WO2020059972A1

WO2020059972A1 - Gas foil bearing and fluid machine including same

Info

Publication number: WO2020059972A1
Application number: PCT/KR2019/000024
Authority: WO
Inventors: 최종원
Original assignee: 한화파워시스템 주식회사
Priority date: 2018-09-21
Filing date: 2019-01-02
Publication date: 2020-03-26
Also published as: KR20200034493A; KR102659634B1

Abstract

The present invention relates to a gas foil bearing and a fluid machine including the gas foil bearing. The present invention comprises a base plate, a plurality of bump foils arranged on one surface of the base plate, and a plurality of land plates arranged to respectively cover the bump foils, wherein the base plate comprises a plurality of elastic pieces which protrude outward from the other surface thereof and are disposed between the neighboring bump foils.

Description

Gas foil bearing and fluid machine containing same

The present invention relates to a device, and more particularly to a gas foil bearing and a fluid machine comprising the same.

Typically, a gas foil bearing can be applied to support the rotator in the axial or radial direction. This gas foil bearing is not a method of supporting a shaft using an oil film like a conventional ball bearing or journal bearing, but a bearing supporting a shaft by forming a high pressure air layer between the gas foil and the shaft.

Gas foil bearings are particularly effective for supporting rotating bodies that rotate at high speeds. For example, the gas foil bearing can be applied to a turbo compressor of a gas turbine engine or the like. Since gas turbine engines require compressed air for combustion of fuel, a turbo compressor for compressing air is provided. Air compressed in a turbo compressor is mainly used for combustion of fuel, but since some compressed air can be supplied to the gas foil bearing, the impeller shaft of the turbo compressor or the rotating shaft of the gas turbine engine can be supported by the gas foil bearing.

Korean Patent No. 10-0365806 discloses a gas foil bearing with improved rigidity.

SUMMARY Embodiments of the present invention are to provide a gas foil bearing having a preload, improved durability and driveability, and a fluid machine including the same.

An aspect of the present invention includes a base plate, a bump foil disposed in plural on one surface of the base plate, and a plurality of land plates disposed to cover the bump foil, respectively, wherein the base plate It provides a gas foil bearing having a plurality of elastic pieces that are projected outward from the other surface and disposed between the adjacent bump foils.

In the embodiments of the present invention, the gas foil bearing can stably drive the fluid machine, and increase the durability of the fluid machine. Since the gas foil bearing has a pre-load, it is possible to reduce damage between rotating parts and fixed parts of the fluid machine. In addition, when the fluid machine is driven, it is possible to improve rotation efficiency by creating an allowable gap between the rotating part and the fixed part.

1 is a plan view of a gas foil bearing according to an embodiment of the present invention.

FIG. 2 is a plan view showing the base plate and bump foil of FIG. 1.

3 is a cross-sectional view taken along III-III of FIG. 1.

4 is a cross-sectional view showing the fluid machine in which the gas foil bearing of FIG. 1 is installed.

5 is an enlarged view of region A of FIG. 4.

6A is a cross-sectional view showing a state in which the gas foil bearing of FIG. 1 is installed, and FIG. 6B is a cross-sectional view showing a state in which the gas foil bearing of FIG. 1 is driven from one side.

7A is a cross-sectional view showing the state in which the gas foil bearing of FIG. 1 is installed from another side, and FIG. 7B is a cross-sectional view showing the driving state of the gas foil bearing in FIG. 1 from the other side.

8 is an exploded perspective view showing a part of a gas foil bearing according to another embodiment of the present invention.

9 is a cross-sectional view showing a driving state of the gas foil bearing of FIG. 8.

In addition, the elastic piece may be formed by cutting in the base plate.

In addition, one side of the land plate is fixed to one side of the base plate and extends to the other side, and the bump foil is fixed to one side of the base plate and extends along the land plate, and the elastic piece is one side of the base plate. Direction.

In addition, the elastic piece may be disposed in an area where the bump foil and the base plate do not overlap among the base plates.

Further, the land plate and the elastic piece may extend in a first direction along the base plate, and the bump foil may extend along a second direction opposite to the first direction along the base plate.

In addition, the elastic piece may be arranged radially along the base plate.

In addition, the base plate may have a joint portion having an elastic member disposed between the external structure and the other surface of the base plate.

