JP2014114748A - Gas turbine engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas turbine engine which is highly productive and manufactured at a low cost.SOLUTION: A gas turbine engine 100 comprises: a compressor 1 which compresses air through rotation thereof; a combustor 2 which burns fuel with a supply of compressed air sent from the compressor 1; and a turbine 3 which rotates by receiving combustion gas sent out from the combustor 2. The gas turbine engine also has an axial diffuser 52 (152) which converts velocity energy of the compressed air sent out from the compressor 1 into pressure energy and guides the same to the combustor 2 after directing a compressed air flow. The axial diffuser 52 (152) has irregularities formed by bending a plate material as guide passages 52p of the compressed air.

Description

  The present invention relates to gas turbine engine technology.

  Conventionally, a compressor that compresses air by rotating, a combustor that supplies and burns fuel to the compressed air that is sent out from the compressor, and a turbine that receives and rotates the combustion gas sent from the combustor Are known (for example, refer to Patent Document 1). Such a gas turbine engine includes an axial diffuser that converts the velocity energy of compressed air sent from the compressor into pressure energy and regulates the flow of the compressed air to guide it to the combustor.

  By the way, in the production process of an axial diffuser, cutting is performed on an object to be cut formed by a precision casting method using an NC (Numerical Control) machine tool. Further, depending on the structure of the axial diffuser, welding may be performed. For this reason, such an axial diffuser has a problem of low productivity and high production cost. Therefore, the gas turbine engine equipped with such an axial diffuser has a problem that productivity is low and production cost is high.

JP 2010-281257 A

  An object of the present invention is to provide a gas turbine engine with high productivity and reduced production cost.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, the invention according to claim 1
A compressor that compresses air by rotating;
A combustor for supplying fuel to the compressed air sent from the compressor and burning it;
A gas turbine engine configured to receive and rotate combustion gas sent from the combustor,
An axial diffuser for converting the velocity energy of the compressed air sent out from the compressor into pressure energy and arranging the flow of the compressed air to guide the combustor;
In the axial diffuser, unevenness formed by bending a plate material is used as a guide passage for compressed air.

The invention according to claim 2 is the gas turbine engine according to claim 1,
The axial diffuser is configured such that a blade row is formed by the uneven side plate portions arranged radially by making the plate material annular.

The invention according to claim 3 is the gas turbine engine according to claim 1 or 2,
Parts such as a hub arranged on the inner peripheral side of the axial diffuser;
An inner ring attached to a component such as the hub,
The axial diffuser is fitted so that the concave and convex inner plate portions arranged in the circumferential direction are in contact with the outer periphery of the inner ring by making the plate material annular.

The invention according to claim 4 is the gas turbine engine according to claim 1 or 2,
Components such as a main casing disposed on the outer peripheral side of the axial diffuser;
An outer ring attached to a component such as the main casing,
The axial diffuser is fitted so that the uneven outer plate portion arranged in the circumferential direction is in contact with the inner periphery of the outer ring by making the plate member annular.

The invention according to claim 5 is the gas turbine engine according to any one of claims 1 to 4,
The axial diffuser is formed by bending the plate material with a pair of formed gears rotating in opposite directions.

The invention according to claim 6 is the gas turbine engine according to claim 5,
The axial diffuser is formed by the forming gear having a curved tooth surface based on an involute curve.

  As effects of the present invention, the following effects can be obtained.

  According to the first to sixth aspects of the invention, the productivity of the axial diffuser can be improved and the production cost can be reduced. Therefore, it is possible to improve the productivity of the gas turbine engine provided with such an axial diffuser and reduce the production cost.

The figure which shows the structure of a gas turbine engine. The figure which shows the cold section of a gas turbine engine. The figure which shows the hot section of a gas turbine engine. The figure which shows a diffuser. The figure which shows the axial diffuser which concerns on 1st embodiment. The figure which shows the attachment structure of the axial diffuser using an inner ring. The figure which shows the attachment structure of the axial diffuser using an outer ring. The figure which shows the attachment structure of the axial diffuser by an inside stay. The figure which shows the attachment structure of the axial diffuser by an outside stay. The figure which shows other attachment structures. The figure which shows the axial diffuser which concerns on 2nd embodiment. The figure which shows the axial diffuser which concerns on 3rd embodiment. The figure which shows the axial diffuser which concerns on 4th embodiment. The figure which shows the axial diffuser which concerns on 5th embodiment. The figure which shows the notes on the design of an axial diffuser. The figure which shows the notes on the design of an axial diffuser. The figure which shows the notes on the design of an axial diffuser. The figure which shows the manufacturing apparatus which concerns on 1st embodiment. The figure which shows the manufacturing apparatus which concerns on 2nd embodiment. The figure which shows the manufacturing apparatus which concerns on 3rd embodiment. The figure which shows the other distortion countermeasures. The figure which shows the cutting method in a production process.

  First, the gas turbine engine 100 will be briefly described.

  FIG. 1 is a diagram illustrating a configuration of a gas turbine engine 100. FIG. 2 shows a cold section Cs of the gas turbine engine 100, and FIG. 3 shows a hot section Hs. In addition, arrow Ac in a figure has shown the flow of the air in the cold section Cs. An arrow Ah in the figure indicates the flow of air (combustion gas) in the hot section Hs.

