JP6616128B2 - Dustproof filter for electrical equipment - Google Patents

Description

  The present invention relates to a dustproof filter for electrical equipment, and more particularly to a removable filter.

  In many cases, an electric device is configured in a housing, and the components of the electric device are accommodated in the housing. In order to cool these components, air may be introduced into the housing from a vent provided in the housing. In this case, in order to prevent dust and dust from being introduced into the housing together with air introduced into the housing, a dustproof filter may be provided in the housing. An example thereof is disclosed in Patent Document 1.

  According to the technique disclosed in Patent Document 1, the housing has an upper surface opened and a plurality of vent holes on the side surface. The upper cover covers the opening on the upper surface. Inside the case, a fan is mounted facing the vent, and a filter mounting part is provided on the back side of the fan (opposite to the side on which the vent is formed). The filter is attached through the opening for attaching the filter.

JP 2007-327471 A

  According to the technique of Patent Document 1, the filter can be easily attached and detached. However, for example, a filter may not be necessary depending on the use environment of the electric device, and the user of the electric device may select whether or not to install the filter.

  For example, when attaching a filter to the vent from the outside, it is conceivable to screw the filter to the case, but when the filter is not attached according to the user's choice, the screw hole will be visible from the outside, and it will not look good Become. And when it becomes necessary to attach a filter, it is necessary for a maintenance worker to bring the tool for screwing to an installation place, and workability | operativity is not good. In addition, when the environment is poor and frequent filter replacement or maintenance is required, it is troublesome to perform the screwing operation each time, and there is a problem that the efficiency is low, such as taking a long working time.

  An object of this invention is to provide the filter which can be attached easily and firmly, when attaching so that a ventilation hole may be covered from the exterior of the ventilation hole of the housing | casing of an electric equipment.

The dustproof filter for an electrical device of one embodiment of the present invention has a frame. The frame body is disposed so as to cover the entire periphery of the plurality of vent holes penetrating inward and outward on one surface of the housing in which the electric device is accommodated, and has an opening positioned facing the plurality of vent holes. doing. Various electrical equipment can be used, for example, an arc welding machine, a plating apparatus, an uninterruptible power supply apparatus, and the like. The housing has various shapes, but the shape is arbitrary as long as a plurality of ventilation holes are formed on one surface. The shape of the vent can be various shapes such as a circle and a long hole. The plurality of vents are arranged, for example, in a polygonal shape, a circular shape, an elliptical shape, or the like. The frame body only needs to have an opening that covers the entire vent, and is, for example, polygonal, circular, or elliptical. A dust removing material can be accommodated inside the frame . As the dust removing material, for example, various materials can be used as long as they can capture dust entering the housing from the outside of the housing via the vent. A fixture is provided at the periphery of the opening in the frame. The fixture includes a thin plate-like insertion piece having flexibility, and the insertion piece is inclined at an acute angle with respect to the opening and protrudes toward the vent hole side. The fixture can be formed integrally with the frame, for example, or can be attached separately to the frame. The insertion piece is engaged with the edge of the corresponding vent in the incomplete return state from the bent state to the corresponding vent, and the tip of each insertion piece has the corresponding It has a curved portion that is large enough to pass through the vent and is curved on the opening side . The portion that engages while being bent at the edge of the vent hole of the insertion piece is preferably a position close to the frame near the base of the insertion piece formed in the fixture.

