JPS641200Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial technical field) The present invention relates to an improvement of a thermal louver that controls the amount of heat radiated from equipment mounted on an artificial satellite.

(Prior art) Generally, the structure that makes up the skeleton of an artificial satellite is covered with a heat insulating blanket to protect it from heat radiation from sunlight, etc. Because the temperature inside the body becomes abnormally low or, conversely, abnormally high due to heat radiation from sunlight or heat dissipation from onboard equipment, or temperature changes occur, a thermal louver is usually installed in a position facing the sunlight. Some devices are designed to control the temperature within the structure by radiating heat from the air, absorbing or reflecting radiant heat from sunlight, etc. An application of this kind has already been filed as Utility Model Application No. 1983-94232.

That is, one embodiment of this application is
To explain with reference to the figures and FIG. Two disk bodies 3 and 4 having holes 2 are pivotally attached to the same central shaft 5, and one disk body 4 is connected to the expansion of the bimetal spring 6.
It is configured to be deflated.

The bimetal spring 6 is connected to a power source 8 via a thermostat 7 provided on the controlled body 1.

Here, if the ambient temperature of the controlled object is higher than a predetermined temperature, the thermostat 7 is activated, causing the disc body 4 to rotate and open the through hole 2 of the disc body 3. Further, when the temperature is lower than the ambient temperature of the controlled object, the disc body 4 conversely closes the through hole 2.

Therefore, when the through hole 2 is open, heat from the controlled object is radiated to the outside through the through hole 2, and the temperature can be lowered to a desired temperature. Further, when the through hole 2 is closed, the heat radiation from the controlled object is prevented from being radiated to the outside by the disk body 3, so that the desired temperature can be maintained as much as possible. .

However, according to the above-mentioned previously filed application, the disk body itself that closes the through hole of the cover of the thermal louver has a slight heat radiation effect, and even when the through hole is opened, there is a loss of heat radiation due to the thermal louver itself. occurs, and the effective emissivity of this thermal louver is usually about 0.1 (when the thermal louver is closed) to 0.7 (when the thermal louver is open). For this reason, although the equipment generates heat especially at low temperatures, it is not possible to obtain the temperature necessary for controlling the ambient temperature of the equipment, so a separate heating source such as a heater is installed and We had no choice but to take measures such as making it work.

(Problem to be solved by the invention) The above-mentioned drawbacks of the conventional method have been eliminated by adding heat dissipation and heat retention functions by making it possible to appropriately close the through holes with the first and second reflecting plates. It is something.

[Structure of the idea]

(Means for solving the problem) In contrast to conventional thermal louvers that control heat dissipation using a single reflective plate, a thermal louver that is pivoted parallel to this reflective plate (first reflective plate) and spaced a little apart is used. and as the ambient temperature of the controlled object becomes higher than a predetermined temperature, these reflectors are rotated in one direction to increase the heat dissipation rate, and when the ambient temperature falls to a predetermined temperature, the The first reflector is rotated in the other direction to control heat radiation, and as the ambient temperature of the controlled object becomes lower than the predetermined temperature, the second reflector is rotated in the other direction.
Only the reflector plate can be rotated in the other direction.

(Function) Therefore, when the ambient temperature of the control device is, for example, 30°C or higher, the first and second reflectors are opened and heat is efficiently radiated from the control device.
When the ambient temperature is around ±0°, only the first reflecting plate closes to suppress heat radiation from the control equipment, thereby maintaining the desired ambient temperature.
And the second reflecting plate is closed, and rather works to keep warm. Even if the ambient temperature of the control device changes in various ways due to various causes, the range of effective emissivity from the device to the outside can be widened, so a wider range of control is possible.

(Embodiment) An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. Reference numeral 11 denotes a thermal louver installed at a predetermined position in the structure (not shown) of an artificial satellite. The thermal louver 11 is disposed opposite to a controlled body consisting of various equipment installed, and when the ambient temperature of the various equipment rises, the thermal louver 11 is opened to dissipate heat generated from the various equipment to the outside of the structure. It is. This thermal louver 11 includes a cover 12 with fan-shaped through holes 12a provided in four places on the front surface radially from a center point The first and second
reflectors 13 and 14, and these first and second reflectors 13 and 14.
first and second bimetals 15 and 16 formed in a spiral shape to generate a driving force so that the reflecting plate can be rotated about the center point X;
It is composed of: 17 is a pivot of the first and second reflecting plates 13 and 14;
One end thereof is connected to the shaft portion 13a of the first reflecting plate 13 and held by a bearing 12b, and the other end is connected to the cover 12, the first and second reflecting plates 13 and 14, and the first and second reflecting plate 13. It is designed to be held on a pedestal 18 that supports bimetals 15 and 16. Reference numeral 19 denotes a support rod whose base portion is fixed to the pedestal 18, and supports the fixed portions of the first and second bimetals, respectively.

