JPH10326975A - Control box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance heat dissipation while ensuring dust resistance by arranging board blocks between a cover and a base, disposing the covering part of a heat plate for the board block substantially in parallel with the cover and making slits in the cover and the base at such positions as the slits do not face each other. SOLUTION: Board blocks 4 are arranged longitudinally in a control box body 3 between a cover 1 and a base 2. An electronic device 5 is mounted on a board 6 in the board block 4 and coupled with a heat plate 7 through a spacer 8. A covering part 9 is disposed substantially in parallel with the cover 1 while extending from the upper end of the heat plate 7 toward the electronic device 5. Slits 10, 11 are made in the cover 1 and the base 2 at such positions as the slits do not face each other. A heat dissipation passage communicating with the outer air is formed in the control box body 3 by the slits 10, 11 so that hot air is discharged through the slit 10 thus ensuring uniform heat dissipation. The covering part 9 of the board block 4 is effective for blocking dust intruding directly through the slit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control box. More specifically, the present invention relates to a control box that enables good heat dissipation while ensuring dust resistance.

[0002]

2. Description of the Related Art Various electric appliances are provided with a control box in which a circuit section capable of controlling operation is provided. Conventionally, the control box has a closed structure without providing an opening as much as possible so as to secure dust resistance to an installation environment.

[0003]

However, recently,
The power consumption of functional products tends to increase, and the hermetically sealed structure is preventing heat generation due to power loss. In order to reduce this, a heat-generating element is attached to a heatsink to dissipate heat.However, it is best to introduce outside air into the control box and release the hot air inside the box to the outside. This is an effective measure against heat generation. However, in this case, compatibility with the dust resistance of the control box is required.

The present invention has been made in view of the above circumstances, and provides a control box which solves the drawbacks of the conventional control box and enables good heat dissipation while ensuring dust resistance. It is intended to be.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, board blocks are arranged in a row in a control box body between a lid and a base, and the board blocks are provided on the board block from the upper end of a heat sink of the board block. A cover box is provided substantially parallel to the lid toward the electronic component side, and a slit is formed in each of the lid and the base at a position not opposed to each other.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The control box of the present invention will be described below in more detail with reference to the drawings. FIG. 1 is an exploded perspective view schematically showing a control box according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view thereof. For example, as shown in FIGS. 1 and 2, in the control box of the present invention, a board block (4) is arranged in a row in a control box body (3) between a lid (1) and a base (2). ing. The electronic component (5) is mounted on the substrate (6) on the substrate block (4), and the substrate (6) and the heat radiating plate (7) are connected via a spacer (8). A cover (9) is provided substantially parallel to the lid (1) from the upper end of the heat sink (7) toward the electronic component (8). The cover (9) can be integrated with the heat radiating plate (7), and can be easily formed by bending the heat radiating plate (7). Slits (10, 11) are formed in the lid (1) and the base (2), respectively, at positions not opposed to each other.

In the control box of the present invention, the slits (10, 1) formed in the lid (1) and the base (2), respectively.
According to 1), a heat radiation path communicating with the outside air is formed in the control box body (3). For this reason, the outside air flows from the slit (11) of the base (2) to the control box body (3).
The hot air generated in the main body (3) can be discharged from the slit (10) of the lid (1) to the outside air. In addition, since the slits (10, 11) are not opposed to each other and are arranged at positions shifted from each other, there is no unevenness of heat inside the control box body (3).
Uniform heat dissipation is possible.

In the control box of the present invention, since the cover (9) is provided on the top of the substrate block (4), there is a possibility that the control box will enter through the slit (10) formed in the lid (1). The dust once hits the cover (9) and does not directly fall on the electronic component (5) of the board block (4). Moreover, the cover portion (9) surrounds the solder portion of the substrate (6) by the heat radiating plate (7) and the substrate (6), so that dust does not easily enter the solder portion. The slit (10) formed in the lid (1) is more preferably arranged immediately above the cover (9) of the substrate block (4) as illustrated in FIG. 2, and the dust control box body (3). It is effective in preventing intrusion into the inside.

Thus, the control box of the present invention
Good heat dissipation is possible while ensuring sufficient dust resistance. FIG. 3 is a plan view showing a control box according to a second embodiment of the present invention. In the embodiment shown in FIG. 3, the heating element (12) is directly attached to a heat radiating plate (7) while following the first embodiment, and the heat radiating plate (7) is used to control the control box body (3). To form a part of the outer shell. The heat generating element (12) can be attached to the heat radiating plate (7) by, for example, screwing from the back surface, and heat radiating grease can be applied.

As described above, by attaching the heat generating element (12) to the heat radiating plate (7), the heat radiating property is improved. In addition, by forming a part of the control box (3) by the heat radiating plate (7), The heat radiating plate (7) is exposed to the outside air, and the heat radiating property is further improved. In this case, if an insulating material (14) is interposed between the heat radiating plate (7) and the frame (13) of the control box body (3), measures against unnecessary radiation noise are simplified. In order to prevent unnecessary radiation noise, it is generally effective to take the primary side ground with a main body frame (13) at the ground potential. However, both the primary and secondary heating elements have the same heat sink ( When mounted in 7), the effect of the filter circuit provided in the control box tends to decrease. Insulating material (14) between the heat sink (7) and the body frame (13)
In this case, the ground insulation is ensured, the effect of the filter circuit is maintained, and both the primary and secondary heating elements can be mounted on the same heat sink (7).

The radiating plate (7) has, for example, flange portions (15) on both side ends thereof.
5) via the frame (1) of the control box body (3)
3) can be joined. For this joining, for example, an appropriate fixing tool (16) such as a bolt or a nut can be used, and the heat radiating plate (7) can be detached from the frame (13). By doing so, the substrate block (4) is unitized. Maintenance and the like are facilitated. For example, the replacement of the substrate block (4) can be performed for each unit, which is simplified.

In the case of a water fountain such as a jet tub, as shown in FIG. 4, the control box (17) is generally provided with an insulating transformer (18) for preventing electric shock, and a power supply circuit. It has been incorporated. This insulation transformer (18)
Is heavy and causes various inconveniences when the control box (17) is installed on a ceiling, a wall, or the like. In order to be able to install the control box (17), it is necessary to give strength to the ceiling and walls, but this is not only a structural problem, but also a work period adjustment for installing the control box and a contractor. There is also a problem with the construction, such as agreements between the two.

Therefore, in the control box of the present invention, the switching power supply (19) is provided on the primary side of the isolation transformer (18), and the primary input is switched at high speed by the switching power supply (19). Efficiency can be improved. The efficiency of the isolation transformer (18) is usually 50 to 60%,
9) to 80-90%. For this reason,
The size of the insulating transformer (18) can be reduced, and the weight can be reduced. As a result, the weight of the control box (17) is reduced, and, for example, the control box (18) as shown in FIG. This is because the structural design of the ceiling (20) supporting the control box (18) is also facilitated, and this is reflected on the construction surface.

Of course, the present invention is not limited by the above embodiments. It goes without saying that various aspects are possible for details such as the circuit configuration of the control box.

[0015]

As described above in detail, according to the present invention, a control box which enables good heat radiation while ensuring dust resistance is provided.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view schematically showing a control box according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the embodiment shown in FIG. 1;

FIG. 3 is a plan view showing a second embodiment of the control box according to the present invention.

FIG. 4 is a block diagram showing one embodiment of a circuit configuration of a control box.

FIG. 5 is a perspective view schematically showing installation of a control box on a ceiling of a bathroom.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Base 3 Control box main body 4 Substrate block 5 Electronic component 6 Substrate 7 Heat sink 8 Spacer 9 Covering part 10, 11 Slit 12 Heating element 13 Frame 14 Insulating material 15 Flange part 16 Fixture 17 Control box 18 Insulating transformer 19 Switching Power supply 20 ceiling

Claims (5)

[Claims] 1. A board block is arranged in a row in a control box body between a lid and a base, and a cover is provided substantially parallel to the lid from an upper end of a heat radiating plate of the board block toward an electronic component provided on the board block. And a slit formed in each of the lid and the base so as not to face each other. 2. The control box according to claim 1, wherein the cover is integral with the heat sink and is formed by bending the heat sink. 3. The control box according to claim 1, wherein a heat generating element is attached to the heat radiating plate, and the heat radiating plate forms a part of the control box main body. 4. The control box according to claim 3, wherein an insulating material is interposed between the heat sink and the main body frame. 5. The control box according to claim 3, wherein the heat radiating plate is detachably joined to the main body frame.