• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to a spacecraft (1) comprising: - a housing (2) delimiting an interior space and an outer space, the housing having a first face and a second face opposite the first face, - a first radiator (16) and a second radiator (18) carried by the first face and the second face respectively, the first radiator (16) and the second radiator (18) each having an internal main face, an external main face opposite to the internal main face and side faces (19). The spacecraft (1) further comprises a first auxiliary radiator (32) and a first auxiliary heat transfer device (34) thermally connecting said first auxiliary radiator (32) to the inner main face of the second radiator (36), the first auxiliary radiator (18) being arranged in a first portion of the outer space (13), said first portion being delimited by the outer main face of the first radiator and by first planes (48, 50, 52, 54) containing the side faces (19) of the first radiator.
    公开号:FR3030458A1
    申请号:FR1462687
    申请日:2014-12-18
    公开日:2016-06-24
    发明作者:Fabrice Mena
    申请人:Airbus Defence and Space SAS；
    IPC主号:
    专利说明:

    [0001] The present invention relates to a spacecraft and in particular to a geostationary satellite.
    [0002] Due to the earth's revolution around the sun, the different faces of a geostationary satellite do not receive the same amount of solar radiation during the seasons. This results in significant differences in temperatures between the + Y and - Y sides of the satellite as well as cyclical variations in these temperatures during the seasons. Thus, as shown in Figure 1, during the winter solstice (WS), the face + Y, exposed to solar radiation, has higher temperatures than the face - Y in the shade. During the summer solstice (SS), it is the face - Y which has high temperatures because it is she who is exposed to solar radiation while the face + Y is in the shade. During the winter and summer equinoxes (EQ), the Y-faces and Y-faces exhibit lower temperatures than during the winter (WS) and summer (SS) solstices. These temperature differences between the + Y face and the Y face as well as temperature fluctuations during the seasons, are binding for the satellite and its payload. To reduce these temperature differences, various palliative systems have already been put in place. However, these palliative systems are not completely satisfactory. Heat pipes have for example been arranged between the radiator fixed on the face + Y and the radiator fixed on the face - Y. These heat pipes are used to transfer heat from a radiator located on the side of the sun to a radiator located at the shadow. However, despite the presence of these heat pipes, temperature differences between the face + Y and the face -Y remain important especially during the summer and winter solstices during which they can reach about 10 ° C to 15 ° vs. Electric heaters were also used to warm the satellite faces on the shadow side. Nevertheless, the heaters are limited in efficiency and require over-sizeing the satellite's electrical power system. This oversizing significantly increases the cost of the electric power system. In addition, the heating of the cold parts of the satellite also causes an increase in the temperature of the hot parts thereof. However, these hot parts are already close to their operating limit temperature. Moreover, these temperature differences between the faces of the satellite must be reproduced during satellite qualification tests. The implementation of these thermal differences and their quarterly fluctuation in a vacuum atmosphere is complex.
    [0003] The aim of the present invention is to limit the temperature differences between the + Y and -Y faces and to reduce, for the same face, temperature variations during the seasons.
    [0004] For this purpose, the subject of the invention is a spacecraft comprising: a housing delimiting an interior space and an outside space, the case having a first face and a second face opposite to the first face, a first radiator and a second radiator carried by the first face and respectively the second face, the first radiator and the second radiator each having an inner main face, an outer main face opposite to the inner main face and side faces, characterized in that the spacecraft comprises in addition a first auxiliary radiator and a first auxiliary heat transfer device thermally connecting said first auxiliary radiator to the internal main face of the second radiator, the first auxiliary radiator being arranged in a first portion of the external space, said first portion being defined by the external main face of the first radiator and by first planes con holding the side faces of the first radiator. Advantageously, the first set of heat transfer device and first auxiliary radiator can cool the second radiator when it is exposed to solar radiation, that is to say during the winter solstice and summer solstice. The cooling of the second radiator allows more efficient cooling of the electronic equipment.
    [0005] Advantageously, the decrease in the temperature variations of the faces of the spacecraft should make it possible to reduce the duration of the thermal vacuum qualification tests. This would result in a significant gain in terms of the cost and design time of a spacecraft.
    [0006] Advantageously, the first auxiliary heat transfer device and first auxiliary radiator can be easily mounted and disassembled on a spacecraft during the design or be added to an existing spacecraft. The addition of this set does not require modifying the architecture of the existing spacecraft.
    [0007] Advantageously, the first set of heat transfer device and first auxiliary radiator has a small footprint. This set makes it possible to increase the thermal rejection capacity of the spacecraft without increasing the size of the first and second radiators. Advantageously, the first heat transfer device assembly and first auxiliary radiator has a low mass and cost. According to particular embodiments, the spacecraft comprises one or more of the following characteristics: said first auxiliary radiator is thermally insulated from the first radiator; the spacecraft comprises a second auxiliary radiator and a second auxiliary heat transfer device thermally connecting said second auxiliary radiator to the internal main face of the first radiator; said second auxiliary radiator being arranged in a second outer space portion delimited by the outer main face of the second radiator and by second planes containing the lateral faces of the second radiator, and wherein the first auxiliary heat transfer device and the second device auxiliary heat transfer are reversible. Advantageously, the use of a second auxiliary radiator and two reversible heat transfer devices also makes it possible to heat the first face of the spacecraft, when the second face is exposed to solar radiation. Thus, the first face is subject to less significant temperature variations between the winter solstice and the summer solstice. at least one of the first auxiliary radiator and the second auxiliary radiator is covered with a coating with high solar absorptivity and high infra-red emissivity, for example black paint. at least one of the first auxiliary radiator and the second auxiliary radiator comprises at least one main radiative face which extends in a direction perpendicular to the external principal face of the first radiator. Such an arrangement makes it possible to increase the overall radiative surface of the spacecraft. This arrangement only minimizes the radiative surface and the efficiency of the first and second radiators. the first auxiliary radiator comprises at least two plates which intersect each other. This embodiment makes it possible to reduce the radiative surface of the second radiator concealed by the first auxiliary radiator. This embodiment allows to always offer the same surface exposed to the sun when the sun rotates around the auxiliary radiator during a day. the first auxiliary radiator has the general shape of a section of cylindrical open at each of its ends. the first auxiliary radiator (has the general shape of a parallelepiped open at each of its ends) When the first and second auxiliary heat transfer devices are reversible, the arrangements described above make it possible to have throughout the day at least a part of the auxiliary radiator exposed to the sun Thus, the variations of solar radiation related to the orbital movement are compensated over a period of twenty-four hours - the first thermal transfer device is non-reversible - the first auxiliary radiator is made of a flexible material - the first auxiliary radiator is made of graphoil.
    [0008] The invention will be better understood on reading the description which follows, given solely by way of example and with reference to the drawings, in which: FIG. 1 are two curves representative of the temperature variations of the faces + Y and -Y of a spacecraft according to the state of the art during a year; - Figure 2 is a schematic view of the spacecraft according to the invention in geostationary orbit; FIG. 3 is a schematic perspective view of a first embodiment of the spacecraft according to the invention, during the equinox; FIG. 4 is a schematic perspective view of the spacecraft illustrated in FIG. 3, at the time of the winter solstice; FIG. 5 is a schematic perspective view of the spacecraft illustrated in FIG. 3, at the time of the summer solstice; FIG. 6 is two curves representative of the temperature variations of the spacecraft + Y and -Y faces illustrated in FIG. 3, during a year; FIG. 7 is a simplified front view of the spacecraft illustrated in FIGS. 3 to 5; FIG. 8 is a schematic perspective view of an auxiliary radiator according to the invention; FIG. 9 is a diagrammatic front view of the auxiliary radiator illustrated in FIG. 8; FIG. 10 is a schematic perspective view of a second embodiment of the spacecraft according to the invention, during the winter solstice; FIG. 11 is a schematic perspective view of the spacecraft illustrated in FIG. 10, during the summer solstice; and FIG. 12 is two curves representative of the temperature variations of the spacecraft + Y and -Y faces illustrated in FIG. 11 during a year. In the different figures, the same references designate identical or similar elements.
    [0009] With reference to FIG. 2, a spacecraft 1 of the geostationary satellite type is able to turn on an orbit 3 around the Earth 4, the Earth 4 itself rotating on an orbit 27 around the Sun 29. The spacecraft 1 is in the form of a parallelepipedal housing 2 delimiting an interior space 11 and an outer space 13. This housing 2 always has the same face directed towards the Earth, this face being called the Earth face 5. The opposite face and parallel to the face of the earth 5 is itself called the anti-Earth face 6. The face-X, also called the east face 9, and the face + X, also called the west face 10, are opposite sides, parallel to each other and perpendicular to the direction of movement of the spacecraft 1. Communication antennas 12 are generally fixed on the faces -X 9 and + X 10. The face - Y, also called North face 7, and the face + Y, also called face South 8, are two other faces of the housing. They are opposite, parallel to each other and perpendicular to the North-South axis of the Earth 4. For reasons of simplification of the description, the faces -Y and + Y will be designated later by the terms first face 7 and respectively second face 8. Solar panels 14 are fixed on the first 7 and second 8 faces. Finally, a first main radiator 16, generally called radiator North, is fixed to and extends on the first face 7. A second main radiator 18, generally called radiator South, is attached to and extends on the second face 8. With reference to FIG. 3, the first 16 and second 18 radiators have a parallelepipedal general shape. They each have four lateral faces 19, 25, an inner main face 15, 21 fixed to the housing 2, an outer main face 17, 23 opposite to the inner main face and located on the outer space side 13. The spacecraft 1 transports electronic equipment 20 as well as a first 22 and a second 24 main thermal transfer devices suitable for cooling the electronic equipment 20. The electronic equipment conventionally comprises radio frequency equipment, electronic equipment, measuring instruments, computing units and batteries. The first main thermal transfer device 22 thermally connects the electronic equipment 20 to the first radiator 16. The second main heat transfer device 24 thermally connects the electronic equipment 20 to the second radiator 18. In a conventional manner, the first 22 and second 24 devices of FIG. The main thermal transfers each comprise an evaporator 26 in thermal contact with electronic equipment 20, a condenser 28 in thermal contact with the first radiator 16 and the second radiator 18 respectively, and pipes 30 for transporting a heat transfer fluid connecting the evaporator 26 to the condenser 28. By convention, the evaporators are schematized in the figures by a set circle and rectangle and the condensers by a rectangle. These main heat transfer devices 22 and 24 may conventionally be Heat Pipes or capillary fluid loops in which the fluid reservoir is integrated into the evaporator (Loop Heat Pipe). "). According to the invention, the spacecraft 1 further comprises a first auxiliary radiator 15 fixed to the first radiator 16, a first auxiliary heat transfer device 34 capable of transferring heat from the first auxiliary radiator 32 to the inner face 21 of the radiator 16. second radiator, a second auxiliary radiator 36 attached to the second radiator 18, and a second auxiliary heat transfer device 38 for transferring heat from the second auxiliary radiator 36 to the inner face of the first radiator. The first 34 and second 38 auxiliary heat transfer devices are identical. They are non-reversible, that is, they are mono-directional. They each comprise an evaporator 40, a condenser 42 and pipes 44 (thermally connecting the evaporator 40 to the condenser 42). Preferably, it will be a capillary pumping loop (in English "Capillary Driven Loop / CDL"). and in particular a capillary fluid loop in which the fluid reservoir is integrated into the evaporator (in English "Loop Heat Pipe"), These devices are well known to those skilled in the art. ECSS-E-ST-31-02C of 12/12/2012. The evaporator 40 of the first auxiliary heat transfer device is in thermal contact with the inner main face 21 of the second radiator 18. The evaporator 40 of the second The auxiliary heat transfer device is in thermal contact with the internal main face of the first radiator and the condenser of the first auxiliary heat transfer device is in thermal contact with the first radiator. 32. The condenser 42 of the second auxiliary heat transfer device is in thermal contact with the second auxiliary radiator 36.
