JP5911125B2 - Journal bearing device - Google Patents

Description

  The present invention relates to a journal bearing device for a rotary machine such as a turbo machine (a compressor and a driving steam turbine).

  In a tilting type journal bearing (tilting pad bearing) device used in a rotating machine such as a turbomachine (compressor and driving steam turbine), the LOP (tilting pad bearing) device has been conventionally used because of the superior vibration stability of the rotor of the rotating machine. Load on pad) structure is adopted.

  FIG. 5 is a transverse sectional view of a conventional tilting pad bearing device having an LOP structure, and FIG. 6 is a sectional view taken along line AA in FIG.

  As shown in FIGS. 5 and 6, the conventional tilting pad bearing device 8 includes a tilting pad bearing 1 that is a tilting journal bearing and a bearing base 2 to which the tilting pad bearing 1 is attached. Is. The tilting pad bearing 1 has an annular bearing housing 3, five bearing pads 5A, 5B, 5C, 5D, and 5E, and three oil supply pieces 7A, 7B, and 7C.

Each of the bearing pads 5A to 5E has an arc shape in cross section (see FIG. 5), and is arranged on the inner peripheral surface 3a of the bearing housing 3 at equal intervals along the circumferential direction of the inner peripheral surface 3a. It has an annular shape and rotatably supports a rotor (rotating shaft) 4 of a rotating machine such as a turbomachine inserted horizontally inside. Each of the bearing pads 5 </ b> A to 5 </ b> B is provided with a pivot 5 a on the back surface (outer surface), and the spherical surface 5 b of the pivot 5 a is in contact with the inner peripheral surface 3 a of the bearing housing 3. Therefore, each of the bearing pads 5A to 5B can swing in the circumferential direction or the axial direction of the rotor 4 around the pivot 5a (contact point between the spherical surface 5b and the inner peripheral surface 3a). As a result, it is self-aligning.
Further, the bearing pads 5A to 5E are attached to the bearing housing 3 by the pad fixing bolts 6 so as to be able to swing, and the movement of the inner peripheral surface 3a of the bearing housing 3 in the circumferential direction is restricted. Has been.

  The tilting pad bearing 1 has an LOP structure in which one bearing pad 5A is positioned directly below the rotor 4 and the load of the rotor 4 is supported by the one bearing pad 5A.

The oil supply pieces 7A to 7C are provided with an oil supply nozzle 7a, and in particular, in order to supply oil to the inner surfaces 5d of the lower three bearing pads 5A, 5B, 5E, the bearing pads 5A, 5B and between the bearing pads 5B and 5C. When the rotor 4 rotates in the direction of arrow B in FIG. 5, the lubricating oil discharged from the oil supply nozzles 7a of the oil supply pieces 7A to 7C is between the inner surface 5d of the bearing pads 5A, 5B, 5E and the outer peripheral surface 4a of the rotor 4. To form an oil film between them.
As prior art documents describing conventional tilting pad bearings, for example, there are the following.

JP 2009-168205 A

  In recent years, especially for large-sized tilting journal bearings (tilting pad bearings), there is a case where a tilting pad bearing having an LBP (Load between pad) structure is required by a customer who purchases a turbo machine or the like. . LBP structure tilting pad bearings share and support the rotor load with the two lower bearing pads, so the bearing pad temperature is lower than LOP structure, and the bearing static characteristics (temperature characteristics) are excellent. ing.

  However, since the tilting pad bearing of the LBP structure is inferior to the tilting pad bearing of the LOP structure with respect to the vibration stability of the rotor, the improvement of the vibration stability is desired.

  Accordingly, in view of the above circumstances, an object of the present invention is to provide a journal bearing device such as a tilting journal bearing (tilting pad bearing) device having an LBP structure and excellent vibration stability.

A journal bearing device according to a first aspect of the present invention that solves the above-described problem has a bearing housing and a plurality of bearing pads disposed on an inner peripheral surface of the bearing housing, and is horizontally disposed inside the plurality of bearing pads. A journal bearing having an LBP structure that supports the load of the rotary shaft of the inserted rotary machine with two of the plurality of bearing pads;
An annular bearing ring that surrounds the periphery of the bearing housing and that has oil reservoirs filled with oil on both sides in the horizontal direction;
A bearing stand to which the bearing ring is attached;
Have
An annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is covered with the inner peripheral surface of the bearing base,
The oil reservoir is an oil reservoir groove in which both sides in the horizontal direction of the annular groove are deepened ,
The oil that has circulated through the oil passage formed in the bearing stand is configured to be filled in the oil reservoir groove through the annular groove,
It is characterized by.