  The gas turbine engine is a so-called speed type internal combustion engine. The gas turbine engine 100 mainly includes a compressor 1, a combustor 2, and a turbine 3. The gas turbine engine 100 includes an exhaust nozzle 4, a speed reducer and a power generator (not shown).

  The compressor 1 compresses air by rotating. The compressor 1 includes a plurality of impellers 11 formed in a spiral shape in the circumferential direction of the rotation axis L. The compressor 1 rotates about the rotation axis L, and each impeller 11 compresses the air by blocking the air. The compressor 1 in the gas turbine engine 100 compresses air supplied in parallel to the rotation axis L, and sends the compressed air perpendicular to the rotation axis L.

  The combustor 2 supplies fuel to the compressed air sent from the compressor 1 and burns it. The combustor 2 includes a liner 23 in which a fuel injection nozzle 22 is attached inside the combustor outer cylinder 21. The combustor 2 guides the compressed air from the air hole 23 h of the liner 23 to the inside of the liner 23 by the combustor outer cylinder 21. And the combustor 2 burns this fuel, when the fuel injection nozzle 22 supplies fuel. The combustor 2 in the gas turbine engine 100 includes a tail cylinder 24 that guides the combustion gas downstream of the liner 23, and sends the combustion gas in parallel to the rotation axis L.

  The turbine 3 rotates by receiving the combustion gas sent out from the combustor 2. In the gas turbine engine 100, the turbine 3 includes a high pressure turbine 31 and a low pressure turbine 32. The high-pressure turbine 31 includes a plurality of blades 311 that form a predetermined angle with respect to the rotation axis L in the circumferential direction of the rotation axis L. The low-pressure turbine 32 also includes a plurality of blades 321 that form a predetermined angle with respect to the rotation axis L in the circumferential direction of the rotation axis L. The high-pressure turbine 31 and the low-pressure turbine 32 receive the combustion gas at the blades 311 and 321 and rotate around the rotation axis L. The turbine 3 in the gas turbine engine 100 rotates the compressor 1 and rotates the quill shaft 12 connected to the compressor 1. The quill shaft 12 drives the power generator via a speed reducer (not shown).

  As described above, the gas turbine engine 100 can continuously compress air, burn fuel, and obtain rotational power. And the gas turbine engine 100 drives a power generator using the rotational power obtained continuously. The gas turbine engine 100 has a specification that uses liquid fuel such as light oil, but may have a specification that uses gaseous fuel such as natural gas. The gas turbine engine 100 is a so-called uniaxial gas turbine engine, but may be a biaxial gas turbine engine.

  Below, the diffuser 5 which this gas turbine engine 100 employ | adopts is demonstrated.

  FIG. 4 is a view showing the diffuser 5. In addition, arrow Ac in a figure has shown the flow of the air which passes the diffuser 5. FIG.

  The diffuser 5 includes a radial diffuser 51 and an axial diffuser 52. The radial diffuser 51 guides the compressed air sent out by the compressor 1 to the axial diffuser 52. The axial diffuser 52 guides the compressed air guided by the radial diffuser 51 to the combustor 2. At this time, the radial diffuser 51 and the axial diffuser 52 convert the velocity energy of the compressed air into pressure energy and adjust the flow of the compressed air.

  First, the radial diffuser 51 will be briefly described. In the radial diffuser 51, a plurality of guide passages 51p are formed radially. The passage area of the guide passage 51p gradually increases along the flow of compressed air. Therefore, the flow rate of the compressed air flowing through the guide passage 51p decreases as the passage area increases, and the pressure gradually increases. Furthermore, the guide passage 51p suppresses the flow in the turning direction accompanying the rotation of the compressor 1. Thus, the radial diffuser 51 converts the velocity energy of the compressed air into pressure energy and adjusts the flow of the compressed air.

  Next, the axial diffuser 52 will be briefly described. A plurality of guide passages 52p are formed in the axial diffuser 52 in a spiral shape. The passage area of the guide passage 52p gradually increases along the flow of compressed air. Accordingly, the flow rate of the compressed air flowing through the guide passage 52p decreases as the passage area increases, and the pressure gradually increases. Furthermore, the guide passage 52p suppresses the flow in the turning direction accompanying the rotation of the compressor 1. Thus, the axial diffuser 52 converts the velocity energy of the compressed air into pressure energy and adjusts the flow of the compressed air.

  The axial diffuser 52 according to the first embodiment (hereinafter referred to as “axial diffuser 152”) will be described in detail below.

  FIG. 5 is a view showing the axial diffuser 152 according to the first embodiment. FIG. 5A is a perspective view of the axial diffuser 152. 5B is a diagram of the axial diffuser 152 viewed from the direction of the arrow X, and FIG. 5C is a diagram viewed from the direction of the arrow Y.

  The axial diffuser 152 has a concave / convex 52U formed by bending a plate material as a compressed air guide passage 52p. More specifically, in the axial diffuser 152, the compressed air guide passage 52p is formed on the outer side of the concave portion and the inner side of the convex portion of the concave and convex portions 52U formed by bending the plate material. In the present embodiment, the axial diffuser 152 is formed by annularly forming a single plate material on which a plurality of irregularities 52U are formed. However, a plurality of plate materials on which the unevenness 52U is formed may be combined to form an annular shape.

