JP2020172909A - Rotary machine and component of the same - Google Patents

Abstract

To provide a rotary machine which inhibits leakage flow of a liquid in a casing and reduces wear of a component, and to provide the component of the rotary machine.SOLUTION: A rotary machine 100 includes: a rotary structure 10 having a rotary shaft 1; a casing 3 which houses the rotary structure 10; and a component 4 which limits flow of a liquid L between the rotary structure 10 and the casing 3. At least one of the rotary structure 10 and the casing 3 has a facing area facing the component 4. A polymer brush layer 50 is formed in at least one of the component 4 and the facing area.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotary machine and its parts.

A rotary machine such as a liquid feed pump includes, for example, a rotary shaft, parts such as a liner ring, a bush, a balance disc, and a balance piston, and a casing for accommodating them. The parts are arranged, for example, in the casing so as to suppress the flow of liquid.

Japanese Unexamined Patent Publication No. 2018-185005

In the rotary machine, if the gap between the parts such as the liner ring and the rotating shaft is narrowed, the leakage flow of the liquid can be reduced. However, if the gap is narrowed, there is a concern that the wear of the parts will increase. Therefore, it has not been easy to reduce the leakage flow of the liquid and reduce the wear of the parts.

One aspect of the present invention is to provide a rotary machine and its parts that can suppress the leakage flow of liquid in the casing and reduce the wear of parts.

One aspect of the present invention comprises a rotating structure having a rotating shaft, a casing accommodating the rotating structure, and a component that restricts the flow of liquid between the rotating structure and the casing. Provided is a rotary machine in which at least one of the rotating structure and the casing has a facing region facing the component, and a polymer brush layer is formed in at least one of the component and the facing region.

The component may be fixed to the rotating structure or the casing.

The component may be non-fixed to the rotating structure and the casing.

The rotating structure further includes a liquid feeding mechanism that delivers the liquid by rotating with the rotating shaft, and the liquid feeding mechanism is preferably an impeller that delivers the liquid by centrifugal force as it rotates. ..

Another aspect of the present invention is used in a rotary machine including a rotating structure having a rotating shaft and a casing accommodating the rotating structure, and the liquid in a gap between the rotating structure and the casing. Provided is a component that is installed to restrict the flow of a polymer brush layer and has a polymer brush layer formed in at least a part of a region facing at least one of the rotating structure and the casing.

Yet another aspect of the present invention comprises a first structure and a second structure that rotates relative to the first structure, wherein the first structure and the second structure are: Provided is a rotary machine having facing regions facing each other and having a polymer brush layer formed in at least one of the facing regions of the first structure and the second structure.

According to one aspect of the present invention, it is possible to suppress the leakage flow of liquid in the casing and reduce the wear of parts.

It is a block diagram of the centrifugal pump which is a rotary machine of 1st Embodiment. It is a block diagram of a part of the centrifugal pump of FIG. It is a schematic diagram of an example of a polymer brush layer. It is a block diagram of the centrifugal pump provided with the modification of the liner ring. It is a block diagram of a part of a pump which is a rotary machine of 2nd Embodiment. It is a block diagram of a part of the rotary fluid machine which is a rotary machine of 3rd Embodiment. It is a block diagram of a part of the multistage pump which is a rotary machine of 4th Embodiment. It is a block diagram of a part of the rotary machine of 5th Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram of a centrifugal pump 100 which is a rotary machine (rotary device) of the first embodiment. Hereinafter, the positional relationship of the components will be described with the left side in FIG. 1 as the front F and the right side as the rear R.

As shown in FIG. 1, the centrifugal pump 100 includes a rotating shaft 1, a plurality of impellers 2, a pump casing 3, and a plurality of liner rings 4. The rotating shaft 1 extends in the front-rear direction, and its rear end is connected to an electric motor (not shown). The rotating shaft 1 and the impeller 2 are collectively referred to as a rotating structure 10. C1 is the central axis of the rotating shaft 1. The centrifugal pump 100 is a multi-stage centrifugal pump in which a plurality of impellers 2 are provided in multiple stages.

The impeller 2 (liquid feeding mechanism) includes a front shroud 5, a rear shroud 6, and blades 7. The front shroud 5 includes a disc-shaped main body portion 8 and a tubular inlet portion 9 extending forward from the main body portion 8.
The plurality of impellers 2 are attached to the rotating shaft 1 in multiple stages at intervals in the front-rear direction. The impeller 2 located at the front of the plurality of impellers 2 is referred to as a first impeller 2A. The entrance portion 9 of the first impeller 2A is referred to as the first entrance portion 9A.

