An integral heat insulation screen for an aircraft brake wheel

Abstract

The present invention belongs to the technical field of aviation brake wheels, and particularly relates to an integral heat insulation screen for an aviation brake wheel. It includes: an inner heat insulation screen, an outer heat insulation screen, a heat insulation layer, a plurality of isolation pads and a plurality of reinforcing plates; the heat insulation layer and the inner heat insulation screen are installed inside the outer heat insulation screen, the heat insulation layer is in the cavity between the inner heat insulation screen and the outer heat insulation screen, and is clamped by the semi-circular platforms on the inner heat insulation screen and the outer heat insulation screen, dividing one cavity into two cavities; the heat protection area of the hub wall of the wheel assembly is increased to 100%.

Description

Technical Field

[0001] The present invention belongs to the technical field of aircraft brake wheels, and particularly relates to an integral heat insulation screen for aircraft brake wheels. Background Art

[0002] An aircraft brake wheel is installed on an aircraft landing gear and consists of a wheel assembly and a brake device. A tire is sleeved outside the wheel assembly and rolls along with the aircraft; during braking, the brake device converts the kinetic energy of the aircraft into heat energy, which is dissipated through heat radiation or heat transfer. The wheel and the tire are outside the brake device and absorb part of the heat, and the temperature of the gas inside the wheel and the tire will increase. According to the Clapeyron equation, the pressure inside the tire will increase. In order to prevent the tire pressure from being too high and causing a burst, a thermal sensitive device is mostly designed on the wheel assembly. When the temperature of the wheel is too high, the tire pressure is released.

[0003] With the improvement of modern aircraft design requirements, the kinetic energy of the aircraft converted by the brake wheel is increasing, the temperature of the brake device is getting higher and higher, resulting in a higher temperature of the wheel. The frequency of replacing the thermal sensitive device during the use of the brake wheel has increased significantly. At the same time, as the temperature of the wheel increases, the fatigue strength of the metal matrix will be reduced, and the service life will be shortened.

[0004] A commonly used method to reduce the temperature of the wheel is to add a heat insulation screen design on the hub wall of the wheel assembly to reduce the heat radiation and heat transfer from the brake device to the wheel assembly. Currently, the publicly disclosed patents are all single-piece heat insulation screens. The single-piece heat insulation screen is installed between the boss of the wheel guide rail. There is a gap between each heat insulation screen, and the width of the gap is equal to the width of the guide rail boss. Therefore, the heat protection area of the single-piece heat insulation screen reaches at most 85% of the hub wall of the wheel. Summary of the Invention

[0005] The purpose of the present invention is: to improve the heat protection ability of the aircraft brake wheel assembly, the present invention discloses an integral heat insulation screen, which increases the heat protection area of the hub wall of the wheel assembly to 100%.

[0006] The technical solution of the present invention is:

[0007] An integral heat insulation screen for an aircraft brake wheel is applied to the structure of the upper beam type guide rail of the wheel. The integral heat insulation screen includes: an inner heat insulation screen 1, an outer heat insulation screen 2, a heat insulation layer 3, a plurality of isolation pads 4 and a plurality of reinforcing plates 5; the inner heat insulation screen 1 is formed by stamping a thin-wall stainless steel plate and then wound into a straight cylinder shape, and the outer heat insulation screen 2 is formed by stamping a thin-wall stainless steel plate and then wound into a cylinder shape, and the cross-sectional shape of the cylinder wall is approximately hat-shaped.

[0008] The heat insulation layer 3 and the inner heat insulation screen 1 are installed inside the outer heat insulation screen 2. The heat insulation layer 3 is located in the cavity between the inner heat insulation screen 1 and the outer heat insulation screen 2, and is clamped by the semi-cylindrical platforms on the inner heat insulation screen 1 and the outer heat insulation screen 2, dividing one cavity into two cavities;

[0009] The square groove of the heat insulation layer 3 overlaps with the square holes of the outer heat insulation screen 2 and the inner heat insulation screen 1. A plurality of the reinforcing plates are installed on the shorter side of the brim of the outer heat insulation screen 2 and cover one end of the inner heat insulation screen 1. The wider end of the brim of the outer heat insulation screen 2 is welded to the inner heat insulation screen 1. The shorter end of the brim of the outer heat insulation screen 2 is welded to the inner heat insulation screen 1 and the reinforcing plate 5. The isolation pad 4 is installed in the hole of the outer heat insulation screen 2.