  The unevenness 52U is formed in a substantially rectangular shape when viewed from the direction of the arrow X. Therefore, the adjacent irregularities 52U have a shape in which the inner plate portion 52i and the outer plate portion 52o are connected by the side plate portion 52s. Thus, the axial diffuser 152 forms a blade row by the side plate portions 52s of the unevenness 52U arranged radially.

  The unevenness 52U gradually changes in phase (angle in the circumferential direction) from the inlet side end portion to the outlet side end portion of the compressed air. That is, the unevenness 52U is formed to be twisted about the rotation axis L. Therefore, the guide passage 52p is formed in the axial diffuser 152 in a spiral shape. In the present embodiment, the side plate portion 52s is a curved surface based on an involute curve (see the two-dot chain line CL in FIG. 5B) from the inner plate portion 52i to the outer plate portion 52o. The reason for this will be described later.

  Next, the attachment structure of the axial diffuser 152 will be described.

  FIG. 6 is a view showing a mounting structure of the axial diffuser 152 using the inner ring 53. FIG. 7 is a view showing a mounting structure of the axial diffuser 152 using the outer ring 54.

  First, the attachment structure of the axial diffuser 152 using the inner ring 53 will be described. The axial diffuser 152 is attached to the hub 55 existing on the inner peripheral side of the axial diffuser 152 via the inner ring 53. The hub 55 is a part constituting a part of a passage through which compressed air flows. Below, this attachment structure is demonstrated concretely.

  The inner ring 53 is an annular part. The axial diffuser 152 is fitted so that the inner plate portion 52 i of the unevenness 52 U arranged in the circumferential direction is in contact with the outer periphery of the inner ring 53. Then, the inner ring 53 in a state where the axial diffuser 152 is fitted is fixed to the hub 55 by the bolt B. Thereby, a simple and highly reliable mounting structure of the axial diffuser 152 is realized. A positioning pin may be used so that the axial diffuser 152 does not move due to the flow of compressed air. Further, the axial diffuser 152 may be welded to the inner ring 53.

  Next, the attachment structure of the axial diffuser 152 using the outer ring 54 will be described. The axial diffuser 152 is attached to the main casing 56 existing on the outer peripheral side of the axial diffuser 152 via the outer ring 54. The main casing 56 is a part constituting a part of a passage through which compressed air flows. Below, this attachment structure is demonstrated concretely.

  The outer ring 54 is a part formed in an annular shape. The axial diffuser 152 is fitted so that the outer plate portion 52o of the unevenness 52U arranged in the circumferential direction is in contact with the inner periphery of the outer ring 54. The outer ring 54 in which the axial diffuser 152 is fitted is fixed to the main casing 56 by the bolt B. Thereby, a simple and highly reliable mounting structure of the axial diffuser 152 is realized. A positioning pin may be used so that the axial diffuser 152 does not move due to the flow of compressed air. Further, the axial diffuser 152 may be welded to the outer ring 54.

  Furthermore, in this mounting structure, the outer ring 54 can be fixed to the support structure 57 to which the main casing 56 is attached, instead of being fixed to the main casing 56. 10A, the flange portion 54e of the outer ring 54 may be sandwiched between a main casing 56 and a support structure 57, and fixed with bolts or positioning pins for attaching the main casing 56 to the support structure 57. That is, when the main casing 56 is attached to the support structure 57, the flange portion 54e of the outer ring 54 is fastened together.

  Next, a mounting structure of the axial diffuser 152 that does not use the inner ring 53 or the outer ring 54 will be described.

  FIG. 8 is a view showing a mounting structure of the axial diffuser 152 by the inside stay. FIG. 9 is a view showing a mounting structure of the axial diffuser 152 by the outside stay.

  First, the attachment structure of the axial diffuser 152 by the inside stay will be described. The axial diffuser 152 is attached to the hub 55 via a stay (inside stay) provided on the axial diffuser 152. Below, this attachment structure is demonstrated concretely.

  In the axial diffuser 152 corresponding to the mounting structure, the inner plate portion 52i of the uneven portion 52U is extended, and the extended portion is bent in the inner circumferential direction. In the axial diffuser 152, a portion 52 e bent in the inner circumferential direction is fixed to the hub 55 by a bolt B. That is, the axial diffuser 152 uses the portion 52e bent in the inner circumferential direction as a stay (inside stay). Thereby, a simple mounting structure of the axial diffuser 152 is realized. In this mounting structure, the axial diffuser 152 does not move due to the flow of compressed air, so there is no need to use a positioning pin or the like.

  Next, the attachment structure of the axial diffuser 152 by the outside stay will be described. The axial diffuser 152 is attached to the main casing 56 via a stay (outside stay) provided on the axial diffuser 152. Below, this attachment structure is demonstrated concretely.

