JP2002221141A - Bearing device for vertical bulb turbine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device for a vertical bulb turbine of a simplified structure and superior in a maintenance property by solving the problem in which an oil containing or oil circulating type oil lubrication bearing is used to make it difficult in maintenance and inspection owing to a complicated structure and a small space in a conventional bearing device of the vertical bulb turbine installed in a water passage. SOLUTION: In the vertical bulb turbine installed in the water passage, ceramic is used in a main shaft water seal part and a water turbine bearing part and the ceramic bearing is lubricated with water flowing through the ceramic seal part. Water discharged from the sliding part of the bearing flows out outside through a drain hole provided in the shaft center part of a guide vane.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for a vertical valve turbine installed in a flowing water channel.

[0002]

2. Description of the Related Art A conventional water turbine bearing device of a vertical valve turbine installed in a flowing water channel is an oil lubrication system using a cylindrical metal or a segment metal. Therefore, 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 a rise in bearing temperature. Further, a drainage device having a piping system for separately guiding the water leakage from the main shaft sealing portion to the outside has been required.

[0003]

In recent years, there has been an increasing number of plans for a vertical valve turbine that is advantageous in securing a power plant construction site and reducing civil costs such as excavation costs.

[0004] However, the conventional turbine bearing device of the vertical valve turbine uses an oil lubrication system of an oil self-contained or oil circulation system, so that the structure is complicated and the space is narrow, so that maintenance and inspection are difficult. There was a problem.

[0005] The present invention provides a vertical valve having a simplified structure and excellent maintainability by using a water lubrication structure using ceramics for a main shaft sealing portion and a water wheel bearing portion, and further using a gravity drainage system. A bearing device for a water turbine is provided.

[0006]

SUMMARY OF THE INVENTION A bearing device for a vertical valve turbine according to the present invention is a vertical valve turbine installed in a flowing water channel, wherein ceramics is used for a main shaft sealing device of a ceramic seal and a sliding portion. The turbine includes a water turbine bearing and a plurality of guide vanes having a drain hole in the shaft center for draining water from the water turbine bearing.

Further, there is provided a drainage device for guiding water discharged from the guide vanes to the outside, and a water level detector for detecting a water level staying above the bearing.

[0008]

FIG. 1 is a longitudinal sectional view of a vertical valve turbine provided with a bearing device according to the present invention. The valve 1 is an outer shell housing a water wheel and a generator, and is mounted on a foundation cradle 4 embedded in a concrete foundation 3 by a support arm 2 formed in a cross shape. Reference numeral 5 denotes a generator stator, and a rotor 6 is fixed to a main shaft 7. A runner 8 is attached to the tip of the main shaft 7, and a guide vane 9 is disposed along the circumference on the upstream side thereof, and has a function of changing the opening degree through a guide ring 10 and adjusting the flow rate to the runner 8. ing.

The rotating part composed of 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 the thrust bearing 11,
In addition to the weight of the rotating parts of the turbine and the generator, a large thrust due to running water on the runner 8 and the like acts during the operation of the vertical valve turbine. Reference numeral 14 denotes a spindle water sealing device which is one of the components of the present invention, and reference numeral 15 denotes a conical water turbine lower cover forming a water flow surface. 16 is an outer guide vane ring provided with a guide vane bearing, 17 is an inner guide vane ring provided with another guide vane bearing,
Reference numeral 18 denotes a discharge ring that forms a flow path for the runner 8.

Reference numeral 19 denotes an inspection shaft, which is a passage through which an operator enters and exits to inspect equipment in the valve 1, and which can be removed when assembling and disassembling the vertical valve turbine. Reference numeral 20 denotes an anti-vibration stay attached between the valve 1 and the concrete substructure 3 to suppress vibration during operation of the vertical valve turbine.

