JPH01268196A - Electronic device cooling system for jammer - Google Patents

Abstract

PURPOSE:To prove a stable operation of electronic devices in a jammer during its operating period and to improve the reliability by evaporating or sublimating refrigerating substance by the heat generated from the devices upon operation of the jammer, and cooling the electronic device bodies with the latent heat due to transfer of physical state of the refrigerant substance. CONSTITUTION:Many microcapsules 6 in which refrigerant substance to be described later is sealed around an IC body 3b of an IC 3 for a power source together with the body 3b are filled and disposed in the case 3a of the IC 3. The microcapsule 6 is formed of a polymer material to be melted and broken at about 50 deg.C or a steam transmissible membrane material, and liquid substance such as pure water, fron, etc., or sublimating solid substance such as naphthalene, iodine, dry ice, etc., is sealed as refrigerant substance 7 therein. With such a configuration, when jammer 1 generates from a flying vehicle flying in high altitude into the air and the IC 3 starts simultaneously operating as an electronic device associated with the jammer 1, the substance 7 is boiled or sublimated with the heat generation upon the operation thereby to remove heat from the body 3a by means of its latent heat due to the transfer of its physical state to cool it.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a military aircraft, a missile, or other flying object that is launched into the air during flight at a higher altitude for the purpose of disturbing radar surveillance by an enemy. The present invention relates to a method for cooling electronic equipment built into a jamming jamming wave transmitter.

[Conventional technology]

First, Figure 3 shows an overview of the above-mentioned jamming wave transmitter. In the figure, 1 is a jamming wave transmitter, 1a is a small and lightweight exterior of the transmitter 1 made of a flexible material, and inside the exterior casing a is a battery 2. A power supply IC 3 that outputs a constant voltage, a transmitter 4, etc. are built-in and sealed.

Note that 5 is interconnection wiring. A jamming radio wave transmitter having such a configuration is mounted on a flying object such as a military airplane or a missile, and is used to disturb an enemy's radar monitoring by firing it into the air when necessary during flight at high altitude. The specifications of this jamming wave transmitter include, for example, an output of 40W,
The operating time from the time of air launch is set at a minimum of 16 seconds.

(Problems to be Solved by the Invention) By the way, the electronic equipment built into the above-mentioned jamming wave transmitter, such as a power supply IC, generates a large amount of heat when energized, and its operating characteristics are highly temperature dependent. In order to obtain stable output even for short-time specifications of about several tens of seconds as described above, it is necessary to maintain the temperature of the electronic device body below a permissible value.

In this regard, conventional jamming transmitters are not equipped with any special cooling means, and the power supply IC is currently cooled by natural heat radiation.

However, with the above-mentioned natural heat dissipation method, it is difficult to sufficiently dissipate the heat generated by electronic devices such as power supply ICs, even for short-time specifications, and as a result, stable output cannot be obtained. This is a major cause of reducing the reliability of transmitters.

The present invention has been made to address the above points, and is capable of actively cooling the electronic equipment built into the aircraft during the operation period of the jamming wave transmitter to ensure the stability of its transmitting function. The purpose of this invention is to provide a cooling method that achieves this.

[Means for Solving the Problems] In order to solve the above problems, the cooling method of the present invention is a heat sink in which an electrically insulating refrigerant substance that boils or sublimates due to the heat generated by the electronic device is sealed around the main body of the electronic device. A large number of meltable or gas-permeable microcapsules are arranged, and the refrigerant substance is evaporated or sublimated by the heat generated by the electronic device due to the operation of the transmitter, and the electronic device body is cooled by the latent heat accompanying the phase transition. It is something.

[Effect]

In the above, the refrigerant substance is a liquid such as pure water or chlorofluorocarbon, or a sublimable solid such as naphthalene, iodine, or dry ice, and the content thereof is a polymeric material that easily melts and breaks at a predetermined temperature. Thin film.

Alternatively, it is encapsulated in a microcapsule made of a membrane that allows only vapor to pass through, or a thin membrane with small holes on its surface.