  In the axial diffuser 152 corresponding to this mounting structure, the outer plate portion 52o of the unevenness 52U is extended, and the extended portion is bent in the outer peripheral direction. In the axial diffuser 152, a portion 52 e bent in the outer circumferential direction is fixed to the main casing 56 with a bolt B. That is, the axial diffuser 152 uses the portion 52e bent in the outer circumferential direction as a stay (outside stay). Thereby, a simple mounting structure of the axial diffuser 152 is realized. In this mounting structure, the axial diffuser 152 does not move due to the flow of compressed air, so there is no need to use a positioning pin or the like.

  Furthermore, in such an attachment structure, the axial diffuser 152 can be fixed to the support structure 57 to which the main casing 56 is attached, instead of being fixed to the main casing 56. Further, as shown in FIG. 10B, a portion 52e bent in the outer peripheral direction of the axial diffuser 152 is sandwiched between the main casing 56 and the support structure 57, and fixed with bolts or positioning pins for attaching the main casing 56 to the support structure 57. It is also good. That is, when the main casing 56 is attached to the support structure 57, the portion 52e bent in the outer peripheral direction of the axial diffuser 152 is fastened together.

  Hereinafter, the axial diffuser 52 (hereinafter referred to as “axial diffuser 252”) according to the second embodiment will be described in detail.

  FIG. 11 is a diagram showing an axial diffuser 252 according to the second embodiment. FIG. 11A is a perspective view of the axial diffuser 252. 11B is a view of the axial diffuser 252 viewed from the direction of the arrow X, and FIG. 11C is a view of the axial diffuser 252 viewed from the direction of the arrow Y.

  The axial diffuser 252 has a compressed air guide passage 52p between a wall surface 52W formed by bending a plate material and the wall surface 52W. More specifically, the axial diffuser 252 has a compressed air guide passage 52p between the wall surface 52W formed by bending the plate material and the wall surface 52W formed by bending the plate material. In the present embodiment, the axial diffuser 252 is formed by annularly forming a single plate material on which a plurality of wall surfaces 52W are formed. However, a plurality of plate members on which the wall surface 52W is formed may be combined to form an annular shape.

  The wall surface 52W is formed by causing a portion surrounded by the cut line 52c of the plate material along the cut line 52c and bending the plate material. For this reason, the wall surface 52W has the same shape as the portion surrounded by the cut line 52c. Thus, the axial diffuser 252 constitutes a blade row by the radially arranged wall surfaces 52W.

  The wall surface 52W gradually changes in phase (angle in the circumferential direction) from the inlet side end portion to the outlet side end portion of the compressed air. That is, the wall surface 52W is formed to be twisted about the rotation axis L. For this reason, the guide passage 52p is formed in the axial diffuser 252 in a spiral shape.

  Such an axial diffuser 252 can be attached to the hub 55 using the inner ring 53 (see FIG. 6). Further, the portion 52e bent in the inner peripheral direction of the axial diffuser 252 may be fixed to the hub 55 (see FIG. 8). However, a method of attaching to the main casing 56 or the like using the outer ring 54 or a method of fixing the portion 52e bent in the outer peripheral direction of the axial diffuser 252 to the main casing 56 or the like is considered to be difficult (FIG. 7, FIG. 9). Also, it is considered difficult to fasten the flange portion 54e of the outer ring 54 together with the main casing 56 and the support structure 57 or to fasten the portion 52e bent in the outer peripheral direction of the axial diffuser 252 (FIG. 10A, see FIG. 10B).

  Hereinafter, the axial diffuser 52 (hereinafter referred to as “axial diffuser 352”) according to the third embodiment will be described in detail.

  FIG. 12 is a view showing an axial diffuser 352 according to the third embodiment. FIG. 12A is a perspective view of the axial diffuser 352. 12B is a diagram of the axial diffuser 352 viewed from the direction of the arrow X, and FIG. 12C is a diagram viewed from the direction of the arrow Y.

  The axial diffuser 352 has a compressed air guide passage 52p between a wall surface 52W formed by bending a plate material and the wall surface 52W. That is, the basic design concept is the same as that of the axial diffuser 252 according to the second embodiment.

  The wall surface 52W is formed by causing a portion surrounded by the cut line 52c of the plate material along the cut line 52c and bending the plate material. In this embodiment, the front edge portion of the plate material is extended, and this extended portion is also caused. For this reason, the wall surface 52W includes a main wing portion 52Wm that is a portion surrounded by a cut line 52c and a front wing portion 52Wf that is an extended portion of a plate material.

  The wall surface 52W gradually changes in phase (angle in the circumferential direction) from the inlet side end portion to the outlet side end portion of the compressed air. That is, the main wing part 52Wm and the front wing part 52Wf constituting the wall surface 52W are formed to be twisted about the rotation axis L. Therefore, the guide passage 52p is formed in the axial diffuser 352 in a spiral shape.

  Such an axial diffuser 352 can be attached to the hub 55 using the inner ring 53 (see FIG. 6). Further, the portion 52e bent in the inner peripheral direction of the axial diffuser 352 may be fixed to the hub 55 (see FIG. 8). However, a method of attaching to the main casing 56 or the like using the outer ring 54 or a method of fixing the portion 52e bent in the outer peripheral direction of the axial diffuser 352 to the main casing 56 or the like is considered to be difficult (FIGS. 7 and 7). 9). Also, it is considered difficult to fasten the flange portion 54e of the outer ring 54 together with the main casing 56 and the support structure 57 or to fasten the portion 52e bent in the outer peripheral direction of the axial diffuser 352 (FIG. 10A, see FIG. 10B).

