CN114720134A

CN114720134A - Air entraining structure for core machine test

Info

Publication number: CN114720134A
Application number: CN202210265607.7A
Authority: CN
Inventors: 张倩; 牛俊涛; 王天一; 汤旭
Original assignee: AECC Shenyang Engine Research Institute
Current assignee: AECC Shenyang Engine Research Institute
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-07-08

Abstract

The application belongs to the field of core machine design, and relates to a gas-leading structure for a core machine test, which comprises a gas-leading pipe installation section, a gas-leading pipe sealing section and a gas-leading pipe insertion section, wherein when the gas-leading pipe is installed, the gas-leading pipe is directly inserted into the inner side of a rear force bearing machine box from the outer side of the rear force bearing machine box, and then the installation can be completed by fixing the gas-leading pipe installation section, so that the installation is convenient; when the bleed air pipe needs to be replaced or maintained, the whole bleed air pipe can be pulled out outwards by opening the fixed position of the bleed air pipe mounting section, and the disassembly is convenient. The core machine is not required to be dismounted, so that the effective dismounting can be completed, and the use is convenient; through setting up the portable structure of obturating of first axial and the portable structure of obturating of second axial, the bleed pipe is accomplished the back in the installation, and the structure of obturating carries out the obturating to bleed pipe outer end through the portable structure of obturating of first axial, carries out the obturating to bleed pipe inner through the portable structure of obturating of second axial, and the bleed pipe is inseparable in the use, can not take place revealing, job stabilization of air conditioning.

Description

Air entraining structure for core machine test

Technical Field

The application belongs to the field of core machine design, and particularly relates to a core machine is bleed structure for experiment.

Background

The core engine is a core part composed of a high-pressure compressor, a combustion chamber and a high-pressure turbine in a gas turbine engine. The core engine components are in the most severe operating environment (high temperature, high pressure, high rotational speed) in gas turbine engines and are the most core components of the engine. Therefore, a series of core machine tests can be independently developed in the engine engineering development process, and supports or technical reserves are made for engine product development. In the test process of the core machine, a large amount of rack cold air is introduced to cool the bearing and the inner cone of the spray pipe through a rear casing air-entraining structure between the outlet of the high-pressure turbine and the exhaust device (spray pipe). The operating environment of the aft case bleed air structure is shown in fig. 1.

At present, in a commonly used rear casing air-entraining structure, an air-entraining pipe cone head 2 is welded at the lower end of an air-entraining pipe 1, an air-entraining pipe external nut 3 is installed outside the cone head, an air-entraining pipe ball head 4 is installed inside the rear casing, the air-entraining pipe is inserted inwards from the external casing during assembly, the nut and the ball head are screwed tightly, and the structure is shown in fig. 2. The turbine rear casing structure is mainly used for a rear casing structure of a whole machine, is positioned behind a low-pressure turbine, and is relatively low in environmental temperature and pressure.

The existing rear casing air-entraining structure has the following defects:

1) limited flow of cold air

Because the lower end of the existing bleed pipe is matched by threads, the cross section of the bleed pipe needs to be a round pipe and is limited by the space of a support plate of a rear bearing machine box, the bleed flow of the round bleed pipe is limited, and the requirement of cold air of an inner cone of the spray pipe cannot be met.

2) Insufficient thermal deformation coordination capability

The bleed air pipe passes through the five-layer structure, and is respectively a bearing seat 5, a heat insulation cover 6, a rear bearing box inner ring 7, a rear bearing box outer ring 8 and a culvert casing 9 from inside to outside, as shown in fig. 2. The temperature gradient of the five-layer structure is above 400 ℃, the thermal deformation coordination among different layers of structures is difficult, and the existing structure is only provided with a sealing ring at the outer end of the air-entraining pipe for adjusting the thermal deformation amount and cannot meet the use requirement.

