JP2003251116A - Lubricant device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricant device for suppressing the generation of static electricity at the time of supply of a lubricant to the bearings for supporting a rotary shaft and enabling safe and stable operation. <P>SOLUTION: This lubricant device is constituted so that a filter 39 is formed of a cylindrical casing 45 and this casing 45 is equipped with a guide cylinder 41 constituted of a filter cartridge 40 and a perforated plate. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil system applied to a bearing lubricating oil system for supplying lubricating oil to a bearing of a turbine shaft in a thermal power plant such as a combined cycle power plant and a simple cycle gas turbine plant. .

[0002]

2. Description of the Related Art In addition to a so-called simple cycle gas turbine power plant, which uses a gas turbine as a power source to drive a generator to rotate to generate electricity, recently, from the viewpoint of effective utilization of thermal energy, expansion by a gas turbine is performed. A so-called combined cycle in which the hot exhaust gas that has finished work is used as a heat source, steam is generated in the exhaust heat recovery boiler, the generated steam is supplied to the steam turbine to generate power, and the power is used to drive the generator to rotate. Power generation is in the limelight.

In this combined cycle power plant, for example, a gas turbine shaft and a steam turbine shaft are axially coupled to each other to form a single rotary shaft, and the rotary shaft is supported by a plurality of bearings.

As described above, the bearing that axially connects the gas turbine shaft and the steam turbine shaft and axially supports the rotating shaft, which is elongated, is provided with the lubricating oil device. The ones shown in are applied.

The combined cycle power plant has a gas turbine section 1, a steam turbine section 2 and an exhaust heat recovery boiler 3
It is configured by combining and.

The gas turbine section 1 comprises an air compressor 4, a gas turbine combustor 5 and a gas turbine 6. The air sucked by the air compressor 4 is compressed to a high pressure, and this high pressure air is fed to a fuel valve of a fuel system 14. The fuel is supplied to the gas turbine combustor 5 together with the fuel supplied from 15, and the combustion gas is generated there. The gas turbine 6 expands the combustion gas to generate power, and the power is used to rotate the generator 7. It is like this.

Further, the exhaust heat recovery boiler 3 uses the turbine exhaust gas from the gas turbine 6 as a heat source, the feed water from the steam turbine section 2 into steam, and uses this steam.
Is being supplied to.

Further, the steam turbine section 2 is provided with a steam turbine 8, a condenser 9 and a feed water pump 10, and the steam supplied from the exhaust heat recovery boiler is expanded by the steam turbine 8 and generated at that time. The generator 7 is rotationally driven by power.

On the other hand, a plurality of bearings 1 are attached to a rotary shaft 13 which forms a single unit by axially coupling the gas turbine shaft 11 of the gas turbine unit 1 and the steam turbine shaft 12 of the steam turbine unit 2.
6a, 16b, 16c, ..., 16f are provided.

A plurality of bearings 16a, 16b, 16c, ...
In 16f, the main refueling pump 1 installed in the refueling tank 17
8, auxiliary oil supply pump 19, emergency oil supply pump 20 to check valves 21a, 21b, 21c, oil cooler 22, filter 2
3. Lubricating oil is supplied through the hydraulic pressure adjusting valve 24.

A plurality of bearings 16a, 16b, 16c, ...
Lubricating oil is normally supplied from the main oil supply pump 18 to 16f, but when the oil pressure and the oil amount cannot be sufficiently secured, the gas turbine 16 and the steam turbine 18 are started,
When the main refueling pump 18 is stopped or the main refueling pump 18 fails, an AC electric motor driven auxiliary refueling pump 19 is used instead of the main refueling pump 18.

During operation of the auxiliary oil supply pump 19, AC
When the power is turned off or when an abnormality occurs in the auxiliary oil supply pump 19, a necessary bearing oil amount and oil pressure are secured, and the gas turbine 16 and the steam turbine 8 are safely stopped.
A power supply-driven emergency oil supply pump 20 is used.

In the lubricating oil system having such a structure, the lubricating oil discharged from the main oil supply pump 18 is cooled by the oil cooler 22 via the check valves 21a, 21b and 21c, and the filter 23, It is supplied to the bearings 16a, 16b, 16c, ..., 16f via the hydraulic pressure adjusting valve 24.

