JP2007255614A - Water lubricating guide bearing device and water turbine mounted with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain high wear resistance to bearing pads using a resin material for a sliding surface used in a water lubricating guide bearing device, to constitute the water lubricating guide device by incorporating the bearing pads therein, and to provide a water turbine using such a water lubricating guide bearing device. <P>SOLUTION: In this water lubricating guide bearing device for supporting a rotary shaft of a rotary machine, the resin material is used for the sliding surface, the resin material is made to protrude by a few millimeters to the sliding surface side than a metal case, and a plurality of the bearing pads stored and fixed in the metal case are disposed around the rotary shaft. The size relation of an inner peripheral side chord length (B) and an outer peripheral side chord length (b) of the metal case of the bearing pads is set to B≥b, or both end faces in the circumferential direction of the metal case are made to be inclined. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water-lubricated guide bearing device and a water wheel equipped with the same.

  An oil-lubricated bearing device is mainly used as a bearing for supporting the rotating shaft of the water turbine. However, water lubricated guide bearing devices have recently attracted attention due to concerns about river pollution due to oil spills and the like. Some of these water-lubricated guide bearing devices use ceramics, but ceramics are rarely used because they are easily broken and expensive.

  On the other hand, among super engineering plastics, attempts are made to apply polyether ether ketone resin, polyphenylene sulfide resin, and fluorine resin, which are lower in cost than ceramics and superior in water lubrication characteristics, to the sliding contact surface of the guide bearing device. However, since the resin material does not have sufficient wear resistance against foreign matter, it cannot be used in lubricating water mixed with foreign matter. Accordingly, in general, lubricating water close to clean water, which is free from foreign matters from the lubricating water and maintains cleanliness, is always supplied to the bearing water tank.

  However, in the case of water-lubricated bearings, from the viewpoint of simplification of auxiliary equipment and the elimination of cooling water, fresh water is simply stored in the water tank after assembly without installing a water supply facility that maintains the cleanliness of the lubricating water, and then evaporated. It is desired to be able to operate with a simple water supply method of appropriately replenishing the weight loss.

  Therefore, the inventors of the present invention manufactured a water-lubricated guide bearing device for the main bearing of a water turbine and conducted a bearing performance test by the simple water supply method described above. After the test, when the sliding contact surface made of the resin material was observed, deep streaks in the circumferential direction were confirmed. This was presumed to be caused by wear damage due to foreign matter taken in due to adhesion to the bearing device and parts, remaining in the water tank, etc. when the bearing device was incorporated.

  Thus, it has been found that when the bearing device is incorporated, foreign matter may be taken into the water tank due to adhesion to the bearing device or parts, remaining in the water tank, or the like. If wear damage occurs on the sliding contact surface due to the foreign matter taken in, the bearing load capacity decreases and long-term reliability cannot be secured sufficiently.

  Therefore, in order to achieve high reliability, a bearing device that can reliably prevent damage to the sliding contact surface against temporary contamination of foreign matter into the lubricating water is indispensable. The abrasion damage on the sliding contact surface becomes more severe damage when a foreign object corresponding to the radial gap at the bearing pad inlet is caught. For this reason, if the foreign matter corresponding to the radial gap is prevented from staying at the bearing pad inlet and can be allowed to flow in the radial direction, wear damage of the bearing pad sliding contact surface can be prevented. In addition, foreign matter mixed in the water tank is settled at the bottom of the water tank at the time of stopping (once / day), and if the foreign matter precipitated by restarting can be prevented from rising again, the wear resistance is improved, so a long-life bearing device is achieved. it can.

  In a water turbine, a water-lubricated segment type bearing device in which a sliding contact surface is formed of a resin material and uses a lubricant as water as a bearing device for supporting the rotating shaft is disclosed in Patent Document 1. The water-lubricated segment type bearing device disclosed in Patent Document 1 includes a sleeve mounted on a rotating shaft, a bearing case disposed on the outer periphery of the sleeve, and a sleeve in the circumferential direction between the sleeve and the bearing case so as to be in sliding contact with the sleeve. A plurality of bearings that are segmented along the surface, and an elastic pressing mechanism P that elastically presses the sliding contact surface of the bearing against the sliding contact surface of the sleeve; And a polyphenylene sulfide-based resin or a fluorine-based resin is used for the resin material of the resin portion.

