JP3143728B2 - Gas turbine engine enclosure device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a stationary type, a portable type,
The present invention relates to an improvement in an enclosure device for silencing and cooling a vehicle-mounted gas turbine engine.

[0002]

2. Description of the Related Art In general, when a gas turbine engine is used as a prime mover for driving a generator or the like, a box-shaped enclosure surrounding the engine body is provided for noise reduction, but heat generated by the gas turbine engine inside the enclosure is removed. In order to do so, ventilation of the enclosure is indispensable, and a fan for forcing cooling air into the space inside the enclosure is provided.
Reference is made to JP-A-2-126528 and JP-A-58-163542.

[0003] As a conventional gas turbine engine enclosure device, Japanese Patent Application Laid-Open No. 3-21002 has been proposed by the present applicant.
No. 9 has already been proposed as shown in FIG.

[0004] Referring to Fig. 1, reference numeral 1 denotes a gas turbine engine main body. An engine intake port 1a is opened at one end, and an engine exhaust port 1b is opened at the other end. The generator (not shown) is driven by the rotating force.

A box-type enclosure 2 surrounding the gas turbine engine body 1 is provided outside the gas turbine engine body 1 so as to cut off engine noise. The enclosure 2 is provided with an inlet plenum 3 for taking in engine intake and an exhaust outlet 4 connected to the engine exhaust port 1b for discharging engine exhaust to the outside.

A cylindrical engine cover 5 is provided inside the enclosure 2 along the outer surface 1c of the gas turbine engine main body 1, and a cylindrical inner duct facing the engine cover 5 at a predetermined interval. 6 is interposed between the engine body 1 and the outer surface 1c.

A large number of holes 13 are opened in the inner duct 6, and a flow path 7 defined between the engine cover 5 and the inner duct 6 communicates with a cooling fan 9 for forcingly sending cooling air, while the inner duct is formed. A flow path 10 defined inside 6 communicates with a cooling air outlet 12, and guides the cooling air to the outer surface 1 c of the gas turbine engine body 1 through each hole 13 of the inner duct 6 as indicated by an arrow in the figure. It has a configuration.

[0008] Engine cover 5 and inner duct 6
The flow cross section of the cooling air is limited around the gas turbine engine main body 1 through the gas turbine engine, thereby increasing the flow velocity of the cooling air flowing along the outer surface 1c of the gas turbine engine main body 1 and reducing the gas flow with a small amount of cooling air. Turbine engine body 1
The heat of the cooling fan 9 is effectively released, and the size of the cooling fan 9 is reduced. In addition, one end of the ignition plug attached to the combustor faces the flow path 10 defined inside the inner duct 6,
The heat near the spark plug, which tends to be high in temperature due to the cooling air flowing through the flow path 10, is taken away.

[0009]

On the outer surface 1c of the engine, one end of a spark plug attached to the combustor protrudes. Among the outer surface 1c of the engine, one end of the spark plug faces the inside of the combustor and the same. The surrounding area tends to reach the highest temperature, and high cooling performance is required.

However, in such a conventional gas turbine engine enclosure device, an ignition plug (not shown) is connected to the exhaust outlet 4 of the gas turbine engine body 1.
And the cooling air outlet 12, which is located on the right side in the figure and is located downstream of the flow path 10 defined inside the inner duct 6. The cooling air whose temperature has risen by absorbing the heat of 1 is guided to the ignition plug, and it is difficult to sufficiently cool the ignition plug and its surroundings.

Since the pressure inside the engine cover 5 rises to about several tens mmAq due to the air blown from the cooling fan 9, when the engine cover 5 is formed of a thin metal panel, the amount of deformation increases. When the engine cover 5 is made of a thick heat insulating material, stress concentration occurs at the corners of the engine cover 5 and it is difficult for the strength to be reduced.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to improve cooling performance and structural strength in an enclosure device for a gas turbine engine.

[0013]

According to the first aspect of the present invention,
In a gas turbine engine enclosure device including an engine cover that covers a gas turbine engine body and a cooling fan that takes in air outside the engine cover to cool the inside of the engine cover, an ignition projecting outside the gas turbine engine body An ignition plug cover that covers the periphery of the plug, and a bypass passage that guides the air taken in by the cooling fan inside the ignition plug cover.

