JP6474662B2 - Steam valve device - Google Patents

Description

  The present disclosure relates to a steam valve device.

  As a device for adjusting the amount of steam supplied to a steam turbine, a valve body configured to be able to contact and separate from a valve port, a valve lifting rod for lifting the valve body, and a valve housing for housing the valve body Are known. In this steam valve device, a steam channel through which high-temperature steam flows is formed inside the valve housing, and a valve port is formed facing the steam channel. The amount of steam passing through the valve port is adjusted by moving the valve lifting rod by the actuator and changing the flow path area between the valve element and the valve seat surface.

  In such a steam valve device, various problems may occur due to the thermal expansion of the valve housing due to the high-temperature steam around 500 ° C. flowing in the valve housing. For example, in Patent Document 1, when the steam turbine is started, the valve body is suddenly overheated, and a rapid temperature gradient is generated from the inner wall to the outer wall of the valve body. In order to solve this problem, an invention in which the inner wall of the valve body is covered with a heat shield is disclosed.

Japanese Patent Laid-Open No. 58-124209

  By the way, the steam valve device is configured to include a valve housing having an opening on one side, a valve lid fastened to the valve housing so as to close the opening, and a valve lifting rod inserted into the insertion hole of the valve lid. It is possible to do. By configuring in this way, it is possible to maintain the valve body and the like housed inside the valve housing simply by removing the valve lid, so that a steam valve device with excellent maintainability can be obtained.

  However, according to the knowledge of the present inventors, in such a steam valve device, there is a temperature difference between the inner surface of the valve lid facing the steam flow path through which high-temperature steam flows and the outer surface of the valve lid facing the outside air. And high thermal stress is generated in the valve lid. As a result, the valve lid is deformed, and the valve lid side insertion hole formed in the valve lid and the valve lifting rod may come into contact with each other. When the valve lid side insertion hole and the valve lifting rod come into contact with each other, the valve lifting rod is worn, so that it is necessary to frequently replace the valve lifting rod. In particular, when the deformation of the valve lid is large, the valve lifting rod is inclined and the contact between the valve body and the valve seat becomes insufficient, which may cause steam leakage.

  At least one embodiment of the present invention is based on the above-mentioned state of the art, and its object is to provide a valve housing having an opening on one side and a valve so as to close the opening. In a steam valve device including a valve lid fastened to a housing and a valve lifting rod inserted into an insertion hole of the valve lid, thermal deformation of the valve lid is reduced by reducing a temperature difference between the inner surface and the outer surface of the valve lid. Another object is to provide a steam valve device that can be reduced and has a simple structure and excellent assemblability.

  (1) A steam valve device according to at least one embodiment of the present invention is a steam valve device for adjusting the amount of steam supplied to a steam turbine, and lifts the valve body and the valve body to one side. The valve lift rod and the valve housing for accommodating the valve body, the steam flow path through which the steam flows are formed inside, the valve housing having an opening on one side, and the valve so as to close the opening A valve lid that is fastened to a housing and has a valve lid side insertion hole through which a valve lifting rod is inserted, and a heat shield provided on the inner surface side of the valve lid, and faces a steam flow path A heat shield, a fixing part sandwiched between the valve lid and the valve housing, and a heat shield having a heat shield plate insertion hole through which the valve lifting rod is inserted are configured.

  According to the embodiment described in (1) above, a valve housing having an opening on one side, a valve lid fastened to the valve housing so as to close the opening, and a valve lid insertion hole (valve cover side insertion) In a steam valve device including a valve lifting rod inserted into a hole), a heat shield plate is provided on the inner surface side of the valve lid. By suppressing the temperature rise of the inner surface of the valve lid by the heat shield plate, the temperature difference between the inner surface and the outer surface of the valve lid is reduced, and the thermal stress generated in the valve lid is reduced. Moreover, the allowable stress of a valve cover increases because the temperature rise of the inner surface of a valve cover is suppressed. As a result, thermal deformation of the valve lid can be reduced.

  Further, according to the embodiment described in the above (1), the heat shield plate is inserted into the heat shield part facing the steam flow path, the fixing part sandwiched between the valve lid and the valve housing, and the valve lifting rod. It has a heat shield plate side insertion hole. Therefore, with a simple structure in which the fixed part of the heat shield plate is sandwiched between the valve lid and the valve housing with the valve lifting rod inserted into the heat shield plate side insertion hole of the heat shield plate, It can be attached to the inner surface of the valve lid, and is easy to assemble.

  (2) In some embodiments, in the steam valve device according to (1) above, a heat shield in which a bolt for fastening the valve housing and the valve lid is inserted into the fixing portion of the heat shield plate. A plate side bolt hole is formed. The heat shield plate is configured to be fixed to the inner surface side of the valve lid by fastening the valve housing and the valve lid in a state where the bolt is inserted into the bolt hole in the heat shield plate. Yes.

  According to the embodiment described in (2) above, the heat shield plate-side bolt hole through which the bolt for fastening the valve housing and the valve lid is inserted is formed in the fixing portion of the heat shield plate. Therefore, with a simple structure that only fastens the valve housing and valve lid with the bolt inserted through the bolt hole on the heat shield plate side, the heat shield plate can be attached to the inner surface side of the valve lid and assembled. Excellent in properties.

  (3) In some embodiments, in the steam valve device according to the above (1), the valve housing has a step portion formed at a peripheral edge portion of the opening. The step portion is formed on the inner peripheral side of the housing side bolt hole through which a bolt for fastening the valve housing and the valve lid is inserted. The heat shield plate is configured to be fixed to the inner surface side of the valve lid by fastening the valve housing and the valve lid with the fixing portion of the heat shield plate placed on the stepped portion. Has been.