The journal bearing device according to the second aspect of the present invention has a bearing housing and a plurality of bearing pads arranged on the inner peripheral surface of the bearing housing, and is horizontally inserted inside the plurality of bearing pads. A journal bearing with an LBP structure that supports the load of the rotating shaft of the rotating machine with two of the plurality of bearing pads;
A bearing ring surrounding the bearing housing;
A bearing stand to which the bearing ring is attached and an oil sump portion filled with oil is formed on both sides in the horizontal direction;
It is characterized by having.

The journal bearing device of the third invention is the journal bearing device of the second invention,
An annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is covered with the inner peripheral surface of the bearing base,
The oil reservoir is an oil reservoir groove formed on both sides of the inner peripheral surface of the bearing base in the horizontal direction, and is connected to the annular groove,
The oil that has circulated through the oil passage formed in the bearing stand is configured to be filled in the oil reservoir groove through the annular groove,
It is characterized by.

Moreover, the journal bearing device of the fourth invention is the journal bearing device of any one of the first to third inventions,
The journal bearing is characterized in that the bearing pad is a tilting pad bearing that can swing around a pivot provided on the back surface of the bearing pad.

  According to the journal bearing device of the first aspect of the present invention, the journal bearing device has a bearing housing and a plurality of bearing pads arranged on the inner peripheral surface of the bearing housing, and is horizontally inserted inside the plurality of bearing pads. A journal bearing having an LBP structure that supports the load of the rotating shaft of the rotating machine with two of the plurality of bearing pads, and surroundings the bearing housing and oil on both sides in the horizontal direction. An annular bearing ring in which an oil sump portion filled with a bearing ring is formed, and a bearing stand to which the bearing ring is attached, and the oil sump portions on both sides in the horizontal direction of the bearing ring As a result, it is possible to provide asymmetry in the oil film rigidity (support rigidity of the entire journal bearing device) in the horizontal and vertical directions of the journal bearing device, thus improving the vibration stability of the rotating shaft. To. Therefore, it is possible to realize a journal bearing device having an LBP structure that has excellent bearing static characteristics (temperature characteristics) and vibration stability.

Further, according to the journal bearing device of the first invention, an annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is covered with the inner peripheral surface of the bearing base, The oil reservoir is an oil reservoir groove in which both sides in the horizontal direction of the annular groove are deepened, and the oil that has circulated through the oil passage formed in the bearing base passes through the annular groove. Since it is the structure filled with the said oil sump groove | channel, the oil filling to an oil sump groove | channel can be performed easily and reliably with a simple structure.

According to the journal bearing device of the second invention, the journal bearing device has a bearing housing and a plurality of bearing pads arranged on the inner peripheral surface of the bearing housing, and is horizontally inserted inside the plurality of bearing pads. A journal bearing having an LBP structure for supporting the load of the rotating shaft of the rotating machine by two of the plurality of bearing pads, a bearing ring surrounding the periphery of the bearing housing, and the bearing ring are attached. And having a bearing base in which oil reservoirs filled with oil are formed on both sides in the horizontal direction, and by forming oil reservoirs on both sides in the horizontal direction of the bearing base Since the oil film rigidity (support rigidity of the entire journal bearing device) in the horizontal direction and the vertical direction of the journal bearing can be made asymmetric, the vibration stability of the rotating shaft is improved. Therefore, it is possible to realize a journal bearing device having an LBP structure that has excellent bearing static characteristics (temperature characteristics) and vibration stability.

According to the journal bearing device of the third invention, in the journal bearing device of the second invention, an annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is an inner peripheral surface of the bearing base. The oil sump portion is an oil sump groove formed on both sides of the inner peripheral surface of the bearing base in the horizontal direction, and is connected to the annular groove. Since the oil flowing through the formed oil passage is configured to be filled into the oil sump groove through the annular groove, it is possible to easily fill the oil sump groove with oil. This can be done easily and reliably with the configuration.

A journal bearing device according to a fourth aspect of the present invention is the journal bearing device according to any one of the first to third aspects, wherein the journal bearing swings around a pivot provided on a back surface of the bearing pad. Since it is a movable tilting pad bearing, the tilting pad bearing device having the effect of any of the first to third inventions can be realized.

It is a cross-sectional view which shows the structure of the tilting type journal bearing (tilting pad bearing) apparatus which concerns on Embodiment 1 of this invention. It is CC sectional view taken on the line in FIG. 1 (longitudinal sectional view). It is a cross-sectional view which shows the structure of the tilting type journal bearing (tilting pad bearing) apparatus which concerns on Example 2 of this invention. FIG. 4 is a sectional view (longitudinal sectional view) taken along line D-D in FIG. 3. It is a cross-sectional view showing the configuration of a conventional tilting journal bearing (tilting pad bearing) device having an LOP structure. FIG. 6 is a cross-sectional view (transverse cross-sectional view) taken along line AA in FIG. 5.