    [0010] The first auxiliary radiator 32 and the first auxiliary heat transfer device 34 cool the second radiator 18 when it is exposed to solar radiation, that is to say during the winter solstice (WS). Indeed, as shown in Figure 4, during the winter solstice, the second radiator 18 is exposed to solar radiation while the first auxiliary radiator 32 is located in the shadow of the satellite housing. The difference in temperature between the second radiator 18 and the first auxiliary radiator 32 generates a transfer of a heat portion 01A of the second radiator 18 to the first auxiliary radiator 32 via the first auxiliary heat transfer device 34. 01A heat is discharged to the outer space 13 by the first auxiliary radiator 32. Accordingly, as shown in Figure 6, the temperature of the second face (face + Y) decreases during the winter solstice, reducing the temperature difference between the first and second faces. In the same way, the second auxiliary radiator 36 and the second auxiliary heat transfer device 38 make it possible to cool the first radiator 16 when it is exposed to solar radiation, that is to say during the summer solstice ( SS). As shown in Figure 5, during the summer solstice, the first radiator 16 is exposed to solar radiation while the second auxiliary radiator 36 is located in the shadow of the satellite housing. The difference in temperature between the first radiator 16 and the second auxiliary radiator 36 causes the transfer of a heat portion 01B from the first radiator 16 to the second radiator 36 through the second auxiliary heat transfer device 38. This part 01B of the heat is evacuated by the second auxiliary radiator 36 which is located on the shadow side during the summer solstice. Thus, as shown in FIG. 6, the temperature of the first face (face-Y) decreases, during the summer solstice, reducing the temperature difference between the first and second faces.
    [0011] In order to allow this heat transfer, the first 32 and second 36 auxiliary radiators are each arranged in the shadow of the first radiator and the second radiator during a solstice. Thus, the first auxiliary radiator 32 is disposed in the extension of the first radiator 16, in a direction perpendicular to the first face 7 of the first radiator 16. It extends in a first portion 46 of the outer space 13 which is located at the shadow during the winter solstice. This first portion 46 is delimited by the outer main face 17 of the first radiator and four planes 48, 50, 52, 54 each containing a side face 19 of the first radiator, as shown schematically in Figures 4 and 7. In the same way the second auxiliary radiator 36 is disposed in the extension of the second radiator 18, in a direction perpendicular to the face Y of the second radiator 18. It extends in a second portion 56 of the outer space 13 which is located at the shadow during the summer solstice. This second portion 56 is delimited by the outer main face 23 of the second radiator and by four planes 58, 60, 62, 64 each containing a lateral face 25 of the second radiator as shown schematically in FIGS. 5 and 7. The first portion 32 and the second 36 auxiliary radiators are, for example, arranged above the solar panels 14 when the latter are folded into the launch configuration. They have a small dimension in the normal direction to the first 7 and second 8 faces because they must be able to be housed in the space under the starter cap. The first 32 and second 36 auxiliary radiators are preferably thermally insulated from the first 16 and second 18 radiators that support them. This thermal insulation is, for example, carried out by placing plastic washers in the fixing feet of the auxiliary radiators 32, 36 to the main radiators 16, 18. Advantageously, this thermal insulation makes it possible to considerably increase the efficiency of the auxiliary radiators 32, 36. Indeed, as shown in Figure 1, the first radiator 16 and the second radiator 18 have, even when in the shade, a temperature of around 60 ° C. Since the auxiliary radiators 32, 36 are isolated from the main radiators 16, 18, they have a much lower temperature than the temperature of the radiator fixed on the opposite face of the housing 2 so that they are able to absorb efficiently large amount of heat from this radiator. Thus, despite their small size, they can effectively remove the heat received. According to an exemplary embodiment shown, the first auxiliary radiator 32 has the general shape of a cross. It is formed of a main rectangular plate 68 and two secondary plates 70, 72 fixed on either side of the main plate 68.
    [0012] Heat pipes 74 extend on the faces of the main plate 68 and on the faces of the secondary plates 70,72. The condenser 42 is fixed on one face of the main plate 68. It is in thermal contact with the heat pipes 74. The heat pipes 74 thus make it possible to distribute uniformly over the entire auxiliary radiator 32, the heat coming from the capacitor 42. is then radiated to the outer space 13. The second auxiliary radiator 36 is identical to the first auxiliary radiator and will not be described a second time. Alternatively, the first auxiliary radiator 32 may have the general shape of a star having any number of branches such as for example three branches, five or six branches. The main and secondary plates 70, 72 are advantageously made of a flexible material, such as, for example, graphoil. In this case, the heat pipes 74 make it possible to stiffen the plates 68, 70, 72 constituting the evaporator 42.
    [0013] Alternatively, the main plates 68 and secondary 70, 72 are made of aluminum. According to a variant not shown, the first auxiliary radiator 32 has the general shape of a cylindrical section open at each of its ends.
    [0014] According to another variant not shown, the first auxiliary radiator 32 has the general shape of a parallelepiped open at each of its ends. In all these embodiments, the first 32 and second 36 auxiliary radiators advantageously have main radiative faces 66 which extend in planes perpendicular to the first 7 and second 8 faces. The second embodiment of the invention of the spacecraft 75, illustrated in FIGS. 10 to 12, is similar to the first embodiment of the invention except that in this second embodiment the first 76 and the second 78 auxiliary heat transfer devices are reversible or otherwise bidirectional. The elements of the second embodiment which are identical or similar to the elements of the first embodiment will have the same references and will not be described a second time. The first auxiliary heat transfer device 76 of the second embodiment of the invention comprises a first heat exchanger 80 in thermal contact with the first auxiliary radiator 32, a second heat exchanger 82 in thermal contact with the internal face of the second radiator 18, and heat pipe 84 (heat pipe (HP)) connecting the first heat exchanger 80 to the second heat exchanger 82. Reversible fluid loops, in particular capillary fluid loops in which the reservoir fluid is integrated into the evaporator (in English "Loop Heat Pipe") reversible can be used. The first heat exchanger 80 and the second heat exchanger 82 are suitable for operation as an evaporator or as a condenser. In Figs. 10 and 11, the first 80 and second 82 heat exchangers are represented by a circle and a rectangle. The constituent elements of the second auxiliary heat transfer device 78 are identical to the constituent elements of the first auxiliary heat transfer device 76 and will not be described in detail. The first heat exchanger 80 of the second auxiliary heat transfer device 78 is in thermal contact with the second auxiliary radiator 36. The second heat exchanger of the second auxiliary heat transfer device is in thermal contact with the inner face of the first radiator 16 .
    [0015] With reference to FIGS. 10 and 12, the first auxiliary radiator assembly 32 and the first auxiliary heat transfer device 76 of the second embodiment of the invention ensure, during the winter solstice, the same function as the first radiator assembly. Auxiliary 32 and first auxiliary heat transfer device 34 of the first embodiment of the invention to cool the second radiator 18. This assembly provides more, during the winter solstice, an additional function of heating the first radiator 16 by transferring a quantity of energy Q2A from the second auxiliary radiator 36 to the inner main face 15 of the first radiator.
    [0016] As can be seen in FIG. 12, this heating function makes it possible to further reduce the temperature differences between the first 7 and second 8 faces during the winter solstice. In the same way, with reference to FIGS. 11 and 12, the second auxiliary radiator assembly 36 and the second auxiliary heat transfer device 78 of the second embodiment of the invention perform the same function as the second auxiliary radiator assembly 36. and second auxiliary heat transfer device 78 of the first embodiment of the invention namely cooling the first radiator 16. This assembly further ensures a heating function of the second radiator 18 by transferring a quantity of energy Q2B of the first auxiliary radiator 32 to the inner main face 21 of the second radiator. As can be seen in FIG. 12, this warming function makes it possible to reduce the temperature differences between the first 7 and second 8 faces during the summer solstice.
    [0017] Advantageously, in this second embodiment, the first and second auxiliary radiators are covered or painted with a coating with high solar absorptivity and high infrared emissivity, for example a black paint so that they can absorb the maximum of heat when exposed to solar radiation to be able to heat as much as possible the main radiator located in the shade while having good thermal rejection capabilities when they are in the shade The skilled person (who is a thermist space) is familiar with this type of material, which generally has a solar absorptivity well above 0.8, and an infrared emissivity well above 0.6 at the beginning of life. In the present description, for reasons of simplification, the North face has been called the first face and the North radiator has been called the first radiator. However, the operation of the device according to the invention is symmetrical so that the south face can also be called the first face and the southern radiator can also be called the first radiator.
