Steam valve and steam turbine equipment equipped with a steam valve

Abstract

The steam valve includes a valve housing, a valve core, a valve stem, a driver, a thermal buffer component, a linkage mechanism, and a linkage base. The thermal buffer component has: a thermal buffer plate that is spaced away from the valve housing toward the front end side in the axial direction in which the valve stem extends; and a support column that fixes the thermal buffer plate so as not to be relatively movable with respect to the valve housing. The driver has: a driver housing; and a driver rod that extends axially within the driver housing and moves axially with respect to the driver housing. The linkage base is fixed to the thermal buffer component and extends from the thermal buffer component in a direction perpendicular to the axis perpendicular to the axial direction. The driver housing is fixed to the linkage base. The linkage mechanism is arranged on the front end side relative to the edge on the proximal end side of the linkage base.

Description

Technical Field

[0001] The present invention relates to a steam valve and a steam turbine device including the steam valve.

[0002] This application claims priority based on Japanese Patent Application No. 2020-085245 filed on May 14, 2020, and incorporates its content herein. Background Art

[0003] As a steam valve for adjusting the steam flow rate supplied to a steam turbine, for example, there is a steam valve disclosed in Patent Document 1 below. The steam valve includes: a valve housing forming a steam flow path; a valve element opening and closing the flow path; a valve stem connected to the valve element; and a driver moving the valve stem. A link mechanism for transmitting the operation of the driver to the valve stem is provided between the driver and the valve stem. The link mechanism includes a lever connecting the valve stem and the driver. The middle portion of the lever is rotatably connected to the front end portion of the valve stem. One end portion of the lever is connected to the driver rod. The valve stem extends in the moving direction of the valve element. The driver rod is parallel to the valve stem. That is, the driver rod extends in the axial direction in which the valve stem extends. When the driver rod moves to one side or the other side in the axial direction, one end portion of the lever also moves to one side in the axial direction. As a result, the middle portion of the lever and the valve stem move to one side in the axial direction.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2002-097903 Summary of the Invention

[0007] Technical Problem to be Solved by the Invention

[0008] Since the steam supplied to the steam turbine flows through the steam valve, the temperature of the valve element or the valve stem rises due to the heat of the steam. In the technology described in Patent Document 1 above, the heat of the steam is transmitted to the link mechanism via the valve stem. As a result, thermal expansion may occur in the link mechanism, leading to malfunction of the link mechanism.

[0009] Here, an object of the present invention is to provide a technology capable of suppressing malfunction due to the influence of heat.

[0010] Means for Solving the Technical Problem

[0011] In order to solve the above problems, the steam valve according to the present invention includes: a valve housing in which a steam flow path is formed inside; a valve element that linearly reciprocates within the valve housing to open and close the flow path; a valve stem connected to the valve element; a driver that moves the valve stem; a thermal buffer member mounted on the valve housing; a link mechanism that transmits the action of the driver to the valve stem; and a link base that supports the link mechanism. The valve stem has a base end portion and a front end portion. The base end portion is connected to the valve element and extends along the moving direction of the valve element from the base end portion. The front end portion is located outside the valve housing. The thermal buffer member has: a thermal buffer plate that moves away from the valve housing toward the front end side in the axial direction in which the valve stem extends, on the front end side on the side of the front end portion with respect to the base end portion and on the base end side opposite to the front end side; and a support column that fixes the thermal buffer plate so as not to be relatively movable with respect to the valve housing. The driver has: a driver housing; and a driver rod that extends along the axial direction from inside the driver housing and moves along the axial direction with respect to the driver housing. The link base is fixed to the thermal buffer member and extends along a direction perpendicular to the axial direction from the thermal buffer member. The driver housing is fixed to the link base. The link mechanism is disposed on the front end side closer than the edge on the base end side of the link base.

[0012] The steam turbine device according to the present invention includes the above-described steam valve and a steam turbine driven by steam passing through the steam valve.

[0013] The link support assembly according to the present invention is a link support assembly of a steam valve having the following mechanism: a valve housing in which a steam flow path is formed inside; a valve element that linearly reciprocates within the valve housing to open and close the flow path; a valve stem connected to the valve element; a driver that moves the valve stem; and a link mechanism that transmits the action of the driver to the valve stem.

[0014] The link support assembly includes a thermal buffer member that can be mounted on the valve housing and a link base that can support the link mechanism. The thermal buffer member has: a thermal buffer plate that is spaced apart from the valve housing toward the front end side in the axial direction in which the valve stem extends, among the front end side and the base end side; and a support column that extends along the axial direction and fixes the thermal buffer plate so as not to be relatively movable with respect to the valve housing. An insertion hole that penetrates along the axial direction and through which the valve stem can be inserted is formed in the thermal buffer plate. The link base has: a separation member that is fixed to the thermal buffer member and extends from the thermal buffer member along a first side in a direction perpendicular to the axis perpendicular to the axial direction; and a driver fixing plate that is directly or indirectly fixed to an end portion on the first side of the separation member and can fix the housing of the driver. A rod insertion hole that penetrates along the axial direction and through which the driver rod of the driver can be inserted is formed in the driver fixing plate. A pin mounting portion is formed in the separation member, and a pin that rotatably supports one link included in the link mechanism can be mounted on the pin mounting portion.

