JPS62284902A - Joining method for connection plate damper - Google Patents

Abstract

PURPOSE:To facilitate mounting and demounting of a connection plate damper, by a method wherein plural connection plate dampers, each having opening parts for inserting a tenon and a stepped part at the end part of the opening, are combined together in a reverse direction to each other, and the end part of each opening part is folded to secure the end parts by means of a ring. CONSTITUTION:A connection plate damper 1 is inserted in a gap between a blade 14 and a shroud 3, and is locked to a tenon 6 of the blade 14. In this case, two connection plate dampers 1a and 1b, each of which is formed such that it has opening parts 2 for inserting the tenon 6 and a stepped part 4 at the reverse end of the opening part 2, are combined together in a reverse direction to each other to form the connection plate damper 1. End parts 1A and 1B of the opening are folded, and a ring 5 is secured to the end parts 1A and 1B of the opening so that the opening part 2 is prevented from expansion due to a centrifugal force. This connection facilitates mounting and demounting of the connection plate damper 1, eliminates the need to replace the blades 14 throughout the whole periphery, and enables reduction of a repair expense.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an improved method of joining a connecting plate damper inserted into a gap between a blade at the tip of a turbine rotor blade and a shroud. It is something.

[Conventional technology]

In conventional turbines, as shown in FIGS. 9 to 13, a connecting plate damper 01 is installed in the gap between the tip of the blade 04 of the turbine rotor blade and the shroud 03. A tenon 02 is provided protruding from the blade 02, and a plurality of blades 04 are bound by a single shroud 03, and the connection plate damper 01 is for connecting the blades 04 at the ends of adjacent blades. For installation, the two tenon insertion holes 06 provided in the connecting plate damper 01 are inserted into the tenons 02 of both adjacent blades 04, and after placing the shroud 03 on each of the blades,
This is done by caulking the head of the Tenon 02. The installation of the connecting plate damper 01 has advantages such as a damping effect due to relative sliding with the shroud 03, maintaining vibration characteristics of the infinite blade group by connecting the blades all around, and reducing dangerous resonance points. However, since the conventional connecting plate damper 01 described above is attached to the head of the Tenon 02, once it is attached, it cannot be removed. Therefore, if even one of the connecting plate dampers 01 is damaged, the Tenon 02 It is necessary to replace all the blades 04 that are integrated with the blades with new ones, and the cost in that case is unavoidable.

[Departure! [Problems that the company is trying to solve]

An object of the present invention is to replace only the connecting plate damper 01 (= in case of damage, etc.) so that it is not necessary to replace all the blades 04.

Means for Solving Problem c] The present invention provides two plates having a tenon insertion opening and a step-shaped abutting portion, which are inserted from opposite directions so that their outer shapes match. After stacking and inserting, both ends are bent, a reinforcing ring is attached to the bent part, and it can be fixed by means such as welding (two-way fixation), making it possible to secure the same effect and strength as conventional connecting plate dampers. It has a structure.

In addition, by removing fixed points such as welded parts or bent rings, the structure can be removed in the opposite direction.

[For production]

That is, the connecting plate damper according to the present invention can be installed in exactly the same manner as conventional dampers, and when replacing the connecting plate damper, by removing the joint part, the side (=
It can be easily done by pulling it out, then inserting a new damper from the side and rejoining it, and there is no need to replace all the blades.

〔Example〕

Next, an explanation will be given of one embodiment of the present invention. Then, in FIG. 1 and FIG. The two connection plate dampers la and 1b shown in FIGS. 2 and 3, which are formed to have a stepped portion 4 at the opposite end, are arranged in an inverted five-way shape (the two combined opening ends IA and IB are bent, Furthermore, in order to prevent the opening 2 from expanding due to centrifugal force, the shaft 5 shown in FIG. It is possible to reproduce the effect and intensity.

The thickness of the stepped part 4 is the sum of the plate thickness of the opening insertion part:
Form. That is, if the thickness of the stepped portion 4 is made the same as the thickness of the overlapping partner plate, the contact area with the tenon 5 will increase, contributing to damping of vibrations.

Connection plate damper 1.1a1b made in this way C:lII
As shown in FIGS. 4 and 5, the insertion can be carried out in the same manner as in the conventional connection plate damper described above.

In addition, in the event that these connecting plate dampers 1.1a and 1b are damaged and it becomes necessary to remove them, the ring 5, the welded part, or the open end I
By removing the fixing parts such as the bent parts A and IB, it can be pulled out laterally, and it can also be inserted and attached by inserting and fixing from the side. In the figure, 3 indicates a shroud, I4 indicates a blade, and 6 indicates a tenon.

〔Effect of the invention〕

As mentioned above, the present invention has excellent vibration resistance and strength (= many advantages) The connection plate damper can be installed and removed very easily, and repairs can be easily carried out, so there is no need to replace the entire circumference of the blade. , it is possible to realize a significant reduction in repair costs, and it can also be applied to existing blades, so its reliability can be significantly improved.

Additionally, the damping effect can be dramatically improved compared to conventional ones.

Furthermore, in the unlikely event that the vibration characteristics of the infinite blade group are lost due to an accident in which the connecting plate damper flies off, the phase stability (= the all-circumference connected infinite blade group structure during the rotational photographic test before delivery of the actual aircraft, Comprehensive reliability confirmation by conducting various tests such as a semi-infinite blade group structure in which two or three connecting plate dampers have been removed, and a finite blade group structure in which all connecting plate dampers have been removed, is also possible according to the present invention (application of the second related connecting plate damper). The practical benefits of the present invention are wide-ranging, such as being extremely easy and reliable, and will greatly contribute to the development of industry.

[Brief explanation of the drawing]

FIGS. 1 to 8 are diagrams showing one embodiment of this barking,
Fig. 1 is a perspective view showing the main parts of one embodiment of the present invention;
3 and 3 are plan views showing an example of a pair of connecting plate dampers according to the second embodiment of the present invention. FIG. Fourth
Figure 6 is a side view of the ring, Figure 7 is a view taken along the line v-V in the figure, and Figure 7 is a side view of the ring.
Similarly, FIG. 8 is a longitudinal sectional view of the main part showing a state in which the connecting plate damper is installed in the gap between the blade and the shroud, and FIG. 8 is a plan view of FIG. 7 showing the main part similarly viewed from the top surface of the shroud. Figures 9 to 13 are diagrams showing conventional examples; Figure 9 is a front view of the main parts of the conventional connection plate damper; A vertical side view and a plan view, and FIGS. 12 and 13 are a plan view and a side view of a conventional connecting plate damper.

Claims (1)

[Claims] In a connecting plate damper inserted into a gap between a blade at a tip of a turbine rotor blade and a shroud and locked to a tenon of the blade, an opening opens laterally from a deep part of the connecting plate damper to lock to the tenon of the blade. The tenon insertion opening and the connection plate damper having a stepped portion at the upper end of the tenon insertion opening are overlapped in opposite directions, and the overlapping connection damper opening end is bent to form the bent opening end. A method for joining a connecting plate damper characterized by joining rings.