Another aspect of the present invention, a rotatable rotor, an impeller assembly installed at the end of the rotor, a disk extending from the outer peripheral surface of the rotor in a radial direction, spaced apart from the impeller assembly in the longitudinal direction of the rotor, and A housing disposed to surround the disk while having a predetermined distance from the disk, and a base plate interposed between the disk and the housing and disposed to face the housing or the disk, and outward from the base plate A fluid machine comprising a gas foil bearing having a protruding elastic piece.

In addition, if the rotor does not rotate, the elastic piece separates the base plate from the housing or the disk, and when the rotor rotates, the fluid discharged from the impeller assembly presses the gas foil bearing to press the base plate. It can be brought into contact with the housing or the disc.

In addition, the gas foil bearing includes a bump foil disposed in plural on one surface of the base plate, and a plurality of land plates disposed to cover the bump foil, respectively, and the elastic piece of the base plate It protrudes outward from the other surface and may be disposed between the adjacent bump foils.

In addition, one side of the land plate is fixed to one side of the base plate and extends to the other side, and the bump foil is fixed to one side of the base plate corresponding to the other side of the land plate and extends to one side of the land plate, and the In the elastic piece, a portion connected to the base plate is disposed adjacent to one side of the base plate and may extend to the other side of the base plate.

In addition, the base plate may include a joint portion having an elastic member disposed between the disk or the housing and the other surface of the base plate.

The present invention will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and the ordinary knowledge in the technical field to which the present invention pertains. It is provided to fully inform the holder of the scope of the invention, and the invention is only defined by the scope of the claims. Meanwhile, the terms used in the present specification are for explaining the embodiments and are not intended to limit the present invention. In this specification, the singular form also includes the plural form unless otherwise specified in the phrase. As used herein, "comprises" and / or "comprising" refers to the components, steps, operations and / or elements mentioned above, the presence of one or more other components, steps, operations and / or elements. Or do not exclude additions. Terms such as first and second may be used to describe various components, but the components should not be limited by terms. The terms are used only to distinguish one component from other components.

1 is a plan view of a gas foil bearing 100 according to an embodiment of the present invention, FIG. 2 is a plan view showing the base plate 110 and bump foil 120 of FIG. 1, and FIG. It is a sectional view taken along Ⅲ-Ⅲ.

1 to 3, the gas foil bearing 100 may include a base plate 110, a bump foil 120 and a land plate 130.

The base plate 110 has an opening in which a rotor is inserted in the center, and may have an annular plate shape. A joint portion 140 is installed in a plurality of coupling grooves 111 on the outside of the base plate 110 so that the base plate 110 can be fixed to an external structure such as a rotating disk of a rotor or a housing of a fluid machine.

The bump foil 120 is fixed to one surface of the base plate 110, and an elastic piece 115 is formed on the other surface. The elastic piece 115 is formed by cutting in the base plate 110 and is bent to protrude outward from the other surface of the base plate 110. The elastic piece 115 forms a preload on the gas foil bearing 100 by elasticity. By the pre-load, the gas foil bearing 100 is interposed between the rotating part and the fixed part when the fluid machine is not driven, and when driven, moves the base plate 110 up and down in the height direction to rotate between the rotating part and the fixed part. Can form gaps.

A plurality of bump foils 120 are disposed on one surface of the base plate 110. The bump foil 120 may be disposed radially while maintaining a predetermined interval. The bump foil 120 is disposed between the base plate 110 and the land plate 130. The bump foil 120 may include a connector 121 fixed to the base plate 110 and a plurality of bumps extending from the connector 121 and being curved. Hereinafter, for convenience of description, a description will be given focusing on the case where three bumps are arranged side by side in the radial direction.

The first bump 122 is disposed inside the base plate 110, and the first convex portion 122a convex to contact the land plate 130 and the first concave portion contacting one surface of the base plate 110 ( 122b). The second bump 123 is disposed adjacent to the first bump 122, and the second convex portion 123a convex to contact the land plate 130 and the second concave portion contacting one surface of the base plate 110 (123b) may be provided. In addition, the third bump 124 is disposed adjacent to the second bump 123, the third convex portion 124a convex to contact the land plate 130 and the third contacting one surface of the base plate 110 A recess 124b may be provided.

Slots 125 are disposed between neighboring bumps. Specifically, the first slot 125a is disposed between the first bump 122 and the second bump 123, and the second slot 125b is disposed between the second bump 123 and the third bump 124. It can be arranged to form an independent elastic force to each bump.

