Structural compensator with air film cooling heat screen

Abstract

The utility model discloses a structure compensator with an air film cooling heat shield, which comprises a front flange, and a rear flange is arranged on the opposite side of the front flange. By arranging a front flange, a rear flange, a connecting assembly, a front guide cylinder, a rear guide cylinder, a front heat shield, a rear heat shield and a corrugated pipe, when the interiors of the front heat shield and the rear heat shield are deformed due to high-temperature fuel gas, the deformation stress of the front heat shield and the rear heat shield is released through supporting lugs between the front heat shield and the rear heat shield and between the front flange and the rear flange; when the corrugated pipe bears circumferential compression and stretching, the front heat screen, the rear heat screen, the front guide cylinder and the rear guide cylinder can move relatively, and meanwhile, the front guide cylinder and the rear guide cylinder can greatly reduce the flow resistance of cold air flow, so that the cooling efficiency is improved, strong pressure pulse in combustion of the engine can be slowed down, and the service life of the engine is prolonged. And meanwhile, the combustion chamber barrel can be insulated and cooled, and deformation is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation engines, in particular to a structural compensator with an air film cooling and heat insulation screen. Background Art

[0002] In order to ensure the reliability and service life of the engine combustion chamber, the outer wall of the combustion chamber must be cooled. As a highly efficient cooling technology, the cooling technology of the heat shield has developed rapidly. From the earliest flat plate (cylindrical) heat shield to the transverse corrugated heat shield, and then to the now widely used longitudinal corrugated heat shield, it has achieved good results in reducing wall temperature and reducing thermal stress.

[0003] The earliest heat shields were flat, also called cylindrical, with slots along their axial cross-section at the junctions between each segment to allow cooling air to pass through. The film holes in these early cylindrical shields primarily absorbed the energy of pressure pulsations and prevented oscillatory combustion. However, for modern high-performance afterburners, the overall film cooling efficiency of the heat shield is low, necessitating additional cooling air, which cannot meet the requirements of advanced afterburner technology.

[0004] The afterburner is a critical component of advanced military aircraft engines, significantly enhancing the instantaneous thrust and maneuverability of military aircraft. However, in afterburner mode, the combustion gases in the afterburner reach temperatures as high as 2300K, far exceeding the maximum heat resistance of the afterburner's metal barrel. The combustor also generates additional thrust by mixing residual oxygen from the turbine exhaust with air in the duct. The airflow at the tail of the combustor is characterized by low pressure, high velocity, and a harsh operating environment, resulting in intense pressure pulses during combustion. Furthermore, compared to the main combustor and turbine components, the tail of the combustor experiences higher temperatures, a larger wall cooling area, less cooling air, and severe thermal deformation. Summary of the Invention

[0005] The main purpose of the utility model is to provide a structural compensator with an air film cooling and heat insulation screen.

[0006] The purpose of the utility model can be achieved by adopting the following technical solutions:

[0007] A structural compensator with an air film cooling heat insulation screen includes a front flange, a rear flange is provided on the opposite side of the front flange, multiple groups of connecting holes are equidistantly provided at the bottom ends of the front flange and the rear flange, and a connecting assembly is installed in each group of the connecting holes, a front guide tube is installed on the connecting assembly, a rear guide tube is connected to one side of the front guide tube, a front heat insulation screen is installed at the bottom end of the connecting assembly, and a rear heat insulation screen is provided on one side of the front heat insulation screen, and a bellows is fixed between the front flange and the rear flange.

[0008] Preferably, the front flange and the rear flange are provided with multiple groups of mounting holes at equal distances on a side wall away from the front flange.

[0009] Preferably, the connecting assembly includes a connecting bolt threadedly connected to the connecting hole, and a gasket is sleeved on the outer side of the connecting bolt.

[0010] Preferably, a lug is provided at the top of the bottom end of the connecting bolt, the lug is an I-shaped structure, and the connecting bolt passes through the lug, the front guide tube is located between the gasket and the lug, and the front guide tube overlaps the rear guide tube.

[0011] Preferably, the lug is connected to the front heat shield bolt, and the lug is connected to the rear heat shield.

[0012] Preferably, the front heat insulation screen is a Y-shaped structure, and the rear heat insulation screen overlaps the Y-shaped opening of the front heat insulation screen.

[0013] Preferably, the cross-section of the bellows is a double U-shaped structure, and both ends of the bellows are welded to the front flange and the rear flange.

[0014] Preferably, the front heat shield and the heat shield are both provided with multiple groups of through holes at equal intervals.

