Patent ID: 12247490

DESCRIPTION OF EMBODIMENTS

First Embodiment

Hereinafter, embodiments of a shaft sealing device and a rotary machine according to the present disclosure will be described with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments only.

(Configuration of Rotary Machine)

As illustrated inFIG.1, a rotary machine1according to the present embodiment is a gas turbine, for example. The rotary machine1includes a compressor2, a combustor3, a turbine4, a rotor5, and a shaft sealing device10A.

The compressor2compresses air by taking in a large amount of air. The combustor3burns fuel by mixing the fuel with the air compressed by the compressor2. The turbine4is introduced with combustion gas generated in the combustor3. The turbine4converts thermal energy of the introduced combustion gas into rotational energy, and generates power for rotating the rotor5around a central axis O. The rotor5extends in a columnar shape in an axial direction Da in which the central axis O extends. The rotor5transmits part of the power for rotating the turbine4to the compressor2to drive the compressor2.

More specifically, the turbine4includes a rotating blade7b, a stator vane6b, and a casing8. The rotating blade7bis disposed on an outer side Dro in a radial direction Dr with respect to the rotor5. The turbine4blows the combustion gas to the rotating blade7bto convert the thermal energy of the combustion gas into mechanical rotational energy and to generate power. The casing8is formed in a tubular shape extending in the axial direction Da. The stator vane6bis disposed on an inner side Dri in the radial direction Dr with respect to the casing8. The rotating blade7band the stator vane6bare alternately arranged in the axial direction Da. The rotating blade7breceives a pressure of the combustion gas flowing in the axial direction Da of the rotor5to rotate the rotor5around the central axis O. The rotational energy applied to the rotor5is taken out from a shaft end and used.

For convenience of the following description, the direction in which the central axis O extends is referred to as the axial direction Da. Further, the radial direction of the rotor5or the shaft sealing device10A based on the central axis is simply referred to as the radial direction Dr. Further, a side approaching the central axis O in the radial direction Dr is referred to as the inner side Dri in the radial direction Dr, and a side opposite to the inner side Dri in the radial direction Dr is referred to as the outer side Dro in the radial direction Dr. Further, the circumferential direction of the rotor5or the shaft sealing device10A about the central axis O is simply referred to as the circumferential direction Dc.

The compressor2is coaxially connected to the turbine4via the rotor5. The compressor2uses the rotation of the turbine4to compress outside air to generate compressed air. The compressor2supplies the generated compressed air to the combustor3. Similarly to the turbine4, the compressor2includes a stator vane6a, a rotating blade7a, and a casing9. The rotating blade7ais disposed on the outer side Dro in the radial direction Dr with respect to the rotor5. The casing9extends in a tubular shape in the axial direction Da. The stator vane6ais disposed on the inner side Dri in the radial direction Dr with respect to the casing9. The rotating blade7aand the stator vane6aare alternately arranged in the axial direction Da of the rotor5.

(Configuration of Shaft Sealing Device)

The shaft sealing device10A seals an annular space between the rotor5and a stator for covering the rotor5in order to reduce a leakage amount of a fluid leaking from a high-pressure side to a low-pressure side. In the turbine4, the shaft sealing device10A is disposed to reduce a leakage amount of the combustion gas leaking from the high-pressure side to the low-pressure side. The shaft sealing device10A is disposed in the turbine4between the stator vane6bof the turbine4and the rotor5, or between the casing8of the turbine4and the rotor5. In the compressor2, the shaft sealing device10A is disposed to reduce the leakage amount of the compressed air leaking from the high-pressure side to the low-pressure side. In the compressor2, the shaft sealing device10A is disposed between the stator vane6aof the compressor2and the rotor5, or between the casing9and the rotor5of the compressor2.

As illustrated inFIG.2, the shaft sealing device10A of the present embodiment has a plurality of (in the present embodiment, 8) divided bodies11extending in an arc shape. The shaft sealing device10A is formed in an annular shape in the circumferential direction Dc around the central axis O with the divided bodies11arranged in the circumferential direction Dc.

As illustrated inFIG.3, each divided body11of the shaft sealing device10A includes a housing30A, a sealing body20, a shim38, a side plate40, and a convex portion50.

The housing30A forms an outer shell in the shaft sealing device10A. The housing30A is disposed on the outer side Dro in the radial direction Dr at an interval with respect to the rotor5. As illustrated inFIG.1, the housing30A is disposed on the inner side Dri in the radial direction Dr with respect to the stator vanes6aand6b, the rotating blades7aand7b, and the casings8and9, which serve as the stator of the rotary machine1. The housing30A may be formed as a part of the stator vanes6aand6b, the rotating blades7aand7b, and the casings8and9, or may be formed as separate members.

As illustrated inFIG.2, the housing30A extends in the circumferential direction Dc around the central axis O. As illustrated inFIG.3, the housing30A has an accommodating groove31for accommodating a part of the sealing body20. The accommodating groove31is recessed from an inner peripheral surface30f, which faces the inner side in the radial direction Dr, to the outer side Dro in the radial direction Dr within the housing30A. The accommodating groove31has a main body accommodating portion32that accommodates a main body portion22of the sealing body20, which will be described later, and a head accommodating portion33that accommodates a head portion23of the sealing body20.

The main body accommodating portion32forms a space in the inner side Dri in the radial direction Dr within the accommodating groove31. The main body accommodating portion32is open at the inner peripheral surface30fof the housing30A. The head accommodating portion33forms a space in the outer side Dro in the radial direction Dr with respect to the main body accommodating portion32. The head accommodating portion33is connected to the main body accommodating portion32. The head accommodating portion33is formed to be widened on both sides in the axial direction Da with respect to the main body accommodating portion32. As a result, the accommodating groove31including the main body accommodating portion32and the head accommodating portion33forms a space having a T-shaped cross section when viewed from the circumferential direction Dc.

The sealing body20is formed by laminating a plurality of thin plates21constituting a leaf seal in the circumferential direction Dc. Each of the plurality of thin plates21is formed of a metal plate. The plurality of thin plates21are disposed with a minute gap in the circumferential direction Dc. Each of the thin plates21is disposed along a plane orthogonal to the circumferential direction Dc and the radial direction. When viewed from the axial direction Da, each of the thin plates21is obliquely disposed in a radiation direction (radial direction Dr) about the central axis O. Each of the thin plates21obliquely extends from the other side to one side in the circumferential direction Dc from the outer side Dro toward the inner side Dri in the radial direction Dr. The thin plates21are joined to each other by, for example, welding at an end portion on the outer side Dro in the radial direction Dr. The sealing body20formed of the plurality of thin plates21extends in the circumferential direction Dc as a whole in one divided body11, and is formed in an arc shape when viewed from the axial direction Da.