In the bump foil 120, the third bump 124 disposed on the outer side in the radial direction is the longest, and the first bump 122 disposed on the inner side in the radial direction may have the shortest length. for example. The lengths of the first bump 122, the second bump 123, and the third bump 124 may increase in order. In FIG. 2, the first bump 122 has one first convex portion 122a, the second bump 123 has two second convex portions 123a, and the third bump 124 has three It may have a third convex portion (124a). However, the present invention is not limited thereto, and the first bump 122, the second bump 123, and the third bump 124 may have various set lengths depending on the installation location of the bump foil 120.

2, the first bump 122, the second bump 123 and the third bump 124 are formed to have a step, but the gas foil bearing 100 of the present invention is not limited thereto, and may have a fan shape. have.

The land plates 130 are arranged to cover the bump foils 120, respectively. The land plate 130 is disposed corresponding to each bump foil. One side 130a of the land plate 130 may have a fixing part 131 fixed to the base plate 110, and may have a landing part 132 extending from the fixing part 131. The fixing part 131 is fixed to the base plate 110 by a method such as welding. The other side 130b of the land plate 130 extends toward the connector 121 of the bump foil 120. The other side 130b of the land plate 130 is disposed on the top of the connector 121 and is arranged to be in contact with the bump foil 120.

Land plate 130 is one side (130a) is fixed to one surface on the base plate 110 and extends to the other side (130b), the bump foil 120 is the base corresponding to the other side (130b) of the land plate (130) One surface of the plate 110 is fixed and extends to one side 130a of the land plate 130. In another embodiment, the bump foil 120 may be fixed to one surface of the base plate 110 corresponding to one side 130a of the land plate 130 and extended to the other side 130a of the land plate 130. .

In the elastic piece 115, a portion connected to the base plate 110 is disposed adjacent to one side of the base plate 110 and extends to the other side of the base plate 110. That is, the elastic piece 115 extends in the same direction as the land plate 130. In FIG. 1, the land plate 130 and the elastic piece 115 extend counterclockwise, but the bump foil 120 extends clockwise.

In addition, in another embodiment, the elastic piece 115 has a portion connected to the base plate 110 disposed adjacent to the other side of the base plate 110 and extends to one side of the base plate 110. In another embodiment, the elastic piece 115 may extend in the radial direction of the base plate 110.

When the gas foil bearing 100 is driven, the fluid moves from one side of the land plate 130 toward the other side. Since the extension direction of the elastic piece 115 is the same as the extension direction of the land plate 130, that is, the elastic piece 115 is disposed in the same direction as the flow direction of the fluid, the fluid is elastic when the land plate 130 is pressed. The end of the piece 115 is quickly and gently compressed so that the base plate 110 can be supported on the external structure.

In addition, since the elastic piece 115 extends adjacent at one side of the base plate 110 and is disposed between the bump foils 120, the end of the elastic piece 115 is to be disposed at the central portion of the land plate 130 You can. Since the plurality of elastic pieces 115 are disposed at the central portion of each land plate 130, the plurality of elastic pieces 115 distribute the weights of the bump foil 120 and the land plate 130 in a balanced manner. Therefore, the gas foil bearing 100 can be supported on the external structure in a balanced and stable manner.

The elastic piece 115 is disposed between neighboring bump foils 120. More specifically, the elastic piece 115 is disposed between the fixing portion 131 of the land plate 130 and the bump foil 120. The elastic piece 115 may be disposed on the base plate 110 in a region where the bump foil 120 and the base plate do not overlap or an area that does not contact.

Due to this arrangement, even if the position of the bump foil 120 is changed by the land plate 130 pressing the bump foil 120, the elastic piece 115 does not overlap with the bump foil 120. Since the elastic piece 115 and the bump foil 120 are disposed so as not to overlap each other, the elastic piece 115 can provide elastic force to the base plate 110 without interfering with the bump foil 120.

4 is a cross-sectional view showing a fluid machine in which the gas foil bearing 100 of FIG. 1 is installed. 5 is an enlarged view of region A of FIG. 4.

4 and 5, the fluid machine may include a rotor 10, an impeller assembly 20, a housing 30, and a gas foil bearing 100.

The rotor 10 may rotate in the longitudinal direction with an axis of rotation, and an impeller assembly 20 may be installed at an end of the rotor 10. The rotor 10 may include a disk 15 extending radially from the outer circumferential surface and spaced apart from the impeller assembly 20 in the longitudinal direction of the rotor 10. When the rotor 10 rotates, the impeller assembly 20 and the disk 15 also rotate.