[0010] The characteristics and further improvements of the technical solution of the present invention are as follows:

[0011] (1) The inner heat insulation screen is formed by stamping a thin-walled stainless steel plate and then wound into a straight cylinder shape and welded. The weld joints are evenly distributed with welding points; the inner diameter of the cylinder wall is smaller than the inner diameter of the cap top of the outer heat insulation screen, so as to form a cavity with the outer heat insulation screen; the width of the cylinder shape is shorter than the cavity depth of the wheel assembly and does not contact the transfer part at the bottom of the wheel abdominal cavity; a plurality of square holes are evenly distributed near the edge at one end of the cylinder for fixing the integral heat insulation screen; the number of the square holes is the same as the number of the beam-type guide rails on the wheel assembly, and the size of the square holes is larger than the square bosses on the beam-type guide rails; multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, and the direction of the semi-cylindrical platforms deviates from the center of the cylinder, for jointly clamping the heat insulation layer with the semi-cylindrical platforms on the cylinder wall of the outer heat insulation screen, and the radius of the semi-cylindrical platforms is less than 1 / 2 of the difference between the radii of the middle parts of the cylinder walls of the inner heat insulation screen and the outer heat insulation screen.

[0012] (2) The outer heat insulation screen is formed by stamping a thin-walled stainless steel plate into a cylindrical shape and then welding it. Solder joints are evenly distributed at the connection points. The cross-sectional shape of the cylinder wall is approximately hat-shaped. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The inner diameter of the brim of the outer heat insulation screen is larger than the diameter of the cylinder wall of the inner heat insulation screen. The diameter of the cap top is larger than the inner diameter of the inner heat insulation screen and smaller than the diameter of the bottom of the wheel hub, forming a cavity with the inner heat insulation screen. The width of the cylindrical shape is shorter than the depth of the cavity of the wheel assembly, does not contact the transfer part at the bottom of the wheel abdominal cavity, and is the same as the width of the cylindrical shape of the inner heat insulation screen. Multiple square holes are evenly distributed at the wider end of the brim. The number of the square holes is the same as the number of beam-type guide rails on the wheel assembly. The size of the square holes is the same as the size of the square holes above the inner heat insulation screen, and is used to fix the integral heat insulation screen assembly. Multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, with the direction of the semi-cylindrical platforms facing the center of the cylinder, and are used to jointly clamp the heat insulation layer with the semi-cylindrical platforms on the cylinder wall of the inner heat insulation screen. The radius of the semi-cylindrical platform is less than 1 / 2 of the difference in the cylinder wall radius between the middle parts of the inner heat insulation screen and the outer heat insulation screen. At least two rows of holes are evenly distributed on the cylinder wall for installing the isolation pad, and the hole diameter is larger than the waist diameter of the isolation pad. The narrower end of the brim is used to install the reinforcing plate.

[0013] (3) The heat insulation layer is formed by bending a thin-walled stainless steel plate into a straight cylindrical shape and then welding it. Solder joints are evenly distributed at the connection points. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The diameter of the cylinder wall is equal to the sum of the inner diameter of the inner heat insulation screen and the diameter of the small convex platform. The width of the cylindrical shape is shorter than the width of the cylindrical shape of the inner heat insulation screen. Square grooves are evenly distributed at one end of the cylinder. The number of the square grooves is the same as the number of square holes on the inner heat insulation screen and the outer heat insulation screen. The width of the square grooves is larger than the width of the square holes above the inner heat insulation screen. The depth of the square grooves is larger than the length of the square holes above the inner heat insulation screen, so as to be installed in the cavity between the inner heat insulation screen and the outer heat insulation screen, avoiding the square holes of the inner heat insulation screen and the outer heat insulation screen.

[0014] (4) The isolation pad is an I-shaped structure made of high-temperature resistant rubber. The waist diameter of the I-shaped structure is smaller than the size of the installation hole on the outer heat insulation screen. The waist width is wider than the thickness of the plate material of the outer heat insulation screen. The diameter of the I-shaped head is larger than the waist diameter. The thickness of the part of the I-shaped head inserted into the hole of the outer heat insulation screen is greater than 1 mm and less than 1 / 2 of the difference in the cylinder wall radius between the inner heat insulation screen and the outer heat insulation screen.

