Squeeze film damper bearing and rotary machine provided with same
阅读说明:本技术 挤压油膜阻尼器轴承及具备该挤压油膜阻尼器的旋转机械 (Squeeze film damper bearing and rotary machine provided with same ) 是由 山胁映明 时政泰宪 佐野岳志 岩津广大 于 2020-02-05 设计创作,主要内容包括:一种挤压油膜阻尼器轴承及具备该挤压油膜阻尼器的旋转机械。本挤压油膜阻尼器轴承具有:内部支承环,其支承轴承部;外部支承环,其设置于内部支承环的外周;以及散逸部,其设置于外部支承环以及内部支承环中的至少任一方,将振动能量散逸。在形成于内部支承环的外周面与外部支承环的内周面之间的阻尼器间隙填充有粘性流体。(Provided are a squeeze film damper bearing and a rotary machine provided with the squeeze film damper. The squeeze film damper bearing comprises: an inner support ring supporting the bearing portion; an outer support ring disposed on an outer periphery of the inner support ring; and a dissipating portion provided on at least one of the outer support ring and the inner support ring, for dissipating the vibration energy. A damper gap formed between an outer peripheral surface of the inner support ring and an inner peripheral surface of the outer support ring is filled with a viscous fluid.)
1. A squeeze film damper bearing, wherein,
the squeeze film damper bearing has:
an inner support ring supporting the bearing portion;
an outer support ring disposed on an outer periphery of the inner support ring; and
a dissipating portion provided on at least one of the outer support ring and the inner support ring to dissipate vibration energy,
a damper gap formed between an outer circumferential surface of the inner support ring and an inner circumferential surface of the outer support ring is filled with a viscous fluid.
2. The squeeze film damper bearing of claim 1 wherein,
the dissipation part has one or more cavities in at least one of an inner peripheral surface of the outer support ring and an outer peripheral surface of the inner support ring.
3. The squeeze film damper bearing of claim 1 wherein,
the dissipation portion has one or more circumferential grooves in at least one of an inner circumferential surface of the outer support ring and an outer circumferential surface of the inner support ring.
4. The squeeze film damper bearing of claim 1 wherein,
the dissipation part has:
one or more first protrusions provided on an inner circumferential surface of the outer support ring; and
one or more second protrusions provided on an outer circumferential surface of the inner support ring,
the first convex portions and the second convex portions are alternately arranged in a predetermined direction,
a gap is formed between the adjacent first convex portion and the second convex portion.
5. The squeeze film damper bearing of claim 4 wherein,
the dissipation part has:
a first protrusion flow path provided inside the first protrusion and through which the viscous fluid flows; and
and a second protrusion flow path provided inside the second protrusion, through which the viscous fluid flows.
6. The squeeze film damper bearing of claim 1 wherein,
the dissipation part is provided with:
a plurality of first inflow and outflow portions provided on an inner circumferential surface of the outer support ring, through which the viscous fluid flows in and out; and
and a first flow path provided along the circumferential direction inside the outer support ring, communicating with the first inflow/outflow portion, and through which the viscous fluid flows.
7. The squeeze film damper bearing of claim 6 wherein,
the dissipation unit further includes:
a plurality of second inflow/outflow portions provided on an outer peripheral surface of the inner support ring, through which the viscous fluid flows in and out; and
and a second flow path provided along a circumferential direction inside the inner support ring, communicating with the second inflow/outflow portion, and through which the viscous fluid flows.
8. A squeeze film damper bearing, wherein,
the squeeze film damper bearing has:
an inner support ring supporting the bearing portion;
an outer support ring disposed on an outer periphery of the inner support ring; and
a resistance member provided at an end surface of a damper gap formed between an outer peripheral surface of the inner support ring and an inner peripheral surface of the outer support ring,
the damper gap is filled with a viscous fluid.
9. The squeeze film damper bearing of claim 8 wherein,
the resistance member is formed in a mesh shape.
10. The squeeze film damper bearing of claim 8 wherein,
the resistance member partially covers the end face.