According to a second aspect of the present invention, there is provided a gas turbine engine enclosure device including a generator driven by the gas turbine engine main body, a generator room in which the generator is disposed, and an engine room in which the gas turbine engine main body is disposed. An engine cover that defines each, a cooling fan that takes air outside the engine cover into the generator room,
An ignition plug cover is provided to cover around an ignition plug protruding outside the gas turbine engine body, and a bypass passage is provided to bypass the engine room and communicate between the generator room and the inside of the ignition plug cover.

According to a third aspect of the present invention, in the gas turbine engine enclosure device according to the first or second aspect, the engine cover is formed in a box shape having a corner, and the corner is partitioned. The bypass passage is defined by a member from inside the engine cover.

[0016]

In the gas turbine engine enclosure device according to the first aspect, part of the cooling air introduced into the engine cover by the cooling fan flows while absorbing heat of the gas turbine engine, and the rest flows through the bypass passage. The spark plug is then guided into the spark plug cover, and flows inside the spark plug cover while absorbing heat from the spark plug and its surroundings, and is discharged to the outside.

By limiting the cross section of the cooling air flow path around the gas turbine engine main body through the engine cover, the flow velocity of the cooling air flowing along the outer surface of the gas turbine engine main body is increased, thereby reducing the amount of cooling air. As a result, the heat of the gas turbine engine body is effectively released, and the size of the cooling fan is reduced. The cooling air guided into the spark plug cover passes through the bypass passage, so that it hardly absorbs the heat of the gas turbine engine body, so that its temperature can be lowered and the cooling performance of the spark plug and its surroundings can be enhanced.

According to a second aspect of the present invention, a part of the cooling air taken into the generator room by the cooling fan absorbs heat of the gas turbine engine from the generator room through the engine room. The remainder flows from the generator room through the bypass passage into the spark plug cover, flows inside the spark plug cover while absorbing the heat of the spark plug and its surroundings, and is discharged to the outside.

The flow velocity of the cooling air flowing along the outer surfaces of the generator and the gas turbine engine body is increased by limiting the cross section of the cooling air flow path around the generator and the gas turbine engine body via the engine cover. Thus, the heat of the generator and the gas turbine engine body can be effectively released with a small amount of cooling air, and the size of the cooling fan can be reduced. The cooling air guided into the spark plug cover bypasses the engine room through the bypass passage, thereby hardly absorbing the heat of the gas turbine engine body, lowering the temperature and reducing the temperature of the spark plug and its surroundings. Cooling performance can be improved.

According to a third aspect of the present invention, in the case where the engine cover is formed of a heat insulating material having a large thickness, the partition member is provided facing the inside of the corner of the engine cover. In addition, the partition member disperses the stress concentration generated at the corners of the engine cover and increases the strength of the engine cover.

When the engine cover is formed of a thin metal plate or the like, the engine cover is provided with a partition member facing the inside of the corner, so that the partition member is formed of the engine cover of the engine cover. The rigidity is increased, and the deformation of the engine cover can be sufficiently suppressed.

[0022]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2, 1 is a gas turbine engine main body, 1d is an intake duct, 1e is an exhaust silencer, and 1f is an exhaust port.

Although not shown, the gas turbine engine body 1 has a compressor that draws in air and compresses it to a required pressure, and a combustion that burns fuel inside and heats compressed air sent from the compressor to produce high-temperature gas. Vessels,
Basically, it consists of a turbine that converts the energy of the combustion gas emitted from the combustor into mechanical work, and a heat exchanger that heats the compressed air sent from the compressor to the combustor by the heat of the exhaust gas discharged from the turbine. It is composed of

The combustor of the gas turbine engine body 1 is disposed on the upper part thereof, and the ignition plug 1 provided in the combustor is provided.
6 and the fuel injection valve 17 are disposed above the exhaust silencer 1e. One end of the ignition plug 16 and one end of the fuel injection valve 17 protrude from the outer surface 1c of the gas turbine engine main body 1, and the other end faces the inside of the combustor.

A generator 8 is directly connected to the turbine shaft of the gas turbine engine body 1. Gas turbine engine body 1
And the generator 8 are arranged side by side with the intermediate casing 40 interposed therebetween, and are fixed to the chassis 15 provided below each.

A box-shaped enclosure 2 for accommodating the gas turbine engine body 1, the generator 8 and the like includes a chassis 15
, So as to block engine noise.

