JP6682831B2 - Power converter - Google Patents

Description

  The present invention relates to a power conversion device.

  2. Description of the Related Art Conventionally, a power conversion device has been used in controlling elevators, air conditioners, and the like. In this type of power conversion device, a power module, which is a main component, is housed in a control chamber of the device body, and a heat sink for cooling this power module is provided. The heat sink is configured to include a frame body that forms the main body of the device.

  In such a power conversion device, the circuit part provided on the front side of the device body is attached to the device body in order to reduce the influence of heat radiation from the heat sink provided on the rear side of the device body. A method has been proposed in which the device main body is attached to a wall surface via a plate and the heat sink is provided as a wall-outside structure (see Patent Document 1). In Patent Document 1, a heat sink is provided at a rear portion of a device body having a circuit portion at a front portion, a series of grooves is provided at a boundary portion between the circuit portion and the heat sink on an outer periphery of the device body, and the mounting plate is divided into each groove. It describes a configuration of a power conversion device in which a mounting plate is attached to the device main body by inserting the parts and screwing each other, and the mounting plate is attached to a wall surface so that the heat sink goes out.

JP, 2004-015920, A

  However, the above-mentioned Patent Document 1 has the following problems. That is, according to the technique described in Patent Document 1, the divided portions of the mounting plate are inserted into the grooves, and the divided portions are screwed together. In this case, since the mounting plate is fixed to the apparatus main body only by fitting the respective divided portions to the groove, there is a problem that the installation strength of the mounting plate to the apparatus main body becomes low. Further, since the divided portions of the mounting plate are screwed to each other, it is necessary to bend the mounting plate at the screw-fastened portions of the divided portions which overlap each other. Therefore, when the power conversion device is installed on a wall plate such as a mounting panel or a panel while exposing the frame body that will be the heat sink in an environment with a large amount of water such as dew condensation, the water content does not appear on the housing body side where the circuit is stored. However, there was a problem that the possibility of infiltration of the water would be extremely high.

  The present invention has been made in view of the above, and an object thereof is to prevent infiltration of moisture from the outside even when the frame body is installed in a state where it is exposed to an environment with a large amount of moisture. It is an object of the present invention to provide a power conversion device that can be prevented and can suppress the influence of heat on the circuit portion of the housing body due to heat dissipation of the frame body.

  In order to solve the above-mentioned problems and achieve the above-mentioned object, the power conversion device according to the present invention has a storage main body in which a semiconductor element constituting a power conversion circuit is stored, and is attached to a rear surface of the storage main body. A frame body in which a cooling body of a semiconductor element is housed, and a mounting plate made up of a plurality of divided mounting plates mounted in a connecting portion between the frame body and the housing body are provided, and the frame body is formed from an opening formed in the mounting wall. Is a power conversion device installed on a mounting wall via a mounting plate in a state where the housing is exposed to the outside, and a housing portion having a contact surface facing the mounting wall at a connecting portion between the frame body and the housing body. Is provided in a circumferential shape, and the mounting plate is in contact with the contact surface in the accommodating portion and is screwed and fixed to the accommodating main body or the frame body.

  The power converter according to the present invention is characterized in that, in the above-mentioned invention, the contact surface is a side surface inside a groove formed in the connecting portion.

  The power converter according to the present invention is characterized in that, in the above-mentioned invention, the contact surface is a side surface of the step in which the housing main body is protruded with respect to the frame body at the connecting portion.

  The power converter according to the present invention is characterized in that, in the above-mentioned invention, each of the plurality of split mounting plates is provided with a mounting hole configured to be screwed into a mounting wall by screwing.

  The power conversion device according to the present invention is characterized in that, in the above-mentioned invention, the depth of the contact surface portion of the housing portion is 1.0 mm or more and 5.0 mm or less.