In the dust filter for electrical equipment configured as described above, the frame body is pushed toward the housing from the state where the insertion piece formed on the frame fixture is opposed to the edge of the ventilation hole, and the insertion piece is inserted into the ventilation hole. When the frame is attached to the housing, the insertion piece engages with the ventilation hole in a bent state. The edge of the vent is pressed in a direction away from the opening in order to return to the original unbent state. Therefore, the frame is firmly fixed to one surface of the casing in a state where the pressing force is applied to the casing in a certain direction. In addition, as the mounting work, the insertion piece of the mounting tool is simply bent and penetrated into the vent hole, which is an easy work that requires no tools as compared with the screwing work. Further, when the frame body is pulled away from the housing, the insertion piece is bent again in the direction of the opening and comes out of the vent, so that the frame body can be removed from the housing. That is, the filter can be easily attached to and detached from the housing without the need for a tool, and the filter can be easily cleaned. As described above, since the frame mounting tool is attached to the ventilation hole of the housing, the mounting holes and the like are exposed from the outside even when the frame is removed when the dustproof filter for electrical equipment is not required. There is nothing. In addition, since the fixture is provided on the periphery of the opening formed inside the frame body, the area for attaching the frame body may be small, and the size of the frame body is larger than the opening covering the vent hole. The entire apparatus can be reduced in size. In addition, when the frame is attached to or detached from the housing, the insertion piece can be smoothly bent using the bending portion as a guide when the bending portion at the tip of the insertion piece is bent while contacting the edge of the vent. Further, it is possible to prevent an operator who attaches / detaches the frame body to / from the housing from being injured at the tip of the insertion piece.

In the above aspect, the frame body includes an inner frame in which the opening on the side facing the casing is formed, an outer frame having an opening in which a crosspiece is formed in the vertical and horizontal directions on the opposite side of the casing, The dust removing material can be held in a space defined by the inner frame, the outer frame, and the wall. In this case, for example, when exchanging the dust removing material, when the frame body is attached to and detached from the housing, the dust removing material is held in the space and does not fall, and the maintainability can be improved.

The vents may be formed so as to be aligned vertically and horizontally. In this case, each said fixture is formed in the four corners of the said opening, and the said insertion piece is penetrated by the said vent hole of the four corners formed in the outermost periphery among the said vent holes.

  If comprised in this way, a frame can be fixed to one surface of a housing | casing in several places, and a frame body can be firmly fixed to one surface of a housing | casing. Furthermore, when the frame is attached to the casing at the four corners, the insertion piece of the fixture is engaged with the edge of the vent in a bent state and presses the entire frame in the direction away from the opening. While pressing the whole so as to be pulled in the direction of close contact with the casing, one side of the opening edge of the frame body on which the insertion piece is formed is pulled away from the opening, and the other piece of the opening edge is in the opposite direction. Therefore, the frame body is attached and positioned with uniform pressing force in the housing direction and the outer peripheral direction with respect to the housing, and the position of the frame body does not change during use. Further, when the frame is in close contact with the housing, dust does not enter from the gap, and a strong dustproof effect can be obtained.

  As described above, according to the present invention, when it is necessary to attach a filter to the vent on one side of the housing, it can be easily attached, and in the attached state, the filter is firmly attached. In addition, it is possible to prevent dust and dust from entering the housing through the air vents from the gap between the frame and the housing, and the dustproof effect can be enhanced.

It is a figure which shows the attachment process of the dustproof filter for electrical devices of one Embodiment of this invention. It is a front view of the electric equipment before and behind the attachment of the dustproof filter for electric equipment of one Embodiment of this invention. It is a front view of the dust filter for electric equipment of one embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially omitted enlarged front view and a partially omitted enlarged vertical side view of a dustproof filter for an electrical device according to an embodiment of the present invention. It is a schematic side view of the dustproof filter for electric devices of other embodiment of this invention.

  The dustproof filter for an electric device according to one embodiment of the present invention is attached to a housing of the electric device as shown in FIG. As the electrical equipment, various devices such as an uninterruptible power supply, a plating power supply, and an arc welder can be used. This electric apparatus has a vertically long rectangular parallelepiped casing 2. A plurality of vent holes 6 are formed on one surface of the casing 2, for example, below the openable / closable door 4 so as to penetrate inside and outside, and air is introduced into the casing 2 through the vent holes 6. Cool the parts placed inside. The vent 6 is formed in a long hole having two long edges that are arc-shaped at both ends and that connects these two arc-shaped ends up and down. The vent 6 is formed vertically and horizontally so that the two long edges are horizontal.