  For this reason, since it is excellent in impact resistance and cost compared with a ceramic material, the handling property at the time of disassembling and assembling the bearing device can be improved, and the cost of the bearing device can be reduced. On the other hand, since the bearing pad has a fan shape, in the unlikely event that foreign matter is mixed in the water tank, there is a possibility that the foreign matter stays at the bearing pad inlet and bites into the bearing sliding contact surface.

  Further, Patent Document 2 discloses a segmental type water turbine main bearing having a pad as a water-lubricated bearing. This water turbine main bearing has a pad divided into a plurality of parts between the main shaft and the bearing body, and the area is 40% or more of the pad back surface area, and the thickness is 0.02 to 0.2 times the bearing diameter. The body is placed on the back of the pad. The elastic body has a centering ability equivalent to that of a metal pad, and the pad tilts freely, and an appropriate wedge-shaped water film is formed between the main body and the elastic body. With such a turbine main bearing, lubrication can be performed with water, and a turbine plant that does not require oil can be put to practical use. This segmental pad has a fan shape, and it can be predicted that lubricating water stays on the pad inlet side and hardly flows in the radial direction.

  Further, Patent Document 3 discloses a guide bearing device for a rotating electrical machine having a guide sector that supports the load of a rotating body as a bearing device that enables water lubrication. This guide bearing device uses a material in which a polymer material polyether ether ketone is filled with a fiber material as a sliding surface material of a guide sector, and a lubricating fluid such as water having a viscosity lower than that of turbine oil between the rotating body and the guide sector. And the guide sector is installed in a state of being pressed against the rotating body. In such a guide bearing device, excessive vibration is not generated in the rotating body during operation, and even if the sliding surface material of the guide sector comes into contact with the rotating body, damage can be suppressed to a minimum, and the operation of the rotating electrical machine can be suppressed. Can continue. Further, since a lubricating fluid having a viscosity lower than that of the turbine oil is used, loss generated in the guide bearing device can be reduced.

  On the other hand, a tilting pad bearing is disclosed in Patent Document 4 as an oil lubricated bearing device. In this tilting pad bearing, a plurality of bearing pads for supporting a rotating shaft are supported in a freely tilting manner by a pivot fixed to a housing. Between these pads, an oil supply nozzle for supplying lubricating oil was installed in a tangential direction with respect to the rotary shaft, and was installed close to the gap opening between the front edge of the pad and the rotary shaft. In this way, a lot of new cooled oil is supplied to the bearing gap opening, so the cooling efficiency of the bearing is remarkably increased, and the bearing temperature rise and fluctuation can be prevented, greatly improving the lubrication function of the bearing. There is an effect to make.

  Further, Patent Document 5 discloses an oil-lubricated tilting pad bearing device. This tilting pad bearing device has a plurality of circumferential grooves on the outer peripheral surface of each tilting pad or the inner peripheral surface of the housing facing the tilting pad, and a plurality of lubricant oils are directly ejected to the grooves or the outer peripheral surface. A small-diameter orifice is arranged on the oil supply piece installed between the housing or the respective tilting pads adjacent in the circumferential direction. By comprising in this way, the supply lubricating oil in a tilting guide bearing apparatus can be used efficiently, a temperature rise can be prevented, and the bearing which has the stable high characteristic can be provided.

JP 2005-249030 A JP-A-8-86268 JP 2003-28146 A JP-A-5-26230 JP-A-7-293554

  In a water turbine, it is desirable that water be used as a lubricant in the guide bearing device in terms of preventing river contamination due to oil spills, simplifying auxiliary equipment, and eliminating cooling water. However, when the lubricant of the guide bearing device is changed from oil to water, it is required to have high wear resistance against foreign matters of the resin material used for the sliding contact surface.

  Patent Document 1 discloses a water-lubricated bearing device in which a sliding contact surface is formed of a resin material. Since the bearing pad is made of a resin material applied to the sliding surface, stable bearing performance can be maintained for a long time when clean water is used as the lubricating water. However, if a foreign object or the like is mixed in the water tank when the bearing is assembled, the foreign object may float in the lubricating water during operation and bite into the sliding contact surface. As a result, there is a concern about a decrease in bearing load capacity due to wear damage on the sliding contact surface, and sufficient consideration is not given to long-term reliability.

