JP6049529B2 - Turbine casing support structure - Google Patents

Description

  The present invention relates to a support structure for a turbine casing that houses a moving blade, a stationary blade, and the like of a turbine in a steam turbine that generates electric power by rotationally driving a rotor using steam.

  In a general steam turbine, a turbine casing is configured such that an inner casing is provided in an outer casing and a steam inlet portion is provided in an upper portion, and is installed on a gantry. In the turbine casing, the rotor is rotatably supported inside, and the rotor blades are fixed to the rotor in a plurality of stages, while the stationary blades are fixed to the blade ring in the inner casing in a plurality of stages. ing. Therefore, when the steam enters the inner casing from the steam inlet during operation, the steam is spouted to the moving blade through the stationary blade supported by the blade ring through the partition wall, and the rotor rotates. Then, the generator connected to the rotor is driven.

  By the way, as described above, the turbine casing of this steam turbine houses a rotor and the like, the outer peripheral flange portion is fixed to the gantry, and the inside is maintained in a vacuum. As a support structure of the turbine casing in such a steam turbine, there is one described in the following patent document.

  The steam turbine casing support structure described in Patent Document 1 has a plurality of rib plates projectingly fixed to the outer surface of the outer casing of the steam turbine, and is slid onto a base plate attached to a foundation frame that supports the steam turbine. The foot plate placed movably is fixed to the rib plate with a gap from the outer surface of the external compartment. In addition, the steam turbine fixing device described in Patent Document 2 fixes a base plate with an anchor block and an adjustment liner attached to an embedded metal frame, and key-joins the base plate and an external casing.

Japanese Patent No. 3697130 Japanese Patent Application Laid-Open No. 01-092501

  Various structures as described above have been proposed as a structure for supporting a turbine casing in a steam turbine. However, all of these techniques improve the strength at the position where the turbine casing is fixed to the gantry, and there is a possibility that the structure becomes complicated and large in size to ensure sufficient strength.

  It is an object of the present invention to provide a turbine casing support structure that improves support rigidity while suppressing the complexity and size of the structure.

  In order to achieve the above object, a turbine casing support structure according to the present invention covers a steam turbine supported by a gantry from above, and a turbine casing in which an outer peripheral flange portion is fixed to the gantry. A restricting member for restricting the movement of the turbine casing is arranged on the gantry.

  Therefore, when the turbine casing moves in the vertical direction or the horizontal direction due to the occurrence of an earthquake or the like, the movement of the turbine casing is restricted by the restricting member. The support rigidity of the passenger compartment can be improved.

  In the turbine casing support structure according to the present invention, the limiting member is positioned outside the flange portion and fixed to the gantry.

  Therefore, by fixing the limiting member to the outside of the flange portion, the limiting member is fixed after fixing the turbine casing to the gantry, and the limiting member can be easily arranged.

  In the turbine casing support structure according to the present invention, the limiting member is arranged in parallel with a rotation axis of the steam turbine.

  Therefore, by arranging the limiting member in parallel with the rotation axis of the steam turbine, the limiting member can be efficiently arranged without obstructing the bearing that rotatably supports the turbine rotor.

  In the turbine casing support structure according to the present invention, the restricting member is disposed with a predetermined amount of clearance from the flange portion.

  Therefore, by disposing the restricting member with a predetermined amount of gap from the flange portion of the turbine casing, the stress of the turbine casing does not act on the restricting member at normal times, and the durability can be improved.

  The turbine casing support structure according to the present invention is characterized in that a damper is interposed in the gap.

  Therefore, by arranging the limiting member with the flange portion and the damper of the turbine casing, the limiting member receives after the stress of the turbine casing is attenuated by the damper, and the stress of the turbine casing can be efficiently received. it can.

  In the turbine casing support structure of the present invention, the limiting member includes a groove formed in the upper surface of the gantry, a resistance member fixed to the lower portion of the turbine casing and disposed in the groove, It has the damper arrange | positioned between a groove part and the said resistance member, It is characterized by the above-mentioned.