The enclosure 2 has an intake port 21 for taking in the engine intake and a ventilation port 22 and an opening 24 for passing through an exhaust port 1f for discharging engine exhaust to the outside and a ventilation port 5e.

Inside the enclosure 2 is provided an engine cover 5 surrounding the gas turbine engine body 1, the exhaust silencer 1e, the generator 8 and the like. The engine cover 5 is fixed to the chassis 15.

The engine cover 5 has a small rectangular box shape and surrounds the generator 8. The generator cover 5 a surrounds the generator 8, and the body cover 5 b surrounds the gas turbine engine body 1.
And a large box-shaped silencer cover 5c surrounding the exhaust silencer 1e, a ventilation outlet 5e protruding from one end of the silencer cover 5c toward the outside of the enclosure 2, and the like. It is formed.

On the side of the generator cover 5a, three cooling fans 9 are mounted side by side. Each cooling fan 9 sucks the outside air taken into the enclosure 2 from the ventilation inlet 22, and forcibly sends it as cooling air to the generator room 21 in the generator cover 5a.

Most of the cooling air sent into the generator room 21 passes through the engine room 22 in the main body cover 5b and the silencer room 23 in the silencer cover 5c.
The air is discharged from the ventilation outlet 5e to the outside.

As shown in FIG. 3, an ignition plug cover 25 surrounding the ignition plug 16 and the fuel injection valve 17 is provided inside the engine cover 5. One end of the cylindrical ignition plug cover 25 is fitted to the flange 26 of the combustor by face-to-face engagement.

As shown in FIGS. 4 and 5, the ignition plug cover 25 includes a cylindrical portion 25a defining an ignition plug chamber 31, an inlet duct 25b extending obliquely upward from the cylindrical portion 25a, and
An outlet duct portion 25c extending from the cylindrical portion 25a so as to avoid the exhaust silencer outlet duct 1g is formed integrally with a heat insulating material.

The spark plug cover 25 is disposed between the gas turbine engine body 1 and the exhaust silencer outlet duct 1g. The cylindrical portion 25a of the spark plug cover 25 is the exhaust silencer 1
e, a planar lower surface 25e is formed to be joined to e.

The outlet duct 25c of the ignition plug cover 25 is formed to be curved along the exhaust silencer outlet duct 1g.

As described above, the ignition plug cover 25 is attached to the exhaust silencer 1e and the exhaust silencer exit duct 1g in such a manner that the lower surface 25e and the outlet duct portion 25c are attached to the exhaust silencer 1e and the exhaust silencer outlet duct 1g. In addition, the deviation in the circumferential direction is suppressed to a small value, and sufficient assembly accuracy can be obtained.

The engine cover 5 is provided with a bypass passage 30 for guiding a part of the cooling air sent into the generator room 21 to the ignition plug room 31 by bypassing the engine room 22.

As shown in FIG. 4, the main body cover portion 5b of the engine cover 5 has a curved portion 5r curved along the outer surface 1c of the gas turbine engine main body 1, and a corner bent at a right angle away from the outer surface 1c. 5q.

A partition member 35 is attached to the engine cover 5 so as to face the inside of the corner 5q. The partition member 35 is formed in a flat plate shape by a heat insulating material, and defines a bypass passage 30 having an isosceles triangular cross section between the partition member 35 and the corner 5q.

A hole 36 constituting the bypass passage 30 is opened in the end wall 5s of the engine cover 5. Outside the end wall 5s of the engine cover 5, a bypass duct 37 connecting the hole 36 and the generator room 21 is provided.

A hole 38 communicating with the inlet duct 25b of the ignition plug cover 25 is opened in the partition member 35. A plate 39 is attached over one end of the partition member 35 and the corner 5q, and closes this opening.

An intermediate casing 40 for connecting the gas turbine engine body 1 and the generator 8 is provided between them. The flange portion 41 of the intermediate casing 40, which is connected to the gas turbine engine main body 1, protrudes in a disk shape, and minimizes the flow passage cross-sectional area of the cooling air between the end wall 5s of the engine cover 5 and the main body cover portion 5b. The squeezing section 42 is defined.

The bypass duct 37, which constitutes one end of the bypass passage 30, is connected to the generator room 21 upstream of the throttle 42.
It is open to. The minimum flow passage cross-sectional area of the bypass passage 30 is formed to be smaller at a predetermined ratio with respect to the flow passage cross-sectional area of the throttle portion 42, and the flow rate of the cooling air guided to the ignition plug chamber 31 through the bypass passage 30 is arbitrarily determined. Set.

