JP2008095565A - Submerged bearing lubricating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged bearing lubricating system low in cost, high in reliability and capable of producing clean water from river water and performing lubrication and cooling with a small quantity of clean water. <P>SOLUTION: The submerged bearing lubricating system using water as a lubricant in a hydraulic machine such as a water turbine or a pump water turbine is constituted to branch and lead out a water supply pipe having an on-off valve from a hydraulic iron pipe for supplying a runner chamber of the hydraulic machine with river water to mount a foreign matter classifier to the outlet side of the water supply pipe, to provide a sorting tank for storing foreign matter-reduced water falling from an inner cylinder outlet of the foreign matter classifier and to supply a submerged bearing with clean water overflowing from an outlet of the sorting tank as clean water. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lubrication system for an underwater bearing that uses water as a lubricant in a hydraulic machine such as a water turbine or a pump turbine.

  Oil-lubricated bearings are mainly used as main bearings for water turbines. However, underwater bearings have recently attracted attention due to concerns about river pollution due to oil spills. Some underwater bearings use ceramics and resin materials, but ceramics are not used so much because they are easily broken and expensive. On the other hand, among super engineering plastics, attempts have been made to apply polyether ether ketone resins and polyphenylene sulfide resins, which are less expensive than ceramics and have excellent water lubrication characteristics, to the sliding surfaces of underwater bearings. As described above, clean water (corresponding to tap water or well water) that does not contain foreign substances is required from the viewpoint of wear resistance for a lubricant for an underwater bearing using a resin material for the bearing sliding surface. However, in hydropower plants, it is difficult to secure tap water and well water, and the adoption of underwater bearings has not progressed. Therefore, if a lubrication system that can produce a small amount (several liters / minute) of clean water (equivalent to tap water or well water) that does not contain foreign substances from river water and supply it to underwater bearings can be established, the practical application of underwater bearings will accelerate. May progress.

  JP-A-9-310672 (Patent Document 1) discloses a bearing water supply device for a water turbine. In this bearing water supply device, a main water strainer is connected to a pipe branched from a water supply iron pipe, and a main shaft-filled seat water supply strainer is connected to a discharge port through which filtrated water of the main water supply strainer flows through the main water supply pipe. The outlet from which the filtered water of the main shaft seating water supply strainer is discharged is connected to the main shaft seat via the main shaft seat water supply pipe, and the sand discharge port is connected to the bearing via the bearing cooling pipe. In addition, the sand discharge port of the main water supply strainer is connected to the sand discharge tank through the sand discharge pipe.

  Since it is not necessary to branch the main water supply pipe coming out of the main water supply strainer to the main shaft-filled water supply strainer and the bearing as in the prior art, the cooling water piping is simplified.

  As an underwater bearing device, as disclosed in Japanese Patent Application Laid-Open No. 11-210611 (Patent Document 2), lubrication and cooling of the bearing device can be performed without using facilities such as a water supply pump and a rapid filtration device. In this method, water is taken from water and the bearing is lubricated and cooled. In this method, in a submerged bearing device using water as a lubricant, a water supply pipe having an on-off valve is branched and introduced from an upstream side of an inlet valve of a hydraulic iron pipe for supplying water to the runner chamber of the hydraulic machine. And it is the method of supplying the water in a hydraulic iron pipe to a bearing part via the water supply pipe.

  If the underwater bearing material is made of a material that is harder than foreign matter (foreign matter contained in river water) such as ceramics or ceramic coating, it has excellent wear resistance against foreign matter, so the above water supply method can be used sufficiently. It is.

  Further, a water-lubricated guide bearing device using PEEK resin is disclosed in Japanese Patent Laid-Open No. 2003-28146 (Patent Document 3). This bearing is a guide bearing device of a rotating electrical machine provided with a guide sector that supports a radial load of a rotating body. As a sliding surface material of the guide sector, a polyether ether ketone resin of a polymer material is used as a fiber material, for example, carbon fiber. Is filled with water or alcohol as a lubricating fluid having a viscosity lower than that of turbine oil between the rotating body and the guide sector, and the guide sector is pressed against the rotating body, enabling stable operation. In addition, a guide bearing device capable of reducing loss can be obtained.