Bearings 16a, 16b, 16c, ..., 16f
The lubricating oil supplied to is recirculated to the oil supply tank 14 via a return pipe (not shown).

On the other hand, the filter 23 can be replaced during normal operation in consideration of clogging of the filter material inside the filter 23.
A plurality of valves are installed in parallel via a switching valve (not shown),
The structure is as shown in FIG.

The filter 23 has a filter cartridge 31 in an inlet chamber (primary chamber) 28 having an inlet 27 for partitioning the inside of a cylindrical casing 25 with a partition plate 26.
Are housed in a plurality of layers stacked in at least two stages along the axial direction of the casing.

The filter cartridge 31 is provided with a filter retainer 35 which is a combination of a retainer spring 33 and a retainer fitting 34 on the casing lid 32 for fixing against vibration generated when lubricating oil passes during operation.

Further, the filter cartridge 31 uses paper or chemical fibers as a filtering material, and the outer peripheral side of the cylinder is pleated with paper or chemical fibers.

Further, the filter cartridge 31 is replaced at that time when the pressure difference between the inlet and the outlet due to the hydraulic pressure becomes large and the amount of impurities and the like in the filtered oil reaches its limit.

On the other hand, as shown in FIG. 8, the casing 25 is provided with a baffle plate 36 which prevents the lubricating oil Luv flowing from the inlet 27 from directly colliding with the filter cartridge 31.

The filter cartridge 31 is provided with a guide cylinder 37 inwardly inscribed therein, and the partition plate 26 is provided on the bottom side thereof.
To communicate with the outlet chamber (secondary chamber) 30.

The guide cylinder 37 has a passage port 38 formed in the periphery thereof so that the lubricating oil Luv filtered by the filter cartridge 31 flows inside the guide cylinder 37.

In the filter 23 having such a structure, the lubricating oil Luv enters the casing 25 from the inlet 27 through the baffle plate 36, and after being filtered by the filter cartridge 31, the passage port 38 of the guide cylinder 37. And the like, and is sent to the outside from the outlet chamber 30 and the outlet 29.

[0024]

As the lubricating oil Luv used for the bearing of the combined cycle power plant, turbine oil having a high insulating property is used. When this turbine oil passes through the filter cartridge 31, it is known that a charging phenomenon occurs due to frictional resistance with the fibers of the filter medium.

However, although there are still many unclear points about the mechanism of static electricity generation due to electrification, it is considered to be due to the following reason.

As shown in FIG. 9, when the lubricating oil Luv passes through the filter cartridge 31, it is considered that the flow velocity is not completely uniform but locally increases in the flow velocity in the portion of the guide tube 37 facing the passage opening 38. Has been. It has been clarified in experiments that static electricity in oil is more likely to occur as the flow velocity is faster and the passage is narrower.

Therefore, it is considered that static electricity significantly increases the charge of oil in the region where the flow velocity is high.

The electric charge E in the oil flowing near the pipe wall of the guide cylinder 37 is discharged through the pipe wall. However, the charged lubricating oil Luv flowing near the center of the guide cylinder 37 balances with the electric charge E generated on the wall of the guide cylinder 37 due to the flow of the lubricating oil when passing through the guide cylinder 37. Therefore, the charged lubricating oil Luv cannot release the electric charge E to the outside.

Therefore, until the lubricating oil Luv flows from the guide cylinder 37 to the outlet chamber (secondary chamber) 30, the electric charge is retained as it is, and immediately after flowing out to the outlet chamber 30, a discharge phenomenon occurs due to the potential difference with the surroundings. .

When the amount of static electricity generated in the filter cartridge 31 is small and the flow velocity of the lubricating oil Luv in the guide cylinder 37 is low, the guide cylinder 37 is caused by the flow of the lubricating oil Luv.
Since the electric charge E generated on the wall also decreases, the lubricating oil Luv
The electric charge E therein is released to the outside while passing through the guide cylinder 37, and does not cause a discharge phenomenon or the like when flowing into the outlet chamber 30.