The joints such as the engine cover 5, the ignition plug cover 25, the partition member 35, and the plate 39 made of a heat insulating material are fixed to each other via a tape.

The configuration is as described above. Next, the operation will be described.

During operation of the gas turbine engine, each cooling fan 9 is operated, and the outside air taken into the enclosure 2 from the ventilation inlet 22 is sucked as shown by an arrow in the figure, and the generator cover 5a is used as cooling air. Generator room 2 inside
Forcibly send to 1.

Most of the cooling air sent into the generator room 21 passes through the engine room 22 in the main body cover 5b and the silencer room 23 in the silencer cover 5c.
The air is discharged from the ventilation outlet 5e to the outside.

By limiting the flow cross section of the cooling air through the engine cover 5 around the gas turbine engine main body 1, the flow velocity of the cooling air flowing along the outer surface 1c of the gas turbine engine main body 1 is increased, The heat of the gas turbine engine body 1 is effectively released with a small amount of cooling air, and the size of the cooling fan 9 is reduced. A part of the cooling air sent into the generator room 21 bypasses the engine room 22 and passes through the bypass passage 30 to the ignition plug room 3.
1, and after passing through the ignition plug chamber 31, the ventilation outlet 5e
Is discharged to the outside.

Even if there is a gap between the cylindrical spark plug cover 25 and the flange 26 of the combustor to which it is fitted, there is almost no pressure difference between the inside and the outside of the spark plug chamber 31. The amount of cooling air flowing between the stopper chamber 31 and the silencer chamber 23 can be kept small.

One end of the ignition plug attached to the combustor protrudes from the ignition plug chamber 31, and the ignition plug facing the inside of the combustor and its surroundings among the engine outer surface 1c is most likely to become the highest temperature, and high cooling performance is obtained. Required.

The cooling air guided to the ignition plug chamber 31 passes through the bypass passage 30 and hardly absorbs the heat of the gas turbine engine body 1, and its temperature is lowered to cool the ignition plug and its surroundings. You can enhance the nature.

The minimum flow passage cross-sectional area of the flange portion 41 of the intermediate casing 40 connected to the gas turbine engine main body 1 and the throttle portion 42 defined between the end wall 5s of the engine cover 5 and the main body cover portion 5b. On the other hand, by forming the minimum flow path cross-sectional area of the bypass passage 30 at a predetermined ratio, it is possible to arbitrarily set the flow rate of the cooling air guided to the ignition plug chamber 31 through the bypass passage 30. Therefore, the spark plug and its surroundings can be sufficiently cooled.

Since the pressure inside the engine cover 5 rises to about several tens mmAq due to the air blown from the cooling fan 9, when the engine cover 5 is formed of a thick heat insulating material, the corner 5q of the engine cover 5 is formed. May cause stress concentration.

The engine cover 5 is provided with a partition member 35 facing the inside of the corner 5q, so that the partition member 3 is provided.
5 disperses the stress concentration generated at the corners 5q of the engine cover 5 and increases the strength of the engine cover 5.

Next, in another embodiment shown in FIG. 6, the engine cover 5, the spark plug cover 25, the partition member 35 and the like are formed of a relatively small metal plate. Note that parts corresponding to those in FIGS. 1 to 5 are described using the same reference numerals.

The engine cover 5 has a small rectangular box shape and surrounds the generator 8, and a main body cover 5 b surrounding the gas turbine engine 1.
And a large box-shaped silencer cover 5c surrounding the exhaust silencer 1e, a ventilation outlet 5e protruding from one end of the silencer cover 5c toward the outside of the enclosure 2, and the like. Is done.

The engine cover 5 is provided with a partition member 35 facing the inside of the corner 5q. The partition member 35 is formed in a flat plate shape by a metal plate, and defines a bypass passage 30 having an isosceles triangular cross section between the partition member 35 and the corner 5q.

The joints of the metal plates such as the engine cover 5, the spark plug cover 25, and the partition member 35 are fixed to each other by spot welding.

Also in this case, since the pressure inside the engine cover 5 rises to about several tens mmAq by the air blown from the cooling fan 9, when the engine cover 5 is formed of a thin metal plate, the deformation amount increases. there is a possibility.