The sealing body20has the main body portion22and the head portion23. The main body portion22has a constant width dimension W1in the axial direction Da when viewed from the circumferential direction Dc. The main body portion22extends in the radial direction Dr longer than the width dimension W1. The main body portion22has a rectangular shape in the radial direction Dr that is longer than that in the axial direction Da when viewed from the circumferential direction Dc. The head portion23is formed on the outer side Dro in the radial direction Dr with respect to the main body portion22. The head portion23is formed integrally with the main body portion22. The head portion23protrudes to both sides of the main body portion22in the axial direction Da when viewed from the circumferential direction Dc. A width dimension W2of the head portion23in the axial direction Da is larger than the width dimension W1of the main body portion22. The head portion23has a rectangular shape in the axial direction Da that is longer than that in the radial direction Dr when viewed from the circumferential direction Dc.

The sealing body20has a first concave portion24A and a second concave portion24B, which are recessed in the axial direction Da, on an end portion on the outer side Dro in the radial direction Dr of the main body portion22. The end portion of the main body portion22on the outer side Dro in the radial direction Dr is an end portion close to a boundary between the main body portion22and the head portion23. The first concave portion24A is formed in a surface of the main body portion22facing a first side Da1in the axial direction Da. The first concave portion24A is formed to be recessed on a second side Da2in the axial direction Da. The second concave portion24B is formed in the surface of the main body portion22facing the second side Da2in the axial direction Da. The second concave portion24B is formed to be recessed on the first side Da1in the axial direction Da. The second concave portion24B is formed at the same position as the first concave portion24A in the radial direction Dr when viewed from the circumferential direction Dc. Therefore, when viewed in the circumferential direction Dc, the main body portion22has a length in the axial direction Da that is shorter than the width dimension W1only in a region where the first concave portion24A and the second concave portion24B are formed.

In the sealing body20, an outer peripheral end portion20ton the outer side Dro in the radial direction Dr is accommodated in the accommodating groove31. The outer peripheral end portion20tis an end of the head portion23on the outer side Dro in the radial direction. In the sealing body20, most of the main body portion22is accommodated in the main body accommodating portion32, and the head portion23is accommodated in the head accommodating portion33. In the sealing body20, an inner peripheral end portion20sof the main body portion22on the inner side Dri in the radial direction Dr protrudes from the inner peripheral surface30fof the housing30A to the inner side Dri in the radial direction Dr. The inner peripheral end portion20sis an end of the main body portion22on the inner side Dri in the radial direction. As a result, the inner peripheral end portion20sof the sealing body20is disposed to come into slidable contact with an outer peripheral surface5fof the rotor5. That is, ends of the plurality of thin plates21on the inner side Dri in the radial direction Dr are disposed to come into slidable contact with the outer peripheral surface5fof the rotor5.

The sealing body20seals an annular space100between the rotor5and the housing30A so as to partition the annular space100into a high-pressure region H on the first side Da1in the axial direction Da and a low-pressure region L on the second side Da2in the axial direction Da. The high-pressure region H is a region where the pressure is higher than that in the low-pressure region L. The positions of the high-pressure region H and the low-pressure region L in the axial direction Da may differ depending on the position where the shaft sealing device10A is disposed. Therefore, the first side Da1of the shaft sealing device10A in the axial direction Da (a side of the sealing body20where the high-pressure region H is positioned) and the second side Da2(a side of the sealing body20where the low-pressure region L is positioned) may be opposite to those inFIG.3when viewed based on the rotary machine1.

In the accommodating groove31, the main body portion22has a sealing body high-pressure-side side surface22ffacing the first side Da1in the axial direction Da, and a sealing body low-pressure-side side surface22gfacing the second side Da2in the axial direction Da. In fact, the sealing body high-pressure-side side surface22fand the sealing body low-pressure-side side surface22gare regions where side surfaces of the plurality of thin plates21are assembled, and are not one continuous surface.

Moreover, the accommodating groove31in which the sealing body20is accommodated has a low-pressure-side facing surface (facing surface)32gfacing the second side Da2in the axial direction Da at an interval with respect to the sealing body low-pressure-side side surface22g. That is, the low-pressure-side facing surface32gis a surface facing the first side Da1in the axial direction Da. An end portion32sof the low-pressure-side facing surface32gon the inner side Dri in the radial direction Dr is disposed at a position protruding from the inner peripheral surface30fto the inner side Dri in the radial direction Dr so as to be positioned closest to the rotor5in the radial direction Dr within the housing30A.

Furthermore, the accommodating groove31has a high-pressure-side facing surface32ffacing the first side Da1in the axial direction Da with respect to the sealing body high-pressure-side side surface22fat an interval. That is, the high-pressure-side facing surface32fis a surface facing the second side Da2in the axial direction Da. An end portion32aof the high-pressure-side facing surface32fon the inner side Dri in the radial direction Dr is disposed at a position protruding from the inner peripheral surface30fto the inner side Dri in the radial direction Dr so as to be positioned closest to the rotor5in the radial direction Dr within the housing30A. In the present embodiment, the end portion32aof the high-pressure-side facing surface32fis disposed at approximately the same position as the end portion32sof the low-pressure-side facing surface32gin the radial direction Dr.

The low-pressure-side facing surface32gand the high-pressure-side facing surface32fform a part of the inner peripheral surface of the accommodating groove31. More specifically, the low-pressure-side facing surface32gand the high-pressure-side facing surface32fform a part of the main body accommodating portion32. The main body portion22of the sealing body20is disposed with a gap in the axial direction Da with respect to both the low-pressure-side facing surface32gand the high-pressure-side facing surface32fof the accommodating groove31. In the sealing body20, the head portion23is formed on the outer side Dro in the radial direction Da, which is closer to the sealing body high-pressure-side side surface22fand the sealing body low-pressure-side side surface22g.

Moreover, the head accommodating portion33in which the head portion23is accommodated has an outer peripheral contact surface33hfacing the outer side Dro in the radial direction Dr. The head portion23comes into contact with the outer peripheral contact surface33hin the head accommodating portion33from the outer side Dro in the radial direction Dr. The outer peripheral contact surface33his formed on a part that extends to both sides of the main body accommodating portion32in the axial direction Da. That is, the outer peripheral contact surface33hextends from the end portion of the low-pressure-side facing surface32gon the outer side Dro in the radial direction Dr toward the second side Da2in the axial direction Da, when viewed from the circumferential direction Dc.