  Further, Patent Document 2 discloses a segmental type water turbine main bearing having a pad as a water-lubricated bearing. The pad used in this water turbine main bearing has the same aligning ability as a metal pad, and the pad tilts freely and forms an appropriate wedge-shaped water film between the main shaft and stable bearing. Performance can be maintained. On the other hand, assuming that water from rivers is used as lubricating water, if foreign matter is mixed in, the segmental pad shows a fan shape, so foreign matter can easily stay on the pad inlet side. This increases the probability of entering the sliding surface of the pad. As a result, damage due to foreign matter may not be avoided. Therefore, sufficient consideration is not given to use under lubrication conditions in which foreign matter should be mixed into water such as rivers.

  Further, Patent Document 3 discloses a guide bearing device for a rotating electrical machine having a guide sector that supports the load of a rotating body as a bearing device that enables water lubrication. This guide bearing device uses a material in which a polymer material polyether ether ketone is filled with a fiber material as a sliding surface material of a guide sector, and a lubricating fluid such as water having a viscosity lower than that of turbine oil between the rotating body and the guide sector. And the guide sector is installed in a state of being pressed against the rotating body. In this bearing device using a guide sector, a resin material in which a polyether ether ketone is filled with a fiber material is used as the sliding surface material, so that sufficient wear resistance should be provided if foreign matter is mixed into the water. May not be obtained. Therefore, sufficient consideration is not given to the resin material against foreign matter mixing into the lubricating water.

  On the other hand, a tilting pad bearing is disclosed in Patent Document 4 as an oil lubricated bearing device. In this tilting pad bearing, a plurality of bearing pads for supporting a rotating shaft are supported in a freely tilting manner by a pivot fixed to a housing. Between these pads, an oil supply nozzle for supplying lubricating oil was installed in a tangential direction with respect to the rotary shaft, and was installed close to the gap opening between the front edge of the pad and the rotary shaft. By doing so, the cooling efficiency of the bearing is remarkably increased, the temperature rise and fluctuation of the bearing can be prevented, and the lubricating function of the bearing can be greatly improved. However, with such a pad shape, if foreign matter enters from the outside, oil containing the foreign matter tends to stay at the pad inlet, and the probability that the foreign matter will enter the sliding surface increases. For this reason, sufficient consideration has not been given to preventing damage to the entry of foreign matter from the outside.

  Patent Document 5 also discloses an oil-lubricated tilting pad bearing device. In this tilting pad bearing device, it is possible to provide a bearing having a stable and high characteristic by efficiently using the supplied lubricating oil and preventing a temperature rise. Under such conditions, stable high characteristics may not be obtained. Therefore, sufficient consideration has not been given to the stabilization of characteristics against external contamination by foreign matters.

  As described above, in the known example, in the guide bearing device used in the water environment, sufficient improvement in the wear resistance of the sliding contact surface is required to maintain stable bearing performance even in the event of foreign matter contamination during assembly. Not considered.

  The object of the present invention is to prevent wear damage to the sliding contact surface even if foreign matter is mixed in with the bearing pad using a resin material for the sliding contact surface to be used in a water environment, and to maintain stable bearing performance. It is an object of the present invention to provide a water-lubricated guide bearing device that can be maintained for a period of time and a water turbine equipped with the same.

  The above-mentioned purpose is to use a resin material for the sliding contact surface in a water-lubricated guide bearing device that supports the rotating shaft of a rotating machine, and this resin material protrudes several millimeters from the metal case to the sliding contact side and is stored and fixed in the metal case. A plurality of bearing pads are arranged around the rotating shaft, and the dimensional relationship between the inner chord length (B) and the outer chord length (b) of the metal case of the bearing pad is set to B ≧ b. Is achieved.

  Moreover, the said objective is achieved by inclining the circumferential direction both end surfaces of the said metal case.

Further, the object is to arrange a plurality of bearing pads each having a resin material joined to the sliding surface side of the metal base metal around the rotating shaft, and to determine the inner chord length (B) of the bearing pad and the outer circumference. This is achieved by setting the dimensional relationship with the side chord length (b) to B ≧ b.

  Further, the above object is achieved by inclining both end faces in the circumferential direction of the bearing pad.

