WO2023210014A1 - 軸受装置 - Google Patents

軸受装置 Download PDF

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Publication number
WO2023210014A1
WO2023210014A1 PCT/JP2022/019456 JP2022019456W WO2023210014A1 WO 2023210014 A1 WO2023210014 A1 WO 2023210014A1 JP 2022019456 W JP2022019456 W JP 2022019456W WO 2023210014 A1 WO2023210014 A1 WO 2023210014A1
Authority
WO
WIPO (PCT)
Prior art keywords
collar
bearing
thrust bearing
rotating shaft
thrust
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2022/019456
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
純 吉田
強 高橋
達也 蓮仏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tokico System Solutions Co Ltd
Original Assignee
Tokico System Solutions Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tokico System Solutions Co Ltd filed Critical Tokico System Solutions Co Ltd
Priority to JP2024517817A priority Critical patent/JP7746553B2/ja
Priority to PCT/JP2022/019456 priority patent/WO2023210014A1/ja
Publication of WO2023210014A1 publication Critical patent/WO2023210014A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/06—Bearings not otherwise provided for with moving member supported by a fluid cushion formed, at least to a large extent, otherwise than by movement of the shaft, e.g. hydrostatic air-cushion bearings

Definitions

  • the present disclosure relates to a bearing device.
  • Patent Document 1 discloses that a hydrodynamic gas bearing is used to support a thrust load on a rotating shaft of an expansion turbine.
  • a bearing that supports the thrust load on the rotating shaft is arranged so as to face a disk-shaped collar provided on the rotating shaft in an axial direction parallel to the rotating shaft (hereinafter simply referred to as the "axial direction"). (See Figure 4 below).
  • the rotating shaft may run out due to sudden changes in process conditions. Furthermore, for example, abnormal vibrations may occur in the rotating shaft. Therefore, the rotating shaft tilts due to vibration or vibration of the rotating shaft, and as a result, the outer circumferential portion of the collar and the bearing may come into contact with each other, which may cause seizure.
  • a disc-shaped collar provided on a rotating shaft and centered on the rotating shaft; a thrust bearing arranged to face the collar in an axial direction along the rotation axis, The opposing surface of the collar with respect to the thrust bearing has an inclined portion that is inclined outward in a radial direction with respect to the rotation axis so that the distance from the thrust bearing increases.
  • a bearing device is provided.
  • FIG. 3 is a diagram showing a first example of the structure of a bearing device. It is a figure which shows the 2nd example of the structure of a bearing device. It is a diagram showing an example of the configuration of a hydrogen gas filling system.
  • FIG. 7 is a diagram showing a bearing device according to a comparative example.
  • FIG. 1 is a diagram showing a first example of the structure of the bearing device 10.
  • the vertical direction in the figure corresponds to the vertical direction. Further, in the figure, only a portion (the housing 11 and the thrust bearing 14) is shown as a cross-sectional view. The same applies to FIG. 2, which will be described later.
  • the bearing device 10 supports a radial load and a thrust load on a rotating shaft 20 that rotates at high speed.
  • the rotating shaft 20 is installed to extend in the vertical direction. Further, the rotating shaft 20 may be arranged to extend in the horizontal direction.
  • An impeller 30 of an expansion turbine (see FIG. 3) that expands the process gas is attached to one end (lower end in this example) of the rotating shaft 20.
  • the process gas is, for example, hydrogen gas (see FIG. 4). Further, the process gas may be helium gas, nitrogen gas, or air.
  • An energy consumption section 40 is attached to the other end (in this example, the upper end) of the rotating shaft 20.
  • the energy consumption unit 40 can consume the rotational energy of the rotating shaft 20 driven by the process gas.
  • the energy consumption unit 40 is, for example, an impeller of a compressor (see FIG. 4). Further, the energy consumption section 40 may be a brake fan for braking or a generator.
  • rotating shaft 20 may be vertically reversed.
  • the bearing device 10 includes a housing 11, a radial bearing 12, a collar 13, and a thrust bearing 14.
  • the housing 11 accommodates a radial bearing 12, a collar 13, and a thrust bearing 14 inside.
  • the rotating shaft 20 passes through the housing 11 in the vertical direction, and the impeller 30 is attached to one end (lower end) of the rotating shaft 20 exposed from one end (lower end) of the housing 11.
  • the energy consumption part 40 is attached to the other end (upper limit) of the rotating shaft 20 exposed from the upper limit.
  • the radial bearing 12 supports the radial load on the rotating shaft 20.
