WO2018173315A1 - Shaft seal device, and rotating machine - Google Patents

Shaft seal device, and rotating machine Download PDF

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Publication number
WO2018173315A1
WO2018173315A1 PCT/JP2017/030942 JP2017030942W WO2018173315A1 WO 2018173315 A1 WO2018173315 A1 WO 2018173315A1 JP 2017030942 W JP2017030942 W JP 2017030942W WO 2018173315 A1 WO2018173315 A1 WO 2018173315A1
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WO
WIPO (PCT)
Prior art keywords
foreign matter
rotor
seal
shaft seal
seal device
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PCT/JP2017/030942
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French (fr)
Japanese (ja)
Inventor
亜積 吉田
昂平 尾▲崎▼
上原　秀和
西本　慎
Original Assignee
三菱日立パワーシステムズ株式会社
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Publication of WO2018173315A1 publication Critical patent/WO2018173315A1/en

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  • the present invention relates to a shaft seal device and a rotary machine.
  • This application claims priority based on Japanese Patent Application No. 2017-57991 filed in Japan on March 23, 2017, the contents of which are incorporated herein by reference.
  • Rotating machines such as gas turbines and steam turbines are provided with a shaft seal device in order to reduce the amount of leakage of working fluid flowing from the high pressure side to the low pressure side around the rotor.
  • the shaft seal device includes a seal member that partitions a high pressure region and a low pressure region around the rotor.
  • Patent Document 1 discloses a configuration including a brush seal on the upstream side of the seal body.
  • the brush seal is composed of a support portion provided on the radially outer side of the rotor and a number of wires projecting radially inward from the support portion.
  • An object of the present invention is to provide a shaft seal device and a rotary machine that can capture foreign matter on the upstream side of a seal body and reduce the influence of the foreign matter on the seal body.
  • the shaft seal device is provided between the rotor and the stator surrounding the rotor, and a space between the rotor and the stator is a high pressure region in the central axis direction of the rotor. And the low pressure area.
  • the shaft seal device includes a seal portion and a foreign matter collection portion.
  • the seal portion is fixed to the stator and protrudes toward the rotor.
  • the foreign matter recovery part is provided in a high pressure region upstream of the seal part, and a foreign matter recovery space is formed therein. In the foreign matter collection part, an introduction hole for introducing foreign matter in the high pressure region into the foreign matter collection space is formed.
  • the foreign matter that has entered the space between the rotor and the stator is introduced into the foreign matter collection space from the introduction hole of the foreign matter collection section.
  • the foreign matter is collected by the foreign matter collecting portion provided on the upstream side of the seal portion, thereby suppressing the foreign matter from reaching the seal body.
  • the foreign matter collecting part according to the first aspect may further include a filter part having a plurality of openings through which the foreign matter passes.
  • the foreign matter recovery part according to the second aspect may include a plurality of the filter parts, and the plurality of filter parts may have different diameters of the openings.
  • the introduction hole according to the second or third aspect opens toward the radially inner side, and the filter portion is disposed so as to close the radially inner side of the introduction hole.
  • the opening portion of the filter portion may be inclined so as to open toward the upstream side in the rotational direction of the rotor at least on the radially inner side.
  • the filter portion according to any one of the second to fourth aspects has a concave portion that is recessed toward the radially inner side on the outer peripheral surface facing the radially outer side. May be.
  • the introduction hole according to any one of the first to fifth aspects may face the axial high-pressure side or the radial inner side.
  • the introduction hole can be opened in the direction in which the foreign material flows, and the foreign material can be efficiently guided to the foreign material recovery unit.
  • a capturing member that captures the foreign material may be provided in the foreign material recovery space.
  • the shaft seal device according to any one of the first to seventh aspects further includes a foreign matter discharge hole for discharging the foreign matter collected in the foreign matter collection space. May be.
  • a foreign matter discharge hole for discharging the foreign matter collected in the foreign matter collection space.
  • the rotary machine includes the shaft seal device according to any one of the first to eighth aspects.
  • a foreign material is collect
  • FIG. 4 is a diagram showing a configuration of the foreign matter collection unit, and is a cross-sectional view taken along line YY of FIG. It is sectional drawing which shows the structure of the 1st modification of the said shaft seal apparatus. It is sectional drawing which shows the structure of the 2nd modification of the said shaft seal apparatus.
  • FIG. 1 is a view of the configuration of a shaft seal device provided in a rotary machine according to an embodiment of the present invention, viewed from the direction of the central axis of a rotor.
  • FIG. 2 is a sectional view taken along line XX in FIG.
  • FIG. 3 is a cross-sectional view showing the configuration of the foreign matter recovery unit provided in the shaft seal device.
  • FIG. 4 is a diagram showing the configuration of the foreign matter collection unit, and is a cross-sectional view taken along line YY of FIG. As shown in FIGS.
  • a rotary machine 100 such as a steam turbine or a gas turbine is provided with a stator 103 attached to a passenger compartment (not shown) thereof and an inner side of the stator 103 in the radial direction Dr. And a rotor 102 provided rotatably (not shown).
  • the shaft seal device 1 is provided in an annular space between the rotor 102 and the stator 103. As shown in FIG. 2, the shaft sealing device 1 has an annular space formed on the low pressure region S ⁇ b> 1 formed on the first side in the central axial direction Da of the rotor 102 and on the second side in the central axial direction Da. And the high pressure region S2.
  • the shaft seal device 1 includes a plurality (eight in this embodiment) of seal segments (seal ring pieces) 20 extending in an arc shape.
  • the plurality of seal segments (seal ring pieces) 20 are annularly arranged in the circumferential direction Dc.
  • the shaft seal device 1 constitutes an annular seal ring 5 as a whole by arranging these eight seal segments 20 in the circumferential direction Dc. That is, the seal ring 5 of the shaft seal device 1 has a structure that is divided into a plurality of portions in the circumferential direction Dc of the rotor 102.
  • the seal segment 20 is held by a housing 104 provided inside the stator 103 in the radial direction Dr.
  • the housing 104 is formed with a groove 105 extending continuously in the circumferential direction Dc around the central axis of the rotor 102.
  • the groove 105 has an accommodation recess 106 and a communication portion 107.
  • the accommodating recess 106 is formed in a rectangular cross section.
  • the communication portion 107 communicates the accommodating recess 106 with the inner peripheral surface 104 f of the housing 104.
  • Protruding portions 108 are formed on both sides of the communication portion 107 in the central axis direction Da so as to protrude from the inner wall surface 106a of the housing recess 106 toward the inside of the central axis direction Da. Due to these protrusions 108, the communication portion 107 has an opening dimension in the central axis direction Da smaller than a width dimension in the central axial direction Da of the housing recess 106.
  • the seal segment 20 includes a seal member main body 21, a thin plate seal (seal body) 25, and a seal fin (seal body) 26.
  • the seal member body 21 is integrally provided with a pressure receiving portion 22, a base portion 23, and a connecting portion 24.
  • the pressure receiving portion 22 is housed in the housing recess 106.
  • a pressure receiving surface 22 f is formed outside the pressure receiving portion 22 in the radial direction Dr.
  • the seal member main body 21 includes notches 35 at a plurality of locations spaced in the circumferential direction Dc. These notches communicate the space 106 s between the pressure receiving surface 22 f and the inner peripheral surface 106 g located outside the radial direction Dr of the housing recess 106 and the high pressure region S ⁇ b> 2.
  • the base portion 23 is disposed on the inner side in the radial direction Dr from the inner peripheral surface 104 f of the housing 104.
  • the width dimension of the base portion 23 in the central axis direction Da is larger than the width dimension of the communication portion 107 in the central axis direction Da.
  • the connecting part 24 connects the pressure receiving part 22 and the base part 23 through the communication part 107.
  • the thin plate seal 25 includes a plurality of metal thin plate seal pieces 27 arranged in a multiple manner with a minute interval in the circumferential direction Dc of the rotor 102.
  • the base end portions 27a outside the radial direction Dr are fixed to each other by welding, for example.
  • the plurality of thin plate seal pieces 27 are held at the concave end 30 formed in the seal member main body 21 through the holding member 28 at the base end portion 27a outside in the radial direction Dr.
  • the concave groove 30 includes an outer peripheral groove portion 31 and an inner peripheral groove portion 32.
  • the outer peripheral groove portion 31 is formed at an intermediate portion in the radial direction Dr of the seal member main body 21 and continuously extends in the peripheral direction Dc (see FIG. 1).
  • the inner circumferential groove portion 32 extends from the outer circumferential groove portion 31 toward the inner side in the radial direction Dr, and opens to the inner circumferential surface of the base portion 23 (in other words, the inner circumferential surface 21f of the seal member main body 21).
  • the outer circumferential groove portion 31 is formed to have a larger width dimension in the central axial direction Da than the inner circumferential groove portion 32.
  • the holding member 28 is accommodated in the outer peripheral groove portion 31.
  • the thin plate seal piece 27 has a distal end portion 27 b inside in the radial direction Dr protruding from the base portion 23 through the inner circumferential groove portion 32 inward in the radial direction Dr. Each thin plate seal piece 27 is held such that an angle formed with the outer peripheral surface of the rotor 102 with respect to the rotation direction of the rotor 102 is an acute angle.
  • a leaf spring 33 is provided outside the holding member 28 in the radial direction Dr.
  • the plate spring 33 urges each thin plate seal piece 27 toward the rotor 102 inside in the radial direction Dr.
  • each thin plate seal piece 27 contacts the rotor 102 with a predetermined preload.
  • the thin plate seal 25 floats from the rotor 102 by the distal end portion 27 b of the thin plate seal piece 27 being displaced radially outward by the dynamic pressure effect generated by the rotation of the rotor 102.
  • the thin plate seal piece 27 and the rotor 102 are brought into a non-contact state through a slight seal clearance. Thereby, wear of the thin plate seal piece 27 and the rotor 102 is prevented, and leakage of the working fluid (steam) from the high pressure region S2 toward the low pressure region S1 is suppressed.
  • the seal fin 26 is provided on the base portion 23 of the seal member main body 21.
  • a plurality of seal fins 26 are provided at intervals in the central axis direction Da of the rotor 102. Each seal fin 26 protrudes from the base portion 23 of the seal member main body 21 toward the inside in the radial direction Dr.
  • a plurality of seal fins 26 are provided on both sides of the central axis direction Da with the thin plate seal 25 interposed therebetween.
  • a labyrinth seal is formed on the high-pressure side and the low-pressure side of the thin plate seal 25 by these seal fins 26.
  • the seal segment 20 has a difference in fluid pressure between the low pressure region S1 and the high pressure region S2 on both sides in the central axis direction Da with respect to the seal segment 20 during rated operation.
  • the high-pressure fluid in the high-pressure region S ⁇ b> 2 flows through the notch 35 into the space 106 s between the pressure-receiving surface 22 f and the inner peripheral surface 106 g on the radially outer side of the housing recess 106.
