JP6271624B2 - Main shaft bearing device and hydraulic machine - Google Patents

Description

  Embodiments described herein relate generally to a main shaft bearing device and a hydraulic machine.

  In a hydraulic machine such as a Francis turbine for a hydroelectric power plant, a runner that is rotationally driven by a water flow is connected to a generator via a main shaft. Of these, the main shaft is rotatably supported by a main shaft bearing device provided above the runner.

  As shown in FIG. 3, the water-lubricated bearing device 50 (main shaft bearing device) includes a bearing tub 52 provided around the main shaft 51 and a bearing pad provided in the bearing tub 52 and receiving a radial load of the main shaft 51. 53. Of these, lubricating water (W shown in FIG. 3) is stored in the bearing tank 52, and the bearing pad 53 is immersed in this lubricating water. That is, FIG. 3 shows an example of a water-lubricated bearing device that uses water as a lubricant as an example of a main shaft bearing device. The bearing pad 53 is disposed to face a main shaft skirt 54 attached to the outer peripheral surface of the main shaft 51 with a predetermined gap G therebetween.

  By the way, although oil may be used for the lubricant, when water is used, it is advantageous in that environmental influences caused by oil spill can be avoided. However, since water evaporates more easily than oil, water is periodically replenished in the bearing tub.

  In addition, the water-lubricated bearing device is limited to a hydraulic machine having a relatively small rating. However, the bearing load capacity of the bearing pad is improved, and the water-lubricated bearing device is applied to a hydraulic machine having a higher rating. It is becoming.

  However, in a hydraulic machine with a large rating, the bearing loss can increase due to the increased load. As a result, during the operation of the hydraulic machine, the temperature of the lubricating water rises and the evaporation amount of the lubricating water can increase. That is, as shown in FIG. 3, the lubricating water stored in the bearing tub 52 of the water-lubricated bearing device 50 evaporates into the gas phase space 55 formed above the surface of the lubricating water. The evaporated lubricating water vapor flows out from the tank gap 57 between the main shaft 51 and the bearing cover 56 of the bearing tank 52, and the lubricating water stored in the bearing tank 52 decreases.

  As one countermeasure for suppressing the reduction of the lubricating water, it is conceivable to enhance the capacity of the cooling device provided in the bearing tank. However, in this case, the addition of the cooling device and the capacity of the cooling device are increased, and there is a problem that the initial cost and the maintenance cost can be increased. Further, when the capacity of the cooling device is increased, the space occupied by the cooling device is increased, and there is a problem that the water-lubricated bearing device is enlarged. Further, there is a problem that condensation can occur around the bearing tub in summer. That is, the temperature of the lubricating water increases due to an increase in the ambient temperature in summer, and the evaporation amount of the lubricating water can also increase. In this case, the cooling capacity is increased and the evaporation amount of the lubricating water is reduced. However, since the temperature of the bearing tub decreases, condensation can occur on the outer surface of the bearing tub. For this reason, the enhancement of the cooling capacity is limited, it becomes difficult to reduce the evaporation amount of the lubricating water, and the frequency of replenishing the lubricating water has increased.

  As another measure for suppressing the reduction of the lubricating water, it is conceivable to provide a facility for supplying the lubricating water in the bearing tank. Specifically, it is conceivable to install a water supply pipe and supply water from the water supply pipe into the bearing tub. It is also conceivable to provide equipment for purifying river water to produce fresh water and supplying the fresh water into the bearing tub. However, in order to install such equipment, there is a problem that a lot of costs are required. In addition, when installing such equipment, since a large amount of space is required, there is a problem that it is difficult to secure a space for installing the equipment.

  In order to prevent the lubricating water from decreasing, an example in which a plurality of cooling pipes are provided in the bearing tub, and one of the cooling pipes is disposed in the gas phase space above the lubricating water. Are known. In this example, the vapor evaporated from the lubricating water can be cooled by the cooling pipe in the gas phase space, condensed on the outer surface of the cooling pipe, and dropped. Thereby, it can suppress that lubricating water evaporates and decreases. However, in order to provide the cooling pipe in the gas phase space, the production cost of the water-lubricated bearing device may increase. Further, when the cooling pipe is arranged in the gas phase space, the space occupied by the cooling pipe increases, and the water-lubricated bearing device may be increased in size to increase the installation space.

JP 2014-214859 A

  The present invention has been made in consideration of such points, and an object thereof is to provide a spindle bearing device and a hydraulic machine that can effectively reduce the frequency of supply of lubricating water at low cost.

