JP5021576B2 - Pad type bearing device and horizontal axis turbine - Google Patents

Description

  The present invention relates to a pad-type bearing device that supports a horizontal rotating shaft using water as a lubricant and a horizontal-axis water turbine using the pad-type bearing device, and in particular, has a bearing pad to which a resin material is applied on the sliding surface side. About.

  Oil-lubricated journal bearings and tilting pad bearings are used as bearings for supporting the rotating shaft of the horizontal axis turbine, but tilting pad bearings are frequently used from the viewpoint of load resistance. As a tilting pad bearing, as disclosed in Japanese Patent Laid-Open No. 5-332355 (Patent Document 1), two tiltable pads and no load are provided on the load side so as to support a load including the rotor's own weight. The two pads on the side and one tiltable pad are arranged in a symmetrical position with respect to the rotor axis, and each pad is connected to an external oil supply means to reach the sliding surface with the rotor. Refueling holes are provided. Since this tilting pad bearing is directly lubricated to each pad, the amount of lubrication can be saved and a reduction in loss can be achieved. Further, since two bearing pads are arranged on the load side, sufficient load resistance is ensured even for long-term use, and stable bearing performance can be obtained.

JP 05-332355 A

However, in the tilting pad bearing described in Patent Document 1, when considering using water as a lubricant as an alternative to oil, the following items are sufficiently considered: I can't say that.
1. When pressurized water is directly supplied to the bearing pad, sufficient water is supplied in the vicinity of the water supply port of the bearing pad, but there is a possibility that the lubricating water does not spread over the entire surface of the bearing pad. For this reason, there is a possibility that a partial water film breakage may occur on the sliding surface of the bearing pad, and it is considered that stable bearing performance cannot be obtained over a long period of time.
2. Since an external water supply device is used, if a trouble occurs in the pump of the water supply device, the main engine cannot be operated, so it cannot be said that it has sufficient reliability.
3. Since the sliding surface is in direct contact when starting and stopping, high load resistance is particularly required for the load-side bearing pad, but sufficient wear resistance is ensured when the bearing pad for oil lubrication is used as it is. It is expected not to be possible.

  As described above, in the known example, when it is assumed to be used under water-lubricating conditions, the lubrication structure and the wear resistance of the bearing sliding surface material are not sufficiently considered, so high reliability is ensured for a long time. There is a possibility that it cannot be maintained for a long time.

  The present invention has been made in view of the circumstances as described above. The object of the present invention is to use water as a lubricant, to reliably lubricate the bearing pad, and to provide long-term wear resistance of the bearing sliding surface. Another object is to obtain a highly reliable water-lubricated pad-type bearing device and a horizontal-axis water turbine equipped with this bearing device.

In order to achieve the above object, the present invention provides a pad-type bearing device for supporting a horizontal rotary shaft, and a plurality of bearings using a resin material on the sliding surface side so as to surround the sliding surface of the rotary shaft. The pad is arranged, the sliding surface of the bearing pad located in the lower half is immersed in lubricating water, and an initial setting gap is set so that the bearing pad located in the upper half is not in contact with the rotating shaft. Adjusted and installed, and configured to install pumping means composed of an outer peripheral surface inclined disk fixed to the rotating shaft and a case surrounding the disk at a position near both ends of the bearing pad. To do.

In order to achieve the above object, the present invention provides a pad-type bearing device for supporting a horizontal rotary shaft, wherein a sleeve is fixed to the outer peripheral side of the rotary shaft, and the sliding surface surrounds the sliding surface of the sleeve. A plurality of bearing pads using a resin material is arranged on the side, the sliding surface of the bearing pad located in the lower half is immersed in lubricating water, and the bearing pad located in the upper half is not connected to the sleeve. A pumping means comprising an outer peripheral inclined disk fixed to the rotary shaft and a case surrounding the disk at a position near both ends of the bearing pad, with the initial setting gap adjusted to be in a contact state. It is configured to be installed.

