WO2018173316A1 - 軸シール装置、回転機械 - Google Patents

軸シール装置、回転機械 Download PDF

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Publication number
WO2018173316A1
WO2018173316A1 PCT/JP2017/031215 JP2017031215W WO2018173316A1 WO 2018173316 A1 WO2018173316 A1 WO 2018173316A1 JP 2017031215 W JP2017031215 W JP 2017031215W WO 2018173316 A1 WO2018173316 A1 WO 2018173316A1
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WIPO (PCT)
Prior art keywords
seal
rotor
pressure region
peripheral surface
communication groove
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PCT/JP2017/031215
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English (en)
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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Application filed by 三菱日立パワーシステムズ株式会社 filed Critical 三菱日立パワーシステムズ株式会社
Publication of WO2018173316A1 publication Critical patent/WO2018173316A1/ja

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  • the present invention relates to a shaft seal device and a rotary machine.
  • This application claims priority on March 23, 2017 based on Japanese Patent Application No. 2017-057979 filed in Japan, 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 in which a sealing member is provided with a through-hole penetrating in the axial direction of the rotor.
  • the through hole allows the low pressure region and the high pressure region to communicate with each other, and foreign matter can be discharged to the low pressure region through the through hole.
  • the sealing member described in Patent Document 1 needs to form a through-hole so as to bypass the seal body, which takes time and effort for processing.
  • the fluid moves from the high pressure region to the low pressure region through the through hole, so that the differential pressure before and after the seal member is reduced.
  • a distribution occurs in the differential pressure between the high pressure region and the low pressure region around the portion where the through hole is provided and the other portion.
  • An object of the present invention is to provide a shaft seal device and a rotary machine that can suppress the influence on the seal characteristics and reduce the influence of 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 ring and a seal body.
  • the seal ring is composed of a plurality of seal ring pieces provided in the circumferential direction so that end faces in the circumferential direction are adjacent to each other.
  • the seal body is fixed to each of the seal ring pieces and faces the rotor.
  • At least one of the seal ring pieces includes a communication groove.
  • the communication groove is formed to be recessed from the end surface, and communicates the high pressure region and the low pressure region so as to bypass the seal body.
  • Such a communication groove is formed on the end surface of the seal ring piece, and is formed on a mating surface with another seal ring piece adjacent in the circumferential direction. In the portion where the end faces of the seal ring pieces are adjacent to each other, the working fluid leaks between the high pressure area and the low pressure area through the gap between the end faces of the adjacent seal ring pieces, so the differential pressure between the high pressure area and the low pressure area Is small.
  • the processing for forming the communication groove can be easily performed as compared with the case where the through hole is formed in the seal ring piece.
  • the shaft seal device may include a guide member.
  • the guide member is provided in at least one of the high-pressure region and the low-pressure region with respect to the seal ring piece, and guides the working fluid radially outward from the gap between the seal body and the outer peripheral surface of the rotor.
  • the working fluid is guided radially outward from the gap between the seal body and the outer peripheral surface of the rotor by the guide member.
  • the foreign matter is guided radially outward from the gap between the seal body and the outer peripheral surface of the rotor together with the working fluid, and the foreign matter can be prevented from entering the gap between the seal body and the outer peripheral surface of the rotor. Therefore, it can suppress that a foreign material reaches a seal body.
  • the guide member according to the second aspect is a blade provided on the outer peripheral surface of the rotor and guiding the working fluid radially outward by rotating integrally with the rotor. Also good. With this configuration, when the blades provided on the outer peripheral surface of the rotor rotate integrally with the rotor, foreign matters are generated by the flow of the working fluid that is generated by the blades toward the outside in the radial direction. It is guided radially outward from the gap with the surface.
  • the guide member according to the second aspect may be a wall body provided on the outer peripheral surface of the rotor and extending radially outward. By comprising in this way, it is suppressed by a wall body that a foreign material enters into the clearance gap between a sealing body and the outer peripheral surface of a rotor. The foreign matter is guided radially outward together with the flow of the working fluid that has collided with the wall.
  • the guide member according to the second aspect may be an umbrella-shaped member provided on the seal ring piece and extending radially inward.
  • a plurality of sealing bodies may be provided at intervals in the central axis direction.
  • the communication groove may include a branch groove communicating between the seal bodies adjacent to each other in the central axis direction.
  • a guide surface may be formed on at least one of the outer peripheral surface of the seal body and the rotor.
  • the guide surface guides the working fluid flowing in the direction of the central axis through the gap between the seal body and the outer peripheral surface of the rotor to the branch groove side.
  • the shaft seal device may include a circumferential guide member that guides the working fluid to the communication groove.
  • the circumferential guide member is provided on the downstream side of the circumferential flow of the working fluid generated on the radially outer side of the rotor as the rotor rotates around the central axis with respect to the communication groove.