  • the back pressure Ph that presses the pressure receiving surface 22f inward from the outside in the radial direction Dr is generated by the high-pressure fluid that has flowed in.
  • the seal member main body 21 moves closer to the rotor 102.
  • the clearance between the thin plate seal 25 and the seal fin 26 and the outer peripheral surface of the rotor 102 is reduced, and the high pressure region S2 and the low pressure region S1 are partitioned to exhibit a sealing function.
  • the shaft seal device 1 includes a foreign matter collection unit 50 ⁇ / b> A in the high-pressure region S ⁇ b> 2 upstream of the seal segment 20 as described above.
  • the foreign matter collection unit 50A has an annular shape that is disposed outside the rotor 102 in the radial direction Dr.
  • the foreign matter collection unit 50 ⁇ / b> A includes a casing 51 ⁇ / b> A, filter units 52 and 53, a foreign matter collection space 54, and a capturing member 55.
  • the casing 51 ⁇ / b> A of this embodiment is fixed to a side surface 104 s facing the high pressure side in the central axis direction Da of the housing 104 that holds the seal segment 20.
  • the casing 51A includes a pair of side wall portions 51a and 51b and an outer peripheral wall portion 51c.
  • the side wall 51 a is formed along the side surface 104 s of the housing 104.
  • the side wall 51b is formed to face the side wall 51a with a gap in the central axis direction Da.
  • the outer peripheral wall 51c connects the edges on the outer side in the radial direction Dr of the pair of side walls 51a and 51b.
  • the casing 51A has an introduction hole 51d that opens toward the rotor 102 inside the radial direction Dr.
  • the filter portion 52 is arranged inside the casing 51 ⁇ / b> A so as to close the introduction hole 51 d inside the radial direction Dr.
  • the filter unit 52 includes a plurality of openings 52h at intervals in the circumferential direction around the central axis of the rotor 102. These opening parts 52h penetrate the filter part 52 in the radial direction Dr, and communicate the space inside the filter part 52 and the space outside the filter part 52.
  • Each opening 52h is formed in a slit shape extending in the central axis direction Da connecting the side wall 51a and the side wall 51b of the casing 51A.
  • Each opening 52h is inclined with respect to the radial direction Dr of the rotor 102 from the upstream side to the downstream side in the rotational direction R of the rotor 102 as it goes from the inner side to the outer side in the radial direction Dr.
  • the inner end 52 j in the radial direction Dr that is closer to the rotor 102 faces the upstream side in the rotational direction R of the rotor 102.
  • the openings 52h are formed such that the opening width in the circumferential direction (in other words, the rotational direction R) gradually decreases from the inside toward the outside in the radial direction Dr.
  • the filter part 52 is provided with a recess 57 that is recessed radially inward on the outer peripheral surface facing radially outward.
  • the recess 57 is formed adjacent to the downstream side in the rotational direction R of the rotor 102 with respect to the radially outer end 52k of each opening 52h.
  • the recessed portion 57 has a rising wall 57 w that faces the radially outer side on the upstream side in the rotational direction R of the rotor 102.
  • the concave portion 57 captures foreign matter that has passed through the opening 52 h of the filter portion 52.
  • the filter part 53 is arranged with an interval outside the radial direction Dr with respect to the filter part 52.
  • the filter part 53 has an opening 53h that penetrates the inside and the outside in the radial direction Dr.
  • a plurality of openings 53 h are arranged in parallel at intervals in the central axis direction Da.
  • a plurality of openings 53 h arranged side by side in the central axis direction Da are provided at a plurality of locations at intervals in the circumferential direction around the central axis of the rotor 102.
  • Each opening 53 h is formed to extend in the radial direction Dr of the rotor 102.
  • the plurality of filter parts 52 and 53 have different diameters of the openings 52h and 53h. Specifically, the opening 53h of the filter unit 53 has a smaller inner diameter than the opening 52h of the filter unit 52 located inside the radial direction Dr.
  • the foreign matter collection space 54 is formed between the outer peripheral wall portion 51c and the filter portion 53 in the casing 51A.
  • the foreign matter collection space 54 collects foreign matter that has passed through the opening 52 h of the filter portion 52 and the opening 53 h of the filter portion 53.
  • a foreign matter discharge hole 58 may be formed in the outer peripheral wall portion 51 c of the casing 51 ⁇ / b> A located outside the foreign matter collection space 54 in the radial direction Dr.
  • the foreign matter discharge hole 58 discharges the foreign matter collected in the foreign matter collection space 54 to the outside of the casing 51A. Therefore, a vacuum device (not shown) or the like can be connected to the foreign matter discharge hole 58, and the foreign matter collected in the foreign matter collection space 54 can be sucked and collected.
  • the foreign material collection unit 50 ⁇ / b> A includes a capturing member 55 that captures foreign materials in the foreign material collection space 54.
  • the capturing member 55 is formed in a plate shape, and both ends in the central axis direction Da are fixed to the side wall 51a and the side wall 51b of the casing 51A.
  • the capturing member 55 is inclined in the radial direction Dr of the rotor 102 from the upstream side to the downstream side in the rotational direction R of the rotor 102 as it goes from the inner side to the outer side in the radial direction Dr.
  • Such a capturing member 55 can be formed from a metal plate, metal wool, or the like.
  • Such a capturing member 55 may be provided with a flange portion 59 extending toward the outer peripheral wall portion 51c at an edge portion on the radially outer side to collect foreign matter.
  • foreign matter that has entered the high-pressure region S2 between the rotor 102 and the stator 103 passes through the openings 52h and 53h of the filter parts 52 and 53 of the foreign matter recovery unit 50A, and the foreign matter recovery space 54 To be introduced.
  • the foreign matter is difficult to return to the high-pressure region S2 by passing through the openings 52h and 53h of the two-stage filter portions 52 and 53.
  • a part of the foreign matter that has passed through the opening 52h can be prevented from returning to the high-pressure region S2 through the opening 52h by entering the recess 57 formed in the filter portion 52.
  • Part of the foreign matter that has reached the foreign matter collection space 54 is captured by the capture member 55. Further, the foreign matter collected in the foreign matter collection space 54 is discharged to the outside through a foreign matter discharge hole 58 formed on the radially outer side of the casing 51A.
  • openings 52h and 53h are formed in the filter parts 52 and 53, and the foreign matter that has reached the foreign matter collection space 54 via the openings 52h and 53h is difficult to return to the high-pressure region S2.
  • the plurality of filter parts 52 and 53 are configured such that the diameters of the opening parts 52h and 53h are different from each other. As a result, the foreign matter that has reached the foreign matter collection space 54 via the openings 52h and 53h is more difficult to return to the high-pressure region S2.
  • the catching member 55 by capturing the foreign matter collected in the foreign matter collection space 54 with the catching member 55, it is possible to reduce the return of the foreign matter to the high pressure region S2. Furthermore, the foreign matter that has passed through the opening 52h of the filter portion 52 enters the concave portion 57, so that the foreign matter can be prevented from returning to the high-pressure region S2 through the opening 52h.
  • the opening 52 h is inclined so that the radially inner side facing the rotor 102 side faces the upstream side in the rotational direction of the rotor 102.
  • the foreign matter discharge hole 58 for discharging the collected foreign matter is provided in the foreign matter collection space 54, it takes time to clean and replace the foreign matter collection unit 50A due to accumulation of foreign matter collected by the foreign matter collection unit 50A. Absent.
  • FIG. 5 is a cross-sectional view showing a configuration of a first modification of the shaft seal device.
  • the foreign material recovery unit 50B is provided so that the inner peripheral end 51s protrudes further inward in the radial direction Dr with respect to the foreign material recovery unit 50A described above.
  • the foreign material recovery part 50B opens the introduction hole 60 for introducing the foreign material into the casing 51B so as to face the upstream side in the central axis direction Da.
  • the foreign matter collection unit 50B includes a casing 51B, filter units 52 and 53, a foreign matter collection space 54, and a capturing member 55.
  • the casing 51 ⁇ / b> B is fixed to a side surface 104 s facing the high pressure side in the central axis direction Da in the housing 104 that holds the seal segment 20, and an inner peripheral end 51 s inside the radial direction Dr is close to the outer peripheral surface of the rotor 102.
  • the rotor 102 is provided to face the outer peripheral surface.
  • the casing 51B has a pair of side wall portions 51e and 51f, an outer peripheral wall portion 51g, and an inner peripheral wall portion 51h.
  • the side wall 51 e is formed along the side surface 104 s of the housing 104.
  • the side wall part 51f is provided to face the side wall part 51e with an interval in the central axis direction Da.
  • the outer peripheral wall 51g connects the ends on the outer side in the radial direction Dr of the pair of side walls 51e and 51f.
  • the inner peripheral wall portion 51h connects ends of the pair of side wall portions 51e and 51f on the inner side in the radial direction Dr.
  • an introduction hole 60 that communicates the inside and outside of the casing 51B is formed in a side wall 51f that faces the upstream side in the central axis direction Da.
  • the filter parts 52 and 53 are disposed inside the casing 51B and outside the introduction hole 60 in the radial direction Dr.
  • foreign matter that has entered the high pressure region S2 between the rotor 102 and the stator 103 is introduced into the casing 51B through the introduction hole 60.
  • This foreign matter is introduced into the foreign matter collection space 54 outside the radial direction Dr through the openings 52h and 53h of the filter portions 52 and 53 in the casing 51B.
  • FIG. 6 is a cross-sectional view showing a configuration of a second modification of the shaft seal device.
  • the foreign material recovery part 50 ⁇ / b> C may be provided on the outer peripheral end part 110 s of the flow path 110 extending from the inside in the radial direction Dr to the outside on the upstream side of the seal segment 20.
  • the foreign material recovery unit 50C includes a casing 51C, filter units 52 and 53, a foreign material recovery space 54, and a capturing member 55, as in the above embodiment.
  • the casing 51C includes a pair of side wall portions 51a and 51b and an outer peripheral wall portion 51c, and has an introduction hole 51d that opens toward the rotor 102 inside the radial direction Dr, like the casing 51A of the above embodiment. ing.
  • the casing 51C is fixed to the stator 103 at the outer peripheral end 110s of the flow path 110 extending from the inner side to the outer side in the radial direction Dr.
  • the introduction hole 51d is opened toward the inside of the flow path 110 in the radial direction Dr.
  • foreign matter that has entered the high pressure region S2 between the rotor 102 and the stator 103 flows along the flow path 110 from the inside to the outside in the radial direction Dr.
  • the foreign matter that has moved along the flow path 110 is introduced into the casing 51C from the opening 52h of the filter portion 52 formed in the introduction hole 51d.
  • the foreign matter introduced into the casing 51C is collected in the foreign matter collection space 54 through the openings 52h and 53h of the filter portions 52 and 53.