  In this electrical device, for example, depending on the use environment, dust may easily enter the housing 2, and in order to prevent the intrusion, the filter according to the present invention is as shown in FIG. It can be attached to the door 4 so as to cover the entire vent 6. In other words, this filter is an optional product that is attached only when necessary.

  The filter includes a frame body 8, a fixture 28, and a filter material 26. As shown in FIG. 2 (b), the frame 8 is a rectangular shape having a width dimension and a height dimension that can cover all the vent holes 6, and FIGS. 1 (a) to 1 (c) and As shown in FIG. 3, in the state which attached the filter to the door 4, it has the inner frame 20 which faces the door 4 side, and the outer frame 22 of the opposite side. The inner frame 20 and the outer frame 22 are integrated by upper walls 10 and 12 that are parallel to each other with a space in the vertical direction, and side walls 14 and 14 that connect the upper wall 10 and the lower wall 12.

  The inner frame 20 has a rectangular opening 18, and the opening 18 has a width dimension and a length dimension in which all the vent holes 6 enter the inside. The outer frame 22 also has a rectangular opening 23, and a crosspiece 24 is formed in the opening 23 vertically and horizontally as shown in FIG.

  A dust removing material, for example, a filter material 26 is accommodated inside the frame body 8. The filter material 26 is formed in a substantially rectangular shape, and its peripheral edge is located in the frame 8, that is, in a space formed by the upper wall 10, the lower wall 12, the side walls 14, 14, the inner frame 20, and the outer frame 22. And is held.

  In order to attach this filter to the door 4, the frame 8 is provided with a fixture 28 shown in FIGS. 4 (a) and 4 (b). As shown in FIG. 3, the fixtures 28 are respectively provided at the four corners on the top, bottom, left and right of the opening 18 of the inner frame 20 of the frame body 8. When the filter is attached to the door 4, the installation positions of these attachments 28 are positions corresponding to the upper and lower vents 6 at the left and right ends as indicated by phantom lines in FIG. . Specifically, in FIG. 2A, the fixture 28 inserted into the left vent 6 is located at the right end of the long edge of the vent 6, and the fixture 28 inserted into the right vent 6 is It is located at the left end of the long edge of the vent 6.

  The fixture 28 is made of, for example, a thin plate-like metal having flexibility. As shown in FIG. 4B, the fixture 28 has a fixing portion 30 fixed to the upper wall 10 and the lower wall 12. Although not shown, the fixing portion 30 is not shown. It is fixed by screwing or the like. The fixing portion 30 is bent along the inner frame 20 from the upper wall 10 and the lower wall 12 and extends to the edge of the opening 18.

  The fixing portion 30 is bent from the extended end to the door 4 side, and an insertion piece 34 protruding from the inner frame 20 to the door 4 side is formed. A curved portion 36 that is curved in an arc shape toward the direction of the opening 18 is formed at the tip of the insertion piece 34 so as to be able to pass through the vent hole 6. Since the insertion piece 34 has a length dimension that allows the insertion piece 34 to enter the vent hole 6 and forms an acute angle with the inner frame 20, the front surface of the curved portion 36 formed at the tip of the insertion piece 34 is illustrated in FIG. As indicated by phantom lines in FIG. 1 (a), it is at a height position shifted vertically from the hole of the vent 6 corresponding to the front surface of the curved portion 36, and at the upper edge or the lower edge of the lower end of the vent 6 at the four corners. opposite. Therefore, if the insertion piece 34 is to be inserted into the vent 6, the insertion piece 34 needs to bend toward the opening 23. Further, in a state where the insertion piece 34 is inserted into the vent hole 6, the insertion piece 34 against the inner frame 20 of the insertion piece 34, that is, the door 4 so as to press the long edge of the vent hole 6 away from the opening 18. An angle is set. Since the distal end of the insertion piece 34 is a curved portion 36 that is curved toward the opening 18, when the insertion piece 34 is inserted into the vent 6, the long edge of the vent 6 abuts on the curved portion 36. Thus, the bending portion 36 becomes a guide, and the insertion piece 34 can be smoothly bent toward the opening 18 side.

