JP2021034461A - Electronic apparatus - Google Patents

Abstract

To provide a technology that improves heat dissipation.SOLUTION: A small fast charger 100 includes a circuit board 130 on which multiple types of electronic components are mounted, a metal case 120 that houses the circuit board 130 inside, a resin case 110 that houses the metal case 120 inside with a gap with the surface of the metal case 120, an electric fan 118 and vents 112b and 114b that force air to flow in and out between the outside atmosphere and the inside of the resin case 110. The air that is forcibly taken in and out is guided into the gap to ventilate in the longitudinal direction, and ribs 110p, 110t, 110w that causes at least either an air volume distribution or a wind speed distribution according to the tendency of a temperature distribution on the surface of the metal case 120 to occur in the ventilation cross-sectional direction in the gap.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electronic device including an electronic component.

Prior art related to a portable power supply device is conventionally known for this type of electronic device (see, for example, Patent Document 1). In this prior art, a substrate supporting an electronic circuit including an AC / DC converter is covered with a metal housing, and the substrate is further covered with a plastic housing. A large number of vents are provided through the plastic housing, and when the heat generated by the electronic circuit is transferred to the metal housing, the heat is further transferred by natural convection (or forced convection) inside the plastic housing. And released to the external environment by the flow of air.

Japanese Patent No. 3180151

Since the above-mentioned prior art releases the heat generated by the electronic circuit by a convection method, it is considered that the portable power supply device can be made smaller and lighter and the heat dissipation can be improved.

However, prior art relies on the convection of air generated throughout the plastic housing to release heat, so even if the amount of heat transferred to the metal housing varies from place to place, the entire heat can be dissipated only on average. There is a problem that it cannot suppress the partial temperature rise.

Therefore, the present invention provides a technique for improving heat dissipation.

The present invention provides an electronic device. The electronic device of the present invention has a structure in which an electronic circuit on which a plurality of types of electronic components are mounted is housed inside an inner housing, and the inner housing is further housed inside the outer housing. The outer housing accommodates the inner housing with a gap between it and the surface of the inner housing.

The electronic device of the present invention includes intake / exhaust equipment and wind guide equipment. Of these, the intake / exhaust equipment forcibly allows air to flow in and out between the outside atmosphere of the outer housing and the inside, which involves the introduction of outside air (intake) and the discharge of air from the inside (exhaust). Includes both. Such forced inflow and outflow of air can be performed using, for example, an electric fan built in the outer housing, and the intake / exhaust equipment may appropriately include an electric fan and ventilation ports (intake port and exhaust port). it can.

In this way, the intake / exhaust equipment forcibly moves air in and out inside and outside the outer housing, but by itself, sufficient heat dissipation (for example, cooling of heat-generating electronic components and inner housing) performance can be obtained. It's not a thing. The above-mentioned air guiding equipment guides the forcibly taken in and out air to the gap between the surface of the inner housing and the inner surface of the outer housing, and ventilates the air in a predetermined direction. As a result, an air flow is generated along the surface of the heat-generating inner housing, and forced air cooling is performed. However, this alone does not eliminate the bias of the temperature rise, and only uniformly cools the places where the temperature rise is high and the places where the temperature rise is low.

Therefore, the wind guide equipment not only guides the air into the gap, but also obtains an air volume distribution or wind speed distribution according to the tendency of the temperature distribution on the surface of the inner housing (uneven temperature distribution, uneven temperature rise, etc.). It is generated in the cross section in the gap (ventilation cross section = cross section orthogonal to the ventilation direction. The same applies hereinafter). That is, the ventilation in the gap occurs in a predetermined direction, but the air volume and the wind speed differ depending on the location in the cross-sectional direction. For example, if there is a part (range, region) on the surface of the inner housing where the temperature rise due to the heat generation of the electronic component is larger than the others, the air volume or the air volume is higher than the other part. The wind speed will be increased. As a result, by concentrating the cooling effect on the portion requiring more cooling, it is possible to efficiently perform cooling while eliminating the bias of the temperature distribution.

The electronic device of the present invention includes the following different aspects of the ventilation equipment.

[First aspect]
The air guide equipment has a plurality of partition members extending in a predetermined direction (that is, a ventilation direction) and partitioning the gap in a cross-sectional direction. At this time, by making the arrangement intervals of the plurality of partition members different in the cross-sectional direction, a plurality of ventilation passages having different passage widths are formed in the gap.

According to the first aspect, the air volume or the wind speed can be made different for a plurality of ventilation passages according to the width of each passage. Thereby, the passage width of the ventilation path can be changed according to the tendency of the temperature distribution on the surface of the inner housing, and the air volume or the wind speed can be controlled.

