JP2013197152A - Housing for electrical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably prevent dust or dirt from being attached to an electrical circuit in a housing.SOLUTION: An electrical circuit is housed inside a trunk part 2 having a front panel 4 and a rear panel 6 mounted on openings of end parts. In the trunk part 2, tip end parts of an internal cover 14 are located in the vicinity of joints 8 and 10 between the front and rear panels 4 and 6 in the trunk part 2, and a remaining portion is located inside the trunk part 2 and covered with the electrical circuit from the ceiling surface side and both side surface sides of the trunk part 2. In the vicinity of the joints 8 and 10, external covers 54 and 56 are located over the joints 8 and 10 while the tip end parts of the internal cover are inserted into the inside of the external covers.

Description

  The present invention relates to a housing for an electric device, and more particularly to a case in which a dustproof measure is taken.

  2. Description of the Related Art Conventionally, examples of electrical equipment casings that have been dust-proofed include those disclosed in Patent Document 1. In the technique of Patent Document 1, a front panel and a back panel are arranged so as to face each other with a space therebetween, and an intermediate part is arranged so as to connect between them. An inner cover having a substantially inverted U-shaped front shape and rear shape is disposed so as to cover the power supply circuit components in the intermediate portion. A tongue piece is formed from the entire area on the front panel side of the upper part of the inner cover so as to face obliquely upward beyond the contact surface between the front panel and the intermediate part. Similarly, another tongue piece is formed from the entire area on the back panel side of the upper part of the inner cover to face obliquely upward beyond the contact surface between the back panel and the intermediate part.

JP 2008-118854 A

  According to the technique of Patent Document 1, even if water droplets such as rainwater enter the inside of the housing from the contact surface between the front panel and the intermediate portion or the contact surface between the rear panel and the intermediate portion, the tongue piece is transmitted. Therefore, the power circuit components in the inner cover can be prevented from touching the water droplets. However, dust or dirt that has entered the inside of the housing from the contact surface between the front panel and the middle part or from the contact surface between the rear panel and the middle part can be removed from the front panel side of the inner cover or from the front panel side of the rear panel. There was a case of intruding inside the cover.

  An object of this invention is to provide the housing | casing for electrical devices which prevented the penetration | invasion of such dust and dust.

  The housing for an electric device of one embodiment of the present invention has a body portion. The body part is a part in which a panel is attached to the opening of the body part having a hollow inside and at least one of the front surface and the back surface being opened, and an electric circuit is accommodated therein. It is also possible to have openings on both the front surface and the back surface of the body, and to attach a panel to each of these openings. In the trunk part, the tip of the first cover is located near the joint between the panel and the trunk part, and the remaining part is located in the trunk part. The front end portion of the first cover can be positioned on the panel side beyond the joint, or can be positioned on the trunk side without exceeding the joint. The first cover covers the electric circuit from the ceiling surface side and both side surfaces of the trunk portion. The first cover may have a substantially inverted U shape at least in a front shape or a frame shape. In the vicinity of the seam in the body portion, the second cover has the tip end portion of the first cover inserted therein, and is located across the seam.

  In the electrical equipment casing thus configured, the tip of the first cover is covered by the second cover, and the second cover is located across the joint between the panel and the trunk. Therefore, it is possible to prevent dust or dirt that has entered from the joint from entering the inside of the first cover from the front end portion of the first cover.

  The tip of the first cover can be positioned on the panel side beyond the seam. In this case, the front end of the second cover is on the panel side beyond the front end portion of the first cover, and the rear end of the second cover is on the body side beyond the seam.

  If comprised in this way, since the 1st cover and the 2nd cover are located over the joint of a panel and a trunk | drum, the dust and dust which penetrate | invaded from the joint are hard to penetrate | invade in a 1st cover. .

  Furthermore, the panel may have an inclined surface. In this case, the second cover includes an inner sheet that is on the inner side of the first cover and an outer sheet that is on the outer side of the first cover. The tip portions of the inner sheet and the outer sheet have inclined portions corresponding to the inclined surfaces, and the tip portions of the inner sheet and the outer sheet are bonded to each other, the inner sheet and the outer sheet, The tip of the first cover is located between the non-bonded portions.

  When the panel has an inclined surface, the first and second covers need to have an inclined surface correspondingly. Since the tip of the first cover is inserted into the second cover, it is difficult to form the second cover into a shape having an inclined surface from a single sheet. Therefore, the second cover is configured by bonding the inner and outer sheets.

  As described above, according to the present invention, since the tip of the first cover in the vicinity of the joint between the panel and the body is inserted into the second cover located across the joint, Even if dust or dust enters the housing from the joint, entry into the first cover can be reduced.