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

<Embodiment 1>
As shown in FIGS. 1 and 2, a tilting pad bearing device 10 according to Embodiment 1 of the present invention includes a tilting pad bearing 11 that is a tilting journal bearing, an annular bearing ring 41, It comprises a bearing stand 12 and rotatably supports a rotor (rotating shaft) 14 of a rotating machine such as a turbomachine (compressor and driving steam turbine).

  The tilting pad bearing 11 has an LBP structure, and includes an annular bearing housing 13, an odd number (in the illustrated example, five) bearing pads 15A, 15B, 15C, 15D, and 15E, and bearing pads 15A to 15E. The same number of odd (five in the illustrated example) oiling pieces 16A, 16B, 16C, 16D, and 16E, and a plurality (six in the illustrated example) of eccentric adjustment mechanisms 20A, 20B, 20C, 20D, 20E, and 20F have. The eccentricity adjusting mechanism 20A is attached when the tilting pad bearing 11 is used for the LOP structure, and is not shown in FIGS.

  The bearing housing 13 includes a semicircular first bearing housing piece 13A and a second bearing housing piece 13B which are divided into two. The first bearing housing piece 13 </ b> A and the second bearing housing piece 13 </ b> B are aligned by the alignment pin 17 and fastened by the bolt 18, thereby forming the annular bearing housing 13.

  The bearing housing 13 has an annular housing body 13c and an annular housing side plate 13e fixed to both side surfaces (both surfaces in the axial direction of the rotor 14) 13d of the housing body 13c with bolts 30. It consists of An annular recess (groove) 13f along the circumferential direction of the bearing housing 13 is formed on both side surfaces 13d of the housing main body 13c. By covering the recess 13f with the housing side plate 13e, the periphery of the bearing housing 13 is covered. An annular oil passage (hereinafter referred to as an annular oil passage) 13g along the direction is formed.

An oil passage 13k extending in the axial direction of the rotor 14 is formed in the bearing housing 13 (housing main body 13c) at a position corresponding to between the bearing pads 15C and 15D (oil supply piece 16C). The first oil supply port 13m (oil supply in the case of the LBP structure) is connected to the annular oil passages 13g on both sides and extends from the oil passage 13k to the outer peripheral surface 13h of the bearing housing 13 (housing main body 13c). Mouth) is formed. Further, the bearing housing 13 (housing body 13c) has a position corresponding to the bearing pad 15A,
That is, an oil passage 13i extending in the axial direction of the rotor 14 is formed at a position rotationally symmetrical by 180 degrees in the circumferential direction of the bearing housing 13 with respect to the first oil supply port 13m, and both ends of the oil passage 13i are on both sides. A second oil supply port 13j (oil supply port in the case of the LOP structure) is formed which is connected to the annular oil passage 13g and extends outward from the oil passage 13i to the outer peripheral surface 13h of the bearing housing 13 (housing main body 13c). ing. Accordingly, the first oil supply port 13 m and the second oil supply port 13 j are in a 180-degree rotationally symmetrical positional relationship with respect to each other in the circumferential direction of the bearing housing 13 (the circumferential direction of the annular oil passage 13g).

  Further, in the bearing housing 13 (housing main body 13c), oil passages 13n, 13o, 13p extending in the axial direction of the rotor 14 are also provided at positions corresponding to the oil supply pieces 16A, 16B, 16D, 16E, similarly to the oil passage 13k. , 13q are formed, and both ends of the oil passages 13n, 13o, 13p, 13q are respectively connected to the annular oil passages 13g on both sides.

Each of the bearing pads 15A to 15E has an arc shape in cross section (see FIGS. 1 and 3), and the inner circumferential surface 13a of the bearing housing 13 (first and second bearing housing pieces 13A and 13B) It arrange | positions at equal intervals along the circumferential direction of the surrounding surface 13a, has comprised the annular | circular shape, and supports the rotor 14 penetrated horizontally by the inside so that rotation is possible. Each of the bearing pads 15 </ b> A to 15 </ b> E is provided with a pivot 15 a on the back surface (outer surface), and the spherical surface 15 b of the pivot 15 a is in contact with the inner peripheral surface 13 a of the bearing housing 13. Accordingly, each bearing pad 15A～15 E is about a pivot 15a (contact of the inner peripheral surface 13a and the spherical 15b), a swingable in the circumferential direction and the axial direction of the rotor 14, the rotor 14 It is self-aligning as it moves.