In order to achieve the above-mentioned object, the present invention surrounds a rotary shaft, a horizontal shaft, an impeller fixed to the rotary shaft, a turbine casing disposed so as to surround the outer periphery of the impeller, and the rotary shaft. In the horizontal axis turbine provided with the draft tube arranged in the above and a pad type bearing device for supporting the rotating shaft, the pad type bearing device is provided with a resin material on the sliding surface side so as to surround the sliding surface of the rotating shaft. a plurality of bearing pads employed arranged, a sliding surface of the bearing pads located in the lower half immersed in the lubricating water, comprising the bearing pads located upper half in a non-contact state with said rotary shaft The initial setting gap is adjusted as described above, and the pumping means configured by an outer peripheral surface inclined disk fixed to the rotating shaft and a case surrounding the disk is provided in the vicinity of both ends of the bearing pad. It is characterized by That.

In the above invention, more preferably, the following configuration is adopted.
(1) The resin material is made of a polyphenylene sulfide resin containing carbon as a fiber among thermoplastic resin materials.
(2) The pumping means is composed of an outer peripheral inclined disk fixed to the rotating shaft and a case surrounding the disk.

  ADVANTAGE OF THE INVENTION According to this invention, the pad type bearing apparatus which operate | moves in a fluid lubrication state using water as a lubrication agent is realizable.

  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. Here, the case where a PPS thermoplastic resin containing carbon fiber is used as the resin material used on the bearing sliding surface side will be described. However, the size and content of the carbon fiber are stable with water lubrication. The range is not particularly limited as long as it exhibits dynamic characteristics and wear resistance.

  FIG. 1 shows the arrangement of bearing pads 2 in a water-lubricated pad-type bearing device 30 according to the present invention. Three bearing pads 2 are arranged so as to surround the sliding surface of the horizontal rotation shaft 1. Each bearing pad 2 uses a resin material 3 on the sliding surface, protrudes several millimeters from the metal case 4 to the sliding surface side, and is stored in the metal case 4. The resin material 3 and the metal case 4 is manufactured by a method in which an adhesive (not shown) is filled in and fixed to a gap formed by 4.

  Further, a recess 4 a is provided on the back surface of the metal case 4. An adjustment bolt 5 having a spherical shape 5b at the tip is installed opposite to the recess 4a. The adjustment bolts 5 and 5 a are fixed to the bearing casing 6.

  The adjustment bolt 5 located on the lower side is screwed and fixed to the bearing casing 6. The adjustment bolt 5 is set in a state in which the spherical shape 5b of the adjustment bolt 5 is in contact with the recess 4a provided on the back surface of the metal case.

  A horizontal dotted line CC in the lower half of the drawing indicates the level of lubricating water. One bearing pad 2 is disposed in the lower half, and the sliding surface 3a of the bearing pad 2 is in a state of being immersed in lubricating water. Metal fittings 7 a and 7 b fixed to the bearing casing 6 are attached to both ends of each bearing pad 2. The metal fittings 7a and 7b are used to position the bearing pad 2 in the axial direction and the radial direction.

  On the other hand, two bearing pads 2 are arranged in the upper half. This bearing pad 2 is also provided with a recess 4 a on the back surface of the metal case 4. An adjustment bolt 5a facing the recess 4a and having a spherical shape 5b at the tip is provided. The adjusting bolt 5a is fixed to the bearing casing 6 by a nut 5c after adjusting the sliding surface clearance. A suspension bolt 8 is attached to a metal fitting 7a for adjusting an initial setting gap of the bearing pad 2 in the upper half. By adjusting the suspension bolt 8, it is possible to move the bearing pad caught in the protrusion on the inner peripheral side tip of the metal fitting 7a in the radial direction. The suspension bolt 8 is fixed to the bearing casing 6 by a fixing nut 8a after moving and adjusting the sliding surface of the bearing pad to a predetermined position. As a result, the recess 4a provided on the back surface of the bearing pad 2 located in the upper half and the tip of the adjustment bolt 5a (tip of the spherical shape 5b) are set with a predetermined gap.

  According to this configuration, the bearing pad 2 in the upper half can be set in a non-contact state with the outer peripheral surface of the rotating shaft, so that sliding heat generation does not occur immediately after startup, and the bearing pad 2 can be used sufficiently below the heat resistant temperature of the resin material.

  Next, the pumping means installed for lubricating the bearing pad 2 installed in the upper half will be described.

