JPH11117708A - Turbine oil flushing passage switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbine oil flushing passage switching device which is capable of being installed even in a limited narrow space around a turbine generator and which has a large flow passage area for lubricating oil. SOLUTION: When oil flushing is performed, a switching device body 36 is attached to the end flange 35 of an orifice strainer, and the supply of lubricating oil to a bearing is closed-down by a close-down part or a compact valve element 17. That is, a valve element driving part drives the compact valve element 17 up to the position at which the supply of lubricating oil to the bearing is closed-down. Then, at the time of oil flushing, lubricating oil is supplied to a flushing pipe 19 of the switching device body 36.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbine oil flushing flow path switching device for switching a lubricating oil flow path when performing oil flushing for cleaning lubricating oil of a turbine bearing lubricating oil device. .

[0002]

2. Description of the Related Art Generally, lubricating oil is supplied to a turbine bearing from a turbine bearing lubricating oil device so that a turbine shaft rotates smoothly. FIG. 7 shows a conventional turbine bearing lubricating oil device. In FIG. 7, a plurality of turbines 1a to 1d (here, four turbines 1 are shown)
Are connected by a turbine shaft 2 (a plurality of turbine shafts are connected), and each of the turbines 1a to 1d is supported by a plurality of bearings 3 and rotates.

[0003] Lubricating oil is supplied between the turbine shaft 2 and the bearing 3. This lubricating oil is stored in an oil tank 4, pumped up by an oil pump 5, and
, And is supplied to each bearing 3 via an orifice strainer 8. Then, the lubricating oil is supplied to the inside of the bearing 3 through the inside of the bearing 3, and is returned to the oil tank 4 through the return oil mother pipe 12. In this case, at the inlet of the oil tank 4, the lubricating oil is collected while constantly capturing a large foreign substance via the return oil strainer 16.

[0004] Here, the turbine shaft 2 and the bearing 3 are constituted by a minute gap, and the lubricating oil supplied to the bearing 3 returns to the oil mother pipe 12 from this gap. FIG. 8 is a detailed view of a portion of the turbine shaft 2 and the bearing 3. FIG. 8A shows the front side of the turbine shaft 2 together with the flow of lubricating oil, and FIG. 8B shows the side surface of the turbine shaft 2 together with the flow of lubricating oil.

As shown in FIG. 8, a turbine shaft 2 and a bearing 3
The lubricating oil that has flowed out of the gap is collected under the bearing stand 9,
It is guided to the return oil mother pipe 12 by the bearing stand return oil pipe 11.
Then, the structure returns to the oil tank 4. That is, the lubricating oil returned from the bearing 3 is recovered to the oil tank 4 by a difference in head between the bearing 3 and the oil tank 4. The upper part of the bearing stand 9 is sealed with a bearing cover 10 for sealing so that lubricating oil does not scatter. In FIG. 8, the oil supply mother pipe 6 and the return oil mother pipe 12 are shown in a double pipe structure to save piping space.

Next, FIG. 9 shows a configuration of the orifice strainer 8. The orifice strainer 8 is provided between the bearing oil supply pipe 7 from the oil supply mother pipe 6 and the bearing 3, and is installed for each bearing 3. The orifice strainer 8 has a built-in strainer 14 for preventing foreign matter from flowing into the bearing 3 of the turbine 1 and an orifice 13 for regulating oil distribution to the bearing 3. The strainer 14 is for preventing foreign matter from flowing in during turbine operation, and is a relatively coarse strainer. This is because the provision of a thin strainer tends to cause clogging and shortage of the bearing lubrication amount. In other words, this is to prevent a situation in which the bearing lubrication amount is insufficient.
The orifice strainer lid 15 is opened to exchange the strainer 14 with a flushing strainer during oil flushing.

When the turbine 1 is opened and disassembled, the bearing base cover 10 is opened, the bearing 3 is removed, and the turbine shaft 2 is taken out. Assembly is the reverse of this procedure. After the turbine 1 is opened and disassembled, the turbine 1 is assembled.
Minute foreign substances mixed into the inside, oil supply mother pipe 6, bearing oil supply pipe 7,
It is necessary to remove foreign matter from the bearing base return oil pipe 11 and the return oil mother pipe 12.