A partition member 35 is provided on the engine cover 5 so as to face the inside of the corner 5q.
Numeral 5 enhances the rigidity of the engine cover 5 of the engine cover 5 and sufficiently suppresses the deformation of the engine cover 5.

[0062]

As described above, the first aspect of the present invention provides a gas turbine having an engine cover for covering a gas turbine engine body, and a cooling fan for taking in air outside the engine cover and cooling the inside of the engine cover. In the turbine engine enclosure device, an ignition plug cover that covers around an ignition plug protruding outside the gas turbine engine body, and a bypass passage that guides air taken in by the cooling fan to the inside of the ignition plug cover are provided. The cooling air guided into the spark plug cover, by passing through the bypass passage, hardly absorbs the heat of the gas turbine engine body, lowers its temperature and easily overheats the spark plug and its cooling performance. Can be enhanced.

According to a second aspect of the present invention, there is provided a gas turbine engine enclosure device including a generator driven by the gas turbine engine main body, a generator room in which the generator is disposed, and an engine room in which the gas turbine engine main body is disposed. An engine cover that defines each, a cooling fan that takes air outside the engine cover into the generator room,
An ignition plug cover that covers an ignition plug that protrudes outside the gas turbine engine body; and a bypass passage that bypasses the engine room and communicates with the generator room and the inside of the ignition plug cover. The cooling air guided into the engine plug bypasses the engine room through the bypass passage from the generator room, hardly absorbs the heat of the gas turbine engine body, lowers its temperature, and is easily overheated. And the cooling performance around it.

According to a third aspect of the present invention, in the gas turbine engine enclosure device according to the first or second aspect, the engine cover is formed in a box shape having a corner, and the corner is partitioned. When the engine cover is formed of a thick heat insulating material or the like, the partitioning member disperses the stress concentration generated at the corners of the engine cover, and the engine cover is formed by defining the bypass passage from the inside of the engine cover with members. The strength of the cover can be increased.
Further, when the engine cover is formed of a thin metal plate or the like, the partition member increases the rigidity of the engine cover of the engine cover and sufficiently suppresses the deformation of the engine cover.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of an enclosure device showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the enclosure device viewed from a lateral direction.

FIG. 3 is a sectional view of the enclosure device as viewed from above.

FIG. 4 is a sectional view of the enclosure device as viewed from the front.

FIG. 5 is a sectional view of the enclosure device as viewed from the rear.

FIG. 6 is a cross-sectional view of an enclosure device according to another embodiment viewed from a lateral direction.

FIG. 7 is a sectional view of an enclosure device showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas turbine engine main body 1e Exhaust silencer 2 Enclosure 5 Engine cover 5a Generator cover 5b Body cover 5c Silencer cover 5e Ventilation outlet 5s End wall 5q Corner 8 Generator 9 Cooling fan 16 Ignition plug 21 Generator room 22 Engine Chamber 23 Silencer chamber 25 Spark plug cover 25a Cylindrical part 25b Inlet duct part 25c Outlet duct part 26 Combustor flange 30 Bypass passage 35 Partition member 37 Bypass duct 40 Intermediate casing 40a Flange part 42 Throttle part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02C 7/18 F01P 5/06 503 F01P 5/06 511

Claims (3)

(57) [Claims] An engine cover for covering a gas turbine engine body, a cooling fan for taking in air outside the engine cover to cool the inside of the engine cover, and an ignition plug protruding outside the gas turbine engine body. An enclosure device for a gas turbine engine, comprising: an ignition plug cover to be covered; and a bypass passage for guiding air taken in by the cooling fan inside the ignition plug cover. 2. A generator driven by the gas turbine engine main body, an engine cover defining a generator room in which the generator is disposed and an engine chamber in which the gas turbine engine main body is disposed, respectively; A cooling fan that takes in air outside of the gas turbine into the generator room; a spark plug cover that covers around a spark plug protruding outside the gas turbine engine body; a generator room that bypasses the engine room; An enclosure device for a gas turbine engine, comprising: a bypass passage communicating with the inside. 3. The engine according to claim 1, wherein the engine cover is formed in a box shape having a corner, and the corner is defined from the inside of the engine cover by a partition member to constitute the bypass passage.
The gas turbine engine enclosure device according to any one of the above.