[Second aspect]
The air guide equipment has a plurality of partition members extending in a predetermined direction (that is, a ventilation direction) and partitioning the gap in a cross-sectional direction. At this time, the plurality of partition members are arranged at equal intervals in the cross-sectional direction to form a plurality of ventilation passages having a predetermined (similar) passage width in the gap. Further, the air guide equipment has an adjusting member for adjusting the inflow amount of air to each ventilation path.

According to the second aspect, although the plurality of ventilation passages have the same passage width, the inflow amount of air is adjusted by the adjusting member, so that the air volume or the wind speed increases in the ventilation passage having a relatively large inflow amount. However, the air volume or speed decreases in the ventilation passage where the inflow amount is relatively small. Thereby, the amount of air flowing into each ventilation path can be adjusted according to the tendency of the temperature distribution on the surface of the inner housing, and the air volume or the wind speed can be controlled.

According to the present invention, heat dissipation can be improved.

It is a perspective view which shows typically the small quick charger of one Embodiment. It is a horizontal sectional view (A) and a vertical sectional view (B) of a small quick charger. It is a horizontal sectional view (cross-sectional view along line III-III in FIG. 1) of a small quick charger. It is a vertical sectional view (cross-sectional view along the IV-IV line in FIG. 1) in the longitudinal direction of a small quick charger. It is a vertical sectional view (cross-sectional view along the VV line in FIG. 1) of a small quick charger in a short dimension direction. It is a horizontal sectional view (cross-sectional view along line III-III in FIG. 1) of a small quick charger. It is a vertical sectional view (cross-sectional view along the IV-IV line in FIG. 1) in the longitudinal direction of a small quick charger. It is a vertical sectional view (cross-sectional view along the VV line in FIG. 1) of a small quick charger in a short dimension direction. It is a figure which shows the structure of the small quick charger provided with the wind guide equipment of the 3rd aspect. It is a figure which shows the structure of the small quick charger provided with the wind guide equipment of 4th aspect. It is a figure which shows the structure of the small quick charger provided with the wind guide equipment of 5th aspect.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiment, the small quick charger 100 is mentioned as an example of the electronic device, but the present invention is not limited to this.

FIG. 1 is a perspective view schematically showing the small quick charger 100 of one embodiment. The small quick charger 100 generates a DC power supply by, for example, a built-in power supply circuit (AC / DC converter), and is used for other portable electric devices (for example, mobile PCs, smartphones, tablet terminals, etc.), electric assisted bicycles, and electric vehicles. It is suitable for the purpose of charging the battery of the above. An AC power source can be input to the small quick charger 100 from a power source (for example, AC100V) (not shown), and therefore a power cord (not shown) is connected to the small quick charger 100.

[Outer housing]
The small quick charger 100 includes, for example, a rectangular parallelepiped resin case 110, and the resin case 110 defines the external form of the small quick charger 100. In FIG. 1, the small quick charger 100 is shown in a flat state, and below, it is assumed that the vertical direction, the longitudinal direction, and the width direction are defined in the flat state of the small quick charger 100. However, the small quick charger 100 may be used in a small end standing state or may be used in an upright state.

The resin case 110 is composed of, for example, two parts, an upper case 112 and a lower case 114. The upper case 112 and the lower case 114 are combined with each other at the middle of the height direction of the entire resin case 110, and both are integrated to form the resin case 110.

[Inner housing]
Further, the small quick charger 100 includes a metal case 120, and the metal case 120 is housed inside the resin case 110. The metal case 120 is formed by, for example, deep drawing an aluminum material, and has a square tubular shape with one end open in the longitudinal direction. The metal case 120 is filled with, for example, a filler (sealing resin) in a state where the power supply circuit or the like is housed inside. A gap (for example, about several mm) is secured between the surface of the metal case 120 (particularly the upper and lower surfaces and both side surfaces) and the inner surface of the resin case 110.

[Intake and exhaust equipment]
The small quick charger 100 includes, for example, two electric fans 118, which have a waterproof structure. The electric fan 118 can introduce (intake) outside air from the outside (atmosphere) of the resin case 110 to the inside, or discharge (exhaust) air from the inside of the resin case 110 to the outside. Therefore, the resin case 110 is formed with rectangular openings 111 at two locations corresponding to the mounting positions of the electric fans 118. The opening 111 is located on one of the small end faces of the resin case 110 in the longitudinal direction, and the neck 116 of the external connection cord is located at the center thereof. The external connection cord is for connecting the small quick charger 100 when charging a battery of a mobile device or the like. Power is supplied to the electric fan 118 from a power supply circuit (not shown) on the circuit board 130.

Further, the upper case 112 and the lower case 114 of the resin case 110 are formed with a large number of vents 112b and 114b at the other ends in the longitudinal direction, respectively, and these vents 112b and 114b are inside and outside the resin case 110. I understand. As a result, the above-mentioned air can be taken in and out (intake and exhaust) by the electric fan 118, and when the outside air is introduced by the electric fan 118, the air in the resin case 110 is discharged from the vents 112b and 114b, and conversely, the electric fan 118 The outside air is introduced (intaken) into the resin case 110 from the vents 112b and 114b when the air is discharged. The flow of air in the resin case 110 will be described later.

