A large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control

Abstract

The present invention discloses a large-diameter thin-walled carbon fiber bearing tube structure with precise temperature control, which belongs to the technical field of thermal control of space optical loads. The present invention integrates the design and processing of a low thermal conductivity carbon fiber bearing tube and a high thermal conductivity graphite film, which can improve the overall thermal conductivity of the carbon fiber bearing tube and increase the temperature uniformity of the temperature control of the bearing tube; a first multi-layer thermal insulation component is coated on the outer wall of the bearing tube to effectively suppress the influence of external heat flow in the space such as sunlight irradiation; a second multi-layer thermal insulation component is coated on the inner wall of the bearing tube to reduce radiation heat leakage and further reduce thermal control compensation power; a layer of high thermal conductivity graphite film is arranged between the layers of the first multi-layer thermal insulation component to increase the thermal conductivity within the multi-layer surface, improve the temperature uniformity of the multi-layer, and further improve the temperature stability and temperature uniformity of the bearing tube, while not affecting the thermal conductivity of the multi-layer in the thickness direction, that is, not affecting the thermal insulation and heat preservation effect of the multi-layer.

Description

Technical Field

[0001] The invention relates to the technical field of thermal control of space optical loads, and in particular to a large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control. Background Art

[0002] As the resolution requirements of space optical payloads are getting higher and higher, the structure of space cameras is gradually developing towards large-caliber, lightweight, and high-precision temperature control. As an important structure of camera optical elements, the bearing cylinder not only plays a role in shielding stray light, but is also one of the important supporting components of optical elements. Its temperature level, temperature uniformity and stability directly affect the imaging quality. With the development trend of large-caliber and lightweight cameras, the bearing cylinder gradually adopts lightweight carbon fiber thin-walled structure, and the temperature control index is getting higher and higher.

[0003] During the on-orbit operation of the space camera, it will be affected by the alternating heating and cooling of the space environment, and the thermal environment is very harsh. Especially for light-shielding support structures such as large-diameter thin-walled carbon fiber bearing tubes, on the one hand, the outer surface of the bearing tube will be affected by the heat flow outside the space such as sunlight, causing temperature fluctuations; on the other hand, there is radiation heat exchange between the inner surface of the bearing tube and the 4K cold black environment of the universe. Due to the large diameter of the bearing tube and the fact that there are generally multiple light-blocking rings inside, the radiation area is much larger than that of conventional aperture cameras, which in turn increases radiation heat leakage, resulting in excessive temperature difference in the bearing tube and increased thermal control compensation power. The thermal conductivity of most aerospace-grade carbon fiber materials is generally not higher than 30W / (m·K), making it even more difficult to achieve high-stability and high-precision temperature control.

[0004] The material commonly used to isolate thermal radiation in a vacuum environment is a multi-layer thermal insulation component. The basic structure of a multi-layer thermal insulation component is composed of a reflective layer for reflecting radiant heat and a spacer layer for heat insulation and heat conduction. It has outstanding thermal insulation performance, and the equivalent thermal conductivity can be as low as 10 in theory. -5 W / (m·K), also known as super insulation material. The multilayer material is light, non-volatile, dust-free, easy to install, and suitable for installation on surfaces of various shapes and structures. The outer surface of the space camera is generally covered with multilayer insulation components for heat insulation, but due to the extremely harsh thermal environment of the universe, coating with multiple layers cannot completely achieve precise control of the camera temperature. And because the thermal conductivity of the multilayer material in the plane and thickness direction is extremely low, there is a temperature difference of hundreds of degrees Celsius between the side exposed to sunlight and the side facing the cold and dark environment of the universe, which will cause the temperature of the camera to fluctuate and a certain temperature difference.

[0005] In the prior art, auxiliary temperature control plates are arranged on both sides of the camera lens barrel, i.e., the load-bearing barrel, and heaters are attached to the auxiliary temperature control plates and covered with multi-layer heat insulation components to achieve temperature control. The auxiliary temperature control plates are generally made of metal materials such as aluminum alloy, which occupy a large space, volume and weight, and are not suitable for the development trend of large-caliber and lightweight cameras. They also greatly increase the thermal control resources and reduce the reliability of thermal control. Summary of the invention

[0006] The present invention provides a large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control, which effectively solves the technical problems that the temperature difference of the existing bearing cylinder is too large, the thermal control compensation power is increased, and the thermal insulation of the multi-layer insulation component coated on the outer surface of the bearing cylinder cannot completely achieve precise control of the camera temperature. At the same time, it provides a large-diameter, thin-walled carbon fiber bearing cylinder structure with temperature stability and uniformity and precise temperature control.

