JPH11101103A - Device for supplying lubricating oil into steam turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for supplying a lubricating oil into a steam tur bine, which can maintain a negative pressure condition in a bearing chamber even through a manhole of a tank is opened during operation of the turbine, so as to prevent the lubrication oil from leaking through an oil slinger seal. SOLUTION: A device for supplying a lubricating oil into a steam turbine, comprises a bearing chamber 60, a first oil tank 11 having a booster pump 13, and a second oil tank 12, the bearing chamber 60 being connected with the booster pump 13 through an oil supply pipe 17, and the bearing chamber 60 being connected with the second oil tank 12 through an oil return pipe 18. Further, the lower part of the first oil tank 11 and the lower part of the second oil tank 12 are connected with each other through an oil communicating pipe 20, and the upper part of the first oil tank and the upper part of the second oil tank are connected with each other through a gas communication pipe 25 which is provided therein with a gas flow control valve 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine lubricating oil supply device used for large steam turbines such as thermal power plants and nuclear power plants, and more particularly to a steam turbine lubricating oil supply device capable of preventing leakage of lubricating oil. .

[0002]

2. Description of the Related Art Generally, a large rotating machine such as a large steam turbine is provided with a lubricating oil supply device for supplying lubricating oil to a bearing chamber of each bearing.

FIG. 14 shows a configuration of a conventional steam turbine lubricating oil supply device. As shown in FIG. 14, the rotating shaft 2 of the conventional steam turbine 1 is rotatably held by a bearing 91, and the bearing 91 has a steam turbine lubricating oil supply device 80.
Supplies lubricating oil. In this case, the steam turbine lubricating oil supply device 80 includes a bearing chamber 90 containing a bearing 91,
A first oil tank 81 having a booster pump 83 and a turning oil pump 84 and the like, and a second oil tank 82 having an oil cooler 85 and the like are provided. The bearing chamber 90 and the booster pump 83 are connected by an oil supply pipe 87, and the bearing chamber 9
0 and the second oil tank 82 are connected by an oil return pipe 88. The lower portion of the first oil tank 81 and the second oil tank 8
The lower part of 2 is connected by an oil communication pipe 95, and the upper part of the first oil tank 81 and the upper part of the second oil tank 82 are connected by a gas communication pipe 96.

The bearing chamber 90 accommodates the bearing 91 as described above and covers the bearing 91 so as to hermetically seal the bearing 91. An oil-seal seal using a labyrinth packing is provided at a portion in contact with the rotating shaft. (FIGS. 3 and 4
reference).

[0005] As shown in FIG.
From the booster pump 83 of the oil tank 81 to the turning pump 84, the oil communication pipe 95, the second oil tank 82, the oil cooler 8
5 and an oil return pipe 88 to a bearing 91 in a bearing chamber 90.

The lubricating oil O in the first oil tank 81 and the second oil tank 82 can be communicated through an oil communication pipe 95 connecting the lower portions of the two tanks 81, 82. , 82 have substantially the same oil level. The oil level of both tanks 81 and 82 is
The oil amount is adjusted so as to be located below 6.

A gas extractor 97 is provided above the second oil tank 82 so that gas above the oil level can be extracted. By the gas extraction by the gas extractor 97, the respective spaces on the oil surface of the second oil tank 82, the oil return pipe 88, the bearing chamber 90, the gas communicator 96, and the oil surface of the first oil tank 81 become outside. The state can be a negative pressure with respect to the atmospheric pressure.

On the other hand, a manhole 81m is provided above the first oil tank 81 for opening and closing the hydraulic adjustment valve 83a of the booster pump 83. When the manhole 81m is opened, the booster is opened. The hydraulic adjustment valve 83a of the pump 83 can be operated.

Next, a conventional steam turbine lubricating oil supply device 8
The operation of 0 will be described. As shown in FIG. 14, the lubricating oil O is supplied to the bearing 91 in the bearing chamber 90 via the oil supply pipe 87 by the booster pump 83. The lubricating oil O supplied to the bearing 91 plays a lubricating action on the bearing 91. At the same time, the lubricating oil O scatters and falls into the bearing chamber 90 with the rotation of the rotating shaft 2 of the steam turbine 1, and is further collected in the second oil tank 82 through the oil discharge pipe 88.