  This axial diffuser 352 is extended to the vicinity of the rear edge of the radial diffuser 51 by a front wing portion 52Wf constituting the wall surface 52W. As a result, the axial diffuser 352 has a longer guide passage 52p for compressed air, so that the performance as a diffuser is improved by converting the velocity energy of the compressed air into pressure energy and adjusting the flow of the compressed air.

  As described above, the wall surface 52W is formed by causing a portion surrounded by the cut line 52c of the plate material and a portion where the front edge portion of the plate material is extended. However, the side plate portion 52s of the unevenness 52U formed by bending the plate material may be extended to form the front wing portion 52Wf. That is, this design concept can also be applied to the axial diffuser 152 according to the first embodiment. In this case, all of the mounting structures for the axial diffuser 352 described above can be applied.

  The axial diffuser 52 (hereinafter referred to as “axial diffuser 452”) according to the fourth embodiment will be described in detail below.

  FIG. 13 is a diagram showing an axial diffuser 452 according to the fourth embodiment. FIG. 13A is a perspective view of the axial diffuser 452. 13B is a view of the axial diffuser 452 viewed from the direction of the arrow X, and FIG. 13C is a view of the axial diffuser 452 viewed from the direction of the arrow Y.

  The axial diffuser 452 has a compressed air guide passage 52p between a wall surface 52W formed by bending a plate material and the wall surface 52W. That is, the basic design concept is the same as the axial diffuser 252 according to the second embodiment and the axial diffuser 352 according to the third embodiment.

  The wall surface 52W is formed by causing a portion surrounded by the cut line 52ca of the plate material along the cut line 52ca and bending the plate material. In the present embodiment, a cut line 52cb is provided in a portion surrounded by the cut line 52ca, and both sides separated by the cut line 52cb are caused. Therefore, the wall surface 52W includes a main wing part 52Wm formed by one side divided by a cut line 52cb and a front wing part 52Wf formed by the other side divided by the cut line 52cb.

  The wall surface 52W gradually changes in phase (angle in the circumferential direction) from the inlet side end portion to the outlet side end portion of the compressed air. That is, the main wing part 52Wm and the front wing part 52Wf constituting the wall surface 52W are formed to be twisted about the rotation axis L. For this reason, the guide passage 52p is formed in the axial diffuser 452 in a spiral shape.

  Such an axial diffuser 452 can be attached to the hub 55 using the inner ring 53 (see FIG. 6). Further, the portion 52e bent in the inner peripheral direction of the axial diffuser 452 may be fixed to the hub 55 (see FIG. 8). However, a method of attaching to the main casing 56 or the like using the outer ring 54 or a method of fixing the portion 52e bent in the outer peripheral direction of the axial diffuser 452 to the main casing 56 or the like is considered difficult (FIGS. 7 and 7). 9). Also, it is considered difficult to fasten the flange portion 54e of the outer ring 54 together with the main casing 56 and the support structure 57 or to fasten the portion 52e bent in the outer peripheral direction of the axial diffuser 452 (FIG. 10A, see FIG. 10B).

  The axial diffuser 452 has a gap (slit) between the main wing part 52Wm and the front wing part 52Wf constituting the wall surface 52W. Thereby, the axial diffuser 452 can absorb the distortion at the time of bending the plate material to form the wall surface 52W. Further, the axial diffuser 452 is arranged with the main wing portion 52Wm shifted from the wing back side of the front wing portion 52Wf in consideration of the shape of the cut lines 52ca and 52cb. As a result, the axial diffuser 452 can prevent rapid performance deterioration because the main wing portion 52Wm is disposed in the separation region even if separation occurs in the flow of compressed air on the blade back side of the front wing portion 52Wf. .

  As described above, the wall surface 52W is surrounded by the cut line 52ca of the plate material, and is formed by causing one side partitioned by the cut line 52cb and the other side partitioned by the cut line 52cb. However, a cut line may be provided in the side plate portion 52s of the unevenness 52U formed by bending the plate material to constitute the main wing portion 52Wm and the front wing portion 52Wf. That is, this design concept can also be applied to the axial diffuser 152 according to the first embodiment. In this case, all of the mounting structures for the axial diffuser 352 described above can be applied.

  The axial diffuser 52 according to the fifth embodiment (hereinafter referred to as “axial diffuser 552”) will be described in detail below.

  FIG. 14 is a diagram showing an axial diffuser 552 according to the fifth embodiment. FIG. 14A is a perspective view of the axial diffuser 552. 14B is a diagram of the axial diffuser 552 viewed from the direction of the arrow X, and FIG. 14C is a diagram viewed from the direction of the arrow Y. 14D is a cross-sectional view showing the attachment structure of the blade 521.

  The axial diffuser 552 is provided with a separately created blade 521, and a space between the blade 521 and the blade 521 serves as a guide passage 52p for compressed air. This is different in basic design concept from the axial diffusers 152, 252, 352, and 452 described above.