It is a side view of the housing for electric equipment of one embodiment of the present invention. It is a perspective view which shows the attachment state of the inner cover and outer cover of the housing | casing for electric devices of FIG. It is an expanded view of the inner sheet | seat of the outer cover of the housing | casing for electric devices of FIG. FIG. 3 is a partially omitted enlarged vertical side view of the outer cover of the electric device casing of FIG. 1. FIG. 2 is a partially omitted enlarged longitudinal front view of an outer cover of the electrical equipment casing of FIG. 1. FIG. 3 is a front view, a right side view, and a plan view of an external cover of the electrical equipment casing of FIG. 1. FIG. 2 is a partially omitted enlarged cross-sectional plan view illustrating an attachment state of an inner cover and an outer cover of the electric device casing of FIG. 1 and an attachment state of the outer cover to a trunk portion. FIG. 2 is a partially omitted enlarged vertical front view showing an attachment state of an inner cover and an outer cover of the electric device casing of FIG. 1 and an attachment state of the outer cover to a trunk portion.

  The electrical equipment casing of one embodiment of the present invention is, for example, a casing of a power supply device for a welding machine, and as shown in FIG. 1, a body portion 2, panels such as a front panel 4 and a rear panel 6. have. The trunk | drum 2 is formed in a substantially rectangular parallelepiped shape, the inside is a cavity, and the front side and the back side are made into the rectangular opening. The front panel 4 closes the opening on the front side, and the back panel 6 closes the opening on the back side. The front panel 4 and the back panel 6 cover the front side opening and the back side opening of the trunk portion 2 and extend outward, respectively, and have a substantially rectangular shape when the front end side is viewed from the front side and the back side, respectively. . A seam 8 is formed between the body 2 and the front panel 4, and a seam 10 is also formed between the body 2 and the back panel 6. As shown in FIG. 7, the seam 8 is formed by forming a stepped portion 12 that is recessed in the periphery of the rear end portion of the front panel 4 and fitting the front side opening of the body portion 2 into the stepped portion 12. And dust are less likely to enter the housing. The same applies to the joint 10. These trunk | drum 2, the front panel 4, and the back panel 6 are the products made from a synthetic resin, for example.

  An electric circuit, for example, an electric circuit (not shown) for a power supply device for a welding machine is disposed in the body portion 2. The front panel 4 is provided with electric circuit adjustment switches, knobs, and a display unit (not shown). The rear panel 6 is provided with a power connector, a connector for gas used for welding, and the like (not shown).

  In order to prevent dust, dirt, and water droplets that have entered beyond the step 12 of the joints 8 and 10 from adhering to the electrical circuit in the body 2, the body 2 should be surrounded by the electrical circuit. A first cover, for example an inner cover 14, is arranged. The inner cover 14 is made of, for example, paper, specifically, waterproof paper, and has a rectangular ceiling wall 16 as shown in FIG. 2, and extends downward from both longitudinal edges of the ceiling wall 16 to the ceiling wall 16. On the other hand, the rectangular side walls 18 and 20 are vertically lowered. That is, the front and back shapes of the inner cover 14 are substantially inverted U-shaped. It arrange | positions in the trunk | drum 2 so that the ceiling wall 16 may oppose the ceiling of the trunk | drum 2, and both side walls 18 and 20 may be opposed to the both-sides wall of the trunk | drum 2. FIG. In this arrangement state, the front side edge portions of the side walls 18 and 20 are located inside the trunk portion 2 rather than the seam 8 as shown in FIG. Similarly, the rear edge portions of the side walls 18 and 20 are located inside the trunk portion 2 rather than the joint 10.

  A substantially rectangular extension side wall 22 extends from the entire front edge of the side wall 18 to the front panel 4 side beyond the joint 8 (see FIG. 1), and extends from the entire front edge of the side wall 20 in a substantially rectangular shape. A side wall 24 (not shown) extends beyond the joint 8 to the front panel 4 side. Similarly, the substantially rectangular extension side walls 26 and 28 are extended from the whole edge part of the back side of the side walls 18 and 20 beyond the joint 10 to the back panel 6 side (refer FIG. 1). The extension side walls 22, 24, 26, 28 are formed with screw insertion holes 29 for connecting the body 2 and the electric circuit in the inner cover 14.

  A rectangular inclined wall 30 is formed obliquely upward from the entire edge portion of the ceiling wall 16 on the front panel 4 side toward the front-side opening of the trunk portion 2, and the front surface of the inclined wall 30 extends beyond the joint 8 from the entire front end. A rectangular extended ceiling wall 32 is formed so as to enter the panel 4. Rectangular extension tongues 34 and 36 are formed on one side edge of the inclined wall 30 and one side edge of the extended ceiling wall 32, respectively. Extension tongues 38 and 40 (both not shown) are formed on the other side edge of the inclined wall 30 and the other side edge of the extended ceiling wall 32. Similarly, a rectangular inclined wall 42 is formed obliquely upward from the entire edge of the ceiling wall 16 on the back panel 6 side toward the back side opening of the trunk portion 2, and the joint 10 is formed from the entire tip of the inclined wall 42. A rectangular extended ceiling wall 44 is formed so as to enter into the back panel 6 beyond. Rectangular extension tongues 46, 48, 50 and 52 are formed on both side edges of the inclined wall 42 and both side edges of the extended ceiling wall 44. Since the extended ceiling walls 32 and 44 and the inclined walls 30 and 42 are provided, water droplets entering the inside of the housing from the upper portions of the joints 8 and 10 travel on the ceiling wall 16 through the inclined walls 30 and 42. Water droplets do not adhere to the electric circuit in the inner cover 14.

  The second cover, for example, the outer covers 54 and 56, covers the front panel 4 and the body 2 so as to cover the tips of the extended ceiling walls 32 and 44 and the extended side walls 22, 24, 26 and 28 of the inner cover 14. The rear panel 6 and the body portion 2 are disposed in the casing. Since the outer covers 54 and 56 have the same configuration, only the outer cover 54 will be described in detail, and the same portions will be denoted by the same reference numerals and description thereof will be omitted. The outer cover 54 is also made of, for example, paper, specifically waterproof paper, and includes an inner sheet 57, an outer sheet 58, and an adhesive band 60 as shown in FIG.

  The inner sheet 57 has a rectangular ceiling wall 62, and side walls 64 and 66 are integrally formed at both end edges thereof. The side walls 64 and 66 are formed in a substantially pentagonal shape. That is, the side walls 64, 66 have inclined edges 68, 70 located on the outer side as they extend laterally from one longitudinal edge of the ceiling wall 62, and further to the side from the tips of these inclined edges 68, 70. The straight edges 72 and 74 are directed to the inner edges of the straight edges 72 and 74. Moreover, it has the linear edges 80 and 82 which extended the other longitudinal edge of the ceiling wall 62 to the both sides, respectively. Leg pieces 84 and 86 having a substantially rectangular shape are formed at ends of the straight edges 76 and 78 on the straight edges 80 and 82 side.

  Similarly to the inner sheet 57, the outer sheet 58 also has a ceiling wall 86, side walls 88 and 90, and leg pieces 92 and 94. The ceiling wall 86 has the same length as the ceiling wall 62 but has a short width. The side walls 88, 90 have inclined edges 96, 98 corresponding to the inclined edges 68, 70 of the side walls 64, 66, which are the same inclination and the same length as the inclined edges 68, 70. Further, the side walls 88, 90 have straight edges 100, 102 corresponding to the straight edges 72, 74 of the side walls 64, 66, which are also the same length as the straight edges 72, 74. The side walls 88, 90 also have straight edges 104, 106 of the same length corresponding to the straight edges 76, 78 of the side walls 64, 66. The leg pieces 92 and 94 have the same length as the leg pieces 84 and 86 of the inner sheet 57, but their width dimension is short.

  The inner sheet 57 and the outer sheet 58 are bonded by overlapping the outer sheet 58 on the inner sheet 57 and bending the side walls 64, 66, 88, 90 at right angles to the ceiling walls 62, 86. That is, one side edge of the ceiling walls 62 and 86 is aligned, the inclined edges 68 and 96 of the side walls 64 and 86 are aligned, the inclined edges 70 and 98 of the side walls 66 and 90 are aligned, and the straight lines of the side walls 64 and 88 are aligned. With the edges 72, 100 aligned and the straight edges 74, 102 of the side walls 66, 90 aligned, the side walls 64, 66, 88, 90 are folded at right angles to the ceiling walls 62, 86 to contact each other. A region indicated by an alternate long and short dash line in FIG. 3 on one side edge of the ceiling walls 62 and 86 of the surface, the inclined edges 68 and 96, and the straight edges 72 and 100 side is adhered with an adhesive 108 as shown in FIG. is there.

  The adhesive band 60 is made of, for example, a rectangular double-sided tape, and is arranged such that one long side thereof coincides with the straight edges 110 and 112 on the inclined edges 96 and 98 side of the leg pieces 92 and 94 of the outer sheet 58. 4 and FIG. 5 is adhered by one of the adhesive layers 114.

  6A to 6C are a front view, a side view, and a plan view of the external cover 54 in an assembled state. In FIG. 6A, the adhesive layer of the adhesive band 60 is omitted.

  These outer covers 54, 56 are arranged such that the inclined edges 68, 70, 96, 98 of the side walls 64, 66, 88, 90 are located in the front panel 4 and the rear panel 6 away from the seams 8, 10, The other adhesive layer 116 of the adhesive band 60 is used to attach to the ceiling wall and both side walls of the front panel 4 and the back panel 6 as shown in FIGS. The inclined edges 68, 70, 96, and 98 are formed, as shown in FIG. 1, the front panel 4 and the rear panel 6 have an inclined surface at the upper part thereof, and are inclined to face the inclined surface. This is because the edges 68 and 70 are placed in the front panel 4 and the back panel 6. With the arrangement as described above, the side walls 64, 66, 88, 90 of the outer covers 54, 56 enter the body portion 2 beyond the joints 8, 10. In this arrangement state, as shown in FIG. 2, the screw insertion holes 29 of the extension side walls 22, 24, 26, 28 overlap with the straight edges 80, 82 of the inner sheet 57, so that they are inserted into the screw insertion holes 29. As shown in FIG. 3, a notch 118 is formed at a position corresponding to the screw insertion hole 29 of the straight edges 80 and 82 in order to allow the screw to enter the inner cover 14.

  Since the outer sheets 54 and 56 are bonded to the inner sheet 57 and the outer sheet 58 as described above, the outer covers 54 and 56 have a bag shape opened on the body 2 side. As shown in FIGS. 1 and 2, the extended side walls 22, 24, 26, 28, the extended ceiling walls 32, 44, the extended tongue pieces 36, 40, etc. of the inner cover 14 enter. In FIG. 2, only the outer cover 54 is shown, and the outer cover 56 is omitted.

  Accordingly, the outer covers 54 and 56 and the inner cover 14 are positioned at the joints 8 and 10, and dust and dirt that have entered the housing from the joints 8 and 10 reach the electric circuit in the inner cover 14. It is difficult to attach dust and dirt to these electric circuits. Further, since the inclined edges 68, 70, 96, 98 and the straight edges 72, 74, which are the tips of the outer covers 54, 56, are located in the front panel 4 and the rear panel 6 away from the seams 8, 10, more and more. Dust and dust are unlikely to reach and adhere to the electric circuit in the inner cover 14.

  In the above-described embodiment, the inner cover 14 and the outer covers 54 and 56 are shown as having no bottom, but those having a bottom can also be used. In the above-described embodiment, the front panel 4 and the back panel 6 are separate from the body 2, but one of which is configured integrally with the body 2 can also be used. In that case, only the outer covers 54 and 56 that are arranged on the side that is configured separately from the body 2 are used. In the above embodiment, the inner cover 14 provided with the extended ceiling walls 32 and 44 is used. However, it is also possible to use one that does not use these. In that case, the front and back end portions of the ceiling wall 16 of the inner cover 14 are inserted into the space between the ceiling walls 62 and 84 of the outer covers 54 and 56. In the above embodiment, the outer covers 54 and 56 have inclined edges 68, 70, 96, and 98 because the front panels 4 and 6 have inclined surfaces on the top. When the front panel 4 and the back panel 6 do not have inclined surfaces, these inclined edges 68, 70, 96, 98 are unnecessary. In that case, it is not necessary to form the outer covers 54 and 56 separately from the inner sheet 57 and the outer sheet 58, and the outer sheet can be formed by bending one sheet. In the above embodiment, the case of the power supply device for the welding machine is shown as an example of the case for the electric device. However, other electric device case, such as a power supply device for plating, can be used. In the above-described embodiment, the double-sided tape is used as the adhesive band 60. However, the present invention is not limited to this, and for example, a belt-like one having adhesive layers on both sides can also be used as the adhesive band.

2 Body 4 Front panel 6 Rear panel 8 10 Seam 14 Inner cover 54 56 Outer cover

Claims (3)

A body is attached to the opening of the body having a hollow interior and at least one of the front surface and the back surface having an opening, and a body portion in which an electric circuit is accommodated.
In the trunk portion, a tip portion is located near the joint between the panel and the trunk portion, the remaining portion is located in the trunk portion, and covers the electric circuit from the ceiling surface side and both side surfaces of the trunk portion. A first cover,
In the vicinity of the seam in the body portion, the front end of the first cover is inserted therein, and the second cover is located across the seam.
A housing for electrical equipment.   2. The electrical equipment casing according to claim 1, wherein a front end portion of the first cover is located on the panel side beyond the joint, and a front end portion of the second cover is a front end portion of the first cover. And the rear end of the second cover extends beyond the seam and is located on the body side.   3. The electrical equipment casing according to claim 2, wherein the panel has an inclined surface, and the second cover includes an inner sheet that is on an inner side than the first cover, and the first cover. An outer sheet on the outside, and tip portions of the inner sheet and the outer sheet have inclined portions corresponding to the inclined surfaces, and the tip portions of the inner sheet and the outer sheet are bonded to each other. A housing for an electric device in which a tip portion of the first cover is located between non-adhered portions of the inner sheet and the outer sheet.

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