JP2003120675A - Bearing device and method for controlling lubricant supply in bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bearing device capable of preventing rise of temperature of a tilting pad and seizure accompanied therewith, and realizing reduction of oil amount. SOLUTION: A nozzle 17 for directly supplying cooling lubricating oil o2 to a cooled portion 16a positioned in a back surface 16 side corresponding to a lubricating oil flow direction downstream side portion 15a in a bearing surface 15 of each tilting pad 13 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device for supporting a rotary shaft of a large rotating machine such as a steam turbine or a generator,
The present invention relates to a lubricating oil supply amount control method for adjusting the lubricating oil supply amount to this bearing device.

[0002]

2. Description of the Related Art An example of a conventional bearing device of this type is shown in FIGS. In the figure, the main shaft 1 is supported by a plurality of pads 2, ... And each pad 2 ,. It is supported. As a result, the pads 2, ... Incline according to the rotation of the main shaft 1, and the main shaft 1 is supported by the wedge action of the oil film. Refueling is introduced from the refueling hole 6, passes through the inside of the outer support ring 5, and is jetted from the nozzles 7, ... Lubricated.

[0003]

As described above, the inside of the bearing is not filled with oil, and the main spindle 1 and the pads 2, which rotate, are rotated.
The bearing of the type that supplies the lubricating oil only to the sliding portions is generally called a direct lubrication type bearing. In this direct lubrication type bearing, the bearing is not filled with oil, so that the amount of oil supplied from each nozzle 7, ... becomes small due to a decrease in pump oil pressure, or at the initial design stage. When it is desired to reduce the amount of bearing oil to reduce the tank capacity, it is necessary to reduce the amount of oil supplied from each nozzle 7 ,.
In such a case, oil does not spread over the entire sliding surface between each pad 2, ... And the main shaft 1, and the vicinity of the wake of each pad 2 ,. , Around the most downstream end of the lubricating oil in the flow direction), a situation occurs where the oil shear heat is locally generated, the temperature of the oil film rises and each pad 2 ,.
・ In some cases, the temperature rise of ∙ increased locally, causing problems such as bearing burnout. In addition, each nozzle 7, ...
When the lubrication area on the sliding surface of each pad 2, ... changes due to a change in the amount of oil supplied from the pad 2, ..., the amount of inclination of each pad 2, ... also changes according to its area, In some cases, stable vibration was generated.

The present invention has been made in view of the above circumstances, and is capable of preventing the temperature rise of the tilting pad and the occurrence of seizure, and at the same time, it is possible to achieve a low oil amount. The purpose is to provide a device.

[0005]

The present invention adopts the following means in order to solve the above problems. That is, the bearing device according to claim 1 supports the rotating shaft through a plurality of tilting pads that are divided in the circumferential direction and are swingably supported in the bearing housing. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to a clearance flow path between the tilting pads, the bearing surface of each of the tilting pads is located on the back surface side corresponding to the downstream side portion in the lubricating oil flow direction. It is characterized by comprising a lubricating oil supply portion for cooling, which supplies lubricating oil directly to the portion to be cooled. According to the bearing device of claim 1, each tilting pad is
The temperature tends to rise especially in the downstream portion of the bearing surface in the lubricating oil flow direction, but the temperature-adjusted lubricating oil is fed to the cooled portion corresponding to the high temperature portion on the rear surface side for cooling. By supplying more concentratedly, each tilting pad can be effectively cooled with a small amount of lubricating oil.

According to a second aspect of the present invention, there is provided the bearing device according to the first aspect, wherein each of the cooling lubricating oil supply portions is located at a central position in a width direction of each of the tilting pads in the cooled portion. It is characterized in that the lubricating oil is supplied in a concentrated manner. According to the bearing device of the second aspect, when looking at the temperature distribution in the width direction on the bearing surface, the center position in the width direction is likely to become particularly high in temperature.
The temperature tends to be highest at the downstream side portion in the lubricating oil flow direction and in the widthwise central position. Therefore, by supplying the temperature-adjusted lubricating oil to the part on the back side corresponding to the part that easily heats up in a pinpoint manner, it is more effective than when supplying it to the part deviating from this part. Therefore, each tilting pad can be cooled.

According to a third aspect of the present invention, in the bearing device according to the first or second aspect, at least the portion including the cooled portion on the back surface side of each of the tilting pads has a finned shape. It is characterized as being. According to the bearing device of the third aspect, since the contact area (heat transfer area) between each tilting pad and the lubricating oil increases due to the finned shape, the same amount of lubricating oil is used. Even then, the tilting pad can be cooled more effectively.

According to a fourth aspect of the present invention, the bearing device supports the rotary shaft through a plurality of tilting pads which are divided in the circumferential direction and are swingably supported in the bearing housing. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to the clearance passage between the tilting pads, one end side is exposed to the lubricating oil passage facing the back side of the bearing surface of each of the tilting pads. The heat pipe is disposed at the other end side and is disposed in the vicinity of the bearing surface on the downstream side of each of the tilting pads in the flow direction of the lubricating oil flowing along the bearing surface. According to the bearing device of the fourth aspect, the fluid in each heat pipe flows to the one end side after being heated by cooling the high temperature portion of the tilting pad at the other end side. . Then, the fluid that has reached this one end side radiates heat to the lubricating oil that flows through the lubricating oil flow path that faces the back surface side of the bearing surface, thereby cooling itself and returning to the other end side again. In this way, the fluid inside the heat pipe bridged between the high temperature part (downstream side in the lubricating oil flow direction on the bearing surface of the tilting pad) and the low temperature part (lubricant oil flow path on the back side of the tilting pad) is used. The high temperature part is intensively cooled from the inside by circulating the.