  • the foreign material can be collected by the foreign material collecting unit 50C provided on the upstream side of the seal segment 20 as in the above embodiment. Therefore, the thin plate seal 25 can be reduced from being affected by foreign matter. Furthermore, since the introduction hole 51d opens in a direction opposite to the flow path 110 extending from the inside to the outside in the radial direction Dr, that is, in the direction in which the foreign material flows, the foreign material is efficiently guided into the casing 51C. It becomes possible to collect.
  • the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
  • the foreign matter collecting units 50A to 50C include the two filter units 52 and 53, but may include only one or three or more filter units.
  • the foreign matter collecting unit 50C includes two types of filter units 52 and 53 having different configurations of the openings 52h and 53h, but may include only one type or three or more types of filter units.
  • the foreign material collection space 54 is provided with the capturing member 55, any other configuration may be used as long as the foreign material can be collected in the foreign material collection space 54. Furthermore, a configuration without the capturing member 55 is also possible.
  • the foreign matter collecting parts 50A to 50C can be attached to and detached from the stator 103 or the housing 104, and the foreign matter collecting parts 50A to 50C are removed to remove foreign matter accumulated in the foreign matter collecting space 54 in another state or to collect new foreign matter collected. It may be exchanged with the parts 50A to 50C.
  • the shaft seal device 1 is provided with the thin plate seal 25 and the seal fin 26.
  • the seal function can be exhibited between the high pressure region S2 and the low pressure region S1, other seals are appropriately used.
  • a structure may be adopted.
  • the shaft seal device 1 according to the embodiment and the modification can be applied to a rotary machine other than a steam turbine or a gas turbine.
  • the present invention provides a shaft seal device provided between a rotor and a stator surrounding the rotor, and partitions a space between the rotor and the stator into a high pressure region and a low pressure region in the central axis direction of the rotor, and the shaft seal device It is applicable to a rotating machine equipped with According to this invention, it is possible to reduce the influence of foreign matter on the seal body.

Abstract

This shaft seal device (1) is provided between a rotor and a stator surrounding the rotor, and partitions a space between the rotor and the stator into a high-pressure region (S2) and a low-pressure region in the direction (Da) of the central axis of the rotor. The shaft seal device (1) is provided with a seal segment (20) and a foreign matter recovery part (50A). The seal segment (20) is fixed to the stator, and protrudes towards the rotor. The foreign matter recovery part (50A) is provided in the high-pressure region (S2) upstream of the seal segment (20), and has a foreign matter recovery space (54) formed therein. An introduction hole (51d) for introducing foreign matter in the high-pressure region (S2) into the foreign matter recovery space (54) is formed in the foreign matter recovery part (50A).

Description

軸シール装置、回転機械Shaft seal device, rotating machine
　この発明は、軸シール装置、回転機械に関する。
　本願は、２０１７年３月２３日に、日本に出願された特願２０１７－５７９９１号に基づき優先権を主張し、その内容をここに援用する。 The present invention relates to a shaft seal device and a rotary machine.
This application claims priority based on Japanese Patent Application No. 2017-57991 filed in Japan on March 23, 2017, the contents of which are incorporated herein by reference.
　ガスタービン、蒸気タービン等の回転機械は、ロータの周囲で高圧側から低圧側に流れる作動流体の漏れ量を少なくするために、軸シール装置を備えている。軸シール装置は、ロータの周囲の高圧領域と低圧領域とを仕切るシール部材を備えている。 Rotating machines such as gas turbines and steam turbines are provided with a shaft seal device in order to reduce the amount of leakage of working fluid flowing from the high pressure side to the low pressure side around the rotor. The shaft seal device includes a seal member that partitions a high pressure region and a low pressure region around the rotor.
　回転機械においては、回転機械の上流側より配管スケール等の異物が侵入する場合がある。この異物は、シール部材においてロータの外周面に対向するように設けられたシール体に到達する可能性がある。シール体は、このように異物が到達することによって影響を受け、そのシール性能が変化する場合がある。 In a rotating machine, foreign matters such as piping scales may enter from the upstream side of the rotating machine. There is a possibility that the foreign matter reaches a seal body provided to face the outer peripheral surface of the rotor in the seal member. The seal body is affected by the arrival of foreign matter in this way, and the seal performance may change.
　これに対し、特許文献１には、シール体の上流側にブラシシールを備えた構成が開示されている。ブラシシールは、ロータの径方向外側に設けられた支持部と、支持部から径方向内側に突出する多数のワイヤとから構成されている。このようなブラシシールをシール体の上流側に設けることで、シール体への異物の流入を抑制することができる。 On the other hand, Patent Document 1 discloses a configuration including a brush seal on the upstream side of the seal body. The brush seal is composed of a support portion provided on the radially outer side of the rotor and a number of wires projecting radially inward from the support portion. By providing such a brush seal on the upstream side of the seal body, the inflow of foreign matter to the seal body can be suppressed.
特許第５８５１８９０号公報Japanese Patent No. 585890
　特許文献１に記載されたブラシシールは、長期間にわたる使用にともなってワイヤが摩耗する場合がある。ブラシシールのワイヤが摩耗すると、異物が捕捉できず、シール体への異物の流入の抑制効果が低くなる場合がある。
　この発明は、シール体の上流側で異物を捕捉し、シール体への異物の影響を低減させることができる軸シール装置、回転機械を提供することを目的とする。 In the brush seal described in Patent Document 1, there is a case where the wire is worn with long-term use. When the wire of the brush seal is worn, foreign matter cannot be captured, and the effect of suppressing the inflow of foreign matter to the seal body may be reduced.
An object of the present invention is to provide a shaft seal device and a rotary machine that can capture foreign matter on the upstream side of a seal body and reduce the influence of the foreign matter on the seal body.
　この発明の第一態様によれば、軸シール装置は、ロータと前記ロータを囲うステータとの間に設けられて、前記ロータと前記ステータとの間の空間を前記ロータの中心軸方向において高圧領域と低圧領域とに仕切る。前記軸シール装置は、シール部と、異物回収部と、を備える。シール部は、前記ステータに固定され、前記ロータに向かって突出する。異物回収部は、前記シール部の上流側の高圧領域に設けられて、内部に異物回収空間が形成されている。異物回収部には、前記高圧領域の異物を前記異物回収空間に導入する導入孔が形成されている。 According to the first aspect of the present invention, the shaft seal device is provided between the rotor and the stator surrounding the rotor, and a space between the rotor and the stator is a high pressure region in the central axis direction of the rotor. And the low pressure area. The shaft seal device includes a seal portion and a foreign matter collection portion. The seal portion is fixed to the stator and protrudes toward the rotor. The foreign matter recovery part is provided in a high pressure region upstream of the seal part, and a foreign matter recovery space is formed therein. In the foreign matter collection part, an introduction hole for introducing foreign matter in the high pressure region into the foreign matter collection space is formed.
　このように構成することで、ロータとステータとの間の空間に侵入した異物は、異物回収部の導入孔から異物回収空間に導入される。このようにして、シール部の上流側に設けられた異物回収部で異物を回収することで、異物がシール体に到達することを抑制する。 With this configuration, the foreign matter that has entered the space between the rotor and the stator is introduced into the foreign matter collection space from the introduction hole of the foreign matter collection section. In this way, the foreign matter is collected by the foreign matter collecting portion provided on the upstream side of the seal portion, thereby suppressing the foreign matter from reaching the seal body.
　この発明の第二態様によれば、第一態様に係る異物回収部は、前記異物が通過する開口部を複数有したフィルター部をさらに備えるようにしてもよい。
　このように構成することで、導入孔から異物回収空間に導入される異物は、フィルター部の開口部を通過することで、高圧領域に戻り難くなる。 According to the second aspect of the present invention, the foreign matter collecting part according to the first aspect may further include a filter part having a plurality of openings through which the foreign matter passes.
With this configuration, the foreign matter introduced into the foreign matter collection space from the introduction hole is unlikely to return to the high pressure region by passing through the opening of the filter portion.
　この発明の第三態様によれば、第二態様に係る異物回収部は、前記フィルター部を複数備え、複数の前記フィルター部は、前記開口部の径が互いに異なるようにしてもよい。
　このように構成することで、導入孔から異物回収空間に導入される異物が、より一層高圧領域に戻り難くなる。 According to the third aspect of the present invention, the foreign matter recovery part according to the second aspect may include a plurality of the filter parts, and the plurality of filter parts may have different diameters of the openings.
By comprising in this way, the foreign material introduce | transduced into a foreign material collection | recovery space from an introduction hole becomes difficult to return to a high pressure area | region further.
　この発明の第四態様によれば、第二又は第三態様に係る導入孔は、径方向内側を向いて開口し、前記フィルター部は、前記導入孔の前記径方向内側を塞ぐように配置され、前記フィルター部の前記開口部は、少なくとも前記径方向内側で前記ロータの回転方向上流側を向いて開口するように傾斜していてもよい。
　このように構成することで、ロータの回転にともなってロータ回りに旋回しながら高圧領域から低圧領域に向かって流れる異物を、フィルター部の開口部から異物回収空間に導き易くなる。 According to the fourth aspect of the present invention, the introduction hole according to the second or third aspect opens toward the radially inner side, and the filter portion is disposed so as to close the radially inner side of the introduction hole. The opening portion of the filter portion may be inclined so as to open toward the upstream side in the rotational direction of the rotor at least on the radially inner side.
With this configuration, it becomes easy to guide foreign matter flowing from the high pressure region toward the low pressure region while turning around the rotor as the rotor rotates, from the opening of the filter portion to the foreign matter collection space.
　この発明の第五態様によれば、第二から第四態様の何れか一つの態様に係るフィルター部は、径方向外側を向く外周面に、径方向内側に向かって窪む凹部を有していてもよい。　このように構成することで、フィルター部の開口部を通過した異物が凹部に入り込むと、この異物は、開口部を通して高圧領域に戻り難くなる。 According to the fifth aspect of the present invention, the filter portion according to any one of the second to fourth aspects has a concave portion that is recessed toward the radially inner side on the outer peripheral surface facing the radially outer side. May be. With this configuration, when foreign matter that has passed through the opening of the filter portion enters the recess, the foreign matter is unlikely to return to the high-pressure region through the opening.
　この発明の第六態様によれば、第一から第五態様の何れか一つの態様に係る導入孔は、軸方向高圧側または径方向内側を向いていてもよい。
　このように構成することで、異物が流れてくる方向に導入孔を開口させ、異物を効率良く異物回収部に導くことができる。 According to the sixth aspect of the present invention, the introduction hole according to any one of the first to fifth aspects may face the axial high-pressure side or the radial inner side.
With this configuration, the introduction hole can be opened in the direction in which the foreign material flows, and the foreign material can be efficiently guided to the foreign material recovery unit.