  Also, the bearing gap of the vertical shaft pump submersible bearing is lubricated by a part of the pumped liquid, and foreign matter contained in the pumped liquid enters the bearing gap of the submerged bearing not only during the operation of the vertical pump but also when it is stopped. Japanese Unexamined Patent Publication No. 8-326691 (Patent Document 4) discloses a structure for preventing intrusion. An annular upper bracket that surrounds the main shaft is attached to the upper end of the boss of the underwater bearing, the upper surface of the upper bracket is inclined so as to descend from the inner periphery toward the outer periphery, and the outer peripheral surface communicates with the inner peripheral surface. Provide a lubricating water intake hole. Also, an annular lower bracket surrounding the main shaft is attached to the lower end of the boss of the underwater bearing, the lower surface of the lower bracket is inclined so as to rise from the inner periphery toward the outer periphery, and a spiral groove is formed on the inner peripheral surface. Provide. In this way, entry of foreign matter into the sliding surface of the underwater bearing is prevented.

  Japanese Patent Laid-Open No. 2002-1560928 (Patent Document 5) discloses an underwater bearing lubrication system that wets an underwater bearing with a lubricating liquid and adjusts the pressure of the lubricating liquid to be slightly higher than the pressure outside the bearing case. In this system, underwater bearings are provided inside the bearing case, and shaft sealing members are provided on both ends in the axial direction of the bearing case to form a lubricating liquid chamber. The underwater bearing is wetted by the lubricating liquid in the lubricating liquid chamber, and the lubricating liquid chamber The lubricating liquid discharged from the lubricating liquid pump is caused to flow into and out of the inflow pipe, and a lubricating liquid pressure sensor and a flow rate adjusting valve are provided in the outflow pipe, and a pressure sensor is provided in the discharge side elbow of the main pump.

  During pumping operation, the pressure outside the bearing case is calculated from the detected value of the pressure sensor and the height difference between the position and the underwater bearing, and the flow rate adjustment valve is set so that the pressure in the lubricating fluid chamber is slightly higher than the calculated pressure. In the aerial operation in which the discharge pressure is not detected by the pressure sensor, the flow rate adjustment valve is adjusted so that the pressure in the lubricating liquid chamber is slightly higher than the atmospheric pressure. By doing in this way, damage to the underwater bearing sliding contact part of a preceding standby operation pump can be prevented.

Japanese Patent Laid-Open No. 9-310672 Japanese Patent Publication No. 11-210611 JP 2003-28146 A JP-A-8-326691 JP 2002-156092 A

  The bearing water supply apparatus in Patent Document 1 relates to simplification of a cooling water piping system for cooling the bearing, and does not relate to a lubricant supply system for lubricating the bearing. If the bearing lubricant can be manufactured and supplied from river water in an underwater bearing, the lubrication and cooling of the bearing can be performed at the same time, which may further simplify the piping system. However, it is not considered that the lubricant used for the bearing is manufactured from river water and the bearing is lubricated and cooled at the same time.

  Further, in the underwater bearing device disclosed in Patent Document 2, ceramics or ceramic coating having a hardness higher than that of foreign matters contained in river water is used as the bearing material, so that it can be sufficiently used. However, if an attempt is made to use a resin material having self-lubricating properties and excellent water-lubricating characteristics, the bearing material may be damaged by foreign matter and may not be used as an underwater bearing device. Therefore, in this underwater bearing device, sufficient consideration is not given to using a resin material having a hardness lower than that of a foreign material as a bearing material.

  For this reason, when a low-cost resin material is applied to the bearing material, it is required to purify and supply water taken from river water equivalent to tap water or well water.

  Further, in Patent Document 3, in a guide bearing device of a rotating electrical machine having a guide sector, as a sliding surface material of the guide sector, a material obtained by filling, for example, carbon fiber as a fiber material into a polyether ether ketone resin as a polymer material. It is disclosed that water or alcohol is used as a lubricating fluid having a viscosity lower than that of turbine oil between the rotating body and the guide sector. Since water is used, a low-loss bearing can be achieved, but when considering long-term use, there is a possibility that stable sliding characteristics may not be obtained without maintenance because the bearing lubricant is insufficient due to evaporation loss of water. There is. For this reason, it is necessary to automatically supply the water shortage due to evaporation loss, but the replenishment method is not considered.

