JPS628633B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for disassembling and assembling a multi-stage vertical shaft water turbine, etc., and a conveying device, and in particular, to a method for disassembling and assembling a multi-stage vertical shaft water turbine, etc.
A method for disassembling and assembling multi-stage vertical shaft water turbines, etc., which is useful when the lower cover and auxiliary equipment cannot be removed from the lower part of the water turbine as an annular unit due to the presence of an undisassembleable main shaft, etc., and transportation directly used to carry out this method. Regarding equipment.

Generally, in single-stage vertical shaft water turbines, the runner is attached to the tip of the main shaft, but in multi-stage vertical pump turbines, the lower end of the main shaft is further suspended from the installation position of the lowest runner in order to suppress the vibration of the lowest runner. let me,
Some have a structure in which they are inserted into the lower suction pipe and are pivotally supported. Further, in a multi-stage vertical pump water turbine, a lower guide vane operating mechanism is attached to the lower cover, and an operating mechanism chamber for accommodating the mechanism is formed around the suction pipe.

Conventionally, when disassembling a multi-stage vertical pump water turbine with such a structure, especially when removing ancillary equipment such as the lower cover and guide vane operating mechanism,
Because of the presence of the main shaft that cannot be disassembled, it is impossible to carry the lower cover in its annular integral structure outside the operation mechanism chamber and disassemble it. Therefore, the lower cover, guide ring, etc. are divided into two or four parts in the circumferential direction, and can be disassembled or assembled into individual parts.

However, disassembling and reassembling the lower cover into separate parts has the problem that it is very difficult to center the lower cover during assembly, resulting in poor workability and poor alignment with the water turbine body. Moreover, it is impossible to disassemble each divided body because the structure is such that the bolts of the flange joint cannot be removed from the outside.
As a result, it is impossible to disassemble and reassemble only the lower cover and its ancillary equipment, which is disadvantageous unless the water turbine itself is disassembled.

The present invention has focused on the above-mentioned problems, and when disassembling and assembling the lower cover of a multi-stage vertical shaft water turbine and its ancillary equipment, the lower cover etc. are constructed in an annular integral structure with parts that cannot be disassembled or do not need to be disassembled. Disassembly and assembly of multi-stage vertical shaft water turbines, etc. that makes it possible to easily disassemble and assemble the annular integral structure around the main shaft, and to carry it in and out even when it is not possible to carry it in and out. It is an object of the present invention to provide a method and a conveying device.

Embodiments of a method for disassembling and assembling a multi-stage vertical water turbine and a conveying device according to the present invention will be described below in detail with reference to the drawings.

Figure 1 shows a cross-sectional view of a two-stage vertical pump turbine. As shown in this figure, the pump turbine is equipped with two stages of upper and lower runners 10 and 12.
The water is introduced to the upper runner 10 through the casing 14 provided at the inlet of the
It has a flow path that leads water from the lower runner 12 to the suction pipe 18. The main shaft 20 of this water turbine is fitted with upper and lower runners 10 and 12, and its lower part is extended further downward from the lower runner 12, and the suction pipe 1
The lower end is supported by a bearing or the like (not shown) while being inserted into the center of the lower runner 8, thereby suppressing vibrations caused by rotation of the lower runner 12.

Below the pump-turbine, a lower operating mechanism chamber 26 that surrounds the suction pipe 18, faces a lower cover 22 of the pump-turbine, and accommodates a guide vane operating mechanism 24 of the lower-stage water turbine device is formed of a concrete frame. It is done.

In such a multi-stage vertical pump water turbine, the lower cover 22 and the guide ring 28 of the guide vane operating mechanism 24 provided on the lower cover 22 have an annular integral structure and can be removed from the main body and transported as a disassembly means. equipment is provided. That is, an annular rail 30 is laid on the floor of the operating mechanism room 26 around the suction pipe 18 and directly below the lower cover 22, and four divided arcuate carts 32 can run on this annular rail 30. It is provided. When these divided arcuate trucks 32 are on the annular rail 30, four of them form an annular truck 34 that completely surrounds the suction pipe 18. Five wheels 36 are attached to the lower surface of each segmented circular arc truck 32, and the truck 32
Three pieces are attached to the outer circumference side and two pieces are attached to the inner circumference side. Therefore, the annular rail 30 can be run using two wheels 36 on the inner rail and three wheels 36 on the outer rail. As shown in FIG. 3, the wheels 36 are rotatably attached to the truck 32 by a bracket 38 to which the wheels 36 are attached.

Further, a linear pull-out rail 40 extending to the outside of the operating mechanism chamber 26 is connected to the annular rail 30. This pull-out rail 40 is laid symmetrically as a set of three straight rails, and one set corresponds to one segmented arc rail 32, and the segmented arc bogie 3
When one end edge of the joint surface of 2 and the other bogie 32 is parallel to the straight rail, the wheels 36 can roll onto the respective lane rails.