  • the radial bearing 12 is a hydrodynamic gas bearing.
  • radial bearing 12 is a tilting pad gas bearing.
  • the radial bearing 12 may be a perfect circular gas bearing or a foil gas bearing.
  • two radial bearings 12 are provided, and each is arranged at both ends in the axial direction inside the housing 11.
  • the collar 13 is attached to the rotating shaft 20 and has a disk shape centered on the rotating shaft 20.
  • the collar 13 is provided inside the housing 11 at the center in the axial direction.
  • the collar 13 is configured to be able to receive a reaction force (hereinafter referred to as "thrust reaction force”) generated by the thrust bearing 14 against the thrust load of the rotating shaft 20.
  • thrust reaction force a reaction force generated by the thrust bearing 14 against the thrust load of the rotating shaft 20.
  • the thrust bearing 14 supports the thrust load on the rotating shaft 20. Specifically, the thrust bearing 14 generates a thrust reaction force against the collar 13.
  • the thrust bearing 14 is arranged to face the collar 13 in the axial direction.
  • two thrust bearings 14 are provided, and each thrust bearing 14 is arranged adjacent to both one end (lower end) side and the other end (upper end) side of the rotating shaft 20 when viewed from the collar 13. be done.
  • the thrust bearing 14 is a hydrostatic gas bearing.
  • the thrust bearing 14 has an injection hole 14A that injects a predetermined gas toward the collar 13.
  • the injection holes 14A are provided at predetermined intervals in the circumferential direction (hereinafter simply referred to as the "circumferential direction") with respect to the rotating shaft 20 of the thrust bearing 14.
  • the injection hole 14A communicates with a gas supply path 14B connected to the outside of the housing 11, and a predetermined gas is supplied from the outside to the injection hole 14A.
  • the predetermined gas is, for example, the same gas as the process gas introduced into the expansion turbine including the impeller 30.
  • the process gas before being introduced into the expansion turbine including the impeller 30 is branched and introduced into the gas supply path 14B.
  • the predetermined gas may be a gas dedicated to the thrust bearing 14 that is different from the process gas introduced into the expansion turbine including the impeller 30.
  • the thrust bearing 14 may be a dynamic pressure type gas bearing that supports the thrust load of the rotating shaft 20 by the gas film pressure between the thrust bearing 14 and the collar 13 . In this case, the injection hole 14A is omitted. Further, the thrust bearing 14 may have a combination of both a dynamic pressure type and a static pressure type configuration.
  • the injection hole 14A (an example of an injection section) is provided on the surface of the thrust bearing 14 facing the collar 13, and is formed so that the injection direction of the predetermined gas is in the axial direction. Thereby, a thrust reaction force can be generated in the collar 13 by the predetermined gas injected from the injection hole 14A. Furthermore, even if, for example, the rotating shaft 20 is tilted due to vibration or vibration of the rotating shaft 20 and the collar 13 approaches the thrust bearing 14, the tilt of the rotating shaft 20 will increase due to the action of the predetermined gas that is injected. It is possible to suppress abnormal approach caused by the collision of the collar 13 and the thrust bearing 14, and to suppress contact between the collar 13 and the thrust bearing 14.
  • the gas injected from the injection hole 14A may be released to the atmosphere or may be recovered. In the latter case, the recovered gas may be returned to the gas path before being introduced into the expansion turbine.
  • the opposing surface of the collar 13 with respect to the thrust bearing 14 has an inclined surface configured such that the distance from the thrust bearing 14 increases toward the outside in the radial direction (hereinafter simply referred to as the "radial direction") with respect to the rotating shaft 20.
  • a section 13A is provided.
  • the surface of the thrust bearing 14 facing the collar 13 is configured as a surface perpendicular to the rotating shaft 20, that is, a horizontal surface.
  • the inclined portion 13A is inclined from the center in the radial direction toward the outer side in the radial direction at a constant inclination so as to be away from the opposing surface (horizontal surface) of the thrust bearing 14.
  • the angle of inclination of the inclined portion 13A with respect to a predetermined reference is set based on the maximum inclination angle defined for the radial bearing 12, for example.
  • the inclination angle of the inclination portion 13A is such that when the rotating shaft 20 is inclined corresponding to the maximum inclination angle of the radial bearing 12, the radially outer end of the collar 13 comes into contact with the thrust bearing 14. It is set to be smaller within the range where it is not.