The shim38is a thin plate-shaped member. The shim38is disposed on the outer side Dro in the radial direction Dr with respect to the head portion23. The shim38is disposed in the head accommodating portion33in a direction in which the radial direction Dr is a thickness direction. The shim38is disposed on the outer side Dro in the radial direction Dr with respect to the head portion23. A plurality of shims38(for example, 5 in the present embodiment) are laminated in the radial direction Dr as needed. The shim38restricts movement of the head portion23to the outer side Dro in the radial direction Dr within the head accommodating portion33. The plurality of shims38restrict the movement of the sealing body20to the outer side Dro in the radial direction Dr by a certain dimension or more.

The side plate40is disposed on the first side Da1in the axial direction Da with respect to the sealing body20. Only one side plate40of the present embodiment is disposed only on the first side Da1in the axial direction Da with respect to the sealing body20. The side plate40is disposed in the accommodating groove31along the sealing body high-pressure-side side surface22f. The side plate40extends in the circumferential direction Dc and the radial direction Dr. An end portion40aof the side plate40on the inner side Dri in the radial direction Dr is disposed at substantially the same position as the end portion32aof the high-pressure-side facing surface32fon the inner side Dri in the radial direction Dr. The side plate40has an engaging convex portion41that engages with the first concave portion24A on the outer side Dro in the radial direction Dr. The engaging convex portion41is a region of the side plate40that protrudes to the second side Da2in the axial direction Da. The engaging convex portion41is formed on the side plate40to include an end portion on the outer side Dro in the radial direction Dr.

The convex portion50restricts the movement of the sealing body20to the second side Da2in the axial direction Da between the housing30A and the sealing body20. In the accommodating groove31, the convex portion50is formed on any one of the housing30A and the sealing body20. In the present embodiment, the convex portion50is formed on, for example, the low-pressure-side facing surface32gof the housing30A. The convex portion50protrudes from the low-pressure-side facing surface32gto the first side Da1in the axial direction Da. The convex portion50extends in the circumferential direction Dc. The convex portion50is disposed on the outer side Dro in the radial direction Dr, which is closer to the end portion32sof the low-pressure-side facing surface32gon the inner side Dri in the radial direction Dr, when viewed from the circumferential direction Dc. The convex portion50is disposed on the outer side Dro in the radial direction Dr, which is closer to the end portion40aof the side plate40on the inner side Dri in the radial direction Dr, when viewed from the circumferential direction Dc. Therefore, the convex portion50abuts against the sealing body low-pressure-side side surface22gto restrict the movement of the sealing body20to the second side Da2in the axial direction Da.

The convex portion50may be formed on the sealing body20. In this case, the convex portion50is formed on the sealing body low-pressure-side side surface22gof the sealing body20to protrude to the second side Da2in the axial direction Da. The convex portion50abuts against the low-pressure-side facing surface32gto restrict the movement of the sealing body20to the second side Da2in the axial direction Da.

Moreover, in the accommodating groove31, the convex portion50partitions a space between the low-pressure-side facing surface32gand the sealing body low-pressure-side side surface22ginto a first space portion201on the outer side Dro in the radial direction Dr and a second space portion202on the inner side Dri in the radial direction Dr. The first space portion201is a space adjacent to the head accommodating portion33on the outer side Dro in the radial direction Dr. The second space portion202is a space communicating with the low-pressure region L on the inner side Dri in the radial direction Dr.

In the present embodiment, a dimension S1of the first space portion201in the axial direction Da is set to, for example, 0.1 to 0.3 mm.

A dimension S3of the second space portion202in the axial direction Da is, for example, preferably 2.0 times to 4.0 times the dimension S1of the first space portion201. In the present embodiment, the dimension S3is set to, for example, 0.2 to 0.6 mm.

Moreover, a dimension S4of the second space portion202in the radial direction Dr is preferably a constant value regardless of a size of the shaft sealing device10A. For example, when the dimension S4has a design value of about 5.0 mm, it is preferable that the dimension S4is within a range of about a 10 to 30% increase or decrease with respect to the design value. Therefore, in the present embodiment, the dimension S4is set to, for example, about 2 to 8 mm.

Moreover, a dimension S2of the first space portion201in the radial direction Dr preferably has about 70 to 90% of the length of the main body portion22in the radial direction Dr (a length from a connection position between the main body portion22and the head portion23to the inner peripheral end portion20sinFIG.3). In addition, the dimension S4in the radial direction Dr is preferably about 10 to 30% with respect to the length of the main body portion22in the radial direction Dr.

The housing30A further has a communication portion60A which allows the low-pressure region L and the inside of the accommodating groove31to communicate with each other. The communication portion60A allows the first space portion201and the low-pressure region L to communicate with each other. In the present embodiment, the communication portion60A has at least one communication hole61formed such that one end thereof is open at the low-pressure-side facing surface32gand the other end is open at an outer surface of the housing30A facing the low-pressure region L. The communication hole61is connected to the low-pressure-side facing surface32gon the outer side Dro in the radial direction Dr with respect convex portion50. In the present embodiment, the communication hole61extends obliquely toward the inner side Dri in the radial direction Dr from the first side Da1toward the second side Da2in the axial direction Da. Only one communication hole61is formed in the low-pressure-side facing surface32g. The communication hole61is not limited to having an obliquely extended shape. The communication hole61may extend parallel to the central axis O from the first side Da1toward the second side Da2in the axial direction Da.

(Operational Effect)

In the shaft sealing device10A and the rotary machine1having the above configuration, as illustrated inFIG.3, a high-pressure working fluid exists in a region of the sealing body20on the first side Da1in the axial direction Da, which is the high-pressure region H. The region of the sealing body20on the second side in the axial direction Da, which is the low-pressure region L, is in a state in which a pressure is lower than that in the high-pressure region H. Therefore, a flow of the working fluid from the high-pressure region H in the axial direction Da toward the low-pressure region L through a space between the thin plates21is generated through a slight gap between the thin plates21constituting the sealing body20.