  2 is a cross-sectional view corresponding to the line AA in FIG. Pumping means 9 is disposed at both ends of the bearing pad 2. The pumping means 9 includes an outer peripheral inclined disk 10 fixed to the rotary shaft 1 and a case 13 surrounding the disk. The disk 10 includes the inclined portion 11 and the parallel portion 12 that are inclined in the axial direction. However, the disk 10 may include only the inclined portion 11. The case 13 is provided with a plurality of communication holes 19 for maintaining the lubricating water stored in the water tank 14 and the lubricating water level in the case at the same level. Therefore, when the lubricating water in the case 13 moves to the outer peripheral side by the rotation of the disk 10, it is replenished from the water tank side through the communication hole 19, and the water level is kept constant.

  In the figure, r1 is the distance from the rotation axis center to the initial water level, r2 is the radius from the rotation axis center to the non-bearing side of the disk inclined surface, and r3 is the radius from the rotation axis center to the bearing side of the disk inclined surface.

  3 is a cross-sectional view corresponding to the line BB in FIG. A structure for attaching the disk 10 constituting the pumping means 9 to the rotating shaft will be described with reference to FIG. The disk 10 is fixed to the rotary shaft 1 by bolts 18 and rotates together with the rotary shaft. The bolt 18 is buried from the end face of the disk, and disturbance of the lubricating water due to the rotation of the disk 10 can be prevented.

  The configuration of the pad type bearing device of the present invention has been described so far, and the operation will be described next. The sliding surface of the bearing pad installed in the lower half is immersed in lubricating water, and supports the weight of the rotating shaft 1 while it is stopped. In this case, since the sliding surface radius of the bearing pad is set slightly larger than the rotating shaft sliding surface radius, the sliding surface of the bearing pad is in line contact with the rotating shaft. Therefore, the lubricating water is in a state where it has permeated almost the entire sliding surface. A water film is formed on the sliding surface almost simultaneously with the activation of the rotating shaft, and operates in a fluid lubrication state. On the other hand, since the bearing pads installed in the upper half are set in a non-contact state with the rotating shaft, there is no sliding heat generated by the rotation of the rotating shaft, and the bearing pad operates in a stable lubricating state. Therefore, stable bearing performance can be obtained over a long period of time under normal operating conditions.

  On the other hand, the bearing pad in the upper half is installed to prevent the rotating shaft from floating, and it is essential that the sliding surface of the bearing pad is in a state of being reliably lubricated while the rotating shaft is rotating. is there. Lubrication of the upper half bearing pads is accomplished with lubricating water supplied by pumping means. Therefore, the operation of the pumping means will be described.

  On the surface in contact with the lubricating water on the counter bearing side of the outer peripheral surface inclined disk, the speed of the lubricating water is increased by the difference between the distance r1 from the rotation axis center to the initial water level and the radius r2 on the counter bearing side of the disk inclined surface from the rotation axis center. Water head is given. The velocity head H is calculated by the following equation.

H = [(r2 · ω) ² − (r1 · ω) ² ] / 2 / g
Here, ω is an angular velocity, and g is a gravitational acceleration.

  The size of the velocity head increases as the angular velocity ω increases. By this velocity head, the lubricating water is pushed into the gap between the outer peripheral surface inclined disk 10 and the case 13 surrounding the disk, and the lubricating water is pushed toward the apex 10 a of the outer peripheral surface inclined disk 10. The height at which the lubricating water is pushed in varies depending on the angular velocity, but under normal operating conditions, it easily reaches the apex 10a of the outer circumferential inclined disk 10 and fills the gap. The lubricating water filled in the gap is given a velocity head h that feeds water to the bearing side due to the difference between the radius r2 of the disk inclined surface opposite the bearing side from the center of the rotating shaft and the radius r3 of the disk inclined surface from the rotating shaft center. The

  h can be calculated as follows.

h = [(r3 · ω) ² − (r2 · ω) ² ] / 2 / g
Here, ω is an angular velocity, and g is a gravitational acceleration.

  The lubricating water pushed into the gap between the outer peripheral inclined disk 10 and the case 13 is discharged to the bearing side by the velocity head h. Lubricating water is supplied to both end portions 15 of the bearing pad and the inlet side 16 and outlet side 17 of the bearing pad installed in the upper half. During rotation, lubricating water can be continuously supplied around the bearing pad installed in the upper half. Therefore, since the lubricating water can be stably supplied to the upper half bearing pad so as to surround the bearing pad, stable sliding characteristics can be obtained.