  • FIG. 2 is a diagram showing a second example of the structure of the bearing device 10.
  • the bearing device 10 includes a housing 11, a radial bearing 12, a collar 13, and a thrust bearing 14, as in the first example described above.
  • the collar 13 has an inclined portion 13A as in the first example described above.
  • the inclined portion 13A is provided only at a portion of the surface of the collar 13 facing the thrust bearing 14 that is radially outer than the radial position where the injection hole 14A of the thrust bearing 14 is provided. Specifically, the inclined portion 13A extends from a predetermined starting position radially outward of the radial position where the injection hole 14A of the thrust bearing 14 is provided to the end of the collar 13 radially outward. It is inclined radially outward and away from the thrust bearing 14. On the other hand, a portion of the surface of the collar 13 facing the thrust bearing 14 that is radially inner than the starting position of the inclined portion 13A is a horizontal surface, and the distance from the thrust bearing 14 is maintained constant.
  • the distance between the injection hole 14A and the collar 13 can be maintained relatively small while ensuring a relatively large distance between the radially outer end of the collar 13 and the thrust bearing 14. Therefore, by the action of the predetermined gas injected from the injection hole 14A, the thrust reaction force can be applied to the collar 13 more appropriately, and the approach of the collar 13 to the thrust bearing 14 due to the inclination of the rotating shaft 20 can be prevented. It can be suppressed more appropriately.
  • the inclined portion 13A may be provided only on a part of the surface of the collar 13 facing the thrust bearing 14 in the radial direction, similarly to the second example described above.
  • the inclined portion 13A thrusts toward the outside in the radial direction between the radial center portion and a predetermined end position inside the radially outer end. It may be inclined away from the bearing 14.
  • a portion of the surface of the collar 13 facing the thrust bearing 14 that is radially outer than the end position of the inclined portion 13A is a horizontal surface, and the distance from the thrust bearing 14 may be maintained constant.
  • the inclined portion 13A extends toward the outside in the radial direction from the predetermined radial start position to the predetermined end position inside the radial outer end. It may be inclined away from 14.
  • a portion of the surface of the collar 13 facing the thrust bearing 14 that is radially outer than the end position of the inclined portion 13A is a horizontal surface, and the distance from the thrust bearing 14 may be maintained constant.
  • the degree of inclination (inclination angle) of the inclined portion 13A may change continuously or stepwise in the radial direction.
  • FIG. 3 is a diagram showing an example of application of the bearing device 10. Specifically, FIG. 3 is a diagram showing an example of the hydrogen gas filling system 1. As shown in FIG.
  • the hydrogen gas filling system 1 is installed, for example, at a hydrogen station for filling a vehicle VCL with hydrogen gas.
  • FIG. 3 it includes a hydrogen gas compression equipment 100, an expansion valve 200, a hydrogen gas line 300, and a pre-cool system 400.
  • the hydrogen gas compression equipment 100 compresses hydrogen gas supplied from a tank, increases the pressure to a predetermined pressure, and outputs it.
  • the expansion valve 200 adiabatically expands (isenthalpic expands) the hydrogen gas output from the hydrogen gas compression equipment 100. At this time, since the temperature of the hydrogen gas before expansion is higher than the inversion temperature (-58° C.), the temperature of the hydrogen gas after expansion increases due to the Joule-Thomson effect.
  • the hydrogen gas line 300 supplies expanded hydrogen gas output from the expansion valve 200 to the pre-cool system 400.
  • the pre-cool system 400 cools hydrogen gas supplied from the hydrogen gas line 300 and supplies it to the dispenser 500.
  • Pre-cool system 400 includes a compressor 410, a cooler 420, a cold source 430, and an expansion turbine 440.
  • the compressor 410 compresses hydrogen gas supplied from the hydrogen gas line 300.
  • the cooler 420 cools the hydrogen gas by exchanging heat between the refrigerant supplied from the cold source 430 and the hydrogen gas compressed by the compressor 410.
  • the cold heat source 430 supplies and circulates a refrigerant having a lower temperature than the hydrogen gas output from the compressor 410 to the cooler 420.
  • a cooler similar to the cooler 420 may be provided upstream of the compressor 410, and the hydrogen gas in the hydrogen gas line 300 may be introduced into the compressor 410 after being cooled by the cooler.