  Further, in Patent Document 4, the bearing gap of the submerged bearing of the vertical pump is lubricated by a part of the pumped liquid, and foreign matter contained in the pumped liquid is not only during the operation of the vertical pump but also stopped. The structure which prevented intrusion in the bearing gap of this is disclosed. Since this underwater bearing uses pumped liquid as a lubricant, a foreign matter intrusion prevention device is provided in the bearing from the viewpoint of improving wear resistance.

  By installing this foreign matter intrusion prevention device, a part of the relatively clean pumped liquid near the inner periphery of the pumped path is taken into the bearing gap through the lubricating water intake hole of the upper bracket, and the bearing gap is lubricated. After that, it is urged by the spiral groove of the lower metal fitting and forcibly discharged. Since only a small amount of foreign matter remains in the lubricating water, the wear resistance of the bearing is improved. However, even a small amount of foreign matter may be embedded in the bearing sliding surface without passing through the bearing sliding surface. Foreign matter embedded in the bearing sliding surface may cause wear damage to the rotating shaft. Therefore, sufficient consideration has not been given to maintaining stable bearing performance for a long period of time and preventing damage to the rotating shaft.

  Further, Patent Document 5 discloses an underwater bearing lubrication system in which an underwater bearing is wetted with a lubricating liquid as a lubricating method of the underwater bearing, and the pressure of the lubricating liquid is adjusted slightly higher than the pressure outside the bearing case. The system is a forced lubrication system in which lubricating liquid is supplied to the bearing by a lubricating liquid pump. Therefore, in the unlikely event that the lubricating liquid pump fails, there is a possibility that the main engine drain pump cannot be operated, and sufficient consideration has not been given to the high reliability of the system.

  As described above, the known example discloses a cooling water piping system for a bearing, a submerged bearing device using ceramics or polyether ether ketone resin, a foreign matter intrusion preventing device for a submerged pump bearing, a submerged bearing lubrication system, and the like. However, when considered as a lubrication system for underwater bearings of water turbines installed in hydroelectric power plants, it is difficult to secure tap water and well water at hydroelectric power plants, so the river water used for power generation is purified. However, it is essential to produce clean water having cleanliness equivalent to tap water or well water, and to use this clean water as a lubricant for underwater bearings, but such a lubrication system is not considered.

  An object of the present invention is to produce a small amount of clean water having cleanliness equivalent to tap water or well water from river water continuously, and at a low cost so that the produced clean water can be automatically supplied as a lubricant for underwater bearings. The object is to provide a highly reliable underwater bearing lubrication system.

  The purpose of the present invention is to provide a submerged bearing lubrication system using water as a lubricant in a hydraulic machine such as a water turbine or a pump turbine, and a water supply pipe having an open / close valve from a hydraulic iron pipe for supplying river water to the runner chamber of the hydraulic machine. Branch out, attach a foreign substance classifier on the outlet side of the water supply pipe, place a sorting tank on the inner cylinder outlet side of the foreign substance classifier, and use the clean water overflowed from the outlet side of the sorting tank as a lubricant for the submersible bearing It is characterized by being configured to supply.

  In order to achieve the above object, the present invention provides a hydraulic system for supplying river water to a runner chamber of a hydraulic machine in a submersible bearing lubrication system using water as a lubricant in a hydraulic machine such as a water turbine or a pump turbine. A main water strainer is attached to the pipe branched from the iron pipe, a water supply pipe having an open / close valve connected to the discharge side of the main water strainer is attached, and a foreign substance classifier is installed in the water pipe. A sorting tank is arranged on the tube outlet side, and clean water overflowed from the outlet side of the sorting tank is supplied as a lubricant to the submersible bearing.

  In order to achieve the above object, the present invention provides a hydraulic system for supplying river water to a runner chamber of a hydraulic machine in a submersible bearing lubrication system using water as a lubricant in a hydraulic machine such as a water turbine or a pump turbine. A decompressor is connected to a pipe having a main water strainer connected to the pipe branched from the iron pipe and an open / close valve connected to the discharge side of the main water strainer, and a foreign substance classifier is fixed to the outlet side of the decompressor. A sorting tank is installed on the inner cylinder outlet side of the classifier, and clean water overflowed from the outlet side of the sorting tank is supplied as a lubricant to the submersible bearing.