11. The squeeze film damper bearing of any one of claims 8-10 wherein,
the outer bearing ring has a groove extending in a direction towards the end face.
12. The squeeze film damper bearing of any one of claims 8-10 wherein,
the inner support ring has a plurality of partition plates on an outer circumferential surface.
13. The squeeze film damper bearing of claim 11 wherein,
the inner support ring has a plurality of partition plates on an outer circumferential surface.
14. A rotary machine, wherein,
the rotating machine is provided with:
the squeeze film damper bearing of any one of claims 1 to 10; and
and a rotating shaft rotatably supported by the squeeze film damper bearing.
15. A rotary machine, wherein,
the rotating machine is provided with:
the squeeze film damper bearing of claim 11; and
and a rotating shaft rotatably supported by the squeeze film damper bearing.
16. A rotary machine, wherein,
the rotating machine is provided with:
the squeeze film damper bearing of claim 12; and
and a rotating shaft rotatably supported by the squeeze film damper bearing.
17. A rotary machine, wherein,
the rotating machine is provided with:
the squeeze film damper bearing of claim 13; and
and a rotating shaft rotatably supported by the squeeze film damper bearing.
Technical Field
The present invention relates to a squeeze film damper bearing used for a rotary machine such as a compressor and a rotary machine provided with the squeeze film damper bearing.
Background
A radial bearing for supporting a rotating shaft is used in a rotary machine such as a compressor. As one of the radial bearings, there is a squeeze film damper bearing having a squeeze film damper. In a squeeze film damper bearing, a viscous fluid is introduced into a damper gap between an inner support ring supporting a bearing portion and an outer support ring disposed along the entire outer periphery of the inner support ring to form a fluid film, and a so-called squeeze effect is imparted to obtain higher damping than that of a normal bearing. As such a squeeze film damper bearing, a squeeze film damper bearing described in japanese patent application laid-open No. 2000-145768 is known.
In a rotary machine having a gear such as a gear compressor, since a load applied to a bearing portion is largely changed depending on a load state, if a damper gap is narrowed in order to obtain a necessary attenuation, there is a possibility that an inner support ring is brought into contact with an outer support ring. In order to prevent contact, it is considered to widen the damper gap of the bearing. However, in the squeeze film damper described in japanese patent application laid-open No. 2000-145768, when the damper gap is widened, the pressure generated by the fluid film is reduced, and the damping performance is reduced in an accelerated manner.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a squeeze film damper bearing with further improved damping performance, and a rotary machine including the squeeze film damper bearing.
A first aspect of the present invention is a squeeze film damper bearing, wherein the squeeze film damper bearing has: an inner support ring supporting the bearing portion; an outer support ring disposed on an outer periphery of the inner support ring; and a dissipating portion that is provided on at least one of the outer support ring and the inner support ring, dissipates vibration energy, and fills a damper gap formed between an outer circumferential surface of the inner support ring and an inner circumferential surface of the outer support ring with a viscous fluid.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotating shaft, the dissipation of the vibration energy is generated by the dissipation portion in addition to the squeezing effect of the fluid film, and therefore the damping effect can be improved. In addition, even when the damping effect by the squeezing effect is reduced due to widening of the damper gap, the reduction of the damping effect can be suppressed by the damping effect by dissipation of the vibration energy, and the stability of the rotating shaft system can be ensured.
According to a second aspect of the present invention, in the squeeze film damper bearing according to the first aspect, the dissipation portion may have one or more cavities in at least one of an inner peripheral surface of the outer support ring and an outer peripheral surface of the inner support ring.
With such a configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate along with the rotation of the rotating shaft, the viscous fluid moves in the axial direction or the circumferential direction, and a vortex is generated in the cavity, and viscous dissipation due to the vortex is generated, so that the vibration energy is dissipated. This can provide a damping effect by viscosity dissipation in addition to the conventional squeezing effect, and thus can improve the damping effect. In addition, even when the damping effect by the squeezing effect is reduced due to widening of the damper gap, the reduction of the damping effect can be suppressed by giving the damping effect by the viscosity dissipation, and the stability of the rotating shaft system can be ensured. Further, the attenuation effect can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the cavities.