  According to the embodiment described in (3) above, the valve housing is a step formed on the peripheral edge of the opening, and the housing side bolt through which the bolt for fastening the valve housing and the valve lid is inserted. A step portion is formed on the inner peripheral side of the hole. Therefore, in a state where the fixing portion of the heat shield plate is placed on the stepped portion, the heat shield plate can be attached to the inner surface side of the valve lid with a simple structure that only fastens the valve housing and the valve lid. Excellent assemblability.

  (4) In some embodiments, in the steam valve device according to any one of (1) to (3), the heat shield plate has a heat shield portion that is separated from the inner surface of the valve lid rather than the fixed portion. It further has a bent portion that bends.

  According to the embodiment described in (4) above, the heat shield plate further includes a bent portion that bends so that the heat shield portion is separated from the inner surface of the valve lid rather than the fixed portion. Therefore, a space is formed between the inner surface of the valve lid and the heat shield, and this space functions as a heat insulating space. For this reason, the temperature rise on the inner surface of the valve lid is further suppressed, and the temperature difference between the inner surface and the outer surface of the valve lid is further reduced. Thereby, the thermal deformation of the valve lid can be further reduced.

  (5) In some embodiments, in the steam valve device according to any one of the above (1) to (4), the valve lid is an extension of a valve lifting rod at a peripheral portion of the valve lid side insertion hole. It has a cylindrical protrusion that protrudes from the inner surface of the valve lid along the direction. And the said heat shield plate side penetration hole is comprised so that a protrusion part may be penetrated.

  According to the embodiment described in the above (5), the exposed length of the lift rod exposed to high-temperature steam in the steam flow path is shortened by inserting the lift rod through the cylindrical protrusion. I can do it. Thereby, the risk that a malfunction occurs due to the thermal elongation of the valve lifting rod can be reduced. Moreover, even if such a protrusion is formed on the inner surface of the valve lid, the heat shield plate can be attached to the inner surface side of the valve lid.

  (6) In some embodiments, in the steam valve device according to (5), the heat shield plate side insertion hole has a gap corresponding to a thermal expansion amount of the heat shield plate when the steam turbine is driven. In the cold state, it is configured to have between the outer peripheral surface of the protruding portion.

  According to the embodiment described in (6) above, when the steam turbine is driven, even if the heat shield flows through the steam passage and the heat shield is thermally stretched, the heat shield is a protruding portion. It is possible to prevent the heat shield plate from being deformed by coming into contact with the outer peripheral surface.

  (7) In some embodiments, in the steam valve device according to the above (5) or (6), the heat shield plate further includes a cylindrical sleeve portion extending along the outer peripheral surface of the protruding portion. Have.

  According to the embodiment described in (7) above, the heat shield plate has the cylindrical sleeve portion extending along the outer peripheral surface of the protruding portion. For this reason, it is difficult for high-temperature steam flowing through the steam flow path to enter between the inner surface of the valve lid and the heat shield plate, and temperature rise on the inner surface of the valve lid can be further suppressed.

  (8) In some embodiments, in the steam valve device according to any one of (1) to (7), the heat shield plate includes a plurality of heat shield plate elements obtained by dividing the heat shield plate. The plurality of heat shield plate elements include at least a first heat shield plate element and a second heat shield plate element disposed adjacent to the first heat shield plate element. The first heat shield plate element has a first fixing portion corresponding to the fixing portion of the heat shield plate, and the second heat shield plate element is a second fixing portion corresponding to the fixing portion of the heat shield plate. Have And the dividing line which divides | segments the said 1st heat shield plate element and the 2nd heat shield plate element is comprised so that a heat shield plate side penetration hole may pass.

  According to the embodiment described in (8) above, by dividing the heat shield plate into a plurality of heat shield plate elements, even a large heat shield plate can be easily attached to the inner surface side of the valve lid. . In addition, with a simple structure in which each of the first fixing portion of the first heat shield element and the second fixing portion of the second heat shield element is sandwiched between the valve lid and the valve housing, A heat shield can be attached to the inner surface of the valve lid, making it easy to assemble. Moreover, the dividing line which divides | segments a 1st heat shield plate element and a 2nd heat shield plate element is comprised so that a heat shield plate side penetration hole may pass. For this reason, for example, the first heat shield plate element and the second heat shield plate element can be attached to the inner surface side of the valve lid even when the valve lifting rod is inserted into the valve lid side insertion hole. Also, the heat shield plate element is excellent in mountability.

  (9) In some embodiments, in the steam valve device according to (8) above, the heat shield plate is formed of a long member having a longitudinal direction. And the said parting line is comprised so that it may extend along the direction orthogonal to the longitudinal direction of a heat shield.

  According to the embodiment described in (9) above, when the heat shield plate is divided into a plurality of heat shield plate elements, the heat shield plate is divided along a direction orthogonal to the longitudinal direction of the heat shield plate. For this reason, since each heat shield plate element does not become too long, it is excellent in the mountability at the time of attaching each heat shield plate element to the inner surface side of a valve lid.

