JP2000211599A - Thermal louver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure a proper arrangement to meet with the size and shape of a radiator of an artificial satellite by constructing a module by a method of surrounding at least a specified number of blade and a specified number of bimetal coil and a specified number of shaft to turn the blades by a frame. SOLUTION: In a housing 5 at least one bimetal coil 2 and at leat one sheet of blade 3 are supported mechanically through a shaft 4. A frame 6 is composed of them, a lateral frame provided in the axial direction of the shaft 4 so as to support a module with respect to a lod in the thrust direction of the shaft 4, and a vertical flame coupled with the lateral frame while supporting the shaft 4. The module is composed of the frame 6. With the constitution, a plurality of louvers moduled are arranged on a radiator in the direction vertical to the axis of the shaft 4, thereby making the area of heat radiation a size as requested to meet with different sizes and shapes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal louver (Th) for controlling a heat release amount in response to heat generation and a thermal environment inside a spacecraft such as an artificial satellite or a space station.
(Emeral Lauber: Hereinafter, simply referred to as a louver)
Regarding improvement. The artificial satellite controls the temperature of the equipment by radiating the heat of the equipment mounted inside the radiator (radiator plate) provided on the satellite structure by radiating heat to outer space. It fluctuates with operation. In addition, the satellite receives the direct sunlight in the sun in orbit and the absolute zero degree (−273) in the shade of the earth without the heat input of the sunlight.
(° C). The louver is designed to automatically control the amount of heat radiated from the radiator in response to the orbital thermal environment and the equipment heat generated by the above-mentioned large fluctuations, and to control the equipment inside the artificial satellite to an appropriate temperature. A louver is a so-called variable efficiency radiator that is installed on the surface of a radiator (radiator plate) of an artificial satellite and controls the amount of heat radiation by detecting the temperature of the radiator and automatically opening and closing multiple blades arranged in a shutter shape. Moreover, the operating principle is relatively simple, and a large change in heat radiation efficiency can be expected.

[0002]

2. Description of the Related Art In FIG. 11, reference numeral 1 denotes a radiator (heat radiator) provided on the surface of a structure of an artificial satellite. Dissipates heat to outer space. Reference numeral 2 denotes a bimetal coil arranged side by side on the radiator 1, which detects the temperature of the radiator (radiator plate) and generates a rotational force. Reference numeral 3 denotes an aluminum alloy blade that is juxtaposed on the radiator (radiator plate) 1 and is rotated by a bimetal coil.
When the blade is closed, its surface is mirror-finished so as to block heat radiation from the radiator. 4 is a shaft of the blade 3, 5 is a housing for mechanically supporting the bimetal coil 2 and the shaft 4, and 6 is a frame for mechanically supporting the other end of the shaft. Reference numeral 7 denotes a multilayer heat insulating material (Multi Layer Insulator) attached to the outside of the frame 6.
ion. Hereinafter, it is abbreviated as “MLI”. ), And functions to suppress heat leakage from the side surface of the louver when the blade is closed. FIG. 12 shows the configuration of the blade 3. The blade has a structure in which two upper and lower sheet metal processing end plates are bonded with an adhesive, and a shaft 4 is provided at both ends.
Are attached so that coaxiality can be obtained. The louver is composed of the above 2 to 7 parts.

The bimetal coil 2 which has detected a temperature change of the radiator (radiator plate) 1 undergoes thermal deformation, and opens and closes the blade 3 by converting the thermal deformation into a rotational force. When the temperature of the radiator (radiator plate) 1 is high, the blade 3
Opens to release heat, and when the temperature is low, the blade 3 closes to prevent heat release. As a result, it is possible to prevent the temperature of the device from being excessively lowered at the time of low temperature, and to reduce the electric power for the heater for low temperature protection.