The impeller assembly 20 may include a blade 21 coupled to the rotor 10 and a shroud 22 surrounding the blade 21. The impeller assembly 20 may pressurize the fluid introduced from the outside. A part discharged from the blade 21 may move along the disk 15 and the gas foil bearing 100.

The housing 30 is arranged to surround the outer side of the rotor 10. The housing 30 is disposed to surround the disk 15 while having a predetermined distance G from the disk 15. The housing 30 is fixed to the shroud 22 and may include a supporter 35 fitted in the gap G between the impeller assembly 20 and the disk 15. The supporter 35 may be integrally formed with the housing 30.

The first portion 35a of the supporter 35 is flat to connect the impeller assembly 20 and the housing 30, and the second portion 35b is inserted into the gap G and an inclined surface guiding the flow of the fluid Can have

The gas foil bearing 100 is interposed in the gap G between the disc 15 and the housing 30. The pair of gas foil bearings 100 may be disposed on both sides of the disk 15 to connect the disk 15 and the housing 30 or form a gap g so that the disk 15 rotates.

6A is a cross-sectional view showing a state in which the gas foil bearing 100 of FIG. 1 is installed, and FIG. 6B is a cross-sectional view showing a state in which the gas foil bearing 100 of FIG. 1 is driven, and FIG. 7A Is a cross-sectional view showing a state in which the gas foil bearing 100 of FIG. 1 is installed from another side, and FIG. 7B is a cross-sectional view showing a state in which the gas foil bearing 100 of FIG. 1 is driven from another side.

5 to 7B, the operation of the gas foil bearing 100 by driving the fluid machine can be described. Hereinafter, an embodiment in which the base plate 110 is arranged to face the housing 30 or the supporter 35 and the land plate 130 faces the disk 15 will be described. However, it is not limited to the above example, and the base plate 110 faces the disk 15 and the land plate 130 faces the housing 30 or the supporter 35.

6A and 7A, when the fluid machine is not driven, the gas foil bearing 100 can close the gap between the disc 15 and the housing 30 and the gap between the disc 15 and the supporter 35. have. Since the elastic piece 115 protruding from the base plate 110 has a preload, the base plate 110 rises by d in the supporter 35. The gas foil bearing 100 may connect the disk 15 and the housing 30 to each other and prevent movement of each other by a gap G.

In detail, since the plurality of elastic pieces 115 disposed along the base plate 110 are supported by the supporter 35, the pre-load of the elastic pieces 115 includes a gas foil bearing 100 having a rotor 10 and a housing ( 30) can be connected and fixed. Therefore, when the fluid machine is not driven, it is possible to prevent both parts from colliding or being worn by the gap G between the disk 15 and the housing 30.

A joint part 140 is installed in the plurality of coupling grooves 111 disposed outside the base plate 110 to fix the gas foil bearing 100 to the supporter 35. The joint portion 140 protrudes from the supporter 35, the support pillar 141 inserted into the coupling groove 111, the elastic member 142 installed between the base plate 110 and the supporter 35, the support pillar It may be provided on the top of the (141) is provided with a coupling member 143 to limit the movement of the base plate (110).

Since the elastic member 142 is installed between the base plate 110 and the supporter 35, it is possible to form a preload on the gas foil bearing 100 together with the elastic piece 115. For example, since the elastic member 142, such as a spring, supports the other surface of the base plate 110, the joint portion 140 has an elastic piece 115 so that the base plate 110 is spaced by a distance d when the rotor 10 is not driven. ) Can increase the preload. However, the elastic member 142 and the coupling member 143 of the joint portion 140 are selectively provided according to the gas foil bearing 100 installation position, and are not necessarily provided for the gas foil bearing 100. .

When not fluid-driven, the pre-load of the joint 140 strongly supports and engages the disk 15 and the housing 30. When the fluid machine is not driven, the gas foil bearing 100 can prevent the durability of the rotating and fixed parts of the fluid machine from being deteriorated by the gap G.

5, 6B and 7B, when the fluid machine is driven, the fluid introduced into the impeller assembly 20 is converted into high pressure fluid and discharged through the shroud 22. Some of the high-pressure fluid passing through the blade 21 flows into the first part 35a of the supporter 35 and the first flow path P1 formed by the impeller assembly 20, and the second part of the supporter 35 Go along (35b). The fluid can move toward the rotor 10 along the inclined surface of the second portion 35b.