The second impeller 2 from the front of the plurality of impellers 2 is referred to as a second impeller 2B. The second impeller 2B is provided behind the first impeller 2A. The entrance portion 9 of the second impeller 2B is referred to as a second entrance portion 9B. The impeller 2 (2A, 2B) is housed in the pump casing 3 (specifically, the inner casing 12). The impeller 2 is rotationally driven together with the rotating shaft 1 by an electric motor (not shown).

The pump casing 3 (casing) includes an outer casing 11, an inner casing 12, a plurality of guide vanes 13, and a plurality of side plates 14.
The outer casing 11 includes an outer wall 21, a front wall 22, an introduction cylinder portion 23, and a flange portion 24. The outer wall 21 is formed in a tubular shape. The front wall 22 is provided at the front end of the outer wall 21. An introduction port 22a is formed in the center of the front wall 22. The introduction cylinder portion 23 extends forward from the inner peripheral edge of the introduction port 22a. The internal space of the introduction cylinder portion 23 serves as a flow path for the liquid L. The flange portion 24 extends outward from the front end of the introduction cylinder portion 23.

The inner casing 12 includes a tubular outer wall 31, a front wall 32, a first rear extending portion 33, an intermediate wall 34, and a second rear extending portion 35. The outer wall 31 is formed in a tubular shape. The front wall 32 is provided at the front end of the outer wall 31. An opening 32a is formed in the center of the front wall 32. The first rear extending portion 33 has a tubular shape and extends rearward from the inner peripheral edge of the opening 32a. The inner peripheral surface of the first rear extending portion 33 faces the outer peripheral surface 9a of the inlet portion 9 of the first impeller 2A. The inner diameter of the first rear extension portion 33 is larger than the outer diameter of the inlet portion 9 of the first impeller 2A.

The intermediate wall 34 is provided behind the front wall 32 at a distance from the front wall 32. An opening 34a is formed in the center of the intermediate wall 34. The second rear extending portion 35 has a tubular shape and extends rearward from the inner peripheral edge of the opening 34a. The inner peripheral surface of the second rear extending portion 35 faces the outer peripheral surface 9b of the inlet portion 9 of the second impeller 2B. The inner diameter of the second rear extension portion 35 is larger than the outer diameter of the inlet portion 9 of the second impeller 2B.

Of the plurality of guide vanes 13, the first guide vane 13A has an outer wall portion 37 extending rearward from the rear surface of the front wall 32 and a rear wall portion extending rearward from the rear end of the outer wall portion 37 in a direction approaching the rotation axis 1. 38 and. The first guide vane 13A surrounds at least a part of the first impeller 2A. A first return passage 41 is secured behind the rear wall portion 38.

Of the plurality of guide vanes 13, the second guide vane 13B includes an outer wall portion 39 extending from the rear surface of the intermediate wall 34 and a rear wall portion 40 extending from the rear end of the outer wall portion 39 in a direction approaching the rotation axis 1. To be equipped. The second guide vane 13B surrounds at least a part of the second impeller 2B. A second return passage 42 is secured behind the rear wall portion 40.

Of the plurality of side plates 14, the first side plate 14A is provided on the front surface of the front wall 32. Of the plurality of side plates 14, the second side plate 14B is provided on the front surface of the intermediate wall 34.
The inner casing 12, the plurality of guide vanes 13, and the plurality of side plates 14 are housed in the outer casing 11.

The liner ring 4 (seal member) is formed in an annular shape. The cross-sectional shape of the liner ring 4 is, for example, a rectangular shape. A rotating shaft 1 is inserted through the liner ring 4. The liner ring 4 is a component of the centrifugal pump 100.
Of the plurality of liner rings 4, the first liner ring 4A is provided between the inner peripheral surface of the first rear extending portion 33 and the outer peripheral surface 9a of the first inlet portion 9A. Therefore, the first liner ring 4A can limit the forward flow of the liquid L between the first rear extension portion 33 and the first inlet portion 9A.
The outer peripheral surface of the first liner ring 4A is fixed to the inner peripheral surface of the first rear extending portion 33. The outer peripheral surface 9a of the first inlet portion 9A is a facing region facing the inner peripheral surface 4a of the first liner ring 4A.