  Therefore, since the restricting member is disposed below the turbine casing, the restricting member is not exposed to the outside, and it is possible to prevent an increase in the arrangement space of the restricting member and improve the appearance quality.

  In the turbine casing support structure according to the present invention, the resistance member includes a first resistance plate along a vertical direction and a second resistance plate along a horizontal direction.

  Accordingly, the vertical and horizontal movements of the turbine casing can be attenuated by the first resistance plate and the second resistance plate.

  In the turbine casing support structure of the present invention, the limiting member limits vertical movement and horizontal movement of the turbine casing.

  Therefore, the movement of the turbine casing can be appropriately restricted.

  According to the turbine casing support structure of the present invention, since the restricting member that restricts the movement of the turbine casing is arranged on the gantry, the supporting rigidity can be improved while suppressing the complexity and size of the structure. .

FIG. 1 is a perspective view showing a turbine casing. FIG. 2 is a front view showing the support structure of the turbine casing according to the first embodiment of the present invention. FIG. 3 is a plan view showing a support structure of the turbine casing. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a cross-sectional view illustrating a turbine casing support structure according to a second embodiment of the present invention. FIG. 6 is a cross-sectional view showing a turbine casing support structure according to a third embodiment of the present invention. FIG. 7 is a partially cutaway front view showing a support structure for a turbine casing according to a fourth embodiment of the present invention. FIG. 8 is an exploded perspective view showing the limiting member. FIG. 9 is a cross-sectional view illustrating the limiting member. FIG. 10 is a cross-sectional view illustrating the limiting member.

  Exemplary embodiments of a support structure for a turbine casing according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a perspective view showing a turbine casing, FIG. 2 is a front view showing a supporting structure of the turbine casing according to the first embodiment of the present invention, and FIG. 3 is a plan view showing the supporting structure of the turbine casing. 4 is a cross-sectional view taken along the line IV-IV in FIG.

  Steam turbines are applied to power plants such as thermal power and nuclear power, and convert steam energy into rotational motion by rotating the turbine with generated steam. The generator is driven by the generated rotational force. It can generate electricity. The steam turbine is configured such that a turbine is rotatably supported by a turbine mount with a bearing, and the turbine is covered with a turbine casing from above. That is, in the steam turbine, an internal casing is arranged inside an external casing, a turbine rotor is arranged inside the internal casing, and a plurality of moving blades are fixed to the turbine rotor at predetermined intervals, while an internal casing is arranged. A plurality of stationary blades are fixed inside the casing so as to be positioned between the moving blades, and each end portion of the turbine rotor is rotatably supported by a bearing portion of the outer casing.

  In the first embodiment, as shown in FIG. 1, the turbine casing 11 is divided into an upper casing 13 and a lower casing 14 with a through hole (supporting portion) 12 that supports a turbine rotor (not shown) as a boundary. Yes. The upper casing 13 is configured by a curved roof portion 15 and front and rear vertical wall portions 16, a steam inlet 17 is formed in the roof portion 15, and a connecting flange portion 18 is integrally formed on the outer periphery of the lower portion. ing. The lower casing 14 is composed of front and rear vertical wall portions 19 and left and right vertical wall portions 20. A connection flange portion 21 is integrally formed on the outer periphery of the upper portion, and a mounting flange portion 22 is integrally formed on the lower portion. ing. The upper casing 13 and the lower casing 14 are connected to each other by connecting bolts 18 and 21 by fastening bolts (not shown). In the lower casing 14, the mounting flange portion 22 is fastened to the turbine mount 23 by fastening bolts (not shown).

  As shown in FIGS. 2 and 3, the support structure for the turbine casing of the first embodiment includes a limiting member 31 that limits the movement of the turbine casing 11 arranged on the turbine mount 23. The limiting member 31 is positioned outside the mounting flange portion 22 and is fixed to the turbine mount 23 with a plurality of fastening bolts 32. In this case, the limiting member 31 is disposed along the mounting flange portions 22 on both sides of the turbine casing 11 so as to be parallel to the rotation axis O of the steam turbine.