  Since the case 13 provided so as to surround the outer peripheral inclined disk 10 is provided with a communication hole 19 in a portion in contact with the lubricating water in the lower half portion, the case 13 is replenished into the case 13 from the water tank side, and the level of the lubricating water is lowered. Stable without doing. For this reason, the water level at which the outer peripheral inclined disk contacts the lubricating water is also constant, and a stable pumping function can be maintained. The bearing pad in the lower half is supported by an adjustment bolt with a spherical shape at the tip so that it faces and comes into contact with the recess on the back of the metal case. Bearing performance can be demonstrated. In addition, even if a load is generated, the bearing pads installed in the upper half have sufficient lubricating water, so that stable sliding characteristics can be obtained. When the rotating shaft floats, the bearing pad in the upper half is supported by the tip of the adjustment bolt and the bearing function is exhibited. Moreover, since the loss which generate | occur | produces with the bearing pad of an upper half part under normal driving | running conditions can be reduced, it can contribute to the reduction in loss as a bearing apparatus.

  FIG. 4 shows a second embodiment of the pad type bearing device according to the present invention. In this embodiment, the difference from the first embodiment is that a two-piece sleeve 20 is fixed to the outer peripheral portion of the rotating shaft in an integral ring shape by welding or the like (weld bead 20a). Here, the sleeve 20 is fixed to the rotating shaft by welding, but the fixing method is not particularly limited.

  According to this embodiment, basically the same effects as the first embodiment described above can be obtained, and if the sliding surface of the rotating shaft is damaged, the sleeve can be replaced. Compared with the replacement, the replacement cost is low, so the maintenance cost can be saved. Moreover, when it is going to apply a pad type bearing apparatus to an existing plant, since it becomes applicable by fixing only a sleeve to an existing rotating shaft, it is effective for application expansion.

  A PPS (polyphenylene sulfide) resin material containing carbon fiber is used for the sliding surface of the bearing pad. In order to confirm the effect, the change over time in the coefficient of friction with repeated start / stop and the change in the amount of wear before and after the test were measured.

  In the test, the friction coefficient and wear resistance of the PPS were examined in the case where the test was kept in contact at rest and the start / stop operation in which the water film became non-contact after the start was repeated.

  In tap water, the relationship between the wear amount of PPS and the number of start / stops was measured in a combination using PPS for the sliding part of the bearing and SUS403 for the sleeve of the rotating shaft.

  As test conditions, contact was made at a surface pressure of 0.24 MPa when stationary, and after starting, it was held for 5 minutes after reaching a peripheral speed of 8 m / s. After that, when the stop and stop time of 5 minutes passed, the starting pattern was repeated. The number of tests was set to about 4000 times equivalent to 10 years by starting / stopping once / day.

  FIG. 5 shows the evaluation results of the wear resistance against repeated starting and stopping. As shown in FIG. 5, the friction coefficient slightly increased with the increase in the number of activations, but remained almost constant after 2000 tests and was stable at about 0.3. From this result, it was confirmed that even if the starting and stopping were repeated, the friction coefficient was not greatly changed and was stable. The material used for the sliding surface from the starting power of the main engine is required to have the same starting / stopping friction coefficient as that of conventional oil lubrication (starting / stopping friction coefficient when white metal is used is about 0.3). If this value is exceeded, the capacity of the starter of the main engine and the bearing lifter will be required, and this is not applicable. The bearing sliding surface material selected this time has the same starting and stopping coefficient of friction as the conventional one, and it was found that a new starting machine and bearing lifter are unnecessary, and this material can be used. Furthermore, it is only necessary to remodel the bearing portion considering oil-free bearings, and a low-cost environment-friendly bearing can be provided. Further, it was found that the protrusion height from the metal case of the resin material in the vicinity of both ends of the bearing pad on the load side before and after the test hardly changed and was not worn. As described above, the reason why the wear resistance is excellent is that the PPS resin contains carbon fiber, so that the unevenness caused by the hardness difference is caused by the dynamic pressure of the surface roughness formed on the sliding surface. It can be presumed that the load resistance is improved as compared with the case where there is no carbon fiber. In addition, it is considered that the carbon fiber has good compatibility with PPS and is difficult to fall off, which contributes to the improvement of wear resistance. Further, since the carbon fiber contains graphite, it exhibits low friction characteristics.

  The case where the pad type bearing device of the present invention is mounted on a horizontal axis turbine will be described below.