[0015] (5) The reinforcing plate is an arc-shaped plate, and the cross-section is a U-shaped formed by symmetrically bending a thin plate. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The opening width of the U-shaped is equal to 2 times the thickness of the thin plate of the inner heat insulation screen.

[0016] (6) The integral heat insulation screen is installed in the wheel abdominal cavity and fixed using beam-type guide rails. Except for the square hole part, the beam-type guide rails do not contact the integral heat insulation screen.

[0017] (7) The small end of the beam-type guide rail is inserted into the hole at the bottom of the hub, and the large end connects the beam-type guide rail and the hub through bolts. The integral heat insulation screen is clamped between the beam-type guide rail and the hub.

[0018] There is an isolation pad between the integral heat insulation screen provided by the present invention and the hub wall of the machine wheel, which can prevent the direct contact between the heat insulation screen and the hub wall of the machine wheel and reduce the heat transfer between the heat insulation screen and the machine wheel assembly. The inner heat insulation screen, the outer heat insulation screen and the heat insulation layer of the integral heat insulation screen assembly form two cavities filled with air in the middle, which can slow down the rate of heat radiation. The integral heat insulation screen improves the heat protection area. Compared with the traditional single-piece heat insulation screen, the protection area is increased by at least 15% and reaches 100%, which can reduce the heat radiation from the braking device to the machine wheel assembly, effectively reduce the temperature of the machine wheel assembly, and significantly improve the heat protection effect. Description of the Drawings

[0019] Figure 1 is the structural schematic diagram of the inner heat insulation screen Figure 1 ;

[0020] Figure 2 is the structural schematic diagram of the inner heat insulation screen Figure 2 ;

[0021] Figure 3 is the structural schematic diagram of the inner heat insulation screen Figure 3 ;

[0022] Figure 4 is the structural schematic diagram of the inner heat insulation screen Figure 4 ;

[0023] Figure 5 is the structural schematic diagram of the outer heat insulation screen Figure 1 ;

[0024] Figure 6 is the structural schematic diagram of the outer heat insulation screen Figure 2 ;

[0025] Figure 7 is the structural schematic diagram of the outer heat insulation screen Figure 3 ;

[0026] Figure 8 is the structural schematic diagram of the outer heat insulation screen Figure 4 ;

[0027] Figure 9 is the structural schematic diagram of the heat insulation layer Figure 1 ;

[0028] Figure 10 is the structural schematic diagram of the heat insulation layer Figure 2 ;

[0029] Figure 11 is the structural schematic diagram of the isolation pad Figure 1 ;

[0030] Figure 12 It is a schematic structure of the isolation pad Figure 2 ;

[0031] Figure 13 It is a schematic structure of the isolation pad Figure 3 ;

[0032] Figure 14 It is a schematic structure diagram of the reinforcement plate;

[0033] Figure 15 It is an assembly schematic of the integral heat insulation screen assembly Figure 1 ;

[0034] Figure 16 It is an assembly schematic of the integral heat insulation screen assembly Figure 2 ;

[0035] Figure 17 It is an assembly schematic of the integral heat insulation screen assembly Figure 3 ;

[0036] In the figure: 1. Inner heat insulation screen; 2. Outer heat insulation screen; 3. Heat insulation layer; 4. Isolation pad; 5. Reinforcement plate;

[0037] Figure 18 It is an installation schematic of the integral heat insulation screen assembly on the wheel assembly Figure 1 ;

[0038] Figure 19 It is an installation schematic of the integral heat insulation screen assembly on the wheel assembly Figure 2 ;

[0039] In the figure: 6. Integral heat insulation screen; 7. Beam type guide rail;

[0040] Figure 20 It is the wheel temperature change curve when a certain type of brake wheel uses a single-piece heat insulation screen during operation;

[0041] Figure 21 It is the wheel temperature change curve when a certain type of brake wheel uses an integral heat insulation screen assembly during operation. Specific embodiments

[0042] The following further describes the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0043] This embodiment is an integral heat insulation screen assembly for a certain type of brake wheel, including an inner heat insulation screen 1, an outer heat insulation screen 2, a heat insulation layer 3, 18 isolation pads 4 and 4 reinforcement plates 5.