According to a third aspect of the present invention, in the squeeze film damper bearing according to the first aspect, the dissipation portion may have one or more circumferential grooves in at least one of an inner circumferential surface of the outer support ring and an outer circumferential surface of the inner support ring.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotating shaft, the viscous fluid flows into the circumferential groove and generates a vortex. At this time, since viscous dissipation occurs, a damping effect can be obtained. This can provide a damping effect by viscosity dissipation in addition to the conventional squeezing effect, and thus can improve the damping effect. In addition, even when the damping effect by the squeezing effect is reduced due to widening of the damper gap, the reduction of the damping effect can be suppressed by giving the damping effect by the viscosity dissipation, and the stability of the rotating shaft system can be ensured. Further, the damping effect can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the circumferential grooves.
According to a fourth aspect of the present invention, in the squeeze film damper bearing according to the first aspect, the dissipation portion may include: one or more first protrusions provided on an inner circumferential surface of the outer support ring; and one or more second protrusions provided on an outer peripheral surface of the inner support ring, wherein the first protrusions and the second protrusions are alternately arranged in a predetermined direction, and a gap is formed between the adjacent first protrusions and second protrusions.
With this configuration, the first convex portions provided on the inner peripheral surface of the outer support ring and the second convex portions provided on the outer peripheral surface of the inner support ring are alternately arranged in a predetermined direction to form gaps, and resistance is generated when the viscous fluid flows through the gaps, whereby dissipation of vibration energy is increased, and thus the damping effect can be improved.
The attenuation effect can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the first convex portion and the second convex portion.
According to a fifth aspect of the present invention, in the squeeze film damper bearing according to the fourth aspect, the dissipation portion may include: a first protrusion flow path provided inside the first protrusion and through which the viscous fluid flows; and a second protrusion flow path provided inside the second protrusion, through which the viscous fluid flows.
With this configuration, when the viscous fluid moves in the damper gap along with the vibration of the inner support ring, the viscous fluid flows around the first convex portion or the second convex portion, and flows through the first convex portion flow path provided in the first convex portion and the second convex portion flow path provided in the second convex portion. In this case, since resistance is generated when the viscous fluid passes through the first convex flow path or the second convex flow path, dissipation of vibration energy is increased, and thus the damping effect can be further improved.
Further, the attenuation effect can be adjusted by adjusting the size, shape, arrangement, and the like of the first convex flow path or the second convex flow path.
According to a sixth aspect of the present invention, in the squeeze film damper bearing according to the first aspect, the dissipation portion may include: a plurality of first inflow and outflow portions provided on an inner circumferential surface of the outer support ring, through which the viscous fluid flows in and out; and a first flow path provided along the circumferential direction inside the outer support ring, communicating with the first inflow/outflow portion, and through which the viscous fluid flows.
With this configuration, when the viscous fluid moves in the damper gap along with the vibration of the inner support ring, the viscous fluid flows through the first flow path via the first inflow/outflow portion. In this case, since resistance is generated when the viscous fluid passes through the first flow path, dissipation of vibration energy is increased, and thus the damping effect can be improved.
According to a seventh aspect of the present invention, in the squeeze film damper bearing according to the sixth aspect, the dissipation portion may further include: a plurality of second inflow/outflow portions provided on an outer peripheral surface of the inner support ring, through which the viscous fluid flows in and out; and a second flow path provided along the circumferential direction inside the inner support ring, communicating with the second inflow/outflow portion, and through which the viscous fluid flows.
With this configuration, when the viscous fluid moves in the damper gap due to the vibration of the inner support ring, the viscous fluid flows through the second flow path via the second inflow/outflow portion. In this case, since resistance is generated when the viscous fluid passes through the second flow path, dissipation of vibration energy is increased, and thus the damping effect can be further improved.