The lubrication pieces 16A to 16E are provided between the bearing pads 15A and 15B, between the bearing pads 15B and 15C, between the bearing pads 15C and 15D, between the bearing pads 15D and 15E, and between the bearing pads 15A and 15E. And the movement of the inner peripheral surface 13a of the bearing housing 13 in the circumferential direction is restricted for each of the bearing pads 15A to 15E. In other words, the bearing pads 15A~15E are rotatably supports the rotor 14 in a state where the positioning of the circumferential direction is made by the refueling pieces 16A~16 E.

  The oil supply pieces 16A to 16E are fixed to the bearing housing 13 by fixing means. In the illustrated example, the oil supply pieces 16 </ b> A to 16 </ b> E have a convex portion 16 a formed on the back side, and the convex portion 16 a is fitted into a concave portion 13 b formed on the inner peripheral surface 13 a of the bearing housing 13. It is fixed to the bearing housing 13.

Each of the oil supply pieces 16A to 16E has an oil supply nozzle 16b for supplying lubricating oil to the inner surfaces (support surfaces) 15c of the bearing pads 15A to 15E. The oil supply nozzle 16b has a discharge hole 16d formed in the oil supply pieces 16A to 16E and oil passages 16c and 16e. The oil passage 16 c extends in the axial direction of the rotor 14. The discharge hole 16d is a hole opened at the tip of the oil supply pieces 16A to 16E and communicates with the oil passage 16c. A plurality of discharge holes 16 d are provided and are arranged along the axial direction of the rotor 14. The oil passage 16e of the oil supply piece 16C extends outward in the radial direction of the rotor 14 from the oil passage 16c, is connected to the first oil supply port 13m, and also extends in the axial direction of the rotor 14, so that the bearing housing 13 ( It is also connected to an oil passage 13k formed in the housing body 13c). The oil passages 16e of the oil supply pieces 16A, 16B, 16D, and 16E extend outward in the radial direction of the rotor 14 from the oil passage 16c and also extend in the axial direction of the rotor 14, and the bearing housing 13 (housing body 13c). Are connected to oil passages 13n, 13o, 13p and 13q, respectively.

  In the first embodiment, in the tilting pad bearing 11 having the LBP structure, the bearing ring 41 is provided in order to improve the vibration stability of the rotor 14. The bearing ring 41 surrounds the bearing housing 13. 2 denotes an alignment pin for aligning the bearing ring 41 and the bearing housing 13.

  As shown in FIGS. 1 and 2, an annular groove (hereinafter referred to as an annular groove) 41 b is formed on the outer peripheral surface 41 a of the bearing ring 41. Moreover, both sides of the annular groove 41b in the horizontal direction (positions symmetric with respect to the rotor 14) are deeply formed on both sides of the bearing ring 41 in the horizontal direction (positions symmetric with respect to the rotor 14). That is, by processing the annular groove 41b deeper than the portions other than the both sides in the horizontal direction (that is, by forming a deep groove), an oil reservoir groove 41c is formed as an oil reservoir portion filled with oil. . The oil sump groove 41c is filled with lubricating oil supplied via the annular groove 41b.

The bearing ring 41 includes a semicircular first bearing ring piece 41 </ b> A and a second bearing ring piece 41 </ b> B divided into two parts, and is attached to the bearing stand 12. An annular bearing ring 41 is configured by aligning the first bearing ring 41A and the second bearing ring piece 41B with an alignment pin (not shown) and fastening with a bolt (not shown). doing. The lower first bearing ring piece 41A is fitted into a semicircular recess 12d formed in the bearing base body 12c of the bearing base 12 and aligned by an alignment pin (not shown). The second bearing ring piece 41 </ b> B is covered with a semicircular bearing cap 12 e of the bearing base 12 and is aligned with an alignment pin (not shown). That is, the periphery of the bearing ring 41 is surrounded by the inner peripheral surface 12a composed of the bearing base body 12c (recess 12d) and the bearing cap 12e. For this reason, the annular groove 41b and the oil sump groove 41c of the bearing ring 41 are covered by the inner peripheral surface 12a of the bearing base 12 (the bearing base body 12c and the bearing cap 12e) to form an annular oil passage. .
The bearing cap 12e is aligned with the bearing base body 12c by an alignment pin (not shown) and fixed by a bolt (not shown).

  An oil passage 41 e is formed at the lower end of the bearing ring 41. The oil passage 41e extends in the radial direction of the rotor 14 and is connected to the annular groove 41b.