Here, in order to prevent the lubricating oil O from leaking from the oil drain seal of the bearing chamber 90 to the outside, the gas is continuously extracted by the gas extractor 97,
The bearing chamber 90 is under a negative pressure with respect to the outside air pressure. As a result, the outside air constantly flows into the bearing chamber 90 from a minute gap between the oil drain seal of the bearing chamber 90 and the rotating shaft, so that a high sealing effect of the lubricating oil can be obtained without hindering the rotation of the rotating shaft. Can be.

[0011]

However, in the conventional steam turbine lubricating oil supply device 80, it may be desired to adjust the supply oil pressure of the booster pump 83 during operation of the turbine. In this case, in order to operate the hydraulic adjustment valve 83a,
81 m of manhole provided at the top of the first oil tank 81
At this time, a large amount of outside air flows into the space above the oil level of the first oil tank 81 from the manhole 81m. Therefore, on the oil level of the first oil tank 81, the gas communication pipe 96, the second
On the oil level of the oil tank 82, the pressure in each space of the oil return pipe 88 and the bearing chamber 90 rises, the sealing effect of the oil drain seal decreases, and the lubricating oil O may leak from the oil drain seal. I will.

As the lubricating oil O, a flammable oil of class 4 petroleum is generally used.
Since the outer surface temperature of the casing heat insulating material near 0 is as high as 350 ° C. or more, it is necessary to consider a dangerous state such as ignition or smoking in the worst case when the lubricating oil O comes into contact with this heat insulating material. was there.

The present invention has been made in view of such a point, and maintains a negative pressure state in a bearing chamber even when a manhole or the like of a tank is opened during operation of a turbine so that the oil drain seal can be used. It is an object of the present invention to provide a steam turbine lubricating oil supply device that can prevent leakage of lubricating oil.

[0014]

SUMMARY OF THE INVENTION The present invention provides a bearing chamber containing a bearing for a steam turbine, a first oil tank having a booster pump, a second oil tank, and a booster in the bearing chamber and the first oil tank. An oil supply pipe connecting the pump, an oil return pipe connecting the bearing chamber and the second oil tank, an oil communication pipe connecting a lower part of the first oil tank and a lower part of the second oil tank, A gas communication pipe connecting the upper part of the oil tank and the upper part of the second oil tank, a gas flow control valve provided in the gas communication pipe,
A steam turbine lubricating oil supply device comprising:

According to the present invention, since the gas flow control valve is closed when the manhole of the first oil tank is opened, the outside air flowing from the manhole can be shut off by the gas flow control valve. Thus, a negative pressure state in the bearing chamber can be maintained.

According to the present invention, a bearing chamber accommodating a steam turbine bearing, a first oil tank having a booster pump, a second oil tank, and a bearing chamber and a booster pump in the first oil tank are connected. An oil supply pipe, an oil return pipe connecting the bearing chamber and the second oil tank, a lower part of the first oil tank and a second oil tank.
An oil communication pipe connecting the lower part of the oil tank; and a gas communication pipe connecting the upper part of the first oil tank and the upper part of the second oil tank, wherein the gas connection pipe is connected to the first oil tank or the second oil tank. An oil inlet is formed in a U-shape having a bottom extending below the oil level of the oil tank, and communicates with at least one of the first oil tank and the second oil tank at the bottom of the gas communication pipe and has an oil discharge valve. A lubricating oil supply device for a steam turbine, comprising a pipe.

According to the present invention, when the manhole or the like of the first oil tank is opened, the oil injection valve is opened and the lubricating oil in the tank is introduced from the oil introduction pipe into the gas communication pipe, whereby the gas communication can be performed. A U-seal made of lubricating oil is formed in the pipe, and the U-seal shuts off external air flowing from a manhole or the like, so that a negative pressure state in the bearing chamber can be maintained.

Further, the present invention provides a bearing chamber containing a steam turbine bearing, an oil tank having a booster pump, an oil supply pipe connecting the bearing chamber and a booster pump in the oil tank, a bearing chamber and an oil tank. An oil return pipe connecting the oil pump to the oil tank, the oil tank having a sealed booster pump chamber for accommodating the booster pump, and an oil discharge for discharging oil in the booster pump chamber to the oil tank on a wall surface of the booster pump chamber. A steam turbine lubricating oil supply device comprising a mechanism.

