CN113236371B

CN113236371B - Blade cold air conduit

Info

Publication number: CN113236371B
Application number: CN202110622479.2A
Authority: CN
Inventors: 谭思博; 尤宏德
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2021-06-04
Filing date: 2021-06-04
Publication date: 2023-01-17
Anticipated expiration: 2041-06-04
Also published as: CN113236371A

Abstract

The utility model relates to an aeroengine field especially relates to a blade air conditioning pipe, including the pipe shaft, be equipped with the air conditioning passageway in the pipe shaft, locate the cooling channel of blade in, the import one end of pipe shaft is equipped with fixed knot structure, the pipe end that links to each other with the blade and is equipped with location structure, location structure includes that the protrusion locates the protruding closure in the location on the pipe shaft lateral wall, the tip of location protruding closure offsets and the inner wall of cooling channel and the arc surface that the protruding closure surface of location is the evagination, set up in the protruding closure in the location and hold the chamber with the first of air conditioning passageway intercommunication. The air conditioner has the technical effects of improving the thermal contact resistance between the cold air guide pipe and the blades, and preventing the cooling structure of the blades from being damaged and the blades from being ablated.

Description

Blade air conditioning duct

Technical Field

The application belongs to the field of aircraft engines, and particularly relates to a blade cold air duct.

Background

As shown in FIG. 1, an aircraft engine turbine blade cooling air duct is mounted inside a turbine blade for blade cooling. The existing positioning mode needs to position the cold air duct by utilizing a plurality of positioning ribs 7 in the inner cavity of the guide blade 1, a large number of contact areas exist between the cold air duct and the inner cavity of the blade, and the contact thermal resistance is small. When the temperature of the wall surface of the guide vane 1 is too high, the heat in the combustion gas is transferred to the cold air duct through the vane and the contact area, which may cause local overheating failure of the cold air duct. The risk of damage to the blade cooling structure and blade ablation is increased. In addition, the blade cavity positioning ribs 7 increase the complexity of the cold air duct and the blade, and increase the manufacturing difficulty and the production cost. Therefore, a new positioning method is needed to reduce the local temperature of the cooling air duct.

Disclosure of Invention

The utility model aims at providing a blade air conditioning duct to adopt the location rib location and the higher problem of the local temperature of air conditioning duct that leads to among the prior art.

The technical scheme of the application is as follows: the utility model provides a blade air conditioning pipe, includes the pipe shaft, is equipped with the air conditioning passageway in the pipe shaft, locates in guide vane's cooling channel, the import one end of pipe shaft is equipped with fixed knot structure, pipe shaft end are equipped with location structure, location structure includes that the protrusion locates the protruding closure in the location on the pipe shaft lateral wall, the tip of location protruding closure offsets and the inner wall of cooling channel and the arc surface of location protruding closure surface for the evagination, set up in the protruding closure in the location and hold the chamber with the first of air conditioning passageway intercommunication.

Preferably, the positioning convex hull is of a spherical structure, and the positioning convex hull is in point-surface contact with the inner wall of the cooling channel.

Preferably, the positioning convex hulls are arranged on the pipe body at intervals along the outer circumferential surface direction of the pipe body.

Preferably, the positioning convex hulls are annularly arranged along the circumferential direction of the pipe body.

Preferably, the pipe shaft is outwards protruded to form a positioning ring corresponding to the inner side of the lower edge plate of the blade, the positioning ring is attached to the inner wall of the cooling channel, and a second accommodating cavity communicated with the cold air channel is formed in the positioning ring.

Preferably, the length ratio of the positioning ring is η = l ₀ /l ₁ Not less than 0.2, wherein l ₀ For the length of the positioning ring, /) ₁ The length of the pipe body extending section.

Preferably, the fixing structure comprises a flange arranged at the inlet of the pipe body, and the flange is in contact with and welded with a boss of the lower edge plate of the blade.

