JP2007327448A - Cabin structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cabin structure capable of restraining or preventing leakage of fluid from a flange surface by restraint of oval deformation of a cabin and/or an increase in flange bearing pressure. <P>SOLUTION: This cabin structure is vertically divided into two parts of an upper cabin 11 and a lower cabin 12 by penetratingly inserting a rotor inside, and fastens respective divided surfaces as mutual connecting flange parts 11a and 12a by bolts, and is provided with a fluid leakage preventive means such as a peripheral directional rib 13 for preventing the fluid in the cabin from leaking to the outside by port opening of the flange surface in the mutual connecting flange parts. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a casing structure in a steam turbine, a gas turbine, a compressor thereof, and the like.

  An axial flow turbine machine such as a steam turbine, a gas turbine, and a compressor thereof is one in which a working fluid enters from an axial direction and exits in an axial direction, and is often used as a typical fluid machine. These general turbine casings are usually divided into two substantially symmetrically around the central axis of the rotor, and the upper casing and the lower casing are fastened by bolts at the respective upper and lower connecting flange portions. (See Patent Document 1).

JP 2001-271606 A

  However, the turbine casing as described above has the following problems. That is, the turbine casing is thermally expanded by the internal high-temperature gas, but the upper and lower connecting flange portions are cooled by the outside air temperature, so that the casing cross section is deformed into an oval shape. Due to this oval deformation, there is a possibility that an opening occurs in the flange surface of the upper and lower connecting flange portion, and the internal high-pressure gas leaks out of the passenger compartment.

  The leak of high-pressure gas is an important point to be prevented in design because it degrades the performance of the turbine. In the conventional technology, the structure of the high-pressure (high-temperature) gas does not leak by optimizing the arrangement of the flange bolts and applying an appropriate initial tightening force. Therefore, there is a concern that the flange surface pressure of the upper and lower connecting flange portions is insufficient. This problem is the same for both the steam turbine and the gas turbine, and not only in the casing of the turbine section but also in the casing of the compressor side of the gas turbine.

  Accordingly, an object of the present invention is to provide a vehicle cabin structure that can suppress or prevent fluid leakage from the flange surface by suppressing oval deformation of the vehicle cabin and / or increasing the flange surface pressure.

  The vehicle compartment structure according to the present invention for achieving the above object is configured as follows.

  (1) In the vehicle interior structure in which the rotor is inserted into the interior and divided into an upper compartment and a lower compartment, and the respective divided surfaces are fastened with bolts as connecting flange portions. The present invention is characterized in that a fluid leak preventing means is provided for preventing the fluid in the passenger compartment from leaking to the outside due to the opening of the flange surface in the connecting flange portion.

  (2) As a fluid leak preventing means, a plurality of circumferential ribs are provided on the outer surfaces of the upper and lower compartments.

  (3) As a fluid leak prevention means, fins are attached to the outer surfaces of the upper and lower casings, and the upper and lower casings are cooled by a fan based on the detected temperature data of the mutual connecting flange portions. It is characterized by that.

  (4) The fluid leakage prevention means is characterized in that a slit is provided from the outside located between the bolts in the mutual connection flange portion.

  (5) As a fluid leak preventing means, a plurality of non-through holes are formed in the mutual connecting flange portions from the flange side surfaces.

  (6) As a fluid leak preventing means, a plurality of non-through holes are formed in the mutual connecting flange portions in the vertical direction from the flange surface.

  (7) As a fluid leak preventing means, a member having a larger coefficient of thermal expansion than that of the mutual connection flange portion is sandwiched between the flange surfaces of the mutual connection flange portions.

  (8) As a means for preventing fluid leakage, a wire is wound around each outer surface of the upper and lower compartments, and tension is applied and tightened at the position of the mutual connection flange portion. .

  (9) As a fluid leak preventing means, a self-tightening lid is installed on the flange surface of the mutual connecting flange portion from the inside.