Therefore, an oil flushing operation is performed to maintain the cleanliness of the lubricating oil at a specified value. This is because the coarse strainer is used for the orifice strainer 8 during the operation of the turbine.
This is to remove in advance foreign substances that pass through. That is, it is to prevent foreign matter that passes through the coarse strainer 14 from flowing into the bearing 3 of the turbine 1. This prevents the turbine shaft 2 and the bearing 3 from being damaged.

As a method of reliably performing the oil flushing in a short period of time, a turbine oil flushing flow path switching device for switching a lubricating oil flow path to an orifice strainer 8 provided for each of a plurality of bearings 3 is provided. It is provided and connected to a detachable washing pipe.

FIG. 10 shows a conventional oil flushing flow path switching device. After the internal structure of the orifice strainer 8 is removed, the oil flushing flow path switching device is attached to the end flange 35 of the orifice strainer 8 as a temporary oil flushing product. The branch pipe 39 of the orifice strainer 8 is connected to the oil supply pipe 7, and lubricating oil is supplied from the oil supply pipe 7. And
The lubricating oil is introduced into the bearing stand 9 through the temporary cleaning pipe 19.

The oil flushing flow path switching device includes a switching device main body having a cleaning pipe 19 attached to the end flange 35 of the orifice strainer 8 for supplying lubricating oil for cleaning the bearing stand 9 during oil flushing. 36, a compact valve element 17 inserted into the orifice strainer 8 from the switching device main body 36 side, and the valve element 1 thereof.
In the case of oil flushing, the supply of the lubricating oil to the bearing 3 is closed and the lubricating oil is removed from the cleaning pipe 1 during oil flushing.
9 and a valve for driving the valve 17 to a position where the supply of lubricating oil to the bearing 3 is closed at the time of oil flushing, which is provided at the end of the valve rod 23 to which the valve 17 is attached. And a valve body drive unit 18.

That is, the switching device main body 36 is attached to the end flange 35 of the orifice strainer 8 by bolting, and the valve stem 23 of the closing portion 42 is rotated on the opposite side of the switching device main body 36 so that the valve element 17 is moved to the orifice. The valve drive unit 43 is provided which can be moved until it comes into close contact with the valve seat 34 provided inside the strainer 8.

The valve body driving section 18 has a handle 40 for rotating the valve stem 23 via a bonnet 37, and the handle 40 moves the valve body 17 to a valve seat 34 installed inside the orifice strainer 8. Move until close contact. A gland packing is provided to prevent oil leakage from the rotating parts of the bonnet 37 and the valve stem 23.

[0014]

However, in such a conventional turbine oil flushing flow path switching device, the valve drive unit 18 for opening and closing the valve 17 is large and heavy. For this reason, it is difficult to install the orifice strainer 8 in the vicinity of the existing turbine / generator bearing where the equipment, piping, and instrumentation are complicated.

Further, the valve element 17 of the turbine oil flushing flow path switching device attached to the orifice strainer 8 for closing the existing flow path on the lubricating oil pipe side and guiding the lubricating oil to the temporary washing pipe 19 is provided with oil. It has a structure that is large enough to block the lubricating oil flow path during flushing.
That is, the valve element 17 has a general ball-shaped valve structure, which is larger than the size of the orifice strainer 8 and partially obstructs the flow path of the lubricating oil for oil flushing flowing in from the upstream of the orifice strainer 8. ing. Therefore, the function of flowing a large flow rate necessary for performing the periodical and efficient operation of the oil flushing has been hindered.

Further, since the turbine oil flushing flow path switching device has the bonnet 37 and the handle 40, the external shape becomes large, and the turbine oil flushing flow path switching device may not be attached to the orifice strainer 8. . The overall weight is also heavy,
A great deal of effort has been expended in mounting to the orifice strainer 8.

Furthermore, the oil flushing device including the cleaning pipe 19 has no oil draining function, and a great deal of labor has been spent on draining the lubricating oil remaining in the oil flushing device after the oil flushing is completed.