3) Complicated assembly, disassembly and maintenance

The existing air entraining structures are in threaded connection, and are locked at the lower end of the air entraining pipe through lock wires for preventing threads from loosening in the test run process. If the core machine needs to assemble and disassemble the bleed air pipe in the bench test run process, the cover plate 10 (see fig. 2) at the rear end needs to be disassembled for disassembly. The disassembly and assembly operation is complex, the limitation of space is large, the core machine can only be disassembled from the platform generally, the period is long, the cost is high, and a great deal of inconvenience is brought to the test.

Therefore, how to ensure that the bleed air pipe is convenient to install and detach and simultaneously, the cold air flow of the bleed air pipe is lifted is a problem to be solved.

Disclosure of Invention

The application aims at providing a core machine is bleed structure for experiment to solve among the prior art bleed pipe bleed air flow few, ann tear inconvenient problem open.

The technical scheme of the application is as follows: a gas-leading structure for a core machine test comprises a gas-leading pipe mounting section, a gas-leading pipe sealing section and a gas-leading pipe inserting section; the utility model discloses a pneumatic machine, including bleed pipe, bleed pipe installation section, fixed connection, bleed pipe plugging section, bleed pipe sealing section, bleed pipe installation section, bleed pipe plugging section, bleed pipe installation section, fixed connection can be dismantled with the bleed pipe, be connected with the portable structure of obturating of first axial that can follow bleed pipe axial displacement between bleed pipe sealing section and the back power machine casket, be connected with the portable structure of obturating of second axial that can follow bleed pipe axial displacement between bleed pipe plugging section and the back power machine casket.

Preferably, the bleed air duct is oval in cross-section.

Preferably, the mounting structure of the bleed air pipe mounting section comprises an outer flange and a casing mounting seat, the outer flange is integrally and coaxially connected to the bleed air pipe mounting section, the casing mounting seat is arranged on the rear bearing casing, and the outer flange is in bolted connection with the casing mounting seat.

Preferably, the first axially movable sealing structure comprises two sets of limiting rings, a limiting sleeve and a sealing ring, the two sets of limiting rings are coaxially connected to the sealing section of the bleed pipe along the axial direction of the bleed pipe, two sets of limiting ring supports form a first mounting groove, the sealing ring is mounted in the first mounting groove, the limiting sleeve is arranged on the rear bearing case and coaxially arranged with the bleed pipe, and the outer wall of the limiting ring is attached to the inner wall of the limiting sleeve.

Preferably, the second axially movable sealing structure comprises support sleeves, sealing rubber rings and a sealing mechanism, the support sleeves are integrally and coaxially connected to the inserting sections of the air entraining pipes, the support sleeves are arranged in at least two groups, each group of sealing rubber rings is arranged in at least one group, and each group of sealing rubber rings is arranged between two adjacent groups of support sleeves; the sealing mechanism is arranged on the rear bearing casing, and a sealing sleeve sleeved on the outer sides of the support sleeve and the sealing rubber ring is arranged on the sealing mechanism.

Preferably, the sealing mechanism further comprises a first support frame connected to one side of the sealing sleeve and a second support frame connected to the other side of the sealing sleeve, the first support frame is in bolted connection with a bearing seat of the rear bearing case, and the second support frame is in bolted connection with a cover plate on the rear bearing case; be equipped with the first fixed plate that sets up along the bleed pipe axial on the first support frame, be equipped with the second fixed plate that sets up along the bleed pipe axial on the second support frame, first fixed plate and second fixed plate laminate each other and be connected with between first fixed plate and the second fixed plate and carry out the fastening bolt fixed to both.

Preferably, the device also comprises an outer section of the bleed air pipe, a positioning section of the bleed air pipe and an inner section of the bleed air pipe; the outer section of the bleed air pipe is connected with the sealing section of the bleed air pipe, the outer section of the bleed air pipe penetrates through the main gas channel, the positioning section of the bleed air pipe is connected with the outer section of the bleed air pipe, the positioning section of the bleed air pipe is arranged between the main gas channel and the inner cavity of the rear power bearing machine box, the inner section of the bleed air pipe is connected between the positioning section of the bleed air pipe and the inserting section of the bleed air pipe, and the inner section of the bleed air pipe is arranged in the inner cavity of the rear power bearing machine box; be equipped with the holding ring on the bleed pipe location section, the outside of holding ring is equipped with the bleed pipe mount pad, the bleed pipe mount pad includes half mount pad on a left side and half mount pad on the right side, first location half groove has been seted up in half mount pad on a left side, second location half groove has been seted up in half mount pad on the right side, first location half groove and second location half groove cooperate with the both sides joint of holding ring respectively, half mount pad on a left side and half mount pad on the right side and rear bearing machine casket bolted connection.

