JPS6114796Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a lubricating oil system protection device for rotating machinery.

Now, let us take a steam turbine as a typical example of a rotating machine and explain its typical lubricating oil system as shown in Figure 1. The lubricating oil stored in the oil tank 1 is sucked up by the suction pipe 2 and the oil supply pump 3 and pressurized to become a pressure oil of 1.0 to 2.0 Kg/cm ² g, which is then cooled by heat exchange with the cooling water line 6 in the oil cooler 5. , after being temperature controlled, the individual bearings 7 are passed through the oil supply pipe 4.
Branch supply is provided to. The waste oil used in the bearing 7 is discharged into the bearing pedestal 8 and flows down into the oil drain pipe 9 toward the oil tank 1 without losing pressure. On the other hand, an oil drainer 11 is installed at a portion where the rotor 10 supported by the bearing 7 passes through the bearing pedestal 8 and exits to the outside. The structure is such that it does not escape to the outside. The gas extractor 12 installed in the oil tank 1 also has the same purpose.
Its capacity is set so that the pressure inside the oil tank 1 is slightly negative with respect to atmospheric pressure. Since the oil drain pipe 9 communicates the bearing stand 8 and the oil tank 1, this negative pressure causes the inside of the bearing 8 to also become negative pressure.
A small gap is provided between the rotor 10 and the oil drain 11 to prevent contact, but the gas extractor 12
The air outside the bearing stand 8 will be sucked in through this gap. As a result, the oil inside the bearing stand 8 is
This means that the oil does not come out beyond the oil drain 11.

FIG. 2 is a typical cross-sectional view at right angles to the axis of the oil drain pipe 9 that incorporates the oil supply pipe 4, and the cross-sectional area of the oil drain pipe 9 is determined so that the drain oil occupies about 50% of the area inside the pipe. , the remaining space S is for the bearing stand 8 and the oil tank 1.
The air outside the bearing stand 8 flows through this space S to the oil tank 1 and is discharged from the gas extractor 12.
However, according to recent operating experience with geothermal turbines, although the internal space S of the oil drain pipe 9 in Fig. 2 is filled with oil mist, rust occurs in parts that are not in direct contact with the drain oil. However, a phenomenon has been observed in which these substances flow down into the oil tank 1. This is because geothermal turbines are often installed in volcanic areas and are in an atmosphere containing corrosive gases such as hydrogen sulfide. It was concluded that this was due to corrosion and rusting. If this phenomenon is left as it is, not only will the oil drain pipe 9 be thinned due to rust, but the rust will be included in the drained oil and return to the oil tank 1, accelerating the deterioration of the oil and causing the lubricating oil to deteriorate. There is also a risk of damaging various devices belonging to the system.

In view of the above points, the present invention provides a lubricating oil system protection device for rotating machinery that effectively prevents corrosion and rust of the oil drain pipe by providing a device that sprays oil at necessary locations on the inner surface of the oil drain pipe. is intended to provide.

A feature of the present invention is that a spraying device is provided in the oil drain pipe to spray lubricating oil onto the inner surface of the oil drain pipe to form a rust-preventive coating. An embodiment of the present invention will be described below with reference to the drawings. Note that parts having the same functions as those in FIG. 1 or FIG. 2 are designated by the same reference numerals, and explanations thereof will be omitted.

The spraying device shown in Figures 3 and 4 is
This is an example of a configuration in which through-holes 13 are provided at regular intervals in the oil supply pipe 4 installed inside the oil drain pipe 9 shown in the figure. By spraying it on the inside, it forms an anti-rust coating. The position of the through hole 13 may be limited to a location where the flow of drained oil is completely separated from the space S, depending on the route and shape of the piping, and it is not necessarily necessary to provide it over the entire length of the oil supply pipe 4. In addition, through hole 13
There is no need to limit the shape itself here.

The spraying device shown in FIG. 5 is separate from the oil supply pipe 4 in FIGS. 3 and 4, and is branched from the outlet of the oil supply pump 3 via an orifice 14, as partially shown in FIG. This is an example in which a supply pipe 15 is attached, and has the advantage that the amount of oil sprayed by the orifice 14 can be controlled.

Oil can be supplied to the supply pipe 15 in FIG. 5 by providing a pump 16 separate from the oil pump 3 of the main system, as shown in FIG. 7, and by doing so, It becomes possible to control the oil amount more accurately and completely eliminate any influence on the main system.
In this case, in Fig. 1, a tank (not shown) is used to temporarily store waste oil discharged inside the bearing stand 8.
It is also possible to provide oil to the supply pipe 15 using gravity.

In addition, in FIG. 1, the oil supply pipe 4 and the oil drain pipe 9 may be installed completely independently, but in such a case, the oil supply pipe 4 in FIGS. By replacing the supply pipe 15 with the supply pipe 15, the present invention can be applied as is.

As explained above, according to the present invention, the inner surface of the oil drain pipe is completely rust- and corrosion-proofed by spraying oil, which not only prevents thinning of the pipe, but also prevents the various devices that make up the lubricating oil system. This has a great effect on improving reliability. This is extremely effective not only for geothermal steam turbines, but also for various rotating equipment operated in corrosive atmospheres and reliable equipment that requires long-term operation.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the lubricating oil system of a steam turbine, Fig. 2 is a sectional view showing the inside of the oil drain pipe in Fig. 1, and Fig. 3 is an implementation of the lubricating oil system protection device for rotating machinery according to the present invention. FIG. 4 is a sectional view taken along the line - in FIG. 3, FIGS. 5 and 6 are sectional views and system diagrams showing other embodiments of the present invention, and FIG. FIG. 3 is a system diagram showing another embodiment of the invention. 1...Oil tank, 4...Oil supply pipe, 7...Bearing,
9... Oil drain pipe, 13... Through hole, 14... Orifice, 15... Supply pipe.

Claims (1)

[Scope of utility model registration request] The lubricating oil extracted from the oil tank via the oil pump is fed to the bearing through the oil supply pipe, and the waste oil extending inside the bearing and released from there is collected into the oil tank through the oil drain pipe, and then In a lubricating oil system for a rotating machine in which almost the entire area of the oil supply pipe is accommodated in the oil drain pipe so as to isolate the lubricating oil from the outside area during circulation of the lubricating oil, the lubricating oil is contained in the oil drain pipe. 1. A lubricating oil system protection device for a rotating machine, comprising a spraying device that sprays the oil into an oil drain pipe to form a rust-preventing film.