  The blade 521 is formed by a so-called press punching method. The blade 521 is fixed by crushing the base 521t in a state where the protrusion 521t provided on the base is inserted into the mounting hole 52rh of the ring 52r.

  The blade 521 gradually changes in phase (angle in the circumferential direction) from the inlet side end portion to the outlet side end portion of the compressed air. That is, the blade 521 is formed to be twisted about the rotation axis L. For this reason, the guide passage 52p is formed in the axial diffuser 552 in a spiral shape.

  Such an axial diffuser 552 can be attached to the hub 55 using the inner ring 53 (see FIG. 6). Further, the portion 52e bent in the inner peripheral direction of the axial diffuser 552 may be fixed to the hub 55 (see FIG. 8). However, a method of attaching to the main casing 56 or the like using the outer ring 54 or a method of fixing the portion 52e bent in the outer peripheral direction of the axial diffuser 552 to the main casing 56 or the like is considered difficult (FIGS. 7 and 7). 9). In addition, it is considered difficult to fasten the flange portion 54e of the outer ring 54 together with the main casing 56 and the support structure 57 or to fasten the portion 52e bent in the outer peripheral direction of the axial diffuser 552 (FIG. 10A, see FIG. 10B).

  The axial diffuser 552 is completed by attaching a separately created blade 521. Thereby, since the axial diffuser 552 has the blade 521 formed with high accuracy, the performance as a diffuser that converts the velocity energy of the compressed air into pressure energy and adjusts the flow of the compressed air is improved. In addition, the axial diffuser 552 is easy to replace the blade 521 and has improved maintainability.

  Hereinafter, considerations in designing the axial diffuser 52 will be described.

  Here, considerations of the axial diffuser 152 according to the first embodiment will be described.

  FIG. 15 is a diagram illustrating design considerations for the axial diffuser 152. FIG. 15A is a diagram illustrating a state in which the unevenness 52U is formed on the plate material, and FIG. 15B is a diagram illustrating a state in which the plate material is annular.

  When the plate material on which the unevenness 52U is formed is viewed from the direction of the arrow X, it is required that the adjacent side plate portions 52s do not overlap each other. In other words, when light is applied from the direction of the arrow X to the plate material on which the unevenness 52U is formed, it is required that the projection regions S of the adjacent side plate portions 52s do not overlap each other. When this precaution is satisfied, a part of the inner plate portion 52i becomes a bending margin portion R having low rigidity, and thus the plate material can be easily formed into an annular shape. However, even if the design does not satisfy this consideration, it is sufficient if the plate material can be formed into an annular shape.

  Furthermore, by making the outer plate portion 52o of the uneven portion 52U longer (by increasing the length of the plate in the longitudinal direction), a portion of the outer plate portion 52o is made a bending margin portion R having low rigidity. Is also possible (not shown).

  Next, in order for the axial diffuser 152 to exhibit the target performance, a case where the adjacent side plate portions 52s must overlap each other will be described.

  FIG. 16 is a diagram illustrating design considerations for the axial diffuser 152. FIG. 16A is a diagram illustrating a state in which the unevenness 52U is formed on the plate material, and FIG. 16B is a diagram illustrating a state in which the plate material is annular.

  Assuming an imaginary line Ls that is parallel to the central axis L when the plate is annular, a notch 52L is formed on the front edge side so as to intersect with an imaginary line Ls that passes near the rear edge of the side plate portion 52s. It is required to provide. When this precaution is satisfied, a part of the inner plate portion 52i becomes a bending margin portion R having low rigidity, and thus the plate material can be easily formed into an annular shape. However, even if the design does not satisfy this consideration, it is sufficient if the plate material can be formed into an annular shape.

  Furthermore, by providing a notch 52L on the rear edge side so as to intersect with a virtual line Ls passing through the vicinity of the front edge of the side plate portion 52s, a part of the inner plate portion 52i is made a bending margin portion R having low rigidity. Is also possible (not shown).

  Next, in order for the axial diffuser 152 to exhibit the target performance, a case where the height dimension of the rear edge portion must be lower than the height dimension of the front edge portion of the side plate portion 52s will be described.

  FIG. 17 is a diagram illustrating design considerations for the axial diffuser 152. 17A and 17B are schematic views of the axial diffuser 152. FIG.

The height dimension of the front edge part and the rear edge part of the side plate portion 52s are required to satisfy the following formula F1. Hereinafter, the height dimension of the front edge portion of the side plate portion 52s is defined as h1, and the height dimension of the rear edge portion is defined as h2. Further, the pitch diameter of the front edge portion is defined as D1, and the pitch diameter of the rear edge portion is defined as D2. N represents the number of side plate portions 52s. This leads to the following formula:
Entrance side circumference: π (D1 + h1) / 2 + π (D1−h1) / 2 + Nh1 = πD1 + Nh1
Exit side circumference: π (D2 + h2) / 2 + π (D2−h2) / 2 + Nh2 = πD2 + Nh2
Here, since the axial diffuser 152 is formed by annularly forming the plate material on which the unevenness 52U is formed, the inlet-side circumferential length and the outlet-side circumferential length are equal. Thus, the above mathematical formula can be converted as follows.
Formula F1: N (h1−h2) −π (D2−D1) = 0