In the above invention, more preferably, the following configuration is adopted.
(1) The foreign substance classifier has a foreign substance discharge port and an inner cylinder outlet configured in the same direction, and a small-diameter pipe installed at the inner cylinder inlet portion.
(2) The sorting tank is composed of an exclusion means for stirring and discharging the sediment deposited on the bottom, and at least one current plate.

  According to the present invention, a small amount of clean water having a cleanliness equivalent to tap water or well water is continuously produced from river water, and the produced clean water can be automatically supplied as a lubricant for underwater bearings at a low cost. A highly reliable underwater bearing lubrication system can be provided.

  Embodiments of the present invention will be described below with reference to the drawings. In the second and subsequent embodiments, the duplicate description of the configuration common to the first embodiment is omitted. In addition, the same code | symbol in the figure of each Example shows the same thing or an equivalent.

FIG. 1 is a diagram showing an embodiment of the present invention.
In FIG. 1, a generator 4 is directly connected to an upper portion of a main shaft 2 of a water turbine 1 via a coupling 3, and a hydraulic iron pipe 6 is connected to a casing 5. The river water flowing into the casing 5 from the hydraulic iron pipe 6 gives a rotational force to an impeller (not shown) fixed to the lower end portion of the main shaft 2, and then flows out from the draft tube 7. The hydraulic iron pipe 6 is provided with an inlet valve 8 near the casing 5, and a water supply pipe 9 is branched out from the hydraulic iron pipe 6 on the upstream side of the inlet valve 8. Here, the branch position of the water supply pipe 9 is on the upstream side of the inlet valve. However, even if it is provided on the downstream side of the inlet valve, the same effect can be obtained, so the branch position is not particularly limited. An on / off valve 10 is fixed to the water supply pipe 9, a foreign substance classifier 11 is attached to the water supply pipe 9 a on the outlet side of the on / off valve 10, and foreign substance restriction water (small diameter) falling from the inner cylinder outlet side 11 a of the foreign substance classifier 11 A sorting tank 12 that stores only foreign matters is provided, a receiving tray 13 that stores clean water overflowed from the outlet side of the sorting tank 12 is provided, and a water supply pipe 9b that communicates with the underwater bearing is connected to the receiving tray 13. . The sorting tank 12 is provided with a partition plate 14 to prevent the foreign substance restricted water falling from the inner cylinder outlet side 11a of the foreign substance classifier 11 from flowing directly to the tray 13 side. I let it flow into the side. Therefore, the foreign substance restricted water that has fallen passes through the lower part of the partition plate 14, and then flows through the plurality of rectifying plates 15 to reach the outlet 12a. It changes to clean water that does not contain.

  On the other hand, the small-diameter foreign matter contained in the foreign matter-restricted water precipitates in the course of flowing and accumulates on the bottom 16, and the removing means 17 for periodically discharging the deposited precipitate out of the sorting tank. Is provided. Here, the exclusion means 17 includes a screw 17a that stirs and discharges sediment at the bottom, an electric motor 17b that drives the screw 17a, a discharge port 17d, and an electromagnetic valve 17c. The sediment is discharged periodically, and the operation at that time is shown below.

  When the amount of sediment increases, the electric motor 17b is operated and the screw 17a is rotated. The precipitate is sent to the outlet by a rotating screw. By opening the electromagnetic valve 17c, the precipitate is discharged to the outside together with the foreign substance restricted water. As a means of removing sediment, the method of simply tilting the bottom of the sorting tank and using the flow of foreign material restricted water when discharging is considered. It was found that it was difficult to move to the discharge port at a moving flow velocity, and it was necessary to stir and move the precipitate. On the other hand, it was experimentally confirmed that the method of stirring the precipitate and forcibly moving it to the outlet as in the present invention was effective.

  It is desirable to install the solenoid valve on the foreign matter classifier side. This is because the foreign substance classifier side is the side where the particle size of the foreign substance that settles is large, and the precipitate can be easily moved to the discharge port side. By opening the solenoid valve 17c, the water level in the sorting tank is lowered and clean water does not flow toward the tray. However, since the amount of lubricating water in the submerged bearing is reduced by the amount of evaporation, the operation can be continued without problems. When there is no foreign matter restriction water in the sorting tank, the electromagnetic valve 17c is closed and storage of foreign matter restriction water is started. While the water level gradually rises, the small-diameter foreign matter contained in the foreign matter-restricted water settles during this time, so when the water storage is completed, the clean water overflows from the sorting tank outlet 12a to the tray. Thus, since the sediment deposited in the regular sorting tank can be discharged, the water storage capacity of the sorting tank can be maintained at a constant value, and clean water can be stably supplied to the underwater bearing for a long period of time.