Of the plurality of liner rings 4, the second liner ring 4B is provided between the inner peripheral surface of the second rear extending portion 35 and the outer peripheral surface 9b of the second inlet portion 9B. Therefore, the second liner ring 4B can limit the forward flow of the liquid L between the second rear extension portion 35 and the second inlet portion 9B.
The outer peripheral surface of the second liner ring 4B is fixed to the inner peripheral surface of the second rear extending portion 35. The outer peripheral surface 9b of the second inlet portion 9B is a facing region facing the inner peripheral surface 4b of the second liner ring 4B.

As shown in FIGS. 1 and 2, a polymer brush layer 50 is formed on the inner peripheral surfaces 4a and 4b of the liner ring 4. The "polymer brush" is composed of an aggregate of a plurality of polymer chains extending in a direction intersecting the surface of the base material (inner peripheral surfaces 4a, 4b) (for example, a direction perpendicular to the surface of the base material). ..

FIG. 3 is a schematic view of an example of the polymer brush layer 50. The polymer brush layer 50 is composed of, for example, a plurality of polymer graft chains 51 bonded to the inner peripheral surface 4a of the liner ring 4. The plurality of polymer graft chains 51 are in a direction intersecting the inner peripheral surface 4a (for example, a direction substantially perpendicular to the inner peripheral surface 4a) and away from the inner peripheral surface 4a (upper in FIG. 3). ).

The polymer brush layer 50 is formed, for example, by introducing a polymer graft chain onto the surface of the base material (inner peripheral surfaces 4a and 4b of the liner ring 4) by a surface-initiated living radical polymerization method, and then swelling with a liquid substance. can do.
In the surface-initiated living radical polymerization method, a polymer graft chain is formed by introducing a polymerization initiator group into the surface of a substrate which is the starting point of the polymer graft chain and performing living radical polymerization starting from this polymerization initiator group. (See, for example, JP-A-2009-59659 and JP-A-2010-218984).

As the monomer for forming the polymer graft chain, it is preferable to use a monomer having an ionic dissociation group, for example, a monomer having an ionic dissociation group and a reactive double bond group. When a monomer having an ionic dissociation group is used, a polymer graft chain having an ionic dissociation group can be obtained. By using a monomer having an ionic dissociative group, the coefficient of friction of the sliding surface can be reduced.

The method for introducing the polymerization initiator group into the surface of the base material is not particularly limited, but a polymerization initiator solution is prepared by dissolving or dispersing the polymerization initiator in a solvent, and the base material is added to the prepared polymerization initiator solution. Examples include a method of immersing the solvent.

The polymerization initiator is not particularly limited, but a compound having a group capable of binding to a substrate and a radical generating group is preferable, and for example, a TEMPO-based, ATRP-based, RAFT-based, or RTCP-based polymerization initiator is used. Can be done. Examples of groups that can be bonded to the base material include -SiCl ₃ , -Si (CH ₃ ) Cl ₂ , -Si (CH ₃ ) 2Cl, and -Si (OR) ₃ (in these formulas, R is methyl, ethyl. , Propyl or butyl.)

A polymerization initiator is introduced onto the surface of the substrate using the above-mentioned polymerization initiator, and then the substrate into which the polymerization initiator is introduced is immersed in a polymerization reaction solution containing the above-mentioned monomer and heated as necessary. By doing so, a polymer graft chain containing the above-mentioned monomer as a polymerization unit can be formed on the surface of the substrate.

Next, the operation of the centrifugal pump 100 will be described.
As shown in FIG. 1, when the electric motor (not shown) is operated, the impellers 2 (2A, 2B) rotate around the central shaft C1 together with the rotating shaft 1. The liquid L taken in from the introduction cylinder portion 23 is introduced into the first impeller 2A, boosted by the first impeller 2A, and sent out to the first return passage 41. The liquid L in the first return passage 41 is introduced into the second impeller 2B, boosted by the second impeller 2B, and sent to the second return passage 42. In this way, the liquid L is sequentially delivered by the plurality of impellers 2, and is discharged to the outside from the discharge port (not shown).