However, in the opposite case, the electric charge E is not discharged while passing through the guide tube 37, and the guide tube 37 causes the outlet chamber 3 to exit.
The release phenomenon occurs at the time of the outflow to zero. Further, when the amount of static electricity generated in the filter cartridge 31 is large, the lubricating oil Luv causes a discharge phenomenon immediately after leaving the filter cartridge 31.

When this discharge phenomenon occurs frequently, the voltage becomes extremely high, and the flame due to ignition of the lubricating oil Luv,
The filter cartridge 31 itself may be damaged, the lubricating oil itself may be deteriorated, and the operation of the plant may be stopped as well as the lubricating oil supply system.

The present invention has been made under such circumstances, and when supplying lubricating oil to a bearing that supports a rotating shaft, it is possible to suppress the generation of static electricity and to perform a safe and stable operation. An object is to provide an oil device.

[0034]

In order to achieve the above-mentioned object, a lubricating oil system according to the present invention supplies lubricating oil from a fuel tank to a bearing through a filter as described in claim 1. In the lubricating oil device, the filter is formed of a tubular casing, and includes a filter cartridge that is housed in the casing and a guide tube that is formed of a perforated plate that is housed in the filter cartridge. .

Further, in order to achieve the above-mentioned object, the lubricating oil system according to the present invention is a lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter as described in claim 2. The filter is formed of a tubular casing, and a filter cartridge to be housed in the casing and a guide tube having a plurality of racetrack-shaped oblong holes are to be housed in the filter cartridge.

Further, in order to achieve the above-mentioned object, the lubricating oil system according to the present invention is a lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter as described in claim 3. The filter is formed of a tubular casing, and includes a filter cartridge accommodated in the casing, and an expansion passage portion formed on the outlet side of a guide cylinder accommodated in the filter cartridge. .

In order to achieve the above-mentioned object, the lubricating oil system according to the present invention is a lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter as described in claim 4. The filter is formed of a tubular casing, and the inside of the casing is divided into an inlet chamber and an outlet chamber, a filter cartridge is housed in the inlet chamber, and a guide cylinder housed in the filter cartridge is provided at the outlet. The guide tube is extended to the chamber, and the extended end of the guide tube is provided with an opening whose number gradually increases from the upstream side to the downstream side.

Further, in order to achieve the above-mentioned object, the lubricating oil system according to the present invention is a lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter as described in claim 5. The filter is formed of a cylindrical casing, the casing is divided into an inlet chamber and an outlet chamber, a filter cartridge is accommodated in the inlet chamber, and a guide cylinder accommodated in the filter cartridge is disposed at the outlet. The guide tube is extended to the chamber, and an outlet end portion of the extended guide tube is provided with an opening that gradually increases its hole diameter from its upstream side to its downstream side.

In order to achieve the above-mentioned object, the lubricating oil system according to the present invention is a lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter as described in claim 6. The filter is formed of a tubular casing, and is provided with a filter cartridge housed in the casing and an electric charge releasing portion inside a guide cylinder housed in the filter cartridge.

In the lubricating oil system according to the present invention, in order to achieve the above-mentioned object, as described in claim 7, the charge escape portion is composed of a ground rod.

[0041]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a lubricating oil system according to the present invention will be described below with reference to the drawings and the reference numerals attached to the drawings.

FIG. 1 is a partially cutaway vertical sectional view showing a first embodiment of a lubricating oil system according to the present invention.

In the lubricating oil system according to the present embodiment, the filter 39 is formed by the cylindrical casing 45, and the filter cartridge 40 is housed in this casing 45.
Guide tube 41 accommodated in the filter cartridge 40
Is composed of a perforated plate 42 such as punching metal.

As described above, in this embodiment, the guide cylinder 41 is formed of the perforated plate 42, and when the lubricating oil Luv flows from the filter cartridge 40 to the guide cylinder 41, the flow of the lubricating oil Luv has a relatively small restriction. At the same time, since the increase in the flow velocity is alleviated, the generation of static electricity can be reduced and the lubricating oil Luv can be supplied to the bearing safely and stably without a discharge phenomenon.

FIG. 2 is a partially cutaway vertical sectional view showing a second embodiment of the lubricating oil system according to the present invention.