  (10) In some embodiments, in the steam valve device according to (2) above, the heat shield plate includes a plurality of heat shield plate elements obtained by dividing the heat shield plate. The plurality of heat shield plate elements include at least a first heat shield plate element and a second heat shield plate element disposed adjacent to the first heat shield plate element. The first heat shield plate element has a first fixing portion corresponding to the fixing portion of the heat shield plate, and the second heat shield plate element is a second fixing portion corresponding to the fixing portion of the heat shield plate. Have The dividing line dividing the first heat shield plate element and the second heat shield plate element is configured to pass through the heat shield plate side insertion hole and not through the heat shield plate side bolt hole. The

  According to the embodiment described in (10) above, similarly to the embodiment described in (8) above, the heat shield plate is divided into a plurality of heat shield plate elements, thereby providing a large heat shield plate. Can be easily attached to the inner surface of the valve lid. In addition, with a simple structure in which each of the first fixing portion of the first heat shield element and the second fixing portion of the second heat shield element is sandwiched between the valve lid and the valve housing, A heat shield can be attached to the inner surface of the valve lid, making it easy to assemble. Moreover, the dividing line which divides | segments a 1st heat shield plate element and a 2nd heat shield plate element is comprised so that a heat shield plate side penetration hole may pass. For this reason, for example, the first heat shield plate element and the second heat shield plate element can be attached to the inner surface side of the valve lid even when the valve lifting rod is inserted into the valve lid side insertion hole. Also, the heat shield plate element is excellent in mountability.

  Moreover, according to embodiment described in said (10), it is comprised so that the dividing line which divides the 1st heat shield plate element and the 2nd heat shield plate element may not pass a heat shield plate side bolt hole. Is done. For this reason, compared with the case where a parting line passes a heat shield board side bolt hole, the accuracy of alignment with the 1st heat shield board element and the 2nd heat shield board element can be loosened, and heat shield Excellent plate element mounting.

  (11) In some embodiments, in the steam valve device according to any one of (8) to (10), the heat shield plate is a first heat shield plate element when the steam turbine is driven. The gap corresponding to the sum of the first gap amount corresponding to the thermal elongation amount of the second heat gap and the second gap amount corresponding to the thermal elongation amount of the second heat shield plate element is defined as the first heat shield in the cold state. It is comprised so that it may have between a board | plate element and a 2nd heat shield board element.

  According to the embodiment described in (11) above, even when the steam turbine is driven, even when a high-temperature channel flows through the steam channel and the heat shield plate thermally expands, the steam turbine is disposed adjacently. It is possible to prevent the heat shield plates from deforming due to contact between the heat shield plates.

  According to at least one embodiment of the present invention, a valve housing having an opening on one side, a valve lid fastened to the valve housing so as to close the opening, and a valve lifting rod inserted into the insertion hole of the valve lid A steam valve device having a simple structure and excellent ease of assembly while reducing thermal deformation of the valve lid by reducing the temperature difference between the inner surface and the outer surface of the valve lid. I can do it.

It is sectional drawing of the steam valve apparatus concerning one Embodiment of this invention. It is sectional drawing of the steam valve apparatus concerning one Embodiment of this invention. It is sectional drawing of the steam valve apparatus concerning one Embodiment of this invention. It is sectional drawing of the steam valve apparatus concerning one Embodiment of this invention. It is the figure which showed the heat shield of the steam valve apparatus shown in FIG. It is the figure which showed the heat shield of the steam valve apparatus shown in FIG. It is the figure which showed the heat shield of the steam valve apparatus shown in FIG. It is the figure which showed the heat shield of the steam valve apparatus shown in FIG. It is the figure which expanded the dividing line periphery of the heat shield board element concerning one Embodiment of this invention. It is a figure for demonstrating the effect of the steam valve apparatus concerning one Embodiment of this invention. It is a figure for demonstrating the effect of the steam valve apparatus concerning one Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
In the following description, the same components may be denoted by the same reference numerals and detailed description thereof may be omitted. Moreover, in the figure which shows a comparison form, "'" may be attached | subjected to the code | symbol of the structure of corresponding embodiment, and the detailed description may be abbreviate | omitted.

1 to 4 are cross-sectional views of a steam valve device according to an embodiment of the present invention. 5-8 is the figure which showed the heat shield of the steam valve apparatus concerning one Embodiment of this invention.
A steam valve device 10 (10A, 10B, 10C, 10D) according to an embodiment of the present invention is a steam valve device for adjusting the amount of steam supplied to a steam turbine (not shown). As shown in FIGS. 1-4, the steam valve apparatus 10 (10A, 10B, 10C, 10D) concerning one Embodiment of this invention is the valve body 2, the valve lifting rod 4, the valve housing 6, and valve | bulb. A lid 8 and a heat shield plate 9 are provided.

  In the illustrated exemplary embodiment, the valve body 2 includes a valve body 21 configured to be in contact with and away from the valve seat surface 31 of the valve port 3, and a valve connected to the valve body 21 at one end side. A shaft portion 22 and a valve head portion 23 provided on the other end side of the valve shaft portion 22 are provided. The valve shaft portion 22 is inserted into a valve shaft hole 51 formed in the valve lifting plate 5, the valve main body portion 21 is located below the valve shaft hole 51, and above the valve shaft hole 51. The valve head 23 is located. The valve body 21 and the valve head 23 have an outer shape larger than the hole cross section of the valve shaft hole 51.

  The valve lifting rod 4 is for lifting the valve body 2 upward.

  In the illustrated exemplary embodiment, the valve lifting rod 4 is connected to the valve lifting plate 5 inside the valve housing 6 and connected to the actuator 11 outside the valve housing 6. Then, when the valve lifting rod 4 is lifted upward by the driving force of the actuator 11, the upper surface 5a of the valve lifting plate 5 and the lower surface 23a of the valve head 23 come into contact with each other, and the valve body 21 is moved upward (valve seat surface). (In a direction away from 31). Note that the gap s1 between the upper surface 5a of the valve lifting plate 5 and the lower surface 23a of the valve head 23 in a state where the valve body 21 is in contact with the valve seat surface 31 is different for each of the plurality of valve bodies 2. Thus, the valve opening timing and the opening area of each valve body 2 are set to be different from each other.