According to a fifth aspect of the present invention, the bearing device supports the rotary shaft via a plurality of tilting pads which are divided in the circumferential direction and are swingably supported in the bearing housing. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to a gap flow path between tilting pads, one end side is arranged in the lubricating oil flow path, and the other end side is each tilting pad. Is equipped with a heat pipe arranged inside. According to the bearing device of the fifth aspect, the fluid in each heat pipe flows to the one end side after being heated by cooling the high temperature portion of the tilting pad at the other end side. . The fluid reaching the one end side radiates heat to the lubricating oil supplied from the lubricating oil direct supply pipe to cool itself, and then returns to the other end side again. In this way, the heat from the high temperature part (near the bearing surface of the tilting pad) is released to the lubricating oil supplied directly from the lubricating oil direct supply pipe, so that the high temperature part is intensively cooled from the inside. You can

According to a sixth aspect of the present invention, there is provided a bearing device in which a rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and are swingably supported in a bearing housing. In a bearing device having a lubricating oil direct supply pipe for directly supplying lubricating oil to the clearance passage between the tilting pads, each of the tilting pads,
A temperature sensor for detecting the temperature of each of the tilting pads is provided, and a flow rate adjusting mechanism for adjusting the amount of lubricating oil supplied to each of the lubricating oil direct supply pipes is connected to each of the lubricating oil direct supply pipes. Characterize. According to the bearing device of the sixth aspect, the temperature of each tilting pad is detected by the temperature sensor, and the flow rate adjusting mechanism is operated according to the temperature measurement result. The pad allows more lubricating oil to be distributed.

According to a seventh aspect of the present invention, in the bearing device according to the sixth aspect, automatic control is performed to adjust the flow rate of each of the lubricating oil direct supply pipes based on the detection result from each of the temperature sensors. It is characterized in that a mechanism is provided. According to the bearing device of the above claim 7, the automatic control mechanism automatically adjusts the flow rate of the lubricating oil for each tilting pad without requiring human labor, so that the bearing device has high accuracy and high responsiveness. The flow rate can be controlled appropriately.

According to a eighth aspect of the present invention, there is provided a method for controlling a lubricating oil supply amount of a bearing device, wherein a rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and swingably supported in a bearing housing. However, in the method for controlling the lubricating oil supply amount of the bearing device that directly supplies the lubricating oil to the clearance passage between the rotary shaft and each of the tilting pads, the temperature of each of the tilting pads is individually measured, and the result of the measurement Based on the above, the supply amount of the lubricating oil is adjusted for each of the tilting pads. According to the lubricating oil supply amount control method for a bearing device of the eighth aspect, by detecting the temperature of each tilting pad and adjusting the lubricating oil supply amount according to the temperature measurement result, More lubricating oil can be supplied to the high temperature tilting pad.

According to a ninth aspect of the present invention, there is provided a method for controlling a lubricating oil supply amount of a bearing device, wherein in the method for controlling a lubricating oil supply amount of a bearing device according to the eighth aspect, the adjustment of the lubricating oil supply amount is performed by the measurement. It is characterized in that it is performed by an automatic control mechanism that automatically controls based on the result. According to the lubricating oil supply amount control method for a bearing device of the above claim 9, since the automatic control mechanism automatically adjusts the flow rate of the lubricating oil for each tilting pad without requiring human labor, high precision is achieved. In addition, the flow rate can be appropriately controlled with high responsiveness.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The respective embodiments of the bearing device of the present invention will be described below with reference to FIGS. 1 to 7, but it goes without saying that the present invention is not limited to these. Is. In each of the embodiments, the description will be made focusing on the differences from the bearing device described in the related art with reference to FIGS. 8 and 9, and the description of other parts will be omitted because they are similar. First, the first embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 is a diagram showing a main part of the bearing device of the present embodiment, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the main shaft. Further, FIG. 2 is a view showing the bearing device and is an enlarged view of a portion B in FIG. 1. Further, FIG. 3 is a perspective view of a main part showing a modified example of the bearing device.

As shown in FIG. 1, the bearing device of the present embodiment is divided into a plurality of parts which are divided in the circumferential direction and are pivotally supported by a pivot 12 in an internal support ring 11a in a bearing housing (not shown). The rotary shafts 14 are supported via the individual (four in this example) tilting pads 13, and lubricating oil o1 (lubricant oil) for lubrication is applied to the clearance flow passages f between the rotary shafts 14 and the respective tilting pads 13. It has a configuration including a plurality of lubricating oil direct supply pipes (the same as each nozzle 7 described in FIG. 8 in the related art, not shown) for direct supply. It should be noted that FIG. 1 shows one of the four sets of tilting pad 13 and pivot 12. In the figure, reference numeral CL indicates the axis of the rotary shaft 14, and the rotary shaft 14 is drawn in the direction of arrow R centering on the axis CL.
Is designed to rotate.