According to the present invention, since the booster pump chamber accommodating the booster pump is sealed, a negative pressure state in the bearing chamber can be maintained even when the manhole of the booster pump chamber is opened. Furthermore, even if lubricating oil leaks in the enclosed booster pump chamber, the oil draining mechanism discharges the leaked oil, thus avoiding overflow of the lubricating oil when opening the manhole of the booster pump chamber. it can.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 are configuration diagrams showing a first embodiment of a steam turbine lubricating oil supply device according to the present invention. As shown in FIGS. 1 and 2, the rotating shaft 2 of the steam turbine 1 is rotatably held by a bearing 61.
Lubricating oil is supplied from zero. In this case, the steam turbine lubricating oil supply device 10 includes a bearing chamber 60 containing a bearing 61.
A first oil tank 11 having a booster pump 13,
And a second oil tank 12. The bearing chamber 60 and the booster pump 13 are connected by an oil supply pipe 17,
The bearing chamber 60 and the second oil tank 12 are connected by an oil return pipe 18. Further, the lower part of the first oil tank 11 and the lower part of the second oil tank 12 are connected to the oil connecting pipe 2 arranged in the horizontal direction.
0, the upper part of the first oil tank 11 and the upper part of the second oil tank 12 are connected by a gas communication pipe 25 arranged horizontally, and a gas flow control valve 26 is connected to the gas communication pipe 25. Installed.

As shown in FIGS. 3 and 4, the bearing chamber 60 houses the bearing 61 as described above, and
Oil seal 6 using a labyrinth packing at the contact portion with the rotating shaft 2.
3 are provided.

As shown in FIG. 1, the first oil tank 11 further has a turning oil pump 14 therein.
The second oil tank 12 has an oil cooler 15. The oil supply pipe 17 includes a booster pump 13 of the first oil tank 11, a turning oil pump 14, an oil communication pipe 20, an oil cooler 1
5 and the bearing 61 in the bearing chamber 60 via the oil return pipe 18
Extending to

The lubricating oil O in the first oil tank 11 and the second oil tank 12 can communicate with each other through an oil communication pipe 20 connecting the lower parts of the two tanks 11 and 12.
The oil surface heights 1 and 12 are substantially the same. The oil level is adjusted so that the oil level of the tanks 11 and 12 is located below the gas communication pipe 25.

A gas extractor 27 is provided above the second oil tank 12 so that gas above the oil level can be extracted. Due to the gas extraction by the gas extractor 27, each space on the oil surface of the second oil tank 12, the oil return pipe 18, the bearing chamber 60, the gas communicator 25, and the oil surface of the first oil tank 11, A negative pressure state with respect to the outside air pressure can be set.

Also, as shown in FIG.
Has an operating lever 26b. By operating the operating lever 26b, the gas flow control valve 26 can be freely opened and closed in the gas flow control pipe 25.

On the other hand, a manhole 11m which can be opened and closed for operating a hydraulic pressure adjusting valve 13a of the booster pump 13 is provided above the first oil tank 11, and the booster pump is opened by opening the manhole 11m. 13
Can be operated.

Next, the operation of the present embodiment having such a configuration will be described. As shown in FIGS. 1 and 2, the lubricating oil O is supplied by the booster pump 13 to the bearing 61 in the bearing chamber 60 via the oil supply pipe 17. The lubricating oil O supplied to the bearing 61 plays a lubricating action on the bearing 61, and at the same time, the lubricating oil O scatters and falls into the bearing chamber 60 with the rotation of the rotating shaft 2 of the steam turbine 1, and further, an oil discharge pipe After being collected in the second oil tank 12.

Here, in order to prevent the lubricating oil O from leaking from the oil drain seal 63 of the bearing chamber 60 to the outside, the gas is continuously extracted by the gas extractor 27 so that the pressure of the bearing chamber 60 is reduced to the external pressure. With negative pressure (-38m
mAq to about -50 mmAq). As a result, the outside air constantly flows into the bearing chamber 60 from a minute gap between the oil drain seal 63 of the bearing chamber 60 and the rotating shaft 2, so that the rotation of the rotating shaft 2 is not hindered, and the sealing of the lubricating oil O is high. The effect can be obtained.