  The valve housing 6 is a housing member for housing the valve body 2. A steam flow path 7 through which steam flows is formed inside the valve housing 6. The valve housing 6 has an opening 6A on one side.

  In the illustrated exemplary embodiment, the valve housing 6 is formed in a box shape having an opening 6A on the upper side, and is arranged in series along the axial direction (longitudinal direction) of the valve housing 6. The valve body 2 is accommodated. Further, a steam introduction pipe 61 is provided on one end side in the axial direction of the valve housing 6, and four valve ports 3 are formed at the bottom of the valve housing 6 corresponding to the four valve bodies 2. Yes. As indicated by the arrows in the figure, the steam introduced from the steam introduction pipe 61 into the valve housing 6 flows through the steam flow path 7 and passes between the valve body 21 and the valve seat surface 31. And it supplies to the steam turbine not shown arrange | positioned under the steam valve apparatus 10 via the valve port 3. As shown in FIG.

  The valve lid 8 is a lid member fastened to the valve housing 6 so as to close the opening 6A formed on one side of the valve housing 6 described above. Further, the valve lid 8 is formed with a valve lid side insertion hole 81 through which the above-described valve lifting rod 4 is inserted.

  In the illustrated exemplary embodiment, a valve lid side bolt hole 82 is formed in the peripheral portion of the valve lid 8. A housing-side bolt hole 62 is also formed in the peripheral portion of the valve housing 6 at a position corresponding to the valve lid-side bolt hole 82. Then, a bolt 83 is inserted into the valve lid side bolt hole 82 and the housing side bolt hole 62, and the bolt 83 is tightened, whereby the valve lid 8 is connected to the valve housing 6. A cylindrical bush 84 is inserted into the valve lid side insertion hole 81, and the valve lifting rod 4 is inserted through the bush 84.

  The heat shield plate 9 is a plate-like member provided on the inner surface 8 a side of the valve lid 8. As shown in FIGS. 5 to 11, the heat shield plate 9 includes a heat shield portion 91 facing the steam flow path 7, a fixing portion 92 sandwiched between the valve lid 8 and the valve housing 6, and the valve lifting rod 4. Has a heat shield plate side insertion hole 93 through which is inserted.

  According to one embodiment of the present invention configured as described above, the valve housing 6 having an opening on one side, the valve lid 8 fastened to the valve housing 6 so as to close the opening 6A, and the valve lid 8 In the steam valve device 1 including the valve lifting rod 4 inserted through the valve lid side insertion hole 81, the above-described heat shield plate 9 is provided on the inner surface 8 a side of the valve lid 8. By suppressing the temperature rise of the inner surface 8a of the valve lid 8 by the heat shield plate 9, the temperature difference between the inner surface 8a and the outer surface 8b of the valve lid 8 is reduced, and thermal deformation of the valve lid 8 is suppressed. .

  FIG. 10 is a diagram for explaining the effect of the steam valve device according to the embodiment of the present invention. In FIG. 10, the horizontal axis indicates the elapsed time from the start of driving of the steam turbine, and the vertical axis indicates the temperature. 10A shows the temperature change of the valve lid in the steam control valve device of the comparative form, and FIG. 10B shows the temperature change of the valve lid in the steam control valve device of the present embodiment. Is shown. Here, G1 (G1 ′) is a temperature change on the inner surface of the valve lid, G2 (G2 ′) is a temperature change on the outer surface of the valve lid, and G3 (G3 ′) is a temperature difference between the inner surface and the outer surface of the valve lid. Each change is shown. Moreover, FIG. 11 is a figure for demonstrating the effect of the steam valve apparatus concerning one Embodiment of this invention. In FIG. 11, the horizontal axis indicates the temperature, and the vertical axis indicates the stress generated in the valve lid.

  As shown in FIG. 10, the temperature difference between the inner surface 8a and the outer surface 8b of the valve lid 8 is smaller in this embodiment than in the comparative embodiment. Accordingly, as shown in FIG. 11, the thermal stress generated by the temperature difference between the inner and outer surfaces of the valve lid 8 is also smaller in the present embodiment than in the comparative embodiment. Moreover, as shown in FIG. 11, the allowable stress of the material (for example, chromium molybdenum steel) constituting the valve lid 8 is higher when the temperature of the material is lower. Therefore, since the temperature rise of the inner surface 8a of the valve lid 8 is suppressed, the allowable stress itself of the valve lid 8 is higher in the present embodiment than in the comparative embodiment. Accordingly, the present embodiment is positioned farther from the plastic deformation occurrence region than the comparative embodiment. That is, the thermal deformation of the valve lid 8 is suppressed.

  Further, according to the embodiment of the present invention configured as described above, the heat shield plate 9 is fixed between the heat shield portion 91 facing the steam flow path 7, the valve lid 8 and the valve housing 6. The heat shield plate side insertion hole 93 into which the part 92 and the valve lifting rod 4 are inserted is provided. Accordingly, the fixing portion 92 of the heat shield plate 9 is simply sandwiched between the valve lid 8 and the valve housing 6 in a state where the valve lifting rod 4 is inserted into the heat shield plate side insertion hole 93 of the heat shield plate 9. With the structure, the heat shield 9 can be attached to the inner surface 8a side of the valve lid 8, and the assembly is excellent.