Further, in the bearing device of the present embodiment, as shown in FIG. 2, the bearing surface 15 of each tilting pad 13 is positioned on the back surface 16 side substantially corresponding to the downstream side portion 15a in the lubricating oil flow direction. A nozzle 17 (cooling lubricating oil supply section) for directly supplying the cooling lubricating oil o2 (lubricating oil) toward the cooled portion 16a is provided for each tilting pad 13.

Each tilting pad 13 has a rotary shaft 1.
When viewed in a line of sight parallel to the axis CL of 4, the arc shape is formed,
Moreover, it has a curved plate shape that is wide in the direction of the axis CL. The pressure distribution applied to the bearing surface 15 of the curved plate-shaped tilting pad 13 is from the upstream side to the downstream side of the clearance channel f when viewed from a line of sight parallel to the axis CL (that is, The pressure tends to gradually increase (from the inlet to the outlet of the clearance flow path f), and becomes maximum at the outlet-side downstream portion 15a in the lubricating oil flow direction.
Due to this pressure distribution, a temperature distribution as shown by each isothermal distribution line h in the figure is generated in each tilting pad 13. Therefore, in the figure, the metal temperature is maximized in the downstream portion 15a in the lubricating oil flow direction, and a temperature distribution is formed in which the temperature decreases as the distance from the metal temperature increases.

In addition, the pressure distribution applied to the bearing surface 15 of the tilting pad 13 is measured in the width direction (axis CL).
When viewed in a direction parallel to the direction), the pressure becomes highest at the center position in the width direction, and the pressure gradually decreases with increasing distance from both sides in a mountain shape. Due to this pressure distribution, a temperature distribution is formed in which the temperature is highest at the center position of the tilting pad 13 in the width direction and gradually lowers as the distance from the widthwise center is increased.

As described above, each tilting pad 13 tends to have the highest temperature at the downstream side portion 15a in the lubricating oil flow direction and at the center position in the width direction. Therefore, in the present embodiment, the nozzles 17 supply the cooling lubricating oil o2 intensively toward the widthwise central portion at the downstream side portion 15a in the lubricating oil flow direction, so that the high temperature cooled portion can be removed. Therefore, even a small amount of lubricating oil can be effectively cooled.

The operation of the bearing device of the present embodiment having the above-described structure will be described. As shown in FIG. 2, the lubricating oil discharged from the respective lubricating oil direct supply pipes toward the peripheral surface of the rotary shaft 14 is used. The lubricating oil o1 is entrained by the rotation of the rotating shaft 14 and guided into the clearance channel f, and flows from the inlet to the outlet. The clearance channel f at this time
Is filled with the lubricating oil o1 for lubrication, but the bearing surface 15 of each tilting pad 13 is substantially fixed, while the rotating shaft 14 side rotates at an extremely high peripheral speed, so that The rotating shaft 14 is included in the filled lubricating oil o1.
A very large speed difference occurs between the tilting pad 13 side and each tilting pad 13 side. When such a speed difference occurs, a shearing force acts on the lubricating oil for lubrication o1 and a viscous force is generated inside the lubricating oil for lubrication o1. Due to this viscous action and the tilt formed by the movement of the rotating shaft 14 and the tilting pads 13, a wedge effect is generated, and an oil film pressure is generated in the lubricating oil o1 in the clearance passage f to rotate. The shaft 14 is supported. The pressure distribution of this oil film pressure and the temperature distribution formed along with this pressure distribution are as described above. At this time, the lubricating oil o1 for lubrication serves to lubricate the rotating shaft 14 and the respective tilting pads 13 and also serves to cool the respective tilting pads 13.

On the other hand, the cooling lubricating oil o2 discharged from each nozzle 17 is the back surface 16 of each tilting pad 13.
The cooled portion 16a located on the side is intensively cooled. As a result, in the tilting pad 13, the temperature is particularly high, the downstream side portion 15a in the lubricating oil flow direction and the widthwise center position are effectively cooled from the back surface 16 side.
In this way, the lubricating oil o1 for cooling and the lubricating oil o2 for cooling after finishing the work flow out in the direction of the axis CL of the rotating shaft 14 and are collected.

As described above, in the bearing device of this embodiment, the bearing surface 15 of each tilting pad 13 faces the portion to be cooled which is located on the back surface 16 side corresponding to the downstream side portion 15a in the lubricating oil flow direction. Then, a configuration including each nozzle 17 for directly supplying the lubricating oil for cooling is adopted. According to this configuration, as described above, in each tilting pad 13, the downstream side portion 15a of the bearing surface 15 in the lubricating oil flow direction tends to become particularly hot, but the back surface 16 side corresponding to this hot portion By intensively supplying the temperature-controlled cooling lubricating oil o2 from the respective nozzles 17 toward the portion to be cooled, it is possible to effectively cool the respective tilting pads 13 even with a small amount of lubricating oil. become able to. Therefore, it is possible to prevent the temperature rise of each tilting pad 13 and the occurrence of seizure accompanying it, and it is also possible to achieve a low oil amount.