An eighth aspect of the present invention is a squeeze film damper bearing, wherein the squeeze film damper bearing has: an inner support ring supporting the bearing portion; an outer support ring disposed on an outer periphery of the inner support ring; and a resistance member provided at an end surface of a damper gap formed between an outer peripheral surface of the inner support ring and an inner peripheral surface of the outer support ring, the damper gap being filled with a viscous fluid.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotary shaft and the viscous fluid is discharged from the damper gap, the resistance member serves as a resistance against the flow of the viscous fluid, thereby dissipating the vibration energy. Accordingly, in addition to the squeezing effect of the fluid film, the viscous fluid discharged from the damper gap functions as a damper against the vibration of the inner support ring, and therefore, the damping effect can be improved.
In addition, even when the damping effect by the squeezing effect is reduced due to the damper gap being widened, the damping effect by dissipation of the vibration energy can be imparted by the resistance member, so that the reduction of the damping effect is suppressed and the stability of the rotating shaft system is ensured.
According to a ninth aspect of the present invention, the resistance member of the squeeze film damper bearing of the eighth aspect may be formed in a net shape.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotary shaft and the viscous fluid is discharged from the damper gap, the resistance member serves as a resistance against the flow of the viscous fluid, thereby dissipating the vibration energy. Accordingly, in addition to the squeezing effect of the fluid film, the viscous fluid discharged from the damper gap functions as a damper against the vibration of the inner support ring, and therefore, the damping effect can be improved. In addition, the attenuation effect can be adjusted by adjusting the shape, roughness, size, and the like of the screen.
In addition, even when the damping effect by the squeezing effect is reduced due to widening of the damper gap, the reduction of the damping effect can be suppressed by the damping effect by dissipation of the vibration energy, and the stability of the rotating shaft system can be ensured.
According to a tenth aspect of the present invention, the resistance member of the squeeze film damper bearing of the eighth aspect may partially cover the end surface.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotary shaft and the viscous fluid is discharged from the damper gap, the flow of the damper gap can be throttled with a simple configuration to dissipate the vibration energy, and thus the damping effect can be improved.
According to an eleventh aspect of the present invention, it may be that the outer bearing ring of any one of the eighth to tenth aspects has a groove extending in a direction toward the end face.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotary shaft and the viscous fluid moves in the damper gap, the viscous fluid flows into the groove and flows in the extending direction of the groove, and a rectifying effect of promoting the flow of the viscous fluid in the direction toward the end face can be obtained. Therefore, the vibration energy can be efficiently dissipated, and the attenuation effect can be improved.
According to a twelfth aspect of the present invention, it may be that the inner support ring of any one of the eighth to eleventh aspects has a plurality of partition plates on an outer peripheral surface.
With this configuration, when the bearing portion and the inner support ring supporting the bearing portion vibrate with the rotation of the rotary shaft and the viscous fluid moves in the damper gap, the partition plate prevents the viscous fluid from moving in the circumferential direction, and the flow of the viscous fluid in the direction toward the end face of the damper gap can be promoted. Therefore, the vibration energy can be efficiently dissipated by the resistance member provided at the end surface of the damper gap, and the damping effect can be improved.
A rotating machine according to at least one aspect of the present invention includes: a squeeze film damper bearing according to any one of the first to twelfth aspects; and a rotating shaft rotatably supported by the squeeze film damper bearing.
With such a configuration, a rotary machine having the damping effect by the squeeze film damper bearing according to the first to thirteenth aspects can be obtained.
Effects of the invention
According to the present invention, it is possible to provide a squeeze film damper bearing with further improved damping performance, and a rotary machine including the squeeze film damper bearing.
Drawings
Fig. 1 is a sectional view showing a rotary machine according to a first embodiment of the present invention.
Fig. 2 is an axial sectional view showing a rotary machine according to a first embodiment of the present invention, and is a sectional view taken along line a-a of fig. 1.
Fig. 3 is a sectional view showing a squeeze film damper bearing according to a first embodiment of the present invention, and is a sectional view taken along line B-B of fig. 2.
Fig. 4 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the first embodiment of the present invention.