  (10) As a means for preventing fluid leakage, the connecting flange portions and the inclined holes that lead to the flange surface are provided in pairs in the vicinity thereof, and pre-tension is applied to the wires inserted across these inclined holes. It is characterized by providing the above.

  According to the vehicle casing structure according to the present invention, fluid leakage from the flange surface can be prevented by suppressing the oval deformation of the vehicle cabin and / or increasing the flange surface pressure, and the performance of the equipment such as turbine performance can be improved.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a vehicle compartment structure according to the present invention will be described in detail with reference to the drawings using embodiments.

  FIG. 1 is a schematic configuration diagram of a gas turbine to which a casing structure according to Embodiment 1 of the present invention is applied, and FIG. 2 is an explanatory diagram of the casing structure.

  As shown in FIG. 1, in the gas turbine 1, the air taken in from the air intake 2 is compressed by the compressor 3 and is sent to the combustor 4 as high-temperature / high-pressure compressed air. In the combustor 4, gas fuel such as natural gas or liquid fuel such as light oil or light heavy oil is supplied to the compressed air to burn the fuel, thereby generating high-temperature and high-pressure combustion gas as a working fluid. The high-temperature and high-pressure combustion gas is supplied to the turbine 5 to drive the turbine 5. The combustion gas that has finished flowing through the turbine 5 is discharged to the outside of the gas turbine 1.

  Therefore, the casing structure according to the present invention is applied to the compressor 3 and / or the turbine 5.

  That is, as shown in FIG. 2, in the case structure, a rotor (not shown) is inserted inside, and the upper case 11 and the lower case 12 pass through the center axis of the rotor in the vertical direction (even in the horizontal direction). It is divided into two, and each divided surface is fastened with a bolt (not shown) as a connection flange portion 11a, 12a.

  Then, as fluid leakage preventing means for preventing the fluid in the vehicle compartment from leaking to the outside due to the opening of the flange surface in the mutual connecting flange portions 11a, 12a, the outer peripheral surfaces of the upper and lower compartments 11a, 12a are surrounded. A plurality of directional ribs 13 are provided at predetermined intervals in the rotor axial direction.

  Due to such a configuration, the upper and lower casings 11 and 12 are oval-deformed by thermal expansion due to the internal high-temperature gas, and the high temperature is caused by the opening on the inner side of the flange surface in the mutual connection flange portions 11a and 12a. Even if there is a possibility that the gas leaks to the outside, in the present embodiment, it is effectively prevented by the above-described fluid leak preventing means.

  That is, by providing the circumferential ribs 13 on the outer surfaces of the upper and lower casings 11 and 12, the circumferential sectional rigidity of the casing is improved, and the casing shell portion is cooled by the fin effect to connect the connecting flanges to each other. The temperature difference between the portions 11a and 12a can be reduced and oval deformation can be suppressed.

  Thereby, opening of a mouth can be suppressed and leakage of high-temperature gas from the flange surface can be prevented, and the performance of equipment such as turbine performance can be improved.

  FIG. 3 is an explanatory view of a passenger compartment structure according to the second embodiment of the present invention.

  As a fluid leakage preventing means in the first embodiment, a plurality of fins 14 extending in the axial direction of the rotor are provided on the outer surfaces of the upper and lower casings 11 and 12, and the detected temperatures of the mutual connecting flange portions 11a and 12a are provided. In this example, the upper and lower casings 11 and 12 (chamber shell portions) are cooled by the fan 17 based on the data.

  In the illustrated example, a thermometer 15 is installed in the connection flange portions 11a and 12a mutually connected to the fin 14 portion, and the detected temperature is input to the control device 16 including a microcomputer or the like. The control device 16 controls the drive of the fan 17 so that the absolute value of the difference between the detected temperatures becomes small.

  According to this, as in the first embodiment, the casing shell portion can be cooled by the fin effect to reduce the temperature difference between the connecting flange portions 11a and 12a, and the oval deformation can be suppressed.

  FIG. 4 is an explanatory view of a passenger compartment structure according to Embodiment 3 of the present invention.