  According to the power converter of the present invention, the power converter is provided with a circumferential accommodating portion at the connecting portion between the accommodating main body and the frame body, and the end surfaces of the plurality of split mounting plates abutting against the accommodating portion are brought into contact with each other. Even if the frame body is installed in a state where the frame body is exposed to a water-rich environment by fixing the split mounting plate to the storage main body or the frame body with screws while closely contacting each other It is possible to prevent moisture from entering from the outside and suppress the influence of heat on the circuit portion of the housing main body due to heat dissipation of the frame body.

FIG. 1 is a perspective view showing a state in which a mounting plate according to an embodiment of the present invention is provided in a power conversion device. FIG. 2 is an exploded perspective view showing a mounting plate and an overall configuration of a power conversion device according to an embodiment of the present invention. FIG. 3 is a perspective view showing a state in which the power conversion device according to the embodiment of the present invention is installed. FIG. 4 is a partial cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is a side view of the power conversion device and the split mounting plate in FIG. 2 viewed from the lower surface side. FIG. 6 is a side view of the power conversion device and the split mounting plate in FIG. 1 viewed from the lower surface side. FIG. 7 is a partial perspective view showing a cutout portion at a mounting position with a mounting plate in a region Q in FIG. FIG. 8 is a partial perspective view showing the mounting state of the mounting plate in the region R of FIG. FIG. 9 is a partial bottom cross-sectional view showing the lower surface side of the power conversion device for explaining the modified example of the embodiment of the present invention.

  An embodiment of the present invention will be described below with reference to the drawings. In all the drawings of one embodiment below, the same or corresponding parts are designated by the same reference numerals. Further, the present invention is not limited to the embodiment described below.

  First, a power converter according to an embodiment of the present invention will be described. 1, 2, and 3 are a perspective view, an exploded perspective view, and a perspective view of an installed state showing a power conversion device according to this embodiment, respectively. The power conversion device illustrated here includes a device body 1. The front, rear, upper, lower, left, and right in the following description are the front side, the back side, the upper side, the lower side, the left side, when facing the operation panel in a posture in which the apparatus body 1 is erected as shown in FIG. And on the right.

As shown in FIGS. 1, 2, and 3, the apparatus main body 1 includes a frame body 10 and a storage main body 20. The frame body 10 has a rectangular parallelepiped shape having an opening on the upper surface and the lower surface, and is made of, for example, die casting. A cooling fan (not shown) is provided inside the frame body 10 on either the upper surface or the lower surface of the frame body 10. Then, by this cooling fan, the outside air taken in from the lower surface of the frame body 10 as shown by the arrow A ₀ is exhausted to the upper surface side as shown by the arrow A. Then, the outside air drawn into the frame body 10 cools the cooling fins and the like (not shown) housed in the frame body 10. In the cooling of the frame body 10, since the wind force from the cooling fan is strong, dust such as dust from the top surface of the frame body 10 is extremely small, and even if dust is invaded, the cooling fins or the like are not damaged. There is no problem because it is not a device that occurs.

  Further, in the frame body 10, mounting holes 43a, 43b, 44a, 44b for installing the power conversion device on a wall plate 60 such as a board are formed on the upper surface 25 side, and a cutout is formed on the lower surface 24 side. Notch portions 41a, 41b, 42a, 42b are formed. As a result, although not shown in the drawings, a mounting screw (not shown) is passed through the mounting holes 44a, 44b and the cutouts 42a, 42b of the frame body 10 as necessary, so that the wall plate 60 as a mounting wall. The main body 1 of the device can be installed by screwing the main body 1 so that the rear surface of the main body 20 is parallel to the wall plate 60.

  The storage main body 20 has a substantially rectangular parallelepiped shape, a rear opening (not shown) is formed in the rear surface thereof, a semiconductor element that forms a power conversion circuit inside, and a control device that controls the semiconductor element. Is stored. The storage body 20 is connected to the frame body 10 so as to cover the front area of the frame body 10 and is installed side by side. The storage main body 20 forms a storage space as a control room for storing various control devices together with the frame body 10. As described above, the frame body 10 accommodates a cooling body (not shown) such as a cooling fin for cooling the semiconductor element, but the frame body 10 and the cooling body are integrated. May be a separate body.