Note that 31 in the figure is an auxiliary annular rail located on the outer periphery of the annular rail 30 (FIG. 1).

The method for disassembling and assembling the lower cover and the like using the transport device configured as described above is as follows. That is, the suction pipe 18 is placed on the annular track 30 in advance.
An annular truck 34 is arranged so as to surround the.
Then, the lower cover 22 is taken out from the water turbine body with the guide vane operating mechanism 24 attached. At this time, since the lower cover 22 is bolted from the operating mechanism chamber 26 side of the letter guide 16, the annular integral structure can be removed. This lower cover 22 is suspended and placed on an annular truck 34 while maintaining its annular shape, and on the truck 34, the lower cover 22 is divided into two or four parts in the circumferential direction. For this division, the annular truck 34 is positioned in advance so that the dividing line of the annular truck 34 and the dividing line of the lower cover 22 coincide. When dividing the lower cover 22, the guide vane operating mechanism 24, which was removed at the same time, may be similarly disassembled at the dividing line position and placed on the annular carriage 34. Thereafter, the annular bogie 34 is run as appropriate, one division line of the bogie 34 is arranged parallel to the lead-out rail 40, and the segmented arcuate bogie 32 is levitated to a slight height by the jack 42 (see Fig. 3), and the wheels 36 is rotated and brought into contact with the pull-out rail 40, and the divided products are transported to the outside.

Conversely, when assembling the lower cover 22,
The guide vane operating mechanism 24 is moved along the pull-out rail 40 with a divided arcuate truck 32 for each divided product, and when it reaches the branching point with the annular rail 30, the cart 32 is levitated with the jack 42 and attached to the annular rail 30. wheel 36
An annular carriage 34 is constructed by having four carriages 32 while making contact with each other. Thereafter, the divided parts are assembled, and the lower cover 22, guide ring 28, etc. are lifted up as an annular integral structure and assembled into the water turbine main body.

According to the disassembly and assembly method and conveyance device configured in this way, even if there is a main shaft 20 that cannot be disassembled, the annular integral structure can be temporarily removed and placed. Since it can be assembled, alignment of each divided product can be maintained reliably, and centering can be easily performed. In addition, carrying in and out of the operation mechanism chamber 26 can be extremely easily carried out by running the individual segmented arcuate carts 32, and the segmented products can be transported without disassembling the suction pipe 18.

In addition, when assembling the lower cover 22, from the viewpoint of workability in inserting bolts and attaching gaskets at the split surface, even if the product is divided into four parts, it is assembled in advance into two semicircular parts, and then this is further divided into a circular shape. It is common to find a way to assemble it in a ring. For this reason,
The pull-out rails 40 consisting of three straight rails are laid symmetrically so that it can be carried in in two divided states. Therefore, if the lower cover 22 is a two-piece product, both drawer rails 40 are used, and if the lower cover 22 is a four-piece piece, either the left or right drawer rail 40 is used.

As described above, according to the present invention, when a multi-stage vertical shaft water turbine has a guide vane operating mechanism etc. at the bottom, an operating mechanism including the guide vanes such as a lower cover and a guide ring related thereto is attached. This has the effect of making it easy to assemble and disassemble the device, and to carry it in and out accordingly.

[Brief explanation of the drawing]

Figure 1 is a partially omitted sectional view of a multi-stage vertical pump turbine, Figure 2 is a plan view showing the positional relationship between the rails laid on the floor of the operating mechanism room and the truck, and Figure 3 is a partial sectional view of the truck. be. 10... Upper runner, 12... Lower runner, 1
8... Suction pipe, 20... Main shaft, 22... Lower cover, 24... Guide vane operating mechanism, 26... Operating mechanism chamber, 30... Annular rail, 32... Segmented arc truck, 34... Annular truck , 40... Pull-out rail.

Claims (1)

[Scope of Claims] 1. The lower cover to which the guide vane operating mechanism of a multi-stage vertical shaft water turbine or the like is attached is removed in an annular form inside the lower operating mechanism room, and the annular rail laid on the floor of the lower operating mechanism room is removed. The lower cover, etc. is disassembled in the circumferential direction on the trolley, and then separated from the pull-out rail connected to the annular rail. A method for disassembling and assembling a multi-stage vertical water turbine, etc., characterized in that each item is transported out or assembled by the reverse process described above. 2. An annular rail laid in the circumferential direction of the suction pipe at a position directly below the lower cover on the floor of the lower operation mechanism room facing the guide vane operation mechanism attached to the lower cover of the multi-stage vertical shaft water turbine, etc.; An annular truck that can run on an annular rail and is divided into a plurality of parts in the circumferential direction, and a pull-out rail that is connected to the annular rail and led out of the lower operating mechanism chamber so that each of the divided carts can run and move. Disassembly, assembly and transportation equipment for multi-stage vertical water turbines, etc.