Further, in the bearing device of the present embodiment, each nozzle 17 concentrates the cooling lubricating oil o2 toward the center position in the width direction of each tilting pad 13 in the cooled portion. Adopted. According to this configuration, since the lubricating oil o2 for cooling is concentratedly supplied toward the center position in the width direction where the temperature is likely to increase, it is possible to cool the tilting pads 13 more effectively.

Although the back surface 16 of each of the tilting pads 13 in this embodiment described above has a simple curved surface shape, the back surface 16 has a simple curved surface shape, for example, as shown in a modification of FIG. Alternatively, a finned shape in which a large number of fins 16b are formed along the circumferential direction may be used. In this case, the heat transfer area (heat dissipation area) on the back surface 16 side of each tilting pad 13 is formed by the finned shape.
Therefore, the tilting pad 13 can be cooled more effectively even with the same amount of cooling lubricating oil. In addition, the gap between the fins 16b guides and regulates the flow of the lubricating oil for cooling o2, so that it is possible to obtain the effect that stirring loss hardly occurs. In addition,
In the example shown in the figure, the fin 16 is formed over the entire back surface 16, but a high heat transfer effect can be obtained even if only the peripheral portion including the cooled portion is formed in the fin.

Next, referring to FIG. 4, the second embodiment of the present invention will be described.
The embodiment will be described below. Here, FIG.
FIG. 4 is a view showing the bearing device of the present embodiment, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotary shaft.

As shown in the figure, the bearing device of the present embodiment is divided into a plurality of parts which are divided in the circumferential direction and are swingably supported by a pivot 22 in an inner support ring 21a in a bearing housing (not shown). The rotating shafts 24 are supported via the individual (four in this example) tilting pads 23, and lubricating oil o1 (lubricating oil) for lubrication is applied to the clearance flow paths f1 between the rotating shafts 24 and the respective tilting pads 23. It has a configuration including a plurality of lubricating oil direct supply pipes (the same as each nozzle 7 described in FIG. 8 in the related art, not shown) for direct supply. It should be noted that the figure shows one of the four sets of tilting pad 23 and pivot 22. In the figure, the rotary shaft 24 rotates in the direction of arrow R.

Each tilting pad 23 of the bearing device of this embodiment has a built-in heat pipe 27 for effectively cooling the tilting pad 23. These heat pipes 27 have one end 27
The a side is exposed and arranged in the lubricating oil flow path f2 facing the back surface 26 side of the bearing surface 25 of each tilting pad 23, and the other end 27b side is the bearing surface 2 of each tilting pad 23.
5 is arranged near the bearing surface on the downstream side in the flow direction of the lubricating oil for lubrication o1 (however, the other end 27b is
It is not exposed on the bearing surface 25 and is built in at a predetermined depth from the bearing surface 25). In addition, as shown in the figure, a plurality of these heat pipes 27 (three in this example) are arranged in the circumferential direction around the rotation shaft 24, and the width direction of each tilting pad 23 (that is, the rotation shaft 24). A plurality of lines are arranged in the axial direction.

As described in the first embodiment, the pressure distribution applied to the bearing surface 25 of each of the tilting pads 23 is parallel to the axis of the rotary shaft 24, like the tilting pads 23. When viewed from a different line of sight, the pressure tends to gradually increase from the upstream side to the downstream side of the gap flow channel f1 (that is, from the inlet to the outlet of the gap flow channel f1), which is the outlet. It becomes maximum in the downstream side portion 25a in the lubricating oil flow direction. Due to this pressure distribution, the metal temperature is maximized in the downstream portion 25a in the lubricating oil flow direction, and a temperature distribution is formed in which the temperature decreases as the distance from the metal temperature increases.

As described above, each tilting pad 23 tends to have the highest temperature at the downstream side portion 25a in the lubricating oil flow direction. Therefore, in the present embodiment, each heat pipe 27 can effectively cool this high temperature portion with a small amount of lubricating oil.

The operation of the bearing device of the present embodiment having the above-described structure will be described. As shown in FIG. 4, the lubricating oil discharged from each of the lubricating oil direct supply pipes toward the peripheral surface of the rotary shaft 24 is lubricated. The lubricating oil o1 is entrained by the rotation of the rotary shaft 24, guided into the clearance flow path f1, and flows from the inlet to the outlet. The clearance channel f at this time
1 is filled with the lubricating oil o1 for lubrication, but the bearing surface 25 of each tilting pad 23 is substantially fixed, while the rotating shaft 24 side rotates at an extremely high peripheral speed, the clearance flow path f The lubricating oil o1 filled with the
A very large speed difference occurs between the tilting pad 13 side and each tilting pad 13 side. When such a speed difference occurs, a shearing force acts on the lubricating oil for lubrication o1 and a viscous force is generated inside the lubricating oil for lubrication o1. Due to this viscous action and the tilt formed by the movement of the rotating shaft 24 and the tilting pads 13, a wedge effect is generated, and an oil film pressure is generated in the lubricating oil o1 in the clearance passage f to rotate. The shaft 24 is supported. The pressure distribution of this oil film pressure and the temperature distribution formed along with this pressure distribution are as described above. At this time, the lubricating oil o1 for lubrication serves to lubricate the rotating shaft 14 and the respective tilting pads 23, and also serves to cool the respective tilting pads 23.