  As shown in FIG. 3, the fixtures 28 are attached to the left, right, top and bottom of the inner frame 20, and the fixtures 28 are arranged so as to face the attachment positions indicated by phantom lines in FIG.

  The filter is attached to the door 4 using the attachment 28 as shown in FIGS. As shown in FIG. 1A, when the filter is opposed to the position where the filter is attached to the door 4, the curved portion 36 at the tip of the insertion piece 34 of the fixture 28 is above or below the vent 6 at the four corners of the door 4. It is arranged at a position that opposes the section edge. Then, as shown in FIG. 1B, the filter is moved to the door 4 side, and the curved portion 36 at the tip of the insertion piece 34 of the upper fixture 28 comes into contact with the upper long edge of the corresponding vent 6. The insertion piece 34 of the lower attachment 28 abuts the lower long edge of the corresponding vent 6 and the insertion piece 34 is smoothly bent toward the opening 18 so as to be guided by the bending of the bending portion 36. The frame 8 is pushed in the direction of the door 4 as it is. As a result, the insertion piece 34 penetrates into the vent 6 of the door 4 while further bending, and presses the frame body 8 until the inner frame 20 of the frame body 8 abuts against the door 4, as shown in FIG. In this way, the filter is attached to the door 4.

  At this time, as shown in FIG. 6C, the insertion piece 34 once bent tries to return to the original state, but the upper insertion pieces 34, 34 have the upper long edge of the vent 6. The lower insertion pieces 34, 34 are engaged with the lower long edge of the vent 6 while pressing downward on the upper side away from the opening 18. The angle of each insertion piece 34 with respect to the inner frame 20 remains slightly larger than the original acute angle, and has not completely returned to the original acute angle state. Accordingly, the force that each insertion piece 34 attempts to return to the original angle with respect to the inner frame 20 acts as a force that presses the inner frame 20 toward the door 4 side. As a result, the filter frame 8 is firmly attached to the door 4, and the degree of adhesion to the door 4 is increased. In addition, since the insertion piece 34 is bent, in this example, the vicinity of the base of the upper insertion piece 34 pushes the edge of the vent 6 away from the opening 18, that is, the upper side, and the lower insertion piece. Since the force acts so that the vicinity of the root of 34 pushes the edge of the vent hole 6 away from the opening 18, that is, the lower side, the backlash of the filter with respect to the door 4 is prevented and the filter can be firmly attached. .

  Since the filter can be attached to the door 4 simply by bending the insertion piece 34 of the attachment 28 and attaching it through the vent 6 in this manner, the attachment work is easy. In addition, since the filter frame 8 is in close contact with the door 4, dust hardly enters the vent 6 from the gap between the mounting surfaces. Further, since the frame body 8 is attached to the door 4 inside the filter frame body 8, the size of the frame body 8, that is, the filter only needs to be slightly larger than the opening 18, and the filter can be miniaturized. . Further, in order to attach the filter to the door 4, the insertion piece 34 of the fixture 28 provided on the frame body 8 is made to communicate with the vent hole 6, so that the hole for attaching the filter can be obtained even when the filter is removed. Etc. are not exposed, and the appearance is not impaired.

  Further, since the insertion piece 34 is engaged with the upper long edge of the upper vent 6 and the lower long edge of the lower vent 6, the attached frame body 8 moves in the vertical direction. Never do. Further, as described above, the fixture 28 inserted into the vent 6 on the left side in FIG. 2A is located at the right end of the vent 6 and is attached to the vent 6 on the right side. Since 28 is located at the left end of the vent 6, the frame 8 attached to the door 4 does not move in the left-right direction. That is, the frame body 8 is firmly positioned in each of the vertical and horizontal directions.

  When removing the filter, the frame body 8 is pulled to the opposite side of the door 4 so that the curved portion 36 at the tip of the insertion piece 34 is smoothly bent toward the opening 18 while abutting against the long edge of the vent hole 6. Therefore, it is only necessary to escape from the corresponding vent 6 in this state.

  Since the distal end of each fixed piece 34 is a curved portion 36, the insertion piece 34 bends smoothly while contacting the long edge of the air port 6 along the curve. The operator can be prevented from being injured by the tip of the fixed piece 34 during the work without being caught in the mouth 6.

  In the above embodiment, since the ventilation holes 6 are arranged vertically and horizontally, the filter frame 8 is also rectangular. However, when a plurality of ventilation holes 6 are arranged, for example, concentrically, the frame is also circular. What is necessary is just to form. In that case, the opening 18 of the frame 8 is formed so as to be located slightly outside the vent hole 6 arranged in a circle on the outermost periphery, and is formed at, for example, the upper end and the lower end of the vent hole 6 on the outermost periphery. What is necessary is just to arrange | position the fixture 28 so that the insertion piece 34 of the fixture 28 may be inserted in a certain thing. Moreover, although each vent hole 6 was formed in the long hole, it can also be formed in a rectangle and can also be formed in a circle. In that case, the insertion piece 34 of the fixture 28 can also be formed in an arc shape that matches the edge of the vent, or can be a plate that contacts the edge of the circular vent in two places. In the above embodiment, the vent 6 is formed such that the long edge is horizontal, but it can also be formed so that the long edge is vertical. Further, in the above embodiment, four attachments 28 are used for attachment without rattling, but a minimum of one attachment may be used. In the above embodiment, the insertion piece 34 is formed integrally with the fixing portion 30, but the insertion piece 34 may be formed integrally with the inner frame 20 of the frame 8.

  Further, as shown in FIG. 5, the inner frame 20 is omitted, the frame body 8 is constituted only by the outer frame 22, and the fixture 28 is shown in FIG. 5 so as to protrude to the door 4 side of the outer frame 22. In this way, the filter can be formed integrally with the outer frame 22 or can be a filter in which a separately formed fixture 28 is fixed to the outer frame 22 and the filter material 26 is directly sandwiched between the outer frame 22 and the door 4.

2 Housing 4 Door (One side of the housing)
6 Vent 8 Frame 26 Filter material (dust removal material)
28 Attachment 34 Insertion piece

Claims (3)

A frame having an opening that is disposed so as to cover the entire periphery of the plurality of vent holes penetrating inward and outward on one surface of the housing in which the electric device is housed, and has an opening that faces the plurality of vent holes;
A dust removing material that can be accommodated inside the frame;
A fitting provided on the periphery of the opening in the frame body, and having a flexible thin plate-like insertion piece that is inclined at an acute angle with respect to the opening and protrudes toward the vent hole side. The fixture provided ,
Have
The insertion piece is engaged with an edge of the corresponding vent in the incomplete return state from the bent state to the corresponding vent and the tip of the insertion piece has the corresponding vent A dust-proof filter for an electric device having a curved portion that is large enough to pass through the mouth and curved on the opening side .   2. The dust filter for an electrical device according to claim 1, wherein the frame includes an inner frame in which the opening on the side facing the housing is formed, and an opening in which a crosspiece is formed on the side opposite to the housing. And an outer frame that connects the inner frame and the outer frame, and the dust removing material is held in a space formed by the inner frame, the outer frame, and the wall. Dust-proof filter. 3. The dust filter for an electrical device according to claim 1 , wherein the vent is formed to be aligned vertically and horizontally, and the fixture is formed at four corners of the opening, and is formed at an outermost periphery of the vent. A dustproof filter for electrical equipment, wherein the insertion piece is inserted through the vents at the four corners.

Images