FIG. 2 shows the main shaft water sealing device 14 and the water turbine bearing 1.
FIG. 3 is a structural view around 3. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals. The ceramic sealing part 21 of the spindle water sealing device 14 is pressed against a slide ring 23 attached to the flange 22 of the spindle 7 by a spring (not shown) and a flowing water pressure to seal the flowing water. The amount of water passing through the seal portion can be changed by adjusting the spring, but the water that has left the seal portion flows into the lower chamber 24 of the water turbine bearing 13.

The ceramic bearing 25 is positioned by an adjusting bolt 27 attached to a bearing base 26, and the main shaft 7 is fixed.
An appropriate bearing gap is maintained between the ring and the ring 28 fitted to the ring.

The water in the lower chamber 24 of the water turbine bearing 13 enters the above-mentioned bearing gap, performs the functions of water lubrication and cooling, and flows into the upper chamber 29. Reference numeral 30 denotes a conical bearing cover having a water passage hole 31 for suppressing waving of the water surface in the upper chamber 29 due to rotation of the main shaft 7. Reference numeral 32 denotes a drain hole provided in the shaft center portion of the guide vane 9, which guides stored water in the bearing upper chamber 29 to a drain pipe 33 and drains the water to the outside. Reference numeral 34 denotes a water level detector, which is provided to detect an abnormal rise in the water level in the bearing upper chamber 29 due to clogging of the drain hole 32 or the like and issue a command such as an alarm notification.

According to the present invention, regardless of whether the vertical valve turbine is in operation or not, the flowing water that has passed through the ceramic main shaft sealing portion 14 performs the water lubrication and cooling functions of the ceramic turbine bearing portion 13 in the rear bearing upper chamber 29. Since the water is drained to the outside by a drain hole 32 provided in the shaft center portion of the guide vane 9, there is no need for a special drainage device or cooling device, so that 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 drain the water to the outside with a separately installed drain pump.

[0015]

The bearing device of the vertical valve turbine according to the present invention has the following features.
Water lubrication and cooling of the ceramic water wheel bearing 13 are performed by flowing water that has passed through the ceramic water sealing device 14, so that there is no need to supply water from outside. Further, the water that has come out of the sliding surface of the water wheel bearing is drained to the outside from the bearing upper chamber 29 through the drain hole 32 provided in the axis of the guide vane 9, so that the drainage system is simplified and maintenance and inspection are 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 of a vertical valve turbine according to the present invention.

FIG. 2 is a structural view around a water turbine bearing of the vertical valve turbine according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Valve, 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, 11 ... thrust bearing, 12 ... generator bearing, 13 ...
Turbine bearing, 14 ... spindle water sealing device, 15 ... lower cover of turbine,
16 outer guide vane ring, 17 inner guide vane ring, 18 discharge ring, 19 inspection shaft, 20 anti-vibration stay, 21 ceramic seal parts, 22 flange, 23 sliding ring, 24 turbine bearing Lower chamber, 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.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16J 15/34 F16J 15/34 F (72) Inventor Takeshi Aizawa 3-2-2 Saimachi, Hitachi-shi, Ibaraki No. Within Hitachi Engineering Services Co., Ltd. (72) Noboru Yamamoto Inventor 3-2-2, Sachimachi, Hitachi City, Ibaraki Prefecture F-term within Hitachi Engineering Services Co., Ltd. 3H072 AA06 AA27 BB07 BB23 BB24 CC01 CC10 CC23 CC42 CC68 CC82 CC91 3J011 AA07 BA02 DA01 JA02 KA02 LA01 MA27 NA02 RA01 SD01 3J041 AA02 BA04 DA11

Claims (1)

[Claims] 1. A vertical valve turbine installed in a flowing water channel, wherein ceramics are used for sealing a main shaft and bearings of the turbine,
The ceramic bearing is lubricated with running water that has passed through the ceramic seal portion, and water that has exited the sliding portion of the bearing flows out to the outside through a drain hole provided in the shaft center portion of the guide vane. Bearing device for vertical valve turbine.