JPS60173301A - Turbine moving blade - Google Patents

Abstract

PURPOSE:To prevent erosion occurring at the tip part of a blade by fixing wear resisting metal at both a reinforcing cover part, which is installed at the tip portion of the blade, and a portion near the tip portion of the blade main body. CONSTITUTION:Ni-base alloy 5 and Co-base alloy 6 are welded in layer form on the steam inlet side of both a reinforcing cover part 3, which is installed at the tip portion of a blade 1, and a portion near the tip portion of the main body of the blade 1. Both the range in the lengthwise direction from the middle part of the cover part 3 to the position of lapping ''g'' over the end of the Co-base alloy 1a and the range in the depthwise direction from the bottom of the Co-base alloy 1a to the position ''f'' deep are built up by welding. After this building up, bevel angles are provided by machining so that the Co-base alloy 1a is fixed by silver brazing. With this contrivance, erosion at the tip part of the blade 1 can be prevented.

Description

Detailed Description of the Invention [Originally applicable field] The present invention relates to turbine purity, which is intended to completely prevent erosion of rotor blades during turbine operation, and particularly to the part of the cover on the steam inlet side and It is rounded to the turbine blade, which is suitable for preventing erosion near the tip of the blade.

[Background of the invention]

3. Turbine rotor blades are cylindrical pressure turbines. QQQ rpm is 3,600 r p”, low pressure turbine is 1,5
Because of the high-speed rotation noise of 00rPm to 1,800rpm, three-dimensional wet steam flow and transonic serial flow occur, and the dynamic environment is exposed to harsh environments and high stress conditions. . As shown in Fig. 1, the structure of 1dJx in its simple state is composed of a non-body 1, a tie wire 2 and a cover 3, and two lotions are placed at the tip of the non-body 1 on the air inlet side by the vapor flow. CO-based alloy plate la as a shield
has been established. Next, as shown in FIG.
Afterwards, it is formed on the rotor blades of the wheels.

FIG. 2 is a view of the grouping state as seen from the steam inlet side.

Since the rotor blades assembled in this manner are joined by the tie wires 2 and the cover 3, the rigidity is excellent. However, as shown in FIG. 3, the conventional erosion shield has a CO-based metal plate 1a4 welded 4 on the steam inlet side of the tip of the main body 1.
It has a simple structure. There are two methods for installing the shield: If the length is 33.5" or more, the true body 1 and the cutter (-3) are integrated and the CO-based metal plate 1a
'1 TIG welding is completed. Figure 4 is a diagram of Figure 3, and is an example of a view from a part of the cover of the TIG Yukon Taizo. On the other hand, for wings 1 of 33.5″ or larger, bodyless 1 and C
After joining the O base metal plate 1a by brazing, cover 3
In this case, the gap 33 between the X00 alloy plate 1a and the cover 3 is approximately 1.5 mm, but the structure is such that it is filled with silver solder. FIG. 5 is a cross-sectional view taken along the line V-v in FIG. 3, and is an example of a cross-section of a silver solder type blade. In this way, TIGI is used for the erosion shield & resultant force method.
There are two types: contact type and silver wire type. The former has excellent erosion resistance but is expensive to manufacture, so it is only applicable to long awns of 33.5" or more, and 26" and 23" of less than 33.5".
'' etc. are made of silver wax type.By the way,
During operation of this silver brazing type metal plate, a significant erosion portion 3a occurs from the cover 3 to the CO-based metal plate 1a, as shown in FIG. Figure 7 shows an example of the erosion situation.

The erosion depth d is the maximum value line 5. at the boundary between the cover and the CO-based metal plate 1a. Qmm""c, the cover that is not shielded with CO-based fluorescent board and the old silver wax on its border are subject to serious erosion. There is no drastic countermeasure against this kind of erosion until now, and we have replaced it with CO-based metal plate Tk support repair. In the first part of the shape structure, repeat B, CO base metal plate replacement and repair! Tatami increases the total production cost, which shortens the lifespan and causes deterioration in performance.

[Purpose of the invention]

It is an object of the present invention to provide a low operating cost turbine engine that prevents erosion and requires no maintenance.

[Overview of the invention]

The key point of the present invention is to completely fix the Nl-based alloy and the COO alloy to a portion of the cover and the steam inlet near the tip of the blade body.