During the operation of the turbine, the booster pump 1
When it is desired to adjust the supply oil pressure of the first oil tank 1
The manhole 11m provided at the upper part of 1 is opened to operate the hydraulic adjustment valve 13a of the booster pump 13. At this time, the operating lever 26b of the gas flow control valve 26 is operated to close the gas flow control valve 26, and the conduction of the gas flow connecting pipe 25 is restricted. When manhole 11m opens, manhole 11
m, a large amount of outside air flows into the space above the oil surface of the first oil tank 11, but since the inflow of air is blocked by the gas flow control valve 26, the manhole 11m is opened in the bearing chamber 60. No effect. That is, the negative pressure state in the bearing chamber 60 is maintained.

After the adjustment of the hydraulic pressure adjusting valve 13a is completed, after the manhole 11m is closed, the gas flow control valve 26 is gradually opened so that the negative pressure state in the bearing chamber 60 is not largely affected.

The gas flow control valve 26 may be closed even when the manhole 11m is not opened. But in this case,
If there is a pressure difference in both areas delimited by the gas flow control valve 26, the gas flow control valve 26 must always withstand the pressure difference and must be more rigidly configured.

As described above, according to the present embodiment, even if the manhole 11m is opened, the negative pressure state in the bearing chamber 60 can be maintained, the sealing effect of the oil drain seal 63 is reduced, and the lubricating oil is reduced. Is reliably prevented from leaking. Therefore, the danger of ignition or smoking due to leakage of the lubricating oil can be reliably avoided.

Next, a second embodiment of the steam turbine lubricant supply device according to the present invention will be described with reference to FIG. In FIG. 5, in the steam turbine lubricating oil supply device 10 according to the second embodiment, a first oil tank 11 is provided with an openable and closable manhole 11m provided on an outer wall and having an operation lever 11b attached thereto. The gas flow control valve 26 has an operating lever 26b for opening and closing the gas flow control valve 26. Further, the operating lever 11b and the operating lever 26b are connected by a lever connecting rod 28.
Other configurations are substantially the same as those of the first embodiment shown in FIGS. In FIG. 5, the first shown in FIGS.
The same reference numerals are given to the same portions as those of the embodiment, and the detailed description is omitted.

A steam turbine lubricating oil supply device 1 shown in FIG.
0, when the manhole 11m is opened by the operating lever 11b, the operating lever 26 is operated by the lever connecting rod 28.
b automatically closes the gas flow control valve 26 at the same time. Conversely, when the manhole 11m is closed by the operation lever 11b, the operating lever 26 is operated by the lever connecting rod 28.
b automatically opens the gas flow control valve 26 at the same time.

As described above, according to the present embodiment, the gas flow control valve 26 is automatically opened and closed simultaneously only by opening and closing the manhole 11m by the operation lever 11b. Can be prevented from being forgotten, and the danger of ignition and smoking due to leakage of lubricating oil can be more reliably avoided.

Next, a third embodiment of the steam turbine lubricating oil supply device according to the present invention will be described with reference to FIGS. As shown in FIGS. 6 to 8, the steam turbine lubricating oil supply device 10 of the third embodiment is different only in the configuration of the gas flow control valve 26 and the gas communication pipe 25.
Other configurations are substantially the same as those of the first embodiment shown in FIGS. 6 to 8, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description will be omitted.

6 to 8, the gas flow control valve 26
Are a conical outer peripheral portion 30c diverging toward the first oil tank 11, a cylindrical outer peripheral portion 30p, and a conical outer peripheral portion 30c.
And through hole 3 axially penetrating cylindrical outer peripheral portion 30p
0 h, and an elastic spring 35 having one end connected to the end of the cylindrical member 30 on the second oil tank 12 side and the other end supported by the gas communication pipe 25. Further, the gas communication pipe 25 has a conical inner peripheral portion 25c that can engage with the conical outer peripheral portion 30c of the tubular member 30.

As described above, the other end of the elastic spring 35 is supported by the gas connecting pipe 25. In this case, the other end of the elastic spring 35 is connected via the spring mounting plate 36 fixed to the gas connecting pipe 25. Supported by the gas communication pipe 25. Also,
As shown in FIGS. 6 to 8, a parallel annular guide 31 is fixed to the inner surface of the gas connecting pipe 25, and the cylindrical outer peripheral portion 30 p of the tubular member 30 slidably passes through the inside of the parallel annular guide 31. ing. Thereby, the tubular member 30 is held substantially parallel to the gas connecting pipe 25 and can slide in the axial direction as the elastic spring 35 expands and contracts.