  • the expansion turbine 440 expands the hydrogen gas cooled by the cooler 420. Thereby, the hydrogen gas can be expanded and the temperature of the hydrogen gas can be lowered. Further, by expanding the hydrogen gas compressed by the compressor 410, the expansion ratio becomes relatively large, and as a result, the temperature of the hydrogen gas can be lowered to a greater extent. Therefore, for example, the temperature of hydrogen gas can be lowered to an appropriate level without requiring a pre-cool system that requires refrigerator equipment including a compressor, condenser, expansion valve, evaporator, accumulator, etc.
  • the compressor 410 and the expansion turbine 440 are connected by the rotating shaft 20 supported by the bearing device 10.
  • the expansion turbine 440 expands hydrogen gas using an impeller 30 attached to one end of the rotating shaft 20, while the compressor 410 expands hydrogen gas using an impeller serving as an energy consumption section 40 attached to the other end of the rotating shaft 20. Compress it.
  • the collar 13 of the bearing device 10 and the thrust bearing 14 contact can be suppressed. Therefore, it is possible to suppress a situation where the compressor 410 and the expansion turbine 440 need to be stopped or replaced due to seizure due to contact between the collar 13 and the thrust bearing 14, and the operation of the hydrogen station is affected. be able to.
  • the dispenser 500 fills the hydrogen tank TNK of the vehicle VCL with hydrogen gas supplied from the pre-cool system 400 under high pressure.
  • the vehicle VCL is, for example, a fuel cell vehicle equipped with a fuel cell capable of generating electricity using hydrogen gas as fuel.
  • the bearing device 10 can be applied to the compressor 410 and expansion turbine 440 of the pre-cool system 400 in the hydrogen gas filling system 1.
  • FIG. 4 is a diagram showing a bearing device 10c according to a comparative example.
  • the bearing device 10c includes a housing 11, a radial bearing 12, a collar 13c, and a thrust bearing 14.
  • the collar 13c is configured to receive thrust reaction force generated by the thrust bearing 14 against the thrust load of the rotating shaft 20.
  • the surface of the collar 13c facing the thrust bearing 14 is a horizontal surface, and the distance between the collar 13c and the thrust bearing 14 is maintained constant. Therefore, for example, if the rotating shaft 20 is tilted due to vibration or vibration of the rotating shaft 20, the radially outer end of the collar 13 may approach and come into contact with the thrust bearing 14. As a result, the collar 13 and the thrust bearing 14 may seize, and the compression turbine including the impeller 30 may need to be stopped, or the components may need to be replaced because they cannot be restarted.
  • the bearing device 10 is provided on the rotating shaft 20, and includes a disc-shaped collar 13 centered on the rotating shaft 20, and a disc-shaped collar 13 that faces the collar 13 in the axial direction along the rotating shaft 20.
  • a thrust bearing 14 is provided.
  • the facing surface of the collar 13 with respect to the thrust bearing 14 has an inclined portion 13A that is inclined so that the distance from the thrust bearing 14 increases toward the outside in the radial direction with respect to the rotating shaft 20.
  • the thrust bearing 14 may be provided with an injection hole 14A that injects gas toward the collar 13.
  • the inclined portion 13A may be formed on the collar 13 on the outer side in the radial direction than the position facing the injection hole 14A in the axial direction.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Rolling Contact Bearings (AREA)
  • Sliding-Contact Bearings (AREA)
PCT/JP2022/019456 2022-04-28 2022-04-28 軸受装置 Ceased WO2023210014A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2024517817A JP7746553B2 (ja) 2022-04-28 2022-04-28 軸受装置
PCT/JP2022/019456 WO2023210014A1 (ja) 2022-04-28 2022-04-28 軸受装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2022/019456 WO2023210014A1 (ja) 2022-04-28 2022-04-28 軸受装置

Publications (1)

Publication Number Publication Date
WO2023210014A1 true WO2023210014A1 (ja) 2023-11-02

Family

ID=88518259

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2022/019456 Ceased WO2023210014A1 (ja) 2022-04-28 2022-04-28 軸受装置

Country Status (2)

Country Link
JP (1) JP7746553B2 (enrdf_load_stackoverflow)
WO (1) WO2023210014A1 (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4888346A (enrdf_load_stackoverflow) * 1972-03-06 1973-11-19
JPH0523936A (ja) * 1991-07-17 1993-02-02 Toshiba Mach Co Ltd 静圧テーブル装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4888346A (enrdf_load_stackoverflow) * 1972-03-06 1973-11-19
JPH0523936A (ja) * 1991-07-17 1993-02-02 Toshiba Mach Co Ltd 静圧テーブル装置

Also Published As

Publication number Publication date
JP7746553B2 (ja) 2025-09-30
JPWO2023210014A1 (enrdf_load_stackoverflow) 2023-11-02

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