[0007] The first object of the present invention is to provide a large-caliber thin-wall carbon fiber bearing cylinder structure with precise temperature control, comprising a bearing cylinder, and further comprising:

[0008] The first graphite film is embedded in the wall of the load-bearing cylinder. The outer wall of the load-bearing cylinder is provided with a plurality of first film heaters and a plurality of first temperature sensors. The first film heaters and the first temperature sensors form a plurality of heating circuits.

[0009] A temperature controller is electrically connected to the first film heater and the first temperature sensor. The first film heater and the first temperature sensor are controlled by the temperature controller to achieve real-time feedback and closed-loop control of the bearing cylinder temperature.

[0010] The first multi-layer heat insulation component is coated on the outer wall of the bearing cylinder, and the first film heater and the first temperature sensor are located between the bearing cylinder and the first multi-layer heat insulation component.

[0011] As a preferred embodiment, the outer wall of the load-bearing cylinder is further provided with a second graphite film, and the second graphite film is located between the load-bearing cylinder and the first film heater and the first temperature sensor. The material of the load-bearing cylinder is carbon fiber with a thermal conductivity of ≤30W / (m·K), and the thermal conductivity of the graphite film is ≥1000W / (m·K).

[0012] As a preferred embodiment, a second multi-layer heat insulation assembly is provided on the inner wall of the load-bearing cylinder.

[0013] As a preferred embodiment, a third graphite film is provided below the outermost reflective layer of the first multi-layer thermal insulation assembly, away from the outer wall of the load-bearing cylinder, and the third graphite film is provided with small holes.

[0014] As a preferred embodiment, the outer wall of the load-bearing cylinder is provided with a plurality of reinforcing ribs, and the reinforcing ribs are located between the load-bearing cylinder and the first multi-layer thermal insulation assembly. The surface of the reinforcing ribs is also provided with a plurality of second film heaters and a plurality of second temperature sensors, and the second film heaters and the second temperature sensors form a plurality of heating circuits, and the second film heaters and the second temperature sensors are electrically connected to the temperature controller.

[0015] As a preferred embodiment, a light-blocking ring is provided on the inner wall of the load-bearing cylinder, and the light-blocking ring is located on the outer wall of the second multi-layer thermal insulation assembly.

[0016] As a preferred embodiment, both side surfaces of the light-blocking ring are covered with a third multi-layer heat-insulating assembly.

[0017] As a preferred embodiment, the first multi-layer thermal insulation assembly, the second multi-layer thermal insulation assembly and the third multi-layer thermal insulation assembly are all composed of a plurality of reflective layers and spacer layers, the reflective layers are polyester film, polyimide film, aluminum plating or metal foil, and the spacer layers are polyester mesh or nylon mesh.

[0018] As a preferred embodiment, away from the outer wall of the load-bearing tube, the infrared emissivity of the outermost reflective layer of the first multi-layer insulation component is ≥0.6, and the solar absorptivity is ≤0.3; away from the inner wall of the load-bearing tube, the infrared emissivity of the outermost reflective layer of the second multi-layer insulation component and the third multi-layer insulation component is ≥0.85, and the solar absorptivity is ≤0.2; the infrared emissivity of the reflective layer inside the first multi-layer insulation component, the second multi-layer insulation component and the third multi-layer insulation component is ≤0.3.

[0019] As a preferred embodiment, the number of layers of the first multi-layer thermal insulation assembly, the second multi-layer thermal insulation assembly and the third multi-layer thermal insulation assembly are all ≤30.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention provides a large-caliber thin-walled carbon fiber bearing cylinder structure with precise temperature control, wherein a first graphite film is embedded in the cylinder wall of the bearing cylinder, a first graphite film is laid in the middle of the cylinder body during the manufacturing and processing of the bearing cylinder, and a plurality of first film heaters and a plurality of first temperature sensors are evenly arranged on the outer wall surface of the bearing cylinder, and the first film heaters and the first temperature sensors form a plurality of heating circuits, and the temperature of the bearing cylinder is connected and controlled by a temperature controller to realize real-time feedback and closed-loop control of the bearing cylinder temperature. The outer wall of the bearing cylinder is provided with a first multi-layer heat insulation component, which effectively suppresses the influence of heat flow outside the space such as sunlight irradiation, and the first film heater and the first temperature sensor are located between the bearing cylinder and the first multi-layer heat insulation component, thereby suppressing the influence of sunlight and the thermal environment of the space. The present invention integrates low thermal conductivity carbon fiber, whose thermal conductivity is ≤30W / (m·K) of the bearing cylinder and high thermal conductivity graphite film, whose thermal conductivity is ≥1000W / (m·K), and integrates integrated design and processing, which can improve the overall thermal conductivity of the carbon fiber bearing cylinder and increase the temperature uniformity of the temperature control of the bearing cylinder.

[0022] In addition, based on the above structure, a second graphite film is further provided on the outer wall of the bearing cylinder, and the second graphite film is located between the bearing cylinder and the first film heater and the first temperature sensor, so as to further adjust the temperature of the outer wall of the bearing cylinder, and cover the inner wall of the bearing cylinder with a second multi-layer thermal insulation component, so as to reduce radiation heat leakage and further reduce the thermal control compensation power; a layer of a third graphite film with high thermal conductivity is arranged between the layers of the first multi-layer thermal insulation component to increase the thermal conductivity within the multi-layer surface, improve the temperature uniformity of the multi-layer, and further improve the temperature stability and temperature uniformity of the bearing cylinder, while not affecting the thermal conductivity of the multi-layer in the thickness direction, that is, not affecting the thermal insulation effect of the multi-layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic structural diagram of the large-diameter, thin-walled carbon fiber bearing cylinder structure for precise temperature control of the present invention.

[0024] Figure 2 This is a schematic diagram of the interior of the large-diameter, thin-walled carbon fiber load-bearing cylinder structure with precise temperature control of the present invention.

[0025] Figure 3 It is a cross-sectional view along the diameter direction of the large-diameter thin-walled carbon fiber bearing cylinder structure with precise temperature control of the present invention.

[0026] Figure 4 for Figure 3 Cross-section along the AA direction.

[0027] Figure 5 It is a temperature curve diagram of the load-bearing cylinder structure of the comparative example of the present invention.

[0028] Figure 6 It is the temperature cloud diagram of the load-bearing cylinder structure of the comparative example of the present invention.

[0029] Figure 7 This is a temperature curve diagram of a large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to an embodiment of the present invention.

[0030] Figure 8 This is a temperature cloud diagram of a large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to an embodiment of the present invention.

[0031] Description of reference numerals:

[0032] 1. Load-bearing cylinder, 1-1. Reinforcing ribs, 1-2. Light-blocking ring, 2. Second graphite film, 3. First multi-layer thermal insulation assembly, 3-1. Second multi-layer thermal insulation assembly, 4. First film heater, 5. Temperature controller, 6. First temperature sensor. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present invention and implement it, the present invention is further described below in conjunction with specific embodiments and drawings, but the embodiments are not intended to limit the present invention. The following test methods and detection methods, unless otherwise specified, are conventional methods; the reagents and raw materials, unless otherwise specified, are commercially available.

[0034] The technical solution of the large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control provided by the present invention is described in detail below.

[0035] The present invention provides a large-caliber thin-wall carbon fiber bearing cylinder structure with precise temperature control, comprising a bearing cylinder 1, and further comprising:

[0036] The first graphite film is embedded in the wall of the load-bearing cylinder 1. The outer wall of the load-bearing cylinder 1 is provided with a plurality of first film heaters 4 and a plurality of first temperature sensors 6. The first film heaters 4 and the first temperature sensors 6 form a plurality of heating circuits.

[0037] The temperature controller 5 is electrically connected to the first film heater 4 and the first temperature sensor 6. The first film heater 4 and the first temperature sensor 6 are controlled by the temperature controller 5 to achieve real-time feedback and closed-loop control of the temperature of the bearing cylinder 1.

[0038] The first multi-layer heat-insulating assembly 3 is coated on the outer wall of the bearing cylinder 1 , and the first film heater 4 and the first temperature sensor 6 are located between the bearing cylinder 1 and the first multi-layer heat-insulating assembly 3 .

[0039] In the above technical scheme, the low thermal conductivity carbon fiber bearing cylinder and the high thermal conductivity graphite film are integrated into an integrated design and processing, which can improve the overall thermal conductivity of the carbon fiber bearing cylinder and increase the temperature uniformity of the temperature control of the bearing cylinder; the present invention can efficiently control the temperature levels of the inner and outer walls of the large-diameter bearing cylinder, and achieves better technical effects on the stability and uniformity of temperature control.

[0040] For the design of the above-mentioned load-bearing tube structure, the radiation insulation design ideas are as follows:

[0041] 1. The load-bearing cylinder of the space camera has a high temperature control accuracy requirement, generally at 20±2℃. Therefore, in addition to passive thermal control measures, active precision temperature control measures are also required for the load-bearing cylinder 1.

[0042] The specific measures are as follows: the surface of the bearing cylinder 1 is divided into multiple areas, and each area is evenly pasted with a number of first film heaters 4 to form a corresponding heating circuit. Each heating circuit is provided with a first temperature sensor 6 to collect the temperature of the area. Finally, the temperature controller 5 controls the first film heater 4 and the first temperature sensor 6 to achieve real-time feedback and regulation of the temperature of the bearing cylinder 1. The temperature control strategy of the temperature controller 5 is generally switch, switch + proportion, and PID mode. The heating power of each heating circuit is preliminarily calculated according to the following formula, and finally adjusted and determined through simulation analysis.

[0043] - ;

[0044] Where: Q—compensation power of the heating circuit, W; ε1—equivalent infrared emissivity of multiple layers on the inner surface of the load-bearing cylinder; ε2—equivalent infrared emissivity of multiple layers on the outer surface of the load-bearing cylinder; A1—surface area of ​​multiple layers on the inner surface of the load-bearing cylinder, m 2 ; A2—Surface area of ​​multiple layers on the outer surface of the load-bearing cylinder, m 2 ; T2—surface temperature of the load-bearing cylinder, °C; T1—background ambient temperature of the space, 4K; q1—heat flux from the space absorbed by the multiple layers on the inner surface of the load-bearing cylinder, W / m 2 ; q2—heat flux outside the space absorbed by multiple layers on the outer surface of the load-bearing cylinder, W / m 2 ; σ— Stefan-Boltzmann constant, σ=5.67×10 -8 W / (m 2 ·K4).

[0045] 2. In order to suppress the influence of direct sunlight, earth reflection, earth infrared heat flux and 4K space background from space, the outer wall of the load-bearing cylinder 1 is covered with a first multi-layer insulation component 3 for heat insulation.

[0046] The multilayer thermal insulation material used in the first multilayer thermal insulation component 3 has outstanding thermal insulation performance in a vacuum environment, and the equivalent thermal conductivity can be as low as 10 in theory. -5 W / m·K, also known as super insulation material. The multi-layer material is light, non-volatile, dust-free, easy to install, and suitable for installation on various shapes and surfaces.

[0047] The basic structure of multi-layer thermal insulation materials consists of a reflective layer that reflects radiant heat and a spacer layer for heat insulation and heat conduction. The reflective layer is generally an organic film, such as polyester film, polyimide film, single-sided or double-sided aluminum plating or metal foil, and the spacer layer is generally polyester mesh, nylon mesh or other low thermal conductivity materials.

[0048] The basic principle of multilayer insulation material is: on two infinitely large parallel planes, denoted as surface 1 and surface 2, if both surfaces have the properties of gray surfaces and the middle is in a vacuum state, the radiation heat transfer between the two surfaces is:

[0049] ;

[0050] Where: Stefan-Boltzmann constant; A—radiation heat transfer area; T3—temperature of surface 1; T4—temperature of surface 2; — emissivity of surface 1; —Emissivity of surface 2.

[0051] If there are n intermediate reflection layers between surface 1 and surface 2, the heat transfer is:

[0052] ;

[0053] The thermal insulation effect of multiple layers is related to the emissivity of each surface and the number of intermediate reflective layers. The lower the emissivity of each layer, the more layers there are, and the better the thermal insulation effect. However, due to the influence of heat conduction and heat leakage between layers of multi-layer thermal insulation materials, the number of layers of multi-layer thermal insulation components is generally not more than 30.