The conical outer peripheral portion 30c of the cylindrical member 30 and the conical inner peripheral portion 25c of the gas communication tube 25 form a sufficient gap P when the elastic spring 35 has a natural length, and the elastic spring 35 is compressed. It is provided in such a positional relationship as to engage when it is performed. When the conical outer peripheral portion 30c and the conical inner peripheral portion 25c engage, the elastic spring 35 is not further compressed.
The elastic spring 35 is not completely compressed and does not block the elastic spring 35, the spring mounting plate 36, and the end 30e of the through hole 30h.

Next, the operation of the present embodiment having the above configuration will be described. As shown in FIGS. 6 and 7, when the manhole 11m of the first oil tank 11 is closed, the gas is continuously extracted by the gas extractor 27 (see FIG. 1), so that the second oil tank 12 is closed. The space above the oil surface is under negative pressure. At this time, the gas flow control valve 26 of the present embodiment is opened not only by the through hole 30h but also by the gap P because the elastic spring 35 is in a natural length state. The space above and the space above the oil surface of the second oil tank 12 are in a state where gas is sufficiently conducted. Therefore, the space above the oil level of the first oil tank 11 also
The negative pressure state is substantially the same as the space above the oil level of the second oil tank 12.

When the manhole 11m provided above the first oil tank 11 is opened during the operation of the turbine, a large amount of outside air flows into the space above the oil surface of the first oil tank 11 from the manhole 11m. When the large amount of outside air reaches the end surface 30a of the cylindrical member 30 of the gas flow control valve 26, the end surface 30a is pressed by the outside air pressure, and the elastic spring 35 is compressed accordingly. For this reason, as shown in FIG.
Is engaged with the conical inner peripheral portion 25c of the gas communication pipe 25, and the gap P that has been opened is closed. The through hole 30h of the gas flow control valve 26 remains open, but since the through hole 30h is a small hole, the outside air flowing from the through hole 30h into the space above the oil surface of the second oil tank 12 is gaseous. The extractor 27 can sufficiently cope with this, and the effect of opening the manhole 11m in the bearing chamber 60 is eliminated. That is, the negative pressure state in the bearing chamber 60 is maintained.

When the manhole 11m is closed, no outside air flows into the first oil tank 11. The outside air already flowing into the first oil tank 11 is supplied to the through-hole 3 of the gas flow control valve 26.
From 0h, the gas gradually moves to the second oil tank 12 and is extracted from the gas extractor 27. Accordingly, the cylindrical member 30
The outside air pressure that presses the end surface 30a of the cylindrical member 30 also gradually decreases, and again the conical outer peripheral portion 30c of the cylindrical member 30 and the gas communication pipe 25
Is separated from the conical inner peripheral portion 25c, and the gap P is opened. Therefore, the pressure in the space above the oil surface of the first oil tank 11 and the pressure in the space above the oil surface of the second oil tank 12 return to the same negative pressure state.

As described above, according to the present embodiment, the gas flow control valve 2 can be operated only by opening and closing the manhole 11m.
Since the opening and closing of 6 is performed automatically, it is possible to prevent forgetting to open and close the gas flow control valve 26, and it is possible to more reliably avoid the danger of ignition and smoking due to leakage of lubricating oil. In particular, since the gas flow control valve 26 in the present embodiment gradually changes in the open / closed state according to the pressure state of the space above the oil surface of the first oil tank 11, the gas flow control valve 26 can be used for the rapid opening / closing of the valve. Since there is no accompanying rapid pressure change, the durability of the gas communication pipe 25 and the gas flow control valve 26 is improved.

Next, referring to FIGS. 9 and 10, a fourth embodiment of the steam turbine lubricating oil supply device according to the present invention will be described. As shown in FIGS. 9 and 10, the steam turbine lubricating oil supply device 10 of the fourth embodiment is different only in the configuration of the gas communication pipe 25, and the other configurations are the same as those shown in FIGS. 1 to 4. This is substantially the same as the first embodiment. 9 and 10, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

As shown in FIGS. 9 and 10, the gas communication pipe 25 is formed in a U-shape having a bottom portion B extending below the oil level of the first oil tank 11 or the second oil tank 12.
An oil introduction pipe 41 communicating with the first oil tank 11 is provided at the bottom B of the gas communication pipe 25. Further, the oil introduction pipe 41
Is provided with an oil discharge valve 42, and an oil inlet pipe 41 is provided with an oil injection valve 43.