[0015] Advantages of the Invention

[0016] According to one aspect of the present invention, malfunction due to the influence of heat can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The drawing is an explanatory view showing a schematic structure of a steam turbine device according to an embodiment of the present invention.

[0018] Figure 2 The drawing is a cross-sectional view showing a structure of a steam valve according to an embodiment of the present invention.

[0019] Figure 3 The drawing is an explanatory view showing an arrangement of a steam valve with respect to a steam turbine according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] Hereinafter, with reference to the drawings, an embodiment of the present invention and its modification will be described in detail.

[0021] In an embodiment of a steam valve and a steam turbine device including the steam valve according to the present invention, reference is made to Figure 1 A description will be given of the steam turbine device.

[0022] (Structure of the steam turbine device)

[0023] As Figure 1 shown, the steam turbine device 1 mainly includes a steam turbine 2 driven by steam and a steam valve 20.

[0024] The steam turbine 2 includes a housing 3 and a rotor 4.

[0025] The housing 3 is in the shape of a cylinder extending in the direction of the central axis O of the rotor 4. A steam inlet 3a is formed on the first side in the direction of the central axis O of the housing 3. A steam outlet 3b is formed on the second side in the direction of the central axis O of the housing 3. A plurality of stationary vane rows 5 are provided at intervals in the direction of the central axis O within the housing 3. Each stationary vane row 5 extends from the inner peripheral surface of the housing 3 toward the radially inner side. Each stationary vane row 5 is composed of a plurality of stationary vanes arranged along the circumferential direction around the central axis O.

[0026] The rotor 4 includes a rotor shaft 6 and a rotating vane row 7. The rotor shaft 6 is provided so as to penetrate through the inside of the housing 3 in the direction of the central axis O. The rotor shaft 6 is supported such that both ends thereof can rotate freely around the central axis O through bearings 8A and 8B. A plurality of rotating vane rows 7 are provided at intervals in the direction of the central axis O integrally with the rotor shaft 6. Inside the housing 3, the stationary vane rows 5 and the rotating vane rows 7 are alternately arranged in the direction of the central axis O. Each rotating vane row 7 extends from the outer peripheral surface of the rotor shaft 6 toward the radially outer side. Each rotating vane row 7 is composed of a plurality of rotating vanes arranged along the circumferential direction around the central axis O.

[0027] In the steam turbine 2, steam supplied from a steam supply source such as a boiler (not shown) is introduced into the housing 3 from the steam inlet 3a. The rotor 4 is rotationally driven around the central axis O by the steam introduced into the housing 3. For example, a generator 9 is connected to the rotor shaft 6 of the rotor 4. The rotation of the rotor shaft 6 is transmitted to the generator 9, and power generation is performed in the generator 9.

[0028] (Structure of the steam valve)

[0029] A steam valve 20 is provided in a steam supply pipe 10 connecting a steam supply source (not shown) and the steam inlet 3a of the steam turbine 2. The steam valve 20 interrupts or continues the flow of steam supplied to the steam inlet 3a through the steam supply pipe 10. The steam valve 20 can adjust the flow rate of steam supplied to the steam inlet 3a through the steam supply pipe 10.

[0030] As Figure 2 shown, the steam valve 20 includes a valve housing 30, a valve element 40, a valve stem 41, a driver 50, a thermal buffer member 45, a link mechanism 60, and a link base 80. In addition, in the present embodiment, the link support assembly 90 is configured to include the thermal buffer member 45 and the link base 80.

[0031] (Structure of the valve housing)

[0032] The valve housing 30 includes a housing main body 31. The housing main body 31 forms a steam flow path 33 inside. The flow path 33 includes a valve chamber 34, a steam inlet flow path portion 35, and a steam outlet flow path portion 36.

[0033] The valve chamber 34 houses the valve element 40.

[0034] The vapor inlet flow path portion 35 is formed to communicate the inlet side outer surface 31s of the housing main body 31 with the valve chamber 34. In the embodiment of the present invention, the inlet side outer surface 31s faces the first side Dv1 in the axis perpendicular direction Dv orthogonal to the axial direction Da in which the valve stem 41 described later extends. The vapor inlet flow path portion 35 extends from the valve chamber 34 toward the first side Dv1 in the axis perpendicular direction Dv and opens at the inlet side outer surface 31s. Vapor is supplied from a vapor supply source (not shown) to the vapor inlet flow path portion 35.

[0035] The vapor outlet flow path portion 36 is formed to communicate the outlet side outer surface 31t of the housing main body 31 with the valve chamber 34. In the embodiment of the present invention, the outlet side outer surface 31t faces the second side Dv2 in the axis perpendicular direction Dv. The vapor outlet flow path portion 36 has an outlet first flow path portion 36a extending along the axial direction Da from the valve chamber 34, and an outlet second flow path portion 36b continuous with the outlet first flow path portion 36a and extending along the second side Dv2 in the axis perpendicular direction Dv. The outlet second flow path portion 36b opens at the outlet side outer surface 31t. A cylindrical valve seat member 37 is provided in the vapor outlet flow path portion 36. A valve seat 37v is formed in the valve seat member 37 so as to face the inside of the valve chamber 34. The vapor supplied from a vapor supply source (not shown) through the vapor supply pipe 10 passes through the vapor inlet flow path portion 35, the valve chamber 34, and the vapor outlet flow path portion 36 constituting the flow path 33, and is transported to the vapor inlet 3a of the vapor turbine 2.