  That is, as shown in FIG. 4, the turbine casing 11 has a lower end portion of each vertical wall portion 19, 20 in the lower casing 14 fitted into a turbine accommodating portion 24 formed in the turbine mount 23, and a mounting flange portion. 22 is installed on the upper surface of the turbine mount 23. The mounting flange portion 22 of the turbine casing 11 has a plurality of mounting holes 22a formed at predetermined intervals along the longitudinal direction thereof. Then, the turbine casing 11 is fastened to the turbine mount 23 by the mounting flange portion 22 by each fastening bolt 25 being inserted through the mounting hole 22a from above and screwed into a screw hole 23a formed in the turbine mount 23. Is done.

  The limiting member 31 is attached to the upper surface of the turbine mount 23 along the horizontal direction, a vertical wall portion 34 bent in the vertical direction from the mounting portion 33, and bent in the horizontal direction from the vertical wall portion 34. And a horizontal wall portion 35. The attachment portion 33 of the restriction member 31 has a plurality of attachment holes 33a formed at predetermined intervals along the longitudinal direction. The restricting member 31 is fastened to the turbine mount 23 by the mounting portion 33 by the fastening bolts 32 being inserted from above the mounting holes 33a and screwed into the screw holes 23b formed in the turbine mount 23. .

  In this case, the vertical wall portion 34 of the limiting member 31 is disposed with a predetermined amount of the horizontal clearance S <b> 1 from the mounting flange portion 22 of the turbine casing 11. Further, the lateral wall portion 35 of the limiting member 31 is disposed with a predetermined amount of the vertical gap S2 from the mounting flange portion 22 of the turbine casing 11. Therefore, the turbine casing 11 can move without contacting the limiting member 31 by the horizontal gap S1 and the vertical gap S2, and the limiting member 31 is equal to or larger than the horizontal gap S1 and the vertical gap S2 of the turbine casing 11. Movement can be restricted.

  The limiting member 31 includes all the sides where the vertical wall portion 34 and the horizontal wall portion 35 are parallel to the rotation axis O of the steam turbine in the mounting flange portion 22 of the turbine casing 11 and the sides orthogonal to the rotation axis O of the steam turbine. It is possible to limit the movement in the two directions X and Y (see FIG. 3) that intersect (orthogonal) the horizontal direction in the turbine casing 11.

  As described above, in the turbine casing support structure according to the first embodiment, the turbine casing 11 has the mounting flange portion 22 fastened to the turbine mount 23 by the plurality of fastening bolts 25, and the outer side of the mounting flange portion 22 A restricting member 31 that restricts the movement of the turbine casing 11 is fastened to the turbine mount 23 by fastening bolts 32.

  Therefore, for example, when the turbine casing 11 receives a stress in the vertical direction or the horizontal direction when an earthquake occurs, the stress is supported by the turbine mount 23 via the plurality of fastening bolts 25. When the fastening bolt 25 can no longer support the stress and the turbine casing 11 moves in the vertical direction or the horizontal direction, the movement of the turbine casing 11 is restricted by the restricting member 31. Therefore, the turbine casing 11 is appropriately prevented from moving due to an earthquake or the like, and can improve safety.

  In this case, it is only necessary to fasten the restricting member 31 to the turbine mount 23 outside the turbine casing 11, and the complexity and size of the structure can be suppressed, and the support rigidity of the turbine casing 11 can be improved. Can do.

  In the turbine casing support structure according to the first embodiment, the limiting member 31 is positioned outside the mounting flange portion 22 of the turbine casing 11 and fixed to the turbine mount 23. After the turbine casing 11 is fixed to the turbine mount 23, the limiting member 31 is fixed to the turbine mount 23, and the limiting member 31 can be easily arranged.

  In the turbine casing support structure according to the first embodiment, the limiting member 31 is arranged in parallel with the rotation axis O of the steam turbine. Therefore, the restricting member 31 can be efficiently arranged without interfering with the bearing that rotatably supports the turbine rotor.

