JPH07231194A - Radiator for countermeasurement for emi - Google Patents

Abstract

PURPOSE:To reduce EMI waves and cool EMI waves-generating objects without changing a magnitude and a shape of the EMI waves-generating objects. CONSTITUTION:A solution protection tube 3 of a double-film structure filled with a liquid EMI wave-absorption solution very excellent in electric field absorption properties and magnetic field absorption properties is arranged meanderingly near a portion to which ICs of an EMI wave-generating object 1 are mounted to absorb the EMI waves and generation heat from the EMI wave-generating object 1. Thereafter, the EMI wave-absorption solution 2 filled within the solution protection tube 3 is forcibly circulated by a circulating pump 4 and heat is radiated to the outside by a radiator 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to EMI (Electro
The present invention relates to a radiator for electromagnetic interference (electromagnetic interference) countermeasures, and particularly to a radiator for EMI countermeasure processing in an IC package mounted device that requires cooling as well as EMI countermeasure processing.

[0002]

2. Description of the Related Art As a conventional technique of this type, Japanese Patent Laid-Open No.
-97278 "Electromagnetic wave shield structure" (prior art 1) and Japanese Patent Laid-Open No. 4-207098 "printing board unit cooling method" (prior art 2), and the outline of the inventions described in the respective publications. Describe.

First, the prior art 1 is an electromagnetic wave shield structure in which at least one filler of a magnetic material, a conductive material and a superconducting material is mixed in a structural material of a container for isolating a shielded object such as an electronic device. The partition has a double structure to provide a space inside the partition and to fill a liquid shield material in which a filler is mixed with a conductive material that maintains a liquid phase at a temperature near room temperature.

The prior art 2 relates to a method of cooling a printed circuit board unit on which electronic components are mounted by circulating a conductive coolant, and is a case made of a heat insulating material forming a sealed inner chamber. When,
A conductive coolant circulated in the inner chamber, a printed circuit board unit formed by covering the front and back surfaces of a board on which electronic components are mounted with an insulating coating, and a power supply pad of this printed circuit board unit are connected, With the exposed electrode bar, the printed circuit board unit is immersed in a conductive refrigerant to be housed in the inner chamber, and the conductive refrigerant supplies power to the printed circuit board unit by connecting the power supply or ground to the conductive refrigerant. And the electrode bar, and the printed circuit board unit is cooled by circulating the conductive coolant.

FIG. 7 is a partially cutaway perspective view showing a typical example of a conventional package EMI countermeasure and apparatus unit cooling method.

Referring to FIG. 7, in this conventional example, an EMI wave generation target 100 in which all IC parts are entirely insulated and an E generated by the EMI wave generation target 100 are generated.
EMI wave generation object 10 while absorbing and reducing MI wave
The liquid coolant 701 that also cools 0 and the coolant 701 is EM
In order to fill the inside and outside of the I wave generation target 100, the main body shell 700 is provided with a supply port 702 and a discharge port 703 for covering the EMI wave generation target 100 as a whole and circulating a refrigerant 701. Has been done.

[0007]

The conventional technique for suppressing the EMI wave from the EMI wave generation target and cooling the EMI wave generation target has a configuration in which all the EMI wave generation targets are immersed in a solution of a refrigerant. Since it is taken, there is a problem that the whole size is inevitably larger than the EMI wave generation target object.

Further, since the coolant of the solution that absorbs EMI waves generally uses a liquid having conductivity in order to improve the electric field absorption property and the magnetic field absorption property of the generated EMI waves, the EMI wave generation target object Had to insulate all of the IC part.

Therefore, when the IC portion of the EMI wave generation target is to be modified, the insulation processing portion of the EMI wave generation target is destroyed to correct the circuit, and then the reverse procedure is performed.
There is a problem that it is necessary to perform an inconvenient procedure in which the MI wave generation target is subjected to an insulation treatment and then immersed in the refrigerant in the outer shell of the apparatus again.

An object of the present invention is to fill a liquid EMI wave absorbing solution having a very good electric and magnetic absorption properties into an EMI wave generating object and to radiate the heat absorbed from the device. EMI through the EMI countermeasure tube with a double layer structure
An object of the present invention is to provide an EMI countermeasure radiator that absorbs EMI waves from an EMI wave generation target and cools the EMI wave absorption target by forcibly circulating the wave absorption solution.

Another object of the present invention is to provide an EMI countermeasure radiator that immediately extinguishes a flame-up portion when a fire occurs in an EMI wave generating object.