It is an object of the present invention to provide a turbine oil flushing flow path switching device which can be installed in a limited narrow space around a turbine generator and has a large lubricating oil flow area.

[0019]

According to a first aspect of the present invention, there is provided a turbine oil flushing flow switching device for supplying lubricating oil mounted on an end flange of an orifice strainer for cleaning a bearing stand during oil flushing. The switching device main body with the cleaning pipe of (1), and the compact valve element inserted into the orifice strainer from the switching device main body side. In the case of oil flushing, shut off the supply of lubricating oil to the bearing to clean the lubricating oil. A closing part leading to the piping for
A valve drive unit is provided at the end of the valve rod to which the valve is attached, and drives the valve to a position where the supply of lubricating oil to the bearing is closed in the case of oil flushing.

In the turbine oil flushing flow path switching device according to the first aspect of the present invention, the switching device main body is attached to the end flange of the orifice strainer at the time of oil flushing, and at the time of oil flushing by the compact valve body which is the closing portion. Close the lubrication oil supply to the bearing. In other words, the valve drive unit drives the compact valve to a position where the supply of lubricating oil to the bearing is closed. Then, at the time of oil flushing, lubricating oil is supplied to the cleaning pipe of the switching device main body.

According to a second aspect of the present invention, there is provided a turbine oil flushing flow path switching device according to the first aspect of the invention.
A coil spring is provided at an end of a valve rod to which a valve element is attached instead of the valve element driving section, and the valve element is fixed by a coil spring at a position where supply of lubricating oil to a bearing is closed.

In the turbine oil flushing flow path switching device according to the second aspect of the present invention, in addition to the operation of the first aspect, the valve body is fixed at a position where the supply of lubricating oil to the bearing is closed by a coil spring.

According to a third aspect of the present invention, there is provided a turbine oil flushing flow path switching device according to the first aspect of the present invention.
A spring washer is provided at an end of a valve rod to which a valve body is attached in place of the valve body drive unit, and the valve body is fixed at a position where supply of lubricating oil to a bearing is closed by a spring washer. .

According to a third aspect of the present invention, in addition to the operation of the first aspect, the valve body is fixed at a position where the supply of lubricating oil to the bearing is closed by a spring washer. .

According to a fourth aspect of the present invention, there is provided a turbine oil flushing flow path switching device according to the first aspect of the present invention.
A plate screw is provided at the end of the valve rod to which the valve body is attached in place of the valve body drive unit, and the valve body is fixed at a position where the supply of lubricating oil to the bearing is closed with the plate screw. .

In the turbine oil flushing flow path switching device according to a fourth aspect of the present invention, in addition to the function of the first aspect of the present invention, the valve body is fixed at a position where the supply of lubricating oil to the bearing is closed by a plate screw. .

According to a fifth aspect of the present invention, there is provided a turbine oil flushing flow path switching device according to the first aspect of the present invention.
A bolt screw is provided at the end of the valve rod to which the valve element is attached instead of the valve element driving section, and the valve element is fixed with a bolt screw at a position where supply of lubricating oil to the bearing is closed.

According to a fifth aspect of the present invention, there is provided a turbine oil flushing flow path switching device according to the first aspect of the present invention.
A bolt screw is provided at the end of the valve rod to which the valve element is attached instead of the valve element driving section, and the valve element is fixed with a bolt screw at a position where supply of lubricating oil to the bearing is closed.

According to a sixth aspect of the present invention, in the turbine oil flushing flow path switching device according to any one of the first to fifth aspects, after the oil flushing is completed, the turbine oil flushing flow passage switching device is installed in the switching device main body and the cleaning pipe. The drainage pipe for discharging the retained lubricating oil is provided.

In the turbine oil flushing flow path switching device according to the sixth aspect of the present invention, in addition to the functions of the first to fifth aspects of the present invention, after the oil flushing is completed, the switching device main body and the cleaning pipe are provided. The accumulated lubricating oil is discharged from the drain pipe.

[0031]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of a turbine oil flushing flow path switching device according to a first embodiment of the present invention.
In the first embodiment, as compared with the conventional example shown in FIG. 10, the valve body 17 of the closing portion 42 can secure the flow area of the lubricating oil for oil flushing and increase the efficiency of oil flushing. This is a compact valve element 17. In FIG. 1, the illustration of the valve body driving unit 18 is omitted.

In FIG. 1, the valve element 17 is provided with the cleaning pipe 1.
It is designed in a compact shape so as not to obstruct the flow path for supplying the lubricating oil to the 9 side. That is, the valve stem 23 is penetrated through the valve element 17, and the Teflon sheet 20 is fitted into the valve element 17. Then, the Teflon sheet 20 is fastened to the valve body 17 with the stopper plate 21 and the nut 22.
At the time of oil flushing, the Teflon sheet 2
0 and close the existing lubricating oil pipe side.

With such a valve element 17, when the lubricating oil from the oil supply pipe 7 is introduced through the branch pipe 39, the valve element is configured to be small, so that the flow path of the lubricating oil is obstructed. Absent. That is, since the flow of the lubricating oil guided to the cleaning pipe 19 is not obstructed by the valve body 17, the pressure loss when the lubricating oil passes can be reduced. That is,
A large amount of lubricating oil required for oil flushing can be supplied. As a result, the time efficiency of oil flushing can be increased, and it also contributes to the effect of removing foreign substances.

Next, a second embodiment of the present invention will be described. FIG. 2 is an explanatory diagram of a turbine oil flushing flow path switching device according to a second embodiment of the present invention. This second embodiment is different from the first embodiment shown in FIG. 1 in that a coil spring 24 and a closing member are provided at the end of a valve rod 23 to which a valve element 17 is attached, instead of the valve element driving section 18. Board 41
Is provided. Then, the coil spring 24 is held by the closing plate 41, and the valve element 17 is fixed at a position where the supply of the lubricating oil to the bearing 3 is closed. In FIG. 2, the illustration of the valve element 17 is omitted.

In FIG. 2, the valve element 17 for closing the flow path of the lubricating oil pipe to the bearing 3 is supported by a coil spring 24 to which a pressing force is applied by a closing plate 41 on the end face.
That is, the valve body 17 is closed by tightening it with the closing plate 41.
4 are provided. Then, the coil spring 24 is inserted into the end of the valve stem 23, held by the projection 23A, and closed by tightening the closing plate 41 on the end face.
A recess 41A is provided at the center of the closing plate 41 so that the coil spring 24 is fixed.

This eliminates the need to provide a handle 40, a bonnet 37, a gland packing, and the like for adjusting and fixing the position of the valve element 17 for closing the lubricating oil pipe side of the orifice strainer 8 to the bearing 3 of the orifice strainer 8. A compact turbine oil flushing flow path switching device can be provided.

Next, a third embodiment of the present invention will be described. FIG. 3 is an explanatory view of a turbine oil flushing flow path switching device according to a third embodiment of the present invention. The third embodiment differs from the first embodiment shown in FIG. 1 in that a spring washer 28 and a spring washer 28 are provided at the end of a valve stem 23 to which a valve element 17 is attached, instead of the valve element driving section 18. A closing plate 41 is provided. Then, the spring washer 28 is held by the closing plate 41, and the valve body 17 is fixed at a position where the supply of the lubricating oil to the bearing 3 is closed. In addition, illustration of the valve element 17 is omitted in FIG.

In FIG. 3, a spring washer 28 is used instead of inserting the coil spring 24 in the first embodiment, and the closing method is as described above by closing the spring washer 28 by tightening the end face closing plate 41. . That is, the bearing 3
The valve element 17 that closes the flow path of the lubricating oil pipe to the valve is supported by a spring washer 28 to which a pressing force is applied by a closing plate 41 on the end surface. The closing plate 41 is provided with a convex portion 41B for pressing the spring washer 28.

