JPH01286497A - Cooling device for electronic equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a cooling method for electronic equipment, and in particular, to an electronic equipment cooling method that can reduce noise caused by cooling air exhaust while taking measures to prevent radio wave interference. Related to equipment cooling devices.

[Conventional technology]

Conventionally, the openings of electronic devices are lined with a net made of fine metal wire mesh or punched metal with many small holes in order to prevent radio interference caused by electromagnetic waves (radio waves) emitted from inside the device. things are being done. The configuration of such a cooling device for electronic equipment will be briefly explained with reference to FIG. In other words, 1 is a box that houses a board with electronic components attached or equipment with electronic components assembled, and a wall 2 of this box 1 has a wall 2 for discharging outside air taken in to cool the electronic components inside. The ventilation port 3 is opened. 4 is a protective grill installed across the vent 3; 5 is a net lined inside the vent 3 to prevent radio wave interference; 6 is a cooling air heated by electronic components inside the box 1; 7 is a mounting frame for fixing the air blower 6 inside the box body 1. According to such a cooling device.

Cooling air warmed by the electronic components by operating the blower 6 is discharged from the vent 3.

Furthermore, the net 5 lined in the vent hole 3 can prevent electromagnetic waves generated from electronic components from being radiated outside the box body 1.

Incidentally, related devices of this type include, for example, Utility Model Application Publications No. 56-101697, No. 60-187586, and No. 61-4488. In order to improve the cooling capacity of the electronic components housed in the box 1, it is necessary to increase the blowing capacity of the blower 6. When an axial fan is used as the air blower 6, the air blowing capacity is generally increased by increasing the rotational speed of the axial fan or increasing the diameter of the axial fan. However, if the air bag N6 with a large air blowing capacity is used, a large amount of noise will be emitted as well as exhaust air.

Therefore, the object of the present invention is to maximize the air blowing capacity of the air blower and to! i! An object of the present invention is to provide a cooling device for electronic equipment that generates less noise.

[Issues to be solved]

The above problem was solved by arranging the blower inside the box and away from the vent so that the cooling air that cooled the inside of the box containing electronic components was discharged through the vent opened in the wall of the box. This problem can be solved by arranging the electromagnetic interference prevention member apart from the blower and the vent in the ventilation path that connects the blower and the vent.

[Effect]

By moving the radio interference prevention material further away from the vent,
The ventilation resistance of the ventilation path connecting the ventilation device and the vent can be reduced. In addition, the cooling air discharged from the blower is rectified by the radio wave interference prevention member and discharged from the vent while recovering the static pressure. Therefore, since the ventilation resistance of the ventilation path is reduced and the air loss on the discharge side of the blower is reduced, the capacity of the blower required to maintain the same cooling effect is reduced as a result. In this case, the noise generated by the cooling device can be reduced.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In other words, 1 is a box that houses a board with electronic components attached or equipment with electronic components assembled, and the wall 2 of this box 1 is filled with outside air (if necessary) that is taken in to cool the electronic components inside. If there is, an intake port (not shown in detail) is provided). Reference numeral 4 denotes a protective grille provided across the vent hole 3. Such a slit-like or grid-like protective member is necessary from the viewpoint of preventing foreign matter from entering through the vent hole 3 or from the viewpoint of design. Like this, vent 3, protective grill 4
When the box body 1 is made of synthetic resin or the like, it is molded integrally with the wall surface 2, and in this case, the wall surface 2 is molded to prevent internal electromagnetic waves from being radiated outside the box body 1. Aluminum or other conductive material to prevent radio wave interference is placed inside by vapor deposition or other methods.

In addition, when one box 1 is constructed by bending (punching) a thin steel plate, etc., the ventilation opening 2° and the protective grille 4 can be formed integrally with these when punching the wall surface 2. . 5 is a net for preventing electromagnetic waves from being radiated from the vent 3, which is placed slightly larger than the vent 3, and such a member for preventing radio wave interference is made of a fine metal wire mesh or a thin plate. Punched metal with many small holes or other materials can be used. Reference numeral 10 denotes a support member for supporting the net 5 away from the vent 3, and this support member 10 is equipped with at least a conductive member.One end is connected to the wall surface 2 of the box body 1.
At the same time, the other end supports the net 5, and at the same time, the net 5 and the wall surface 2 of the box body 1 (the conductive portion on the inner wall side of the wall surface 2) are electrically connected. Reference numeral 6 denotes a blower device for discharging cooling air warmed by the electronic components inside the box body 1 from the vent hole 3. Although not explained in detail, the conventionally known typical blower device 6 has a cylindrical shape. Extend the support from the frame toward the center and fix the motor.

This electric motor has an outer rotor structure and is configured to drive an axial fan 9. Reference numeral 7 denotes a mounting frame for supporting the air blower 6, and is arranged so that the outlet of the air blower 6 and the net 5 are slightly exposed. 8 is the discharge port of the blower device 6 and the ventilation port 3
This is a cylindrical ventilation duct that connects the ventilation ducts 8 and 8, and the net 5 is placed approximately in the center of the ventilation path formed by the ventilation duct 8.