  In some embodiments, in the steam valve device 10 (10A, 10C, 10D) shown in FIGS. 1, 3, and 4, as shown in FIG. 5, FIG. 7, and FIG. 9C, 9D) is formed with a heat shield plate side bolt hole 94 through which a bolt 83 for fastening the valve housing 6 and the valve lid 8 is inserted. The heat shield plate 9 (9A, 9C, 9D) is configured such that the valve housing 6 and the valve lid 8 are fastened with the bolt 83 inserted into the heat shield plate side bolt hole 94, whereby the valve lid 8 It is comprised so that it may fix to the inner surface 8a side.

  In the illustrated exemplary embodiment, a plurality of heat shield plate side bolt holes 94 are formed at intervals in the circumferential direction at the outer peripheral edge of the heat shield plate 9 (9A, 9C, 9D). The hole diameter of the heat shield plate side bolt hole 94 is such that a gap corresponding to the amount of thermal expansion of the heat shield plate 9 (9A, 9C, 9D) when the steam turbine is driven is It is comprised so that it may have between surfaces. Here, the cold state means a state in which the steam turbine is not driven and high-temperature steam is not flowing in the steam flow path 7 of the steam valve device 10 (10A, 10B, 10C, 10D). . The temperatures of the valve housing 6 and the valve lid 8 during the cold state are substantially the same as the room temperature in the plant in which the steam valve devices 10 (10A, 10B, 10C, 10D) are arranged.

  According to such an embodiment, the heat shield 9 (9A) has a simple structure in which the valve housing 6 and the valve lid 8 are simply fastened with the bolt 83 inserted through the heat shield plate-side bolt hole 94. , 9C, 9D) can be attached to the inner surface 8a side of the valve lid 8, and the assembly is excellent.

  In some embodiments, in the steam valve device 10 (10B) shown in FIG. 2, the valve housing 6 has a stepped portion 63 formed at the peripheral edge of the opening 6A. The step portion 63 is formed on the inner peripheral side of the housing side bolt hole 62 through which the bolt 83 for fastening the valve housing 6 and the valve lid 8 is inserted. Then, as shown in FIG. 6, the heat shield 9 (9B) has the valve housing 6 and the valve lid 8 in a state where the fixing portion 92m of the heat shield 9 (9B) is placed on the step portion 63. By being fastened, it is configured to be fixed to the inner surface 8 a side of the valve lid 8.

  In the illustrated exemplary embodiment, the step 63 is a portion that is lower than the top surface 64 of the valve housing 6 by a height h. The height h of the stepped portion 63 is substantially the same as the thickness of the heat shield plate 9 (9B). Further, a gap between the heat shield plate 9 (9B) and the peripheral surface 63a of the step portion 63 corresponds to the amount of thermal expansion of the heat shield plate 9 (9B) when the steam turbine is driven in the cold state. Is formed.

  According to such an embodiment, in a state where the fixing portion 92m of the heat shield 9 (9B) is placed on the stepped portion 63, the valve housing 6 and the valve lid 8 are simply fastened. The heat shield 9 (9B) can be attached to the inner surface 8a side of the valve lid 8, and the assembly is excellent.

  In some embodiments, in the steam valve device 10 (10C, 10D) shown in FIGS. 3 and 4, as shown in FIGS. 7 and 8, the heat shield plate 9 (9C, 9D) is a heat shield part. 91 further includes a bent portion 95 that bends away from the inner surface 8 a of the valve lid 8 rather than the fixed portion 92.

  In the illustrated exemplary embodiment, the curved portion 95 is formed at the outer peripheral edge portion of the heat shield portion 91, that is, at a position between the heat shield portion 91 and the fixing portion 92. The curved portion 95 is composed of two bent portions that are bent in opposite directions. In the exemplary embodiment (not shown), the curved portion 95 is formed at a position on the inner peripheral side with respect to the outer peripheral edge portion of the heat shield portion 91. In the exemplary embodiment (not shown), the curved portion 95 is composed of two curved portions that are bent in opposite directions.

  According to such an embodiment, a space 97 is formed between the inner surface 8a of the valve lid 8 and the heat shield 91, and this space 97 functions as a heat insulating space. For this reason, the temperature rise in the inner surface 8a of the valve lid 8 is further suppressed, and the temperature difference between the inner surface 8a and the outer surface 8b of the valve lid 8 is further reduced. Thereby, the thermal deformation of the valve lid 8 can be further reduced.

  In some embodiments, in the steam valve device 10 (10 </ b> A, 10 </ b> B, 10 </ b> C, 10 </ b> D) shown in FIGS. 1 to 4, the valve lid 8 is located at the peripheral edge of the valve lid side insertion hole 81. It has the cylindrical protrusion part 85 which protrudes from the inner surface 8a of the valve lid 8 along the extending direction. The heat shield plate side insertion hole 93 is configured such that the protruding portion 85 is inserted therethrough.

  According to such an embodiment, the exposed length of the valve lifting rod 4 exposed to high-temperature steam in the steam flow path 7 is shortened by inserting the valve lifting rod 4 through the cylindrical projecting portion 85. I can do it. Thereby, the risk that a malfunction occurs due to the thermal elongation of the valve lifting rod 4 can be reduced. Even if such a protrusion 85 is formed on the inner surface 8 a of the valve lid 8, the heat shield plate 9 can be attached to the inner surface 8 a side of the valve lid 8.