[0044] Such as Figures 1 - 4As shown in the figure, the inner heat insulation screen 1 is formed by stamping a thin-walled stainless steel plate and then winding it into a straight cylinder shape and welding it. The joints are evenly distributed with welding points. The inner diameter of the cylinder wall is more than 4 mm smaller than the inner diameter of the cap top of the outer heat insulation screen 2, and is used to form a cavity with the outer heat insulation screen 2. The width of the cylinder shape is more than 2 mm shorter than the cavity depth of the wheel assembly and cannot contact the transfer part at the bottom of the wheel abdominal cavity. Multiple square holes are evenly distributed near the edge at one end of the cylinder, which are used to fix the heat insulation screen assembly 6. The number of the square holes is the same as the number of the beam-type guide rails 7 on the wheel assembly, and the size of the square holes is slightly larger than the square bosses on the beam-type guide rails 7 for convenient installation. Multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, and the direction of the semi-cylindrical platforms deviates from the center of the cylinder, which is used to jointly clamp the heat insulation layer 3 with the semi-cylindrical platforms on the cylinder wall of the outer heat insulation screen 2. The radius of the semi-cylindrical platforms is slightly less than 1 / 2 of the difference between the radii of the cylinder walls of the inner heat insulation screen 1 and the outer heat insulation screen 2.

[0045] In this embodiment, the thickness of the sheet material used for the inner heat insulation screen 1 is 0.3 mm, the width is 255 mm, the diameter of the formed cylinder wall is 490 mm, 9 square holes are evenly distributed at one end, 23 mm away from the cylinder edge, the long side of the square holes is 42 mm, and the short side is 34 mm. There are 54 semi-cylindrical platforms R2 mm in total, evenly distributed in 3 rows on the cylinder wall, with a row spacing of 65 mm, and the distance from the center of the first row of semi-cylindrical platforms to the square holes is 28 mm. The width of the welding area is 12 mm.

[0046] As Figures 5 - 8 As shown in the figure, the outer heat insulation screen 2 is formed by stamping a thin-walled stainless steel plate and then winding it into a cylinder shape and welding it. The joints are evenly distributed with welding points, and the cross-sectional shape of the cylinder wall is approximately hat-shaped, and the thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen 1. The inner diameter of the brim of the outer heat insulation screen 2 is slightly larger than the diameter of the cylinder wall of the inner heat insulation screen 1, the diameter of the cap top is more than 4 mm larger than the inner diameter of the inner heat insulation screen 1 and more than 2 mm smaller than the bottom diameter of the hub part, and forms a cavity with the inner heat insulation screen 1. The width of the cylinder shape is more than 2 mm shorter than the cavity depth of the wheel assembly and cannot contact the transfer part at the bottom of the wheel abdominal cavity, and is the same as the width of the cylinder shape of the inner heat insulation screen 1. Multiple square holes are evenly distributed at the wider end of the brim. The number of the square holes is the same as the number of the beam-type guide rails 7 on the wheel assembly, and the size of the square holes is the same as the size of the square holes above the inner heat insulation screen for convenient installation, which is used to fix the heat insulation screen assembly 6. Multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, and the direction of the semi-cylindrical platforms faces the center of the cylinder, which is used to jointly clamp the heat insulation layer 3 with the semi-cylindrical platforms on the cylinder wall of the inner heat insulation screen 1. The radius of the semi-cylindrical platforms is slightly less than 1 / 2 of the difference between the radii of the middle parts of the cylinder walls of the inner heat insulation screen 1 and the outer heat insulation screen 2. At least 2 rows of holes are evenly distributed on the cylinder wall for installing the isolation pad 4, and the hole diameter is slightly larger than the waist diameter of the isolation pad 4. The width of the narrower end of the brim is about 10 mm, which is used to install the reinforcing plate 5.

[0047] In this embodiment, the sheet material of the outer heat insulation screen 2 has a thickness of 0.3 mm, a total width of 255 mm, an inner diameter of 490 mm at the brim part after forming, a width of 25 mm for the long-side brim, a width of 12 mm for the short-side brim, and an inner diameter of 500 mm at the cap top. Nine square holes are evenly distributed at one end of the cylinder wall, 23 mm away from the cylinder edge. The long side of the hole is 42 mm and the short side is 34 mm. There are 54 semi-cylindrical platforms with a radius of R2 mm evenly distributed in 3 rows on the cylinder wall, with a row spacing of 65 mm. The distance from the center of the first row of semi-cylindrical platforms to the square hole is 28 mm. There are 18 holes with a diameter of φ12 mm in 2 rows locally on the cylinder wall, with a row spacing of 110 mm. The distance from the center of the first row of holes to the square hole is 53 mm. The width of the welding area is 12 mm.