The air entraining structure for the core machine test comprises an air entraining pipe mounting section, an air entraining pipe sealing section and an air entraining pipe inserting section, wherein when the air entraining pipe is mounted, the air entraining pipe is directly inserted into the inner side of a rear bearing machine box from the outer side of the rear bearing machine box, and then the air entraining pipe mounting section is fixed to finish mounting, so that the mounting is convenient; when the bleed air pipe needs to be replaced or maintained, the whole bleed air pipe can be pulled out by opening the fixed position of the mounting section of the bleed air pipe, and the disassembly is convenient. The core machine is not required to be dismounted in the process of dismounting the bleed air pipe, so that the effective dismounting can be completed, and the use is convenient; through setting up the portable structure of obturating of first axial and the portable structure of obturating of second axial, the bleed pipe is accomplished the back in the installation, and the structure of obturating carries out the obturating to bleed pipe outer end through the portable structure of obturating of first axial, carries out the obturating to bleed pipe inner through the portable structure of obturating of second axial, and the bleed pipe is inseparable in the use, can not take place revealing, job stabilization of air conditioning.

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 prior art rear bearing box bleed air configuration;

fig. 2 is a schematic view of a connection structure of a rear bearing casing and a bleed pipe in the background art;

FIG. 3 is a schematic view of a bleed duct configuration of the present application;

fig. 4 is a schematic view of a connection structure of a bearing case and a bleed air pipe after the application;

figure 5 is a schematic view of the bleed air duct mount of the present application.

1. A bleed pipe; 2. a gas-guiding pipe conical head; 3. a nut is additionally arranged on the air guide pipe; 4. a ball head of the air guide pipe; 5. a bearing seat; 6. a heat shield; 7. an inner ring of the rear bearing machine box; 8. an outer ring of the rear bearing machine box; 9. a culvert casing; 10. a cover plate; 11. a bleed pipe mounting section; 12. a gas guide pipe sealing section; 13. an outer segment of the bleed duct; 14. a gas guide pipe positioning section; 15. an inner section of the bleed pipe; 16. a gas guide pipe inserting section; 17. an outer flange; 18. a casing mounting seat; 19. a limiting ring; 20. a limiting sleeve; 21. a seal ring; 22. a support sleeve; 23. sealing the rubber ring; 24. sealing sleeves; 25. a first support frame; 26. a second support frame; 27. fastening a bolt; 28. a positioning ring; 29. a left half mount; 30. a right half mounting seat; 31. a first positioning half-groove; 32. and a second locating half-groove.

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.

A bleed air structure for core machine tests is shown in figures 3-4 and comprises a bleed air pipe mounting section 11, a bleed air pipe sealing section 12, a bleed air pipe outer section 13, a bleed air pipe positioning section 14, a bleed air pipe inner section 15 and a bleed air pipe inserting section 16, wherein welding points are arranged between any two adjacent bleed air pipelines, the two bleed air pipelines can be separately processed during processing, and then the different bleed air pipelines are welded and fixed. The air guide pipe installing section 11 is located at the outer end of the air guide pipe, the air guide pipe inserting section 16 is located at the inner end of the air guide pipe, the air guide pipe sealing section 12 is connected with the air guide pipe installing section 11, the air guide pipe installing section 11 is detachably and fixedly connected with the air guide pipe, a first axial movable sealing structure capable of axially moving along the air guide pipe is connected between the air guide pipe sealing section 12 and a rear power bearing machine box, and a second axial movable sealing structure capable of axially moving along the air guide pipe is connected between the air guide pipe inserting section 16 and the rear power bearing machine box.