  The eccentricity adjustment mechanisms 20B to 20F are respectively provided at a plurality of locations corresponding to the four bearing pads 15B to 15E (that is, four locations) and at a location corresponding to the space between the bearing pads 15C and 15D (oil supply piece 16C). Provided. Although not shown, when used for the LOP structure, an eccentricity adjusting mechanism 20A is provided at a position corresponding to the bearing pad 15A.

The eccentric adjustment mechanisms 20 </ b> B to 20 </ b> F are interposed between the outer peripheral surface 13 h of the bearing housing 13 and the inner peripheral surface 41 d of the bearing ring 41 that surrounds the periphery of the bearing housing 13. By adjusting the support position, the center of the inner surface 15c of the bearing pads 15A to 15E forming an annular shape can be adjusted in the vertical direction with respect to the center of the inner peripheral surface 12a of the bearing base 12.
Specifically, each of the eccentricity adjusting mechanisms 20B to 20F includes a shim 21 and an outer liner 22 that abuts against the inner peripheral surface 12a of the bearing stand 12 and presses the shim 21, and the shim 21 and the outer liner 22 are bolted 23. The structure is fixed to the outer peripheral surface 13h of the bearing housing 13 (housing main body 13c). In the outer liner 22, an outer surface 22 a that contacts the inner peripheral surface 12 a of the bearing stand 12 is a curved surface along the inner peripheral surface 12 a, and an inner surface 22 b on the shim 21 side is a flat surface. Although illustration is omitted, the eccentricity adjusting mechanism 20A has the same configuration as the eccentricity adjusting mechanisms 20B to 20F. The eccentricity adjustment mechanisms 20A to 20F are attached to a flat attachment surface 13r in which a part of the outer peripheral surface 13h of the bearing housing 13 is cut out.

  Also, oil supply holes 21a and 22c are opened in the shim 21 and the outer liner 22 of the eccentricity adjusting mechanism 20D provided at a corresponding position between the bearing pads 15C and 15D, respectively. Although illustration is omitted, oil supply holes are also opened in the shim and outer liner of the eccentricity adjusting mechanism 20A provided at a position corresponding to the bearing pad 15A.

  As shown in FIGS. 1 and 2, when the tilting pad bearing 11 is used for the LBP structure, the tilting pad is positioned so that a portion (oil supply piece 16 </ b> C) between the bearing pads 15 </ b> C and 15 </ b> D is positioned directly below the rotor 14. The bearing 11 is attached to the bearing stand 12, and the load of the rotor 14 is shared and supported by the two bearing pads 15C and 15D.

In the case of the LBP structure, by adjusting (selecting) the number and thickness of the shims 21 in the eccentricity adjusting mechanism 20D provided at a position corresponding to the space between the bearing pads 15C and 15D (oil supply piece 16C), the bearing ring 41 The support position in the vertical direction of the bearing housing 13 is adjusted, and the center of the inner surface 15c of the bearing pads 15A to 15E forming an annular shape (virtual circle) is eccentric in the vertical direction with respect to the center of the inner peripheral surface 12a of the bearing base 12. Thus, when the rotor 14 is floated by the lubricating oil film (oil film) formed between the inner surface 15c of the lower bearing pads 15C and 15D and the outer peripheral surface 14a of the rotor 14 during rotation of the rotor 14, Is made to coincide with the center of the inner peripheral surface 12 a of the bearing stand 12. In general, since the thickness of the oil film is smaller than the amount of drop of the rotor 14 due to its own weight when stopped, an annular shape (virtual circle) is formed with respect to the center of the inner peripheral surface 12a of the bearing base 12. The center of the inner surface 15c of the bearing pads 15A to 15E formed is decentered upward.
In the case of the LBP structure, the second oil supply port 13j located immediately above the rotor 14 is not provided with the eccentricity adjusting mechanism 20A, and the second oil supply port 13j is closed with a lid (plate) 25, Oil leakage from the second oil supply port 13j is prevented. Also, in the eccentric adjustment mechanisms 20B, 20C, 20E, and 20F other than the eccentric adjustment mechanism 20D, the outer liner 22 is attached to the inner peripheral surface 41d of the bearing ring 41 by adjusting (selecting) the number and thickness of the shims 21. Adjust to abut.

  In the case of the LBP structure, the annular groove 41 b and the oil passage 41 e of the bearing ring 41 are connected to the first oil supply port 13 m of the bearing housing 13 and the oil passage 12 b formed in the bearing base 12. .

  The flow of the lubricating oil in the case of the LBP structure will be described. After the bearing ring 41 and the tilting pad bearing 11 are attached to the bearing base 12, when the lubricating oil is sent from an oil supply device (not shown), this lubricating oil However, after flowing through the oil passage 12b of the bearing stand 12, it flows into the annular groove 41b, flows through the annular groove 41b, and is filled in the oil sump groove 41c.