Further, when the outer diameters of the front edge portion and the rear edge portion of the side plate portion 52s are equal to D3, it is required to satisfy the following formula F2. Hereinafter, the height dimension of the front edge portion of the side plate portion 52s is defined as h1, and the height dimension of the rear edge portion is defined as h2. N represents the number of side plate portions 52s. This leads to the following formula:
Entrance side circumference: πD3 / 2 + π (D3-2h1) / 2 + Nh1 = πD3-πh1 + Nh1
Exit side circumference: πD3 / 2 + π (D3−2h2) / 2 + Nh2 = πD3−πh2 + Nh2
Here, since the axial diffuser 152 is formed by annularly forming the plate material on which the unevenness 52U is formed, the inlet-side circumferential length and the outlet-side circumferential length are equal. Thus, the above mathematical formula can be converted as follows.
Formula F2: N (h1−h2) −π (h1−h2) = 0

  Below, the manufacturing apparatus M of the axial diffuser 52 is demonstrated.

  Here, the manufacturing apparatus M of the axial diffuser 152 according to the first embodiment will be described. Note that the manufacturing apparatus M for the axial diffuser 152 described below cannot produce the axial diffusers 252, 352, 452, and 552 described above. However, the axial diffusers 252, 352, and 452 can be produced by a similar manufacturing apparatus.

  FIG. 18 is a diagram showing a manufacturing apparatus M (hereinafter referred to as “manufacturing apparatus M1”) according to the first embodiment. In addition, the arrow in a figure has shown the feed direction of the board | plate material (henceforth "the board | plate material P").

  The manufacturing apparatus M1 forms a plurality of irregularities 52U by bending a plate material. The manufacturing apparatus M1 includes a pair of formed gears G1 and G2 that rotate in opposite directions. More specifically, the manufacturing apparatus M1 includes a forming gear G1 rotated by a power mechanism and a forming gear G2 (hereinafter referred to as “first forming gear G1”) that rotates following the forming gear G1 (hereinafter referred to as “first forming gear G1”). 2 formed gear G2 ").

  The first forming gear G1 includes a plurality of teeth T around the rotation axis L1. The tooth T has the same shape as the outer plate portion 52o of the unevenness 52U in the shape of the tooth tip Tt. Further, the shape of the tooth bottom Tc connecting the two teeth T is the same as that of the inner plate portion 52i of the unevenness 52U. The tooth surface Ts connecting the tooth tip Tt and the tooth bottom Tc has the same shape as the side plate portion 52s of the unevenness 52U (curved surface based on the involute curve).

  Similarly, the second forming gear G2 also includes a plurality of teeth T around the rotation axis L2. The tooth T has the same shape of the tooth tip Tt as the inner plate portion 52i of the unevenness 52U. Further, the shape of the tooth bottom Tc connecting the two teeth T is the same as that of the outer plate portion 52o of the unevenness 52U. The tooth surface Ts connecting the tooth tip Tt and the tooth bottom Tc has the same shape as the side plate portion 52s of the unevenness 52U (curved surface based on the involute curve).

  With such a configuration, the plate material P is sandwiched between the teeth T of the first forming gear G1 and the second forming gear G2 and bent one after another. Thus, a plurality of irregularities 52U are formed on the plate material P. And the axial diffuser 152 is completed by making the board | plate material P in which the several unevenness | corrugation 52U was formed into a ring shape. The reason why the tooth surface Ts is a curved surface based on the involute curve is that it is simpler than the cycloid curve and an accurate tooth profile can be easily formed. Therefore, the unevenness 52U of the axial diffuser 152 can be formed without distortion.

  Next, the manufacturing apparatus M according to the second embodiment will be described.

  FIG. 19 is a diagram showing a manufacturing apparatus M (hereinafter referred to as “manufacturing apparatus M2”) according to the second embodiment.

  The manufacturing apparatus M2 is a further development of the manufacturing apparatus M1. Here, differences from the manufacturing apparatus M1 will be described.

  The manufacturing apparatus M2 includes a pair of rollers R1 and R2 that rotate in opposite directions. More specifically, the manufacturing apparatus M2 includes a roller R1 that is rotated via a power transmission mechanism and a roller R2 that is rotated by being driven by the roller R1 (hereinafter referred to as “first roller R1”). Roller R2 "). The first roller R1 and the second roller R2 rotate while sandwiching the plate material P, and send out the plate material P.

  With such a configuration, the plate material P is sent to the meshing portion of the first forming gear G1 and the second forming gear G2.

  The manufacturing apparatus M2 includes a pair of guides Gf1 and Gf2 for guiding the plate material P. Specifically, the manufacturing apparatus M2 includes a guide Gf1 provided along the track of the plate material P and a guide Gf2 (hereinafter referred to as “first guide Gf1”) disposed opposite to the guide Gf1 (hereinafter referred to as “first guide Gf1”). "Second guide Gf2"). The first guide Gf1 and the second guide Gf2 guide the plate material P to the meshing portion of the first forming gear G1 and the second forming gear G2. Note that the first guide Gf1 and the second guide Gf2 also have a role of correcting distortion generated by bending the plate material P.