[0054] In order to effectively avoid the problem of uneven temperature distribution, the outer wall of the bearing cylinder 1 is further provided with a second graphite film 2. The bearing cylinder is made of carbon fiber with a thermal conductivity of ≤30W / (m·K), and the thermal conductivity of the second graphite film is ≥1000W / (m·K).

[0055] It should be emphasized that, due to the complex and changeable satellite attitude maneuvers during the period of being in orbit, the thermal environment of the bearing cylinder is also very harsh and changeable, which can easily cause the problem of uneven temperature distribution. Moreover, the bearing cylinder is made of carbon fiber material with low thermal conductivity, with a thermal conductivity of ≤30W / (m·K), and the uneven temperature distribution will be more obvious. Therefore, a layer of high thermal conductivity second graphite film 2 is attached to the outer surface of the bearing cylinder 1, and its thermal conductivity is ≥1000W / (m·K) to improve the overall thermal conductivity of the bearing cylinder 1 and reduce its temperature gradient.

[0056] The second graphite film 2 can be pasted on the surface of the bearing cylinder by pasting or high-temperature pressing. After the combination, the overall thermal resistance is the parallel value of the thermal resistance of the two, that is, the overall thermal resistance decreases and the overall thermal conductivity increases. The calculation formula is as follows:

[0057] ;

[0058] ;

[0059] ;

[0060] Where: λ1—thermal conductivity of carbon fiber, W / (m·K); λ2—thermal conductivity of graphite film, W / (m·K); A3—surface area of ​​carbon fiber, m 2 ; A4—graphite film surface area, m 2; L1—carbon fiber thickness, m; L2—graphite film thickness, m; R 石墨膜 —Graphite film thermal resistance, K / W; R 碳纤维 —Thermal resistance of carbon fiber, K / W.

[0061] In order to further ensure that the bearing cylinder 1 is kept at a normal temperature, a second multi-layer heat insulation component 3-1 is provided on the inner wall of the bearing cylinder 1. Since the bearing cylinder 1 has a large diameter and the inner surface is blackened, the surface infrared emissivity ε≥0.8, and the heat exchange with the cold black space radiation is very large. In order to ensure that the bearing cylinder 1 is kept at a normal temperature while in orbit, a large amount of heating power needs to be compensated, which will greatly increase resources and research and development costs. Therefore, the second multi-layer heat insulation component 3-1 is coated on the inner wall of the bearing cylinder 1 for heat insulation to save power.

[0062] In order to ensure the uniformity and stability of the temperature of the main body of the bearing cylinder 1, a third graphite film is further arranged under the reflective layer of the first multi-layer heat insulation component 3 away from the outer wall of the bearing cylinder 1, and the third graphite film is provided with small holes.

[0063] When the satellite is in orbit, its attitude changes, and the first multi-layer insulation component 3 on the surface of the camera support tube 1 will be exposed to the sun on one side and in the shadow area on the other side. Since the thermal conductivity of the reflective layer of the first multi-layer insulation component 3 is very low (thermal conductivity ≤ 1W / (m·K)), the temperature of the outermost reflective layer on the side exposed to the sun will rise to hundreds of degrees Celsius, and the temperature of the reflective layer in the shadow area on the other side will be around minus 100 degrees Celsius. Although the first multi-layer insulation component 3 can isolate most of the heat, there will still be a small amount of heat that affects the temperature of the support tube 1 through radiation and heat conduction, causing the temperature on one side of the support tube 1 to be too high or the temperature to be too high locally.

[0064] To this end, a layer of high thermal conductivity third graphite film is arranged under the last reflective layer from the inside to the outside of the first multi-layer insulation assembly in the direction away from the outer wall of the bearing cylinder 1, so as to increase the thermal conductivity in the direction of the multi-layer surface, reduce the overall temperature gradient of the multi-layer, and further improve the temperature uniformity and stability of the bearing cylinder 1 body.