  In some embodiments, in the steam valve device 10 (10A, 10B, 10C, 10D) shown in FIGS. 1 to 4, the heat shield plate side insertion hole 93 is provided with the heat shield plate 9 when the steam turbine is driven. It is configured to have a gap s2 corresponding to the thermal elongation amount between the outer peripheral surface 85a of the protruding portion 85 in the cold state.

  According to such an embodiment, when the steam turbine is driven, even when a high-temperature channel flows through the steam channel 7 and the heat-shielding plate 9 is thermally expanded, the heat-shielding plate 9 is protruded 85. It is possible to prevent the heat shield plate 9 from being deformed in contact with the outer peripheral surface 85a.

  In some embodiments, in the steam valve device 10 (10 </ b> D) shown in FIG. 4, as shown in FIG. 8, the heat shield plate 9 has a cylindrical shape that extends along the outer peripheral surface 85 a of the protrusion 85. A sleeve portion 96 is further provided.

  In the illustrated exemplary embodiment, the distal end portion 96 a of the sleeve portion 96 extends to the same height as the distal end surface 85 b of the protruding portion 85.

  According to such an embodiment, it becomes difficult for high-temperature steam flowing through the steam flow path 7 to enter between the inner surface 8a of the valve lid 8 and the heat shield plate 9, and the temperature rise on the inner surface 8a of the valve lid 8 is prevented. It can be further suppressed.

  In some embodiments, in the steam valve device 10 (10D) shown in FIG. 4, the sleeve portion 96 has a gap s3 between the distal end portion 96a of the sleeve portion 96 and the outer peripheral surface 85a in the cold state. More than the clearance s2 between the base end portion 96b of the portion 96 and the outer peripheral surface 85a during cooling (that is, the clearance s2 between the heat shield plate side insertion hole 93 and the outer peripheral surface 85a described above during cooling). small.

  In the sleeve portion 96, the distal end portion 96a is more easily deformed than the proximal end portion 96b. Therefore, the distal end portion 96a is in contact with the outer peripheral surface 85a rather than the proximal end portion 96b is in contact with the outer peripheral surface 85a. The influence on the entire heat shield 9 is small. Therefore, according to such an embodiment, when the steam turbine is driven, the front end portion 96a of the sleeve portion 96 is brought into contact with the outer peripheral surface 85a, thereby avoiding the risk of deformation of the entire heat shield plate 9 and avoiding the risk of steam flow. It is possible to reliably prevent high-temperature steam flowing through the passage 7 from entering between the inner surface 8a of the valve lid 8 and the heat shield plate 9. Thereby, the temperature rise in the inner surface 8a of the valve lid 8 can be further suppressed.

  In some embodiments, in the steam valve device 10 (10A, 10B, 10C, 10D) shown in FIGS. 1-4, as shown in FIGS. 5-8, the heat shield 9 (9A, 9B, 9C, 9D) includes a plurality of heat shield plate elements obtained by dividing the heat shield plate 9. The plurality of heat shield elements are at least a first heat shield element 191 (191A, 191B, 191C, 191D) and a second heat shield element disposed adjacent to the first heat shield element 191. 192 (192A, 192B, 192C, 192D). The first heat shield plate element 191 includes first fixing portions 921 and 921m corresponding to the fixing portions 92 and 92m of the heat shield plate 9, and the second heat shield plate element 192 includes the heat shield plate 9 Second fixing portions 922 and 922m corresponding to the fixing portions 92 and 92m are provided. The dividing line Ld that divides the first heat shield plate element 191 and the second heat shield plate element 192 is configured to pass through the heat shield plate side insertion hole 93.

  In the exemplary embodiment shown, the heat shield 9 (9A, 9B, 9C, 9D) is divided into three heat shield elements 191, 192, 193. Each of the three heat shield plate elements 191, 192, 193 includes a first heat shield 911, a second heat shield 912, a third heat shield 913 corresponding to the heat shield 91 described above, and , First fixing portions 921 and 921m corresponding to the fixing portion 92, second fixing portions 922 and 922m, and third fixing portions 923 and 923m. That is, the first heat shield 911, the second heat shield 912, and the third heat shield 913 constitute the heat shield 91, and the first fixing portions 921 and 921 m and the second fixing portion 922. , 922m and third fixing portions 923 and 923m constitute a fixing portion 92.

  Further, in the exemplary embodiment shown in FIGS. 7 and 8, each of the three heat shield plate elements 191, 192, 193 includes a first curved portion 951, a second curved portion 95 corresponding to the curved portion 95 described above. It further has a curved portion 952 and a third curved portion 953. That is, the first music part 951, the second music part 952, and the third music part 953 constitute the music part 95. Also, in the exemplary embodiment assisted by FIG. 8, each of the three heat shield elements 191, 192, 193 includes a first sleeve 961, a second sleeve 962, corresponding to the sleeve 96 described above, respectively. A third sleeve portion 963 is further provided. That is, the first sleeve 961, the second sleeve portion 962, and the third sleeve portion 963 constitute a sleeve portion 96.

  According to such an embodiment, by dividing the heat shield 9 into a plurality of heat shield elements, even the large heat shield 9 can be easily attached to the inner surface 8a side of the valve lid 8. . The first fixing portions 911 and 911m of the first heat shield plate element 191 and the second fixing portions 912 and 912m of the second heat shield plate element 192 are respectively connected to the valve lid 8 and the valve housing 6. The heat shield 9 (9A, 9B, 9C, 9D) can be attached to the inner surface 8a side of the valve lid 8 with a simple structure that is sandwiched between them, and the assembly is excellent. Further, since the dividing line Ld that divides the first heat shield plate element 191 and the second heat shield plate element 192 is configured to pass through the heat shield plate side insertion hole 93, for example, the valve lid side Even in a state in which the valve lifting rod 4 is inserted into the insertion hole 81, the first heat shield plate element 191 and the second heat shield plate element 192 can be attached to the inner surface 8a side of the valve lid 8, and the heat shield It also has excellent plate element mounting.