According to the present invention, an EMI countermeasure tube having a double film structure, which is filled with a liquid EMI wave absorbing solution having a good electric field absorbing property and a magnetic field absorbing property, is used as an EMI wave generating object. There is provided a radiator for EMI countermeasure treatment, which is provided with a means for piping therein to absorb and radiate heat generated by the EMI wave generating object and forcibly circulate the EMI wave absorbing solution.

Further, the EMI wave absorbing solution for absorbing EMI waves, the EMI solution agent circulation protection tube having a double membrane structure for filling and sealing the EMI wave absorbing solution to prevent its outflow, and the EMI wave absorbing solution. A radiator for circulating EMI and a radiator for radiating the EMI wave absorbing solution to the outside are obtained.

Further, there is provided an EMI countermeasure radiator which is equipped with an emergency fire-extinguishing countermeasure means for extinguishing the flame-up portion when the EMI wave generating object is attached to the solution agent circulating pump in case of fire or flame.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 shows a first radiator for EMI countermeasure processing according to the present invention.
3 is a block diagram showing the basic configuration of the embodiment of FIG.

Referring to FIG. 1, in the first embodiment, an EMI wave generation target 1 composed of a plurality of devices or packages each having an IC for generating an EMI wave, and an EMI wave generation target 1 are provided. An EMI wave absorbing solution 2 shown by an arrow for absorbing the generated EMI wave and heat, a solution protection tube 3 having a double membrane structure for preventing the EMI wave absorbing solution 2 filled and sealed inside from flowing out, and an EMI wave absorbing solution. Circulation pump 4 for circulating 2 and EMI wave absorbing solution 2
A radiator 5 for radiating heat from the outside and a fire extinguisher 6 connected to the circulation pump 4 are provided.

Here, the operation of each component will be described.

The EMI wave absorbing solution 2 filled in the solution protection tube 3 having an insulated outer jacket, which is wrapped around each device or package of the EMI wave generation object 1, passes through the solution protection tube 3 and then the EMI wave generation object. Since it comes into contact with each device or package of the object 1, its electrical insulation does not have to be taken into consideration, and the EMI from the EMI wave generation object 1 is not required.
EM generated from the EMI wave generation target 1 because it is a solution that becomes a refrigerant having excellent absorption of waves and heat and has a high fluidity.
Effectively absorbs I-waves and heat.

The solution protection tube 3 is an EMI having a double membrane structure.
Since it is a solution agent circulation protection tube and its outer cover is insulated with a non-conductive material, even if it contacts an uninsulated part of the IC in the EMI wave generation target 1 or a difficult-to-insulate part I
No short circuit of C or ground fault occurs.

The inner membrane of the solution protection tube 3 is EMI.
It is made of the same material as the outer shell body 700 (shown in FIG. 7) having conductivity to reduce waves, and absorbs EMI waves together with the EMI wave absorbing solution 2 enclosed inside.

Since the solution protection tube 3 has a double-layer structure, it prevents double leakage of the EMI wave absorbing solution 2 to the outside, and is connected to the outside in the intermediate layer between the jacket and the inner membrane. A fire extinguisher is circulated from the fire extinguisher 6 instead of the EMI wave absorbing solution 2 to cause a fire in the EMI wave generating object 1.
Emergency fire extinguishing work can be performed when a flame occurs.

The circulation pump 4 is a solution agent circulation pump for forcibly circulating the EMI wave absorbing solution 2 enclosed in the solution protection tube 3 to cool the EMI wave generating object 1.
Further, during the emergency fire extinguishing work, a fire extinguishing agent is forcedly circulated instead of the EMI wave absorbing solution 2.

As for the radiator 5, the EMI wave absorbing solution 2 is EM.
A radiator for externally radiating the heat absorbed from the I-wave generation target 1 together with the EMI waves, and changing the heat radiation capacity by changing the shape of the radiator according to the heat generation amount of the EMI-wave generation target 1. You can

Next, the operation of this embodiment will be described. The EMI waves and heat generated from the EMI wave generation target 1 are filled in the solution protection tube 3 multiply piped in the vicinity of the IC mounting location of the EMI wave generation target 1.
The I-wave absorption solution 2 is absorbed by being forcedly circulated by the circulation pump 4 and is diffused to the outside through the solution protection tube 3 and the radiator 5. Therefore, according to this embodiment, EMI waves are reduced and generated heat is dissipated.

According to the first embodiment having this structure, E
Since the solution protection tube 3 is provided inside the MI wave generation target 1, it is possible to reduce the EMI wave and radiate the generated heat without changing the outer shape and size of the EMI wave generation target 1.