FIG. 2 is a cross-sectional view of the sorting tank shown in FIG.
In FIG. 2, a plurality of communication ports 19 are formed between the current plate 15 and the upper lid 18. By forming the communication port 19, the air layer can also be moved to the tray side, so that the amount of stored water can be prevented from changing. In addition, the sorting tank has an inclined portion 19a so that the foreign matter that settles gathers at the bottom. The settled foreign matter slides down the inclined portion and accumulates on the upper surface of the screw. As described above, the precipitate is periodically discharged outside by the exclusion means.

FIG. 3 is a sectional view of the underwater bearing.
In FIG. 3, the underwater bearing 30 includes a sleeve 32 fixed to the outer periphery of the main shaft 2, a bearing member 33 that is in sliding contact with the sleeve 32, and a water tank 20 that stores lubricating water. The water supply pipe 9b penetrates the water tank 20 and is open to the inside of the water tank so that clean water is supplied to the underwater bearing. Excess clean water leaks from the drain pipe 21 and is maintained at a constant water level. Thus, by opening the on-off valve 10, the river water in the hydraulic iron pipe 6 is automatically blown into the foreign material classifier 11, and purified water purified through the sorting tank is obtained.

As shown in FIG. 4, the river water blown into the foreign substance classifier 11 turns into a swirl flow along the inner peripheral surface of the outer cylinder 22, and centrifugal force acts on the foreign substances contained in the river water, causing large foreign substances (particles). Diameter: 0.2
mm or more) moves to the outer periphery. The transferred large foreign matter descends in the direction of gravity while turning along the inner peripheral surface of the outer cylinder, and is discharged along with river water from the foreign matter discharge port 23. For this reason, there is foreign matter restriction water containing only small foreign matters (particle size: less than 0.2 mm) near the center of the foreign matter classifier. The foreign substance restricted water containing only small foreign substances flows out from the inner cylinder outlet 11a. The inner cylinder 11b has a small-diameter pipe 11c arranged at the inlet portion. Generally, there is an appropriate range between the outer diameter Dc of the inner cylinder 11b and the inner diameter De of the outer cylinder 22, and the following dimensional relationship is established.

Dc = (1/4 to 1/6) De
For example, when the inner diameter De of the outer cylinder 22 is designed to be about 100 mm, Dc is about 20 mm. Therefore, if there is no small diameter pipe at the inlet, the discharge flow rate from the outlet of the inner cylinder will greatly exceed the required flow rate (several liters / min), and river water will be wasted and the water-saving type will be lost. It is essential. Therefore, a small-diameter pipe 11c is installed at the inner cylinder inlet portion so that clean water to be supplied can be saved while maintaining an appropriate dimensional relationship. The required flow rate can be ensured by making the size of the small diameter pipe 11c appropriate. Since the foreign substance restricting water flowing from the small diameter pipe 11c is more central than the case of the inner cylinder 11b alone, the particle diameter of the foreign substance contained in the foreign substance restricting water can be further reduced and the concentration of foreign substances can be reduced. It is possible to lengthen the interval for operating the foreign matter removing means of the tank. As a result, the cost for operating the foreign matter removing means can be saved.

  In the foreign matter classifier 11 of the present invention, the foreign matter discharge port 23 and the inner cylinder outlet 11 a are arranged in the same direction, and the foreign matter discharge port 23 is surrounded by the inner tube 11 b and the outer tube 22.

  On the other hand, a known cyclone shape generally used is shown in FIG. 10, and the foreign matter discharge port 31d and the inner cylinder outlet 31e are configured in opposite directions. With this configuration, when the blowing speed is increased, the water above the foreign matter discharge port 31d is swirled under the influence of the swirling flow, and a lower pressure portion is generated than the outside air. As a result, the low pressure portion forms an air column, the air grows inside the cyclone, and the foreign substance discharge port 31d progresses to a state where it is blocked by the air column. Therefore, when the blowing speed is increased, a sufficient foreign matter discharging function cannot be maintained.