  A main shaft bearing device according to an embodiment is a main shaft bearing device that supports a main shaft connected to a runner of a hydraulic machine. This main shaft bearing device includes a bearing tub provided around the main shaft and storing a lubricant, and a bearing pad provided in the bearing tub. The bearing pad is at least partially immersed in the lubricant stored in the bearing tank and receives the radial load of the main shaft. The gas phase space above the lubricant stored in the bearing tub is partitioned by a partition member into an external communication space that is in gas communication with the outside of the bearing tub and a non-communication space that is not in gas communication with the outside of the bearing tub. It has been.

  The hydraulic machine according to the embodiment includes a runner, a main shaft connected to the runner, and the main shaft bearing device described above.

  According to the present invention, the frequency of lubricating water supply can be effectively reduced at low cost.

FIG. 1 is a cross-sectional view showing the overall configuration of the Francis turbine according to the present embodiment. FIG. 2 is a sectional view showing the spindle bearing device of FIG. FIG. 3 is a cross-sectional view showing a general spindle bearing device.

  Hereinafter, a spindle bearing device and a hydraulic machine in an embodiment of the present invention will be described with reference to the drawings.

  The main shaft bearing device and the hydraulic machine in the present embodiment will be described with reference to FIGS. 1 and 2. Here, first, a Francis turbine as an example of a hydraulic machine will be described with reference to FIG. As used in this specification, the shape and geometric conditions and the degree thereof are specified, for example, terms such as “horizontal”, “same”, “constant”, etc. are not bound to a strict meaning, The range to which similar functions can be expected is included.

  As shown in FIG. 1, the Francis turbine 1 includes a spiral casing 2 into which a water flow flows from an upper pond through a hydraulic pipe (both not shown), and a plurality of casings 2 provided on the inner peripheral side of the casing 2. A stay vane 3, a plurality of guide vanes 4 provided on the inner peripheral side of the stay vane 3, and a runner 5 provided on the inner peripheral side of the guide vane 4 are provided. Of these, the stay vane 3 guides the water flow flowing from the casing 2 to the guide vane 4, and the guide vane 4 guides the water flow from the stay vane 3 to the runner 5. Further, the guide vane 4 is configured to be able to adjust the flow rate of water, and the power generation output of the generator 7 described later can be adjusted by changing the flow rate of the water flow to the runner 5.

  As shown in FIG. 1, the runner 5 is configured to be driven to rotate about the rotation axis X by the water flow from the guide vane 4. That is, the runner 5 includes a crown 5a connected to a main shaft 6 described later, a band 5b provided on the outer peripheral side of the crown 5a, a plurality of runner blades 5c provided between the crown 5a and the band 5b, have.

  A generator 7 is connected to the crown 5 a of the runner 5 through a main shaft 6. A suction pipe 8 is provided on the downstream side of the runner 5. The suction pipe 8 is connected to a lower pond (or a water discharge channel) (not shown) so that water obtained by rotationally driving the runner 5 is discharged to the lower pond.

  Next, the spindle bearing device according to the present embodiment will be described with reference to FIG. Here, the main shaft bearing device is for supporting the main shaft 6 connected to the runner 5. In the present embodiment, a water-lubricated bearing device using water as a lubricant will be described as an example of a main shaft bearing device.

  As shown in FIG. 2, the water-lubricated bearing device 10 includes a bearing tub 11 (bearing tub) provided around the main shaft 6, and a bearing pad 20 provided in the bearing tub 11 and receiving a radial load of the main shaft 6. And. Among these, the bearing tank 11 stores lubricating water (W shown in FIG. 2) as a lubricant. At least a part of the bearing pad 20 described above is immersed in the stored lubricating water. In addition, additives such as preservatives may be added to the lubricating water.

  The bearing pad 20 is disposed on the outer peripheral side of the main shaft 6. More specifically, the main shaft skirt 21 is attached to the outer peripheral surface of the main shaft 6, and the bearing pad 20 is disposed on the outer peripheral side of the main shaft skirt 21. The bearing pad 20 faces the main shaft skirt 21 with a predetermined gap G therebetween. The bearing pad 20 may be formed in a cylindrical shape, but may be formed in a segment shape. The segment shape means a state in which the bearing pad 20 is composed of a plurality of bearing pads (not shown) arranged in the circumferential direction.