The bleed pipe only can dismantle fixed connection between 11 positions of bleed pipe installation section and back bearing machine casket, all adopts non-fixed connection in other positions, and the connected mode that can dismantle fixed connection includes connected modes such as bolt, bolt. When the bleed air pipe is installed, the bleed air pipe is directly inserted into the inner side of the rear bearing machine box from the outer side of the rear bearing machine box, and then the bleed air pipe installation section 11 is fixed to complete installation, so that the installation is convenient; when the bleed air pipe needs to be replaced or repaired, the whole bleed air pipe can be pulled out outwards by opening the fixed position of the bleed air pipe mounting section 11, and the disassembly is convenient. The core machine does not need to be dismounted to finish effective dismounting in the process of dismounting the bleed air pipe, and the use is convenient.

Through setting up portable structure of obturating of first axial and the portable structure of obturating of second axial, the bleed pipe is accomplished the back in the installation, carries out the obturating to bleed pipe outer end through the portable structure of obturating of first axial, carries out the obturating to bleed pipe inner through the portable structure of obturating of second axial, and the bleed pipe is inseparable in the use, can not take place revealing, job stabilization of air conditioning.

The outer end of bleed pipe is for being close to the outside one end of back bearing machine casket in this application, and the inner of bleed pipe is for being close to the inside one end of back bearing machine casket.

The outer bleed pipe section 13 is connected with the seal section 12 of the bleed pipe, the outer bleed pipe section 13 penetrates through the main gas channel, the positioning section 14 of the bleed pipe is connected with the outer bleed pipe section 13 of the bleed pipe, the positioning section 14 of the bleed pipe is arranged between the main gas channel and the inner cavity of the rear power bearing box, the inner bleed pipe section 15 is connected between the positioning section 14 of the bleed pipe and the plug-in section 16 of the bleed pipe, and the inner bleed pipe section 15 is arranged in the inner cavity of the rear power bearing box.

Preferably, the cross section of bleed pipe is oval, compares in the cross section for circular bleed pipe, and the bleed volume of bleed pipe is bigger, and oval structure compares in the fixed more inconvenient of circular structure, but because the bleed pipe of this application only need fix in one end can, consequently can effectively avoid oval bleed pipe fixed inconvenient shortcoming.

Preferably, the mounting structure of the bleed air pipe mounting section 11 comprises an outer flange 17 and a casing mounting seat 18, the outer flange 17 is integrally and coaxially connected to the bleed air pipe mounting section 11, the casing mounting seat 18 is arranged on the rear bearing casing, and the outer flange 17 is in bolted connection with the casing mounting seat 18. The bolt connection between the bleed air pipe and the rear bearing machine box is realized by arranging the outer flange 17 and the box mounting seat 18, and the installation and the disassembly are convenient.

Preferably, the first axially movable sealing structure comprises two sets of limiting rings 19, two sets of limiting sleeves 20 and two sets of sealing rings 21, the two sets of limiting rings 19 are coaxially connected to the sealing section 12 of the bleed pipe along the axial direction of the bleed pipe, the two sets of limiting rings 19 form a first mounting groove by supports, the sealing rings 21 are made of rubber or other soft materials, the sealing rings 21 are mounted in the first mounting groove, the limiting sleeves 20 are arranged on the rear bearing casing outer ring 8 and are coaxially arranged with the bleed pipe, and the outer walls of the limiting rings 19 are attached to the inner walls of the limiting sleeves 20. The sealing ring 21 is oval, can move along the axial direction of the bleed pipe, and can play a sealing effect between the bleed pipe and the rear bearing machine box when reaching the position of the limiting sleeve 20. The limiting ring 19 axially limits the sealing ring 21, the limiting sleeve 20 radially limits the limiting ring 19, and the sealing ring 21 between the limiting ring 19 and the limiting sleeve 20 can effectively seal the rear bearing casing and the gas guide pipe to prevent leakage of the outside culvert gas, and the air guide pipe has axial, circumferential and radial deformation capacities and is high in thermal deformation coordination capacity.