  On the other hand, in the foreign matter classifier 11 of the present invention, the foreign matter discharge port 23 is surrounded by the inner cylinder 11b and the outer cylinder 22, so that it is not affected by the air column at all, and thus is stable regardless of the blowing speed. Maintains foreign matter discharge function. Furthermore, in the foreign matter classifier of the present invention, the foreign matter restricted water (water containing only small-diameter foreign matter) falls in the direction of gravity, so that it becomes smoother than the case of upward as in the conventional example, and a certain amount of foreign matter Restricted water can be supplied stably for a long time. The foreign substance restricted water dropped from the foreign substance classifier 11 is supplied into the sorting tank 12. The water level in the sorting tank 12 gradually rises and overflows to the tray 13 installed on the outlet side. When the overflowing flow rate is several liters / minute, the flow rate of the foreign substance restricted water in the sorting tank 12 is about 0.002 m / s.

FIG. 5 is a diagram showing the relationship between the settling distance of each particle size and the traveling direction distance when the foreign material restricted water moves at 0.002 m / s from the sorting tank inlet toward the tray.
In FIG. 5, when the particle size of the foreign substance is 100 μm shown by the solid line, it settles for about 6 m at a travel direction distance of 0.04 m 2. On the other hand, in the case of a particle size of 1 μm indicated by a two-dot chain line, it settles by about 0.6 m at a traveling direction distance of 0.2 m. From this result, if the distance from the entrance of the sorting tank to the tray side can be secured by about 0.5 m, clean water can be supplied to the tray 13. The clean water is supplied to the underwater bearing by a water supply pipe 9b connected to the receiving tray 13.

  As described above, the sediment accumulated on the bottom of the sorting tank 12 can be discharged by periodically rotating the screw and opening the electromagnetic valve 17c, so that the function of producing clean water from the foreign matter restricted water Can be maintained for a long time. The clean water supplied to the underwater bearing lubricates and cools the bearing sliding surface, so that stable bearing performance can be obtained.

  Therefore, the underwater bearing can prevent wear damage and maintain stable bearing performance for a long period of time. Furthermore, since clean water can be produced from river water, it is not necessary to secure tap water or well water, and a low-cost submersible bearing lubrication system can be provided. Here, a screw is used as an element constituting the exclusion means for stirring and discharging the sediment accumulated in the sorting tank, but any member having a function of transporting the sediment to the discharge port while rotating can be used. There is no particular limitation.

  In the submersible bearing lubrication system that combines a foreign substance classifier and a sorting tank, both the foreign substance classifier and the sorting tank have a structure that can reliably prevent the accumulation of foreign substances. Therefore, there is a highly reliable and low-cost lubrication system. Can be established.

FIG. 6 is a view showing a second embodiment of the lubrication system for an underwater bearing according to the present invention.
In FIG. 6, this embodiment is different from the first embodiment in that the current plate 15 installed in the sorting tank 12 is made into one sheet. According to this embodiment, basically the same effect as the first embodiment described above can be obtained, and since the number of rectifying plates can be reduced, material cost and production cost can be saved, and the lubrication system can be reduced. Cost reduction can be achieved. Furthermore, since the storage capacity of the foreign substance restricted water is increased due to the reduction of the flow regulating plate, the sorting tank can be miniaturized from the viewpoint of a constant storage capacity, and the cost can be reduced and the installation area can be reduced.

FIG. 7 is a view showing a third embodiment of the underwater bearing lubrication system according to the present invention.
In FIG. 7, this embodiment differs from the first embodiment in that a main water strainer 40 is mounted between the hydraulic iron pipe 6 and the on-off valve 10. According to this embodiment, basically the same effects as the first embodiment described above can be obtained, and the main water strainer 40 is formed by rolling a steel plate having a number of holes of about 3 mm in diameter into a cylindrical shape. Thus, the river water is placed inside the cylinder, and the filtered river water flows out to the outside. Therefore, the particle size of the foreign material flowing into the foreign material classifier can be suppressed to 3 mm or less, so that the foreign material removal function of the foreign material classifier is improved, and the foreign material concentration of the foreign material restricted water falling into the sorting tank can be reduced. The number of operations of the foreign matter removing means provided in the sorting tank can be reduced. As a result, the reliability of the lubrication system is further improved.