  The lubricating water is interposed in the gap G between the bearing pad 20 and the main shaft skirt 21, and serves as a lubricant between the bearing pad 20 and the main shaft skirt 21. For this reason, it is preferable that the bearing pad 20 is entirely immersed in the lubricating water, but if the bearing pad 20 can receive the radial load of the main shaft 6 and there is no problem with wear or the like, the entire bearing pad 20 is It is not limited to being immersed in lubricating water. That is, the lubricating water present in the gap G between the bearing pad 20 and the main shaft skirt 21 is ejected upward from the gap G by the rotation of the main shaft 6. Accordingly, the lubricating water below the gap G is pulled up to the gap G. For this reason, if not a whole of the bearing pad 20 but a part thereof is immersed in the lubricating water, the lubricating water can be interposed between the bearing pad 20 and the main spindle skirt 21 when the main shaft 6 rotates.

  A bearing support base 22 is provided on the outer peripheral side of the bearing pad 20. An adjustment portion 23 for adjusting the radial position of the bearing pad 20 is attached to the bearing support base 22. More specifically, the adjusting part 23 has an adjusting bolt 23a and an adjusting nut 23b, and the adjusting bolt 23a is inserted into the bearing support base 22 from the outer peripheral side and screwed together. The inner peripheral side end of the adjustment bolt 23 a is in contact with the outer peripheral surface of the bearing pad 20. By adjusting the screwing amount of the adjusting bolt 23a, the radial position of the bearing pad 20 is adjusted, and the gap G between the bearing pad 20 and the main shaft skirt 21 can be adjusted. An adjustment nut 23b is screwed onto the adjustment bolt 23a, and the adjustment bolt 23a is stopped at a desired position. A support plate 24 extends from the lower part of the bearing support base 22 to the inner peripheral side, and supports the bearing pad 20 from below so as to be movable in the radial direction. The bearing support 22 is connected to the tank body 12 of the bearing tank 11 via a connecting member 25 and supported by the tank body 12.

  The bearing tank 11 includes a tank body 12 having an opening 12 a provided in the upper part, a bearing cover 13 that covers the opening 12 a of the tank body 12, and a tank connector 14 that connects the tank body 12 and the bearing cover 13. ,have. Among these, the tank main body 12 schematically includes a bottom plate portion 12b, an inner peripheral cylinder portion 12c extending upward from the bottom plate portion 12b, and an outer peripheral cylinder portion 12d extending upward from the bottom plate portion 12b. . The inner peripheral cylinder part 12c and the outer peripheral cylinder part 12d are formed concentrically with the main shaft 6, and the outer peripheral cylinder part 12d is arranged on the outer peripheral side from the inner peripheral cylinder part 12c. A part of the inner peripheral side cylinder portion 12 c is disposed between the main shaft 6 and the main shaft skirt 21. Lubricating water is stored in the tank body 12 of the bearing tank 11 formed in this way.

  The tank connector 14 is attached to the upper part of the tank body 12 by a fastening portion 15 such as a bolt. A bearing cover 13 is attached to the upper portion of the tank coupling body 14 by another fastening portion 15. In the form shown in FIG. 2, the tank connector 14 is formed in an L shape in a cross section including the rotation axis X. More specifically, the tank connection body 14 includes a connection horizontal part 14a attached to the upper part of the outer peripheral side cylinder part 12d of the tank body 12, and a connection cylinder part 14b to which the bearing cover 13 is attached. . Among these, the connection horizontal part 14a is extended in the horizontal direction from the outer peripheral side cylinder part 12d of the tank main body 12 to the inner peripheral side. The connecting cylinder part 14b is formed concentrically with the main shaft 6 and is arranged on the inner peripheral side of the outer peripheral side cylinder part 12d of the tank body 12 when viewed from above. That is, the diameter of the connection cylinder part 14b is smaller than the diameter of the outer peripheral side cylinder part 12d.

  The tank connector 14 is provided with a wiring outlet 26 (not shown). One end of the wiring is connected to a temperature sensor (not shown) provided on the bearing pad 20, and the other end is connected to a control device (not shown). The temperature information measured by the temperature sensor is transmitted to the control device via this wiring, and the temperature is monitored or used for device control.

  A tank gap 27 is provided between the main shaft 6 and the bearing cover 13 of the bearing tank 11 (upper part of the bearing tank 11). The tank gap 27 communicates the internal space of the bearing tank 11 with the outside of the bearing tank 11. Note that a brush seal (not shown) may be provided in the tank gap 27 in order to prevent the sprayed water particles in the bearing tank 11 from flowing out through the tank gap 27.