[0048] As Figures 9 - 10 shown, the heat insulation layer 3 is formed by bending a thin-walled stainless steel plate into a straight cylinder shape and welding it. Welding points are evenly distributed at the connection. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen 1. The diameter of the cylinder wall is equal to the sum of the inner diameter of the inner heat insulation screen 1 and the diameter of the semi-cylindrical platform. The width of the cylinder shape is more than 40 mm shorter than the width of the cylinder shape of the inner heat insulation screen 1. Square grooves are evenly distributed at one end of the cylinder shape. The number of square grooves is the same as the number of square holes on the inner heat insulation screen 1 and the outer heat insulation screen 2. The width of the square groove is more than 10 mm larger than the width of the square hole on the inner heat insulation screen 1, and the depth of the square groove is more than 5 mm larger than the length of the square hole on the inner heat insulation screen 1, so as to be installed in the cavity between the inner heat insulation screen 1 and the outer heat insulation screen 2 and avoid the square holes of the inner heat insulation screen 1 and the outer heat insulation screen 2.

[0049] In this embodiment, the sheet material of the heat insulation layer 3 has a thickness of 0.3 mm, a total width of 213 mm, a diameter of 494 mm for the formed cylinder wall, and nine square grooves are evenly distributed at one end, with a groove width of 65.2 mm, a groove depth of 41 mm, and a welding area width of 12 mm.

[0050] As Figures 11 - 13 shown, the spacer 4 is an I-shaped structure made of high-temperature resistant rubber. The diameter of the waist of the I-shaped structure is slightly smaller than the size of the mounting hole on the outer heat insulation screen 2. The width of the waist is slightly wider than the thickness of the sheet material of the outer heat insulation screen 2. The diameter of the I-shaped head is more than 5 mm larger than the diameter of the waist. The overall thickness of the I-shaped structure is greater than 4 mm and less than 6 mm. The thickness of the part of the I-shaped head inserted into the outer heat insulation screen hole 2 is greater than 1 mm and less than half of the difference between the radii of the cylinder walls of the inner heat insulation screen 1 and the outer heat insulation screen 2.

[0051] In this embodiment, the material selected for the spacer 4 is 6141 silicone rubber. The diameter of the I-shaped head is 15.2 mm, the diameter of the waist is 10.2 mm, the total thickness is 4.3 mm, the thickness of the part inserted into the outer heat insulation screen hole 2 is 1.5 mm, and the width of the waist is 0.6 mm.

[0052] As Figure 14As shown, the reinforcing plate 5 is an 88° arc plate, and its cross-section is a U-shape symmetrically bent from a thin plate. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen 1. The width of the U-shape is greater than 5 mm and less than 10 mm, and the opening width of the U-shape is equal to twice the thickness of the thin plate of the inner heat insulation screen 1.

[0053] In this embodiment, the number of reinforcing plates 5 required for assembling the heat insulation screen assembly 6 is 4. The thickness of the sheet material used for the reinforcing plate 5 is 0.3 mm, and a U-shape with a width of 6 mm is symmetrically formed. The opening width of the U-shape is 0.6 mm.

[0054] When assembling the integral heat insulation screen assembly 6, as Figures 15 - 17 shown, the heat insulation layer 3 and the inner heat insulation screen 1 are successively installed into the outer heat insulation screen 2. The heat insulation layer 3 is clamped by the semi-circular platforms of the inner heat insulation screen 1 and the outer heat insulation screen 2 in the cavity between the inner heat insulation screen 1 and the outer heat insulation screen 2, dividing one cavity into two cavities. The square groove of the heat insulation layer 3 overlaps with the square holes of the outer heat insulation screen 2 and the inner heat insulation screen 1. Four of the reinforcing plates 5 are installed on the shorter side of the brim of the outer heat insulation screen 2 and cover one end of the inner heat insulation screen 1. The wider end of the brim of the outer heat insulation screen 2 is welded to the inner heat insulation screen 1, and the shorter end of the brim of the outer heat insulation screen 2 is welded to the inner heat insulation screen 1 and the reinforcing plate 5. The isolation pad 4 is installed into the hole of the outer heat insulation screen 2. The integral heat insulation screen assembly 6 of the present invention is assembled.