The fluid passes through the gas foil bearing 100 while moving in the radial direction along the third flow path P3, the flow direction is switched along the disk 15 in the fourth flow path P4, and the fifth flow path P5 It is discharged through other gas foil bearings.

The gas foil bearing 100 allows relative rotation of the disk 15 and the housing 30 or the disk 15 and supporter 35. When the disk 15 rotates, the fluid moves along the top surface of the land plate 130. Since the fluid passing through the land plate 130 in the downward direction, the bump foil 120 is deformed, and the elastic piece 115 is also inserted into the opening 114. In addition, the fluid passing through the base plate 110, the elastic member 142 is compressed between the base plate 110 and the supporter 35.

The force the fluid transfers to the gas foil bearing 100 causes the base plate 110 to contact the supporter 35 and causes the bump foil 120 to deform in length from L1 to L2. In addition, an allowable gap g is formed between the land plate 130 and the disc 15. The allowable gap (g) allows the rotor 10 to rotate freely without obstructing other structures such as the housing 30.

The gas foil bearing 100 and the fluid machine according to the embodiment of the present invention can stably drive the fluid machine and increase durability. Since the gas foil bearing 100 has a preload, damage between rotating parts and fixed parts of the fluid machine can be reduced. In addition, when the fluid machine is driven, it is possible to improve the rotation efficiency by generating an allowable gap (g) between the rotating part and the fixed part.

In addition, since the gas foil bearing 100 is provided with an elastic piece 115 so as not to interfere with deformation of the bump foil 120, the fluid machine can be quickly and stably supported by a structure in which the base plate 110 is supported when it is driven. have.

Since the gas foil bearing 100 has an elastic piece 115 formed on the base plate 110, the overall thickness of the gas foil bearing 100 can be reduced to make it slim. The slim gas foil bearing 100 can reduce the manufacturing cost, and minimize the gap between the rotating part and the fixed part of the fluid machine to facilitate maintenance storage.

8 is an exploded perspective view showing a part of the gas foil bearing 300 according to another embodiment of the present invention, and FIG. 9 is a cross-sectional view showing a driving state of the gas foil bearing 300 of FIG. 8.

8 and 9, the gas foil bearing 300 may include a base plate 310, a bump foil 320, and a land plate 330.

The base plate 310 may include an opening 314 and an elastic piece 315 protruding outward. In addition, protrusions P and dimples D may be formed on one surface of the base plate 310.

The bump foil 320 may include a connector 321 and a plurality of bumps. The first bump 322 may have a first convex portion 322a, a first concave portion 322b, and a first inclined portion 322c. The second bump 323 may have a second convex portion 323a, a second concave portion 323b, and a second inclined portion 323c. The third bump 324 may have a third convex portion 324a, a third concave portion 324b, and a third inclined portion 324c.

The first convex portions 322a to the third convex portions 324a of the bump foil 320 contact the land plate 330, and the first concave portions 322b to 3rd concave portions 324b are the base plates ( 310).

Since the arrangement of the projections P and / or dimples D affects the operation of the gas foil bearing 300, the projections P and / or dimples D have a base plate 310 and bump foils as shown below. It may be formed in a specific region of 320.

When the gas foil bearing 300 is not driven, the first concave portions 322b to 3rd concave portions 324b of the bump foil 320 contact the region C1 of the base plate 310. When the gas foil bearing 300 is driven, the contact areas of the first recesses 322b to the third recesses 324b change to the C2 area due to deformation of the bump foil 320.

In the base plate 310, due to deformation of the bump foil 320, the projections P and / or dimples D in the regions J1, J2, J3 where the bump foil 320 does not contact the base plate 310 ) May be disposed.

In the base plate 310, the projections P or dimples D are disposed in an area where the recesses of the bump foil 320 do not contact, so that the bump foil 320 follows the base plate 310 without interference during deformation. Can move.

The bump foil 320 may have protrusions (P) or dimples (D) formed on a surface that does not contact the base plate 310 or a surface that does not contact the land plate 330.

Protrusions P and / or dimples D may be disposed on the lower surface of the convex portion facing the base plate 310 and the lower surface of the inclined portion. In addition, protrusions P and / or dimples D may be disposed on the upper surface of the concave portion facing the land plate 330 and the upper surface of the inclined portion. Particularly, since the projection P or the dimple D is not disposed in the region C3 in contact with the land plate 330, the bump foil 320 does not interfere with the projection P or the dimple D when deformed. It can move along the land plate 330.

