JPH11346069A - Electric equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hermetically seal up two regions easily and firmly. SOLUTION: A case is composed of a front panel 4, a rear panel 6, and side covers 10a and 10b which are made to surround a space together. The inside of the case is partitioned into two regions 12 and 14 with a middle chassis 8, and an opening 8a is provided to the middle chassis 12 to enable the regions 12 and 14 to communicate with each other. Heat releasing parts such as a high-frequency transformer 26 and a reactor 28 are provided in the region 14. A heat non-releasing part 34 is arranged in the region 12. A fan 24 which makes air circulate is provided inside the region 14. A heat sink 18 larger than the opening 8a is mounted in the region 14 confronting the opening 8a apart from it by a prescribed distance. A power semiconductor device 20 is mounted on the heat sink's surface which confronts the opening 8a and electrically connected to the heat non-releasing part 34. An elastic hermetic sealing material 16 is provided in an empty space between the heat sink 18 and the middle chassis 8 surrounding the opening 8a and coming into contact with both the heat sink 18 and the chassis 8 as it is compressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electrical equipment,
In particular, it relates to a seal structure in a case where the inside of the case is partitioned into two rooms.

[0002]

2. Description of the Related Art There are various types of electric equipment, and a power supply unit is one of them. For example, there are an arc welding machine, an arc cutting machine, a plasma arc welding machine, a plasma arc cutting machine, a charger, and a power supply device for a precious metal plating device. Conventionally, in these power supply devices, commercial AC power is converted into DC power by an AC-DC converter such as a rectifier and a smoothing circuit. This DC power is once converted to high-frequency power by the inverter. The voltage of the high-frequency power is transformed by a high-frequency transformer, and the transformed high-frequency power is converted into DC power by an AC-DC converter including a rectifier and a smoothing circuit, and supplied to a load. This circuit does not require a large transformer or a choke coil, so that the power supply device can be reduced in size and weight.

In order to further reduce the size and weight of such a power supply device, the applicant of the present invention has disclosed in FIG.
No. 349 has proposed a power supply device.

In this power supply device 2, a front panel 4 and a back panel 6 are arranged in parallel, and a substantially center of the front panel 4 and the back panel 6 in a height direction is connected by a partition wall, for example, a middle chassis 8. , H structure. Side covers 10a and 10b are provided from both left and right sides of the front panel 4 and the back panel 6 so as to cover the H structure.
As described above, a case that covers the space is formed by the front panel 4, the back panel 6, and the side covers 10a and 10b.

[0005] Two regions 12 and 14 are formed vertically in the case by the middle chassis 8. The middle chassis 8 is formed with an opening for communicating the upper and lower regions 12 and 14, for example, a rectangular opening 8 a.

In the lower region 14, a radiator, for example, a heat sink 18 is arranged so as to close the opening 8a. The heat sink 18 is in direct contact with the lower surface of the middle chassis 8 and is attached with screws or the like. On the upper surface of the heat sink 8, that is, on the surface facing the region 12, a heat-generating component such as a power semiconductor device 20 such as an IGBT constituting an inverter is attached. The heat generated by the operation of the power semiconductor device 20 is radiated to the lower region 14 via the heat sink 18 and hardly radiated to the upper region 12.

In the lower region 14, a high-frequency transformer 26 and a DC reactor 2 used in a smoothing circuit are additionally provided.
Heating components such as 8 are attached.

In the upper region 12, a printed circuit board 35 on which a control circuit for controlling the power semiconductor device 20 and a non-heat-generating component 34 such as a capacitor used in a smoothing circuit are arranged is provided with a plurality of supports 32. Attached through.

A cooling fan 24 is mounted on the lower panel 14 side of the lower area 14. Air flow holes 4a and 6a are formed in the front panel 4 and the rear panel 6 on the lower region 14 side, respectively. From the high-frequency transformer 26, the reactor 28,
The heat sink 18 is cooled.

On the front panel 4 in the upper region 12, an operation cover 36 on which operation switches, output adjusters, instruments and the like are arranged is attached. Similarly, upper region 1
The rear panel 6 has a power input fixing insulating plate 38 into which an electric wire for connecting the power supply to a commercial power supply is inserted.
Is attached.

[0011]

However, when this power supply device is used as a power supply for, for example, an arc welding machine, a cutting machine or a plasma arc welding machine, a cutting machine, etc., the environment containing dust such as iron powder. Or it may be used in an environment where corrosive gas is present. In this case, the heat sink 18
Is directly attached to the middle chassis 8 with screws or the like, so that the opening 8a of the middle chassis 8 and the heat sink 1
8, there is a minute gap, and both are not airtightly connected.

