JP2013004950A - Blower duct of semiconductor power converter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a blower duct, in which a lower duct is attached to an upper duct, that attaching and detaching of the lower duct to/from the upper duct is laborious.SOLUTION: A blower duct 1 includes an upper duct 2, a lower duct 3, and a slide guide rail part 4 for assembling the lower duct into the upper duct slidably and detachably. The rail part includes guide body parts 5 and 6 provided to the lower part of the upper duct, and a pair of right and left wing parts 7 and 8 provided to the lower duct. The guide body part includes a pair of, front and rear, first and second lower duct support members 9 and 10. The wing part of the lower duct includes first and second lower duct support member engagement parts 11 and 12 which engage with the first and second lower duct support members at a lower duct fixing position, and disengage from the first and second lower duct support members at a lower duct dismounting position, to allow separation of the lower duct from the lower surface of the upper duct.

Description

  The present invention relates to a blower duct for guiding cooling air introduced into a housing by a blower to a semiconductor element in a semiconductor power conversion device, and in particular, the blower duct is composed of an upper duct and a lower duct, and the upper duct is connected to the lower duct. Is detachably and slidably attached.

  As the blower duct of the semiconductor power conversion device, as shown in FIG. 9, the blower 104 sucks the inside air 102 of the housing 101 of the semiconductor power conversion device and discharges the cooling air 103, and the air direction toward the semiconductor switching element (not shown). A blower duct 107 including a lower duct 105 and an upper duct 106 for guiding is known.

  In the blower duct 107, the following two methods are known as methods for attaching the lower duct 105 to the upper duct 106.

  As shown in FIG. 10, screw receiving pieces 108, 109, 110, and 111 are provided at the left and right ends of the lower duct 105 in the insertion direction of the lower duct 105 into the housing 101, and these screw receiving pieces 108, 109 are provided. , 110 and 111 are attached to the bottom surface of the upper duct 106 with screws 112.

  As shown in FIG. 11, the upper duct 106 is provided with a slide guide rail portion 113, and the lower duct 105 is attached to the slide guide rail portion 113 so as to be detachable and slidable. This is a slide system that is pulled out from the opening 101a. (No patent document suitable as a conventional example could be found, but there are, for example, Patent Documents 1 and 2 similar to the above-mentioned slide method).

JP 2000-41309 A JP-A-8-9522

By the way, the screwing method and the sliding method have the following advantages and problems.
(1) In the screwing method, as described above, screw receiving pieces 108, 109, 110, and 111 are provided in the lower duct 105, and these screw receiving pieces 108, 109, 110, and 111 are attached to the bottom surface of the upper duct 106 with screws 112. Since the structure is simple and can be manufactured at a low cost, there is an advantage that screwing work, in particular, the work of screwing the screw receiving piece 108 etc. on the front end side in the insertion direction into the housing 101 is performed. Since the user has to insert the hand all the way into the housing 101, the work is troublesome and the work efficiency is poor.
(2) In the sliding method, the lower duct 105 is slidably engaged with the slide guide rail portion 113 provided on the upper duct 106 and the lower duct 105 is assembled to the upper duct 106. Although there is an advantage that it can be easily performed as compared with the screwing method, since the slide guide rail portion 113 is required, the number of parts is increased, and an operation of attaching the slide guide rail portion 113 to the upper duct 106 is required. Therefore, there is a problem that the cost becomes high.

  As shown in FIG. 12, the blower duct 120 and the blower duct 120 that can be partially assembled outside including the lower duct 105 and the fan 104 attached to the exhalation part 105a are provided from the opening 101a of the casing 101 shown in FIG. In order to pull out straightly, as shown in FIG. 9, the width W1 of the blower and blower duct 120 that can be partially assembled outside must be narrower than the inner width W2 of the casing 101, and the partial assembly is performed outside. There is a problem that the possible blower and the width W1 of the blower duct 120 are limited.

  Also, as shown in FIG. 13, in order to remove the lower duct 105 from the slide guide rail portion 113 inside the housing 101, the depth dimension D of the housing 101 must be increased, and the semiconductor power conversion device There was a problem that became large.

  An object of the present invention is to provide a blower duct that has both the advantages of the screwing method and the sliding method, in which the lower duct can be removed from the slide guide rail portion within the housing.