Preferably, the positioning convex bag is provided with impact holes communicated with the cold air channel and the cooling channel.

A guide vane for high-pressure turbine, comprising a vane body, a vane upper edge plate and a vane lower edge plate, wherein the cooling air duct as claimed in any one of claims 1 to 8 is arranged in the vane body.

The utility model provides a blade air conditioning pipe, through the terminal location convex closure that is used for the location that sets up at the shaft of pipe and cooling channel contact, the surface of location convex closure is the arc surface, and its area of contact with cooling channel is less, and thermal contact resistance between the two is showing and is increasing, has reduced cooling pipe local area's temperature by a wide margin, prevents that blade and air conditioning pipe from damaging.

Preferably, set up cylindrical position ring on the section of stretching out and carry out stable location and support to the pipe shaft to can seal cold air, prevent that cold air from spilling over.

Drawings

In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.

FIG. 1 is a schematic diagram of a background art structure;

FIG. 2 is a schematic view of the overall structure of the present application;

FIG. 3 is an enlarged view of portion A of FIG. 2;

FIG. 4 is an enlarged view of portion B of FIG. 2;

FIG. 5 is a schematic diagram of heat transfer of a prior art positioning structure;

FIG. 6 is a schematic heat transfer diagram of the positioning mechanism of the present application.

1-guide vanes; 2-a tube body; 3-a cold air channel; 4-a cooling channel; 5-positioning the convex hull; 6-a first containing cavity; 7-positioning ribs; 8-a positioning ring; 9-a second containing cavity; 10-flanging; 11-blade body; 12-a blade upper edge plate; 13-lower blade edge plate; 14-overhanging section.

Detailed Description

In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.

The utility model provides a blade air conditioning pipe, as shown in fig. 2, 3, is equipped with air conditioning passageway 3 in the pipe shaft 2, locates in guide vane 1's cooling channel 4, the import one end of pipe shaft 2 is equipped with fixed knot structure, 2 ends of pipe shaft are equipped with location structure, location structure includes that the protrusion locates the location convex closure 5 on the 2 lateral walls of pipe shaft, the tip of location convex closure 5 offsets and the inner wall of cooling channel 4 and the circular arc surface that 5 surfaces of location convex closure are the evagination, set up the first chamber 6 that holds with air conditioning passageway 3 intercommunication in the location convex closure 5.

As shown in FIG. 5, the contact area between the positioning mechanism and the blade is large, the thermal contact resistance is small, and the temperature of the local area of the cold air duct is high.

Accomplish the radial positioning to pipe shaft 2 through location convex closure 5, then realize fixing to pipe shaft 2 through fixed knot structure, because the location rib 7 in the cancellation cooling channel 4, the area of contact of the location convex closure 5 of pipe shaft 2 and blade 11 position is minimum, and the heat through convex closure transfer pipe is limited, mainly keeps apart by engine cooling gas between pipe and the blade, can not take place overtemperature failure.

As shown in FIG. 6, the heat of the fuel gas outside the blades is transferred to the outer wall surface of the guide blade 1 through the convection heat transfer effect, the heat of the blades is transferred to the inner cavity wall surface through the positioning convex hulls 5 through the heat conduction effect, the contact thermal resistance is large, and the temperature of the local area of the cold air duct is obviously reduced.

Because the positioning rib 7 is a square section, the pipe body 2 is easy to clamp during installation, and the outer surface of the positioning convex hull 5 is an arc surface, so that the pipe body can be easily installed in the cooling channel 4, the installation can be more accurate, and the positioning performance is better.

Example one, as a specific embodiment, a vane air conditioning duct

The guide vane 1 is used for increasing the inlet temperature of the turbine, the guide vane 1 is made of a heat-resistant material, a cooling channel 4 is arranged in the guide vane 1 for cooling, or a film hole is formed in the vane to form a cold air film on the surface of the vane so as to protect the vane.