  The horizontal water turbine shown in FIG. 6 includes a rotating shaft 1, an impeller 41 fixed to the right side of the rotating shaft 1, a water turbine casing 42 that surrounds the impeller 41, and a draft tube 43 that is disposed so as to surround the rotating shaft 1. And a pad-type bearing device 30 for supporting the rotating shaft 1. The flow rate of water flowing from the water turbine casing 42 into the runner 41 is adjusted by the guide vane 44. The guide vane 44 is connected to a guide ring 45 provided on the water turbine casing 42 and is driven by a hydraulic servo (not shown). A seal 46 is provided between the rotating shaft 1 and the draft tube 43 to prevent fluid leakage. The pad type bearing device 30 is fixed to the mount 47.

  The pad-type bearing device 30 is broadly divided into a rotary shaft 1 and three bearing pads using a resin material on the sliding surface side so as to surround the sliding surface of the rotary shaft 1. The bearing pad sliding surface located in the section is immersed in the lubricating water, the pumping means near the both ends of the bearing pad, the water supply pipe 50 for replenishing the decrease due to the evaporation of the lubricating water, and the water supply pipe And a piping 51 connected to a water supply tank (not shown). Further, a water level sensor 49 that detects a decrease in the amount of lubricating water is provided. The electromagnetic valve is opened by the information on the water level drop from the water level sensor 49 to supply water, and when the water level returns to a predetermined value, the electromagnetic valve is closed to stop water supply. Further, in this embodiment, the pad type bearing device is provided at one place on the draft tube side. However, even if it is provided on the opposite side (shaft end side) of the draft tube and installed at two places, the same effect can be obtained. Obtainable.

  In such a pad-type bearing device, only the sliding surface of the bearing pad located in the lower half (load side) of the bearing pads arranged so as to surround the sliding surface of the rotating shaft is always immersed in the lubricating water. Therefore, since the periphery of the sliding surface of the bearing pad is surrounded by the lubricating water, it can be reliably lubricated and can be operated in a fluid lubrication state.

  On the other hand, since the bearing pads installed in the upper half are set in a non-contact state with the rotating shaft, there is no sliding heat generated by the rotation of the rotating shaft, and the bearing pad operates in a stable lubricating state. Therefore, stable bearing performance can be obtained over a long period of time under normal operating conditions.

  On the other hand, the bearing pad in the upper half is installed to prevent the rotating shaft from floating, and the sliding surface of the bearing pad can be reliably maintained lubricated by the pumping means while the rotating shaft is rotating. Therefore, stable sliding characteristics can be obtained even for long-term use.

  Therefore, stable bearing performance can be obtained even for long-term use, and it can be used as a pad-type bearing device for water lubrication of a horizontal axis turbine. In addition, because the horizontal axis turbine can be made oil-free, river pollution can be prevented, it is environmentally friendly, and maintenance-free can be achieved.

  As described above, according to the embodiments of the present invention, water is used as a lubricant, and a plurality of bearing pads using a resin material are arranged on the sliding surface side so as to surround the sliding surface of the rotating shaft. In addition, since the sliding surface of the bearing pad located in the lower half is immersed in the lubricating water and the pumping means is installed in the vicinity of both ends of the bearing pad, the water-lubricated pad type bearing A device can be obtained.

  That is, among the bearing pads arranged so as to surround the sliding surface of the rotating shaft, only the sliding surface of the bearing pad located in the lower half (load side) is always immersed in the lubricating water. Since the periphery of the sliding surface of the bearing pad is surrounded by the lubricating water, the bearing pad can be reliably lubricated and operated in a fluid lubrication state. On the other hand, since the bearing pads installed in the upper half are installed in a non-contact state, they can operate in a stable lubricating state. In addition, since the lubricating water is supplied immediately after startup by the pumping means, a water film can be formed on the sliding surface of the bearing pad installed in the upper half even if the rotating shaft may float. Stable bearing performance can be maintained. Moreover, since an external water supply device is not used, auxiliary equipment such as a pump of the water supply device can be omitted, and sufficient reliability can be ensured.

  Therefore, stable sliding characteristics can be obtained even for long-term use, and it can be mounted as a pad-type bearing device for water lubrication of a horizontal axis turbine.

  According to the preferred configuration described above, the resin material is composed of a polyphenylene sulfide resin material containing carbon fiber among thermoplastic resin materials, so that it has stable sliding characteristics and high wear resistance under water lubrication. Thus, the change in the shape of the sliding surface with respect to long-term use can be prevented, and a highly reliable state can be maintained continuously from the initial stage of operation. In addition, the glass transition temperature is as high as about 90 ° C., and when considering use under water lubrication, the resin material is optimized and low cost without sufficient heat resistance and excessive quality. .