The movable portion of the first bimetal 15 is connected to the pivot shaft 17, and the expansion and contraction action of the first bimetal 15 causes the first reflecting plate 13 to move.
can rotate within a range of approximately 45°.
The movable part of the second bimetal 16 is connected to the shaft part 14a of the second reflection plate 14, and the expansion and contraction action of the second bimetal 16 causes the second reflection plate 14 to move toward the first reflection plate 14. Like the reflector 13, it is designed to rotate within a range of approximately 45 degrees. The first reflector 13 has four blades 13 so as to substantially cover the through holes 12a of the cover 12.
b... By rotating this by approximately 45 degrees, the blade portions 13b... can be moved to open or close the through holes 12a... Said second reflecting plate 14
Like the first reflecting plate 13, the plate has four blades 14b, and by rotating it approximately 45 degrees, the blades 14b open or close the through holes 12a. It is becoming possible to do so. The first and second bimetals 15 and 16 have different operating characteristics, and the first reflecting plate 13 operates at about +10° C. to completely close the through hole 12a of the cover 12, This state is maintained even if the temperature further decreases. Next, when the temperature reaches about ±0℃, the second reflector 1
4 operates to double close the through hole 12a. t between the cover 12 and the first reflecting plate 13, and the distance between the first reflecting plate 13 and the second reflecting plate 13.
t' with respect to the reflecting plate 14 is kept as small as possible in relation to the so-called view factor, which is the degree to which the light incident from the through hole 12a is blocked by the first or second reflecting plate 13 or 14. I have to.

In addition, 20... is a thermal louver mounting window a (fourth
This is a hole for inserting a rivet to be attached to the hole (illustrated in phantom line).

However, when a thermal louver configured in this way is attached to the structure of an artificial satellite and used, the ambient temperature of onboard equipment b (shown by the imaginary line in Figure 4) may increase due to absorption of sunlight or heat generation of onboard equipment b itself. If the ambient temperature exceeds 30℃, the first and second
The bimetals 15 and 16 operate to rotate the first and second reflecting plates 13 and 14, and the cover 12
The through hole 12a is fully opened facing the mounted equipment b. In this way, the radiant heat from the mounted equipment is radiated to the outside as indicated by the arrow in FIG.

Therefore, the temperature of the mounted device b itself decreases, and the ambient temperature also decreases to 30° C. or less. When the ambient temperature drops to around 10 degrees Celsius, such as when the incidence of sunlight is interrupted, the first reflecting plate 13 rotates approximately 45 degrees, and the blade portions 13b close the through holes 12a of the cover 12. . As a result, most of the radiant heat from the equipment is blocked from the outside by the blade portions 13b. Therefore, although heat radiation is suppressed, the ambient temperature tends to gradually rise due to the heat generated from this device. However, in this state,
Since it is isolated from the outside by one blade part 13b, the effective emissivity as a thermal louver is approximately 0.1 at this time, so to speak, as in the case of the above-mentioned existing application, and this emissivity allows heat to be radiated. At the same time, the ambient temperature will change. Next, when there is no sunlight for a long time and there is no heat generation due to equipment being stopped, etc., the ambient temperature may be within ±
When the temperature drops to about 0° C., the blade portion 14b of the second reflecting plate 14 further rotates approximately 45° so as to match the blade portion 13b of the first reflecting plate 13.
Therefore, the through holes 12a of the cover 12 are blocked by the blade portions 13b and 14b of the first and second reflecting plates 13 and 14. In this state, most of the heat radiated from the equipment is first reflected from the blade portion 14b, but the portion with an effective emissivity of about 0.1 is radiated from the blade portion 14b to the blade portion 13b, where the majority of the heat is further reflected. is reflected. That is, due to the superposition of these two blade portions 14b and 13b, the effective emissivity was further reduced, and according to one experimental example, it was halved to 0.05 compared to the case of a conventional single reflecting plate. Therefore,
As a result, almost no heat generated from the equipment is radiated to the outside through the reflecting plates 13 and 14 (that is, heat is retained), so that the ambient temperature is maintained by the heat generated.

[Effect of idea]

According to the present invention, as described above, the first reflector plate and the second reflector plate are provided for the heat dissipation hole, and each acts jointly depending on the state of the ambient temperature of the device. Since the configuration allows for a wider effective emissivity from the equipment to the outside, heat radiation and heat retention can be performed efficiently and steplessly even when the ambient temperature of the equipment changes variously due to various causes. Not only is it possible to maintain the desired ambient temperature as much as possible even when the ambient temperature drops to a fairly low temperature range, so it is possible to prevent satellite equipment from malfunctioning due to abnormal ambient temperatures. This has the effect of preventing malfunctions or malfunctions from occurring.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the thermal louver of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, FIGS. 3 and 4 are views showing conventional examples, and FIG. A perspective view of the main body, Fig. 4a is a top view of the thermal louver main body, and Fig. 4b is a B--B of Fig. 4a.
FIG. 3 is a sectional view taken along line B'. 11...Thermal louver, 12...Cover, 1
2a...Through hole, 13...First reflecting plate, 14...
Second reflector, 14b...Blade portion, 15...First
bimetal, 16...second bimetal, 17
...Axis, 18...Pedestal, 19...Support rod.

Claims (1)

[Scope of utility model registration request] A cover having a heat radiation aperture provided to cover the controlled object, and a cover that faces the aperture of the cover at a short distance and can be rotated to close and open the aperture. a first reflecting plate having a shape that allows the first reflecting plate to be formed; and a second reflecting plate that substantially matches the shape of the first reflecting plate and is rotatably supported parallel to the first reflecting plate and spaced apart from the first reflecting plate. a reflector, and the first reflector to drive the first and second reflectors.
and a second bimetal that operates according to the ambient temperature of the controlled object attached to each shaft portion of the second reflecting plate, and as the ambient temperature of the controlled object becomes higher than a predetermined temperature, the The first and second reflecting plates are rotated in one direction by the action of the first and second bimetals, thereby opening the through hole of the cover, and the ambient temperature of the controlled object is brought to the predetermined temperature. When the ambient temperature of the controlled object becomes lower than the predetermined temperature, the first reflecting plate is rotated to the maximum in the other direction to close the opening of the cover and stopped. A thermal louver characterized in that only the second reflecting plate rotates in the other direction.