Fig. 5 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to a modification of the first embodiment of the present invention.
Fig. 6 is an axial cross-sectional view showing a rotary machine according to a second embodiment of the present invention.
Fig. 7 is a sectional view showing a squeeze film damper bearing according to a second embodiment of the present invention, and is a C-C sectional view of fig. 6.
Fig. 8 is a schematic view showing an inner peripheral surface of an outer support ring according to a second embodiment of the present invention.
Fig. 9 is an axial cross-sectional view showing a rotary machine according to a third embodiment of the present invention.
Fig. 10 is an enlarged view of a main part of a damper gap of a third embodiment of the present invention.
Fig. 11 is a schematic view showing a part of an inner peripheral surface of an outer support ring according to a third embodiment of the present invention.
Fig. 12 is a schematic view showing a part of an inner peripheral surface of an outer support ring according to a fourth embodiment of the present invention.
Fig. 13 is an enlarged view of a main part of a damper gap of a fourth embodiment of the present invention.
Fig. 14 is a schematic view showing a part of an inner peripheral surface of an outer support ring according to a fifth embodiment of the present invention.
Fig. 15 is an axial cross-sectional view showing a rotary machine according to a fifth embodiment of the present invention.
Fig. 16 is a sectional view showing a rotary machine according to a sixth embodiment of the present invention.
Fig. 17 is an axial sectional view showing a rotary machine according to a sixth embodiment of the present invention, and is a sectional view taken along line a-a of fig. 16.
Fig. 18 is a sectional view showing a squeeze film damper bearing according to a sixth embodiment of the present invention, and is a sectional view taken along line B-B of fig. 17.
Fig. 19 is a schematic diagram showing a resistance member according to a sixth embodiment of the present invention.
Fig. 20 is a schematic diagram showing a resistance member according to a modification of the sixth embodiment of the present invention.
Fig. 21 is a schematic diagram showing a resistance member according to a modification of the sixth embodiment of the present invention.
Fig. 22 is a sectional view showing a squeeze film damper bearing according to a seventh embodiment of the present invention.
Fig. 23 is an enlarged view of a main portion showing a damper gap of a seventh embodiment of the present invention.
Fig. 24 is an enlarged view of a main part showing a damper gap in a modification of the seventh embodiment of the present invention.
Fig. 25 is a sectional view showing a squeeze-film damper bearing according to an eighth embodiment of the present invention.
Fig. 26 is a schematic view showing a part of an inner peripheral surface of an outer support ring according to an eighth embodiment of the present invention.
Fig. 27A is a view showing the shape (triangular shape) of an axial groove in a modification of the eighth embodiment of the present invention.
Fig. 27B is a view showing the shape (circular shape) of an axial groove in a modification of the eighth embodiment of the present invention.
Fig. 28 is a schematic view showing a part of an inner peripheral surface of an outer support ring according to a modification of the eighth embodiment of the present invention.
Fig. 29 is an axial cross-sectional view showing a rotary machine according to a ninth embodiment of the present invention.
Fig. 30 is a sectional view showing a squeeze film damper bearing according to a ninth embodiment of the present invention, and is a sectional view taken along line C-C of fig. 29.
Fig. 31 is a schematic view showing one of rotary machines (gear compressors) to which a squeeze film damper bearing according to an embodiment of the present invention is applied.