Next, the structure and operation of each constituent block of the first embodiment shown in FIG. 1 will be described in detail with reference to FIGS.

FIG. 2 is a perspective view showing an example of the internal structure of the EMI wave generating object in FIG. In addition, FIG.
In the figure which shows the structure of an example of the solution protection tube in
(A) is a side view, (b) is a sectional view of the same figure (a), (c)
FIG. 3 is a partially enlarged view of FIG.

Further, FIG. 4 is a block diagram showing an example of the solution circulating system in FIG. 1, FIG. 5 is a diagram showing three examples of the radiator in FIG. 1, (a) is a front view of a large radiator, (B) is a front view of a small radiator, (c)
FIG. 3 is a perspective view of a simple radiator.

Referring to FIG. 2, the solution protection tube 3 is arranged in a meandering manner in the vicinity of the IC mounting portion of the EMI wave generating object 1, and the EMI wave absorbing solution 2 flowing in from the upper right portion is E.
The EMI wave generated in the MI wave generation target 1 and the generated heat are absorbed, and the EMI wave flows out from the lower right outlet while preventing the EMI wave from leaking to the outside from the radiator 5 (see FIG. 1). (Shown in Fig. 2) and heat is dissipated.

Next, referring to FIG. 3, the solution protection tube 3 has a double-layer structure having an intermediate layer 33 between an outer cover 31 and an inner film 32. Therefore, E flowing in the inner membrane 32
Outflow of the MI wave absorbing solution 2 to the outside of the jacket 31 is prevented.

As described above, the outer cover 31 has an electrical insulating property, and is an EM in the EMI wave generating object 1 (shown in FIG. 1).
Direct contact with the IC etc. of the suspected place that is likely to generate I wave
A flexible bellows 34 is provided for each IC width (width: about 7.62 mil) so that the MI wave generation target 1 can be stretched around.

The inner film 32 is made of a conductive material for reducing EMI waves as described above. Furthermore, the fire extinguisher 6 connected to the outside is provided in the intermediate layer 33.
The fire extinguisher (as shown in FIG. 1) is circulated instead of the EMI wave absorbing solution 2.

Next, referring to FIG. 4, the solution agent circulation system according to the present embodiment has an E inside the inner membrane 32 of the solution protection tube.
Circulation pump 4 for forcedly circulating MI wave absorbing solution 2
And a solution withdrawal tank 64 for evacuating the EMI wave absorbing solution 2 when the switching valve 63 is switched, and a fire extinguishing agent 61 (illustrated by a dashed arrow) when the switching valve 62 is switched. And an emergency fire extinguishing means constituted by the fire extinguisher 6 that is sent out to.

In this solution agent circulation system, during normal operation of the EMI wave generating object 1, the switching valve 63 is in the state shown by the solid line, so that it is radiated and cooled by the radiator 5 (shown in FIG. 1). The EMI wave absorbing solution 2 is forcedly circulated toward the EMI wave generation target 1 by the circulation pump 4.

When a fire occurs in the EMI wave generating object 1, a detection unit (not shown) detects it and switches the switching valves 63 and 62 to the states shown by the broken lines, respectively. The EMI wave absorbing solution 2 is retracted to the solution evacuation tank 64, and the fire extinguishing agent 61 from the fire extinguisher 6 is sent to the intermediate layer 33 of the solution protection tube 3. Then, the fire extinguishing agent 61 is ejected from the portion of the solution protection tube 3 which is destroyed by the fire to immediately extinguish the fired portion.

Next, in this embodiment, radiators of various shapes can be selected as the radiator 5 (shown in FIG. 1) for radiating the heat generated by the EMI wave generating object 1 according to the amount of heat generated.

Referring to FIG. 5A, this large radiator is a cooling thin tube 51 connected to the solution protection tube 3.
And a cooling fin 52 and a cooling fan 53,
The EMI wave absorbing solution 2 that has absorbed the heat generated in the I wave generation target 1 (shown in FIG. 1) is radiated by the cooling fins 52 and the cooling fan 53 when passing through the cooling thin tube 51, and the EMI waves are cooled. It is a large-capacity heat radiation type that sends the absorbing solution 2 to a circulation pump 4 (shown in FIG. 1).

Referring to FIG. 5B, this small radiator is a medium capacity heat radiation type in which the cooling thin tubes 54 and the cooling fins 55 are integrated and cooled by the air from the cooling fan 56.

Referring to FIG. 5 (c), this simple radiator is composed of a filling solution heat radiating sheet 57 connected to the solution protection tube 3, and a small heat radiating area of the filling solution heat radiating sheet 57 is naturally cooled by air. It is a capacity heat radiation type.