  Then, as shown in FIG. 2, in the connecting portion between the frame body 10 and the storage main body 20, in the circumferential portion that goes around the right side surface 22, the lower surface 24 side, the left side surface 23 side, and the upper surface 25 side, For example, the accommodating portion 12 including a groove is formed. Then, as shown in FIG. 1, a plate-shaped mounting plate 50 is fitted and provided in the housing portion 12. As shown in FIG. 2, the mounting plate 50 is composed of at least two split mounting plates 51 and 52 which are U-shaped plate members and can be fitted into the housing portion 12. These split mounting plates 51 and 52 are coated after a metal plate made of, for example, stainless steel (SUS), titanium (Ti), or amorphous metal, or any metal such as iron (Fe) is molded into a plate shape. It is composed of a plate material that has been subjected to.

  FIG. 4 is a partial cross-sectional view taken along the line IV-IV (cross section perpendicular to the front surface 21) in FIG. 1 in a state where the device body 1 is attached to the wall plate 60. As shown in FIG. 4, the accommodating portion 12 in this embodiment is formed of a groove, and the cross-sectional shape in the direction perpendicular to the front surface 21 has a groove shape. Further, the accommodating portion 12 formed of a groove is formed so as to have a stepped portion at least on the side of the housing body 20 higher than the bottom surface 12b of the groove, and the surface of this stepped portion constitutes the contact surface 12a. The substantially U-shaped inner peripheral edges of the divided mounting plates 51 and 52 and their peripheral portions at least abut on the contact body 12 side of the accommodating portion 12, that is, the contact surface 12a which is the inner side surface of the groove on the accommodating body 20 side. Has been done. Thereby, when the apparatus main body 1 is installed in a state where the frame body 10 is exposed to the outside such as an environment where dew condensation occurs, it is possible to suppress the intrusion of moisture from the outside into the storage main body 20 side.

In addition, as shown in FIGS. 2 and 4, the substantially U-shaped inner peripheral portions of the split mounting plates 51 and 52 are formed so as to substantially match the shape of the bottom surface 12b of the groove which is the outer peripheral portion of the groove-shaped accommodating portion 12. Is formed in. As a result, the inner peripheral edges of the split mounting plates 51, 52 are brought into close contact with the inside of the accommodating portion 12, and the inner peripheral edges of the split mounting plates 51, 52 are formed on the L-shaped surface formed by the contact surface 12a and the bottom surface 12b. The parts can be abutted. Therefore, even if the frame body 10 is exposed to a high-humidity atmosphere such as the outside of the wall plate 60 that contains a large amount of water or the like, the accommodation section 12 and the mounting plate 50 prevent the infiltration of water up to the inner surface 12c. Water can be prevented from entering the storage body 20 side. Here, the depth d ₀ of the groove-shaped accommodating portion 12 is preferably, for example, 1.0 mm or more and 5.0 mm or less. By setting the depth d ₀ in such a range, the function of the groove-shaped accommodating portion 12 can be made effective even if the processing accuracy of the frame body 10 and the split mounting plates 51, 52 is poor. In addition, in FIG. 4, the accommodating portion 12 has a groove shape and the mounting plate 50 is in contact with the inner side surface 12c. However, the shape is not necessarily limited to the groove shape, and the portion of the inner side surface 12c also contacts the mounting plate 50. You don't have to touch them.

  5 and 6 are side views of the apparatus main body 1 viewed from the lower surface 24 side, showing a state in which the split mounting plates 51 and 52 are attached to the connection portion between the storage main body 20 and the frame body 10, respectively.