In the lubricating oil system according to this embodiment, a large number of racetrack elliptical holes 43 are formed in the circumferential direction in a guide cylinder 41 housed in a filter cartridge 40.

As described above, according to the present embodiment, a large number of oblong holes 43 having a long window shape are formed in the guide cylinder 41 in the circumferential direction, and the lubricating oil Luv is passed from the filter cartridge 40 to the guide cylinder 41.
When the oil flows, the flow of the lubricating oil is made relatively small, and the high-speed flow is alleviated.
The generation of static electricity can be reduced, and the lubricating oil Luv can be safely and stably supplied to the bearing without a discharge phenomenon.

FIG. 3 is a partially cutaway vertical sectional view showing a third embodiment of the lubricating oil system according to the present invention.

In the lubricating oil system according to this embodiment, the guide cylinder 41 accommodated in the filter cartridge 40 has an outlet side,
For example, a trumpet-shaped expansion passage portion 44 is formed. The expansion passage portion 44 may be linear or curved toward the downstream side. Further, the expansion passage portion 44
Is an inlet chamber 4 that divides the casing 45 with a partition plate 46.
It may be formed in the inside 7 or may extend to the outlet chamber 48.

As described above, in this embodiment, the expansion passage portion 44 is formed on the outlet side of the guide cylinder 41, the flow velocity of the lubricating oil Luv flowing through the outlet of the guide cylinder 41 is reduced, and the lubricating oil Luv is generated. Since the electric charge E is released through the expansion passage portion 44, it is possible to reduce the generation of static electricity and supply the lubricating oil Luv to the bearing safely and stably without a discharge phenomenon.

FIG. 4 is a partially cutaway vertical sectional view showing a fourth embodiment of the lubricating oil system according to the present invention.

In the lubricating oil system according to this embodiment, the outlet end 44 of the guide cylinder 41 housed in the filter cartridge 40.
Through the partition plate 46 that divides the inside of the casing 45 into the inlet chamber 47 and the outlet chamber 48, and extends to the outlet chamber 48, and the number and the diameter of the openings 50 formed at the outlet end 49 are changed from the upstream side thereof. The number is gradually increased toward the downstream side, and the size is increased.

As described above, in this embodiment, the outlet end 49 of the guide cylinder 41 is extended to the outlet chamber 48, and the outlet end 49 is formed.
The number and the hole diameter of the openings 50 formed in the portion are gradually increased from the upstream side to the downstream side and further increased, and when the lubricating oil Luv is flowed out from the guide cylinder 41, the lubricating oil Luv is flowed out at substantially the same flow rate, Since the electric charge E contained in the lubricating oil Luv is satisfactorily released, the generation of static electricity is reduced, and the lubricating oil Luv is reduced.
Can be safely and stably supplied to the bearing without a discharge phenomenon.

FIG. 5 is a partially cutaway vertical sectional view showing a fifth embodiment of the lubricating oil system according to the present invention.

In the lubricating oil system according to this embodiment, the charge escape portion 52 formed of the ground rod 53 supported by the ribs 51a and 51b arranged in a cross shape is provided in the guide cylinder 41 housed in the filter cartridge 40. It is provided.

As described above, according to this embodiment, the rib 51 is provided in the guide cylinder 41 housed in the filter cartridge 40.
A charge escape portion 52 formed of a ground rod 53 supported by a and 51b is provided, and the filter cartridge 40 to the guide tube 4 are provided.
The electric charge E contained in the lubricating oil Luv flowing into the opening 50 of No. 1
Is discharged by the charge releasing portion 52, the generation of static electricity can be reduced and the lubricating oil Luv can be safely and stably supplied to the bearing without a discharge phenomenon.

[0057]

As described above, the lubricating oil device according to the present invention reduces the flow velocity of the lubricating oil passing through the filter cartridge and suppresses the generation of static electricity, while effectively reducing the charge contained in the lubricating oil. Since it is released, the lubricating oil can be supplied to the bearing safely and stably without the release phenomenon.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical sectional view showing a first embodiment of a lubricating oil system according to the present invention.

FIG. 2 is a partially cutaway vertical sectional view showing a second embodiment of a lubricating oil device according to the present invention.