  ADVANTAGE OF THE INVENTION According to this invention, the water lubrication guide bearing apparatus which can prevent the abrasion damage of a slidable contact surface, and can maintain the stable bearing performance for a long period of time, and a water turbine carrying the same can be provided.

  Embodiments of the present invention will be described below with reference to the drawings.

  In the second and subsequent embodiments, the redundant description of the configuration common to the first embodiment is omitted, and the same reference numerals in the drawings of the respective embodiments indicate the same or equivalent. In the present invention, the shape of both end surfaces in the circumferential direction of the bearing pad is devised, so the bearing pad will be described in detail here, and the configurations of the water-lubricated guide bearing device and the water wheel are shown in FIGS. And with reference to FIG.

FIG. 1 is a view showing the shape of a bearing pad A according to the first embodiment.
In FIG. 1, the bearing pad A uses a resin material 1 on the sliding contact surface, and protrudes several millimeters from the spindle sleeve 2 toward the sliding contact surface side, and is stored and fixed on the spindle sleeve 2. Both direction end surfaces A1 and A2 are inclined. In this way, the slanting causes foreign matter to flow to the circumferential end surface A1 side at the inlet side A3 portion of the spindle sleeve 2, and it is difficult for the foreign matter to stay in this vicinity. Therefore, it is possible to prevent the foreign matter from getting into the sliding contact surface as compared with the case where it is not inclined as in the conventional example. The angle A4 of the inclined surface is determined by the peripheral speed of the spindle sleeve and the size of the bearing pad, and is not particularly limited.

FIG. 2 is a view showing a state in which a plurality (eight in this case) of bearing pads A to H according to the present embodiment are arranged around the spindle sleeve 6.
In FIG. 2, in this case, the bearing pads A to H are installed in a state of being immersed in the lubricating water. The main shaft sleeve 2 is fixed to the outer peripheral surface of the rotating shaft 4 and rotates in synchronization with the rotating shaft 4. The load acting on the rotary shaft 4 is supported by the bearing pads A to H via the main shaft sleeve 6. Both end surfaces in the circumferential direction of the bearing pads A to H are inclined at a constant angle in the radial direction from the sliding contact surface side, and the inclined surfaces are not inclined outward (radial direction) from a certain position. The movement of the foreign matter when the spindle sleeve 6 rotates counterclockwise in a state where the bearing pad having such a shape is submerged in the lubricating water mixed with the foreign matter will be described by paying attention to the bearing pad A.

  When the circumferential end surfaces A1 on the inlet side of the bearing pad A1 and the circumferential end surfaces A2 on the outlet side are defined, the retention of foreign matter contained in the lubricating water can be eliminated at the inlet side portion of the bearing pad A, and most of the foreign matter is peripheral. It flows through the direction end faces A1 and scatters in the radial direction. Further, the lubricating water moves by being dragged by the radial flow on the inlet side of the next bearing pad B at the circumferential end surfaces A2 on the outlet side. A similar flow also occurs on the circumferential end surfaces A1 to H1 on the bearing pad inlet side of A to H, and most of the foreign material flows through the inclined surfaces and scatters in the radial direction.

  Accordingly, since the foreign matter biting into the sliding contact surface of each bearing pad is drastically reduced, it is possible to provide a water-lubricated guide bearing device that can prevent wear damage on the sliding contact surface and maintain stable bearing performance for a long period of time.

  As described above, by inclining both end faces in the circumferential direction of the bearing pad, the flow velocity on the inclined surface increases on the inlet side, and the radius on the inlet side in the next bearing pad on the inclined surface on the outlet side. Since the lubricating water moves by being dragged by the directional flow, the heat transfer coefficient at each inclined surface is improved and the heat dissipation is improved. As a result, the frictional heat on the sliding contact surface can be efficiently dissipated, so the viscosity of the lubricating water on the sliding contact surface is improved and the load capacity can be improved. Since the load capacity can be improved, the bearing pad can be increased in surface pressure and the pad can be downsized. The cost of the guide bearing device can be reduced by reducing the size of the bearing pad. Furthermore, since the concentration of foreign matter contained in the lubricating water in the vicinity of the bearing pad inlet side is reduced, erosion caused by foreign matter on the bearing sliding contact surface is reduced, which is effective for extending the life of the bearing pad.