Moreover, the convex portion50partitions a space between the low-pressure-side facing surface32gand the sealing body low-pressure-side side surface22ginto a first space portion201on the outer side Dro in the radial direction Dr and a second space portion202on the inner side Dri in the radial direction Dr. The second space portion202is connected to the low-pressure region L, and has a low pressure equivalent to that of the low-pressure region L. The low-pressure region L and the first space portion201communicate through the communication portion60A, so that the first space portion201also has a low pressure equivalent to that of the low-pressure region L. Therefore, the first space portion201and the second space portion202have a pressure difference with reference to the high-pressure region H positioned with the sealing body20interposed therebetween in the axial direction Da. Thus, a first flow F1of the working fluid toward the first space portion201and a second flow F2of the working fluid toward the second space portion202are generated as a flow from the high-pressure region H toward the low-pressure region L.

The first flow F1of the working fluid flowing from the high-pressure region H toward the first space portion201flows obliquely toward the outer side Dro in the radial direction Dr from the first side Da1toward the second side Da2in the axial direction Da, as compared with the second flow F2. The sealing body20is pressed by the first flow F1so as to float slightly to the outer side Dro in the radial direction Dr with respect to the outer peripheral surface5fof the rotor5. As a result, it is possible to suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20is suppressed.

Moreover, the second space portion202is formed to be connected to the low-pressure region L at a position close to the outer peripheral surface5fof the rotor5. Therefore, the second flow F2of the working fluid from the high-pressure region H toward the second space portion202flows relatively straight from the first side Da1to the second side Da2in the axial direction Da so as to follow the outer peripheral surface5fof the rotor5, as compared with the first flow F1. The first flow F1obliquely flowing toward the outer side Dro in the radial direction Dr and the second flow F2flowing in a direction different to that of the first flow F1can sufficiently secure a force that floats the sealing body20to the outer side Dro in the radial direction Dr. As a result, it is possible to stably suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20can be suppressed more effectively.

Moreover, the convex portion50abuts against the sealing body20to suppress the movement of the sealing body20to the second side Da2in the axial direction Da. Therefore, the sealing body20is suppressed from losing its posture in the accommodating groove31. As a result, the sealing body20is tilted in the accommodating groove31, thereby suppressing the formation of a gap which connects the high-pressure region H to the first space portion201through the inside of the accommodating groove31. Therefore, it is possible to suppress the working fluid from flowing from the high-pressure region H to the first space portion201while going around the sealing body20from the head accommodating portion33in the accommodating groove31. As a result, even when the number of components constituting the shaft sealing device10A is reduced without providing a separate member such as a holding ring or a low-pressure side seal, the flow of the working fluid around the sealing body20can be appropriately maintained. Accordingly, it is possible to reduce the number of components and to reduce costs while suppressing wear of the sealing body20. Furthermore, by providing the shaft sealing device10A, it is possible to provide the rotary machine1capable of reducing costs while suppressing wear of the sealing body20.

Moreover, the convex portion50is disposed on the outer side Dro in the radial direction Dr with respect to the end portion40aof the side plate40on the inner side Dri in the radial direction Dr disposed along the sealing body high-pressure-side side surface22f. Accordingly, the first space portion201is formed on the outer side Dro in the radial direction Dr, which is close to the end portion40aof the side plate40. Therefore, the first space portion201is largely positioned on the outer side Dro in the radial direction Dr with respect to the high-pressure region H which is an inlet. Thus, the first flow F1of the working fluid from the high-pressure region H toward the first space portion201is a flow that is further toward the outer side Dro in the radial direction Dr. As a result, a force of floating the sealing body20to the outer peripheral surface5fof the rotor5due to the first flow F1becomes stronger. As a result, it is possible to stably suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20can be suppressed more effectively.

Moreover, the convex portion50is formed on the low-pressure-side facing surface32g. Accordingly, the sealing body low-pressure-side side surface22gabuts against the convex portion50formed on the low-pressure-side facing surface32gto restrict the movement of the sealing body20to the second side Da2in the axial direction Da. Therefore, it is possible to suppress a posture of the sealing body20from collapsing in the accommodating groove31. In addition by forming the convex portion50on the housing30A, it is possible to reduce the complexity of the shape of the plurality of thin plates21constituting the sealing body20. Accordingly, the sealing body20can be manufactured at low costs.

Moreover, the communication portion60A has the communication hole61formed such that one end thereof is open at the low-pressure-side facing surface32gand the other end is open at the outer surface of the housing30A facing the low-pressure region L. Accordingly, the first space portion201communicates with the low-pressure region L through the communication hole61. Therefore, the pressure inside the first space portion201can be made equivalent to that of the low-pressure region L with a simple structure.

Moreover, the head portion23of the sealing body20comes into contact with the outer peripheral contact surface33hfrom the outer side Dro in the radial direction Dr of the head accommodating portion33. The posture of the sealing body20in the accommodating groove31is maintained not only by the convex portion50but also by the head portion23. Therefore, the sealing body20is tilted in the accommodating groove31, thereby suppressing the formation of a gap which connects the high-pressure region H to the first space portion201through the inside of the accommodating groove31. Furthermore, the head portion23comes into contact with the outer peripheral contact surface33hof the head accommodating portion33, so that it is possible to suppress the flow of the high-pressure working fluid from the high-pressure region H into the first space portion201that has passed through the head accommodating portion33. Accordingly, it is possible to stably suppress the working fluid from flowing from the high-pressure region H to the first space portion201while going around the sealing body20from the head accommodating portion33in the accommodating groove31.

First Modification Example of First Embodiment

In the first embodiment, the communication portion60A has only one communication hole61, but the configuration of the communication portion is not limited to such a structure.

For example, as illustrated inFIGS.4and5, a housing30B of a shaft sealing device10B includes a plurality of communication holes62as a communication portion60B. Each communication hole62extends in the axial direction Da, for example, so that one end thereof is open at the low-pressure-side facing surface32gand the other end is open at the outer surface of the housing30B facing the low-pressure region L. In this case, as illustrated inFIG.5, the communication holes62are formed at equal intervals in the circumferential direction Dc on the outer side Dro in the radial direction Dr with respect to the convex portion50. The communication hole62is not limited to having a shape extending parallel with the central axis O from the first side Da1toward the second side Da2in the axial direction Da. A plurality of communication holes62may extend obliquely toward the inner side Dri in the radial direction Dr from the first side Da1toward the second side Da2in the axial direction Da.