  By the way, in the form shown in FIG. 2, a plurality of cooling pipes 28 are provided in the tank body 12 of the bearing tank 11. A cooling medium flows through the cooling pipe 28, and the lubricating water stored in the bearing tank 11 is cooled. The cooled lubricating water cools the bearing pad 20. In this way, the bearing pad 20 is cooled, and the lubricating water serves as a heat transfer medium between the cooling pipe 28 and the bearing pad 20. Such a cooling pipe 28 may not be provided in the tank body 12.

  As shown in FIG. 2, a partition plate 30 (partition member) extending in the vertical direction is provided in the bearing tank 11. The partition plate 30 communicates a gas phase space 31 above the lubricating water stored in the bearing tub 11 with an external communication space 32 that communicates with the outside of the bearing tub 11 and a gas communication with the outside of the bearing tub 11. It is partitioned into a non-communication space 33. That is, the gas phase space 31 formed above the lubricating water in the internal space of the bearing tub 11 is formed on the outer peripheral side from the partition plate 30 and the external communication space 32 formed on the inner peripheral side from the partition plate 30. The non-communication space 33 is partitioned. Among these, the external communication space 32 is in gas communication with the outside of the bearing tank 11 through the tank gap 27 described above.

  In the present embodiment, the partition plate 30 extends downward from the tank coupling body 14 of the bearing tank 11. More specifically, the partition plate 30 is formed so that the connection cylinder part 14b is extended below, and the diameter of the partition plate 30 is the same as the diameter of the connection cylinder part 14b. And the partition plate 30, the connection cylinder part 14b of the tank coupling body 14, and the connection horizontal part 14a are integrally formed, and the tank coupling body 14 and the partition plate 30 are formed in T shape as a whole. Has been.

  The height position of the lower end 30a of the partition plate 30 is preferably disposed below the lowest water surface (lower limit water surface) of the lubricating water. The amount of lubricating water is monitored by a liquid level sensor or the like (not shown), and when the lubricating water level drops and reaches the lowest level, water is supplied into the bearing tub 11. The minimum water surface is arbitrarily set according to various conditions. It is preferable to provide the partition plate 30 so that the lower end 30a is disposed below the set minimum water surface. Thereby, even when the water surface of the lubricating water reaches the lowest water surface, at least the lower end 30a of the partition plate 30 can be immersed in the lubricating water, and the gas phase space 31 can be partitioned effectively. The height position of the lower end 30a of the partition plate 30 may be arranged below the height position of the upper end 20a of the bearing pad 20 regardless of the lowest water surface. Thus, when the lowest water surface is set above the upper end 20a of the bearing pad 20 or above the upper end 20a, the lower end 30a of the partition plate 30 can be more reliably immersed in the lubricating water, and the gas phase space 31 Can be partitioned effectively.

  In the form shown in FIG. 2, the lower end 30 a of the partition plate 30 is disposed above the upper end of the bearing support base 22. Thus, the connection member 25 that connects the tank body 12 of the bearing tank 11 and the bearing support 22 and the partition plate 30 are prevented from interfering with each other.

  As shown in FIG. 2, the partition plate 30 may be provided with a pressure adjustment hole 34 for adjusting a pressure difference between the external communication space 32 and the non-communication space 33. The pressure adjusting hole 34 passes through the partition plate 30 and communicates the external communication space 32 and the non-communication space 33 in gas communication. However, the size of the pressure adjustment hole 34 does not affect the function of the partition plate 30 that partitions the external communication space 32 and the non-communication space 33, for example, the evaporation amount of lubricating water by the partition plate 30. It is preferable that the size is such that a sufficient reduction effect can be obtained.

  Next, the operation of the present embodiment having such a configuration will be described.

  During operation of the Francis turbine 1, the main shaft 6 that connects the runner 5 and the generator 7 rotates.

  Due to the rotation of the main shaft 6, the lubricating water present in the gap G between the bearing pad 20 and the main shaft skirt 21 is ejected upward from the gap G. The jetted lubricating water collides with the surface of the lubricating water and is jetted upward as a water flow, or mist-like water droplets are generated by the impact at the time of the collision. The generated sprayed water droplets are scattered in the external communication space 32. Lubricating water can evaporate from the surface of the sprayed water droplets scattered in the external communication space 32. Further, the lubricating water can evaporate from the surface of the lubricating water stored in the bearing tank 11 to the external communication space 32 and the non-communication space 33.

  The air in the external communication space 32 of the bearing tank 11 flows out of the bearing tank 11 through the tank gap 27 between the main shaft 6 and the bearing cover 13 together with the lubricating water vapor. For this reason, in the external communication space 32, the lubricating water can continuously evaporate from the surface of the sprayed water particles and the surface of the lubricating water.