An oil discharge pipe 44 is provided between the oil injection valve 43 of the oil introduction pipe 41 and the bottom B of the gas communication pipe 25. The bottom of the oil discharge pipe 44 is U-shaped, and the oil discharge pipe 44 is provided with an oil discharge valve 42.

Although the example in which the oil introduction pipe 41 is connected to the first oil tank 11 is shown, the second oil tank 12
May be connected.

Next, the operation of the present embodiment having such a configuration will be described. At the time of initial setting, the oil introduction pipe 41
The oil injection valve 43 and the oil discharge valve 42 of the oil discharge pipe 44 are opened to discharge a small amount of lubricating oil O to the oil discharge pipe 44 via the oil introduction pipe 41. The oil injection valve 43 is closed immediately after injection of a small amount of the lubricating oil O. Thereby, as shown in FIG.
The lubricating oil O is stored at the U-shaped bottom of the oil discharge pipe 44. When the manhole 11m (see FIG. 1) of the first oil tank 11 is closed, the state where the oil injection valve 43 of the oil introduction pipe 41 is closed and the oil discharge valve 42 is opened is maintained. At this time,
Only gas is present in the U-shaped gas communication pipe 25,
The space above the oil surface of the oil tank 11 and the space above the oil surface of the second oil tank 12 are in a state where gas conducts. Therefore, the first
The space above the oil surface of the oil tank 11 is also the gas extractor 27 (FIG. 1).
2), the second oil tank 12 being in a negative pressure state
Is in the same negative pressure state as the space above the oil level. In this case, since the oil discharge valve 42 is kept open, the oil mist in the gas does not accumulate at the bottom B of the gas communication pipe 25.

When the manhole 11m provided above the first oil tank 11 is opened during the operation of the turbine, the oil discharge valve 42 is closed and the oil injection pipe 41 is filled with oil, as shown in FIG. The valve 43 is opened. As a result, the lubricating oil O in the first oil tank 11 is introduced from the oil introduction pipe 41 to the bottom B of the gas communicator 25. The first oil tank 11 side is connected to the first oil tank 11 in the U-shaped gas communication pipe 25.
And the second oil tank 12 side is filled with lubricating oil O up to the same height as the oil level of the second oil tank 12. A U seal is formed, and the conduction of gas in the gas communication tube 25 is cut off. When the manhole 11m is opened, a large amount of outside air flows from the manhole 11m into the space above the oil surface of the first oil tank 11, but the conduction of gas is interrupted by the lubricating oil O in the gas communication pipe 25. Room 60 (FIG. 3)
And FIG. 4) is not affected by opening the manhole 11m. That is, the negative pressure state in the bearing chamber 60 is maintained.

After the manhole 11m is closed, the oil injection valve 43 is closed, and then the oil discharge valve 42 is opened to discharge the lubricating oil O introduced into the gas communication pipe 25. Lubricating oil O
The gas communication pipe 25 is restored to the conductive state by the discharge, and the space on the oil surface of the first oil tank 11 returns to the same negative pressure state as the space on the oil surface of the second oil tank 12.

As described above, according to the present embodiment, even if the manhole 11m is opened, the negative pressure state in the bearing chamber 60 can be maintained, and the sealing effect of the oil drain seal 63 (see FIG. 4) can be improved. It is reliably prevented that the lubricating oil leaks due to the decrease. Therefore, the danger of ignition or smoking due to leakage of the lubricating oil can be reliably avoided.

Next, a fifth embodiment of the steam turbine lubricant supply device according to the present invention will be described with reference to FIGS. As shown in FIGS. 11 to 13, the steam turbine lubricating oil supply device 10 according to the fifth embodiment has a
The only difference is that the oil tank 11 has a sealed booster pump chamber 13r for accommodating the booster pump 13, and other configurations are substantially the same as those of the first embodiment shown in FIGS. 11 to 13, the same parts as those in the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIGS. 11 to 13, the first oil tank 11 has a sealed booster pump chamber 13r for accommodating the booster pump 13, and the booster pump chamber 13r
An oil discharge mechanism that discharges the oil in the booster pump chamber 13r to the first oil tank 11 is provided on the wall surface W. Specifically, as shown in FIGS. 11 and 12, a drain hole 51 and a damper valve 52 are formed in the wall surface W of the booster pump chamber 13 r.
Are provided. A float 53 is fixed to the damper valve 52. As shown in FIG. 13, when the float 53 floats, the damper valve 52 opens. A hydraulic adjustment valve 13a for adjusting the hydraulic pressure of the booster pump 13 is housed in the booster pump chamber 13r, and a manhole 11m for operating the hydraulic adjustment valve 13a.
Is provided above the booster pump chamber 13r.