  A blower duct according to a first aspect of the present invention is a blower duct of a semiconductor power conversion device that guides cooling air introduced into a casing by a blower to a semiconductor element, and the blower duct includes an upper duct, a lower duct, and an upper duct. The lower guide has a slide guide rail part for detachably attaching the lower duct, and the slide guide rail part is provided on the lower part of the upper duct and on the left and right side parts parallel to the insertion direction to the housing. A guide main body portion that slidably supports the lower duct between the lower surface of the upper duct and a left and right side portion of the lower duct, and is slidably inserted between the lower surface of the upper duct and the lower duct support piece. The guide body includes a pair of front and rear first and second lower duct support pieces provided with a predetermined gap in the front-rear direction. The wing portion engages on the first and second lower duct support pieces to support the lower duct at the lower duct fixing position, and the first and second lower duct support pieces at the lower duct removal position. The first and second lower duct support piece engaging portions that allow the lower duct to be removed from the upper duct by disengaging from the upper duct.

  According to a second aspect of the present invention, in the blower duct of the semiconductor power conversion device according to the first aspect, the wing portion is provided between the first lower duct support piece engaging portion and the second lower duct support piece engaging portion. The second lower duct support piece and the first lower duct support piece and the first lower duct support piece by positioning the second lower duct support piece in the opening. The second lower duct support piece engaging portion can be aligned in a state where they are not engaged with each other (non-engaged state).

  According to a third aspect of the present invention, in the blower duct of the semiconductor power conversion device according to the first or second aspect, the first lower duct support piece is arranged in a front-rear direction with respect to the second lower duct support piece. The inner side surface of the first lower duct support piece is formed in a slanted surface that becomes narrower as it approaches the second lower duct support piece and is engaged with the first lower duct support piece. The lower duct support piece engaging portion is formed to be longer in the front-rear direction than the second lower duct support piece engaging portion, and the inner surface thereof approaches the second lower duct support piece engaging portion. It is wide and is formed on an inclined surface parallel to the inclined surface of the first lower duct support piece.

  According to a fourth aspect of the present invention, in the blower duct of the semiconductor power conversion device according to any one of the first to third aspects, the lower duct is configured such that the lower duct is disposed on the rear end side in the insertion direction to the housing and the lower surface of the upper duct. A screw receiving piece for screwing is provided.

  According to a fifth aspect of the present invention, in the blower duct of the semiconductor power conversion device according to any one of the first to fourth aspects, the first and second lower duct support pieces are formed by cutting a part of the upper duct. It is characterized by being.

(1) The blower duct according to claim 1 is configured such that the first and second lower duct support piece engaging portions of the lower duct are engaged with the first and second lower duct support pieces of the upper duct to engage the lower duct. Can be attached to the upper duct. Further, the lower duct can be removed from the upper duct by disengaging the first and second lower duct support pieces and the first and second lower duct support piece engaging portions.
(2) In the blower duct according to claim 2, the position of the second lower duct support piece of the upper duct is aligned with the opening provided between the first and second lower duct support piece engaging portions of the lower duct. Then, the lower duct is superimposed on the lower surface of the upper duct by pushing up the lower duct. Then, the lower duct is slid along the lower surface of the upper duct to the rear end side of the housing, so that the first and second lower duct support piece engaging portions are moved to the first and second lower parts. It can be engaged on the duct support piece.
(3) In the blower duct according to claim 3, the inner surface of the first lower duct support piece is formed into an inclined surface that becomes narrower as it approaches the second lower duct support piece. The inner surface of the first lower duct support piece engaging portion that engages with the lower duct support piece becomes wider as it approaches the second lower duct support piece engaging portion, and the first lower duct support piece When the lower duct is slid from the lower duct removal position to the lower duct fixing position, the first lower duct support piece and the sliding amount of the lower duct are set. The overlapping region of the first lower duct support piece engaging portions is lengthened, whereby the inner end side of the lower duct can be reliably supported.
(4) In the blower duct according to the third aspect, since the lower duct is provided with the screw receiving piece for screwing the lower duct to the upper duct on the rear end side in the insertion direction to the casing, Since it is located facing the opening, the screw receiving work of the screw receiving piece can be easily performed from the opening. (As in the conventional example, it is not necessary to insert the hand all the way into the case and screw it.)
(5) In the blower duct according to claim 4, the first and second lower duct support pieces can be easily formed integrally with the upper duct by cutting and raising a part of the upper duct.

The perspective view of the principal part. The front view of the principal part. CC sectional drawing of FIG. DD sectional drawing of FIG. The perspective view of the blower duct which couple | bonded the upper duct and the lower duct. The perspective view of the blower duct which isolate | separated the upper duct and the lower duct. The bottom view which shows the state which made the lower duct slide to the fixed position. The bottom view which shows the state which made the lower duct slide to the removal position. The front view which shows the use condition of the blower of a semiconductor power converter device. The perspective view which shows an example of the lower duct used for a screwing system. The side view which shows a slide system. The perspective view of the blower and blower duct which can be partially assembled outside. Explanatory drawing which shows the problem of a slide system.

  1 is a perspective view showing a use state of a blower duct of a semiconductor power converter, FIG. 2 is a front view, FIG. 3 is a sectional view taken along the line CC in FIG. 2, and FIG. 4 is a sectional view taken along the line DD in FIG. In each figure, a solid line indicates a state where the upper duct and the lower duct are coupled, and a chain line indicates a state where the lower duct is removed from the upper duct.

  As shown in FIGS. 1 to 4, the blower duct 1 includes an upper duct 2, a lower duct 3, and a slide guide rail portion 4 that detachably attaches the lower duct 3 to the lower surface of the upper duct 2. . A blower 3 a is provided at the lower part of the lower duct 3.

  As shown in FIG. 5, the slide guide rail portion 4 is provided on the lower surface side of the upper duct 2 and a pair of left and right guide main body portions 5 and 6 that slidably support the lower duct 3 with the lower surface. And a pair of left and right wings 7 and 8 which are provided in the lower duct 3 and are slidably inserted between the lower surface 2 a of the upper duct 2 and the guide main body parts 5 and 6.

  The pair of left and right guide body portions 5 and 6 includes a pair of front and rear first and second lower duct support pieces 9 and 10 provided with a predetermined gap in the front and rear direction.

  As shown in FIG. 6, the first lower duct support piece 9 is formed longer in the front-rear direction than the second lower duct support piece 10. The inner side surface 9 a of the first lower duct support piece 9 is formed as an inclined surface that becomes narrower as it approaches the second lower duct support piece 10.

  The wing portions 7 and 8 include first and second lower duct support piece engaging portions 11 and 12 which are engaged with the first and second lower duct support pieces 9 and 10 at the lower duct fixing position. Yes.

  An opening 13 for inserting the second lower duct support piece 10 is provided between the first and second lower duct support piece engaging portions 11 and 12.

  The first lower duct support piece engaging portion 11 is formed longer in the front-rear direction than the second lower duct support piece engaging portion 12, similarly to the first lower duct support piece engaging portion 9.

  The second lower duct support piece engaging portion 11 is arranged so that the inner side surface 11a of the first lower duct support piece engaging portion 11 is parallel to the inner side surface 9a of the first lower duct support piece 9. It is formed in the inclined surface which becomes wide as it approaches 12.

  As shown in FIGS. 5 and 7, at the position where the lower duct 3 is fixed to the upper duct 2, the first and second lower ducts are placed on the first and second lower duct support pieces 9 and 10. The support piece engaging portions 11 and 12 are engaged, and the lower duct 3 is supported by the upper duct 2 at four locations. In particular, the length L1 of the overlapping region of the first lower duct support piece 9 and the first lower duct support piece engaging portion 11 is equal to the second lower duct support piece 10 and the second lower duct support piece engaging portion. Since it becomes longer than the length L2 of the 12 overlapping regions, the back end side of the lower duct 3 can be reliably supported over a wide area in a long region.

  From the fixed position of the lower duct 3 shown in FIGS. 5 and 7, the lower duct 3 is slid in the direction of arrow A toward the opening 101a of the housing 101, and as shown in FIG. When the position of the second lower duct support piece 10 is matched, the first and second lower duct support piece engaging portions 11 and 12 and the first and second lower duct support piece 9 and 10 is disengaged and the lower duct 3 can be removed from the upper duct 2.

  As shown in FIG. 6, the upper duct 2 is formed by bending a metal plate punched into a predetermined shape, and is attached to the housing 1 with screws using the screw holes 14.

  The first and second lower duct support pieces 9 and 10 are formed by cutting and raising part of the upper duct 2, and the first and second lower duct support pieces 9 and 10 are disposed between the first duct 1 and the lower duct 3. A step portion 15 into which the second lower duct support piece engaging portions 11 and 12 are inserted is formed.

  The lower duct 3 has a screw receiving piece 16 for screwing the lower duct 3 to the lower surface of the upper duct 2 on the rear end side (side facing the opening 101a of the casing 101) in the insertion direction to the casing 101. I have.

  The lower duct 3 is formed of a metal plate, and includes substantially V-shaped bottom surfaces 3a and 3b, and cooling air from an obliquely lower position is supplied to the upper upper duct 2 through an opening 3c provided on one bottom surface 3b. It comes to send to.

  Next, the usage method of the said blower duct 1 is demonstrated. First, the upper duct 2 is inserted into the housing 101 and fixed with screws or the like. Next, the lower duct 3 is inserted into the housing 101 so as to be along the lower portion of the upper duct 2.

  Then, as shown in FIG. 8, when the position of the opening 13 and the position of the second lower duct support piece 10 are matched and the lower duct 3 is pushed up, the first and second lower duct support piece engagements are performed. The upper surfaces of the portions 11 and 12 come into contact with the bottom plate 2 a of the upper duct 2, and the first and second lower duct support piece engaging portions 11 and 12 can be inserted into the step portion 15.

  Therefore, when the lower duct 3 is slid toward the back end side (in the direction of arrow B in FIG. 8) of the housing 101 toward the lower duct fixing position, as shown in FIG. The lower duct support piece engaging portions 11 and 12 engage with the first and second lower duct support pieces 9 and 10 on the left and right sides of the upper duct 2, and the lower duct 3 is connected to the upper duct 2. It will be in the state supported by four places. At this time, since the inner side surface 9a of the first lower duct support piece 9 and the inner side surface 11a of the first lower duct support piece engaging portion 11 are formed on the inclined surface, compared to the sliding amount of the lower duct 3, The amount of overlap between the first lower duct support piece 9 and the first lower duct support piece engaging portion 11 can be increased.

  Next, by screwing the screw receiving piece 16 of the lower duct 3 facing the opening 101a side of the housing 101 to the lower surface of the upper duct 2, the lower duct 3 is positioned and fixed at a fixed position.

  The removal of the lower duct 3 from the upper duct 2 is performed in the reverse procedure to the above mounting operation. That is, first, the screw receiving piece 16 is unscrewed, and the lower duct 3 is slid to the opening 101a side (in the direction of arrow A in FIG. 7) of the housing 101, and the position of the opening 13 as shown in FIG. When the position of the second lower duct support piece 10 is matched, the first and second lower duct support piece engaging portions 11 and 12 of the lower duct 3 and the first and first of the upper duct 2 are arranged. 2, the lower duct support pieces 9 and 10 are disengaged, and the lower duct 3 can be removed from the upper duct 2.

DESCRIPTION OF SYMBOLS 1 ... Blower duct 2 ... Upper duct 3 ... Lower duct 4 ... Slide guide rail part 5,6 ... Left-right paired guide main-body part 5,6
7, 8 ... Pair of left and right wings 9 ... First lower duct support piece 10 ... Second lower duct support piece 11 ... First lower duct support piece engagement portion 12 ... Third lower duct support piece engagement Part 13 ... Opening part 14 ... Screw hole 15 ... Step part 16 ... Screw receiving piece 101 ... Housing 101a ... Opening part

Claims (5)

A blower duct of a semiconductor power converter that guides cooling air introduced into a housing by a blower to a semiconductor element,
The blower duct includes an upper duct, a lower duct, and a slide guide rail portion that detachably attaches the lower duct to the lower surface of the upper duct.
The slide guide rail part is provided on the left and right side parts parallel to the insertion direction to the housing at the lower part of the upper duct and supports the lower duct so as to be slidable with the lower surface of the upper duct. And left and right wings that are provided on the left and right sides of the lower duct and are slidably inserted between the lower surface of the upper duct and the lower duct support piece,
The guide main body includes a pair of front and rear first and second lower duct support pieces arranged with a predetermined gap in the front-rear direction,
The wing portion engages on the first and second lower duct support pieces at the lower duct fixing position to support the lower duct, and engages with the first and second lower duct support pieces at the lower duct removal position. A blower duct for a semiconductor power converter, comprising first and second lower duct support piece engaging portions that allow the lower duct to be detached from the upper duct. The wing includes an opening into which the second lower duct support piece can be inserted between the first lower duct support piece engaging portion and the second lower duct support piece engaging portion. By positioning the second lower duct support piece on the part, the first and second lower duct support piece and the first and second lower duct support piece engaging parts are aligned with each other so as not to engage with each other. The blower duct of the semiconductor power conversion device according to claim 1, wherein the blower duct is made possible. The first lower duct support piece is longer in the front-rear direction than the second lower duct support piece, and the inner surface is formed in an inclined surface that becomes narrower as it approaches the second lower duct support piece. The first lower duct support piece engaging portion that engages with the first lower duct support piece is longer in the front-rear direction than the second lower duct support piece engaging portion, and the inner side surface is 2. The inclined surface parallel to the inclined surface of the first lower duct support piece is formed so as to become wider as approaching the second lower duct support piece engaging portion. Or the blower duct of the semiconductor power converter device of 2. The said lower duct is equipped with the screw receiving piece which screws a lower duct to the lower surface of an upper duct in the rear end side of the insertion direction to a housing | casing, The Claim 1 characterized by the above-mentioned. Blower duct for semiconductor power converter. The blower duct of the semiconductor power converter according to any one of claims 1 to 4, wherein the first and second lower duct support pieces are formed by cutting and raising part of the upper duct.

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