A part of the liquid L may return to the previous stage due to the leakage flow. For example, a part of the liquid L boosted by the first impeller 2A may flow forward through a gap between the inner peripheral surface 4a of the first liner ring 4A and the outer peripheral surface 9a of the first inlet portion 9A. is there. A part of the liquid L boosted by the second impeller 2B may flow forward through the gap between the inner peripheral surface 4b of the second liner ring 4B and the outer peripheral surface 9b of the second inlet portion 9B.

In the centrifugal pump 100, since the polymer brush layers 50 are formed on the inner peripheral surfaces 4a and 4b of the liner ring 4, the friction of the liner ring 4 with respect to the outer peripheral surfaces 9a and 9b of the inlet portion 9 can be reduced. Therefore, the gap between the liner ring 4 and the inlet portion 9 can be set narrow. By narrowing the gap between the liner ring 4 and the inlet portion 9, the flow of the liquid L in this gap can be restricted. Therefore, in the centrifugal pump 100, wear of the liner ring 4 and the inlet portion 9 can be suppressed, and the leakage flow of the liquid L can be reduced.

FIG. 4 is a configuration diagram of a centrifugal pump 200 provided with a modification of the liner ring 4 shown in FIG. Hereinafter, the common configuration with the centrifugal pump 100 shown in FIGS. 1 and 2 will be designated by the same reference numerals and description thereof will be omitted.
The centrifugal pump 200 has the same configuration as the centrifugal pump 100 shown in FIG. 1 except that the liner ring 204 (part) is not fixed to the inner casing 12 (rear extending portions 33, 35; see FIG. 1). ..
The liner ring 204 is not fixed to either the inner casing 12 (rear extending portions 33, 35; see FIG. 1) and the inlet portion 9. That is, the liner ring 204 is a type (floating type) liner ring that is not fixed to the inner casing 12 and the inlet portion 9. The inner peripheral surfaces of the rear extending portions 33 and 35 are facing regions facing the liner ring 204.

In the liner ring 204, the polymer brush layer 50 is formed not only on the inner peripheral surface 204a but also on the outer peripheral surface 204c.

In the centrifugal pump 200, since the polymer brush layer 50 is formed on the inner peripheral surface 204a and the outer peripheral surface 204c of the liner ring 4, the outer peripheral surface of the inlet portion 9 and the rear extending portions 33 and 35 (see FIG. 1) The friction of the liner ring 204 with respect to the inner peripheral surface can be reduced. Therefore, the gap between the liner ring 204 and the inlet portion 9 and the gap between the liner ring 204 and the rear extending portions 33 and 35 (see FIG. 1) can be set narrow. By narrowing the gap, the flow of the liquid L in this gap can be restricted. Therefore, it is possible to suppress the wear of the liner ring 204, the inlet portion 9, and the rear extension portions 33, 35, and reduce the leakage flow of the liquid L.

FIG. 5 is a block diagram of a part of the pump 300, which is the rotary machine of the second embodiment.
The pump 300 includes a rotating shaft 301, a liquid feeding mechanism (not shown), a pump casing 303, and a liner ring 304 (parts). The rotating shaft 301 and the liquid feeding mechanism (not shown) are collectively referred to as a rotating structure 310.

A rotating shaft 301 is inserted through the liner ring 304. The liner ring 304 is housed in a recess 305 formed on the inner peripheral surface of the pump casing 303. The inner peripheral surface 304a of the liner ring 304 faces the outer peripheral surface (face-to-face region) of the rotating shaft 301. The outer peripheral surface 304b of the liner ring 304 faces the inner peripheral surface (face-to-face region) of the recess 305. The front surface 304c of the liner ring 304 faces the front surface (face-to-face region) of the recess 305. The liner ring 304 is not fixed to the rotating shaft 301 and the pump casing 303.

A polymer brush layer 50 (see FIG. 2) is formed on the inner peripheral surface 304a and the outer peripheral surface 304b of the liner ring 304. The polymer brush layer may be formed on the front surface 304c of the liner ring 304.

In the pump 300, since the polymer brush layer is formed on the inner peripheral surface 304a and the outer peripheral surface 304b of the liner ring 304, the friction between the liner ring 304 and the facing region can be reduced. Therefore, the gap between the liner ring 304 and the facing region can be set narrow. Therefore, it is possible to suppress wear between the liner ring 304 and the facing region and reduce the leakage flow of the liquid L.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. The polymer brush layer may be formed on at least one of the liner ring and the facing region facing the liner ring. For example, in the centrifugal pumps shown in FIGS. 1 and 4, the polymer brush layer is formed only on the liner ring in the region facing the liner ring.