[0065] In order to further achieve uniformity of the outer wall temperature of the load-bearing cylinder 1 and increase the strength and rigidity of the load-bearing cylinder 1, the outer wall of the load-bearing cylinder 1 is provided with a plurality of reinforcing ribs 1-1, and a plurality of second film heaters and a plurality of second temperature sensors are provided on the surface of the reinforcing ribs 1-1. The second film heaters and the second temperature sensors form a plurality of heating circuits.

[0066] In order to prevent stray light from entering the interior of the camera and interfering with imaging, a light blocking ring 1-2 is provided on the inner wall of the support cylinder 1, and the light blocking ring 1-2 is located on the outer wall of the second multi-layer thermal insulation component 3-1.

[0067] In order to further balance the temperature of the bearing cylinder 1, the surfaces on both sides of the light-blocking ring 1-2 are covered with a third multi-layer heat insulation component.

[0068] In order to ensure the temperature control and insulation effect of the load-bearing cylinder 1, the first multi-layer insulation component 3, the second multi-layer insulation component 3-1 and the third multi-layer insulation component are all composed of a reflective layer and a spacer layer. The reflective layer is a polyester film, a polyimide film, an aluminum plated layer or a metal foil, and the spacer layer is a polyester mesh or a nylon mesh.

[0069] It should be noted that in order to further adjust the temperature of the load-bearing cylinder 1 and keep it in a balanced state, away from the outer wall of the load-bearing cylinder 1, the infrared emissivity of the outermost reflective layer of the first multi-layer insulation component 3 is ≥0.6, and the solar absorptivity is ≤0.3; away from the inner wall of the load-bearing cylinder 1, the infrared emissivity of the outermost reflective layer of the second multi-layer insulation component 3-1 and the third multi-layer insulation component is ≥0.85, and the solar absorptivity is ≤0.2; the infrared emissivity of the reflective layer inside the first multi-layer insulation component 3 and the second multi-layer insulation component 3-1 is ≤0.3.

[0070] In order to prevent heat leakage between layers of multi-layer thermal insulation materials, the number of layers of the first multi-layer thermal insulation component 3 and the second multi-layer thermal insulation component 3-1 are both ≤30.

[0071] The technical effects of this case are described below through specific embodiments.

[0072] Example

[0073] A large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control, specifically comprising: a bearing cylinder 1 made of carbon fiber with a thermal conductivity of ≤30W / (m·K), a first graphite film with a thermal conductivity of ≥1000W / (m·K) embedded in the cylinder wall of the bearing cylinder 1 through an integrated molding process, a second graphite film 2 is adhered to the outer wall of the bearing cylinder 1 to improve the overall thermal conductivity of the bearing cylinder 1, a plurality of first film heaters 4 and a plurality of first temperature sensors 6 are evenly adhered to the outer wall of the bearing cylinder 1, the first film heater 4 and the first temperature sensor 6 form a plurality of heating circuits; the first film heater 4 and the first temperature sensor 6 are electrically connected to a temperature controller 5, the first film heater 4 and the first temperature sensor 6 are controlled by the temperature controller 5, and real-time feedback and closed-loop control of the temperature of the bearing cylinder 1 are realized.

[0074] The outer wall of the load-bearing cylinder 1 is provided with a plurality of reinforcing ribs 1 - 1 , and the surface of the reinforcing ribs 1 - 1 is also provided with a plurality of second film heaters and a plurality of second temperature sensors, and the second film heaters and the second temperature sensors form a plurality of heating circuits.

[0075] The outer wall of the bearing cylinder 1 is covered with a first multi-layer heat insulation component 3, and the first film heater 4 and the first temperature sensor 6 are located between the bearing cylinder 1 and the first multi-layer heat insulation component 3. A third graphite film is also arranged below the reflective layer of the first multi-layer heat insulation component 3 away from the outer wall of the bearing cylinder 1, and the third graphite film is provided with small holes.

[0076] The inner wall of the support cylinder 1 is provided with a light-blocking ring 1-2, the inner wall of the support cylinder 1 is provided with a second multi-layer heat-insulating component 3-1, and both side surfaces of the light-blocking ring 1-2 are covered with the second multi-layer heat-insulating component 3-1.