  • the shaft seal device is provided between the rotor and the stator surrounding the rotor, and partitions the high pressure region and the low pressure region in the central axis direction of the rotor.
  • the shaft seal device includes a seal ring including a plurality of seal ring pieces provided in the circumferential direction so that end faces in the circumferential direction are adjacent to each other, a seal body fixed to each of the seal ring pieces and facing the rotor, Is provided.
  • the shaft seal device includes a guide member that is provided at least on the high-pressure region side with respect to the seal ring piece and guides the working fluid radially outward from a gap between the seal body and the outer peripheral surface of the rotor.
  • the working fluid is guided radially outward from the gap between the seal body and the outer peripheral surface of the rotor by the guide member.
  • foreign matter that has entered the space between the rotor and the stator is guided radially outward together with the working fluid from the gap between the seal body and the outer circumferential surface of the rotor, and the gap between the seal body and the outer circumferential surface of the rotor. It is possible to prevent foreign matter from entering the door. Therefore, it can suppress that a foreign material reaches a seal body. Thereby, it can suppress that a sealing body is influenced by a foreign material.
  • a rotary machine includes the shaft seal device according to any one of the first to ninth aspects.
  • the shaft seal device according to any one of the first to ninth aspects.
  • the influence on the sealing characteristics can be suppressed, and the influence of the foreign matter on the sealing body can be reduced.
  • 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 view showing a communication groove formed on an end face of a seal segment constituting the shaft seal device.
  • FIG. 4 is a perspective view of the seal member main body in which a communication groove is formed. 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 ⁇ / b> A is provided in an annular space between the rotor 102 and the stator 103. As shown in FIG. 2, the shaft seal device 1 ⁇ / b> A has an annular space formed in 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 1A includes a plurality of (eight in the present embodiment) seal segments (seal ring pieces) 20A extending in an arc shape.
  • the plurality of seal segments (seal ring pieces) 20A are annularly arranged in the circumferential direction Dc.
  • the shaft seal device 1A constitutes an annular seal ring 5 as a whole by arranging these eight seal segments 20A in the circumferential direction Dc. That is, the seal ring 5 of the shaft seal device 1 ⁇ / b> A has a structure that is divided into a plurality of portions in the circumferential direction Dc of the rotor 102.
  • the seal segment 20 ⁇ / b> A 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 (high-pressure fluid introduction part) 106 and a communication part 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 ⁇ / b> A 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 thin plate seal piece 27 is held by a holding member 28 at a base end portion 27 a outside in the radial direction Dr.
  • the holding member 28 includes holding rings 28a and 28b and a connection member 28c.
  • the retaining rings 28a and 28b are formed in a U-shaped cross section.
  • convex portions 27c and 27d extending on both sides in the central axis direction Da are formed at the base end portion 27a of the thin plate seal piece 27 connecting the holding rings 28a and 28b.
  • the thin plate seal piece 27 is held by the holding member 28 by the convex portions 27 c and 27 d being fitted into the holding rings 28 a and 28 b of the holding member 28.
  • These thin plate sealing pieces 27 are held by the holding member 28 so that the angle formed with the outer peripheral surface of the rotor 102 with respect to the rotation direction of the rotor 102 becomes an acute angle. Between the base end portion 27 a of the thin plate sealing piece 27 and the holding member 28, a spacer 29 for suppressing rattling of each thin plate sealing piece 27 is provided.
  • the thin plate seal 25 and the holding member 28 are accommodated in a concave groove 30 formed in the seal member main body 21.
  • 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.
  • 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 20A 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 20A.
  • 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 shaft seal device 1A as described above includes a communication groove 50 in the seal segment 20A.
  • the communication groove 50 is formed on the end surface 21s located at the end of the seal member body 21 of the seal segment 20A in the circumferential direction Dc.
  • the communication groove 50 is formed in a groove shape extending along the end surface 21s and recessed inward in the circumferential direction Dc from the end surface 21s.
  • One end portion 50a of the communication groove 50 opens toward the low pressure region S1, and the other end portion 50b opens toward the high pressure region S2.
  • the communication groove 50 has one end 50a and the other end 50b extending in the central axis direction Da.
  • the communication groove 50 includes radial flow paths 50c and 50d and an axial flow path 50e between the one end 50a and the other end 50b.
  • the radial flow paths 50c and 50d extend from the one end 50a and the other end 50b toward the outside in the radial direction Dr.
  • the axial flow path 50 e is located outside the radial direction Dr of the thin plate seal 25.
  • the axial flow path 50e extends in the central axial direction Da and connects the outer ends of the radial flow paths 50c and 50d in the radial direction Dr. That is, the communication groove 50 is formed so as to bypass the thin plate seal 25.
  • the communication groove 50 communicates the high pressure region S2 and the low pressure region S1.
  • the communication groove 50 exemplified in this embodiment includes a plurality of branch grooves 51 communicating between the seal fins 26 adjacent to each other in the central axis direction Da. These branch grooves 51 are open toward the inside in the radial direction Dr on the inner peripheral surface 21 f of the seal member main body 21. These branch grooves 51 extend from the inner peripheral surface 21f toward the outer side in the radial direction Dr, and are connected to one end 50a and the other end 50b of the communication groove 50, respectively.
  • the communication groove 50 is formed on the end surface 21s of the seal member main body 21 of the seal segment 20A.
  • the working fluid leaks from the high pressure region S2 toward the low pressure region S1 through the gap between the adjacent end surfaces 21s.
  • the foreign matter that has entered the space between the stator 103 and the rotor 102 passes through the communication groove 50 together with the leakage flow of the working fluid flowing through the gap between the end faces 21s. In this way, the foreign matter that has entered the space between the rotor 102 and the stator 103 bypasses the thin plate seal 25 via the communication groove 50 and is discharged to the low pressure region S1.
  • the foreign matter when foreign matter enters the gap between the inner peripheral surface 21 f of the seal member main body 21 and the outer peripheral surface 102 f of the rotor 102, the foreign matter enters the communication groove 50 from the branch groove 51 provided between the plurality of seal fins 26. Then, through the communication groove 50, the thin plate seal 25 is bypassed and discharged to the low pressure region S1.
  • the shaft seal device 1 ⁇ / b> A and the rotary machine 100 of the first embodiment described above the foreign matter that has entered the space between the rotor 102 and the stator 103 bypasses the thin plate seal 25 via the communication groove 50. Discharged. Thereby, it can suppress that the thin plate seal
  • the processing for forming the communication groove 50 is performed by an end mill, electric discharge machining, or the like as compared with the case where the through hole is formed in the seal member main body 21. Can be easily performed.
  • a branch groove 51 communicating with the communication groove 50 is provided between the seal fins 26 adjacent to each other in the central axis direction Da.
  • the shaft seal device 1B is provided in an annular space between the rotor 102 and the stator 103, like the shaft seal device 1A shown in the first embodiment.
  • the shaft seal device 1B includes a plurality of seal segments (seal ring pieces) 20B.
  • FIG. 5 is a cross-sectional view showing a configuration in the second embodiment of the shaft seal device.
  • the shaft seal device 1 ⁇ / b> B has an annular space formed in 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.
  • the seal segment 20 ⁇ / b> B includes a seal member main body 21, a thin plate seal 25, and seal fins 26.
  • the seal segment 20 ⁇ / b> B includes a communication groove 50 on the end surface 21 s of the seal member main body 21.
  • the communication groove 50 is formed in a groove shape extending along the end surface 21s and recessed inward in the circumferential direction Dc from the end surface 21s.
  • One end portion 50a of the communication groove 50 opens toward the low pressure region S1, and the other end portion 50b opens toward the high pressure region S2.
  • the communication groove 50 has radial flow paths 50c and 50d and an axial flow path 50e between the one end 50a and the other end 50b, and is formed so as to bypass the thin plate seal 25.
  • the communication groove 50 communicates the high pressure region S2 and the low pressure region S1.
  • the communication groove 50 includes a branch groove 51 communicating between the seal fins 26 adjacent to each other in the central axis direction Da.
  • the seal segment 20B includes a guide member 60 that guides the working fluid to the outside in the radial direction Dr rather than the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102.
  • the guide member 60 includes a plurality of wings 61.
  • a plurality of blades 61 are provided on the outer peripheral surface 102f of the rotor 102 at intervals in the circumferential direction Dc. The plurality of blades 61 rotate integrally with the rotor 102 to guide the working fluid to the outside in the radial direction Dr.
  • the working fluid is guided by the guide member 60 to the outside in the radial direction Dr rather than the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102. Accordingly, the foreign matter is guided to the outside in the radial direction Dr together with the working fluid, and is difficult to enter the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102.
  • the guide member 60 guides the flow Fb of the working fluid to the outside in the radial direction Dr with respect to the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102. Is done. Thereby, it can suppress that a foreign material penetrate
  • FIG. By guiding the flow Fb of the working fluid to the outside in the radial direction Dr, the foreign matter easily flows into the communication groove 50 together with the working fluid. As a result, foreign substances can be prevented from reaching the thin plate seal 25.
  • the communication groove 50 is provided in a portion where the working fluid leaks between the high pressure region S2 and the low pressure region S1 through the gap between the end surfaces 21s of the seal segment 20B. Accordingly, even if the working fluid leaks through the communication groove 50, the influence of the communication groove 50 can be reduced. Furthermore, by forming the communication groove 50 on the end surface 21 s of the seal member main body 21, the processing for forming the communication groove 50 can be easily performed as compared with the case where the through hole is formed in the seal member main body 21. .
  • FIG. 6 is a cross-sectional view illustrating a configuration in a first modification of the second embodiment of the shaft seal device.
  • the seal segment (seal ring piece) 20C of the shaft seal device 1C is located on the outer side in the radial direction Dr with respect to the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102.
  • a guide member 60 for guiding the working fluid is provided.
  • the guide member 60 is a wall body 62 provided on the outer peripheral surface 102f of the rotor 102 and extending outward in the radial direction Dr.
  • the wall 62 extends continuously along the circumferential direction Dc.
  • the wall body 62 may be formed at a height extending outward in the radial direction Dr from the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102.
  • FIG. 7 is a cross-sectional view showing a configuration in a second modification of the second embodiment of the shaft seal device.
  • the seal segment (seal ring piece) 20D of the shaft seal device 1D is located on the outer side in the radial direction Dr with respect to the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102.
  • a guide member 60 for guiding the working fluid is provided.
  • the guide member 60 is an umbrella-like member 63 provided on the seal member main body 21 and extending inward in the radial direction Dr.
  • the umbrella-shaped member 63 is formed in an annular shape extending continuously in the circumferential direction Dc around the central axis of the rotor 102.
  • the umbrella-shaped member 63 is provided inside the radial direction Dr with the central axis of the rotor 102 as the center with respect to the other end portion 50 b of the communication groove 50.
  • the umbrella-shaped member 63 is formed in an umbrella shape in which the outer diameter around the central axis of the rotor 102 gradually decreases as the distance from the side surface of the base portion 23 of the seal member main body 21 toward the central axis direction Da increases. ing.
  • the umbrella member 63 does not contact the outer peripheral surface 102 f of the rotor 102.
  • the flow Fd of the working fluid hitting the umbrella-shaped member 63 by the guide member 60 including the umbrella-shaped member 63 causes the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102 to flow. It is guided to the outside in the radial direction Dr rather than the gap. That is, the working fluid flow Fd is guided toward the other end 50 b of the communication groove 50. This makes it difficult for foreign matter to enter the gap between the inner peripheral surface 21 f of the seal member main body 21 and the outer peripheral surface 102 f of the rotor 102.
  • the foreign matter By guiding the flow Fd of the working fluid to the outside of the radial direction Dr, the foreign matter easily flows into the communication groove 50 together with the working fluid. Therefore, it is possible to suppress foreign matters from reaching the thin plate seal 25.
  • the shaft seal device 1E is provided in an annular space between the rotor 102 and the stator 103, like the shaft seal device 1A of the first embodiment.
  • the shaft seal device 1E includes a plurality of seal segments (seal ring pieces) 20E.
  • FIG. 8 is a cross-sectional view showing the configuration of the third embodiment of the shaft seal device.
  • the shaft seal device 1 ⁇ / b> E has an annular space formed in 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.
  • the high pressure region S2 is a cross-sectional view showing the configuration of the third embodiment of the shaft seal device.
  • the shaft seal device 1 ⁇ / b> E has an annular space formed in 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.
  • the high pressure region S2 is a cross-sectional view showing the configuration of the third embodiment of the shaft seal device.
  • the seal segment 20E includes a seal member main body 21, a thin plate seal 25, and seal fins 26.
  • the seal segment 20E includes a communication groove 50 on the end surface 21s of the seal member main body 21.
  • the communication groove 50 is formed in a groove shape extending along the end surface 21s and recessed inward in the circumferential direction Dc from the end surface 21s.
  • One end portion 50a of the communication groove 50 opens toward the low pressure region S1, and the other end portion 50b opens toward the high pressure region S2.
  • the communication groove 50 has radial flow paths 50c and 50d and an axial flow path 50e between one end 50a and the other end 50b, and is formed so as to bypass the thin plate seal 25. .
  • the communication groove 50 allows the high pressure region S2 and the low pressure region S1 to communicate with each other.
  • the communication groove 50 includes a branch groove 51 communicating between the seal fins 26 adjacent to each other in the central axis direction Da.
  • the seal segment 20E includes a guide surface 64.
  • the guide surface 64 is formed facing the upstream side of the flow F of the working fluid in the seal fin 26.
  • the rotor 102 includes a guide surface 65.
  • the guide surface 65 is formed in an annular recess 66 formed in the outer peripheral surface 102 f of the rotor 102 and recessed inward in the radial direction Dr.
  • the guide surface 65 is formed in the recess 66 so as to face the upstream side of the flow F of the working fluid.
  • the seal fin 26 disposed in the portion where the recess 66 is formed is formed with such a length that the tip end portion 26a is disposed in the recess 66.
  • the flow Fe of the working fluid flowing into the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102 passes through the gap between the seal fin 26 and the outer peripheral surface 102f of the rotor 102, and then the guide surface 64. Or, when it hits the guide surface 65, it winds up in a spiral and is guided outward in the radial direction Dr. As a result, the working fluid efficiently flows into the branch groove 51.
  • the foreign matter that has entered the gap between the inner peripheral surface 21 f of the seal member main body 21 and the outer peripheral surface 102 f of the rotor 102 is guided to the branch groove 51 by the guide surfaces 64 and 65. As a result, the foreign matter can be more reliably fed into the communication groove 50 through the branch groove 51.
  • the shaft seal device 1E and the rotary machine 100 of the third embodiment described above the foreign matter that has flowed into the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102 is guided by the guide surface 64, 65 is guided in a direction toward the outer branching groove 51 in the radial direction Dr.
  • the foreign matter can be more reliably fed into the communication groove 50 through the branch groove 51.
  • the communication groove 50 is provided in a portion where the working fluid leaks between the high pressure region S2 and the low pressure region S1 through the gap between the end surfaces 21s of the seal segment 20E. Accordingly, even if the working fluid leaks through the communication groove 50, the influence of the communication groove 50 can be reduced. Furthermore, by forming the communication groove 50 on the end surface 21 s of the seal member main body 21, the processing for forming the communication groove 50 can be easily performed as compared with the case where the through hole is formed in the seal member main body 21. .
  • FIG. 9 is a cross-sectional view showing a configuration of a modification of the third embodiment of the shaft seal device.
  • the seal segment (seal ring piece) 20F of the shaft seal device 1F is a seal extending inward in the radial direction Dr from the inner peripheral surface 21f of the seal member main body 21.
  • the fins 26 and seal fins (seal bodies) 26F extending from the outer peripheral surface 102f of the rotor 102 to the outside in the radial direction Dr are alternately arranged at intervals in the central axis direction Da.
  • the seal segment 20F includes a guide surface 64.
  • the guide surface 64 is formed facing the upstream side of the flow F of the working fluid in the seal fin 26.
  • the rotor 102 includes seal fins 26 ⁇ / b> F that extend from the outer peripheral surface 102 f of the rotor 102 to the outside in the radial direction Dr.
  • the guide surface 67 is formed facing the upstream side of the flow F of the working fluid in the seal fin 26F.
  • the flow Ff of the working fluid that has flowed into the gap between the inner peripheral surface 21f of the seal member main body 21 and the outer peripheral surface 102f of the rotor 102 passes through the gap between the seal fin 26 and the outer peripheral surface 102f of the rotor 102, and then the guide surface 64.
  • it hits the guide surface 67 it winds up in a spiral shape and is guided outward in the radial direction Dr.
  • the working fluid efficiently flows into the branch groove 51.
  • the foreign matter that has entered the gap between the inner peripheral surface 21 f of the seal member main body 21 and the outer peripheral surface 102 f of the rotor 102 can be more reliably sent to the communication groove 50 through the branch groove 51.
  • the shaft seal device 1G is provided in an annular space between the rotor 102 and the stator 103, similarly to the shaft seal device 1A shown in the first embodiment.
  • the shaft seal device 1G includes a plurality of seal segments (seal ring pieces) 20G.
  • FIG. 10 is a view of the circumferential guide member provided in the facing portion between the fixed seal member and the seal segment as viewed from the central axis direction of the rotor in the fourth embodiment of the shaft seal device.
  • the seal segment 20 ⁇ / b> G includes a seal member main body 21, a thin plate seal 25, and seal fins 26.
  • the seal segment 20G includes a communication groove 50 on the end surface 21s of the seal member main body 21.
  • the communication groove 50 is formed in a groove shape extending along the end surface 21s and recessed inward in the circumferential direction Dc from the end surface 21s.
  • the communication groove 50 communicates the high pressure region S2 and the low pressure region S1.
  • the seal segment 20G includes a circumferential guide member 68.
  • the circumferential guide member 68 is provided on the downstream side of the flow Fg in the circumferential direction Dc of the working fluid generated outside the radial direction Dr of the rotor 102 when the rotor 102 rotates around the central axis with respect to the communication groove 50. Yes.
  • the circumferential guide member 68 is formed on the inner circumferential surface 21f of the seal member main body 21 of the seal segment 20C so as to protrude inward in the radial direction Dr.
  • the flow Fg of the working fluid in the circumferential direction Dc generated outside the radial direction Dr of the rotor 102 collides with the circumferential direction guide member 68, thereby communicating radially outside. Guided to the groove 50. As a result, the foreign matter can be more reliably fed into the communication groove 50. As a result, it is possible to suppress foreign matter from reaching the thin plate seal 25 and to suppress the thin plate seal 25 from being affected.
  • the communication groove 50 is provided in a portion where the working fluid leaks between the high pressure region S2 and the low pressure region S1 through the gap between the end surfaces 21s of the seal segment 20G. Accordingly, even if the working fluid leaks through the communication groove 50, the influence of the communication groove 50 can be reduced. Furthermore, by forming the communication groove 50 on the end surface 21 s of the seal member main body 21, the processing for forming the communication groove 50 can be easily performed as compared with the case where the through hole is formed in the seal member main body 21. .
  • the present invention is not limited to the above-described embodiments and modifications, and includes various modifications made to the above-described embodiments without departing from the spirit of the invention. That is, the specific shapes, configurations, and the like given in the embodiment are merely examples, and can be changed as appropriate.
  • the shaft seal devices 1A to 1G are provided with the thin plate seal 25 and the seal fin 26.
  • other seal structures are appropriately used. May be adopted.
  • the blade 61, the wall body 62, and the umbrella-shaped member 63 are formed between the seal fins 26 adjacent to each other in the central axis direction of the rotor 102 or between the seal fins 26 and 26F, and the flow F is formed on the branch groove 51 side. You may make it lead to.
  • shaft seal devices 1A to 1G described above are not limited to steam turbines and gas turbines but can be applied to other rotating machines.
  • This invention can be applied to a shaft seal device and a rotary machine. According to the present invention, the influence on the sealing characteristics can be suppressed, and the influence of foreign matters on the seal body can be reduced.

Landscapes

  • Sealing Devices (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
PCT/JP2017/031215 2017-03-23 2017-08-30 軸シール装置、回転機械 WO2018173316A1 (ja)

Applications Claiming Priority (2)

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JP2017-057979 2017-03-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114483209A (zh) * 2021-12-27 2022-05-13 东方电气集团东方汽轮机有限公司 一种汽轮机轴端汽封体密封结构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2023119448A (ja) * 2022-02-16 2023-08-28 三菱重工業株式会社 シール装置および回転機械

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11257014A (ja) * 1998-03-06 1999-09-21 Toshiba Corp 軸流タービンの作動流体漏洩防止装置
US20090297341A1 (en) * 2008-06-02 2009-12-03 General Electric Company Fluidic sealing for turbomachinery

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11257014A (ja) * 1998-03-06 1999-09-21 Toshiba Corp 軸流タービンの作動流体漏洩防止装置
US20090297341A1 (en) * 2008-06-02 2009-12-03 General Electric Company Fluidic sealing for turbomachinery

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114483209A (zh) * 2021-12-27 2022-05-13 东方电气集团东方汽轮机有限公司 一种汽轮机轴端汽封体密封结构
CN114483209B (zh) * 2021-12-27 2023-07-14 东方电气集团东方汽轮机有限公司 一种汽轮机轴端汽封体密封结构

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