The location where the polymer brush layer is formed may be a facing region facing the liner ring. The facing region is, for example, the outer peripheral surface of the inlet portion 9 shown in FIG. 1, the inner peripheral surface of the rear extending portions 33, 35, and the like. The polymer brush layer may be formed only in the facing region of the liner ring and the facing region. The polymer brush layer may be formed in both the liner ring and the facing area.

In the centrifugal pump 100 shown in FIG. 1 and the like, the polymer brush layer 50 is formed over the entire inner peripheral surface of the liner ring 4, but the polymer brush layer is formed only in a part of the inner peripheral surface of the liner ring 4. It may be formed. That is, the polymer brush layer may be formed in at least a part of the area of the liner ring facing the rotating structure. When the polymer brush layer is formed in the facing region, the polymer brush layer may be formed in at least a part of the facing region.

In the centrifugal pump 100 shown in FIG. 1 and the like, the liner rings 4 and 4 are fixed to the rear extension portions 33 and 35, but the liner ring may be fixed to the outer peripheral surface of the inlet portion of the impeller. .. In this case, the liner ring is not fixed to the rear extension. Since the liner ring is fixed to the entrance, it rotates together with the impeller. The polymer brush layer is formed only on the outer peripheral surface of the inner peripheral surface and the outer peripheral surface of the liner ring.

In the pump 300 shown in FIG. 5, the liner ring 304 is not fixed to the rotating shaft 301 and the pump casing 303, but the liner ring 304 may be fixed to either the rotating shaft 301 or the pump casing 303. ..
The liquid feeding mechanism may be able to deliver the liquid by rotating with the rotation shaft. The liquid feeding mechanism is not limited to the impeller.

FIG. 6 is a partial configuration diagram of the rotary fluid machine 400, which is the rotary machine of the third embodiment.
The rotary fluid machine 400 includes a rotary shaft 401, a mechanical seal 402, a casing 403, a bush 404 (part), and a liquid feeding mechanism (not shown). The rotating shaft 401 and the liquid feeding mechanism (not shown) form a rotating structure. The bush 404 is formed in an annular shape. A rotating shaft 401 is inserted through the bush 404. The bush 404 is housed in a recess 405 formed on the inner peripheral surface of the casing 403. The inner peripheral surface 404a of the bush 404 faces the outer peripheral surface (face-to-face region) of the rotating shaft 401. The outer peripheral surface 404b of the bush 404 faces the inner peripheral surface (face-to-face region) of the recess 405. Since the bush 404 is provided between the rotating shaft 401 and the casing 403, it is possible to limit the flow of the liquid between the rotating shaft 401 and the casing 403 in the direction along the rotating shaft 401.

A polymer brush layer 50 (see FIG. 2) is formed on at least one of the inner peripheral surface 404a and the outer peripheral surface 404b of the bush 404. The polymer brush layer may be formed in the facing region of the inner peripheral surface 404a and the outer peripheral surface 404b.

In the rotary fluid machine 400, the polymer brush layer can reduce the friction between the bush 404 and the facing region. Therefore, the gap between the bush 404 and the facing region can be set narrow. Therefore, it is possible to suppress wear between the bush 404 and the facing region and reduce the leakage flow of the liquid.

FIG. 7 is a partial configuration diagram of the multi-stage pump 500, which is the rotary machine of the fourth embodiment.
The multi-stage pump 500 includes a rotary shaft 501, an impeller 502, a pump casing 503, and a thrust balance mechanism 504. The rotating shaft 501 and the impeller 502 form a rotating structure. The thrust balance mechanism 504 includes a balance disc 505 (part), a balance piston 506 (part), and a balance sheet 507.

The balance disc 505 and the balance piston 506 are fixed to the rotating shaft 501. The balance sheet 507 is fixed to the pump casing 503. The outer peripheral surface 505b of the balance disk 505 faces the inner peripheral surface (face-to-face region) of the pump casing 503. The outer peripheral surface 506b of the balance piston 506 faces the inner peripheral surface (face-to-face region) of the pump casing 503. The balance piston 506 and the balance sheet 507 can limit the flow of liquid in the direction along the rotary shaft 501 between the rotary shaft 501 and the pump casing 503.