[0077] In this embodiment, away from the outer wall of the load-bearing tube 1, the outermost reflective layer of the first multi-layer insulation component 3 is made of single-sided silver-plated F46 film, whose infrared emissivity is 0.73 and solar absorptivity is 0.13; away from the inner wall of the load-bearing tube 1, the outermost reflective layers of the second multi-layer insulation component 3-1 and the third multi-layer insulation component are made of black coated polyester silk, whose infrared emissivity is 0.9 and solar absorptivity is 0.1; the reflective layers inside the first multi-layer insulation component 3, the second multi-layer insulation component 3-1 and the third multi-layer insulation component are double-sided aluminum-plated polyester films.

[0078] In this embodiment, the number of layers of the first multi-layer thermal insulation assembly 3, the second multi-layer thermal insulation assembly 3-1 and the third multi-layer thermal insulation assembly are all 20 layers.

[0079] In order to further illustrate the technical effect of the present invention, the present invention also sets a comparative example, which is as follows:

[0080] Comparative Example

[0081] Compared with the embodiment, the difference is that no graphite film is provided on the outer wall of the load-bearing cylinder 1 and in the first multi-layer thermal insulation assembly 3 .

[0082] A large-diameter thin-walled carbon fiber bearing cylinder structure, specifically: comprising a bearing cylinder 1 made of carbon fiber with a thermal conductivity of ≤30W / (m·K), a plurality of first film heaters 4 and a plurality of first temperature sensors 6 evenly attached to the outer wall surface of the bearing cylinder 1, the first film heaters 4 and the first temperature sensors 6 forming a plurality of heating circuits; the first film heaters 4 and the first temperature sensors 6 are electrically connected and provided with a temperature controller 5, the first film heaters 4 and the first temperature sensors 6 are controlled by the temperature controller 5, so as to realize real-time feedback and closed-loop control of the temperature of the bearing cylinder 1.

[0083] The outer wall of the load-bearing cylinder 1 is provided with a plurality of reinforcing ribs 1 - 1 , and the surface of the reinforcing ribs 1 - 1 is also provided with a plurality of second film heaters and a plurality of second temperature sensors, and the second film heaters and the second temperature sensors form a plurality of heating circuits.

[0084] The outer wall of the support cylinder 1 is covered with a first multi-layer heat insulation component 3 , and the first film heater 4 is located between the support cylinder 1 and the first multi-layer heat insulation component 3 .

[0085] The inner wall of the support cylinder 1 is provided with a light-blocking ring 1-2, the inner wall of the support cylinder 1 is provided with a second multi-layer heat-insulating component 3-1, and the surfaces on both sides of the light-blocking ring 1-2 are covered with a third multi-layer heat-insulating component.

[0086] In this embodiment, the first multi-layer thermal insulation component 3, the second multi-layer thermal insulation component 3-1 and the third multi-layer thermal insulation component are all composed of a reflective layer and a spacer layer, the reflective layer is a polyester film, a polyimide film, aluminized or metal foil, and the spacer layer is a polyester mesh or a nylon mesh.

[0087] In this embodiment, away from the outer wall of the load-bearing tube 1, the infrared emissivity of the reflective layer of the first multi-layer insulation component 3 is ≥0.6 or ≤0.3, and the solar absorptivity is ≤0.3; away from the inner wall of the load-bearing tube 1, the infrared emissivity of the reflective layer of the second multi-layer insulation component 3-1 and the third multi-layer insulation component is ≥0.85, and the solar absorptivity is ≤0.2.

[0088] As a preferred embodiment, the number of layers of the first multi-layer thermal insulation assembly 3, the second multi-layer thermal insulation assembly 3-1 and the third multi-layer thermal insulation assembly are all ≤30.

[0089] The performance of the large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control prepared in the above embodiment of the present invention was simulated and analyzed, and the results are as follows.

[0090] Simulation Analysis Results

[0091] like Figure 5~Figure 6 This is the result of not setting graphite film on the surface of the load-bearing cylinder and the inside of the multi-layer. It can be seen that without taking temperature equalization measures, the temperature level of the load-bearing cylinder is 18.7℃~28.2℃, and the maximum temperature gradient is 9.5℃, which cannot meet the design index requirements.