  As shown in FIGS. 5 and 6, when the mounting plate 50 is mounted on the connecting portion between the frame body 10 and the storage body 20, the upper surfaces 50S of the split mounting plates 51 and 52 are in contact with the housing portion 12. It is fitted into the housing portion 12 formed of a groove so as to be in close contact with the surface 12a. At this time, as shown in FIGS. 2 and 5, a flat end surface 51e perpendicular to the longitudinal direction of the split mounting plate 51 at the end of the substantially U-shaped split mounting plate 51 and a similar end surface of the split mounting plate 52. The split mounting plates 51 and 52 are fitted into the accommodation portion 12 so that the mounting attachment plates 52 and 52e face each other. Then, the end faces 51e, 52e are brought into close contact with each other by face-to-face contact with each other in a facing state, so that the split mounting plates 51, 52 can be brought into close contact with each other without any gap. If necessary, an adhesive or the like may be introduced between the end surfaces 51e and 52e or laser bonding may be performed between the end surfaces 51e and 52e in order to strongly adhere the end surfaces 51e and 52e to each other. In addition, in this embodiment, the surface shapes of the end surfaces 51e and 52e are flat, but the surface shapes of the end surfaces 51e and 52e may be uneven so as to complement each other.

  As a result, as shown in FIGS. 1 and 6, in the state where the mounting plate 50 is fixed to the storage body 20, the divided mounting plates 51 and 52 are mutually end faces 51e and 52e at the close contact portion 50a. Are brought into close contact with each other in a surface contact state. According to this configuration, in order to connect the split mounting plates 51 and 52 to each other, the split mounting plates 51 and 52 as described in Patent Document 1 are provided in the vicinity of the close contact portion 50a of the split mounting plates 51 and 52. It is not necessary to provide a portion in which the ends of the are bent in the plate thickness direction and overlap each other. Therefore, it is possible to prevent the occurrence of a gap caused by bending the end portions of the split mounting plates 51, 52, so that it is possible to extremely reduce the possibility that water will enter from the frame body 10 side to the storage body 20 side through the gap. .

  FIG. 7 is a perspective view of the area Q in FIG. 2 viewed from the frame body 10 side. As shown in FIGS. 2 and 7, notches 20a, 20b, 20c, 20d are formed in the connecting portion of the storage body 20 with the frame body 10. These cutout portions 20 a to 20 d are provided at positions adjacent to the housing portion 12. Further, in this embodiment, the outer peripheral shape of the peripheral portion of the accommodating portion 12 along the right side surface 22, the lower surface 24 side, the left side surface 23 side, and the upper surface 25 side of the storage body 20 is the cutout portion 20a. At the formation positions of ˜20d, the four corners of the rectangle are recessed into a rectangular shape.

  On the other hand, as shown in FIG. 2, in the substantially U-shaped inner peripheral portions of the split mounting plates 51 and 52, the inner portions are bent inward at the bent portions corresponding to the cutout portions 20a to 20d so as to follow the outer peripheral shape of the accommodating portion 12. A protruding rectangular portion is provided. Engaging holes 51c and 51d are formed in the rectangular portion projecting inward of the split mounting plate 51. Engagement holes 52c and 52d are similarly formed in the rectangular portion protruding inward of the split mounting plate 52.

  FIG. 8 is a perspective view of the region R in FIG. 1 viewed from the storage body 20 side. As shown in FIGS. 1 and 8, the positions of the notches 20a and 20d of the storage main body 20 and the positions of the engaging holes 51c and 51d of the split mounting plate 51 are adjusted to each other by mounting screws or the like. By penetrating, the split mounting plate 51 can be screwed and fixed to the storage body 20. Similarly, the cutout portions 20b and 20c of the storage main body 20 and the engagement holes 52c and 52d of the split mounting plate 52 are pierced by a mounting screw or the like in a state of being aligned with each other, whereby the storage main body 20 is divided. The mounting plate 52 can be screwed and fixed. As a result, the mounting plate 50 including the split mounting plates 51 and 52 can be fixed to the housing portion 12 at the connecting portion between the housing body 20 and the frame body 10. In this way, by fixing the mounting plate 50 to the storage body 20 with mounting screws or the like, the inner periphery of the upper surface 50S of the mounting plate 50 with respect to the contact surface 12a of the storage portion 12 on the storage body 20 side. The parts can be pressed together. Therefore, it is possible to suppress the occurrence of a gap between the housing portion 12 and the mounting plate 50, and it is possible to sufficiently secure the installation strength of the mounting plate 50 with respect to the apparatus body 1.