The upper surface of the base plate 310 and the lower surface of the bump foil 320 form a tunnel-shaped space, and the upper surface of the bump foil 320 and the lower surface of the land plate 330 form a tunnel-shaped space.

Since the projections P and / or dimples D are formed inside the tunnel-shaped space, it is possible to change the flow of the fluid passing through them. When the gas foil bearing 300 is driven, the fluid not only moves along the land plate 330, but also moves to the space between the base plate 310 and the land plate 330. That is, the fluid passes through the tunnel-shaped space formed by the base plate 310 and the bump foil 320 and the tunnel-shaped space formed by the bump foil 320 and the land plate 330.

The fluid passing through the tunnel-shaped space may discharge heat generated from the gas foil bearing 300 to the outside. The protrusions P and / or dimples D increase the surface area in which the fluid contacts the tunnel-shaped space, thereby increasing the area where heat is exchanged. In addition, the projections P and / or the dimples D can change the flow of the fluid to turbulence so that heat can be effectively transferred.

The gas foil bearing 300 and the fluid machine according to the embodiment of the present invention can stably drive the fluid machine and increase durability. Since the gas foil bearing 300 has a preload, damage between rotating parts and fixed parts of the fluid machine can be reduced.

In addition, the gas foil bearing 300 can effectively discharge heat generated when the protrusion P and / or the dimple D are driven, thereby improving the durability of the gas foil bearing 300.

Although the invention has been described in connection with the preferred embodiments mentioned above, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Therefore, the scope of the appended claims will include such modifications or variations as long as they belong to the subject matter of the present invention.

The present invention is applicable to industrially available gas foil bearings and fluid machines comprising the same.

Claims

Base plate;

A bump foil disposed in plural on one surface of the base plate; And

Includes; a plurality of land plates are disposed to cover each of the bump foil;

The base plate protrudes outward from the other surface, and has a plurality of elastic pieces disposed between the adjacent bump foils, gas foil bearing.
According to claim 1,

The elastic piece is formed by cutting in the base plate, gas foil bearing.
According to claim 1,

The land plate has one side fixed to one surface of the base plate and extended to the other side,

The bump foil is fixed to one surface of the base plate and extends along the land plate,

The elastic piece is a gas foil bearing, extending in one direction from one surface of the base plate.
According to claim 1,

The elastic piece

A gas foil bearing disposed in an area where the bump foil and the base plate do not overlap among the base plates.
According to claim 1,

The land plate and the elastic piece extend in the first direction along the base plate,

The bump foil extends along a second direction opposite the first direction along the base plate, a gas foil bearing.
According to claim 1,

The elastic piece is disposed radially along the base plate, a gas foil bearing.
According to claim 1,

The base plate

A gas foil bearing comprising; a joint portion having an elastic member disposed between the external structure and the other surface of the base plate.
Rotatable rotors;

An impeller assembly installed at an end of the rotor;

A disk extending radially from the outer circumferential surface of the rotor and spaced apart from the impeller assembly in the longitudinal direction of the rotor;

A housing arranged to surround the disk with a predetermined distance from the disk; And

And a gas foil bearing interposed in the gap between the disc and the housing, the base plate disposed to face the housing or the disc, and a gas foil bearing having an elastic piece protruding outward from the base plate.
The method of claim 8,

If the rotor does not rotate, the elastic piece separates the base plate from the housing or the disc,

When the rotor rotates, a fluid machine discharged from the impeller assembly presses the gas foil bearing to contact the base plate with the housing or the disk.
The method of claim 8,

The gas foil bearing

A bump foil disposed in plural on one surface of the base plate; And

And a plurality of land plates disposed to cover the bump foils, respectively.

The elastic piece protrudes outwardly from the other side of the base plate, and is disposed between the adjacent bump foils.
The method of claim 10,

The land plate has one side fixed to one surface of the base plate and extended to the other side,

The bump foil is fixed to one surface of the base plate corresponding to the other side of the land plate and extends to one side of the land plate,

The elastic piece is a fluid machine, wherein a portion connected to the base plate is disposed adjacent to one side of the base plate and extends to the other side of the base plate.
The method of claim 10,

The elastic piece

A fluid machine, wherein the bump foil of the base plate is disposed in an area where the base plate does not overlap.
The method of claim 8,

The base plate

And a joint part having an elastic member disposed between the disk or the housing and the other surface of the base plate.