On the other hand, each of the tilting pads 23 is cooled via each of the heat pipes 27 by the lubricating oil flowing through the lubricating passage f2. That is, since the fluid circulating between the one end 27a and the other end 27b is accommodated in each heat pipe 27 depending on the temperature condition thereof, a high temperature portion (the bearing surface 2 of the tilting pad 27).
5 on the downstream side 25a in the direction of the lubricating oil flow) and each heat pipe 27 in a state of being bridged between the low temperature portion (the lubricating oil flow path f2 on the back surface 26 side of the tilting pad 23).
By circulating the fluid inside, the high temperature portion is intensively cooled from the inside. As a result, since each tilting pad can be effectively cooled even with a small amount of lubricating oil, it is possible to prevent the temperature rise of each tilting pad 23 and the occurrence of seizure accompanying it, and at the same time, reduce the temperature. It is possible to achieve oil quantity.

Next, referring to FIG. 5, the third embodiment of the present invention will be described.
The embodiment will be described below. Here, FIG.
FIG. 4 is a view showing the bearing device of the present embodiment, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotary shaft.

As shown in the figure, the bearing device of the present embodiment is divided into a plurality of parts which are divided in the circumferential direction and are swingably supported by a pivot 32 in an inner support ring 31a in a bearing housing (not shown). A plurality of (four in this example) tilting pads 33 support the rotating shafts 34, and a plurality of lubricating oils o1 are directly supplied to the clearance flow paths f1 between the rotating shafts 34 and the respective tilting pads 33. Nozzle 39
(Lubricant oil direct supply pipe) is provided. In the figure, these four sets of tilting pads 33
And one of the pivots 32 is shown. In the figure, the rotary shaft 34 rotates in the direction of arrow R.

A heat pipe 37 for effectively cooling the tilting pads 33 is built in each of the tilting pads 33 of the bearing device of this embodiment. These heat pipes 37 have one end 37
The side a is the lubricating oil o1 discharged from the outlet of each nozzle 39.
, And the other end 37b side is arranged inside each tilting pad 37 (however, the other end 3).
7b is not exposed on the bearing surface 35,
From the built-in deeper than the predetermined depth). In addition, as shown in the figure, a plurality of these heat pipes 37 (six in this example) in the circumferential direction around the rotation shaft 34,
In addition, the width direction of each tilting pad 33 (that is,
Plural pieces are arranged in the axial direction of the rotary shaft 34).

The operation of the bearing device of the present embodiment having the above-described structure will be described. As shown in FIG. 5, the lubricating oil o1 discharged from each nozzle 39 toward the peripheral surface of the rotary shaft 34 rotates. It is entrained by the rotation of the shaft 34, guided into the clearance flow path f1, and flows from its inlet toward its outlet. At this time, the lubricating oil o1
A wedge effect is generated due to the viscous action generated inside the rotor and the inclination formed by the movement of the rotating shaft 34 and each tilting pad 33, and the lubricating oil o1 in the clearance flow path f1 is generated.
An oil film pressure is generated on the shaft to support the rotating shaft 34. In addition, the lubricating oil o1 at this time performs a lubricating action between the rotary shaft 34 and each of the tilting pads 33, and also serves to cool each of the tilting pads 33.

By the way, in each heat pipe 37, after the fluid is heated by cooling the high temperature part of the tilting pad 33 on the side of the other end 37b,
It flows toward the one end 37a side. And this one end 37a
The fluid reaching the side cools itself by radiating heat to the lubricating oil o1 supplied from each nozzle 39, and returns to the other end 37b side again. In this way, by letting the heat from the bearing surface 35 of the tilting pad 33 escape to the lubricating oil o1 supplied from each nozzle 39, the high temperature portion can be intensively cooled from the inside. become able to.

As described above, in the bearing device of this embodiment, the one end 37a side is arranged in the flow path of the lubricating oil o1,
The other end 37b side is provided with the heat pipe 37 arranged inside each tilting pad 33. According to this configuration, the heat from the high temperature portion (bearing surface 35 of the tilting pad 33) is released to the lubricating oil o1 supplied from each nozzle 39, whereby the high temperature portion is intensively cooled from the inside. be able to. This allows
Since each tilting pad 33 can be cooled effectively even with a small amount of lubricating oil, it is possible to prevent the temperature rise of each tilting pad 33 and the occurrence of seizure accompanying it, and to reduce the amount of oil. Will also be achievable.

Next, referring to FIG. 6, the fourth embodiment of the present invention will be described.
The embodiment will be described below. Here, FIG.
FIG. 4 is a view showing the bearing device of the present embodiment, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotary shaft.

As shown in the figure, the bearing device according to the present embodiment is divided into a plurality of pieces (in a plurality of pieces) which are divided in the circumferential direction and are swingably supported by the pivot 42 in the inner support ring 41a in the bearing housing 41. The rotating shaft 44 is supported via four tilting pads 43, and the gap flow path f1 between the rotating shaft 44 and each tilting pad 43 is provided.
Is provided with a plurality of nozzles 49 (lubricating oil direct supply piping) for directly supplying the lubricating oil o1. In the figure, the rotary shaft 44 rotates in the direction of arrow R.