[0055] When using the present invention, as Figures 18 - 19 shown, the integral heat insulation screen assembly 6 is installed into the wheel abdominal cavity, and the heat insulation screen assembly 6 is fixed by the beam type guide rail 7. Except for the square hole part, the beam type guide rail 7 does not contact the heat insulation screen assembly 6, effectively reducing the heat transfer from the braking device to the wheel assembly.

[0056] There is an isolation pad 4 between the integral heat insulation screen assembly 6 and the wheel hub wall, preventing the direct contact between the heat insulation screen and the wheel hub wall, and being able to reduce the heat transfer between the heat insulation screen and the wheel assembly.

[0057] The inner heat insulation screen 1, the outer heat insulation screen 2 and the heat insulation layer 3 of the integral heat insulation screen assembly 6 form two cavities filled with air in the middle, which can slow down the rate of heat radiation.

[0058] The integral heat insulation screen assembly 6 improves the heat protection area. Compared with the traditional single-piece heat insulation screen, the protection area is increased by at least 15% and reaches 100%, which can reduce the heat radiation from the braking device to the wheel assembly, effectively reduce the temperature of the wheel assembly, and significantly improve the heat protection effect.

[0059] A certain type of braking wheel uses a single-piece heat insulation screen, as shown in the appendix Figure 20As shown, the highest temperature measured at the hub position of the wheel assembly is 175°C. After applying the integral heat shield, as attached Figure 21 As shown, the highest temperature measured at the hub position of the wheel assembly is 163°C, and the thermal protection effect is improved by 6.8%.

Claims

1. An integral heat insulation screen for an aircraft braking wheel, characterized in that, Structure applied to the upper beam-type guide rail of the wheel, the integral heat insulation screen includes: an inner heat insulation screen (1), an outer heat insulation screen (2), a heat insulation layer (3), a plurality of isolation pads (4) and a plurality of reinforcing plates (5); the inner heat insulation screen (1) is formed by stamping a thin-walled stainless steel plate and then wound into a straight cylindrical shape, the outer heat insulation screen (2) is formed by stamping a thin-walled stainless steel plate and then wound into a cylindrical shape, and the cross-sectional shape of the cylinder wall is approximately hat-shaped; The heat insulation layer (3) and the inner heat insulation screen (1) are installed inside the outer heat insulation screen (2), the heat insulation layer (3) is in the cavity between the inner heat insulation screen (1) and the outer heat insulation screen (2), and is clamped by the semi-cylindrical platforms on the inner heat insulation screen (1) and the outer heat insulation screen (2), dividing one cavity into two cavities; The square groove of the heat insulation layer (3) overlaps with the square holes of the outer heat insulation screen (2) and the inner heat insulation screen (1), install a plurality of the reinforcing plates on the side of the outer heat insulation screen (2) with a shorter brim, and cover one end of the inner heat insulation screen (1), the end of the outer heat insulation screen (2) with a wider brim is welded to the inner heat insulation screen (1), the end of the outer heat insulation screen (2) with a shorter brim is welded to the inner heat insulation screen (1) and the reinforcing plate (5), and the isolation pad (4) is installed in the hole of the outer heat insulation screen (2).

2. The integral heat insulation screen for an aviation braking wheel according to claim 1, characterized in that, The inner heat insulation screen is formed by stamping a thin-walled stainless steel plate and then wound into a straight cylindrical shape, and welded, with evenly distributed weld points at the joints; the inner diameter of the cylinder wall is smaller than the inner diameter of the hat top of the outer heat insulation screen, so as to form a cavity with the outer heat insulation screen; the width of the cylindrical shape is shorter than the cavity depth of the wheel assembly and does not contact the transfer part at the bottom of the wheel abdominal cavity; a plurality of square holes are evenly distributed near the edge at one end of the cylinder for fixing the integral heat insulation screen; the number of the square holes is the same as the number of beam-type guide rails on the wheel assembly, and the size of the square holes is larger than the square bosses on the beam-type guide rails; multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, and the direction of the semi-cylindrical platforms deviates from the center of the cylinder, for jointly clamping the heat insulation layer with the semi-cylindrical platforms on the cylinder wall of the outer heat insulation screen, and the radius of the semi-cylindrical platforms is less than 1 / 2 of the difference between the cylinder wall radii of the middle parts of the inner heat insulation screen and the outer heat insulation screen.