Description of reference numerals:
1A, 1b.. rotary machine;
2 … rotating shaft;
3 … squeeze the oil film damper bearing;
4 … gear;
5 … impeller;
6 … drive shaft;
10 … bearing portion;
11 … bearing shells;
12 … bearing surfaces;
13 … pivot shaft;
20 … squeeze film dampers;
24 … inner support ring;
28 … outer support ring;
30 … damper clearance;
38 … oil film;
60 … circumferential grooves;
70 … a first protrusion;
72 … first lobe flow path;
74 … first outflow inflow;
a first inflow port;
76 … first flow path;
a first radial flow path;
76B … first circumferential flow path;
80 … a second protrusion;
82 … second lobe flow path;
84 … second inflow;
a second inflow port;
86 … second flow path;
a second radial flow path;
86B … second circumferential flow path;
90 … through holes;
95 … gap;
100 … cavities;
110 … bearing portion;
111 … bearing shells;
112 … bearing surfaces;
113 a
116 … squeeze the oil film damper;
120 … inner support ring;
122 … inner peripheral surface;
124 … inner peripheral surface;
126 … inboard end face;
130 … outer support ring;
134 … outer inner peripheral surface;
138 … outer end face;
140 … damper clearance;
142 … damper portion end face;
148 … oil film;
150 … wire mesh;
152 … wire;
154 … mesh;
156 … board;
158 … hole;
160 … end face component;
170 … axial slots;
180 … a divider plate;
o … center axis.
Detailed Description
(first embodiment)
A first embodiment of the present invention will be described below with reference to fig. 1 to 5 and 31. Fig. 1 is a sectional view showing a rotary machine according to the present embodiment. The rotary machine 1A is a compressor that pumps a fluid, and is, for example, a gear compressor that supports a rotary shaft coupled via a gear using a squeeze film damper bearing. As shown in fig. 1, the rotary machine 1A includes a
Fig. 31 is a schematic view showing a gear compressor to which a squeeze film damper bearing according to the present embodiment is applied. In this gear compressor, a pair of impellers 5 are housed in a casing, not shown, and a
The
The squeeze film damper bearing 3 includes a bearing
The
The
The
The
Next, the
Next, the operation of the squeeze film damper bearing 3 of the present embodiment will be described. In a state where the
Further, according to the squeeze film damper bearing 3 of the present embodiment, when the bearing
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the conventional squeeze effect, the vibration energy is dissipated by generating the viscous dissipation in the hollow 100, and therefore the damping effect can be improved.
Even when the damping effect by the squeezing effect is reduced by widening the
The attenuation effect can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the
Although the first embodiment of the present invention has been described above with reference to the drawings, for example, the
(second embodiment)
Next, a second embodiment of the present invention will be described with reference to fig. 6 to 8. Fig. 6 is an axial cross-sectional view showing the rotary machine according to the present embodiment. Fig. 7 is a sectional view showing the squeeze film damper bearing of the present embodiment, and is a C-C sectional view of fig. 6. Fig. 8 is a schematic view showing an inner peripheral surface of the outer support ring according to the present embodiment. The same components as those of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The present embodiment is different from the first embodiment in that a
Next, the operation of the squeeze film damper bearing 3 of the present embodiment will be described. When the bearing
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the conventional squeeze effect, vibration energy is dissipated by generating viscous dissipation in the
Even when the damping effect by the squeezing effect is reduced by widening the
The damping effect can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the
While the second embodiment of the present invention has been described above, for example, the location where the
(third embodiment)
A third embodiment of the present invention will be described below with reference to fig. 9 to 11. Fig. 9 is an axial cross-sectional view showing the rotary machine according to the present embodiment. Fig. 10 is an enlarged view of a main part of the damper gap of the present embodiment. Fig. 11 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the present embodiment. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, the difference from the above-described embodiments is that a
As shown in fig. 9 and 10, the first
The
The size, shape, number, arrangement interval, and the like of the first
According to the structure of the present embodiment, the
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the damping effect by the conventional squeeze effect, the damping effect can be improved by increasing the dissipation of the vibration energy generated between the oil and the
In addition, when the first
The damping performance can be adjusted by adjusting the size, shape, number, arrangement interval, and the like of the first
Although the third embodiment of the present invention has been described above, for example, the first
(fourth embodiment)
A fourth embodiment of the present invention will be described below with reference to fig. 12 and 13. Fig. 12 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the present embodiment. Fig. 13 is an enlarged view of a main part of the damper gap in the present embodiment. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. The present embodiment differs from the third embodiment in that a first
According to the configuration of the present embodiment, when the bearing