[0092] After the graphite film is set on the surface of the bearing cylinder and the multi-layer interior, the temperature level of the bearing cylinder is 19.2℃~21.0℃, and the maximum temperature gradient is 1.8℃, which meets the design requirements. The analysis results are as follows Figure 7~Figure 8 This shows that this method can effectively control the temperature level of large-diameter bearing cylinders and significantly improve the stability and uniformity of temperature control.

[0093] In summary, the large-diameter thin-walled carbon fiber bearing cylinder structure with precise temperature control provided by the present invention can efficiently control the temperature levels of the inner and outer walls of the large-diameter bearing cylinder, and achieves better technical effects on the stability and uniformity of temperature control.

[0094] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control, comprising a bearing cylinder (1), characterized in that: Also includes: A first graphite film is embedded in the wall of the support cylinder (1); a plurality of first film heaters (4) and a plurality of first temperature sensors (6) are arranged on the outer wall of the support cylinder (1); the first film heaters (4) and the first temperature sensors (6) form a plurality of heating circuits; a second graphite film (2) is also arranged on the outer wall of the support cylinder (1); the second graphite film (2) is located between the support cylinder (1) and the first film heaters (4) and the first temperature sensors (6); the material of the support cylinder is carbon fiber with a thermal conductivity of ≤30 W / (m·K); A temperature controller (5) electrically connected to the first film heater (4) and the first temperature sensor (6), and controlling the first film heater (4) and the first temperature sensor (6) through the temperature controller (5) to achieve real-time feedback and closed-loop control of the temperature of the bearing cylinder (1); A first multi-layer heat insulation component (3) is coated on the outer wall of the bearing cylinder (1); the first film heater (4) and the first temperature sensor (6) are located between the bearing cylinder (1) and the first multi-layer heat insulation component (3), away from the outer wall of the bearing cylinder (1); a third graphite film is also provided under the outermost reflective layer of the first multi-layer heat insulation component (3); the third graphite film is provided with small holes; The thermal conductivities of the first graphite film, the second graphite film and the third graphite film are all ≥1000 W / (m·K).

2. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 1 is characterized in that: The inner wall of the load-bearing cylinder (1) is provided with a second multi-layer heat insulation component (3-1).

3. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 1 is characterized in that: The outer wall of the load-bearing cylinder (1) is provided with a plurality of reinforcing ribs (1-1), the reinforcing ribs (1-1) are located between the load-bearing cylinder (1) and the first multi-layer thermal insulation assembly (3), the surface of the reinforcing ribs (1-1) is provided with a plurality of second film heaters and a plurality of second temperature sensors, the second film heaters and the second temperature sensors form a plurality of heating circuits, and the second film heaters and the second temperature sensors are electrically connected to a temperature controller (5).

4. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 2 is characterized in that: The inner wall of the load-bearing cylinder (1) is provided with a light-blocking ring (1-2), and the light-blocking ring (1-2) is located on the outer wall of the second multi-layer heat insulation component (3-1).

5. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 4 is characterized in that: The surfaces on both sides of the light-blocking ring (1-2) are coated with a third multi-layer heat insulation component.

6. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 5 is characterized in that: The first multi-layer thermal insulation component (3), the second multi-layer thermal insulation component (3-1) and the third multi-layer thermal insulation component are all composed of a plurality of reflective layers and spacer layers, wherein the reflective layers are polyester films, polyimide films, aluminum plating or metal foils, and the spacer layers are polyester mesh or nylon mesh.

7. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 6 is characterized in that: Away from the outer wall of the load-bearing tube (1), the infrared emissivity of the outermost reflective layer of the first multi-layer heat insulation component (3) is ≥0.6, and the solar absorptivity is ≤0.3; away from the inner wall of the load-bearing tube (1), the infrared emissivity of the outermost reflective layer of the second multi-layer heat insulation component (3-1) and the third multi-layer heat insulation component is ≥0.85, and the solar absorptivity is ≤0.2; the infrared emissivity of the reflective layer inside the first multi-layer heat insulation component (3), the second multi-layer heat insulation component (3-1) and the third multi-layer heat insulation component is ≤0.

3.

8. The large-diameter, thin-walled carbon fiber bearing cylinder structure with precise temperature control according to claim 6 is characterized in that: The number of layers of the first multi-layer thermal insulation component (3), the second multi-layer thermal insulation component (3-1) and the third multi-layer thermal insulation component are all ≤30.

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