3. The integral heat insulation screen for an aviation braking wheel according to claim 2, characterized in that, The outer heat insulation screen is formed by stamping a thin-walled stainless steel plate and then winding it into a cylindrical shape and welding it. The joints are evenly distributed with welding points. The cross-sectional shape of the cylinder wall is approximately hat-shaped. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The inner diameter of the brim of the outer heat insulation screen is larger than the diameter of the cylinder wall of the inner heat insulation screen. The diameter of the cap top is larger than the inner diameter of the inner heat insulation screen and smaller than the diameter of the bottom of the wheel hub, forming a cavity with the inner heat insulation screen. The width of the cylindrical shape is shorter than the cavity depth of the wheel assembly and does not contact the transfer part at the bottom of the wheel abdominal cavity, and is the same as the width of the cylindrical shape of the inner heat insulation screen. Multiple square holes are evenly distributed at the wider end of the brim. The number of the square holes is the same as the number of beam-type guide rails on the wheel assembly. The size of the square holes is the same as the size of the square holes on the inner heat insulation screen, and is used to fix the integral heat insulation screen assembly. Multiple rows of semi-cylindrical platforms are evenly distributed on the cylinder wall, and the direction of the semi-cylindrical platforms is towards the center of the cylinder, and are used to jointly clamp the heat insulation layer with the semi-cylindrical platforms on the cylinder wall of the inner heat insulation screen. The radius of the semi-cylindrical platform is less than 1 / 2 of the difference in the cylinder wall radius between the middle parts of the inner heat insulation screen and the outer heat insulation screen. At least two rows of holes are evenly distributed on the cylinder wall for installing the isolation pad, and the hole diameter is larger than the waist diameter of the isolation pad. The narrower end of the brim is used to install the reinforcing plate.

4. The integral heat insulation screen for an aviation braking wheel according to claim 3, characterized in that, The heat insulation layer is formed by bending a thin-walled stainless steel plate into a straight cylindrical shape and welding it. The joints are evenly distributed with welding points. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The diameter of the cylinder wall is equal to the sum of the inner diameter of the inner heat insulation screen and the diameter of the small convex platform. The width of the cylindrical shape is shorter than the width of the cylindrical shape of the inner heat insulation screen. Square grooves are evenly distributed at one end of the cylindrical shape. The number of the square grooves is the same as the number of square holes on the inner heat insulation screen and the outer heat insulation screen. The width of the square grooves is larger than the width of the square holes on the inner heat insulation screen. The depth of the square grooves is larger than the length of the square holes on the inner heat insulation screen for installation in the cavity between the inner heat insulation screen and the outer heat insulation screen, avoiding the square holes of the inner heat insulation screen and the outer heat insulation screen.

5. The integral heat insulation screen for an aviation braking wheel according to claim 4, characterized in that, The isolation pad is an I-shaped structure made of high-temperature resistant rubber. The waist diameter of the I-shaped structure is smaller than the size of the installation holes on the outer heat insulation screen. The waist width is wider than the thickness of the sheet material of the outer heat insulation screen. The diameter of the I-shaped head is larger than the waist diameter. The thickness of the part of the I-shaped head inserted into the holes of the outer heat insulation screen is greater than 1 mm and less than 1 / 2 of the difference in the cylinder wall radius between the inner heat insulation screen and the outer heat insulation screen.

6. The integral heat insulation screen for an aviation braking wheel according to claim 5, characterized in that, The reinforcing plate is an arc-shaped plate, and the cross-section is a U-shaped formed by symmetrically bending a thin plate. The thickness of the thin plate is the same as that of the thin plate of the inner heat insulation screen. The opening width of the U-shaped is equal to 2 times the thickness of the thin plate of the inner heat insulation screen.

7. The integral heat insulation screen for an aviation brake wheel according to claim 6, wherein The integral heat insulation screen is installed in the wheel abdominal cavity and fixed using beam-type guide rails. Except for the square hole part, the beam-type guide rails do not contact the integral heat insulation screen.

8. The integral heat insulation screen for an aviation brake wheel according to claim 7, wherein, The small end of the beam-type guide rail is inserted into the hole at the bottom of the wheel hub, and the large end connects the beam-type guide rail and the wheel hub through bolts. The integral heat insulation screen is clamped between the beam-type guide rail and the wheel hub.

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