Next, FIG. 6 is a perspective view showing a second embodiment of the present invention, in which the basic structure shown in FIG. 1 is simplified and an existing EMI wave generation target device is provided with an EMI wave reducing measure and a cooling measure. It is an example of a simple pattern with.

Referring to FIG. 6, in the second embodiment, the solution protection tube 3 is meanderingly piped inside the outer shell of the existing EMI wave generation target device, and the existing cooling fan 59 and the heat radiation exhaust hole 5 are provided.
10 is connected to the filling solution heat dissipation sheet 58 and the solution protection tube 3, and the EMI wave absorbing solution 2 is enclosed in the solution protection tube 3 to form a natural heat circulation loop.

According to the second embodiment having this structure, it is possible to reduce EMI waves and radiate generated heat without changing the outer shape and size of the existing device.

[0042]

As described above, according to the present invention, an EMI countermeasure tube having a double film structure, which is filled with a liquid EMI wave absorbing solution having a good electric field absorbing property and a magnetic field absorbing property, is provided in an EMI wave generating object. Existing EMI by providing a means for forcibly circulating the EMI wave absorbing solution that absorbs heat generated along with the EMI wave generated by the EMI wave generating object.
EM without changing the size and external shape of the wave generation target
It is possible to take measures against I waves and cooling measures, suppress the generation of EMI waves from EMI wave generation targets, and
The effect is that the heat generated from the MI wave generation target can be radiated to the outside.

Further, there is an effect that the length of the solution protection tube and the shape of the pipe can be adjusted according to the amount of EMI waves from the EMI wave generation target and the shape and size of the EMI wave generation target. .

Further, there is an effect that the heat generation amount from the EMI wave generating object can be dealt with by changing the type of the radiator.

Furthermore, by providing an emergency fire extinguishing measure, when a fire occurs in the EMI wave generating object assembled to the solution agent circulation pump, it is possible to immediately extinguish the flame spot.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of a first embodiment of an EMI countermeasure radiator according to the present invention.

2 is a perspective view showing an example of the internal structure of the EMI wave generation object in FIG. 1. FIG.

3A and 3B are views showing the structure of an example of the solution protection tube in FIG. 1, in which FIG. 3A is a side view, FIG. 3B is a sectional view of FIG. 1A, and FIG. 3C is a portion of FIG. FIG.

FIG. 4 is a block diagram showing an example of a solution agent circulation system in FIG.

5A and 5B are views showing three examples of the radiator in FIG. 1, FIG. 5A is a front view of a large radiator, FIG. 5B is a front view of a small radiator, and FIG. 5C is a perspective view of a simple radiator.

FIG. 6 is a perspective view showing a second embodiment of the present invention.

FIG. 7 is a partially cutaway perspective view showing a typical example of a conventional package EMI countermeasure and an apparatus unit cooling method.

[Explanation of symbols]

 1,100 EMI wave generation object 2 EMI wave absorption solution 3 Solution protection tube 4 Circulation pump 5 Radiator 6 Fire extinguisher 31 Outer jacket 32 Inner membrane 33 Intermediate layer 34 Bellows 51,54 Cooling thin tube 52,55 Cooling fin 53,56 , 59 Cooling fan 57, 58 Filling solution heat radiation sheet 61 Extinguishing agent 62, 63 Switching valve 64 Solution evacuation tank 510 Heat radiation exhaust hole 700 Main body outer shell 701 Refrigerant 702 Supply port 703 Discharge port

Claims (3)

[Claims] 1. An EMI countermeasure tube having a double film structure, which is filled with a liquid EMI wave absorbing solution having a good electric field absorbing property and a magnetic field absorbing property, is provided inside an EMI wave generating object, and the EMI countermeasure tube is formed.
A radiator for treating EMI, comprising means for absorbing and radiating heat generated by a wave generation target and forcibly circulating the EMI wave absorbing solution. 2. An EMI wave absorbing solution which absorbs EMI waves, and an EMI solution agent circulation protection tube having a double membrane structure which is filled and sealed with the EMI wave absorbing solution to prevent its outflow.
The EM according to claim 1, further comprising: a solution agent circulation pump for circulating the EMI wave absorbing solution; and a radiator for radiating the EMI wave absorbing solution to the outside.
Radiator for I countermeasure processing. 3. The EMI countermeasure according to claim 1 or 2, further comprising: an emergency fire extinguishing means for extinguishing the flame spot when the EMI wave-generating target is attached to the solution agent circulating pump in case of fire or flame. Radiator for processing.