  With such a configuration, the plate material P is fed without shifting to the meshing portion of the first forming gear G1 and the second forming gear G2. Moreover, the board | plate material P is correct | amended for the distortion which arose by bending.

  Here, in order to surely correct the distortion, notches may be provided intermittently in the plate material P, and the distortion may be absorbed by the notches. For example, as shown in FIGS. 21A and 21B, a notch 52J is provided in the inner plate portion 52i, and the notch 52J absorbs strain. In particular, as shown in FIG. 21B, in the case where the notch 52J is provided only on the rear edge side of the inner plate portion 52i, a step opposite to the flow of the compressed air does not occur, so that the flow of the compressed air is not disturbed. .

  Further, the manufacturing apparatus M2 includes a roller R3 for peeling the plate material P from the first forming gear G1. The roller R3 peels off the plate material P attached to the first forming gear G1, and sends out the plate material P.

  With such a configuration, the plate material P is sent to the next step without sticking to the first forming gear G1.

  Next, the manufacturing apparatus M according to the third embodiment will be described.

  FIG. 20 is a diagram showing a manufacturing apparatus M (hereinafter referred to as “manufacturing apparatus M3”) according to the third embodiment.

  The manufacturing apparatus M3 is a further development of the manufacturing apparatus M2. Here, differences from the manufacturing apparatus M2 will be described.

  The manufacturing apparatus M3 includes a pair of cutters C1 and C2 for cutting the plate material P. More specifically, the manufacturing apparatus M3 includes a cutter C1 provided so as to follow the trajectory of the plate material P and a cutter C2 (hereinafter referred to as “first cutter C1”) disposed opposite to the cutter C1. "Second cutter C2"). The first cutter C1 and the second cutter C2 cut the plate material P into a predetermined width.

  With such a configuration, the plate P is cut out to a predetermined width after being bent and sent to the next step.

  Below, the cutting method of the axial diffuser 52 is demonstrated.

  Here, the production process of the axial diffuser 252 according to the second embodiment will be described. Note that the cutting method described below cannot be applied to the axial diffuser 152 described above. However, the same cutting method can be applied to the axial diffusers 352, 452, and 552.

  FIG. 22 is a diagram showing a cutting method in the production process. FIG. 22A is a perspective view of the axial diffuser 252 at the time of cutting. 22B is a view of the axial diffuser 252 at the time of cutting as viewed from the direction of the arrow X, and FIG. 22C is a view as viewed from the direction of the arrow Y. 22D is a cross-sectional view showing the wall surface 52W during cutting.

  This cutting method cuts the front-end | tip part of the wall surface 52W, and adjusts the height dimension of this wall surface 52W. First, the filling Fw is inserted between the wall surface 52W and the wall surface 52W. Thereafter, the tip of the wall surface 52W is cut in a state where the strength of the wall surface 52W is secured by the filling Fw. By doing so, it is possible to avoid distortion and breakage of the wall surface 52W. Further, if the filling Fw is a metal material that melts at a low temperature, it can be easily removed after cutting.

DESCRIPTION OF SYMBOLS 100 Gas turbine engine 1 Compressor 2 Combustor 3 Turbine 4 Exhaust nozzle 5 Diffuser 51 Radial diffuser 52 Axial diffuser 152 Axial diffuser 52U Concavity and convexity 52i Inner plate part 52o Outer plate part 52s Side plate part 52p Guide passage 53 Inner ring 55 Outer ring 55 56 Main casing 57 Support structure M Manufacturing device M1 Manufacturing device P Plate material G1 Molded gear G2 Molded gear

Claims (6)

A compressor that compresses air by rotating;
A combustor for supplying fuel to the compressed air sent from the compressor and burning it;
A gas turbine engine configured to receive and rotate combustion gas sent from the combustor,
An axial diffuser for converting the velocity energy of the compressed air sent out from the compressor into pressure energy and arranging the flow of the compressed air to guide the combustor;
The axial diffuser is a gas turbine engine characterized in that unevenness formed by bending a plate material serves as a guide passage for compressed air.   2. The gas turbine engine according to claim 1, wherein the axial diffuser forms a blade row by the uneven side plate portions arranged radially by making the plate material annular. 3. Parts such as a hub arranged on the inner peripheral side of the axial diffuser;
An inner ring attached to a component such as the hub,
The axial diffuser is fitted so that the concave and convex inner plate portions arranged in the circumferential direction are in contact with the outer periphery of the inner ring by making the plate material annular. The gas turbine engine described in 1. Components such as a main casing disposed on the outer peripheral side of the axial diffuser;
An outer ring attached to a component such as the main casing,
The axial diffuser is fitted so that the uneven outer plate portion arranged in the circumferential direction is in contact with the inner periphery of the outer ring by making the plate member into an annular shape. 2. The gas turbine engine according to 2.   The gas turbine engine according to any one of claims 1 to 4, wherein the axial diffuser is formed by bending the plate member with a pair of formed gears rotating in opposite directions to each other.   The gas turbine engine according to claim 5, wherein the axial diffuser is formed by the forming gear having a curved tooth surface based on an involute curve.

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