A polymer brush layer 50 (see FIG. 2) is formed on at least one of the outer peripheral surface 505b and the facing region of the balance disk 505. A polymer brush layer 50 (see FIG. 2) is formed on at least one of the outer peripheral surface 506b and the facing region of the balance piston 506.

In the multistage pump 500, the polymer brush layer can reduce the friction between the balance disc 505 and the balance piston 506 and the facing region. Therefore, wear of the balance disc 505 and the balance piston 506 and the facing region can be suppressed, and the leakage flow of the liquid can be reduced.

FIG. 8 is a block diagram of a part of the rotary machine 600 of the fifth embodiment.
The rotary machine 600 includes a first structure 601 and a second structure 602. The first structure 601 is formed in a columnar shape. The second structure 602 is formed in a cylindrical shape. The central axis of the first structure 601 and the central axis of the second structure 602 coincide with each other. The first structure 601 is housed in the internal space 603 of the second structure 602.

The first structure 601 divides the internal space 603 into a first space 603A on one end side of the second structure 602 and a second space 603B on the other end side. The first structure 601 can limit the flow of liquid from the first space 603A to the second space 603B.

The outer peripheral surface 601a of the first structure 601 is a facing region facing the inner peripheral surface 602a of the second structure 602 through the gap 604. The inner peripheral surface 602a of the second structure 602 is a facing region facing the outer peripheral surface 601a of the first structure 601 through the gap 604.

The first structure 601 and the second structure 602 are relatively rotatable. The rotary machine 600 may have any of the following configurations (i) to (iii). (I) The first structure 601 is rotatable around the central axis, and the second structure 602 does not rotate. (Ii) The first structure 601 does not rotate, and the second structure 602 can rotate around the central axis. (Iii) Both the first structure 601 and the second structure 602 are rotatable around the central axis.

A polymer brush layer 50 (see FIG. 2) is formed on at least one of the outer peripheral surface 601a of the first structure 601 and the inner peripheral surface 602a of the second structure 602.

In the rotary machine 600, the polymer brush layer can reduce the friction between the first structure 601 and the second structure 602. Therefore, it is possible to suppress the wear of the first structure 601 and the second structure 602 and reduce the leakage flow of the liquid.

1,301,401,501 ... Rotating shaft, 2,502 ... Impeller (liquid feeding mechanism), 2A ... First impeller (liquid feeding mechanism), 2B ... Second impeller (liquid feeding mechanism), 3,303 , 503 ... Pump casing (casing), 4,204,304 ... Liner ring (part), 9a, 9b ... Outer peripheral surface (face-to-face area), 10,310 ... Rotating structure, 50 ... Polymer brush layer, 100, 200 ... Centrifugal pump (rotary machine), 300 ... pump (rotary machine), 400 ... rotary fluid machine (rotary machine), 403 ... casing, 404 ... bush (parts), 500 ... multi-stage pump, 505 ... balance disc (parts) ), 506 ... Balance piston (part), 601 ... First structure, 601a ... Outer peripheral surface (face-to-face region), 602 ... Second structure, 602a ... Inner peripheral surface (face-to-face region).

Claims (6)

A rotating structure with a rotating shaft,
A casing that houses the rotating structure and
A component that limits the flow of liquid between the rotating structure and the casing.
At least one of the rotating structure and the casing has a facing region facing the component.
A rotary machine in which a polymer brush layer is formed on at least one of the parts and the facing region. The rotary machine according to claim 1, wherein the parts are fixed to the rotary structure or the casing. The rotary machine according to claim 1, wherein the parts are non-fixed to the rotary structure and the casing. The rotating structure further includes a liquid feeding mechanism that delivers liquid by rotating with the rotating shaft.
The rotary machine according to any one of claims 1 to 3, wherein the liquid feeding mechanism is an impeller that delivers the liquid by centrifugal force as it rotates. It is used in a rotary machine including a rotary structure having a rotary shaft and a casing for accommodating the rotary structure.
Installed to limit the flow of the liquid in the gap between the rotating structure and the casing.
A component in which a polymer brush layer is formed in at least a part of a region facing at least one of the rotating structure and the casing. A first structure and a second structure that rotates relative to the first structure are provided.
The first structure and the second structure have facing regions facing each other and have facing regions.
A rotary machine in which a polymer brush layer is formed in at least one of the first structure and the facing region of the second structure.

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