In the steam turbine lubricating oil supply device 10 shown in FIGS. 11 to 13, even if the manhole 11m is opened and closed,
The inflow of outside air is limited to the inside of the closed booster pump chamber 13r, and outside air does not flow into any part other than the booster pump chamber 13r. Therefore, the negative pressure state in the bearing chamber 60 is maintained. Further, when the lubricating oil O leaks from the oil pipe or the like of the booster pump 13 in the sealed booster pump chamber 13r, the oil is discharged through the drain hole 51. If the lubricating oil O leaks so rapidly that it cannot be handled by the drain hole 51, the lubricating oil will accumulate in the booster pump chamber 13r. 52 is opened, and the lubricating oil O is discharged from the damper valve 52. This prevents the leaked lubricating oil from being discharged by the oil discharging mechanism and filling the booster pump chamber 13r, so that the lubricating oil O may overflow when the manhole 11m of the booster pump chamber 13r is opened. Avoided reliably.

As described above, according to the present embodiment, the negative pressure state of the bearing chamber 60 can be maintained irrespective of the opening / closing operation of the manhole 11m, so that the danger of ignition and smoke due to leakage of the lubricating oil can be more reliably avoided. it can. Further, even when the lubricating oil leaks in the sealed booster pump chamber 13r, the leaked oil is discharged by the oil discharging mechanism, so that the lubricating oil O overflows when the manhole 11m of the booster pump chamber 13r is opened. You can avoid getting out.

The configuration in which the booster pump chamber 13r is provided as in the present embodiment is not limited to a two-tank type lubricating oil supply device having a first oil tank and a second oil tank. It is also applicable to a lubricating oil supply device for a tank type tank.

[0057]

As described above, according to the present invention, when the manhole or the like of the first oil tank is opened, the gas flows from the manhole or the like by closing the gas flow control valve provided in the gas communication pipe. Since the outside air can be shut off by the gas flow control valve and the negative pressure state in the bearing chamber can be maintained,
Leakage of lubricating oil from the oil drain seal is prevented.

According to the present invention, when the manhole or the like of the first oil tank is opened, the oil injection valve is opened and the lubricating oil in the tank is transferred from the oil introduction pipe to the U-shaped gas communication pipe. By introducing the gas, the U
A seal is formed, and the U-seal shuts off the outside air flowing from a manhole or the like. Therefore, a negative pressure state in the bearing chamber can be maintained, and leakage of lubricating oil from the oil drain seal can be prevented.

Further, according to the present invention, since the booster pump chamber accommodating the booster pump is sealed, even if the manhole of the booster pump chamber is opened, the negative pressure state in the bearing chamber can be maintained, and the oil pressure can be maintained. Leakage of lubricating oil from the cut seal is prevented. Furthermore, even if lubricating oil leaks in the enclosed booster pump chamber, the oil draining mechanism discharges the leaked oil, thus avoiding overflow of the lubricating oil when opening the manhole of the booster pump chamber. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment of a steam turbine lubricating oil supply device according to the present invention.

FIG. 2 is an enlarged view of a gas communication pipe portion in FIG.

FIG. 3 is an enlarged view of a bearing chamber portion in FIG. 1;

FIG. 4 is an enlarged view of an oil drain seal portion in FIG. 3;

FIG. 5 is a sectional view showing a gas communication pipe part of a second embodiment of the steam turbine lubricant supply device according to the present invention.

FIG. 6 is a sectional view showing a gas communication pipe portion of a third embodiment of a steam turbine lubricating oil supply device according to the present invention (a gas flow control valve is open).

FIG. 7 is a sectional view showing a gas flow control valve portion of a third embodiment of the steam turbine lubricating oil supply device according to the present invention.

FIG. 8 is a sectional view showing a gas communication pipe portion of a steam turbine lubricating oil supply device according to a third embodiment of the present invention (a gas flow control valve is closed).

FIG. 9 is a cross-sectional view showing a gas connecting pipe portion of a steam turbine lubricating oil supply device according to a fourth embodiment of the present invention (in a state where a gas connecting pipe portion is open).