FIG. 2 is a horizontal sectional view ((A) in FIG. 2) and a vertical sectional view ((B) in FIG. 2) of the small quick charger 100. The vertical cross section is a cross section along the longitudinal direction.

[Circuit board]
A circuit board 130 (power supply board) is housed inside the metal case 120. Various electronic and electrical components such as power semiconductors, transformers, and inductors (not shown) are mounted on the circuit board 130, and electronic components such as capacitors, resistors, and IC chips are mounted on the circuit board 130 to form AC / DC. A power supply circuit having a converter is formed. Then, in a state where the circuit board 130 is housed inside the metal case 120, the inside of the metal case 120 is entirely filled (resin-sealed) with the filler 160. The filler 160 protects the circuit board 130 by making the inside of the metal case 120 watertight and airtight, and also functions as a medium for transferring the heat generated in the circuit board 130 to the metal case 120. The metal case 120 functions not only as an electromagnetic shield and ground (GND) of the circuit board 130 (power supply circuit), but also as a heat sink.

Here, since the above-mentioned electronic components such as power semiconductors, transformers, and inductors are heat-generating components 140 and 150 in which heat generation (temperature) during operation is higher than that of other components, these heat generations are generated on the circuit board 130. In the places where the components 140 and 150 are mounted, the temperature rise (rise width) of the surface of the metal case 120 is larger than that in other places.

[Temperature distribution tendency (bias)]
In FIG. 2 (A): For example, on the surface of the metal case 120 (upper surface and lower surface in a plan view), heat is generated near the center in the longitudinal direction and gradually separated from the central portion in the short dimension direction to both sides. Parts 140 and 150 are located. Therefore, the heat from these heat generating parts 140 and 150 is transferred, and the surface of the metal case 120 (upper surface and lower surface in a plan view) has a higher temperature than other parts in the upper and lower parts of the heat generating parts 140 and 150. The rise will be large.

FIG. 2 (B): Further, the circuit board 130 is housed at a position separated from the lower surface of the metal case 120 to some extent, and the heat generating components 140 and 150 have a mounting height that is close to the upper surface of the metal case 120 to some extent. Therefore, at the positions corresponding to the heat generating parts 140 and 150, the temperature rise is higher on the upper surface than on the lower surface of the metal case 120. Similarly, on the surface (side surface) of the metal case 120, the temperature rise of the portion corresponding to the heat generating parts 140 and 150 in the height direction becomes larger than that of the other portions.

In this way, even if the circuit board 130 forming the power supply circuit is housed inside the metal case 120, the temperature rise of the metal case 120 due to the heat generated by the electronic components is not uniform as a whole, and the temperature on the surface is not uniform. It can be seen that the distribution tends to be non-uniform (biased). Therefore, even if the electric fan 118 is operated to simply introduce the outside air or exhaust the air to the outside, the forced air is forced to flow in and out between the surface of the metal case 120 and the inner surface of the resin case 110 (inside the gap). ), The temperature distribution on the surface of the metal case 120 is not eliminated at all, and the temperature remains difficult to decrease in places where the temperature rise is high.

[Wind guide equipment]
Therefore, in the present embodiment, the small quick charger 100 is provided with a wind guide device. The wind guide equipment controls to increase the air volume or speed (either one or both) of the flowing air at the place where the temperature rise becomes high according to the tendency of the temperature distribution on the surface of the metal case 120. , The small quick charger 100 is efficiently cooled while eliminating the temperature distribution. The air volume and speed can be controlled by the air guide equipment, for example, by the following plurality of modes.

[First aspect]
3 to 5 are cross-sectional views showing the configuration of the air guide equipment of the first aspect. Of these, FIG. 3 is a horizontal cross-sectional view of the small quick charger 100 (cross-sectional view taken along line III-III in FIG. 1), and FIG. 4 is a vertical cross-sectional view in the longitudinal direction (line IV-IV in FIG. 1). FIG. 5 is a vertical cross-sectional view in the short dimension direction (cross-sectional view taken along the line VV in FIG. 1).

[Partition member]
As shown in FIGS. 3 to 5, a plurality of ribs (reference numerals will be described later) are formed inside the resin case 110, and all of these ribs are in the longitudinal direction of the resin case 110 and the metal case 120. Extends to. The air entering and exiting the resin case 110 is guided by the ribs and ventilates in the longitudinal direction in the gap between the surface of the metal case 120 and the inner surface of the resin case 110. Then, the wind guide equipment generates an air volume distribution or a wind speed distribution (either one or both) in the cross-sectional direction of the gap according to the tendency of the temperature distribution on the surface of the metal case 120. Hereinafter, a specific description will be given.

