JP3705751B2 - Waterproof inverter - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to an inverter used outdoors, and is particularly suitable for an inverter used in a place with a lot of moisture, such as a power supply device for a concrete vibrator.
[0002]
[Prior art]
Due to the configuration of the electric circuit of the inverter, conversion loss occurs in the AC / DC and DC / AC conversion components of the main circuit, and a large amount of heat is inevitable. Therefore, in order to continuously operate the inverter, it is necessary to cool the heat generation point and prevent the temperature from becoming higher than a certain level.
The structure of the inverter for cooling the heat generation point can be roughly divided into two types, an open type and a non-open type.
[0003]
The open type has a structure shown in FIG. 3 and cools the outside air through the electric circuit 2 in the housing 1.
Although this structure has high cooling efficiency, it allows outside air to circulate through the electric circuit portion, so it sucks in anything that adversely affects the electric circuit, such as pride and water droplets, and is prone to failure.
[0004]
The non-open type has a structure shown in FIG. 4. The housing 1 is divided by an electric circuit mounting wall 3, and an electric circuit 2 is attached above the electric circuit mounting wall 3, thereby sealing the electric circuit portion. The outside air is circulated only below the electric circuit mounting wall 3 for cooling.
This structure cannot completely prevent the ingress of water droplets from the mounting portion such as a switch or cable into the sealed portion although the electric circuit portion is sealed. And once a water droplet penetrates into the sealed part, it is difficult for water to escape compared to the open type.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to completely prevent intrusion of water droplets from an attachment portion such as a switch or a cable into an electric circuit portion while ensuring cooling performance in the non-open type inverter.
[0006]
[Means for Solving the Problems]
The waterproof inverter according to the present invention divides the inside of the inverter housing up and down by an electric circuit mounting wall, mounts an electric circuit above the electric circuit mounting wall, and mounts a radiation fin and a cooling fan below the electric circuit mounting wall . In an inverter having a side wall as a part mounting wall having a part mounting part, a partitioning side wall is continuously provided on a side edge of the part mounting wall of the electric circuit mounting wall in the housing, and the upper and lower parts of the partitioning side wall and the part mounting wall An upper and lower partition wall is formed between the partition wall and the upper and lower partition walls to form a waterproof chamber that surrounds the component mounting portion, and the lower partition wall is located above the lower end of the housing, and drains water. It is configured as a hole .
It is preferable that the mounting position of the component is lower than the electric circuit (Claim 2).
[0007]
[Action]
In the present invention, when a water droplet enters the housing from a mounting portion of a part such as a switch or a cord, the water droplet only enters the waterproof chamber and does not enter the electric circuit portion isolated by the partition wall.
And since the drain hole is provided in the lower partition wall used as the bottom wall of a waterproof chamber, the water droplet which penetrate | invaded the waterproof chamber is easy to come off.
The partition wall is provided with a cord insertion hole, but since the water droplets that have entered the waterproof chamber flow downward along the wall surface of the housing, this does not pass through the code insertion hole and enter the electric circuit section. Almost unthinkable. And if the attachment position of components is made lower than an electric circuit like invention of Claim 2, a possibility that a water drop may penetrate | invade into an electric circuit part can be completely eliminated.
Since the waterproof chamber is provided only on the component mounting wall portion, the heat retaining effect due to the double wall can be suppressed as much as possible, and a predetermined cooling effect is ensured.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, the housing 1 of the inverter A is composed of a side wall that surrounds the four circumferences and an upper wall 1a. Of the side walls, two opposing walls are component mounting walls 1b, and the other two opposing walls are component mounting portions. There is no side wall 1c.
A component mounting portion 4 is opened in the component mounting wall 1b, and a switch 5, a cable 6, and an outlet 7 are mounted on the component mounting portion 4 as components.
[0009]
The housing 1 is divided into upper and lower parts by an electric circuit mounting wall 3, an electric circuit 2 is mounted above the electric circuit mounting wall 3, and heat radiation fins 8 are provided on the lower surface of the electric circuit mounting wall 3. Here, the position of the component mounting portion 4 is set lower than the electric circuit 2 so that water droplets can be effectively prevented from entering.
[0010]
A partitioning side wall 9 surrounding the component mounting part is connected to an edge of the electric circuit mounting wall 3 facing the component mounting wall 1b. A partitioning bottom wall 10 is provided at the lower part of the partitioning side wall 9 and a partitioning wall is provided at the upper part. An upper wall 11 is provided continuously. The partition wall 9, the partition bottom wall 10, and the partition upper wall 11 constitute a partition wall, and a space surrounded by these partition walls is a waterproof chamber 12. And the said partition bottom wall 10 is located above the lower end of a housing, and the drain hole 13 is provided.
Reference numeral 14 in the figure denotes a cooling fan attached below the heat radiating fins.
[0011]
In this embodiment, when a water droplet enters the housing from the component mounting portion 4, the water droplet falls into the waterproof chamber 12 and does not enter the electric circuit mounting portion. In particular, since the electrical component mounting portion 4 is positioned below the electrical circuit 2, the entry of water droplets into the electrical circuit mounting portion is reliably prevented.
[0012]
【The invention's effect】
According to the present invention, the partition wall is provided between the electrical component mounting wall and the electrical circuit to form the waterproof chamber. Therefore, even if water droplets enter the housing from the component mounting portion, the water droplets enter the waterproof chamber. It stops and does not enter the electric circuit mounting part.
And the waterproof chamber is provided corresponding to the electrical component mounting part, and the other housing side walls are not double-structured, so the heat insulation effect of the housing can be suppressed as much as possible, and the expected cooling function is ensured Can do.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention. FIG. 2 is a cross sectional view. FIG. 3 is a sectional view of an open type inverter. FIG. 4 is a sectional view of a non-open type inverter.
A Inverter 1 Housing 2 Electrical circuit 3 Electrical circuit mounting wall 4 Component mounting part 5 Switch 6 Cable 7 Outlet 8 Radiation fin 9 Partition side wall 10 Partition bottom wall 11 Partition top wall 12 Waterproof chamber 13 Drain hole 14 Cooling fan

Claims (2)

The inverter housing is divided into upper and lower parts by an electric circuit mounting wall, an electric circuit is mounted above the electric circuit mounting wall, a radiating fin and a cooling fan are mounted below the electric circuit mounting wall, and a side wall has a component mounting part. In the inverter used as the component mounting wall ,
A partitioning side wall is connected to the component mounting wall side edge of the electric circuit mounting wall in the housing, and upper and lower partitioning walls are provided between the upper and lower parts of the partitioning side wall and the component mounting wall. Forming a waterproof room that encloses the component mounting part by the partition wall,
The lower partition wall is located above the lower end of the housing and is provided with a drain hole. The waterproof inverter according to claim 1, wherein the position of the component mounting portion is lower than the electric circuit.

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