  In some embodiments, in the steam valve device 10 (10A, 10B, 10C, 10D) shown in FIGS. 1-4, as shown in FIGS. 5-8, the heat shield 9 (9A, 9B, 9C, 9D) consists of a long member having a longitudinal direction. The dividing line Ld is configured to extend along a direction orthogonal to the longitudinal direction of the heat shield plate 9.

  According to such an embodiment, when the heat shield plate 9 (9A, 9B, 9C, 9D) is divided into a plurality of heat shield plate elements, the heat shield plate 9 is divided along a direction orthogonal to the longitudinal direction of the heat shield plate 9. Is done. For this reason, since each heat shield plate element does not become too long, it is excellent in the mountability at the time of attaching each heat shield plate element to the inner surface 8a side of the valve lid 8.

  In some embodiments, in the steam valve device 10 (10A, 10C, 10D) shown in FIGS. 1, 3, and 4, the first heat shield element as shown in FIGS. A dividing line Ld that divides 191 and the second heat shield plate element 192 passes through the heat shield plate side insertion hole 93 and does not pass through the heat shield plate side bolt hole 94.

  According to such an embodiment, the dividing line Ld that divides the first heat shield plate element 191 and the second heat shield plate element 192 is configured not to pass through the heat shield plate-side bolt hole 94. . For this reason, compared with the case where the dividing line Ld passes the heat shield plate side bolt hole 94, the accuracy of alignment between the first heat shield plate element 191 and the second heat shield plate element 191 can be reduced. The heat shield element is easy to install.

FIG. 9 is an enlarged view around the parting line of the heat shield element according to the embodiment of the present invention.
In some embodiments, in the steam valve device 10 (10A, 10B, 10C, 10D) shown in FIGS. 1 to 4, as shown in FIG. 9, the heat shield plate 9 is provided when the steam turbine is driven. A gap corresponding to the sum of the first gap amount sa1 corresponding to the thermal elongation amount of the first heat shield plate element 191 and the second gap amount sa2 corresponding to the thermal extension amount of the second heat shield plate element 192. It is configured to have sa between the first heat shield element 191 and the second heat shield element 192 in the cold state.

  According to the embodiment described above, even when the steam turbine is driven, a high-temperature flow path flows through the steam flow path 7 and the heat shield plate 9 is thermally expanded, so that they are arranged adjacent to each other. The heat shield plate elements 191 and 192 can be prevented from coming into contact with each other to prevent the heat shield plate 9 from being deformed.

As mentioned above, although several embodiment of this invention was described, this invention is not limited to said form, A various change in the range which does not deviate from the objective of this invention is possible.
For example, in the embodiment described above, the valve lifting rod 4 is connected to the valve lifting plate 5, and the valve body 2 is moved upward via the valve lifting plate 5 by lifting the valve lifting rod 4 upward. It is configured to lift. However, as in another embodiment (not shown) of the present invention, the valve lifting rod 4 and the valve body 2 are directly connected, and the valve lifting rod 4 is lifted upward to directly lift the valve body 2 upward. You may comprise so that it may lift to.

2 Valve body 21 Valve body portion 22 Valve shaft portion 23 Valve head portion 23a Lower surface 3 Valve port 31 Valve seat surface 4 Valve lifting rod 5 Valve lifting plate 51 Valve shaft hole 5a Upper surface 6 Valve housing 61 Steam introduction pipe 62 Housing side bolt hole 63 Step 63a Peripheral surface 64 Top surface 6A Opening 7 Steam flow path 8 Valve cover 8a Inner surface 8b Outer surface 81 Valve cover side insertion hole 82 Valve cover side bolt hole 83 Bolt 84 Bush 85 Protruding part 85a Outer surface 9 (9A, 9B, 9C, 9D) Heat shield plate 91 Heat shield portion 92, 92m Fixing portion 93 Heat shield plate side insertion hole 94 Heat shield plate side bolt hole 95 Bent portion 96 Sleeve portion 96a Tip portion 96b Base end portion 97 Spaces 191, 192, 193 Heat shield element 10 (10A, 10B, 10C, 10D) Steam valve device 11 Actuator

Claims (9)