  Further, after flowing through the oil passage 12b of the bearing stand 12, the lubricating oil also flows into the first oil supply port 13m through the oil passage 41e and the oil supply holes 21a and 22c of the eccentricity adjusting mechanism 20D (oil sump). After filling the groove 14d, it flows into only the first oil filler port 13m). The lubricating oil that has flowed into the first oil filler opening 13m flows into the oil passage 16e of the oil filler piece 16C. The lubricating oil flowing into the oil passage 16e flows through the oil passage 16e, flows into the oil passage 16c, and is discharged from the discharge hole 16d to the outer peripheral surface 14a of the rotor 14. The lubricating oil that has flowed into the first oil supply port 13m also flows into the annular oil passage 13g via the oil passage 13k, and flows through the annular oil passage 13g. The lubricating oil flowing through the annular oil passage 13g flows into the oil passage 16e of the oil supply pieces 16A, 16B, 16D, and 16E through the oil passages 13n, 13o, 13p, and 13q. The lubricating oil flowing into the oil passage 16e flows through the oil passage 16e, flows into the oil passage 16c, and is discharged from the discharge hole 16d to the outer peripheral surface 14a of the rotor 14. As a result, lubricating oil is supplied between the inner surfaces 15c of the bearing pads 15A to 15E and the outer peripheral surface 14a of the rotor 14. At this time, an oil film is formed between the inner surfaces 15c of the lower bearing pads 15C and 15D and the outer peripheral surface 14a of the rotor 14, and the center of the rotor 14 lifted by the oil film is the center of the inner peripheral surface 12a of the bearing base 12. Match the center. The lubricating oil supplied between the inner surface 15c of the bearing pads 15A to 15E and the outer peripheral surface 14a of the rotor 14 is then discharged from the gap between the bearing pads 15A to 15E and the oil supply pieces 16A to 16E.

Although illustration and detailed description are omitted, when the tilting pad bearing 11 is used for the LOP structure, the tilting pad bearing 11 having the LBP structure shown in FIGS. 1 and 2 is 180 degrees in the circumferential direction. Used in a rotated state. In the case of this LOP structure, the eccentric adjustment mechanism 20D is not provided in the portion of the first oil supply port 13m located directly above the rotor 14, and the first oil supply port 13m is closed with a lid (plate). An eccentricity adjustment mechanism 20A is provided at a position corresponding to the bearing pad 15A, and in this eccentricity adjustment mechanism 20A, the number of shims and the thickness are adjusted (selected) so that the bearing housing 13 is supported in the vertical direction by the bearing ring 41. The center of the inner surface 15c of the bearing pads 15A to 15E forming an annular shape (virtual circle) is decentered in the vertical direction with respect to the center of the inner peripheral surface 12a of the bearing base 12. Further, in the eccentric adjustment mechanisms 20B, 20C, 20E, and 20F other than the eccentric adjustment mechanism 20A, the outer liner 22 is attached to the inner peripheral surface 12a of the bearing base 12 by adjusting (selecting) the number and thickness of the shims 21. Adjust to abut.

  As described above, according to the tilting pad bearing device 10 of the first embodiment, the bearing housing 13 and the plurality of bearing pads 15A to 15E arranged on the inner peripheral surface 13a of the bearing housing 13 are provided. The load of the rotor 14 of the rotating machine horizontally inserted inside the plurality of bearing pads 15A to 15E is applied to the lower two bearing pads 15C and 15C of the plurality of bearing pads 15A to 15E. A tilting pad bearing 11 having an LBP structure supported by a ring and an annular shape that surrounds the periphery of the bearing housing 13 and is formed with an oil reservoir (oil reservoir groove 41c) filled with oil on both sides in the horizontal direction. The bearing ring 41 and the bearing stand 12 to which the bearing ring 41 is attached are characterized in that an oil reservoir (oil reservoir groove 41) is formed on both sides of the bearing ring 41 in the horizontal direction. ), The oil film rigidity in the horizontal direction and the vertical direction of the tilting pad bearing device 10 (support rigidity of the entire tilting pad bearing device 10) can be made asymmetric. Improves. Therefore, it is possible to realize the tilting pad bearing device 10 having the LBP structure which has excellent bearing static characteristics (temperature characteristics) and vibration stability.