  However, since the external communication space 32 is partitioned from the non-communication space 33 by the partition plate 30, the volume of the external communication space 32 is smaller than the volume of the entire gas phase space 31 of the bearing tank 11. . As a result, the volume filled with the spray water droplets is reduced, and evaporation of the lubricating water from the surface of the spray water particles can be suppressed.

  Further, the partition plate 30 extends in the vertical direction and the lower end 30a of the partition plate 30 is immersed in the lubricating water, so that the surface area of the surface of the lubricating water stored in the bearing tub 11 that contacts the external communication space 32 is increased. Can be reduced. Thereby, evaporation of the lubricating water from the surface of the lubricating water can be suppressed.

  On the other hand, the non-communication space 33 of the bearing tub 11 is partitioned from the external communication space 32 that is in gas communication with the outside of the bearing tub 11. Thus, the non-communication space 33 is prevented from communicating with the outside of the bearing tub 11, and the air in the non-communication space 33 is prevented from flowing out of the bearing tub 11. For this reason, evaporation of the lubricating water from the surface of the lubricating water to the non-communication space 33 is suppressed.

  In this manner, the evaporation amount of the lubricating water stored in the bearing tank 11 is reduced, and the decrease in the lubricating water can be suppressed. For this reason, the period until the water surface of the lubricating water reaches the minimum water surface can be lengthened, and the frequency of supplying the lubricating water can be effectively reduced. In addition, the structure for reducing the evaporation amount of lubricating water is achieved by the partition plate 30, and this partition plate 30 is not configured to cover the surface of the lubricating water. This can prevent the fluctuation of the water surface of the lubricating water during operation from being hindered.

  By the way, since the non-communication space 33 is partitioned from the external communication space 32 that is in gas communication with the outside of the bearing tank 11, it is preferable to increase the volume of the non-communication space 33 and reduce the volume of the external communication space 32. . Thereby, in the external communication space 32, it is possible to further reduce the evaporation amount of the lubricating water that can evaporate from the surface of the sprayed water particles and the surface of the lubricating water. For this reason, it may be preferable to bring the partition plate 30 closer to the main shaft skirt 21. However, as the partition plate 30 approaches the main shaft skirt 21, the lubricating water flow ejected from the gap G between the bearing pad 20 and the main shaft skirt 21 easily collides with the partition plate 30. In this case, there is a possibility that the sprayed water droplets of the lubricating water increase and increase the evaporation amount. Further, the partition plate 30 may be damaged by the collision of the lubricating water flow. For this reason, it is preferable that the partition plate 30 is disposed at a position where collision with such a flow of lubricating water can be avoided. For example, depending on various conditions such as the rotational speed of the main shaft 6, the partition plate 30 is arranged on the outer peripheral side of the bearing pad 20 when viewed from above if collision with the water flow of the lubricating water can be avoided. Alternatively, as shown in FIG. 2, the bearing support 22 may be arranged on the outer peripheral side.

  As described above, according to the present embodiment, the gas phase space 31 above the lubricating water stored in the bearing tub 11 is in communication with the external communication space 32 that communicates with the outside of the bearing tub 11 and the outside of the bearing tub 11. It is partitioned by a partition plate 30 into a non-communication space 33 that is not in gas communication. Thereby, the volume of the external communication space 32 can be reduced, and the evaporation amount of the lubricating water evaporated in the external communication space 32 can be reduced. On the other hand, since the non-communication space 33 is not in gas communication with the outside of the bearing tank 11, the evaporation amount of the lubricating water that evaporates in the non-communication space 33 can be reduced. For this reason, the evaporation amount of the lubricating water stored in the bearing tank 11 can be reduced, and the period until the lubricating water surface reaches the minimum water surface can be lengthened. Moreover, the structure for reducing the evaporation amount of the lubricating water can be achieved by the partition plate 30, and it is possible to suppress the structure from being complicated and to reduce the cost. As a result, the lubrication water supply frequency can be effectively reduced at low cost. In other words, it is possible to prevent the water-lubricated bearing device 10 capable of reducing the evaporation amount of the lubricating water from being increased in size and to prevent the space occupied by the water-lubricated bearing device 10 from increasing.

  Moreover, according to this Embodiment, the partition plate 30 is extended in the up-down direction. As a result, the area of the surface of the lubricating water stored in the bearing tub 11 that contacts the external communication space 32 can be reduced. Thereby, evaporation of the lubricating water from the surface of the lubricating water can be suppressed, and the evaporation amount of the lubricating water can be further reduced.