In the bearing device of this embodiment, each of the tilting pads 43 has a built-in temperature sensor 55a for individually detecting the temperature of each of the tilting pads 43, and each of the nozzles 49 has these nozzles. Flow rate adjusting mechanism 50 for adjusting the amount of lubricating oil supplied for each 49a
Are connected.

Each temperature sensor 55a is a temperature display device 55.
b is connected to each tilting pad 43.
It is possible to display each metal temperature. The flow rate adjusting mechanism 50 distributes and supplies the oil supply o from an oil supply device (not shown) to the nozzles 49.
1 and a plurality of flow rate adjusting valves 52 connected on the pipe 51 and adjusting the distribution flow rate of the oil supply o to each nozzle 49. Each flow rate adjusting valve 52 is a manual valve, and the flow rate of the lubricating oil o1 can be finely adjusted for each nozzle 49 (that is, for each tilting pad 43) by manually adjusting the opening degree. Has become.

The operation of the bearing device of the present embodiment having the above-described structure will be described. As shown in FIG. 6, the lubricating oil o1 discharged from each nozzle 49 toward the peripheral surface of the rotary shaft 44 rotates. It is entrained by the rotation of the shaft 44 and guided into the clearance channel f1, and flows from its inlet toward its outlet. At this time, the lubricating oil o1
A wedge effect is generated due to the viscous action generated inside the rotor and the inclination formed by the movement of the rotating shaft 44 and each tilting pad 43, and the lubricating oil o1 in the clearance flow path f1 is generated.
An oil film pressure is generated on the shaft to support the rotating shaft 44. At this time, the lubricating oil o1 has a lubricating effect between the rotary shaft 44 and each of the tilting pads 43, and also has a cooling effect of each of the tilting pads 43.

Since the metal temperature of each tilting pad 43 at this time is displayed on the temperature display device 55b,
Based on this temperature measurement result, the operator determines that the tilting pad 4 whose metal temperature is relatively higher than the others.
When there is 3, the opening degree of the flow rate adjusting valve 52 connected to the nozzle 49 which supplies the lubricating oil o1 to the tilting pad 43 is manually opened to increase the flow rate.
As a result, the tilting pad 43 having a particularly high temperature is
Since more lubricating oil o1 can be circulated, it is possible to prevent a part of all the tilting pads 43 from having a locally high temperature, and to uniformly adjust the temperature of all the metals. Will be able to.

As described above, in the bearing device and the lubricating oil supply amount control method thereof according to the present embodiment, each tilting pad 43 is provided with the temperature sensor 55a for detecting the temperature of each tilting pad 43, and each tilting pad 43 is provided with the temperature sensor 55a. In the nozzle 49,
A configuration / method is employed in which a flow rate adjusting mechanism 50 for adjusting the amount of lubricating oil supplied to each nozzle 49 is connected and the flow rate is adjusted for each nozzle 49. According to this, the temperature of each tilting pad 43 is detected by the temperature sensor 55a, and the flow rate adjusting valve 52 of the flow rate adjusting mechanism 50 is operated according to the temperature measurement result, so that the temperature of the tilting pad 43 is particularly high. Since a large amount of lubricating oil o1 can be circulated to the touching pad 43, it becomes possible to cool more effectively even with the same total amount of lubricating oil supplied. Therefore, it is possible to prevent the temperature rise of each tilting pad 43 and the occurrence of seizure accompanying it,
At the same time, it is possible to achieve low oil consumption.

Next, referring to FIG. 7, the fifth embodiment of the present invention will be described.
The embodiment will be described below. Here, FIG.
FIG. 4 is a view showing the bearing device of the present embodiment, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotary shaft.

This embodiment corresponds to a modification of the above-described fourth embodiment, and in the following description, differences from the above-described fourth embodiment will be mainly described, and other same components The same reference numerals are given to those and description thereof will be omitted. As shown in FIG. 7, the bearing device according to the present embodiment uses each nozzle 4 based on the detection result from each temperature sensor 55a.
The difference is that an automatic control mechanism 60 for adjusting the flow rate for each 9 is provided. When the automatic control mechanism 60 takes in the temperature measurement result from the temperature display device 55b through the wiring 61 and confirms that the temperature is locally high among all the tilting pads 43,
Flow rate control valve 5 to increase the flow rate to lower this temperature
2 ′ is selected and its opening is calculated to be obtained, and further, an instruction is transmitted to the selected flow control valve 52 ′ via each wiring 62 so as to open by the obtained opening. The flow rate control valve 52 ′ is an automatic control valve that adjusts its opening by receiving an instruction via each wiring 62.

As described above, in the bearing device and the lubricating oil supply amount control method thereof according to this embodiment, the amount of lubricating oil o1 supplied to each nozzle 49 is adjusted based on the measurement result of each temperature sensor 55a. The configuration / method that is performed by the automatic control mechanism 60 that automatically controls is adopted. According to this, since the flow rate of the lubricating oil o1 for each tilting pad 43 is automatically adjusted by the automatic control mechanism 60 without requiring human labor, the flow rate can be appropriately controlled with high accuracy and high responsiveness. It becomes possible to do.