[0036] In the housing main body 31, a valve stem insertion hole 32 is formed in the housing outer wall portion 31w on the side where the vapor outlet flow path portion 36 is formed with respect to the valve chamber 34 in the axial direction Da. The valve stem insertion hole 32 penetrates the housing outer wall portion 31w along the axial direction Da.

[0037] (Structure of the valve element)

[0038] The valve element 40 is provided in the valve chamber 34. The valve element 40 is provided so as to be linearly movable in the valve chamber 34 along the axial direction Da (moving direction Dm), and is capable of contacting and separating from the valve seat 37v of the valve seat member 37. In a state where the valve element 40 is in contact with the valve seat 37v, the flow path 33 is blocked. The valve element 40 opens the flow path 33 by separating from the valve seat 37v along the moving direction Dm. Thus, the valve element 40 opens and closes the flow path 33.

[0039] The valve core 40 is connected to the valve stem 41. The valve stem 41 extends along the axial direction Da (the moving direction Dm) of the valve core 40. The valve stem 41 has a base end portion 41a and a front end portion 41b. The base end portion 41a of the valve stem 41 is connected to the valve core 40. The front end portion 41b of the valve stem 41 penetrates through the valve stem insertion hole 32 and is located outside the valve housing 30. The valve stem 41 is inserted inside a cylindrical bushing 39 provided in the valve stem insertion hole 32. The valve stem 41 is supported so as to be able to reciprocate along the moving direction Dm of the valve core 40 by contacting the inner peripheral surface of the bushing 39. The movement of the valve stem 41 in a direction other than the moving direction Dm of the valve core 40 is restricted by the bushing 39. By the valve stem 41 reciprocating along the moving direction Dm, the valve core 40 linearly reciprocates along the moving direction Dm inside the valve housing 30 and contacts or separates from the valve seat 37v of the valve seat member 37.

[0040] (Structure of the thermal buffer member)

[0041] The thermal buffer member 45 is mounted on the valve housing 30. The thermal buffer member 45 is provided on the side where the valve stem 41 protrudes from the valve housing 30 to the outside of the valve housing 30 with respect to the valve housing 30. The thermal buffer member 45 has a base plate 48, a thermal buffer plate 46, and support columns 47. The base plate 48 is mounted on the outer wall portion 31w of the housing of the valve housing 30. The base plate 48 is in the shape of a plate orthogonal to the axial direction Da. The thermal buffer plate 46 is arranged at an interval in the axial direction Da with respect to the valve housing 30 and the base plate 48. The thermal buffer plate 46 is arranged so as to be away from the valve housing 30 toward the front end side Dat in the axial direction Da, on the front end side Dat which is the front end portion 41b side with respect to the base end portion 41a of the valve stem 41 and on the base end side Dab which is the side opposite to the front end side Dat. The thermal buffer plate 46 is in the shape of a plate orthogonal to the axial direction Da. The support columns 47 fix the thermal buffer plate 46 so as not to be relatively movable with respect to the valve housing 30. A plurality of support columns 47 are provided between the base plate 48 mounted on the valve housing 30 and the thermal buffer plate 46. Each support column 47 extends along the axial direction Da and connects the base plate 48 and the thermal buffer plate 46. Insertion holes 48h, 46h through which the valve stem 41 is inserted are respectively formed in the base plate 48 and the thermal buffer plate 46.

[0042] (Structure of the link base)

[0043] The link base 80 is fixed to the thermal buffer member 45. The link base 80 extends from the thermal buffer member 45 along the first side Dv1 of the axis perpendicular direction Dv perpendicular to the axial direction Da. The link base 80 integrally has a separating member 81, a separating member 82, a driver fixing plate 83, and a cylindrical wall portion 84. The separating member 81 and the separating member 82 have a bottom plate 81 and a rib plate 82. The bottom plate 81 is continuously formed with the thermal buffer plate 46 of the thermal buffer member 45. The bottom plate 81 is in a plate shape orthogonal to the axial direction Da. A link insertion hole 81h for inserting the intermediate link 63 is formed in the bottom plate 81. The rib plate 82 is formed on the proximal end side Dab with respect to the bottom plate 81 in the axial direction Da. The rib plate 82 is orthogonal to the bottom plate 81 and extends along the axis perpendicular direction Dv. One end of the rib plate 82 is joined to the thermal buffer plate 46 of the thermal buffer member 45 via an end plate 85. The driver fixing plate 83 is mounted on the driver housing 51 of the driver 50 described later. The driver fixing plate 83 is in a plate shape orthogonal to the axial direction Da. A rod insertion hole 53h for inserting the driver rod 52 described later is formed in the driver fixing plate 83. The cylindrical wall portion 84 extends from the driver fixing plate 83 toward the front end side Dat of the axial direction Da. When viewed from the axial direction Da, the cylindrical wall portion 84 is in a cylindrical shape with a rectangular or circular cross section. In the cylindrical wall portion 84, the rib plate 82 is welded to the second side Dv2 in the axis perpendicular direction Dv. Thus, the aforementioned driver fixing plate 83 is indirectly fixed to the end portions on the first side of the separating member 81 and the separating member 82. The driver rod 52 is accommodated in the cylindrical wall portion 84. In addition, the driver fixing plate 83 can be directly fixed to the end portions on the first side of the separating member 81 and the separating member 82.

[0044] (Structure of the driver)

[0045] The driver 50 moves the valve stem 41 along the moving direction Dm of the valve element 40. The driver 50 is a hydraulic cylinder, an electric driver, etc. The driver 50 has a driver housing 51 and a driver rod 52. The driver housing 51 is fixed to the link base 80. The driver housing 51 is disposed closer to the proximal end side Dab than the edge 80e on the front end side Dat of the link base 80. In the axial direction Da, the driver housing 51 is disposed on the proximal end side Dab with respect to the link base 80. That is, the driver 50 and the steam valve 20 are disposed on the same side with respect to the link base 80. The driver rod 52 extends along the axial direction Da from inside the driver housing 51. The driver rod 52 moves along the axial direction Da with respect to the driver housing 51.

[0046] (Structure of the link mechanism)

[0047] The link mechanism 60 transmits the action of the driver 50 to the valve stem 41. The link mechanism 60 has a lever 61, a valve stem link 62, an intermediate link 63, and a driver link 65. The link mechanism 60 is disposed closer to the front end side Dat than the edge 80f on the proximal end side Dab of the link base 80.

[0048] The lever 61 has a first end portion 61a of the lever, a second end portion 61b of the lever, and an intermediate portion 61c between the first end portion 61a and the second end portion 61b of the lever. The lever 61 extends in a direction intersecting the axial direction Da.

[0049] The valve stem link 62 extends in a direction connecting the front end portion 41b of the valve stem 41 and the first end portion 61a of the lever. The valve stem link 62 has a first end portion 62a of the valve stem link and a second end portion 62b of the valve stem link. The first end portion 62a of the valve stem link 62 is attached to the front end portion 41b of the valve stem 41. The second end portion 62b of the valve stem link 62 is pivotally pin-joined to the first end portion 61a of the lever 61 via a connecting pin 64A and is rotatable about the connecting pin 64A.

[0050] The intermediate link 63 extends in a direction connecting the intermediate portion 80c of the link base 80 and the intermediate portion 61c of the lever 61. The intermediate link 63 has a first end portion 63a of the intermediate link and a second end portion 63b of the intermediate link. The first end portion 63a of the intermediate link 63 is pivotally pin-joined to the intermediate portion 80c of the link base 80 via a connecting pin 64D and is rotatable about the connecting pin 64D. Further, the intermediate portion 80c has a rib plate 82 as a part of the link base 80. Therefore, a pin mounting portion 82a for mounting the connecting pin 64D is formed on the rib plate 82. The first end portion 63a of the intermediate link 63 is pin-joined to the rib plate 82. The second end portion 63b of the intermediate link 63 is pivotally pin-joined to the intermediate portion 61c of the lever 61 via a connecting pin 64E and is rotatable about the connecting pin 64E.

[0051] The driver link 65 extends in a direction connecting the bracket 52d provided at the front end portion of the driver rod 52 and the second end portion 61b of the lever 61. The driver link 65 has a first end portion 65a of the driver link and a second end portion 65b of the driver link. The first end portion 65a of the driver link 65 is pivotally pin-joined to the bracket 52d provided at the front end portion of the driver rod 52 via a connecting pin 64B and is rotatable about the connecting pin 64B. The bracket 52d is provided as a part of the driver rod 52. The second end portion 65b of the driver link 65 is pivotally pin-joined to the second end portion 61b of the lever 61 via a connecting pin 64C and is rotatable about the connecting pin 64C.

[0052] As Figure 2 、 Figure 3 shown, in the above-described steam valve 20, the valve housing 30 and the driver 50 are disposed above the link base 80 and the link mechanism 60. That is, the steam valve 20 is provided such that the front end side Dat becomes the lower side.

[0053] (Operation of the steam valve)

[0054] Such a steam valve 20 swings the lever 61 by actuating the driver 50, thereby moving the valve stem 41 and the valve element 40 in the moving direction Dm along the axial direction Da. If the driver rod 52 of the driver 50 is moved (extended or retracted) from the driver housing 51 in the moving direction Dm, the lever 61 swings about the middle portion 61c of the lever 61. As a result, the valve stem 41 connected to the first lever end 61a of the lever 61 via the valve stem link 62 moves in the moving direction Dm of the valve element 40. Thereby, the valve element 40 contacts or separates from the valve seat 37v, thereby opening and closing the flow path 33.