FIG. 3 is a view showing the shape of the bearing pad A according to the second embodiment.
In FIG. 3, the bearing pad of the present embodiment is basically the same as the bearing pad A of the first embodiment, except that the inclined surfaces formed on both end surfaces in the circumferential direction of the metal case are all over the radial direction. This is because the dimensional relationship between the inner chord length (B) and the outer chord length (b) is set to B> b. Here, the dimensional relationship of the inclined surface formed on the bearing pad A is set to B> b. However, considering the function of the inclined surface, a flow in the radial direction occurs even under the condition of B = b, and the foreign matter Therefore, it is desirable to satisfy B ≧ b.

  In this embodiment, since the inclined surface can be easily processed, the cost of the bearing pad can be reduced. Since the other configuration is the same as that of the first embodiment, the above effect can be obtained.

FIG. 4 is a view showing a state in which a plurality (eight in this case) of bearing pads A to H according to the second embodiment are arranged around the spindle sleeve 6.
In FIG. 4, in this case, the bearing pads A to H are installed in a state of being immersed in the lubricating water. The main shaft sleeve 2 is fixed to the outer peripheral surface of the rotating shaft 4 and rotates in synchronization with the rotating shaft 4. The load acting on the rotary shaft 4 is supported by the bearing pads A to H via the main shaft sleeve 6. The inclined surfaces formed on both end surfaces in the circumferential direction of the bearing pads A to H are installed over the entire radial direction, and the dimensional relationship between the inner chord length (B) and the outer chord length (b) is represented by B > B.

  The movement of the foreign matter when the spindle sleeve 6 rotates counterclockwise in a state where the bearing pad having such a shape is submerged in the lubricating water mixed with the foreign matter will be described by paying attention to the bearing pad A. When the circumferential end surfaces A1 on the inlet side of the bearing pad A1 and the circumferential end surfaces A2 on the outlet side are defined, the retention of foreign matter contained in the lubricating water can be eliminated at the inlet side portion of the bearing pad A, and the foreign matter is removed at both ends in the circumferential direction. It flows through the surface A1 and scatters in the radial direction. Further, at both end surfaces A2 in the circumferential direction on the outlet side, the lubricating water moves inwardly by being dragged by the radial flow on the inlet side in the next bearing pad B. A similar flow also occurs on the circumferential end surfaces A1 to H1 on the inlet side of the bearing pads A to H, and foreign matter flows through the inclined surfaces and scatters in the radial direction. In this embodiment, since the bearing pad that can easily process the inclined surface is disposed, a low-cost guide bearing device can be provided. Since the other configuration is the same as that of the second embodiment, the above effect can be obtained.

FIG. 5 is a view showing the shape of the bearing pad according to the third embodiment.
In FIG. 5, the bearing pad of this embodiment is basically the same as the bearing pad in the second embodiment, but the difference is that the resin material is joined to the sliding surface side of the metal base metal. There is. The bonding method of the resin material is not particularly limited as long as it can achieve high reliability. In this embodiment, since the resin material is bonded to the sliding surface side of the metal base metal, the resin material can be applied to the entire area of the metallic base metal sliding surface, and the sliding contact area of the bearing pad can be increased. Contributes to improved bearing load capacity. Since the other configuration is the same as that of the first embodiment, the above effect can be obtained.

Next, a water lubrication guide bearing device to which the bearing pad of the present invention is applied will be described.
FIG. 6 is a longitudinal sectional view of the water-lubricated guide bearing device.
In FIG. 6, the water lubrication guide bearing device 30 includes a sleeve 6, a bearing case 8, a bearing pad A, an elastic pressing mechanism P, an elastic support mechanism S, and a lubricating water storage frame W as main elements. The sleeve 6 has a skirt portion 5. The sleeve 6 is fixedly attached to the rotating shaft 4 via the skirt portion 5 and functions to receive sliding contact support of the rotating shaft 4 by the bearing pad A. The sleeve 6 has a cylindrical structure that can be divided into two along the periphery of the skirt portion 5, and the divided semi-cylindrical member is fastened by a reamer bolt 7. As for the sleeve material, the sliding contact surface is quenched by SUS403.