Accordingly, the first space portion201is connected to the low-pressure region L through the plurality of communication holes62, one end of which being open at the low-pressure-side facing surface32gand the other of which being open at the outer surface of the housing30B facing the low-pressure region L. Therefore, as in the first embodiment, the pressure inside the first space portion201can be made equivalent to that of the low-pressure region L. Furthermore, the first space portion201is connected to the low-pressure region L through the plurality of communication holes62, so that it is possible to suppress variation in pressure inside the first space portion201as compared with a case in which the first space portion201is connected to the low-pressure region L through one communication hole61. Thus, the pressure inside the first space portion201can be reduced to a low pressure under a uniform pressure state.

Second Modification Example of First Embodiment

As illustrated inFIGS.6and7, a housing30C of a shaft sealing device10cincludes a communication groove63as a communication portion60C. The communication groove63is formed to pass therethrough the convex portion50in the radial direction Dr and allow the first space portion201and the second space portion202to communicate with each other. A plurality of communication grooves63are formed at intervals in the circumferential direction Dc.

Accordingly, the first space portion201communicates with the second space portion202through the communication groove63through which the convex portion50passes in the radial direction Dr. The second space portion202is connected to the low-pressure region L. Thus, the first space portion201is indirectly connected to the low-pressure region L via the second space portion202. Therefore, as in the first embodiment, the pressure inside the first space portion201can be made equivalent to that of the low-pressure region L. Furthermore, the communication groove63is formed as a groove recessed from the convex portion50, so that processing becomes easier than forming a through-hole that passes through the housing30A, such as the communication hole61or62. Therefore, the communication portion600can be formed more simply.

Furthermore, the second space portion202is connected to the low-pressure region L through the plurality of communication grooves63, so that it is possible to suppress variation in pressure inside the first space portion201as compared with a case in which the second space portion202is connected to the low-pressure region L through one communication groove63. Thus, the pressure inside the first space portion201can be reduced to a low pressure under a uniform pressure state.

The communication grooves63are not limited to the structure in which a plurality of the communication grooves63are formed at intervals in the circumferential direction Dc. Only one communication groove63may be formed in the convex portion50.

Second Embodiment

Next, a second embodiment of a shaft sealing device10D according to the present disclosure will be described. In the second embodiment to be described later, the same reference numerals are given to the configurations common to the configurations of the first embodiment in the drawings, and the description thereof will be omitted. The second embodiment is different from the first embodiment in that an outer peripheral convex portion70is provided.

As illustrated inFIGS.8and9, a housing30D of the shaft sealing device10D of the second embodiment further includes the outer peripheral convex portion70. The outer peripheral convex portion70is disposed on the outer side Dro in the radial direction Dr with respect to the convex portion50. The outer peripheral convex portion70is formed at an end portion of the low-pressure-side facing surface32gon the outer side Dro in the radial direction Dr. The outer peripheral convex portion70is formed to protrude from the low-pressure-side facing surface32gto the first side Da1in the axial direction Da. The outer peripheral convex portion70protrudes in the axial direction Da by the same protrusion amount as the convex portion50with respect to the low-pressure-side facing surface32g. The outer peripheral convex portion70has a first surface70afacing the first side Da1in the axial direction Da. The first surface70aabuts against the sealing body low-pressure-side side surface22gof the sealing body20. In addition, the outer peripheral convex portion70has a second surface70bfacing the outer side Dro in the radial direction Dr. The second surface70babuts against the head portion23of the sealing body20from the inner side Dri in the radial direction Dr. That is, the second surface70bforms a surface that is continuous with the outer peripheral contact surface33h.

In the second embodiment, the first space portion201is formed on the outer side Dro in the radial direction Dr of the convex portion50and on the inner side Dri in the radial direction Dr of the outer peripheral convex portion70.

As illustrated inFIG.9, the plurality of divided bodies11constituting the shaft sealing device10D have a seam J that is formed between the adjacent divided bodies11in the circumferential direction Dc. The seam J obliquely and linearly extends in the radial direction Dr when viewed from the axial direction Da. In the embodiment, the seam J between the adjacent divided bodies11extends obliquely from one side to the other side in the circumferential direction Dc from the inner side Dri toward the outer side Dro in the radial direction Dr.

In the shaft sealing device10D, a seam convex portion90is formed in a region overlapping with the seam J of the adjacent divided bodies11when viewed in the axial direction Da. The seam convex portion90is formed in each of one divided body (first divided body)11A and the other divided body (second divided body)11B among adjacent divided bodies11in the circumferential direction Dc. A seam convex portion90A formed on one divided body11A and a seam convex portion90B formed on the other divided body11B extend along the seam J from the inner side Dri to the outer side Dro in the radial direction Dr, respectively. Similarly to the convex portion50and the outer peripheral convex portion70, the seam convex portion90protrudes from the low-pressure-side facing surface32gto the first side Da1in the axial direction Da. In this case, the convex portion50, the outer peripheral convex portion70, and the seam convex portion90preferably have the same protrusion dimensions from the low-pressure-side facing surface32gto the first side Da1in the axial direction Da. In addition, when viewed in the axial direction Da, a connecting part between the convex portion50and the seam convex portion90or a connecting part between the outer peripheral convex portion70and the seam convex portion90may be formed with an R portion95that forms a smooth curved surface.

When the seam convex portion90is formed, it is not limited to a structure in which both the convex portion50and the outer peripheral convex portion70are formed. For example, even when the seam convex portion90is formed, a structure may be such that the outer peripheral convex portion70is not formed and only the convex portion50is formed.

In the configuration as described above, the convex portion50and the outer peripheral convex portion70abut against the sealing body low-pressure-side side surface22g. Accordingly, the posture of the sealing body20is maintained in the accommodating groove31not only by the convex portion50but also by the outer peripheral convex portion70disposed on the outer side Dro in the radial direction Dr with respect to the convex portion50. Since the posture is maintained at two positions, the convex portion50and the outer peripheral convex portion70separated from each other in the radial direction Dr, the posture of the sealing body20can be maintained in a more stable posture in the accommodating groove31.

Moreover, the outer peripheral convex portion70has a first surface70athat abuts against the sealing body low-pressure-side side surface22g, and a second surface70bthat abuts against the head portion23of the sealing body20from the inner side Dri in the radial direction Dr. Therefore, the working fluid reaching the first space portion201can be blocked at two positions of the first surface70aand the second surface70bsuch that the working fluid passes from the high-pressure region H through the head accommodating portion33and then goes around the sealing body20. Therefore, the first space portion201can be stably maintained in a low-pressure state.