The cold air guide pipe is arranged in the cooling channel 4, the guide vane 1 is cooled by introducing cold air, the cold air guide pipe is provided with impact holes, the impact holes are arranged on the pipe body 2 of the cold air guide pipe at intervals along the radial direction and the axial direction, and the cold air is sprayed into the cooling channel 4 in an impact mode to cool the vane.

The cold air enters the cold air channel 3 through the inlet of the pipe body 2 and then enters the cooling channel 4 through the impact hole of the cold air channel 3, so that the cooling is realized.

It includes pipe shaft 2, and pipe shaft 2 is by 13 departments of blade under the flange stretch into to blade 11 in, and the structure that pipe shaft 2 corresponds 13 departments of blade under the flange is overhanging

section

14, and 14 departments of overhanging section are located in the import of pipe shaft 2, and the end of pipe shaft 2, the one end that is close to 12 of blade upper flange promptly are equipped with location structure in order to radially fixing a position pipe shaft 2, are equipped with fixed knot structure on 14 in order with 13 reciprocal anchorages of blade under the flange.

The positioning structure comprises a positioning convex hull 5 protruding from the outer wall of the pipe body 2, the outer peripheral surface of the positioning convex hull 5 is an arc surface, and the positioning convex hull can be spherical or in other arc structures and is preferably spherical. The end of the positioning convex hull 5 is in point-surface contact with the inner wall of the cooling channel 4, the contact area is extremely small, and therefore the heat transfer between the positioning convex hull 5 and the blade airfoil 11 is limited.

The positioning convex hull 5 is lighter and smaller than the positioning rib 7, so as to avoid the cold air duct from being a cantilever structure and reduce the bending stress of the duct.

The positioning convex hull 5 is hollow inside and forms a first accommodation chamber 6 communicating with the cold air passage 3, capable of accommodating the cold air in the cold air passage 3. The positioning convex hull 5 can be of a closed structure, and can also be provided with impact holes communicated with the cold air channel 3 and the cooling channel 4, so that the circulation of cold air is realized. The provision of the first receiving chamber 1 increases the volume of the cold air path 3 and the inner surface of the cold air path 3.

Preferably, the positioning convex hulls 5 have multiple groups and are arranged at intervals along the direction of the outer peripheral surface of the pipe body 2, and realize accurate positioning at different positions along the circumferential direction of the cooling channel 4, and the number of the positioning convex hulls 5 is preferably 2-3.

As shown in fig. 2 and 4, preferably, in order to further achieve stable positioning, the position of the overhanging section 14 corresponding to the lower edge plate 13 of the blade is protruded outwards to form a cylindrical positioning ring 8, the positioning ring 8 is attached to the inner wall of the cooling channel 4, and a second accommodating cavity 9 communicated with the cold air channel 3 is opened inside the positioning ring 8. The provision of the second receiving chamber 9 increases the volume of the cold air path 3 and the inner surface of the cold air path 3.

Because this area is located the air conditioning side of blade lower fringe board 13, and is far away from the high temperature gas of mainstream canal, therefore the blade inner wall temperature of this department is lower, even with cooling channel 4 contact can not lead to the overtemperature to lose efficacy to can realize stable location and support to the radial of body of pipe 2. And long location structure also has the effect of utilizing the obturating to air conditioning, reduces the air conditioning from the

pipe shaft

2 and 4 gaps of cooling channel reveal, has improved impingement cooling's efficiency and quality.

Preferably, the length ratio η = l of the positioning ring 8 ₀ /l ₁ Not less than 0.2, wherein l ₀ For the length of the positioning ring 8, /) ₁ Is the length of the extending section 14 of the tube body 2. The positioning ring 8 can stably support the pipe body 2 within the length range.

Preferably, the fixing structure comprises a flange 10 arranged at the inlet of the overhanging section 14, and the flange 10 is contacted and welded with a boss of the lower blade edge plate 13 to realize stable fixing.