  The bearing case 8 has a cylindrical shape and is disposed on the outer periphery of the sleeve 6. Further, a lower plate 8a is attached to the lower end in the axial direction, and an upper plate 8b is attached to the upper end. The lower plate 8a and the upper plate 8b surround the upper and lower end surfaces of the bearing pad A.

  As shown in FIG. 1, the bearing pad A uses a resin material for the sliding contact surface Aa, protrudes several millimeters from the spindle sleeve 2 to the sliding contact surface side, and is stored and fixed to the spindle sleeve 2, and further, the spindle Both end surfaces A1, A2 in the circumferential direction of the sleeve 2 are inclined. A plurality of bearing pads A are disposed between the sleeve 6 and the bearing case 8 so as to be in sliding contact with the sleeve 6 along the circumferential direction of the sleeve 6.

In this way, by inclining the both end faces of the bearing pad A, the foreign matter flows to the circumferential end faces A1 at the inlet side A3 portion of the spindle sleeve 2, and the foreign matter does not easily stay in the vicinity. . Therefore, in comparison with a bearing pad that is not inclined as in the conventional example, it is possible to prevent foreign matter from getting into the sliding contact surface and to improve wear resistance, so that stable bearing performance can be maintained for a long time. Further, since the carbon fiber-containing PPS resin is used for the sliding contact surface Aa of the bearing pad A, stable sliding characteristics can be exhibited.

  The elastic pressing mechanism P elastically supports the bearing pad A in the radial direction of the rotating shaft 4. For this purpose, the elastic pressing mechanism P includes a compression coil spring 10 that elastically biases the bearing pad A with respect to the sleeve 7 in the radial direction of the rotary shaft 4 and an adjustment body 11 that adjusts the spring force of the compression coil spring 10. It is a main element.

  The compression coil spring 10 has a suitable depth between the pair of opposing walls 12 and 12 projecting so as to face the outer peripheral surface of the bearing pad A and the opposing walls 12 and 12. One end of the groove 13 is pressed against the bearing pad A at the bottom of the groove 13 and the other end is pressed against the adjusting body 11 via the leaf spring 14 in a state where the groove 13 formed by cutting is held in the space formed. It is provided to be supported.

  The adjusting body 11 is formed with a bolt structure screwed into a screw hole 15 formed so as to penetrate the bearing case 8 in the radial direction, and the leaf spring 14 is adjusted by adjusting the screwed state into the screw hole 15. The pressing force applied to the compression coil spring 10 via the screw can be adjusted, and the screwed state can be fixed by the nut 17. The adjustment body 11 has a slightly spherical tip surface, and is pressed against the central portion of the leaf spring 14 with the spherical tip surface. Here, the leaf spring 14 interposed between the compression coil spring 10 and the adjusting body 11 bears the alignment function of the bearing pad A, and the compression coil spring 10 is paired so as to be sandwiched vertically in the state of FIG. Both ends are supported by the pivots 18 and 18 provided, and the center is pressed and supported by the spherical tip surface of the adjustment body 11 as described above.

  The elastic support of the bearing pad by the elastic pressing mechanism P as described above has two functions. One is that the sliding contact surface Aa of the bearing pad is pressed against the sliding contact surface 6a of the sleeve when the rotary shaft is stopped, so that hard particles contained in the lubricating water are brought into contact with the sliding contact surface Aa of the bearing pad and the sleeve. It is a function which prevents entering between the sliding contact surfaces 6a. The other is that if there is a case where the sliding contact surface Aa of the bearing pad is worn, the gap between the sliding contact surface Aa and the sliding contact surface 6a is prevented from expanding due to the wear. This is a function of maintaining a gap suitable for forming a water film. Thus, by providing the elastic pressing mechanism P, it becomes possible to effectively cope with the problem of wear of the sliding contact surface. In addition, since the carbon fiber-containing PPS resin is used for the sliding contact surface of the bearing pad, stable sliding characteristics can be obtained under the condition of water lubrication.

  The elastic support mechanism S is formed by a coil spring 19 provided between the lower plate 8a of the bearing case 8 and the lower end surface of the bearing pad, and the bearing case has a function of elastically supporting the bearing pad. . Since the bearing pad A is elastically supported by the elastic support mechanism S, an appropriate biasing force by the compression coil spring in the elastic pressing mechanism P can be applied to the bearing pad more stably. become. As a result, the followability of the bearing pad is improved, and the water film formation in the gap between the sliding contact surface 6a and the sliding contact surface Aa during the rotation of the rotating shaft 4 becomes more stable. It is possible to effectively prevent damage caused by contact of the bearing pads. Two or more coil springs 19 are preferably provided in order to make the elastic support of the bearing pad more stable.

