JPS591994A - Heat pipe for temperature control - Google Patents

Abstract

PURPOSE:To regulate and control a radiating side to a predetermined temperature by a method wherein an auxiliary heater is provided in the heat pipe for controlling the temperature of a satellite or the like. CONSTITUTION:Heat, generated from a heating body 1 in the satellite, is transmitted to the radiating plate by the heat pipe 4 consisting of a wick 2 and a refrigerant 3 and is radiated into the space of cosmos. The radiating side is exposed to the space of zero degree of absolute temperature, therefore, the refrigerant 3 at the radiating side is solidified. Therefore, in case it is not necessary to radiate the heat generating in the satellite, the heat pipe is not operated, however, in case it is necessary to radiate the heat, the radiating side of the heat pipe 4 is heated by the auxiliary heater 6 and thereby regulating the temperature of the radiating side so as not to be lowered below the temperature of the solidifying point thereof. The input of the auxiliary heater 6 is determined and controlled by the operation of a micro-computer or a thermal switch made by bimetal based on a condition whether the necessity of the heat radiation is existing or not or the temperature of the radiating side is lower than the melting point of the refrigerant 3 or not.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a heat pipe, and particularly to a heat pipe for temperature control that is optimal for artificial stars and the like.

[Prior art and its problems]

Thermal control of artificial satellites has traditionally been based on the so-called passive thermal control method, which controls the temperature of onboard electronic equipment within an acceptable range by selecting coating materials and using insulation materials.
In this method, there is a limit to the heating power tfvat4@.

On the other hand, in order to cope with the increase in power consumption due to three-axis attitude control of the satellite and the narrowing of the required stability range of the onboard aircraft 4 to improve reliability, further High and low heat control functions are now required.

In response to the above requirements, the Gas Heat Quiz was developed as an active thermal control element for space use. This is done by filling the end of the condensing section with a certain amount of non-condensable gas, so that the condensation of the refrigerant does not become stale, and the conductance of the heat pipe is changed to i=r. In this way, the heat pipe not only conveys the heat input given from the heating section to the heat dissipation section, but also adjusts to fluctuations in heat input and changes in trajectory conditions, and increases the effective number of heat sections. change,
It should be possible to keep the IM If of the heating section constant.

However, with this method, (1) the structure of the heat pipe becomes complicated, such as having a gas reservoir, and sophisticated manufacturing technology is required; and (2) the responsiveness of the heat pipe cannot be controlled externally. It has the following drawbacks.

[Purpose of the invention]

The object of this invention is to provide a heat pipe for temperature control N which has a simple structure and whose capacity can be easily controlled from the outside, avoiding the complication of the structure as described above.

[Summary of the invention]

The present invention will be explained based on examples. FIG. 1 shows an embodiment of the invention.

When it is necessary to radiate the heat of the heating element 1 to the outside, the heat is transmitted to the υ heat radiating plate 5 by the heat pipe 4 which is connected to the wick 2 and the refrigerant 3, and is radiated to the outside. In the first step, the necessary amount of heat is added from the auxiliary heater 6 to the heat radiation side. This necessary amount is because the heat dissipation side is originally exposed to the absolute zero temperature in outer space, so the refrigerant 3 is solidified. Second, when there is no need to dissipate heat, the auxiliary heater 6 is not activated, and the heat pipe is not activated, so there is very little heat transfer. In the opposite case, the auxiliary heater 6 heats the heat radiation side so that the temperature does not drop below the melting point of the refrigerant.

At this time, the input to the auxiliary heater 6 is determined based on whether there is a necessity for heat radiation based on the temperature of the heating element and whether the degree of cooling on the heat radiation side is below the melting point of the refrigerant. This judgment can be applied to thermal switches using bimetals or simple microcontrollers.

〔Effect of the invention〕

According to the present invention, the structure of the heat pipe remains the same as before;
A razor-shaped heat pipe can be configured by simple external operation. In addition, the power supply for the auxiliary heater consumes very little acid power, and a heat pipe with a simple structure that is inexpensive can be provided.

[Kaburamei no Mi@row]

Figure 1 shows the front view and 1jllllfr diagram of the Isho column.
.

The heat generated from the heating element 1 inside the sanitary is transferred to a heat sink 5 by a heat pipe 4 composed of a wick 2 and a refrigerant 3.
The heat is then radiated into space. However, since the heat radiation side is exposed to a space of absolute zero temperature, the refrigerant 3 on the heat radiation side is often solidified. Therefore, when there is no need to dissipate the heat generated inside the satellite, the heat pipe 4 is not activated by using the above condition, and when heat dissipation is necessary, the auxiliary heater 6 (heat pipe By heating the heat dissipation side of 4, the temperature of the heat dissipation side does not go below the freezing point temperature of the refrigerant 3.The input of the auxiliary heater 6 is whether or not heat dissipation is necessary, and whether the heat dissipation side is Depending on whether the temperature is below the melting point of the refrigerant 3, control is performed using a microcomputer or a bimetal heat switch.

In this way, by using conventional technology, it is easy to
A0 is configured with a heat pipe that can be controlled by II.

[Brief explanation of drawings]

FIG. 1 is a schematic @ side view of a supine heat pipe according to the present invention. 1... Heating element, 2... Quick, 3... Refrigerant, 4
... Heat pipe, 5 ... Heat sink, 6 ... Auxiliary heater O Fig. 1

Claims (1)

[Claims] (1) A heat pipe for temperature control, characterized in that when the temperature on the heating side is lower than a predetermined temperature, the refrigerant is solidified on the heat radiation side, and when the temperature on the heating side is higher than the predetermined temperature, the refrigerant is melted and activated. +2) #The heat pipe for wind speed control according to claim 1, further comprising an auxiliary heater as means for melting the solidified refrigerant.