Although the number of tilting pads is four in the bearing devices of the first to fifth embodiments, the number of tilting pads is not limited to four, and may be three or less or five or more.

[0049]

The bearing device according to claim 1 of the present invention comprises:
A configuration is adopted in which a lubricating oil supply portion for cooling is directly provided to the cooled portion located on the back surface side corresponding to the downstream side portion of the bearing surface of each tilting pad in the lubricating oil flow direction. According to this configuration, in each tilting pad, the temperature of the bearing surface on the downstream side in the lubricating oil flow direction tends to be particularly high. However, the temperature of the tilting pad tends to rise toward the back side cooled portion corresponding to the high temperature portion. By supplying the adjusted lubricating oil intensively from the cooling lubricating oil supply unit, it becomes possible to effectively cool each tilting pad even with a small amount of lubricating oil. Therefore,
It is possible to prevent the temperature rise of each tilting pad and the occurrence of seizure accompanying it, and it is also possible to achieve a low oil amount.

A bearing device according to a second aspect is the bearing device according to the first aspect, wherein each of the cooling lubricating oil supply portions is located at a center position in the width direction of each tilting pad in the cooled portion. A structure that concentratedly supplies the lubricating oil is adopted. According to this configuration, since the lubricating oil is supplied in a concentrated manner toward the center position in the width direction where the temperature is likely to rise, it is possible to more effectively cool each tilting pad.

A bearing device according to a third aspect is the bearing device according to the first or second aspect, wherein at least a portion including the cooled portion on the back surface side of each tilting pad has a fin. We adopted a configuration that is shaped. According to this configuration, the heat transfer area (heat dissipation area) of each tilting pad is formed by the finned shape.
Therefore, the tilting pad can be cooled more effectively even with the same amount of lubricating oil.

In the bearing device according to the fourth aspect of the present invention, one end side of the tilting pad is exposed and arranged in the lubricating oil flow path facing the back surface side of the bearing surface of each tilting pad, and the other end side of each tilting pad is exposed. A configuration including a heat pipe disposed near the bearing surface on the downstream side in the flow direction of the lubricating oil flowing along the bearing surface is adopted. According to this configuration, the inside of the heat pipe bridged between the high temperature portion (downstream of the lubricating oil flow direction on the bearing surface of the tilting pad) and the low temperature portion (lubricating oil passage on the back surface of the tilting pad) By circulating the fluid, the high temperature portion is intensively cooled from the inside. As a result, even with a small amount of lubricating oil,
Since each tilting pad can be cooled effectively, it is possible to prevent the temperature rise of each tilting pad and the occurrence of seizure accompanying it, and it is also possible to achieve a low oil amount.

A bearing device according to a fifth aspect of the present invention has a structure in which one end side is arranged in a lubricating oil flow path, and the other end side is provided with a heat pipe arranged inside each tilting pad. It was adopted. According to this configuration, the heat from the high temperature portion (in the vicinity of the bearing surface of the tilting pad) is released to the lubricating oil supplied from the lubricating oil direct supply pipe, whereby the high temperature portion is intensively cooled from the inside. be able to. As a result, each tilting pad can be effectively cooled even with a small amount of lubricating oil, so that it is possible to prevent the temperature rise of each tilting pad and the occurrence of seizure accompanying it, and at the same time, reduce the oil consumption. Quantification can also be achieved.

In the bearing device according to a sixth aspect of the present invention, each tilting pad is provided with a temperature sensor for detecting the temperature of each of the tilting pads, and the lubricating oil is directly supplied to each lubricating oil direct supply pipe. A configuration is adopted in which a flow rate adjustment mechanism that adjusts the amount of lubricating oil supplied for each pipe is connected. According to this configuration, the temperature of each tilting pad is
By detecting with a temperature sensor and operating the flow rate adjustment mechanism according to this temperature measurement result, it is possible to distribute more lubricating oil to the tilting pad with a particularly high temperature, so even if the total lubricating oil supply amount is the same, It becomes possible to cool more effectively. Therefore,
It is possible to prevent the temperature rise of each tilting pad and the occurrence of seizure accompanying it, and it is also possible to achieve a low oil amount.

A bearing device according to a seventh aspect is the bearing device according to the sixth aspect, further comprising an automatic control mechanism for performing flow rate adjustment for each flow rate adjusting mechanism based on a detection result from each temperature sensor. The configuration provided is adopted. According to this configuration, the flow rate of the lubricating oil for each tilting pad can be adjusted by
Since the automatic control mechanism automatically performs the operation without requiring manpower, it is possible to appropriately perform the flow rate control with high accuracy and high responsiveness.

According to the eighth aspect of the present invention, there is provided a method for controlling a lubricating oil supply amount of a bearing device, in which the temperature of each tilting pad is individually measured, and lubrication is performed for each tilting pad based on the result of the measurement. The method of adjusting the oil supply is adopted. According to this method, by detecting the temperature of each tilting pad and adjusting the supply amount of lubricating oil according to the temperature measurement result, it is possible to distribute more lubricating oil to the particularly high temperature tilting pad. Therefore, even if the total amount of lubricating oil supplied is the same, the cooling can be performed more effectively. Therefore, it is possible to prevent the temperature rise of each tilting pad and the occurrence of seizure accompanying it, and it is also possible to achieve a low oil amount.