  In the turbine casing support structure according to the first embodiment, the limiting member 31 is disposed with a predetermined amount of gaps S1 and S2 from the mounting flange portion 22 of the turbine casing 11. Therefore, when the turbine casing 11 receives vertical or horizontal stress due to the occurrence of an earthquake, the stress is first supported by the turbine mount 23 via the plurality of fastening bolts 25, and the fastening bolts 25 apply stress. If it becomes impossible to support, the turbine casing 11 is supported by the restricting member 31. That is, if each fastening bolt 25 can support the stress due to the occurrence of an earthquake, the stress does not act on the limiting member 31 and the durability can be improved.

  In the turbine casing support structure according to the first embodiment, the restriction member 31 restricts the vertical movement and the horizontal movement of the turbine casing 11. Therefore, the movement of the turbine casing 11 can be limited appropriately.

  FIG. 5 is a cross-sectional view illustrating a turbine casing support structure according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the turbine casing support structure of the second embodiment, as shown in FIG. 5, a limiting member 31 that limits the movement of the turbine casing 11 is arranged on the turbine mount 23. The limiting member 31 is positioned outside the mounting flange portion 22 and is fixed to the turbine mount 23 with a plurality of fastening bolts 32. That is, the turbine casing 11 has a lower end fitted into a turbine accommodating portion 24 formed on the turbine mount 23, and a mounting flange portion 22 is installed on the upper surface of the turbine mount 23, and a turbine is provided by a plurality of fastening bolts (not shown). The frame 23 is fastened.

  The limiting member 31 has an attachment portion 33, a vertical wall portion 34, and a horizontal wall portion 35, and is fastened to the turbine mount 23 by a plurality of fastening bolts 32.

  The limiting member 31 is provided with a predetermined gap between the mounting flange portion 22 of the turbine casing 11 and a damper 36 is interposed in the gap. The damper 36 is made of, for example, an elastic member such as rubber or resin, oil, or the like. Therefore, the damper 36 is supported by the limiting member 31, and can receive and attenuate the horizontal stress and the vertical stress of the turbine casing 11.

  In the turbine casing support structure according to the second embodiment, the turbine casing 11 includes a mounting flange portion 22 fastened to the turbine mount 23 by a plurality of fastening bolts, and the turbine casing 11 outside the mounting flange portion 22. A restricting member 31 that restricts the movement of the motor is fastened to the turbine mount 23 by fastening bolts 32, and a damper 36 is interposed in the gap between the mounting flange portion 22 and the restricting member 31.

  Therefore, for example, when the turbine casing 11 receives stress in the vertical direction or the horizontal direction when an earthquake occurs, this stress is supported by the turbine mount 23 via the plurality of fastening bolts 32. When the fastening bolt 32 cannot support the stress and the turbine casing 11 moves in the vertical direction or the horizontal direction, the turbine casing 11 is attenuated by the damper 36 and moved by the limiting member 31. Will be limited. Therefore, the turbine casing 11 is appropriately prevented from moving due to an earthquake or the like, and can improve safety. In this case, the stress in the turbine casing 11 is attenuated by the damper 36, so that the limiting member 31 can efficiently receive the stress in the turbine casing 11, and the durability can be improved.

  FIG. 6 is a cross-sectional view showing a turbine casing support structure according to a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the turbine casing support structure of the third embodiment, as shown in FIG. 6, a limiting member 41 that limits the movement of the turbine casing 11 is arranged on the turbine mount 23. The restricting member 41 is positioned outside the mounting flange portion 22 and is fixed to the turbine mount 23 with a plurality of fastening bolts 42.

  The turbine casing 11 has a lower end fitted into a turbine accommodating portion 24 formed on the turbine mount 23, a mounting flange portion 22 is installed on the upper surface of the turbine mount 23, and a plurality of fastening bolts 42 pass through each mounting hole 42 a. It is fastened to the turbine mount 23 by being inserted from above and screwed into a screw hole 23 a formed in the turbine mount 23.