  As shown in FIG. 2, the split mounting plate 51 is provided with mounting holes 51a and 51b for mounting the power conversion device on a wall plate 60 such as a board. Similarly, the split mounting plate 52 also has mounting holes 52a and 52b. As a result, as shown in FIG. 3, the mounting screws (not shown) are passed through the respective mounting holes 51a, 51b, 52a, 52b of the divided mounting plates 51, 52 constituting the mounting plate 50, and the wall plate 60 is formed. The device main body 1 can be installed so that the frame body 10 is external to the wall plate 60 by screwing the main body 1 into the wall plate 60.

  In addition, a holder portion 21a as a first operation panel holding portion is formed on the front surface 21. The holder portion 21a is configured such that an operation panel 30 as an operation means can be detachably attached and held. When the operation panel 30 is detached from the holder portion 21a, the operation panel 30 can be used to operate the apparatus body 1 by using the extension cable for remote operation.

Further, as shown in FIG. 1 and FIG. 2, two vent holes are provided: an intake port 22a for supplying the outside air into the storage body 20 and an exhaust port 22b for discharging the inside air of the storage body 20 to the outside. ing. Then, the outside air taken in as shown by the arrow B ₀ is exhausted from the exhaust port 22b as shown by the arrow B. Further, an intake fan 26 is provided inside the storage body 20 in the vicinity of the intake port 22a, and by the rotation of the intake fan 26, outside air can be forcibly supplied and introduced into the storage body 20. Furthermore, since the intake and exhaust air inside the storage body 20 is in a different direction from the exhaust air from the top surface of the frame body 10, the hot air exhausted from the top surface of the frame body 10 is prevented from flowing back into the storage body 20. it can.

  Further, in this one embodiment, the lower surface 24 and the upper surface 25 are not provided with vent holes. As a result, the outside air taken in through the intake port 22a of the right side surface 22 evenly passes through the inside of the storage main body 20 by thermal convection, and radiates and cools the control device inside the storage main body 20. Since the lower surface 24 of the storage body 20 is not provided with the vent hole, the outside air taken in by the intake fan 26 escapes downward without radiating heat to the control device, and the inside of the storage body 20 is not cooled. There is no problem. On the other hand, since the upper surface 25 is not provided with the ventilation hole, it is possible to prevent dust such as dust from entering the inside of the storage body 20 from above the storage body 20, and to prevent a failure in the control device of the storage body 20 due to the dust. Occurrence can be suppressed.

(Modification)
Next, a modified example of the above-described embodiment will be described. FIG. 9 is a partial cross-sectional view showing this modification. In the device body 2 of the power conversion device according to this modification, the housing portion 13 is formed in a stepped shape having a portion that is high on the housing body 20 side and has an L-shaped cross section. That is, the abutting surface of the housing portion 13 is composed of the side surface of the step in which the housing body 20 projects from the frame body 10. The size d ₁ of the step of the accommodating portion 13 is preferably 1.0 mm or more and 5.0 mm or less. By setting the step size d ₁ in such a range, the function of the groove-shaped accommodating portion 12 can be made effective even if the processing accuracy of the frame body 10 and the mounting plate 50 is poor. Accordingly, even if the frame body 10 is exposed to a high-humidity atmosphere containing a large amount of water or the like, the housing portion 13 and the mounting plate 50 can prevent the water from entering the housing body 20 side. The other configurations are similar to those of the above-described embodiment, and thus description thereof will be omitted.