  As a fluid leak prevention means in the first embodiment, the bolts 11b and 12b are respectively engaged with the mutual connection flange portions 11a and 12a and a plurality of bolts for fastening the mutual connection flange portions 11a and 12a. In this example, a plurality of slits 18 are inserted from the outside.

  According to this, the rigidity of mutual connection flange part 11a, 12a can be reduced, the rigidity difference with a vehicle interior shell part (general part) can be reduced, and an oval deformation | transformation can be suppressed.

  FIG. 5 is an explanatory view of a passenger compartment structure according to a fourth embodiment of the present invention.

  This is a fluid leak prevention means in the first embodiment other than the bolt holes 11b and 12b in which a plurality of bolts for fastening the mutual connection flange portions 11a and 12a are respectively screwed to the mutual connection flange portions 11a and 12a. This is an example in which a plurality of non-through holes 11c and 12c are formed from the flange side surface.

  According to this, similarly to the third embodiment, the rigidity of the connecting flange portions 11a and 12a can be reduced to reduce the difference in rigidity from the vehicle interior shell portion (general portion), thereby suppressing the oval deformation. .

  FIG. 6 is an explanatory diagram of a passenger compartment structure according to the fifth embodiment of the present invention.

  This is a fluid leak prevention means in the first embodiment other than the bolt holes 11b and 12b in which a plurality of bolts for fastening the mutual connection flange portions 11a and 12a are respectively screwed to the mutual connection flange portions 11a and 12a. This is an example in which a plurality of non-through holes 11d and 12d are formed in the vertical direction from the flange surface.

  According to this, similarly to the third embodiment, the rigidity of the connecting flange portions 11a and 12a can be reduced to reduce the difference in rigidity from the vehicle interior shell portion (general portion), thereby suppressing the oval deformation. . Further, in this embodiment, since the contact area of the flange surface can be reduced, it becomes possible to increase the flange surface pressure with the same bolt tightening force, and in combination with the above-described oval deformation suppression effect, It is possible to prevent the leakage of high temperature gas from the flange surface by suppressing the opening of the layer further.

  FIG. 7 is an explanatory view of a passenger compartment structure according to Embodiment 6 of the present invention.

  As a fluid leakage prevention means in the first embodiment, the block-shaped high expansion material 19 having a larger coefficient of thermal expansion than the mutual connection flange portions 11a and 12a is sandwiched between the flange surfaces of the mutual connection flange portions 11a and 12a. This is an example.

  According to this, when the temperature becomes high during operation, the high expansion material 19 thermally expands larger than the mutual connection flange portions 11a and 12a, so even if the mouth opening occurs due to oval deformation, the surface of the flange surface A sufficient pressure can be secured to maintain the sealing performance, and the leakage of hot gas from the flange surface can be prevented.

  FIG. 8 is an explanatory view of a passenger compartment structure according to a seventh embodiment of the present invention.

  This is an example in which self-tightening lids 21 having a wedge function are installed on the flange surfaces of the mutual connection flange portions 11a and 12a as fluid leak prevention means in the first embodiment.

  According to this, when pressure is applied from the inside of the vehicle interior, the self-tightening lid 21 acts in the direction of positively contacting the flange surface, so even if the mouth opening occurs due to oval deformation, the flange surface The surface pressure can be sufficiently secured to maintain the sealing performance, and the leakage of high temperature gas from the flange surface can be prevented.

  FIG. 9 is an explanatory view of a passenger compartment structure according to an eighth embodiment of the present invention.

  As a fluid leak prevention means in the first embodiment, the wires 20a and 20b are wound around the outer surfaces of the upper and lower casings 11 and 12 over a plurality of locations in the rotor axial direction (coiled). This is an example in which tension is applied at the positions of the connecting flange portions 11a and 12a and tightened.

  According to this, the passenger compartment to be deformed by thermal deformation can be forcibly held in a perfect circle by the wires 20a and 20b, and the opening of the mouth can be suppressed to prevent leakage of high temperature gas from the flange surface. can do.

  FIG. 10 is an explanatory view of a passenger compartment structure according to the ninth embodiment of the present invention.