[0055] (Function and effect)

[0056] In the steam valve 20 of the above-described embodiment, since the heat buffer member 45 is provided on the valve housing 30, the heat of the valve housing 30 that has increased in temperature due to the steam heat is transferred to the heat buffer member 45, and a part of it is dissipated into the atmosphere. And, since the heat buffer member 45 includes the heat buffer plate 46 fixed at a position away from the valve housing 30 toward the front end side Dat by the support column 47, the heat from the valve housing 30 can be suppressed from reaching the front end side Dat of the valve stem 41 through the heat buffer plate 46. In this way, the heat transferred to the link mechanism 60 can be suppressed, and the thermal expansion of the link mechanism 60 can be suppressed.

[0057] As a result, it is possible to suppress malfunction of the steam valve 20 due to the influence of heat.

[0058] Among them, when the driver housing 51 is fixed to a portion separately provided from the valve housing 30 such as the ground without using the above-described link base 80, the distance between the driver housing 51 and the valve housing 30 in the axis perpendicular direction Dv is fixed. Thus, when the link mechanism 60 thermally deforms in the axis perpendicular direction Dv due to the heat from the valve housing 30, since the distance between the driver housing 51 and the valve housing 30 in the axis perpendicular direction Dv is fixed, stress due to thermal deformation is generated in the link mechanism 60.

[0059] In contrast, when the drive housing 51 is fixed to the above-described link base 80, heat from the valve housing 30 is transferred to the link base 80 via the heat buffer member 45. Therefore, the link base 80 itself undergoes thermal deformation due to the heat transferred from the heat buffer member 45. Thus, by fixing the drive housing 51 to the link base 80 that has undergone thermal deformation, the difference in the amount of deformation of the thermal deformation generated in the link mechanism 60 becomes smaller. Therefore, the difference between the displacement amount based on the thermal deformation generated in the link mechanism 60 and the relative displacement amount between the valve element 40 (valve stem 41) and the drive housing 51 becomes smaller. Therefore, it is possible to suppress the stress applied to the link mechanism 60 due to the thermal deformation force. As a result, it is possible to suppress the malfunction of the steam valve 20 due to the influence of heat.

[0060] Moreover, in the above-described steam valve 20, the first end portion 62a of the valve stem link 62 of the valve stem link is attached to the front end portion 41b of the valve stem �1. The second end portion 62b of the valve stem link 62 is pin-joined to the first end portion 61a of the lever 61. The first end portion 63a of the intermediate link 63 is pin-joined to the link base 80. The second end portion 63b of the intermediate link 63 is pin-joined to the intermediate portion 61c between the first end portion 61a and the second end portion 61b of the lever 61. The first end portion 65a of the drive link 65 is pin-joined to the drive rod 52. The second end portion 65b of the drive link 65 is pin-joined to the second end portion 61b of the lever 61.

[0061] Therefore, when the drive rod 52 is moved in the axial direction Da, the lever 61 swings about the intermediate portion 61c of the lever 61. As a result, the valve stem 41 connected to the first end portion 61a of the lever 61 via the valve stem link 62 moves in the moving direction Dm of the valve element 40, and the flow path 33 is opened and closed at the valve element 40. At this time, even if the lever 61 swings due to the movement of the drive rod 52, no displacement occurs in the direction crossing the moving direction Dm of the valve element 40 at the first end portion 61a of the lever 61 that is pin-joined to the second end portion 62b of the valve stem link 62. When the lever 61 swings, displacement occurs in the direction crossing the moving direction Dm of the drive rod 52 generated in the lever 61 at the pin-joined portion between the intermediate link 63 and the lever 61 and at the pin-joined portion between the drive link 65 and the lever 61, and is absorbed by the rotation of the intermediate link 63 and the drive link 65.

[0062] Moreover, in the above-described steam valve 20, the driver housing 51 is disposed on the base end side Dab rather than on the edge 80e of the front end side Dat of the link base 80. Thus, the driver housing 51 is disposed on the same side as the valve element 40 with respect to the link base 80 in the axial direction Da. In this way, by disposing the driver housing 51 and the valve element 40 on the same side with respect to the link base 80 in the axial direction Da, the height dimension of the steam valve 20 in the axial direction Da can be reduced.

[0063] Moreover, in the above-described steam turbine device 1, by including the steam valve 20 as described above, malfunction of the steam valve 20 due to the influence of heat can be suppressed.

[0064] Moreover, in the above-described steam turbine device 1, since the front end side Dat of the steam valve 20 is set to be the lower side, the driver housing 51 and the valve element 40 are disposed on the upper side with respect to the link base 80. Thus, since the steam valve 20 can be disposed lower, the installation level L of the steam valve 20 from the installation surface F and the maximum height H of the steam valve 20 can be suppressed to be low. Along with this, the installation height of the steam turbine 2 can also be suppressed to be low.

[0065] <Supplementary Note>

[0066] The steam valve 20 and the steam turbine device 1 including the steam valve 20 described in the embodiment are understood as follows, for example.