  According to the embodiment of the present invention described above, even when the apparatus body 1 is installed so that the frame body 10 is exposed to an environment with a large amount of moisture, moisture is not supplied to the storage body 20 side from the outside. Can be prevented, the reliability of the power conversion device can be improved, and the influence of heat on the circuit portion of the device main body 1 due to heat dissipation of the frame body 10 can be suppressed.

  Although one embodiment of the present invention has been specifically described above, the present invention is not limited to the above-described one embodiment, and various modifications based on the technical idea of the present invention are possible. For example, the structures of the storage main body 20 and the frame body 10 described in the above-described embodiment are merely examples, and different structures of the storage main body and the frame body may be used if necessary.

  Further, in the above-described embodiment, the shape of the plate members of the split mounting plates 51 and 52 is U-shaped, but the shape of the plate members of the split mounting plates 51 and 52 is not limited to the U shape. It is also possible to have a J-shape or V-shape having abutting portions that can be in close contact with each other.

  Further, in the above-described embodiment, the notch portions 20a to 20d for screwing the mounting plate 50 are formed at the connection portion of the storage main body 20 with the frame body 10, but the storage main body 20 side is not necessarily required. The present invention is not limited to the above-described configuration, and a cutout portion for screwing the attachment plate 50 may be formed in the connection portion of the frame body 10 with the storage body 20. That is, as long as the mounting plate 50 is fixed to the apparatus main body 1 by screwing, various forms can be adopted. Further, screw holes may be used instead of the cutout portions 20a to 20d.

1, 2 Device body 10 Frame body 12, 13 Housing portion 12a Abutment surface 12b Bottom surface 12c Inner side surface 20 Storage body 20a, 20b, 20c, 20d, 41a, 41b, 42a, 42b Notch portion 21 Front surface 21a Holder portion 22 Right side Surface 22a Inlet port 22b Exhaust port 23 Left side surface 24 Lower surface 25, 50S Upper surface 26 Intake fan 30 Operation panel 43a, 43b, 44a, 44b, 51a, 51b, 52a, 52b Mounting hole 50 Mounting plate 50a Close contact part 51, 52 Split mounting Plates 51c, 51d, 52c, 52d Engagement holes 51e, 52e End face 60 Wall plate

Claims (6)

A storage body in which a semiconductor element that constitutes a power conversion circuit is stored,
A frame body mounted on the rear surface of the storage body and storing a cooling body of the semiconductor element,
A mounting plate made up of a plurality of split mounting plates mounted on a connecting portion between the frame body and the storage body;
A power conversion device installed on the mounting wall via the mounting plate in a state in which the frame body is exposed to the outside from an opening formed in the mounting wall,
At a connecting portion between the frame body and the storage body, a storage portion having a contact surface facing the mounting wall is provided circumferentially,
The mounting plate is in contact with the contact surface in the accommodating portion, and is fixed by screwing to the accommodating body ,
It said abutment surface, the power converter, wherein the Ru side der on the inside of the formed connecting portion groove. The power conversion device according to claim 1, wherein each of the plurality of divided mounting plates is provided with a mounting hole configured to be screwed into the mounting wall by screwing. The power conversion device according to claim 1 or 2 , wherein a depth of the contact surface portion of the accommodation portion is 1.0 mm or more and 5.0 mm or less. A flat end surface at the end of one of the plurality of split mounting plates and a flat end surface at the end of the other split mounting plate of the plurality of split mounting plates are mutually The power conversion device according to any one of claims 1 to 4 , wherein the power conversion device is fitted in the housing portion so as to be in close contact with each other in a face-to-face state by surface contact. An intake port for supplying outside air to the inside of the storage body and an exhaust port for discharging the inside air of the storage body to the outside are provided only on one side surface of the storage body. power converter according to any one of claims 1-4. The frame body has been sucked from the lower surface outside air, power converter according to any one of claims 1 to 5, characterized in that it is configured to be exhausted on the upper surface side.

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