Further, according to the tilting pad bearing device 10 of the first embodiment, the annular groove 41 b is formed on the outer peripheral surface 41 a of the bearing ring 41, and the annular groove 41 b is formed in the bearing base 12. The oil reservoir is covered with the peripheral surface 12a, and the oil reservoir is an oil reservoir groove 41c obtained by deeply processing both sides in the horizontal direction of the annular groove 41b, and flows through the oil passage 12b formed in the bearing base 12. Since the lubricating oil is configured to be filled into the oil reservoir groove 41c through the annular groove 41b , the oil reservoir groove 41c can be filled easily and reliably with a simple configuration. It can be carried out.

<Embodiment 2>
As shown in FIGS. 3 and 4, in the tilting pad bearing device 50 according to the second embodiment of the present invention, an oil reservoir filled with oil is used instead of the oil reservoir groove 41 c of the first embodiment. Oil reservoir grooves 12f as portions are formed on both sides of the bearing base 12 (bearing base body 12c and bearing cap 12e) in the horizontal direction (positions symmetrical with respect to the rotor 14).
The oil sump groove 12f is formed on both sides of the inner peripheral surface 12a of the bearing base 12 in the horizontal direction (symmetrical positions with respect to the rotor 14), and is connected to the annular groove 41b of the bearing ring 41. The lubricating oil supplied through the annular groove 41b is filled.

  The flow of the lubricating oil in the case of the LBP structure of FIGS. 3 and 4 will be described. After the bearing ring 41 and the tilting pad bearing 11 are attached to the bearing base 12, the lubricating oil is sent from an oil supply device (not shown). Then, this lubricating oil flows through the oil passage 12b of the bearing base 12, then flows into the annular groove 41b, flows through the annular groove 41b, and is filled in the oil reservoir groove 12f.

  Further, after flowing through the oil passage 12b of the bearing stand 12, the lubricating oil also flows into the first oil supply port 13m through the oil passage 41e and the oil supply holes 21a and 22c of the eccentricity adjusting mechanism 20D (oil sump). After filling into the groove 12f, it flows into only the first oil filler port 13m). Since the subsequent flow of the lubricating oil is the same as in the first embodiment, detailed description thereof is omitted here.

  Further, the other configuration of the tilting pad bearing device 50 according to the second embodiment is the same as that of the tilting pad bearing device 10 according to the first embodiment, and a detailed description thereof is omitted here. .

  As described above, according to the tilting pad bearing device 50 of the second embodiment, the bearing housing 13 and the plurality of bearing pads 15A to 15E arranged on the inner peripheral surface 13a of the bearing housing 13 are provided. The load of the rotor 14 of the rotating machine horizontally inserted inside the plurality of bearing pads 15A to 15E is applied to the lower two bearing pads 15C and 15D among the plurality of bearing pads 15A to 15E. An LBP structure tilting pad bearing 11 to be supported, a bearing ring 41 surrounding the bearing housing 13, and an oil reservoir (oil sump) in which the bearing ring 41 is attached and oil is filled in both sides in the horizontal direction. The groove 12f) is formed with a bearing base 12, and an oil reservoir (oil reservoir groove 12f) is formed on both sides of the bearing base 12 in the horizontal direction. Accordingly, it is possible to provide the asymmetry in the horizontal and vertical oil film rigidity of tilting pad bearing device 50 (support rigidity of the entire tilting pad bearing device 50), the vibration stability of the rotor 14 is improved. Accordingly, it is possible to realize the tilting pad bearing device 50 having the LBP structure which is excellent in the bearing static characteristics (temperature characteristics) and excellent in vibration stability.

  Further, according to the tilting pad bearing device 50 of the second embodiment, the annular groove 41b is formed on the outer peripheral surface 41a of the bearing ring 41, and the annular groove 41b is formed on the inner periphery of the bearing base. The oil reservoir is covered with a surface 12a, and the oil reservoir is an oil reservoir groove 12f formed on both sides of the inner peripheral surface 12a of the bearing base 12 in the horizontal direction, and is connected to an annular groove 41b. Since the lubricating oil that has flowed through the oil passage 12b formed in the bearing base 12 is filled in the oil sump groove 12f via the annular groove 41b, the oil sump groove 12f The oil can be easily and reliably filled with a simple configuration.

  In the above description, the case where the present invention is applied to the tilting pad bearing 11 capable of sharing the LBP structure and the LOP structure has been described. However, the present invention is not limited to this, and the present invention is not limited to the LBP structure. (For example, oil is supplied only to the lower bearing pad, and the inner surface of the lower bearing pad is decentered in the vertical direction with respect to the center of the outer peripheral surface of the bearing housing. And a tilting pad bearing having a configuration in which the center of the rotor lifted by the oil film formed between the rotor and the outer peripheral surface of the rotor coincides with the center of the inner peripheral surface of the bearing base.