[0067] (1) The steam valve 20 involved in the first mode includes: a valve housing 30 with a steam flow path 33 formed inside; a valve element 40 that linearly reciprocates within the valve housing 30 to open and close the flow path 33; a valve stem 41 connected to the valve element 40; a driver 50 that moves the valve stem 41; a thermal buffer member 45 installed on the valve housing 30; a link mechanism 60 that transmits the action of the driver 50 to the valve stem 41; and a link base 80 that supports the link mechanism 60. The valve stem 41 has a base end portion 41a and a front end portion 41b. The base end portion 41a is connected to the valve element 40 and extends along the moving direction Dm of the valve element 40 from the base end portion 41a. The front end portion 41b is located outside the valve housing 30. The thermal buffer member 45 has: a thermal buffer plate 46 that moves away from the valve housing 30 toward the front end side Dat on the front end side Dat of the base end portion 41a in the axial direction Da in which the valve stem 41 extends and on the base end side Dab opposite to the front end side Dat; and a support column 47 that fixes the thermal buffer plate 46 so as not to be relatively movable with respect to the valve housing 30. The driver 50 has: a driver housing 51; and a driver rod 52 that extends along the axial direction Da from within the driver housing 51 and moves along the axial direction Da with respect to the driver housing 51. The link base 80 is fixed to the thermal buffer member 45 and extends from the thermal buffer member 45 along the axial perpendicular direction Dv perpendicular to the axial direction Da. The driver housing 51 is fixed to the link base 80. The link mechanism 60 is disposed on the front end side Dat closer than the edge 80f of the base end side Dab of the link base 80.

[0068] In this steam valve 20, since the thermal buffer member 45 is provided on the valve housing 30, the heat of the valve housing 30 that rises in temperature due to steam heat is transferred to the thermal buffer member 45, and a part of it is dissipated into the atmosphere. And since the thermal buffer member 45 has the thermal buffer plate 46 fixed at a position away from the valve housing 30 toward the front end side Dat by the support column 47, the heat from the valve housing 30 can be suppressed from spreading to the front end side Dat of the valve stem 41 through the thermal buffer plate 46. Thus, the heat transmitted to the link mechanism 60 can be suppressed, and the thermal expansion of the link mechanism 60 can be suppressed.

[0069] Further, the link base 80 of the drive housing 51 to which the drive 50 is fixed is fixed to the heat buffer member 45. Heat from the valve housing 30 is transmitted to the link base 80 via the heat buffer member 45. Therefore, the link base 80 undergoes thermal deformation due to the heat transmitted from the heat buffer member 45. Thus, compared with the case where the drive housing 51 is fixed to a portion such as the ground that is separately provided from the valve housing 30, by fixing the drive housing 51 to the link base 80 that undergoes thermal deformation, the difference in the amount of deformation of the thermal deformation generated in the link mechanism 60 becomes smaller. Therefore, the difference between the displacement amount based on the thermal deformation generated in the link mechanism 60 and the relative displacement amount between the valve element 40 (valve stem 41) and the drive housing 51 becomes smaller. Therefore, it is possible to suppress the stress applied to the link mechanism 60 due to the thermal deformation force. As a result, it is possible to suppress the malfunction of the steam valve 20 due to the influence of heat.

[0070] (2) The steam valve 20 according to the second aspect is the steam valve 20 according to (1), wherein the link mechanism 60 includes: a lever 61 having a lever first end 61a and a lever second end 61b; a valve stem link 62 having a valve stem link first end 62a and a valve stem link second end 62b; an intermediate link 63 having an intermediate link first end 63a and an intermediate link second end 63b; and a drive link 65 having a drive link first end 65a and a drive link second end 65b. The valve stem link first end 62a of the valve stem link 62 is mounted on the front end 41b of the valve stem 41. The valve stem link second end 62b of the valve stem link 62 is pin-joined to the lever first end 61a of the lever 61. The intermediate link first end 63a of the intermediate link 63 is pin-joined to the link base 80. The intermediate link second end 63b of the intermediate link 63 is pin-joined to an intermediate portion 61c between the lever first end 61a and the lever second end 61b of the lever 61. The drive link first end 65a of the drive link 65 is pin-joined to the drive rod 52. The drive link second end 65b of the drive link 65 is pin-joined to the lever second end 61b of the lever 61.

[0071] In such a steam valve 20, a first end portion 62a of a valve stem link 62 is mounted on a front end portion 41b of a valve stem 41. A second end portion 62b of the valve stem link 62 is pin-joined to a first end portion 61a of a lever 61. A first end portion 63a of an intermediate link 63 is pin-joined to a link base 80. A second end portion 63b of the intermediate link 63 is pin-joined to an intermediate portion 61c between a first end portion 61a and a second end portion 61b of the lever 61. A first end portion 65a of a driver link 65 is pin-joined to a driver rod 52. A second end portion 65b of the driver link 65 is pin-joined to the second end portion 61b of the lever 61.