  As a fluid leak prevention means in the first embodiment, the rotor axial direction is such that the slant holes 11e and 12e communicating with the flange surface are paired in the vertical direction over the connecting flange portions 11a and 12a and the vicinity thereof. This is an example in which pre-tension is applied to the wire 22 inserted across the upper and lower oblique holes 11e and 12e.

  According to this, the opening on the flange surface side of the oblique holes 11e, 12e is opened as close as possible to the vicinity of the vehicle interior surface, so that the wire 22 is provided in the vicinity of the vehicle interior surface where bolt installation was impossible in the past. A surface pressure can be applied, and the opening due to the oval deformation can be suppressed to prevent leakage of high temperature gas from the flange surface.

  Needless to say, the present invention is not limited to the above-described embodiments, and various modifications such as combining several embodiments are possible without departing from the scope of the present invention.

1 is a schematic configuration diagram of a gas turbine to which a casing structure according to a first embodiment of the present invention is applied. It is explanatory drawing of a vehicle interior structure similarly. It is explanatory drawing of the compartment structure which concerns on Example 2 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 3 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 4 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 5 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 6 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 7 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 8 of this invention. It is explanatory drawing of the compartment structure which concerns on Example 9 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Gas turbine, 2 Air intake port, 3 Compressor, 4 Combustor, 5 Turbine, 11 Upper compartment, 11a Connection flange part, 11b Bolt hole, 11c Non-through hole, 11d Non-through hole, 11e Oblique hole, 12 Lower part Car compartment, 12a Connection flange, 12b Bolt hole, 12c Non-through hole, 12d Non-through hole, 12e Oblique hole, 13 Circumferential rib, 14 Fin, 15 Thermometer, 16 Control device, 17 Fan, 18 Slit, 19 High Inflatable material, 20a, 20b wire, 21 self-tightening lid, 22 wire.

Claims (10)

  In the vehicle interior structure in which the rotor is inserted into the interior and divided into upper and lower casings and divided into upper and lower casings, and the respective divided surfaces are fastened with bolts as mutual connecting flange portions, the mutual connecting flanges A vehicle interior structure comprising fluid leakage prevention means for preventing fluid in the vehicle interior from leaking to the outside due to opening of a flange surface in the section.   2. The vehicle compartment structure according to claim 1, wherein a plurality of circumferential ribs are provided on the outer surfaces of the upper and lower compartments as the fluid leak prevention means.   As the fluid leakage prevention means, fins are attached to the outer surfaces of the upper and lower casings, and the upper and lower casings are cooled by a fan based on the detected temperature data of the mutual connecting flange portions. The vehicle compartment structure according to claim 1.   The vehicle interior structure according to claim 1, wherein the fluid leakage preventing means includes a slit formed in the mutual connecting flange portion between the bolts from the outside.   The vehicle interior structure according to claim 1, wherein a plurality of non-through holes are formed in the mutual connection flange portions from the side surfaces of the flanges as the fluid leak prevention means.   The vehicle interior structure according to claim 1, wherein the fluid leakage preventing means includes a plurality of non-through holes formed in the mutual connecting flange portions in a vertical direction from the flange surface.   The vehicle interior structure according to claim 1, wherein a member having a larger coefficient of thermal expansion than the mutual connection flange portion is sandwiched between the flange surfaces of the mutual connection flange portions as the fluid leak preventing means.   The said fluid leak preventing means is characterized in that a wire is wound around each outer surface of the upper and lower casings, and tension is applied and tightened at the position of the mutual connecting flange portion. The vehicle compartment structure according to 1.   2. The vehicle interior structure according to claim 1, wherein a self-tightening lid is installed on the flange surface of the mutual connection flange portion from the inside as the fluid leak prevention means.   As the fluid leak prevention means, a pair of oblique holes that lead to the flange surface are provided in the vicinity of the mutual connecting flange portions, and pre-tension is applied to the wires inserted across these oblique holes. The vehicle interior structure according to claim 1, wherein:

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