[Embodiments of the invention]

Embodiments of the present invention will be described based on FIGS. 8 to 11.

FIG. 8 shows an example of the τ structure of the erosion prevention movement of the present invention. 9th
The figure is a sectional view taken along arrows 8--2. N1-based alloy 5 and CO-based alloy 6 are welded in layers on the steam inlet side of the heating tip,
As shown in Fig. 9, this welding range extends from the center of the cover 5 in the longitudinal direction to a position 3 mm into the wrap P of the CO-based metal plate 1a, and in the longitudinal direction it extends deeper than the paper part of the coho metal plate. Weld overlay on 1 up to the 7fil n+ position in the middle of the step.

In the width direction, as shown in FIG. 10, the width dimension range of the CO base metal 1a is overlaid. In the hot bath method, the welding area 10 is covered with N1-based alloy 5 to a thickness of about 3 mm, and then COO alloy 6 is overlaid up to the profile position. In order to prevent stress cracking, the overlay method is
This is done after overlaying the Jt contact CO base metal 6, overlaying the N1 base alloy 5 on the true body 1, and performing O.

The relationship between the hardness of each Yuzu material is 1. The relationship between the tensile strength of the silver wax N1 base alloy and the true body <COO alloy is as follows: The relationship of the tensile strength is between the silver wax N1 base alloy, the true body and the COO alloy. There is NI Karasugane alloy. From this mechanical property, it can be seen that in the present invention, the COO alloy is overlaid on the solid surface, and that it is appropriate to use the Nl-based alloy as the base layer of the CO2 alloy with no main body.

After overlaying Nl-based alloy and COO alloy, beveling is performed,
A part of the overlay part is attached to the second side of the gold fillet main body using silver solder 4a, but as shown in FIG. The built-up part is wrapped to prevent corrosion and is #I# construction.

FIG. 11 is a sectional view taken along line XI-XII in FIG. 8.

The area in question has the same cross-sectional structure as the conventional one, but the erosion is minimal and there are no problems.

(Effects of the Invention) According to the present invention, it is possible to prevent erosion, to easily replace and repair an erosion shield, and to produce a high-performance moving plate at a low cost.

[Brief explanation of the drawing]

Figure 1 shows the M of normal turbine movement. FIG. 2 is a diagram showing an example of the basic structure in a raised state, and FIG. 2 is a diagram showing a grouped state after the pilot wing of FIG. 1 is assembled. , Fig. 3 is an enlarged view of a part of Fig. 1 and shows the composition of the conventional moving plate, Fig. 4 is a view from the IV arrow in Fig. 3, and Fig. 5 is a view from the V-■ arrow in Fig. 3. A cross-sectional view, FIG. 6 is a diagram showing an example of eroded mX, and FIG. 7 is a graph for explaining the erosion situation. 8 to 11 show one embodiment of the present invention, FIG. 8 is a diagram showing the moving plate structure of this embodiment in a part of FIG. 1, and FIG. ■A sectional view taken along the arrows, Figure 10 is a sectional view taken along the X-X arrow in Figure 8, and 11
The figure is a sectional view of FIG. 8. 1... Challenging book, 1a-CO base alloy plate, 2... tie wire, 3... cover, 3a... cap, 3b... eroded part, 4... welding, 4a-Kushiro 9.5... N1-based alloy, 6.
・L-Li Condolence 7-1'3-7P Power lla Continued from page 1 0 Inventor Hisashi Kita 3-chome, Saiwai-cho, Hitachi City @ Inventor Ittsu Aoki Department, 3-chome, Saiwai-cho, Hitachi City @ Inventor Sasa 1) Tetsuo 3-1 Saiwaimachi, Hitachi City

Claims (1)

[Claims] 1. A turbine with a cover #aJx in which a reinforcing cover is provided at the JK tip, characterized in that wear-resistant gold is solidified on a portion of the cover and near the tip S of the bodyless body. Turbine purity. In claim 1, N1-based alloy and Co#5 are added to a part of the cover and the air inlet near the tip of the non-main body.
The turbine 1tJJKo is characterized by a solid layer of Ajaku. 3. In the second claim, 002 & alloy plate is pasted on the surface of the alloy ramming part +! : A turbine rotor blade characterized by: