JP4139568B2 - Vertical valve turbine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vertical valve turbine installed in a flow channel, and more particularly to a bearing device for a vertical valve turbine .
[0002]
[Prior art]
A conventional turbine bearing device for a vertical valve turbine installed in a water channel is an oil lubrication method using a cylindrical metal or a segment metal. For this reason, a bearing oil tank containing lubricating oil is required, and the structure is complicated, such as circulating and cooling the oil in the bearing oil tank to prevent the bearing temperature from rising. Furthermore, a drainage device having a piping system for guiding water leakage from the main shaft sealing portion to the outside is required.
[0003]
[Problems to be solved by the invention]
In recent years, there are an increasing number of plans for vertical valve turbines that are advantageous for securing construction sites for power plants and reducing civil engineering costs such as excavation costs.
[0004]
However, the conventional water turbine bearing device for a vertical valve turbine has a problem in that it is difficult to perform maintenance and inspection because the structure is complex and the space is narrow because the oil lubrication method of oil self-contained or oil circulation method is used. It was.
[0005]
The present invention has a water-lubricating structure using ceramics for the main shaft sealing part and the water wheel bearing part, and further a drainage system using gravity, thereby simplifying the structure and providing a bearing for a vertical valve water wheel excellent in maintainability. A device is provided.
[0006]
[Means for Solving the Problems]
A bearing device for a vertical valve turbine according to the present invention is a vertical valve turbine installed in a flow channel, and includes a main shaft sealing device for a ceramic seal, a turbine bearing using ceramics for a sliding portion, and a protruding from the turbine bearing. In order to drain water, it has a number of guide vanes with drain holes in the axial center.
[0007]
Further, a drainage device for guiding water discharged from the guide vane to the outside and a water level detector for detecting the water level staying in the upper part of the bearing are provided.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a vertical sectional view of a vertical valve turbine equipped with a bearing device of the present invention. The valve 1 is an outer shell housing a water turbine and a generator, and is installed on a foundation cradle 4 embedded in a concrete foundation structure 3 by a support arm 2 formed in a cross shape. Reference numeral 5 denotes a generator stator, and the rotor 6 is fixed to the main shaft 7. A runner 8 is attached to the tip of the main shaft 7, and a guide vane 9 is arranged along the circumference on the upstream side thereof, and has a function of changing the opening degree through the guide ring 10 and adjusting the flow rate to the runner 8. ing.
[0009]
A rotating portion including the rotor 6, the main shaft 7, and the runner 8 is supported by a thrust bearing 11, a generator bearing 12, and a water wheel bearing 13. In addition to the weight of the rotating parts of the turbine and the generator, a large thrust is applied to the thrust bearing 11 due to running water applied to the runner 8 and the like during operation of the vertical valve turbine. 14 is a main shaft sealing device which is one of the components of the present invention, and 15 is a conical water turbine lower cover which forms a water surface. Reference numeral 16 denotes an outer guide vane ring in which a guide vane bearing portion is provided, 17 denotes an inner guide vane ring in which the other guide vane bearing portion is provided, and 18 denotes a discharge ring that forms a flow channel of the runner 8.
[0010]
An inspection shaft 19 is a passage through which an operator enters and exits to inspect equipment in the valve 1 and can be removed when the vertical valve turbine is assembled or disassembled. Reference numeral 20 denotes an anti-vibration stay attached between the valve 1 and the concrete foundation structure 3 in order to suppress vibration during operation of the vertical valve turbine.
[0011]
FIG. 2 is a structural diagram around the main shaft sealing device 14 and the water turbine bearing 13. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals. The ceramic seal part 21 of the main shaft sealing device 14 is pressed against the sliding ring 23 attached to the flange 22 of the main shaft 7 by a spring (not shown) and the flowing water pressure acting to seal the flowing water. The amount of water passing through the seal portion can be changed by adjusting the spring, but the water exiting the seal portion flows into the lower chamber 24 of the water turbine bearing 13.
[0012]
The ceramic bearing 25 is positioned by an adjusting bolt 27 attached to the bearing base 26, and an appropriate bearing gap is maintained between the ceramic bearing 25 and the ring 28 fitted to the main shaft 7.
[0013]
The water in the lower chamber 24 of the water turbine bearing 13 enters the bearing gap portion, plays a role of water lubrication and cooling, and flows into the upper chamber 29. A conical bearing cover 30 has a water passage hole 31 and suppresses the undulation of the water surface in the upper chamber 29 due to the rotation of the main shaft 7. Reference numeral 32 denotes a drainage hole provided in the axial center portion of the guide vane 9 and guides the accumulated water in the bearing upper chamber 29 to the drainage pipe 33 and drains it to the outside. Reference numeral 34 denotes a water level detector, which is provided in order to detect an alarm notification or the like when the water level in the bearing upper chamber 29 rises abnormally due to clogging of the drain hole 32 or the like.
[0014]
In the present invention, regardless of the operation of the vertical valve water turbine, the flowing water that has passed through the ceramic main shaft sealing portion 14 performs water lubrication and cooling functions of the ceramic turbine wheel bearing portion 13 from the rear bearing upper chamber 29 to the guide vane. 9 is drained to the outside by a drain hole 32 provided in the shaft center portion, and no special drainage device or cooling device is required. Therefore, there is an advantage that the structure is simple and maintenance-free. In addition, it is also possible to provide a suction pipe in the bearing upper chamber 29 without providing a drain hole in the guide vane 9, and to drain the outside with a drain pump installed separately.
[0015]
【The invention's effect】
The bearing device of the vertical valve turbine according to the present invention performs water lubrication and cooling of the ceramic turbine bearing 13 by the flowing water that has passed through the ceramic sealing device 14, so that it is not necessary to supply water from the outside. Further, the water coming out of the sliding surface of the water wheel bearing is drained from the bearing upper chamber 29 to the outside through the drain hole 32 provided in the shaft center portion of the guide vane 9, so that the drainage system is simplified and maintenance inspection is easy. A bearing device for a vertical valve turbine can be provided.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view including a bearing device for a vertical valve turbine according to the present invention.
FIG. 2 is a structural view around a turbine bearing of a vertical valve turbine according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Valve | bulb, 2 ... Support arm, 3 ... Concrete foundation structure, 4 ... Foundation cradle, 5 ... Stator, 6 ... Rotor, 7 ... Main shaft, 8 ... Runner, 9 ... Guide vane, 10 ... Guide ring, DESCRIPTION OF SYMBOLS 11 ... Thrust bearing, 12 ... Generator bearing, 13 ... Turbine bearing, 14 ... Main shaft sealing device, 15 ... Watermill lower cover, 16 ... Outer guide vane ring, 17 ... Inner guide vane ring, 18 ... Discharge ring, 19 ... Inspection shaft, 20 ... Vibration-proof stay, 21 ... Ceramic seal part, 22 ... Flange, 23 ... Sliding ring, 24 ... Lower wheel bearing, 25 ... Ceramic bearing, 26 ... Bearing stand, 27 ... Adjustment bolt, 28 ... Ring , 29 ... water turbine bearing upper chamber, 30 ... bearing cover, 31 ... water passage hole, 32 ... drain hole, 33 ... drain pipe, 34 ... water level detector.

Claims (1)

In the vertical valve turbine installed in the flow channel,
Spindle, the generator, the runners attached to the tip of the main shaft, the rotor and hydraulic turbine bearing provided between said runner, main shaft that is provided under the water wheel bearing having a rotor mounted on said main shaft A sealing device and a guide vane for adjusting the flow rate to the runner,
Using a ceramics seal as the spindle sealing device, and using a ceramics turbine bearing using ceramics as a sliding part as the turbine bearing,
A water turbine bearing lower chamber located under the water turbine bearing and into which water that has passed through the ceramic seal portion flows, and the water turbine bearing having the ceramic in the sliding portion with water from the water turbine bearing lower chamber are water-lubricated, A water turbine bearing upper chamber into which water flowing out of the sliding portion of the water wheel bearing flows,
The guide vane is supported by guide vane bearing portions provided on the inner guide vane ring and the outer guide vane ring, and the mounting position of the guide vane on the inner guide vane ring is positioned above the turbine bearing. A vertical valve turbine having a structure as described above, wherein a drainage hole is provided in an axial center portion of the guide vane so that water in the turbine bearing upper chamber flows out to the outside through the drainage hole.

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