FIG. 8 is a diagram showing a fourth embodiment of the submersible bearing lubrication system according to the present invention.
In FIG. 8, this embodiment differs from the first embodiment in that a main water strainer 40 is installed between the hydraulic iron pipe 6 and the on-off valve 10, and a pressure reducing device 50 is provided on the protruding side of the on-off valve 10. There is in point. According to this embodiment, basically the same effects as those of the first embodiment described above can be obtained, and the main water supply strainer 40 and the pressure reducing device 50 are added. The water quality and speed can be adjusted at the same time, and the amount of river water supplied to the underwater bearing can be optimized. For this reason, the lubrication system of the underwater bearing which can control the water intake from a hydraulic iron pipe to an appropriate quantity can be constructed.

FIG. 9 is a view showing a fifth embodiment of the submersible bearing lubrication system according to the present invention.
In FIG. 9, this embodiment differs from the first embodiment in that the bottom of the sorting tank is an inclined surface 19b. According to this embodiment, basically the same effects as those of the first embodiment described above can be obtained, and the bottom is inclined, so that the precipitate is discharged when the precipitate removing means operates. It becomes easy to move to the exit side, and the operation time can be shortened. As a result, the life of the screw can be extended and the long-term reliability of the lubrication system can be maintained.

  As described above, according to the present invention, in a hydraulic system such as a water turbine or a pump turbine, an underwater bearing lubrication system that uses water as a lubricant opens and closes from a hydraulic iron pipe that supplies river water to the runner chamber of the hydraulic machine. A water supply pipe with a valve is branched and led out, a foreign matter classifier is installed on the outlet side of the water supply pipe, a sorting tank is provided to store the foreign substance restriction water flowing out from the inner cylinder outlet of the foreign substance classifier, and overflows from the outlet side of the sorting tank Since the purified water is supplied to the underwater bearing as a lubricant, the underwater bearing is supplied with clean water having a cleanliness equivalent to tap water or well water purified from river water and stable for a long period of time. It is possible to provide an underwater bearing capable of obtaining the above-mentioned bearing performance.

  That is, the river water derived from the hydraulic iron pipe is blown into the foreign matter classifier. A swirl flow is given to the river water blown into the foreign matter classifier, and large foreign matter (particle size: 0.2 mm or more) moves in the direction of gravity while turning around the outermost periphery by centrifugal force, and is exposed to the outside from the foreign matter discharge port. Released. Foreign substance restricted water (river water after removing large foreign substances) falls into the sorting tank from the inner cylinder outlet provided at the center of the foreign substance classifier. Foreign matter (particle size: less than 0.2 mm) contained in the restricted water that has fallen into the sorting tank penetrates toward the bottom and settles toward the bottom along with the flow. Clean water with cleanliness equivalent to well water flows out. Since this clean water is supplied to the underwater bearing, stable bearing performance can be obtained. Further, since a certain amount of clean water is always supplied even for long-term use, it is possible to prevent poor lubrication due to a decrease in the lubricant and to obtain stable bearing performance.

  According to the preferred configuration of the present invention described above, the foreign substance classifier comprises a foreign substance discharge port and an inner cylinder outlet which is the outlet side of the foreign substance restricted water in the same direction, and a small diameter pipe is attached to the inner cylinder inlet portion. Therefore, the sand discharging function from the foreign substance discharge port can be maintained regardless of the blowing speed of the foreign substance classifier, and a small amount of foreign substance restricted water can be supplied to the sorting tank. Therefore, this foreign matter classifier can stably supply a small amount of foreign matter restricted water to the sorting tank over a long period of time. As a result, a highly reliable lubrication system can be provided.

  Further, according to the above-described preferred configuration of the present invention, the sorting tank is provided with an exclusion means for stirring and discharging the sediment deposited at the bottom of the sorting tank, so that the sediment is deposited at the bottom of the sorting tank. It can be used without maintenance even for long-term use.

  In the submersible bearing lubrication system of the present invention, river water derived from the hydraulic iron pipe flows into the foreign matter classifier. A swirling flow is given to the river water that has flowed into the foreign matter classifier, and the foreign matter moves in the direction of gravity while turning around the outermost periphery by centrifugal force, and is discharged to the outside from the sand discharge port. From the inside of the small diameter tube provided at the center of the foreign matter classifier, the foreign matter reduced water after the large foreign matter is removed falls into the sorting tank. The foreign matter (particle size: less than 0.2 mm) contained in the foreign matter-reduced water in the sorting tank settles toward the bottom along with the flow, and changes to clean water that does not contain any foreign matter. Since this clean water is overflowed and supplied to the underwater bearing, stable bearing performance can be obtained. Moreover, since the sediment removal means is installed in the sorting tank, the amount of stored water can be kept constant by operating it periodically, so that clean water can be supplied stably. As a result, the lubricant can be prevented from decreasing and stable bearing performance can be obtained.