Next, a fourth embodiment of the present invention will be described. FIG. 4 is an explanatory view of a turbine oil flushing flow path switching device according to a fourth embodiment of the present invention. The fourth embodiment differs from the first embodiment shown in FIG. 1 in that a plate screw 30 and a plate screw 30 are attached to the end of a valve stem 23 to which a valve element 17 is attached, instead of the valve element driving section 18. A closing plate 41 is provided. Then, the leaf spring 30 is formed by the closing plate 41.
And the valve element 17 is fixed at a position where the supply of the lubricating oil to the bearing 3 is closed. In FIG. 4, the illustration of the valve element 17 is omitted.

In FIG. 4, the valve element 17 is tightly closed to the valve seat 34 by tightening the screw portion 29 of the plate screw 30 to the screw portion 29 on the closing portion 41 side. That is, a plate screw 3 in which a screw is cut at the end of the valve stem 23
0 is attached, and a concave portion 31 is provided at an end of the plate screw 30.
Then, a tool or the like is inserted into the concave portion 31 and rotated to move and close the valve element 17. When the closing operation is completed, the lid is closed with the closing plate 41 on the end face. in this way,
In the fourth embodiment, the valve element 17 for closing the flow path of the lubricating oil pipe to the bearing 3 is supported by the plate screw 30 to which a pressing force is applied by the closing plate 41 on the end face.

Next, a fifth embodiment of the present invention will be described. FIG. 5 is an explanatory diagram of a turbine oil flushing flow path switching device according to a fifth embodiment of the present invention. This fifth embodiment is different from the first embodiment shown in FIG. 1 in that a bolt screw 43 and a closing screw are provided on the end of a valve stem 23 to which a valve element 17 is attached, instead of the valve element driving section 18. Board 41
Is provided. Then, the valve rod 23 is held by the bolt screw 43 via the closing plate 41, and the valve body 17 is fixed at a position where the supply of the lubricating oil to the bearing 3 is closed. In FIG. 5, the illustration of the valve element 17 is omitted.

Referring to FIG. 4, the fifth embodiment is different from the fifth embodiment in that:
The valve element 17 is brought into close contact with the valve seat 34 and closed by rotating the bolt screw 43. That is, the valve stem 2
The end of 3 and the closing plate 41 are threaded, and the valve rod 17 is moved by rotating the valve rod 23 to close the lubricating oil pipe to the bearing 3. Further, the insertion of the washer 32 and the seal packing 33 prevents the lubricating oil from leaking to the outside. As described above, in the fifth embodiment, the valve element 17 that closes the flow path of the lubricating oil pipe to the bearing 3 is provided with the bolt screw 4 that is pressed by the closing plate 41 on the end face.
3 supported.

Next, a sixth embodiment of the present invention will be described. FIG. 6 is an explanatory view of a turbine oil flushing flow path switching device according to a sixth embodiment of the present invention. This sixth embodiment is different from the second embodiment shown in FIG. 2 in that the lubricating oil retained in the switching device main body 36 and the cleaning pipe 19 is discharged to the oil tank 4 after the completion of the oil flushing. Is provided. In FIG. 5, the illustration of the valve element 17 is omitted.

Referring to FIG. 6, the sixth embodiment is
In contrast to the second embodiment shown in FIG.
6 is additionally provided with a drain seat 25, a drain pipe 26, and a stop valve 27. With this arrangement, the oil retained in the orifice strainer 8 and the cleaning pipe 19 after the oil flushing is completed is fully opened. The oil is collected in the oil tank 4.

As described above, the drain drain pipe 26 for draining oil is connected to the lower portion of the switching device main body 36, and is guided to the oil tank 4. Therefore, after the oil flushing is completed, the orifice strainer 8 is closed. Drainage and removal can be performed easily and quickly.

[0046]

As described above, according to the present invention, since the valve body is made compact, the flow of the lubricating oil for oil flushing is not obstructed at the time of oil flushing, and more oil flows than usual. be able to.
That is, the flow velocity can be increased, and the oil flushing effect can be enhanced. Furthermore, the flushing period is greatly reduced. In addition, the valve drive unit is simplified and reduced in weight by simplifying the valve drive unit, and can be easily and quickly mounted even in a narrow place where devices, piping, and instrumentation are complicated.

