JPS5833474B2 - Expansion joint mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to a mounting device for an expansion joint used in a condenser or other heat exchanger having similar functions.

As shown in FIG. 1, the conventional expansion joint 3 of this type is connected at both ends to the turbine casing 1 and the condenser body 4 installed on the turbine foundation 11, respectively, and is connected to the turbine casing 1 installed on the turbine foundation 11 and to the condenser body 4. Its function is to absorb thermal expansion and prevent deformation of equipment.

A turbine rotor 2 is housed within the turbine 1, while a cooling water inlet chamber 6, an outlet chamber 7, and a cooling pipe 8 attached to a tube plate 5 are housed within the condenser body 4.

After the steam 11a supplied by a boiler or the like drives the turbine rotor 2 and performs work, it flows around the cooling pipe 8 in the condenser body 4, and heats up with the cooling water 12 flowing inside the cooling pipe 8. The exchanged water becomes condensate 13, which is fed as feed water to the boiler via the condensate pipe 9 by the condensate pump 10.

The above-mentioned condenser, especially the condenser of a low vessel (75KW or less) turbine, uses an expansion joint as shown in FIG.

In other words, in a condenser that has a small amount of expansion and contraction in the vertical and lateral directions due to thermal expansion during turbine operation, its body 4
The turbine casing 1 and the turbine casing 1 are connected by a rust-proof steel expansion joint 15 via a seal weld 14 .

If such an expansion joint 15 is used in a condenser of a large capacity (over 75') turbine, it will not be possible to accommodate the required amount of expansion and contraction.

For this reason, in the condenser of a large-capacity turbine, a rubber belt expansion joint 16 as shown in FIG. 3 is used, and one end 16a of the joint 16 is provided with an arcuate groove 21a in the turbine casing 1 and the presser plate 17, respectively.

21b, a fitting 20 is interposed between the turbine casing 1 and the holding plate 17, and the tightening bolt 1
8 and nuts 19 to tighten the presser plate 17 and integrally connect it to the turbine casing 1.

In the same way, the other end 16b of the expansion joint 16 is also attached to the presser plate 1.
It is integrally connected to the condenser body 4 by 7.

In such a structure, it is difficult to press the parts in parallel considering the manufacturing error of each part, so the presser plate 17 is always inclined by the amount of inclination γ and the ends 16a, 16 of the expansion joint 16 are
Since b is pressed, the tightening force f acts partially concentrated as shown in the figure.

For this reason, the expansion joint 16 is tightened in a deformed state, and there is a possibility that the expansion joint 16 cannot be attached with uniform compressive force.

Therefore, this not only shortens the life of the expansion joint 16 but also hinders the normal operation of the turbine generator.

Furthermore, since the presser plate 17 is tightened with the nut 19 while controlling the torque during assembly, not only is it impossible to change the tightening force evenly, but also a large number of man-hours are required.

In view of the above, it is an object of the present invention to provide a mounting device for an expansion joint that applies tightening force and is easy to assemble and adjust. Adjustment bolts are provided on both sides of the tightening bolts that tighten the holding plates to press against the body, or on the opposite side of the expansion joint, and these adjustment bolts adjust the tightening distance between the turbine casing and condenser body and the holding plates. It was designed to do so.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 4, 1 is a turbine casing having an arcuate groove 2a, 4 is a condenser body having an arcuate groove 21b, 16 is a rubber belt expansion joint with spherical portions 16a at both ends,
17 is a presser plate having an arcuate groove 21b, 18 is a presser plate 17
A tightening bolt 19 is screwed into the turbine casing through a nut screwed into the tightening bolt 18;
2 is an adjustment bolt attached to the holding plate 17 on both sides of the tightening bolt 18, and 23 is a lock nut screwed into the cooking bolt 22.

When assembling this embodiment having the above structure, first insert both spherical parts 16a of the expansion joint 16 into the arc grooves 21a of the turbine casing and the condenser body 4, and then insert the arc grooves 21b of each holding plate 17. are engaged with the spherical surface portion 16a, each holding plate 17 is attached to the turbine casing 1 and the condenser body 4 using the tightening bolts 18 and nuts 19, and the spherical surface portion 16a of the expansion joint 16 is tightened.

In this case, the distance T' between the turbine casing and condenser body 4 and the holding plate 17 is T-T' of the expansion joint 16.
This value is set to 0φ, and the distance T' can be easily adjusted using the adjustment bolt 22.

After adjusting the interval T' in this way, the adjustment bolt 22 is fixed with the lock nut 23.

In this embodiment, since the adjustment bolt 22 and the lock nut 23 are provided on both sides of the tightening bolt 18, the compressive force f applied to the expansion joint 16 can be applied uniformly over the entire joint.

Instead of providing the adjusting bolts 22 on both sides of the tightening bolt 18 as in the above embodiment, as shown in FIG.
2 may be provided only on the side opposite to the telescopic joint of the tightening bolt 18, and the lock nut 23 may be screwed into the adjustment bolt 22.

In such a structure, in order to apply a uniform compressive force f to the expansion joint 16, that is, to always maintain a constant interval T', when tightening the presser plate 17 with the tightening bolts 18 and nuts 19, the tightening must be It is necessary to tighten while controlling the force.

As explained above, according to the present invention, it is possible to equalize the compressive force of the attachment portion at the end of the expansion joint, thereby extending the life of the expansion joint and preventing troubles during operation.

In addition, the distance between the turbine casing, condenser body, and retaining plate can be adjusted extremely easily, and at the same time, the retaining plate can be tightened with a specified tightening force, making it possible to tighten the retaining plate on-site. The assembly man-hours can be significantly reduced.

[Brief explanation of drawings]

Figure 1 is a schematic system diagram of a steam turbine, Figures 2 and 3 are
The figure is a sectional view showing a conventional expansion joint mounting device, and FIGS. 4 and 5 are sectional views showing the expansion joint mounting device of the present invention. 1... Turbine casing, 4... Condenser body, 1
6... Rubber belt expansion joint, 17... Holding plate,
18...Tightening bolt, 22...Adjustment bolt.

Claims (1)

[Claims] 1. In a mounting device in which one end of an expansion joint is connected to the turbine casing and the other end to the condenser body via a holding plate and a tightening bolt, adjustment bolts are installed on both sides of the tightening bolt or on the side opposite to the expansion joint. A mounting device for a telescopic joint, characterized in that the adjustment bolt is used to adjust the tightening interval between the turbine casing, the condenser body, and the holding plate.