[0015] The beneficial technical effects are:

[0016] By arranging a front flange, a rear flange, a connecting assembly, a front guide tube, a rear guide tube, a front heat insulation screen, a rear heat insulation screen and a bellows, the front heat insulation screen and the front flange, as well as the rear heat insulation screen and the rear flange are connected by thin-walled "X"-shaped lugs and connecting bolts. When the interior of the front heat insulation screen and the rear heat insulation screen is deformed by high-temperature combustion gas, the deformation stress of the front heat insulation screen and the rear heat insulation screen is released through the lugs between the front heat insulation screen and the rear heat insulation screen and the front flange and the rear flange, and the bellows are subjected to circumferential compression and tension. Similarly, the front heat insulation screen, the rear heat insulation screen, the front guide tube and the rear guide tube will also undergo relative movement. At the same time, the front guide tube and the rear guide tube will greatly reduce the flow resistance of the cold airflow, thereby improving the cooling efficiency, and can slow down the strong pressure pulses accompanied by engine combustion. At the same time, it can also have a heat-insulating and cooling effect on the combustion chamber cylinder to prevent deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of a preferred embodiment of a structural compensator with an air film cooling and heat insulation screen according to the utility model;

[0018] Figure 2 A main cross-sectional view of a preferred embodiment of a structural compensator with an air film cooling and heat insulation screen according to the utility model;

[0019] Figure 3It is a right sectional view of a preferred embodiment of a structural compensator with an air film cooling heat shield according to the utility model;

[0020] Figure 4 A preferred embodiment of a structural compensator with air film cooling and heat insulation screen according to the utility model Figure 2 Enlarged view of point A in the middle.

[0021] The following are the descriptions of the reference numerals:

[0022] 1. Front flange; 2. Rear flange; 3. Mounting hole; 4. Connection hole; 5. Connection assembly; 501. Connection bolt; 502. Gasket; 503. Support lug; 6. Front guide tube; 7. Rear guide tube; 8. Front heat shield; 9. Rear heat shield; 10. Bellows; 11. Through hole. Implementation Method

[0023] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is described in further detail below with reference to embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0024] like Figure 1-Figure 4 As shown, the present embodiment provides a structural compensator with an air film cooling heat insulation screen, comprising a front flange 1, a rear flange 2 being provided on the opposite side of the front flange 1, for convenient connection of the combustion chambers through the front flange 1 and the rear flange 2, a plurality of groups of connecting holes 4 being equidistantly provided at the bottom ends of the front flange 1 and the rear flange 2, for convenient connection of the connecting component 5 with the front flange 1 and the rear flange 2 through the connecting holes 4, and a connecting component 5 being installed in each group of connecting holes 4, a front guide tube 6 being installed on the connecting component 5, a rear guide tube 7 being connected to one side of the front guide tube 6, the flow resistance of the cold air flow being greatly reduced by the front guide tube 6 and the rear guide tube 7, thereby improving the cooling efficiency, a front heat insulation screen 8 being installed at the bottom end of the connecting component 5, and a rear heat insulation screen 9 being provided on one side of the front heat insulation screen 8, heat insulation treatment being performed by the front heat insulation screen 8 and the rear heat insulation screen 9, and a bellows 10 being fixed between the front flange 1 and the rear flange 2.

[0025] like Figure 1-Figure 2 As shown, a plurality of groups of mounting holes 3 are evenly spaced apart on one side wall of the front flange 1 and the rear flange 2 away from each other, so as to facilitate connection of the front flange 1 and the rear flange 2 with the combustion chamber through the mounting holes 3 .

[0026] like Figure 2-Figure 4 As shown, the connection assembly 5 includes a connection bolt 501 threadedly connected to the connection hole 4, and a gasket 502 is sleeved on the outside of the connection bolt 501, which can prevent the connection bolt 501 from loosening.

[0027] like Figure 2-Figure 4As shown, a lug 503 is provided at the top of the bottom end of the connecting bolt 501. The lug 503 is a "F"-shaped structure, and the connecting bolt 501 passes through the lug 503. The front guide tube 6 is located between the gasket 502 and the lug 503. The front guide tube 6 overlaps with the rear guide tube 7, making it convenient to install the front guide tube 6 and the rear guide tube 7 on the front flange 1 and the rear flange 2 respectively through the connecting bolt 501.

[0028] like Figure 2-Figure 4 As shown, the lug 503 is connected to the front heat shield 8 by bolts, and the lug 503 is connected to the rear heat shield 9. The front heat shield 8 and the rear heat shield 9 can be connected to the lug 503 respectively, thereby fixing the two.

[0029] like Figure 2-Figure 4 As shown, the front heat insulation screen 8 is a Y-shaped structure, and the rear heat insulation screen 9 overlaps the Y-shaped opening of the front heat insulation screen 8, so that the gap between the front heat insulation screen 8 and the rear heat insulation screen 9 can be changed within a small range, the cooling flow loss is small, and the front heat insulation screen 8 and the rear heat insulation screen 9 structure are more stable after being loaded.