  According to the preferred configuration of the present invention described above, the pumping means is composed of the outer peripheral surface inclined disk fixed to the rotating shaft and the case surrounding the disk, so that the water tank corresponding to the lower half of the bearing during rotation. In part, due to the speed head on the side of the disk, the lubricating water is pushed in between the outer peripheral inclined disk and the case surrounding the disk, and the water moves to the bearing side due to the speed head difference on the inclined surface, and is supplied from both ends of the bearing pad. Is done. As a result, the lubricating water is reliably supplied between the bearing pads and both ends of the bearing pads.

  The pad type bearing device of the present invention can be suitably used for supporting a rotating shaft in a rotating device involving water, such as a horizontal shaft turbine. The present invention for improving the reliability and maintenance-free improvement of such a water-lubricated pad-type bearing device can be used as an effective device in the field of rotating devices involving water.

Sectional drawing which shows arrangement | positioning of the bearing pad of the pad type bearing apparatus in one Example of this invention. Sectional drawing equivalent to the AA line of FIG. Sectional drawing equivalent to the BB line of FIG. Sectional drawing which shows the other Example of the pad type bearing apparatus of this invention. Explanatory drawing which shows the abrasion resistance at the time of start-stop repetition under the water lubrication of this invention. Explanatory drawing which shows the state which applied the pad type bearing apparatus of this invention to the horizontal axis | shaft turbine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Bearing pad 3 Resin material 4 Metal case 5, 5a Adjustment bolt 6 Bearing casing 7a, 7b Metal fitting 8 Hanging bolt 9 Pumping means 10 Outer peripheral surface inclined disk 11 Disc inclined part 12 Disc parallel part 13 Case 14 Water tank 15 Bearing pad both ends 16 Bearing pad inlet side 17 Bearing pad outlet side 18 Bolt 19 Communication hole 20 Sleeve 30 Pad type bearing device 41 Impeller 42 Turbine casing 43 Draft tube 44 Guide vane 47 Base 48 Solenoid valve 49 Water level sensor 50 Water supply pipe 51 Piping

Claims (4)

In the pad-type bearing device for supporting a horizontally placed rotating shaft, a plurality of bearing pads using a resin material are arranged on the sliding surface side so as to surround the sliding surface of the rotating shaft, and the above-described bearing located in the lower half portion Immerse the sliding surface of the bearing pad in lubricating water and install the bearing pad located in the upper half with the initial clearance adjusted so as to be in a non-contact state with the rotating shaft, and both ends of the bearing pad. A pad type bearing device comprising a pumping means comprising an outer peripheral inclined disk fixed to the rotating shaft and a case surrounding the disk at a position near the rotary shaft . In a pad-type bearing device that supports a horizontally mounted rotating shaft, a plurality of bearing pads using a resin material on the sliding surface side so as to surround the sliding surface of the sleeve, with a sleeve fixed to the outer peripheral side of the rotating shaft , So that the sliding surface of the bearing pad located in the lower half is immersed in lubricating water, and the initial setting gap is adjusted so that the bearing pad located in the upper half is not in contact with the sleeve. The pad type bearing device is provided with a pumping means comprising an outer peripheral inclined disk fixed to the rotating shaft and a case surrounding the disk at positions near both ends of the bearing pad. According to claim 1 or 2, wherein the resin material, the pad type bearing device, characterized in that the carbon in the thermoplastic resin material is polyphenylene sulfide resin containing fibers. A horizontal rotary shaft, an impeller fixed to the rotary shaft, a water turbine casing arranged so as to surround the outer periphery of the impeller, a draft tube arranged so as to surround the rotary shaft, and a support for the rotary shaft The pad-type bearing device includes a plurality of bearing pads using a resin material on the sliding surface side so as to surround the sliding surface of the rotating shaft. Dipping the sliding surface of the bearing pad located in the half part in lubricating water, adjusting the initial setting gap so that the bearing pad located in the upper half part is not in contact with the rotating shaft , A horizontal-axis water turbine comprising: a pumping means constituted by an outer peripheral surface inclined disk fixed to the rotating shaft and a case surrounding the disk at a position in the vicinity of both ends of the bearing pad.

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