　この発明の第七態様によれば、第一から第六態様の何れか一つの態様に係る軸シール装置は、前記異物回収空間に、前記異物を捕捉する捕捉部材が設けられていてもよい。
　このように構成することで、異物回収空間で回収した異物を捕捉部材で捕捉して、異物が高圧領域に戻ることを抑制できる。 According to the seventh aspect of the present invention, in the shaft seal device according to any one of the first to sixth aspects, a capturing member that captures the foreign material may be provided in the foreign material recovery space.
By comprising in this way, it can suppress that the foreign material collect | recovered in the foreign material collection | recovery space is capture | acquired with a capture member, and a foreign material returns to a high voltage | pressure area | region.
　この発明の第八態様によれば、第一から第七態様の何れか一つの態様に係る軸シール装置は、前記異物回収空間に回収された前記異物を排出する異物排出孔をさらに有していてもよい。
　このように構成することで、異物回収空間で回収した異物を回収することができる。これによって、異物回収部で回収した異物が溜まったときに、異物回収部を清掃したり交換したりする手間が掛からない。 According to the eighth aspect of the present invention, the shaft seal device according to any one of the first to seventh aspects further includes a foreign matter discharge hole for discharging the foreign matter collected in the foreign matter collection space. May be.
By comprising in this way, the foreign material collect | recovered in the foreign material collection | recovery space can be collect | recovered. Thus, when the foreign matter collected by the foreign matter collecting unit is accumulated, it is not necessary to clean and replace the foreign matter collecting unit.
　この発明の第九態様によれば、回転機械は、第一から第八態様の何れか一つの態様における軸シール装置を備える。
　このように構成することで、シール部の上流側に設けられた異物回収部で異物を回収し、異物によってシール体が影響を受けることを抑制できる。 According to the ninth aspect of the present invention, the rotary machine includes the shaft seal device according to any one of the first to eighth aspects.
By comprising in this way, a foreign material is collect | recovered by the foreign material collection | recovery part provided in the upstream of the seal part, and it can suppress that a seal body is influenced by a foreign material.
　上記軸シール装置、回転機械によれば、シール体の上流側で異物を回収し、シール体への異物の影響を低減させることができる。 According to the shaft seal device and the rotary machine, foreign matter can be collected on the upstream side of the seal body, and the influence of the foreign matter on the seal body can be reduced.
この発明の一実施形態における、回転機械に設けられた軸シール装置の構成を、ロータの中心軸方向から見た図である。It is the figure which looked at the structure of the shaft seal apparatus provided in the rotary machine in one Embodiment of this invention from the center axis direction of the rotor. 上記軸シール装置の実施形態における構成を示す図であり、図１のＸ－Ｘ線に沿う断面図である。It is a figure which shows the structure in embodiment of the said shaft seal apparatus, and is sectional drawing which follows the XX line of FIG. 上記軸シール装置に設けられた異物回収部の構成を示す断面図である。It is sectional drawing which shows the structure of the foreign material collection | recovery part provided in the said shaft seal apparatus. 上記異物回収部の構成を示す図であり、図３のＹ－Ｙ線に沿う断面図である。FIG. 4 is a diagram showing a configuration of the foreign matter collection unit, and is a cross-sectional view taken along line YY of FIG. 上記軸シール装置の第１変形例の構成を示す断面図である。It is sectional drawing which shows the structure of the 1st modification of the said shaft seal apparatus. 上記軸シール装置の第２変形例の構成を示す断面図である。It is sectional drawing which shows the structure of the 2nd modification of the said shaft seal apparatus.
　以下、この発明の一実施形態における軸シール装置、回転機械を図面に基づいて説明する。
　図１は、この発明の一実施形態における回転機械に設けられた軸シール装置の構成を、ロータの中心軸方向から見た図である。図２は、図１のＸ－Ｘ線に沿う断面図である。図３は、上記軸シール装置に設けられた異物回収部の構成を示す断面図である。図４は、上記異物回収部の構成を示す図であり、図３のＹ－Ｙ線に沿う断面図である。
　図１、図２に示すように、蒸気タービンやガスタービン等の回転機械１００は、その車室（図示無し）に取り付けられたステータ１０３と、ステータ１０３の径方向Ｄｒの内側に配置され、軸受（図示無し）によって回転自在に設けられたロータ１０２と、を備えている。 Hereinafter, a shaft seal device and a rotary machine according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a view of the configuration of a shaft seal device provided in a rotary machine according to an embodiment of the present invention, viewed from the direction of the central axis of a rotor. FIG. 2 is a sectional view taken along line XX in FIG. FIG. 3 is a cross-sectional view showing the configuration of the foreign matter recovery unit provided in the shaft seal device. FIG. 4 is a diagram showing the configuration of the foreign matter collection unit, and is a cross-sectional view taken along line YY of FIG.
As shown in FIGS. 1 and 2, a rotary machine 100 such as a steam turbine or a gas turbine is provided with a stator 103 attached to a passenger compartment (not shown) thereof and an inner side of the stator 103 in the radial direction Dr. And a rotor 102 provided rotatably (not shown).
　軸シール装置１は、ロータ１０２とステータ１０３との間の環状空間に設けられている。
　図２に示すように、軸シール装置１は、環状空間を、ロータ１０２の中心軸方向Ｄａの第一の側に形成された低圧領域Ｓ１と、中心軸方向Ｄａの第二の側に形成された高圧領域Ｓ２とを区分する。 The shaft seal device 1 is provided in an annular space between the rotor 102 and the stator 103.
As shown in FIG. 2, the shaft sealing device 1 has an annular space formed on the low pressure region S <b> 1 formed on the first side in the central axial direction Da of the rotor 102 and on the second side in the central axial direction Da. And the high pressure region S2.
　図１に示すように、軸シール装置１は、円弧状に延びる複数（本実施形態では８つ）のシールセグメント（シールリング片）２０を備えている。複数のシールセグメント（シールリング片）２０は、周方向Ｄｃに環状に配置されている。軸シール装置１は、これら８つのシールセグメント２０を周方向Ｄｃに配置することで、全体として円環状のシールリング５を構成している。即ち、軸シール装置１のシールリング５は、ロータ１０２の周方向Ｄｃに複数に分割されたような構造となっている。 As shown in FIG. 1, the shaft seal device 1 includes a plurality (eight in this embodiment) of seal segments (seal ring pieces) 20 extending in an arc shape. The plurality of seal segments (seal ring pieces) 20 are annularly arranged in the circumferential direction Dc. The shaft seal device 1 constitutes an annular seal ring 5 as a whole by arranging these eight seal segments 20 in the circumferential direction Dc. That is, the seal ring 5 of the shaft seal device 1 has a structure that is divided into a plurality of portions in the circumferential direction Dc of the rotor 102.
　図２に示すように、シールセグメント２０は、ステータ１０３の径方向Ｄｒの内側に設けられたハウジング１０４に保持されている。ハウジング１０４には、ロータ１０２の中心軸周りの周方向Ｄｃに連続して延びる溝１０５が形成されている。
　溝１０５は、収容凹部１０６と、連通部１０７と、を有している。収容凹部１０６は、断面矩形状に形成されている。連通部１０７は、収容凹部１０６とハウジング１０４の内周面１０４ｆとを連通する。連通部１０７に対し、中心軸方向Ｄａの両側には、収容凹部１０６の内壁面１０６ａよりも中心軸方向Ｄａの内側に向かって突出する突出部１０８がそれぞれ形成されている。これら突出部１０８により、連通部１０７は、中心軸方向Ｄａの開口寸法が、収容凹部１０６の中心軸方向Ｄａの幅寸法よりも小さくなっている。 As shown in FIG. 2, the seal segment 20 is held by a housing 104 provided inside the stator 103 in the radial direction Dr. The housing 104 is formed with a groove 105 extending continuously in the circumferential direction Dc around the central axis of the rotor 102.
The groove 105 has an accommodation recess 106 and a communication portion 107. The accommodating recess 106 is formed in a rectangular cross section. The communication portion 107 communicates the accommodating recess 106 with the inner peripheral surface 104 f of the housing 104. Protruding portions 108 are formed on both sides of the communication portion 107 in the central axis direction Da so as to protrude from the inner wall surface 106a of the housing recess 106 toward the inside of the central axis direction Da. Due to these protrusions 108, the communication portion 107 has an opening dimension in the central axis direction Da smaller than a width dimension in the central axial direction Da of the housing recess 106.
　シールセグメント２０は、シール部材本体２１と、薄板シール（シール体）２５と、シールフィン（シール体）２６と、を備えている。 The seal segment 20 includes a seal member main body 21, a thin plate seal (seal body) 25, and a seal fin (seal body) 26.
　シール部材本体２１は、受圧部２２と、ベース部２３と、連結部２４と、を一体に備えている。 The seal member body 21 is integrally provided with a pressure receiving portion 22, a base portion 23, and a connecting portion 24.
　受圧部２２は、収容凹部１０６内に収容されている。受圧部２２の径方向Ｄｒの外側には、受圧面２２ｆが形成されている。
　ここで、シール部材本体２１は、周方向Ｄｃに間隔をあけた複数個所に、切欠き３５を備えている。これら切欠き３５は、受圧面２２ｆと収容凹部１０６の径方向Ｄｒの外側に位置する内周面１０６ｇとの間の空間１０６ｓと、高圧領域Ｓ２とを連通する。 The pressure receiving portion 22 is housed in the housing recess 106. A pressure receiving surface 22 f is formed outside the pressure receiving portion 22 in the radial direction Dr.
Here, the seal member main body 21 includes notches 35 at a plurality of locations spaced in the circumferential direction Dc. These notches communicate the space 106 s between the pressure receiving surface 22 f and the inner peripheral surface 106 g located outside the radial direction Dr of the housing recess 106 and the high pressure region S <b> 2.
　ベース部２３は、ハウジング１０４の内周面１０４ｆよりも径方向Ｄｒ内側に配置されている。ベース部２３は、その中心軸方向Ｄａの幅寸法が、連通部１０７の中心軸方向Ｄａの幅寸法よりも大きくなっている。
　連結部２４は、連通部１０７を通して受圧部２２とベース部２３とを連結している。 The base portion 23 is disposed on the inner side in the radial direction Dr from the inner peripheral surface 104 f of the housing 104. The width dimension of the base portion 23 in the central axis direction Da is larger than the width dimension of the communication portion 107 in the central axis direction Da.
The connecting part 24 connects the pressure receiving part 22 and the base part 23 through the communication part 107.
　薄板シール２５は、ロータ１０２の周方向Ｄｃに互いに微少間隔を開けて多重に配列された複数枚の金属製の薄板シール片２７を備える。複数枚の薄板シール片２７は、径方向Ｄｒ外側の基端部２７ａが、例えば溶接によって互いに固定されている。これら複数枚の薄板シール片２７は、径方向Ｄｒの外側の基端部２７ａが、保持部材２８を介し、シール部材本体２１に形成された凹溝３０に保持されている。 The thin plate seal 25 includes a plurality of metal thin plate seal pieces 27 arranged in a multiple manner with a minute interval in the circumferential direction Dc of the rotor 102. In the plurality of thin plate seal pieces 27, the base end portions 27a outside the radial direction Dr are fixed to each other by welding, for example. The plurality of thin plate seal pieces 27 are held at the concave end 30 formed in the seal member main body 21 through the holding member 28 at the base end portion 27a outside in the radial direction Dr.
　凹溝３０は、外周溝部３１と、内周溝部３２と、を備えている。外周溝部３１は、シール部材本体２１の径方向Ｄｒの中間部に形成され、周方向Ｄｃ（図１参照）に連続して延びている。内周溝部３２は、外周溝部３１から径方向Ｄｒの内側に向かって延び、ベース部２３の内周面（言い換えれば、シール部材本体２１の内周面２１ｆ）に開口している。外周溝部３１は、内周溝部３２よりも、中心軸方向Ｄａの幅寸法が大きく形成されている。保持部材２８は、この外周溝部３１内に収容されている。薄板シール片２７は、その径方向Ｄｒの内側の先端部２７ｂが、内周溝部３２を通してベース部２３から径方向Ｄｒの内側に突出している。各薄板シール片２７は、ロータ１０２の回転方向に対してロータ１０２の外周面となす角が鋭角となるよう保持されている。 The concave groove 30 includes an outer peripheral groove portion 31 and an inner peripheral groove portion 32. The outer peripheral groove portion 31 is formed at an intermediate portion in the radial direction Dr of the seal member main body 21 and continuously extends in the peripheral direction Dc (see FIG. 1). The inner circumferential groove portion 32 extends from the outer circumferential groove portion 31 toward the inner side in the radial direction Dr, and opens to the inner circumferential surface of the base portion 23 (in other words, the inner circumferential surface 21f of the seal member main body 21). The outer circumferential groove portion 31 is formed to have a larger width dimension in the central axial direction Da than the inner circumferential groove portion 32. The holding member 28 is accommodated in the outer peripheral groove portion 31. The thin plate seal piece 27 has a distal end portion 27 b inside in the radial direction Dr protruding from the base portion 23 through the inner circumferential groove portion 32 inward in the radial direction Dr. Each thin plate seal piece 27 is held such that an angle formed with the outer peripheral surface of the rotor 102 with respect to the rotation direction of the rotor 102 is an acute angle.
　保持部材２８の径方向Ｄｒの外側には、板バネ３３が設けられている。板バネ３３は、各薄板シール片２７を径方向Ｄｒの内側のロータ１０２に向かって付勢する。 A leaf spring 33 is provided outside the holding member 28 in the radial direction Dr. The plate spring 33 urges each thin plate seal piece 27 toward the rotor 102 inside in the radial direction Dr.
　このような薄板シール２５は、ロータ１０２の停止時に、各薄板シール片２７の先端部２７ｂが、所定の予圧でロータ１０２に接触する。薄板シール２５は、ロータ１０２の回転時に、ロータ１０２が回転することで生じる動圧効果によって、薄板シール片２７の先端部２７ｂが径方向外側に変位してロータ１０２から浮上する。その結果、薄板シール片２７とロータ１０２とが僅かなシールクリアランスを介して非接触状態となる。これにより、薄板シール片２７及びロータ１０２の磨耗が防止されるとともに高圧領域Ｓ２から低圧領域Ｓ１に向かっての作動流体（蒸気）の漏洩が抑制される。 In such a thin plate seal 25, when the rotor 102 is stopped, the leading end portion 27b of each thin plate seal piece 27 contacts the rotor 102 with a predetermined preload. When the rotor 102 rotates, the thin plate seal 25 floats from the rotor 102 by the distal end portion 27 b of the thin plate seal piece 27 being displaced radially outward by the dynamic pressure effect generated by the rotation of the rotor 102. As a result, the thin plate seal piece 27 and the rotor 102 are brought into a non-contact state through a slight seal clearance. Thereby, wear of the thin plate seal piece 27 and the rotor 102 is prevented, and leakage of the working fluid (steam) from the high pressure region S2 toward the low pressure region S1 is suppressed.
　シールフィン２６は、シール部材本体２１のベース部２３に設けられている。シールフィン２６は、ロータ１０２の中心軸方向Ｄａに互いに間隔をあけて複数設けられている。各シールフィン２６は、シール部材本体２１のベース部２３から、径方向Ｄｒの内側に向かって突出している。シールフィン２６は、薄板シール２５を挟んで、中心軸方向Ｄａの両側にそれぞれ複数設けられている。これらのシールフィン２６によって、薄板シール２５の高圧側及び低圧側にラビリンスシールが構成されている。 The seal fin 26 is provided on the base portion 23 of the seal member main body 21. A plurality of seal fins 26 are provided at intervals in the central axis direction Da of the rotor 102. Each seal fin 26 protrudes from the base portion 23 of the seal member main body 21 toward the inside in the radial direction Dr. A plurality of seal fins 26 are provided on both sides of the central axis direction Da with the thin plate seal 25 interposed therebetween. A labyrinth seal is formed on the high-pressure side and the low-pressure side of the thin plate seal 25 by these seal fins 26.
　シールセグメント２０は、定格運転時においては、シールセグメント２０に対して中心軸方向Ｄａの両側の低圧領域Ｓ１と高圧領域Ｓ２とで流体の圧力に差が生じる。図２に示すように、高圧領域Ｓ２の高圧流体は、切欠き３５を通して、受圧面２２ｆと収容凹部１０６の径方向外側の内周面１０６ｇとの間の空間１０６ｓに流れ込む。すると、図１に示すように、流れ込んだ高圧流体によって、受圧面２２ｆを径方向Ｄｒの外側から内側に向かって押圧する背面圧力Ｐｈが生じる。この背面圧力Ｐｈによって、シール部材本体２１はロータ１０２に近い側に移動する。これにより、薄板シール２５及びシールフィン２６とロータ１０２の外周面との間のクリアランスが減少し、高圧領域Ｓ２と低圧領域Ｓ１とが仕切られてシール機能が発現する。 The seal segment 20 has a difference in fluid pressure between the low pressure region S1 and the high pressure region S2 on both sides in the central axis direction Da with respect to the seal segment 20 during rated operation. As shown in FIG. 2, the high-pressure fluid in the high-pressure region S <b> 2 flows through the notch 35 into the space 106 s between the pressure-receiving surface 22 f and the inner peripheral surface 106 g on the radially outer side of the housing recess 106. Then, as shown in FIG. 1, the back pressure Ph that presses the pressure receiving surface 22f inward from the outside in the radial direction Dr is generated by the high-pressure fluid that has flowed in. With this back pressure Ph, the seal member main body 21 moves closer to the rotor 102. As a result, the clearance between the thin plate seal 25 and the seal fin 26 and the outer peripheral surface of the rotor 102 is reduced, and the high pressure region S2 and the low pressure region S1 are partitioned to exhibit a sealing function.
　図２に示すように、軸シール装置１は、上記したようなシールセグメント２０に対して上流側の高圧領域Ｓ２に、異物回収部５０Ａを備えている。
　異物回収部５０Ａは、ロータ１０２に対して径方向Ｄｒの外側に配置された円環状をなしている。
　図３、図４に示すように、異物回収部５０Ａは、ケーシング５１Ａと、フィルター部５２，５３と、異物回収空間５４と、捕捉部材５５と、を備えている。 As shown in FIG. 2, the shaft seal device 1 includes a foreign matter collection unit 50 </ b> A in the high-pressure region S <b> 2 upstream of the seal segment 20 as described above.
The foreign matter collection unit 50A has an annular shape that is disposed outside the rotor 102 in the radial direction Dr.
As shown in FIGS. 3 and 4, the foreign matter collection unit 50 </ b> A includes a casing 51 </ b> A, filter units 52 and 53, a foreign matter collection space 54, and a capturing member 55.
　図３に示すように、この実施形態のケーシング５１Ａは、シールセグメント２０を保持するハウジング１０４の中心軸方向Ｄａにおける高圧側を向く側面１０４ｓに固定されている。ケーシング５１Ａは、一対の側壁部５１ａ，５１ｂと、外周壁部５１ｃと、を備えている。 As shown in FIG. 3, the casing 51 </ b> A of this embodiment is fixed to a side surface 104 s facing the high pressure side in the central axis direction Da of the housing 104 that holds the seal segment 20. The casing 51A includes a pair of side wall portions 51a and 51b and an outer peripheral wall portion 51c.
　側壁部５１ａは、ハウジング１０４の側面１０４ｓに沿うように形成されている。側壁部５１ｂは、側壁部５１ａに対し、中心軸方向Ｄａに間隔をあけて対向するように形成されている。外周壁部５１ｃは、これら一対の側壁部５１ａ，５１ｂの径方向Ｄｒ外側の縁部同士を連結する。そして、ケーシング５１Ａは、径方向Ｄｒ内側のロータ１０２側に向かって開口する導入孔５１ｄを有している。 The side wall 51 a is formed along the side surface 104 s of the housing 104. The side wall 51b is formed to face the side wall 51a with a gap in the central axis direction Da. The outer peripheral wall 51c connects the edges on the outer side in the radial direction Dr of the pair of side walls 51a and 51b. The casing 51A has an introduction hole 51d that opens toward the rotor 102 inside the radial direction Dr.
　図３、図４に示すように、フィルター部５２は、ケーシング５１Ａの内側で、径方向Ｄｒ内側の導入孔５１ｄを塞ぐように配置されている。フィルター部５２は、ロータ１０２の中心軸回りの周方向に間隔をあけて複数の開口部５２ｈを備えている。これら開口部５２ｈは、フィルター部５２を径方向Ｄｒに貫通し、フィルター部５２よりも内側の空間とフィルター部５２よりも外側の空間とを連通している。 As shown in FIGS. 3 and 4, the filter portion 52 is arranged inside the casing 51 </ b> A so as to close the introduction hole 51 d inside the radial direction Dr. The filter unit 52 includes a plurality of openings 52h at intervals in the circumferential direction around the central axis of the rotor 102. These opening parts 52h penetrate the filter part 52 in the radial direction Dr, and communicate the space inside the filter part 52 and the space outside the filter part 52.
　各開口部５２ｈは、ケーシング５１Ａの側壁部５１ａと側壁部５１ｂとを結ぶ中心軸方向Ｄａに延びるスリット状に形成されている。各開口部５２ｈは、ロータ１０２の径方向Ｄｒに対し、径方向Ｄｒの内側から外側に向かうに従って、ロータ１０２の回転方向Ｒの上流側から下流側に向かうように傾斜している。これにより、各開口部５２ｈは、ロータ１０２に近い側である径方向Ｄｒの内側の端部５２ｊが、ロータ１０２の回転方向Ｒの上流側を向いている。これら開口部５２ｈは、径方向Ｄｒの内側から外側に向かうに従って、周方向（言い換えれば、回転方向Ｒ）の開口幅が漸次小さくなるよう形成されている。 Each opening 52h is formed in a slit shape extending in the central axis direction Da connecting the side wall 51a and the side wall 51b of the casing 51A. Each opening 52h is inclined with respect to the radial direction Dr of the rotor 102 from the upstream side to the downstream side in the rotational direction R of the rotor 102 as it goes from the inner side to the outer side in the radial direction Dr. Thus, in each opening 52 h, the inner end 52 j in the radial direction Dr that is closer to the rotor 102 faces the upstream side in the rotational direction R of the rotor 102. The openings 52h are formed such that the opening width in the circumferential direction (in other words, the rotational direction R) gradually decreases from the inside toward the outside in the radial direction Dr.
　フィルター部５２は、径方向外側を向く外周面に、径方向内側に向かって窪む凹部５７を備えている。この凹部５７は、各開口部５２ｈの径方向外側の端部５２ｋに対し、ロータ１０２の回転方向Ｒの下流側に隣接して形成されている。凹部５７は、ロータ１０２の回転方向Ｒの上流側に径方向外側に立ち当たる立ち上がり壁５７ｗを有している。この凹部５７は、フィルター部５２の開口部５２ｈを通過した異物を捕捉する。 The filter part 52 is provided with a recess 57 that is recessed radially inward on the outer peripheral surface facing radially outward. The recess 57 is formed adjacent to the downstream side in the rotational direction R of the rotor 102 with respect to the radially outer end 52k of each opening 52h. The recessed portion 57 has a rising wall 57 w that faces the radially outer side on the upstream side in the rotational direction R of the rotor 102. The concave portion 57 captures foreign matter that has passed through the opening 52 h of the filter portion 52.
　フィルター部５３は、フィルター部５２に対し、径方向Ｄｒの外側に間隔をあけて配置されている。フィルター部５３は、径方向Ｄｒの内側と外側とを貫通する開口部５３ｈを有している。図３に示すように、開口部５３ｈは、中心軸方向Ｄａに間隔をあけて複数が並設されている。中心軸方向Ｄａに複数並設された開口部５３ｈは、図４に示すように、ロータ１０２の中心軸回りの周方向に間隔をあけて複数個所に設けられている。各開口部５３ｈは、ロータ１０２の径方向Ｄｒに延びて形成されている。 The filter part 53 is arranged with an interval outside the radial direction Dr with respect to the filter part 52. The filter part 53 has an opening 53h that penetrates the inside and the outside in the radial direction Dr. As shown in FIG. 3, a plurality of openings 53 h are arranged in parallel at intervals in the central axis direction Da. As shown in FIG. 4, a plurality of openings 53 h arranged side by side in the central axis direction Da are provided at a plurality of locations at intervals in the circumferential direction around the central axis of the rotor 102. Each opening 53 h is formed to extend in the radial direction Dr of the rotor 102.
　複数のフィルター部５２，５３は、開口部５２ｈ，５３ｈの径が互いに異なっている。具体的には、フィルター部５３の開口部５３ｈは、径方向Ｄｒの内側に位置するフィルター部５２の開口部５２ｈに対し、その内径が小さく形成されている。 The plurality of filter parts 52 and 53 have different diameters of the openings 52h and 53h. Specifically, the opening 53h of the filter unit 53 has a smaller inner diameter than the opening 52h of the filter unit 52 located inside the radial direction Dr.
　異物回収空間５４は、ケーシング５１Ａ内において、外周壁部５１ｃと、フィルター部５３との間に形成されている。異物回収空間５４は、フィルター部５２の開口部５２ｈと、フィルター部５３の開口部５３ｈとを通過した異物を回収する。
　この異物回収空間５４の径方向Ｄｒの外側に位置するケーシング５１Ａの外周壁部５１ｃには、異物排出孔５８が形成されていても良い。異物排出孔５８は、異物回収空間５４に回収された異物をケーシング５１Ａの外部に排出する。そのため、異物排出孔５８には、バキューム装置（図示無し）等を接続し、異物回収空間５４に回収された異物を吸引して回収するようにすることもできる。 The foreign matter collection space 54 is formed between the outer peripheral wall portion 51c and the filter portion 53 in the casing 51A. The foreign matter collection space 54 collects foreign matter that has passed through the opening 52 h of the filter portion 52 and the opening 53 h of the filter portion 53.
A foreign matter discharge hole 58 may be formed in the outer peripheral wall portion 51 c of the casing 51 </ b> A located outside the foreign matter collection space 54 in the radial direction Dr. The foreign matter discharge hole 58 discharges the foreign matter collected in the foreign matter collection space 54 to the outside of the casing 51A. Therefore, a vacuum device (not shown) or the like can be connected to the foreign matter discharge hole 58, and the foreign matter collected in the foreign matter collection space 54 can be sucked and collected.
　図３、図４に示すように、異物回収部５０Ａは、異物回収空間５４に、異物を捕捉する捕捉部材５５を備えている。捕捉部材５５は、板状に形成され、中心軸方向Ｄａの両端部がケーシング５１Ａの側壁部５１ａと側壁部５１ｂとに固定されている。捕捉部材５５は、ロータ１０２の径方向Ｄｒにおいて、径方向Ｄｒの内側から外側に向かうに従ってロータ１０２の回転方向Ｒの上流側から下流側に向かうように傾斜している。このような捕捉部材５５は、金属製の板材、またはメタルウール等から形成することができる。
　このような捕捉部材５５は、その径方向外側の縁部に、外周壁部５１ｃに向かって延びるツバ部５９を設けて、異物を回収するようにしてもよい。 As shown in FIGS. 3 and 4, the foreign material collection unit 50 </ b> A includes a capturing member 55 that captures foreign materials in the foreign material collection space 54. The capturing member 55 is formed in a plate shape, and both ends in the central axis direction Da are fixed to the side wall 51a and the side wall 51b of the casing 51A. The capturing member 55 is inclined in the radial direction Dr of the rotor 102 from the upstream side to the downstream side in the rotational direction R of the rotor 102 as it goes from the inner side to the outer side in the radial direction Dr. Such a capturing member 55 can be formed from a metal plate, metal wool, or the like.
Such a capturing member 55 may be provided with a flange portion 59 extending toward the outer peripheral wall portion 51c at an edge portion on the radially outer side to collect foreign matter.
　このような異物回収部５０Ａにおいては、ロータ１０２とステータ１０３との間の高圧領域Ｓ２に侵入した異物は、異物回収部５０Ａのフィルター部５２，５３の開口部５２ｈ，５３ｈを経て異物回収空間５４に導入される。このように、異物は、２段階のフィルター部５２，５３の開口部５２ｈ，５３ｈを通過することで、高圧領域Ｓ２に戻り難くなる。開口部５２ｈを通過した異物の一部は、フィルター部５２に形成された凹部５７に入り込むことで、開口部５２ｈを通して高圧領域Ｓ２に戻ることを抑制できる。異物回収空間５４に到達した異物の一部は、捕捉部材５５によって捕捉される。さらに、異物回収空間５４に回収された異物は、ケーシング５１Ａの径方向外側に形成された異物排出孔５８を通して、外部に排出される。 In such a foreign matter recovery unit 50A, foreign matter that has entered the high-pressure region S2 between the rotor 102 and the stator 103 passes through the openings 52h and 53h of the filter parts 52 and 53 of the foreign matter recovery unit 50A, and the foreign matter recovery space 54 To be introduced. In this way, the foreign matter is difficult to return to the high-pressure region S2 by passing through the openings 52h and 53h of the two- stage filter portions 52 and 53. A part of the foreign matter that has passed through the opening 52h can be prevented from returning to the high-pressure region S2 through the opening 52h by entering the recess 57 formed in the filter portion 52. Part of the foreign matter that has reached the foreign matter collection space 54 is captured by the capture member 55. Further, the foreign matter collected in the foreign matter collection space 54 is discharged to the outside through a foreign matter discharge hole 58 formed on the radially outer side of the casing 51A.
　したがって、上述した第一実施形態によれば、シールセグメント２０の上流側に設けられた異物回収部５０Ａで異物を回収することで、異物によって薄板シール２５が影響を受けることを低減できる。 Therefore, according to the first embodiment described above, it is possible to reduce the influence of the thin plate seal 25 by the foreign matter by collecting the foreign matter with the foreign matter collecting unit 50A provided on the upstream side of the seal segment 20.
　さらに、フィルター部５２，５３には、開口部５２ｈ、５３ｈが形成されており、開口部５２ｈ，５３ｈを経て異物回収空間５４に到達した異物は、高圧領域Ｓ２に戻り難くなる。
　さらに、複数のフィルター部５２，５３は、開口部５２ｈ，５３ｈの径が互いに異なるようにした。これによって、開口部５２ｈ，５３ｈを経て異物回収空間５４に到達した異物は、より一層高圧領域Ｓ２に戻り難くなる。 Furthermore, openings 52h and 53h are formed in the filter parts 52 and 53, and the foreign matter that has reached the foreign matter collection space 54 via the openings 52h and 53h is difficult to return to the high-pressure region S2.
Further, the plurality of filter parts 52 and 53 are configured such that the diameters of the opening parts 52h and 53h are different from each other. As a result, the foreign matter that has reached the foreign matter collection space 54 via the openings 52h and 53h is more difficult to return to the high-pressure region S2.
　さらに、異物回収空間５４で回収した異物を捕捉部材５５で捕捉することで、異物が高圧領域Ｓ２に戻ることを低減できる。
　さらに、フィルター部５２の開口部５２ｈを通過した異物が凹部５７に入り込むことで、この異物が開口部５２ｈを通して高圧領域Ｓ２に戻ることを低減できる。 Furthermore, by capturing the foreign matter collected in the foreign matter collection space 54 with the catching member 55, it is possible to reduce the return of the foreign matter to the high pressure region S2.
Furthermore, the foreign matter that has passed through the opening 52h of the filter portion 52 enters the concave portion 57, so that the foreign matter can be prevented from returning to the high-pressure region S2 through the opening 52h.
　さらに、開口部５２ｈは、ロータ１０２側を向く径方向内側が、ロータ１０２の回転方向上流側に向くよう傾斜している。このように構成することで、ロータ１０２の回転にともなってロータ１０２回りに旋回しながら高圧領域Ｓ２から低圧領域Ｓ１に向かって流れる異物を、開口部５２ｈから異物回収空間５４に導き易くなる。 Furthermore, the opening 52 h is inclined so that the radially inner side facing the rotor 102 side faces the upstream side in the rotational direction of the rotor 102. With this configuration, it is easy to guide foreign matter flowing from the high pressure region S2 toward the low pressure region S1 while turning around the rotor 102 as the rotor 102 rotates, from the opening 52h to the foreign matter collection space 54.
　さらに、異物回収空間５４に回収された異物を排出する異物排出孔５８が設けられているので、異物回収部５０Ａで回収した異物が溜まることによる、異物回収部５０Ａの清掃や交換の手間が掛からない。 Further, since the foreign matter discharge hole 58 for discharging the collected foreign matter is provided in the foreign matter collection space 54, it takes time to clean and replace the foreign matter collection unit 50A due to accumulation of foreign matter collected by the foreign matter collection unit 50A. Absent.
（実施形態の第１変形例）
　上述した実施形態においては、異物回収部５０Ａを、シールセグメント２０に対して上流側の高圧領域Ｓ２に設けたが、その具体的な設置位置は、上述した実施形態で例示したものに限定されない。
　図５は、上記軸シール装置の第１変形例の構成を示す断面図である。
　図５に示すように、異物回収部５０Ｂは、上述した異物回収部５０Ａに対し、その内周端部５１ｓを、より径方向Ｄｒ内側に突出させるように設けている。
　この場合、異物回収部５０Ｂは、ケーシング５１Ｂ内に異物を導入する導入孔６０を、中心軸方向Ｄａの上流側を向くように開口させている。 (First Modification of Embodiment)
In the above-described embodiment, the foreign matter collection unit 50A is provided in the high-pressure region S2 on the upstream side with respect to the seal segment 20, but the specific installation position is not limited to that illustrated in the above-described embodiment.
FIG. 5 is a cross-sectional view showing a configuration of a first modification of the shaft seal device.
As shown in FIG. 5, the foreign material recovery unit 50B is provided so that the inner peripheral end 51s protrudes further inward in the radial direction Dr with respect to the foreign material recovery unit 50A described above.
In this case, the foreign material recovery part 50B opens the introduction hole 60 for introducing the foreign material into the casing 51B so as to face the upstream side in the central axis direction Da.
　この異物回収部５０Ｂは、ケーシング５１Ｂと、フィルター部５２，５３と、異物回収空間５４と、捕捉部材５５と、を備えている。
　ケーシング５１Ｂは、シールセグメント２０を保持するハウジング１０４において、中心軸方向Ｄａの高圧側を向く側面１０４ｓに固定され、径方向Ｄｒ内側の内周端部５１ｓが、ロータ１０２の外周面に近接して、ロータ１０２の外周面に対向するよう設けられている。 The foreign matter collection unit 50B includes a casing 51B, filter units 52 and 53, a foreign matter collection space 54, and a capturing member 55.
The casing 51 </ b> B is fixed to a side surface 104 s facing the high pressure side in the central axis direction Da in the housing 104 that holds the seal segment 20, and an inner peripheral end 51 s inside the radial direction Dr is close to the outer peripheral surface of the rotor 102. The rotor 102 is provided to face the outer peripheral surface.
　ケーシング５１Ｂは、一対の側壁部５１ｅ，５１ｆと、外周壁部５１ｇと、内周壁部５１ｈと、を有している。側壁部５１ｅは、ハウジング１０４の側面１０４ｓに沿うよう形成されている。側壁部５１ｆは、側壁部５１ｅに対し、中心軸方向Ｄａに間隔をあけて対向して設けられている。外周壁部５１ｇは、これら一対の側壁部５１ｅ，５１ｆの径方向Ｄｒ外側の端部同士を連結している。内周壁部５１ｈは、一対の側壁部５１ｅ，５１ｆの径方向Ｄｒ内側の端部同士を連結している。
　このようなケーシング５１Ｂには、中心軸方向Ｄａの上流側を向く側壁部５１ｆに、ケーシング５１Ｂの内外を連通する導入孔６０が形成されている。 The casing 51B has a pair of side wall portions 51e and 51f, an outer peripheral wall portion 51g, and an inner peripheral wall portion 51h. The side wall 51 e is formed along the side surface 104 s of the housing 104. The side wall part 51f is provided to face the side wall part 51e with an interval in the central axis direction Da. The outer peripheral wall 51g connects the ends on the outer side in the radial direction Dr of the pair of side walls 51e and 51f. The inner peripheral wall portion 51h connects ends of the pair of side wall portions 51e and 51f on the inner side in the radial direction Dr.
In such a casing 51B, an introduction hole 60 that communicates the inside and outside of the casing 51B is formed in a side wall 51f that faces the upstream side in the central axis direction Da.
　フィルター部５２，５３は、ケーシング５１Ｂの内側で、導入孔６０よりも径方向Ｄｒの外側に配置されている。 The filter parts 52 and 53 are disposed inside the casing 51B and outside the introduction hole 60 in the radial direction Dr.
　この異物回収部５０Ｂにおいては、ロータ１０２とステータ１０３との間の高圧領域Ｓ２に侵入した異物は、導入孔６０からケーシング５１Ｂ内に導入される。この異物は、ケーシング５１Ｂ内で、フィルター部５２，５３の開口部５２ｈ，５３ｈを経て径方向Ｄｒ外側の異物回収空間５４に導入される。 In the foreign matter collecting section 50B, foreign matter that has entered the high pressure region S2 between the rotor 102 and the stator 103 is introduced into the casing 51B through the introduction hole 60. This foreign matter is introduced into the foreign matter collection space 54 outside the radial direction Dr through the openings 52h and 53h of the filter portions 52 and 53 in the casing 51B.
　このような異物回収部５０Ｂによれば、導入孔６０が、中心軸方向Ｄａの上流側、つまり異物が流れてくる方向に開口しているので、異物をケーシング５１Ｂ内に効率良く導いて回収することが可能となる。
　さらに、シールセグメント２０の上流側に設けられた異物回収部５０Ｂで異物を捕捉することで、異物によって薄板シール２５が悪影響を受けることを抑制できる。 According to such a foreign matter collecting part 50B, since the introduction hole 60 is opened upstream of the central axis direction Da, that is, in the direction in which the foreign matter flows, the foreign matter is efficiently guided and collected in the casing 51B. It becomes possible.
Furthermore, by capturing the foreign matter with the foreign matter collecting unit 50B provided on the upstream side of the seal segment 20, it is possible to suppress the thin plate seal 25 from being adversely affected by the foreign matter.
（実施形態の第２変形例）
　図６は、上記軸シール装置の第２変形例の構成を示す断面図である。
　図６に示すように、異物回収部５０Ｃは、シールセグメント２０の上流側において、径方向Ｄｒ内側から外側に向かって延びる流路１１０の外周端部１１０ｓに設けるようにしても良い。 (Second Modification of Embodiment)
FIG. 6 is a cross-sectional view showing a configuration of a second modification of the shaft seal device.
As shown in FIG. 6, the foreign material recovery part 50 </ b> C may be provided on the outer peripheral end part 110 s of the flow path 110 extending from the inside in the radial direction Dr to the outside on the upstream side of the seal segment 20.
　異物回収部５０Ｃは、上記実施形態と同様、ケーシング５１Ｃと、フィルター部５２，５３と、異物回収空間５４と、捕捉部材５５と、を備えている。 The foreign material recovery unit 50C includes a casing 51C, filter units 52 and 53, a foreign material recovery space 54, and a capturing member 55, as in the above embodiment.
　ケーシング５１Ｃは、上記実施形態のケーシング５１Ａと同様、一対の側壁部５１ａ，５１ｂと、外周壁部５１ｃと、を備え、径方向Ｄｒ内側のロータ１０２側に向かって開口する導入孔５１ｄを有している。
　このケーシング５１Ｃは、径方向Ｄｒ内側から外側に向かって延びる流路１１０の外周端部１１０ｓにおいて、ステータ１０３に固定されている。これにより、異物回収部５０Ｃは、導入孔５１ｄが、流路１１０の径方向Ｄｒ内側に向いて開口している。 The casing 51C includes a pair of side wall portions 51a and 51b and an outer peripheral wall portion 51c, and has an introduction hole 51d that opens toward the rotor 102 inside the radial direction Dr, like the casing 51A of the above embodiment. ing.
The casing 51C is fixed to the stator 103 at the outer peripheral end 110s of the flow path 110 extending from the inner side to the outer side in the radial direction Dr. As a result, in the foreign matter collecting part 50C, the introduction hole 51d is opened toward the inside of the flow path 110 in the radial direction Dr.
　上述した異物回収部５０Ｃにおいて、ロータ１０２とステータ１０３との間の高圧領域Ｓ２に侵入した異物は、流路１１０に沿って径方向Ｄｒの内側から外側に向かって流れる。この流路１１０に沿って移動した異物は、導入孔５１ｄに形成されたフィルター部５２の開口部５２ｈからケーシング５１Ｃ内に導入される。ケーシング５１Ｃ内に導入された異物は、フィルター部５２，５３の開口部５２ｈ，５３ｈを経て異物回収空間５４に回収される。 In the foreign matter recovery section 50C described above, foreign matter that has entered the high pressure region S2 between the rotor 102 and the stator 103 flows along the flow path 110 from the inside to the outside in the radial direction Dr. The foreign matter that has moved along the flow path 110 is introduced into the casing 51C from the opening 52h of the filter portion 52 formed in the introduction hole 51d. The foreign matter introduced into the casing 51C is collected in the foreign matter collection space 54 through the openings 52h and 53h of the filter portions 52 and 53.
　したがって、上述した実施形態の第二変形例によれば、上記実施形態と同様、シールセグメント２０の上流側に設けられた異物回収部５０Ｃで異物を回収することができる。そのため、薄板シール２５が、異物によって影響を受けることを低減できる。
　さらに、導入孔５１ｄが、径方向Ｄｒの内側から外側に向かって延びる流路１１０に対向する方向、つまり異物が流れてくる方向に開口しているので、異物をケーシング５１Ｃ内に効率良く導いて回収することが可能となる。 Therefore, according to the second modified example of the above-described embodiment, the foreign material can be collected by the foreign material collecting unit 50C provided on the upstream side of the seal segment 20 as in the above embodiment. Therefore, the thin plate seal 25 can be reduced from being affected by foreign matter.
Furthermore, since the introduction hole 51d opens in a direction opposite to the flow path 110 extending from the inside to the outside in the radial direction Dr, that is, in the direction in which the foreign material flows, the foreign material is efficiently guided into the casing 51C. It becomes possible to collect.
（その他の変形例）
　この発明は、上述した実施形態に限定されるものではなく、この発明の趣旨を逸脱しない範囲において、上述した実施形態に種々の変更を加えたものを含む。すなわち、実施形態で挙げた具体的な形状や構成等は一例にすぎず、適宜変更が可能である。
　例えば、異物回収部５０Ａ～５０Ｃは、２つのフィルター部５２，５３を備えるようにしたが、１つのみ、あるいは３つ以上のフィルター部を備えるようにしてもよい。
　異物回収部５０Ｃは、開口部５２ｈ，５３ｈの構成が互いに異なる２種類のフィルター部５２，５３を備えるようにしたが、１種類のみ、あるいは３種類以上のフィルター部を備えるようにしてもよい。 (Other variations)
The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
For example, the foreign matter collecting units 50A to 50C include the two filter units 52 and 53, but may include only one or three or more filter units.