Therefore, when the fan 24 is operated,
Dust or corrosive gas may enter the upper region 12 from the gap. Therefore, it is necessary to apply silicon rubber or the like between the heat sink 18 and the middle chassis 8 to make the upper region 12 airtight. In some cases, dust and corrosive gas enter the region 12 and cause a failure or the like.

An object of the present invention is to provide an electric device which can easily and firmly hermetically seal between two regions.

[0014]

According to one aspect of the present invention, a case surrounding a space, an airtight region and a non-hermetic region formed in contact with each other in the case are provided. And an airtight material made of a closed-cell plastic or rubber-based sponge provided at a boundary portion between these regions.

According to this aspect, since the closed-cell plastic or rubber sponge is used for the airtight material,
Since it has good corrosion resistance and elasticity, it can be closely adhered to the boundary portion and can firmly maintain an airtight state.
Also, the mounting is easy.

According to another aspect of the present invention, there is provided a case surrounding a space, a partition wall which partitions the inside of the case into first and second regions, and has an opening communicating with the first and second regions. A first heat-generating component disposed in the first region, a non-heat-generating component disposed in the second region, and a fan provided in the first region for flowing air into and out of the first region. A radiator that is disposed in the first region at a distance from the opening and that is spaced apart from the opening, and that is attached to a surface of the radiator that is closer to the opening than the radiator; A second heat-generating component electrically connected to the non-heat-generating component; a space between the heat-radiating body and the partition wall surrounding the opening; and a compressed state formed by the heat-radiating body and the partition wall. And an elastic hermetic material which is in contact with the above.

In this aspect, since the elastic airtight material seals the opening of the partition wall, the second region is airtight. Therefore, even if the fan is driven, dust and corrosive gas do not enter the second area.

In this embodiment, the heat radiator is attached
In this case, the height of the elastic airtight material is set to be larger than the distance between the heat radiator and the partition in the space.

If the radiator and the elastic airtight material are attached at the same time, the elastic airtight material is compressed, and the second region can be made airtight.

Still another embodiment of the present invention provides a case surrounding a space, and a case provided through a boundary in the case.
A first region placed in the same environment as the case, a second region placed in an airtight state, a first component placed in the first region, and a second component placed in the second region And an airtight material that keeps the second region airtight at the boundary,
A conductive member that penetrates into the first and second regions while penetrating while being in close contact with the airtight material, and connects the first and second components.

According to this aspect, since the conductive member is in close contact with the airtight material, the airtight state does not collapse from the insertion portion of the conductive member.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A power supply device according to an embodiment of the present invention is different from the power supply device shown in FIG. The other part is
Since they have the same configuration, the same reference numerals are given and their detailed description is omitted.

In the power supply device shown in FIG.
Are arranged in the lower region 14 at a certain interval in the height direction from the middle chassis 8. The heat sink 18 is fixed to the middle chassis 8 by a plurality of, for example, four supports 22. The supports 22 are arranged at appropriate intervals in the width direction and the depth direction of the case.

An elastic airtight member 16 is provided in a space between the middle chassis 8 and the heat sink 18. The elastic airtight material 16 is formed in a rectangular frame shape, for example, as shown in FIG. The elastic airtight material 16 is formed to have a size slightly larger than the opening 8 a and an outer peripheral surface located inside each support 22 so as to surround the periphery of the opening 8 a of the middle chassis 8. The height of the elastic airtight material 16 is formed to be slightly larger than the height of the space between the middle chassis 8 and the heat sink 18. As the elastic airtight material 16, a material having elasticity and having no continuous air flow portion inside and outside thereof, for example, a closed-cell plastic or rubber sponge can be used.

When the elastic airtight member 16 is arranged between the supports 22 and the heat sink 18 is attached to the middle chassis 8, the height of the elastic airtight member 16 is larger than the height of the middle chassis 8 and the heat sink 18. Since it is large, the elastic hermetic member 16 is compressed, and the elastic hermetic member 16 makes the region 12 airtight with respect to the region 14.

Therefore, when the power supply device is exposed to an environment where dust and corrosive gas are present and the fan 24 is operated, the dust and corrosive gas flow into the area 14 through the flow hole 4a.
, But does not enter the region 12 through the opening 8a. Therefore, these dusts and corrosive gas do not cause a failure. Therefore, heat sink 1
Before attaching the 8 to the middle chassis 8, the operation of applying silicone rubber or the like around the opening 8a to seal the region 14 becomes unnecessary, and the manufacturing becomes easy. Further, the closed-cell plastic or rubber-based sponge does not corrode much when exposed to corrosive gas.

In the power supply device shown in FIG. 1, the support 22 is provided outside the elastic hermetic member 16, but may be provided in a space 16a inside the inner peripheral surface of the elastic hermetic member 16. Alternatively, a plurality of through holes may be formed in the wall portion 16b of the elastic airtight material 16, and the support 22 may be inserted into these through holes.

The non-heat-generating region in which the non-heat-generating components are arranged, such as the region 12, is a hermetically sealed area. Since the heat-generating region in which the heat-generating components are arranged, such as the region 14, is a region where dust and corrosive gas enter from outside the power supply, the power supply exposed to the same environment in which the power supply is installed This is the installation environment area of the device.

When it is necessary to electrically connect the components between these regions, as shown in FIG. 3, an opening, for example, a rectangular opening is formed in a boundary portion between the two regions 12, 14, for example, in the middle chassis 8. In this opening, an elastic airtight material 42 made of a closed-cell plastic or rubber sponge slightly larger than this opening is buried. A conductive member, for example, an electric wire or a bus bar 48 is inserted through the elastic airtight member 42, and a non-heat-generating component is connected to an end of the bus bar 48 on the area 12 side,
A heat-generating component may be connected to the end of the bus bar 48 on the area 14 side.

Since the elastic airtight material 42 has elasticity, it adheres tightly to the opening and maintains airtightness. Busbar 48
When such a material is inserted into the elastic airtight material 42, the elastic airtight material 42 adheres to the bus bar 48 or the like, and the airtightness is maintained.

Therefore, the area 1 in the same environment as the external environment
Even if the components in the region 12 adjacent to the region 4 and the components in the region 14 are electrically connected, the airtightness of the region 12 is maintained, so that the components in the region 12 are not connected to the external environment. Not affected.

In the above embodiment, the present invention is applied to a power supply device. However, the present invention may be applied to an electric device used in an environment with a lot of dust or an environment where corrosive gas is present. Can be. Further, in the power supply device according to the above-described embodiment, the cooling fan 24 is provided on the back panel 6 side to allow air to flow in from the inflow port 4a. However, the cooling fan 24 is provided on the front panel 4 side. You may make it inhale air from the ventilation hole 4a.

[0033]

As described above, according to the present invention, in an electric device having two adjacent regions, one of the regions is formed by using an elastic hermetic material at the boundary between one region and the other region. Airtightness can be reliably maintained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a power supply device according to an embodiment of the present invention.

FIG. 2 is a perspective view of an elastic airtight material used in the power supply device of FIG.

FIG. 3 is a perspective view showing an electrical connection between two regions of the power supply device of FIG. 1;

FIG. 4 is a longitudinal sectional view of a conventional power supply device.

[Explanation of symbols]

 Reference Signs List 4 Front panel (case) 6 Back panel (case) 8 Middle chassis (partition wall) 8a Opening 10a 10b Side cover (case) 12 Area (airtight area) 14 Area (non-airtight area) 16 Elastic airtight material 18 Heat sink (radiator) 20) Power semiconductor device (second heat-generating component) 24 Fan 26 High-frequency transformer (first heat-generating component) 28 Reactor (first heat-generating component) 34 Non-heat-generating component 42 Elastic airtight material 48 Busbar (conductive member)

Claims (4)

[Claims] 1. A case surrounding a space, a hermetic region and a non-hermetic region formed in contact with each other in the case, and a closed-cell plastic or rubber sponge provided at a boundary between these regions. An electric device including an airtight material. 2. A case surrounding a space, and the inside of the case is partitioned into first and second regions, and
A partition wall having an opening communicating with the second region, a first heat-generating component disposed in the first region, a non-heat-generating component disposed in the second region, and a first region. A fan that circulates air in and out of the first region; a radiator that is disposed in the first region so as to face the opening and is spaced apart from the opening; and a radiator that is larger than the opening; A second heat-generating component attached to the side surface and electrically connected to the non-heat-generating component in a second area; and surrounding the opening in a space between the heat-radiating body and the partition wall. And an elastic hermetic member which is in contact with the radiator and the partition wall in a compressed state. 3. The electric device according to claim 2, wherein the radiator is suspended from the partition plate, and a height dimension of the elastic airtight member is determined by a distance between the radiator and the partition plate in the space. Even large electrical equipment. 4. A case surrounding a space, a first region provided in the case through a boundary and placed in the same environment as the case, and a second region placed in an airtight state, A first component disposed in the second region, a second component disposed in the second region, a hermetic material that keeps the second region hermetic at the boundary, and penetrating while being in close contact with the hermetic material. And a conductive member that enters the first and second regions and connects the first and second components.