  Further, according to the present embodiment, the partition plate 30 extends downward from the tank connecting body 14 that connects the tank body 12 of the bearing tank 11 and the bearing cover 13. Thus, even if another structure is present above the water-lubricated bearing device 10, the partition plate 30 can be easily assembled in the bearing tub 11.

  Furthermore, according to the present embodiment, the partition plate 30 is provided with the pressure adjusting hole 34 for adjusting the pressure difference between the external communication space 32 and the non-communication space 33. As a result, when a pressure difference occurs between the external communication space 32 and the non-communication space 33, air can flow from the higher pressure to the lower pressure through the pressure adjustment hole 34. For this reason, the pressure in the external communication space 32 and the pressure in the non-communication space 33 are equalized, and the height of the surface of the lubricating water in contact with the external communication space 32 and the height of the surface of the lubricating water in contact with the non-communication space 33 are increased. The position can be the same.

  In addition, in this Embodiment mentioned above, the tank main body 12 and the bearing cover 13 of the bearing tank 11 were demonstrated with the tank coupling body 14 connected. However, it is not restricted to this, The structure of the bearing tank 11 can be made arbitrary. For example, the bearing cover 13 may be attached to the upper part of the tank body 12 without using the tank connector 14. In this case, the partition plate 30 can have any configuration or shape as long as it can divide the gas phase space 31 into the external communication space 32 and the non-communication space 33. You may form so that it may extend.

  Moreover, in this Embodiment mentioned above, the example using water as a lubricant was demonstrated. However, the present invention is not limited to this, and other fluids such as oil may be used as the lubricant.

  Furthermore, in the above-described embodiment, the Francis turbine has been described as an example of the hydraulic machine. However, the present invention is not limited to this, and the main shaft bearing device and the hydraulic power according to the present invention can be applied to a hydraulic machine other than the Francis turbine. Machine can be applied. For example, the present invention can be suitably applied to a vertical axis turbine such as a Kaplan turbine.

  According to the embodiment described above, it is possible to effectively reduce the replenishment frequency of the lubricating water at a low cost.

  Although the embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

1: Francis turbine, 6: main shaft, 10: water-lubricated bearing device, 11: bearing tank, 12: tank body, 12a: opening, 13: bearing cover, 14: tank connector, 20: bearing pad, 20a: upper end , 22: bearing support, 30: partition plate, 30a: lower end, 31: gas phase space, 32: external communication space, 33: non-communication space, 34: pressure adjusting hole, W: lubricating water

Claims (7)

A spindle bearing device for supporting a spindle connected to a runner of a hydraulic machine,
A bearing tub provided around the main shaft and storing a lubricant;
A bearing pad provided in the bearing tub and at least partially immersed in the lubricant stored in the bearing tub to receive a radial load of the main shaft;
A tank gap that communicates gas phase space above the lubricant stored in the bearing tank with the outside of the bearing tank; and
It includes specification Setsu and member,
The bearing tank has a tank body that stores the lubricant, and a tank body cover member that covers the tank body,
The partition member is connected to the tank body cover member,
The gas phase space is formed on the inner peripheral side with respect to the partition member, and is formed on the outer peripheral side with respect to the outer space than the partition member, and the external communication space that communicates with gas outside the bearing tank through the tank gap. The spindle bearing device is partitioned into a non-communication space that does not have the tank gap .   The spindle bearing device according to claim 1, wherein the partition member extends in a vertical direction. The tank body cover member includes a bearing cover that covers an opening provided in an upper portion of the tank body, and a tank coupling body that connects the tank body and the bearing cover.
The main shaft bearing device according to claim 1, wherein the partition member extends downward from the tank coupling body.   4. The spindle bearing device according to claim 1, wherein a height position of a lower end of the partition member is disposed below a height position of an upper end of the bearing pad. 5. A bearing support provided on an outer peripheral side of the bearing pad, to which an adjustment member for adjusting a radial position of the bearing pad is attached;
The spindle bearing device according to any one of claims 1 to 4, wherein the partition member is disposed on an outer peripheral side from the bearing support when viewed from above.   The pressure adjusting hole for adjusting the pressure difference between the external communication space and the non-communication space is provided in the partition member. Main shaft bearing device. The runner;
The main shaft coupled to the runner;
A hydraulic machine comprising: the spindle bearing device according to any one of claims 1 to 6.

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