JPS6151199B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water supply and drainage device for water lubricated bearings that supplies and discharges water as a lubricant to and from water lubricated bearings, and particularly for bearings in water turbines of hydraulic machines such as hydroelectric generators and pumps. The present invention relates to a water supply and drainage device for water-lubricated bearings suitable for use.

Currently, in view of the demand for oil-free bearings, water-lubricated bearings are sometimes used as the main shaft bearings of Kaplan water turbines. Figure 1 shows an example of this, in which the main shaft 2 connected to the liner 1 is connected to the water turbine cover 3.
It is supported by a water-lubricated bearing 4 installed inside. 5 is a guide vane. Such a water-lubricated bearing 4 requires a water supply and drainage device for constantly supplying and discharging water as a lubricant. An example of this water supply and drainage device is shown in FIG. 2. This device forms a water supply and drainage chamber 9 on the outer periphery of a water-lubricated bearing 4 using a water wheel cover 3, and communicates the chamber 9 with the bearing 4 through a water supply port 11 and a drain port 12.
Further, the discharge side of the pump 8, which is connected to a water tank 6 as a water supply source installed above via a water supply channel 7, is communicated to a water supply and drainage chamber 9 via a water supply channel 13, and further,
The chamber 9 is connected to the distribution channel 7 via a drainage channel 10, and the water in the water tank 6 is pressurized by a pump 8.
The pressurized water is sent to the water supply and drainage chamber 9, the water supply port 11, the water lubricated bearing 4, the drain port 12, and the drain channel 1.
Water as a lubricant is supplied and drained to the water-lubricated bearing 4 by forming a circulation path of 0, a distribution channel 7, and a pump 8. Incidentally, in Fig. 2, A indicates the inside of the water turbine pit, B indicates the outdoor section, and C indicates the pump room.

However, in this conventional water supply and drainage system, firstly,
Because the water supply channel from the pump to the water supply and drainage room 9 is long,
The water head loss in the road increases, and the pump capacity increases.
Second, since the water supply and drainage chambers share the body plate of the water turbine cover, pump pressure is applied to the body plate, and in order to support it, the body plate must be made thicker and reinforcement structures such as ribs must be used. must be established.
Thirdly, because the outdoor aquarium and the pump are connected in series, there is a risk that if the pump stops unexpectedly, a water hammer phenomenon may occur, causing damage to the pump and distribution channel. There is.

An object of the present invention is to provide a highly reliable and economical water-lubricated bearing water supply and drainage system.

The present invention forms a water supply and drainage chamber with two chambers, pressurizes water from a water source led to one chamber with a pump and sends it to the other chamber, supplies water to a water-lubricated bearing from this chamber, and returns the water from the bearing to the original water. By draining water into the chamber, water is supplied and drained to the water-lubricated bearing.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 3 showing an embodiment of the present invention, a water supply and drainage chamber 9 formed outside the water-lubricated bearing 4 is formed of an outer chamber 21 and an inner chamber 22, and the outer chamber 21 is It is connected to a water tank 6 as a water supply source via a water supply channel 23. A pump 8 is installed above the water supply and drainage chamber 9, and the water suction side 8A of the pump 8
The discharge side 8B communicates with the outer chamber 21, and the discharge side 8B communicates with the inner chamber 22. The inner chamber 22 communicates with the water-lubricated bearing 4 through water supply ports 24, 24, and the outer chamber 21 communicates with the water-lubricated bearing 4 through a drain port 25, respectively.

The operation of the water supply and drainage system for a water-lubricated bearing according to the above configuration will be explained. In FIG. 3, water supplied to the outer chamber 21 due to the position head of the water tank 6 is pumped 8
The water is absorbed and pressurized by the water, and is supplied from the discharge side 8B to the inner chamber 22, and then passes through the water supply port 24 to the water-lubricated bearing 4.
There, the water serves as a lubricant, and returns from the water-lubricated bearing 4 via the drain port 25 to the outer chamber 21, which has become in a low pressure state due to water absorption by the pump 8. From then on, the water acting as a lubricant is Through repeated circulation, water is supplied to and drained from the water-lubricated bearing, and it fulfills its designated role.

According to an embodiment of the present invention, not only can water as a lubricant be smoothly supplied and discharged to a water-lubricated bearing, but also the water distribution pipe 7 from the water tank to the pump and the water supply pipe from the water supply and drainage chamber in the conventional example can be improved. Since the drainage channel 10 to the outer chamber can be omitted, and the water supply channel 23 from the water tank to the outer chamber can be shortened as much as possible, piping equipment costs can be saved, and head loss in the channel can be reduced, allowing the pump to It is possible to effectively demonstrate the functions of the device, prevent the capacity from increasing, and improve economic efficiency.
Furthermore, since the water suction side from the outer chamber to the pump is extremely shortened, it is possible to prevent a water hammer phenomenon caused by an unexpected stoppage of the pump, thereby improving reliability.
Further, since the pump installed on the water supply and drainage chamber in the water turbine cover is close to the water-lubricated bearing section, maintenance and management of the bearing can be performed comprehensively. The outer chamber of the water supply and drainage chamber is on the water suction side of the pump and is in a low pressure state, so even if the body plate of the water turbine cover is shared, there is no need to consider the reinforcement structure of the body plate. Further, since the outer chamber of the water supply and drainage chamber is in contact with the water surface of the water turbine with the body plate of the water turbine cover interposed therebetween, excellent heat dissipation efficiency of the lubricating water can be obtained.

The present invention is applicable not only to water-lubricated bearings for the main shaft of Kaplan water turbines, but also to bearings in other types of hydraulic machines and other various water-lubricated bearings.
Can be applied. Furthermore, the two chambers forming the water supply and drainage chamber are not limited to being formed as an outer chamber and an inner chamber, and can be modified in various ways such as vertically, horizontally, etc. Furthermore, the present invention allows for various modifications. It is.

As described above, according to the present invention, it is possible to obtain a highly reliable and economical water supply and drainage device for a water-lubricated bearing.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of the main parts showing the installation state of water-lubricated bearings in a Kaplan turbine, Fig. 2 is an explanatory drawing conceptually showing a conventional example, and Fig. 3 is an illustration of an embodiment of the present invention. FIG. 3... Water turbine cover, 4... Water lubricated bearing, 6...
Water tank, 8...pump, 9...water supply and drainage room, 21...
Outer chamber, 22... Inner chamber, 23... Water supply channel, 24
...Water supply port, 25...Drain port.

Claims (1)

[Claims] 1 A water supply and drainage chamber is formed outside the water lubricated bearing and communicates with the bearing through a water supply and drainage port, and a pump for supplying and draining water is provided in the water supply and drainage chamber, and water from the water supply source is supplied and discharged to the water lubricated bearing. In the water supply and drainage device for a water-lubricated bearing, the water supply and drainage chamber is formed of two chambers, one chamber is communicated with the water supply source, and the water suction side of the pump is connected to the chamber communicating with the water supply source, and the discharge side thereof is connected to the chamber communicating with the water supply source. communicate with the other chamber, and the chamber communicating with the discharge side communicates with the water-lubricated bearing through the water supply port, and the chamber communicating with the water suction side communicates with the water-lubricated bearing through the drain port. A water supply and drainage system for water-lubricated bearings.