[0004]

The size and shape of the louver are determined by the amount of heat generated by the device.
The shape of the radiator (radiator plate) 1 which is determined according to the size of the radiator 1 and the arrangement of the heat-generating devices is limited,
Existing louvers have only a few standard sizes and shapes that are guaranteed in outer space and are standardized, and they must be properly arranged according to various sizes and shapes of radiators (radiator plates) of satellites. There was a problem that can not be. In this case, if a large louver is selected for the radiator (heat radiator) 1, problems such as mountability and weight increase occur, and a small louver for the radiator (heat radiator) is selected. In this case, even when the blade of the louver is closed at low temperatures, heat radiation from the radiator that protrudes from the louver cannot be cut off, so that the louver alone cannot sufficiently prevent the temperature of the device from dropping.
There was a problem that a heater for low-temperature protection had to be provided. In FIG. 10A, the hatched portion 1 is a radiator (radiator plate) provided on the satellite structure, 11 is an existing small louver, 12 is an existing large louver, ANT is an antenna, and an existing small louver is used. Two louvers and one large louver
The radiator is arranged in accordance with the radiator by combining the tables. However, since the area of the radiator is considerably large, a heater is provided inside. (B) is a cross-sectional view (as viewed from the rear side of the paper of FIG. 10 (a)) showing the arrangement of internal heating devices, 13 is a heating device, and 14 is a low-temperature protection heater.

[0005] Further, when sunlight enters the inside of the louver with the blades opened, there is another problem that the temperature of the frame rises and the heat radiation capability of the radiator (radiator plate) decreases.

Furthermore, the blade has a problem that the manufacturing cost is high due to the mirror finishing and the cost of the entire louver is high. SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has been made in consideration of a radiator (radiator plate) for an artificial satellite.
Thermal and thermal
The aim is to get a louver.

[0007]

According to the first aspect of the present invention, there is provided a thermal imaging apparatus comprising:
The louver has a plurality of bimetal coils arranged side by side on a heat sink provided on the surface of the structure of the satellite, a plurality of plate-like blades rotated by each of the bimetal coils, and a shaft having the respective blades. A thermal louver comprising a frame rotatably supporting the shaft, wherein the frame is disposed parallel to the axial direction of the shaft and has a lateral side frame provided with a through hole, and a vertical frame rotatably supporting the shaft. A frame formed from a side frame, comprising: a module including at least one blade, at least one bimetal coil for rotating the blade, and a shaft surrounded by the frame, wherein the module is provided on a heat sink. It is arranged.

According to a second aspect of the present invention, there is provided a thermal louver comprising: a plurality of bimetal coils arranged in parallel on a heat sink provided on the surface of a structure of an artificial satellite; and a plurality of plate-like coils rotated by the bimetal coils. A louver comprising a frame and a frame rotatably supporting the respective blades via a shaft, wherein the lateral side frame provided with a through-hole disposed parallel to the axial direction of the shaft and the shaft are provided. A first frame formed of a vertical side frame rotatably supported, at least one blade, at least one bimetal coil for rotating the blade, and a shaft;
A first module surrounded by a frame, a metal tube-shaped lateral side frame arranged in parallel with the axial direction of the shaft, and a vertical side frame rotatably supporting the shaft. A second module comprising a frame, at least one blade, at least one bimetal coil for rotating the blade, and a shaft surrounded by the second frame; and separating the first module on a heat sink. And two or more second modules are arranged so as to be sandwiched between the first modules.

According to a third aspect of the present invention, in the thermal louver according to the first or second aspect, the module has at least two blades arranged in series in a longitudinal direction thereof and supported by the frame. .

A thermal louver according to a fourth aspect of the present invention is the thermal louver according to the first to third aspects, wherein the lateral side frame is formed of a paint, a tape material or the like having a surface thermo-optical characteristic having a small solar absorptivity and a large infrared emissivity. It is what was coated with.