In the above description, the oil supply passage (annular groove 41b, oil reservoir groove 41c, oil passage 41e) of the bearing ring 41 and the oil supply passage (oil supply holes 21a, 22c, supply ports 13f, 13m, oil passage 13i) of the tilting pad bearing 11 are used. , 13k, 13n, 13o, 13p, 13q, 16c, 16e, and the discharge hole 16d), but is not limited to this, and the bearing ring 41 and the tilting pad bearing 11 are separately provided. The structure which supplies oil may be sufficient.
In the above description, the case where five bearing pads 15A to 15E are arranged has been illustrated. However, the present invention is not limited to this, and a plurality of tilting pad bearings to which the present invention is applied (for example, three) (4, 6, 7, etc.) bearing pads may be of the LBP structure arranged on the inner peripheral surface of the bearing housing.
Further, the present invention is not necessarily limited to the tilting type but can be applied to journal bearings other than the tilting type.

  The present invention relates to a journal bearing device of a rotary machine such as a turbomachine (compressor and driving steam turbine), and a tilting journal bearing (tilting) in which a bearing pad can swing around a pivot on the back surface thereof. It is useful when applied to pad bearings).

DESCRIPTION OF SYMBOLS 10 Tilting pad bearing apparatus 11 Tilting pad bearing 12 Bearing stand 12a Inner peripheral surface 12b Oil passage 12c Bearing base main body 12d Recess 12e Bearing cap 12f Oil reservoir groove 13 Bearing housing 13a Inner peripheral surface 13b Recess 13c Housing main body 13d Side surface 13e Housing Side plate 13f Recess 13g Annular oil passage (annular oil passage)
13h Outer peripheral surface 13i Oil passage 13j Second oil supply port 13k Oil passage 13m First oil supply port 13n, 13o, 13p, 13q Oil passage 13r Mounting surface 14 Rotor (rotary shaft)
14a Outer peripheral surface 15A, 15B, 15C, 15D, 15E Bearing pad 15a Pivot 15b Spherical surface 15c Inner surface (support surface)
16A, 16B, 16C, 16D, 16E Oil supply piece 16a Convex portion 16b Oil supply nozzle 16c Oil passage 16d Discharge hole 16e Oil passage 17 Alignment pin 18 Bolt 20A, 20B, 20C, 20D, 20E, 20F Eccentricity adjustment mechanism 21 Shim 21a Oil supply Hole 22 Outer liner 22a Outer surface 22b Inner surface 22c Oil supply hole 23 Bolt 25 Lid (plate)
26 alignment pin 30 bolt 41 bearing ring 41A first bearing ring piece 41B second bearing ring piece 41a outer peripheral surface 41b annular groove (annular groove)
41c Oil sump groove 41d Inner peripheral surface 41e Oil passage 50 Tilting pad bearing device

Claims (4)

A bearing housing; and a plurality of bearing pads disposed on an inner peripheral surface of the bearing housing, wherein the plurality of loads of a rotating shaft of a rotating machine horizontally inserted inside the plurality of bearing pads are A journal bearing having an LBP structure supported by two of the bearing pads;
An annular bearing ring that surrounds the periphery of the bearing housing and that has oil reservoirs filled with oil on both sides in the horizontal direction;
A bearing stand to which the bearing ring is attached;
Have
An annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is covered with the inner peripheral surface of the bearing base,
The oil reservoir is an oil reservoir groove in which both sides in the horizontal direction of the annular groove are deepened ,
The oil that has circulated through the oil passage formed in the bearing stand is configured to be filled in the oil reservoir groove through the annular groove,
Journal bearing device characterized by A bearing housing; and a plurality of bearing pads disposed on an inner peripheral surface of the bearing housing, wherein the plurality of loads of a rotating shaft of a rotating machine horizontally inserted inside the plurality of bearing pads are A journal bearing having an LBP structure supported by two of the bearing pads;
A bearing ring surrounding the bearing housing;
A bearing stand to which the bearing ring is attached and an oil sump portion filled with oil is formed on both sides in the horizontal direction;
A journal bearing device comprising: The journal bearing device according to claim 2,
An annular groove is formed on the outer peripheral surface of the bearing ring, and the annular groove is covered with the inner peripheral surface of the bearing base,
The oil reservoir is an oil reservoir groove formed on both sides of the inner peripheral surface of the bearing base in the horizontal direction, and is connected to the annular groove,
The oil that has circulated through the oil passage formed in the bearing stand is configured to be filled in the oil reservoir groove through the annular groove,
Journal bearing device characterized by In the journal bearing device according to any one of claims 1 to 3,
The journal bearing device, wherein the journal pad is a tilting pad bearing that can swing around a pivot provided on a back surface of the bearing pad.

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