Moreover, the seam convex portion90is formed at a part of the seam J between the divided bodies11. Accordingly, in each of the divided bodies11adjacent to each other in the circumferential direction Dc, the first space portion201is in a state of not being connected to (a state of not communicating with) a part of the seam J of the divided bodies11. Thus, it is possible to suppress the working fluid in the first space portion201from leaking from the seam J to the outside of the housing30D. As a result, it is possible to suppress the pressure state in the first space portion201from being changed by the seam J of the divided body11.

Moreover, the connecting part between the convex portion50and the seam convex portion90or the connecting part between the outer peripheral convex portion70and the seam convex portion90are formed with an R portion95that forms a smooth curved surface. As a result, restrictions on tools when the seam convex portion90is formed on the convex portion50and the outer peripheral convex portion70can be reduced. As a result, the convex portion50, the outer peripheral convex portion70, and the seam convex portion90are likely to be integrally formed.

Modification Example of Second Embodiment

In the second embodiment, the outer peripheral convex portion70is formed at a position where the outer peripheral convex portion70abuts against the sealing body low-pressure-side side surface22g. However, the structure of the outer peripheral convex portion is not limited to such a structure.

For example, as illustrated inFIG.10, in a housing30E of a shaft sealing device10E, an outer peripheral convex portion71may be inserted into the second concave portion24B of the sealing body20. In this case, when the sealing body20moves to the second side Da2in the axial direction Da, a tip portion of the outer peripheral convex portion71abuts against the main body portion22of the sealing body20in the second concave portion24B.

Third Embodiment

Next, a third embodiment of a shaft sealing device according to the present disclosure will be described. In the second embodiment to be described later, the same reference numerals are given to the configurations common to the configurations of the first and second embodiments in the drawings, and the description thereof will be omitted. The third embodiment is different from the first embodiment in that a biasing member80is further provided.

As illustrated inFIG.11, a shaft sealing device10F of the third embodiment further includes the biasing member80that biases the sealing body20to the inner side Dri in the radial direction Dr within a housing30F. The biasing member80is disposed inside the head accommodating portion33of the accommodating groove31. The biasing member80includes, for example, a biasing member body81made of a coil spring and a fixing member82that fixes the biasing member body81.

The biasing member body81is housed in an insertion hole30hthat is formed in the housing30F to be recessed in the radial direction Dr with respect to the head accommodating portion33such that the biasing member body81is open in the head accommodating portion33. The fixing member82is fastened and fixed to the housing30F by being screwed into a female screw part formed in the insertion hole30h. The biasing member body81is sandwiched between the fixing member82and the shim38in a compressed state, thereby biasing the sealing body20to the inner side Dri in the radial direction Dr with respect to the housing30F.

By providing the biasing member80as described above, the sealing body20is in a state of being pushed toward the inner side Dri in the radial direction Dr while facing the outer peripheral surface5fof the rotor5. As a result, when the sealing body20is accommodated in the accommodating groove31, excessive movement of the sealing body20to the outer side Dro in the radial direction Dr is suppressed by a reaction force when the inner peripheral end portion20sof the sealing body20comes into contact with the outer peripheral surface5fof the rotor5. Accordingly, it is possible to suppress an excessive increase of a gap between the inner peripheral end portion20sof the sealing body20and the outer peripheral surface5fof the rotor5during operation of the compressor2or the turbine4. Therefore, it is possible to stably maintain a state in which the inner peripheral end portion20sof the sealing body20appropriately comes into slidable contact with the outer peripheral surface5fof the rotor5and exhibits good sealing performance.

Other Embodiments

The embodiments of the present disclosure have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments of the present disclosure, and includes design changes and the like without departing from the gist of the present disclosure.

In the embodiment, an example of the rotary machine1includes a gas turbine, but is not limited thereto. Examples of the rotary machine1include a large-scale fluid machine such as a steam turbine, a compressor, a water wheel, a chiller, and a pump.

APPENDIX

The shaft sealing devices10A to10F and the rotary machine1described in each embodiment are understood as follows, for example.

(1) According g to a first aspect, shaft sealing devices10A to10F includes: housings30A to30F which are disposed on an outer side Dro in a radial direction Dr at an interval with respect to a rotor5being rotatable around a central axis O, extends in a circumferential direction Dc around the central axis O, and has an accommodating groove31that is recessed to the outer side Dro in the radial direction Dr; a sealing body20which has a plurality of thin plates21laminated in the circumferential direction Dc, in which an outer peripheral end portion20ton the outer side Dro in the radial direction Dr is accommodated in the accommodating groove31, and in which an inner peripheral end portion20son an inner side Dri in the radial direction Dr extends from the housings30A to30F to the inner side Dri in the radial direction Dr to come into slidable contact with an outer peripheral surface5fof the rotor5; and a convex portion50which protrudes in an axial direction Da in which the central axis O extends from any one of the housings30A to30F and the sealing body20toward the other in the accommodating groove31, in which the sealing body20partitions an annular space100between the rotor5and the housings30A to30F into a high-pressure region H on a first side Da1in the axial direction Da and a low-pressure region L on a second side Da2in the axial direction Da, the sealing body20has a sealing body low-pressure-side side surface22gfacing the second side Da2in the axial direction Da within the accommodating groove31, the housings30A to30F have a facing surface32gwhich forms a part of the accommodating groove31and faces the sealing body low-pressure-side side surface22gat an in the a interval axial direction Da, and communication portion60A which allows the low-pressure region L and an inside of the accommodating groove31to communicate with each other, the convex portion50is formed on the facing surface32gor the sealing body low-pressure-side side surface22g, and partitions a space between the facing surface32gand the sealing body low-pressure-side side surface22ginto a first space portion201on the outer side Dro in the radial direction Dr and a second space portion202on the inner side Dri in the radial direction Dr, and the communication portion60A allows the first space portion201and the low-pressure region L to communicate with each other.

In the shaft sealing devices10A to10F, the convex portion50partitions a space between the facing surface32gand the sealing body low-pressure-side side surface22ginto a first space portion201on the outer side Dro in the radial direction Dr and a second space portion202on the inner side Dri in the radial direction Dr. The second space portion202is connected to the low-pressure region L, and has a low pressure equivalent to that of the low-pressure region L. The low-pressure region L and the first space portion201communicate through the communication portion60A, so that the first space portion201also has a low pressure equivalent to that of the low-pressure region L. Therefore, the first space portion201and the second space portion202have a pressure difference with reference to the high-pressure region H positioned with the sealing body20interposed therebetween in the axial direction Da. Thus, a first flow F1of the working fluid toward the first space portion201and a second flow F2of the working fluid toward the second space portion202are generated as a flow from the high-pressure region H toward the low-pressure region L.