The lubricating water storage frame W is for storing water used for lubrication of the sliding contact surface 6a and the sliding contact surface Aa. The inner cover 31 and the outer cover 32 attached to the bearing case 8 respectively, and FIG. A top plate portion 43 is formed so as to be enclosed in a bowl shape, and an upper plate 33 for preventing scattering of lubricating water is provided on the upper portion thereof.

  As described above, the water-lubricated guide bearing device to which the bearing pad of the present invention is applied can provide stable sliding characteristics and sufficient wear resistance even if foreign matter is mixed.

  The structure for preventing the foreign matter from getting into the sliding contact surface of the bearing pad has been described. From the viewpoint of further improving the wear resistance, the invention for preventing the re-floating of the foreign matter once deposited on the bottom of the bearing case will be described.

FIG. 7 is a longitudinal cross-sectional view of a guide bearing device to which the bearing pad of the present invention is applied and in which a swirl flow restraining means for preventing re-floating of foreign matters deposited on the upper surface of the lower plate of the bearing case is added.
FIG. 8 is a diagram for explaining a ring-shaped member showing the swirl flow suppressing means.
7 and 8, the swirl flow restraining means 50 is installed in a gap surrounded by the lower surface Ab of the bearing pad A, the upper surface 51 of the lower plate 8a of the bearing case 8 and the inner surface 53 of the support base 52 of the leaf spring 14. . As shown in FIG. 8, the swirl flow restraining means 50 is a ring-shaped member, and includes an inner plate 50a, a bottom plate 50b, an outer plate 50c, a top plate 50d, and a stop plate 50e. Among these, the inner plate 50a, the outer plate 50c, and the stop plate 50e are SUS304 plates. The bottom plate 50b and the top plate 50d are holed steel plates (made of SUS304). A plurality of stop plates 50e are installed in the circumferential direction. The behavior of the foreign matter will be described with reference to FIG. When the rotating shaft stops, the foreign matter dispersed in the lubricating water settles with time, passes through the top plate constituting the swirl flow restraining means 50, and accumulates on the upper surface of the bottom plate 50b. Even if the rotating shaft rotates, the lubricating water inside the swirling flow restraining means 50 is partitioned by the inner plate 50a, so that the lubricating water does not swirl and is almost stationary and prevents foreign matter from being stirred. . As a result, the re-floating of the foreign matter can be avoided and the foreign matter contained in the lubricating water is gradually reduced, so that the wear damage of the resin material on the sliding contact surface can be reduced. Therefore, by inclining both end faces of the bearing pad and adding swirl flow suppression means, even if there is a foreign matter mixed in the water tank, it can be removed from the lubricating water near the sliding contact surface. It can contribute to the high reliability of the device.

FIG. 9 is a view for explaining a water turbine to which the water lubrication guide bearing device 30 is applied.
In FIG. 9, the water wheel is a rotating shaft 4, a runner 41 fixed to the lower portion of the rotating shaft 4, a fixed body 42 that is disposed above the runner 41, and passes through the rotating shaft 4. And a water-lubricated guide resin bearing device 30 of this embodiment. The fixed body 42 has a hollow shape. The rotary shaft 4 is supported on the top plate portion 43 via the water-lubricated guide resin bearing device 30, and a shaft seal device 45 is provided between the upper cover 44 and the rotary shaft 4. Yes. A casing 47 is formed by the upper cover 44 and the lower cover 46 of the fixed body 42, and the flow rate of water flowing from the casing 47 into the runner 41 is adjusted by the guide vane 48. The guide vane 48 is connected to a guide ring 49 provided on the casing 47 and is driven by a hydraulic servo (not shown). The water-lubricating guide resin bearing device 30 includes a sleeve 6, a bearing case 8, a bearing pad 9, an elastic pressing mechanism P, and an elastic support mechanism S, when roughly classified. Since the water-lubricated guide bearing device is mounted in this way, there is no concern about river pollution, and an environmentally friendly water wheel can be achieved. Further, since it is a water lubrication system, it is not necessary to periodically replace the lubricating oil as in the case of a conventional bearing, and maintenance costs can be saved.