Further, a drain pipe is provided in the orifice strainer, and the oil remaining in the orifice strainer and the washing pipe after the oil flushing can be collected in the oil tank without spilling on the floor surface and can be easily removed. . In this way, by collecting the oil, it is possible to shorten the period until the main unit is restored after the oil flushing, and it is possible to prevent the risk of a fire or the like in advance.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a second embodiment of the present invention.

FIG. 3 is an explanatory view of a third embodiment of the present invention.

FIG. 4 is an explanatory diagram of a fourth embodiment of the present invention.

FIG. 5 is an explanatory diagram of a fifth embodiment of the present invention.

FIG. 6 is an explanatory view of a sixth embodiment of the present invention.

FIG. 7 is an explanatory view of a conventional turbine bearing lubricating oil device.

FIG. 8 is a detailed view of a turbine shaft and a bearing portion according to a conventional example.

FIG. 9 is an explanatory view of a conventional orifice strainer.

FIG. 10 is an explanatory view of a conventional turbine oil flushing flow path switching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turbine 2 Turbine shaft 3 Bearing 4 Oil tank 5 Oil pump 6 Oil supply pipe 7 Oil supply pipe 8 Orifice strainer 9 Bearing stand 10 Bearing stand cover 11 Bearing stand return oil pipe 12 Return oil pipe 13 Orifice 14 Strainer 15 Orifice strainer lid 16 Return Oil strainer 17 Valve element 18 Valve element drive unit 19 Cleaning pipe 20 Teflon sheet 21 Stop plate 22 Nut 23 Valve rod 24 Coil spring 25 Drain seat 26 Drain extraction pipe 27 Stop valve 28 Spring washer 29 Screw part 30 Plate screw 31 Depression 32 Washer 33 Packing 34 Valve seat 35 End flange 36 Switching device body 37 Bonnet 39 Branch pipe 40 Handle 41 Closing plate 42 Closing part 43 Bolt screw

Claims (6)

[Claims] 1. A lubricating oil is supplied from an oil tank storing lubricating oil to be supplied to a plurality of bearings of a turbine to the bearing via an orifice strainer, and the lubricating oil supplied to the bearing is passed through a bearing stand. In a turbine oil flushing flow switching device for switching a lubricating oil flow path when performing oil flushing by replacing a strainer in the orifice strainer of the turbine bearing lubricating oil device that is returned to an oil tank with a flushing strainer, A switching device main body having a cleaning pipe attached to an end flange of the orifice strainer at the time of flushing for supplying lubricating oil for cleaning the bearing pedestal, and inserted into the orifice strainer from the switching device main body side. When the oil flushing is used, the bearing A closing portion for closing the supply of the lubricating oil and guiding the lubricating oil to the cleaning pipe; and a lubricating oil supply to the bearing provided at an end of a valve stem to which the valve body is attached, in the case of oil flushing. A turbine oil flushing flow path switching device, comprising: a valve element drive unit for driving the valve element to a position where the valve element closes. 2. A coil spring is provided at an end of a valve stem to which said valve element is attached in place of said valve element driving section, and said valve element is provided with said coil spring at a position where supply of lubricating oil to said bearing is closed. The turbine oil flushing flow path switching device according to claim 1, wherein the switching device is fixed. 3. A spring washer is provided at an end of a valve stem to which the valve body is attached in place of the valve body drive unit, and the valve body is provided at a position where the supply of lubricating oil to the bearing is closed. The turbine oil flushing flow path switching device according to claim 1, wherein the device is fixed by a washer. 4. A plate screw is provided at an end of a valve stem to which said valve element is attached in place of said valve element driving section, and said valve element is placed at a position where supply of lubricating oil to said bearing is closed. The turbine oil flushing channel switching device according to claim 1, wherein the device is fixed by screws. 5. A bolt screw is provided at an end of a valve stem to which said valve element is attached in place of said valve element driving section, and said valve element is set at a position where supply of lubricating oil to said bearing is closed. The turbine oil flushing flow path switching device according to claim 1, wherein the switching device is fixed. 6. The draining pipe for discharging the lubricating oil retained in the switching device main body and the cleaning pipe after the completion of the oil flushing, is provided. 2. The turbine oil flushing flow path switching device according to claim 1.