The first flow F1of the working fluid flowing from the high-pressure region H toward the first space portion201flows obliquely toward the outer side Dro in the radial direction Dr from the first side Da1toward the second side Da2in the axial direction Da, as compared with the second flow F2. The sealing body20is pressed by the first flow F1so as to float slightly to the outer side Dro in the radial direction Dr with respect to the outer peripheral surface5fof the rotor5. As a result, it is possible to suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20is suppressed.

Moreover, the second space portion202is formed to be connected to the low-pressure region L at a position close to the outer peripheral surface5fof the rotor5. Therefore, the second flow F2of the working fluid from the high-pressure region H toward the second space portion202flows relatively straight from the first side Da1to the second side Da2in the axial direction Da so as to follow the outer peripheral surface5fof the rotor5, as compared with the first flow F1. The first flow F1obliquely flowing toward the outer side Dro in the radial direction Dr and the second flow F2flowing in a direction different to that of the first flow F1can sufficiently secure a force that floats the sealing body20to the outer side Dro in the radial direction Dr. As a result, it is possible to stably suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20can be suppressed more effectively.

Moreover, the convex portion50suppresses the movement of the sealing body20to the second side Da2in the axial direction Da. Therefore, the sealing body20is suppressed from losing its posture in the accommodating groove31. As a result, the sealing body20is tilted in the accommodating groove31, thereby suppressing the formation of a gap which connects the high-pressure region H to the first space portion201through the inside of the accommodating groove31. Therefore, it is possible to suppress the working fluid from flowing from the high-pressure region H to the first space portion201while going around the sealing body20in the accommodating groove31. As a result, even when the number of components constituting the shaft sealing device10A is reduced without providing a separate member such as a holding ring or a low-pressure side seal, the flow of the working fluid around the sealing body20can be appropriately maintained. Accordingly, it is possible to reduce the number of components and to reduce costs while suppressing wear of the sealing body20.

(2) According to a second aspect, shaft sealing devices10A to10F are the shaft sealing devices10A to10F of (1), in which the shaft sealing devices10A to10F further include a side plate40which is disposed on the first side Da1in the axial direction Da with respect to the sealing body20, in which the sealing body20has a sealing body high-pressure-side side surface22ffacing the first side Da1in the axial direction Da, the side plate40is disposed along the sealing body high-pressure-side side surface22fin the accommodating groove31, and the convex portion50is disposed on the outer side Dro in the radial direction Dr, which is closer to an end portion40aof the side plate40on the inner side Dri in the radial direction Dr.

Accordingly, the first space portion201is largely positioned on the outer side Dro in the radial direction Dr with respect to the high-pressure region H which is an inlet. Thus, the first flow F1of the working fluid from the high-pressure region H toward the first space portion201is a flow that is further toward the outer side Dro in the radial direction Dr. As a result, a force of floating the sealing body20to the outer peripheral surface5fof the rotor5due to the first flow F1becomes stronger. As a result, it is possible to stably suppress the inner peripheral end portion20sof the sealing body20from coming into strong contact with the outer peripheral surface5fof the rotor5. Therefore, wear of the sealing body20can be suppressed more effectively.

(3) According to a third aspect, shaft sealing devices10A to10F are the shaft sealing devices10A to10F of (1) or (2), in which the convex portion50is formed on the facing surface32gto protrude to the first side Da1in the axial direction Da, and abuts against the sealing body low-pressure-side side surface22gto restrict movement of the sealing body20to the second side Da2in the axial direction Da.

Accordingly, the sealing body low-pressure-side side surface22gabuts against the convex portion50formed on the facing surface32gto restrict the movement of the sealing body20to the second side Da2in the axial direction Da. Therefore, it is possible to suppress a posture of the sealing body20from collapsing in the accommodating groove31. In addition by forming the convex portion50on the housing30A, it is possible to reduce the complexity of the shape of the plurality of thin plates21constituting the sealing body20. Accordingly, the sealing body20can be manufactured at low costs.

(4) According to a fourth aspect, shaft sealing devices10A and10B are the shaft sealing devices10A and10B according to any one of (1) to (3), in which the communication portions60A and60B have communication holes61and62formed such that one end thereof is open at the facing surface32gand the other end is open at an outer surface of the housings30A and30B that face the low-pressure region L.

Accordingly, the first space portion201communicates with the low-pressure region L through the communication hole61. Therefore, the pressure inside the first space portion201can be made equivalent to that of the low-pressure region L with a simple structure.

(5) According to a fifth aspect, a shaft sealing device10B is the shaft sealing device10B of (4), in which a plurality of communication holes62are formed while being spaced apart from each other in the circumferential direction.

As described above, the first space portion201is connected to the low-pressure region L through the plurality of communication holes62, so that it is possible to suppress variation in pressure inside the first space portion201as compared with a case in which the first space portion201is connected to the low-pressure region L through one communication hole61. Thus, the pressure inside the first space portion201can be reduced to a low pressure under a uniform pressure state.

(6) According to a sixth aspect, a shaft sealing device10C is the shaft sealing device10C according to any one of (1) to (4), in which the communication portion60C has a communication groove63formed to pass therethrough the convex portion50in the radial direction Dr and allow the first space portion201and the second space portion202to communicate with each other.

Accordingly, the pressure inside the first space portion201can be made equivalent to that of the low-pressure region L. Furthermore, the communication groove63is formed as a groove recessed from the convex portion50, so that processing becomes easier than forming a through-hole that passes through the housing30A. Therefore, the communication portion60C can be formed more simply.

(7) According to a seventh aspect, a shaft sealing device10C is the shaft sealing device10C of (6), in which a plurality of communication grooves63are formed while being spaced apart from each other in the circumferential direction Dc.

As described above, the second space portion202is connected to the low-pressure region L through the plurality of communication grooves63, so that it is possible to suppress variation in pressure inside the first space portion201as compared with a case in which the second space portion202is connected to the low-pressure region L through one communication groove63. Thus, the pressure inside the first space portion201can be reduced to a low pressure under a uniform pressure state.

(8) According to an eighth aspect, shaft sealing devices10D and10E are the shaft sealing devices10D and10E according to any one of (1) to (7), in which the shaft sealing devices10D and10E further include: outer peripheral convex portions70and71which are disposed on the outer side Dro in the radial direction Dr with respect to the convex portion50and protrude from any one of the facing surface32gand the sealing body low-pressure-side side surface22gto the other in the axial direction Da.