  The water-lubricated guide bearing device to which the bearing pad of the present invention is applied can be suitably used for supporting a rotating shaft in a rotating machine in which water is involved such as a water wheel. The present invention for improving the high wear resistance of such a bearing pad can be used as an effective tool in the field of rotating machinery involving water.

  As described above, according to the present invention, the resin pad is used for the sliding contact surface of the bearing pad constituting the water-lubricated guide bearing device, and the resin material is protruded several millimeters from the metal case to the sliding contact side. The dimensional relationship between the inner chord length (B) and the outer chord length (b) of the metal case of the bearing pad is set to B ≧ b or both ends of the bearing pad in the circumferential direction are stored. The surface is inclined. With the bearing pad configured in this manner, the retention of lubricating water at the bearing inlet can be eliminated, and most of the foreign matter flows through the inclined surface and scatters in the radial direction. As a result, the foreign matter biting into the sliding contact surface of the bearing pad is drastically reduced, so that it is possible to provide a water-lubricated guide bearing device capable of preventing wear damage on the sliding contact surface and maintaining stable bearing performance over a long period of time.

It is explanatory drawing which shows the shape of the bearing pad which concerns on Example 1 of this invention. It is explanatory drawing which shows the arrangement | positioning condition of the bearing pad which concerns on Example 1 of this invention. It is explanatory drawing which shows the shape of the bearing pad which concerns on Example 2 of this invention. It is explanatory drawing which shows the arrangement | positioning condition of the bearing pad which concerns on Example 2 of this invention. It is explanatory drawing which shows the shape of the bearing pad which concerns on Example 3 of this invention. It is sectional drawing which shows the water-lubrication guide bearing apparatus of this invention. It is sectional drawing which shows another water lubrication guide bearing apparatus of this invention. It is explanatory drawing of the ring-shaped member which shows the swirl | vortex flow suppression means of this invention. It is sectional drawing which shows the water turbine carrying the water lubrication guide bearing apparatus of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Resin material, 2 ... Main shaft sleeve, 4 ... Rotary shaft, 6 ... Sleeve, 8 ... Bearing case,
DESCRIPTION OF SYMBOLS 10 ... Compression coil spring, 11 ... Adjustment body, 12 ... Opposite wall, 14 ... Plate spring, 19 ... Coil spring, 22 ... Metal base metal, 31 ... Inner cover, 32 ... Outer cover, 33 ... Upper plate, 41 ... Lanna,
42 ... a fixed body, 43 ... a top plate part, 44 ... an upper cover, 46 ... a lower cover, 47 ... a casing,
DESCRIPTION OF SYMBOLS 50 ... Swirling flow suppression means, AH ... Bearing pad, A1, A2 ... Circumferential end surface, P ... Elastic pressing mechanism, S ... Elastic support mechanism, W ... Lubricating water storage frame.

Claims (5)

In the water-lubricated guide bearing device that supports the rotating shaft of the rotating machine,
A resin material is used for the slidable contact surface, and a plurality of bearing pads are provided around the rotating shaft so that the resin material protrudes several millimeters from the metal case to the slidable contact surface side and is fixed in the metal case. A water-lubricated guide bearing device characterized in that a dimensional relationship between an inner circumferential chord length (B) and an outer circumferential chord length (b) of the metal case is set to B ≧ b. The water-lubricated guide bearing device according to claim 1,
A water-lubricated guide bearing device characterized in that both end surfaces in the circumferential direction of the metal case are inclined. In the water-lubricated guide bearing device that supports the rotating shaft of the rotating machine,
A plurality of bearing pads in which a resin material is joined to the sliding surface side of the metal base metal are arranged around the rotation shaft, and the inner circumferential chord length (B) and outer circumferential chord length ( A water-lubricated guide bearing device, wherein the dimensional relationship with b) is set to B ≧ b. The water-lubricated guide bearing device according to claim 3,
A water-lubricated guide bearing device characterized in that both end surfaces in the circumferential direction of the bearing pad are inclined. In a water turbine having a rotating shaft supported by a bearing device,
The water turbine according to any one of claims 1 and 2, wherein the water lubrication guide bearing device is used as the bearing device.

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