According to a fifth aspect of the present invention, in the thermal louver according to the first to fourth aspects, the blade is covered with a multilayer heat insulating material.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 shows a louver according to a first embodiment of the present invention. The bimetal coil 2, the blade 3 and the shaft 4 are the same as those of the conventional apparatus. It is made to be able to cope. Reference numeral 5 denotes a housing for mechanically supporting the bimetal coil and the blade via a shaft. Reference numeral 6 denotes two housings provided in parallel to the axial direction of the shaft 4 so as to support the module against a load in the thrust direction of the shaft. This is a frame composed of a lateral side frame and a vertical side frame that supports the shaft 4 and is vertically coupled to the lateral side frame. When the louver is modularized, the frame of each module arranged in accordance with the radiator has a problem that the radiation view of the radiator is obstructed, the radiation efficiency is reduced, and the modularization increases the weight. By providing a large number of through holes in the lateral side frame, the area in which the frame of each module blocks the radiation view of the radiator is minimized, and the increase in weight due to modularization is suppressed. The axial dimension of the blade depends on the mechanical strength of the module and the rotational force generated when the bimetal coil overcomes the friction, but has a degree of freedom within the allowable range of the conditions described on the left. Further, a plurality of louvers modularized in a direction perpendicular to the axis of the shaft 4 are arranged on the radiator (heat radiating plate) 1 so that the heat radiating area is set to a required size. 2A and 2B are views as viewed from the axial direction of the blade. FIG. 2A shows a heat radiation field of view of a conventional louver that is not modularized, and FIG. 2B shows a heat radiation field of view when a plurality of modularized louvers are arranged. Reference numeral 1 denotes a radiator (radiator plate), and a broken line indicates that a thermal control coating is applied to the surface to increase the infrared emissivity to facilitate heat radiation. Reference numeral 7 denotes an MLI (multilayer heat insulating material) that blocks heat leaks from components other than the radiator 1. Numeral 15 indicates the angle of the heat radiation field of the conventional louver, and numeral 16 indicates the heat radiation field of the modularized louver. When the frame 6 is modularized without forming many holes in this manner, the frames arranged in a partition on the radiator 1 obstruct the heat radiation field of view and reduce the heat radiation capability of the radiator.
However, in this embodiment, by providing a large number of through-holes in the frame 6, it is possible to prevent a decrease in the heat radiation capability of the radiator due to modularization.

Embodiment 2 FIG. FIG. 3 shows a louver according to a second embodiment of the present invention. Numeral 8 denotes a metal tubular frame provided two in parallel with the blade 3 and mechanically supporting the module. The outer diameter of the tubular frame should be as small as possible to minimize the area that blocks the heat radiation field of view of the radiator, and it should be placed at a high position.The outer diameter of the tube should also prevent deformation of the frame due to the load in the thrust direction of the shaft. And determine the height. Further, the adoption of the tubular frame facilitates the design and manufacture because the frame has a simple shape even when the axial dimension of the blade is changed in design in accordance with the radiator size. The configuration other than the frame is the same as that of FIG. FIG. 4 is a view of the arrangement of the radiator in combination with the modules of FIGS. 1 and 3 viewed from the axial direction of the blade. FIG. 4A shows the blade in an open state, and FIG. It shows the state that it was turned on. The module shown in FIG. 2 is required to increase the radiation efficiency of the radiator (radiator plate) 1 when the louver is open. However, since the MLI cannot be attached to the tubular frame, the frame is closed when the blade is closed. Heat leakage from the side surface occurs, and the heat insulation performance in the closed state decreases. Therefore, the module of the type of FIG. 1 and FIG. 3 are used together, and the module of the type of FIG. 1 is arranged at both ends, and the module of the type of FIG. The improvement of both the heat dissipation efficiency in the case and the heat insulation performance in the closed state is aimed at. In this case, the frame 6 in the module of the type of FIG.
By attaching I7, heat leakage from the through hole can be prevented.

Embodiment 3 FIG. 5 shows a louver according to a third embodiment of the present invention, in which two blades 3 are used and two modules are connected in series in the axial direction of a shaft 4 to form a module. It is made possible. Configurations, operations, and effects other than those described on the left are the same as those in FIG.

Embodiment 4 FIG. 6 shows a louver according to a fourth embodiment of the present invention, in which two blades are used to connect two modules in series in the axial direction of the shaft 4 to form a module, which can be used for a relatively large radiator 1. In addition, the frame is formed in a tube shape. Except that the number of blades is two, the configuration, operation, and effects of this module are the same as those in FIG.

Embodiment 5 FIGS. 7A to 7C show a louver according to the fifth embodiment of the present invention. The louver shown in FIG. 7 is combined with the single blade module shown in FIG. 3 and the two blade module shown in FIG. It is shown that the radiator (radiator plate) 1 having an appropriate size and shape can be arranged in accordance with the radiator (radiator plate) 1.

Embodiment 6 FIG. 8 shows the first to fifth embodiments.
FIG. 16 is a view showing a louver according to a sixth embodiment of the present invention applied to the louver shown in FIG. The frame with the heat control coating 17 is obtained by applying a heat control coating to the frame of the module shown in FIG. 1, and the tube frame 18 with the heat control coating is formed by applying the heat control coating to the tube frame of the module shown in FIG. It is coated. Also,
19 indicates the heat input of sunlight. When a louver is mounted on the surface where sunlight enters, the metal frame of the louver has a higher solar absorptivity than the infrared emissivity, so the temperature of the frame becomes high, and the radiator (radiator plate) 1 can dissipate heat. Lower. Therefore, the coating suppresses a rise in the temperature of the frame when sunlight enters, thereby suppressing a decrease in the heat radiation capability of the radiator.

Embodiment 7 FIG. 9 shows the first to sixth embodiments.
A louver blade according to a seventh embodiment of the present invention which is applied to the louver shown in (1), (4) (a) is the same shaft as that of the conventional device. Reference numeral 9 denotes a blade made of MLI (multilayer heat insulating material), which has a structure in which the upper and lower MLI are sewn with a thread or fixed by taping. Reference numeral 10 denotes a blade support frame that mechanically supports the blade. (B) is a view showing a cross section of (a), and 9 (a)
Is a heat insulating film constituting the MLI, and 9 (b) is a heat insulating net inserted between the respective layers in order to suppress heat leakage due to conduction between the heat insulating films. MLI is a material that is used in large quantities to insulate the satellite body from outer space, and its cost has been reduced. Therefore, by changing the material of the blade from an aluminum mirror plate to the MLI, the manufacturing cost of the blade is reduced. Reduction and weight reduction can be achieved.

[0019]

According to the first aspect of the invention, the louvers are modularized and mounted in plural numbers according to the size and shape of the radiator (radiator plate), so that radiators of different sizes and shapes can be handled. Therefore, it is possible to suppress a decrease in the heat radiation capacity of the radiator and an increase in weight due to the formation of the radiator. Further, the manufacturing cost can be reduced as compared with the case where a louver is developed for each radiator.

According to the second aspect of the present invention, since the frame is formed in the shape of a tube, a decrease in the heat radiation capability of the radiator can be suppressed, and an increase in the weight of the louver due to modularization can be suppressed. In addition, since the frame has a simple shape of a tube, the design and manufacturing can be facilitated even when the axial dimension of the blade is changed in accordance with the radiator, and the cost can be reduced.

According to the third aspect of the present invention, by applying a thermal control coating to the frame supporting the blade to have a surface thermo-optical characteristic having a small solar absorptivity and a large infrared emissivity, the solar light is supplied to the inside of the louver. In this case, it is possible to prevent the temperature of the frame from rising when the light is incident on the radiator and to reduce the heat radiation capability of the radiator.