[Ribs 110a, 110b, notch 110c]
As shown in FIG. 3, for example, in a plan view of the small quick charger 100, ribs 110a and 110b form a continuous row in the longitudinal direction near one end in the short dimension direction inside the resin case 110. Is formed. One of the ribs 110a has a linear shape, but one end of the other rib 110b is bent and connected to the inner surface of the resin case 110. Further, a notch 110c is provided between the two ribs 110a and 110b forming a row. The length of the notch 110c is sufficiently short with respect to the total length of the continuous row of ribs 110a and 110b (for example, about 1/10 to 1/30; the same applies hereinafter). All ribs (reference numerals are shown later as appropriate) including the ribs 110a and 110b are integrally formed inside the resin case 110.

[Ribs 110d, 110e, notch 110g]
Similarly, in a plan view of the small quick charger 100, two ribs 110d and 110e are formed in a row in the longitudinal direction with a space between the rows of the ribs 110a and 110b in the short dimension direction. One of the ribs 110d has a length comparable to the length dimension of the metal case 120 in the longitudinal direction, while the other rib 110e is made of resin from the inside of one small end surface of the resin case 110 in the longitudinal direction. It is only as long as one end of the case 110. However, the other rib 110e is connected to one small end surface of the resin case 110 to partition between the electric fan 118 and the upper surface of the metal case 120. A notch 110g is also provided between the two ribs 110d and 110e forming a row. The length of the notch 110g is also sufficiently short with respect to the total length of the continuous row of ribs 110d, 110e.

[Ventilation path 110f]
Here, focusing on the space between the ribs 110a and 110b forming two rows in the longitudinal direction and the ribs 110d and 110e, there is ventilation in the gap between the upper surface of the metal case 120 and the inner surface of the resin case 110. It can be seen that the road 110f is formed. The ventilation passage 110f extends directly above the heat generating component 140 in a plan view, and one end of the ventilation passage 110f is directly connected to the electric fan 118. Therefore, as shown by a thick arrow in FIG. 3, the ventilation passage 110f has a structure in which air entering and exiting by the electric fan 118 satisfactorily flows through the heat generating region on the upper surface of the metal case 120. By switching the rotation direction of the electric fan 118, the ventilation can be switched to either of the two directions (the same applies hereinafter).

Although not marked in FIG. 3, a ventilation path is also formed on the opposite side (between the inner surface of the resin case 110) in the short dimension direction with the ribs 110a and 110b interposed therebetween. As shown by a thin arrow in FIG. 3, this ventilation path can be ventilated through the notch 110c described above. However, the air volume and the wind speed here are set smaller than those of the ventilation path 110f (small air volume, low wind speed).

[Rib 110h, 110k, Notch 110n]
Further, in a plan view of the small quick charger 100, two ribs 110h and 110k are formed in a row in the longitudinal direction with a space between the rows of the ribs 110d and 110e in the short dimension direction. These ribs 110h and 110k have a length of about half of the length of the metal case 120 in the longitudinal direction. Of these, one rib 110h is linear, while the other rib 110k is bent from a position on the surface of the metal case 120 to one small end surface of the resin case 110. Further, one end of the rib 110h is connected to one small end surface of the resin case 110 to partition the neck 116 and the electric fan 118. Further, a notch 110n is also provided between the two ribs 110h and 110k forming a row. The length of the notch 110n is also sufficiently short with respect to the total length of the continuous row of ribs 110h and 110k.

[Ventilation path 110m]
A ventilation path 110m is formed in the above-mentioned gap between the ribs 110d and 110e forming two rows in the longitudinal direction and the ribs 110h and 110k. The ventilation path 110 m extends in the longitudinal direction on the surface of the metal case 120 in a plan view, but does not particularly pass through the positions directly above the heat generating parts 140 and 150. The ventilation in the ventilation path 110 m will be described later.

[Rib 110p, 110q, Notch 110s]
Further, in a plan view of the small quick charger 100, ribs 110p and 110q are formed inside the resin case 110 in the vicinity of the other end in the short dimension direction in a continuous row in the longitudinal direction. The shapes and arrangements of the ribs 110p and 110q are close to a symmetrical relationship with the ribs 110a and 110b. Further, a notch 110s is provided between the two ribs 110p and 110q forming a row.

[Ventilation path 110j]
Then, it can be seen that the ventilation passage 110j is formed in the above-mentioned gap between the ribs 110h and 110k forming two rows in the longitudinal direction and the ribs 110p and 110q. The ventilation passage 110j extends directly above the heat generating component 150 in a plan view, and one end of the ventilation passage 110j is directly connected to the electric fan 118. Therefore, as shown by a thick arrow in FIG. 3, the ventilation passage 110j has a structure in which air entering and exiting by the electric fan 118 satisfactorily flows through the heat generating region on the upper surface of the metal case 120.