The invention has the following advantages:

1. temperature reduction of the cold air duct: compared with the original structure, the cooling structure has the advantages that the contact area is reduced, the contact thermal resistance is obviously increased, the temperature of the cold air duct area is greatly reduced, and the risks of damage of the cooling structure and ablation of the blades are avoided.

2. The structure is simple, the positioning rib 7 in the guide vane 1 is eliminated, and the structure of the vane is simpler.

3. The cost is reduced, the installation structure is cancelled, the blade processing difficulty is reduced, the number of working procedures is reduced, the product qualification degree is improved, and the blade manufacturing cost is further reduced.

4. The installation is convenient, the positioning convex hull 5 with the arc structure can enter the cooling channel 4 more conveniently for positioning, and the positioning can be more accurate.

The second embodiment is a specific implementation manner, and further comprises a blade cooling air duct, which has a structure substantially the same as that of the first embodiment, and is different in that the positioning convex hulls 5 are annular and are arranged at intervals around the outer circumferential surface of the tube body 2, and the positioning convex hulls 5 are arranged coaxially with the tube body 2, so that although the contact area between the positioning convex hulls and the cooling channel 4 is slightly increased, the stability is higher, and the length of the positioning rings 8 can be correspondingly reduced.

In the third embodiment, as a specific implementation manner, the high-pressure turbine guide vane 1 further includes a vane blade 11, a vane upper edge plate 12, and a vane lower edge plate 13, the vane upper edge plate 12 is disposed radially above the vane blade 11, the vane lower edge plate 13 is disposed radially below the vane blade 11, and the cold air duct in the first embodiment or the second embodiment is disposed in the vane blade 11.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. The utility model provides a blade air conditioning pipe, includes shaft (2), is equipped with air conditioning passageway (3) in shaft (2), locates in cooling channel (4) of guide vane (1), its characterized in that: a fixing structure connected with the blades is arranged at one inlet end of the pipe body (2), a positioning structure is arranged at the tail end of the pipe body (2), the positioning structure comprises a positioning convex hull (5) which is convexly arranged on the side wall of the pipe body (2), the end part of the positioning convex hull (5) is abutted against the inner wall of the cooling channel (4), the outer surface of the positioning convex hull (5) is a convex arc surface, and a first accommodating cavity (6) communicated with the cold air channel (3) is formed in the positioning convex hull (5);

the positioning convex hull (5) is of a spherical structure, and the positioning convex hull (5) is in point-surface contact with the inner wall of the cooling channel (4);

the positioning convex hulls (5) are provided with a plurality of groups at intervals along the peripheral surface direction of the pipe body (2);

pipe shaft (2) correspond the inboard position of the lower fringe board of blade and outwards bulge and form holding ring (8), holding ring (8) paste mutually with the inner wall of cooling channel (4), set up in holding ring (8) and hold chamber (9) with the second of air conditioning passageway (3) intercommunication.

2. The cool air duct with blades as set forth in claim 1, wherein: the positioning convex hulls (5) are annularly arranged along the circumferential direction of the pipe body (2).

3. The vane cold air duct of claim 1, wherein: the length ratio eta = l of the positioning ring (8) ₀ /l ₁ Not less than 0.2, wherein l ₀ Is the length of the positioning ring (8) | ₁ Is the length of the extending section (14) of the pipe body (2).

4. The cool air duct with blades as set forth in claim 1, wherein: the fixing structure comprises a flanging (10) arranged at the inlet of the pipe body (2), and the flanging (10) is in contact with and welded with a boss of the lower edge plate (13) of the blade.

5. The vane cold air duct of claim 1, wherein: and the positioning convex hull (5) is provided with impact holes communicated with the cold air channel (3) and the cooling channel (4).

6. A high-pressure turbine guide vane comprises a vane blade body (11), an upper vane edge plate (12) and a lower vane edge plate (13), and is characterized in that: the blade body (11) is provided with a cold air duct according to any one of claims 1-5.