Now, the operation of the cooling device configured in this way, that is,
When the blower device 6 starts operating, the air inside the box body 1 is discharged into the ventilation duct 8 due to the rotation of the axial fan 9.

The cooling air immediately after being discharged from the axial fan 9 becomes a swirling flow that swirls in the rotation direction of the axial fan 9, but as it moves along the ventilation duct 8, the pressure recovers and gradually To explain further, the swirling flow from the axial fan 9 discharged into the ventilation duct 8 hits the net 5 while recovering the pressure, and by passing through the net 5, it has a rectifying effect. After the pressure is equalized in the ventilation passage, the pressure is further recovered in the process toward the ventilation port 3. That is, the cooling air discharged from the blower 6 collides with the fine holes of the net 5, eliminates the swirling component, and flows almost uniformly over the entire surface of the net 5 toward the protective grille 4. When the cooling air reaches the protective grille 4, if it is a swirling flow, the ventilation resistance will be high.
In the embodiment, the swirling component has already been removed, so the ventilation resistance is reduced.

Further, when the cooling air from the blower device 6 collides with the net 5, it is not affected by the protective grille 4 and is received over the entire surface of the net 5, so that the ventilation resistance is reduced.

In this way, in the embodiment, by reducing the ventilation resistance of the ventilation passage, the capacity of the axial fan provided as the ventilation device can be lowered.

Specifically, the diameter of the axial fan can be made smaller, or the operating (rotation) speed of the trickle fan can be lowered.

Therefore, a cooling device using a blower with reduced blowing capacity can reduce its noise.

Next, the embodiment shown in FIG. 2 will be explained. That is, in this embodiment, a support member 10 for supporting a net 5 for preventing radio wave interference is provided by molding integrally with the box body 1,
Further, the net 5 is sandwiched between the support member 10 and the ventilation duct 8.

According to such an embodiment, the position of the support member 10, the diameter of one ventilation duct 8, and the size of the outlet of the ventilation device 6 (
By appropriately selecting the diameter of the discharge flange and arranging these items in order on the weighted frame 7, a cooling device can be constructed. In addition, in this case, the support member 1
Since the numeral 0 constitutes a partition wall of the ventilation passage, the duct 1 has a cylindrical shape similar to the ventilation duct 8 .

〔Effect of the invention〕

According to the present invention, the blower device is arranged within the box body and at a distance from the vent hole so that the cooling air that cools the inside of the box housing electronic components is discharged through the vent hole opened in the wall surface of the box body. However, by arranging the blower device and the vent in the ventilation path, and the member for preventing radio wave interference separated from the blower device and the vent.

Since the ventilation resistance of the ventilation path connecting the ventilation device and the vent can be reduced, it is possible to obtain a cooling device in which the noise generated therefrom is relatively reduced.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional view for explaining the main part of one embodiment of the present invention, FIG. 2 is a partially cross-sectional view for explaining the main part of another embodiment, and FIG. FIG. 3 is a partially sectional view for explaining the structure of a conventional cooling device. 1...Box body, 2...Wall surface, 3...Vent, 4...
- Protective member, 5... Member for preventing radio wave interference, 6... Air blower, 8... Ventilation duct, 9... Axial flow fan, 10
...Supporting member. Chicken 1 > /゛7 ', ',',,'+ to ri 1 ℃
Mi ← = 100th 3rd

Claims (9)

[Claims] 1. A box body for storing electronic components, a vent hole opened in the wall of the box body, a protective member provided in the vent hole, and a cooling air that cools the electronic components inside the box body is discharged through the vent hole. an air blower disposed within the box body and away from the vent, and a radio wave disposed away from both the air blower and the vent within the ventilation passage connecting the air blower and the vent. A cooling device for electronic equipment equipped with a failure prevention member. 2. 2. The cooling device for electronic equipment according to claim 1, wherein said protection member is made of a lattice member integrally formed with a wall surface of said box. 3. 2. The cooling device for an electronic device according to claim 1, wherein the radio wave interference prevention member is made of a grid-like conductive member. 4. 4. A cooling device for an electronic device according to claim 3, wherein said member for preventing radio wave interference is made of a net made of a combination of thin metal threads or a thin metal plate with a large number of small holes. 5. 5. The cooling device for electronic equipment according to claim 4, further comprising a ventilation duct connecting the discharge port of the blower and the ventilation port. 6. Claim 5, wherein the blower device includes an axial fan.
Cooling device for the electronic equipment described. 7. 7. The electronic device according to claim 6, further comprising a support member that supports the radio interference prevention member at a distance from the vent and has one end connected to the radio interference prevention member and the other end connected to the inner wall surface of the box body. Equipment cooling system. 8. A claim in which the box body is provided with a conductive member on its inner wall surface, and the support member is provided with a conductive member that electrically connects the conductive portion of the box body and the radio interference prevention member. 7. The cooling device for electronic equipment according to 7. 9. 9. The cooling device for electronic equipment according to claim 8, wherein the support member is disposed inside the ventilation duct and has a height approximately half the length of the ventilation duct.