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the damping effect by the conventional squeeze effect, the damping effect can be improved by increasing the dissipation of the vibration energy generated between the oil and the first
In addition, in the case where the first
Further, the damping performance can be adjusted by adjusting the size, shape, arrangement, and the like of the first
Although the fourth embodiment of the present invention has been described above, for example, the first
(fifth embodiment)
A fifth embodiment of the present invention will be described below with reference to fig. 14 and 15. Fig. 14 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the present embodiment. Fig. 15 is an axial cross-sectional view showing the rotary machine according to the present embodiment. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. In the present embodiment, a plurality of first inflow and
The first inflow/
The
The first
The method of machining the
The second inflow/
The
The second
The method of machining the
According to the configuration of the present embodiment, when the bearing
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the damping effect by the conventional squeeze effect, the damping effect can be improved by generating dissipation of vibration energy between the oil and the
In addition, when the
While the fifth embodiment of the present invention has been described above, for example, it is not necessary to provide the first inflow/
(sixth embodiment)
A sixth embodiment of the present invention will be described below with reference to fig. 16 to 21. Fig. 16 is a sectional view showing a rotary machine according to the present embodiment. As shown in fig. 16, the
The
The squeeze film damper bearing 3 includes a bearing
The
The
The
The oil film 148 is formed by introducing viscous oil into the damper gap 140, and its radial thickness is changed by the radial displacement of the
Next, the
As an example, the resistance member is a
Next, the operation of the squeeze film damper bearing 3 of the present embodiment will be described. In a state where the oil film 148 is formed in the damper gap 140, for example, when the
Further, according to the squeeze film damper bearing 3 of the present embodiment, the
Therefore, according to the squeeze film damper bearing 3 of the present embodiment, in addition to the conventional squeeze effect, the oil discharged from the damper gap 140 functions as a damper against the vibration of the
Even when the damping effect by the squeezing effect is reduced by widening the damper gap 140 of the
Although the sixth embodiment of the present invention has been described above with reference to the drawings, the
(seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to fig. 22 to 24. Fig. 22 is a sectional view showing a squeeze film damper bearing of the present embodiment. Fig. 23 is an enlarged view of a main portion showing the damper gap of the present embodiment. Fig. 24 is an enlarged view of a main portion showing a damper gap in a modification of the present embodiment. The same components as those of the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The present embodiment is different from the sixth embodiment in that
According to the above configuration, when the bearing
Even when the damping effect by the squeezing effect is reduced by widening the damper gap 140 of the
Although the seventh embodiment of the present invention has been described above, for example, the
(eighth embodiment)
An eighth embodiment of the present invention will be described below with reference to fig. 25 to 28. Fig. 25 is a sectional view showing a squeeze film damper bearing of the present embodiment. Fig. 26 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the present embodiment. Fig. 27A and 27B are views showing the shape of the axial grooves in the modification of the present embodiment. Fig. 28 is a schematic view showing a part of the inner peripheral surface of the outer support ring according to the modification of the present embodiment. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. As shown in fig. 25, the present embodiment differs from the above-described embodiments in that an
As shown in fig. 26, the
According to the above configuration, when the bearing
While the eighth embodiment of the present invention has been described above, for example, the sectional shape of the
(ninth embodiment)
A ninth embodiment of the present invention will be described below with reference to fig. 29 and 30. Fig. 29 is an axial cross-sectional view showing the rotary machine according to the present embodiment. Fig. 30 is a sectional view showing the squeeze film damper bearing of the present embodiment, and is a sectional view taken along line C-C of fig. 29. The same components as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted. The present embodiment is different from the eighth embodiment in that a
According to the above configuration, when the bearing
While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and design changes and the like are included within the scope not departing from the gist of the present invention. For example, the bearing to which the first to ninth embodiments are applied is not limited to a compressor, and may be a gas turbine, a steam turbine, or the like in which a rotor blade receives a fluid force from a working fluid to rotate a rotating shaft. In addition, various bearing systems can be applied to the bearing portion. For example, an annular bushing is also possible. The inner support ring and the outer support ring may be split ring structures that are divided vertically.
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