According to the fourth aspect of the present invention, by eliminating the mirror finish of the blade and using a multilayer heat insulating material such as MLI, the blade manufacturing cost can be reduced while maintaining the heat insulating performance of the louver when the blade is closed. The weight can be reduced as well as lowered.

According to the fifth aspect, by arranging at least two blades constituting one module in series, it is possible to cope with a relatively large radiator.

[Brief description of the drawings]

FIG. 1 is a diagram showing Embodiment 1 of a thermal louver according to the present invention.

FIG. 2 is a diagram showing Embodiment 1 of a thermal louver according to the present invention.

FIG. 3 is a diagram showing a second embodiment of the thermal louver according to the present invention;

FIG. 4 is a view showing a second embodiment of the thermal louver according to the present invention;

FIG. 5 is a diagram showing a third embodiment of the thermal louver according to the present invention.

FIG. 6 is a view showing a fourth embodiment of a thermal louver according to the present invention.

FIG. 7 is a view showing a fifth embodiment of a thermal louver according to the present invention.

FIG. 8 is a view showing a sixth embodiment of the thermal louver according to the present invention.

FIG. 9 is a diagram showing a seventh embodiment of the thermal louver according to the present invention;

FIG. 10 is a view showing a conventional thermal louver.

FIG. 11 is a view showing a conventional thermal louver.

FIG. 12 is a view showing a blade of a conventional thermal louver.

[Explanation of symbols]

1 radiator, 2 bimetal coil, 3 blade, 4 shaft, 5 housing, 6 frame, 7
MLI, 8 tubular frame, 9 MLI blade, 9 (a) heat insulation film, 9 (b) heat insulation net,
10 Blade support frame, 11 Small louver, 12
Large louver, 13 Heating equipment, 14 Heater, 15
Conventional louver heat dissipation viewing angle, 16 louver module heat dissipation viewing angle, 17 frame with thermal control coating, 18
Tubular frame with thermal control coating, 19
Sun light.

Claims (5)

[Claims] 1. A plurality of bimetal coils arranged in parallel on a radiator plate provided on the surface of a structure of an artificial satellite, a plurality of plate-like blades rotated by the respective bimetal coils, and the respective blades A frame that rotatably supports the shaft via a shaft, the frame rotatably supports the lateral side frame provided with a through-hole disposed in parallel with the axial direction of the shaft and the shaft. A frame comprising at least one blade, at least one bimetal coil for rotating the blade and a shaft surrounded by the frame, wherein the module is mounted on a heat sink. A thermal louver, which is arranged in plural. 2. A plurality of bimetal coils arranged side by side on a heat sink provided on the surface of a structure of an artificial satellite, a plurality of plate-like blades rotated by the respective bimetal coils, and the respective blades A louver comprising a frame rotatably supporting the shaft via a shaft, a lateral side frame provided in parallel with an axial direction of the shaft and having a through hole, and a vertical side frame rotatably supporting the shaft. First formed from
A frame, at least one blade, at least one bimetal coil for rotating the blade, and a first module comprising a shaft surrounded by the first frame, and arranged in parallel to the axial direction of the shaft. A second frame formed of a metal tube-shaped lateral frame and a vertical frame rotatably supporting the shaft, at least one blade, and at least one bimetal coil and a shaft for rotating the blade; A second module surrounded by the second frame and two first modules separated in parallel on a heat sink, and the second module sandwiched by the first module; A thermal louver characterized by the arrangement of a plurality of thermal louvers. 3. The lateral frame according to claim 1, wherein the lateral side frame is thermally controlled coated with a paint or a tape material having a surface thermo-optical characteristic having a small solar absorptivity and a large infrared emissivity. Thermal louver according to crab. 4. The thermal louver according to claim 1, wherein the blade is covered with a multilayer heat insulating material. 5. The thermal louver according to claim 1, wherein the module has at least two or more blades arranged in series in a longitudinal direction thereof and supported by the frame.