  The restricting member 41 is attached to the upper surface of the turbine mount 23 along the horizontal direction, the vertical wall portion 44 bent in the vertical direction from the mounting portion 43, and bent in the horizontal direction from the vertical wall portion 44. And a horizontal wall portion 45. The restricting member 41 is fastened to the turbine mount 23 by inserting a plurality of fastening bolts 42 from above through the mounting holes 43 a and screwing into the screw holes 23 a formed in the turbine mount 23.

  In this case, in the limiting member 41, the vertical wall portion 44 is in close contact with the end surface of the mounting flange portion 22 of the turbine casing 11, and the horizontal wall portion 45 is in close contact with the upper surface of the mounting flange portion 22 of the turbine casing 11. Therefore, the restricting member 41 can restrict the movement of the turbine casing 11 in the horizontal direction and the movement in the vertical direction.

  As described above, in the turbine casing support structure according to the third embodiment, the turbine casing 11 has the mounting flange portion 22 fastened to the turbine mount 23 by the plurality of fastening bolts 42, and the outside of the mounting flange portion 22. A restricting member 41 that restricts movement of the turbine casing 11 is fastened to the turbine mount 23 by fastening bolts 42.

  Therefore, for example, when the turbine casing 11 receives a stress in the vertical direction or the horizontal direction when an earthquake occurs, this stress is supported by the turbine mount 23 via the plurality of fastening bolts 42, and is restricted by the limiting member 41. Movement will be restricted. Therefore, the turbine casing 11 is appropriately prevented from moving due to an earthquake or the like, and can improve safety.

  In this case, it is only necessary to fasten the restricting member 41 to the turbine mount 23 outside the turbine casing 11, and the complexity and size of the structure can be suppressed, and the support rigidity of the turbine casing 11 can be improved. Can do.

  7 is a partially cutaway front view showing a support structure for a turbine casing according to a fourth embodiment of the present invention, FIG. 8 is an exploded perspective view showing a limiting member, and FIG. 9 is a cross-sectional view showing the limiting member, FIG. 10 is a cross-sectional view illustrating the limiting member. In addition, the same code | symbol is attached | subjected to the member which has the function similar to the Example mentioned above, and detailed description is abbreviate | omitted.

  In the turbine casing support structure of the fourth embodiment, as shown in FIG. 7, a limiting member 51 that limits the movement of the turbine casing 11 is arranged on the turbine mount 23. The limiting member 51 is disposed below the turbine casing 11.

  That is, as shown in FIGS. 7 and 8, the turbine mount 23 is positioned below both sides of the turbine casing 11 and has a pair of groove portions 52 formed on the upper surface portion. The pair of grooves 52 are arranged so as to be parallel to the rotation axis O of the steam turbine, and are composed of a bottom surface 52a, left and right side surfaces 52b, and front and rear end surfaces 52c, and an upper portion is open. On the other hand, in the turbine casing 11, a resistance member 53 protruding to the turbine mount 23 side is fixed to the lower part. The resistance member 53 has an upper end fixed to the lower surface of the turbine casing 11 and a first resistance plate 54 extending in the vertical direction, and an intermediate portion in the width direction fixed to the lower end of the first resistance plate 54 along the horizontal direction. And a second resistance plate 55.

  As shown in FIGS. 9 and 10, the resistance member 53 is formed in an inverted T shape by the first resistance plate 54 and the second resistance plate 55, and is disposed in the groove portion 52 of the turbine mount 23. A predetermined gap is secured without contacting the end face 52b and the end face 52c. Then, the oil (damper) 56 is filled in the groove 52, so that the oil is interposed between the groove 52 and the resistance member 53. The damper is not limited to oil and may be rubber or resin.

  In the fourth embodiment, the limiting member 51 includes a groove 52, a resistance member 53, and oil (damper) 56.

  The resistance member 53 is composed of the first resistance plate 54 and the second resistance plate 55. However, as shown in FIG. 10, a plurality of second resistance plates 57 orthogonal to the first resistance plate 54 and the second resistance plate 55 are provided. It may be provided.