Further, a ventilation passage 110r is also formed on the opposite side (between the inner surface of the resin case 110) in the short dimension direction with the ribs 110p and 110q interposed therebetween. As shown by a thin arrow in FIG. 3, the ventilation passage 110r can be ventilated through the notch 110s. However, the air volume and the wind speed here are set smaller than those of the ventilation path 110j (small air volume, low wind speed).

Further, as shown by a thin arrow in FIG. 3, the above-mentioned ventilation passage 110m can be ventilated from the ventilation passages 110f and 110j adjacent to both sides in the short dimension direction through the notches 110g and 110n.

[Air volume distribution / Wind speed distribution]
The arrow lines shown in FIG. 3 indicate that the thick arrow line ^{circulates air at a larger air volume (for example, m 3} / min) and higher wind speed (for example, m / sec) than the thin arrow line. In the present embodiment, air forced in and out between the inside and the outside of the resin case 110 by two electric fans 118 is introduced into the gap between the upper surface of the metal case 120 and the inner surface of the resin case 110 by a large number of ribs. Although the air is guided and ventilated in the longitudinal direction, the air volume and the wind speed are distributed in the ventilation cross-sectional direction (the air volume and the air velocity are biased according to the tendency of the temperature distribution).

[Aisle width / Ventilation cross-sectional area]
That is, for the ventilation passages 110f and 110j having a larger passage width in the cross-sectional direction and therefore a relatively large ventilation cross-sectional area due to the shape and arrangement of the ribs, the air volume and speed there are set to other ventilation passages (110m, 110r, etc.). ) Can be larger (large air volume, high wind speed). As a result, the cooling efficiency at the position directly above the heat generating parts 140 and 150 can be improved, and the temperature rise can be suppressed. Regarding the ventilation passage 110m located at the center in the short dimension direction, the passage width (ventilation cross-sectional area) may be appropriately reduced by adding ribs between the ribs 110d and 110e and the ribs 110h and 110k. .. Further, although FIG. 3 shows the air flow mode on the upper surface of the metal case 120, the lower surface can be considered in the same manner (symmetrically).

FIG. 4 is a diagram showing a structure between one side surface of the metal case 120 and the inner surface of the resin case 110. Also on one side surface of the metal case 120, the air forced in and out by the electric fan 118 passes through the gap between the metal case 110 and the inner surface of the resin case 110. At this time, similar to the structure on the upper surface shown in FIG. 3, a rib structure that increases the air volume and the wind speed in the region where the temperature rise by the heat generating component 150 (140) is relatively high can be formed.

[Rib 110t, 110u, notch 110v]
For example, in the side view of the small quick charger 100, two ribs 110t and 110u are formed in a row in the longitudinal direction at the upper position. Both the ribs 110t and 110u are linear, the other rib 110u is longer than the one rib 110t, and the other rib 110u is connected to the inside of the small end surface of the resin case 110. Further, a notch 110v is provided between the two ribs 110t and 110u forming a row. The length of the notch 110v is also sufficiently short with respect to the total length of the continuous row of ribs 110t and 110u.

[Rib 110w, 110y, notch 110z]
Further, in the side view of the small quick charger 100, two ribs 110w and 110y are also formed in a row in the longitudinal direction at the lower position. One rib 110w is linear, while the other rib 110y is bent and connected to the inside of the small end surface of the resin case 110. Further, a notch 110z is provided between the two ribs 110w and 110y forming a row. The length of the notch 110z is also sufficiently short with respect to the total length of the continuous row of ribs 110w and 110y.

[Ventilation path 110x]
Then, it can be seen that the ventilation passage 110x is formed in the above-mentioned gap between the ribs 110t and 110u forming two rows in the longitudinal direction and the ribs 110w and 110y. The ventilation passage 110x extends through the side of the heat generating component 150 in a side view, and one end of the ventilation passage 110x is directly connected to the electric fan 118. Therefore, as shown by a thick arrow in FIG. 4, the ventilation passage 110x has a structure in which air entering and exiting by the electric fan 118 satisfactorily flows through the heat generating region on the side surface of the metal case 120. The same can be considered for the opposite side surface.

Although not marked in FIG. 4, different ventilation passages are formed above and below the ventilation passage 110x, and each of these ventilation passages is shown by a thin arrow line in FIG. Ventilation is possible through the notches 110v and 110z. If the distance from the heat generating component 150 to the side surface of the metal case 120 is sufficiently longer than that of the upper and lower surfaces and there is no extreme bias in the temperature rise on the side surface, the arrangement of the ribs may be appropriately changed or omitted. May be good.

FIG. 5 is a diagram showing the inlet shape of the ventilation passage in the gap between the surface of the metal case 120 and the inner surface of the resin case 110. As described above, the inlets of the ventilation passages 110f and 110j corresponding to the positions where the temperature rise due to the heat generating parts 140 and 150 are relatively high on the upper and lower surfaces of the metal case 120 are directly connected to the electric fan 118. As a result, more air can be guided to the air passages 110f and 110j, and the air volume and speed can be increased. Although the passage cross-sectional area of the ventilation passage 110m at the center position is relatively large, the air volume and speed are not large as compared with the ventilation passages 110f and 110j because they are not directly connected to the electric fan 118.