FIG. 3 is a partially cutaway vertical sectional view showing a third embodiment of a lubricating oil device according to the present invention.

FIG. 4 is a partially cutaway vertical sectional view showing a fourth embodiment of a lubricating oil system according to the present invention.

FIG. 5 is a partial cutaway vertical sectional view showing a fifth embodiment of a lubricating oil system according to the present invention.

FIG. 6 is a schematic system diagram showing a conventional lubricating oil device applied to a combined cycle power plant.

FIG. 7 is a partially cutaway sectional view showing a filter incorporated in a conventional lubricating oil system.

FIG. 8 is a partial cross-sectional view of the inlet shown in FIG.

FIG. 9 is a conceptual diagram showing the behavior of lubricating oil with electric charges.

[Explanation of symbols]

1 gas turbine section 2 Steam turbine section 3 Exhaust heat recovery boiler 4 air compressor 5 gas turbine combustor 6 gas turbine 7 generator 8 steam turbine 9 condenser 10 water supply pump 11 gas turbine shaft 12 Steam turbine shaft 13 rotation axis 14 Fuel system 15 fuel valve 16a, 16b, 16c, ..., 16f Bearing 17 Refueling tank 18 Main oil pump 19 Auxiliary oil pump 20 Emergency lubrication pump 21a, 21b, 21c Check valve 22 Oil cooler 23 Filter 24 Hydraulic control valve 25 casing 26 partition boards 27 entrance 28 entrance room 29 exit 30 exit room 31 Filter Cartridge 32 casing lid 33 Presser spring 34 Press fitting 35 Filter foot 36 baffle board 37 guide tube 38 Passage 39 filters 40 filter cartridge 41 Guide tube 42 Perforated plate 43 oval hole 44 Expansion passage 45 casing 46 Partition board 47 entrance room 48 exit rooms 49 Exit end 50 openings 51a, 51b rib 52 Charge escape part 53 Ground rod

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 29/10 530B

Claims (7)

[Claims] 1. A lubricating oil device for supplying lubricating oil from a fuel tank to a bearing through a filter, wherein the filter is formed of a cylindrical casing, and the filter cartridge is housed in the casing, and the inside of the filter cartridge. And a guide cylinder configured by a perforated plate to be housed in the lubricating oil device. 2. A lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter, wherein the filter is formed of a cylindrical casing, a filter cartridge accommodated in the casing, and a plurality of racetracks. The lubricating oil system according to claim 1, wherein a guide cylinder having a rectangular oval hole is housed in the filter cartridge. 3. A lubricating oil system for supplying lubricating oil from a fuel tank to a bearing through a filter, wherein the filter is formed of a tubular casing, and the filter cartridge is housed in the casing, and the filter cartridge And a widening passage portion formed on the outlet side of the guide cylinder accommodated in the lubricating oil device. 4. In a lubricating oil device for supplying lubricating oil from a fuel tank to a bearing through a filter, the filter is formed of a cylindrical casing, and the inside of the casing is divided into an inlet chamber and an outlet chamber, While accommodating the filter cartridge in the inlet chamber, the guide cylinder accommodated in the filter cartridge is extended to the outlet chamber, and the outlet end portion of the extended guide cylinder is moved from its upstream side to its downstream side. A lubricating oil device, which is provided with openings for gradually increasing the number thereof. 5. In a lubricating oil device for supplying lubricating oil from a fuel tank to a bearing through a filter, the filter is formed of a cylindrical casing, and the inside of the casing is divided into an inlet chamber and an outlet chamber, While accommodating the filter cartridge in the inlet chamber, the guide cylinder accommodated in the filter cartridge is extended to the outlet chamber, and the outlet end portion of the extended guide cylinder is moved from its upstream side to its downstream side. A lubricating oil device comprising an opening for gradually increasing the hole diameter. 6. A lubricating oil device for supplying lubricating oil from a fuel tank to a bearing via a filter, wherein the filter is formed of a tubular casing, and the filter cartridge is housed in the casing, and the filter cartridge A lubricating oil device, characterized in that a charge releasing portion is provided inside a guide cylinder housed in the. 7. The lubricating oil system according to claim 6, wherein the charge escape portion is composed of a ground rod.