Accordingly, the posture of the sealing body20is maintained in the accommodating groove31not only by the convex portion50but also by the outer peripheral convex portions70and71disposed on the outer side Dro in the radial direction Dr with respect to the convex portion50. Since the posture is maintained at two positions, the convex portion50and the outer peripheral convex portions70and71separated from each other in the radial direction Dr, the posture of the sealing body20can be maintained in a more stable posture in the accommodating groove31.

(9) According to a ninth aspect, shaft sealing devices10A to10F are the shaft sealing devices10A to10F according to any one of (1) to (8), in which the sealing body20has a main body portion22, and a head portion23protrudes from the main body portion22to both sides in the axial direction Da on the outer side in the radial direction Dr than the sealing body low-pressure-side side surface22g, the accommodating groove31has a main body accommodating portion32in which the main body portion22is accommodated, and a head accommodating portion33which is formed on the outer side Dro in the radial direction Dr with respect to the main body accommodating portion32to accommodate the head portion23therein, and the head accommodating portion33has an outer peripheral contact surface33hthat faces the outer side Dro in the radial direction Dr and allows the head portion23to come into contact from the outer side Dro in the radial direction Dr.

Accordingly, the head portion23of the sealing body20comes into contact with the outer peripheral contact surface33hfrom the outer side Dro in the radial direction Dr of the head accommodating portion33. The posture of the sealing body20in the accommodating groove31is maintained not only by the convex portion50but also by the head portion23. Therefore, the sealing body20is tilted in the accommodating groove31, thereby suppressing the formation of a gap which connects the high-pressure region H to the first space portion201through the inside of the accommodating groove31. Furthermore, the head portion23comes into contact with the outer peripheral contact surface33hof the head accommodating portion33, so that it is possible to suppress the flow of the high-pressure working fluid from the high-pressure region H into the first space portion201that has passed through the head accommodating portion33. Accordingly, it is possible to stably suppress the working fluid from flowing from the high-pressure region H to the first space portion201while going around the sealing body20from the head accommodating portion33in the accommodating groove31.

(10) According to a tenth aspect, a shaft sealing device10F is the shaft sealing device10F according to any one of (1) to (9), in which the shaft sealing device10F further includes an biasing member80which is disposed inside the accommodating groove31to bias the sealing body20to the inner side Dri in the radial direction Dr with respect to the housing30F.

Accordingly, the sealing body20is in a state of being pushed toward the inner side Dri in the radial direction Dr while facing the outer peripheral surface5fof the rotor5. As a result, it is possible to suppress excessive movement of the sealing body20to the outer side Dro in the radial direction Dr due to the first flow F1of the working fluid flowing from the high-pressure region H toward the first space portion201. Therefore, it is possible to stably maintain a state in which the inner peripheral end portion20sof the sealing body20appropriately comes into slidable contact with the outer peripheral surface5fof the rotor5and exhibits good sealing performance.

(11) According to an eleventh aspect, a shaft sealing device10D is the shaft sealing device10D according to any one of (1) to (10), in which at least one of the housing30D and the sealing body20is formed of a plurality of divided bodies11in the circumferential direction Dc, and the shaft sealing device10D further includes a seam convex portion90which is formed on at least one of the facing surface32gand the sealing body low-pressure-side side surface22gin a region overlapping with a seam of adjacent divided bodies11in the circumferential direction Dc when viewed from the axial direction Da, protrudes from any one of the facing surface32gand the sealing body low-pressure-side side surface22gtoward the other in the axial direction Da, and extends in the radial direction Dr along the seam.

Accordingly, in each of the divided bodies11adjacent to each other in the circumferential direction Dc, the first space portion201is in a state of not being connected to (a state of not communicating with) a part of the seam J of the divided bodies11. Thus, it is possible to suppress the working fluid in the first space portion201from leaking from the seam J to the outside of the housing30D. As a result, it is possible to suppress the pressure state in the first space portion201from being changed by the seam J of the divided body11.

(12) According to a twelfth aspect, a rotary machine1includes the shaft sealing devices10A to10F according to any one of (1) to (11).

Examples of the rotary machine include a large-scale fluid machine such as a gas turbine, a steam turbine, a compressor, a water wheel, a chiller, and a pump.

Accordingly, by providing the shaft sealing devices10A to10F as described above, it is possible to provide the rotary machine1capable of reducing costs while suppressing wear of the sealing body20.

INDUSTRIAL APPLICABILITY

According to the shaft sealing device and the rotary machine of the present disclosure, it is possible to reduce costs while suppressing wear of the sealing body.

REFERENCE SIGNS LIST

1: Rotary machine2: Compressor3: Combustor4: Turbine5: Rotor5f: Outer peripheral surface6a,6b: Stator vane7a,7b: Rotating blade8,9: Casing10A,10B,10C,10D,10E,10F: Shaft sealing device11,11A,11B: Divided body20: Sealing body20s: Inner peripheral end portion20t: Outer peripheral end portion21: Thin plate22: Main body portion22f: Sealing body high-pressure-side side surface22g: Sealing body low-pressure-side side surface23: Head portion24A: First concave portion24B: Second concave portion30A,30B,30C,30D,30E,30F: Housing30f: Inner peripheral surface30h: Insertion hole31: Accommodating groove32: Main body accommodating portion32a: End portion (on high-pressure-side facing surface)32f: High-pressure-side facing surface32g: Low-pressure-side facing surface (facing surface)32s: End portion (on low-pressure-side facing surface)33: Head accommodating portion33h: Outer peripheral contact surface38: Shim40: Side plate40a: End portion (on side plate)41: Engaging convex portion50: Convex portion60A,60B,60C: Communication portion61,62: Communication hole63: Communication groove70: Outer peripheral convex portion70a: First surface70b: Second surface71: Outer peripheral convex portion80: Biasing member81: Biasing member body82: Fixing member90,90A,90B: Seam convex portion95: R portion100: Annular space201: First space portion202: Second space portionDa: Axial directionDa1: First sideDa2: Second sideDc: Circumferential directionDr: Radial directionDri: Inner sideDro: Outer sideH: High-pressure regionL: Low-pressure regionJ: SeamO: Central axisS1: DimensionS2: DimensionS3: DimensionS4: DimensionW1: Width dimensionW2: Width dimension