JP3005775B2 - Cleaning method of bearing lubricating oil piping system of rotating machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a bearing lubricating oil piping system of a rotating machine, and more particularly to the above-mentioned method for reducing the time and labor required for cleaning.

[0002]

2. Description of the Related Art An oil supply pipe for supplying lubricating oil, a control oil pipe (not shown), and a discharge pipe are provided on bearings of a rotating machine such as a pump or a blower in a steam turbine or a gas turbine, a generator or various facilities in a power plant. An oil drain pipe for discharging oil is connected. Then, at the time of completion of the rotating machine and the lubricating oil piping system, these piping systems are washed (flushing) with a lubricating oil or an equivalent oil in order to remove foreign substances existing therein.

FIG. 2 shows a conventional method of cleaning a lubricating oil piping system. In FIG. 2, 1 is a lubricating oil supply means,
2 is an oil tank, 3 is an oil cooler, 4 is a pressure regulating valve, 5
And 6 are oil pumps, 7 is an oil supply pipe, 8, 9 and 10 are turbines, 11 is a generator, 12 is a bearing, 13 is a strainer, and 14 is an oil drain pipe. 1 indicated by a dotted line
5 is a lubricating oil circulating means provided temporarily, 16 is a pump, 17
Is a filter, and 18 and 19 are pipes. The cleaning method is
First, the circulating means 15 is connected to the discharge pipes of the pumps 5 and 6 of the oil supply means 1, and then the pump 16 of the circulating means 15 is activated to wash the lubricant while circulating the lubricating oil to the bearings of the rotating machines. When there is no lubricating means 15 for lubricating oil provided temporarily, the oil is circulated by the pump 5 or 6 of the oil supply means 1. At this time, the bearing part of each rotating machine is connected to the oil supply pipe 7 at its inlet.
The filter 17 and the strainer 13 remove the foreign matter in the system while being protected from invasion of foreign matter by the strainer 13 installed in the system. Then, the oil returned from the oil drain pipe 14 to the oil tank 2 is circulated again.

[0004]

However, such a conventional cleaning method uses a lubricating oil having the same physical properties as during operation and performs cleaning while also using auxiliary means such as hammering. Economically, the flow velocity in the pipe cannot be increased significantly. Therefore, a long period of lubricating oil circulation is required to sufficiently perform the cleaning of the piping system. When a large number of bearings are connected to the lubricating oil piping system as in the power plant shown in FIG. More than one month of circulation is required. Accordingly, an object of the present invention is to provide a novel cleaning method capable of sufficiently achieving a predetermined degree of cleaning with a short period of cleaning in view of the problems of the conventional cleaning method.

[0005]

Means for Solving the Problems] To solve the above problems
The present invention relates to a lubricating oil supply means 1, an oil supply pipe 7 for supplying lubricating oil supplied from the oil supply means 1 to a bearing 12 of a rotating machine, and an oil supply means for discharging oil from the bearing 12. In a method for cleaning a bearing lubricating oil piping system of a rotating machine having an oil draining pipe 14 returning to 1, a bypass pipe 27 for bypassing an oil supply pipe 7 and an oil draining pipe 14 in a bearing part 12 of the rotary machine is provided. wherein the oil supply means 1 only compressed air supply is through the bypass pipe 27 from the fuel supply pipe 7 flow only the compressed air to the oil discharge pipe 14, the bearing portion 12 in a sufficient flow rate to achieve a predetermined detergency A cleaning method of a bearing lubricating oil piping system of a rotating machine, characterized by cleaning other piping systems and discharging dirty exhaust including foreign matter in the piping system to the outside of the system.

[0006]

The cleaning in the cleaning method of the present invention is performed by compressed air. The compressed air is first supplied to an oil supply pipe, then passes through a bypass pipe that bypasses a bearing portion of the rotating machine, passes through an oil discharge pipe, and is discharged outside the system. Therefore, the compressed air does not pass through the bearing. When a part of the lubricating oil is distributed and supplied to the control mechanism of the rotating machine, a part of the compressed air is discharged from the control oil pipe (not shown) to the outside of the system via the drain oil pipe. In this case, bypassing the control mechanism cannot be prevented. The pressure of the compressed air is set to a value such that the flow velocity is sufficient to obtain a predetermined cleaning power.
That is, in the present invention, since the gas cleaning method is used instead of the conventional liquid cleaning method, the cleaning air can be safely pressurized within the pressure resistance range of the piping. Therefore, the flow rate can be set such that a sufficient degree of cleaning can be obtained in a short period of time. In addition, since the contaminated exhaust gas after cleaning the inside of the piping is discharged to the outside of the system, there is no recirculation of foreign substances, and more effective flushing is achieved. Since the cleaning method of the present invention does not use oil, there is no danger of oil leakage or fire due to oil.
The cleaning method of the present invention preferably has a diameter of 25 mm (1 mm).
When applied to lubricating oil pipes of inch or more, the effect can be more exhibited.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is an explanatory view showing an example of the cleaning method of the present invention. 1, the same devices as those in FIG. 2 are denoted by the same reference numerals as those in FIG. Reference numeral 20 indicated by a dotted line denotes a provisional compressed air supply means, reference numeral 21 denotes an air compressor, reference numeral 22 denotes a dehumidifying and dedusting device, reference numeral 23 denotes an air tank, reference numeral 24 denotes a pressure gauge, reference numeral 25 denotes a safety valve, and reference numeral 26 denotes a pipe. This pipe 26 is connected to the discharge side pipes of the pumps 5 and 6 of the oil supply means 1. Further, the foreign matter collecting strainer 29 may be deleted if it is not necessary for confirming the amount of the collected foreign matter or determining the flushing result. Also, the mounting location may be moved to a more appropriate location.