A large number of such microcapsules are placed around the main body of an electronic device, and when a jamming wave transmitter starts operating due to firing from a flying object, the heat generated by the electronic device causes
For example, when heat-melting microcapsules are filled with pure water as a refrigerant, the microcapsules melt and break due to the heat generation temperature of the electronic device, and the pure water sealed inside the microcapsules as a refrigerant flows around the electronic device. It starts to emit.

In addition, pure water boils at a saturation temperature corresponding to the atmospheric pressure at the emission altitude of the jammer, and its latent heat of vaporization is used to
It absorbs more heat and cools it down. As a result, stable operation of the electronic device can be guaranteed during the operating period (about several tens of seconds) of the jamming wave transmitter.

In the above case, the altitude and atmospheric pressure shown in Figure 5.

As is clear from the diagram of the relationship between the saturation temperature of pure water, the saturation temperature at an altitude of 10 km is 66°C, and by melting and destroying the microcapsules at a temperature of around 50°C, , the heat generated by the electronic device itself can melt and destroy the microcapsules and release the pure water encapsulated in the microcapsules. Note that pure water is an electrical insulator and does not pose a risk of interfering with the operation of the main body of the electronic device, and after it is used up, it scatters into the air without leaving any residue behind.

〔Example〕

1 to 3 show an embodiment of the present invention targeting the power IC 3 incorporated in the jamming wave transmitter shown in FIG. 4. Inside the case 3a-ζ- of the power IC 3 Along with the IC body 3b, a large number of microcapsules 6 filled with a refrigerant substance to be described later are arranged around the body 3b.

Here, the microcapsules 6 are made of a polymeric material that melts and breaks at a temperature of around 50°C, as shown in FIG.

Alternatively, it is made of a vapor-permeable membrane material, and inside the refrigerant substance 7, there is a liquid substance such as pure water or fluorocarbon, or naphthalene or iodine.

Contains a sublimable solid substance such as dry ice. Furthermore, FIG. 3 shows a different embodiment of the microcapsule, and the difference from the microcapsule shown in FIG. The point is that a large number of small holes 6a are opened.

The capacity of the microcapsules 6 and the refrigerant substance 7 is adjusted so as to obtain a desired cooling capacity in accordance with the calorific value and allowable temperature of the electronic device to be cooled.

The number of fillings etc. are selected.

With this configuration, the jamming wave transmitter 1 shown in FIG. 4 is emitted into the air from a flying object flying at a high altitude, and at the same time, the power supply IC as an electronic device incorporated in the transmitter 1
3 begins to operate, the refrigerant substance 7 boils or sublimates due to the heat generated by its operation, and the latent heat of the phase transition causes the IC body 3 to heat up.
Cools by removing heat from a. This prevents the temperature of the power supply IC 3 from rising excessively during the operation period of the jamming wave transmitter, allowing stable operation.

[Effects of the Invention] As described above, according to the cooling method of the present invention, the refrigerant substance is boiled or sublimated using the heat generated by the electronic device itself, without providing a special energy source for the cooling means.
The electronic device body can be cooled by the latent heat associated with the phase transition, thus ensuring stable operation of the electronic device during its operation period without impairing the function of the jammer, greatly improving reliability. can be achieved.

[Brief explanation of the drawing]

1 to 3 show embodiments of the present invention, in which FIG. 1 is a block diagram of an electronic device equipped with a cooling means, FIG.
FIG. 3 is a block diagram of different embodiments of microcapsules, FIG. 4 is a block diagram of the entire jamming wave transmitter, and FIG. 5 is a diagram showing the relationship among altitude, atmospheric pressure, and pure water saturation temperature. In each figure, 1: a jamming wave transmitter, 3: a power supply IC as an electronic device, 6: a microcapsule, and 7: a refrigerant substance. In love

Claims (1)

[Claims] 1) A cooling method that cools the electronic equipment built into a jamming wave transmitter that is emitted into the air from a flying object such as a military airplane or missile while the transmitter is in operation. A large number of heat-fusible or vapor-permeable microcapsules filled with an electrically insulating refrigerant material that boils or sublimes due to heat generation is arranged, and the refrigerant material is evaporated or sublimated by the heat generated by the electronic device accompanying the operation of the transmitter. An electronic device cooling method for a jamming wave transmitter, characterized in that the electronic device body is cooled by latent heat accompanying the phase transition.