[0072] Therefore, if the driver rod 52 is moved in the axial direction Da, the lever 61 swings about an intermediate portion 61c of the lever 61. As a result, the valve stem 41 connected to the first end portion 61a of the lever 61 via the valve stem link 62 moves in the moving direction Dm of a valve element 40, and a flow path 33 is opened and closed at the valve element 40. At this time, even if the lever 61 swings due to the movement of the driver rod 52, no displacement in a direction crossing the moving direction Dm of the valve element 40 occurs in the first end portion 61a of the lever 61 that is pin-joined to the second end portion 62b of the valve stem link 62. When the lever 61 swings, displacements in a direction crossing the moving direction Dm of the driver rod 52 generated in the lever 61 occur at the pin-joined portions of the intermediate link 63 and the lever 61 and at the pin-joined portion of the driver link 65 and the lever 61, and are absorbed by the rotation of the intermediate link 63 and the driver link 65.

[0073] (3) The steam valve 20 according to the third aspect is the steam valve 20 of (1) or (2), wherein the driver housing 51 is disposed closer to a base end side Dab than an edge of the front end side Dat of the link base 80.

[0074] As a result, the driver housing 51 is disposed on the same side as the valve element 40 with respect to the link base 80 in the axial direction Da. Thus, by disposing the driver housing 51 and the valve element 40 on the same side with respect to the link base 80 in the axial direction Da, the height dimension of the steam valve 20 in the axial direction Da can be reduced.

[0075] (4) The steam turbine device 1 according to the fourth aspect includes the steam valve 20 of any one of (1) to (3) and a steam turbine 2 driven by steam that passes through the steam valve 20.

[0076] As a result, the steam turbine device 1 can suppress malfunction of the steam valve 20 due to the influence of heat by including the steam valve 20 as described above.

[0077] (5) The steam turbine device 1 according to the fifth aspect includes the steam valve 20 of (3), and a steam turbine 2 driven by the steam passing through the steam valve 20. The steam valve 20 is arranged such that the front end side Dat is on the lower side.

[0078] Thus, by including the steam valve 20 as described above, the steam turbine device 1 can suppress malfunction of the steam valve 20 due to the influence of heat. And since the front end side Dat of the steam valve 20 is arranged on the lower side, the drive housing 51 and the valve element 40 are arranged on the upper side with respect to the link base 80. Thus, since the steam valve 20 can be arranged to descend downward, the installation height of the steam turbine 2 can also be suppressed to be low.

[0079] And the link support assembly 90 described in the embodiment is grasped as follows, for example.

[0080] (6) The link support assembly 90 according to the sixth aspect is a link support assembly of the steam valve 20 having the following mechanism: a valve housing 30 in which a steam flow path 33 is formed inside; a valve element 40 that linearly reciprocates inside the valve housing 30 to open and close the flow path 33; a valve stem 41 connected to the valve element 40; a driver 50 that moves the valve stem 41; and a link mechanism 60 that transmits the operation of the driver 50 to the valve stem 41.

[0081] This link support assembly 90 includes a heat buffer member 45 that can be mounted on the valve housing 30 and a link base 80 that can support the link mechanism 60. The heat buffer member 45 has: a heat buffer plate 46 that is separated from the valve housing 30 toward the front end side Dat in the axial direction Da in which the valve stem 41 extends and the base end side Dab; and a support column 47 that extends along the axial direction Da and fixes the heat buffer plate 46 so as not to be relatively movable with respect to the valve housing 30. An insertion hole 46h that penetrates along the axial direction Da and through which the valve stem 41 can be inserted is formed in the heat buffer plate 46. The link base 80 has: separation members 81, 82 that are fixed to the heat buffer member 45 and extend from the heat buffer member 45 on the first side Dv1 in the axis perpendicular direction Dv perpendicular to the axial direction Da; and a driver fixing plate 83 that is directly or indirectly fixed to the ends of the separation members 81, 82 on the first side Dv1 and can fix the housing 51 of the driver 50. A rod insertion hole 53h that penetrates along the axial direction Da and through which the driver rod 52 of the driver 50 can be inserted is formed in the driver fixing plate 83. A pin mounting portion 82a is formed on the separation members 81, 82, and the pin mounting portion 82a can mount a pin 64D that rotatably supports a link 63 included in the link mechanism 60.

[0082] Industrial Applicability

[0083] In the steam valve according to one embodiment of the present invention, malfunction due to the influence of heat can be suppressed.