A method for controlling a lubricating oil supply amount of a bearing device according to a ninth aspect is the method for controlling a lubricating oil supply amount for a bearing device according to the eighth aspect, wherein the adjustment of the lubricating oil supply amount is performed by the measurement. We adopted a method that uses an automatic control mechanism that controls automatically based on the results of. According to this method, the automatic control mechanism automatically adjusts the flow rate of the lubricating oil for each tilting pad without requiring human intervention, so that the flow rate can be appropriately controlled with high accuracy and high responsiveness. Is possible.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a bearing device of the present invention and is a partial cross-sectional view when seen in a cross section perpendicular to an axis of a rotating shaft.

FIG. 2 is a view showing the bearing device, and is an enlarged view of a portion B in FIG. 1.

FIG. 3 is a perspective view of a main part showing a modified example of the bearing device.

FIG. 4 is a view showing a second embodiment of the bearing device of the present invention and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotating shaft.

FIG. 5 is a view showing a third embodiment of the bearing device of the present invention and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotating shaft.

FIG. 6 is a view showing a fourth embodiment of the bearing device of the present invention and is a cross-sectional view when seen in a cross section perpendicular to the axis of the rotating shaft.

FIG. 7 is a view showing a fifth embodiment of the bearing device of the present invention, and is a partial cross-sectional view when seen in a cross section perpendicular to the axis of the rotary shaft.

FIG. 8 is a view showing an example of a conventional bearing device, and is a cross-sectional view when seen in a cross section perpendicular to the axis of the rotating shaft.

9 is a view showing the bearing device, which is taken along line AA of FIG. 8. FIG.
FIG.

[Explanation of symbols]

13, 23, 33, 43 ... Tilt pad 14, 24, 34, 44 ... Rotating shaft 15, 25, 35 ... Bearing surface 15a, 25a ... Downstream portion in the lubricating oil flow direction 16, 26 ... Back side 16a: cooled portion 17 ... Nozzle (cooling lubricating oil supply part) 27, 37 ... Heat pipe 39, 49 ... Nozzle (Lubricant oil direct supply pipe) 50 ... Flow rate adjustment mechanism 55a ... Temperature sensor 60: Automatic control mechanism f, f1 ... gap flow path f2: Lubricating oil flow path

Claims (9)

[Claims] 1. A rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and swingably supported in a bearing housing, and a gap flow path between the rotary shaft and each tilting pad. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to the cooled portion located on the back surface side corresponding to the lubricating oil flow direction downstream portion on the bearing surface of each of the tilting pads, A bearing device comprising a cooling lubricating oil supply unit for directly supplying lubricating oil. 2. The bearing device according to claim 1, wherein each of the cooling lubricating oil supply portions concentrates the lubricating oil toward a center position in the width direction of each of the tilting pads in the cooled portion. Bearing device. 3. The bearing device according to claim 1, wherein a portion including at least the cooled portion on the back surface side of each of the tilting pads has a fin shape. Bearing device. 4. A rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and swingably supported in a bearing housing, and gap flow paths between these rotary shafts and the respective tilting pads. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to one side, one end side is exposed and disposed in a lubricating oil flow path facing the back surface side of the bearing surface of each of the tilting pads, and the other end side is A bearing device comprising a heat pipe arranged in the vicinity of a bearing surface of each tilting pad on the downstream side in the flow direction of the lubricating oil flowing along the bearing surface. 5. A rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and are swingably supported in a bearing housing, and gap flow paths between the rotary shaft and the tilting pads are provided. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to one side, one end side is arranged in the flow path of the lubricating oil, and the other end side is
A bearing device, comprising a heat pipe disposed inside each of the tilting pads. 6. A rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and are swingably supported in a bearing housing, and gap flow passages between the rotary shaft and each tilting pad. In a bearing device provided with a lubricating oil direct supply pipe for directly supplying lubricating oil to each of the tilting pads, a temperature sensor for detecting a temperature of each of the tilting pads is provided, and each of the lubricating oil direct supply pipes is provided. The bearing device is characterized in that a flow rate adjusting mechanism for adjusting the lubricating oil supply amount for each of the lubricating oil direct supply pipes is connected to the. 7. The bearing device according to claim 6, further comprising an automatic control mechanism that adjusts a flow rate of each of the lubricating oil direct supply pipes based on a detection result from each of the temperature sensors. Characteristic bearing device. 8. A rotary shaft is supported via a plurality of tilting pads which are circumferentially divided and are swingably supported in a bearing housing, and gap flow paths between the rotary shaft and the tilting pads are provided. In the method for controlling the lubricating oil supply amount of the bearing device for directly supplying the lubricating oil to the above, the temperature of each of the tilting pads is individually measured, and based on the result of the measurement, the lubricating oil of each of the tilting pads is measured. A method for controlling a lubricating oil supply amount of a bearing device, which comprises adjusting the supply amount. 9. The method for controlling a lubricating oil supply amount of a bearing device according to claim 8, wherein the adjustment of the lubricating oil supply amount is performed by an automatic control mechanism that automatically controls based on the result of the measurement. A method for controlling a lubricating oil supply amount of a bearing device, comprising: