water turbine that suspends the upper cover, kite vane, and kite vane operating mechanism, removes it in a partially assembled state, uses the tip of the lower shaft of the guide vane as a guide, and then assembles it into the lower cover and stay ring while hanging as a whole. Assemble using the following assembly method.

[Embodiments of the invention]

Figure 1 shows the main parts of the French 7th waterwheel (one side of the surface is shown,
This shows the assembled state before the runner 1 and spindle 2 are inserted.

During the on-site assembly work of the 7 Rancis water turbine, runner 1
, the following assembly procedure is required before the main shaft 2 is assembled.

First, the stay ring 6 is installed on the support base installed on the concrete foundation at the assembly center and specified level, and using this as a reference, lower cover 5, guide bar/8, upper cover 4, guide page 7 operation mechanism 7t-assembly, casing 3 Main assembly work such as assembly welding and concrete burying is required.

The upper cover 4, guide vane 8, and lower cover 5 are assembled to prevent deformation due to hardening heat during assembly and welding of the casing 3 and after concrete is buried. In particular, the guide vane 8 is assembled to prevent misalignment. It plays an important role.

On the other hand, guide vane operating machine disease 7 has an operating ring, a rondo,
It is composed of a servo motor, etc., and has the function of operating multiple guide vanes 8 at the same time through these mechanisms.It is necessary to decide the installation position of each guide vane 8 on the side of the 6J guide van operating machine. 7 are assembled together with the upper cover 4 and guide bar 78.

By the way, the runner 1 and the main shaft 2 are used during centering work after assembly of the lower cover 5, guide bar 78, upper cover 4, etc. and during welding work of the casing 3, and during deformation of the upper cover 4, lower cover 5, etc. after being buried in concrete. There are some things that cannot be incorporated at the beginning due to reasons such as quantity measurement.

As per the above explanation, the assembly procedure before inserting the runner 1 and the main shaft 2 is as described above, but at the stage of assembling the U/Q 1 and the main shaft 2, the following steps are usually performed: The assembly work process becomes essential. That is, the guide vane operating mechanism 7
, After disassembling the upper cover 4 and guide bar 78, assembling the guide barn 8, runner 1, main +t;! 12, the upper cover 4, and the guide vane operating mechanism 7, which are complicated work steps. These require time and money.

The present invention has been made in view of the above-mentioned problems, and as shown in Fig. 2, an assembly method that enables integral lifting of the guide vane operating mechanism 7, upper cover 4, and guide bar/8, and also enables the integral hanging and assembly of these parts. It comes out. The details will be explained below.

Guide burn operation mechanism 7, upper cover 4, guide vane 8
is assembled into the stay ring 6 and the lower cover 5, the assembly welding work and concrete pouring of the casing 3 are completed, and after the related deformation measurement and centering work are completed, the guide burn operation mechanism 7 and the upper cover 4 are assembled. Instead of sequentially disassembling the guide barn 8 and the like side by side, an assembly method is used in which the above-mentioned parts are lifted up as a whole and then hung up again as shown in FIG.

Here, in order to facilitate the integral hanging operation, the lower shaft 9 of the guide vane and its tip end were formed into a truncated conical shape 10 as a guide for assembly and insertion with the lower cover 5. Furthermore, the truncated conical 10 provided at the tip of the lower shaft of the guide bar 8 provides an effect of not damaging the lower cover 5 when it is hung together.

It is also possible to use a 7 Lances water turbine having a structure in which the tip of the guide vane lower shaft is shaped like a truncated cone to facilitate insertion of the lower cover into the guide vane bearing.

〔Effect of the invention〕

Francis turbines are conventionally installed in factories, etc. by staying,
The upper cover, guide bar 7, lower cover, etc. are temporarily assembled, disassembled, packaged and transported to the site, and the conventional assembly and disassembly method described above is performed again at the site. It can be seen that the effect is a reduction in the number of days and costs associated with recruitment.

- If the great invention is applied to man-made hydropower, the stay ring, upper cover, guide bar 7, lower cover, etc. can be delivered to the site as one piece as long as transportation conditions permit, so the runner main shaft can be assembled with minimal disassembly and assembly. In addition to reducing the number of days and costs, it is also effective in improving the quality of construction work.

[Brief explanation of drawings]

1 and 2 are partial cross-sectional views showing a method of assembling a Francis turbine according to an embodiment of the present invention. 1... U/S 2... Main shaft 3... Casing 4... Upper cover 5... Lower cover
6... Staying 7... Guide vane operating mechanism 8... Guide vane agent Patent attorney Nori Chika Nori Yudo Hirofumi Mitsumata Figure 1

Claims (1)

[Claims] During on-site assembly of Francis turbines, once the upper cover, guide vanes, and guide vane operating mechanism have been assembled, when removing the upper cover from the stay ring to assemble the runner and main shaft, the guide vanes and guides are removed from the upper cover. Remove the vane operating mechanism at the same time in a suspended state, install the runner main shaft, then simultaneously lower the mutually assembled upper cover, guide vanes, and guide vane operating mechanism, and place the upper cover on the stay ring; A Francis turbine assembly method characterized by assembling the guide vane lower shaft to the lower cover.