[0084] Reference Signs

[0085] 1 - steam turbine equipment, 2 - steam turbine, 3 - casing, 3a - steam inlet, 3b - steam outlet, 4 - rotor, 5 - stationary blade row, 6 - rotor shaft, 7 - rotating blade row, 8A, 8B - bearings, 9 - generator, 10 - steam supply pipe, 20 - steam valve, 30 - valve casing, 31 - casing body, 31s - outer side surface on the inlet side, 31t - outer side surface on the outlet side, 31w - outer wall portion of the casing, 32 - valve stem insertion hole, 33 - flow path, 34 - valve chamber, 35 - steam inlet flow path portion, 36 - steam outlet flow path portion, 36a - first outlet flow path portion, 36b - second outlet flow path portion, 37 - valve seat member, 37v - valve seat, 39 - bushing, 40 - valve core, 41 - valve stem, 41a - base end portion, 41b - front end portion, 45 - heat buffer member, 46 - heat buffer plate, 46h - insertion hole, 47 - support column, 48 - base plate, 48h - insertion hole, 50 - actuator, 51 - actuator casing, 52 - actuator rod, 52d - bracket, 53h - rod insertion hole, 60 - link mechanism, 61 - lever, 61a - first end portion of the lever, 61b - second end portion of the lever, 61c - intermediate portion, 62 - valve stem link, 62a - first end portion of the valve stem link, 62b - second end portion of the valve stem link, 63 - intermediate link, 63a - first end portion of the intermediate link, 63b - second end portion of the intermediate link, 64A, 64B, 64C, 64D, 64E - connecting pins, 65 - actuator link, 65a - first end portion of the actuator link, 65b - second end portion of the actuator link, 80 - link base, 80c - intermediate portion of the base, 80e - edge, 80f - edge, 81, 82 - separating members, 81 - bottom plate, 81h - link insertion hole, 82 - rib plate, 82a - pin mounting portion, 83 - actuator fixing plate, 84 - cylindrical wall portion, 85 - end plate, 90 - link support assembly, Da - axial direction, Dab - base end side, Dat - front end side, Dm - moving direction, Dv - direction perpendicular to the axis, Dv1 - first side, Dv2 - second side, F - setting surface, H - maximum height, L - setting level, O - central axis.

Claims

1. A steam valve, comprising: A valve housing having a steam flow path formed therein; A valve core that linearly reciprocates within the valve housing to open and close the flow path; A valve stem connected to the valve core; A driver that moves the valve stem; A thermal buffer member mounted on the valve housing; A link mechanism that transmits the action of the driver to the valve stem; And A link base that supports the link mechanism, The valve stem has a base end portion and a front end portion. The base end portion is connected to the valve core and extends along the moving direction of the valve core from the base end portion. The front end portion is located outside the valve housing. The thermal buffer member has: a thermal buffer plate that moves away from the valve housing toward the front end side on the front end side and the base end side opposite to the front end side with respect to the base end portion in the axial direction in which the valve stem extends; and a support column that fixes the thermal buffer plate so as not to be relatively movable with respect to the valve housing. The driver has: a driver housing; and a driver rod that extends along the axial direction from within the driver housing and moves along the axial direction with respect to the driver housing. The link base is fixed to the thermal buffer member and extends from the thermal buffer member in a direction perpendicular to the axial direction. The driver housing is fixed to the link base. The link mechanism is disposed on the front end side with respect to the edge on the base end side of the link base.

2. The steam valve according to claim 1, wherein The link mechanism has: A lever having a first lever end portion and a second lever end portion; a valve stem link having a first valve stem link end portion and a second valve stem link end portion; an intermediate link having a first intermediate link end portion and a second intermediate link end portion; and a driver link having a first driver link end portion and a second driver link end portion. The first valve stem link end portion of the valve stem link is mounted on the front end portion of the valve stem. The second valve stem link end portion of the valve stem link is pin-joined to the first lever end portion of the lever. The first intermediate link end portion of the intermediate link is pin-joined to the link base. The second intermediate link end portion of the intermediate link is pin-joined to an intermediate portion between the first lever end portion and the second lever end portion of the lever. The first driver link end portion of the driver link is pin-joined to the driver rod. The second driver link end portion of the driver link is pin-joined to the second lever end portion of the lever.

3. The steam valve according to claim 1 or 2, wherein The driver housing is disposed on the base end side with respect to the edge on the front end side of the link base.

4. A steam turbine device, comprising: The steam valve according to any one of claims 1 to 3; and A steam turbine driven by steam passing through the steam valve.

5. A steam turbine device, comprising: The steam valve according to claim 3; and A steam turbine driven by steam passing through the steam valve, The steam valve is provided such that the front end side is the lower side.

6. A link support assembly for a steam valve, the steam valve comprising: A valve housing having a steam flow path formed therein; A spool valve core that linearly reciprocates within the valve housing to open and close the flow path; A valve stem connected to the spool valve core; A drive that moves the valve stem; and A link mechanism that transmits the movement of the drive to the valve stem, In the link support assembly, there are provided: A thermal buffer member that can be mounted on the valve housing; and A link base that can support the link mechanism, The thermal buffer member has: a thermal buffer plate that is separated from the valve housing toward the front end side in the axial direction in which the valve stem extends, among the front end side and the base end side; and a support column that extends along the axial direction and fixes the thermal buffer plate so as not to be relatively movable with respect to the valve housing, An insertion hole that penetrates along the axial direction and through which the valve stem can be inserted is formed in the thermal buffer plate, The link base has: a separation member that is fixed to the thermal buffer member and extends from the thermal buffer member along a first side in a direction perpendicular to the axis perpendicular to the axial direction; And a drive fixing plate that is directly or indirectly fixed to an end portion on the first side of the separation member and can fix the housing of the drive, A rod insertion hole that penetrates along the axial direction and through which the drive rod of the drive can be inserted is formed in the drive fixing plate, A pin mounting portion is formed on the separation member, and the pin mounting portion can mount a pin that rotatably supports one link of the link mechanism.

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