The foreign matter collecting unit 50C includes two types of filter units 52 and 53 having different configurations of the openings 52h and 53h, but may include only one type or three or more types of filter units.
　さらに、異物回収空間５４に、捕捉部材５５を備えるようにしたが、異物回収空間５４内で異物を回収することができるのであれば、その構成は他のいかなるものであってもよい。さらには、捕捉部材５５を備えない構成とすることも可能である。 Furthermore, although the foreign material collection space 54 is provided with the capturing member 55, any other configuration may be used as long as the foreign material can be collected in the foreign material collection space 54. Furthermore, a configuration without the capturing member 55 is also possible.
　さらに、異物回収部５０Ａ～５０Ｃは、ステータ１０３又はハウジング１０４に対して着脱可能とし、異物回収部５０Ａ～５０Ｃを取り外し他状態で異物回収空間５４に溜まった異物を除去したり、新たな異物回収部５０Ａ～５０Ｃと交換したりするようにしてもよい。 Further, the foreign matter collecting parts 50A to 50C can be attached to and detached from the stator 103 or the housing 104, and the foreign matter collecting parts 50A to 50C are removed to remove foreign matter accumulated in the foreign matter collecting space 54 in another state or to collect new foreign matter collected. It may be exchanged with the parts 50A to 50C.
　さらに、軸シール装置１において、例えばシールセグメント２０の構成等については、高圧領域Ｓ２と低圧領域Ｓ１との間でシール機能を発揮できるのであれば、適宜他のシール構造を採用してもよい。 Furthermore, in the shaft seal device 1, for example, regarding the configuration of the seal segment 20, other seal structures may be appropriately employed as long as the seal function can be exhibited between the high pressure region S2 and the low pressure region S1.
　さらに、例えば、軸シール装置１は、薄板シール２５とシールフィン２６とを備えるようにしたが、高圧領域Ｓ２と低圧領域Ｓ１との間でシール機能を発揮できるのであれば、適宜、他のシール構造を採用してもよい。
　さらに、上記実施形態及び変形例の軸シール装置１は、蒸気タービンや、ガスタービン以外の回転機械にも適用可能である。 Further, for example, the shaft seal device 1 is provided with the thin plate seal 25 and the seal fin 26. However, if the seal function can be exhibited between the high pressure region S2 and the low pressure region S1, other seals are appropriately used. A structure may be adopted.
Furthermore, the shaft seal device 1 according to the embodiment and the modification can be applied to a rotary machine other than a steam turbine or a gas turbine.
　この発明は、ロータとロータを囲うステータとの間に設けられて、ロータとステータとの間の空間をロータの中心軸方向において高圧領域と低圧領域とに仕切る軸シール装置及び、この軸シール装置を備える回転機械に適用できる。この発明によれば、シール体への異物の影響を低減させることができる。 The present invention provides a shaft seal device provided between a rotor and a stator surrounding the rotor, and partitions a space between the rotor and the stator into a high pressure region and a low pressure region in the central axis direction of the rotor, and the shaft seal device It is applicable to a rotating machine equipped with According to this invention, it is possible to reduce the influence of foreign matter on the seal body.
１　軸シール装置
５　シールリング
２０　シールセグメント
２１　シール部材本体
２２　受圧部
２２ｆ　受圧面
２３　ベース部
２４　連結部
２５　薄板シール
２６　シールフィン
２７　薄板シール片
２７ａ　基端部
２７ｂ　先端部
２８　保持部材
３０　凹溝
３１　外周溝部
３２　内周溝部
３３　板バネ
３５　切欠き
５０Ａ，５０Ｂ，５０Ｃ　異物回収部
５１Ａ，５１Ｂ，５１Ｃ　ケーシング
５１ａ，５１ｂ，５１ｅ，５１ｆ　側壁部
５１ｃ，５１ｇ　外周壁部
５１ｄ，６０　導入孔
５１ｈ　内周壁部
５１ｓ　内周端部
５２　フィルター部
５２ｈ　開口部
５２ｊ　端部
５２ｋ　端部
５３　フィルター部
５３ｈ　開口部
５４　異物回収空間
５５　捕捉部材
５７　凹部
５７ｗ　立ち上がり壁
５８　異物排出孔
５９　ツバ部
１００　回転機械
１０２　ロータ
１０３　ステータ
１０４　ハウジング
１０４ｆ　内周面
１０４ｓ　側面
１０５　溝
１０６　収容凹部
１０６ａ　内壁面
１０６ｇ　内周面
１０６ｓ　空間
１０７　連通部
１０８　突出部
１１０　流路
１１０ｓ　外周端部
Ｄａ　中心軸方向
Ｄｃ　周方向
Ｄｒ　径方向
Ｐｈ　背面圧力
Ｒ　回転方向
Ｓ１　低圧領域
Ｓ２　高圧領域 1 shaft seal device 5 seal ring 20 seal segment 21 seal member body 22 pressure receiving portion 22f pressure receiving surface 23 base portion 24 connecting portion 25 thin plate seal 26 seal fin 27 thin plate seal piece 27a base end portion 27b distal end portion 28 holding member 30 concave groove 31 Outer peripheral groove part 32 Inner peripheral groove part 33 Leaf spring 35 Notches 50A, 50B, 50C Foreign matter collecting parts 51A, 51B, 51C Casing 51a, 51b, 51e, 51f Side wall part 51c, 51g Outer peripheral wall part 51d, 60 Introduction hole 51h Inner peripheral wall part 51 s Inner peripheral edge 52 Filter part 52 h Opening part 52 j End part 52 k End part 53 Filter part 53 h Opening part 54 Foreign matter collection space 55 Trapping member 57 Recessed wall 58 Foreign matter discharge hole 59 Head part 100 Rotating machine 102 Rotor 103 Stator 104 Housing 104f Inner peripheral surface 1 04s Side surface 105 Groove 106 Housing recess 106a Inner wall surface 106g Inner peripheral surface 106s Space 107 Communication portion 108 Protruding portion 110 Channel 110s Outer end portion Da Central axial direction Dc Peripheral direction Dr Radial direction Ph Back pressure R Rotating direction S1 region

Claims (9)

  1. 　ロータと前記ロータを囲うステータとの間に設けられて、前記ロータと前記ステータとの間の空間を前記ロータの中心軸方向において高圧領域と低圧領域とに仕切る軸シール装置であって、
    　前記ステータに固定され、前記ロータに向かって突出するシール部と、
    　前記シール部の上流側の高圧領域に設けられて、内部に異物回収空間が形成された異物回収部と、を備え、
    　前記異物回収部には、前記高圧領域の異物を前記異物回収空間に導入する導入孔が形成されている軸シール装置。     A shaft seal device provided between a rotor and a stator surrounding the rotor, and partitioning a space between the rotor and the stator into a high pressure region and a low pressure region in a central axis direction of the rotor,
    A seal portion fixed to the stator and projecting toward the rotor;
    A foreign matter collecting part provided in a high pressure region upstream of the seal part and having a foreign matter collecting space formed therein;
    The shaft seal device in which the foreign matter collecting part is formed with an introduction hole for introducing the foreign matter in the high pressure region into the foreign matter collecting space.
  2. 　前記異物回収部は、
    　前記異物が通過する開口部を複数有したフィルター部をさらに備える請求項１に記載の軸シール装置。     The foreign matter recovery unit
    The shaft seal device according to claim 1, further comprising a filter portion having a plurality of openings through which the foreign matter passes.
  3. 　前記異物回収部は、前記フィルター部を複数備え、
    　複数の前記フィルター部は、前記開口部の径が互いに異なる請求項２に記載の軸シール装置。     The foreign matter collection unit includes a plurality of the filter units,
    The shaft sealing device according to claim 2, wherein the plurality of filter portions have different diameters of the openings.
  4. 　前記導入孔は、径方向内側を向いて開口し、
    　前記フィルター部は、前記導入孔の前記径方向内側を塞ぐように配置され、
    　前記フィルター部の前記開口部は、少なくとも前記径方向内側で前記ロータの回転方向上流側を向いて開口するように傾斜している請求項２又は３に記載の軸シール装置。     The introduction hole opens toward the inside in the radial direction,
    The filter portion is disposed so as to block the radially inner side of the introduction hole,
    4. The shaft seal device according to claim 2, wherein the opening of the filter portion is inclined so as to open at least radially inward and toward the upstream side in the rotational direction of the rotor.
  5. 　前記フィルター部は、径方向外側を向く外周面に、径方向内側に向かって窪む凹部を有している請求項２から４の何れか一項に記載の軸シール装置。 The shaft seal device according to any one of claims 2 to 4, wherein the filter portion has a concave portion that is recessed toward the radially inner side on an outer peripheral surface facing the radially outer side.
  6. 　前記導入孔は、軸方向高圧側または径方向内側を向いて開口している請求項１から５の何れか一項に記載の軸シール装置。 The shaft sealing device according to any one of claims 1 to 5, wherein the introduction hole opens toward an axially high-pressure side or a radially inner side.
  7. 　前記異物回収空間に、前記異物を捕捉する捕捉部材が設けられている請求項１から６のいずれか一項に記載の軸シール装置。 The shaft seal device according to any one of claims 1 to 6, wherein a capture member that captures the foreign matter is provided in the foreign matter collection space.
  8. 　前記異物回収空間に回収された前記異物を排出する異物排出孔をさらに有している請求項１から７の何れか一項に記載の軸シール装置。 The shaft seal device according to any one of claims 1 to 7, further comprising a foreign matter discharge hole for discharging the foreign matter collected in the foreign matter collection space.
  9. 　請求項１から８の何れか一項に記載の軸シール装置を備えた回転機械。 A rotary machine comprising the shaft seal device according to any one of claims 1 to 8.
PCT/JP2017/030942 2017-03-23 2017-08-29 Shaft seal device, and rotating machine WO2018173315A1 (en)

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JP2021092234A (en) * 2019-12-06 2021-06-17 株式会社東芝 Seal device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6273426B1 (en) * 1999-07-22 2001-08-14 Avaya Technology Corp. Hydrodynamic seal and a method for providing the same
JP2014066134A (en) * 2012-08-23 2014-04-17 Mitsubishi Heavy Ind Ltd Rotary machine
JP5851890B2 (en) * 2012-03-08 2016-02-03 三菱重工業株式会社 Shaft seal device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6273426B1 (en) * 1999-07-22 2001-08-14 Avaya Technology Corp. Hydrodynamic seal and a method for providing the same
JP5851890B2 (en) * 2012-03-08 2016-02-03 三菱重工業株式会社 Shaft seal device
JP2014066134A (en) * 2012-08-23 2014-04-17 Mitsubishi Heavy Ind Ltd Rotary machine

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