    权利要求:
    Claims (11)
    [0001]
    CLAIMS1.- Spatial machine (1, 75) comprising: - a housing (2) delimiting an interior space (11) and an outside space (13), the housing (2) having a first face (7) and a second face ( 8) opposite to the first face (7), - a first radiator (16) and a second radiator (18) carried by the first face (7) and respectively the second face (8), the first radiator (16) and the second radiator (18) each having an inner main face (15, 21), an outer main face (17, 23) opposite to the inner main face (15, 21) and side faces (19, 25), characterized in that the spacecraft (1) further comprises a first auxiliary radiator (32) and a first auxiliary heat transfer device (34, 76) thermally connecting said first auxiliary radiator (32) to the inner main face (21) of the second radiator (18), the first auxiliary radiator (32) being arranged in a first portion (46) of the outer space (13) , said first portion (46) being delimited by the outer main face (17) of the first radiator and by first planes (48, 50, 52, 54) containing the side faces (19) of the first radiator.
    [0002]
    The spacecraft (1, 75) of claim 1, wherein said first auxiliary radiator (32) is thermally insulated from the first radiator (16).
    [0003]
    The spacecraft (75) according to any one of claims 1 and 2, which includes a second auxiliary radiator (36) and a second auxiliary heat transfer device (78) thermally connecting said second auxiliary radiator (36) to the internal main face (15) of the first radiator (16); said second auxiliary radiator (36) being arranged in a second portion (56) of outer space (13) delimited by the outer main face (23) of the second radiator (18) and by second planes (58, 60, 62, 64) containing the side faces (23) of the second radiator (18), and wherein the first auxiliary heat transfer device (76) and the second auxiliary heat transfer device (78) are reversible.
    [0004]
    4. A spacecraft (75) according to claim 3, wherein at least one of the first auxiliary radiator (32) and the second auxiliary radiator (36) is covered with a coating with high solar absorptivity and high emissivity. infra-red, for example black paint.
    [0005]
    5. Spatial vehicle (1, 75) according to any one of claims 3 and 4, wherein at least one of the first auxiliary radiator (32) and the second auxiliary radiator (36) comprises at least one radiative face main (66) extending in a direction perpendicular to the outer main face (23) of the first radiator.
    [0006]
    6. A spacecraft (1,75) according to any one of claims 1 to 5, wherein the first auxiliary radiator (32) comprises at least two plates (68,70,72) which intersect.
    [0007]
    7. Spacecraft (1.75) according to any one of claims 1 to 5, wherein the first auxiliary radiator (32) has the general shape of a cylindrical section open at each of its ends.
    [0008]
    8. A spacecraft (1, 75) according to any one of claims 1 to 5, wherein the first auxiliary radiator (32) has the general shape of a parallelepiped open at each of its ends.
    [0009]
    9. A spacecraft (1) according to any one of claims 1 to 8, wherein the first heat transfer device (34) is non-reversible.
    [0010]
    The spacecraft (1, 75) according to any one of claims 1 to 9, wherein the first auxiliary radiator (32) is made of a flexible material.
    [0011]
    11. A spacecraft (1, 75) according to claim 10, wherein the first auxiliary radiator (32) is made of graphoil.
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    法律状态:
    2015-12-30| PLFP| Fee payment|Year of fee payment: 2 |
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    申请号 | 申请日 | 专利标题
    FR1462687A|FR3030458B1|2014-12-18|2014-12-18|SPACE ENGINE|FR1462687A| FR3030458B1|2014-12-18|2014-12-18|SPACE ENGINE|
    PCT/FR2015/053504| WO2016097577A1|2014-12-18|2015-12-15|Spacecraft|
    CN201580069372.2A| CN107249984B|2014-12-18|2015-12-15|Spacecraft|
    EP15821121.9A| EP3212504B1|2014-12-18|2015-12-15|Spacecraft|
    JP2017532081A| JP6302603B2|2014-12-18|2015-12-15|Spaceship|
    US15/534,710| US10144534B2|2014-12-18|2015-12-15|Spacecraft|
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