JPH0249450B2 - JOKITAABINBOSHOKUSEKOBUNORIIKUKENSAHOHO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a leak inspection method for a corrosion-protected portion of a steam turbine.

Generally, nuclear power turbines, thermal power generation turbines,
In marine turbines, geothermal turbines, steam-driven compressors, and other types of turbines, steam, water, etc. In order to prevent corrosion due to the intrusion or passage of impurities in mist or steam, these gaps are filled with organic resin to prevent corrosion.

This situation will be explained with reference to FIGS. 1 and 2.

That is, the gap formed between the Rota 1 and the baked daysque 2, the gap 4, 4B, the blade wing root 11 and the Rotor Daisk wing planting formed in the gap 4, the rotor 1, the baked diesk 2 and the key 3. The gap 13 formed between the gap 12 and the groove 12 is filled with liquid organic resin 5 having good fluidity by applying pressure or vacuum suction.

As the liquid organic resin 5, for example, a self-curing unsaturated polyester resin, an anaerobically-curing polyester acrylic resin, etc. are used, and these resins have a low shrinkage rate and a high adhesive strength to steel materials when hardened.

After filling the above gap with organic resin and curing, it is necessary to check the filling status of the organic resin and refill any areas where the filling is insufficient.However, the conventional leak detection method is to insert a feeler gauge. It will be done.

However, the above-mentioned leakage testing method using a feeler gauge has the drawback of poor testing accuracy and requiring a long time for testing.

The present invention improves the conventional inspection method described above, and uses steam that is easy to operate, has high inspection accuracy, can be inspected in a short time, and does not cause problems when refilling (deterioration of adhesive strength, insufficient curing, etc.). The purpose of the present invention is to provide a leak inspection method for a corrosion-protected part of a turbine.

In order to achieve the above object, the present invention provides an inlet side adapter on one side and an outlet side adapter on the other end in close contact with each other so as to cover the end faces sandwiching the organic resin filling part of the gap from the outside. The apparatus is configured to introduce pressurized gas from the inlet side adapter side, guide the gas leaking to the outlet side adapter into water, and inspect the state of leakage from the organic resin filled part.

INDUSTRIAL APPLICATION This invention can be widely applied to the leak detection of various gap filling parts.

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

In FIGS. 3 and 4, members having the same reference numerals as those in FIGS. 1 and 2 have substantially the same functions and effects, so their explanations will be omitted.

Reference numeral 14 denotes an inlet side adapter (for example, made of soft rubber and formed in a U-shaped cross section, with an opening) which is closely fitted so as to cover one side of the end face of the rotor disk from the outside, sandwiching the organic resin filled part. 15 is an additional gas supply means (for example, an air gun) whose gas supply side is connected to the inlet side adapter 14, and 16 is a gas supply means connected to the suction side of the gas supply means 15. A tube (for example, factory air, a rubber tube with an air pressure of 5 kg/cm ² ). The gas used may be air, nitrogen, or other inert gas.

Reference numeral 17 denotes an organic resin filling portion, for example, an outlet adapter (similar to the outlet adapter 14) that is closely opposed to the inlet adapter 14 so as to cover the other side of the end face of the rotor disk from the outside;
18 is a connecting pipe (for example, a 5 mm diameter polyethylene tube) connected on one side to the outlet adapter 17; 19 is a container (for example, a 100 ml transparent polyethylene bottle) into which the other side of the connecting tube 18 is inserted;
Reference numeral 20 denotes water contained in the container 19, which is inserted through the communication pipe 18 so that the other side thereof opens into the water. With such a configuration of the device, if air is ejected by pulling the trigger of the pressurized gas supply means 14, for example, an air gun, and air bubbles are generated on the water 20 in the container 19, it is determined that there is a leak.

Test examples according to the method of the present invention will be explained below.

(A) Test example 1 in a steam turbine After filling the gap 13 shown in FIG. 2 with, for example, a self-curing unsaturated polyester resin (viscosity 4 poise) as the organic resin 5 by a vacuum suction method,
Self-curing.

The next day, a leak test was performed using the test method shown in FIG. 3, and as a result, leaks were detected at six locations. After refilling, we conducted a leak test and found that
It wasn't discovered.

The conventional method of inserting a feeler gauge took 40 hours to inspect with 480 inspection blades. The method of the present invention completed the test in 8 hours, significantly shortening the test time.

(B) Test Example 2 in a Steam Turbine The gap 4 shown in FIG. 1 was filled with, for example, an anaerobic hardened polyester acrylic resin as the organic resin 5 by a vacuum suction method. Thereafter, both ends were sealed with liquid silicone rubber, air was shut off, and the product was cured.

Next, the silicone rubber at both ends was peeled off, and a leak test was performed using the test method shown in FIG. 3. As a result, no leak was detected.

The present invention achieves the following effects by employing the above-described inspection method.

(1) The method of the present invention involves placing an inlet side adapter and an outlet side adapter in close contact with each other so as to enclose the filled part on both sides of the hardened organic resin filled part of a steam turbine, etc., and then Pressurized gas is introduced from the adapter and the gas leaking to the outlet side adapter is guided into the water so that the leakage situation from the organic resin filled part can be known.

Therefore, compared to conventional methods, this method has the advantage of being easier to operate, having higher accuracy, and significantly shortening the inspection time.

(2) Since air, nitrogen, inert gas, etc. are used as feed gas for inspection, leaks are detected and
Even when refilling with organic resin, there is an advantage that no problems such as a decrease in adhesive strength or poor curing of the resin occur.

[Brief explanation of drawings]

Figure 1 is a partial cross-sectional view showing the state in which organic resin is filled into the gap formed between the steam turbine rotor and the shrink-fit disk, and Figure 2 is a partial cross-sectional view showing the steam turbine rotor disk blade implant and blade root. FIG. 3 is a schematic diagram showing an embodiment of the method of the present invention;
FIG. 4 is a front view showing how the inlet side adapter is attached. 1...rotor, 2...shrink fit disk, 3...
...Key, 4, 4a, 4b...Gap, 5...Organic resin, 11...Blade root, 12...Rotor disk blade embedded part, 13...Gap, 14...Inlet side adapter, 15... ...Pressurized gas supply means, 16...
... Gas pipe, 17 ... Outlet side adapter, 18 ... Connection pipe, 19 ... Container, 20 ... Water.

Claims (1)

[Claims] 1 After filling and hardening an organic resin into the gap formed between the steam turbine rotor and the shrink-fit disk and/or the gap between the rotor disk blade implant and the blade root, the organic resin is An inlet side adapter is placed on one side and an outlet side adapter is placed on the other side facing each other in close contact so as to cover the end faces sandwiching the filling part from the outside, and pressurized gas is introduced from the inlet side adapter side. A leak inspection method for a corrosion-protected part of a steam turbine, comprising guiding gas leaking to an outlet side adapter into water and inspecting a leakage situation from a part filled with the organic resin.