Preferably, the second axially movable sealing structure comprises support sleeves 22, sealing rubber rings 23 and a sealing mechanism, the support sleeves 22 are integrally and coaxially connected to the air entraining pipe insertion section 16, at least two groups of support sleeves 22 are arranged, at least one group of sealing rubber ring 23 is arranged in each group, and each group of sealing rubber ring 23 is arranged between two adjacent groups of support sleeves 22; the sealing mechanism is arranged on the rear bearing casing, and a sealing sleeve 24 sleeved outside the support sleeve 22 and the sealing rubber ring 23 is arranged on the sealing mechanism. Support sleeve 22 sets up three groups in this application, and sealed rubber ring 23 is oval, sets up to two sets of, and sealed rubber ring 23 can remove along bleed pipe's axial, when reacing sealing mechanism position, can realize the seal between bleed pipe and the back bearing machine casket. The supporting sleeve 22 axially limits the sealing ring 21, the sealing sleeve 24 radially limits the supporting sleeve 22, and the sealing ring 21 effectively seals the space between the rear bearing casing and the bleed air pipe under the limitation of the supporting sleeve 22 and the sealing sleeve 24, so that the leakage of the external-contained gas is prevented, and the radial deformation capability and the thermal deformation coordination capability are strong.

Preferably, the sealing mechanism further comprises a first support frame 25 connected to one side of the sealing sleeve 24 and a second support frame 26 connected to the other side of the sealing sleeve 24, the first support frame 25 is in bolted connection with a bearing seat of the rear bearing casing, and the second support frame 26 is in bolted connection with the cover plate 10 on the rear bearing casing; the first support frame 25 is provided with a first fixing plate arranged along the axial direction of the air guide pipe, the second support frame 26 is provided with a second fixing plate arranged along the axial direction of the air guide pipe, the first fixing plate and the second fixing plate are mutually attached, and a fastening bolt 27 for fixing the first fixing plate and the second fixing plate is connected between the first fixing plate and the second fixing plate.

The sealing sleeve 24 is formed by arranging a first support frame 25 and a second support frame 26, the first support frame 25 and the second support frame 26 ensure the sealing stability of the sealing sleeve 24 by being fixed on the bearing seat and the cover plate 10 respectively, and the support strength of the first support frame 25 and the second support frame 26 is ensured by arranging a fastening bolt 27.

As shown in fig. 4-5, preferably, a positioning ring 28 is disposed on the bleed air pipe positioning section 14, the positioning ring 28 is oval, a bleed air pipe mounting seat is disposed on an outer side of the positioning ring 28, the bleed air pipe mounting seat includes a left half mounting seat 29 and a right half mounting seat 30, a first positioning half groove 31 is disposed in the left half mounting seat 29, a second positioning half groove 32 is disposed in the right half mounting seat, the first positioning half groove 31 and the second positioning half groove 32 are respectively in clamping fit with two sides of the positioning ring 28, and the left half mounting seat 29 and the right half mounting seat 30 are connected with a rear bearing box bolt. Carry out the joint through setting up half left mount pad 29 and half right mount pad 30 and fix oval-shaped holding ring 28, holding ring 28 can prevent that back bearing machine casket inner chamber gas from revealing to the radial position of restriction bleed pipe has circumference and axial deformability simultaneously, simple to operate simultaneously, and half left mount pad 29 and half right mount pad 30 can accomplish the joint fixed to holding ring 28.

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 core machine is bleed structure for experiment which characterized in that: comprises a bleed air pipe mounting section (11), a bleed air pipe sealing section (12) and a bleed air pipe inserting section (16); bleed pipe installing section (11) are located the outer end of bleed pipe, bleed pipe grafting section (16) are located the inner of bleed pipe, bleed pipe section (12) of obturating links to each other with bleed pipe installing section (11), fixed connection can be dismantled with bleed pipe to bleed pipe installing section (11), be connected with the portable structure of obturating of the first axial that can follow bleed pipe axial displacement between bleed pipe section (12) of obturating and the back power receiver casket, be connected with the portable structure of obturating of the second axial that can follow bleed pipe axial displacement between bleed pipe grafting section (16) and the back power receiver casket.