The oil supply pipe 7 is temporarily connected to the bypass pipe 27 from near the bearing 12 of each rotating machine, and the bypass pipe 27 is temporarily connected to the oil discharge pipe 14. The bearing portion 12 of each rotating machine has its connection with the lubricating oil pipe closed with a temporary fixing flange or the like during the cleaning period. The oil drain pipe 14 is returned to the oil tank 2 of the oil supply means 1 during normal operation, but is switched to an exhaust pipe 28 for discharging outside the system during cleaning. Next, the cleaning method in FIG. 1 will be described.
The compressed air supplied from the air compressor 21 is dehumidified and dedusted by the dehumidification and dedusting device 22 and enters the air tank 23. The compressed air in the air tank 23 is supplied via the pipe 26 to the refueling means 1.
And flows into the oil supply pipe 7 through the discharge side pipes of the pumps 5 and 6, the pressure regulating valve 4, and the oil cooler 3. Note that an internal structure that prevents a sufficient flow rate of the compressed air, such as an oil cooler in the middle of the pipe, may be removed in advance.

The compressed air supplied to the oil supply pipe 7 is branched for each rotating machine, merges with the oil discharge pipe 14 via bypass pipes 27 for bypassing the respective bearing portions 12, and then flows from the exhaust pipe 28 to the system. Released outside. Refueling means 1,
The unit devices such as the bearing unit 12 of each rotating machine are cleaned and sealed at the time of shipment from the factory, and can be installed as they are at the installation site. Therefore, it is not necessary to perform site cleaning again. Rather, if air is allowed to flow through the bearing 12, fine foreign matter in the air may penetrate into the minute gaps in the bearing or cause rusting on the bearing. Therefore, in the present invention, compressed air is prevented from passing through the bearing 12 by the bypass pipe 27.

[0010] The pressure of the compressed air for cleaning the bearing lubricating oil piping system must be set to such a value that the flow velocity is sufficient to obtain a predetermined cleaning power as described above. For this pressure adjustment, the air supply means 20 may be provided with a pressure adjustment means, but the pressure adjustment valve 4 of the oil supply means 1 can also be used. next,
After the cleaning of the bearing lubricating oil piping system is completed, the air supply means 20 is stopped, the valve provided on the pipe 26 is closed, and the communication of the compressed air to the oil supply means 1 is closed. At that time, the pipe 26 may be removed from the oil supply means 1. Next, the oil supply pipe 7 and the oil discharge pipe 1
4 is switched to each of the bearing pipes 12 and the connection of the oil drain pipe 14 to the exhaust pipe 28 is switched to the oil supply means 1. By the above switching work,
The bearing lubrication oil piping system is in a piping state during operation. Therefore, next, the oil supply means 1 is started, and air is exhausted from the piping system by the lubricating oil, whereby the operation preparation of the rotating machine is completed.

[0011]

The cleaning method of the present invention has the above-described structure and has the following effects. (1) Since the gas cleaning method is used, cleaning air can be safely pressurized within the pressure range of the piping. Therefore, since the cleaning can be performed at a flow rate that can sufficiently obtain a predetermined cleaning degree in a short period of time, the time and labor required for cleaning can be significantly reduced. (2) Since dirty exhaust is discharged out of the system, there is no recirculation of foreign matter. (3) It is possible to sufficiently clean the vicinity of the top of a pipe, such as an oil drain pipe, which has not been connected to oil when flushing with conventional oil. (4) Since no oil is used for cleaning, there is no danger of oil leakage or fire due to oil. (5) Since the structure is such that the compressed air does not pass through the bearing portion, there is no danger that fine foreign substances in the air will get into the bearing portion 12 during cleaning and cause rusting.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a cleaning method of the present invention.

FIG. 2 is an explanatory view showing an example of a conventional cleaning method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oil supply means 2 Oil tank 3 Oil cooler 4 Pressure control valve 5 Oil pump 6 Oil pump 7 Oil supply pipe 8 Turbine 9 Turbine 10 Turbine 11 Generator 12 Bearing part 13 Strainer 14 Drainage pipe 15 Lubricating oil circulation means 16 Pump 17 Filter Reference Signs List 18 piping 19 piping 20 air supply means 21 air compressor 22 dehumidifying and dedusting device 23 air tank 24 pressure gauge 25 safety valve 26 piping 27 bypass piping 28 exhaust piping 29 foreign matter collecting strainer

Claims (1)

(57) [Claims] 1. An oil supply means 1 for lubricating oil, and the oil supply means 1
Bearing lubricating oil pipe for a rotary machine including an oil supply pipe 7 for supplying lubricating oil supplied from the bearing to a bearing 12 of the rotating machine, and an oil draining pipe 14 for returning oil discharged from the bearing 12 to the oiling means 1. In the system cleaning method, a bypass pipe 27 for bypassing the oil supply pipe 7 and the oil discharge pipe 14 in the bearing unit 12 of the rotating machine is provided, and only the compressed air is supplied to the oil supply means 1 so that the oil supply pipe 7 is through the bypass pipe 27 flows only compressed air into the oil discharge pipe 14, washing the piping system other than the bearing portion 12 in a sufficient flow rate to obtain a predetermined detergency, in the piping system
A method for cleaning a bearing lubricating oil piping system of a rotating machine, characterized by discharging contaminated exhaust containing foreign matter outside the system.