  As described above, in the turbine casing support structure according to the fourth embodiment, the turbine casing 11 is moved by the restriction member 51 while the mounting flange portion 22 is fastened to the turbine mount 23 by the plurality of fastening bolts 25. As the limiting member 51, a groove portion 52 formed on the upper surface portion of the turbine mount 23, a resistance member 53 fixed to the lower portion of the turbine casing 11 and disposed in the groove portion 52, the groove portion 52 and the resistance member An oil 56 is provided as a damper disposed between the oil and the oil.

  Therefore, for example, when the turbine casing 11 receives a stress in the vertical direction or the horizontal direction when an earthquake occurs, the stress is supported by the turbine mount 23 via the plurality of fastening bolts 25. When the fastening bolt 25 can no longer support stress and the turbine casing 11 moves in the vertical direction or the horizontal direction, the movement of the turbine casing 11 is restricted by the restricting member 51. Therefore, the turbine casing 11 is appropriately prevented from moving due to an earthquake or the like, and can improve safety.

  That is, when the turbine casing 11 moves in the vertical direction or the horizontal direction, the resistance member 53 fixed to the lower portion of the turbine casing 11 moves in the groove 52 in the same direction. Here, since the groove portion 52 is filled with the oil 56, when the resistance member 53 moves in the oil 56, the movement (stress) is attenuated. Therefore, the restriction member 51 can restrict the movement of the turbine casing 11.

  In this case, since the limiting member 51 is disposed below the turbine casing 11, it is not necessary to secure an arrangement space for the limiting member 51 in the upper part of the turbine mount 23 outside the turbine casing 11. An increase in space can be prevented. Further, the limiting member 51 is not exposed to the outside, and the appearance quality can be improved.

  In the turbine casing support structure of the fourth embodiment, as the resistance member 53, a first resistance plate 54 along the vertical direction and a second resistance plate 55 along the horizontal direction are provided. Therefore, the movement of the turbine casing 11 in the vertical direction and the horizontal direction can be attenuated by the first resistance plate 54 and the second resistance plate 55.

  In the embodiment described above, the restricting members 31, 41, 51 are provided along the direction parallel to the rotation axis O of the steam turbine in the turbine casing 11, but in the direction intersecting with the rotation axis O of the steam turbine. Or a plurality of limiting members may be provided at predetermined intervals intermittently along a predetermined direction.

DESCRIPTION OF SYMBOLS 11 Turbine casing 22 Mounting flange part 23 Turbine mount 25 Fastening bolt 31,41 Restriction member 32,42 Fastening bolt 33,43 Attachment part 34,44 Vertical wall part 35,45 Horizontal wall part 36 Damper 51 Restriction member 52 Groove part 53 Resistance member 54 1st resistance plate 55 2nd resistance plate 56 Oil (damper)

Claims (8)

In the turbine casing in which the steam turbine supported by the gantry is covered from above and the outer peripheral flange portion is fixed to the gantry,
A restricting member for restricting movement of the turbine casing is disposed on the gantry.
A structure for supporting a turbine casing.   The turbine casing support structure according to claim 1, wherein the restricting member is positioned outside the flange portion and fixed to the frame.   The turbine casing support structure according to claim 2, wherein the limiting member is disposed in parallel with a rotation axis of the steam turbine.   4. The turbine casing support structure according to claim 2, wherein the restricting member is disposed with a predetermined amount of clearance from the flange portion. 5.   The support structure for a turbine casing according to claim 4, wherein a damper is interposed in the gap.   The limiting member is disposed between the groove formed on the upper surface of the gantry, a resistance member fixed to the lower portion of the turbine casing and disposed in the groove, and the groove and the resistance member. The turbine casing support structure according to claim 1, further comprising a damper.   The said resistance member has a 1st resistance board along a perpendicular direction, and a 2nd resistance board along a horizontal direction, The support structure of the turbine casing of Claim 6 characterized by the above-mentioned.   The support structure for a turbine casing according to any one of claims 1 to 7, wherein the limiting member limits the vertical movement and the horizontal movement of the turbine casing.

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