[0030] like Figure 2-Figure 4 As shown, the cross section of the bellows 10 is a double U-shaped structure, and both ends of the bellows 10 are welded to the front flange 1 and the rear flange 2. The bellows 10 can withstand circumferential compression and tension.

[0031] like Figure 1-Figure 3 As shown, multiple groups of through holes 11 are evenly spaced on the front heat insulation screen 8 and the heat insulation screen to facilitate airflow through the through holes 11 .

[0032] Working principle of this device: When this device is used, the two sides of the bellows 10 are welded to the front flange 1 and the rear flange 2 respectively, and then the front guide tube 6, the rear guide tube 7, the front heat insulation screen 8 and the rear heat insulation screen 9 are respectively connected and fixed using the connecting assembly 5. After the fixing is completed, the front flange 1 and the rear flange 2 are connected to the combustion chamber through the mounting hole 3. During use, the bellows 10 can withstand circumferential compression and tension. When the interior of the front heat insulation screen 8 and the rear heat insulation screen 9 are deformed by high-temperature combustion gas, the front heat insulation screen 8 and the rear heat insulation screen 9 are released through the support ears 503 between the front heat insulation screen 8 and the rear heat insulation screen 9 and the front flange 1 and the rear flange 2. 9 deformation stress, and the bellows 10 is subjected to circumferential compression and tension. Similarly, the front heat shield 8, the rear heat shield 9, the front guide tube 6 and the rear guide tube 7 will also move relative to each other. At the same time, the front guide tube 6 and the rear guide tube 7 will greatly reduce the flow resistance of the cold air flow, thereby improving the cooling efficiency, and can slow down the strong pressure pulses accompanied by engine combustion. At the same time, it can also have a heat-insulating and cooling effect on the combustion chamber cylinder to prevent deformation. The rear heat shield 9 is overlapped in the middle of the front heat shield 8, which can make the gap between the front heat shield 8 and the rear heat shield 9 change within a small range, and the cooling flow loss is small, so that the front heat shield 8 and the rear heat shield 9 structure are more stable after being loaded.

[0033] The above are only further embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the scope disclosed by the present invention based on the technical solution and concept of the present invention, which fall within the protection scope of the present invention.

Claims

1. A structural compensator with air film cooling and heat insulation screen, characterized by: The invention comprises a front flange (1), a rear flange (2) is provided on the opposite side of the front flange (1), a plurality of groups of connection holes (4) are provided at equal intervals on the bottom ends of the front flange (1) and the rear flange (2), and a connection assembly (5) is installed in each group of the connection holes (4), a front guide tube (6) is installed on the connection assembly (5), one side of the front guide tube (6) is connected to the rear guide tube (7), a front heat insulation screen (8) is installed on the bottom end of the connection assembly (5), and a rear heat insulation screen (9) is provided on one side of the front heat insulation screen (8), and a bellows (10) is fixed between the front flange (1) and the rear flange (2).

2. The structural compensator with film cooling and heat insulation screen according to claim 1, characterized in that: The front flange (1) and the rear flange (2) are provided with multiple groups of mounting holes (3) at equal distances on a side wall away from the front flange (1).

3. The structural compensator with film cooling and heat insulation screen according to claim 2, characterized in that: The connecting assembly (5) comprises a connecting bolt (501) threadedly connected to the connecting hole (4), and a gasket (502) is sleeved on the outside of the connecting bolt (501).

4. The structural compensator with film cooling and heat insulation screen according to claim 3, characterized in that: A lug (503) is provided on the top of the bottom end of the connecting bolt (501), the lug (503) is an "X"-shaped structure, and the connecting bolt (501) passes through the lug (503), the front guide tube (6) is located between the gasket (502) and the lug (503), and the front guide tube (6) is overlapped with the rear guide tube (7).

5. The structural compensator with film cooling and heat insulation screen according to claim 4, characterized in that: The support lug (503) is connected to the front heat shield (8) by bolts, and the support lug (503) is connected to the rear heat shield (9).

6. The structural compensator with film cooling and heat insulation screen according to claim 5, characterized in that: The front heat insulation screen (8) is a Y-shaped structure, and the rear heat insulation screen (9) is overlapped with the Y-shaped opening of the front heat insulation screen (8).

7. The structural compensator with film cooling and heat insulation screen according to claim 1, characterized in that: The cross section of the bellows (10) is a double U-shaped structure, and both ends of the bellows (10) are welded to the front flange (1) and the rear flange (2).

8. The structural compensator with film cooling and heat insulation screen according to claim 1, characterized in that: Multiple groups of through holes (11) are equidistantly mounted on the front heat insulation screen (8) and the heat insulation screen.

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