FIG. 10 is a cross-sectional view showing a gas communication pipe portion of a steam turbine lubricating oil supply device according to a fourth embodiment of the present invention (in a state where a gas connection pipe portion is closed).

FIG. 11 is a sectional view showing a booster pump chamber portion of a steam turbine lubricating oil supply device according to a fifth embodiment of the present invention.

FIG. 12 is a perspective view showing a booster pump chamber portion of a steam turbine lubricating oil supply device according to a fifth embodiment of the present invention.

FIG. 13 is a schematic view showing the operation of the float of the fifth embodiment of the steam turbine lubricant supply device according to the present invention.

FIG. 14 is a sectional view showing a conventional steam turbine lubricating oil supply device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steam turbine 2 Rotating shaft 10 Steam turbine lubricating oil supply device 11 1st oil tank 11m Manhole 11b Operating lever 12 2nd oil tank 13 Booster pump 13a Hydraulic pressure regulating valve 13r Booster pump room 14 Turning oil pump 15 Oil cooler 17 Oil supply Pipe 18 oil return pipe 20 oil communication pipe 25 gas communication pipe 25c conical inner circumference 26 gas flow control valve 26b operating lever 27 gas extractor 28 lever connecting rod 30 cylindrical member 30a end face 30c conical outer circumference 30p cylindrical outer circumference Portion 30h Through-hole 30e End of through-hole 31 Parallel annular guide 35 Elastic spring 36 Spring mounting plate 41 Oil introduction pipe 42 Oil discharge valve 43 Oil injection valve 44 Oil discharge pipe 51 Drain hole 52 Damper valve 53 Float 60 Bearing chamber 61 Bearing 63 Oil seal 80 Steam turbine lubricant supply 81 first oil tank 82 the second oil reservoir 83 booster pump 84 turning oil pump 85 oil cooler 87 the oil supply pipe 88 oil return pipe 90 bearing chamber 91 Bearing

Claims (5)

[Claims] An oil supply pipe for connecting a bearing chamber containing a steam turbine bearing, a first oil tank having a booster pump, a second oil tank, and a bearing chamber to a booster pump in the first oil tank. An oil return pipe connecting the bearing chamber and the second oil tank; an oil communication pipe connecting the lower part of the first oil tank and the lower part of the second oil tank; an upper part of the first oil tank and a second oil A lubricating oil supply device for a steam turbine, comprising: a gas communication pipe connecting an upper part of a tank; and a gas flow control valve provided in the gas communication pipe. The first oil tank has an openable and closable manhole provided on an outer wall of the first oil tank and having an operation lever attached thereto, and the gas flow control valve is provided for opening and closing the gas flow control valve. The steam turbine lubricating oil supply device according to claim 1, further comprising an operating lever, wherein the operating lever and the operating lever are connected by a lever connecting rod. 3. A gas flow control valve comprising: a cylindrical member having a conical outer peripheral portion and a through hole extending in an axial direction; one end connected to the end of the cylindrical member and the other end supported by a gas communication pipe; The gas turbine according to claim 1, wherein the gas communication pipe has a conical inner peripheral portion engageable with a conical outer peripheral portion of the tubular member. Oil supply device. 4. An oil supply pipe connecting a bearing chamber containing a steam turbine bearing, a first oil tank having a booster pump, a second oil tank, and the bearing chamber to a booster pump in the first oil tank. An oil return pipe connecting the bearing chamber and the second oil tank; an oil communication pipe connecting the lower part of the first oil tank and the lower part of the second oil tank; an upper part of the first oil tank and a second oil A gas connecting pipe connecting the upper part of the tank and the gas connecting pipe, wherein the gas connecting pipe is formed in a U-shape having a bottom portion lower than the oil level of the first oil tank or the second oil tank. A lubricating oil supply device for a steam turbine, wherein an oil inlet pipe having an oil discharge valve and communicating with at least one of the first oil tank and the second oil tank is provided at the bottom of the oil supply pipe. 5. A bearing chamber containing a steam turbine bearing, an oil tank having a booster pump, an oil supply pipe connecting the bearing chamber and a booster pump in the oil tank, and connecting the bearing chamber and the oil tank. The oil tank has a sealed booster pump chamber for accommodating the booster pump, and discharges the oil in the booster pump chamber to the oil tank on the wall surface of the booster pump chamber according to the oil level. A lubricating oil supply device for a steam turbine, comprising: