JP2017011201A - Power converter - Google Patents

Abstract

A noise filter element is held without complicating the mounting work.
A housing space inside an apparatus housing is partitioned by partition walls, circuit boards, 21, and 23 are disposed in the housing spaces, and a central hole 30a of a ferrite core 30 having a cylindrical shape is formed. A power conversion device in which circuit boards 21, 22, and 23 disposed in respective housing spaces are electrically connected to each other by cables C passing therethrough, and the ferrite core 30 with the central hole 30a communicating with the outside. 30, and engaging means 43 and 50 that are engaged with each other when the housing case 40 is engaged with the partition wall 12 </ b> C between the housing case 40 and the partition wall 12 </ b> C. Was provided.
[Selection] Figure 8

Description

  The present invention relates to a power conversion device having two housing spaces partitioned by a partition wall inside a device housing and electrically connecting circuit boards arranged in the respective housing spaces to each other by a cable. is there.

  In some electrical conversion devices, a housing space inside the device housing is partitioned by a partition wall, and circuit boards arranged in the respective housing spaces are connected by cables. In a power conversion device in which a main board on which a rectifier circuit, a smoothing circuit, and an inverter circuit are mounted, a power board that generates a power supply voltage, and a control board that controls the inverter circuit are separately provided, for example, the main board and the power board The housing space for housing the housing and the housing space for housing the control board are partitioned by a partition wall, and the power supply board and the control board are connected by a cable. According to this type of power conversion device, since the space insulation distance between the power supply board and the control board can be earned by the partition wall, the apparatus housing can be downsized.

  In this type of power conversion device, electromagnetic noise generated during operation causes a malfunction of the control circuit. For this reason, in many power conversion devices, a noise filter element such as a ferrite core or an electromagnetic coil is disposed in a housing space inside the device housing, and a cable is disposed so as to pass through the center hole of the noise filter element. Thus, the influence of electromagnetic noise is prevented (see, for example, Patent Document 1).

JP-A-5-136593

  Patent Document 1 describes a method in which the above-described noise filter element is bonded to an apparatus housing by an adhesive. As another method, a method of holding the device casing using a so-called tie band is often applied. However, in the method using an adhesive, the noise filter element must be held by hand until it is cured after the adhesive is applied. Further, in the method using the binding band, it is necessary to wind and tighten the binding band so as to pass between the noise filter element and the apparatus housing, and to cut the surplus portion with a cutting tool. Therefore, these methods are not necessarily preferable in consideration of workability.

  An object of this invention is to provide the power converter device which can hold | maintain a noise filter element, without complicating attachment work in view of the said situation.

  In order to achieve the above object, a power conversion device according to the present invention divides a housing space inside a device housing by a partition wall, disposes a circuit board in each housing space, and forms a cylindrical noise filter element. A power conversion device in which circuit boards arranged in respective housing spaces are electrically connected to each other by cables passing through the center hole of the noise filter element, wherein the noise filter element is in a state where the center hole of the noise filter element communicates with the outside A housing case for housing the housing, and provided between the housing case and the partition wall are engaging means that engage with each other when the housing case is engaged with the partition wall. Features.

  Moreover, the present invention is the above-described power conversion device, wherein the housing case has a peripheral wall portion covering a peripheral surface of the noise filter element and an end wall portion covering one end surface of the noise filter element, The other end surface of the element is in contact with the surface of the partition wall via the end surface of the peripheral wall portion with the other end surface facing the partition wall, and the engaging means is located on the outer peripheral side from the peripheral wall portion of the housing case. A plurality of protruding engagement pieces, and a plurality of engagement receiving portions formed around the storage case in the partition wall, wherein the engagement pieces include the storage case on the partition wall. A flat plate disposed along the surface of the partition wall when contacted, and the engagement receiving portion of the peripheral wall portion in a state where the housing case is in contact with the partition wall. Centered around the center axis A cover wall portion that covers the surface of the engaging piece when the housing case is rotated to rotate, and the cover wall portion moves the housing case in a direction away from the partition wall. It is characterized by preventing.

  Further, according to the present invention, in the above-described power conversion device, a protrusion is formed on a part of the surface of the engagement piece portion, and the housing case is rotated on the cover wall portion of the engagement receiving portion. A slit having a width narrower than that of the protrusion is formed at a position on the movement trajectory of the protrusion, and an accommodation notch having a size capable of accommodating the protrusion is provided at the end of the slit. It is characterized by that.

  Further, the present invention is the above-described power conversion device, wherein the engagement piece portion includes a main body base portion extending in a radial direction around an axis center of the peripheral wall portion, and an extending end portion of the main body base portion to the peripheral wall. An insertion portion extending in an arc shape along the portion, and the engagement receiving portion is a side wall portion facing both side surfaces of the insertion portion when the cover wall portion covers the surface of the insertion portion. When the cover wall portion covers the insertion portion, the side surface of the insertion portion and the side wall portion of the engagement receiving portion are pressed against each other.

  Further, according to the present invention, in the above-described power conversion device, the engagement claw that engages when the noise filter element is accommodated in the accommodation case and prevents the noise filter element from falling off from the opening at the other end. A feature is provided.

  Further, according to the present invention, in the above-described power conversion device, the housing case is provided with a reinforcing rib that connects the peripheral wall portion and the engagement piece portion.

  According to the present invention, when the housing case housing the noise filter element is brought into contact with the partition wall and the partition wall is engaged in this state, the housing case and the partition wall of the apparatus housing are engaged by the engaging means. Therefore, the noise filter element can be held without complicating the installation work.

FIG. 1 is a cross-sectional side view of a power conversion device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view showing a main part of the power conversion device shown in FIG. 1 in an exploded manner from the front side. FIG. 3 is an exploded perspective view showing the main part of the power conversion device shown in FIG. 1 in an exploded manner from the rear side. 4A and 4B show a housing case applied to the power conversion device shown in FIG. 1, wherein FIG. 4A is a perspective view seen from the closed end face side, and FIG. 4B is a view seen from the closed end face side. FIG. 5 shows a housing case and a noise filter element applied to the power conversion device shown in FIG. 1, (a) is an exploded perspective view seen from the open end face side, and (b) is a noise in the housing case. It is the perspective view which looked at the state which accommodated the filter element from the open end surface side. FIG. 6 shows a procedure for holding the noise filter element on the partition wall in the power converter shown in FIG. 1, (a) is a cross-sectional view before the noise filter element is housed in the housing case, and (b). FIG. 5 is a cross-sectional view of a state in which the noise filter element is housed in the housing case, and (c) is a cross-sectional view of the state in which the housing case housing the noise filter element is held by the partition wall. FIG. 7 shows a procedure for holding the noise filter element on the partition wall in the power converter shown in FIG. 1, (a) is a diagram showing an engagement receiving portion provided on the partition wall, and (b) is a diagram showing The figure of the state which made the storage case contact | abut on a partition wall, (c) is a figure of the state which engaged the engagement case and engaged the engagement means. FIG. 8 shows a state in which the noise filter element is attached to the partition wall in the power conversion device shown in FIG. 1, wherein (a) is a perspective view before engaging means, and (b) is engaged. It is a perspective view of the state which engaged the means. FIG. 9 shows the main part of the engaging means applied to the power conversion device shown in FIG. 1, (a) is a cutaway view before engaging the engaging means, and (b) shows the engaging means. It is a fracture view of the state which made it engage and pressed the insertion part of an engagement piece part, and the side wall part of an engagement receiving part mutually.

  Hereinafter, preferred embodiments of a power converter according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a power conversion apparatus according to an embodiment of the present invention. The power converter illustrated here outputs AC power to a load such as an induction motor or a synchronous motor, and includes a drive board 21, a capacitor board 22, and a control board 23 inside the apparatus housing 10. The apparatus housing 10 includes a frame body 11, a side cover 12, a bottom cover 13, and a front cover 14 that are formed of resin, sheet metal, aluminum die casting, or the like.

  Although not explicitly shown in the drawing, the frame body 11 has a hollow box shape, and includes a cooling unit such as a heat sink and a cooling fan inside. The heat sink cools an IGBT (Insulated Gate Bipolar Transistor) module 21A mounted on a drive board 21 described later, and the cooling fan ventilates the heat sink.

  As shown in FIGS. 2 and 3, the side cover 12 is provided so as to surround the upper surface and both side surfaces in the front region of the frame body 11. A large number of air holes 12a are provided in the upper wall portion 12A and the left and right side wall portions 12B of the side cover 12, respectively. The side cover 12 is provided with a partition wall 12C in an accommodation space surrounded by the upper wall portion 12A and the left and right side wall portions 12B. The partition wall 12C is provided so as to be parallel to the front surface of the frame body 11, and divides the accommodation space surrounded by the upper wall portion 12A and the left and right side wall portions 12B of the side cover 12 in the front-rear direction.

  The bottom cover 13 is provided so as to cover the lower surface of the side cover 12. The bottom cover 13 is also provided with a vent (not shown). The front cover 14 has a size that covers the entire front surface of the side cover 12, and is disposed so as to be detachable from the side cover 12. The front cover 14 becomes the front surface of the power conversion device when attached to the vertical surface B such as a distribution board via the frame body 11. Although not explicitly shown in the figure, the front cover 14 is provided with interfaces such as an operation unit and a display unit.

  The drive board 21 constitutes an inverter circuit, and is attached to the frame body 11 via a boss portion 11 a provided on the front surface of the frame body 11. An IGBT module 21 </ b> A is mounted on the drive board 21 on the mounting surface facing the front surface of the frame body 11. The surface of the IGBT module 21 </ b> A that faces the front surface of the frame body 11 is in contact with the front surface of the frame body 11. The drive board 21 is also configured with a power supply circuit for generating various power supply voltages. The capacitor substrate 22 constitutes a rectifier circuit and a smoothing circuit, and is attached to the frame body 11 at a position in front of the drive substrate 21. On this capacitor substrate 22, electronic components such as a capacitor 22A and a transformer 22B are mounted on the front mounting surface. The control board 23 is driven by the power supply voltage supplied from the power supply circuit and controls the inverter circuit configured on the drive board 21 and is attached to the front surface of the partition wall 12C. The drive board 21 and the control board 23 are electrically connected by a cable C.

  In this power converter, a ferrite core (noise filter element) 30 is attached to the partition wall 12C. The ferrite core 30 has a cylindrical shape having a center hole 30a, and is held on the partition wall 12C via the housing case 40. As shown in FIGS. 4 to 7, the housing case 40 has a peripheral wall portion 41 that covers the periphery of the ferrite core 30 and an end wall portion 42 that covers one end surface of the ferrite core 30. Molded. As the peripheral wall portion 41, one having an arc length (a central angle of about 225 °) that covers the majority of the peripheral surface of the ferrite core 30 is applied. The end wall portion 42 has a flat plate shape and has an insertion hole 42a at the center. The housing case 40 is provided with three engagement piece portions 43 on the outer peripheral surface of the peripheral wall portion 41, and two elastic engagement claw portions (engagement claw portions) 44 on the end wall portion 42. .

  The engaging piece portion 43 has a main body base portion 43a, an insertion portion 43b, and a reinforcing rib 43c. The main body base portion 43a extends in the radial direction around the axis of the peripheral wall portion 41, and the insertion portion 43b extends in an arc shape along the peripheral wall portion 41 from the extending end portion of the main body base portion 43a. is there. The main body base portion 43 a and the insertion portion 43 b each have a flat plate shape extending so as to be parallel to the end wall portion 42. The position where the engagement piece portion 43 is provided is a position separated from the end surface without the end wall portion 42 (hereinafter referred to as the open end surface 41a) in the peripheral wall portion 41 by a distance corresponding to the plate thickness of the engagement piece portion 43. In the present embodiment, as shown in FIG. 4B, when viewed from the end surface having the end wall portion 42 in the peripheral wall portion 41 (hereinafter referred to as the closed end surface 41b), the extended end portion of the main body base portion 43a Each of the engaging piece portions 43 is provided so that the insertion portion 43b extends in the clockwise direction. The reinforcing rib 43c is a thin plate member interposed between the peripheral wall portion 41 and the main body base portion 43a. In the present embodiment, the reinforcing rib 43c extending so as to curve outward from the peripheral wall portion 41 is applied.

  In the engagement piece portions 43 positioned on both sides of the three engagement piece portions 43, protrusions 45 are formed at the distal ends of the insertion portions 43b. The protrusion 45 is a protrusion having a spherical tip, and is provided at a position that bisects the width of the insertion portion 43b on the surface exposed when the peripheral wall portion 41 is viewed from the closed end surface 41b.

  The elastic engagement claw portion 44 includes a claw base portion 44a that protrudes along the axial direction of the peripheral wall portion 41 from a portion around the insertion hole 42a on the inner surface of the end wall portion 42, and a protruding end portion of the claw base portion 44a. It has a hook part 44b which protrudes toward the peripheral wall part 41 from the side surface which mutually separated. The two elastic engagement claws 44 are set so that the distance between the side surfaces provided with the hooks 44b is slightly smaller than the inner diameter of the center hole 30a of the ferrite core 30. The hook portion 44 b is set so that the distance between the hook portion 44 b and the end wall portion 42 of the housing case 40 is slightly larger than the height along the axial direction of the ferrite core 30.

  In the housing case 40 configured as described above, the two elastic engagement claws 44 can be inserted into the center hole 30a of the ferrite core 30 if the two elastic engagement claws 44 are appropriately elastically deformed. When the end face of the ferrite core 30 is protruded from the inner surface of the end wall portion 42, the hook portion 44b is connected to the center hole 30a of the ferrite core 30 as shown in FIGS. 5B and 6B. The two elastic engagement claws 44 are restored to the original state by passing through, and the respective hook portions 44b face the end face of the ferrite core 30. Therefore, even when the open end surface 41a of the storage case 40 is directed downward, the hook portion 44b is engaged with the end surface of the ferrite core 30, and the ferrite core 30 is not accidentally dropped from the storage case 40. . In this state, the central hole 30a opened to one end face of the ferrite core 30 through the open end face 41a is exposed to the outside, and the other end of the ferrite core 30 is inserted through the insertion hole 42a of the end wall portion 42. The center hole 30a that opens to the end face of this is exposed to the outside. Note that the ferrite core 30 can be taken out of the housing case 40 by elastically deforming the elastic engagement claw portions 44 in directions close to each other.

  On the other hand, an insertion notch 12D is provided on the partition wall 12C that holds the housing case 40. The insertion notch 12D is an opening that penetrates the partition wall 12C. In the present embodiment, an insertion notch 12D having a circular hole 12Da having a circular opening and a rectangular hole 12Db having a rectangular opening and communicating with the circular hole 12Da. Is formed at the corner located above the partition wall 12C. The inner diameter of the circular hole portion 12 </ b> Da is configured to be slightly smaller than the inner diameter of the peripheral wall portion 41 in the housing case 40. As shown in FIGS. 3 and 6B and FIG. 7A, the rear surface of the partition wall 12C facing the front surface of the frame body 11 has an opening edge of the circular hole 12Da in the insertion notch 12D. The core support wall 12E is provided, and three engagement receiving portions 50 are provided at positions on the outer periphery of the core support wall 12E.

  The core support wall 12E is a cylindrical portion that protrudes toward the front surface of the frame body 11 from the opening edge of the circular hole portion 12Da. The outer diameter of the core support wall 12E is set to a dimension that allows the core support wall 12E to be slidably fitted into the housing case 40.

  The engagement receiving portion 50 constitutes an engagement means together with the engagement piece portion 43 of the housing case 40. That is, the engagement receiving portion 50 engages the housing case 40 so that the housing case 40 rotates about the central axis of the circumferential wall portion 41 with the opening end surface of the circumferential wall portion 41 of the housing case 40 in contact with the rear surface of the partition wall 12C. When the combined operation is performed, the engaging piece portion 43 is engaged, and the housing case 40 is prevented from moving in a direction away from the partition wall 12C. In the present embodiment, the engagement receiving portion 50 is configured to include the reference wall portion 51, the outer peripheral side wall portion 52, the inner peripheral side wall portion 53, and the cover wall portion 54, respectively.

  The reference wall portion 51 is a portion extending in the radial direction around the circular hole portion 12Da. The outer peripheral side wall portion 52 and the inner peripheral side wall portion 53 are provided in an arc shape having the same center as the core support wall 12E of the circular hole portion 12Da. When the partition wall 12C is viewed from the rear surface, each reference wall portion 51 is provided. Extends counterclockwise from. Between the outer peripheral side wall part 52 and the inner peripheral side wall part 53, the space | interval which can insert the insertion part 43b of the engagement piece part 43 is ensured. As is clear from FIGS. 7A and 8A, the outer peripheral side wall 52 of the engagement receiving portion 50 is set to have a larger arc length than the inner peripheral side wall 53. Specifically, when the partition wall 12 </ b> C is viewed from the rear surface, the outer peripheral side wall 52 is formed to extend in the counterclockwise direction with respect to the inner peripheral side wall 53. The arc length of the outer peripheral side wall portion 52 is substantially equal to the insertion portion 43 b of the engagement piece portion 43 provided in the housing case 40. The protruding heights of the reference wall 51, the outer peripheral side wall 52, and the inner peripheral side wall 53 from the partition wall 12C are the same, and as shown in FIG. The position is set so as to be substantially the same as the surface of the engagement piece 43 when brought into contact with the rear surface of the partition wall 12C. In FIG. 8, for the sake of convenience, the reinforcing rib 23 of the engaging piece 43 is omitted.

  The cover wall portion 54 is a flat plate portion provided so as to cover the protruding end surfaces of the reference wall portion 51, the outer peripheral side wall portion 52, and the inner peripheral side wall portion 53. As shown in FIG. 7A, each cover wall portion 54 is formed to have a dimension that covers from the reference wall portion 51 to the extending end portion of the inner peripheral side wall portion 53, and the partition wall 12C is formed from the rear surface. When viewed, an engagement receiving portion 50 is formed in which an end portion (hereinafter referred to as an open end portion) extending in a counterclockwise direction from the reference wall portion 51 is opened.

  The engagement receiving portions 50 located on both sides of the three engagement receiving portions 50 are provided with a slit 55 and a housing cutout portion 56 in the cover wall portion 54, and the central engagement receiving portion 50 has an outer periphery. A pressing surface 57 is provided on the side wall 52 and the inner peripheral side wall 53. The slit 55 is a groove-shaped notch that is narrower than the protrusion 45 provided on the engaging piece 43 of the housing case 40. Each of the slits 55 is formed along a circular arc having the same center as that of the outer peripheral side wall 52 from the portion located at the open end of the cover wall 54, and ends before reaching the reference wall 51. The accommodation notch 56 is a circular notch formed at the end of the slit 55. The inner diameter of the housing notch 56 is formed to a size that can accommodate the protrusion 45 provided on the engagement piece 43. The individual accommodation notches 56 are formed when the insertion portion 43b provided with the protrusion 45 in the engagement piece 43 of the accommodation case 40 is inserted between the outer peripheral side wall 52 and the inner peripheral side wall 53 from the open end. The protrusion 45 is formed before the distal end of the insertion portion 43 b reaches the reference wall portion 51. As shown in FIG. 7A and FIG. 9A, the pressing surface 57 has the reference inner walls facing each other of the outer peripheral side wall portion 52 and the inner peripheral side wall portion 53 in the central engagement receiving portion 50. It is configured to be close to each other as it approaches the portion 51.

  In order to hold the ferrite core 30 on the partition wall 12C by the engaging means 43, 50 configured as described above, the ferrite core 30 is accommodated in the accommodating case 40 as shown in FIG. The open end surface 41a of the case 40 is opposed to the rear surface of the partition wall 12C.

  Next, as shown in FIG. 7B and FIG. 8A, the engagement pieces of the storage case 40 are positioned in a counterclockwise position with respect to the individual engagement receiving portions 50 provided on the partition wall 12C. If each of the portions 43 is arranged and the end surface of the peripheral wall portion 41 is brought into contact with the rear surface of the partition wall 12C, the core support wall 12E of the partition wall 12C is fitted into the peripheral wall portion 41, and each insertion portion The outer peripheral surface of the front end portion of 43b is brought into contact with the outer peripheral side wall portion 52, so that the housing case 40 can be positioned with respect to the partition wall 12C.

  From this state, when the housing case 40 is engaged so as to rotate clockwise about the central axis of the peripheral wall portion 41, the housing case 40 is brought into contact with the housing case 40 as shown in FIGS. 7 (c) and 8 (b). The insertion portions 43b of the provided engagement piece portions 43 are respectively inserted into the engagement receiving portions 50 provided on the partition wall 12C. Here, before the projection 45 provided on the insertion portion 43b reaches the accommodation cutout portion 56 of the engagement receiving portion 50, the projection 45 cannot be accommodated in the narrow slit 55, and the engagement is not possible. Since the protrusion 45 is pressed against the cover wall portion 54 of the receiving portion 50, the distal end portion of the insertion portion 43b is elastically deformed so as to be close to the partition wall 12C.

  When the rotation of the storage case 40 proceeds from this state and the protrusion 45 reaches the storage notch 56, the protrusion 45 is stored in the storage notch 56, so that the insertion portion 43b returns to its original shape. As a result, the cover wall portion 54 is brought into contact with the cover wall portion 54, and movement of the insertion portion 43b from the engagement receiving portion 50 in the deviation direction is restricted. That is, the engagement piece portion 43 of the storage case 40 is engaged with the engagement receiving portion 50 of the partition wall 12 </ b> C, and the insertion portion 43 b is covered with the cover wall portion 54. As a result, the storage case 40 is prevented from moving away from the partition wall 12C, and the ferrite core 30 stored in the storage case 40 is attached to the partition wall 12C.

  Furthermore, as shown in FIG. 9B, between the engagement piece portion 43 and the engagement receiving portion 50 in the center, the distal end portion of the insertion portion 43b is the pressing surface 57 and the inner periphery of the outer peripheral side wall portion 52. It will be in the state pressed by the pressing surface 57 of the side wall part 53. FIG. Therefore, the housing case 40 receives a reaction force from the pressing surface 57 so as to rotate counterclockwise in FIG. 7C, and the protrusion 45 is pressed against the edge of the housing notch 56. It becomes a state. Thereby, even when the apparatus housing 10 vibrates during operation, there is no possibility that the housing case 40 will rattle against the partition wall 12C.

  According to this power converter, the cable C is wired so as to pass through the central hole 30a of the ferrite core 30, and the drive board 21, the capacitor board 22, and the drive board 21 are electrically connected by the cable C. Thus, the influence of electromagnetic noise generated during operation is reduced, and problems such as malfunction of the control circuit can be prevented.

  Thus, in the above-described power conversion device, the open end surface 41a of the housing case 40 housing the ferrite core 30 is brought into contact with the partition wall 12C, and in this state, the partition wall 12C can be rotated around the axis of the peripheral wall portion 41. For example, the housing case 40 and the partition wall 12C of the apparatus housing 10 are engaged with each other by the engaging means 43 and 50, so that the ferrite core 30 can be held on the partition wall 12C without complicating the mounting work. It becomes possible.

  Reinforcing ribs 43c are provided on the engaging piece 43 from which the peripheral wall 41 of the housing case 40 projects. Therefore, even when the engaging operation is performed, there is no possibility that the main body base portion 43a of the engaging piece portion 43 is deformed or damaged, and the ferrite core 30 can be reliably held on the partition wall 12C.

  Further, since the housing case 40 is formed separately from the side cover 12, the dimensional accuracy of the housing case 40 can be ensured regardless of the size of the side cover 12.

  In the above-described embodiment, three engagement piece portions 43 and three engagement receiving portions 50 are provided, but the number of the engagement piece portions 43 and the engagement receiving portions 50 is not necessarily limited to three. It does not have to be, and any number may be used as long as it is plural.

  In the above-described embodiment, the ferrite core 30 is exemplified as the noise filter element. However, other elements such as an electromagnetic coil may be used.

DESCRIPTION OF SYMBOLS 10 Apparatus housing | casing 12C Partition wall 12E Core support wall 21 Drive board 22 Capacitor board 23 Control board 30 Ferrite core 30a Center hole 40 Housing case 41 Perimeter wall part 41a Open end surface 42 End wall part 42a Insertion hole 43 Engagement part 43a Main body base 43b Insertion part 43c Reinforcement rib 44 Elastic engagement claw part 44a Claw base part 44b Hook part 45 Projection part 50 Engagement receiving part 52 Outer peripheral side wall part 53 Inner peripheral side wall part 54 Cover wall part 55 Slit 56 Accommodating notch part 57 Press surface C Cable

Claims (6)

The housing spaces inside the device housing are partitioned by partition walls, circuit boards are disposed in the respective housing spaces, and the housing spaces are disposed in the respective housing spaces by cables passing through the central hole of the cylindrical noise filter element. A power conversion device in which circuit boards are electrically connected to each other,
A housing case for housing the noise filter element in a state where a central hole of the noise filter element communicates with the outside; and the housing case is engaged with the partition wall between the housing case and the partition wall An electric power converter characterized in that engagement means are provided that are engaged with each other when operated. The housing case has a peripheral wall portion covering the peripheral surface of the noise filter element and an end wall portion covering one end surface of the noise filter element, and the other end surface of the noise filter element faces the partition wall. In contact with the surface of the partition wall through the end surface of the peripheral wall portion,
The engaging means includes a plurality of engaging piece portions protruding from the peripheral wall portion of the housing case to the outer peripheral side, and a plurality of engaging receiving portions formed in a portion around the housing case on the partition wall. ,
The engaging piece portion is a flat plate disposed along the surface of the partition wall when the housing case is brought into contact with the partition wall.
The engagement receiving portion is configured to move the engagement piece portion when the engagement case is operated to rotate the housing case around the central axis of the peripheral wall portion in a state where the housing case is in contact with the partition wall. The power conversion device according to claim 1, further comprising a cover wall portion covering a surface, wherein the cover wall portion prevents movement of the housing case in a direction away from the partition wall. A protrusion is formed on a part of the surface of the engagement piece,
In the cover wall portion of the engagement receiving portion, a slit having a width narrower than that of the protrusion is formed at a position on the movement locus of the protrusion when the housing case rotates, and the end portion of the slit The power conversion device according to claim 2, further comprising an accommodation notch having a size capable of accommodating the protrusion. The engagement piece portion includes a main body base portion extending in a radial direction around the axis of the peripheral wall portion, and an insertion portion extending in an arc shape from the extending end portion of the main body base portion along the peripheral wall portion. Have
The engagement receiving portion has side wall portions that face both side surfaces of the insertion portion when the cover wall portion covers the surface of the insertion portion,
The power conversion device according to claim 2, wherein when the cover wall portion covers the insertion portion, the side surface of the insertion portion and the side wall portion of the engagement receiving portion are pressed against each other.   The engagement case is provided with an engaging claw portion that engages when the noise filter element is accommodated and prevents the noise filter element from falling off from the opening at the other end. The power converter described.   The power conversion device according to claim 2, wherein the housing case is provided with a reinforcing rib that connects between the peripheral wall portion and the engagement piece portion.

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