A steam valve device for adjusting the amount of steam supplied to a steam turbine,
The disc,
A valve lifting rod for lifting the valve body to one side;
A valve housing for housing the valve body, wherein a steam flow path through which steam flows is formed inside, and a valve housing having an opening on the one side;
A valve lid fastened to the valve housing so as to close the opening, the valve lid having a valve lid side insertion hole through which the valve lifting rod is inserted;
A heat shield provided on the inner surface side of the valve lid, the heat shield facing the steam flow path, a fixed portion sandwiched between the valve lid and the valve housing, and the valve lifting rod are inserted therethrough A heat shield plate having a heat shield plate side insertion hole, and
The valve housing is a step formed at the peripheral edge of the opening, and is formed on the inner peripheral side of a housing side bolt hole through which a bolt for fastening the valve housing and the valve lid is inserted. Have a step,
The heat shield plate is fixed to the inner surface side of the valve lid by fastening the valve lid and the valve housing in a state where the fixing portion of the heat shield plate is placed on the stepped portion. A steam valve device configured to be. A steam valve device for adjusting the amount of steam supplied to a steam turbine,
The disc,
A valve lifting rod for lifting the valve body to one side;
A valve housing for housing the valve body, wherein a steam flow path through which steam flows is formed inside, and a valve housing having an opening on the one side;
A valve lid fastened to the valve housing so as to close the opening, the valve lid having a valve lid side insertion hole through which the valve lifting rod is inserted;
A heat shield provided on the inner surface side of the valve lid, the heat shield facing the steam flow path, a fixed portion sandwiched between the valve lid and the valve housing, and the valve lifting rod are inserted therethrough A heat shield plate having a heat shield plate side insertion hole, and
The said heat shield board is a steam valve apparatus which further has the bending part which the said heat shield part bends so that it may space apart from the inner surface of the said valve lid rather than the said fixing | fixed part. A steam valve device for adjusting the amount of steam supplied to a steam turbine,
The disc,
A valve lifting rod for lifting the valve body to one side;
A valve housing for housing the valve body, wherein a steam flow path through which steam flows is formed inside, and a valve housing having an opening on the one side;
A valve lid fastened to the valve housing so as to close the opening, the valve lid having a valve lid side insertion hole through which the valve lifting rod is inserted;
A heat shield provided on the inner surface side of the valve lid, the heat shield facing the steam flow path, a fixed portion sandwiched between the valve lid and the valve housing, and the valve lifting rod are inserted therethrough A heat shield plate having a heat shield plate side insertion hole, and
The valve lid has a cylindrical projecting portion projecting from the inner surface of the valve lid along the extending direction of the valve lifting rod in the peripheral portion of the valve lid side insertion hole,
The heat shield plate side insertion hole is a steam valve device configured such that the protruding portion is inserted. The heat shield plate side insertion hole is configured to have a gap corresponding to the thermal expansion amount of the heat shield plate when the steam turbine is driven between the outer peripheral surface of the protruding portion in the cold state. Ru
The steam valve device according to claim 3 . The heat shield plate further includes a cylindrical sleeve portion extending along the outer peripheral surface of the protruding portion.
The steam valve device according to claim 3 or 4 . A steam valve device for adjusting the amount of steam supplied to a steam turbine,
The disc,
A valve lifting rod for lifting the valve body to one side;
A valve housing for housing the valve body, wherein a steam flow path through which steam flows is formed inside, and a valve housing having an opening on the one side;
A valve lid fastened to the valve housing so as to close the opening, the valve lid having a valve lid side insertion hole through which the valve lifting rod is inserted;
A heat shield provided on the inner surface side of the valve lid, the heat shield facing the steam flow path, a fixed portion sandwiched between the valve lid and the valve housing, and the valve lifting rod are inserted therethrough A heat shield plate having a heat shield plate side insertion hole, and
The heat shield plate comprises a plurality of heat shield plate elements obtained by dividing the heat shield plate,
The plurality of heat shield plate elements include at least a first heat shield plate element and a second heat shield plate element disposed adjacent to the first heat shield plate element;
The first heat shield plate element has a first fixing portion corresponding to the fixing portion of the heat shield plate, and the second heat shield plate element corresponds to the fixing portion of the heat shield plate. Having a second fixing part,
A steam valve device configured such that a dividing line dividing the first heat shield plate element and the second heat shield plate element passes through the heat shield plate side insertion hole. The heat shield plate is composed of a long member having a longitudinal direction,
The dividing line extends along a direction orthogonal to the longitudinal direction of the heat shield plate.
The steam valve device according to claim 6 . A steam valve device for adjusting the amount of steam supplied to a steam turbine,
The disc,
A valve lifting rod for lifting the valve body to one side;
A valve housing for housing the valve body, wherein a steam flow path through which steam flows is formed inside, and a valve housing having an opening on the one side;
A valve lid fastened to the valve housing so as to close the opening, the valve lid having a valve lid side insertion hole through which the valve lifting rod is inserted;
A heat shield provided on the inner surface side of the valve lid, the heat shield facing the steam flow path, a fixed portion sandwiched between the valve lid and the valve housing, and the valve lifting rod are inserted therethrough A heat shield plate having a heat shield plate side insertion hole, and
The fixing portion of the heat shield plate is formed with a heat shield plate side bolt hole through which a bolt for fastening the valve housing and the valve lid is inserted,
The heat shield plate is fixed to the inner surface side of the valve lid by fastening the valve lid and the valve housing in a state where the bolt is inserted into the bolt hole on the heat shield plate side. Configured,
The heat shield plate comprises a plurality of heat shield plate elements obtained by dividing the heat shield plate,
The plurality of heat shield plate elements include at least a first heat shield plate element and a second heat shield plate element disposed adjacent to the first heat shield plate element;
The first heat shield plate element has a first fixing portion corresponding to the fixing portion of the heat shield plate, and the second heat shield plate element corresponds to the fixing portion of the heat shield plate. Having a second fixing part,
A dividing line that divides the first heat shield plate element and the second heat shield plate element passes through the heat shield plate side insertion hole and does not pass through the heat shield plate side bolt hole. Steam valve device composed. The heat shield plate has a first gap amount corresponding to a thermal elongation amount of the first heat shield plate element and a thermal elongation amount of the second heat shield plate element when the steam turbine is driven. A gap corresponding to the total amount of the corresponding second gap is provided between the first heat shield plate element and the second heat shield plate element in the cold state.
The steam valve device according to any one of claims 6 to 8 .

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