2. The air-entraining structure for testing the core engine according to claim 1, wherein: the cross section of the air guide pipe is oval.

3. The air-entraining structure for testing the core engine according to claim 1, wherein: the mounting structure of the bleed air pipe mounting section (11) comprises an outer flange (17) and a casing mounting seat (18), the outer flange (17) is integrally and coaxially connected to the bleed air pipe mounting section (11), the casing mounting seat (18) is arranged on a rear bearing casing, and the outer flange (17) is in bolt connection with the casing mounting seat (18).

4. The air-entraining structure for testing the core engine according to claim 1, wherein: the first movable axial sealing structure comprises a limiting ring (19), a limiting sleeve (20) and a sealing ring (21), wherein the limiting ring (19) is divided into two groups, the two groups of limiting rings (19) are coaxially connected to a sealing section (12) of the bleed air pipe along the axial direction of the bleed air pipe, two groups of limiting ring (19) supports form a first mounting groove, the sealing ring (21) is mounted in the first mounting groove, the limiting sleeve (20) is arranged on a rear bearing case and coaxially arranged with the bleed air pipe, and the outer wall of the limiting ring (19) is attached to the inner wall of the limiting sleeve (20).

5. The air-entraining structure for testing the core engine according to claim 1, wherein: the second axial movable sealing structure comprises support sleeves (22), sealing rubber rings (23) and a sealing mechanism, the support sleeves (22) are integrally and coaxially connected to the air guide pipe insertion section (16), at least two groups of support sleeves (22) are arranged, at least one group of sealing rubber ring (23) is arranged in each group, and each group of sealing rubber ring (23) is arranged between two adjacent groups of support sleeves (22); the sealing mechanism is arranged on the rear bearing casing, and a sealing sleeve (24) sleeved outside the support sleeve (22) and the sealing rubber ring (23) is arranged on the sealing mechanism.

6. The air-entraining structure for testing the core engine according to claim 5, wherein: the sealing mechanism further comprises a first support frame (25) connected to one side of the sealing sleeve (24) and a second support frame (26) connected to the other side of the sealing sleeve (24), the first support frame (25) is in bolted connection with a bearing seat of the rear power bearing box, and the second support frame (26) is in bolted connection with a cover plate (10) on the rear power bearing box; be equipped with on first support frame (25) along the first fixed plate of bleed pipe axial setting, be equipped with on second support frame (26) along the second fixed plate of bleed pipe axial setting, first fixed plate and second fixed plate laminate each other and be connected with between first fixed plate and the second fixed plate and carry out fastening bolt (27) fixed to both.

7. The air-entraining structure for testing the core engine according to claim 1, wherein: the device also comprises an outer section (13) of the bleed air pipe, a positioning section (14) of the bleed air pipe and an inner section (15) of the bleed air pipe; the outer gas guide pipe section (13) is connected with the sealing section (12) of the gas guide pipe, the outer gas guide pipe section (13) penetrates through the main gas channel, the positioning section (14) of the gas guide pipe is connected with the outer gas guide pipe section (13), the positioning section (14) of the gas guide pipe is arranged between the main gas channel and the inner cavity of the rear power bearing machine box, the inner gas guide pipe section (15) is connected between the positioning section (14) of the gas guide pipe and the inserting section (16) of the gas guide pipe, and the inner gas guide pipe section (15) is arranged in the inner cavity of the rear power bearing machine box;

be equipped with holding ring (28) on bleed pipe location section (14), the outside of holding ring (28) is equipped with the bleed pipe mount pad, the bleed pipe mount pad includes half mount pad (29) on a left side and half mount pad (30) on the right side, seted up half groove (31) in first location in half mount pad (29) on a left side, seted up half groove (32) in second location in half right side mounting groove, half groove (31) in first location and half groove (32) in second location cooperate with the both sides joint of holding ring (28) respectively, half mount pad (29) on a left side and half mount pad (30) on the right side and rear bearing machine box bolted connection.