It is a block diagram which shows the 1st Example of the lubrication system of the underwater bearing of this invention. It is sectional drawing of the sorting tank which comprises the lubrication system of FIG. It is sectional drawing of the underwater bearing which comprises the lubrication system of FIG. It is sectional drawing of the foreign material classifier which comprises the lubrication system of FIG. It is the figure explaining the relationship between the foreign material sedimentation distance and the advancing direction distance in a sorting tank. It is a block diagram which shows the 2nd Example of the lubrication system of the underwater bearing of this invention. It is a block diagram which shows the 3rd Example of the lubrication system of the underwater bearing of this invention. It is a block diagram which shows the 4th Example of the lubrication system of the underwater bearing of this invention. It is a block diagram which shows the 5th Example of the lubrication system of the underwater bearing of this invention. It is sectional drawing which shows a well-known cyclone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turbine 2 Main shaft 3 Coupling 4 Generator 5 Casing 6 Hydraulic iron pipe 7 Draft tube 8 Inlet valve 9, 9a, 9b Water supply pipe 10 On-off valve 11 Foreign substance classifier 11b Inner cylinder 11c Small diameter pipe 12 Sorting tank 12a Sorting tank outlet 13 Receptacle 14 Partition plate 15 Current plate 16 Bottom portion 17 Exclusion means 17a Screw 17b Motor 17c Solenoid valve 17d Discharge port 18 Upper lid 19 Communication port 19a Inclined portion 20 Water tank 21 Drain pipe 22 Outer cylinder 23 Foreign matter discharge port 30 Underwater bearing 40 Main water supply strainer 50 Depressurization apparatus

Claims (5)

  In a submerged bearing lubrication system that uses water as a lubricant in a hydraulic machine such as a water turbine or a pump turbine, a water supply pipe having an open / close valve is branched out from a hydraulic iron pipe that supplies river water to the runner chamber of the hydraulic machine, Install a foreign substance classifier on the outlet side of the water supply pipe, place a sorting tank on the inner cylinder outlet side of the foreign substance classifier, and supply clean water overflowing from the outlet side of the sorting tank to the underwater bearing as a lubricant. A lubrication system for an underwater bearing characterized by comprising. In submerged bearing lubrication systems that use water as a lubricant in hydraulic machines such as water turbines and pump turbines,
A main water strainer is attached to a pipe branched from a hydraulic iron pipe that supplies river water to the runner room of the hydraulic machine, and a water pipe having an on-off valve connected to the discharge side of the main water strainer is attached. A foreign matter classifier is installed on the inner cylinder outlet side of the foreign matter classifier, and a clean water overflowing from the outlet side of the sorting tank is supplied to the underwater bearing as a lubricant. Underwater bearing lubrication system. In submerged bearing lubrication systems that use water as a lubricant in hydraulic machines such as water turbines and pump turbines,
A decompressor is connected to a main water strainer connected to a pipe branched from a hydraulic iron pipe for supplying river water to the runner chamber of the hydraulic machine, and a pipe having an on-off valve connected to the discharge side of the main water strainer, A foreign substance classifier is fixed to the outlet side of the decompression device, a sorting tank is installed on the inner cylinder outlet side of the foreign substance classifier, and clean water overflowed from the outlet side of the sorting tank is supplied to the underwater bearing as a lubricant. A lubrication system for an underwater bearing characterized by the above. The underwater bearing lubrication system according to any one of claims 1 to 3,
The foreign matter classifier has a foreign matter discharge port and an inner cylinder outlet configured in the same direction, and a small-diameter pipe is installed at the inner cylinder inlet portion. The underwater bearing lubrication system according to any one of claims 1 to 3,
The submerged bearing lubrication system is characterized in that the sorting tank is provided with an excluding means for stirring and discharging sediment deposited on the bottom of the sorting tank and at least one current plate.

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