JPS6142680B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pinwheel type thermal louver that is used for temperature control of equipment mounted on an artificial satellite and is equipped with a blade that changes emissivity.

Generally, a thermal louver is attached to the outer surface of an artificial satellite, etc., and a fan-shaped or blind-shaped blade is rotated by driving torque caused by temperature changes in a spiral bimetal, controlling the amount of heat radiation from the thermal louver mounting surface to space. It is an element that controls the temperature of electronic equipment inside the satellite.

Conventionally, the pinwheel type thermal louver
As shown in the perspective view and the enlarged cross-sectional view of FIG. A blade 2 was provided, and the blade 2 was configured to be rotated by a bimetal 4. This panel 1 is thermally black, and the blade 2 is made of polished metal that thermally reduces emissivity.By covering the panel 1, the blade 2 reduces the heat radiation amount of the thermal louver and exposes the panel 1. This is a device that increases the amount of heat dissipation. This pinwheel type thermal louver can be manufactured more easily than a blind type thermal louver as shown in Fig. 3 because it directly uses the satellite envelope panel 1, and also allows sunlight to enter the thermal louver. When using a blind thermal louver, there is no effect of the cavity that occurs in blind-type thermal louvers, that is, the phenomenon in which all of the reflected light on the blades and base (panel) is absorbed by the blades and base, and it has the advantage of being able to use sunlight stably. Ta.

However, since this pinwheel type thermal louver has a structure in which the blade 2 moves in a plane, the range of change in the exposed area of the base of the panel 1 is less than half that of the blind type thermal louver, and the range of change in its effective emissivity. It was also narrow and had the disadvantage that the area of the base could not be fully utilized. For this reason, it is inappropriate to use pinwheel-type thermal louvers for satellites with large fluctuations in internal heat generation or satellites with large fluctuations in orbital heat input.

An object of the present invention is to eliminate such drawbacks and provide a pinwheel type thermal louver in which the range of change in effective emissivity is expanded by opening and closing the blades in a fan shape.

The present invention will be explained in detail below with reference to the drawings.

4a and 4b are front views of the blade in the embodiment of the present invention when the blade is opened and closed, and FIG. 5 is a side sectional view of FIG. 4. In the figure, the same numbers as in FIG. 2 indicate the same components, 8 is the blade used in the present invention, 7 is the blade used in the present invention.
is a frame that prevents the blade 8 from rising. In this embodiment, the blade 8 is opened and closed like a fan in order to eliminate the drawback that the effective emissivity variation range of the pinwheel type thermal louver is narrow. , blade 8 covers all of panel 1 to minimize the effective emissivity, and when blade 8 is closed, the fourth
As shown in Fig. b, the panel 1 is exposed to the maximum extent to maximize the effective emissivity, and the range of change in the effective emissivity as a thermal louver is widened.

FIGS. 6a and 6b are an enlarged side view and a front view of the single blade of this embodiment. This blade 8 has a trapezoidal shape and consists of a large end 9 and a small end 10, each of which is wound round.
It is large enough to enclose 0. This blade 8
As shown in Figure 7, many pieces are joined together,
It has a structure with bent parts. The material of this blade is aluminum, the inner surface is buffed, and the outer surface is coated with so-called aluminized Kapton, which is vacuum-deposited aluminum on Kapton, to prevent the blade from increasing in temperature when sunlight hits it.

FIGS. 7a and 7b are a perspective view and a cross-sectional view of the assembled blades, each of which is joined in such a way that the large winding at the large end 9 wraps around the small winding at the small end 10. As shown in FIG. 7a, the connections between these blades are attached by sliding in the vertical direction, and are structured so that they do not fall off in the horizontal direction. In Fig. 7b, when the blade is fully opened, the entire blade is not completely flat, and the angle θ between the blades is approximately 150° to give it unevenness.
This is because if the entire blade is completely flat when the blade is fully opened, local convexities are prevented from being formed on the blade when the blade is closed. Note that an inverted L-shaped frame 7 is provided at the outer end of the thermal louver to prevent the blade from rising when the blade closes.

According to the blade of the present invention, the area where the base is exposed is larger and the effective emissivity is also larger than when the conventional blade is fully closed.

In addition to the blade joining structure of this embodiment, as shown in Fig. 8, as a bent part,
There is also a structure in which a piece of paper, Kapton, plastic, etc. is creased and then opened and closed like a folding fan.

As explained above, by making the blades of the pinwheel type thermal louver fan-shaped, the area utilization efficiency of the base covered by the blind is good, and as a result, the range of change in the effective emissivity is even greater than that of the blind type thermal louver. It is about the same level, and
It is structurally simpler than a blind type thermal louver.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional thermal louver, Figure 2 is a perspective view of a conventional thermal louver.
The figure is a sectional view of FIG. 1, FIG. 3 is a perspective view of another conventional thermal louver, FIGS. 6a and b are an enlarged side view and a front view of the single blade in FIG. 4, and FIGS. 7a and b are a perspective view and a sectional view of the blade in FIG. 6 when assembled,
FIG. 8 is a perspective view of a blade according to another embodiment of the present invention. In the figure: 1... Exterior panel, 2, 5, 8... Blade,
3...Blade cover, 4...Bimetal, 7...
...Frame, 9...Large end, 10...Small end, 1
1...Artificial satellite, 12...Cover.

Claims (1)

[Scope of Claims] 1. An outer cover panel that is to change the emissivity of an artificial satellite, etc. in an open state is covered in a circular shape, and bent portions are provided in a plurality of radial directions from the center of this circular covered portion. a blade arranged so that at least one part of the part can be separated and a predetermined area of the outer covering panel is exposed in a closed state in the circumferential direction of the circularly covered part; A pinwheel type thermal louver comprising: a bimetal whose opening and closing are controlled at the center of the circular covered part. 2. The blade is composed of a plurality of single blades made of trapezoidal aluminum or the like divided by the bent portion, and two adjacent sides of the plurality of single blades are connected to each other except for the part where the blades can be separated. The pinwheel type thermal louver according to claim 1, wherein one end of the two sides is wound round to wrap around the other end. 3. The pinwheel type thermal louver according to claim 1, wherein the blade is made of paper, Kapton, plastic, etc., and the bent portion is formed by adding a crease to the blade.