[Second aspect]
Next, the second aspect of the wind guide equipment will be described.
6 to 8 are cross-sectional views showing the configuration of the air guide equipment of the second aspect. Of these, FIG. 6 is a horizontal cross-sectional view of the small quick charger 100 (cross-sectional view taken along line III-III in FIG. 1), and FIG. 7 is a vertical cross-sectional view in the longitudinal direction (line IV-IV in FIG. 1). FIG. 8 is a vertical cross-sectional view in the short dimension direction (cross-sectional view taken along the line VV in FIG. 1). The electronic device provided with the air guiding equipment of the second aspect is referred to as a small quick charger 200. The same reference numerals are given to the configurations common to the other first aspects.

[Partition member]
As shown in FIGS. 6 to 8, a plurality of ribs 110α are formed inside the resin case 110, and all of these ribs 110α extend in the longitudinal direction of the resin case 110 and the metal case 120. .. The air entering and exiting the resin case 110 is guided by the rib 110α and ventilates in the longitudinal direction in the gap between the surface of the metal case 120 and the inner surface of the resin case 110. Then, the wind guiding equipment of the second aspect generates an air volume distribution or a wind speed distribution (either one or both) according to the tendency of the temperature distribution on the surface of the metal case 120 in the cross-sectional direction of the gap. Hereinafter, a specific description will be given.

In the second aspect, a plurality of ribs 110α are formed in the longitudinal direction in the plan view of the small quick charger 200, and these ribs 110α are arranged at substantially equal intervals in the short dimension direction. Each rib 110α is linear, and the length is substantially unified to a degree slightly shorter than the longitudinal dimension of the metal case 120. Therefore, in the gap between the surface of the metal case 120 and the inner surface of the resin case 110, a plurality of ventilation passages 110β having substantially the same passage width in the plan view (FIG. 6) and the side view (FIG. 7) are formed. Has been done. The same applies to the ventilation cross-sectional area of the ventilation passage 110β.

[Adjusting member]
On the other hand, in the second aspect, the structure is such that the inflow amount of air into each ventilation path 110β is adjusted. Specifically, by arranging the adjusting member 110γ at one end of a part of the ventilation passages 110β, the size (area) of the opening of the ventilation passage β in which the adjusting member 110γ is arranged is narrower than the others. The adjusting member 110γ is not arranged for all the ventilation passages 110β, and passes through the region (heat generation region by the heat generating parts 140 and 150) where the temperature rise on the surface of the metal case 120 tends to be relatively high. Is not provided.

[Air volume distribution / Wind speed distribution]
The arrow lines shown in FIG. 6 indicate that the thick arrow line ^{circulates air at a larger air volume (for example, m 3} / min) and higher wind speed (for example, m / sec) than the thin arrow line. Also in the second aspect, the gap between the upper surface of the metal case 120 and the inner surface of the resin case 110 by a large number of ribs 110α for the air forced in and out between the inside and the outside of the resin case 110 by the two electric fans 118. Although it is guided inward and ventilated in the longitudinal direction, the air volume and the wind speed are distributed in the ventilation cross-sectional direction (the air volume and the air velocity are biased according to the tendency of the temperature distribution).

[Adjustment of inflow]
That is, by arranging the adjusting member 110γ with respect to some of the ventilation passages 110β, the opening area is made smaller than that of the other ventilation passages 110β, and for the other ventilation passages 110β in which the adjusting member 110γ is not arranged, the air there. The inflow amount is adjusted to be larger than that of the other ventilation passage 110β, which has a small opening area. Alternatively, for the ventilation passage 110β having a relatively large opening area by providing a difference in the opening area even if the adjusting member 110γ is arranged, the inflow amount of air there is larger than that of the other ventilation passage 110β having a small opening area. adjust. As a result, the air volume and speed in the ventilation passage 110β having a relatively large opening area are made larger than those in the ventilation passage 110β having a small opening area (large air volume, high wind speed), and the cooling efficiency at the position directly above the heat generating parts 140 and 150 is improved. It has a structure that can raise the temperature and suppress the temperature rise. Further, although FIG. 6 shows the air flow mode on the upper surface of the metal case 120, the lower surface can be considered in the same manner (symmetrically).

FIG. 7 is a diagram showing a structure between one side surface of the metal case 120 and the inner surface of the resin case 110. Also on one side surface of the metal case 120, the air forced in and out by the electric fan 118 passes through the gap between the metal case 110 and the inner surface of the resin case 110. At this time, similar to the structure on the upper surface shown in FIG. 6, a rib structure that increases the air volume and the wind speed in the region where the temperature rise by the heat generating component 150 (140) is relatively high can be formed.

For example, in the side view of the small quick charger 200, a plurality of ribs 110α are formed so as to extend in the longitudinal direction, and these ribs 110α are arranged at substantially equal intervals in the height direction. The opening area is narrowed by arranging the adjusting member 110γ at one end of a part of the ventilation passages 110β. In the example of FIG. 7, the opening area of the ventilation passage 110β extending to the side of the circuit board 130 is made larger than the others, so that the air volume and the wind speed here are made larger than the others. As a result, when it is considered that the heat from the heat generating components 140 and 150 is transferred from the circuit board 130 to the side surface of the metal case 120 and the temperature rise is biased, such a temperature rise can be efficiently suppressed. it can. In the first aspect, the rib may be formed in the same way. The same can be considered for the opposite side surface.

[Opening area]
FIG. 8 shows how the size of the opening differs for each ventilation path 110β. As for the upper surface of the metal case 120, the opening area of the ventilation passage 110β passing directly above the heat generating parts 140 and 150 is set to be larger than the others as described above. Further, on one side surface (the left side surface as seen in FIG. 8), the opening area of the ventilation passage 110β passing through the side of the circuit board 130 is set to be larger than the other side surface. Although the bottom surface and the other side surface (the right surface in FIG. 8) are not symmetrical, in order to set the opening area of each ventilation path 110β according to the actual bias (temperature distribution) of the temperature rise, the adjusting member 110γ is appropriately used. It shall be arranged.

As described above, the following advantages can be obtained according to the present embodiment.
A circuit board 130 (power supply board) on which electronic components including heat generating components 140 and 150 such as power semiconductors, transformers, and inductors are mounted is housed in the metal case 120, but a filler and a filler are housed in the metal case 120. Heat from the electronic components is transferred by the heat radiating sheet, and a bias (temperature distribution) in temperature rise occurs on the surface of the metal case 120. In both the first aspect and the second aspect, while forcibly moving in and out of air by the electric fan 118, the air is guided to the gap between the surface of the metal case 120 and the inner surface of the resin case 110, and in particular, metal. By controlling the air volume or the air velocity at the place where the temperature rise tends to be high on the surface of the case 120 to be larger than the others, cooling can be performed in the direction of eliminating the temperature distribution.

In the air guide equipment of the first aspect, the shape and arrangement of the ribs are planned in advance according to the arrangement of the heat generating parts 140 and 150 on the circuit board 130, thereby reliably cooling the small quick charger 100. The operating performance can be guaranteed.

In the ventilation equipment of the second aspect, the ribs 110α are arranged at equal intervals and have the same shape, but the arrangement of the adjusting members 110γ is appropriately planned according to the arrangement of the heat generating parts 140 and 150 on the circuit board 130. , The small quick charger 200 can be reliably cooled and its operating performance can be guaranteed.

If the air guiding equipment of the present embodiment is not provided, the air flow in the gap is averaged as a whole, so that the temperature rising by the heat generating parts 140 and 150 is reduced to a desired level. Therefore, the overall operating speed (blower performance) of the electric fan 118 must be set to a high level, which causes a problem that the equipment becomes large and the power consumption increases. In this respect, in the present embodiment, the air volume and the wind speed are lowered in the place where the temperature rise is relatively low, and the ventilation is concentrated in the place where the temperature rise is relatively high to increase the air volume and the wind speed. It is advantageous in that the performance of the fan 118 can be efficiently utilized to exhibit the desired cooling performance.

[Third aspect]
FIG. 9 is a diagram showing the structure of the small quick charger 300 provided with the air guiding equipment of the third aspect.
The wind guide equipment of the third aspect has a structure in which the above-mentioned first aspect and the second aspect are combined. That is, in a plan view, one half of the metal case 120 in the short dimension direction (lower half of FIG. 9) has the structure of the first aspect, and the other half has the structure of the second aspect. Even in the air guiding equipment of the third aspect, it is possible to surely eliminate the bias of the temperature rise due to the heat generating parts 140 and 150 and perform the cooling.

[Fourth aspect]
FIG. 10 is a diagram showing the structure of a small quick charger 400 provided with the air guiding equipment of the fourth aspect.
The ventilation equipment of the fourth aspect has a structure in which the arrangement of the electric fan 118 and the vent 112b is partially different in the first aspect described above. That is, in a plan view, one half of the metal case 120 in the short dimension direction (upper half of FIG. 10) has the same structure as that of the first aspect, and the other half has a structure inverted in the longitudinal direction. Even in the air guiding equipment of the fourth aspect, it is possible to surely eliminate the bias of the temperature rise due to the heat generating parts 140 and 150 and perform cooling.

[Fifth aspect]
FIG. 11 is a diagram showing the structure of a small quick charger 500 provided with the ventilation equipment of the fifth aspect.
The ventilation equipment of the fifth aspect has a structure in which the arrangement of the electric fan 118 and the vent 112b is partially different in the second aspect described above. That is, in a plan view, one half of the metal case 120 in the short dimension direction (upper half of FIG. 11) has the same structure as that of the second aspect, and the other half has a structure inverted in the longitudinal direction. Although not shown, a partition plate may be provided between each electric fan 118 and the adjacent vent 112b. Even in the air guiding equipment of the fifth aspect as described above, it is possible to reliably eliminate the bias of the temperature rise due to the heat generating parts 140 and 150 and perform cooling.

The present invention can be implemented in various modifications without being limited to one embodiment including the first to fifth aspects described above.

For example, the size and shape of the metal case 120 and the resin case 110 are not limited to those shown in the figure, and may be various three-dimensional shapes.
Further, the arrangement and number of the electric fans 118 are arbitrary, and any arrangement and number may be used as long as good air inflow and outflow can be generated between the inside and the outside of the resin case 110. Further, the electric fan 118 is not limited to the propeller type fan, and may be a sirocco type fan.

In the wind guide equipment of the first aspect, one notch is provided between the ribs in each row, but a plurality of notches may or may not be provided at all.
Further, the arrangement of the heat generating parts 140 and 150 shown in the figure is an example, and there may be three or more heat generating parts or only one. In any case, the shape and arrangement of the ribs can be determined according to the arrangement of such heat generating parts, the temperature distribution generated on the surface of the metal case 120 can be eliminated, and the cooling efficiency can be improved.

The arrangement interval and the number of ribs 110α mentioned in the ventilation equipment of the second aspect are arbitrary, and may be increased or decreased as appropriate. Further, at the positions directly above the heat generating parts 140 and 150, the arrangement interval of the ribs 110α may be made larger than the others, and the passage width may be made larger than the others like the ventilation passages 110f and 110j of the first aspect.

In addition, the structures shown in the drawings in the embodiments and the like are merely preferable examples, and it is said that the present invention can be preferably carried out even if various elements are added to the basic structure or a part thereof is replaced. Not to mention.

100, 200, 300, 400, 500 Small quick charger 110 Resin case 110a, 110α Rib 110f, 110β Ventilation path 110c Notch 110γ Adjusting member 112b, 114b Vent 118 Electric fan 120 Metal case 130 Circuit board

Claims (8)

A circuit board on which multiple types of electronic components are mounted,
An inner housing that houses the circuit board inside,
An outer housing that houses the inner housing inside with a gap between it and the surface of the inner housing,
An intake / exhaust facility that forcibly allows air to flow in and out between the outside atmosphere of the outer housing and the inside.
The air coming in and out of the intake / exhaust equipment is guided into the gap to be ventilated in a predetermined direction, and at least one of the air volume distribution and the wind speed distribution according to the tendency of the temperature distribution on the surface of the inner housing is made in the gap. An electronic device equipped with a ventilation facility that is generated in the direction of the ventilation cross section. In the electronic device according to claim 1,
The wind guide equipment is
A plurality of ventilation passages having different passage widths are formed in the gap by extending in the predetermined direction to partition the gap in the ventilation cross-sectional direction and having different arrangement intervals in the ventilation cross-sectional direction. An electronic device characterized by including a partition member of the above. In the electronic device according to claim 2.
The plurality of partition members
An electronic device characterized in that the arrangement interval of a portion showing a tendency for the surface temperature of the inner housing to be relatively high is set wider than the arrangement interval of other portions. In the electronic device according to claim 2 or 3.
The plurality of partition members
It is characterized in that the flow of air coming in and out of the intake / exhaust facility is guided with priority over other ventilation passages with respect to the ventilation passage corresponding to the portion where the surface temperature of the inner housing tends to be relatively high. Electronics. In the electronic device according to any one of claims 2 to 4.
The partition member is
An electronic device characterized in that a part of a section extending in a predetermined direction is cut out to allow ventilation between adjacent ventilation passages. In the electronic device according to claim 1,
The wind guide equipment is
A plurality of ventilation passages having a predetermined passage width in the gap by extending in the predetermined direction to partition the gap in the ventilation cross-sectional direction and arranging the gap at equal intervals in the ventilation cross-sectional direction. With multiple partition members forming
An electronic device including an adjusting member for adjusting the amount of air flowing in and out of the intake / exhaust facility into each of the ventilation passages. In the electronic device according to claim 6,
The adjusting member
The feature is that the inflow amount into the ventilation passage corresponding to the portion where the surface temperature of the inner housing tends to be relatively high is adjusted to be larger than the inflow amount into the ventilation passage corresponding to other portions. Electronic equipment to do. In the electronic device according to any one of claims 2 to 7.
The plurality of partition members
An electronic device characterized in that it is composed of ribs formed so as to project from the inner surface of the outer housing toward the surface of the inner housing.